| 1 | /* |
| 2 | md.c : Multiple Devices driver for Linux |
| 3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar |
| 4 | |
| 5 | completely rewritten, based on the MD driver code from Marc Zyngier |
| 6 | |
| 7 | Changes: |
| 8 | |
| 9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar |
| 10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> |
| 11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> |
| 12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> |
| 13 | - kmod support by: Cyrus Durgin |
| 14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> |
| 15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> |
| 16 | |
| 17 | - lots of fixes and improvements to the RAID1/RAID5 and generic |
| 18 | RAID code (such as request based resynchronization): |
| 19 | |
| 20 | Neil Brown <neilb@cse.unsw.edu.au>. |
| 21 | |
| 22 | - persistent bitmap code |
| 23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. |
| 24 | |
| 25 | This program is free software; you can redistribute it and/or modify |
| 26 | it under the terms of the GNU General Public License as published by |
| 27 | the Free Software Foundation; either version 2, or (at your option) |
| 28 | any later version. |
| 29 | |
| 30 | You should have received a copy of the GNU General Public License |
| 31 | (for example /usr/src/linux/COPYING); if not, write to the Free |
| 32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 33 | |
| 34 | Errors, Warnings, etc. |
| 35 | Please use: |
| 36 | pr_crit() for error conditions that risk data loss |
| 37 | pr_err() for error conditions that are unexpected, like an IO error |
| 38 | or internal inconsistency |
| 39 | pr_warn() for error conditions that could have been predicated, like |
| 40 | adding a device to an array when it has incompatible metadata |
| 41 | pr_info() for every interesting, very rare events, like an array starting |
| 42 | or stopping, or resync starting or stopping |
| 43 | pr_debug() for everything else. |
| 44 | |
| 45 | */ |
| 46 | |
| 47 | #include <linux/sched/signal.h> |
| 48 | #include <linux/kthread.h> |
| 49 | #include <linux/blkdev.h> |
| 50 | #include <linux/badblocks.h> |
| 51 | #include <linux/sysctl.h> |
| 52 | #include <linux/seq_file.h> |
| 53 | #include <linux/fs.h> |
| 54 | #include <linux/poll.h> |
| 55 | #include <linux/ctype.h> |
| 56 | #include <linux/string.h> |
| 57 | #include <linux/hdreg.h> |
| 58 | #include <linux/proc_fs.h> |
| 59 | #include <linux/random.h> |
| 60 | #include <linux/module.h> |
| 61 | #include <linux/reboot.h> |
| 62 | #include <linux/file.h> |
| 63 | #include <linux/compat.h> |
| 64 | #include <linux/delay.h> |
| 65 | #include <linux/raid/md_p.h> |
| 66 | #include <linux/raid/md_u.h> |
| 67 | #include <linux/slab.h> |
| 68 | #include <linux/percpu-refcount.h> |
| 69 | |
| 70 | #include <trace/events/block.h> |
| 71 | #include "md.h" |
| 72 | #include "md-bitmap.h" |
| 73 | #include "md-cluster.h" |
| 74 | |
| 75 | #ifndef MODULE |
| 76 | static void autostart_arrays(int part); |
| 77 | #endif |
| 78 | |
| 79 | /* pers_list is a list of registered personalities protected |
| 80 | * by pers_lock. |
| 81 | * pers_lock does extra service to protect accesses to |
| 82 | * mddev->thread when the mutex cannot be held. |
| 83 | */ |
| 84 | static LIST_HEAD(pers_list); |
| 85 | static DEFINE_SPINLOCK(pers_lock); |
| 86 | |
| 87 | static struct kobj_type md_ktype; |
| 88 | |
| 89 | struct md_cluster_operations *md_cluster_ops; |
| 90 | EXPORT_SYMBOL(md_cluster_ops); |
| 91 | struct module *md_cluster_mod; |
| 92 | EXPORT_SYMBOL(md_cluster_mod); |
| 93 | |
| 94 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
| 95 | static struct workqueue_struct *md_wq; |
| 96 | static struct workqueue_struct *md_misc_wq; |
| 97 | |
| 98 | static int remove_and_add_spares(struct mddev *mddev, |
| 99 | struct md_rdev *this); |
| 100 | static void mddev_detach(struct mddev *mddev); |
| 101 | |
| 102 | /* |
| 103 | * Default number of read corrections we'll attempt on an rdev |
| 104 | * before ejecting it from the array. We divide the read error |
| 105 | * count by 2 for every hour elapsed between read errors. |
| 106 | */ |
| 107 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 |
| 108 | /* |
| 109 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' |
| 110 | * is 1000 KB/sec, so the extra system load does not show up that much. |
| 111 | * Increase it if you want to have more _guaranteed_ speed. Note that |
| 112 | * the RAID driver will use the maximum available bandwidth if the IO |
| 113 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
| 114 | * speed limit - in case reconstruction slows down your system despite |
| 115 | * idle IO detection. |
| 116 | * |
| 117 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. |
| 118 | * or /sys/block/mdX/md/sync_speed_{min,max} |
| 119 | */ |
| 120 | |
| 121 | static int sysctl_speed_limit_min = 1000; |
| 122 | static int sysctl_speed_limit_max = 200000; |
| 123 | static inline int speed_min(struct mddev *mddev) |
| 124 | { |
| 125 | return mddev->sync_speed_min ? |
| 126 | mddev->sync_speed_min : sysctl_speed_limit_min; |
| 127 | } |
| 128 | |
| 129 | static inline int speed_max(struct mddev *mddev) |
| 130 | { |
| 131 | return mddev->sync_speed_max ? |
| 132 | mddev->sync_speed_max : sysctl_speed_limit_max; |
| 133 | } |
| 134 | |
| 135 | static void * flush_info_alloc(gfp_t gfp_flags, void *data) |
| 136 | { |
| 137 | return kzalloc(sizeof(struct flush_info), gfp_flags); |
| 138 | } |
| 139 | static void flush_info_free(void *flush_info, void *data) |
| 140 | { |
| 141 | kfree(flush_info); |
| 142 | } |
| 143 | |
| 144 | static void * flush_bio_alloc(gfp_t gfp_flags, void *data) |
| 145 | { |
| 146 | return kzalloc(sizeof(struct flush_bio), gfp_flags); |
| 147 | } |
| 148 | static void flush_bio_free(void *flush_bio, void *data) |
| 149 | { |
| 150 | kfree(flush_bio); |
| 151 | } |
| 152 | |
| 153 | static struct ctl_table_header *raid_table_header; |
| 154 | |
| 155 | static struct ctl_table raid_table[] = { |
| 156 | { |
| 157 | .procname = "speed_limit_min", |
| 158 | .data = &sysctl_speed_limit_min, |
| 159 | .maxlen = sizeof(int), |
| 160 | .mode = S_IRUGO|S_IWUSR, |
| 161 | .proc_handler = proc_dointvec, |
| 162 | }, |
| 163 | { |
| 164 | .procname = "speed_limit_max", |
| 165 | .data = &sysctl_speed_limit_max, |
| 166 | .maxlen = sizeof(int), |
| 167 | .mode = S_IRUGO|S_IWUSR, |
| 168 | .proc_handler = proc_dointvec, |
| 169 | }, |
| 170 | { } |
| 171 | }; |
| 172 | |
| 173 | static struct ctl_table raid_dir_table[] = { |
| 174 | { |
| 175 | .procname = "raid", |
| 176 | .maxlen = 0, |
| 177 | .mode = S_IRUGO|S_IXUGO, |
| 178 | .child = raid_table, |
| 179 | }, |
| 180 | { } |
| 181 | }; |
| 182 | |
| 183 | static struct ctl_table raid_root_table[] = { |
| 184 | { |
| 185 | .procname = "dev", |
| 186 | .maxlen = 0, |
| 187 | .mode = 0555, |
| 188 | .child = raid_dir_table, |
| 189 | }, |
| 190 | { } |
| 191 | }; |
| 192 | |
| 193 | static const struct block_device_operations md_fops; |
| 194 | |
| 195 | static int start_readonly; |
| 196 | |
| 197 | /* |
| 198 | * The original mechanism for creating an md device is to create |
| 199 | * a device node in /dev and to open it. This causes races with device-close. |
| 200 | * The preferred method is to write to the "new_array" module parameter. |
| 201 | * This can avoid races. |
| 202 | * Setting create_on_open to false disables the original mechanism |
| 203 | * so all the races disappear. |
| 204 | */ |
| 205 | static bool create_on_open = true; |
| 206 | |
| 207 | /* bio_clone_mddev |
| 208 | * like bio_clone_bioset, but with a local bio set |
| 209 | */ |
| 210 | |
| 211 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
| 212 | struct mddev *mddev) |
| 213 | { |
| 214 | struct bio *b; |
| 215 | |
| 216 | if (!mddev || !bioset_initialized(&mddev->bio_set)) |
| 217 | return bio_alloc(gfp_mask, nr_iovecs); |
| 218 | |
| 219 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set); |
| 220 | if (!b) |
| 221 | return NULL; |
| 222 | return b; |
| 223 | } |
| 224 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); |
| 225 | |
| 226 | static struct bio *md_bio_alloc_sync(struct mddev *mddev) |
| 227 | { |
| 228 | if (!mddev || !bioset_initialized(&mddev->sync_set)) |
| 229 | return bio_alloc(GFP_NOIO, 1); |
| 230 | |
| 231 | return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set); |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * We have a system wide 'event count' that is incremented |
| 236 | * on any 'interesting' event, and readers of /proc/mdstat |
| 237 | * can use 'poll' or 'select' to find out when the event |
| 238 | * count increases. |
| 239 | * |
| 240 | * Events are: |
| 241 | * start array, stop array, error, add device, remove device, |
| 242 | * start build, activate spare |
| 243 | */ |
| 244 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
| 245 | static atomic_t md_event_count; |
| 246 | void md_new_event(struct mddev *mddev) |
| 247 | { |
| 248 | atomic_inc(&md_event_count); |
| 249 | wake_up(&md_event_waiters); |
| 250 | } |
| 251 | EXPORT_SYMBOL_GPL(md_new_event); |
| 252 | |
| 253 | /* |
| 254 | * Enables to iterate over all existing md arrays |
| 255 | * all_mddevs_lock protects this list. |
| 256 | */ |
| 257 | static LIST_HEAD(all_mddevs); |
| 258 | static DEFINE_SPINLOCK(all_mddevs_lock); |
| 259 | |
| 260 | /* |
| 261 | * iterates through all used mddevs in the system. |
| 262 | * We take care to grab the all_mddevs_lock whenever navigating |
| 263 | * the list, and to always hold a refcount when unlocked. |
| 264 | * Any code which breaks out of this loop while own |
| 265 | * a reference to the current mddev and must mddev_put it. |
| 266 | */ |
| 267 | #define for_each_mddev(_mddev,_tmp) \ |
| 268 | \ |
| 269 | for (({ spin_lock(&all_mddevs_lock); \ |
| 270 | _tmp = all_mddevs.next; \ |
| 271 | _mddev = NULL;}); \ |
| 272 | ({ if (_tmp != &all_mddevs) \ |
| 273 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ |
| 274 | spin_unlock(&all_mddevs_lock); \ |
| 275 | if (_mddev) mddev_put(_mddev); \ |
| 276 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ |
| 277 | _tmp != &all_mddevs;}); \ |
| 278 | ({ spin_lock(&all_mddevs_lock); \ |
| 279 | _tmp = _tmp->next;}) \ |
| 280 | ) |
| 281 | |
| 282 | /* Rather than calling directly into the personality make_request function, |
| 283 | * IO requests come here first so that we can check if the device is |
| 284 | * being suspended pending a reconfiguration. |
| 285 | * We hold a refcount over the call to ->make_request. By the time that |
| 286 | * call has finished, the bio has been linked into some internal structure |
| 287 | * and so is visible to ->quiesce(), so we don't need the refcount any more. |
| 288 | */ |
| 289 | static bool is_suspended(struct mddev *mddev, struct bio *bio) |
| 290 | { |
| 291 | if (mddev->suspended) |
| 292 | return true; |
| 293 | if (bio_data_dir(bio) != WRITE) |
| 294 | return false; |
| 295 | if (mddev->suspend_lo >= mddev->suspend_hi) |
| 296 | return false; |
| 297 | if (bio->bi_iter.bi_sector >= mddev->suspend_hi) |
| 298 | return false; |
| 299 | if (bio_end_sector(bio) < mddev->suspend_lo) |
| 300 | return false; |
| 301 | return true; |
| 302 | } |
| 303 | |
| 304 | void md_handle_request(struct mddev *mddev, struct bio *bio) |
| 305 | { |
| 306 | check_suspended: |
| 307 | rcu_read_lock(); |
| 308 | if (is_suspended(mddev, bio)) { |
| 309 | DEFINE_WAIT(__wait); |
| 310 | for (;;) { |
| 311 | prepare_to_wait(&mddev->sb_wait, &__wait, |
| 312 | TASK_UNINTERRUPTIBLE); |
| 313 | if (!is_suspended(mddev, bio)) |
| 314 | break; |
| 315 | rcu_read_unlock(); |
| 316 | schedule(); |
| 317 | rcu_read_lock(); |
| 318 | } |
| 319 | finish_wait(&mddev->sb_wait, &__wait); |
| 320 | } |
| 321 | atomic_inc(&mddev->active_io); |
| 322 | rcu_read_unlock(); |
| 323 | |
| 324 | if (!mddev->pers->make_request(mddev, bio)) { |
| 325 | atomic_dec(&mddev->active_io); |
| 326 | wake_up(&mddev->sb_wait); |
| 327 | goto check_suspended; |
| 328 | } |
| 329 | |
| 330 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
| 331 | wake_up(&mddev->sb_wait); |
| 332 | } |
| 333 | EXPORT_SYMBOL(md_handle_request); |
| 334 | |
| 335 | static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) |
| 336 | { |
| 337 | const int rw = bio_data_dir(bio); |
| 338 | const int sgrp = op_stat_group(bio_op(bio)); |
| 339 | struct mddev *mddev = q->queuedata; |
| 340 | unsigned int sectors; |
| 341 | int cpu; |
| 342 | |
| 343 | blk_queue_split(q, &bio); |
| 344 | |
| 345 | if (mddev == NULL || mddev->pers == NULL) { |
| 346 | bio_io_error(bio); |
| 347 | return BLK_QC_T_NONE; |
| 348 | } |
| 349 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
| 350 | if (bio_sectors(bio) != 0) |
| 351 | bio->bi_status = BLK_STS_IOERR; |
| 352 | bio_endio(bio); |
| 353 | return BLK_QC_T_NONE; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * save the sectors now since our bio can |
| 358 | * go away inside make_request |
| 359 | */ |
| 360 | sectors = bio_sectors(bio); |
| 361 | /* bio could be mergeable after passing to underlayer */ |
| 362 | bio->bi_opf &= ~REQ_NOMERGE; |
| 363 | |
| 364 | md_handle_request(mddev, bio); |
| 365 | |
| 366 | cpu = part_stat_lock(); |
| 367 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[sgrp]); |
| 368 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[sgrp], sectors); |
| 369 | part_stat_unlock(); |
| 370 | |
| 371 | return BLK_QC_T_NONE; |
| 372 | } |
| 373 | |
| 374 | /* mddev_suspend makes sure no new requests are submitted |
| 375 | * to the device, and that any requests that have been submitted |
| 376 | * are completely handled. |
| 377 | * Once mddev_detach() is called and completes, the module will be |
| 378 | * completely unused. |
| 379 | */ |
| 380 | void mddev_suspend(struct mddev *mddev) |
| 381 | { |
| 382 | WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk); |
| 383 | lockdep_assert_held(&mddev->reconfig_mutex); |
| 384 | if (mddev->suspended++) |
| 385 | return; |
| 386 | synchronize_rcu(); |
| 387 | wake_up(&mddev->sb_wait); |
| 388 | set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags); |
| 389 | smp_mb__after_atomic(); |
| 390 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); |
| 391 | mddev->pers->quiesce(mddev, 1); |
| 392 | clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags); |
| 393 | wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags)); |
| 394 | |
| 395 | del_timer_sync(&mddev->safemode_timer); |
| 396 | } |
| 397 | EXPORT_SYMBOL_GPL(mddev_suspend); |
| 398 | |
| 399 | void mddev_resume(struct mddev *mddev) |
| 400 | { |
| 401 | lockdep_assert_held(&mddev->reconfig_mutex); |
| 402 | if (--mddev->suspended) |
| 403 | return; |
| 404 | wake_up(&mddev->sb_wait); |
| 405 | mddev->pers->quiesce(mddev, 0); |
| 406 | |
| 407 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 408 | md_wakeup_thread(mddev->thread); |
| 409 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ |
| 410 | } |
| 411 | EXPORT_SYMBOL_GPL(mddev_resume); |
| 412 | |
| 413 | int mddev_congested(struct mddev *mddev, int bits) |
| 414 | { |
| 415 | struct md_personality *pers = mddev->pers; |
| 416 | int ret = 0; |
| 417 | |
| 418 | rcu_read_lock(); |
| 419 | if (mddev->suspended) |
| 420 | ret = 1; |
| 421 | else if (pers && pers->congested) |
| 422 | ret = pers->congested(mddev, bits); |
| 423 | rcu_read_unlock(); |
| 424 | return ret; |
| 425 | } |
| 426 | EXPORT_SYMBOL_GPL(mddev_congested); |
| 427 | static int md_congested(void *data, int bits) |
| 428 | { |
| 429 | struct mddev *mddev = data; |
| 430 | return mddev_congested(mddev, bits); |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * Generic flush handling for md |
| 435 | */ |
| 436 | static void submit_flushes(struct work_struct *ws) |
| 437 | { |
| 438 | struct flush_info *fi = container_of(ws, struct flush_info, flush_work); |
| 439 | struct mddev *mddev = fi->mddev; |
| 440 | struct bio *bio = fi->bio; |
| 441 | |
| 442 | bio->bi_opf &= ~REQ_PREFLUSH; |
| 443 | md_handle_request(mddev, bio); |
| 444 | |
| 445 | mempool_free(fi, mddev->flush_pool); |
| 446 | } |
| 447 | |
| 448 | static void md_end_flush(struct bio *fbio) |
| 449 | { |
| 450 | struct flush_bio *fb = fbio->bi_private; |
| 451 | struct md_rdev *rdev = fb->rdev; |
| 452 | struct flush_info *fi = fb->fi; |
| 453 | struct bio *bio = fi->bio; |
| 454 | struct mddev *mddev = fi->mddev; |
| 455 | |
| 456 | rdev_dec_pending(rdev, mddev); |
| 457 | |
| 458 | if (atomic_dec_and_test(&fi->flush_pending)) { |
| 459 | if (bio->bi_iter.bi_size == 0) |
| 460 | /* an empty barrier - all done */ |
| 461 | bio_endio(bio); |
| 462 | else { |
| 463 | INIT_WORK(&fi->flush_work, submit_flushes); |
| 464 | queue_work(md_wq, &fi->flush_work); |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | mempool_free(fb, mddev->flush_bio_pool); |
| 469 | bio_put(fbio); |
| 470 | } |
| 471 | |
| 472 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
| 473 | { |
| 474 | struct md_rdev *rdev; |
| 475 | struct flush_info *fi; |
| 476 | |
| 477 | fi = mempool_alloc(mddev->flush_pool, GFP_NOIO); |
| 478 | |
| 479 | fi->bio = bio; |
| 480 | fi->mddev = mddev; |
| 481 | atomic_set(&fi->flush_pending, 1); |
| 482 | |
| 483 | rcu_read_lock(); |
| 484 | rdev_for_each_rcu(rdev, mddev) |
| 485 | if (rdev->raid_disk >= 0 && |
| 486 | !test_bit(Faulty, &rdev->flags)) { |
| 487 | /* Take two references, one is dropped |
| 488 | * when request finishes, one after |
| 489 | * we reclaim rcu_read_lock |
| 490 | */ |
| 491 | struct bio *bi; |
| 492 | struct flush_bio *fb; |
| 493 | atomic_inc(&rdev->nr_pending); |
| 494 | atomic_inc(&rdev->nr_pending); |
| 495 | rcu_read_unlock(); |
| 496 | |
| 497 | fb = mempool_alloc(mddev->flush_bio_pool, GFP_NOIO); |
| 498 | fb->fi = fi; |
| 499 | fb->rdev = rdev; |
| 500 | |
| 501 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
| 502 | bio_set_dev(bi, rdev->bdev); |
| 503 | bi->bi_end_io = md_end_flush; |
| 504 | bi->bi_private = fb; |
| 505 | bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
| 506 | |
| 507 | atomic_inc(&fi->flush_pending); |
| 508 | submit_bio(bi); |
| 509 | |
| 510 | rcu_read_lock(); |
| 511 | rdev_dec_pending(rdev, mddev); |
| 512 | } |
| 513 | rcu_read_unlock(); |
| 514 | |
| 515 | if (atomic_dec_and_test(&fi->flush_pending)) { |
| 516 | if (bio->bi_iter.bi_size == 0) |
| 517 | /* an empty barrier - all done */ |
| 518 | bio_endio(bio); |
| 519 | else { |
| 520 | INIT_WORK(&fi->flush_work, submit_flushes); |
| 521 | queue_work(md_wq, &fi->flush_work); |
| 522 | } |
| 523 | } |
| 524 | } |
| 525 | EXPORT_SYMBOL(md_flush_request); |
| 526 | |
| 527 | static inline struct mddev *mddev_get(struct mddev *mddev) |
| 528 | { |
| 529 | atomic_inc(&mddev->active); |
| 530 | return mddev; |
| 531 | } |
| 532 | |
| 533 | static void mddev_delayed_delete(struct work_struct *ws); |
| 534 | |
| 535 | static void mddev_put(struct mddev *mddev) |
| 536 | { |
| 537 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
| 538 | return; |
| 539 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
| 540 | mddev->ctime == 0 && !mddev->hold_active) { |
| 541 | /* Array is not configured at all, and not held active, |
| 542 | * so destroy it */ |
| 543 | list_del_init(&mddev->all_mddevs); |
| 544 | |
| 545 | /* |
| 546 | * Call queue_work inside the spinlock so that |
| 547 | * flush_workqueue() after mddev_find will succeed in waiting |
| 548 | * for the work to be done. |
| 549 | */ |
| 550 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); |
| 551 | queue_work(md_misc_wq, &mddev->del_work); |
| 552 | } |
| 553 | spin_unlock(&all_mddevs_lock); |
| 554 | } |
| 555 | |
| 556 | static void md_safemode_timeout(struct timer_list *t); |
| 557 | |
| 558 | void mddev_init(struct mddev *mddev) |
| 559 | { |
| 560 | kobject_init(&mddev->kobj, &md_ktype); |
| 561 | mutex_init(&mddev->open_mutex); |
| 562 | mutex_init(&mddev->reconfig_mutex); |
| 563 | mutex_init(&mddev->bitmap_info.mutex); |
| 564 | INIT_LIST_HEAD(&mddev->disks); |
| 565 | INIT_LIST_HEAD(&mddev->all_mddevs); |
| 566 | timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0); |
| 567 | atomic_set(&mddev->active, 1); |
| 568 | atomic_set(&mddev->openers, 0); |
| 569 | atomic_set(&mddev->active_io, 0); |
| 570 | spin_lock_init(&mddev->lock); |
| 571 | init_waitqueue_head(&mddev->sb_wait); |
| 572 | init_waitqueue_head(&mddev->recovery_wait); |
| 573 | mddev->reshape_position = MaxSector; |
| 574 | mddev->reshape_backwards = 0; |
| 575 | mddev->last_sync_action = "none"; |
| 576 | mddev->resync_min = 0; |
| 577 | mddev->resync_max = MaxSector; |
| 578 | mddev->level = LEVEL_NONE; |
| 579 | } |
| 580 | EXPORT_SYMBOL_GPL(mddev_init); |
| 581 | |
| 582 | static struct mddev *mddev_find(dev_t unit) |
| 583 | { |
| 584 | struct mddev *mddev, *new = NULL; |
| 585 | |
| 586 | if (unit && MAJOR(unit) != MD_MAJOR) |
| 587 | unit &= ~((1<<MdpMinorShift)-1); |
| 588 | |
| 589 | retry: |
| 590 | spin_lock(&all_mddevs_lock); |
| 591 | |
| 592 | if (unit) { |
| 593 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) |
| 594 | if (mddev->unit == unit) { |
| 595 | mddev_get(mddev); |
| 596 | spin_unlock(&all_mddevs_lock); |
| 597 | kfree(new); |
| 598 | return mddev; |
| 599 | } |
| 600 | |
| 601 | if (new) { |
| 602 | list_add(&new->all_mddevs, &all_mddevs); |
| 603 | spin_unlock(&all_mddevs_lock); |
| 604 | new->hold_active = UNTIL_IOCTL; |
| 605 | return new; |
| 606 | } |
| 607 | } else if (new) { |
| 608 | /* find an unused unit number */ |
| 609 | static int next_minor = 512; |
| 610 | int start = next_minor; |
| 611 | int is_free = 0; |
| 612 | int dev = 0; |
| 613 | while (!is_free) { |
| 614 | dev = MKDEV(MD_MAJOR, next_minor); |
| 615 | next_minor++; |
| 616 | if (next_minor > MINORMASK) |
| 617 | next_minor = 0; |
| 618 | if (next_minor == start) { |
| 619 | /* Oh dear, all in use. */ |
| 620 | spin_unlock(&all_mddevs_lock); |
| 621 | kfree(new); |
| 622 | return NULL; |
| 623 | } |
| 624 | |
| 625 | is_free = 1; |
| 626 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) |
| 627 | if (mddev->unit == dev) { |
| 628 | is_free = 0; |
| 629 | break; |
| 630 | } |
| 631 | } |
| 632 | new->unit = dev; |
| 633 | new->md_minor = MINOR(dev); |
| 634 | new->hold_active = UNTIL_STOP; |
| 635 | list_add(&new->all_mddevs, &all_mddevs); |
| 636 | spin_unlock(&all_mddevs_lock); |
| 637 | return new; |
| 638 | } |
| 639 | spin_unlock(&all_mddevs_lock); |
| 640 | |
| 641 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
| 642 | if (!new) |
| 643 | return NULL; |
| 644 | |
| 645 | new->unit = unit; |
| 646 | if (MAJOR(unit) == MD_MAJOR) |
| 647 | new->md_minor = MINOR(unit); |
| 648 | else |
| 649 | new->md_minor = MINOR(unit) >> MdpMinorShift; |
| 650 | |
| 651 | mddev_init(new); |
| 652 | |
| 653 | goto retry; |
| 654 | } |
| 655 | |
| 656 | static struct attribute_group md_redundancy_group; |
| 657 | |
| 658 | void mddev_unlock(struct mddev *mddev) |
| 659 | { |
| 660 | if (mddev->to_remove) { |
| 661 | /* These cannot be removed under reconfig_mutex as |
| 662 | * an access to the files will try to take reconfig_mutex |
| 663 | * while holding the file unremovable, which leads to |
| 664 | * a deadlock. |
| 665 | * So hold set sysfs_active while the remove in happeing, |
| 666 | * and anything else which might set ->to_remove or my |
| 667 | * otherwise change the sysfs namespace will fail with |
| 668 | * -EBUSY if sysfs_active is still set. |
| 669 | * We set sysfs_active under reconfig_mutex and elsewhere |
| 670 | * test it under the same mutex to ensure its correct value |
| 671 | * is seen. |
| 672 | */ |
| 673 | struct attribute_group *to_remove = mddev->to_remove; |
| 674 | mddev->to_remove = NULL; |
| 675 | mddev->sysfs_active = 1; |
| 676 | mutex_unlock(&mddev->reconfig_mutex); |
| 677 | |
| 678 | if (mddev->kobj.sd) { |
| 679 | if (to_remove != &md_redundancy_group) |
| 680 | sysfs_remove_group(&mddev->kobj, to_remove); |
| 681 | if (mddev->pers == NULL || |
| 682 | mddev->pers->sync_request == NULL) { |
| 683 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
| 684 | if (mddev->sysfs_action) |
| 685 | sysfs_put(mddev->sysfs_action); |
| 686 | mddev->sysfs_action = NULL; |
| 687 | } |
| 688 | } |
| 689 | mddev->sysfs_active = 0; |
| 690 | } else |
| 691 | mutex_unlock(&mddev->reconfig_mutex); |
| 692 | |
| 693 | /* As we've dropped the mutex we need a spinlock to |
| 694 | * make sure the thread doesn't disappear |
| 695 | */ |
| 696 | spin_lock(&pers_lock); |
| 697 | md_wakeup_thread(mddev->thread); |
| 698 | wake_up(&mddev->sb_wait); |
| 699 | spin_unlock(&pers_lock); |
| 700 | } |
| 701 | EXPORT_SYMBOL_GPL(mddev_unlock); |
| 702 | |
| 703 | struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) |
| 704 | { |
| 705 | struct md_rdev *rdev; |
| 706 | |
| 707 | rdev_for_each_rcu(rdev, mddev) |
| 708 | if (rdev->desc_nr == nr) |
| 709 | return rdev; |
| 710 | |
| 711 | return NULL; |
| 712 | } |
| 713 | EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); |
| 714 | |
| 715 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) |
| 716 | { |
| 717 | struct md_rdev *rdev; |
| 718 | |
| 719 | rdev_for_each(rdev, mddev) |
| 720 | if (rdev->bdev->bd_dev == dev) |
| 721 | return rdev; |
| 722 | |
| 723 | return NULL; |
| 724 | } |
| 725 | |
| 726 | struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev) |
| 727 | { |
| 728 | struct md_rdev *rdev; |
| 729 | |
| 730 | rdev_for_each_rcu(rdev, mddev) |
| 731 | if (rdev->bdev->bd_dev == dev) |
| 732 | return rdev; |
| 733 | |
| 734 | return NULL; |
| 735 | } |
| 736 | EXPORT_SYMBOL_GPL(md_find_rdev_rcu); |
| 737 | |
| 738 | static struct md_personality *find_pers(int level, char *clevel) |
| 739 | { |
| 740 | struct md_personality *pers; |
| 741 | list_for_each_entry(pers, &pers_list, list) { |
| 742 | if (level != LEVEL_NONE && pers->level == level) |
| 743 | return pers; |
| 744 | if (strcmp(pers->name, clevel)==0) |
| 745 | return pers; |
| 746 | } |
| 747 | return NULL; |
| 748 | } |
| 749 | |
| 750 | /* return the offset of the super block in 512byte sectors */ |
| 751 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
| 752 | { |
| 753 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
| 754 | return MD_NEW_SIZE_SECTORS(num_sectors); |
| 755 | } |
| 756 | |
| 757 | static int alloc_disk_sb(struct md_rdev *rdev) |
| 758 | { |
| 759 | rdev->sb_page = alloc_page(GFP_KERNEL); |
| 760 | if (!rdev->sb_page) |
| 761 | return -ENOMEM; |
| 762 | return 0; |
| 763 | } |
| 764 | |
| 765 | void md_rdev_clear(struct md_rdev *rdev) |
| 766 | { |
| 767 | if (rdev->sb_page) { |
| 768 | put_page(rdev->sb_page); |
| 769 | rdev->sb_loaded = 0; |
| 770 | rdev->sb_page = NULL; |
| 771 | rdev->sb_start = 0; |
| 772 | rdev->sectors = 0; |
| 773 | } |
| 774 | if (rdev->bb_page) { |
| 775 | put_page(rdev->bb_page); |
| 776 | rdev->bb_page = NULL; |
| 777 | } |
| 778 | badblocks_exit(&rdev->badblocks); |
| 779 | } |
| 780 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
| 781 | |
| 782 | static void super_written(struct bio *bio) |
| 783 | { |
| 784 | struct md_rdev *rdev = bio->bi_private; |
| 785 | struct mddev *mddev = rdev->mddev; |
| 786 | |
| 787 | if (bio->bi_status) { |
| 788 | pr_err("md: super_written gets error=%d\n", bio->bi_status); |
| 789 | md_error(mddev, rdev); |
| 790 | if (!test_bit(Faulty, &rdev->flags) |
| 791 | && (bio->bi_opf & MD_FAILFAST)) { |
| 792 | set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags); |
| 793 | set_bit(LastDev, &rdev->flags); |
| 794 | } |
| 795 | } else |
| 796 | clear_bit(LastDev, &rdev->flags); |
| 797 | |
| 798 | if (atomic_dec_and_test(&mddev->pending_writes)) |
| 799 | wake_up(&mddev->sb_wait); |
| 800 | rdev_dec_pending(rdev, mddev); |
| 801 | bio_put(bio); |
| 802 | } |
| 803 | |
| 804 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
| 805 | sector_t sector, int size, struct page *page) |
| 806 | { |
| 807 | /* write first size bytes of page to sector of rdev |
| 808 | * Increment mddev->pending_writes before returning |
| 809 | * and decrement it on completion, waking up sb_wait |
| 810 | * if zero is reached. |
| 811 | * If an error occurred, call md_error |
| 812 | */ |
| 813 | struct bio *bio; |
| 814 | int ff = 0; |
| 815 | |
| 816 | if (!page) |
| 817 | return; |
| 818 | |
| 819 | if (test_bit(Faulty, &rdev->flags)) |
| 820 | return; |
| 821 | |
| 822 | bio = md_bio_alloc_sync(mddev); |
| 823 | |
| 824 | atomic_inc(&rdev->nr_pending); |
| 825 | |
| 826 | bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev); |
| 827 | bio->bi_iter.bi_sector = sector; |
| 828 | bio_add_page(bio, page, size, 0); |
| 829 | bio->bi_private = rdev; |
| 830 | bio->bi_end_io = super_written; |
| 831 | |
| 832 | if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) && |
| 833 | test_bit(FailFast, &rdev->flags) && |
| 834 | !test_bit(LastDev, &rdev->flags)) |
| 835 | ff = MD_FAILFAST; |
| 836 | bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff; |
| 837 | |
| 838 | atomic_inc(&mddev->pending_writes); |
| 839 | submit_bio(bio); |
| 840 | } |
| 841 | |
| 842 | int md_super_wait(struct mddev *mddev) |
| 843 | { |
| 844 | /* wait for all superblock writes that were scheduled to complete */ |
| 845 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
| 846 | if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags)) |
| 847 | return -EAGAIN; |
| 848 | return 0; |
| 849 | } |
| 850 | |
| 851 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
| 852 | struct page *page, int op, int op_flags, bool metadata_op) |
| 853 | { |
| 854 | struct bio *bio = md_bio_alloc_sync(rdev->mddev); |
| 855 | int ret; |
| 856 | |
| 857 | if (metadata_op && rdev->meta_bdev) |
| 858 | bio_set_dev(bio, rdev->meta_bdev); |
| 859 | else |
| 860 | bio_set_dev(bio, rdev->bdev); |
| 861 | bio_set_op_attrs(bio, op, op_flags); |
| 862 | if (metadata_op) |
| 863 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
| 864 | else if (rdev->mddev->reshape_position != MaxSector && |
| 865 | (rdev->mddev->reshape_backwards == |
| 866 | (sector >= rdev->mddev->reshape_position))) |
| 867 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
| 868 | else |
| 869 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
| 870 | bio_add_page(bio, page, size, 0); |
| 871 | |
| 872 | submit_bio_wait(bio); |
| 873 | |
| 874 | ret = !bio->bi_status; |
| 875 | bio_put(bio); |
| 876 | return ret; |
| 877 | } |
| 878 | EXPORT_SYMBOL_GPL(sync_page_io); |
| 879 | |
| 880 | static int read_disk_sb(struct md_rdev *rdev, int size) |
| 881 | { |
| 882 | char b[BDEVNAME_SIZE]; |
| 883 | |
| 884 | if (rdev->sb_loaded) |
| 885 | return 0; |
| 886 | |
| 887 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) |
| 888 | goto fail; |
| 889 | rdev->sb_loaded = 1; |
| 890 | return 0; |
| 891 | |
| 892 | fail: |
| 893 | pr_err("md: disabled device %s, could not read superblock.\n", |
| 894 | bdevname(rdev->bdev,b)); |
| 895 | return -EINVAL; |
| 896 | } |
| 897 | |
| 898 | static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
| 899 | { |
| 900 | return sb1->set_uuid0 == sb2->set_uuid0 && |
| 901 | sb1->set_uuid1 == sb2->set_uuid1 && |
| 902 | sb1->set_uuid2 == sb2->set_uuid2 && |
| 903 | sb1->set_uuid3 == sb2->set_uuid3; |
| 904 | } |
| 905 | |
| 906 | static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
| 907 | { |
| 908 | int ret; |
| 909 | mdp_super_t *tmp1, *tmp2; |
| 910 | |
| 911 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); |
| 912 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); |
| 913 | |
| 914 | if (!tmp1 || !tmp2) { |
| 915 | ret = 0; |
| 916 | goto abort; |
| 917 | } |
| 918 | |
| 919 | *tmp1 = *sb1; |
| 920 | *tmp2 = *sb2; |
| 921 | |
| 922 | /* |
| 923 | * nr_disks is not constant |
| 924 | */ |
| 925 | tmp1->nr_disks = 0; |
| 926 | tmp2->nr_disks = 0; |
| 927 | |
| 928 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
| 929 | abort: |
| 930 | kfree(tmp1); |
| 931 | kfree(tmp2); |
| 932 | return ret; |
| 933 | } |
| 934 | |
| 935 | static u32 md_csum_fold(u32 csum) |
| 936 | { |
| 937 | csum = (csum & 0xffff) + (csum >> 16); |
| 938 | return (csum & 0xffff) + (csum >> 16); |
| 939 | } |
| 940 | |
| 941 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
| 942 | { |
| 943 | u64 newcsum = 0; |
| 944 | u32 *sb32 = (u32*)sb; |
| 945 | int i; |
| 946 | unsigned int disk_csum, csum; |
| 947 | |
| 948 | disk_csum = sb->sb_csum; |
| 949 | sb->sb_csum = 0; |
| 950 | |
| 951 | for (i = 0; i < MD_SB_BYTES/4 ; i++) |
| 952 | newcsum += sb32[i]; |
| 953 | csum = (newcsum & 0xffffffff) + (newcsum>>32); |
| 954 | |
| 955 | #ifdef CONFIG_ALPHA |
| 956 | /* This used to use csum_partial, which was wrong for several |
| 957 | * reasons including that different results are returned on |
| 958 | * different architectures. It isn't critical that we get exactly |
| 959 | * the same return value as before (we always csum_fold before |
| 960 | * testing, and that removes any differences). However as we |
| 961 | * know that csum_partial always returned a 16bit value on |
| 962 | * alphas, do a fold to maximise conformity to previous behaviour. |
| 963 | */ |
| 964 | sb->sb_csum = md_csum_fold(disk_csum); |
| 965 | #else |
| 966 | sb->sb_csum = disk_csum; |
| 967 | #endif |
| 968 | return csum; |
| 969 | } |
| 970 | |
| 971 | /* |
| 972 | * Handle superblock details. |
| 973 | * We want to be able to handle multiple superblock formats |
| 974 | * so we have a common interface to them all, and an array of |
| 975 | * different handlers. |
| 976 | * We rely on user-space to write the initial superblock, and support |
| 977 | * reading and updating of superblocks. |
| 978 | * Interface methods are: |
| 979 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
| 980 | * loads and validates a superblock on dev. |
| 981 | * if refdev != NULL, compare superblocks on both devices |
| 982 | * Return: |
| 983 | * 0 - dev has a superblock that is compatible with refdev |
| 984 | * 1 - dev has a superblock that is compatible and newer than refdev |
| 985 | * so dev should be used as the refdev in future |
| 986 | * -EINVAL superblock incompatible or invalid |
| 987 | * -othererror e.g. -EIO |
| 988 | * |
| 989 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
| 990 | * Verify that dev is acceptable into mddev. |
| 991 | * The first time, mddev->raid_disks will be 0, and data from |
| 992 | * dev should be merged in. Subsequent calls check that dev |
| 993 | * is new enough. Return 0 or -EINVAL |
| 994 | * |
| 995 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
| 996 | * Update the superblock for rdev with data in mddev |
| 997 | * This does not write to disc. |
| 998 | * |
| 999 | */ |
| 1000 | |
| 1001 | struct super_type { |
| 1002 | char *name; |
| 1003 | struct module *owner; |
| 1004 | int (*load_super)(struct md_rdev *rdev, |
| 1005 | struct md_rdev *refdev, |
| 1006 | int minor_version); |
| 1007 | int (*validate_super)(struct mddev *mddev, |
| 1008 | struct md_rdev *rdev); |
| 1009 | void (*sync_super)(struct mddev *mddev, |
| 1010 | struct md_rdev *rdev); |
| 1011 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
| 1012 | sector_t num_sectors); |
| 1013 | int (*allow_new_offset)(struct md_rdev *rdev, |
| 1014 | unsigned long long new_offset); |
| 1015 | }; |
| 1016 | |
| 1017 | /* |
| 1018 | * Check that the given mddev has no bitmap. |
| 1019 | * |
| 1020 | * This function is called from the run method of all personalities that do not |
| 1021 | * support bitmaps. It prints an error message and returns non-zero if mddev |
| 1022 | * has a bitmap. Otherwise, it returns 0. |
| 1023 | * |
| 1024 | */ |
| 1025 | int md_check_no_bitmap(struct mddev *mddev) |
| 1026 | { |
| 1027 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
| 1028 | return 0; |
| 1029 | pr_warn("%s: bitmaps are not supported for %s\n", |
| 1030 | mdname(mddev), mddev->pers->name); |
| 1031 | return 1; |
| 1032 | } |
| 1033 | EXPORT_SYMBOL(md_check_no_bitmap); |
| 1034 | |
| 1035 | /* |
| 1036 | * load_super for 0.90.0 |
| 1037 | */ |
| 1038 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
| 1039 | { |
| 1040 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| 1041 | mdp_super_t *sb; |
| 1042 | int ret; |
| 1043 | |
| 1044 | /* |
| 1045 | * Calculate the position of the superblock (512byte sectors), |
| 1046 | * it's at the end of the disk. |
| 1047 | * |
| 1048 | * It also happens to be a multiple of 4Kb. |
| 1049 | */ |
| 1050 | rdev->sb_start = calc_dev_sboffset(rdev); |
| 1051 | |
| 1052 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
| 1053 | if (ret) |
| 1054 | return ret; |
| 1055 | |
| 1056 | ret = -EINVAL; |
| 1057 | |
| 1058 | bdevname(rdev->bdev, b); |
| 1059 | sb = page_address(rdev->sb_page); |
| 1060 | |
| 1061 | if (sb->md_magic != MD_SB_MAGIC) { |
| 1062 | pr_warn("md: invalid raid superblock magic on %s\n", b); |
| 1063 | goto abort; |
| 1064 | } |
| 1065 | |
| 1066 | if (sb->major_version != 0 || |
| 1067 | sb->minor_version < 90 || |
| 1068 | sb->minor_version > 91) { |
| 1069 | pr_warn("Bad version number %d.%d on %s\n", |
| 1070 | sb->major_version, sb->minor_version, b); |
| 1071 | goto abort; |
| 1072 | } |
| 1073 | |
| 1074 | if (sb->raid_disks <= 0) |
| 1075 | goto abort; |
| 1076 | |
| 1077 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
| 1078 | pr_warn("md: invalid superblock checksum on %s\n", b); |
| 1079 | goto abort; |
| 1080 | } |
| 1081 | |
| 1082 | rdev->preferred_minor = sb->md_minor; |
| 1083 | rdev->data_offset = 0; |
| 1084 | rdev->new_data_offset = 0; |
| 1085 | rdev->sb_size = MD_SB_BYTES; |
| 1086 | rdev->badblocks.shift = -1; |
| 1087 | |
| 1088 | if (sb->level == LEVEL_MULTIPATH) |
| 1089 | rdev->desc_nr = -1; |
| 1090 | else |
| 1091 | rdev->desc_nr = sb->this_disk.number; |
| 1092 | |
| 1093 | if (!refdev) { |
| 1094 | ret = 1; |
| 1095 | } else { |
| 1096 | __u64 ev1, ev2; |
| 1097 | mdp_super_t *refsb = page_address(refdev->sb_page); |
| 1098 | if (!md_uuid_equal(refsb, sb)) { |
| 1099 | pr_warn("md: %s has different UUID to %s\n", |
| 1100 | b, bdevname(refdev->bdev,b2)); |
| 1101 | goto abort; |
| 1102 | } |
| 1103 | if (!md_sb_equal(refsb, sb)) { |
| 1104 | pr_warn("md: %s has same UUID but different superblock to %s\n", |
| 1105 | b, bdevname(refdev->bdev, b2)); |
| 1106 | goto abort; |
| 1107 | } |
| 1108 | ev1 = md_event(sb); |
| 1109 | ev2 = md_event(refsb); |
| 1110 | if (ev1 > ev2) |
| 1111 | ret = 1; |
| 1112 | else |
| 1113 | ret = 0; |
| 1114 | } |
| 1115 | rdev->sectors = rdev->sb_start; |
| 1116 | /* Limit to 4TB as metadata cannot record more than that. |
| 1117 | * (not needed for Linear and RAID0 as metadata doesn't |
| 1118 | * record this size) |
| 1119 | */ |
| 1120 | if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) && |
| 1121 | sb->level >= 1) |
| 1122 | rdev->sectors = (sector_t)(2ULL << 32) - 2; |
| 1123 | |
| 1124 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
| 1125 | /* "this cannot possibly happen" ... */ |
| 1126 | ret = -EINVAL; |
| 1127 | |
| 1128 | abort: |
| 1129 | return ret; |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * validate_super for 0.90.0 |
| 1134 | */ |
| 1135 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
| 1136 | { |
| 1137 | mdp_disk_t *desc; |
| 1138 | mdp_super_t *sb = page_address(rdev->sb_page); |
| 1139 | __u64 ev1 = md_event(sb); |
| 1140 | |
| 1141 | rdev->raid_disk = -1; |
| 1142 | clear_bit(Faulty, &rdev->flags); |
| 1143 | clear_bit(In_sync, &rdev->flags); |
| 1144 | clear_bit(Bitmap_sync, &rdev->flags); |
| 1145 | clear_bit(WriteMostly, &rdev->flags); |
| 1146 | |
| 1147 | if (mddev->raid_disks == 0) { |
| 1148 | mddev->major_version = 0; |
| 1149 | mddev->minor_version = sb->minor_version; |
| 1150 | mddev->patch_version = sb->patch_version; |
| 1151 | mddev->external = 0; |
| 1152 | mddev->chunk_sectors = sb->chunk_size >> 9; |
| 1153 | mddev->ctime = sb->ctime; |
| 1154 | mddev->utime = sb->utime; |
| 1155 | mddev->level = sb->level; |
| 1156 | mddev->clevel[0] = 0; |
| 1157 | mddev->layout = sb->layout; |
| 1158 | mddev->raid_disks = sb->raid_disks; |
| 1159 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
| 1160 | mddev->events = ev1; |
| 1161 | mddev->bitmap_info.offset = 0; |
| 1162 | mddev->bitmap_info.space = 0; |
| 1163 | /* bitmap can use 60 K after the 4K superblocks */ |
| 1164 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
| 1165 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
| 1166 | mddev->reshape_backwards = 0; |
| 1167 | |
| 1168 | if (mddev->minor_version >= 91) { |
| 1169 | mddev->reshape_position = sb->reshape_position; |
| 1170 | mddev->delta_disks = sb->delta_disks; |
| 1171 | mddev->new_level = sb->new_level; |
| 1172 | mddev->new_layout = sb->new_layout; |
| 1173 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
| 1174 | if (mddev->delta_disks < 0) |
| 1175 | mddev->reshape_backwards = 1; |
| 1176 | } else { |
| 1177 | mddev->reshape_position = MaxSector; |
| 1178 | mddev->delta_disks = 0; |
| 1179 | mddev->new_level = mddev->level; |
| 1180 | mddev->new_layout = mddev->layout; |
| 1181 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 1182 | } |
| 1183 | |
| 1184 | if (sb->state & (1<<MD_SB_CLEAN)) |
| 1185 | mddev->recovery_cp = MaxSector; |
| 1186 | else { |
| 1187 | if (sb->events_hi == sb->cp_events_hi && |
| 1188 | sb->events_lo == sb->cp_events_lo) { |
| 1189 | mddev->recovery_cp = sb->recovery_cp; |
| 1190 | } else |
| 1191 | mddev->recovery_cp = 0; |
| 1192 | } |
| 1193 | |
| 1194 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); |
| 1195 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); |
| 1196 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); |
| 1197 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); |
| 1198 | |
| 1199 | mddev->max_disks = MD_SB_DISKS; |
| 1200 | |
| 1201 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && |
| 1202 | mddev->bitmap_info.file == NULL) { |
| 1203 | mddev->bitmap_info.offset = |
| 1204 | mddev->bitmap_info.default_offset; |
| 1205 | mddev->bitmap_info.space = |
| 1206 | mddev->bitmap_info.default_space; |
| 1207 | } |
| 1208 | |
| 1209 | } else if (mddev->pers == NULL) { |
| 1210 | /* Insist on good event counter while assembling, except |
| 1211 | * for spares (which don't need an event count) */ |
| 1212 | ++ev1; |
| 1213 | if (sb->disks[rdev->desc_nr].state & ( |
| 1214 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) |
| 1215 | if (ev1 < mddev->events) |
| 1216 | return -EINVAL; |
| 1217 | } else if (mddev->bitmap) { |
| 1218 | /* if adding to array with a bitmap, then we can accept an |
| 1219 | * older device ... but not too old. |
| 1220 | */ |
| 1221 | if (ev1 < mddev->bitmap->events_cleared) |
| 1222 | return 0; |
| 1223 | if (ev1 < mddev->events) |
| 1224 | set_bit(Bitmap_sync, &rdev->flags); |
| 1225 | } else { |
| 1226 | if (ev1 < mddev->events) |
| 1227 | /* just a hot-add of a new device, leave raid_disk at -1 */ |
| 1228 | return 0; |
| 1229 | } |
| 1230 | |
| 1231 | if (mddev->level != LEVEL_MULTIPATH) { |
| 1232 | desc = sb->disks + rdev->desc_nr; |
| 1233 | |
| 1234 | if (desc->state & (1<<MD_DISK_FAULTY)) |
| 1235 | set_bit(Faulty, &rdev->flags); |
| 1236 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
| 1237 | desc->raid_disk < mddev->raid_disks */) { |
| 1238 | set_bit(In_sync, &rdev->flags); |
| 1239 | rdev->raid_disk = desc->raid_disk; |
| 1240 | rdev->saved_raid_disk = desc->raid_disk; |
| 1241 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
| 1242 | /* active but not in sync implies recovery up to |
| 1243 | * reshape position. We don't know exactly where |
| 1244 | * that is, so set to zero for now */ |
| 1245 | if (mddev->minor_version >= 91) { |
| 1246 | rdev->recovery_offset = 0; |
| 1247 | rdev->raid_disk = desc->raid_disk; |
| 1248 | } |
| 1249 | } |
| 1250 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
| 1251 | set_bit(WriteMostly, &rdev->flags); |
| 1252 | if (desc->state & (1<<MD_DISK_FAILFAST)) |
| 1253 | set_bit(FailFast, &rdev->flags); |
| 1254 | } else /* MULTIPATH are always insync */ |
| 1255 | set_bit(In_sync, &rdev->flags); |
| 1256 | return 0; |
| 1257 | } |
| 1258 | |
| 1259 | /* |
| 1260 | * sync_super for 0.90.0 |
| 1261 | */ |
| 1262 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
| 1263 | { |
| 1264 | mdp_super_t *sb; |
| 1265 | struct md_rdev *rdev2; |
| 1266 | int next_spare = mddev->raid_disks; |
| 1267 | |
| 1268 | /* make rdev->sb match mddev data.. |
| 1269 | * |
| 1270 | * 1/ zero out disks |
| 1271 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); |
| 1272 | * 3/ any empty disks < next_spare become removed |
| 1273 | * |
| 1274 | * disks[0] gets initialised to REMOVED because |
| 1275 | * we cannot be sure from other fields if it has |
| 1276 | * been initialised or not. |
| 1277 | */ |
| 1278 | int i; |
| 1279 | int active=0, working=0,failed=0,spare=0,nr_disks=0; |
| 1280 | |
| 1281 | rdev->sb_size = MD_SB_BYTES; |
| 1282 | |
| 1283 | sb = page_address(rdev->sb_page); |
| 1284 | |
| 1285 | memset(sb, 0, sizeof(*sb)); |
| 1286 | |
| 1287 | sb->md_magic = MD_SB_MAGIC; |
| 1288 | sb->major_version = mddev->major_version; |
| 1289 | sb->patch_version = mddev->patch_version; |
| 1290 | sb->gvalid_words = 0; /* ignored */ |
| 1291 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); |
| 1292 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); |
| 1293 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); |
| 1294 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); |
| 1295 | |
| 1296 | sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); |
| 1297 | sb->level = mddev->level; |
| 1298 | sb->size = mddev->dev_sectors / 2; |
| 1299 | sb->raid_disks = mddev->raid_disks; |
| 1300 | sb->md_minor = mddev->md_minor; |
| 1301 | sb->not_persistent = 0; |
| 1302 | sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); |
| 1303 | sb->state = 0; |
| 1304 | sb->events_hi = (mddev->events>>32); |
| 1305 | sb->events_lo = (u32)mddev->events; |
| 1306 | |
| 1307 | if (mddev->reshape_position == MaxSector) |
| 1308 | sb->minor_version = 90; |
| 1309 | else { |
| 1310 | sb->minor_version = 91; |
| 1311 | sb->reshape_position = mddev->reshape_position; |
| 1312 | sb->new_level = mddev->new_level; |
| 1313 | sb->delta_disks = mddev->delta_disks; |
| 1314 | sb->new_layout = mddev->new_layout; |
| 1315 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
| 1316 | } |
| 1317 | mddev->minor_version = sb->minor_version; |
| 1318 | if (mddev->in_sync) |
| 1319 | { |
| 1320 | sb->recovery_cp = mddev->recovery_cp; |
| 1321 | sb->cp_events_hi = (mddev->events>>32); |
| 1322 | sb->cp_events_lo = (u32)mddev->events; |
| 1323 | if (mddev->recovery_cp == MaxSector) |
| 1324 | sb->state = (1<< MD_SB_CLEAN); |
| 1325 | } else |
| 1326 | sb->recovery_cp = 0; |
| 1327 | |
| 1328 | sb->layout = mddev->layout; |
| 1329 | sb->chunk_size = mddev->chunk_sectors << 9; |
| 1330 | |
| 1331 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
| 1332 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
| 1333 | |
| 1334 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
| 1335 | rdev_for_each(rdev2, mddev) { |
| 1336 | mdp_disk_t *d; |
| 1337 | int desc_nr; |
| 1338 | int is_active = test_bit(In_sync, &rdev2->flags); |
| 1339 | |
| 1340 | if (rdev2->raid_disk >= 0 && |
| 1341 | sb->minor_version >= 91) |
| 1342 | /* we have nowhere to store the recovery_offset, |
| 1343 | * but if it is not below the reshape_position, |
| 1344 | * we can piggy-back on that. |
| 1345 | */ |
| 1346 | is_active = 1; |
| 1347 | if (rdev2->raid_disk < 0 || |
| 1348 | test_bit(Faulty, &rdev2->flags)) |
| 1349 | is_active = 0; |
| 1350 | if (is_active) |
| 1351 | desc_nr = rdev2->raid_disk; |
| 1352 | else |
| 1353 | desc_nr = next_spare++; |
| 1354 | rdev2->desc_nr = desc_nr; |
| 1355 | d = &sb->disks[rdev2->desc_nr]; |
| 1356 | nr_disks++; |
| 1357 | d->number = rdev2->desc_nr; |
| 1358 | d->major = MAJOR(rdev2->bdev->bd_dev); |
| 1359 | d->minor = MINOR(rdev2->bdev->bd_dev); |
| 1360 | if (is_active) |
| 1361 | d->raid_disk = rdev2->raid_disk; |
| 1362 | else |
| 1363 | d->raid_disk = rdev2->desc_nr; /* compatibility */ |
| 1364 | if (test_bit(Faulty, &rdev2->flags)) |
| 1365 | d->state = (1<<MD_DISK_FAULTY); |
| 1366 | else if (is_active) { |
| 1367 | d->state = (1<<MD_DISK_ACTIVE); |
| 1368 | if (test_bit(In_sync, &rdev2->flags)) |
| 1369 | d->state |= (1<<MD_DISK_SYNC); |
| 1370 | active++; |
| 1371 | working++; |
| 1372 | } else { |
| 1373 | d->state = 0; |
| 1374 | spare++; |
| 1375 | working++; |
| 1376 | } |
| 1377 | if (test_bit(WriteMostly, &rdev2->flags)) |
| 1378 | d->state |= (1<<MD_DISK_WRITEMOSTLY); |
| 1379 | if (test_bit(FailFast, &rdev2->flags)) |
| 1380 | d->state |= (1<<MD_DISK_FAILFAST); |
| 1381 | } |
| 1382 | /* now set the "removed" and "faulty" bits on any missing devices */ |
| 1383 | for (i=0 ; i < mddev->raid_disks ; i++) { |
| 1384 | mdp_disk_t *d = &sb->disks[i]; |
| 1385 | if (d->state == 0 && d->number == 0) { |
| 1386 | d->number = i; |
| 1387 | d->raid_disk = i; |
| 1388 | d->state = (1<<MD_DISK_REMOVED); |
| 1389 | d->state |= (1<<MD_DISK_FAULTY); |
| 1390 | failed++; |
| 1391 | } |
| 1392 | } |
| 1393 | sb->nr_disks = nr_disks; |
| 1394 | sb->active_disks = active; |
| 1395 | sb->working_disks = working; |
| 1396 | sb->failed_disks = failed; |
| 1397 | sb->spare_disks = spare; |
| 1398 | |
| 1399 | sb->this_disk = sb->disks[rdev->desc_nr]; |
| 1400 | sb->sb_csum = calc_sb_csum(sb); |
| 1401 | } |
| 1402 | |
| 1403 | /* |
| 1404 | * rdev_size_change for 0.90.0 |
| 1405 | */ |
| 1406 | static unsigned long long |
| 1407 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
| 1408 | { |
| 1409 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
| 1410 | return 0; /* component must fit device */ |
| 1411 | if (rdev->mddev->bitmap_info.offset) |
| 1412 | return 0; /* can't move bitmap */ |
| 1413 | rdev->sb_start = calc_dev_sboffset(rdev); |
| 1414 | if (!num_sectors || num_sectors > rdev->sb_start) |
| 1415 | num_sectors = rdev->sb_start; |
| 1416 | /* Limit to 4TB as metadata cannot record more than that. |
| 1417 | * 4TB == 2^32 KB, or 2*2^32 sectors. |
| 1418 | */ |
| 1419 | if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) && |
| 1420 | rdev->mddev->level >= 1) |
| 1421 | num_sectors = (sector_t)(2ULL << 32) - 2; |
| 1422 | do { |
| 1423 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
| 1424 | rdev->sb_page); |
| 1425 | } while (md_super_wait(rdev->mddev) < 0); |
| 1426 | return num_sectors; |
| 1427 | } |
| 1428 | |
| 1429 | static int |
| 1430 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) |
| 1431 | { |
| 1432 | /* non-zero offset changes not possible with v0.90 */ |
| 1433 | return new_offset == 0; |
| 1434 | } |
| 1435 | |
| 1436 | /* |
| 1437 | * version 1 superblock |
| 1438 | */ |
| 1439 | |
| 1440 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
| 1441 | { |
| 1442 | __le32 disk_csum; |
| 1443 | u32 csum; |
| 1444 | unsigned long long newcsum; |
| 1445 | int size = 256 + le32_to_cpu(sb->max_dev)*2; |
| 1446 | __le32 *isuper = (__le32*)sb; |
| 1447 | |
| 1448 | disk_csum = sb->sb_csum; |
| 1449 | sb->sb_csum = 0; |
| 1450 | newcsum = 0; |
| 1451 | for (; size >= 4; size -= 4) |
| 1452 | newcsum += le32_to_cpu(*isuper++); |
| 1453 | |
| 1454 | if (size == 2) |
| 1455 | newcsum += le16_to_cpu(*(__le16*) isuper); |
| 1456 | |
| 1457 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); |
| 1458 | sb->sb_csum = disk_csum; |
| 1459 | return cpu_to_le32(csum); |
| 1460 | } |
| 1461 | |
| 1462 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
| 1463 | { |
| 1464 | struct mdp_superblock_1 *sb; |
| 1465 | int ret; |
| 1466 | sector_t sb_start; |
| 1467 | sector_t sectors; |
| 1468 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| 1469 | int bmask; |
| 1470 | |
| 1471 | /* |
| 1472 | * Calculate the position of the superblock in 512byte sectors. |
| 1473 | * It is always aligned to a 4K boundary and |
| 1474 | * depeding on minor_version, it can be: |
| 1475 | * 0: At least 8K, but less than 12K, from end of device |
| 1476 | * 1: At start of device |
| 1477 | * 2: 4K from start of device. |
| 1478 | */ |
| 1479 | switch(minor_version) { |
| 1480 | case 0: |
| 1481 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
| 1482 | sb_start -= 8*2; |
| 1483 | sb_start &= ~(sector_t)(4*2-1); |
| 1484 | break; |
| 1485 | case 1: |
| 1486 | sb_start = 0; |
| 1487 | break; |
| 1488 | case 2: |
| 1489 | sb_start = 8; |
| 1490 | break; |
| 1491 | default: |
| 1492 | return -EINVAL; |
| 1493 | } |
| 1494 | rdev->sb_start = sb_start; |
| 1495 | |
| 1496 | /* superblock is rarely larger than 1K, but it can be larger, |
| 1497 | * and it is safe to read 4k, so we do that |
| 1498 | */ |
| 1499 | ret = read_disk_sb(rdev, 4096); |
| 1500 | if (ret) return ret; |
| 1501 | |
| 1502 | sb = page_address(rdev->sb_page); |
| 1503 | |
| 1504 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || |
| 1505 | sb->major_version != cpu_to_le32(1) || |
| 1506 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || |
| 1507 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
| 1508 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
| 1509 | return -EINVAL; |
| 1510 | |
| 1511 | if (calc_sb_1_csum(sb) != sb->sb_csum) { |
| 1512 | pr_warn("md: invalid superblock checksum on %s\n", |
| 1513 | bdevname(rdev->bdev,b)); |
| 1514 | return -EINVAL; |
| 1515 | } |
| 1516 | if (le64_to_cpu(sb->data_size) < 10) { |
| 1517 | pr_warn("md: data_size too small on %s\n", |
| 1518 | bdevname(rdev->bdev,b)); |
| 1519 | return -EINVAL; |
| 1520 | } |
| 1521 | if (sb->pad0 || |
| 1522 | sb->pad3[0] || |
| 1523 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) |
| 1524 | /* Some padding is non-zero, might be a new feature */ |
| 1525 | return -EINVAL; |
| 1526 | |
| 1527 | rdev->preferred_minor = 0xffff; |
| 1528 | rdev->data_offset = le64_to_cpu(sb->data_offset); |
| 1529 | rdev->new_data_offset = rdev->data_offset; |
| 1530 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && |
| 1531 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) |
| 1532 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); |
| 1533 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
| 1534 | |
| 1535 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
| 1536 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
| 1537 | if (rdev->sb_size & bmask) |
| 1538 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
| 1539 | |
| 1540 | if (minor_version |
| 1541 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
| 1542 | return -EINVAL; |
| 1543 | if (minor_version |
| 1544 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) |
| 1545 | return -EINVAL; |
| 1546 | |
| 1547 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
| 1548 | rdev->desc_nr = -1; |
| 1549 | else |
| 1550 | rdev->desc_nr = le32_to_cpu(sb->dev_number); |
| 1551 | |
| 1552 | if (!rdev->bb_page) { |
| 1553 | rdev->bb_page = alloc_page(GFP_KERNEL); |
| 1554 | if (!rdev->bb_page) |
| 1555 | return -ENOMEM; |
| 1556 | } |
| 1557 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && |
| 1558 | rdev->badblocks.count == 0) { |
| 1559 | /* need to load the bad block list. |
| 1560 | * Currently we limit it to one page. |
| 1561 | */ |
| 1562 | s32 offset; |
| 1563 | sector_t bb_sector; |
| 1564 | u64 *bbp; |
| 1565 | int i; |
| 1566 | int sectors = le16_to_cpu(sb->bblog_size); |
| 1567 | if (sectors > (PAGE_SIZE / 512)) |
| 1568 | return -EINVAL; |
| 1569 | offset = le32_to_cpu(sb->bblog_offset); |
| 1570 | if (offset == 0) |
| 1571 | return -EINVAL; |
| 1572 | bb_sector = (long long)offset; |
| 1573 | if (!sync_page_io(rdev, bb_sector, sectors << 9, |
| 1574 | rdev->bb_page, REQ_OP_READ, 0, true)) |
| 1575 | return -EIO; |
| 1576 | bbp = (u64 *)page_address(rdev->bb_page); |
| 1577 | rdev->badblocks.shift = sb->bblog_shift; |
| 1578 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { |
| 1579 | u64 bb = le64_to_cpu(*bbp); |
| 1580 | int count = bb & (0x3ff); |
| 1581 | u64 sector = bb >> 10; |
| 1582 | sector <<= sb->bblog_shift; |
| 1583 | count <<= sb->bblog_shift; |
| 1584 | if (bb + 1 == 0) |
| 1585 | break; |
| 1586 | if (badblocks_set(&rdev->badblocks, sector, count, 1)) |
| 1587 | return -EINVAL; |
| 1588 | } |
| 1589 | } else if (sb->bblog_offset != 0) |
| 1590 | rdev->badblocks.shift = 0; |
| 1591 | |
| 1592 | if ((le32_to_cpu(sb->feature_map) & |
| 1593 | (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) { |
| 1594 | rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset); |
| 1595 | rdev->ppl.size = le16_to_cpu(sb->ppl.size); |
| 1596 | rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset; |
| 1597 | } |
| 1598 | |
| 1599 | if (!refdev) { |
| 1600 | ret = 1; |
| 1601 | } else { |
| 1602 | __u64 ev1, ev2; |
| 1603 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
| 1604 | |
| 1605 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || |
| 1606 | sb->level != refsb->level || |
| 1607 | sb->layout != refsb->layout || |
| 1608 | sb->chunksize != refsb->chunksize) { |
| 1609 | pr_warn("md: %s has strangely different superblock to %s\n", |
| 1610 | bdevname(rdev->bdev,b), |
| 1611 | bdevname(refdev->bdev,b2)); |
| 1612 | return -EINVAL; |
| 1613 | } |
| 1614 | ev1 = le64_to_cpu(sb->events); |
| 1615 | ev2 = le64_to_cpu(refsb->events); |
| 1616 | |
| 1617 | if (ev1 > ev2) |
| 1618 | ret = 1; |
| 1619 | else |
| 1620 | ret = 0; |
| 1621 | } |
| 1622 | if (minor_version) { |
| 1623 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); |
| 1624 | sectors -= rdev->data_offset; |
| 1625 | } else |
| 1626 | sectors = rdev->sb_start; |
| 1627 | if (sectors < le64_to_cpu(sb->data_size)) |
| 1628 | return -EINVAL; |
| 1629 | rdev->sectors = le64_to_cpu(sb->data_size); |
| 1630 | return ret; |
| 1631 | } |
| 1632 | |
| 1633 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
| 1634 | { |
| 1635 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
| 1636 | __u64 ev1 = le64_to_cpu(sb->events); |
| 1637 | |
| 1638 | rdev->raid_disk = -1; |
| 1639 | clear_bit(Faulty, &rdev->flags); |
| 1640 | clear_bit(In_sync, &rdev->flags); |
| 1641 | clear_bit(Bitmap_sync, &rdev->flags); |
| 1642 | clear_bit(WriteMostly, &rdev->flags); |
| 1643 | |
| 1644 | if (mddev->raid_disks == 0) { |
| 1645 | mddev->major_version = 1; |
| 1646 | mddev->patch_version = 0; |
| 1647 | mddev->external = 0; |
| 1648 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
| 1649 | mddev->ctime = le64_to_cpu(sb->ctime); |
| 1650 | mddev->utime = le64_to_cpu(sb->utime); |
| 1651 | mddev->level = le32_to_cpu(sb->level); |
| 1652 | mddev->clevel[0] = 0; |
| 1653 | mddev->layout = le32_to_cpu(sb->layout); |
| 1654 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); |
| 1655 | mddev->dev_sectors = le64_to_cpu(sb->size); |
| 1656 | mddev->events = ev1; |
| 1657 | mddev->bitmap_info.offset = 0; |
| 1658 | mddev->bitmap_info.space = 0; |
| 1659 | /* Default location for bitmap is 1K after superblock |
| 1660 | * using 3K - total of 4K |
| 1661 | */ |
| 1662 | mddev->bitmap_info.default_offset = 1024 >> 9; |
| 1663 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
| 1664 | mddev->reshape_backwards = 0; |
| 1665 | |
| 1666 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
| 1667 | memcpy(mddev->uuid, sb->set_uuid, 16); |
| 1668 | |
| 1669 | mddev->max_disks = (4096-256)/2; |
| 1670 | |
| 1671 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
| 1672 | mddev->bitmap_info.file == NULL) { |
| 1673 | mddev->bitmap_info.offset = |
| 1674 | (__s32)le32_to_cpu(sb->bitmap_offset); |
| 1675 | /* Metadata doesn't record how much space is available. |
| 1676 | * For 1.0, we assume we can use up to the superblock |
| 1677 | * if before, else to 4K beyond superblock. |
| 1678 | * For others, assume no change is possible. |
| 1679 | */ |
| 1680 | if (mddev->minor_version > 0) |
| 1681 | mddev->bitmap_info.space = 0; |
| 1682 | else if (mddev->bitmap_info.offset > 0) |
| 1683 | mddev->bitmap_info.space = |
| 1684 | 8 - mddev->bitmap_info.offset; |
| 1685 | else |
| 1686 | mddev->bitmap_info.space = |
| 1687 | -mddev->bitmap_info.offset; |
| 1688 | } |
| 1689 | |
| 1690 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
| 1691 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); |
| 1692 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); |
| 1693 | mddev->new_level = le32_to_cpu(sb->new_level); |
| 1694 | mddev->new_layout = le32_to_cpu(sb->new_layout); |
| 1695 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
| 1696 | if (mddev->delta_disks < 0 || |
| 1697 | (mddev->delta_disks == 0 && |
| 1698 | (le32_to_cpu(sb->feature_map) |
| 1699 | & MD_FEATURE_RESHAPE_BACKWARDS))) |
| 1700 | mddev->reshape_backwards = 1; |
| 1701 | } else { |
| 1702 | mddev->reshape_position = MaxSector; |
| 1703 | mddev->delta_disks = 0; |
| 1704 | mddev->new_level = mddev->level; |
| 1705 | mddev->new_layout = mddev->layout; |
| 1706 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 1707 | } |
| 1708 | |
| 1709 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) |
| 1710 | set_bit(MD_HAS_JOURNAL, &mddev->flags); |
| 1711 | |
| 1712 | if (le32_to_cpu(sb->feature_map) & |
| 1713 | (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) { |
| 1714 | if (le32_to_cpu(sb->feature_map) & |
| 1715 | (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL)) |
| 1716 | return -EINVAL; |
| 1717 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) && |
| 1718 | (le32_to_cpu(sb->feature_map) & |
| 1719 | MD_FEATURE_MULTIPLE_PPLS)) |
| 1720 | return -EINVAL; |
| 1721 | set_bit(MD_HAS_PPL, &mddev->flags); |
| 1722 | } |
| 1723 | } else if (mddev->pers == NULL) { |
| 1724 | /* Insist of good event counter while assembling, except for |
| 1725 | * spares (which don't need an event count) */ |
| 1726 | ++ev1; |
| 1727 | if (rdev->desc_nr >= 0 && |
| 1728 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && |
| 1729 | (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || |
| 1730 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) |
| 1731 | if (ev1 < mddev->events) |
| 1732 | return -EINVAL; |
| 1733 | } else if (mddev->bitmap) { |
| 1734 | /* If adding to array with a bitmap, then we can accept an |
| 1735 | * older device, but not too old. |
| 1736 | */ |
| 1737 | if (ev1 < mddev->bitmap->events_cleared) |
| 1738 | return 0; |
| 1739 | if (ev1 < mddev->events) |
| 1740 | set_bit(Bitmap_sync, &rdev->flags); |
| 1741 | } else { |
| 1742 | if (ev1 < mddev->events) |
| 1743 | /* just a hot-add of a new device, leave raid_disk at -1 */ |
| 1744 | return 0; |
| 1745 | } |
| 1746 | if (mddev->level != LEVEL_MULTIPATH) { |
| 1747 | int role; |
| 1748 | if (rdev->desc_nr < 0 || |
| 1749 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { |
| 1750 | role = MD_DISK_ROLE_SPARE; |
| 1751 | rdev->desc_nr = -1; |
| 1752 | } else |
| 1753 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
| 1754 | switch(role) { |
| 1755 | case MD_DISK_ROLE_SPARE: /* spare */ |
| 1756 | break; |
| 1757 | case MD_DISK_ROLE_FAULTY: /* faulty */ |
| 1758 | set_bit(Faulty, &rdev->flags); |
| 1759 | break; |
| 1760 | case MD_DISK_ROLE_JOURNAL: /* journal device */ |
| 1761 | if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { |
| 1762 | /* journal device without journal feature */ |
| 1763 | pr_warn("md: journal device provided without journal feature, ignoring the device\n"); |
| 1764 | return -EINVAL; |
| 1765 | } |
| 1766 | set_bit(Journal, &rdev->flags); |
| 1767 | rdev->journal_tail = le64_to_cpu(sb->journal_tail); |
| 1768 | rdev->raid_disk = 0; |
| 1769 | break; |
| 1770 | default: |
| 1771 | rdev->saved_raid_disk = role; |
| 1772 | if ((le32_to_cpu(sb->feature_map) & |
| 1773 | MD_FEATURE_RECOVERY_OFFSET)) { |
| 1774 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
| 1775 | if (!(le32_to_cpu(sb->feature_map) & |
| 1776 | MD_FEATURE_RECOVERY_BITMAP)) |
| 1777 | rdev->saved_raid_disk = -1; |
| 1778 | } else |
| 1779 | set_bit(In_sync, &rdev->flags); |
| 1780 | rdev->raid_disk = role; |
| 1781 | break; |
| 1782 | } |
| 1783 | if (sb->devflags & WriteMostly1) |
| 1784 | set_bit(WriteMostly, &rdev->flags); |
| 1785 | if (sb->devflags & FailFast1) |
| 1786 | set_bit(FailFast, &rdev->flags); |
| 1787 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
| 1788 | set_bit(Replacement, &rdev->flags); |
| 1789 | } else /* MULTIPATH are always insync */ |
| 1790 | set_bit(In_sync, &rdev->flags); |
| 1791 | |
| 1792 | return 0; |
| 1793 | } |
| 1794 | |
| 1795 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
| 1796 | { |
| 1797 | struct mdp_superblock_1 *sb; |
| 1798 | struct md_rdev *rdev2; |
| 1799 | int max_dev, i; |
| 1800 | /* make rdev->sb match mddev and rdev data. */ |
| 1801 | |
| 1802 | sb = page_address(rdev->sb_page); |
| 1803 | |
| 1804 | sb->feature_map = 0; |
| 1805 | sb->pad0 = 0; |
| 1806 | sb->recovery_offset = cpu_to_le64(0); |
| 1807 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
| 1808 | |
| 1809 | sb->utime = cpu_to_le64((__u64)mddev->utime); |
| 1810 | sb->events = cpu_to_le64(mddev->events); |
| 1811 | if (mddev->in_sync) |
| 1812 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); |
| 1813 | else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) |
| 1814 | sb->resync_offset = cpu_to_le64(MaxSector); |
| 1815 | else |
| 1816 | sb->resync_offset = cpu_to_le64(0); |
| 1817 | |
| 1818 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
| 1819 | |
| 1820 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
| 1821 | sb->size = cpu_to_le64(mddev->dev_sectors); |
| 1822 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
| 1823 | sb->level = cpu_to_le32(mddev->level); |
| 1824 | sb->layout = cpu_to_le32(mddev->layout); |
| 1825 | if (test_bit(FailFast, &rdev->flags)) |
| 1826 | sb->devflags |= FailFast1; |
| 1827 | else |
| 1828 | sb->devflags &= ~FailFast1; |
| 1829 | |
| 1830 | if (test_bit(WriteMostly, &rdev->flags)) |
| 1831 | sb->devflags |= WriteMostly1; |
| 1832 | else |
| 1833 | sb->devflags &= ~WriteMostly1; |
| 1834 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
| 1835 | sb->data_size = cpu_to_le64(rdev->sectors); |
| 1836 | |
| 1837 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
| 1838 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); |
| 1839 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
| 1840 | } |
| 1841 | |
| 1842 | if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && |
| 1843 | !test_bit(In_sync, &rdev->flags)) { |
| 1844 | sb->feature_map |= |
| 1845 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); |
| 1846 | sb->recovery_offset = |
| 1847 | cpu_to_le64(rdev->recovery_offset); |
| 1848 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
| 1849 | sb->feature_map |= |
| 1850 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); |
| 1851 | } |
| 1852 | /* Note: recovery_offset and journal_tail share space */ |
| 1853 | if (test_bit(Journal, &rdev->flags)) |
| 1854 | sb->journal_tail = cpu_to_le64(rdev->journal_tail); |
| 1855 | if (test_bit(Replacement, &rdev->flags)) |
| 1856 | sb->feature_map |= |
| 1857 | cpu_to_le32(MD_FEATURE_REPLACEMENT); |
| 1858 | |
| 1859 | if (mddev->reshape_position != MaxSector) { |
| 1860 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); |
| 1861 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); |
| 1862 | sb->new_layout = cpu_to_le32(mddev->new_layout); |
| 1863 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); |
| 1864 | sb->new_level = cpu_to_le32(mddev->new_level); |
| 1865 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
| 1866 | if (mddev->delta_disks == 0 && |
| 1867 | mddev->reshape_backwards) |
| 1868 | sb->feature_map |
| 1869 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); |
| 1870 | if (rdev->new_data_offset != rdev->data_offset) { |
| 1871 | sb->feature_map |
| 1872 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); |
| 1873 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset |
| 1874 | - rdev->data_offset)); |
| 1875 | } |
| 1876 | } |
| 1877 | |
| 1878 | if (mddev_is_clustered(mddev)) |
| 1879 | sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); |
| 1880 | |
| 1881 | if (rdev->badblocks.count == 0) |
| 1882 | /* Nothing to do for bad blocks*/ ; |
| 1883 | else if (sb->bblog_offset == 0) |
| 1884 | /* Cannot record bad blocks on this device */ |
| 1885 | md_error(mddev, rdev); |
| 1886 | else { |
| 1887 | struct badblocks *bb = &rdev->badblocks; |
| 1888 | u64 *bbp = (u64 *)page_address(rdev->bb_page); |
| 1889 | u64 *p = bb->page; |
| 1890 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); |
| 1891 | if (bb->changed) { |
| 1892 | unsigned seq; |
| 1893 | |
| 1894 | retry: |
| 1895 | seq = read_seqbegin(&bb->lock); |
| 1896 | |
| 1897 | memset(bbp, 0xff, PAGE_SIZE); |
| 1898 | |
| 1899 | for (i = 0 ; i < bb->count ; i++) { |
| 1900 | u64 internal_bb = p[i]; |
| 1901 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
| 1902 | | BB_LEN(internal_bb)); |
| 1903 | bbp[i] = cpu_to_le64(store_bb); |
| 1904 | } |
| 1905 | bb->changed = 0; |
| 1906 | if (read_seqretry(&bb->lock, seq)) |
| 1907 | goto retry; |
| 1908 | |
| 1909 | bb->sector = (rdev->sb_start + |
| 1910 | (int)le32_to_cpu(sb->bblog_offset)); |
| 1911 | bb->size = le16_to_cpu(sb->bblog_size); |
| 1912 | } |
| 1913 | } |
| 1914 | |
| 1915 | max_dev = 0; |
| 1916 | rdev_for_each(rdev2, mddev) |
| 1917 | if (rdev2->desc_nr+1 > max_dev) |
| 1918 | max_dev = rdev2->desc_nr+1; |
| 1919 | |
| 1920 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
| 1921 | int bmask; |
| 1922 | sb->max_dev = cpu_to_le32(max_dev); |
| 1923 | rdev->sb_size = max_dev * 2 + 256; |
| 1924 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
| 1925 | if (rdev->sb_size & bmask) |
| 1926 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
| 1927 | } else |
| 1928 | max_dev = le32_to_cpu(sb->max_dev); |
| 1929 | |
| 1930 | for (i=0; i<max_dev;i++) |
| 1931 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); |
| 1932 | |
| 1933 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) |
| 1934 | sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); |
| 1935 | |
| 1936 | if (test_bit(MD_HAS_PPL, &mddev->flags)) { |
| 1937 | if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags)) |
| 1938 | sb->feature_map |= |
| 1939 | cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS); |
| 1940 | else |
| 1941 | sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL); |
| 1942 | sb->ppl.offset = cpu_to_le16(rdev->ppl.offset); |
| 1943 | sb->ppl.size = cpu_to_le16(rdev->ppl.size); |
| 1944 | } |
| 1945 | |
| 1946 | rdev_for_each(rdev2, mddev) { |
| 1947 | i = rdev2->desc_nr; |
| 1948 | if (test_bit(Faulty, &rdev2->flags)) |
| 1949 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); |
| 1950 | else if (test_bit(In_sync, &rdev2->flags)) |
| 1951 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
| 1952 | else if (test_bit(Journal, &rdev2->flags)) |
| 1953 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); |
| 1954 | else if (rdev2->raid_disk >= 0) |
| 1955 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
| 1956 | else |
| 1957 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); |
| 1958 | } |
| 1959 | |
| 1960 | sb->sb_csum = calc_sb_1_csum(sb); |
| 1961 | } |
| 1962 | |
| 1963 | static unsigned long long |
| 1964 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
| 1965 | { |
| 1966 | struct mdp_superblock_1 *sb; |
| 1967 | sector_t max_sectors; |
| 1968 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
| 1969 | return 0; /* component must fit device */ |
| 1970 | if (rdev->data_offset != rdev->new_data_offset) |
| 1971 | return 0; /* too confusing */ |
| 1972 | if (rdev->sb_start < rdev->data_offset) { |
| 1973 | /* minor versions 1 and 2; superblock before data */ |
| 1974 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
| 1975 | max_sectors -= rdev->data_offset; |
| 1976 | if (!num_sectors || num_sectors > max_sectors) |
| 1977 | num_sectors = max_sectors; |
| 1978 | } else if (rdev->mddev->bitmap_info.offset) { |
| 1979 | /* minor version 0 with bitmap we can't move */ |
| 1980 | return 0; |
| 1981 | } else { |
| 1982 | /* minor version 0; superblock after data */ |
| 1983 | sector_t sb_start; |
| 1984 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
| 1985 | sb_start &= ~(sector_t)(4*2 - 1); |
| 1986 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
| 1987 | if (!num_sectors || num_sectors > max_sectors) |
| 1988 | num_sectors = max_sectors; |
| 1989 | rdev->sb_start = sb_start; |
| 1990 | } |
| 1991 | sb = page_address(rdev->sb_page); |
| 1992 | sb->data_size = cpu_to_le64(num_sectors); |
| 1993 | sb->super_offset = cpu_to_le64(rdev->sb_start); |
| 1994 | sb->sb_csum = calc_sb_1_csum(sb); |
| 1995 | do { |
| 1996 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
| 1997 | rdev->sb_page); |
| 1998 | } while (md_super_wait(rdev->mddev) < 0); |
| 1999 | return num_sectors; |
| 2000 | |
| 2001 | } |
| 2002 | |
| 2003 | static int |
| 2004 | super_1_allow_new_offset(struct md_rdev *rdev, |
| 2005 | unsigned long long new_offset) |
| 2006 | { |
| 2007 | /* All necessary checks on new >= old have been done */ |
| 2008 | struct bitmap *bitmap; |
| 2009 | if (new_offset >= rdev->data_offset) |
| 2010 | return 1; |
| 2011 | |
| 2012 | /* with 1.0 metadata, there is no metadata to tread on |
| 2013 | * so we can always move back */ |
| 2014 | if (rdev->mddev->minor_version == 0) |
| 2015 | return 1; |
| 2016 | |
| 2017 | /* otherwise we must be sure not to step on |
| 2018 | * any metadata, so stay: |
| 2019 | * 36K beyond start of superblock |
| 2020 | * beyond end of badblocks |
| 2021 | * beyond write-intent bitmap |
| 2022 | */ |
| 2023 | if (rdev->sb_start + (32+4)*2 > new_offset) |
| 2024 | return 0; |
| 2025 | bitmap = rdev->mddev->bitmap; |
| 2026 | if (bitmap && !rdev->mddev->bitmap_info.file && |
| 2027 | rdev->sb_start + rdev->mddev->bitmap_info.offset + |
| 2028 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
| 2029 | return 0; |
| 2030 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) |
| 2031 | return 0; |
| 2032 | |
| 2033 | return 1; |
| 2034 | } |
| 2035 | |
| 2036 | static struct super_type super_types[] = { |
| 2037 | [0] = { |
| 2038 | .name = "0.90.0", |
| 2039 | .owner = THIS_MODULE, |
| 2040 | .load_super = super_90_load, |
| 2041 | .validate_super = super_90_validate, |
| 2042 | .sync_super = super_90_sync, |
| 2043 | .rdev_size_change = super_90_rdev_size_change, |
| 2044 | .allow_new_offset = super_90_allow_new_offset, |
| 2045 | }, |
| 2046 | [1] = { |
| 2047 | .name = "md-1", |
| 2048 | .owner = THIS_MODULE, |
| 2049 | .load_super = super_1_load, |
| 2050 | .validate_super = super_1_validate, |
| 2051 | .sync_super = super_1_sync, |
| 2052 | .rdev_size_change = super_1_rdev_size_change, |
| 2053 | .allow_new_offset = super_1_allow_new_offset, |
| 2054 | }, |
| 2055 | }; |
| 2056 | |
| 2057 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
| 2058 | { |
| 2059 | if (mddev->sync_super) { |
| 2060 | mddev->sync_super(mddev, rdev); |
| 2061 | return; |
| 2062 | } |
| 2063 | |
| 2064 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); |
| 2065 | |
| 2066 | super_types[mddev->major_version].sync_super(mddev, rdev); |
| 2067 | } |
| 2068 | |
| 2069 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
| 2070 | { |
| 2071 | struct md_rdev *rdev, *rdev2; |
| 2072 | |
| 2073 | rcu_read_lock(); |
| 2074 | rdev_for_each_rcu(rdev, mddev1) { |
| 2075 | if (test_bit(Faulty, &rdev->flags) || |
| 2076 | test_bit(Journal, &rdev->flags) || |
| 2077 | rdev->raid_disk == -1) |
| 2078 | continue; |
| 2079 | rdev_for_each_rcu(rdev2, mddev2) { |
| 2080 | if (test_bit(Faulty, &rdev2->flags) || |
| 2081 | test_bit(Journal, &rdev2->flags) || |
| 2082 | rdev2->raid_disk == -1) |
| 2083 | continue; |
| 2084 | if (rdev->bdev->bd_contains == |
| 2085 | rdev2->bdev->bd_contains) { |
| 2086 | rcu_read_unlock(); |
| 2087 | return 1; |
| 2088 | } |
| 2089 | } |
| 2090 | } |
| 2091 | rcu_read_unlock(); |
| 2092 | return 0; |
| 2093 | } |
| 2094 | |
| 2095 | static LIST_HEAD(pending_raid_disks); |
| 2096 | |
| 2097 | /* |
| 2098 | * Try to register data integrity profile for an mddev |
| 2099 | * |
| 2100 | * This is called when an array is started and after a disk has been kicked |
| 2101 | * from the array. It only succeeds if all working and active component devices |
| 2102 | * are integrity capable with matching profiles. |
| 2103 | */ |
| 2104 | int md_integrity_register(struct mddev *mddev) |
| 2105 | { |
| 2106 | struct md_rdev *rdev, *reference = NULL; |
| 2107 | |
| 2108 | if (list_empty(&mddev->disks)) |
| 2109 | return 0; /* nothing to do */ |
| 2110 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
| 2111 | return 0; /* shouldn't register, or already is */ |
| 2112 | rdev_for_each(rdev, mddev) { |
| 2113 | /* skip spares and non-functional disks */ |
| 2114 | if (test_bit(Faulty, &rdev->flags)) |
| 2115 | continue; |
| 2116 | if (rdev->raid_disk < 0) |
| 2117 | continue; |
| 2118 | if (!reference) { |
| 2119 | /* Use the first rdev as the reference */ |
| 2120 | reference = rdev; |
| 2121 | continue; |
| 2122 | } |
| 2123 | /* does this rdev's profile match the reference profile? */ |
| 2124 | if (blk_integrity_compare(reference->bdev->bd_disk, |
| 2125 | rdev->bdev->bd_disk) < 0) |
| 2126 | return -EINVAL; |
| 2127 | } |
| 2128 | if (!reference || !bdev_get_integrity(reference->bdev)) |
| 2129 | return 0; |
| 2130 | /* |
| 2131 | * All component devices are integrity capable and have matching |
| 2132 | * profiles, register the common profile for the md device. |
| 2133 | */ |
| 2134 | blk_integrity_register(mddev->gendisk, |
| 2135 | bdev_get_integrity(reference->bdev)); |
| 2136 | |
| 2137 | pr_debug("md: data integrity enabled on %s\n", mdname(mddev)); |
| 2138 | if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) { |
| 2139 | pr_err("md: failed to create integrity pool for %s\n", |
| 2140 | mdname(mddev)); |
| 2141 | return -EINVAL; |
| 2142 | } |
| 2143 | return 0; |
| 2144 | } |
| 2145 | EXPORT_SYMBOL(md_integrity_register); |
| 2146 | |
| 2147 | /* |
| 2148 | * Attempt to add an rdev, but only if it is consistent with the current |
| 2149 | * integrity profile |
| 2150 | */ |
| 2151 | int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
| 2152 | { |
| 2153 | struct blk_integrity *bi_rdev; |
| 2154 | struct blk_integrity *bi_mddev; |
| 2155 | char name[BDEVNAME_SIZE]; |
| 2156 | |
| 2157 | if (!mddev->gendisk) |
| 2158 | return 0; |
| 2159 | |
| 2160 | bi_rdev = bdev_get_integrity(rdev->bdev); |
| 2161 | bi_mddev = blk_get_integrity(mddev->gendisk); |
| 2162 | |
| 2163 | if (!bi_mddev) /* nothing to do */ |
| 2164 | return 0; |
| 2165 | |
| 2166 | if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) { |
| 2167 | pr_err("%s: incompatible integrity profile for %s\n", |
| 2168 | mdname(mddev), bdevname(rdev->bdev, name)); |
| 2169 | return -ENXIO; |
| 2170 | } |
| 2171 | |
| 2172 | return 0; |
| 2173 | } |
| 2174 | EXPORT_SYMBOL(md_integrity_add_rdev); |
| 2175 | |
| 2176 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
| 2177 | { |
| 2178 | char b[BDEVNAME_SIZE]; |
| 2179 | struct kobject *ko; |
| 2180 | int err; |
| 2181 | |
| 2182 | /* prevent duplicates */ |
| 2183 | if (find_rdev(mddev, rdev->bdev->bd_dev)) |
| 2184 | return -EEXIST; |
| 2185 | |
| 2186 | if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) && |
| 2187 | mddev->pers) |
| 2188 | return -EROFS; |
| 2189 | |
| 2190 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
| 2191 | if (!test_bit(Journal, &rdev->flags) && |
| 2192 | rdev->sectors && |
| 2193 | (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) { |
| 2194 | if (mddev->pers) { |
| 2195 | /* Cannot change size, so fail |
| 2196 | * If mddev->level <= 0, then we don't care |
| 2197 | * about aligning sizes (e.g. linear) |
| 2198 | */ |
| 2199 | if (mddev->level > 0) |
| 2200 | return -ENOSPC; |
| 2201 | } else |
| 2202 | mddev->dev_sectors = rdev->sectors; |
| 2203 | } |
| 2204 | |
| 2205 | /* Verify rdev->desc_nr is unique. |
| 2206 | * If it is -1, assign a free number, else |
| 2207 | * check number is not in use |
| 2208 | */ |
| 2209 | rcu_read_lock(); |
| 2210 | if (rdev->desc_nr < 0) { |
| 2211 | int choice = 0; |
| 2212 | if (mddev->pers) |
| 2213 | choice = mddev->raid_disks; |
| 2214 | while (md_find_rdev_nr_rcu(mddev, choice)) |
| 2215 | choice++; |
| 2216 | rdev->desc_nr = choice; |
| 2217 | } else { |
| 2218 | if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
| 2219 | rcu_read_unlock(); |
| 2220 | return -EBUSY; |
| 2221 | } |
| 2222 | } |
| 2223 | rcu_read_unlock(); |
| 2224 | if (!test_bit(Journal, &rdev->flags) && |
| 2225 | mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
| 2226 | pr_warn("md: %s: array is limited to %d devices\n", |
| 2227 | mdname(mddev), mddev->max_disks); |
| 2228 | return -EBUSY; |
| 2229 | } |
| 2230 | bdevname(rdev->bdev,b); |
| 2231 | strreplace(b, '/', '!'); |
| 2232 | |
| 2233 | rdev->mddev = mddev; |
| 2234 | pr_debug("md: bind<%s>\n", b); |
| 2235 | |
| 2236 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
| 2237 | goto fail; |
| 2238 | |
| 2239 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
| 2240 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
| 2241 | /* failure here is OK */; |
| 2242 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); |
| 2243 | |
| 2244 | list_add_rcu(&rdev->same_set, &mddev->disks); |
| 2245 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
| 2246 | |
| 2247 | /* May as well allow recovery to be retried once */ |
| 2248 | mddev->recovery_disabled++; |
| 2249 | |
| 2250 | return 0; |
| 2251 | |
| 2252 | fail: |
| 2253 | pr_warn("md: failed to register dev-%s for %s\n", |
| 2254 | b, mdname(mddev)); |
| 2255 | return err; |
| 2256 | } |
| 2257 | |
| 2258 | static void md_delayed_delete(struct work_struct *ws) |
| 2259 | { |
| 2260 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
| 2261 | kobject_del(&rdev->kobj); |
| 2262 | kobject_put(&rdev->kobj); |
| 2263 | } |
| 2264 | |
| 2265 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
| 2266 | { |
| 2267 | char b[BDEVNAME_SIZE]; |
| 2268 | |
| 2269 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
| 2270 | list_del_rcu(&rdev->same_set); |
| 2271 | pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
| 2272 | rdev->mddev = NULL; |
| 2273 | sysfs_remove_link(&rdev->kobj, "block"); |
| 2274 | sysfs_put(rdev->sysfs_state); |
| 2275 | rdev->sysfs_state = NULL; |
| 2276 | rdev->badblocks.count = 0; |
| 2277 | /* We need to delay this, otherwise we can deadlock when |
| 2278 | * writing to 'remove' to "dev/state". We also need |
| 2279 | * to delay it due to rcu usage. |
| 2280 | */ |
| 2281 | synchronize_rcu(); |
| 2282 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
| 2283 | kobject_get(&rdev->kobj); |
| 2284 | queue_work(md_misc_wq, &rdev->del_work); |
| 2285 | } |
| 2286 | |
| 2287 | /* |
| 2288 | * prevent the device from being mounted, repartitioned or |
| 2289 | * otherwise reused by a RAID array (or any other kernel |
| 2290 | * subsystem), by bd_claiming the device. |
| 2291 | */ |
| 2292 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
| 2293 | { |
| 2294 | int err = 0; |
| 2295 | struct block_device *bdev; |
| 2296 | char b[BDEVNAME_SIZE]; |
| 2297 | |
| 2298 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
| 2299 | shared ? (struct md_rdev *)lock_rdev : rdev); |
| 2300 | if (IS_ERR(bdev)) { |
| 2301 | pr_warn("md: could not open %s.\n", __bdevname(dev, b)); |
| 2302 | return PTR_ERR(bdev); |
| 2303 | } |
| 2304 | rdev->bdev = bdev; |
| 2305 | return err; |
| 2306 | } |
| 2307 | |
| 2308 | static void unlock_rdev(struct md_rdev *rdev) |
| 2309 | { |
| 2310 | struct block_device *bdev = rdev->bdev; |
| 2311 | rdev->bdev = NULL; |
| 2312 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
| 2313 | } |
| 2314 | |
| 2315 | void md_autodetect_dev(dev_t dev); |
| 2316 | |
| 2317 | static void export_rdev(struct md_rdev *rdev) |
| 2318 | { |
| 2319 | char b[BDEVNAME_SIZE]; |
| 2320 | |
| 2321 | pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b)); |
| 2322 | md_rdev_clear(rdev); |
| 2323 | #ifndef MODULE |
| 2324 | if (test_bit(AutoDetected, &rdev->flags)) |
| 2325 | md_autodetect_dev(rdev->bdev->bd_dev); |
| 2326 | #endif |
| 2327 | unlock_rdev(rdev); |
| 2328 | kobject_put(&rdev->kobj); |
| 2329 | } |
| 2330 | |
| 2331 | void md_kick_rdev_from_array(struct md_rdev *rdev) |
| 2332 | { |
| 2333 | unbind_rdev_from_array(rdev); |
| 2334 | export_rdev(rdev); |
| 2335 | } |
| 2336 | EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); |
| 2337 | |
| 2338 | static void export_array(struct mddev *mddev) |
| 2339 | { |
| 2340 | struct md_rdev *rdev; |
| 2341 | |
| 2342 | while (!list_empty(&mddev->disks)) { |
| 2343 | rdev = list_first_entry(&mddev->disks, struct md_rdev, |
| 2344 | same_set); |
| 2345 | md_kick_rdev_from_array(rdev); |
| 2346 | } |
| 2347 | mddev->raid_disks = 0; |
| 2348 | mddev->major_version = 0; |
| 2349 | } |
| 2350 | |
| 2351 | static bool set_in_sync(struct mddev *mddev) |
| 2352 | { |
| 2353 | lockdep_assert_held(&mddev->lock); |
| 2354 | if (!mddev->in_sync) { |
| 2355 | mddev->sync_checkers++; |
| 2356 | spin_unlock(&mddev->lock); |
| 2357 | percpu_ref_switch_to_atomic_sync(&mddev->writes_pending); |
| 2358 | spin_lock(&mddev->lock); |
| 2359 | if (!mddev->in_sync && |
| 2360 | percpu_ref_is_zero(&mddev->writes_pending)) { |
| 2361 | mddev->in_sync = 1; |
| 2362 | /* |
| 2363 | * Ensure ->in_sync is visible before we clear |
| 2364 | * ->sync_checkers. |
| 2365 | */ |
| 2366 | smp_mb(); |
| 2367 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
| 2368 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 2369 | } |
| 2370 | if (--mddev->sync_checkers == 0) |
| 2371 | percpu_ref_switch_to_percpu(&mddev->writes_pending); |
| 2372 | } |
| 2373 | if (mddev->safemode == 1) |
| 2374 | mddev->safemode = 0; |
| 2375 | return mddev->in_sync; |
| 2376 | } |
| 2377 | |
| 2378 | static void sync_sbs(struct mddev *mddev, int nospares) |
| 2379 | { |
| 2380 | /* Update each superblock (in-memory image), but |
| 2381 | * if we are allowed to, skip spares which already |
| 2382 | * have the right event counter, or have one earlier |
| 2383 | * (which would mean they aren't being marked as dirty |
| 2384 | * with the rest of the array) |
| 2385 | */ |
| 2386 | struct md_rdev *rdev; |
| 2387 | rdev_for_each(rdev, mddev) { |
| 2388 | if (rdev->sb_events == mddev->events || |
| 2389 | (nospares && |
| 2390 | rdev->raid_disk < 0 && |
| 2391 | rdev->sb_events+1 == mddev->events)) { |
| 2392 | /* Don't update this superblock */ |
| 2393 | rdev->sb_loaded = 2; |
| 2394 | } else { |
| 2395 | sync_super(mddev, rdev); |
| 2396 | rdev->sb_loaded = 1; |
| 2397 | } |
| 2398 | } |
| 2399 | } |
| 2400 | |
| 2401 | static bool does_sb_need_changing(struct mddev *mddev) |
| 2402 | { |
| 2403 | struct md_rdev *rdev; |
| 2404 | struct mdp_superblock_1 *sb; |
| 2405 | int role; |
| 2406 | |
| 2407 | /* Find a good rdev */ |
| 2408 | rdev_for_each(rdev, mddev) |
| 2409 | if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) |
| 2410 | break; |
| 2411 | |
| 2412 | /* No good device found. */ |
| 2413 | if (!rdev) |
| 2414 | return false; |
| 2415 | |
| 2416 | sb = page_address(rdev->sb_page); |
| 2417 | /* Check if a device has become faulty or a spare become active */ |
| 2418 | rdev_for_each(rdev, mddev) { |
| 2419 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
| 2420 | /* Device activated? */ |
| 2421 | if (role == 0xffff && rdev->raid_disk >=0 && |
| 2422 | !test_bit(Faulty, &rdev->flags)) |
| 2423 | return true; |
| 2424 | /* Device turned faulty? */ |
| 2425 | if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) |
| 2426 | return true; |
| 2427 | } |
| 2428 | |
| 2429 | /* Check if any mddev parameters have changed */ |
| 2430 | if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || |
| 2431 | (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || |
| 2432 | (mddev->layout != le32_to_cpu(sb->layout)) || |
| 2433 | (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || |
| 2434 | (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) |
| 2435 | return true; |
| 2436 | |
| 2437 | return false; |
| 2438 | } |
| 2439 | |
| 2440 | void md_update_sb(struct mddev *mddev, int force_change) |
| 2441 | { |
| 2442 | struct md_rdev *rdev; |
| 2443 | int sync_req; |
| 2444 | int nospares = 0; |
| 2445 | int any_badblocks_changed = 0; |
| 2446 | int ret = -1; |
| 2447 | |
| 2448 | if (mddev->ro) { |
| 2449 | if (force_change) |
| 2450 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 2451 | return; |
| 2452 | } |
| 2453 | |
| 2454 | repeat: |
| 2455 | if (mddev_is_clustered(mddev)) { |
| 2456 | if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) |
| 2457 | force_change = 1; |
| 2458 | if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) |
| 2459 | nospares = 1; |
| 2460 | ret = md_cluster_ops->metadata_update_start(mddev); |
| 2461 | /* Has someone else has updated the sb */ |
| 2462 | if (!does_sb_need_changing(mddev)) { |
| 2463 | if (ret == 0) |
| 2464 | md_cluster_ops->metadata_update_cancel(mddev); |
| 2465 | bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), |
| 2466 | BIT(MD_SB_CHANGE_DEVS) | |
| 2467 | BIT(MD_SB_CHANGE_CLEAN)); |
| 2468 | return; |
| 2469 | } |
| 2470 | } |
| 2471 | |
| 2472 | /* |
| 2473 | * First make sure individual recovery_offsets are correct |
| 2474 | * curr_resync_completed can only be used during recovery. |
| 2475 | * During reshape/resync it might use array-addresses rather |
| 2476 | * that device addresses. |
| 2477 | */ |
| 2478 | rdev_for_each(rdev, mddev) { |
| 2479 | if (rdev->raid_disk >= 0 && |
| 2480 | mddev->delta_disks >= 0 && |
| 2481 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
| 2482 | test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) && |
| 2483 | !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| 2484 | !test_bit(Journal, &rdev->flags) && |
| 2485 | !test_bit(In_sync, &rdev->flags) && |
| 2486 | mddev->curr_resync_completed > rdev->recovery_offset) |
| 2487 | rdev->recovery_offset = mddev->curr_resync_completed; |
| 2488 | |
| 2489 | } |
| 2490 | if (!mddev->persistent) { |
| 2491 | clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
| 2492 | clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 2493 | if (!mddev->external) { |
| 2494 | clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
| 2495 | rdev_for_each(rdev, mddev) { |
| 2496 | if (rdev->badblocks.changed) { |
| 2497 | rdev->badblocks.changed = 0; |
| 2498 | ack_all_badblocks(&rdev->badblocks); |
| 2499 | md_error(mddev, rdev); |
| 2500 | } |
| 2501 | clear_bit(Blocked, &rdev->flags); |
| 2502 | clear_bit(BlockedBadBlocks, &rdev->flags); |
| 2503 | wake_up(&rdev->blocked_wait); |
| 2504 | } |
| 2505 | } |
| 2506 | wake_up(&mddev->sb_wait); |
| 2507 | return; |
| 2508 | } |
| 2509 | |
| 2510 | spin_lock(&mddev->lock); |
| 2511 | |
| 2512 | mddev->utime = ktime_get_real_seconds(); |
| 2513 | |
| 2514 | if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) |
| 2515 | force_change = 1; |
| 2516 | if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) |
| 2517 | /* just a clean<-> dirty transition, possibly leave spares alone, |
| 2518 | * though if events isn't the right even/odd, we will have to do |
| 2519 | * spares after all |
| 2520 | */ |
| 2521 | nospares = 1; |
| 2522 | if (force_change) |
| 2523 | nospares = 0; |
| 2524 | if (mddev->degraded) |
| 2525 | /* If the array is degraded, then skipping spares is both |
| 2526 | * dangerous and fairly pointless. |
| 2527 | * Dangerous because a device that was removed from the array |
| 2528 | * might have a event_count that still looks up-to-date, |
| 2529 | * so it can be re-added without a resync. |
| 2530 | * Pointless because if there are any spares to skip, |
| 2531 | * then a recovery will happen and soon that array won't |
| 2532 | * be degraded any more and the spare can go back to sleep then. |
| 2533 | */ |
| 2534 | nospares = 0; |
| 2535 | |
| 2536 | sync_req = mddev->in_sync; |
| 2537 | |
| 2538 | /* If this is just a dirty<->clean transition, and the array is clean |
| 2539 | * and 'events' is odd, we can roll back to the previous clean state */ |
| 2540 | if (nospares |
| 2541 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
| 2542 | && mddev->can_decrease_events |
| 2543 | && mddev->events != 1) { |
| 2544 | mddev->events--; |
| 2545 | mddev->can_decrease_events = 0; |
| 2546 | } else { |
| 2547 | /* otherwise we have to go forward and ... */ |
| 2548 | mddev->events ++; |
| 2549 | mddev->can_decrease_events = nospares; |
| 2550 | } |
| 2551 | |
| 2552 | /* |
| 2553 | * This 64-bit counter should never wrap. |
| 2554 | * Either we are in around ~1 trillion A.C., assuming |
| 2555 | * 1 reboot per second, or we have a bug... |
| 2556 | */ |
| 2557 | WARN_ON(mddev->events == 0); |
| 2558 | |
| 2559 | rdev_for_each(rdev, mddev) { |
| 2560 | if (rdev->badblocks.changed) |
| 2561 | any_badblocks_changed++; |
| 2562 | if (test_bit(Faulty, &rdev->flags)) |
| 2563 | set_bit(FaultRecorded, &rdev->flags); |
| 2564 | } |
| 2565 | |
| 2566 | sync_sbs(mddev, nospares); |
| 2567 | spin_unlock(&mddev->lock); |
| 2568 | |
| 2569 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
| 2570 | mdname(mddev), mddev->in_sync); |
| 2571 | |
| 2572 | if (mddev->queue) |
| 2573 | blk_add_trace_msg(mddev->queue, "md md_update_sb"); |
| 2574 | rewrite: |
| 2575 | bitmap_update_sb(mddev->bitmap); |
| 2576 | rdev_for_each(rdev, mddev) { |
| 2577 | char b[BDEVNAME_SIZE]; |
| 2578 | |
| 2579 | if (rdev->sb_loaded != 1) |
| 2580 | continue; /* no noise on spare devices */ |
| 2581 | |
| 2582 | if (!test_bit(Faulty, &rdev->flags)) { |
| 2583 | md_super_write(mddev,rdev, |
| 2584 | rdev->sb_start, rdev->sb_size, |
| 2585 | rdev->sb_page); |
| 2586 | pr_debug("md: (write) %s's sb offset: %llu\n", |
| 2587 | bdevname(rdev->bdev, b), |
| 2588 | (unsigned long long)rdev->sb_start); |
| 2589 | rdev->sb_events = mddev->events; |
| 2590 | if (rdev->badblocks.size) { |
| 2591 | md_super_write(mddev, rdev, |
| 2592 | rdev->badblocks.sector, |
| 2593 | rdev->badblocks.size << 9, |
| 2594 | rdev->bb_page); |
| 2595 | rdev->badblocks.size = 0; |
| 2596 | } |
| 2597 | |
| 2598 | } else |
| 2599 | pr_debug("md: %s (skipping faulty)\n", |
| 2600 | bdevname(rdev->bdev, b)); |
| 2601 | |
| 2602 | if (mddev->level == LEVEL_MULTIPATH) |
| 2603 | /* only need to write one superblock... */ |
| 2604 | break; |
| 2605 | } |
| 2606 | if (md_super_wait(mddev) < 0) |
| 2607 | goto rewrite; |
| 2608 | /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */ |
| 2609 | |
| 2610 | if (mddev_is_clustered(mddev) && ret == 0) |
| 2611 | md_cluster_ops->metadata_update_finish(mddev); |
| 2612 | |
| 2613 | if (mddev->in_sync != sync_req || |
| 2614 | !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), |
| 2615 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN))) |
| 2616 | /* have to write it out again */ |
| 2617 | goto repeat; |
| 2618 | wake_up(&mddev->sb_wait); |
| 2619 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 2620 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| 2621 | |
| 2622 | rdev_for_each(rdev, mddev) { |
| 2623 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
| 2624 | clear_bit(Blocked, &rdev->flags); |
| 2625 | |
| 2626 | if (any_badblocks_changed) |
| 2627 | ack_all_badblocks(&rdev->badblocks); |
| 2628 | clear_bit(BlockedBadBlocks, &rdev->flags); |
| 2629 | wake_up(&rdev->blocked_wait); |
| 2630 | } |
| 2631 | } |
| 2632 | EXPORT_SYMBOL(md_update_sb); |
| 2633 | |
| 2634 | static int add_bound_rdev(struct md_rdev *rdev) |
| 2635 | { |
| 2636 | struct mddev *mddev = rdev->mddev; |
| 2637 | int err = 0; |
| 2638 | bool add_journal = test_bit(Journal, &rdev->flags); |
| 2639 | |
| 2640 | if (!mddev->pers->hot_remove_disk || add_journal) { |
| 2641 | /* If there is hot_add_disk but no hot_remove_disk |
| 2642 | * then added disks for geometry changes, |
| 2643 | * and should be added immediately. |
| 2644 | */ |
| 2645 | super_types[mddev->major_version]. |
| 2646 | validate_super(mddev, rdev); |
| 2647 | if (add_journal) |
| 2648 | mddev_suspend(mddev); |
| 2649 | err = mddev->pers->hot_add_disk(mddev, rdev); |
| 2650 | if (add_journal) |
| 2651 | mddev_resume(mddev); |
| 2652 | if (err) { |
| 2653 | md_kick_rdev_from_array(rdev); |
| 2654 | return err; |
| 2655 | } |
| 2656 | } |
| 2657 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
| 2658 | |
| 2659 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 2660 | if (mddev->degraded) |
| 2661 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 2662 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 2663 | md_new_event(mddev); |
| 2664 | md_wakeup_thread(mddev->thread); |
| 2665 | return 0; |
| 2666 | } |
| 2667 | |
| 2668 | /* words written to sysfs files may, or may not, be \n terminated. |
| 2669 | * We want to accept with case. For this we use cmd_match. |
| 2670 | */ |
| 2671 | static int cmd_match(const char *cmd, const char *str) |
| 2672 | { |
| 2673 | /* See if cmd, written into a sysfs file, matches |
| 2674 | * str. They must either be the same, or cmd can |
| 2675 | * have a trailing newline |
| 2676 | */ |
| 2677 | while (*cmd && *str && *cmd == *str) { |
| 2678 | cmd++; |
| 2679 | str++; |
| 2680 | } |
| 2681 | if (*cmd == '\n') |
| 2682 | cmd++; |
| 2683 | if (*str || *cmd) |
| 2684 | return 0; |
| 2685 | return 1; |
| 2686 | } |
| 2687 | |
| 2688 | struct rdev_sysfs_entry { |
| 2689 | struct attribute attr; |
| 2690 | ssize_t (*show)(struct md_rdev *, char *); |
| 2691 | ssize_t (*store)(struct md_rdev *, const char *, size_t); |
| 2692 | }; |
| 2693 | |
| 2694 | static ssize_t |
| 2695 | state_show(struct md_rdev *rdev, char *page) |
| 2696 | { |
| 2697 | char *sep = ","; |
| 2698 | size_t len = 0; |
| 2699 | unsigned long flags = READ_ONCE(rdev->flags); |
| 2700 | |
| 2701 | if (test_bit(Faulty, &flags) || |
| 2702 | (!test_bit(ExternalBbl, &flags) && |
| 2703 | rdev->badblocks.unacked_exist)) |
| 2704 | len += sprintf(page+len, "faulty%s", sep); |
| 2705 | if (test_bit(In_sync, &flags)) |
| 2706 | len += sprintf(page+len, "in_sync%s", sep); |
| 2707 | if (test_bit(Journal, &flags)) |
| 2708 | len += sprintf(page+len, "journal%s", sep); |
| 2709 | if (test_bit(WriteMostly, &flags)) |
| 2710 | len += sprintf(page+len, "write_mostly%s", sep); |
| 2711 | if (test_bit(Blocked, &flags) || |
| 2712 | (rdev->badblocks.unacked_exist |
| 2713 | && !test_bit(Faulty, &flags))) |
| 2714 | len += sprintf(page+len, "blocked%s", sep); |
| 2715 | if (!test_bit(Faulty, &flags) && |
| 2716 | !test_bit(Journal, &flags) && |
| 2717 | !test_bit(In_sync, &flags)) |
| 2718 | len += sprintf(page+len, "spare%s", sep); |
| 2719 | if (test_bit(WriteErrorSeen, &flags)) |
| 2720 | len += sprintf(page+len, "write_error%s", sep); |
| 2721 | if (test_bit(WantReplacement, &flags)) |
| 2722 | len += sprintf(page+len, "want_replacement%s", sep); |
| 2723 | if (test_bit(Replacement, &flags)) |
| 2724 | len += sprintf(page+len, "replacement%s", sep); |
| 2725 | if (test_bit(ExternalBbl, &flags)) |
| 2726 | len += sprintf(page+len, "external_bbl%s", sep); |
| 2727 | if (test_bit(FailFast, &flags)) |
| 2728 | len += sprintf(page+len, "failfast%s", sep); |
| 2729 | |
| 2730 | if (len) |
| 2731 | len -= strlen(sep); |
| 2732 | |
| 2733 | return len+sprintf(page+len, "\n"); |
| 2734 | } |
| 2735 | |
| 2736 | static ssize_t |
| 2737 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
| 2738 | { |
| 2739 | /* can write |
| 2740 | * faulty - simulates an error |
| 2741 | * remove - disconnects the device |
| 2742 | * writemostly - sets write_mostly |
| 2743 | * -writemostly - clears write_mostly |
| 2744 | * blocked - sets the Blocked flags |
| 2745 | * -blocked - clears the Blocked and possibly simulates an error |
| 2746 | * insync - sets Insync providing device isn't active |
| 2747 | * -insync - clear Insync for a device with a slot assigned, |
| 2748 | * so that it gets rebuilt based on bitmap |
| 2749 | * write_error - sets WriteErrorSeen |
| 2750 | * -write_error - clears WriteErrorSeen |
| 2751 | * {,-}failfast - set/clear FailFast |
| 2752 | */ |
| 2753 | int err = -EINVAL; |
| 2754 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { |
| 2755 | md_error(rdev->mddev, rdev); |
| 2756 | if (test_bit(Faulty, &rdev->flags)) |
| 2757 | err = 0; |
| 2758 | else |
| 2759 | err = -EBUSY; |
| 2760 | } else if (cmd_match(buf, "remove")) { |
| 2761 | if (rdev->mddev->pers) { |
| 2762 | clear_bit(Blocked, &rdev->flags); |
| 2763 | remove_and_add_spares(rdev->mddev, rdev); |
| 2764 | } |
| 2765 | if (rdev->raid_disk >= 0) |
| 2766 | err = -EBUSY; |
| 2767 | else { |
| 2768 | struct mddev *mddev = rdev->mddev; |
| 2769 | err = 0; |
| 2770 | if (mddev_is_clustered(mddev)) |
| 2771 | err = md_cluster_ops->remove_disk(mddev, rdev); |
| 2772 | |
| 2773 | if (err == 0) { |
| 2774 | md_kick_rdev_from_array(rdev); |
| 2775 | if (mddev->pers) { |
| 2776 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 2777 | md_wakeup_thread(mddev->thread); |
| 2778 | } |
| 2779 | md_new_event(mddev); |
| 2780 | } |
| 2781 | } |
| 2782 | } else if (cmd_match(buf, "writemostly")) { |
| 2783 | set_bit(WriteMostly, &rdev->flags); |
| 2784 | err = 0; |
| 2785 | } else if (cmd_match(buf, "-writemostly")) { |
| 2786 | clear_bit(WriteMostly, &rdev->flags); |
| 2787 | err = 0; |
| 2788 | } else if (cmd_match(buf, "blocked")) { |
| 2789 | set_bit(Blocked, &rdev->flags); |
| 2790 | err = 0; |
| 2791 | } else if (cmd_match(buf, "-blocked")) { |
| 2792 | if (!test_bit(Faulty, &rdev->flags) && |
| 2793 | !test_bit(ExternalBbl, &rdev->flags) && |
| 2794 | rdev->badblocks.unacked_exist) { |
| 2795 | /* metadata handler doesn't understand badblocks, |
| 2796 | * so we need to fail the device |
| 2797 | */ |
| 2798 | md_error(rdev->mddev, rdev); |
| 2799 | } |
| 2800 | clear_bit(Blocked, &rdev->flags); |
| 2801 | clear_bit(BlockedBadBlocks, &rdev->flags); |
| 2802 | wake_up(&rdev->blocked_wait); |
| 2803 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
| 2804 | md_wakeup_thread(rdev->mddev->thread); |
| 2805 | |
| 2806 | err = 0; |
| 2807 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { |
| 2808 | set_bit(In_sync, &rdev->flags); |
| 2809 | err = 0; |
| 2810 | } else if (cmd_match(buf, "failfast")) { |
| 2811 | set_bit(FailFast, &rdev->flags); |
| 2812 | err = 0; |
| 2813 | } else if (cmd_match(buf, "-failfast")) { |
| 2814 | clear_bit(FailFast, &rdev->flags); |
| 2815 | err = 0; |
| 2816 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && |
| 2817 | !test_bit(Journal, &rdev->flags)) { |
| 2818 | if (rdev->mddev->pers == NULL) { |
| 2819 | clear_bit(In_sync, &rdev->flags); |
| 2820 | rdev->saved_raid_disk = rdev->raid_disk; |
| 2821 | rdev->raid_disk = -1; |
| 2822 | err = 0; |
| 2823 | } |
| 2824 | } else if (cmd_match(buf, "write_error")) { |
| 2825 | set_bit(WriteErrorSeen, &rdev->flags); |
| 2826 | err = 0; |
| 2827 | } else if (cmd_match(buf, "-write_error")) { |
| 2828 | clear_bit(WriteErrorSeen, &rdev->flags); |
| 2829 | err = 0; |
| 2830 | } else if (cmd_match(buf, "want_replacement")) { |
| 2831 | /* Any non-spare device that is not a replacement can |
| 2832 | * become want_replacement at any time, but we then need to |
| 2833 | * check if recovery is needed. |
| 2834 | */ |
| 2835 | if (rdev->raid_disk >= 0 && |
| 2836 | !test_bit(Journal, &rdev->flags) && |
| 2837 | !test_bit(Replacement, &rdev->flags)) |
| 2838 | set_bit(WantReplacement, &rdev->flags); |
| 2839 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
| 2840 | md_wakeup_thread(rdev->mddev->thread); |
| 2841 | err = 0; |
| 2842 | } else if (cmd_match(buf, "-want_replacement")) { |
| 2843 | /* Clearing 'want_replacement' is always allowed. |
| 2844 | * Once replacements starts it is too late though. |
| 2845 | */ |
| 2846 | err = 0; |
| 2847 | clear_bit(WantReplacement, &rdev->flags); |
| 2848 | } else if (cmd_match(buf, "replacement")) { |
| 2849 | /* Can only set a device as a replacement when array has not |
| 2850 | * yet been started. Once running, replacement is automatic |
| 2851 | * from spares, or by assigning 'slot'. |
| 2852 | */ |
| 2853 | if (rdev->mddev->pers) |
| 2854 | err = -EBUSY; |
| 2855 | else { |
| 2856 | set_bit(Replacement, &rdev->flags); |
| 2857 | err = 0; |
| 2858 | } |
| 2859 | } else if (cmd_match(buf, "-replacement")) { |
| 2860 | /* Similarly, can only clear Replacement before start */ |
| 2861 | if (rdev->mddev->pers) |
| 2862 | err = -EBUSY; |
| 2863 | else { |
| 2864 | clear_bit(Replacement, &rdev->flags); |
| 2865 | err = 0; |
| 2866 | } |
| 2867 | } else if (cmd_match(buf, "re-add")) { |
| 2868 | if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) && |
| 2869 | rdev->saved_raid_disk >= 0) { |
| 2870 | /* clear_bit is performed _after_ all the devices |
| 2871 | * have their local Faulty bit cleared. If any writes |
| 2872 | * happen in the meantime in the local node, they |
| 2873 | * will land in the local bitmap, which will be synced |
| 2874 | * by this node eventually |
| 2875 | */ |
| 2876 | if (!mddev_is_clustered(rdev->mddev) || |
| 2877 | (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { |
| 2878 | clear_bit(Faulty, &rdev->flags); |
| 2879 | err = add_bound_rdev(rdev); |
| 2880 | } |
| 2881 | } else |
| 2882 | err = -EBUSY; |
| 2883 | } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) { |
| 2884 | set_bit(ExternalBbl, &rdev->flags); |
| 2885 | rdev->badblocks.shift = 0; |
| 2886 | err = 0; |
| 2887 | } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) { |
| 2888 | clear_bit(ExternalBbl, &rdev->flags); |
| 2889 | err = 0; |
| 2890 | } |
| 2891 | if (!err) |
| 2892 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
| 2893 | return err ? err : len; |
| 2894 | } |
| 2895 | static struct rdev_sysfs_entry rdev_state = |
| 2896 | __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); |
| 2897 | |
| 2898 | static ssize_t |
| 2899 | errors_show(struct md_rdev *rdev, char *page) |
| 2900 | { |
| 2901 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); |
| 2902 | } |
| 2903 | |
| 2904 | static ssize_t |
| 2905 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
| 2906 | { |
| 2907 | unsigned int n; |
| 2908 | int rv; |
| 2909 | |
| 2910 | rv = kstrtouint(buf, 10, &n); |
| 2911 | if (rv < 0) |
| 2912 | return rv; |
| 2913 | atomic_set(&rdev->corrected_errors, n); |
| 2914 | return len; |
| 2915 | } |
| 2916 | static struct rdev_sysfs_entry rdev_errors = |
| 2917 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
| 2918 | |
| 2919 | static ssize_t |
| 2920 | slot_show(struct md_rdev *rdev, char *page) |
| 2921 | { |
| 2922 | if (test_bit(Journal, &rdev->flags)) |
| 2923 | return sprintf(page, "journal\n"); |
| 2924 | else if (rdev->raid_disk < 0) |
| 2925 | return sprintf(page, "none\n"); |
| 2926 | else |
| 2927 | return sprintf(page, "%d\n", rdev->raid_disk); |
| 2928 | } |
| 2929 | |
| 2930 | static ssize_t |
| 2931 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
| 2932 | { |
| 2933 | int slot; |
| 2934 | int err; |
| 2935 | |
| 2936 | if (test_bit(Journal, &rdev->flags)) |
| 2937 | return -EBUSY; |
| 2938 | if (strncmp(buf, "none", 4)==0) |
| 2939 | slot = -1; |
| 2940 | else { |
| 2941 | err = kstrtouint(buf, 10, (unsigned int *)&slot); |
| 2942 | if (err < 0) |
| 2943 | return err; |
| 2944 | } |
| 2945 | if (rdev->mddev->pers && slot == -1) { |
| 2946 | /* Setting 'slot' on an active array requires also |
| 2947 | * updating the 'rd%d' link, and communicating |
| 2948 | * with the personality with ->hot_*_disk. |
| 2949 | * For now we only support removing |
| 2950 | * failed/spare devices. This normally happens automatically, |
| 2951 | * but not when the metadata is externally managed. |
| 2952 | */ |
| 2953 | if (rdev->raid_disk == -1) |
| 2954 | return -EEXIST; |
| 2955 | /* personality does all needed checks */ |
| 2956 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
| 2957 | return -EINVAL; |
| 2958 | clear_bit(Blocked, &rdev->flags); |
| 2959 | remove_and_add_spares(rdev->mddev, rdev); |
| 2960 | if (rdev->raid_disk >= 0) |
| 2961 | return -EBUSY; |
| 2962 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
| 2963 | md_wakeup_thread(rdev->mddev->thread); |
| 2964 | } else if (rdev->mddev->pers) { |
| 2965 | /* Activating a spare .. or possibly reactivating |
| 2966 | * if we ever get bitmaps working here. |
| 2967 | */ |
| 2968 | int err; |
| 2969 | |
| 2970 | if (rdev->raid_disk != -1) |
| 2971 | return -EBUSY; |
| 2972 | |
| 2973 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
| 2974 | return -EBUSY; |
| 2975 | |
| 2976 | if (rdev->mddev->pers->hot_add_disk == NULL) |
| 2977 | return -EINVAL; |
| 2978 | |
| 2979 | if (slot >= rdev->mddev->raid_disks && |
| 2980 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) |
| 2981 | return -ENOSPC; |
| 2982 | |
| 2983 | rdev->raid_disk = slot; |
| 2984 | if (test_bit(In_sync, &rdev->flags)) |
| 2985 | rdev->saved_raid_disk = slot; |
| 2986 | else |
| 2987 | rdev->saved_raid_disk = -1; |
| 2988 | clear_bit(In_sync, &rdev->flags); |
| 2989 | clear_bit(Bitmap_sync, &rdev->flags); |
| 2990 | err = rdev->mddev->pers-> |
| 2991 | hot_add_disk(rdev->mddev, rdev); |
| 2992 | if (err) { |
| 2993 | rdev->raid_disk = -1; |
| 2994 | return err; |
| 2995 | } else |
| 2996 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
| 2997 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
| 2998 | /* failure here is OK */; |
| 2999 | /* don't wakeup anyone, leave that to userspace. */ |
| 3000 | } else { |
| 3001 | if (slot >= rdev->mddev->raid_disks && |
| 3002 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) |
| 3003 | return -ENOSPC; |
| 3004 | rdev->raid_disk = slot; |
| 3005 | /* assume it is working */ |
| 3006 | clear_bit(Faulty, &rdev->flags); |
| 3007 | clear_bit(WriteMostly, &rdev->flags); |
| 3008 | set_bit(In_sync, &rdev->flags); |
| 3009 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
| 3010 | } |
| 3011 | return len; |
| 3012 | } |
| 3013 | |
| 3014 | static struct rdev_sysfs_entry rdev_slot = |
| 3015 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
| 3016 | |
| 3017 | static ssize_t |
| 3018 | offset_show(struct md_rdev *rdev, char *page) |
| 3019 | { |
| 3020 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
| 3021 | } |
| 3022 | |
| 3023 | static ssize_t |
| 3024 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
| 3025 | { |
| 3026 | unsigned long long offset; |
| 3027 | if (kstrtoull(buf, 10, &offset) < 0) |
| 3028 | return -EINVAL; |
| 3029 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
| 3030 | return -EBUSY; |
| 3031 | if (rdev->sectors && rdev->mddev->external) |
| 3032 | /* Must set offset before size, so overlap checks |
| 3033 | * can be sane */ |
| 3034 | return -EBUSY; |
| 3035 | rdev->data_offset = offset; |
| 3036 | rdev->new_data_offset = offset; |
| 3037 | return len; |
| 3038 | } |
| 3039 | |
| 3040 | static struct rdev_sysfs_entry rdev_offset = |
| 3041 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
| 3042 | |
| 3043 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
| 3044 | { |
| 3045 | return sprintf(page, "%llu\n", |
| 3046 | (unsigned long long)rdev->new_data_offset); |
| 3047 | } |
| 3048 | |
| 3049 | static ssize_t new_offset_store(struct md_rdev *rdev, |
| 3050 | const char *buf, size_t len) |
| 3051 | { |
| 3052 | unsigned long long new_offset; |
| 3053 | struct mddev *mddev = rdev->mddev; |
| 3054 | |
| 3055 | if (kstrtoull(buf, 10, &new_offset) < 0) |
| 3056 | return -EINVAL; |
| 3057 | |
| 3058 | if (mddev->sync_thread || |
| 3059 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) |
| 3060 | return -EBUSY; |
| 3061 | if (new_offset == rdev->data_offset) |
| 3062 | /* reset is always permitted */ |
| 3063 | ; |
| 3064 | else if (new_offset > rdev->data_offset) { |
| 3065 | /* must not push array size beyond rdev_sectors */ |
| 3066 | if (new_offset - rdev->data_offset |
| 3067 | + mddev->dev_sectors > rdev->sectors) |
| 3068 | return -E2BIG; |
| 3069 | } |
| 3070 | /* Metadata worries about other space details. */ |
| 3071 | |
| 3072 | /* decreasing the offset is inconsistent with a backwards |
| 3073 | * reshape. |
| 3074 | */ |
| 3075 | if (new_offset < rdev->data_offset && |
| 3076 | mddev->reshape_backwards) |
| 3077 | return -EINVAL; |
| 3078 | /* Increasing offset is inconsistent with forwards |
| 3079 | * reshape. reshape_direction should be set to |
| 3080 | * 'backwards' first. |
| 3081 | */ |
| 3082 | if (new_offset > rdev->data_offset && |
| 3083 | !mddev->reshape_backwards) |
| 3084 | return -EINVAL; |
| 3085 | |
| 3086 | if (mddev->pers && mddev->persistent && |
| 3087 | !super_types[mddev->major_version] |
| 3088 | .allow_new_offset(rdev, new_offset)) |
| 3089 | return -E2BIG; |
| 3090 | rdev->new_data_offset = new_offset; |
| 3091 | if (new_offset > rdev->data_offset) |
| 3092 | mddev->reshape_backwards = 1; |
| 3093 | else if (new_offset < rdev->data_offset) |
| 3094 | mddev->reshape_backwards = 0; |
| 3095 | |
| 3096 | return len; |
| 3097 | } |
| 3098 | static struct rdev_sysfs_entry rdev_new_offset = |
| 3099 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); |
| 3100 | |
| 3101 | static ssize_t |
| 3102 | rdev_size_show(struct md_rdev *rdev, char *page) |
| 3103 | { |
| 3104 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
| 3105 | } |
| 3106 | |
| 3107 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
| 3108 | { |
| 3109 | /* check if two start/length pairs overlap */ |
| 3110 | if (s1+l1 <= s2) |
| 3111 | return 0; |
| 3112 | if (s2+l2 <= s1) |
| 3113 | return 0; |
| 3114 | return 1; |
| 3115 | } |
| 3116 | |
| 3117 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
| 3118 | { |
| 3119 | unsigned long long blocks; |
| 3120 | sector_t new; |
| 3121 | |
| 3122 | if (kstrtoull(buf, 10, &blocks) < 0) |
| 3123 | return -EINVAL; |
| 3124 | |
| 3125 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) |
| 3126 | return -EINVAL; /* sector conversion overflow */ |
| 3127 | |
| 3128 | new = blocks * 2; |
| 3129 | if (new != blocks * 2) |
| 3130 | return -EINVAL; /* unsigned long long to sector_t overflow */ |
| 3131 | |
| 3132 | *sectors = new; |
| 3133 | return 0; |
| 3134 | } |
| 3135 | |
| 3136 | static ssize_t |
| 3137 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
| 3138 | { |
| 3139 | struct mddev *my_mddev = rdev->mddev; |
| 3140 | sector_t oldsectors = rdev->sectors; |
| 3141 | sector_t sectors; |
| 3142 | |
| 3143 | if (test_bit(Journal, &rdev->flags)) |
| 3144 | return -EBUSY; |
| 3145 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
| 3146 | return -EINVAL; |
| 3147 | if (rdev->data_offset != rdev->new_data_offset) |
| 3148 | return -EINVAL; /* too confusing */ |
| 3149 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
| 3150 | if (my_mddev->persistent) { |
| 3151 | sectors = super_types[my_mddev->major_version]. |
| 3152 | rdev_size_change(rdev, sectors); |
| 3153 | if (!sectors) |
| 3154 | return -EBUSY; |
| 3155 | } else if (!sectors) |
| 3156 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
| 3157 | rdev->data_offset; |
| 3158 | if (!my_mddev->pers->resize) |
| 3159 | /* Cannot change size for RAID0 or Linear etc */ |
| 3160 | return -EINVAL; |
| 3161 | } |
| 3162 | if (sectors < my_mddev->dev_sectors) |
| 3163 | return -EINVAL; /* component must fit device */ |
| 3164 | |
| 3165 | rdev->sectors = sectors; |
| 3166 | if (sectors > oldsectors && my_mddev->external) { |
| 3167 | /* Need to check that all other rdevs with the same |
| 3168 | * ->bdev do not overlap. 'rcu' is sufficient to walk |
| 3169 | * the rdev lists safely. |
| 3170 | * This check does not provide a hard guarantee, it |
| 3171 | * just helps avoid dangerous mistakes. |
| 3172 | */ |
| 3173 | struct mddev *mddev; |
| 3174 | int overlap = 0; |
| 3175 | struct list_head *tmp; |
| 3176 | |
| 3177 | rcu_read_lock(); |
| 3178 | for_each_mddev(mddev, tmp) { |
| 3179 | struct md_rdev *rdev2; |
| 3180 | |
| 3181 | rdev_for_each(rdev2, mddev) |
| 3182 | if (rdev->bdev == rdev2->bdev && |
| 3183 | rdev != rdev2 && |
| 3184 | overlaps(rdev->data_offset, rdev->sectors, |
| 3185 | rdev2->data_offset, |
| 3186 | rdev2->sectors)) { |
| 3187 | overlap = 1; |
| 3188 | break; |
| 3189 | } |
| 3190 | if (overlap) { |
| 3191 | mddev_put(mddev); |
| 3192 | break; |
| 3193 | } |
| 3194 | } |
| 3195 | rcu_read_unlock(); |
| 3196 | if (overlap) { |
| 3197 | /* Someone else could have slipped in a size |
| 3198 | * change here, but doing so is just silly. |
| 3199 | * We put oldsectors back because we *know* it is |
| 3200 | * safe, and trust userspace not to race with |
| 3201 | * itself |
| 3202 | */ |
| 3203 | rdev->sectors = oldsectors; |
| 3204 | return -EBUSY; |
| 3205 | } |
| 3206 | } |
| 3207 | return len; |
| 3208 | } |
| 3209 | |
| 3210 | static struct rdev_sysfs_entry rdev_size = |
| 3211 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
| 3212 | |
| 3213 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
| 3214 | { |
| 3215 | unsigned long long recovery_start = rdev->recovery_offset; |
| 3216 | |
| 3217 | if (test_bit(In_sync, &rdev->flags) || |
| 3218 | recovery_start == MaxSector) |
| 3219 | return sprintf(page, "none\n"); |
| 3220 | |
| 3221 | return sprintf(page, "%llu\n", recovery_start); |
| 3222 | } |
| 3223 | |
| 3224 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
| 3225 | { |
| 3226 | unsigned long long recovery_start; |
| 3227 | |
| 3228 | if (cmd_match(buf, "none")) |
| 3229 | recovery_start = MaxSector; |
| 3230 | else if (kstrtoull(buf, 10, &recovery_start)) |
| 3231 | return -EINVAL; |
| 3232 | |
| 3233 | if (rdev->mddev->pers && |
| 3234 | rdev->raid_disk >= 0) |
| 3235 | return -EBUSY; |
| 3236 | |
| 3237 | rdev->recovery_offset = recovery_start; |
| 3238 | if (recovery_start == MaxSector) |
| 3239 | set_bit(In_sync, &rdev->flags); |
| 3240 | else |
| 3241 | clear_bit(In_sync, &rdev->flags); |
| 3242 | return len; |
| 3243 | } |
| 3244 | |
| 3245 | static struct rdev_sysfs_entry rdev_recovery_start = |
| 3246 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); |
| 3247 | |
| 3248 | /* sysfs access to bad-blocks list. |
| 3249 | * We present two files. |
| 3250 | * 'bad-blocks' lists sector numbers and lengths of ranges that |
| 3251 | * are recorded as bad. The list is truncated to fit within |
| 3252 | * the one-page limit of sysfs. |
| 3253 | * Writing "sector length" to this file adds an acknowledged |
| 3254 | * bad block list. |
| 3255 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet |
| 3256 | * been acknowledged. Writing to this file adds bad blocks |
| 3257 | * without acknowledging them. This is largely for testing. |
| 3258 | */ |
| 3259 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
| 3260 | { |
| 3261 | return badblocks_show(&rdev->badblocks, page, 0); |
| 3262 | } |
| 3263 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
| 3264 | { |
| 3265 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
| 3266 | /* Maybe that ack was all we needed */ |
| 3267 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) |
| 3268 | wake_up(&rdev->blocked_wait); |
| 3269 | return rv; |
| 3270 | } |
| 3271 | static struct rdev_sysfs_entry rdev_bad_blocks = |
| 3272 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); |
| 3273 | |
| 3274 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
| 3275 | { |
| 3276 | return badblocks_show(&rdev->badblocks, page, 1); |
| 3277 | } |
| 3278 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
| 3279 | { |
| 3280 | return badblocks_store(&rdev->badblocks, page, len, 1); |
| 3281 | } |
| 3282 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = |
| 3283 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); |
| 3284 | |
| 3285 | static ssize_t |
| 3286 | ppl_sector_show(struct md_rdev *rdev, char *page) |
| 3287 | { |
| 3288 | return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector); |
| 3289 | } |
| 3290 | |
| 3291 | static ssize_t |
| 3292 | ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len) |
| 3293 | { |
| 3294 | unsigned long long sector; |
| 3295 | |
| 3296 | if (kstrtoull(buf, 10, §or) < 0) |
| 3297 | return -EINVAL; |
| 3298 | if (sector != (sector_t)sector) |
| 3299 | return -EINVAL; |
| 3300 | |
| 3301 | if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && |
| 3302 | rdev->raid_disk >= 0) |
| 3303 | return -EBUSY; |
| 3304 | |
| 3305 | if (rdev->mddev->persistent) { |
| 3306 | if (rdev->mddev->major_version == 0) |
| 3307 | return -EINVAL; |
| 3308 | if ((sector > rdev->sb_start && |
| 3309 | sector - rdev->sb_start > S16_MAX) || |
| 3310 | (sector < rdev->sb_start && |
| 3311 | rdev->sb_start - sector > -S16_MIN)) |
| 3312 | return -EINVAL; |
| 3313 | rdev->ppl.offset = sector - rdev->sb_start; |
| 3314 | } else if (!rdev->mddev->external) { |
| 3315 | return -EBUSY; |
| 3316 | } |
| 3317 | rdev->ppl.sector = sector; |
| 3318 | return len; |
| 3319 | } |
| 3320 | |
| 3321 | static struct rdev_sysfs_entry rdev_ppl_sector = |
| 3322 | __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store); |
| 3323 | |
| 3324 | static ssize_t |
| 3325 | ppl_size_show(struct md_rdev *rdev, char *page) |
| 3326 | { |
| 3327 | return sprintf(page, "%u\n", rdev->ppl.size); |
| 3328 | } |
| 3329 | |
| 3330 | static ssize_t |
| 3331 | ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
| 3332 | { |
| 3333 | unsigned int size; |
| 3334 | |
| 3335 | if (kstrtouint(buf, 10, &size) < 0) |
| 3336 | return -EINVAL; |
| 3337 | |
| 3338 | if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && |
| 3339 | rdev->raid_disk >= 0) |
| 3340 | return -EBUSY; |
| 3341 | |
| 3342 | if (rdev->mddev->persistent) { |
| 3343 | if (rdev->mddev->major_version == 0) |
| 3344 | return -EINVAL; |
| 3345 | if (size > U16_MAX) |
| 3346 | return -EINVAL; |
| 3347 | } else if (!rdev->mddev->external) { |
| 3348 | return -EBUSY; |
| 3349 | } |
| 3350 | rdev->ppl.size = size; |
| 3351 | return len; |
| 3352 | } |
| 3353 | |
| 3354 | static struct rdev_sysfs_entry rdev_ppl_size = |
| 3355 | __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store); |
| 3356 | |
| 3357 | static struct attribute *rdev_default_attrs[] = { |
| 3358 | &rdev_state.attr, |
| 3359 | &rdev_errors.attr, |
| 3360 | &rdev_slot.attr, |
| 3361 | &rdev_offset.attr, |
| 3362 | &rdev_new_offset.attr, |
| 3363 | &rdev_size.attr, |
| 3364 | &rdev_recovery_start.attr, |
| 3365 | &rdev_bad_blocks.attr, |
| 3366 | &rdev_unack_bad_blocks.attr, |
| 3367 | &rdev_ppl_sector.attr, |
| 3368 | &rdev_ppl_size.attr, |
| 3369 | NULL, |
| 3370 | }; |
| 3371 | static ssize_t |
| 3372 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) |
| 3373 | { |
| 3374 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); |
| 3375 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
| 3376 | |
| 3377 | if (!entry->show) |
| 3378 | return -EIO; |
| 3379 | if (!rdev->mddev) |
| 3380 | return -EBUSY; |
| 3381 | return entry->show(rdev, page); |
| 3382 | } |
| 3383 | |
| 3384 | static ssize_t |
| 3385 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, |
| 3386 | const char *page, size_t length) |
| 3387 | { |
| 3388 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); |
| 3389 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
| 3390 | ssize_t rv; |
| 3391 | struct mddev *mddev = rdev->mddev; |
| 3392 | |
| 3393 | if (!entry->store) |
| 3394 | return -EIO; |
| 3395 | if (!capable(CAP_SYS_ADMIN)) |
| 3396 | return -EACCES; |
| 3397 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
| 3398 | if (!rv) { |
| 3399 | if (rdev->mddev == NULL) |
| 3400 | rv = -EBUSY; |
| 3401 | else |
| 3402 | rv = entry->store(rdev, page, length); |
| 3403 | mddev_unlock(mddev); |
| 3404 | } |
| 3405 | return rv; |
| 3406 | } |
| 3407 | |
| 3408 | static void rdev_free(struct kobject *ko) |
| 3409 | { |
| 3410 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
| 3411 | kfree(rdev); |
| 3412 | } |
| 3413 | static const struct sysfs_ops rdev_sysfs_ops = { |
| 3414 | .show = rdev_attr_show, |
| 3415 | .store = rdev_attr_store, |
| 3416 | }; |
| 3417 | static struct kobj_type rdev_ktype = { |
| 3418 | .release = rdev_free, |
| 3419 | .sysfs_ops = &rdev_sysfs_ops, |
| 3420 | .default_attrs = rdev_default_attrs, |
| 3421 | }; |
| 3422 | |
| 3423 | int md_rdev_init(struct md_rdev *rdev) |
| 3424 | { |
| 3425 | rdev->desc_nr = -1; |
| 3426 | rdev->saved_raid_disk = -1; |
| 3427 | rdev->raid_disk = -1; |
| 3428 | rdev->flags = 0; |
| 3429 | rdev->data_offset = 0; |
| 3430 | rdev->new_data_offset = 0; |
| 3431 | rdev->sb_events = 0; |
| 3432 | rdev->last_read_error = 0; |
| 3433 | rdev->sb_loaded = 0; |
| 3434 | rdev->bb_page = NULL; |
| 3435 | atomic_set(&rdev->nr_pending, 0); |
| 3436 | atomic_set(&rdev->read_errors, 0); |
| 3437 | atomic_set(&rdev->corrected_errors, 0); |
| 3438 | |
| 3439 | INIT_LIST_HEAD(&rdev->same_set); |
| 3440 | init_waitqueue_head(&rdev->blocked_wait); |
| 3441 | |
| 3442 | /* Add space to store bad block list. |
| 3443 | * This reserves the space even on arrays where it cannot |
| 3444 | * be used - I wonder if that matters |
| 3445 | */ |
| 3446 | return badblocks_init(&rdev->badblocks, 0); |
| 3447 | } |
| 3448 | EXPORT_SYMBOL_GPL(md_rdev_init); |
| 3449 | /* |
| 3450 | * Import a device. If 'super_format' >= 0, then sanity check the superblock |
| 3451 | * |
| 3452 | * mark the device faulty if: |
| 3453 | * |
| 3454 | * - the device is nonexistent (zero size) |
| 3455 | * - the device has no valid superblock |
| 3456 | * |
| 3457 | * a faulty rdev _never_ has rdev->sb set. |
| 3458 | */ |
| 3459 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
| 3460 | { |
| 3461 | char b[BDEVNAME_SIZE]; |
| 3462 | int err; |
| 3463 | struct md_rdev *rdev; |
| 3464 | sector_t size; |
| 3465 | |
| 3466 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
| 3467 | if (!rdev) |
| 3468 | return ERR_PTR(-ENOMEM); |
| 3469 | |
| 3470 | err = md_rdev_init(rdev); |
| 3471 | if (err) |
| 3472 | goto abort_free; |
| 3473 | err = alloc_disk_sb(rdev); |
| 3474 | if (err) |
| 3475 | goto abort_free; |
| 3476 | |
| 3477 | err = lock_rdev(rdev, newdev, super_format == -2); |
| 3478 | if (err) |
| 3479 | goto abort_free; |
| 3480 | |
| 3481 | kobject_init(&rdev->kobj, &rdev_ktype); |
| 3482 | |
| 3483 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
| 3484 | if (!size) { |
| 3485 | pr_warn("md: %s has zero or unknown size, marking faulty!\n", |
| 3486 | bdevname(rdev->bdev,b)); |
| 3487 | err = -EINVAL; |
| 3488 | goto abort_free; |
| 3489 | } |
| 3490 | |
| 3491 | if (super_format >= 0) { |
| 3492 | err = super_types[super_format]. |
| 3493 | load_super(rdev, NULL, super_minor); |
| 3494 | if (err == -EINVAL) { |
| 3495 | pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n", |
| 3496 | bdevname(rdev->bdev,b), |
| 3497 | super_format, super_minor); |
| 3498 | goto abort_free; |
| 3499 | } |
| 3500 | if (err < 0) { |
| 3501 | pr_warn("md: could not read %s's sb, not importing!\n", |
| 3502 | bdevname(rdev->bdev,b)); |
| 3503 | goto abort_free; |
| 3504 | } |
| 3505 | } |
| 3506 | |
| 3507 | return rdev; |
| 3508 | |
| 3509 | abort_free: |
| 3510 | if (rdev->bdev) |
| 3511 | unlock_rdev(rdev); |
| 3512 | md_rdev_clear(rdev); |
| 3513 | kfree(rdev); |
| 3514 | return ERR_PTR(err); |
| 3515 | } |
| 3516 | |
| 3517 | /* |
| 3518 | * Check a full RAID array for plausibility |
| 3519 | */ |
| 3520 | |
| 3521 | static void analyze_sbs(struct mddev *mddev) |
| 3522 | { |
| 3523 | int i; |
| 3524 | struct md_rdev *rdev, *freshest, *tmp; |
| 3525 | char b[BDEVNAME_SIZE]; |
| 3526 | |
| 3527 | freshest = NULL; |
| 3528 | rdev_for_each_safe(rdev, tmp, mddev) |
| 3529 | switch (super_types[mddev->major_version]. |
| 3530 | load_super(rdev, freshest, mddev->minor_version)) { |
| 3531 | case 1: |
| 3532 | freshest = rdev; |
| 3533 | break; |
| 3534 | case 0: |
| 3535 | break; |
| 3536 | default: |
| 3537 | pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n", |
| 3538 | bdevname(rdev->bdev,b)); |
| 3539 | md_kick_rdev_from_array(rdev); |
| 3540 | } |
| 3541 | |
| 3542 | super_types[mddev->major_version]. |
| 3543 | validate_super(mddev, freshest); |
| 3544 | |
| 3545 | i = 0; |
| 3546 | rdev_for_each_safe(rdev, tmp, mddev) { |
| 3547 | if (mddev->max_disks && |
| 3548 | (rdev->desc_nr >= mddev->max_disks || |
| 3549 | i > mddev->max_disks)) { |
| 3550 | pr_warn("md: %s: %s: only %d devices permitted\n", |
| 3551 | mdname(mddev), bdevname(rdev->bdev, b), |
| 3552 | mddev->max_disks); |
| 3553 | md_kick_rdev_from_array(rdev); |
| 3554 | continue; |
| 3555 | } |
| 3556 | if (rdev != freshest) { |
| 3557 | if (super_types[mddev->major_version]. |
| 3558 | validate_super(mddev, rdev)) { |
| 3559 | pr_warn("md: kicking non-fresh %s from array!\n", |
| 3560 | bdevname(rdev->bdev,b)); |
| 3561 | md_kick_rdev_from_array(rdev); |
| 3562 | continue; |
| 3563 | } |
| 3564 | } |
| 3565 | if (mddev->level == LEVEL_MULTIPATH) { |
| 3566 | rdev->desc_nr = i++; |
| 3567 | rdev->raid_disk = rdev->desc_nr; |
| 3568 | set_bit(In_sync, &rdev->flags); |
| 3569 | } else if (rdev->raid_disk >= |
| 3570 | (mddev->raid_disks - min(0, mddev->delta_disks)) && |
| 3571 | !test_bit(Journal, &rdev->flags)) { |
| 3572 | rdev->raid_disk = -1; |
| 3573 | clear_bit(In_sync, &rdev->flags); |
| 3574 | } |
| 3575 | } |
| 3576 | } |
| 3577 | |
| 3578 | /* Read a fixed-point number. |
| 3579 | * Numbers in sysfs attributes should be in "standard" units where |
| 3580 | * possible, so time should be in seconds. |
| 3581 | * However we internally use a a much smaller unit such as |
| 3582 | * milliseconds or jiffies. |
| 3583 | * This function takes a decimal number with a possible fractional |
| 3584 | * component, and produces an integer which is the result of |
| 3585 | * multiplying that number by 10^'scale'. |
| 3586 | * all without any floating-point arithmetic. |
| 3587 | */ |
| 3588 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) |
| 3589 | { |
| 3590 | unsigned long result = 0; |
| 3591 | long decimals = -1; |
| 3592 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { |
| 3593 | if (*cp == '.') |
| 3594 | decimals = 0; |
| 3595 | else if (decimals < scale) { |
| 3596 | unsigned int value; |
| 3597 | value = *cp - '0'; |
| 3598 | result = result * 10 + value; |
| 3599 | if (decimals >= 0) |
| 3600 | decimals++; |
| 3601 | } |
| 3602 | cp++; |
| 3603 | } |
| 3604 | if (*cp == '\n') |
| 3605 | cp++; |
| 3606 | if (*cp) |
| 3607 | return -EINVAL; |
| 3608 | if (decimals < 0) |
| 3609 | decimals = 0; |
| 3610 | while (decimals < scale) { |
| 3611 | result *= 10; |
| 3612 | decimals ++; |
| 3613 | } |
| 3614 | *res = result; |
| 3615 | return 0; |
| 3616 | } |
| 3617 | |
| 3618 | static ssize_t |
| 3619 | safe_delay_show(struct mddev *mddev, char *page) |
| 3620 | { |
| 3621 | int msec = (mddev->safemode_delay*1000)/HZ; |
| 3622 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); |
| 3623 | } |
| 3624 | static ssize_t |
| 3625 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
| 3626 | { |
| 3627 | unsigned long msec; |
| 3628 | |
| 3629 | if (mddev_is_clustered(mddev)) { |
| 3630 | pr_warn("md: Safemode is disabled for clustered mode\n"); |
| 3631 | return -EINVAL; |
| 3632 | } |
| 3633 | |
| 3634 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
| 3635 | return -EINVAL; |
| 3636 | if (msec == 0) |
| 3637 | mddev->safemode_delay = 0; |
| 3638 | else { |
| 3639 | unsigned long old_delay = mddev->safemode_delay; |
| 3640 | unsigned long new_delay = (msec*HZ)/1000; |
| 3641 | |
| 3642 | if (new_delay == 0) |
| 3643 | new_delay = 1; |
| 3644 | mddev->safemode_delay = new_delay; |
| 3645 | if (new_delay < old_delay || old_delay == 0) |
| 3646 | mod_timer(&mddev->safemode_timer, jiffies+1); |
| 3647 | } |
| 3648 | return len; |
| 3649 | } |
| 3650 | static struct md_sysfs_entry md_safe_delay = |
| 3651 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
| 3652 | |
| 3653 | static ssize_t |
| 3654 | level_show(struct mddev *mddev, char *page) |
| 3655 | { |
| 3656 | struct md_personality *p; |
| 3657 | int ret; |
| 3658 | spin_lock(&mddev->lock); |
| 3659 | p = mddev->pers; |
| 3660 | if (p) |
| 3661 | ret = sprintf(page, "%s\n", p->name); |
| 3662 | else if (mddev->clevel[0]) |
| 3663 | ret = sprintf(page, "%s\n", mddev->clevel); |
| 3664 | else if (mddev->level != LEVEL_NONE) |
| 3665 | ret = sprintf(page, "%d\n", mddev->level); |
| 3666 | else |
| 3667 | ret = 0; |
| 3668 | spin_unlock(&mddev->lock); |
| 3669 | return ret; |
| 3670 | } |
| 3671 | |
| 3672 | static ssize_t |
| 3673 | level_store(struct mddev *mddev, const char *buf, size_t len) |
| 3674 | { |
| 3675 | char clevel[16]; |
| 3676 | ssize_t rv; |
| 3677 | size_t slen = len; |
| 3678 | struct md_personality *pers, *oldpers; |
| 3679 | long level; |
| 3680 | void *priv, *oldpriv; |
| 3681 | struct md_rdev *rdev; |
| 3682 | |
| 3683 | if (slen == 0 || slen >= sizeof(clevel)) |
| 3684 | return -EINVAL; |
| 3685 | |
| 3686 | rv = mddev_lock(mddev); |
| 3687 | if (rv) |
| 3688 | return rv; |
| 3689 | |
| 3690 | if (mddev->pers == NULL) { |
| 3691 | strncpy(mddev->clevel, buf, slen); |
| 3692 | if (mddev->clevel[slen-1] == '\n') |
| 3693 | slen--; |
| 3694 | mddev->clevel[slen] = 0; |
| 3695 | mddev->level = LEVEL_NONE; |
| 3696 | rv = len; |
| 3697 | goto out_unlock; |
| 3698 | } |
| 3699 | rv = -EROFS; |
| 3700 | if (mddev->ro) |
| 3701 | goto out_unlock; |
| 3702 | |
| 3703 | /* request to change the personality. Need to ensure: |
| 3704 | * - array is not engaged in resync/recovery/reshape |
| 3705 | * - old personality can be suspended |
| 3706 | * - new personality will access other array. |
| 3707 | */ |
| 3708 | |
| 3709 | rv = -EBUSY; |
| 3710 | if (mddev->sync_thread || |
| 3711 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| 3712 | mddev->reshape_position != MaxSector || |
| 3713 | mddev->sysfs_active) |
| 3714 | goto out_unlock; |
| 3715 | |
| 3716 | rv = -EINVAL; |
| 3717 | if (!mddev->pers->quiesce) { |
| 3718 | pr_warn("md: %s: %s does not support online personality change\n", |
| 3719 | mdname(mddev), mddev->pers->name); |
| 3720 | goto out_unlock; |
| 3721 | } |
| 3722 | |
| 3723 | /* Now find the new personality */ |
| 3724 | strncpy(clevel, buf, slen); |
| 3725 | if (clevel[slen-1] == '\n') |
| 3726 | slen--; |
| 3727 | clevel[slen] = 0; |
| 3728 | if (kstrtol(clevel, 10, &level)) |
| 3729 | level = LEVEL_NONE; |
| 3730 | |
| 3731 | if (request_module("md-%s", clevel) != 0) |
| 3732 | request_module("md-level-%s", clevel); |
| 3733 | spin_lock(&pers_lock); |
| 3734 | pers = find_pers(level, clevel); |
| 3735 | if (!pers || !try_module_get(pers->owner)) { |
| 3736 | spin_unlock(&pers_lock); |
| 3737 | pr_warn("md: personality %s not loaded\n", clevel); |
| 3738 | rv = -EINVAL; |
| 3739 | goto out_unlock; |
| 3740 | } |
| 3741 | spin_unlock(&pers_lock); |
| 3742 | |
| 3743 | if (pers == mddev->pers) { |
| 3744 | /* Nothing to do! */ |
| 3745 | module_put(pers->owner); |
| 3746 | rv = len; |
| 3747 | goto out_unlock; |
| 3748 | } |
| 3749 | if (!pers->takeover) { |
| 3750 | module_put(pers->owner); |
| 3751 | pr_warn("md: %s: %s does not support personality takeover\n", |
| 3752 | mdname(mddev), clevel); |
| 3753 | rv = -EINVAL; |
| 3754 | goto out_unlock; |
| 3755 | } |
| 3756 | |
| 3757 | rdev_for_each(rdev, mddev) |
| 3758 | rdev->new_raid_disk = rdev->raid_disk; |
| 3759 | |
| 3760 | /* ->takeover must set new_* and/or delta_disks |
| 3761 | * if it succeeds, and may set them when it fails. |
| 3762 | */ |
| 3763 | priv = pers->takeover(mddev); |
| 3764 | if (IS_ERR(priv)) { |
| 3765 | mddev->new_level = mddev->level; |
| 3766 | mddev->new_layout = mddev->layout; |
| 3767 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 3768 | mddev->raid_disks -= mddev->delta_disks; |
| 3769 | mddev->delta_disks = 0; |
| 3770 | mddev->reshape_backwards = 0; |
| 3771 | module_put(pers->owner); |
| 3772 | pr_warn("md: %s: %s would not accept array\n", |
| 3773 | mdname(mddev), clevel); |
| 3774 | rv = PTR_ERR(priv); |
| 3775 | goto out_unlock; |
| 3776 | } |
| 3777 | |
| 3778 | /* Looks like we have a winner */ |
| 3779 | mddev_suspend(mddev); |
| 3780 | mddev_detach(mddev); |
| 3781 | |
| 3782 | spin_lock(&mddev->lock); |
| 3783 | oldpers = mddev->pers; |
| 3784 | oldpriv = mddev->private; |
| 3785 | mddev->pers = pers; |
| 3786 | mddev->private = priv; |
| 3787 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
| 3788 | mddev->level = mddev->new_level; |
| 3789 | mddev->layout = mddev->new_layout; |
| 3790 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
| 3791 | mddev->delta_disks = 0; |
| 3792 | mddev->reshape_backwards = 0; |
| 3793 | mddev->degraded = 0; |
| 3794 | spin_unlock(&mddev->lock); |
| 3795 | |
| 3796 | if (oldpers->sync_request == NULL && |
| 3797 | mddev->external) { |
| 3798 | /* We are converting from a no-redundancy array |
| 3799 | * to a redundancy array and metadata is managed |
| 3800 | * externally so we need to be sure that writes |
| 3801 | * won't block due to a need to transition |
| 3802 | * clean->dirty |
| 3803 | * until external management is started. |
| 3804 | */ |
| 3805 | mddev->in_sync = 0; |
| 3806 | mddev->safemode_delay = 0; |
| 3807 | mddev->safemode = 0; |
| 3808 | } |
| 3809 | |
| 3810 | oldpers->free(mddev, oldpriv); |
| 3811 | |
| 3812 | if (oldpers->sync_request == NULL && |
| 3813 | pers->sync_request != NULL) { |
| 3814 | /* need to add the md_redundancy_group */ |
| 3815 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) |
| 3816 | pr_warn("md: cannot register extra attributes for %s\n", |
| 3817 | mdname(mddev)); |
| 3818 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
| 3819 | } |
| 3820 | if (oldpers->sync_request != NULL && |
| 3821 | pers->sync_request == NULL) { |
| 3822 | /* need to remove the md_redundancy_group */ |
| 3823 | if (mddev->to_remove == NULL) |
| 3824 | mddev->to_remove = &md_redundancy_group; |
| 3825 | } |
| 3826 | |
| 3827 | module_put(oldpers->owner); |
| 3828 | |
| 3829 | rdev_for_each(rdev, mddev) { |
| 3830 | if (rdev->raid_disk < 0) |
| 3831 | continue; |
| 3832 | if (rdev->new_raid_disk >= mddev->raid_disks) |
| 3833 | rdev->new_raid_disk = -1; |
| 3834 | if (rdev->new_raid_disk == rdev->raid_disk) |
| 3835 | continue; |
| 3836 | sysfs_unlink_rdev(mddev, rdev); |
| 3837 | } |
| 3838 | rdev_for_each(rdev, mddev) { |
| 3839 | if (rdev->raid_disk < 0) |
| 3840 | continue; |
| 3841 | if (rdev->new_raid_disk == rdev->raid_disk) |
| 3842 | continue; |
| 3843 | rdev->raid_disk = rdev->new_raid_disk; |
| 3844 | if (rdev->raid_disk < 0) |
| 3845 | clear_bit(In_sync, &rdev->flags); |
| 3846 | else { |
| 3847 | if (sysfs_link_rdev(mddev, rdev)) |
| 3848 | pr_warn("md: cannot register rd%d for %s after level change\n", |
| 3849 | rdev->raid_disk, mdname(mddev)); |
| 3850 | } |
| 3851 | } |
| 3852 | |
| 3853 | if (pers->sync_request == NULL) { |
| 3854 | /* this is now an array without redundancy, so |
| 3855 | * it must always be in_sync |
| 3856 | */ |
| 3857 | mddev->in_sync = 1; |
| 3858 | del_timer_sync(&mddev->safemode_timer); |
| 3859 | } |
| 3860 | blk_set_stacking_limits(&mddev->queue->limits); |
| 3861 | pers->run(mddev); |
| 3862 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 3863 | mddev_resume(mddev); |
| 3864 | if (!mddev->thread) |
| 3865 | md_update_sb(mddev, 1); |
| 3866 | sysfs_notify(&mddev->kobj, NULL, "level"); |
| 3867 | md_new_event(mddev); |
| 3868 | rv = len; |
| 3869 | out_unlock: |
| 3870 | mddev_unlock(mddev); |
| 3871 | return rv; |
| 3872 | } |
| 3873 | |
| 3874 | static struct md_sysfs_entry md_level = |
| 3875 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
| 3876 | |
| 3877 | static ssize_t |
| 3878 | layout_show(struct mddev *mddev, char *page) |
| 3879 | { |
| 3880 | /* just a number, not meaningful for all levels */ |
| 3881 | if (mddev->reshape_position != MaxSector && |
| 3882 | mddev->layout != mddev->new_layout) |
| 3883 | return sprintf(page, "%d (%d)\n", |
| 3884 | mddev->new_layout, mddev->layout); |
| 3885 | return sprintf(page, "%d\n", mddev->layout); |
| 3886 | } |
| 3887 | |
| 3888 | static ssize_t |
| 3889 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
| 3890 | { |
| 3891 | unsigned int n; |
| 3892 | int err; |
| 3893 | |
| 3894 | err = kstrtouint(buf, 10, &n); |
| 3895 | if (err < 0) |
| 3896 | return err; |
| 3897 | err = mddev_lock(mddev); |
| 3898 | if (err) |
| 3899 | return err; |
| 3900 | |
| 3901 | if (mddev->pers) { |
| 3902 | if (mddev->pers->check_reshape == NULL) |
| 3903 | err = -EBUSY; |
| 3904 | else if (mddev->ro) |
| 3905 | err = -EROFS; |
| 3906 | else { |
| 3907 | mddev->new_layout = n; |
| 3908 | err = mddev->pers->check_reshape(mddev); |
| 3909 | if (err) |
| 3910 | mddev->new_layout = mddev->layout; |
| 3911 | } |
| 3912 | } else { |
| 3913 | mddev->new_layout = n; |
| 3914 | if (mddev->reshape_position == MaxSector) |
| 3915 | mddev->layout = n; |
| 3916 | } |
| 3917 | mddev_unlock(mddev); |
| 3918 | return err ?: len; |
| 3919 | } |
| 3920 | static struct md_sysfs_entry md_layout = |
| 3921 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
| 3922 | |
| 3923 | static ssize_t |
| 3924 | raid_disks_show(struct mddev *mddev, char *page) |
| 3925 | { |
| 3926 | if (mddev->raid_disks == 0) |
| 3927 | return 0; |
| 3928 | if (mddev->reshape_position != MaxSector && |
| 3929 | mddev->delta_disks != 0) |
| 3930 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, |
| 3931 | mddev->raid_disks - mddev->delta_disks); |
| 3932 | return sprintf(page, "%d\n", mddev->raid_disks); |
| 3933 | } |
| 3934 | |
| 3935 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
| 3936 | |
| 3937 | static ssize_t |
| 3938 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
| 3939 | { |
| 3940 | unsigned int n; |
| 3941 | int err; |
| 3942 | |
| 3943 | err = kstrtouint(buf, 10, &n); |
| 3944 | if (err < 0) |
| 3945 | return err; |
| 3946 | |
| 3947 | err = mddev_lock(mddev); |
| 3948 | if (err) |
| 3949 | return err; |
| 3950 | if (mddev->pers) |
| 3951 | err = update_raid_disks(mddev, n); |
| 3952 | else if (mddev->reshape_position != MaxSector) { |
| 3953 | struct md_rdev *rdev; |
| 3954 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
| 3955 | |
| 3956 | err = -EINVAL; |
| 3957 | rdev_for_each(rdev, mddev) { |
| 3958 | if (olddisks < n && |
| 3959 | rdev->data_offset < rdev->new_data_offset) |
| 3960 | goto out_unlock; |
| 3961 | if (olddisks > n && |
| 3962 | rdev->data_offset > rdev->new_data_offset) |
| 3963 | goto out_unlock; |
| 3964 | } |
| 3965 | err = 0; |
| 3966 | mddev->delta_disks = n - olddisks; |
| 3967 | mddev->raid_disks = n; |
| 3968 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
| 3969 | } else |
| 3970 | mddev->raid_disks = n; |
| 3971 | out_unlock: |
| 3972 | mddev_unlock(mddev); |
| 3973 | return err ? err : len; |
| 3974 | } |
| 3975 | static struct md_sysfs_entry md_raid_disks = |
| 3976 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
| 3977 | |
| 3978 | static ssize_t |
| 3979 | chunk_size_show(struct mddev *mddev, char *page) |
| 3980 | { |
| 3981 | if (mddev->reshape_position != MaxSector && |
| 3982 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
| 3983 | return sprintf(page, "%d (%d)\n", |
| 3984 | mddev->new_chunk_sectors << 9, |
| 3985 | mddev->chunk_sectors << 9); |
| 3986 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); |
| 3987 | } |
| 3988 | |
| 3989 | static ssize_t |
| 3990 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
| 3991 | { |
| 3992 | unsigned long n; |
| 3993 | int err; |
| 3994 | |
| 3995 | err = kstrtoul(buf, 10, &n); |
| 3996 | if (err < 0) |
| 3997 | return err; |
| 3998 | |
| 3999 | err = mddev_lock(mddev); |
| 4000 | if (err) |
| 4001 | return err; |
| 4002 | if (mddev->pers) { |
| 4003 | if (mddev->pers->check_reshape == NULL) |
| 4004 | err = -EBUSY; |
| 4005 | else if (mddev->ro) |
| 4006 | err = -EROFS; |
| 4007 | else { |
| 4008 | mddev->new_chunk_sectors = n >> 9; |
| 4009 | err = mddev->pers->check_reshape(mddev); |
| 4010 | if (err) |
| 4011 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 4012 | } |
| 4013 | } else { |
| 4014 | mddev->new_chunk_sectors = n >> 9; |
| 4015 | if (mddev->reshape_position == MaxSector) |
| 4016 | mddev->chunk_sectors = n >> 9; |
| 4017 | } |
| 4018 | mddev_unlock(mddev); |
| 4019 | return err ?: len; |
| 4020 | } |
| 4021 | static struct md_sysfs_entry md_chunk_size = |
| 4022 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
| 4023 | |
| 4024 | static ssize_t |
| 4025 | resync_start_show(struct mddev *mddev, char *page) |
| 4026 | { |
| 4027 | if (mddev->recovery_cp == MaxSector) |
| 4028 | return sprintf(page, "none\n"); |
| 4029 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
| 4030 | } |
| 4031 | |
| 4032 | static ssize_t |
| 4033 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
| 4034 | { |
| 4035 | unsigned long long n; |
| 4036 | int err; |
| 4037 | |
| 4038 | if (cmd_match(buf, "none")) |
| 4039 | n = MaxSector; |
| 4040 | else { |
| 4041 | err = kstrtoull(buf, 10, &n); |
| 4042 | if (err < 0) |
| 4043 | return err; |
| 4044 | if (n != (sector_t)n) |
| 4045 | return -EINVAL; |
| 4046 | } |
| 4047 | |
| 4048 | err = mddev_lock(mddev); |
| 4049 | if (err) |
| 4050 | return err; |
| 4051 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
| 4052 | err = -EBUSY; |
| 4053 | |
| 4054 | if (!err) { |
| 4055 | mddev->recovery_cp = n; |
| 4056 | if (mddev->pers) |
| 4057 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
| 4058 | } |
| 4059 | mddev_unlock(mddev); |
| 4060 | return err ?: len; |
| 4061 | } |
| 4062 | static struct md_sysfs_entry md_resync_start = |
| 4063 | __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, |
| 4064 | resync_start_show, resync_start_store); |
| 4065 | |
| 4066 | /* |
| 4067 | * The array state can be: |
| 4068 | * |
| 4069 | * clear |
| 4070 | * No devices, no size, no level |
| 4071 | * Equivalent to STOP_ARRAY ioctl |
| 4072 | * inactive |
| 4073 | * May have some settings, but array is not active |
| 4074 | * all IO results in error |
| 4075 | * When written, doesn't tear down array, but just stops it |
| 4076 | * suspended (not supported yet) |
| 4077 | * All IO requests will block. The array can be reconfigured. |
| 4078 | * Writing this, if accepted, will block until array is quiescent |
| 4079 | * readonly |
| 4080 | * no resync can happen. no superblocks get written. |
| 4081 | * write requests fail |
| 4082 | * read-auto |
| 4083 | * like readonly, but behaves like 'clean' on a write request. |
| 4084 | * |
| 4085 | * clean - no pending writes, but otherwise active. |
| 4086 | * When written to inactive array, starts without resync |
| 4087 | * If a write request arrives then |
| 4088 | * if metadata is known, mark 'dirty' and switch to 'active'. |
| 4089 | * if not known, block and switch to write-pending |
| 4090 | * If written to an active array that has pending writes, then fails. |
| 4091 | * active |
| 4092 | * fully active: IO and resync can be happening. |
| 4093 | * When written to inactive array, starts with resync |
| 4094 | * |
| 4095 | * write-pending |
| 4096 | * clean, but writes are blocked waiting for 'active' to be written. |
| 4097 | * |
| 4098 | * active-idle |
| 4099 | * like active, but no writes have been seen for a while (100msec). |
| 4100 | * |
| 4101 | */ |
| 4102 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, |
| 4103 | write_pending, active_idle, bad_word}; |
| 4104 | static char *array_states[] = { |
| 4105 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
| 4106 | "write-pending", "active-idle", NULL }; |
| 4107 | |
| 4108 | static int match_word(const char *word, char **list) |
| 4109 | { |
| 4110 | int n; |
| 4111 | for (n=0; list[n]; n++) |
| 4112 | if (cmd_match(word, list[n])) |
| 4113 | break; |
| 4114 | return n; |
| 4115 | } |
| 4116 | |
| 4117 | static ssize_t |
| 4118 | array_state_show(struct mddev *mddev, char *page) |
| 4119 | { |
| 4120 | enum array_state st = inactive; |
| 4121 | |
| 4122 | if (mddev->pers) |
| 4123 | switch(mddev->ro) { |
| 4124 | case 1: |
| 4125 | st = readonly; |
| 4126 | break; |
| 4127 | case 2: |
| 4128 | st = read_auto; |
| 4129 | break; |
| 4130 | case 0: |
| 4131 | spin_lock(&mddev->lock); |
| 4132 | if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
| 4133 | st = write_pending; |
| 4134 | else if (mddev->in_sync) |
| 4135 | st = clean; |
| 4136 | else if (mddev->safemode) |
| 4137 | st = active_idle; |
| 4138 | else |
| 4139 | st = active; |
| 4140 | spin_unlock(&mddev->lock); |
| 4141 | } |
| 4142 | else { |
| 4143 | if (list_empty(&mddev->disks) && |
| 4144 | mddev->raid_disks == 0 && |
| 4145 | mddev->dev_sectors == 0) |
| 4146 | st = clear; |
| 4147 | else |
| 4148 | st = inactive; |
| 4149 | } |
| 4150 | return sprintf(page, "%s\n", array_states[st]); |
| 4151 | } |
| 4152 | |
| 4153 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
| 4154 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); |
| 4155 | static int do_md_run(struct mddev *mddev); |
| 4156 | static int restart_array(struct mddev *mddev); |
| 4157 | |
| 4158 | static ssize_t |
| 4159 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
| 4160 | { |
| 4161 | int err = 0; |
| 4162 | enum array_state st = match_word(buf, array_states); |
| 4163 | |
| 4164 | if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { |
| 4165 | /* don't take reconfig_mutex when toggling between |
| 4166 | * clean and active |
| 4167 | */ |
| 4168 | spin_lock(&mddev->lock); |
| 4169 | if (st == active) { |
| 4170 | restart_array(mddev); |
| 4171 | clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
| 4172 | md_wakeup_thread(mddev->thread); |
| 4173 | wake_up(&mddev->sb_wait); |
| 4174 | } else /* st == clean */ { |
| 4175 | restart_array(mddev); |
| 4176 | if (!set_in_sync(mddev)) |
| 4177 | err = -EBUSY; |
| 4178 | } |
| 4179 | if (!err) |
| 4180 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 4181 | spin_unlock(&mddev->lock); |
| 4182 | return err ?: len; |
| 4183 | } |
| 4184 | err = mddev_lock(mddev); |
| 4185 | if (err) |
| 4186 | return err; |
| 4187 | err = -EINVAL; |
| 4188 | switch(st) { |
| 4189 | case bad_word: |
| 4190 | break; |
| 4191 | case clear: |
| 4192 | /* stopping an active array */ |
| 4193 | err = do_md_stop(mddev, 0, NULL); |
| 4194 | break; |
| 4195 | case inactive: |
| 4196 | /* stopping an active array */ |
| 4197 | if (mddev->pers) |
| 4198 | err = do_md_stop(mddev, 2, NULL); |
| 4199 | else |
| 4200 | err = 0; /* already inactive */ |
| 4201 | break; |
| 4202 | case suspended: |
| 4203 | break; /* not supported yet */ |
| 4204 | case readonly: |
| 4205 | if (mddev->pers) |
| 4206 | err = md_set_readonly(mddev, NULL); |
| 4207 | else { |
| 4208 | mddev->ro = 1; |
| 4209 | set_disk_ro(mddev->gendisk, 1); |
| 4210 | err = do_md_run(mddev); |
| 4211 | } |
| 4212 | break; |
| 4213 | case read_auto: |
| 4214 | if (mddev->pers) { |
| 4215 | if (mddev->ro == 0) |
| 4216 | err = md_set_readonly(mddev, NULL); |
| 4217 | else if (mddev->ro == 1) |
| 4218 | err = restart_array(mddev); |
| 4219 | if (err == 0) { |
| 4220 | mddev->ro = 2; |
| 4221 | set_disk_ro(mddev->gendisk, 0); |
| 4222 | } |
| 4223 | } else { |
| 4224 | mddev->ro = 2; |
| 4225 | err = do_md_run(mddev); |
| 4226 | } |
| 4227 | break; |
| 4228 | case clean: |
| 4229 | if (mddev->pers) { |
| 4230 | err = restart_array(mddev); |
| 4231 | if (err) |
| 4232 | break; |
| 4233 | spin_lock(&mddev->lock); |
| 4234 | if (!set_in_sync(mddev)) |
| 4235 | err = -EBUSY; |
| 4236 | spin_unlock(&mddev->lock); |
| 4237 | } else |
| 4238 | err = -EINVAL; |
| 4239 | break; |
| 4240 | case active: |
| 4241 | if (mddev->pers) { |
| 4242 | err = restart_array(mddev); |
| 4243 | if (err) |
| 4244 | break; |
| 4245 | clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
| 4246 | wake_up(&mddev->sb_wait); |
| 4247 | err = 0; |
| 4248 | } else { |
| 4249 | mddev->ro = 0; |
| 4250 | set_disk_ro(mddev->gendisk, 0); |
| 4251 | err = do_md_run(mddev); |
| 4252 | } |
| 4253 | break; |
| 4254 | case write_pending: |
| 4255 | case active_idle: |
| 4256 | /* these cannot be set */ |
| 4257 | break; |
| 4258 | } |
| 4259 | |
| 4260 | if (!err) { |
| 4261 | if (mddev->hold_active == UNTIL_IOCTL) |
| 4262 | mddev->hold_active = 0; |
| 4263 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 4264 | } |
| 4265 | mddev_unlock(mddev); |
| 4266 | return err ?: len; |
| 4267 | } |
| 4268 | static struct md_sysfs_entry md_array_state = |
| 4269 | __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
| 4270 | |
| 4271 | static ssize_t |
| 4272 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
| 4273 | return sprintf(page, "%d\n", |
| 4274 | atomic_read(&mddev->max_corr_read_errors)); |
| 4275 | } |
| 4276 | |
| 4277 | static ssize_t |
| 4278 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
| 4279 | { |
| 4280 | unsigned int n; |
| 4281 | int rv; |
| 4282 | |
| 4283 | rv = kstrtouint(buf, 10, &n); |
| 4284 | if (rv < 0) |
| 4285 | return rv; |
| 4286 | atomic_set(&mddev->max_corr_read_errors, n); |
| 4287 | return len; |
| 4288 | } |
| 4289 | |
| 4290 | static struct md_sysfs_entry max_corr_read_errors = |
| 4291 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, |
| 4292 | max_corrected_read_errors_store); |
| 4293 | |
| 4294 | static ssize_t |
| 4295 | null_show(struct mddev *mddev, char *page) |
| 4296 | { |
| 4297 | return -EINVAL; |
| 4298 | } |
| 4299 | |
| 4300 | static ssize_t |
| 4301 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
| 4302 | { |
| 4303 | /* buf must be %d:%d\n? giving major and minor numbers */ |
| 4304 | /* The new device is added to the array. |
| 4305 | * If the array has a persistent superblock, we read the |
| 4306 | * superblock to initialise info and check validity. |
| 4307 | * Otherwise, only checking done is that in bind_rdev_to_array, |
| 4308 | * which mainly checks size. |
| 4309 | */ |
| 4310 | char *e; |
| 4311 | int major = simple_strtoul(buf, &e, 10); |
| 4312 | int minor; |
| 4313 | dev_t dev; |
| 4314 | struct md_rdev *rdev; |
| 4315 | int err; |
| 4316 | |
| 4317 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') |
| 4318 | return -EINVAL; |
| 4319 | minor = simple_strtoul(e+1, &e, 10); |
| 4320 | if (*e && *e != '\n') |
| 4321 | return -EINVAL; |
| 4322 | dev = MKDEV(major, minor); |
| 4323 | if (major != MAJOR(dev) || |
| 4324 | minor != MINOR(dev)) |
| 4325 | return -EOVERFLOW; |
| 4326 | |
| 4327 | flush_workqueue(md_misc_wq); |
| 4328 | |
| 4329 | err = mddev_lock(mddev); |
| 4330 | if (err) |
| 4331 | return err; |
| 4332 | if (mddev->persistent) { |
| 4333 | rdev = md_import_device(dev, mddev->major_version, |
| 4334 | mddev->minor_version); |
| 4335 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { |
| 4336 | struct md_rdev *rdev0 |
| 4337 | = list_entry(mddev->disks.next, |
| 4338 | struct md_rdev, same_set); |
| 4339 | err = super_types[mddev->major_version] |
| 4340 | .load_super(rdev, rdev0, mddev->minor_version); |
| 4341 | if (err < 0) |
| 4342 | goto out; |
| 4343 | } |
| 4344 | } else if (mddev->external) |
| 4345 | rdev = md_import_device(dev, -2, -1); |
| 4346 | else |
| 4347 | rdev = md_import_device(dev, -1, -1); |
| 4348 | |
| 4349 | if (IS_ERR(rdev)) { |
| 4350 | mddev_unlock(mddev); |
| 4351 | return PTR_ERR(rdev); |
| 4352 | } |
| 4353 | err = bind_rdev_to_array(rdev, mddev); |
| 4354 | out: |
| 4355 | if (err) |
| 4356 | export_rdev(rdev); |
| 4357 | mddev_unlock(mddev); |
| 4358 | if (!err) |
| 4359 | md_new_event(mddev); |
| 4360 | return err ? err : len; |
| 4361 | } |
| 4362 | |
| 4363 | static struct md_sysfs_entry md_new_device = |
| 4364 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
| 4365 | |
| 4366 | static ssize_t |
| 4367 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
| 4368 | { |
| 4369 | char *end; |
| 4370 | unsigned long chunk, end_chunk; |
| 4371 | int err; |
| 4372 | |
| 4373 | err = mddev_lock(mddev); |
| 4374 | if (err) |
| 4375 | return err; |
| 4376 | if (!mddev->bitmap) |
| 4377 | goto out; |
| 4378 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ |
| 4379 | while (*buf) { |
| 4380 | chunk = end_chunk = simple_strtoul(buf, &end, 0); |
| 4381 | if (buf == end) break; |
| 4382 | if (*end == '-') { /* range */ |
| 4383 | buf = end + 1; |
| 4384 | end_chunk = simple_strtoul(buf, &end, 0); |
| 4385 | if (buf == end) break; |
| 4386 | } |
| 4387 | if (*end && !isspace(*end)) break; |
| 4388 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); |
| 4389 | buf = skip_spaces(end); |
| 4390 | } |
| 4391 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ |
| 4392 | out: |
| 4393 | mddev_unlock(mddev); |
| 4394 | return len; |
| 4395 | } |
| 4396 | |
| 4397 | static struct md_sysfs_entry md_bitmap = |
| 4398 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); |
| 4399 | |
| 4400 | static ssize_t |
| 4401 | size_show(struct mddev *mddev, char *page) |
| 4402 | { |
| 4403 | return sprintf(page, "%llu\n", |
| 4404 | (unsigned long long)mddev->dev_sectors / 2); |
| 4405 | } |
| 4406 | |
| 4407 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
| 4408 | |
| 4409 | static ssize_t |
| 4410 | size_store(struct mddev *mddev, const char *buf, size_t len) |
| 4411 | { |
| 4412 | /* If array is inactive, we can reduce the component size, but |
| 4413 | * not increase it (except from 0). |
| 4414 | * If array is active, we can try an on-line resize |
| 4415 | */ |
| 4416 | sector_t sectors; |
| 4417 | int err = strict_blocks_to_sectors(buf, §ors); |
| 4418 | |
| 4419 | if (err < 0) |
| 4420 | return err; |
| 4421 | err = mddev_lock(mddev); |
| 4422 | if (err) |
| 4423 | return err; |
| 4424 | if (mddev->pers) { |
| 4425 | err = update_size(mddev, sectors); |
| 4426 | if (err == 0) |
| 4427 | md_update_sb(mddev, 1); |
| 4428 | } else { |
| 4429 | if (mddev->dev_sectors == 0 || |
| 4430 | mddev->dev_sectors > sectors) |
| 4431 | mddev->dev_sectors = sectors; |
| 4432 | else |
| 4433 | err = -ENOSPC; |
| 4434 | } |
| 4435 | mddev_unlock(mddev); |
| 4436 | return err ? err : len; |
| 4437 | } |
| 4438 | |
| 4439 | static struct md_sysfs_entry md_size = |
| 4440 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
| 4441 | |
| 4442 | /* Metadata version. |
| 4443 | * This is one of |
| 4444 | * 'none' for arrays with no metadata (good luck...) |
| 4445 | * 'external' for arrays with externally managed metadata, |
| 4446 | * or N.M for internally known formats |
| 4447 | */ |
| 4448 | static ssize_t |
| 4449 | metadata_show(struct mddev *mddev, char *page) |
| 4450 | { |
| 4451 | if (mddev->persistent) |
| 4452 | return sprintf(page, "%d.%d\n", |
| 4453 | mddev->major_version, mddev->minor_version); |
| 4454 | else if (mddev->external) |
| 4455 | return sprintf(page, "external:%s\n", mddev->metadata_type); |
| 4456 | else |
| 4457 | return sprintf(page, "none\n"); |
| 4458 | } |
| 4459 | |
| 4460 | static ssize_t |
| 4461 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
| 4462 | { |
| 4463 | int major, minor; |
| 4464 | char *e; |
| 4465 | int err; |
| 4466 | /* Changing the details of 'external' metadata is |
| 4467 | * always permitted. Otherwise there must be |
| 4468 | * no devices attached to the array. |
| 4469 | */ |
| 4470 | |
| 4471 | err = mddev_lock(mddev); |
| 4472 | if (err) |
| 4473 | return err; |
| 4474 | err = -EBUSY; |
| 4475 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
| 4476 | ; |
| 4477 | else if (!list_empty(&mddev->disks)) |
| 4478 | goto out_unlock; |
| 4479 | |
| 4480 | err = 0; |
| 4481 | if (cmd_match(buf, "none")) { |
| 4482 | mddev->persistent = 0; |
| 4483 | mddev->external = 0; |
| 4484 | mddev->major_version = 0; |
| 4485 | mddev->minor_version = 90; |
| 4486 | goto out_unlock; |
| 4487 | } |
| 4488 | if (strncmp(buf, "external:", 9) == 0) { |
| 4489 | size_t namelen = len-9; |
| 4490 | if (namelen >= sizeof(mddev->metadata_type)) |
| 4491 | namelen = sizeof(mddev->metadata_type)-1; |
| 4492 | strncpy(mddev->metadata_type, buf+9, namelen); |
| 4493 | mddev->metadata_type[namelen] = 0; |
| 4494 | if (namelen && mddev->metadata_type[namelen-1] == '\n') |
| 4495 | mddev->metadata_type[--namelen] = 0; |
| 4496 | mddev->persistent = 0; |
| 4497 | mddev->external = 1; |
| 4498 | mddev->major_version = 0; |
| 4499 | mddev->minor_version = 90; |
| 4500 | goto out_unlock; |
| 4501 | } |
| 4502 | major = simple_strtoul(buf, &e, 10); |
| 4503 | err = -EINVAL; |
| 4504 | if (e==buf || *e != '.') |
| 4505 | goto out_unlock; |
| 4506 | buf = e+1; |
| 4507 | minor = simple_strtoul(buf, &e, 10); |
| 4508 | if (e==buf || (*e && *e != '\n') ) |
| 4509 | goto out_unlock; |
| 4510 | err = -ENOENT; |
| 4511 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
| 4512 | goto out_unlock; |
| 4513 | mddev->major_version = major; |
| 4514 | mddev->minor_version = minor; |
| 4515 | mddev->persistent = 1; |
| 4516 | mddev->external = 0; |
| 4517 | err = 0; |
| 4518 | out_unlock: |
| 4519 | mddev_unlock(mddev); |
| 4520 | return err ?: len; |
| 4521 | } |
| 4522 | |
| 4523 | static struct md_sysfs_entry md_metadata = |
| 4524 | __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
| 4525 | |
| 4526 | static ssize_t |
| 4527 | action_show(struct mddev *mddev, char *page) |
| 4528 | { |
| 4529 | char *type = "idle"; |
| 4530 | unsigned long recovery = mddev->recovery; |
| 4531 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) |
| 4532 | type = "frozen"; |
| 4533 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
| 4534 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { |
| 4535 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) |
| 4536 | type = "reshape"; |
| 4537 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
| 4538 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) |
| 4539 | type = "resync"; |
| 4540 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
| 4541 | type = "check"; |
| 4542 | else |
| 4543 | type = "repair"; |
| 4544 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
| 4545 | type = "recover"; |
| 4546 | else if (mddev->reshape_position != MaxSector) |
| 4547 | type = "reshape"; |
| 4548 | } |
| 4549 | return sprintf(page, "%s\n", type); |
| 4550 | } |
| 4551 | |
| 4552 | static ssize_t |
| 4553 | action_store(struct mddev *mddev, const char *page, size_t len) |
| 4554 | { |
| 4555 | if (!mddev->pers || !mddev->pers->sync_request) |
| 4556 | return -EINVAL; |
| 4557 | |
| 4558 | |
| 4559 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { |
| 4560 | if (cmd_match(page, "frozen")) |
| 4561 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 4562 | else |
| 4563 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 4564 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
| 4565 | mddev_lock(mddev) == 0) { |
| 4566 | flush_workqueue(md_misc_wq); |
| 4567 | if (mddev->sync_thread) { |
| 4568 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 4569 | md_reap_sync_thread(mddev); |
| 4570 | } |
| 4571 | mddev_unlock(mddev); |
| 4572 | } |
| 4573 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 4574 | return -EBUSY; |
| 4575 | else if (cmd_match(page, "resync")) |
| 4576 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 4577 | else if (cmd_match(page, "recover")) { |
| 4578 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 4579 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 4580 | } else if (cmd_match(page, "reshape")) { |
| 4581 | int err; |
| 4582 | if (mddev->pers->start_reshape == NULL) |
| 4583 | return -EINVAL; |
| 4584 | err = mddev_lock(mddev); |
| 4585 | if (!err) { |
| 4586 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 4587 | err = -EBUSY; |
| 4588 | else { |
| 4589 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 4590 | err = mddev->pers->start_reshape(mddev); |
| 4591 | } |
| 4592 | mddev_unlock(mddev); |
| 4593 | } |
| 4594 | if (err) |
| 4595 | return err; |
| 4596 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| 4597 | } else { |
| 4598 | if (cmd_match(page, "check")) |
| 4599 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 4600 | else if (!cmd_match(page, "repair")) |
| 4601 | return -EINVAL; |
| 4602 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 4603 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
| 4604 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 4605 | } |
| 4606 | if (mddev->ro == 2) { |
| 4607 | /* A write to sync_action is enough to justify |
| 4608 | * canceling read-auto mode |
| 4609 | */ |
| 4610 | mddev->ro = 0; |
| 4611 | md_wakeup_thread(mddev->sync_thread); |
| 4612 | } |
| 4613 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 4614 | md_wakeup_thread(mddev->thread); |
| 4615 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
| 4616 | return len; |
| 4617 | } |
| 4618 | |
| 4619 | static struct md_sysfs_entry md_scan_mode = |
| 4620 | __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
| 4621 | |
| 4622 | static ssize_t |
| 4623 | last_sync_action_show(struct mddev *mddev, char *page) |
| 4624 | { |
| 4625 | return sprintf(page, "%s\n", mddev->last_sync_action); |
| 4626 | } |
| 4627 | |
| 4628 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); |
| 4629 | |
| 4630 | static ssize_t |
| 4631 | mismatch_cnt_show(struct mddev *mddev, char *page) |
| 4632 | { |
| 4633 | return sprintf(page, "%llu\n", |
| 4634 | (unsigned long long) |
| 4635 | atomic64_read(&mddev->resync_mismatches)); |
| 4636 | } |
| 4637 | |
| 4638 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
| 4639 | |
| 4640 | static ssize_t |
| 4641 | sync_min_show(struct mddev *mddev, char *page) |
| 4642 | { |
| 4643 | return sprintf(page, "%d (%s)\n", speed_min(mddev), |
| 4644 | mddev->sync_speed_min ? "local": "system"); |
| 4645 | } |
| 4646 | |
| 4647 | static ssize_t |
| 4648 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
| 4649 | { |
| 4650 | unsigned int min; |
| 4651 | int rv; |
| 4652 | |
| 4653 | if (strncmp(buf, "system", 6)==0) { |
| 4654 | min = 0; |
| 4655 | } else { |
| 4656 | rv = kstrtouint(buf, 10, &min); |
| 4657 | if (rv < 0) |
| 4658 | return rv; |
| 4659 | if (min == 0) |
| 4660 | return -EINVAL; |
| 4661 | } |
| 4662 | mddev->sync_speed_min = min; |
| 4663 | return len; |
| 4664 | } |
| 4665 | |
| 4666 | static struct md_sysfs_entry md_sync_min = |
| 4667 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); |
| 4668 | |
| 4669 | static ssize_t |
| 4670 | sync_max_show(struct mddev *mddev, char *page) |
| 4671 | { |
| 4672 | return sprintf(page, "%d (%s)\n", speed_max(mddev), |
| 4673 | mddev->sync_speed_max ? "local": "system"); |
| 4674 | } |
| 4675 | |
| 4676 | static ssize_t |
| 4677 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
| 4678 | { |
| 4679 | unsigned int max; |
| 4680 | int rv; |
| 4681 | |
| 4682 | if (strncmp(buf, "system", 6)==0) { |
| 4683 | max = 0; |
| 4684 | } else { |
| 4685 | rv = kstrtouint(buf, 10, &max); |
| 4686 | if (rv < 0) |
| 4687 | return rv; |
| 4688 | if (max == 0) |
| 4689 | return -EINVAL; |
| 4690 | } |
| 4691 | mddev->sync_speed_max = max; |
| 4692 | return len; |
| 4693 | } |
| 4694 | |
| 4695 | static struct md_sysfs_entry md_sync_max = |
| 4696 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); |
| 4697 | |
| 4698 | static ssize_t |
| 4699 | degraded_show(struct mddev *mddev, char *page) |
| 4700 | { |
| 4701 | return sprintf(page, "%d\n", mddev->degraded); |
| 4702 | } |
| 4703 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); |
| 4704 | |
| 4705 | static ssize_t |
| 4706 | sync_force_parallel_show(struct mddev *mddev, char *page) |
| 4707 | { |
| 4708 | return sprintf(page, "%d\n", mddev->parallel_resync); |
| 4709 | } |
| 4710 | |
| 4711 | static ssize_t |
| 4712 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
| 4713 | { |
| 4714 | long n; |
| 4715 | |
| 4716 | if (kstrtol(buf, 10, &n)) |
| 4717 | return -EINVAL; |
| 4718 | |
| 4719 | if (n != 0 && n != 1) |
| 4720 | return -EINVAL; |
| 4721 | |
| 4722 | mddev->parallel_resync = n; |
| 4723 | |
| 4724 | if (mddev->sync_thread) |
| 4725 | wake_up(&resync_wait); |
| 4726 | |
| 4727 | return len; |
| 4728 | } |
| 4729 | |
| 4730 | /* force parallel resync, even with shared block devices */ |
| 4731 | static struct md_sysfs_entry md_sync_force_parallel = |
| 4732 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, |
| 4733 | sync_force_parallel_show, sync_force_parallel_store); |
| 4734 | |
| 4735 | static ssize_t |
| 4736 | sync_speed_show(struct mddev *mddev, char *page) |
| 4737 | { |
| 4738 | unsigned long resync, dt, db; |
| 4739 | if (mddev->curr_resync == 0) |
| 4740 | return sprintf(page, "none\n"); |
| 4741 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
| 4742 | dt = (jiffies - mddev->resync_mark) / HZ; |
| 4743 | if (!dt) dt++; |
| 4744 | db = resync - mddev->resync_mark_cnt; |
| 4745 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ |
| 4746 | } |
| 4747 | |
| 4748 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
| 4749 | |
| 4750 | static ssize_t |
| 4751 | sync_completed_show(struct mddev *mddev, char *page) |
| 4752 | { |
| 4753 | unsigned long long max_sectors, resync; |
| 4754 | |
| 4755 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 4756 | return sprintf(page, "none\n"); |
| 4757 | |
| 4758 | if (mddev->curr_resync == 1 || |
| 4759 | mddev->curr_resync == 2) |
| 4760 | return sprintf(page, "delayed\n"); |
| 4761 | |
| 4762 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
| 4763 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 4764 | max_sectors = mddev->resync_max_sectors; |
| 4765 | else |
| 4766 | max_sectors = mddev->dev_sectors; |
| 4767 | |
| 4768 | resync = mddev->curr_resync_completed; |
| 4769 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
| 4770 | } |
| 4771 | |
| 4772 | static struct md_sysfs_entry md_sync_completed = |
| 4773 | __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); |
| 4774 | |
| 4775 | static ssize_t |
| 4776 | min_sync_show(struct mddev *mddev, char *page) |
| 4777 | { |
| 4778 | return sprintf(page, "%llu\n", |
| 4779 | (unsigned long long)mddev->resync_min); |
| 4780 | } |
| 4781 | static ssize_t |
| 4782 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
| 4783 | { |
| 4784 | unsigned long long min; |
| 4785 | int err; |
| 4786 | |
| 4787 | if (kstrtoull(buf, 10, &min)) |
| 4788 | return -EINVAL; |
| 4789 | |
| 4790 | spin_lock(&mddev->lock); |
| 4791 | err = -EINVAL; |
| 4792 | if (min > mddev->resync_max) |
| 4793 | goto out_unlock; |
| 4794 | |
| 4795 | err = -EBUSY; |
| 4796 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 4797 | goto out_unlock; |
| 4798 | |
| 4799 | /* Round down to multiple of 4K for safety */ |
| 4800 | mddev->resync_min = round_down(min, 8); |
| 4801 | err = 0; |
| 4802 | |
| 4803 | out_unlock: |
| 4804 | spin_unlock(&mddev->lock); |
| 4805 | return err ?: len; |
| 4806 | } |
| 4807 | |
| 4808 | static struct md_sysfs_entry md_min_sync = |
| 4809 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); |
| 4810 | |
| 4811 | static ssize_t |
| 4812 | max_sync_show(struct mddev *mddev, char *page) |
| 4813 | { |
| 4814 | if (mddev->resync_max == MaxSector) |
| 4815 | return sprintf(page, "max\n"); |
| 4816 | else |
| 4817 | return sprintf(page, "%llu\n", |
| 4818 | (unsigned long long)mddev->resync_max); |
| 4819 | } |
| 4820 | static ssize_t |
| 4821 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
| 4822 | { |
| 4823 | int err; |
| 4824 | spin_lock(&mddev->lock); |
| 4825 | if (strncmp(buf, "max", 3) == 0) |
| 4826 | mddev->resync_max = MaxSector; |
| 4827 | else { |
| 4828 | unsigned long long max; |
| 4829 | int chunk; |
| 4830 | |
| 4831 | err = -EINVAL; |
| 4832 | if (kstrtoull(buf, 10, &max)) |
| 4833 | goto out_unlock; |
| 4834 | if (max < mddev->resync_min) |
| 4835 | goto out_unlock; |
| 4836 | |
| 4837 | err = -EBUSY; |
| 4838 | if (max < mddev->resync_max && |
| 4839 | mddev->ro == 0 && |
| 4840 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 4841 | goto out_unlock; |
| 4842 | |
| 4843 | /* Must be a multiple of chunk_size */ |
| 4844 | chunk = mddev->chunk_sectors; |
| 4845 | if (chunk) { |
| 4846 | sector_t temp = max; |
| 4847 | |
| 4848 | err = -EINVAL; |
| 4849 | if (sector_div(temp, chunk)) |
| 4850 | goto out_unlock; |
| 4851 | } |
| 4852 | mddev->resync_max = max; |
| 4853 | } |
| 4854 | wake_up(&mddev->recovery_wait); |
| 4855 | err = 0; |
| 4856 | out_unlock: |
| 4857 | spin_unlock(&mddev->lock); |
| 4858 | return err ?: len; |
| 4859 | } |
| 4860 | |
| 4861 | static struct md_sysfs_entry md_max_sync = |
| 4862 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); |
| 4863 | |
| 4864 | static ssize_t |
| 4865 | suspend_lo_show(struct mddev *mddev, char *page) |
| 4866 | { |
| 4867 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); |
| 4868 | } |
| 4869 | |
| 4870 | static ssize_t |
| 4871 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
| 4872 | { |
| 4873 | unsigned long long new; |
| 4874 | int err; |
| 4875 | |
| 4876 | err = kstrtoull(buf, 10, &new); |
| 4877 | if (err < 0) |
| 4878 | return err; |
| 4879 | if (new != (sector_t)new) |
| 4880 | return -EINVAL; |
| 4881 | |
| 4882 | err = mddev_lock(mddev); |
| 4883 | if (err) |
| 4884 | return err; |
| 4885 | err = -EINVAL; |
| 4886 | if (mddev->pers == NULL || |
| 4887 | mddev->pers->quiesce == NULL) |
| 4888 | goto unlock; |
| 4889 | mddev_suspend(mddev); |
| 4890 | mddev->suspend_lo = new; |
| 4891 | mddev_resume(mddev); |
| 4892 | |
| 4893 | err = 0; |
| 4894 | unlock: |
| 4895 | mddev_unlock(mddev); |
| 4896 | return err ?: len; |
| 4897 | } |
| 4898 | static struct md_sysfs_entry md_suspend_lo = |
| 4899 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); |
| 4900 | |
| 4901 | static ssize_t |
| 4902 | suspend_hi_show(struct mddev *mddev, char *page) |
| 4903 | { |
| 4904 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); |
| 4905 | } |
| 4906 | |
| 4907 | static ssize_t |
| 4908 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
| 4909 | { |
| 4910 | unsigned long long new; |
| 4911 | int err; |
| 4912 | |
| 4913 | err = kstrtoull(buf, 10, &new); |
| 4914 | if (err < 0) |
| 4915 | return err; |
| 4916 | if (new != (sector_t)new) |
| 4917 | return -EINVAL; |
| 4918 | |
| 4919 | err = mddev_lock(mddev); |
| 4920 | if (err) |
| 4921 | return err; |
| 4922 | err = -EINVAL; |
| 4923 | if (mddev->pers == NULL) |
| 4924 | goto unlock; |
| 4925 | |
| 4926 | mddev_suspend(mddev); |
| 4927 | mddev->suspend_hi = new; |
| 4928 | mddev_resume(mddev); |
| 4929 | |
| 4930 | err = 0; |
| 4931 | unlock: |
| 4932 | mddev_unlock(mddev); |
| 4933 | return err ?: len; |
| 4934 | } |
| 4935 | static struct md_sysfs_entry md_suspend_hi = |
| 4936 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); |
| 4937 | |
| 4938 | static ssize_t |
| 4939 | reshape_position_show(struct mddev *mddev, char *page) |
| 4940 | { |
| 4941 | if (mddev->reshape_position != MaxSector) |
| 4942 | return sprintf(page, "%llu\n", |
| 4943 | (unsigned long long)mddev->reshape_position); |
| 4944 | strcpy(page, "none\n"); |
| 4945 | return 5; |
| 4946 | } |
| 4947 | |
| 4948 | static ssize_t |
| 4949 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
| 4950 | { |
| 4951 | struct md_rdev *rdev; |
| 4952 | unsigned long long new; |
| 4953 | int err; |
| 4954 | |
| 4955 | err = kstrtoull(buf, 10, &new); |
| 4956 | if (err < 0) |
| 4957 | return err; |
| 4958 | if (new != (sector_t)new) |
| 4959 | return -EINVAL; |
| 4960 | err = mddev_lock(mddev); |
| 4961 | if (err) |
| 4962 | return err; |
| 4963 | err = -EBUSY; |
| 4964 | if (mddev->pers) |
| 4965 | goto unlock; |
| 4966 | mddev->reshape_position = new; |
| 4967 | mddev->delta_disks = 0; |
| 4968 | mddev->reshape_backwards = 0; |
| 4969 | mddev->new_level = mddev->level; |
| 4970 | mddev->new_layout = mddev->layout; |
| 4971 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 4972 | rdev_for_each(rdev, mddev) |
| 4973 | rdev->new_data_offset = rdev->data_offset; |
| 4974 | err = 0; |
| 4975 | unlock: |
| 4976 | mddev_unlock(mddev); |
| 4977 | return err ?: len; |
| 4978 | } |
| 4979 | |
| 4980 | static struct md_sysfs_entry md_reshape_position = |
| 4981 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, |
| 4982 | reshape_position_store); |
| 4983 | |
| 4984 | static ssize_t |
| 4985 | reshape_direction_show(struct mddev *mddev, char *page) |
| 4986 | { |
| 4987 | return sprintf(page, "%s\n", |
| 4988 | mddev->reshape_backwards ? "backwards" : "forwards"); |
| 4989 | } |
| 4990 | |
| 4991 | static ssize_t |
| 4992 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) |
| 4993 | { |
| 4994 | int backwards = 0; |
| 4995 | int err; |
| 4996 | |
| 4997 | if (cmd_match(buf, "forwards")) |
| 4998 | backwards = 0; |
| 4999 | else if (cmd_match(buf, "backwards")) |
| 5000 | backwards = 1; |
| 5001 | else |
| 5002 | return -EINVAL; |
| 5003 | if (mddev->reshape_backwards == backwards) |
| 5004 | return len; |
| 5005 | |
| 5006 | err = mddev_lock(mddev); |
| 5007 | if (err) |
| 5008 | return err; |
| 5009 | /* check if we are allowed to change */ |
| 5010 | if (mddev->delta_disks) |
| 5011 | err = -EBUSY; |
| 5012 | else if (mddev->persistent && |
| 5013 | mddev->major_version == 0) |
| 5014 | err = -EINVAL; |
| 5015 | else |
| 5016 | mddev->reshape_backwards = backwards; |
| 5017 | mddev_unlock(mddev); |
| 5018 | return err ?: len; |
| 5019 | } |
| 5020 | |
| 5021 | static struct md_sysfs_entry md_reshape_direction = |
| 5022 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, |
| 5023 | reshape_direction_store); |
| 5024 | |
| 5025 | static ssize_t |
| 5026 | array_size_show(struct mddev *mddev, char *page) |
| 5027 | { |
| 5028 | if (mddev->external_size) |
| 5029 | return sprintf(page, "%llu\n", |
| 5030 | (unsigned long long)mddev->array_sectors/2); |
| 5031 | else |
| 5032 | return sprintf(page, "default\n"); |
| 5033 | } |
| 5034 | |
| 5035 | static ssize_t |
| 5036 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
| 5037 | { |
| 5038 | sector_t sectors; |
| 5039 | int err; |
| 5040 | |
| 5041 | err = mddev_lock(mddev); |
| 5042 | if (err) |
| 5043 | return err; |
| 5044 | |
| 5045 | /* cluster raid doesn't support change array_sectors */ |
| 5046 | if (mddev_is_clustered(mddev)) { |
| 5047 | mddev_unlock(mddev); |
| 5048 | return -EINVAL; |
| 5049 | } |
| 5050 | |
| 5051 | if (strncmp(buf, "default", 7) == 0) { |
| 5052 | if (mddev->pers) |
| 5053 | sectors = mddev->pers->size(mddev, 0, 0); |
| 5054 | else |
| 5055 | sectors = mddev->array_sectors; |
| 5056 | |
| 5057 | mddev->external_size = 0; |
| 5058 | } else { |
| 5059 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
| 5060 | err = -EINVAL; |
| 5061 | else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) |
| 5062 | err = -E2BIG; |
| 5063 | else |
| 5064 | mddev->external_size = 1; |
| 5065 | } |
| 5066 | |
| 5067 | if (!err) { |
| 5068 | mddev->array_sectors = sectors; |
| 5069 | if (mddev->pers) { |
| 5070 | set_capacity(mddev->gendisk, mddev->array_sectors); |
| 5071 | revalidate_disk(mddev->gendisk); |
| 5072 | } |
| 5073 | } |
| 5074 | mddev_unlock(mddev); |
| 5075 | return err ?: len; |
| 5076 | } |
| 5077 | |
| 5078 | static struct md_sysfs_entry md_array_size = |
| 5079 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, |
| 5080 | array_size_store); |
| 5081 | |
| 5082 | static ssize_t |
| 5083 | consistency_policy_show(struct mddev *mddev, char *page) |
| 5084 | { |
| 5085 | int ret; |
| 5086 | |
| 5087 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
| 5088 | ret = sprintf(page, "journal\n"); |
| 5089 | } else if (test_bit(MD_HAS_PPL, &mddev->flags)) { |
| 5090 | ret = sprintf(page, "ppl\n"); |
| 5091 | } else if (mddev->bitmap) { |
| 5092 | ret = sprintf(page, "bitmap\n"); |
| 5093 | } else if (mddev->pers) { |
| 5094 | if (mddev->pers->sync_request) |
| 5095 | ret = sprintf(page, "resync\n"); |
| 5096 | else |
| 5097 | ret = sprintf(page, "none\n"); |
| 5098 | } else { |
| 5099 | ret = sprintf(page, "unknown\n"); |
| 5100 | } |
| 5101 | |
| 5102 | return ret; |
| 5103 | } |
| 5104 | |
| 5105 | static ssize_t |
| 5106 | consistency_policy_store(struct mddev *mddev, const char *buf, size_t len) |
| 5107 | { |
| 5108 | int err = 0; |
| 5109 | |
| 5110 | if (mddev->pers) { |
| 5111 | if (mddev->pers->change_consistency_policy) |
| 5112 | err = mddev->pers->change_consistency_policy(mddev, buf); |
| 5113 | else |
| 5114 | err = -EBUSY; |
| 5115 | } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) { |
| 5116 | set_bit(MD_HAS_PPL, &mddev->flags); |
| 5117 | } else { |
| 5118 | err = -EINVAL; |
| 5119 | } |
| 5120 | |
| 5121 | return err ? err : len; |
| 5122 | } |
| 5123 | |
| 5124 | static struct md_sysfs_entry md_consistency_policy = |
| 5125 | __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show, |
| 5126 | consistency_policy_store); |
| 5127 | |
| 5128 | static struct attribute *md_default_attrs[] = { |
| 5129 | &md_level.attr, |
| 5130 | &md_layout.attr, |
| 5131 | &md_raid_disks.attr, |
| 5132 | &md_chunk_size.attr, |
| 5133 | &md_size.attr, |
| 5134 | &md_resync_start.attr, |
| 5135 | &md_metadata.attr, |
| 5136 | &md_new_device.attr, |
| 5137 | &md_safe_delay.attr, |
| 5138 | &md_array_state.attr, |
| 5139 | &md_reshape_position.attr, |
| 5140 | &md_reshape_direction.attr, |
| 5141 | &md_array_size.attr, |
| 5142 | &max_corr_read_errors.attr, |
| 5143 | &md_consistency_policy.attr, |
| 5144 | NULL, |
| 5145 | }; |
| 5146 | |
| 5147 | static struct attribute *md_redundancy_attrs[] = { |
| 5148 | &md_scan_mode.attr, |
| 5149 | &md_last_scan_mode.attr, |
| 5150 | &md_mismatches.attr, |
| 5151 | &md_sync_min.attr, |
| 5152 | &md_sync_max.attr, |
| 5153 | &md_sync_speed.attr, |
| 5154 | &md_sync_force_parallel.attr, |
| 5155 | &md_sync_completed.attr, |
| 5156 | &md_min_sync.attr, |
| 5157 | &md_max_sync.attr, |
| 5158 | &md_suspend_lo.attr, |
| 5159 | &md_suspend_hi.attr, |
| 5160 | &md_bitmap.attr, |
| 5161 | &md_degraded.attr, |
| 5162 | NULL, |
| 5163 | }; |
| 5164 | static struct attribute_group md_redundancy_group = { |
| 5165 | .name = NULL, |
| 5166 | .attrs = md_redundancy_attrs, |
| 5167 | }; |
| 5168 | |
| 5169 | static ssize_t |
| 5170 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) |
| 5171 | { |
| 5172 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); |
| 5173 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
| 5174 | ssize_t rv; |
| 5175 | |
| 5176 | if (!entry->show) |
| 5177 | return -EIO; |
| 5178 | spin_lock(&all_mddevs_lock); |
| 5179 | if (list_empty(&mddev->all_mddevs)) { |
| 5180 | spin_unlock(&all_mddevs_lock); |
| 5181 | return -EBUSY; |
| 5182 | } |
| 5183 | mddev_get(mddev); |
| 5184 | spin_unlock(&all_mddevs_lock); |
| 5185 | |
| 5186 | rv = entry->show(mddev, page); |
| 5187 | mddev_put(mddev); |
| 5188 | return rv; |
| 5189 | } |
| 5190 | |
| 5191 | static ssize_t |
| 5192 | md_attr_store(struct kobject *kobj, struct attribute *attr, |
| 5193 | const char *page, size_t length) |
| 5194 | { |
| 5195 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); |
| 5196 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
| 5197 | ssize_t rv; |
| 5198 | |
| 5199 | if (!entry->store) |
| 5200 | return -EIO; |
| 5201 | if (!capable(CAP_SYS_ADMIN)) |
| 5202 | return -EACCES; |
| 5203 | spin_lock(&all_mddevs_lock); |
| 5204 | if (list_empty(&mddev->all_mddevs)) { |
| 5205 | spin_unlock(&all_mddevs_lock); |
| 5206 | return -EBUSY; |
| 5207 | } |
| 5208 | mddev_get(mddev); |
| 5209 | spin_unlock(&all_mddevs_lock); |
| 5210 | rv = entry->store(mddev, page, length); |
| 5211 | mddev_put(mddev); |
| 5212 | return rv; |
| 5213 | } |
| 5214 | |
| 5215 | static void md_free(struct kobject *ko) |
| 5216 | { |
| 5217 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
| 5218 | |
| 5219 | if (mddev->sysfs_state) |
| 5220 | sysfs_put(mddev->sysfs_state); |
| 5221 | |
| 5222 | if (mddev->gendisk) |
| 5223 | del_gendisk(mddev->gendisk); |
| 5224 | if (mddev->queue) |
| 5225 | blk_cleanup_queue(mddev->queue); |
| 5226 | if (mddev->gendisk) |
| 5227 | put_disk(mddev->gendisk); |
| 5228 | percpu_ref_exit(&mddev->writes_pending); |
| 5229 | |
| 5230 | bioset_exit(&mddev->bio_set); |
| 5231 | bioset_exit(&mddev->sync_set); |
| 5232 | kfree(mddev); |
| 5233 | } |
| 5234 | |
| 5235 | static const struct sysfs_ops md_sysfs_ops = { |
| 5236 | .show = md_attr_show, |
| 5237 | .store = md_attr_store, |
| 5238 | }; |
| 5239 | static struct kobj_type md_ktype = { |
| 5240 | .release = md_free, |
| 5241 | .sysfs_ops = &md_sysfs_ops, |
| 5242 | .default_attrs = md_default_attrs, |
| 5243 | }; |
| 5244 | |
| 5245 | int mdp_major = 0; |
| 5246 | |
| 5247 | static void mddev_delayed_delete(struct work_struct *ws) |
| 5248 | { |
| 5249 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
| 5250 | |
| 5251 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
| 5252 | kobject_del(&mddev->kobj); |
| 5253 | kobject_put(&mddev->kobj); |
| 5254 | } |
| 5255 | |
| 5256 | static void no_op(struct percpu_ref *r) {} |
| 5257 | |
| 5258 | int mddev_init_writes_pending(struct mddev *mddev) |
| 5259 | { |
| 5260 | if (mddev->writes_pending.percpu_count_ptr) |
| 5261 | return 0; |
| 5262 | if (percpu_ref_init(&mddev->writes_pending, no_op, 0, GFP_KERNEL) < 0) |
| 5263 | return -ENOMEM; |
| 5264 | /* We want to start with the refcount at zero */ |
| 5265 | percpu_ref_put(&mddev->writes_pending); |
| 5266 | return 0; |
| 5267 | } |
| 5268 | EXPORT_SYMBOL_GPL(mddev_init_writes_pending); |
| 5269 | |
| 5270 | static int md_alloc(dev_t dev, char *name) |
| 5271 | { |
| 5272 | /* |
| 5273 | * If dev is zero, name is the name of a device to allocate with |
| 5274 | * an arbitrary minor number. It will be "md_???" |
| 5275 | * If dev is non-zero it must be a device number with a MAJOR of |
| 5276 | * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then |
| 5277 | * the device is being created by opening a node in /dev. |
| 5278 | * If "name" is not NULL, the device is being created by |
| 5279 | * writing to /sys/module/md_mod/parameters/new_array. |
| 5280 | */ |
| 5281 | static DEFINE_MUTEX(disks_mutex); |
| 5282 | struct mddev *mddev = mddev_find(dev); |
| 5283 | struct gendisk *disk; |
| 5284 | int partitioned; |
| 5285 | int shift; |
| 5286 | int unit; |
| 5287 | int error; |
| 5288 | |
| 5289 | if (!mddev) |
| 5290 | return -ENODEV; |
| 5291 | |
| 5292 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); |
| 5293 | shift = partitioned ? MdpMinorShift : 0; |
| 5294 | unit = MINOR(mddev->unit) >> shift; |
| 5295 | |
| 5296 | /* wait for any previous instance of this device to be |
| 5297 | * completely removed (mddev_delayed_delete). |
| 5298 | */ |
| 5299 | flush_workqueue(md_misc_wq); |
| 5300 | |
| 5301 | mutex_lock(&disks_mutex); |
| 5302 | error = -EEXIST; |
| 5303 | if (mddev->gendisk) |
| 5304 | goto abort; |
| 5305 | |
| 5306 | if (name && !dev) { |
| 5307 | /* Need to ensure that 'name' is not a duplicate. |
| 5308 | */ |
| 5309 | struct mddev *mddev2; |
| 5310 | spin_lock(&all_mddevs_lock); |
| 5311 | |
| 5312 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) |
| 5313 | if (mddev2->gendisk && |
| 5314 | strcmp(mddev2->gendisk->disk_name, name) == 0) { |
| 5315 | spin_unlock(&all_mddevs_lock); |
| 5316 | goto abort; |
| 5317 | } |
| 5318 | spin_unlock(&all_mddevs_lock); |
| 5319 | } |
| 5320 | if (name && dev) |
| 5321 | /* |
| 5322 | * Creating /dev/mdNNN via "newarray", so adjust hold_active. |
| 5323 | */ |
| 5324 | mddev->hold_active = UNTIL_STOP; |
| 5325 | |
| 5326 | error = -ENOMEM; |
| 5327 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
| 5328 | if (!mddev->queue) |
| 5329 | goto abort; |
| 5330 | mddev->queue->queuedata = mddev; |
| 5331 | |
| 5332 | blk_queue_make_request(mddev->queue, md_make_request); |
| 5333 | blk_set_stacking_limits(&mddev->queue->limits); |
| 5334 | |
| 5335 | disk = alloc_disk(1 << shift); |
| 5336 | if (!disk) { |
| 5337 | blk_cleanup_queue(mddev->queue); |
| 5338 | mddev->queue = NULL; |
| 5339 | goto abort; |
| 5340 | } |
| 5341 | disk->major = MAJOR(mddev->unit); |
| 5342 | disk->first_minor = unit << shift; |
| 5343 | if (name) |
| 5344 | strcpy(disk->disk_name, name); |
| 5345 | else if (partitioned) |
| 5346 | sprintf(disk->disk_name, "md_d%d", unit); |
| 5347 | else |
| 5348 | sprintf(disk->disk_name, "md%d", unit); |
| 5349 | disk->fops = &md_fops; |
| 5350 | disk->private_data = mddev; |
| 5351 | disk->queue = mddev->queue; |
| 5352 | blk_queue_write_cache(mddev->queue, true, true); |
| 5353 | /* Allow extended partitions. This makes the |
| 5354 | * 'mdp' device redundant, but we can't really |
| 5355 | * remove it now. |
| 5356 | */ |
| 5357 | disk->flags |= GENHD_FL_EXT_DEVT; |
| 5358 | mddev->gendisk = disk; |
| 5359 | /* As soon as we call add_disk(), another thread could get |
| 5360 | * through to md_open, so make sure it doesn't get too far |
| 5361 | */ |
| 5362 | mutex_lock(&mddev->open_mutex); |
| 5363 | add_disk(disk); |
| 5364 | |
| 5365 | error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md"); |
| 5366 | if (error) { |
| 5367 | /* This isn't possible, but as kobject_init_and_add is marked |
| 5368 | * __must_check, we must do something with the result |
| 5369 | */ |
| 5370 | pr_debug("md: cannot register %s/md - name in use\n", |
| 5371 | disk->disk_name); |
| 5372 | error = 0; |
| 5373 | } |
| 5374 | if (mddev->kobj.sd && |
| 5375 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) |
| 5376 | pr_debug("pointless warning\n"); |
| 5377 | mutex_unlock(&mddev->open_mutex); |
| 5378 | abort: |
| 5379 | mutex_unlock(&disks_mutex); |
| 5380 | if (!error && mddev->kobj.sd) { |
| 5381 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
| 5382 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
| 5383 | } |
| 5384 | mddev_put(mddev); |
| 5385 | return error; |
| 5386 | } |
| 5387 | |
| 5388 | static struct kobject *md_probe(dev_t dev, int *part, void *data) |
| 5389 | { |
| 5390 | if (create_on_open) |
| 5391 | md_alloc(dev, NULL); |
| 5392 | return NULL; |
| 5393 | } |
| 5394 | |
| 5395 | static int add_named_array(const char *val, const struct kernel_param *kp) |
| 5396 | { |
| 5397 | /* |
| 5398 | * val must be "md_*" or "mdNNN". |
| 5399 | * For "md_*" we allocate an array with a large free minor number, and |
| 5400 | * set the name to val. val must not already be an active name. |
| 5401 | * For "mdNNN" we allocate an array with the minor number NNN |
| 5402 | * which must not already be in use. |
| 5403 | */ |
| 5404 | int len = strlen(val); |
| 5405 | char buf[DISK_NAME_LEN]; |
| 5406 | unsigned long devnum; |
| 5407 | |
| 5408 | while (len && val[len-1] == '\n') |
| 5409 | len--; |
| 5410 | if (len >= DISK_NAME_LEN) |
| 5411 | return -E2BIG; |
| 5412 | strlcpy(buf, val, len+1); |
| 5413 | if (strncmp(buf, "md_", 3) == 0) |
| 5414 | return md_alloc(0, buf); |
| 5415 | if (strncmp(buf, "md", 2) == 0 && |
| 5416 | isdigit(buf[2]) && |
| 5417 | kstrtoul(buf+2, 10, &devnum) == 0 && |
| 5418 | devnum <= MINORMASK) |
| 5419 | return md_alloc(MKDEV(MD_MAJOR, devnum), NULL); |
| 5420 | |
| 5421 | return -EINVAL; |
| 5422 | } |
| 5423 | |
| 5424 | static void md_safemode_timeout(struct timer_list *t) |
| 5425 | { |
| 5426 | struct mddev *mddev = from_timer(mddev, t, safemode_timer); |
| 5427 | |
| 5428 | mddev->safemode = 1; |
| 5429 | if (mddev->external) |
| 5430 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 5431 | |
| 5432 | md_wakeup_thread(mddev->thread); |
| 5433 | } |
| 5434 | |
| 5435 | static int start_dirty_degraded; |
| 5436 | |
| 5437 | int md_run(struct mddev *mddev) |
| 5438 | { |
| 5439 | int err; |
| 5440 | struct md_rdev *rdev; |
| 5441 | struct md_personality *pers; |
| 5442 | |
| 5443 | if (list_empty(&mddev->disks)) |
| 5444 | /* cannot run an array with no devices.. */ |
| 5445 | return -EINVAL; |
| 5446 | |
| 5447 | if (mddev->pers) |
| 5448 | return -EBUSY; |
| 5449 | /* Cannot run until previous stop completes properly */ |
| 5450 | if (mddev->sysfs_active) |
| 5451 | return -EBUSY; |
| 5452 | |
| 5453 | /* |
| 5454 | * Analyze all RAID superblock(s) |
| 5455 | */ |
| 5456 | if (!mddev->raid_disks) { |
| 5457 | if (!mddev->persistent) |
| 5458 | return -EINVAL; |
| 5459 | analyze_sbs(mddev); |
| 5460 | } |
| 5461 | |
| 5462 | if (mddev->level != LEVEL_NONE) |
| 5463 | request_module("md-level-%d", mddev->level); |
| 5464 | else if (mddev->clevel[0]) |
| 5465 | request_module("md-%s", mddev->clevel); |
| 5466 | |
| 5467 | /* |
| 5468 | * Drop all container device buffers, from now on |
| 5469 | * the only valid external interface is through the md |
| 5470 | * device. |
| 5471 | */ |
| 5472 | mddev->has_superblocks = false; |
| 5473 | rdev_for_each(rdev, mddev) { |
| 5474 | if (test_bit(Faulty, &rdev->flags)) |
| 5475 | continue; |
| 5476 | sync_blockdev(rdev->bdev); |
| 5477 | invalidate_bdev(rdev->bdev); |
| 5478 | if (mddev->ro != 1 && |
| 5479 | (bdev_read_only(rdev->bdev) || |
| 5480 | bdev_read_only(rdev->meta_bdev))) { |
| 5481 | mddev->ro = 1; |
| 5482 | if (mddev->gendisk) |
| 5483 | set_disk_ro(mddev->gendisk, 1); |
| 5484 | } |
| 5485 | |
| 5486 | if (rdev->sb_page) |
| 5487 | mddev->has_superblocks = true; |
| 5488 | |
| 5489 | /* perform some consistency tests on the device. |
| 5490 | * We don't want the data to overlap the metadata, |
| 5491 | * Internal Bitmap issues have been handled elsewhere. |
| 5492 | */ |
| 5493 | if (rdev->meta_bdev) { |
| 5494 | /* Nothing to check */; |
| 5495 | } else if (rdev->data_offset < rdev->sb_start) { |
| 5496 | if (mddev->dev_sectors && |
| 5497 | rdev->data_offset + mddev->dev_sectors |
| 5498 | > rdev->sb_start) { |
| 5499 | pr_warn("md: %s: data overlaps metadata\n", |
| 5500 | mdname(mddev)); |
| 5501 | return -EINVAL; |
| 5502 | } |
| 5503 | } else { |
| 5504 | if (rdev->sb_start + rdev->sb_size/512 |
| 5505 | > rdev->data_offset) { |
| 5506 | pr_warn("md: %s: metadata overlaps data\n", |
| 5507 | mdname(mddev)); |
| 5508 | return -EINVAL; |
| 5509 | } |
| 5510 | } |
| 5511 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
| 5512 | } |
| 5513 | |
| 5514 | if (!bioset_initialized(&mddev->bio_set)) { |
| 5515 | err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
| 5516 | if (err) |
| 5517 | return err; |
| 5518 | } |
| 5519 | if (!bioset_initialized(&mddev->sync_set)) { |
| 5520 | err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
| 5521 | if (err) |
| 5522 | return err; |
| 5523 | } |
| 5524 | if (mddev->flush_pool == NULL) { |
| 5525 | mddev->flush_pool = mempool_create(NR_FLUSH_INFOS, flush_info_alloc, |
| 5526 | flush_info_free, mddev); |
| 5527 | if (!mddev->flush_pool) { |
| 5528 | err = -ENOMEM; |
| 5529 | goto abort; |
| 5530 | } |
| 5531 | } |
| 5532 | if (mddev->flush_bio_pool == NULL) { |
| 5533 | mddev->flush_bio_pool = mempool_create(NR_FLUSH_BIOS, flush_bio_alloc, |
| 5534 | flush_bio_free, mddev); |
| 5535 | if (!mddev->flush_bio_pool) { |
| 5536 | err = -ENOMEM; |
| 5537 | goto abort; |
| 5538 | } |
| 5539 | } |
| 5540 | |
| 5541 | spin_lock(&pers_lock); |
| 5542 | pers = find_pers(mddev->level, mddev->clevel); |
| 5543 | if (!pers || !try_module_get(pers->owner)) { |
| 5544 | spin_unlock(&pers_lock); |
| 5545 | if (mddev->level != LEVEL_NONE) |
| 5546 | pr_warn("md: personality for level %d is not loaded!\n", |
| 5547 | mddev->level); |
| 5548 | else |
| 5549 | pr_warn("md: personality for level %s is not loaded!\n", |
| 5550 | mddev->clevel); |
| 5551 | err = -EINVAL; |
| 5552 | goto abort; |
| 5553 | } |
| 5554 | spin_unlock(&pers_lock); |
| 5555 | if (mddev->level != pers->level) { |
| 5556 | mddev->level = pers->level; |
| 5557 | mddev->new_level = pers->level; |
| 5558 | } |
| 5559 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
| 5560 | |
| 5561 | if (mddev->reshape_position != MaxSector && |
| 5562 | pers->start_reshape == NULL) { |
| 5563 | /* This personality cannot handle reshaping... */ |
| 5564 | module_put(pers->owner); |
| 5565 | err = -EINVAL; |
| 5566 | goto abort; |
| 5567 | } |
| 5568 | |
| 5569 | if (pers->sync_request) { |
| 5570 | /* Warn if this is a potentially silly |
| 5571 | * configuration. |
| 5572 | */ |
| 5573 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| 5574 | struct md_rdev *rdev2; |
| 5575 | int warned = 0; |
| 5576 | |
| 5577 | rdev_for_each(rdev, mddev) |
| 5578 | rdev_for_each(rdev2, mddev) { |
| 5579 | if (rdev < rdev2 && |
| 5580 | rdev->bdev->bd_contains == |
| 5581 | rdev2->bdev->bd_contains) { |
| 5582 | pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n", |
| 5583 | mdname(mddev), |
| 5584 | bdevname(rdev->bdev,b), |
| 5585 | bdevname(rdev2->bdev,b2)); |
| 5586 | warned = 1; |
| 5587 | } |
| 5588 | } |
| 5589 | |
| 5590 | if (warned) |
| 5591 | pr_warn("True protection against single-disk failure might be compromised.\n"); |
| 5592 | } |
| 5593 | |
| 5594 | mddev->recovery = 0; |
| 5595 | /* may be over-ridden by personality */ |
| 5596 | mddev->resync_max_sectors = mddev->dev_sectors; |
| 5597 | |
| 5598 | mddev->ok_start_degraded = start_dirty_degraded; |
| 5599 | |
| 5600 | if (start_readonly && mddev->ro == 0) |
| 5601 | mddev->ro = 2; /* read-only, but switch on first write */ |
| 5602 | |
| 5603 | err = pers->run(mddev); |
| 5604 | if (err) |
| 5605 | pr_warn("md: pers->run() failed ...\n"); |
| 5606 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
| 5607 | WARN_ONCE(!mddev->external_size, |
| 5608 | "%s: default size too small, but 'external_size' not in effect?\n", |
| 5609 | __func__); |
| 5610 | pr_warn("md: invalid array_size %llu > default size %llu\n", |
| 5611 | (unsigned long long)mddev->array_sectors / 2, |
| 5612 | (unsigned long long)pers->size(mddev, 0, 0) / 2); |
| 5613 | err = -EINVAL; |
| 5614 | } |
| 5615 | if (err == 0 && pers->sync_request && |
| 5616 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
| 5617 | struct bitmap *bitmap; |
| 5618 | |
| 5619 | bitmap = bitmap_create(mddev, -1); |
| 5620 | if (IS_ERR(bitmap)) { |
| 5621 | err = PTR_ERR(bitmap); |
| 5622 | pr_warn("%s: failed to create bitmap (%d)\n", |
| 5623 | mdname(mddev), err); |
| 5624 | } else |
| 5625 | mddev->bitmap = bitmap; |
| 5626 | |
| 5627 | } |
| 5628 | if (err) { |
| 5629 | mddev_detach(mddev); |
| 5630 | if (mddev->private) |
| 5631 | pers->free(mddev, mddev->private); |
| 5632 | mddev->private = NULL; |
| 5633 | module_put(pers->owner); |
| 5634 | bitmap_destroy(mddev); |
| 5635 | goto abort; |
| 5636 | } |
| 5637 | if (mddev->queue) { |
| 5638 | bool nonrot = true; |
| 5639 | |
| 5640 | rdev_for_each(rdev, mddev) { |
| 5641 | if (rdev->raid_disk >= 0 && |
| 5642 | !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { |
| 5643 | nonrot = false; |
| 5644 | break; |
| 5645 | } |
| 5646 | } |
| 5647 | if (mddev->degraded) |
| 5648 | nonrot = false; |
| 5649 | if (nonrot) |
| 5650 | blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue); |
| 5651 | else |
| 5652 | blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue); |
| 5653 | mddev->queue->backing_dev_info->congested_data = mddev; |
| 5654 | mddev->queue->backing_dev_info->congested_fn = md_congested; |
| 5655 | } |
| 5656 | if (pers->sync_request) { |
| 5657 | if (mddev->kobj.sd && |
| 5658 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) |
| 5659 | pr_warn("md: cannot register extra attributes for %s\n", |
| 5660 | mdname(mddev)); |
| 5661 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
| 5662 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
| 5663 | mddev->ro = 0; |
| 5664 | |
| 5665 | atomic_set(&mddev->max_corr_read_errors, |
| 5666 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); |
| 5667 | mddev->safemode = 0; |
| 5668 | if (mddev_is_clustered(mddev)) |
| 5669 | mddev->safemode_delay = 0; |
| 5670 | else |
| 5671 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
| 5672 | mddev->in_sync = 1; |
| 5673 | smp_wmb(); |
| 5674 | spin_lock(&mddev->lock); |
| 5675 | mddev->pers = pers; |
| 5676 | spin_unlock(&mddev->lock); |
| 5677 | rdev_for_each(rdev, mddev) |
| 5678 | if (rdev->raid_disk >= 0) |
| 5679 | if (sysfs_link_rdev(mddev, rdev)) |
| 5680 | /* failure here is OK */; |
| 5681 | |
| 5682 | if (mddev->degraded && !mddev->ro) |
| 5683 | /* This ensures that recovering status is reported immediately |
| 5684 | * via sysfs - until a lack of spares is confirmed. |
| 5685 | */ |
| 5686 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 5687 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 5688 | |
| 5689 | if (mddev->sb_flags) |
| 5690 | md_update_sb(mddev, 0); |
| 5691 | |
| 5692 | md_new_event(mddev); |
| 5693 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 5694 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
| 5695 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| 5696 | return 0; |
| 5697 | |
| 5698 | abort: |
| 5699 | if (mddev->flush_bio_pool) { |
| 5700 | mempool_destroy(mddev->flush_bio_pool); |
| 5701 | mddev->flush_bio_pool = NULL; |
| 5702 | } |
| 5703 | if (mddev->flush_pool){ |
| 5704 | mempool_destroy(mddev->flush_pool); |
| 5705 | mddev->flush_pool = NULL; |
| 5706 | } |
| 5707 | |
| 5708 | return err; |
| 5709 | } |
| 5710 | EXPORT_SYMBOL_GPL(md_run); |
| 5711 | |
| 5712 | static int do_md_run(struct mddev *mddev) |
| 5713 | { |
| 5714 | int err; |
| 5715 | |
| 5716 | err = md_run(mddev); |
| 5717 | if (err) |
| 5718 | goto out; |
| 5719 | err = bitmap_load(mddev); |
| 5720 | if (err) { |
| 5721 | bitmap_destroy(mddev); |
| 5722 | goto out; |
| 5723 | } |
| 5724 | |
| 5725 | if (mddev_is_clustered(mddev)) |
| 5726 | md_allow_write(mddev); |
| 5727 | |
| 5728 | /* run start up tasks that require md_thread */ |
| 5729 | md_start(mddev); |
| 5730 | |
| 5731 | md_wakeup_thread(mddev->thread); |
| 5732 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ |
| 5733 | |
| 5734 | set_capacity(mddev->gendisk, mddev->array_sectors); |
| 5735 | revalidate_disk(mddev->gendisk); |
| 5736 | mddev->changed = 1; |
| 5737 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
| 5738 | out: |
| 5739 | return err; |
| 5740 | } |
| 5741 | |
| 5742 | int md_start(struct mddev *mddev) |
| 5743 | { |
| 5744 | int ret = 0; |
| 5745 | |
| 5746 | if (mddev->pers->start) { |
| 5747 | set_bit(MD_RECOVERY_WAIT, &mddev->recovery); |
| 5748 | md_wakeup_thread(mddev->thread); |
| 5749 | ret = mddev->pers->start(mddev); |
| 5750 | clear_bit(MD_RECOVERY_WAIT, &mddev->recovery); |
| 5751 | md_wakeup_thread(mddev->sync_thread); |
| 5752 | } |
| 5753 | return ret; |
| 5754 | } |
| 5755 | EXPORT_SYMBOL_GPL(md_start); |
| 5756 | |
| 5757 | static int restart_array(struct mddev *mddev) |
| 5758 | { |
| 5759 | struct gendisk *disk = mddev->gendisk; |
| 5760 | struct md_rdev *rdev; |
| 5761 | bool has_journal = false; |
| 5762 | bool has_readonly = false; |
| 5763 | |
| 5764 | /* Complain if it has no devices */ |
| 5765 | if (list_empty(&mddev->disks)) |
| 5766 | return -ENXIO; |
| 5767 | if (!mddev->pers) |
| 5768 | return -EINVAL; |
| 5769 | if (!mddev->ro) |
| 5770 | return -EBUSY; |
| 5771 | |
| 5772 | rcu_read_lock(); |
| 5773 | rdev_for_each_rcu(rdev, mddev) { |
| 5774 | if (test_bit(Journal, &rdev->flags) && |
| 5775 | !test_bit(Faulty, &rdev->flags)) |
| 5776 | has_journal = true; |
| 5777 | if (bdev_read_only(rdev->bdev)) |
| 5778 | has_readonly = true; |
| 5779 | } |
| 5780 | rcu_read_unlock(); |
| 5781 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal) |
| 5782 | /* Don't restart rw with journal missing/faulty */ |
| 5783 | return -EINVAL; |
| 5784 | if (has_readonly) |
| 5785 | return -EROFS; |
| 5786 | |
| 5787 | mddev->safemode = 0; |
| 5788 | mddev->ro = 0; |
| 5789 | set_disk_ro(disk, 0); |
| 5790 | pr_debug("md: %s switched to read-write mode.\n", mdname(mddev)); |
| 5791 | /* Kick recovery or resync if necessary */ |
| 5792 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 5793 | md_wakeup_thread(mddev->thread); |
| 5794 | md_wakeup_thread(mddev->sync_thread); |
| 5795 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 5796 | return 0; |
| 5797 | } |
| 5798 | |
| 5799 | static void md_clean(struct mddev *mddev) |
| 5800 | { |
| 5801 | mddev->array_sectors = 0; |
| 5802 | mddev->external_size = 0; |
| 5803 | mddev->dev_sectors = 0; |
| 5804 | mddev->raid_disks = 0; |
| 5805 | mddev->recovery_cp = 0; |
| 5806 | mddev->resync_min = 0; |
| 5807 | mddev->resync_max = MaxSector; |
| 5808 | mddev->reshape_position = MaxSector; |
| 5809 | mddev->external = 0; |
| 5810 | mddev->persistent = 0; |
| 5811 | mddev->level = LEVEL_NONE; |
| 5812 | mddev->clevel[0] = 0; |
| 5813 | mddev->flags = 0; |
| 5814 | mddev->sb_flags = 0; |
| 5815 | mddev->ro = 0; |
| 5816 | mddev->metadata_type[0] = 0; |
| 5817 | mddev->chunk_sectors = 0; |
| 5818 | mddev->ctime = mddev->utime = 0; |
| 5819 | mddev->layout = 0; |
| 5820 | mddev->max_disks = 0; |
| 5821 | mddev->events = 0; |
| 5822 | mddev->can_decrease_events = 0; |
| 5823 | mddev->delta_disks = 0; |
| 5824 | mddev->reshape_backwards = 0; |
| 5825 | mddev->new_level = LEVEL_NONE; |
| 5826 | mddev->new_layout = 0; |
| 5827 | mddev->new_chunk_sectors = 0; |
| 5828 | mddev->curr_resync = 0; |
| 5829 | atomic64_set(&mddev->resync_mismatches, 0); |
| 5830 | mddev->suspend_lo = mddev->suspend_hi = 0; |
| 5831 | mddev->sync_speed_min = mddev->sync_speed_max = 0; |
| 5832 | mddev->recovery = 0; |
| 5833 | mddev->in_sync = 0; |
| 5834 | mddev->changed = 0; |
| 5835 | mddev->degraded = 0; |
| 5836 | mddev->safemode = 0; |
| 5837 | mddev->private = NULL; |
| 5838 | mddev->cluster_info = NULL; |
| 5839 | mddev->bitmap_info.offset = 0; |
| 5840 | mddev->bitmap_info.default_offset = 0; |
| 5841 | mddev->bitmap_info.default_space = 0; |
| 5842 | mddev->bitmap_info.chunksize = 0; |
| 5843 | mddev->bitmap_info.daemon_sleep = 0; |
| 5844 | mddev->bitmap_info.max_write_behind = 0; |
| 5845 | mddev->bitmap_info.nodes = 0; |
| 5846 | } |
| 5847 | |
| 5848 | static void __md_stop_writes(struct mddev *mddev) |
| 5849 | { |
| 5850 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 5851 | flush_workqueue(md_misc_wq); |
| 5852 | if (mddev->sync_thread) { |
| 5853 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 5854 | md_reap_sync_thread(mddev); |
| 5855 | } |
| 5856 | |
| 5857 | del_timer_sync(&mddev->safemode_timer); |
| 5858 | |
| 5859 | if (mddev->pers && mddev->pers->quiesce) { |
| 5860 | mddev->pers->quiesce(mddev, 1); |
| 5861 | mddev->pers->quiesce(mddev, 0); |
| 5862 | } |
| 5863 | bitmap_flush(mddev); |
| 5864 | |
| 5865 | if (mddev->ro == 0 && |
| 5866 | ((!mddev->in_sync && !mddev_is_clustered(mddev)) || |
| 5867 | mddev->sb_flags)) { |
| 5868 | /* mark array as shutdown cleanly */ |
| 5869 | if (!mddev_is_clustered(mddev)) |
| 5870 | mddev->in_sync = 1; |
| 5871 | md_update_sb(mddev, 1); |
| 5872 | } |
| 5873 | } |
| 5874 | |
| 5875 | void md_stop_writes(struct mddev *mddev) |
| 5876 | { |
| 5877 | mddev_lock_nointr(mddev); |
| 5878 | __md_stop_writes(mddev); |
| 5879 | mddev_unlock(mddev); |
| 5880 | } |
| 5881 | EXPORT_SYMBOL_GPL(md_stop_writes); |
| 5882 | |
| 5883 | static void mddev_detach(struct mddev *mddev) |
| 5884 | { |
| 5885 | bitmap_wait_behind_writes(mddev); |
| 5886 | if (mddev->pers && mddev->pers->quiesce) { |
| 5887 | mddev->pers->quiesce(mddev, 1); |
| 5888 | mddev->pers->quiesce(mddev, 0); |
| 5889 | } |
| 5890 | md_unregister_thread(&mddev->thread); |
| 5891 | if (mddev->queue) |
| 5892 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ |
| 5893 | } |
| 5894 | |
| 5895 | static void __md_stop(struct mddev *mddev) |
| 5896 | { |
| 5897 | struct md_personality *pers = mddev->pers; |
| 5898 | bitmap_destroy(mddev); |
| 5899 | mddev_detach(mddev); |
| 5900 | /* Ensure ->event_work is done */ |
| 5901 | flush_workqueue(md_misc_wq); |
| 5902 | spin_lock(&mddev->lock); |
| 5903 | mddev->pers = NULL; |
| 5904 | spin_unlock(&mddev->lock); |
| 5905 | pers->free(mddev, mddev->private); |
| 5906 | mddev->private = NULL; |
| 5907 | if (pers->sync_request && mddev->to_remove == NULL) |
| 5908 | mddev->to_remove = &md_redundancy_group; |
| 5909 | module_put(pers->owner); |
| 5910 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 5911 | } |
| 5912 | |
| 5913 | void md_stop(struct mddev *mddev) |
| 5914 | { |
| 5915 | /* stop the array and free an attached data structures. |
| 5916 | * This is called from dm-raid |
| 5917 | */ |
| 5918 | __md_stop(mddev); |
| 5919 | if (mddev->flush_bio_pool) { |
| 5920 | mempool_destroy(mddev->flush_bio_pool); |
| 5921 | mddev->flush_bio_pool = NULL; |
| 5922 | } |
| 5923 | if (mddev->flush_pool) { |
| 5924 | mempool_destroy(mddev->flush_pool); |
| 5925 | mddev->flush_pool = NULL; |
| 5926 | } |
| 5927 | bioset_exit(&mddev->bio_set); |
| 5928 | bioset_exit(&mddev->sync_set); |
| 5929 | } |
| 5930 | |
| 5931 | EXPORT_SYMBOL_GPL(md_stop); |
| 5932 | |
| 5933 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
| 5934 | { |
| 5935 | int err = 0; |
| 5936 | int did_freeze = 0; |
| 5937 | |
| 5938 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { |
| 5939 | did_freeze = 1; |
| 5940 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 5941 | md_wakeup_thread(mddev->thread); |
| 5942 | } |
| 5943 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 5944 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 5945 | if (mddev->sync_thread) |
| 5946 | /* Thread might be blocked waiting for metadata update |
| 5947 | * which will now never happen */ |
| 5948 | wake_up_process(mddev->sync_thread->tsk); |
| 5949 | |
| 5950 | if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
| 5951 | return -EBUSY; |
| 5952 | mddev_unlock(mddev); |
| 5953 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
| 5954 | &mddev->recovery)); |
| 5955 | wait_event(mddev->sb_wait, |
| 5956 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); |
| 5957 | mddev_lock_nointr(mddev); |
| 5958 | |
| 5959 | mutex_lock(&mddev->open_mutex); |
| 5960 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
| 5961 | mddev->sync_thread || |
| 5962 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { |
| 5963 | pr_warn("md: %s still in use.\n",mdname(mddev)); |
| 5964 | if (did_freeze) { |
| 5965 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 5966 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 5967 | md_wakeup_thread(mddev->thread); |
| 5968 | } |
| 5969 | err = -EBUSY; |
| 5970 | goto out; |
| 5971 | } |
| 5972 | if (mddev->pers) { |
| 5973 | __md_stop_writes(mddev); |
| 5974 | |
| 5975 | err = -ENXIO; |
| 5976 | if (mddev->ro==1) |
| 5977 | goto out; |
| 5978 | mddev->ro = 1; |
| 5979 | set_disk_ro(mddev->gendisk, 1); |
| 5980 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 5981 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 5982 | md_wakeup_thread(mddev->thread); |
| 5983 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 5984 | err = 0; |
| 5985 | } |
| 5986 | out: |
| 5987 | mutex_unlock(&mddev->open_mutex); |
| 5988 | return err; |
| 5989 | } |
| 5990 | |
| 5991 | /* mode: |
| 5992 | * 0 - completely stop and dis-assemble array |
| 5993 | * 2 - stop but do not disassemble array |
| 5994 | */ |
| 5995 | static int do_md_stop(struct mddev *mddev, int mode, |
| 5996 | struct block_device *bdev) |
| 5997 | { |
| 5998 | struct gendisk *disk = mddev->gendisk; |
| 5999 | struct md_rdev *rdev; |
| 6000 | int did_freeze = 0; |
| 6001 | |
| 6002 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { |
| 6003 | did_freeze = 1; |
| 6004 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 6005 | md_wakeup_thread(mddev->thread); |
| 6006 | } |
| 6007 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 6008 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 6009 | if (mddev->sync_thread) |
| 6010 | /* Thread might be blocked waiting for metadata update |
| 6011 | * which will now never happen */ |
| 6012 | wake_up_process(mddev->sync_thread->tsk); |
| 6013 | |
| 6014 | mddev_unlock(mddev); |
| 6015 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
| 6016 | !test_bit(MD_RECOVERY_RUNNING, |
| 6017 | &mddev->recovery))); |
| 6018 | mddev_lock_nointr(mddev); |
| 6019 | |
| 6020 | mutex_lock(&mddev->open_mutex); |
| 6021 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
| 6022 | mddev->sysfs_active || |
| 6023 | mddev->sync_thread || |
| 6024 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { |
| 6025 | pr_warn("md: %s still in use.\n",mdname(mddev)); |
| 6026 | mutex_unlock(&mddev->open_mutex); |
| 6027 | if (did_freeze) { |
| 6028 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 6029 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 6030 | md_wakeup_thread(mddev->thread); |
| 6031 | } |
| 6032 | return -EBUSY; |
| 6033 | } |
| 6034 | if (mddev->pers) { |
| 6035 | if (mddev->ro) |
| 6036 | set_disk_ro(disk, 0); |
| 6037 | |
| 6038 | __md_stop_writes(mddev); |
| 6039 | __md_stop(mddev); |
| 6040 | mddev->queue->backing_dev_info->congested_fn = NULL; |
| 6041 | |
| 6042 | /* tell userspace to handle 'inactive' */ |
| 6043 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 6044 | |
| 6045 | rdev_for_each(rdev, mddev) |
| 6046 | if (rdev->raid_disk >= 0) |
| 6047 | sysfs_unlink_rdev(mddev, rdev); |
| 6048 | |
| 6049 | set_capacity(disk, 0); |
| 6050 | mutex_unlock(&mddev->open_mutex); |
| 6051 | mddev->changed = 1; |
| 6052 | revalidate_disk(disk); |
| 6053 | |
| 6054 | if (mddev->ro) |
| 6055 | mddev->ro = 0; |
| 6056 | } else |
| 6057 | mutex_unlock(&mddev->open_mutex); |
| 6058 | /* |
| 6059 | * Free resources if final stop |
| 6060 | */ |
| 6061 | if (mode == 0) { |
| 6062 | pr_info("md: %s stopped.\n", mdname(mddev)); |
| 6063 | |
| 6064 | if (mddev->bitmap_info.file) { |
| 6065 | struct file *f = mddev->bitmap_info.file; |
| 6066 | spin_lock(&mddev->lock); |
| 6067 | mddev->bitmap_info.file = NULL; |
| 6068 | spin_unlock(&mddev->lock); |
| 6069 | fput(f); |
| 6070 | } |
| 6071 | mddev->bitmap_info.offset = 0; |
| 6072 | |
| 6073 | export_array(mddev); |
| 6074 | |
| 6075 | md_clean(mddev); |
| 6076 | if (mddev->hold_active == UNTIL_STOP) |
| 6077 | mddev->hold_active = 0; |
| 6078 | } |
| 6079 | md_new_event(mddev); |
| 6080 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 6081 | return 0; |
| 6082 | } |
| 6083 | |
| 6084 | #ifndef MODULE |
| 6085 | static void autorun_array(struct mddev *mddev) |
| 6086 | { |
| 6087 | struct md_rdev *rdev; |
| 6088 | int err; |
| 6089 | |
| 6090 | if (list_empty(&mddev->disks)) |
| 6091 | return; |
| 6092 | |
| 6093 | pr_info("md: running: "); |
| 6094 | |
| 6095 | rdev_for_each(rdev, mddev) { |
| 6096 | char b[BDEVNAME_SIZE]; |
| 6097 | pr_cont("<%s>", bdevname(rdev->bdev,b)); |
| 6098 | } |
| 6099 | pr_cont("\n"); |
| 6100 | |
| 6101 | err = do_md_run(mddev); |
| 6102 | if (err) { |
| 6103 | pr_warn("md: do_md_run() returned %d\n", err); |
| 6104 | do_md_stop(mddev, 0, NULL); |
| 6105 | } |
| 6106 | } |
| 6107 | |
| 6108 | /* |
| 6109 | * lets try to run arrays based on all disks that have arrived |
| 6110 | * until now. (those are in pending_raid_disks) |
| 6111 | * |
| 6112 | * the method: pick the first pending disk, collect all disks with |
| 6113 | * the same UUID, remove all from the pending list and put them into |
| 6114 | * the 'same_array' list. Then order this list based on superblock |
| 6115 | * update time (freshest comes first), kick out 'old' disks and |
| 6116 | * compare superblocks. If everything's fine then run it. |
| 6117 | * |
| 6118 | * If "unit" is allocated, then bump its reference count |
| 6119 | */ |
| 6120 | static void autorun_devices(int part) |
| 6121 | { |
| 6122 | struct md_rdev *rdev0, *rdev, *tmp; |
| 6123 | struct mddev *mddev; |
| 6124 | char b[BDEVNAME_SIZE]; |
| 6125 | |
| 6126 | pr_info("md: autorun ...\n"); |
| 6127 | while (!list_empty(&pending_raid_disks)) { |
| 6128 | int unit; |
| 6129 | dev_t dev; |
| 6130 | LIST_HEAD(candidates); |
| 6131 | rdev0 = list_entry(pending_raid_disks.next, |
| 6132 | struct md_rdev, same_set); |
| 6133 | |
| 6134 | pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b)); |
| 6135 | INIT_LIST_HEAD(&candidates); |
| 6136 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
| 6137 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
| 6138 | pr_debug("md: adding %s ...\n", |
| 6139 | bdevname(rdev->bdev,b)); |
| 6140 | list_move(&rdev->same_set, &candidates); |
| 6141 | } |
| 6142 | /* |
| 6143 | * now we have a set of devices, with all of them having |
| 6144 | * mostly sane superblocks. It's time to allocate the |
| 6145 | * mddev. |
| 6146 | */ |
| 6147 | if (part) { |
| 6148 | dev = MKDEV(mdp_major, |
| 6149 | rdev0->preferred_minor << MdpMinorShift); |
| 6150 | unit = MINOR(dev) >> MdpMinorShift; |
| 6151 | } else { |
| 6152 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); |
| 6153 | unit = MINOR(dev); |
| 6154 | } |
| 6155 | if (rdev0->preferred_minor != unit) { |
| 6156 | pr_warn("md: unit number in %s is bad: %d\n", |
| 6157 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); |
| 6158 | break; |
| 6159 | } |
| 6160 | |
| 6161 | md_probe(dev, NULL, NULL); |
| 6162 | mddev = mddev_find(dev); |
| 6163 | if (!mddev || !mddev->gendisk) { |
| 6164 | if (mddev) |
| 6165 | mddev_put(mddev); |
| 6166 | break; |
| 6167 | } |
| 6168 | if (mddev_lock(mddev)) |
| 6169 | pr_warn("md: %s locked, cannot run\n", mdname(mddev)); |
| 6170 | else if (mddev->raid_disks || mddev->major_version |
| 6171 | || !list_empty(&mddev->disks)) { |
| 6172 | pr_warn("md: %s already running, cannot run %s\n", |
| 6173 | mdname(mddev), bdevname(rdev0->bdev,b)); |
| 6174 | mddev_unlock(mddev); |
| 6175 | } else { |
| 6176 | pr_debug("md: created %s\n", mdname(mddev)); |
| 6177 | mddev->persistent = 1; |
| 6178 | rdev_for_each_list(rdev, tmp, &candidates) { |
| 6179 | list_del_init(&rdev->same_set); |
| 6180 | if (bind_rdev_to_array(rdev, mddev)) |
| 6181 | export_rdev(rdev); |
| 6182 | } |
| 6183 | autorun_array(mddev); |
| 6184 | mddev_unlock(mddev); |
| 6185 | } |
| 6186 | /* on success, candidates will be empty, on error |
| 6187 | * it won't... |
| 6188 | */ |
| 6189 | rdev_for_each_list(rdev, tmp, &candidates) { |
| 6190 | list_del_init(&rdev->same_set); |
| 6191 | export_rdev(rdev); |
| 6192 | } |
| 6193 | mddev_put(mddev); |
| 6194 | } |
| 6195 | pr_info("md: ... autorun DONE.\n"); |
| 6196 | } |
| 6197 | #endif /* !MODULE */ |
| 6198 | |
| 6199 | static int get_version(void __user *arg) |
| 6200 | { |
| 6201 | mdu_version_t ver; |
| 6202 | |
| 6203 | ver.major = MD_MAJOR_VERSION; |
| 6204 | ver.minor = MD_MINOR_VERSION; |
| 6205 | ver.patchlevel = MD_PATCHLEVEL_VERSION; |
| 6206 | |
| 6207 | if (copy_to_user(arg, &ver, sizeof(ver))) |
| 6208 | return -EFAULT; |
| 6209 | |
| 6210 | return 0; |
| 6211 | } |
| 6212 | |
| 6213 | static int get_array_info(struct mddev *mddev, void __user *arg) |
| 6214 | { |
| 6215 | mdu_array_info_t info; |
| 6216 | int nr,working,insync,failed,spare; |
| 6217 | struct md_rdev *rdev; |
| 6218 | |
| 6219 | nr = working = insync = failed = spare = 0; |
| 6220 | rcu_read_lock(); |
| 6221 | rdev_for_each_rcu(rdev, mddev) { |
| 6222 | nr++; |
| 6223 | if (test_bit(Faulty, &rdev->flags)) |
| 6224 | failed++; |
| 6225 | else { |
| 6226 | working++; |
| 6227 | if (test_bit(In_sync, &rdev->flags)) |
| 6228 | insync++; |
| 6229 | else if (test_bit(Journal, &rdev->flags)) |
| 6230 | /* TODO: add journal count to md_u.h */ |
| 6231 | ; |
| 6232 | else |
| 6233 | spare++; |
| 6234 | } |
| 6235 | } |
| 6236 | rcu_read_unlock(); |
| 6237 | |
| 6238 | info.major_version = mddev->major_version; |
| 6239 | info.minor_version = mddev->minor_version; |
| 6240 | info.patch_version = MD_PATCHLEVEL_VERSION; |
| 6241 | info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); |
| 6242 | info.level = mddev->level; |
| 6243 | info.size = mddev->dev_sectors / 2; |
| 6244 | if (info.size != mddev->dev_sectors / 2) /* overflow */ |
| 6245 | info.size = -1; |
| 6246 | info.nr_disks = nr; |
| 6247 | info.raid_disks = mddev->raid_disks; |
| 6248 | info.md_minor = mddev->md_minor; |
| 6249 | info.not_persistent= !mddev->persistent; |
| 6250 | |
| 6251 | info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); |
| 6252 | info.state = 0; |
| 6253 | if (mddev->in_sync) |
| 6254 | info.state = (1<<MD_SB_CLEAN); |
| 6255 | if (mddev->bitmap && mddev->bitmap_info.offset) |
| 6256 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
| 6257 | if (mddev_is_clustered(mddev)) |
| 6258 | info.state |= (1<<MD_SB_CLUSTERED); |
| 6259 | info.active_disks = insync; |
| 6260 | info.working_disks = working; |
| 6261 | info.failed_disks = failed; |
| 6262 | info.spare_disks = spare; |
| 6263 | |
| 6264 | info.layout = mddev->layout; |
| 6265 | info.chunk_size = mddev->chunk_sectors << 9; |
| 6266 | |
| 6267 | if (copy_to_user(arg, &info, sizeof(info))) |
| 6268 | return -EFAULT; |
| 6269 | |
| 6270 | return 0; |
| 6271 | } |
| 6272 | |
| 6273 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
| 6274 | { |
| 6275 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ |
| 6276 | char *ptr; |
| 6277 | int err; |
| 6278 | |
| 6279 | file = kzalloc(sizeof(*file), GFP_NOIO); |
| 6280 | if (!file) |
| 6281 | return -ENOMEM; |
| 6282 | |
| 6283 | err = 0; |
| 6284 | spin_lock(&mddev->lock); |
| 6285 | /* bitmap enabled */ |
| 6286 | if (mddev->bitmap_info.file) { |
| 6287 | ptr = file_path(mddev->bitmap_info.file, file->pathname, |
| 6288 | sizeof(file->pathname)); |
| 6289 | if (IS_ERR(ptr)) |
| 6290 | err = PTR_ERR(ptr); |
| 6291 | else |
| 6292 | memmove(file->pathname, ptr, |
| 6293 | sizeof(file->pathname)-(ptr-file->pathname)); |
| 6294 | } |
| 6295 | spin_unlock(&mddev->lock); |
| 6296 | |
| 6297 | if (err == 0 && |
| 6298 | copy_to_user(arg, file, sizeof(*file))) |
| 6299 | err = -EFAULT; |
| 6300 | |
| 6301 | kfree(file); |
| 6302 | return err; |
| 6303 | } |
| 6304 | |
| 6305 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
| 6306 | { |
| 6307 | mdu_disk_info_t info; |
| 6308 | struct md_rdev *rdev; |
| 6309 | |
| 6310 | if (copy_from_user(&info, arg, sizeof(info))) |
| 6311 | return -EFAULT; |
| 6312 | |
| 6313 | rcu_read_lock(); |
| 6314 | rdev = md_find_rdev_nr_rcu(mddev, info.number); |
| 6315 | if (rdev) { |
| 6316 | info.major = MAJOR(rdev->bdev->bd_dev); |
| 6317 | info.minor = MINOR(rdev->bdev->bd_dev); |
| 6318 | info.raid_disk = rdev->raid_disk; |
| 6319 | info.state = 0; |
| 6320 | if (test_bit(Faulty, &rdev->flags)) |
| 6321 | info.state |= (1<<MD_DISK_FAULTY); |
| 6322 | else if (test_bit(In_sync, &rdev->flags)) { |
| 6323 | info.state |= (1<<MD_DISK_ACTIVE); |
| 6324 | info.state |= (1<<MD_DISK_SYNC); |
| 6325 | } |
| 6326 | if (test_bit(Journal, &rdev->flags)) |
| 6327 | info.state |= (1<<MD_DISK_JOURNAL); |
| 6328 | if (test_bit(WriteMostly, &rdev->flags)) |
| 6329 | info.state |= (1<<MD_DISK_WRITEMOSTLY); |
| 6330 | if (test_bit(FailFast, &rdev->flags)) |
| 6331 | info.state |= (1<<MD_DISK_FAILFAST); |
| 6332 | } else { |
| 6333 | info.major = info.minor = 0; |
| 6334 | info.raid_disk = -1; |
| 6335 | info.state = (1<<MD_DISK_REMOVED); |
| 6336 | } |
| 6337 | rcu_read_unlock(); |
| 6338 | |
| 6339 | if (copy_to_user(arg, &info, sizeof(info))) |
| 6340 | return -EFAULT; |
| 6341 | |
| 6342 | return 0; |
| 6343 | } |
| 6344 | |
| 6345 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
| 6346 | { |
| 6347 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| 6348 | struct md_rdev *rdev; |
| 6349 | dev_t dev = MKDEV(info->major,info->minor); |
| 6350 | |
| 6351 | if (mddev_is_clustered(mddev) && |
| 6352 | !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { |
| 6353 | pr_warn("%s: Cannot add to clustered mddev.\n", |
| 6354 | mdname(mddev)); |
| 6355 | return -EINVAL; |
| 6356 | } |
| 6357 | |
| 6358 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) |
| 6359 | return -EOVERFLOW; |
| 6360 | |
| 6361 | if (!mddev->raid_disks) { |
| 6362 | int err; |
| 6363 | /* expecting a device which has a superblock */ |
| 6364 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); |
| 6365 | if (IS_ERR(rdev)) { |
| 6366 | pr_warn("md: md_import_device returned %ld\n", |
| 6367 | PTR_ERR(rdev)); |
| 6368 | return PTR_ERR(rdev); |
| 6369 | } |
| 6370 | if (!list_empty(&mddev->disks)) { |
| 6371 | struct md_rdev *rdev0 |
| 6372 | = list_entry(mddev->disks.next, |
| 6373 | struct md_rdev, same_set); |
| 6374 | err = super_types[mddev->major_version] |
| 6375 | .load_super(rdev, rdev0, mddev->minor_version); |
| 6376 | if (err < 0) { |
| 6377 | pr_warn("md: %s has different UUID to %s\n", |
| 6378 | bdevname(rdev->bdev,b), |
| 6379 | bdevname(rdev0->bdev,b2)); |
| 6380 | export_rdev(rdev); |
| 6381 | return -EINVAL; |
| 6382 | } |
| 6383 | } |
| 6384 | err = bind_rdev_to_array(rdev, mddev); |
| 6385 | if (err) |
| 6386 | export_rdev(rdev); |
| 6387 | return err; |
| 6388 | } |
| 6389 | |
| 6390 | /* |
| 6391 | * add_new_disk can be used once the array is assembled |
| 6392 | * to add "hot spares". They must already have a superblock |
| 6393 | * written |
| 6394 | */ |
| 6395 | if (mddev->pers) { |
| 6396 | int err; |
| 6397 | if (!mddev->pers->hot_add_disk) { |
| 6398 | pr_warn("%s: personality does not support diskops!\n", |
| 6399 | mdname(mddev)); |
| 6400 | return -EINVAL; |
| 6401 | } |
| 6402 | if (mddev->persistent) |
| 6403 | rdev = md_import_device(dev, mddev->major_version, |
| 6404 | mddev->minor_version); |
| 6405 | else |
| 6406 | rdev = md_import_device(dev, -1, -1); |
| 6407 | if (IS_ERR(rdev)) { |
| 6408 | pr_warn("md: md_import_device returned %ld\n", |
| 6409 | PTR_ERR(rdev)); |
| 6410 | return PTR_ERR(rdev); |
| 6411 | } |
| 6412 | /* set saved_raid_disk if appropriate */ |
| 6413 | if (!mddev->persistent) { |
| 6414 | if (info->state & (1<<MD_DISK_SYNC) && |
| 6415 | info->raid_disk < mddev->raid_disks) { |
| 6416 | rdev->raid_disk = info->raid_disk; |
| 6417 | set_bit(In_sync, &rdev->flags); |
| 6418 | clear_bit(Bitmap_sync, &rdev->flags); |
| 6419 | } else |
| 6420 | rdev->raid_disk = -1; |
| 6421 | rdev->saved_raid_disk = rdev->raid_disk; |
| 6422 | } else |
| 6423 | super_types[mddev->major_version]. |
| 6424 | validate_super(mddev, rdev); |
| 6425 | if ((info->state & (1<<MD_DISK_SYNC)) && |
| 6426 | rdev->raid_disk != info->raid_disk) { |
| 6427 | /* This was a hot-add request, but events doesn't |
| 6428 | * match, so reject it. |
| 6429 | */ |
| 6430 | export_rdev(rdev); |
| 6431 | return -EINVAL; |
| 6432 | } |
| 6433 | |
| 6434 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
| 6435 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
| 6436 | set_bit(WriteMostly, &rdev->flags); |
| 6437 | else |
| 6438 | clear_bit(WriteMostly, &rdev->flags); |
| 6439 | if (info->state & (1<<MD_DISK_FAILFAST)) |
| 6440 | set_bit(FailFast, &rdev->flags); |
| 6441 | else |
| 6442 | clear_bit(FailFast, &rdev->flags); |
| 6443 | |
| 6444 | if (info->state & (1<<MD_DISK_JOURNAL)) { |
| 6445 | struct md_rdev *rdev2; |
| 6446 | bool has_journal = false; |
| 6447 | |
| 6448 | /* make sure no existing journal disk */ |
| 6449 | rdev_for_each(rdev2, mddev) { |
| 6450 | if (test_bit(Journal, &rdev2->flags)) { |
| 6451 | has_journal = true; |
| 6452 | break; |
| 6453 | } |
| 6454 | } |
| 6455 | if (has_journal || mddev->bitmap) { |
| 6456 | export_rdev(rdev); |
| 6457 | return -EBUSY; |
| 6458 | } |
| 6459 | set_bit(Journal, &rdev->flags); |
| 6460 | } |
| 6461 | /* |
| 6462 | * check whether the device shows up in other nodes |
| 6463 | */ |
| 6464 | if (mddev_is_clustered(mddev)) { |
| 6465 | if (info->state & (1 << MD_DISK_CANDIDATE)) |
| 6466 | set_bit(Candidate, &rdev->flags); |
| 6467 | else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { |
| 6468 | /* --add initiated by this node */ |
| 6469 | err = md_cluster_ops->add_new_disk(mddev, rdev); |
| 6470 | if (err) { |
| 6471 | export_rdev(rdev); |
| 6472 | return err; |
| 6473 | } |
| 6474 | } |
| 6475 | } |
| 6476 | |
| 6477 | rdev->raid_disk = -1; |
| 6478 | err = bind_rdev_to_array(rdev, mddev); |
| 6479 | |
| 6480 | if (err) |
| 6481 | export_rdev(rdev); |
| 6482 | |
| 6483 | if (mddev_is_clustered(mddev)) { |
| 6484 | if (info->state & (1 << MD_DISK_CANDIDATE)) { |
| 6485 | if (!err) { |
| 6486 | err = md_cluster_ops->new_disk_ack(mddev, |
| 6487 | err == 0); |
| 6488 | if (err) |
| 6489 | md_kick_rdev_from_array(rdev); |
| 6490 | } |
| 6491 | } else { |
| 6492 | if (err) |
| 6493 | md_cluster_ops->add_new_disk_cancel(mddev); |
| 6494 | else |
| 6495 | err = add_bound_rdev(rdev); |
| 6496 | } |
| 6497 | |
| 6498 | } else if (!err) |
| 6499 | err = add_bound_rdev(rdev); |
| 6500 | |
| 6501 | return err; |
| 6502 | } |
| 6503 | |
| 6504 | /* otherwise, add_new_disk is only allowed |
| 6505 | * for major_version==0 superblocks |
| 6506 | */ |
| 6507 | if (mddev->major_version != 0) { |
| 6508 | pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev)); |
| 6509 | return -EINVAL; |
| 6510 | } |
| 6511 | |
| 6512 | if (!(info->state & (1<<MD_DISK_FAULTY))) { |
| 6513 | int err; |
| 6514 | rdev = md_import_device(dev, -1, 0); |
| 6515 | if (IS_ERR(rdev)) { |
| 6516 | pr_warn("md: error, md_import_device() returned %ld\n", |
| 6517 | PTR_ERR(rdev)); |
| 6518 | return PTR_ERR(rdev); |
| 6519 | } |
| 6520 | rdev->desc_nr = info->number; |
| 6521 | if (info->raid_disk < mddev->raid_disks) |
| 6522 | rdev->raid_disk = info->raid_disk; |
| 6523 | else |
| 6524 | rdev->raid_disk = -1; |
| 6525 | |
| 6526 | if (rdev->raid_disk < mddev->raid_disks) |
| 6527 | if (info->state & (1<<MD_DISK_SYNC)) |
| 6528 | set_bit(In_sync, &rdev->flags); |
| 6529 | |
| 6530 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
| 6531 | set_bit(WriteMostly, &rdev->flags); |
| 6532 | if (info->state & (1<<MD_DISK_FAILFAST)) |
| 6533 | set_bit(FailFast, &rdev->flags); |
| 6534 | |
| 6535 | if (!mddev->persistent) { |
| 6536 | pr_debug("md: nonpersistent superblock ...\n"); |
| 6537 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
| 6538 | } else |
| 6539 | rdev->sb_start = calc_dev_sboffset(rdev); |
| 6540 | rdev->sectors = rdev->sb_start; |
| 6541 | |
| 6542 | err = bind_rdev_to_array(rdev, mddev); |
| 6543 | if (err) { |
| 6544 | export_rdev(rdev); |
| 6545 | return err; |
| 6546 | } |
| 6547 | } |
| 6548 | |
| 6549 | return 0; |
| 6550 | } |
| 6551 | |
| 6552 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
| 6553 | { |
| 6554 | char b[BDEVNAME_SIZE]; |
| 6555 | struct md_rdev *rdev; |
| 6556 | |
| 6557 | if (!mddev->pers) |
| 6558 | return -ENODEV; |
| 6559 | |
| 6560 | rdev = find_rdev(mddev, dev); |
| 6561 | if (!rdev) |
| 6562 | return -ENXIO; |
| 6563 | |
| 6564 | if (rdev->raid_disk < 0) |
| 6565 | goto kick_rdev; |
| 6566 | |
| 6567 | clear_bit(Blocked, &rdev->flags); |
| 6568 | remove_and_add_spares(mddev, rdev); |
| 6569 | |
| 6570 | if (rdev->raid_disk >= 0) |
| 6571 | goto busy; |
| 6572 | |
| 6573 | kick_rdev: |
| 6574 | if (mddev_is_clustered(mddev)) |
| 6575 | md_cluster_ops->remove_disk(mddev, rdev); |
| 6576 | |
| 6577 | md_kick_rdev_from_array(rdev); |
| 6578 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 6579 | if (mddev->thread) |
| 6580 | md_wakeup_thread(mddev->thread); |
| 6581 | else |
| 6582 | md_update_sb(mddev, 1); |
| 6583 | md_new_event(mddev); |
| 6584 | |
| 6585 | return 0; |
| 6586 | busy: |
| 6587 | pr_debug("md: cannot remove active disk %s from %s ...\n", |
| 6588 | bdevname(rdev->bdev,b), mdname(mddev)); |
| 6589 | return -EBUSY; |
| 6590 | } |
| 6591 | |
| 6592 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
| 6593 | { |
| 6594 | char b[BDEVNAME_SIZE]; |
| 6595 | int err; |
| 6596 | struct md_rdev *rdev; |
| 6597 | |
| 6598 | if (!mddev->pers) |
| 6599 | return -ENODEV; |
| 6600 | |
| 6601 | if (mddev->major_version != 0) { |
| 6602 | pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n", |
| 6603 | mdname(mddev)); |
| 6604 | return -EINVAL; |
| 6605 | } |
| 6606 | if (!mddev->pers->hot_add_disk) { |
| 6607 | pr_warn("%s: personality does not support diskops!\n", |
| 6608 | mdname(mddev)); |
| 6609 | return -EINVAL; |
| 6610 | } |
| 6611 | |
| 6612 | rdev = md_import_device(dev, -1, 0); |
| 6613 | if (IS_ERR(rdev)) { |
| 6614 | pr_warn("md: error, md_import_device() returned %ld\n", |
| 6615 | PTR_ERR(rdev)); |
| 6616 | return -EINVAL; |
| 6617 | } |
| 6618 | |
| 6619 | if (mddev->persistent) |
| 6620 | rdev->sb_start = calc_dev_sboffset(rdev); |
| 6621 | else |
| 6622 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
| 6623 | |
| 6624 | rdev->sectors = rdev->sb_start; |
| 6625 | |
| 6626 | if (test_bit(Faulty, &rdev->flags)) { |
| 6627 | pr_warn("md: can not hot-add faulty %s disk to %s!\n", |
| 6628 | bdevname(rdev->bdev,b), mdname(mddev)); |
| 6629 | err = -EINVAL; |
| 6630 | goto abort_export; |
| 6631 | } |
| 6632 | |
| 6633 | clear_bit(In_sync, &rdev->flags); |
| 6634 | rdev->desc_nr = -1; |
| 6635 | rdev->saved_raid_disk = -1; |
| 6636 | err = bind_rdev_to_array(rdev, mddev); |
| 6637 | if (err) |
| 6638 | goto abort_export; |
| 6639 | |
| 6640 | /* |
| 6641 | * The rest should better be atomic, we can have disk failures |
| 6642 | * noticed in interrupt contexts ... |
| 6643 | */ |
| 6644 | |
| 6645 | rdev->raid_disk = -1; |
| 6646 | |
| 6647 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 6648 | if (!mddev->thread) |
| 6649 | md_update_sb(mddev, 1); |
| 6650 | /* |
| 6651 | * Kick recovery, maybe this spare has to be added to the |
| 6652 | * array immediately. |
| 6653 | */ |
| 6654 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 6655 | md_wakeup_thread(mddev->thread); |
| 6656 | md_new_event(mddev); |
| 6657 | return 0; |
| 6658 | |
| 6659 | abort_export: |
| 6660 | export_rdev(rdev); |
| 6661 | return err; |
| 6662 | } |
| 6663 | |
| 6664 | static int set_bitmap_file(struct mddev *mddev, int fd) |
| 6665 | { |
| 6666 | int err = 0; |
| 6667 | |
| 6668 | if (mddev->pers) { |
| 6669 | if (!mddev->pers->quiesce || !mddev->thread) |
| 6670 | return -EBUSY; |
| 6671 | if (mddev->recovery || mddev->sync_thread) |
| 6672 | return -EBUSY; |
| 6673 | /* we should be able to change the bitmap.. */ |
| 6674 | } |
| 6675 | |
| 6676 | if (fd >= 0) { |
| 6677 | struct inode *inode; |
| 6678 | struct file *f; |
| 6679 | |
| 6680 | if (mddev->bitmap || mddev->bitmap_info.file) |
| 6681 | return -EEXIST; /* cannot add when bitmap is present */ |
| 6682 | f = fget(fd); |
| 6683 | |
| 6684 | if (f == NULL) { |
| 6685 | pr_warn("%s: error: failed to get bitmap file\n", |
| 6686 | mdname(mddev)); |
| 6687 | return -EBADF; |
| 6688 | } |
| 6689 | |
| 6690 | inode = f->f_mapping->host; |
| 6691 | if (!S_ISREG(inode->i_mode)) { |
| 6692 | pr_warn("%s: error: bitmap file must be a regular file\n", |
| 6693 | mdname(mddev)); |
| 6694 | err = -EBADF; |
| 6695 | } else if (!(f->f_mode & FMODE_WRITE)) { |
| 6696 | pr_warn("%s: error: bitmap file must open for write\n", |
| 6697 | mdname(mddev)); |
| 6698 | err = -EBADF; |
| 6699 | } else if (atomic_read(&inode->i_writecount) != 1) { |
| 6700 | pr_warn("%s: error: bitmap file is already in use\n", |
| 6701 | mdname(mddev)); |
| 6702 | err = -EBUSY; |
| 6703 | } |
| 6704 | if (err) { |
| 6705 | fput(f); |
| 6706 | return err; |
| 6707 | } |
| 6708 | mddev->bitmap_info.file = f; |
| 6709 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
| 6710 | } else if (mddev->bitmap == NULL) |
| 6711 | return -ENOENT; /* cannot remove what isn't there */ |
| 6712 | err = 0; |
| 6713 | if (mddev->pers) { |
| 6714 | if (fd >= 0) { |
| 6715 | struct bitmap *bitmap; |
| 6716 | |
| 6717 | bitmap = bitmap_create(mddev, -1); |
| 6718 | mddev_suspend(mddev); |
| 6719 | if (!IS_ERR(bitmap)) { |
| 6720 | mddev->bitmap = bitmap; |
| 6721 | err = bitmap_load(mddev); |
| 6722 | } else |
| 6723 | err = PTR_ERR(bitmap); |
| 6724 | if (err) { |
| 6725 | bitmap_destroy(mddev); |
| 6726 | fd = -1; |
| 6727 | } |
| 6728 | mddev_resume(mddev); |
| 6729 | } else if (fd < 0) { |
| 6730 | mddev_suspend(mddev); |
| 6731 | bitmap_destroy(mddev); |
| 6732 | mddev_resume(mddev); |
| 6733 | } |
| 6734 | } |
| 6735 | if (fd < 0) { |
| 6736 | struct file *f = mddev->bitmap_info.file; |
| 6737 | if (f) { |
| 6738 | spin_lock(&mddev->lock); |
| 6739 | mddev->bitmap_info.file = NULL; |
| 6740 | spin_unlock(&mddev->lock); |
| 6741 | fput(f); |
| 6742 | } |
| 6743 | } |
| 6744 | |
| 6745 | return err; |
| 6746 | } |
| 6747 | |
| 6748 | /* |
| 6749 | * set_array_info is used two different ways |
| 6750 | * The original usage is when creating a new array. |
| 6751 | * In this usage, raid_disks is > 0 and it together with |
| 6752 | * level, size, not_persistent,layout,chunksize determine the |
| 6753 | * shape of the array. |
| 6754 | * This will always create an array with a type-0.90.0 superblock. |
| 6755 | * The newer usage is when assembling an array. |
| 6756 | * In this case raid_disks will be 0, and the major_version field is |
| 6757 | * use to determine which style super-blocks are to be found on the devices. |
| 6758 | * The minor and patch _version numbers are also kept incase the |
| 6759 | * super_block handler wishes to interpret them. |
| 6760 | */ |
| 6761 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
| 6762 | { |
| 6763 | |
| 6764 | if (info->raid_disks == 0) { |
| 6765 | /* just setting version number for superblock loading */ |
| 6766 | if (info->major_version < 0 || |
| 6767 | info->major_version >= ARRAY_SIZE(super_types) || |
| 6768 | super_types[info->major_version].name == NULL) { |
| 6769 | /* maybe try to auto-load a module? */ |
| 6770 | pr_warn("md: superblock version %d not known\n", |
| 6771 | info->major_version); |
| 6772 | return -EINVAL; |
| 6773 | } |
| 6774 | mddev->major_version = info->major_version; |
| 6775 | mddev->minor_version = info->minor_version; |
| 6776 | mddev->patch_version = info->patch_version; |
| 6777 | mddev->persistent = !info->not_persistent; |
| 6778 | /* ensure mddev_put doesn't delete this now that there |
| 6779 | * is some minimal configuration. |
| 6780 | */ |
| 6781 | mddev->ctime = ktime_get_real_seconds(); |
| 6782 | return 0; |
| 6783 | } |
| 6784 | mddev->major_version = MD_MAJOR_VERSION; |
| 6785 | mddev->minor_version = MD_MINOR_VERSION; |
| 6786 | mddev->patch_version = MD_PATCHLEVEL_VERSION; |
| 6787 | mddev->ctime = ktime_get_real_seconds(); |
| 6788 | |
| 6789 | mddev->level = info->level; |
| 6790 | mddev->clevel[0] = 0; |
| 6791 | mddev->dev_sectors = 2 * (sector_t)info->size; |
| 6792 | mddev->raid_disks = info->raid_disks; |
| 6793 | /* don't set md_minor, it is determined by which /dev/md* was |
| 6794 | * openned |
| 6795 | */ |
| 6796 | if (info->state & (1<<MD_SB_CLEAN)) |
| 6797 | mddev->recovery_cp = MaxSector; |
| 6798 | else |
| 6799 | mddev->recovery_cp = 0; |
| 6800 | mddev->persistent = ! info->not_persistent; |
| 6801 | mddev->external = 0; |
| 6802 | |
| 6803 | mddev->layout = info->layout; |
| 6804 | mddev->chunk_sectors = info->chunk_size >> 9; |
| 6805 | |
| 6806 | if (mddev->persistent) { |
| 6807 | mddev->max_disks = MD_SB_DISKS; |
| 6808 | mddev->flags = 0; |
| 6809 | mddev->sb_flags = 0; |
| 6810 | } |
| 6811 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 6812 | |
| 6813 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
| 6814 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
| 6815 | mddev->bitmap_info.offset = 0; |
| 6816 | |
| 6817 | mddev->reshape_position = MaxSector; |
| 6818 | |
| 6819 | /* |
| 6820 | * Generate a 128 bit UUID |
| 6821 | */ |
| 6822 | get_random_bytes(mddev->uuid, 16); |
| 6823 | |
| 6824 | mddev->new_level = mddev->level; |
| 6825 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
| 6826 | mddev->new_layout = mddev->layout; |
| 6827 | mddev->delta_disks = 0; |
| 6828 | mddev->reshape_backwards = 0; |
| 6829 | |
| 6830 | return 0; |
| 6831 | } |
| 6832 | |
| 6833 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
| 6834 | { |
| 6835 | lockdep_assert_held(&mddev->reconfig_mutex); |
| 6836 | |
| 6837 | if (mddev->external_size) |
| 6838 | return; |
| 6839 | |
| 6840 | mddev->array_sectors = array_sectors; |
| 6841 | } |
| 6842 | EXPORT_SYMBOL(md_set_array_sectors); |
| 6843 | |
| 6844 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
| 6845 | { |
| 6846 | struct md_rdev *rdev; |
| 6847 | int rv; |
| 6848 | int fit = (num_sectors == 0); |
| 6849 | sector_t old_dev_sectors = mddev->dev_sectors; |
| 6850 | |
| 6851 | if (mddev->pers->resize == NULL) |
| 6852 | return -EINVAL; |
| 6853 | /* The "num_sectors" is the number of sectors of each device that |
| 6854 | * is used. This can only make sense for arrays with redundancy. |
| 6855 | * linear and raid0 always use whatever space is available. We can only |
| 6856 | * consider changing this number if no resync or reconstruction is |
| 6857 | * happening, and if the new size is acceptable. It must fit before the |
| 6858 | * sb_start or, if that is <data_offset, it must fit before the size |
| 6859 | * of each device. If num_sectors is zero, we find the largest size |
| 6860 | * that fits. |
| 6861 | */ |
| 6862 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| 6863 | mddev->sync_thread) |
| 6864 | return -EBUSY; |
| 6865 | if (mddev->ro) |
| 6866 | return -EROFS; |
| 6867 | |
| 6868 | rdev_for_each(rdev, mddev) { |
| 6869 | sector_t avail = rdev->sectors; |
| 6870 | |
| 6871 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
| 6872 | num_sectors = avail; |
| 6873 | if (avail < num_sectors) |
| 6874 | return -ENOSPC; |
| 6875 | } |
| 6876 | rv = mddev->pers->resize(mddev, num_sectors); |
| 6877 | if (!rv) { |
| 6878 | if (mddev_is_clustered(mddev)) |
| 6879 | md_cluster_ops->update_size(mddev, old_dev_sectors); |
| 6880 | else if (mddev->queue) { |
| 6881 | set_capacity(mddev->gendisk, mddev->array_sectors); |
| 6882 | revalidate_disk(mddev->gendisk); |
| 6883 | } |
| 6884 | } |
| 6885 | return rv; |
| 6886 | } |
| 6887 | |
| 6888 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
| 6889 | { |
| 6890 | int rv; |
| 6891 | struct md_rdev *rdev; |
| 6892 | /* change the number of raid disks */ |
| 6893 | if (mddev->pers->check_reshape == NULL) |
| 6894 | return -EINVAL; |
| 6895 | if (mddev->ro) |
| 6896 | return -EROFS; |
| 6897 | if (raid_disks <= 0 || |
| 6898 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
| 6899 | return -EINVAL; |
| 6900 | if (mddev->sync_thread || |
| 6901 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| 6902 | mddev->reshape_position != MaxSector) |
| 6903 | return -EBUSY; |
| 6904 | |
| 6905 | rdev_for_each(rdev, mddev) { |
| 6906 | if (mddev->raid_disks < raid_disks && |
| 6907 | rdev->data_offset < rdev->new_data_offset) |
| 6908 | return -EINVAL; |
| 6909 | if (mddev->raid_disks > raid_disks && |
| 6910 | rdev->data_offset > rdev->new_data_offset) |
| 6911 | return -EINVAL; |
| 6912 | } |
| 6913 | |
| 6914 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
| 6915 | if (mddev->delta_disks < 0) |
| 6916 | mddev->reshape_backwards = 1; |
| 6917 | else if (mddev->delta_disks > 0) |
| 6918 | mddev->reshape_backwards = 0; |
| 6919 | |
| 6920 | rv = mddev->pers->check_reshape(mddev); |
| 6921 | if (rv < 0) { |
| 6922 | mddev->delta_disks = 0; |
| 6923 | mddev->reshape_backwards = 0; |
| 6924 | } |
| 6925 | return rv; |
| 6926 | } |
| 6927 | |
| 6928 | /* |
| 6929 | * update_array_info is used to change the configuration of an |
| 6930 | * on-line array. |
| 6931 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size |
| 6932 | * fields in the info are checked against the array. |
| 6933 | * Any differences that cannot be handled will cause an error. |
| 6934 | * Normally, only one change can be managed at a time. |
| 6935 | */ |
| 6936 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
| 6937 | { |
| 6938 | int rv = 0; |
| 6939 | int cnt = 0; |
| 6940 | int state = 0; |
| 6941 | |
| 6942 | /* calculate expected state,ignoring low bits */ |
| 6943 | if (mddev->bitmap && mddev->bitmap_info.offset) |
| 6944 | state |= (1 << MD_SB_BITMAP_PRESENT); |
| 6945 | |
| 6946 | if (mddev->major_version != info->major_version || |
| 6947 | mddev->minor_version != info->minor_version || |
| 6948 | /* mddev->patch_version != info->patch_version || */ |
| 6949 | mddev->ctime != info->ctime || |
| 6950 | mddev->level != info->level || |
| 6951 | /* mddev->layout != info->layout || */ |
| 6952 | mddev->persistent != !info->not_persistent || |
| 6953 | mddev->chunk_sectors != info->chunk_size >> 9 || |
| 6954 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
| 6955 | ((state^info->state) & 0xfffffe00) |
| 6956 | ) |
| 6957 | return -EINVAL; |
| 6958 | /* Check there is only one change */ |
| 6959 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
| 6960 | cnt++; |
| 6961 | if (mddev->raid_disks != info->raid_disks) |
| 6962 | cnt++; |
| 6963 | if (mddev->layout != info->layout) |
| 6964 | cnt++; |
| 6965 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) |
| 6966 | cnt++; |
| 6967 | if (cnt == 0) |
| 6968 | return 0; |
| 6969 | if (cnt > 1) |
| 6970 | return -EINVAL; |
| 6971 | |
| 6972 | if (mddev->layout != info->layout) { |
| 6973 | /* Change layout |
| 6974 | * we don't need to do anything at the md level, the |
| 6975 | * personality will take care of it all. |
| 6976 | */ |
| 6977 | if (mddev->pers->check_reshape == NULL) |
| 6978 | return -EINVAL; |
| 6979 | else { |
| 6980 | mddev->new_layout = info->layout; |
| 6981 | rv = mddev->pers->check_reshape(mddev); |
| 6982 | if (rv) |
| 6983 | mddev->new_layout = mddev->layout; |
| 6984 | return rv; |
| 6985 | } |
| 6986 | } |
| 6987 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
| 6988 | rv = update_size(mddev, (sector_t)info->size * 2); |
| 6989 | |
| 6990 | if (mddev->raid_disks != info->raid_disks) |
| 6991 | rv = update_raid_disks(mddev, info->raid_disks); |
| 6992 | |
| 6993 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
| 6994 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { |
| 6995 | rv = -EINVAL; |
| 6996 | goto err; |
| 6997 | } |
| 6998 | if (mddev->recovery || mddev->sync_thread) { |
| 6999 | rv = -EBUSY; |
| 7000 | goto err; |
| 7001 | } |
| 7002 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { |
| 7003 | struct bitmap *bitmap; |
| 7004 | /* add the bitmap */ |
| 7005 | if (mddev->bitmap) { |
| 7006 | rv = -EEXIST; |
| 7007 | goto err; |
| 7008 | } |
| 7009 | if (mddev->bitmap_info.default_offset == 0) { |
| 7010 | rv = -EINVAL; |
| 7011 | goto err; |
| 7012 | } |
| 7013 | mddev->bitmap_info.offset = |
| 7014 | mddev->bitmap_info.default_offset; |
| 7015 | mddev->bitmap_info.space = |
| 7016 | mddev->bitmap_info.default_space; |
| 7017 | bitmap = bitmap_create(mddev, -1); |
| 7018 | mddev_suspend(mddev); |
| 7019 | if (!IS_ERR(bitmap)) { |
| 7020 | mddev->bitmap = bitmap; |
| 7021 | rv = bitmap_load(mddev); |
| 7022 | } else |
| 7023 | rv = PTR_ERR(bitmap); |
| 7024 | if (rv) |
| 7025 | bitmap_destroy(mddev); |
| 7026 | mddev_resume(mddev); |
| 7027 | } else { |
| 7028 | /* remove the bitmap */ |
| 7029 | if (!mddev->bitmap) { |
| 7030 | rv = -ENOENT; |
| 7031 | goto err; |
| 7032 | } |
| 7033 | if (mddev->bitmap->storage.file) { |
| 7034 | rv = -EINVAL; |
| 7035 | goto err; |
| 7036 | } |
| 7037 | if (mddev->bitmap_info.nodes) { |
| 7038 | /* hold PW on all the bitmap lock */ |
| 7039 | if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { |
| 7040 | pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n"); |
| 7041 | rv = -EPERM; |
| 7042 | md_cluster_ops->unlock_all_bitmaps(mddev); |
| 7043 | goto err; |
| 7044 | } |
| 7045 | |
| 7046 | mddev->bitmap_info.nodes = 0; |
| 7047 | md_cluster_ops->leave(mddev); |
| 7048 | } |
| 7049 | mddev_suspend(mddev); |
| 7050 | bitmap_destroy(mddev); |
| 7051 | mddev_resume(mddev); |
| 7052 | mddev->bitmap_info.offset = 0; |
| 7053 | } |
| 7054 | } |
| 7055 | md_update_sb(mddev, 1); |
| 7056 | return rv; |
| 7057 | err: |
| 7058 | return rv; |
| 7059 | } |
| 7060 | |
| 7061 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
| 7062 | { |
| 7063 | struct md_rdev *rdev; |
| 7064 | int err = 0; |
| 7065 | |
| 7066 | if (mddev->pers == NULL) |
| 7067 | return -ENODEV; |
| 7068 | |
| 7069 | rcu_read_lock(); |
| 7070 | rdev = md_find_rdev_rcu(mddev, dev); |
| 7071 | if (!rdev) |
| 7072 | err = -ENODEV; |
| 7073 | else { |
| 7074 | md_error(mddev, rdev); |
| 7075 | if (!test_bit(Faulty, &rdev->flags)) |
| 7076 | err = -EBUSY; |
| 7077 | } |
| 7078 | rcu_read_unlock(); |
| 7079 | return err; |
| 7080 | } |
| 7081 | |
| 7082 | /* |
| 7083 | * We have a problem here : there is no easy way to give a CHS |
| 7084 | * virtual geometry. We currently pretend that we have a 2 heads |
| 7085 | * 4 sectors (with a BIG number of cylinders...). This drives |
| 7086 | * dosfs just mad... ;-) |
| 7087 | */ |
| 7088 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 7089 | { |
| 7090 | struct mddev *mddev = bdev->bd_disk->private_data; |
| 7091 | |
| 7092 | geo->heads = 2; |
| 7093 | geo->sectors = 4; |
| 7094 | geo->cylinders = mddev->array_sectors / 8; |
| 7095 | return 0; |
| 7096 | } |
| 7097 | |
| 7098 | static inline bool md_ioctl_valid(unsigned int cmd) |
| 7099 | { |
| 7100 | switch (cmd) { |
| 7101 | case ADD_NEW_DISK: |
| 7102 | case BLKROSET: |
| 7103 | case GET_ARRAY_INFO: |
| 7104 | case GET_BITMAP_FILE: |
| 7105 | case GET_DISK_INFO: |
| 7106 | case HOT_ADD_DISK: |
| 7107 | case HOT_REMOVE_DISK: |
| 7108 | case RAID_AUTORUN: |
| 7109 | case RAID_VERSION: |
| 7110 | case RESTART_ARRAY_RW: |
| 7111 | case RUN_ARRAY: |
| 7112 | case SET_ARRAY_INFO: |
| 7113 | case SET_BITMAP_FILE: |
| 7114 | case SET_DISK_FAULTY: |
| 7115 | case STOP_ARRAY: |
| 7116 | case STOP_ARRAY_RO: |
| 7117 | case CLUSTERED_DISK_NACK: |
| 7118 | return true; |
| 7119 | default: |
| 7120 | return false; |
| 7121 | } |
| 7122 | } |
| 7123 | |
| 7124 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
| 7125 | unsigned int cmd, unsigned long arg) |
| 7126 | { |
| 7127 | int err = 0; |
| 7128 | void __user *argp = (void __user *)arg; |
| 7129 | struct mddev *mddev = NULL; |
| 7130 | int ro; |
| 7131 | bool did_set_md_closing = false; |
| 7132 | |
| 7133 | if (!md_ioctl_valid(cmd)) |
| 7134 | return -ENOTTY; |
| 7135 | |
| 7136 | switch (cmd) { |
| 7137 | case RAID_VERSION: |
| 7138 | case GET_ARRAY_INFO: |
| 7139 | case GET_DISK_INFO: |
| 7140 | break; |
| 7141 | default: |
| 7142 | if (!capable(CAP_SYS_ADMIN)) |
| 7143 | return -EACCES; |
| 7144 | } |
| 7145 | |
| 7146 | /* |
| 7147 | * Commands dealing with the RAID driver but not any |
| 7148 | * particular array: |
| 7149 | */ |
| 7150 | switch (cmd) { |
| 7151 | case RAID_VERSION: |
| 7152 | err = get_version(argp); |
| 7153 | goto out; |
| 7154 | |
| 7155 | #ifndef MODULE |
| 7156 | case RAID_AUTORUN: |
| 7157 | err = 0; |
| 7158 | autostart_arrays(arg); |
| 7159 | goto out; |
| 7160 | #endif |
| 7161 | default:; |
| 7162 | } |
| 7163 | |
| 7164 | /* |
| 7165 | * Commands creating/starting a new array: |
| 7166 | */ |
| 7167 | |
| 7168 | mddev = bdev->bd_disk->private_data; |
| 7169 | |
| 7170 | if (!mddev) { |
| 7171 | BUG(); |
| 7172 | goto out; |
| 7173 | } |
| 7174 | |
| 7175 | /* Some actions do not requires the mutex */ |
| 7176 | switch (cmd) { |
| 7177 | case GET_ARRAY_INFO: |
| 7178 | if (!mddev->raid_disks && !mddev->external) |
| 7179 | err = -ENODEV; |
| 7180 | else |
| 7181 | err = get_array_info(mddev, argp); |
| 7182 | goto out; |
| 7183 | |
| 7184 | case GET_DISK_INFO: |
| 7185 | if (!mddev->raid_disks && !mddev->external) |
| 7186 | err = -ENODEV; |
| 7187 | else |
| 7188 | err = get_disk_info(mddev, argp); |
| 7189 | goto out; |
| 7190 | |
| 7191 | case SET_DISK_FAULTY: |
| 7192 | err = set_disk_faulty(mddev, new_decode_dev(arg)); |
| 7193 | goto out; |
| 7194 | |
| 7195 | case GET_BITMAP_FILE: |
| 7196 | err = get_bitmap_file(mddev, argp); |
| 7197 | goto out; |
| 7198 | |
| 7199 | } |
| 7200 | |
| 7201 | if (cmd == ADD_NEW_DISK) |
| 7202 | /* need to ensure md_delayed_delete() has completed */ |
| 7203 | flush_workqueue(md_misc_wq); |
| 7204 | |
| 7205 | if (cmd == HOT_REMOVE_DISK) |
| 7206 | /* need to ensure recovery thread has run */ |
| 7207 | wait_event_interruptible_timeout(mddev->sb_wait, |
| 7208 | !test_bit(MD_RECOVERY_NEEDED, |
| 7209 | &mddev->recovery), |
| 7210 | msecs_to_jiffies(5000)); |
| 7211 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
| 7212 | /* Need to flush page cache, and ensure no-one else opens |
| 7213 | * and writes |
| 7214 | */ |
| 7215 | mutex_lock(&mddev->open_mutex); |
| 7216 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
| 7217 | mutex_unlock(&mddev->open_mutex); |
| 7218 | err = -EBUSY; |
| 7219 | goto out; |
| 7220 | } |
| 7221 | WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags)); |
| 7222 | set_bit(MD_CLOSING, &mddev->flags); |
| 7223 | did_set_md_closing = true; |
| 7224 | mutex_unlock(&mddev->open_mutex); |
| 7225 | sync_blockdev(bdev); |
| 7226 | } |
| 7227 | err = mddev_lock(mddev); |
| 7228 | if (err) { |
| 7229 | pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n", |
| 7230 | err, cmd); |
| 7231 | goto out; |
| 7232 | } |
| 7233 | |
| 7234 | if (cmd == SET_ARRAY_INFO) { |
| 7235 | mdu_array_info_t info; |
| 7236 | if (!arg) |
| 7237 | memset(&info, 0, sizeof(info)); |
| 7238 | else if (copy_from_user(&info, argp, sizeof(info))) { |
| 7239 | err = -EFAULT; |
| 7240 | goto unlock; |
| 7241 | } |
| 7242 | if (mddev->pers) { |
| 7243 | err = update_array_info(mddev, &info); |
| 7244 | if (err) { |
| 7245 | pr_warn("md: couldn't update array info. %d\n", err); |
| 7246 | goto unlock; |
| 7247 | } |
| 7248 | goto unlock; |
| 7249 | } |
| 7250 | if (!list_empty(&mddev->disks)) { |
| 7251 | pr_warn("md: array %s already has disks!\n", mdname(mddev)); |
| 7252 | err = -EBUSY; |
| 7253 | goto unlock; |
| 7254 | } |
| 7255 | if (mddev->raid_disks) { |
| 7256 | pr_warn("md: array %s already initialised!\n", mdname(mddev)); |
| 7257 | err = -EBUSY; |
| 7258 | goto unlock; |
| 7259 | } |
| 7260 | err = set_array_info(mddev, &info); |
| 7261 | if (err) { |
| 7262 | pr_warn("md: couldn't set array info. %d\n", err); |
| 7263 | goto unlock; |
| 7264 | } |
| 7265 | goto unlock; |
| 7266 | } |
| 7267 | |
| 7268 | /* |
| 7269 | * Commands querying/configuring an existing array: |
| 7270 | */ |
| 7271 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
| 7272 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
| 7273 | if ((!mddev->raid_disks && !mddev->external) |
| 7274 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY |
| 7275 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE |
| 7276 | && cmd != GET_BITMAP_FILE) { |
| 7277 | err = -ENODEV; |
| 7278 | goto unlock; |
| 7279 | } |
| 7280 | |
| 7281 | /* |
| 7282 | * Commands even a read-only array can execute: |
| 7283 | */ |
| 7284 | switch (cmd) { |
| 7285 | case RESTART_ARRAY_RW: |
| 7286 | err = restart_array(mddev); |
| 7287 | goto unlock; |
| 7288 | |
| 7289 | case STOP_ARRAY: |
| 7290 | err = do_md_stop(mddev, 0, bdev); |
| 7291 | goto unlock; |
| 7292 | |
| 7293 | case STOP_ARRAY_RO: |
| 7294 | err = md_set_readonly(mddev, bdev); |
| 7295 | goto unlock; |
| 7296 | |
| 7297 | case HOT_REMOVE_DISK: |
| 7298 | err = hot_remove_disk(mddev, new_decode_dev(arg)); |
| 7299 | goto unlock; |
| 7300 | |
| 7301 | case ADD_NEW_DISK: |
| 7302 | /* We can support ADD_NEW_DISK on read-only arrays |
| 7303 | * only if we are re-adding a preexisting device. |
| 7304 | * So require mddev->pers and MD_DISK_SYNC. |
| 7305 | */ |
| 7306 | if (mddev->pers) { |
| 7307 | mdu_disk_info_t info; |
| 7308 | if (copy_from_user(&info, argp, sizeof(info))) |
| 7309 | err = -EFAULT; |
| 7310 | else if (!(info.state & (1<<MD_DISK_SYNC))) |
| 7311 | /* Need to clear read-only for this */ |
| 7312 | break; |
| 7313 | else |
| 7314 | err = add_new_disk(mddev, &info); |
| 7315 | goto unlock; |
| 7316 | } |
| 7317 | break; |
| 7318 | |
| 7319 | case BLKROSET: |
| 7320 | if (get_user(ro, (int __user *)(arg))) { |
| 7321 | err = -EFAULT; |
| 7322 | goto unlock; |
| 7323 | } |
| 7324 | err = -EINVAL; |
| 7325 | |
| 7326 | /* if the bdev is going readonly the value of mddev->ro |
| 7327 | * does not matter, no writes are coming |
| 7328 | */ |
| 7329 | if (ro) |
| 7330 | goto unlock; |
| 7331 | |
| 7332 | /* are we are already prepared for writes? */ |
| 7333 | if (mddev->ro != 1) |
| 7334 | goto unlock; |
| 7335 | |
| 7336 | /* transitioning to readauto need only happen for |
| 7337 | * arrays that call md_write_start |
| 7338 | */ |
| 7339 | if (mddev->pers) { |
| 7340 | err = restart_array(mddev); |
| 7341 | if (err == 0) { |
| 7342 | mddev->ro = 2; |
| 7343 | set_disk_ro(mddev->gendisk, 0); |
| 7344 | } |
| 7345 | } |
| 7346 | goto unlock; |
| 7347 | } |
| 7348 | |
| 7349 | /* |
| 7350 | * The remaining ioctls are changing the state of the |
| 7351 | * superblock, so we do not allow them on read-only arrays. |
| 7352 | */ |
| 7353 | if (mddev->ro && mddev->pers) { |
| 7354 | if (mddev->ro == 2) { |
| 7355 | mddev->ro = 0; |
| 7356 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 7357 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 7358 | /* mddev_unlock will wake thread */ |
| 7359 | /* If a device failed while we were read-only, we |
| 7360 | * need to make sure the metadata is updated now. |
| 7361 | */ |
| 7362 | if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) { |
| 7363 | mddev_unlock(mddev); |
| 7364 | wait_event(mddev->sb_wait, |
| 7365 | !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) && |
| 7366 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); |
| 7367 | mddev_lock_nointr(mddev); |
| 7368 | } |
| 7369 | } else { |
| 7370 | err = -EROFS; |
| 7371 | goto unlock; |
| 7372 | } |
| 7373 | } |
| 7374 | |
| 7375 | switch (cmd) { |
| 7376 | case ADD_NEW_DISK: |
| 7377 | { |
| 7378 | mdu_disk_info_t info; |
| 7379 | if (copy_from_user(&info, argp, sizeof(info))) |
| 7380 | err = -EFAULT; |
| 7381 | else |
| 7382 | err = add_new_disk(mddev, &info); |
| 7383 | goto unlock; |
| 7384 | } |
| 7385 | |
| 7386 | case CLUSTERED_DISK_NACK: |
| 7387 | if (mddev_is_clustered(mddev)) |
| 7388 | md_cluster_ops->new_disk_ack(mddev, false); |
| 7389 | else |
| 7390 | err = -EINVAL; |
| 7391 | goto unlock; |
| 7392 | |
| 7393 | case HOT_ADD_DISK: |
| 7394 | err = hot_add_disk(mddev, new_decode_dev(arg)); |
| 7395 | goto unlock; |
| 7396 | |
| 7397 | case RUN_ARRAY: |
| 7398 | err = do_md_run(mddev); |
| 7399 | goto unlock; |
| 7400 | |
| 7401 | case SET_BITMAP_FILE: |
| 7402 | err = set_bitmap_file(mddev, (int)arg); |
| 7403 | goto unlock; |
| 7404 | |
| 7405 | default: |
| 7406 | err = -EINVAL; |
| 7407 | goto unlock; |
| 7408 | } |
| 7409 | |
| 7410 | unlock: |
| 7411 | if (mddev->hold_active == UNTIL_IOCTL && |
| 7412 | err != -EINVAL) |
| 7413 | mddev->hold_active = 0; |
| 7414 | mddev_unlock(mddev); |
| 7415 | out: |
| 7416 | if(did_set_md_closing) |
| 7417 | clear_bit(MD_CLOSING, &mddev->flags); |
| 7418 | return err; |
| 7419 | } |
| 7420 | #ifdef CONFIG_COMPAT |
| 7421 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, |
| 7422 | unsigned int cmd, unsigned long arg) |
| 7423 | { |
| 7424 | switch (cmd) { |
| 7425 | case HOT_REMOVE_DISK: |
| 7426 | case HOT_ADD_DISK: |
| 7427 | case SET_DISK_FAULTY: |
| 7428 | case SET_BITMAP_FILE: |
| 7429 | /* These take in integer arg, do not convert */ |
| 7430 | break; |
| 7431 | default: |
| 7432 | arg = (unsigned long)compat_ptr(arg); |
| 7433 | break; |
| 7434 | } |
| 7435 | |
| 7436 | return md_ioctl(bdev, mode, cmd, arg); |
| 7437 | } |
| 7438 | #endif /* CONFIG_COMPAT */ |
| 7439 | |
| 7440 | static int md_open(struct block_device *bdev, fmode_t mode) |
| 7441 | { |
| 7442 | /* |
| 7443 | * Succeed if we can lock the mddev, which confirms that |
| 7444 | * it isn't being stopped right now. |
| 7445 | */ |
| 7446 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
| 7447 | int err; |
| 7448 | |
| 7449 | if (!mddev) |
| 7450 | return -ENODEV; |
| 7451 | |
| 7452 | if (mddev->gendisk != bdev->bd_disk) { |
| 7453 | /* we are racing with mddev_put which is discarding this |
| 7454 | * bd_disk. |
| 7455 | */ |
| 7456 | mddev_put(mddev); |
| 7457 | /* Wait until bdev->bd_disk is definitely gone */ |
| 7458 | flush_workqueue(md_misc_wq); |
| 7459 | /* Then retry the open from the top */ |
| 7460 | return -ERESTARTSYS; |
| 7461 | } |
| 7462 | BUG_ON(mddev != bdev->bd_disk->private_data); |
| 7463 | |
| 7464 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
| 7465 | goto out; |
| 7466 | |
| 7467 | if (test_bit(MD_CLOSING, &mddev->flags)) { |
| 7468 | mutex_unlock(&mddev->open_mutex); |
| 7469 | err = -ENODEV; |
| 7470 | goto out; |
| 7471 | } |
| 7472 | |
| 7473 | err = 0; |
| 7474 | atomic_inc(&mddev->openers); |
| 7475 | mutex_unlock(&mddev->open_mutex); |
| 7476 | |
| 7477 | check_disk_change(bdev); |
| 7478 | out: |
| 7479 | if (err) |
| 7480 | mddev_put(mddev); |
| 7481 | return err; |
| 7482 | } |
| 7483 | |
| 7484 | static void md_release(struct gendisk *disk, fmode_t mode) |
| 7485 | { |
| 7486 | struct mddev *mddev = disk->private_data; |
| 7487 | |
| 7488 | BUG_ON(!mddev); |
| 7489 | atomic_dec(&mddev->openers); |
| 7490 | mddev_put(mddev); |
| 7491 | } |
| 7492 | |
| 7493 | static int md_media_changed(struct gendisk *disk) |
| 7494 | { |
| 7495 | struct mddev *mddev = disk->private_data; |
| 7496 | |
| 7497 | return mddev->changed; |
| 7498 | } |
| 7499 | |
| 7500 | static int md_revalidate(struct gendisk *disk) |
| 7501 | { |
| 7502 | struct mddev *mddev = disk->private_data; |
| 7503 | |
| 7504 | mddev->changed = 0; |
| 7505 | return 0; |
| 7506 | } |
| 7507 | static const struct block_device_operations md_fops = |
| 7508 | { |
| 7509 | .owner = THIS_MODULE, |
| 7510 | .open = md_open, |
| 7511 | .release = md_release, |
| 7512 | .ioctl = md_ioctl, |
| 7513 | #ifdef CONFIG_COMPAT |
| 7514 | .compat_ioctl = md_compat_ioctl, |
| 7515 | #endif |
| 7516 | .getgeo = md_getgeo, |
| 7517 | .media_changed = md_media_changed, |
| 7518 | .revalidate_disk= md_revalidate, |
| 7519 | }; |
| 7520 | |
| 7521 | static int md_thread(void *arg) |
| 7522 | { |
| 7523 | struct md_thread *thread = arg; |
| 7524 | |
| 7525 | /* |
| 7526 | * md_thread is a 'system-thread', it's priority should be very |
| 7527 | * high. We avoid resource deadlocks individually in each |
| 7528 | * raid personality. (RAID5 does preallocation) We also use RR and |
| 7529 | * the very same RT priority as kswapd, thus we will never get |
| 7530 | * into a priority inversion deadlock. |
| 7531 | * |
| 7532 | * we definitely have to have equal or higher priority than |
| 7533 | * bdflush, otherwise bdflush will deadlock if there are too |
| 7534 | * many dirty RAID5 blocks. |
| 7535 | */ |
| 7536 | |
| 7537 | allow_signal(SIGKILL); |
| 7538 | while (!kthread_should_stop()) { |
| 7539 | |
| 7540 | /* We need to wait INTERRUPTIBLE so that |
| 7541 | * we don't add to the load-average. |
| 7542 | * That means we need to be sure no signals are |
| 7543 | * pending |
| 7544 | */ |
| 7545 | if (signal_pending(current)) |
| 7546 | flush_signals(current); |
| 7547 | |
| 7548 | wait_event_interruptible_timeout |
| 7549 | (thread->wqueue, |
| 7550 | test_bit(THREAD_WAKEUP, &thread->flags) |
| 7551 | || kthread_should_stop() || kthread_should_park(), |
| 7552 | thread->timeout); |
| 7553 | |
| 7554 | clear_bit(THREAD_WAKEUP, &thread->flags); |
| 7555 | if (kthread_should_park()) |
| 7556 | kthread_parkme(); |
| 7557 | if (!kthread_should_stop()) |
| 7558 | thread->run(thread); |
| 7559 | } |
| 7560 | |
| 7561 | return 0; |
| 7562 | } |
| 7563 | |
| 7564 | void md_wakeup_thread(struct md_thread *thread) |
| 7565 | { |
| 7566 | if (thread) { |
| 7567 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
| 7568 | set_bit(THREAD_WAKEUP, &thread->flags); |
| 7569 | wake_up(&thread->wqueue); |
| 7570 | } |
| 7571 | } |
| 7572 | EXPORT_SYMBOL(md_wakeup_thread); |
| 7573 | |
| 7574 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
| 7575 | struct mddev *mddev, const char *name) |
| 7576 | { |
| 7577 | struct md_thread *thread; |
| 7578 | |
| 7579 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
| 7580 | if (!thread) |
| 7581 | return NULL; |
| 7582 | |
| 7583 | init_waitqueue_head(&thread->wqueue); |
| 7584 | |
| 7585 | thread->run = run; |
| 7586 | thread->mddev = mddev; |
| 7587 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
| 7588 | thread->tsk = kthread_run(md_thread, thread, |
| 7589 | "%s_%s", |
| 7590 | mdname(thread->mddev), |
| 7591 | name); |
| 7592 | if (IS_ERR(thread->tsk)) { |
| 7593 | kfree(thread); |
| 7594 | return NULL; |
| 7595 | } |
| 7596 | return thread; |
| 7597 | } |
| 7598 | EXPORT_SYMBOL(md_register_thread); |
| 7599 | |
| 7600 | void md_unregister_thread(struct md_thread **threadp) |
| 7601 | { |
| 7602 | struct md_thread *thread = *threadp; |
| 7603 | if (!thread) |
| 7604 | return; |
| 7605 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
| 7606 | /* Locking ensures that mddev_unlock does not wake_up a |
| 7607 | * non-existent thread |
| 7608 | */ |
| 7609 | spin_lock(&pers_lock); |
| 7610 | *threadp = NULL; |
| 7611 | spin_unlock(&pers_lock); |
| 7612 | |
| 7613 | kthread_stop(thread->tsk); |
| 7614 | kfree(thread); |
| 7615 | } |
| 7616 | EXPORT_SYMBOL(md_unregister_thread); |
| 7617 | |
| 7618 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
| 7619 | { |
| 7620 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
| 7621 | return; |
| 7622 | |
| 7623 | if (!mddev->pers || !mddev->pers->error_handler) |
| 7624 | return; |
| 7625 | mddev->pers->error_handler(mddev,rdev); |
| 7626 | if (mddev->degraded) |
| 7627 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 7628 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
| 7629 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 7630 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 7631 | md_wakeup_thread(mddev->thread); |
| 7632 | if (mddev->event_work.func) |
| 7633 | queue_work(md_misc_wq, &mddev->event_work); |
| 7634 | md_new_event(mddev); |
| 7635 | } |
| 7636 | EXPORT_SYMBOL(md_error); |
| 7637 | |
| 7638 | /* seq_file implementation /proc/mdstat */ |
| 7639 | |
| 7640 | static void status_unused(struct seq_file *seq) |
| 7641 | { |
| 7642 | int i = 0; |
| 7643 | struct md_rdev *rdev; |
| 7644 | |
| 7645 | seq_printf(seq, "unused devices: "); |
| 7646 | |
| 7647 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
| 7648 | char b[BDEVNAME_SIZE]; |
| 7649 | i++; |
| 7650 | seq_printf(seq, "%s ", |
| 7651 | bdevname(rdev->bdev,b)); |
| 7652 | } |
| 7653 | if (!i) |
| 7654 | seq_printf(seq, "<none>"); |
| 7655 | |
| 7656 | seq_printf(seq, "\n"); |
| 7657 | } |
| 7658 | |
| 7659 | static int status_resync(struct seq_file *seq, struct mddev *mddev) |
| 7660 | { |
| 7661 | sector_t max_sectors, resync, res; |
| 7662 | unsigned long dt, db; |
| 7663 | sector_t rt; |
| 7664 | int scale; |
| 7665 | unsigned int per_milli; |
| 7666 | |
| 7667 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
| 7668 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 7669 | max_sectors = mddev->resync_max_sectors; |
| 7670 | else |
| 7671 | max_sectors = mddev->dev_sectors; |
| 7672 | |
| 7673 | resync = mddev->curr_resync; |
| 7674 | if (resync <= 3) { |
| 7675 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) |
| 7676 | /* Still cleaning up */ |
| 7677 | resync = max_sectors; |
| 7678 | } else if (resync > max_sectors) |
| 7679 | resync = max_sectors; |
| 7680 | else |
| 7681 | resync -= atomic_read(&mddev->recovery_active); |
| 7682 | |
| 7683 | if (resync == 0) { |
| 7684 | if (mddev->recovery_cp < MaxSector) { |
| 7685 | seq_printf(seq, "\tresync=PENDING"); |
| 7686 | return 1; |
| 7687 | } |
| 7688 | return 0; |
| 7689 | } |
| 7690 | if (resync < 3) { |
| 7691 | seq_printf(seq, "\tresync=DELAYED"); |
| 7692 | return 1; |
| 7693 | } |
| 7694 | |
| 7695 | WARN_ON(max_sectors == 0); |
| 7696 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
| 7697 | * in a sector_t, and (max_sectors>>scale) will fit in a |
| 7698 | * u32, as those are the requirements for sector_div. |
| 7699 | * Thus 'scale' must be at least 10 |
| 7700 | */ |
| 7701 | scale = 10; |
| 7702 | if (sizeof(sector_t) > sizeof(unsigned long)) { |
| 7703 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
| 7704 | scale++; |
| 7705 | } |
| 7706 | res = (resync>>scale)*1000; |
| 7707 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
| 7708 | |
| 7709 | per_milli = res; |
| 7710 | { |
| 7711 | int i, x = per_milli/50, y = 20-x; |
| 7712 | seq_printf(seq, "["); |
| 7713 | for (i = 0; i < x; i++) |
| 7714 | seq_printf(seq, "="); |
| 7715 | seq_printf(seq, ">"); |
| 7716 | for (i = 0; i < y; i++) |
| 7717 | seq_printf(seq, "."); |
| 7718 | seq_printf(seq, "] "); |
| 7719 | } |
| 7720 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
| 7721 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
| 7722 | "reshape" : |
| 7723 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
| 7724 | "check" : |
| 7725 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? |
| 7726 | "resync" : "recovery"))), |
| 7727 | per_milli/10, per_milli % 10, |
| 7728 | (unsigned long long) resync/2, |
| 7729 | (unsigned long long) max_sectors/2); |
| 7730 | |
| 7731 | /* |
| 7732 | * dt: time from mark until now |
| 7733 | * db: blocks written from mark until now |
| 7734 | * rt: remaining time |
| 7735 | * |
| 7736 | * rt is a sector_t, so could be 32bit or 64bit. |
| 7737 | * So we divide before multiply in case it is 32bit and close |
| 7738 | * to the limit. |
| 7739 | * We scale the divisor (db) by 32 to avoid losing precision |
| 7740 | * near the end of resync when the number of remaining sectors |
| 7741 | * is close to 'db'. |
| 7742 | * We then divide rt by 32 after multiplying by db to compensate. |
| 7743 | * The '+1' avoids division by zero if db is very small. |
| 7744 | */ |
| 7745 | dt = ((jiffies - mddev->resync_mark) / HZ); |
| 7746 | if (!dt) dt++; |
| 7747 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
| 7748 | - mddev->resync_mark_cnt; |
| 7749 | |
| 7750 | rt = max_sectors - resync; /* number of remaining sectors */ |
| 7751 | sector_div(rt, db/32+1); |
| 7752 | rt *= dt; |
| 7753 | rt >>= 5; |
| 7754 | |
| 7755 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, |
| 7756 | ((unsigned long)rt % 60)/6); |
| 7757 | |
| 7758 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
| 7759 | return 1; |
| 7760 | } |
| 7761 | |
| 7762 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) |
| 7763 | { |
| 7764 | struct list_head *tmp; |
| 7765 | loff_t l = *pos; |
| 7766 | struct mddev *mddev; |
| 7767 | |
| 7768 | if (l >= 0x10000) |
| 7769 | return NULL; |
| 7770 | if (!l--) |
| 7771 | /* header */ |
| 7772 | return (void*)1; |
| 7773 | |
| 7774 | spin_lock(&all_mddevs_lock); |
| 7775 | list_for_each(tmp,&all_mddevs) |
| 7776 | if (!l--) { |
| 7777 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
| 7778 | mddev_get(mddev); |
| 7779 | spin_unlock(&all_mddevs_lock); |
| 7780 | return mddev; |
| 7781 | } |
| 7782 | spin_unlock(&all_mddevs_lock); |
| 7783 | if (!l--) |
| 7784 | return (void*)2;/* tail */ |
| 7785 | return NULL; |
| 7786 | } |
| 7787 | |
| 7788 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 7789 | { |
| 7790 | struct list_head *tmp; |
| 7791 | struct mddev *next_mddev, *mddev = v; |
| 7792 | |
| 7793 | ++*pos; |
| 7794 | if (v == (void*)2) |
| 7795 | return NULL; |
| 7796 | |
| 7797 | spin_lock(&all_mddevs_lock); |
| 7798 | if (v == (void*)1) |
| 7799 | tmp = all_mddevs.next; |
| 7800 | else |
| 7801 | tmp = mddev->all_mddevs.next; |
| 7802 | if (tmp != &all_mddevs) |
| 7803 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
| 7804 | else { |
| 7805 | next_mddev = (void*)2; |
| 7806 | *pos = 0x10000; |
| 7807 | } |
| 7808 | spin_unlock(&all_mddevs_lock); |
| 7809 | |
| 7810 | if (v != (void*)1) |
| 7811 | mddev_put(mddev); |
| 7812 | return next_mddev; |
| 7813 | |
| 7814 | } |
| 7815 | |
| 7816 | static void md_seq_stop(struct seq_file *seq, void *v) |
| 7817 | { |
| 7818 | struct mddev *mddev = v; |
| 7819 | |
| 7820 | if (mddev && v != (void*)1 && v != (void*)2) |
| 7821 | mddev_put(mddev); |
| 7822 | } |
| 7823 | |
| 7824 | static int md_seq_show(struct seq_file *seq, void *v) |
| 7825 | { |
| 7826 | struct mddev *mddev = v; |
| 7827 | sector_t sectors; |
| 7828 | struct md_rdev *rdev; |
| 7829 | |
| 7830 | if (v == (void*)1) { |
| 7831 | struct md_personality *pers; |
| 7832 | seq_printf(seq, "Personalities : "); |
| 7833 | spin_lock(&pers_lock); |
| 7834 | list_for_each_entry(pers, &pers_list, list) |
| 7835 | seq_printf(seq, "[%s] ", pers->name); |
| 7836 | |
| 7837 | spin_unlock(&pers_lock); |
| 7838 | seq_printf(seq, "\n"); |
| 7839 | seq->poll_event = atomic_read(&md_event_count); |
| 7840 | return 0; |
| 7841 | } |
| 7842 | if (v == (void*)2) { |
| 7843 | status_unused(seq); |
| 7844 | return 0; |
| 7845 | } |
| 7846 | |
| 7847 | spin_lock(&mddev->lock); |
| 7848 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
| 7849 | seq_printf(seq, "%s : %sactive", mdname(mddev), |
| 7850 | mddev->pers ? "" : "in"); |
| 7851 | if (mddev->pers) { |
| 7852 | if (mddev->ro==1) |
| 7853 | seq_printf(seq, " (read-only)"); |
| 7854 | if (mddev->ro==2) |
| 7855 | seq_printf(seq, " (auto-read-only)"); |
| 7856 | seq_printf(seq, " %s", mddev->pers->name); |
| 7857 | } |
| 7858 | |
| 7859 | sectors = 0; |
| 7860 | rcu_read_lock(); |
| 7861 | rdev_for_each_rcu(rdev, mddev) { |
| 7862 | char b[BDEVNAME_SIZE]; |
| 7863 | seq_printf(seq, " %s[%d]", |
| 7864 | bdevname(rdev->bdev,b), rdev->desc_nr); |
| 7865 | if (test_bit(WriteMostly, &rdev->flags)) |
| 7866 | seq_printf(seq, "(W)"); |
| 7867 | if (test_bit(Journal, &rdev->flags)) |
| 7868 | seq_printf(seq, "(J)"); |
| 7869 | if (test_bit(Faulty, &rdev->flags)) { |
| 7870 | seq_printf(seq, "(F)"); |
| 7871 | continue; |
| 7872 | } |
| 7873 | if (rdev->raid_disk < 0) |
| 7874 | seq_printf(seq, "(S)"); /* spare */ |
| 7875 | if (test_bit(Replacement, &rdev->flags)) |
| 7876 | seq_printf(seq, "(R)"); |
| 7877 | sectors += rdev->sectors; |
| 7878 | } |
| 7879 | rcu_read_unlock(); |
| 7880 | |
| 7881 | if (!list_empty(&mddev->disks)) { |
| 7882 | if (mddev->pers) |
| 7883 | seq_printf(seq, "\n %llu blocks", |
| 7884 | (unsigned long long) |
| 7885 | mddev->array_sectors / 2); |
| 7886 | else |
| 7887 | seq_printf(seq, "\n %llu blocks", |
| 7888 | (unsigned long long)sectors / 2); |
| 7889 | } |
| 7890 | if (mddev->persistent) { |
| 7891 | if (mddev->major_version != 0 || |
| 7892 | mddev->minor_version != 90) { |
| 7893 | seq_printf(seq," super %d.%d", |
| 7894 | mddev->major_version, |
| 7895 | mddev->minor_version); |
| 7896 | } |
| 7897 | } else if (mddev->external) |
| 7898 | seq_printf(seq, " super external:%s", |
| 7899 | mddev->metadata_type); |
| 7900 | else |
| 7901 | seq_printf(seq, " super non-persistent"); |
| 7902 | |
| 7903 | if (mddev->pers) { |
| 7904 | mddev->pers->status(seq, mddev); |
| 7905 | seq_printf(seq, "\n "); |
| 7906 | if (mddev->pers->sync_request) { |
| 7907 | if (status_resync(seq, mddev)) |
| 7908 | seq_printf(seq, "\n "); |
| 7909 | } |
| 7910 | } else |
| 7911 | seq_printf(seq, "\n "); |
| 7912 | |
| 7913 | bitmap_status(seq, mddev->bitmap); |
| 7914 | |
| 7915 | seq_printf(seq, "\n"); |
| 7916 | } |
| 7917 | spin_unlock(&mddev->lock); |
| 7918 | |
| 7919 | return 0; |
| 7920 | } |
| 7921 | |
| 7922 | static const struct seq_operations md_seq_ops = { |
| 7923 | .start = md_seq_start, |
| 7924 | .next = md_seq_next, |
| 7925 | .stop = md_seq_stop, |
| 7926 | .show = md_seq_show, |
| 7927 | }; |
| 7928 | |
| 7929 | static int md_seq_open(struct inode *inode, struct file *file) |
| 7930 | { |
| 7931 | struct seq_file *seq; |
| 7932 | int error; |
| 7933 | |
| 7934 | error = seq_open(file, &md_seq_ops); |
| 7935 | if (error) |
| 7936 | return error; |
| 7937 | |
| 7938 | seq = file->private_data; |
| 7939 | seq->poll_event = atomic_read(&md_event_count); |
| 7940 | return error; |
| 7941 | } |
| 7942 | |
| 7943 | static int md_unloading; |
| 7944 | static __poll_t mdstat_poll(struct file *filp, poll_table *wait) |
| 7945 | { |
| 7946 | struct seq_file *seq = filp->private_data; |
| 7947 | __poll_t mask; |
| 7948 | |
| 7949 | if (md_unloading) |
| 7950 | return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI; |
| 7951 | poll_wait(filp, &md_event_waiters, wait); |
| 7952 | |
| 7953 | /* always allow read */ |
| 7954 | mask = EPOLLIN | EPOLLRDNORM; |
| 7955 | |
| 7956 | if (seq->poll_event != atomic_read(&md_event_count)) |
| 7957 | mask |= EPOLLERR | EPOLLPRI; |
| 7958 | return mask; |
| 7959 | } |
| 7960 | |
| 7961 | static const struct file_operations md_seq_fops = { |
| 7962 | .owner = THIS_MODULE, |
| 7963 | .open = md_seq_open, |
| 7964 | .read = seq_read, |
| 7965 | .llseek = seq_lseek, |
| 7966 | .release = seq_release, |
| 7967 | .poll = mdstat_poll, |
| 7968 | }; |
| 7969 | |
| 7970 | int register_md_personality(struct md_personality *p) |
| 7971 | { |
| 7972 | pr_debug("md: %s personality registered for level %d\n", |
| 7973 | p->name, p->level); |
| 7974 | spin_lock(&pers_lock); |
| 7975 | list_add_tail(&p->list, &pers_list); |
| 7976 | spin_unlock(&pers_lock); |
| 7977 | return 0; |
| 7978 | } |
| 7979 | EXPORT_SYMBOL(register_md_personality); |
| 7980 | |
| 7981 | int unregister_md_personality(struct md_personality *p) |
| 7982 | { |
| 7983 | pr_debug("md: %s personality unregistered\n", p->name); |
| 7984 | spin_lock(&pers_lock); |
| 7985 | list_del_init(&p->list); |
| 7986 | spin_unlock(&pers_lock); |
| 7987 | return 0; |
| 7988 | } |
| 7989 | EXPORT_SYMBOL(unregister_md_personality); |
| 7990 | |
| 7991 | int register_md_cluster_operations(struct md_cluster_operations *ops, |
| 7992 | struct module *module) |
| 7993 | { |
| 7994 | int ret = 0; |
| 7995 | spin_lock(&pers_lock); |
| 7996 | if (md_cluster_ops != NULL) |
| 7997 | ret = -EALREADY; |
| 7998 | else { |
| 7999 | md_cluster_ops = ops; |
| 8000 | md_cluster_mod = module; |
| 8001 | } |
| 8002 | spin_unlock(&pers_lock); |
| 8003 | return ret; |
| 8004 | } |
| 8005 | EXPORT_SYMBOL(register_md_cluster_operations); |
| 8006 | |
| 8007 | int unregister_md_cluster_operations(void) |
| 8008 | { |
| 8009 | spin_lock(&pers_lock); |
| 8010 | md_cluster_ops = NULL; |
| 8011 | spin_unlock(&pers_lock); |
| 8012 | return 0; |
| 8013 | } |
| 8014 | EXPORT_SYMBOL(unregister_md_cluster_operations); |
| 8015 | |
| 8016 | int md_setup_cluster(struct mddev *mddev, int nodes) |
| 8017 | { |
| 8018 | if (!md_cluster_ops) |
| 8019 | request_module("md-cluster"); |
| 8020 | spin_lock(&pers_lock); |
| 8021 | /* ensure module won't be unloaded */ |
| 8022 | if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { |
| 8023 | pr_warn("can't find md-cluster module or get it's reference.\n"); |
| 8024 | spin_unlock(&pers_lock); |
| 8025 | return -ENOENT; |
| 8026 | } |
| 8027 | spin_unlock(&pers_lock); |
| 8028 | |
| 8029 | return md_cluster_ops->join(mddev, nodes); |
| 8030 | } |
| 8031 | |
| 8032 | void md_cluster_stop(struct mddev *mddev) |
| 8033 | { |
| 8034 | if (!md_cluster_ops) |
| 8035 | return; |
| 8036 | md_cluster_ops->leave(mddev); |
| 8037 | module_put(md_cluster_mod); |
| 8038 | } |
| 8039 | |
| 8040 | static int is_mddev_idle(struct mddev *mddev, int init) |
| 8041 | { |
| 8042 | struct md_rdev *rdev; |
| 8043 | int idle; |
| 8044 | int curr_events; |
| 8045 | |
| 8046 | idle = 1; |
| 8047 | rcu_read_lock(); |
| 8048 | rdev_for_each_rcu(rdev, mddev) { |
| 8049 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
| 8050 | curr_events = (int)part_stat_read_accum(&disk->part0, sectors) - |
| 8051 | atomic_read(&disk->sync_io); |
| 8052 | /* sync IO will cause sync_io to increase before the disk_stats |
| 8053 | * as sync_io is counted when a request starts, and |
| 8054 | * disk_stats is counted when it completes. |
| 8055 | * So resync activity will cause curr_events to be smaller than |
| 8056 | * when there was no such activity. |
| 8057 | * non-sync IO will cause disk_stat to increase without |
| 8058 | * increasing sync_io so curr_events will (eventually) |
| 8059 | * be larger than it was before. Once it becomes |
| 8060 | * substantially larger, the test below will cause |
| 8061 | * the array to appear non-idle, and resync will slow |
| 8062 | * down. |
| 8063 | * If there is a lot of outstanding resync activity when |
| 8064 | * we set last_event to curr_events, then all that activity |
| 8065 | * completing might cause the array to appear non-idle |
| 8066 | * and resync will be slowed down even though there might |
| 8067 | * not have been non-resync activity. This will only |
| 8068 | * happen once though. 'last_events' will soon reflect |
| 8069 | * the state where there is little or no outstanding |
| 8070 | * resync requests, and further resync activity will |
| 8071 | * always make curr_events less than last_events. |
| 8072 | * |
| 8073 | */ |
| 8074 | if (init || curr_events - rdev->last_events > 64) { |
| 8075 | rdev->last_events = curr_events; |
| 8076 | idle = 0; |
| 8077 | } |
| 8078 | } |
| 8079 | rcu_read_unlock(); |
| 8080 | return idle; |
| 8081 | } |
| 8082 | |
| 8083 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
| 8084 | { |
| 8085 | /* another "blocks" (512byte) blocks have been synced */ |
| 8086 | atomic_sub(blocks, &mddev->recovery_active); |
| 8087 | wake_up(&mddev->recovery_wait); |
| 8088 | if (!ok) { |
| 8089 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 8090 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
| 8091 | md_wakeup_thread(mddev->thread); |
| 8092 | // stop recovery, signal do_sync .... |
| 8093 | } |
| 8094 | } |
| 8095 | EXPORT_SYMBOL(md_done_sync); |
| 8096 | |
| 8097 | /* md_write_start(mddev, bi) |
| 8098 | * If we need to update some array metadata (e.g. 'active' flag |
| 8099 | * in superblock) before writing, schedule a superblock update |
| 8100 | * and wait for it to complete. |
| 8101 | * A return value of 'false' means that the write wasn't recorded |
| 8102 | * and cannot proceed as the array is being suspend. |
| 8103 | */ |
| 8104 | bool md_write_start(struct mddev *mddev, struct bio *bi) |
| 8105 | { |
| 8106 | int did_change = 0; |
| 8107 | |
| 8108 | if (bio_data_dir(bi) != WRITE) |
| 8109 | return true; |
| 8110 | |
| 8111 | BUG_ON(mddev->ro == 1); |
| 8112 | if (mddev->ro == 2) { |
| 8113 | /* need to switch to read/write */ |
| 8114 | mddev->ro = 0; |
| 8115 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 8116 | md_wakeup_thread(mddev->thread); |
| 8117 | md_wakeup_thread(mddev->sync_thread); |
| 8118 | did_change = 1; |
| 8119 | } |
| 8120 | rcu_read_lock(); |
| 8121 | percpu_ref_get(&mddev->writes_pending); |
| 8122 | smp_mb(); /* Match smp_mb in set_in_sync() */ |
| 8123 | if (mddev->safemode == 1) |
| 8124 | mddev->safemode = 0; |
| 8125 | /* sync_checkers is always 0 when writes_pending is in per-cpu mode */ |
| 8126 | if (mddev->in_sync || mddev->sync_checkers) { |
| 8127 | spin_lock(&mddev->lock); |
| 8128 | if (mddev->in_sync) { |
| 8129 | mddev->in_sync = 0; |
| 8130 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
| 8131 | set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
| 8132 | md_wakeup_thread(mddev->thread); |
| 8133 | did_change = 1; |
| 8134 | } |
| 8135 | spin_unlock(&mddev->lock); |
| 8136 | } |
| 8137 | rcu_read_unlock(); |
| 8138 | if (did_change) |
| 8139 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 8140 | if (!mddev->has_superblocks) |
| 8141 | return true; |
| 8142 | wait_event(mddev->sb_wait, |
| 8143 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) || |
| 8144 | mddev->suspended); |
| 8145 | if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
| 8146 | percpu_ref_put(&mddev->writes_pending); |
| 8147 | return false; |
| 8148 | } |
| 8149 | return true; |
| 8150 | } |
| 8151 | EXPORT_SYMBOL(md_write_start); |
| 8152 | |
| 8153 | /* md_write_inc can only be called when md_write_start() has |
| 8154 | * already been called at least once of the current request. |
| 8155 | * It increments the counter and is useful when a single request |
| 8156 | * is split into several parts. Each part causes an increment and |
| 8157 | * so needs a matching md_write_end(). |
| 8158 | * Unlike md_write_start(), it is safe to call md_write_inc() inside |
| 8159 | * a spinlocked region. |
| 8160 | */ |
| 8161 | void md_write_inc(struct mddev *mddev, struct bio *bi) |
| 8162 | { |
| 8163 | if (bio_data_dir(bi) != WRITE) |
| 8164 | return; |
| 8165 | WARN_ON_ONCE(mddev->in_sync || mddev->ro); |
| 8166 | percpu_ref_get(&mddev->writes_pending); |
| 8167 | } |
| 8168 | EXPORT_SYMBOL(md_write_inc); |
| 8169 | |
| 8170 | void md_write_end(struct mddev *mddev) |
| 8171 | { |
| 8172 | percpu_ref_put(&mddev->writes_pending); |
| 8173 | |
| 8174 | if (mddev->safemode == 2) |
| 8175 | md_wakeup_thread(mddev->thread); |
| 8176 | else if (mddev->safemode_delay) |
| 8177 | /* The roundup() ensures this only performs locking once |
| 8178 | * every ->safemode_delay jiffies |
| 8179 | */ |
| 8180 | mod_timer(&mddev->safemode_timer, |
| 8181 | roundup(jiffies, mddev->safemode_delay) + |
| 8182 | mddev->safemode_delay); |
| 8183 | } |
| 8184 | |
| 8185 | EXPORT_SYMBOL(md_write_end); |
| 8186 | |
| 8187 | /* md_allow_write(mddev) |
| 8188 | * Calling this ensures that the array is marked 'active' so that writes |
| 8189 | * may proceed without blocking. It is important to call this before |
| 8190 | * attempting a GFP_KERNEL allocation while holding the mddev lock. |
| 8191 | * Must be called with mddev_lock held. |
| 8192 | */ |
| 8193 | void md_allow_write(struct mddev *mddev) |
| 8194 | { |
| 8195 | if (!mddev->pers) |
| 8196 | return; |
| 8197 | if (mddev->ro) |
| 8198 | return; |
| 8199 | if (!mddev->pers->sync_request) |
| 8200 | return; |
| 8201 | |
| 8202 | spin_lock(&mddev->lock); |
| 8203 | if (mddev->in_sync) { |
| 8204 | mddev->in_sync = 0; |
| 8205 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
| 8206 | set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
| 8207 | if (mddev->safemode_delay && |
| 8208 | mddev->safemode == 0) |
| 8209 | mddev->safemode = 1; |
| 8210 | spin_unlock(&mddev->lock); |
| 8211 | md_update_sb(mddev, 0); |
| 8212 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
| 8213 | /* wait for the dirty state to be recorded in the metadata */ |
| 8214 | wait_event(mddev->sb_wait, |
| 8215 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); |
| 8216 | } else |
| 8217 | spin_unlock(&mddev->lock); |
| 8218 | } |
| 8219 | EXPORT_SYMBOL_GPL(md_allow_write); |
| 8220 | |
| 8221 | #define SYNC_MARKS 10 |
| 8222 | #define SYNC_MARK_STEP (3*HZ) |
| 8223 | #define UPDATE_FREQUENCY (5*60*HZ) |
| 8224 | void md_do_sync(struct md_thread *thread) |
| 8225 | { |
| 8226 | struct mddev *mddev = thread->mddev; |
| 8227 | struct mddev *mddev2; |
| 8228 | unsigned int currspeed = 0, |
| 8229 | window; |
| 8230 | sector_t max_sectors,j, io_sectors, recovery_done; |
| 8231 | unsigned long mark[SYNC_MARKS]; |
| 8232 | unsigned long update_time; |
| 8233 | sector_t mark_cnt[SYNC_MARKS]; |
| 8234 | int last_mark,m; |
| 8235 | struct list_head *tmp; |
| 8236 | sector_t last_check; |
| 8237 | int skipped = 0; |
| 8238 | struct md_rdev *rdev; |
| 8239 | char *desc, *action = NULL; |
| 8240 | struct blk_plug plug; |
| 8241 | int ret; |
| 8242 | |
| 8243 | /* just incase thread restarts... */ |
| 8244 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
| 8245 | test_bit(MD_RECOVERY_WAIT, &mddev->recovery)) |
| 8246 | return; |
| 8247 | if (mddev->ro) {/* never try to sync a read-only array */ |
| 8248 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 8249 | return; |
| 8250 | } |
| 8251 | |
| 8252 | if (mddev_is_clustered(mddev)) { |
| 8253 | ret = md_cluster_ops->resync_start(mddev); |
| 8254 | if (ret) |
| 8255 | goto skip; |
| 8256 | |
| 8257 | set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags); |
| 8258 | if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
| 8259 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || |
| 8260 | test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
| 8261 | && ((unsigned long long)mddev->curr_resync_completed |
| 8262 | < (unsigned long long)mddev->resync_max_sectors)) |
| 8263 | goto skip; |
| 8264 | } |
| 8265 | |
| 8266 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| 8267 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
| 8268 | desc = "data-check"; |
| 8269 | action = "check"; |
| 8270 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
| 8271 | desc = "requested-resync"; |
| 8272 | action = "repair"; |
| 8273 | } else |
| 8274 | desc = "resync"; |
| 8275 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 8276 | desc = "reshape"; |
| 8277 | else |
| 8278 | desc = "recovery"; |
| 8279 | |
| 8280 | mddev->last_sync_action = action ?: desc; |
| 8281 | |
| 8282 | /* we overload curr_resync somewhat here. |
| 8283 | * 0 == not engaged in resync at all |
| 8284 | * 2 == checking that there is no conflict with another sync |
| 8285 | * 1 == like 2, but have yielded to allow conflicting resync to |
| 8286 | * commense |
| 8287 | * other == active in resync - this many blocks |
| 8288 | * |
| 8289 | * Before starting a resync we must have set curr_resync to |
| 8290 | * 2, and then checked that every "conflicting" array has curr_resync |
| 8291 | * less than ours. When we find one that is the same or higher |
| 8292 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync |
| 8293 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). |
| 8294 | * This will mean we have to start checking from the beginning again. |
| 8295 | * |
| 8296 | */ |
| 8297 | |
| 8298 | do { |
| 8299 | int mddev2_minor = -1; |
| 8300 | mddev->curr_resync = 2; |
| 8301 | |
| 8302 | try_again: |
| 8303 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| 8304 | goto skip; |
| 8305 | for_each_mddev(mddev2, tmp) { |
| 8306 | if (mddev2 == mddev) |
| 8307 | continue; |
| 8308 | if (!mddev->parallel_resync |
| 8309 | && mddev2->curr_resync |
| 8310 | && match_mddev_units(mddev, mddev2)) { |
| 8311 | DEFINE_WAIT(wq); |
| 8312 | if (mddev < mddev2 && mddev->curr_resync == 2) { |
| 8313 | /* arbitrarily yield */ |
| 8314 | mddev->curr_resync = 1; |
| 8315 | wake_up(&resync_wait); |
| 8316 | } |
| 8317 | if (mddev > mddev2 && mddev->curr_resync == 1) |
| 8318 | /* no need to wait here, we can wait the next |
| 8319 | * time 'round when curr_resync == 2 |
| 8320 | */ |
| 8321 | continue; |
| 8322 | /* We need to wait 'interruptible' so as not to |
| 8323 | * contribute to the load average, and not to |
| 8324 | * be caught by 'softlockup' |
| 8325 | */ |
| 8326 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); |
| 8327 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
| 8328 | mddev2->curr_resync >= mddev->curr_resync) { |
| 8329 | if (mddev2_minor != mddev2->md_minor) { |
| 8330 | mddev2_minor = mddev2->md_minor; |
| 8331 | pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n", |
| 8332 | desc, mdname(mddev), |
| 8333 | mdname(mddev2)); |
| 8334 | } |
| 8335 | mddev_put(mddev2); |
| 8336 | if (signal_pending(current)) |
| 8337 | flush_signals(current); |
| 8338 | schedule(); |
| 8339 | finish_wait(&resync_wait, &wq); |
| 8340 | goto try_again; |
| 8341 | } |
| 8342 | finish_wait(&resync_wait, &wq); |
| 8343 | } |
| 8344 | } |
| 8345 | } while (mddev->curr_resync < 2); |
| 8346 | |
| 8347 | j = 0; |
| 8348 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| 8349 | /* resync follows the size requested by the personality, |
| 8350 | * which defaults to physical size, but can be virtual size |
| 8351 | */ |
| 8352 | max_sectors = mddev->resync_max_sectors; |
| 8353 | atomic64_set(&mddev->resync_mismatches, 0); |
| 8354 | /* we don't use the checkpoint if there's a bitmap */ |
| 8355 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| 8356 | j = mddev->resync_min; |
| 8357 | else if (!mddev->bitmap) |
| 8358 | j = mddev->recovery_cp; |
| 8359 | |
| 8360 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 8361 | max_sectors = mddev->resync_max_sectors; |
| 8362 | else { |
| 8363 | /* recovery follows the physical size of devices */ |
| 8364 | max_sectors = mddev->dev_sectors; |
| 8365 | j = MaxSector; |
| 8366 | rcu_read_lock(); |
| 8367 | rdev_for_each_rcu(rdev, mddev) |
| 8368 | if (rdev->raid_disk >= 0 && |
| 8369 | !test_bit(Journal, &rdev->flags) && |
| 8370 | !test_bit(Faulty, &rdev->flags) && |
| 8371 | !test_bit(In_sync, &rdev->flags) && |
| 8372 | rdev->recovery_offset < j) |
| 8373 | j = rdev->recovery_offset; |
| 8374 | rcu_read_unlock(); |
| 8375 | |
| 8376 | /* If there is a bitmap, we need to make sure all |
| 8377 | * writes that started before we added a spare |
| 8378 | * complete before we start doing a recovery. |
| 8379 | * Otherwise the write might complete and (via |
| 8380 | * bitmap_endwrite) set a bit in the bitmap after the |
| 8381 | * recovery has checked that bit and skipped that |
| 8382 | * region. |
| 8383 | */ |
| 8384 | if (mddev->bitmap) { |
| 8385 | mddev->pers->quiesce(mddev, 1); |
| 8386 | mddev->pers->quiesce(mddev, 0); |
| 8387 | } |
| 8388 | } |
| 8389 | |
| 8390 | pr_info("md: %s of RAID array %s\n", desc, mdname(mddev)); |
| 8391 | pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev)); |
| 8392 | pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n", |
| 8393 | speed_max(mddev), desc); |
| 8394 | |
| 8395 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
| 8396 | |
| 8397 | io_sectors = 0; |
| 8398 | for (m = 0; m < SYNC_MARKS; m++) { |
| 8399 | mark[m] = jiffies; |
| 8400 | mark_cnt[m] = io_sectors; |
| 8401 | } |
| 8402 | last_mark = 0; |
| 8403 | mddev->resync_mark = mark[last_mark]; |
| 8404 | mddev->resync_mark_cnt = mark_cnt[last_mark]; |
| 8405 | |
| 8406 | /* |
| 8407 | * Tune reconstruction: |
| 8408 | */ |
| 8409 | window = 32*(PAGE_SIZE/512); |
| 8410 | pr_debug("md: using %dk window, over a total of %lluk.\n", |
| 8411 | window/2, (unsigned long long)max_sectors/2); |
| 8412 | |
| 8413 | atomic_set(&mddev->recovery_active, 0); |
| 8414 | last_check = 0; |
| 8415 | |
| 8416 | if (j>2) { |
| 8417 | pr_debug("md: resuming %s of %s from checkpoint.\n", |
| 8418 | desc, mdname(mddev)); |
| 8419 | mddev->curr_resync = j; |
| 8420 | } else |
| 8421 | mddev->curr_resync = 3; /* no longer delayed */ |
| 8422 | mddev->curr_resync_completed = j; |
| 8423 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| 8424 | md_new_event(mddev); |
| 8425 | update_time = jiffies; |
| 8426 | |
| 8427 | blk_start_plug(&plug); |
| 8428 | while (j < max_sectors) { |
| 8429 | sector_t sectors; |
| 8430 | |
| 8431 | skipped = 0; |
| 8432 | |
| 8433 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| 8434 | ((mddev->curr_resync > mddev->curr_resync_completed && |
| 8435 | (mddev->curr_resync - mddev->curr_resync_completed) |
| 8436 | > (max_sectors >> 4)) || |
| 8437 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
| 8438 | (j - mddev->curr_resync_completed)*2 |
| 8439 | >= mddev->resync_max - mddev->curr_resync_completed || |
| 8440 | mddev->curr_resync_completed > mddev->resync_max |
| 8441 | )) { |
| 8442 | /* time to update curr_resync_completed */ |
| 8443 | wait_event(mddev->recovery_wait, |
| 8444 | atomic_read(&mddev->recovery_active) == 0); |
| 8445 | mddev->curr_resync_completed = j; |
| 8446 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
| 8447 | j > mddev->recovery_cp) |
| 8448 | mddev->recovery_cp = j; |
| 8449 | update_time = jiffies; |
| 8450 | set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); |
| 8451 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| 8452 | } |
| 8453 | |
| 8454 | while (j >= mddev->resync_max && |
| 8455 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
| 8456 | /* As this condition is controlled by user-space, |
| 8457 | * we can block indefinitely, so use '_interruptible' |
| 8458 | * to avoid triggering warnings. |
| 8459 | */ |
| 8460 | flush_signals(current); /* just in case */ |
| 8461 | wait_event_interruptible(mddev->recovery_wait, |
| 8462 | mddev->resync_max > j |
| 8463 | || test_bit(MD_RECOVERY_INTR, |
| 8464 | &mddev->recovery)); |
| 8465 | } |
| 8466 | |
| 8467 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| 8468 | break; |
| 8469 | |
| 8470 | sectors = mddev->pers->sync_request(mddev, j, &skipped); |
| 8471 | if (sectors == 0) { |
| 8472 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 8473 | break; |
| 8474 | } |
| 8475 | |
| 8476 | if (!skipped) { /* actual IO requested */ |
| 8477 | io_sectors += sectors; |
| 8478 | atomic_add(sectors, &mddev->recovery_active); |
| 8479 | } |
| 8480 | |
| 8481 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| 8482 | break; |
| 8483 | |
| 8484 | j += sectors; |
| 8485 | if (j > max_sectors) |
| 8486 | /* when skipping, extra large numbers can be returned. */ |
| 8487 | j = max_sectors; |
| 8488 | if (j > 2) |
| 8489 | mddev->curr_resync = j; |
| 8490 | mddev->curr_mark_cnt = io_sectors; |
| 8491 | if (last_check == 0) |
| 8492 | /* this is the earliest that rebuild will be |
| 8493 | * visible in /proc/mdstat |
| 8494 | */ |
| 8495 | md_new_event(mddev); |
| 8496 | |
| 8497 | if (last_check + window > io_sectors || j == max_sectors) |
| 8498 | continue; |
| 8499 | |
| 8500 | last_check = io_sectors; |
| 8501 | repeat: |
| 8502 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { |
| 8503 | /* step marks */ |
| 8504 | int next = (last_mark+1) % SYNC_MARKS; |
| 8505 | |
| 8506 | mddev->resync_mark = mark[next]; |
| 8507 | mddev->resync_mark_cnt = mark_cnt[next]; |
| 8508 | mark[next] = jiffies; |
| 8509 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
| 8510 | last_mark = next; |
| 8511 | } |
| 8512 | |
| 8513 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| 8514 | break; |
| 8515 | |
| 8516 | /* |
| 8517 | * this loop exits only if either when we are slower than |
| 8518 | * the 'hard' speed limit, or the system was IO-idle for |
| 8519 | * a jiffy. |
| 8520 | * the system might be non-idle CPU-wise, but we only care |
| 8521 | * about not overloading the IO subsystem. (things like an |
| 8522 | * e2fsck being done on the RAID array should execute fast) |
| 8523 | */ |
| 8524 | cond_resched(); |
| 8525 | |
| 8526 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
| 8527 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 |
| 8528 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
| 8529 | |
| 8530 | if (currspeed > speed_min(mddev)) { |
| 8531 | if (currspeed > speed_max(mddev)) { |
| 8532 | msleep(500); |
| 8533 | goto repeat; |
| 8534 | } |
| 8535 | if (!is_mddev_idle(mddev, 0)) { |
| 8536 | /* |
| 8537 | * Give other IO more of a chance. |
| 8538 | * The faster the devices, the less we wait. |
| 8539 | */ |
| 8540 | wait_event(mddev->recovery_wait, |
| 8541 | !atomic_read(&mddev->recovery_active)); |
| 8542 | } |
| 8543 | } |
| 8544 | } |
| 8545 | pr_info("md: %s: %s %s.\n",mdname(mddev), desc, |
| 8546 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) |
| 8547 | ? "interrupted" : "done"); |
| 8548 | /* |
| 8549 | * this also signals 'finished resyncing' to md_stop |
| 8550 | */ |
| 8551 | blk_finish_plug(&plug); |
| 8552 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
| 8553 | |
| 8554 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| 8555 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
| 8556 | mddev->curr_resync > 3) { |
| 8557 | mddev->curr_resync_completed = mddev->curr_resync; |
| 8558 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| 8559 | } |
| 8560 | mddev->pers->sync_request(mddev, max_sectors, &skipped); |
| 8561 | |
| 8562 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
| 8563 | mddev->curr_resync > 3) { |
| 8564 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| 8565 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
| 8566 | if (mddev->curr_resync >= mddev->recovery_cp) { |
| 8567 | pr_debug("md: checkpointing %s of %s.\n", |
| 8568 | desc, mdname(mddev)); |
| 8569 | if (test_bit(MD_RECOVERY_ERROR, |
| 8570 | &mddev->recovery)) |
| 8571 | mddev->recovery_cp = |
| 8572 | mddev->curr_resync_completed; |
| 8573 | else |
| 8574 | mddev->recovery_cp = |
| 8575 | mddev->curr_resync; |
| 8576 | } |
| 8577 | } else |
| 8578 | mddev->recovery_cp = MaxSector; |
| 8579 | } else { |
| 8580 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| 8581 | mddev->curr_resync = MaxSector; |
| 8582 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| 8583 | test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) { |
| 8584 | rcu_read_lock(); |
| 8585 | rdev_for_each_rcu(rdev, mddev) |
| 8586 | if (rdev->raid_disk >= 0 && |
| 8587 | mddev->delta_disks >= 0 && |
| 8588 | !test_bit(Journal, &rdev->flags) && |
| 8589 | !test_bit(Faulty, &rdev->flags) && |
| 8590 | !test_bit(In_sync, &rdev->flags) && |
| 8591 | rdev->recovery_offset < mddev->curr_resync) |
| 8592 | rdev->recovery_offset = mddev->curr_resync; |
| 8593 | rcu_read_unlock(); |
| 8594 | } |
| 8595 | } |
| 8596 | } |
| 8597 | skip: |
| 8598 | /* set CHANGE_PENDING here since maybe another update is needed, |
| 8599 | * so other nodes are informed. It should be harmless for normal |
| 8600 | * raid */ |
| 8601 | set_mask_bits(&mddev->sb_flags, 0, |
| 8602 | BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS)); |
| 8603 | |
| 8604 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| 8605 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
| 8606 | mddev->delta_disks > 0 && |
| 8607 | mddev->pers->finish_reshape && |
| 8608 | mddev->pers->size && |
| 8609 | mddev->queue) { |
| 8610 | mddev_lock_nointr(mddev); |
| 8611 | md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0)); |
| 8612 | mddev_unlock(mddev); |
| 8613 | set_capacity(mddev->gendisk, mddev->array_sectors); |
| 8614 | revalidate_disk(mddev->gendisk); |
| 8615 | } |
| 8616 | |
| 8617 | spin_lock(&mddev->lock); |
| 8618 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
| 8619 | /* We completed so min/max setting can be forgotten if used. */ |
| 8620 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| 8621 | mddev->resync_min = 0; |
| 8622 | mddev->resync_max = MaxSector; |
| 8623 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| 8624 | mddev->resync_min = mddev->curr_resync_completed; |
| 8625 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); |
| 8626 | mddev->curr_resync = 0; |
| 8627 | spin_unlock(&mddev->lock); |
| 8628 | |
| 8629 | wake_up(&resync_wait); |
| 8630 | md_wakeup_thread(mddev->thread); |
| 8631 | return; |
| 8632 | } |
| 8633 | EXPORT_SYMBOL_GPL(md_do_sync); |
| 8634 | |
| 8635 | static int remove_and_add_spares(struct mddev *mddev, |
| 8636 | struct md_rdev *this) |
| 8637 | { |
| 8638 | struct md_rdev *rdev; |
| 8639 | int spares = 0; |
| 8640 | int removed = 0; |
| 8641 | bool remove_some = false; |
| 8642 | |
| 8643 | if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 8644 | /* Mustn't remove devices when resync thread is running */ |
| 8645 | return 0; |
| 8646 | |
| 8647 | rdev_for_each(rdev, mddev) { |
| 8648 | if ((this == NULL || rdev == this) && |
| 8649 | rdev->raid_disk >= 0 && |
| 8650 | !test_bit(Blocked, &rdev->flags) && |
| 8651 | test_bit(Faulty, &rdev->flags) && |
| 8652 | atomic_read(&rdev->nr_pending)==0) { |
| 8653 | /* Faulty non-Blocked devices with nr_pending == 0 |
| 8654 | * never get nr_pending incremented, |
| 8655 | * never get Faulty cleared, and never get Blocked set. |
| 8656 | * So we can synchronize_rcu now rather than once per device |
| 8657 | */ |
| 8658 | remove_some = true; |
| 8659 | set_bit(RemoveSynchronized, &rdev->flags); |
| 8660 | } |
| 8661 | } |
| 8662 | |
| 8663 | if (remove_some) |
| 8664 | synchronize_rcu(); |
| 8665 | rdev_for_each(rdev, mddev) { |
| 8666 | if ((this == NULL || rdev == this) && |
| 8667 | rdev->raid_disk >= 0 && |
| 8668 | !test_bit(Blocked, &rdev->flags) && |
| 8669 | ((test_bit(RemoveSynchronized, &rdev->flags) || |
| 8670 | (!test_bit(In_sync, &rdev->flags) && |
| 8671 | !test_bit(Journal, &rdev->flags))) && |
| 8672 | atomic_read(&rdev->nr_pending)==0)) { |
| 8673 | if (mddev->pers->hot_remove_disk( |
| 8674 | mddev, rdev) == 0) { |
| 8675 | sysfs_unlink_rdev(mddev, rdev); |
| 8676 | rdev->saved_raid_disk = rdev->raid_disk; |
| 8677 | rdev->raid_disk = -1; |
| 8678 | removed++; |
| 8679 | } |
| 8680 | } |
| 8681 | if (remove_some && test_bit(RemoveSynchronized, &rdev->flags)) |
| 8682 | clear_bit(RemoveSynchronized, &rdev->flags); |
| 8683 | } |
| 8684 | |
| 8685 | if (removed && mddev->kobj.sd) |
| 8686 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| 8687 | |
| 8688 | if (this && removed) |
| 8689 | goto no_add; |
| 8690 | |
| 8691 | rdev_for_each(rdev, mddev) { |
| 8692 | if (this && this != rdev) |
| 8693 | continue; |
| 8694 | if (test_bit(Candidate, &rdev->flags)) |
| 8695 | continue; |
| 8696 | if (rdev->raid_disk >= 0 && |
| 8697 | !test_bit(In_sync, &rdev->flags) && |
| 8698 | !test_bit(Journal, &rdev->flags) && |
| 8699 | !test_bit(Faulty, &rdev->flags)) |
| 8700 | spares++; |
| 8701 | if (rdev->raid_disk >= 0) |
| 8702 | continue; |
| 8703 | if (test_bit(Faulty, &rdev->flags)) |
| 8704 | continue; |
| 8705 | if (!test_bit(Journal, &rdev->flags)) { |
| 8706 | if (mddev->ro && |
| 8707 | ! (rdev->saved_raid_disk >= 0 && |
| 8708 | !test_bit(Bitmap_sync, &rdev->flags))) |
| 8709 | continue; |
| 8710 | |
| 8711 | rdev->recovery_offset = 0; |
| 8712 | } |
| 8713 | if (mddev->pers-> |
| 8714 | hot_add_disk(mddev, rdev) == 0) { |
| 8715 | if (sysfs_link_rdev(mddev, rdev)) |
| 8716 | /* failure here is OK */; |
| 8717 | if (!test_bit(Journal, &rdev->flags)) |
| 8718 | spares++; |
| 8719 | md_new_event(mddev); |
| 8720 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 8721 | } |
| 8722 | } |
| 8723 | no_add: |
| 8724 | if (removed) |
| 8725 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 8726 | return spares; |
| 8727 | } |
| 8728 | |
| 8729 | static void md_start_sync(struct work_struct *ws) |
| 8730 | { |
| 8731 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
| 8732 | |
| 8733 | mddev->sync_thread = md_register_thread(md_do_sync, |
| 8734 | mddev, |
| 8735 | "resync"); |
| 8736 | if (!mddev->sync_thread) { |
| 8737 | pr_warn("%s: could not start resync thread...\n", |
| 8738 | mdname(mddev)); |
| 8739 | /* leave the spares where they are, it shouldn't hurt */ |
| 8740 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 8741 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
| 8742 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
| 8743 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 8744 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 8745 | wake_up(&resync_wait); |
| 8746 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
| 8747 | &mddev->recovery)) |
| 8748 | if (mddev->sysfs_action) |
| 8749 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
| 8750 | } else |
| 8751 | md_wakeup_thread(mddev->sync_thread); |
| 8752 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
| 8753 | md_new_event(mddev); |
| 8754 | } |
| 8755 | |
| 8756 | /* |
| 8757 | * This routine is regularly called by all per-raid-array threads to |
| 8758 | * deal with generic issues like resync and super-block update. |
| 8759 | * Raid personalities that don't have a thread (linear/raid0) do not |
| 8760 | * need this as they never do any recovery or update the superblock. |
| 8761 | * |
| 8762 | * It does not do any resync itself, but rather "forks" off other threads |
| 8763 | * to do that as needed. |
| 8764 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in |
| 8765 | * "->recovery" and create a thread at ->sync_thread. |
| 8766 | * When the thread finishes it sets MD_RECOVERY_DONE |
| 8767 | * and wakeups up this thread which will reap the thread and finish up. |
| 8768 | * This thread also removes any faulty devices (with nr_pending == 0). |
| 8769 | * |
| 8770 | * The overall approach is: |
| 8771 | * 1/ if the superblock needs updating, update it. |
| 8772 | * 2/ If a recovery thread is running, don't do anything else. |
| 8773 | * 3/ If recovery has finished, clean up, possibly marking spares active. |
| 8774 | * 4/ If there are any faulty devices, remove them. |
| 8775 | * 5/ If array is degraded, try to add spares devices |
| 8776 | * 6/ If array has spares or is not in-sync, start a resync thread. |
| 8777 | */ |
| 8778 | void md_check_recovery(struct mddev *mddev) |
| 8779 | { |
| 8780 | if (mddev->suspended) |
| 8781 | return; |
| 8782 | |
| 8783 | if (mddev->bitmap) |
| 8784 | bitmap_daemon_work(mddev); |
| 8785 | |
| 8786 | if (signal_pending(current)) { |
| 8787 | if (mddev->pers->sync_request && !mddev->external) { |
| 8788 | pr_debug("md: %s in immediate safe mode\n", |
| 8789 | mdname(mddev)); |
| 8790 | mddev->safemode = 2; |
| 8791 | } |
| 8792 | flush_signals(current); |
| 8793 | } |
| 8794 | |
| 8795 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
| 8796 | return; |
| 8797 | if ( ! ( |
| 8798 | (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) || |
| 8799 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
| 8800 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
| 8801 | (mddev->external == 0 && mddev->safemode == 1) || |
| 8802 | (mddev->safemode == 2 |
| 8803 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) |
| 8804 | )) |
| 8805 | return; |
| 8806 | |
| 8807 | if (mddev_trylock(mddev)) { |
| 8808 | int spares = 0; |
| 8809 | |
| 8810 | if (!mddev->external && mddev->safemode == 1) |
| 8811 | mddev->safemode = 0; |
| 8812 | |
| 8813 | if (mddev->ro) { |
| 8814 | struct md_rdev *rdev; |
| 8815 | if (!mddev->external && mddev->in_sync) |
| 8816 | /* 'Blocked' flag not needed as failed devices |
| 8817 | * will be recorded if array switched to read/write. |
| 8818 | * Leaving it set will prevent the device |
| 8819 | * from being removed. |
| 8820 | */ |
| 8821 | rdev_for_each(rdev, mddev) |
| 8822 | clear_bit(Blocked, &rdev->flags); |
| 8823 | /* On a read-only array we can: |
| 8824 | * - remove failed devices |
| 8825 | * - add already-in_sync devices if the array itself |
| 8826 | * is in-sync. |
| 8827 | * As we only add devices that are already in-sync, |
| 8828 | * we can activate the spares immediately. |
| 8829 | */ |
| 8830 | remove_and_add_spares(mddev, NULL); |
| 8831 | /* There is no thread, but we need to call |
| 8832 | * ->spare_active and clear saved_raid_disk |
| 8833 | */ |
| 8834 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 8835 | md_reap_sync_thread(mddev); |
| 8836 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 8837 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 8838 | clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); |
| 8839 | goto unlock; |
| 8840 | } |
| 8841 | |
| 8842 | if (mddev_is_clustered(mddev)) { |
| 8843 | struct md_rdev *rdev; |
| 8844 | /* kick the device if another node issued a |
| 8845 | * remove disk. |
| 8846 | */ |
| 8847 | rdev_for_each(rdev, mddev) { |
| 8848 | if (test_and_clear_bit(ClusterRemove, &rdev->flags) && |
| 8849 | rdev->raid_disk < 0) |
| 8850 | md_kick_rdev_from_array(rdev); |
| 8851 | } |
| 8852 | } |
| 8853 | |
| 8854 | if (!mddev->external && !mddev->in_sync) { |
| 8855 | spin_lock(&mddev->lock); |
| 8856 | set_in_sync(mddev); |
| 8857 | spin_unlock(&mddev->lock); |
| 8858 | } |
| 8859 | |
| 8860 | if (mddev->sb_flags) |
| 8861 | md_update_sb(mddev, 0); |
| 8862 | |
| 8863 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
| 8864 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { |
| 8865 | /* resync/recovery still happening */ |
| 8866 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 8867 | goto unlock; |
| 8868 | } |
| 8869 | if (mddev->sync_thread) { |
| 8870 | md_reap_sync_thread(mddev); |
| 8871 | goto unlock; |
| 8872 | } |
| 8873 | /* Set RUNNING before clearing NEEDED to avoid |
| 8874 | * any transients in the value of "sync_action". |
| 8875 | */ |
| 8876 | mddev->curr_resync_completed = 0; |
| 8877 | spin_lock(&mddev->lock); |
| 8878 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 8879 | spin_unlock(&mddev->lock); |
| 8880 | /* Clear some bits that don't mean anything, but |
| 8881 | * might be left set |
| 8882 | */ |
| 8883 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 8884 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
| 8885 | |
| 8886 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
| 8887 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
| 8888 | goto not_running; |
| 8889 | /* no recovery is running. |
| 8890 | * remove any failed drives, then |
| 8891 | * add spares if possible. |
| 8892 | * Spares are also removed and re-added, to allow |
| 8893 | * the personality to fail the re-add. |
| 8894 | */ |
| 8895 | |
| 8896 | if (mddev->reshape_position != MaxSector) { |
| 8897 | if (mddev->pers->check_reshape == NULL || |
| 8898 | mddev->pers->check_reshape(mddev) != 0) |
| 8899 | /* Cannot proceed */ |
| 8900 | goto not_running; |
| 8901 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
| 8902 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 8903 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
| 8904 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 8905 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 8906 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
| 8907 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 8908 | } else if (mddev->recovery_cp < MaxSector) { |
| 8909 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 8910 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 8911 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
| 8912 | /* nothing to be done ... */ |
| 8913 | goto not_running; |
| 8914 | |
| 8915 | if (mddev->pers->sync_request) { |
| 8916 | if (spares) { |
| 8917 | /* We are adding a device or devices to an array |
| 8918 | * which has the bitmap stored on all devices. |
| 8919 | * So make sure all bitmap pages get written |
| 8920 | */ |
| 8921 | bitmap_write_all(mddev->bitmap); |
| 8922 | } |
| 8923 | INIT_WORK(&mddev->del_work, md_start_sync); |
| 8924 | queue_work(md_misc_wq, &mddev->del_work); |
| 8925 | goto unlock; |
| 8926 | } |
| 8927 | not_running: |
| 8928 | if (!mddev->sync_thread) { |
| 8929 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 8930 | wake_up(&resync_wait); |
| 8931 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
| 8932 | &mddev->recovery)) |
| 8933 | if (mddev->sysfs_action) |
| 8934 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
| 8935 | } |
| 8936 | unlock: |
| 8937 | wake_up(&mddev->sb_wait); |
| 8938 | mddev_unlock(mddev); |
| 8939 | } else if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) { |
| 8940 | /* Write superblock - thread that called mddev_suspend() |
| 8941 | * holds reconfig_mutex for us. |
| 8942 | */ |
| 8943 | set_bit(MD_UPDATING_SB, &mddev->flags); |
| 8944 | smp_mb__after_atomic(); |
| 8945 | if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags)) |
| 8946 | md_update_sb(mddev, 0); |
| 8947 | clear_bit_unlock(MD_UPDATING_SB, &mddev->flags); |
| 8948 | wake_up(&mddev->sb_wait); |
| 8949 | } |
| 8950 | } |
| 8951 | EXPORT_SYMBOL(md_check_recovery); |
| 8952 | |
| 8953 | void md_reap_sync_thread(struct mddev *mddev) |
| 8954 | { |
| 8955 | struct md_rdev *rdev; |
| 8956 | |
| 8957 | /* resync has finished, collect result */ |
| 8958 | md_unregister_thread(&mddev->sync_thread); |
| 8959 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
| 8960 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
| 8961 | /* success...*/ |
| 8962 | /* activate any spares */ |
| 8963 | if (mddev->pers->spare_active(mddev)) { |
| 8964 | sysfs_notify(&mddev->kobj, NULL, |
| 8965 | "degraded"); |
| 8966 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
| 8967 | } |
| 8968 | } |
| 8969 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| 8970 | mddev->pers->finish_reshape) |
| 8971 | mddev->pers->finish_reshape(mddev); |
| 8972 | |
| 8973 | /* If array is no-longer degraded, then any saved_raid_disk |
| 8974 | * information must be scrapped. |
| 8975 | */ |
| 8976 | if (!mddev->degraded) |
| 8977 | rdev_for_each(rdev, mddev) |
| 8978 | rdev->saved_raid_disk = -1; |
| 8979 | |
| 8980 | md_update_sb(mddev, 1); |
| 8981 | /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can |
| 8982 | * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by |
| 8983 | * clustered raid */ |
| 8984 | if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags)) |
| 8985 | md_cluster_ops->resync_finish(mddev); |
| 8986 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 8987 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
| 8988 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 8989 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
| 8990 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
| 8991 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 8992 | wake_up(&resync_wait); |
| 8993 | /* flag recovery needed just to double check */ |
| 8994 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 8995 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
| 8996 | md_new_event(mddev); |
| 8997 | if (mddev->event_work.func) |
| 8998 | queue_work(md_misc_wq, &mddev->event_work); |
| 8999 | } |
| 9000 | EXPORT_SYMBOL(md_reap_sync_thread); |
| 9001 | |
| 9002 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
| 9003 | { |
| 9004 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
| 9005 | wait_event_timeout(rdev->blocked_wait, |
| 9006 | !test_bit(Blocked, &rdev->flags) && |
| 9007 | !test_bit(BlockedBadBlocks, &rdev->flags), |
| 9008 | msecs_to_jiffies(5000)); |
| 9009 | rdev_dec_pending(rdev, mddev); |
| 9010 | } |
| 9011 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); |
| 9012 | |
| 9013 | void md_finish_reshape(struct mddev *mddev) |
| 9014 | { |
| 9015 | /* called be personality module when reshape completes. */ |
| 9016 | struct md_rdev *rdev; |
| 9017 | |
| 9018 | rdev_for_each(rdev, mddev) { |
| 9019 | if (rdev->data_offset > rdev->new_data_offset) |
| 9020 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; |
| 9021 | else |
| 9022 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; |
| 9023 | rdev->data_offset = rdev->new_data_offset; |
| 9024 | } |
| 9025 | } |
| 9026 | EXPORT_SYMBOL(md_finish_reshape); |
| 9027 | |
| 9028 | /* Bad block management */ |
| 9029 | |
| 9030 | /* Returns 1 on success, 0 on failure */ |
| 9031 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
| 9032 | int is_new) |
| 9033 | { |
| 9034 | struct mddev *mddev = rdev->mddev; |
| 9035 | int rv; |
| 9036 | if (is_new) |
| 9037 | s += rdev->new_data_offset; |
| 9038 | else |
| 9039 | s += rdev->data_offset; |
| 9040 | rv = badblocks_set(&rdev->badblocks, s, sectors, 0); |
| 9041 | if (rv == 0) { |
| 9042 | /* Make sure they get written out promptly */ |
| 9043 | if (test_bit(ExternalBbl, &rdev->flags)) |
| 9044 | sysfs_notify(&rdev->kobj, NULL, |
| 9045 | "unacknowledged_bad_blocks"); |
| 9046 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
| 9047 | set_mask_bits(&mddev->sb_flags, 0, |
| 9048 | BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING)); |
| 9049 | md_wakeup_thread(rdev->mddev->thread); |
| 9050 | return 1; |
| 9051 | } else |
| 9052 | return 0; |
| 9053 | } |
| 9054 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); |
| 9055 | |
| 9056 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
| 9057 | int is_new) |
| 9058 | { |
| 9059 | int rv; |
| 9060 | if (is_new) |
| 9061 | s += rdev->new_data_offset; |
| 9062 | else |
| 9063 | s += rdev->data_offset; |
| 9064 | rv = badblocks_clear(&rdev->badblocks, s, sectors); |
| 9065 | if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags)) |
| 9066 | sysfs_notify(&rdev->kobj, NULL, "bad_blocks"); |
| 9067 | return rv; |
| 9068 | } |
| 9069 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); |
| 9070 | |
| 9071 | static int md_notify_reboot(struct notifier_block *this, |
| 9072 | unsigned long code, void *x) |
| 9073 | { |
| 9074 | struct list_head *tmp; |
| 9075 | struct mddev *mddev; |
| 9076 | int need_delay = 0; |
| 9077 | |
| 9078 | for_each_mddev(mddev, tmp) { |
| 9079 | if (mddev_trylock(mddev)) { |
| 9080 | if (mddev->pers) |
| 9081 | __md_stop_writes(mddev); |
| 9082 | if (mddev->persistent) |
| 9083 | mddev->safemode = 2; |
| 9084 | mddev_unlock(mddev); |
| 9085 | } |
| 9086 | need_delay = 1; |
| 9087 | } |
| 9088 | /* |
| 9089 | * certain more exotic SCSI devices are known to be |
| 9090 | * volatile wrt too early system reboots. While the |
| 9091 | * right place to handle this issue is the given |
| 9092 | * driver, we do want to have a safe RAID driver ... |
| 9093 | */ |
| 9094 | if (need_delay) |
| 9095 | mdelay(1000*1); |
| 9096 | |
| 9097 | return NOTIFY_DONE; |
| 9098 | } |
| 9099 | |
| 9100 | static struct notifier_block md_notifier = { |
| 9101 | .notifier_call = md_notify_reboot, |
| 9102 | .next = NULL, |
| 9103 | .priority = INT_MAX, /* before any real devices */ |
| 9104 | }; |
| 9105 | |
| 9106 | static void md_geninit(void) |
| 9107 | { |
| 9108 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
| 9109 | |
| 9110 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
| 9111 | } |
| 9112 | |
| 9113 | static int __init md_init(void) |
| 9114 | { |
| 9115 | int ret = -ENOMEM; |
| 9116 | |
| 9117 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
| 9118 | if (!md_wq) |
| 9119 | goto err_wq; |
| 9120 | |
| 9121 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); |
| 9122 | if (!md_misc_wq) |
| 9123 | goto err_misc_wq; |
| 9124 | |
| 9125 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) |
| 9126 | goto err_md; |
| 9127 | |
| 9128 | if ((ret = register_blkdev(0, "mdp")) < 0) |
| 9129 | goto err_mdp; |
| 9130 | mdp_major = ret; |
| 9131 | |
| 9132 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
| 9133 | md_probe, NULL, NULL); |
| 9134 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, |
| 9135 | md_probe, NULL, NULL); |
| 9136 | |
| 9137 | register_reboot_notifier(&md_notifier); |
| 9138 | raid_table_header = register_sysctl_table(raid_root_table); |
| 9139 | |
| 9140 | md_geninit(); |
| 9141 | return 0; |
| 9142 | |
| 9143 | err_mdp: |
| 9144 | unregister_blkdev(MD_MAJOR, "md"); |
| 9145 | err_md: |
| 9146 | destroy_workqueue(md_misc_wq); |
| 9147 | err_misc_wq: |
| 9148 | destroy_workqueue(md_wq); |
| 9149 | err_wq: |
| 9150 | return ret; |
| 9151 | } |
| 9152 | |
| 9153 | static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) |
| 9154 | { |
| 9155 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
| 9156 | struct md_rdev *rdev2; |
| 9157 | int role, ret; |
| 9158 | char b[BDEVNAME_SIZE]; |
| 9159 | |
| 9160 | /* |
| 9161 | * If size is changed in another node then we need to |
| 9162 | * do resize as well. |
| 9163 | */ |
| 9164 | if (mddev->dev_sectors != le64_to_cpu(sb->size)) { |
| 9165 | ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size)); |
| 9166 | if (ret) |
| 9167 | pr_info("md-cluster: resize failed\n"); |
| 9168 | else |
| 9169 | bitmap_update_sb(mddev->bitmap); |
| 9170 | } |
| 9171 | |
| 9172 | /* Check for change of roles in the active devices */ |
| 9173 | rdev_for_each(rdev2, mddev) { |
| 9174 | if (test_bit(Faulty, &rdev2->flags)) |
| 9175 | continue; |
| 9176 | |
| 9177 | /* Check if the roles changed */ |
| 9178 | role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); |
| 9179 | |
| 9180 | if (test_bit(Candidate, &rdev2->flags)) { |
| 9181 | if (role == 0xfffe) { |
| 9182 | pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); |
| 9183 | md_kick_rdev_from_array(rdev2); |
| 9184 | continue; |
| 9185 | } |
| 9186 | else |
| 9187 | clear_bit(Candidate, &rdev2->flags); |
| 9188 | } |
| 9189 | |
| 9190 | if (role != rdev2->raid_disk) { |
| 9191 | /* got activated */ |
| 9192 | if (rdev2->raid_disk == -1 && role != 0xffff) { |
| 9193 | rdev2->saved_raid_disk = role; |
| 9194 | ret = remove_and_add_spares(mddev, rdev2); |
| 9195 | pr_info("Activated spare: %s\n", |
| 9196 | bdevname(rdev2->bdev,b)); |
| 9197 | /* wakeup mddev->thread here, so array could |
| 9198 | * perform resync with the new activated disk */ |
| 9199 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 9200 | md_wakeup_thread(mddev->thread); |
| 9201 | |
| 9202 | } |
| 9203 | /* device faulty |
| 9204 | * We just want to do the minimum to mark the disk |
| 9205 | * as faulty. The recovery is performed by the |
| 9206 | * one who initiated the error. |
| 9207 | */ |
| 9208 | if ((role == 0xfffe) || (role == 0xfffd)) { |
| 9209 | md_error(mddev, rdev2); |
| 9210 | clear_bit(Blocked, &rdev2->flags); |
| 9211 | } |
| 9212 | } |
| 9213 | } |
| 9214 | |
| 9215 | if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) |
| 9216 | update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); |
| 9217 | |
| 9218 | /* Finally set the event to be up to date */ |
| 9219 | mddev->events = le64_to_cpu(sb->events); |
| 9220 | } |
| 9221 | |
| 9222 | static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) |
| 9223 | { |
| 9224 | int err; |
| 9225 | struct page *swapout = rdev->sb_page; |
| 9226 | struct mdp_superblock_1 *sb; |
| 9227 | |
| 9228 | /* Store the sb page of the rdev in the swapout temporary |
| 9229 | * variable in case we err in the future |
| 9230 | */ |
| 9231 | rdev->sb_page = NULL; |
| 9232 | err = alloc_disk_sb(rdev); |
| 9233 | if (err == 0) { |
| 9234 | ClearPageUptodate(rdev->sb_page); |
| 9235 | rdev->sb_loaded = 0; |
| 9236 | err = super_types[mddev->major_version]. |
| 9237 | load_super(rdev, NULL, mddev->minor_version); |
| 9238 | } |
| 9239 | if (err < 0) { |
| 9240 | pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", |
| 9241 | __func__, __LINE__, rdev->desc_nr, err); |
| 9242 | if (rdev->sb_page) |
| 9243 | put_page(rdev->sb_page); |
| 9244 | rdev->sb_page = swapout; |
| 9245 | rdev->sb_loaded = 1; |
| 9246 | return err; |
| 9247 | } |
| 9248 | |
| 9249 | sb = page_address(rdev->sb_page); |
| 9250 | /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET |
| 9251 | * is not set |
| 9252 | */ |
| 9253 | |
| 9254 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) |
| 9255 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
| 9256 | |
| 9257 | /* The other node finished recovery, call spare_active to set |
| 9258 | * device In_sync and mddev->degraded |
| 9259 | */ |
| 9260 | if (rdev->recovery_offset == MaxSector && |
| 9261 | !test_bit(In_sync, &rdev->flags) && |
| 9262 | mddev->pers->spare_active(mddev)) |
| 9263 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| 9264 | |
| 9265 | put_page(swapout); |
| 9266 | return 0; |
| 9267 | } |
| 9268 | |
| 9269 | void md_reload_sb(struct mddev *mddev, int nr) |
| 9270 | { |
| 9271 | struct md_rdev *rdev; |
| 9272 | int err; |
| 9273 | |
| 9274 | /* Find the rdev */ |
| 9275 | rdev_for_each_rcu(rdev, mddev) { |
| 9276 | if (rdev->desc_nr == nr) |
| 9277 | break; |
| 9278 | } |
| 9279 | |
| 9280 | if (!rdev || rdev->desc_nr != nr) { |
| 9281 | pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); |
| 9282 | return; |
| 9283 | } |
| 9284 | |
| 9285 | err = read_rdev(mddev, rdev); |
| 9286 | if (err < 0) |
| 9287 | return; |
| 9288 | |
| 9289 | check_sb_changes(mddev, rdev); |
| 9290 | |
| 9291 | /* Read all rdev's to update recovery_offset */ |
| 9292 | rdev_for_each_rcu(rdev, mddev) { |
| 9293 | if (!test_bit(Faulty, &rdev->flags)) |
| 9294 | read_rdev(mddev, rdev); |
| 9295 | } |
| 9296 | } |
| 9297 | EXPORT_SYMBOL(md_reload_sb); |
| 9298 | |
| 9299 | #ifndef MODULE |
| 9300 | |
| 9301 | /* |
| 9302 | * Searches all registered partitions for autorun RAID arrays |
| 9303 | * at boot time. |
| 9304 | */ |
| 9305 | |
| 9306 | static DEFINE_MUTEX(detected_devices_mutex); |
| 9307 | static LIST_HEAD(all_detected_devices); |
| 9308 | struct detected_devices_node { |
| 9309 | struct list_head list; |
| 9310 | dev_t dev; |
| 9311 | }; |
| 9312 | |
| 9313 | void md_autodetect_dev(dev_t dev) |
| 9314 | { |
| 9315 | struct detected_devices_node *node_detected_dev; |
| 9316 | |
| 9317 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); |
| 9318 | if (node_detected_dev) { |
| 9319 | node_detected_dev->dev = dev; |
| 9320 | mutex_lock(&detected_devices_mutex); |
| 9321 | list_add_tail(&node_detected_dev->list, &all_detected_devices); |
| 9322 | mutex_unlock(&detected_devices_mutex); |
| 9323 | } |
| 9324 | } |
| 9325 | |
| 9326 | static void autostart_arrays(int part) |
| 9327 | { |
| 9328 | struct md_rdev *rdev; |
| 9329 | struct detected_devices_node *node_detected_dev; |
| 9330 | dev_t dev; |
| 9331 | int i_scanned, i_passed; |
| 9332 | |
| 9333 | i_scanned = 0; |
| 9334 | i_passed = 0; |
| 9335 | |
| 9336 | pr_info("md: Autodetecting RAID arrays.\n"); |
| 9337 | |
| 9338 | mutex_lock(&detected_devices_mutex); |
| 9339 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
| 9340 | i_scanned++; |
| 9341 | node_detected_dev = list_entry(all_detected_devices.next, |
| 9342 | struct detected_devices_node, list); |
| 9343 | list_del(&node_detected_dev->list); |
| 9344 | dev = node_detected_dev->dev; |
| 9345 | kfree(node_detected_dev); |
| 9346 | mutex_unlock(&detected_devices_mutex); |
| 9347 | rdev = md_import_device(dev,0, 90); |
| 9348 | mutex_lock(&detected_devices_mutex); |
| 9349 | if (IS_ERR(rdev)) |
| 9350 | continue; |
| 9351 | |
| 9352 | if (test_bit(Faulty, &rdev->flags)) |
| 9353 | continue; |
| 9354 | |
| 9355 | set_bit(AutoDetected, &rdev->flags); |
| 9356 | list_add(&rdev->same_set, &pending_raid_disks); |
| 9357 | i_passed++; |
| 9358 | } |
| 9359 | mutex_unlock(&detected_devices_mutex); |
| 9360 | |
| 9361 | pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed); |
| 9362 | |
| 9363 | autorun_devices(part); |
| 9364 | } |
| 9365 | |
| 9366 | #endif /* !MODULE */ |
| 9367 | |
| 9368 | static __exit void md_exit(void) |
| 9369 | { |
| 9370 | struct mddev *mddev; |
| 9371 | struct list_head *tmp; |
| 9372 | int delay = 1; |
| 9373 | |
| 9374 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
| 9375 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
| 9376 | |
| 9377 | unregister_blkdev(MD_MAJOR,"md"); |
| 9378 | unregister_blkdev(mdp_major, "mdp"); |
| 9379 | unregister_reboot_notifier(&md_notifier); |
| 9380 | unregister_sysctl_table(raid_table_header); |
| 9381 | |
| 9382 | /* We cannot unload the modules while some process is |
| 9383 | * waiting for us in select() or poll() - wake them up |
| 9384 | */ |
| 9385 | md_unloading = 1; |
| 9386 | while (waitqueue_active(&md_event_waiters)) { |
| 9387 | /* not safe to leave yet */ |
| 9388 | wake_up(&md_event_waiters); |
| 9389 | msleep(delay); |
| 9390 | delay += delay; |
| 9391 | } |
| 9392 | remove_proc_entry("mdstat", NULL); |
| 9393 | |
| 9394 | for_each_mddev(mddev, tmp) { |
| 9395 | export_array(mddev); |
| 9396 | mddev->ctime = 0; |
| 9397 | mddev->hold_active = 0; |
| 9398 | /* |
| 9399 | * for_each_mddev() will call mddev_put() at the end of each |
| 9400 | * iteration. As the mddev is now fully clear, this will |
| 9401 | * schedule the mddev for destruction by a workqueue, and the |
| 9402 | * destroy_workqueue() below will wait for that to complete. |
| 9403 | */ |
| 9404 | } |
| 9405 | destroy_workqueue(md_misc_wq); |
| 9406 | destroy_workqueue(md_wq); |
| 9407 | } |
| 9408 | |
| 9409 | subsys_initcall(md_init); |
| 9410 | module_exit(md_exit) |
| 9411 | |
| 9412 | static int get_ro(char *buffer, const struct kernel_param *kp) |
| 9413 | { |
| 9414 | return sprintf(buffer, "%d", start_readonly); |
| 9415 | } |
| 9416 | static int set_ro(const char *val, const struct kernel_param *kp) |
| 9417 | { |
| 9418 | return kstrtouint(val, 10, (unsigned int *)&start_readonly); |
| 9419 | } |
| 9420 | |
| 9421 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
| 9422 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); |
| 9423 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
| 9424 | module_param(create_on_open, bool, S_IRUSR|S_IWUSR); |
| 9425 | |
| 9426 | MODULE_LICENSE("GPL"); |
| 9427 | MODULE_DESCRIPTION("MD RAID framework"); |
| 9428 | MODULE_ALIAS("md"); |
| 9429 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |