projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'char-misc-4.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[linux-2.6-block.git] / drivers / md / md.c
CommitLineData
1da177e4
LT		 1/*
2 md.c : Multiple Devices driver for Linux
f72ffdd6 3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
1da177e4
LT		 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
32a7627c
N		 22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
1da177e4
LT		 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
a6fb0934 35#include <linux/kthread.h>
bff61975 36#include <linux/blkdev.h>
fc974ee2 37#include <linux/badblocks.h>
1da177e4 38#include <linux/sysctl.h>
bff61975 39#include <linux/seq_file.h>
ff01bb48 40#include <linux/fs.h>
d7603b7e 41#include <linux/poll.h>
16f17b39 42#include <linux/ctype.h>
e7d2860b 43#include <linux/string.h>
fb4d8c76
N		 44#include <linux/hdreg.h>
45#include <linux/proc_fs.h>
46#include <linux/random.h>
056075c7 47#include <linux/module.h>
fb4d8c76 48#include <linux/reboot.h>
32a7627c 49#include <linux/file.h>
aa98aa31 50#include <linux/compat.h>
25570727 51#include <linux/delay.h>
bff61975
N		 52#include <linux/raid/md_p.h>
53#include <linux/raid/md_u.h>
5a0e3ad6 54#include <linux/slab.h>
43b2e5d8 55#include "md.h"
ef740c37 56#include "bitmap.h"
edb39c9d 57#include "md-cluster.h"
1da177e4 58
1da177e4 59#ifndef MODULE
d710e138 60static void autostart_arrays(int part);
1da177e4
LT		 61#endif
62
01f96c0a
N		 63/* pers_list is a list of registered personalities protected
64 * by pers_lock.
65 * pers_lock does extra service to protect accesses to
66 * mddev->thread when the mutex cannot be held.
67 */
2604b703 68static LIST_HEAD(pers_list);
1da177e4
LT		 69static DEFINE_SPINLOCK(pers_lock);
70
edb39c9d 71struct md_cluster_operations *md_cluster_ops;
589a1c49 72EXPORT_SYMBOL(md_cluster_ops);
edb39c9d
GR		 73struct module *md_cluster_mod;
74EXPORT_SYMBOL(md_cluster_mod);
75
90b08710 76static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
e804ac78
TH		 77static struct workqueue_struct *md_wq;
78static struct workqueue_struct *md_misc_wq;
90b08710 79
746d3207
N		 80static int remove_and_add_spares(struct mddev *mddev,
81 struct md_rdev *this);
5aa61f42 82static void mddev_detach(struct mddev *mddev);
746d3207 83
1e50915f
RB		 84/*
85 * Default number of read corrections we'll attempt on an rdev
86 * before ejecting it from the array. We divide the read error
87 * count by 2 for every hour elapsed between read errors.
88 */
89#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
1da177e4
LT		 90/*
91 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
92 * is 1000 KB/sec, so the extra system load does not show up that much.
93 * Increase it if you want to have more _guaranteed_ speed. Note that
338cec32 94 * the RAID driver will use the maximum available bandwidth if the IO
1da177e4
LT		 95 * subsystem is idle. There is also an 'absolute maximum' reconstruction
96 * speed limit - in case reconstruction slows down your system despite
97 * idle IO detection.
98 *
99 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88202a0c 100 * or /sys/block/mdX/md/sync_speed_{min,max}
1da177e4
LT		 101 */
102
103static int sysctl_speed_limit_min = 1000;
104static int sysctl_speed_limit_max = 200000;
fd01b88c 105static inline int speed_min(struct mddev *mddev)
88202a0c
N		 106{
107 return mddev->sync_speed_min ?
108 mddev->sync_speed_min : sysctl_speed_limit_min;
109}
110
fd01b88c 111static inline int speed_max(struct mddev *mddev)
88202a0c
N		 112{
113 return mddev->sync_speed_max ?
114 mddev->sync_speed_max : sysctl_speed_limit_max;
115}
1da177e4
LT		 116
117static struct ctl_table_header *raid_table_header;
118
82592c38 119static struct ctl_table raid_table[] = {
1da177e4 120 {
1da177e4
LT		 121 .procname = "speed_limit_min",
122 .data = &sysctl_speed_limit_min,
123 .maxlen = sizeof(int),
80ca3a44 124 .mode = S_IRUGO|S_IWUSR,
6d456111 125 .proc_handler = proc_dointvec,
1da177e4
LT		 126 },
127 {
1da177e4
LT		 128 .procname = "speed_limit_max",
129 .data = &sysctl_speed_limit_max,
130 .maxlen = sizeof(int),
80ca3a44 131 .mode = S_IRUGO|S_IWUSR,
6d456111 132 .proc_handler = proc_dointvec,
1da177e4 133 },
894d2491 134 { }
1da177e4
LT		 135};
136
82592c38 137static struct ctl_table raid_dir_table[] = {
1da177e4 138 {
1da177e4
LT		 139 .procname = "raid",
140 .maxlen = 0,
80ca3a44 141 .mode = S_IRUGO|S_IXUGO,
1da177e4
LT		 142 .child = raid_table,
143 },
894d2491 144 { }
1da177e4
LT		 145};
146
82592c38 147static struct ctl_table raid_root_table[] = {
1da177e4 148 {
1da177e4
LT		 149 .procname = "dev",
150 .maxlen = 0,
151 .mode = 0555,
152 .child = raid_dir_table,
153 },
894d2491 154 { }
1da177e4
LT		 155};
156
83d5cde4 157static const struct block_device_operations md_fops;
1da177e4 158
f91de92e
N		 159static int start_readonly;
160
a167f663
N		 161/* bio_clone_mddev
162 * like bio_clone, but with a local bio set
163 */
164
a167f663 165struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
fd01b88c 166 struct mddev *mddev)
a167f663
N		 167{
168 struct bio *b;
a167f663
N		 169
170 if (!mddev || !mddev->bio_set)
171 return bio_alloc(gfp_mask, nr_iovecs);
172
395c72a7 173 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
a167f663
N		 174 if (!b)
175 return NULL;
a167f663
N		 176 return b;
177}
178EXPORT_SYMBOL_GPL(bio_alloc_mddev);
179
180struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
fd01b88c 181 struct mddev *mddev)
a167f663 182{
a167f663
N		 183 if (!mddev || !mddev->bio_set)
184 return bio_clone(bio, gfp_mask);
185
bf800ef1 186 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
a167f663
N		 187}
188EXPORT_SYMBOL_GPL(bio_clone_mddev);
189
d7603b7e
N		 190/*
191 * We have a system wide 'event count' that is incremented
192 * on any 'interesting' event, and readers of /proc/mdstat
193 * can use 'poll' or 'select' to find out when the event
194 * count increases.
195 *
196 * Events are:
197 * start array, stop array, error, add device, remove device,
198 * start build, activate spare
199 */
2989ddbd 200static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
d7603b7e 201static atomic_t md_event_count;
fd01b88c 202void md_new_event(struct mddev *mddev)
d7603b7e
N		 203{
204 atomic_inc(&md_event_count);
205 wake_up(&md_event_waiters);
206}
29269553 207EXPORT_SYMBOL_GPL(md_new_event);
d7603b7e 208
1da177e4
LT		 209/*
210 * Enables to iterate over all existing md arrays
211 * all_mddevs_lock protects this list.
212 */
213static LIST_HEAD(all_mddevs);
214static DEFINE_SPINLOCK(all_mddevs_lock);
215
1da177e4
LT		 216/*
217 * iterates through all used mddevs in the system.
218 * We take care to grab the all_mddevs_lock whenever navigating
219 * the list, and to always hold a refcount when unlocked.
220 * Any code which breaks out of this loop while own
221 * a reference to the current mddev and must mddev_put it.
222 */
fd01b88c 223#define for_each_mddev(_mddev,_tmp) \
1da177e4 224 \
f72ffdd6 225 for (({ spin_lock(&all_mddevs_lock); \
fd01b88c
N		 226 _tmp = all_mddevs.next; \
227 _mddev = NULL;}); \
228 ({ if (_tmp != &all_mddevs) \
229 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
1da177e4 230 spin_unlock(&all_mddevs_lock); \
fd01b88c
N		 231 if (_mddev) mddev_put(_mddev); \
232 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
233 _tmp != &all_mddevs;}); \
1da177e4 234 ({ spin_lock(&all_mddevs_lock); \
fd01b88c 235 _tmp = _tmp->next;}) \
1da177e4
LT		 236 )
237
409c57f3
N		 238/* Rather than calling directly into the personality make_request function,
239 * IO requests come here first so that we can check if the device is
240 * being suspended pending a reconfiguration.
241 * We hold a refcount over the call to ->make_request. By the time that
242 * call has finished, the bio has been linked into some internal structure
243 * and so is visible to ->quiesce(), so we don't need the refcount any more.
244 */
dece1635 245static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
1da177e4 246{
49077326 247 const int rw = bio_data_dir(bio);
fd01b88c 248 struct mddev *mddev = q->queuedata;
e91ece55 249 unsigned int sectors;
74672d06 250 int cpu;
49077326 251
54efd50b
KO		 252 blk_queue_split(q, &bio, q->bio_split);
253
274d8cbd 254 if (mddev == NULL || mddev->pers == NULL) {
409c57f3 255 bio_io_error(bio);
dece1635 256 return BLK_QC_T_NONE;
409c57f3 257 }
bbfa57c0 258 if (mddev->ro == 1 && unlikely(rw == WRITE)) {
4246a0b6
CH		 259 if (bio_sectors(bio) != 0)
260 bio->bi_error = -EROFS;
261 bio_endio(bio);
dece1635 262 return BLK_QC_T_NONE;
bbfa57c0 263 }
0ca69886 264 smp_rmb(); /* Ensure implications of 'active' are visible */
409c57f3 265 rcu_read_lock();
e9c7469b 266 if (mddev->suspended) {
409c57f3
N		 267 DEFINE_WAIT(__wait);
268 for (;;) {
269 prepare_to_wait(&mddev->sb_wait, &__wait,
270 TASK_UNINTERRUPTIBLE);
e9c7469b 271 if (!mddev->suspended)
409c57f3
N		 272 break;
273 rcu_read_unlock();
274 schedule();
275 rcu_read_lock();
276 }
277 finish_wait(&mddev->sb_wait, &__wait);
278 }
279 atomic_inc(&mddev->active_io);
280 rcu_read_unlock();
49077326 281
e91ece55
CM		 282 /*
283 * save the sectors now since our bio can
284 * go away inside make_request
285 */
286 sectors = bio_sectors(bio);
5a7bbad2 287 mddev->pers->make_request(mddev, bio);
49077326 288
74672d06
GZ		 289 cpu = part_stat_lock();
290 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
291 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
292 part_stat_unlock();
49077326 293
409c57f3
N		 294 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
295 wake_up(&mddev->sb_wait);
dece1635
JA		 296
297 return BLK_QC_T_NONE;
409c57f3
N		 298}
299
9e35b99c
N		 300/* mddev_suspend makes sure no new requests are submitted
301 * to the device, and that any requests that have been submitted
302 * are completely handled.
afa0f557
N		 303 * Once mddev_detach() is called and completes, the module will be
304 * completely unused.
9e35b99c 305 */
fd01b88c 306void mddev_suspend(struct mddev *mddev)
409c57f3 307{
70d9798b 308 WARN_ON_ONCE(current == mddev->thread->tsk);
0dc10e50
MP		 309 if (mddev->suspended++)
310 return;
409c57f3
N		 311 synchronize_rcu();
312 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
313 mddev->pers->quiesce(mddev, 1);
0d9f4f13
JB		 314
315 del_timer_sync(&mddev->safemode_timer);
409c57f3 316}
390ee602 317EXPORT_SYMBOL_GPL(mddev_suspend);
409c57f3 318
fd01b88c 319void mddev_resume(struct mddev *mddev)
409c57f3 320{
0dc10e50
MP		 321 if (--mddev->suspended)
322 return;
409c57f3
N		 323 wake_up(&mddev->sb_wait);
324 mddev->pers->quiesce(mddev, 0);
0fd018af 325
47525e59 326 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
0fd018af
JB		 327 md_wakeup_thread(mddev->thread);
328 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
1da177e4 329}
390ee602 330EXPORT_SYMBOL_GPL(mddev_resume);
1da177e4 331
fd01b88c 332int mddev_congested(struct mddev *mddev, int bits)
3fa841d7 333{
5c675f83
N		 334 struct md_personality *pers = mddev->pers;
335 int ret = 0;
336
337 rcu_read_lock();
338 if (mddev->suspended)
339 ret = 1;
340 else if (pers && pers->congested)
341 ret = pers->congested(mddev, bits);
342 rcu_read_unlock();
343 return ret;
344}
345EXPORT_SYMBOL_GPL(mddev_congested);
346static int md_congested(void *data, int bits)
347{
348 struct mddev *mddev = data;
349 return mddev_congested(mddev, bits);
3fa841d7 350}
3fa841d7 351
a2826aa9 352/*
e9c7469b 353 * Generic flush handling for md
a2826aa9
N		 354 */
355
4246a0b6 356static void md_end_flush(struct bio *bio)
a2826aa9 357{
3cb03002 358 struct md_rdev *rdev = bio->bi_private;
fd01b88c 359 struct mddev *mddev = rdev->mddev;
a2826aa9
N		 360
361 rdev_dec_pending(rdev, mddev);
362
363 if (atomic_dec_and_test(&mddev->flush_pending)) {
e9c7469b 364 /* The pre-request flush has finished */
e804ac78 365 queue_work(md_wq, &mddev->flush_work);
a2826aa9
N		 366 }
367 bio_put(bio);
368}
369
a7a07e69
N		 370static void md_submit_flush_data(struct work_struct *ws);
371
a035fc3e 372static void submit_flushes(struct work_struct *ws)
a2826aa9 373{
fd01b88c 374 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
3cb03002 375 struct md_rdev *rdev;
a2826aa9 376
a7a07e69
N		 377 INIT_WORK(&mddev->flush_work, md_submit_flush_data);
378 atomic_set(&mddev->flush_pending, 1);
a2826aa9 379 rcu_read_lock();
dafb20fa 380 rdev_for_each_rcu(rdev, mddev)
a2826aa9
N		 381 if (rdev->raid_disk >= 0 &&
382 !test_bit(Faulty, &rdev->flags)) {
383 /* Take two references, one is dropped
384 * when request finishes, one after
385 * we reclaim rcu_read_lock
386 */
387 struct bio *bi;
388 atomic_inc(&rdev->nr_pending);
389 atomic_inc(&rdev->nr_pending);
390 rcu_read_unlock();
b5e1b8ce 391 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
e9c7469b 392 bi->bi_end_io = md_end_flush;
a2826aa9
N		 393 bi->bi_private = rdev;
394 bi->bi_bdev = rdev->bdev;
395 atomic_inc(&mddev->flush_pending);
e9c7469b 396 submit_bio(WRITE_FLUSH, bi);
a2826aa9
N		 397 rcu_read_lock();
398 rdev_dec_pending(rdev, mddev);
399 }
400 rcu_read_unlock();
a7a07e69
N		 401 if (atomic_dec_and_test(&mddev->flush_pending))
402 queue_work(md_wq, &mddev->flush_work);
a2826aa9
N		 403}
404
e9c7469b 405static void md_submit_flush_data(struct work_struct *ws)
a2826aa9 406{
fd01b88c 407 struct mddev *mddev = container_of(ws, struct mddev, flush_work);
e9c7469b 408 struct bio *bio = mddev->flush_bio;
a2826aa9 409
4f024f37 410 if (bio->bi_iter.bi_size == 0)
a2826aa9 411 /* an empty barrier - all done */
4246a0b6 412 bio_endio(bio);
a2826aa9 413 else {
e9c7469b 414 bio->bi_rw &= ~REQ_FLUSH;
5a7bbad2 415 mddev->pers->make_request(mddev, bio);
a2826aa9 416 }
2b74e12e
N		 417
418 mddev->flush_bio = NULL;
419 wake_up(&mddev->sb_wait);
a2826aa9
N		 420}
421
fd01b88c 422void md_flush_request(struct mddev *mddev, struct bio *bio)
a2826aa9 423{
85572d7c 424 spin_lock_irq(&mddev->lock);
a2826aa9 425 wait_event_lock_irq(mddev->sb_wait,
e9c7469b 426 !mddev->flush_bio,
85572d7c 427 mddev->lock);
e9c7469b 428 mddev->flush_bio = bio;
85572d7c 429 spin_unlock_irq(&mddev->lock);
a2826aa9 430
a035fc3e
N		 431 INIT_WORK(&mddev->flush_work, submit_flushes);
432 queue_work(md_wq, &mddev->flush_work);
a2826aa9 433}
e9c7469b 434EXPORT_SYMBOL(md_flush_request);
409c57f3 435
74018dc3 436void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
97658cdd 437{
9cbb1750
N		 438 struct mddev *mddev = cb->data;
439 md_wakeup_thread(mddev->thread);
440 kfree(cb);
97658cdd 441}
9cbb1750 442EXPORT_SYMBOL(md_unplug);
2ac87401 443
fd01b88c 444static inline struct mddev *mddev_get(struct mddev *mddev)
1da177e4
LT		 445{
446 atomic_inc(&mddev->active);
447 return mddev;
448}
449
5fd3a17e 450static void mddev_delayed_delete(struct work_struct *ws);
d3374825 451
fd01b88c 452static void mddev_put(struct mddev *mddev)
1da177e4 453{
a167f663
N		 454 struct bio_set *bs = NULL;
455
1da177e4
LT		 456 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
457 return;
d3374825 458 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
cbd19983
N		 459 mddev->ctime == 0 && !mddev->hold_active) {
460 /* Array is not configured at all, and not held active,
461 * so destroy it */
af8a2434 462 list_del_init(&mddev->all_mddevs);
a167f663
N		 463 bs = mddev->bio_set;
464 mddev->bio_set = NULL;
d3374825 465 if (mddev->gendisk) {
e804ac78
TH		 466 /* We did a probe so need to clean up. Call
467 * queue_work inside the spinlock so that
468 * flush_workqueue() after mddev_find will
469 * succeed in waiting for the work to be done.
d3374825
N		 470 */
471 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
e804ac78 472 queue_work(md_misc_wq, &mddev->del_work);
d3374825
N		 473 } else
474 kfree(mddev);
475 }
476 spin_unlock(&all_mddevs_lock);
a167f663
N		 477 if (bs)
478 bioset_free(bs);
1da177e4
LT		 479}
480
25b2edfa
SL		 481static void md_safemode_timeout(unsigned long data);
482
fd01b88c 483void mddev_init(struct mddev *mddev)
fafd7fb0
N		 484{
485 mutex_init(&mddev->open_mutex);
486 mutex_init(&mddev->reconfig_mutex);
487 mutex_init(&mddev->bitmap_info.mutex);
488 INIT_LIST_HEAD(&mddev->disks);
489 INIT_LIST_HEAD(&mddev->all_mddevs);
25b2edfa
SL		 490 setup_timer(&mddev->safemode_timer, md_safemode_timeout,
491 (unsigned long) mddev);
fafd7fb0
N		 492 atomic_set(&mddev->active, 1);
493 atomic_set(&mddev->openers, 0);
494 atomic_set(&mddev->active_io, 0);
85572d7c 495 spin_lock_init(&mddev->lock);
fafd7fb0
N		 496 atomic_set(&mddev->flush_pending, 0);
497 init_waitqueue_head(&mddev->sb_wait);
498 init_waitqueue_head(&mddev->recovery_wait);
499 mddev->reshape_position = MaxSector;
2c810cdd 500 mddev->reshape_backwards = 0;
c4a39551 501 mddev->last_sync_action = "none";
fafd7fb0
N		 502 mddev->resync_min = 0;
503 mddev->resync_max = MaxSector;
504 mddev->level = LEVEL_NONE;
505}
390ee602 506EXPORT_SYMBOL_GPL(mddev_init);
fafd7fb0 507
f72ffdd6 508static struct mddev *mddev_find(dev_t unit)
1da177e4 509{
fd01b88c 510 struct mddev *mddev, *new = NULL;
1da177e4 511
8f5f02c4
N		 512 if (unit && MAJOR(unit) != MD_MAJOR)
513 unit &= ~((1<<MdpMinorShift)-1);
514
1da177e4
LT		 515 retry:
516 spin_lock(&all_mddevs_lock);
efeb53c0
N		 517
518 if (unit) {
519 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
520 if (mddev->unit == unit) {
521 mddev_get(mddev);
522 spin_unlock(&all_mddevs_lock);
523 kfree(new);
524 return mddev;
525 }
526
527 if (new) {
528 list_add(&new->all_mddevs, &all_mddevs);
1da177e4 529 spin_unlock(&all_mddevs_lock);
efeb53c0
N		 530 new->hold_active = UNTIL_IOCTL;
531 return new;
1da177e4 532 }
efeb53c0
N		 533 } else if (new) {
534 /* find an unused unit number */
535 static int next_minor = 512;
536 int start = next_minor;
537 int is_free = 0;
538 int dev = 0;
539 while (!is_free) {
540 dev = MKDEV(MD_MAJOR, next_minor);
541 next_minor++;
542 if (next_minor > MINORMASK)
543 next_minor = 0;
544 if (next_minor == start) {
545 /* Oh dear, all in use. */
546 spin_unlock(&all_mddevs_lock);
547 kfree(new);
548 return NULL;
549 }
f72ffdd6 550
efeb53c0
N		 551 is_free = 1;
552 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
553 if (mddev->unit == dev) {
554 is_free = 0;
555 break;
556 }
557 }
558 new->unit = dev;
559 new->md_minor = MINOR(dev);
560 new->hold_active = UNTIL_STOP;
1da177e4
LT		 561 list_add(&new->all_mddevs, &all_mddevs);
562 spin_unlock(&all_mddevs_lock);
563 return new;
564 }
565 spin_unlock(&all_mddevs_lock);
566
9ffae0cf 567 new = kzalloc(sizeof(*new), GFP_KERNEL);
1da177e4
LT		 568 if (!new)
569 return NULL;
570
1da177e4
LT		 571 new->unit = unit;
572 if (MAJOR(unit) == MD_MAJOR)
573 new->md_minor = MINOR(unit);
574 else
575 new->md_minor = MINOR(unit) >> MdpMinorShift;
576
fafd7fb0 577 mddev_init(new);
1da177e4 578
1da177e4
LT		 579 goto retry;
580}
581
b6eb127d
N		 582static struct attribute_group md_redundancy_group;
583
5c47daf6 584void mddev_unlock(struct mddev *mddev)
1da177e4 585{
a64c876f 586 if (mddev->to_remove) {
b6eb127d
N		 587 /* These cannot be removed under reconfig_mutex as
588 * an access to the files will try to take reconfig_mutex
589 * while holding the file unremovable, which leads to
590 * a deadlock.
bb4f1e9d
N		 591 * So hold set sysfs_active while the remove in happeing,
592 * and anything else which might set ->to_remove or my
593 * otherwise change the sysfs namespace will fail with
594 * -EBUSY if sysfs_active is still set.
595 * We set sysfs_active under reconfig_mutex and elsewhere
596 * test it under the same mutex to ensure its correct value
597 * is seen.
b6eb127d 598 */
a64c876f
N		 599 struct attribute_group *to_remove = mddev->to_remove;
600 mddev->to_remove = NULL;
bb4f1e9d 601 mddev->sysfs_active = 1;
b6eb127d
N		 602 mutex_unlock(&mddev->reconfig_mutex);
603
00bcb4ac
N		 604 if (mddev->kobj.sd) {
605 if (to_remove != &md_redundancy_group)
606 sysfs_remove_group(&mddev->kobj, to_remove);
607 if (mddev->pers == NULL ||
608 mddev->pers->sync_request == NULL) {
609 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
610 if (mddev->sysfs_action)
611 sysfs_put(mddev->sysfs_action);
612 mddev->sysfs_action = NULL;
613 }
a64c876f 614 }
bb4f1e9d 615 mddev->sysfs_active = 0;
b6eb127d
N		 616 } else
617 mutex_unlock(&mddev->reconfig_mutex);
1da177e4 618
751e67ca
CD		 619 /* As we've dropped the mutex we need a spinlock to
620 * make sure the thread doesn't disappear
01f96c0a
N		 621 */
622 spin_lock(&pers_lock);
005eca5e 623 md_wakeup_thread(mddev->thread);
01f96c0a 624 spin_unlock(&pers_lock);
1da177e4 625}
5c47daf6 626EXPORT_SYMBOL_GPL(mddev_unlock);
1da177e4 627
57d051dc 628struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr)
1ca69c4b
N		 629{
630 struct md_rdev *rdev;
631
632 rdev_for_each_rcu(rdev, mddev)
633 if (rdev->desc_nr == nr)
634 return rdev;
635
636 return NULL;
637}
57d051dc 638EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu);
1ca69c4b
N		 639
640static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
1da177e4 641{
3cb03002 642 struct md_rdev *rdev;
1da177e4 643
dafb20fa 644 rdev_for_each(rdev, mddev)
1da177e4
LT		 645 if (rdev->bdev->bd_dev == dev)
646 return rdev;
159ec1fc 647
1da177e4
LT		 648 return NULL;
649}
650
1ca69c4b
N		 651static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
652{
653 struct md_rdev *rdev;
654
655 rdev_for_each_rcu(rdev, mddev)
656 if (rdev->bdev->bd_dev == dev)
657 return rdev;
658
659 return NULL;
660}
661
84fc4b56 662static struct md_personality *find_pers(int level, char *clevel)
2604b703 663{
84fc4b56 664 struct md_personality *pers;
d9d166c2
N		 665 list_for_each_entry(pers, &pers_list, list) {
666 if (level != LEVEL_NONE && pers->level == level)
2604b703 667 return pers;
d9d166c2
N		 668 if (strcmp(pers->name, clevel)==0)
669 return pers;
670 }
2604b703
N		 671 return NULL;
672}
673
b73df2d3 674/* return the offset of the super block in 512byte sectors */
3cb03002 675static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
1da177e4 676{
57b2caa3 677 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
b73df2d3 678 return MD_NEW_SIZE_SECTORS(num_sectors);
1da177e4
LT		 679}
680
f72ffdd6 681static int alloc_disk_sb(struct md_rdev *rdev)
1da177e4 682{
1da177e4
LT		 683 rdev->sb_page = alloc_page(GFP_KERNEL);
684 if (!rdev->sb_page) {
685 printk(KERN_ALERT "md: out of memory.\n");
ebc24337 686 return -ENOMEM;
1da177e4
LT		 687 }
688
689 return 0;
690}
691
545c8795 692void md_rdev_clear(struct md_rdev *rdev)
1da177e4
LT		 693{
694 if (rdev->sb_page) {
2d1f3b5d 695 put_page(rdev->sb_page);
1da177e4
LT		 696 rdev->sb_loaded = 0;
697 rdev->sb_page = NULL;
0f420358 698 rdev->sb_start = 0;
dd8ac336 699 rdev->sectors = 0;
1da177e4 700 }
2699b672
N		 701 if (rdev->bb_page) {
702 put_page(rdev->bb_page);
703 rdev->bb_page = NULL;
704 }
d3b407fb 705 badblocks_exit(&rdev->badblocks);
1da177e4 706}
545c8795 707EXPORT_SYMBOL_GPL(md_rdev_clear);
1da177e4 708
4246a0b6 709static void super_written(struct bio *bio)
7bfa19f2 710{
3cb03002 711 struct md_rdev *rdev = bio->bi_private;
fd01b88c 712 struct mddev *mddev = rdev->mddev;
7bfa19f2 713
4246a0b6
CH		 714 if (bio->bi_error) {
715 printk("md: super_written gets error=%d\n", bio->bi_error);
a9701a30 716 md_error(mddev, rdev);
3a0f5bbb 717 }
7bfa19f2 718
a9701a30
N		 719 if (atomic_dec_and_test(&mddev->pending_writes))
720 wake_up(&mddev->sb_wait);
ed3b98c7 721 rdev_dec_pending(rdev, mddev);
f8b58edf 722 bio_put(bio);
7bfa19f2
N		 723}
724
fd01b88c 725void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
7bfa19f2
N		 726 sector_t sector, int size, struct page *page)
727{
728 /* write first size bytes of page to sector of rdev
729 * Increment mddev->pending_writes before returning
730 * and decrement it on completion, waking up sb_wait
731 * if zero is reached.
732 * If an error occurred, call md_error
733 */
a167f663 734 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
7bfa19f2 735
ed3b98c7
SL		 736 atomic_inc(&rdev->nr_pending);
737
a6ff7e08 738 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
4f024f37 739 bio->bi_iter.bi_sector = sector;
7bfa19f2
N		 740 bio_add_page(bio, page, size, 0);
741 bio->bi_private = rdev;
742 bio->bi_end_io = super_written;
a9701a30 743
7bfa19f2 744 atomic_inc(&mddev->pending_writes);
a5bf4df0 745 submit_bio(WRITE_FLUSH_FUA, bio);
a9701a30
N		 746}
747
fd01b88c 748void md_super_wait(struct mddev *mddev)
a9701a30 749{
e9c7469b 750 /* wait for all superblock writes that were scheduled to complete */
1967cd56 751 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
7bfa19f2
N		 752}
753
3cb03002 754int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
ccebd4c4 755 struct page *page, int rw, bool metadata_op)
1da177e4 756{
a167f663 757 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
1da177e4
LT		 758 int ret;
759
a6ff7e08
JB		 760 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
761 rdev->meta_bdev : rdev->bdev;
ccebd4c4 762 if (metadata_op)
4f024f37 763 bio->bi_iter.bi_sector = sector + rdev->sb_start;
1fdd6fc9
N		 764 else if (rdev->mddev->reshape_position != MaxSector &&
765 (rdev->mddev->reshape_backwards ==
766 (sector >= rdev->mddev->reshape_position)))
4f024f37 767 bio->bi_iter.bi_sector = sector + rdev->new_data_offset;
ccebd4c4 768 else
4f024f37 769 bio->bi_iter.bi_sector = sector + rdev->data_offset;
1da177e4 770 bio_add_page(bio, page, size, 0);
c170bbb4 771 submit_bio_wait(rw, bio);
1da177e4 772
4246a0b6 773 ret = !bio->bi_error;
1da177e4
LT		 774 bio_put(bio);
775 return ret;
776}
a8745db2 777EXPORT_SYMBOL_GPL(sync_page_io);
1da177e4 778
f72ffdd6 779static int read_disk_sb(struct md_rdev *rdev, int size)
1da177e4
LT		 780{
781 char b[BDEVNAME_SIZE];
403df478 782
1da177e4
LT		 783 if (rdev->sb_loaded)
784 return 0;
785
ccebd4c4 786 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
1da177e4
LT		 787 goto fail;
788 rdev->sb_loaded = 1;
789 return 0;
790
791fail:
792 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
793 bdevname(rdev->bdev,b));
794 return -EINVAL;
795}
796
797static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
798{
f72ffdd6 799 return sb1->set_uuid0 == sb2->set_uuid0 &&
05710466
AN		 800 sb1->set_uuid1 == sb2->set_uuid1 &&
801 sb1->set_uuid2 == sb2->set_uuid2 &&
802 sb1->set_uuid3 == sb2->set_uuid3;
1da177e4
LT		 803}
804
1da177e4
LT		 805static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
806{
807 int ret;
808 mdp_super_t *tmp1, *tmp2;
809
810 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
811 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
812
813 if (!tmp1 || !tmp2) {
814 ret = 0;
35020f1a 815 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
1da177e4
LT		 816 goto abort;
817 }
818
819 *tmp1 = *sb1;
820 *tmp2 = *sb2;
821
822 /*
823 * nr_disks is not constant
824 */
825 tmp1->nr_disks = 0;
826 tmp2->nr_disks = 0;
827
ce0c8e05 828 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
1da177e4 829abort:
990a8baf
JJ		 830 kfree(tmp1);
831 kfree(tmp2);
1da177e4
LT		 832 return ret;
833}
834
4d167f09
N		 835static u32 md_csum_fold(u32 csum)
836{
837 csum = (csum & 0xffff) + (csum >> 16);
838 return (csum & 0xffff) + (csum >> 16);
839}
840
f72ffdd6 841static unsigned int calc_sb_csum(mdp_super_t *sb)
1da177e4 842{
4d167f09
N		 843 u64 newcsum = 0;
844 u32 *sb32 = (u32*)sb;
845 int i;
1da177e4
LT		 846 unsigned int disk_csum, csum;
847
848 disk_csum = sb->sb_csum;
849 sb->sb_csum = 0;
4d167f09
N		 850
851 for (i = 0; i < MD_SB_BYTES/4 ; i++)
852 newcsum += sb32[i];
853 csum = (newcsum & 0xffffffff) + (newcsum>>32);
854
4d167f09
N		 855#ifdef CONFIG_ALPHA
856 /* This used to use csum_partial, which was wrong for several
857 * reasons including that different results are returned on
858 * different architectures. It isn't critical that we get exactly
859 * the same return value as before (we always csum_fold before
860 * testing, and that removes any differences). However as we
861 * know that csum_partial always returned a 16bit value on
862 * alphas, do a fold to maximise conformity to previous behaviour.
863 */
864 sb->sb_csum = md_csum_fold(disk_csum);
865#else
1da177e4 866 sb->sb_csum = disk_csum;
4d167f09 867#endif
1da177e4
LT		 868 return csum;
869}
870
1da177e4
LT		 871/*
872 * Handle superblock details.
873 * We want to be able to handle multiple superblock formats
874 * so we have a common interface to them all, and an array of
875 * different handlers.
876 * We rely on user-space to write the initial superblock, and support
877 * reading and updating of superblocks.
878 * Interface methods are:
3cb03002 879 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1da177e4
LT		 880 * loads and validates a superblock on dev.
881 * if refdev != NULL, compare superblocks on both devices
882 * Return:
883 * 0 - dev has a superblock that is compatible with refdev
884 * 1 - dev has a superblock that is compatible and newer than refdev
885 * so dev should be used as the refdev in future
886 * -EINVAL superblock incompatible or invalid
887 * -othererror e.g. -EIO
888 *
fd01b88c 889 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1da177e4
LT		 890 * Verify that dev is acceptable into mddev.
891 * The first time, mddev->raid_disks will be 0, and data from
892 * dev should be merged in. Subsequent calls check that dev
893 * is new enough. Return 0 or -EINVAL
894 *
fd01b88c 895 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1da177e4
LT		 896 * Update the superblock for rdev with data in mddev
897 * This does not write to disc.
898 *
899 */
900
901struct super_type {
0cd17fec
CW		 902 char *name;
903 struct module *owner;
c6563a8c
N		 904 int (*load_super)(struct md_rdev *rdev,
905 struct md_rdev *refdev,
0cd17fec 906 int minor_version);
c6563a8c
N		 907 int (*validate_super)(struct mddev *mddev,
908 struct md_rdev *rdev);
909 void (*sync_super)(struct mddev *mddev,
910 struct md_rdev *rdev);
3cb03002 911 unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
15f4a5fd 912 sector_t num_sectors);
c6563a8c
N		 913 int (*allow_new_offset)(struct md_rdev *rdev,
914 unsigned long long new_offset);
1da177e4
LT		 915};
916
0894cc30
AN		 917/*
918 * Check that the given mddev has no bitmap.
919 *
920 * This function is called from the run method of all personalities that do not
921 * support bitmaps. It prints an error message and returns non-zero if mddev
922 * has a bitmap. Otherwise, it returns 0.
923 *
924 */
fd01b88c 925int md_check_no_bitmap(struct mddev *mddev)
0894cc30 926{
c3d9714e 927 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
0894cc30
AN		 928 return 0;
929 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
930 mdname(mddev), mddev->pers->name);
931 return 1;
932}
933EXPORT_SYMBOL(md_check_no_bitmap);
934
1da177e4 935/*
f72ffdd6 936 * load_super for 0.90.0
1da177e4 937 */
3cb03002 938static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1da177e4
LT		 939{
940 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
941 mdp_super_t *sb;
942 int ret;
1da177e4
LT		 943
944 /*
0f420358 945 * Calculate the position of the superblock (512byte sectors),
1da177e4
LT		 946 * it's at the end of the disk.
947 *
948 * It also happens to be a multiple of 4Kb.
949 */
57b2caa3 950 rdev->sb_start = calc_dev_sboffset(rdev);
1da177e4 951
0002b271 952 ret = read_disk_sb(rdev, MD_SB_BYTES);
1da177e4
LT		 953 if (ret) return ret;
954
955 ret = -EINVAL;
956
957 bdevname(rdev->bdev, b);
65a06f06 958 sb = page_address(rdev->sb_page);
1da177e4
LT		 959
960 if (sb->md_magic != MD_SB_MAGIC) {
961 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
962 b);
963 goto abort;
964 }
965
966 if (sb->major_version != 0 ||
f6705578
N		 967 sb->minor_version < 90 ||
968 sb->minor_version > 91) {
1da177e4
LT		 969 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
970 sb->major_version, sb->minor_version,
971 b);
972 goto abort;
973 }
974
975 if (sb->raid_disks <= 0)
976 goto abort;
977
4d167f09 978 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
1da177e4
LT		 979 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
980 b);
981 goto abort;
982 }
983
984 rdev->preferred_minor = sb->md_minor;
985 rdev->data_offset = 0;
c6563a8c 986 rdev->new_data_offset = 0;
0002b271 987 rdev->sb_size = MD_SB_BYTES;
9f2f3830 988 rdev->badblocks.shift = -1;
1da177e4
LT		 989
990 if (sb->level == LEVEL_MULTIPATH)
991 rdev->desc_nr = -1;
992 else
993 rdev->desc_nr = sb->this_disk.number;
994
9a7b2b0f 995 if (!refdev) {
1da177e4 996 ret = 1;
9a7b2b0f 997 } else {
1da177e4 998 __u64 ev1, ev2;
65a06f06 999 mdp_super_t *refsb = page_address(refdev->sb_page);
1da177e4
LT		 1000 if (!uuid_equal(refsb, sb)) {
1001 printk(KERN_WARNING "md: %s has different UUID to %s\n",
1002 b, bdevname(refdev->bdev,b2));
1003 goto abort;
1004 }
1005 if (!sb_equal(refsb, sb)) {
1006 printk(KERN_WARNING "md: %s has same UUID"
1007 " but different superblock to %s\n",
1008 b, bdevname(refdev->bdev, b2));
1009 goto abort;
1010 }
1011 ev1 = md_event(sb);
1012 ev2 = md_event(refsb);
1013 if (ev1 > ev2)
1014 ret = 1;
f72ffdd6 1015 else
1da177e4
LT		 1016 ret = 0;
1017 }
8190e754 1018 rdev->sectors = rdev->sb_start;
667a5313
N		 1019 /* Limit to 4TB as metadata cannot record more than that.
1020 * (not needed for Linear and RAID0 as metadata doesn't
1021 * record this size)
1022 */
3312c951
AB		 1023 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
1024 sb->level >= 1)
1025 rdev->sectors = (sector_t)(2ULL << 32) - 2;
1da177e4 1026
27a7b260 1027 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
2bf071bf
N		 1028 /* "this cannot possibly happen" ... */
1029 ret = -EINVAL;
1030
1da177e4
LT		 1031 abort:
1032 return ret;
1033}
1034
1035/*
1036 * validate_super for 0.90.0
1037 */
fd01b88c 1038static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
1da177e4
LT		 1039{
1040 mdp_disk_t *desc;
65a06f06 1041 mdp_super_t *sb = page_address(rdev->sb_page);
07d84d10 1042 __u64 ev1 = md_event(sb);
1da177e4 1043
41158c7e 1044 rdev->raid_disk = -1;
c5d79adb
N		 1045 clear_bit(Faulty, &rdev->flags);
1046 clear_bit(In_sync, &rdev->flags);
8313b8e5 1047 clear_bit(Bitmap_sync, &rdev->flags);
c5d79adb 1048 clear_bit(WriteMostly, &rdev->flags);
c5d79adb 1049
1da177e4
LT		 1050 if (mddev->raid_disks == 0) {
1051 mddev->major_version = 0;
1052 mddev->minor_version = sb->minor_version;
1053 mddev->patch_version = sb->patch_version;
e691063a 1054 mddev->external = 0;
9d8f0363 1055 mddev->chunk_sectors = sb->chunk_size >> 9;
1da177e4
LT		 1056 mddev->ctime = sb->ctime;
1057 mddev->utime = sb->utime;
1058 mddev->level = sb->level;
d9d166c2 1059 mddev->clevel[0] = 0;
1da177e4
LT		 1060 mddev->layout = sb->layout;
1061 mddev->raid_disks = sb->raid_disks;
27a7b260 1062 mddev->dev_sectors = ((sector_t)sb->size) * 2;
07d84d10 1063 mddev->events = ev1;
c3d9714e 1064 mddev->bitmap_info.offset = 0;
6409bb05
N		 1065 mddev->bitmap_info.space = 0;
1066 /* bitmap can use 60 K after the 4K superblocks */
c3d9714e 1067 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6409bb05 1068 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
2c810cdd 1069 mddev->reshape_backwards = 0;
1da177e4 1070
f6705578
N		 1071 if (mddev->minor_version >= 91) {
1072 mddev->reshape_position = sb->reshape_position;
1073 mddev->delta_disks = sb->delta_disks;
1074 mddev->new_level = sb->new_level;
1075 mddev->new_layout = sb->new_layout;
664e7c41 1076 mddev->new_chunk_sectors = sb->new_chunk >> 9;
2c810cdd
N		 1077 if (mddev->delta_disks < 0)
1078 mddev->reshape_backwards = 1;
f6705578
N		 1079 } else {
1080 mddev->reshape_position = MaxSector;
1081 mddev->delta_disks = 0;
1082 mddev->new_level = mddev->level;
1083 mddev->new_layout = mddev->layout;
664e7c41 1084 mddev->new_chunk_sectors = mddev->chunk_sectors;
f6705578
N		 1085 }
1086
1da177e4
LT		 1087 if (sb->state & (1<<MD_SB_CLEAN))
1088 mddev->recovery_cp = MaxSector;
1089 else {
f72ffdd6 1090 if (sb->events_hi == sb->cp_events_hi &&
1da177e4
LT		 1091 sb->events_lo == sb->cp_events_lo) {
1092 mddev->recovery_cp = sb->recovery_cp;
1093 } else
1094 mddev->recovery_cp = 0;
1095 }
1096
1097 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1098 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1099 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1100 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1101
1102 mddev->max_disks = MD_SB_DISKS;
a654b9d8
N		 1103
1104 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
6409bb05 1105 mddev->bitmap_info.file == NULL) {
c3d9714e
N		 1106 mddev->bitmap_info.offset =
1107 mddev->bitmap_info.default_offset;
6409bb05 1108 mddev->bitmap_info.space =
c9ad020f 1109 mddev->bitmap_info.default_space;
6409bb05 1110 }
a654b9d8 1111
41158c7e 1112 } else if (mddev->pers == NULL) {
be6800a7
N		 1113 /* Insist on good event counter while assembling, except
1114 * for spares (which don't need an event count) */
1da177e4 1115 ++ev1;
be6800a7
N		 1116 if (sb->disks[rdev->desc_nr].state & (
1117 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
f72ffdd6 1118 if (ev1 < mddev->events)
be6800a7 1119 return -EINVAL;
41158c7e
N		 1120 } else if (mddev->bitmap) {
1121 /* if adding to array with a bitmap, then we can accept an
1122 * older device ... but not too old.
1123 */
41158c7e
N		 1124 if (ev1 < mddev->bitmap->events_cleared)
1125 return 0;
8313b8e5
N		 1126 if (ev1 < mddev->events)
1127 set_bit(Bitmap_sync, &rdev->flags);
07d84d10
N		 1128 } else {
1129 if (ev1 < mddev->events)
1130 /* just a hot-add of a new device, leave raid_disk at -1 */
1131 return 0;
1132 }
41158c7e 1133
1da177e4 1134 if (mddev->level != LEVEL_MULTIPATH) {
1da177e4
LT		 1135 desc = sb->disks + rdev->desc_nr;
1136
1137 if (desc->state & (1<<MD_DISK_FAULTY))
b2d444d7 1138 set_bit(Faulty, &rdev->flags);
7c7546cc
N		 1139 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1140 desc->raid_disk < mddev->raid_disks */) {
b2d444d7 1141 set_bit(In_sync, &rdev->flags);
1da177e4 1142 rdev->raid_disk = desc->raid_disk;
f466722c 1143 rdev->saved_raid_disk = desc->raid_disk;
0261cd9f
N		 1144 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1145 /* active but not in sync implies recovery up to
1146 * reshape position. We don't know exactly where
1147 * that is, so set to zero for now */
1148 if (mddev->minor_version >= 91) {
1149 rdev->recovery_offset = 0;
1150 rdev->raid_disk = desc->raid_disk;
1151 }
1da177e4 1152 }
8ddf9efe
N		 1153 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1154 set_bit(WriteMostly, &rdev->flags);
41158c7e 1155 } else /* MULTIPATH are always insync */
b2d444d7 1156 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1157 return 0;
1158}
1159
1160/*
1161 * sync_super for 0.90.0
1162 */
fd01b88c 1163static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
1da177e4
LT		 1164{
1165 mdp_super_t *sb;
3cb03002 1166 struct md_rdev *rdev2;
1da177e4 1167 int next_spare = mddev->raid_disks;
19133a42 1168
1da177e4
LT		 1169 /* make rdev->sb match mddev data..
1170 *
1171 * 1/ zero out disks
1172 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1173 * 3/ any empty disks < next_spare become removed
1174 *
1175 * disks[0] gets initialised to REMOVED because
1176 * we cannot be sure from other fields if it has
1177 * been initialised or not.
1178 */
1179 int i;
1180 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1181
61181565
N		 1182 rdev->sb_size = MD_SB_BYTES;
1183
65a06f06 1184 sb = page_address(rdev->sb_page);
1da177e4
LT		 1185
1186 memset(sb, 0, sizeof(*sb));
1187
1188 sb->md_magic = MD_SB_MAGIC;
1189 sb->major_version = mddev->major_version;
1da177e4
LT		 1190 sb->patch_version = mddev->patch_version;
1191 sb->gvalid_words = 0; /* ignored */
1192 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1193 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1194 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1195 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1196
9ebc6ef1 1197 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1da177e4 1198 sb->level = mddev->level;
58c0fed4 1199 sb->size = mddev->dev_sectors / 2;
1da177e4
LT		 1200 sb->raid_disks = mddev->raid_disks;
1201 sb->md_minor = mddev->md_minor;
e691063a 1202 sb->not_persistent = 0;
9ebc6ef1 1203 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1da177e4
LT		 1204 sb->state = 0;
1205 sb->events_hi = (mddev->events>>32);
1206 sb->events_lo = (u32)mddev->events;
1207
f6705578
N		 1208 if (mddev->reshape_position == MaxSector)
1209 sb->minor_version = 90;
1210 else {
1211 sb->minor_version = 91;
1212 sb->reshape_position = mddev->reshape_position;
1213 sb->new_level = mddev->new_level;
1214 sb->delta_disks = mddev->delta_disks;
1215 sb->new_layout = mddev->new_layout;
664e7c41 1216 sb->new_chunk = mddev->new_chunk_sectors << 9;
f6705578
N		 1217 }
1218 mddev->minor_version = sb->minor_version;
1da177e4
LT		 1219 if (mddev->in_sync)
1220 {
1221 sb->recovery_cp = mddev->recovery_cp;
1222 sb->cp_events_hi = (mddev->events>>32);
1223 sb->cp_events_lo = (u32)mddev->events;
1224 if (mddev->recovery_cp == MaxSector)
1225 sb->state = (1<< MD_SB_CLEAN);
1226 } else
1227 sb->recovery_cp = 0;
1228
1229 sb->layout = mddev->layout;
9d8f0363 1230 sb->chunk_size = mddev->chunk_sectors << 9;
1da177e4 1231
c3d9714e 1232 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
a654b9d8
N		 1233 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1234
1da177e4 1235 sb->disks[0].state = (1<<MD_DISK_REMOVED);
dafb20fa 1236 rdev_for_each(rdev2, mddev) {
1da177e4 1237 mdp_disk_t *d;
86e6ffdd 1238 int desc_nr;
0261cd9f
N		 1239 int is_active = test_bit(In_sync, &rdev2->flags);
1240
1241 if (rdev2->raid_disk >= 0 &&
1242 sb->minor_version >= 91)
1243 /* we have nowhere to store the recovery_offset,
1244 * but if it is not below the reshape_position,
1245 * we can piggy-back on that.
1246 */
1247 is_active = 1;
1248 if (rdev2->raid_disk < 0 ||
1249 test_bit(Faulty, &rdev2->flags))
1250 is_active = 0;
1251 if (is_active)
86e6ffdd 1252 desc_nr = rdev2->raid_disk;
1da177e4 1253 else
86e6ffdd 1254 desc_nr = next_spare++;
19133a42 1255 rdev2->desc_nr = desc_nr;
1da177e4
LT		 1256 d = &sb->disks[rdev2->desc_nr];
1257 nr_disks++;
1258 d->number = rdev2->desc_nr;
1259 d->major = MAJOR(rdev2->bdev->bd_dev);
1260 d->minor = MINOR(rdev2->bdev->bd_dev);
0261cd9f 1261 if (is_active)
1da177e4
LT		 1262 d->raid_disk = rdev2->raid_disk;
1263 else
1264 d->raid_disk = rdev2->desc_nr; /* compatibility */
1be7892f 1265 if (test_bit(Faulty, &rdev2->flags))
1da177e4 1266 d->state = (1<<MD_DISK_FAULTY);
0261cd9f 1267 else if (is_active) {
1da177e4 1268 d->state = (1<<MD_DISK_ACTIVE);
0261cd9f
N		 1269 if (test_bit(In_sync, &rdev2->flags))
1270 d->state |= (1<<MD_DISK_SYNC);
1da177e4
LT		 1271 active++;
1272 working++;
1273 } else {
1274 d->state = 0;
1275 spare++;
1276 working++;
1277 }
8ddf9efe
N		 1278 if (test_bit(WriteMostly, &rdev2->flags))
1279 d->state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4 1280 }
1da177e4
LT		 1281 /* now set the "removed" and "faulty" bits on any missing devices */
1282 for (i=0 ; i < mddev->raid_disks ; i++) {
1283 mdp_disk_t *d = &sb->disks[i];
1284 if (d->state == 0 && d->number == 0) {
1285 d->number = i;
1286 d->raid_disk = i;
1287 d->state = (1<<MD_DISK_REMOVED);
1288 d->state |= (1<<MD_DISK_FAULTY);
1289 failed++;
1290 }
1291 }
1292 sb->nr_disks = nr_disks;
1293 sb->active_disks = active;
1294 sb->working_disks = working;
1295 sb->failed_disks = failed;
1296 sb->spare_disks = spare;
1297
1298 sb->this_disk = sb->disks[rdev->desc_nr];
1299 sb->sb_csum = calc_sb_csum(sb);
1300}
1301
0cd17fec
CW		 1302/*
1303 * rdev_size_change for 0.90.0
1304 */
1305static unsigned long long
3cb03002 1306super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
0cd17fec 1307{
58c0fed4 1308 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
0cd17fec 1309 return 0; /* component must fit device */
c3d9714e 1310 if (rdev->mddev->bitmap_info.offset)
0cd17fec 1311 return 0; /* can't move bitmap */
57b2caa3 1312 rdev->sb_start = calc_dev_sboffset(rdev);
15f4a5fd
AN		 1313 if (!num_sectors || num_sectors > rdev->sb_start)
1314 num_sectors = rdev->sb_start;
27a7b260
N		 1315 /* Limit to 4TB as metadata cannot record more than that.
1316 * 4TB == 2^32 KB, or 2*2^32 sectors.
1317 */
3312c951
AB		 1318 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
1319 rdev->mddev->level >= 1)
1320 num_sectors = (sector_t)(2ULL << 32) - 2;
0f420358 1321 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
0cd17fec
CW		 1322 rdev->sb_page);
1323 md_super_wait(rdev->mddev);
c26a44ed 1324 return num_sectors;
0cd17fec
CW		 1325}
1326
c6563a8c
N		 1327static int
1328super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
1329{
1330 /* non-zero offset changes not possible with v0.90 */
1331 return new_offset == 0;
1332}
0cd17fec 1333
1da177e4
LT		 1334/*
1335 * version 1 superblock
1336 */
1337
f72ffdd6 1338static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb)
1da177e4 1339{
1c05b4bc
N		 1340 __le32 disk_csum;
1341 u32 csum;
1da177e4
LT		 1342 unsigned long long newcsum;
1343 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1c05b4bc 1344 __le32 *isuper = (__le32*)sb;
1da177e4
LT		 1345
1346 disk_csum = sb->sb_csum;
1347 sb->sb_csum = 0;
1348 newcsum = 0;
1f3c9907 1349 for (; size >= 4; size -= 4)
1da177e4
LT		 1350 newcsum += le32_to_cpu(*isuper++);
1351
1352 if (size == 2)
1c05b4bc 1353 newcsum += le16_to_cpu(*(__le16*) isuper);
1da177e4
LT		 1354
1355 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1356 sb->sb_csum = disk_csum;
1357 return cpu_to_le32(csum);
1358}
1359
3cb03002 1360static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
1da177e4
LT		 1361{
1362 struct mdp_superblock_1 *sb;
1363 int ret;
0f420358 1364 sector_t sb_start;
c6563a8c 1365 sector_t sectors;
1da177e4 1366 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
0002b271 1367 int bmask;
1da177e4
LT		 1368
1369 /*
0f420358 1370 * Calculate the position of the superblock in 512byte sectors.
1da177e4
LT		 1371 * It is always aligned to a 4K boundary and
1372 * depeding on minor_version, it can be:
1373 * 0: At least 8K, but less than 12K, from end of device
1374 * 1: At start of device
1375 * 2: 4K from start of device.
1376 */
1377 switch(minor_version) {
1378 case 0:
77304d2a 1379 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
0f420358
AN		 1380 sb_start -= 8*2;
1381 sb_start &= ~(sector_t)(4*2-1);
1da177e4
LT		 1382 break;
1383 case 1:
0f420358 1384 sb_start = 0;
1da177e4
LT		 1385 break;
1386 case 2:
0f420358 1387 sb_start = 8;
1da177e4
LT		 1388 break;
1389 default:
1390 return -EINVAL;
1391 }
0f420358 1392 rdev->sb_start = sb_start;
1da177e4 1393
0002b271
N		 1394 /* superblock is rarely larger than 1K, but it can be larger,
1395 * and it is safe to read 4k, so we do that
1396 */
1397 ret = read_disk_sb(rdev, 4096);
1da177e4
LT		 1398 if (ret) return ret;
1399
65a06f06 1400 sb = page_address(rdev->sb_page);
1da177e4
LT		 1401
1402 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1403 sb->major_version != cpu_to_le32(1) ||
1404 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
0f420358 1405 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
71c0805c 1406 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1da177e4
LT		 1407 return -EINVAL;
1408
1409 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1410 printk("md: invalid superblock checksum on %s\n",
1411 bdevname(rdev->bdev,b));
1412 return -EINVAL;
1413 }
1414 if (le64_to_cpu(sb->data_size) < 10) {
1415 printk("md: data_size too small on %s\n",
1416 bdevname(rdev->bdev,b));
1417 return -EINVAL;
1418 }
c6563a8c
N		 1419 if (sb->pad0 ||
1420 sb->pad3[0] ||
1421 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
1422 /* Some padding is non-zero, might be a new feature */
1423 return -EINVAL;
e11e93fa 1424
1da177e4
LT		 1425 rdev->preferred_minor = 0xffff;
1426 rdev->data_offset = le64_to_cpu(sb->data_offset);
c6563a8c
N		 1427 rdev->new_data_offset = rdev->data_offset;
1428 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
1429 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
1430 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
4dbcdc75 1431 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1da177e4 1432
0002b271 1433 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
e1defc4f 1434 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
0002b271 1435 if (rdev->sb_size & bmask)
a1801f85
N		 1436 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1437
1438 if (minor_version
0f420358 1439 && rdev->data_offset < sb_start + (rdev->sb_size/512))
a1801f85 1440 return -EINVAL;
c6563a8c
N		 1441 if (minor_version
1442 && rdev->new_data_offset < sb_start + (rdev->sb_size/512))
1443 return -EINVAL;
0002b271 1444
31b65a0d
N		 1445 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1446 rdev->desc_nr = -1;
1447 else
1448 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1449
2699b672
N		 1450 if (!rdev->bb_page) {
1451 rdev->bb_page = alloc_page(GFP_KERNEL);
1452 if (!rdev->bb_page)
1453 return -ENOMEM;
1454 }
1455 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
1456 rdev->badblocks.count == 0) {
1457 /* need to load the bad block list.
1458 * Currently we limit it to one page.
1459 */
1460 s32 offset;
1461 sector_t bb_sector;
1462 u64 *bbp;
1463 int i;
1464 int sectors = le16_to_cpu(sb->bblog_size);
1465 if (sectors > (PAGE_SIZE / 512))
1466 return -EINVAL;
1467 offset = le32_to_cpu(sb->bblog_offset);
1468 if (offset == 0)
1469 return -EINVAL;
1470 bb_sector = (long long)offset;
1471 if (!sync_page_io(rdev, bb_sector, sectors << 9,
1472 rdev->bb_page, READ, true))
1473 return -EIO;
1474 bbp = (u64 *)page_address(rdev->bb_page);
1475 rdev->badblocks.shift = sb->bblog_shift;
1476 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
1477 u64 bb = le64_to_cpu(*bbp);
1478 int count = bb & (0x3ff);
1479 u64 sector = bb >> 10;
1480 sector <<= sb->bblog_shift;
1481 count <<= sb->bblog_shift;
1482 if (bb + 1 == 0)
1483 break;
fc974ee2 1484 if (badblocks_set(&rdev->badblocks, sector, count, 1))
2699b672
N		 1485 return -EINVAL;
1486 }
486adf72
N		 1487 } else if (sb->bblog_offset != 0)
1488 rdev->badblocks.shift = 0;
2699b672 1489
9a7b2b0f 1490 if (!refdev) {
8ed75463 1491 ret = 1;
9a7b2b0f 1492 } else {
1da177e4 1493 __u64 ev1, ev2;
65a06f06 1494 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
1da177e4
LT		 1495
1496 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1497 sb->level != refsb->level ||
1498 sb->layout != refsb->layout ||
1499 sb->chunksize != refsb->chunksize) {
1500 printk(KERN_WARNING "md: %s has strangely different"
1501 " superblock to %s\n",
1502 bdevname(rdev->bdev,b),
1503 bdevname(refdev->bdev,b2));
1504 return -EINVAL;
1505 }
1506 ev1 = le64_to_cpu(sb->events);
1507 ev2 = le64_to_cpu(refsb->events);
1508
1509 if (ev1 > ev2)
8ed75463
N		 1510 ret = 1;
1511 else
1512 ret = 0;
1da177e4 1513 }
c6563a8c
N		 1514 if (minor_version) {
1515 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
1516 sectors -= rdev->data_offset;
1517 } else
1518 sectors = rdev->sb_start;
1519 if (sectors < le64_to_cpu(sb->data_size))
1da177e4 1520 return -EINVAL;
dd8ac336 1521 rdev->sectors = le64_to_cpu(sb->data_size);
8ed75463 1522 return ret;
1da177e4
LT		 1523}
1524
fd01b88c 1525static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
1da177e4 1526{
65a06f06 1527 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
07d84d10 1528 __u64 ev1 = le64_to_cpu(sb->events);
1da177e4 1529
41158c7e 1530 rdev->raid_disk = -1;
c5d79adb
N		 1531 clear_bit(Faulty, &rdev->flags);
1532 clear_bit(In_sync, &rdev->flags);
8313b8e5 1533 clear_bit(Bitmap_sync, &rdev->flags);
c5d79adb 1534 clear_bit(WriteMostly, &rdev->flags);
c5d79adb 1535
1da177e4
LT		 1536 if (mddev->raid_disks == 0) {
1537 mddev->major_version = 1;
1538 mddev->patch_version = 0;
e691063a 1539 mddev->external = 0;
9d8f0363 1540 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
9ebc6ef1
DD		 1541 mddev->ctime = le64_to_cpu(sb->ctime);
1542 mddev->utime = le64_to_cpu(sb->utime);
1da177e4 1543 mddev->level = le32_to_cpu(sb->level);
d9d166c2 1544 mddev->clevel[0] = 0;
1da177e4
LT		 1545 mddev->layout = le32_to_cpu(sb->layout);
1546 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
58c0fed4 1547 mddev->dev_sectors = le64_to_cpu(sb->size);
07d84d10 1548 mddev->events = ev1;
c3d9714e 1549 mddev->bitmap_info.offset = 0;
6409bb05
N		 1550 mddev->bitmap_info.space = 0;
1551 /* Default location for bitmap is 1K after superblock
1552 * using 3K - total of 4K
1553 */
c3d9714e 1554 mddev->bitmap_info.default_offset = 1024 >> 9;
6409bb05 1555 mddev->bitmap_info.default_space = (4096-1024) >> 9;
2c810cdd
N		 1556 mddev->reshape_backwards = 0;
1557
1da177e4
LT		 1558 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1559 memcpy(mddev->uuid, sb->set_uuid, 16);
1560
1561 mddev->max_disks = (4096-256)/2;
a654b9d8 1562
71c0805c 1563 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
6409bb05 1564 mddev->bitmap_info.file == NULL) {
c3d9714e
N		 1565 mddev->bitmap_info.offset =
1566 (__s32)le32_to_cpu(sb->bitmap_offset);
6409bb05
N		 1567 /* Metadata doesn't record how much space is available.
1568 * For 1.0, we assume we can use up to the superblock
1569 * if before, else to 4K beyond superblock.
1570 * For others, assume no change is possible.
1571 */
1572 if (mddev->minor_version > 0)
1573 mddev->bitmap_info.space = 0;
1574 else if (mddev->bitmap_info.offset > 0)
1575 mddev->bitmap_info.space =
1576 8 - mddev->bitmap_info.offset;
1577 else
1578 mddev->bitmap_info.space =
1579 -mddev->bitmap_info.offset;
1580 }
e11e93fa 1581
f6705578
N		 1582 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1583 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1584 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1585 mddev->new_level = le32_to_cpu(sb->new_level);
1586 mddev->new_layout = le32_to_cpu(sb->new_layout);
664e7c41 1587 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
2c810cdd
N		 1588 if (mddev->delta_disks < 0 ||
1589 (mddev->delta_disks == 0 &&
1590 (le32_to_cpu(sb->feature_map)
1591 & MD_FEATURE_RESHAPE_BACKWARDS)))
1592 mddev->reshape_backwards = 1;
f6705578
N		 1593 } else {
1594 mddev->reshape_position = MaxSector;
1595 mddev->delta_disks = 0;
1596 mddev->new_level = mddev->level;
1597 mddev->new_layout = mddev->layout;
664e7c41 1598 mddev->new_chunk_sectors = mddev->chunk_sectors;
f6705578
N		 1599 }
1600
a62ab49e
SL		 1601 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) {
1602 set_bit(MD_HAS_JOURNAL, &mddev->flags);
1603 if (mddev->recovery_cp == MaxSector)
1604 set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
1605 }
41158c7e 1606 } else if (mddev->pers == NULL) {
be6800a7
N		 1607 /* Insist of good event counter while assembling, except for
1608 * spares (which don't need an event count) */
1da177e4 1609 ++ev1;
be6800a7
N		 1610 if (rdev->desc_nr >= 0 &&
1611 rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
a3dfbdaa
SL		 1612 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
1613 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
be6800a7
N		 1614 if (ev1 < mddev->events)
1615 return -EINVAL;
41158c7e
N		 1616 } else if (mddev->bitmap) {
1617 /* If adding to array with a bitmap, then we can accept an
1618 * older device, but not too old.
1619 */
41158c7e
N		 1620 if (ev1 < mddev->bitmap->events_cleared)
1621 return 0;
8313b8e5
N		 1622 if (ev1 < mddev->events)
1623 set_bit(Bitmap_sync, &rdev->flags);
07d84d10
N		 1624 } else {
1625 if (ev1 < mddev->events)
1626 /* just a hot-add of a new device, leave raid_disk at -1 */
1627 return 0;
1628 }
1da177e4
LT		 1629 if (mddev->level != LEVEL_MULTIPATH) {
1630 int role;
3673f305
N		 1631 if (rdev->desc_nr < 0 ||
1632 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
c4d4c91b 1633 role = MD_DISK_ROLE_SPARE;
3673f305
N		 1634 rdev->desc_nr = -1;
1635 } else
1636 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1da177e4 1637 switch(role) {
c4d4c91b 1638 case MD_DISK_ROLE_SPARE: /* spare */
1da177e4 1639 break;
c4d4c91b 1640 case MD_DISK_ROLE_FAULTY: /* faulty */
b2d444d7 1641 set_bit(Faulty, &rdev->flags);
1da177e4 1642 break;
bac624f3
SL		 1643 case MD_DISK_ROLE_JOURNAL: /* journal device */
1644 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
1645 /* journal device without journal feature */
1646 printk(KERN_WARNING
1647 "md: journal device provided without journal feature, ignoring the device\n");
1648 return -EINVAL;
1649 }
1650 set_bit(Journal, &rdev->flags);
3069aa8d 1651 rdev->journal_tail = le64_to_cpu(sb->journal_tail);
9b15603d 1652 rdev->raid_disk = 0;
bac624f3 1653 break;
1da177e4 1654 default:
f466722c 1655 rdev->saved_raid_disk = role;
5fd6c1dc 1656 if ((le32_to_cpu(sb->feature_map) &
f466722c 1657 MD_FEATURE_RECOVERY_OFFSET)) {
5fd6c1dc 1658 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
f466722c
N		 1659 if (!(le32_to_cpu(sb->feature_map) &
1660 MD_FEATURE_RECOVERY_BITMAP))
1661 rdev->saved_raid_disk = -1;
1662 } else
5fd6c1dc 1663 set_bit(In_sync, &rdev->flags);
1da177e4
LT		 1664 rdev->raid_disk = role;
1665 break;
1666 }
8ddf9efe
N		 1667 if (sb->devflags & WriteMostly1)
1668 set_bit(WriteMostly, &rdev->flags);
2d78f8c4
N		 1669 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
1670 set_bit(Replacement, &rdev->flags);
41158c7e 1671 } else /* MULTIPATH are always insync */
b2d444d7 1672 set_bit(In_sync, &rdev->flags);
41158c7e 1673
1da177e4
LT		 1674 return 0;
1675}
1676
fd01b88c 1677static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
1da177e4
LT		 1678{
1679 struct mdp_superblock_1 *sb;
3cb03002 1680 struct md_rdev *rdev2;
1da177e4
LT		 1681 int max_dev, i;
1682 /* make rdev->sb match mddev and rdev data. */
1683
65a06f06 1684 sb = page_address(rdev->sb_page);
1da177e4
LT		 1685
1686 sb->feature_map = 0;
1687 sb->pad0 = 0;
5fd6c1dc 1688 sb->recovery_offset = cpu_to_le64(0);
1da177e4
LT		 1689 memset(sb->pad3, 0, sizeof(sb->pad3));
1690
1691 sb->utime = cpu_to_le64((__u64)mddev->utime);
1692 sb->events = cpu_to_le64(mddev->events);
1693 if (mddev->in_sync)
1694 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
bd18f646
SL		 1695 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))
1696 sb->resync_offset = cpu_to_le64(MaxSector);
1da177e4
LT		 1697 else
1698 sb->resync_offset = cpu_to_le64(0);
1699
1c05b4bc 1700 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
4dbcdc75 1701
f0ca340c 1702 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
58c0fed4 1703 sb->size = cpu_to_le64(mddev->dev_sectors);
9d8f0363 1704 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
62e1e389
N		 1705 sb->level = cpu_to_le32(mddev->level);
1706 sb->layout = cpu_to_le32(mddev->layout);
f0ca340c 1707
aeb9b211
N		 1708 if (test_bit(WriteMostly, &rdev->flags))
1709 sb->devflags |= WriteMostly1;
1710 else
1711 sb->devflags &= ~WriteMostly1;
c6563a8c
N		 1712 sb->data_offset = cpu_to_le64(rdev->data_offset);
1713 sb->data_size = cpu_to_le64(rdev->sectors);
aeb9b211 1714
c3d9714e
N		 1715 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1716 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
71c0805c 1717 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
a654b9d8 1718 }
5fd6c1dc 1719
f2076e7d 1720 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) &&
97e4f42d 1721 !test_bit(In_sync, &rdev->flags)) {
93be75ff
N		 1722 sb->feature_map |=
1723 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1724 sb->recovery_offset =
1725 cpu_to_le64(rdev->recovery_offset);
f466722c
N		 1726 if (rdev->saved_raid_disk >= 0 && mddev->bitmap)
1727 sb->feature_map |=
1728 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP);
5fd6c1dc 1729 }
3069aa8d
SL		 1730 /* Note: recovery_offset and journal_tail share space */
1731 if (test_bit(Journal, &rdev->flags))
1732 sb->journal_tail = cpu_to_le64(rdev->journal_tail);
2d78f8c4
N		 1733 if (test_bit(Replacement, &rdev->flags))
1734 sb->feature_map |=
1735 cpu_to_le32(MD_FEATURE_REPLACEMENT);
5fd6c1dc 1736
f6705578
N		 1737 if (mddev->reshape_position != MaxSector) {
1738 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1739 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1740 sb->new_layout = cpu_to_le32(mddev->new_layout);
1741 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1742 sb->new_level = cpu_to_le32(mddev->new_level);
664e7c41 1743 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
2c810cdd
N		 1744 if (mddev->delta_disks == 0 &&
1745 mddev->reshape_backwards)
1746 sb->feature_map
1747 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
c6563a8c
N		 1748 if (rdev->new_data_offset != rdev->data_offset) {
1749 sb->feature_map
1750 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
1751 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
1752 - rdev->data_offset));
1753 }
f6705578 1754 }
a654b9d8 1755
3c462c88
GR		 1756 if (mddev_is_clustered(mddev))
1757 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED);
1758
2699b672
N		 1759 if (rdev->badblocks.count == 0)
1760 /* Nothing to do for bad blocks*/ ;
1761 else if (sb->bblog_offset == 0)
1762 /* Cannot record bad blocks on this device */
1763 md_error(mddev, rdev);
1764 else {
1765 struct badblocks *bb = &rdev->badblocks;
1766 u64 *bbp = (u64 *)page_address(rdev->bb_page);
1767 u64 *p = bb->page;
1768 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
1769 if (bb->changed) {
1770 unsigned seq;
1771
1772retry:
1773 seq = read_seqbegin(&bb->lock);
1774
1775 memset(bbp, 0xff, PAGE_SIZE);
1776
1777 for (i = 0 ; i < bb->count ; i++) {
35f9ac2d 1778 u64 internal_bb = p[i];
2699b672
N		 1779 u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
1780 | BB_LEN(internal_bb));
35f9ac2d 1781 bbp[i] = cpu_to_le64(store_bb);
2699b672 1782 }
d0962936 1783 bb->changed = 0;
2699b672
N		 1784 if (read_seqretry(&bb->lock, seq))
1785 goto retry;
1786
1787 bb->sector = (rdev->sb_start +
1788 (int)le32_to_cpu(sb->bblog_offset));
1789 bb->size = le16_to_cpu(sb->bblog_size);
2699b672
N		 1790 }
1791 }
1792
1da177e4 1793 max_dev = 0;
dafb20fa 1794 rdev_for_each(rdev2, mddev)
1da177e4
LT		 1795 if (rdev2->desc_nr+1 > max_dev)
1796 max_dev = rdev2->desc_nr+1;
a778b73f 1797
70471daf
N		 1798 if (max_dev > le32_to_cpu(sb->max_dev)) {
1799 int bmask;
a778b73f 1800 sb->max_dev = cpu_to_le32(max_dev);
70471daf
N		 1801 rdev->sb_size = max_dev * 2 + 256;
1802 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1803 if (rdev->sb_size & bmask)
1804 rdev->sb_size = (rdev->sb_size | bmask) + 1;
ddcf3522
N		 1805 } else
1806 max_dev = le32_to_cpu(sb->max_dev);
1807
1da177e4 1808 for (i=0; i<max_dev;i++)
c4d4c91b 1809 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
f72ffdd6 1810
a97b7896
SL		 1811 if (test_bit(MD_HAS_JOURNAL, &mddev->flags))
1812 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
f72ffdd6 1813
dafb20fa 1814 rdev_for_each(rdev2, mddev) {
1da177e4 1815 i = rdev2->desc_nr;
b2d444d7 1816 if (test_bit(Faulty, &rdev2->flags))
c4d4c91b 1817 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
b2d444d7 1818 else if (test_bit(In_sync, &rdev2->flags))
1da177e4 1819 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
a97b7896 1820 else if (test_bit(Journal, &rdev2->flags))
bac624f3 1821 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
93be75ff 1822 else if (rdev2->raid_disk >= 0)
5fd6c1dc 1823 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1da177e4 1824 else
c4d4c91b 1825 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
1da177e4
LT		 1826 }
1827
1da177e4
LT		 1828 sb->sb_csum = calc_sb_1_csum(sb);
1829}
1830
0cd17fec 1831static unsigned long long
3cb03002 1832super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
0cd17fec
CW		 1833{
1834 struct mdp_superblock_1 *sb;
15f4a5fd 1835 sector_t max_sectors;
58c0fed4 1836 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
0cd17fec 1837 return 0; /* component must fit device */
c6563a8c
N		 1838 if (rdev->data_offset != rdev->new_data_offset)
1839 return 0; /* too confusing */
0f420358 1840 if (rdev->sb_start < rdev->data_offset) {
0cd17fec 1841 /* minor versions 1 and 2; superblock before data */
77304d2a 1842 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
15f4a5fd
AN		 1843 max_sectors -= rdev->data_offset;
1844 if (!num_sectors || num_sectors > max_sectors)
1845 num_sectors = max_sectors;
c3d9714e 1846 } else if (rdev->mddev->bitmap_info.offset) {
0cd17fec
CW		 1847 /* minor version 0 with bitmap we can't move */
1848 return 0;
1849 } else {
1850 /* minor version 0; superblock after data */
0f420358 1851 sector_t sb_start;
77304d2a 1852 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
0f420358 1853 sb_start &= ~(sector_t)(4*2 - 1);
dd8ac336 1854 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
15f4a5fd
AN		 1855 if (!num_sectors || num_sectors > max_sectors)
1856 num_sectors = max_sectors;
0f420358 1857 rdev->sb_start = sb_start;
0cd17fec 1858 }
65a06f06 1859 sb = page_address(rdev->sb_page);
15f4a5fd 1860 sb->data_size = cpu_to_le64(num_sectors);
0f420358 1861 sb->super_offset = rdev->sb_start;
0cd17fec 1862 sb->sb_csum = calc_sb_1_csum(sb);
0f420358 1863 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
0cd17fec
CW		 1864 rdev->sb_page);
1865 md_super_wait(rdev->mddev);
c26a44ed 1866 return num_sectors;
c6563a8c
N		 1867
1868}
1869
1870static int
1871super_1_allow_new_offset(struct md_rdev *rdev,
1872 unsigned long long new_offset)
1873{
1874 /* All necessary checks on new >= old have been done */
1875 struct bitmap *bitmap;
1876 if (new_offset >= rdev->data_offset)
1877 return 1;
1878
1879 /* with 1.0 metadata, there is no metadata to tread on
1880 * so we can always move back */
1881 if (rdev->mddev->minor_version == 0)
1882 return 1;
1883
1884 /* otherwise we must be sure not to step on
1885 * any metadata, so stay:
1886 * 36K beyond start of superblock
1887 * beyond end of badblocks
1888 * beyond write-intent bitmap
1889 */
1890 if (rdev->sb_start + (32+4)*2 > new_offset)
1891 return 0;
1892 bitmap = rdev->mddev->bitmap;
1893 if (bitmap && !rdev->mddev->bitmap_info.file &&
1894 rdev->sb_start + rdev->mddev->bitmap_info.offset +
1ec885cd 1895 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
c6563a8c
N		 1896 return 0;
1897 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
1898 return 0;
1899
1900 return 1;
0cd17fec 1901}
1da177e4 1902
75c96f85 1903static struct super_type super_types[] = {
1da177e4
LT		 1904 [0] = {
1905 .name = "0.90.0",
1906 .owner = THIS_MODULE,
0cd17fec
CW		 1907 .load_super = super_90_load,
1908 .validate_super = super_90_validate,
1909 .sync_super = super_90_sync,
1910 .rdev_size_change = super_90_rdev_size_change,
c6563a8c 1911 .allow_new_offset = super_90_allow_new_offset,
1da177e4
LT		 1912 },
1913 [1] = {
1914 .name = "md-1",
1915 .owner = THIS_MODULE,
0cd17fec
CW		 1916 .load_super = super_1_load,
1917 .validate_super = super_1_validate,
1918 .sync_super = super_1_sync,
1919 .rdev_size_change = super_1_rdev_size_change,
c6563a8c 1920 .allow_new_offset = super_1_allow_new_offset,
1da177e4
LT		 1921 },
1922};
1da177e4 1923
fd01b88c 1924static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
076f968b
JB		 1925{
1926 if (mddev->sync_super) {
1927 mddev->sync_super(mddev, rdev);
1928 return;
1929 }
1930
1931 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
1932
1933 super_types[mddev->major_version].sync_super(mddev, rdev);
1934}
1935
fd01b88c 1936static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
1da177e4 1937{
3cb03002 1938 struct md_rdev *rdev, *rdev2;
1da177e4 1939
4b80991c 1940 rcu_read_lock();
0b020e85
SL		 1941 rdev_for_each_rcu(rdev, mddev1) {
1942 if (test_bit(Faulty, &rdev->flags) ||
1943 test_bit(Journal, &rdev->flags) ||
1944 rdev->raid_disk == -1)
1945 continue;
1946 rdev_for_each_rcu(rdev2, mddev2) {
1947 if (test_bit(Faulty, &rdev2->flags) ||
1948 test_bit(Journal, &rdev2->flags) ||
1949 rdev2->raid_disk == -1)
1950 continue;
7dd5e7c3 1951 if (rdev->bdev->bd_contains ==
4b80991c
N		 1952 rdev2->bdev->bd_contains) {
1953 rcu_read_unlock();
7dd5e7c3 1954 return 1;
4b80991c 1955 }
0b020e85
SL		 1956 }
1957 }
4b80991c 1958 rcu_read_unlock();
1da177e4
LT		 1959 return 0;
1960}
1961
1962static LIST_HEAD(pending_raid_disks);
1963
ac5e7113
AN		 1964/*
1965 * Try to register data integrity profile for an mddev
1966 *
1967 * This is called when an array is started and after a disk has been kicked
1968 * from the array. It only succeeds if all working and active component devices
1969 * are integrity capable with matching profiles.
1970 */
fd01b88c 1971int md_integrity_register(struct mddev *mddev)
ac5e7113 1972{
3cb03002 1973 struct md_rdev *rdev, *reference = NULL;
ac5e7113
AN		 1974
1975 if (list_empty(&mddev->disks))
1976 return 0; /* nothing to do */
629acb6a
JB		 1977 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
1978 return 0; /* shouldn't register, or already is */
dafb20fa 1979 rdev_for_each(rdev, mddev) {
ac5e7113
AN		 1980 /* skip spares and non-functional disks */
1981 if (test_bit(Faulty, &rdev->flags))
1982 continue;
1983 if (rdev->raid_disk < 0)
1984 continue;
ac5e7113
AN		 1985 if (!reference) {
1986 /* Use the first rdev as the reference */
1987 reference = rdev;
1988 continue;
1989 }
1990 /* does this rdev's profile match the reference profile? */
1991 if (blk_integrity_compare(reference->bdev->bd_disk,
1992 rdev->bdev->bd_disk) < 0)
1993 return -EINVAL;
1994 }
89078d57
MP		 1995 if (!reference || !bdev_get_integrity(reference->bdev))
1996 return 0;
ac5e7113
AN		 1997 /*
1998 * All component devices are integrity capable and have matching
1999 * profiles, register the common profile for the md device.
2000 */
25520d55
MP		 2001 blk_integrity_register(mddev->gendisk,
2002 bdev_get_integrity(reference->bdev));
2003
a91a2785
MP		 2004 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
2005 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
2006 printk(KERN_ERR "md: failed to create integrity pool for %s\n",
2007 mdname(mddev));
2008 return -EINVAL;
2009 }
ac5e7113
AN		 2010 return 0;
2011}
2012EXPORT_SYMBOL(md_integrity_register);
2013
1501efad
DW		 2014/*
2015 * Attempt to add an rdev, but only if it is consistent with the current
2016 * integrity profile
2017 */
2018int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
3f9d99c1 2019{
2863b9eb
JB		 2020 struct blk_integrity *bi_rdev;
2021 struct blk_integrity *bi_mddev;
1501efad 2022 char name[BDEVNAME_SIZE];
2863b9eb
JB		 2023
2024 if (!mddev->gendisk)
1501efad 2025 return 0;
2863b9eb
JB		 2026
2027 bi_rdev = bdev_get_integrity(rdev->bdev);
2028 bi_mddev = blk_get_integrity(mddev->gendisk);
3f9d99c1 2029
ac5e7113 2030 if (!bi_mddev) /* nothing to do */
1501efad
DW		 2031 return 0;
2032
2033 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
2034 printk(KERN_NOTICE "%s: incompatible integrity profile for %s\n",
2035 mdname(mddev), bdevname(rdev->bdev, name));
2036 return -ENXIO;
2037 }
2038
2039 return 0;
3f9d99c1 2040}
ac5e7113 2041EXPORT_SYMBOL(md_integrity_add_rdev);
3f9d99c1 2042
f72ffdd6 2043static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
1da177e4 2044{
7dd5e7c3 2045 char b[BDEVNAME_SIZE];
f637b9f9 2046 struct kobject *ko;
5e55e2f5 2047 int err;
1da177e4 2048
11e2ede0
DW		 2049 /* prevent duplicates */
2050 if (find_rdev(mddev, rdev->bdev->bd_dev))
2051 return -EEXIST;
2052
dd8ac336 2053 /* make sure rdev->sectors exceeds mddev->dev_sectors */
f6b6ec5c
SL		 2054 if (!test_bit(Journal, &rdev->flags) &&
2055 rdev->sectors &&
2056 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
a778b73f
N		 2057 if (mddev->pers) {
2058 /* Cannot change size, so fail
2059 * If mddev->level <= 0, then we don't care
2060 * about aligning sizes (e.g. linear)
2061 */
2062 if (mddev->level > 0)
2063 return -ENOSPC;
2064 } else
dd8ac336 2065 mddev->dev_sectors = rdev->sectors;
2bf071bf 2066 }
1da177e4
LT		 2067
2068 /* Verify rdev->desc_nr is unique.
2069 * If it is -1, assign a free number, else
2070 * check number is not in use
2071 */
4878e9eb 2072 rcu_read_lock();
1da177e4
LT		 2073 if (rdev->desc_nr < 0) {
2074 int choice = 0;
4878e9eb
N		 2075 if (mddev->pers)
2076 choice = mddev->raid_disks;
57d051dc 2077 while (md_find_rdev_nr_rcu(mddev, choice))
1da177e4
LT		 2078 choice++;
2079 rdev->desc_nr = choice;
2080 } else {
57d051dc 2081 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) {
4878e9eb 2082 rcu_read_unlock();
1da177e4 2083 return -EBUSY;
4878e9eb 2084 }
1da177e4 2085 }
4878e9eb 2086 rcu_read_unlock();
f6b6ec5c
SL		 2087 if (!test_bit(Journal, &rdev->flags) &&
2088 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
de01dfad
N		 2089 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
2090 mdname(mddev), mddev->max_disks);
2091 return -EBUSY;
2092 }
19133a42 2093 bdevname(rdev->bdev,b);
90a9befb 2094 strreplace(b, '/', '!');
649316b2 2095
1da177e4 2096 rdev->mddev = mddev;
19133a42 2097 printk(KERN_INFO "md: bind<%s>\n", b);
86e6ffdd 2098
b2d6db58 2099 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
5e55e2f5 2100 goto fail;
86e6ffdd 2101
0762b8bd 2102 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
00bcb4ac
N		 2103 if (sysfs_create_link(&rdev->kobj, ko, "block"))
2104 /* failure here is OK */;
2105 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
3c0ee63a 2106
4b80991c 2107 list_add_rcu(&rdev->same_set, &mddev->disks);
e09b457b 2108 bd_link_disk_holder(rdev->bdev, mddev->gendisk);
4044ba58
N		 2109
2110 /* May as well allow recovery to be retried once */
5389042f 2111 mddev->recovery_disabled++;
3f9d99c1 2112
1da177e4 2113 return 0;
5e55e2f5
N		 2114
2115 fail:
2116 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
2117 b, mdname(mddev));
2118 return err;
1da177e4
LT		 2119}
2120
177a99b2 2121static void md_delayed_delete(struct work_struct *ws)
5792a285 2122{
3cb03002 2123 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
5792a285 2124 kobject_del(&rdev->kobj);
177a99b2 2125 kobject_put(&rdev->kobj);
5792a285
N		 2126}
2127
f72ffdd6 2128static void unbind_rdev_from_array(struct md_rdev *rdev)
1da177e4
LT		 2129{
2130 char b[BDEVNAME_SIZE];
403df478 2131
49731baa 2132 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
4b80991c 2133 list_del_rcu(&rdev->same_set);
1da177e4
LT		 2134 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
2135 rdev->mddev = NULL;
86e6ffdd 2136 sysfs_remove_link(&rdev->kobj, "block");
3c0ee63a
N		 2137 sysfs_put(rdev->sysfs_state);
2138 rdev->sysfs_state = NULL;
2230dfe4 2139 rdev->badblocks.count = 0;
5792a285 2140 /* We need to delay this, otherwise we can deadlock when
4b80991c
N		 2141 * writing to 'remove' to "dev/state". We also need
2142 * to delay it due to rcu usage.
5792a285 2143 */
4b80991c 2144 synchronize_rcu();
177a99b2
N		 2145 INIT_WORK(&rdev->del_work, md_delayed_delete);
2146 kobject_get(&rdev->kobj);
e804ac78 2147 queue_work(md_misc_wq, &rdev->del_work);
1da177e4
LT		 2148}
2149
2150/*
2151 * prevent the device from being mounted, repartitioned or
2152 * otherwise reused by a RAID array (or any other kernel
2153 * subsystem), by bd_claiming the device.
2154 */
3cb03002 2155static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
1da177e4
LT		 2156{
2157 int err = 0;
2158 struct block_device *bdev;
2159 char b[BDEVNAME_SIZE];
2160
d4d77629 2161 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
3cb03002 2162 shared ? (struct md_rdev *)lock_rdev : rdev);
1da177e4
LT		 2163 if (IS_ERR(bdev)) {
2164 printk(KERN_ERR "md: could not open %s.\n",
2165 __bdevname(dev, b));
2166 return PTR_ERR(bdev);
2167 }
1da177e4
LT		 2168 rdev->bdev = bdev;
2169 return err;
2170}
2171
3cb03002 2172static void unlock_rdev(struct md_rdev *rdev)
1da177e4
LT		 2173{
2174 struct block_device *bdev = rdev->bdev;
2175 rdev->bdev = NULL;
e525fd89 2176 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1da177e4
LT		 2177}
2178
2179void md_autodetect_dev(dev_t dev);
2180
f72ffdd6 2181static void export_rdev(struct md_rdev *rdev)
1da177e4
LT		 2182{
2183 char b[BDEVNAME_SIZE];
403df478 2184
1da177e4
LT		 2185 printk(KERN_INFO "md: export_rdev(%s)\n",
2186 bdevname(rdev->bdev,b));
545c8795 2187 md_rdev_clear(rdev);
1da177e4 2188#ifndef MODULE
d0fae18f
N		 2189 if (test_bit(AutoDetected, &rdev->flags))
2190 md_autodetect_dev(rdev->bdev->bd_dev);
1da177e4
LT		 2191#endif
2192 unlock_rdev(rdev);
86e6ffdd 2193 kobject_put(&rdev->kobj);
1da177e4
LT		 2194}
2195
fb56dfef 2196void md_kick_rdev_from_array(struct md_rdev *rdev)
1da177e4
LT		 2197{
2198 unbind_rdev_from_array(rdev);
2199 export_rdev(rdev);
2200}
fb56dfef 2201EXPORT_SYMBOL_GPL(md_kick_rdev_from_array);
1da177e4 2202
fd01b88c 2203static void export_array(struct mddev *mddev)
1da177e4 2204{
0638bb0e 2205 struct md_rdev *rdev;
1da177e4 2206
0638bb0e
N		 2207 while (!list_empty(&mddev->disks)) {
2208 rdev = list_first_entry(&mddev->disks, struct md_rdev,
2209 same_set);
fb56dfef 2210 md_kick_rdev_from_array(rdev);
1da177e4 2211 }
1da177e4
LT		 2212 mddev->raid_disks = 0;
2213 mddev->major_version = 0;
2214}
2215
f72ffdd6 2216static void sync_sbs(struct mddev *mddev, int nospares)
1da177e4 2217{
42543769
N		 2218 /* Update each superblock (in-memory image), but
2219 * if we are allowed to, skip spares which already
2220 * have the right event counter, or have one earlier
2221 * (which would mean they aren't being marked as dirty
2222 * with the rest of the array)
2223 */
3cb03002 2224 struct md_rdev *rdev;
dafb20fa 2225 rdev_for_each(rdev, mddev) {
42543769
N		 2226 if (rdev->sb_events == mddev->events ||
2227 (nospares &&
2228 rdev->raid_disk < 0 &&
42543769
N		 2229 rdev->sb_events+1 == mddev->events)) {
2230 /* Don't update this superblock */
2231 rdev->sb_loaded = 2;
2232 } else {
076f968b 2233 sync_super(mddev, rdev);
42543769
N		 2234 rdev->sb_loaded = 1;
2235 }
1da177e4
LT		 2236 }
2237}
2238
2aa82191
GR		 2239static bool does_sb_need_changing(struct mddev *mddev)
2240{
2241 struct md_rdev *rdev;
2242 struct mdp_superblock_1 *sb;
2243 int role;
2244
2245 /* Find a good rdev */
2246 rdev_for_each(rdev, mddev)
2247 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags))
2248 break;
2249
2250 /* No good device found. */
2251 if (!rdev)
2252 return false;
2253
2254 sb = page_address(rdev->sb_page);
2255 /* Check if a device has become faulty or a spare become active */
2256 rdev_for_each(rdev, mddev) {
2257 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
2258 /* Device activated? */
2259 if (role == 0xffff && rdev->raid_disk >=0 &&
2260 !test_bit(Faulty, &rdev->flags))
2261 return true;
2262 /* Device turned faulty? */
2263 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
2264 return true;
2265 }
2266
2267 /* Check if any mddev parameters have changed */
2268 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) ||
2269 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) ||
2aa82191
GR		 2270 (mddev->layout != le64_to_cpu(sb->layout)) ||
2271 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) ||
2272 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize)))
2273 return true;
2274
2275 return false;
2276}
2277
1aee41f6 2278void md_update_sb(struct mddev *mddev, int force_change)
1da177e4 2279{
3cb03002 2280 struct md_rdev *rdev;
06d91a5f 2281 int sync_req;
42543769 2282 int nospares = 0;
2699b672 2283 int any_badblocks_changed = 0;
23b63f9f 2284 int ret = -1;
1da177e4 2285
d87f064f
N		 2286 if (mddev->ro) {
2287 if (force_change)
2288 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2289 return;
2290 }
2aa82191
GR		 2291
2292 if (mddev_is_clustered(mddev)) {
2293 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2294 force_change = 1;
23b63f9f 2295 ret = md_cluster_ops->metadata_update_start(mddev);
2aa82191
GR		 2296 /* Has someone else has updated the sb */
2297 if (!does_sb_need_changing(mddev)) {
23b63f9f
GJ		 2298 if (ret == 0)
2299 md_cluster_ops->metadata_update_cancel(mddev);
2aa82191
GR		 2300 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2301 return;
2302 }
2303 }
1da177e4 2304repeat:
3a3a5ddb 2305 /* First make sure individual recovery_offsets are correct */
dafb20fa 2306 rdev_for_each(rdev, mddev) {
3a3a5ddb
N		 2307 if (rdev->raid_disk >= 0 &&
2308 mddev->delta_disks >= 0 &&
f2076e7d 2309 !test_bit(Journal, &rdev->flags) &&
3a3a5ddb
N		 2310 !test_bit(In_sync, &rdev->flags) &&
2311 mddev->curr_resync_completed > rdev->recovery_offset)
2312 rdev->recovery_offset = mddev->curr_resync_completed;
2313
f72ffdd6 2314 }
bd52b746 2315 if (!mddev->persistent) {
070dc6dd 2316 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3a3a5ddb 2317 clear_bit(MD_CHANGE_DEVS, &mddev->flags);
de393cde 2318 if (!mddev->external) {
d97a41dc 2319 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
dafb20fa 2320 rdev_for_each(rdev, mddev) {
de393cde 2321 if (rdev->badblocks.changed) {
d0962936 2322 rdev->badblocks.changed = 0;
fc974ee2 2323 ack_all_badblocks(&rdev->badblocks);
de393cde
N		 2324 md_error(mddev, rdev);
2325 }
2326 clear_bit(Blocked, &rdev->flags);
2327 clear_bit(BlockedBadBlocks, &rdev->flags);
2328 wake_up(&rdev->blocked_wait);
2329 }
2330 }
3a3a5ddb
N		 2331 wake_up(&mddev->sb_wait);
2332 return;
2333 }
2334
85572d7c 2335 spin_lock(&mddev->lock);
84692195 2336
9ebc6ef1 2337 mddev->utime = ktime_get_real_seconds();
3a3a5ddb 2338
850b2b42
N		 2339 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2340 force_change = 1;
2341 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2342 /* just a clean<-> dirty transition, possibly leave spares alone,
2343 * though if events isn't the right even/odd, we will have to do
2344 * spares after all
2345 */
2346 nospares = 1;
2347 if (force_change)
2348 nospares = 0;
2349 if (mddev->degraded)
84692195
N		 2350 /* If the array is degraded, then skipping spares is both
2351 * dangerous and fairly pointless.
2352 * Dangerous because a device that was removed from the array
2353 * might have a event_count that still looks up-to-date,
2354 * so it can be re-added without a resync.
2355 * Pointless because if there are any spares to skip,
2356 * then a recovery will happen and soon that array won't
2357 * be degraded any more and the spare can go back to sleep then.
2358 */
850b2b42 2359 nospares = 0;
84692195 2360
06d91a5f 2361 sync_req = mddev->in_sync;
42543769
N		 2362
2363 /* If this is just a dirty<->clean transition, and the array is clean
2364 * and 'events' is odd, we can roll back to the previous clean state */
850b2b42 2365 if (nospares
42543769 2366 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
a8707c08
N		 2367 && mddev->can_decrease_events
2368 && mddev->events != 1) {
42543769 2369 mddev->events--;
a8707c08
N		 2370 mddev->can_decrease_events = 0;
2371 } else {
42543769
N		 2372 /* otherwise we have to go forward and ... */
2373 mddev->events ++;
a8707c08 2374 mddev->can_decrease_events = nospares;
42543769 2375 }
1da177e4 2376
403df478
N		 2377 /*
2378 * This 64-bit counter should never wrap.
2379 * Either we are in around ~1 trillion A.C., assuming
2380 * 1 reboot per second, or we have a bug...
2381 */
2382 WARN_ON(mddev->events == 0);
2699b672 2383
dafb20fa 2384 rdev_for_each(rdev, mddev) {
2699b672
N		 2385 if (rdev->badblocks.changed)
2386 any_badblocks_changed++;
de393cde
N		 2387 if (test_bit(Faulty, &rdev->flags))
2388 set_bit(FaultRecorded, &rdev->flags);
2389 }
2699b672 2390
e691063a 2391 sync_sbs(mddev, nospares);
85572d7c 2392 spin_unlock(&mddev->lock);
1da177e4 2393
36a4e1fe
N		 2394 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2395 mdname(mddev), mddev->in_sync);
1da177e4 2396
4ad13663 2397 bitmap_update_sb(mddev->bitmap);
dafb20fa 2398 rdev_for_each(rdev, mddev) {
1da177e4 2399 char b[BDEVNAME_SIZE];
36a4e1fe 2400
42543769
N		 2401 if (rdev->sb_loaded != 1)
2402 continue; /* no noise on spare devices */
1da177e4 2403
f466722c 2404 if (!test_bit(Faulty, &rdev->flags)) {
7bfa19f2 2405 md_super_write(mddev,rdev,
0f420358 2406 rdev->sb_start, rdev->sb_size,
7bfa19f2 2407 rdev->sb_page);
36a4e1fe
N		 2408 pr_debug("md: (write) %s's sb offset: %llu\n",
2409 bdevname(rdev->bdev, b),
2410 (unsigned long long)rdev->sb_start);
42543769 2411 rdev->sb_events = mddev->events;
2699b672
N		 2412 if (rdev->badblocks.size) {
2413 md_super_write(mddev, rdev,
2414 rdev->badblocks.sector,
2415 rdev->badblocks.size << 9,
2416 rdev->bb_page);
2417 rdev->badblocks.size = 0;
2418 }
7bfa19f2 2419
f466722c 2420 } else
36a4e1fe
N		 2421 pr_debug("md: %s (skipping faulty)\n",
2422 bdevname(rdev->bdev, b));
d70ed2e4 2423
7bfa19f2 2424 if (mddev->level == LEVEL_MULTIPATH)
1da177e4
LT		 2425 /* only need to write one superblock... */
2426 break;
2427 }
a9701a30 2428 md_super_wait(mddev);
850b2b42 2429 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
7bfa19f2 2430
85572d7c 2431 spin_lock(&mddev->lock);
850b2b42
N		 2432 if (mddev->in_sync != sync_req ||
2433 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
06d91a5f 2434 /* have to write it out again */
85572d7c 2435 spin_unlock(&mddev->lock);
06d91a5f
N		 2436 goto repeat;
2437 }
850b2b42 2438 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
85572d7c 2439 spin_unlock(&mddev->lock);
3d310eb7 2440 wake_up(&mddev->sb_wait);
acb180b0
N		 2441 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2442 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
06d91a5f 2443
dafb20fa 2444 rdev_for_each(rdev, mddev) {
de393cde
N		 2445 if (test_and_clear_bit(FaultRecorded, &rdev->flags))
2446 clear_bit(Blocked, &rdev->flags);
2447
2448 if (any_badblocks_changed)
fc974ee2 2449 ack_all_badblocks(&rdev->badblocks);
de393cde
N		 2450 clear_bit(BlockedBadBlocks, &rdev->flags);
2451 wake_up(&rdev->blocked_wait);
2452 }
2aa82191 2453
23b63f9f 2454 if (mddev_is_clustered(mddev) && ret == 0)
2aa82191 2455 md_cluster_ops->metadata_update_finish(mddev);
1da177e4 2456}
1aee41f6 2457EXPORT_SYMBOL(md_update_sb);
1da177e4 2458
a6da4ef8
GR		 2459static int add_bound_rdev(struct md_rdev *rdev)
2460{
2461 struct mddev *mddev = rdev->mddev;
2462 int err = 0;
87d4d916 2463 bool add_journal = test_bit(Journal, &rdev->flags);
a6da4ef8 2464
87d4d916 2465 if (!mddev->pers->hot_remove_disk || add_journal) {
a6da4ef8
GR		 2466 /* If there is hot_add_disk but no hot_remove_disk
2467 * then added disks for geometry changes,
2468 * and should be added immediately.
2469 */
2470 super_types[mddev->major_version].
2471 validate_super(mddev, rdev);
87d4d916
SL		 2472 if (add_journal)
2473 mddev_suspend(mddev);
a6da4ef8 2474 err = mddev->pers->hot_add_disk(mddev, rdev);
87d4d916
SL		 2475 if (add_journal)
2476 mddev_resume(mddev);
a6da4ef8
GR		 2477 if (err) {
2478 unbind_rdev_from_array(rdev);
2479 export_rdev(rdev);
2480 return err;
2481 }
2482 }
2483 sysfs_notify_dirent_safe(rdev->sysfs_state);
2484
2485 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2486 if (mddev->degraded)
2487 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2488 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2489 md_new_event(mddev);
2490 md_wakeup_thread(mddev->thread);
2491 return 0;
2492}
1da177e4 2493
7f6ce769 2494/* words written to sysfs files may, or may not, be \n terminated.
bce74dac
N		 2495 * We want to accept with case. For this we use cmd_match.
2496 */
2497static int cmd_match(const char *cmd, const char *str)
2498{
2499 /* See if cmd, written into a sysfs file, matches
2500 * str. They must either be the same, or cmd can
2501 * have a trailing newline
2502 */
2503 while (*cmd && *str && *cmd == *str) {
2504 cmd++;
2505 str++;
2506 }
2507 if (*cmd == '\n')
2508 cmd++;
2509 if (*str || *cmd)
2510 return 0;
2511 return 1;
2512}
2513
86e6ffdd
N		 2514struct rdev_sysfs_entry {
2515 struct attribute attr;
3cb03002
N		 2516 ssize_t (*show)(struct md_rdev *, char *);
2517 ssize_t (*store)(struct md_rdev *, const char *, size_t);
86e6ffdd
N		 2518};
2519
2520static ssize_t
3cb03002 2521state_show(struct md_rdev *rdev, char *page)
86e6ffdd
N		 2522{
2523 char *sep = "";
20a49ff6 2524 size_t len = 0;
758bfc8a 2525 unsigned long flags = ACCESS_ONCE(rdev->flags);
86e6ffdd 2526
758bfc8a 2527 if (test_bit(Faulty, &flags) ||
de393cde 2528 rdev->badblocks.unacked_exist) {
86e6ffdd
N		 2529 len+= sprintf(page+len, "%sfaulty",sep);
2530 sep = ",";
2531 }
758bfc8a 2532 if (test_bit(In_sync, &flags)) {
86e6ffdd
N		 2533 len += sprintf(page+len, "%sin_sync",sep);
2534 sep = ",";
2535 }
ac6096e9
SL		 2536 if (test_bit(Journal, &flags)) {
2537 len += sprintf(page+len, "%sjournal",sep);
2538 sep = ",";
2539 }
758bfc8a 2540 if (test_bit(WriteMostly, &flags)) {
f655675b
N		 2541 len += sprintf(page+len, "%swrite_mostly",sep);
2542 sep = ",";
2543 }
758bfc8a 2544 if (test_bit(Blocked, &flags) ||
52c64152 2545 (rdev->badblocks.unacked_exist
758bfc8a 2546 && !test_bit(Faulty, &flags))) {
6bfe0b49
DW		 2547 len += sprintf(page+len, "%sblocked", sep);
2548 sep = ",";
2549 }
758bfc8a 2550 if (!test_bit(Faulty, &flags) &&
f2076e7d 2551 !test_bit(Journal, &flags) &&
758bfc8a 2552 !test_bit(In_sync, &flags)) {
86e6ffdd
N		 2553 len += sprintf(page+len, "%sspare", sep);
2554 sep = ",";
2555 }
758bfc8a 2556 if (test_bit(WriteErrorSeen, &flags)) {
d7a9d443
N		 2557 len += sprintf(page+len, "%swrite_error", sep);
2558 sep = ",";
2559 }
758bfc8a 2560 if (test_bit(WantReplacement, &flags)) {
2d78f8c4
N		 2561 len += sprintf(page+len, "%swant_replacement", sep);
2562 sep = ",";
2563 }
758bfc8a 2564 if (test_bit(Replacement, &flags)) {
2d78f8c4
N		 2565 len += sprintf(page+len, "%sreplacement", sep);
2566 sep = ",";
2567 }
2568
86e6ffdd
N		 2569 return len+sprintf(page+len, "\n");
2570}
2571
45dc2de1 2572static ssize_t
3cb03002 2573state_store(struct md_rdev *rdev, const char *buf, size_t len)
45dc2de1
N		 2574{
2575 /* can write
de393cde 2576 * faulty - simulates an error
45dc2de1 2577 * remove - disconnects the device
f655675b
N		 2578 * writemostly - sets write_mostly
2579 * -writemostly - clears write_mostly
de393cde
N		 2580 * blocked - sets the Blocked flags
2581 * -blocked - clears the Blocked and possibly simulates an error
6d56e278 2582 * insync - sets Insync providing device isn't active
f466722c
N		 2583 * -insync - clear Insync for a device with a slot assigned,
2584 * so that it gets rebuilt based on bitmap
d7a9d443
N		 2585 * write_error - sets WriteErrorSeen
2586 * -write_error - clears WriteErrorSeen
45dc2de1
N		 2587 */
2588 int err = -EINVAL;
2589 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2590 md_error(rdev->mddev, rdev);
5ef56c8f
N		 2591 if (test_bit(Faulty, &rdev->flags))
2592 err = 0;
2593 else
2594 err = -EBUSY;
45dc2de1
N		 2595 } else if (cmd_match(buf, "remove")) {
2596 if (rdev->raid_disk >= 0)
2597 err = -EBUSY;
2598 else {
fd01b88c 2599 struct mddev *mddev = rdev->mddev;
45dc2de1 2600 err = 0;
a9720903
GJ		 2601 if (mddev_is_clustered(mddev))
2602 err = md_cluster_ops->remove_disk(mddev, rdev);
2603
2604 if (err == 0) {
2605 md_kick_rdev_from_array(rdev);
2606 if (mddev->pers)
2607 md_update_sb(mddev, 1);
2608 md_new_event(mddev);
2609 }
45dc2de1 2610 }
f655675b
N		 2611 } else if (cmd_match(buf, "writemostly")) {
2612 set_bit(WriteMostly, &rdev->flags);
2613 err = 0;
2614 } else if (cmd_match(buf, "-writemostly")) {
2615 clear_bit(WriteMostly, &rdev->flags);
6bfe0b49
DW		 2616 err = 0;
2617 } else if (cmd_match(buf, "blocked")) {
2618 set_bit(Blocked, &rdev->flags);
2619 err = 0;
2620 } else if (cmd_match(buf, "-blocked")) {
de393cde 2621 if (!test_bit(Faulty, &rdev->flags) &&
7da64a0a 2622 rdev->badblocks.unacked_exist) {
de393cde
N		 2623 /* metadata handler doesn't understand badblocks,
2624 * so we need to fail the device
2625 */
2626 md_error(rdev->mddev, rdev);
2627 }
6bfe0b49 2628 clear_bit(Blocked, &rdev->flags);
de393cde 2629 clear_bit(BlockedBadBlocks, &rdev->flags);
6bfe0b49
DW		 2630 wake_up(&rdev->blocked_wait);
2631 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2632 md_wakeup_thread(rdev->mddev->thread);
2633
6d56e278
N		 2634 err = 0;
2635 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2636 set_bit(In_sync, &rdev->flags);
f655675b 2637 err = 0;
f2076e7d
SL		 2638 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 &&
2639 !test_bit(Journal, &rdev->flags)) {
e1960f8c
N		 2640 if (rdev->mddev->pers == NULL) {
2641 clear_bit(In_sync, &rdev->flags);
2642 rdev->saved_raid_disk = rdev->raid_disk;
2643 rdev->raid_disk = -1;
2644 err = 0;
2645 }
d7a9d443
N		 2646 } else if (cmd_match(buf, "write_error")) {
2647 set_bit(WriteErrorSeen, &rdev->flags);
2648 err = 0;
2649 } else if (cmd_match(buf, "-write_error")) {
2650 clear_bit(WriteErrorSeen, &rdev->flags);
2651 err = 0;
2d78f8c4
N		 2652 } else if (cmd_match(buf, "want_replacement")) {
2653 /* Any non-spare device that is not a replacement can
2654 * become want_replacement at any time, but we then need to
2655 * check if recovery is needed.
2656 */
2657 if (rdev->raid_disk >= 0 &&
f2076e7d 2658 !test_bit(Journal, &rdev->flags) &&
2d78f8c4
N		 2659 !test_bit(Replacement, &rdev->flags))
2660 set_bit(WantReplacement, &rdev->flags);
2661 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2662 md_wakeup_thread(rdev->mddev->thread);
2663 err = 0;
2664 } else if (cmd_match(buf, "-want_replacement")) {
2665 /* Clearing 'want_replacement' is always allowed.
2666 * Once replacements starts it is too late though.
2667 */
2668 err = 0;
2669 clear_bit(WantReplacement, &rdev->flags);
2670 } else if (cmd_match(buf, "replacement")) {
2671 /* Can only set a device as a replacement when array has not
2672 * yet been started. Once running, replacement is automatic
2673 * from spares, or by assigning 'slot'.
2674 */
2675 if (rdev->mddev->pers)
2676 err = -EBUSY;
2677 else {
2678 set_bit(Replacement, &rdev->flags);
2679 err = 0;
2680 }
2681 } else if (cmd_match(buf, "-replacement")) {
2682 /* Similarly, can only clear Replacement before start */
2683 if (rdev->mddev->pers)
2684 err = -EBUSY;
2685 else {
2686 clear_bit(Replacement, &rdev->flags);
2687 err = 0;
2688 }
a6da4ef8
GR		 2689 } else if (cmd_match(buf, "re-add")) {
2690 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) {
97f6cd39
GR		 2691 /* clear_bit is performed _after_ all the devices
2692 * have their local Faulty bit cleared. If any writes
2693 * happen in the meantime in the local node, they
2694 * will land in the local bitmap, which will be synced
2695 * by this node eventually
2696 */
2697 if (!mddev_is_clustered(rdev->mddev) ||
2698 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) {
2699 clear_bit(Faulty, &rdev->flags);
2700 err = add_bound_rdev(rdev);
2701 }
a6da4ef8
GR		 2702 } else
2703 err = -EBUSY;
45dc2de1 2704 }
00bcb4ac
N		 2705 if (!err)
2706 sysfs_notify_dirent_safe(rdev->sysfs_state);
45dc2de1
N		 2707 return err ? err : len;
2708}
80ca3a44 2709static struct rdev_sysfs_entry rdev_state =
750f199e 2710__ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store);
86e6ffdd 2711
4dbcdc75 2712static ssize_t
3cb03002 2713errors_show(struct md_rdev *rdev, char *page)
4dbcdc75
N		 2714{
2715 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2716}
2717
2718static ssize_t
3cb03002 2719errors_store(struct md_rdev *rdev, const char *buf, size_t len)
4dbcdc75 2720{
4c9309c0
AD		 2721 unsigned int n;
2722 int rv;
2723
2724 rv = kstrtouint(buf, 10, &n);
2725 if (rv < 0)
2726 return rv;
2727 atomic_set(&rdev->corrected_errors, n);
2728 return len;
4dbcdc75
N		 2729}
2730static struct rdev_sysfs_entry rdev_errors =
80ca3a44 2731__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
4dbcdc75 2732
014236d2 2733static ssize_t
3cb03002 2734slot_show(struct md_rdev *rdev, char *page)
014236d2 2735{
f2076e7d
SL		 2736 if (test_bit(Journal, &rdev->flags))
2737 return sprintf(page, "journal\n");
2738 else if (rdev->raid_disk < 0)
014236d2
N		 2739 return sprintf(page, "none\n");
2740 else
2741 return sprintf(page, "%d\n", rdev->raid_disk);
2742}
2743
2744static ssize_t
3cb03002 2745slot_store(struct md_rdev *rdev, const char *buf, size_t len)
014236d2 2746{
4c9309c0 2747 int slot;
c303da6d 2748 int err;
4c9309c0 2749
f2076e7d
SL		 2750 if (test_bit(Journal, &rdev->flags))
2751 return -EBUSY;
014236d2
N		 2752 if (strncmp(buf, "none", 4)==0)
2753 slot = -1;
4c9309c0
AD		 2754 else {
2755 err = kstrtouint(buf, 10, (unsigned int *)&slot);
2756 if (err < 0)
2757 return err;
2758 }
6c2fce2e 2759 if (rdev->mddev->pers && slot == -1) {
c303da6d
N		 2760 /* Setting 'slot' on an active array requires also
2761 * updating the 'rd%d' link, and communicating
2762 * with the personality with ->hot_*_disk.
2763 * For now we only support removing
2764 * failed/spare devices. This normally happens automatically,
2765 * but not when the metadata is externally managed.
2766 */
c303da6d
N		 2767 if (rdev->raid_disk == -1)
2768 return -EEXIST;
2769 /* personality does all needed checks */
01393f3d 2770 if (rdev->mddev->pers->hot_remove_disk == NULL)
c303da6d 2771 return -EINVAL;
746d3207
N		 2772 clear_bit(Blocked, &rdev->flags);
2773 remove_and_add_spares(rdev->mddev, rdev);
2774 if (rdev->raid_disk >= 0)
2775 return -EBUSY;
c303da6d
N		 2776 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2777 md_wakeup_thread(rdev->mddev->thread);
6c2fce2e 2778 } else if (rdev->mddev->pers) {
6c2fce2e 2779 /* Activating a spare .. or possibly reactivating
6d56e278 2780 * if we ever get bitmaps working here.
6c2fce2e 2781 */
cb01c549 2782 int err;
6c2fce2e
NB		 2783
2784 if (rdev->raid_disk != -1)
2785 return -EBUSY;
2786
c6751b2b
N		 2787 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
2788 return -EBUSY;
2789
6c2fce2e
NB		 2790 if (rdev->mddev->pers->hot_add_disk == NULL)
2791 return -EINVAL;
2792
ba1b41b6
N		 2793 if (slot >= rdev->mddev->raid_disks &&
2794 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
2795 return -ENOSPC;
2796
6c2fce2e
NB		 2797 rdev->raid_disk = slot;
2798 if (test_bit(In_sync, &rdev->flags))
2799 rdev->saved_raid_disk = slot;
2800 else
2801 rdev->saved_raid_disk = -1;
d30519fc 2802 clear_bit(In_sync, &rdev->flags);
8313b8e5 2803 clear_bit(Bitmap_sync, &rdev->flags);
cb01c549
GR		 2804 err = rdev->mddev->pers->
2805 hot_add_disk(rdev->mddev, rdev);
2806 if (err) {
2807 rdev->raid_disk = -1;
2808 return err;
2809 } else
2810 sysfs_notify_dirent_safe(rdev->sysfs_state);
2811 if (sysfs_link_rdev(rdev->mddev, rdev))
2812 /* failure here is OK */;
6c2fce2e 2813 /* don't wakeup anyone, leave that to userspace. */
c303da6d 2814 } else {
ba1b41b6
N		 2815 if (slot >= rdev->mddev->raid_disks &&
2816 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
c303da6d
N		 2817 return -ENOSPC;
2818 rdev->raid_disk = slot;
2819 /* assume it is working */
c5d79adb
N		 2820 clear_bit(Faulty, &rdev->flags);
2821 clear_bit(WriteMostly, &rdev->flags);
c303da6d 2822 set_bit(In_sync, &rdev->flags);
00bcb4ac 2823 sysfs_notify_dirent_safe(rdev->sysfs_state);
c303da6d 2824 }
014236d2
N		 2825 return len;
2826}
2827
014236d2 2828static struct rdev_sysfs_entry rdev_slot =
80ca3a44 2829__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
014236d2 2830
93c8cad0 2831static ssize_t
3cb03002 2832offset_show(struct md_rdev *rdev, char *page)
93c8cad0 2833{
6961ece4 2834 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
93c8cad0
N		 2835}
2836
2837static ssize_t
3cb03002 2838offset_store(struct md_rdev *rdev, const char *buf, size_t len)
93c8cad0 2839{
c6563a8c 2840 unsigned long long offset;
b29bebd6 2841 if (kstrtoull(buf, 10, &offset) < 0)
93c8cad0 2842 return -EINVAL;
8ed0a521 2843 if (rdev->mddev->pers && rdev->raid_disk >= 0)
93c8cad0 2844 return -EBUSY;
dd8ac336 2845 if (rdev->sectors && rdev->mddev->external)
c5d79adb
N		 2846 /* Must set offset before size, so overlap checks
2847 * can be sane */
2848 return -EBUSY;
93c8cad0 2849 rdev->data_offset = offset;
25f7fd47 2850 rdev->new_data_offset = offset;
93c8cad0
N		 2851 return len;
2852}
2853
2854static struct rdev_sysfs_entry rdev_offset =
80ca3a44 2855__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
93c8cad0 2856
c6563a8c
N		 2857static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
2858{
2859 return sprintf(page, "%llu\n",
2860 (unsigned long long)rdev->new_data_offset);
2861}
2862
2863static ssize_t new_offset_store(struct md_rdev *rdev,
2864 const char *buf, size_t len)
2865{
2866 unsigned long long new_offset;
2867 struct mddev *mddev = rdev->mddev;
2868
b29bebd6 2869 if (kstrtoull(buf, 10, &new_offset) < 0)
c6563a8c
N		 2870 return -EINVAL;
2871
f851b60d
N		 2872 if (mddev->sync_thread ||
2873 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
c6563a8c
N		 2874 return -EBUSY;
2875 if (new_offset == rdev->data_offset)
2876 /* reset is always permitted */
2877 ;
2878 else if (new_offset > rdev->data_offset) {
2879 /* must not push array size beyond rdev_sectors */
2880 if (new_offset - rdev->data_offset
2881 + mddev->dev_sectors > rdev->sectors)
2882 return -E2BIG;
2883 }
2884 /* Metadata worries about other space details. */
2885
2886 /* decreasing the offset is inconsistent with a backwards
2887 * reshape.
2888 */
2889 if (new_offset < rdev->data_offset &&
2890 mddev->reshape_backwards)
2891 return -EINVAL;
2892 /* Increasing offset is inconsistent with forwards
2893 * reshape. reshape_direction should be set to
2894 * 'backwards' first.
2895 */
2896 if (new_offset > rdev->data_offset &&
2897 !mddev->reshape_backwards)
2898 return -EINVAL;
2899
2900 if (mddev->pers && mddev->persistent &&
2901 !super_types[mddev->major_version]
2902 .allow_new_offset(rdev, new_offset))
2903 return -E2BIG;
2904 rdev->new_data_offset = new_offset;
2905 if (new_offset > rdev->data_offset)
2906 mddev->reshape_backwards = 1;
2907 else if (new_offset < rdev->data_offset)
2908 mddev->reshape_backwards = 0;
2909
2910 return len;
2911}
2912static struct rdev_sysfs_entry rdev_new_offset =
2913__ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
2914
83303b61 2915static ssize_t
3cb03002 2916rdev_size_show(struct md_rdev *rdev, char *page)
83303b61 2917{
dd8ac336 2918 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
83303b61
N		 2919}
2920
c5d79adb
N		 2921static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2922{
2923 /* check if two start/length pairs overlap */
2924 if (s1+l1 <= s2)
2925 return 0;
2926 if (s2+l2 <= s1)
2927 return 0;
2928 return 1;
2929}
2930
b522adcd
DW		 2931static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2932{
2933 unsigned long long blocks;
2934 sector_t new;
2935
b29bebd6 2936 if (kstrtoull(buf, 10, &blocks) < 0)
b522adcd
DW		 2937 return -EINVAL;
2938
2939 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2940 return -EINVAL; /* sector conversion overflow */
2941
2942 new = blocks * 2;
2943 if (new != blocks * 2)
2944 return -EINVAL; /* unsigned long long to sector_t overflow */
2945
2946 *sectors = new;
2947 return 0;
2948}
2949
83303b61 2950static ssize_t
3cb03002 2951rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
83303b61 2952{
fd01b88c 2953 struct mddev *my_mddev = rdev->mddev;
dd8ac336 2954 sector_t oldsectors = rdev->sectors;
b522adcd 2955 sector_t sectors;
27c529bb 2956
f2076e7d
SL		 2957 if (test_bit(Journal, &rdev->flags))
2958 return -EBUSY;
b522adcd 2959 if (strict_blocks_to_sectors(buf, &sectors) < 0)
d7027458 2960 return -EINVAL;
c6563a8c
N		 2961 if (rdev->data_offset != rdev->new_data_offset)
2962 return -EINVAL; /* too confusing */
0cd17fec 2963 if (my_mddev->pers && rdev->raid_disk >= 0) {
d7027458 2964 if (my_mddev->persistent) {
dd8ac336
AN		 2965 sectors = super_types[my_mddev->major_version].
2966 rdev_size_change(rdev, sectors);
2967 if (!sectors)
0cd17fec 2968 return -EBUSY;
dd8ac336 2969 } else if (!sectors)
77304d2a 2970 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
dd8ac336 2971 rdev->data_offset;
a6468539
N		 2972 if (!my_mddev->pers->resize)
2973 /* Cannot change size for RAID0 or Linear etc */
2974 return -EINVAL;
0cd17fec 2975 }
dd8ac336 2976 if (sectors < my_mddev->dev_sectors)
7d3c6f87 2977 return -EINVAL; /* component must fit device */
0cd17fec 2978
dd8ac336
AN		 2979 rdev->sectors = sectors;
2980 if (sectors > oldsectors && my_mddev->external) {
8b1afc3d
N		 2981 /* Need to check that all other rdevs with the same
2982 * ->bdev do not overlap. 'rcu' is sufficient to walk
2983 * the rdev lists safely.
2984 * This check does not provide a hard guarantee, it
2985 * just helps avoid dangerous mistakes.
c5d79adb 2986 */
fd01b88c 2987 struct mddev *mddev;
c5d79adb 2988 int overlap = 0;
159ec1fc 2989 struct list_head *tmp;
c5d79adb 2990
8b1afc3d 2991 rcu_read_lock();
29ac4aa3 2992 for_each_mddev(mddev, tmp) {
3cb03002 2993 struct md_rdev *rdev2;
c5d79adb 2994
dafb20fa 2995 rdev_for_each(rdev2, mddev)
f21e9ff7
N		 2996 if (rdev->bdev == rdev2->bdev &&
2997 rdev != rdev2 &&
2998 overlaps(rdev->data_offset, rdev->sectors,
2999 rdev2->data_offset,
3000 rdev2->sectors)) {
c5d79adb
N		 3001 overlap = 1;
3002 break;
3003 }
c5d79adb
N		 3004 if (overlap) {
3005 mddev_put(mddev);
3006 break;
3007 }
3008 }
8b1afc3d 3009 rcu_read_unlock();
c5d79adb
N		 3010 if (overlap) {
3011 /* Someone else could have slipped in a size
3012 * change here, but doing so is just silly.
dd8ac336 3013 * We put oldsectors back because we *know* it is
c5d79adb
N		 3014 * safe, and trust userspace not to race with
3015 * itself
3016 */
dd8ac336 3017 rdev->sectors = oldsectors;
c5d79adb
N		 3018 return -EBUSY;
3019 }
3020 }
83303b61
N		 3021 return len;
3022}
3023
3024static struct rdev_sysfs_entry rdev_size =
80ca3a44 3025__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
83303b61 3026
3cb03002 3027static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
06e3c817
DW		 3028{
3029 unsigned long long recovery_start = rdev->recovery_offset;
3030
3031 if (test_bit(In_sync, &rdev->flags) ||
3032 recovery_start == MaxSector)
3033 return sprintf(page, "none\n");
3034
3035 return sprintf(page, "%llu\n", recovery_start);
3036}
3037
3cb03002 3038static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
06e3c817
DW		 3039{
3040 unsigned long long recovery_start;
3041
3042 if (cmd_match(buf, "none"))
3043 recovery_start = MaxSector;
b29bebd6 3044 else if (kstrtoull(buf, 10, &recovery_start))
06e3c817
DW		 3045 return -EINVAL;
3046
3047 if (rdev->mddev->pers &&
3048 rdev->raid_disk >= 0)
3049 return -EBUSY;
3050
3051 rdev->recovery_offset = recovery_start;
3052 if (recovery_start == MaxSector)
3053 set_bit(In_sync, &rdev->flags);
3054 else
3055 clear_bit(In_sync, &rdev->flags);
3056 return len;
3057}
3058
3059static struct rdev_sysfs_entry rdev_recovery_start =
3060__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
3061
fc974ee2
VV		 3062/* sysfs access to bad-blocks list.
3063 * We present two files.
3064 * 'bad-blocks' lists sector numbers and lengths of ranges that
3065 * are recorded as bad. The list is truncated to fit within
3066 * the one-page limit of sysfs.
3067 * Writing "sector length" to this file adds an acknowledged
3068 * bad block list.
3069 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3070 * been acknowledged. Writing to this file adds bad blocks
3071 * without acknowledging them. This is largely for testing.
3072 */
3cb03002 3073static ssize_t bb_show(struct md_rdev *rdev, char *page)
16c791a5
N		 3074{
3075 return badblocks_show(&rdev->badblocks, page, 0);
3076}
3cb03002 3077static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
16c791a5 3078{
de393cde
N		 3079 int rv = badblocks_store(&rdev->badblocks, page, len, 0);
3080 /* Maybe that ack was all we needed */
3081 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
3082 wake_up(&rdev->blocked_wait);
3083 return rv;
16c791a5
N		 3084}
3085static struct rdev_sysfs_entry rdev_bad_blocks =
3086__ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
3087
3cb03002 3088static ssize_t ubb_show(struct md_rdev *rdev, char *page)
16c791a5
N		 3089{
3090 return badblocks_show(&rdev->badblocks, page, 1);
3091}
3cb03002 3092static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
16c791a5
N		 3093{
3094 return badblocks_store(&rdev->badblocks, page, len, 1);
3095}
3096static struct rdev_sysfs_entry rdev_unack_bad_blocks =
3097__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
3098
86e6ffdd
N		 3099static struct attribute *rdev_default_attrs[] = {
3100 &rdev_state.attr,
4dbcdc75 3101 &rdev_errors.attr,
014236d2 3102 &rdev_slot.attr,
93c8cad0 3103 &rdev_offset.attr,
c6563a8c 3104 &rdev_new_offset.attr,
83303b61 3105 &rdev_size.attr,
06e3c817 3106 &rdev_recovery_start.attr,
16c791a5
N		 3107 &rdev_bad_blocks.attr,
3108 &rdev_unack_bad_blocks.attr,
86e6ffdd
N		 3109 NULL,
3110};
3111static ssize_t
3112rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3113{
3114 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3cb03002 3115 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
86e6ffdd
N		 3116
3117 if (!entry->show)
3118 return -EIO;
758bfc8a
N		 3119 if (!rdev->mddev)
3120 return -EBUSY;
3121 return entry->show(rdev, page);
86e6ffdd
N		 3122}
3123
3124static ssize_t
3125rdev_attr_store(struct kobject *kobj, struct attribute *attr,
3126 const char *page, size_t length)
3127{
3128 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
3cb03002 3129 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
27c529bb 3130 ssize_t rv;
fd01b88c 3131 struct mddev *mddev = rdev->mddev;
86e6ffdd
N		 3132
3133 if (!entry->store)
3134 return -EIO;
67463acb
N		 3135 if (!capable(CAP_SYS_ADMIN))
3136 return -EACCES;
27c529bb 3137 rv = mddev ? mddev_lock(mddev): -EBUSY;
ca388059 3138 if (!rv) {
27c529bb
N		 3139 if (rdev->mddev == NULL)
3140 rv = -EBUSY;
3141 else
3142 rv = entry->store(rdev, page, length);
6a51830e 3143 mddev_unlock(mddev);
ca388059
N		 3144 }
3145 return rv;
86e6ffdd
N		 3146}
3147
3148static void rdev_free(struct kobject *ko)
3149{
3cb03002 3150 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
86e6ffdd
N		 3151 kfree(rdev);
3152}
52cf25d0 3153static const struct sysfs_ops rdev_sysfs_ops = {
86e6ffdd
N		 3154 .show = rdev_attr_show,
3155 .store = rdev_attr_store,
3156};
3157static struct kobj_type rdev_ktype = {
3158 .release = rdev_free,
3159 .sysfs_ops = &rdev_sysfs_ops,
3160 .default_attrs = rdev_default_attrs,
3161};
3162
3cb03002 3163int md_rdev_init(struct md_rdev *rdev)
e8bb9a83
N		 3164{
3165 rdev->desc_nr = -1;
3166 rdev->saved_raid_disk = -1;
3167 rdev->raid_disk = -1;
3168 rdev->flags = 0;
3169 rdev->data_offset = 0;
c6563a8c 3170 rdev->new_data_offset = 0;
e8bb9a83
N		 3171 rdev->sb_events = 0;
3172 rdev->last_read_error.tv_sec = 0;
3173 rdev->last_read_error.tv_nsec = 0;
2699b672
N		 3174 rdev->sb_loaded = 0;
3175 rdev->bb_page = NULL;
e8bb9a83
N		 3176 atomic_set(&rdev->nr_pending, 0);
3177 atomic_set(&rdev->read_errors, 0);
3178 atomic_set(&rdev->corrected_errors, 0);
3179
3180 INIT_LIST_HEAD(&rdev->same_set);
3181 init_waitqueue_head(&rdev->blocked_wait);
2230dfe4
N		 3182
3183 /* Add space to store bad block list.
3184 * This reserves the space even on arrays where it cannot
3185 * be used - I wonder if that matters
3186 */
fc974ee2 3187 return badblocks_init(&rdev->badblocks, 0);
e8bb9a83
N		 3188}
3189EXPORT_SYMBOL_GPL(md_rdev_init);
1da177e4
LT		 3190/*
3191 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3192 *
3193 * mark the device faulty if:
3194 *
3195 * - the device is nonexistent (zero size)
3196 * - the device has no valid superblock
3197 *
3198 * a faulty rdev _never_ has rdev->sb set.
3199 */
3cb03002 3200static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
1da177e4
LT		 3201{
3202 char b[BDEVNAME_SIZE];
3203 int err;
3cb03002 3204 struct md_rdev *rdev;
1da177e4
LT		 3205 sector_t size;
3206
9ffae0cf 3207 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1da177e4
LT		 3208 if (!rdev) {
3209 printk(KERN_ERR "md: could not alloc mem for new device!\n");
3210 return ERR_PTR(-ENOMEM);
3211 }
1da177e4 3212
2230dfe4
N		 3213 err = md_rdev_init(rdev);
3214 if (err)
3215 goto abort_free;
3216 err = alloc_disk_sb(rdev);
3217 if (err)
1da177e4
LT		 3218 goto abort_free;
3219
c5d79adb 3220 err = lock_rdev(rdev, newdev, super_format == -2);
1da177e4
LT		 3221 if (err)
3222 goto abort_free;
3223
f9cb074b 3224 kobject_init(&rdev->kobj, &rdev_ktype);
86e6ffdd 3225
77304d2a 3226 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
1da177e4 3227 if (!size) {
f72ffdd6 3228 printk(KERN_WARNING
1da177e4
LT		 3229 "md: %s has zero or unknown size, marking faulty!\n",
3230 bdevname(rdev->bdev,b));
3231 err = -EINVAL;
3232 goto abort_free;
3233 }
3234
3235 if (super_format >= 0) {
3236 err = super_types[super_format].
3237 load_super(rdev, NULL, super_minor);
3238 if (err == -EINVAL) {
df968c4e
N		 3239 printk(KERN_WARNING
3240 "md: %s does not have a valid v%d.%d "
3241 "superblock, not importing!\n",
3242 bdevname(rdev->bdev,b),
3243 super_format, super_minor);
1da177e4
LT		 3244 goto abort_free;
3245 }
3246 if (err < 0) {
f72ffdd6 3247 printk(KERN_WARNING
1da177e4
LT		 3248 "md: could not read %s's sb, not importing!\n",
3249 bdevname(rdev->bdev,b));
3250 goto abort_free;
3251 }
3252 }
6bfe0b49 3253
1da177e4
LT		 3254 return rdev;
3255
3256abort_free:
2699b672
N		 3257 if (rdev->bdev)
3258 unlock_rdev(rdev);
545c8795 3259 md_rdev_clear(rdev);
1da177e4
LT		 3260 kfree(rdev);
3261 return ERR_PTR(err);
3262}
3263
3264/*
3265 * Check a full RAID array for plausibility
3266 */
3267
f72ffdd6 3268static void analyze_sbs(struct mddev *mddev)
1da177e4
LT		 3269{
3270 int i;
3cb03002 3271 struct md_rdev *rdev, *freshest, *tmp;
1da177e4
LT		 3272 char b[BDEVNAME_SIZE];
3273
3274 freshest = NULL;
dafb20fa 3275 rdev_for_each_safe(rdev, tmp, mddev)
1da177e4
LT		 3276 switch (super_types[mddev->major_version].
3277 load_super(rdev, freshest, mddev->minor_version)) {
3278 case 1:
3279 freshest = rdev;
3280 break;
3281 case 0:
3282 break;
3283 default:
3284 printk( KERN_ERR \
3285 "md: fatal superblock inconsistency in %s"
f72ffdd6 3286 " -- removing from array\n",
1da177e4 3287 bdevname(rdev->bdev,b));
fb56dfef 3288 md_kick_rdev_from_array(rdev);
1da177e4
LT		 3289 }
3290
1da177e4
LT		 3291 super_types[mddev->major_version].
3292 validate_super(mddev, freshest);
3293
3294 i = 0;
dafb20fa 3295 rdev_for_each_safe(rdev, tmp, mddev) {
233fca36
N		 3296 if (mddev->max_disks &&
3297 (rdev->desc_nr >= mddev->max_disks ||
3298 i > mddev->max_disks)) {
de01dfad
N		 3299 printk(KERN_WARNING
3300 "md: %s: %s: only %d devices permitted\n",
3301 mdname(mddev), bdevname(rdev->bdev, b),
3302 mddev->max_disks);
fb56dfef 3303 md_kick_rdev_from_array(rdev);
de01dfad
N		 3304 continue;
3305 }
1aee41f6 3306 if (rdev != freshest) {
1da177e4
LT		 3307 if (super_types[mddev->major_version].
3308 validate_super(mddev, rdev)) {
3309 printk(KERN_WARNING "md: kicking non-fresh %s"
3310 " from array!\n",
3311 bdevname(rdev->bdev,b));
fb56dfef 3312 md_kick_rdev_from_array(rdev);
1da177e4
LT		 3313 continue;
3314 }
1aee41f6 3315 }
1da177e4
LT		 3316 if (mddev->level == LEVEL_MULTIPATH) {
3317 rdev->desc_nr = i++;
3318 rdev->raid_disk = rdev->desc_nr;
b2d444d7 3319 set_bit(In_sync, &rdev->flags);
f2076e7d
SL		 3320 } else if (rdev->raid_disk >=
3321 (mddev->raid_disks - min(0, mddev->delta_disks)) &&
3322 !test_bit(Journal, &rdev->flags)) {
a778b73f
N		 3323 rdev->raid_disk = -1;
3324 clear_bit(In_sync, &rdev->flags);
1da177e4
LT		 3325 }
3326 }
1da177e4
LT		 3327}
3328
72e02075
N		 3329/* Read a fixed-point number.
3330 * Numbers in sysfs attributes should be in "standard" units where
3331 * possible, so time should be in seconds.
f72ffdd6 3332 * However we internally use a a much smaller unit such as
72e02075
N		 3333 * milliseconds or jiffies.
3334 * This function takes a decimal number with a possible fractional
3335 * component, and produces an integer which is the result of
3336 * multiplying that number by 10^'scale'.
3337 * all without any floating-point arithmetic.
3338 */
3339int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
3340{
3341 unsigned long result = 0;
3342 long decimals = -1;
3343 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
3344 if (*cp == '.')
3345 decimals = 0;
3346 else if (decimals < scale) {
3347 unsigned int value;
3348 value = *cp - '0';
3349 result = result * 10 + value;
3350 if (decimals >= 0)
3351 decimals++;
3352 }
3353 cp++;
3354 }
3355 if (*cp == '\n')
3356 cp++;
3357 if (*cp)
3358 return -EINVAL;
3359 if (decimals < 0)
3360 decimals = 0;
3361 while (decimals < scale) {
3362 result *= 10;
3363 decimals ++;
3364 }
3365 *res = result;
3366 return 0;
3367}
3368
16f17b39 3369static ssize_t
fd01b88c 3370safe_delay_show(struct mddev *mddev, char *page)
16f17b39
N		 3371{
3372 int msec = (mddev->safemode_delay*1000)/HZ;
3373 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
3374}
3375static ssize_t
fd01b88c 3376safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
16f17b39 3377{
16f17b39 3378 unsigned long msec;
97ce0a7f 3379
28c1b9fd
GR		 3380 if (mddev_is_clustered(mddev)) {
3381 pr_info("md: Safemode is disabled for clustered mode\n");
3382 return -EINVAL;
3383 }
3384
72e02075 3385 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
16f17b39 3386 return -EINVAL;
16f17b39
N		 3387 if (msec == 0)
3388 mddev->safemode_delay = 0;
3389 else {
19052c0e 3390 unsigned long old_delay = mddev->safemode_delay;
1b30e66f
N		 3391 unsigned long new_delay = (msec*HZ)/1000;
3392
3393 if (new_delay == 0)
3394 new_delay = 1;
3395 mddev->safemode_delay = new_delay;
3396 if (new_delay < old_delay || old_delay == 0)
3397 mod_timer(&mddev->safemode_timer, jiffies+1);
16f17b39
N		 3398 }
3399 return len;
3400}
3401static struct md_sysfs_entry md_safe_delay =
80ca3a44 3402__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
16f17b39 3403
eae1701f 3404static ssize_t
fd01b88c 3405level_show(struct mddev *mddev, char *page)
eae1701f 3406{
36d091f4
N		 3407 struct md_personality *p;
3408 int ret;
3409 spin_lock(&mddev->lock);
3410 p = mddev->pers;
d9d166c2 3411 if (p)
36d091f4 3412 ret = sprintf(page, "%s\n", p->name);
d9d166c2 3413 else if (mddev->clevel[0])
36d091f4 3414 ret = sprintf(page, "%s\n", mddev->clevel);
d9d166c2 3415 else if (mddev->level != LEVEL_NONE)
36d091f4 3416 ret = sprintf(page, "%d\n", mddev->level);
d9d166c2 3417 else
36d091f4
N		 3418 ret = 0;
3419 spin_unlock(&mddev->lock);
3420 return ret;
eae1701f
N		 3421}
3422
d9d166c2 3423static ssize_t
fd01b88c 3424level_store(struct mddev *mddev, const char *buf, size_t len)
d9d166c2 3425{
f2859af6 3426 char clevel[16];
6791875e
N		 3427 ssize_t rv;
3428 size_t slen = len;
db721d32 3429 struct md_personality *pers, *oldpers;
f2859af6 3430 long level;
db721d32 3431 void *priv, *oldpriv;
3cb03002 3432 struct md_rdev *rdev;
245f46c2 3433
6791875e
N		 3434 if (slen == 0 || slen >= sizeof(clevel))
3435 return -EINVAL;
3436
3437 rv = mddev_lock(mddev);
3438 if (rv)
3439 return rv;
3440
245f46c2 3441 if (mddev->pers == NULL) {
6791875e
N		 3442 strncpy(mddev->clevel, buf, slen);
3443 if (mddev->clevel[slen-1] == '\n')
3444 slen--;
3445 mddev->clevel[slen] = 0;
245f46c2 3446 mddev->level = LEVEL_NONE;
6791875e
N		 3447 rv = len;
3448 goto out_unlock;
245f46c2 3449 }
6791875e 3450 rv = -EROFS;
bd8839e0 3451 if (mddev->ro)
6791875e 3452 goto out_unlock;
245f46c2
N		 3453
3454 /* request to change the personality. Need to ensure:
3455 * - array is not engaged in resync/recovery/reshape
3456 * - old personality can be suspended
3457 * - new personality will access other array.
3458 */
3459
6791875e 3460 rv = -EBUSY;
bb4f1e9d 3461 if (mddev->sync_thread ||
f851b60d 3462 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
bb4f1e9d
N		 3463 mddev->reshape_position != MaxSector ||
3464 mddev->sysfs_active)
6791875e 3465 goto out_unlock;
245f46c2 3466
6791875e 3467 rv = -EINVAL;
245f46c2
N		 3468 if (!mddev->pers->quiesce) {
3469 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
3470 mdname(mddev), mddev->pers->name);
6791875e 3471 goto out_unlock;
245f46c2
N		 3472 }
3473
3474 /* Now find the new personality */
6791875e
N		 3475 strncpy(clevel, buf, slen);
3476 if (clevel[slen-1] == '\n')
3477 slen--;
3478 clevel[slen] = 0;
b29bebd6 3479 if (kstrtol(clevel, 10, &level))
f2859af6 3480 level = LEVEL_NONE;
245f46c2 3481
f2859af6
DW		 3482 if (request_module("md-%s", clevel) != 0)
3483 request_module("md-level-%s", clevel);
245f46c2 3484 spin_lock(&pers_lock);
f2859af6 3485 pers = find_pers(level, clevel);
245f46c2
N		 3486 if (!pers || !try_module_get(pers->owner)) {
3487 spin_unlock(&pers_lock);
f2859af6 3488 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
6791875e
N		 3489 rv = -EINVAL;
3490 goto out_unlock;
245f46c2
N		 3491 }
3492 spin_unlock(&pers_lock);
3493
3494 if (pers == mddev->pers) {
3495 /* Nothing to do! */
3496 module_put(pers->owner);
6791875e
N		 3497 rv = len;
3498 goto out_unlock;
245f46c2
N		 3499 }
3500 if (!pers->takeover) {
3501 module_put(pers->owner);
3502 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
f2859af6 3503 mdname(mddev), clevel);
6791875e
N		 3504 rv = -EINVAL;
3505 goto out_unlock;
245f46c2
N		 3506 }
3507
dafb20fa 3508 rdev_for_each(rdev, mddev)
e93f68a1
N		 3509 rdev->new_raid_disk = rdev->raid_disk;
3510
245f46c2
N		 3511 /* ->takeover must set new_* and/or delta_disks
3512 * if it succeeds, and may set them when it fails.
3513 */
3514 priv = pers->takeover(mddev);
3515 if (IS_ERR(priv)) {
3516 mddev->new_level = mddev->level;
3517 mddev->new_layout = mddev->layout;
664e7c41 3518 mddev->new_chunk_sectors = mddev->chunk_sectors;
245f46c2
N		 3519 mddev->raid_disks -= mddev->delta_disks;
3520 mddev->delta_disks = 0;
2c810cdd 3521 mddev->reshape_backwards = 0;
245f46c2
N		 3522 module_put(pers->owner);
3523 printk(KERN_WARNING "md: %s: %s would not accept array\n",
f2859af6 3524 mdname(mddev), clevel);
6791875e
N		 3525 rv = PTR_ERR(priv);
3526 goto out_unlock;
245f46c2
N		 3527 }
3528
3529 /* Looks like we have a winner */
3530 mddev_suspend(mddev);
5aa61f42 3531 mddev_detach(mddev);
36d091f4
N		 3532
3533 spin_lock(&mddev->lock);
db721d32
N		 3534 oldpers = mddev->pers;
3535 oldpriv = mddev->private;
3536 mddev->pers = pers;
3537 mddev->private = priv;
3538 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3539 mddev->level = mddev->new_level;
3540 mddev->layout = mddev->new_layout;
3541 mddev->chunk_sectors = mddev->new_chunk_sectors;
3542 mddev->delta_disks = 0;
3543 mddev->reshape_backwards = 0;
3544 mddev->degraded = 0;
36d091f4 3545 spin_unlock(&mddev->lock);
db721d32
N		 3546
3547 if (oldpers->sync_request == NULL &&
3548 mddev->external) {
3549 /* We are converting from a no-redundancy array
3550 * to a redundancy array and metadata is managed
3551 * externally so we need to be sure that writes
3552 * won't block due to a need to transition
3553 * clean->dirty
3554 * until external management is started.
3555 */
3556 mddev->in_sync = 0;
3557 mddev->safemode_delay = 0;
3558 mddev->safemode = 0;
3559 }
f72ffdd6 3560
db721d32
N		 3561 oldpers->free(mddev, oldpriv);
3562
3563 if (oldpers->sync_request == NULL &&
a64c876f
N		 3564 pers->sync_request != NULL) {
3565 /* need to add the md_redundancy_group */
3566 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3567 printk(KERN_WARNING
3568 "md: cannot register extra attributes for %s\n",
3569 mdname(mddev));
388975cc 3570 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
f72ffdd6 3571 }
db721d32 3572 if (oldpers->sync_request != NULL &&
a64c876f
N		 3573 pers->sync_request == NULL) {
3574 /* need to remove the md_redundancy_group */
3575 if (mddev->to_remove == NULL)
3576 mddev->to_remove = &md_redundancy_group;
3577 }
3578
dafb20fa 3579 rdev_for_each(rdev, mddev) {
e93f68a1
N		 3580 if (rdev->raid_disk < 0)
3581 continue;
bf2cb0da 3582 if (rdev->new_raid_disk >= mddev->raid_disks)
e93f68a1
N		 3583 rdev->new_raid_disk = -1;
3584 if (rdev->new_raid_disk == rdev->raid_disk)
3585 continue;
36fad858 3586 sysfs_unlink_rdev(mddev, rdev);
e93f68a1 3587 }
dafb20fa 3588 rdev_for_each(rdev, mddev) {
e93f68a1
N		 3589 if (rdev->raid_disk < 0)
3590 continue;
3591 if (rdev->new_raid_disk == rdev->raid_disk)
3592 continue;
3593 rdev->raid_disk = rdev->new_raid_disk;
3594 if (rdev->raid_disk < 0)
3a981b03 3595 clear_bit(In_sync, &rdev->flags);
e93f68a1 3596 else {
36fad858
NK		 3597 if (sysfs_link_rdev(mddev, rdev))
3598 printk(KERN_WARNING "md: cannot register rd%d"
3599 " for %s after level change\n",
3600 rdev->raid_disk, mdname(mddev));
3a981b03 3601 }
e93f68a1
N		 3602 }
3603
db721d32 3604 if (pers->sync_request == NULL) {
9af204cf
TM		 3605 /* this is now an array without redundancy, so
3606 * it must always be in_sync
3607 */
3608 mddev->in_sync = 1;
3609 del_timer_sync(&mddev->safemode_timer);
3610 }
02e5f5c0 3611 blk_set_stacking_limits(&mddev->queue->limits);
245f46c2 3612 pers->run(mddev);
245f46c2 3613 set_bit(MD_CHANGE_DEVS, &mddev->flags);
47525e59 3614 mddev_resume(mddev);
830778a1
N		 3615 if (!mddev->thread)
3616 md_update_sb(mddev, 1);
5cac7861 3617 sysfs_notify(&mddev->kobj, NULL, "level");
bb7f8d22 3618 md_new_event(mddev);
6791875e
N		 3619 rv = len;
3620out_unlock:
3621 mddev_unlock(mddev);
d9d166c2
N		 3622 return rv;
3623}
3624
3625static struct md_sysfs_entry md_level =
80ca3a44 3626__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
eae1701f 3627
d4dbd025 3628static ssize_t
fd01b88c 3629layout_show(struct mddev *mddev, char *page)
d4dbd025
N		 3630{
3631 /* just a number, not meaningful for all levels */
08a02ecd
N		 3632 if (mddev->reshape_position != MaxSector &&
3633 mddev->layout != mddev->new_layout)
3634 return sprintf(page, "%d (%d)\n",
3635 mddev->new_layout, mddev->layout);
d4dbd025
N		 3636 return sprintf(page, "%d\n", mddev->layout);
3637}
3638
3639static ssize_t
fd01b88c 3640layout_store(struct mddev *mddev, const char *buf, size_t len)
d4dbd025 3641{
4c9309c0 3642 unsigned int n;
6791875e 3643 int err;
d4dbd025 3644
4c9309c0
AD		 3645 err = kstrtouint(buf, 10, &n);
3646 if (err < 0)
3647 return err;
6791875e
N		 3648 err = mddev_lock(mddev);
3649 if (err)
3650 return err;
d4dbd025 3651
b3546035 3652 if (mddev->pers) {
50ac168a 3653 if (mddev->pers->check_reshape == NULL)
6791875e
N		 3654 err = -EBUSY;
3655 else if (mddev->ro)
3656 err = -EROFS;
3657 else {
3658 mddev->new_layout = n;
3659 err = mddev->pers->check_reshape(mddev);
3660 if (err)
3661 mddev->new_layout = mddev->layout;
597a711b 3662 }
b3546035 3663 } else {
08a02ecd 3664 mddev->new_layout = n;
b3546035
N		 3665 if (mddev->reshape_position == MaxSector)
3666 mddev->layout = n;
3667 }
6791875e
N		 3668 mddev_unlock(mddev);
3669 return err ?: len;
d4dbd025
N		 3670}
3671static struct md_sysfs_entry md_layout =
80ca3a44 3672__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
d4dbd025 3673
eae1701f 3674static ssize_t
fd01b88c 3675raid_disks_show(struct mddev *mddev, char *page)
eae1701f 3676{
bb636547
N		 3677 if (mddev->raid_disks == 0)
3678 return 0;
08a02ecd
N		 3679 if (mddev->reshape_position != MaxSector &&
3680 mddev->delta_disks != 0)
3681 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3682 mddev->raid_disks - mddev->delta_disks);
eae1701f
N		 3683 return sprintf(page, "%d\n", mddev->raid_disks);
3684}
3685
fd01b88c 3686static int update_raid_disks(struct mddev *mddev, int raid_disks);
da943b99
N		 3687
3688static ssize_t
fd01b88c 3689raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
da943b99 3690{
4c9309c0 3691 unsigned int n;
6791875e 3692 int err;
da943b99 3693
4c9309c0
AD		 3694 err = kstrtouint(buf, 10, &n);
3695 if (err < 0)
3696 return err;
da943b99 3697
6791875e
N		 3698 err = mddev_lock(mddev);
3699 if (err)
3700 return err;
da943b99 3701 if (mddev->pers)
6791875e 3702 err = update_raid_disks(mddev, n);
08a02ecd 3703 else if (mddev->reshape_position != MaxSector) {
c6563a8c 3704 struct md_rdev *rdev;
08a02ecd 3705 int olddisks = mddev->raid_disks - mddev->delta_disks;
c6563a8c 3706
6791875e 3707 err = -EINVAL;
c6563a8c
N		 3708 rdev_for_each(rdev, mddev) {
3709 if (olddisks < n &&
3710 rdev->data_offset < rdev->new_data_offset)
6791875e 3711 goto out_unlock;
c6563a8c
N		 3712 if (olddisks > n &&
3713 rdev->data_offset > rdev->new_data_offset)
6791875e 3714 goto out_unlock;
c6563a8c 3715 }
6791875e 3716 err = 0;
08a02ecd
N		 3717 mddev->delta_disks = n - olddisks;
3718 mddev->raid_disks = n;
2c810cdd 3719 mddev->reshape_backwards = (mddev->delta_disks < 0);
08a02ecd 3720 } else
da943b99 3721 mddev->raid_disks = n;
6791875e
N		 3722out_unlock:
3723 mddev_unlock(mddev);
3724 return err ? err : len;
da943b99
N		 3725}
3726static struct md_sysfs_entry md_raid_disks =
80ca3a44 3727__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
eae1701f 3728
3b34380a 3729static ssize_t
fd01b88c 3730chunk_size_show(struct mddev *mddev, char *page)
3b34380a 3731{
08a02ecd 3732 if (mddev->reshape_position != MaxSector &&
664e7c41
AN		 3733 mddev->chunk_sectors != mddev->new_chunk_sectors)
3734 return sprintf(page, "%d (%d)\n",
3735 mddev->new_chunk_sectors << 9,
9d8f0363
AN		 3736 mddev->chunk_sectors << 9);
3737 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
3b34380a
N		 3738}
3739
3740static ssize_t
fd01b88c 3741chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
3b34380a 3742{
4c9309c0 3743 unsigned long n;
6791875e 3744 int err;
3b34380a 3745
4c9309c0
AD		 3746 err = kstrtoul(buf, 10, &n);
3747 if (err < 0)
3748 return err;
3b34380a 3749
6791875e
N		 3750 err = mddev_lock(mddev);
3751 if (err)
3752 return err;
b3546035 3753 if (mddev->pers) {
50ac168a 3754 if (mddev->pers->check_reshape == NULL)
6791875e
N		 3755 err = -EBUSY;
3756 else if (mddev->ro)
3757 err = -EROFS;
3758 else {
3759 mddev->new_chunk_sectors = n >> 9;
3760 err = mddev->pers->check_reshape(mddev);
3761 if (err)
3762 mddev->new_chunk_sectors = mddev->chunk_sectors;
597a711b 3763 }
b3546035 3764 } else {
664e7c41 3765 mddev->new_chunk_sectors = n >> 9;
b3546035 3766 if (mddev->reshape_position == MaxSector)
9d8f0363 3767 mddev->chunk_sectors = n >> 9;
b3546035 3768 }
6791875e
N		 3769 mddev_unlock(mddev);
3770 return err ?: len;
3b34380a
N		 3771}
3772static struct md_sysfs_entry md_chunk_size =
80ca3a44 3773__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
3b34380a 3774
a94213b1 3775static ssize_t
fd01b88c 3776resync_start_show(struct mddev *mddev, char *page)
a94213b1 3777{
d1a7c503
N		 3778 if (mddev->recovery_cp == MaxSector)
3779 return sprintf(page, "none\n");
a94213b1
N		 3780 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3781}
3782
3783static ssize_t
fd01b88c 3784resync_start_store(struct mddev *mddev, const char *buf, size_t len)
a94213b1 3785{
4c9309c0 3786 unsigned long long n;
6791875e 3787 int err;
4c9309c0
AD		 3788
3789 if (cmd_match(buf, "none"))
3790 n = MaxSector;
3791 else {
3792 err = kstrtoull(buf, 10, &n);
3793 if (err < 0)
3794 return err;
3795 if (n != (sector_t)n)
3796 return -EINVAL;
3797 }
a94213b1 3798
6791875e
N		 3799 err = mddev_lock(mddev);
3800 if (err)
3801 return err;
b098636c 3802 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6791875e 3803 err = -EBUSY;
a94213b1 3804
6791875e
N		 3805 if (!err) {
3806 mddev->recovery_cp = n;
3807 if (mddev->pers)
3808 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3809 }
3810 mddev_unlock(mddev);
3811 return err ?: len;
a94213b1
N		 3812}
3813static struct md_sysfs_entry md_resync_start =
750f199e
N		 3814__ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR,
3815 resync_start_show, resync_start_store);
a94213b1 3816
9e653b63
N		 3817/*
3818 * The array state can be:
3819 *
3820 * clear
3821 * No devices, no size, no level
3822 * Equivalent to STOP_ARRAY ioctl
3823 * inactive
3824 * May have some settings, but array is not active
3825 * all IO results in error
3826 * When written, doesn't tear down array, but just stops it
3827 * suspended (not supported yet)
3828 * All IO requests will block. The array can be reconfigured.
910d8cb3 3829 * Writing this, if accepted, will block until array is quiescent
9e653b63
N		 3830 * readonly
3831 * no resync can happen. no superblocks get written.
3832 * write requests fail
3833 * read-auto
3834 * like readonly, but behaves like 'clean' on a write request.
3835 *
3836 * clean - no pending writes, but otherwise active.
3837 * When written to inactive array, starts without resync
3838 * If a write request arrives then
3839 * if metadata is known, mark 'dirty' and switch to 'active'.
3840 * if not known, block and switch to write-pending
3841 * If written to an active array that has pending writes, then fails.
3842 * active
3843 * fully active: IO and resync can be happening.
3844 * When written to inactive array, starts with resync
3845 *
3846 * write-pending
3847 * clean, but writes are blocked waiting for 'active' to be written.
3848 *
3849 * active-idle
3850 * like active, but no writes have been seen for a while (100msec).
3851 *
3852 */
3853enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3854 write_pending, active_idle, bad_word};
05381954 3855static char *array_states[] = {
9e653b63
N		 3856 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3857 "write-pending", "active-idle", NULL };
3858
3859static int match_word(const char *word, char **list)
3860{
3861 int n;
3862 for (n=0; list[n]; n++)
3863 if (cmd_match(word, list[n]))
3864 break;
3865 return n;
3866}
3867
3868static ssize_t
fd01b88c 3869array_state_show(struct mddev *mddev, char *page)
9e653b63
N		 3870{
3871 enum array_state st = inactive;
3872
3873 if (mddev->pers)
3874 switch(mddev->ro) {
3875 case 1:
3876 st = readonly;
3877 break;
3878 case 2:
3879 st = read_auto;
3880 break;
3881 case 0:
3882 if (mddev->in_sync)
3883 st = clean;
070dc6dd 3884 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
e691063a 3885 st = write_pending;
9e653b63
N		 3886 else if (mddev->safemode)
3887 st = active_idle;
3888 else
3889 st = active;
3890 }
3891 else {
3892 if (list_empty(&mddev->disks) &&
3893 mddev->raid_disks == 0 &&
58c0fed4 3894 mddev->dev_sectors == 0)
9e653b63
N		 3895 st = clear;
3896 else
3897 st = inactive;
3898 }
3899 return sprintf(page, "%s\n", array_states[st]);
3900}
3901
f72ffdd6
N		 3902static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev);
3903static int md_set_readonly(struct mddev *mddev, struct block_device *bdev);
3904static int do_md_run(struct mddev *mddev);
fd01b88c 3905static int restart_array(struct mddev *mddev);
9e653b63
N		 3906
3907static ssize_t
fd01b88c 3908array_state_store(struct mddev *mddev, const char *buf, size_t len)
9e653b63 3909{
6791875e 3910 int err;
9e653b63 3911 enum array_state st = match_word(buf, array_states);
6791875e
N		 3912
3913 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
3914 /* don't take reconfig_mutex when toggling between
3915 * clean and active
3916 */
3917 spin_lock(&mddev->lock);
3918 if (st == active) {
3919 restart_array(mddev);
3920 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
3921 wake_up(&mddev->sb_wait);
3922 err = 0;
3923 } else /* st == clean */ {
3924 restart_array(mddev);
3925 if (atomic_read(&mddev->writes_pending) == 0) {
3926 if (mddev->in_sync == 0) {
3927 mddev->in_sync = 1;
3928 if (mddev->safemode == 1)
3929 mddev->safemode = 0;
3930 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
3931 }
3932 err = 0;
3933 } else
3934 err = -EBUSY;
3935 }
3936 spin_unlock(&mddev->lock);
c008f1d3 3937 return err ?: len;
6791875e
N		 3938 }
3939 err = mddev_lock(mddev);
3940 if (err)
3941 return err;
3942 err = -EINVAL;
9e653b63
N		 3943 switch(st) {
3944 case bad_word:
3945 break;
3946 case clear:
3947 /* stopping an active array */
a05b7ea0 3948 err = do_md_stop(mddev, 0, NULL);
9e653b63
N		 3949 break;
3950 case inactive:
3951 /* stopping an active array */
90cf195d 3952 if (mddev->pers)
a05b7ea0 3953 err = do_md_stop(mddev, 2, NULL);
90cf195d 3954 else
e691063a 3955 err = 0; /* already inactive */
9e653b63
N		 3956 break;
3957 case suspended:
3958 break; /* not supported yet */
3959 case readonly:
3960 if (mddev->pers)
a05b7ea0 3961 err = md_set_readonly(mddev, NULL);
9e653b63
N		 3962 else {
3963 mddev->ro = 1;
648b629e 3964 set_disk_ro(mddev->gendisk, 1);
9e653b63
N		 3965 err = do_md_run(mddev);
3966 }
3967 break;
3968 case read_auto:
9e653b63 3969 if (mddev->pers) {
80268ee9 3970 if (mddev->ro == 0)
a05b7ea0 3971 err = md_set_readonly(mddev, NULL);
80268ee9 3972 else if (mddev->ro == 1)
648b629e
N		 3973 err = restart_array(mddev);
3974 if (err == 0) {
3975 mddev->ro = 2;
3976 set_disk_ro(mddev->gendisk, 0);
3977 }
9e653b63
N		 3978 } else {
3979 mddev->ro = 2;
3980 err = do_md_run(mddev);
3981 }
3982 break;
3983 case clean:
3984 if (mddev->pers) {
339421de
SL		 3985 err = restart_array(mddev);
3986 if (err)
3987 break;
85572d7c 3988 spin_lock(&mddev->lock);
9e653b63 3989 if (atomic_read(&mddev->writes_pending) == 0) {
e691063a
N		 3990 if (mddev->in_sync == 0) {
3991 mddev->in_sync = 1;
31a59e34
N		 3992 if (mddev->safemode == 1)
3993 mddev->safemode = 0;
070dc6dd 3994 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
e691063a
N		 3995 }
3996 err = 0;
3997 } else
3998 err = -EBUSY;
85572d7c 3999 spin_unlock(&mddev->lock);
5bf29597
N		 4000 } else
4001 err = -EINVAL;
9e653b63
N		 4002 break;
4003 case active:
4004 if (mddev->pers) {
339421de
SL		 4005 err = restart_array(mddev);
4006 if (err)
4007 break;
070dc6dd 4008 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
9e653b63
N		 4009 wake_up(&mddev->sb_wait);
4010 err = 0;
4011 } else {
4012 mddev->ro = 0;
648b629e 4013 set_disk_ro(mddev->gendisk, 0);
9e653b63
N		 4014 err = do_md_run(mddev);
4015 }
4016 break;
4017 case write_pending:
4018 case active_idle:
4019 /* these cannot be set */
4020 break;
4021 }
6791875e
N		 4022
4023 if (!err) {
1d23f178
N		 4024 if (mddev->hold_active == UNTIL_IOCTL)
4025 mddev->hold_active = 0;
00bcb4ac 4026 sysfs_notify_dirent_safe(mddev->sysfs_state);
0fd62b86 4027 }
6791875e
N		 4028 mddev_unlock(mddev);
4029 return err ?: len;
9e653b63 4030}
80ca3a44 4031static struct md_sysfs_entry md_array_state =
750f199e 4032__ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
9e653b63 4033
1e50915f 4034static ssize_t
fd01b88c 4035max_corrected_read_errors_show(struct mddev *mddev, char *page) {
1e50915f
RB		 4036 return sprintf(page, "%d\n",
4037 atomic_read(&mddev->max_corr_read_errors));
4038}
4039
4040static ssize_t
fd01b88c 4041max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
1e50915f 4042{
4c9309c0
AD		 4043 unsigned int n;
4044 int rv;
1e50915f 4045
4c9309c0
AD		 4046 rv = kstrtouint(buf, 10, &n);
4047 if (rv < 0)
4048 return rv;
4049 atomic_set(&mddev->max_corr_read_errors, n);
4050 return len;
1e50915f
RB		 4051}
4052
4053static struct md_sysfs_entry max_corr_read_errors =
4054__ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
4055 max_corrected_read_errors_store);
4056
6d7ff738 4057static ssize_t
fd01b88c 4058null_show(struct mddev *mddev, char *page)
6d7ff738
N		 4059{
4060 return -EINVAL;
4061}
4062
4063static ssize_t
fd01b88c 4064new_dev_store(struct mddev *mddev, const char *buf, size_t len)
6d7ff738
N		 4065{
4066 /* buf must be %d:%d\n? giving major and minor numbers */
4067 /* The new device is added to the array.
4068 * If the array has a persistent superblock, we read the
4069 * superblock to initialise info and check validity.
4070 * Otherwise, only checking done is that in bind_rdev_to_array,
4071 * which mainly checks size.
4072 */
4073 char *e;
4074 int major = simple_strtoul(buf, &e, 10);
4075 int minor;
4076 dev_t dev;
3cb03002 4077 struct md_rdev *rdev;
6d7ff738
N		 4078 int err;
4079
4080 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
4081 return -EINVAL;
4082 minor = simple_strtoul(e+1, &e, 10);
4083 if (*e && *e != '\n')
4084 return -EINVAL;
4085 dev = MKDEV(major, minor);
4086 if (major != MAJOR(dev) ||
4087 minor != MINOR(dev))
4088 return -EOVERFLOW;
4089
6791875e
N		 4090 flush_workqueue(md_misc_wq);
4091
4092 err = mddev_lock(mddev);
4093 if (err)
4094 return err;
6d7ff738
N		 4095 if (mddev->persistent) {
4096 rdev = md_import_device(dev, mddev->major_version,
4097 mddev->minor_version);
4098 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3cb03002
N		 4099 struct md_rdev *rdev0
4100 = list_entry(mddev->disks.next,
4101 struct md_rdev, same_set);
6d7ff738
N		 4102 err = super_types[mddev->major_version]
4103 .load_super(rdev, rdev0, mddev->minor_version);
4104 if (err < 0)
4105 goto out;
4106 }
c5d79adb
N		 4107 } else if (mddev->external)
4108 rdev = md_import_device(dev, -2, -1);
4109 else
6d7ff738
N		 4110 rdev = md_import_device(dev, -1, -1);
4111
9a8c0fa8
N		 4112 if (IS_ERR(rdev)) {
4113 mddev_unlock(mddev);
6d7ff738 4114 return PTR_ERR(rdev);
9a8c0fa8 4115 }
6d7ff738
N		 4116 err = bind_rdev_to_array(rdev, mddev);
4117 out:
4118 if (err)
4119 export_rdev(rdev);
6791875e 4120 mddev_unlock(mddev);
6d7ff738
N		 4121 return err ? err : len;
4122}
4123
4124static struct md_sysfs_entry md_new_device =
80ca3a44 4125__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3b34380a 4126
9b1d1dac 4127static ssize_t
fd01b88c 4128bitmap_store(struct mddev *mddev, const char *buf, size_t len)
9b1d1dac
PC		 4129{
4130 char *end;
4131 unsigned long chunk, end_chunk;
6791875e 4132 int err;
9b1d1dac 4133
6791875e
N		 4134 err = mddev_lock(mddev);
4135 if (err)
4136 return err;
9b1d1dac
PC		 4137 if (!mddev->bitmap)
4138 goto out;
4139 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4140 while (*buf) {
4141 chunk = end_chunk = simple_strtoul(buf, &end, 0);
4142 if (buf == end) break;
4143 if (*end == '-') { /* range */
4144 buf = end + 1;
4145 end_chunk = simple_strtoul(buf, &end, 0);
4146 if (buf == end) break;
4147 }
4148 if (*end && !isspace(*end)) break;
4149 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
e7d2860b 4150 buf = skip_spaces(end);
9b1d1dac
PC		 4151 }
4152 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
4153out:
6791875e 4154 mddev_unlock(mddev);
9b1d1dac
PC		 4155 return len;
4156}
4157
4158static struct md_sysfs_entry md_bitmap =
4159__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
4160
a35b0d69 4161static ssize_t
fd01b88c 4162size_show(struct mddev *mddev, char *page)
a35b0d69 4163{
58c0fed4
AN		 4164 return sprintf(page, "%llu\n",
4165 (unsigned long long)mddev->dev_sectors / 2);
a35b0d69
N		 4166}
4167
fd01b88c 4168static int update_size(struct mddev *mddev, sector_t num_sectors);
a35b0d69
N		 4169
4170static ssize_t
fd01b88c 4171size_store(struct mddev *mddev, const char *buf, size_t len)
a35b0d69
N		 4172{
4173 /* If array is inactive, we can reduce the component size, but
4174 * not increase it (except from 0).
4175 * If array is active, we can try an on-line resize
4176 */
b522adcd
DW		 4177 sector_t sectors;
4178 int err = strict_blocks_to_sectors(buf, &sectors);
a35b0d69 4179
58c0fed4
AN		 4180 if (err < 0)
4181 return err;
6791875e
N		 4182 err = mddev_lock(mddev);
4183 if (err)
4184 return err;
a35b0d69 4185 if (mddev->pers) {
58c0fed4 4186 err = update_size(mddev, sectors);
850b2b42 4187 md_update_sb(mddev, 1);
a35b0d69 4188 } else {
58c0fed4
AN		 4189 if (mddev->dev_sectors == 0 ||
4190 mddev->dev_sectors > sectors)
4191 mddev->dev_sectors = sectors;
a35b0d69
N		 4192 else
4193 err = -ENOSPC;
4194 }
6791875e 4195 mddev_unlock(mddev);
a35b0d69
N		 4196 return err ? err : len;
4197}
4198
4199static struct md_sysfs_entry md_size =
80ca3a44 4200__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
a35b0d69 4201
83f0d77a 4202/* Metadata version.
e691063a
N		 4203 * This is one of
4204 * 'none' for arrays with no metadata (good luck...)
4205 * 'external' for arrays with externally managed metadata,
8bb93aac
N		 4206 * or N.M for internally known formats
4207 */
4208static ssize_t
fd01b88c 4209metadata_show(struct mddev *mddev, char *page)
8bb93aac
N		 4210{
4211 if (mddev->persistent)
4212 return sprintf(page, "%d.%d\n",
4213 mddev->major_version, mddev->minor_version);
e691063a
N		 4214 else if (mddev->external)
4215 return sprintf(page, "external:%s\n", mddev->metadata_type);
8bb93aac
N		 4216 else
4217 return sprintf(page, "none\n");
4218}
4219
4220static ssize_t
fd01b88c 4221metadata_store(struct mddev *mddev, const char *buf, size_t len)
8bb93aac
N		 4222{
4223 int major, minor;
4224 char *e;
6791875e 4225 int err;
ea43ddd8
N		 4226 /* Changing the details of 'external' metadata is
4227 * always permitted. Otherwise there must be
4228 * no devices attached to the array.
4229 */
6791875e
N		 4230
4231 err = mddev_lock(mddev);
4232 if (err)
4233 return err;
4234 err = -EBUSY;
ea43ddd8
N		 4235 if (mddev->external && strncmp(buf, "external:", 9) == 0)
4236 ;
4237 else if (!list_empty(&mddev->disks))
6791875e 4238 goto out_unlock;
8bb93aac 4239
6791875e 4240 err = 0;
8bb93aac
N		 4241 if (cmd_match(buf, "none")) {
4242 mddev->persistent = 0;
e691063a
N		 4243 mddev->external = 0;
4244 mddev->major_version = 0;
4245 mddev->minor_version = 90;
6791875e 4246 goto out_unlock;
e691063a
N		 4247 }
4248 if (strncmp(buf, "external:", 9) == 0) {
20a49ff6 4249 size_t namelen = len-9;
e691063a
N		 4250 if (namelen >= sizeof(mddev->metadata_type))
4251 namelen = sizeof(mddev->metadata_type)-1;
4252 strncpy(mddev->metadata_type, buf+9, namelen);
4253 mddev->metadata_type[namelen] = 0;
4254 if (namelen && mddev->metadata_type[namelen-1] == '\n')
4255 mddev->metadata_type[--namelen] = 0;
4256 mddev->persistent = 0;
4257 mddev->external = 1;
8bb93aac
N		 4258 mddev->major_version = 0;
4259 mddev->minor_version = 90;
6791875e 4260 goto out_unlock;
8bb93aac
N		 4261 }
4262 major = simple_strtoul(buf, &e, 10);
6791875e 4263 err = -EINVAL;
8bb93aac 4264 if (e==buf || *e != '.')
6791875e 4265 goto out_unlock;
8bb93aac
N		 4266 buf = e+1;
4267 minor = simple_strtoul(buf, &e, 10);
3f9d7b0d 4268 if (e==buf || (*e && *e != '\n') )
6791875e
N		 4269 goto out_unlock;
4270 err = -ENOENT;
50511da3 4271 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
6791875e 4272 goto out_unlock;
8bb93aac
N		 4273 mddev->major_version = major;
4274 mddev->minor_version = minor;
4275 mddev->persistent = 1;
e691063a 4276 mddev->external = 0;
6791875e
N		 4277 err = 0;
4278out_unlock:
4279 mddev_unlock(mddev);
4280 return err ?: len;
8bb93aac
N		 4281}
4282
4283static struct md_sysfs_entry md_metadata =
750f199e 4284__ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
8bb93aac 4285
24dd469d 4286static ssize_t
fd01b88c 4287action_show(struct mddev *mddev, char *page)
24dd469d 4288{
7eec314d 4289 char *type = "idle";
b7b17c9b
N		 4290 unsigned long recovery = mddev->recovery;
4291 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
b6a9ce68 4292 type = "frozen";
b7b17c9b
N		 4293 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
4294 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
4295 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
ccfcc3c1 4296 type = "reshape";
b7b17c9b
N		 4297 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
4298 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
24dd469d 4299 type = "resync";
b7b17c9b 4300 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
24dd469d
N		 4301 type = "check";
4302 else
4303 type = "repair";
b7b17c9b 4304 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
24dd469d 4305 type = "recover";
985ca973
N		 4306 else if (mddev->reshape_position != MaxSector)
4307 type = "reshape";
24dd469d
N		 4308 }
4309 return sprintf(page, "%s\n", type);
4310}
4311
4312static ssize_t
fd01b88c 4313action_store(struct mddev *mddev, const char *page, size_t len)
24dd469d 4314{
7eec314d
N		 4315 if (!mddev->pers || !mddev->pers->sync_request)
4316 return -EINVAL;
4317
b6a9ce68
N		 4318
4319 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
56ccc112
N		 4320 if (cmd_match(page, "frozen"))
4321 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4322 else
4323 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
8e8e2518
N		 4324 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4325 mddev_lock(mddev) == 0) {
4326 flush_workqueue(md_misc_wq);
4327 if (mddev->sync_thread) {
4328 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6791875e 4329 md_reap_sync_thread(mddev);
6791875e 4330 }
8e8e2518 4331 mddev_unlock(mddev);
7eec314d 4332 }
312045ee 4333 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
24dd469d 4334 return -EBUSY;
72a23c21 4335 else if (cmd_match(page, "resync"))
56ccc112 4336 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
72a23c21 4337 else if (cmd_match(page, "recover")) {
56ccc112 4338 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
72a23c21 4339 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
72a23c21 4340 } else if (cmd_match(page, "reshape")) {
16484bf5
N		 4341 int err;
4342 if (mddev->pers->start_reshape == NULL)
4343 return -EINVAL;
6791875e
N		 4344 err = mddev_lock(mddev);
4345 if (!err) {
312045ee
N		 4346 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4347 err = -EBUSY;
4348 else {
4349 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4350 err = mddev->pers->start_reshape(mddev);
4351 }
6791875e
N		 4352 mddev_unlock(mddev);
4353 }
16484bf5
N		 4354 if (err)
4355 return err;
a99ac971 4356 sysfs_notify(&mddev->kobj, NULL, "degraded");
16484bf5 4357 } else {
bce74dac 4358 if (cmd_match(page, "check"))
7eec314d 4359 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2adc7d47 4360 else if (!cmd_match(page, "repair"))
7eec314d 4361 return -EINVAL;
56ccc112 4362 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
7eec314d
N		 4363 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4364 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7eec314d 4365 }
48c26ddc
N		 4366 if (mddev->ro == 2) {
4367 /* A write to sync_action is enough to justify
4368 * canceling read-auto mode
4369 */
4370 mddev->ro = 0;
4371 md_wakeup_thread(mddev->sync_thread);
4372 }
03c902e1 4373 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
24dd469d 4374 md_wakeup_thread(mddev->thread);
00bcb4ac 4375 sysfs_notify_dirent_safe(mddev->sysfs_action);
24dd469d
N		 4376 return len;
4377}
4378
c4a39551 4379static struct md_sysfs_entry md_scan_mode =
750f199e 4380__ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
c4a39551
JB		 4381
4382static ssize_t
4383last_sync_action_show(struct mddev *mddev, char *page)
4384{
4385 return sprintf(page, "%s\n", mddev->last_sync_action);
4386}
4387
4388static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action);
4389
9d88883e 4390static ssize_t
fd01b88c 4391mismatch_cnt_show(struct mddev *mddev, char *page)
9d88883e
N		 4392{
4393 return sprintf(page, "%llu\n",
7f7583d4
JM		 4394 (unsigned long long)
4395 atomic64_read(&mddev->resync_mismatches));
9d88883e
N		 4396}
4397
80ca3a44 4398static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
9d88883e 4399
88202a0c 4400static ssize_t
fd01b88c 4401sync_min_show(struct mddev *mddev, char *page)
88202a0c
N		 4402{
4403 return sprintf(page, "%d (%s)\n", speed_min(mddev),
4404 mddev->sync_speed_min ? "local": "system");
4405}
4406
4407static ssize_t
fd01b88c 4408sync_min_store(struct mddev *mddev, const char *buf, size_t len)
88202a0c 4409{
4c9309c0
AD		 4410 unsigned int min;
4411 int rv;
4412
88202a0c 4413 if (strncmp(buf, "system", 6)==0) {
4c9309c0
AD		 4414 min = 0;
4415 } else {
4416 rv = kstrtouint(buf, 10, &min);
4417 if (rv < 0)
4418 return rv;
4419 if (min == 0)
4420 return -EINVAL;
88202a0c 4421 }
88202a0c
N		 4422 mddev->sync_speed_min = min;
4423 return len;
4424}
4425
4426static struct md_sysfs_entry md_sync_min =
4427__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
4428
4429static ssize_t
fd01b88c 4430sync_max_show(struct mddev *mddev, char *page)
88202a0c
N		 4431{
4432 return sprintf(page, "%d (%s)\n", speed_max(mddev),
4433 mddev->sync_speed_max ? "local": "system");
4434}
4435
4436static ssize_t
fd01b88c 4437sync_max_store(struct mddev *mddev, const char *buf, size_t len)
88202a0c 4438{
4c9309c0
AD		 4439 unsigned int max;
4440 int rv;
4441
88202a0c 4442 if (strncmp(buf, "system", 6)==0) {
4c9309c0
AD		 4443 max = 0;
4444 } else {
4445 rv = kstrtouint(buf, 10, &max);
4446 if (rv < 0)
4447 return rv;
4448 if (max == 0)
4449 return -EINVAL;
88202a0c 4450 }
88202a0c
N		 4451 mddev->sync_speed_max = max;
4452 return len;
4453}
4454
4455static struct md_sysfs_entry md_sync_max =
4456__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
4457
d7f3d291 4458static ssize_t
fd01b88c 4459degraded_show(struct mddev *mddev, char *page)
d7f3d291
IP		 4460{
4461 return sprintf(page, "%d\n", mddev->degraded);
4462}
4463static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
88202a0c 4464
90b08710 4465static ssize_t
fd01b88c 4466sync_force_parallel_show(struct mddev *mddev, char *page)
90b08710
BS		 4467{
4468 return sprintf(page, "%d\n", mddev->parallel_resync);
4469}
4470
4471static ssize_t
fd01b88c 4472sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
90b08710
BS		 4473{
4474 long n;
4475
b29bebd6 4476 if (kstrtol(buf, 10, &n))
90b08710
BS		 4477 return -EINVAL;
4478
4479 if (n != 0 && n != 1)
4480 return -EINVAL;
4481
4482 mddev->parallel_resync = n;
4483
4484 if (mddev->sync_thread)
4485 wake_up(&resync_wait);
4486
4487 return len;
4488}
4489
4490/* force parallel resync, even with shared block devices */
4491static struct md_sysfs_entry md_sync_force_parallel =
4492__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
4493 sync_force_parallel_show, sync_force_parallel_store);
4494
88202a0c 4495static ssize_t
fd01b88c 4496sync_speed_show(struct mddev *mddev, char *page)
88202a0c
N		 4497{
4498 unsigned long resync, dt, db;
d1a7c503
N		 4499 if (mddev->curr_resync == 0)
4500 return sprintf(page, "none\n");
9687a60c
AN		 4501 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
4502 dt = (jiffies - mddev->resync_mark) / HZ;
88202a0c 4503 if (!dt) dt++;
9687a60c
AN		 4504 db = resync - mddev->resync_mark_cnt;
4505 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
88202a0c
N		 4506}
4507
80ca3a44 4508static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
88202a0c
N		 4509
4510static ssize_t
fd01b88c 4511sync_completed_show(struct mddev *mddev, char *page)
88202a0c 4512{
13ae864b 4513 unsigned long long max_sectors, resync;
88202a0c 4514
acb180b0
N		 4515 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
4516 return sprintf(page, "none\n");
4517
72f36d59
N		 4518 if (mddev->curr_resync == 1 ||
4519 mddev->curr_resync == 2)
4520 return sprintf(page, "delayed\n");
4521
c804cdec
N		 4522 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
4523 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
58c0fed4 4524 max_sectors = mddev->resync_max_sectors;
88202a0c 4525 else
58c0fed4 4526 max_sectors = mddev->dev_sectors;
88202a0c 4527
acb180b0 4528 resync = mddev->curr_resync_completed;
13ae864b 4529 return sprintf(page, "%llu / %llu\n", resync, max_sectors);
88202a0c
N		 4530}
4531
750f199e
N		 4532static struct md_sysfs_entry md_sync_completed =
4533 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL);
88202a0c 4534
5e96ee65 4535static ssize_t
fd01b88c 4536min_sync_show(struct mddev *mddev, char *page)
5e96ee65
NB		 4537{
4538 return sprintf(page, "%llu\n",
4539 (unsigned long long)mddev->resync_min);
4540}
4541static ssize_t
fd01b88c 4542min_sync_store(struct mddev *mddev, const char *buf, size_t len)
5e96ee65
NB		 4543{
4544 unsigned long long min;
23da422b 4545 int err;
23da422b 4546
b29bebd6 4547 if (kstrtoull(buf, 10, &min))
5e96ee65 4548 return -EINVAL;
23da422b
N		 4549
4550 spin_lock(&mddev->lock);
4551 err = -EINVAL;
5e96ee65 4552 if (min > mddev->resync_max)
23da422b
N		 4553 goto out_unlock;
4554
4555 err = -EBUSY;
5e96ee65 4556 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
23da422b 4557 goto out_unlock;
5e96ee65 4558
50c37b13
N		 4559 /* Round down to multiple of 4K for safety */
4560 mddev->resync_min = round_down(min, 8);
23da422b 4561 err = 0;
5e96ee65 4562
23da422b
N		 4563out_unlock:
4564 spin_unlock(&mddev->lock);
4565 return err ?: len;
5e96ee65
NB		 4566}
4567
4568static struct md_sysfs_entry md_min_sync =
4569__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
4570
c6207277 4571static ssize_t
fd01b88c 4572max_sync_show(struct mddev *mddev, char *page)
c6207277
N		 4573{
4574 if (mddev->resync_max == MaxSector)
4575 return sprintf(page, "max\n");
4576 else
4577 return sprintf(page, "%llu\n",
4578 (unsigned long long)mddev->resync_max);
4579}
4580static ssize_t
fd01b88c 4581max_sync_store(struct mddev *mddev, const char *buf, size_t len)
c6207277 4582{
23da422b
N		 4583 int err;
4584 spin_lock(&mddev->lock);
c6207277
N		 4585 if (strncmp(buf, "max", 3) == 0)
4586 mddev->resync_max = MaxSector;
4587 else {
5e96ee65 4588 unsigned long long max;
23da422b
N		 4589 int chunk;
4590
4591 err = -EINVAL;
b29bebd6 4592 if (kstrtoull(buf, 10, &max))
23da422b 4593 goto out_unlock;
5e96ee65 4594 if (max < mddev->resync_min)
23da422b
N		 4595 goto out_unlock;
4596
4597 err = -EBUSY;
c6207277 4598 if (max < mddev->resync_max &&
4d484a4a 4599 mddev->ro == 0 &&
c6207277 4600 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
23da422b 4601 goto out_unlock;
c6207277
N		 4602
4603 /* Must be a multiple of chunk_size */
23da422b
N		 4604 chunk = mddev->chunk_sectors;
4605 if (chunk) {
2ac06c33 4606 sector_t temp = max;
23da422b
N		 4607
4608 err = -EINVAL;
4609 if (sector_div(temp, chunk))
4610 goto out_unlock;
c6207277
N		 4611 }
4612 mddev->resync_max = max;
4613 }
4614 wake_up(&mddev->recovery_wait);
23da422b
N		 4615 err = 0;
4616out_unlock:
4617 spin_unlock(&mddev->lock);
4618 return err ?: len;
c6207277
N		 4619}
4620
4621static struct md_sysfs_entry md_max_sync =
4622__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
4623
e464eafd 4624static ssize_t
fd01b88c 4625suspend_lo_show(struct mddev *mddev, char *page)
e464eafd
N		 4626{
4627 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
4628}
4629
4630static ssize_t
fd01b88c 4631suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
e464eafd 4632{
4c9309c0 4633 unsigned long long old, new;
6791875e 4634 int err;
e464eafd 4635
4c9309c0
AD		 4636 err = kstrtoull(buf, 10, &new);
4637 if (err < 0)
4638 return err;
4639 if (new != (sector_t)new)
e464eafd 4640 return -EINVAL;
23ddff37 4641
6791875e
N		 4642 err = mddev_lock(mddev);
4643 if (err)
4644 return err;
4645 err = -EINVAL;
4646 if (mddev->pers == NULL ||
4647 mddev->pers->quiesce == NULL)
4648 goto unlock;
4649 old = mddev->suspend_lo;
23ddff37
N		 4650 mddev->suspend_lo = new;
4651 if (new >= old)
4652 /* Shrinking suspended region */
e464eafd 4653 mddev->pers->quiesce(mddev, 2);
23ddff37
N		 4654 else {
4655 /* Expanding suspended region - need to wait */
4656 mddev->pers->quiesce(mddev, 1);
4657 mddev->pers->quiesce(mddev, 0);
4658 }
6791875e
N		 4659 err = 0;
4660unlock:
4661 mddev_unlock(mddev);
4662 return err ?: len;
e464eafd
N		 4663}
4664static struct md_sysfs_entry md_suspend_lo =
4665__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
4666
e464eafd 4667static ssize_t
fd01b88c 4668suspend_hi_show(struct mddev *mddev, char *page)
e464eafd
N		 4669{
4670 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
4671}
4672
4673static ssize_t
fd01b88c 4674suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
e464eafd 4675{
4c9309c0 4676 unsigned long long old, new;
6791875e 4677 int err;
e464eafd 4678
4c9309c0
AD		 4679 err = kstrtoull(buf, 10, &new);
4680 if (err < 0)
4681 return err;
4682 if (new != (sector_t)new)
e464eafd 4683 return -EINVAL;
23ddff37 4684
6791875e
N		 4685 err = mddev_lock(mddev);
4686 if (err)
4687 return err;
4688 err = -EINVAL;
4689 if (mddev->pers == NULL ||
4690 mddev->pers->quiesce == NULL)
4691 goto unlock;
4692 old = mddev->suspend_hi;
23ddff37
N		 4693 mddev->suspend_hi = new;
4694 if (new <= old)
4695 /* Shrinking suspended region */
4696 mddev->pers->quiesce(mddev, 2);
4697 else {
4698 /* Expanding suspended region - need to wait */
e464eafd
N		 4699 mddev->pers->quiesce(mddev, 1);
4700 mddev->pers->quiesce(mddev, 0);
23ddff37 4701 }
6791875e
N		 4702 err = 0;
4703unlock:
4704 mddev_unlock(mddev);
4705 return err ?: len;
e464eafd
N		 4706}
4707static struct md_sysfs_entry md_suspend_hi =
4708__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
4709
08a02ecd 4710static ssize_t
fd01b88c 4711reshape_position_show(struct mddev *mddev, char *page)
08a02ecd
N		 4712{
4713 if (mddev->reshape_position != MaxSector)
4714 return sprintf(page, "%llu\n",
4715 (unsigned long long)mddev->reshape_position);
4716 strcpy(page, "none\n");
4717 return 5;
4718}
4719
4720static ssize_t
fd01b88c 4721reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
08a02ecd 4722{
c6563a8c 4723 struct md_rdev *rdev;
4c9309c0 4724 unsigned long long new;
6791875e 4725 int err;
6791875e 4726
4c9309c0
AD		 4727 err = kstrtoull(buf, 10, &new);
4728 if (err < 0)
4729 return err;
4730 if (new != (sector_t)new)
08a02ecd 4731 return -EINVAL;
6791875e
N		 4732 err = mddev_lock(mddev);
4733 if (err)
4734 return err;
4735 err = -EBUSY;
4736 if (mddev->pers)
4737 goto unlock;
08a02ecd
N		 4738 mddev->reshape_position = new;
4739 mddev->delta_disks = 0;
2c810cdd 4740 mddev->reshape_backwards = 0;
08a02ecd
N		 4741 mddev->new_level = mddev->level;
4742 mddev->new_layout = mddev->layout;
664e7c41 4743 mddev->new_chunk_sectors = mddev->chunk_sectors;
c6563a8c
N		 4744 rdev_for_each(rdev, mddev)
4745 rdev->new_data_offset = rdev->data_offset;
6791875e
N		 4746 err = 0;
4747unlock:
4748 mddev_unlock(mddev);
4749 return err ?: len;
08a02ecd
N		 4750}
4751
4752static struct md_sysfs_entry md_reshape_position =
4753__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4754 reshape_position_store);
4755
2c810cdd
N		 4756static ssize_t
4757reshape_direction_show(struct mddev *mddev, char *page)
4758{
4759 return sprintf(page, "%s\n",
4760 mddev->reshape_backwards ? "backwards" : "forwards");
4761}
4762
4763static ssize_t
4764reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
4765{
4766 int backwards = 0;
6791875e
N		 4767 int err;
4768
2c810cdd
N		 4769 if (cmd_match(buf, "forwards"))
4770 backwards = 0;
4771 else if (cmd_match(buf, "backwards"))
4772 backwards = 1;
4773 else
4774 return -EINVAL;
4775 if (mddev->reshape_backwards == backwards)
4776 return len;
4777
6791875e
N		 4778 err = mddev_lock(mddev);
4779 if (err)
4780 return err;
2c810cdd
N		 4781 /* check if we are allowed to change */
4782 if (mddev->delta_disks)
6791875e
N		 4783 err = -EBUSY;
4784 else if (mddev->persistent &&
2c810cdd 4785 mddev->major_version == 0)
6791875e
N		 4786 err = -EINVAL;
4787 else
4788 mddev->reshape_backwards = backwards;
4789 mddev_unlock(mddev);
4790 return err ?: len;
2c810cdd
N		 4791}
4792
4793static struct md_sysfs_entry md_reshape_direction =
4794__ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
4795 reshape_direction_store);
4796
b522adcd 4797static ssize_t
fd01b88c 4798array_size_show(struct mddev *mddev, char *page)
b522adcd
DW		 4799{
4800 if (mddev->external_size)
4801 return sprintf(page, "%llu\n",
4802 (unsigned long long)mddev->array_sectors/2);
4803 else
4804 return sprintf(page, "default\n");
4805}
4806
4807static ssize_t
fd01b88c 4808array_size_store(struct mddev *mddev, const char *buf, size_t len)
b522adcd
DW		 4809{
4810 sector_t sectors;
6791875e
N		 4811 int err;
4812
4813 err = mddev_lock(mddev);
4814 if (err)
4815 return err;
b522adcd
DW		 4816
4817 if (strncmp(buf, "default", 7) == 0) {
4818 if (mddev->pers)
4819 sectors = mddev->pers->size(mddev, 0, 0);
4820 else
4821 sectors = mddev->array_sectors;
4822
4823 mddev->external_size = 0;
4824 } else {
4825 if (strict_blocks_to_sectors(buf, &sectors) < 0)
6791875e
N		 4826 err = -EINVAL;
4827 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
4828 err = -E2BIG;
4829 else
4830 mddev->external_size = 1;
b522adcd
DW		 4831 }
4832
6791875e
N		 4833 if (!err) {
4834 mddev->array_sectors = sectors;
4835 if (mddev->pers) {
4836 set_capacity(mddev->gendisk, mddev->array_sectors);
4837 revalidate_disk(mddev->gendisk);
4838 }
cbe6ef1d 4839 }
6791875e
N		 4840 mddev_unlock(mddev);
4841 return err ?: len;
b522adcd
DW		 4842}
4843
4844static struct md_sysfs_entry md_array_size =
4845__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4846 array_size_store);
e464eafd 4847
eae1701f
N		 4848static struct attribute *md_default_attrs[] = {
4849 &md_level.attr,
d4dbd025 4850 &md_layout.attr,
eae1701f 4851 &md_raid_disks.attr,
3b34380a 4852 &md_chunk_size.attr,
a35b0d69 4853 &md_size.attr,
a94213b1 4854 &md_resync_start.attr,
8bb93aac 4855 &md_metadata.attr,
6d7ff738 4856 &md_new_device.attr,
16f17b39 4857 &md_safe_delay.attr,
9e653b63 4858 &md_array_state.attr,
08a02ecd 4859 &md_reshape_position.attr,
2c810cdd 4860 &md_reshape_direction.attr,
b522adcd 4861 &md_array_size.attr,
1e50915f 4862 &max_corr_read_errors.attr,
411036fa
N		 4863 NULL,
4864};
4865
4866static struct attribute *md_redundancy_attrs[] = {
24dd469d 4867 &md_scan_mode.attr,
c4a39551 4868 &md_last_scan_mode.attr,
9d88883e 4869 &md_mismatches.attr,
88202a0c
N		 4870 &md_sync_min.attr,
4871 &md_sync_max.attr,
4872 &md_sync_speed.attr,
90b08710 4873 &md_sync_force_parallel.attr,
88202a0c 4874 &md_sync_completed.attr,
5e96ee65 4875 &md_min_sync.attr,
c6207277 4876 &md_max_sync.attr,
e464eafd
N		 4877 &md_suspend_lo.attr,
4878 &md_suspend_hi.attr,
9b1d1dac 4879 &md_bitmap.attr,
d7f3d291 4880 &md_degraded.attr,
eae1701f
N		 4881 NULL,
4882};
411036fa
N		 4883static struct attribute_group md_redundancy_group = {
4884 .name = NULL,
4885 .attrs = md_redundancy_attrs,
4886};
4887
eae1701f
N		 4888static ssize_t
4889md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4890{
4891 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
fd01b88c 4892 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
96de1e66 4893 ssize_t rv;
eae1701f
N		 4894
4895 if (!entry->show)
4896 return -EIO;
af8a2434
N		 4897 spin_lock(&all_mddevs_lock);
4898 if (list_empty(&mddev->all_mddevs)) {
4899 spin_unlock(&all_mddevs_lock);
4900 return -EBUSY;
4901 }
4902 mddev_get(mddev);
4903 spin_unlock(&all_mddevs_lock);
4904
b7b17c9b 4905 rv = entry->show(mddev, page);
af8a2434 4906 mddev_put(mddev);
96de1e66 4907 return rv;
eae1701f
N		 4908}
4909
4910static ssize_t
4911md_attr_store(struct kobject *kobj, struct attribute *attr,
4912 const char *page, size_t length)
4913{
4914 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
fd01b88c 4915 struct mddev *mddev = container_of(kobj, struct mddev, kobj);
96de1e66 4916 ssize_t rv;
eae1701f
N		 4917
4918 if (!entry->store)
4919 return -EIO;
67463acb
N		 4920 if (!capable(CAP_SYS_ADMIN))
4921 return -EACCES;
af8a2434
N		 4922 spin_lock(&all_mddevs_lock);
4923 if (list_empty(&mddev->all_mddevs)) {
4924 spin_unlock(&all_mddevs_lock);
4925 return -EBUSY;
4926 }
4927 mddev_get(mddev);
4928 spin_unlock(&all_mddevs_lock);
6791875e 4929 rv = entry->store(mddev, page, length);
af8a2434 4930 mddev_put(mddev);
96de1e66 4931 return rv;
eae1701f
N		 4932}
4933
4934static void md_free(struct kobject *ko)
4935{
fd01b88c 4936 struct mddev *mddev = container_of(ko, struct mddev, kobj);
a21d1504
N		 4937
4938 if (mddev->sysfs_state)
4939 sysfs_put(mddev->sysfs_state);
4940
6cd18e71
N		 4941 if (mddev->queue)
4942 blk_cleanup_queue(mddev->queue);
a21d1504
N		 4943 if (mddev->gendisk) {
4944 del_gendisk(mddev->gendisk);
4945 put_disk(mddev->gendisk);
4946 }
a21d1504 4947
eae1701f
N		 4948 kfree(mddev);
4949}
4950
52cf25d0 4951static const struct sysfs_ops md_sysfs_ops = {
eae1701f
N		 4952 .show = md_attr_show,
4953 .store = md_attr_store,
4954};
4955static struct kobj_type md_ktype = {
4956 .release = md_free,
4957 .sysfs_ops = &md_sysfs_ops,
4958 .default_attrs = md_default_attrs,
4959};
4960
1da177e4
LT		 4961int mdp_major = 0;
4962
5fd3a17e
DW		 4963static void mddev_delayed_delete(struct work_struct *ws)
4964{
fd01b88c 4965 struct mddev *mddev = container_of(ws, struct mddev, del_work);
5fd3a17e 4966
43a70507 4967 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
5fd3a17e
DW		 4968 kobject_del(&mddev->kobj);
4969 kobject_put(&mddev->kobj);
4970}
4971
efeb53c0 4972static int md_alloc(dev_t dev, char *name)
1da177e4 4973{
48c9c27b 4974 static DEFINE_MUTEX(disks_mutex);
fd01b88c 4975 struct mddev *mddev = mddev_find(dev);
1da177e4 4976 struct gendisk *disk;
efeb53c0
N		 4977 int partitioned;
4978 int shift;
4979 int unit;
3830c62f 4980 int error;
1da177e4
LT		 4981
4982 if (!mddev)
efeb53c0
N		 4983 return -ENODEV;
4984
4985 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4986 shift = partitioned ? MdpMinorShift : 0;
4987 unit = MINOR(mddev->unit) >> shift;
1da177e4 4988
e804ac78
TH		 4989 /* wait for any previous instance of this device to be
4990 * completely removed (mddev_delayed_delete).
d3374825 4991 */
e804ac78 4992 flush_workqueue(md_misc_wq);
d3374825 4993
48c9c27b 4994 mutex_lock(&disks_mutex);
0909dc44
N		 4995 error = -EEXIST;
4996 if (mddev->gendisk)
4997 goto abort;
efeb53c0
N		 4998
4999 if (name) {
5000 /* Need to ensure that 'name' is not a duplicate.
5001 */
fd01b88c 5002 struct mddev *mddev2;
efeb53c0
N		 5003 spin_lock(&all_mddevs_lock);
5004
5005 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
5006 if (mddev2->gendisk &&
5007 strcmp(mddev2->gendisk->disk_name, name) == 0) {
5008 spin_unlock(&all_mddevs_lock);
0909dc44 5009 goto abort;
efeb53c0
N		 5010 }
5011 spin_unlock(&all_mddevs_lock);
1da177e4 5012 }
8b765398 5013
0909dc44 5014 error = -ENOMEM;
8b765398 5015 mddev->queue = blk_alloc_queue(GFP_KERNEL);
0909dc44
N		 5016 if (!mddev->queue)
5017 goto abort;
409c57f3
N		 5018 mddev->queue->queuedata = mddev;
5019
409c57f3 5020 blk_queue_make_request(mddev->queue, md_make_request);
b1bd055d 5021 blk_set_stacking_limits(&mddev->queue->limits);
8b765398 5022
1da177e4
LT		 5023 disk = alloc_disk(1 << shift);
5024 if (!disk) {
8b765398
N		 5025 blk_cleanup_queue(mddev->queue);
5026 mddev->queue = NULL;
0909dc44 5027 goto abort;
1da177e4 5028 }
efeb53c0 5029 disk->major = MAJOR(mddev->unit);
1da177e4 5030 disk->first_minor = unit << shift;
efeb53c0
N		 5031 if (name)
5032 strcpy(disk->disk_name, name);
5033 else if (partitioned)
1da177e4 5034 sprintf(disk->disk_name, "md_d%d", unit);
ce7b0f46 5035 else
1da177e4 5036 sprintf(disk->disk_name, "md%d", unit);
1da177e4
LT		 5037 disk->fops = &md_fops;
5038 disk->private_data = mddev;
5039 disk->queue = mddev->queue;
b0140891 5040 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
92850bbd 5041 /* Allow extended partitions. This makes the
d3374825 5042 * 'mdp' device redundant, but we can't really
92850bbd
N		 5043 * remove it now.
5044 */
5045 disk->flags |= GENHD_FL_EXT_DEVT;
1da177e4 5046 mddev->gendisk = disk;
b0140891
N		 5047 /* As soon as we call add_disk(), another thread could get
5048 * through to md_open, so make sure it doesn't get too far
5049 */
5050 mutex_lock(&mddev->open_mutex);
5051 add_disk(disk);
5052
ed9e1982
TH		 5053 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
5054 &disk_to_dev(disk)->kobj, "%s", "md");
0909dc44
N		 5055 if (error) {
5056 /* This isn't possible, but as kobject_init_and_add is marked
5057 * __must_check, we must do something with the result
5058 */
5e55e2f5
N		 5059 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
5060 disk->disk_name);
0909dc44
N		 5061 error = 0;
5062 }
00bcb4ac
N		 5063 if (mddev->kobj.sd &&
5064 sysfs_create_group(&mddev->kobj, &md_bitmap_group))
43a70507 5065 printk(KERN_DEBUG "pointless warning\n");
b0140891 5066 mutex_unlock(&mddev->open_mutex);
0909dc44
N		 5067 abort:
5068 mutex_unlock(&disks_mutex);
00bcb4ac 5069 if (!error && mddev->kobj.sd) {
3830c62f 5070 kobject_uevent(&mddev->kobj, KOBJ_ADD);
00bcb4ac 5071 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
b62b7590 5072 }
d3374825 5073 mddev_put(mddev);
0909dc44 5074 return error;
efeb53c0
N		 5075}
5076
5077static struct kobject *md_probe(dev_t dev, int *part, void *data)
5078{
5079 md_alloc(dev, NULL);
1da177e4
LT		 5080 return NULL;
5081}
5082
efeb53c0
N		 5083static int add_named_array(const char *val, struct kernel_param *kp)
5084{
5085 /* val must be "md_*" where * is not all digits.
5086 * We allocate an array with a large free minor number, and
5087 * set the name to val. val must not already be an active name.
5088 */
5089 int len = strlen(val);
5090 char buf[DISK_NAME_LEN];
5091
5092 while (len && val[len-1] == '\n')
5093 len--;
5094 if (len >= DISK_NAME_LEN)
5095 return -E2BIG;
5096 strlcpy(buf, val, len+1);
5097 if (strncmp(buf, "md_", 3) != 0)
5098 return -EINVAL;
5099 return md_alloc(0, buf);
5100}
5101
1da177e4
LT		 5102static void md_safemode_timeout(unsigned long data)
5103{
fd01b88c 5104 struct mddev *mddev = (struct mddev *) data;
1da177e4 5105
0fd62b86
NB		 5106 if (!atomic_read(&mddev->writes_pending)) {
5107 mddev->safemode = 1;
5108 if (mddev->external)
00bcb4ac 5109 sysfs_notify_dirent_safe(mddev->sysfs_state);
0fd62b86 5110 }
1da177e4
LT		 5111 md_wakeup_thread(mddev->thread);
5112}
5113
6ff8d8ec 5114static int start_dirty_degraded;
1da177e4 5115
fd01b88c 5116int md_run(struct mddev *mddev)
1da177e4 5117{
2604b703 5118 int err;
3cb03002 5119 struct md_rdev *rdev;
84fc4b56 5120 struct md_personality *pers;
1da177e4 5121
a757e64c
N		 5122 if (list_empty(&mddev->disks))
5123 /* cannot run an array with no devices.. */
1da177e4 5124 return -EINVAL;
1da177e4
LT		 5125
5126 if (mddev->pers)
5127 return -EBUSY;
bb4f1e9d
N		 5128 /* Cannot run until previous stop completes properly */
5129 if (mddev->sysfs_active)
5130 return -EBUSY;
b6eb127d 5131
1da177e4
LT		 5132 /*
5133 * Analyze all RAID superblock(s)
5134 */
1ec4a939
N		 5135 if (!mddev->raid_disks) {
5136 if (!mddev->persistent)
5137 return -EINVAL;
a757e64c 5138 analyze_sbs(mddev);
1ec4a939 5139 }
1da177e4 5140
d9d166c2
N		 5141 if (mddev->level != LEVEL_NONE)
5142 request_module("md-level-%d", mddev->level);
5143 else if (mddev->clevel[0])
5144 request_module("md-%s", mddev->clevel);
1da177e4
LT		 5145
5146 /*
5147 * Drop all container device buffers, from now on
5148 * the only valid external interface is through the md
5149 * device.
1da177e4 5150 */
dafb20fa 5151 rdev_for_each(rdev, mddev) {
b2d444d7 5152 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 5153 continue;
5154 sync_blockdev(rdev->bdev);
f98393a6 5155 invalidate_bdev(rdev->bdev);
f0d76d70
N		 5156
5157 /* perform some consistency tests on the device.
5158 * We don't want the data to overlap the metadata,
58c0fed4 5159 * Internal Bitmap issues have been handled elsewhere.
f0d76d70 5160 */
a6ff7e08
JB		 5161 if (rdev->meta_bdev) {
5162 /* Nothing to check */;
5163 } else if (rdev->data_offset < rdev->sb_start) {
58c0fed4
AN		 5164 if (mddev->dev_sectors &&
5165 rdev->data_offset + mddev->dev_sectors
0f420358 5166 > rdev->sb_start) {
f0d76d70
N		 5167 printk("md: %s: data overlaps metadata\n",
5168 mdname(mddev));
5169 return -EINVAL;
5170 }
5171 } else {
0f420358 5172 if (rdev->sb_start + rdev->sb_size/512
f0d76d70
N		 5173 > rdev->data_offset) {
5174 printk("md: %s: metadata overlaps data\n",
5175 mdname(mddev));
5176 return -EINVAL;
5177 }
5178 }
00bcb4ac 5179 sysfs_notify_dirent_safe(rdev->sysfs_state);
1da177e4
LT		 5180 }
5181
a167f663 5182 if (mddev->bio_set == NULL)
395c72a7 5183 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
a167f663 5184
1da177e4 5185 spin_lock(&pers_lock);
d9d166c2 5186 pers = find_pers(mddev->level, mddev->clevel);
2604b703 5187 if (!pers || !try_module_get(pers->owner)) {
1da177e4 5188 spin_unlock(&pers_lock);
d9d166c2
N		 5189 if (mddev->level != LEVEL_NONE)
5190 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
5191 mddev->level);
5192 else
5193 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
5194 mddev->clevel);
1da177e4
LT		 5195 return -EINVAL;
5196 }
1da177e4 5197 spin_unlock(&pers_lock);
34817e8c
N		 5198 if (mddev->level != pers->level) {
5199 mddev->level = pers->level;
5200 mddev->new_level = pers->level;
5201 }
d9d166c2 5202 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
1da177e4 5203
f6705578 5204 if (mddev->reshape_position != MaxSector &&
63c70c4f 5205 pers->start_reshape == NULL) {
f6705578 5206 /* This personality cannot handle reshaping... */
f6705578
N		 5207 module_put(pers->owner);
5208 return -EINVAL;
5209 }
5210
7dd5e7c3
N		 5211 if (pers->sync_request) {
5212 /* Warn if this is a potentially silly
5213 * configuration.
5214 */
5215 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3cb03002 5216 struct md_rdev *rdev2;
7dd5e7c3 5217 int warned = 0;
159ec1fc 5218
dafb20fa
N		 5219 rdev_for_each(rdev, mddev)
5220 rdev_for_each(rdev2, mddev) {
7dd5e7c3
N		 5221 if (rdev < rdev2 &&
5222 rdev->bdev->bd_contains ==
5223 rdev2->bdev->bd_contains) {
5224 printk(KERN_WARNING
5225 "%s: WARNING: %s appears to be"
5226 " on the same physical disk as"
5227 " %s.\n",
5228 mdname(mddev),
5229 bdevname(rdev->bdev,b),
5230 bdevname(rdev2->bdev,b2));
5231 warned = 1;
5232 }
5233 }
159ec1fc 5234
7dd5e7c3
N		 5235 if (warned)
5236 printk(KERN_WARNING
5237 "True protection against single-disk"
5238 " failure might be compromised.\n");
5239 }
5240
657390d2 5241 mddev->recovery = 0;
58c0fed4
AN		 5242 /* may be over-ridden by personality */
5243 mddev->resync_max_sectors = mddev->dev_sectors;
5244
6ff8d8ec 5245 mddev->ok_start_degraded = start_dirty_degraded;
1da177e4 5246
0f9552b5 5247 if (start_readonly && mddev->ro == 0)
f91de92e
N		 5248 mddev->ro = 2; /* read-only, but switch on first write */
5249
36d091f4 5250 err = pers->run(mddev);
13e53df3
AN		 5251 if (err)
5252 printk(KERN_ERR "md: pers->run() failed ...\n");
36d091f4 5253 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
b522adcd
DW		 5254 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
5255 " but 'external_size' not in effect?\n", __func__);
5256 printk(KERN_ERR
5257 "md: invalid array_size %llu > default size %llu\n",
5258 (unsigned long long)mddev->array_sectors / 2,
36d091f4 5259 (unsigned long long)pers->size(mddev, 0, 0) / 2);
b522adcd 5260 err = -EINVAL;
b522adcd 5261 }
36d091f4 5262 if (err == 0 && pers->sync_request &&
ef99bf48 5263 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
f9209a32
GR		 5264 struct bitmap *bitmap;
5265
5266 bitmap = bitmap_create(mddev, -1);
5267 if (IS_ERR(bitmap)) {
5268 err = PTR_ERR(bitmap);
b15c2e57
N		 5269 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
5270 mdname(mddev), err);
f9209a32
GR		 5271 } else
5272 mddev->bitmap = bitmap;
5273
b15c2e57 5274 }
1da177e4 5275 if (err) {
5aa61f42 5276 mddev_detach(mddev);
0c35bd47
N		 5277 if (mddev->private)
5278 pers->free(mddev, mddev->private);
bd691922 5279 mddev->private = NULL;
36d091f4 5280 module_put(pers->owner);
32a7627c
N		 5281 bitmap_destroy(mddev);
5282 return err;
1da177e4 5283 }
5c675f83
N		 5284 if (mddev->queue) {
5285 mddev->queue->backing_dev_info.congested_data = mddev;
5286 mddev->queue->backing_dev_info.congested_fn = md_congested;
5287 }
36d091f4 5288 if (pers->sync_request) {
00bcb4ac
N		 5289 if (mddev->kobj.sd &&
5290 sysfs_create_group(&mddev->kobj, &md_redundancy_group))
5e55e2f5
N		 5291 printk(KERN_WARNING
5292 "md: cannot register extra attributes for %s\n",
5293 mdname(mddev));
00bcb4ac 5294 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
5e55e2f5 5295 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
fd9d49ca
N		 5296 mddev->ro = 0;
5297
f72ffdd6 5298 atomic_set(&mddev->writes_pending,0);
1e50915f
RB		 5299 atomic_set(&mddev->max_corr_read_errors,
5300 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
1da177e4 5301 mddev->safemode = 0;
28c1b9fd
GR		 5302 if (mddev_is_clustered(mddev))
5303 mddev->safemode_delay = 0;
5304 else
5305 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
1da177e4 5306 mddev->in_sync = 1;
0ca69886 5307 smp_wmb();
36d091f4
N		 5308 spin_lock(&mddev->lock);
5309 mddev->pers = pers;
36d091f4 5310 spin_unlock(&mddev->lock);
dafb20fa 5311 rdev_for_each(rdev, mddev)
36fad858
NK		 5312 if (rdev->raid_disk >= 0)
5313 if (sysfs_link_rdev(mddev, rdev))
00bcb4ac 5314 /* failure here is OK */;
f72ffdd6 5315
a4a3d26d
N		 5316 if (mddev->degraded && !mddev->ro)
5317 /* This ensures that recovering status is reported immediately
5318 * via sysfs - until a lack of spares is confirmed.
5319 */
5320 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
1da177e4 5321 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
f72ffdd6 5322
7a0a5355 5323 if (mddev->flags & MD_UPDATE_SB_FLAGS)
850b2b42 5324 md_update_sb(mddev, 0);
1da177e4 5325
d7603b7e 5326 md_new_event(mddev);
00bcb4ac
N		 5327 sysfs_notify_dirent_safe(mddev->sysfs_state);
5328 sysfs_notify_dirent_safe(mddev->sysfs_action);
a99ac971 5329 sysfs_notify(&mddev->kobj, NULL, "degraded");
1da177e4
LT		 5330 return 0;
5331}
390ee602 5332EXPORT_SYMBOL_GPL(md_run);
1da177e4 5333
fd01b88c 5334static int do_md_run(struct mddev *mddev)
fe60b014
N		 5335{
5336 int err;
5337
5338 err = md_run(mddev);
5339 if (err)
5340 goto out;
69e51b44
N		 5341 err = bitmap_load(mddev);
5342 if (err) {
5343 bitmap_destroy(mddev);
5344 goto out;
5345 }
0fd018af 5346
28c1b9fd
GR		 5347 if (mddev_is_clustered(mddev))
5348 md_allow_write(mddev);
5349
0fd018af
JB		 5350 md_wakeup_thread(mddev->thread);
5351 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
5352
fe60b014
N		 5353 set_capacity(mddev->gendisk, mddev->array_sectors);
5354 revalidate_disk(mddev->gendisk);
f0b4f7e2 5355 mddev->changed = 1;
fe60b014
N		 5356 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
5357out:
5358 return err;
5359}
5360
fd01b88c 5361static int restart_array(struct mddev *mddev)
1da177e4
LT		 5362{
5363 struct gendisk *disk = mddev->gendisk;
1da177e4 5364
80fab1d7 5365 /* Complain if it has no devices */
1da177e4 5366 if (list_empty(&mddev->disks))
80fab1d7
AN		 5367 return -ENXIO;
5368 if (!mddev->pers)
5369 return -EINVAL;
5370 if (!mddev->ro)
5371 return -EBUSY;
339421de
SL		 5372 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
5373 struct md_rdev *rdev;
5374 bool has_journal = false;
5375
5376 rcu_read_lock();
5377 rdev_for_each_rcu(rdev, mddev) {
5378 if (test_bit(Journal, &rdev->flags) &&
5379 !test_bit(Faulty, &rdev->flags)) {
5380 has_journal = true;
5381 break;
5382 }
5383 }
5384 rcu_read_unlock();
5385
5386 /* Don't restart rw with journal missing/faulty */
5387 if (!has_journal)
5388 return -EINVAL;
5389 }
5390
80fab1d7
AN		 5391 mddev->safemode = 0;
5392 mddev->ro = 0;
5393 set_disk_ro(disk, 0);
5394 printk(KERN_INFO "md: %s switched to read-write mode.\n",
5395 mdname(mddev));
5396 /* Kick recovery or resync if necessary */
5397 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5398 md_wakeup_thread(mddev->thread);
5399 md_wakeup_thread(mddev->sync_thread);
00bcb4ac 5400 sysfs_notify_dirent_safe(mddev->sysfs_state);
80fab1d7 5401 return 0;
1da177e4
LT		 5402}
5403
fd01b88c 5404static void md_clean(struct mddev *mddev)
6177b472
N		 5405{
5406 mddev->array_sectors = 0;
5407 mddev->external_size = 0;
5408 mddev->dev_sectors = 0;
5409 mddev->raid_disks = 0;
5410 mddev->recovery_cp = 0;
5411 mddev->resync_min = 0;
5412 mddev->resync_max = MaxSector;
5413 mddev->reshape_position = MaxSector;
5414 mddev->external = 0;
5415 mddev->persistent = 0;
5416 mddev->level = LEVEL_NONE;
5417 mddev->clevel[0] = 0;
5418 mddev->flags = 0;
5419 mddev->ro = 0;
5420 mddev->metadata_type[0] = 0;
5421 mddev->chunk_sectors = 0;
5422 mddev->ctime = mddev->utime = 0;
5423 mddev->layout = 0;
5424 mddev->max_disks = 0;
5425 mddev->events = 0;
a8707c08 5426 mddev->can_decrease_events = 0;
6177b472 5427 mddev->delta_disks = 0;
2c810cdd 5428 mddev->reshape_backwards = 0;
6177b472
N		 5429 mddev->new_level = LEVEL_NONE;
5430 mddev->new_layout = 0;
5431 mddev->new_chunk_sectors = 0;
5432 mddev->curr_resync = 0;
7f7583d4 5433 atomic64_set(&mddev->resync_mismatches, 0);
6177b472
N		 5434 mddev->suspend_lo = mddev->suspend_hi = 0;
5435 mddev->sync_speed_min = mddev->sync_speed_max = 0;
5436 mddev->recovery = 0;
5437 mddev->in_sync = 0;
f0b4f7e2 5438 mddev->changed = 0;
6177b472 5439 mddev->degraded = 0;
6177b472 5440 mddev->safemode = 0;
bd691922 5441 mddev->private = NULL;
6177b472
N		 5442 mddev->bitmap_info.offset = 0;
5443 mddev->bitmap_info.default_offset = 0;
6409bb05 5444 mddev->bitmap_info.default_space = 0;
6177b472
N		 5445 mddev->bitmap_info.chunksize = 0;
5446 mddev->bitmap_info.daemon_sleep = 0;
5447 mddev->bitmap_info.max_write_behind = 0;
5448}
5449
fd01b88c 5450static void __md_stop_writes(struct mddev *mddev)
a047e125 5451{
6b6204ee 5452 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
f851b60d 5453 flush_workqueue(md_misc_wq);
a047e125 5454 if (mddev->sync_thread) {
a047e125 5455 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
a91d5ac0 5456 md_reap_sync_thread(mddev);
a047e125
N		 5457 }
5458
5459 del_timer_sync(&mddev->safemode_timer);
5460
5461 bitmap_flush(mddev);
5462 md_super_wait(mddev);
5463
b6d428c6 5464 if (mddev->ro == 0 &&
28c1b9fd
GR		 5465 ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
5466 (mddev->flags & MD_UPDATE_SB_FLAGS))) {
a047e125 5467 /* mark array as shutdown cleanly */
28c1b9fd
GR		 5468 if (!mddev_is_clustered(mddev))
5469 mddev->in_sync = 1;
a047e125
N		 5470 md_update_sb(mddev, 1);
5471 }
5472}
defad61a 5473
fd01b88c 5474void md_stop_writes(struct mddev *mddev)
defad61a 5475{
29f097c4 5476 mddev_lock_nointr(mddev);
defad61a
N		 5477 __md_stop_writes(mddev);
5478 mddev_unlock(mddev);
5479}
390ee602 5480EXPORT_SYMBOL_GPL(md_stop_writes);
a047e125 5481
5aa61f42
N		 5482static void mddev_detach(struct mddev *mddev)
5483{
5484 struct bitmap *bitmap = mddev->bitmap;
5485 /* wait for behind writes to complete */
5486 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
5487 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n",
5488 mdname(mddev));
5489 /* need to kick something here to make sure I/O goes? */
5490 wait_event(bitmap->behind_wait,
5491 atomic_read(&bitmap->behind_writes) == 0);
5492 }
36d091f4 5493 if (mddev->pers && mddev->pers->quiesce) {
5aa61f42
N		 5494 mddev->pers->quiesce(mddev, 1);
5495 mddev->pers->quiesce(mddev, 0);
5496 }
5497 md_unregister_thread(&mddev->thread);
5498 if (mddev->queue)
5499 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
5500}
5501
5eff3c43 5502static void __md_stop(struct mddev *mddev)
6177b472 5503{
36d091f4 5504 struct md_personality *pers = mddev->pers;
5aa61f42 5505 mddev_detach(mddev);
ee5d004f
N		 5506 /* Ensure ->event_work is done */
5507 flush_workqueue(md_misc_wq);
36d091f4 5508 spin_lock(&mddev->lock);
6177b472 5509 mddev->pers = NULL;
36d091f4
N		 5510 spin_unlock(&mddev->lock);
5511 pers->free(mddev, mddev->private);
bd691922 5512 mddev->private = NULL;
36d091f4
N		 5513 if (pers->sync_request && mddev->to_remove == NULL)
5514 mddev->to_remove = &md_redundancy_group;
5515 module_put(pers->owner);
cca9cf90 5516 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
6177b472 5517}
5eff3c43
N		 5518
5519void md_stop(struct mddev *mddev)
5520{
5521 /* stop the array and free an attached data structures.
5522 * This is called from dm-raid
5523 */
5524 __md_stop(mddev);
5525 bitmap_destroy(mddev);
5526 if (mddev->bio_set)
5527 bioset_free(mddev->bio_set);
5528}
5529
390ee602 5530EXPORT_SYMBOL_GPL(md_stop);
6177b472 5531
a05b7ea0 5532static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
a4bd82d0
N		 5533{
5534 int err = 0;
30b8feb7
N		 5535 int did_freeze = 0;
5536
5537 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5538 did_freeze = 1;
5539 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5540 md_wakeup_thread(mddev->thread);
5541 }
f851b60d 5542 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
30b8feb7 5543 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
f851b60d 5544 if (mddev->sync_thread)
30b8feb7
N		 5545 /* Thread might be blocked waiting for metadata update
5546 * which will now never happen */
5547 wake_up_process(mddev->sync_thread->tsk);
f851b60d 5548
88724bfa
N		 5549 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
5550 return -EBUSY;
30b8feb7 5551 mddev_unlock(mddev);
f851b60d
N		 5552 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
5553 &mddev->recovery));
88724bfa
N		 5554 wait_event(mddev->sb_wait,
5555 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
30b8feb7
N		 5556 mddev_lock_nointr(mddev);
5557
a4bd82d0 5558 mutex_lock(&mddev->open_mutex);
9ba3b7f5 5559 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
30b8feb7 5560 mddev->sync_thread ||
f851b60d 5561 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
30b8feb7 5562 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
a4bd82d0 5563 printk("md: %s still in use.\n",mdname(mddev));
30b8feb7
N		 5564 if (did_freeze) {
5565 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
45eaf45d 5566 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
30b8feb7
N		 5567 md_wakeup_thread(mddev->thread);
5568 }
a4bd82d0
N		 5569 err = -EBUSY;
5570 goto out;
5571 }
5572 if (mddev->pers) {
defad61a 5573 __md_stop_writes(mddev);
a4bd82d0
N		 5574
5575 err = -ENXIO;
5576 if (mddev->ro==1)
5577 goto out;
5578 mddev->ro = 1;
5579 set_disk_ro(mddev->gendisk, 1);
5580 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
45eaf45d
N		 5581 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5582 md_wakeup_thread(mddev->thread);
00bcb4ac 5583 sysfs_notify_dirent_safe(mddev->sysfs_state);
30b8feb7 5584 err = 0;
a4bd82d0
N		 5585 }
5586out:
5587 mutex_unlock(&mddev->open_mutex);
5588 return err;
5589}
5590
9e653b63
N		 5591/* mode:
5592 * 0 - completely stop and dis-assemble array
9e653b63
N		 5593 * 2 - stop but do not disassemble array
5594 */
f72ffdd6 5595static int do_md_stop(struct mddev *mddev, int mode,
a05b7ea0 5596 struct block_device *bdev)
1da177e4 5597{
1da177e4 5598 struct gendisk *disk = mddev->gendisk;
3cb03002 5599 struct md_rdev *rdev;
30b8feb7
N		 5600 int did_freeze = 0;
5601
5602 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
5603 did_freeze = 1;
5604 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
5605 md_wakeup_thread(mddev->thread);
5606 }
f851b60d 5607 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
30b8feb7 5608 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
f851b60d 5609 if (mddev->sync_thread)
30b8feb7
N		 5610 /* Thread might be blocked waiting for metadata update
5611 * which will now never happen */
5612 wake_up_process(mddev->sync_thread->tsk);
f851b60d 5613
30b8feb7 5614 mddev_unlock(mddev);
f851b60d
N		 5615 wait_event(resync_wait, (mddev->sync_thread == NULL &&
5616 !test_bit(MD_RECOVERY_RUNNING,
5617 &mddev->recovery)));
30b8feb7 5618 mddev_lock_nointr(mddev);
1da177e4 5619
c8c00a69 5620 mutex_lock(&mddev->open_mutex);
9ba3b7f5 5621 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
30b8feb7
N		 5622 mddev->sysfs_active ||
5623 mddev->sync_thread ||
f851b60d 5624 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
30b8feb7 5625 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
df5b20cf 5626 printk("md: %s still in use.\n",mdname(mddev));
6e17b027 5627 mutex_unlock(&mddev->open_mutex);
30b8feb7
N		 5628 if (did_freeze) {
5629 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
45eaf45d 5630 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
30b8feb7
N		 5631 md_wakeup_thread(mddev->thread);
5632 }
260fa034
N		 5633 return -EBUSY;
5634 }
6e17b027 5635 if (mddev->pers) {
a4bd82d0
N		 5636 if (mddev->ro)
5637 set_disk_ro(disk, 0);
409c57f3 5638
defad61a 5639 __md_stop_writes(mddev);
5eff3c43 5640 __md_stop(mddev);
a4bd82d0 5641 mddev->queue->backing_dev_info.congested_fn = NULL;
6177b472 5642
a4bd82d0 5643 /* tell userspace to handle 'inactive' */
00bcb4ac 5644 sysfs_notify_dirent_safe(mddev->sysfs_state);
0d4ca600 5645
dafb20fa 5646 rdev_for_each(rdev, mddev)
36fad858
NK		 5647 if (rdev->raid_disk >= 0)
5648 sysfs_unlink_rdev(mddev, rdev);
c4647292 5649
a4bd82d0 5650 set_capacity(disk, 0);
6e17b027 5651 mutex_unlock(&mddev->open_mutex);
f0b4f7e2 5652 mddev->changed = 1;
a4bd82d0 5653 revalidate_disk(disk);
0d4ca600 5654
a4bd82d0
N		 5655 if (mddev->ro)
5656 mddev->ro = 0;
6e17b027
N		 5657 } else
5658 mutex_unlock(&mddev->open_mutex);
1da177e4
LT		 5659 /*
5660 * Free resources if final stop
5661 */
9e653b63 5662 if (mode == 0) {
1da177e4
LT		 5663 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
5664
978f946b 5665 bitmap_destroy(mddev);
c3d9714e 5666 if (mddev->bitmap_info.file) {
4af1a041
N		 5667 struct file *f = mddev->bitmap_info.file;
5668 spin_lock(&mddev->lock);
c3d9714e 5669 mddev->bitmap_info.file = NULL;
4af1a041
N		 5670 spin_unlock(&mddev->lock);
5671 fput(f);
978f946b 5672 }
c3d9714e 5673 mddev->bitmap_info.offset = 0;
978f946b 5674
1da177e4
LT		 5675 export_array(mddev);
5676
6177b472 5677 md_clean(mddev);
efeb53c0
N		 5678 if (mddev->hold_active == UNTIL_STOP)
5679 mddev->hold_active = 0;
a4bd82d0 5680 }
d7603b7e 5681 md_new_event(mddev);
00bcb4ac 5682 sysfs_notify_dirent_safe(mddev->sysfs_state);
6e17b027 5683 return 0;
1da177e4
LT		 5684}
5685
fdee8ae4 5686#ifndef MODULE
fd01b88c 5687static void autorun_array(struct mddev *mddev)
1da177e4 5688{
3cb03002 5689 struct md_rdev *rdev;
1da177e4
LT		 5690 int err;
5691
a757e64c 5692 if (list_empty(&mddev->disks))
1da177e4 5693 return;
1da177e4
LT		 5694
5695 printk(KERN_INFO "md: running: ");
5696
dafb20fa 5697 rdev_for_each(rdev, mddev) {
1da177e4
LT		 5698 char b[BDEVNAME_SIZE];
5699 printk("<%s>", bdevname(rdev->bdev,b));
5700 }
5701 printk("\n");
5702
d710e138 5703 err = do_md_run(mddev);
1da177e4
LT		 5704 if (err) {
5705 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
a05b7ea0 5706 do_md_stop(mddev, 0, NULL);
1da177e4
LT		 5707 }
5708}
5709
5710/*
5711 * lets try to run arrays based on all disks that have arrived
5712 * until now. (those are in pending_raid_disks)
5713 *
5714 * the method: pick the first pending disk, collect all disks with
5715 * the same UUID, remove all from the pending list and put them into
5716 * the 'same_array' list. Then order this list based on superblock
5717 * update time (freshest comes first), kick out 'old' disks and
5718 * compare superblocks. If everything's fine then run it.
5719 *
5720 * If "unit" is allocated, then bump its reference count
5721 */
5722static void autorun_devices(int part)
5723{
3cb03002 5724 struct md_rdev *rdev0, *rdev, *tmp;
fd01b88c 5725 struct mddev *mddev;
1da177e4
LT		 5726 char b[BDEVNAME_SIZE];
5727
5728 printk(KERN_INFO "md: autorun ...\n");
5729 while (!list_empty(&pending_raid_disks)) {
e8703fe1 5730 int unit;
1da177e4 5731 dev_t dev;
ad01c9e3 5732 LIST_HEAD(candidates);
1da177e4 5733 rdev0 = list_entry(pending_raid_disks.next,
3cb03002 5734 struct md_rdev, same_set);
1da177e4
LT		 5735
5736 printk(KERN_INFO "md: considering %s ...\n",
5737 bdevname(rdev0->bdev,b));
5738 INIT_LIST_HEAD(&candidates);
159ec1fc 5739 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
1da177e4
LT		 5740 if (super_90_load(rdev, rdev0, 0) >= 0) {
5741 printk(KERN_INFO "md: adding %s ...\n",
5742 bdevname(rdev->bdev,b));
5743 list_move(&rdev->same_set, &candidates);
5744 }
5745 /*
5746 * now we have a set of devices, with all of them having
5747 * mostly sane superblocks. It's time to allocate the
5748 * mddev.
5749 */
e8703fe1
N		 5750 if (part) {
5751 dev = MKDEV(mdp_major,
5752 rdev0->preferred_minor << MdpMinorShift);
5753 unit = MINOR(dev) >> MdpMinorShift;
5754 } else {
5755 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
5756 unit = MINOR(dev);
5757 }
5758 if (rdev0->preferred_minor != unit) {
1da177e4
LT		 5759 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
5760 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
5761 break;
5762 }
1da177e4
LT		 5763
5764 md_probe(dev, NULL, NULL);
5765 mddev = mddev_find(dev);
9bbbca3a
NB		 5766 if (!mddev || !mddev->gendisk) {
5767 if (mddev)
5768 mddev_put(mddev);
5769 printk(KERN_ERR
1da177e4
LT		 5770 "md: cannot allocate memory for md drive.\n");
5771 break;
5772 }
f72ffdd6 5773 if (mddev_lock(mddev))
1da177e4
LT		 5774 printk(KERN_WARNING "md: %s locked, cannot run\n",
5775 mdname(mddev));
5776 else if (mddev->raid_disks || mddev->major_version
5777 || !list_empty(&mddev->disks)) {
f72ffdd6 5778 printk(KERN_WARNING
1da177e4
LT		 5779 "md: %s already running, cannot run %s\n",
5780 mdname(mddev), bdevname(rdev0->bdev,b));
5781 mddev_unlock(mddev);
5782 } else {
5783 printk(KERN_INFO "md: created %s\n", mdname(mddev));
1ec4a939 5784 mddev->persistent = 1;
159ec1fc 5785 rdev_for_each_list(rdev, tmp, &candidates) {
1da177e4
LT		 5786 list_del_init(&rdev->same_set);
5787 if (bind_rdev_to_array(rdev, mddev))
5788 export_rdev(rdev);
5789 }
5790 autorun_array(mddev);
5791 mddev_unlock(mddev);
5792 }
5793 /* on success, candidates will be empty, on error
5794 * it won't...
5795 */
159ec1fc 5796 rdev_for_each_list(rdev, tmp, &candidates) {
4b80991c 5797 list_del_init(&rdev->same_set);
1da177e4 5798 export_rdev(rdev);
4b80991c 5799 }
1da177e4
LT		 5800 mddev_put(mddev);
5801 }
5802 printk(KERN_INFO "md: ... autorun DONE.\n");
5803}
fdee8ae4 5804#endif /* !MODULE */
1da177e4 5805
f72ffdd6 5806static int get_version(void __user *arg)
1da177e4
LT		 5807{
5808 mdu_version_t ver;
5809
5810 ver.major = MD_MAJOR_VERSION;
5811 ver.minor = MD_MINOR_VERSION;
5812 ver.patchlevel = MD_PATCHLEVEL_VERSION;
5813
5814 if (copy_to_user(arg, &ver, sizeof(ver)))
5815 return -EFAULT;
5816
5817 return 0;
5818}
5819
f72ffdd6 5820static int get_array_info(struct mddev *mddev, void __user *arg)
1da177e4
LT		 5821{
5822 mdu_array_info_t info;
a9f326eb 5823 int nr,working,insync,failed,spare;
3cb03002 5824 struct md_rdev *rdev;
1da177e4 5825
1ca69c4b
N		 5826 nr = working = insync = failed = spare = 0;
5827 rcu_read_lock();
5828 rdev_for_each_rcu(rdev, mddev) {
1da177e4 5829 nr++;
b2d444d7 5830 if (test_bit(Faulty, &rdev->flags))
1da177e4
LT		 5831 failed++;
5832 else {
5833 working++;
b2d444d7 5834 if (test_bit(In_sync, &rdev->flags))
f72ffdd6 5835 insync++;
1da177e4
LT		 5836 else
5837 spare++;
5838 }
5839 }
1ca69c4b 5840 rcu_read_unlock();
1da177e4
LT		 5841
5842 info.major_version = mddev->major_version;
5843 info.minor_version = mddev->minor_version;
5844 info.patch_version = MD_PATCHLEVEL_VERSION;
9ebc6ef1 5845 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
1da177e4 5846 info.level = mddev->level;
58c0fed4
AN		 5847 info.size = mddev->dev_sectors / 2;
5848 if (info.size != mddev->dev_sectors / 2) /* overflow */
284ae7ca 5849 info.size = -1;
1da177e4
LT		 5850 info.nr_disks = nr;
5851 info.raid_disks = mddev->raid_disks;
5852 info.md_minor = mddev->md_minor;
5853 info.not_persistent= !mddev->persistent;
5854
9ebc6ef1 5855 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
1da177e4
LT		 5856 info.state = 0;
5857 if (mddev->in_sync)
5858 info.state = (1<<MD_SB_CLEAN);
c3d9714e 5859 if (mddev->bitmap && mddev->bitmap_info.offset)
9bd35920 5860 info.state |= (1<<MD_SB_BITMAP_PRESENT);
ca8895d9
GR		 5861 if (mddev_is_clustered(mddev))
5862 info.state |= (1<<MD_SB_CLUSTERED);
a9f326eb 5863 info.active_disks = insync;
1da177e4
LT		 5864 info.working_disks = working;
5865 info.failed_disks = failed;
5866 info.spare_disks = spare;
5867
5868 info.layout = mddev->layout;
9d8f0363 5869 info.chunk_size = mddev->chunk_sectors << 9;
1da177e4
LT		 5870
5871 if (copy_to_user(arg, &info, sizeof(info)))
5872 return -EFAULT;
5873
5874 return 0;
5875}
5876
f72ffdd6 5877static int get_bitmap_file(struct mddev *mddev, void __user * arg)
32a7627c
N		 5878{
5879 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
f4ad3d38 5880 char *ptr;
4af1a041 5881 int err;
32a7627c 5882
b6878d9e 5883 file = kzalloc(sizeof(*file), GFP_NOIO);
32a7627c 5884 if (!file)
4af1a041 5885 return -ENOMEM;
32a7627c 5886
4af1a041
N		 5887 err = 0;
5888 spin_lock(&mddev->lock);
25eafe1a
BR		 5889 /* bitmap enabled */
5890 if (mddev->bitmap_info.file) {
5891 ptr = file_path(mddev->bitmap_info.file, file->pathname,
5892 sizeof(file->pathname));
5893 if (IS_ERR(ptr))
5894 err = PTR_ERR(ptr);
5895 else
5896 memmove(file->pathname, ptr,
5897 sizeof(file->pathname)-(ptr-file->pathname));
5898 }
4af1a041 5899 spin_unlock(&mddev->lock);
32a7627c 5900
4af1a041
N		 5901 if (err == 0 &&
5902 copy_to_user(arg, file, sizeof(*file)))
32a7627c 5903 err = -EFAULT;
4af1a041 5904
32a7627c
N		 5905 kfree(file);
5906 return err;
5907}
5908
f72ffdd6 5909static int get_disk_info(struct mddev *mddev, void __user * arg)
1da177e4
LT		 5910{
5911 mdu_disk_info_t info;
3cb03002 5912 struct md_rdev *rdev;
1da177e4
LT		 5913
5914 if (copy_from_user(&info, arg, sizeof(info)))
5915 return -EFAULT;
5916
1ca69c4b 5917 rcu_read_lock();
57d051dc 5918 rdev = md_find_rdev_nr_rcu(mddev, info.number);
1da177e4
LT		 5919 if (rdev) {
5920 info.major = MAJOR(rdev->bdev->bd_dev);
5921 info.minor = MINOR(rdev->bdev->bd_dev);
5922 info.raid_disk = rdev->raid_disk;
5923 info.state = 0;
b2d444d7 5924 if (test_bit(Faulty, &rdev->flags))
1da177e4 5925 info.state |= (1<<MD_DISK_FAULTY);
b2d444d7 5926 else if (test_bit(In_sync, &rdev->flags)) {
1da177e4
LT		 5927 info.state |= (1<<MD_DISK_ACTIVE);
5928 info.state |= (1<<MD_DISK_SYNC);
5929 }
9efdca16 5930 if (test_bit(Journal, &rdev->flags))
bac624f3 5931 info.state |= (1<<MD_DISK_JOURNAL);
8ddf9efe
N		 5932 if (test_bit(WriteMostly, &rdev->flags))
5933 info.state |= (1<<MD_DISK_WRITEMOSTLY);
1da177e4
LT		 5934 } else {
5935 info.major = info.minor = 0;
5936 info.raid_disk = -1;
5937 info.state = (1<<MD_DISK_REMOVED);
5938 }
1ca69c4b 5939 rcu_read_unlock();
1da177e4
LT		 5940
5941 if (copy_to_user(arg, &info, sizeof(info)))
5942 return -EFAULT;
5943
5944 return 0;
5945}
5946
f72ffdd6 5947static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
1da177e4
LT		 5948{
5949 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3cb03002 5950 struct md_rdev *rdev;
1da177e4
LT		 5951 dev_t dev = MKDEV(info->major,info->minor);
5952
1aee41f6
GR		 5953 if (mddev_is_clustered(mddev) &&
5954 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) {
fa8259da 5955 pr_err("%s: Cannot add to clustered mddev.\n",
1aee41f6
GR		 5956 mdname(mddev));
5957 return -EINVAL;
5958 }
5959
1da177e4
LT		 5960 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5961 return -EOVERFLOW;
5962
5963 if (!mddev->raid_disks) {
5964 int err;
5965 /* expecting a device which has a superblock */
5966 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5967 if (IS_ERR(rdev)) {
f72ffdd6 5968 printk(KERN_WARNING
1da177e4
LT		 5969 "md: md_import_device returned %ld\n",
5970 PTR_ERR(rdev));
5971 return PTR_ERR(rdev);
5972 }
5973 if (!list_empty(&mddev->disks)) {
3cb03002
N		 5974 struct md_rdev *rdev0
5975 = list_entry(mddev->disks.next,
5976 struct md_rdev, same_set);
a9f326eb 5977 err = super_types[mddev->major_version]
1da177e4
LT		 5978 .load_super(rdev, rdev0, mddev->minor_version);
5979 if (err < 0) {
f72ffdd6 5980 printk(KERN_WARNING
1da177e4 5981 "md: %s has different UUID to %s\n",
f72ffdd6 5982 bdevname(rdev->bdev,b),
1da177e4
LT		 5983 bdevname(rdev0->bdev,b2));
5984 export_rdev(rdev);
5985 return -EINVAL;
5986 }
5987 }
5988 err = bind_rdev_to_array(rdev, mddev);
5989 if (err)
5990 export_rdev(rdev);
5991 return err;
5992 }
5993
5994 /*
5995 * add_new_disk can be used once the array is assembled
5996 * to add "hot spares". They must already have a superblock
5997 * written
5998 */
5999 if (mddev->pers) {
6000 int err;
6001 if (!mddev->pers->hot_add_disk) {
f72ffdd6 6002 printk(KERN_WARNING
1da177e4
LT		 6003 "%s: personality does not support diskops!\n",
6004 mdname(mddev));
6005 return -EINVAL;
6006 }
7b1e35f6
N		 6007 if (mddev->persistent)
6008 rdev = md_import_device(dev, mddev->major_version,
6009 mddev->minor_version);
6010 else
6011 rdev = md_import_device(dev, -1, -1);
1da177e4 6012 if (IS_ERR(rdev)) {
f72ffdd6 6013 printk(KERN_WARNING
1da177e4
LT		 6014 "md: md_import_device returned %ld\n",
6015 PTR_ERR(rdev));
6016 return PTR_ERR(rdev);
6017 }
1a855a06 6018 /* set saved_raid_disk if appropriate */
41158c7e
N		 6019 if (!mddev->persistent) {
6020 if (info->state & (1<<MD_DISK_SYNC) &&
bf572541 6021 info->raid_disk < mddev->raid_disks) {
41158c7e 6022 rdev->raid_disk = info->raid_disk;
bf572541 6023 set_bit(In_sync, &rdev->flags);
8313b8e5 6024 clear_bit(Bitmap_sync, &rdev->flags);
bf572541 6025 } else
41158c7e 6026 rdev->raid_disk = -1;
f466722c 6027 rdev->saved_raid_disk = rdev->raid_disk;
41158c7e
N		 6028 } else
6029 super_types[mddev->major_version].
6030 validate_super(mddev, rdev);
bedd86b7 6031 if ((info->state & (1<<MD_DISK_SYNC)) &&
f4563091 6032 rdev->raid_disk != info->raid_disk) {
bedd86b7
N		 6033 /* This was a hot-add request, but events doesn't
6034 * match, so reject it.
6035 */
6036 export_rdev(rdev);
6037 return -EINVAL;
6038 }
6039
b2d444d7 6040 clear_bit(In_sync, &rdev->flags); /* just to be sure */
8ddf9efe
N		 6041 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6042 set_bit(WriteMostly, &rdev->flags);
575a80fa
N		 6043 else
6044 clear_bit(WriteMostly, &rdev->flags);
8ddf9efe 6045
f6b6ec5c
SL		 6046 if (info->state & (1<<MD_DISK_JOURNAL)) {
6047 struct md_rdev *rdev2;
6048 bool has_journal = false;
6049
6050 /* make sure no existing journal disk */
6051 rdev_for_each(rdev2, mddev) {
6052 if (test_bit(Journal, &rdev2->flags)) {
6053 has_journal = true;
6054 break;
6055 }
6056 }
6057 if (has_journal) {
6058 export_rdev(rdev);
6059 return -EBUSY;
6060 }
bac624f3 6061 set_bit(Journal, &rdev->flags);
f6b6ec5c 6062 }
1aee41f6
GR		 6063 /*
6064 * check whether the device shows up in other nodes
6065 */
6066 if (mddev_is_clustered(mddev)) {
dbb64f86 6067 if (info->state & (1 << MD_DISK_CANDIDATE))
1aee41f6 6068 set_bit(Candidate, &rdev->flags);
dbb64f86 6069 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) {
1aee41f6 6070 /* --add initiated by this node */
dbb64f86 6071 err = md_cluster_ops->add_new_disk(mddev, rdev);
1aee41f6 6072 if (err) {
1aee41f6
GR		 6073 export_rdev(rdev);
6074 return err;
6075 }
6076 }
6077 }
6078
1da177e4
LT		 6079 rdev->raid_disk = -1;
6080 err = bind_rdev_to_array(rdev, mddev);
dbb64f86 6081
1da177e4
LT		 6082 if (err)
6083 export_rdev(rdev);
dbb64f86
GR		 6084
6085 if (mddev_is_clustered(mddev)) {
6086 if (info->state & (1 << MD_DISK_CANDIDATE))
6087 md_cluster_ops->new_disk_ack(mddev, (err == 0));
6088 else {
6089 if (err)
6090 md_cluster_ops->add_new_disk_cancel(mddev);
6091 else
6092 err = add_bound_rdev(rdev);
6093 }
6094
6095 } else if (!err)
a6da4ef8 6096 err = add_bound_rdev(rdev);
dbb64f86 6097
1da177e4
LT		 6098 return err;
6099 }
6100
6101 /* otherwise, add_new_disk is only allowed
6102 * for major_version==0 superblocks
6103 */
6104 if (mddev->major_version != 0) {
6105 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
6106 mdname(mddev));
6107 return -EINVAL;
6108 }
6109
6110 if (!(info->state & (1<<MD_DISK_FAULTY))) {
6111 int err;
d710e138 6112 rdev = md_import_device(dev, -1, 0);
1da177e4 6113 if (IS_ERR(rdev)) {
f72ffdd6 6114 printk(KERN_WARNING
1da177e4
LT		 6115 "md: error, md_import_device() returned %ld\n",
6116 PTR_ERR(rdev));
6117 return PTR_ERR(rdev);
6118 }
6119 rdev->desc_nr = info->number;
6120 if (info->raid_disk < mddev->raid_disks)
6121 rdev->raid_disk = info->raid_disk;
6122 else
6123 rdev->raid_disk = -1;
6124
1da177e4 6125 if (rdev->raid_disk < mddev->raid_disks)
b2d444d7
N		 6126 if (info->state & (1<<MD_DISK_SYNC))
6127 set_bit(In_sync, &rdev->flags);
1da177e4 6128
8ddf9efe
N		 6129 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
6130 set_bit(WriteMostly, &rdev->flags);
6131
1da177e4
LT		 6132 if (!mddev->persistent) {
6133 printk(KERN_INFO "md: nonpersistent superblock ...\n");
77304d2a
MS		 6134 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
6135 } else
57b2caa3 6136 rdev->sb_start = calc_dev_sboffset(rdev);
8190e754 6137 rdev->sectors = rdev->sb_start;
1da177e4 6138
2bf071bf
N		 6139 err = bind_rdev_to_array(rdev, mddev);
6140 if (err) {
6141 export_rdev(rdev);
6142 return err;
6143 }
1da177e4
LT		 6144 }
6145
6146 return 0;
6147}
6148
f72ffdd6 6149static int hot_remove_disk(struct mddev *mddev, dev_t dev)
1da177e4
LT		 6150{
6151 char b[BDEVNAME_SIZE];
3cb03002 6152 struct md_rdev *rdev;
1da177e4 6153
1da177e4
LT		 6154 rdev = find_rdev(mddev, dev);
6155 if (!rdev)
6156 return -ENXIO;
6157
2910ff17
GR		 6158 if (rdev->raid_disk < 0)
6159 goto kick_rdev;
293467aa 6160
3ea8929d
N		 6161 clear_bit(Blocked, &rdev->flags);
6162 remove_and_add_spares(mddev, rdev);
6163
1da177e4
LT		 6164 if (rdev->raid_disk >= 0)
6165 goto busy;
6166
2910ff17 6167kick_rdev:
54a88392 6168 if (mddev_is_clustered(mddev))
88bcfef7
GR		 6169 md_cluster_ops->remove_disk(mddev, rdev);
6170
fb56dfef 6171 md_kick_rdev_from_array(rdev);
850b2b42 6172 md_update_sb(mddev, 1);
d7603b7e 6173 md_new_event(mddev);
1da177e4
LT		 6174
6175 return 0;
6176busy:
fdefa4d8 6177 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
1da177e4
LT		 6178 bdevname(rdev->bdev,b), mdname(mddev));
6179 return -EBUSY;
6180}
6181
f72ffdd6 6182static int hot_add_disk(struct mddev *mddev, dev_t dev)
1da177e4
LT		 6183{
6184 char b[BDEVNAME_SIZE];
6185 int err;
3cb03002 6186 struct md_rdev *rdev;
1da177e4
LT		 6187
6188 if (!mddev->pers)
6189 return -ENODEV;
6190
6191 if (mddev->major_version != 0) {
6192 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
6193 " version-0 superblocks.\n",
6194 mdname(mddev));
6195 return -EINVAL;
6196 }
6197 if (!mddev->pers->hot_add_disk) {
f72ffdd6 6198 printk(KERN_WARNING
1da177e4
LT		 6199 "%s: personality does not support diskops!\n",
6200 mdname(mddev));
6201 return -EINVAL;
6202 }
6203
d710e138 6204 rdev = md_import_device(dev, -1, 0);
1da177e4 6205 if (IS_ERR(rdev)) {
f72ffdd6 6206 printk(KERN_WARNING
1da177e4
LT		 6207 "md: error, md_import_device() returned %ld\n",
6208 PTR_ERR(rdev));
6209 return -EINVAL;
6210 }
6211
6212 if (mddev->persistent)
57b2caa3 6213 rdev->sb_start = calc_dev_sboffset(rdev);
1da177e4 6214 else
77304d2a 6215 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
1da177e4 6216
8190e754 6217 rdev->sectors = rdev->sb_start;
1da177e4 6218
b2d444d7 6219 if (test_bit(Faulty, &rdev->flags)) {
f72ffdd6 6220 printk(KERN_WARNING
1da177e4
LT		 6221 "md: can not hot-add faulty %s disk to %s!\n",
6222 bdevname(rdev->bdev,b), mdname(mddev));
6223 err = -EINVAL;
6224 goto abort_export;
6225 }
293467aa 6226
b2d444d7 6227 clear_bit(In_sync, &rdev->flags);
1da177e4 6228 rdev->desc_nr = -1;
5842730d 6229 rdev->saved_raid_disk = -1;
2bf071bf
N		 6230 err = bind_rdev_to_array(rdev, mddev);
6231 if (err)
2aa82191 6232 goto abort_export;
1da177e4
LT		 6233
6234 /*
6235 * The rest should better be atomic, we can have disk failures
6236 * noticed in interrupt contexts ...
6237 */
6238
1da177e4
LT		 6239 rdev->raid_disk = -1;
6240
850b2b42 6241 md_update_sb(mddev, 1);
1da177e4
LT		 6242 /*
6243 * Kick recovery, maybe this spare has to be added to the
6244 * array immediately.
6245 */
6246 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6247 md_wakeup_thread(mddev->thread);
d7603b7e 6248 md_new_event(mddev);
1da177e4
LT		 6249 return 0;
6250
1da177e4
LT		 6251abort_export:
6252 export_rdev(rdev);
6253 return err;
6254}
6255
fd01b88c 6256static int set_bitmap_file(struct mddev *mddev, int fd)
32a7627c 6257{
035328c2 6258 int err = 0;
32a7627c 6259
36fa3063 6260 if (mddev->pers) {
d66b1b39 6261 if (!mddev->pers->quiesce || !mddev->thread)
36fa3063
N		 6262 return -EBUSY;
6263 if (mddev->recovery || mddev->sync_thread)
6264 return -EBUSY;
6265 /* we should be able to change the bitmap.. */
6266 }
32a7627c 6267
36fa3063 6268 if (fd >= 0) {
035328c2 6269 struct inode *inode;
1e594bb2
N		 6270 struct file *f;
6271
6272 if (mddev->bitmap || mddev->bitmap_info.file)
36fa3063 6273 return -EEXIST; /* cannot add when bitmap is present */
1e594bb2 6274 f = fget(fd);
32a7627c 6275
1e594bb2 6276 if (f == NULL) {
36fa3063
N		 6277 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
6278 mdname(mddev));
6279 return -EBADF;
6280 }
6281
1e594bb2 6282 inode = f->f_mapping->host;
035328c2
N		 6283 if (!S_ISREG(inode->i_mode)) {
6284 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
6285 mdname(mddev));
6286 err = -EBADF;
1e594bb2 6287 } else if (!(f->f_mode & FMODE_WRITE)) {
035328c2
N		 6288 printk(KERN_ERR "%s: error: bitmap file must open for write\n",
6289 mdname(mddev));
6290 err = -EBADF;
6291 } else if (atomic_read(&inode->i_writecount) != 1) {
36fa3063
N		 6292 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
6293 mdname(mddev));
035328c2
N		 6294 err = -EBUSY;
6295 }
6296 if (err) {
1e594bb2 6297 fput(f);
36fa3063
N		 6298 return err;
6299 }
1e594bb2 6300 mddev->bitmap_info.file = f;
c3d9714e 6301 mddev->bitmap_info.offset = 0; /* file overrides offset */
36fa3063
N		 6302 } else if (mddev->bitmap == NULL)
6303 return -ENOENT; /* cannot remove what isn't there */
6304 err = 0;
6305 if (mddev->pers) {
6306 mddev->pers->quiesce(mddev, 1);
69e51b44 6307 if (fd >= 0) {
f9209a32
GR		 6308 struct bitmap *bitmap;
6309
6310 bitmap = bitmap_create(mddev, -1);
6311 if (!IS_ERR(bitmap)) {
6312 mddev->bitmap = bitmap;
69e51b44 6313 err = bitmap_load(mddev);
ba599aca
N		 6314 } else
6315 err = PTR_ERR(bitmap);
69e51b44 6316 }
d7375ab3 6317 if (fd < 0 || err) {
36fa3063 6318 bitmap_destroy(mddev);
d7375ab3
N		 6319 fd = -1; /* make sure to put the file */
6320 }
36fa3063 6321 mddev->pers->quiesce(mddev, 0);
d7375ab3
N		 6322 }
6323 if (fd < 0) {
4af1a041
N		 6324 struct file *f = mddev->bitmap_info.file;
6325 if (f) {
6326 spin_lock(&mddev->lock);
6327 mddev->bitmap_info.file = NULL;
6328 spin_unlock(&mddev->lock);
6329 fput(f);
6330 }
36fa3063
N		 6331 }
6332
32a7627c
N		 6333 return err;
6334}
6335
1da177e4
LT		 6336/*
6337 * set_array_info is used two different ways
6338 * The original usage is when creating a new array.
6339 * In this usage, raid_disks is > 0 and it together with
6340 * level, size, not_persistent,layout,chunksize determine the
6341 * shape of the array.
6342 * This will always create an array with a type-0.90.0 superblock.
6343 * The newer usage is when assembling an array.
6344 * In this case raid_disks will be 0, and the major_version field is
6345 * use to determine which style super-blocks are to be found on the devices.
6346 * The minor and patch _version numbers are also kept incase the
6347 * super_block handler wishes to interpret them.
6348 */
f72ffdd6 6349static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
1da177e4
LT		 6350{
6351
6352 if (info->raid_disks == 0) {
6353 /* just setting version number for superblock loading */
6354 if (info->major_version < 0 ||
50511da3 6355 info->major_version >= ARRAY_SIZE(super_types) ||
1da177e4
LT		 6356 super_types[info->major_version].name == NULL) {
6357 /* maybe try to auto-load a module? */
f72ffdd6 6358 printk(KERN_INFO
1da177e4
LT		 6359 "md: superblock version %d not known\n",
6360 info->major_version);
6361 return -EINVAL;
6362 }
6363 mddev->major_version = info->major_version;
6364 mddev->minor_version = info->minor_version;
6365 mddev->patch_version = info->patch_version;
3f9d7b0d 6366 mddev->persistent = !info->not_persistent;
cbd19983
N		 6367 /* ensure mddev_put doesn't delete this now that there
6368 * is some minimal configuration.
6369 */
9ebc6ef1 6370 mddev->ctime = ktime_get_real_seconds();
1da177e4
LT		 6371 return 0;
6372 }
6373 mddev->major_version = MD_MAJOR_VERSION;
6374 mddev->minor_version = MD_MINOR_VERSION;
6375 mddev->patch_version = MD_PATCHLEVEL_VERSION;
9ebc6ef1 6376 mddev->ctime = ktime_get_real_seconds();
1da177e4
LT		 6377
6378 mddev->level = info->level;
17115e03 6379 mddev->clevel[0] = 0;
58c0fed4 6380 mddev->dev_sectors = 2 * (sector_t)info->size;
1da177e4
LT		 6381 mddev->raid_disks = info->raid_disks;
6382 /* don't set md_minor, it is determined by which /dev/md* was
6383 * openned
6384 */
6385 if (info->state & (1<<MD_SB_CLEAN))
6386 mddev->recovery_cp = MaxSector;
6387 else
6388 mddev->recovery_cp = 0;
6389 mddev->persistent = ! info->not_persistent;
e691063a 6390 mddev->external = 0;
1da177e4
LT		 6391
6392 mddev->layout = info->layout;
9d8f0363 6393 mddev->chunk_sectors = info->chunk_size >> 9;
1da177e4
LT		 6394
6395 mddev->max_disks = MD_SB_DISKS;
6396
e691063a
N		 6397 if (mddev->persistent)
6398 mddev->flags = 0;
850b2b42 6399 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 6400
c3d9714e 6401 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
6409bb05 6402 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
c3d9714e 6403 mddev->bitmap_info.offset = 0;
b2a2703c 6404
f6705578
N		 6405 mddev->reshape_position = MaxSector;
6406
1da177e4
LT		 6407 /*
6408 * Generate a 128 bit UUID
6409 */
6410 get_random_bytes(mddev->uuid, 16);
6411
f6705578 6412 mddev->new_level = mddev->level;
664e7c41 6413 mddev->new_chunk_sectors = mddev->chunk_sectors;
f6705578
N		 6414 mddev->new_layout = mddev->layout;
6415 mddev->delta_disks = 0;
2c810cdd 6416 mddev->reshape_backwards = 0;
f6705578 6417
1da177e4
LT		 6418 return 0;
6419}
6420
fd01b88c 6421void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
1f403624 6422{
b522adcd
DW		 6423 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
6424
6425 if (mddev->external_size)
6426 return;
6427
1f403624
DW		 6428 mddev->array_sectors = array_sectors;
6429}
6430EXPORT_SYMBOL(md_set_array_sectors);
6431
fd01b88c 6432static int update_size(struct mddev *mddev, sector_t num_sectors)
a35b0d69 6433{
3cb03002 6434 struct md_rdev *rdev;
a35b0d69 6435 int rv;
d71f9f88 6436 int fit = (num_sectors == 0);
a35b0d69
N		 6437
6438 if (mddev->pers->resize == NULL)
6439 return -EINVAL;
d71f9f88
AN		 6440 /* The "num_sectors" is the number of sectors of each device that
6441 * is used. This can only make sense for arrays with redundancy.
6442 * linear and raid0 always use whatever space is available. We can only
6443 * consider changing this number if no resync or reconstruction is
6444 * happening, and if the new size is acceptable. It must fit before the
0f420358 6445 * sb_start or, if that is <data_offset, it must fit before the size
d71f9f88
AN		 6446 * of each device. If num_sectors is zero, we find the largest size
6447 * that fits.
a35b0d69 6448 */
f851b60d
N		 6449 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6450 mddev->sync_thread)
a35b0d69 6451 return -EBUSY;
bd8839e0
N		 6452 if (mddev->ro)
6453 return -EROFS;
a4a6125a 6454
dafb20fa 6455 rdev_for_each(rdev, mddev) {
dd8ac336 6456 sector_t avail = rdev->sectors;
01ab5662 6457
d71f9f88
AN		 6458 if (fit && (num_sectors == 0 || num_sectors > avail))
6459 num_sectors = avail;
6460 if (avail < num_sectors)
a35b0d69
N		 6461 return -ENOSPC;
6462 }
d71f9f88 6463 rv = mddev->pers->resize(mddev, num_sectors);
449aad3e
N		 6464 if (!rv)
6465 revalidate_disk(mddev->gendisk);
a35b0d69
N		 6466 return rv;
6467}
6468
fd01b88c 6469static int update_raid_disks(struct mddev *mddev, int raid_disks)
da943b99
N		 6470{
6471 int rv;
c6563a8c 6472 struct md_rdev *rdev;
da943b99 6473 /* change the number of raid disks */
63c70c4f 6474 if (mddev->pers->check_reshape == NULL)
da943b99 6475 return -EINVAL;
bd8839e0
N		 6476 if (mddev->ro)
6477 return -EROFS;
da943b99 6478 if (raid_disks <= 0 ||
233fca36 6479 (mddev->max_disks && raid_disks >= mddev->max_disks))
da943b99 6480 return -EINVAL;
f851b60d
N		 6481 if (mddev->sync_thread ||
6482 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
6483 mddev->reshape_position != MaxSector)
da943b99 6484 return -EBUSY;
c6563a8c
N		 6485
6486 rdev_for_each(rdev, mddev) {
6487 if (mddev->raid_disks < raid_disks &&
6488 rdev->data_offset < rdev->new_data_offset)
6489 return -EINVAL;
6490 if (mddev->raid_disks > raid_disks &&
6491 rdev->data_offset > rdev->new_data_offset)
6492 return -EINVAL;
6493 }
6494
63c70c4f 6495 mddev->delta_disks = raid_disks - mddev->raid_disks;
2c810cdd
N		 6496 if (mddev->delta_disks < 0)
6497 mddev->reshape_backwards = 1;
6498 else if (mddev->delta_disks > 0)
6499 mddev->reshape_backwards = 0;
63c70c4f
N		 6500
6501 rv = mddev->pers->check_reshape(mddev);
2c810cdd 6502 if (rv < 0) {
de171cb9 6503 mddev->delta_disks = 0;
2c810cdd
N		 6504 mddev->reshape_backwards = 0;
6505 }
da943b99
N		 6506 return rv;
6507}
6508
1da177e4
LT		 6509/*
6510 * update_array_info is used to change the configuration of an
6511 * on-line array.
6512 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6513 * fields in the info are checked against the array.
6514 * Any differences that cannot be handled will cause an error.
6515 * Normally, only one change can be managed at a time.
6516 */
fd01b88c 6517static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
1da177e4
LT		 6518{
6519 int rv = 0;
6520 int cnt = 0;
36fa3063
N		 6521 int state = 0;
6522
6523 /* calculate expected state,ignoring low bits */
c3d9714e 6524 if (mddev->bitmap && mddev->bitmap_info.offset)
36fa3063 6525 state |= (1 << MD_SB_BITMAP_PRESENT);
1da177e4
LT		 6526
6527 if (mddev->major_version != info->major_version ||
6528 mddev->minor_version != info->minor_version ||
6529/* mddev->patch_version != info->patch_version || */
6530 mddev->ctime != info->ctime ||
6531 mddev->level != info->level ||
6532/* mddev->layout != info->layout || */
4e023612 6533 mddev->persistent != !info->not_persistent ||
9d8f0363 6534 mddev->chunk_sectors != info->chunk_size >> 9 ||
36fa3063
N		 6535 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6536 ((state^info->state) & 0xfffffe00)
6537 )
1da177e4
LT		 6538 return -EINVAL;
6539 /* Check there is only one change */
58c0fed4
AN		 6540 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
6541 cnt++;
6542 if (mddev->raid_disks != info->raid_disks)
6543 cnt++;
6544 if (mddev->layout != info->layout)
6545 cnt++;
6546 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
6547 cnt++;
6548 if (cnt == 0)
6549 return 0;
6550 if (cnt > 1)
6551 return -EINVAL;
1da177e4
LT		 6552
6553 if (mddev->layout != info->layout) {
6554 /* Change layout
6555 * we don't need to do anything at the md level, the
6556 * personality will take care of it all.
6557 */
50ac168a 6558 if (mddev->pers->check_reshape == NULL)
1da177e4 6559 return -EINVAL;
597a711b
N		 6560 else {
6561 mddev->new_layout = info->layout;
50ac168a 6562 rv = mddev->pers->check_reshape(mddev);
597a711b
N		 6563 if (rv)
6564 mddev->new_layout = mddev->layout;
6565 return rv;
6566 }
1da177e4 6567 }
58c0fed4 6568 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
d71f9f88 6569 rv = update_size(mddev, (sector_t)info->size * 2);
a35b0d69 6570
da943b99
N		 6571 if (mddev->raid_disks != info->raid_disks)
6572 rv = update_raid_disks(mddev, info->raid_disks);
6573
36fa3063 6574 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
293467aa
GR		 6575 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) {
6576 rv = -EINVAL;
6577 goto err;
6578 }
6579 if (mddev->recovery || mddev->sync_thread) {
6580 rv = -EBUSY;
6581 goto err;
6582 }
36fa3063 6583 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
f9209a32 6584 struct bitmap *bitmap;
36fa3063 6585 /* add the bitmap */
293467aa
GR		 6586 if (mddev->bitmap) {
6587 rv = -EEXIST;
6588 goto err;
6589 }
6590 if (mddev->bitmap_info.default_offset == 0) {
6591 rv = -EINVAL;
6592 goto err;
6593 }
c3d9714e
N		 6594 mddev->bitmap_info.offset =
6595 mddev->bitmap_info.default_offset;
6409bb05
N		 6596 mddev->bitmap_info.space =
6597 mddev->bitmap_info.default_space;
36fa3063 6598 mddev->pers->quiesce(mddev, 1);
f9209a32
GR		 6599 bitmap = bitmap_create(mddev, -1);
6600 if (!IS_ERR(bitmap)) {
6601 mddev->bitmap = bitmap;
69e51b44 6602 rv = bitmap_load(mddev);
ba599aca
N		 6603 } else
6604 rv = PTR_ERR(bitmap);
36fa3063
N		 6605 if (rv)
6606 bitmap_destroy(mddev);
6607 mddev->pers->quiesce(mddev, 0);
6608 } else {
6609 /* remove the bitmap */
293467aa
GR		 6610 if (!mddev->bitmap) {
6611 rv = -ENOENT;
6612 goto err;
6613 }
6614 if (mddev->bitmap->storage.file) {
6615 rv = -EINVAL;
6616 goto err;
6617 }
f6a2dc64
GJ		 6618 if (mddev->bitmap_info.nodes) {
6619 /* hold PW on all the bitmap lock */
6620 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
6621 printk("md: can't change bitmap to none since the"
6622 " array is in use by more than one node\n");
6623 rv = -EPERM;
6624 md_cluster_ops->unlock_all_bitmaps(mddev);
6625 goto err;
6626 }
6627
6628 mddev->bitmap_info.nodes = 0;
6629 md_cluster_ops->leave(mddev);
6630 }
36fa3063
N		 6631 mddev->pers->quiesce(mddev, 1);
6632 bitmap_destroy(mddev);
6633 mddev->pers->quiesce(mddev, 0);
c3d9714e 6634 mddev->bitmap_info.offset = 0;
36fa3063
N		 6635 }
6636 }
850b2b42 6637 md_update_sb(mddev, 1);
293467aa
GR		 6638 return rv;
6639err:
1da177e4
LT		 6640 return rv;
6641}
6642
fd01b88c 6643static int set_disk_faulty(struct mddev *mddev, dev_t dev)
1da177e4 6644{
3cb03002 6645 struct md_rdev *rdev;
1ca69c4b 6646 int err = 0;
1da177e4
LT		 6647
6648 if (mddev->pers == NULL)
6649 return -ENODEV;
6650
1ca69c4b
N		 6651 rcu_read_lock();
6652 rdev = find_rdev_rcu(mddev, dev);
1da177e4 6653 if (!rdev)
1ca69c4b
N		 6654 err = -ENODEV;
6655 else {
6656 md_error(mddev, rdev);
6657 if (!test_bit(Faulty, &rdev->flags))
6658 err = -EBUSY;
6659 }
6660 rcu_read_unlock();
6661 return err;
1da177e4
LT		 6662}
6663
2f9618ce
AN		 6664/*
6665 * We have a problem here : there is no easy way to give a CHS
6666 * virtual geometry. We currently pretend that we have a 2 heads
6667 * 4 sectors (with a BIG number of cylinders...). This drives
6668 * dosfs just mad... ;-)
6669 */
a885c8c4
CH		 6670static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
6671{
fd01b88c 6672 struct mddev *mddev = bdev->bd_disk->private_data;
a885c8c4
CH		 6673
6674 geo->heads = 2;
6675 geo->sectors = 4;
49ce6cea 6676 geo->cylinders = mddev->array_sectors / 8;
a885c8c4
CH		 6677 return 0;
6678}
6679
cb335f88
NS		 6680static inline bool md_ioctl_valid(unsigned int cmd)
6681{
6682 switch (cmd) {
6683 case ADD_NEW_DISK:
6684 case BLKROSET:
6685 case GET_ARRAY_INFO:
6686 case GET_BITMAP_FILE:
6687 case GET_DISK_INFO:
6688 case HOT_ADD_DISK:
6689 case HOT_REMOVE_DISK:
cb335f88
NS		 6690 case RAID_AUTORUN:
6691 case RAID_VERSION:
6692 case RESTART_ARRAY_RW:
6693 case RUN_ARRAY:
6694 case SET_ARRAY_INFO:
6695 case SET_BITMAP_FILE:
6696 case SET_DISK_FAULTY:
6697 case STOP_ARRAY:
6698 case STOP_ARRAY_RO:
1aee41f6 6699 case CLUSTERED_DISK_NACK:
cb335f88
NS		 6700 return true;
6701 default:
6702 return false;
6703 }
6704}
6705
a39907fa 6706static int md_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 6707 unsigned int cmd, unsigned long arg)
6708{
6709 int err = 0;
6710 void __user *argp = (void __user *)arg;
fd01b88c 6711 struct mddev *mddev = NULL;
e2218350 6712 int ro;
1da177e4 6713
cb335f88
NS		 6714 if (!md_ioctl_valid(cmd))
6715 return -ENOTTY;
6716
506c9e44
N		 6717 switch (cmd) {
6718 case RAID_VERSION:
6719 case GET_ARRAY_INFO:
6720 case GET_DISK_INFO:
6721 break;
6722 default:
6723 if (!capable(CAP_SYS_ADMIN))
6724 return -EACCES;
6725 }
1da177e4
LT		 6726
6727 /*
6728 * Commands dealing with the RAID driver but not any
6729 * particular array:
6730 */
c02c0aeb
N		 6731 switch (cmd) {
6732 case RAID_VERSION:
6733 err = get_version(argp);
3adc28d8 6734 goto out;
1da177e4 6735
1da177e4 6736#ifndef MODULE
c02c0aeb
N		 6737 case RAID_AUTORUN:
6738 err = 0;
6739 autostart_arrays(arg);
3adc28d8 6740 goto out;
1da177e4 6741#endif
c02c0aeb 6742 default:;
1da177e4
LT		 6743 }
6744
6745 /*
6746 * Commands creating/starting a new array:
6747 */
6748
a39907fa 6749 mddev = bdev->bd_disk->private_data;
1da177e4
LT		 6750
6751 if (!mddev) {
6752 BUG();
3adc28d8 6753 goto out;
1da177e4
LT		 6754 }
6755
1ca69c4b
N		 6756 /* Some actions do not requires the mutex */
6757 switch (cmd) {
6758 case GET_ARRAY_INFO:
6759 if (!mddev->raid_disks && !mddev->external)
6760 err = -ENODEV;
6761 else
6762 err = get_array_info(mddev, argp);
3adc28d8 6763 goto out;
1ca69c4b
N		 6764
6765 case GET_DISK_INFO:
6766 if (!mddev->raid_disks && !mddev->external)
6767 err = -ENODEV;
6768 else
6769 err = get_disk_info(mddev, argp);
3adc28d8 6770 goto out;
1ca69c4b
N		 6771
6772 case SET_DISK_FAULTY:
6773 err = set_disk_faulty(mddev, new_decode_dev(arg));
3adc28d8 6774 goto out;
4af1a041
N		 6775
6776 case GET_BITMAP_FILE:
6777 err = get_bitmap_file(mddev, argp);
6778 goto out;
6779
1ca69c4b
N		 6780 }
6781
a7a3f08d
N		 6782 if (cmd == ADD_NEW_DISK)
6783 /* need to ensure md_delayed_delete() has completed */
6784 flush_workqueue(md_misc_wq);
6785
90f5f7ad
HR		 6786 if (cmd == HOT_REMOVE_DISK)
6787 /* need to ensure recovery thread has run */
6788 wait_event_interruptible_timeout(mddev->sb_wait,
6789 !test_bit(MD_RECOVERY_NEEDED,
6790 &mddev->flags),
6791 msecs_to_jiffies(5000));
260fa034
N		 6792 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) {
6793 /* Need to flush page cache, and ensure no-one else opens
6794 * and writes
6795 */
6796 mutex_lock(&mddev->open_mutex);
9ba3b7f5 6797 if (mddev->pers && atomic_read(&mddev->openers) > 1) {
260fa034
N		 6798 mutex_unlock(&mddev->open_mutex);
6799 err = -EBUSY;
3adc28d8 6800 goto out;
260fa034
N		 6801 }
6802 set_bit(MD_STILL_CLOSED, &mddev->flags);
6803 mutex_unlock(&mddev->open_mutex);
6804 sync_blockdev(bdev);
6805 }
1da177e4
LT		 6806 err = mddev_lock(mddev);
6807 if (err) {
f72ffdd6 6808 printk(KERN_INFO
1da177e4
LT		 6809 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6810 err, cmd);
3adc28d8 6811 goto out;
1da177e4
LT		 6812 }
6813
c02c0aeb
N		 6814 if (cmd == SET_ARRAY_INFO) {
6815 mdu_array_info_t info;
6816 if (!arg)
6817 memset(&info, 0, sizeof(info));
6818 else if (copy_from_user(&info, argp, sizeof(info))) {
6819 err = -EFAULT;
3adc28d8 6820 goto unlock;
c02c0aeb
N		 6821 }
6822 if (mddev->pers) {
6823 err = update_array_info(mddev, &info);
6824 if (err) {
6825 printk(KERN_WARNING "md: couldn't update"
6826 " array info. %d\n", err);
3adc28d8 6827 goto unlock;
1da177e4 6828 }
3adc28d8 6829 goto unlock;
c02c0aeb
N		 6830 }
6831 if (!list_empty(&mddev->disks)) {
6832 printk(KERN_WARNING
6833 "md: array %s already has disks!\n",
6834 mdname(mddev));
6835 err = -EBUSY;
3adc28d8 6836 goto unlock;
c02c0aeb
N		 6837 }
6838 if (mddev->raid_disks) {
6839 printk(KERN_WARNING
6840 "md: array %s already initialised!\n",
6841 mdname(mddev));
6842 err = -EBUSY;
3adc28d8 6843 goto unlock;
c02c0aeb
N		 6844 }
6845 err = set_array_info(mddev, &info);
6846 if (err) {
6847 printk(KERN_WARNING "md: couldn't set"
6848 " array info. %d\n", err);
3adc28d8 6849 goto unlock;
c02c0aeb 6850 }
3adc28d8 6851 goto unlock;
1da177e4
LT		 6852 }
6853
6854 /*
6855 * Commands querying/configuring an existing array:
6856 */
32a7627c 6857 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3f9d7b0d 6858 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
a17184a9
N		 6859 if ((!mddev->raid_disks && !mddev->external)
6860 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
6861 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
6862 && cmd != GET_BITMAP_FILE) {
1da177e4 6863 err = -ENODEV;
3adc28d8 6864 goto unlock;
1da177e4
LT		 6865 }
6866
6867 /*
6868 * Commands even a read-only array can execute:
6869 */
c02c0aeb 6870 switch (cmd) {
c02c0aeb
N		 6871 case RESTART_ARRAY_RW:
6872 err = restart_array(mddev);
3adc28d8 6873 goto unlock;
1da177e4 6874
c02c0aeb
N		 6875 case STOP_ARRAY:
6876 err = do_md_stop(mddev, 0, bdev);
3adc28d8 6877 goto unlock;
1da177e4 6878
c02c0aeb
N		 6879 case STOP_ARRAY_RO:
6880 err = md_set_readonly(mddev, bdev);
3adc28d8 6881 goto unlock;
1da177e4 6882
3ea8929d
N		 6883 case HOT_REMOVE_DISK:
6884 err = hot_remove_disk(mddev, new_decode_dev(arg));
3adc28d8 6885 goto unlock;
3ea8929d 6886
7ceb17e8
N		 6887 case ADD_NEW_DISK:
6888 /* We can support ADD_NEW_DISK on read-only arrays
466ad292 6889 * only if we are re-adding a preexisting device.
7ceb17e8
N		 6890 * So require mddev->pers and MD_DISK_SYNC.
6891 */
6892 if (mddev->pers) {
6893 mdu_disk_info_t info;
6894 if (copy_from_user(&info, argp, sizeof(info)))
6895 err = -EFAULT;
6896 else if (!(info.state & (1<<MD_DISK_SYNC)))
6897 /* Need to clear read-only for this */
6898 break;
6899 else
6900 err = add_new_disk(mddev, &info);
3adc28d8 6901 goto unlock;
7ceb17e8
N		 6902 }
6903 break;
6904
c02c0aeb
N		 6905 case BLKROSET:
6906 if (get_user(ro, (int __user *)(arg))) {
6907 err = -EFAULT;
3adc28d8 6908 goto unlock;
c02c0aeb
N		 6909 }
6910 err = -EINVAL;
e2218350 6911
c02c0aeb
N		 6912 /* if the bdev is going readonly the value of mddev->ro
6913 * does not matter, no writes are coming
6914 */
6915 if (ro)
3adc28d8 6916 goto unlock;
e2218350 6917
c02c0aeb
N		 6918 /* are we are already prepared for writes? */
6919 if (mddev->ro != 1)
3adc28d8 6920 goto unlock;
e2218350 6921
c02c0aeb
N		 6922 /* transitioning to readauto need only happen for
6923 * arrays that call md_write_start
6924 */
6925 if (mddev->pers) {
6926 err = restart_array(mddev);
6927 if (err == 0) {
6928 mddev->ro = 2;
6929 set_disk_ro(mddev->gendisk, 0);
e2218350 6930 }
c02c0aeb 6931 }
3adc28d8 6932 goto unlock;
1da177e4
LT		 6933 }
6934
6935 /*
6936 * The remaining ioctls are changing the state of the
f91de92e 6937 * superblock, so we do not allow them on read-only arrays.
1da177e4 6938 */
326eb17d 6939 if (mddev->ro && mddev->pers) {
f91de92e
N		 6940 if (mddev->ro == 2) {
6941 mddev->ro = 0;
00bcb4ac 6942 sysfs_notify_dirent_safe(mddev->sysfs_state);
0fd62b86 6943 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
f3378b48
N		 6944 /* mddev_unlock will wake thread */
6945 /* If a device failed while we were read-only, we
6946 * need to make sure the metadata is updated now.
6947 */
6948 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
6949 mddev_unlock(mddev);
6950 wait_event(mddev->sb_wait,
6951 !test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
6952 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
29f097c4 6953 mddev_lock_nointr(mddev);
f3378b48 6954 }
f91de92e
N		 6955 } else {
6956 err = -EROFS;
3adc28d8 6957 goto unlock;
f91de92e 6958 }
1da177e4
LT		 6959 }
6960
c02c0aeb
N		 6961 switch (cmd) {
6962 case ADD_NEW_DISK:
1da177e4 6963 {
c02c0aeb
N		 6964 mdu_disk_info_t info;
6965 if (copy_from_user(&info, argp, sizeof(info)))
6966 err = -EFAULT;
6967 else
6968 err = add_new_disk(mddev, &info);
3adc28d8 6969 goto unlock;
c02c0aeb 6970 }
1da177e4 6971
1aee41f6
GR		 6972 case CLUSTERED_DISK_NACK:
6973 if (mddev_is_clustered(mddev))
6974 md_cluster_ops->new_disk_ack(mddev, false);
6975 else
6976 err = -EINVAL;
6977 goto unlock;
6978
c02c0aeb
N		 6979 case HOT_ADD_DISK:
6980 err = hot_add_disk(mddev, new_decode_dev(arg));
3adc28d8 6981 goto unlock;
1da177e4 6982
c02c0aeb
N		 6983 case RUN_ARRAY:
6984 err = do_md_run(mddev);
3adc28d8 6985 goto unlock;
1da177e4 6986
c02c0aeb
N		 6987 case SET_BITMAP_FILE:
6988 err = set_bitmap_file(mddev, (int)arg);
3adc28d8 6989 goto unlock;
32a7627c 6990
c02c0aeb
N		 6991 default:
6992 err = -EINVAL;
3adc28d8 6993 goto unlock;
1da177e4
LT		 6994 }
6995
3adc28d8 6996unlock:
d3374825
N		 6997 if (mddev->hold_active == UNTIL_IOCTL &&
6998 err != -EINVAL)
6999 mddev->hold_active = 0;
1da177e4 7000 mddev_unlock(mddev);
3adc28d8 7001out:
1da177e4
LT		 7002 return err;
7003}
aa98aa31
AB		 7004#ifdef CONFIG_COMPAT
7005static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
7006 unsigned int cmd, unsigned long arg)
7007{
7008 switch (cmd) {
7009 case HOT_REMOVE_DISK:
7010 case HOT_ADD_DISK:
7011 case SET_DISK_FAULTY:
7012 case SET_BITMAP_FILE:
7013 /* These take in integer arg, do not convert */
7014 break;
7015 default:
7016 arg = (unsigned long)compat_ptr(arg);
7017 break;
7018 }
7019
7020 return md_ioctl(bdev, mode, cmd, arg);
7021}
7022#endif /* CONFIG_COMPAT */
1da177e4 7023
a39907fa 7024static int md_open(struct block_device *bdev, fmode_t mode)
1da177e4
LT		 7025{
7026 /*
7027 * Succeed if we can lock the mddev, which confirms that
7028 * it isn't being stopped right now.
7029 */
fd01b88c 7030 struct mddev *mddev = mddev_find(bdev->bd_dev);
1da177e4
LT		 7031 int err;
7032
0c098220
YL		 7033 if (!mddev)
7034 return -ENODEV;
7035
d3374825
N		 7036 if (mddev->gendisk != bdev->bd_disk) {
7037 /* we are racing with mddev_put which is discarding this
7038 * bd_disk.
7039 */
7040 mddev_put(mddev);
7041 /* Wait until bdev->bd_disk is definitely gone */
e804ac78 7042 flush_workqueue(md_misc_wq);
d3374825
N		 7043 /* Then retry the open from the top */
7044 return -ERESTARTSYS;
7045 }
7046 BUG_ON(mddev != bdev->bd_disk->private_data);
7047
c8c00a69 7048 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
1da177e4
LT		 7049 goto out;
7050
7051 err = 0;
f2ea68cf 7052 atomic_inc(&mddev->openers);
260fa034 7053 clear_bit(MD_STILL_CLOSED, &mddev->flags);
c8c00a69 7054 mutex_unlock(&mddev->open_mutex);
1da177e4 7055
f0b4f7e2 7056 check_disk_change(bdev);
1da177e4
LT		 7057 out:
7058 return err;
7059}
7060
db2a144b 7061static void md_release(struct gendisk *disk, fmode_t mode)
1da177e4 7062{
f72ffdd6 7063 struct mddev *mddev = disk->private_data;
1da177e4 7064
52e5f9d1 7065 BUG_ON(!mddev);
f2ea68cf 7066 atomic_dec(&mddev->openers);
1da177e4 7067 mddev_put(mddev);
1da177e4 7068}
f0b4f7e2
N		 7069
7070static int md_media_changed(struct gendisk *disk)
7071{
fd01b88c 7072 struct mddev *mddev = disk->private_data;
f0b4f7e2
N		 7073
7074 return mddev->changed;
7075}
7076
7077static int md_revalidate(struct gendisk *disk)
7078{
fd01b88c 7079 struct mddev *mddev = disk->private_data;
f0b4f7e2
N		 7080
7081 mddev->changed = 0;
7082 return 0;
7083}
83d5cde4 7084static const struct block_device_operations md_fops =
1da177e4
LT		 7085{
7086 .owner = THIS_MODULE,
a39907fa
AV		 7087 .open = md_open,
7088 .release = md_release,
b492b852 7089 .ioctl = md_ioctl,
aa98aa31
AB		 7090#ifdef CONFIG_COMPAT
7091 .compat_ioctl = md_compat_ioctl,
7092#endif
a885c8c4 7093 .getgeo = md_getgeo,
f0b4f7e2
N		 7094 .media_changed = md_media_changed,
7095 .revalidate_disk= md_revalidate,
1da177e4
LT		 7096};
7097
f72ffdd6 7098static int md_thread(void *arg)
1da177e4 7099{
2b8bf345 7100 struct md_thread *thread = arg;
1da177e4 7101
1da177e4
LT		 7102 /*
7103 * md_thread is a 'system-thread', it's priority should be very
7104 * high. We avoid resource deadlocks individually in each
7105 * raid personality. (RAID5 does preallocation) We also use RR and
7106 * the very same RT priority as kswapd, thus we will never get
7107 * into a priority inversion deadlock.
7108 *
7109 * we definitely have to have equal or higher priority than
7110 * bdflush, otherwise bdflush will deadlock if there are too
7111 * many dirty RAID5 blocks.
7112 */
1da177e4 7113
6985c43f 7114 allow_signal(SIGKILL);
a6fb0934 7115 while (!kthread_should_stop()) {
1da177e4 7116
93588e22
N		 7117 /* We need to wait INTERRUPTIBLE so that
7118 * we don't add to the load-average.
7119 * That means we need to be sure no signals are
7120 * pending
7121 */
7122 if (signal_pending(current))
7123 flush_signals(current);
7124
7125 wait_event_interruptible_timeout
7126 (thread->wqueue,
7127 test_bit(THREAD_WAKEUP, &thread->flags)
7128 || kthread_should_stop(),
7129 thread->timeout);
1da177e4 7130
6c987910
N		 7131 clear_bit(THREAD_WAKEUP, &thread->flags);
7132 if (!kthread_should_stop())
4ed8731d 7133 thread->run(thread);
1da177e4 7134 }
a6fb0934 7135
1da177e4
LT		 7136 return 0;
7137}
7138
2b8bf345 7139void md_wakeup_thread(struct md_thread *thread)
1da177e4
LT		 7140{
7141 if (thread) {
36a4e1fe 7142 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
1da177e4
LT		 7143 set_bit(THREAD_WAKEUP, &thread->flags);
7144 wake_up(&thread->wqueue);
7145 }
7146}
6c144d31 7147EXPORT_SYMBOL(md_wakeup_thread);
1da177e4 7148
4ed8731d
SL		 7149struct md_thread *md_register_thread(void (*run) (struct md_thread *),
7150 struct mddev *mddev, const char *name)
1da177e4 7151{
2b8bf345 7152 struct md_thread *thread;
1da177e4 7153
2b8bf345 7154 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
1da177e4
LT		 7155 if (!thread)
7156 return NULL;
7157
1da177e4
LT		 7158 init_waitqueue_head(&thread->wqueue);
7159
1da177e4
LT		 7160 thread->run = run;
7161 thread->mddev = mddev;
32a7627c 7162 thread->timeout = MAX_SCHEDULE_TIMEOUT;
0da3c619
N		 7163 thread->tsk = kthread_run(md_thread, thread,
7164 "%s_%s",
7165 mdname(thread->mddev),
0232605d 7166 name);
a6fb0934 7167 if (IS_ERR(thread->tsk)) {
1da177e4
LT		 7168 kfree(thread);
7169 return NULL;
7170 }
1da177e4
LT		 7171 return thread;
7172}
6c144d31 7173EXPORT_SYMBOL(md_register_thread);
1da177e4 7174
2b8bf345 7175void md_unregister_thread(struct md_thread **threadp)
1da177e4 7176{
2b8bf345 7177 struct md_thread *thread = *threadp;
e0cf8f04
N		 7178 if (!thread)
7179 return;
36a4e1fe 7180 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
01f96c0a
N		 7181 /* Locking ensures that mddev_unlock does not wake_up a
7182 * non-existent thread
7183 */
7184 spin_lock(&pers_lock);
7185 *threadp = NULL;
7186 spin_unlock(&pers_lock);
a6fb0934
N		 7187
7188 kthread_stop(thread->tsk);
1da177e4
LT		 7189 kfree(thread);
7190}
6c144d31 7191EXPORT_SYMBOL(md_unregister_thread);
1da177e4 7192
fd01b88c 7193void md_error(struct mddev *mddev, struct md_rdev *rdev)
1da177e4 7194{
b2d444d7 7195 if (!rdev || test_bit(Faulty, &rdev->flags))
1da177e4 7196 return;
6bfe0b49 7197
de393cde 7198 if (!mddev->pers || !mddev->pers->error_handler)
1da177e4
LT		 7199 return;
7200 mddev->pers->error_handler(mddev,rdev);
72a23c21
NB		 7201 if (mddev->degraded)
7202 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
00bcb4ac 7203 sysfs_notify_dirent_safe(rdev->sysfs_state);
1da177e4
LT		 7204 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
7205 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7206 md_wakeup_thread(mddev->thread);
768a418d 7207 if (mddev->event_work.func)
e804ac78 7208 queue_work(md_misc_wq, &mddev->event_work);
bb9ef716 7209 md_new_event(mddev);
1da177e4 7210}
6c144d31 7211EXPORT_SYMBOL(md_error);
1da177e4
LT		 7212
7213/* seq_file implementation /proc/mdstat */
7214
7215static void status_unused(struct seq_file *seq)
7216{
7217 int i = 0;
3cb03002 7218 struct md_rdev *rdev;
1da177e4
LT		 7219
7220 seq_printf(seq, "unused devices: ");
7221
159ec1fc 7222 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
1da177e4
LT		 7223 char b[BDEVNAME_SIZE];
7224 i++;
7225 seq_printf(seq, "%s ",
7226 bdevname(rdev->bdev,b));
7227 }
7228 if (!i)
7229 seq_printf(seq, "<none>");
7230
7231 seq_printf(seq, "\n");
7232}
7233
f7851be7 7234static int status_resync(struct seq_file *seq, struct mddev *mddev)
1da177e4 7235{
dd71cf6b
N		 7236 sector_t max_sectors, resync, res;
7237 unsigned long dt, db;
7238 sector_t rt;
4588b42e
N		 7239 int scale;
7240 unsigned int per_milli;
1da177e4 7241
c804cdec
N		 7242 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
7243 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
dd71cf6b 7244 max_sectors = mddev->resync_max_sectors;
1da177e4 7245 else
dd71cf6b 7246 max_sectors = mddev->dev_sectors;
1da177e4 7247
f7851be7
N		 7248 resync = mddev->curr_resync;
7249 if (resync <= 3) {
7250 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7251 /* Still cleaning up */
7252 resync = max_sectors;
7253 } else
7254 resync -= atomic_read(&mddev->recovery_active);
7255
7256 if (resync == 0) {
7257 if (mddev->recovery_cp < MaxSector) {
7258 seq_printf(seq, "\tresync=PENDING");
7259 return 1;
7260 }
7261 return 0;
7262 }
7263 if (resync < 3) {
7264 seq_printf(seq, "\tresync=DELAYED");
7265 return 1;
7266 }
7267
403df478 7268 WARN_ON(max_sectors == 0);
4588b42e 7269 /* Pick 'scale' such that (resync>>scale)*1000 will fit
dd71cf6b 7270 * in a sector_t, and (max_sectors>>scale) will fit in a
4588b42e
N		 7271 * u32, as those are the requirements for sector_div.
7272 * Thus 'scale' must be at least 10
7273 */
7274 scale = 10;
7275 if (sizeof(sector_t) > sizeof(unsigned long)) {
dd71cf6b 7276 while ( max_sectors/2 > (1ULL<<(scale+32)))
4588b42e
N		 7277 scale++;
7278 }
7279 res = (resync>>scale)*1000;
dd71cf6b 7280 sector_div(res, (u32)((max_sectors>>scale)+1));
4588b42e
N		 7281
7282 per_milli = res;
1da177e4 7283 {
4588b42e 7284 int i, x = per_milli/50, y = 20-x;
1da177e4
LT		 7285 seq_printf(seq, "[");
7286 for (i = 0; i < x; i++)
7287 seq_printf(seq, "=");
7288 seq_printf(seq, ">");
7289 for (i = 0; i < y; i++)
7290 seq_printf(seq, ".");
7291 seq_printf(seq, "] ");
7292 }
4588b42e 7293 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
ccfcc3c1
N		 7294 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
7295 "reshape" :
61df9d91
N		 7296 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
7297 "check" :
7298 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
7299 "resync" : "recovery"))),
7300 per_milli/10, per_milli % 10,
dd71cf6b
N		 7301 (unsigned long long) resync/2,
7302 (unsigned long long) max_sectors/2);
1da177e4
LT		 7303
7304 /*
1da177e4
LT		 7305 * dt: time from mark until now
7306 * db: blocks written from mark until now
7307 * rt: remaining time
dd71cf6b
N		 7308 *
7309 * rt is a sector_t, so could be 32bit or 64bit.
7310 * So we divide before multiply in case it is 32bit and close
7311 * to the limit.
25985edc 7312 * We scale the divisor (db) by 32 to avoid losing precision
dd71cf6b
N		 7313 * near the end of resync when the number of remaining sectors
7314 * is close to 'db'.
7315 * We then divide rt by 32 after multiplying by db to compensate.
7316 * The '+1' avoids division by zero if db is very small.
1da177e4
LT		 7317 */
7318 dt = ((jiffies - mddev->resync_mark) / HZ);
7319 if (!dt) dt++;
ff4e8d9a
N		 7320 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
7321 - mddev->resync_mark_cnt;
1da177e4 7322
dd71cf6b
N		 7323 rt = max_sectors - resync; /* number of remaining sectors */
7324 sector_div(rt, db/32+1);
7325 rt *= dt;
7326 rt >>= 5;
7327
7328 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
7329 ((unsigned long)rt % 60)/6);
1da177e4 7330
ff4e8d9a 7331 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
f7851be7 7332 return 1;
1da177e4
LT		 7333}
7334
7335static void *md_seq_start(struct seq_file *seq, loff_t *pos)
7336{
7337 struct list_head *tmp;
7338 loff_t l = *pos;
fd01b88c 7339 struct mddev *mddev;
1da177e4
LT		 7340
7341 if (l >= 0x10000)
7342 return NULL;
7343 if (!l--)
7344 /* header */
7345 return (void*)1;
7346
7347 spin_lock(&all_mddevs_lock);
7348 list_for_each(tmp,&all_mddevs)
7349 if (!l--) {
fd01b88c 7350 mddev = list_entry(tmp, struct mddev, all_mddevs);
1da177e4
LT		 7351 mddev_get(mddev);
7352 spin_unlock(&all_mddevs_lock);
7353 return mddev;
7354 }
7355 spin_unlock(&all_mddevs_lock);
7356 if (!l--)
7357 return (void*)2;/* tail */
7358 return NULL;
7359}
7360
7361static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
7362{
7363 struct list_head *tmp;
fd01b88c 7364 struct mddev *next_mddev, *mddev = v;
f72ffdd6 7365
1da177e4
LT		 7366 ++*pos;
7367 if (v == (void*)2)
7368 return NULL;
7369
7370 spin_lock(&all_mddevs_lock);
7371 if (v == (void*)1)
7372 tmp = all_mddevs.next;
7373 else
7374 tmp = mddev->all_mddevs.next;
7375 if (tmp != &all_mddevs)
fd01b88c 7376 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
1da177e4
LT		 7377 else {
7378 next_mddev = (void*)2;
7379 *pos = 0x10000;
f72ffdd6 7380 }
1da177e4
LT		 7381 spin_unlock(&all_mddevs_lock);
7382
7383 if (v != (void*)1)
7384 mddev_put(mddev);
7385 return next_mddev;
7386
7387}
7388
7389static void md_seq_stop(struct seq_file *seq, void *v)
7390{
fd01b88c 7391 struct mddev *mddev = v;
1da177e4
LT		 7392
7393 if (mddev && v != (void*)1 && v != (void*)2)
7394 mddev_put(mddev);
7395}
7396
7397static int md_seq_show(struct seq_file *seq, void *v)
7398{
fd01b88c 7399 struct mddev *mddev = v;
dd8ac336 7400 sector_t sectors;
3cb03002 7401 struct md_rdev *rdev;
1da177e4
LT		 7402
7403 if (v == (void*)1) {
84fc4b56 7404 struct md_personality *pers;
1da177e4
LT		 7405 seq_printf(seq, "Personalities : ");
7406 spin_lock(&pers_lock);
2604b703
N		 7407 list_for_each_entry(pers, &pers_list, list)
7408 seq_printf(seq, "[%s] ", pers->name);
1da177e4
LT		 7409
7410 spin_unlock(&pers_lock);
7411 seq_printf(seq, "\n");
f1514638 7412 seq->poll_event = atomic_read(&md_event_count);
1da177e4
LT		 7413 return 0;
7414 }
7415 if (v == (void*)2) {
7416 status_unused(seq);
7417 return 0;
7418 }
7419
36d091f4 7420 spin_lock(&mddev->lock);
1da177e4
LT		 7421 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
7422 seq_printf(seq, "%s : %sactive", mdname(mddev),
7423 mddev->pers ? "" : "in");
7424 if (mddev->pers) {
f91de92e 7425 if (mddev->ro==1)
1da177e4 7426 seq_printf(seq, " (read-only)");
f91de92e 7427 if (mddev->ro==2)
52720ae7 7428 seq_printf(seq, " (auto-read-only)");
1da177e4
LT		 7429 seq_printf(seq, " %s", mddev->pers->name);
7430 }
7431
dd8ac336 7432 sectors = 0;
f97fcad3
N		 7433 rcu_read_lock();
7434 rdev_for_each_rcu(rdev, mddev) {
1da177e4
LT		 7435 char b[BDEVNAME_SIZE];
7436 seq_printf(seq, " %s[%d]",
7437 bdevname(rdev->bdev,b), rdev->desc_nr);
8ddf9efe
N		 7438 if (test_bit(WriteMostly, &rdev->flags))
7439 seq_printf(seq, "(W)");
9efdca16
SL		 7440 if (test_bit(Journal, &rdev->flags))
7441 seq_printf(seq, "(J)");
b2d444d7 7442 if (test_bit(Faulty, &rdev->flags)) {
1da177e4
LT		 7443 seq_printf(seq, "(F)");
7444 continue;
2d78f8c4
N		 7445 }
7446 if (rdev->raid_disk < 0)
b325a32e 7447 seq_printf(seq, "(S)"); /* spare */
2d78f8c4
N		 7448 if (test_bit(Replacement, &rdev->flags))
7449 seq_printf(seq, "(R)");
dd8ac336 7450 sectors += rdev->sectors;
1da177e4 7451 }
f97fcad3 7452 rcu_read_unlock();
1da177e4
LT		 7453
7454 if (!list_empty(&mddev->disks)) {
7455 if (mddev->pers)
7456 seq_printf(seq, "\n %llu blocks",
f233ea5c
AN		 7457 (unsigned long long)
7458 mddev->array_sectors / 2);
1da177e4
LT		 7459 else
7460 seq_printf(seq, "\n %llu blocks",
dd8ac336 7461 (unsigned long long)sectors / 2);
1da177e4 7462 }
1cd6bf19
N		 7463 if (mddev->persistent) {
7464 if (mddev->major_version != 0 ||
7465 mddev->minor_version != 90) {
7466 seq_printf(seq," super %d.%d",
7467 mddev->major_version,
7468 mddev->minor_version);
7469 }
e691063a
N		 7470 } else if (mddev->external)
7471 seq_printf(seq, " super external:%s",
7472 mddev->metadata_type);
7473 else
1cd6bf19 7474 seq_printf(seq, " super non-persistent");
1da177e4
LT		 7475
7476 if (mddev->pers) {
d710e138 7477 mddev->pers->status(seq, mddev);
f72ffdd6 7478 seq_printf(seq, "\n ");
8e1b39d6 7479 if (mddev->pers->sync_request) {
f7851be7 7480 if (status_resync(seq, mddev))
8e1b39d6 7481 seq_printf(seq, "\n ");
8e1b39d6 7482 }
32a7627c
N		 7483 } else
7484 seq_printf(seq, "\n ");
7485
57148964 7486 bitmap_status(seq, mddev->bitmap);
1da177e4
LT		 7487
7488 seq_printf(seq, "\n");
7489 }
36d091f4 7490 spin_unlock(&mddev->lock);
f72ffdd6 7491
1da177e4
LT		 7492 return 0;
7493}
7494
110518bc 7495static const struct seq_operations md_seq_ops = {
1da177e4
LT		 7496 .start = md_seq_start,
7497 .next = md_seq_next,
7498 .stop = md_seq_stop,
7499 .show = md_seq_show,
7500};
7501
7502static int md_seq_open(struct inode *inode, struct file *file)
7503{
f1514638 7504 struct seq_file *seq;
1da177e4
LT		 7505 int error;
7506
7507 error = seq_open(file, &md_seq_ops);
d7603b7e 7508 if (error)
f1514638
KS		 7509 return error;
7510
7511 seq = file->private_data;
7512 seq->poll_event = atomic_read(&md_event_count);
1da177e4
LT		 7513 return error;
7514}
7515
e2f23b60 7516static int md_unloading;
d7603b7e
N		 7517static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
7518{
f1514638 7519 struct seq_file *seq = filp->private_data;
d7603b7e
N		 7520 int mask;
7521
e2f23b60 7522 if (md_unloading)
7d7e64f2 7523 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
d7603b7e
N		 7524 poll_wait(filp, &md_event_waiters, wait);
7525
7526 /* always allow read */
7527 mask = POLLIN | POLLRDNORM;
7528
f1514638 7529 if (seq->poll_event != atomic_read(&md_event_count))
d7603b7e
N		 7530 mask |= POLLERR | POLLPRI;
7531 return mask;
7532}
7533
fa027c2a 7534static const struct file_operations md_seq_fops = {
e24650c2 7535 .owner = THIS_MODULE,
1da177e4
LT		 7536 .open = md_seq_open,
7537 .read = seq_read,
7538 .llseek = seq_lseek,
c3f94b40 7539 .release = seq_release_private,
d7603b7e 7540 .poll = mdstat_poll,
1da177e4
LT		 7541};
7542
84fc4b56 7543int register_md_personality(struct md_personality *p)
1da177e4 7544{
50bd3774
CY		 7545 printk(KERN_INFO "md: %s personality registered for level %d\n",
7546 p->name, p->level);
1da177e4 7547 spin_lock(&pers_lock);
2604b703 7548 list_add_tail(&p->list, &pers_list);
1da177e4
LT		 7549 spin_unlock(&pers_lock);
7550 return 0;
7551}
6c144d31 7552EXPORT_SYMBOL(register_md_personality);
1da177e4 7553
84fc4b56 7554int unregister_md_personality(struct md_personality *p)
1da177e4 7555{
2604b703 7556 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
1da177e4 7557 spin_lock(&pers_lock);
2604b703 7558 list_del_init(&p->list);
1da177e4
LT		 7559 spin_unlock(&pers_lock);
7560 return 0;
7561}
6c144d31 7562EXPORT_SYMBOL(unregister_md_personality);
1da177e4 7563
6022e75b
N		 7564int register_md_cluster_operations(struct md_cluster_operations *ops,
7565 struct module *module)
edb39c9d 7566{
6022e75b 7567 int ret = 0;
edb39c9d 7568 spin_lock(&pers_lock);
6022e75b
N		 7569 if (md_cluster_ops != NULL)
7570 ret = -EALREADY;
7571 else {
7572 md_cluster_ops = ops;
7573 md_cluster_mod = module;
7574 }
edb39c9d 7575 spin_unlock(&pers_lock);
6022e75b 7576 return ret;
edb39c9d
GR		 7577}
7578EXPORT_SYMBOL(register_md_cluster_operations);
7579
7580int unregister_md_cluster_operations(void)
7581{
7582 spin_lock(&pers_lock);
7583 md_cluster_ops = NULL;
7584 spin_unlock(&pers_lock);
7585 return 0;
7586}
7587EXPORT_SYMBOL(unregister_md_cluster_operations);
7588
7589int md_setup_cluster(struct mddev *mddev, int nodes)
7590{
7591 int err;
7592
7593 err = request_module("md-cluster");
7594 if (err) {
7595 pr_err("md-cluster module not found.\n");
b0c26a79 7596 return -ENOENT;
edb39c9d
GR		 7597 }
7598
7599 spin_lock(&pers_lock);
7600 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
7601 spin_unlock(&pers_lock);
7602 return -ENOENT;
7603 }
7604 spin_unlock(&pers_lock);
7605
cf921cc1 7606 return md_cluster_ops->join(mddev, nodes);
edb39c9d
GR		 7607}
7608
7609void md_cluster_stop(struct mddev *mddev)
7610{
c4ce867f
GR		 7611 if (!md_cluster_ops)
7612 return;
edb39c9d
GR		 7613 md_cluster_ops->leave(mddev);
7614 module_put(md_cluster_mod);
7615}
7616
fd01b88c 7617static int is_mddev_idle(struct mddev *mddev, int init)
1da177e4 7618{
f72ffdd6 7619 struct md_rdev *rdev;
1da177e4 7620 int idle;
eea1bf38 7621 int curr_events;
1da177e4
LT		 7622
7623 idle = 1;
4b80991c
N		 7624 rcu_read_lock();
7625 rdev_for_each_rcu(rdev, mddev) {
1da177e4 7626 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
eea1bf38
N		 7627 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
7628 (int)part_stat_read(&disk->part0, sectors[1]) -
7629 atomic_read(&disk->sync_io);
713f6ab1
N		 7630 /* sync IO will cause sync_io to increase before the disk_stats
7631 * as sync_io is counted when a request starts, and
7632 * disk_stats is counted when it completes.
7633 * So resync activity will cause curr_events to be smaller than
7634 * when there was no such activity.
7635 * non-sync IO will cause disk_stat to increase without
7636 * increasing sync_io so curr_events will (eventually)
7637 * be larger than it was before. Once it becomes
7638 * substantially larger, the test below will cause
7639 * the array to appear non-idle, and resync will slow
7640 * down.
7641 * If there is a lot of outstanding resync activity when
7642 * we set last_event to curr_events, then all that activity
7643 * completing might cause the array to appear non-idle
7644 * and resync will be slowed down even though there might
7645 * not have been non-resync activity. This will only
7646 * happen once though. 'last_events' will soon reflect
7647 * the state where there is little or no outstanding
7648 * resync requests, and further resync activity will
7649 * always make curr_events less than last_events.
c0e48521 7650 *
1da177e4 7651 */
eea1bf38 7652 if (init || curr_events - rdev->last_events > 64) {
1da177e4
LT		 7653 rdev->last_events = curr_events;
7654 idle = 0;
7655 }
7656 }
4b80991c 7657 rcu_read_unlock();
1da177e4
LT		 7658 return idle;
7659}
7660
fd01b88c 7661void md_done_sync(struct mddev *mddev, int blocks, int ok)
1da177e4
LT		 7662{
7663 /* another "blocks" (512byte) blocks have been synced */
7664 atomic_sub(blocks, &mddev->recovery_active);
7665 wake_up(&mddev->recovery_wait);
7666 if (!ok) {
dfc70645 7667 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
0a19caab 7668 set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
1da177e4
LT		 7669 md_wakeup_thread(mddev->thread);
7670 // stop recovery, signal do_sync ....
7671 }
7672}
6c144d31 7673EXPORT_SYMBOL(md_done_sync);
1da177e4 7674
06d91a5f
N		 7675/* md_write_start(mddev, bi)
7676 * If we need to update some array metadata (e.g. 'active' flag
3d310eb7
N		 7677 * in superblock) before writing, schedule a superblock update
7678 * and wait for it to complete.
06d91a5f 7679 */
fd01b88c 7680void md_write_start(struct mddev *mddev, struct bio *bi)
1da177e4 7681{
0fd62b86 7682 int did_change = 0;
06d91a5f 7683 if (bio_data_dir(bi) != WRITE)
3d310eb7 7684 return;
06d91a5f 7685
f91de92e
N		 7686 BUG_ON(mddev->ro == 1);
7687 if (mddev->ro == 2) {
7688 /* need to switch to read/write */
7689 mddev->ro = 0;
7690 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7691 md_wakeup_thread(mddev->thread);
25156198 7692 md_wakeup_thread(mddev->sync_thread);
0fd62b86 7693 did_change = 1;
f91de92e 7694 }
06d91a5f 7695 atomic_inc(&mddev->writes_pending);
31a59e34
N		 7696 if (mddev->safemode == 1)
7697 mddev->safemode = 0;
06d91a5f 7698 if (mddev->in_sync) {
85572d7c 7699 spin_lock(&mddev->lock);
3d310eb7
N		 7700 if (mddev->in_sync) {
7701 mddev->in_sync = 0;
850b2b42 7702 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
070dc6dd 7703 set_bit(MD_CHANGE_PENDING, &mddev->flags);
3d310eb7 7704 md_wakeup_thread(mddev->thread);
0fd62b86 7705 did_change = 1;
3d310eb7 7706 }
85572d7c 7707 spin_unlock(&mddev->lock);
06d91a5f 7708 }
0fd62b86 7709 if (did_change)
00bcb4ac 7710 sysfs_notify_dirent_safe(mddev->sysfs_state);
09a44cc1 7711 wait_event(mddev->sb_wait,
09a44cc1 7712 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
1da177e4 7713}
6c144d31 7714EXPORT_SYMBOL(md_write_start);
1da177e4 7715
fd01b88c 7716void md_write_end(struct mddev *mddev)
1da177e4
LT		 7717{
7718 if (atomic_dec_and_test(&mddev->writes_pending)) {
7719 if (mddev->safemode == 2)
7720 md_wakeup_thread(mddev->thread);
16f17b39 7721 else if (mddev->safemode_delay)
1da177e4
LT		 7722 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
7723 }
7724}
6c144d31 7725EXPORT_SYMBOL(md_write_end);
1da177e4 7726
2a2275d6
N		 7727/* md_allow_write(mddev)
7728 * Calling this ensures that the array is marked 'active' so that writes
7729 * may proceed without blocking. It is important to call this before
7730 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7731 * Must be called with mddev_lock held.
b5470dc5 7732 *
abf3508d 7733 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
b5470dc5 7734 * is dropped, so return -EAGAIN after notifying userspace.
2a2275d6 7735 */
fd01b88c 7736int md_allow_write(struct mddev *mddev)
2a2275d6
N		 7737{
7738 if (!mddev->pers)
b5470dc5 7739 return 0;
2a2275d6 7740 if (mddev->ro)
b5470dc5 7741 return 0;
1a0fd497 7742 if (!mddev->pers->sync_request)
b5470dc5 7743 return 0;
2a2275d6 7744
85572d7c 7745 spin_lock(&mddev->lock);
2a2275d6
N		 7746 if (mddev->in_sync) {
7747 mddev->in_sync = 0;
7748 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
070dc6dd 7749 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2a2275d6
N		 7750 if (mddev->safemode_delay &&
7751 mddev->safemode == 0)
7752 mddev->safemode = 1;
85572d7c 7753 spin_unlock(&mddev->lock);
2a2275d6 7754 md_update_sb(mddev, 0);
00bcb4ac 7755 sysfs_notify_dirent_safe(mddev->sysfs_state);
2a2275d6 7756 } else
85572d7c 7757 spin_unlock(&mddev->lock);
b5470dc5 7758
070dc6dd 7759 if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
b5470dc5
DW		 7760 return -EAGAIN;
7761 else
7762 return 0;
2a2275d6
N		 7763}
7764EXPORT_SYMBOL_GPL(md_allow_write);
7765
1da177e4
LT		 7766#define SYNC_MARKS 10
7767#define SYNC_MARK_STEP (3*HZ)
54f89341 7768#define UPDATE_FREQUENCY (5*60*HZ)
4ed8731d 7769void md_do_sync(struct md_thread *thread)
1da177e4 7770{
4ed8731d 7771 struct mddev *mddev = thread->mddev;
fd01b88c 7772 struct mddev *mddev2;
1da177e4
LT		 7773 unsigned int currspeed = 0,
7774 window;
ac7e50a3 7775 sector_t max_sectors,j, io_sectors, recovery_done;
1da177e4 7776 unsigned long mark[SYNC_MARKS];
54f89341 7777 unsigned long update_time;
1da177e4
LT		 7778 sector_t mark_cnt[SYNC_MARKS];
7779 int last_mark,m;
7780 struct list_head *tmp;
7781 sector_t last_check;
57afd89f 7782 int skipped = 0;
3cb03002 7783 struct md_rdev *rdev;
c4a39551 7784 char *desc, *action = NULL;
7c2c57c9 7785 struct blk_plug plug;
c186b128 7786 bool cluster_resync_finished = false;
1da177e4
LT		 7787
7788 /* just incase thread restarts... */
7789 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
7790 return;
3991b31e
N		 7791 if (mddev->ro) {/* never try to sync a read-only array */
7792 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5fd6c1dc 7793 return;
3991b31e 7794 }
1da177e4 7795
61df9d91 7796 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
c4a39551 7797 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
61df9d91 7798 desc = "data-check";
c4a39551
JB		 7799 action = "check";
7800 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
61df9d91 7801 desc = "requested-resync";
c4a39551
JB		 7802 action = "repair";
7803 } else
61df9d91
N		 7804 desc = "resync";
7805 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
7806 desc = "reshape";
7807 else
7808 desc = "recovery";
7809
c4a39551
JB		 7810 mddev->last_sync_action = action ?: desc;
7811
1da177e4
LT		 7812 /* we overload curr_resync somewhat here.
7813 * 0 == not engaged in resync at all
7814 * 2 == checking that there is no conflict with another sync
7815 * 1 == like 2, but have yielded to allow conflicting resync to
7816 * commense
7817 * other == active in resync - this many blocks
7818 *
7819 * Before starting a resync we must have set curr_resync to
7820 * 2, and then checked that every "conflicting" array has curr_resync
7821 * less than ours. When we find one that is the same or higher
7822 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7823 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7824 * This will mean we have to start checking from the beginning again.
7825 *
7826 */
7827
7828 do {
7829 mddev->curr_resync = 2;
7830
7831 try_again:
404e4b43 7832 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
1da177e4 7833 goto skip;
29ac4aa3 7834 for_each_mddev(mddev2, tmp) {
1da177e4
LT		 7835 if (mddev2 == mddev)
7836 continue;
90b08710
BS		 7837 if (!mddev->parallel_resync
7838 && mddev2->curr_resync
7839 && match_mddev_units(mddev, mddev2)) {
1da177e4
LT		 7840 DEFINE_WAIT(wq);
7841 if (mddev < mddev2 && mddev->curr_resync == 2) {
7842 /* arbitrarily yield */
7843 mddev->curr_resync = 1;
7844 wake_up(&resync_wait);
7845 }
7846 if (mddev > mddev2 && mddev->curr_resync == 1)
7847 /* no need to wait here, we can wait the next
7848 * time 'round when curr_resync == 2
7849 */
7850 continue;
9744197c
N		 7851 /* We need to wait 'interruptible' so as not to
7852 * contribute to the load average, and not to
7853 * be caught by 'softlockup'
7854 */
7855 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
c91abf5a 7856 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8712e553 7857 mddev2->curr_resync >= mddev->curr_resync) {
61df9d91
N		 7858 printk(KERN_INFO "md: delaying %s of %s"
7859 " until %s has finished (they"
1da177e4 7860 " share one or more physical units)\n",
61df9d91 7861 desc, mdname(mddev), mdname(mddev2));
1da177e4 7862 mddev_put(mddev2);
9744197c
N		 7863 if (signal_pending(current))
7864 flush_signals(current);
1da177e4
LT		 7865 schedule();
7866 finish_wait(&resync_wait, &wq);
7867 goto try_again;
7868 }
7869 finish_wait(&resync_wait, &wq);
7870 }
7871 }
7872 } while (mddev->curr_resync < 2);
7873
5fd6c1dc 7874 j = 0;
9d88883e 7875 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1da177e4 7876 /* resync follows the size requested by the personality,
57afd89f 7877 * which defaults to physical size, but can be virtual size
1da177e4
LT		 7878 */
7879 max_sectors = mddev->resync_max_sectors;
7f7583d4 7880 atomic64_set(&mddev->resync_mismatches, 0);
5fd6c1dc 7881 /* we don't use the checkpoint if there's a bitmap */
5e96ee65
NB		 7882 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
7883 j = mddev->resync_min;
7884 else if (!mddev->bitmap)
5fd6c1dc 7885 j = mddev->recovery_cp;
5e96ee65 7886
ccfcc3c1 7887 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
c804cdec 7888 max_sectors = mddev->resync_max_sectors;
5fd6c1dc 7889 else {
1da177e4 7890 /* recovery follows the physical size of devices */
58c0fed4 7891 max_sectors = mddev->dev_sectors;
5fd6c1dc 7892 j = MaxSector;
4e59ca7d 7893 rcu_read_lock();
dafb20fa 7894 rdev_for_each_rcu(rdev, mddev)
5fd6c1dc 7895 if (rdev->raid_disk >= 0 &&
f2076e7d 7896 !test_bit(Journal, &rdev->flags) &&
5fd6c1dc
N		 7897 !test_bit(Faulty, &rdev->flags) &&
7898 !test_bit(In_sync, &rdev->flags) &&
7899 rdev->recovery_offset < j)
7900 j = rdev->recovery_offset;
4e59ca7d 7901 rcu_read_unlock();
133d4527
N		 7902
7903 /* If there is a bitmap, we need to make sure all
7904 * writes that started before we added a spare
7905 * complete before we start doing a recovery.
7906 * Otherwise the write might complete and (via
7907 * bitmap_endwrite) set a bit in the bitmap after the
7908 * recovery has checked that bit and skipped that
7909 * region.
7910 */
7911 if (mddev->bitmap) {
7912 mddev->pers->quiesce(mddev, 1);
7913 mddev->pers->quiesce(mddev, 0);
7914 }
5fd6c1dc 7915 }
1da177e4 7916
61df9d91
N		 7917 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
7918 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
7919 " %d KB/sec/disk.\n", speed_min(mddev));
338cec32 7920 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
61df9d91
N		 7921 "(but not more than %d KB/sec) for %s.\n",
7922 speed_max(mddev), desc);
1da177e4 7923
eea1bf38 7924 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
5fd6c1dc 7925
57afd89f 7926 io_sectors = 0;
1da177e4
LT		 7927 for (m = 0; m < SYNC_MARKS; m++) {
7928 mark[m] = jiffies;
57afd89f 7929 mark_cnt[m] = io_sectors;
1da177e4
LT		 7930 }
7931 last_mark = 0;
7932 mddev->resync_mark = mark[last_mark];
7933 mddev->resync_mark_cnt = mark_cnt[last_mark];
7934
7935 /*
7936 * Tune reconstruction:
7937 */
7938 window = 32*(PAGE_SIZE/512);
ac42450c
JB		 7939 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
7940 window/2, (unsigned long long)max_sectors/2);
1da177e4
LT		 7941
7942 atomic_set(&mddev->recovery_active, 0);
1da177e4
LT		 7943 last_check = 0;
7944
7945 if (j>2) {
c91abf5a 7946 printk(KERN_INFO
61df9d91
N		 7947 "md: resuming %s of %s from checkpoint.\n",
7948 desc, mdname(mddev));
1da177e4 7949 mddev->curr_resync = j;
72f36d59
N		 7950 } else
7951 mddev->curr_resync = 3; /* no longer delayed */
75d3da43 7952 mddev->curr_resync_completed = j;
72f36d59
N		 7953 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
7954 md_new_event(mddev);
54f89341 7955 update_time = jiffies;
1da177e4 7956
7c2c57c9 7957 blk_start_plug(&plug);
1da177e4 7958 while (j < max_sectors) {
57afd89f 7959 sector_t sectors;
1da177e4 7960
57afd89f 7961 skipped = 0;
97e4f42d 7962
7a91ee1f
N		 7963 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7964 ((mddev->curr_resync > mddev->curr_resync_completed &&
7965 (mddev->curr_resync - mddev->curr_resync_completed)
7966 > (max_sectors >> 4)) ||
54f89341 7967 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
7a91ee1f 7968 (j - mddev->curr_resync_completed)*2
c5e19d90
N		 7969 >= mddev->resync_max - mddev->curr_resync_completed ||
7970 mddev->curr_resync_completed > mddev->resync_max
7a91ee1f 7971 )) {
97e4f42d 7972 /* time to update curr_resync_completed */
97e4f42d
N		 7973 wait_event(mddev->recovery_wait,
7974 atomic_read(&mddev->recovery_active) == 0);
75d3da43 7975 mddev->curr_resync_completed = j;
35d78c66 7976 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
7977 j > mddev->recovery_cp)
7978 mddev->recovery_cp = j;
54f89341 7979 update_time = jiffies;
070dc6dd 7980 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
acb180b0 7981 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
97e4f42d 7982 }
acb180b0 7983
c91abf5a
N		 7984 while (j >= mddev->resync_max &&
7985 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
e62e58a5
N		 7986 /* As this condition is controlled by user-space,
7987 * we can block indefinitely, so use '_interruptible'
7988 * to avoid triggering warnings.
7989 */
7990 flush_signals(current); /* just in case */
7991 wait_event_interruptible(mddev->recovery_wait,
7992 mddev->resync_max > j
c91abf5a
N		 7993 || test_bit(MD_RECOVERY_INTR,
7994 &mddev->recovery));
e62e58a5 7995 }
acb180b0 7996
c91abf5a
N		 7997 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
7998 break;
acb180b0 7999
09314799 8000 sectors = mddev->pers->sync_request(mddev, j, &skipped);
57afd89f 8001 if (sectors == 0) {
dfc70645 8002 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
c91abf5a 8003 break;
1da177e4 8004 }
57afd89f
N		 8005
8006 if (!skipped) { /* actual IO requested */
8007 io_sectors += sectors;
8008 atomic_add(sectors, &mddev->recovery_active);
8009 }
8010
e875ecea
N		 8011 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8012 break;
8013
1da177e4 8014 j += sectors;
5ed1df2e
N		 8015 if (j > max_sectors)
8016 /* when skipping, extra large numbers can be returned. */
8017 j = max_sectors;
72f36d59
N		 8018 if (j > 2)
8019 mddev->curr_resync = j;
ff4e8d9a 8020 mddev->curr_mark_cnt = io_sectors;
d7603b7e 8021 if (last_check == 0)
e875ecea 8022 /* this is the earliest that rebuild will be
d7603b7e
N		 8023 * visible in /proc/mdstat
8024 */
8025 md_new_event(mddev);
57afd89f
N		 8026
8027 if (last_check + window > io_sectors || j == max_sectors)
1da177e4
LT		 8028 continue;
8029
57afd89f 8030 last_check = io_sectors;
1da177e4
LT		 8031 repeat:
8032 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
8033 /* step marks */
8034 int next = (last_mark+1) % SYNC_MARKS;
8035
8036 mddev->resync_mark = mark[next];
8037 mddev->resync_mark_cnt = mark_cnt[next];
8038 mark[next] = jiffies;
57afd89f 8039 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
1da177e4
LT		 8040 last_mark = next;
8041 }
8042
c91abf5a
N		 8043 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8044 break;
1da177e4
LT		 8045
8046 /*
8047 * this loop exits only if either when we are slower than
8048 * the 'hard' speed limit, or the system was IO-idle for
8049 * a jiffy.
8050 * the system might be non-idle CPU-wise, but we only care
8051 * about not overloading the IO subsystem. (things like an
8052 * e2fsck being done on the RAID array should execute fast)
8053 */
1da177e4
LT		 8054 cond_resched();
8055
ac7e50a3
XN		 8056 recovery_done = io_sectors - atomic_read(&mddev->recovery_active);
8057 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2
57afd89f 8058 /((jiffies-mddev->resync_mark)/HZ +1) +1;
1da177e4 8059
88202a0c 8060 if (currspeed > speed_min(mddev)) {
ac8fa419 8061 if (currspeed > speed_max(mddev)) {
c0e48521 8062 msleep(500);
1da177e4
LT		 8063 goto repeat;
8064 }
ac8fa419
N		 8065 if (!is_mddev_idle(mddev, 0)) {
8066 /*
8067 * Give other IO more of a chance.
8068 * The faster the devices, the less we wait.
8069 */
8070 wait_event(mddev->recovery_wait,
8071 !atomic_read(&mddev->recovery_active));
8072 }
1da177e4
LT		 8073 }
8074 }
c91abf5a
N		 8075 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc,
8076 test_bit(MD_RECOVERY_INTR, &mddev->recovery)
8077 ? "interrupted" : "done");
1da177e4
LT		 8078 /*
8079 * this also signals 'finished resyncing' to md_stop
8080 */
7c2c57c9 8081 blk_finish_plug(&plug);
1da177e4
LT		 8082 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
8083
5ed1df2e
N		 8084 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8085 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8086 mddev->curr_resync > 2) {
8087 mddev->curr_resync_completed = mddev->curr_resync;
8088 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
8089 }
c186b128
GR		 8090 /* tell personality and other nodes that we are finished */
8091 if (mddev_is_clustered(mddev)) {
8092 md_cluster_ops->resync_finish(mddev);
8093 cluster_resync_finished = true;
8094 }
09314799 8095 mddev->pers->sync_request(mddev, max_sectors, &skipped);
1da177e4 8096
dfc70645 8097 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5fd6c1dc
N		 8098 mddev->curr_resync > 2) {
8099 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
8100 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8101 if (mddev->curr_resync >= mddev->recovery_cp) {
8102 printk(KERN_INFO
61df9d91
N		 8103 "md: checkpointing %s of %s.\n",
8104 desc, mdname(mddev));
0a19caab 8105 if (test_bit(MD_RECOVERY_ERROR,
8106 &mddev->recovery))
8107 mddev->recovery_cp =
8108 mddev->curr_resync_completed;
8109 else
8110 mddev->recovery_cp =
8111 mddev->curr_resync;
5fd6c1dc
N		 8112 }
8113 } else
8114 mddev->recovery_cp = MaxSector;
8115 } else {
8116 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
8117 mddev->curr_resync = MaxSector;
4e59ca7d 8118 rcu_read_lock();
dafb20fa 8119 rdev_for_each_rcu(rdev, mddev)
5fd6c1dc 8120 if (rdev->raid_disk >= 0 &&
70fffd0b 8121 mddev->delta_disks >= 0 &&
f2076e7d 8122 !test_bit(Journal, &rdev->flags) &&
5fd6c1dc
N		 8123 !test_bit(Faulty, &rdev->flags) &&
8124 !test_bit(In_sync, &rdev->flags) &&
8125 rdev->recovery_offset < mddev->curr_resync)
8126 rdev->recovery_offset = mddev->curr_resync;
4e59ca7d 8127 rcu_read_unlock();
5fd6c1dc 8128 }
1da177e4 8129 }
db91ff55 8130 skip:
17571284 8131 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1da177e4 8132
c186b128
GR		 8133 if (mddev_is_clustered(mddev) &&
8134 test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8135 !cluster_resync_finished)
8136 md_cluster_ops->resync_finish(mddev);
8137
23da422b 8138 spin_lock(&mddev->lock);
c07b70ad
N		 8139 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
8140 /* We completed so min/max setting can be forgotten if used. */
8141 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8142 mddev->resync_min = 0;
8143 mddev->resync_max = MaxSector;
8144 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
8145 mddev->resync_min = mddev->curr_resync_completed;
f7851be7 8146 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 8147 mddev->curr_resync = 0;
23da422b
N		 8148 spin_unlock(&mddev->lock);
8149
1da177e4 8150 wake_up(&resync_wait);
1da177e4 8151 md_wakeup_thread(mddev->thread);
c6207277 8152 return;
1da177e4 8153}
29269553 8154EXPORT_SYMBOL_GPL(md_do_sync);
1da177e4 8155
746d3207
N		 8156static int remove_and_add_spares(struct mddev *mddev,
8157 struct md_rdev *this)
b4c4c7b8 8158{
3cb03002 8159 struct md_rdev *rdev;
b4c4c7b8 8160 int spares = 0;
f2a371c5 8161 int removed = 0;
b4c4c7b8 8162
dafb20fa 8163 rdev_for_each(rdev, mddev)
746d3207
N		 8164 if ((this == NULL || rdev == this) &&
8165 rdev->raid_disk >= 0 &&
6bfe0b49 8166 !test_bit(Blocked, &rdev->flags) &&
b4c4c7b8 8167 (test_bit(Faulty, &rdev->flags) ||
f2076e7d
SL		 8168 (!test_bit(In_sync, &rdev->flags) &&
8169 !test_bit(Journal, &rdev->flags))) &&
b4c4c7b8
N		 8170 atomic_read(&rdev->nr_pending)==0) {
8171 if (mddev->pers->hot_remove_disk(
b8321b68 8172 mddev, rdev) == 0) {
36fad858 8173 sysfs_unlink_rdev(mddev, rdev);
b4c4c7b8 8174 rdev->raid_disk = -1;
f2a371c5 8175 removed++;
b4c4c7b8
N		 8176 }
8177 }
90584fc9
JB		 8178 if (removed && mddev->kobj.sd)
8179 sysfs_notify(&mddev->kobj, NULL, "degraded");
b4c4c7b8 8180
2910ff17 8181 if (this && removed)
746d3207
N		 8182 goto no_add;
8183
dafb20fa 8184 rdev_for_each(rdev, mddev) {
2910ff17
GR		 8185 if (this && this != rdev)
8186 continue;
dbb64f86
GR		 8187 if (test_bit(Candidate, &rdev->flags))
8188 continue;
7bfec5f3
N		 8189 if (rdev->raid_disk >= 0 &&
8190 !test_bit(In_sync, &rdev->flags) &&
f2076e7d 8191 !test_bit(Journal, &rdev->flags) &&
7bfec5f3
N		 8192 !test_bit(Faulty, &rdev->flags))
8193 spares++;
7ceb17e8
N		 8194 if (rdev->raid_disk >= 0)
8195 continue;
8196 if (test_bit(Faulty, &rdev->flags))
8197 continue;
f6b6ec5c
SL		 8198 if (!test_bit(Journal, &rdev->flags)) {
8199 if (mddev->ro &&
8200 ! (rdev->saved_raid_disk >= 0 &&
8201 !test_bit(Bitmap_sync, &rdev->flags)))
8202 continue;
7ceb17e8 8203
f6b6ec5c
SL		 8204 rdev->recovery_offset = 0;
8205 }
7ceb17e8
N		 8206 if (mddev->pers->
8207 hot_add_disk(mddev, rdev) == 0) {
8208 if (sysfs_link_rdev(mddev, rdev))
8209 /* failure here is OK */;
f6b6ec5c
SL		 8210 if (!test_bit(Journal, &rdev->flags))
8211 spares++;
7ceb17e8
N		 8212 md_new_event(mddev);
8213 set_bit(MD_CHANGE_DEVS, &mddev->flags);
dfc70645 8214 }
b4c4c7b8 8215 }
746d3207 8216no_add:
6dafab6b
N		 8217 if (removed)
8218 set_bit(MD_CHANGE_DEVS, &mddev->flags);
b4c4c7b8
N		 8219 return spares;
8220}
7ebc0be7 8221
ac05f256
N		 8222static void md_start_sync(struct work_struct *ws)
8223{
8224 struct mddev *mddev = container_of(ws, struct mddev, del_work);
c186b128
GR		 8225 int ret = 0;
8226
8227 if (mddev_is_clustered(mddev)) {
8228 ret = md_cluster_ops->resync_start(mddev);
8229 if (ret) {
8230 mddev->sync_thread = NULL;
8231 goto out;
8232 }
8233 }
ac05f256
N		 8234
8235 mddev->sync_thread = md_register_thread(md_do_sync,
8236 mddev,
8237 "resync");
c186b128 8238out:
ac05f256 8239 if (!mddev->sync_thread) {
c186b128
GR		 8240 if (!(mddev_is_clustered(mddev) && ret == -EAGAIN))
8241 printk(KERN_ERR "%s: could not start resync"
8242 " thread...\n",
8243 mdname(mddev));
ac05f256
N		 8244 /* leave the spares where they are, it shouldn't hurt */
8245 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8246 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8247 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8248 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
8249 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
f851b60d 8250 wake_up(&resync_wait);
ac05f256
N		 8251 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8252 &mddev->recovery))
8253 if (mddev->sysfs_action)
8254 sysfs_notify_dirent_safe(mddev->sysfs_action);
8255 } else
8256 md_wakeup_thread(mddev->sync_thread);
8257 sysfs_notify_dirent_safe(mddev->sysfs_action);
8258 md_new_event(mddev);
8259}
8260
1da177e4
LT		 8261/*
8262 * This routine is regularly called by all per-raid-array threads to
8263 * deal with generic issues like resync and super-block update.
8264 * Raid personalities that don't have a thread (linear/raid0) do not
8265 * need this as they never do any recovery or update the superblock.
8266 *
8267 * It does not do any resync itself, but rather "forks" off other threads
8268 * to do that as needed.
8269 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8270 * "->recovery" and create a thread at ->sync_thread.
dfc70645 8271 * When the thread finishes it sets MD_RECOVERY_DONE
1da177e4
LT		 8272 * and wakeups up this thread which will reap the thread and finish up.
8273 * This thread also removes any faulty devices (with nr_pending == 0).
8274 *
8275 * The overall approach is:
8276 * 1/ if the superblock needs updating, update it.
8277 * 2/ If a recovery thread is running, don't do anything else.
8278 * 3/ If recovery has finished, clean up, possibly marking spares active.
8279 * 4/ If there are any faulty devices, remove them.
8280 * 5/ If array is degraded, try to add spares devices
8281 * 6/ If array has spares or is not in-sync, start a resync thread.
8282 */
fd01b88c 8283void md_check_recovery(struct mddev *mddev)
1da177e4 8284{
68866e42
JB		 8285 if (mddev->suspended)
8286 return;
8287
5f40402d 8288 if (mddev->bitmap)
aa5cbd10 8289 bitmap_daemon_work(mddev);
1da177e4 8290
fca4d848 8291 if (signal_pending(current)) {
31a59e34 8292 if (mddev->pers->sync_request && !mddev->external) {
fca4d848
N		 8293 printk(KERN_INFO "md: %s in immediate safe mode\n",
8294 mdname(mddev));
8295 mddev->safemode = 2;
8296 }
8297 flush_signals(current);
8298 }
8299
c89a8eee
N		 8300 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
8301 return;
1da177e4 8302 if ( ! (
142d44c3 8303 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
1da177e4 8304 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
fca4d848 8305 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
15858fa5 8306 test_bit(MD_RELOAD_SB, &mddev->flags) ||
31a59e34 8307 (mddev->external == 0 && mddev->safemode == 1) ||
fca4d848
N		 8308 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
8309 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
1da177e4
LT		 8310 ))
8311 return;
fca4d848 8312
df5b89b3 8313 if (mddev_trylock(mddev)) {
b4c4c7b8 8314 int spares = 0;
fca4d848 8315
c89a8eee 8316 if (mddev->ro) {
ab16bfc7
NB		 8317 struct md_rdev *rdev;
8318 if (!mddev->external && mddev->in_sync)
8319 /* 'Blocked' flag not needed as failed devices
8320 * will be recorded if array switched to read/write.
8321 * Leaving it set will prevent the device
8322 * from being removed.
8323 */
8324 rdev_for_each(rdev, mddev)
8325 clear_bit(Blocked, &rdev->flags);
7ceb17e8
N		 8326 /* On a read-only array we can:
8327 * - remove failed devices
8328 * - add already-in_sync devices if the array itself
8329 * is in-sync.
8330 * As we only add devices that are already in-sync,
8331 * we can activate the spares immediately.
c89a8eee 8332 */
7ceb17e8 8333 remove_and_add_spares(mddev, NULL);
8313b8e5
N		 8334 /* There is no thread, but we need to call
8335 * ->spare_active and clear saved_raid_disk
8336 */
2ac295a5 8337 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
8313b8e5 8338 md_reap_sync_thread(mddev);
a4a3d26d 8339 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
8313b8e5 8340 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
d4929add 8341 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
c89a8eee
N		 8342 goto unlock;
8343 }
8344
659b254f
GJ		 8345 if (mddev_is_clustered(mddev)) {
8346 struct md_rdev *rdev;
8347 /* kick the device if another node issued a
8348 * remove disk.
8349 */
8350 rdev_for_each(rdev, mddev) {
8351 if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
8352 rdev->raid_disk < 0)
8353 md_kick_rdev_from_array(rdev);
8354 }
15858fa5
GJ		 8355
8356 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
8357 md_reload_sb(mddev, mddev->good_device_nr);
659b254f
GJ		 8358 }
8359
31a59e34 8360 if (!mddev->external) {
0fd62b86 8361 int did_change = 0;
85572d7c 8362 spin_lock(&mddev->lock);
31a59e34
N		 8363 if (mddev->safemode &&
8364 !atomic_read(&mddev->writes_pending) &&
8365 !mddev->in_sync &&
8366 mddev->recovery_cp == MaxSector) {
8367 mddev->in_sync = 1;
0fd62b86 8368 did_change = 1;
070dc6dd 8369 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
31a59e34
N		 8370 }
8371 if (mddev->safemode == 1)
8372 mddev->safemode = 0;
85572d7c 8373 spin_unlock(&mddev->lock);
0fd62b86 8374 if (did_change)
00bcb4ac 8375 sysfs_notify_dirent_safe(mddev->sysfs_state);
fca4d848 8376 }
fca4d848 8377
2aa82191 8378 if (mddev->flags & MD_UPDATE_SB_FLAGS)
850b2b42 8379 md_update_sb(mddev, 0);
06d91a5f 8380
1da177e4
LT		 8381 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
8382 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
8383 /* resync/recovery still happening */
8384 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8385 goto unlock;
8386 }
8387 if (mddev->sync_thread) {
a91d5ac0 8388 md_reap_sync_thread(mddev);
1da177e4
LT		 8389 goto unlock;
8390 }
72a23c21
NB		 8391 /* Set RUNNING before clearing NEEDED to avoid
8392 * any transients in the value of "sync_action".
8393 */
72f36d59 8394 mddev->curr_resync_completed = 0;
23da422b 8395 spin_lock(&mddev->lock);
72a23c21 8396 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
23da422b 8397 spin_unlock(&mddev->lock);
24dd469d
N		 8398 /* Clear some bits that don't mean anything, but
8399 * might be left set
8400 */
24dd469d
N		 8401 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
8402 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
1da177e4 8403
ed209584
N		 8404 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
8405 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
ac05f256 8406 goto not_running;
1da177e4
LT		 8407 /* no recovery is running.
8408 * remove any failed drives, then
8409 * add spares if possible.
72f36d59 8410 * Spares are also removed and re-added, to allow
1da177e4
LT		 8411 * the personality to fail the re-add.
8412 */
1da177e4 8413
b4c4c7b8 8414 if (mddev->reshape_position != MaxSector) {
50ac168a
N		 8415 if (mddev->pers->check_reshape == NULL ||
8416 mddev->pers->check_reshape(mddev) != 0)
b4c4c7b8 8417 /* Cannot proceed */
ac05f256 8418 goto not_running;
b4c4c7b8 8419 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
72a23c21 8420 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
746d3207 8421 } else if ((spares = remove_and_add_spares(mddev, NULL))) {
24dd469d
N		 8422 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8423 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
56ac36d7 8424 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
72a23c21 8425 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
24dd469d
N		 8426 } else if (mddev->recovery_cp < MaxSector) {
8427 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
72a23c21 8428 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
24dd469d
N		 8429 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
8430 /* nothing to be done ... */
ac05f256 8431 goto not_running;
24dd469d 8432
1da177e4 8433 if (mddev->pers->sync_request) {
ef99bf48 8434 if (spares) {
a654b9d8
N		 8435 /* We are adding a device or devices to an array
8436 * which has the bitmap stored on all devices.
8437 * So make sure all bitmap pages get written
8438 */
8439 bitmap_write_all(mddev->bitmap);
8440 }
ac05f256
N		 8441 INIT_WORK(&mddev->del_work, md_start_sync);
8442 queue_work(md_misc_wq, &mddev->del_work);
8443 goto unlock;
1da177e4 8444 }
ac05f256 8445 not_running:
72a23c21
NB		 8446 if (!mddev->sync_thread) {
8447 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
f851b60d 8448 wake_up(&resync_wait);
72a23c21
NB		 8449 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
8450 &mddev->recovery))
0c3573f1 8451 if (mddev->sysfs_action)
00bcb4ac 8452 sysfs_notify_dirent_safe(mddev->sysfs_action);
72a23c21 8453 }
ac05f256
N		 8454 unlock:
8455 wake_up(&mddev->sb_wait);
1da177e4
LT		 8456 mddev_unlock(mddev);
8457 }
8458}
6c144d31 8459EXPORT_SYMBOL(md_check_recovery);
1da177e4 8460
a91d5ac0
JB		 8461void md_reap_sync_thread(struct mddev *mddev)
8462{
8463 struct md_rdev *rdev;
8464
8465 /* resync has finished, collect result */
8466 md_unregister_thread(&mddev->sync_thread);
8467 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
8468 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
8469 /* success...*/
8470 /* activate any spares */
8471 if (mddev->pers->spare_active(mddev)) {
8472 sysfs_notify(&mddev->kobj, NULL,
8473 "degraded");
8474 set_bit(MD_CHANGE_DEVS, &mddev->flags);
8475 }
8476 }
8477 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
8478 mddev->pers->finish_reshape)
8479 mddev->pers->finish_reshape(mddev);
8480
8481 /* If array is no-longer degraded, then any saved_raid_disk
f466722c 8482 * information must be scrapped.
a91d5ac0 8483 */
f466722c
N		 8484 if (!mddev->degraded)
8485 rdev_for_each(rdev, mddev)
a91d5ac0
JB		 8486 rdev->saved_raid_disk = -1;
8487
8488 md_update_sb(mddev, 1);
8489 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
ea358cd0 8490 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
a91d5ac0
JB		 8491 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
8492 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
8493 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
8494 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
f851b60d 8495 wake_up(&resync_wait);
a91d5ac0
JB		 8496 /* flag recovery needed just to double check */
8497 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
8498 sysfs_notify_dirent_safe(mddev->sysfs_action);
8499 md_new_event(mddev);
8500 if (mddev->event_work.func)
8501 queue_work(md_misc_wq, &mddev->event_work);
8502}
6c144d31 8503EXPORT_SYMBOL(md_reap_sync_thread);
a91d5ac0 8504
fd01b88c 8505void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
6bfe0b49 8506{
00bcb4ac 8507 sysfs_notify_dirent_safe(rdev->sysfs_state);
6bfe0b49 8508 wait_event_timeout(rdev->blocked_wait,
de393cde
N		 8509 !test_bit(Blocked, &rdev->flags) &&
8510 !test_bit(BlockedBadBlocks, &rdev->flags),
6bfe0b49
DW		 8511 msecs_to_jiffies(5000));
8512 rdev_dec_pending(rdev, mddev);
8513}
8514EXPORT_SYMBOL(md_wait_for_blocked_rdev);
8515
c6563a8c
N		 8516void md_finish_reshape(struct mddev *mddev)
8517{
8518 /* called be personality module when reshape completes. */
8519 struct md_rdev *rdev;
8520
8521 rdev_for_each(rdev, mddev) {
8522 if (rdev->data_offset > rdev->new_data_offset)
8523 rdev->sectors += rdev->data_offset - rdev->new_data_offset;
8524 else
8525 rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
8526 rdev->data_offset = rdev->new_data_offset;
8527 }
8528}
8529EXPORT_SYMBOL(md_finish_reshape);
2230dfe4 8530
fc974ee2 8531/* Bad block management */
2230dfe4 8532
fc974ee2 8533/* Returns 1 on success, 0 on failure */
3cb03002 8534int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
c6563a8c 8535 int is_new)
2230dfe4 8536{
c6563a8c
N		 8537 int rv;
8538 if (is_new)
8539 s += rdev->new_data_offset;
8540 else
8541 s += rdev->data_offset;
fc974ee2
VV		 8542 rv = badblocks_set(&rdev->badblocks, s, sectors, 0);
8543 if (rv == 0) {
2230dfe4 8544 /* Make sure they get written out promptly */
8bd2f0a0 8545 sysfs_notify_dirent_safe(rdev->sysfs_state);
2230dfe4 8546 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
55ce74d4 8547 set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags);
2230dfe4 8548 md_wakeup_thread(rdev->mddev->thread);
fc974ee2
VV		 8549 return 1;
8550 } else
8551 return 0;
2230dfe4
N		 8552}
8553EXPORT_SYMBOL_GPL(rdev_set_badblocks);
8554
c6563a8c
N		 8555int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
8556 int is_new)
2230dfe4 8557{
c6563a8c
N		 8558 if (is_new)
8559 s += rdev->new_data_offset;
8560 else
8561 s += rdev->data_offset;
fc974ee2 8562 return badblocks_clear(&rdev->badblocks,
c6563a8c 8563 s, sectors);
2230dfe4
N		 8564}
8565EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
8566
75c96f85
AB		 8567static int md_notify_reboot(struct notifier_block *this,
8568 unsigned long code, void *x)
1da177e4
LT		 8569{
8570 struct list_head *tmp;
fd01b88c 8571 struct mddev *mddev;
2dba6a91 8572 int need_delay = 0;
1da177e4 8573
c744a65c
N		 8574 for_each_mddev(mddev, tmp) {
8575 if (mddev_trylock(mddev)) {
30b8aa91
N		 8576 if (mddev->pers)
8577 __md_stop_writes(mddev);
0f62fb22
N		 8578 if (mddev->persistent)
8579 mddev->safemode = 2;
c744a65c 8580 mddev_unlock(mddev);
2dba6a91 8581 }
c744a65c 8582 need_delay = 1;
1da177e4 8583 }
c744a65c
N		 8584 /*
8585 * certain more exotic SCSI devices are known to be
8586 * volatile wrt too early system reboots. While the
8587 * right place to handle this issue is the given
8588 * driver, we do want to have a safe RAID driver ...
8589 */
8590 if (need_delay)
8591 mdelay(1000*1);
8592
1da177e4
LT		 8593 return NOTIFY_DONE;
8594}
8595
75c96f85 8596static struct notifier_block md_notifier = {
1da177e4
LT		 8597 .notifier_call = md_notify_reboot,
8598 .next = NULL,
8599 .priority = INT_MAX, /* before any real devices */
8600};
8601
8602static void md_geninit(void)
8603{
36a4e1fe 8604 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
1da177e4 8605
c7705f34 8606 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
1da177e4
LT		 8607}
8608
75c96f85 8609static int __init md_init(void)
1da177e4 8610{
e804ac78
TH		 8611 int ret = -ENOMEM;
8612
ada609ee 8613 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
e804ac78
TH		 8614 if (!md_wq)
8615 goto err_wq;
8616
8617 md_misc_wq = alloc_workqueue("md_misc", 0, 0);
8618 if (!md_misc_wq)
8619 goto err_misc_wq;
8620
8621 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
8622 goto err_md;
8623
8624 if ((ret = register_blkdev(0, "mdp")) < 0)
8625 goto err_mdp;
8626 mdp_major = ret;
8627
af5628f0 8628 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE,
e8703fe1
N		 8629 md_probe, NULL, NULL);
8630 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
1da177e4
LT		 8631 md_probe, NULL, NULL);
8632
1da177e4 8633 register_reboot_notifier(&md_notifier);
0b4d4147 8634 raid_table_header = register_sysctl_table(raid_root_table);
1da177e4
LT		 8635
8636 md_geninit();
d710e138 8637 return 0;
1da177e4 8638
e804ac78
TH		 8639err_mdp:
8640 unregister_blkdev(MD_MAJOR, "md");
8641err_md:
8642 destroy_workqueue(md_misc_wq);
8643err_misc_wq:
8644 destroy_workqueue(md_wq);
8645err_wq:
8646 return ret;
8647}
1da177e4 8648
70bcecdb 8649static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
1d7e3e96 8650{
70bcecdb
GR		 8651 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
8652 struct md_rdev *rdev2;
8653 int role, ret;
8654 char b[BDEVNAME_SIZE];
1d7e3e96 8655
70bcecdb
GR		 8656 /* Check for change of roles in the active devices */
8657 rdev_for_each(rdev2, mddev) {
8658 if (test_bit(Faulty, &rdev2->flags))
8659 continue;
8660
8661 /* Check if the roles changed */
8662 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
dbb64f86
GR		 8663
8664 if (test_bit(Candidate, &rdev2->flags)) {
8665 if (role == 0xfffe) {
8666 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
8667 md_kick_rdev_from_array(rdev2);
8668 continue;
8669 }
8670 else
8671 clear_bit(Candidate, &rdev2->flags);
8672 }
8673
70bcecdb
GR		 8674 if (role != rdev2->raid_disk) {
8675 /* got activated */
8676 if (rdev2->raid_disk == -1 && role != 0xffff) {
8677 rdev2->saved_raid_disk = role;
8678 ret = remove_and_add_spares(mddev, rdev2);
8679 pr_info("Activated spare: %s\n",
8680 bdevname(rdev2->bdev,b));
70bcecdb
GR		 8681 }
8682 /* device faulty
8683 * We just want to do the minimum to mark the disk
8684 * as faulty. The recovery is performed by the
8685 * one who initiated the error.
8686 */
8687 if ((role == 0xfffe) || (role == 0xfffd)) {
8688 md_error(mddev, rdev2);
8689 clear_bit(Blocked, &rdev2->flags);
8690 }
8691 }
1d7e3e96 8692 }
70bcecdb 8693
28c1b9fd
GR		 8694 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks))
8695 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks));
70bcecdb
GR		 8696
8697 /* Finally set the event to be up to date */
8698 mddev->events = le64_to_cpu(sb->events);
8699}
8700
8701static int read_rdev(struct mddev *mddev, struct md_rdev *rdev)
8702{
8703 int err;
8704 struct page *swapout = rdev->sb_page;
8705 struct mdp_superblock_1 *sb;
8706
8707 /* Store the sb page of the rdev in the swapout temporary
8708 * variable in case we err in the future
8709 */
8710 rdev->sb_page = NULL;
8711 alloc_disk_sb(rdev);
8712 ClearPageUptodate(rdev->sb_page);
8713 rdev->sb_loaded = 0;
8714 err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version);
8715
8716 if (err < 0) {
8717 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8718 __func__, __LINE__, rdev->desc_nr, err);
8719 put_page(rdev->sb_page);
8720 rdev->sb_page = swapout;
8721 rdev->sb_loaded = 1;
8722 return err;
1d7e3e96
GR		 8723 }
8724
70bcecdb
GR		 8725 sb = page_address(rdev->sb_page);
8726 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8727 * is not set
8728 */
8729
8730 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET))
8731 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
8732
8733 /* The other node finished recovery, call spare_active to set
8734 * device In_sync and mddev->degraded
8735 */
8736 if (rdev->recovery_offset == MaxSector &&
8737 !test_bit(In_sync, &rdev->flags) &&
8738 mddev->pers->spare_active(mddev))
8739 sysfs_notify(&mddev->kobj, NULL, "degraded");
8740
8741 put_page(swapout);
8742 return 0;
8743}
8744
8745void md_reload_sb(struct mddev *mddev, int nr)
8746{
8747 struct md_rdev *rdev;
8748 int err;
8749
8750 /* Find the rdev */
8751 rdev_for_each_rcu(rdev, mddev) {
8752 if (rdev->desc_nr == nr)
8753 break;
8754 }
8755
8756 if (!rdev || rdev->desc_nr != nr) {
8757 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr);
8758 return;
8759 }
8760
8761 err = read_rdev(mddev, rdev);
8762 if (err < 0)
8763 return;
8764
8765 check_sb_changes(mddev, rdev);
8766
8767 /* Read all rdev's to update recovery_offset */
8768 rdev_for_each_rcu(rdev, mddev)
8769 read_rdev(mddev, rdev);
1d7e3e96
GR		 8770}
8771EXPORT_SYMBOL(md_reload_sb);
8772
1da177e4
LT		 8773#ifndef MODULE
8774
8775/*
8776 * Searches all registered partitions for autorun RAID arrays
8777 * at boot time.
8778 */
4d936ec1
ME		 8779
8780static LIST_HEAD(all_detected_devices);
8781struct detected_devices_node {
8782 struct list_head list;
8783 dev_t dev;
8784};
1da177e4
LT		 8785
8786void md_autodetect_dev(dev_t dev)
8787{
4d936ec1
ME		 8788 struct detected_devices_node *node_detected_dev;
8789
8790 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
8791 if (node_detected_dev) {
8792 node_detected_dev->dev = dev;
8793 list_add_tail(&node_detected_dev->list, &all_detected_devices);
8794 } else {
8795 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
8796 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
8797 }
1da177e4
LT		 8798}
8799
1da177e4
LT		 8800static void autostart_arrays(int part)
8801{
3cb03002 8802 struct md_rdev *rdev;
4d936ec1
ME		 8803 struct detected_devices_node *node_detected_dev;
8804 dev_t dev;
8805 int i_scanned, i_passed;
1da177e4 8806
4d936ec1
ME		 8807 i_scanned = 0;
8808 i_passed = 0;
1da177e4 8809
4d936ec1 8810 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
1da177e4 8811
4d936ec1
ME		 8812 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
8813 i_scanned++;
8814 node_detected_dev = list_entry(all_detected_devices.next,
8815 struct detected_devices_node, list);
8816 list_del(&node_detected_dev->list);
8817 dev = node_detected_dev->dev;
8818 kfree(node_detected_dev);
df968c4e 8819 rdev = md_import_device(dev,0, 90);
1da177e4
LT		 8820 if (IS_ERR(rdev))
8821 continue;
8822
403df478 8823 if (test_bit(Faulty, &rdev->flags))
1da177e4 8824 continue;
403df478 8825
d0fae18f 8826 set_bit(AutoDetected, &rdev->flags);
1da177e4 8827 list_add(&rdev->same_set, &pending_raid_disks);
4d936ec1 8828 i_passed++;
1da177e4 8829 }
4d936ec1
ME		 8830
8831 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
8832 i_scanned, i_passed);
1da177e4
LT		 8833
8834 autorun_devices(part);
8835}
8836
fdee8ae4 8837#endif /* !MODULE */
1da177e4
LT		 8838
8839static __exit void md_exit(void)
8840{
fd01b88c 8841 struct mddev *mddev;
1da177e4 8842 struct list_head *tmp;
e2f23b60 8843 int delay = 1;
8ab5e4c1 8844
af5628f0 8845 blk_unregister_region(MKDEV(MD_MAJOR,0), 512);
e8703fe1 8846 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
1da177e4 8847
3dbd8c2e 8848 unregister_blkdev(MD_MAJOR,"md");
1da177e4
LT		 8849 unregister_blkdev(mdp_major, "mdp");
8850 unregister_reboot_notifier(&md_notifier);
8851 unregister_sysctl_table(raid_table_header);
e2f23b60
N		 8852
8853 /* We cannot unload the modules while some process is
8854 * waiting for us in select() or poll() - wake them up
8855 */
8856 md_unloading = 1;
8857 while (waitqueue_active(&md_event_waiters)) {
8858 /* not safe to leave yet */
8859 wake_up(&md_event_waiters);
8860 msleep(delay);
8861 delay += delay;
8862 }
1da177e4 8863 remove_proc_entry("mdstat", NULL);
e2f23b60 8864
29ac4aa3 8865 for_each_mddev(mddev, tmp) {
1da177e4 8866 export_array(mddev);
d3374825 8867 mddev->hold_active = 0;
1da177e4 8868 }
e804ac78
TH		 8869 destroy_workqueue(md_misc_wq);
8870 destroy_workqueue(md_wq);
1da177e4
LT		 8871}
8872
685784aa 8873subsys_initcall(md_init);
1da177e4
LT		 8874module_exit(md_exit)
8875
f91de92e
N		 8876static int get_ro(char *buffer, struct kernel_param *kp)
8877{
8878 return sprintf(buffer, "%d", start_readonly);
8879}
8880static int set_ro(const char *val, struct kernel_param *kp)
8881{
4c9309c0 8882 return kstrtouint(val, 10, (unsigned int *)&start_readonly);
f91de92e
N		 8883}
8884
80ca3a44
N		 8885module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
8886module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
efeb53c0 8887module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
f91de92e 8888
1da177e4 8889MODULE_LICENSE("GPL");
0efb9e61 8890MODULE_DESCRIPTION("MD RAID framework");
aa1595e9 8891MODULE_ALIAS("md");
72008652 8892MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Linux 6.x block layer and io_uring tree(s)