Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
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 | ||
35 | #include <linux/module.h> | |
50511da3 | 36 | #include <linux/kernel.h> |
a6fb0934 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
38 | #include <linux/linkage.h> |
39 | #include <linux/raid/md.h> | |
32a7627c | 40 | #include <linux/raid/bitmap.h> |
1da177e4 | 41 | #include <linux/sysctl.h> |
1da177e4 | 42 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 43 | #include <linux/poll.h> |
48c9c27b | 44 | #include <linux/mutex.h> |
16f17b39 | 45 | #include <linux/ctype.h> |
7dfb7103 | 46 | #include <linux/freezer.h> |
1da177e4 LT |
47 | |
48 | #include <linux/init.h> | |
49 | ||
32a7627c N |
50 | #include <linux/file.h> |
51 | ||
1da177e4 LT |
52 | #ifdef CONFIG_KMOD |
53 | #include <linux/kmod.h> | |
54 | #endif | |
55 | ||
56 | #include <asm/unaligned.h> | |
57 | ||
58 | #define MAJOR_NR MD_MAJOR | |
59 | #define MD_DRIVER | |
60 | ||
61 | /* 63 partitions with the alternate major number (mdp) */ | |
62 | #define MdpMinorShift 6 | |
63 | ||
64 | #define DEBUG 0 | |
65 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
66 | ||
67 | ||
68 | #ifndef MODULE | |
69 | static void autostart_arrays (int part); | |
70 | #endif | |
71 | ||
2604b703 | 72 | static LIST_HEAD(pers_list); |
1da177e4 LT |
73 | static DEFINE_SPINLOCK(pers_lock); |
74 | ||
5e56341d AB |
75 | static void md_print_devices(void); |
76 | ||
77 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } | |
78 | ||
1da177e4 LT |
79 | /* |
80 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
81 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
82 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 83 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
84 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
85 | * speed limit - in case reconstruction slows down your system despite | |
86 | * idle IO detection. | |
87 | * | |
88 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 89 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
90 | */ |
91 | ||
92 | static int sysctl_speed_limit_min = 1000; | |
93 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
94 | static inline int speed_min(mddev_t *mddev) |
95 | { | |
96 | return mddev->sync_speed_min ? | |
97 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
98 | } | |
99 | ||
100 | static inline int speed_max(mddev_t *mddev) | |
101 | { | |
102 | return mddev->sync_speed_max ? | |
103 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
104 | } | |
1da177e4 LT |
105 | |
106 | static struct ctl_table_header *raid_table_header; | |
107 | ||
108 | static ctl_table raid_table[] = { | |
109 | { | |
110 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
111 | .procname = "speed_limit_min", | |
112 | .data = &sysctl_speed_limit_min, | |
113 | .maxlen = sizeof(int), | |
80ca3a44 | 114 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
115 | .proc_handler = &proc_dointvec, |
116 | }, | |
117 | { | |
118 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
119 | .procname = "speed_limit_max", | |
120 | .data = &sysctl_speed_limit_max, | |
121 | .maxlen = sizeof(int), | |
80ca3a44 | 122 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
123 | .proc_handler = &proc_dointvec, |
124 | }, | |
125 | { .ctl_name = 0 } | |
126 | }; | |
127 | ||
128 | static ctl_table raid_dir_table[] = { | |
129 | { | |
130 | .ctl_name = DEV_RAID, | |
131 | .procname = "raid", | |
132 | .maxlen = 0, | |
80ca3a44 | 133 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
134 | .child = raid_table, |
135 | }, | |
136 | { .ctl_name = 0 } | |
137 | }; | |
138 | ||
139 | static ctl_table raid_root_table[] = { | |
140 | { | |
141 | .ctl_name = CTL_DEV, | |
142 | .procname = "dev", | |
143 | .maxlen = 0, | |
144 | .mode = 0555, | |
145 | .child = raid_dir_table, | |
146 | }, | |
147 | { .ctl_name = 0 } | |
148 | }; | |
149 | ||
150 | static struct block_device_operations md_fops; | |
151 | ||
f91de92e N |
152 | static int start_readonly; |
153 | ||
d7603b7e N |
154 | /* |
155 | * We have a system wide 'event count' that is incremented | |
156 | * on any 'interesting' event, and readers of /proc/mdstat | |
157 | * can use 'poll' or 'select' to find out when the event | |
158 | * count increases. | |
159 | * | |
160 | * Events are: | |
161 | * start array, stop array, error, add device, remove device, | |
162 | * start build, activate spare | |
163 | */ | |
2989ddbd | 164 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 165 | static atomic_t md_event_count; |
29269553 | 166 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
167 | { |
168 | atomic_inc(&md_event_count); | |
169 | wake_up(&md_event_waiters); | |
4508a7a7 | 170 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
d7603b7e | 171 | } |
29269553 | 172 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 173 | |
c331eb04 N |
174 | /* Alternate version that can be called from interrupts |
175 | * when calling sysfs_notify isn't needed. | |
176 | */ | |
05381954 | 177 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
178 | { |
179 | atomic_inc(&md_event_count); | |
180 | wake_up(&md_event_waiters); | |
181 | } | |
182 | ||
1da177e4 LT |
183 | /* |
184 | * Enables to iterate over all existing md arrays | |
185 | * all_mddevs_lock protects this list. | |
186 | */ | |
187 | static LIST_HEAD(all_mddevs); | |
188 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
189 | ||
190 | ||
191 | /* | |
192 | * iterates through all used mddevs in the system. | |
193 | * We take care to grab the all_mddevs_lock whenever navigating | |
194 | * the list, and to always hold a refcount when unlocked. | |
195 | * Any code which breaks out of this loop while own | |
196 | * a reference to the current mddev and must mddev_put it. | |
197 | */ | |
29ac4aa3 | 198 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
199 | \ |
200 | for (({ spin_lock(&all_mddevs_lock); \ | |
201 | tmp = all_mddevs.next; \ | |
202 | mddev = NULL;}); \ | |
203 | ({ if (tmp != &all_mddevs) \ | |
204 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
205 | spin_unlock(&all_mddevs_lock); \ | |
206 | if (mddev) mddev_put(mddev); \ | |
207 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
208 | tmp != &all_mddevs;}); \ | |
209 | ({ spin_lock(&all_mddevs_lock); \ | |
210 | tmp = tmp->next;}) \ | |
211 | ) | |
212 | ||
213 | ||
165125e1 | 214 | static int md_fail_request (struct request_queue *q, struct bio *bio) |
1da177e4 | 215 | { |
6712ecf8 | 216 | bio_io_error(bio); |
1da177e4 LT |
217 | return 0; |
218 | } | |
219 | ||
220 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
221 | { | |
222 | atomic_inc(&mddev->active); | |
223 | return mddev; | |
224 | } | |
225 | ||
226 | static void mddev_put(mddev_t *mddev) | |
227 | { | |
228 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
229 | return; | |
230 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
231 | list_del(&mddev->all_mddevs); | |
926ce2d8 | 232 | spin_unlock(&all_mddevs_lock); |
1312f40e | 233 | blk_cleanup_queue(mddev->queue); |
c10997f6 | 234 | kobject_put(&mddev->kobj); |
926ce2d8 N |
235 | } else |
236 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
237 | } |
238 | ||
239 | static mddev_t * mddev_find(dev_t unit) | |
240 | { | |
241 | mddev_t *mddev, *new = NULL; | |
242 | ||
243 | retry: | |
244 | spin_lock(&all_mddevs_lock); | |
245 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
246 | if (mddev->unit == unit) { | |
247 | mddev_get(mddev); | |
248 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 249 | kfree(new); |
1da177e4 LT |
250 | return mddev; |
251 | } | |
252 | ||
253 | if (new) { | |
254 | list_add(&new->all_mddevs, &all_mddevs); | |
255 | spin_unlock(&all_mddevs_lock); | |
256 | return new; | |
257 | } | |
258 | spin_unlock(&all_mddevs_lock); | |
259 | ||
9ffae0cf | 260 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
261 | if (!new) |
262 | return NULL; | |
263 | ||
1da177e4 LT |
264 | new->unit = unit; |
265 | if (MAJOR(unit) == MD_MAJOR) | |
266 | new->md_minor = MINOR(unit); | |
267 | else | |
268 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
269 | ||
df5b89b3 | 270 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
271 | INIT_LIST_HEAD(&new->disks); |
272 | INIT_LIST_HEAD(&new->all_mddevs); | |
273 | init_timer(&new->safemode_timer); | |
274 | atomic_set(&new->active, 1); | |
06d91a5f | 275 | spin_lock_init(&new->write_lock); |
3d310eb7 | 276 | init_waitqueue_head(&new->sb_wait); |
08a02ecd | 277 | new->reshape_position = MaxSector; |
c6207277 | 278 | new->resync_max = MaxSector; |
1da177e4 LT |
279 | |
280 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
281 | if (!new->queue) { | |
282 | kfree(new); | |
283 | return NULL; | |
284 | } | |
89e5c8b5 | 285 | set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags); |
1da177e4 LT |
286 | |
287 | blk_queue_make_request(new->queue, md_fail_request); | |
288 | ||
289 | goto retry; | |
290 | } | |
291 | ||
292 | static inline int mddev_lock(mddev_t * mddev) | |
293 | { | |
df5b89b3 | 294 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
295 | } |
296 | ||
1da177e4 LT |
297 | static inline int mddev_trylock(mddev_t * mddev) |
298 | { | |
df5b89b3 | 299 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
300 | } |
301 | ||
302 | static inline void mddev_unlock(mddev_t * mddev) | |
303 | { | |
df5b89b3 | 304 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 305 | |
005eca5e | 306 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
307 | } |
308 | ||
2989ddbd | 309 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 LT |
310 | { |
311 | mdk_rdev_t * rdev; | |
312 | struct list_head *tmp; | |
313 | ||
d089c6af | 314 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
315 | if (rdev->desc_nr == nr) |
316 | return rdev; | |
317 | } | |
318 | return NULL; | |
319 | } | |
320 | ||
321 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
322 | { | |
323 | struct list_head *tmp; | |
324 | mdk_rdev_t *rdev; | |
325 | ||
d089c6af | 326 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
327 | if (rdev->bdev->bd_dev == dev) |
328 | return rdev; | |
329 | } | |
330 | return NULL; | |
331 | } | |
332 | ||
d9d166c2 | 333 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
334 | { |
335 | struct mdk_personality *pers; | |
d9d166c2 N |
336 | list_for_each_entry(pers, &pers_list, list) { |
337 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 338 | return pers; |
d9d166c2 N |
339 | if (strcmp(pers->name, clevel)==0) |
340 | return pers; | |
341 | } | |
2604b703 N |
342 | return NULL; |
343 | } | |
344 | ||
77933d72 | 345 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
346 | { |
347 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
348 | return MD_NEW_SIZE_BLOCKS(size); | |
349 | } | |
350 | ||
351 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
352 | { | |
353 | sector_t size; | |
354 | ||
355 | size = rdev->sb_offset; | |
356 | ||
357 | if (chunk_size) | |
358 | size &= ~((sector_t)chunk_size/1024 - 1); | |
359 | return size; | |
360 | } | |
361 | ||
362 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
363 | { | |
364 | if (rdev->sb_page) | |
365 | MD_BUG(); | |
366 | ||
367 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
368 | if (!rdev->sb_page) { | |
369 | printk(KERN_ALERT "md: out of memory.\n"); | |
370 | return -EINVAL; | |
371 | } | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static void free_disk_sb(mdk_rdev_t * rdev) | |
377 | { | |
378 | if (rdev->sb_page) { | |
2d1f3b5d | 379 | put_page(rdev->sb_page); |
1da177e4 LT |
380 | rdev->sb_loaded = 0; |
381 | rdev->sb_page = NULL; | |
382 | rdev->sb_offset = 0; | |
383 | rdev->size = 0; | |
384 | } | |
385 | } | |
386 | ||
387 | ||
6712ecf8 | 388 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
389 | { |
390 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 391 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 392 | |
3a0f5bbb N |
393 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
394 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
395 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
396 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 397 | md_error(mddev, rdev); |
3a0f5bbb | 398 | } |
7bfa19f2 | 399 | |
a9701a30 N |
400 | if (atomic_dec_and_test(&mddev->pending_writes)) |
401 | wake_up(&mddev->sb_wait); | |
f8b58edf | 402 | bio_put(bio); |
7bfa19f2 N |
403 | } |
404 | ||
6712ecf8 | 405 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
406 | { |
407 | struct bio *bio2 = bio->bi_private; | |
408 | mdk_rdev_t *rdev = bio2->bi_private; | |
409 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
410 | |
411 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
412 | error == -EOPNOTSUPP) { | |
413 | unsigned long flags; | |
414 | /* barriers don't appear to be supported :-( */ | |
415 | set_bit(BarriersNotsupp, &rdev->flags); | |
416 | mddev->barriers_work = 0; | |
417 | spin_lock_irqsave(&mddev->write_lock, flags); | |
418 | bio2->bi_next = mddev->biolist; | |
419 | mddev->biolist = bio2; | |
420 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
421 | wake_up(&mddev->sb_wait); | |
422 | bio_put(bio); | |
6712ecf8 N |
423 | } else { |
424 | bio_put(bio2); | |
425 | bio->bi_private = rdev; | |
426 | super_written(bio, error); | |
a9701a30 | 427 | } |
a9701a30 N |
428 | } |
429 | ||
7bfa19f2 N |
430 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
431 | sector_t sector, int size, struct page *page) | |
432 | { | |
433 | /* write first size bytes of page to sector of rdev | |
434 | * Increment mddev->pending_writes before returning | |
435 | * and decrement it on completion, waking up sb_wait | |
436 | * if zero is reached. | |
437 | * If an error occurred, call md_error | |
a9701a30 N |
438 | * |
439 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
440 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
441 | */ |
442 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 443 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
444 | |
445 | bio->bi_bdev = rdev->bdev; | |
446 | bio->bi_sector = sector; | |
447 | bio_add_page(bio, page, size, 0); | |
448 | bio->bi_private = rdev; | |
449 | bio->bi_end_io = super_written; | |
a9701a30 N |
450 | bio->bi_rw = rw; |
451 | ||
7bfa19f2 | 452 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
453 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
454 | struct bio *rbio; | |
455 | rw |= (1<<BIO_RW_BARRIER); | |
456 | rbio = bio_clone(bio, GFP_NOIO); | |
457 | rbio->bi_private = bio; | |
458 | rbio->bi_end_io = super_written_barrier; | |
459 | submit_bio(rw, rbio); | |
460 | } else | |
461 | submit_bio(rw, bio); | |
462 | } | |
463 | ||
464 | void md_super_wait(mddev_t *mddev) | |
465 | { | |
466 | /* wait for all superblock writes that were scheduled to complete. | |
467 | * if any had to be retried (due to BARRIER problems), retry them | |
468 | */ | |
469 | DEFINE_WAIT(wq); | |
470 | for(;;) { | |
471 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
472 | if (atomic_read(&mddev->pending_writes)==0) | |
473 | break; | |
474 | while (mddev->biolist) { | |
475 | struct bio *bio; | |
476 | spin_lock_irq(&mddev->write_lock); | |
477 | bio = mddev->biolist; | |
478 | mddev->biolist = bio->bi_next ; | |
479 | bio->bi_next = NULL; | |
480 | spin_unlock_irq(&mddev->write_lock); | |
481 | submit_bio(bio->bi_rw, bio); | |
482 | } | |
483 | schedule(); | |
484 | } | |
485 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
486 | } |
487 | ||
6712ecf8 | 488 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 489 | { |
1da177e4 | 490 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
491 | } |
492 | ||
a654b9d8 | 493 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
494 | struct page *page, int rw) |
495 | { | |
baaa2c51 | 496 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
497 | struct completion event; |
498 | int ret; | |
499 | ||
500 | rw |= (1 << BIO_RW_SYNC); | |
501 | ||
502 | bio->bi_bdev = bdev; | |
503 | bio->bi_sector = sector; | |
504 | bio_add_page(bio, page, size, 0); | |
505 | init_completion(&event); | |
506 | bio->bi_private = &event; | |
507 | bio->bi_end_io = bi_complete; | |
508 | submit_bio(rw, bio); | |
509 | wait_for_completion(&event); | |
510 | ||
511 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
512 | bio_put(bio); | |
513 | return ret; | |
514 | } | |
a8745db2 | 515 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 516 | |
0002b271 | 517 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
518 | { |
519 | char b[BDEVNAME_SIZE]; | |
520 | if (!rdev->sb_page) { | |
521 | MD_BUG(); | |
522 | return -EINVAL; | |
523 | } | |
524 | if (rdev->sb_loaded) | |
525 | return 0; | |
526 | ||
527 | ||
0002b271 | 528 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
529 | goto fail; |
530 | rdev->sb_loaded = 1; | |
531 | return 0; | |
532 | ||
533 | fail: | |
534 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
535 | bdevname(rdev->bdev,b)); | |
536 | return -EINVAL; | |
537 | } | |
538 | ||
539 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
540 | { | |
541 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
542 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
543 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
544 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
545 | ||
546 | return 1; | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
551 | ||
552 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
553 | { | |
554 | int ret; | |
555 | mdp_super_t *tmp1, *tmp2; | |
556 | ||
557 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
558 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
559 | ||
560 | if (!tmp1 || !tmp2) { | |
561 | ret = 0; | |
562 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
563 | goto abort; | |
564 | } | |
565 | ||
566 | *tmp1 = *sb1; | |
567 | *tmp2 = *sb2; | |
568 | ||
569 | /* | |
570 | * nr_disks is not constant | |
571 | */ | |
572 | tmp1->nr_disks = 0; | |
573 | tmp2->nr_disks = 0; | |
574 | ||
575 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
576 | ret = 0; | |
577 | else | |
578 | ret = 1; | |
579 | ||
580 | abort: | |
990a8baf JJ |
581 | kfree(tmp1); |
582 | kfree(tmp2); | |
1da177e4 LT |
583 | return ret; |
584 | } | |
585 | ||
4d167f09 N |
586 | |
587 | static u32 md_csum_fold(u32 csum) | |
588 | { | |
589 | csum = (csum & 0xffff) + (csum >> 16); | |
590 | return (csum & 0xffff) + (csum >> 16); | |
591 | } | |
592 | ||
1da177e4 LT |
593 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
594 | { | |
4d167f09 N |
595 | u64 newcsum = 0; |
596 | u32 *sb32 = (u32*)sb; | |
597 | int i; | |
1da177e4 LT |
598 | unsigned int disk_csum, csum; |
599 | ||
600 | disk_csum = sb->sb_csum; | |
601 | sb->sb_csum = 0; | |
4d167f09 N |
602 | |
603 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
604 | newcsum += sb32[i]; | |
605 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
606 | ||
607 | ||
608 | #ifdef CONFIG_ALPHA | |
609 | /* This used to use csum_partial, which was wrong for several | |
610 | * reasons including that different results are returned on | |
611 | * different architectures. It isn't critical that we get exactly | |
612 | * the same return value as before (we always csum_fold before | |
613 | * testing, and that removes any differences). However as we | |
614 | * know that csum_partial always returned a 16bit value on | |
615 | * alphas, do a fold to maximise conformity to previous behaviour. | |
616 | */ | |
617 | sb->sb_csum = md_csum_fold(disk_csum); | |
618 | #else | |
1da177e4 | 619 | sb->sb_csum = disk_csum; |
4d167f09 | 620 | #endif |
1da177e4 LT |
621 | return csum; |
622 | } | |
623 | ||
624 | ||
625 | /* | |
626 | * Handle superblock details. | |
627 | * We want to be able to handle multiple superblock formats | |
628 | * so we have a common interface to them all, and an array of | |
629 | * different handlers. | |
630 | * We rely on user-space to write the initial superblock, and support | |
631 | * reading and updating of superblocks. | |
632 | * Interface methods are: | |
633 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
634 | * loads and validates a superblock on dev. | |
635 | * if refdev != NULL, compare superblocks on both devices | |
636 | * Return: | |
637 | * 0 - dev has a superblock that is compatible with refdev | |
638 | * 1 - dev has a superblock that is compatible and newer than refdev | |
639 | * so dev should be used as the refdev in future | |
640 | * -EINVAL superblock incompatible or invalid | |
641 | * -othererror e.g. -EIO | |
642 | * | |
643 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
644 | * Verify that dev is acceptable into mddev. | |
645 | * The first time, mddev->raid_disks will be 0, and data from | |
646 | * dev should be merged in. Subsequent calls check that dev | |
647 | * is new enough. Return 0 or -EINVAL | |
648 | * | |
649 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
650 | * Update the superblock for rdev with data in mddev | |
651 | * This does not write to disc. | |
652 | * | |
653 | */ | |
654 | ||
655 | struct super_type { | |
656 | char *name; | |
657 | struct module *owner; | |
658 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
659 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
660 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
661 | }; | |
662 | ||
663 | /* | |
664 | * load_super for 0.90.0 | |
665 | */ | |
666 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
667 | { | |
668 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
669 | mdp_super_t *sb; | |
670 | int ret; | |
671 | sector_t sb_offset; | |
672 | ||
673 | /* | |
674 | * Calculate the position of the superblock, | |
675 | * it's at the end of the disk. | |
676 | * | |
677 | * It also happens to be a multiple of 4Kb. | |
678 | */ | |
679 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
680 | rdev->sb_offset = sb_offset; | |
681 | ||
0002b271 | 682 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
683 | if (ret) return ret; |
684 | ||
685 | ret = -EINVAL; | |
686 | ||
687 | bdevname(rdev->bdev, b); | |
688 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
689 | ||
690 | if (sb->md_magic != MD_SB_MAGIC) { | |
691 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
692 | b); | |
693 | goto abort; | |
694 | } | |
695 | ||
696 | if (sb->major_version != 0 || | |
f6705578 N |
697 | sb->minor_version < 90 || |
698 | sb->minor_version > 91) { | |
1da177e4 LT |
699 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
700 | sb->major_version, sb->minor_version, | |
701 | b); | |
702 | goto abort; | |
703 | } | |
704 | ||
705 | if (sb->raid_disks <= 0) | |
706 | goto abort; | |
707 | ||
4d167f09 | 708 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
709 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
710 | b); | |
711 | goto abort; | |
712 | } | |
713 | ||
714 | rdev->preferred_minor = sb->md_minor; | |
715 | rdev->data_offset = 0; | |
0002b271 | 716 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 717 | |
e11e93fa N |
718 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
719 | if (sb->level != 1 && sb->level != 4 | |
720 | && sb->level != 5 && sb->level != 6 | |
721 | && sb->level != 10) { | |
722 | /* FIXME use a better test */ | |
723 | printk(KERN_WARNING | |
724 | "md: bitmaps not supported for this level.\n"); | |
725 | goto abort; | |
726 | } | |
727 | } | |
728 | ||
1da177e4 LT |
729 | if (sb->level == LEVEL_MULTIPATH) |
730 | rdev->desc_nr = -1; | |
731 | else | |
732 | rdev->desc_nr = sb->this_disk.number; | |
733 | ||
9a7b2b0f | 734 | if (!refdev) { |
1da177e4 | 735 | ret = 1; |
9a7b2b0f | 736 | } else { |
1da177e4 LT |
737 | __u64 ev1, ev2; |
738 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
739 | if (!uuid_equal(refsb, sb)) { | |
740 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
741 | b, bdevname(refdev->bdev,b2)); | |
742 | goto abort; | |
743 | } | |
744 | if (!sb_equal(refsb, sb)) { | |
745 | printk(KERN_WARNING "md: %s has same UUID" | |
746 | " but different superblock to %s\n", | |
747 | b, bdevname(refdev->bdev, b2)); | |
748 | goto abort; | |
749 | } | |
750 | ev1 = md_event(sb); | |
751 | ev2 = md_event(refsb); | |
752 | if (ev1 > ev2) | |
753 | ret = 1; | |
754 | else | |
755 | ret = 0; | |
756 | } | |
757 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
758 | ||
2bf071bf N |
759 | if (rdev->size < sb->size && sb->level > 1) |
760 | /* "this cannot possibly happen" ... */ | |
761 | ret = -EINVAL; | |
762 | ||
1da177e4 LT |
763 | abort: |
764 | return ret; | |
765 | } | |
766 | ||
767 | /* | |
768 | * validate_super for 0.90.0 | |
769 | */ | |
770 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
771 | { | |
772 | mdp_disk_t *desc; | |
773 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 774 | __u64 ev1 = md_event(sb); |
1da177e4 | 775 | |
41158c7e | 776 | rdev->raid_disk = -1; |
c5d79adb N |
777 | clear_bit(Faulty, &rdev->flags); |
778 | clear_bit(In_sync, &rdev->flags); | |
779 | clear_bit(WriteMostly, &rdev->flags); | |
780 | clear_bit(BarriersNotsupp, &rdev->flags); | |
781 | ||
1da177e4 LT |
782 | if (mddev->raid_disks == 0) { |
783 | mddev->major_version = 0; | |
784 | mddev->minor_version = sb->minor_version; | |
785 | mddev->patch_version = sb->patch_version; | |
e691063a | 786 | mddev->external = 0; |
1da177e4 LT |
787 | mddev->chunk_size = sb->chunk_size; |
788 | mddev->ctime = sb->ctime; | |
789 | mddev->utime = sb->utime; | |
790 | mddev->level = sb->level; | |
d9d166c2 | 791 | mddev->clevel[0] = 0; |
1da177e4 LT |
792 | mddev->layout = sb->layout; |
793 | mddev->raid_disks = sb->raid_disks; | |
794 | mddev->size = sb->size; | |
07d84d10 | 795 | mddev->events = ev1; |
9223214e | 796 | mddev->bitmap_offset = 0; |
36fa3063 | 797 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 798 | |
f6705578 N |
799 | if (mddev->minor_version >= 91) { |
800 | mddev->reshape_position = sb->reshape_position; | |
801 | mddev->delta_disks = sb->delta_disks; | |
802 | mddev->new_level = sb->new_level; | |
803 | mddev->new_layout = sb->new_layout; | |
804 | mddev->new_chunk = sb->new_chunk; | |
805 | } else { | |
806 | mddev->reshape_position = MaxSector; | |
807 | mddev->delta_disks = 0; | |
808 | mddev->new_level = mddev->level; | |
809 | mddev->new_layout = mddev->layout; | |
810 | mddev->new_chunk = mddev->chunk_size; | |
811 | } | |
812 | ||
1da177e4 LT |
813 | if (sb->state & (1<<MD_SB_CLEAN)) |
814 | mddev->recovery_cp = MaxSector; | |
815 | else { | |
816 | if (sb->events_hi == sb->cp_events_hi && | |
817 | sb->events_lo == sb->cp_events_lo) { | |
818 | mddev->recovery_cp = sb->recovery_cp; | |
819 | } else | |
820 | mddev->recovery_cp = 0; | |
821 | } | |
822 | ||
823 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
824 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
825 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
826 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
827 | ||
828 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
829 | |
830 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 831 | mddev->bitmap_file == NULL) |
36fa3063 | 832 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 833 | |
41158c7e N |
834 | } else if (mddev->pers == NULL) { |
835 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
836 | ++ev1; |
837 | if (ev1 < mddev->events) | |
838 | return -EINVAL; | |
41158c7e N |
839 | } else if (mddev->bitmap) { |
840 | /* if adding to array with a bitmap, then we can accept an | |
841 | * older device ... but not too old. | |
842 | */ | |
41158c7e N |
843 | if (ev1 < mddev->bitmap->events_cleared) |
844 | return 0; | |
07d84d10 N |
845 | } else { |
846 | if (ev1 < mddev->events) | |
847 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
848 | return 0; | |
849 | } | |
41158c7e | 850 | |
1da177e4 | 851 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
852 | desc = sb->disks + rdev->desc_nr; |
853 | ||
854 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 855 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
856 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
857 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 858 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
859 | rdev->raid_disk = desc->raid_disk; |
860 | } | |
8ddf9efe N |
861 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
862 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 863 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 864 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
865 | return 0; |
866 | } | |
867 | ||
868 | /* | |
869 | * sync_super for 0.90.0 | |
870 | */ | |
871 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
872 | { | |
873 | mdp_super_t *sb; | |
874 | struct list_head *tmp; | |
875 | mdk_rdev_t *rdev2; | |
876 | int next_spare = mddev->raid_disks; | |
19133a42 | 877 | |
1da177e4 LT |
878 | |
879 | /* make rdev->sb match mddev data.. | |
880 | * | |
881 | * 1/ zero out disks | |
882 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
883 | * 3/ any empty disks < next_spare become removed | |
884 | * | |
885 | * disks[0] gets initialised to REMOVED because | |
886 | * we cannot be sure from other fields if it has | |
887 | * been initialised or not. | |
888 | */ | |
889 | int i; | |
890 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
891 | ||
61181565 N |
892 | rdev->sb_size = MD_SB_BYTES; |
893 | ||
1da177e4 LT |
894 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
895 | ||
896 | memset(sb, 0, sizeof(*sb)); | |
897 | ||
898 | sb->md_magic = MD_SB_MAGIC; | |
899 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
900 | sb->patch_version = mddev->patch_version; |
901 | sb->gvalid_words = 0; /* ignored */ | |
902 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
903 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
904 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
905 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
906 | ||
907 | sb->ctime = mddev->ctime; | |
908 | sb->level = mddev->level; | |
909 | sb->size = mddev->size; | |
910 | sb->raid_disks = mddev->raid_disks; | |
911 | sb->md_minor = mddev->md_minor; | |
e691063a | 912 | sb->not_persistent = 0; |
1da177e4 LT |
913 | sb->utime = mddev->utime; |
914 | sb->state = 0; | |
915 | sb->events_hi = (mddev->events>>32); | |
916 | sb->events_lo = (u32)mddev->events; | |
917 | ||
f6705578 N |
918 | if (mddev->reshape_position == MaxSector) |
919 | sb->minor_version = 90; | |
920 | else { | |
921 | sb->minor_version = 91; | |
922 | sb->reshape_position = mddev->reshape_position; | |
923 | sb->new_level = mddev->new_level; | |
924 | sb->delta_disks = mddev->delta_disks; | |
925 | sb->new_layout = mddev->new_layout; | |
926 | sb->new_chunk = mddev->new_chunk; | |
927 | } | |
928 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
929 | if (mddev->in_sync) |
930 | { | |
931 | sb->recovery_cp = mddev->recovery_cp; | |
932 | sb->cp_events_hi = (mddev->events>>32); | |
933 | sb->cp_events_lo = (u32)mddev->events; | |
934 | if (mddev->recovery_cp == MaxSector) | |
935 | sb->state = (1<< MD_SB_CLEAN); | |
936 | } else | |
937 | sb->recovery_cp = 0; | |
938 | ||
939 | sb->layout = mddev->layout; | |
940 | sb->chunk_size = mddev->chunk_size; | |
941 | ||
a654b9d8 N |
942 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
943 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
944 | ||
1da177e4 | 945 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
d089c6af | 946 | rdev_for_each(rdev2, tmp, mddev) { |
1da177e4 | 947 | mdp_disk_t *d; |
86e6ffdd | 948 | int desc_nr; |
b2d444d7 N |
949 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
950 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 951 | desc_nr = rdev2->raid_disk; |
1da177e4 | 952 | else |
86e6ffdd | 953 | desc_nr = next_spare++; |
19133a42 | 954 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
955 | d = &sb->disks[rdev2->desc_nr]; |
956 | nr_disks++; | |
957 | d->number = rdev2->desc_nr; | |
958 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
959 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
960 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
961 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
962 | d->raid_disk = rdev2->raid_disk; |
963 | else | |
964 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 965 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 966 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 967 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
968 | d->state = (1<<MD_DISK_ACTIVE); |
969 | d->state |= (1<<MD_DISK_SYNC); | |
970 | active++; | |
971 | working++; | |
972 | } else { | |
973 | d->state = 0; | |
974 | spare++; | |
975 | working++; | |
976 | } | |
8ddf9efe N |
977 | if (test_bit(WriteMostly, &rdev2->flags)) |
978 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 979 | } |
1da177e4 LT |
980 | /* now set the "removed" and "faulty" bits on any missing devices */ |
981 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
982 | mdp_disk_t *d = &sb->disks[i]; | |
983 | if (d->state == 0 && d->number == 0) { | |
984 | d->number = i; | |
985 | d->raid_disk = i; | |
986 | d->state = (1<<MD_DISK_REMOVED); | |
987 | d->state |= (1<<MD_DISK_FAULTY); | |
988 | failed++; | |
989 | } | |
990 | } | |
991 | sb->nr_disks = nr_disks; | |
992 | sb->active_disks = active; | |
993 | sb->working_disks = working; | |
994 | sb->failed_disks = failed; | |
995 | sb->spare_disks = spare; | |
996 | ||
997 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
998 | sb->sb_csum = calc_sb_csum(sb); | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * version 1 superblock | |
1003 | */ | |
1004 | ||
1c05b4bc | 1005 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1006 | { |
1c05b4bc N |
1007 | __le32 disk_csum; |
1008 | u32 csum; | |
1da177e4 LT |
1009 | unsigned long long newcsum; |
1010 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1011 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1012 | int i; |
1013 | ||
1014 | disk_csum = sb->sb_csum; | |
1015 | sb->sb_csum = 0; | |
1016 | newcsum = 0; | |
1017 | for (i=0; size>=4; size -= 4 ) | |
1018 | newcsum += le32_to_cpu(*isuper++); | |
1019 | ||
1020 | if (size == 2) | |
1c05b4bc | 1021 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1022 | |
1023 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1024 | sb->sb_csum = disk_csum; | |
1025 | return cpu_to_le32(csum); | |
1026 | } | |
1027 | ||
1028 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1029 | { | |
1030 | struct mdp_superblock_1 *sb; | |
1031 | int ret; | |
1032 | sector_t sb_offset; | |
1033 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 1034 | int bmask; |
1da177e4 LT |
1035 | |
1036 | /* | |
1037 | * Calculate the position of the superblock. | |
1038 | * It is always aligned to a 4K boundary and | |
1039 | * depeding on minor_version, it can be: | |
1040 | * 0: At least 8K, but less than 12K, from end of device | |
1041 | * 1: At start of device | |
1042 | * 2: 4K from start of device. | |
1043 | */ | |
1044 | switch(minor_version) { | |
1045 | case 0: | |
1046 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
1047 | sb_offset -= 8*2; | |
39730960 | 1048 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
1049 | /* convert from sectors to K */ |
1050 | sb_offset /= 2; | |
1051 | break; | |
1052 | case 1: | |
1053 | sb_offset = 0; | |
1054 | break; | |
1055 | case 2: | |
1056 | sb_offset = 4; | |
1057 | break; | |
1058 | default: | |
1059 | return -EINVAL; | |
1060 | } | |
1061 | rdev->sb_offset = sb_offset; | |
1062 | ||
0002b271 N |
1063 | /* superblock is rarely larger than 1K, but it can be larger, |
1064 | * and it is safe to read 4k, so we do that | |
1065 | */ | |
1066 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1067 | if (ret) return ret; |
1068 | ||
1069 | ||
1070 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1071 | ||
1072 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1073 | sb->major_version != cpu_to_le32(1) || | |
1074 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
1075 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 1076 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1077 | return -EINVAL; |
1078 | ||
1079 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1080 | printk("md: invalid superblock checksum on %s\n", | |
1081 | bdevname(rdev->bdev,b)); | |
1082 | return -EINVAL; | |
1083 | } | |
1084 | if (le64_to_cpu(sb->data_size) < 10) { | |
1085 | printk("md: data_size too small on %s\n", | |
1086 | bdevname(rdev->bdev,b)); | |
1087 | return -EINVAL; | |
1088 | } | |
e11e93fa N |
1089 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1090 | if (sb->level != cpu_to_le32(1) && | |
1091 | sb->level != cpu_to_le32(4) && | |
1092 | sb->level != cpu_to_le32(5) && | |
1093 | sb->level != cpu_to_le32(6) && | |
1094 | sb->level != cpu_to_le32(10)) { | |
1095 | printk(KERN_WARNING | |
1096 | "md: bitmaps not supported for this level.\n"); | |
1097 | return -EINVAL; | |
1098 | } | |
1099 | } | |
1100 | ||
1da177e4 LT |
1101 | rdev->preferred_minor = 0xffff; |
1102 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1103 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1104 | |
0002b271 | 1105 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1106 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1107 | if (rdev->sb_size & bmask) |
a1801f85 N |
1108 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1109 | ||
1110 | if (minor_version | |
1111 | && rdev->data_offset < sb_offset + (rdev->sb_size/512)) | |
1112 | return -EINVAL; | |
0002b271 | 1113 | |
31b65a0d N |
1114 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1115 | rdev->desc_nr = -1; | |
1116 | else | |
1117 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1118 | ||
9a7b2b0f | 1119 | if (!refdev) { |
8ed75463 | 1120 | ret = 1; |
9a7b2b0f | 1121 | } else { |
1da177e4 LT |
1122 | __u64 ev1, ev2; |
1123 | struct mdp_superblock_1 *refsb = | |
1124 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1125 | ||
1126 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1127 | sb->level != refsb->level || | |
1128 | sb->layout != refsb->layout || | |
1129 | sb->chunksize != refsb->chunksize) { | |
1130 | printk(KERN_WARNING "md: %s has strangely different" | |
1131 | " superblock to %s\n", | |
1132 | bdevname(rdev->bdev,b), | |
1133 | bdevname(refdev->bdev,b2)); | |
1134 | return -EINVAL; | |
1135 | } | |
1136 | ev1 = le64_to_cpu(sb->events); | |
1137 | ev2 = le64_to_cpu(refsb->events); | |
1138 | ||
1139 | if (ev1 > ev2) | |
8ed75463 N |
1140 | ret = 1; |
1141 | else | |
1142 | ret = 0; | |
1da177e4 | 1143 | } |
a1801f85 | 1144 | if (minor_version) |
1da177e4 LT |
1145 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; |
1146 | else | |
1147 | rdev->size = rdev->sb_offset; | |
1148 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1149 | return -EINVAL; | |
1150 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1151 | if (le32_to_cpu(sb->chunksize)) | |
1152 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1153 | |
1c05b4bc | 1154 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1155 | return -EINVAL; |
8ed75463 | 1156 | return ret; |
1da177e4 LT |
1157 | } |
1158 | ||
1159 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1160 | { | |
1161 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1162 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1163 | |
41158c7e | 1164 | rdev->raid_disk = -1; |
c5d79adb N |
1165 | clear_bit(Faulty, &rdev->flags); |
1166 | clear_bit(In_sync, &rdev->flags); | |
1167 | clear_bit(WriteMostly, &rdev->flags); | |
1168 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1169 | ||
1da177e4 LT |
1170 | if (mddev->raid_disks == 0) { |
1171 | mddev->major_version = 1; | |
1172 | mddev->patch_version = 0; | |
e691063a | 1173 | mddev->external = 0; |
1da177e4 LT |
1174 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1175 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1176 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1177 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1178 | mddev->clevel[0] = 0; |
1da177e4 LT |
1179 | mddev->layout = le32_to_cpu(sb->layout); |
1180 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1181 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1182 | mddev->events = ev1; |
9223214e | 1183 | mddev->bitmap_offset = 0; |
29fc7e3e | 1184 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1185 | |
1186 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1187 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1188 | ||
1189 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1190 | |
71c0805c | 1191 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1192 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1193 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1194 | |
f6705578 N |
1195 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1196 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1197 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1198 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1199 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1200 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1201 | } else { | |
1202 | mddev->reshape_position = MaxSector; | |
1203 | mddev->delta_disks = 0; | |
1204 | mddev->new_level = mddev->level; | |
1205 | mddev->new_layout = mddev->layout; | |
1206 | mddev->new_chunk = mddev->chunk_size; | |
1207 | } | |
1208 | ||
41158c7e N |
1209 | } else if (mddev->pers == NULL) { |
1210 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1211 | ++ev1; |
1212 | if (ev1 < mddev->events) | |
1213 | return -EINVAL; | |
41158c7e N |
1214 | } else if (mddev->bitmap) { |
1215 | /* If adding to array with a bitmap, then we can accept an | |
1216 | * older device, but not too old. | |
1217 | */ | |
41158c7e N |
1218 | if (ev1 < mddev->bitmap->events_cleared) |
1219 | return 0; | |
07d84d10 N |
1220 | } else { |
1221 | if (ev1 < mddev->events) | |
1222 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1223 | return 0; | |
1224 | } | |
1da177e4 LT |
1225 | if (mddev->level != LEVEL_MULTIPATH) { |
1226 | int role; | |
1da177e4 LT |
1227 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1228 | switch(role) { | |
1229 | case 0xffff: /* spare */ | |
1da177e4 LT |
1230 | break; |
1231 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1232 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1233 | break; |
1234 | default: | |
5fd6c1dc N |
1235 | if ((le32_to_cpu(sb->feature_map) & |
1236 | MD_FEATURE_RECOVERY_OFFSET)) | |
1237 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1238 | else | |
1239 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1240 | rdev->raid_disk = role; |
1241 | break; | |
1242 | } | |
8ddf9efe N |
1243 | if (sb->devflags & WriteMostly1) |
1244 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1245 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1246 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1247 | |
1da177e4 LT |
1248 | return 0; |
1249 | } | |
1250 | ||
1251 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1252 | { | |
1253 | struct mdp_superblock_1 *sb; | |
1254 | struct list_head *tmp; | |
1255 | mdk_rdev_t *rdev2; | |
1256 | int max_dev, i; | |
1257 | /* make rdev->sb match mddev and rdev data. */ | |
1258 | ||
1259 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1260 | ||
1261 | sb->feature_map = 0; | |
1262 | sb->pad0 = 0; | |
5fd6c1dc | 1263 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1264 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1265 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1266 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1267 | ||
1268 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1269 | sb->events = cpu_to_le64(mddev->events); | |
1270 | if (mddev->in_sync) | |
1271 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1272 | else | |
1273 | sb->resync_offset = cpu_to_le64(0); | |
1274 | ||
1c05b4bc | 1275 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1276 | |
f0ca340c | 1277 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1278 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1279 | |
a654b9d8 N |
1280 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1281 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1282 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1283 | } |
5fd6c1dc N |
1284 | |
1285 | if (rdev->raid_disk >= 0 && | |
1286 | !test_bit(In_sync, &rdev->flags) && | |
1287 | rdev->recovery_offset > 0) { | |
1288 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1289 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1290 | } | |
1291 | ||
f6705578 N |
1292 | if (mddev->reshape_position != MaxSector) { |
1293 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1294 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1295 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1296 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1297 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1298 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1299 | } | |
a654b9d8 | 1300 | |
1da177e4 | 1301 | max_dev = 0; |
d089c6af | 1302 | rdev_for_each(rdev2, tmp, mddev) |
1da177e4 LT |
1303 | if (rdev2->desc_nr+1 > max_dev) |
1304 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1305 | |
1306 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1307 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1308 | for (i=0; i<max_dev;i++) |
1309 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1310 | ||
d089c6af | 1311 | rdev_for_each(rdev2, tmp, mddev) { |
1da177e4 | 1312 | i = rdev2->desc_nr; |
b2d444d7 | 1313 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1314 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1315 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1316 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1317 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1318 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1319 | else |
1320 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1321 | } | |
1322 | ||
1da177e4 LT |
1323 | sb->sb_csum = calc_sb_1_csum(sb); |
1324 | } | |
1325 | ||
1326 | ||
75c96f85 | 1327 | static struct super_type super_types[] = { |
1da177e4 LT |
1328 | [0] = { |
1329 | .name = "0.90.0", | |
1330 | .owner = THIS_MODULE, | |
1331 | .load_super = super_90_load, | |
1332 | .validate_super = super_90_validate, | |
1333 | .sync_super = super_90_sync, | |
1334 | }, | |
1335 | [1] = { | |
1336 | .name = "md-1", | |
1337 | .owner = THIS_MODULE, | |
1338 | .load_super = super_1_load, | |
1339 | .validate_super = super_1_validate, | |
1340 | .sync_super = super_1_sync, | |
1341 | }, | |
1342 | }; | |
1da177e4 LT |
1343 | |
1344 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1345 | { | |
7dd5e7c3 N |
1346 | struct list_head *tmp, *tmp2; |
1347 | mdk_rdev_t *rdev, *rdev2; | |
1da177e4 | 1348 | |
d089c6af N |
1349 | rdev_for_each(rdev, tmp, mddev1) |
1350 | rdev_for_each(rdev2, tmp2, mddev2) | |
7dd5e7c3 N |
1351 | if (rdev->bdev->bd_contains == |
1352 | rdev2->bdev->bd_contains) | |
1353 | return 1; | |
1da177e4 LT |
1354 | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | static LIST_HEAD(pending_raid_disks); | |
1359 | ||
1360 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1361 | { | |
7dd5e7c3 | 1362 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1363 | struct kobject *ko; |
1edf80d3 | 1364 | char *s; |
5e55e2f5 | 1365 | int err; |
1da177e4 LT |
1366 | |
1367 | if (rdev->mddev) { | |
1368 | MD_BUG(); | |
1369 | return -EINVAL; | |
1370 | } | |
2bf071bf N |
1371 | /* make sure rdev->size exceeds mddev->size */ |
1372 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1373 | if (mddev->pers) { |
1374 | /* Cannot change size, so fail | |
1375 | * If mddev->level <= 0, then we don't care | |
1376 | * about aligning sizes (e.g. linear) | |
1377 | */ | |
1378 | if (mddev->level > 0) | |
1379 | return -ENOSPC; | |
1380 | } else | |
2bf071bf N |
1381 | mddev->size = rdev->size; |
1382 | } | |
1da177e4 LT |
1383 | |
1384 | /* Verify rdev->desc_nr is unique. | |
1385 | * If it is -1, assign a free number, else | |
1386 | * check number is not in use | |
1387 | */ | |
1388 | if (rdev->desc_nr < 0) { | |
1389 | int choice = 0; | |
1390 | if (mddev->pers) choice = mddev->raid_disks; | |
1391 | while (find_rdev_nr(mddev, choice)) | |
1392 | choice++; | |
1393 | rdev->desc_nr = choice; | |
1394 | } else { | |
1395 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1396 | return -EBUSY; | |
1397 | } | |
19133a42 | 1398 | bdevname(rdev->bdev,b); |
649316b2 | 1399 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1400 | *s = '!'; |
649316b2 | 1401 | |
1da177e4 | 1402 | rdev->mddev = mddev; |
19133a42 | 1403 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1404 | |
b2d6db58 | 1405 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1406 | goto fail; |
86e6ffdd | 1407 | |
f637b9f9 | 1408 | if (rdev->bdev->bd_part) |
edfaa7c3 | 1409 | ko = &rdev->bdev->bd_part->dev.kobj; |
f637b9f9 | 1410 | else |
edfaa7c3 | 1411 | ko = &rdev->bdev->bd_disk->dev.kobj; |
5e55e2f5 N |
1412 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1413 | kobject_del(&rdev->kobj); | |
1414 | goto fail; | |
1415 | } | |
1416 | list_add(&rdev->same_set, &mddev->disks); | |
c5d79adb | 1417 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
1da177e4 | 1418 | return 0; |
5e55e2f5 N |
1419 | |
1420 | fail: | |
1421 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1422 | b, mdname(mddev)); | |
1423 | return err; | |
1da177e4 LT |
1424 | } |
1425 | ||
177a99b2 | 1426 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1427 | { |
1428 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1429 | kobject_del(&rdev->kobj); | |
177a99b2 | 1430 | kobject_put(&rdev->kobj); |
5792a285 N |
1431 | } |
1432 | ||
1da177e4 LT |
1433 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1434 | { | |
1435 | char b[BDEVNAME_SIZE]; | |
1436 | if (!rdev->mddev) { | |
1437 | MD_BUG(); | |
1438 | return; | |
1439 | } | |
5463c790 | 1440 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
1da177e4 LT |
1441 | list_del_init(&rdev->same_set); |
1442 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1443 | rdev->mddev = NULL; | |
86e6ffdd | 1444 | sysfs_remove_link(&rdev->kobj, "block"); |
5792a285 N |
1445 | |
1446 | /* We need to delay this, otherwise we can deadlock when | |
1447 | * writing to 'remove' to "dev/state" | |
1448 | */ | |
177a99b2 N |
1449 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1450 | kobject_get(&rdev->kobj); | |
5792a285 | 1451 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1452 | } |
1453 | ||
1454 | /* | |
1455 | * prevent the device from being mounted, repartitioned or | |
1456 | * otherwise reused by a RAID array (or any other kernel | |
1457 | * subsystem), by bd_claiming the device. | |
1458 | */ | |
c5d79adb | 1459 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1460 | { |
1461 | int err = 0; | |
1462 | struct block_device *bdev; | |
1463 | char b[BDEVNAME_SIZE]; | |
1464 | ||
2e7b651d | 1465 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1466 | if (IS_ERR(bdev)) { |
1467 | printk(KERN_ERR "md: could not open %s.\n", | |
1468 | __bdevname(dev, b)); | |
1469 | return PTR_ERR(bdev); | |
1470 | } | |
c5d79adb | 1471 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1472 | if (err) { |
1473 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1474 | bdevname(bdev, b)); | |
2e7b651d | 1475 | blkdev_put(bdev); |
1da177e4 LT |
1476 | return err; |
1477 | } | |
c5d79adb N |
1478 | if (!shared) |
1479 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1480 | rdev->bdev = bdev; |
1481 | return err; | |
1482 | } | |
1483 | ||
1484 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1485 | { | |
1486 | struct block_device *bdev = rdev->bdev; | |
1487 | rdev->bdev = NULL; | |
1488 | if (!bdev) | |
1489 | MD_BUG(); | |
1490 | bd_release(bdev); | |
2e7b651d | 1491 | blkdev_put(bdev); |
1da177e4 LT |
1492 | } |
1493 | ||
1494 | void md_autodetect_dev(dev_t dev); | |
1495 | ||
1496 | static void export_rdev(mdk_rdev_t * rdev) | |
1497 | { | |
1498 | char b[BDEVNAME_SIZE]; | |
1499 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1500 | bdevname(rdev->bdev,b)); | |
1501 | if (rdev->mddev) | |
1502 | MD_BUG(); | |
1503 | free_disk_sb(rdev); | |
1504 | list_del_init(&rdev->same_set); | |
1505 | #ifndef MODULE | |
d0fae18f N |
1506 | if (test_bit(AutoDetected, &rdev->flags)) |
1507 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1508 | #endif |
1509 | unlock_rdev(rdev); | |
86e6ffdd | 1510 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1511 | } |
1512 | ||
1513 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1514 | { | |
1515 | unbind_rdev_from_array(rdev); | |
1516 | export_rdev(rdev); | |
1517 | } | |
1518 | ||
1519 | static void export_array(mddev_t *mddev) | |
1520 | { | |
1521 | struct list_head *tmp; | |
1522 | mdk_rdev_t *rdev; | |
1523 | ||
d089c6af | 1524 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1525 | if (!rdev->mddev) { |
1526 | MD_BUG(); | |
1527 | continue; | |
1528 | } | |
1529 | kick_rdev_from_array(rdev); | |
1530 | } | |
1531 | if (!list_empty(&mddev->disks)) | |
1532 | MD_BUG(); | |
1533 | mddev->raid_disks = 0; | |
1534 | mddev->major_version = 0; | |
1535 | } | |
1536 | ||
1537 | static void print_desc(mdp_disk_t *desc) | |
1538 | { | |
1539 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1540 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1541 | } | |
1542 | ||
1543 | static void print_sb(mdp_super_t *sb) | |
1544 | { | |
1545 | int i; | |
1546 | ||
1547 | printk(KERN_INFO | |
1548 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1549 | sb->major_version, sb->minor_version, sb->patch_version, | |
1550 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1551 | sb->ctime); | |
1552 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1553 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1554 | sb->md_minor, sb->layout, sb->chunk_size); | |
1555 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1556 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1557 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1558 | sb->failed_disks, sb->spare_disks, | |
1559 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1560 | ||
1561 | printk(KERN_INFO); | |
1562 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1563 | mdp_disk_t *desc; | |
1564 | ||
1565 | desc = sb->disks + i; | |
1566 | if (desc->number || desc->major || desc->minor || | |
1567 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1568 | printk(" D %2d: ", i); | |
1569 | print_desc(desc); | |
1570 | } | |
1571 | } | |
1572 | printk(KERN_INFO "md: THIS: "); | |
1573 | print_desc(&sb->this_disk); | |
1574 | ||
1575 | } | |
1576 | ||
1577 | static void print_rdev(mdk_rdev_t *rdev) | |
1578 | { | |
1579 | char b[BDEVNAME_SIZE]; | |
1580 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1581 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1582 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1583 | rdev->desc_nr); | |
1da177e4 LT |
1584 | if (rdev->sb_loaded) { |
1585 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1586 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1587 | } else | |
1588 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1589 | } | |
1590 | ||
5e56341d | 1591 | static void md_print_devices(void) |
1da177e4 LT |
1592 | { |
1593 | struct list_head *tmp, *tmp2; | |
1594 | mdk_rdev_t *rdev; | |
1595 | mddev_t *mddev; | |
1596 | char b[BDEVNAME_SIZE]; | |
1597 | ||
1598 | printk("\n"); | |
1599 | printk("md: **********************************\n"); | |
1600 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1601 | printk("md: **********************************\n"); | |
29ac4aa3 | 1602 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1603 | |
32a7627c N |
1604 | if (mddev->bitmap) |
1605 | bitmap_print_sb(mddev->bitmap); | |
1606 | else | |
1607 | printk("%s: ", mdname(mddev)); | |
d089c6af | 1608 | rdev_for_each(rdev, tmp2, mddev) |
1da177e4 LT |
1609 | printk("<%s>", bdevname(rdev->bdev,b)); |
1610 | printk("\n"); | |
1611 | ||
d089c6af | 1612 | rdev_for_each(rdev, tmp2, mddev) |
1da177e4 LT |
1613 | print_rdev(rdev); |
1614 | } | |
1615 | printk("md: **********************************\n"); | |
1616 | printk("\n"); | |
1617 | } | |
1618 | ||
1619 | ||
42543769 | 1620 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1621 | { |
42543769 N |
1622 | /* Update each superblock (in-memory image), but |
1623 | * if we are allowed to, skip spares which already | |
1624 | * have the right event counter, or have one earlier | |
1625 | * (which would mean they aren't being marked as dirty | |
1626 | * with the rest of the array) | |
1627 | */ | |
1da177e4 LT |
1628 | mdk_rdev_t *rdev; |
1629 | struct list_head *tmp; | |
1630 | ||
d089c6af | 1631 | rdev_for_each(rdev, tmp, mddev) { |
42543769 N |
1632 | if (rdev->sb_events == mddev->events || |
1633 | (nospares && | |
1634 | rdev->raid_disk < 0 && | |
1635 | (rdev->sb_events&1)==0 && | |
1636 | rdev->sb_events+1 == mddev->events)) { | |
1637 | /* Don't update this superblock */ | |
1638 | rdev->sb_loaded = 2; | |
1639 | } else { | |
1640 | super_types[mddev->major_version]. | |
1641 | sync_super(mddev, rdev); | |
1642 | rdev->sb_loaded = 1; | |
1643 | } | |
1da177e4 LT |
1644 | } |
1645 | } | |
1646 | ||
850b2b42 | 1647 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1648 | { |
1da177e4 LT |
1649 | struct list_head *tmp; |
1650 | mdk_rdev_t *rdev; | |
06d91a5f | 1651 | int sync_req; |
42543769 | 1652 | int nospares = 0; |
1da177e4 | 1653 | |
1da177e4 | 1654 | repeat: |
a9701a30 | 1655 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1656 | |
850b2b42 N |
1657 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1658 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1659 | force_change = 1; | |
1660 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1661 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1662 | * though if events isn't the right even/odd, we will have to do | |
1663 | * spares after all | |
1664 | */ | |
1665 | nospares = 1; | |
1666 | if (force_change) | |
1667 | nospares = 0; | |
1668 | if (mddev->degraded) | |
84692195 N |
1669 | /* If the array is degraded, then skipping spares is both |
1670 | * dangerous and fairly pointless. | |
1671 | * Dangerous because a device that was removed from the array | |
1672 | * might have a event_count that still looks up-to-date, | |
1673 | * so it can be re-added without a resync. | |
1674 | * Pointless because if there are any spares to skip, | |
1675 | * then a recovery will happen and soon that array won't | |
1676 | * be degraded any more and the spare can go back to sleep then. | |
1677 | */ | |
850b2b42 | 1678 | nospares = 0; |
84692195 | 1679 | |
06d91a5f | 1680 | sync_req = mddev->in_sync; |
1da177e4 | 1681 | mddev->utime = get_seconds(); |
42543769 N |
1682 | |
1683 | /* If this is just a dirty<->clean transition, and the array is clean | |
1684 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1685 | if (nospares |
42543769 | 1686 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1687 | && (mddev->events & 1) |
1688 | && mddev->events != 1) | |
42543769 N |
1689 | mddev->events--; |
1690 | else { | |
1691 | /* otherwise we have to go forward and ... */ | |
1692 | mddev->events ++; | |
1693 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1694 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1695 | if ((mddev->events&1)==0) { | |
1696 | mddev->events++; | |
1697 | nospares = 0; | |
1698 | } | |
1699 | } else { | |
1700 | /* otherwise insist on an even 'events' (for clean states) */ | |
1701 | if ((mddev->events&1)) { | |
1702 | mddev->events++; | |
1703 | nospares = 0; | |
1704 | } | |
1705 | } | |
1706 | } | |
1da177e4 LT |
1707 | |
1708 | if (!mddev->events) { | |
1709 | /* | |
1710 | * oops, this 64-bit counter should never wrap. | |
1711 | * Either we are in around ~1 trillion A.C., assuming | |
1712 | * 1 reboot per second, or we have a bug: | |
1713 | */ | |
1714 | MD_BUG(); | |
1715 | mddev->events --; | |
1716 | } | |
1da177e4 LT |
1717 | |
1718 | /* | |
1719 | * do not write anything to disk if using | |
1720 | * nonpersistent superblocks | |
1721 | */ | |
06d91a5f | 1722 | if (!mddev->persistent) { |
e691063a N |
1723 | if (!mddev->external) |
1724 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1725 | ||
a9701a30 | 1726 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1727 | wake_up(&mddev->sb_wait); |
1da177e4 | 1728 | return; |
06d91a5f | 1729 | } |
e691063a | 1730 | sync_sbs(mddev, nospares); |
a9701a30 | 1731 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1732 | |
1733 | dprintk(KERN_INFO | |
1734 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1735 | mdname(mddev),mddev->in_sync); | |
1736 | ||
4ad13663 | 1737 | bitmap_update_sb(mddev->bitmap); |
d089c6af | 1738 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1739 | char b[BDEVNAME_SIZE]; |
1740 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1741 | if (rdev->sb_loaded != 1) |
1742 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1743 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1744 | dprintk("(skipping faulty "); |
1745 | ||
1746 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1747 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1748 | md_super_write(mddev,rdev, |
0002b271 | 1749 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1750 | rdev->sb_page); |
1751 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1752 | bdevname(rdev->bdev,b), | |
1753 | (unsigned long long)rdev->sb_offset); | |
42543769 | 1754 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1755 | |
1da177e4 LT |
1756 | } else |
1757 | dprintk(")\n"); | |
7bfa19f2 | 1758 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1759 | /* only need to write one superblock... */ |
1760 | break; | |
1761 | } | |
a9701a30 | 1762 | md_super_wait(mddev); |
850b2b42 | 1763 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1764 | |
a9701a30 | 1765 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1766 | if (mddev->in_sync != sync_req || |
1767 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1768 | /* have to write it out again */ |
a9701a30 | 1769 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1770 | goto repeat; |
1771 | } | |
850b2b42 | 1772 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1773 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1774 | wake_up(&mddev->sb_wait); |
06d91a5f | 1775 | |
1da177e4 LT |
1776 | } |
1777 | ||
bce74dac N |
1778 | /* words written to sysfs files may, or my not, be \n terminated. |
1779 | * We want to accept with case. For this we use cmd_match. | |
1780 | */ | |
1781 | static int cmd_match(const char *cmd, const char *str) | |
1782 | { | |
1783 | /* See if cmd, written into a sysfs file, matches | |
1784 | * str. They must either be the same, or cmd can | |
1785 | * have a trailing newline | |
1786 | */ | |
1787 | while (*cmd && *str && *cmd == *str) { | |
1788 | cmd++; | |
1789 | str++; | |
1790 | } | |
1791 | if (*cmd == '\n') | |
1792 | cmd++; | |
1793 | if (*str || *cmd) | |
1794 | return 0; | |
1795 | return 1; | |
1796 | } | |
1797 | ||
86e6ffdd N |
1798 | struct rdev_sysfs_entry { |
1799 | struct attribute attr; | |
1800 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1801 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1802 | }; | |
1803 | ||
1804 | static ssize_t | |
96de1e66 | 1805 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1806 | { |
1807 | char *sep = ""; | |
20a49ff6 | 1808 | size_t len = 0; |
86e6ffdd | 1809 | |
b2d444d7 | 1810 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1811 | len+= sprintf(page+len, "%sfaulty",sep); |
1812 | sep = ","; | |
1813 | } | |
b2d444d7 | 1814 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1815 | len += sprintf(page+len, "%sin_sync",sep); |
1816 | sep = ","; | |
1817 | } | |
f655675b N |
1818 | if (test_bit(WriteMostly, &rdev->flags)) { |
1819 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1820 | sep = ","; | |
1821 | } | |
b2d444d7 N |
1822 | if (!test_bit(Faulty, &rdev->flags) && |
1823 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1824 | len += sprintf(page+len, "%sspare", sep); |
1825 | sep = ","; | |
1826 | } | |
1827 | return len+sprintf(page+len, "\n"); | |
1828 | } | |
1829 | ||
45dc2de1 N |
1830 | static ssize_t |
1831 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1832 | { | |
1833 | /* can write | |
1834 | * faulty - simulates and error | |
1835 | * remove - disconnects the device | |
f655675b N |
1836 | * writemostly - sets write_mostly |
1837 | * -writemostly - clears write_mostly | |
45dc2de1 N |
1838 | */ |
1839 | int err = -EINVAL; | |
1840 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1841 | md_error(rdev->mddev, rdev); | |
1842 | err = 0; | |
1843 | } else if (cmd_match(buf, "remove")) { | |
1844 | if (rdev->raid_disk >= 0) | |
1845 | err = -EBUSY; | |
1846 | else { | |
1847 | mddev_t *mddev = rdev->mddev; | |
1848 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1849 | if (mddev->pers) |
1850 | md_update_sb(mddev, 1); | |
45dc2de1 N |
1851 | md_new_event(mddev); |
1852 | err = 0; | |
1853 | } | |
f655675b N |
1854 | } else if (cmd_match(buf, "writemostly")) { |
1855 | set_bit(WriteMostly, &rdev->flags); | |
1856 | err = 0; | |
1857 | } else if (cmd_match(buf, "-writemostly")) { | |
1858 | clear_bit(WriteMostly, &rdev->flags); | |
1859 | err = 0; | |
45dc2de1 N |
1860 | } |
1861 | return err ? err : len; | |
1862 | } | |
80ca3a44 N |
1863 | static struct rdev_sysfs_entry rdev_state = |
1864 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 1865 | |
4dbcdc75 N |
1866 | static ssize_t |
1867 | errors_show(mdk_rdev_t *rdev, char *page) | |
1868 | { | |
1869 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1870 | } | |
1871 | ||
1872 | static ssize_t | |
1873 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1874 | { | |
1875 | char *e; | |
1876 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1877 | if (*buf && (*e == 0 || *e == '\n')) { | |
1878 | atomic_set(&rdev->corrected_errors, n); | |
1879 | return len; | |
1880 | } | |
1881 | return -EINVAL; | |
1882 | } | |
1883 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 1884 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 1885 | |
014236d2 N |
1886 | static ssize_t |
1887 | slot_show(mdk_rdev_t *rdev, char *page) | |
1888 | { | |
1889 | if (rdev->raid_disk < 0) | |
1890 | return sprintf(page, "none\n"); | |
1891 | else | |
1892 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1893 | } | |
1894 | ||
1895 | static ssize_t | |
1896 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1897 | { | |
1898 | char *e; | |
c303da6d N |
1899 | int err; |
1900 | char nm[20]; | |
014236d2 N |
1901 | int slot = simple_strtoul(buf, &e, 10); |
1902 | if (strncmp(buf, "none", 4)==0) | |
1903 | slot = -1; | |
1904 | else if (e==buf || (*e && *e!= '\n')) | |
1905 | return -EINVAL; | |
c303da6d N |
1906 | if (rdev->mddev->pers) { |
1907 | /* Setting 'slot' on an active array requires also | |
1908 | * updating the 'rd%d' link, and communicating | |
1909 | * with the personality with ->hot_*_disk. | |
1910 | * For now we only support removing | |
1911 | * failed/spare devices. This normally happens automatically, | |
1912 | * but not when the metadata is externally managed. | |
1913 | */ | |
1914 | if (slot != -1) | |
1915 | return -EBUSY; | |
1916 | if (rdev->raid_disk == -1) | |
1917 | return -EEXIST; | |
1918 | /* personality does all needed checks */ | |
1919 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
1920 | return -EINVAL; | |
1921 | err = rdev->mddev->pers-> | |
1922 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
1923 | if (err) | |
1924 | return err; | |
1925 | sprintf(nm, "rd%d", rdev->raid_disk); | |
1926 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
1927 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
1928 | md_wakeup_thread(rdev->mddev->thread); | |
1929 | } else { | |
1930 | if (slot >= rdev->mddev->raid_disks) | |
1931 | return -ENOSPC; | |
1932 | rdev->raid_disk = slot; | |
1933 | /* assume it is working */ | |
c5d79adb N |
1934 | clear_bit(Faulty, &rdev->flags); |
1935 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d N |
1936 | set_bit(In_sync, &rdev->flags); |
1937 | } | |
014236d2 N |
1938 | return len; |
1939 | } | |
1940 | ||
1941 | ||
1942 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 1943 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 1944 | |
93c8cad0 N |
1945 | static ssize_t |
1946 | offset_show(mdk_rdev_t *rdev, char *page) | |
1947 | { | |
6961ece4 | 1948 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
1949 | } |
1950 | ||
1951 | static ssize_t | |
1952 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1953 | { | |
1954 | char *e; | |
1955 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
1956 | if (e==buf || (*e && *e != '\n')) | |
1957 | return -EINVAL; | |
1958 | if (rdev->mddev->pers) | |
1959 | return -EBUSY; | |
c5d79adb N |
1960 | if (rdev->size && rdev->mddev->external) |
1961 | /* Must set offset before size, so overlap checks | |
1962 | * can be sane */ | |
1963 | return -EBUSY; | |
93c8cad0 N |
1964 | rdev->data_offset = offset; |
1965 | return len; | |
1966 | } | |
1967 | ||
1968 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 1969 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 1970 | |
83303b61 N |
1971 | static ssize_t |
1972 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
1973 | { | |
1974 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
1975 | } | |
1976 | ||
c5d79adb N |
1977 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
1978 | { | |
1979 | /* check if two start/length pairs overlap */ | |
1980 | if (s1+l1 <= s2) | |
1981 | return 0; | |
1982 | if (s2+l2 <= s1) | |
1983 | return 0; | |
1984 | return 1; | |
1985 | } | |
1986 | ||
83303b61 N |
1987 | static ssize_t |
1988 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1989 | { | |
1990 | char *e; | |
1991 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
c5d79adb | 1992 | unsigned long long oldsize = rdev->size; |
27c529bb N |
1993 | mddev_t *my_mddev = rdev->mddev; |
1994 | ||
83303b61 N |
1995 | if (e==buf || (*e && *e != '\n')) |
1996 | return -EINVAL; | |
27c529bb | 1997 | if (my_mddev->pers) |
83303b61 N |
1998 | return -EBUSY; |
1999 | rdev->size = size; | |
c5d79adb N |
2000 | if (size > oldsize && rdev->mddev->external) { |
2001 | /* need to check that all other rdevs with the same ->bdev | |
2002 | * do not overlap. We need to unlock the mddev to avoid | |
2003 | * a deadlock. We have already changed rdev->size, and if | |
2004 | * we have to change it back, we will have the lock again. | |
2005 | */ | |
2006 | mddev_t *mddev; | |
2007 | int overlap = 0; | |
2008 | struct list_head *tmp, *tmp2; | |
2009 | ||
27c529bb | 2010 | mddev_unlock(my_mddev); |
29ac4aa3 | 2011 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2012 | mdk_rdev_t *rdev2; |
2013 | ||
2014 | mddev_lock(mddev); | |
d089c6af | 2015 | rdev_for_each(rdev2, tmp2, mddev) |
c5d79adb N |
2016 | if (test_bit(AllReserved, &rdev2->flags) || |
2017 | (rdev->bdev == rdev2->bdev && | |
2018 | rdev != rdev2 && | |
2019 | overlaps(rdev->data_offset, rdev->size, | |
2020 | rdev2->data_offset, rdev2->size))) { | |
2021 | overlap = 1; | |
2022 | break; | |
2023 | } | |
2024 | mddev_unlock(mddev); | |
2025 | if (overlap) { | |
2026 | mddev_put(mddev); | |
2027 | break; | |
2028 | } | |
2029 | } | |
27c529bb | 2030 | mddev_lock(my_mddev); |
c5d79adb N |
2031 | if (overlap) { |
2032 | /* Someone else could have slipped in a size | |
2033 | * change here, but doing so is just silly. | |
2034 | * We put oldsize back because we *know* it is | |
2035 | * safe, and trust userspace not to race with | |
2036 | * itself | |
2037 | */ | |
2038 | rdev->size = oldsize; | |
2039 | return -EBUSY; | |
2040 | } | |
2041 | } | |
27c529bb N |
2042 | if (size < my_mddev->size || my_mddev->size == 0) |
2043 | my_mddev->size = size; | |
83303b61 N |
2044 | return len; |
2045 | } | |
2046 | ||
2047 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2048 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2049 | |
86e6ffdd N |
2050 | static struct attribute *rdev_default_attrs[] = { |
2051 | &rdev_state.attr, | |
4dbcdc75 | 2052 | &rdev_errors.attr, |
014236d2 | 2053 | &rdev_slot.attr, |
93c8cad0 | 2054 | &rdev_offset.attr, |
83303b61 | 2055 | &rdev_size.attr, |
86e6ffdd N |
2056 | NULL, |
2057 | }; | |
2058 | static ssize_t | |
2059 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2060 | { | |
2061 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2062 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2063 | mddev_t *mddev = rdev->mddev; |
2064 | ssize_t rv; | |
86e6ffdd N |
2065 | |
2066 | if (!entry->show) | |
2067 | return -EIO; | |
27c529bb N |
2068 | |
2069 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2070 | if (!rv) { | |
2071 | if (rdev->mddev == NULL) | |
2072 | rv = -EBUSY; | |
2073 | else | |
2074 | rv = entry->show(rdev, page); | |
2075 | mddev_unlock(mddev); | |
2076 | } | |
2077 | return rv; | |
86e6ffdd N |
2078 | } |
2079 | ||
2080 | static ssize_t | |
2081 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2082 | const char *page, size_t length) | |
2083 | { | |
2084 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2085 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2086 | ssize_t rv; |
2087 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2088 | |
2089 | if (!entry->store) | |
2090 | return -EIO; | |
67463acb N |
2091 | if (!capable(CAP_SYS_ADMIN)) |
2092 | return -EACCES; | |
27c529bb | 2093 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2094 | if (!rv) { |
27c529bb N |
2095 | if (rdev->mddev == NULL) |
2096 | rv = -EBUSY; | |
2097 | else | |
2098 | rv = entry->store(rdev, page, length); | |
ca388059 N |
2099 | mddev_unlock(rdev->mddev); |
2100 | } | |
2101 | return rv; | |
86e6ffdd N |
2102 | } |
2103 | ||
2104 | static void rdev_free(struct kobject *ko) | |
2105 | { | |
2106 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2107 | kfree(rdev); | |
2108 | } | |
2109 | static struct sysfs_ops rdev_sysfs_ops = { | |
2110 | .show = rdev_attr_show, | |
2111 | .store = rdev_attr_store, | |
2112 | }; | |
2113 | static struct kobj_type rdev_ktype = { | |
2114 | .release = rdev_free, | |
2115 | .sysfs_ops = &rdev_sysfs_ops, | |
2116 | .default_attrs = rdev_default_attrs, | |
2117 | }; | |
2118 | ||
1da177e4 LT |
2119 | /* |
2120 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2121 | * | |
2122 | * mark the device faulty if: | |
2123 | * | |
2124 | * - the device is nonexistent (zero size) | |
2125 | * - the device has no valid superblock | |
2126 | * | |
2127 | * a faulty rdev _never_ has rdev->sb set. | |
2128 | */ | |
2129 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2130 | { | |
2131 | char b[BDEVNAME_SIZE]; | |
2132 | int err; | |
2133 | mdk_rdev_t *rdev; | |
2134 | sector_t size; | |
2135 | ||
9ffae0cf | 2136 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2137 | if (!rdev) { |
2138 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2139 | return ERR_PTR(-ENOMEM); | |
2140 | } | |
1da177e4 LT |
2141 | |
2142 | if ((err = alloc_disk_sb(rdev))) | |
2143 | goto abort_free; | |
2144 | ||
c5d79adb | 2145 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2146 | if (err) |
2147 | goto abort_free; | |
2148 | ||
f9cb074b | 2149 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2150 | |
1da177e4 | 2151 | rdev->desc_nr = -1; |
2b6e8459 | 2152 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2153 | rdev->raid_disk = -1; |
b2d444d7 | 2154 | rdev->flags = 0; |
1da177e4 | 2155 | rdev->data_offset = 0; |
42543769 | 2156 | rdev->sb_events = 0; |
1da177e4 | 2157 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2158 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2159 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2160 | |
2161 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2162 | if (!size) { | |
2163 | printk(KERN_WARNING | |
2164 | "md: %s has zero or unknown size, marking faulty!\n", | |
2165 | bdevname(rdev->bdev,b)); | |
2166 | err = -EINVAL; | |
2167 | goto abort_free; | |
2168 | } | |
2169 | ||
2170 | if (super_format >= 0) { | |
2171 | err = super_types[super_format]. | |
2172 | load_super(rdev, NULL, super_minor); | |
2173 | if (err == -EINVAL) { | |
df968c4e N |
2174 | printk(KERN_WARNING |
2175 | "md: %s does not have a valid v%d.%d " | |
2176 | "superblock, not importing!\n", | |
2177 | bdevname(rdev->bdev,b), | |
2178 | super_format, super_minor); | |
1da177e4 LT |
2179 | goto abort_free; |
2180 | } | |
2181 | if (err < 0) { | |
2182 | printk(KERN_WARNING | |
2183 | "md: could not read %s's sb, not importing!\n", | |
2184 | bdevname(rdev->bdev,b)); | |
2185 | goto abort_free; | |
2186 | } | |
2187 | } | |
2188 | INIT_LIST_HEAD(&rdev->same_set); | |
2189 | ||
2190 | return rdev; | |
2191 | ||
2192 | abort_free: | |
2193 | if (rdev->sb_page) { | |
2194 | if (rdev->bdev) | |
2195 | unlock_rdev(rdev); | |
2196 | free_disk_sb(rdev); | |
2197 | } | |
2198 | kfree(rdev); | |
2199 | return ERR_PTR(err); | |
2200 | } | |
2201 | ||
2202 | /* | |
2203 | * Check a full RAID array for plausibility | |
2204 | */ | |
2205 | ||
2206 | ||
a757e64c | 2207 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2208 | { |
2209 | int i; | |
2210 | struct list_head *tmp; | |
2211 | mdk_rdev_t *rdev, *freshest; | |
2212 | char b[BDEVNAME_SIZE]; | |
2213 | ||
2214 | freshest = NULL; | |
d089c6af | 2215 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2216 | switch (super_types[mddev->major_version]. |
2217 | load_super(rdev, freshest, mddev->minor_version)) { | |
2218 | case 1: | |
2219 | freshest = rdev; | |
2220 | break; | |
2221 | case 0: | |
2222 | break; | |
2223 | default: | |
2224 | printk( KERN_ERR \ | |
2225 | "md: fatal superblock inconsistency in %s" | |
2226 | " -- removing from array\n", | |
2227 | bdevname(rdev->bdev,b)); | |
2228 | kick_rdev_from_array(rdev); | |
2229 | } | |
2230 | ||
2231 | ||
2232 | super_types[mddev->major_version]. | |
2233 | validate_super(mddev, freshest); | |
2234 | ||
2235 | i = 0; | |
d089c6af | 2236 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2237 | if (rdev != freshest) |
2238 | if (super_types[mddev->major_version]. | |
2239 | validate_super(mddev, rdev)) { | |
2240 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2241 | " from array!\n", | |
2242 | bdevname(rdev->bdev,b)); | |
2243 | kick_rdev_from_array(rdev); | |
2244 | continue; | |
2245 | } | |
2246 | if (mddev->level == LEVEL_MULTIPATH) { | |
2247 | rdev->desc_nr = i++; | |
2248 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2249 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2250 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2251 | rdev->raid_disk = -1; | |
2252 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2253 | } |
2254 | } | |
2255 | ||
2256 | ||
2257 | ||
2258 | if (mddev->recovery_cp != MaxSector && | |
2259 | mddev->level >= 1) | |
2260 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2261 | " -- starting background reconstruction\n", | |
2262 | mdname(mddev)); | |
2263 | ||
1da177e4 LT |
2264 | } |
2265 | ||
16f17b39 N |
2266 | static ssize_t |
2267 | safe_delay_show(mddev_t *mddev, char *page) | |
2268 | { | |
2269 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2270 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2271 | } | |
2272 | static ssize_t | |
2273 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2274 | { | |
2275 | int scale=1; | |
2276 | int dot=0; | |
2277 | int i; | |
2278 | unsigned long msec; | |
2279 | char buf[30]; | |
2280 | char *e; | |
2281 | /* remove a period, and count digits after it */ | |
2282 | if (len >= sizeof(buf)) | |
2283 | return -EINVAL; | |
2284 | strlcpy(buf, cbuf, len); | |
2285 | buf[len] = 0; | |
2286 | for (i=0; i<len; i++) { | |
2287 | if (dot) { | |
2288 | if (isdigit(buf[i])) { | |
2289 | buf[i-1] = buf[i]; | |
2290 | scale *= 10; | |
2291 | } | |
2292 | buf[i] = 0; | |
2293 | } else if (buf[i] == '.') { | |
2294 | dot=1; | |
2295 | buf[i] = 0; | |
2296 | } | |
2297 | } | |
2298 | msec = simple_strtoul(buf, &e, 10); | |
2299 | if (e == buf || (*e && *e != '\n')) | |
2300 | return -EINVAL; | |
2301 | msec = (msec * 1000) / scale; | |
2302 | if (msec == 0) | |
2303 | mddev->safemode_delay = 0; | |
2304 | else { | |
2305 | mddev->safemode_delay = (msec*HZ)/1000; | |
2306 | if (mddev->safemode_delay == 0) | |
2307 | mddev->safemode_delay = 1; | |
2308 | } | |
2309 | return len; | |
2310 | } | |
2311 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2312 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2313 | |
eae1701f | 2314 | static ssize_t |
96de1e66 | 2315 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2316 | { |
2604b703 | 2317 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2318 | if (p) |
eae1701f | 2319 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2320 | else if (mddev->clevel[0]) |
2321 | return sprintf(page, "%s\n", mddev->clevel); | |
2322 | else if (mddev->level != LEVEL_NONE) | |
2323 | return sprintf(page, "%d\n", mddev->level); | |
2324 | else | |
2325 | return 0; | |
eae1701f N |
2326 | } |
2327 | ||
d9d166c2 N |
2328 | static ssize_t |
2329 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2330 | { | |
20a49ff6 | 2331 | ssize_t rv = len; |
d9d166c2 N |
2332 | if (mddev->pers) |
2333 | return -EBUSY; | |
2334 | if (len == 0) | |
2335 | return 0; | |
2336 | if (len >= sizeof(mddev->clevel)) | |
2337 | return -ENOSPC; | |
2338 | strncpy(mddev->clevel, buf, len); | |
2339 | if (mddev->clevel[len-1] == '\n') | |
2340 | len--; | |
2341 | mddev->clevel[len] = 0; | |
2342 | mddev->level = LEVEL_NONE; | |
2343 | return rv; | |
2344 | } | |
2345 | ||
2346 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2347 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2348 | |
d4dbd025 N |
2349 | |
2350 | static ssize_t | |
2351 | layout_show(mddev_t *mddev, char *page) | |
2352 | { | |
2353 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2354 | if (mddev->reshape_position != MaxSector && |
2355 | mddev->layout != mddev->new_layout) | |
2356 | return sprintf(page, "%d (%d)\n", | |
2357 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2358 | return sprintf(page, "%d\n", mddev->layout); |
2359 | } | |
2360 | ||
2361 | static ssize_t | |
2362 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2363 | { | |
2364 | char *e; | |
2365 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2366 | |
2367 | if (!*buf || (*e && *e != '\n')) | |
2368 | return -EINVAL; | |
2369 | ||
08a02ecd N |
2370 | if (mddev->pers) |
2371 | return -EBUSY; | |
2372 | if (mddev->reshape_position != MaxSector) | |
2373 | mddev->new_layout = n; | |
2374 | else | |
2375 | mddev->layout = n; | |
d4dbd025 N |
2376 | return len; |
2377 | } | |
2378 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2379 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2380 | |
2381 | ||
eae1701f | 2382 | static ssize_t |
96de1e66 | 2383 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2384 | { |
bb636547 N |
2385 | if (mddev->raid_disks == 0) |
2386 | return 0; | |
08a02ecd N |
2387 | if (mddev->reshape_position != MaxSector && |
2388 | mddev->delta_disks != 0) | |
2389 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2390 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2391 | return sprintf(page, "%d\n", mddev->raid_disks); |
2392 | } | |
2393 | ||
da943b99 N |
2394 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2395 | ||
2396 | static ssize_t | |
2397 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2398 | { | |
da943b99 N |
2399 | char *e; |
2400 | int rv = 0; | |
2401 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2402 | ||
2403 | if (!*buf || (*e && *e != '\n')) | |
2404 | return -EINVAL; | |
2405 | ||
2406 | if (mddev->pers) | |
2407 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2408 | else if (mddev->reshape_position != MaxSector) { |
2409 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2410 | mddev->delta_disks = n - olddisks; | |
2411 | mddev->raid_disks = n; | |
2412 | } else | |
da943b99 N |
2413 | mddev->raid_disks = n; |
2414 | return rv ? rv : len; | |
2415 | } | |
2416 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2417 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2418 | |
3b34380a N |
2419 | static ssize_t |
2420 | chunk_size_show(mddev_t *mddev, char *page) | |
2421 | { | |
08a02ecd N |
2422 | if (mddev->reshape_position != MaxSector && |
2423 | mddev->chunk_size != mddev->new_chunk) | |
2424 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2425 | mddev->chunk_size); | |
3b34380a N |
2426 | return sprintf(page, "%d\n", mddev->chunk_size); |
2427 | } | |
2428 | ||
2429 | static ssize_t | |
2430 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2431 | { | |
2432 | /* can only set chunk_size if array is not yet active */ | |
2433 | char *e; | |
2434 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2435 | ||
3b34380a N |
2436 | if (!*buf || (*e && *e != '\n')) |
2437 | return -EINVAL; | |
2438 | ||
08a02ecd N |
2439 | if (mddev->pers) |
2440 | return -EBUSY; | |
2441 | else if (mddev->reshape_position != MaxSector) | |
2442 | mddev->new_chunk = n; | |
2443 | else | |
2444 | mddev->chunk_size = n; | |
3b34380a N |
2445 | return len; |
2446 | } | |
2447 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2448 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2449 | |
a94213b1 N |
2450 | static ssize_t |
2451 | resync_start_show(mddev_t *mddev, char *page) | |
2452 | { | |
2453 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2454 | } | |
2455 | ||
2456 | static ssize_t | |
2457 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2458 | { | |
2459 | /* can only set chunk_size if array is not yet active */ | |
2460 | char *e; | |
2461 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2462 | ||
2463 | if (mddev->pers) | |
2464 | return -EBUSY; | |
2465 | if (!*buf || (*e && *e != '\n')) | |
2466 | return -EINVAL; | |
2467 | ||
2468 | mddev->recovery_cp = n; | |
2469 | return len; | |
2470 | } | |
2471 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2472 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2473 | |
9e653b63 N |
2474 | /* |
2475 | * The array state can be: | |
2476 | * | |
2477 | * clear | |
2478 | * No devices, no size, no level | |
2479 | * Equivalent to STOP_ARRAY ioctl | |
2480 | * inactive | |
2481 | * May have some settings, but array is not active | |
2482 | * all IO results in error | |
2483 | * When written, doesn't tear down array, but just stops it | |
2484 | * suspended (not supported yet) | |
2485 | * All IO requests will block. The array can be reconfigured. | |
2486 | * Writing this, if accepted, will block until array is quiessent | |
2487 | * readonly | |
2488 | * no resync can happen. no superblocks get written. | |
2489 | * write requests fail | |
2490 | * read-auto | |
2491 | * like readonly, but behaves like 'clean' on a write request. | |
2492 | * | |
2493 | * clean - no pending writes, but otherwise active. | |
2494 | * When written to inactive array, starts without resync | |
2495 | * If a write request arrives then | |
2496 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2497 | * if not known, block and switch to write-pending | |
2498 | * If written to an active array that has pending writes, then fails. | |
2499 | * active | |
2500 | * fully active: IO and resync can be happening. | |
2501 | * When written to inactive array, starts with resync | |
2502 | * | |
2503 | * write-pending | |
2504 | * clean, but writes are blocked waiting for 'active' to be written. | |
2505 | * | |
2506 | * active-idle | |
2507 | * like active, but no writes have been seen for a while (100msec). | |
2508 | * | |
2509 | */ | |
2510 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2511 | write_pending, active_idle, bad_word}; | |
05381954 | 2512 | static char *array_states[] = { |
9e653b63 N |
2513 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2514 | "write-pending", "active-idle", NULL }; | |
2515 | ||
2516 | static int match_word(const char *word, char **list) | |
2517 | { | |
2518 | int n; | |
2519 | for (n=0; list[n]; n++) | |
2520 | if (cmd_match(word, list[n])) | |
2521 | break; | |
2522 | return n; | |
2523 | } | |
2524 | ||
2525 | static ssize_t | |
2526 | array_state_show(mddev_t *mddev, char *page) | |
2527 | { | |
2528 | enum array_state st = inactive; | |
2529 | ||
2530 | if (mddev->pers) | |
2531 | switch(mddev->ro) { | |
2532 | case 1: | |
2533 | st = readonly; | |
2534 | break; | |
2535 | case 2: | |
2536 | st = read_auto; | |
2537 | break; | |
2538 | case 0: | |
2539 | if (mddev->in_sync) | |
2540 | st = clean; | |
e691063a N |
2541 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2542 | st = write_pending; | |
9e653b63 N |
2543 | else if (mddev->safemode) |
2544 | st = active_idle; | |
2545 | else | |
2546 | st = active; | |
2547 | } | |
2548 | else { | |
2549 | if (list_empty(&mddev->disks) && | |
2550 | mddev->raid_disks == 0 && | |
2551 | mddev->size == 0) | |
2552 | st = clear; | |
2553 | else | |
2554 | st = inactive; | |
2555 | } | |
2556 | return sprintf(page, "%s\n", array_states[st]); | |
2557 | } | |
2558 | ||
2559 | static int do_md_stop(mddev_t * mddev, int ro); | |
2560 | static int do_md_run(mddev_t * mddev); | |
2561 | static int restart_array(mddev_t *mddev); | |
2562 | ||
2563 | static ssize_t | |
2564 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2565 | { | |
2566 | int err = -EINVAL; | |
2567 | enum array_state st = match_word(buf, array_states); | |
2568 | switch(st) { | |
2569 | case bad_word: | |
2570 | break; | |
2571 | case clear: | |
2572 | /* stopping an active array */ | |
e691063a N |
2573 | if (atomic_read(&mddev->active) > 1) |
2574 | return -EBUSY; | |
2575 | err = do_md_stop(mddev, 0); | |
9e653b63 N |
2576 | break; |
2577 | case inactive: | |
2578 | /* stopping an active array */ | |
2579 | if (mddev->pers) { | |
2580 | if (atomic_read(&mddev->active) > 1) | |
2581 | return -EBUSY; | |
2582 | err = do_md_stop(mddev, 2); | |
e691063a N |
2583 | } else |
2584 | err = 0; /* already inactive */ | |
9e653b63 N |
2585 | break; |
2586 | case suspended: | |
2587 | break; /* not supported yet */ | |
2588 | case readonly: | |
2589 | if (mddev->pers) | |
2590 | err = do_md_stop(mddev, 1); | |
2591 | else { | |
2592 | mddev->ro = 1; | |
2593 | err = do_md_run(mddev); | |
2594 | } | |
2595 | break; | |
2596 | case read_auto: | |
2597 | /* stopping an active array */ | |
2598 | if (mddev->pers) { | |
2599 | err = do_md_stop(mddev, 1); | |
2600 | if (err == 0) | |
2601 | mddev->ro = 2; /* FIXME mark devices writable */ | |
2602 | } else { | |
2603 | mddev->ro = 2; | |
2604 | err = do_md_run(mddev); | |
2605 | } | |
2606 | break; | |
2607 | case clean: | |
2608 | if (mddev->pers) { | |
2609 | restart_array(mddev); | |
2610 | spin_lock_irq(&mddev->write_lock); | |
2611 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2612 | if (mddev->in_sync == 0) { |
2613 | mddev->in_sync = 1; | |
2614 | if (mddev->persistent) | |
2615 | set_bit(MD_CHANGE_CLEAN, | |
2616 | &mddev->flags); | |
2617 | } | |
2618 | err = 0; | |
2619 | } else | |
2620 | err = -EBUSY; | |
9e653b63 N |
2621 | spin_unlock_irq(&mddev->write_lock); |
2622 | } else { | |
2623 | mddev->ro = 0; | |
2624 | mddev->recovery_cp = MaxSector; | |
2625 | err = do_md_run(mddev); | |
2626 | } | |
2627 | break; | |
2628 | case active: | |
2629 | if (mddev->pers) { | |
2630 | restart_array(mddev); | |
e691063a N |
2631 | if (mddev->external) |
2632 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2633 | wake_up(&mddev->sb_wait); |
2634 | err = 0; | |
2635 | } else { | |
2636 | mddev->ro = 0; | |
2637 | err = do_md_run(mddev); | |
2638 | } | |
2639 | break; | |
2640 | case write_pending: | |
2641 | case active_idle: | |
2642 | /* these cannot be set */ | |
2643 | break; | |
2644 | } | |
2645 | if (err) | |
2646 | return err; | |
2647 | else | |
2648 | return len; | |
2649 | } | |
80ca3a44 N |
2650 | static struct md_sysfs_entry md_array_state = |
2651 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2652 | |
6d7ff738 N |
2653 | static ssize_t |
2654 | null_show(mddev_t *mddev, char *page) | |
2655 | { | |
2656 | return -EINVAL; | |
2657 | } | |
2658 | ||
2659 | static ssize_t | |
2660 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2661 | { | |
2662 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2663 | /* The new device is added to the array. | |
2664 | * If the array has a persistent superblock, we read the | |
2665 | * superblock to initialise info and check validity. | |
2666 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2667 | * which mainly checks size. | |
2668 | */ | |
2669 | char *e; | |
2670 | int major = simple_strtoul(buf, &e, 10); | |
2671 | int minor; | |
2672 | dev_t dev; | |
2673 | mdk_rdev_t *rdev; | |
2674 | int err; | |
2675 | ||
2676 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2677 | return -EINVAL; | |
2678 | minor = simple_strtoul(e+1, &e, 10); | |
2679 | if (*e && *e != '\n') | |
2680 | return -EINVAL; | |
2681 | dev = MKDEV(major, minor); | |
2682 | if (major != MAJOR(dev) || | |
2683 | minor != MINOR(dev)) | |
2684 | return -EOVERFLOW; | |
2685 | ||
2686 | ||
2687 | if (mddev->persistent) { | |
2688 | rdev = md_import_device(dev, mddev->major_version, | |
2689 | mddev->minor_version); | |
2690 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2691 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2692 | mdk_rdev_t, same_set); | |
2693 | err = super_types[mddev->major_version] | |
2694 | .load_super(rdev, rdev0, mddev->minor_version); | |
2695 | if (err < 0) | |
2696 | goto out; | |
2697 | } | |
c5d79adb N |
2698 | } else if (mddev->external) |
2699 | rdev = md_import_device(dev, -2, -1); | |
2700 | else | |
6d7ff738 N |
2701 | rdev = md_import_device(dev, -1, -1); |
2702 | ||
2703 | if (IS_ERR(rdev)) | |
2704 | return PTR_ERR(rdev); | |
2705 | err = bind_rdev_to_array(rdev, mddev); | |
2706 | out: | |
2707 | if (err) | |
2708 | export_rdev(rdev); | |
2709 | return err ? err : len; | |
2710 | } | |
2711 | ||
2712 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2713 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2714 | |
9b1d1dac PC |
2715 | static ssize_t |
2716 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2717 | { | |
2718 | char *end; | |
2719 | unsigned long chunk, end_chunk; | |
2720 | ||
2721 | if (!mddev->bitmap) | |
2722 | goto out; | |
2723 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2724 | while (*buf) { | |
2725 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2726 | if (buf == end) break; | |
2727 | if (*end == '-') { /* range */ | |
2728 | buf = end + 1; | |
2729 | end_chunk = simple_strtoul(buf, &end, 0); | |
2730 | if (buf == end) break; | |
2731 | } | |
2732 | if (*end && !isspace(*end)) break; | |
2733 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2734 | buf = end; | |
2735 | while (isspace(*buf)) buf++; | |
2736 | } | |
2737 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2738 | out: | |
2739 | return len; | |
2740 | } | |
2741 | ||
2742 | static struct md_sysfs_entry md_bitmap = | |
2743 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2744 | ||
a35b0d69 N |
2745 | static ssize_t |
2746 | size_show(mddev_t *mddev, char *page) | |
2747 | { | |
2748 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2749 | } | |
2750 | ||
2751 | static int update_size(mddev_t *mddev, unsigned long size); | |
2752 | ||
2753 | static ssize_t | |
2754 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2755 | { | |
2756 | /* If array is inactive, we can reduce the component size, but | |
2757 | * not increase it (except from 0). | |
2758 | * If array is active, we can try an on-line resize | |
2759 | */ | |
2760 | char *e; | |
2761 | int err = 0; | |
2762 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2763 | if (!*buf || *buf == '\n' || | |
2764 | (*e && *e != '\n')) | |
2765 | return -EINVAL; | |
2766 | ||
2767 | if (mddev->pers) { | |
2768 | err = update_size(mddev, size); | |
850b2b42 | 2769 | md_update_sb(mddev, 1); |
a35b0d69 N |
2770 | } else { |
2771 | if (mddev->size == 0 || | |
2772 | mddev->size > size) | |
2773 | mddev->size = size; | |
2774 | else | |
2775 | err = -ENOSPC; | |
2776 | } | |
2777 | return err ? err : len; | |
2778 | } | |
2779 | ||
2780 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 2781 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 2782 | |
8bb93aac N |
2783 | |
2784 | /* Metdata version. | |
e691063a N |
2785 | * This is one of |
2786 | * 'none' for arrays with no metadata (good luck...) | |
2787 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
2788 | * or N.M for internally known formats |
2789 | */ | |
2790 | static ssize_t | |
2791 | metadata_show(mddev_t *mddev, char *page) | |
2792 | { | |
2793 | if (mddev->persistent) | |
2794 | return sprintf(page, "%d.%d\n", | |
2795 | mddev->major_version, mddev->minor_version); | |
e691063a N |
2796 | else if (mddev->external) |
2797 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
2798 | else |
2799 | return sprintf(page, "none\n"); | |
2800 | } | |
2801 | ||
2802 | static ssize_t | |
2803 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2804 | { | |
2805 | int major, minor; | |
2806 | char *e; | |
2807 | if (!list_empty(&mddev->disks)) | |
2808 | return -EBUSY; | |
2809 | ||
2810 | if (cmd_match(buf, "none")) { | |
2811 | mddev->persistent = 0; | |
e691063a N |
2812 | mddev->external = 0; |
2813 | mddev->major_version = 0; | |
2814 | mddev->minor_version = 90; | |
2815 | return len; | |
2816 | } | |
2817 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 2818 | size_t namelen = len-9; |
e691063a N |
2819 | if (namelen >= sizeof(mddev->metadata_type)) |
2820 | namelen = sizeof(mddev->metadata_type)-1; | |
2821 | strncpy(mddev->metadata_type, buf+9, namelen); | |
2822 | mddev->metadata_type[namelen] = 0; | |
2823 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
2824 | mddev->metadata_type[--namelen] = 0; | |
2825 | mddev->persistent = 0; | |
2826 | mddev->external = 1; | |
8bb93aac N |
2827 | mddev->major_version = 0; |
2828 | mddev->minor_version = 90; | |
2829 | return len; | |
2830 | } | |
2831 | major = simple_strtoul(buf, &e, 10); | |
2832 | if (e==buf || *e != '.') | |
2833 | return -EINVAL; | |
2834 | buf = e+1; | |
2835 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 2836 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 2837 | return -EINVAL; |
50511da3 | 2838 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
2839 | return -ENOENT; |
2840 | mddev->major_version = major; | |
2841 | mddev->minor_version = minor; | |
2842 | mddev->persistent = 1; | |
e691063a | 2843 | mddev->external = 0; |
8bb93aac N |
2844 | return len; |
2845 | } | |
2846 | ||
2847 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 2848 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 2849 | |
24dd469d | 2850 | static ssize_t |
7eec314d | 2851 | action_show(mddev_t *mddev, char *page) |
24dd469d | 2852 | { |
7eec314d | 2853 | char *type = "idle"; |
31399d9e | 2854 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 2855 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
2856 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
2857 | type = "reshape"; | |
2858 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2859 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2860 | type = "resync"; | |
2861 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2862 | type = "check"; | |
2863 | else | |
2864 | type = "repair"; | |
2865 | } else | |
2866 | type = "recover"; | |
2867 | } | |
2868 | return sprintf(page, "%s\n", type); | |
2869 | } | |
2870 | ||
2871 | static ssize_t | |
7eec314d | 2872 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 2873 | { |
7eec314d N |
2874 | if (!mddev->pers || !mddev->pers->sync_request) |
2875 | return -EINVAL; | |
2876 | ||
bce74dac | 2877 | if (cmd_match(page, "idle")) { |
7eec314d N |
2878 | if (mddev->sync_thread) { |
2879 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2880 | md_unregister_thread(mddev->sync_thread); | |
2881 | mddev->sync_thread = NULL; | |
2882 | mddev->recovery = 0; | |
2883 | } | |
03c902e1 N |
2884 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2885 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 2886 | return -EBUSY; |
03c902e1 | 2887 | else if (cmd_match(page, "resync") || cmd_match(page, "recover")) |
7eec314d | 2888 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
16484bf5 N |
2889 | else if (cmd_match(page, "reshape")) { |
2890 | int err; | |
2891 | if (mddev->pers->start_reshape == NULL) | |
2892 | return -EINVAL; | |
2893 | err = mddev->pers->start_reshape(mddev); | |
2894 | if (err) | |
2895 | return err; | |
2896 | } else { | |
bce74dac | 2897 | if (cmd_match(page, "check")) |
7eec314d | 2898 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 2899 | else if (!cmd_match(page, "repair")) |
7eec314d N |
2900 | return -EINVAL; |
2901 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
2902 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 2903 | } |
03c902e1 | 2904 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d N |
2905 | md_wakeup_thread(mddev->thread); |
2906 | return len; | |
2907 | } | |
2908 | ||
9d88883e | 2909 | static ssize_t |
96de1e66 | 2910 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
2911 | { |
2912 | return sprintf(page, "%llu\n", | |
2913 | (unsigned long long) mddev->resync_mismatches); | |
2914 | } | |
2915 | ||
80ca3a44 N |
2916 | static struct md_sysfs_entry md_scan_mode = |
2917 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 2918 | |
96de1e66 | 2919 | |
80ca3a44 | 2920 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 2921 | |
88202a0c N |
2922 | static ssize_t |
2923 | sync_min_show(mddev_t *mddev, char *page) | |
2924 | { | |
2925 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
2926 | mddev->sync_speed_min ? "local": "system"); | |
2927 | } | |
2928 | ||
2929 | static ssize_t | |
2930 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
2931 | { | |
2932 | int min; | |
2933 | char *e; | |
2934 | if (strncmp(buf, "system", 6)==0) { | |
2935 | mddev->sync_speed_min = 0; | |
2936 | return len; | |
2937 | } | |
2938 | min = simple_strtoul(buf, &e, 10); | |
2939 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
2940 | return -EINVAL; | |
2941 | mddev->sync_speed_min = min; | |
2942 | return len; | |
2943 | } | |
2944 | ||
2945 | static struct md_sysfs_entry md_sync_min = | |
2946 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
2947 | ||
2948 | static ssize_t | |
2949 | sync_max_show(mddev_t *mddev, char *page) | |
2950 | { | |
2951 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
2952 | mddev->sync_speed_max ? "local": "system"); | |
2953 | } | |
2954 | ||
2955 | static ssize_t | |
2956 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
2957 | { | |
2958 | int max; | |
2959 | char *e; | |
2960 | if (strncmp(buf, "system", 6)==0) { | |
2961 | mddev->sync_speed_max = 0; | |
2962 | return len; | |
2963 | } | |
2964 | max = simple_strtoul(buf, &e, 10); | |
2965 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
2966 | return -EINVAL; | |
2967 | mddev->sync_speed_max = max; | |
2968 | return len; | |
2969 | } | |
2970 | ||
2971 | static struct md_sysfs_entry md_sync_max = | |
2972 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
2973 | ||
d7f3d291 IP |
2974 | static ssize_t |
2975 | degraded_show(mddev_t *mddev, char *page) | |
2976 | { | |
2977 | return sprintf(page, "%d\n", mddev->degraded); | |
2978 | } | |
2979 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c N |
2980 | |
2981 | static ssize_t | |
2982 | sync_speed_show(mddev_t *mddev, char *page) | |
2983 | { | |
2984 | unsigned long resync, dt, db; | |
ff4e8d9a | 2985 | resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)); |
88202a0c N |
2986 | dt = ((jiffies - mddev->resync_mark) / HZ); |
2987 | if (!dt) dt++; | |
2988 | db = resync - (mddev->resync_mark_cnt); | |
2989 | return sprintf(page, "%ld\n", db/dt/2); /* K/sec */ | |
2990 | } | |
2991 | ||
80ca3a44 | 2992 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
2993 | |
2994 | static ssize_t | |
2995 | sync_completed_show(mddev_t *mddev, char *page) | |
2996 | { | |
2997 | unsigned long max_blocks, resync; | |
2998 | ||
2999 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3000 | max_blocks = mddev->resync_max_sectors; | |
3001 | else | |
3002 | max_blocks = mddev->size << 1; | |
3003 | ||
3004 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
3005 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
3006 | } | |
3007 | ||
80ca3a44 | 3008 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3009 | |
c6207277 N |
3010 | static ssize_t |
3011 | max_sync_show(mddev_t *mddev, char *page) | |
3012 | { | |
3013 | if (mddev->resync_max == MaxSector) | |
3014 | return sprintf(page, "max\n"); | |
3015 | else | |
3016 | return sprintf(page, "%llu\n", | |
3017 | (unsigned long long)mddev->resync_max); | |
3018 | } | |
3019 | static ssize_t | |
3020 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3021 | { | |
3022 | if (strncmp(buf, "max", 3) == 0) | |
3023 | mddev->resync_max = MaxSector; | |
3024 | else { | |
3025 | char *ep; | |
3026 | unsigned long long max = simple_strtoull(buf, &ep, 10); | |
3027 | if (ep == buf || (*ep != 0 && *ep != '\n')) | |
3028 | return -EINVAL; | |
3029 | if (max < mddev->resync_max && | |
3030 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3031 | return -EBUSY; | |
3032 | ||
3033 | /* Must be a multiple of chunk_size */ | |
3034 | if (mddev->chunk_size) { | |
3035 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3036 | return -EINVAL; | |
3037 | } | |
3038 | mddev->resync_max = max; | |
3039 | } | |
3040 | wake_up(&mddev->recovery_wait); | |
3041 | return len; | |
3042 | } | |
3043 | ||
3044 | static struct md_sysfs_entry md_max_sync = | |
3045 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3046 | ||
e464eafd N |
3047 | static ssize_t |
3048 | suspend_lo_show(mddev_t *mddev, char *page) | |
3049 | { | |
3050 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3051 | } | |
3052 | ||
3053 | static ssize_t | |
3054 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3055 | { | |
3056 | char *e; | |
3057 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3058 | ||
3059 | if (mddev->pers->quiesce == NULL) | |
3060 | return -EINVAL; | |
3061 | if (buf == e || (*e && *e != '\n')) | |
3062 | return -EINVAL; | |
3063 | if (new >= mddev->suspend_hi || | |
3064 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3065 | mddev->suspend_lo = new; | |
3066 | mddev->pers->quiesce(mddev, 2); | |
3067 | return len; | |
3068 | } else | |
3069 | return -EINVAL; | |
3070 | } | |
3071 | static struct md_sysfs_entry md_suspend_lo = | |
3072 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3073 | ||
3074 | ||
3075 | static ssize_t | |
3076 | suspend_hi_show(mddev_t *mddev, char *page) | |
3077 | { | |
3078 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3079 | } | |
3080 | ||
3081 | static ssize_t | |
3082 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3083 | { | |
3084 | char *e; | |
3085 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3086 | ||
3087 | if (mddev->pers->quiesce == NULL) | |
3088 | return -EINVAL; | |
3089 | if (buf == e || (*e && *e != '\n')) | |
3090 | return -EINVAL; | |
3091 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3092 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3093 | mddev->suspend_hi = new; | |
3094 | mddev->pers->quiesce(mddev, 1); | |
3095 | mddev->pers->quiesce(mddev, 0); | |
3096 | return len; | |
3097 | } else | |
3098 | return -EINVAL; | |
3099 | } | |
3100 | static struct md_sysfs_entry md_suspend_hi = | |
3101 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3102 | ||
08a02ecd N |
3103 | static ssize_t |
3104 | reshape_position_show(mddev_t *mddev, char *page) | |
3105 | { | |
3106 | if (mddev->reshape_position != MaxSector) | |
3107 | return sprintf(page, "%llu\n", | |
3108 | (unsigned long long)mddev->reshape_position); | |
3109 | strcpy(page, "none\n"); | |
3110 | return 5; | |
3111 | } | |
3112 | ||
3113 | static ssize_t | |
3114 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3115 | { | |
3116 | char *e; | |
3117 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3118 | if (mddev->pers) | |
3119 | return -EBUSY; | |
3120 | if (buf == e || (*e && *e != '\n')) | |
3121 | return -EINVAL; | |
3122 | mddev->reshape_position = new; | |
3123 | mddev->delta_disks = 0; | |
3124 | mddev->new_level = mddev->level; | |
3125 | mddev->new_layout = mddev->layout; | |
3126 | mddev->new_chunk = mddev->chunk_size; | |
3127 | return len; | |
3128 | } | |
3129 | ||
3130 | static struct md_sysfs_entry md_reshape_position = | |
3131 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3132 | reshape_position_store); | |
3133 | ||
e464eafd | 3134 | |
eae1701f N |
3135 | static struct attribute *md_default_attrs[] = { |
3136 | &md_level.attr, | |
d4dbd025 | 3137 | &md_layout.attr, |
eae1701f | 3138 | &md_raid_disks.attr, |
3b34380a | 3139 | &md_chunk_size.attr, |
a35b0d69 | 3140 | &md_size.attr, |
a94213b1 | 3141 | &md_resync_start.attr, |
8bb93aac | 3142 | &md_metadata.attr, |
6d7ff738 | 3143 | &md_new_device.attr, |
16f17b39 | 3144 | &md_safe_delay.attr, |
9e653b63 | 3145 | &md_array_state.attr, |
08a02ecd | 3146 | &md_reshape_position.attr, |
411036fa N |
3147 | NULL, |
3148 | }; | |
3149 | ||
3150 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3151 | &md_scan_mode.attr, |
9d88883e | 3152 | &md_mismatches.attr, |
88202a0c N |
3153 | &md_sync_min.attr, |
3154 | &md_sync_max.attr, | |
3155 | &md_sync_speed.attr, | |
3156 | &md_sync_completed.attr, | |
c6207277 | 3157 | &md_max_sync.attr, |
e464eafd N |
3158 | &md_suspend_lo.attr, |
3159 | &md_suspend_hi.attr, | |
9b1d1dac | 3160 | &md_bitmap.attr, |
d7f3d291 | 3161 | &md_degraded.attr, |
eae1701f N |
3162 | NULL, |
3163 | }; | |
411036fa N |
3164 | static struct attribute_group md_redundancy_group = { |
3165 | .name = NULL, | |
3166 | .attrs = md_redundancy_attrs, | |
3167 | }; | |
3168 | ||
eae1701f N |
3169 | |
3170 | static ssize_t | |
3171 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3172 | { | |
3173 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3174 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3175 | ssize_t rv; |
eae1701f N |
3176 | |
3177 | if (!entry->show) | |
3178 | return -EIO; | |
5dc5cf7d IM |
3179 | rv = mddev_lock(mddev); |
3180 | if (!rv) { | |
3181 | rv = entry->show(mddev, page); | |
3182 | mddev_unlock(mddev); | |
3183 | } | |
96de1e66 | 3184 | return rv; |
eae1701f N |
3185 | } |
3186 | ||
3187 | static ssize_t | |
3188 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3189 | const char *page, size_t length) | |
3190 | { | |
3191 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3192 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3193 | ssize_t rv; |
eae1701f N |
3194 | |
3195 | if (!entry->store) | |
3196 | return -EIO; | |
67463acb N |
3197 | if (!capable(CAP_SYS_ADMIN)) |
3198 | return -EACCES; | |
5dc5cf7d IM |
3199 | rv = mddev_lock(mddev); |
3200 | if (!rv) { | |
3201 | rv = entry->store(mddev, page, length); | |
3202 | mddev_unlock(mddev); | |
3203 | } | |
96de1e66 | 3204 | return rv; |
eae1701f N |
3205 | } |
3206 | ||
3207 | static void md_free(struct kobject *ko) | |
3208 | { | |
3209 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
3210 | kfree(mddev); | |
3211 | } | |
3212 | ||
3213 | static struct sysfs_ops md_sysfs_ops = { | |
3214 | .show = md_attr_show, | |
3215 | .store = md_attr_store, | |
3216 | }; | |
3217 | static struct kobj_type md_ktype = { | |
3218 | .release = md_free, | |
3219 | .sysfs_ops = &md_sysfs_ops, | |
3220 | .default_attrs = md_default_attrs, | |
3221 | }; | |
3222 | ||
1da177e4 LT |
3223 | int mdp_major = 0; |
3224 | ||
3225 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3226 | { | |
48c9c27b | 3227 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3228 | mddev_t *mddev = mddev_find(dev); |
3229 | struct gendisk *disk; | |
3230 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
3231 | int shift = partitioned ? MdpMinorShift : 0; | |
3232 | int unit = MINOR(dev) >> shift; | |
3830c62f | 3233 | int error; |
1da177e4 LT |
3234 | |
3235 | if (!mddev) | |
3236 | return NULL; | |
3237 | ||
48c9c27b | 3238 | mutex_lock(&disks_mutex); |
1da177e4 | 3239 | if (mddev->gendisk) { |
48c9c27b | 3240 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3241 | mddev_put(mddev); |
3242 | return NULL; | |
3243 | } | |
3244 | disk = alloc_disk(1 << shift); | |
3245 | if (!disk) { | |
48c9c27b | 3246 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3247 | mddev_put(mddev); |
3248 | return NULL; | |
3249 | } | |
3250 | disk->major = MAJOR(dev); | |
3251 | disk->first_minor = unit << shift; | |
ce7b0f46 | 3252 | if (partitioned) |
1da177e4 | 3253 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3254 | else |
1da177e4 | 3255 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3256 | disk->fops = &md_fops; |
3257 | disk->private_data = mddev; | |
3258 | disk->queue = mddev->queue; | |
3259 | add_disk(disk); | |
3260 | mddev->gendisk = disk; | |
48c9c27b | 3261 | mutex_unlock(&disks_mutex); |
edfaa7c3 | 3262 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj, |
3830c62f GKH |
3263 | "%s", "md"); |
3264 | if (error) | |
5e55e2f5 N |
3265 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3266 | disk->disk_name); | |
3830c62f GKH |
3267 | else |
3268 | kobject_uevent(&mddev->kobj, KOBJ_ADD); | |
1da177e4 LT |
3269 | return NULL; |
3270 | } | |
3271 | ||
1da177e4 LT |
3272 | static void md_safemode_timeout(unsigned long data) |
3273 | { | |
3274 | mddev_t *mddev = (mddev_t *) data; | |
3275 | ||
3276 | mddev->safemode = 1; | |
3277 | md_wakeup_thread(mddev->thread); | |
3278 | } | |
3279 | ||
6ff8d8ec | 3280 | static int start_dirty_degraded; |
1da177e4 LT |
3281 | |
3282 | static int do_md_run(mddev_t * mddev) | |
3283 | { | |
2604b703 | 3284 | int err; |
1da177e4 LT |
3285 | int chunk_size; |
3286 | struct list_head *tmp; | |
3287 | mdk_rdev_t *rdev; | |
3288 | struct gendisk *disk; | |
2604b703 | 3289 | struct mdk_personality *pers; |
1da177e4 LT |
3290 | char b[BDEVNAME_SIZE]; |
3291 | ||
a757e64c N |
3292 | if (list_empty(&mddev->disks)) |
3293 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3294 | return -EINVAL; |
1da177e4 LT |
3295 | |
3296 | if (mddev->pers) | |
3297 | return -EBUSY; | |
3298 | ||
3299 | /* | |
3300 | * Analyze all RAID superblock(s) | |
3301 | */ | |
1ec4a939 N |
3302 | if (!mddev->raid_disks) { |
3303 | if (!mddev->persistent) | |
3304 | return -EINVAL; | |
a757e64c | 3305 | analyze_sbs(mddev); |
1ec4a939 | 3306 | } |
1da177e4 LT |
3307 | |
3308 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3309 | |
3310 | if (chunk_size) { | |
1da177e4 LT |
3311 | if (chunk_size > MAX_CHUNK_SIZE) { |
3312 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3313 | chunk_size, MAX_CHUNK_SIZE); | |
3314 | return -EINVAL; | |
3315 | } | |
3316 | /* | |
3317 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
3318 | */ | |
3319 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3320 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3321 | return -EINVAL; |
3322 | } | |
3323 | if (chunk_size < PAGE_SIZE) { | |
3324 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
3325 | chunk_size, PAGE_SIZE); | |
3326 | return -EINVAL; | |
3327 | } | |
3328 | ||
3329 | /* devices must have minimum size of one chunk */ | |
d089c6af | 3330 | rdev_for_each(rdev, tmp, mddev) { |
b2d444d7 | 3331 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3332 | continue; |
3333 | if (rdev->size < chunk_size / 1024) { | |
3334 | printk(KERN_WARNING | |
3335 | "md: Dev %s smaller than chunk_size:" | |
3336 | " %lluk < %dk\n", | |
3337 | bdevname(rdev->bdev,b), | |
3338 | (unsigned long long)rdev->size, | |
3339 | chunk_size / 1024); | |
3340 | return -EINVAL; | |
3341 | } | |
3342 | } | |
3343 | } | |
3344 | ||
1da177e4 | 3345 | #ifdef CONFIG_KMOD |
d9d166c2 N |
3346 | if (mddev->level != LEVEL_NONE) |
3347 | request_module("md-level-%d", mddev->level); | |
3348 | else if (mddev->clevel[0]) | |
3349 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3350 | #endif |
3351 | ||
3352 | /* | |
3353 | * Drop all container device buffers, from now on | |
3354 | * the only valid external interface is through the md | |
3355 | * device. | |
1da177e4 | 3356 | */ |
d089c6af | 3357 | rdev_for_each(rdev, tmp, mddev) { |
b2d444d7 | 3358 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3359 | continue; |
3360 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3361 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3362 | |
3363 | /* perform some consistency tests on the device. | |
3364 | * We don't want the data to overlap the metadata, | |
3365 | * Internal Bitmap issues has handled elsewhere. | |
3366 | */ | |
3367 | if (rdev->data_offset < rdev->sb_offset) { | |
3368 | if (mddev->size && | |
3369 | rdev->data_offset + mddev->size*2 | |
3370 | > rdev->sb_offset*2) { | |
3371 | printk("md: %s: data overlaps metadata\n", | |
3372 | mdname(mddev)); | |
3373 | return -EINVAL; | |
3374 | } | |
3375 | } else { | |
3376 | if (rdev->sb_offset*2 + rdev->sb_size/512 | |
3377 | > rdev->data_offset) { | |
3378 | printk("md: %s: metadata overlaps data\n", | |
3379 | mdname(mddev)); | |
3380 | return -EINVAL; | |
3381 | } | |
3382 | } | |
1da177e4 LT |
3383 | } |
3384 | ||
3385 | md_probe(mddev->unit, NULL, NULL); | |
3386 | disk = mddev->gendisk; | |
3387 | if (!disk) | |
3388 | return -ENOMEM; | |
3389 | ||
3390 | spin_lock(&pers_lock); | |
d9d166c2 | 3391 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3392 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3393 | spin_unlock(&pers_lock); |
d9d166c2 N |
3394 | if (mddev->level != LEVEL_NONE) |
3395 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3396 | mddev->level); | |
3397 | else | |
3398 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3399 | mddev->clevel); | |
1da177e4 LT |
3400 | return -EINVAL; |
3401 | } | |
2604b703 | 3402 | mddev->pers = pers; |
1da177e4 | 3403 | spin_unlock(&pers_lock); |
d9d166c2 N |
3404 | mddev->level = pers->level; |
3405 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3406 | |
f6705578 | 3407 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3408 | pers->start_reshape == NULL) { |
f6705578 N |
3409 | /* This personality cannot handle reshaping... */ |
3410 | mddev->pers = NULL; | |
3411 | module_put(pers->owner); | |
3412 | return -EINVAL; | |
3413 | } | |
3414 | ||
7dd5e7c3 N |
3415 | if (pers->sync_request) { |
3416 | /* Warn if this is a potentially silly | |
3417 | * configuration. | |
3418 | */ | |
3419 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3420 | mdk_rdev_t *rdev2; | |
3421 | struct list_head *tmp2; | |
3422 | int warned = 0; | |
d089c6af N |
3423 | rdev_for_each(rdev, tmp, mddev) { |
3424 | rdev_for_each(rdev2, tmp2, mddev) { | |
7dd5e7c3 N |
3425 | if (rdev < rdev2 && |
3426 | rdev->bdev->bd_contains == | |
3427 | rdev2->bdev->bd_contains) { | |
3428 | printk(KERN_WARNING | |
3429 | "%s: WARNING: %s appears to be" | |
3430 | " on the same physical disk as" | |
3431 | " %s.\n", | |
3432 | mdname(mddev), | |
3433 | bdevname(rdev->bdev,b), | |
3434 | bdevname(rdev2->bdev,b2)); | |
3435 | warned = 1; | |
3436 | } | |
3437 | } | |
3438 | } | |
3439 | if (warned) | |
3440 | printk(KERN_WARNING | |
3441 | "True protection against single-disk" | |
3442 | " failure might be compromised.\n"); | |
3443 | } | |
3444 | ||
657390d2 | 3445 | mddev->recovery = 0; |
1da177e4 | 3446 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3447 | mddev->barriers_work = 1; |
6ff8d8ec | 3448 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3449 | |
f91de92e N |
3450 | if (start_readonly) |
3451 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3452 | ||
b15c2e57 N |
3453 | err = mddev->pers->run(mddev); |
3454 | if (!err && mddev->pers->sync_request) { | |
3455 | err = bitmap_create(mddev); | |
3456 | if (err) { | |
3457 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3458 | mdname(mddev), err); | |
3459 | mddev->pers->stop(mddev); | |
3460 | } | |
3461 | } | |
1da177e4 LT |
3462 | if (err) { |
3463 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3464 | module_put(mddev->pers->owner); | |
3465 | mddev->pers = NULL; | |
32a7627c N |
3466 | bitmap_destroy(mddev); |
3467 | return err; | |
1da177e4 | 3468 | } |
5e55e2f5 N |
3469 | if (mddev->pers->sync_request) { |
3470 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3471 | printk(KERN_WARNING | |
3472 | "md: cannot register extra attributes for %s\n", | |
3473 | mdname(mddev)); | |
3474 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ | |
fd9d49ca N |
3475 | mddev->ro = 0; |
3476 | ||
1da177e4 LT |
3477 | atomic_set(&mddev->writes_pending,0); |
3478 | mddev->safemode = 0; | |
3479 | mddev->safemode_timer.function = md_safemode_timeout; | |
3480 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3481 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3482 | mddev->in_sync = 1; |
86e6ffdd | 3483 | |
d089c6af | 3484 | rdev_for_each(rdev, tmp, mddev) |
86e6ffdd N |
3485 | if (rdev->raid_disk >= 0) { |
3486 | char nm[20]; | |
3487 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3488 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3489 | printk("md: cannot register %s for %s\n", | |
3490 | nm, mdname(mddev)); | |
86e6ffdd | 3491 | } |
1da177e4 LT |
3492 | |
3493 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3494 | ||
850b2b42 N |
3495 | if (mddev->flags) |
3496 | md_update_sb(mddev, 0); | |
1da177e4 LT |
3497 | |
3498 | set_capacity(disk, mddev->array_size<<1); | |
3499 | ||
3500 | /* If we call blk_queue_make_request here, it will | |
3501 | * re-initialise max_sectors etc which may have been | |
3502 | * refined inside -> run. So just set the bits we need to set. | |
3503 | * Most initialisation happended when we called | |
3504 | * blk_queue_make_request(..., md_fail_request) | |
3505 | * earlier. | |
3506 | */ | |
3507 | mddev->queue->queuedata = mddev; | |
3508 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3509 | ||
5fd6c1dc N |
3510 | /* If there is a partially-recovered drive we need to |
3511 | * start recovery here. If we leave it to md_check_recovery, | |
3512 | * it will remove the drives and not do the right thing | |
3513 | */ | |
0b8c9de0 | 3514 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc N |
3515 | struct list_head *rtmp; |
3516 | int spares = 0; | |
d089c6af | 3517 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
3518 | if (rdev->raid_disk >= 0 && |
3519 | !test_bit(In_sync, &rdev->flags) && | |
3520 | !test_bit(Faulty, &rdev->flags)) | |
3521 | /* complete an interrupted recovery */ | |
3522 | spares++; | |
3523 | if (spares && mddev->pers->sync_request) { | |
3524 | mddev->recovery = 0; | |
3525 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3526 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3527 | mddev, | |
3528 | "%s_resync"); | |
3529 | if (!mddev->sync_thread) { | |
3530 | printk(KERN_ERR "%s: could not start resync" | |
3531 | " thread...\n", | |
3532 | mdname(mddev)); | |
3533 | /* leave the spares where they are, it shouldn't hurt */ | |
3534 | mddev->recovery = 0; | |
0b8c9de0 | 3535 | } |
5fd6c1dc N |
3536 | } |
3537 | } | |
0b8c9de0 N |
3538 | md_wakeup_thread(mddev->thread); |
3539 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3540 | |
44ce6294 | 3541 | mddev->changed = 1; |
d7603b7e | 3542 | md_new_event(mddev); |
edfaa7c3 | 3543 | kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE); |
1da177e4 LT |
3544 | return 0; |
3545 | } | |
3546 | ||
3547 | static int restart_array(mddev_t *mddev) | |
3548 | { | |
3549 | struct gendisk *disk = mddev->gendisk; | |
3550 | int err; | |
3551 | ||
3552 | /* | |
3553 | * Complain if it has no devices | |
3554 | */ | |
3555 | err = -ENXIO; | |
3556 | if (list_empty(&mddev->disks)) | |
3557 | goto out; | |
3558 | ||
3559 | if (mddev->pers) { | |
3560 | err = -EBUSY; | |
3561 | if (!mddev->ro) | |
3562 | goto out; | |
3563 | ||
3564 | mddev->safemode = 0; | |
3565 | mddev->ro = 0; | |
3566 | set_disk_ro(disk, 0); | |
3567 | ||
3568 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3569 | mdname(mddev)); | |
3570 | /* | |
3571 | * Kick recovery or resync if necessary | |
3572 | */ | |
3573 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3574 | md_wakeup_thread(mddev->thread); | |
5fd6c1dc | 3575 | md_wakeup_thread(mddev->sync_thread); |
1da177e4 | 3576 | err = 0; |
9e653b63 | 3577 | } else |
1da177e4 | 3578 | err = -EINVAL; |
1da177e4 LT |
3579 | |
3580 | out: | |
3581 | return err; | |
3582 | } | |
3583 | ||
acc55e22 N |
3584 | /* similar to deny_write_access, but accounts for our holding a reference |
3585 | * to the file ourselves */ | |
3586 | static int deny_bitmap_write_access(struct file * file) | |
3587 | { | |
3588 | struct inode *inode = file->f_mapping->host; | |
3589 | ||
3590 | spin_lock(&inode->i_lock); | |
3591 | if (atomic_read(&inode->i_writecount) > 1) { | |
3592 | spin_unlock(&inode->i_lock); | |
3593 | return -ETXTBSY; | |
3594 | } | |
3595 | atomic_set(&inode->i_writecount, -1); | |
3596 | spin_unlock(&inode->i_lock); | |
3597 | ||
3598 | return 0; | |
3599 | } | |
3600 | ||
3601 | static void restore_bitmap_write_access(struct file *file) | |
3602 | { | |
3603 | struct inode *inode = file->f_mapping->host; | |
3604 | ||
3605 | spin_lock(&inode->i_lock); | |
3606 | atomic_set(&inode->i_writecount, 1); | |
3607 | spin_unlock(&inode->i_lock); | |
3608 | } | |
3609 | ||
9e653b63 N |
3610 | /* mode: |
3611 | * 0 - completely stop and dis-assemble array | |
3612 | * 1 - switch to readonly | |
3613 | * 2 - stop but do not disassemble array | |
3614 | */ | |
3615 | static int do_md_stop(mddev_t * mddev, int mode) | |
1da177e4 LT |
3616 | { |
3617 | int err = 0; | |
3618 | struct gendisk *disk = mddev->gendisk; | |
3619 | ||
3620 | if (mddev->pers) { | |
3621 | if (atomic_read(&mddev->active)>2) { | |
3622 | printk("md: %s still in use.\n",mdname(mddev)); | |
3623 | return -EBUSY; | |
3624 | } | |
3625 | ||
3626 | if (mddev->sync_thread) { | |
5fd6c1dc | 3627 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3628 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3629 | md_unregister_thread(mddev->sync_thread); | |
3630 | mddev->sync_thread = NULL; | |
3631 | } | |
3632 | ||
3633 | del_timer_sync(&mddev->safemode_timer); | |
3634 | ||
3635 | invalidate_partition(disk, 0); | |
3636 | ||
9e653b63 N |
3637 | switch(mode) { |
3638 | case 1: /* readonly */ | |
1da177e4 | 3639 | err = -ENXIO; |
f91de92e | 3640 | if (mddev->ro==1) |
1da177e4 LT |
3641 | goto out; |
3642 | mddev->ro = 1; | |
9e653b63 N |
3643 | break; |
3644 | case 0: /* disassemble */ | |
3645 | case 2: /* stop */ | |
6b8b3e8a | 3646 | bitmap_flush(mddev); |
a9701a30 | 3647 | md_super_wait(mddev); |
1da177e4 LT |
3648 | if (mddev->ro) |
3649 | set_disk_ro(disk, 0); | |
3650 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3651 | mddev->pers->stop(mddev); | |
d1b5380c N |
3652 | mddev->queue->merge_bvec_fn = NULL; |
3653 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 3654 | mddev->queue->backing_dev_info.congested_fn = NULL; |
411036fa N |
3655 | if (mddev->pers->sync_request) |
3656 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
3657 | ||
1da177e4 LT |
3658 | module_put(mddev->pers->owner); |
3659 | mddev->pers = NULL; | |
0d4ca600 N |
3660 | |
3661 | set_capacity(disk, 0); | |
44ce6294 | 3662 | mddev->changed = 1; |
0d4ca600 | 3663 | |
1da177e4 LT |
3664 | if (mddev->ro) |
3665 | mddev->ro = 0; | |
3666 | } | |
850b2b42 | 3667 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
3668 | /* mark array as shutdown cleanly */ |
3669 | mddev->in_sync = 1; | |
850b2b42 | 3670 | md_update_sb(mddev, 1); |
1da177e4 | 3671 | } |
9e653b63 | 3672 | if (mode == 1) |
1da177e4 | 3673 | set_disk_ro(disk, 1); |
5fd6c1dc | 3674 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3675 | } |
32a7627c | 3676 | |
1da177e4 LT |
3677 | /* |
3678 | * Free resources if final stop | |
3679 | */ | |
9e653b63 | 3680 | if (mode == 0) { |
86e6ffdd N |
3681 | mdk_rdev_t *rdev; |
3682 | struct list_head *tmp; | |
0d4ca600 | 3683 | |
1da177e4 LT |
3684 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
3685 | ||
978f946b N |
3686 | bitmap_destroy(mddev); |
3687 | if (mddev->bitmap_file) { | |
acc55e22 | 3688 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3689 | fput(mddev->bitmap_file); |
3690 | mddev->bitmap_file = NULL; | |
3691 | } | |
3692 | mddev->bitmap_offset = 0; | |
3693 | ||
d089c6af | 3694 | rdev_for_each(rdev, tmp, mddev) |
86e6ffdd N |
3695 | if (rdev->raid_disk >= 0) { |
3696 | char nm[20]; | |
3697 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3698 | sysfs_remove_link(&mddev->kobj, nm); | |
3699 | } | |
3700 | ||
177a99b2 | 3701 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
3702 | flush_scheduled_work(); |
3703 | ||
1da177e4 LT |
3704 | export_array(mddev); |
3705 | ||
3706 | mddev->array_size = 0; | |
9e653b63 N |
3707 | mddev->size = 0; |
3708 | mddev->raid_disks = 0; | |
a94213b1 | 3709 | mddev->recovery_cp = 0; |
c6207277 | 3710 | mddev->resync_max = MaxSector; |
08a02ecd | 3711 | mddev->reshape_position = MaxSector; |
e691063a | 3712 | mddev->external = 0; |
1ec4a939 | 3713 | mddev->persistent = 0; |
9e653b63 | 3714 | |
a8a55c38 | 3715 | } else if (mddev->pers) |
1da177e4 LT |
3716 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
3717 | mdname(mddev)); | |
3718 | err = 0; | |
d7603b7e | 3719 | md_new_event(mddev); |
1da177e4 LT |
3720 | out: |
3721 | return err; | |
3722 | } | |
3723 | ||
fdee8ae4 | 3724 | #ifndef MODULE |
1da177e4 LT |
3725 | static void autorun_array(mddev_t *mddev) |
3726 | { | |
3727 | mdk_rdev_t *rdev; | |
3728 | struct list_head *tmp; | |
3729 | int err; | |
3730 | ||
a757e64c | 3731 | if (list_empty(&mddev->disks)) |
1da177e4 | 3732 | return; |
1da177e4 LT |
3733 | |
3734 | printk(KERN_INFO "md: running: "); | |
3735 | ||
d089c6af | 3736 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
3737 | char b[BDEVNAME_SIZE]; |
3738 | printk("<%s>", bdevname(rdev->bdev,b)); | |
3739 | } | |
3740 | printk("\n"); | |
3741 | ||
3742 | err = do_md_run (mddev); | |
3743 | if (err) { | |
3744 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
3745 | do_md_stop (mddev, 0); | |
3746 | } | |
3747 | } | |
3748 | ||
3749 | /* | |
3750 | * lets try to run arrays based on all disks that have arrived | |
3751 | * until now. (those are in pending_raid_disks) | |
3752 | * | |
3753 | * the method: pick the first pending disk, collect all disks with | |
3754 | * the same UUID, remove all from the pending list and put them into | |
3755 | * the 'same_array' list. Then order this list based on superblock | |
3756 | * update time (freshest comes first), kick out 'old' disks and | |
3757 | * compare superblocks. If everything's fine then run it. | |
3758 | * | |
3759 | * If "unit" is allocated, then bump its reference count | |
3760 | */ | |
3761 | static void autorun_devices(int part) | |
3762 | { | |
1da177e4 LT |
3763 | struct list_head *tmp; |
3764 | mdk_rdev_t *rdev0, *rdev; | |
3765 | mddev_t *mddev; | |
3766 | char b[BDEVNAME_SIZE]; | |
3767 | ||
3768 | printk(KERN_INFO "md: autorun ...\n"); | |
3769 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 3770 | int unit; |
1da177e4 | 3771 | dev_t dev; |
ad01c9e3 | 3772 | LIST_HEAD(candidates); |
1da177e4 LT |
3773 | rdev0 = list_entry(pending_raid_disks.next, |
3774 | mdk_rdev_t, same_set); | |
3775 | ||
3776 | printk(KERN_INFO "md: considering %s ...\n", | |
3777 | bdevname(rdev0->bdev,b)); | |
3778 | INIT_LIST_HEAD(&candidates); | |
73c34431 | 3779 | rdev_for_each_list(rdev, tmp, pending_raid_disks) |
1da177e4 LT |
3780 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
3781 | printk(KERN_INFO "md: adding %s ...\n", | |
3782 | bdevname(rdev->bdev,b)); | |
3783 | list_move(&rdev->same_set, &candidates); | |
3784 | } | |
3785 | /* | |
3786 | * now we have a set of devices, with all of them having | |
3787 | * mostly sane superblocks. It's time to allocate the | |
3788 | * mddev. | |
3789 | */ | |
e8703fe1 N |
3790 | if (part) { |
3791 | dev = MKDEV(mdp_major, | |
3792 | rdev0->preferred_minor << MdpMinorShift); | |
3793 | unit = MINOR(dev) >> MdpMinorShift; | |
3794 | } else { | |
3795 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
3796 | unit = MINOR(dev); | |
3797 | } | |
3798 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
3799 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
3800 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
3801 | break; | |
3802 | } | |
1da177e4 LT |
3803 | |
3804 | md_probe(dev, NULL, NULL); | |
3805 | mddev = mddev_find(dev); | |
3806 | if (!mddev) { | |
3807 | printk(KERN_ERR | |
3808 | "md: cannot allocate memory for md drive.\n"); | |
3809 | break; | |
3810 | } | |
3811 | if (mddev_lock(mddev)) | |
3812 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
3813 | mdname(mddev)); | |
3814 | else if (mddev->raid_disks || mddev->major_version | |
3815 | || !list_empty(&mddev->disks)) { | |
3816 | printk(KERN_WARNING | |
3817 | "md: %s already running, cannot run %s\n", | |
3818 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
3819 | mddev_unlock(mddev); | |
3820 | } else { | |
3821 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 3822 | mddev->persistent = 1; |
73c34431 | 3823 | rdev_for_each_list(rdev, tmp, candidates) { |
1da177e4 LT |
3824 | list_del_init(&rdev->same_set); |
3825 | if (bind_rdev_to_array(rdev, mddev)) | |
3826 | export_rdev(rdev); | |
3827 | } | |
3828 | autorun_array(mddev); | |
3829 | mddev_unlock(mddev); | |
3830 | } | |
3831 | /* on success, candidates will be empty, on error | |
3832 | * it won't... | |
3833 | */ | |
73c34431 | 3834 | rdev_for_each_list(rdev, tmp, candidates) |
1da177e4 LT |
3835 | export_rdev(rdev); |
3836 | mddev_put(mddev); | |
3837 | } | |
3838 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
3839 | } | |
fdee8ae4 | 3840 | #endif /* !MODULE */ |
1da177e4 | 3841 | |
1da177e4 LT |
3842 | static int get_version(void __user * arg) |
3843 | { | |
3844 | mdu_version_t ver; | |
3845 | ||
3846 | ver.major = MD_MAJOR_VERSION; | |
3847 | ver.minor = MD_MINOR_VERSION; | |
3848 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
3849 | ||
3850 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
3851 | return -EFAULT; | |
3852 | ||
3853 | return 0; | |
3854 | } | |
3855 | ||
3856 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
3857 | { | |
3858 | mdu_array_info_t info; | |
3859 | int nr,working,active,failed,spare; | |
3860 | mdk_rdev_t *rdev; | |
3861 | struct list_head *tmp; | |
3862 | ||
3863 | nr=working=active=failed=spare=0; | |
d089c6af | 3864 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 | 3865 | nr++; |
b2d444d7 | 3866 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3867 | failed++; |
3868 | else { | |
3869 | working++; | |
b2d444d7 | 3870 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
3871 | active++; |
3872 | else | |
3873 | spare++; | |
3874 | } | |
3875 | } | |
3876 | ||
3877 | info.major_version = mddev->major_version; | |
3878 | info.minor_version = mddev->minor_version; | |
3879 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
3880 | info.ctime = mddev->ctime; | |
3881 | info.level = mddev->level; | |
3882 | info.size = mddev->size; | |
284ae7ca N |
3883 | if (info.size != mddev->size) /* overflow */ |
3884 | info.size = -1; | |
1da177e4 LT |
3885 | info.nr_disks = nr; |
3886 | info.raid_disks = mddev->raid_disks; | |
3887 | info.md_minor = mddev->md_minor; | |
3888 | info.not_persistent= !mddev->persistent; | |
3889 | ||
3890 | info.utime = mddev->utime; | |
3891 | info.state = 0; | |
3892 | if (mddev->in_sync) | |
3893 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
3894 | if (mddev->bitmap && mddev->bitmap_offset) |
3895 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3896 | info.active_disks = active; |
3897 | info.working_disks = working; | |
3898 | info.failed_disks = failed; | |
3899 | info.spare_disks = spare; | |
3900 | ||
3901 | info.layout = mddev->layout; | |
3902 | info.chunk_size = mddev->chunk_size; | |
3903 | ||
3904 | if (copy_to_user(arg, &info, sizeof(info))) | |
3905 | return -EFAULT; | |
3906 | ||
3907 | return 0; | |
3908 | } | |
3909 | ||
87162a28 | 3910 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
3911 | { |
3912 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
3913 | char *ptr, *buf = NULL; | |
3914 | int err = -ENOMEM; | |
3915 | ||
2a2275d6 N |
3916 | md_allow_write(mddev); |
3917 | ||
32a7627c N |
3918 | file = kmalloc(sizeof(*file), GFP_KERNEL); |
3919 | if (!file) | |
3920 | goto out; | |
3921 | ||
3922 | /* bitmap disabled, zero the first byte and copy out */ | |
3923 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
3924 | file->pathname[0] = '\0'; | |
3925 | goto copy_out; | |
3926 | } | |
3927 | ||
3928 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
3929 | if (!buf) | |
3930 | goto out; | |
3931 | ||
3932 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
3933 | if (!ptr) | |
3934 | goto out; | |
3935 | ||
3936 | strcpy(file->pathname, ptr); | |
3937 | ||
3938 | copy_out: | |
3939 | err = 0; | |
3940 | if (copy_to_user(arg, file, sizeof(*file))) | |
3941 | err = -EFAULT; | |
3942 | out: | |
3943 | kfree(buf); | |
3944 | kfree(file); | |
3945 | return err; | |
3946 | } | |
3947 | ||
1da177e4 LT |
3948 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
3949 | { | |
3950 | mdu_disk_info_t info; | |
3951 | unsigned int nr; | |
3952 | mdk_rdev_t *rdev; | |
3953 | ||
3954 | if (copy_from_user(&info, arg, sizeof(info))) | |
3955 | return -EFAULT; | |
3956 | ||
3957 | nr = info.number; | |
3958 | ||
3959 | rdev = find_rdev_nr(mddev, nr); | |
3960 | if (rdev) { | |
3961 | info.major = MAJOR(rdev->bdev->bd_dev); | |
3962 | info.minor = MINOR(rdev->bdev->bd_dev); | |
3963 | info.raid_disk = rdev->raid_disk; | |
3964 | info.state = 0; | |
b2d444d7 | 3965 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3966 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 3967 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
3968 | info.state |= (1<<MD_DISK_ACTIVE); |
3969 | info.state |= (1<<MD_DISK_SYNC); | |
3970 | } | |
8ddf9efe N |
3971 | if (test_bit(WriteMostly, &rdev->flags)) |
3972 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
3973 | } else { |
3974 | info.major = info.minor = 0; | |
3975 | info.raid_disk = -1; | |
3976 | info.state = (1<<MD_DISK_REMOVED); | |
3977 | } | |
3978 | ||
3979 | if (copy_to_user(arg, &info, sizeof(info))) | |
3980 | return -EFAULT; | |
3981 | ||
3982 | return 0; | |
3983 | } | |
3984 | ||
3985 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
3986 | { | |
3987 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3988 | mdk_rdev_t *rdev; | |
3989 | dev_t dev = MKDEV(info->major,info->minor); | |
3990 | ||
3991 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
3992 | return -EOVERFLOW; | |
3993 | ||
3994 | if (!mddev->raid_disks) { | |
3995 | int err; | |
3996 | /* expecting a device which has a superblock */ | |
3997 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
3998 | if (IS_ERR(rdev)) { | |
3999 | printk(KERN_WARNING | |
4000 | "md: md_import_device returned %ld\n", | |
4001 | PTR_ERR(rdev)); | |
4002 | return PTR_ERR(rdev); | |
4003 | } | |
4004 | if (!list_empty(&mddev->disks)) { | |
4005 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4006 | mdk_rdev_t, same_set); | |
4007 | int err = super_types[mddev->major_version] | |
4008 | .load_super(rdev, rdev0, mddev->minor_version); | |
4009 | if (err < 0) { | |
4010 | printk(KERN_WARNING | |
4011 | "md: %s has different UUID to %s\n", | |
4012 | bdevname(rdev->bdev,b), | |
4013 | bdevname(rdev0->bdev,b2)); | |
4014 | export_rdev(rdev); | |
4015 | return -EINVAL; | |
4016 | } | |
4017 | } | |
4018 | err = bind_rdev_to_array(rdev, mddev); | |
4019 | if (err) | |
4020 | export_rdev(rdev); | |
4021 | return err; | |
4022 | } | |
4023 | ||
4024 | /* | |
4025 | * add_new_disk can be used once the array is assembled | |
4026 | * to add "hot spares". They must already have a superblock | |
4027 | * written | |
4028 | */ | |
4029 | if (mddev->pers) { | |
4030 | int err; | |
4031 | if (!mddev->pers->hot_add_disk) { | |
4032 | printk(KERN_WARNING | |
4033 | "%s: personality does not support diskops!\n", | |
4034 | mdname(mddev)); | |
4035 | return -EINVAL; | |
4036 | } | |
7b1e35f6 N |
4037 | if (mddev->persistent) |
4038 | rdev = md_import_device(dev, mddev->major_version, | |
4039 | mddev->minor_version); | |
4040 | else | |
4041 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4042 | if (IS_ERR(rdev)) { |
4043 | printk(KERN_WARNING | |
4044 | "md: md_import_device returned %ld\n", | |
4045 | PTR_ERR(rdev)); | |
4046 | return PTR_ERR(rdev); | |
4047 | } | |
41158c7e N |
4048 | /* set save_raid_disk if appropriate */ |
4049 | if (!mddev->persistent) { | |
4050 | if (info->state & (1<<MD_DISK_SYNC) && | |
4051 | info->raid_disk < mddev->raid_disks) | |
4052 | rdev->raid_disk = info->raid_disk; | |
4053 | else | |
4054 | rdev->raid_disk = -1; | |
4055 | } else | |
4056 | super_types[mddev->major_version]. | |
4057 | validate_super(mddev, rdev); | |
4058 | rdev->saved_raid_disk = rdev->raid_disk; | |
4059 | ||
b2d444d7 | 4060 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4061 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4062 | set_bit(WriteMostly, &rdev->flags); | |
4063 | ||
1da177e4 LT |
4064 | rdev->raid_disk = -1; |
4065 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4066 | if (!err && !mddev->pers->hot_remove_disk) { |
4067 | /* If there is hot_add_disk but no hot_remove_disk | |
4068 | * then added disks for geometry changes, | |
4069 | * and should be added immediately. | |
4070 | */ | |
4071 | super_types[mddev->major_version]. | |
4072 | validate_super(mddev, rdev); | |
4073 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4074 | if (err) | |
4075 | unbind_rdev_from_array(rdev); | |
4076 | } | |
1da177e4 LT |
4077 | if (err) |
4078 | export_rdev(rdev); | |
c361777f | 4079 | |
17571284 | 4080 | md_update_sb(mddev, 1); |
c361777f | 4081 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4082 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4083 | return err; |
4084 | } | |
4085 | ||
4086 | /* otherwise, add_new_disk is only allowed | |
4087 | * for major_version==0 superblocks | |
4088 | */ | |
4089 | if (mddev->major_version != 0) { | |
4090 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4091 | mdname(mddev)); | |
4092 | return -EINVAL; | |
4093 | } | |
4094 | ||
4095 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4096 | int err; | |
4097 | rdev = md_import_device (dev, -1, 0); | |
4098 | if (IS_ERR(rdev)) { | |
4099 | printk(KERN_WARNING | |
4100 | "md: error, md_import_device() returned %ld\n", | |
4101 | PTR_ERR(rdev)); | |
4102 | return PTR_ERR(rdev); | |
4103 | } | |
4104 | rdev->desc_nr = info->number; | |
4105 | if (info->raid_disk < mddev->raid_disks) | |
4106 | rdev->raid_disk = info->raid_disk; | |
4107 | else | |
4108 | rdev->raid_disk = -1; | |
4109 | ||
1da177e4 | 4110 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4111 | if (info->state & (1<<MD_DISK_SYNC)) |
4112 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4113 | |
8ddf9efe N |
4114 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4115 | set_bit(WriteMostly, &rdev->flags); | |
4116 | ||
1da177e4 LT |
4117 | if (!mddev->persistent) { |
4118 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
4119 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
4120 | } else | |
4121 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
4122 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
4123 | ||
2bf071bf N |
4124 | err = bind_rdev_to_array(rdev, mddev); |
4125 | if (err) { | |
4126 | export_rdev(rdev); | |
4127 | return err; | |
4128 | } | |
1da177e4 LT |
4129 | } |
4130 | ||
4131 | return 0; | |
4132 | } | |
4133 | ||
4134 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4135 | { | |
4136 | char b[BDEVNAME_SIZE]; | |
4137 | mdk_rdev_t *rdev; | |
4138 | ||
4139 | if (!mddev->pers) | |
4140 | return -ENODEV; | |
4141 | ||
4142 | rdev = find_rdev(mddev, dev); | |
4143 | if (!rdev) | |
4144 | return -ENXIO; | |
4145 | ||
4146 | if (rdev->raid_disk >= 0) | |
4147 | goto busy; | |
4148 | ||
4149 | kick_rdev_from_array(rdev); | |
850b2b42 | 4150 | md_update_sb(mddev, 1); |
d7603b7e | 4151 | md_new_event(mddev); |
1da177e4 LT |
4152 | |
4153 | return 0; | |
4154 | busy: | |
fdefa4d8 | 4155 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4156 | bdevname(rdev->bdev,b), mdname(mddev)); |
4157 | return -EBUSY; | |
4158 | } | |
4159 | ||
4160 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4161 | { | |
4162 | char b[BDEVNAME_SIZE]; | |
4163 | int err; | |
4164 | unsigned int size; | |
4165 | mdk_rdev_t *rdev; | |
4166 | ||
4167 | if (!mddev->pers) | |
4168 | return -ENODEV; | |
4169 | ||
4170 | if (mddev->major_version != 0) { | |
4171 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4172 | " version-0 superblocks.\n", | |
4173 | mdname(mddev)); | |
4174 | return -EINVAL; | |
4175 | } | |
4176 | if (!mddev->pers->hot_add_disk) { | |
4177 | printk(KERN_WARNING | |
4178 | "%s: personality does not support diskops!\n", | |
4179 | mdname(mddev)); | |
4180 | return -EINVAL; | |
4181 | } | |
4182 | ||
4183 | rdev = md_import_device (dev, -1, 0); | |
4184 | if (IS_ERR(rdev)) { | |
4185 | printk(KERN_WARNING | |
4186 | "md: error, md_import_device() returned %ld\n", | |
4187 | PTR_ERR(rdev)); | |
4188 | return -EINVAL; | |
4189 | } | |
4190 | ||
4191 | if (mddev->persistent) | |
4192 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
4193 | else | |
4194 | rdev->sb_offset = | |
4195 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
4196 | ||
4197 | size = calc_dev_size(rdev, mddev->chunk_size); | |
4198 | rdev->size = size; | |
4199 | ||
b2d444d7 | 4200 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4201 | printk(KERN_WARNING |
4202 | "md: can not hot-add faulty %s disk to %s!\n", | |
4203 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4204 | err = -EINVAL; | |
4205 | goto abort_export; | |
4206 | } | |
b2d444d7 | 4207 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4208 | rdev->desc_nr = -1; |
5842730d | 4209 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4210 | err = bind_rdev_to_array(rdev, mddev); |
4211 | if (err) | |
4212 | goto abort_export; | |
1da177e4 LT |
4213 | |
4214 | /* | |
4215 | * The rest should better be atomic, we can have disk failures | |
4216 | * noticed in interrupt contexts ... | |
4217 | */ | |
4218 | ||
4219 | if (rdev->desc_nr == mddev->max_disks) { | |
4220 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4221 | mdname(mddev)); | |
4222 | err = -EBUSY; | |
4223 | goto abort_unbind_export; | |
4224 | } | |
4225 | ||
4226 | rdev->raid_disk = -1; | |
4227 | ||
850b2b42 | 4228 | md_update_sb(mddev, 1); |
1da177e4 LT |
4229 | |
4230 | /* | |
4231 | * Kick recovery, maybe this spare has to be added to the | |
4232 | * array immediately. | |
4233 | */ | |
4234 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4235 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4236 | md_new_event(mddev); |
1da177e4 LT |
4237 | return 0; |
4238 | ||
4239 | abort_unbind_export: | |
4240 | unbind_rdev_from_array(rdev); | |
4241 | ||
4242 | abort_export: | |
4243 | export_rdev(rdev); | |
4244 | return err; | |
4245 | } | |
4246 | ||
32a7627c N |
4247 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4248 | { | |
4249 | int err; | |
4250 | ||
36fa3063 N |
4251 | if (mddev->pers) { |
4252 | if (!mddev->pers->quiesce) | |
4253 | return -EBUSY; | |
4254 | if (mddev->recovery || mddev->sync_thread) | |
4255 | return -EBUSY; | |
4256 | /* we should be able to change the bitmap.. */ | |
4257 | } | |
32a7627c | 4258 | |
32a7627c | 4259 | |
36fa3063 N |
4260 | if (fd >= 0) { |
4261 | if (mddev->bitmap) | |
4262 | return -EEXIST; /* cannot add when bitmap is present */ | |
4263 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4264 | |
36fa3063 N |
4265 | if (mddev->bitmap_file == NULL) { |
4266 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4267 | mdname(mddev)); | |
4268 | return -EBADF; | |
4269 | } | |
4270 | ||
4271 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4272 | if (err) { | |
4273 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4274 | mdname(mddev)); | |
4275 | fput(mddev->bitmap_file); | |
4276 | mddev->bitmap_file = NULL; | |
4277 | return err; | |
4278 | } | |
a654b9d8 | 4279 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4280 | } else if (mddev->bitmap == NULL) |
4281 | return -ENOENT; /* cannot remove what isn't there */ | |
4282 | err = 0; | |
4283 | if (mddev->pers) { | |
4284 | mddev->pers->quiesce(mddev, 1); | |
4285 | if (fd >= 0) | |
4286 | err = bitmap_create(mddev); | |
d7375ab3 | 4287 | if (fd < 0 || err) { |
36fa3063 | 4288 | bitmap_destroy(mddev); |
d7375ab3 N |
4289 | fd = -1; /* make sure to put the file */ |
4290 | } | |
36fa3063 | 4291 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4292 | } |
4293 | if (fd < 0) { | |
acc55e22 N |
4294 | if (mddev->bitmap_file) { |
4295 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4296 | fput(mddev->bitmap_file); |
acc55e22 | 4297 | } |
36fa3063 N |
4298 | mddev->bitmap_file = NULL; |
4299 | } | |
4300 | ||
32a7627c N |
4301 | return err; |
4302 | } | |
4303 | ||
1da177e4 LT |
4304 | /* |
4305 | * set_array_info is used two different ways | |
4306 | * The original usage is when creating a new array. | |
4307 | * In this usage, raid_disks is > 0 and it together with | |
4308 | * level, size, not_persistent,layout,chunksize determine the | |
4309 | * shape of the array. | |
4310 | * This will always create an array with a type-0.90.0 superblock. | |
4311 | * The newer usage is when assembling an array. | |
4312 | * In this case raid_disks will be 0, and the major_version field is | |
4313 | * use to determine which style super-blocks are to be found on the devices. | |
4314 | * The minor and patch _version numbers are also kept incase the | |
4315 | * super_block handler wishes to interpret them. | |
4316 | */ | |
4317 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4318 | { | |
4319 | ||
4320 | if (info->raid_disks == 0) { | |
4321 | /* just setting version number for superblock loading */ | |
4322 | if (info->major_version < 0 || | |
50511da3 | 4323 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4324 | super_types[info->major_version].name == NULL) { |
4325 | /* maybe try to auto-load a module? */ | |
4326 | printk(KERN_INFO | |
4327 | "md: superblock version %d not known\n", | |
4328 | info->major_version); | |
4329 | return -EINVAL; | |
4330 | } | |
4331 | mddev->major_version = info->major_version; | |
4332 | mddev->minor_version = info->minor_version; | |
4333 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4334 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4335 | return 0; |
4336 | } | |
4337 | mddev->major_version = MD_MAJOR_VERSION; | |
4338 | mddev->minor_version = MD_MINOR_VERSION; | |
4339 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4340 | mddev->ctime = get_seconds(); | |
4341 | ||
4342 | mddev->level = info->level; | |
17115e03 | 4343 | mddev->clevel[0] = 0; |
1da177e4 LT |
4344 | mddev->size = info->size; |
4345 | mddev->raid_disks = info->raid_disks; | |
4346 | /* don't set md_minor, it is determined by which /dev/md* was | |
4347 | * openned | |
4348 | */ | |
4349 | if (info->state & (1<<MD_SB_CLEAN)) | |
4350 | mddev->recovery_cp = MaxSector; | |
4351 | else | |
4352 | mddev->recovery_cp = 0; | |
4353 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4354 | mddev->external = 0; |
1da177e4 LT |
4355 | |
4356 | mddev->layout = info->layout; | |
4357 | mddev->chunk_size = info->chunk_size; | |
4358 | ||
4359 | mddev->max_disks = MD_SB_DISKS; | |
4360 | ||
e691063a N |
4361 | if (mddev->persistent) |
4362 | mddev->flags = 0; | |
850b2b42 | 4363 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4364 | |
b2a2703c N |
4365 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4366 | mddev->bitmap_offset = 0; | |
4367 | ||
f6705578 N |
4368 | mddev->reshape_position = MaxSector; |
4369 | ||
1da177e4 LT |
4370 | /* |
4371 | * Generate a 128 bit UUID | |
4372 | */ | |
4373 | get_random_bytes(mddev->uuid, 16); | |
4374 | ||
f6705578 N |
4375 | mddev->new_level = mddev->level; |
4376 | mddev->new_chunk = mddev->chunk_size; | |
4377 | mddev->new_layout = mddev->layout; | |
4378 | mddev->delta_disks = 0; | |
4379 | ||
1da177e4 LT |
4380 | return 0; |
4381 | } | |
4382 | ||
a35b0d69 N |
4383 | static int update_size(mddev_t *mddev, unsigned long size) |
4384 | { | |
4385 | mdk_rdev_t * rdev; | |
4386 | int rv; | |
4387 | struct list_head *tmp; | |
8ddeeae5 | 4388 | int fit = (size == 0); |
a35b0d69 N |
4389 | |
4390 | if (mddev->pers->resize == NULL) | |
4391 | return -EINVAL; | |
4392 | /* The "size" is the amount of each device that is used. | |
4393 | * This can only make sense for arrays with redundancy. | |
4394 | * linear and raid0 always use whatever space is available | |
4395 | * We can only consider changing the size if no resync | |
4396 | * or reconstruction is happening, and if the new size | |
4397 | * is acceptable. It must fit before the sb_offset or, | |
4398 | * if that is <data_offset, it must fit before the | |
4399 | * size of each device. | |
4400 | * If size is zero, we find the largest size that fits. | |
4401 | */ | |
4402 | if (mddev->sync_thread) | |
4403 | return -EBUSY; | |
d089c6af | 4404 | rdev_for_each(rdev, tmp, mddev) { |
a35b0d69 | 4405 | sector_t avail; |
01ab5662 N |
4406 | avail = rdev->size * 2; |
4407 | ||
a35b0d69 N |
4408 | if (fit && (size == 0 || size > avail/2)) |
4409 | size = avail/2; | |
4410 | if (avail < ((sector_t)size << 1)) | |
4411 | return -ENOSPC; | |
4412 | } | |
4413 | rv = mddev->pers->resize(mddev, (sector_t)size *2); | |
4414 | if (!rv) { | |
4415 | struct block_device *bdev; | |
4416 | ||
4417 | bdev = bdget_disk(mddev->gendisk, 0); | |
4418 | if (bdev) { | |
1b1dcc1b | 4419 | mutex_lock(&bdev->bd_inode->i_mutex); |
6d89332b | 4420 | i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10); |
1b1dcc1b | 4421 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4422 | bdput(bdev); |
4423 | } | |
4424 | } | |
4425 | return rv; | |
4426 | } | |
4427 | ||
da943b99 N |
4428 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4429 | { | |
4430 | int rv; | |
4431 | /* change the number of raid disks */ | |
63c70c4f | 4432 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4433 | return -EINVAL; |
4434 | if (raid_disks <= 0 || | |
4435 | raid_disks >= mddev->max_disks) | |
4436 | return -EINVAL; | |
63c70c4f | 4437 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4438 | return -EBUSY; |
63c70c4f N |
4439 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4440 | ||
4441 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4442 | return rv; |
4443 | } | |
4444 | ||
4445 | ||
1da177e4 LT |
4446 | /* |
4447 | * update_array_info is used to change the configuration of an | |
4448 | * on-line array. | |
4449 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4450 | * fields in the info are checked against the array. | |
4451 | * Any differences that cannot be handled will cause an error. | |
4452 | * Normally, only one change can be managed at a time. | |
4453 | */ | |
4454 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4455 | { | |
4456 | int rv = 0; | |
4457 | int cnt = 0; | |
36fa3063 N |
4458 | int state = 0; |
4459 | ||
4460 | /* calculate expected state,ignoring low bits */ | |
4461 | if (mddev->bitmap && mddev->bitmap_offset) | |
4462 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4463 | |
4464 | if (mddev->major_version != info->major_version || | |
4465 | mddev->minor_version != info->minor_version || | |
4466 | /* mddev->patch_version != info->patch_version || */ | |
4467 | mddev->ctime != info->ctime || | |
4468 | mddev->level != info->level || | |
4469 | /* mddev->layout != info->layout || */ | |
4470 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4471 | mddev->chunk_size != info->chunk_size || |
4472 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4473 | ((state^info->state) & 0xfffffe00) | |
4474 | ) | |
1da177e4 LT |
4475 | return -EINVAL; |
4476 | /* Check there is only one change */ | |
284ae7ca | 4477 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4478 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4479 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4480 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4481 | if (cnt == 0) return 0; |
4482 | if (cnt > 1) return -EINVAL; | |
4483 | ||
4484 | if (mddev->layout != info->layout) { | |
4485 | /* Change layout | |
4486 | * we don't need to do anything at the md level, the | |
4487 | * personality will take care of it all. | |
4488 | */ | |
4489 | if (mddev->pers->reconfig == NULL) | |
4490 | return -EINVAL; | |
4491 | else | |
4492 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4493 | } | |
284ae7ca | 4494 | if (info->size >= 0 && mddev->size != info->size) |
a35b0d69 N |
4495 | rv = update_size(mddev, info->size); |
4496 | ||
da943b99 N |
4497 | if (mddev->raid_disks != info->raid_disks) |
4498 | rv = update_raid_disks(mddev, info->raid_disks); | |
4499 | ||
36fa3063 N |
4500 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4501 | if (mddev->pers->quiesce == NULL) | |
4502 | return -EINVAL; | |
4503 | if (mddev->recovery || mddev->sync_thread) | |
4504 | return -EBUSY; | |
4505 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4506 | /* add the bitmap */ | |
4507 | if (mddev->bitmap) | |
4508 | return -EEXIST; | |
4509 | if (mddev->default_bitmap_offset == 0) | |
4510 | return -EINVAL; | |
4511 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4512 | mddev->pers->quiesce(mddev, 1); | |
4513 | rv = bitmap_create(mddev); | |
4514 | if (rv) | |
4515 | bitmap_destroy(mddev); | |
4516 | mddev->pers->quiesce(mddev, 0); | |
4517 | } else { | |
4518 | /* remove the bitmap */ | |
4519 | if (!mddev->bitmap) | |
4520 | return -ENOENT; | |
4521 | if (mddev->bitmap->file) | |
4522 | return -EINVAL; | |
4523 | mddev->pers->quiesce(mddev, 1); | |
4524 | bitmap_destroy(mddev); | |
4525 | mddev->pers->quiesce(mddev, 0); | |
4526 | mddev->bitmap_offset = 0; | |
4527 | } | |
4528 | } | |
850b2b42 | 4529 | md_update_sb(mddev, 1); |
1da177e4 LT |
4530 | return rv; |
4531 | } | |
4532 | ||
4533 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4534 | { | |
4535 | mdk_rdev_t *rdev; | |
4536 | ||
4537 | if (mddev->pers == NULL) | |
4538 | return -ENODEV; | |
4539 | ||
4540 | rdev = find_rdev(mddev, dev); | |
4541 | if (!rdev) | |
4542 | return -ENODEV; | |
4543 | ||
4544 | md_error(mddev, rdev); | |
4545 | return 0; | |
4546 | } | |
4547 | ||
a885c8c4 CH |
4548 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4549 | { | |
4550 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4551 | ||
4552 | geo->heads = 2; | |
4553 | geo->sectors = 4; | |
4554 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4555 | return 0; | |
4556 | } | |
4557 | ||
1da177e4 LT |
4558 | static int md_ioctl(struct inode *inode, struct file *file, |
4559 | unsigned int cmd, unsigned long arg) | |
4560 | { | |
4561 | int err = 0; | |
4562 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4563 | mddev_t *mddev = NULL; |
4564 | ||
4565 | if (!capable(CAP_SYS_ADMIN)) | |
4566 | return -EACCES; | |
4567 | ||
4568 | /* | |
4569 | * Commands dealing with the RAID driver but not any | |
4570 | * particular array: | |
4571 | */ | |
4572 | switch (cmd) | |
4573 | { | |
4574 | case RAID_VERSION: | |
4575 | err = get_version(argp); | |
4576 | goto done; | |
4577 | ||
4578 | case PRINT_RAID_DEBUG: | |
4579 | err = 0; | |
4580 | md_print_devices(); | |
4581 | goto done; | |
4582 | ||
4583 | #ifndef MODULE | |
4584 | case RAID_AUTORUN: | |
4585 | err = 0; | |
4586 | autostart_arrays(arg); | |
4587 | goto done; | |
4588 | #endif | |
4589 | default:; | |
4590 | } | |
4591 | ||
4592 | /* | |
4593 | * Commands creating/starting a new array: | |
4594 | */ | |
4595 | ||
4596 | mddev = inode->i_bdev->bd_disk->private_data; | |
4597 | ||
4598 | if (!mddev) { | |
4599 | BUG(); | |
4600 | goto abort; | |
4601 | } | |
4602 | ||
1da177e4 LT |
4603 | err = mddev_lock(mddev); |
4604 | if (err) { | |
4605 | printk(KERN_INFO | |
4606 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4607 | err, cmd); | |
4608 | goto abort; | |
4609 | } | |
4610 | ||
4611 | switch (cmd) | |
4612 | { | |
4613 | case SET_ARRAY_INFO: | |
4614 | { | |
4615 | mdu_array_info_t info; | |
4616 | if (!arg) | |
4617 | memset(&info, 0, sizeof(info)); | |
4618 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4619 | err = -EFAULT; | |
4620 | goto abort_unlock; | |
4621 | } | |
4622 | if (mddev->pers) { | |
4623 | err = update_array_info(mddev, &info); | |
4624 | if (err) { | |
4625 | printk(KERN_WARNING "md: couldn't update" | |
4626 | " array info. %d\n", err); | |
4627 | goto abort_unlock; | |
4628 | } | |
4629 | goto done_unlock; | |
4630 | } | |
4631 | if (!list_empty(&mddev->disks)) { | |
4632 | printk(KERN_WARNING | |
4633 | "md: array %s already has disks!\n", | |
4634 | mdname(mddev)); | |
4635 | err = -EBUSY; | |
4636 | goto abort_unlock; | |
4637 | } | |
4638 | if (mddev->raid_disks) { | |
4639 | printk(KERN_WARNING | |
4640 | "md: array %s already initialised!\n", | |
4641 | mdname(mddev)); | |
4642 | err = -EBUSY; | |
4643 | goto abort_unlock; | |
4644 | } | |
4645 | err = set_array_info(mddev, &info); | |
4646 | if (err) { | |
4647 | printk(KERN_WARNING "md: couldn't set" | |
4648 | " array info. %d\n", err); | |
4649 | goto abort_unlock; | |
4650 | } | |
4651 | } | |
4652 | goto done_unlock; | |
4653 | ||
4654 | default:; | |
4655 | } | |
4656 | ||
4657 | /* | |
4658 | * Commands querying/configuring an existing array: | |
4659 | */ | |
32a7627c | 4660 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 4661 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
4662 | if ((!mddev->raid_disks && !mddev->external) |
4663 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
4664 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
4665 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
4666 | err = -ENODEV; |
4667 | goto abort_unlock; | |
4668 | } | |
4669 | ||
4670 | /* | |
4671 | * Commands even a read-only array can execute: | |
4672 | */ | |
4673 | switch (cmd) | |
4674 | { | |
4675 | case GET_ARRAY_INFO: | |
4676 | err = get_array_info(mddev, argp); | |
4677 | goto done_unlock; | |
4678 | ||
32a7627c | 4679 | case GET_BITMAP_FILE: |
87162a28 | 4680 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
4681 | goto done_unlock; |
4682 | ||
1da177e4 LT |
4683 | case GET_DISK_INFO: |
4684 | err = get_disk_info(mddev, argp); | |
4685 | goto done_unlock; | |
4686 | ||
4687 | case RESTART_ARRAY_RW: | |
4688 | err = restart_array(mddev); | |
4689 | goto done_unlock; | |
4690 | ||
4691 | case STOP_ARRAY: | |
4692 | err = do_md_stop (mddev, 0); | |
4693 | goto done_unlock; | |
4694 | ||
4695 | case STOP_ARRAY_RO: | |
4696 | err = do_md_stop (mddev, 1); | |
4697 | goto done_unlock; | |
4698 | ||
4699 | /* | |
4700 | * We have a problem here : there is no easy way to give a CHS | |
4701 | * virtual geometry. We currently pretend that we have a 2 heads | |
4702 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4703 | * dosfs just mad... ;-) | |
4704 | */ | |
1da177e4 LT |
4705 | } |
4706 | ||
4707 | /* | |
4708 | * The remaining ioctls are changing the state of the | |
f91de92e N |
4709 | * superblock, so we do not allow them on read-only arrays. |
4710 | * However non-MD ioctls (e.g. get-size) will still come through | |
4711 | * here and hit the 'default' below, so only disallow | |
4712 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 4713 | */ |
f91de92e N |
4714 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
4715 | mddev->ro && mddev->pers) { | |
4716 | if (mddev->ro == 2) { | |
4717 | mddev->ro = 0; | |
4718 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4719 | md_wakeup_thread(mddev->thread); | |
4720 | ||
4721 | } else { | |
4722 | err = -EROFS; | |
4723 | goto abort_unlock; | |
4724 | } | |
1da177e4 LT |
4725 | } |
4726 | ||
4727 | switch (cmd) | |
4728 | { | |
4729 | case ADD_NEW_DISK: | |
4730 | { | |
4731 | mdu_disk_info_t info; | |
4732 | if (copy_from_user(&info, argp, sizeof(info))) | |
4733 | err = -EFAULT; | |
4734 | else | |
4735 | err = add_new_disk(mddev, &info); | |
4736 | goto done_unlock; | |
4737 | } | |
4738 | ||
4739 | case HOT_REMOVE_DISK: | |
4740 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
4741 | goto done_unlock; | |
4742 | ||
4743 | case HOT_ADD_DISK: | |
4744 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
4745 | goto done_unlock; | |
4746 | ||
4747 | case SET_DISK_FAULTY: | |
4748 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
4749 | goto done_unlock; | |
4750 | ||
4751 | case RUN_ARRAY: | |
4752 | err = do_md_run (mddev); | |
4753 | goto done_unlock; | |
4754 | ||
32a7627c N |
4755 | case SET_BITMAP_FILE: |
4756 | err = set_bitmap_file(mddev, (int)arg); | |
4757 | goto done_unlock; | |
4758 | ||
1da177e4 | 4759 | default: |
1da177e4 LT |
4760 | err = -EINVAL; |
4761 | goto abort_unlock; | |
4762 | } | |
4763 | ||
4764 | done_unlock: | |
4765 | abort_unlock: | |
4766 | mddev_unlock(mddev); | |
4767 | ||
4768 | return err; | |
4769 | done: | |
4770 | if (err) | |
4771 | MD_BUG(); | |
4772 | abort: | |
4773 | return err; | |
4774 | } | |
4775 | ||
4776 | static int md_open(struct inode *inode, struct file *file) | |
4777 | { | |
4778 | /* | |
4779 | * Succeed if we can lock the mddev, which confirms that | |
4780 | * it isn't being stopped right now. | |
4781 | */ | |
4782 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4783 | int err; | |
4784 | ||
d63a5a74 | 4785 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
4786 | goto out; |
4787 | ||
4788 | err = 0; | |
4789 | mddev_get(mddev); | |
4790 | mddev_unlock(mddev); | |
4791 | ||
4792 | check_disk_change(inode->i_bdev); | |
4793 | out: | |
4794 | return err; | |
4795 | } | |
4796 | ||
4797 | static int md_release(struct inode *inode, struct file * file) | |
4798 | { | |
4799 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4800 | ||
52e5f9d1 | 4801 | BUG_ON(!mddev); |
1da177e4 LT |
4802 | mddev_put(mddev); |
4803 | ||
4804 | return 0; | |
4805 | } | |
4806 | ||
44ce6294 LT |
4807 | static int md_media_changed(struct gendisk *disk) |
4808 | { | |
4809 | mddev_t *mddev = disk->private_data; | |
4810 | ||
4811 | return mddev->changed; | |
4812 | } | |
4813 | ||
4814 | static int md_revalidate(struct gendisk *disk) | |
4815 | { | |
4816 | mddev_t *mddev = disk->private_data; | |
4817 | ||
4818 | mddev->changed = 0; | |
4819 | return 0; | |
4820 | } | |
1da177e4 LT |
4821 | static struct block_device_operations md_fops = |
4822 | { | |
4823 | .owner = THIS_MODULE, | |
4824 | .open = md_open, | |
4825 | .release = md_release, | |
4826 | .ioctl = md_ioctl, | |
a885c8c4 | 4827 | .getgeo = md_getgeo, |
44ce6294 LT |
4828 | .media_changed = md_media_changed, |
4829 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
4830 | }; |
4831 | ||
75c96f85 | 4832 | static int md_thread(void * arg) |
1da177e4 LT |
4833 | { |
4834 | mdk_thread_t *thread = arg; | |
4835 | ||
1da177e4 LT |
4836 | /* |
4837 | * md_thread is a 'system-thread', it's priority should be very | |
4838 | * high. We avoid resource deadlocks individually in each | |
4839 | * raid personality. (RAID5 does preallocation) We also use RR and | |
4840 | * the very same RT priority as kswapd, thus we will never get | |
4841 | * into a priority inversion deadlock. | |
4842 | * | |
4843 | * we definitely have to have equal or higher priority than | |
4844 | * bdflush, otherwise bdflush will deadlock if there are too | |
4845 | * many dirty RAID5 blocks. | |
4846 | */ | |
1da177e4 | 4847 | |
6985c43f | 4848 | allow_signal(SIGKILL); |
a6fb0934 | 4849 | while (!kthread_should_stop()) { |
1da177e4 | 4850 | |
93588e22 N |
4851 | /* We need to wait INTERRUPTIBLE so that |
4852 | * we don't add to the load-average. | |
4853 | * That means we need to be sure no signals are | |
4854 | * pending | |
4855 | */ | |
4856 | if (signal_pending(current)) | |
4857 | flush_signals(current); | |
4858 | ||
4859 | wait_event_interruptible_timeout | |
4860 | (thread->wqueue, | |
4861 | test_bit(THREAD_WAKEUP, &thread->flags) | |
4862 | || kthread_should_stop(), | |
4863 | thread->timeout); | |
1da177e4 LT |
4864 | |
4865 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
4866 | ||
787453c2 | 4867 | thread->run(thread->mddev); |
1da177e4 | 4868 | } |
a6fb0934 | 4869 | |
1da177e4 LT |
4870 | return 0; |
4871 | } | |
4872 | ||
4873 | void md_wakeup_thread(mdk_thread_t *thread) | |
4874 | { | |
4875 | if (thread) { | |
4876 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
4877 | set_bit(THREAD_WAKEUP, &thread->flags); | |
4878 | wake_up(&thread->wqueue); | |
4879 | } | |
4880 | } | |
4881 | ||
4882 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
4883 | const char *name) | |
4884 | { | |
4885 | mdk_thread_t *thread; | |
1da177e4 | 4886 | |
9ffae0cf | 4887 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
4888 | if (!thread) |
4889 | return NULL; | |
4890 | ||
1da177e4 LT |
4891 | init_waitqueue_head(&thread->wqueue); |
4892 | ||
1da177e4 LT |
4893 | thread->run = run; |
4894 | thread->mddev = mddev; | |
32a7627c | 4895 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 4896 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 4897 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
4898 | kfree(thread); |
4899 | return NULL; | |
4900 | } | |
1da177e4 LT |
4901 | return thread; |
4902 | } | |
4903 | ||
1da177e4 LT |
4904 | void md_unregister_thread(mdk_thread_t *thread) |
4905 | { | |
ba25f9dc | 4906 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
4907 | |
4908 | kthread_stop(thread->tsk); | |
1da177e4 LT |
4909 | kfree(thread); |
4910 | } | |
4911 | ||
4912 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
4913 | { | |
4914 | if (!mddev) { | |
4915 | MD_BUG(); | |
4916 | return; | |
4917 | } | |
4918 | ||
b2d444d7 | 4919 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4920 | return; |
32a7627c | 4921 | /* |
1da177e4 LT |
4922 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
4923 | mdname(mddev), | |
4924 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
4925 | __builtin_return_address(0),__builtin_return_address(1), | |
4926 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 4927 | */ |
d0a0a5ee AM |
4928 | if (!mddev->pers) |
4929 | return; | |
1da177e4 LT |
4930 | if (!mddev->pers->error_handler) |
4931 | return; | |
4932 | mddev->pers->error_handler(mddev,rdev); | |
4933 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4934 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4935 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 4936 | md_new_event_inintr(mddev); |
1da177e4 LT |
4937 | } |
4938 | ||
4939 | /* seq_file implementation /proc/mdstat */ | |
4940 | ||
4941 | static void status_unused(struct seq_file *seq) | |
4942 | { | |
4943 | int i = 0; | |
4944 | mdk_rdev_t *rdev; | |
4945 | struct list_head *tmp; | |
4946 | ||
4947 | seq_printf(seq, "unused devices: "); | |
4948 | ||
73c34431 | 4949 | rdev_for_each_list(rdev, tmp, pending_raid_disks) { |
1da177e4 LT |
4950 | char b[BDEVNAME_SIZE]; |
4951 | i++; | |
4952 | seq_printf(seq, "%s ", | |
4953 | bdevname(rdev->bdev,b)); | |
4954 | } | |
4955 | if (!i) | |
4956 | seq_printf(seq, "<none>"); | |
4957 | ||
4958 | seq_printf(seq, "\n"); | |
4959 | } | |
4960 | ||
4961 | ||
4962 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
4963 | { | |
4588b42e N |
4964 | sector_t max_blocks, resync, res; |
4965 | unsigned long dt, db, rt; | |
4966 | int scale; | |
4967 | unsigned int per_milli; | |
1da177e4 LT |
4968 | |
4969 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
4970 | ||
4971 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4972 | max_blocks = mddev->resync_max_sectors >> 1; | |
4973 | else | |
4974 | max_blocks = mddev->size; | |
4975 | ||
4976 | /* | |
4977 | * Should not happen. | |
4978 | */ | |
4979 | if (!max_blocks) { | |
4980 | MD_BUG(); | |
4981 | return; | |
4982 | } | |
4588b42e N |
4983 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
4984 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
4985 | * u32, as those are the requirements for sector_div. | |
4986 | * Thus 'scale' must be at least 10 | |
4987 | */ | |
4988 | scale = 10; | |
4989 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
4990 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
4991 | scale++; | |
4992 | } | |
4993 | res = (resync>>scale)*1000; | |
4994 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
4995 | ||
4996 | per_milli = res; | |
1da177e4 | 4997 | { |
4588b42e | 4998 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
4999 | seq_printf(seq, "["); |
5000 | for (i = 0; i < x; i++) | |
5001 | seq_printf(seq, "="); | |
5002 | seq_printf(seq, ">"); | |
5003 | for (i = 0; i < y; i++) | |
5004 | seq_printf(seq, "."); | |
5005 | seq_printf(seq, "] "); | |
5006 | } | |
4588b42e | 5007 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5008 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5009 | "reshape" : | |
61df9d91 N |
5010 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5011 | "check" : | |
5012 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5013 | "resync" : "recovery"))), | |
5014 | per_milli/10, per_milli % 10, | |
4588b42e N |
5015 | (unsigned long long) resync, |
5016 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5017 | |
5018 | /* | |
5019 | * We do not want to overflow, so the order of operands and | |
5020 | * the * 100 / 100 trick are important. We do a +1 to be | |
5021 | * safe against division by zero. We only estimate anyway. | |
5022 | * | |
5023 | * dt: time from mark until now | |
5024 | * db: blocks written from mark until now | |
5025 | * rt: remaining time | |
5026 | */ | |
5027 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5028 | if (!dt) dt++; | |
ff4e8d9a N |
5029 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5030 | - mddev->resync_mark_cnt; | |
5031 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5032 | |
5033 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5034 | ||
ff4e8d9a | 5035 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5036 | } |
5037 | ||
5038 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5039 | { | |
5040 | struct list_head *tmp; | |
5041 | loff_t l = *pos; | |
5042 | mddev_t *mddev; | |
5043 | ||
5044 | if (l >= 0x10000) | |
5045 | return NULL; | |
5046 | if (!l--) | |
5047 | /* header */ | |
5048 | return (void*)1; | |
5049 | ||
5050 | spin_lock(&all_mddevs_lock); | |
5051 | list_for_each(tmp,&all_mddevs) | |
5052 | if (!l--) { | |
5053 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5054 | mddev_get(mddev); | |
5055 | spin_unlock(&all_mddevs_lock); | |
5056 | return mddev; | |
5057 | } | |
5058 | spin_unlock(&all_mddevs_lock); | |
5059 | if (!l--) | |
5060 | return (void*)2;/* tail */ | |
5061 | return NULL; | |
5062 | } | |
5063 | ||
5064 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5065 | { | |
5066 | struct list_head *tmp; | |
5067 | mddev_t *next_mddev, *mddev = v; | |
5068 | ||
5069 | ++*pos; | |
5070 | if (v == (void*)2) | |
5071 | return NULL; | |
5072 | ||
5073 | spin_lock(&all_mddevs_lock); | |
5074 | if (v == (void*)1) | |
5075 | tmp = all_mddevs.next; | |
5076 | else | |
5077 | tmp = mddev->all_mddevs.next; | |
5078 | if (tmp != &all_mddevs) | |
5079 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5080 | else { | |
5081 | next_mddev = (void*)2; | |
5082 | *pos = 0x10000; | |
5083 | } | |
5084 | spin_unlock(&all_mddevs_lock); | |
5085 | ||
5086 | if (v != (void*)1) | |
5087 | mddev_put(mddev); | |
5088 | return next_mddev; | |
5089 | ||
5090 | } | |
5091 | ||
5092 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5093 | { | |
5094 | mddev_t *mddev = v; | |
5095 | ||
5096 | if (mddev && v != (void*)1 && v != (void*)2) | |
5097 | mddev_put(mddev); | |
5098 | } | |
5099 | ||
d7603b7e N |
5100 | struct mdstat_info { |
5101 | int event; | |
5102 | }; | |
5103 | ||
1da177e4 LT |
5104 | static int md_seq_show(struct seq_file *seq, void *v) |
5105 | { | |
5106 | mddev_t *mddev = v; | |
5107 | sector_t size; | |
5108 | struct list_head *tmp2; | |
5109 | mdk_rdev_t *rdev; | |
d7603b7e | 5110 | struct mdstat_info *mi = seq->private; |
32a7627c | 5111 | struct bitmap *bitmap; |
1da177e4 LT |
5112 | |
5113 | if (v == (void*)1) { | |
2604b703 | 5114 | struct mdk_personality *pers; |
1da177e4 LT |
5115 | seq_printf(seq, "Personalities : "); |
5116 | spin_lock(&pers_lock); | |
2604b703 N |
5117 | list_for_each_entry(pers, &pers_list, list) |
5118 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5119 | |
5120 | spin_unlock(&pers_lock); | |
5121 | seq_printf(seq, "\n"); | |
d7603b7e | 5122 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5123 | return 0; |
5124 | } | |
5125 | if (v == (void*)2) { | |
5126 | status_unused(seq); | |
5127 | return 0; | |
5128 | } | |
5129 | ||
5dc5cf7d | 5130 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5131 | return -EINTR; |
5dc5cf7d | 5132 | |
1da177e4 LT |
5133 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5134 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5135 | mddev->pers ? "" : "in"); | |
5136 | if (mddev->pers) { | |
f91de92e | 5137 | if (mddev->ro==1) |
1da177e4 | 5138 | seq_printf(seq, " (read-only)"); |
f91de92e | 5139 | if (mddev->ro==2) |
52720ae7 | 5140 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5141 | seq_printf(seq, " %s", mddev->pers->name); |
5142 | } | |
5143 | ||
5144 | size = 0; | |
d089c6af | 5145 | rdev_for_each(rdev, tmp2, mddev) { |
1da177e4 LT |
5146 | char b[BDEVNAME_SIZE]; |
5147 | seq_printf(seq, " %s[%d]", | |
5148 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5149 | if (test_bit(WriteMostly, &rdev->flags)) |
5150 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5151 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5152 | seq_printf(seq, "(F)"); |
5153 | continue; | |
b325a32e N |
5154 | } else if (rdev->raid_disk < 0) |
5155 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
5156 | size += rdev->size; |
5157 | } | |
5158 | ||
5159 | if (!list_empty(&mddev->disks)) { | |
5160 | if (mddev->pers) | |
5161 | seq_printf(seq, "\n %llu blocks", | |
5162 | (unsigned long long)mddev->array_size); | |
5163 | else | |
5164 | seq_printf(seq, "\n %llu blocks", | |
5165 | (unsigned long long)size); | |
5166 | } | |
1cd6bf19 N |
5167 | if (mddev->persistent) { |
5168 | if (mddev->major_version != 0 || | |
5169 | mddev->minor_version != 90) { | |
5170 | seq_printf(seq," super %d.%d", | |
5171 | mddev->major_version, | |
5172 | mddev->minor_version); | |
5173 | } | |
e691063a N |
5174 | } else if (mddev->external) |
5175 | seq_printf(seq, " super external:%s", | |
5176 | mddev->metadata_type); | |
5177 | else | |
1cd6bf19 | 5178 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5179 | |
5180 | if (mddev->pers) { | |
5181 | mddev->pers->status (seq, mddev); | |
5182 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
5183 | if (mddev->pers->sync_request) { |
5184 | if (mddev->curr_resync > 2) { | |
5185 | status_resync (seq, mddev); | |
5186 | seq_printf(seq, "\n "); | |
5187 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5188 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5189 | else if (mddev->recovery_cp < MaxSector) | |
5190 | seq_printf(seq, "\tresync=PENDING\n "); | |
5191 | } | |
32a7627c N |
5192 | } else |
5193 | seq_printf(seq, "\n "); | |
5194 | ||
5195 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5196 | unsigned long chunk_kb; |
5197 | unsigned long flags; | |
32a7627c N |
5198 | spin_lock_irqsave(&bitmap->lock, flags); |
5199 | chunk_kb = bitmap->chunksize >> 10; | |
5200 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5201 | "%lu%s chunk", | |
5202 | bitmap->pages - bitmap->missing_pages, | |
5203 | bitmap->pages, | |
5204 | (bitmap->pages - bitmap->missing_pages) | |
5205 | << (PAGE_SHIFT - 10), | |
5206 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5207 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5208 | if (bitmap->file) { |
5209 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5210 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5211 | } |
78d742d8 | 5212 | |
32a7627c N |
5213 | seq_printf(seq, "\n"); |
5214 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5215 | } |
5216 | ||
5217 | seq_printf(seq, "\n"); | |
5218 | } | |
5219 | mddev_unlock(mddev); | |
5220 | ||
5221 | return 0; | |
5222 | } | |
5223 | ||
5224 | static struct seq_operations md_seq_ops = { | |
5225 | .start = md_seq_start, | |
5226 | .next = md_seq_next, | |
5227 | .stop = md_seq_stop, | |
5228 | .show = md_seq_show, | |
5229 | }; | |
5230 | ||
5231 | static int md_seq_open(struct inode *inode, struct file *file) | |
5232 | { | |
5233 | int error; | |
d7603b7e N |
5234 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5235 | if (mi == NULL) | |
5236 | return -ENOMEM; | |
1da177e4 LT |
5237 | |
5238 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5239 | if (error) |
5240 | kfree(mi); | |
5241 | else { | |
5242 | struct seq_file *p = file->private_data; | |
5243 | p->private = mi; | |
5244 | mi->event = atomic_read(&md_event_count); | |
5245 | } | |
1da177e4 LT |
5246 | return error; |
5247 | } | |
5248 | ||
d7603b7e N |
5249 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5250 | { | |
5251 | struct seq_file *m = filp->private_data; | |
5252 | struct mdstat_info *mi = m->private; | |
5253 | int mask; | |
5254 | ||
5255 | poll_wait(filp, &md_event_waiters, wait); | |
5256 | ||
5257 | /* always allow read */ | |
5258 | mask = POLLIN | POLLRDNORM; | |
5259 | ||
5260 | if (mi->event != atomic_read(&md_event_count)) | |
5261 | mask |= POLLERR | POLLPRI; | |
5262 | return mask; | |
5263 | } | |
5264 | ||
fa027c2a | 5265 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5266 | .owner = THIS_MODULE, |
1da177e4 LT |
5267 | .open = md_seq_open, |
5268 | .read = seq_read, | |
5269 | .llseek = seq_lseek, | |
c3f94b40 | 5270 | .release = seq_release_private, |
d7603b7e | 5271 | .poll = mdstat_poll, |
1da177e4 LT |
5272 | }; |
5273 | ||
2604b703 | 5274 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5275 | { |
1da177e4 | 5276 | spin_lock(&pers_lock); |
2604b703 N |
5277 | list_add_tail(&p->list, &pers_list); |
5278 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5279 | spin_unlock(&pers_lock); |
5280 | return 0; | |
5281 | } | |
5282 | ||
2604b703 | 5283 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5284 | { |
2604b703 | 5285 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5286 | spin_lock(&pers_lock); |
2604b703 | 5287 | list_del_init(&p->list); |
1da177e4 LT |
5288 | spin_unlock(&pers_lock); |
5289 | return 0; | |
5290 | } | |
5291 | ||
5292 | static int is_mddev_idle(mddev_t *mddev) | |
5293 | { | |
5294 | mdk_rdev_t * rdev; | |
5295 | struct list_head *tmp; | |
5296 | int idle; | |
713f6ab1 | 5297 | long curr_events; |
1da177e4 LT |
5298 | |
5299 | idle = 1; | |
d089c6af | 5300 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 | 5301 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
a362357b JA |
5302 | curr_events = disk_stat_read(disk, sectors[0]) + |
5303 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 5304 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5305 | /* sync IO will cause sync_io to increase before the disk_stats |
5306 | * as sync_io is counted when a request starts, and | |
5307 | * disk_stats is counted when it completes. | |
5308 | * So resync activity will cause curr_events to be smaller than | |
5309 | * when there was no such activity. | |
5310 | * non-sync IO will cause disk_stat to increase without | |
5311 | * increasing sync_io so curr_events will (eventually) | |
5312 | * be larger than it was before. Once it becomes | |
5313 | * substantially larger, the test below will cause | |
5314 | * the array to appear non-idle, and resync will slow | |
5315 | * down. | |
5316 | * If there is a lot of outstanding resync activity when | |
5317 | * we set last_event to curr_events, then all that activity | |
5318 | * completing might cause the array to appear non-idle | |
5319 | * and resync will be slowed down even though there might | |
5320 | * not have been non-resync activity. This will only | |
5321 | * happen once though. 'last_events' will soon reflect | |
5322 | * the state where there is little or no outstanding | |
5323 | * resync requests, and further resync activity will | |
5324 | * always make curr_events less than last_events. | |
c0e48521 | 5325 | * |
1da177e4 | 5326 | */ |
713f6ab1 | 5327 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5328 | rdev->last_events = curr_events; |
5329 | idle = 0; | |
5330 | } | |
5331 | } | |
5332 | return idle; | |
5333 | } | |
5334 | ||
5335 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5336 | { | |
5337 | /* another "blocks" (512byte) blocks have been synced */ | |
5338 | atomic_sub(blocks, &mddev->recovery_active); | |
5339 | wake_up(&mddev->recovery_wait); | |
5340 | if (!ok) { | |
5341 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5342 | md_wakeup_thread(mddev->thread); | |
5343 | // stop recovery, signal do_sync .... | |
5344 | } | |
5345 | } | |
5346 | ||
5347 | ||
06d91a5f N |
5348 | /* md_write_start(mddev, bi) |
5349 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5350 | * in superblock) before writing, schedule a superblock update |
5351 | * and wait for it to complete. | |
06d91a5f | 5352 | */ |
3d310eb7 | 5353 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5354 | { |
06d91a5f | 5355 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5356 | return; |
06d91a5f | 5357 | |
f91de92e N |
5358 | BUG_ON(mddev->ro == 1); |
5359 | if (mddev->ro == 2) { | |
5360 | /* need to switch to read/write */ | |
5361 | mddev->ro = 0; | |
5362 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5363 | md_wakeup_thread(mddev->thread); | |
25156198 | 5364 | md_wakeup_thread(mddev->sync_thread); |
f91de92e | 5365 | } |
06d91a5f | 5366 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 5367 | if (mddev->in_sync) { |
a9701a30 | 5368 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5369 | if (mddev->in_sync) { |
5370 | mddev->in_sync = 0; | |
850b2b42 | 5371 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 N |
5372 | md_wakeup_thread(mddev->thread); |
5373 | } | |
a9701a30 | 5374 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5375 | } |
850b2b42 | 5376 | wait_event(mddev->sb_wait, mddev->flags==0); |
1da177e4 LT |
5377 | } |
5378 | ||
5379 | void md_write_end(mddev_t *mddev) | |
5380 | { | |
5381 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5382 | if (mddev->safemode == 2) | |
5383 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5384 | else if (mddev->safemode_delay) |
1da177e4 LT |
5385 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5386 | } | |
5387 | } | |
5388 | ||
2a2275d6 N |
5389 | /* md_allow_write(mddev) |
5390 | * Calling this ensures that the array is marked 'active' so that writes | |
5391 | * may proceed without blocking. It is important to call this before | |
5392 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5393 | * Must be called with mddev_lock held. | |
5394 | */ | |
5395 | void md_allow_write(mddev_t *mddev) | |
5396 | { | |
5397 | if (!mddev->pers) | |
5398 | return; | |
5399 | if (mddev->ro) | |
5400 | return; | |
5401 | ||
5402 | spin_lock_irq(&mddev->write_lock); | |
5403 | if (mddev->in_sync) { | |
5404 | mddev->in_sync = 0; | |
5405 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5406 | if (mddev->safemode_delay && | |
5407 | mddev->safemode == 0) | |
5408 | mddev->safemode = 1; | |
5409 | spin_unlock_irq(&mddev->write_lock); | |
5410 | md_update_sb(mddev, 0); | |
5411 | } else | |
5412 | spin_unlock_irq(&mddev->write_lock); | |
5413 | } | |
5414 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5415 | ||
75c96f85 | 5416 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
5417 | |
5418 | #define SYNC_MARKS 10 | |
5419 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5420 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5421 | { |
5422 | mddev_t *mddev2; | |
5423 | unsigned int currspeed = 0, | |
5424 | window; | |
57afd89f | 5425 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5426 | unsigned long mark[SYNC_MARKS]; |
5427 | sector_t mark_cnt[SYNC_MARKS]; | |
5428 | int last_mark,m; | |
5429 | struct list_head *tmp; | |
5430 | sector_t last_check; | |
57afd89f | 5431 | int skipped = 0; |
5fd6c1dc N |
5432 | struct list_head *rtmp; |
5433 | mdk_rdev_t *rdev; | |
61df9d91 | 5434 | char *desc; |
1da177e4 LT |
5435 | |
5436 | /* just incase thread restarts... */ | |
5437 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5438 | return; | |
5fd6c1dc N |
5439 | if (mddev->ro) /* never try to sync a read-only array */ |
5440 | return; | |
1da177e4 | 5441 | |
61df9d91 N |
5442 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5443 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5444 | desc = "data-check"; | |
5445 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5446 | desc = "requested-resync"; | |
5447 | else | |
5448 | desc = "resync"; | |
5449 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5450 | desc = "reshape"; | |
5451 | else | |
5452 | desc = "recovery"; | |
5453 | ||
1da177e4 LT |
5454 | /* we overload curr_resync somewhat here. |
5455 | * 0 == not engaged in resync at all | |
5456 | * 2 == checking that there is no conflict with another sync | |
5457 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5458 | * commense | |
5459 | * other == active in resync - this many blocks | |
5460 | * | |
5461 | * Before starting a resync we must have set curr_resync to | |
5462 | * 2, and then checked that every "conflicting" array has curr_resync | |
5463 | * less than ours. When we find one that is the same or higher | |
5464 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5465 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5466 | * This will mean we have to start checking from the beginning again. | |
5467 | * | |
5468 | */ | |
5469 | ||
5470 | do { | |
5471 | mddev->curr_resync = 2; | |
5472 | ||
5473 | try_again: | |
787453c2 | 5474 | if (kthread_should_stop()) { |
6985c43f | 5475 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5476 | goto skip; |
5477 | } | |
29ac4aa3 | 5478 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
5479 | if (mddev2 == mddev) |
5480 | continue; | |
5481 | if (mddev2->curr_resync && | |
5482 | match_mddev_units(mddev,mddev2)) { | |
5483 | DEFINE_WAIT(wq); | |
5484 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5485 | /* arbitrarily yield */ | |
5486 | mddev->curr_resync = 1; | |
5487 | wake_up(&resync_wait); | |
5488 | } | |
5489 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5490 | /* no need to wait here, we can wait the next | |
5491 | * time 'round when curr_resync == 2 | |
5492 | */ | |
5493 | continue; | |
787453c2 N |
5494 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
5495 | if (!kthread_should_stop() && | |
8712e553 | 5496 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5497 | printk(KERN_INFO "md: delaying %s of %s" |
5498 | " until %s has finished (they" | |
1da177e4 | 5499 | " share one or more physical units)\n", |
61df9d91 | 5500 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 LT |
5501 | mddev_put(mddev2); |
5502 | schedule(); | |
5503 | finish_wait(&resync_wait, &wq); | |
5504 | goto try_again; | |
5505 | } | |
5506 | finish_wait(&resync_wait, &wq); | |
5507 | } | |
5508 | } | |
5509 | } while (mddev->curr_resync < 2); | |
5510 | ||
5fd6c1dc | 5511 | j = 0; |
9d88883e | 5512 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5513 | /* resync follows the size requested by the personality, |
57afd89f | 5514 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5515 | */ |
5516 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5517 | mddev->resync_mismatches = 0; |
5fd6c1dc N |
5518 | /* we don't use the checkpoint if there's a bitmap */ |
5519 | if (!mddev->bitmap && | |
5520 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5521 | j = mddev->recovery_cp; | |
ccfcc3c1 N |
5522 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5523 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5524 | else { |
1da177e4 LT |
5525 | /* recovery follows the physical size of devices */ |
5526 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5527 | j = MaxSector; |
d089c6af | 5528 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
5529 | if (rdev->raid_disk >= 0 && |
5530 | !test_bit(Faulty, &rdev->flags) && | |
5531 | !test_bit(In_sync, &rdev->flags) && | |
5532 | rdev->recovery_offset < j) | |
5533 | j = rdev->recovery_offset; | |
5534 | } | |
1da177e4 | 5535 | |
61df9d91 N |
5536 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5537 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5538 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5539 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5540 | "(but not more than %d KB/sec) for %s.\n", |
5541 | speed_max(mddev), desc); | |
1da177e4 LT |
5542 | |
5543 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5544 | |
57afd89f | 5545 | io_sectors = 0; |
1da177e4 LT |
5546 | for (m = 0; m < SYNC_MARKS; m++) { |
5547 | mark[m] = jiffies; | |
57afd89f | 5548 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5549 | } |
5550 | last_mark = 0; | |
5551 | mddev->resync_mark = mark[last_mark]; | |
5552 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
5553 | ||
5554 | /* | |
5555 | * Tune reconstruction: | |
5556 | */ | |
5557 | window = 32*(PAGE_SIZE/512); | |
5558 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
5559 | window/2,(unsigned long long) max_sectors/2); | |
5560 | ||
5561 | atomic_set(&mddev->recovery_active, 0); | |
5562 | init_waitqueue_head(&mddev->recovery_wait); | |
5563 | last_check = 0; | |
5564 | ||
5565 | if (j>2) { | |
5566 | printk(KERN_INFO | |
61df9d91 N |
5567 | "md: resuming %s of %s from checkpoint.\n", |
5568 | desc, mdname(mddev)); | |
1da177e4 LT |
5569 | mddev->curr_resync = j; |
5570 | } | |
5571 | ||
5572 | while (j < max_sectors) { | |
57afd89f | 5573 | sector_t sectors; |
1da177e4 | 5574 | |
57afd89f | 5575 | skipped = 0; |
c6207277 N |
5576 | if (j >= mddev->resync_max) { |
5577 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
5578 | wait_event(mddev->recovery_wait, | |
5579 | mddev->resync_max > j | |
5580 | || kthread_should_stop()); | |
5581 | } | |
5582 | if (kthread_should_stop()) | |
5583 | goto interrupted; | |
57afd89f | 5584 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 5585 | currspeed < speed_min(mddev)); |
57afd89f | 5586 | if (sectors == 0) { |
1da177e4 LT |
5587 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
5588 | goto out; | |
5589 | } | |
57afd89f N |
5590 | |
5591 | if (!skipped) { /* actual IO requested */ | |
5592 | io_sectors += sectors; | |
5593 | atomic_add(sectors, &mddev->recovery_active); | |
5594 | } | |
5595 | ||
1da177e4 LT |
5596 | j += sectors; |
5597 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 5598 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
5599 | if (last_check == 0) |
5600 | /* this is the earliers that rebuilt will be | |
5601 | * visible in /proc/mdstat | |
5602 | */ | |
5603 | md_new_event(mddev); | |
57afd89f N |
5604 | |
5605 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
5606 | continue; |
5607 | ||
57afd89f | 5608 | last_check = io_sectors; |
1da177e4 LT |
5609 | |
5610 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
5611 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
5612 | break; | |
5613 | ||
5614 | repeat: | |
5615 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
5616 | /* step marks */ | |
5617 | int next = (last_mark+1) % SYNC_MARKS; | |
5618 | ||
5619 | mddev->resync_mark = mark[next]; | |
5620 | mddev->resync_mark_cnt = mark_cnt[next]; | |
5621 | mark[next] = jiffies; | |
57afd89f | 5622 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5623 | last_mark = next; |
5624 | } | |
5625 | ||
5626 | ||
c6207277 N |
5627 | if (kthread_should_stop()) |
5628 | goto interrupted; | |
5629 | ||
1da177e4 LT |
5630 | |
5631 | /* | |
5632 | * this loop exits only if either when we are slower than | |
5633 | * the 'hard' speed limit, or the system was IO-idle for | |
5634 | * a jiffy. | |
5635 | * the system might be non-idle CPU-wise, but we only care | |
5636 | * about not overloading the IO subsystem. (things like an | |
5637 | * e2fsck being done on the RAID array should execute fast) | |
5638 | */ | |
2ad8b1ef | 5639 | blk_unplug(mddev->queue); |
1da177e4 LT |
5640 | cond_resched(); |
5641 | ||
57afd89f N |
5642 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
5643 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 5644 | |
88202a0c N |
5645 | if (currspeed > speed_min(mddev)) { |
5646 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 5647 | !is_mddev_idle(mddev)) { |
c0e48521 | 5648 | msleep(500); |
1da177e4 LT |
5649 | goto repeat; |
5650 | } | |
5651 | } | |
5652 | } | |
61df9d91 | 5653 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
5654 | /* |
5655 | * this also signals 'finished resyncing' to md_stop | |
5656 | */ | |
5657 | out: | |
2ad8b1ef | 5658 | blk_unplug(mddev->queue); |
1da177e4 LT |
5659 | |
5660 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
5661 | ||
5662 | /* tell personality that we are finished */ | |
57afd89f | 5663 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
5664 | |
5665 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
ccfcc3c1 | 5666 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
5667 | mddev->curr_resync > 2) { |
5668 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
5669 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5670 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
5671 | printk(KERN_INFO | |
61df9d91 N |
5672 | "md: checkpointing %s of %s.\n", |
5673 | desc, mdname(mddev)); | |
5fd6c1dc N |
5674 | mddev->recovery_cp = mddev->curr_resync; |
5675 | } | |
5676 | } else | |
5677 | mddev->recovery_cp = MaxSector; | |
5678 | } else { | |
5679 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5680 | mddev->curr_resync = MaxSector; | |
d089c6af | 5681 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
5682 | if (rdev->raid_disk >= 0 && |
5683 | !test_bit(Faulty, &rdev->flags) && | |
5684 | !test_bit(In_sync, &rdev->flags) && | |
5685 | rdev->recovery_offset < mddev->curr_resync) | |
5686 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 5687 | } |
1da177e4 | 5688 | } |
17571284 | 5689 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5690 | |
1da177e4 LT |
5691 | skip: |
5692 | mddev->curr_resync = 0; | |
c6207277 N |
5693 | mddev->resync_max = MaxSector; |
5694 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
5695 | wake_up(&resync_wait); |
5696 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
5697 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
5698 | return; |
5699 | ||
5700 | interrupted: | |
5701 | /* | |
5702 | * got a signal, exit. | |
5703 | */ | |
5704 | printk(KERN_INFO | |
5705 | "md: md_do_sync() got signal ... exiting\n"); | |
5706 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5707 | goto out; | |
5708 | ||
1da177e4 | 5709 | } |
29269553 | 5710 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
5711 | |
5712 | ||
b4c4c7b8 N |
5713 | static int remove_and_add_spares(mddev_t *mddev) |
5714 | { | |
5715 | mdk_rdev_t *rdev; | |
5716 | struct list_head *rtmp; | |
5717 | int spares = 0; | |
5718 | ||
d089c6af | 5719 | rdev_for_each(rdev, rtmp, mddev) |
b4c4c7b8 | 5720 | if (rdev->raid_disk >= 0 && |
c303da6d | 5721 | !mddev->external && |
b4c4c7b8 N |
5722 | (test_bit(Faulty, &rdev->flags) || |
5723 | ! test_bit(In_sync, &rdev->flags)) && | |
5724 | atomic_read(&rdev->nr_pending)==0) { | |
5725 | if (mddev->pers->hot_remove_disk( | |
5726 | mddev, rdev->raid_disk)==0) { | |
5727 | char nm[20]; | |
5728 | sprintf(nm,"rd%d", rdev->raid_disk); | |
5729 | sysfs_remove_link(&mddev->kobj, nm); | |
5730 | rdev->raid_disk = -1; | |
5731 | } | |
5732 | } | |
5733 | ||
5734 | if (mddev->degraded) { | |
d089c6af | 5735 | rdev_for_each(rdev, rtmp, mddev) |
b4c4c7b8 N |
5736 | if (rdev->raid_disk < 0 |
5737 | && !test_bit(Faulty, &rdev->flags)) { | |
5738 | rdev->recovery_offset = 0; | |
5739 | if (mddev->pers->hot_add_disk(mddev,rdev)) { | |
5740 | char nm[20]; | |
5741 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
5742 | if (sysfs_create_link(&mddev->kobj, |
5743 | &rdev->kobj, nm)) | |
5744 | printk(KERN_WARNING | |
5745 | "md: cannot register " | |
5746 | "%s for %s\n", | |
5747 | nm, mdname(mddev)); | |
b4c4c7b8 N |
5748 | spares++; |
5749 | md_new_event(mddev); | |
5750 | } else | |
5751 | break; | |
5752 | } | |
5753 | } | |
5754 | return spares; | |
5755 | } | |
1da177e4 LT |
5756 | /* |
5757 | * This routine is regularly called by all per-raid-array threads to | |
5758 | * deal with generic issues like resync and super-block update. | |
5759 | * Raid personalities that don't have a thread (linear/raid0) do not | |
5760 | * need this as they never do any recovery or update the superblock. | |
5761 | * | |
5762 | * It does not do any resync itself, but rather "forks" off other threads | |
5763 | * to do that as needed. | |
5764 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
5765 | * "->recovery" and create a thread at ->sync_thread. | |
5766 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
5767 | * and wakeups up this thread which will reap the thread and finish up. | |
5768 | * This thread also removes any faulty devices (with nr_pending == 0). | |
5769 | * | |
5770 | * The overall approach is: | |
5771 | * 1/ if the superblock needs updating, update it. | |
5772 | * 2/ If a recovery thread is running, don't do anything else. | |
5773 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
5774 | * 4/ If there are any faulty devices, remove them. | |
5775 | * 5/ If array is degraded, try to add spares devices | |
5776 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
5777 | */ | |
5778 | void md_check_recovery(mddev_t *mddev) | |
5779 | { | |
5780 | mdk_rdev_t *rdev; | |
5781 | struct list_head *rtmp; | |
5782 | ||
5783 | ||
5f40402d N |
5784 | if (mddev->bitmap) |
5785 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
5786 | |
5787 | if (mddev->ro) | |
5788 | return; | |
fca4d848 N |
5789 | |
5790 | if (signal_pending(current)) { | |
5791 | if (mddev->pers->sync_request) { | |
5792 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
5793 | mdname(mddev)); | |
5794 | mddev->safemode = 2; | |
5795 | } | |
5796 | flush_signals(current); | |
5797 | } | |
5798 | ||
1da177e4 | 5799 | if ( ! ( |
e691063a | 5800 | (mddev->flags && !mddev->external) || |
1da177e4 | 5801 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 N |
5802 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
5803 | (mddev->safemode == 1) || | |
5804 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
5805 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
5806 | )) |
5807 | return; | |
fca4d848 | 5808 | |
df5b89b3 | 5809 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 5810 | int spares = 0; |
fca4d848 | 5811 | |
a9701a30 | 5812 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
5813 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
5814 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
5815 | mddev->in_sync = 1; | |
e691063a N |
5816 | if (mddev->persistent) |
5817 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
fca4d848 N |
5818 | } |
5819 | if (mddev->safemode == 1) | |
5820 | mddev->safemode = 0; | |
a9701a30 | 5821 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 5822 | |
850b2b42 N |
5823 | if (mddev->flags) |
5824 | md_update_sb(mddev, 0); | |
06d91a5f | 5825 | |
06d91a5f | 5826 | |
1da177e4 LT |
5827 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
5828 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
5829 | /* resync/recovery still happening */ | |
5830 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5831 | goto unlock; | |
5832 | } | |
5833 | if (mddev->sync_thread) { | |
5834 | /* resync has finished, collect result */ | |
5835 | md_unregister_thread(mddev->sync_thread); | |
5836 | mddev->sync_thread = NULL; | |
5837 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
5838 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5839 | /* success...*/ | |
5840 | /* activate any spares */ | |
5841 | mddev->pers->spare_active(mddev); | |
5842 | } | |
850b2b42 | 5843 | md_update_sb(mddev, 1); |
41158c7e N |
5844 | |
5845 | /* if array is no-longer degraded, then any saved_raid_disk | |
5846 | * information must be scrapped | |
5847 | */ | |
5848 | if (!mddev->degraded) | |
d089c6af | 5849 | rdev_for_each(rdev, rtmp, mddev) |
41158c7e N |
5850 | rdev->saved_raid_disk = -1; |
5851 | ||
1da177e4 LT |
5852 | mddev->recovery = 0; |
5853 | /* flag recovery needed just to double check */ | |
5854 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 5855 | md_new_event(mddev); |
1da177e4 LT |
5856 | goto unlock; |
5857 | } | |
24dd469d N |
5858 | /* Clear some bits that don't mean anything, but |
5859 | * might be left set | |
5860 | */ | |
5861 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5862 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5863 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5864 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 5865 | |
5fd6c1dc N |
5866 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
5867 | goto unlock; | |
1da177e4 LT |
5868 | /* no recovery is running. |
5869 | * remove any failed drives, then | |
5870 | * add spares if possible. | |
5871 | * Spare are also removed and re-added, to allow | |
5872 | * the personality to fail the re-add. | |
5873 | */ | |
1da177e4 | 5874 | |
b4c4c7b8 N |
5875 | if (mddev->reshape_position != MaxSector) { |
5876 | if (mddev->pers->check_reshape(mddev) != 0) | |
5877 | /* Cannot proceed */ | |
5878 | goto unlock; | |
5879 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5880 | } else if ((spares = remove_and_add_spares(mddev))) { | |
24dd469d N |
5881 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
5882 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5883 | } else if (mddev->recovery_cp < MaxSector) { | |
5884 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
5885 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5886 | /* nothing to be done ... */ | |
1da177e4 | 5887 | goto unlock; |
24dd469d | 5888 | |
1da177e4 LT |
5889 | if (mddev->pers->sync_request) { |
5890 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
5891 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
5892 | /* We are adding a device or devices to an array | |
5893 | * which has the bitmap stored on all devices. | |
5894 | * So make sure all bitmap pages get written | |
5895 | */ | |
5896 | bitmap_write_all(mddev->bitmap); | |
5897 | } | |
1da177e4 LT |
5898 | mddev->sync_thread = md_register_thread(md_do_sync, |
5899 | mddev, | |
5900 | "%s_resync"); | |
5901 | if (!mddev->sync_thread) { | |
5902 | printk(KERN_ERR "%s: could not start resync" | |
5903 | " thread...\n", | |
5904 | mdname(mddev)); | |
5905 | /* leave the spares where they are, it shouldn't hurt */ | |
5906 | mddev->recovery = 0; | |
d7603b7e | 5907 | } else |
1da177e4 | 5908 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 5909 | md_new_event(mddev); |
1da177e4 LT |
5910 | } |
5911 | unlock: | |
5912 | mddev_unlock(mddev); | |
5913 | } | |
5914 | } | |
5915 | ||
75c96f85 AB |
5916 | static int md_notify_reboot(struct notifier_block *this, |
5917 | unsigned long code, void *x) | |
1da177e4 LT |
5918 | { |
5919 | struct list_head *tmp; | |
5920 | mddev_t *mddev; | |
5921 | ||
5922 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
5923 | ||
5924 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
5925 | ||
29ac4aa3 | 5926 | for_each_mddev(mddev, tmp) |
c71d4887 | 5927 | if (mddev_trylock(mddev)) { |
1da177e4 | 5928 | do_md_stop (mddev, 1); |
c71d4887 NB |
5929 | mddev_unlock(mddev); |
5930 | } | |
1da177e4 LT |
5931 | /* |
5932 | * certain more exotic SCSI devices are known to be | |
5933 | * volatile wrt too early system reboots. While the | |
5934 | * right place to handle this issue is the given | |
5935 | * driver, we do want to have a safe RAID driver ... | |
5936 | */ | |
5937 | mdelay(1000*1); | |
5938 | } | |
5939 | return NOTIFY_DONE; | |
5940 | } | |
5941 | ||
75c96f85 | 5942 | static struct notifier_block md_notifier = { |
1da177e4 LT |
5943 | .notifier_call = md_notify_reboot, |
5944 | .next = NULL, | |
5945 | .priority = INT_MAX, /* before any real devices */ | |
5946 | }; | |
5947 | ||
5948 | static void md_geninit(void) | |
5949 | { | |
5950 | struct proc_dir_entry *p; | |
5951 | ||
5952 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
5953 | ||
5954 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
5955 | if (p) | |
5956 | p->proc_fops = &md_seq_fops; | |
5957 | } | |
5958 | ||
75c96f85 | 5959 | static int __init md_init(void) |
1da177e4 | 5960 | { |
1da177e4 LT |
5961 | if (register_blkdev(MAJOR_NR, "md")) |
5962 | return -1; | |
5963 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
5964 | unregister_blkdev(MAJOR_NR, "md"); | |
5965 | return -1; | |
5966 | } | |
e8703fe1 N |
5967 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
5968 | md_probe, NULL, NULL); | |
5969 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
5970 | md_probe, NULL, NULL); |
5971 | ||
1da177e4 | 5972 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 5973 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
5974 | |
5975 | md_geninit(); | |
5976 | return (0); | |
5977 | } | |
5978 | ||
5979 | ||
5980 | #ifndef MODULE | |
5981 | ||
5982 | /* | |
5983 | * Searches all registered partitions for autorun RAID arrays | |
5984 | * at boot time. | |
5985 | */ | |
4d936ec1 ME |
5986 | |
5987 | static LIST_HEAD(all_detected_devices); | |
5988 | struct detected_devices_node { | |
5989 | struct list_head list; | |
5990 | dev_t dev; | |
5991 | }; | |
1da177e4 LT |
5992 | |
5993 | void md_autodetect_dev(dev_t dev) | |
5994 | { | |
4d936ec1 ME |
5995 | struct detected_devices_node *node_detected_dev; |
5996 | ||
5997 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
5998 | if (node_detected_dev) { | |
5999 | node_detected_dev->dev = dev; | |
6000 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6001 | } else { | |
6002 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6003 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6004 | } | |
1da177e4 LT |
6005 | } |
6006 | ||
6007 | ||
6008 | static void autostart_arrays(int part) | |
6009 | { | |
6010 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6011 | struct detected_devices_node *node_detected_dev; |
6012 | dev_t dev; | |
6013 | int i_scanned, i_passed; | |
1da177e4 | 6014 | |
4d936ec1 ME |
6015 | i_scanned = 0; |
6016 | i_passed = 0; | |
1da177e4 | 6017 | |
4d936ec1 | 6018 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6019 | |
4d936ec1 ME |
6020 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6021 | i_scanned++; | |
6022 | node_detected_dev = list_entry(all_detected_devices.next, | |
6023 | struct detected_devices_node, list); | |
6024 | list_del(&node_detected_dev->list); | |
6025 | dev = node_detected_dev->dev; | |
6026 | kfree(node_detected_dev); | |
df968c4e | 6027 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6028 | if (IS_ERR(rdev)) |
6029 | continue; | |
6030 | ||
b2d444d7 | 6031 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6032 | MD_BUG(); |
6033 | continue; | |
6034 | } | |
d0fae18f | 6035 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6036 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6037 | i_passed++; |
1da177e4 | 6038 | } |
4d936ec1 ME |
6039 | |
6040 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6041 | i_scanned, i_passed); | |
1da177e4 LT |
6042 | |
6043 | autorun_devices(part); | |
6044 | } | |
6045 | ||
fdee8ae4 | 6046 | #endif /* !MODULE */ |
1da177e4 LT |
6047 | |
6048 | static __exit void md_exit(void) | |
6049 | { | |
6050 | mddev_t *mddev; | |
6051 | struct list_head *tmp; | |
8ab5e4c1 | 6052 | |
e8703fe1 N |
6053 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
6054 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
6055 | |
6056 | unregister_blkdev(MAJOR_NR,"md"); | |
6057 | unregister_blkdev(mdp_major, "mdp"); | |
6058 | unregister_reboot_notifier(&md_notifier); | |
6059 | unregister_sysctl_table(raid_table_header); | |
6060 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6061 | for_each_mddev(mddev, tmp) { |
1da177e4 LT |
6062 | struct gendisk *disk = mddev->gendisk; |
6063 | if (!disk) | |
6064 | continue; | |
6065 | export_array(mddev); | |
6066 | del_gendisk(disk); | |
6067 | put_disk(disk); | |
6068 | mddev->gendisk = NULL; | |
6069 | mddev_put(mddev); | |
6070 | } | |
6071 | } | |
6072 | ||
685784aa | 6073 | subsys_initcall(md_init); |
1da177e4 LT |
6074 | module_exit(md_exit) |
6075 | ||
f91de92e N |
6076 | static int get_ro(char *buffer, struct kernel_param *kp) |
6077 | { | |
6078 | return sprintf(buffer, "%d", start_readonly); | |
6079 | } | |
6080 | static int set_ro(const char *val, struct kernel_param *kp) | |
6081 | { | |
6082 | char *e; | |
6083 | int num = simple_strtoul(val, &e, 10); | |
6084 | if (*val && (*e == '\0' || *e == '\n')) { | |
6085 | start_readonly = num; | |
4dbcdc75 | 6086 | return 0; |
f91de92e N |
6087 | } |
6088 | return -EINVAL; | |
6089 | } | |
6090 | ||
80ca3a44 N |
6091 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6092 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6093 | |
f91de92e | 6094 | |
1da177e4 LT |
6095 | EXPORT_SYMBOL(register_md_personality); |
6096 | EXPORT_SYMBOL(unregister_md_personality); | |
6097 | EXPORT_SYMBOL(md_error); | |
6098 | EXPORT_SYMBOL(md_done_sync); | |
6099 | EXPORT_SYMBOL(md_write_start); | |
6100 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6101 | EXPORT_SYMBOL(md_register_thread); |
6102 | EXPORT_SYMBOL(md_unregister_thread); | |
6103 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6104 | EXPORT_SYMBOL(md_check_recovery); |
6105 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6106 | MODULE_ALIAS("md"); |
72008652 | 6107 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |