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Commit | Line | Data |
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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 | ||
90b08710 BS |
77 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
78 | ||
5e56341d AB |
79 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
80 | ||
1da177e4 LT |
81 | /* |
82 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
83 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
84 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 85 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
86 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
87 | * speed limit - in case reconstruction slows down your system despite | |
88 | * idle IO detection. | |
89 | * | |
90 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 91 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
92 | */ |
93 | ||
94 | static int sysctl_speed_limit_min = 1000; | |
95 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
96 | static inline int speed_min(mddev_t *mddev) |
97 | { | |
98 | return mddev->sync_speed_min ? | |
99 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
100 | } | |
101 | ||
102 | static inline int speed_max(mddev_t *mddev) | |
103 | { | |
104 | return mddev->sync_speed_max ? | |
105 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
106 | } | |
1da177e4 LT |
107 | |
108 | static struct ctl_table_header *raid_table_header; | |
109 | ||
110 | static ctl_table raid_table[] = { | |
111 | { | |
112 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
113 | .procname = "speed_limit_min", | |
114 | .data = &sysctl_speed_limit_min, | |
115 | .maxlen = sizeof(int), | |
80ca3a44 | 116 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
117 | .proc_handler = &proc_dointvec, |
118 | }, | |
119 | { | |
120 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
121 | .procname = "speed_limit_max", | |
122 | .data = &sysctl_speed_limit_max, | |
123 | .maxlen = sizeof(int), | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
125 | .proc_handler = &proc_dointvec, |
126 | }, | |
127 | { .ctl_name = 0 } | |
128 | }; | |
129 | ||
130 | static ctl_table raid_dir_table[] = { | |
131 | { | |
132 | .ctl_name = DEV_RAID, | |
133 | .procname = "raid", | |
134 | .maxlen = 0, | |
80ca3a44 | 135 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
136 | .child = raid_table, |
137 | }, | |
138 | { .ctl_name = 0 } | |
139 | }; | |
140 | ||
141 | static ctl_table raid_root_table[] = { | |
142 | { | |
143 | .ctl_name = CTL_DEV, | |
144 | .procname = "dev", | |
145 | .maxlen = 0, | |
146 | .mode = 0555, | |
147 | .child = raid_dir_table, | |
148 | }, | |
149 | { .ctl_name = 0 } | |
150 | }; | |
151 | ||
152 | static struct block_device_operations md_fops; | |
153 | ||
f91de92e N |
154 | static int start_readonly; |
155 | ||
d7603b7e N |
156 | /* |
157 | * We have a system wide 'event count' that is incremented | |
158 | * on any 'interesting' event, and readers of /proc/mdstat | |
159 | * can use 'poll' or 'select' to find out when the event | |
160 | * count increases. | |
161 | * | |
162 | * Events are: | |
163 | * start array, stop array, error, add device, remove device, | |
164 | * start build, activate spare | |
165 | */ | |
2989ddbd | 166 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 167 | static atomic_t md_event_count; |
29269553 | 168 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
169 | { |
170 | atomic_inc(&md_event_count); | |
171 | wake_up(&md_event_waiters); | |
172 | } | |
29269553 | 173 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 174 | |
c331eb04 N |
175 | /* Alternate version that can be called from interrupts |
176 | * when calling sysfs_notify isn't needed. | |
177 | */ | |
05381954 | 178 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
179 | { |
180 | atomic_inc(&md_event_count); | |
181 | wake_up(&md_event_waiters); | |
182 | } | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * Enables to iterate over all existing md arrays | |
186 | * all_mddevs_lock protects this list. | |
187 | */ | |
188 | static LIST_HEAD(all_mddevs); | |
189 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
190 | ||
191 | ||
192 | /* | |
193 | * iterates through all used mddevs in the system. | |
194 | * We take care to grab the all_mddevs_lock whenever navigating | |
195 | * the list, and to always hold a refcount when unlocked. | |
196 | * Any code which breaks out of this loop while own | |
197 | * a reference to the current mddev and must mddev_put it. | |
198 | */ | |
29ac4aa3 | 199 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
200 | \ |
201 | for (({ spin_lock(&all_mddevs_lock); \ | |
202 | tmp = all_mddevs.next; \ | |
203 | mddev = NULL;}); \ | |
204 | ({ if (tmp != &all_mddevs) \ | |
205 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
206 | spin_unlock(&all_mddevs_lock); \ | |
207 | if (mddev) mddev_put(mddev); \ | |
208 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
209 | tmp != &all_mddevs;}); \ | |
210 | ({ spin_lock(&all_mddevs_lock); \ | |
211 | tmp = tmp->next;}) \ | |
212 | ) | |
213 | ||
214 | ||
165125e1 | 215 | static int md_fail_request (struct request_queue *q, struct bio *bio) |
1da177e4 | 216 | { |
6712ecf8 | 217 | bio_io_error(bio); |
1da177e4 LT |
218 | return 0; |
219 | } | |
220 | ||
221 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
222 | { | |
223 | atomic_inc(&mddev->active); | |
224 | return mddev; | |
225 | } | |
226 | ||
227 | static void mddev_put(mddev_t *mddev) | |
228 | { | |
229 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
230 | return; | |
231 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
232 | list_del(&mddev->all_mddevs); | |
926ce2d8 | 233 | spin_unlock(&all_mddevs_lock); |
1312f40e | 234 | blk_cleanup_queue(mddev->queue); |
c10997f6 | 235 | kobject_put(&mddev->kobj); |
926ce2d8 N |
236 | } else |
237 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
238 | } |
239 | ||
240 | static mddev_t * mddev_find(dev_t unit) | |
241 | { | |
242 | mddev_t *mddev, *new = NULL; | |
243 | ||
244 | retry: | |
245 | spin_lock(&all_mddevs_lock); | |
246 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
247 | if (mddev->unit == unit) { | |
248 | mddev_get(mddev); | |
249 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 250 | kfree(new); |
1da177e4 LT |
251 | return mddev; |
252 | } | |
253 | ||
254 | if (new) { | |
255 | list_add(&new->all_mddevs, &all_mddevs); | |
256 | spin_unlock(&all_mddevs_lock); | |
257 | return new; | |
258 | } | |
259 | spin_unlock(&all_mddevs_lock); | |
260 | ||
9ffae0cf | 261 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
262 | if (!new) |
263 | return NULL; | |
264 | ||
1da177e4 LT |
265 | new->unit = unit; |
266 | if (MAJOR(unit) == MD_MAJOR) | |
267 | new->md_minor = MINOR(unit); | |
268 | else | |
269 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
270 | ||
df5b89b3 | 271 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
272 | INIT_LIST_HEAD(&new->disks); |
273 | INIT_LIST_HEAD(&new->all_mddevs); | |
274 | init_timer(&new->safemode_timer); | |
275 | atomic_set(&new->active, 1); | |
06d91a5f | 276 | spin_lock_init(&new->write_lock); |
3d310eb7 | 277 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 278 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 279 | new->reshape_position = MaxSector; |
5e96ee65 | 280 | new->resync_min = 0; |
c6207277 | 281 | new->resync_max = MaxSector; |
d897dbf9 | 282 | new->level = LEVEL_NONE; |
1da177e4 LT |
283 | |
284 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
285 | if (!new->queue) { | |
286 | kfree(new); | |
287 | return NULL; | |
288 | } | |
75ad23bc NP |
289 | /* Can be unlocked because the queue is new: no concurrency */ |
290 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue); | |
1da177e4 LT |
291 | |
292 | blk_queue_make_request(new->queue, md_fail_request); | |
293 | ||
294 | goto retry; | |
295 | } | |
296 | ||
297 | static inline int mddev_lock(mddev_t * mddev) | |
298 | { | |
df5b89b3 | 299 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
300 | } |
301 | ||
1da177e4 LT |
302 | static inline int mddev_trylock(mddev_t * mddev) |
303 | { | |
df5b89b3 | 304 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
305 | } |
306 | ||
307 | static inline void mddev_unlock(mddev_t * mddev) | |
308 | { | |
df5b89b3 | 309 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 310 | |
005eca5e | 311 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
312 | } |
313 | ||
2989ddbd | 314 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 LT |
315 | { |
316 | mdk_rdev_t * rdev; | |
317 | struct list_head *tmp; | |
318 | ||
d089c6af | 319 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
320 | if (rdev->desc_nr == nr) |
321 | return rdev; | |
322 | } | |
323 | return NULL; | |
324 | } | |
325 | ||
326 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
327 | { | |
328 | struct list_head *tmp; | |
329 | mdk_rdev_t *rdev; | |
330 | ||
d089c6af | 331 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
332 | if (rdev->bdev->bd_dev == dev) |
333 | return rdev; | |
334 | } | |
335 | return NULL; | |
336 | } | |
337 | ||
d9d166c2 | 338 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
339 | { |
340 | struct mdk_personality *pers; | |
d9d166c2 N |
341 | list_for_each_entry(pers, &pers_list, list) { |
342 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 343 | return pers; |
d9d166c2 N |
344 | if (strcmp(pers->name, clevel)==0) |
345 | return pers; | |
346 | } | |
2604b703 N |
347 | return NULL; |
348 | } | |
349 | ||
b73df2d3 | 350 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 351 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 352 | { |
b73df2d3 AN |
353 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
354 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
355 | } |
356 | ||
e7debaa4 | 357 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 358 | { |
0f420358 | 359 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
360 | |
361 | if (chunk_size) | |
e7debaa4 AN |
362 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
363 | return num_sectors; | |
1da177e4 LT |
364 | } |
365 | ||
366 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
367 | { | |
368 | if (rdev->sb_page) | |
369 | MD_BUG(); | |
370 | ||
371 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
372 | if (!rdev->sb_page) { | |
373 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 374 | return -ENOMEM; |
1da177e4 LT |
375 | } |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static void free_disk_sb(mdk_rdev_t * rdev) | |
381 | { | |
382 | if (rdev->sb_page) { | |
2d1f3b5d | 383 | put_page(rdev->sb_page); |
1da177e4 LT |
384 | rdev->sb_loaded = 0; |
385 | rdev->sb_page = NULL; | |
0f420358 | 386 | rdev->sb_start = 0; |
1da177e4 LT |
387 | rdev->size = 0; |
388 | } | |
389 | } | |
390 | ||
391 | ||
6712ecf8 | 392 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
393 | { |
394 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 395 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 396 | |
3a0f5bbb N |
397 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
398 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
399 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
400 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 401 | md_error(mddev, rdev); |
3a0f5bbb | 402 | } |
7bfa19f2 | 403 | |
a9701a30 N |
404 | if (atomic_dec_and_test(&mddev->pending_writes)) |
405 | wake_up(&mddev->sb_wait); | |
f8b58edf | 406 | bio_put(bio); |
7bfa19f2 N |
407 | } |
408 | ||
6712ecf8 | 409 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
410 | { |
411 | struct bio *bio2 = bio->bi_private; | |
412 | mdk_rdev_t *rdev = bio2->bi_private; | |
413 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
414 | |
415 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
416 | error == -EOPNOTSUPP) { | |
417 | unsigned long flags; | |
418 | /* barriers don't appear to be supported :-( */ | |
419 | set_bit(BarriersNotsupp, &rdev->flags); | |
420 | mddev->barriers_work = 0; | |
421 | spin_lock_irqsave(&mddev->write_lock, flags); | |
422 | bio2->bi_next = mddev->biolist; | |
423 | mddev->biolist = bio2; | |
424 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
425 | wake_up(&mddev->sb_wait); | |
426 | bio_put(bio); | |
6712ecf8 N |
427 | } else { |
428 | bio_put(bio2); | |
429 | bio->bi_private = rdev; | |
430 | super_written(bio, error); | |
a9701a30 | 431 | } |
a9701a30 N |
432 | } |
433 | ||
7bfa19f2 N |
434 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
435 | sector_t sector, int size, struct page *page) | |
436 | { | |
437 | /* write first size bytes of page to sector of rdev | |
438 | * Increment mddev->pending_writes before returning | |
439 | * and decrement it on completion, waking up sb_wait | |
440 | * if zero is reached. | |
441 | * If an error occurred, call md_error | |
a9701a30 N |
442 | * |
443 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
444 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
445 | */ |
446 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 447 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
448 | |
449 | bio->bi_bdev = rdev->bdev; | |
450 | bio->bi_sector = sector; | |
451 | bio_add_page(bio, page, size, 0); | |
452 | bio->bi_private = rdev; | |
453 | bio->bi_end_io = super_written; | |
a9701a30 N |
454 | bio->bi_rw = rw; |
455 | ||
7bfa19f2 | 456 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
457 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
458 | struct bio *rbio; | |
459 | rw |= (1<<BIO_RW_BARRIER); | |
460 | rbio = bio_clone(bio, GFP_NOIO); | |
461 | rbio->bi_private = bio; | |
462 | rbio->bi_end_io = super_written_barrier; | |
463 | submit_bio(rw, rbio); | |
464 | } else | |
465 | submit_bio(rw, bio); | |
466 | } | |
467 | ||
468 | void md_super_wait(mddev_t *mddev) | |
469 | { | |
470 | /* wait for all superblock writes that were scheduled to complete. | |
471 | * if any had to be retried (due to BARRIER problems), retry them | |
472 | */ | |
473 | DEFINE_WAIT(wq); | |
474 | for(;;) { | |
475 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
476 | if (atomic_read(&mddev->pending_writes)==0) | |
477 | break; | |
478 | while (mddev->biolist) { | |
479 | struct bio *bio; | |
480 | spin_lock_irq(&mddev->write_lock); | |
481 | bio = mddev->biolist; | |
482 | mddev->biolist = bio->bi_next ; | |
483 | bio->bi_next = NULL; | |
484 | spin_unlock_irq(&mddev->write_lock); | |
485 | submit_bio(bio->bi_rw, bio); | |
486 | } | |
487 | schedule(); | |
488 | } | |
489 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
490 | } |
491 | ||
6712ecf8 | 492 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 493 | { |
1da177e4 | 494 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
495 | } |
496 | ||
a654b9d8 | 497 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
498 | struct page *page, int rw) |
499 | { | |
baaa2c51 | 500 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
501 | struct completion event; |
502 | int ret; | |
503 | ||
504 | rw |= (1 << BIO_RW_SYNC); | |
505 | ||
506 | bio->bi_bdev = bdev; | |
507 | bio->bi_sector = sector; | |
508 | bio_add_page(bio, page, size, 0); | |
509 | init_completion(&event); | |
510 | bio->bi_private = &event; | |
511 | bio->bi_end_io = bi_complete; | |
512 | submit_bio(rw, bio); | |
513 | wait_for_completion(&event); | |
514 | ||
515 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
516 | bio_put(bio); | |
517 | return ret; | |
518 | } | |
a8745db2 | 519 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 520 | |
0002b271 | 521 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
522 | { |
523 | char b[BDEVNAME_SIZE]; | |
524 | if (!rdev->sb_page) { | |
525 | MD_BUG(); | |
526 | return -EINVAL; | |
527 | } | |
528 | if (rdev->sb_loaded) | |
529 | return 0; | |
530 | ||
531 | ||
0f420358 | 532 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
533 | goto fail; |
534 | rdev->sb_loaded = 1; | |
535 | return 0; | |
536 | ||
537 | fail: | |
538 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
539 | bdevname(rdev->bdev,b)); | |
540 | return -EINVAL; | |
541 | } | |
542 | ||
543 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
544 | { | |
05710466 AN |
545 | return sb1->set_uuid0 == sb2->set_uuid0 && |
546 | sb1->set_uuid1 == sb2->set_uuid1 && | |
547 | sb1->set_uuid2 == sb2->set_uuid2 && | |
548 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
549 | } |
550 | ||
1da177e4 LT |
551 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
552 | { | |
553 | int ret; | |
554 | mdp_super_t *tmp1, *tmp2; | |
555 | ||
556 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
557 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
558 | ||
559 | if (!tmp1 || !tmp2) { | |
560 | ret = 0; | |
35020f1a | 561 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
562 | goto abort; |
563 | } | |
564 | ||
565 | *tmp1 = *sb1; | |
566 | *tmp2 = *sb2; | |
567 | ||
568 | /* | |
569 | * nr_disks is not constant | |
570 | */ | |
571 | tmp1->nr_disks = 0; | |
572 | tmp2->nr_disks = 0; | |
573 | ||
ce0c8e05 | 574 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 575 | abort: |
990a8baf JJ |
576 | kfree(tmp1); |
577 | kfree(tmp2); | |
1da177e4 LT |
578 | return ret; |
579 | } | |
580 | ||
4d167f09 N |
581 | |
582 | static u32 md_csum_fold(u32 csum) | |
583 | { | |
584 | csum = (csum & 0xffff) + (csum >> 16); | |
585 | return (csum & 0xffff) + (csum >> 16); | |
586 | } | |
587 | ||
1da177e4 LT |
588 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
589 | { | |
4d167f09 N |
590 | u64 newcsum = 0; |
591 | u32 *sb32 = (u32*)sb; | |
592 | int i; | |
1da177e4 LT |
593 | unsigned int disk_csum, csum; |
594 | ||
595 | disk_csum = sb->sb_csum; | |
596 | sb->sb_csum = 0; | |
4d167f09 N |
597 | |
598 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
599 | newcsum += sb32[i]; | |
600 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
601 | ||
602 | ||
603 | #ifdef CONFIG_ALPHA | |
604 | /* This used to use csum_partial, which was wrong for several | |
605 | * reasons including that different results are returned on | |
606 | * different architectures. It isn't critical that we get exactly | |
607 | * the same return value as before (we always csum_fold before | |
608 | * testing, and that removes any differences). However as we | |
609 | * know that csum_partial always returned a 16bit value on | |
610 | * alphas, do a fold to maximise conformity to previous behaviour. | |
611 | */ | |
612 | sb->sb_csum = md_csum_fold(disk_csum); | |
613 | #else | |
1da177e4 | 614 | sb->sb_csum = disk_csum; |
4d167f09 | 615 | #endif |
1da177e4 LT |
616 | return csum; |
617 | } | |
618 | ||
619 | ||
620 | /* | |
621 | * Handle superblock details. | |
622 | * We want to be able to handle multiple superblock formats | |
623 | * so we have a common interface to them all, and an array of | |
624 | * different handlers. | |
625 | * We rely on user-space to write the initial superblock, and support | |
626 | * reading and updating of superblocks. | |
627 | * Interface methods are: | |
628 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
629 | * loads and validates a superblock on dev. | |
630 | * if refdev != NULL, compare superblocks on both devices | |
631 | * Return: | |
632 | * 0 - dev has a superblock that is compatible with refdev | |
633 | * 1 - dev has a superblock that is compatible and newer than refdev | |
634 | * so dev should be used as the refdev in future | |
635 | * -EINVAL superblock incompatible or invalid | |
636 | * -othererror e.g. -EIO | |
637 | * | |
638 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
639 | * Verify that dev is acceptable into mddev. | |
640 | * The first time, mddev->raid_disks will be 0, and data from | |
641 | * dev should be merged in. Subsequent calls check that dev | |
642 | * is new enough. Return 0 or -EINVAL | |
643 | * | |
644 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
645 | * Update the superblock for rdev with data in mddev | |
646 | * This does not write to disc. | |
647 | * | |
648 | */ | |
649 | ||
650 | struct super_type { | |
0cd17fec CW |
651 | char *name; |
652 | struct module *owner; | |
653 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
654 | int minor_version); | |
655 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
656 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
657 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
658 | unsigned long long size); | |
1da177e4 LT |
659 | }; |
660 | ||
661 | /* | |
662 | * load_super for 0.90.0 | |
663 | */ | |
664 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
665 | { | |
666 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
667 | mdp_super_t *sb; | |
668 | int ret; | |
1da177e4 LT |
669 | |
670 | /* | |
0f420358 | 671 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
672 | * it's at the end of the disk. |
673 | * | |
674 | * It also happens to be a multiple of 4Kb. | |
675 | */ | |
0f420358 | 676 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 677 | |
0002b271 | 678 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
679 | if (ret) return ret; |
680 | ||
681 | ret = -EINVAL; | |
682 | ||
683 | bdevname(rdev->bdev, b); | |
684 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
685 | ||
686 | if (sb->md_magic != MD_SB_MAGIC) { | |
687 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
688 | b); | |
689 | goto abort; | |
690 | } | |
691 | ||
692 | if (sb->major_version != 0 || | |
f6705578 N |
693 | sb->minor_version < 90 || |
694 | sb->minor_version > 91) { | |
1da177e4 LT |
695 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
696 | sb->major_version, sb->minor_version, | |
697 | b); | |
698 | goto abort; | |
699 | } | |
700 | ||
701 | if (sb->raid_disks <= 0) | |
702 | goto abort; | |
703 | ||
4d167f09 | 704 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
705 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
706 | b); | |
707 | goto abort; | |
708 | } | |
709 | ||
710 | rdev->preferred_minor = sb->md_minor; | |
711 | rdev->data_offset = 0; | |
0002b271 | 712 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 713 | |
e11e93fa N |
714 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
715 | if (sb->level != 1 && sb->level != 4 | |
716 | && sb->level != 5 && sb->level != 6 | |
717 | && sb->level != 10) { | |
718 | /* FIXME use a better test */ | |
719 | printk(KERN_WARNING | |
720 | "md: bitmaps not supported for this level.\n"); | |
721 | goto abort; | |
722 | } | |
723 | } | |
724 | ||
1da177e4 LT |
725 | if (sb->level == LEVEL_MULTIPATH) |
726 | rdev->desc_nr = -1; | |
727 | else | |
728 | rdev->desc_nr = sb->this_disk.number; | |
729 | ||
9a7b2b0f | 730 | if (!refdev) { |
1da177e4 | 731 | ret = 1; |
9a7b2b0f | 732 | } else { |
1da177e4 LT |
733 | __u64 ev1, ev2; |
734 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
735 | if (!uuid_equal(refsb, sb)) { | |
736 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
737 | b, bdevname(refdev->bdev,b2)); | |
738 | goto abort; | |
739 | } | |
740 | if (!sb_equal(refsb, sb)) { | |
741 | printk(KERN_WARNING "md: %s has same UUID" | |
742 | " but different superblock to %s\n", | |
743 | b, bdevname(refdev->bdev, b2)); | |
744 | goto abort; | |
745 | } | |
746 | ev1 = md_event(sb); | |
747 | ev2 = md_event(refsb); | |
748 | if (ev1 > ev2) | |
749 | ret = 1; | |
750 | else | |
751 | ret = 0; | |
752 | } | |
e7debaa4 | 753 | rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2; |
1da177e4 | 754 | |
2bf071bf N |
755 | if (rdev->size < sb->size && sb->level > 1) |
756 | /* "this cannot possibly happen" ... */ | |
757 | ret = -EINVAL; | |
758 | ||
1da177e4 LT |
759 | abort: |
760 | return ret; | |
761 | } | |
762 | ||
763 | /* | |
764 | * validate_super for 0.90.0 | |
765 | */ | |
766 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
767 | { | |
768 | mdp_disk_t *desc; | |
769 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 770 | __u64 ev1 = md_event(sb); |
1da177e4 | 771 | |
41158c7e | 772 | rdev->raid_disk = -1; |
c5d79adb N |
773 | clear_bit(Faulty, &rdev->flags); |
774 | clear_bit(In_sync, &rdev->flags); | |
775 | clear_bit(WriteMostly, &rdev->flags); | |
776 | clear_bit(BarriersNotsupp, &rdev->flags); | |
777 | ||
1da177e4 LT |
778 | if (mddev->raid_disks == 0) { |
779 | mddev->major_version = 0; | |
780 | mddev->minor_version = sb->minor_version; | |
781 | mddev->patch_version = sb->patch_version; | |
e691063a | 782 | mddev->external = 0; |
1da177e4 LT |
783 | mddev->chunk_size = sb->chunk_size; |
784 | mddev->ctime = sb->ctime; | |
785 | mddev->utime = sb->utime; | |
786 | mddev->level = sb->level; | |
d9d166c2 | 787 | mddev->clevel[0] = 0; |
1da177e4 LT |
788 | mddev->layout = sb->layout; |
789 | mddev->raid_disks = sb->raid_disks; | |
790 | mddev->size = sb->size; | |
07d84d10 | 791 | mddev->events = ev1; |
9223214e | 792 | mddev->bitmap_offset = 0; |
36fa3063 | 793 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 794 | |
f6705578 N |
795 | if (mddev->minor_version >= 91) { |
796 | mddev->reshape_position = sb->reshape_position; | |
797 | mddev->delta_disks = sb->delta_disks; | |
798 | mddev->new_level = sb->new_level; | |
799 | mddev->new_layout = sb->new_layout; | |
800 | mddev->new_chunk = sb->new_chunk; | |
801 | } else { | |
802 | mddev->reshape_position = MaxSector; | |
803 | mddev->delta_disks = 0; | |
804 | mddev->new_level = mddev->level; | |
805 | mddev->new_layout = mddev->layout; | |
806 | mddev->new_chunk = mddev->chunk_size; | |
807 | } | |
808 | ||
1da177e4 LT |
809 | if (sb->state & (1<<MD_SB_CLEAN)) |
810 | mddev->recovery_cp = MaxSector; | |
811 | else { | |
812 | if (sb->events_hi == sb->cp_events_hi && | |
813 | sb->events_lo == sb->cp_events_lo) { | |
814 | mddev->recovery_cp = sb->recovery_cp; | |
815 | } else | |
816 | mddev->recovery_cp = 0; | |
817 | } | |
818 | ||
819 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
820 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
821 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
822 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
823 | ||
824 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
825 | |
826 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 827 | mddev->bitmap_file == NULL) |
36fa3063 | 828 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 829 | |
41158c7e N |
830 | } else if (mddev->pers == NULL) { |
831 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
832 | ++ev1; |
833 | if (ev1 < mddev->events) | |
834 | return -EINVAL; | |
41158c7e N |
835 | } else if (mddev->bitmap) { |
836 | /* if adding to array with a bitmap, then we can accept an | |
837 | * older device ... but not too old. | |
838 | */ | |
41158c7e N |
839 | if (ev1 < mddev->bitmap->events_cleared) |
840 | return 0; | |
07d84d10 N |
841 | } else { |
842 | if (ev1 < mddev->events) | |
843 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
844 | return 0; | |
845 | } | |
41158c7e | 846 | |
1da177e4 | 847 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
848 | desc = sb->disks + rdev->desc_nr; |
849 | ||
850 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 851 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
852 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
853 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 854 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
855 | rdev->raid_disk = desc->raid_disk; |
856 | } | |
8ddf9efe N |
857 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
858 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 859 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 860 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
861 | return 0; |
862 | } | |
863 | ||
864 | /* | |
865 | * sync_super for 0.90.0 | |
866 | */ | |
867 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
868 | { | |
869 | mdp_super_t *sb; | |
870 | struct list_head *tmp; | |
871 | mdk_rdev_t *rdev2; | |
872 | int next_spare = mddev->raid_disks; | |
19133a42 | 873 | |
1da177e4 LT |
874 | |
875 | /* make rdev->sb match mddev data.. | |
876 | * | |
877 | * 1/ zero out disks | |
878 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
879 | * 3/ any empty disks < next_spare become removed | |
880 | * | |
881 | * disks[0] gets initialised to REMOVED because | |
882 | * we cannot be sure from other fields if it has | |
883 | * been initialised or not. | |
884 | */ | |
885 | int i; | |
886 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
887 | ||
61181565 N |
888 | rdev->sb_size = MD_SB_BYTES; |
889 | ||
1da177e4 LT |
890 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
891 | ||
892 | memset(sb, 0, sizeof(*sb)); | |
893 | ||
894 | sb->md_magic = MD_SB_MAGIC; | |
895 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
896 | sb->patch_version = mddev->patch_version; |
897 | sb->gvalid_words = 0; /* ignored */ | |
898 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
899 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
900 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
901 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
902 | ||
903 | sb->ctime = mddev->ctime; | |
904 | sb->level = mddev->level; | |
905 | sb->size = mddev->size; | |
906 | sb->raid_disks = mddev->raid_disks; | |
907 | sb->md_minor = mddev->md_minor; | |
e691063a | 908 | sb->not_persistent = 0; |
1da177e4 LT |
909 | sb->utime = mddev->utime; |
910 | sb->state = 0; | |
911 | sb->events_hi = (mddev->events>>32); | |
912 | sb->events_lo = (u32)mddev->events; | |
913 | ||
f6705578 N |
914 | if (mddev->reshape_position == MaxSector) |
915 | sb->minor_version = 90; | |
916 | else { | |
917 | sb->minor_version = 91; | |
918 | sb->reshape_position = mddev->reshape_position; | |
919 | sb->new_level = mddev->new_level; | |
920 | sb->delta_disks = mddev->delta_disks; | |
921 | sb->new_layout = mddev->new_layout; | |
922 | sb->new_chunk = mddev->new_chunk; | |
923 | } | |
924 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
925 | if (mddev->in_sync) |
926 | { | |
927 | sb->recovery_cp = mddev->recovery_cp; | |
928 | sb->cp_events_hi = (mddev->events>>32); | |
929 | sb->cp_events_lo = (u32)mddev->events; | |
930 | if (mddev->recovery_cp == MaxSector) | |
931 | sb->state = (1<< MD_SB_CLEAN); | |
932 | } else | |
933 | sb->recovery_cp = 0; | |
934 | ||
935 | sb->layout = mddev->layout; | |
936 | sb->chunk_size = mddev->chunk_size; | |
937 | ||
a654b9d8 N |
938 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
939 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
940 | ||
1da177e4 | 941 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
d089c6af | 942 | rdev_for_each(rdev2, tmp, mddev) { |
1da177e4 | 943 | mdp_disk_t *d; |
86e6ffdd | 944 | int desc_nr; |
b2d444d7 N |
945 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
946 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 947 | desc_nr = rdev2->raid_disk; |
1da177e4 | 948 | else |
86e6ffdd | 949 | desc_nr = next_spare++; |
19133a42 | 950 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
951 | d = &sb->disks[rdev2->desc_nr]; |
952 | nr_disks++; | |
953 | d->number = rdev2->desc_nr; | |
954 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
955 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
956 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
957 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
958 | d->raid_disk = rdev2->raid_disk; |
959 | else | |
960 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 961 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 962 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 963 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
964 | d->state = (1<<MD_DISK_ACTIVE); |
965 | d->state |= (1<<MD_DISK_SYNC); | |
966 | active++; | |
967 | working++; | |
968 | } else { | |
969 | d->state = 0; | |
970 | spare++; | |
971 | working++; | |
972 | } | |
8ddf9efe N |
973 | if (test_bit(WriteMostly, &rdev2->flags)) |
974 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 975 | } |
1da177e4 LT |
976 | /* now set the "removed" and "faulty" bits on any missing devices */ |
977 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
978 | mdp_disk_t *d = &sb->disks[i]; | |
979 | if (d->state == 0 && d->number == 0) { | |
980 | d->number = i; | |
981 | d->raid_disk = i; | |
982 | d->state = (1<<MD_DISK_REMOVED); | |
983 | d->state |= (1<<MD_DISK_FAULTY); | |
984 | failed++; | |
985 | } | |
986 | } | |
987 | sb->nr_disks = nr_disks; | |
988 | sb->active_disks = active; | |
989 | sb->working_disks = working; | |
990 | sb->failed_disks = failed; | |
991 | sb->spare_disks = spare; | |
992 | ||
993 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
994 | sb->sb_csum = calc_sb_csum(sb); | |
995 | } | |
996 | ||
0cd17fec CW |
997 | /* |
998 | * rdev_size_change for 0.90.0 | |
999 | */ | |
1000 | static unsigned long long | |
1001 | super_90_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size) | |
1002 | { | |
1003 | if (size && size < rdev->mddev->size) | |
1004 | return 0; /* component must fit device */ | |
1005 | size *= 2; /* convert to sectors */ | |
1006 | if (rdev->mddev->bitmap_offset) | |
1007 | return 0; /* can't move bitmap */ | |
0f420358 AN |
1008 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1009 | if (!size || size > rdev->sb_start) | |
1010 | size = rdev->sb_start; | |
1011 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, | |
0cd17fec CW |
1012 | rdev->sb_page); |
1013 | md_super_wait(rdev->mddev); | |
1014 | return size/2; /* kB for sysfs */ | |
1015 | } | |
1016 | ||
1017 | ||
1da177e4 LT |
1018 | /* |
1019 | * version 1 superblock | |
1020 | */ | |
1021 | ||
1c05b4bc | 1022 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1023 | { |
1c05b4bc N |
1024 | __le32 disk_csum; |
1025 | u32 csum; | |
1da177e4 LT |
1026 | unsigned long long newcsum; |
1027 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1028 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1029 | int i; |
1030 | ||
1031 | disk_csum = sb->sb_csum; | |
1032 | sb->sb_csum = 0; | |
1033 | newcsum = 0; | |
1034 | for (i=0; size>=4; size -= 4 ) | |
1035 | newcsum += le32_to_cpu(*isuper++); | |
1036 | ||
1037 | if (size == 2) | |
1c05b4bc | 1038 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1039 | |
1040 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1041 | sb->sb_csum = disk_csum; | |
1042 | return cpu_to_le32(csum); | |
1043 | } | |
1044 | ||
1045 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1046 | { | |
1047 | struct mdp_superblock_1 *sb; | |
1048 | int ret; | |
0f420358 | 1049 | sector_t sb_start; |
1da177e4 | 1050 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1051 | int bmask; |
1da177e4 LT |
1052 | |
1053 | /* | |
0f420358 | 1054 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1055 | * It is always aligned to a 4K boundary and |
1056 | * depeding on minor_version, it can be: | |
1057 | * 0: At least 8K, but less than 12K, from end of device | |
1058 | * 1: At start of device | |
1059 | * 2: 4K from start of device. | |
1060 | */ | |
1061 | switch(minor_version) { | |
1062 | case 0: | |
0f420358 AN |
1063 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1064 | sb_start -= 8*2; | |
1065 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1066 | break; |
1067 | case 1: | |
0f420358 | 1068 | sb_start = 0; |
1da177e4 LT |
1069 | break; |
1070 | case 2: | |
0f420358 | 1071 | sb_start = 8; |
1da177e4 LT |
1072 | break; |
1073 | default: | |
1074 | return -EINVAL; | |
1075 | } | |
0f420358 | 1076 | rdev->sb_start = sb_start; |
1da177e4 | 1077 | |
0002b271 N |
1078 | /* superblock is rarely larger than 1K, but it can be larger, |
1079 | * and it is safe to read 4k, so we do that | |
1080 | */ | |
1081 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1082 | if (ret) return ret; |
1083 | ||
1084 | ||
1085 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1086 | ||
1087 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1088 | sb->major_version != cpu_to_le32(1) || | |
1089 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1090 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1091 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1092 | return -EINVAL; |
1093 | ||
1094 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1095 | printk("md: invalid superblock checksum on %s\n", | |
1096 | bdevname(rdev->bdev,b)); | |
1097 | return -EINVAL; | |
1098 | } | |
1099 | if (le64_to_cpu(sb->data_size) < 10) { | |
1100 | printk("md: data_size too small on %s\n", | |
1101 | bdevname(rdev->bdev,b)); | |
1102 | return -EINVAL; | |
1103 | } | |
e11e93fa N |
1104 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1105 | if (sb->level != cpu_to_le32(1) && | |
1106 | sb->level != cpu_to_le32(4) && | |
1107 | sb->level != cpu_to_le32(5) && | |
1108 | sb->level != cpu_to_le32(6) && | |
1109 | sb->level != cpu_to_le32(10)) { | |
1110 | printk(KERN_WARNING | |
1111 | "md: bitmaps not supported for this level.\n"); | |
1112 | return -EINVAL; | |
1113 | } | |
1114 | } | |
1115 | ||
1da177e4 LT |
1116 | rdev->preferred_minor = 0xffff; |
1117 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1118 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1119 | |
0002b271 | 1120 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1121 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1122 | if (rdev->sb_size & bmask) |
a1801f85 N |
1123 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1124 | ||
1125 | if (minor_version | |
0f420358 | 1126 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1127 | return -EINVAL; |
0002b271 | 1128 | |
31b65a0d N |
1129 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1130 | rdev->desc_nr = -1; | |
1131 | else | |
1132 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1133 | ||
9a7b2b0f | 1134 | if (!refdev) { |
8ed75463 | 1135 | ret = 1; |
9a7b2b0f | 1136 | } else { |
1da177e4 LT |
1137 | __u64 ev1, ev2; |
1138 | struct mdp_superblock_1 *refsb = | |
1139 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1140 | ||
1141 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1142 | sb->level != refsb->level || | |
1143 | sb->layout != refsb->layout || | |
1144 | sb->chunksize != refsb->chunksize) { | |
1145 | printk(KERN_WARNING "md: %s has strangely different" | |
1146 | " superblock to %s\n", | |
1147 | bdevname(rdev->bdev,b), | |
1148 | bdevname(refdev->bdev,b2)); | |
1149 | return -EINVAL; | |
1150 | } | |
1151 | ev1 = le64_to_cpu(sb->events); | |
1152 | ev2 = le64_to_cpu(refsb->events); | |
1153 | ||
1154 | if (ev1 > ev2) | |
8ed75463 N |
1155 | ret = 1; |
1156 | else | |
1157 | ret = 0; | |
1da177e4 | 1158 | } |
a1801f85 | 1159 | if (minor_version) |
1da177e4 LT |
1160 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; |
1161 | else | |
0f420358 | 1162 | rdev->size = rdev->sb_start / 2; |
1da177e4 LT |
1163 | if (rdev->size < le64_to_cpu(sb->data_size)/2) |
1164 | return -EINVAL; | |
1165 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1166 | if (le32_to_cpu(sb->chunksize)) | |
1167 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1168 | |
1c05b4bc | 1169 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1170 | return -EINVAL; |
8ed75463 | 1171 | return ret; |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1175 | { | |
1176 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1177 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1178 | |
41158c7e | 1179 | rdev->raid_disk = -1; |
c5d79adb N |
1180 | clear_bit(Faulty, &rdev->flags); |
1181 | clear_bit(In_sync, &rdev->flags); | |
1182 | clear_bit(WriteMostly, &rdev->flags); | |
1183 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1184 | ||
1da177e4 LT |
1185 | if (mddev->raid_disks == 0) { |
1186 | mddev->major_version = 1; | |
1187 | mddev->patch_version = 0; | |
e691063a | 1188 | mddev->external = 0; |
1da177e4 LT |
1189 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1190 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1191 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1192 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1193 | mddev->clevel[0] = 0; |
1da177e4 LT |
1194 | mddev->layout = le32_to_cpu(sb->layout); |
1195 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1196 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1197 | mddev->events = ev1; |
9223214e | 1198 | mddev->bitmap_offset = 0; |
29fc7e3e | 1199 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1200 | |
1201 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1202 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1203 | ||
1204 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1205 | |
71c0805c | 1206 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1207 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1208 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1209 | |
f6705578 N |
1210 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1211 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1212 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1213 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1214 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1215 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1216 | } else { | |
1217 | mddev->reshape_position = MaxSector; | |
1218 | mddev->delta_disks = 0; | |
1219 | mddev->new_level = mddev->level; | |
1220 | mddev->new_layout = mddev->layout; | |
1221 | mddev->new_chunk = mddev->chunk_size; | |
1222 | } | |
1223 | ||
41158c7e N |
1224 | } else if (mddev->pers == NULL) { |
1225 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1226 | ++ev1; |
1227 | if (ev1 < mddev->events) | |
1228 | return -EINVAL; | |
41158c7e N |
1229 | } else if (mddev->bitmap) { |
1230 | /* If adding to array with a bitmap, then we can accept an | |
1231 | * older device, but not too old. | |
1232 | */ | |
41158c7e N |
1233 | if (ev1 < mddev->bitmap->events_cleared) |
1234 | return 0; | |
07d84d10 N |
1235 | } else { |
1236 | if (ev1 < mddev->events) | |
1237 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1238 | return 0; | |
1239 | } | |
1da177e4 LT |
1240 | if (mddev->level != LEVEL_MULTIPATH) { |
1241 | int role; | |
1da177e4 LT |
1242 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1243 | switch(role) { | |
1244 | case 0xffff: /* spare */ | |
1da177e4 LT |
1245 | break; |
1246 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1247 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1248 | break; |
1249 | default: | |
5fd6c1dc N |
1250 | if ((le32_to_cpu(sb->feature_map) & |
1251 | MD_FEATURE_RECOVERY_OFFSET)) | |
1252 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1253 | else | |
1254 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1255 | rdev->raid_disk = role; |
1256 | break; | |
1257 | } | |
8ddf9efe N |
1258 | if (sb->devflags & WriteMostly1) |
1259 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1260 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1261 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1262 | |
1da177e4 LT |
1263 | return 0; |
1264 | } | |
1265 | ||
1266 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1267 | { | |
1268 | struct mdp_superblock_1 *sb; | |
1269 | struct list_head *tmp; | |
1270 | mdk_rdev_t *rdev2; | |
1271 | int max_dev, i; | |
1272 | /* make rdev->sb match mddev and rdev data. */ | |
1273 | ||
1274 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1275 | ||
1276 | sb->feature_map = 0; | |
1277 | sb->pad0 = 0; | |
5fd6c1dc | 1278 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1279 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1280 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1281 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1282 | ||
1283 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1284 | sb->events = cpu_to_le64(mddev->events); | |
1285 | if (mddev->in_sync) | |
1286 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1287 | else | |
1288 | sb->resync_offset = cpu_to_le64(0); | |
1289 | ||
1c05b4bc | 1290 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1291 | |
f0ca340c | 1292 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1293 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1294 | |
a654b9d8 N |
1295 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1296 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1297 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1298 | } |
5fd6c1dc N |
1299 | |
1300 | if (rdev->raid_disk >= 0 && | |
1301 | !test_bit(In_sync, &rdev->flags) && | |
1302 | rdev->recovery_offset > 0) { | |
1303 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1304 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1305 | } | |
1306 | ||
f6705578 N |
1307 | if (mddev->reshape_position != MaxSector) { |
1308 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1309 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1310 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1311 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1312 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1313 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1314 | } | |
a654b9d8 | 1315 | |
1da177e4 | 1316 | max_dev = 0; |
d089c6af | 1317 | rdev_for_each(rdev2, tmp, mddev) |
1da177e4 LT |
1318 | if (rdev2->desc_nr+1 > max_dev) |
1319 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1320 | |
1321 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1322 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1323 | for (i=0; i<max_dev;i++) |
1324 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1325 | ||
d089c6af | 1326 | rdev_for_each(rdev2, tmp, mddev) { |
1da177e4 | 1327 | i = rdev2->desc_nr; |
b2d444d7 | 1328 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1329 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1330 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1331 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1332 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1333 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1334 | else |
1335 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1336 | } | |
1337 | ||
1da177e4 LT |
1338 | sb->sb_csum = calc_sb_1_csum(sb); |
1339 | } | |
1340 | ||
0cd17fec CW |
1341 | static unsigned long long |
1342 | super_1_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size) | |
1343 | { | |
1344 | struct mdp_superblock_1 *sb; | |
1345 | unsigned long long max_size; | |
1346 | if (size && size < rdev->mddev->size) | |
1347 | return 0; /* component must fit device */ | |
1348 | size *= 2; /* convert to sectors */ | |
0f420358 | 1349 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec CW |
1350 | /* minor versions 1 and 2; superblock before data */ |
1351 | max_size = (rdev->bdev->bd_inode->i_size >> 9); | |
1352 | max_size -= rdev->data_offset; | |
1353 | if (!size || size > max_size) | |
1354 | size = max_size; | |
1355 | } else if (rdev->mddev->bitmap_offset) { | |
1356 | /* minor version 0 with bitmap we can't move */ | |
1357 | return 0; | |
1358 | } else { | |
1359 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1360 | sector_t sb_start; |
1361 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1362 | sb_start &= ~(sector_t)(4*2 - 1); | |
1363 | max_size = rdev->size*2 + sb_start - rdev->sb_start; | |
0cd17fec CW |
1364 | if (!size || size > max_size) |
1365 | size = max_size; | |
0f420358 | 1366 | rdev->sb_start = sb_start; |
0cd17fec CW |
1367 | } |
1368 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
1369 | sb->data_size = cpu_to_le64(size); | |
0f420358 | 1370 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1371 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1372 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1373 | rdev->sb_page); |
1374 | md_super_wait(rdev->mddev); | |
1375 | return size/2; /* kB for sysfs */ | |
1376 | } | |
1da177e4 | 1377 | |
75c96f85 | 1378 | static struct super_type super_types[] = { |
1da177e4 LT |
1379 | [0] = { |
1380 | .name = "0.90.0", | |
1381 | .owner = THIS_MODULE, | |
0cd17fec CW |
1382 | .load_super = super_90_load, |
1383 | .validate_super = super_90_validate, | |
1384 | .sync_super = super_90_sync, | |
1385 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1386 | }, |
1387 | [1] = { | |
1388 | .name = "md-1", | |
1389 | .owner = THIS_MODULE, | |
0cd17fec CW |
1390 | .load_super = super_1_load, |
1391 | .validate_super = super_1_validate, | |
1392 | .sync_super = super_1_sync, | |
1393 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1394 | }, |
1395 | }; | |
1da177e4 LT |
1396 | |
1397 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1398 | { | |
7dd5e7c3 N |
1399 | struct list_head *tmp, *tmp2; |
1400 | mdk_rdev_t *rdev, *rdev2; | |
1da177e4 | 1401 | |
d089c6af N |
1402 | rdev_for_each(rdev, tmp, mddev1) |
1403 | rdev_for_each(rdev2, tmp2, mddev2) | |
7dd5e7c3 N |
1404 | if (rdev->bdev->bd_contains == |
1405 | rdev2->bdev->bd_contains) | |
1406 | return 1; | |
1da177e4 LT |
1407 | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | static LIST_HEAD(pending_raid_disks); | |
1412 | ||
1413 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1414 | { | |
7dd5e7c3 | 1415 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1416 | struct kobject *ko; |
1edf80d3 | 1417 | char *s; |
5e55e2f5 | 1418 | int err; |
1da177e4 LT |
1419 | |
1420 | if (rdev->mddev) { | |
1421 | MD_BUG(); | |
1422 | return -EINVAL; | |
1423 | } | |
11e2ede0 DW |
1424 | |
1425 | /* prevent duplicates */ | |
1426 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1427 | return -EEXIST; | |
1428 | ||
2bf071bf N |
1429 | /* make sure rdev->size exceeds mddev->size */ |
1430 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1431 | if (mddev->pers) { |
1432 | /* Cannot change size, so fail | |
1433 | * If mddev->level <= 0, then we don't care | |
1434 | * about aligning sizes (e.g. linear) | |
1435 | */ | |
1436 | if (mddev->level > 0) | |
1437 | return -ENOSPC; | |
1438 | } else | |
2bf071bf N |
1439 | mddev->size = rdev->size; |
1440 | } | |
1da177e4 LT |
1441 | |
1442 | /* Verify rdev->desc_nr is unique. | |
1443 | * If it is -1, assign a free number, else | |
1444 | * check number is not in use | |
1445 | */ | |
1446 | if (rdev->desc_nr < 0) { | |
1447 | int choice = 0; | |
1448 | if (mddev->pers) choice = mddev->raid_disks; | |
1449 | while (find_rdev_nr(mddev, choice)) | |
1450 | choice++; | |
1451 | rdev->desc_nr = choice; | |
1452 | } else { | |
1453 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1454 | return -EBUSY; | |
1455 | } | |
19133a42 | 1456 | bdevname(rdev->bdev,b); |
649316b2 | 1457 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1458 | *s = '!'; |
649316b2 | 1459 | |
1da177e4 | 1460 | rdev->mddev = mddev; |
19133a42 | 1461 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1462 | |
b2d6db58 | 1463 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1464 | goto fail; |
86e6ffdd | 1465 | |
f637b9f9 | 1466 | if (rdev->bdev->bd_part) |
edfaa7c3 | 1467 | ko = &rdev->bdev->bd_part->dev.kobj; |
f637b9f9 | 1468 | else |
edfaa7c3 | 1469 | ko = &rdev->bdev->bd_disk->dev.kobj; |
5e55e2f5 N |
1470 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1471 | kobject_del(&rdev->kobj); | |
1472 | goto fail; | |
1473 | } | |
1474 | list_add(&rdev->same_set, &mddev->disks); | |
c5d79adb | 1475 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
1da177e4 | 1476 | return 0; |
5e55e2f5 N |
1477 | |
1478 | fail: | |
1479 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1480 | b, mdname(mddev)); | |
1481 | return err; | |
1da177e4 LT |
1482 | } |
1483 | ||
177a99b2 | 1484 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1485 | { |
1486 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1487 | kobject_del(&rdev->kobj); | |
177a99b2 | 1488 | kobject_put(&rdev->kobj); |
5792a285 N |
1489 | } |
1490 | ||
1da177e4 LT |
1491 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1492 | { | |
1493 | char b[BDEVNAME_SIZE]; | |
1494 | if (!rdev->mddev) { | |
1495 | MD_BUG(); | |
1496 | return; | |
1497 | } | |
5463c790 | 1498 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
1da177e4 LT |
1499 | list_del_init(&rdev->same_set); |
1500 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1501 | rdev->mddev = NULL; | |
86e6ffdd | 1502 | sysfs_remove_link(&rdev->kobj, "block"); |
5792a285 N |
1503 | |
1504 | /* We need to delay this, otherwise we can deadlock when | |
1505 | * writing to 'remove' to "dev/state" | |
1506 | */ | |
177a99b2 N |
1507 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1508 | kobject_get(&rdev->kobj); | |
5792a285 | 1509 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1510 | } |
1511 | ||
1512 | /* | |
1513 | * prevent the device from being mounted, repartitioned or | |
1514 | * otherwise reused by a RAID array (or any other kernel | |
1515 | * subsystem), by bd_claiming the device. | |
1516 | */ | |
c5d79adb | 1517 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1518 | { |
1519 | int err = 0; | |
1520 | struct block_device *bdev; | |
1521 | char b[BDEVNAME_SIZE]; | |
1522 | ||
2e7b651d | 1523 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1524 | if (IS_ERR(bdev)) { |
1525 | printk(KERN_ERR "md: could not open %s.\n", | |
1526 | __bdevname(dev, b)); | |
1527 | return PTR_ERR(bdev); | |
1528 | } | |
c5d79adb | 1529 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1530 | if (err) { |
1531 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1532 | bdevname(bdev, b)); | |
2e7b651d | 1533 | blkdev_put(bdev); |
1da177e4 LT |
1534 | return err; |
1535 | } | |
c5d79adb N |
1536 | if (!shared) |
1537 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1538 | rdev->bdev = bdev; |
1539 | return err; | |
1540 | } | |
1541 | ||
1542 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1543 | { | |
1544 | struct block_device *bdev = rdev->bdev; | |
1545 | rdev->bdev = NULL; | |
1546 | if (!bdev) | |
1547 | MD_BUG(); | |
1548 | bd_release(bdev); | |
2e7b651d | 1549 | blkdev_put(bdev); |
1da177e4 LT |
1550 | } |
1551 | ||
1552 | void md_autodetect_dev(dev_t dev); | |
1553 | ||
1554 | static void export_rdev(mdk_rdev_t * rdev) | |
1555 | { | |
1556 | char b[BDEVNAME_SIZE]; | |
1557 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1558 | bdevname(rdev->bdev,b)); | |
1559 | if (rdev->mddev) | |
1560 | MD_BUG(); | |
1561 | free_disk_sb(rdev); | |
1562 | list_del_init(&rdev->same_set); | |
1563 | #ifndef MODULE | |
d0fae18f N |
1564 | if (test_bit(AutoDetected, &rdev->flags)) |
1565 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1566 | #endif |
1567 | unlock_rdev(rdev); | |
86e6ffdd | 1568 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1572 | { | |
1573 | unbind_rdev_from_array(rdev); | |
1574 | export_rdev(rdev); | |
1575 | } | |
1576 | ||
1577 | static void export_array(mddev_t *mddev) | |
1578 | { | |
1579 | struct list_head *tmp; | |
1580 | mdk_rdev_t *rdev; | |
1581 | ||
d089c6af | 1582 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1583 | if (!rdev->mddev) { |
1584 | MD_BUG(); | |
1585 | continue; | |
1586 | } | |
1587 | kick_rdev_from_array(rdev); | |
1588 | } | |
1589 | if (!list_empty(&mddev->disks)) | |
1590 | MD_BUG(); | |
1591 | mddev->raid_disks = 0; | |
1592 | mddev->major_version = 0; | |
1593 | } | |
1594 | ||
1595 | static void print_desc(mdp_disk_t *desc) | |
1596 | { | |
1597 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1598 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1599 | } | |
1600 | ||
1601 | static void print_sb(mdp_super_t *sb) | |
1602 | { | |
1603 | int i; | |
1604 | ||
1605 | printk(KERN_INFO | |
1606 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1607 | sb->major_version, sb->minor_version, sb->patch_version, | |
1608 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1609 | sb->ctime); | |
1610 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1611 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1612 | sb->md_minor, sb->layout, sb->chunk_size); | |
1613 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1614 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1615 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1616 | sb->failed_disks, sb->spare_disks, | |
1617 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1618 | ||
1619 | printk(KERN_INFO); | |
1620 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1621 | mdp_disk_t *desc; | |
1622 | ||
1623 | desc = sb->disks + i; | |
1624 | if (desc->number || desc->major || desc->minor || | |
1625 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1626 | printk(" D %2d: ", i); | |
1627 | print_desc(desc); | |
1628 | } | |
1629 | } | |
1630 | printk(KERN_INFO "md: THIS: "); | |
1631 | print_desc(&sb->this_disk); | |
1632 | ||
1633 | } | |
1634 | ||
1635 | static void print_rdev(mdk_rdev_t *rdev) | |
1636 | { | |
1637 | char b[BDEVNAME_SIZE]; | |
1638 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1639 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1640 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1641 | rdev->desc_nr); | |
1da177e4 LT |
1642 | if (rdev->sb_loaded) { |
1643 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1644 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1645 | } else | |
1646 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1647 | } | |
1648 | ||
5e56341d | 1649 | static void md_print_devices(void) |
1da177e4 LT |
1650 | { |
1651 | struct list_head *tmp, *tmp2; | |
1652 | mdk_rdev_t *rdev; | |
1653 | mddev_t *mddev; | |
1654 | char b[BDEVNAME_SIZE]; | |
1655 | ||
1656 | printk("\n"); | |
1657 | printk("md: **********************************\n"); | |
1658 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1659 | printk("md: **********************************\n"); | |
29ac4aa3 | 1660 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1661 | |
32a7627c N |
1662 | if (mddev->bitmap) |
1663 | bitmap_print_sb(mddev->bitmap); | |
1664 | else | |
1665 | printk("%s: ", mdname(mddev)); | |
d089c6af | 1666 | rdev_for_each(rdev, tmp2, mddev) |
1da177e4 LT |
1667 | printk("<%s>", bdevname(rdev->bdev,b)); |
1668 | printk("\n"); | |
1669 | ||
d089c6af | 1670 | rdev_for_each(rdev, tmp2, mddev) |
1da177e4 LT |
1671 | print_rdev(rdev); |
1672 | } | |
1673 | printk("md: **********************************\n"); | |
1674 | printk("\n"); | |
1675 | } | |
1676 | ||
1677 | ||
42543769 | 1678 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1679 | { |
42543769 N |
1680 | /* Update each superblock (in-memory image), but |
1681 | * if we are allowed to, skip spares which already | |
1682 | * have the right event counter, or have one earlier | |
1683 | * (which would mean they aren't being marked as dirty | |
1684 | * with the rest of the array) | |
1685 | */ | |
1da177e4 LT |
1686 | mdk_rdev_t *rdev; |
1687 | struct list_head *tmp; | |
1688 | ||
d089c6af | 1689 | rdev_for_each(rdev, tmp, mddev) { |
42543769 N |
1690 | if (rdev->sb_events == mddev->events || |
1691 | (nospares && | |
1692 | rdev->raid_disk < 0 && | |
1693 | (rdev->sb_events&1)==0 && | |
1694 | rdev->sb_events+1 == mddev->events)) { | |
1695 | /* Don't update this superblock */ | |
1696 | rdev->sb_loaded = 2; | |
1697 | } else { | |
1698 | super_types[mddev->major_version]. | |
1699 | sync_super(mddev, rdev); | |
1700 | rdev->sb_loaded = 1; | |
1701 | } | |
1da177e4 LT |
1702 | } |
1703 | } | |
1704 | ||
850b2b42 | 1705 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1706 | { |
1da177e4 LT |
1707 | struct list_head *tmp; |
1708 | mdk_rdev_t *rdev; | |
06d91a5f | 1709 | int sync_req; |
42543769 | 1710 | int nospares = 0; |
1da177e4 | 1711 | |
8377bc80 N |
1712 | if (mddev->external) |
1713 | return; | |
1da177e4 | 1714 | repeat: |
a9701a30 | 1715 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1716 | |
850b2b42 N |
1717 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1718 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1719 | force_change = 1; | |
1720 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1721 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1722 | * though if events isn't the right even/odd, we will have to do | |
1723 | * spares after all | |
1724 | */ | |
1725 | nospares = 1; | |
1726 | if (force_change) | |
1727 | nospares = 0; | |
1728 | if (mddev->degraded) | |
84692195 N |
1729 | /* If the array is degraded, then skipping spares is both |
1730 | * dangerous and fairly pointless. | |
1731 | * Dangerous because a device that was removed from the array | |
1732 | * might have a event_count that still looks up-to-date, | |
1733 | * so it can be re-added without a resync. | |
1734 | * Pointless because if there are any spares to skip, | |
1735 | * then a recovery will happen and soon that array won't | |
1736 | * be degraded any more and the spare can go back to sleep then. | |
1737 | */ | |
850b2b42 | 1738 | nospares = 0; |
84692195 | 1739 | |
06d91a5f | 1740 | sync_req = mddev->in_sync; |
1da177e4 | 1741 | mddev->utime = get_seconds(); |
42543769 N |
1742 | |
1743 | /* If this is just a dirty<->clean transition, and the array is clean | |
1744 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1745 | if (nospares |
42543769 | 1746 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1747 | && (mddev->events & 1) |
1748 | && mddev->events != 1) | |
42543769 N |
1749 | mddev->events--; |
1750 | else { | |
1751 | /* otherwise we have to go forward and ... */ | |
1752 | mddev->events ++; | |
1753 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1754 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1755 | if ((mddev->events&1)==0) { | |
1756 | mddev->events++; | |
1757 | nospares = 0; | |
1758 | } | |
1759 | } else { | |
1760 | /* otherwise insist on an even 'events' (for clean states) */ | |
1761 | if ((mddev->events&1)) { | |
1762 | mddev->events++; | |
1763 | nospares = 0; | |
1764 | } | |
1765 | } | |
1766 | } | |
1da177e4 LT |
1767 | |
1768 | if (!mddev->events) { | |
1769 | /* | |
1770 | * oops, this 64-bit counter should never wrap. | |
1771 | * Either we are in around ~1 trillion A.C., assuming | |
1772 | * 1 reboot per second, or we have a bug: | |
1773 | */ | |
1774 | MD_BUG(); | |
1775 | mddev->events --; | |
1776 | } | |
1da177e4 LT |
1777 | |
1778 | /* | |
1779 | * do not write anything to disk if using | |
1780 | * nonpersistent superblocks | |
1781 | */ | |
06d91a5f | 1782 | if (!mddev->persistent) { |
e691063a N |
1783 | if (!mddev->external) |
1784 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1785 | ||
a9701a30 | 1786 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1787 | wake_up(&mddev->sb_wait); |
1da177e4 | 1788 | return; |
06d91a5f | 1789 | } |
e691063a | 1790 | sync_sbs(mddev, nospares); |
a9701a30 | 1791 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1792 | |
1793 | dprintk(KERN_INFO | |
1794 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1795 | mdname(mddev),mddev->in_sync); | |
1796 | ||
4ad13663 | 1797 | bitmap_update_sb(mddev->bitmap); |
d089c6af | 1798 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1799 | char b[BDEVNAME_SIZE]; |
1800 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1801 | if (rdev->sb_loaded != 1) |
1802 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1803 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1804 | dprintk("(skipping faulty "); |
1805 | ||
1806 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1807 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1808 | md_super_write(mddev,rdev, |
0f420358 | 1809 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
1810 | rdev->sb_page); |
1811 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1812 | bdevname(rdev->bdev,b), | |
0f420358 | 1813 | (unsigned long long)rdev->sb_start); |
42543769 | 1814 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1815 | |
1da177e4 LT |
1816 | } else |
1817 | dprintk(")\n"); | |
7bfa19f2 | 1818 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1819 | /* only need to write one superblock... */ |
1820 | break; | |
1821 | } | |
a9701a30 | 1822 | md_super_wait(mddev); |
850b2b42 | 1823 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1824 | |
a9701a30 | 1825 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1826 | if (mddev->in_sync != sync_req || |
1827 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1828 | /* have to write it out again */ |
a9701a30 | 1829 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1830 | goto repeat; |
1831 | } | |
850b2b42 | 1832 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1833 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1834 | wake_up(&mddev->sb_wait); |
06d91a5f | 1835 | |
1da177e4 LT |
1836 | } |
1837 | ||
7f6ce769 | 1838 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
1839 | * We want to accept with case. For this we use cmd_match. |
1840 | */ | |
1841 | static int cmd_match(const char *cmd, const char *str) | |
1842 | { | |
1843 | /* See if cmd, written into a sysfs file, matches | |
1844 | * str. They must either be the same, or cmd can | |
1845 | * have a trailing newline | |
1846 | */ | |
1847 | while (*cmd && *str && *cmd == *str) { | |
1848 | cmd++; | |
1849 | str++; | |
1850 | } | |
1851 | if (*cmd == '\n') | |
1852 | cmd++; | |
1853 | if (*str || *cmd) | |
1854 | return 0; | |
1855 | return 1; | |
1856 | } | |
1857 | ||
86e6ffdd N |
1858 | struct rdev_sysfs_entry { |
1859 | struct attribute attr; | |
1860 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1861 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1862 | }; | |
1863 | ||
1864 | static ssize_t | |
96de1e66 | 1865 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1866 | { |
1867 | char *sep = ""; | |
20a49ff6 | 1868 | size_t len = 0; |
86e6ffdd | 1869 | |
b2d444d7 | 1870 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1871 | len+= sprintf(page+len, "%sfaulty",sep); |
1872 | sep = ","; | |
1873 | } | |
b2d444d7 | 1874 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1875 | len += sprintf(page+len, "%sin_sync",sep); |
1876 | sep = ","; | |
1877 | } | |
f655675b N |
1878 | if (test_bit(WriteMostly, &rdev->flags)) { |
1879 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1880 | sep = ","; | |
1881 | } | |
6bfe0b49 DW |
1882 | if (test_bit(Blocked, &rdev->flags)) { |
1883 | len += sprintf(page+len, "%sblocked", sep); | |
1884 | sep = ","; | |
1885 | } | |
b2d444d7 N |
1886 | if (!test_bit(Faulty, &rdev->flags) && |
1887 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1888 | len += sprintf(page+len, "%sspare", sep); |
1889 | sep = ","; | |
1890 | } | |
1891 | return len+sprintf(page+len, "\n"); | |
1892 | } | |
1893 | ||
45dc2de1 N |
1894 | static ssize_t |
1895 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1896 | { | |
1897 | /* can write | |
1898 | * faulty - simulates and error | |
1899 | * remove - disconnects the device | |
f655675b N |
1900 | * writemostly - sets write_mostly |
1901 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
1902 | * blocked - sets the Blocked flag |
1903 | * -blocked - clears the Blocked flag | |
45dc2de1 N |
1904 | */ |
1905 | int err = -EINVAL; | |
1906 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1907 | md_error(rdev->mddev, rdev); | |
1908 | err = 0; | |
1909 | } else if (cmd_match(buf, "remove")) { | |
1910 | if (rdev->raid_disk >= 0) | |
1911 | err = -EBUSY; | |
1912 | else { | |
1913 | mddev_t *mddev = rdev->mddev; | |
1914 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1915 | if (mddev->pers) |
1916 | md_update_sb(mddev, 1); | |
45dc2de1 N |
1917 | md_new_event(mddev); |
1918 | err = 0; | |
1919 | } | |
f655675b N |
1920 | } else if (cmd_match(buf, "writemostly")) { |
1921 | set_bit(WriteMostly, &rdev->flags); | |
1922 | err = 0; | |
1923 | } else if (cmd_match(buf, "-writemostly")) { | |
1924 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
1925 | err = 0; |
1926 | } else if (cmd_match(buf, "blocked")) { | |
1927 | set_bit(Blocked, &rdev->flags); | |
1928 | err = 0; | |
1929 | } else if (cmd_match(buf, "-blocked")) { | |
1930 | clear_bit(Blocked, &rdev->flags); | |
1931 | wake_up(&rdev->blocked_wait); | |
1932 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
1933 | md_wakeup_thread(rdev->mddev->thread); | |
1934 | ||
f655675b | 1935 | err = 0; |
45dc2de1 | 1936 | } |
52664732 NB |
1937 | if (!err) |
1938 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
45dc2de1 N |
1939 | return err ? err : len; |
1940 | } | |
80ca3a44 N |
1941 | static struct rdev_sysfs_entry rdev_state = |
1942 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 1943 | |
4dbcdc75 N |
1944 | static ssize_t |
1945 | errors_show(mdk_rdev_t *rdev, char *page) | |
1946 | { | |
1947 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1948 | } | |
1949 | ||
1950 | static ssize_t | |
1951 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1952 | { | |
1953 | char *e; | |
1954 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1955 | if (*buf && (*e == 0 || *e == '\n')) { | |
1956 | atomic_set(&rdev->corrected_errors, n); | |
1957 | return len; | |
1958 | } | |
1959 | return -EINVAL; | |
1960 | } | |
1961 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 1962 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 1963 | |
014236d2 N |
1964 | static ssize_t |
1965 | slot_show(mdk_rdev_t *rdev, char *page) | |
1966 | { | |
1967 | if (rdev->raid_disk < 0) | |
1968 | return sprintf(page, "none\n"); | |
1969 | else | |
1970 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1971 | } | |
1972 | ||
1973 | static ssize_t | |
1974 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1975 | { | |
1976 | char *e; | |
c303da6d N |
1977 | int err; |
1978 | char nm[20]; | |
014236d2 N |
1979 | int slot = simple_strtoul(buf, &e, 10); |
1980 | if (strncmp(buf, "none", 4)==0) | |
1981 | slot = -1; | |
1982 | else if (e==buf || (*e && *e!= '\n')) | |
1983 | return -EINVAL; | |
6c2fce2e | 1984 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
1985 | /* Setting 'slot' on an active array requires also |
1986 | * updating the 'rd%d' link, and communicating | |
1987 | * with the personality with ->hot_*_disk. | |
1988 | * For now we only support removing | |
1989 | * failed/spare devices. This normally happens automatically, | |
1990 | * but not when the metadata is externally managed. | |
1991 | */ | |
c303da6d N |
1992 | if (rdev->raid_disk == -1) |
1993 | return -EEXIST; | |
1994 | /* personality does all needed checks */ | |
1995 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
1996 | return -EINVAL; | |
1997 | err = rdev->mddev->pers-> | |
1998 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
1999 | if (err) | |
2000 | return err; | |
2001 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2002 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2003 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2004 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2005 | } else if (rdev->mddev->pers) { |
2006 | mdk_rdev_t *rdev2; | |
2007 | struct list_head *tmp; | |
2008 | /* Activating a spare .. or possibly reactivating | |
2009 | * if we every get bitmaps working here. | |
2010 | */ | |
2011 | ||
2012 | if (rdev->raid_disk != -1) | |
2013 | return -EBUSY; | |
2014 | ||
2015 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2016 | return -EINVAL; | |
2017 | ||
2018 | rdev_for_each(rdev2, tmp, rdev->mddev) | |
2019 | if (rdev2->raid_disk == slot) | |
2020 | return -EEXIST; | |
2021 | ||
2022 | rdev->raid_disk = slot; | |
2023 | if (test_bit(In_sync, &rdev->flags)) | |
2024 | rdev->saved_raid_disk = slot; | |
2025 | else | |
2026 | rdev->saved_raid_disk = -1; | |
2027 | err = rdev->mddev->pers-> | |
2028 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2029 | if (err) { |
6c2fce2e | 2030 | rdev->raid_disk = -1; |
6c2fce2e | 2031 | return err; |
52664732 NB |
2032 | } else |
2033 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
6c2fce2e NB |
2034 | sprintf(nm, "rd%d", rdev->raid_disk); |
2035 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2036 | printk(KERN_WARNING | |
2037 | "md: cannot register " | |
2038 | "%s for %s\n", | |
2039 | nm, mdname(rdev->mddev)); | |
2040 | ||
2041 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2042 | } else { |
2043 | if (slot >= rdev->mddev->raid_disks) | |
2044 | return -ENOSPC; | |
2045 | rdev->raid_disk = slot; | |
2046 | /* assume it is working */ | |
c5d79adb N |
2047 | clear_bit(Faulty, &rdev->flags); |
2048 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2049 | set_bit(In_sync, &rdev->flags); |
52664732 | 2050 | sysfs_notify(&rdev->kobj, NULL, "state"); |
c303da6d | 2051 | } |
014236d2 N |
2052 | return len; |
2053 | } | |
2054 | ||
2055 | ||
2056 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2057 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2058 | |
93c8cad0 N |
2059 | static ssize_t |
2060 | offset_show(mdk_rdev_t *rdev, char *page) | |
2061 | { | |
6961ece4 | 2062 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2063 | } |
2064 | ||
2065 | static ssize_t | |
2066 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2067 | { | |
2068 | char *e; | |
2069 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2070 | if (e==buf || (*e && *e != '\n')) | |
2071 | return -EINVAL; | |
8ed0a521 | 2072 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2073 | return -EBUSY; |
c5d79adb N |
2074 | if (rdev->size && rdev->mddev->external) |
2075 | /* Must set offset before size, so overlap checks | |
2076 | * can be sane */ | |
2077 | return -EBUSY; | |
93c8cad0 N |
2078 | rdev->data_offset = offset; |
2079 | return len; | |
2080 | } | |
2081 | ||
2082 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2083 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2084 | |
83303b61 N |
2085 | static ssize_t |
2086 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2087 | { | |
2088 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
2089 | } | |
2090 | ||
c5d79adb N |
2091 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2092 | { | |
2093 | /* check if two start/length pairs overlap */ | |
2094 | if (s1+l1 <= s2) | |
2095 | return 0; | |
2096 | if (s2+l2 <= s1) | |
2097 | return 0; | |
2098 | return 1; | |
2099 | } | |
2100 | ||
83303b61 N |
2101 | static ssize_t |
2102 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2103 | { | |
d7027458 | 2104 | unsigned long long size; |
c5d79adb | 2105 | unsigned long long oldsize = rdev->size; |
27c529bb N |
2106 | mddev_t *my_mddev = rdev->mddev; |
2107 | ||
d7027458 NB |
2108 | if (strict_strtoull(buf, 10, &size) < 0) |
2109 | return -EINVAL; | |
2110 | if (size < my_mddev->size) | |
83303b61 | 2111 | return -EINVAL; |
0cd17fec | 2112 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 NB |
2113 | if (my_mddev->persistent) { |
2114 | size = super_types[my_mddev->major_version]. | |
0cd17fec CW |
2115 | rdev_size_change(rdev, size); |
2116 | if (!size) | |
2117 | return -EBUSY; | |
2118 | } else if (!size) { | |
2119 | size = (rdev->bdev->bd_inode->i_size >> 10); | |
2120 | size -= rdev->data_offset/2; | |
2121 | } | |
d7027458 | 2122 | if (size < my_mddev->size) |
0cd17fec CW |
2123 | return -EINVAL; /* component must fit device */ |
2124 | } | |
2125 | ||
83303b61 | 2126 | rdev->size = size; |
d7027458 | 2127 | if (size > oldsize && my_mddev->external) { |
c5d79adb N |
2128 | /* need to check that all other rdevs with the same ->bdev |
2129 | * do not overlap. We need to unlock the mddev to avoid | |
2130 | * a deadlock. We have already changed rdev->size, and if | |
2131 | * we have to change it back, we will have the lock again. | |
2132 | */ | |
2133 | mddev_t *mddev; | |
2134 | int overlap = 0; | |
2135 | struct list_head *tmp, *tmp2; | |
2136 | ||
27c529bb | 2137 | mddev_unlock(my_mddev); |
29ac4aa3 | 2138 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2139 | mdk_rdev_t *rdev2; |
2140 | ||
2141 | mddev_lock(mddev); | |
d089c6af | 2142 | rdev_for_each(rdev2, tmp2, mddev) |
c5d79adb N |
2143 | if (test_bit(AllReserved, &rdev2->flags) || |
2144 | (rdev->bdev == rdev2->bdev && | |
2145 | rdev != rdev2 && | |
d07bd3bc AN |
2146 | overlaps(rdev->data_offset, rdev->size * 2, |
2147 | rdev2->data_offset, | |
2148 | rdev2->size * 2))) { | |
c5d79adb N |
2149 | overlap = 1; |
2150 | break; | |
2151 | } | |
2152 | mddev_unlock(mddev); | |
2153 | if (overlap) { | |
2154 | mddev_put(mddev); | |
2155 | break; | |
2156 | } | |
2157 | } | |
27c529bb | 2158 | mddev_lock(my_mddev); |
c5d79adb N |
2159 | if (overlap) { |
2160 | /* Someone else could have slipped in a size | |
2161 | * change here, but doing so is just silly. | |
2162 | * We put oldsize back because we *know* it is | |
2163 | * safe, and trust userspace not to race with | |
2164 | * itself | |
2165 | */ | |
2166 | rdev->size = oldsize; | |
2167 | return -EBUSY; | |
2168 | } | |
2169 | } | |
83303b61 N |
2170 | return len; |
2171 | } | |
2172 | ||
2173 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2174 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2175 | |
86e6ffdd N |
2176 | static struct attribute *rdev_default_attrs[] = { |
2177 | &rdev_state.attr, | |
4dbcdc75 | 2178 | &rdev_errors.attr, |
014236d2 | 2179 | &rdev_slot.attr, |
93c8cad0 | 2180 | &rdev_offset.attr, |
83303b61 | 2181 | &rdev_size.attr, |
86e6ffdd N |
2182 | NULL, |
2183 | }; | |
2184 | static ssize_t | |
2185 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2186 | { | |
2187 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2188 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2189 | mddev_t *mddev = rdev->mddev; |
2190 | ssize_t rv; | |
86e6ffdd N |
2191 | |
2192 | if (!entry->show) | |
2193 | return -EIO; | |
27c529bb N |
2194 | |
2195 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2196 | if (!rv) { | |
2197 | if (rdev->mddev == NULL) | |
2198 | rv = -EBUSY; | |
2199 | else | |
2200 | rv = entry->show(rdev, page); | |
2201 | mddev_unlock(mddev); | |
2202 | } | |
2203 | return rv; | |
86e6ffdd N |
2204 | } |
2205 | ||
2206 | static ssize_t | |
2207 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2208 | const char *page, size_t length) | |
2209 | { | |
2210 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2211 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2212 | ssize_t rv; |
2213 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2214 | |
2215 | if (!entry->store) | |
2216 | return -EIO; | |
67463acb N |
2217 | if (!capable(CAP_SYS_ADMIN)) |
2218 | return -EACCES; | |
27c529bb | 2219 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2220 | if (!rv) { |
27c529bb N |
2221 | if (rdev->mddev == NULL) |
2222 | rv = -EBUSY; | |
2223 | else | |
2224 | rv = entry->store(rdev, page, length); | |
6a51830e | 2225 | mddev_unlock(mddev); |
ca388059 N |
2226 | } |
2227 | return rv; | |
86e6ffdd N |
2228 | } |
2229 | ||
2230 | static void rdev_free(struct kobject *ko) | |
2231 | { | |
2232 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2233 | kfree(rdev); | |
2234 | } | |
2235 | static struct sysfs_ops rdev_sysfs_ops = { | |
2236 | .show = rdev_attr_show, | |
2237 | .store = rdev_attr_store, | |
2238 | }; | |
2239 | static struct kobj_type rdev_ktype = { | |
2240 | .release = rdev_free, | |
2241 | .sysfs_ops = &rdev_sysfs_ops, | |
2242 | .default_attrs = rdev_default_attrs, | |
2243 | }; | |
2244 | ||
1da177e4 LT |
2245 | /* |
2246 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2247 | * | |
2248 | * mark the device faulty if: | |
2249 | * | |
2250 | * - the device is nonexistent (zero size) | |
2251 | * - the device has no valid superblock | |
2252 | * | |
2253 | * a faulty rdev _never_ has rdev->sb set. | |
2254 | */ | |
2255 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2256 | { | |
2257 | char b[BDEVNAME_SIZE]; | |
2258 | int err; | |
2259 | mdk_rdev_t *rdev; | |
2260 | sector_t size; | |
2261 | ||
9ffae0cf | 2262 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2263 | if (!rdev) { |
2264 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2265 | return ERR_PTR(-ENOMEM); | |
2266 | } | |
1da177e4 LT |
2267 | |
2268 | if ((err = alloc_disk_sb(rdev))) | |
2269 | goto abort_free; | |
2270 | ||
c5d79adb | 2271 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2272 | if (err) |
2273 | goto abort_free; | |
2274 | ||
f9cb074b | 2275 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2276 | |
1da177e4 | 2277 | rdev->desc_nr = -1; |
2b6e8459 | 2278 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2279 | rdev->raid_disk = -1; |
b2d444d7 | 2280 | rdev->flags = 0; |
1da177e4 | 2281 | rdev->data_offset = 0; |
42543769 | 2282 | rdev->sb_events = 0; |
1da177e4 | 2283 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2284 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2285 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2286 | |
2287 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2288 | if (!size) { | |
2289 | printk(KERN_WARNING | |
2290 | "md: %s has zero or unknown size, marking faulty!\n", | |
2291 | bdevname(rdev->bdev,b)); | |
2292 | err = -EINVAL; | |
2293 | goto abort_free; | |
2294 | } | |
2295 | ||
2296 | if (super_format >= 0) { | |
2297 | err = super_types[super_format]. | |
2298 | load_super(rdev, NULL, super_minor); | |
2299 | if (err == -EINVAL) { | |
df968c4e N |
2300 | printk(KERN_WARNING |
2301 | "md: %s does not have a valid v%d.%d " | |
2302 | "superblock, not importing!\n", | |
2303 | bdevname(rdev->bdev,b), | |
2304 | super_format, super_minor); | |
1da177e4 LT |
2305 | goto abort_free; |
2306 | } | |
2307 | if (err < 0) { | |
2308 | printk(KERN_WARNING | |
2309 | "md: could not read %s's sb, not importing!\n", | |
2310 | bdevname(rdev->bdev,b)); | |
2311 | goto abort_free; | |
2312 | } | |
2313 | } | |
6bfe0b49 | 2314 | |
1da177e4 | 2315 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2316 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2317 | |
2318 | return rdev; | |
2319 | ||
2320 | abort_free: | |
2321 | if (rdev->sb_page) { | |
2322 | if (rdev->bdev) | |
2323 | unlock_rdev(rdev); | |
2324 | free_disk_sb(rdev); | |
2325 | } | |
2326 | kfree(rdev); | |
2327 | return ERR_PTR(err); | |
2328 | } | |
2329 | ||
2330 | /* | |
2331 | * Check a full RAID array for plausibility | |
2332 | */ | |
2333 | ||
2334 | ||
a757e64c | 2335 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2336 | { |
2337 | int i; | |
2338 | struct list_head *tmp; | |
2339 | mdk_rdev_t *rdev, *freshest; | |
2340 | char b[BDEVNAME_SIZE]; | |
2341 | ||
2342 | freshest = NULL; | |
d089c6af | 2343 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2344 | switch (super_types[mddev->major_version]. |
2345 | load_super(rdev, freshest, mddev->minor_version)) { | |
2346 | case 1: | |
2347 | freshest = rdev; | |
2348 | break; | |
2349 | case 0: | |
2350 | break; | |
2351 | default: | |
2352 | printk( KERN_ERR \ | |
2353 | "md: fatal superblock inconsistency in %s" | |
2354 | " -- removing from array\n", | |
2355 | bdevname(rdev->bdev,b)); | |
2356 | kick_rdev_from_array(rdev); | |
2357 | } | |
2358 | ||
2359 | ||
2360 | super_types[mddev->major_version]. | |
2361 | validate_super(mddev, freshest); | |
2362 | ||
2363 | i = 0; | |
d089c6af | 2364 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2365 | if (rdev != freshest) |
2366 | if (super_types[mddev->major_version]. | |
2367 | validate_super(mddev, rdev)) { | |
2368 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2369 | " from array!\n", | |
2370 | bdevname(rdev->bdev,b)); | |
2371 | kick_rdev_from_array(rdev); | |
2372 | continue; | |
2373 | } | |
2374 | if (mddev->level == LEVEL_MULTIPATH) { | |
2375 | rdev->desc_nr = i++; | |
2376 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2377 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2378 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2379 | rdev->raid_disk = -1; | |
2380 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2381 | } |
2382 | } | |
2383 | ||
2384 | ||
2385 | ||
2386 | if (mddev->recovery_cp != MaxSector && | |
2387 | mddev->level >= 1) | |
2388 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2389 | " -- starting background reconstruction\n", | |
2390 | mdname(mddev)); | |
2391 | ||
1da177e4 LT |
2392 | } |
2393 | ||
16f17b39 N |
2394 | static ssize_t |
2395 | safe_delay_show(mddev_t *mddev, char *page) | |
2396 | { | |
2397 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2398 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2399 | } | |
2400 | static ssize_t | |
2401 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2402 | { | |
2403 | int scale=1; | |
2404 | int dot=0; | |
2405 | int i; | |
2406 | unsigned long msec; | |
2407 | char buf[30]; | |
2408 | char *e; | |
2409 | /* remove a period, and count digits after it */ | |
2410 | if (len >= sizeof(buf)) | |
2411 | return -EINVAL; | |
2412 | strlcpy(buf, cbuf, len); | |
2413 | buf[len] = 0; | |
2414 | for (i=0; i<len; i++) { | |
2415 | if (dot) { | |
2416 | if (isdigit(buf[i])) { | |
2417 | buf[i-1] = buf[i]; | |
2418 | scale *= 10; | |
2419 | } | |
2420 | buf[i] = 0; | |
2421 | } else if (buf[i] == '.') { | |
2422 | dot=1; | |
2423 | buf[i] = 0; | |
2424 | } | |
2425 | } | |
2426 | msec = simple_strtoul(buf, &e, 10); | |
2427 | if (e == buf || (*e && *e != '\n')) | |
2428 | return -EINVAL; | |
2429 | msec = (msec * 1000) / scale; | |
2430 | if (msec == 0) | |
2431 | mddev->safemode_delay = 0; | |
2432 | else { | |
2433 | mddev->safemode_delay = (msec*HZ)/1000; | |
2434 | if (mddev->safemode_delay == 0) | |
2435 | mddev->safemode_delay = 1; | |
2436 | } | |
2437 | return len; | |
2438 | } | |
2439 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2440 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2441 | |
eae1701f | 2442 | static ssize_t |
96de1e66 | 2443 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2444 | { |
2604b703 | 2445 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2446 | if (p) |
eae1701f | 2447 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2448 | else if (mddev->clevel[0]) |
2449 | return sprintf(page, "%s\n", mddev->clevel); | |
2450 | else if (mddev->level != LEVEL_NONE) | |
2451 | return sprintf(page, "%d\n", mddev->level); | |
2452 | else | |
2453 | return 0; | |
eae1701f N |
2454 | } |
2455 | ||
d9d166c2 N |
2456 | static ssize_t |
2457 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2458 | { | |
20a49ff6 | 2459 | ssize_t rv = len; |
d9d166c2 N |
2460 | if (mddev->pers) |
2461 | return -EBUSY; | |
2462 | if (len == 0) | |
2463 | return 0; | |
2464 | if (len >= sizeof(mddev->clevel)) | |
2465 | return -ENOSPC; | |
2466 | strncpy(mddev->clevel, buf, len); | |
2467 | if (mddev->clevel[len-1] == '\n') | |
2468 | len--; | |
2469 | mddev->clevel[len] = 0; | |
2470 | mddev->level = LEVEL_NONE; | |
2471 | return rv; | |
2472 | } | |
2473 | ||
2474 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2475 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2476 | |
d4dbd025 N |
2477 | |
2478 | static ssize_t | |
2479 | layout_show(mddev_t *mddev, char *page) | |
2480 | { | |
2481 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2482 | if (mddev->reshape_position != MaxSector && |
2483 | mddev->layout != mddev->new_layout) | |
2484 | return sprintf(page, "%d (%d)\n", | |
2485 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2486 | return sprintf(page, "%d\n", mddev->layout); |
2487 | } | |
2488 | ||
2489 | static ssize_t | |
2490 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2491 | { | |
2492 | char *e; | |
2493 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2494 | |
2495 | if (!*buf || (*e && *e != '\n')) | |
2496 | return -EINVAL; | |
2497 | ||
08a02ecd N |
2498 | if (mddev->pers) |
2499 | return -EBUSY; | |
2500 | if (mddev->reshape_position != MaxSector) | |
2501 | mddev->new_layout = n; | |
2502 | else | |
2503 | mddev->layout = n; | |
d4dbd025 N |
2504 | return len; |
2505 | } | |
2506 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2507 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2508 | |
2509 | ||
eae1701f | 2510 | static ssize_t |
96de1e66 | 2511 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2512 | { |
bb636547 N |
2513 | if (mddev->raid_disks == 0) |
2514 | return 0; | |
08a02ecd N |
2515 | if (mddev->reshape_position != MaxSector && |
2516 | mddev->delta_disks != 0) | |
2517 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2518 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2519 | return sprintf(page, "%d\n", mddev->raid_disks); |
2520 | } | |
2521 | ||
da943b99 N |
2522 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2523 | ||
2524 | static ssize_t | |
2525 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2526 | { | |
da943b99 N |
2527 | char *e; |
2528 | int rv = 0; | |
2529 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2530 | ||
2531 | if (!*buf || (*e && *e != '\n')) | |
2532 | return -EINVAL; | |
2533 | ||
2534 | if (mddev->pers) | |
2535 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2536 | else if (mddev->reshape_position != MaxSector) { |
2537 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2538 | mddev->delta_disks = n - olddisks; | |
2539 | mddev->raid_disks = n; | |
2540 | } else | |
da943b99 N |
2541 | mddev->raid_disks = n; |
2542 | return rv ? rv : len; | |
2543 | } | |
2544 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2545 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2546 | |
3b34380a N |
2547 | static ssize_t |
2548 | chunk_size_show(mddev_t *mddev, char *page) | |
2549 | { | |
08a02ecd N |
2550 | if (mddev->reshape_position != MaxSector && |
2551 | mddev->chunk_size != mddev->new_chunk) | |
2552 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2553 | mddev->chunk_size); | |
3b34380a N |
2554 | return sprintf(page, "%d\n", mddev->chunk_size); |
2555 | } | |
2556 | ||
2557 | static ssize_t | |
2558 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2559 | { | |
2560 | /* can only set chunk_size if array is not yet active */ | |
2561 | char *e; | |
2562 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2563 | ||
3b34380a N |
2564 | if (!*buf || (*e && *e != '\n')) |
2565 | return -EINVAL; | |
2566 | ||
08a02ecd N |
2567 | if (mddev->pers) |
2568 | return -EBUSY; | |
2569 | else if (mddev->reshape_position != MaxSector) | |
2570 | mddev->new_chunk = n; | |
2571 | else | |
2572 | mddev->chunk_size = n; | |
3b34380a N |
2573 | return len; |
2574 | } | |
2575 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2576 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2577 | |
a94213b1 N |
2578 | static ssize_t |
2579 | resync_start_show(mddev_t *mddev, char *page) | |
2580 | { | |
2581 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2582 | } | |
2583 | ||
2584 | static ssize_t | |
2585 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2586 | { | |
a94213b1 N |
2587 | char *e; |
2588 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2589 | ||
2590 | if (mddev->pers) | |
2591 | return -EBUSY; | |
2592 | if (!*buf || (*e && *e != '\n')) | |
2593 | return -EINVAL; | |
2594 | ||
2595 | mddev->recovery_cp = n; | |
2596 | return len; | |
2597 | } | |
2598 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2599 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2600 | |
9e653b63 N |
2601 | /* |
2602 | * The array state can be: | |
2603 | * | |
2604 | * clear | |
2605 | * No devices, no size, no level | |
2606 | * Equivalent to STOP_ARRAY ioctl | |
2607 | * inactive | |
2608 | * May have some settings, but array is not active | |
2609 | * all IO results in error | |
2610 | * When written, doesn't tear down array, but just stops it | |
2611 | * suspended (not supported yet) | |
2612 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2613 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2614 | * readonly |
2615 | * no resync can happen. no superblocks get written. | |
2616 | * write requests fail | |
2617 | * read-auto | |
2618 | * like readonly, but behaves like 'clean' on a write request. | |
2619 | * | |
2620 | * clean - no pending writes, but otherwise active. | |
2621 | * When written to inactive array, starts without resync | |
2622 | * If a write request arrives then | |
2623 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2624 | * if not known, block and switch to write-pending | |
2625 | * If written to an active array that has pending writes, then fails. | |
2626 | * active | |
2627 | * fully active: IO and resync can be happening. | |
2628 | * When written to inactive array, starts with resync | |
2629 | * | |
2630 | * write-pending | |
2631 | * clean, but writes are blocked waiting for 'active' to be written. | |
2632 | * | |
2633 | * active-idle | |
2634 | * like active, but no writes have been seen for a while (100msec). | |
2635 | * | |
2636 | */ | |
2637 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2638 | write_pending, active_idle, bad_word}; | |
05381954 | 2639 | static char *array_states[] = { |
9e653b63 N |
2640 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2641 | "write-pending", "active-idle", NULL }; | |
2642 | ||
2643 | static int match_word(const char *word, char **list) | |
2644 | { | |
2645 | int n; | |
2646 | for (n=0; list[n]; n++) | |
2647 | if (cmd_match(word, list[n])) | |
2648 | break; | |
2649 | return n; | |
2650 | } | |
2651 | ||
2652 | static ssize_t | |
2653 | array_state_show(mddev_t *mddev, char *page) | |
2654 | { | |
2655 | enum array_state st = inactive; | |
2656 | ||
2657 | if (mddev->pers) | |
2658 | switch(mddev->ro) { | |
2659 | case 1: | |
2660 | st = readonly; | |
2661 | break; | |
2662 | case 2: | |
2663 | st = read_auto; | |
2664 | break; | |
2665 | case 0: | |
2666 | if (mddev->in_sync) | |
2667 | st = clean; | |
e691063a N |
2668 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2669 | st = write_pending; | |
9e653b63 N |
2670 | else if (mddev->safemode) |
2671 | st = active_idle; | |
2672 | else | |
2673 | st = active; | |
2674 | } | |
2675 | else { | |
2676 | if (list_empty(&mddev->disks) && | |
2677 | mddev->raid_disks == 0 && | |
2678 | mddev->size == 0) | |
2679 | st = clear; | |
2680 | else | |
2681 | st = inactive; | |
2682 | } | |
2683 | return sprintf(page, "%s\n", array_states[st]); | |
2684 | } | |
2685 | ||
df5b20cf | 2686 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
2687 | static int do_md_run(mddev_t * mddev); |
2688 | static int restart_array(mddev_t *mddev); | |
2689 | ||
2690 | static ssize_t | |
2691 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2692 | { | |
2693 | int err = -EINVAL; | |
2694 | enum array_state st = match_word(buf, array_states); | |
2695 | switch(st) { | |
2696 | case bad_word: | |
2697 | break; | |
2698 | case clear: | |
2699 | /* stopping an active array */ | |
e691063a N |
2700 | if (atomic_read(&mddev->active) > 1) |
2701 | return -EBUSY; | |
df5b20cf | 2702 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
2703 | break; |
2704 | case inactive: | |
2705 | /* stopping an active array */ | |
2706 | if (mddev->pers) { | |
2707 | if (atomic_read(&mddev->active) > 1) | |
2708 | return -EBUSY; | |
df5b20cf | 2709 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
2710 | } else |
2711 | err = 0; /* already inactive */ | |
9e653b63 N |
2712 | break; |
2713 | case suspended: | |
2714 | break; /* not supported yet */ | |
2715 | case readonly: | |
2716 | if (mddev->pers) | |
df5b20cf | 2717 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
2718 | else { |
2719 | mddev->ro = 1; | |
648b629e | 2720 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
2721 | err = do_md_run(mddev); |
2722 | } | |
2723 | break; | |
2724 | case read_auto: | |
9e653b63 | 2725 | if (mddev->pers) { |
648b629e | 2726 | if (mddev->ro != 1) |
df5b20cf | 2727 | err = do_md_stop(mddev, 1, 0); |
648b629e N |
2728 | else |
2729 | err = restart_array(mddev); | |
2730 | if (err == 0) { | |
2731 | mddev->ro = 2; | |
2732 | set_disk_ro(mddev->gendisk, 0); | |
2733 | } | |
9e653b63 N |
2734 | } else { |
2735 | mddev->ro = 2; | |
2736 | err = do_md_run(mddev); | |
2737 | } | |
2738 | break; | |
2739 | case clean: | |
2740 | if (mddev->pers) { | |
2741 | restart_array(mddev); | |
2742 | spin_lock_irq(&mddev->write_lock); | |
2743 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2744 | if (mddev->in_sync == 0) { |
2745 | mddev->in_sync = 1; | |
31a59e34 N |
2746 | if (mddev->safemode == 1) |
2747 | mddev->safemode = 0; | |
e691063a N |
2748 | if (mddev->persistent) |
2749 | set_bit(MD_CHANGE_CLEAN, | |
2750 | &mddev->flags); | |
2751 | } | |
2752 | err = 0; | |
2753 | } else | |
2754 | err = -EBUSY; | |
9e653b63 N |
2755 | spin_unlock_irq(&mddev->write_lock); |
2756 | } else { | |
2757 | mddev->ro = 0; | |
2758 | mddev->recovery_cp = MaxSector; | |
2759 | err = do_md_run(mddev); | |
2760 | } | |
2761 | break; | |
2762 | case active: | |
2763 | if (mddev->pers) { | |
2764 | restart_array(mddev); | |
e691063a N |
2765 | if (mddev->external) |
2766 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2767 | wake_up(&mddev->sb_wait); |
2768 | err = 0; | |
2769 | } else { | |
2770 | mddev->ro = 0; | |
648b629e | 2771 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
2772 | err = do_md_run(mddev); |
2773 | } | |
2774 | break; | |
2775 | case write_pending: | |
2776 | case active_idle: | |
2777 | /* these cannot be set */ | |
2778 | break; | |
2779 | } | |
2780 | if (err) | |
2781 | return err; | |
0fd62b86 NB |
2782 | else { |
2783 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
9e653b63 | 2784 | return len; |
0fd62b86 | 2785 | } |
9e653b63 | 2786 | } |
80ca3a44 N |
2787 | static struct md_sysfs_entry md_array_state = |
2788 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2789 | |
6d7ff738 N |
2790 | static ssize_t |
2791 | null_show(mddev_t *mddev, char *page) | |
2792 | { | |
2793 | return -EINVAL; | |
2794 | } | |
2795 | ||
2796 | static ssize_t | |
2797 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2798 | { | |
2799 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2800 | /* The new device is added to the array. | |
2801 | * If the array has a persistent superblock, we read the | |
2802 | * superblock to initialise info and check validity. | |
2803 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2804 | * which mainly checks size. | |
2805 | */ | |
2806 | char *e; | |
2807 | int major = simple_strtoul(buf, &e, 10); | |
2808 | int minor; | |
2809 | dev_t dev; | |
2810 | mdk_rdev_t *rdev; | |
2811 | int err; | |
2812 | ||
2813 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2814 | return -EINVAL; | |
2815 | minor = simple_strtoul(e+1, &e, 10); | |
2816 | if (*e && *e != '\n') | |
2817 | return -EINVAL; | |
2818 | dev = MKDEV(major, minor); | |
2819 | if (major != MAJOR(dev) || | |
2820 | minor != MINOR(dev)) | |
2821 | return -EOVERFLOW; | |
2822 | ||
2823 | ||
2824 | if (mddev->persistent) { | |
2825 | rdev = md_import_device(dev, mddev->major_version, | |
2826 | mddev->minor_version); | |
2827 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2828 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2829 | mdk_rdev_t, same_set); | |
2830 | err = super_types[mddev->major_version] | |
2831 | .load_super(rdev, rdev0, mddev->minor_version); | |
2832 | if (err < 0) | |
2833 | goto out; | |
2834 | } | |
c5d79adb N |
2835 | } else if (mddev->external) |
2836 | rdev = md_import_device(dev, -2, -1); | |
2837 | else | |
6d7ff738 N |
2838 | rdev = md_import_device(dev, -1, -1); |
2839 | ||
2840 | if (IS_ERR(rdev)) | |
2841 | return PTR_ERR(rdev); | |
2842 | err = bind_rdev_to_array(rdev, mddev); | |
2843 | out: | |
2844 | if (err) | |
2845 | export_rdev(rdev); | |
2846 | return err ? err : len; | |
2847 | } | |
2848 | ||
2849 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2850 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2851 | |
9b1d1dac PC |
2852 | static ssize_t |
2853 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2854 | { | |
2855 | char *end; | |
2856 | unsigned long chunk, end_chunk; | |
2857 | ||
2858 | if (!mddev->bitmap) | |
2859 | goto out; | |
2860 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2861 | while (*buf) { | |
2862 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2863 | if (buf == end) break; | |
2864 | if (*end == '-') { /* range */ | |
2865 | buf = end + 1; | |
2866 | end_chunk = simple_strtoul(buf, &end, 0); | |
2867 | if (buf == end) break; | |
2868 | } | |
2869 | if (*end && !isspace(*end)) break; | |
2870 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2871 | buf = end; | |
2872 | while (isspace(*buf)) buf++; | |
2873 | } | |
2874 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2875 | out: | |
2876 | return len; | |
2877 | } | |
2878 | ||
2879 | static struct md_sysfs_entry md_bitmap = | |
2880 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2881 | ||
a35b0d69 N |
2882 | static ssize_t |
2883 | size_show(mddev_t *mddev, char *page) | |
2884 | { | |
2885 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2886 | } | |
2887 | ||
d71f9f88 | 2888 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
2889 | |
2890 | static ssize_t | |
2891 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2892 | { | |
2893 | /* If array is inactive, we can reduce the component size, but | |
2894 | * not increase it (except from 0). | |
2895 | * If array is active, we can try an on-line resize | |
2896 | */ | |
2897 | char *e; | |
2898 | int err = 0; | |
2899 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2900 | if (!*buf || *buf == '\n' || | |
2901 | (*e && *e != '\n')) | |
2902 | return -EINVAL; | |
2903 | ||
2904 | if (mddev->pers) { | |
d71f9f88 | 2905 | err = update_size(mddev, size * 2); |
850b2b42 | 2906 | md_update_sb(mddev, 1); |
a35b0d69 N |
2907 | } else { |
2908 | if (mddev->size == 0 || | |
2909 | mddev->size > size) | |
2910 | mddev->size = size; | |
2911 | else | |
2912 | err = -ENOSPC; | |
2913 | } | |
2914 | return err ? err : len; | |
2915 | } | |
2916 | ||
2917 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 2918 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 2919 | |
8bb93aac N |
2920 | |
2921 | /* Metdata version. | |
e691063a N |
2922 | * This is one of |
2923 | * 'none' for arrays with no metadata (good luck...) | |
2924 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
2925 | * or N.M for internally known formats |
2926 | */ | |
2927 | static ssize_t | |
2928 | metadata_show(mddev_t *mddev, char *page) | |
2929 | { | |
2930 | if (mddev->persistent) | |
2931 | return sprintf(page, "%d.%d\n", | |
2932 | mddev->major_version, mddev->minor_version); | |
e691063a N |
2933 | else if (mddev->external) |
2934 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
2935 | else |
2936 | return sprintf(page, "none\n"); | |
2937 | } | |
2938 | ||
2939 | static ssize_t | |
2940 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2941 | { | |
2942 | int major, minor; | |
2943 | char *e; | |
2944 | if (!list_empty(&mddev->disks)) | |
2945 | return -EBUSY; | |
2946 | ||
2947 | if (cmd_match(buf, "none")) { | |
2948 | mddev->persistent = 0; | |
e691063a N |
2949 | mddev->external = 0; |
2950 | mddev->major_version = 0; | |
2951 | mddev->minor_version = 90; | |
2952 | return len; | |
2953 | } | |
2954 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 2955 | size_t namelen = len-9; |
e691063a N |
2956 | if (namelen >= sizeof(mddev->metadata_type)) |
2957 | namelen = sizeof(mddev->metadata_type)-1; | |
2958 | strncpy(mddev->metadata_type, buf+9, namelen); | |
2959 | mddev->metadata_type[namelen] = 0; | |
2960 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
2961 | mddev->metadata_type[--namelen] = 0; | |
2962 | mddev->persistent = 0; | |
2963 | mddev->external = 1; | |
8bb93aac N |
2964 | mddev->major_version = 0; |
2965 | mddev->minor_version = 90; | |
2966 | return len; | |
2967 | } | |
2968 | major = simple_strtoul(buf, &e, 10); | |
2969 | if (e==buf || *e != '.') | |
2970 | return -EINVAL; | |
2971 | buf = e+1; | |
2972 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 2973 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 2974 | return -EINVAL; |
50511da3 | 2975 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
2976 | return -ENOENT; |
2977 | mddev->major_version = major; | |
2978 | mddev->minor_version = minor; | |
2979 | mddev->persistent = 1; | |
e691063a | 2980 | mddev->external = 0; |
8bb93aac N |
2981 | return len; |
2982 | } | |
2983 | ||
2984 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 2985 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 2986 | |
24dd469d | 2987 | static ssize_t |
7eec314d | 2988 | action_show(mddev_t *mddev, char *page) |
24dd469d | 2989 | { |
7eec314d | 2990 | char *type = "idle"; |
31399d9e | 2991 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 2992 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
2993 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
2994 | type = "reshape"; | |
2995 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2996 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2997 | type = "resync"; | |
2998 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2999 | type = "check"; | |
3000 | else | |
3001 | type = "repair"; | |
72a23c21 | 3002 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3003 | type = "recover"; |
3004 | } | |
3005 | return sprintf(page, "%s\n", type); | |
3006 | } | |
3007 | ||
3008 | static ssize_t | |
7eec314d | 3009 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3010 | { |
7eec314d N |
3011 | if (!mddev->pers || !mddev->pers->sync_request) |
3012 | return -EINVAL; | |
3013 | ||
bce74dac | 3014 | if (cmd_match(page, "idle")) { |
7eec314d N |
3015 | if (mddev->sync_thread) { |
3016 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3017 | md_unregister_thread(mddev->sync_thread); | |
3018 | mddev->sync_thread = NULL; | |
3019 | mddev->recovery = 0; | |
3020 | } | |
03c902e1 N |
3021 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3022 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3023 | return -EBUSY; |
72a23c21 NB |
3024 | else if (cmd_match(page, "resync")) |
3025 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3026 | else if (cmd_match(page, "recover")) { | |
3027 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3028 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3029 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3030 | int err; |
3031 | if (mddev->pers->start_reshape == NULL) | |
3032 | return -EINVAL; | |
3033 | err = mddev->pers->start_reshape(mddev); | |
3034 | if (err) | |
3035 | return err; | |
a99ac971 | 3036 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3037 | } else { |
bce74dac | 3038 | if (cmd_match(page, "check")) |
7eec314d | 3039 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3040 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3041 | return -EINVAL; |
3042 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3043 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3044 | } |
03c902e1 | 3045 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3046 | md_wakeup_thread(mddev->thread); |
72a23c21 | 3047 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
24dd469d N |
3048 | return len; |
3049 | } | |
3050 | ||
9d88883e | 3051 | static ssize_t |
96de1e66 | 3052 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3053 | { |
3054 | return sprintf(page, "%llu\n", | |
3055 | (unsigned long long) mddev->resync_mismatches); | |
3056 | } | |
3057 | ||
80ca3a44 N |
3058 | static struct md_sysfs_entry md_scan_mode = |
3059 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3060 | |
96de1e66 | 3061 | |
80ca3a44 | 3062 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3063 | |
88202a0c N |
3064 | static ssize_t |
3065 | sync_min_show(mddev_t *mddev, char *page) | |
3066 | { | |
3067 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3068 | mddev->sync_speed_min ? "local": "system"); | |
3069 | } | |
3070 | ||
3071 | static ssize_t | |
3072 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3073 | { | |
3074 | int min; | |
3075 | char *e; | |
3076 | if (strncmp(buf, "system", 6)==0) { | |
3077 | mddev->sync_speed_min = 0; | |
3078 | return len; | |
3079 | } | |
3080 | min = simple_strtoul(buf, &e, 10); | |
3081 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3082 | return -EINVAL; | |
3083 | mddev->sync_speed_min = min; | |
3084 | return len; | |
3085 | } | |
3086 | ||
3087 | static struct md_sysfs_entry md_sync_min = | |
3088 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3089 | ||
3090 | static ssize_t | |
3091 | sync_max_show(mddev_t *mddev, char *page) | |
3092 | { | |
3093 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3094 | mddev->sync_speed_max ? "local": "system"); | |
3095 | } | |
3096 | ||
3097 | static ssize_t | |
3098 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3099 | { | |
3100 | int max; | |
3101 | char *e; | |
3102 | if (strncmp(buf, "system", 6)==0) { | |
3103 | mddev->sync_speed_max = 0; | |
3104 | return len; | |
3105 | } | |
3106 | max = simple_strtoul(buf, &e, 10); | |
3107 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3108 | return -EINVAL; | |
3109 | mddev->sync_speed_max = max; | |
3110 | return len; | |
3111 | } | |
3112 | ||
3113 | static struct md_sysfs_entry md_sync_max = | |
3114 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3115 | ||
d7f3d291 IP |
3116 | static ssize_t |
3117 | degraded_show(mddev_t *mddev, char *page) | |
3118 | { | |
3119 | return sprintf(page, "%d\n", mddev->degraded); | |
3120 | } | |
3121 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3122 | |
90b08710 BS |
3123 | static ssize_t |
3124 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3125 | { | |
3126 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3127 | } | |
3128 | ||
3129 | static ssize_t | |
3130 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3131 | { | |
3132 | long n; | |
3133 | ||
3134 | if (strict_strtol(buf, 10, &n)) | |
3135 | return -EINVAL; | |
3136 | ||
3137 | if (n != 0 && n != 1) | |
3138 | return -EINVAL; | |
3139 | ||
3140 | mddev->parallel_resync = n; | |
3141 | ||
3142 | if (mddev->sync_thread) | |
3143 | wake_up(&resync_wait); | |
3144 | ||
3145 | return len; | |
3146 | } | |
3147 | ||
3148 | /* force parallel resync, even with shared block devices */ | |
3149 | static struct md_sysfs_entry md_sync_force_parallel = | |
3150 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3151 | sync_force_parallel_show, sync_force_parallel_store); | |
3152 | ||
88202a0c N |
3153 | static ssize_t |
3154 | sync_speed_show(mddev_t *mddev, char *page) | |
3155 | { | |
3156 | unsigned long resync, dt, db; | |
9687a60c AN |
3157 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3158 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3159 | if (!dt) dt++; |
9687a60c AN |
3160 | db = resync - mddev->resync_mark_cnt; |
3161 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3162 | } |
3163 | ||
80ca3a44 | 3164 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3165 | |
3166 | static ssize_t | |
3167 | sync_completed_show(mddev_t *mddev, char *page) | |
3168 | { | |
3169 | unsigned long max_blocks, resync; | |
3170 | ||
3171 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3172 | max_blocks = mddev->resync_max_sectors; | |
3173 | else | |
3174 | max_blocks = mddev->size << 1; | |
3175 | ||
3176 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
3177 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
3178 | } | |
3179 | ||
80ca3a44 | 3180 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3181 | |
5e96ee65 NB |
3182 | static ssize_t |
3183 | min_sync_show(mddev_t *mddev, char *page) | |
3184 | { | |
3185 | return sprintf(page, "%llu\n", | |
3186 | (unsigned long long)mddev->resync_min); | |
3187 | } | |
3188 | static ssize_t | |
3189 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3190 | { | |
3191 | unsigned long long min; | |
3192 | if (strict_strtoull(buf, 10, &min)) | |
3193 | return -EINVAL; | |
3194 | if (min > mddev->resync_max) | |
3195 | return -EINVAL; | |
3196 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3197 | return -EBUSY; | |
3198 | ||
3199 | /* Must be a multiple of chunk_size */ | |
3200 | if (mddev->chunk_size) { | |
3201 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3202 | return -EINVAL; | |
3203 | } | |
3204 | mddev->resync_min = min; | |
3205 | ||
3206 | return len; | |
3207 | } | |
3208 | ||
3209 | static struct md_sysfs_entry md_min_sync = | |
3210 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3211 | ||
c6207277 N |
3212 | static ssize_t |
3213 | max_sync_show(mddev_t *mddev, char *page) | |
3214 | { | |
3215 | if (mddev->resync_max == MaxSector) | |
3216 | return sprintf(page, "max\n"); | |
3217 | else | |
3218 | return sprintf(page, "%llu\n", | |
3219 | (unsigned long long)mddev->resync_max); | |
3220 | } | |
3221 | static ssize_t | |
3222 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3223 | { | |
3224 | if (strncmp(buf, "max", 3) == 0) | |
3225 | mddev->resync_max = MaxSector; | |
3226 | else { | |
5e96ee65 NB |
3227 | unsigned long long max; |
3228 | if (strict_strtoull(buf, 10, &max)) | |
3229 | return -EINVAL; | |
3230 | if (max < mddev->resync_min) | |
c6207277 N |
3231 | return -EINVAL; |
3232 | if (max < mddev->resync_max && | |
3233 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3234 | return -EBUSY; | |
3235 | ||
3236 | /* Must be a multiple of chunk_size */ | |
3237 | if (mddev->chunk_size) { | |
3238 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3239 | return -EINVAL; | |
3240 | } | |
3241 | mddev->resync_max = max; | |
3242 | } | |
3243 | wake_up(&mddev->recovery_wait); | |
3244 | return len; | |
3245 | } | |
3246 | ||
3247 | static struct md_sysfs_entry md_max_sync = | |
3248 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3249 | ||
e464eafd N |
3250 | static ssize_t |
3251 | suspend_lo_show(mddev_t *mddev, char *page) | |
3252 | { | |
3253 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3254 | } | |
3255 | ||
3256 | static ssize_t | |
3257 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3258 | { | |
3259 | char *e; | |
3260 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3261 | ||
3262 | if (mddev->pers->quiesce == NULL) | |
3263 | return -EINVAL; | |
3264 | if (buf == e || (*e && *e != '\n')) | |
3265 | return -EINVAL; | |
3266 | if (new >= mddev->suspend_hi || | |
3267 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3268 | mddev->suspend_lo = new; | |
3269 | mddev->pers->quiesce(mddev, 2); | |
3270 | return len; | |
3271 | } else | |
3272 | return -EINVAL; | |
3273 | } | |
3274 | static struct md_sysfs_entry md_suspend_lo = | |
3275 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3276 | ||
3277 | ||
3278 | static ssize_t | |
3279 | suspend_hi_show(mddev_t *mddev, char *page) | |
3280 | { | |
3281 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3282 | } | |
3283 | ||
3284 | static ssize_t | |
3285 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3286 | { | |
3287 | char *e; | |
3288 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3289 | ||
3290 | if (mddev->pers->quiesce == NULL) | |
3291 | return -EINVAL; | |
3292 | if (buf == e || (*e && *e != '\n')) | |
3293 | return -EINVAL; | |
3294 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3295 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3296 | mddev->suspend_hi = new; | |
3297 | mddev->pers->quiesce(mddev, 1); | |
3298 | mddev->pers->quiesce(mddev, 0); | |
3299 | return len; | |
3300 | } else | |
3301 | return -EINVAL; | |
3302 | } | |
3303 | static struct md_sysfs_entry md_suspend_hi = | |
3304 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3305 | ||
08a02ecd N |
3306 | static ssize_t |
3307 | reshape_position_show(mddev_t *mddev, char *page) | |
3308 | { | |
3309 | if (mddev->reshape_position != MaxSector) | |
3310 | return sprintf(page, "%llu\n", | |
3311 | (unsigned long long)mddev->reshape_position); | |
3312 | strcpy(page, "none\n"); | |
3313 | return 5; | |
3314 | } | |
3315 | ||
3316 | static ssize_t | |
3317 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3318 | { | |
3319 | char *e; | |
3320 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3321 | if (mddev->pers) | |
3322 | return -EBUSY; | |
3323 | if (buf == e || (*e && *e != '\n')) | |
3324 | return -EINVAL; | |
3325 | mddev->reshape_position = new; | |
3326 | mddev->delta_disks = 0; | |
3327 | mddev->new_level = mddev->level; | |
3328 | mddev->new_layout = mddev->layout; | |
3329 | mddev->new_chunk = mddev->chunk_size; | |
3330 | return len; | |
3331 | } | |
3332 | ||
3333 | static struct md_sysfs_entry md_reshape_position = | |
3334 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3335 | reshape_position_store); | |
3336 | ||
e464eafd | 3337 | |
eae1701f N |
3338 | static struct attribute *md_default_attrs[] = { |
3339 | &md_level.attr, | |
d4dbd025 | 3340 | &md_layout.attr, |
eae1701f | 3341 | &md_raid_disks.attr, |
3b34380a | 3342 | &md_chunk_size.attr, |
a35b0d69 | 3343 | &md_size.attr, |
a94213b1 | 3344 | &md_resync_start.attr, |
8bb93aac | 3345 | &md_metadata.attr, |
6d7ff738 | 3346 | &md_new_device.attr, |
16f17b39 | 3347 | &md_safe_delay.attr, |
9e653b63 | 3348 | &md_array_state.attr, |
08a02ecd | 3349 | &md_reshape_position.attr, |
411036fa N |
3350 | NULL, |
3351 | }; | |
3352 | ||
3353 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3354 | &md_scan_mode.attr, |
9d88883e | 3355 | &md_mismatches.attr, |
88202a0c N |
3356 | &md_sync_min.attr, |
3357 | &md_sync_max.attr, | |
3358 | &md_sync_speed.attr, | |
90b08710 | 3359 | &md_sync_force_parallel.attr, |
88202a0c | 3360 | &md_sync_completed.attr, |
5e96ee65 | 3361 | &md_min_sync.attr, |
c6207277 | 3362 | &md_max_sync.attr, |
e464eafd N |
3363 | &md_suspend_lo.attr, |
3364 | &md_suspend_hi.attr, | |
9b1d1dac | 3365 | &md_bitmap.attr, |
d7f3d291 | 3366 | &md_degraded.attr, |
eae1701f N |
3367 | NULL, |
3368 | }; | |
411036fa N |
3369 | static struct attribute_group md_redundancy_group = { |
3370 | .name = NULL, | |
3371 | .attrs = md_redundancy_attrs, | |
3372 | }; | |
3373 | ||
eae1701f N |
3374 | |
3375 | static ssize_t | |
3376 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3377 | { | |
3378 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3379 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3380 | ssize_t rv; |
eae1701f N |
3381 | |
3382 | if (!entry->show) | |
3383 | return -EIO; | |
5dc5cf7d IM |
3384 | rv = mddev_lock(mddev); |
3385 | if (!rv) { | |
3386 | rv = entry->show(mddev, page); | |
3387 | mddev_unlock(mddev); | |
3388 | } | |
96de1e66 | 3389 | return rv; |
eae1701f N |
3390 | } |
3391 | ||
3392 | static ssize_t | |
3393 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3394 | const char *page, size_t length) | |
3395 | { | |
3396 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3397 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3398 | ssize_t rv; |
eae1701f N |
3399 | |
3400 | if (!entry->store) | |
3401 | return -EIO; | |
67463acb N |
3402 | if (!capable(CAP_SYS_ADMIN)) |
3403 | return -EACCES; | |
5dc5cf7d IM |
3404 | rv = mddev_lock(mddev); |
3405 | if (!rv) { | |
3406 | rv = entry->store(mddev, page, length); | |
3407 | mddev_unlock(mddev); | |
3408 | } | |
96de1e66 | 3409 | return rv; |
eae1701f N |
3410 | } |
3411 | ||
3412 | static void md_free(struct kobject *ko) | |
3413 | { | |
3414 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
3415 | kfree(mddev); | |
3416 | } | |
3417 | ||
3418 | static struct sysfs_ops md_sysfs_ops = { | |
3419 | .show = md_attr_show, | |
3420 | .store = md_attr_store, | |
3421 | }; | |
3422 | static struct kobj_type md_ktype = { | |
3423 | .release = md_free, | |
3424 | .sysfs_ops = &md_sysfs_ops, | |
3425 | .default_attrs = md_default_attrs, | |
3426 | }; | |
3427 | ||
1da177e4 LT |
3428 | int mdp_major = 0; |
3429 | ||
3430 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3431 | { | |
48c9c27b | 3432 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3433 | mddev_t *mddev = mddev_find(dev); |
3434 | struct gendisk *disk; | |
3435 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
3436 | int shift = partitioned ? MdpMinorShift : 0; | |
3437 | int unit = MINOR(dev) >> shift; | |
3830c62f | 3438 | int error; |
1da177e4 LT |
3439 | |
3440 | if (!mddev) | |
3441 | return NULL; | |
3442 | ||
48c9c27b | 3443 | mutex_lock(&disks_mutex); |
1da177e4 | 3444 | if (mddev->gendisk) { |
48c9c27b | 3445 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3446 | mddev_put(mddev); |
3447 | return NULL; | |
3448 | } | |
3449 | disk = alloc_disk(1 << shift); | |
3450 | if (!disk) { | |
48c9c27b | 3451 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3452 | mddev_put(mddev); |
3453 | return NULL; | |
3454 | } | |
3455 | disk->major = MAJOR(dev); | |
3456 | disk->first_minor = unit << shift; | |
ce7b0f46 | 3457 | if (partitioned) |
1da177e4 | 3458 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3459 | else |
1da177e4 | 3460 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3461 | disk->fops = &md_fops; |
3462 | disk->private_data = mddev; | |
3463 | disk->queue = mddev->queue; | |
3464 | add_disk(disk); | |
3465 | mddev->gendisk = disk; | |
edfaa7c3 | 3466 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj, |
3830c62f | 3467 | "%s", "md"); |
f48ed538 | 3468 | mutex_unlock(&disks_mutex); |
3830c62f | 3469 | if (error) |
5e55e2f5 N |
3470 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3471 | disk->disk_name); | |
3830c62f GKH |
3472 | else |
3473 | kobject_uevent(&mddev->kobj, KOBJ_ADD); | |
1da177e4 LT |
3474 | return NULL; |
3475 | } | |
3476 | ||
1da177e4 LT |
3477 | static void md_safemode_timeout(unsigned long data) |
3478 | { | |
3479 | mddev_t *mddev = (mddev_t *) data; | |
3480 | ||
0fd62b86 NB |
3481 | if (!atomic_read(&mddev->writes_pending)) { |
3482 | mddev->safemode = 1; | |
3483 | if (mddev->external) | |
3484 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
3485 | } | |
1da177e4 LT |
3486 | md_wakeup_thread(mddev->thread); |
3487 | } | |
3488 | ||
6ff8d8ec | 3489 | static int start_dirty_degraded; |
1da177e4 LT |
3490 | |
3491 | static int do_md_run(mddev_t * mddev) | |
3492 | { | |
2604b703 | 3493 | int err; |
1da177e4 LT |
3494 | int chunk_size; |
3495 | struct list_head *tmp; | |
3496 | mdk_rdev_t *rdev; | |
3497 | struct gendisk *disk; | |
2604b703 | 3498 | struct mdk_personality *pers; |
1da177e4 LT |
3499 | char b[BDEVNAME_SIZE]; |
3500 | ||
a757e64c N |
3501 | if (list_empty(&mddev->disks)) |
3502 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3503 | return -EINVAL; |
1da177e4 LT |
3504 | |
3505 | if (mddev->pers) | |
3506 | return -EBUSY; | |
3507 | ||
3508 | /* | |
3509 | * Analyze all RAID superblock(s) | |
3510 | */ | |
1ec4a939 N |
3511 | if (!mddev->raid_disks) { |
3512 | if (!mddev->persistent) | |
3513 | return -EINVAL; | |
a757e64c | 3514 | analyze_sbs(mddev); |
1ec4a939 | 3515 | } |
1da177e4 LT |
3516 | |
3517 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3518 | |
3519 | if (chunk_size) { | |
1da177e4 LT |
3520 | if (chunk_size > MAX_CHUNK_SIZE) { |
3521 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3522 | chunk_size, MAX_CHUNK_SIZE); | |
3523 | return -EINVAL; | |
3524 | } | |
3525 | /* | |
3526 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
3527 | */ | |
3528 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3529 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3530 | return -EINVAL; |
3531 | } | |
3532 | if (chunk_size < PAGE_SIZE) { | |
3533 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
3534 | chunk_size, PAGE_SIZE); | |
3535 | return -EINVAL; | |
3536 | } | |
3537 | ||
3538 | /* devices must have minimum size of one chunk */ | |
d089c6af | 3539 | rdev_for_each(rdev, tmp, mddev) { |
b2d444d7 | 3540 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3541 | continue; |
3542 | if (rdev->size < chunk_size / 1024) { | |
3543 | printk(KERN_WARNING | |
3544 | "md: Dev %s smaller than chunk_size:" | |
3545 | " %lluk < %dk\n", | |
3546 | bdevname(rdev->bdev,b), | |
3547 | (unsigned long long)rdev->size, | |
3548 | chunk_size / 1024); | |
3549 | return -EINVAL; | |
3550 | } | |
3551 | } | |
3552 | } | |
3553 | ||
1da177e4 | 3554 | #ifdef CONFIG_KMOD |
d9d166c2 N |
3555 | if (mddev->level != LEVEL_NONE) |
3556 | request_module("md-level-%d", mddev->level); | |
3557 | else if (mddev->clevel[0]) | |
3558 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3559 | #endif |
3560 | ||
3561 | /* | |
3562 | * Drop all container device buffers, from now on | |
3563 | * the only valid external interface is through the md | |
3564 | * device. | |
1da177e4 | 3565 | */ |
d089c6af | 3566 | rdev_for_each(rdev, tmp, mddev) { |
b2d444d7 | 3567 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3568 | continue; |
3569 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3570 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3571 | |
3572 | /* perform some consistency tests on the device. | |
3573 | * We don't want the data to overlap the metadata, | |
3574 | * Internal Bitmap issues has handled elsewhere. | |
3575 | */ | |
0f420358 | 3576 | if (rdev->data_offset < rdev->sb_start) { |
f0d76d70 N |
3577 | if (mddev->size && |
3578 | rdev->data_offset + mddev->size*2 | |
0f420358 | 3579 | > rdev->sb_start) { |
f0d76d70 N |
3580 | printk("md: %s: data overlaps metadata\n", |
3581 | mdname(mddev)); | |
3582 | return -EINVAL; | |
3583 | } | |
3584 | } else { | |
0f420358 | 3585 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
3586 | > rdev->data_offset) { |
3587 | printk("md: %s: metadata overlaps data\n", | |
3588 | mdname(mddev)); | |
3589 | return -EINVAL; | |
3590 | } | |
3591 | } | |
52664732 | 3592 | sysfs_notify(&rdev->kobj, NULL, "state"); |
1da177e4 LT |
3593 | } |
3594 | ||
3595 | md_probe(mddev->unit, NULL, NULL); | |
3596 | disk = mddev->gendisk; | |
3597 | if (!disk) | |
3598 | return -ENOMEM; | |
3599 | ||
3600 | spin_lock(&pers_lock); | |
d9d166c2 | 3601 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3602 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3603 | spin_unlock(&pers_lock); |
d9d166c2 N |
3604 | if (mddev->level != LEVEL_NONE) |
3605 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3606 | mddev->level); | |
3607 | else | |
3608 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3609 | mddev->clevel); | |
1da177e4 LT |
3610 | return -EINVAL; |
3611 | } | |
2604b703 | 3612 | mddev->pers = pers; |
1da177e4 | 3613 | spin_unlock(&pers_lock); |
d9d166c2 N |
3614 | mddev->level = pers->level; |
3615 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3616 | |
f6705578 | 3617 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3618 | pers->start_reshape == NULL) { |
f6705578 N |
3619 | /* This personality cannot handle reshaping... */ |
3620 | mddev->pers = NULL; | |
3621 | module_put(pers->owner); | |
3622 | return -EINVAL; | |
3623 | } | |
3624 | ||
7dd5e7c3 N |
3625 | if (pers->sync_request) { |
3626 | /* Warn if this is a potentially silly | |
3627 | * configuration. | |
3628 | */ | |
3629 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3630 | mdk_rdev_t *rdev2; | |
3631 | struct list_head *tmp2; | |
3632 | int warned = 0; | |
d089c6af N |
3633 | rdev_for_each(rdev, tmp, mddev) { |
3634 | rdev_for_each(rdev2, tmp2, mddev) { | |
7dd5e7c3 N |
3635 | if (rdev < rdev2 && |
3636 | rdev->bdev->bd_contains == | |
3637 | rdev2->bdev->bd_contains) { | |
3638 | printk(KERN_WARNING | |
3639 | "%s: WARNING: %s appears to be" | |
3640 | " on the same physical disk as" | |
3641 | " %s.\n", | |
3642 | mdname(mddev), | |
3643 | bdevname(rdev->bdev,b), | |
3644 | bdevname(rdev2->bdev,b2)); | |
3645 | warned = 1; | |
3646 | } | |
3647 | } | |
3648 | } | |
3649 | if (warned) | |
3650 | printk(KERN_WARNING | |
3651 | "True protection against single-disk" | |
3652 | " failure might be compromised.\n"); | |
3653 | } | |
3654 | ||
657390d2 | 3655 | mddev->recovery = 0; |
1da177e4 | 3656 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3657 | mddev->barriers_work = 1; |
6ff8d8ec | 3658 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3659 | |
f91de92e N |
3660 | if (start_readonly) |
3661 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3662 | ||
b15c2e57 | 3663 | err = mddev->pers->run(mddev); |
13e53df3 AN |
3664 | if (err) |
3665 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3666 | else if (mddev->pers->sync_request) { | |
b15c2e57 N |
3667 | err = bitmap_create(mddev); |
3668 | if (err) { | |
3669 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3670 | mdname(mddev), err); | |
3671 | mddev->pers->stop(mddev); | |
3672 | } | |
3673 | } | |
1da177e4 | 3674 | if (err) { |
1da177e4 LT |
3675 | module_put(mddev->pers->owner); |
3676 | mddev->pers = NULL; | |
32a7627c N |
3677 | bitmap_destroy(mddev); |
3678 | return err; | |
1da177e4 | 3679 | } |
5e55e2f5 N |
3680 | if (mddev->pers->sync_request) { |
3681 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3682 | printk(KERN_WARNING | |
3683 | "md: cannot register extra attributes for %s\n", | |
3684 | mdname(mddev)); | |
3685 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ | |
fd9d49ca N |
3686 | mddev->ro = 0; |
3687 | ||
1da177e4 LT |
3688 | atomic_set(&mddev->writes_pending,0); |
3689 | mddev->safemode = 0; | |
3690 | mddev->safemode_timer.function = md_safemode_timeout; | |
3691 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3692 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3693 | mddev->in_sync = 1; |
86e6ffdd | 3694 | |
d089c6af | 3695 | rdev_for_each(rdev, tmp, mddev) |
86e6ffdd N |
3696 | if (rdev->raid_disk >= 0) { |
3697 | char nm[20]; | |
3698 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3699 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3700 | printk("md: cannot register %s for %s\n", | |
3701 | nm, mdname(mddev)); | |
86e6ffdd | 3702 | } |
1da177e4 LT |
3703 | |
3704 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3705 | ||
850b2b42 N |
3706 | if (mddev->flags) |
3707 | md_update_sb(mddev, 0); | |
1da177e4 LT |
3708 | |
3709 | set_capacity(disk, mddev->array_size<<1); | |
3710 | ||
3711 | /* If we call blk_queue_make_request here, it will | |
3712 | * re-initialise max_sectors etc which may have been | |
3713 | * refined inside -> run. So just set the bits we need to set. | |
3714 | * Most initialisation happended when we called | |
3715 | * blk_queue_make_request(..., md_fail_request) | |
3716 | * earlier. | |
3717 | */ | |
3718 | mddev->queue->queuedata = mddev; | |
3719 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3720 | ||
5fd6c1dc N |
3721 | /* If there is a partially-recovered drive we need to |
3722 | * start recovery here. If we leave it to md_check_recovery, | |
3723 | * it will remove the drives and not do the right thing | |
3724 | */ | |
0b8c9de0 | 3725 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc N |
3726 | struct list_head *rtmp; |
3727 | int spares = 0; | |
d089c6af | 3728 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
3729 | if (rdev->raid_disk >= 0 && |
3730 | !test_bit(In_sync, &rdev->flags) && | |
3731 | !test_bit(Faulty, &rdev->flags)) | |
3732 | /* complete an interrupted recovery */ | |
3733 | spares++; | |
3734 | if (spares && mddev->pers->sync_request) { | |
3735 | mddev->recovery = 0; | |
3736 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3737 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3738 | mddev, | |
3739 | "%s_resync"); | |
3740 | if (!mddev->sync_thread) { | |
3741 | printk(KERN_ERR "%s: could not start resync" | |
3742 | " thread...\n", | |
3743 | mdname(mddev)); | |
3744 | /* leave the spares where they are, it shouldn't hurt */ | |
3745 | mddev->recovery = 0; | |
0b8c9de0 | 3746 | } |
5fd6c1dc N |
3747 | } |
3748 | } | |
0b8c9de0 N |
3749 | md_wakeup_thread(mddev->thread); |
3750 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3751 | |
44ce6294 | 3752 | mddev->changed = 1; |
d7603b7e | 3753 | md_new_event(mddev); |
0fd62b86 | 3754 | sysfs_notify(&mddev->kobj, NULL, "array_state"); |
72a23c21 | 3755 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
a99ac971 | 3756 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
edfaa7c3 | 3757 | kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE); |
1da177e4 LT |
3758 | return 0; |
3759 | } | |
3760 | ||
3761 | static int restart_array(mddev_t *mddev) | |
3762 | { | |
3763 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 3764 | |
80fab1d7 | 3765 | /* Complain if it has no devices */ |
1da177e4 | 3766 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
3767 | return -ENXIO; |
3768 | if (!mddev->pers) | |
3769 | return -EINVAL; | |
3770 | if (!mddev->ro) | |
3771 | return -EBUSY; | |
3772 | mddev->safemode = 0; | |
3773 | mddev->ro = 0; | |
3774 | set_disk_ro(disk, 0); | |
3775 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3776 | mdname(mddev)); | |
3777 | /* Kick recovery or resync if necessary */ | |
3778 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3779 | md_wakeup_thread(mddev->thread); | |
3780 | md_wakeup_thread(mddev->sync_thread); | |
3781 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
3782 | return 0; | |
1da177e4 LT |
3783 | } |
3784 | ||
acc55e22 N |
3785 | /* similar to deny_write_access, but accounts for our holding a reference |
3786 | * to the file ourselves */ | |
3787 | static int deny_bitmap_write_access(struct file * file) | |
3788 | { | |
3789 | struct inode *inode = file->f_mapping->host; | |
3790 | ||
3791 | spin_lock(&inode->i_lock); | |
3792 | if (atomic_read(&inode->i_writecount) > 1) { | |
3793 | spin_unlock(&inode->i_lock); | |
3794 | return -ETXTBSY; | |
3795 | } | |
3796 | atomic_set(&inode->i_writecount, -1); | |
3797 | spin_unlock(&inode->i_lock); | |
3798 | ||
3799 | return 0; | |
3800 | } | |
3801 | ||
3802 | static void restore_bitmap_write_access(struct file *file) | |
3803 | { | |
3804 | struct inode *inode = file->f_mapping->host; | |
3805 | ||
3806 | spin_lock(&inode->i_lock); | |
3807 | atomic_set(&inode->i_writecount, 1); | |
3808 | spin_unlock(&inode->i_lock); | |
3809 | } | |
3810 | ||
9e653b63 N |
3811 | /* mode: |
3812 | * 0 - completely stop and dis-assemble array | |
3813 | * 1 - switch to readonly | |
3814 | * 2 - stop but do not disassemble array | |
3815 | */ | |
df5b20cf | 3816 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
3817 | { |
3818 | int err = 0; | |
3819 | struct gendisk *disk = mddev->gendisk; | |
3820 | ||
df5b20cf NB |
3821 | if (atomic_read(&mddev->active) > 1 + is_open) { |
3822 | printk("md: %s still in use.\n",mdname(mddev)); | |
3823 | return -EBUSY; | |
3824 | } | |
3825 | ||
1da177e4 | 3826 | if (mddev->pers) { |
1da177e4 LT |
3827 | |
3828 | if (mddev->sync_thread) { | |
5fd6c1dc | 3829 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3830 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3831 | md_unregister_thread(mddev->sync_thread); | |
3832 | mddev->sync_thread = NULL; | |
3833 | } | |
3834 | ||
3835 | del_timer_sync(&mddev->safemode_timer); | |
3836 | ||
3837 | invalidate_partition(disk, 0); | |
3838 | ||
9e653b63 N |
3839 | switch(mode) { |
3840 | case 1: /* readonly */ | |
1da177e4 | 3841 | err = -ENXIO; |
f91de92e | 3842 | if (mddev->ro==1) |
1da177e4 LT |
3843 | goto out; |
3844 | mddev->ro = 1; | |
9e653b63 N |
3845 | break; |
3846 | case 0: /* disassemble */ | |
3847 | case 2: /* stop */ | |
6b8b3e8a | 3848 | bitmap_flush(mddev); |
a9701a30 | 3849 | md_super_wait(mddev); |
1da177e4 LT |
3850 | if (mddev->ro) |
3851 | set_disk_ro(disk, 0); | |
3852 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3853 | mddev->pers->stop(mddev); | |
d1b5380c N |
3854 | mddev->queue->merge_bvec_fn = NULL; |
3855 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 3856 | mddev->queue->backing_dev_info.congested_fn = NULL; |
411036fa N |
3857 | if (mddev->pers->sync_request) |
3858 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
3859 | ||
1da177e4 LT |
3860 | module_put(mddev->pers->owner); |
3861 | mddev->pers = NULL; | |
4f54b0e9 DW |
3862 | /* tell userspace to handle 'inactive' */ |
3863 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
0d4ca600 N |
3864 | |
3865 | set_capacity(disk, 0); | |
44ce6294 | 3866 | mddev->changed = 1; |
0d4ca600 | 3867 | |
1da177e4 LT |
3868 | if (mddev->ro) |
3869 | mddev->ro = 0; | |
3870 | } | |
850b2b42 | 3871 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
3872 | /* mark array as shutdown cleanly */ |
3873 | mddev->in_sync = 1; | |
850b2b42 | 3874 | md_update_sb(mddev, 1); |
1da177e4 | 3875 | } |
9e653b63 | 3876 | if (mode == 1) |
1da177e4 | 3877 | set_disk_ro(disk, 1); |
5fd6c1dc | 3878 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3879 | } |
32a7627c | 3880 | |
1da177e4 LT |
3881 | /* |
3882 | * Free resources if final stop | |
3883 | */ | |
9e653b63 | 3884 | if (mode == 0) { |
86e6ffdd N |
3885 | mdk_rdev_t *rdev; |
3886 | struct list_head *tmp; | |
0d4ca600 | 3887 | |
1da177e4 LT |
3888 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
3889 | ||
978f946b N |
3890 | bitmap_destroy(mddev); |
3891 | if (mddev->bitmap_file) { | |
acc55e22 | 3892 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3893 | fput(mddev->bitmap_file); |
3894 | mddev->bitmap_file = NULL; | |
3895 | } | |
3896 | mddev->bitmap_offset = 0; | |
3897 | ||
d089c6af | 3898 | rdev_for_each(rdev, tmp, mddev) |
86e6ffdd N |
3899 | if (rdev->raid_disk >= 0) { |
3900 | char nm[20]; | |
3901 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3902 | sysfs_remove_link(&mddev->kobj, nm); | |
3903 | } | |
3904 | ||
177a99b2 | 3905 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
3906 | flush_scheduled_work(); |
3907 | ||
1da177e4 LT |
3908 | export_array(mddev); |
3909 | ||
3910 | mddev->array_size = 0; | |
9e653b63 N |
3911 | mddev->size = 0; |
3912 | mddev->raid_disks = 0; | |
a94213b1 | 3913 | mddev->recovery_cp = 0; |
5e96ee65 | 3914 | mddev->resync_min = 0; |
c6207277 | 3915 | mddev->resync_max = MaxSector; |
08a02ecd | 3916 | mddev->reshape_position = MaxSector; |
e691063a | 3917 | mddev->external = 0; |
1ec4a939 | 3918 | mddev->persistent = 0; |
d897dbf9 N |
3919 | mddev->level = LEVEL_NONE; |
3920 | mddev->clevel[0] = 0; | |
3921 | mddev->flags = 0; | |
3922 | mddev->ro = 0; | |
3923 | mddev->metadata_type[0] = 0; | |
3924 | mddev->chunk_size = 0; | |
3925 | mddev->ctime = mddev->utime = 0; | |
3926 | mddev->layout = 0; | |
3927 | mddev->max_disks = 0; | |
3928 | mddev->events = 0; | |
3929 | mddev->delta_disks = 0; | |
3930 | mddev->new_level = LEVEL_NONE; | |
3931 | mddev->new_layout = 0; | |
3932 | mddev->new_chunk = 0; | |
3933 | mddev->curr_resync = 0; | |
3934 | mddev->resync_mismatches = 0; | |
3935 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
3936 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
3937 | mddev->recovery = 0; | |
3938 | mddev->in_sync = 0; | |
3939 | mddev->changed = 0; | |
3940 | mddev->degraded = 0; | |
3941 | mddev->barriers_work = 0; | |
3942 | mddev->safemode = 0; | |
9e653b63 | 3943 | |
a8a55c38 | 3944 | } else if (mddev->pers) |
1da177e4 LT |
3945 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
3946 | mdname(mddev)); | |
3947 | err = 0; | |
d7603b7e | 3948 | md_new_event(mddev); |
0fd62b86 | 3949 | sysfs_notify(&mddev->kobj, NULL, "array_state"); |
1da177e4 LT |
3950 | out: |
3951 | return err; | |
3952 | } | |
3953 | ||
fdee8ae4 | 3954 | #ifndef MODULE |
1da177e4 LT |
3955 | static void autorun_array(mddev_t *mddev) |
3956 | { | |
3957 | mdk_rdev_t *rdev; | |
3958 | struct list_head *tmp; | |
3959 | int err; | |
3960 | ||
a757e64c | 3961 | if (list_empty(&mddev->disks)) |
1da177e4 | 3962 | return; |
1da177e4 LT |
3963 | |
3964 | printk(KERN_INFO "md: running: "); | |
3965 | ||
d089c6af | 3966 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
3967 | char b[BDEVNAME_SIZE]; |
3968 | printk("<%s>", bdevname(rdev->bdev,b)); | |
3969 | } | |
3970 | printk("\n"); | |
3971 | ||
3972 | err = do_md_run (mddev); | |
3973 | if (err) { | |
3974 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
df5b20cf | 3975 | do_md_stop (mddev, 0, 0); |
1da177e4 LT |
3976 | } |
3977 | } | |
3978 | ||
3979 | /* | |
3980 | * lets try to run arrays based on all disks that have arrived | |
3981 | * until now. (those are in pending_raid_disks) | |
3982 | * | |
3983 | * the method: pick the first pending disk, collect all disks with | |
3984 | * the same UUID, remove all from the pending list and put them into | |
3985 | * the 'same_array' list. Then order this list based on superblock | |
3986 | * update time (freshest comes first), kick out 'old' disks and | |
3987 | * compare superblocks. If everything's fine then run it. | |
3988 | * | |
3989 | * If "unit" is allocated, then bump its reference count | |
3990 | */ | |
3991 | static void autorun_devices(int part) | |
3992 | { | |
1da177e4 LT |
3993 | struct list_head *tmp; |
3994 | mdk_rdev_t *rdev0, *rdev; | |
3995 | mddev_t *mddev; | |
3996 | char b[BDEVNAME_SIZE]; | |
3997 | ||
3998 | printk(KERN_INFO "md: autorun ...\n"); | |
3999 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4000 | int unit; |
1da177e4 | 4001 | dev_t dev; |
ad01c9e3 | 4002 | LIST_HEAD(candidates); |
1da177e4 LT |
4003 | rdev0 = list_entry(pending_raid_disks.next, |
4004 | mdk_rdev_t, same_set); | |
4005 | ||
4006 | printk(KERN_INFO "md: considering %s ...\n", | |
4007 | bdevname(rdev0->bdev,b)); | |
4008 | INIT_LIST_HEAD(&candidates); | |
73c34431 | 4009 | rdev_for_each_list(rdev, tmp, pending_raid_disks) |
1da177e4 LT |
4010 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4011 | printk(KERN_INFO "md: adding %s ...\n", | |
4012 | bdevname(rdev->bdev,b)); | |
4013 | list_move(&rdev->same_set, &candidates); | |
4014 | } | |
4015 | /* | |
4016 | * now we have a set of devices, with all of them having | |
4017 | * mostly sane superblocks. It's time to allocate the | |
4018 | * mddev. | |
4019 | */ | |
e8703fe1 N |
4020 | if (part) { |
4021 | dev = MKDEV(mdp_major, | |
4022 | rdev0->preferred_minor << MdpMinorShift); | |
4023 | unit = MINOR(dev) >> MdpMinorShift; | |
4024 | } else { | |
4025 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4026 | unit = MINOR(dev); | |
4027 | } | |
4028 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4029 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4030 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4031 | break; | |
4032 | } | |
1da177e4 LT |
4033 | |
4034 | md_probe(dev, NULL, NULL); | |
4035 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4036 | if (!mddev || !mddev->gendisk) { |
4037 | if (mddev) | |
4038 | mddev_put(mddev); | |
4039 | printk(KERN_ERR | |
1da177e4 LT |
4040 | "md: cannot allocate memory for md drive.\n"); |
4041 | break; | |
4042 | } | |
4043 | if (mddev_lock(mddev)) | |
4044 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4045 | mdname(mddev)); | |
4046 | else if (mddev->raid_disks || mddev->major_version | |
4047 | || !list_empty(&mddev->disks)) { | |
4048 | printk(KERN_WARNING | |
4049 | "md: %s already running, cannot run %s\n", | |
4050 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4051 | mddev_unlock(mddev); | |
4052 | } else { | |
4053 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4054 | mddev->persistent = 1; |
73c34431 | 4055 | rdev_for_each_list(rdev, tmp, candidates) { |
1da177e4 LT |
4056 | list_del_init(&rdev->same_set); |
4057 | if (bind_rdev_to_array(rdev, mddev)) | |
4058 | export_rdev(rdev); | |
4059 | } | |
4060 | autorun_array(mddev); | |
4061 | mddev_unlock(mddev); | |
4062 | } | |
4063 | /* on success, candidates will be empty, on error | |
4064 | * it won't... | |
4065 | */ | |
73c34431 | 4066 | rdev_for_each_list(rdev, tmp, candidates) |
1da177e4 LT |
4067 | export_rdev(rdev); |
4068 | mddev_put(mddev); | |
4069 | } | |
4070 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4071 | } | |
fdee8ae4 | 4072 | #endif /* !MODULE */ |
1da177e4 | 4073 | |
1da177e4 LT |
4074 | static int get_version(void __user * arg) |
4075 | { | |
4076 | mdu_version_t ver; | |
4077 | ||
4078 | ver.major = MD_MAJOR_VERSION; | |
4079 | ver.minor = MD_MINOR_VERSION; | |
4080 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4081 | ||
4082 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4083 | return -EFAULT; | |
4084 | ||
4085 | return 0; | |
4086 | } | |
4087 | ||
4088 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4089 | { | |
4090 | mdu_array_info_t info; | |
4091 | int nr,working,active,failed,spare; | |
4092 | mdk_rdev_t *rdev; | |
4093 | struct list_head *tmp; | |
4094 | ||
4095 | nr=working=active=failed=spare=0; | |
d089c6af | 4096 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 | 4097 | nr++; |
b2d444d7 | 4098 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4099 | failed++; |
4100 | else { | |
4101 | working++; | |
b2d444d7 | 4102 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4103 | active++; |
4104 | else | |
4105 | spare++; | |
4106 | } | |
4107 | } | |
4108 | ||
4109 | info.major_version = mddev->major_version; | |
4110 | info.minor_version = mddev->minor_version; | |
4111 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4112 | info.ctime = mddev->ctime; | |
4113 | info.level = mddev->level; | |
4114 | info.size = mddev->size; | |
284ae7ca N |
4115 | if (info.size != mddev->size) /* overflow */ |
4116 | info.size = -1; | |
1da177e4 LT |
4117 | info.nr_disks = nr; |
4118 | info.raid_disks = mddev->raid_disks; | |
4119 | info.md_minor = mddev->md_minor; | |
4120 | info.not_persistent= !mddev->persistent; | |
4121 | ||
4122 | info.utime = mddev->utime; | |
4123 | info.state = 0; | |
4124 | if (mddev->in_sync) | |
4125 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4126 | if (mddev->bitmap && mddev->bitmap_offset) |
4127 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4128 | info.active_disks = active; |
4129 | info.working_disks = working; | |
4130 | info.failed_disks = failed; | |
4131 | info.spare_disks = spare; | |
4132 | ||
4133 | info.layout = mddev->layout; | |
4134 | info.chunk_size = mddev->chunk_size; | |
4135 | ||
4136 | if (copy_to_user(arg, &info, sizeof(info))) | |
4137 | return -EFAULT; | |
4138 | ||
4139 | return 0; | |
4140 | } | |
4141 | ||
87162a28 | 4142 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4143 | { |
4144 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4145 | char *ptr, *buf = NULL; | |
4146 | int err = -ENOMEM; | |
4147 | ||
b5470dc5 DW |
4148 | if (md_allow_write(mddev)) |
4149 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4150 | else | |
4151 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4152 | |
32a7627c N |
4153 | if (!file) |
4154 | goto out; | |
4155 | ||
4156 | /* bitmap disabled, zero the first byte and copy out */ | |
4157 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4158 | file->pathname[0] = '\0'; | |
4159 | goto copy_out; | |
4160 | } | |
4161 | ||
4162 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4163 | if (!buf) | |
4164 | goto out; | |
4165 | ||
6bcfd601 CH |
4166 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4167 | if (IS_ERR(ptr)) | |
32a7627c N |
4168 | goto out; |
4169 | ||
4170 | strcpy(file->pathname, ptr); | |
4171 | ||
4172 | copy_out: | |
4173 | err = 0; | |
4174 | if (copy_to_user(arg, file, sizeof(*file))) | |
4175 | err = -EFAULT; | |
4176 | out: | |
4177 | kfree(buf); | |
4178 | kfree(file); | |
4179 | return err; | |
4180 | } | |
4181 | ||
1da177e4 LT |
4182 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4183 | { | |
4184 | mdu_disk_info_t info; | |
1da177e4 LT |
4185 | mdk_rdev_t *rdev; |
4186 | ||
4187 | if (copy_from_user(&info, arg, sizeof(info))) | |
4188 | return -EFAULT; | |
4189 | ||
26ef379f | 4190 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4191 | if (rdev) { |
4192 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4193 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4194 | info.raid_disk = rdev->raid_disk; | |
4195 | info.state = 0; | |
b2d444d7 | 4196 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4197 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4198 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4199 | info.state |= (1<<MD_DISK_ACTIVE); |
4200 | info.state |= (1<<MD_DISK_SYNC); | |
4201 | } | |
8ddf9efe N |
4202 | if (test_bit(WriteMostly, &rdev->flags)) |
4203 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4204 | } else { |
4205 | info.major = info.minor = 0; | |
4206 | info.raid_disk = -1; | |
4207 | info.state = (1<<MD_DISK_REMOVED); | |
4208 | } | |
4209 | ||
4210 | if (copy_to_user(arg, &info, sizeof(info))) | |
4211 | return -EFAULT; | |
4212 | ||
4213 | return 0; | |
4214 | } | |
4215 | ||
4216 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4217 | { | |
4218 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4219 | mdk_rdev_t *rdev; | |
4220 | dev_t dev = MKDEV(info->major,info->minor); | |
4221 | ||
4222 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4223 | return -EOVERFLOW; | |
4224 | ||
4225 | if (!mddev->raid_disks) { | |
4226 | int err; | |
4227 | /* expecting a device which has a superblock */ | |
4228 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4229 | if (IS_ERR(rdev)) { | |
4230 | printk(KERN_WARNING | |
4231 | "md: md_import_device returned %ld\n", | |
4232 | PTR_ERR(rdev)); | |
4233 | return PTR_ERR(rdev); | |
4234 | } | |
4235 | if (!list_empty(&mddev->disks)) { | |
4236 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4237 | mdk_rdev_t, same_set); | |
4238 | int err = super_types[mddev->major_version] | |
4239 | .load_super(rdev, rdev0, mddev->minor_version); | |
4240 | if (err < 0) { | |
4241 | printk(KERN_WARNING | |
4242 | "md: %s has different UUID to %s\n", | |
4243 | bdevname(rdev->bdev,b), | |
4244 | bdevname(rdev0->bdev,b2)); | |
4245 | export_rdev(rdev); | |
4246 | return -EINVAL; | |
4247 | } | |
4248 | } | |
4249 | err = bind_rdev_to_array(rdev, mddev); | |
4250 | if (err) | |
4251 | export_rdev(rdev); | |
4252 | return err; | |
4253 | } | |
4254 | ||
4255 | /* | |
4256 | * add_new_disk can be used once the array is assembled | |
4257 | * to add "hot spares". They must already have a superblock | |
4258 | * written | |
4259 | */ | |
4260 | if (mddev->pers) { | |
4261 | int err; | |
4262 | if (!mddev->pers->hot_add_disk) { | |
4263 | printk(KERN_WARNING | |
4264 | "%s: personality does not support diskops!\n", | |
4265 | mdname(mddev)); | |
4266 | return -EINVAL; | |
4267 | } | |
7b1e35f6 N |
4268 | if (mddev->persistent) |
4269 | rdev = md_import_device(dev, mddev->major_version, | |
4270 | mddev->minor_version); | |
4271 | else | |
4272 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4273 | if (IS_ERR(rdev)) { |
4274 | printk(KERN_WARNING | |
4275 | "md: md_import_device returned %ld\n", | |
4276 | PTR_ERR(rdev)); | |
4277 | return PTR_ERR(rdev); | |
4278 | } | |
41158c7e N |
4279 | /* set save_raid_disk if appropriate */ |
4280 | if (!mddev->persistent) { | |
4281 | if (info->state & (1<<MD_DISK_SYNC) && | |
4282 | info->raid_disk < mddev->raid_disks) | |
4283 | rdev->raid_disk = info->raid_disk; | |
4284 | else | |
4285 | rdev->raid_disk = -1; | |
4286 | } else | |
4287 | super_types[mddev->major_version]. | |
4288 | validate_super(mddev, rdev); | |
4289 | rdev->saved_raid_disk = rdev->raid_disk; | |
4290 | ||
b2d444d7 | 4291 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4292 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4293 | set_bit(WriteMostly, &rdev->flags); | |
4294 | ||
1da177e4 LT |
4295 | rdev->raid_disk = -1; |
4296 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4297 | if (!err && !mddev->pers->hot_remove_disk) { |
4298 | /* If there is hot_add_disk but no hot_remove_disk | |
4299 | * then added disks for geometry changes, | |
4300 | * and should be added immediately. | |
4301 | */ | |
4302 | super_types[mddev->major_version]. | |
4303 | validate_super(mddev, rdev); | |
4304 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4305 | if (err) | |
4306 | unbind_rdev_from_array(rdev); | |
4307 | } | |
1da177e4 LT |
4308 | if (err) |
4309 | export_rdev(rdev); | |
52664732 NB |
4310 | else |
4311 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
c361777f | 4312 | |
17571284 | 4313 | md_update_sb(mddev, 1); |
72a23c21 NB |
4314 | if (mddev->degraded) |
4315 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4316 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4317 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4318 | return err; |
4319 | } | |
4320 | ||
4321 | /* otherwise, add_new_disk is only allowed | |
4322 | * for major_version==0 superblocks | |
4323 | */ | |
4324 | if (mddev->major_version != 0) { | |
4325 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4326 | mdname(mddev)); | |
4327 | return -EINVAL; | |
4328 | } | |
4329 | ||
4330 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4331 | int err; | |
4332 | rdev = md_import_device (dev, -1, 0); | |
4333 | if (IS_ERR(rdev)) { | |
4334 | printk(KERN_WARNING | |
4335 | "md: error, md_import_device() returned %ld\n", | |
4336 | PTR_ERR(rdev)); | |
4337 | return PTR_ERR(rdev); | |
4338 | } | |
4339 | rdev->desc_nr = info->number; | |
4340 | if (info->raid_disk < mddev->raid_disks) | |
4341 | rdev->raid_disk = info->raid_disk; | |
4342 | else | |
4343 | rdev->raid_disk = -1; | |
4344 | ||
1da177e4 | 4345 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4346 | if (info->state & (1<<MD_DISK_SYNC)) |
4347 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4348 | |
8ddf9efe N |
4349 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4350 | set_bit(WriteMostly, &rdev->flags); | |
4351 | ||
1da177e4 LT |
4352 | if (!mddev->persistent) { |
4353 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4354 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4355 | } else |
0f420358 | 4356 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
e7debaa4 | 4357 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4358 | |
2bf071bf N |
4359 | err = bind_rdev_to_array(rdev, mddev); |
4360 | if (err) { | |
4361 | export_rdev(rdev); | |
4362 | return err; | |
4363 | } | |
1da177e4 LT |
4364 | } |
4365 | ||
4366 | return 0; | |
4367 | } | |
4368 | ||
4369 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4370 | { | |
4371 | char b[BDEVNAME_SIZE]; | |
4372 | mdk_rdev_t *rdev; | |
4373 | ||
1da177e4 LT |
4374 | rdev = find_rdev(mddev, dev); |
4375 | if (!rdev) | |
4376 | return -ENXIO; | |
4377 | ||
4378 | if (rdev->raid_disk >= 0) | |
4379 | goto busy; | |
4380 | ||
4381 | kick_rdev_from_array(rdev); | |
850b2b42 | 4382 | md_update_sb(mddev, 1); |
d7603b7e | 4383 | md_new_event(mddev); |
1da177e4 LT |
4384 | |
4385 | return 0; | |
4386 | busy: | |
fdefa4d8 | 4387 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4388 | bdevname(rdev->bdev,b), mdname(mddev)); |
4389 | return -EBUSY; | |
4390 | } | |
4391 | ||
4392 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4393 | { | |
4394 | char b[BDEVNAME_SIZE]; | |
4395 | int err; | |
1da177e4 LT |
4396 | mdk_rdev_t *rdev; |
4397 | ||
4398 | if (!mddev->pers) | |
4399 | return -ENODEV; | |
4400 | ||
4401 | if (mddev->major_version != 0) { | |
4402 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4403 | " version-0 superblocks.\n", | |
4404 | mdname(mddev)); | |
4405 | return -EINVAL; | |
4406 | } | |
4407 | if (!mddev->pers->hot_add_disk) { | |
4408 | printk(KERN_WARNING | |
4409 | "%s: personality does not support diskops!\n", | |
4410 | mdname(mddev)); | |
4411 | return -EINVAL; | |
4412 | } | |
4413 | ||
4414 | rdev = md_import_device (dev, -1, 0); | |
4415 | if (IS_ERR(rdev)) { | |
4416 | printk(KERN_WARNING | |
4417 | "md: error, md_import_device() returned %ld\n", | |
4418 | PTR_ERR(rdev)); | |
4419 | return -EINVAL; | |
4420 | } | |
4421 | ||
4422 | if (mddev->persistent) | |
0f420358 | 4423 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4424 | else |
0f420358 | 4425 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4426 | |
e7debaa4 | 4427 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4428 | |
b2d444d7 | 4429 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4430 | printk(KERN_WARNING |
4431 | "md: can not hot-add faulty %s disk to %s!\n", | |
4432 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4433 | err = -EINVAL; | |
4434 | goto abort_export; | |
4435 | } | |
b2d444d7 | 4436 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4437 | rdev->desc_nr = -1; |
5842730d | 4438 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4439 | err = bind_rdev_to_array(rdev, mddev); |
4440 | if (err) | |
4441 | goto abort_export; | |
1da177e4 LT |
4442 | |
4443 | /* | |
4444 | * The rest should better be atomic, we can have disk failures | |
4445 | * noticed in interrupt contexts ... | |
4446 | */ | |
4447 | ||
4448 | if (rdev->desc_nr == mddev->max_disks) { | |
4449 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4450 | mdname(mddev)); | |
4451 | err = -EBUSY; | |
4452 | goto abort_unbind_export; | |
4453 | } | |
4454 | ||
4455 | rdev->raid_disk = -1; | |
4456 | ||
850b2b42 | 4457 | md_update_sb(mddev, 1); |
1da177e4 LT |
4458 | |
4459 | /* | |
4460 | * Kick recovery, maybe this spare has to be added to the | |
4461 | * array immediately. | |
4462 | */ | |
4463 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4464 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4465 | md_new_event(mddev); |
1da177e4 LT |
4466 | return 0; |
4467 | ||
4468 | abort_unbind_export: | |
4469 | unbind_rdev_from_array(rdev); | |
4470 | ||
4471 | abort_export: | |
4472 | export_rdev(rdev); | |
4473 | return err; | |
4474 | } | |
4475 | ||
32a7627c N |
4476 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4477 | { | |
4478 | int err; | |
4479 | ||
36fa3063 N |
4480 | if (mddev->pers) { |
4481 | if (!mddev->pers->quiesce) | |
4482 | return -EBUSY; | |
4483 | if (mddev->recovery || mddev->sync_thread) | |
4484 | return -EBUSY; | |
4485 | /* we should be able to change the bitmap.. */ | |
4486 | } | |
32a7627c | 4487 | |
32a7627c | 4488 | |
36fa3063 N |
4489 | if (fd >= 0) { |
4490 | if (mddev->bitmap) | |
4491 | return -EEXIST; /* cannot add when bitmap is present */ | |
4492 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4493 | |
36fa3063 N |
4494 | if (mddev->bitmap_file == NULL) { |
4495 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4496 | mdname(mddev)); | |
4497 | return -EBADF; | |
4498 | } | |
4499 | ||
4500 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4501 | if (err) { | |
4502 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4503 | mdname(mddev)); | |
4504 | fput(mddev->bitmap_file); | |
4505 | mddev->bitmap_file = NULL; | |
4506 | return err; | |
4507 | } | |
a654b9d8 | 4508 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4509 | } else if (mddev->bitmap == NULL) |
4510 | return -ENOENT; /* cannot remove what isn't there */ | |
4511 | err = 0; | |
4512 | if (mddev->pers) { | |
4513 | mddev->pers->quiesce(mddev, 1); | |
4514 | if (fd >= 0) | |
4515 | err = bitmap_create(mddev); | |
d7375ab3 | 4516 | if (fd < 0 || err) { |
36fa3063 | 4517 | bitmap_destroy(mddev); |
d7375ab3 N |
4518 | fd = -1; /* make sure to put the file */ |
4519 | } | |
36fa3063 | 4520 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4521 | } |
4522 | if (fd < 0) { | |
acc55e22 N |
4523 | if (mddev->bitmap_file) { |
4524 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4525 | fput(mddev->bitmap_file); |
acc55e22 | 4526 | } |
36fa3063 N |
4527 | mddev->bitmap_file = NULL; |
4528 | } | |
4529 | ||
32a7627c N |
4530 | return err; |
4531 | } | |
4532 | ||
1da177e4 LT |
4533 | /* |
4534 | * set_array_info is used two different ways | |
4535 | * The original usage is when creating a new array. | |
4536 | * In this usage, raid_disks is > 0 and it together with | |
4537 | * level, size, not_persistent,layout,chunksize determine the | |
4538 | * shape of the array. | |
4539 | * This will always create an array with a type-0.90.0 superblock. | |
4540 | * The newer usage is when assembling an array. | |
4541 | * In this case raid_disks will be 0, and the major_version field is | |
4542 | * use to determine which style super-blocks are to be found on the devices. | |
4543 | * The minor and patch _version numbers are also kept incase the | |
4544 | * super_block handler wishes to interpret them. | |
4545 | */ | |
4546 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4547 | { | |
4548 | ||
4549 | if (info->raid_disks == 0) { | |
4550 | /* just setting version number for superblock loading */ | |
4551 | if (info->major_version < 0 || | |
50511da3 | 4552 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4553 | super_types[info->major_version].name == NULL) { |
4554 | /* maybe try to auto-load a module? */ | |
4555 | printk(KERN_INFO | |
4556 | "md: superblock version %d not known\n", | |
4557 | info->major_version); | |
4558 | return -EINVAL; | |
4559 | } | |
4560 | mddev->major_version = info->major_version; | |
4561 | mddev->minor_version = info->minor_version; | |
4562 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4563 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4564 | return 0; |
4565 | } | |
4566 | mddev->major_version = MD_MAJOR_VERSION; | |
4567 | mddev->minor_version = MD_MINOR_VERSION; | |
4568 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4569 | mddev->ctime = get_seconds(); | |
4570 | ||
4571 | mddev->level = info->level; | |
17115e03 | 4572 | mddev->clevel[0] = 0; |
1da177e4 LT |
4573 | mddev->size = info->size; |
4574 | mddev->raid_disks = info->raid_disks; | |
4575 | /* don't set md_minor, it is determined by which /dev/md* was | |
4576 | * openned | |
4577 | */ | |
4578 | if (info->state & (1<<MD_SB_CLEAN)) | |
4579 | mddev->recovery_cp = MaxSector; | |
4580 | else | |
4581 | mddev->recovery_cp = 0; | |
4582 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4583 | mddev->external = 0; |
1da177e4 LT |
4584 | |
4585 | mddev->layout = info->layout; | |
4586 | mddev->chunk_size = info->chunk_size; | |
4587 | ||
4588 | mddev->max_disks = MD_SB_DISKS; | |
4589 | ||
e691063a N |
4590 | if (mddev->persistent) |
4591 | mddev->flags = 0; | |
850b2b42 | 4592 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4593 | |
b2a2703c N |
4594 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4595 | mddev->bitmap_offset = 0; | |
4596 | ||
f6705578 N |
4597 | mddev->reshape_position = MaxSector; |
4598 | ||
1da177e4 LT |
4599 | /* |
4600 | * Generate a 128 bit UUID | |
4601 | */ | |
4602 | get_random_bytes(mddev->uuid, 16); | |
4603 | ||
f6705578 N |
4604 | mddev->new_level = mddev->level; |
4605 | mddev->new_chunk = mddev->chunk_size; | |
4606 | mddev->new_layout = mddev->layout; | |
4607 | mddev->delta_disks = 0; | |
4608 | ||
1da177e4 LT |
4609 | return 0; |
4610 | } | |
4611 | ||
d71f9f88 | 4612 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 N |
4613 | { |
4614 | mdk_rdev_t * rdev; | |
4615 | int rv; | |
4616 | struct list_head *tmp; | |
d71f9f88 | 4617 | int fit = (num_sectors == 0); |
a35b0d69 N |
4618 | |
4619 | if (mddev->pers->resize == NULL) | |
4620 | return -EINVAL; | |
d71f9f88 AN |
4621 | /* The "num_sectors" is the number of sectors of each device that |
4622 | * is used. This can only make sense for arrays with redundancy. | |
4623 | * linear and raid0 always use whatever space is available. We can only | |
4624 | * consider changing this number if no resync or reconstruction is | |
4625 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 4626 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
4627 | * of each device. If num_sectors is zero, we find the largest size |
4628 | * that fits. | |
4629 | ||
a35b0d69 N |
4630 | */ |
4631 | if (mddev->sync_thread) | |
4632 | return -EBUSY; | |
d089c6af | 4633 | rdev_for_each(rdev, tmp, mddev) { |
a35b0d69 | 4634 | sector_t avail; |
01ab5662 N |
4635 | avail = rdev->size * 2; |
4636 | ||
d71f9f88 AN |
4637 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
4638 | num_sectors = avail; | |
4639 | if (avail < num_sectors) | |
a35b0d69 N |
4640 | return -ENOSPC; |
4641 | } | |
d71f9f88 | 4642 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
4643 | if (!rv) { |
4644 | struct block_device *bdev; | |
4645 | ||
4646 | bdev = bdget_disk(mddev->gendisk, 0); | |
4647 | if (bdev) { | |
1b1dcc1b | 4648 | mutex_lock(&bdev->bd_inode->i_mutex); |
6d89332b | 4649 | i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10); |
1b1dcc1b | 4650 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4651 | bdput(bdev); |
4652 | } | |
4653 | } | |
4654 | return rv; | |
4655 | } | |
4656 | ||
da943b99 N |
4657 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4658 | { | |
4659 | int rv; | |
4660 | /* change the number of raid disks */ | |
63c70c4f | 4661 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4662 | return -EINVAL; |
4663 | if (raid_disks <= 0 || | |
4664 | raid_disks >= mddev->max_disks) | |
4665 | return -EINVAL; | |
63c70c4f | 4666 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4667 | return -EBUSY; |
63c70c4f N |
4668 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4669 | ||
4670 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4671 | return rv; |
4672 | } | |
4673 | ||
4674 | ||
1da177e4 LT |
4675 | /* |
4676 | * update_array_info is used to change the configuration of an | |
4677 | * on-line array. | |
4678 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4679 | * fields in the info are checked against the array. | |
4680 | * Any differences that cannot be handled will cause an error. | |
4681 | * Normally, only one change can be managed at a time. | |
4682 | */ | |
4683 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4684 | { | |
4685 | int rv = 0; | |
4686 | int cnt = 0; | |
36fa3063 N |
4687 | int state = 0; |
4688 | ||
4689 | /* calculate expected state,ignoring low bits */ | |
4690 | if (mddev->bitmap && mddev->bitmap_offset) | |
4691 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4692 | |
4693 | if (mddev->major_version != info->major_version || | |
4694 | mddev->minor_version != info->minor_version || | |
4695 | /* mddev->patch_version != info->patch_version || */ | |
4696 | mddev->ctime != info->ctime || | |
4697 | mddev->level != info->level || | |
4698 | /* mddev->layout != info->layout || */ | |
4699 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4700 | mddev->chunk_size != info->chunk_size || |
4701 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4702 | ((state^info->state) & 0xfffffe00) | |
4703 | ) | |
1da177e4 LT |
4704 | return -EINVAL; |
4705 | /* Check there is only one change */ | |
284ae7ca | 4706 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4707 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4708 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4709 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4710 | if (cnt == 0) return 0; |
4711 | if (cnt > 1) return -EINVAL; | |
4712 | ||
4713 | if (mddev->layout != info->layout) { | |
4714 | /* Change layout | |
4715 | * we don't need to do anything at the md level, the | |
4716 | * personality will take care of it all. | |
4717 | */ | |
4718 | if (mddev->pers->reconfig == NULL) | |
4719 | return -EINVAL; | |
4720 | else | |
4721 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4722 | } | |
284ae7ca | 4723 | if (info->size >= 0 && mddev->size != info->size) |
d71f9f88 | 4724 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 4725 | |
da943b99 N |
4726 | if (mddev->raid_disks != info->raid_disks) |
4727 | rv = update_raid_disks(mddev, info->raid_disks); | |
4728 | ||
36fa3063 N |
4729 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4730 | if (mddev->pers->quiesce == NULL) | |
4731 | return -EINVAL; | |
4732 | if (mddev->recovery || mddev->sync_thread) | |
4733 | return -EBUSY; | |
4734 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4735 | /* add the bitmap */ | |
4736 | if (mddev->bitmap) | |
4737 | return -EEXIST; | |
4738 | if (mddev->default_bitmap_offset == 0) | |
4739 | return -EINVAL; | |
4740 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4741 | mddev->pers->quiesce(mddev, 1); | |
4742 | rv = bitmap_create(mddev); | |
4743 | if (rv) | |
4744 | bitmap_destroy(mddev); | |
4745 | mddev->pers->quiesce(mddev, 0); | |
4746 | } else { | |
4747 | /* remove the bitmap */ | |
4748 | if (!mddev->bitmap) | |
4749 | return -ENOENT; | |
4750 | if (mddev->bitmap->file) | |
4751 | return -EINVAL; | |
4752 | mddev->pers->quiesce(mddev, 1); | |
4753 | bitmap_destroy(mddev); | |
4754 | mddev->pers->quiesce(mddev, 0); | |
4755 | mddev->bitmap_offset = 0; | |
4756 | } | |
4757 | } | |
850b2b42 | 4758 | md_update_sb(mddev, 1); |
1da177e4 LT |
4759 | return rv; |
4760 | } | |
4761 | ||
4762 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4763 | { | |
4764 | mdk_rdev_t *rdev; | |
4765 | ||
4766 | if (mddev->pers == NULL) | |
4767 | return -ENODEV; | |
4768 | ||
4769 | rdev = find_rdev(mddev, dev); | |
4770 | if (!rdev) | |
4771 | return -ENODEV; | |
4772 | ||
4773 | md_error(mddev, rdev); | |
4774 | return 0; | |
4775 | } | |
4776 | ||
2f9618ce AN |
4777 | /* |
4778 | * We have a problem here : there is no easy way to give a CHS | |
4779 | * virtual geometry. We currently pretend that we have a 2 heads | |
4780 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4781 | * dosfs just mad... ;-) | |
4782 | */ | |
a885c8c4 CH |
4783 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4784 | { | |
4785 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4786 | ||
4787 | geo->heads = 2; | |
4788 | geo->sectors = 4; | |
4789 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4790 | return 0; | |
4791 | } | |
4792 | ||
1da177e4 LT |
4793 | static int md_ioctl(struct inode *inode, struct file *file, |
4794 | unsigned int cmd, unsigned long arg) | |
4795 | { | |
4796 | int err = 0; | |
4797 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4798 | mddev_t *mddev = NULL; |
4799 | ||
4800 | if (!capable(CAP_SYS_ADMIN)) | |
4801 | return -EACCES; | |
4802 | ||
4803 | /* | |
4804 | * Commands dealing with the RAID driver but not any | |
4805 | * particular array: | |
4806 | */ | |
4807 | switch (cmd) | |
4808 | { | |
4809 | case RAID_VERSION: | |
4810 | err = get_version(argp); | |
4811 | goto done; | |
4812 | ||
4813 | case PRINT_RAID_DEBUG: | |
4814 | err = 0; | |
4815 | md_print_devices(); | |
4816 | goto done; | |
4817 | ||
4818 | #ifndef MODULE | |
4819 | case RAID_AUTORUN: | |
4820 | err = 0; | |
4821 | autostart_arrays(arg); | |
4822 | goto done; | |
4823 | #endif | |
4824 | default:; | |
4825 | } | |
4826 | ||
4827 | /* | |
4828 | * Commands creating/starting a new array: | |
4829 | */ | |
4830 | ||
4831 | mddev = inode->i_bdev->bd_disk->private_data; | |
4832 | ||
4833 | if (!mddev) { | |
4834 | BUG(); | |
4835 | goto abort; | |
4836 | } | |
4837 | ||
1da177e4 LT |
4838 | err = mddev_lock(mddev); |
4839 | if (err) { | |
4840 | printk(KERN_INFO | |
4841 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4842 | err, cmd); | |
4843 | goto abort; | |
4844 | } | |
4845 | ||
4846 | switch (cmd) | |
4847 | { | |
4848 | case SET_ARRAY_INFO: | |
4849 | { | |
4850 | mdu_array_info_t info; | |
4851 | if (!arg) | |
4852 | memset(&info, 0, sizeof(info)); | |
4853 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4854 | err = -EFAULT; | |
4855 | goto abort_unlock; | |
4856 | } | |
4857 | if (mddev->pers) { | |
4858 | err = update_array_info(mddev, &info); | |
4859 | if (err) { | |
4860 | printk(KERN_WARNING "md: couldn't update" | |
4861 | " array info. %d\n", err); | |
4862 | goto abort_unlock; | |
4863 | } | |
4864 | goto done_unlock; | |
4865 | } | |
4866 | if (!list_empty(&mddev->disks)) { | |
4867 | printk(KERN_WARNING | |
4868 | "md: array %s already has disks!\n", | |
4869 | mdname(mddev)); | |
4870 | err = -EBUSY; | |
4871 | goto abort_unlock; | |
4872 | } | |
4873 | if (mddev->raid_disks) { | |
4874 | printk(KERN_WARNING | |
4875 | "md: array %s already initialised!\n", | |
4876 | mdname(mddev)); | |
4877 | err = -EBUSY; | |
4878 | goto abort_unlock; | |
4879 | } | |
4880 | err = set_array_info(mddev, &info); | |
4881 | if (err) { | |
4882 | printk(KERN_WARNING "md: couldn't set" | |
4883 | " array info. %d\n", err); | |
4884 | goto abort_unlock; | |
4885 | } | |
4886 | } | |
4887 | goto done_unlock; | |
4888 | ||
4889 | default:; | |
4890 | } | |
4891 | ||
4892 | /* | |
4893 | * Commands querying/configuring an existing array: | |
4894 | */ | |
32a7627c | 4895 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 4896 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
4897 | if ((!mddev->raid_disks && !mddev->external) |
4898 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
4899 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
4900 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
4901 | err = -ENODEV; |
4902 | goto abort_unlock; | |
4903 | } | |
4904 | ||
4905 | /* | |
4906 | * Commands even a read-only array can execute: | |
4907 | */ | |
4908 | switch (cmd) | |
4909 | { | |
4910 | case GET_ARRAY_INFO: | |
4911 | err = get_array_info(mddev, argp); | |
4912 | goto done_unlock; | |
4913 | ||
32a7627c | 4914 | case GET_BITMAP_FILE: |
87162a28 | 4915 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
4916 | goto done_unlock; |
4917 | ||
1da177e4 LT |
4918 | case GET_DISK_INFO: |
4919 | err = get_disk_info(mddev, argp); | |
4920 | goto done_unlock; | |
4921 | ||
4922 | case RESTART_ARRAY_RW: | |
4923 | err = restart_array(mddev); | |
4924 | goto done_unlock; | |
4925 | ||
4926 | case STOP_ARRAY: | |
df5b20cf | 4927 | err = do_md_stop (mddev, 0, 1); |
1da177e4 LT |
4928 | goto done_unlock; |
4929 | ||
4930 | case STOP_ARRAY_RO: | |
df5b20cf | 4931 | err = do_md_stop (mddev, 1, 1); |
1da177e4 LT |
4932 | goto done_unlock; |
4933 | ||
1da177e4 LT |
4934 | } |
4935 | ||
4936 | /* | |
4937 | * The remaining ioctls are changing the state of the | |
f91de92e N |
4938 | * superblock, so we do not allow them on read-only arrays. |
4939 | * However non-MD ioctls (e.g. get-size) will still come through | |
4940 | * here and hit the 'default' below, so only disallow | |
4941 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 4942 | */ |
bb57fc64 | 4943 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
4944 | if (mddev->ro == 2) { |
4945 | mddev->ro = 0; | |
0fd62b86 NB |
4946 | sysfs_notify(&mddev->kobj, NULL, "array_state"); |
4947 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4948 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
4949 | } else { |
4950 | err = -EROFS; | |
4951 | goto abort_unlock; | |
4952 | } | |
1da177e4 LT |
4953 | } |
4954 | ||
4955 | switch (cmd) | |
4956 | { | |
4957 | case ADD_NEW_DISK: | |
4958 | { | |
4959 | mdu_disk_info_t info; | |
4960 | if (copy_from_user(&info, argp, sizeof(info))) | |
4961 | err = -EFAULT; | |
4962 | else | |
4963 | err = add_new_disk(mddev, &info); | |
4964 | goto done_unlock; | |
4965 | } | |
4966 | ||
4967 | case HOT_REMOVE_DISK: | |
4968 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
4969 | goto done_unlock; | |
4970 | ||
4971 | case HOT_ADD_DISK: | |
4972 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
4973 | goto done_unlock; | |
4974 | ||
4975 | case SET_DISK_FAULTY: | |
4976 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
4977 | goto done_unlock; | |
4978 | ||
4979 | case RUN_ARRAY: | |
4980 | err = do_md_run (mddev); | |
4981 | goto done_unlock; | |
4982 | ||
32a7627c N |
4983 | case SET_BITMAP_FILE: |
4984 | err = set_bitmap_file(mddev, (int)arg); | |
4985 | goto done_unlock; | |
4986 | ||
1da177e4 | 4987 | default: |
1da177e4 LT |
4988 | err = -EINVAL; |
4989 | goto abort_unlock; | |
4990 | } | |
4991 | ||
4992 | done_unlock: | |
4993 | abort_unlock: | |
4994 | mddev_unlock(mddev); | |
4995 | ||
4996 | return err; | |
4997 | done: | |
4998 | if (err) | |
4999 | MD_BUG(); | |
5000 | abort: | |
5001 | return err; | |
5002 | } | |
5003 | ||
5004 | static int md_open(struct inode *inode, struct file *file) | |
5005 | { | |
5006 | /* | |
5007 | * Succeed if we can lock the mddev, which confirms that | |
5008 | * it isn't being stopped right now. | |
5009 | */ | |
5010 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
5011 | int err; | |
5012 | ||
d63a5a74 | 5013 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5014 | goto out; |
5015 | ||
5016 | err = 0; | |
5017 | mddev_get(mddev); | |
5018 | mddev_unlock(mddev); | |
5019 | ||
5020 | check_disk_change(inode->i_bdev); | |
5021 | out: | |
5022 | return err; | |
5023 | } | |
5024 | ||
5025 | static int md_release(struct inode *inode, struct file * file) | |
5026 | { | |
5027 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
5028 | ||
52e5f9d1 | 5029 | BUG_ON(!mddev); |
1da177e4 LT |
5030 | mddev_put(mddev); |
5031 | ||
5032 | return 0; | |
5033 | } | |
5034 | ||
44ce6294 LT |
5035 | static int md_media_changed(struct gendisk *disk) |
5036 | { | |
5037 | mddev_t *mddev = disk->private_data; | |
5038 | ||
5039 | return mddev->changed; | |
5040 | } | |
5041 | ||
5042 | static int md_revalidate(struct gendisk *disk) | |
5043 | { | |
5044 | mddev_t *mddev = disk->private_data; | |
5045 | ||
5046 | mddev->changed = 0; | |
5047 | return 0; | |
5048 | } | |
1da177e4 LT |
5049 | static struct block_device_operations md_fops = |
5050 | { | |
5051 | .owner = THIS_MODULE, | |
5052 | .open = md_open, | |
5053 | .release = md_release, | |
5054 | .ioctl = md_ioctl, | |
a885c8c4 | 5055 | .getgeo = md_getgeo, |
44ce6294 LT |
5056 | .media_changed = md_media_changed, |
5057 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5058 | }; |
5059 | ||
75c96f85 | 5060 | static int md_thread(void * arg) |
1da177e4 LT |
5061 | { |
5062 | mdk_thread_t *thread = arg; | |
5063 | ||
1da177e4 LT |
5064 | /* |
5065 | * md_thread is a 'system-thread', it's priority should be very | |
5066 | * high. We avoid resource deadlocks individually in each | |
5067 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5068 | * the very same RT priority as kswapd, thus we will never get | |
5069 | * into a priority inversion deadlock. | |
5070 | * | |
5071 | * we definitely have to have equal or higher priority than | |
5072 | * bdflush, otherwise bdflush will deadlock if there are too | |
5073 | * many dirty RAID5 blocks. | |
5074 | */ | |
1da177e4 | 5075 | |
6985c43f | 5076 | allow_signal(SIGKILL); |
a6fb0934 | 5077 | while (!kthread_should_stop()) { |
1da177e4 | 5078 | |
93588e22 N |
5079 | /* We need to wait INTERRUPTIBLE so that |
5080 | * we don't add to the load-average. | |
5081 | * That means we need to be sure no signals are | |
5082 | * pending | |
5083 | */ | |
5084 | if (signal_pending(current)) | |
5085 | flush_signals(current); | |
5086 | ||
5087 | wait_event_interruptible_timeout | |
5088 | (thread->wqueue, | |
5089 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5090 | || kthread_should_stop(), | |
5091 | thread->timeout); | |
1da177e4 LT |
5092 | |
5093 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5094 | ||
787453c2 | 5095 | thread->run(thread->mddev); |
1da177e4 | 5096 | } |
a6fb0934 | 5097 | |
1da177e4 LT |
5098 | return 0; |
5099 | } | |
5100 | ||
5101 | void md_wakeup_thread(mdk_thread_t *thread) | |
5102 | { | |
5103 | if (thread) { | |
5104 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5105 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5106 | wake_up(&thread->wqueue); | |
5107 | } | |
5108 | } | |
5109 | ||
5110 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5111 | const char *name) | |
5112 | { | |
5113 | mdk_thread_t *thread; | |
1da177e4 | 5114 | |
9ffae0cf | 5115 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5116 | if (!thread) |
5117 | return NULL; | |
5118 | ||
1da177e4 LT |
5119 | init_waitqueue_head(&thread->wqueue); |
5120 | ||
1da177e4 LT |
5121 | thread->run = run; |
5122 | thread->mddev = mddev; | |
32a7627c | 5123 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5124 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5125 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5126 | kfree(thread); |
5127 | return NULL; | |
5128 | } | |
1da177e4 LT |
5129 | return thread; |
5130 | } | |
5131 | ||
1da177e4 LT |
5132 | void md_unregister_thread(mdk_thread_t *thread) |
5133 | { | |
ba25f9dc | 5134 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5135 | |
5136 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5137 | kfree(thread); |
5138 | } | |
5139 | ||
5140 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5141 | { | |
5142 | if (!mddev) { | |
5143 | MD_BUG(); | |
5144 | return; | |
5145 | } | |
5146 | ||
b2d444d7 | 5147 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5148 | return; |
6bfe0b49 DW |
5149 | |
5150 | if (mddev->external) | |
5151 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5152 | /* |
1da177e4 LT |
5153 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5154 | mdname(mddev), | |
5155 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5156 | __builtin_return_address(0),__builtin_return_address(1), | |
5157 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5158 | */ |
d0a0a5ee AM |
5159 | if (!mddev->pers) |
5160 | return; | |
1da177e4 LT |
5161 | if (!mddev->pers->error_handler) |
5162 | return; | |
5163 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5164 | if (mddev->degraded) |
5165 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5166 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5167 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5168 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5169 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5170 | md_new_event_inintr(mddev); |
1da177e4 LT |
5171 | } |
5172 | ||
5173 | /* seq_file implementation /proc/mdstat */ | |
5174 | ||
5175 | static void status_unused(struct seq_file *seq) | |
5176 | { | |
5177 | int i = 0; | |
5178 | mdk_rdev_t *rdev; | |
5179 | struct list_head *tmp; | |
5180 | ||
5181 | seq_printf(seq, "unused devices: "); | |
5182 | ||
73c34431 | 5183 | rdev_for_each_list(rdev, tmp, pending_raid_disks) { |
1da177e4 LT |
5184 | char b[BDEVNAME_SIZE]; |
5185 | i++; | |
5186 | seq_printf(seq, "%s ", | |
5187 | bdevname(rdev->bdev,b)); | |
5188 | } | |
5189 | if (!i) | |
5190 | seq_printf(seq, "<none>"); | |
5191 | ||
5192 | seq_printf(seq, "\n"); | |
5193 | } | |
5194 | ||
5195 | ||
5196 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5197 | { | |
4588b42e N |
5198 | sector_t max_blocks, resync, res; |
5199 | unsigned long dt, db, rt; | |
5200 | int scale; | |
5201 | unsigned int per_milli; | |
1da177e4 LT |
5202 | |
5203 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
5204 | ||
5205 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5206 | max_blocks = mddev->resync_max_sectors >> 1; | |
5207 | else | |
5208 | max_blocks = mddev->size; | |
5209 | ||
5210 | /* | |
5211 | * Should not happen. | |
5212 | */ | |
5213 | if (!max_blocks) { | |
5214 | MD_BUG(); | |
5215 | return; | |
5216 | } | |
4588b42e N |
5217 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
5218 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
5219 | * u32, as those are the requirements for sector_div. | |
5220 | * Thus 'scale' must be at least 10 | |
5221 | */ | |
5222 | scale = 10; | |
5223 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5224 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
5225 | scale++; | |
5226 | } | |
5227 | res = (resync>>scale)*1000; | |
5228 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
5229 | ||
5230 | per_milli = res; | |
1da177e4 | 5231 | { |
4588b42e | 5232 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5233 | seq_printf(seq, "["); |
5234 | for (i = 0; i < x; i++) | |
5235 | seq_printf(seq, "="); | |
5236 | seq_printf(seq, ">"); | |
5237 | for (i = 0; i < y; i++) | |
5238 | seq_printf(seq, "."); | |
5239 | seq_printf(seq, "] "); | |
5240 | } | |
4588b42e | 5241 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5242 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5243 | "reshape" : | |
61df9d91 N |
5244 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5245 | "check" : | |
5246 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5247 | "resync" : "recovery"))), | |
5248 | per_milli/10, per_milli % 10, | |
4588b42e N |
5249 | (unsigned long long) resync, |
5250 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5251 | |
5252 | /* | |
5253 | * We do not want to overflow, so the order of operands and | |
5254 | * the * 100 / 100 trick are important. We do a +1 to be | |
5255 | * safe against division by zero. We only estimate anyway. | |
5256 | * | |
5257 | * dt: time from mark until now | |
5258 | * db: blocks written from mark until now | |
5259 | * rt: remaining time | |
5260 | */ | |
5261 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5262 | if (!dt) dt++; | |
ff4e8d9a N |
5263 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5264 | - mddev->resync_mark_cnt; | |
5265 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5266 | |
5267 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5268 | ||
ff4e8d9a | 5269 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5270 | } |
5271 | ||
5272 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5273 | { | |
5274 | struct list_head *tmp; | |
5275 | loff_t l = *pos; | |
5276 | mddev_t *mddev; | |
5277 | ||
5278 | if (l >= 0x10000) | |
5279 | return NULL; | |
5280 | if (!l--) | |
5281 | /* header */ | |
5282 | return (void*)1; | |
5283 | ||
5284 | spin_lock(&all_mddevs_lock); | |
5285 | list_for_each(tmp,&all_mddevs) | |
5286 | if (!l--) { | |
5287 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5288 | mddev_get(mddev); | |
5289 | spin_unlock(&all_mddevs_lock); | |
5290 | return mddev; | |
5291 | } | |
5292 | spin_unlock(&all_mddevs_lock); | |
5293 | if (!l--) | |
5294 | return (void*)2;/* tail */ | |
5295 | return NULL; | |
5296 | } | |
5297 | ||
5298 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5299 | { | |
5300 | struct list_head *tmp; | |
5301 | mddev_t *next_mddev, *mddev = v; | |
5302 | ||
5303 | ++*pos; | |
5304 | if (v == (void*)2) | |
5305 | return NULL; | |
5306 | ||
5307 | spin_lock(&all_mddevs_lock); | |
5308 | if (v == (void*)1) | |
5309 | tmp = all_mddevs.next; | |
5310 | else | |
5311 | tmp = mddev->all_mddevs.next; | |
5312 | if (tmp != &all_mddevs) | |
5313 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5314 | else { | |
5315 | next_mddev = (void*)2; | |
5316 | *pos = 0x10000; | |
5317 | } | |
5318 | spin_unlock(&all_mddevs_lock); | |
5319 | ||
5320 | if (v != (void*)1) | |
5321 | mddev_put(mddev); | |
5322 | return next_mddev; | |
5323 | ||
5324 | } | |
5325 | ||
5326 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5327 | { | |
5328 | mddev_t *mddev = v; | |
5329 | ||
5330 | if (mddev && v != (void*)1 && v != (void*)2) | |
5331 | mddev_put(mddev); | |
5332 | } | |
5333 | ||
d7603b7e N |
5334 | struct mdstat_info { |
5335 | int event; | |
5336 | }; | |
5337 | ||
1da177e4 LT |
5338 | static int md_seq_show(struct seq_file *seq, void *v) |
5339 | { | |
5340 | mddev_t *mddev = v; | |
5341 | sector_t size; | |
5342 | struct list_head *tmp2; | |
5343 | mdk_rdev_t *rdev; | |
d7603b7e | 5344 | struct mdstat_info *mi = seq->private; |
32a7627c | 5345 | struct bitmap *bitmap; |
1da177e4 LT |
5346 | |
5347 | if (v == (void*)1) { | |
2604b703 | 5348 | struct mdk_personality *pers; |
1da177e4 LT |
5349 | seq_printf(seq, "Personalities : "); |
5350 | spin_lock(&pers_lock); | |
2604b703 N |
5351 | list_for_each_entry(pers, &pers_list, list) |
5352 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5353 | |
5354 | spin_unlock(&pers_lock); | |
5355 | seq_printf(seq, "\n"); | |
d7603b7e | 5356 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5357 | return 0; |
5358 | } | |
5359 | if (v == (void*)2) { | |
5360 | status_unused(seq); | |
5361 | return 0; | |
5362 | } | |
5363 | ||
5dc5cf7d | 5364 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5365 | return -EINTR; |
5dc5cf7d | 5366 | |
1da177e4 LT |
5367 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5368 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5369 | mddev->pers ? "" : "in"); | |
5370 | if (mddev->pers) { | |
f91de92e | 5371 | if (mddev->ro==1) |
1da177e4 | 5372 | seq_printf(seq, " (read-only)"); |
f91de92e | 5373 | if (mddev->ro==2) |
52720ae7 | 5374 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5375 | seq_printf(seq, " %s", mddev->pers->name); |
5376 | } | |
5377 | ||
5378 | size = 0; | |
d089c6af | 5379 | rdev_for_each(rdev, tmp2, mddev) { |
1da177e4 LT |
5380 | char b[BDEVNAME_SIZE]; |
5381 | seq_printf(seq, " %s[%d]", | |
5382 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5383 | if (test_bit(WriteMostly, &rdev->flags)) |
5384 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5385 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5386 | seq_printf(seq, "(F)"); |
5387 | continue; | |
b325a32e N |
5388 | } else if (rdev->raid_disk < 0) |
5389 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
5390 | size += rdev->size; |
5391 | } | |
5392 | ||
5393 | if (!list_empty(&mddev->disks)) { | |
5394 | if (mddev->pers) | |
5395 | seq_printf(seq, "\n %llu blocks", | |
5396 | (unsigned long long)mddev->array_size); | |
5397 | else | |
5398 | seq_printf(seq, "\n %llu blocks", | |
5399 | (unsigned long long)size); | |
5400 | } | |
1cd6bf19 N |
5401 | if (mddev->persistent) { |
5402 | if (mddev->major_version != 0 || | |
5403 | mddev->minor_version != 90) { | |
5404 | seq_printf(seq," super %d.%d", | |
5405 | mddev->major_version, | |
5406 | mddev->minor_version); | |
5407 | } | |
e691063a N |
5408 | } else if (mddev->external) |
5409 | seq_printf(seq, " super external:%s", | |
5410 | mddev->metadata_type); | |
5411 | else | |
1cd6bf19 | 5412 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5413 | |
5414 | if (mddev->pers) { | |
5415 | mddev->pers->status (seq, mddev); | |
5416 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
5417 | if (mddev->pers->sync_request) { |
5418 | if (mddev->curr_resync > 2) { | |
5419 | status_resync (seq, mddev); | |
5420 | seq_printf(seq, "\n "); | |
5421 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5422 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5423 | else if (mddev->recovery_cp < MaxSector) | |
5424 | seq_printf(seq, "\tresync=PENDING\n "); | |
5425 | } | |
32a7627c N |
5426 | } else |
5427 | seq_printf(seq, "\n "); | |
5428 | ||
5429 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5430 | unsigned long chunk_kb; |
5431 | unsigned long flags; | |
32a7627c N |
5432 | spin_lock_irqsave(&bitmap->lock, flags); |
5433 | chunk_kb = bitmap->chunksize >> 10; | |
5434 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5435 | "%lu%s chunk", | |
5436 | bitmap->pages - bitmap->missing_pages, | |
5437 | bitmap->pages, | |
5438 | (bitmap->pages - bitmap->missing_pages) | |
5439 | << (PAGE_SHIFT - 10), | |
5440 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5441 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5442 | if (bitmap->file) { |
5443 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5444 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5445 | } |
78d742d8 | 5446 | |
32a7627c N |
5447 | seq_printf(seq, "\n"); |
5448 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5449 | } |
5450 | ||
5451 | seq_printf(seq, "\n"); | |
5452 | } | |
5453 | mddev_unlock(mddev); | |
5454 | ||
5455 | return 0; | |
5456 | } | |
5457 | ||
5458 | static struct seq_operations md_seq_ops = { | |
5459 | .start = md_seq_start, | |
5460 | .next = md_seq_next, | |
5461 | .stop = md_seq_stop, | |
5462 | .show = md_seq_show, | |
5463 | }; | |
5464 | ||
5465 | static int md_seq_open(struct inode *inode, struct file *file) | |
5466 | { | |
5467 | int error; | |
d7603b7e N |
5468 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5469 | if (mi == NULL) | |
5470 | return -ENOMEM; | |
1da177e4 LT |
5471 | |
5472 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5473 | if (error) |
5474 | kfree(mi); | |
5475 | else { | |
5476 | struct seq_file *p = file->private_data; | |
5477 | p->private = mi; | |
5478 | mi->event = atomic_read(&md_event_count); | |
5479 | } | |
1da177e4 LT |
5480 | return error; |
5481 | } | |
5482 | ||
d7603b7e N |
5483 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5484 | { | |
5485 | struct seq_file *m = filp->private_data; | |
5486 | struct mdstat_info *mi = m->private; | |
5487 | int mask; | |
5488 | ||
5489 | poll_wait(filp, &md_event_waiters, wait); | |
5490 | ||
5491 | /* always allow read */ | |
5492 | mask = POLLIN | POLLRDNORM; | |
5493 | ||
5494 | if (mi->event != atomic_read(&md_event_count)) | |
5495 | mask |= POLLERR | POLLPRI; | |
5496 | return mask; | |
5497 | } | |
5498 | ||
fa027c2a | 5499 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5500 | .owner = THIS_MODULE, |
1da177e4 LT |
5501 | .open = md_seq_open, |
5502 | .read = seq_read, | |
5503 | .llseek = seq_lseek, | |
c3f94b40 | 5504 | .release = seq_release_private, |
d7603b7e | 5505 | .poll = mdstat_poll, |
1da177e4 LT |
5506 | }; |
5507 | ||
2604b703 | 5508 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5509 | { |
1da177e4 | 5510 | spin_lock(&pers_lock); |
2604b703 N |
5511 | list_add_tail(&p->list, &pers_list); |
5512 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5513 | spin_unlock(&pers_lock); |
5514 | return 0; | |
5515 | } | |
5516 | ||
2604b703 | 5517 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5518 | { |
2604b703 | 5519 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5520 | spin_lock(&pers_lock); |
2604b703 | 5521 | list_del_init(&p->list); |
1da177e4 LT |
5522 | spin_unlock(&pers_lock); |
5523 | return 0; | |
5524 | } | |
5525 | ||
5526 | static int is_mddev_idle(mddev_t *mddev) | |
5527 | { | |
5528 | mdk_rdev_t * rdev; | |
5529 | struct list_head *tmp; | |
5530 | int idle; | |
713f6ab1 | 5531 | long curr_events; |
1da177e4 LT |
5532 | |
5533 | idle = 1; | |
d089c6af | 5534 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 | 5535 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
a362357b JA |
5536 | curr_events = disk_stat_read(disk, sectors[0]) + |
5537 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 5538 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5539 | /* sync IO will cause sync_io to increase before the disk_stats |
5540 | * as sync_io is counted when a request starts, and | |
5541 | * disk_stats is counted when it completes. | |
5542 | * So resync activity will cause curr_events to be smaller than | |
5543 | * when there was no such activity. | |
5544 | * non-sync IO will cause disk_stat to increase without | |
5545 | * increasing sync_io so curr_events will (eventually) | |
5546 | * be larger than it was before. Once it becomes | |
5547 | * substantially larger, the test below will cause | |
5548 | * the array to appear non-idle, and resync will slow | |
5549 | * down. | |
5550 | * If there is a lot of outstanding resync activity when | |
5551 | * we set last_event to curr_events, then all that activity | |
5552 | * completing might cause the array to appear non-idle | |
5553 | * and resync will be slowed down even though there might | |
5554 | * not have been non-resync activity. This will only | |
5555 | * happen once though. 'last_events' will soon reflect | |
5556 | * the state where there is little or no outstanding | |
5557 | * resync requests, and further resync activity will | |
5558 | * always make curr_events less than last_events. | |
c0e48521 | 5559 | * |
1da177e4 | 5560 | */ |
713f6ab1 | 5561 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5562 | rdev->last_events = curr_events; |
5563 | idle = 0; | |
5564 | } | |
5565 | } | |
5566 | return idle; | |
5567 | } | |
5568 | ||
5569 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5570 | { | |
5571 | /* another "blocks" (512byte) blocks have been synced */ | |
5572 | atomic_sub(blocks, &mddev->recovery_active); | |
5573 | wake_up(&mddev->recovery_wait); | |
5574 | if (!ok) { | |
dfc70645 | 5575 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5576 | md_wakeup_thread(mddev->thread); |
5577 | // stop recovery, signal do_sync .... | |
5578 | } | |
5579 | } | |
5580 | ||
5581 | ||
06d91a5f N |
5582 | /* md_write_start(mddev, bi) |
5583 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5584 | * in superblock) before writing, schedule a superblock update |
5585 | * and wait for it to complete. | |
06d91a5f | 5586 | */ |
3d310eb7 | 5587 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5588 | { |
0fd62b86 | 5589 | int did_change = 0; |
06d91a5f | 5590 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5591 | return; |
06d91a5f | 5592 | |
f91de92e N |
5593 | BUG_ON(mddev->ro == 1); |
5594 | if (mddev->ro == 2) { | |
5595 | /* need to switch to read/write */ | |
5596 | mddev->ro = 0; | |
5597 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5598 | md_wakeup_thread(mddev->thread); | |
25156198 | 5599 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 5600 | did_change = 1; |
f91de92e | 5601 | } |
06d91a5f | 5602 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
5603 | if (mddev->safemode == 1) |
5604 | mddev->safemode = 0; | |
06d91a5f | 5605 | if (mddev->in_sync) { |
a9701a30 | 5606 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5607 | if (mddev->in_sync) { |
5608 | mddev->in_sync = 0; | |
850b2b42 | 5609 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 5610 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 5611 | did_change = 1; |
3d310eb7 | 5612 | } |
a9701a30 | 5613 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5614 | } |
0fd62b86 NB |
5615 | if (did_change) |
5616 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
09a44cc1 N |
5617 | wait_event(mddev->sb_wait, |
5618 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
5619 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
5620 | } |
5621 | ||
5622 | void md_write_end(mddev_t *mddev) | |
5623 | { | |
5624 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5625 | if (mddev->safemode == 2) | |
5626 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5627 | else if (mddev->safemode_delay) |
1da177e4 LT |
5628 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5629 | } | |
5630 | } | |
5631 | ||
2a2275d6 N |
5632 | /* md_allow_write(mddev) |
5633 | * Calling this ensures that the array is marked 'active' so that writes | |
5634 | * may proceed without blocking. It is important to call this before | |
5635 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5636 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
5637 | * |
5638 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
5639 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 5640 | */ |
b5470dc5 | 5641 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
5642 | { |
5643 | if (!mddev->pers) | |
b5470dc5 | 5644 | return 0; |
2a2275d6 | 5645 | if (mddev->ro) |
b5470dc5 | 5646 | return 0; |
1a0fd497 | 5647 | if (!mddev->pers->sync_request) |
b5470dc5 | 5648 | return 0; |
2a2275d6 N |
5649 | |
5650 | spin_lock_irq(&mddev->write_lock); | |
5651 | if (mddev->in_sync) { | |
5652 | mddev->in_sync = 0; | |
5653 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5654 | if (mddev->safemode_delay && | |
5655 | mddev->safemode == 0) | |
5656 | mddev->safemode = 1; | |
5657 | spin_unlock_irq(&mddev->write_lock); | |
5658 | md_update_sb(mddev, 0); | |
09a44cc1 | 5659 | sysfs_notify(&mddev->kobj, NULL, "array_state"); |
2a2275d6 N |
5660 | } else |
5661 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
5662 | |
5663 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
5664 | return -EAGAIN; | |
5665 | else | |
5666 | return 0; | |
2a2275d6 N |
5667 | } |
5668 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5669 | ||
1da177e4 LT |
5670 | #define SYNC_MARKS 10 |
5671 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5672 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5673 | { |
5674 | mddev_t *mddev2; | |
5675 | unsigned int currspeed = 0, | |
5676 | window; | |
57afd89f | 5677 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5678 | unsigned long mark[SYNC_MARKS]; |
5679 | sector_t mark_cnt[SYNC_MARKS]; | |
5680 | int last_mark,m; | |
5681 | struct list_head *tmp; | |
5682 | sector_t last_check; | |
57afd89f | 5683 | int skipped = 0; |
5fd6c1dc N |
5684 | struct list_head *rtmp; |
5685 | mdk_rdev_t *rdev; | |
61df9d91 | 5686 | char *desc; |
1da177e4 LT |
5687 | |
5688 | /* just incase thread restarts... */ | |
5689 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5690 | return; | |
5fd6c1dc N |
5691 | if (mddev->ro) /* never try to sync a read-only array */ |
5692 | return; | |
1da177e4 | 5693 | |
61df9d91 N |
5694 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5695 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5696 | desc = "data-check"; | |
5697 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5698 | desc = "requested-resync"; | |
5699 | else | |
5700 | desc = "resync"; | |
5701 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5702 | desc = "reshape"; | |
5703 | else | |
5704 | desc = "recovery"; | |
5705 | ||
1da177e4 LT |
5706 | /* we overload curr_resync somewhat here. |
5707 | * 0 == not engaged in resync at all | |
5708 | * 2 == checking that there is no conflict with another sync | |
5709 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5710 | * commense | |
5711 | * other == active in resync - this many blocks | |
5712 | * | |
5713 | * Before starting a resync we must have set curr_resync to | |
5714 | * 2, and then checked that every "conflicting" array has curr_resync | |
5715 | * less than ours. When we find one that is the same or higher | |
5716 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5717 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5718 | * This will mean we have to start checking from the beginning again. | |
5719 | * | |
5720 | */ | |
5721 | ||
5722 | do { | |
5723 | mddev->curr_resync = 2; | |
5724 | ||
5725 | try_again: | |
787453c2 | 5726 | if (kthread_should_stop()) { |
6985c43f | 5727 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5728 | goto skip; |
5729 | } | |
29ac4aa3 | 5730 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
5731 | if (mddev2 == mddev) |
5732 | continue; | |
90b08710 BS |
5733 | if (!mddev->parallel_resync |
5734 | && mddev2->curr_resync | |
5735 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
5736 | DEFINE_WAIT(wq); |
5737 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5738 | /* arbitrarily yield */ | |
5739 | mddev->curr_resync = 1; | |
5740 | wake_up(&resync_wait); | |
5741 | } | |
5742 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5743 | /* no need to wait here, we can wait the next | |
5744 | * time 'round when curr_resync == 2 | |
5745 | */ | |
5746 | continue; | |
787453c2 N |
5747 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
5748 | if (!kthread_should_stop() && | |
8712e553 | 5749 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5750 | printk(KERN_INFO "md: delaying %s of %s" |
5751 | " until %s has finished (they" | |
1da177e4 | 5752 | " share one or more physical units)\n", |
61df9d91 | 5753 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 LT |
5754 | mddev_put(mddev2); |
5755 | schedule(); | |
5756 | finish_wait(&resync_wait, &wq); | |
5757 | goto try_again; | |
5758 | } | |
5759 | finish_wait(&resync_wait, &wq); | |
5760 | } | |
5761 | } | |
5762 | } while (mddev->curr_resync < 2); | |
5763 | ||
5fd6c1dc | 5764 | j = 0; |
9d88883e | 5765 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5766 | /* resync follows the size requested by the personality, |
57afd89f | 5767 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5768 | */ |
5769 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5770 | mddev->resync_mismatches = 0; |
5fd6c1dc | 5771 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
5772 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
5773 | j = mddev->resync_min; | |
5774 | else if (!mddev->bitmap) | |
5fd6c1dc | 5775 | j = mddev->recovery_cp; |
5e96ee65 | 5776 | |
ccfcc3c1 N |
5777 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5778 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5779 | else { |
1da177e4 LT |
5780 | /* recovery follows the physical size of devices */ |
5781 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5782 | j = MaxSector; |
d089c6af | 5783 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
5784 | if (rdev->raid_disk >= 0 && |
5785 | !test_bit(Faulty, &rdev->flags) && | |
5786 | !test_bit(In_sync, &rdev->flags) && | |
5787 | rdev->recovery_offset < j) | |
5788 | j = rdev->recovery_offset; | |
5789 | } | |
1da177e4 | 5790 | |
61df9d91 N |
5791 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5792 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5793 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5794 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5795 | "(but not more than %d KB/sec) for %s.\n", |
5796 | speed_max(mddev), desc); | |
1da177e4 LT |
5797 | |
5798 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5799 | |
57afd89f | 5800 | io_sectors = 0; |
1da177e4 LT |
5801 | for (m = 0; m < SYNC_MARKS; m++) { |
5802 | mark[m] = jiffies; | |
57afd89f | 5803 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5804 | } |
5805 | last_mark = 0; | |
5806 | mddev->resync_mark = mark[last_mark]; | |
5807 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
5808 | ||
5809 | /* | |
5810 | * Tune reconstruction: | |
5811 | */ | |
5812 | window = 32*(PAGE_SIZE/512); | |
5813 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
5814 | window/2,(unsigned long long) max_sectors/2); | |
5815 | ||
5816 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
5817 | last_check = 0; |
5818 | ||
5819 | if (j>2) { | |
5820 | printk(KERN_INFO | |
61df9d91 N |
5821 | "md: resuming %s of %s from checkpoint.\n", |
5822 | desc, mdname(mddev)); | |
1da177e4 LT |
5823 | mddev->curr_resync = j; |
5824 | } | |
5825 | ||
5826 | while (j < max_sectors) { | |
57afd89f | 5827 | sector_t sectors; |
1da177e4 | 5828 | |
57afd89f | 5829 | skipped = 0; |
c6207277 N |
5830 | if (j >= mddev->resync_max) { |
5831 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
5832 | wait_event(mddev->recovery_wait, | |
5833 | mddev->resync_max > j | |
5834 | || kthread_should_stop()); | |
5835 | } | |
5836 | if (kthread_should_stop()) | |
5837 | goto interrupted; | |
57afd89f | 5838 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 5839 | currspeed < speed_min(mddev)); |
57afd89f | 5840 | if (sectors == 0) { |
dfc70645 | 5841 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5842 | goto out; |
5843 | } | |
57afd89f N |
5844 | |
5845 | if (!skipped) { /* actual IO requested */ | |
5846 | io_sectors += sectors; | |
5847 | atomic_add(sectors, &mddev->recovery_active); | |
5848 | } | |
5849 | ||
1da177e4 LT |
5850 | j += sectors; |
5851 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 5852 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
5853 | if (last_check == 0) |
5854 | /* this is the earliers that rebuilt will be | |
5855 | * visible in /proc/mdstat | |
5856 | */ | |
5857 | md_new_event(mddev); | |
57afd89f N |
5858 | |
5859 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
5860 | continue; |
5861 | ||
57afd89f | 5862 | last_check = io_sectors; |
1da177e4 | 5863 | |
dfc70645 | 5864 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
5865 | break; |
5866 | ||
5867 | repeat: | |
5868 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
5869 | /* step marks */ | |
5870 | int next = (last_mark+1) % SYNC_MARKS; | |
5871 | ||
5872 | mddev->resync_mark = mark[next]; | |
5873 | mddev->resync_mark_cnt = mark_cnt[next]; | |
5874 | mark[next] = jiffies; | |
57afd89f | 5875 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5876 | last_mark = next; |
5877 | } | |
5878 | ||
5879 | ||
c6207277 N |
5880 | if (kthread_should_stop()) |
5881 | goto interrupted; | |
5882 | ||
1da177e4 LT |
5883 | |
5884 | /* | |
5885 | * this loop exits only if either when we are slower than | |
5886 | * the 'hard' speed limit, or the system was IO-idle for | |
5887 | * a jiffy. | |
5888 | * the system might be non-idle CPU-wise, but we only care | |
5889 | * about not overloading the IO subsystem. (things like an | |
5890 | * e2fsck being done on the RAID array should execute fast) | |
5891 | */ | |
2ad8b1ef | 5892 | blk_unplug(mddev->queue); |
1da177e4 LT |
5893 | cond_resched(); |
5894 | ||
57afd89f N |
5895 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
5896 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 5897 | |
88202a0c N |
5898 | if (currspeed > speed_min(mddev)) { |
5899 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 5900 | !is_mddev_idle(mddev)) { |
c0e48521 | 5901 | msleep(500); |
1da177e4 LT |
5902 | goto repeat; |
5903 | } | |
5904 | } | |
5905 | } | |
61df9d91 | 5906 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
5907 | /* |
5908 | * this also signals 'finished resyncing' to md_stop | |
5909 | */ | |
5910 | out: | |
2ad8b1ef | 5911 | blk_unplug(mddev->queue); |
1da177e4 LT |
5912 | |
5913 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
5914 | ||
5915 | /* tell personality that we are finished */ | |
57afd89f | 5916 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 5917 | |
dfc70645 | 5918 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
5919 | mddev->curr_resync > 2) { |
5920 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
5921 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5922 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
5923 | printk(KERN_INFO | |
61df9d91 N |
5924 | "md: checkpointing %s of %s.\n", |
5925 | desc, mdname(mddev)); | |
5fd6c1dc N |
5926 | mddev->recovery_cp = mddev->curr_resync; |
5927 | } | |
5928 | } else | |
5929 | mddev->recovery_cp = MaxSector; | |
5930 | } else { | |
5931 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5932 | mddev->curr_resync = MaxSector; | |
d089c6af | 5933 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
5934 | if (rdev->raid_disk >= 0 && |
5935 | !test_bit(Faulty, &rdev->flags) && | |
5936 | !test_bit(In_sync, &rdev->flags) && | |
5937 | rdev->recovery_offset < mddev->curr_resync) | |
5938 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 5939 | } |
1da177e4 | 5940 | } |
17571284 | 5941 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5942 | |
1da177e4 LT |
5943 | skip: |
5944 | mddev->curr_resync = 0; | |
5e96ee65 | 5945 | mddev->resync_min = 0; |
c6207277 N |
5946 | mddev->resync_max = MaxSector; |
5947 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
5948 | wake_up(&resync_wait); |
5949 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
5950 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
5951 | return; |
5952 | ||
5953 | interrupted: | |
5954 | /* | |
5955 | * got a signal, exit. | |
5956 | */ | |
5957 | printk(KERN_INFO | |
5958 | "md: md_do_sync() got signal ... exiting\n"); | |
5959 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5960 | goto out; | |
5961 | ||
1da177e4 | 5962 | } |
29269553 | 5963 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
5964 | |
5965 | ||
b4c4c7b8 N |
5966 | static int remove_and_add_spares(mddev_t *mddev) |
5967 | { | |
5968 | mdk_rdev_t *rdev; | |
5969 | struct list_head *rtmp; | |
5970 | int spares = 0; | |
5971 | ||
d089c6af | 5972 | rdev_for_each(rdev, rtmp, mddev) |
b4c4c7b8 | 5973 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 5974 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
5975 | (test_bit(Faulty, &rdev->flags) || |
5976 | ! test_bit(In_sync, &rdev->flags)) && | |
5977 | atomic_read(&rdev->nr_pending)==0) { | |
5978 | if (mddev->pers->hot_remove_disk( | |
5979 | mddev, rdev->raid_disk)==0) { | |
5980 | char nm[20]; | |
5981 | sprintf(nm,"rd%d", rdev->raid_disk); | |
5982 | sysfs_remove_link(&mddev->kobj, nm); | |
5983 | rdev->raid_disk = -1; | |
5984 | } | |
5985 | } | |
5986 | ||
5987 | if (mddev->degraded) { | |
dfc70645 N |
5988 | rdev_for_each(rdev, rtmp, mddev) { |
5989 | if (rdev->raid_disk >= 0 && | |
5990 | !test_bit(In_sync, &rdev->flags)) | |
5991 | spares++; | |
b4c4c7b8 N |
5992 | if (rdev->raid_disk < 0 |
5993 | && !test_bit(Faulty, &rdev->flags)) { | |
5994 | rdev->recovery_offset = 0; | |
199050ea NB |
5995 | if (mddev->pers-> |
5996 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
5997 | char nm[20]; |
5998 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
5999 | if (sysfs_create_link(&mddev->kobj, |
6000 | &rdev->kobj, nm)) | |
6001 | printk(KERN_WARNING | |
6002 | "md: cannot register " | |
6003 | "%s for %s\n", | |
6004 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6005 | spares++; |
6006 | md_new_event(mddev); | |
6007 | } else | |
6008 | break; | |
6009 | } | |
dfc70645 | 6010 | } |
b4c4c7b8 N |
6011 | } |
6012 | return spares; | |
6013 | } | |
1da177e4 LT |
6014 | /* |
6015 | * This routine is regularly called by all per-raid-array threads to | |
6016 | * deal with generic issues like resync and super-block update. | |
6017 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6018 | * need this as they never do any recovery or update the superblock. | |
6019 | * | |
6020 | * It does not do any resync itself, but rather "forks" off other threads | |
6021 | * to do that as needed. | |
6022 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6023 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6024 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6025 | * and wakeups up this thread which will reap the thread and finish up. |
6026 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6027 | * | |
6028 | * The overall approach is: | |
6029 | * 1/ if the superblock needs updating, update it. | |
6030 | * 2/ If a recovery thread is running, don't do anything else. | |
6031 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6032 | * 4/ If there are any faulty devices, remove them. | |
6033 | * 5/ If array is degraded, try to add spares devices | |
6034 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6035 | */ | |
6036 | void md_check_recovery(mddev_t *mddev) | |
6037 | { | |
6038 | mdk_rdev_t *rdev; | |
6039 | struct list_head *rtmp; | |
6040 | ||
6041 | ||
5f40402d N |
6042 | if (mddev->bitmap) |
6043 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
6044 | |
6045 | if (mddev->ro) | |
6046 | return; | |
fca4d848 N |
6047 | |
6048 | if (signal_pending(current)) { | |
31a59e34 | 6049 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6050 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6051 | mdname(mddev)); | |
6052 | mddev->safemode = 2; | |
6053 | } | |
6054 | flush_signals(current); | |
6055 | } | |
6056 | ||
1da177e4 | 6057 | if ( ! ( |
e691063a | 6058 | (mddev->flags && !mddev->external) || |
1da177e4 | 6059 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6060 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6061 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6062 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6063 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6064 | )) |
6065 | return; | |
fca4d848 | 6066 | |
df5b89b3 | 6067 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6068 | int spares = 0; |
fca4d848 | 6069 | |
31a59e34 | 6070 | if (!mddev->external) { |
0fd62b86 | 6071 | int did_change = 0; |
31a59e34 N |
6072 | spin_lock_irq(&mddev->write_lock); |
6073 | if (mddev->safemode && | |
6074 | !atomic_read(&mddev->writes_pending) && | |
6075 | !mddev->in_sync && | |
6076 | mddev->recovery_cp == MaxSector) { | |
6077 | mddev->in_sync = 1; | |
0fd62b86 | 6078 | did_change = 1; |
31a59e34 N |
6079 | if (mddev->persistent) |
6080 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6081 | } | |
6082 | if (mddev->safemode == 1) | |
6083 | mddev->safemode = 0; | |
6084 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 NB |
6085 | if (did_change) |
6086 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
fca4d848 | 6087 | } |
fca4d848 | 6088 | |
850b2b42 N |
6089 | if (mddev->flags) |
6090 | md_update_sb(mddev, 0); | |
06d91a5f | 6091 | |
52664732 NB |
6092 | rdev_for_each(rdev, rtmp, mddev) |
6093 | if (test_and_clear_bit(StateChanged, &rdev->flags)) | |
6094 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
6095 | ||
06d91a5f | 6096 | |
1da177e4 LT |
6097 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6098 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6099 | /* resync/recovery still happening */ | |
6100 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6101 | goto unlock; | |
6102 | } | |
6103 | if (mddev->sync_thread) { | |
6104 | /* resync has finished, collect result */ | |
6105 | md_unregister_thread(mddev->sync_thread); | |
6106 | mddev->sync_thread = NULL; | |
dfc70645 | 6107 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
1da177e4 LT |
6108 | /* success...*/ |
6109 | /* activate any spares */ | |
a99ac971 NB |
6110 | if (mddev->pers->spare_active(mddev)) |
6111 | sysfs_notify(&mddev->kobj, NULL, | |
6112 | "degraded"); | |
1da177e4 | 6113 | } |
850b2b42 | 6114 | md_update_sb(mddev, 1); |
41158c7e N |
6115 | |
6116 | /* if array is no-longer degraded, then any saved_raid_disk | |
6117 | * information must be scrapped | |
6118 | */ | |
6119 | if (!mddev->degraded) | |
d089c6af | 6120 | rdev_for_each(rdev, rtmp, mddev) |
41158c7e N |
6121 | rdev->saved_raid_disk = -1; |
6122 | ||
1da177e4 LT |
6123 | mddev->recovery = 0; |
6124 | /* flag recovery needed just to double check */ | |
6125 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
72a23c21 | 6126 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
d7603b7e | 6127 | md_new_event(mddev); |
1da177e4 LT |
6128 | goto unlock; |
6129 | } | |
72a23c21 NB |
6130 | /* Set RUNNING before clearing NEEDED to avoid |
6131 | * any transients in the value of "sync_action". | |
6132 | */ | |
6133 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6134 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6135 | /* Clear some bits that don't mean anything, but |
6136 | * might be left set | |
6137 | */ | |
24dd469d N |
6138 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6139 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6140 | |
5fd6c1dc N |
6141 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6142 | goto unlock; | |
1da177e4 LT |
6143 | /* no recovery is running. |
6144 | * remove any failed drives, then | |
6145 | * add spares if possible. | |
6146 | * Spare are also removed and re-added, to allow | |
6147 | * the personality to fail the re-add. | |
6148 | */ | |
1da177e4 | 6149 | |
b4c4c7b8 N |
6150 | if (mddev->reshape_position != MaxSector) { |
6151 | if (mddev->pers->check_reshape(mddev) != 0) | |
6152 | /* Cannot proceed */ | |
6153 | goto unlock; | |
6154 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6155 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6156 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6157 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6158 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
72a23c21 | 6159 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6160 | } else if (mddev->recovery_cp < MaxSector) { |
6161 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6162 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6163 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6164 | /* nothing to be done ... */ | |
1da177e4 | 6165 | goto unlock; |
24dd469d | 6166 | |
1da177e4 | 6167 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6168 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6169 | /* We are adding a device or devices to an array | |
6170 | * which has the bitmap stored on all devices. | |
6171 | * So make sure all bitmap pages get written | |
6172 | */ | |
6173 | bitmap_write_all(mddev->bitmap); | |
6174 | } | |
1da177e4 LT |
6175 | mddev->sync_thread = md_register_thread(md_do_sync, |
6176 | mddev, | |
6177 | "%s_resync"); | |
6178 | if (!mddev->sync_thread) { | |
6179 | printk(KERN_ERR "%s: could not start resync" | |
6180 | " thread...\n", | |
6181 | mdname(mddev)); | |
6182 | /* leave the spares where they are, it shouldn't hurt */ | |
6183 | mddev->recovery = 0; | |
d7603b7e | 6184 | } else |
1da177e4 | 6185 | md_wakeup_thread(mddev->sync_thread); |
72a23c21 | 6186 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
d7603b7e | 6187 | md_new_event(mddev); |
1da177e4 LT |
6188 | } |
6189 | unlock: | |
72a23c21 NB |
6190 | if (!mddev->sync_thread) { |
6191 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6192 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6193 | &mddev->recovery)) | |
6194 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); | |
6195 | } | |
1da177e4 LT |
6196 | mddev_unlock(mddev); |
6197 | } | |
6198 | } | |
6199 | ||
6bfe0b49 DW |
6200 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6201 | { | |
6202 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
6203 | wait_event_timeout(rdev->blocked_wait, | |
6204 | !test_bit(Blocked, &rdev->flags), | |
6205 | msecs_to_jiffies(5000)); | |
6206 | rdev_dec_pending(rdev, mddev); | |
6207 | } | |
6208 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6209 | ||
75c96f85 AB |
6210 | static int md_notify_reboot(struct notifier_block *this, |
6211 | unsigned long code, void *x) | |
1da177e4 LT |
6212 | { |
6213 | struct list_head *tmp; | |
6214 | mddev_t *mddev; | |
6215 | ||
6216 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6217 | ||
6218 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6219 | ||
29ac4aa3 | 6220 | for_each_mddev(mddev, tmp) |
c71d4887 | 6221 | if (mddev_trylock(mddev)) { |
df5b20cf | 6222 | do_md_stop (mddev, 1, 0); |
c71d4887 NB |
6223 | mddev_unlock(mddev); |
6224 | } | |
1da177e4 LT |
6225 | /* |
6226 | * certain more exotic SCSI devices are known to be | |
6227 | * volatile wrt too early system reboots. While the | |
6228 | * right place to handle this issue is the given | |
6229 | * driver, we do want to have a safe RAID driver ... | |
6230 | */ | |
6231 | mdelay(1000*1); | |
6232 | } | |
6233 | return NOTIFY_DONE; | |
6234 | } | |
6235 | ||
75c96f85 | 6236 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6237 | .notifier_call = md_notify_reboot, |
6238 | .next = NULL, | |
6239 | .priority = INT_MAX, /* before any real devices */ | |
6240 | }; | |
6241 | ||
6242 | static void md_geninit(void) | |
6243 | { | |
1da177e4 LT |
6244 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6245 | ||
c7705f34 | 6246 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6247 | } |
6248 | ||
75c96f85 | 6249 | static int __init md_init(void) |
1da177e4 | 6250 | { |
1da177e4 LT |
6251 | if (register_blkdev(MAJOR_NR, "md")) |
6252 | return -1; | |
6253 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
6254 | unregister_blkdev(MAJOR_NR, "md"); | |
6255 | return -1; | |
6256 | } | |
e8703fe1 N |
6257 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
6258 | md_probe, NULL, NULL); | |
6259 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6260 | md_probe, NULL, NULL); |
6261 | ||
1da177e4 | 6262 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6263 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6264 | |
6265 | md_geninit(); | |
6266 | return (0); | |
6267 | } | |
6268 | ||
6269 | ||
6270 | #ifndef MODULE | |
6271 | ||
6272 | /* | |
6273 | * Searches all registered partitions for autorun RAID arrays | |
6274 | * at boot time. | |
6275 | */ | |
4d936ec1 ME |
6276 | |
6277 | static LIST_HEAD(all_detected_devices); | |
6278 | struct detected_devices_node { | |
6279 | struct list_head list; | |
6280 | dev_t dev; | |
6281 | }; | |
1da177e4 LT |
6282 | |
6283 | void md_autodetect_dev(dev_t dev) | |
6284 | { | |
4d936ec1 ME |
6285 | struct detected_devices_node *node_detected_dev; |
6286 | ||
6287 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6288 | if (node_detected_dev) { | |
6289 | node_detected_dev->dev = dev; | |
6290 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6291 | } else { | |
6292 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6293 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6294 | } | |
1da177e4 LT |
6295 | } |
6296 | ||
6297 | ||
6298 | static void autostart_arrays(int part) | |
6299 | { | |
6300 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6301 | struct detected_devices_node *node_detected_dev; |
6302 | dev_t dev; | |
6303 | int i_scanned, i_passed; | |
1da177e4 | 6304 | |
4d936ec1 ME |
6305 | i_scanned = 0; |
6306 | i_passed = 0; | |
1da177e4 | 6307 | |
4d936ec1 | 6308 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6309 | |
4d936ec1 ME |
6310 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6311 | i_scanned++; | |
6312 | node_detected_dev = list_entry(all_detected_devices.next, | |
6313 | struct detected_devices_node, list); | |
6314 | list_del(&node_detected_dev->list); | |
6315 | dev = node_detected_dev->dev; | |
6316 | kfree(node_detected_dev); | |
df968c4e | 6317 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6318 | if (IS_ERR(rdev)) |
6319 | continue; | |
6320 | ||
b2d444d7 | 6321 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6322 | MD_BUG(); |
6323 | continue; | |
6324 | } | |
d0fae18f | 6325 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6326 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6327 | i_passed++; |
1da177e4 | 6328 | } |
4d936ec1 ME |
6329 | |
6330 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6331 | i_scanned, i_passed); | |
1da177e4 LT |
6332 | |
6333 | autorun_devices(part); | |
6334 | } | |
6335 | ||
fdee8ae4 | 6336 | #endif /* !MODULE */ |
1da177e4 LT |
6337 | |
6338 | static __exit void md_exit(void) | |
6339 | { | |
6340 | mddev_t *mddev; | |
6341 | struct list_head *tmp; | |
8ab5e4c1 | 6342 | |
e8703fe1 N |
6343 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
6344 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
6345 | |
6346 | unregister_blkdev(MAJOR_NR,"md"); | |
6347 | unregister_blkdev(mdp_major, "mdp"); | |
6348 | unregister_reboot_notifier(&md_notifier); | |
6349 | unregister_sysctl_table(raid_table_header); | |
6350 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6351 | for_each_mddev(mddev, tmp) { |
1da177e4 LT |
6352 | struct gendisk *disk = mddev->gendisk; |
6353 | if (!disk) | |
6354 | continue; | |
6355 | export_array(mddev); | |
6356 | del_gendisk(disk); | |
6357 | put_disk(disk); | |
6358 | mddev->gendisk = NULL; | |
6359 | mddev_put(mddev); | |
6360 | } | |
6361 | } | |
6362 | ||
685784aa | 6363 | subsys_initcall(md_init); |
1da177e4 LT |
6364 | module_exit(md_exit) |
6365 | ||
f91de92e N |
6366 | static int get_ro(char *buffer, struct kernel_param *kp) |
6367 | { | |
6368 | return sprintf(buffer, "%d", start_readonly); | |
6369 | } | |
6370 | static int set_ro(const char *val, struct kernel_param *kp) | |
6371 | { | |
6372 | char *e; | |
6373 | int num = simple_strtoul(val, &e, 10); | |
6374 | if (*val && (*e == '\0' || *e == '\n')) { | |
6375 | start_readonly = num; | |
4dbcdc75 | 6376 | return 0; |
f91de92e N |
6377 | } |
6378 | return -EINVAL; | |
6379 | } | |
6380 | ||
80ca3a44 N |
6381 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6382 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6383 | |
f91de92e | 6384 | |
1da177e4 LT |
6385 | EXPORT_SYMBOL(register_md_personality); |
6386 | EXPORT_SYMBOL(unregister_md_personality); | |
6387 | EXPORT_SYMBOL(md_error); | |
6388 | EXPORT_SYMBOL(md_done_sync); | |
6389 | EXPORT_SYMBOL(md_write_start); | |
6390 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6391 | EXPORT_SYMBOL(md_register_thread); |
6392 | EXPORT_SYMBOL(md_unregister_thread); | |
6393 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6394 | EXPORT_SYMBOL(md_check_recovery); |
6395 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6396 | MODULE_ALIAS("md"); |
72008652 | 6397 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |