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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 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
1da177e4 | 36 | #include <linux/raid/md.h> |
32a7627c | 37 | #include <linux/raid/bitmap.h> |
1da177e4 | 38 | #include <linux/sysctl.h> |
1da177e4 | 39 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
fb4d8c76 N |
42 | #include <linux/hdreg.h> |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/random.h> | |
45 | #include <linux/reboot.h> | |
32a7627c N |
46 | #include <linux/file.h> |
47 | ||
1da177e4 | 48 | #define MAJOR_NR MD_MAJOR |
1da177e4 LT |
49 | |
50 | /* 63 partitions with the alternate major number (mdp) */ | |
51 | #define MdpMinorShift 6 | |
52 | ||
53 | #define DEBUG 0 | |
54 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
55 | ||
56 | ||
57 | #ifndef MODULE | |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
2604b703 | 61 | static LIST_HEAD(pers_list); |
1da177e4 LT |
62 | static DEFINE_SPINLOCK(pers_lock); |
63 | ||
5e56341d AB |
64 | static void md_print_devices(void); |
65 | ||
90b08710 BS |
66 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
67 | ||
5e56341d AB |
68 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
69 | ||
1da177e4 LT |
70 | /* |
71 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
72 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
73 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 74 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
75 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
76 | * speed limit - in case reconstruction slows down your system despite | |
77 | * idle IO detection. | |
78 | * | |
79 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 80 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
81 | */ |
82 | ||
83 | static int sysctl_speed_limit_min = 1000; | |
84 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
85 | static inline int speed_min(mddev_t *mddev) |
86 | { | |
87 | return mddev->sync_speed_min ? | |
88 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
89 | } | |
90 | ||
91 | static inline int speed_max(mddev_t *mddev) | |
92 | { | |
93 | return mddev->sync_speed_max ? | |
94 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
95 | } | |
1da177e4 LT |
96 | |
97 | static struct ctl_table_header *raid_table_header; | |
98 | ||
99 | static ctl_table raid_table[] = { | |
100 | { | |
101 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
102 | .procname = "speed_limit_min", | |
103 | .data = &sysctl_speed_limit_min, | |
104 | .maxlen = sizeof(int), | |
80ca3a44 | 105 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
106 | .proc_handler = &proc_dointvec, |
107 | }, | |
108 | { | |
109 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
110 | .procname = "speed_limit_max", | |
111 | .data = &sysctl_speed_limit_max, | |
112 | .maxlen = sizeof(int), | |
80ca3a44 | 113 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
114 | .proc_handler = &proc_dointvec, |
115 | }, | |
116 | { .ctl_name = 0 } | |
117 | }; | |
118 | ||
119 | static ctl_table raid_dir_table[] = { | |
120 | { | |
121 | .ctl_name = DEV_RAID, | |
122 | .procname = "raid", | |
123 | .maxlen = 0, | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
125 | .child = raid_table, |
126 | }, | |
127 | { .ctl_name = 0 } | |
128 | }; | |
129 | ||
130 | static ctl_table raid_root_table[] = { | |
131 | { | |
132 | .ctl_name = CTL_DEV, | |
133 | .procname = "dev", | |
134 | .maxlen = 0, | |
135 | .mode = 0555, | |
136 | .child = raid_dir_table, | |
137 | }, | |
138 | { .ctl_name = 0 } | |
139 | }; | |
140 | ||
141 | static struct block_device_operations md_fops; | |
142 | ||
f91de92e N |
143 | static int start_readonly; |
144 | ||
d7603b7e N |
145 | /* |
146 | * We have a system wide 'event count' that is incremented | |
147 | * on any 'interesting' event, and readers of /proc/mdstat | |
148 | * can use 'poll' or 'select' to find out when the event | |
149 | * count increases. | |
150 | * | |
151 | * Events are: | |
152 | * start array, stop array, error, add device, remove device, | |
153 | * start build, activate spare | |
154 | */ | |
2989ddbd | 155 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 156 | static atomic_t md_event_count; |
29269553 | 157 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
158 | { |
159 | atomic_inc(&md_event_count); | |
160 | wake_up(&md_event_waiters); | |
161 | } | |
29269553 | 162 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 163 | |
c331eb04 N |
164 | /* Alternate version that can be called from interrupts |
165 | * when calling sysfs_notify isn't needed. | |
166 | */ | |
05381954 | 167 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
168 | { |
169 | atomic_inc(&md_event_count); | |
170 | wake_up(&md_event_waiters); | |
171 | } | |
172 | ||
1da177e4 LT |
173 | /* |
174 | * Enables to iterate over all existing md arrays | |
175 | * all_mddevs_lock protects this list. | |
176 | */ | |
177 | static LIST_HEAD(all_mddevs); | |
178 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
179 | ||
180 | ||
181 | /* | |
182 | * iterates through all used mddevs in the system. | |
183 | * We take care to grab the all_mddevs_lock whenever navigating | |
184 | * the list, and to always hold a refcount when unlocked. | |
185 | * Any code which breaks out of this loop while own | |
186 | * a reference to the current mddev and must mddev_put it. | |
187 | */ | |
29ac4aa3 | 188 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
189 | \ |
190 | for (({ spin_lock(&all_mddevs_lock); \ | |
191 | tmp = all_mddevs.next; \ | |
192 | mddev = NULL;}); \ | |
193 | ({ if (tmp != &all_mddevs) \ | |
194 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
195 | spin_unlock(&all_mddevs_lock); \ | |
196 | if (mddev) mddev_put(mddev); \ | |
197 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
198 | tmp != &all_mddevs;}); \ | |
199 | ({ spin_lock(&all_mddevs_lock); \ | |
200 | tmp = tmp->next;}) \ | |
201 | ) | |
202 | ||
203 | ||
d710e138 | 204 | static int md_fail_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 205 | { |
6712ecf8 | 206 | bio_io_error(bio); |
1da177e4 LT |
207 | return 0; |
208 | } | |
209 | ||
210 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
211 | { | |
212 | atomic_inc(&mddev->active); | |
213 | return mddev; | |
214 | } | |
215 | ||
216 | static void mddev_put(mddev_t *mddev) | |
217 | { | |
218 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
219 | return; | |
220 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
221 | list_del(&mddev->all_mddevs); | |
926ce2d8 | 222 | spin_unlock(&all_mddevs_lock); |
1312f40e | 223 | blk_cleanup_queue(mddev->queue); |
c10997f6 | 224 | kobject_put(&mddev->kobj); |
926ce2d8 N |
225 | } else |
226 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
227 | } |
228 | ||
229 | static mddev_t * mddev_find(dev_t unit) | |
230 | { | |
231 | mddev_t *mddev, *new = NULL; | |
232 | ||
233 | retry: | |
234 | spin_lock(&all_mddevs_lock); | |
235 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
236 | if (mddev->unit == unit) { | |
237 | mddev_get(mddev); | |
238 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 239 | kfree(new); |
1da177e4 LT |
240 | return mddev; |
241 | } | |
242 | ||
243 | if (new) { | |
244 | list_add(&new->all_mddevs, &all_mddevs); | |
245 | spin_unlock(&all_mddevs_lock); | |
246 | return new; | |
247 | } | |
248 | spin_unlock(&all_mddevs_lock); | |
249 | ||
9ffae0cf | 250 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
251 | if (!new) |
252 | return NULL; | |
253 | ||
1da177e4 LT |
254 | new->unit = unit; |
255 | if (MAJOR(unit) == MD_MAJOR) | |
256 | new->md_minor = MINOR(unit); | |
257 | else | |
258 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
259 | ||
df5b89b3 | 260 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
261 | INIT_LIST_HEAD(&new->disks); |
262 | INIT_LIST_HEAD(&new->all_mddevs); | |
263 | init_timer(&new->safemode_timer); | |
264 | atomic_set(&new->active, 1); | |
f2ea68cf | 265 | atomic_set(&new->openers, 0); |
06d91a5f | 266 | spin_lock_init(&new->write_lock); |
3d310eb7 | 267 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 268 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 269 | new->reshape_position = MaxSector; |
5e96ee65 | 270 | new->resync_min = 0; |
c6207277 | 271 | new->resync_max = MaxSector; |
d897dbf9 | 272 | new->level = LEVEL_NONE; |
1da177e4 LT |
273 | |
274 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
275 | if (!new->queue) { | |
276 | kfree(new); | |
277 | return NULL; | |
278 | } | |
75ad23bc NP |
279 | /* Can be unlocked because the queue is new: no concurrency */ |
280 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue); | |
1da177e4 LT |
281 | |
282 | blk_queue_make_request(new->queue, md_fail_request); | |
283 | ||
284 | goto retry; | |
285 | } | |
286 | ||
287 | static inline int mddev_lock(mddev_t * mddev) | |
288 | { | |
df5b89b3 | 289 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
290 | } |
291 | ||
1da177e4 LT |
292 | static inline int mddev_trylock(mddev_t * mddev) |
293 | { | |
df5b89b3 | 294 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
295 | } |
296 | ||
297 | static inline void mddev_unlock(mddev_t * mddev) | |
298 | { | |
df5b89b3 | 299 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 300 | |
005eca5e | 301 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
302 | } |
303 | ||
2989ddbd | 304 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 LT |
305 | { |
306 | mdk_rdev_t * rdev; | |
307 | struct list_head *tmp; | |
308 | ||
d089c6af | 309 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
310 | if (rdev->desc_nr == nr) |
311 | return rdev; | |
312 | } | |
313 | return NULL; | |
314 | } | |
315 | ||
316 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
317 | { | |
318 | struct list_head *tmp; | |
319 | mdk_rdev_t *rdev; | |
320 | ||
d089c6af | 321 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
322 | if (rdev->bdev->bd_dev == dev) |
323 | return rdev; | |
324 | } | |
325 | return NULL; | |
326 | } | |
327 | ||
d9d166c2 | 328 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
329 | { |
330 | struct mdk_personality *pers; | |
d9d166c2 N |
331 | list_for_each_entry(pers, &pers_list, list) { |
332 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 333 | return pers; |
d9d166c2 N |
334 | if (strcmp(pers->name, clevel)==0) |
335 | return pers; | |
336 | } | |
2604b703 N |
337 | return NULL; |
338 | } | |
339 | ||
b73df2d3 | 340 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 341 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 342 | { |
b73df2d3 AN |
343 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
344 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
345 | } |
346 | ||
e7debaa4 | 347 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 348 | { |
0f420358 | 349 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
350 | |
351 | if (chunk_size) | |
e7debaa4 AN |
352 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
353 | return num_sectors; | |
1da177e4 LT |
354 | } |
355 | ||
356 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
357 | { | |
358 | if (rdev->sb_page) | |
359 | MD_BUG(); | |
360 | ||
361 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
362 | if (!rdev->sb_page) { | |
363 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 364 | return -ENOMEM; |
1da177e4 LT |
365 | } |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static void free_disk_sb(mdk_rdev_t * rdev) | |
371 | { | |
372 | if (rdev->sb_page) { | |
2d1f3b5d | 373 | put_page(rdev->sb_page); |
1da177e4 LT |
374 | rdev->sb_loaded = 0; |
375 | rdev->sb_page = NULL; | |
0f420358 | 376 | rdev->sb_start = 0; |
1da177e4 LT |
377 | rdev->size = 0; |
378 | } | |
379 | } | |
380 | ||
381 | ||
6712ecf8 | 382 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
383 | { |
384 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 385 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 386 | |
3a0f5bbb N |
387 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
388 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
389 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
390 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 391 | md_error(mddev, rdev); |
3a0f5bbb | 392 | } |
7bfa19f2 | 393 | |
a9701a30 N |
394 | if (atomic_dec_and_test(&mddev->pending_writes)) |
395 | wake_up(&mddev->sb_wait); | |
f8b58edf | 396 | bio_put(bio); |
7bfa19f2 N |
397 | } |
398 | ||
6712ecf8 | 399 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
400 | { |
401 | struct bio *bio2 = bio->bi_private; | |
402 | mdk_rdev_t *rdev = bio2->bi_private; | |
403 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
404 | |
405 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
406 | error == -EOPNOTSUPP) { | |
407 | unsigned long flags; | |
408 | /* barriers don't appear to be supported :-( */ | |
409 | set_bit(BarriersNotsupp, &rdev->flags); | |
410 | mddev->barriers_work = 0; | |
411 | spin_lock_irqsave(&mddev->write_lock, flags); | |
412 | bio2->bi_next = mddev->biolist; | |
413 | mddev->biolist = bio2; | |
414 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
415 | wake_up(&mddev->sb_wait); | |
416 | bio_put(bio); | |
6712ecf8 N |
417 | } else { |
418 | bio_put(bio2); | |
419 | bio->bi_private = rdev; | |
420 | super_written(bio, error); | |
a9701a30 | 421 | } |
a9701a30 N |
422 | } |
423 | ||
7bfa19f2 N |
424 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
425 | sector_t sector, int size, struct page *page) | |
426 | { | |
427 | /* write first size bytes of page to sector of rdev | |
428 | * Increment mddev->pending_writes before returning | |
429 | * and decrement it on completion, waking up sb_wait | |
430 | * if zero is reached. | |
431 | * If an error occurred, call md_error | |
a9701a30 N |
432 | * |
433 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
434 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
435 | */ |
436 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 437 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
438 | |
439 | bio->bi_bdev = rdev->bdev; | |
440 | bio->bi_sector = sector; | |
441 | bio_add_page(bio, page, size, 0); | |
442 | bio->bi_private = rdev; | |
443 | bio->bi_end_io = super_written; | |
a9701a30 N |
444 | bio->bi_rw = rw; |
445 | ||
7bfa19f2 | 446 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
447 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
448 | struct bio *rbio; | |
449 | rw |= (1<<BIO_RW_BARRIER); | |
450 | rbio = bio_clone(bio, GFP_NOIO); | |
451 | rbio->bi_private = bio; | |
452 | rbio->bi_end_io = super_written_barrier; | |
453 | submit_bio(rw, rbio); | |
454 | } else | |
455 | submit_bio(rw, bio); | |
456 | } | |
457 | ||
458 | void md_super_wait(mddev_t *mddev) | |
459 | { | |
460 | /* wait for all superblock writes that were scheduled to complete. | |
461 | * if any had to be retried (due to BARRIER problems), retry them | |
462 | */ | |
463 | DEFINE_WAIT(wq); | |
464 | for(;;) { | |
465 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
466 | if (atomic_read(&mddev->pending_writes)==0) | |
467 | break; | |
468 | while (mddev->biolist) { | |
469 | struct bio *bio; | |
470 | spin_lock_irq(&mddev->write_lock); | |
471 | bio = mddev->biolist; | |
472 | mddev->biolist = bio->bi_next ; | |
473 | bio->bi_next = NULL; | |
474 | spin_unlock_irq(&mddev->write_lock); | |
475 | submit_bio(bio->bi_rw, bio); | |
476 | } | |
477 | schedule(); | |
478 | } | |
479 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
480 | } |
481 | ||
6712ecf8 | 482 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 483 | { |
1da177e4 | 484 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
485 | } |
486 | ||
a654b9d8 | 487 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
488 | struct page *page, int rw) |
489 | { | |
baaa2c51 | 490 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
491 | struct completion event; |
492 | int ret; | |
493 | ||
494 | rw |= (1 << BIO_RW_SYNC); | |
495 | ||
496 | bio->bi_bdev = bdev; | |
497 | bio->bi_sector = sector; | |
498 | bio_add_page(bio, page, size, 0); | |
499 | init_completion(&event); | |
500 | bio->bi_private = &event; | |
501 | bio->bi_end_io = bi_complete; | |
502 | submit_bio(rw, bio); | |
503 | wait_for_completion(&event); | |
504 | ||
505 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
506 | bio_put(bio); | |
507 | return ret; | |
508 | } | |
a8745db2 | 509 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 510 | |
0002b271 | 511 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
512 | { |
513 | char b[BDEVNAME_SIZE]; | |
514 | if (!rdev->sb_page) { | |
515 | MD_BUG(); | |
516 | return -EINVAL; | |
517 | } | |
518 | if (rdev->sb_loaded) | |
519 | return 0; | |
520 | ||
521 | ||
0f420358 | 522 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
523 | goto fail; |
524 | rdev->sb_loaded = 1; | |
525 | return 0; | |
526 | ||
527 | fail: | |
528 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
529 | bdevname(rdev->bdev,b)); | |
530 | return -EINVAL; | |
531 | } | |
532 | ||
533 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
534 | { | |
05710466 AN |
535 | return sb1->set_uuid0 == sb2->set_uuid0 && |
536 | sb1->set_uuid1 == sb2->set_uuid1 && | |
537 | sb1->set_uuid2 == sb2->set_uuid2 && | |
538 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
539 | } |
540 | ||
1da177e4 LT |
541 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
542 | { | |
543 | int ret; | |
544 | mdp_super_t *tmp1, *tmp2; | |
545 | ||
546 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
547 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
548 | ||
549 | if (!tmp1 || !tmp2) { | |
550 | ret = 0; | |
35020f1a | 551 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
552 | goto abort; |
553 | } | |
554 | ||
555 | *tmp1 = *sb1; | |
556 | *tmp2 = *sb2; | |
557 | ||
558 | /* | |
559 | * nr_disks is not constant | |
560 | */ | |
561 | tmp1->nr_disks = 0; | |
562 | tmp2->nr_disks = 0; | |
563 | ||
ce0c8e05 | 564 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 565 | abort: |
990a8baf JJ |
566 | kfree(tmp1); |
567 | kfree(tmp2); | |
1da177e4 LT |
568 | return ret; |
569 | } | |
570 | ||
4d167f09 N |
571 | |
572 | static u32 md_csum_fold(u32 csum) | |
573 | { | |
574 | csum = (csum & 0xffff) + (csum >> 16); | |
575 | return (csum & 0xffff) + (csum >> 16); | |
576 | } | |
577 | ||
1da177e4 LT |
578 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
579 | { | |
4d167f09 N |
580 | u64 newcsum = 0; |
581 | u32 *sb32 = (u32*)sb; | |
582 | int i; | |
1da177e4 LT |
583 | unsigned int disk_csum, csum; |
584 | ||
585 | disk_csum = sb->sb_csum; | |
586 | sb->sb_csum = 0; | |
4d167f09 N |
587 | |
588 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
589 | newcsum += sb32[i]; | |
590 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
591 | ||
592 | ||
593 | #ifdef CONFIG_ALPHA | |
594 | /* This used to use csum_partial, which was wrong for several | |
595 | * reasons including that different results are returned on | |
596 | * different architectures. It isn't critical that we get exactly | |
597 | * the same return value as before (we always csum_fold before | |
598 | * testing, and that removes any differences). However as we | |
599 | * know that csum_partial always returned a 16bit value on | |
600 | * alphas, do a fold to maximise conformity to previous behaviour. | |
601 | */ | |
602 | sb->sb_csum = md_csum_fold(disk_csum); | |
603 | #else | |
1da177e4 | 604 | sb->sb_csum = disk_csum; |
4d167f09 | 605 | #endif |
1da177e4 LT |
606 | return csum; |
607 | } | |
608 | ||
609 | ||
610 | /* | |
611 | * Handle superblock details. | |
612 | * We want to be able to handle multiple superblock formats | |
613 | * so we have a common interface to them all, and an array of | |
614 | * different handlers. | |
615 | * We rely on user-space to write the initial superblock, and support | |
616 | * reading and updating of superblocks. | |
617 | * Interface methods are: | |
618 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
619 | * loads and validates a superblock on dev. | |
620 | * if refdev != NULL, compare superblocks on both devices | |
621 | * Return: | |
622 | * 0 - dev has a superblock that is compatible with refdev | |
623 | * 1 - dev has a superblock that is compatible and newer than refdev | |
624 | * so dev should be used as the refdev in future | |
625 | * -EINVAL superblock incompatible or invalid | |
626 | * -othererror e.g. -EIO | |
627 | * | |
628 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
629 | * Verify that dev is acceptable into mddev. | |
630 | * The first time, mddev->raid_disks will be 0, and data from | |
631 | * dev should be merged in. Subsequent calls check that dev | |
632 | * is new enough. Return 0 or -EINVAL | |
633 | * | |
634 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
635 | * Update the superblock for rdev with data in mddev | |
636 | * This does not write to disc. | |
637 | * | |
638 | */ | |
639 | ||
640 | struct super_type { | |
0cd17fec CW |
641 | char *name; |
642 | struct module *owner; | |
643 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
644 | int minor_version); | |
645 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
646 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
647 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 648 | sector_t num_sectors); |
1da177e4 LT |
649 | }; |
650 | ||
651 | /* | |
652 | * load_super for 0.90.0 | |
653 | */ | |
654 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
655 | { | |
656 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
657 | mdp_super_t *sb; | |
658 | int ret; | |
1da177e4 LT |
659 | |
660 | /* | |
0f420358 | 661 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
662 | * it's at the end of the disk. |
663 | * | |
664 | * It also happens to be a multiple of 4Kb. | |
665 | */ | |
0f420358 | 666 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 667 | |
0002b271 | 668 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
669 | if (ret) return ret; |
670 | ||
671 | ret = -EINVAL; | |
672 | ||
673 | bdevname(rdev->bdev, b); | |
674 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
675 | ||
676 | if (sb->md_magic != MD_SB_MAGIC) { | |
677 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
678 | b); | |
679 | goto abort; | |
680 | } | |
681 | ||
682 | if (sb->major_version != 0 || | |
f6705578 N |
683 | sb->minor_version < 90 || |
684 | sb->minor_version > 91) { | |
1da177e4 LT |
685 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
686 | sb->major_version, sb->minor_version, | |
687 | b); | |
688 | goto abort; | |
689 | } | |
690 | ||
691 | if (sb->raid_disks <= 0) | |
692 | goto abort; | |
693 | ||
4d167f09 | 694 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
695 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
696 | b); | |
697 | goto abort; | |
698 | } | |
699 | ||
700 | rdev->preferred_minor = sb->md_minor; | |
701 | rdev->data_offset = 0; | |
0002b271 | 702 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 703 | |
e11e93fa N |
704 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
705 | if (sb->level != 1 && sb->level != 4 | |
706 | && sb->level != 5 && sb->level != 6 | |
707 | && sb->level != 10) { | |
708 | /* FIXME use a better test */ | |
709 | printk(KERN_WARNING | |
710 | "md: bitmaps not supported for this level.\n"); | |
711 | goto abort; | |
712 | } | |
713 | } | |
714 | ||
1da177e4 LT |
715 | if (sb->level == LEVEL_MULTIPATH) |
716 | rdev->desc_nr = -1; | |
717 | else | |
718 | rdev->desc_nr = sb->this_disk.number; | |
719 | ||
9a7b2b0f | 720 | if (!refdev) { |
1da177e4 | 721 | ret = 1; |
9a7b2b0f | 722 | } else { |
1da177e4 LT |
723 | __u64 ev1, ev2; |
724 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
725 | if (!uuid_equal(refsb, sb)) { | |
726 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
727 | b, bdevname(refdev->bdev,b2)); | |
728 | goto abort; | |
729 | } | |
730 | if (!sb_equal(refsb, sb)) { | |
731 | printk(KERN_WARNING "md: %s has same UUID" | |
732 | " but different superblock to %s\n", | |
733 | b, bdevname(refdev->bdev, b2)); | |
734 | goto abort; | |
735 | } | |
736 | ev1 = md_event(sb); | |
737 | ev2 = md_event(refsb); | |
738 | if (ev1 > ev2) | |
739 | ret = 1; | |
740 | else | |
741 | ret = 0; | |
742 | } | |
e7debaa4 | 743 | rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2; |
1da177e4 | 744 | |
2bf071bf N |
745 | if (rdev->size < sb->size && sb->level > 1) |
746 | /* "this cannot possibly happen" ... */ | |
747 | ret = -EINVAL; | |
748 | ||
1da177e4 LT |
749 | abort: |
750 | return ret; | |
751 | } | |
752 | ||
753 | /* | |
754 | * validate_super for 0.90.0 | |
755 | */ | |
756 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
757 | { | |
758 | mdp_disk_t *desc; | |
759 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 760 | __u64 ev1 = md_event(sb); |
1da177e4 | 761 | |
41158c7e | 762 | rdev->raid_disk = -1; |
c5d79adb N |
763 | clear_bit(Faulty, &rdev->flags); |
764 | clear_bit(In_sync, &rdev->flags); | |
765 | clear_bit(WriteMostly, &rdev->flags); | |
766 | clear_bit(BarriersNotsupp, &rdev->flags); | |
767 | ||
1da177e4 LT |
768 | if (mddev->raid_disks == 0) { |
769 | mddev->major_version = 0; | |
770 | mddev->minor_version = sb->minor_version; | |
771 | mddev->patch_version = sb->patch_version; | |
e691063a | 772 | mddev->external = 0; |
1da177e4 LT |
773 | mddev->chunk_size = sb->chunk_size; |
774 | mddev->ctime = sb->ctime; | |
775 | mddev->utime = sb->utime; | |
776 | mddev->level = sb->level; | |
d9d166c2 | 777 | mddev->clevel[0] = 0; |
1da177e4 LT |
778 | mddev->layout = sb->layout; |
779 | mddev->raid_disks = sb->raid_disks; | |
780 | mddev->size = sb->size; | |
07d84d10 | 781 | mddev->events = ev1; |
9223214e | 782 | mddev->bitmap_offset = 0; |
36fa3063 | 783 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 784 | |
f6705578 N |
785 | if (mddev->minor_version >= 91) { |
786 | mddev->reshape_position = sb->reshape_position; | |
787 | mddev->delta_disks = sb->delta_disks; | |
788 | mddev->new_level = sb->new_level; | |
789 | mddev->new_layout = sb->new_layout; | |
790 | mddev->new_chunk = sb->new_chunk; | |
791 | } else { | |
792 | mddev->reshape_position = MaxSector; | |
793 | mddev->delta_disks = 0; | |
794 | mddev->new_level = mddev->level; | |
795 | mddev->new_layout = mddev->layout; | |
796 | mddev->new_chunk = mddev->chunk_size; | |
797 | } | |
798 | ||
1da177e4 LT |
799 | if (sb->state & (1<<MD_SB_CLEAN)) |
800 | mddev->recovery_cp = MaxSector; | |
801 | else { | |
802 | if (sb->events_hi == sb->cp_events_hi && | |
803 | sb->events_lo == sb->cp_events_lo) { | |
804 | mddev->recovery_cp = sb->recovery_cp; | |
805 | } else | |
806 | mddev->recovery_cp = 0; | |
807 | } | |
808 | ||
809 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
810 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
811 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
812 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
813 | ||
814 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
815 | |
816 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 817 | mddev->bitmap_file == NULL) |
36fa3063 | 818 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 819 | |
41158c7e N |
820 | } else if (mddev->pers == NULL) { |
821 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
822 | ++ev1; |
823 | if (ev1 < mddev->events) | |
824 | return -EINVAL; | |
41158c7e N |
825 | } else if (mddev->bitmap) { |
826 | /* if adding to array with a bitmap, then we can accept an | |
827 | * older device ... but not too old. | |
828 | */ | |
41158c7e N |
829 | if (ev1 < mddev->bitmap->events_cleared) |
830 | return 0; | |
07d84d10 N |
831 | } else { |
832 | if (ev1 < mddev->events) | |
833 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
834 | return 0; | |
835 | } | |
41158c7e | 836 | |
1da177e4 | 837 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
838 | desc = sb->disks + rdev->desc_nr; |
839 | ||
840 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 841 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
842 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
843 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 844 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
845 | rdev->raid_disk = desc->raid_disk; |
846 | } | |
8ddf9efe N |
847 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
848 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 849 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 850 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
851 | return 0; |
852 | } | |
853 | ||
854 | /* | |
855 | * sync_super for 0.90.0 | |
856 | */ | |
857 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
858 | { | |
859 | mdp_super_t *sb; | |
860 | struct list_head *tmp; | |
861 | mdk_rdev_t *rdev2; | |
862 | int next_spare = mddev->raid_disks; | |
19133a42 | 863 | |
1da177e4 LT |
864 | |
865 | /* make rdev->sb match mddev data.. | |
866 | * | |
867 | * 1/ zero out disks | |
868 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
869 | * 3/ any empty disks < next_spare become removed | |
870 | * | |
871 | * disks[0] gets initialised to REMOVED because | |
872 | * we cannot be sure from other fields if it has | |
873 | * been initialised or not. | |
874 | */ | |
875 | int i; | |
876 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
877 | ||
61181565 N |
878 | rdev->sb_size = MD_SB_BYTES; |
879 | ||
1da177e4 LT |
880 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
881 | ||
882 | memset(sb, 0, sizeof(*sb)); | |
883 | ||
884 | sb->md_magic = MD_SB_MAGIC; | |
885 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
886 | sb->patch_version = mddev->patch_version; |
887 | sb->gvalid_words = 0; /* ignored */ | |
888 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
889 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
890 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
891 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
892 | ||
893 | sb->ctime = mddev->ctime; | |
894 | sb->level = mddev->level; | |
895 | sb->size = mddev->size; | |
896 | sb->raid_disks = mddev->raid_disks; | |
897 | sb->md_minor = mddev->md_minor; | |
e691063a | 898 | sb->not_persistent = 0; |
1da177e4 LT |
899 | sb->utime = mddev->utime; |
900 | sb->state = 0; | |
901 | sb->events_hi = (mddev->events>>32); | |
902 | sb->events_lo = (u32)mddev->events; | |
903 | ||
f6705578 N |
904 | if (mddev->reshape_position == MaxSector) |
905 | sb->minor_version = 90; | |
906 | else { | |
907 | sb->minor_version = 91; | |
908 | sb->reshape_position = mddev->reshape_position; | |
909 | sb->new_level = mddev->new_level; | |
910 | sb->delta_disks = mddev->delta_disks; | |
911 | sb->new_layout = mddev->new_layout; | |
912 | sb->new_chunk = mddev->new_chunk; | |
913 | } | |
914 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
915 | if (mddev->in_sync) |
916 | { | |
917 | sb->recovery_cp = mddev->recovery_cp; | |
918 | sb->cp_events_hi = (mddev->events>>32); | |
919 | sb->cp_events_lo = (u32)mddev->events; | |
920 | if (mddev->recovery_cp == MaxSector) | |
921 | sb->state = (1<< MD_SB_CLEAN); | |
922 | } else | |
923 | sb->recovery_cp = 0; | |
924 | ||
925 | sb->layout = mddev->layout; | |
926 | sb->chunk_size = mddev->chunk_size; | |
927 | ||
a654b9d8 N |
928 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
929 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
930 | ||
1da177e4 | 931 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
d089c6af | 932 | rdev_for_each(rdev2, tmp, mddev) { |
1da177e4 | 933 | mdp_disk_t *d; |
86e6ffdd | 934 | int desc_nr; |
b2d444d7 N |
935 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
936 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 937 | desc_nr = rdev2->raid_disk; |
1da177e4 | 938 | else |
86e6ffdd | 939 | desc_nr = next_spare++; |
19133a42 | 940 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
941 | d = &sb->disks[rdev2->desc_nr]; |
942 | nr_disks++; | |
943 | d->number = rdev2->desc_nr; | |
944 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
945 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
946 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
947 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
948 | d->raid_disk = rdev2->raid_disk; |
949 | else | |
950 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 951 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 952 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 953 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
954 | d->state = (1<<MD_DISK_ACTIVE); |
955 | d->state |= (1<<MD_DISK_SYNC); | |
956 | active++; | |
957 | working++; | |
958 | } else { | |
959 | d->state = 0; | |
960 | spare++; | |
961 | working++; | |
962 | } | |
8ddf9efe N |
963 | if (test_bit(WriteMostly, &rdev2->flags)) |
964 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 965 | } |
1da177e4 LT |
966 | /* now set the "removed" and "faulty" bits on any missing devices */ |
967 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
968 | mdp_disk_t *d = &sb->disks[i]; | |
969 | if (d->state == 0 && d->number == 0) { | |
970 | d->number = i; | |
971 | d->raid_disk = i; | |
972 | d->state = (1<<MD_DISK_REMOVED); | |
973 | d->state |= (1<<MD_DISK_FAULTY); | |
974 | failed++; | |
975 | } | |
976 | } | |
977 | sb->nr_disks = nr_disks; | |
978 | sb->active_disks = active; | |
979 | sb->working_disks = working; | |
980 | sb->failed_disks = failed; | |
981 | sb->spare_disks = spare; | |
982 | ||
983 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
984 | sb->sb_csum = calc_sb_csum(sb); | |
985 | } | |
986 | ||
0cd17fec CW |
987 | /* |
988 | * rdev_size_change for 0.90.0 | |
989 | */ | |
990 | static unsigned long long | |
15f4a5fd | 991 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 992 | { |
15f4a5fd | 993 | if (num_sectors && num_sectors < rdev->mddev->size * 2) |
0cd17fec | 994 | return 0; /* component must fit device */ |
0cd17fec CW |
995 | if (rdev->mddev->bitmap_offset) |
996 | return 0; /* can't move bitmap */ | |
0f420358 | 997 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
998 | if (!num_sectors || num_sectors > rdev->sb_start) |
999 | num_sectors = rdev->sb_start; | |
0f420358 | 1000 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1001 | rdev->sb_page); |
1002 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1003 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1004 | } |
1005 | ||
1006 | ||
1da177e4 LT |
1007 | /* |
1008 | * version 1 superblock | |
1009 | */ | |
1010 | ||
1c05b4bc | 1011 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1012 | { |
1c05b4bc N |
1013 | __le32 disk_csum; |
1014 | u32 csum; | |
1da177e4 LT |
1015 | unsigned long long newcsum; |
1016 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1017 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1018 | int i; |
1019 | ||
1020 | disk_csum = sb->sb_csum; | |
1021 | sb->sb_csum = 0; | |
1022 | newcsum = 0; | |
1023 | for (i=0; size>=4; size -= 4 ) | |
1024 | newcsum += le32_to_cpu(*isuper++); | |
1025 | ||
1026 | if (size == 2) | |
1c05b4bc | 1027 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1028 | |
1029 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1030 | sb->sb_csum = disk_csum; | |
1031 | return cpu_to_le32(csum); | |
1032 | } | |
1033 | ||
1034 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1035 | { | |
1036 | struct mdp_superblock_1 *sb; | |
1037 | int ret; | |
0f420358 | 1038 | sector_t sb_start; |
1da177e4 | 1039 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1040 | int bmask; |
1da177e4 LT |
1041 | |
1042 | /* | |
0f420358 | 1043 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1044 | * It is always aligned to a 4K boundary and |
1045 | * depeding on minor_version, it can be: | |
1046 | * 0: At least 8K, but less than 12K, from end of device | |
1047 | * 1: At start of device | |
1048 | * 2: 4K from start of device. | |
1049 | */ | |
1050 | switch(minor_version) { | |
1051 | case 0: | |
0f420358 AN |
1052 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1053 | sb_start -= 8*2; | |
1054 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1055 | break; |
1056 | case 1: | |
0f420358 | 1057 | sb_start = 0; |
1da177e4 LT |
1058 | break; |
1059 | case 2: | |
0f420358 | 1060 | sb_start = 8; |
1da177e4 LT |
1061 | break; |
1062 | default: | |
1063 | return -EINVAL; | |
1064 | } | |
0f420358 | 1065 | rdev->sb_start = sb_start; |
1da177e4 | 1066 | |
0002b271 N |
1067 | /* superblock is rarely larger than 1K, but it can be larger, |
1068 | * and it is safe to read 4k, so we do that | |
1069 | */ | |
1070 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1071 | if (ret) return ret; |
1072 | ||
1073 | ||
1074 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1075 | ||
1076 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1077 | sb->major_version != cpu_to_le32(1) || | |
1078 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1079 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1080 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1081 | return -EINVAL; |
1082 | ||
1083 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1084 | printk("md: invalid superblock checksum on %s\n", | |
1085 | bdevname(rdev->bdev,b)); | |
1086 | return -EINVAL; | |
1087 | } | |
1088 | if (le64_to_cpu(sb->data_size) < 10) { | |
1089 | printk("md: data_size too small on %s\n", | |
1090 | bdevname(rdev->bdev,b)); | |
1091 | return -EINVAL; | |
1092 | } | |
e11e93fa N |
1093 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1094 | if (sb->level != cpu_to_le32(1) && | |
1095 | sb->level != cpu_to_le32(4) && | |
1096 | sb->level != cpu_to_le32(5) && | |
1097 | sb->level != cpu_to_le32(6) && | |
1098 | sb->level != cpu_to_le32(10)) { | |
1099 | printk(KERN_WARNING | |
1100 | "md: bitmaps not supported for this level.\n"); | |
1101 | return -EINVAL; | |
1102 | } | |
1103 | } | |
1104 | ||
1da177e4 LT |
1105 | rdev->preferred_minor = 0xffff; |
1106 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1107 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1108 | |
0002b271 | 1109 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1110 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1111 | if (rdev->sb_size & bmask) |
a1801f85 N |
1112 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1113 | ||
1114 | if (minor_version | |
0f420358 | 1115 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1116 | return -EINVAL; |
0002b271 | 1117 | |
31b65a0d N |
1118 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1119 | rdev->desc_nr = -1; | |
1120 | else | |
1121 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1122 | ||
9a7b2b0f | 1123 | if (!refdev) { |
8ed75463 | 1124 | ret = 1; |
9a7b2b0f | 1125 | } else { |
1da177e4 LT |
1126 | __u64 ev1, ev2; |
1127 | struct mdp_superblock_1 *refsb = | |
1128 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1129 | ||
1130 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1131 | sb->level != refsb->level || | |
1132 | sb->layout != refsb->layout || | |
1133 | sb->chunksize != refsb->chunksize) { | |
1134 | printk(KERN_WARNING "md: %s has strangely different" | |
1135 | " superblock to %s\n", | |
1136 | bdevname(rdev->bdev,b), | |
1137 | bdevname(refdev->bdev,b2)); | |
1138 | return -EINVAL; | |
1139 | } | |
1140 | ev1 = le64_to_cpu(sb->events); | |
1141 | ev2 = le64_to_cpu(refsb->events); | |
1142 | ||
1143 | if (ev1 > ev2) | |
8ed75463 N |
1144 | ret = 1; |
1145 | else | |
1146 | ret = 0; | |
1da177e4 | 1147 | } |
a1801f85 | 1148 | if (minor_version) |
1da177e4 LT |
1149 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; |
1150 | else | |
0f420358 | 1151 | rdev->size = rdev->sb_start / 2; |
1da177e4 LT |
1152 | if (rdev->size < le64_to_cpu(sb->data_size)/2) |
1153 | return -EINVAL; | |
1154 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1155 | if (le32_to_cpu(sb->chunksize)) | |
1156 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1157 | |
1c05b4bc | 1158 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1159 | return -EINVAL; |
8ed75463 | 1160 | return ret; |
1da177e4 LT |
1161 | } |
1162 | ||
1163 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1164 | { | |
1165 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1166 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1167 | |
41158c7e | 1168 | rdev->raid_disk = -1; |
c5d79adb N |
1169 | clear_bit(Faulty, &rdev->flags); |
1170 | clear_bit(In_sync, &rdev->flags); | |
1171 | clear_bit(WriteMostly, &rdev->flags); | |
1172 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1173 | ||
1da177e4 LT |
1174 | if (mddev->raid_disks == 0) { |
1175 | mddev->major_version = 1; | |
1176 | mddev->patch_version = 0; | |
e691063a | 1177 | mddev->external = 0; |
1da177e4 LT |
1178 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1179 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1180 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1181 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1182 | mddev->clevel[0] = 0; |
1da177e4 LT |
1183 | mddev->layout = le32_to_cpu(sb->layout); |
1184 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1185 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1186 | mddev->events = ev1; |
9223214e | 1187 | mddev->bitmap_offset = 0; |
29fc7e3e | 1188 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1189 | |
1190 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1191 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1192 | ||
1193 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1194 | |
71c0805c | 1195 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1196 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1197 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1198 | |
f6705578 N |
1199 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1200 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1201 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1202 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1203 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1204 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1205 | } else { | |
1206 | mddev->reshape_position = MaxSector; | |
1207 | mddev->delta_disks = 0; | |
1208 | mddev->new_level = mddev->level; | |
1209 | mddev->new_layout = mddev->layout; | |
1210 | mddev->new_chunk = mddev->chunk_size; | |
1211 | } | |
1212 | ||
41158c7e N |
1213 | } else if (mddev->pers == NULL) { |
1214 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1215 | ++ev1; |
1216 | if (ev1 < mddev->events) | |
1217 | return -EINVAL; | |
41158c7e N |
1218 | } else if (mddev->bitmap) { |
1219 | /* If adding to array with a bitmap, then we can accept an | |
1220 | * older device, but not too old. | |
1221 | */ | |
41158c7e N |
1222 | if (ev1 < mddev->bitmap->events_cleared) |
1223 | return 0; | |
07d84d10 N |
1224 | } else { |
1225 | if (ev1 < mddev->events) | |
1226 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1227 | return 0; | |
1228 | } | |
1da177e4 LT |
1229 | if (mddev->level != LEVEL_MULTIPATH) { |
1230 | int role; | |
1da177e4 LT |
1231 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1232 | switch(role) { | |
1233 | case 0xffff: /* spare */ | |
1da177e4 LT |
1234 | break; |
1235 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1236 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1237 | break; |
1238 | default: | |
5fd6c1dc N |
1239 | if ((le32_to_cpu(sb->feature_map) & |
1240 | MD_FEATURE_RECOVERY_OFFSET)) | |
1241 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1242 | else | |
1243 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1244 | rdev->raid_disk = role; |
1245 | break; | |
1246 | } | |
8ddf9efe N |
1247 | if (sb->devflags & WriteMostly1) |
1248 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1249 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1250 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1251 | |
1da177e4 LT |
1252 | return 0; |
1253 | } | |
1254 | ||
1255 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1256 | { | |
1257 | struct mdp_superblock_1 *sb; | |
1258 | struct list_head *tmp; | |
1259 | mdk_rdev_t *rdev2; | |
1260 | int max_dev, i; | |
1261 | /* make rdev->sb match mddev and rdev data. */ | |
1262 | ||
1263 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1264 | ||
1265 | sb->feature_map = 0; | |
1266 | sb->pad0 = 0; | |
5fd6c1dc | 1267 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1268 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1269 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1270 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1271 | ||
1272 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1273 | sb->events = cpu_to_le64(mddev->events); | |
1274 | if (mddev->in_sync) | |
1275 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1276 | else | |
1277 | sb->resync_offset = cpu_to_le64(0); | |
1278 | ||
1c05b4bc | 1279 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1280 | |
f0ca340c | 1281 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1282 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1283 | |
a654b9d8 N |
1284 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1285 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1286 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1287 | } |
5fd6c1dc N |
1288 | |
1289 | if (rdev->raid_disk >= 0 && | |
1290 | !test_bit(In_sync, &rdev->flags) && | |
1291 | rdev->recovery_offset > 0) { | |
1292 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1293 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1294 | } | |
1295 | ||
f6705578 N |
1296 | if (mddev->reshape_position != MaxSector) { |
1297 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1298 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1299 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1300 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1301 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1302 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1303 | } | |
a654b9d8 | 1304 | |
1da177e4 | 1305 | max_dev = 0; |
d089c6af | 1306 | rdev_for_each(rdev2, tmp, mddev) |
1da177e4 LT |
1307 | if (rdev2->desc_nr+1 > max_dev) |
1308 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1309 | |
1310 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1311 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1312 | for (i=0; i<max_dev;i++) |
1313 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1314 | ||
d089c6af | 1315 | rdev_for_each(rdev2, tmp, mddev) { |
1da177e4 | 1316 | i = rdev2->desc_nr; |
b2d444d7 | 1317 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1318 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1319 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1320 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1321 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1322 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1323 | else |
1324 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1325 | } | |
1326 | ||
1da177e4 LT |
1327 | sb->sb_csum = calc_sb_1_csum(sb); |
1328 | } | |
1329 | ||
0cd17fec | 1330 | static unsigned long long |
15f4a5fd | 1331 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1332 | { |
1333 | struct mdp_superblock_1 *sb; | |
15f4a5fd AN |
1334 | sector_t max_sectors; |
1335 | if (num_sectors && num_sectors < rdev->mddev->size * 2) | |
0cd17fec | 1336 | return 0; /* component must fit device */ |
0f420358 | 1337 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1338 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1339 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1340 | max_sectors -= rdev->data_offset; | |
1341 | if (!num_sectors || num_sectors > max_sectors) | |
1342 | num_sectors = max_sectors; | |
0cd17fec CW |
1343 | } else if (rdev->mddev->bitmap_offset) { |
1344 | /* minor version 0 with bitmap we can't move */ | |
1345 | return 0; | |
1346 | } else { | |
1347 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1348 | sector_t sb_start; |
1349 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1350 | sb_start &= ~(sector_t)(4*2 - 1); | |
15f4a5fd AN |
1351 | max_sectors = rdev->size * 2 + sb_start - rdev->sb_start; |
1352 | if (!num_sectors || num_sectors > max_sectors) | |
1353 | num_sectors = max_sectors; | |
0f420358 | 1354 | rdev->sb_start = sb_start; |
0cd17fec CW |
1355 | } |
1356 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1357 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1358 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1359 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1360 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1361 | rdev->sb_page); |
1362 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1363 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1364 | } |
1da177e4 | 1365 | |
75c96f85 | 1366 | static struct super_type super_types[] = { |
1da177e4 LT |
1367 | [0] = { |
1368 | .name = "0.90.0", | |
1369 | .owner = THIS_MODULE, | |
0cd17fec CW |
1370 | .load_super = super_90_load, |
1371 | .validate_super = super_90_validate, | |
1372 | .sync_super = super_90_sync, | |
1373 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1374 | }, |
1375 | [1] = { | |
1376 | .name = "md-1", | |
1377 | .owner = THIS_MODULE, | |
0cd17fec CW |
1378 | .load_super = super_1_load, |
1379 | .validate_super = super_1_validate, | |
1380 | .sync_super = super_1_sync, | |
1381 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1382 | }, |
1383 | }; | |
1da177e4 LT |
1384 | |
1385 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1386 | { | |
7dd5e7c3 | 1387 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1388 | |
4b80991c N |
1389 | rcu_read_lock(); |
1390 | rdev_for_each_rcu(rdev, mddev1) | |
1391 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1392 | if (rdev->bdev->bd_contains == |
4b80991c N |
1393 | rdev2->bdev->bd_contains) { |
1394 | rcu_read_unlock(); | |
7dd5e7c3 | 1395 | return 1; |
4b80991c N |
1396 | } |
1397 | rcu_read_unlock(); | |
1da177e4 LT |
1398 | return 0; |
1399 | } | |
1400 | ||
1401 | static LIST_HEAD(pending_raid_disks); | |
1402 | ||
1403 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1404 | { | |
7dd5e7c3 | 1405 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1406 | struct kobject *ko; |
1edf80d3 | 1407 | char *s; |
5e55e2f5 | 1408 | int err; |
1da177e4 LT |
1409 | |
1410 | if (rdev->mddev) { | |
1411 | MD_BUG(); | |
1412 | return -EINVAL; | |
1413 | } | |
11e2ede0 DW |
1414 | |
1415 | /* prevent duplicates */ | |
1416 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1417 | return -EEXIST; | |
1418 | ||
2bf071bf N |
1419 | /* make sure rdev->size exceeds mddev->size */ |
1420 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1421 | if (mddev->pers) { |
1422 | /* Cannot change size, so fail | |
1423 | * If mddev->level <= 0, then we don't care | |
1424 | * about aligning sizes (e.g. linear) | |
1425 | */ | |
1426 | if (mddev->level > 0) | |
1427 | return -ENOSPC; | |
1428 | } else | |
2bf071bf N |
1429 | mddev->size = rdev->size; |
1430 | } | |
1da177e4 LT |
1431 | |
1432 | /* Verify rdev->desc_nr is unique. | |
1433 | * If it is -1, assign a free number, else | |
1434 | * check number is not in use | |
1435 | */ | |
1436 | if (rdev->desc_nr < 0) { | |
1437 | int choice = 0; | |
1438 | if (mddev->pers) choice = mddev->raid_disks; | |
1439 | while (find_rdev_nr(mddev, choice)) | |
1440 | choice++; | |
1441 | rdev->desc_nr = choice; | |
1442 | } else { | |
1443 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1444 | return -EBUSY; | |
1445 | } | |
19133a42 | 1446 | bdevname(rdev->bdev,b); |
649316b2 | 1447 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1448 | *s = '!'; |
649316b2 | 1449 | |
1da177e4 | 1450 | rdev->mddev = mddev; |
19133a42 | 1451 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1452 | |
b2d6db58 | 1453 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1454 | goto fail; |
86e6ffdd | 1455 | |
0762b8bd | 1456 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1457 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1458 | kobject_del(&rdev->kobj); | |
1459 | goto fail; | |
1460 | } | |
4b80991c | 1461 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1462 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
1da177e4 | 1463 | return 0; |
5e55e2f5 N |
1464 | |
1465 | fail: | |
1466 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1467 | b, mdname(mddev)); | |
1468 | return err; | |
1da177e4 LT |
1469 | } |
1470 | ||
177a99b2 | 1471 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1472 | { |
1473 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1474 | kobject_del(&rdev->kobj); | |
177a99b2 | 1475 | kobject_put(&rdev->kobj); |
5792a285 N |
1476 | } |
1477 | ||
1da177e4 LT |
1478 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1479 | { | |
1480 | char b[BDEVNAME_SIZE]; | |
1481 | if (!rdev->mddev) { | |
1482 | MD_BUG(); | |
1483 | return; | |
1484 | } | |
5463c790 | 1485 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1486 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1487 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1488 | rdev->mddev = NULL; | |
86e6ffdd | 1489 | sysfs_remove_link(&rdev->kobj, "block"); |
5792a285 N |
1490 | |
1491 | /* We need to delay this, otherwise we can deadlock when | |
4b80991c N |
1492 | * writing to 'remove' to "dev/state". We also need |
1493 | * to delay it due to rcu usage. | |
5792a285 | 1494 | */ |
4b80991c | 1495 | synchronize_rcu(); |
177a99b2 N |
1496 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1497 | kobject_get(&rdev->kobj); | |
5792a285 | 1498 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1499 | } |
1500 | ||
1501 | /* | |
1502 | * prevent the device from being mounted, repartitioned or | |
1503 | * otherwise reused by a RAID array (or any other kernel | |
1504 | * subsystem), by bd_claiming the device. | |
1505 | */ | |
c5d79adb | 1506 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1507 | { |
1508 | int err = 0; | |
1509 | struct block_device *bdev; | |
1510 | char b[BDEVNAME_SIZE]; | |
1511 | ||
2e7b651d | 1512 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1513 | if (IS_ERR(bdev)) { |
1514 | printk(KERN_ERR "md: could not open %s.\n", | |
1515 | __bdevname(dev, b)); | |
1516 | return PTR_ERR(bdev); | |
1517 | } | |
c5d79adb | 1518 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1519 | if (err) { |
1520 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1521 | bdevname(bdev, b)); | |
2e7b651d | 1522 | blkdev_put(bdev); |
1da177e4 LT |
1523 | return err; |
1524 | } | |
c5d79adb N |
1525 | if (!shared) |
1526 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1527 | rdev->bdev = bdev; |
1528 | return err; | |
1529 | } | |
1530 | ||
1531 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1532 | { | |
1533 | struct block_device *bdev = rdev->bdev; | |
1534 | rdev->bdev = NULL; | |
1535 | if (!bdev) | |
1536 | MD_BUG(); | |
1537 | bd_release(bdev); | |
2e7b651d | 1538 | blkdev_put(bdev); |
1da177e4 LT |
1539 | } |
1540 | ||
1541 | void md_autodetect_dev(dev_t dev); | |
1542 | ||
1543 | static void export_rdev(mdk_rdev_t * rdev) | |
1544 | { | |
1545 | char b[BDEVNAME_SIZE]; | |
1546 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1547 | bdevname(rdev->bdev,b)); | |
1548 | if (rdev->mddev) | |
1549 | MD_BUG(); | |
1550 | free_disk_sb(rdev); | |
1da177e4 | 1551 | #ifndef MODULE |
d0fae18f N |
1552 | if (test_bit(AutoDetected, &rdev->flags)) |
1553 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1554 | #endif |
1555 | unlock_rdev(rdev); | |
86e6ffdd | 1556 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1557 | } |
1558 | ||
1559 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1560 | { | |
1561 | unbind_rdev_from_array(rdev); | |
1562 | export_rdev(rdev); | |
1563 | } | |
1564 | ||
1565 | static void export_array(mddev_t *mddev) | |
1566 | { | |
1567 | struct list_head *tmp; | |
1568 | mdk_rdev_t *rdev; | |
1569 | ||
d089c6af | 1570 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1571 | if (!rdev->mddev) { |
1572 | MD_BUG(); | |
1573 | continue; | |
1574 | } | |
1575 | kick_rdev_from_array(rdev); | |
1576 | } | |
1577 | if (!list_empty(&mddev->disks)) | |
1578 | MD_BUG(); | |
1579 | mddev->raid_disks = 0; | |
1580 | mddev->major_version = 0; | |
1581 | } | |
1582 | ||
1583 | static void print_desc(mdp_disk_t *desc) | |
1584 | { | |
1585 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1586 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1587 | } | |
1588 | ||
1589 | static void print_sb(mdp_super_t *sb) | |
1590 | { | |
1591 | int i; | |
1592 | ||
1593 | printk(KERN_INFO | |
1594 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1595 | sb->major_version, sb->minor_version, sb->patch_version, | |
1596 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1597 | sb->ctime); | |
1598 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1599 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1600 | sb->md_minor, sb->layout, sb->chunk_size); | |
1601 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1602 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1603 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1604 | sb->failed_disks, sb->spare_disks, | |
1605 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1606 | ||
1607 | printk(KERN_INFO); | |
1608 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1609 | mdp_disk_t *desc; | |
1610 | ||
1611 | desc = sb->disks + i; | |
1612 | if (desc->number || desc->major || desc->minor || | |
1613 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1614 | printk(" D %2d: ", i); | |
1615 | print_desc(desc); | |
1616 | } | |
1617 | } | |
1618 | printk(KERN_INFO "md: THIS: "); | |
1619 | print_desc(&sb->this_disk); | |
1620 | ||
1621 | } | |
1622 | ||
1623 | static void print_rdev(mdk_rdev_t *rdev) | |
1624 | { | |
1625 | char b[BDEVNAME_SIZE]; | |
1626 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1627 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1628 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1629 | rdev->desc_nr); | |
1da177e4 LT |
1630 | if (rdev->sb_loaded) { |
1631 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1632 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1633 | } else | |
1634 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1635 | } | |
1636 | ||
5e56341d | 1637 | static void md_print_devices(void) |
1da177e4 LT |
1638 | { |
1639 | struct list_head *tmp, *tmp2; | |
1640 | mdk_rdev_t *rdev; | |
1641 | mddev_t *mddev; | |
1642 | char b[BDEVNAME_SIZE]; | |
1643 | ||
1644 | printk("\n"); | |
1645 | printk("md: **********************************\n"); | |
1646 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1647 | printk("md: **********************************\n"); | |
29ac4aa3 | 1648 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1649 | |
32a7627c N |
1650 | if (mddev->bitmap) |
1651 | bitmap_print_sb(mddev->bitmap); | |
1652 | else | |
1653 | printk("%s: ", mdname(mddev)); | |
d089c6af | 1654 | rdev_for_each(rdev, tmp2, mddev) |
1da177e4 LT |
1655 | printk("<%s>", bdevname(rdev->bdev,b)); |
1656 | printk("\n"); | |
1657 | ||
d089c6af | 1658 | rdev_for_each(rdev, tmp2, mddev) |
1da177e4 LT |
1659 | print_rdev(rdev); |
1660 | } | |
1661 | printk("md: **********************************\n"); | |
1662 | printk("\n"); | |
1663 | } | |
1664 | ||
1665 | ||
42543769 | 1666 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1667 | { |
42543769 N |
1668 | /* Update each superblock (in-memory image), but |
1669 | * if we are allowed to, skip spares which already | |
1670 | * have the right event counter, or have one earlier | |
1671 | * (which would mean they aren't being marked as dirty | |
1672 | * with the rest of the array) | |
1673 | */ | |
1da177e4 LT |
1674 | mdk_rdev_t *rdev; |
1675 | struct list_head *tmp; | |
1676 | ||
d089c6af | 1677 | rdev_for_each(rdev, tmp, mddev) { |
42543769 N |
1678 | if (rdev->sb_events == mddev->events || |
1679 | (nospares && | |
1680 | rdev->raid_disk < 0 && | |
1681 | (rdev->sb_events&1)==0 && | |
1682 | rdev->sb_events+1 == mddev->events)) { | |
1683 | /* Don't update this superblock */ | |
1684 | rdev->sb_loaded = 2; | |
1685 | } else { | |
1686 | super_types[mddev->major_version]. | |
1687 | sync_super(mddev, rdev); | |
1688 | rdev->sb_loaded = 1; | |
1689 | } | |
1da177e4 LT |
1690 | } |
1691 | } | |
1692 | ||
850b2b42 | 1693 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1694 | { |
1da177e4 LT |
1695 | struct list_head *tmp; |
1696 | mdk_rdev_t *rdev; | |
06d91a5f | 1697 | int sync_req; |
42543769 | 1698 | int nospares = 0; |
1da177e4 | 1699 | |
8377bc80 N |
1700 | if (mddev->external) |
1701 | return; | |
1da177e4 | 1702 | repeat: |
a9701a30 | 1703 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1704 | |
850b2b42 N |
1705 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1706 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1707 | force_change = 1; | |
1708 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1709 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1710 | * though if events isn't the right even/odd, we will have to do | |
1711 | * spares after all | |
1712 | */ | |
1713 | nospares = 1; | |
1714 | if (force_change) | |
1715 | nospares = 0; | |
1716 | if (mddev->degraded) | |
84692195 N |
1717 | /* If the array is degraded, then skipping spares is both |
1718 | * dangerous and fairly pointless. | |
1719 | * Dangerous because a device that was removed from the array | |
1720 | * might have a event_count that still looks up-to-date, | |
1721 | * so it can be re-added without a resync. | |
1722 | * Pointless because if there are any spares to skip, | |
1723 | * then a recovery will happen and soon that array won't | |
1724 | * be degraded any more and the spare can go back to sleep then. | |
1725 | */ | |
850b2b42 | 1726 | nospares = 0; |
84692195 | 1727 | |
06d91a5f | 1728 | sync_req = mddev->in_sync; |
1da177e4 | 1729 | mddev->utime = get_seconds(); |
42543769 N |
1730 | |
1731 | /* If this is just a dirty<->clean transition, and the array is clean | |
1732 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1733 | if (nospares |
42543769 | 1734 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1735 | && (mddev->events & 1) |
1736 | && mddev->events != 1) | |
42543769 N |
1737 | mddev->events--; |
1738 | else { | |
1739 | /* otherwise we have to go forward and ... */ | |
1740 | mddev->events ++; | |
1741 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1742 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1743 | if ((mddev->events&1)==0) { | |
1744 | mddev->events++; | |
1745 | nospares = 0; | |
1746 | } | |
1747 | } else { | |
1748 | /* otherwise insist on an even 'events' (for clean states) */ | |
1749 | if ((mddev->events&1)) { | |
1750 | mddev->events++; | |
1751 | nospares = 0; | |
1752 | } | |
1753 | } | |
1754 | } | |
1da177e4 LT |
1755 | |
1756 | if (!mddev->events) { | |
1757 | /* | |
1758 | * oops, this 64-bit counter should never wrap. | |
1759 | * Either we are in around ~1 trillion A.C., assuming | |
1760 | * 1 reboot per second, or we have a bug: | |
1761 | */ | |
1762 | MD_BUG(); | |
1763 | mddev->events --; | |
1764 | } | |
1da177e4 LT |
1765 | |
1766 | /* | |
1767 | * do not write anything to disk if using | |
1768 | * nonpersistent superblocks | |
1769 | */ | |
06d91a5f | 1770 | if (!mddev->persistent) { |
e691063a N |
1771 | if (!mddev->external) |
1772 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1773 | ||
a9701a30 | 1774 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1775 | wake_up(&mddev->sb_wait); |
1da177e4 | 1776 | return; |
06d91a5f | 1777 | } |
e691063a | 1778 | sync_sbs(mddev, nospares); |
a9701a30 | 1779 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1780 | |
1781 | dprintk(KERN_INFO | |
1782 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1783 | mdname(mddev),mddev->in_sync); | |
1784 | ||
4ad13663 | 1785 | bitmap_update_sb(mddev->bitmap); |
d089c6af | 1786 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1787 | char b[BDEVNAME_SIZE]; |
1788 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1789 | if (rdev->sb_loaded != 1) |
1790 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1791 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1792 | dprintk("(skipping faulty "); |
1793 | ||
1794 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1795 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1796 | md_super_write(mddev,rdev, |
0f420358 | 1797 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
1798 | rdev->sb_page); |
1799 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1800 | bdevname(rdev->bdev,b), | |
0f420358 | 1801 | (unsigned long long)rdev->sb_start); |
42543769 | 1802 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1803 | |
1da177e4 LT |
1804 | } else |
1805 | dprintk(")\n"); | |
7bfa19f2 | 1806 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1807 | /* only need to write one superblock... */ |
1808 | break; | |
1809 | } | |
a9701a30 | 1810 | md_super_wait(mddev); |
850b2b42 | 1811 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1812 | |
a9701a30 | 1813 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1814 | if (mddev->in_sync != sync_req || |
1815 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1816 | /* have to write it out again */ |
a9701a30 | 1817 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1818 | goto repeat; |
1819 | } | |
850b2b42 | 1820 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1821 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1822 | wake_up(&mddev->sb_wait); |
06d91a5f | 1823 | |
1da177e4 LT |
1824 | } |
1825 | ||
7f6ce769 | 1826 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
1827 | * We want to accept with case. For this we use cmd_match. |
1828 | */ | |
1829 | static int cmd_match(const char *cmd, const char *str) | |
1830 | { | |
1831 | /* See if cmd, written into a sysfs file, matches | |
1832 | * str. They must either be the same, or cmd can | |
1833 | * have a trailing newline | |
1834 | */ | |
1835 | while (*cmd && *str && *cmd == *str) { | |
1836 | cmd++; | |
1837 | str++; | |
1838 | } | |
1839 | if (*cmd == '\n') | |
1840 | cmd++; | |
1841 | if (*str || *cmd) | |
1842 | return 0; | |
1843 | return 1; | |
1844 | } | |
1845 | ||
86e6ffdd N |
1846 | struct rdev_sysfs_entry { |
1847 | struct attribute attr; | |
1848 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1849 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1850 | }; | |
1851 | ||
1852 | static ssize_t | |
96de1e66 | 1853 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1854 | { |
1855 | char *sep = ""; | |
20a49ff6 | 1856 | size_t len = 0; |
86e6ffdd | 1857 | |
b2d444d7 | 1858 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1859 | len+= sprintf(page+len, "%sfaulty",sep); |
1860 | sep = ","; | |
1861 | } | |
b2d444d7 | 1862 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1863 | len += sprintf(page+len, "%sin_sync",sep); |
1864 | sep = ","; | |
1865 | } | |
f655675b N |
1866 | if (test_bit(WriteMostly, &rdev->flags)) { |
1867 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1868 | sep = ","; | |
1869 | } | |
6bfe0b49 DW |
1870 | if (test_bit(Blocked, &rdev->flags)) { |
1871 | len += sprintf(page+len, "%sblocked", sep); | |
1872 | sep = ","; | |
1873 | } | |
b2d444d7 N |
1874 | if (!test_bit(Faulty, &rdev->flags) && |
1875 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1876 | len += sprintf(page+len, "%sspare", sep); |
1877 | sep = ","; | |
1878 | } | |
1879 | return len+sprintf(page+len, "\n"); | |
1880 | } | |
1881 | ||
45dc2de1 N |
1882 | static ssize_t |
1883 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1884 | { | |
1885 | /* can write | |
1886 | * faulty - simulates and error | |
1887 | * remove - disconnects the device | |
f655675b N |
1888 | * writemostly - sets write_mostly |
1889 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
1890 | * blocked - sets the Blocked flag |
1891 | * -blocked - clears the Blocked flag | |
45dc2de1 N |
1892 | */ |
1893 | int err = -EINVAL; | |
1894 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1895 | md_error(rdev->mddev, rdev); | |
1896 | err = 0; | |
1897 | } else if (cmd_match(buf, "remove")) { | |
1898 | if (rdev->raid_disk >= 0) | |
1899 | err = -EBUSY; | |
1900 | else { | |
1901 | mddev_t *mddev = rdev->mddev; | |
1902 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1903 | if (mddev->pers) |
1904 | md_update_sb(mddev, 1); | |
45dc2de1 N |
1905 | md_new_event(mddev); |
1906 | err = 0; | |
1907 | } | |
f655675b N |
1908 | } else if (cmd_match(buf, "writemostly")) { |
1909 | set_bit(WriteMostly, &rdev->flags); | |
1910 | err = 0; | |
1911 | } else if (cmd_match(buf, "-writemostly")) { | |
1912 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
1913 | err = 0; |
1914 | } else if (cmd_match(buf, "blocked")) { | |
1915 | set_bit(Blocked, &rdev->flags); | |
1916 | err = 0; | |
1917 | } else if (cmd_match(buf, "-blocked")) { | |
1918 | clear_bit(Blocked, &rdev->flags); | |
1919 | wake_up(&rdev->blocked_wait); | |
1920 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
1921 | md_wakeup_thread(rdev->mddev->thread); | |
1922 | ||
f655675b | 1923 | err = 0; |
45dc2de1 | 1924 | } |
52664732 NB |
1925 | if (!err) |
1926 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
45dc2de1 N |
1927 | return err ? err : len; |
1928 | } | |
80ca3a44 N |
1929 | static struct rdev_sysfs_entry rdev_state = |
1930 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 1931 | |
4dbcdc75 N |
1932 | static ssize_t |
1933 | errors_show(mdk_rdev_t *rdev, char *page) | |
1934 | { | |
1935 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1936 | } | |
1937 | ||
1938 | static ssize_t | |
1939 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1940 | { | |
1941 | char *e; | |
1942 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1943 | if (*buf && (*e == 0 || *e == '\n')) { | |
1944 | atomic_set(&rdev->corrected_errors, n); | |
1945 | return len; | |
1946 | } | |
1947 | return -EINVAL; | |
1948 | } | |
1949 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 1950 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 1951 | |
014236d2 N |
1952 | static ssize_t |
1953 | slot_show(mdk_rdev_t *rdev, char *page) | |
1954 | { | |
1955 | if (rdev->raid_disk < 0) | |
1956 | return sprintf(page, "none\n"); | |
1957 | else | |
1958 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1959 | } | |
1960 | ||
1961 | static ssize_t | |
1962 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1963 | { | |
1964 | char *e; | |
c303da6d N |
1965 | int err; |
1966 | char nm[20]; | |
014236d2 N |
1967 | int slot = simple_strtoul(buf, &e, 10); |
1968 | if (strncmp(buf, "none", 4)==0) | |
1969 | slot = -1; | |
1970 | else if (e==buf || (*e && *e!= '\n')) | |
1971 | return -EINVAL; | |
6c2fce2e | 1972 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
1973 | /* Setting 'slot' on an active array requires also |
1974 | * updating the 'rd%d' link, and communicating | |
1975 | * with the personality with ->hot_*_disk. | |
1976 | * For now we only support removing | |
1977 | * failed/spare devices. This normally happens automatically, | |
1978 | * but not when the metadata is externally managed. | |
1979 | */ | |
c303da6d N |
1980 | if (rdev->raid_disk == -1) |
1981 | return -EEXIST; | |
1982 | /* personality does all needed checks */ | |
1983 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
1984 | return -EINVAL; | |
1985 | err = rdev->mddev->pers-> | |
1986 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
1987 | if (err) | |
1988 | return err; | |
1989 | sprintf(nm, "rd%d", rdev->raid_disk); | |
1990 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
1991 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
1992 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
1993 | } else if (rdev->mddev->pers) { |
1994 | mdk_rdev_t *rdev2; | |
1995 | struct list_head *tmp; | |
1996 | /* Activating a spare .. or possibly reactivating | |
1997 | * if we every get bitmaps working here. | |
1998 | */ | |
1999 | ||
2000 | if (rdev->raid_disk != -1) | |
2001 | return -EBUSY; | |
2002 | ||
2003 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2004 | return -EINVAL; | |
2005 | ||
2006 | rdev_for_each(rdev2, tmp, rdev->mddev) | |
2007 | if (rdev2->raid_disk == slot) | |
2008 | return -EEXIST; | |
2009 | ||
2010 | rdev->raid_disk = slot; | |
2011 | if (test_bit(In_sync, &rdev->flags)) | |
2012 | rdev->saved_raid_disk = slot; | |
2013 | else | |
2014 | rdev->saved_raid_disk = -1; | |
2015 | err = rdev->mddev->pers-> | |
2016 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2017 | if (err) { |
6c2fce2e | 2018 | rdev->raid_disk = -1; |
6c2fce2e | 2019 | return err; |
52664732 NB |
2020 | } else |
2021 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
6c2fce2e NB |
2022 | sprintf(nm, "rd%d", rdev->raid_disk); |
2023 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2024 | printk(KERN_WARNING | |
2025 | "md: cannot register " | |
2026 | "%s for %s\n", | |
2027 | nm, mdname(rdev->mddev)); | |
2028 | ||
2029 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2030 | } else { |
2031 | if (slot >= rdev->mddev->raid_disks) | |
2032 | return -ENOSPC; | |
2033 | rdev->raid_disk = slot; | |
2034 | /* assume it is working */ | |
c5d79adb N |
2035 | clear_bit(Faulty, &rdev->flags); |
2036 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2037 | set_bit(In_sync, &rdev->flags); |
52664732 | 2038 | sysfs_notify(&rdev->kobj, NULL, "state"); |
c303da6d | 2039 | } |
014236d2 N |
2040 | return len; |
2041 | } | |
2042 | ||
2043 | ||
2044 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2045 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2046 | |
93c8cad0 N |
2047 | static ssize_t |
2048 | offset_show(mdk_rdev_t *rdev, char *page) | |
2049 | { | |
6961ece4 | 2050 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2051 | } |
2052 | ||
2053 | static ssize_t | |
2054 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2055 | { | |
2056 | char *e; | |
2057 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2058 | if (e==buf || (*e && *e != '\n')) | |
2059 | return -EINVAL; | |
8ed0a521 | 2060 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2061 | return -EBUSY; |
c5d79adb N |
2062 | if (rdev->size && rdev->mddev->external) |
2063 | /* Must set offset before size, so overlap checks | |
2064 | * can be sane */ | |
2065 | return -EBUSY; | |
93c8cad0 N |
2066 | rdev->data_offset = offset; |
2067 | return len; | |
2068 | } | |
2069 | ||
2070 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2071 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2072 | |
83303b61 N |
2073 | static ssize_t |
2074 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2075 | { | |
2076 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
2077 | } | |
2078 | ||
c5d79adb N |
2079 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2080 | { | |
2081 | /* check if two start/length pairs overlap */ | |
2082 | if (s1+l1 <= s2) | |
2083 | return 0; | |
2084 | if (s2+l2 <= s1) | |
2085 | return 0; | |
2086 | return 1; | |
2087 | } | |
2088 | ||
83303b61 N |
2089 | static ssize_t |
2090 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2091 | { | |
d7027458 | 2092 | unsigned long long size; |
c5d79adb | 2093 | unsigned long long oldsize = rdev->size; |
27c529bb N |
2094 | mddev_t *my_mddev = rdev->mddev; |
2095 | ||
d7027458 NB |
2096 | if (strict_strtoull(buf, 10, &size) < 0) |
2097 | return -EINVAL; | |
0cd17fec | 2098 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 NB |
2099 | if (my_mddev->persistent) { |
2100 | size = super_types[my_mddev->major_version]. | |
15f4a5fd | 2101 | rdev_size_change(rdev, size * 2); |
0cd17fec CW |
2102 | if (!size) |
2103 | return -EBUSY; | |
2104 | } else if (!size) { | |
2105 | size = (rdev->bdev->bd_inode->i_size >> 10); | |
2106 | size -= rdev->data_offset/2; | |
2107 | } | |
0cd17fec | 2108 | } |
7d3c6f87 CW |
2109 | if (size < my_mddev->size) |
2110 | return -EINVAL; /* component must fit device */ | |
0cd17fec | 2111 | |
83303b61 | 2112 | rdev->size = size; |
d7027458 | 2113 | if (size > oldsize && my_mddev->external) { |
c5d79adb N |
2114 | /* need to check that all other rdevs with the same ->bdev |
2115 | * do not overlap. We need to unlock the mddev to avoid | |
2116 | * a deadlock. We have already changed rdev->size, and if | |
2117 | * we have to change it back, we will have the lock again. | |
2118 | */ | |
2119 | mddev_t *mddev; | |
2120 | int overlap = 0; | |
2121 | struct list_head *tmp, *tmp2; | |
2122 | ||
27c529bb | 2123 | mddev_unlock(my_mddev); |
29ac4aa3 | 2124 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2125 | mdk_rdev_t *rdev2; |
2126 | ||
2127 | mddev_lock(mddev); | |
d089c6af | 2128 | rdev_for_each(rdev2, tmp2, mddev) |
c5d79adb N |
2129 | if (test_bit(AllReserved, &rdev2->flags) || |
2130 | (rdev->bdev == rdev2->bdev && | |
2131 | rdev != rdev2 && | |
d07bd3bc AN |
2132 | overlaps(rdev->data_offset, rdev->size * 2, |
2133 | rdev2->data_offset, | |
2134 | rdev2->size * 2))) { | |
c5d79adb N |
2135 | overlap = 1; |
2136 | break; | |
2137 | } | |
2138 | mddev_unlock(mddev); | |
2139 | if (overlap) { | |
2140 | mddev_put(mddev); | |
2141 | break; | |
2142 | } | |
2143 | } | |
27c529bb | 2144 | mddev_lock(my_mddev); |
c5d79adb N |
2145 | if (overlap) { |
2146 | /* Someone else could have slipped in a size | |
2147 | * change here, but doing so is just silly. | |
2148 | * We put oldsize back because we *know* it is | |
2149 | * safe, and trust userspace not to race with | |
2150 | * itself | |
2151 | */ | |
2152 | rdev->size = oldsize; | |
2153 | return -EBUSY; | |
2154 | } | |
2155 | } | |
83303b61 N |
2156 | return len; |
2157 | } | |
2158 | ||
2159 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2160 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2161 | |
86e6ffdd N |
2162 | static struct attribute *rdev_default_attrs[] = { |
2163 | &rdev_state.attr, | |
4dbcdc75 | 2164 | &rdev_errors.attr, |
014236d2 | 2165 | &rdev_slot.attr, |
93c8cad0 | 2166 | &rdev_offset.attr, |
83303b61 | 2167 | &rdev_size.attr, |
86e6ffdd N |
2168 | NULL, |
2169 | }; | |
2170 | static ssize_t | |
2171 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2172 | { | |
2173 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2174 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2175 | mddev_t *mddev = rdev->mddev; |
2176 | ssize_t rv; | |
86e6ffdd N |
2177 | |
2178 | if (!entry->show) | |
2179 | return -EIO; | |
27c529bb N |
2180 | |
2181 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2182 | if (!rv) { | |
2183 | if (rdev->mddev == NULL) | |
2184 | rv = -EBUSY; | |
2185 | else | |
2186 | rv = entry->show(rdev, page); | |
2187 | mddev_unlock(mddev); | |
2188 | } | |
2189 | return rv; | |
86e6ffdd N |
2190 | } |
2191 | ||
2192 | static ssize_t | |
2193 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2194 | const char *page, size_t length) | |
2195 | { | |
2196 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2197 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2198 | ssize_t rv; |
2199 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2200 | |
2201 | if (!entry->store) | |
2202 | return -EIO; | |
67463acb N |
2203 | if (!capable(CAP_SYS_ADMIN)) |
2204 | return -EACCES; | |
27c529bb | 2205 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2206 | if (!rv) { |
27c529bb N |
2207 | if (rdev->mddev == NULL) |
2208 | rv = -EBUSY; | |
2209 | else | |
2210 | rv = entry->store(rdev, page, length); | |
6a51830e | 2211 | mddev_unlock(mddev); |
ca388059 N |
2212 | } |
2213 | return rv; | |
86e6ffdd N |
2214 | } |
2215 | ||
2216 | static void rdev_free(struct kobject *ko) | |
2217 | { | |
2218 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2219 | kfree(rdev); | |
2220 | } | |
2221 | static struct sysfs_ops rdev_sysfs_ops = { | |
2222 | .show = rdev_attr_show, | |
2223 | .store = rdev_attr_store, | |
2224 | }; | |
2225 | static struct kobj_type rdev_ktype = { | |
2226 | .release = rdev_free, | |
2227 | .sysfs_ops = &rdev_sysfs_ops, | |
2228 | .default_attrs = rdev_default_attrs, | |
2229 | }; | |
2230 | ||
1da177e4 LT |
2231 | /* |
2232 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2233 | * | |
2234 | * mark the device faulty if: | |
2235 | * | |
2236 | * - the device is nonexistent (zero size) | |
2237 | * - the device has no valid superblock | |
2238 | * | |
2239 | * a faulty rdev _never_ has rdev->sb set. | |
2240 | */ | |
2241 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2242 | { | |
2243 | char b[BDEVNAME_SIZE]; | |
2244 | int err; | |
2245 | mdk_rdev_t *rdev; | |
2246 | sector_t size; | |
2247 | ||
9ffae0cf | 2248 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2249 | if (!rdev) { |
2250 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2251 | return ERR_PTR(-ENOMEM); | |
2252 | } | |
1da177e4 LT |
2253 | |
2254 | if ((err = alloc_disk_sb(rdev))) | |
2255 | goto abort_free; | |
2256 | ||
c5d79adb | 2257 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2258 | if (err) |
2259 | goto abort_free; | |
2260 | ||
f9cb074b | 2261 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2262 | |
1da177e4 | 2263 | rdev->desc_nr = -1; |
2b6e8459 | 2264 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2265 | rdev->raid_disk = -1; |
b2d444d7 | 2266 | rdev->flags = 0; |
1da177e4 | 2267 | rdev->data_offset = 0; |
42543769 | 2268 | rdev->sb_events = 0; |
1da177e4 | 2269 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2270 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2271 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2272 | |
2273 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2274 | if (!size) { | |
2275 | printk(KERN_WARNING | |
2276 | "md: %s has zero or unknown size, marking faulty!\n", | |
2277 | bdevname(rdev->bdev,b)); | |
2278 | err = -EINVAL; | |
2279 | goto abort_free; | |
2280 | } | |
2281 | ||
2282 | if (super_format >= 0) { | |
2283 | err = super_types[super_format]. | |
2284 | load_super(rdev, NULL, super_minor); | |
2285 | if (err == -EINVAL) { | |
df968c4e N |
2286 | printk(KERN_WARNING |
2287 | "md: %s does not have a valid v%d.%d " | |
2288 | "superblock, not importing!\n", | |
2289 | bdevname(rdev->bdev,b), | |
2290 | super_format, super_minor); | |
1da177e4 LT |
2291 | goto abort_free; |
2292 | } | |
2293 | if (err < 0) { | |
2294 | printk(KERN_WARNING | |
2295 | "md: could not read %s's sb, not importing!\n", | |
2296 | bdevname(rdev->bdev,b)); | |
2297 | goto abort_free; | |
2298 | } | |
2299 | } | |
6bfe0b49 | 2300 | |
1da177e4 | 2301 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2302 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2303 | |
2304 | return rdev; | |
2305 | ||
2306 | abort_free: | |
2307 | if (rdev->sb_page) { | |
2308 | if (rdev->bdev) | |
2309 | unlock_rdev(rdev); | |
2310 | free_disk_sb(rdev); | |
2311 | } | |
2312 | kfree(rdev); | |
2313 | return ERR_PTR(err); | |
2314 | } | |
2315 | ||
2316 | /* | |
2317 | * Check a full RAID array for plausibility | |
2318 | */ | |
2319 | ||
2320 | ||
a757e64c | 2321 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2322 | { |
2323 | int i; | |
2324 | struct list_head *tmp; | |
2325 | mdk_rdev_t *rdev, *freshest; | |
2326 | char b[BDEVNAME_SIZE]; | |
2327 | ||
2328 | freshest = NULL; | |
d089c6af | 2329 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2330 | switch (super_types[mddev->major_version]. |
2331 | load_super(rdev, freshest, mddev->minor_version)) { | |
2332 | case 1: | |
2333 | freshest = rdev; | |
2334 | break; | |
2335 | case 0: | |
2336 | break; | |
2337 | default: | |
2338 | printk( KERN_ERR \ | |
2339 | "md: fatal superblock inconsistency in %s" | |
2340 | " -- removing from array\n", | |
2341 | bdevname(rdev->bdev,b)); | |
2342 | kick_rdev_from_array(rdev); | |
2343 | } | |
2344 | ||
2345 | ||
2346 | super_types[mddev->major_version]. | |
2347 | validate_super(mddev, freshest); | |
2348 | ||
2349 | i = 0; | |
d089c6af | 2350 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2351 | if (rdev != freshest) |
2352 | if (super_types[mddev->major_version]. | |
2353 | validate_super(mddev, rdev)) { | |
2354 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2355 | " from array!\n", | |
2356 | bdevname(rdev->bdev,b)); | |
2357 | kick_rdev_from_array(rdev); | |
2358 | continue; | |
2359 | } | |
2360 | if (mddev->level == LEVEL_MULTIPATH) { | |
2361 | rdev->desc_nr = i++; | |
2362 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2363 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2364 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2365 | rdev->raid_disk = -1; | |
2366 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2367 | } |
2368 | } | |
2369 | ||
2370 | ||
2371 | ||
2372 | if (mddev->recovery_cp != MaxSector && | |
2373 | mddev->level >= 1) | |
2374 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2375 | " -- starting background reconstruction\n", | |
2376 | mdname(mddev)); | |
2377 | ||
1da177e4 LT |
2378 | } |
2379 | ||
19052c0e N |
2380 | static void md_safemode_timeout(unsigned long data); |
2381 | ||
16f17b39 N |
2382 | static ssize_t |
2383 | safe_delay_show(mddev_t *mddev, char *page) | |
2384 | { | |
2385 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2386 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2387 | } | |
2388 | static ssize_t | |
2389 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2390 | { | |
2391 | int scale=1; | |
2392 | int dot=0; | |
2393 | int i; | |
2394 | unsigned long msec; | |
2395 | char buf[30]; | |
2396 | char *e; | |
2397 | /* remove a period, and count digits after it */ | |
2398 | if (len >= sizeof(buf)) | |
2399 | return -EINVAL; | |
2400 | strlcpy(buf, cbuf, len); | |
2401 | buf[len] = 0; | |
2402 | for (i=0; i<len; i++) { | |
2403 | if (dot) { | |
2404 | if (isdigit(buf[i])) { | |
2405 | buf[i-1] = buf[i]; | |
2406 | scale *= 10; | |
2407 | } | |
2408 | buf[i] = 0; | |
2409 | } else if (buf[i] == '.') { | |
2410 | dot=1; | |
2411 | buf[i] = 0; | |
2412 | } | |
2413 | } | |
2414 | msec = simple_strtoul(buf, &e, 10); | |
2415 | if (e == buf || (*e && *e != '\n')) | |
2416 | return -EINVAL; | |
2417 | msec = (msec * 1000) / scale; | |
2418 | if (msec == 0) | |
2419 | mddev->safemode_delay = 0; | |
2420 | else { | |
19052c0e | 2421 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2422 | mddev->safemode_delay = (msec*HZ)/1000; |
2423 | if (mddev->safemode_delay == 0) | |
2424 | mddev->safemode_delay = 1; | |
19052c0e N |
2425 | if (mddev->safemode_delay < old_delay) |
2426 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2427 | } |
2428 | return len; | |
2429 | } | |
2430 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2431 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2432 | |
eae1701f | 2433 | static ssize_t |
96de1e66 | 2434 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2435 | { |
2604b703 | 2436 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2437 | if (p) |
eae1701f | 2438 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2439 | else if (mddev->clevel[0]) |
2440 | return sprintf(page, "%s\n", mddev->clevel); | |
2441 | else if (mddev->level != LEVEL_NONE) | |
2442 | return sprintf(page, "%d\n", mddev->level); | |
2443 | else | |
2444 | return 0; | |
eae1701f N |
2445 | } |
2446 | ||
d9d166c2 N |
2447 | static ssize_t |
2448 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2449 | { | |
20a49ff6 | 2450 | ssize_t rv = len; |
d9d166c2 N |
2451 | if (mddev->pers) |
2452 | return -EBUSY; | |
2453 | if (len == 0) | |
2454 | return 0; | |
2455 | if (len >= sizeof(mddev->clevel)) | |
2456 | return -ENOSPC; | |
2457 | strncpy(mddev->clevel, buf, len); | |
2458 | if (mddev->clevel[len-1] == '\n') | |
2459 | len--; | |
2460 | mddev->clevel[len] = 0; | |
2461 | mddev->level = LEVEL_NONE; | |
2462 | return rv; | |
2463 | } | |
2464 | ||
2465 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2466 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2467 | |
d4dbd025 N |
2468 | |
2469 | static ssize_t | |
2470 | layout_show(mddev_t *mddev, char *page) | |
2471 | { | |
2472 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2473 | if (mddev->reshape_position != MaxSector && |
2474 | mddev->layout != mddev->new_layout) | |
2475 | return sprintf(page, "%d (%d)\n", | |
2476 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2477 | return sprintf(page, "%d\n", mddev->layout); |
2478 | } | |
2479 | ||
2480 | static ssize_t | |
2481 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2482 | { | |
2483 | char *e; | |
2484 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2485 | |
2486 | if (!*buf || (*e && *e != '\n')) | |
2487 | return -EINVAL; | |
2488 | ||
08a02ecd N |
2489 | if (mddev->pers) |
2490 | return -EBUSY; | |
2491 | if (mddev->reshape_position != MaxSector) | |
2492 | mddev->new_layout = n; | |
2493 | else | |
2494 | mddev->layout = n; | |
d4dbd025 N |
2495 | return len; |
2496 | } | |
2497 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2498 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2499 | |
2500 | ||
eae1701f | 2501 | static ssize_t |
96de1e66 | 2502 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2503 | { |
bb636547 N |
2504 | if (mddev->raid_disks == 0) |
2505 | return 0; | |
08a02ecd N |
2506 | if (mddev->reshape_position != MaxSector && |
2507 | mddev->delta_disks != 0) | |
2508 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2509 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2510 | return sprintf(page, "%d\n", mddev->raid_disks); |
2511 | } | |
2512 | ||
da943b99 N |
2513 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2514 | ||
2515 | static ssize_t | |
2516 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2517 | { | |
da943b99 N |
2518 | char *e; |
2519 | int rv = 0; | |
2520 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2521 | ||
2522 | if (!*buf || (*e && *e != '\n')) | |
2523 | return -EINVAL; | |
2524 | ||
2525 | if (mddev->pers) | |
2526 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2527 | else if (mddev->reshape_position != MaxSector) { |
2528 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2529 | mddev->delta_disks = n - olddisks; | |
2530 | mddev->raid_disks = n; | |
2531 | } else | |
da943b99 N |
2532 | mddev->raid_disks = n; |
2533 | return rv ? rv : len; | |
2534 | } | |
2535 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2536 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2537 | |
3b34380a N |
2538 | static ssize_t |
2539 | chunk_size_show(mddev_t *mddev, char *page) | |
2540 | { | |
08a02ecd N |
2541 | if (mddev->reshape_position != MaxSector && |
2542 | mddev->chunk_size != mddev->new_chunk) | |
2543 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2544 | mddev->chunk_size); | |
3b34380a N |
2545 | return sprintf(page, "%d\n", mddev->chunk_size); |
2546 | } | |
2547 | ||
2548 | static ssize_t | |
2549 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2550 | { | |
2551 | /* can only set chunk_size if array is not yet active */ | |
2552 | char *e; | |
2553 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2554 | ||
3b34380a N |
2555 | if (!*buf || (*e && *e != '\n')) |
2556 | return -EINVAL; | |
2557 | ||
08a02ecd N |
2558 | if (mddev->pers) |
2559 | return -EBUSY; | |
2560 | else if (mddev->reshape_position != MaxSector) | |
2561 | mddev->new_chunk = n; | |
2562 | else | |
2563 | mddev->chunk_size = n; | |
3b34380a N |
2564 | return len; |
2565 | } | |
2566 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2567 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2568 | |
a94213b1 N |
2569 | static ssize_t |
2570 | resync_start_show(mddev_t *mddev, char *page) | |
2571 | { | |
2572 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2573 | } | |
2574 | ||
2575 | static ssize_t | |
2576 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2577 | { | |
a94213b1 N |
2578 | char *e; |
2579 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2580 | ||
2581 | if (mddev->pers) | |
2582 | return -EBUSY; | |
2583 | if (!*buf || (*e && *e != '\n')) | |
2584 | return -EINVAL; | |
2585 | ||
2586 | mddev->recovery_cp = n; | |
2587 | return len; | |
2588 | } | |
2589 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2590 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2591 | |
9e653b63 N |
2592 | /* |
2593 | * The array state can be: | |
2594 | * | |
2595 | * clear | |
2596 | * No devices, no size, no level | |
2597 | * Equivalent to STOP_ARRAY ioctl | |
2598 | * inactive | |
2599 | * May have some settings, but array is not active | |
2600 | * all IO results in error | |
2601 | * When written, doesn't tear down array, but just stops it | |
2602 | * suspended (not supported yet) | |
2603 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2604 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2605 | * readonly |
2606 | * no resync can happen. no superblocks get written. | |
2607 | * write requests fail | |
2608 | * read-auto | |
2609 | * like readonly, but behaves like 'clean' on a write request. | |
2610 | * | |
2611 | * clean - no pending writes, but otherwise active. | |
2612 | * When written to inactive array, starts without resync | |
2613 | * If a write request arrives then | |
2614 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2615 | * if not known, block and switch to write-pending | |
2616 | * If written to an active array that has pending writes, then fails. | |
2617 | * active | |
2618 | * fully active: IO and resync can be happening. | |
2619 | * When written to inactive array, starts with resync | |
2620 | * | |
2621 | * write-pending | |
2622 | * clean, but writes are blocked waiting for 'active' to be written. | |
2623 | * | |
2624 | * active-idle | |
2625 | * like active, but no writes have been seen for a while (100msec). | |
2626 | * | |
2627 | */ | |
2628 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2629 | write_pending, active_idle, bad_word}; | |
05381954 | 2630 | static char *array_states[] = { |
9e653b63 N |
2631 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2632 | "write-pending", "active-idle", NULL }; | |
2633 | ||
2634 | static int match_word(const char *word, char **list) | |
2635 | { | |
2636 | int n; | |
2637 | for (n=0; list[n]; n++) | |
2638 | if (cmd_match(word, list[n])) | |
2639 | break; | |
2640 | return n; | |
2641 | } | |
2642 | ||
2643 | static ssize_t | |
2644 | array_state_show(mddev_t *mddev, char *page) | |
2645 | { | |
2646 | enum array_state st = inactive; | |
2647 | ||
2648 | if (mddev->pers) | |
2649 | switch(mddev->ro) { | |
2650 | case 1: | |
2651 | st = readonly; | |
2652 | break; | |
2653 | case 2: | |
2654 | st = read_auto; | |
2655 | break; | |
2656 | case 0: | |
2657 | if (mddev->in_sync) | |
2658 | st = clean; | |
e691063a N |
2659 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2660 | st = write_pending; | |
9e653b63 N |
2661 | else if (mddev->safemode) |
2662 | st = active_idle; | |
2663 | else | |
2664 | st = active; | |
2665 | } | |
2666 | else { | |
2667 | if (list_empty(&mddev->disks) && | |
2668 | mddev->raid_disks == 0 && | |
2669 | mddev->size == 0) | |
2670 | st = clear; | |
2671 | else | |
2672 | st = inactive; | |
2673 | } | |
2674 | return sprintf(page, "%s\n", array_states[st]); | |
2675 | } | |
2676 | ||
df5b20cf | 2677 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
2678 | static int do_md_run(mddev_t * mddev); |
2679 | static int restart_array(mddev_t *mddev); | |
2680 | ||
2681 | static ssize_t | |
2682 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2683 | { | |
2684 | int err = -EINVAL; | |
2685 | enum array_state st = match_word(buf, array_states); | |
2686 | switch(st) { | |
2687 | case bad_word: | |
2688 | break; | |
2689 | case clear: | |
2690 | /* stopping an active array */ | |
f2ea68cf | 2691 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 2692 | return -EBUSY; |
df5b20cf | 2693 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
2694 | break; |
2695 | case inactive: | |
2696 | /* stopping an active array */ | |
2697 | if (mddev->pers) { | |
f2ea68cf | 2698 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 2699 | return -EBUSY; |
df5b20cf | 2700 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
2701 | } else |
2702 | err = 0; /* already inactive */ | |
9e653b63 N |
2703 | break; |
2704 | case suspended: | |
2705 | break; /* not supported yet */ | |
2706 | case readonly: | |
2707 | if (mddev->pers) | |
df5b20cf | 2708 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
2709 | else { |
2710 | mddev->ro = 1; | |
648b629e | 2711 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
2712 | err = do_md_run(mddev); |
2713 | } | |
2714 | break; | |
2715 | case read_auto: | |
9e653b63 | 2716 | if (mddev->pers) { |
80268ee9 | 2717 | if (mddev->ro == 0) |
df5b20cf | 2718 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 2719 | else if (mddev->ro == 1) |
648b629e N |
2720 | err = restart_array(mddev); |
2721 | if (err == 0) { | |
2722 | mddev->ro = 2; | |
2723 | set_disk_ro(mddev->gendisk, 0); | |
2724 | } | |
9e653b63 N |
2725 | } else { |
2726 | mddev->ro = 2; | |
2727 | err = do_md_run(mddev); | |
2728 | } | |
2729 | break; | |
2730 | case clean: | |
2731 | if (mddev->pers) { | |
2732 | restart_array(mddev); | |
2733 | spin_lock_irq(&mddev->write_lock); | |
2734 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2735 | if (mddev->in_sync == 0) { |
2736 | mddev->in_sync = 1; | |
31a59e34 N |
2737 | if (mddev->safemode == 1) |
2738 | mddev->safemode = 0; | |
e691063a N |
2739 | if (mddev->persistent) |
2740 | set_bit(MD_CHANGE_CLEAN, | |
2741 | &mddev->flags); | |
2742 | } | |
2743 | err = 0; | |
2744 | } else | |
2745 | err = -EBUSY; | |
9e653b63 N |
2746 | spin_unlock_irq(&mddev->write_lock); |
2747 | } else { | |
2748 | mddev->ro = 0; | |
2749 | mddev->recovery_cp = MaxSector; | |
2750 | err = do_md_run(mddev); | |
2751 | } | |
2752 | break; | |
2753 | case active: | |
2754 | if (mddev->pers) { | |
2755 | restart_array(mddev); | |
e691063a N |
2756 | if (mddev->external) |
2757 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2758 | wake_up(&mddev->sb_wait); |
2759 | err = 0; | |
2760 | } else { | |
2761 | mddev->ro = 0; | |
648b629e | 2762 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
2763 | err = do_md_run(mddev); |
2764 | } | |
2765 | break; | |
2766 | case write_pending: | |
2767 | case active_idle: | |
2768 | /* these cannot be set */ | |
2769 | break; | |
2770 | } | |
2771 | if (err) | |
2772 | return err; | |
0fd62b86 NB |
2773 | else { |
2774 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
9e653b63 | 2775 | return len; |
0fd62b86 | 2776 | } |
9e653b63 | 2777 | } |
80ca3a44 N |
2778 | static struct md_sysfs_entry md_array_state = |
2779 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2780 | |
6d7ff738 N |
2781 | static ssize_t |
2782 | null_show(mddev_t *mddev, char *page) | |
2783 | { | |
2784 | return -EINVAL; | |
2785 | } | |
2786 | ||
2787 | static ssize_t | |
2788 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2789 | { | |
2790 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2791 | /* The new device is added to the array. | |
2792 | * If the array has a persistent superblock, we read the | |
2793 | * superblock to initialise info and check validity. | |
2794 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2795 | * which mainly checks size. | |
2796 | */ | |
2797 | char *e; | |
2798 | int major = simple_strtoul(buf, &e, 10); | |
2799 | int minor; | |
2800 | dev_t dev; | |
2801 | mdk_rdev_t *rdev; | |
2802 | int err; | |
2803 | ||
2804 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2805 | return -EINVAL; | |
2806 | minor = simple_strtoul(e+1, &e, 10); | |
2807 | if (*e && *e != '\n') | |
2808 | return -EINVAL; | |
2809 | dev = MKDEV(major, minor); | |
2810 | if (major != MAJOR(dev) || | |
2811 | minor != MINOR(dev)) | |
2812 | return -EOVERFLOW; | |
2813 | ||
2814 | ||
2815 | if (mddev->persistent) { | |
2816 | rdev = md_import_device(dev, mddev->major_version, | |
2817 | mddev->minor_version); | |
2818 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2819 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2820 | mdk_rdev_t, same_set); | |
2821 | err = super_types[mddev->major_version] | |
2822 | .load_super(rdev, rdev0, mddev->minor_version); | |
2823 | if (err < 0) | |
2824 | goto out; | |
2825 | } | |
c5d79adb N |
2826 | } else if (mddev->external) |
2827 | rdev = md_import_device(dev, -2, -1); | |
2828 | else | |
6d7ff738 N |
2829 | rdev = md_import_device(dev, -1, -1); |
2830 | ||
2831 | if (IS_ERR(rdev)) | |
2832 | return PTR_ERR(rdev); | |
2833 | err = bind_rdev_to_array(rdev, mddev); | |
2834 | out: | |
2835 | if (err) | |
2836 | export_rdev(rdev); | |
2837 | return err ? err : len; | |
2838 | } | |
2839 | ||
2840 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2841 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2842 | |
9b1d1dac PC |
2843 | static ssize_t |
2844 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2845 | { | |
2846 | char *end; | |
2847 | unsigned long chunk, end_chunk; | |
2848 | ||
2849 | if (!mddev->bitmap) | |
2850 | goto out; | |
2851 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2852 | while (*buf) { | |
2853 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2854 | if (buf == end) break; | |
2855 | if (*end == '-') { /* range */ | |
2856 | buf = end + 1; | |
2857 | end_chunk = simple_strtoul(buf, &end, 0); | |
2858 | if (buf == end) break; | |
2859 | } | |
2860 | if (*end && !isspace(*end)) break; | |
2861 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2862 | buf = end; | |
2863 | while (isspace(*buf)) buf++; | |
2864 | } | |
2865 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2866 | out: | |
2867 | return len; | |
2868 | } | |
2869 | ||
2870 | static struct md_sysfs_entry md_bitmap = | |
2871 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2872 | ||
a35b0d69 N |
2873 | static ssize_t |
2874 | size_show(mddev_t *mddev, char *page) | |
2875 | { | |
2876 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2877 | } | |
2878 | ||
d71f9f88 | 2879 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
2880 | |
2881 | static ssize_t | |
2882 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2883 | { | |
2884 | /* If array is inactive, we can reduce the component size, but | |
2885 | * not increase it (except from 0). | |
2886 | * If array is active, we can try an on-line resize | |
2887 | */ | |
2888 | char *e; | |
2889 | int err = 0; | |
2890 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2891 | if (!*buf || *buf == '\n' || | |
2892 | (*e && *e != '\n')) | |
2893 | return -EINVAL; | |
2894 | ||
2895 | if (mddev->pers) { | |
d71f9f88 | 2896 | err = update_size(mddev, size * 2); |
850b2b42 | 2897 | md_update_sb(mddev, 1); |
a35b0d69 N |
2898 | } else { |
2899 | if (mddev->size == 0 || | |
2900 | mddev->size > size) | |
2901 | mddev->size = size; | |
2902 | else | |
2903 | err = -ENOSPC; | |
2904 | } | |
2905 | return err ? err : len; | |
2906 | } | |
2907 | ||
2908 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 2909 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 2910 | |
8bb93aac N |
2911 | |
2912 | /* Metdata version. | |
e691063a N |
2913 | * This is one of |
2914 | * 'none' for arrays with no metadata (good luck...) | |
2915 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
2916 | * or N.M for internally known formats |
2917 | */ | |
2918 | static ssize_t | |
2919 | metadata_show(mddev_t *mddev, char *page) | |
2920 | { | |
2921 | if (mddev->persistent) | |
2922 | return sprintf(page, "%d.%d\n", | |
2923 | mddev->major_version, mddev->minor_version); | |
e691063a N |
2924 | else if (mddev->external) |
2925 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
2926 | else |
2927 | return sprintf(page, "none\n"); | |
2928 | } | |
2929 | ||
2930 | static ssize_t | |
2931 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2932 | { | |
2933 | int major, minor; | |
2934 | char *e; | |
ea43ddd8 N |
2935 | /* Changing the details of 'external' metadata is |
2936 | * always permitted. Otherwise there must be | |
2937 | * no devices attached to the array. | |
2938 | */ | |
2939 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
2940 | ; | |
2941 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
2942 | return -EBUSY; |
2943 | ||
2944 | if (cmd_match(buf, "none")) { | |
2945 | mddev->persistent = 0; | |
e691063a N |
2946 | mddev->external = 0; |
2947 | mddev->major_version = 0; | |
2948 | mddev->minor_version = 90; | |
2949 | return len; | |
2950 | } | |
2951 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 2952 | size_t namelen = len-9; |
e691063a N |
2953 | if (namelen >= sizeof(mddev->metadata_type)) |
2954 | namelen = sizeof(mddev->metadata_type)-1; | |
2955 | strncpy(mddev->metadata_type, buf+9, namelen); | |
2956 | mddev->metadata_type[namelen] = 0; | |
2957 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
2958 | mddev->metadata_type[--namelen] = 0; | |
2959 | mddev->persistent = 0; | |
2960 | mddev->external = 1; | |
8bb93aac N |
2961 | mddev->major_version = 0; |
2962 | mddev->minor_version = 90; | |
2963 | return len; | |
2964 | } | |
2965 | major = simple_strtoul(buf, &e, 10); | |
2966 | if (e==buf || *e != '.') | |
2967 | return -EINVAL; | |
2968 | buf = e+1; | |
2969 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 2970 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 2971 | return -EINVAL; |
50511da3 | 2972 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
2973 | return -ENOENT; |
2974 | mddev->major_version = major; | |
2975 | mddev->minor_version = minor; | |
2976 | mddev->persistent = 1; | |
e691063a | 2977 | mddev->external = 0; |
8bb93aac N |
2978 | return len; |
2979 | } | |
2980 | ||
2981 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 2982 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 2983 | |
24dd469d | 2984 | static ssize_t |
7eec314d | 2985 | action_show(mddev_t *mddev, char *page) |
24dd469d | 2986 | { |
7eec314d | 2987 | char *type = "idle"; |
31399d9e | 2988 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 2989 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
2990 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
2991 | type = "reshape"; | |
2992 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2993 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2994 | type = "resync"; | |
2995 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2996 | type = "check"; | |
2997 | else | |
2998 | type = "repair"; | |
72a23c21 | 2999 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3000 | type = "recover"; |
3001 | } | |
3002 | return sprintf(page, "%s\n", type); | |
3003 | } | |
3004 | ||
3005 | static ssize_t | |
7eec314d | 3006 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3007 | { |
7eec314d N |
3008 | if (!mddev->pers || !mddev->pers->sync_request) |
3009 | return -EINVAL; | |
3010 | ||
bce74dac | 3011 | if (cmd_match(page, "idle")) { |
7eec314d N |
3012 | if (mddev->sync_thread) { |
3013 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3014 | md_unregister_thread(mddev->sync_thread); | |
3015 | mddev->sync_thread = NULL; | |
3016 | mddev->recovery = 0; | |
3017 | } | |
03c902e1 N |
3018 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3019 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3020 | return -EBUSY; |
72a23c21 NB |
3021 | else if (cmd_match(page, "resync")) |
3022 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3023 | else if (cmd_match(page, "recover")) { | |
3024 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3025 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3026 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3027 | int err; |
3028 | if (mddev->pers->start_reshape == NULL) | |
3029 | return -EINVAL; | |
3030 | err = mddev->pers->start_reshape(mddev); | |
3031 | if (err) | |
3032 | return err; | |
a99ac971 | 3033 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3034 | } else { |
bce74dac | 3035 | if (cmd_match(page, "check")) |
7eec314d | 3036 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3037 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3038 | return -EINVAL; |
3039 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3040 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3041 | } |
03c902e1 | 3042 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3043 | md_wakeup_thread(mddev->thread); |
72a23c21 | 3044 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
24dd469d N |
3045 | return len; |
3046 | } | |
3047 | ||
9d88883e | 3048 | static ssize_t |
96de1e66 | 3049 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3050 | { |
3051 | return sprintf(page, "%llu\n", | |
3052 | (unsigned long long) mddev->resync_mismatches); | |
3053 | } | |
3054 | ||
80ca3a44 N |
3055 | static struct md_sysfs_entry md_scan_mode = |
3056 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3057 | |
96de1e66 | 3058 | |
80ca3a44 | 3059 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3060 | |
88202a0c N |
3061 | static ssize_t |
3062 | sync_min_show(mddev_t *mddev, char *page) | |
3063 | { | |
3064 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3065 | mddev->sync_speed_min ? "local": "system"); | |
3066 | } | |
3067 | ||
3068 | static ssize_t | |
3069 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3070 | { | |
3071 | int min; | |
3072 | char *e; | |
3073 | if (strncmp(buf, "system", 6)==0) { | |
3074 | mddev->sync_speed_min = 0; | |
3075 | return len; | |
3076 | } | |
3077 | min = simple_strtoul(buf, &e, 10); | |
3078 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3079 | return -EINVAL; | |
3080 | mddev->sync_speed_min = min; | |
3081 | return len; | |
3082 | } | |
3083 | ||
3084 | static struct md_sysfs_entry md_sync_min = | |
3085 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3086 | ||
3087 | static ssize_t | |
3088 | sync_max_show(mddev_t *mddev, char *page) | |
3089 | { | |
3090 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3091 | mddev->sync_speed_max ? "local": "system"); | |
3092 | } | |
3093 | ||
3094 | static ssize_t | |
3095 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3096 | { | |
3097 | int max; | |
3098 | char *e; | |
3099 | if (strncmp(buf, "system", 6)==0) { | |
3100 | mddev->sync_speed_max = 0; | |
3101 | return len; | |
3102 | } | |
3103 | max = simple_strtoul(buf, &e, 10); | |
3104 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3105 | return -EINVAL; | |
3106 | mddev->sync_speed_max = max; | |
3107 | return len; | |
3108 | } | |
3109 | ||
3110 | static struct md_sysfs_entry md_sync_max = | |
3111 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3112 | ||
d7f3d291 IP |
3113 | static ssize_t |
3114 | degraded_show(mddev_t *mddev, char *page) | |
3115 | { | |
3116 | return sprintf(page, "%d\n", mddev->degraded); | |
3117 | } | |
3118 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3119 | |
90b08710 BS |
3120 | static ssize_t |
3121 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3122 | { | |
3123 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3124 | } | |
3125 | ||
3126 | static ssize_t | |
3127 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3128 | { | |
3129 | long n; | |
3130 | ||
3131 | if (strict_strtol(buf, 10, &n)) | |
3132 | return -EINVAL; | |
3133 | ||
3134 | if (n != 0 && n != 1) | |
3135 | return -EINVAL; | |
3136 | ||
3137 | mddev->parallel_resync = n; | |
3138 | ||
3139 | if (mddev->sync_thread) | |
3140 | wake_up(&resync_wait); | |
3141 | ||
3142 | return len; | |
3143 | } | |
3144 | ||
3145 | /* force parallel resync, even with shared block devices */ | |
3146 | static struct md_sysfs_entry md_sync_force_parallel = | |
3147 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3148 | sync_force_parallel_show, sync_force_parallel_store); | |
3149 | ||
88202a0c N |
3150 | static ssize_t |
3151 | sync_speed_show(mddev_t *mddev, char *page) | |
3152 | { | |
3153 | unsigned long resync, dt, db; | |
9687a60c AN |
3154 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3155 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3156 | if (!dt) dt++; |
9687a60c AN |
3157 | db = resync - mddev->resync_mark_cnt; |
3158 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3159 | } |
3160 | ||
80ca3a44 | 3161 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3162 | |
3163 | static ssize_t | |
3164 | sync_completed_show(mddev_t *mddev, char *page) | |
3165 | { | |
3166 | unsigned long max_blocks, resync; | |
3167 | ||
3168 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3169 | max_blocks = mddev->resync_max_sectors; | |
3170 | else | |
3171 | max_blocks = mddev->size << 1; | |
3172 | ||
3173 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
3174 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
3175 | } | |
3176 | ||
80ca3a44 | 3177 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3178 | |
5e96ee65 NB |
3179 | static ssize_t |
3180 | min_sync_show(mddev_t *mddev, char *page) | |
3181 | { | |
3182 | return sprintf(page, "%llu\n", | |
3183 | (unsigned long long)mddev->resync_min); | |
3184 | } | |
3185 | static ssize_t | |
3186 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3187 | { | |
3188 | unsigned long long min; | |
3189 | if (strict_strtoull(buf, 10, &min)) | |
3190 | return -EINVAL; | |
3191 | if (min > mddev->resync_max) | |
3192 | return -EINVAL; | |
3193 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3194 | return -EBUSY; | |
3195 | ||
3196 | /* Must be a multiple of chunk_size */ | |
3197 | if (mddev->chunk_size) { | |
3198 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3199 | return -EINVAL; | |
3200 | } | |
3201 | mddev->resync_min = min; | |
3202 | ||
3203 | return len; | |
3204 | } | |
3205 | ||
3206 | static struct md_sysfs_entry md_min_sync = | |
3207 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3208 | ||
c6207277 N |
3209 | static ssize_t |
3210 | max_sync_show(mddev_t *mddev, char *page) | |
3211 | { | |
3212 | if (mddev->resync_max == MaxSector) | |
3213 | return sprintf(page, "max\n"); | |
3214 | else | |
3215 | return sprintf(page, "%llu\n", | |
3216 | (unsigned long long)mddev->resync_max); | |
3217 | } | |
3218 | static ssize_t | |
3219 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3220 | { | |
3221 | if (strncmp(buf, "max", 3) == 0) | |
3222 | mddev->resync_max = MaxSector; | |
3223 | else { | |
5e96ee65 NB |
3224 | unsigned long long max; |
3225 | if (strict_strtoull(buf, 10, &max)) | |
3226 | return -EINVAL; | |
3227 | if (max < mddev->resync_min) | |
c6207277 N |
3228 | return -EINVAL; |
3229 | if (max < mddev->resync_max && | |
3230 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3231 | return -EBUSY; | |
3232 | ||
3233 | /* Must be a multiple of chunk_size */ | |
3234 | if (mddev->chunk_size) { | |
3235 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3236 | return -EINVAL; | |
3237 | } | |
3238 | mddev->resync_max = max; | |
3239 | } | |
3240 | wake_up(&mddev->recovery_wait); | |
3241 | return len; | |
3242 | } | |
3243 | ||
3244 | static struct md_sysfs_entry md_max_sync = | |
3245 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3246 | ||
e464eafd N |
3247 | static ssize_t |
3248 | suspend_lo_show(mddev_t *mddev, char *page) | |
3249 | { | |
3250 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3251 | } | |
3252 | ||
3253 | static ssize_t | |
3254 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3255 | { | |
3256 | char *e; | |
3257 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3258 | ||
3259 | if (mddev->pers->quiesce == NULL) | |
3260 | return -EINVAL; | |
3261 | if (buf == e || (*e && *e != '\n')) | |
3262 | return -EINVAL; | |
3263 | if (new >= mddev->suspend_hi || | |
3264 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3265 | mddev->suspend_lo = new; | |
3266 | mddev->pers->quiesce(mddev, 2); | |
3267 | return len; | |
3268 | } else | |
3269 | return -EINVAL; | |
3270 | } | |
3271 | static struct md_sysfs_entry md_suspend_lo = | |
3272 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3273 | ||
3274 | ||
3275 | static ssize_t | |
3276 | suspend_hi_show(mddev_t *mddev, char *page) | |
3277 | { | |
3278 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3279 | } | |
3280 | ||
3281 | static ssize_t | |
3282 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3283 | { | |
3284 | char *e; | |
3285 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3286 | ||
3287 | if (mddev->pers->quiesce == NULL) | |
3288 | return -EINVAL; | |
3289 | if (buf == e || (*e && *e != '\n')) | |
3290 | return -EINVAL; | |
3291 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3292 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3293 | mddev->suspend_hi = new; | |
3294 | mddev->pers->quiesce(mddev, 1); | |
3295 | mddev->pers->quiesce(mddev, 0); | |
3296 | return len; | |
3297 | } else | |
3298 | return -EINVAL; | |
3299 | } | |
3300 | static struct md_sysfs_entry md_suspend_hi = | |
3301 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3302 | ||
08a02ecd N |
3303 | static ssize_t |
3304 | reshape_position_show(mddev_t *mddev, char *page) | |
3305 | { | |
3306 | if (mddev->reshape_position != MaxSector) | |
3307 | return sprintf(page, "%llu\n", | |
3308 | (unsigned long long)mddev->reshape_position); | |
3309 | strcpy(page, "none\n"); | |
3310 | return 5; | |
3311 | } | |
3312 | ||
3313 | static ssize_t | |
3314 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3315 | { | |
3316 | char *e; | |
3317 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3318 | if (mddev->pers) | |
3319 | return -EBUSY; | |
3320 | if (buf == e || (*e && *e != '\n')) | |
3321 | return -EINVAL; | |
3322 | mddev->reshape_position = new; | |
3323 | mddev->delta_disks = 0; | |
3324 | mddev->new_level = mddev->level; | |
3325 | mddev->new_layout = mddev->layout; | |
3326 | mddev->new_chunk = mddev->chunk_size; | |
3327 | return len; | |
3328 | } | |
3329 | ||
3330 | static struct md_sysfs_entry md_reshape_position = | |
3331 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3332 | reshape_position_store); | |
3333 | ||
e464eafd | 3334 | |
eae1701f N |
3335 | static struct attribute *md_default_attrs[] = { |
3336 | &md_level.attr, | |
d4dbd025 | 3337 | &md_layout.attr, |
eae1701f | 3338 | &md_raid_disks.attr, |
3b34380a | 3339 | &md_chunk_size.attr, |
a35b0d69 | 3340 | &md_size.attr, |
a94213b1 | 3341 | &md_resync_start.attr, |
8bb93aac | 3342 | &md_metadata.attr, |
6d7ff738 | 3343 | &md_new_device.attr, |
16f17b39 | 3344 | &md_safe_delay.attr, |
9e653b63 | 3345 | &md_array_state.attr, |
08a02ecd | 3346 | &md_reshape_position.attr, |
411036fa N |
3347 | NULL, |
3348 | }; | |
3349 | ||
3350 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3351 | &md_scan_mode.attr, |
9d88883e | 3352 | &md_mismatches.attr, |
88202a0c N |
3353 | &md_sync_min.attr, |
3354 | &md_sync_max.attr, | |
3355 | &md_sync_speed.attr, | |
90b08710 | 3356 | &md_sync_force_parallel.attr, |
88202a0c | 3357 | &md_sync_completed.attr, |
5e96ee65 | 3358 | &md_min_sync.attr, |
c6207277 | 3359 | &md_max_sync.attr, |
e464eafd N |
3360 | &md_suspend_lo.attr, |
3361 | &md_suspend_hi.attr, | |
9b1d1dac | 3362 | &md_bitmap.attr, |
d7f3d291 | 3363 | &md_degraded.attr, |
eae1701f N |
3364 | NULL, |
3365 | }; | |
411036fa N |
3366 | static struct attribute_group md_redundancy_group = { |
3367 | .name = NULL, | |
3368 | .attrs = md_redundancy_attrs, | |
3369 | }; | |
3370 | ||
eae1701f N |
3371 | |
3372 | static ssize_t | |
3373 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3374 | { | |
3375 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3376 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3377 | ssize_t rv; |
eae1701f N |
3378 | |
3379 | if (!entry->show) | |
3380 | return -EIO; | |
5dc5cf7d IM |
3381 | rv = mddev_lock(mddev); |
3382 | if (!rv) { | |
3383 | rv = entry->show(mddev, page); | |
3384 | mddev_unlock(mddev); | |
3385 | } | |
96de1e66 | 3386 | return rv; |
eae1701f N |
3387 | } |
3388 | ||
3389 | static ssize_t | |
3390 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3391 | const char *page, size_t length) | |
3392 | { | |
3393 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3394 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3395 | ssize_t rv; |
eae1701f N |
3396 | |
3397 | if (!entry->store) | |
3398 | return -EIO; | |
67463acb N |
3399 | if (!capable(CAP_SYS_ADMIN)) |
3400 | return -EACCES; | |
5dc5cf7d IM |
3401 | rv = mddev_lock(mddev); |
3402 | if (!rv) { | |
3403 | rv = entry->store(mddev, page, length); | |
3404 | mddev_unlock(mddev); | |
3405 | } | |
96de1e66 | 3406 | return rv; |
eae1701f N |
3407 | } |
3408 | ||
3409 | static void md_free(struct kobject *ko) | |
3410 | { | |
3411 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
3412 | kfree(mddev); | |
3413 | } | |
3414 | ||
3415 | static struct sysfs_ops md_sysfs_ops = { | |
3416 | .show = md_attr_show, | |
3417 | .store = md_attr_store, | |
3418 | }; | |
3419 | static struct kobj_type md_ktype = { | |
3420 | .release = md_free, | |
3421 | .sysfs_ops = &md_sysfs_ops, | |
3422 | .default_attrs = md_default_attrs, | |
3423 | }; | |
3424 | ||
1da177e4 LT |
3425 | int mdp_major = 0; |
3426 | ||
3427 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3428 | { | |
48c9c27b | 3429 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3430 | mddev_t *mddev = mddev_find(dev); |
3431 | struct gendisk *disk; | |
3432 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
3433 | int shift = partitioned ? MdpMinorShift : 0; | |
3434 | int unit = MINOR(dev) >> shift; | |
3830c62f | 3435 | int error; |
1da177e4 LT |
3436 | |
3437 | if (!mddev) | |
3438 | return NULL; | |
3439 | ||
48c9c27b | 3440 | mutex_lock(&disks_mutex); |
1da177e4 | 3441 | if (mddev->gendisk) { |
48c9c27b | 3442 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3443 | mddev_put(mddev); |
3444 | return NULL; | |
3445 | } | |
3446 | disk = alloc_disk(1 << shift); | |
3447 | if (!disk) { | |
48c9c27b | 3448 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3449 | mddev_put(mddev); |
3450 | return NULL; | |
3451 | } | |
3452 | disk->major = MAJOR(dev); | |
3453 | disk->first_minor = unit << shift; | |
ce7b0f46 | 3454 | if (partitioned) |
1da177e4 | 3455 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3456 | else |
1da177e4 | 3457 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3458 | disk->fops = &md_fops; |
3459 | disk->private_data = mddev; | |
3460 | disk->queue = mddev->queue; | |
3461 | add_disk(disk); | |
3462 | mddev->gendisk = disk; | |
ed9e1982 TH |
3463 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
3464 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
f48ed538 | 3465 | mutex_unlock(&disks_mutex); |
3830c62f | 3466 | if (error) |
5e55e2f5 N |
3467 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3468 | disk->disk_name); | |
3830c62f GKH |
3469 | else |
3470 | kobject_uevent(&mddev->kobj, KOBJ_ADD); | |
1da177e4 LT |
3471 | return NULL; |
3472 | } | |
3473 | ||
1da177e4 LT |
3474 | static void md_safemode_timeout(unsigned long data) |
3475 | { | |
3476 | mddev_t *mddev = (mddev_t *) data; | |
3477 | ||
0fd62b86 NB |
3478 | if (!atomic_read(&mddev->writes_pending)) { |
3479 | mddev->safemode = 1; | |
3480 | if (mddev->external) | |
d8e64406 | 3481 | set_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags); |
0fd62b86 | 3482 | } |
1da177e4 LT |
3483 | md_wakeup_thread(mddev->thread); |
3484 | } | |
3485 | ||
6ff8d8ec | 3486 | static int start_dirty_degraded; |
1da177e4 LT |
3487 | |
3488 | static int do_md_run(mddev_t * mddev) | |
3489 | { | |
2604b703 | 3490 | int err; |
1da177e4 LT |
3491 | int chunk_size; |
3492 | struct list_head *tmp; | |
3493 | mdk_rdev_t *rdev; | |
3494 | struct gendisk *disk; | |
2604b703 | 3495 | struct mdk_personality *pers; |
1da177e4 LT |
3496 | char b[BDEVNAME_SIZE]; |
3497 | ||
a757e64c N |
3498 | if (list_empty(&mddev->disks)) |
3499 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3500 | return -EINVAL; |
1da177e4 LT |
3501 | |
3502 | if (mddev->pers) | |
3503 | return -EBUSY; | |
3504 | ||
3505 | /* | |
3506 | * Analyze all RAID superblock(s) | |
3507 | */ | |
1ec4a939 N |
3508 | if (!mddev->raid_disks) { |
3509 | if (!mddev->persistent) | |
3510 | return -EINVAL; | |
a757e64c | 3511 | analyze_sbs(mddev); |
1ec4a939 | 3512 | } |
1da177e4 LT |
3513 | |
3514 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3515 | |
3516 | if (chunk_size) { | |
1da177e4 LT |
3517 | if (chunk_size > MAX_CHUNK_SIZE) { |
3518 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3519 | chunk_size, MAX_CHUNK_SIZE); | |
3520 | return -EINVAL; | |
3521 | } | |
3522 | /* | |
4bbf3771 | 3523 | * chunk-size has to be a power of 2 |
1da177e4 LT |
3524 | */ |
3525 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3526 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3527 | return -EINVAL; |
3528 | } | |
1da177e4 LT |
3529 | |
3530 | /* devices must have minimum size of one chunk */ | |
d089c6af | 3531 | rdev_for_each(rdev, tmp, mddev) { |
b2d444d7 | 3532 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3533 | continue; |
3534 | if (rdev->size < chunk_size / 1024) { | |
3535 | printk(KERN_WARNING | |
3536 | "md: Dev %s smaller than chunk_size:" | |
3537 | " %lluk < %dk\n", | |
3538 | bdevname(rdev->bdev,b), | |
3539 | (unsigned long long)rdev->size, | |
3540 | chunk_size / 1024); | |
3541 | return -EINVAL; | |
3542 | } | |
3543 | } | |
3544 | } | |
3545 | ||
d9d166c2 N |
3546 | if (mddev->level != LEVEL_NONE) |
3547 | request_module("md-level-%d", mddev->level); | |
3548 | else if (mddev->clevel[0]) | |
3549 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3550 | |
3551 | /* | |
3552 | * Drop all container device buffers, from now on | |
3553 | * the only valid external interface is through the md | |
3554 | * device. | |
1da177e4 | 3555 | */ |
d089c6af | 3556 | rdev_for_each(rdev, tmp, mddev) { |
b2d444d7 | 3557 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3558 | continue; |
3559 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3560 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3561 | |
3562 | /* perform some consistency tests on the device. | |
3563 | * We don't want the data to overlap the metadata, | |
3564 | * Internal Bitmap issues has handled elsewhere. | |
3565 | */ | |
0f420358 | 3566 | if (rdev->data_offset < rdev->sb_start) { |
f0d76d70 N |
3567 | if (mddev->size && |
3568 | rdev->data_offset + mddev->size*2 | |
0f420358 | 3569 | > rdev->sb_start) { |
f0d76d70 N |
3570 | printk("md: %s: data overlaps metadata\n", |
3571 | mdname(mddev)); | |
3572 | return -EINVAL; | |
3573 | } | |
3574 | } else { | |
0f420358 | 3575 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
3576 | > rdev->data_offset) { |
3577 | printk("md: %s: metadata overlaps data\n", | |
3578 | mdname(mddev)); | |
3579 | return -EINVAL; | |
3580 | } | |
3581 | } | |
52664732 | 3582 | sysfs_notify(&rdev->kobj, NULL, "state"); |
1da177e4 LT |
3583 | } |
3584 | ||
3585 | md_probe(mddev->unit, NULL, NULL); | |
3586 | disk = mddev->gendisk; | |
3587 | if (!disk) | |
3588 | return -ENOMEM; | |
3589 | ||
3590 | spin_lock(&pers_lock); | |
d9d166c2 | 3591 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3592 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3593 | spin_unlock(&pers_lock); |
d9d166c2 N |
3594 | if (mddev->level != LEVEL_NONE) |
3595 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3596 | mddev->level); | |
3597 | else | |
3598 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3599 | mddev->clevel); | |
1da177e4 LT |
3600 | return -EINVAL; |
3601 | } | |
2604b703 | 3602 | mddev->pers = pers; |
1da177e4 | 3603 | spin_unlock(&pers_lock); |
d9d166c2 N |
3604 | mddev->level = pers->level; |
3605 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3606 | |
f6705578 | 3607 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3608 | pers->start_reshape == NULL) { |
f6705578 N |
3609 | /* This personality cannot handle reshaping... */ |
3610 | mddev->pers = NULL; | |
3611 | module_put(pers->owner); | |
3612 | return -EINVAL; | |
3613 | } | |
3614 | ||
7dd5e7c3 N |
3615 | if (pers->sync_request) { |
3616 | /* Warn if this is a potentially silly | |
3617 | * configuration. | |
3618 | */ | |
3619 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3620 | mdk_rdev_t *rdev2; | |
3621 | struct list_head *tmp2; | |
3622 | int warned = 0; | |
d089c6af N |
3623 | rdev_for_each(rdev, tmp, mddev) { |
3624 | rdev_for_each(rdev2, tmp2, mddev) { | |
7dd5e7c3 N |
3625 | if (rdev < rdev2 && |
3626 | rdev->bdev->bd_contains == | |
3627 | rdev2->bdev->bd_contains) { | |
3628 | printk(KERN_WARNING | |
3629 | "%s: WARNING: %s appears to be" | |
3630 | " on the same physical disk as" | |
3631 | " %s.\n", | |
3632 | mdname(mddev), | |
3633 | bdevname(rdev->bdev,b), | |
3634 | bdevname(rdev2->bdev,b2)); | |
3635 | warned = 1; | |
3636 | } | |
3637 | } | |
3638 | } | |
3639 | if (warned) | |
3640 | printk(KERN_WARNING | |
3641 | "True protection against single-disk" | |
3642 | " failure might be compromised.\n"); | |
3643 | } | |
3644 | ||
657390d2 | 3645 | mddev->recovery = 0; |
1da177e4 | 3646 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3647 | mddev->barriers_work = 1; |
6ff8d8ec | 3648 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3649 | |
f91de92e N |
3650 | if (start_readonly) |
3651 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3652 | ||
b15c2e57 | 3653 | err = mddev->pers->run(mddev); |
13e53df3 AN |
3654 | if (err) |
3655 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3656 | else if (mddev->pers->sync_request) { | |
b15c2e57 N |
3657 | err = bitmap_create(mddev); |
3658 | if (err) { | |
3659 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3660 | mdname(mddev), err); | |
3661 | mddev->pers->stop(mddev); | |
3662 | } | |
3663 | } | |
1da177e4 | 3664 | if (err) { |
1da177e4 LT |
3665 | module_put(mddev->pers->owner); |
3666 | mddev->pers = NULL; | |
32a7627c N |
3667 | bitmap_destroy(mddev); |
3668 | return err; | |
1da177e4 | 3669 | } |
5e55e2f5 N |
3670 | if (mddev->pers->sync_request) { |
3671 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3672 | printk(KERN_WARNING | |
3673 | "md: cannot register extra attributes for %s\n", | |
3674 | mdname(mddev)); | |
3675 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ | |
fd9d49ca N |
3676 | mddev->ro = 0; |
3677 | ||
1da177e4 LT |
3678 | atomic_set(&mddev->writes_pending,0); |
3679 | mddev->safemode = 0; | |
3680 | mddev->safemode_timer.function = md_safemode_timeout; | |
3681 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3682 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3683 | mddev->in_sync = 1; |
86e6ffdd | 3684 | |
d089c6af | 3685 | rdev_for_each(rdev, tmp, mddev) |
86e6ffdd N |
3686 | if (rdev->raid_disk >= 0) { |
3687 | char nm[20]; | |
3688 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3689 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3690 | printk("md: cannot register %s for %s\n", | |
3691 | nm, mdname(mddev)); | |
86e6ffdd | 3692 | } |
1da177e4 LT |
3693 | |
3694 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3695 | ||
850b2b42 N |
3696 | if (mddev->flags) |
3697 | md_update_sb(mddev, 0); | |
1da177e4 | 3698 | |
f233ea5c | 3699 | set_capacity(disk, mddev->array_sectors); |
1da177e4 LT |
3700 | |
3701 | /* If we call blk_queue_make_request here, it will | |
3702 | * re-initialise max_sectors etc which may have been | |
3703 | * refined inside -> run. So just set the bits we need to set. | |
3704 | * Most initialisation happended when we called | |
3705 | * blk_queue_make_request(..., md_fail_request) | |
3706 | * earlier. | |
3707 | */ | |
3708 | mddev->queue->queuedata = mddev; | |
3709 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3710 | ||
5fd6c1dc N |
3711 | /* If there is a partially-recovered drive we need to |
3712 | * start recovery here. If we leave it to md_check_recovery, | |
3713 | * it will remove the drives and not do the right thing | |
3714 | */ | |
0b8c9de0 | 3715 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc N |
3716 | struct list_head *rtmp; |
3717 | int spares = 0; | |
d089c6af | 3718 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
3719 | if (rdev->raid_disk >= 0 && |
3720 | !test_bit(In_sync, &rdev->flags) && | |
3721 | !test_bit(Faulty, &rdev->flags)) | |
3722 | /* complete an interrupted recovery */ | |
3723 | spares++; | |
3724 | if (spares && mddev->pers->sync_request) { | |
3725 | mddev->recovery = 0; | |
3726 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3727 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3728 | mddev, | |
3729 | "%s_resync"); | |
3730 | if (!mddev->sync_thread) { | |
3731 | printk(KERN_ERR "%s: could not start resync" | |
3732 | " thread...\n", | |
3733 | mdname(mddev)); | |
3734 | /* leave the spares where they are, it shouldn't hurt */ | |
3735 | mddev->recovery = 0; | |
0b8c9de0 | 3736 | } |
5fd6c1dc N |
3737 | } |
3738 | } | |
0b8c9de0 N |
3739 | md_wakeup_thread(mddev->thread); |
3740 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3741 | |
44ce6294 | 3742 | mddev->changed = 1; |
d7603b7e | 3743 | md_new_event(mddev); |
0fd62b86 | 3744 | sysfs_notify(&mddev->kobj, NULL, "array_state"); |
72a23c21 | 3745 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
a99ac971 | 3746 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 3747 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
3748 | return 0; |
3749 | } | |
3750 | ||
3751 | static int restart_array(mddev_t *mddev) | |
3752 | { | |
3753 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 3754 | |
80fab1d7 | 3755 | /* Complain if it has no devices */ |
1da177e4 | 3756 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
3757 | return -ENXIO; |
3758 | if (!mddev->pers) | |
3759 | return -EINVAL; | |
3760 | if (!mddev->ro) | |
3761 | return -EBUSY; | |
3762 | mddev->safemode = 0; | |
3763 | mddev->ro = 0; | |
3764 | set_disk_ro(disk, 0); | |
3765 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3766 | mdname(mddev)); | |
3767 | /* Kick recovery or resync if necessary */ | |
3768 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3769 | md_wakeup_thread(mddev->thread); | |
3770 | md_wakeup_thread(mddev->sync_thread); | |
3771 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
3772 | return 0; | |
1da177e4 LT |
3773 | } |
3774 | ||
acc55e22 N |
3775 | /* similar to deny_write_access, but accounts for our holding a reference |
3776 | * to the file ourselves */ | |
3777 | static int deny_bitmap_write_access(struct file * file) | |
3778 | { | |
3779 | struct inode *inode = file->f_mapping->host; | |
3780 | ||
3781 | spin_lock(&inode->i_lock); | |
3782 | if (atomic_read(&inode->i_writecount) > 1) { | |
3783 | spin_unlock(&inode->i_lock); | |
3784 | return -ETXTBSY; | |
3785 | } | |
3786 | atomic_set(&inode->i_writecount, -1); | |
3787 | spin_unlock(&inode->i_lock); | |
3788 | ||
3789 | return 0; | |
3790 | } | |
3791 | ||
3792 | static void restore_bitmap_write_access(struct file *file) | |
3793 | { | |
3794 | struct inode *inode = file->f_mapping->host; | |
3795 | ||
3796 | spin_lock(&inode->i_lock); | |
3797 | atomic_set(&inode->i_writecount, 1); | |
3798 | spin_unlock(&inode->i_lock); | |
3799 | } | |
3800 | ||
9e653b63 N |
3801 | /* mode: |
3802 | * 0 - completely stop and dis-assemble array | |
3803 | * 1 - switch to readonly | |
3804 | * 2 - stop but do not disassemble array | |
3805 | */ | |
df5b20cf | 3806 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
3807 | { |
3808 | int err = 0; | |
3809 | struct gendisk *disk = mddev->gendisk; | |
3810 | ||
f2ea68cf | 3811 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf NB |
3812 | printk("md: %s still in use.\n",mdname(mddev)); |
3813 | return -EBUSY; | |
3814 | } | |
3815 | ||
1da177e4 | 3816 | if (mddev->pers) { |
1da177e4 LT |
3817 | |
3818 | if (mddev->sync_thread) { | |
5fd6c1dc | 3819 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3820 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3821 | md_unregister_thread(mddev->sync_thread); | |
3822 | mddev->sync_thread = NULL; | |
3823 | } | |
3824 | ||
3825 | del_timer_sync(&mddev->safemode_timer); | |
3826 | ||
9e653b63 N |
3827 | switch(mode) { |
3828 | case 1: /* readonly */ | |
1da177e4 | 3829 | err = -ENXIO; |
f91de92e | 3830 | if (mddev->ro==1) |
1da177e4 LT |
3831 | goto out; |
3832 | mddev->ro = 1; | |
9e653b63 N |
3833 | break; |
3834 | case 0: /* disassemble */ | |
3835 | case 2: /* stop */ | |
6b8b3e8a | 3836 | bitmap_flush(mddev); |
a9701a30 | 3837 | md_super_wait(mddev); |
1da177e4 LT |
3838 | if (mddev->ro) |
3839 | set_disk_ro(disk, 0); | |
3840 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3841 | mddev->pers->stop(mddev); | |
d1b5380c N |
3842 | mddev->queue->merge_bvec_fn = NULL; |
3843 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 3844 | mddev->queue->backing_dev_info.congested_fn = NULL; |
411036fa N |
3845 | if (mddev->pers->sync_request) |
3846 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
3847 | ||
1da177e4 LT |
3848 | module_put(mddev->pers->owner); |
3849 | mddev->pers = NULL; | |
4f54b0e9 DW |
3850 | /* tell userspace to handle 'inactive' */ |
3851 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
0d4ca600 N |
3852 | |
3853 | set_capacity(disk, 0); | |
44ce6294 | 3854 | mddev->changed = 1; |
0d4ca600 | 3855 | |
1da177e4 LT |
3856 | if (mddev->ro) |
3857 | mddev->ro = 0; | |
3858 | } | |
850b2b42 | 3859 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
3860 | /* mark array as shutdown cleanly */ |
3861 | mddev->in_sync = 1; | |
850b2b42 | 3862 | md_update_sb(mddev, 1); |
1da177e4 | 3863 | } |
9e653b63 | 3864 | if (mode == 1) |
1da177e4 | 3865 | set_disk_ro(disk, 1); |
5fd6c1dc | 3866 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3867 | } |
32a7627c | 3868 | |
1da177e4 LT |
3869 | /* |
3870 | * Free resources if final stop | |
3871 | */ | |
9e653b63 | 3872 | if (mode == 0) { |
86e6ffdd N |
3873 | mdk_rdev_t *rdev; |
3874 | struct list_head *tmp; | |
0d4ca600 | 3875 | |
1da177e4 LT |
3876 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
3877 | ||
978f946b N |
3878 | bitmap_destroy(mddev); |
3879 | if (mddev->bitmap_file) { | |
acc55e22 | 3880 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3881 | fput(mddev->bitmap_file); |
3882 | mddev->bitmap_file = NULL; | |
3883 | } | |
3884 | mddev->bitmap_offset = 0; | |
3885 | ||
d089c6af | 3886 | rdev_for_each(rdev, tmp, mddev) |
86e6ffdd N |
3887 | if (rdev->raid_disk >= 0) { |
3888 | char nm[20]; | |
3889 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3890 | sysfs_remove_link(&mddev->kobj, nm); | |
3891 | } | |
3892 | ||
177a99b2 | 3893 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
3894 | flush_scheduled_work(); |
3895 | ||
1da177e4 LT |
3896 | export_array(mddev); |
3897 | ||
f233ea5c | 3898 | mddev->array_sectors = 0; |
9e653b63 N |
3899 | mddev->size = 0; |
3900 | mddev->raid_disks = 0; | |
a94213b1 | 3901 | mddev->recovery_cp = 0; |
5e96ee65 | 3902 | mddev->resync_min = 0; |
c6207277 | 3903 | mddev->resync_max = MaxSector; |
08a02ecd | 3904 | mddev->reshape_position = MaxSector; |
e691063a | 3905 | mddev->external = 0; |
1ec4a939 | 3906 | mddev->persistent = 0; |
d897dbf9 N |
3907 | mddev->level = LEVEL_NONE; |
3908 | mddev->clevel[0] = 0; | |
3909 | mddev->flags = 0; | |
3910 | mddev->ro = 0; | |
3911 | mddev->metadata_type[0] = 0; | |
3912 | mddev->chunk_size = 0; | |
3913 | mddev->ctime = mddev->utime = 0; | |
3914 | mddev->layout = 0; | |
3915 | mddev->max_disks = 0; | |
3916 | mddev->events = 0; | |
3917 | mddev->delta_disks = 0; | |
3918 | mddev->new_level = LEVEL_NONE; | |
3919 | mddev->new_layout = 0; | |
3920 | mddev->new_chunk = 0; | |
3921 | mddev->curr_resync = 0; | |
3922 | mddev->resync_mismatches = 0; | |
3923 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
3924 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
3925 | mddev->recovery = 0; | |
3926 | mddev->in_sync = 0; | |
3927 | mddev->changed = 0; | |
3928 | mddev->degraded = 0; | |
3929 | mddev->barriers_work = 0; | |
3930 | mddev->safemode = 0; | |
9e653b63 | 3931 | |
a8a55c38 | 3932 | } else if (mddev->pers) |
1da177e4 LT |
3933 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
3934 | mdname(mddev)); | |
3935 | err = 0; | |
d7603b7e | 3936 | md_new_event(mddev); |
0fd62b86 | 3937 | sysfs_notify(&mddev->kobj, NULL, "array_state"); |
1da177e4 LT |
3938 | out: |
3939 | return err; | |
3940 | } | |
3941 | ||
fdee8ae4 | 3942 | #ifndef MODULE |
1da177e4 LT |
3943 | static void autorun_array(mddev_t *mddev) |
3944 | { | |
3945 | mdk_rdev_t *rdev; | |
3946 | struct list_head *tmp; | |
3947 | int err; | |
3948 | ||
a757e64c | 3949 | if (list_empty(&mddev->disks)) |
1da177e4 | 3950 | return; |
1da177e4 LT |
3951 | |
3952 | printk(KERN_INFO "md: running: "); | |
3953 | ||
d089c6af | 3954 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
3955 | char b[BDEVNAME_SIZE]; |
3956 | printk("<%s>", bdevname(rdev->bdev,b)); | |
3957 | } | |
3958 | printk("\n"); | |
3959 | ||
d710e138 | 3960 | err = do_md_run(mddev); |
1da177e4 LT |
3961 | if (err) { |
3962 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 3963 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
3964 | } |
3965 | } | |
3966 | ||
3967 | /* | |
3968 | * lets try to run arrays based on all disks that have arrived | |
3969 | * until now. (those are in pending_raid_disks) | |
3970 | * | |
3971 | * the method: pick the first pending disk, collect all disks with | |
3972 | * the same UUID, remove all from the pending list and put them into | |
3973 | * the 'same_array' list. Then order this list based on superblock | |
3974 | * update time (freshest comes first), kick out 'old' disks and | |
3975 | * compare superblocks. If everything's fine then run it. | |
3976 | * | |
3977 | * If "unit" is allocated, then bump its reference count | |
3978 | */ | |
3979 | static void autorun_devices(int part) | |
3980 | { | |
1da177e4 LT |
3981 | struct list_head *tmp; |
3982 | mdk_rdev_t *rdev0, *rdev; | |
3983 | mddev_t *mddev; | |
3984 | char b[BDEVNAME_SIZE]; | |
3985 | ||
3986 | printk(KERN_INFO "md: autorun ...\n"); | |
3987 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 3988 | int unit; |
1da177e4 | 3989 | dev_t dev; |
ad01c9e3 | 3990 | LIST_HEAD(candidates); |
1da177e4 LT |
3991 | rdev0 = list_entry(pending_raid_disks.next, |
3992 | mdk_rdev_t, same_set); | |
3993 | ||
3994 | printk(KERN_INFO "md: considering %s ...\n", | |
3995 | bdevname(rdev0->bdev,b)); | |
3996 | INIT_LIST_HEAD(&candidates); | |
73c34431 | 3997 | rdev_for_each_list(rdev, tmp, pending_raid_disks) |
1da177e4 LT |
3998 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
3999 | printk(KERN_INFO "md: adding %s ...\n", | |
4000 | bdevname(rdev->bdev,b)); | |
4001 | list_move(&rdev->same_set, &candidates); | |
4002 | } | |
4003 | /* | |
4004 | * now we have a set of devices, with all of them having | |
4005 | * mostly sane superblocks. It's time to allocate the | |
4006 | * mddev. | |
4007 | */ | |
e8703fe1 N |
4008 | if (part) { |
4009 | dev = MKDEV(mdp_major, | |
4010 | rdev0->preferred_minor << MdpMinorShift); | |
4011 | unit = MINOR(dev) >> MdpMinorShift; | |
4012 | } else { | |
4013 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4014 | unit = MINOR(dev); | |
4015 | } | |
4016 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4017 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4018 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4019 | break; | |
4020 | } | |
1da177e4 LT |
4021 | |
4022 | md_probe(dev, NULL, NULL); | |
4023 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4024 | if (!mddev || !mddev->gendisk) { |
4025 | if (mddev) | |
4026 | mddev_put(mddev); | |
4027 | printk(KERN_ERR | |
1da177e4 LT |
4028 | "md: cannot allocate memory for md drive.\n"); |
4029 | break; | |
4030 | } | |
4031 | if (mddev_lock(mddev)) | |
4032 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4033 | mdname(mddev)); | |
4034 | else if (mddev->raid_disks || mddev->major_version | |
4035 | || !list_empty(&mddev->disks)) { | |
4036 | printk(KERN_WARNING | |
4037 | "md: %s already running, cannot run %s\n", | |
4038 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4039 | mddev_unlock(mddev); | |
4040 | } else { | |
4041 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4042 | mddev->persistent = 1; |
73c34431 | 4043 | rdev_for_each_list(rdev, tmp, candidates) { |
1da177e4 LT |
4044 | list_del_init(&rdev->same_set); |
4045 | if (bind_rdev_to_array(rdev, mddev)) | |
4046 | export_rdev(rdev); | |
4047 | } | |
4048 | autorun_array(mddev); | |
4049 | mddev_unlock(mddev); | |
4050 | } | |
4051 | /* on success, candidates will be empty, on error | |
4052 | * it won't... | |
4053 | */ | |
4b80991c N |
4054 | rdev_for_each_list(rdev, tmp, candidates) { |
4055 | list_del_init(&rdev->same_set); | |
1da177e4 | 4056 | export_rdev(rdev); |
4b80991c | 4057 | } |
1da177e4 LT |
4058 | mddev_put(mddev); |
4059 | } | |
4060 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4061 | } | |
fdee8ae4 | 4062 | #endif /* !MODULE */ |
1da177e4 | 4063 | |
1da177e4 LT |
4064 | static int get_version(void __user * arg) |
4065 | { | |
4066 | mdu_version_t ver; | |
4067 | ||
4068 | ver.major = MD_MAJOR_VERSION; | |
4069 | ver.minor = MD_MINOR_VERSION; | |
4070 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4071 | ||
4072 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4073 | return -EFAULT; | |
4074 | ||
4075 | return 0; | |
4076 | } | |
4077 | ||
4078 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4079 | { | |
4080 | mdu_array_info_t info; | |
4081 | int nr,working,active,failed,spare; | |
4082 | mdk_rdev_t *rdev; | |
4083 | struct list_head *tmp; | |
4084 | ||
4085 | nr=working=active=failed=spare=0; | |
d089c6af | 4086 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 | 4087 | nr++; |
b2d444d7 | 4088 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4089 | failed++; |
4090 | else { | |
4091 | working++; | |
b2d444d7 | 4092 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4093 | active++; |
4094 | else | |
4095 | spare++; | |
4096 | } | |
4097 | } | |
4098 | ||
4099 | info.major_version = mddev->major_version; | |
4100 | info.minor_version = mddev->minor_version; | |
4101 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4102 | info.ctime = mddev->ctime; | |
4103 | info.level = mddev->level; | |
4104 | info.size = mddev->size; | |
284ae7ca N |
4105 | if (info.size != mddev->size) /* overflow */ |
4106 | info.size = -1; | |
1da177e4 LT |
4107 | info.nr_disks = nr; |
4108 | info.raid_disks = mddev->raid_disks; | |
4109 | info.md_minor = mddev->md_minor; | |
4110 | info.not_persistent= !mddev->persistent; | |
4111 | ||
4112 | info.utime = mddev->utime; | |
4113 | info.state = 0; | |
4114 | if (mddev->in_sync) | |
4115 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4116 | if (mddev->bitmap && mddev->bitmap_offset) |
4117 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4118 | info.active_disks = active; |
4119 | info.working_disks = working; | |
4120 | info.failed_disks = failed; | |
4121 | info.spare_disks = spare; | |
4122 | ||
4123 | info.layout = mddev->layout; | |
4124 | info.chunk_size = mddev->chunk_size; | |
4125 | ||
4126 | if (copy_to_user(arg, &info, sizeof(info))) | |
4127 | return -EFAULT; | |
4128 | ||
4129 | return 0; | |
4130 | } | |
4131 | ||
87162a28 | 4132 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4133 | { |
4134 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4135 | char *ptr, *buf = NULL; | |
4136 | int err = -ENOMEM; | |
4137 | ||
b5470dc5 DW |
4138 | if (md_allow_write(mddev)) |
4139 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4140 | else | |
4141 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4142 | |
32a7627c N |
4143 | if (!file) |
4144 | goto out; | |
4145 | ||
4146 | /* bitmap disabled, zero the first byte and copy out */ | |
4147 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4148 | file->pathname[0] = '\0'; | |
4149 | goto copy_out; | |
4150 | } | |
4151 | ||
4152 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4153 | if (!buf) | |
4154 | goto out; | |
4155 | ||
6bcfd601 CH |
4156 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4157 | if (IS_ERR(ptr)) | |
32a7627c N |
4158 | goto out; |
4159 | ||
4160 | strcpy(file->pathname, ptr); | |
4161 | ||
4162 | copy_out: | |
4163 | err = 0; | |
4164 | if (copy_to_user(arg, file, sizeof(*file))) | |
4165 | err = -EFAULT; | |
4166 | out: | |
4167 | kfree(buf); | |
4168 | kfree(file); | |
4169 | return err; | |
4170 | } | |
4171 | ||
1da177e4 LT |
4172 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4173 | { | |
4174 | mdu_disk_info_t info; | |
1da177e4 LT |
4175 | mdk_rdev_t *rdev; |
4176 | ||
4177 | if (copy_from_user(&info, arg, sizeof(info))) | |
4178 | return -EFAULT; | |
4179 | ||
26ef379f | 4180 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4181 | if (rdev) { |
4182 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4183 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4184 | info.raid_disk = rdev->raid_disk; | |
4185 | info.state = 0; | |
b2d444d7 | 4186 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4187 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4188 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4189 | info.state |= (1<<MD_DISK_ACTIVE); |
4190 | info.state |= (1<<MD_DISK_SYNC); | |
4191 | } | |
8ddf9efe N |
4192 | if (test_bit(WriteMostly, &rdev->flags)) |
4193 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4194 | } else { |
4195 | info.major = info.minor = 0; | |
4196 | info.raid_disk = -1; | |
4197 | info.state = (1<<MD_DISK_REMOVED); | |
4198 | } | |
4199 | ||
4200 | if (copy_to_user(arg, &info, sizeof(info))) | |
4201 | return -EFAULT; | |
4202 | ||
4203 | return 0; | |
4204 | } | |
4205 | ||
4206 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4207 | { | |
4208 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4209 | mdk_rdev_t *rdev; | |
4210 | dev_t dev = MKDEV(info->major,info->minor); | |
4211 | ||
4212 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4213 | return -EOVERFLOW; | |
4214 | ||
4215 | if (!mddev->raid_disks) { | |
4216 | int err; | |
4217 | /* expecting a device which has a superblock */ | |
4218 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4219 | if (IS_ERR(rdev)) { | |
4220 | printk(KERN_WARNING | |
4221 | "md: md_import_device returned %ld\n", | |
4222 | PTR_ERR(rdev)); | |
4223 | return PTR_ERR(rdev); | |
4224 | } | |
4225 | if (!list_empty(&mddev->disks)) { | |
4226 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4227 | mdk_rdev_t, same_set); | |
4228 | int err = super_types[mddev->major_version] | |
4229 | .load_super(rdev, rdev0, mddev->minor_version); | |
4230 | if (err < 0) { | |
4231 | printk(KERN_WARNING | |
4232 | "md: %s has different UUID to %s\n", | |
4233 | bdevname(rdev->bdev,b), | |
4234 | bdevname(rdev0->bdev,b2)); | |
4235 | export_rdev(rdev); | |
4236 | return -EINVAL; | |
4237 | } | |
4238 | } | |
4239 | err = bind_rdev_to_array(rdev, mddev); | |
4240 | if (err) | |
4241 | export_rdev(rdev); | |
4242 | return err; | |
4243 | } | |
4244 | ||
4245 | /* | |
4246 | * add_new_disk can be used once the array is assembled | |
4247 | * to add "hot spares". They must already have a superblock | |
4248 | * written | |
4249 | */ | |
4250 | if (mddev->pers) { | |
4251 | int err; | |
4252 | if (!mddev->pers->hot_add_disk) { | |
4253 | printk(KERN_WARNING | |
4254 | "%s: personality does not support diskops!\n", | |
4255 | mdname(mddev)); | |
4256 | return -EINVAL; | |
4257 | } | |
7b1e35f6 N |
4258 | if (mddev->persistent) |
4259 | rdev = md_import_device(dev, mddev->major_version, | |
4260 | mddev->minor_version); | |
4261 | else | |
4262 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4263 | if (IS_ERR(rdev)) { |
4264 | printk(KERN_WARNING | |
4265 | "md: md_import_device returned %ld\n", | |
4266 | PTR_ERR(rdev)); | |
4267 | return PTR_ERR(rdev); | |
4268 | } | |
41158c7e N |
4269 | /* set save_raid_disk if appropriate */ |
4270 | if (!mddev->persistent) { | |
4271 | if (info->state & (1<<MD_DISK_SYNC) && | |
4272 | info->raid_disk < mddev->raid_disks) | |
4273 | rdev->raid_disk = info->raid_disk; | |
4274 | else | |
4275 | rdev->raid_disk = -1; | |
4276 | } else | |
4277 | super_types[mddev->major_version]. | |
4278 | validate_super(mddev, rdev); | |
4279 | rdev->saved_raid_disk = rdev->raid_disk; | |
4280 | ||
b2d444d7 | 4281 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4282 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4283 | set_bit(WriteMostly, &rdev->flags); | |
4284 | ||
1da177e4 LT |
4285 | rdev->raid_disk = -1; |
4286 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4287 | if (!err && !mddev->pers->hot_remove_disk) { |
4288 | /* If there is hot_add_disk but no hot_remove_disk | |
4289 | * then added disks for geometry changes, | |
4290 | * and should be added immediately. | |
4291 | */ | |
4292 | super_types[mddev->major_version]. | |
4293 | validate_super(mddev, rdev); | |
4294 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4295 | if (err) | |
4296 | unbind_rdev_from_array(rdev); | |
4297 | } | |
1da177e4 LT |
4298 | if (err) |
4299 | export_rdev(rdev); | |
52664732 NB |
4300 | else |
4301 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
c361777f | 4302 | |
17571284 | 4303 | md_update_sb(mddev, 1); |
72a23c21 NB |
4304 | if (mddev->degraded) |
4305 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4306 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4307 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4308 | return err; |
4309 | } | |
4310 | ||
4311 | /* otherwise, add_new_disk is only allowed | |
4312 | * for major_version==0 superblocks | |
4313 | */ | |
4314 | if (mddev->major_version != 0) { | |
4315 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4316 | mdname(mddev)); | |
4317 | return -EINVAL; | |
4318 | } | |
4319 | ||
4320 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4321 | int err; | |
d710e138 | 4322 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4323 | if (IS_ERR(rdev)) { |
4324 | printk(KERN_WARNING | |
4325 | "md: error, md_import_device() returned %ld\n", | |
4326 | PTR_ERR(rdev)); | |
4327 | return PTR_ERR(rdev); | |
4328 | } | |
4329 | rdev->desc_nr = info->number; | |
4330 | if (info->raid_disk < mddev->raid_disks) | |
4331 | rdev->raid_disk = info->raid_disk; | |
4332 | else | |
4333 | rdev->raid_disk = -1; | |
4334 | ||
1da177e4 | 4335 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4336 | if (info->state & (1<<MD_DISK_SYNC)) |
4337 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4338 | |
8ddf9efe N |
4339 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4340 | set_bit(WriteMostly, &rdev->flags); | |
4341 | ||
1da177e4 LT |
4342 | if (!mddev->persistent) { |
4343 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4344 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4345 | } else |
0f420358 | 4346 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
e7debaa4 | 4347 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4348 | |
2bf071bf N |
4349 | err = bind_rdev_to_array(rdev, mddev); |
4350 | if (err) { | |
4351 | export_rdev(rdev); | |
4352 | return err; | |
4353 | } | |
1da177e4 LT |
4354 | } |
4355 | ||
4356 | return 0; | |
4357 | } | |
4358 | ||
4359 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4360 | { | |
4361 | char b[BDEVNAME_SIZE]; | |
4362 | mdk_rdev_t *rdev; | |
4363 | ||
1da177e4 LT |
4364 | rdev = find_rdev(mddev, dev); |
4365 | if (!rdev) | |
4366 | return -ENXIO; | |
4367 | ||
4368 | if (rdev->raid_disk >= 0) | |
4369 | goto busy; | |
4370 | ||
4371 | kick_rdev_from_array(rdev); | |
850b2b42 | 4372 | md_update_sb(mddev, 1); |
d7603b7e | 4373 | md_new_event(mddev); |
1da177e4 LT |
4374 | |
4375 | return 0; | |
4376 | busy: | |
fdefa4d8 | 4377 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4378 | bdevname(rdev->bdev,b), mdname(mddev)); |
4379 | return -EBUSY; | |
4380 | } | |
4381 | ||
4382 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4383 | { | |
4384 | char b[BDEVNAME_SIZE]; | |
4385 | int err; | |
1da177e4 LT |
4386 | mdk_rdev_t *rdev; |
4387 | ||
4388 | if (!mddev->pers) | |
4389 | return -ENODEV; | |
4390 | ||
4391 | if (mddev->major_version != 0) { | |
4392 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4393 | " version-0 superblocks.\n", | |
4394 | mdname(mddev)); | |
4395 | return -EINVAL; | |
4396 | } | |
4397 | if (!mddev->pers->hot_add_disk) { | |
4398 | printk(KERN_WARNING | |
4399 | "%s: personality does not support diskops!\n", | |
4400 | mdname(mddev)); | |
4401 | return -EINVAL; | |
4402 | } | |
4403 | ||
d710e138 | 4404 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4405 | if (IS_ERR(rdev)) { |
4406 | printk(KERN_WARNING | |
4407 | "md: error, md_import_device() returned %ld\n", | |
4408 | PTR_ERR(rdev)); | |
4409 | return -EINVAL; | |
4410 | } | |
4411 | ||
4412 | if (mddev->persistent) | |
0f420358 | 4413 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4414 | else |
0f420358 | 4415 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4416 | |
e7debaa4 | 4417 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4418 | |
b2d444d7 | 4419 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4420 | printk(KERN_WARNING |
4421 | "md: can not hot-add faulty %s disk to %s!\n", | |
4422 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4423 | err = -EINVAL; | |
4424 | goto abort_export; | |
4425 | } | |
b2d444d7 | 4426 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4427 | rdev->desc_nr = -1; |
5842730d | 4428 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4429 | err = bind_rdev_to_array(rdev, mddev); |
4430 | if (err) | |
4431 | goto abort_export; | |
1da177e4 LT |
4432 | |
4433 | /* | |
4434 | * The rest should better be atomic, we can have disk failures | |
4435 | * noticed in interrupt contexts ... | |
4436 | */ | |
4437 | ||
4438 | if (rdev->desc_nr == mddev->max_disks) { | |
4439 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4440 | mdname(mddev)); | |
4441 | err = -EBUSY; | |
4442 | goto abort_unbind_export; | |
4443 | } | |
4444 | ||
4445 | rdev->raid_disk = -1; | |
4446 | ||
850b2b42 | 4447 | md_update_sb(mddev, 1); |
1da177e4 LT |
4448 | |
4449 | /* | |
4450 | * Kick recovery, maybe this spare has to be added to the | |
4451 | * array immediately. | |
4452 | */ | |
4453 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4454 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4455 | md_new_event(mddev); |
1da177e4 LT |
4456 | return 0; |
4457 | ||
4458 | abort_unbind_export: | |
4459 | unbind_rdev_from_array(rdev); | |
4460 | ||
4461 | abort_export: | |
4462 | export_rdev(rdev); | |
4463 | return err; | |
4464 | } | |
4465 | ||
32a7627c N |
4466 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4467 | { | |
4468 | int err; | |
4469 | ||
36fa3063 N |
4470 | if (mddev->pers) { |
4471 | if (!mddev->pers->quiesce) | |
4472 | return -EBUSY; | |
4473 | if (mddev->recovery || mddev->sync_thread) | |
4474 | return -EBUSY; | |
4475 | /* we should be able to change the bitmap.. */ | |
4476 | } | |
32a7627c | 4477 | |
32a7627c | 4478 | |
36fa3063 N |
4479 | if (fd >= 0) { |
4480 | if (mddev->bitmap) | |
4481 | return -EEXIST; /* cannot add when bitmap is present */ | |
4482 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4483 | |
36fa3063 N |
4484 | if (mddev->bitmap_file == NULL) { |
4485 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4486 | mdname(mddev)); | |
4487 | return -EBADF; | |
4488 | } | |
4489 | ||
4490 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4491 | if (err) { | |
4492 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4493 | mdname(mddev)); | |
4494 | fput(mddev->bitmap_file); | |
4495 | mddev->bitmap_file = NULL; | |
4496 | return err; | |
4497 | } | |
a654b9d8 | 4498 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4499 | } else if (mddev->bitmap == NULL) |
4500 | return -ENOENT; /* cannot remove what isn't there */ | |
4501 | err = 0; | |
4502 | if (mddev->pers) { | |
4503 | mddev->pers->quiesce(mddev, 1); | |
4504 | if (fd >= 0) | |
4505 | err = bitmap_create(mddev); | |
d7375ab3 | 4506 | if (fd < 0 || err) { |
36fa3063 | 4507 | bitmap_destroy(mddev); |
d7375ab3 N |
4508 | fd = -1; /* make sure to put the file */ |
4509 | } | |
36fa3063 | 4510 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4511 | } |
4512 | if (fd < 0) { | |
acc55e22 N |
4513 | if (mddev->bitmap_file) { |
4514 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4515 | fput(mddev->bitmap_file); |
acc55e22 | 4516 | } |
36fa3063 N |
4517 | mddev->bitmap_file = NULL; |
4518 | } | |
4519 | ||
32a7627c N |
4520 | return err; |
4521 | } | |
4522 | ||
1da177e4 LT |
4523 | /* |
4524 | * set_array_info is used two different ways | |
4525 | * The original usage is when creating a new array. | |
4526 | * In this usage, raid_disks is > 0 and it together with | |
4527 | * level, size, not_persistent,layout,chunksize determine the | |
4528 | * shape of the array. | |
4529 | * This will always create an array with a type-0.90.0 superblock. | |
4530 | * The newer usage is when assembling an array. | |
4531 | * In this case raid_disks will be 0, and the major_version field is | |
4532 | * use to determine which style super-blocks are to be found on the devices. | |
4533 | * The minor and patch _version numbers are also kept incase the | |
4534 | * super_block handler wishes to interpret them. | |
4535 | */ | |
4536 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4537 | { | |
4538 | ||
4539 | if (info->raid_disks == 0) { | |
4540 | /* just setting version number for superblock loading */ | |
4541 | if (info->major_version < 0 || | |
50511da3 | 4542 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4543 | super_types[info->major_version].name == NULL) { |
4544 | /* maybe try to auto-load a module? */ | |
4545 | printk(KERN_INFO | |
4546 | "md: superblock version %d not known\n", | |
4547 | info->major_version); | |
4548 | return -EINVAL; | |
4549 | } | |
4550 | mddev->major_version = info->major_version; | |
4551 | mddev->minor_version = info->minor_version; | |
4552 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4553 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4554 | return 0; |
4555 | } | |
4556 | mddev->major_version = MD_MAJOR_VERSION; | |
4557 | mddev->minor_version = MD_MINOR_VERSION; | |
4558 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4559 | mddev->ctime = get_seconds(); | |
4560 | ||
4561 | mddev->level = info->level; | |
17115e03 | 4562 | mddev->clevel[0] = 0; |
1da177e4 LT |
4563 | mddev->size = info->size; |
4564 | mddev->raid_disks = info->raid_disks; | |
4565 | /* don't set md_minor, it is determined by which /dev/md* was | |
4566 | * openned | |
4567 | */ | |
4568 | if (info->state & (1<<MD_SB_CLEAN)) | |
4569 | mddev->recovery_cp = MaxSector; | |
4570 | else | |
4571 | mddev->recovery_cp = 0; | |
4572 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4573 | mddev->external = 0; |
1da177e4 LT |
4574 | |
4575 | mddev->layout = info->layout; | |
4576 | mddev->chunk_size = info->chunk_size; | |
4577 | ||
4578 | mddev->max_disks = MD_SB_DISKS; | |
4579 | ||
e691063a N |
4580 | if (mddev->persistent) |
4581 | mddev->flags = 0; | |
850b2b42 | 4582 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4583 | |
b2a2703c N |
4584 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4585 | mddev->bitmap_offset = 0; | |
4586 | ||
f6705578 N |
4587 | mddev->reshape_position = MaxSector; |
4588 | ||
1da177e4 LT |
4589 | /* |
4590 | * Generate a 128 bit UUID | |
4591 | */ | |
4592 | get_random_bytes(mddev->uuid, 16); | |
4593 | ||
f6705578 N |
4594 | mddev->new_level = mddev->level; |
4595 | mddev->new_chunk = mddev->chunk_size; | |
4596 | mddev->new_layout = mddev->layout; | |
4597 | mddev->delta_disks = 0; | |
4598 | ||
1da177e4 LT |
4599 | return 0; |
4600 | } | |
4601 | ||
d71f9f88 | 4602 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 N |
4603 | { |
4604 | mdk_rdev_t * rdev; | |
4605 | int rv; | |
4606 | struct list_head *tmp; | |
d71f9f88 | 4607 | int fit = (num_sectors == 0); |
a35b0d69 N |
4608 | |
4609 | if (mddev->pers->resize == NULL) | |
4610 | return -EINVAL; | |
d71f9f88 AN |
4611 | /* The "num_sectors" is the number of sectors of each device that |
4612 | * is used. This can only make sense for arrays with redundancy. | |
4613 | * linear and raid0 always use whatever space is available. We can only | |
4614 | * consider changing this number if no resync or reconstruction is | |
4615 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 4616 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
4617 | * of each device. If num_sectors is zero, we find the largest size |
4618 | * that fits. | |
4619 | ||
a35b0d69 N |
4620 | */ |
4621 | if (mddev->sync_thread) | |
4622 | return -EBUSY; | |
dba034ee N |
4623 | if (mddev->bitmap) |
4624 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
4625 | * grow, and re-add. | |
4626 | */ | |
4627 | return -EBUSY; | |
d089c6af | 4628 | rdev_for_each(rdev, tmp, mddev) { |
a35b0d69 | 4629 | sector_t avail; |
01ab5662 N |
4630 | avail = rdev->size * 2; |
4631 | ||
d71f9f88 AN |
4632 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
4633 | num_sectors = avail; | |
4634 | if (avail < num_sectors) | |
a35b0d69 N |
4635 | return -ENOSPC; |
4636 | } | |
d71f9f88 | 4637 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
4638 | if (!rv) { |
4639 | struct block_device *bdev; | |
4640 | ||
4641 | bdev = bdget_disk(mddev->gendisk, 0); | |
4642 | if (bdev) { | |
1b1dcc1b | 4643 | mutex_lock(&bdev->bd_inode->i_mutex); |
f233ea5c AN |
4644 | i_size_write(bdev->bd_inode, |
4645 | (loff_t)mddev->array_sectors << 9); | |
1b1dcc1b | 4646 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4647 | bdput(bdev); |
4648 | } | |
4649 | } | |
4650 | return rv; | |
4651 | } | |
4652 | ||
da943b99 N |
4653 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4654 | { | |
4655 | int rv; | |
4656 | /* change the number of raid disks */ | |
63c70c4f | 4657 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4658 | return -EINVAL; |
4659 | if (raid_disks <= 0 || | |
4660 | raid_disks >= mddev->max_disks) | |
4661 | return -EINVAL; | |
63c70c4f | 4662 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4663 | return -EBUSY; |
63c70c4f N |
4664 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4665 | ||
4666 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4667 | return rv; |
4668 | } | |
4669 | ||
4670 | ||
1da177e4 LT |
4671 | /* |
4672 | * update_array_info is used to change the configuration of an | |
4673 | * on-line array. | |
4674 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4675 | * fields in the info are checked against the array. | |
4676 | * Any differences that cannot be handled will cause an error. | |
4677 | * Normally, only one change can be managed at a time. | |
4678 | */ | |
4679 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4680 | { | |
4681 | int rv = 0; | |
4682 | int cnt = 0; | |
36fa3063 N |
4683 | int state = 0; |
4684 | ||
4685 | /* calculate expected state,ignoring low bits */ | |
4686 | if (mddev->bitmap && mddev->bitmap_offset) | |
4687 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4688 | |
4689 | if (mddev->major_version != info->major_version || | |
4690 | mddev->minor_version != info->minor_version || | |
4691 | /* mddev->patch_version != info->patch_version || */ | |
4692 | mddev->ctime != info->ctime || | |
4693 | mddev->level != info->level || | |
4694 | /* mddev->layout != info->layout || */ | |
4695 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4696 | mddev->chunk_size != info->chunk_size || |
4697 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4698 | ((state^info->state) & 0xfffffe00) | |
4699 | ) | |
1da177e4 LT |
4700 | return -EINVAL; |
4701 | /* Check there is only one change */ | |
284ae7ca | 4702 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4703 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4704 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4705 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4706 | if (cnt == 0) return 0; |
4707 | if (cnt > 1) return -EINVAL; | |
4708 | ||
4709 | if (mddev->layout != info->layout) { | |
4710 | /* Change layout | |
4711 | * we don't need to do anything at the md level, the | |
4712 | * personality will take care of it all. | |
4713 | */ | |
4714 | if (mddev->pers->reconfig == NULL) | |
4715 | return -EINVAL; | |
4716 | else | |
4717 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4718 | } | |
284ae7ca | 4719 | if (info->size >= 0 && mddev->size != info->size) |
d71f9f88 | 4720 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 4721 | |
da943b99 N |
4722 | if (mddev->raid_disks != info->raid_disks) |
4723 | rv = update_raid_disks(mddev, info->raid_disks); | |
4724 | ||
36fa3063 N |
4725 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4726 | if (mddev->pers->quiesce == NULL) | |
4727 | return -EINVAL; | |
4728 | if (mddev->recovery || mddev->sync_thread) | |
4729 | return -EBUSY; | |
4730 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4731 | /* add the bitmap */ | |
4732 | if (mddev->bitmap) | |
4733 | return -EEXIST; | |
4734 | if (mddev->default_bitmap_offset == 0) | |
4735 | return -EINVAL; | |
4736 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4737 | mddev->pers->quiesce(mddev, 1); | |
4738 | rv = bitmap_create(mddev); | |
4739 | if (rv) | |
4740 | bitmap_destroy(mddev); | |
4741 | mddev->pers->quiesce(mddev, 0); | |
4742 | } else { | |
4743 | /* remove the bitmap */ | |
4744 | if (!mddev->bitmap) | |
4745 | return -ENOENT; | |
4746 | if (mddev->bitmap->file) | |
4747 | return -EINVAL; | |
4748 | mddev->pers->quiesce(mddev, 1); | |
4749 | bitmap_destroy(mddev); | |
4750 | mddev->pers->quiesce(mddev, 0); | |
4751 | mddev->bitmap_offset = 0; | |
4752 | } | |
4753 | } | |
850b2b42 | 4754 | md_update_sb(mddev, 1); |
1da177e4 LT |
4755 | return rv; |
4756 | } | |
4757 | ||
4758 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4759 | { | |
4760 | mdk_rdev_t *rdev; | |
4761 | ||
4762 | if (mddev->pers == NULL) | |
4763 | return -ENODEV; | |
4764 | ||
4765 | rdev = find_rdev(mddev, dev); | |
4766 | if (!rdev) | |
4767 | return -ENODEV; | |
4768 | ||
4769 | md_error(mddev, rdev); | |
4770 | return 0; | |
4771 | } | |
4772 | ||
2f9618ce AN |
4773 | /* |
4774 | * We have a problem here : there is no easy way to give a CHS | |
4775 | * virtual geometry. We currently pretend that we have a 2 heads | |
4776 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4777 | * dosfs just mad... ;-) | |
4778 | */ | |
a885c8c4 CH |
4779 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4780 | { | |
4781 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4782 | ||
4783 | geo->heads = 2; | |
4784 | geo->sectors = 4; | |
4785 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4786 | return 0; | |
4787 | } | |
4788 | ||
1da177e4 LT |
4789 | static int md_ioctl(struct inode *inode, struct file *file, |
4790 | unsigned int cmd, unsigned long arg) | |
4791 | { | |
4792 | int err = 0; | |
4793 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4794 | mddev_t *mddev = NULL; |
4795 | ||
4796 | if (!capable(CAP_SYS_ADMIN)) | |
4797 | return -EACCES; | |
4798 | ||
4799 | /* | |
4800 | * Commands dealing with the RAID driver but not any | |
4801 | * particular array: | |
4802 | */ | |
4803 | switch (cmd) | |
4804 | { | |
4805 | case RAID_VERSION: | |
4806 | err = get_version(argp); | |
4807 | goto done; | |
4808 | ||
4809 | case PRINT_RAID_DEBUG: | |
4810 | err = 0; | |
4811 | md_print_devices(); | |
4812 | goto done; | |
4813 | ||
4814 | #ifndef MODULE | |
4815 | case RAID_AUTORUN: | |
4816 | err = 0; | |
4817 | autostart_arrays(arg); | |
4818 | goto done; | |
4819 | #endif | |
4820 | default:; | |
4821 | } | |
4822 | ||
4823 | /* | |
4824 | * Commands creating/starting a new array: | |
4825 | */ | |
4826 | ||
4827 | mddev = inode->i_bdev->bd_disk->private_data; | |
4828 | ||
4829 | if (!mddev) { | |
4830 | BUG(); | |
4831 | goto abort; | |
4832 | } | |
4833 | ||
1da177e4 LT |
4834 | err = mddev_lock(mddev); |
4835 | if (err) { | |
4836 | printk(KERN_INFO | |
4837 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4838 | err, cmd); | |
4839 | goto abort; | |
4840 | } | |
4841 | ||
4842 | switch (cmd) | |
4843 | { | |
4844 | case SET_ARRAY_INFO: | |
4845 | { | |
4846 | mdu_array_info_t info; | |
4847 | if (!arg) | |
4848 | memset(&info, 0, sizeof(info)); | |
4849 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4850 | err = -EFAULT; | |
4851 | goto abort_unlock; | |
4852 | } | |
4853 | if (mddev->pers) { | |
4854 | err = update_array_info(mddev, &info); | |
4855 | if (err) { | |
4856 | printk(KERN_WARNING "md: couldn't update" | |
4857 | " array info. %d\n", err); | |
4858 | goto abort_unlock; | |
4859 | } | |
4860 | goto done_unlock; | |
4861 | } | |
4862 | if (!list_empty(&mddev->disks)) { | |
4863 | printk(KERN_WARNING | |
4864 | "md: array %s already has disks!\n", | |
4865 | mdname(mddev)); | |
4866 | err = -EBUSY; | |
4867 | goto abort_unlock; | |
4868 | } | |
4869 | if (mddev->raid_disks) { | |
4870 | printk(KERN_WARNING | |
4871 | "md: array %s already initialised!\n", | |
4872 | mdname(mddev)); | |
4873 | err = -EBUSY; | |
4874 | goto abort_unlock; | |
4875 | } | |
4876 | err = set_array_info(mddev, &info); | |
4877 | if (err) { | |
4878 | printk(KERN_WARNING "md: couldn't set" | |
4879 | " array info. %d\n", err); | |
4880 | goto abort_unlock; | |
4881 | } | |
4882 | } | |
4883 | goto done_unlock; | |
4884 | ||
4885 | default:; | |
4886 | } | |
4887 | ||
4888 | /* | |
4889 | * Commands querying/configuring an existing array: | |
4890 | */ | |
32a7627c | 4891 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 4892 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
4893 | if ((!mddev->raid_disks && !mddev->external) |
4894 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
4895 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
4896 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
4897 | err = -ENODEV; |
4898 | goto abort_unlock; | |
4899 | } | |
4900 | ||
4901 | /* | |
4902 | * Commands even a read-only array can execute: | |
4903 | */ | |
4904 | switch (cmd) | |
4905 | { | |
4906 | case GET_ARRAY_INFO: | |
4907 | err = get_array_info(mddev, argp); | |
4908 | goto done_unlock; | |
4909 | ||
32a7627c | 4910 | case GET_BITMAP_FILE: |
87162a28 | 4911 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
4912 | goto done_unlock; |
4913 | ||
1da177e4 LT |
4914 | case GET_DISK_INFO: |
4915 | err = get_disk_info(mddev, argp); | |
4916 | goto done_unlock; | |
4917 | ||
4918 | case RESTART_ARRAY_RW: | |
4919 | err = restart_array(mddev); | |
4920 | goto done_unlock; | |
4921 | ||
4922 | case STOP_ARRAY: | |
d710e138 | 4923 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
4924 | goto done_unlock; |
4925 | ||
4926 | case STOP_ARRAY_RO: | |
d710e138 | 4927 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
4928 | goto done_unlock; |
4929 | ||
1da177e4 LT |
4930 | } |
4931 | ||
4932 | /* | |
4933 | * The remaining ioctls are changing the state of the | |
f91de92e N |
4934 | * superblock, so we do not allow them on read-only arrays. |
4935 | * However non-MD ioctls (e.g. get-size) will still come through | |
4936 | * here and hit the 'default' below, so only disallow | |
4937 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 4938 | */ |
bb57fc64 | 4939 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
4940 | if (mddev->ro == 2) { |
4941 | mddev->ro = 0; | |
0fd62b86 NB |
4942 | sysfs_notify(&mddev->kobj, NULL, "array_state"); |
4943 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4944 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
4945 | } else { |
4946 | err = -EROFS; | |
4947 | goto abort_unlock; | |
4948 | } | |
1da177e4 LT |
4949 | } |
4950 | ||
4951 | switch (cmd) | |
4952 | { | |
4953 | case ADD_NEW_DISK: | |
4954 | { | |
4955 | mdu_disk_info_t info; | |
4956 | if (copy_from_user(&info, argp, sizeof(info))) | |
4957 | err = -EFAULT; | |
4958 | else | |
4959 | err = add_new_disk(mddev, &info); | |
4960 | goto done_unlock; | |
4961 | } | |
4962 | ||
4963 | case HOT_REMOVE_DISK: | |
4964 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
4965 | goto done_unlock; | |
4966 | ||
4967 | case HOT_ADD_DISK: | |
4968 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
4969 | goto done_unlock; | |
4970 | ||
4971 | case SET_DISK_FAULTY: | |
4972 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
4973 | goto done_unlock; | |
4974 | ||
4975 | case RUN_ARRAY: | |
d710e138 | 4976 | err = do_md_run(mddev); |
1da177e4 LT |
4977 | goto done_unlock; |
4978 | ||
32a7627c N |
4979 | case SET_BITMAP_FILE: |
4980 | err = set_bitmap_file(mddev, (int)arg); | |
4981 | goto done_unlock; | |
4982 | ||
1da177e4 | 4983 | default: |
1da177e4 LT |
4984 | err = -EINVAL; |
4985 | goto abort_unlock; | |
4986 | } | |
4987 | ||
4988 | done_unlock: | |
4989 | abort_unlock: | |
4990 | mddev_unlock(mddev); | |
4991 | ||
4992 | return err; | |
4993 | done: | |
4994 | if (err) | |
4995 | MD_BUG(); | |
4996 | abort: | |
4997 | return err; | |
4998 | } | |
4999 | ||
5000 | static int md_open(struct inode *inode, struct file *file) | |
5001 | { | |
5002 | /* | |
5003 | * Succeed if we can lock the mddev, which confirms that | |
5004 | * it isn't being stopped right now. | |
5005 | */ | |
5006 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
5007 | int err; | |
5008 | ||
d63a5a74 | 5009 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5010 | goto out; |
5011 | ||
5012 | err = 0; | |
5013 | mddev_get(mddev); | |
f2ea68cf | 5014 | atomic_inc(&mddev->openers); |
1da177e4 LT |
5015 | mddev_unlock(mddev); |
5016 | ||
5017 | check_disk_change(inode->i_bdev); | |
5018 | out: | |
5019 | return err; | |
5020 | } | |
5021 | ||
5022 | static int md_release(struct inode *inode, struct file * file) | |
5023 | { | |
5024 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
5025 | ||
52e5f9d1 | 5026 | BUG_ON(!mddev); |
f2ea68cf | 5027 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5028 | mddev_put(mddev); |
5029 | ||
5030 | return 0; | |
5031 | } | |
5032 | ||
44ce6294 LT |
5033 | static int md_media_changed(struct gendisk *disk) |
5034 | { | |
5035 | mddev_t *mddev = disk->private_data; | |
5036 | ||
5037 | return mddev->changed; | |
5038 | } | |
5039 | ||
5040 | static int md_revalidate(struct gendisk *disk) | |
5041 | { | |
5042 | mddev_t *mddev = disk->private_data; | |
5043 | ||
5044 | mddev->changed = 0; | |
5045 | return 0; | |
5046 | } | |
1da177e4 LT |
5047 | static struct block_device_operations md_fops = |
5048 | { | |
5049 | .owner = THIS_MODULE, | |
5050 | .open = md_open, | |
5051 | .release = md_release, | |
5052 | .ioctl = md_ioctl, | |
a885c8c4 | 5053 | .getgeo = md_getgeo, |
44ce6294 LT |
5054 | .media_changed = md_media_changed, |
5055 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5056 | }; |
5057 | ||
75c96f85 | 5058 | static int md_thread(void * arg) |
1da177e4 LT |
5059 | { |
5060 | mdk_thread_t *thread = arg; | |
5061 | ||
1da177e4 LT |
5062 | /* |
5063 | * md_thread is a 'system-thread', it's priority should be very | |
5064 | * high. We avoid resource deadlocks individually in each | |
5065 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5066 | * the very same RT priority as kswapd, thus we will never get | |
5067 | * into a priority inversion deadlock. | |
5068 | * | |
5069 | * we definitely have to have equal or higher priority than | |
5070 | * bdflush, otherwise bdflush will deadlock if there are too | |
5071 | * many dirty RAID5 blocks. | |
5072 | */ | |
1da177e4 | 5073 | |
6985c43f | 5074 | allow_signal(SIGKILL); |
a6fb0934 | 5075 | while (!kthread_should_stop()) { |
1da177e4 | 5076 | |
93588e22 N |
5077 | /* We need to wait INTERRUPTIBLE so that |
5078 | * we don't add to the load-average. | |
5079 | * That means we need to be sure no signals are | |
5080 | * pending | |
5081 | */ | |
5082 | if (signal_pending(current)) | |
5083 | flush_signals(current); | |
5084 | ||
5085 | wait_event_interruptible_timeout | |
5086 | (thread->wqueue, | |
5087 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5088 | || kthread_should_stop(), | |
5089 | thread->timeout); | |
1da177e4 LT |
5090 | |
5091 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5092 | ||
787453c2 | 5093 | thread->run(thread->mddev); |
1da177e4 | 5094 | } |
a6fb0934 | 5095 | |
1da177e4 LT |
5096 | return 0; |
5097 | } | |
5098 | ||
5099 | void md_wakeup_thread(mdk_thread_t *thread) | |
5100 | { | |
5101 | if (thread) { | |
5102 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5103 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5104 | wake_up(&thread->wqueue); | |
5105 | } | |
5106 | } | |
5107 | ||
5108 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5109 | const char *name) | |
5110 | { | |
5111 | mdk_thread_t *thread; | |
1da177e4 | 5112 | |
9ffae0cf | 5113 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5114 | if (!thread) |
5115 | return NULL; | |
5116 | ||
1da177e4 LT |
5117 | init_waitqueue_head(&thread->wqueue); |
5118 | ||
1da177e4 LT |
5119 | thread->run = run; |
5120 | thread->mddev = mddev; | |
32a7627c | 5121 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5122 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5123 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5124 | kfree(thread); |
5125 | return NULL; | |
5126 | } | |
1da177e4 LT |
5127 | return thread; |
5128 | } | |
5129 | ||
1da177e4 LT |
5130 | void md_unregister_thread(mdk_thread_t *thread) |
5131 | { | |
ba25f9dc | 5132 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5133 | |
5134 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5135 | kfree(thread); |
5136 | } | |
5137 | ||
5138 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5139 | { | |
5140 | if (!mddev) { | |
5141 | MD_BUG(); | |
5142 | return; | |
5143 | } | |
5144 | ||
b2d444d7 | 5145 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5146 | return; |
6bfe0b49 DW |
5147 | |
5148 | if (mddev->external) | |
5149 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5150 | /* |
1da177e4 LT |
5151 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5152 | mdname(mddev), | |
5153 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5154 | __builtin_return_address(0),__builtin_return_address(1), | |
5155 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5156 | */ |
d0a0a5ee AM |
5157 | if (!mddev->pers) |
5158 | return; | |
1da177e4 LT |
5159 | if (!mddev->pers->error_handler) |
5160 | return; | |
5161 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5162 | if (mddev->degraded) |
5163 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5164 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5165 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5166 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5167 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5168 | md_new_event_inintr(mddev); |
1da177e4 LT |
5169 | } |
5170 | ||
5171 | /* seq_file implementation /proc/mdstat */ | |
5172 | ||
5173 | static void status_unused(struct seq_file *seq) | |
5174 | { | |
5175 | int i = 0; | |
5176 | mdk_rdev_t *rdev; | |
5177 | struct list_head *tmp; | |
5178 | ||
5179 | seq_printf(seq, "unused devices: "); | |
5180 | ||
73c34431 | 5181 | rdev_for_each_list(rdev, tmp, pending_raid_disks) { |
1da177e4 LT |
5182 | char b[BDEVNAME_SIZE]; |
5183 | i++; | |
5184 | seq_printf(seq, "%s ", | |
5185 | bdevname(rdev->bdev,b)); | |
5186 | } | |
5187 | if (!i) | |
5188 | seq_printf(seq, "<none>"); | |
5189 | ||
5190 | seq_printf(seq, "\n"); | |
5191 | } | |
5192 | ||
5193 | ||
5194 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5195 | { | |
4588b42e N |
5196 | sector_t max_blocks, resync, res; |
5197 | unsigned long dt, db, rt; | |
5198 | int scale; | |
5199 | unsigned int per_milli; | |
1da177e4 LT |
5200 | |
5201 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
5202 | ||
5203 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5204 | max_blocks = mddev->resync_max_sectors >> 1; | |
5205 | else | |
5206 | max_blocks = mddev->size; | |
5207 | ||
5208 | /* | |
5209 | * Should not happen. | |
5210 | */ | |
5211 | if (!max_blocks) { | |
5212 | MD_BUG(); | |
5213 | return; | |
5214 | } | |
4588b42e N |
5215 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
5216 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
5217 | * u32, as those are the requirements for sector_div. | |
5218 | * Thus 'scale' must be at least 10 | |
5219 | */ | |
5220 | scale = 10; | |
5221 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5222 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
5223 | scale++; | |
5224 | } | |
5225 | res = (resync>>scale)*1000; | |
5226 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
5227 | ||
5228 | per_milli = res; | |
1da177e4 | 5229 | { |
4588b42e | 5230 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5231 | seq_printf(seq, "["); |
5232 | for (i = 0; i < x; i++) | |
5233 | seq_printf(seq, "="); | |
5234 | seq_printf(seq, ">"); | |
5235 | for (i = 0; i < y; i++) | |
5236 | seq_printf(seq, "."); | |
5237 | seq_printf(seq, "] "); | |
5238 | } | |
4588b42e | 5239 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5240 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5241 | "reshape" : | |
61df9d91 N |
5242 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5243 | "check" : | |
5244 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5245 | "resync" : "recovery"))), | |
5246 | per_milli/10, per_milli % 10, | |
4588b42e N |
5247 | (unsigned long long) resync, |
5248 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5249 | |
5250 | /* | |
5251 | * We do not want to overflow, so the order of operands and | |
5252 | * the * 100 / 100 trick are important. We do a +1 to be | |
5253 | * safe against division by zero. We only estimate anyway. | |
5254 | * | |
5255 | * dt: time from mark until now | |
5256 | * db: blocks written from mark until now | |
5257 | * rt: remaining time | |
5258 | */ | |
5259 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5260 | if (!dt) dt++; | |
ff4e8d9a N |
5261 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5262 | - mddev->resync_mark_cnt; | |
5263 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5264 | |
5265 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5266 | ||
ff4e8d9a | 5267 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5268 | } |
5269 | ||
5270 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5271 | { | |
5272 | struct list_head *tmp; | |
5273 | loff_t l = *pos; | |
5274 | mddev_t *mddev; | |
5275 | ||
5276 | if (l >= 0x10000) | |
5277 | return NULL; | |
5278 | if (!l--) | |
5279 | /* header */ | |
5280 | return (void*)1; | |
5281 | ||
5282 | spin_lock(&all_mddevs_lock); | |
5283 | list_for_each(tmp,&all_mddevs) | |
5284 | if (!l--) { | |
5285 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5286 | mddev_get(mddev); | |
5287 | spin_unlock(&all_mddevs_lock); | |
5288 | return mddev; | |
5289 | } | |
5290 | spin_unlock(&all_mddevs_lock); | |
5291 | if (!l--) | |
5292 | return (void*)2;/* tail */ | |
5293 | return NULL; | |
5294 | } | |
5295 | ||
5296 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5297 | { | |
5298 | struct list_head *tmp; | |
5299 | mddev_t *next_mddev, *mddev = v; | |
5300 | ||
5301 | ++*pos; | |
5302 | if (v == (void*)2) | |
5303 | return NULL; | |
5304 | ||
5305 | spin_lock(&all_mddevs_lock); | |
5306 | if (v == (void*)1) | |
5307 | tmp = all_mddevs.next; | |
5308 | else | |
5309 | tmp = mddev->all_mddevs.next; | |
5310 | if (tmp != &all_mddevs) | |
5311 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5312 | else { | |
5313 | next_mddev = (void*)2; | |
5314 | *pos = 0x10000; | |
5315 | } | |
5316 | spin_unlock(&all_mddevs_lock); | |
5317 | ||
5318 | if (v != (void*)1) | |
5319 | mddev_put(mddev); | |
5320 | return next_mddev; | |
5321 | ||
5322 | } | |
5323 | ||
5324 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5325 | { | |
5326 | mddev_t *mddev = v; | |
5327 | ||
5328 | if (mddev && v != (void*)1 && v != (void*)2) | |
5329 | mddev_put(mddev); | |
5330 | } | |
5331 | ||
d7603b7e N |
5332 | struct mdstat_info { |
5333 | int event; | |
5334 | }; | |
5335 | ||
1da177e4 LT |
5336 | static int md_seq_show(struct seq_file *seq, void *v) |
5337 | { | |
5338 | mddev_t *mddev = v; | |
5339 | sector_t size; | |
5340 | struct list_head *tmp2; | |
5341 | mdk_rdev_t *rdev; | |
d7603b7e | 5342 | struct mdstat_info *mi = seq->private; |
32a7627c | 5343 | struct bitmap *bitmap; |
1da177e4 LT |
5344 | |
5345 | if (v == (void*)1) { | |
2604b703 | 5346 | struct mdk_personality *pers; |
1da177e4 LT |
5347 | seq_printf(seq, "Personalities : "); |
5348 | spin_lock(&pers_lock); | |
2604b703 N |
5349 | list_for_each_entry(pers, &pers_list, list) |
5350 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5351 | |
5352 | spin_unlock(&pers_lock); | |
5353 | seq_printf(seq, "\n"); | |
d7603b7e | 5354 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5355 | return 0; |
5356 | } | |
5357 | if (v == (void*)2) { | |
5358 | status_unused(seq); | |
5359 | return 0; | |
5360 | } | |
5361 | ||
5dc5cf7d | 5362 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5363 | return -EINTR; |
5dc5cf7d | 5364 | |
1da177e4 LT |
5365 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5366 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5367 | mddev->pers ? "" : "in"); | |
5368 | if (mddev->pers) { | |
f91de92e | 5369 | if (mddev->ro==1) |
1da177e4 | 5370 | seq_printf(seq, " (read-only)"); |
f91de92e | 5371 | if (mddev->ro==2) |
52720ae7 | 5372 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5373 | seq_printf(seq, " %s", mddev->pers->name); |
5374 | } | |
5375 | ||
5376 | size = 0; | |
d089c6af | 5377 | rdev_for_each(rdev, tmp2, mddev) { |
1da177e4 LT |
5378 | char b[BDEVNAME_SIZE]; |
5379 | seq_printf(seq, " %s[%d]", | |
5380 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5381 | if (test_bit(WriteMostly, &rdev->flags)) |
5382 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5383 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5384 | seq_printf(seq, "(F)"); |
5385 | continue; | |
b325a32e N |
5386 | } else if (rdev->raid_disk < 0) |
5387 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
5388 | size += rdev->size; |
5389 | } | |
5390 | ||
5391 | if (!list_empty(&mddev->disks)) { | |
5392 | if (mddev->pers) | |
5393 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
5394 | (unsigned long long) |
5395 | mddev->array_sectors / 2); | |
1da177e4 LT |
5396 | else |
5397 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c | 5398 | (unsigned long long)size); |
1da177e4 | 5399 | } |
1cd6bf19 N |
5400 | if (mddev->persistent) { |
5401 | if (mddev->major_version != 0 || | |
5402 | mddev->minor_version != 90) { | |
5403 | seq_printf(seq," super %d.%d", | |
5404 | mddev->major_version, | |
5405 | mddev->minor_version); | |
5406 | } | |
e691063a N |
5407 | } else if (mddev->external) |
5408 | seq_printf(seq, " super external:%s", | |
5409 | mddev->metadata_type); | |
5410 | else | |
1cd6bf19 | 5411 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5412 | |
5413 | if (mddev->pers) { | |
d710e138 | 5414 | mddev->pers->status(seq, mddev); |
1da177e4 | 5415 | seq_printf(seq, "\n "); |
8e1b39d6 N |
5416 | if (mddev->pers->sync_request) { |
5417 | if (mddev->curr_resync > 2) { | |
d710e138 | 5418 | status_resync(seq, mddev); |
8e1b39d6 N |
5419 | seq_printf(seq, "\n "); |
5420 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5421 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5422 | else if (mddev->recovery_cp < MaxSector) | |
5423 | seq_printf(seq, "\tresync=PENDING\n "); | |
5424 | } | |
32a7627c N |
5425 | } else |
5426 | seq_printf(seq, "\n "); | |
5427 | ||
5428 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5429 | unsigned long chunk_kb; |
5430 | unsigned long flags; | |
32a7627c N |
5431 | spin_lock_irqsave(&bitmap->lock, flags); |
5432 | chunk_kb = bitmap->chunksize >> 10; | |
5433 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5434 | "%lu%s chunk", | |
5435 | bitmap->pages - bitmap->missing_pages, | |
5436 | bitmap->pages, | |
5437 | (bitmap->pages - bitmap->missing_pages) | |
5438 | << (PAGE_SHIFT - 10), | |
5439 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5440 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5441 | if (bitmap->file) { |
5442 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5443 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5444 | } |
78d742d8 | 5445 | |
32a7627c N |
5446 | seq_printf(seq, "\n"); |
5447 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5448 | } |
5449 | ||
5450 | seq_printf(seq, "\n"); | |
5451 | } | |
5452 | mddev_unlock(mddev); | |
5453 | ||
5454 | return 0; | |
5455 | } | |
5456 | ||
5457 | static struct seq_operations md_seq_ops = { | |
5458 | .start = md_seq_start, | |
5459 | .next = md_seq_next, | |
5460 | .stop = md_seq_stop, | |
5461 | .show = md_seq_show, | |
5462 | }; | |
5463 | ||
5464 | static int md_seq_open(struct inode *inode, struct file *file) | |
5465 | { | |
5466 | int error; | |
d7603b7e N |
5467 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5468 | if (mi == NULL) | |
5469 | return -ENOMEM; | |
1da177e4 LT |
5470 | |
5471 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5472 | if (error) |
5473 | kfree(mi); | |
5474 | else { | |
5475 | struct seq_file *p = file->private_data; | |
5476 | p->private = mi; | |
5477 | mi->event = atomic_read(&md_event_count); | |
5478 | } | |
1da177e4 LT |
5479 | return error; |
5480 | } | |
5481 | ||
d7603b7e N |
5482 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5483 | { | |
5484 | struct seq_file *m = filp->private_data; | |
5485 | struct mdstat_info *mi = m->private; | |
5486 | int mask; | |
5487 | ||
5488 | poll_wait(filp, &md_event_waiters, wait); | |
5489 | ||
5490 | /* always allow read */ | |
5491 | mask = POLLIN | POLLRDNORM; | |
5492 | ||
5493 | if (mi->event != atomic_read(&md_event_count)) | |
5494 | mask |= POLLERR | POLLPRI; | |
5495 | return mask; | |
5496 | } | |
5497 | ||
fa027c2a | 5498 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5499 | .owner = THIS_MODULE, |
1da177e4 LT |
5500 | .open = md_seq_open, |
5501 | .read = seq_read, | |
5502 | .llseek = seq_lseek, | |
c3f94b40 | 5503 | .release = seq_release_private, |
d7603b7e | 5504 | .poll = mdstat_poll, |
1da177e4 LT |
5505 | }; |
5506 | ||
2604b703 | 5507 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5508 | { |
1da177e4 | 5509 | spin_lock(&pers_lock); |
2604b703 N |
5510 | list_add_tail(&p->list, &pers_list); |
5511 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5512 | spin_unlock(&pers_lock); |
5513 | return 0; | |
5514 | } | |
5515 | ||
2604b703 | 5516 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5517 | { |
2604b703 | 5518 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5519 | spin_lock(&pers_lock); |
2604b703 | 5520 | list_del_init(&p->list); |
1da177e4 LT |
5521 | spin_unlock(&pers_lock); |
5522 | return 0; | |
5523 | } | |
5524 | ||
5525 | static int is_mddev_idle(mddev_t *mddev) | |
5526 | { | |
5527 | mdk_rdev_t * rdev; | |
1da177e4 | 5528 | int idle; |
713f6ab1 | 5529 | long curr_events; |
1da177e4 LT |
5530 | |
5531 | idle = 1; | |
4b80991c N |
5532 | rcu_read_lock(); |
5533 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5534 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
074a7aca TH |
5535 | curr_events = part_stat_read(&disk->part0, sectors[0]) + |
5536 | part_stat_read(&disk->part0, sectors[1]) - | |
1da177e4 | 5537 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5538 | /* sync IO will cause sync_io to increase before the disk_stats |
5539 | * as sync_io is counted when a request starts, and | |
5540 | * disk_stats is counted when it completes. | |
5541 | * So resync activity will cause curr_events to be smaller than | |
5542 | * when there was no such activity. | |
5543 | * non-sync IO will cause disk_stat to increase without | |
5544 | * increasing sync_io so curr_events will (eventually) | |
5545 | * be larger than it was before. Once it becomes | |
5546 | * substantially larger, the test below will cause | |
5547 | * the array to appear non-idle, and resync will slow | |
5548 | * down. | |
5549 | * If there is a lot of outstanding resync activity when | |
5550 | * we set last_event to curr_events, then all that activity | |
5551 | * completing might cause the array to appear non-idle | |
5552 | * and resync will be slowed down even though there might | |
5553 | * not have been non-resync activity. This will only | |
5554 | * happen once though. 'last_events' will soon reflect | |
5555 | * the state where there is little or no outstanding | |
5556 | * resync requests, and further resync activity will | |
5557 | * always make curr_events less than last_events. | |
c0e48521 | 5558 | * |
1da177e4 | 5559 | */ |
713f6ab1 | 5560 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5561 | rdev->last_events = curr_events; |
5562 | idle = 0; | |
5563 | } | |
5564 | } | |
4b80991c | 5565 | rcu_read_unlock(); |
1da177e4 LT |
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; | |
9744197c N |
5747 | /* We need to wait 'interruptible' so as not to |
5748 | * contribute to the load average, and not to | |
5749 | * be caught by 'softlockup' | |
5750 | */ | |
5751 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 5752 | if (!kthread_should_stop() && |
8712e553 | 5753 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5754 | printk(KERN_INFO "md: delaying %s of %s" |
5755 | " until %s has finished (they" | |
1da177e4 | 5756 | " share one or more physical units)\n", |
61df9d91 | 5757 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 5758 | mddev_put(mddev2); |
9744197c N |
5759 | if (signal_pending(current)) |
5760 | flush_signals(current); | |
1da177e4 LT |
5761 | schedule(); |
5762 | finish_wait(&resync_wait, &wq); | |
5763 | goto try_again; | |
5764 | } | |
5765 | finish_wait(&resync_wait, &wq); | |
5766 | } | |
5767 | } | |
5768 | } while (mddev->curr_resync < 2); | |
5769 | ||
5fd6c1dc | 5770 | j = 0; |
9d88883e | 5771 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5772 | /* resync follows the size requested by the personality, |
57afd89f | 5773 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5774 | */ |
5775 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5776 | mddev->resync_mismatches = 0; |
5fd6c1dc | 5777 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
5778 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
5779 | j = mddev->resync_min; | |
5780 | else if (!mddev->bitmap) | |
5fd6c1dc | 5781 | j = mddev->recovery_cp; |
5e96ee65 | 5782 | |
ccfcc3c1 N |
5783 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5784 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5785 | else { |
1da177e4 LT |
5786 | /* recovery follows the physical size of devices */ |
5787 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5788 | j = MaxSector; |
d089c6af | 5789 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
5790 | if (rdev->raid_disk >= 0 && |
5791 | !test_bit(Faulty, &rdev->flags) && | |
5792 | !test_bit(In_sync, &rdev->flags) && | |
5793 | rdev->recovery_offset < j) | |
5794 | j = rdev->recovery_offset; | |
5795 | } | |
1da177e4 | 5796 | |
61df9d91 N |
5797 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5798 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5799 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5800 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5801 | "(but not more than %d KB/sec) for %s.\n", |
5802 | speed_max(mddev), desc); | |
1da177e4 LT |
5803 | |
5804 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5805 | |
57afd89f | 5806 | io_sectors = 0; |
1da177e4 LT |
5807 | for (m = 0; m < SYNC_MARKS; m++) { |
5808 | mark[m] = jiffies; | |
57afd89f | 5809 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5810 | } |
5811 | last_mark = 0; | |
5812 | mddev->resync_mark = mark[last_mark]; | |
5813 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
5814 | ||
5815 | /* | |
5816 | * Tune reconstruction: | |
5817 | */ | |
5818 | window = 32*(PAGE_SIZE/512); | |
5819 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
5820 | window/2,(unsigned long long) max_sectors/2); | |
5821 | ||
5822 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
5823 | last_check = 0; |
5824 | ||
5825 | if (j>2) { | |
5826 | printk(KERN_INFO | |
61df9d91 N |
5827 | "md: resuming %s of %s from checkpoint.\n", |
5828 | desc, mdname(mddev)); | |
1da177e4 LT |
5829 | mddev->curr_resync = j; |
5830 | } | |
5831 | ||
5832 | while (j < max_sectors) { | |
57afd89f | 5833 | sector_t sectors; |
1da177e4 | 5834 | |
57afd89f | 5835 | skipped = 0; |
c6207277 N |
5836 | if (j >= mddev->resync_max) { |
5837 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
5838 | wait_event(mddev->recovery_wait, | |
5839 | mddev->resync_max > j | |
5840 | || kthread_should_stop()); | |
5841 | } | |
5842 | if (kthread_should_stop()) | |
5843 | goto interrupted; | |
57afd89f | 5844 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 5845 | currspeed < speed_min(mddev)); |
57afd89f | 5846 | if (sectors == 0) { |
dfc70645 | 5847 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5848 | goto out; |
5849 | } | |
57afd89f N |
5850 | |
5851 | if (!skipped) { /* actual IO requested */ | |
5852 | io_sectors += sectors; | |
5853 | atomic_add(sectors, &mddev->recovery_active); | |
5854 | } | |
5855 | ||
1da177e4 LT |
5856 | j += sectors; |
5857 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 5858 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
5859 | if (last_check == 0) |
5860 | /* this is the earliers that rebuilt will be | |
5861 | * visible in /proc/mdstat | |
5862 | */ | |
5863 | md_new_event(mddev); | |
57afd89f N |
5864 | |
5865 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
5866 | continue; |
5867 | ||
57afd89f | 5868 | last_check = io_sectors; |
1da177e4 | 5869 | |
dfc70645 | 5870 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
5871 | break; |
5872 | ||
5873 | repeat: | |
5874 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
5875 | /* step marks */ | |
5876 | int next = (last_mark+1) % SYNC_MARKS; | |
5877 | ||
5878 | mddev->resync_mark = mark[next]; | |
5879 | mddev->resync_mark_cnt = mark_cnt[next]; | |
5880 | mark[next] = jiffies; | |
57afd89f | 5881 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5882 | last_mark = next; |
5883 | } | |
5884 | ||
5885 | ||
c6207277 N |
5886 | if (kthread_should_stop()) |
5887 | goto interrupted; | |
5888 | ||
1da177e4 LT |
5889 | |
5890 | /* | |
5891 | * this loop exits only if either when we are slower than | |
5892 | * the 'hard' speed limit, or the system was IO-idle for | |
5893 | * a jiffy. | |
5894 | * the system might be non-idle CPU-wise, but we only care | |
5895 | * about not overloading the IO subsystem. (things like an | |
5896 | * e2fsck being done on the RAID array should execute fast) | |
5897 | */ | |
2ad8b1ef | 5898 | blk_unplug(mddev->queue); |
1da177e4 LT |
5899 | cond_resched(); |
5900 | ||
57afd89f N |
5901 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
5902 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 5903 | |
88202a0c N |
5904 | if (currspeed > speed_min(mddev)) { |
5905 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 5906 | !is_mddev_idle(mddev)) { |
c0e48521 | 5907 | msleep(500); |
1da177e4 LT |
5908 | goto repeat; |
5909 | } | |
5910 | } | |
5911 | } | |
61df9d91 | 5912 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
5913 | /* |
5914 | * this also signals 'finished resyncing' to md_stop | |
5915 | */ | |
5916 | out: | |
2ad8b1ef | 5917 | blk_unplug(mddev->queue); |
1da177e4 LT |
5918 | |
5919 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
5920 | ||
5921 | /* tell personality that we are finished */ | |
57afd89f | 5922 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 5923 | |
dfc70645 | 5924 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
5925 | mddev->curr_resync > 2) { |
5926 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
5927 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5928 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
5929 | printk(KERN_INFO | |
61df9d91 N |
5930 | "md: checkpointing %s of %s.\n", |
5931 | desc, mdname(mddev)); | |
5fd6c1dc N |
5932 | mddev->recovery_cp = mddev->curr_resync; |
5933 | } | |
5934 | } else | |
5935 | mddev->recovery_cp = MaxSector; | |
5936 | } else { | |
5937 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5938 | mddev->curr_resync = MaxSector; | |
d089c6af | 5939 | rdev_for_each(rdev, rtmp, mddev) |
5fd6c1dc N |
5940 | if (rdev->raid_disk >= 0 && |
5941 | !test_bit(Faulty, &rdev->flags) && | |
5942 | !test_bit(In_sync, &rdev->flags) && | |
5943 | rdev->recovery_offset < mddev->curr_resync) | |
5944 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 5945 | } |
1da177e4 | 5946 | } |
17571284 | 5947 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5948 | |
1da177e4 LT |
5949 | skip: |
5950 | mddev->curr_resync = 0; | |
5e96ee65 | 5951 | mddev->resync_min = 0; |
c6207277 N |
5952 | mddev->resync_max = MaxSector; |
5953 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
5954 | wake_up(&resync_wait); |
5955 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
5956 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
5957 | return; |
5958 | ||
5959 | interrupted: | |
5960 | /* | |
5961 | * got a signal, exit. | |
5962 | */ | |
5963 | printk(KERN_INFO | |
5964 | "md: md_do_sync() got signal ... exiting\n"); | |
5965 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5966 | goto out; | |
5967 | ||
1da177e4 | 5968 | } |
29269553 | 5969 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
5970 | |
5971 | ||
b4c4c7b8 N |
5972 | static int remove_and_add_spares(mddev_t *mddev) |
5973 | { | |
5974 | mdk_rdev_t *rdev; | |
5975 | struct list_head *rtmp; | |
5976 | int spares = 0; | |
5977 | ||
d089c6af | 5978 | rdev_for_each(rdev, rtmp, mddev) |
b4c4c7b8 | 5979 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 5980 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
5981 | (test_bit(Faulty, &rdev->flags) || |
5982 | ! test_bit(In_sync, &rdev->flags)) && | |
5983 | atomic_read(&rdev->nr_pending)==0) { | |
5984 | if (mddev->pers->hot_remove_disk( | |
5985 | mddev, rdev->raid_disk)==0) { | |
5986 | char nm[20]; | |
5987 | sprintf(nm,"rd%d", rdev->raid_disk); | |
5988 | sysfs_remove_link(&mddev->kobj, nm); | |
5989 | rdev->raid_disk = -1; | |
5990 | } | |
5991 | } | |
5992 | ||
c89a8eee | 5993 | if (mddev->degraded && ! mddev->ro) { |
dfc70645 N |
5994 | rdev_for_each(rdev, rtmp, mddev) { |
5995 | if (rdev->raid_disk >= 0 && | |
e5427135 DW |
5996 | !test_bit(In_sync, &rdev->flags) && |
5997 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 5998 | spares++; |
b4c4c7b8 N |
5999 | if (rdev->raid_disk < 0 |
6000 | && !test_bit(Faulty, &rdev->flags)) { | |
6001 | rdev->recovery_offset = 0; | |
199050ea NB |
6002 | if (mddev->pers-> |
6003 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6004 | char nm[20]; |
6005 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6006 | if (sysfs_create_link(&mddev->kobj, |
6007 | &rdev->kobj, nm)) | |
6008 | printk(KERN_WARNING | |
6009 | "md: cannot register " | |
6010 | "%s for %s\n", | |
6011 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6012 | spares++; |
6013 | md_new_event(mddev); | |
6014 | } else | |
6015 | break; | |
6016 | } | |
dfc70645 | 6017 | } |
b4c4c7b8 N |
6018 | } |
6019 | return spares; | |
6020 | } | |
1da177e4 LT |
6021 | /* |
6022 | * This routine is regularly called by all per-raid-array threads to | |
6023 | * deal with generic issues like resync and super-block update. | |
6024 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6025 | * need this as they never do any recovery or update the superblock. | |
6026 | * | |
6027 | * It does not do any resync itself, but rather "forks" off other threads | |
6028 | * to do that as needed. | |
6029 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6030 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6031 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6032 | * and wakeups up this thread which will reap the thread and finish up. |
6033 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6034 | * | |
6035 | * The overall approach is: | |
6036 | * 1/ if the superblock needs updating, update it. | |
6037 | * 2/ If a recovery thread is running, don't do anything else. | |
6038 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6039 | * 4/ If there are any faulty devices, remove them. | |
6040 | * 5/ If array is degraded, try to add spares devices | |
6041 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6042 | */ | |
6043 | void md_check_recovery(mddev_t *mddev) | |
6044 | { | |
6045 | mdk_rdev_t *rdev; | |
6046 | struct list_head *rtmp; | |
6047 | ||
6048 | ||
5f40402d N |
6049 | if (mddev->bitmap) |
6050 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 | 6051 | |
d8e64406 DW |
6052 | if (test_and_clear_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags)) |
6053 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
6054 | ||
1da177e4 LT |
6055 | if (mddev->ro) |
6056 | return; | |
fca4d848 N |
6057 | |
6058 | if (signal_pending(current)) { | |
31a59e34 | 6059 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6060 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6061 | mdname(mddev)); | |
6062 | mddev->safemode = 2; | |
6063 | } | |
6064 | flush_signals(current); | |
6065 | } | |
6066 | ||
c89a8eee N |
6067 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6068 | return; | |
1da177e4 | 6069 | if ( ! ( |
e691063a | 6070 | (mddev->flags && !mddev->external) || |
1da177e4 | 6071 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6072 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6073 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6074 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6075 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6076 | )) |
6077 | return; | |
fca4d848 | 6078 | |
df5b89b3 | 6079 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6080 | int spares = 0; |
fca4d848 | 6081 | |
c89a8eee N |
6082 | if (mddev->ro) { |
6083 | /* Only thing we do on a ro array is remove | |
6084 | * failed devices. | |
6085 | */ | |
6086 | remove_and_add_spares(mddev); | |
6087 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6088 | goto unlock; | |
6089 | } | |
6090 | ||
31a59e34 | 6091 | if (!mddev->external) { |
0fd62b86 | 6092 | int did_change = 0; |
31a59e34 N |
6093 | spin_lock_irq(&mddev->write_lock); |
6094 | if (mddev->safemode && | |
6095 | !atomic_read(&mddev->writes_pending) && | |
6096 | !mddev->in_sync && | |
6097 | mddev->recovery_cp == MaxSector) { | |
6098 | mddev->in_sync = 1; | |
0fd62b86 | 6099 | did_change = 1; |
31a59e34 N |
6100 | if (mddev->persistent) |
6101 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6102 | } | |
6103 | if (mddev->safemode == 1) | |
6104 | mddev->safemode = 0; | |
6105 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 NB |
6106 | if (did_change) |
6107 | sysfs_notify(&mddev->kobj, NULL, "array_state"); | |
fca4d848 | 6108 | } |
fca4d848 | 6109 | |
850b2b42 N |
6110 | if (mddev->flags) |
6111 | md_update_sb(mddev, 0); | |
06d91a5f | 6112 | |
52664732 NB |
6113 | rdev_for_each(rdev, rtmp, mddev) |
6114 | if (test_and_clear_bit(StateChanged, &rdev->flags)) | |
6115 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
6116 | ||
06d91a5f | 6117 | |
1da177e4 LT |
6118 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6119 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6120 | /* resync/recovery still happening */ | |
6121 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6122 | goto unlock; | |
6123 | } | |
6124 | if (mddev->sync_thread) { | |
6125 | /* resync has finished, collect result */ | |
6126 | md_unregister_thread(mddev->sync_thread); | |
6127 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6128 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6129 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6130 | /* success...*/ |
6131 | /* activate any spares */ | |
a99ac971 NB |
6132 | if (mddev->pers->spare_active(mddev)) |
6133 | sysfs_notify(&mddev->kobj, NULL, | |
6134 | "degraded"); | |
1da177e4 | 6135 | } |
850b2b42 | 6136 | md_update_sb(mddev, 1); |
41158c7e N |
6137 | |
6138 | /* if array is no-longer degraded, then any saved_raid_disk | |
6139 | * information must be scrapped | |
6140 | */ | |
6141 | if (!mddev->degraded) | |
d089c6af | 6142 | rdev_for_each(rdev, rtmp, mddev) |
41158c7e N |
6143 | rdev->saved_raid_disk = -1; |
6144 | ||
1da177e4 LT |
6145 | mddev->recovery = 0; |
6146 | /* flag recovery needed just to double check */ | |
6147 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
72a23c21 | 6148 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
d7603b7e | 6149 | md_new_event(mddev); |
1da177e4 LT |
6150 | goto unlock; |
6151 | } | |
72a23c21 NB |
6152 | /* Set RUNNING before clearing NEEDED to avoid |
6153 | * any transients in the value of "sync_action". | |
6154 | */ | |
6155 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6156 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6157 | /* Clear some bits that don't mean anything, but |
6158 | * might be left set | |
6159 | */ | |
24dd469d N |
6160 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6161 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6162 | |
5fd6c1dc N |
6163 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6164 | goto unlock; | |
1da177e4 LT |
6165 | /* no recovery is running. |
6166 | * remove any failed drives, then | |
6167 | * add spares if possible. | |
6168 | * Spare are also removed and re-added, to allow | |
6169 | * the personality to fail the re-add. | |
6170 | */ | |
1da177e4 | 6171 | |
b4c4c7b8 N |
6172 | if (mddev->reshape_position != MaxSector) { |
6173 | if (mddev->pers->check_reshape(mddev) != 0) | |
6174 | /* Cannot proceed */ | |
6175 | goto unlock; | |
6176 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6177 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6178 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6179 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6180 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6181 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6182 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6183 | } else if (mddev->recovery_cp < MaxSector) { |
6184 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6185 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6186 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6187 | /* nothing to be done ... */ | |
1da177e4 | 6188 | goto unlock; |
24dd469d | 6189 | |
1da177e4 | 6190 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6191 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6192 | /* We are adding a device or devices to an array | |
6193 | * which has the bitmap stored on all devices. | |
6194 | * So make sure all bitmap pages get written | |
6195 | */ | |
6196 | bitmap_write_all(mddev->bitmap); | |
6197 | } | |
1da177e4 LT |
6198 | mddev->sync_thread = md_register_thread(md_do_sync, |
6199 | mddev, | |
6200 | "%s_resync"); | |
6201 | if (!mddev->sync_thread) { | |
6202 | printk(KERN_ERR "%s: could not start resync" | |
6203 | " thread...\n", | |
6204 | mdname(mddev)); | |
6205 | /* leave the spares where they are, it shouldn't hurt */ | |
6206 | mddev->recovery = 0; | |
d7603b7e | 6207 | } else |
1da177e4 | 6208 | md_wakeup_thread(mddev->sync_thread); |
72a23c21 | 6209 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
d7603b7e | 6210 | md_new_event(mddev); |
1da177e4 LT |
6211 | } |
6212 | unlock: | |
72a23c21 NB |
6213 | if (!mddev->sync_thread) { |
6214 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6215 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6216 | &mddev->recovery)) | |
6217 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); | |
6218 | } | |
1da177e4 LT |
6219 | mddev_unlock(mddev); |
6220 | } | |
6221 | } | |
6222 | ||
6bfe0b49 DW |
6223 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6224 | { | |
6225 | sysfs_notify(&rdev->kobj, NULL, "state"); | |
6226 | wait_event_timeout(rdev->blocked_wait, | |
6227 | !test_bit(Blocked, &rdev->flags), | |
6228 | msecs_to_jiffies(5000)); | |
6229 | rdev_dec_pending(rdev, mddev); | |
6230 | } | |
6231 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6232 | ||
75c96f85 AB |
6233 | static int md_notify_reboot(struct notifier_block *this, |
6234 | unsigned long code, void *x) | |
1da177e4 LT |
6235 | { |
6236 | struct list_head *tmp; | |
6237 | mddev_t *mddev; | |
6238 | ||
6239 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6240 | ||
6241 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6242 | ||
29ac4aa3 | 6243 | for_each_mddev(mddev, tmp) |
c71d4887 | 6244 | if (mddev_trylock(mddev)) { |
2b25000b N |
6245 | /* Force a switch to readonly even array |
6246 | * appears to still be in use. Hence | |
6247 | * the '100'. | |
6248 | */ | |
d710e138 | 6249 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
6250 | mddev_unlock(mddev); |
6251 | } | |
1da177e4 LT |
6252 | /* |
6253 | * certain more exotic SCSI devices are known to be | |
6254 | * volatile wrt too early system reboots. While the | |
6255 | * right place to handle this issue is the given | |
6256 | * driver, we do want to have a safe RAID driver ... | |
6257 | */ | |
6258 | mdelay(1000*1); | |
6259 | } | |
6260 | return NOTIFY_DONE; | |
6261 | } | |
6262 | ||
75c96f85 | 6263 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6264 | .notifier_call = md_notify_reboot, |
6265 | .next = NULL, | |
6266 | .priority = INT_MAX, /* before any real devices */ | |
6267 | }; | |
6268 | ||
6269 | static void md_geninit(void) | |
6270 | { | |
1da177e4 LT |
6271 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6272 | ||
c7705f34 | 6273 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6274 | } |
6275 | ||
75c96f85 | 6276 | static int __init md_init(void) |
1da177e4 | 6277 | { |
1da177e4 LT |
6278 | if (register_blkdev(MAJOR_NR, "md")) |
6279 | return -1; | |
6280 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
6281 | unregister_blkdev(MAJOR_NR, "md"); | |
6282 | return -1; | |
6283 | } | |
e8703fe1 N |
6284 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
6285 | md_probe, NULL, NULL); | |
6286 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6287 | md_probe, NULL, NULL); |
6288 | ||
1da177e4 | 6289 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6290 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6291 | |
6292 | md_geninit(); | |
d710e138 | 6293 | return 0; |
1da177e4 LT |
6294 | } |
6295 | ||
6296 | ||
6297 | #ifndef MODULE | |
6298 | ||
6299 | /* | |
6300 | * Searches all registered partitions for autorun RAID arrays | |
6301 | * at boot time. | |
6302 | */ | |
4d936ec1 ME |
6303 | |
6304 | static LIST_HEAD(all_detected_devices); | |
6305 | struct detected_devices_node { | |
6306 | struct list_head list; | |
6307 | dev_t dev; | |
6308 | }; | |
1da177e4 LT |
6309 | |
6310 | void md_autodetect_dev(dev_t dev) | |
6311 | { | |
4d936ec1 ME |
6312 | struct detected_devices_node *node_detected_dev; |
6313 | ||
6314 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6315 | if (node_detected_dev) { | |
6316 | node_detected_dev->dev = dev; | |
6317 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6318 | } else { | |
6319 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6320 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6321 | } | |
1da177e4 LT |
6322 | } |
6323 | ||
6324 | ||
6325 | static void autostart_arrays(int part) | |
6326 | { | |
6327 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6328 | struct detected_devices_node *node_detected_dev; |
6329 | dev_t dev; | |
6330 | int i_scanned, i_passed; | |
1da177e4 | 6331 | |
4d936ec1 ME |
6332 | i_scanned = 0; |
6333 | i_passed = 0; | |
1da177e4 | 6334 | |
4d936ec1 | 6335 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6336 | |
4d936ec1 ME |
6337 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6338 | i_scanned++; | |
6339 | node_detected_dev = list_entry(all_detected_devices.next, | |
6340 | struct detected_devices_node, list); | |
6341 | list_del(&node_detected_dev->list); | |
6342 | dev = node_detected_dev->dev; | |
6343 | kfree(node_detected_dev); | |
df968c4e | 6344 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6345 | if (IS_ERR(rdev)) |
6346 | continue; | |
6347 | ||
b2d444d7 | 6348 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6349 | MD_BUG(); |
6350 | continue; | |
6351 | } | |
d0fae18f | 6352 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6353 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6354 | i_passed++; |
1da177e4 | 6355 | } |
4d936ec1 ME |
6356 | |
6357 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6358 | i_scanned, i_passed); | |
1da177e4 LT |
6359 | |
6360 | autorun_devices(part); | |
6361 | } | |
6362 | ||
fdee8ae4 | 6363 | #endif /* !MODULE */ |
1da177e4 LT |
6364 | |
6365 | static __exit void md_exit(void) | |
6366 | { | |
6367 | mddev_t *mddev; | |
6368 | struct list_head *tmp; | |
8ab5e4c1 | 6369 | |
e8703fe1 N |
6370 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
6371 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
6372 | |
6373 | unregister_blkdev(MAJOR_NR,"md"); | |
6374 | unregister_blkdev(mdp_major, "mdp"); | |
6375 | unregister_reboot_notifier(&md_notifier); | |
6376 | unregister_sysctl_table(raid_table_header); | |
6377 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6378 | for_each_mddev(mddev, tmp) { |
1da177e4 LT |
6379 | struct gendisk *disk = mddev->gendisk; |
6380 | if (!disk) | |
6381 | continue; | |
6382 | export_array(mddev); | |
6383 | del_gendisk(disk); | |
6384 | put_disk(disk); | |
6385 | mddev->gendisk = NULL; | |
6386 | mddev_put(mddev); | |
6387 | } | |
6388 | } | |
6389 | ||
685784aa | 6390 | subsys_initcall(md_init); |
1da177e4 LT |
6391 | module_exit(md_exit) |
6392 | ||
f91de92e N |
6393 | static int get_ro(char *buffer, struct kernel_param *kp) |
6394 | { | |
6395 | return sprintf(buffer, "%d", start_readonly); | |
6396 | } | |
6397 | static int set_ro(const char *val, struct kernel_param *kp) | |
6398 | { | |
6399 | char *e; | |
6400 | int num = simple_strtoul(val, &e, 10); | |
6401 | if (*val && (*e == '\0' || *e == '\n')) { | |
6402 | start_readonly = num; | |
4dbcdc75 | 6403 | return 0; |
f91de92e N |
6404 | } |
6405 | return -EINVAL; | |
6406 | } | |
6407 | ||
80ca3a44 N |
6408 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6409 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6410 | |
f91de92e | 6411 | |
1da177e4 LT |
6412 | EXPORT_SYMBOL(register_md_personality); |
6413 | EXPORT_SYMBOL(unregister_md_personality); | |
6414 | EXPORT_SYMBOL(md_error); | |
6415 | EXPORT_SYMBOL(md_done_sync); | |
6416 | EXPORT_SYMBOL(md_write_start); | |
6417 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6418 | EXPORT_SYMBOL(md_register_thread); |
6419 | EXPORT_SYMBOL(md_unregister_thread); | |
6420 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6421 | EXPORT_SYMBOL(md_check_recovery); |
6422 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6423 | MODULE_ALIAS("md"); |
72008652 | 6424 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |