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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
50511da3 | 36 | #include <linux/kernel.h> |
a6fb0934 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
38 | #include <linux/linkage.h> |
39 | #include <linux/raid/md.h> | |
32a7627c | 40 | #include <linux/raid/bitmap.h> |
1da177e4 | 41 | #include <linux/sysctl.h> |
1da177e4 | 42 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 43 | #include <linux/poll.h> |
48c9c27b | 44 | #include <linux/mutex.h> |
16f17b39 | 45 | #include <linux/ctype.h> |
7dfb7103 | 46 | #include <linux/freezer.h> |
1da177e4 LT |
47 | |
48 | #include <linux/init.h> | |
49 | ||
32a7627c N |
50 | #include <linux/file.h> |
51 | ||
1da177e4 LT |
52 | #ifdef CONFIG_KMOD |
53 | #include <linux/kmod.h> | |
54 | #endif | |
55 | ||
56 | #include <asm/unaligned.h> | |
57 | ||
58 | #define MAJOR_NR MD_MAJOR | |
59 | #define MD_DRIVER | |
60 | ||
61 | /* 63 partitions with the alternate major number (mdp) */ | |
62 | #define MdpMinorShift 6 | |
63 | ||
64 | #define DEBUG 0 | |
65 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
66 | ||
67 | ||
68 | #ifndef MODULE | |
69 | static void autostart_arrays (int part); | |
70 | #endif | |
71 | ||
2604b703 | 72 | static LIST_HEAD(pers_list); |
1da177e4 LT |
73 | static DEFINE_SPINLOCK(pers_lock); |
74 | ||
5e56341d AB |
75 | static void md_print_devices(void); |
76 | ||
77 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } | |
78 | ||
1da177e4 LT |
79 | /* |
80 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
81 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
82 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 83 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
84 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
85 | * speed limit - in case reconstruction slows down your system despite | |
86 | * idle IO detection. | |
87 | * | |
88 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 89 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
90 | */ |
91 | ||
92 | static int sysctl_speed_limit_min = 1000; | |
93 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
94 | static inline int speed_min(mddev_t *mddev) |
95 | { | |
96 | return mddev->sync_speed_min ? | |
97 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
98 | } | |
99 | ||
100 | static inline int speed_max(mddev_t *mddev) | |
101 | { | |
102 | return mddev->sync_speed_max ? | |
103 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
104 | } | |
1da177e4 LT |
105 | |
106 | static struct ctl_table_header *raid_table_header; | |
107 | ||
108 | static ctl_table raid_table[] = { | |
109 | { | |
110 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
111 | .procname = "speed_limit_min", | |
112 | .data = &sysctl_speed_limit_min, | |
113 | .maxlen = sizeof(int), | |
80ca3a44 | 114 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
115 | .proc_handler = &proc_dointvec, |
116 | }, | |
117 | { | |
118 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
119 | .procname = "speed_limit_max", | |
120 | .data = &sysctl_speed_limit_max, | |
121 | .maxlen = sizeof(int), | |
80ca3a44 | 122 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
123 | .proc_handler = &proc_dointvec, |
124 | }, | |
125 | { .ctl_name = 0 } | |
126 | }; | |
127 | ||
128 | static ctl_table raid_dir_table[] = { | |
129 | { | |
130 | .ctl_name = DEV_RAID, | |
131 | .procname = "raid", | |
132 | .maxlen = 0, | |
80ca3a44 | 133 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
134 | .child = raid_table, |
135 | }, | |
136 | { .ctl_name = 0 } | |
137 | }; | |
138 | ||
139 | static ctl_table raid_root_table[] = { | |
140 | { | |
141 | .ctl_name = CTL_DEV, | |
142 | .procname = "dev", | |
143 | .maxlen = 0, | |
144 | .mode = 0555, | |
145 | .child = raid_dir_table, | |
146 | }, | |
147 | { .ctl_name = 0 } | |
148 | }; | |
149 | ||
150 | static struct block_device_operations md_fops; | |
151 | ||
f91de92e N |
152 | static int start_readonly; |
153 | ||
d7603b7e N |
154 | /* |
155 | * We have a system wide 'event count' that is incremented | |
156 | * on any 'interesting' event, and readers of /proc/mdstat | |
157 | * can use 'poll' or 'select' to find out when the event | |
158 | * count increases. | |
159 | * | |
160 | * Events are: | |
161 | * start array, stop array, error, add device, remove device, | |
162 | * start build, activate spare | |
163 | */ | |
2989ddbd | 164 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 165 | static atomic_t md_event_count; |
29269553 | 166 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
167 | { |
168 | atomic_inc(&md_event_count); | |
169 | wake_up(&md_event_waiters); | |
4508a7a7 | 170 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
d7603b7e | 171 | } |
29269553 | 172 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 173 | |
c331eb04 N |
174 | /* Alternate version that can be called from interrupts |
175 | * when calling sysfs_notify isn't needed. | |
176 | */ | |
05381954 | 177 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
178 | { |
179 | atomic_inc(&md_event_count); | |
180 | wake_up(&md_event_waiters); | |
181 | } | |
182 | ||
1da177e4 LT |
183 | /* |
184 | * Enables to iterate over all existing md arrays | |
185 | * all_mddevs_lock protects this list. | |
186 | */ | |
187 | static LIST_HEAD(all_mddevs); | |
188 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
189 | ||
190 | ||
191 | /* | |
192 | * iterates through all used mddevs in the system. | |
193 | * We take care to grab the all_mddevs_lock whenever navigating | |
194 | * the list, and to always hold a refcount when unlocked. | |
195 | * Any code which breaks out of this loop while own | |
196 | * a reference to the current mddev and must mddev_put it. | |
197 | */ | |
29ac4aa3 | 198 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
199 | \ |
200 | for (({ spin_lock(&all_mddevs_lock); \ | |
201 | tmp = all_mddevs.next; \ | |
202 | mddev = NULL;}); \ | |
203 | ({ if (tmp != &all_mddevs) \ | |
204 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
205 | spin_unlock(&all_mddevs_lock); \ | |
206 | if (mddev) mddev_put(mddev); \ | |
207 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
208 | tmp != &all_mddevs;}); \ | |
209 | ({ spin_lock(&all_mddevs_lock); \ | |
210 | tmp = tmp->next;}) \ | |
211 | ) | |
212 | ||
213 | ||
165125e1 | 214 | static int md_fail_request (struct request_queue *q, struct bio *bio) |
1da177e4 | 215 | { |
6712ecf8 | 216 | bio_io_error(bio); |
1da177e4 LT |
217 | return 0; |
218 | } | |
219 | ||
220 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
221 | { | |
222 | atomic_inc(&mddev->active); | |
223 | return mddev; | |
224 | } | |
225 | ||
226 | static void mddev_put(mddev_t *mddev) | |
227 | { | |
228 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
229 | return; | |
230 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
231 | list_del(&mddev->all_mddevs); | |
926ce2d8 | 232 | spin_unlock(&all_mddevs_lock); |
1312f40e | 233 | blk_cleanup_queue(mddev->queue); |
c10997f6 | 234 | kobject_put(&mddev->kobj); |
926ce2d8 N |
235 | } else |
236 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
237 | } |
238 | ||
239 | static mddev_t * mddev_find(dev_t unit) | |
240 | { | |
241 | mddev_t *mddev, *new = NULL; | |
242 | ||
243 | retry: | |
244 | spin_lock(&all_mddevs_lock); | |
245 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
246 | if (mddev->unit == unit) { | |
247 | mddev_get(mddev); | |
248 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 249 | kfree(new); |
1da177e4 LT |
250 | return mddev; |
251 | } | |
252 | ||
253 | if (new) { | |
254 | list_add(&new->all_mddevs, &all_mddevs); | |
255 | spin_unlock(&all_mddevs_lock); | |
256 | return new; | |
257 | } | |
258 | spin_unlock(&all_mddevs_lock); | |
259 | ||
9ffae0cf | 260 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
261 | if (!new) |
262 | return NULL; | |
263 | ||
1da177e4 LT |
264 | new->unit = unit; |
265 | if (MAJOR(unit) == MD_MAJOR) | |
266 | new->md_minor = MINOR(unit); | |
267 | else | |
268 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
269 | ||
df5b89b3 | 270 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
271 | INIT_LIST_HEAD(&new->disks); |
272 | INIT_LIST_HEAD(&new->all_mddevs); | |
273 | init_timer(&new->safemode_timer); | |
274 | atomic_set(&new->active, 1); | |
06d91a5f | 275 | spin_lock_init(&new->write_lock); |
3d310eb7 | 276 | init_waitqueue_head(&new->sb_wait); |
08a02ecd | 277 | new->reshape_position = MaxSector; |
c6207277 | 278 | new->resync_max = MaxSector; |
1da177e4 LT |
279 | |
280 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
281 | if (!new->queue) { | |
282 | kfree(new); | |
283 | return NULL; | |
284 | } | |
89e5c8b5 | 285 | set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags); |
1da177e4 LT |
286 | |
287 | blk_queue_make_request(new->queue, md_fail_request); | |
288 | ||
289 | goto retry; | |
290 | } | |
291 | ||
292 | static inline int mddev_lock(mddev_t * mddev) | |
293 | { | |
df5b89b3 | 294 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
295 | } |
296 | ||
1da177e4 LT |
297 | static inline int mddev_trylock(mddev_t * mddev) |
298 | { | |
df5b89b3 | 299 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
300 | } |
301 | ||
302 | static inline void mddev_unlock(mddev_t * mddev) | |
303 | { | |
df5b89b3 | 304 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 305 | |
005eca5e | 306 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
307 | } |
308 | ||
2989ddbd | 309 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 LT |
310 | { |
311 | mdk_rdev_t * rdev; | |
312 | struct list_head *tmp; | |
313 | ||
314 | ITERATE_RDEV(mddev,rdev,tmp) { | |
315 | if (rdev->desc_nr == nr) | |
316 | return rdev; | |
317 | } | |
318 | return NULL; | |
319 | } | |
320 | ||
321 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
322 | { | |
323 | struct list_head *tmp; | |
324 | mdk_rdev_t *rdev; | |
325 | ||
326 | ITERATE_RDEV(mddev,rdev,tmp) { | |
327 | if (rdev->bdev->bd_dev == dev) | |
328 | return rdev; | |
329 | } | |
330 | return NULL; | |
331 | } | |
332 | ||
d9d166c2 | 333 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
334 | { |
335 | struct mdk_personality *pers; | |
d9d166c2 N |
336 | list_for_each_entry(pers, &pers_list, list) { |
337 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 338 | return pers; |
d9d166c2 N |
339 | if (strcmp(pers->name, clevel)==0) |
340 | return pers; | |
341 | } | |
2604b703 N |
342 | return NULL; |
343 | } | |
344 | ||
77933d72 | 345 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
346 | { |
347 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
348 | return MD_NEW_SIZE_BLOCKS(size); | |
349 | } | |
350 | ||
351 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
352 | { | |
353 | sector_t size; | |
354 | ||
355 | size = rdev->sb_offset; | |
356 | ||
357 | if (chunk_size) | |
358 | size &= ~((sector_t)chunk_size/1024 - 1); | |
359 | return size; | |
360 | } | |
361 | ||
362 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
363 | { | |
364 | if (rdev->sb_page) | |
365 | MD_BUG(); | |
366 | ||
367 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
368 | if (!rdev->sb_page) { | |
369 | printk(KERN_ALERT "md: out of memory.\n"); | |
370 | return -EINVAL; | |
371 | } | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static void free_disk_sb(mdk_rdev_t * rdev) | |
377 | { | |
378 | if (rdev->sb_page) { | |
2d1f3b5d | 379 | put_page(rdev->sb_page); |
1da177e4 LT |
380 | rdev->sb_loaded = 0; |
381 | rdev->sb_page = NULL; | |
382 | rdev->sb_offset = 0; | |
383 | rdev->size = 0; | |
384 | } | |
385 | } | |
386 | ||
387 | ||
6712ecf8 | 388 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
389 | { |
390 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 391 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 392 | |
3a0f5bbb N |
393 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
394 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
395 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
396 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 397 | md_error(mddev, rdev); |
3a0f5bbb | 398 | } |
7bfa19f2 | 399 | |
a9701a30 N |
400 | if (atomic_dec_and_test(&mddev->pending_writes)) |
401 | wake_up(&mddev->sb_wait); | |
f8b58edf | 402 | bio_put(bio); |
7bfa19f2 N |
403 | } |
404 | ||
6712ecf8 | 405 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
406 | { |
407 | struct bio *bio2 = bio->bi_private; | |
408 | mdk_rdev_t *rdev = bio2->bi_private; | |
409 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
410 | |
411 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
412 | error == -EOPNOTSUPP) { | |
413 | unsigned long flags; | |
414 | /* barriers don't appear to be supported :-( */ | |
415 | set_bit(BarriersNotsupp, &rdev->flags); | |
416 | mddev->barriers_work = 0; | |
417 | spin_lock_irqsave(&mddev->write_lock, flags); | |
418 | bio2->bi_next = mddev->biolist; | |
419 | mddev->biolist = bio2; | |
420 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
421 | wake_up(&mddev->sb_wait); | |
422 | bio_put(bio); | |
6712ecf8 N |
423 | } else { |
424 | bio_put(bio2); | |
425 | bio->bi_private = rdev; | |
426 | super_written(bio, error); | |
a9701a30 | 427 | } |
a9701a30 N |
428 | } |
429 | ||
7bfa19f2 N |
430 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
431 | sector_t sector, int size, struct page *page) | |
432 | { | |
433 | /* write first size bytes of page to sector of rdev | |
434 | * Increment mddev->pending_writes before returning | |
435 | * and decrement it on completion, waking up sb_wait | |
436 | * if zero is reached. | |
437 | * If an error occurred, call md_error | |
a9701a30 N |
438 | * |
439 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
440 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
441 | */ |
442 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 443 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
444 | |
445 | bio->bi_bdev = rdev->bdev; | |
446 | bio->bi_sector = sector; | |
447 | bio_add_page(bio, page, size, 0); | |
448 | bio->bi_private = rdev; | |
449 | bio->bi_end_io = super_written; | |
a9701a30 N |
450 | bio->bi_rw = rw; |
451 | ||
7bfa19f2 | 452 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
453 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
454 | struct bio *rbio; | |
455 | rw |= (1<<BIO_RW_BARRIER); | |
456 | rbio = bio_clone(bio, GFP_NOIO); | |
457 | rbio->bi_private = bio; | |
458 | rbio->bi_end_io = super_written_barrier; | |
459 | submit_bio(rw, rbio); | |
460 | } else | |
461 | submit_bio(rw, bio); | |
462 | } | |
463 | ||
464 | void md_super_wait(mddev_t *mddev) | |
465 | { | |
466 | /* wait for all superblock writes that were scheduled to complete. | |
467 | * if any had to be retried (due to BARRIER problems), retry them | |
468 | */ | |
469 | DEFINE_WAIT(wq); | |
470 | for(;;) { | |
471 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
472 | if (atomic_read(&mddev->pending_writes)==0) | |
473 | break; | |
474 | while (mddev->biolist) { | |
475 | struct bio *bio; | |
476 | spin_lock_irq(&mddev->write_lock); | |
477 | bio = mddev->biolist; | |
478 | mddev->biolist = bio->bi_next ; | |
479 | bio->bi_next = NULL; | |
480 | spin_unlock_irq(&mddev->write_lock); | |
481 | submit_bio(bio->bi_rw, bio); | |
482 | } | |
483 | schedule(); | |
484 | } | |
485 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
486 | } |
487 | ||
6712ecf8 | 488 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 489 | { |
1da177e4 | 490 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
491 | } |
492 | ||
a654b9d8 | 493 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
494 | struct page *page, int rw) |
495 | { | |
baaa2c51 | 496 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
497 | struct completion event; |
498 | int ret; | |
499 | ||
500 | rw |= (1 << BIO_RW_SYNC); | |
501 | ||
502 | bio->bi_bdev = bdev; | |
503 | bio->bi_sector = sector; | |
504 | bio_add_page(bio, page, size, 0); | |
505 | init_completion(&event); | |
506 | bio->bi_private = &event; | |
507 | bio->bi_end_io = bi_complete; | |
508 | submit_bio(rw, bio); | |
509 | wait_for_completion(&event); | |
510 | ||
511 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
512 | bio_put(bio); | |
513 | return ret; | |
514 | } | |
a8745db2 | 515 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 516 | |
0002b271 | 517 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
518 | { |
519 | char b[BDEVNAME_SIZE]; | |
520 | if (!rdev->sb_page) { | |
521 | MD_BUG(); | |
522 | return -EINVAL; | |
523 | } | |
524 | if (rdev->sb_loaded) | |
525 | return 0; | |
526 | ||
527 | ||
0002b271 | 528 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
529 | goto fail; |
530 | rdev->sb_loaded = 1; | |
531 | return 0; | |
532 | ||
533 | fail: | |
534 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
535 | bdevname(rdev->bdev,b)); | |
536 | return -EINVAL; | |
537 | } | |
538 | ||
539 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
540 | { | |
541 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
542 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
543 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
544 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
545 | ||
546 | return 1; | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
551 | ||
552 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
553 | { | |
554 | int ret; | |
555 | mdp_super_t *tmp1, *tmp2; | |
556 | ||
557 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
558 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
559 | ||
560 | if (!tmp1 || !tmp2) { | |
561 | ret = 0; | |
562 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
563 | goto abort; | |
564 | } | |
565 | ||
566 | *tmp1 = *sb1; | |
567 | *tmp2 = *sb2; | |
568 | ||
569 | /* | |
570 | * nr_disks is not constant | |
571 | */ | |
572 | tmp1->nr_disks = 0; | |
573 | tmp2->nr_disks = 0; | |
574 | ||
575 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
576 | ret = 0; | |
577 | else | |
578 | ret = 1; | |
579 | ||
580 | abort: | |
990a8baf JJ |
581 | kfree(tmp1); |
582 | kfree(tmp2); | |
1da177e4 LT |
583 | return ret; |
584 | } | |
585 | ||
4d167f09 N |
586 | |
587 | static u32 md_csum_fold(u32 csum) | |
588 | { | |
589 | csum = (csum & 0xffff) + (csum >> 16); | |
590 | return (csum & 0xffff) + (csum >> 16); | |
591 | } | |
592 | ||
1da177e4 LT |
593 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
594 | { | |
4d167f09 N |
595 | u64 newcsum = 0; |
596 | u32 *sb32 = (u32*)sb; | |
597 | int i; | |
1da177e4 LT |
598 | unsigned int disk_csum, csum; |
599 | ||
600 | disk_csum = sb->sb_csum; | |
601 | sb->sb_csum = 0; | |
4d167f09 N |
602 | |
603 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
604 | newcsum += sb32[i]; | |
605 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
606 | ||
607 | ||
608 | #ifdef CONFIG_ALPHA | |
609 | /* This used to use csum_partial, which was wrong for several | |
610 | * reasons including that different results are returned on | |
611 | * different architectures. It isn't critical that we get exactly | |
612 | * the same return value as before (we always csum_fold before | |
613 | * testing, and that removes any differences). However as we | |
614 | * know that csum_partial always returned a 16bit value on | |
615 | * alphas, do a fold to maximise conformity to previous behaviour. | |
616 | */ | |
617 | sb->sb_csum = md_csum_fold(disk_csum); | |
618 | #else | |
1da177e4 | 619 | sb->sb_csum = disk_csum; |
4d167f09 | 620 | #endif |
1da177e4 LT |
621 | return csum; |
622 | } | |
623 | ||
624 | ||
625 | /* | |
626 | * Handle superblock details. | |
627 | * We want to be able to handle multiple superblock formats | |
628 | * so we have a common interface to them all, and an array of | |
629 | * different handlers. | |
630 | * We rely on user-space to write the initial superblock, and support | |
631 | * reading and updating of superblocks. | |
632 | * Interface methods are: | |
633 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
634 | * loads and validates a superblock on dev. | |
635 | * if refdev != NULL, compare superblocks on both devices | |
636 | * Return: | |
637 | * 0 - dev has a superblock that is compatible with refdev | |
638 | * 1 - dev has a superblock that is compatible and newer than refdev | |
639 | * so dev should be used as the refdev in future | |
640 | * -EINVAL superblock incompatible or invalid | |
641 | * -othererror e.g. -EIO | |
642 | * | |
643 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
644 | * Verify that dev is acceptable into mddev. | |
645 | * The first time, mddev->raid_disks will be 0, and data from | |
646 | * dev should be merged in. Subsequent calls check that dev | |
647 | * is new enough. Return 0 or -EINVAL | |
648 | * | |
649 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
650 | * Update the superblock for rdev with data in mddev | |
651 | * This does not write to disc. | |
652 | * | |
653 | */ | |
654 | ||
655 | struct super_type { | |
656 | char *name; | |
657 | struct module *owner; | |
658 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
659 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
660 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
661 | }; | |
662 | ||
663 | /* | |
664 | * load_super for 0.90.0 | |
665 | */ | |
666 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
667 | { | |
668 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
669 | mdp_super_t *sb; | |
670 | int ret; | |
671 | sector_t sb_offset; | |
672 | ||
673 | /* | |
674 | * Calculate the position of the superblock, | |
675 | * it's at the end of the disk. | |
676 | * | |
677 | * It also happens to be a multiple of 4Kb. | |
678 | */ | |
679 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
680 | rdev->sb_offset = sb_offset; | |
681 | ||
0002b271 | 682 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
683 | if (ret) return ret; |
684 | ||
685 | ret = -EINVAL; | |
686 | ||
687 | bdevname(rdev->bdev, b); | |
688 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
689 | ||
690 | if (sb->md_magic != MD_SB_MAGIC) { | |
691 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
692 | b); | |
693 | goto abort; | |
694 | } | |
695 | ||
696 | if (sb->major_version != 0 || | |
f6705578 N |
697 | sb->minor_version < 90 || |
698 | sb->minor_version > 91) { | |
1da177e4 LT |
699 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
700 | sb->major_version, sb->minor_version, | |
701 | b); | |
702 | goto abort; | |
703 | } | |
704 | ||
705 | if (sb->raid_disks <= 0) | |
706 | goto abort; | |
707 | ||
4d167f09 | 708 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
709 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
710 | b); | |
711 | goto abort; | |
712 | } | |
713 | ||
714 | rdev->preferred_minor = sb->md_minor; | |
715 | rdev->data_offset = 0; | |
0002b271 | 716 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 717 | |
e11e93fa N |
718 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
719 | if (sb->level != 1 && sb->level != 4 | |
720 | && sb->level != 5 && sb->level != 6 | |
721 | && sb->level != 10) { | |
722 | /* FIXME use a better test */ | |
723 | printk(KERN_WARNING | |
724 | "md: bitmaps not supported for this level.\n"); | |
725 | goto abort; | |
726 | } | |
727 | } | |
728 | ||
1da177e4 LT |
729 | if (sb->level == LEVEL_MULTIPATH) |
730 | rdev->desc_nr = -1; | |
731 | else | |
732 | rdev->desc_nr = sb->this_disk.number; | |
733 | ||
734 | if (refdev == 0) | |
735 | ret = 1; | |
736 | else { | |
737 | __u64 ev1, ev2; | |
738 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
739 | if (!uuid_equal(refsb, sb)) { | |
740 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
741 | b, bdevname(refdev->bdev,b2)); | |
742 | goto abort; | |
743 | } | |
744 | if (!sb_equal(refsb, sb)) { | |
745 | printk(KERN_WARNING "md: %s has same UUID" | |
746 | " but different superblock to %s\n", | |
747 | b, bdevname(refdev->bdev, b2)); | |
748 | goto abort; | |
749 | } | |
750 | ev1 = md_event(sb); | |
751 | ev2 = md_event(refsb); | |
752 | if (ev1 > ev2) | |
753 | ret = 1; | |
754 | else | |
755 | ret = 0; | |
756 | } | |
757 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
758 | ||
2bf071bf N |
759 | if (rdev->size < sb->size && sb->level > 1) |
760 | /* "this cannot possibly happen" ... */ | |
761 | ret = -EINVAL; | |
762 | ||
1da177e4 LT |
763 | abort: |
764 | return ret; | |
765 | } | |
766 | ||
767 | /* | |
768 | * validate_super for 0.90.0 | |
769 | */ | |
770 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
771 | { | |
772 | mdp_disk_t *desc; | |
773 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 774 | __u64 ev1 = md_event(sb); |
1da177e4 | 775 | |
41158c7e | 776 | rdev->raid_disk = -1; |
c5d79adb N |
777 | clear_bit(Faulty, &rdev->flags); |
778 | clear_bit(In_sync, &rdev->flags); | |
779 | clear_bit(WriteMostly, &rdev->flags); | |
780 | clear_bit(BarriersNotsupp, &rdev->flags); | |
781 | ||
1da177e4 LT |
782 | if (mddev->raid_disks == 0) { |
783 | mddev->major_version = 0; | |
784 | mddev->minor_version = sb->minor_version; | |
785 | mddev->patch_version = sb->patch_version; | |
e691063a | 786 | mddev->external = 0; |
1da177e4 LT |
787 | mddev->chunk_size = sb->chunk_size; |
788 | mddev->ctime = sb->ctime; | |
789 | mddev->utime = sb->utime; | |
790 | mddev->level = sb->level; | |
d9d166c2 | 791 | mddev->clevel[0] = 0; |
1da177e4 LT |
792 | mddev->layout = sb->layout; |
793 | mddev->raid_disks = sb->raid_disks; | |
794 | mddev->size = sb->size; | |
07d84d10 | 795 | mddev->events = ev1; |
9223214e | 796 | mddev->bitmap_offset = 0; |
36fa3063 | 797 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 798 | |
f6705578 N |
799 | if (mddev->minor_version >= 91) { |
800 | mddev->reshape_position = sb->reshape_position; | |
801 | mddev->delta_disks = sb->delta_disks; | |
802 | mddev->new_level = sb->new_level; | |
803 | mddev->new_layout = sb->new_layout; | |
804 | mddev->new_chunk = sb->new_chunk; | |
805 | } else { | |
806 | mddev->reshape_position = MaxSector; | |
807 | mddev->delta_disks = 0; | |
808 | mddev->new_level = mddev->level; | |
809 | mddev->new_layout = mddev->layout; | |
810 | mddev->new_chunk = mddev->chunk_size; | |
811 | } | |
812 | ||
1da177e4 LT |
813 | if (sb->state & (1<<MD_SB_CLEAN)) |
814 | mddev->recovery_cp = MaxSector; | |
815 | else { | |
816 | if (sb->events_hi == sb->cp_events_hi && | |
817 | sb->events_lo == sb->cp_events_lo) { | |
818 | mddev->recovery_cp = sb->recovery_cp; | |
819 | } else | |
820 | mddev->recovery_cp = 0; | |
821 | } | |
822 | ||
823 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
824 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
825 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
826 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
827 | ||
828 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
829 | |
830 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 831 | mddev->bitmap_file == NULL) |
36fa3063 | 832 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 833 | |
41158c7e N |
834 | } else if (mddev->pers == NULL) { |
835 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
836 | ++ev1; |
837 | if (ev1 < mddev->events) | |
838 | return -EINVAL; | |
41158c7e N |
839 | } else if (mddev->bitmap) { |
840 | /* if adding to array with a bitmap, then we can accept an | |
841 | * older device ... but not too old. | |
842 | */ | |
41158c7e N |
843 | if (ev1 < mddev->bitmap->events_cleared) |
844 | return 0; | |
07d84d10 N |
845 | } else { |
846 | if (ev1 < mddev->events) | |
847 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
848 | return 0; | |
849 | } | |
41158c7e | 850 | |
1da177e4 | 851 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
852 | desc = sb->disks + rdev->desc_nr; |
853 | ||
854 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 855 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
856 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
857 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 858 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
859 | rdev->raid_disk = desc->raid_disk; |
860 | } | |
8ddf9efe N |
861 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
862 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 863 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 864 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
865 | return 0; |
866 | } | |
867 | ||
868 | /* | |
869 | * sync_super for 0.90.0 | |
870 | */ | |
871 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
872 | { | |
873 | mdp_super_t *sb; | |
874 | struct list_head *tmp; | |
875 | mdk_rdev_t *rdev2; | |
876 | int next_spare = mddev->raid_disks; | |
19133a42 | 877 | |
1da177e4 LT |
878 | |
879 | /* make rdev->sb match mddev data.. | |
880 | * | |
881 | * 1/ zero out disks | |
882 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
883 | * 3/ any empty disks < next_spare become removed | |
884 | * | |
885 | * disks[0] gets initialised to REMOVED because | |
886 | * we cannot be sure from other fields if it has | |
887 | * been initialised or not. | |
888 | */ | |
889 | int i; | |
890 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
891 | ||
61181565 N |
892 | rdev->sb_size = MD_SB_BYTES; |
893 | ||
1da177e4 LT |
894 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
895 | ||
896 | memset(sb, 0, sizeof(*sb)); | |
897 | ||
898 | sb->md_magic = MD_SB_MAGIC; | |
899 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
900 | sb->patch_version = mddev->patch_version; |
901 | sb->gvalid_words = 0; /* ignored */ | |
902 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
903 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
904 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
905 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
906 | ||
907 | sb->ctime = mddev->ctime; | |
908 | sb->level = mddev->level; | |
909 | sb->size = mddev->size; | |
910 | sb->raid_disks = mddev->raid_disks; | |
911 | sb->md_minor = mddev->md_minor; | |
e691063a | 912 | sb->not_persistent = 0; |
1da177e4 LT |
913 | sb->utime = mddev->utime; |
914 | sb->state = 0; | |
915 | sb->events_hi = (mddev->events>>32); | |
916 | sb->events_lo = (u32)mddev->events; | |
917 | ||
f6705578 N |
918 | if (mddev->reshape_position == MaxSector) |
919 | sb->minor_version = 90; | |
920 | else { | |
921 | sb->minor_version = 91; | |
922 | sb->reshape_position = mddev->reshape_position; | |
923 | sb->new_level = mddev->new_level; | |
924 | sb->delta_disks = mddev->delta_disks; | |
925 | sb->new_layout = mddev->new_layout; | |
926 | sb->new_chunk = mddev->new_chunk; | |
927 | } | |
928 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
929 | if (mddev->in_sync) |
930 | { | |
931 | sb->recovery_cp = mddev->recovery_cp; | |
932 | sb->cp_events_hi = (mddev->events>>32); | |
933 | sb->cp_events_lo = (u32)mddev->events; | |
934 | if (mddev->recovery_cp == MaxSector) | |
935 | sb->state = (1<< MD_SB_CLEAN); | |
936 | } else | |
937 | sb->recovery_cp = 0; | |
938 | ||
939 | sb->layout = mddev->layout; | |
940 | sb->chunk_size = mddev->chunk_size; | |
941 | ||
a654b9d8 N |
942 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
943 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
944 | ||
1da177e4 LT |
945 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
946 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
947 | mdp_disk_t *d; | |
86e6ffdd | 948 | int desc_nr; |
b2d444d7 N |
949 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
950 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 951 | desc_nr = rdev2->raid_disk; |
1da177e4 | 952 | else |
86e6ffdd | 953 | desc_nr = next_spare++; |
19133a42 | 954 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
955 | d = &sb->disks[rdev2->desc_nr]; |
956 | nr_disks++; | |
957 | d->number = rdev2->desc_nr; | |
958 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
959 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
960 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
961 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
962 | d->raid_disk = rdev2->raid_disk; |
963 | else | |
964 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 965 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 966 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 967 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
968 | d->state = (1<<MD_DISK_ACTIVE); |
969 | d->state |= (1<<MD_DISK_SYNC); | |
970 | active++; | |
971 | working++; | |
972 | } else { | |
973 | d->state = 0; | |
974 | spare++; | |
975 | working++; | |
976 | } | |
8ddf9efe N |
977 | if (test_bit(WriteMostly, &rdev2->flags)) |
978 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 979 | } |
1da177e4 LT |
980 | /* now set the "removed" and "faulty" bits on any missing devices */ |
981 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
982 | mdp_disk_t *d = &sb->disks[i]; | |
983 | if (d->state == 0 && d->number == 0) { | |
984 | d->number = i; | |
985 | d->raid_disk = i; | |
986 | d->state = (1<<MD_DISK_REMOVED); | |
987 | d->state |= (1<<MD_DISK_FAULTY); | |
988 | failed++; | |
989 | } | |
990 | } | |
991 | sb->nr_disks = nr_disks; | |
992 | sb->active_disks = active; | |
993 | sb->working_disks = working; | |
994 | sb->failed_disks = failed; | |
995 | sb->spare_disks = spare; | |
996 | ||
997 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
998 | sb->sb_csum = calc_sb_csum(sb); | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * version 1 superblock | |
1003 | */ | |
1004 | ||
1c05b4bc | 1005 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1006 | { |
1c05b4bc N |
1007 | __le32 disk_csum; |
1008 | u32 csum; | |
1da177e4 LT |
1009 | unsigned long long newcsum; |
1010 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1011 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1012 | int i; |
1013 | ||
1014 | disk_csum = sb->sb_csum; | |
1015 | sb->sb_csum = 0; | |
1016 | newcsum = 0; | |
1017 | for (i=0; size>=4; size -= 4 ) | |
1018 | newcsum += le32_to_cpu(*isuper++); | |
1019 | ||
1020 | if (size == 2) | |
1c05b4bc | 1021 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1022 | |
1023 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1024 | sb->sb_csum = disk_csum; | |
1025 | return cpu_to_le32(csum); | |
1026 | } | |
1027 | ||
1028 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1029 | { | |
1030 | struct mdp_superblock_1 *sb; | |
1031 | int ret; | |
1032 | sector_t sb_offset; | |
1033 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 1034 | int bmask; |
1da177e4 LT |
1035 | |
1036 | /* | |
1037 | * Calculate the position of the superblock. | |
1038 | * It is always aligned to a 4K boundary and | |
1039 | * depeding on minor_version, it can be: | |
1040 | * 0: At least 8K, but less than 12K, from end of device | |
1041 | * 1: At start of device | |
1042 | * 2: 4K from start of device. | |
1043 | */ | |
1044 | switch(minor_version) { | |
1045 | case 0: | |
1046 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
1047 | sb_offset -= 8*2; | |
39730960 | 1048 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
1049 | /* convert from sectors to K */ |
1050 | sb_offset /= 2; | |
1051 | break; | |
1052 | case 1: | |
1053 | sb_offset = 0; | |
1054 | break; | |
1055 | case 2: | |
1056 | sb_offset = 4; | |
1057 | break; | |
1058 | default: | |
1059 | return -EINVAL; | |
1060 | } | |
1061 | rdev->sb_offset = sb_offset; | |
1062 | ||
0002b271 N |
1063 | /* superblock is rarely larger than 1K, but it can be larger, |
1064 | * and it is safe to read 4k, so we do that | |
1065 | */ | |
1066 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1067 | if (ret) return ret; |
1068 | ||
1069 | ||
1070 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1071 | ||
1072 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1073 | sb->major_version != cpu_to_le32(1) || | |
1074 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
1075 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 1076 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1077 | return -EINVAL; |
1078 | ||
1079 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1080 | printk("md: invalid superblock checksum on %s\n", | |
1081 | bdevname(rdev->bdev,b)); | |
1082 | return -EINVAL; | |
1083 | } | |
1084 | if (le64_to_cpu(sb->data_size) < 10) { | |
1085 | printk("md: data_size too small on %s\n", | |
1086 | bdevname(rdev->bdev,b)); | |
1087 | return -EINVAL; | |
1088 | } | |
e11e93fa N |
1089 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1090 | if (sb->level != cpu_to_le32(1) && | |
1091 | sb->level != cpu_to_le32(4) && | |
1092 | sb->level != cpu_to_le32(5) && | |
1093 | sb->level != cpu_to_le32(6) && | |
1094 | sb->level != cpu_to_le32(10)) { | |
1095 | printk(KERN_WARNING | |
1096 | "md: bitmaps not supported for this level.\n"); | |
1097 | return -EINVAL; | |
1098 | } | |
1099 | } | |
1100 | ||
1da177e4 LT |
1101 | rdev->preferred_minor = 0xffff; |
1102 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1103 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1104 | |
0002b271 | 1105 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1106 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
1107 | if (rdev->sb_size & bmask) |
1108 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
1109 | ||
31b65a0d N |
1110 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1111 | rdev->desc_nr = -1; | |
1112 | else | |
1113 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1114 | ||
1da177e4 | 1115 | if (refdev == 0) |
8ed75463 | 1116 | ret = 1; |
1da177e4 LT |
1117 | else { |
1118 | __u64 ev1, ev2; | |
1119 | struct mdp_superblock_1 *refsb = | |
1120 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1121 | ||
1122 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1123 | sb->level != refsb->level || | |
1124 | sb->layout != refsb->layout || | |
1125 | sb->chunksize != refsb->chunksize) { | |
1126 | printk(KERN_WARNING "md: %s has strangely different" | |
1127 | " superblock to %s\n", | |
1128 | bdevname(rdev->bdev,b), | |
1129 | bdevname(refdev->bdev,b2)); | |
1130 | return -EINVAL; | |
1131 | } | |
1132 | ev1 = le64_to_cpu(sb->events); | |
1133 | ev2 = le64_to_cpu(refsb->events); | |
1134 | ||
1135 | if (ev1 > ev2) | |
8ed75463 N |
1136 | ret = 1; |
1137 | else | |
1138 | ret = 0; | |
1da177e4 LT |
1139 | } |
1140 | if (minor_version) | |
1141 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1142 | else | |
1143 | rdev->size = rdev->sb_offset; | |
1144 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1145 | return -EINVAL; | |
1146 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1147 | if (le32_to_cpu(sb->chunksize)) | |
1148 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1149 | |
1c05b4bc | 1150 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1151 | return -EINVAL; |
8ed75463 | 1152 | return ret; |
1da177e4 LT |
1153 | } |
1154 | ||
1155 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1156 | { | |
1157 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1158 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1159 | |
41158c7e | 1160 | rdev->raid_disk = -1; |
c5d79adb N |
1161 | clear_bit(Faulty, &rdev->flags); |
1162 | clear_bit(In_sync, &rdev->flags); | |
1163 | clear_bit(WriteMostly, &rdev->flags); | |
1164 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1165 | ||
1da177e4 LT |
1166 | if (mddev->raid_disks == 0) { |
1167 | mddev->major_version = 1; | |
1168 | mddev->patch_version = 0; | |
e691063a | 1169 | mddev->external = 0; |
1da177e4 LT |
1170 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1171 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1172 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1173 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1174 | mddev->clevel[0] = 0; |
1da177e4 LT |
1175 | mddev->layout = le32_to_cpu(sb->layout); |
1176 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1177 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1178 | mddev->events = ev1; |
9223214e | 1179 | mddev->bitmap_offset = 0; |
29fc7e3e | 1180 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1181 | |
1182 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1183 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1184 | ||
1185 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1186 | |
71c0805c | 1187 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1188 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1189 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1190 | |
f6705578 N |
1191 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1192 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1193 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1194 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1195 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1196 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1197 | } else { | |
1198 | mddev->reshape_position = MaxSector; | |
1199 | mddev->delta_disks = 0; | |
1200 | mddev->new_level = mddev->level; | |
1201 | mddev->new_layout = mddev->layout; | |
1202 | mddev->new_chunk = mddev->chunk_size; | |
1203 | } | |
1204 | ||
41158c7e N |
1205 | } else if (mddev->pers == NULL) { |
1206 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1207 | ++ev1; |
1208 | if (ev1 < mddev->events) | |
1209 | return -EINVAL; | |
41158c7e N |
1210 | } else if (mddev->bitmap) { |
1211 | /* If adding to array with a bitmap, then we can accept an | |
1212 | * older device, but not too old. | |
1213 | */ | |
41158c7e N |
1214 | if (ev1 < mddev->bitmap->events_cleared) |
1215 | return 0; | |
07d84d10 N |
1216 | } else { |
1217 | if (ev1 < mddev->events) | |
1218 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1219 | return 0; | |
1220 | } | |
1da177e4 LT |
1221 | if (mddev->level != LEVEL_MULTIPATH) { |
1222 | int role; | |
1da177e4 LT |
1223 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1224 | switch(role) { | |
1225 | case 0xffff: /* spare */ | |
1da177e4 LT |
1226 | break; |
1227 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1228 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1229 | break; |
1230 | default: | |
5fd6c1dc N |
1231 | if ((le32_to_cpu(sb->feature_map) & |
1232 | MD_FEATURE_RECOVERY_OFFSET)) | |
1233 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1234 | else | |
1235 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1236 | rdev->raid_disk = role; |
1237 | break; | |
1238 | } | |
8ddf9efe N |
1239 | if (sb->devflags & WriteMostly1) |
1240 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1241 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1242 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1243 | |
1da177e4 LT |
1244 | return 0; |
1245 | } | |
1246 | ||
1247 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1248 | { | |
1249 | struct mdp_superblock_1 *sb; | |
1250 | struct list_head *tmp; | |
1251 | mdk_rdev_t *rdev2; | |
1252 | int max_dev, i; | |
1253 | /* make rdev->sb match mddev and rdev data. */ | |
1254 | ||
1255 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1256 | ||
1257 | sb->feature_map = 0; | |
1258 | sb->pad0 = 0; | |
5fd6c1dc | 1259 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1260 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1261 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1262 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1263 | ||
1264 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1265 | sb->events = cpu_to_le64(mddev->events); | |
1266 | if (mddev->in_sync) | |
1267 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1268 | else | |
1269 | sb->resync_offset = cpu_to_le64(0); | |
1270 | ||
1c05b4bc | 1271 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1272 | |
f0ca340c | 1273 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1274 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1275 | |
a654b9d8 N |
1276 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1277 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1278 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1279 | } |
5fd6c1dc N |
1280 | |
1281 | if (rdev->raid_disk >= 0 && | |
1282 | !test_bit(In_sync, &rdev->flags) && | |
1283 | rdev->recovery_offset > 0) { | |
1284 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1285 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1286 | } | |
1287 | ||
f6705578 N |
1288 | if (mddev->reshape_position != MaxSector) { |
1289 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1290 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1291 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1292 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1293 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1294 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1295 | } | |
a654b9d8 | 1296 | |
1da177e4 LT |
1297 | max_dev = 0; |
1298 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1299 | if (rdev2->desc_nr+1 > max_dev) | |
1300 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1301 | |
1302 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1303 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1304 | for (i=0; i<max_dev;i++) |
1305 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1306 | ||
1307 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1308 | i = rdev2->desc_nr; | |
b2d444d7 | 1309 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1310 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1311 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1312 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1313 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1314 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1315 | else |
1316 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1317 | } | |
1318 | ||
1da177e4 LT |
1319 | sb->sb_csum = calc_sb_1_csum(sb); |
1320 | } | |
1321 | ||
1322 | ||
75c96f85 | 1323 | static struct super_type super_types[] = { |
1da177e4 LT |
1324 | [0] = { |
1325 | .name = "0.90.0", | |
1326 | .owner = THIS_MODULE, | |
1327 | .load_super = super_90_load, | |
1328 | .validate_super = super_90_validate, | |
1329 | .sync_super = super_90_sync, | |
1330 | }, | |
1331 | [1] = { | |
1332 | .name = "md-1", | |
1333 | .owner = THIS_MODULE, | |
1334 | .load_super = super_1_load, | |
1335 | .validate_super = super_1_validate, | |
1336 | .sync_super = super_1_sync, | |
1337 | }, | |
1338 | }; | |
1da177e4 LT |
1339 | |
1340 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1341 | { | |
7dd5e7c3 N |
1342 | struct list_head *tmp, *tmp2; |
1343 | mdk_rdev_t *rdev, *rdev2; | |
1da177e4 LT |
1344 | |
1345 | ITERATE_RDEV(mddev1,rdev,tmp) | |
7dd5e7c3 N |
1346 | ITERATE_RDEV(mddev2, rdev2, tmp2) |
1347 | if (rdev->bdev->bd_contains == | |
1348 | rdev2->bdev->bd_contains) | |
1349 | return 1; | |
1da177e4 LT |
1350 | |
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | static LIST_HEAD(pending_raid_disks); | |
1355 | ||
1356 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1357 | { | |
7dd5e7c3 | 1358 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1359 | struct kobject *ko; |
1edf80d3 | 1360 | char *s; |
5e55e2f5 | 1361 | int err; |
1da177e4 LT |
1362 | |
1363 | if (rdev->mddev) { | |
1364 | MD_BUG(); | |
1365 | return -EINVAL; | |
1366 | } | |
2bf071bf N |
1367 | /* make sure rdev->size exceeds mddev->size */ |
1368 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1369 | if (mddev->pers) { |
1370 | /* Cannot change size, so fail | |
1371 | * If mddev->level <= 0, then we don't care | |
1372 | * about aligning sizes (e.g. linear) | |
1373 | */ | |
1374 | if (mddev->level > 0) | |
1375 | return -ENOSPC; | |
1376 | } else | |
2bf071bf N |
1377 | mddev->size = rdev->size; |
1378 | } | |
1da177e4 LT |
1379 | |
1380 | /* Verify rdev->desc_nr is unique. | |
1381 | * If it is -1, assign a free number, else | |
1382 | * check number is not in use | |
1383 | */ | |
1384 | if (rdev->desc_nr < 0) { | |
1385 | int choice = 0; | |
1386 | if (mddev->pers) choice = mddev->raid_disks; | |
1387 | while (find_rdev_nr(mddev, choice)) | |
1388 | choice++; | |
1389 | rdev->desc_nr = choice; | |
1390 | } else { | |
1391 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1392 | return -EBUSY; | |
1393 | } | |
19133a42 | 1394 | bdevname(rdev->bdev,b); |
649316b2 | 1395 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1396 | *s = '!'; |
649316b2 | 1397 | |
1da177e4 | 1398 | rdev->mddev = mddev; |
19133a42 | 1399 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1400 | |
b2d6db58 | 1401 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1402 | goto fail; |
86e6ffdd | 1403 | |
f637b9f9 | 1404 | if (rdev->bdev->bd_part) |
edfaa7c3 | 1405 | ko = &rdev->bdev->bd_part->dev.kobj; |
f637b9f9 | 1406 | else |
edfaa7c3 | 1407 | ko = &rdev->bdev->bd_disk->dev.kobj; |
5e55e2f5 N |
1408 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1409 | kobject_del(&rdev->kobj); | |
1410 | goto fail; | |
1411 | } | |
1412 | list_add(&rdev->same_set, &mddev->disks); | |
c5d79adb | 1413 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
1da177e4 | 1414 | return 0; |
5e55e2f5 N |
1415 | |
1416 | fail: | |
1417 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1418 | b, mdname(mddev)); | |
1419 | return err; | |
1da177e4 LT |
1420 | } |
1421 | ||
177a99b2 | 1422 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1423 | { |
1424 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1425 | kobject_del(&rdev->kobj); | |
177a99b2 | 1426 | kobject_put(&rdev->kobj); |
5792a285 N |
1427 | } |
1428 | ||
1da177e4 LT |
1429 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1430 | { | |
1431 | char b[BDEVNAME_SIZE]; | |
1432 | if (!rdev->mddev) { | |
1433 | MD_BUG(); | |
1434 | return; | |
1435 | } | |
5463c790 | 1436 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
1da177e4 LT |
1437 | list_del_init(&rdev->same_set); |
1438 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1439 | rdev->mddev = NULL; | |
86e6ffdd | 1440 | sysfs_remove_link(&rdev->kobj, "block"); |
5792a285 N |
1441 | |
1442 | /* We need to delay this, otherwise we can deadlock when | |
1443 | * writing to 'remove' to "dev/state" | |
1444 | */ | |
177a99b2 N |
1445 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1446 | kobject_get(&rdev->kobj); | |
5792a285 | 1447 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1448 | } |
1449 | ||
1450 | /* | |
1451 | * prevent the device from being mounted, repartitioned or | |
1452 | * otherwise reused by a RAID array (or any other kernel | |
1453 | * subsystem), by bd_claiming the device. | |
1454 | */ | |
c5d79adb | 1455 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1456 | { |
1457 | int err = 0; | |
1458 | struct block_device *bdev; | |
1459 | char b[BDEVNAME_SIZE]; | |
1460 | ||
2e7b651d | 1461 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1462 | if (IS_ERR(bdev)) { |
1463 | printk(KERN_ERR "md: could not open %s.\n", | |
1464 | __bdevname(dev, b)); | |
1465 | return PTR_ERR(bdev); | |
1466 | } | |
c5d79adb | 1467 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1468 | if (err) { |
1469 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1470 | bdevname(bdev, b)); | |
2e7b651d | 1471 | blkdev_put(bdev); |
1da177e4 LT |
1472 | return err; |
1473 | } | |
c5d79adb N |
1474 | if (!shared) |
1475 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1476 | rdev->bdev = bdev; |
1477 | return err; | |
1478 | } | |
1479 | ||
1480 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1481 | { | |
1482 | struct block_device *bdev = rdev->bdev; | |
1483 | rdev->bdev = NULL; | |
1484 | if (!bdev) | |
1485 | MD_BUG(); | |
1486 | bd_release(bdev); | |
2e7b651d | 1487 | blkdev_put(bdev); |
1da177e4 LT |
1488 | } |
1489 | ||
1490 | void md_autodetect_dev(dev_t dev); | |
1491 | ||
1492 | static void export_rdev(mdk_rdev_t * rdev) | |
1493 | { | |
1494 | char b[BDEVNAME_SIZE]; | |
1495 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1496 | bdevname(rdev->bdev,b)); | |
1497 | if (rdev->mddev) | |
1498 | MD_BUG(); | |
1499 | free_disk_sb(rdev); | |
1500 | list_del_init(&rdev->same_set); | |
1501 | #ifndef MODULE | |
1502 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1503 | #endif | |
1504 | unlock_rdev(rdev); | |
86e6ffdd | 1505 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1506 | } |
1507 | ||
1508 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1509 | { | |
1510 | unbind_rdev_from_array(rdev); | |
1511 | export_rdev(rdev); | |
1512 | } | |
1513 | ||
1514 | static void export_array(mddev_t *mddev) | |
1515 | { | |
1516 | struct list_head *tmp; | |
1517 | mdk_rdev_t *rdev; | |
1518 | ||
1519 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1520 | if (!rdev->mddev) { | |
1521 | MD_BUG(); | |
1522 | continue; | |
1523 | } | |
1524 | kick_rdev_from_array(rdev); | |
1525 | } | |
1526 | if (!list_empty(&mddev->disks)) | |
1527 | MD_BUG(); | |
1528 | mddev->raid_disks = 0; | |
1529 | mddev->major_version = 0; | |
1530 | } | |
1531 | ||
1532 | static void print_desc(mdp_disk_t *desc) | |
1533 | { | |
1534 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1535 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1536 | } | |
1537 | ||
1538 | static void print_sb(mdp_super_t *sb) | |
1539 | { | |
1540 | int i; | |
1541 | ||
1542 | printk(KERN_INFO | |
1543 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1544 | sb->major_version, sb->minor_version, sb->patch_version, | |
1545 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1546 | sb->ctime); | |
1547 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1548 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1549 | sb->md_minor, sb->layout, sb->chunk_size); | |
1550 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1551 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1552 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1553 | sb->failed_disks, sb->spare_disks, | |
1554 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1555 | ||
1556 | printk(KERN_INFO); | |
1557 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1558 | mdp_disk_t *desc; | |
1559 | ||
1560 | desc = sb->disks + i; | |
1561 | if (desc->number || desc->major || desc->minor || | |
1562 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1563 | printk(" D %2d: ", i); | |
1564 | print_desc(desc); | |
1565 | } | |
1566 | } | |
1567 | printk(KERN_INFO "md: THIS: "); | |
1568 | print_desc(&sb->this_disk); | |
1569 | ||
1570 | } | |
1571 | ||
1572 | static void print_rdev(mdk_rdev_t *rdev) | |
1573 | { | |
1574 | char b[BDEVNAME_SIZE]; | |
1575 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1576 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1577 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1578 | rdev->desc_nr); | |
1da177e4 LT |
1579 | if (rdev->sb_loaded) { |
1580 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1581 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1582 | } else | |
1583 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1584 | } | |
1585 | ||
5e56341d | 1586 | static void md_print_devices(void) |
1da177e4 LT |
1587 | { |
1588 | struct list_head *tmp, *tmp2; | |
1589 | mdk_rdev_t *rdev; | |
1590 | mddev_t *mddev; | |
1591 | char b[BDEVNAME_SIZE]; | |
1592 | ||
1593 | printk("\n"); | |
1594 | printk("md: **********************************\n"); | |
1595 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1596 | printk("md: **********************************\n"); | |
29ac4aa3 | 1597 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1598 | |
32a7627c N |
1599 | if (mddev->bitmap) |
1600 | bitmap_print_sb(mddev->bitmap); | |
1601 | else | |
1602 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1603 | ITERATE_RDEV(mddev,rdev,tmp2) |
1604 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1605 | printk("\n"); | |
1606 | ||
1607 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1608 | print_rdev(rdev); | |
1609 | } | |
1610 | printk("md: **********************************\n"); | |
1611 | printk("\n"); | |
1612 | } | |
1613 | ||
1614 | ||
42543769 | 1615 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1616 | { |
42543769 N |
1617 | /* Update each superblock (in-memory image), but |
1618 | * if we are allowed to, skip spares which already | |
1619 | * have the right event counter, or have one earlier | |
1620 | * (which would mean they aren't being marked as dirty | |
1621 | * with the rest of the array) | |
1622 | */ | |
1da177e4 LT |
1623 | mdk_rdev_t *rdev; |
1624 | struct list_head *tmp; | |
1625 | ||
1626 | ITERATE_RDEV(mddev,rdev,tmp) { | |
42543769 N |
1627 | if (rdev->sb_events == mddev->events || |
1628 | (nospares && | |
1629 | rdev->raid_disk < 0 && | |
1630 | (rdev->sb_events&1)==0 && | |
1631 | rdev->sb_events+1 == mddev->events)) { | |
1632 | /* Don't update this superblock */ | |
1633 | rdev->sb_loaded = 2; | |
1634 | } else { | |
1635 | super_types[mddev->major_version]. | |
1636 | sync_super(mddev, rdev); | |
1637 | rdev->sb_loaded = 1; | |
1638 | } | |
1da177e4 LT |
1639 | } |
1640 | } | |
1641 | ||
850b2b42 | 1642 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1643 | { |
1da177e4 LT |
1644 | struct list_head *tmp; |
1645 | mdk_rdev_t *rdev; | |
06d91a5f | 1646 | int sync_req; |
42543769 | 1647 | int nospares = 0; |
1da177e4 | 1648 | |
1da177e4 | 1649 | repeat: |
a9701a30 | 1650 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1651 | |
850b2b42 N |
1652 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1653 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1654 | force_change = 1; | |
1655 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1656 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1657 | * though if events isn't the right even/odd, we will have to do | |
1658 | * spares after all | |
1659 | */ | |
1660 | nospares = 1; | |
1661 | if (force_change) | |
1662 | nospares = 0; | |
1663 | if (mddev->degraded) | |
84692195 N |
1664 | /* If the array is degraded, then skipping spares is both |
1665 | * dangerous and fairly pointless. | |
1666 | * Dangerous because a device that was removed from the array | |
1667 | * might have a event_count that still looks up-to-date, | |
1668 | * so it can be re-added without a resync. | |
1669 | * Pointless because if there are any spares to skip, | |
1670 | * then a recovery will happen and soon that array won't | |
1671 | * be degraded any more and the spare can go back to sleep then. | |
1672 | */ | |
850b2b42 | 1673 | nospares = 0; |
84692195 | 1674 | |
06d91a5f | 1675 | sync_req = mddev->in_sync; |
1da177e4 | 1676 | mddev->utime = get_seconds(); |
42543769 N |
1677 | |
1678 | /* If this is just a dirty<->clean transition, and the array is clean | |
1679 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1680 | if (nospares |
42543769 | 1681 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1682 | && (mddev->events & 1) |
1683 | && mddev->events != 1) | |
42543769 N |
1684 | mddev->events--; |
1685 | else { | |
1686 | /* otherwise we have to go forward and ... */ | |
1687 | mddev->events ++; | |
1688 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1689 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1690 | if ((mddev->events&1)==0) { | |
1691 | mddev->events++; | |
1692 | nospares = 0; | |
1693 | } | |
1694 | } else { | |
1695 | /* otherwise insist on an even 'events' (for clean states) */ | |
1696 | if ((mddev->events&1)) { | |
1697 | mddev->events++; | |
1698 | nospares = 0; | |
1699 | } | |
1700 | } | |
1701 | } | |
1da177e4 LT |
1702 | |
1703 | if (!mddev->events) { | |
1704 | /* | |
1705 | * oops, this 64-bit counter should never wrap. | |
1706 | * Either we are in around ~1 trillion A.C., assuming | |
1707 | * 1 reboot per second, or we have a bug: | |
1708 | */ | |
1709 | MD_BUG(); | |
1710 | mddev->events --; | |
1711 | } | |
1da177e4 LT |
1712 | |
1713 | /* | |
1714 | * do not write anything to disk if using | |
1715 | * nonpersistent superblocks | |
1716 | */ | |
06d91a5f | 1717 | if (!mddev->persistent) { |
e691063a N |
1718 | if (!mddev->external) |
1719 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1720 | ||
a9701a30 | 1721 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1722 | wake_up(&mddev->sb_wait); |
1da177e4 | 1723 | return; |
06d91a5f | 1724 | } |
e691063a | 1725 | sync_sbs(mddev, nospares); |
a9701a30 | 1726 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1727 | |
1728 | dprintk(KERN_INFO | |
1729 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1730 | mdname(mddev),mddev->in_sync); | |
1731 | ||
4ad13663 | 1732 | bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1733 | ITERATE_RDEV(mddev,rdev,tmp) { |
1734 | char b[BDEVNAME_SIZE]; | |
1735 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1736 | if (rdev->sb_loaded != 1) |
1737 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1738 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1739 | dprintk("(skipping faulty "); |
1740 | ||
1741 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1742 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1743 | md_super_write(mddev,rdev, |
0002b271 | 1744 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1745 | rdev->sb_page); |
1746 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1747 | bdevname(rdev->bdev,b), | |
1748 | (unsigned long long)rdev->sb_offset); | |
42543769 | 1749 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1750 | |
1da177e4 LT |
1751 | } else |
1752 | dprintk(")\n"); | |
7bfa19f2 | 1753 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1754 | /* only need to write one superblock... */ |
1755 | break; | |
1756 | } | |
a9701a30 | 1757 | md_super_wait(mddev); |
850b2b42 | 1758 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1759 | |
a9701a30 | 1760 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1761 | if (mddev->in_sync != sync_req || |
1762 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1763 | /* have to write it out again */ |
a9701a30 | 1764 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1765 | goto repeat; |
1766 | } | |
850b2b42 | 1767 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1768 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1769 | wake_up(&mddev->sb_wait); |
06d91a5f | 1770 | |
1da177e4 LT |
1771 | } |
1772 | ||
bce74dac N |
1773 | /* words written to sysfs files may, or my not, be \n terminated. |
1774 | * We want to accept with case. For this we use cmd_match. | |
1775 | */ | |
1776 | static int cmd_match(const char *cmd, const char *str) | |
1777 | { | |
1778 | /* See if cmd, written into a sysfs file, matches | |
1779 | * str. They must either be the same, or cmd can | |
1780 | * have a trailing newline | |
1781 | */ | |
1782 | while (*cmd && *str && *cmd == *str) { | |
1783 | cmd++; | |
1784 | str++; | |
1785 | } | |
1786 | if (*cmd == '\n') | |
1787 | cmd++; | |
1788 | if (*str || *cmd) | |
1789 | return 0; | |
1790 | return 1; | |
1791 | } | |
1792 | ||
86e6ffdd N |
1793 | struct rdev_sysfs_entry { |
1794 | struct attribute attr; | |
1795 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1796 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1797 | }; | |
1798 | ||
1799 | static ssize_t | |
96de1e66 | 1800 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1801 | { |
1802 | char *sep = ""; | |
20a49ff6 | 1803 | size_t len = 0; |
86e6ffdd | 1804 | |
b2d444d7 | 1805 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1806 | len+= sprintf(page+len, "%sfaulty",sep); |
1807 | sep = ","; | |
1808 | } | |
b2d444d7 | 1809 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1810 | len += sprintf(page+len, "%sin_sync",sep); |
1811 | sep = ","; | |
1812 | } | |
f655675b N |
1813 | if (test_bit(WriteMostly, &rdev->flags)) { |
1814 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1815 | sep = ","; | |
1816 | } | |
b2d444d7 N |
1817 | if (!test_bit(Faulty, &rdev->flags) && |
1818 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1819 | len += sprintf(page+len, "%sspare", sep); |
1820 | sep = ","; | |
1821 | } | |
1822 | return len+sprintf(page+len, "\n"); | |
1823 | } | |
1824 | ||
45dc2de1 N |
1825 | static ssize_t |
1826 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1827 | { | |
1828 | /* can write | |
1829 | * faulty - simulates and error | |
1830 | * remove - disconnects the device | |
f655675b N |
1831 | * writemostly - sets write_mostly |
1832 | * -writemostly - clears write_mostly | |
45dc2de1 N |
1833 | */ |
1834 | int err = -EINVAL; | |
1835 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1836 | md_error(rdev->mddev, rdev); | |
1837 | err = 0; | |
1838 | } else if (cmd_match(buf, "remove")) { | |
1839 | if (rdev->raid_disk >= 0) | |
1840 | err = -EBUSY; | |
1841 | else { | |
1842 | mddev_t *mddev = rdev->mddev; | |
1843 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1844 | if (mddev->pers) |
1845 | md_update_sb(mddev, 1); | |
45dc2de1 N |
1846 | md_new_event(mddev); |
1847 | err = 0; | |
1848 | } | |
f655675b N |
1849 | } else if (cmd_match(buf, "writemostly")) { |
1850 | set_bit(WriteMostly, &rdev->flags); | |
1851 | err = 0; | |
1852 | } else if (cmd_match(buf, "-writemostly")) { | |
1853 | clear_bit(WriteMostly, &rdev->flags); | |
1854 | err = 0; | |
45dc2de1 N |
1855 | } |
1856 | return err ? err : len; | |
1857 | } | |
80ca3a44 N |
1858 | static struct rdev_sysfs_entry rdev_state = |
1859 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd N |
1860 | |
1861 | static ssize_t | |
96de1e66 | 1862 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1863 | { |
1864 | if (rdev->sb_loaded && rdev->sb_size) { | |
1865 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1866 | return rdev->sb_size; | |
1867 | } else | |
1868 | return 0; | |
1869 | } | |
96de1e66 N |
1870 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1871 | ||
4dbcdc75 N |
1872 | static ssize_t |
1873 | errors_show(mdk_rdev_t *rdev, char *page) | |
1874 | { | |
1875 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1876 | } | |
1877 | ||
1878 | static ssize_t | |
1879 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1880 | { | |
1881 | char *e; | |
1882 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1883 | if (*buf && (*e == 0 || *e == '\n')) { | |
1884 | atomic_set(&rdev->corrected_errors, n); | |
1885 | return len; | |
1886 | } | |
1887 | return -EINVAL; | |
1888 | } | |
1889 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 1890 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 1891 | |
014236d2 N |
1892 | static ssize_t |
1893 | slot_show(mdk_rdev_t *rdev, char *page) | |
1894 | { | |
1895 | if (rdev->raid_disk < 0) | |
1896 | return sprintf(page, "none\n"); | |
1897 | else | |
1898 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1899 | } | |
1900 | ||
1901 | static ssize_t | |
1902 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1903 | { | |
1904 | char *e; | |
c303da6d N |
1905 | int err; |
1906 | char nm[20]; | |
014236d2 N |
1907 | int slot = simple_strtoul(buf, &e, 10); |
1908 | if (strncmp(buf, "none", 4)==0) | |
1909 | slot = -1; | |
1910 | else if (e==buf || (*e && *e!= '\n')) | |
1911 | return -EINVAL; | |
c303da6d N |
1912 | if (rdev->mddev->pers) { |
1913 | /* Setting 'slot' on an active array requires also | |
1914 | * updating the 'rd%d' link, and communicating | |
1915 | * with the personality with ->hot_*_disk. | |
1916 | * For now we only support removing | |
1917 | * failed/spare devices. This normally happens automatically, | |
1918 | * but not when the metadata is externally managed. | |
1919 | */ | |
1920 | if (slot != -1) | |
1921 | return -EBUSY; | |
1922 | if (rdev->raid_disk == -1) | |
1923 | return -EEXIST; | |
1924 | /* personality does all needed checks */ | |
1925 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
1926 | return -EINVAL; | |
1927 | err = rdev->mddev->pers-> | |
1928 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
1929 | if (err) | |
1930 | return err; | |
1931 | sprintf(nm, "rd%d", rdev->raid_disk); | |
1932 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
1933 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
1934 | md_wakeup_thread(rdev->mddev->thread); | |
1935 | } else { | |
1936 | if (slot >= rdev->mddev->raid_disks) | |
1937 | return -ENOSPC; | |
1938 | rdev->raid_disk = slot; | |
1939 | /* assume it is working */ | |
c5d79adb N |
1940 | clear_bit(Faulty, &rdev->flags); |
1941 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d N |
1942 | set_bit(In_sync, &rdev->flags); |
1943 | } | |
014236d2 N |
1944 | return len; |
1945 | } | |
1946 | ||
1947 | ||
1948 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 1949 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 1950 | |
93c8cad0 N |
1951 | static ssize_t |
1952 | offset_show(mdk_rdev_t *rdev, char *page) | |
1953 | { | |
6961ece4 | 1954 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
1955 | } |
1956 | ||
1957 | static ssize_t | |
1958 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1959 | { | |
1960 | char *e; | |
1961 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
1962 | if (e==buf || (*e && *e != '\n')) | |
1963 | return -EINVAL; | |
1964 | if (rdev->mddev->pers) | |
1965 | return -EBUSY; | |
c5d79adb N |
1966 | if (rdev->size && rdev->mddev->external) |
1967 | /* Must set offset before size, so overlap checks | |
1968 | * can be sane */ | |
1969 | return -EBUSY; | |
93c8cad0 N |
1970 | rdev->data_offset = offset; |
1971 | return len; | |
1972 | } | |
1973 | ||
1974 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 1975 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 1976 | |
83303b61 N |
1977 | static ssize_t |
1978 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
1979 | { | |
1980 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
1981 | } | |
1982 | ||
c5d79adb N |
1983 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
1984 | { | |
1985 | /* check if two start/length pairs overlap */ | |
1986 | if (s1+l1 <= s2) | |
1987 | return 0; | |
1988 | if (s2+l2 <= s1) | |
1989 | return 0; | |
1990 | return 1; | |
1991 | } | |
1992 | ||
83303b61 N |
1993 | static ssize_t |
1994 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1995 | { | |
1996 | char *e; | |
1997 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
c5d79adb | 1998 | unsigned long long oldsize = rdev->size; |
83303b61 N |
1999 | if (e==buf || (*e && *e != '\n')) |
2000 | return -EINVAL; | |
2001 | if (rdev->mddev->pers) | |
2002 | return -EBUSY; | |
2003 | rdev->size = size; | |
c5d79adb N |
2004 | if (size > oldsize && rdev->mddev->external) { |
2005 | /* need to check that all other rdevs with the same ->bdev | |
2006 | * do not overlap. We need to unlock the mddev to avoid | |
2007 | * a deadlock. We have already changed rdev->size, and if | |
2008 | * we have to change it back, we will have the lock again. | |
2009 | */ | |
2010 | mddev_t *mddev; | |
2011 | int overlap = 0; | |
2012 | struct list_head *tmp, *tmp2; | |
2013 | ||
2014 | mddev_unlock(rdev->mddev); | |
29ac4aa3 | 2015 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2016 | mdk_rdev_t *rdev2; |
2017 | ||
2018 | mddev_lock(mddev); | |
2019 | ITERATE_RDEV(mddev, rdev2, tmp2) | |
2020 | if (test_bit(AllReserved, &rdev2->flags) || | |
2021 | (rdev->bdev == rdev2->bdev && | |
2022 | rdev != rdev2 && | |
2023 | overlaps(rdev->data_offset, rdev->size, | |
2024 | rdev2->data_offset, rdev2->size))) { | |
2025 | overlap = 1; | |
2026 | break; | |
2027 | } | |
2028 | mddev_unlock(mddev); | |
2029 | if (overlap) { | |
2030 | mddev_put(mddev); | |
2031 | break; | |
2032 | } | |
2033 | } | |
2034 | mddev_lock(rdev->mddev); | |
2035 | if (overlap) { | |
2036 | /* Someone else could have slipped in a size | |
2037 | * change here, but doing so is just silly. | |
2038 | * We put oldsize back because we *know* it is | |
2039 | * safe, and trust userspace not to race with | |
2040 | * itself | |
2041 | */ | |
2042 | rdev->size = oldsize; | |
2043 | return -EBUSY; | |
2044 | } | |
2045 | } | |
83303b61 N |
2046 | if (size < rdev->mddev->size || rdev->mddev->size == 0) |
2047 | rdev->mddev->size = size; | |
2048 | return len; | |
2049 | } | |
2050 | ||
2051 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2052 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2053 | |
86e6ffdd N |
2054 | static struct attribute *rdev_default_attrs[] = { |
2055 | &rdev_state.attr, | |
2056 | &rdev_super.attr, | |
4dbcdc75 | 2057 | &rdev_errors.attr, |
014236d2 | 2058 | &rdev_slot.attr, |
93c8cad0 | 2059 | &rdev_offset.attr, |
83303b61 | 2060 | &rdev_size.attr, |
86e6ffdd N |
2061 | NULL, |
2062 | }; | |
2063 | static ssize_t | |
2064 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2065 | { | |
2066 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2067 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
2068 | ||
2069 | if (!entry->show) | |
2070 | return -EIO; | |
2071 | return entry->show(rdev, page); | |
2072 | } | |
2073 | ||
2074 | static ssize_t | |
2075 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2076 | const char *page, size_t length) | |
2077 | { | |
2078 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2079 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
ca388059 | 2080 | int rv; |
86e6ffdd N |
2081 | |
2082 | if (!entry->store) | |
2083 | return -EIO; | |
67463acb N |
2084 | if (!capable(CAP_SYS_ADMIN)) |
2085 | return -EACCES; | |
ca388059 N |
2086 | rv = mddev_lock(rdev->mddev); |
2087 | if (!rv) { | |
2088 | rv = entry->store(rdev, page, length); | |
2089 | mddev_unlock(rdev->mddev); | |
2090 | } | |
2091 | return rv; | |
86e6ffdd N |
2092 | } |
2093 | ||
2094 | static void rdev_free(struct kobject *ko) | |
2095 | { | |
2096 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2097 | kfree(rdev); | |
2098 | } | |
2099 | static struct sysfs_ops rdev_sysfs_ops = { | |
2100 | .show = rdev_attr_show, | |
2101 | .store = rdev_attr_store, | |
2102 | }; | |
2103 | static struct kobj_type rdev_ktype = { | |
2104 | .release = rdev_free, | |
2105 | .sysfs_ops = &rdev_sysfs_ops, | |
2106 | .default_attrs = rdev_default_attrs, | |
2107 | }; | |
2108 | ||
1da177e4 LT |
2109 | /* |
2110 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2111 | * | |
2112 | * mark the device faulty if: | |
2113 | * | |
2114 | * - the device is nonexistent (zero size) | |
2115 | * - the device has no valid superblock | |
2116 | * | |
2117 | * a faulty rdev _never_ has rdev->sb set. | |
2118 | */ | |
2119 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2120 | { | |
2121 | char b[BDEVNAME_SIZE]; | |
2122 | int err; | |
2123 | mdk_rdev_t *rdev; | |
2124 | sector_t size; | |
2125 | ||
9ffae0cf | 2126 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2127 | if (!rdev) { |
2128 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2129 | return ERR_PTR(-ENOMEM); | |
2130 | } | |
1da177e4 LT |
2131 | |
2132 | if ((err = alloc_disk_sb(rdev))) | |
2133 | goto abort_free; | |
2134 | ||
c5d79adb | 2135 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2136 | if (err) |
2137 | goto abort_free; | |
2138 | ||
f9cb074b | 2139 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2140 | |
1da177e4 | 2141 | rdev->desc_nr = -1; |
2b6e8459 | 2142 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2143 | rdev->raid_disk = -1; |
b2d444d7 | 2144 | rdev->flags = 0; |
1da177e4 | 2145 | rdev->data_offset = 0; |
42543769 | 2146 | rdev->sb_events = 0; |
1da177e4 | 2147 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2148 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2149 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2150 | |
2151 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2152 | if (!size) { | |
2153 | printk(KERN_WARNING | |
2154 | "md: %s has zero or unknown size, marking faulty!\n", | |
2155 | bdevname(rdev->bdev,b)); | |
2156 | err = -EINVAL; | |
2157 | goto abort_free; | |
2158 | } | |
2159 | ||
2160 | if (super_format >= 0) { | |
2161 | err = super_types[super_format]. | |
2162 | load_super(rdev, NULL, super_minor); | |
2163 | if (err == -EINVAL) { | |
df968c4e N |
2164 | printk(KERN_WARNING |
2165 | "md: %s does not have a valid v%d.%d " | |
2166 | "superblock, not importing!\n", | |
2167 | bdevname(rdev->bdev,b), | |
2168 | super_format, super_minor); | |
1da177e4 LT |
2169 | goto abort_free; |
2170 | } | |
2171 | if (err < 0) { | |
2172 | printk(KERN_WARNING | |
2173 | "md: could not read %s's sb, not importing!\n", | |
2174 | bdevname(rdev->bdev,b)); | |
2175 | goto abort_free; | |
2176 | } | |
2177 | } | |
2178 | INIT_LIST_HEAD(&rdev->same_set); | |
2179 | ||
2180 | return rdev; | |
2181 | ||
2182 | abort_free: | |
2183 | if (rdev->sb_page) { | |
2184 | if (rdev->bdev) | |
2185 | unlock_rdev(rdev); | |
2186 | free_disk_sb(rdev); | |
2187 | } | |
2188 | kfree(rdev); | |
2189 | return ERR_PTR(err); | |
2190 | } | |
2191 | ||
2192 | /* | |
2193 | * Check a full RAID array for plausibility | |
2194 | */ | |
2195 | ||
2196 | ||
a757e64c | 2197 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2198 | { |
2199 | int i; | |
2200 | struct list_head *tmp; | |
2201 | mdk_rdev_t *rdev, *freshest; | |
2202 | char b[BDEVNAME_SIZE]; | |
2203 | ||
2204 | freshest = NULL; | |
2205 | ITERATE_RDEV(mddev,rdev,tmp) | |
2206 | switch (super_types[mddev->major_version]. | |
2207 | load_super(rdev, freshest, mddev->minor_version)) { | |
2208 | case 1: | |
2209 | freshest = rdev; | |
2210 | break; | |
2211 | case 0: | |
2212 | break; | |
2213 | default: | |
2214 | printk( KERN_ERR \ | |
2215 | "md: fatal superblock inconsistency in %s" | |
2216 | " -- removing from array\n", | |
2217 | bdevname(rdev->bdev,b)); | |
2218 | kick_rdev_from_array(rdev); | |
2219 | } | |
2220 | ||
2221 | ||
2222 | super_types[mddev->major_version]. | |
2223 | validate_super(mddev, freshest); | |
2224 | ||
2225 | i = 0; | |
2226 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2227 | if (rdev != freshest) | |
2228 | if (super_types[mddev->major_version]. | |
2229 | validate_super(mddev, rdev)) { | |
2230 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2231 | " from array!\n", | |
2232 | bdevname(rdev->bdev,b)); | |
2233 | kick_rdev_from_array(rdev); | |
2234 | continue; | |
2235 | } | |
2236 | if (mddev->level == LEVEL_MULTIPATH) { | |
2237 | rdev->desc_nr = i++; | |
2238 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2239 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2240 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2241 | rdev->raid_disk = -1; | |
2242 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2243 | } |
2244 | } | |
2245 | ||
2246 | ||
2247 | ||
2248 | if (mddev->recovery_cp != MaxSector && | |
2249 | mddev->level >= 1) | |
2250 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2251 | " -- starting background reconstruction\n", | |
2252 | mdname(mddev)); | |
2253 | ||
1da177e4 LT |
2254 | } |
2255 | ||
16f17b39 N |
2256 | static ssize_t |
2257 | safe_delay_show(mddev_t *mddev, char *page) | |
2258 | { | |
2259 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2260 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2261 | } | |
2262 | static ssize_t | |
2263 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2264 | { | |
2265 | int scale=1; | |
2266 | int dot=0; | |
2267 | int i; | |
2268 | unsigned long msec; | |
2269 | char buf[30]; | |
2270 | char *e; | |
2271 | /* remove a period, and count digits after it */ | |
2272 | if (len >= sizeof(buf)) | |
2273 | return -EINVAL; | |
2274 | strlcpy(buf, cbuf, len); | |
2275 | buf[len] = 0; | |
2276 | for (i=0; i<len; i++) { | |
2277 | if (dot) { | |
2278 | if (isdigit(buf[i])) { | |
2279 | buf[i-1] = buf[i]; | |
2280 | scale *= 10; | |
2281 | } | |
2282 | buf[i] = 0; | |
2283 | } else if (buf[i] == '.') { | |
2284 | dot=1; | |
2285 | buf[i] = 0; | |
2286 | } | |
2287 | } | |
2288 | msec = simple_strtoul(buf, &e, 10); | |
2289 | if (e == buf || (*e && *e != '\n')) | |
2290 | return -EINVAL; | |
2291 | msec = (msec * 1000) / scale; | |
2292 | if (msec == 0) | |
2293 | mddev->safemode_delay = 0; | |
2294 | else { | |
2295 | mddev->safemode_delay = (msec*HZ)/1000; | |
2296 | if (mddev->safemode_delay == 0) | |
2297 | mddev->safemode_delay = 1; | |
2298 | } | |
2299 | return len; | |
2300 | } | |
2301 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2302 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2303 | |
eae1701f | 2304 | static ssize_t |
96de1e66 | 2305 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2306 | { |
2604b703 | 2307 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2308 | if (p) |
eae1701f | 2309 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2310 | else if (mddev->clevel[0]) |
2311 | return sprintf(page, "%s\n", mddev->clevel); | |
2312 | else if (mddev->level != LEVEL_NONE) | |
2313 | return sprintf(page, "%d\n", mddev->level); | |
2314 | else | |
2315 | return 0; | |
eae1701f N |
2316 | } |
2317 | ||
d9d166c2 N |
2318 | static ssize_t |
2319 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2320 | { | |
20a49ff6 | 2321 | ssize_t rv = len; |
d9d166c2 N |
2322 | if (mddev->pers) |
2323 | return -EBUSY; | |
2324 | if (len == 0) | |
2325 | return 0; | |
2326 | if (len >= sizeof(mddev->clevel)) | |
2327 | return -ENOSPC; | |
2328 | strncpy(mddev->clevel, buf, len); | |
2329 | if (mddev->clevel[len-1] == '\n') | |
2330 | len--; | |
2331 | mddev->clevel[len] = 0; | |
2332 | mddev->level = LEVEL_NONE; | |
2333 | return rv; | |
2334 | } | |
2335 | ||
2336 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2337 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2338 | |
d4dbd025 N |
2339 | |
2340 | static ssize_t | |
2341 | layout_show(mddev_t *mddev, char *page) | |
2342 | { | |
2343 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2344 | if (mddev->reshape_position != MaxSector && |
2345 | mddev->layout != mddev->new_layout) | |
2346 | return sprintf(page, "%d (%d)\n", | |
2347 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2348 | return sprintf(page, "%d\n", mddev->layout); |
2349 | } | |
2350 | ||
2351 | static ssize_t | |
2352 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2353 | { | |
2354 | char *e; | |
2355 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2356 | |
2357 | if (!*buf || (*e && *e != '\n')) | |
2358 | return -EINVAL; | |
2359 | ||
08a02ecd N |
2360 | if (mddev->pers) |
2361 | return -EBUSY; | |
2362 | if (mddev->reshape_position != MaxSector) | |
2363 | mddev->new_layout = n; | |
2364 | else | |
2365 | mddev->layout = n; | |
d4dbd025 N |
2366 | return len; |
2367 | } | |
2368 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2369 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2370 | |
2371 | ||
eae1701f | 2372 | static ssize_t |
96de1e66 | 2373 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2374 | { |
bb636547 N |
2375 | if (mddev->raid_disks == 0) |
2376 | return 0; | |
08a02ecd N |
2377 | if (mddev->reshape_position != MaxSector && |
2378 | mddev->delta_disks != 0) | |
2379 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2380 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2381 | return sprintf(page, "%d\n", mddev->raid_disks); |
2382 | } | |
2383 | ||
da943b99 N |
2384 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2385 | ||
2386 | static ssize_t | |
2387 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2388 | { | |
da943b99 N |
2389 | char *e; |
2390 | int rv = 0; | |
2391 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2392 | ||
2393 | if (!*buf || (*e && *e != '\n')) | |
2394 | return -EINVAL; | |
2395 | ||
2396 | if (mddev->pers) | |
2397 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2398 | else if (mddev->reshape_position != MaxSector) { |
2399 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2400 | mddev->delta_disks = n - olddisks; | |
2401 | mddev->raid_disks = n; | |
2402 | } else | |
da943b99 N |
2403 | mddev->raid_disks = n; |
2404 | return rv ? rv : len; | |
2405 | } | |
2406 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2407 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2408 | |
3b34380a N |
2409 | static ssize_t |
2410 | chunk_size_show(mddev_t *mddev, char *page) | |
2411 | { | |
08a02ecd N |
2412 | if (mddev->reshape_position != MaxSector && |
2413 | mddev->chunk_size != mddev->new_chunk) | |
2414 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2415 | mddev->chunk_size); | |
3b34380a N |
2416 | return sprintf(page, "%d\n", mddev->chunk_size); |
2417 | } | |
2418 | ||
2419 | static ssize_t | |
2420 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2421 | { | |
2422 | /* can only set chunk_size if array is not yet active */ | |
2423 | char *e; | |
2424 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2425 | ||
3b34380a N |
2426 | if (!*buf || (*e && *e != '\n')) |
2427 | return -EINVAL; | |
2428 | ||
08a02ecd N |
2429 | if (mddev->pers) |
2430 | return -EBUSY; | |
2431 | else if (mddev->reshape_position != MaxSector) | |
2432 | mddev->new_chunk = n; | |
2433 | else | |
2434 | mddev->chunk_size = n; | |
3b34380a N |
2435 | return len; |
2436 | } | |
2437 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2438 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2439 | |
a94213b1 N |
2440 | static ssize_t |
2441 | resync_start_show(mddev_t *mddev, char *page) | |
2442 | { | |
2443 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2444 | } | |
2445 | ||
2446 | static ssize_t | |
2447 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2448 | { | |
2449 | /* can only set chunk_size if array is not yet active */ | |
2450 | char *e; | |
2451 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2452 | ||
2453 | if (mddev->pers) | |
2454 | return -EBUSY; | |
2455 | if (!*buf || (*e && *e != '\n')) | |
2456 | return -EINVAL; | |
2457 | ||
2458 | mddev->recovery_cp = n; | |
2459 | return len; | |
2460 | } | |
2461 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2462 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2463 | |
9e653b63 N |
2464 | /* |
2465 | * The array state can be: | |
2466 | * | |
2467 | * clear | |
2468 | * No devices, no size, no level | |
2469 | * Equivalent to STOP_ARRAY ioctl | |
2470 | * inactive | |
2471 | * May have some settings, but array is not active | |
2472 | * all IO results in error | |
2473 | * When written, doesn't tear down array, but just stops it | |
2474 | * suspended (not supported yet) | |
2475 | * All IO requests will block. The array can be reconfigured. | |
2476 | * Writing this, if accepted, will block until array is quiessent | |
2477 | * readonly | |
2478 | * no resync can happen. no superblocks get written. | |
2479 | * write requests fail | |
2480 | * read-auto | |
2481 | * like readonly, but behaves like 'clean' on a write request. | |
2482 | * | |
2483 | * clean - no pending writes, but otherwise active. | |
2484 | * When written to inactive array, starts without resync | |
2485 | * If a write request arrives then | |
2486 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2487 | * if not known, block and switch to write-pending | |
2488 | * If written to an active array that has pending writes, then fails. | |
2489 | * active | |
2490 | * fully active: IO and resync can be happening. | |
2491 | * When written to inactive array, starts with resync | |
2492 | * | |
2493 | * write-pending | |
2494 | * clean, but writes are blocked waiting for 'active' to be written. | |
2495 | * | |
2496 | * active-idle | |
2497 | * like active, but no writes have been seen for a while (100msec). | |
2498 | * | |
2499 | */ | |
2500 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2501 | write_pending, active_idle, bad_word}; | |
05381954 | 2502 | static char *array_states[] = { |
9e653b63 N |
2503 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2504 | "write-pending", "active-idle", NULL }; | |
2505 | ||
2506 | static int match_word(const char *word, char **list) | |
2507 | { | |
2508 | int n; | |
2509 | for (n=0; list[n]; n++) | |
2510 | if (cmd_match(word, list[n])) | |
2511 | break; | |
2512 | return n; | |
2513 | } | |
2514 | ||
2515 | static ssize_t | |
2516 | array_state_show(mddev_t *mddev, char *page) | |
2517 | { | |
2518 | enum array_state st = inactive; | |
2519 | ||
2520 | if (mddev->pers) | |
2521 | switch(mddev->ro) { | |
2522 | case 1: | |
2523 | st = readonly; | |
2524 | break; | |
2525 | case 2: | |
2526 | st = read_auto; | |
2527 | break; | |
2528 | case 0: | |
2529 | if (mddev->in_sync) | |
2530 | st = clean; | |
e691063a N |
2531 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2532 | st = write_pending; | |
9e653b63 N |
2533 | else if (mddev->safemode) |
2534 | st = active_idle; | |
2535 | else | |
2536 | st = active; | |
2537 | } | |
2538 | else { | |
2539 | if (list_empty(&mddev->disks) && | |
2540 | mddev->raid_disks == 0 && | |
2541 | mddev->size == 0) | |
2542 | st = clear; | |
2543 | else | |
2544 | st = inactive; | |
2545 | } | |
2546 | return sprintf(page, "%s\n", array_states[st]); | |
2547 | } | |
2548 | ||
2549 | static int do_md_stop(mddev_t * mddev, int ro); | |
2550 | static int do_md_run(mddev_t * mddev); | |
2551 | static int restart_array(mddev_t *mddev); | |
2552 | ||
2553 | static ssize_t | |
2554 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2555 | { | |
2556 | int err = -EINVAL; | |
2557 | enum array_state st = match_word(buf, array_states); | |
2558 | switch(st) { | |
2559 | case bad_word: | |
2560 | break; | |
2561 | case clear: | |
2562 | /* stopping an active array */ | |
e691063a N |
2563 | if (atomic_read(&mddev->active) > 1) |
2564 | return -EBUSY; | |
2565 | err = do_md_stop(mddev, 0); | |
9e653b63 N |
2566 | break; |
2567 | case inactive: | |
2568 | /* stopping an active array */ | |
2569 | if (mddev->pers) { | |
2570 | if (atomic_read(&mddev->active) > 1) | |
2571 | return -EBUSY; | |
2572 | err = do_md_stop(mddev, 2); | |
e691063a N |
2573 | } else |
2574 | err = 0; /* already inactive */ | |
9e653b63 N |
2575 | break; |
2576 | case suspended: | |
2577 | break; /* not supported yet */ | |
2578 | case readonly: | |
2579 | if (mddev->pers) | |
2580 | err = do_md_stop(mddev, 1); | |
2581 | else { | |
2582 | mddev->ro = 1; | |
2583 | err = do_md_run(mddev); | |
2584 | } | |
2585 | break; | |
2586 | case read_auto: | |
2587 | /* stopping an active array */ | |
2588 | if (mddev->pers) { | |
2589 | err = do_md_stop(mddev, 1); | |
2590 | if (err == 0) | |
2591 | mddev->ro = 2; /* FIXME mark devices writable */ | |
2592 | } else { | |
2593 | mddev->ro = 2; | |
2594 | err = do_md_run(mddev); | |
2595 | } | |
2596 | break; | |
2597 | case clean: | |
2598 | if (mddev->pers) { | |
2599 | restart_array(mddev); | |
2600 | spin_lock_irq(&mddev->write_lock); | |
2601 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2602 | if (mddev->in_sync == 0) { |
2603 | mddev->in_sync = 1; | |
2604 | if (mddev->persistent) | |
2605 | set_bit(MD_CHANGE_CLEAN, | |
2606 | &mddev->flags); | |
2607 | } | |
2608 | err = 0; | |
2609 | } else | |
2610 | err = -EBUSY; | |
9e653b63 N |
2611 | spin_unlock_irq(&mddev->write_lock); |
2612 | } else { | |
2613 | mddev->ro = 0; | |
2614 | mddev->recovery_cp = MaxSector; | |
2615 | err = do_md_run(mddev); | |
2616 | } | |
2617 | break; | |
2618 | case active: | |
2619 | if (mddev->pers) { | |
2620 | restart_array(mddev); | |
e691063a N |
2621 | if (mddev->external) |
2622 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2623 | wake_up(&mddev->sb_wait); |
2624 | err = 0; | |
2625 | } else { | |
2626 | mddev->ro = 0; | |
2627 | err = do_md_run(mddev); | |
2628 | } | |
2629 | break; | |
2630 | case write_pending: | |
2631 | case active_idle: | |
2632 | /* these cannot be set */ | |
2633 | break; | |
2634 | } | |
2635 | if (err) | |
2636 | return err; | |
2637 | else | |
2638 | return len; | |
2639 | } | |
80ca3a44 N |
2640 | static struct md_sysfs_entry md_array_state = |
2641 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2642 | |
6d7ff738 N |
2643 | static ssize_t |
2644 | null_show(mddev_t *mddev, char *page) | |
2645 | { | |
2646 | return -EINVAL; | |
2647 | } | |
2648 | ||
2649 | static ssize_t | |
2650 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2651 | { | |
2652 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2653 | /* The new device is added to the array. | |
2654 | * If the array has a persistent superblock, we read the | |
2655 | * superblock to initialise info and check validity. | |
2656 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2657 | * which mainly checks size. | |
2658 | */ | |
2659 | char *e; | |
2660 | int major = simple_strtoul(buf, &e, 10); | |
2661 | int minor; | |
2662 | dev_t dev; | |
2663 | mdk_rdev_t *rdev; | |
2664 | int err; | |
2665 | ||
2666 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2667 | return -EINVAL; | |
2668 | minor = simple_strtoul(e+1, &e, 10); | |
2669 | if (*e && *e != '\n') | |
2670 | return -EINVAL; | |
2671 | dev = MKDEV(major, minor); | |
2672 | if (major != MAJOR(dev) || | |
2673 | minor != MINOR(dev)) | |
2674 | return -EOVERFLOW; | |
2675 | ||
2676 | ||
2677 | if (mddev->persistent) { | |
2678 | rdev = md_import_device(dev, mddev->major_version, | |
2679 | mddev->minor_version); | |
2680 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2681 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2682 | mdk_rdev_t, same_set); | |
2683 | err = super_types[mddev->major_version] | |
2684 | .load_super(rdev, rdev0, mddev->minor_version); | |
2685 | if (err < 0) | |
2686 | goto out; | |
2687 | } | |
c5d79adb N |
2688 | } else if (mddev->external) |
2689 | rdev = md_import_device(dev, -2, -1); | |
2690 | else | |
6d7ff738 N |
2691 | rdev = md_import_device(dev, -1, -1); |
2692 | ||
2693 | if (IS_ERR(rdev)) | |
2694 | return PTR_ERR(rdev); | |
2695 | err = bind_rdev_to_array(rdev, mddev); | |
2696 | out: | |
2697 | if (err) | |
2698 | export_rdev(rdev); | |
2699 | return err ? err : len; | |
2700 | } | |
2701 | ||
2702 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2703 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2704 | |
9b1d1dac PC |
2705 | static ssize_t |
2706 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2707 | { | |
2708 | char *end; | |
2709 | unsigned long chunk, end_chunk; | |
2710 | ||
2711 | if (!mddev->bitmap) | |
2712 | goto out; | |
2713 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2714 | while (*buf) { | |
2715 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2716 | if (buf == end) break; | |
2717 | if (*end == '-') { /* range */ | |
2718 | buf = end + 1; | |
2719 | end_chunk = simple_strtoul(buf, &end, 0); | |
2720 | if (buf == end) break; | |
2721 | } | |
2722 | if (*end && !isspace(*end)) break; | |
2723 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2724 | buf = end; | |
2725 | while (isspace(*buf)) buf++; | |
2726 | } | |
2727 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2728 | out: | |
2729 | return len; | |
2730 | } | |
2731 | ||
2732 | static struct md_sysfs_entry md_bitmap = | |
2733 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2734 | ||
a35b0d69 N |
2735 | static ssize_t |
2736 | size_show(mddev_t *mddev, char *page) | |
2737 | { | |
2738 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2739 | } | |
2740 | ||
2741 | static int update_size(mddev_t *mddev, unsigned long size); | |
2742 | ||
2743 | static ssize_t | |
2744 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2745 | { | |
2746 | /* If array is inactive, we can reduce the component size, but | |
2747 | * not increase it (except from 0). | |
2748 | * If array is active, we can try an on-line resize | |
2749 | */ | |
2750 | char *e; | |
2751 | int err = 0; | |
2752 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2753 | if (!*buf || *buf == '\n' || | |
2754 | (*e && *e != '\n')) | |
2755 | return -EINVAL; | |
2756 | ||
2757 | if (mddev->pers) { | |
2758 | err = update_size(mddev, size); | |
850b2b42 | 2759 | md_update_sb(mddev, 1); |
a35b0d69 N |
2760 | } else { |
2761 | if (mddev->size == 0 || | |
2762 | mddev->size > size) | |
2763 | mddev->size = size; | |
2764 | else | |
2765 | err = -ENOSPC; | |
2766 | } | |
2767 | return err ? err : len; | |
2768 | } | |
2769 | ||
2770 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 2771 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 2772 | |
8bb93aac N |
2773 | |
2774 | /* Metdata version. | |
e691063a N |
2775 | * This is one of |
2776 | * 'none' for arrays with no metadata (good luck...) | |
2777 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
2778 | * or N.M for internally known formats |
2779 | */ | |
2780 | static ssize_t | |
2781 | metadata_show(mddev_t *mddev, char *page) | |
2782 | { | |
2783 | if (mddev->persistent) | |
2784 | return sprintf(page, "%d.%d\n", | |
2785 | mddev->major_version, mddev->minor_version); | |
e691063a N |
2786 | else if (mddev->external) |
2787 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
2788 | else |
2789 | return sprintf(page, "none\n"); | |
2790 | } | |
2791 | ||
2792 | static ssize_t | |
2793 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2794 | { | |
2795 | int major, minor; | |
2796 | char *e; | |
2797 | if (!list_empty(&mddev->disks)) | |
2798 | return -EBUSY; | |
2799 | ||
2800 | if (cmd_match(buf, "none")) { | |
2801 | mddev->persistent = 0; | |
e691063a N |
2802 | mddev->external = 0; |
2803 | mddev->major_version = 0; | |
2804 | mddev->minor_version = 90; | |
2805 | return len; | |
2806 | } | |
2807 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 2808 | size_t namelen = len-9; |
e691063a N |
2809 | if (namelen >= sizeof(mddev->metadata_type)) |
2810 | namelen = sizeof(mddev->metadata_type)-1; | |
2811 | strncpy(mddev->metadata_type, buf+9, namelen); | |
2812 | mddev->metadata_type[namelen] = 0; | |
2813 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
2814 | mddev->metadata_type[--namelen] = 0; | |
2815 | mddev->persistent = 0; | |
2816 | mddev->external = 1; | |
8bb93aac N |
2817 | mddev->major_version = 0; |
2818 | mddev->minor_version = 90; | |
2819 | return len; | |
2820 | } | |
2821 | major = simple_strtoul(buf, &e, 10); | |
2822 | if (e==buf || *e != '.') | |
2823 | return -EINVAL; | |
2824 | buf = e+1; | |
2825 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 2826 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 2827 | return -EINVAL; |
50511da3 | 2828 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
2829 | return -ENOENT; |
2830 | mddev->major_version = major; | |
2831 | mddev->minor_version = minor; | |
2832 | mddev->persistent = 1; | |
e691063a | 2833 | mddev->external = 0; |
8bb93aac N |
2834 | return len; |
2835 | } | |
2836 | ||
2837 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 2838 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 2839 | |
24dd469d | 2840 | static ssize_t |
7eec314d | 2841 | action_show(mddev_t *mddev, char *page) |
24dd469d | 2842 | { |
7eec314d | 2843 | char *type = "idle"; |
31399d9e | 2844 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 2845 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
2846 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
2847 | type = "reshape"; | |
2848 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2849 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2850 | type = "resync"; | |
2851 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2852 | type = "check"; | |
2853 | else | |
2854 | type = "repair"; | |
2855 | } else | |
2856 | type = "recover"; | |
2857 | } | |
2858 | return sprintf(page, "%s\n", type); | |
2859 | } | |
2860 | ||
2861 | static ssize_t | |
7eec314d | 2862 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 2863 | { |
7eec314d N |
2864 | if (!mddev->pers || !mddev->pers->sync_request) |
2865 | return -EINVAL; | |
2866 | ||
bce74dac | 2867 | if (cmd_match(page, "idle")) { |
7eec314d N |
2868 | if (mddev->sync_thread) { |
2869 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2870 | md_unregister_thread(mddev->sync_thread); | |
2871 | mddev->sync_thread = NULL; | |
2872 | mddev->recovery = 0; | |
2873 | } | |
03c902e1 N |
2874 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2875 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 2876 | return -EBUSY; |
03c902e1 | 2877 | else if (cmd_match(page, "resync") || cmd_match(page, "recover")) |
7eec314d | 2878 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
16484bf5 N |
2879 | else if (cmd_match(page, "reshape")) { |
2880 | int err; | |
2881 | if (mddev->pers->start_reshape == NULL) | |
2882 | return -EINVAL; | |
2883 | err = mddev->pers->start_reshape(mddev); | |
2884 | if (err) | |
2885 | return err; | |
2886 | } else { | |
bce74dac | 2887 | if (cmd_match(page, "check")) |
7eec314d | 2888 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 2889 | else if (!cmd_match(page, "repair")) |
7eec314d N |
2890 | return -EINVAL; |
2891 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
2892 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 2893 | } |
03c902e1 | 2894 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d N |
2895 | md_wakeup_thread(mddev->thread); |
2896 | return len; | |
2897 | } | |
2898 | ||
9d88883e | 2899 | static ssize_t |
96de1e66 | 2900 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
2901 | { |
2902 | return sprintf(page, "%llu\n", | |
2903 | (unsigned long long) mddev->resync_mismatches); | |
2904 | } | |
2905 | ||
80ca3a44 N |
2906 | static struct md_sysfs_entry md_scan_mode = |
2907 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 2908 | |
96de1e66 | 2909 | |
80ca3a44 | 2910 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 2911 | |
88202a0c N |
2912 | static ssize_t |
2913 | sync_min_show(mddev_t *mddev, char *page) | |
2914 | { | |
2915 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
2916 | mddev->sync_speed_min ? "local": "system"); | |
2917 | } | |
2918 | ||
2919 | static ssize_t | |
2920 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
2921 | { | |
2922 | int min; | |
2923 | char *e; | |
2924 | if (strncmp(buf, "system", 6)==0) { | |
2925 | mddev->sync_speed_min = 0; | |
2926 | return len; | |
2927 | } | |
2928 | min = simple_strtoul(buf, &e, 10); | |
2929 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
2930 | return -EINVAL; | |
2931 | mddev->sync_speed_min = min; | |
2932 | return len; | |
2933 | } | |
2934 | ||
2935 | static struct md_sysfs_entry md_sync_min = | |
2936 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
2937 | ||
2938 | static ssize_t | |
2939 | sync_max_show(mddev_t *mddev, char *page) | |
2940 | { | |
2941 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
2942 | mddev->sync_speed_max ? "local": "system"); | |
2943 | } | |
2944 | ||
2945 | static ssize_t | |
2946 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
2947 | { | |
2948 | int max; | |
2949 | char *e; | |
2950 | if (strncmp(buf, "system", 6)==0) { | |
2951 | mddev->sync_speed_max = 0; | |
2952 | return len; | |
2953 | } | |
2954 | max = simple_strtoul(buf, &e, 10); | |
2955 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
2956 | return -EINVAL; | |
2957 | mddev->sync_speed_max = max; | |
2958 | return len; | |
2959 | } | |
2960 | ||
2961 | static struct md_sysfs_entry md_sync_max = | |
2962 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
2963 | ||
d7f3d291 IP |
2964 | static ssize_t |
2965 | degraded_show(mddev_t *mddev, char *page) | |
2966 | { | |
2967 | return sprintf(page, "%d\n", mddev->degraded); | |
2968 | } | |
2969 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c N |
2970 | |
2971 | static ssize_t | |
2972 | sync_speed_show(mddev_t *mddev, char *page) | |
2973 | { | |
2974 | unsigned long resync, dt, db; | |
ff4e8d9a | 2975 | resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)); |
88202a0c N |
2976 | dt = ((jiffies - mddev->resync_mark) / HZ); |
2977 | if (!dt) dt++; | |
2978 | db = resync - (mddev->resync_mark_cnt); | |
2979 | return sprintf(page, "%ld\n", db/dt/2); /* K/sec */ | |
2980 | } | |
2981 | ||
80ca3a44 | 2982 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
2983 | |
2984 | static ssize_t | |
2985 | sync_completed_show(mddev_t *mddev, char *page) | |
2986 | { | |
2987 | unsigned long max_blocks, resync; | |
2988 | ||
2989 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
2990 | max_blocks = mddev->resync_max_sectors; | |
2991 | else | |
2992 | max_blocks = mddev->size << 1; | |
2993 | ||
2994 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
2995 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
2996 | } | |
2997 | ||
80ca3a44 | 2998 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 2999 | |
c6207277 N |
3000 | static ssize_t |
3001 | max_sync_show(mddev_t *mddev, char *page) | |
3002 | { | |
3003 | if (mddev->resync_max == MaxSector) | |
3004 | return sprintf(page, "max\n"); | |
3005 | else | |
3006 | return sprintf(page, "%llu\n", | |
3007 | (unsigned long long)mddev->resync_max); | |
3008 | } | |
3009 | static ssize_t | |
3010 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3011 | { | |
3012 | if (strncmp(buf, "max", 3) == 0) | |
3013 | mddev->resync_max = MaxSector; | |
3014 | else { | |
3015 | char *ep; | |
3016 | unsigned long long max = simple_strtoull(buf, &ep, 10); | |
3017 | if (ep == buf || (*ep != 0 && *ep != '\n')) | |
3018 | return -EINVAL; | |
3019 | if (max < mddev->resync_max && | |
3020 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3021 | return -EBUSY; | |
3022 | ||
3023 | /* Must be a multiple of chunk_size */ | |
3024 | if (mddev->chunk_size) { | |
3025 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3026 | return -EINVAL; | |
3027 | } | |
3028 | mddev->resync_max = max; | |
3029 | } | |
3030 | wake_up(&mddev->recovery_wait); | |
3031 | return len; | |
3032 | } | |
3033 | ||
3034 | static struct md_sysfs_entry md_max_sync = | |
3035 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3036 | ||
e464eafd N |
3037 | static ssize_t |
3038 | suspend_lo_show(mddev_t *mddev, char *page) | |
3039 | { | |
3040 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3041 | } | |
3042 | ||
3043 | static ssize_t | |
3044 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3045 | { | |
3046 | char *e; | |
3047 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3048 | ||
3049 | if (mddev->pers->quiesce == NULL) | |
3050 | return -EINVAL; | |
3051 | if (buf == e || (*e && *e != '\n')) | |
3052 | return -EINVAL; | |
3053 | if (new >= mddev->suspend_hi || | |
3054 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3055 | mddev->suspend_lo = new; | |
3056 | mddev->pers->quiesce(mddev, 2); | |
3057 | return len; | |
3058 | } else | |
3059 | return -EINVAL; | |
3060 | } | |
3061 | static struct md_sysfs_entry md_suspend_lo = | |
3062 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3063 | ||
3064 | ||
3065 | static ssize_t | |
3066 | suspend_hi_show(mddev_t *mddev, char *page) | |
3067 | { | |
3068 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3069 | } | |
3070 | ||
3071 | static ssize_t | |
3072 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3073 | { | |
3074 | char *e; | |
3075 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3076 | ||
3077 | if (mddev->pers->quiesce == NULL) | |
3078 | return -EINVAL; | |
3079 | if (buf == e || (*e && *e != '\n')) | |
3080 | return -EINVAL; | |
3081 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3082 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3083 | mddev->suspend_hi = new; | |
3084 | mddev->pers->quiesce(mddev, 1); | |
3085 | mddev->pers->quiesce(mddev, 0); | |
3086 | return len; | |
3087 | } else | |
3088 | return -EINVAL; | |
3089 | } | |
3090 | static struct md_sysfs_entry md_suspend_hi = | |
3091 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3092 | ||
08a02ecd N |
3093 | static ssize_t |
3094 | reshape_position_show(mddev_t *mddev, char *page) | |
3095 | { | |
3096 | if (mddev->reshape_position != MaxSector) | |
3097 | return sprintf(page, "%llu\n", | |
3098 | (unsigned long long)mddev->reshape_position); | |
3099 | strcpy(page, "none\n"); | |
3100 | return 5; | |
3101 | } | |
3102 | ||
3103 | static ssize_t | |
3104 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3105 | { | |
3106 | char *e; | |
3107 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3108 | if (mddev->pers) | |
3109 | return -EBUSY; | |
3110 | if (buf == e || (*e && *e != '\n')) | |
3111 | return -EINVAL; | |
3112 | mddev->reshape_position = new; | |
3113 | mddev->delta_disks = 0; | |
3114 | mddev->new_level = mddev->level; | |
3115 | mddev->new_layout = mddev->layout; | |
3116 | mddev->new_chunk = mddev->chunk_size; | |
3117 | return len; | |
3118 | } | |
3119 | ||
3120 | static struct md_sysfs_entry md_reshape_position = | |
3121 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3122 | reshape_position_store); | |
3123 | ||
e464eafd | 3124 | |
eae1701f N |
3125 | static struct attribute *md_default_attrs[] = { |
3126 | &md_level.attr, | |
d4dbd025 | 3127 | &md_layout.attr, |
eae1701f | 3128 | &md_raid_disks.attr, |
3b34380a | 3129 | &md_chunk_size.attr, |
a35b0d69 | 3130 | &md_size.attr, |
a94213b1 | 3131 | &md_resync_start.attr, |
8bb93aac | 3132 | &md_metadata.attr, |
6d7ff738 | 3133 | &md_new_device.attr, |
16f17b39 | 3134 | &md_safe_delay.attr, |
9e653b63 | 3135 | &md_array_state.attr, |
08a02ecd | 3136 | &md_reshape_position.attr, |
411036fa N |
3137 | NULL, |
3138 | }; | |
3139 | ||
3140 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3141 | &md_scan_mode.attr, |
9d88883e | 3142 | &md_mismatches.attr, |
88202a0c N |
3143 | &md_sync_min.attr, |
3144 | &md_sync_max.attr, | |
3145 | &md_sync_speed.attr, | |
3146 | &md_sync_completed.attr, | |
c6207277 | 3147 | &md_max_sync.attr, |
e464eafd N |
3148 | &md_suspend_lo.attr, |
3149 | &md_suspend_hi.attr, | |
9b1d1dac | 3150 | &md_bitmap.attr, |
d7f3d291 | 3151 | &md_degraded.attr, |
eae1701f N |
3152 | NULL, |
3153 | }; | |
411036fa N |
3154 | static struct attribute_group md_redundancy_group = { |
3155 | .name = NULL, | |
3156 | .attrs = md_redundancy_attrs, | |
3157 | }; | |
3158 | ||
eae1701f N |
3159 | |
3160 | static ssize_t | |
3161 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3162 | { | |
3163 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3164 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3165 | ssize_t rv; |
eae1701f N |
3166 | |
3167 | if (!entry->show) | |
3168 | return -EIO; | |
5dc5cf7d IM |
3169 | rv = mddev_lock(mddev); |
3170 | if (!rv) { | |
3171 | rv = entry->show(mddev, page); | |
3172 | mddev_unlock(mddev); | |
3173 | } | |
96de1e66 | 3174 | return rv; |
eae1701f N |
3175 | } |
3176 | ||
3177 | static ssize_t | |
3178 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3179 | const char *page, size_t length) | |
3180 | { | |
3181 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3182 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3183 | ssize_t rv; |
eae1701f N |
3184 | |
3185 | if (!entry->store) | |
3186 | return -EIO; | |
67463acb N |
3187 | if (!capable(CAP_SYS_ADMIN)) |
3188 | return -EACCES; | |
5dc5cf7d IM |
3189 | rv = mddev_lock(mddev); |
3190 | if (!rv) { | |
3191 | rv = entry->store(mddev, page, length); | |
3192 | mddev_unlock(mddev); | |
3193 | } | |
96de1e66 | 3194 | return rv; |
eae1701f N |
3195 | } |
3196 | ||
3197 | static void md_free(struct kobject *ko) | |
3198 | { | |
3199 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
3200 | kfree(mddev); | |
3201 | } | |
3202 | ||
3203 | static struct sysfs_ops md_sysfs_ops = { | |
3204 | .show = md_attr_show, | |
3205 | .store = md_attr_store, | |
3206 | }; | |
3207 | static struct kobj_type md_ktype = { | |
3208 | .release = md_free, | |
3209 | .sysfs_ops = &md_sysfs_ops, | |
3210 | .default_attrs = md_default_attrs, | |
3211 | }; | |
3212 | ||
1da177e4 LT |
3213 | int mdp_major = 0; |
3214 | ||
3215 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3216 | { | |
48c9c27b | 3217 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3218 | mddev_t *mddev = mddev_find(dev); |
3219 | struct gendisk *disk; | |
3220 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
3221 | int shift = partitioned ? MdpMinorShift : 0; | |
3222 | int unit = MINOR(dev) >> shift; | |
3830c62f | 3223 | int error; |
1da177e4 LT |
3224 | |
3225 | if (!mddev) | |
3226 | return NULL; | |
3227 | ||
48c9c27b | 3228 | mutex_lock(&disks_mutex); |
1da177e4 | 3229 | if (mddev->gendisk) { |
48c9c27b | 3230 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3231 | mddev_put(mddev); |
3232 | return NULL; | |
3233 | } | |
3234 | disk = alloc_disk(1 << shift); | |
3235 | if (!disk) { | |
48c9c27b | 3236 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3237 | mddev_put(mddev); |
3238 | return NULL; | |
3239 | } | |
3240 | disk->major = MAJOR(dev); | |
3241 | disk->first_minor = unit << shift; | |
ce7b0f46 | 3242 | if (partitioned) |
1da177e4 | 3243 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3244 | else |
1da177e4 | 3245 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3246 | disk->fops = &md_fops; |
3247 | disk->private_data = mddev; | |
3248 | disk->queue = mddev->queue; | |
3249 | add_disk(disk); | |
3250 | mddev->gendisk = disk; | |
48c9c27b | 3251 | mutex_unlock(&disks_mutex); |
edfaa7c3 | 3252 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj, |
3830c62f GKH |
3253 | "%s", "md"); |
3254 | if (error) | |
5e55e2f5 N |
3255 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3256 | disk->disk_name); | |
3830c62f GKH |
3257 | else |
3258 | kobject_uevent(&mddev->kobj, KOBJ_ADD); | |
1da177e4 LT |
3259 | return NULL; |
3260 | } | |
3261 | ||
1da177e4 LT |
3262 | static void md_safemode_timeout(unsigned long data) |
3263 | { | |
3264 | mddev_t *mddev = (mddev_t *) data; | |
3265 | ||
3266 | mddev->safemode = 1; | |
3267 | md_wakeup_thread(mddev->thread); | |
3268 | } | |
3269 | ||
6ff8d8ec | 3270 | static int start_dirty_degraded; |
1da177e4 LT |
3271 | |
3272 | static int do_md_run(mddev_t * mddev) | |
3273 | { | |
2604b703 | 3274 | int err; |
1da177e4 LT |
3275 | int chunk_size; |
3276 | struct list_head *tmp; | |
3277 | mdk_rdev_t *rdev; | |
3278 | struct gendisk *disk; | |
2604b703 | 3279 | struct mdk_personality *pers; |
1da177e4 LT |
3280 | char b[BDEVNAME_SIZE]; |
3281 | ||
a757e64c N |
3282 | if (list_empty(&mddev->disks)) |
3283 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3284 | return -EINVAL; |
1da177e4 LT |
3285 | |
3286 | if (mddev->pers) | |
3287 | return -EBUSY; | |
3288 | ||
3289 | /* | |
3290 | * Analyze all RAID superblock(s) | |
3291 | */ | |
1ec4a939 N |
3292 | if (!mddev->raid_disks) { |
3293 | if (!mddev->persistent) | |
3294 | return -EINVAL; | |
a757e64c | 3295 | analyze_sbs(mddev); |
1ec4a939 | 3296 | } |
1da177e4 LT |
3297 | |
3298 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3299 | |
3300 | if (chunk_size) { | |
1da177e4 LT |
3301 | if (chunk_size > MAX_CHUNK_SIZE) { |
3302 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3303 | chunk_size, MAX_CHUNK_SIZE); | |
3304 | return -EINVAL; | |
3305 | } | |
3306 | /* | |
3307 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
3308 | */ | |
3309 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3310 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3311 | return -EINVAL; |
3312 | } | |
3313 | if (chunk_size < PAGE_SIZE) { | |
3314 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
3315 | chunk_size, PAGE_SIZE); | |
3316 | return -EINVAL; | |
3317 | } | |
3318 | ||
3319 | /* devices must have minimum size of one chunk */ | |
3320 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 3321 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3322 | continue; |
3323 | if (rdev->size < chunk_size / 1024) { | |
3324 | printk(KERN_WARNING | |
3325 | "md: Dev %s smaller than chunk_size:" | |
3326 | " %lluk < %dk\n", | |
3327 | bdevname(rdev->bdev,b), | |
3328 | (unsigned long long)rdev->size, | |
3329 | chunk_size / 1024); | |
3330 | return -EINVAL; | |
3331 | } | |
3332 | } | |
3333 | } | |
3334 | ||
1da177e4 | 3335 | #ifdef CONFIG_KMOD |
d9d166c2 N |
3336 | if (mddev->level != LEVEL_NONE) |
3337 | request_module("md-level-%d", mddev->level); | |
3338 | else if (mddev->clevel[0]) | |
3339 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3340 | #endif |
3341 | ||
3342 | /* | |
3343 | * Drop all container device buffers, from now on | |
3344 | * the only valid external interface is through the md | |
3345 | * device. | |
1da177e4 LT |
3346 | */ |
3347 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 3348 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3349 | continue; |
3350 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3351 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3352 | |
3353 | /* perform some consistency tests on the device. | |
3354 | * We don't want the data to overlap the metadata, | |
3355 | * Internal Bitmap issues has handled elsewhere. | |
3356 | */ | |
3357 | if (rdev->data_offset < rdev->sb_offset) { | |
3358 | if (mddev->size && | |
3359 | rdev->data_offset + mddev->size*2 | |
3360 | > rdev->sb_offset*2) { | |
3361 | printk("md: %s: data overlaps metadata\n", | |
3362 | mdname(mddev)); | |
3363 | return -EINVAL; | |
3364 | } | |
3365 | } else { | |
3366 | if (rdev->sb_offset*2 + rdev->sb_size/512 | |
3367 | > rdev->data_offset) { | |
3368 | printk("md: %s: metadata overlaps data\n", | |
3369 | mdname(mddev)); | |
3370 | return -EINVAL; | |
3371 | } | |
3372 | } | |
1da177e4 LT |
3373 | } |
3374 | ||
3375 | md_probe(mddev->unit, NULL, NULL); | |
3376 | disk = mddev->gendisk; | |
3377 | if (!disk) | |
3378 | return -ENOMEM; | |
3379 | ||
3380 | spin_lock(&pers_lock); | |
d9d166c2 | 3381 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3382 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3383 | spin_unlock(&pers_lock); |
d9d166c2 N |
3384 | if (mddev->level != LEVEL_NONE) |
3385 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3386 | mddev->level); | |
3387 | else | |
3388 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3389 | mddev->clevel); | |
1da177e4 LT |
3390 | return -EINVAL; |
3391 | } | |
2604b703 | 3392 | mddev->pers = pers; |
1da177e4 | 3393 | spin_unlock(&pers_lock); |
d9d166c2 N |
3394 | mddev->level = pers->level; |
3395 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3396 | |
f6705578 | 3397 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3398 | pers->start_reshape == NULL) { |
f6705578 N |
3399 | /* This personality cannot handle reshaping... */ |
3400 | mddev->pers = NULL; | |
3401 | module_put(pers->owner); | |
3402 | return -EINVAL; | |
3403 | } | |
3404 | ||
7dd5e7c3 N |
3405 | if (pers->sync_request) { |
3406 | /* Warn if this is a potentially silly | |
3407 | * configuration. | |
3408 | */ | |
3409 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3410 | mdk_rdev_t *rdev2; | |
3411 | struct list_head *tmp2; | |
3412 | int warned = 0; | |
3413 | ITERATE_RDEV(mddev, rdev, tmp) { | |
3414 | ITERATE_RDEV(mddev, rdev2, tmp2) { | |
3415 | if (rdev < rdev2 && | |
3416 | rdev->bdev->bd_contains == | |
3417 | rdev2->bdev->bd_contains) { | |
3418 | printk(KERN_WARNING | |
3419 | "%s: WARNING: %s appears to be" | |
3420 | " on the same physical disk as" | |
3421 | " %s.\n", | |
3422 | mdname(mddev), | |
3423 | bdevname(rdev->bdev,b), | |
3424 | bdevname(rdev2->bdev,b2)); | |
3425 | warned = 1; | |
3426 | } | |
3427 | } | |
3428 | } | |
3429 | if (warned) | |
3430 | printk(KERN_WARNING | |
3431 | "True protection against single-disk" | |
3432 | " failure might be compromised.\n"); | |
3433 | } | |
3434 | ||
657390d2 | 3435 | mddev->recovery = 0; |
1da177e4 | 3436 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3437 | mddev->barriers_work = 1; |
6ff8d8ec | 3438 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3439 | |
f91de92e N |
3440 | if (start_readonly) |
3441 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3442 | ||
b15c2e57 N |
3443 | err = mddev->pers->run(mddev); |
3444 | if (!err && mddev->pers->sync_request) { | |
3445 | err = bitmap_create(mddev); | |
3446 | if (err) { | |
3447 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3448 | mdname(mddev), err); | |
3449 | mddev->pers->stop(mddev); | |
3450 | } | |
3451 | } | |
1da177e4 LT |
3452 | if (err) { |
3453 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3454 | module_put(mddev->pers->owner); | |
3455 | mddev->pers = NULL; | |
32a7627c N |
3456 | bitmap_destroy(mddev); |
3457 | return err; | |
1da177e4 | 3458 | } |
5e55e2f5 N |
3459 | if (mddev->pers->sync_request) { |
3460 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3461 | printk(KERN_WARNING | |
3462 | "md: cannot register extra attributes for %s\n", | |
3463 | mdname(mddev)); | |
3464 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ | |
fd9d49ca N |
3465 | mddev->ro = 0; |
3466 | ||
1da177e4 LT |
3467 | atomic_set(&mddev->writes_pending,0); |
3468 | mddev->safemode = 0; | |
3469 | mddev->safemode_timer.function = md_safemode_timeout; | |
3470 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3471 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3472 | mddev->in_sync = 1; |
86e6ffdd N |
3473 | |
3474 | ITERATE_RDEV(mddev,rdev,tmp) | |
3475 | if (rdev->raid_disk >= 0) { | |
3476 | char nm[20]; | |
3477 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3478 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3479 | printk("md: cannot register %s for %s\n", | |
3480 | nm, mdname(mddev)); | |
86e6ffdd | 3481 | } |
1da177e4 LT |
3482 | |
3483 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3484 | ||
850b2b42 N |
3485 | if (mddev->flags) |
3486 | md_update_sb(mddev, 0); | |
1da177e4 LT |
3487 | |
3488 | set_capacity(disk, mddev->array_size<<1); | |
3489 | ||
3490 | /* If we call blk_queue_make_request here, it will | |
3491 | * re-initialise max_sectors etc which may have been | |
3492 | * refined inside -> run. So just set the bits we need to set. | |
3493 | * Most initialisation happended when we called | |
3494 | * blk_queue_make_request(..., md_fail_request) | |
3495 | * earlier. | |
3496 | */ | |
3497 | mddev->queue->queuedata = mddev; | |
3498 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3499 | ||
5fd6c1dc N |
3500 | /* If there is a partially-recovered drive we need to |
3501 | * start recovery here. If we leave it to md_check_recovery, | |
3502 | * it will remove the drives and not do the right thing | |
3503 | */ | |
0b8c9de0 | 3504 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc N |
3505 | struct list_head *rtmp; |
3506 | int spares = 0; | |
3507 | ITERATE_RDEV(mddev,rdev,rtmp) | |
3508 | if (rdev->raid_disk >= 0 && | |
3509 | !test_bit(In_sync, &rdev->flags) && | |
3510 | !test_bit(Faulty, &rdev->flags)) | |
3511 | /* complete an interrupted recovery */ | |
3512 | spares++; | |
3513 | if (spares && mddev->pers->sync_request) { | |
3514 | mddev->recovery = 0; | |
3515 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3516 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3517 | mddev, | |
3518 | "%s_resync"); | |
3519 | if (!mddev->sync_thread) { | |
3520 | printk(KERN_ERR "%s: could not start resync" | |
3521 | " thread...\n", | |
3522 | mdname(mddev)); | |
3523 | /* leave the spares where they are, it shouldn't hurt */ | |
3524 | mddev->recovery = 0; | |
0b8c9de0 | 3525 | } |
5fd6c1dc N |
3526 | } |
3527 | } | |
0b8c9de0 N |
3528 | md_wakeup_thread(mddev->thread); |
3529 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3530 | |
44ce6294 | 3531 | mddev->changed = 1; |
d7603b7e | 3532 | md_new_event(mddev); |
edfaa7c3 | 3533 | kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE); |
1da177e4 LT |
3534 | return 0; |
3535 | } | |
3536 | ||
3537 | static int restart_array(mddev_t *mddev) | |
3538 | { | |
3539 | struct gendisk *disk = mddev->gendisk; | |
3540 | int err; | |
3541 | ||
3542 | /* | |
3543 | * Complain if it has no devices | |
3544 | */ | |
3545 | err = -ENXIO; | |
3546 | if (list_empty(&mddev->disks)) | |
3547 | goto out; | |
3548 | ||
3549 | if (mddev->pers) { | |
3550 | err = -EBUSY; | |
3551 | if (!mddev->ro) | |
3552 | goto out; | |
3553 | ||
3554 | mddev->safemode = 0; | |
3555 | mddev->ro = 0; | |
3556 | set_disk_ro(disk, 0); | |
3557 | ||
3558 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3559 | mdname(mddev)); | |
3560 | /* | |
3561 | * Kick recovery or resync if necessary | |
3562 | */ | |
3563 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3564 | md_wakeup_thread(mddev->thread); | |
5fd6c1dc | 3565 | md_wakeup_thread(mddev->sync_thread); |
1da177e4 | 3566 | err = 0; |
9e653b63 | 3567 | } else |
1da177e4 | 3568 | err = -EINVAL; |
1da177e4 LT |
3569 | |
3570 | out: | |
3571 | return err; | |
3572 | } | |
3573 | ||
acc55e22 N |
3574 | /* similar to deny_write_access, but accounts for our holding a reference |
3575 | * to the file ourselves */ | |
3576 | static int deny_bitmap_write_access(struct file * file) | |
3577 | { | |
3578 | struct inode *inode = file->f_mapping->host; | |
3579 | ||
3580 | spin_lock(&inode->i_lock); | |
3581 | if (atomic_read(&inode->i_writecount) > 1) { | |
3582 | spin_unlock(&inode->i_lock); | |
3583 | return -ETXTBSY; | |
3584 | } | |
3585 | atomic_set(&inode->i_writecount, -1); | |
3586 | spin_unlock(&inode->i_lock); | |
3587 | ||
3588 | return 0; | |
3589 | } | |
3590 | ||
3591 | static void restore_bitmap_write_access(struct file *file) | |
3592 | { | |
3593 | struct inode *inode = file->f_mapping->host; | |
3594 | ||
3595 | spin_lock(&inode->i_lock); | |
3596 | atomic_set(&inode->i_writecount, 1); | |
3597 | spin_unlock(&inode->i_lock); | |
3598 | } | |
3599 | ||
9e653b63 N |
3600 | /* mode: |
3601 | * 0 - completely stop and dis-assemble array | |
3602 | * 1 - switch to readonly | |
3603 | * 2 - stop but do not disassemble array | |
3604 | */ | |
3605 | static int do_md_stop(mddev_t * mddev, int mode) | |
1da177e4 LT |
3606 | { |
3607 | int err = 0; | |
3608 | struct gendisk *disk = mddev->gendisk; | |
3609 | ||
3610 | if (mddev->pers) { | |
3611 | if (atomic_read(&mddev->active)>2) { | |
3612 | printk("md: %s still in use.\n",mdname(mddev)); | |
3613 | return -EBUSY; | |
3614 | } | |
3615 | ||
3616 | if (mddev->sync_thread) { | |
5fd6c1dc | 3617 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3618 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3619 | md_unregister_thread(mddev->sync_thread); | |
3620 | mddev->sync_thread = NULL; | |
3621 | } | |
3622 | ||
3623 | del_timer_sync(&mddev->safemode_timer); | |
3624 | ||
3625 | invalidate_partition(disk, 0); | |
3626 | ||
9e653b63 N |
3627 | switch(mode) { |
3628 | case 1: /* readonly */ | |
1da177e4 | 3629 | err = -ENXIO; |
f91de92e | 3630 | if (mddev->ro==1) |
1da177e4 LT |
3631 | goto out; |
3632 | mddev->ro = 1; | |
9e653b63 N |
3633 | break; |
3634 | case 0: /* disassemble */ | |
3635 | case 2: /* stop */ | |
6b8b3e8a | 3636 | bitmap_flush(mddev); |
a9701a30 | 3637 | md_super_wait(mddev); |
1da177e4 LT |
3638 | if (mddev->ro) |
3639 | set_disk_ro(disk, 0); | |
3640 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3641 | mddev->pers->stop(mddev); | |
d1b5380c N |
3642 | mddev->queue->merge_bvec_fn = NULL; |
3643 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 3644 | mddev->queue->backing_dev_info.congested_fn = NULL; |
411036fa N |
3645 | if (mddev->pers->sync_request) |
3646 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
3647 | ||
1da177e4 LT |
3648 | module_put(mddev->pers->owner); |
3649 | mddev->pers = NULL; | |
0d4ca600 N |
3650 | |
3651 | set_capacity(disk, 0); | |
44ce6294 | 3652 | mddev->changed = 1; |
0d4ca600 | 3653 | |
1da177e4 LT |
3654 | if (mddev->ro) |
3655 | mddev->ro = 0; | |
3656 | } | |
850b2b42 | 3657 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
3658 | /* mark array as shutdown cleanly */ |
3659 | mddev->in_sync = 1; | |
850b2b42 | 3660 | md_update_sb(mddev, 1); |
1da177e4 | 3661 | } |
9e653b63 | 3662 | if (mode == 1) |
1da177e4 | 3663 | set_disk_ro(disk, 1); |
5fd6c1dc | 3664 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3665 | } |
32a7627c | 3666 | |
1da177e4 LT |
3667 | /* |
3668 | * Free resources if final stop | |
3669 | */ | |
9e653b63 | 3670 | if (mode == 0) { |
86e6ffdd N |
3671 | mdk_rdev_t *rdev; |
3672 | struct list_head *tmp; | |
0d4ca600 | 3673 | |
1da177e4 LT |
3674 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
3675 | ||
978f946b N |
3676 | bitmap_destroy(mddev); |
3677 | if (mddev->bitmap_file) { | |
acc55e22 | 3678 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3679 | fput(mddev->bitmap_file); |
3680 | mddev->bitmap_file = NULL; | |
3681 | } | |
3682 | mddev->bitmap_offset = 0; | |
3683 | ||
86e6ffdd N |
3684 | ITERATE_RDEV(mddev,rdev,tmp) |
3685 | if (rdev->raid_disk >= 0) { | |
3686 | char nm[20]; | |
3687 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3688 | sysfs_remove_link(&mddev->kobj, nm); | |
3689 | } | |
3690 | ||
177a99b2 | 3691 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
3692 | flush_scheduled_work(); |
3693 | ||
1da177e4 LT |
3694 | export_array(mddev); |
3695 | ||
3696 | mddev->array_size = 0; | |
9e653b63 N |
3697 | mddev->size = 0; |
3698 | mddev->raid_disks = 0; | |
a94213b1 | 3699 | mddev->recovery_cp = 0; |
c6207277 | 3700 | mddev->resync_max = MaxSector; |
08a02ecd | 3701 | mddev->reshape_position = MaxSector; |
e691063a | 3702 | mddev->external = 0; |
1ec4a939 | 3703 | mddev->persistent = 0; |
9e653b63 | 3704 | |
a8a55c38 | 3705 | } else if (mddev->pers) |
1da177e4 LT |
3706 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
3707 | mdname(mddev)); | |
3708 | err = 0; | |
d7603b7e | 3709 | md_new_event(mddev); |
1da177e4 LT |
3710 | out: |
3711 | return err; | |
3712 | } | |
3713 | ||
fdee8ae4 | 3714 | #ifndef MODULE |
1da177e4 LT |
3715 | static void autorun_array(mddev_t *mddev) |
3716 | { | |
3717 | mdk_rdev_t *rdev; | |
3718 | struct list_head *tmp; | |
3719 | int err; | |
3720 | ||
a757e64c | 3721 | if (list_empty(&mddev->disks)) |
1da177e4 | 3722 | return; |
1da177e4 LT |
3723 | |
3724 | printk(KERN_INFO "md: running: "); | |
3725 | ||
3726 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3727 | char b[BDEVNAME_SIZE]; | |
3728 | printk("<%s>", bdevname(rdev->bdev,b)); | |
3729 | } | |
3730 | printk("\n"); | |
3731 | ||
3732 | err = do_md_run (mddev); | |
3733 | if (err) { | |
3734 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
3735 | do_md_stop (mddev, 0); | |
3736 | } | |
3737 | } | |
3738 | ||
3739 | /* | |
3740 | * lets try to run arrays based on all disks that have arrived | |
3741 | * until now. (those are in pending_raid_disks) | |
3742 | * | |
3743 | * the method: pick the first pending disk, collect all disks with | |
3744 | * the same UUID, remove all from the pending list and put them into | |
3745 | * the 'same_array' list. Then order this list based on superblock | |
3746 | * update time (freshest comes first), kick out 'old' disks and | |
3747 | * compare superblocks. If everything's fine then run it. | |
3748 | * | |
3749 | * If "unit" is allocated, then bump its reference count | |
3750 | */ | |
3751 | static void autorun_devices(int part) | |
3752 | { | |
1da177e4 LT |
3753 | struct list_head *tmp; |
3754 | mdk_rdev_t *rdev0, *rdev; | |
3755 | mddev_t *mddev; | |
3756 | char b[BDEVNAME_SIZE]; | |
3757 | ||
3758 | printk(KERN_INFO "md: autorun ...\n"); | |
3759 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 3760 | int unit; |
1da177e4 | 3761 | dev_t dev; |
ad01c9e3 | 3762 | LIST_HEAD(candidates); |
1da177e4 LT |
3763 | rdev0 = list_entry(pending_raid_disks.next, |
3764 | mdk_rdev_t, same_set); | |
3765 | ||
3766 | printk(KERN_INFO "md: considering %s ...\n", | |
3767 | bdevname(rdev0->bdev,b)); | |
3768 | INIT_LIST_HEAD(&candidates); | |
3769 | ITERATE_RDEV_PENDING(rdev,tmp) | |
3770 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
3771 | printk(KERN_INFO "md: adding %s ...\n", | |
3772 | bdevname(rdev->bdev,b)); | |
3773 | list_move(&rdev->same_set, &candidates); | |
3774 | } | |
3775 | /* | |
3776 | * now we have a set of devices, with all of them having | |
3777 | * mostly sane superblocks. It's time to allocate the | |
3778 | * mddev. | |
3779 | */ | |
e8703fe1 N |
3780 | if (part) { |
3781 | dev = MKDEV(mdp_major, | |
3782 | rdev0->preferred_minor << MdpMinorShift); | |
3783 | unit = MINOR(dev) >> MdpMinorShift; | |
3784 | } else { | |
3785 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
3786 | unit = MINOR(dev); | |
3787 | } | |
3788 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
3789 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
3790 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
3791 | break; | |
3792 | } | |
1da177e4 LT |
3793 | |
3794 | md_probe(dev, NULL, NULL); | |
3795 | mddev = mddev_find(dev); | |
3796 | if (!mddev) { | |
3797 | printk(KERN_ERR | |
3798 | "md: cannot allocate memory for md drive.\n"); | |
3799 | break; | |
3800 | } | |
3801 | if (mddev_lock(mddev)) | |
3802 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
3803 | mdname(mddev)); | |
3804 | else if (mddev->raid_disks || mddev->major_version | |
3805 | || !list_empty(&mddev->disks)) { | |
3806 | printk(KERN_WARNING | |
3807 | "md: %s already running, cannot run %s\n", | |
3808 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
3809 | mddev_unlock(mddev); | |
3810 | } else { | |
3811 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 3812 | mddev->persistent = 1; |
1da177e4 LT |
3813 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { |
3814 | list_del_init(&rdev->same_set); | |
3815 | if (bind_rdev_to_array(rdev, mddev)) | |
3816 | export_rdev(rdev); | |
3817 | } | |
3818 | autorun_array(mddev); | |
3819 | mddev_unlock(mddev); | |
3820 | } | |
3821 | /* on success, candidates will be empty, on error | |
3822 | * it won't... | |
3823 | */ | |
3824 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
3825 | export_rdev(rdev); | |
3826 | mddev_put(mddev); | |
3827 | } | |
3828 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
3829 | } | |
fdee8ae4 | 3830 | #endif /* !MODULE */ |
1da177e4 | 3831 | |
1da177e4 LT |
3832 | static int get_version(void __user * arg) |
3833 | { | |
3834 | mdu_version_t ver; | |
3835 | ||
3836 | ver.major = MD_MAJOR_VERSION; | |
3837 | ver.minor = MD_MINOR_VERSION; | |
3838 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
3839 | ||
3840 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
3841 | return -EFAULT; | |
3842 | ||
3843 | return 0; | |
3844 | } | |
3845 | ||
3846 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
3847 | { | |
3848 | mdu_array_info_t info; | |
3849 | int nr,working,active,failed,spare; | |
3850 | mdk_rdev_t *rdev; | |
3851 | struct list_head *tmp; | |
3852 | ||
3853 | nr=working=active=failed=spare=0; | |
3854 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3855 | nr++; | |
b2d444d7 | 3856 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3857 | failed++; |
3858 | else { | |
3859 | working++; | |
b2d444d7 | 3860 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
3861 | active++; |
3862 | else | |
3863 | spare++; | |
3864 | } | |
3865 | } | |
3866 | ||
3867 | info.major_version = mddev->major_version; | |
3868 | info.minor_version = mddev->minor_version; | |
3869 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
3870 | info.ctime = mddev->ctime; | |
3871 | info.level = mddev->level; | |
3872 | info.size = mddev->size; | |
284ae7ca N |
3873 | if (info.size != mddev->size) /* overflow */ |
3874 | info.size = -1; | |
1da177e4 LT |
3875 | info.nr_disks = nr; |
3876 | info.raid_disks = mddev->raid_disks; | |
3877 | info.md_minor = mddev->md_minor; | |
3878 | info.not_persistent= !mddev->persistent; | |
3879 | ||
3880 | info.utime = mddev->utime; | |
3881 | info.state = 0; | |
3882 | if (mddev->in_sync) | |
3883 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
3884 | if (mddev->bitmap && mddev->bitmap_offset) |
3885 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3886 | info.active_disks = active; |
3887 | info.working_disks = working; | |
3888 | info.failed_disks = failed; | |
3889 | info.spare_disks = spare; | |
3890 | ||
3891 | info.layout = mddev->layout; | |
3892 | info.chunk_size = mddev->chunk_size; | |
3893 | ||
3894 | if (copy_to_user(arg, &info, sizeof(info))) | |
3895 | return -EFAULT; | |
3896 | ||
3897 | return 0; | |
3898 | } | |
3899 | ||
87162a28 | 3900 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
3901 | { |
3902 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
3903 | char *ptr, *buf = NULL; | |
3904 | int err = -ENOMEM; | |
3905 | ||
2a2275d6 N |
3906 | md_allow_write(mddev); |
3907 | ||
32a7627c N |
3908 | file = kmalloc(sizeof(*file), GFP_KERNEL); |
3909 | if (!file) | |
3910 | goto out; | |
3911 | ||
3912 | /* bitmap disabled, zero the first byte and copy out */ | |
3913 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
3914 | file->pathname[0] = '\0'; | |
3915 | goto copy_out; | |
3916 | } | |
3917 | ||
3918 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
3919 | if (!buf) | |
3920 | goto out; | |
3921 | ||
3922 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
3923 | if (!ptr) | |
3924 | goto out; | |
3925 | ||
3926 | strcpy(file->pathname, ptr); | |
3927 | ||
3928 | copy_out: | |
3929 | err = 0; | |
3930 | if (copy_to_user(arg, file, sizeof(*file))) | |
3931 | err = -EFAULT; | |
3932 | out: | |
3933 | kfree(buf); | |
3934 | kfree(file); | |
3935 | return err; | |
3936 | } | |
3937 | ||
1da177e4 LT |
3938 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
3939 | { | |
3940 | mdu_disk_info_t info; | |
3941 | unsigned int nr; | |
3942 | mdk_rdev_t *rdev; | |
3943 | ||
3944 | if (copy_from_user(&info, arg, sizeof(info))) | |
3945 | return -EFAULT; | |
3946 | ||
3947 | nr = info.number; | |
3948 | ||
3949 | rdev = find_rdev_nr(mddev, nr); | |
3950 | if (rdev) { | |
3951 | info.major = MAJOR(rdev->bdev->bd_dev); | |
3952 | info.minor = MINOR(rdev->bdev->bd_dev); | |
3953 | info.raid_disk = rdev->raid_disk; | |
3954 | info.state = 0; | |
b2d444d7 | 3955 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3956 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 3957 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
3958 | info.state |= (1<<MD_DISK_ACTIVE); |
3959 | info.state |= (1<<MD_DISK_SYNC); | |
3960 | } | |
8ddf9efe N |
3961 | if (test_bit(WriteMostly, &rdev->flags)) |
3962 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
3963 | } else { |
3964 | info.major = info.minor = 0; | |
3965 | info.raid_disk = -1; | |
3966 | info.state = (1<<MD_DISK_REMOVED); | |
3967 | } | |
3968 | ||
3969 | if (copy_to_user(arg, &info, sizeof(info))) | |
3970 | return -EFAULT; | |
3971 | ||
3972 | return 0; | |
3973 | } | |
3974 | ||
3975 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
3976 | { | |
3977 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3978 | mdk_rdev_t *rdev; | |
3979 | dev_t dev = MKDEV(info->major,info->minor); | |
3980 | ||
3981 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
3982 | return -EOVERFLOW; | |
3983 | ||
3984 | if (!mddev->raid_disks) { | |
3985 | int err; | |
3986 | /* expecting a device which has a superblock */ | |
3987 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
3988 | if (IS_ERR(rdev)) { | |
3989 | printk(KERN_WARNING | |
3990 | "md: md_import_device returned %ld\n", | |
3991 | PTR_ERR(rdev)); | |
3992 | return PTR_ERR(rdev); | |
3993 | } | |
3994 | if (!list_empty(&mddev->disks)) { | |
3995 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3996 | mdk_rdev_t, same_set); | |
3997 | int err = super_types[mddev->major_version] | |
3998 | .load_super(rdev, rdev0, mddev->minor_version); | |
3999 | if (err < 0) { | |
4000 | printk(KERN_WARNING | |
4001 | "md: %s has different UUID to %s\n", | |
4002 | bdevname(rdev->bdev,b), | |
4003 | bdevname(rdev0->bdev,b2)); | |
4004 | export_rdev(rdev); | |
4005 | return -EINVAL; | |
4006 | } | |
4007 | } | |
4008 | err = bind_rdev_to_array(rdev, mddev); | |
4009 | if (err) | |
4010 | export_rdev(rdev); | |
4011 | return err; | |
4012 | } | |
4013 | ||
4014 | /* | |
4015 | * add_new_disk can be used once the array is assembled | |
4016 | * to add "hot spares". They must already have a superblock | |
4017 | * written | |
4018 | */ | |
4019 | if (mddev->pers) { | |
4020 | int err; | |
4021 | if (!mddev->pers->hot_add_disk) { | |
4022 | printk(KERN_WARNING | |
4023 | "%s: personality does not support diskops!\n", | |
4024 | mdname(mddev)); | |
4025 | return -EINVAL; | |
4026 | } | |
7b1e35f6 N |
4027 | if (mddev->persistent) |
4028 | rdev = md_import_device(dev, mddev->major_version, | |
4029 | mddev->minor_version); | |
4030 | else | |
4031 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4032 | if (IS_ERR(rdev)) { |
4033 | printk(KERN_WARNING | |
4034 | "md: md_import_device returned %ld\n", | |
4035 | PTR_ERR(rdev)); | |
4036 | return PTR_ERR(rdev); | |
4037 | } | |
41158c7e N |
4038 | /* set save_raid_disk if appropriate */ |
4039 | if (!mddev->persistent) { | |
4040 | if (info->state & (1<<MD_DISK_SYNC) && | |
4041 | info->raid_disk < mddev->raid_disks) | |
4042 | rdev->raid_disk = info->raid_disk; | |
4043 | else | |
4044 | rdev->raid_disk = -1; | |
4045 | } else | |
4046 | super_types[mddev->major_version]. | |
4047 | validate_super(mddev, rdev); | |
4048 | rdev->saved_raid_disk = rdev->raid_disk; | |
4049 | ||
b2d444d7 | 4050 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4051 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4052 | set_bit(WriteMostly, &rdev->flags); | |
4053 | ||
1da177e4 LT |
4054 | rdev->raid_disk = -1; |
4055 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4056 | if (!err && !mddev->pers->hot_remove_disk) { |
4057 | /* If there is hot_add_disk but no hot_remove_disk | |
4058 | * then added disks for geometry changes, | |
4059 | * and should be added immediately. | |
4060 | */ | |
4061 | super_types[mddev->major_version]. | |
4062 | validate_super(mddev, rdev); | |
4063 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4064 | if (err) | |
4065 | unbind_rdev_from_array(rdev); | |
4066 | } | |
1da177e4 LT |
4067 | if (err) |
4068 | export_rdev(rdev); | |
c361777f | 4069 | |
17571284 | 4070 | md_update_sb(mddev, 1); |
c361777f | 4071 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4072 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4073 | return err; |
4074 | } | |
4075 | ||
4076 | /* otherwise, add_new_disk is only allowed | |
4077 | * for major_version==0 superblocks | |
4078 | */ | |
4079 | if (mddev->major_version != 0) { | |
4080 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4081 | mdname(mddev)); | |
4082 | return -EINVAL; | |
4083 | } | |
4084 | ||
4085 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4086 | int err; | |
4087 | rdev = md_import_device (dev, -1, 0); | |
4088 | if (IS_ERR(rdev)) { | |
4089 | printk(KERN_WARNING | |
4090 | "md: error, md_import_device() returned %ld\n", | |
4091 | PTR_ERR(rdev)); | |
4092 | return PTR_ERR(rdev); | |
4093 | } | |
4094 | rdev->desc_nr = info->number; | |
4095 | if (info->raid_disk < mddev->raid_disks) | |
4096 | rdev->raid_disk = info->raid_disk; | |
4097 | else | |
4098 | rdev->raid_disk = -1; | |
4099 | ||
1da177e4 | 4100 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4101 | if (info->state & (1<<MD_DISK_SYNC)) |
4102 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4103 | |
8ddf9efe N |
4104 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4105 | set_bit(WriteMostly, &rdev->flags); | |
4106 | ||
1da177e4 LT |
4107 | if (!mddev->persistent) { |
4108 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
4109 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
4110 | } else | |
4111 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
4112 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
4113 | ||
2bf071bf N |
4114 | err = bind_rdev_to_array(rdev, mddev); |
4115 | if (err) { | |
4116 | export_rdev(rdev); | |
4117 | return err; | |
4118 | } | |
1da177e4 LT |
4119 | } |
4120 | ||
4121 | return 0; | |
4122 | } | |
4123 | ||
4124 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4125 | { | |
4126 | char b[BDEVNAME_SIZE]; | |
4127 | mdk_rdev_t *rdev; | |
4128 | ||
4129 | if (!mddev->pers) | |
4130 | return -ENODEV; | |
4131 | ||
4132 | rdev = find_rdev(mddev, dev); | |
4133 | if (!rdev) | |
4134 | return -ENXIO; | |
4135 | ||
4136 | if (rdev->raid_disk >= 0) | |
4137 | goto busy; | |
4138 | ||
4139 | kick_rdev_from_array(rdev); | |
850b2b42 | 4140 | md_update_sb(mddev, 1); |
d7603b7e | 4141 | md_new_event(mddev); |
1da177e4 LT |
4142 | |
4143 | return 0; | |
4144 | busy: | |
4145 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
4146 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4147 | return -EBUSY; | |
4148 | } | |
4149 | ||
4150 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4151 | { | |
4152 | char b[BDEVNAME_SIZE]; | |
4153 | int err; | |
4154 | unsigned int size; | |
4155 | mdk_rdev_t *rdev; | |
4156 | ||
4157 | if (!mddev->pers) | |
4158 | return -ENODEV; | |
4159 | ||
4160 | if (mddev->major_version != 0) { | |
4161 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4162 | " version-0 superblocks.\n", | |
4163 | mdname(mddev)); | |
4164 | return -EINVAL; | |
4165 | } | |
4166 | if (!mddev->pers->hot_add_disk) { | |
4167 | printk(KERN_WARNING | |
4168 | "%s: personality does not support diskops!\n", | |
4169 | mdname(mddev)); | |
4170 | return -EINVAL; | |
4171 | } | |
4172 | ||
4173 | rdev = md_import_device (dev, -1, 0); | |
4174 | if (IS_ERR(rdev)) { | |
4175 | printk(KERN_WARNING | |
4176 | "md: error, md_import_device() returned %ld\n", | |
4177 | PTR_ERR(rdev)); | |
4178 | return -EINVAL; | |
4179 | } | |
4180 | ||
4181 | if (mddev->persistent) | |
4182 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
4183 | else | |
4184 | rdev->sb_offset = | |
4185 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
4186 | ||
4187 | size = calc_dev_size(rdev, mddev->chunk_size); | |
4188 | rdev->size = size; | |
4189 | ||
b2d444d7 | 4190 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4191 | printk(KERN_WARNING |
4192 | "md: can not hot-add faulty %s disk to %s!\n", | |
4193 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4194 | err = -EINVAL; | |
4195 | goto abort_export; | |
4196 | } | |
b2d444d7 | 4197 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4198 | rdev->desc_nr = -1; |
5842730d | 4199 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4200 | err = bind_rdev_to_array(rdev, mddev); |
4201 | if (err) | |
4202 | goto abort_export; | |
1da177e4 LT |
4203 | |
4204 | /* | |
4205 | * The rest should better be atomic, we can have disk failures | |
4206 | * noticed in interrupt contexts ... | |
4207 | */ | |
4208 | ||
4209 | if (rdev->desc_nr == mddev->max_disks) { | |
4210 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4211 | mdname(mddev)); | |
4212 | err = -EBUSY; | |
4213 | goto abort_unbind_export; | |
4214 | } | |
4215 | ||
4216 | rdev->raid_disk = -1; | |
4217 | ||
850b2b42 | 4218 | md_update_sb(mddev, 1); |
1da177e4 LT |
4219 | |
4220 | /* | |
4221 | * Kick recovery, maybe this spare has to be added to the | |
4222 | * array immediately. | |
4223 | */ | |
4224 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4225 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4226 | md_new_event(mddev); |
1da177e4 LT |
4227 | return 0; |
4228 | ||
4229 | abort_unbind_export: | |
4230 | unbind_rdev_from_array(rdev); | |
4231 | ||
4232 | abort_export: | |
4233 | export_rdev(rdev); | |
4234 | return err; | |
4235 | } | |
4236 | ||
32a7627c N |
4237 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4238 | { | |
4239 | int err; | |
4240 | ||
36fa3063 N |
4241 | if (mddev->pers) { |
4242 | if (!mddev->pers->quiesce) | |
4243 | return -EBUSY; | |
4244 | if (mddev->recovery || mddev->sync_thread) | |
4245 | return -EBUSY; | |
4246 | /* we should be able to change the bitmap.. */ | |
4247 | } | |
32a7627c | 4248 | |
32a7627c | 4249 | |
36fa3063 N |
4250 | if (fd >= 0) { |
4251 | if (mddev->bitmap) | |
4252 | return -EEXIST; /* cannot add when bitmap is present */ | |
4253 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4254 | |
36fa3063 N |
4255 | if (mddev->bitmap_file == NULL) { |
4256 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4257 | mdname(mddev)); | |
4258 | return -EBADF; | |
4259 | } | |
4260 | ||
4261 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4262 | if (err) { | |
4263 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4264 | mdname(mddev)); | |
4265 | fput(mddev->bitmap_file); | |
4266 | mddev->bitmap_file = NULL; | |
4267 | return err; | |
4268 | } | |
a654b9d8 | 4269 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4270 | } else if (mddev->bitmap == NULL) |
4271 | return -ENOENT; /* cannot remove what isn't there */ | |
4272 | err = 0; | |
4273 | if (mddev->pers) { | |
4274 | mddev->pers->quiesce(mddev, 1); | |
4275 | if (fd >= 0) | |
4276 | err = bitmap_create(mddev); | |
d7375ab3 | 4277 | if (fd < 0 || err) { |
36fa3063 | 4278 | bitmap_destroy(mddev); |
d7375ab3 N |
4279 | fd = -1; /* make sure to put the file */ |
4280 | } | |
36fa3063 | 4281 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4282 | } |
4283 | if (fd < 0) { | |
acc55e22 N |
4284 | if (mddev->bitmap_file) { |
4285 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4286 | fput(mddev->bitmap_file); |
acc55e22 | 4287 | } |
36fa3063 N |
4288 | mddev->bitmap_file = NULL; |
4289 | } | |
4290 | ||
32a7627c N |
4291 | return err; |
4292 | } | |
4293 | ||
1da177e4 LT |
4294 | /* |
4295 | * set_array_info is used two different ways | |
4296 | * The original usage is when creating a new array. | |
4297 | * In this usage, raid_disks is > 0 and it together with | |
4298 | * level, size, not_persistent,layout,chunksize determine the | |
4299 | * shape of the array. | |
4300 | * This will always create an array with a type-0.90.0 superblock. | |
4301 | * The newer usage is when assembling an array. | |
4302 | * In this case raid_disks will be 0, and the major_version field is | |
4303 | * use to determine which style super-blocks are to be found on the devices. | |
4304 | * The minor and patch _version numbers are also kept incase the | |
4305 | * super_block handler wishes to interpret them. | |
4306 | */ | |
4307 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4308 | { | |
4309 | ||
4310 | if (info->raid_disks == 0) { | |
4311 | /* just setting version number for superblock loading */ | |
4312 | if (info->major_version < 0 || | |
50511da3 | 4313 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4314 | super_types[info->major_version].name == NULL) { |
4315 | /* maybe try to auto-load a module? */ | |
4316 | printk(KERN_INFO | |
4317 | "md: superblock version %d not known\n", | |
4318 | info->major_version); | |
4319 | return -EINVAL; | |
4320 | } | |
4321 | mddev->major_version = info->major_version; | |
4322 | mddev->minor_version = info->minor_version; | |
4323 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4324 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4325 | return 0; |
4326 | } | |
4327 | mddev->major_version = MD_MAJOR_VERSION; | |
4328 | mddev->minor_version = MD_MINOR_VERSION; | |
4329 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4330 | mddev->ctime = get_seconds(); | |
4331 | ||
4332 | mddev->level = info->level; | |
17115e03 | 4333 | mddev->clevel[0] = 0; |
1da177e4 LT |
4334 | mddev->size = info->size; |
4335 | mddev->raid_disks = info->raid_disks; | |
4336 | /* don't set md_minor, it is determined by which /dev/md* was | |
4337 | * openned | |
4338 | */ | |
4339 | if (info->state & (1<<MD_SB_CLEAN)) | |
4340 | mddev->recovery_cp = MaxSector; | |
4341 | else | |
4342 | mddev->recovery_cp = 0; | |
4343 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4344 | mddev->external = 0; |
1da177e4 LT |
4345 | |
4346 | mddev->layout = info->layout; | |
4347 | mddev->chunk_size = info->chunk_size; | |
4348 | ||
4349 | mddev->max_disks = MD_SB_DISKS; | |
4350 | ||
e691063a N |
4351 | if (mddev->persistent) |
4352 | mddev->flags = 0; | |
850b2b42 | 4353 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4354 | |
b2a2703c N |
4355 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4356 | mddev->bitmap_offset = 0; | |
4357 | ||
f6705578 N |
4358 | mddev->reshape_position = MaxSector; |
4359 | ||
1da177e4 LT |
4360 | /* |
4361 | * Generate a 128 bit UUID | |
4362 | */ | |
4363 | get_random_bytes(mddev->uuid, 16); | |
4364 | ||
f6705578 N |
4365 | mddev->new_level = mddev->level; |
4366 | mddev->new_chunk = mddev->chunk_size; | |
4367 | mddev->new_layout = mddev->layout; | |
4368 | mddev->delta_disks = 0; | |
4369 | ||
1da177e4 LT |
4370 | return 0; |
4371 | } | |
4372 | ||
a35b0d69 N |
4373 | static int update_size(mddev_t *mddev, unsigned long size) |
4374 | { | |
4375 | mdk_rdev_t * rdev; | |
4376 | int rv; | |
4377 | struct list_head *tmp; | |
8ddeeae5 | 4378 | int fit = (size == 0); |
a35b0d69 N |
4379 | |
4380 | if (mddev->pers->resize == NULL) | |
4381 | return -EINVAL; | |
4382 | /* The "size" is the amount of each device that is used. | |
4383 | * This can only make sense for arrays with redundancy. | |
4384 | * linear and raid0 always use whatever space is available | |
4385 | * We can only consider changing the size if no resync | |
4386 | * or reconstruction is happening, and if the new size | |
4387 | * is acceptable. It must fit before the sb_offset or, | |
4388 | * if that is <data_offset, it must fit before the | |
4389 | * size of each device. | |
4390 | * If size is zero, we find the largest size that fits. | |
4391 | */ | |
4392 | if (mddev->sync_thread) | |
4393 | return -EBUSY; | |
4394 | ITERATE_RDEV(mddev,rdev,tmp) { | |
4395 | sector_t avail; | |
01ab5662 N |
4396 | avail = rdev->size * 2; |
4397 | ||
a35b0d69 N |
4398 | if (fit && (size == 0 || size > avail/2)) |
4399 | size = avail/2; | |
4400 | if (avail < ((sector_t)size << 1)) | |
4401 | return -ENOSPC; | |
4402 | } | |
4403 | rv = mddev->pers->resize(mddev, (sector_t)size *2); | |
4404 | if (!rv) { | |
4405 | struct block_device *bdev; | |
4406 | ||
4407 | bdev = bdget_disk(mddev->gendisk, 0); | |
4408 | if (bdev) { | |
1b1dcc1b | 4409 | mutex_lock(&bdev->bd_inode->i_mutex); |
6d89332b | 4410 | i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10); |
1b1dcc1b | 4411 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4412 | bdput(bdev); |
4413 | } | |
4414 | } | |
4415 | return rv; | |
4416 | } | |
4417 | ||
da943b99 N |
4418 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4419 | { | |
4420 | int rv; | |
4421 | /* change the number of raid disks */ | |
63c70c4f | 4422 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4423 | return -EINVAL; |
4424 | if (raid_disks <= 0 || | |
4425 | raid_disks >= mddev->max_disks) | |
4426 | return -EINVAL; | |
63c70c4f | 4427 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4428 | return -EBUSY; |
63c70c4f N |
4429 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4430 | ||
4431 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4432 | return rv; |
4433 | } | |
4434 | ||
4435 | ||
1da177e4 LT |
4436 | /* |
4437 | * update_array_info is used to change the configuration of an | |
4438 | * on-line array. | |
4439 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4440 | * fields in the info are checked against the array. | |
4441 | * Any differences that cannot be handled will cause an error. | |
4442 | * Normally, only one change can be managed at a time. | |
4443 | */ | |
4444 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4445 | { | |
4446 | int rv = 0; | |
4447 | int cnt = 0; | |
36fa3063 N |
4448 | int state = 0; |
4449 | ||
4450 | /* calculate expected state,ignoring low bits */ | |
4451 | if (mddev->bitmap && mddev->bitmap_offset) | |
4452 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4453 | |
4454 | if (mddev->major_version != info->major_version || | |
4455 | mddev->minor_version != info->minor_version || | |
4456 | /* mddev->patch_version != info->patch_version || */ | |
4457 | mddev->ctime != info->ctime || | |
4458 | mddev->level != info->level || | |
4459 | /* mddev->layout != info->layout || */ | |
4460 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4461 | mddev->chunk_size != info->chunk_size || |
4462 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4463 | ((state^info->state) & 0xfffffe00) | |
4464 | ) | |
1da177e4 LT |
4465 | return -EINVAL; |
4466 | /* Check there is only one change */ | |
284ae7ca | 4467 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4468 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4469 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4470 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4471 | if (cnt == 0) return 0; |
4472 | if (cnt > 1) return -EINVAL; | |
4473 | ||
4474 | if (mddev->layout != info->layout) { | |
4475 | /* Change layout | |
4476 | * we don't need to do anything at the md level, the | |
4477 | * personality will take care of it all. | |
4478 | */ | |
4479 | if (mddev->pers->reconfig == NULL) | |
4480 | return -EINVAL; | |
4481 | else | |
4482 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4483 | } | |
284ae7ca | 4484 | if (info->size >= 0 && mddev->size != info->size) |
a35b0d69 N |
4485 | rv = update_size(mddev, info->size); |
4486 | ||
da943b99 N |
4487 | if (mddev->raid_disks != info->raid_disks) |
4488 | rv = update_raid_disks(mddev, info->raid_disks); | |
4489 | ||
36fa3063 N |
4490 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4491 | if (mddev->pers->quiesce == NULL) | |
4492 | return -EINVAL; | |
4493 | if (mddev->recovery || mddev->sync_thread) | |
4494 | return -EBUSY; | |
4495 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4496 | /* add the bitmap */ | |
4497 | if (mddev->bitmap) | |
4498 | return -EEXIST; | |
4499 | if (mddev->default_bitmap_offset == 0) | |
4500 | return -EINVAL; | |
4501 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4502 | mddev->pers->quiesce(mddev, 1); | |
4503 | rv = bitmap_create(mddev); | |
4504 | if (rv) | |
4505 | bitmap_destroy(mddev); | |
4506 | mddev->pers->quiesce(mddev, 0); | |
4507 | } else { | |
4508 | /* remove the bitmap */ | |
4509 | if (!mddev->bitmap) | |
4510 | return -ENOENT; | |
4511 | if (mddev->bitmap->file) | |
4512 | return -EINVAL; | |
4513 | mddev->pers->quiesce(mddev, 1); | |
4514 | bitmap_destroy(mddev); | |
4515 | mddev->pers->quiesce(mddev, 0); | |
4516 | mddev->bitmap_offset = 0; | |
4517 | } | |
4518 | } | |
850b2b42 | 4519 | md_update_sb(mddev, 1); |
1da177e4 LT |
4520 | return rv; |
4521 | } | |
4522 | ||
4523 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4524 | { | |
4525 | mdk_rdev_t *rdev; | |
4526 | ||
4527 | if (mddev->pers == NULL) | |
4528 | return -ENODEV; | |
4529 | ||
4530 | rdev = find_rdev(mddev, dev); | |
4531 | if (!rdev) | |
4532 | return -ENODEV; | |
4533 | ||
4534 | md_error(mddev, rdev); | |
4535 | return 0; | |
4536 | } | |
4537 | ||
a885c8c4 CH |
4538 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4539 | { | |
4540 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4541 | ||
4542 | geo->heads = 2; | |
4543 | geo->sectors = 4; | |
4544 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4545 | return 0; | |
4546 | } | |
4547 | ||
1da177e4 LT |
4548 | static int md_ioctl(struct inode *inode, struct file *file, |
4549 | unsigned int cmd, unsigned long arg) | |
4550 | { | |
4551 | int err = 0; | |
4552 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4553 | mddev_t *mddev = NULL; |
4554 | ||
4555 | if (!capable(CAP_SYS_ADMIN)) | |
4556 | return -EACCES; | |
4557 | ||
4558 | /* | |
4559 | * Commands dealing with the RAID driver but not any | |
4560 | * particular array: | |
4561 | */ | |
4562 | switch (cmd) | |
4563 | { | |
4564 | case RAID_VERSION: | |
4565 | err = get_version(argp); | |
4566 | goto done; | |
4567 | ||
4568 | case PRINT_RAID_DEBUG: | |
4569 | err = 0; | |
4570 | md_print_devices(); | |
4571 | goto done; | |
4572 | ||
4573 | #ifndef MODULE | |
4574 | case RAID_AUTORUN: | |
4575 | err = 0; | |
4576 | autostart_arrays(arg); | |
4577 | goto done; | |
4578 | #endif | |
4579 | default:; | |
4580 | } | |
4581 | ||
4582 | /* | |
4583 | * Commands creating/starting a new array: | |
4584 | */ | |
4585 | ||
4586 | mddev = inode->i_bdev->bd_disk->private_data; | |
4587 | ||
4588 | if (!mddev) { | |
4589 | BUG(); | |
4590 | goto abort; | |
4591 | } | |
4592 | ||
1da177e4 LT |
4593 | err = mddev_lock(mddev); |
4594 | if (err) { | |
4595 | printk(KERN_INFO | |
4596 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4597 | err, cmd); | |
4598 | goto abort; | |
4599 | } | |
4600 | ||
4601 | switch (cmd) | |
4602 | { | |
4603 | case SET_ARRAY_INFO: | |
4604 | { | |
4605 | mdu_array_info_t info; | |
4606 | if (!arg) | |
4607 | memset(&info, 0, sizeof(info)); | |
4608 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4609 | err = -EFAULT; | |
4610 | goto abort_unlock; | |
4611 | } | |
4612 | if (mddev->pers) { | |
4613 | err = update_array_info(mddev, &info); | |
4614 | if (err) { | |
4615 | printk(KERN_WARNING "md: couldn't update" | |
4616 | " array info. %d\n", err); | |
4617 | goto abort_unlock; | |
4618 | } | |
4619 | goto done_unlock; | |
4620 | } | |
4621 | if (!list_empty(&mddev->disks)) { | |
4622 | printk(KERN_WARNING | |
4623 | "md: array %s already has disks!\n", | |
4624 | mdname(mddev)); | |
4625 | err = -EBUSY; | |
4626 | goto abort_unlock; | |
4627 | } | |
4628 | if (mddev->raid_disks) { | |
4629 | printk(KERN_WARNING | |
4630 | "md: array %s already initialised!\n", | |
4631 | mdname(mddev)); | |
4632 | err = -EBUSY; | |
4633 | goto abort_unlock; | |
4634 | } | |
4635 | err = set_array_info(mddev, &info); | |
4636 | if (err) { | |
4637 | printk(KERN_WARNING "md: couldn't set" | |
4638 | " array info. %d\n", err); | |
4639 | goto abort_unlock; | |
4640 | } | |
4641 | } | |
4642 | goto done_unlock; | |
4643 | ||
4644 | default:; | |
4645 | } | |
4646 | ||
4647 | /* | |
4648 | * Commands querying/configuring an existing array: | |
4649 | */ | |
32a7627c | 4650 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 4651 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
4652 | if ((!mddev->raid_disks && !mddev->external) |
4653 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
4654 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
4655 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
4656 | err = -ENODEV; |
4657 | goto abort_unlock; | |
4658 | } | |
4659 | ||
4660 | /* | |
4661 | * Commands even a read-only array can execute: | |
4662 | */ | |
4663 | switch (cmd) | |
4664 | { | |
4665 | case GET_ARRAY_INFO: | |
4666 | err = get_array_info(mddev, argp); | |
4667 | goto done_unlock; | |
4668 | ||
32a7627c | 4669 | case GET_BITMAP_FILE: |
87162a28 | 4670 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
4671 | goto done_unlock; |
4672 | ||
1da177e4 LT |
4673 | case GET_DISK_INFO: |
4674 | err = get_disk_info(mddev, argp); | |
4675 | goto done_unlock; | |
4676 | ||
4677 | case RESTART_ARRAY_RW: | |
4678 | err = restart_array(mddev); | |
4679 | goto done_unlock; | |
4680 | ||
4681 | case STOP_ARRAY: | |
4682 | err = do_md_stop (mddev, 0); | |
4683 | goto done_unlock; | |
4684 | ||
4685 | case STOP_ARRAY_RO: | |
4686 | err = do_md_stop (mddev, 1); | |
4687 | goto done_unlock; | |
4688 | ||
4689 | /* | |
4690 | * We have a problem here : there is no easy way to give a CHS | |
4691 | * virtual geometry. We currently pretend that we have a 2 heads | |
4692 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4693 | * dosfs just mad... ;-) | |
4694 | */ | |
1da177e4 LT |
4695 | } |
4696 | ||
4697 | /* | |
4698 | * The remaining ioctls are changing the state of the | |
f91de92e N |
4699 | * superblock, so we do not allow them on read-only arrays. |
4700 | * However non-MD ioctls (e.g. get-size) will still come through | |
4701 | * here and hit the 'default' below, so only disallow | |
4702 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 4703 | */ |
f91de92e N |
4704 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
4705 | mddev->ro && mddev->pers) { | |
4706 | if (mddev->ro == 2) { | |
4707 | mddev->ro = 0; | |
4708 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4709 | md_wakeup_thread(mddev->thread); | |
4710 | ||
4711 | } else { | |
4712 | err = -EROFS; | |
4713 | goto abort_unlock; | |
4714 | } | |
1da177e4 LT |
4715 | } |
4716 | ||
4717 | switch (cmd) | |
4718 | { | |
4719 | case ADD_NEW_DISK: | |
4720 | { | |
4721 | mdu_disk_info_t info; | |
4722 | if (copy_from_user(&info, argp, sizeof(info))) | |
4723 | err = -EFAULT; | |
4724 | else | |
4725 | err = add_new_disk(mddev, &info); | |
4726 | goto done_unlock; | |
4727 | } | |
4728 | ||
4729 | case HOT_REMOVE_DISK: | |
4730 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
4731 | goto done_unlock; | |
4732 | ||
4733 | case HOT_ADD_DISK: | |
4734 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
4735 | goto done_unlock; | |
4736 | ||
4737 | case SET_DISK_FAULTY: | |
4738 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
4739 | goto done_unlock; | |
4740 | ||
4741 | case RUN_ARRAY: | |
4742 | err = do_md_run (mddev); | |
4743 | goto done_unlock; | |
4744 | ||
32a7627c N |
4745 | case SET_BITMAP_FILE: |
4746 | err = set_bitmap_file(mddev, (int)arg); | |
4747 | goto done_unlock; | |
4748 | ||
1da177e4 | 4749 | default: |
1da177e4 LT |
4750 | err = -EINVAL; |
4751 | goto abort_unlock; | |
4752 | } | |
4753 | ||
4754 | done_unlock: | |
4755 | abort_unlock: | |
4756 | mddev_unlock(mddev); | |
4757 | ||
4758 | return err; | |
4759 | done: | |
4760 | if (err) | |
4761 | MD_BUG(); | |
4762 | abort: | |
4763 | return err; | |
4764 | } | |
4765 | ||
4766 | static int md_open(struct inode *inode, struct file *file) | |
4767 | { | |
4768 | /* | |
4769 | * Succeed if we can lock the mddev, which confirms that | |
4770 | * it isn't being stopped right now. | |
4771 | */ | |
4772 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4773 | int err; | |
4774 | ||
d63a5a74 | 4775 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
4776 | goto out; |
4777 | ||
4778 | err = 0; | |
4779 | mddev_get(mddev); | |
4780 | mddev_unlock(mddev); | |
4781 | ||
4782 | check_disk_change(inode->i_bdev); | |
4783 | out: | |
4784 | return err; | |
4785 | } | |
4786 | ||
4787 | static int md_release(struct inode *inode, struct file * file) | |
4788 | { | |
4789 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4790 | ||
52e5f9d1 | 4791 | BUG_ON(!mddev); |
1da177e4 LT |
4792 | mddev_put(mddev); |
4793 | ||
4794 | return 0; | |
4795 | } | |
4796 | ||
44ce6294 LT |
4797 | static int md_media_changed(struct gendisk *disk) |
4798 | { | |
4799 | mddev_t *mddev = disk->private_data; | |
4800 | ||
4801 | return mddev->changed; | |
4802 | } | |
4803 | ||
4804 | static int md_revalidate(struct gendisk *disk) | |
4805 | { | |
4806 | mddev_t *mddev = disk->private_data; | |
4807 | ||
4808 | mddev->changed = 0; | |
4809 | return 0; | |
4810 | } | |
1da177e4 LT |
4811 | static struct block_device_operations md_fops = |
4812 | { | |
4813 | .owner = THIS_MODULE, | |
4814 | .open = md_open, | |
4815 | .release = md_release, | |
4816 | .ioctl = md_ioctl, | |
a885c8c4 | 4817 | .getgeo = md_getgeo, |
44ce6294 LT |
4818 | .media_changed = md_media_changed, |
4819 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
4820 | }; |
4821 | ||
75c96f85 | 4822 | static int md_thread(void * arg) |
1da177e4 LT |
4823 | { |
4824 | mdk_thread_t *thread = arg; | |
4825 | ||
1da177e4 LT |
4826 | /* |
4827 | * md_thread is a 'system-thread', it's priority should be very | |
4828 | * high. We avoid resource deadlocks individually in each | |
4829 | * raid personality. (RAID5 does preallocation) We also use RR and | |
4830 | * the very same RT priority as kswapd, thus we will never get | |
4831 | * into a priority inversion deadlock. | |
4832 | * | |
4833 | * we definitely have to have equal or higher priority than | |
4834 | * bdflush, otherwise bdflush will deadlock if there are too | |
4835 | * many dirty RAID5 blocks. | |
4836 | */ | |
1da177e4 | 4837 | |
6985c43f | 4838 | allow_signal(SIGKILL); |
a6fb0934 | 4839 | while (!kthread_should_stop()) { |
1da177e4 | 4840 | |
93588e22 N |
4841 | /* We need to wait INTERRUPTIBLE so that |
4842 | * we don't add to the load-average. | |
4843 | * That means we need to be sure no signals are | |
4844 | * pending | |
4845 | */ | |
4846 | if (signal_pending(current)) | |
4847 | flush_signals(current); | |
4848 | ||
4849 | wait_event_interruptible_timeout | |
4850 | (thread->wqueue, | |
4851 | test_bit(THREAD_WAKEUP, &thread->flags) | |
4852 | || kthread_should_stop(), | |
4853 | thread->timeout); | |
1da177e4 LT |
4854 | |
4855 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
4856 | ||
787453c2 | 4857 | thread->run(thread->mddev); |
1da177e4 | 4858 | } |
a6fb0934 | 4859 | |
1da177e4 LT |
4860 | return 0; |
4861 | } | |
4862 | ||
4863 | void md_wakeup_thread(mdk_thread_t *thread) | |
4864 | { | |
4865 | if (thread) { | |
4866 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
4867 | set_bit(THREAD_WAKEUP, &thread->flags); | |
4868 | wake_up(&thread->wqueue); | |
4869 | } | |
4870 | } | |
4871 | ||
4872 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
4873 | const char *name) | |
4874 | { | |
4875 | mdk_thread_t *thread; | |
1da177e4 | 4876 | |
9ffae0cf | 4877 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
4878 | if (!thread) |
4879 | return NULL; | |
4880 | ||
1da177e4 LT |
4881 | init_waitqueue_head(&thread->wqueue); |
4882 | ||
1da177e4 LT |
4883 | thread->run = run; |
4884 | thread->mddev = mddev; | |
32a7627c | 4885 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 4886 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 4887 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
4888 | kfree(thread); |
4889 | return NULL; | |
4890 | } | |
1da177e4 LT |
4891 | return thread; |
4892 | } | |
4893 | ||
1da177e4 LT |
4894 | void md_unregister_thread(mdk_thread_t *thread) |
4895 | { | |
ba25f9dc | 4896 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
4897 | |
4898 | kthread_stop(thread->tsk); | |
1da177e4 LT |
4899 | kfree(thread); |
4900 | } | |
4901 | ||
4902 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
4903 | { | |
4904 | if (!mddev) { | |
4905 | MD_BUG(); | |
4906 | return; | |
4907 | } | |
4908 | ||
b2d444d7 | 4909 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4910 | return; |
32a7627c | 4911 | /* |
1da177e4 LT |
4912 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
4913 | mdname(mddev), | |
4914 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
4915 | __builtin_return_address(0),__builtin_return_address(1), | |
4916 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 4917 | */ |
d0a0a5ee AM |
4918 | if (!mddev->pers) |
4919 | return; | |
1da177e4 LT |
4920 | if (!mddev->pers->error_handler) |
4921 | return; | |
4922 | mddev->pers->error_handler(mddev,rdev); | |
4923 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4924 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4925 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 4926 | md_new_event_inintr(mddev); |
1da177e4 LT |
4927 | } |
4928 | ||
4929 | /* seq_file implementation /proc/mdstat */ | |
4930 | ||
4931 | static void status_unused(struct seq_file *seq) | |
4932 | { | |
4933 | int i = 0; | |
4934 | mdk_rdev_t *rdev; | |
4935 | struct list_head *tmp; | |
4936 | ||
4937 | seq_printf(seq, "unused devices: "); | |
4938 | ||
4939 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
4940 | char b[BDEVNAME_SIZE]; | |
4941 | i++; | |
4942 | seq_printf(seq, "%s ", | |
4943 | bdevname(rdev->bdev,b)); | |
4944 | } | |
4945 | if (!i) | |
4946 | seq_printf(seq, "<none>"); | |
4947 | ||
4948 | seq_printf(seq, "\n"); | |
4949 | } | |
4950 | ||
4951 | ||
4952 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
4953 | { | |
4588b42e N |
4954 | sector_t max_blocks, resync, res; |
4955 | unsigned long dt, db, rt; | |
4956 | int scale; | |
4957 | unsigned int per_milli; | |
1da177e4 LT |
4958 | |
4959 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
4960 | ||
4961 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4962 | max_blocks = mddev->resync_max_sectors >> 1; | |
4963 | else | |
4964 | max_blocks = mddev->size; | |
4965 | ||
4966 | /* | |
4967 | * Should not happen. | |
4968 | */ | |
4969 | if (!max_blocks) { | |
4970 | MD_BUG(); | |
4971 | return; | |
4972 | } | |
4588b42e N |
4973 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
4974 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
4975 | * u32, as those are the requirements for sector_div. | |
4976 | * Thus 'scale' must be at least 10 | |
4977 | */ | |
4978 | scale = 10; | |
4979 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
4980 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
4981 | scale++; | |
4982 | } | |
4983 | res = (resync>>scale)*1000; | |
4984 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
4985 | ||
4986 | per_milli = res; | |
1da177e4 | 4987 | { |
4588b42e | 4988 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
4989 | seq_printf(seq, "["); |
4990 | for (i = 0; i < x; i++) | |
4991 | seq_printf(seq, "="); | |
4992 | seq_printf(seq, ">"); | |
4993 | for (i = 0; i < y; i++) | |
4994 | seq_printf(seq, "."); | |
4995 | seq_printf(seq, "] "); | |
4996 | } | |
4588b42e | 4997 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
4998 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
4999 | "reshape" : | |
61df9d91 N |
5000 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5001 | "check" : | |
5002 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5003 | "resync" : "recovery"))), | |
5004 | per_milli/10, per_milli % 10, | |
4588b42e N |
5005 | (unsigned long long) resync, |
5006 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5007 | |
5008 | /* | |
5009 | * We do not want to overflow, so the order of operands and | |
5010 | * the * 100 / 100 trick are important. We do a +1 to be | |
5011 | * safe against division by zero. We only estimate anyway. | |
5012 | * | |
5013 | * dt: time from mark until now | |
5014 | * db: blocks written from mark until now | |
5015 | * rt: remaining time | |
5016 | */ | |
5017 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5018 | if (!dt) dt++; | |
ff4e8d9a N |
5019 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5020 | - mddev->resync_mark_cnt; | |
5021 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5022 | |
5023 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5024 | ||
ff4e8d9a | 5025 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5026 | } |
5027 | ||
5028 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5029 | { | |
5030 | struct list_head *tmp; | |
5031 | loff_t l = *pos; | |
5032 | mddev_t *mddev; | |
5033 | ||
5034 | if (l >= 0x10000) | |
5035 | return NULL; | |
5036 | if (!l--) | |
5037 | /* header */ | |
5038 | return (void*)1; | |
5039 | ||
5040 | spin_lock(&all_mddevs_lock); | |
5041 | list_for_each(tmp,&all_mddevs) | |
5042 | if (!l--) { | |
5043 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5044 | mddev_get(mddev); | |
5045 | spin_unlock(&all_mddevs_lock); | |
5046 | return mddev; | |
5047 | } | |
5048 | spin_unlock(&all_mddevs_lock); | |
5049 | if (!l--) | |
5050 | return (void*)2;/* tail */ | |
5051 | return NULL; | |
5052 | } | |
5053 | ||
5054 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5055 | { | |
5056 | struct list_head *tmp; | |
5057 | mddev_t *next_mddev, *mddev = v; | |
5058 | ||
5059 | ++*pos; | |
5060 | if (v == (void*)2) | |
5061 | return NULL; | |
5062 | ||
5063 | spin_lock(&all_mddevs_lock); | |
5064 | if (v == (void*)1) | |
5065 | tmp = all_mddevs.next; | |
5066 | else | |
5067 | tmp = mddev->all_mddevs.next; | |
5068 | if (tmp != &all_mddevs) | |
5069 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5070 | else { | |
5071 | next_mddev = (void*)2; | |
5072 | *pos = 0x10000; | |
5073 | } | |
5074 | spin_unlock(&all_mddevs_lock); | |
5075 | ||
5076 | if (v != (void*)1) | |
5077 | mddev_put(mddev); | |
5078 | return next_mddev; | |
5079 | ||
5080 | } | |
5081 | ||
5082 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5083 | { | |
5084 | mddev_t *mddev = v; | |
5085 | ||
5086 | if (mddev && v != (void*)1 && v != (void*)2) | |
5087 | mddev_put(mddev); | |
5088 | } | |
5089 | ||
d7603b7e N |
5090 | struct mdstat_info { |
5091 | int event; | |
5092 | }; | |
5093 | ||
1da177e4 LT |
5094 | static int md_seq_show(struct seq_file *seq, void *v) |
5095 | { | |
5096 | mddev_t *mddev = v; | |
5097 | sector_t size; | |
5098 | struct list_head *tmp2; | |
5099 | mdk_rdev_t *rdev; | |
d7603b7e | 5100 | struct mdstat_info *mi = seq->private; |
32a7627c | 5101 | struct bitmap *bitmap; |
1da177e4 LT |
5102 | |
5103 | if (v == (void*)1) { | |
2604b703 | 5104 | struct mdk_personality *pers; |
1da177e4 LT |
5105 | seq_printf(seq, "Personalities : "); |
5106 | spin_lock(&pers_lock); | |
2604b703 N |
5107 | list_for_each_entry(pers, &pers_list, list) |
5108 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5109 | |
5110 | spin_unlock(&pers_lock); | |
5111 | seq_printf(seq, "\n"); | |
d7603b7e | 5112 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5113 | return 0; |
5114 | } | |
5115 | if (v == (void*)2) { | |
5116 | status_unused(seq); | |
5117 | return 0; | |
5118 | } | |
5119 | ||
5dc5cf7d | 5120 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5121 | return -EINTR; |
5dc5cf7d | 5122 | |
1da177e4 LT |
5123 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5124 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5125 | mddev->pers ? "" : "in"); | |
5126 | if (mddev->pers) { | |
f91de92e | 5127 | if (mddev->ro==1) |
1da177e4 | 5128 | seq_printf(seq, " (read-only)"); |
f91de92e N |
5129 | if (mddev->ro==2) |
5130 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
5131 | seq_printf(seq, " %s", mddev->pers->name); |
5132 | } | |
5133 | ||
5134 | size = 0; | |
5135 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
5136 | char b[BDEVNAME_SIZE]; | |
5137 | seq_printf(seq, " %s[%d]", | |
5138 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5139 | if (test_bit(WriteMostly, &rdev->flags)) |
5140 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5141 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5142 | seq_printf(seq, "(F)"); |
5143 | continue; | |
b325a32e N |
5144 | } else if (rdev->raid_disk < 0) |
5145 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
5146 | size += rdev->size; |
5147 | } | |
5148 | ||
5149 | if (!list_empty(&mddev->disks)) { | |
5150 | if (mddev->pers) | |
5151 | seq_printf(seq, "\n %llu blocks", | |
5152 | (unsigned long long)mddev->array_size); | |
5153 | else | |
5154 | seq_printf(seq, "\n %llu blocks", | |
5155 | (unsigned long long)size); | |
5156 | } | |
1cd6bf19 N |
5157 | if (mddev->persistent) { |
5158 | if (mddev->major_version != 0 || | |
5159 | mddev->minor_version != 90) { | |
5160 | seq_printf(seq," super %d.%d", | |
5161 | mddev->major_version, | |
5162 | mddev->minor_version); | |
5163 | } | |
e691063a N |
5164 | } else if (mddev->external) |
5165 | seq_printf(seq, " super external:%s", | |
5166 | mddev->metadata_type); | |
5167 | else | |
1cd6bf19 | 5168 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5169 | |
5170 | if (mddev->pers) { | |
5171 | mddev->pers->status (seq, mddev); | |
5172 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
5173 | if (mddev->pers->sync_request) { |
5174 | if (mddev->curr_resync > 2) { | |
5175 | status_resync (seq, mddev); | |
5176 | seq_printf(seq, "\n "); | |
5177 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5178 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5179 | else if (mddev->recovery_cp < MaxSector) | |
5180 | seq_printf(seq, "\tresync=PENDING\n "); | |
5181 | } | |
32a7627c N |
5182 | } else |
5183 | seq_printf(seq, "\n "); | |
5184 | ||
5185 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5186 | unsigned long chunk_kb; |
5187 | unsigned long flags; | |
32a7627c N |
5188 | spin_lock_irqsave(&bitmap->lock, flags); |
5189 | chunk_kb = bitmap->chunksize >> 10; | |
5190 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5191 | "%lu%s chunk", | |
5192 | bitmap->pages - bitmap->missing_pages, | |
5193 | bitmap->pages, | |
5194 | (bitmap->pages - bitmap->missing_pages) | |
5195 | << (PAGE_SHIFT - 10), | |
5196 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5197 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5198 | if (bitmap->file) { |
5199 | seq_printf(seq, ", file: "); | |
c649bb9c JS |
5200 | seq_path(seq, bitmap->file->f_path.mnt, |
5201 | bitmap->file->f_path.dentry," \t\n"); | |
32a7627c | 5202 | } |
78d742d8 | 5203 | |
32a7627c N |
5204 | seq_printf(seq, "\n"); |
5205 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5206 | } |
5207 | ||
5208 | seq_printf(seq, "\n"); | |
5209 | } | |
5210 | mddev_unlock(mddev); | |
5211 | ||
5212 | return 0; | |
5213 | } | |
5214 | ||
5215 | static struct seq_operations md_seq_ops = { | |
5216 | .start = md_seq_start, | |
5217 | .next = md_seq_next, | |
5218 | .stop = md_seq_stop, | |
5219 | .show = md_seq_show, | |
5220 | }; | |
5221 | ||
5222 | static int md_seq_open(struct inode *inode, struct file *file) | |
5223 | { | |
5224 | int error; | |
d7603b7e N |
5225 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5226 | if (mi == NULL) | |
5227 | return -ENOMEM; | |
1da177e4 LT |
5228 | |
5229 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5230 | if (error) |
5231 | kfree(mi); | |
5232 | else { | |
5233 | struct seq_file *p = file->private_data; | |
5234 | p->private = mi; | |
5235 | mi->event = atomic_read(&md_event_count); | |
5236 | } | |
1da177e4 LT |
5237 | return error; |
5238 | } | |
5239 | ||
d7603b7e N |
5240 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5241 | { | |
5242 | struct seq_file *m = filp->private_data; | |
5243 | struct mdstat_info *mi = m->private; | |
5244 | int mask; | |
5245 | ||
5246 | poll_wait(filp, &md_event_waiters, wait); | |
5247 | ||
5248 | /* always allow read */ | |
5249 | mask = POLLIN | POLLRDNORM; | |
5250 | ||
5251 | if (mi->event != atomic_read(&md_event_count)) | |
5252 | mask |= POLLERR | POLLPRI; | |
5253 | return mask; | |
5254 | } | |
5255 | ||
fa027c2a | 5256 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5257 | .owner = THIS_MODULE, |
1da177e4 LT |
5258 | .open = md_seq_open, |
5259 | .read = seq_read, | |
5260 | .llseek = seq_lseek, | |
c3f94b40 | 5261 | .release = seq_release_private, |
d7603b7e | 5262 | .poll = mdstat_poll, |
1da177e4 LT |
5263 | }; |
5264 | ||
2604b703 | 5265 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5266 | { |
1da177e4 | 5267 | spin_lock(&pers_lock); |
2604b703 N |
5268 | list_add_tail(&p->list, &pers_list); |
5269 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5270 | spin_unlock(&pers_lock); |
5271 | return 0; | |
5272 | } | |
5273 | ||
2604b703 | 5274 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5275 | { |
2604b703 | 5276 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5277 | spin_lock(&pers_lock); |
2604b703 | 5278 | list_del_init(&p->list); |
1da177e4 LT |
5279 | spin_unlock(&pers_lock); |
5280 | return 0; | |
5281 | } | |
5282 | ||
5283 | static int is_mddev_idle(mddev_t *mddev) | |
5284 | { | |
5285 | mdk_rdev_t * rdev; | |
5286 | struct list_head *tmp; | |
5287 | int idle; | |
713f6ab1 | 5288 | long curr_events; |
1da177e4 LT |
5289 | |
5290 | idle = 1; | |
5291 | ITERATE_RDEV(mddev,rdev,tmp) { | |
5292 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
5293 | curr_events = disk_stat_read(disk, sectors[0]) + |
5294 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 5295 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5296 | /* sync IO will cause sync_io to increase before the disk_stats |
5297 | * as sync_io is counted when a request starts, and | |
5298 | * disk_stats is counted when it completes. | |
5299 | * So resync activity will cause curr_events to be smaller than | |
5300 | * when there was no such activity. | |
5301 | * non-sync IO will cause disk_stat to increase without | |
5302 | * increasing sync_io so curr_events will (eventually) | |
5303 | * be larger than it was before. Once it becomes | |
5304 | * substantially larger, the test below will cause | |
5305 | * the array to appear non-idle, and resync will slow | |
5306 | * down. | |
5307 | * If there is a lot of outstanding resync activity when | |
5308 | * we set last_event to curr_events, then all that activity | |
5309 | * completing might cause the array to appear non-idle | |
5310 | * and resync will be slowed down even though there might | |
5311 | * not have been non-resync activity. This will only | |
5312 | * happen once though. 'last_events' will soon reflect | |
5313 | * the state where there is little or no outstanding | |
5314 | * resync requests, and further resync activity will | |
5315 | * always make curr_events less than last_events. | |
c0e48521 | 5316 | * |
1da177e4 | 5317 | */ |
713f6ab1 | 5318 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5319 | rdev->last_events = curr_events; |
5320 | idle = 0; | |
5321 | } | |
5322 | } | |
5323 | return idle; | |
5324 | } | |
5325 | ||
5326 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5327 | { | |
5328 | /* another "blocks" (512byte) blocks have been synced */ | |
5329 | atomic_sub(blocks, &mddev->recovery_active); | |
5330 | wake_up(&mddev->recovery_wait); | |
5331 | if (!ok) { | |
5332 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5333 | md_wakeup_thread(mddev->thread); | |
5334 | // stop recovery, signal do_sync .... | |
5335 | } | |
5336 | } | |
5337 | ||
5338 | ||
06d91a5f N |
5339 | /* md_write_start(mddev, bi) |
5340 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5341 | * in superblock) before writing, schedule a superblock update |
5342 | * and wait for it to complete. | |
06d91a5f | 5343 | */ |
3d310eb7 | 5344 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5345 | { |
06d91a5f | 5346 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5347 | return; |
06d91a5f | 5348 | |
f91de92e N |
5349 | BUG_ON(mddev->ro == 1); |
5350 | if (mddev->ro == 2) { | |
5351 | /* need to switch to read/write */ | |
5352 | mddev->ro = 0; | |
5353 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5354 | md_wakeup_thread(mddev->thread); | |
5355 | } | |
06d91a5f | 5356 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 5357 | if (mddev->in_sync) { |
a9701a30 | 5358 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5359 | if (mddev->in_sync) { |
5360 | mddev->in_sync = 0; | |
850b2b42 | 5361 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 N |
5362 | md_wakeup_thread(mddev->thread); |
5363 | } | |
a9701a30 | 5364 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5365 | } |
850b2b42 | 5366 | wait_event(mddev->sb_wait, mddev->flags==0); |
1da177e4 LT |
5367 | } |
5368 | ||
5369 | void md_write_end(mddev_t *mddev) | |
5370 | { | |
5371 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5372 | if (mddev->safemode == 2) | |
5373 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5374 | else if (mddev->safemode_delay) |
1da177e4 LT |
5375 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5376 | } | |
5377 | } | |
5378 | ||
2a2275d6 N |
5379 | /* md_allow_write(mddev) |
5380 | * Calling this ensures that the array is marked 'active' so that writes | |
5381 | * may proceed without blocking. It is important to call this before | |
5382 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5383 | * Must be called with mddev_lock held. | |
5384 | */ | |
5385 | void md_allow_write(mddev_t *mddev) | |
5386 | { | |
5387 | if (!mddev->pers) | |
5388 | return; | |
5389 | if (mddev->ro) | |
5390 | return; | |
5391 | ||
5392 | spin_lock_irq(&mddev->write_lock); | |
5393 | if (mddev->in_sync) { | |
5394 | mddev->in_sync = 0; | |
5395 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5396 | if (mddev->safemode_delay && | |
5397 | mddev->safemode == 0) | |
5398 | mddev->safemode = 1; | |
5399 | spin_unlock_irq(&mddev->write_lock); | |
5400 | md_update_sb(mddev, 0); | |
5401 | } else | |
5402 | spin_unlock_irq(&mddev->write_lock); | |
5403 | } | |
5404 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5405 | ||
75c96f85 | 5406 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
5407 | |
5408 | #define SYNC_MARKS 10 | |
5409 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5410 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5411 | { |
5412 | mddev_t *mddev2; | |
5413 | unsigned int currspeed = 0, | |
5414 | window; | |
57afd89f | 5415 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5416 | unsigned long mark[SYNC_MARKS]; |
5417 | sector_t mark_cnt[SYNC_MARKS]; | |
5418 | int last_mark,m; | |
5419 | struct list_head *tmp; | |
5420 | sector_t last_check; | |
57afd89f | 5421 | int skipped = 0; |
5fd6c1dc N |
5422 | struct list_head *rtmp; |
5423 | mdk_rdev_t *rdev; | |
61df9d91 | 5424 | char *desc; |
1da177e4 LT |
5425 | |
5426 | /* just incase thread restarts... */ | |
5427 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5428 | return; | |
5fd6c1dc N |
5429 | if (mddev->ro) /* never try to sync a read-only array */ |
5430 | return; | |
1da177e4 | 5431 | |
61df9d91 N |
5432 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5433 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5434 | desc = "data-check"; | |
5435 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5436 | desc = "requested-resync"; | |
5437 | else | |
5438 | desc = "resync"; | |
5439 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5440 | desc = "reshape"; | |
5441 | else | |
5442 | desc = "recovery"; | |
5443 | ||
1da177e4 LT |
5444 | /* we overload curr_resync somewhat here. |
5445 | * 0 == not engaged in resync at all | |
5446 | * 2 == checking that there is no conflict with another sync | |
5447 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5448 | * commense | |
5449 | * other == active in resync - this many blocks | |
5450 | * | |
5451 | * Before starting a resync we must have set curr_resync to | |
5452 | * 2, and then checked that every "conflicting" array has curr_resync | |
5453 | * less than ours. When we find one that is the same or higher | |
5454 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5455 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5456 | * This will mean we have to start checking from the beginning again. | |
5457 | * | |
5458 | */ | |
5459 | ||
5460 | do { | |
5461 | mddev->curr_resync = 2; | |
5462 | ||
5463 | try_again: | |
787453c2 | 5464 | if (kthread_should_stop()) { |
6985c43f | 5465 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5466 | goto skip; |
5467 | } | |
29ac4aa3 | 5468 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
5469 | if (mddev2 == mddev) |
5470 | continue; | |
5471 | if (mddev2->curr_resync && | |
5472 | match_mddev_units(mddev,mddev2)) { | |
5473 | DEFINE_WAIT(wq); | |
5474 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5475 | /* arbitrarily yield */ | |
5476 | mddev->curr_resync = 1; | |
5477 | wake_up(&resync_wait); | |
5478 | } | |
5479 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5480 | /* no need to wait here, we can wait the next | |
5481 | * time 'round when curr_resync == 2 | |
5482 | */ | |
5483 | continue; | |
787453c2 N |
5484 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
5485 | if (!kthread_should_stop() && | |
8712e553 | 5486 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5487 | printk(KERN_INFO "md: delaying %s of %s" |
5488 | " until %s has finished (they" | |
1da177e4 | 5489 | " share one or more physical units)\n", |
61df9d91 | 5490 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 LT |
5491 | mddev_put(mddev2); |
5492 | schedule(); | |
5493 | finish_wait(&resync_wait, &wq); | |
5494 | goto try_again; | |
5495 | } | |
5496 | finish_wait(&resync_wait, &wq); | |
5497 | } | |
5498 | } | |
5499 | } while (mddev->curr_resync < 2); | |
5500 | ||
5fd6c1dc | 5501 | j = 0; |
9d88883e | 5502 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5503 | /* resync follows the size requested by the personality, |
57afd89f | 5504 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5505 | */ |
5506 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5507 | mddev->resync_mismatches = 0; |
5fd6c1dc N |
5508 | /* we don't use the checkpoint if there's a bitmap */ |
5509 | if (!mddev->bitmap && | |
5510 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5511 | j = mddev->recovery_cp; | |
ccfcc3c1 N |
5512 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5513 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5514 | else { |
1da177e4 LT |
5515 | /* recovery follows the physical size of devices */ |
5516 | max_sectors = mddev->size << 1; | |
5fd6c1dc N |
5517 | j = MaxSector; |
5518 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5519 | if (rdev->raid_disk >= 0 && | |
5520 | !test_bit(Faulty, &rdev->flags) && | |
5521 | !test_bit(In_sync, &rdev->flags) && | |
5522 | rdev->recovery_offset < j) | |
5523 | j = rdev->recovery_offset; | |
5524 | } | |
1da177e4 | 5525 | |
61df9d91 N |
5526 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5527 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5528 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5529 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5530 | "(but not more than %d KB/sec) for %s.\n", |
5531 | speed_max(mddev), desc); | |
1da177e4 LT |
5532 | |
5533 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5534 | |
57afd89f | 5535 | io_sectors = 0; |
1da177e4 LT |
5536 | for (m = 0; m < SYNC_MARKS; m++) { |
5537 | mark[m] = jiffies; | |
57afd89f | 5538 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5539 | } |
5540 | last_mark = 0; | |
5541 | mddev->resync_mark = mark[last_mark]; | |
5542 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
5543 | ||
5544 | /* | |
5545 | * Tune reconstruction: | |
5546 | */ | |
5547 | window = 32*(PAGE_SIZE/512); | |
5548 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
5549 | window/2,(unsigned long long) max_sectors/2); | |
5550 | ||
5551 | atomic_set(&mddev->recovery_active, 0); | |
5552 | init_waitqueue_head(&mddev->recovery_wait); | |
5553 | last_check = 0; | |
5554 | ||
5555 | if (j>2) { | |
5556 | printk(KERN_INFO | |
61df9d91 N |
5557 | "md: resuming %s of %s from checkpoint.\n", |
5558 | desc, mdname(mddev)); | |
1da177e4 LT |
5559 | mddev->curr_resync = j; |
5560 | } | |
5561 | ||
5562 | while (j < max_sectors) { | |
57afd89f | 5563 | sector_t sectors; |
1da177e4 | 5564 | |
57afd89f | 5565 | skipped = 0; |
c6207277 N |
5566 | if (j >= mddev->resync_max) { |
5567 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
5568 | wait_event(mddev->recovery_wait, | |
5569 | mddev->resync_max > j | |
5570 | || kthread_should_stop()); | |
5571 | } | |
5572 | if (kthread_should_stop()) | |
5573 | goto interrupted; | |
57afd89f | 5574 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 5575 | currspeed < speed_min(mddev)); |
57afd89f | 5576 | if (sectors == 0) { |
1da177e4 LT |
5577 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
5578 | goto out; | |
5579 | } | |
57afd89f N |
5580 | |
5581 | if (!skipped) { /* actual IO requested */ | |
5582 | io_sectors += sectors; | |
5583 | atomic_add(sectors, &mddev->recovery_active); | |
5584 | } | |
5585 | ||
1da177e4 LT |
5586 | j += sectors; |
5587 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 5588 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
5589 | if (last_check == 0) |
5590 | /* this is the earliers that rebuilt will be | |
5591 | * visible in /proc/mdstat | |
5592 | */ | |
5593 | md_new_event(mddev); | |
57afd89f N |
5594 | |
5595 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
5596 | continue; |
5597 | ||
57afd89f | 5598 | last_check = io_sectors; |
1da177e4 LT |
5599 | |
5600 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
5601 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
5602 | break; | |
5603 | ||
5604 | repeat: | |
5605 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
5606 | /* step marks */ | |
5607 | int next = (last_mark+1) % SYNC_MARKS; | |
5608 | ||
5609 | mddev->resync_mark = mark[next]; | |
5610 | mddev->resync_mark_cnt = mark_cnt[next]; | |
5611 | mark[next] = jiffies; | |
57afd89f | 5612 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5613 | last_mark = next; |
5614 | } | |
5615 | ||
5616 | ||
c6207277 N |
5617 | if (kthread_should_stop()) |
5618 | goto interrupted; | |
5619 | ||
1da177e4 LT |
5620 | |
5621 | /* | |
5622 | * this loop exits only if either when we are slower than | |
5623 | * the 'hard' speed limit, or the system was IO-idle for | |
5624 | * a jiffy. | |
5625 | * the system might be non-idle CPU-wise, but we only care | |
5626 | * about not overloading the IO subsystem. (things like an | |
5627 | * e2fsck being done on the RAID array should execute fast) | |
5628 | */ | |
2ad8b1ef | 5629 | blk_unplug(mddev->queue); |
1da177e4 LT |
5630 | cond_resched(); |
5631 | ||
57afd89f N |
5632 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
5633 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 5634 | |
88202a0c N |
5635 | if (currspeed > speed_min(mddev)) { |
5636 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 5637 | !is_mddev_idle(mddev)) { |
c0e48521 | 5638 | msleep(500); |
1da177e4 LT |
5639 | goto repeat; |
5640 | } | |
5641 | } | |
5642 | } | |
61df9d91 | 5643 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
5644 | /* |
5645 | * this also signals 'finished resyncing' to md_stop | |
5646 | */ | |
5647 | out: | |
2ad8b1ef | 5648 | blk_unplug(mddev->queue); |
1da177e4 LT |
5649 | |
5650 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
5651 | ||
5652 | /* tell personality that we are finished */ | |
57afd89f | 5653 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
5654 | |
5655 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
ccfcc3c1 | 5656 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
5657 | mddev->curr_resync > 2) { |
5658 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
5659 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5660 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
5661 | printk(KERN_INFO | |
61df9d91 N |
5662 | "md: checkpointing %s of %s.\n", |
5663 | desc, mdname(mddev)); | |
5fd6c1dc N |
5664 | mddev->recovery_cp = mddev->curr_resync; |
5665 | } | |
5666 | } else | |
5667 | mddev->recovery_cp = MaxSector; | |
5668 | } else { | |
5669 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5670 | mddev->curr_resync = MaxSector; | |
5671 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5672 | if (rdev->raid_disk >= 0 && | |
5673 | !test_bit(Faulty, &rdev->flags) && | |
5674 | !test_bit(In_sync, &rdev->flags) && | |
5675 | rdev->recovery_offset < mddev->curr_resync) | |
5676 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 5677 | } |
1da177e4 | 5678 | } |
17571284 | 5679 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5680 | |
1da177e4 LT |
5681 | skip: |
5682 | mddev->curr_resync = 0; | |
c6207277 N |
5683 | mddev->resync_max = MaxSector; |
5684 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
5685 | wake_up(&resync_wait); |
5686 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
5687 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
5688 | return; |
5689 | ||
5690 | interrupted: | |
5691 | /* | |
5692 | * got a signal, exit. | |
5693 | */ | |
5694 | printk(KERN_INFO | |
5695 | "md: md_do_sync() got signal ... exiting\n"); | |
5696 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5697 | goto out; | |
5698 | ||
1da177e4 | 5699 | } |
29269553 | 5700 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
5701 | |
5702 | ||
b4c4c7b8 N |
5703 | static int remove_and_add_spares(mddev_t *mddev) |
5704 | { | |
5705 | mdk_rdev_t *rdev; | |
5706 | struct list_head *rtmp; | |
5707 | int spares = 0; | |
5708 | ||
5709 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5710 | if (rdev->raid_disk >= 0 && | |
c303da6d | 5711 | !mddev->external && |
b4c4c7b8 N |
5712 | (test_bit(Faulty, &rdev->flags) || |
5713 | ! test_bit(In_sync, &rdev->flags)) && | |
5714 | atomic_read(&rdev->nr_pending)==0) { | |
5715 | if (mddev->pers->hot_remove_disk( | |
5716 | mddev, rdev->raid_disk)==0) { | |
5717 | char nm[20]; | |
5718 | sprintf(nm,"rd%d", rdev->raid_disk); | |
5719 | sysfs_remove_link(&mddev->kobj, nm); | |
5720 | rdev->raid_disk = -1; | |
5721 | } | |
5722 | } | |
5723 | ||
5724 | if (mddev->degraded) { | |
5725 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5726 | if (rdev->raid_disk < 0 | |
5727 | && !test_bit(Faulty, &rdev->flags)) { | |
5728 | rdev->recovery_offset = 0; | |
5729 | if (mddev->pers->hot_add_disk(mddev,rdev)) { | |
5730 | char nm[20]; | |
5731 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
5732 | if (sysfs_create_link(&mddev->kobj, |
5733 | &rdev->kobj, nm)) | |
5734 | printk(KERN_WARNING | |
5735 | "md: cannot register " | |
5736 | "%s for %s\n", | |
5737 | nm, mdname(mddev)); | |
b4c4c7b8 N |
5738 | spares++; |
5739 | md_new_event(mddev); | |
5740 | } else | |
5741 | break; | |
5742 | } | |
5743 | } | |
5744 | return spares; | |
5745 | } | |
1da177e4 LT |
5746 | /* |
5747 | * This routine is regularly called by all per-raid-array threads to | |
5748 | * deal with generic issues like resync and super-block update. | |
5749 | * Raid personalities that don't have a thread (linear/raid0) do not | |
5750 | * need this as they never do any recovery or update the superblock. | |
5751 | * | |
5752 | * It does not do any resync itself, but rather "forks" off other threads | |
5753 | * to do that as needed. | |
5754 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
5755 | * "->recovery" and create a thread at ->sync_thread. | |
5756 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
5757 | * and wakeups up this thread which will reap the thread and finish up. | |
5758 | * This thread also removes any faulty devices (with nr_pending == 0). | |
5759 | * | |
5760 | * The overall approach is: | |
5761 | * 1/ if the superblock needs updating, update it. | |
5762 | * 2/ If a recovery thread is running, don't do anything else. | |
5763 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
5764 | * 4/ If there are any faulty devices, remove them. | |
5765 | * 5/ If array is degraded, try to add spares devices | |
5766 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
5767 | */ | |
5768 | void md_check_recovery(mddev_t *mddev) | |
5769 | { | |
5770 | mdk_rdev_t *rdev; | |
5771 | struct list_head *rtmp; | |
5772 | ||
5773 | ||
5f40402d N |
5774 | if (mddev->bitmap) |
5775 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
5776 | |
5777 | if (mddev->ro) | |
5778 | return; | |
fca4d848 N |
5779 | |
5780 | if (signal_pending(current)) { | |
5781 | if (mddev->pers->sync_request) { | |
5782 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
5783 | mdname(mddev)); | |
5784 | mddev->safemode = 2; | |
5785 | } | |
5786 | flush_signals(current); | |
5787 | } | |
5788 | ||
1da177e4 | 5789 | if ( ! ( |
e691063a | 5790 | (mddev->flags && !mddev->external) || |
1da177e4 | 5791 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 N |
5792 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
5793 | (mddev->safemode == 1) || | |
5794 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
5795 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
5796 | )) |
5797 | return; | |
fca4d848 | 5798 | |
df5b89b3 | 5799 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 5800 | int spares = 0; |
fca4d848 | 5801 | |
a9701a30 | 5802 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
5803 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
5804 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
5805 | mddev->in_sync = 1; | |
e691063a N |
5806 | if (mddev->persistent) |
5807 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
fca4d848 N |
5808 | } |
5809 | if (mddev->safemode == 1) | |
5810 | mddev->safemode = 0; | |
a9701a30 | 5811 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 5812 | |
850b2b42 N |
5813 | if (mddev->flags) |
5814 | md_update_sb(mddev, 0); | |
06d91a5f | 5815 | |
06d91a5f | 5816 | |
1da177e4 LT |
5817 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
5818 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
5819 | /* resync/recovery still happening */ | |
5820 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5821 | goto unlock; | |
5822 | } | |
5823 | if (mddev->sync_thread) { | |
5824 | /* resync has finished, collect result */ | |
5825 | md_unregister_thread(mddev->sync_thread); | |
5826 | mddev->sync_thread = NULL; | |
5827 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
5828 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5829 | /* success...*/ | |
5830 | /* activate any spares */ | |
5831 | mddev->pers->spare_active(mddev); | |
5832 | } | |
850b2b42 | 5833 | md_update_sb(mddev, 1); |
41158c7e N |
5834 | |
5835 | /* if array is no-longer degraded, then any saved_raid_disk | |
5836 | * information must be scrapped | |
5837 | */ | |
5838 | if (!mddev->degraded) | |
5839 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5840 | rdev->saved_raid_disk = -1; | |
5841 | ||
1da177e4 LT |
5842 | mddev->recovery = 0; |
5843 | /* flag recovery needed just to double check */ | |
5844 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 5845 | md_new_event(mddev); |
1da177e4 LT |
5846 | goto unlock; |
5847 | } | |
24dd469d N |
5848 | /* Clear some bits that don't mean anything, but |
5849 | * might be left set | |
5850 | */ | |
5851 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5852 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5853 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5854 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 5855 | |
5fd6c1dc N |
5856 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
5857 | goto unlock; | |
1da177e4 LT |
5858 | /* no recovery is running. |
5859 | * remove any failed drives, then | |
5860 | * add spares if possible. | |
5861 | * Spare are also removed and re-added, to allow | |
5862 | * the personality to fail the re-add. | |
5863 | */ | |
1da177e4 | 5864 | |
b4c4c7b8 N |
5865 | if (mddev->reshape_position != MaxSector) { |
5866 | if (mddev->pers->check_reshape(mddev) != 0) | |
5867 | /* Cannot proceed */ | |
5868 | goto unlock; | |
5869 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5870 | } else if ((spares = remove_and_add_spares(mddev))) { | |
24dd469d N |
5871 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
5872 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5873 | } else if (mddev->recovery_cp < MaxSector) { | |
5874 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
5875 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5876 | /* nothing to be done ... */ | |
1da177e4 | 5877 | goto unlock; |
24dd469d | 5878 | |
1da177e4 LT |
5879 | if (mddev->pers->sync_request) { |
5880 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
5881 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
5882 | /* We are adding a device or devices to an array | |
5883 | * which has the bitmap stored on all devices. | |
5884 | * So make sure all bitmap pages get written | |
5885 | */ | |
5886 | bitmap_write_all(mddev->bitmap); | |
5887 | } | |
1da177e4 LT |
5888 | mddev->sync_thread = md_register_thread(md_do_sync, |
5889 | mddev, | |
5890 | "%s_resync"); | |
5891 | if (!mddev->sync_thread) { | |
5892 | printk(KERN_ERR "%s: could not start resync" | |
5893 | " thread...\n", | |
5894 | mdname(mddev)); | |
5895 | /* leave the spares where they are, it shouldn't hurt */ | |
5896 | mddev->recovery = 0; | |
d7603b7e | 5897 | } else |
1da177e4 | 5898 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 5899 | md_new_event(mddev); |
1da177e4 LT |
5900 | } |
5901 | unlock: | |
5902 | mddev_unlock(mddev); | |
5903 | } | |
5904 | } | |
5905 | ||
75c96f85 AB |
5906 | static int md_notify_reboot(struct notifier_block *this, |
5907 | unsigned long code, void *x) | |
1da177e4 LT |
5908 | { |
5909 | struct list_head *tmp; | |
5910 | mddev_t *mddev; | |
5911 | ||
5912 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
5913 | ||
5914 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
5915 | ||
29ac4aa3 | 5916 | for_each_mddev(mddev, tmp) |
c71d4887 | 5917 | if (mddev_trylock(mddev)) { |
1da177e4 | 5918 | do_md_stop (mddev, 1); |
c71d4887 NB |
5919 | mddev_unlock(mddev); |
5920 | } | |
1da177e4 LT |
5921 | /* |
5922 | * certain more exotic SCSI devices are known to be | |
5923 | * volatile wrt too early system reboots. While the | |
5924 | * right place to handle this issue is the given | |
5925 | * driver, we do want to have a safe RAID driver ... | |
5926 | */ | |
5927 | mdelay(1000*1); | |
5928 | } | |
5929 | return NOTIFY_DONE; | |
5930 | } | |
5931 | ||
75c96f85 | 5932 | static struct notifier_block md_notifier = { |
1da177e4 LT |
5933 | .notifier_call = md_notify_reboot, |
5934 | .next = NULL, | |
5935 | .priority = INT_MAX, /* before any real devices */ | |
5936 | }; | |
5937 | ||
5938 | static void md_geninit(void) | |
5939 | { | |
5940 | struct proc_dir_entry *p; | |
5941 | ||
5942 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
5943 | ||
5944 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
5945 | if (p) | |
5946 | p->proc_fops = &md_seq_fops; | |
5947 | } | |
5948 | ||
75c96f85 | 5949 | static int __init md_init(void) |
1da177e4 | 5950 | { |
1da177e4 LT |
5951 | if (register_blkdev(MAJOR_NR, "md")) |
5952 | return -1; | |
5953 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
5954 | unregister_blkdev(MAJOR_NR, "md"); | |
5955 | return -1; | |
5956 | } | |
e8703fe1 N |
5957 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
5958 | md_probe, NULL, NULL); | |
5959 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
5960 | md_probe, NULL, NULL); |
5961 | ||
1da177e4 | 5962 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 5963 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
5964 | |
5965 | md_geninit(); | |
5966 | return (0); | |
5967 | } | |
5968 | ||
5969 | ||
5970 | #ifndef MODULE | |
5971 | ||
5972 | /* | |
5973 | * Searches all registered partitions for autorun RAID arrays | |
5974 | * at boot time. | |
5975 | */ | |
4d936ec1 ME |
5976 | |
5977 | static LIST_HEAD(all_detected_devices); | |
5978 | struct detected_devices_node { | |
5979 | struct list_head list; | |
5980 | dev_t dev; | |
5981 | }; | |
1da177e4 LT |
5982 | |
5983 | void md_autodetect_dev(dev_t dev) | |
5984 | { | |
4d936ec1 ME |
5985 | struct detected_devices_node *node_detected_dev; |
5986 | ||
5987 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
5988 | if (node_detected_dev) { | |
5989 | node_detected_dev->dev = dev; | |
5990 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
5991 | } else { | |
5992 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
5993 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
5994 | } | |
1da177e4 LT |
5995 | } |
5996 | ||
5997 | ||
5998 | static void autostart_arrays(int part) | |
5999 | { | |
6000 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6001 | struct detected_devices_node *node_detected_dev; |
6002 | dev_t dev; | |
6003 | int i_scanned, i_passed; | |
1da177e4 | 6004 | |
4d936ec1 ME |
6005 | i_scanned = 0; |
6006 | i_passed = 0; | |
1da177e4 | 6007 | |
4d936ec1 | 6008 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6009 | |
4d936ec1 ME |
6010 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6011 | i_scanned++; | |
6012 | node_detected_dev = list_entry(all_detected_devices.next, | |
6013 | struct detected_devices_node, list); | |
6014 | list_del(&node_detected_dev->list); | |
6015 | dev = node_detected_dev->dev; | |
6016 | kfree(node_detected_dev); | |
df968c4e | 6017 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6018 | if (IS_ERR(rdev)) |
6019 | continue; | |
6020 | ||
b2d444d7 | 6021 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6022 | MD_BUG(); |
6023 | continue; | |
6024 | } | |
6025 | list_add(&rdev->same_set, &pending_raid_disks); | |
4d936ec1 | 6026 | i_passed++; |
1da177e4 | 6027 | } |
4d936ec1 ME |
6028 | |
6029 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6030 | i_scanned, i_passed); | |
1da177e4 LT |
6031 | |
6032 | autorun_devices(part); | |
6033 | } | |
6034 | ||
fdee8ae4 | 6035 | #endif /* !MODULE */ |
1da177e4 LT |
6036 | |
6037 | static __exit void md_exit(void) | |
6038 | { | |
6039 | mddev_t *mddev; | |
6040 | struct list_head *tmp; | |
8ab5e4c1 | 6041 | |
e8703fe1 N |
6042 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
6043 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
6044 | |
6045 | unregister_blkdev(MAJOR_NR,"md"); | |
6046 | unregister_blkdev(mdp_major, "mdp"); | |
6047 | unregister_reboot_notifier(&md_notifier); | |
6048 | unregister_sysctl_table(raid_table_header); | |
6049 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6050 | for_each_mddev(mddev, tmp) { |
1da177e4 LT |
6051 | struct gendisk *disk = mddev->gendisk; |
6052 | if (!disk) | |
6053 | continue; | |
6054 | export_array(mddev); | |
6055 | del_gendisk(disk); | |
6056 | put_disk(disk); | |
6057 | mddev->gendisk = NULL; | |
6058 | mddev_put(mddev); | |
6059 | } | |
6060 | } | |
6061 | ||
685784aa | 6062 | subsys_initcall(md_init); |
1da177e4 LT |
6063 | module_exit(md_exit) |
6064 | ||
f91de92e N |
6065 | static int get_ro(char *buffer, struct kernel_param *kp) |
6066 | { | |
6067 | return sprintf(buffer, "%d", start_readonly); | |
6068 | } | |
6069 | static int set_ro(const char *val, struct kernel_param *kp) | |
6070 | { | |
6071 | char *e; | |
6072 | int num = simple_strtoul(val, &e, 10); | |
6073 | if (*val && (*e == '\0' || *e == '\n')) { | |
6074 | start_readonly = num; | |
4dbcdc75 | 6075 | return 0; |
f91de92e N |
6076 | } |
6077 | return -EINVAL; | |
6078 | } | |
6079 | ||
80ca3a44 N |
6080 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6081 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6082 | |
f91de92e | 6083 | |
1da177e4 LT |
6084 | EXPORT_SYMBOL(register_md_personality); |
6085 | EXPORT_SYMBOL(unregister_md_personality); | |
6086 | EXPORT_SYMBOL(md_error); | |
6087 | EXPORT_SYMBOL(md_done_sync); | |
6088 | EXPORT_SYMBOL(md_write_start); | |
6089 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6090 | EXPORT_SYMBOL(md_register_thread); |
6091 | EXPORT_SYMBOL(md_unregister_thread); | |
6092 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6093 | EXPORT_SYMBOL(md_check_recovery); |
6094 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6095 | MODULE_ALIAS("md"); |
72008652 | 6096 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |