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