Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
50511da3 | 36 | #include <linux/kernel.h> |
a6fb0934 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
38 | #include <linux/linkage.h> |
39 | #include <linux/raid/md.h> | |
32a7627c | 40 | #include <linux/raid/bitmap.h> |
1da177e4 | 41 | #include <linux/sysctl.h> |
1da177e4 | 42 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 43 | #include <linux/poll.h> |
48c9c27b | 44 | #include <linux/mutex.h> |
16f17b39 | 45 | #include <linux/ctype.h> |
7dfb7103 | 46 | #include <linux/freezer.h> |
1da177e4 LT |
47 | |
48 | #include <linux/init.h> | |
49 | ||
32a7627c N |
50 | #include <linux/file.h> |
51 | ||
1da177e4 LT |
52 | #ifdef CONFIG_KMOD |
53 | #include <linux/kmod.h> | |
54 | #endif | |
55 | ||
56 | #include <asm/unaligned.h> | |
57 | ||
58 | #define MAJOR_NR MD_MAJOR | |
59 | #define MD_DRIVER | |
60 | ||
61 | /* 63 partitions with the alternate major number (mdp) */ | |
62 | #define MdpMinorShift 6 | |
63 | ||
64 | #define DEBUG 0 | |
65 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
66 | ||
67 | ||
68 | #ifndef MODULE | |
69 | static void autostart_arrays (int part); | |
70 | #endif | |
71 | ||
2604b703 | 72 | static LIST_HEAD(pers_list); |
1da177e4 LT |
73 | static DEFINE_SPINLOCK(pers_lock); |
74 | ||
5e56341d AB |
75 | static void md_print_devices(void); |
76 | ||
77 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } | |
78 | ||
1da177e4 LT |
79 | /* |
80 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
81 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
82 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 83 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
84 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
85 | * speed limit - in case reconstruction slows down your system despite | |
86 | * idle IO detection. | |
87 | * | |
88 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 89 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
90 | */ |
91 | ||
92 | static int sysctl_speed_limit_min = 1000; | |
93 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
94 | static inline int speed_min(mddev_t *mddev) |
95 | { | |
96 | return mddev->sync_speed_min ? | |
97 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
98 | } | |
99 | ||
100 | static inline int speed_max(mddev_t *mddev) | |
101 | { | |
102 | return mddev->sync_speed_max ? | |
103 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
104 | } | |
1da177e4 LT |
105 | |
106 | static struct ctl_table_header *raid_table_header; | |
107 | ||
108 | static ctl_table raid_table[] = { | |
109 | { | |
110 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
111 | .procname = "speed_limit_min", | |
112 | .data = &sysctl_speed_limit_min, | |
113 | .maxlen = sizeof(int), | |
80ca3a44 | 114 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
115 | .proc_handler = &proc_dointvec, |
116 | }, | |
117 | { | |
118 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
119 | .procname = "speed_limit_max", | |
120 | .data = &sysctl_speed_limit_max, | |
121 | .maxlen = sizeof(int), | |
80ca3a44 | 122 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
123 | .proc_handler = &proc_dointvec, |
124 | }, | |
125 | { .ctl_name = 0 } | |
126 | }; | |
127 | ||
128 | static ctl_table raid_dir_table[] = { | |
129 | { | |
130 | .ctl_name = DEV_RAID, | |
131 | .procname = "raid", | |
132 | .maxlen = 0, | |
80ca3a44 | 133 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
134 | .child = raid_table, |
135 | }, | |
136 | { .ctl_name = 0 } | |
137 | }; | |
138 | ||
139 | static ctl_table raid_root_table[] = { | |
140 | { | |
141 | .ctl_name = CTL_DEV, | |
142 | .procname = "dev", | |
143 | .maxlen = 0, | |
144 | .mode = 0555, | |
145 | .child = raid_dir_table, | |
146 | }, | |
147 | { .ctl_name = 0 } | |
148 | }; | |
149 | ||
150 | static struct block_device_operations md_fops; | |
151 | ||
f91de92e N |
152 | static int start_readonly; |
153 | ||
d7603b7e N |
154 | /* |
155 | * We have a system wide 'event count' that is incremented | |
156 | * on any 'interesting' event, and readers of /proc/mdstat | |
157 | * can use 'poll' or 'select' to find out when the event | |
158 | * count increases. | |
159 | * | |
160 | * Events are: | |
161 | * start array, stop array, error, add device, remove device, | |
162 | * start build, activate spare | |
163 | */ | |
2989ddbd | 164 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 165 | static atomic_t md_event_count; |
29269553 | 166 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
167 | { |
168 | atomic_inc(&md_event_count); | |
169 | wake_up(&md_event_waiters); | |
4508a7a7 | 170 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
d7603b7e | 171 | } |
29269553 | 172 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 173 | |
c331eb04 N |
174 | /* Alternate version that can be called from interrupts |
175 | * when calling sysfs_notify isn't needed. | |
176 | */ | |
05381954 | 177 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
178 | { |
179 | atomic_inc(&md_event_count); | |
180 | wake_up(&md_event_waiters); | |
181 | } | |
182 | ||
1da177e4 LT |
183 | /* |
184 | * Enables to iterate over all existing md arrays | |
185 | * all_mddevs_lock protects this list. | |
186 | */ | |
187 | static LIST_HEAD(all_mddevs); | |
188 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
189 | ||
190 | ||
191 | /* | |
192 | * iterates through all used mddevs in the system. | |
193 | * We take care to grab the all_mddevs_lock whenever navigating | |
194 | * the list, and to always hold a refcount when unlocked. | |
195 | * Any code which breaks out of this loop while own | |
196 | * a reference to the current mddev and must mddev_put it. | |
197 | */ | |
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 | ||
214 | static int md_fail_request (request_queue_t *q, struct bio *bio) | |
215 | { | |
216 | bio_io_error(bio, bio->bi_size); | |
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); |
eae1701f | 234 | kobject_unregister(&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 | ||
7bfa19f2 N |
387 | static int super_written(struct bio *bio, unsigned int bytes_done, int error) |
388 | { | |
389 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 390 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 N |
391 | if (bio->bi_size) |
392 | return 1; | |
393 | ||
3a0f5bbb N |
394 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
395 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
396 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
397 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 398 | md_error(mddev, rdev); |
3a0f5bbb | 399 | } |
7bfa19f2 | 400 | |
a9701a30 N |
401 | if (atomic_dec_and_test(&mddev->pending_writes)) |
402 | wake_up(&mddev->sb_wait); | |
f8b58edf | 403 | bio_put(bio); |
7bfa19f2 N |
404 | return 0; |
405 | } | |
406 | ||
a9701a30 N |
407 | static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) |
408 | { | |
409 | struct bio *bio2 = bio->bi_private; | |
410 | mdk_rdev_t *rdev = bio2->bi_private; | |
411 | mddev_t *mddev = rdev->mddev; | |
412 | if (bio->bi_size) | |
413 | return 1; | |
414 | ||
415 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
416 | error == -EOPNOTSUPP) { | |
417 | unsigned long flags; | |
418 | /* barriers don't appear to be supported :-( */ | |
419 | set_bit(BarriersNotsupp, &rdev->flags); | |
420 | mddev->barriers_work = 0; | |
421 | spin_lock_irqsave(&mddev->write_lock, flags); | |
422 | bio2->bi_next = mddev->biolist; | |
423 | mddev->biolist = bio2; | |
424 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
425 | wake_up(&mddev->sb_wait); | |
426 | bio_put(bio); | |
427 | return 0; | |
428 | } | |
429 | bio_put(bio2); | |
430 | bio->bi_private = rdev; | |
431 | return super_written(bio, bytes_done, error); | |
432 | } | |
433 | ||
7bfa19f2 N |
434 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
435 | sector_t sector, int size, struct page *page) | |
436 | { | |
437 | /* write first size bytes of page to sector of rdev | |
438 | * Increment mddev->pending_writes before returning | |
439 | * and decrement it on completion, waking up sb_wait | |
440 | * if zero is reached. | |
441 | * If an error occurred, call md_error | |
a9701a30 N |
442 | * |
443 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
444 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
445 | */ |
446 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 447 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
448 | |
449 | bio->bi_bdev = rdev->bdev; | |
450 | bio->bi_sector = sector; | |
451 | bio_add_page(bio, page, size, 0); | |
452 | bio->bi_private = rdev; | |
453 | bio->bi_end_io = super_written; | |
a9701a30 N |
454 | bio->bi_rw = rw; |
455 | ||
7bfa19f2 | 456 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
457 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
458 | struct bio *rbio; | |
459 | rw |= (1<<BIO_RW_BARRIER); | |
460 | rbio = bio_clone(bio, GFP_NOIO); | |
461 | rbio->bi_private = bio; | |
462 | rbio->bi_end_io = super_written_barrier; | |
463 | submit_bio(rw, rbio); | |
464 | } else | |
465 | submit_bio(rw, bio); | |
466 | } | |
467 | ||
468 | void md_super_wait(mddev_t *mddev) | |
469 | { | |
470 | /* wait for all superblock writes that were scheduled to complete. | |
471 | * if any had to be retried (due to BARRIER problems), retry them | |
472 | */ | |
473 | DEFINE_WAIT(wq); | |
474 | for(;;) { | |
475 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
476 | if (atomic_read(&mddev->pending_writes)==0) | |
477 | break; | |
478 | while (mddev->biolist) { | |
479 | struct bio *bio; | |
480 | spin_lock_irq(&mddev->write_lock); | |
481 | bio = mddev->biolist; | |
482 | mddev->biolist = bio->bi_next ; | |
483 | bio->bi_next = NULL; | |
484 | spin_unlock_irq(&mddev->write_lock); | |
485 | submit_bio(bio->bi_rw, bio); | |
486 | } | |
487 | schedule(); | |
488 | } | |
489 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
490 | } |
491 | ||
1da177e4 LT |
492 | static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) |
493 | { | |
494 | if (bio->bi_size) | |
495 | return 1; | |
496 | ||
497 | complete((struct completion*)bio->bi_private); | |
498 | return 0; | |
499 | } | |
500 | ||
a654b9d8 | 501 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
502 | struct page *page, int rw) |
503 | { | |
baaa2c51 | 504 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
505 | struct completion event; |
506 | int ret; | |
507 | ||
508 | rw |= (1 << BIO_RW_SYNC); | |
509 | ||
510 | bio->bi_bdev = bdev; | |
511 | bio->bi_sector = sector; | |
512 | bio_add_page(bio, page, size, 0); | |
513 | init_completion(&event); | |
514 | bio->bi_private = &event; | |
515 | bio->bi_end_io = bi_complete; | |
516 | submit_bio(rw, bio); | |
517 | wait_for_completion(&event); | |
518 | ||
519 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
520 | bio_put(bio); | |
521 | return ret; | |
522 | } | |
a8745db2 | 523 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 524 | |
0002b271 | 525 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
526 | { |
527 | char b[BDEVNAME_SIZE]; | |
528 | if (!rdev->sb_page) { | |
529 | MD_BUG(); | |
530 | return -EINVAL; | |
531 | } | |
532 | if (rdev->sb_loaded) | |
533 | return 0; | |
534 | ||
535 | ||
0002b271 | 536 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
537 | goto fail; |
538 | rdev->sb_loaded = 1; | |
539 | return 0; | |
540 | ||
541 | fail: | |
542 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
543 | bdevname(rdev->bdev,b)); | |
544 | return -EINVAL; | |
545 | } | |
546 | ||
547 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
548 | { | |
549 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
550 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
551 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
552 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
553 | ||
554 | return 1; | |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
559 | ||
560 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
561 | { | |
562 | int ret; | |
563 | mdp_super_t *tmp1, *tmp2; | |
564 | ||
565 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
566 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
567 | ||
568 | if (!tmp1 || !tmp2) { | |
569 | ret = 0; | |
570 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
571 | goto abort; | |
572 | } | |
573 | ||
574 | *tmp1 = *sb1; | |
575 | *tmp2 = *sb2; | |
576 | ||
577 | /* | |
578 | * nr_disks is not constant | |
579 | */ | |
580 | tmp1->nr_disks = 0; | |
581 | tmp2->nr_disks = 0; | |
582 | ||
583 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
584 | ret = 0; | |
585 | else | |
586 | ret = 1; | |
587 | ||
588 | abort: | |
990a8baf JJ |
589 | kfree(tmp1); |
590 | kfree(tmp2); | |
1da177e4 LT |
591 | return ret; |
592 | } | |
593 | ||
4d167f09 N |
594 | |
595 | static u32 md_csum_fold(u32 csum) | |
596 | { | |
597 | csum = (csum & 0xffff) + (csum >> 16); | |
598 | return (csum & 0xffff) + (csum >> 16); | |
599 | } | |
600 | ||
1da177e4 LT |
601 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
602 | { | |
4d167f09 N |
603 | u64 newcsum = 0; |
604 | u32 *sb32 = (u32*)sb; | |
605 | int i; | |
1da177e4 LT |
606 | unsigned int disk_csum, csum; |
607 | ||
608 | disk_csum = sb->sb_csum; | |
609 | sb->sb_csum = 0; | |
4d167f09 N |
610 | |
611 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
612 | newcsum += sb32[i]; | |
613 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
614 | ||
615 | ||
616 | #ifdef CONFIG_ALPHA | |
617 | /* This used to use csum_partial, which was wrong for several | |
618 | * reasons including that different results are returned on | |
619 | * different architectures. It isn't critical that we get exactly | |
620 | * the same return value as before (we always csum_fold before | |
621 | * testing, and that removes any differences). However as we | |
622 | * know that csum_partial always returned a 16bit value on | |
623 | * alphas, do a fold to maximise conformity to previous behaviour. | |
624 | */ | |
625 | sb->sb_csum = md_csum_fold(disk_csum); | |
626 | #else | |
1da177e4 | 627 | sb->sb_csum = disk_csum; |
4d167f09 | 628 | #endif |
1da177e4 LT |
629 | return csum; |
630 | } | |
631 | ||
632 | ||
633 | /* | |
634 | * Handle superblock details. | |
635 | * We want to be able to handle multiple superblock formats | |
636 | * so we have a common interface to them all, and an array of | |
637 | * different handlers. | |
638 | * We rely on user-space to write the initial superblock, and support | |
639 | * reading and updating of superblocks. | |
640 | * Interface methods are: | |
641 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
642 | * loads and validates a superblock on dev. | |
643 | * if refdev != NULL, compare superblocks on both devices | |
644 | * Return: | |
645 | * 0 - dev has a superblock that is compatible with refdev | |
646 | * 1 - dev has a superblock that is compatible and newer than refdev | |
647 | * so dev should be used as the refdev in future | |
648 | * -EINVAL superblock incompatible or invalid | |
649 | * -othererror e.g. -EIO | |
650 | * | |
651 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
652 | * Verify that dev is acceptable into mddev. | |
653 | * The first time, mddev->raid_disks will be 0, and data from | |
654 | * dev should be merged in. Subsequent calls check that dev | |
655 | * is new enough. Return 0 or -EINVAL | |
656 | * | |
657 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
658 | * Update the superblock for rdev with data in mddev | |
659 | * This does not write to disc. | |
660 | * | |
661 | */ | |
662 | ||
663 | struct super_type { | |
664 | char *name; | |
665 | struct module *owner; | |
666 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
667 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
668 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
669 | }; | |
670 | ||
671 | /* | |
672 | * load_super for 0.90.0 | |
673 | */ | |
674 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
675 | { | |
676 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
677 | mdp_super_t *sb; | |
678 | int ret; | |
679 | sector_t sb_offset; | |
680 | ||
681 | /* | |
682 | * Calculate the position of the superblock, | |
683 | * it's at the end of the disk. | |
684 | * | |
685 | * It also happens to be a multiple of 4Kb. | |
686 | */ | |
687 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
688 | rdev->sb_offset = sb_offset; | |
689 | ||
0002b271 | 690 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
691 | if (ret) return ret; |
692 | ||
693 | ret = -EINVAL; | |
694 | ||
695 | bdevname(rdev->bdev, b); | |
696 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
697 | ||
698 | if (sb->md_magic != MD_SB_MAGIC) { | |
699 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
700 | b); | |
701 | goto abort; | |
702 | } | |
703 | ||
704 | if (sb->major_version != 0 || | |
f6705578 N |
705 | sb->minor_version < 90 || |
706 | sb->minor_version > 91) { | |
1da177e4 LT |
707 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
708 | sb->major_version, sb->minor_version, | |
709 | b); | |
710 | goto abort; | |
711 | } | |
712 | ||
713 | if (sb->raid_disks <= 0) | |
714 | goto abort; | |
715 | ||
4d167f09 | 716 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
717 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
718 | b); | |
719 | goto abort; | |
720 | } | |
721 | ||
722 | rdev->preferred_minor = sb->md_minor; | |
723 | rdev->data_offset = 0; | |
0002b271 | 724 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 725 | |
e11e93fa N |
726 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
727 | if (sb->level != 1 && sb->level != 4 | |
728 | && sb->level != 5 && sb->level != 6 | |
729 | && sb->level != 10) { | |
730 | /* FIXME use a better test */ | |
731 | printk(KERN_WARNING | |
732 | "md: bitmaps not supported for this level.\n"); | |
733 | goto abort; | |
734 | } | |
735 | } | |
736 | ||
1da177e4 LT |
737 | if (sb->level == LEVEL_MULTIPATH) |
738 | rdev->desc_nr = -1; | |
739 | else | |
740 | rdev->desc_nr = sb->this_disk.number; | |
741 | ||
742 | if (refdev == 0) | |
743 | ret = 1; | |
744 | else { | |
745 | __u64 ev1, ev2; | |
746 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
747 | if (!uuid_equal(refsb, sb)) { | |
748 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
749 | b, bdevname(refdev->bdev,b2)); | |
750 | goto abort; | |
751 | } | |
752 | if (!sb_equal(refsb, sb)) { | |
753 | printk(KERN_WARNING "md: %s has same UUID" | |
754 | " but different superblock to %s\n", | |
755 | b, bdevname(refdev->bdev, b2)); | |
756 | goto abort; | |
757 | } | |
758 | ev1 = md_event(sb); | |
759 | ev2 = md_event(refsb); | |
760 | if (ev1 > ev2) | |
761 | ret = 1; | |
762 | else | |
763 | ret = 0; | |
764 | } | |
765 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
766 | ||
2bf071bf N |
767 | if (rdev->size < sb->size && sb->level > 1) |
768 | /* "this cannot possibly happen" ... */ | |
769 | ret = -EINVAL; | |
770 | ||
1da177e4 LT |
771 | abort: |
772 | return ret; | |
773 | } | |
774 | ||
775 | /* | |
776 | * validate_super for 0.90.0 | |
777 | */ | |
778 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
779 | { | |
780 | mdp_disk_t *desc; | |
781 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 782 | __u64 ev1 = md_event(sb); |
1da177e4 | 783 | |
41158c7e | 784 | rdev->raid_disk = -1; |
b2d444d7 | 785 | rdev->flags = 0; |
1da177e4 LT |
786 | if (mddev->raid_disks == 0) { |
787 | mddev->major_version = 0; | |
788 | mddev->minor_version = sb->minor_version; | |
789 | mddev->patch_version = sb->patch_version; | |
790 | mddev->persistent = ! sb->not_persistent; | |
791 | mddev->chunk_size = sb->chunk_size; | |
792 | mddev->ctime = sb->ctime; | |
793 | mddev->utime = sb->utime; | |
794 | mddev->level = sb->level; | |
d9d166c2 | 795 | mddev->clevel[0] = 0; |
1da177e4 LT |
796 | mddev->layout = sb->layout; |
797 | mddev->raid_disks = sb->raid_disks; | |
798 | mddev->size = sb->size; | |
07d84d10 | 799 | mddev->events = ev1; |
9223214e | 800 | mddev->bitmap_offset = 0; |
36fa3063 | 801 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 802 | |
f6705578 N |
803 | if (mddev->minor_version >= 91) { |
804 | mddev->reshape_position = sb->reshape_position; | |
805 | mddev->delta_disks = sb->delta_disks; | |
806 | mddev->new_level = sb->new_level; | |
807 | mddev->new_layout = sb->new_layout; | |
808 | mddev->new_chunk = sb->new_chunk; | |
809 | } else { | |
810 | mddev->reshape_position = MaxSector; | |
811 | mddev->delta_disks = 0; | |
812 | mddev->new_level = mddev->level; | |
813 | mddev->new_layout = mddev->layout; | |
814 | mddev->new_chunk = mddev->chunk_size; | |
815 | } | |
816 | ||
1da177e4 LT |
817 | if (sb->state & (1<<MD_SB_CLEAN)) |
818 | mddev->recovery_cp = MaxSector; | |
819 | else { | |
820 | if (sb->events_hi == sb->cp_events_hi && | |
821 | sb->events_lo == sb->cp_events_lo) { | |
822 | mddev->recovery_cp = sb->recovery_cp; | |
823 | } else | |
824 | mddev->recovery_cp = 0; | |
825 | } | |
826 | ||
827 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
828 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
829 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
830 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
831 | ||
832 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
833 | |
834 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 835 | mddev->bitmap_file == NULL) |
36fa3063 | 836 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 837 | |
41158c7e N |
838 | } else if (mddev->pers == NULL) { |
839 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
840 | ++ev1; |
841 | if (ev1 < mddev->events) | |
842 | return -EINVAL; | |
41158c7e N |
843 | } else if (mddev->bitmap) { |
844 | /* if adding to array with a bitmap, then we can accept an | |
845 | * older device ... but not too old. | |
846 | */ | |
41158c7e N |
847 | if (ev1 < mddev->bitmap->events_cleared) |
848 | return 0; | |
07d84d10 N |
849 | } else { |
850 | if (ev1 < mddev->events) | |
851 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
852 | return 0; | |
853 | } | |
41158c7e | 854 | |
1da177e4 | 855 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
856 | desc = sb->disks + rdev->desc_nr; |
857 | ||
858 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 859 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
860 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
861 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 862 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
863 | rdev->raid_disk = desc->raid_disk; |
864 | } | |
8ddf9efe N |
865 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
866 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 867 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 868 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
869 | return 0; |
870 | } | |
871 | ||
872 | /* | |
873 | * sync_super for 0.90.0 | |
874 | */ | |
875 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
876 | { | |
877 | mdp_super_t *sb; | |
878 | struct list_head *tmp; | |
879 | mdk_rdev_t *rdev2; | |
880 | int next_spare = mddev->raid_disks; | |
19133a42 | 881 | |
1da177e4 LT |
882 | |
883 | /* make rdev->sb match mddev data.. | |
884 | * | |
885 | * 1/ zero out disks | |
886 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
887 | * 3/ any empty disks < next_spare become removed | |
888 | * | |
889 | * disks[0] gets initialised to REMOVED because | |
890 | * we cannot be sure from other fields if it has | |
891 | * been initialised or not. | |
892 | */ | |
893 | int i; | |
894 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
895 | ||
61181565 N |
896 | rdev->sb_size = MD_SB_BYTES; |
897 | ||
1da177e4 LT |
898 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
899 | ||
900 | memset(sb, 0, sizeof(*sb)); | |
901 | ||
902 | sb->md_magic = MD_SB_MAGIC; | |
903 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
904 | sb->patch_version = mddev->patch_version; |
905 | sb->gvalid_words = 0; /* ignored */ | |
906 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
907 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
908 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
909 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
910 | ||
911 | sb->ctime = mddev->ctime; | |
912 | sb->level = mddev->level; | |
913 | sb->size = mddev->size; | |
914 | sb->raid_disks = mddev->raid_disks; | |
915 | sb->md_minor = mddev->md_minor; | |
916 | sb->not_persistent = !mddev->persistent; | |
917 | sb->utime = mddev->utime; | |
918 | sb->state = 0; | |
919 | sb->events_hi = (mddev->events>>32); | |
920 | sb->events_lo = (u32)mddev->events; | |
921 | ||
f6705578 N |
922 | if (mddev->reshape_position == MaxSector) |
923 | sb->minor_version = 90; | |
924 | else { | |
925 | sb->minor_version = 91; | |
926 | sb->reshape_position = mddev->reshape_position; | |
927 | sb->new_level = mddev->new_level; | |
928 | sb->delta_disks = mddev->delta_disks; | |
929 | sb->new_layout = mddev->new_layout; | |
930 | sb->new_chunk = mddev->new_chunk; | |
931 | } | |
932 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
933 | if (mddev->in_sync) |
934 | { | |
935 | sb->recovery_cp = mddev->recovery_cp; | |
936 | sb->cp_events_hi = (mddev->events>>32); | |
937 | sb->cp_events_lo = (u32)mddev->events; | |
938 | if (mddev->recovery_cp == MaxSector) | |
939 | sb->state = (1<< MD_SB_CLEAN); | |
940 | } else | |
941 | sb->recovery_cp = 0; | |
942 | ||
943 | sb->layout = mddev->layout; | |
944 | sb->chunk_size = mddev->chunk_size; | |
945 | ||
a654b9d8 N |
946 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
947 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
948 | ||
1da177e4 LT |
949 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
950 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
951 | mdp_disk_t *d; | |
86e6ffdd | 952 | int desc_nr; |
b2d444d7 N |
953 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
954 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 955 | desc_nr = rdev2->raid_disk; |
1da177e4 | 956 | else |
86e6ffdd | 957 | desc_nr = next_spare++; |
19133a42 | 958 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
959 | d = &sb->disks[rdev2->desc_nr]; |
960 | nr_disks++; | |
961 | d->number = rdev2->desc_nr; | |
962 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
963 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
964 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
965 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
966 | d->raid_disk = rdev2->raid_disk; |
967 | else | |
968 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 969 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 970 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 971 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
972 | d->state = (1<<MD_DISK_ACTIVE); |
973 | d->state |= (1<<MD_DISK_SYNC); | |
974 | active++; | |
975 | working++; | |
976 | } else { | |
977 | d->state = 0; | |
978 | spare++; | |
979 | working++; | |
980 | } | |
8ddf9efe N |
981 | if (test_bit(WriteMostly, &rdev2->flags)) |
982 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 983 | } |
1da177e4 LT |
984 | /* now set the "removed" and "faulty" bits on any missing devices */ |
985 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
986 | mdp_disk_t *d = &sb->disks[i]; | |
987 | if (d->state == 0 && d->number == 0) { | |
988 | d->number = i; | |
989 | d->raid_disk = i; | |
990 | d->state = (1<<MD_DISK_REMOVED); | |
991 | d->state |= (1<<MD_DISK_FAULTY); | |
992 | failed++; | |
993 | } | |
994 | } | |
995 | sb->nr_disks = nr_disks; | |
996 | sb->active_disks = active; | |
997 | sb->working_disks = working; | |
998 | sb->failed_disks = failed; | |
999 | sb->spare_disks = spare; | |
1000 | ||
1001 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1002 | sb->sb_csum = calc_sb_csum(sb); | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * version 1 superblock | |
1007 | */ | |
1008 | ||
1c05b4bc | 1009 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1010 | { |
1c05b4bc N |
1011 | __le32 disk_csum; |
1012 | u32 csum; | |
1da177e4 LT |
1013 | unsigned long long newcsum; |
1014 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1015 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1016 | int i; |
1017 | ||
1018 | disk_csum = sb->sb_csum; | |
1019 | sb->sb_csum = 0; | |
1020 | newcsum = 0; | |
1021 | for (i=0; size>=4; size -= 4 ) | |
1022 | newcsum += le32_to_cpu(*isuper++); | |
1023 | ||
1024 | if (size == 2) | |
1c05b4bc | 1025 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1026 | |
1027 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1028 | sb->sb_csum = disk_csum; | |
1029 | return cpu_to_le32(csum); | |
1030 | } | |
1031 | ||
1032 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1033 | { | |
1034 | struct mdp_superblock_1 *sb; | |
1035 | int ret; | |
1036 | sector_t sb_offset; | |
1037 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 1038 | int bmask; |
1da177e4 LT |
1039 | |
1040 | /* | |
1041 | * Calculate the position of the superblock. | |
1042 | * It is always aligned to a 4K boundary and | |
1043 | * depeding on minor_version, it can be: | |
1044 | * 0: At least 8K, but less than 12K, from end of device | |
1045 | * 1: At start of device | |
1046 | * 2: 4K from start of device. | |
1047 | */ | |
1048 | switch(minor_version) { | |
1049 | case 0: | |
1050 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
1051 | sb_offset -= 8*2; | |
39730960 | 1052 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
1053 | /* convert from sectors to K */ |
1054 | sb_offset /= 2; | |
1055 | break; | |
1056 | case 1: | |
1057 | sb_offset = 0; | |
1058 | break; | |
1059 | case 2: | |
1060 | sb_offset = 4; | |
1061 | break; | |
1062 | default: | |
1063 | return -EINVAL; | |
1064 | } | |
1065 | rdev->sb_offset = sb_offset; | |
1066 | ||
0002b271 N |
1067 | /* superblock is rarely larger than 1K, but it can be larger, |
1068 | * and it is safe to read 4k, so we do that | |
1069 | */ | |
1070 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1071 | if (ret) return ret; |
1072 | ||
1073 | ||
1074 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1075 | ||
1076 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1077 | sb->major_version != cpu_to_le32(1) || | |
1078 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
1079 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 1080 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1081 | return -EINVAL; |
1082 | ||
1083 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1084 | printk("md: invalid superblock checksum on %s\n", | |
1085 | bdevname(rdev->bdev,b)); | |
1086 | return -EINVAL; | |
1087 | } | |
1088 | if (le64_to_cpu(sb->data_size) < 10) { | |
1089 | printk("md: data_size too small on %s\n", | |
1090 | bdevname(rdev->bdev,b)); | |
1091 | return -EINVAL; | |
1092 | } | |
e11e93fa N |
1093 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1094 | if (sb->level != cpu_to_le32(1) && | |
1095 | sb->level != cpu_to_le32(4) && | |
1096 | sb->level != cpu_to_le32(5) && | |
1097 | sb->level != cpu_to_le32(6) && | |
1098 | sb->level != cpu_to_le32(10)) { | |
1099 | printk(KERN_WARNING | |
1100 | "md: bitmaps not supported for this level.\n"); | |
1101 | return -EINVAL; | |
1102 | } | |
1103 | } | |
1104 | ||
1da177e4 LT |
1105 | rdev->preferred_minor = 0xffff; |
1106 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1107 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1108 | |
0002b271 | 1109 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1110 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
1111 | if (rdev->sb_size & bmask) |
1112 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
1113 | ||
31b65a0d N |
1114 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1115 | rdev->desc_nr = -1; | |
1116 | else | |
1117 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1118 | ||
1da177e4 | 1119 | if (refdev == 0) |
8ed75463 | 1120 | ret = 1; |
1da177e4 LT |
1121 | else { |
1122 | __u64 ev1, ev2; | |
1123 | struct mdp_superblock_1 *refsb = | |
1124 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1125 | ||
1126 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1127 | sb->level != refsb->level || | |
1128 | sb->layout != refsb->layout || | |
1129 | sb->chunksize != refsb->chunksize) { | |
1130 | printk(KERN_WARNING "md: %s has strangely different" | |
1131 | " superblock to %s\n", | |
1132 | bdevname(rdev->bdev,b), | |
1133 | bdevname(refdev->bdev,b2)); | |
1134 | return -EINVAL; | |
1135 | } | |
1136 | ev1 = le64_to_cpu(sb->events); | |
1137 | ev2 = le64_to_cpu(refsb->events); | |
1138 | ||
1139 | if (ev1 > ev2) | |
8ed75463 N |
1140 | ret = 1; |
1141 | else | |
1142 | ret = 0; | |
1da177e4 LT |
1143 | } |
1144 | if (minor_version) | |
1145 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1146 | else | |
1147 | rdev->size = rdev->sb_offset; | |
1148 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1149 | return -EINVAL; | |
1150 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1151 | if (le32_to_cpu(sb->chunksize)) | |
1152 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1153 | |
1c05b4bc | 1154 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1155 | return -EINVAL; |
8ed75463 | 1156 | return ret; |
1da177e4 LT |
1157 | } |
1158 | ||
1159 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1160 | { | |
1161 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1162 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1163 | |
41158c7e | 1164 | rdev->raid_disk = -1; |
b2d444d7 | 1165 | rdev->flags = 0; |
1da177e4 LT |
1166 | if (mddev->raid_disks == 0) { |
1167 | mddev->major_version = 1; | |
1168 | mddev->patch_version = 0; | |
1169 | mddev->persistent = 1; | |
1170 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
1171 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1172 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1173 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1174 | mddev->clevel[0] = 0; |
1da177e4 LT |
1175 | mddev->layout = le32_to_cpu(sb->layout); |
1176 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1177 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1178 | mddev->events = ev1; |
9223214e | 1179 | mddev->bitmap_offset = 0; |
29fc7e3e | 1180 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1181 | |
1182 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1183 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1184 | ||
1185 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1186 | |
71c0805c | 1187 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1188 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1189 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1190 | |
f6705578 N |
1191 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1192 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1193 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1194 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1195 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1196 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1197 | } else { | |
1198 | mddev->reshape_position = MaxSector; | |
1199 | mddev->delta_disks = 0; | |
1200 | mddev->new_level = mddev->level; | |
1201 | mddev->new_layout = mddev->layout; | |
1202 | mddev->new_chunk = mddev->chunk_size; | |
1203 | } | |
1204 | ||
41158c7e N |
1205 | } else if (mddev->pers == NULL) { |
1206 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1207 | ++ev1; |
1208 | if (ev1 < mddev->events) | |
1209 | return -EINVAL; | |
41158c7e N |
1210 | } else if (mddev->bitmap) { |
1211 | /* If adding to array with a bitmap, then we can accept an | |
1212 | * older device, but not too old. | |
1213 | */ | |
41158c7e N |
1214 | if (ev1 < mddev->bitmap->events_cleared) |
1215 | return 0; | |
07d84d10 N |
1216 | } else { |
1217 | if (ev1 < mddev->events) | |
1218 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1219 | return 0; | |
1220 | } | |
1da177e4 LT |
1221 | if (mddev->level != LEVEL_MULTIPATH) { |
1222 | int role; | |
1da177e4 LT |
1223 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1224 | switch(role) { | |
1225 | case 0xffff: /* spare */ | |
1da177e4 LT |
1226 | break; |
1227 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1228 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1229 | break; |
1230 | default: | |
5fd6c1dc N |
1231 | if ((le32_to_cpu(sb->feature_map) & |
1232 | MD_FEATURE_RECOVERY_OFFSET)) | |
1233 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1234 | else | |
1235 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1236 | rdev->raid_disk = role; |
1237 | break; | |
1238 | } | |
8ddf9efe N |
1239 | if (sb->devflags & WriteMostly1) |
1240 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1241 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1242 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1243 | |
1da177e4 LT |
1244 | return 0; |
1245 | } | |
1246 | ||
1247 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1248 | { | |
1249 | struct mdp_superblock_1 *sb; | |
1250 | struct list_head *tmp; | |
1251 | mdk_rdev_t *rdev2; | |
1252 | int max_dev, i; | |
1253 | /* make rdev->sb match mddev and rdev data. */ | |
1254 | ||
1255 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1256 | ||
1257 | sb->feature_map = 0; | |
1258 | sb->pad0 = 0; | |
5fd6c1dc | 1259 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1260 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1261 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1262 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1263 | ||
1264 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1265 | sb->events = cpu_to_le64(mddev->events); | |
1266 | if (mddev->in_sync) | |
1267 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1268 | else | |
1269 | sb->resync_offset = cpu_to_le64(0); | |
1270 | ||
1c05b4bc | 1271 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1272 | |
f0ca340c | 1273 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1274 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1275 | |
a654b9d8 N |
1276 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1277 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1278 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1279 | } |
5fd6c1dc N |
1280 | |
1281 | if (rdev->raid_disk >= 0 && | |
1282 | !test_bit(In_sync, &rdev->flags) && | |
1283 | rdev->recovery_offset > 0) { | |
1284 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1285 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1286 | } | |
1287 | ||
f6705578 N |
1288 | if (mddev->reshape_position != MaxSector) { |
1289 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1290 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1291 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1292 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1293 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1294 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1295 | } | |
a654b9d8 | 1296 | |
1da177e4 LT |
1297 | max_dev = 0; |
1298 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1299 | if (rdev2->desc_nr+1 > max_dev) | |
1300 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1301 | |
1302 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1303 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1304 | for (i=0; i<max_dev;i++) |
1305 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1306 | ||
1307 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1308 | i = rdev2->desc_nr; | |
b2d444d7 | 1309 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1310 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1311 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1312 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1313 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1314 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1315 | else |
1316 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1317 | } | |
1318 | ||
1da177e4 LT |
1319 | sb->sb_csum = calc_sb_1_csum(sb); |
1320 | } | |
1321 | ||
1322 | ||
75c96f85 | 1323 | static struct super_type super_types[] = { |
1da177e4 LT |
1324 | [0] = { |
1325 | .name = "0.90.0", | |
1326 | .owner = THIS_MODULE, | |
1327 | .load_super = super_90_load, | |
1328 | .validate_super = super_90_validate, | |
1329 | .sync_super = super_90_sync, | |
1330 | }, | |
1331 | [1] = { | |
1332 | .name = "md-1", | |
1333 | .owner = THIS_MODULE, | |
1334 | .load_super = super_1_load, | |
1335 | .validate_super = super_1_validate, | |
1336 | .sync_super = super_1_sync, | |
1337 | }, | |
1338 | }; | |
1da177e4 LT |
1339 | |
1340 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1341 | { | |
7dd5e7c3 N |
1342 | struct list_head *tmp, *tmp2; |
1343 | mdk_rdev_t *rdev, *rdev2; | |
1da177e4 LT |
1344 | |
1345 | ITERATE_RDEV(mddev1,rdev,tmp) | |
7dd5e7c3 N |
1346 | ITERATE_RDEV(mddev2, rdev2, tmp2) |
1347 | if (rdev->bdev->bd_contains == | |
1348 | rdev2->bdev->bd_contains) | |
1349 | return 1; | |
1da177e4 LT |
1350 | |
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | static LIST_HEAD(pending_raid_disks); | |
1355 | ||
1356 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1357 | { | |
7dd5e7c3 | 1358 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1359 | struct kobject *ko; |
1edf80d3 | 1360 | char *s; |
5e55e2f5 | 1361 | int err; |
1da177e4 LT |
1362 | |
1363 | if (rdev->mddev) { | |
1364 | MD_BUG(); | |
1365 | return -EINVAL; | |
1366 | } | |
2bf071bf N |
1367 | /* make sure rdev->size exceeds mddev->size */ |
1368 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1369 | if (mddev->pers) { |
1370 | /* Cannot change size, so fail | |
1371 | * If mddev->level <= 0, then we don't care | |
1372 | * about aligning sizes (e.g. linear) | |
1373 | */ | |
1374 | if (mddev->level > 0) | |
1375 | return -ENOSPC; | |
1376 | } else | |
2bf071bf N |
1377 | mddev->size = rdev->size; |
1378 | } | |
1da177e4 LT |
1379 | |
1380 | /* Verify rdev->desc_nr is unique. | |
1381 | * If it is -1, assign a free number, else | |
1382 | * check number is not in use | |
1383 | */ | |
1384 | if (rdev->desc_nr < 0) { | |
1385 | int choice = 0; | |
1386 | if (mddev->pers) choice = mddev->raid_disks; | |
1387 | while (find_rdev_nr(mddev, choice)) | |
1388 | choice++; | |
1389 | rdev->desc_nr = choice; | |
1390 | } else { | |
1391 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1392 | return -EBUSY; | |
1393 | } | |
19133a42 N |
1394 | bdevname(rdev->bdev,b); |
1395 | if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) | |
1396 | return -ENOMEM; | |
1edf80d3 NB |
1397 | while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL) |
1398 | *s = '!'; | |
1da177e4 | 1399 | |
1da177e4 | 1400 | rdev->mddev = mddev; |
19133a42 | 1401 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1402 | |
9c791977 | 1403 | rdev->kobj.parent = &mddev->kobj; |
5e55e2f5 N |
1404 | if ((err = kobject_add(&rdev->kobj))) |
1405 | goto fail; | |
86e6ffdd | 1406 | |
f637b9f9 N |
1407 | if (rdev->bdev->bd_part) |
1408 | ko = &rdev->bdev->bd_part->kobj; | |
1409 | else | |
1410 | ko = &rdev->bdev->bd_disk->kobj; | |
5e55e2f5 N |
1411 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1412 | kobject_del(&rdev->kobj); | |
1413 | goto fail; | |
1414 | } | |
1415 | list_add(&rdev->same_set, &mddev->disks); | |
5463c790 | 1416 | bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk); |
1da177e4 | 1417 | return 0; |
5e55e2f5 N |
1418 | |
1419 | fail: | |
1420 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1421 | b, mdname(mddev)); | |
1422 | return err; | |
1da177e4 LT |
1423 | } |
1424 | ||
5792a285 N |
1425 | static void delayed_delete(struct work_struct *ws) |
1426 | { | |
1427 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1428 | kobject_del(&rdev->kobj); | |
1429 | } | |
1430 | ||
1da177e4 LT |
1431 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1432 | { | |
1433 | char b[BDEVNAME_SIZE]; | |
1434 | if (!rdev->mddev) { | |
1435 | MD_BUG(); | |
1436 | return; | |
1437 | } | |
5463c790 | 1438 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
1da177e4 LT |
1439 | list_del_init(&rdev->same_set); |
1440 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1441 | rdev->mddev = NULL; | |
86e6ffdd | 1442 | sysfs_remove_link(&rdev->kobj, "block"); |
5792a285 N |
1443 | |
1444 | /* We need to delay this, otherwise we can deadlock when | |
1445 | * writing to 'remove' to "dev/state" | |
1446 | */ | |
1447 | INIT_WORK(&rdev->del_work, delayed_delete); | |
1448 | schedule_work(&rdev->del_work); | |
1da177e4 LT |
1449 | } |
1450 | ||
1451 | /* | |
1452 | * prevent the device from being mounted, repartitioned or | |
1453 | * otherwise reused by a RAID array (or any other kernel | |
1454 | * subsystem), by bd_claiming the device. | |
1455 | */ | |
1456 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1457 | { | |
1458 | int err = 0; | |
1459 | struct block_device *bdev; | |
1460 | char b[BDEVNAME_SIZE]; | |
1461 | ||
2e7b651d | 1462 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1463 | if (IS_ERR(bdev)) { |
1464 | printk(KERN_ERR "md: could not open %s.\n", | |
1465 | __bdevname(dev, b)); | |
1466 | return PTR_ERR(bdev); | |
1467 | } | |
1468 | err = bd_claim(bdev, rdev); | |
1469 | if (err) { | |
1470 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1471 | bdevname(bdev, b)); | |
2e7b651d | 1472 | blkdev_put(bdev); |
1da177e4 LT |
1473 | return err; |
1474 | } | |
1475 | rdev->bdev = bdev; | |
1476 | return err; | |
1477 | } | |
1478 | ||
1479 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1480 | { | |
1481 | struct block_device *bdev = rdev->bdev; | |
1482 | rdev->bdev = NULL; | |
1483 | if (!bdev) | |
1484 | MD_BUG(); | |
1485 | bd_release(bdev); | |
2e7b651d | 1486 | blkdev_put(bdev); |
1da177e4 LT |
1487 | } |
1488 | ||
1489 | void md_autodetect_dev(dev_t dev); | |
1490 | ||
1491 | static void export_rdev(mdk_rdev_t * rdev) | |
1492 | { | |
1493 | char b[BDEVNAME_SIZE]; | |
1494 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1495 | bdevname(rdev->bdev,b)); | |
1496 | if (rdev->mddev) | |
1497 | MD_BUG(); | |
1498 | free_disk_sb(rdev); | |
1499 | list_del_init(&rdev->same_set); | |
1500 | #ifndef MODULE | |
1501 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1502 | #endif | |
1503 | unlock_rdev(rdev); | |
86e6ffdd | 1504 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1505 | } |
1506 | ||
1507 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1508 | { | |
1509 | unbind_rdev_from_array(rdev); | |
1510 | export_rdev(rdev); | |
1511 | } | |
1512 | ||
1513 | static void export_array(mddev_t *mddev) | |
1514 | { | |
1515 | struct list_head *tmp; | |
1516 | mdk_rdev_t *rdev; | |
1517 | ||
1518 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1519 | if (!rdev->mddev) { | |
1520 | MD_BUG(); | |
1521 | continue; | |
1522 | } | |
1523 | kick_rdev_from_array(rdev); | |
1524 | } | |
1525 | if (!list_empty(&mddev->disks)) | |
1526 | MD_BUG(); | |
1527 | mddev->raid_disks = 0; | |
1528 | mddev->major_version = 0; | |
1529 | } | |
1530 | ||
1531 | static void print_desc(mdp_disk_t *desc) | |
1532 | { | |
1533 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1534 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1535 | } | |
1536 | ||
1537 | static void print_sb(mdp_super_t *sb) | |
1538 | { | |
1539 | int i; | |
1540 | ||
1541 | printk(KERN_INFO | |
1542 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1543 | sb->major_version, sb->minor_version, sb->patch_version, | |
1544 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1545 | sb->ctime); | |
1546 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1547 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1548 | sb->md_minor, sb->layout, sb->chunk_size); | |
1549 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1550 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1551 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1552 | sb->failed_disks, sb->spare_disks, | |
1553 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1554 | ||
1555 | printk(KERN_INFO); | |
1556 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1557 | mdp_disk_t *desc; | |
1558 | ||
1559 | desc = sb->disks + i; | |
1560 | if (desc->number || desc->major || desc->minor || | |
1561 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1562 | printk(" D %2d: ", i); | |
1563 | print_desc(desc); | |
1564 | } | |
1565 | } | |
1566 | printk(KERN_INFO "md: THIS: "); | |
1567 | print_desc(&sb->this_disk); | |
1568 | ||
1569 | } | |
1570 | ||
1571 | static void print_rdev(mdk_rdev_t *rdev) | |
1572 | { | |
1573 | char b[BDEVNAME_SIZE]; | |
1574 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1575 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1576 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1577 | rdev->desc_nr); | |
1da177e4 LT |
1578 | if (rdev->sb_loaded) { |
1579 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1580 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1581 | } else | |
1582 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1583 | } | |
1584 | ||
5e56341d | 1585 | static void md_print_devices(void) |
1da177e4 LT |
1586 | { |
1587 | struct list_head *tmp, *tmp2; | |
1588 | mdk_rdev_t *rdev; | |
1589 | mddev_t *mddev; | |
1590 | char b[BDEVNAME_SIZE]; | |
1591 | ||
1592 | printk("\n"); | |
1593 | printk("md: **********************************\n"); | |
1594 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1595 | printk("md: **********************************\n"); | |
1596 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1597 | |
32a7627c N |
1598 | if (mddev->bitmap) |
1599 | bitmap_print_sb(mddev->bitmap); | |
1600 | else | |
1601 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1602 | ITERATE_RDEV(mddev,rdev,tmp2) |
1603 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1604 | printk("\n"); | |
1605 | ||
1606 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1607 | print_rdev(rdev); | |
1608 | } | |
1609 | printk("md: **********************************\n"); | |
1610 | printk("\n"); | |
1611 | } | |
1612 | ||
1613 | ||
42543769 | 1614 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1615 | { |
42543769 N |
1616 | /* Update each superblock (in-memory image), but |
1617 | * if we are allowed to, skip spares which already | |
1618 | * have the right event counter, or have one earlier | |
1619 | * (which would mean they aren't being marked as dirty | |
1620 | * with the rest of the array) | |
1621 | */ | |
1da177e4 LT |
1622 | mdk_rdev_t *rdev; |
1623 | struct list_head *tmp; | |
1624 | ||
1625 | ITERATE_RDEV(mddev,rdev,tmp) { | |
42543769 N |
1626 | if (rdev->sb_events == mddev->events || |
1627 | (nospares && | |
1628 | rdev->raid_disk < 0 && | |
1629 | (rdev->sb_events&1)==0 && | |
1630 | rdev->sb_events+1 == mddev->events)) { | |
1631 | /* Don't update this superblock */ | |
1632 | rdev->sb_loaded = 2; | |
1633 | } else { | |
1634 | super_types[mddev->major_version]. | |
1635 | sync_super(mddev, rdev); | |
1636 | rdev->sb_loaded = 1; | |
1637 | } | |
1da177e4 LT |
1638 | } |
1639 | } | |
1640 | ||
850b2b42 | 1641 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1642 | { |
7bfa19f2 | 1643 | int err; |
1da177e4 LT |
1644 | struct list_head *tmp; |
1645 | mdk_rdev_t *rdev; | |
06d91a5f | 1646 | int sync_req; |
42543769 | 1647 | int nospares = 0; |
1da177e4 | 1648 | |
1da177e4 | 1649 | repeat: |
a9701a30 | 1650 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1651 | |
850b2b42 N |
1652 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1653 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1654 | force_change = 1; | |
1655 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1656 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1657 | * though if events isn't the right even/odd, we will have to do | |
1658 | * spares after all | |
1659 | */ | |
1660 | nospares = 1; | |
1661 | if (force_change) | |
1662 | nospares = 0; | |
1663 | if (mddev->degraded) | |
84692195 N |
1664 | /* If the array is degraded, then skipping spares is both |
1665 | * dangerous and fairly pointless. | |
1666 | * Dangerous because a device that was removed from the array | |
1667 | * might have a event_count that still looks up-to-date, | |
1668 | * so it can be re-added without a resync. | |
1669 | * Pointless because if there are any spares to skip, | |
1670 | * then a recovery will happen and soon that array won't | |
1671 | * be degraded any more and the spare can go back to sleep then. | |
1672 | */ | |
850b2b42 | 1673 | nospares = 0; |
84692195 | 1674 | |
06d91a5f | 1675 | sync_req = mddev->in_sync; |
1da177e4 | 1676 | mddev->utime = get_seconds(); |
42543769 N |
1677 | |
1678 | /* If this is just a dirty<->clean transition, and the array is clean | |
1679 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1680 | if (nospares |
42543769 | 1681 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1682 | && (mddev->events & 1) |
1683 | && mddev->events != 1) | |
42543769 N |
1684 | mddev->events--; |
1685 | else { | |
1686 | /* otherwise we have to go forward and ... */ | |
1687 | mddev->events ++; | |
1688 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1689 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1690 | if ((mddev->events&1)==0) { | |
1691 | mddev->events++; | |
1692 | nospares = 0; | |
1693 | } | |
1694 | } else { | |
1695 | /* otherwise insist on an even 'events' (for clean states) */ | |
1696 | if ((mddev->events&1)) { | |
1697 | mddev->events++; | |
1698 | nospares = 0; | |
1699 | } | |
1700 | } | |
1701 | } | |
1da177e4 LT |
1702 | |
1703 | if (!mddev->events) { | |
1704 | /* | |
1705 | * oops, this 64-bit counter should never wrap. | |
1706 | * Either we are in around ~1 trillion A.C., assuming | |
1707 | * 1 reboot per second, or we have a bug: | |
1708 | */ | |
1709 | MD_BUG(); | |
1710 | mddev->events --; | |
1711 | } | |
42543769 | 1712 | sync_sbs(mddev, nospares); |
1da177e4 LT |
1713 | |
1714 | /* | |
1715 | * do not write anything to disk if using | |
1716 | * nonpersistent superblocks | |
1717 | */ | |
06d91a5f | 1718 | if (!mddev->persistent) { |
850b2b42 | 1719 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1720 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1721 | wake_up(&mddev->sb_wait); |
1da177e4 | 1722 | return; |
06d91a5f | 1723 | } |
a9701a30 | 1724 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1725 | |
1726 | dprintk(KERN_INFO | |
1727 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1728 | mdname(mddev),mddev->in_sync); | |
1729 | ||
32a7627c | 1730 | err = bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1731 | ITERATE_RDEV(mddev,rdev,tmp) { |
1732 | char b[BDEVNAME_SIZE]; | |
1733 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1734 | if (rdev->sb_loaded != 1) |
1735 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1736 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1737 | dprintk("(skipping faulty "); |
1738 | ||
1739 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1740 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1741 | md_super_write(mddev,rdev, |
0002b271 | 1742 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1743 | rdev->sb_page); |
1744 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1745 | bdevname(rdev->bdev,b), | |
1746 | (unsigned long long)rdev->sb_offset); | |
42543769 | 1747 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1748 | |
1da177e4 LT |
1749 | } else |
1750 | dprintk(")\n"); | |
7bfa19f2 | 1751 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1752 | /* only need to write one superblock... */ |
1753 | break; | |
1754 | } | |
a9701a30 | 1755 | md_super_wait(mddev); |
850b2b42 | 1756 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1757 | |
a9701a30 | 1758 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1759 | if (mddev->in_sync != sync_req || |
1760 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1761 | /* have to write it out again */ |
a9701a30 | 1762 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1763 | goto repeat; |
1764 | } | |
850b2b42 | 1765 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1766 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1767 | wake_up(&mddev->sb_wait); |
06d91a5f | 1768 | |
1da177e4 LT |
1769 | } |
1770 | ||
bce74dac N |
1771 | /* words written to sysfs files may, or my not, be \n terminated. |
1772 | * We want to accept with case. For this we use cmd_match. | |
1773 | */ | |
1774 | static int cmd_match(const char *cmd, const char *str) | |
1775 | { | |
1776 | /* See if cmd, written into a sysfs file, matches | |
1777 | * str. They must either be the same, or cmd can | |
1778 | * have a trailing newline | |
1779 | */ | |
1780 | while (*cmd && *str && *cmd == *str) { | |
1781 | cmd++; | |
1782 | str++; | |
1783 | } | |
1784 | if (*cmd == '\n') | |
1785 | cmd++; | |
1786 | if (*str || *cmd) | |
1787 | return 0; | |
1788 | return 1; | |
1789 | } | |
1790 | ||
86e6ffdd N |
1791 | struct rdev_sysfs_entry { |
1792 | struct attribute attr; | |
1793 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1794 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1795 | }; | |
1796 | ||
1797 | static ssize_t | |
96de1e66 | 1798 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1799 | { |
1800 | char *sep = ""; | |
1801 | int len=0; | |
1802 | ||
b2d444d7 | 1803 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1804 | len+= sprintf(page+len, "%sfaulty",sep); |
1805 | sep = ","; | |
1806 | } | |
b2d444d7 | 1807 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1808 | len += sprintf(page+len, "%sin_sync",sep); |
1809 | sep = ","; | |
1810 | } | |
f655675b N |
1811 | if (test_bit(WriteMostly, &rdev->flags)) { |
1812 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1813 | sep = ","; | |
1814 | } | |
b2d444d7 N |
1815 | if (!test_bit(Faulty, &rdev->flags) && |
1816 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1817 | len += sprintf(page+len, "%sspare", sep); |
1818 | sep = ","; | |
1819 | } | |
1820 | return len+sprintf(page+len, "\n"); | |
1821 | } | |
1822 | ||
45dc2de1 N |
1823 | static ssize_t |
1824 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1825 | { | |
1826 | /* can write | |
1827 | * faulty - simulates and error | |
1828 | * remove - disconnects the device | |
f655675b N |
1829 | * writemostly - sets write_mostly |
1830 | * -writemostly - clears write_mostly | |
45dc2de1 N |
1831 | */ |
1832 | int err = -EINVAL; | |
1833 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1834 | md_error(rdev->mddev, rdev); | |
1835 | err = 0; | |
1836 | } else if (cmd_match(buf, "remove")) { | |
1837 | if (rdev->raid_disk >= 0) | |
1838 | err = -EBUSY; | |
1839 | else { | |
1840 | mddev_t *mddev = rdev->mddev; | |
1841 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1842 | if (mddev->pers) |
1843 | md_update_sb(mddev, 1); | |
45dc2de1 N |
1844 | md_new_event(mddev); |
1845 | err = 0; | |
1846 | } | |
f655675b N |
1847 | } else if (cmd_match(buf, "writemostly")) { |
1848 | set_bit(WriteMostly, &rdev->flags); | |
1849 | err = 0; | |
1850 | } else if (cmd_match(buf, "-writemostly")) { | |
1851 | clear_bit(WriteMostly, &rdev->flags); | |
1852 | err = 0; | |
45dc2de1 N |
1853 | } |
1854 | return err ? err : len; | |
1855 | } | |
80ca3a44 N |
1856 | static struct rdev_sysfs_entry rdev_state = |
1857 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd N |
1858 | |
1859 | static ssize_t | |
96de1e66 | 1860 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1861 | { |
1862 | if (rdev->sb_loaded && rdev->sb_size) { | |
1863 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1864 | return rdev->sb_size; | |
1865 | } else | |
1866 | return 0; | |
1867 | } | |
96de1e66 N |
1868 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1869 | ||
4dbcdc75 N |
1870 | static ssize_t |
1871 | errors_show(mdk_rdev_t *rdev, char *page) | |
1872 | { | |
1873 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1874 | } | |
1875 | ||
1876 | static ssize_t | |
1877 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1878 | { | |
1879 | char *e; | |
1880 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1881 | if (*buf && (*e == 0 || *e == '\n')) { | |
1882 | atomic_set(&rdev->corrected_errors, n); | |
1883 | return len; | |
1884 | } | |
1885 | return -EINVAL; | |
1886 | } | |
1887 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 1888 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 1889 | |
014236d2 N |
1890 | static ssize_t |
1891 | slot_show(mdk_rdev_t *rdev, char *page) | |
1892 | { | |
1893 | if (rdev->raid_disk < 0) | |
1894 | return sprintf(page, "none\n"); | |
1895 | else | |
1896 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1897 | } | |
1898 | ||
1899 | static ssize_t | |
1900 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1901 | { | |
1902 | char *e; | |
1903 | int slot = simple_strtoul(buf, &e, 10); | |
1904 | if (strncmp(buf, "none", 4)==0) | |
1905 | slot = -1; | |
1906 | else if (e==buf || (*e && *e!= '\n')) | |
1907 | return -EINVAL; | |
1908 | if (rdev->mddev->pers) | |
1909 | /* Cannot set slot in active array (yet) */ | |
1910 | return -EBUSY; | |
1911 | if (slot >= rdev->mddev->raid_disks) | |
1912 | return -ENOSPC; | |
1913 | rdev->raid_disk = slot; | |
1914 | /* assume it is working */ | |
1915 | rdev->flags = 0; | |
1916 | set_bit(In_sync, &rdev->flags); | |
1917 | return len; | |
1918 | } | |
1919 | ||
1920 | ||
1921 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 1922 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 1923 | |
93c8cad0 N |
1924 | static ssize_t |
1925 | offset_show(mdk_rdev_t *rdev, char *page) | |
1926 | { | |
6961ece4 | 1927 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
1928 | } |
1929 | ||
1930 | static ssize_t | |
1931 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1932 | { | |
1933 | char *e; | |
1934 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
1935 | if (e==buf || (*e && *e != '\n')) | |
1936 | return -EINVAL; | |
1937 | if (rdev->mddev->pers) | |
1938 | return -EBUSY; | |
1939 | rdev->data_offset = offset; | |
1940 | return len; | |
1941 | } | |
1942 | ||
1943 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 1944 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 1945 | |
83303b61 N |
1946 | static ssize_t |
1947 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
1948 | { | |
1949 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
1950 | } | |
1951 | ||
1952 | static ssize_t | |
1953 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1954 | { | |
1955 | char *e; | |
1956 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
1957 | if (e==buf || (*e && *e != '\n')) | |
1958 | return -EINVAL; | |
1959 | if (rdev->mddev->pers) | |
1960 | return -EBUSY; | |
1961 | rdev->size = size; | |
1962 | if (size < rdev->mddev->size || rdev->mddev->size == 0) | |
1963 | rdev->mddev->size = size; | |
1964 | return len; | |
1965 | } | |
1966 | ||
1967 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 1968 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 1969 | |
86e6ffdd N |
1970 | static struct attribute *rdev_default_attrs[] = { |
1971 | &rdev_state.attr, | |
1972 | &rdev_super.attr, | |
4dbcdc75 | 1973 | &rdev_errors.attr, |
014236d2 | 1974 | &rdev_slot.attr, |
93c8cad0 | 1975 | &rdev_offset.attr, |
83303b61 | 1976 | &rdev_size.attr, |
86e6ffdd N |
1977 | NULL, |
1978 | }; | |
1979 | static ssize_t | |
1980 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1981 | { | |
1982 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1983 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1984 | ||
1985 | if (!entry->show) | |
1986 | return -EIO; | |
1987 | return entry->show(rdev, page); | |
1988 | } | |
1989 | ||
1990 | static ssize_t | |
1991 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1992 | const char *page, size_t length) | |
1993 | { | |
1994 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1995 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1996 | ||
1997 | if (!entry->store) | |
1998 | return -EIO; | |
67463acb N |
1999 | if (!capable(CAP_SYS_ADMIN)) |
2000 | return -EACCES; | |
86e6ffdd N |
2001 | return entry->store(rdev, page, length); |
2002 | } | |
2003 | ||
2004 | static void rdev_free(struct kobject *ko) | |
2005 | { | |
2006 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2007 | kfree(rdev); | |
2008 | } | |
2009 | static struct sysfs_ops rdev_sysfs_ops = { | |
2010 | .show = rdev_attr_show, | |
2011 | .store = rdev_attr_store, | |
2012 | }; | |
2013 | static struct kobj_type rdev_ktype = { | |
2014 | .release = rdev_free, | |
2015 | .sysfs_ops = &rdev_sysfs_ops, | |
2016 | .default_attrs = rdev_default_attrs, | |
2017 | }; | |
2018 | ||
1da177e4 LT |
2019 | /* |
2020 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2021 | * | |
2022 | * mark the device faulty if: | |
2023 | * | |
2024 | * - the device is nonexistent (zero size) | |
2025 | * - the device has no valid superblock | |
2026 | * | |
2027 | * a faulty rdev _never_ has rdev->sb set. | |
2028 | */ | |
2029 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2030 | { | |
2031 | char b[BDEVNAME_SIZE]; | |
2032 | int err; | |
2033 | mdk_rdev_t *rdev; | |
2034 | sector_t size; | |
2035 | ||
9ffae0cf | 2036 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2037 | if (!rdev) { |
2038 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2039 | return ERR_PTR(-ENOMEM); | |
2040 | } | |
1da177e4 LT |
2041 | |
2042 | if ((err = alloc_disk_sb(rdev))) | |
2043 | goto abort_free; | |
2044 | ||
2045 | err = lock_rdev(rdev, newdev); | |
2046 | if (err) | |
2047 | goto abort_free; | |
2048 | ||
86e6ffdd N |
2049 | rdev->kobj.parent = NULL; |
2050 | rdev->kobj.ktype = &rdev_ktype; | |
2051 | kobject_init(&rdev->kobj); | |
2052 | ||
1da177e4 | 2053 | rdev->desc_nr = -1; |
2b6e8459 | 2054 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2055 | rdev->raid_disk = -1; |
b2d444d7 | 2056 | rdev->flags = 0; |
1da177e4 | 2057 | rdev->data_offset = 0; |
42543769 | 2058 | rdev->sb_events = 0; |
1da177e4 | 2059 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2060 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2061 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2062 | |
2063 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2064 | if (!size) { | |
2065 | printk(KERN_WARNING | |
2066 | "md: %s has zero or unknown size, marking faulty!\n", | |
2067 | bdevname(rdev->bdev,b)); | |
2068 | err = -EINVAL; | |
2069 | goto abort_free; | |
2070 | } | |
2071 | ||
2072 | if (super_format >= 0) { | |
2073 | err = super_types[super_format]. | |
2074 | load_super(rdev, NULL, super_minor); | |
2075 | if (err == -EINVAL) { | |
df968c4e N |
2076 | printk(KERN_WARNING |
2077 | "md: %s does not have a valid v%d.%d " | |
2078 | "superblock, not importing!\n", | |
2079 | bdevname(rdev->bdev,b), | |
2080 | super_format, super_minor); | |
1da177e4 LT |
2081 | goto abort_free; |
2082 | } | |
2083 | if (err < 0) { | |
2084 | printk(KERN_WARNING | |
2085 | "md: could not read %s's sb, not importing!\n", | |
2086 | bdevname(rdev->bdev,b)); | |
2087 | goto abort_free; | |
2088 | } | |
2089 | } | |
2090 | INIT_LIST_HEAD(&rdev->same_set); | |
2091 | ||
2092 | return rdev; | |
2093 | ||
2094 | abort_free: | |
2095 | if (rdev->sb_page) { | |
2096 | if (rdev->bdev) | |
2097 | unlock_rdev(rdev); | |
2098 | free_disk_sb(rdev); | |
2099 | } | |
2100 | kfree(rdev); | |
2101 | return ERR_PTR(err); | |
2102 | } | |
2103 | ||
2104 | /* | |
2105 | * Check a full RAID array for plausibility | |
2106 | */ | |
2107 | ||
2108 | ||
a757e64c | 2109 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2110 | { |
2111 | int i; | |
2112 | struct list_head *tmp; | |
2113 | mdk_rdev_t *rdev, *freshest; | |
2114 | char b[BDEVNAME_SIZE]; | |
2115 | ||
2116 | freshest = NULL; | |
2117 | ITERATE_RDEV(mddev,rdev,tmp) | |
2118 | switch (super_types[mddev->major_version]. | |
2119 | load_super(rdev, freshest, mddev->minor_version)) { | |
2120 | case 1: | |
2121 | freshest = rdev; | |
2122 | break; | |
2123 | case 0: | |
2124 | break; | |
2125 | default: | |
2126 | printk( KERN_ERR \ | |
2127 | "md: fatal superblock inconsistency in %s" | |
2128 | " -- removing from array\n", | |
2129 | bdevname(rdev->bdev,b)); | |
2130 | kick_rdev_from_array(rdev); | |
2131 | } | |
2132 | ||
2133 | ||
2134 | super_types[mddev->major_version]. | |
2135 | validate_super(mddev, freshest); | |
2136 | ||
2137 | i = 0; | |
2138 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2139 | if (rdev != freshest) | |
2140 | if (super_types[mddev->major_version]. | |
2141 | validate_super(mddev, rdev)) { | |
2142 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2143 | " from array!\n", | |
2144 | bdevname(rdev->bdev,b)); | |
2145 | kick_rdev_from_array(rdev); | |
2146 | continue; | |
2147 | } | |
2148 | if (mddev->level == LEVEL_MULTIPATH) { | |
2149 | rdev->desc_nr = i++; | |
2150 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2151 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2152 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2153 | rdev->raid_disk = -1; | |
2154 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2155 | } |
2156 | } | |
2157 | ||
2158 | ||
2159 | ||
2160 | if (mddev->recovery_cp != MaxSector && | |
2161 | mddev->level >= 1) | |
2162 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2163 | " -- starting background reconstruction\n", | |
2164 | mdname(mddev)); | |
2165 | ||
1da177e4 LT |
2166 | } |
2167 | ||
16f17b39 N |
2168 | static ssize_t |
2169 | safe_delay_show(mddev_t *mddev, char *page) | |
2170 | { | |
2171 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2172 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2173 | } | |
2174 | static ssize_t | |
2175 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2176 | { | |
2177 | int scale=1; | |
2178 | int dot=0; | |
2179 | int i; | |
2180 | unsigned long msec; | |
2181 | char buf[30]; | |
2182 | char *e; | |
2183 | /* remove a period, and count digits after it */ | |
2184 | if (len >= sizeof(buf)) | |
2185 | return -EINVAL; | |
2186 | strlcpy(buf, cbuf, len); | |
2187 | buf[len] = 0; | |
2188 | for (i=0; i<len; i++) { | |
2189 | if (dot) { | |
2190 | if (isdigit(buf[i])) { | |
2191 | buf[i-1] = buf[i]; | |
2192 | scale *= 10; | |
2193 | } | |
2194 | buf[i] = 0; | |
2195 | } else if (buf[i] == '.') { | |
2196 | dot=1; | |
2197 | buf[i] = 0; | |
2198 | } | |
2199 | } | |
2200 | msec = simple_strtoul(buf, &e, 10); | |
2201 | if (e == buf || (*e && *e != '\n')) | |
2202 | return -EINVAL; | |
2203 | msec = (msec * 1000) / scale; | |
2204 | if (msec == 0) | |
2205 | mddev->safemode_delay = 0; | |
2206 | else { | |
2207 | mddev->safemode_delay = (msec*HZ)/1000; | |
2208 | if (mddev->safemode_delay == 0) | |
2209 | mddev->safemode_delay = 1; | |
2210 | } | |
2211 | return len; | |
2212 | } | |
2213 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2214 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2215 | |
eae1701f | 2216 | static ssize_t |
96de1e66 | 2217 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2218 | { |
2604b703 | 2219 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2220 | if (p) |
eae1701f | 2221 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2222 | else if (mddev->clevel[0]) |
2223 | return sprintf(page, "%s\n", mddev->clevel); | |
2224 | else if (mddev->level != LEVEL_NONE) | |
2225 | return sprintf(page, "%d\n", mddev->level); | |
2226 | else | |
2227 | return 0; | |
eae1701f N |
2228 | } |
2229 | ||
d9d166c2 N |
2230 | static ssize_t |
2231 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2232 | { | |
2233 | int rv = len; | |
2234 | if (mddev->pers) | |
2235 | return -EBUSY; | |
2236 | if (len == 0) | |
2237 | return 0; | |
2238 | if (len >= sizeof(mddev->clevel)) | |
2239 | return -ENOSPC; | |
2240 | strncpy(mddev->clevel, buf, len); | |
2241 | if (mddev->clevel[len-1] == '\n') | |
2242 | len--; | |
2243 | mddev->clevel[len] = 0; | |
2244 | mddev->level = LEVEL_NONE; | |
2245 | return rv; | |
2246 | } | |
2247 | ||
2248 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2249 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2250 | |
d4dbd025 N |
2251 | |
2252 | static ssize_t | |
2253 | layout_show(mddev_t *mddev, char *page) | |
2254 | { | |
2255 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2256 | if (mddev->reshape_position != MaxSector && |
2257 | mddev->layout != mddev->new_layout) | |
2258 | return sprintf(page, "%d (%d)\n", | |
2259 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2260 | return sprintf(page, "%d\n", mddev->layout); |
2261 | } | |
2262 | ||
2263 | static ssize_t | |
2264 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2265 | { | |
2266 | char *e; | |
2267 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2268 | |
2269 | if (!*buf || (*e && *e != '\n')) | |
2270 | return -EINVAL; | |
2271 | ||
08a02ecd N |
2272 | if (mddev->pers) |
2273 | return -EBUSY; | |
2274 | if (mddev->reshape_position != MaxSector) | |
2275 | mddev->new_layout = n; | |
2276 | else | |
2277 | mddev->layout = n; | |
d4dbd025 N |
2278 | return len; |
2279 | } | |
2280 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2281 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2282 | |
2283 | ||
eae1701f | 2284 | static ssize_t |
96de1e66 | 2285 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2286 | { |
bb636547 N |
2287 | if (mddev->raid_disks == 0) |
2288 | return 0; | |
08a02ecd N |
2289 | if (mddev->reshape_position != MaxSector && |
2290 | mddev->delta_disks != 0) | |
2291 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2292 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2293 | return sprintf(page, "%d\n", mddev->raid_disks); |
2294 | } | |
2295 | ||
da943b99 N |
2296 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2297 | ||
2298 | static ssize_t | |
2299 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2300 | { | |
da943b99 N |
2301 | char *e; |
2302 | int rv = 0; | |
2303 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2304 | ||
2305 | if (!*buf || (*e && *e != '\n')) | |
2306 | return -EINVAL; | |
2307 | ||
2308 | if (mddev->pers) | |
2309 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2310 | else if (mddev->reshape_position != MaxSector) { |
2311 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2312 | mddev->delta_disks = n - olddisks; | |
2313 | mddev->raid_disks = n; | |
2314 | } else | |
da943b99 N |
2315 | mddev->raid_disks = n; |
2316 | return rv ? rv : len; | |
2317 | } | |
2318 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2319 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2320 | |
3b34380a N |
2321 | static ssize_t |
2322 | chunk_size_show(mddev_t *mddev, char *page) | |
2323 | { | |
08a02ecd N |
2324 | if (mddev->reshape_position != MaxSector && |
2325 | mddev->chunk_size != mddev->new_chunk) | |
2326 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2327 | mddev->chunk_size); | |
3b34380a N |
2328 | return sprintf(page, "%d\n", mddev->chunk_size); |
2329 | } | |
2330 | ||
2331 | static ssize_t | |
2332 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2333 | { | |
2334 | /* can only set chunk_size if array is not yet active */ | |
2335 | char *e; | |
2336 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2337 | ||
3b34380a N |
2338 | if (!*buf || (*e && *e != '\n')) |
2339 | return -EINVAL; | |
2340 | ||
08a02ecd N |
2341 | if (mddev->pers) |
2342 | return -EBUSY; | |
2343 | else if (mddev->reshape_position != MaxSector) | |
2344 | mddev->new_chunk = n; | |
2345 | else | |
2346 | mddev->chunk_size = n; | |
3b34380a N |
2347 | return len; |
2348 | } | |
2349 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2350 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2351 | |
a94213b1 N |
2352 | static ssize_t |
2353 | resync_start_show(mddev_t *mddev, char *page) | |
2354 | { | |
2355 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2356 | } | |
2357 | ||
2358 | static ssize_t | |
2359 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2360 | { | |
2361 | /* can only set chunk_size if array is not yet active */ | |
2362 | char *e; | |
2363 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2364 | ||
2365 | if (mddev->pers) | |
2366 | return -EBUSY; | |
2367 | if (!*buf || (*e && *e != '\n')) | |
2368 | return -EINVAL; | |
2369 | ||
2370 | mddev->recovery_cp = n; | |
2371 | return len; | |
2372 | } | |
2373 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2374 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2375 | |
9e653b63 N |
2376 | /* |
2377 | * The array state can be: | |
2378 | * | |
2379 | * clear | |
2380 | * No devices, no size, no level | |
2381 | * Equivalent to STOP_ARRAY ioctl | |
2382 | * inactive | |
2383 | * May have some settings, but array is not active | |
2384 | * all IO results in error | |
2385 | * When written, doesn't tear down array, but just stops it | |
2386 | * suspended (not supported yet) | |
2387 | * All IO requests will block. The array can be reconfigured. | |
2388 | * Writing this, if accepted, will block until array is quiessent | |
2389 | * readonly | |
2390 | * no resync can happen. no superblocks get written. | |
2391 | * write requests fail | |
2392 | * read-auto | |
2393 | * like readonly, but behaves like 'clean' on a write request. | |
2394 | * | |
2395 | * clean - no pending writes, but otherwise active. | |
2396 | * When written to inactive array, starts without resync | |
2397 | * If a write request arrives then | |
2398 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2399 | * if not known, block and switch to write-pending | |
2400 | * If written to an active array that has pending writes, then fails. | |
2401 | * active | |
2402 | * fully active: IO and resync can be happening. | |
2403 | * When written to inactive array, starts with resync | |
2404 | * | |
2405 | * write-pending | |
2406 | * clean, but writes are blocked waiting for 'active' to be written. | |
2407 | * | |
2408 | * active-idle | |
2409 | * like active, but no writes have been seen for a while (100msec). | |
2410 | * | |
2411 | */ | |
2412 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2413 | write_pending, active_idle, bad_word}; | |
05381954 | 2414 | static char *array_states[] = { |
9e653b63 N |
2415 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2416 | "write-pending", "active-idle", NULL }; | |
2417 | ||
2418 | static int match_word(const char *word, char **list) | |
2419 | { | |
2420 | int n; | |
2421 | for (n=0; list[n]; n++) | |
2422 | if (cmd_match(word, list[n])) | |
2423 | break; | |
2424 | return n; | |
2425 | } | |
2426 | ||
2427 | static ssize_t | |
2428 | array_state_show(mddev_t *mddev, char *page) | |
2429 | { | |
2430 | enum array_state st = inactive; | |
2431 | ||
2432 | if (mddev->pers) | |
2433 | switch(mddev->ro) { | |
2434 | case 1: | |
2435 | st = readonly; | |
2436 | break; | |
2437 | case 2: | |
2438 | st = read_auto; | |
2439 | break; | |
2440 | case 0: | |
2441 | if (mddev->in_sync) | |
2442 | st = clean; | |
2443 | else if (mddev->safemode) | |
2444 | st = active_idle; | |
2445 | else | |
2446 | st = active; | |
2447 | } | |
2448 | else { | |
2449 | if (list_empty(&mddev->disks) && | |
2450 | mddev->raid_disks == 0 && | |
2451 | mddev->size == 0) | |
2452 | st = clear; | |
2453 | else | |
2454 | st = inactive; | |
2455 | } | |
2456 | return sprintf(page, "%s\n", array_states[st]); | |
2457 | } | |
2458 | ||
2459 | static int do_md_stop(mddev_t * mddev, int ro); | |
2460 | static int do_md_run(mddev_t * mddev); | |
2461 | static int restart_array(mddev_t *mddev); | |
2462 | ||
2463 | static ssize_t | |
2464 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2465 | { | |
2466 | int err = -EINVAL; | |
2467 | enum array_state st = match_word(buf, array_states); | |
2468 | switch(st) { | |
2469 | case bad_word: | |
2470 | break; | |
2471 | case clear: | |
2472 | /* stopping an active array */ | |
2473 | if (mddev->pers) { | |
2474 | if (atomic_read(&mddev->active) > 1) | |
2475 | return -EBUSY; | |
2476 | err = do_md_stop(mddev, 0); | |
2477 | } | |
2478 | break; | |
2479 | case inactive: | |
2480 | /* stopping an active array */ | |
2481 | if (mddev->pers) { | |
2482 | if (atomic_read(&mddev->active) > 1) | |
2483 | return -EBUSY; | |
2484 | err = do_md_stop(mddev, 2); | |
2485 | } | |
2486 | break; | |
2487 | case suspended: | |
2488 | break; /* not supported yet */ | |
2489 | case readonly: | |
2490 | if (mddev->pers) | |
2491 | err = do_md_stop(mddev, 1); | |
2492 | else { | |
2493 | mddev->ro = 1; | |
2494 | err = do_md_run(mddev); | |
2495 | } | |
2496 | break; | |
2497 | case read_auto: | |
2498 | /* stopping an active array */ | |
2499 | if (mddev->pers) { | |
2500 | err = do_md_stop(mddev, 1); | |
2501 | if (err == 0) | |
2502 | mddev->ro = 2; /* FIXME mark devices writable */ | |
2503 | } else { | |
2504 | mddev->ro = 2; | |
2505 | err = do_md_run(mddev); | |
2506 | } | |
2507 | break; | |
2508 | case clean: | |
2509 | if (mddev->pers) { | |
2510 | restart_array(mddev); | |
2511 | spin_lock_irq(&mddev->write_lock); | |
2512 | if (atomic_read(&mddev->writes_pending) == 0) { | |
2513 | mddev->in_sync = 1; | |
850b2b42 | 2514 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
9e653b63 N |
2515 | } |
2516 | spin_unlock_irq(&mddev->write_lock); | |
2517 | } else { | |
2518 | mddev->ro = 0; | |
2519 | mddev->recovery_cp = MaxSector; | |
2520 | err = do_md_run(mddev); | |
2521 | } | |
2522 | break; | |
2523 | case active: | |
2524 | if (mddev->pers) { | |
2525 | restart_array(mddev); | |
850b2b42 | 2526 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
9e653b63 N |
2527 | wake_up(&mddev->sb_wait); |
2528 | err = 0; | |
2529 | } else { | |
2530 | mddev->ro = 0; | |
2531 | err = do_md_run(mddev); | |
2532 | } | |
2533 | break; | |
2534 | case write_pending: | |
2535 | case active_idle: | |
2536 | /* these cannot be set */ | |
2537 | break; | |
2538 | } | |
2539 | if (err) | |
2540 | return err; | |
2541 | else | |
2542 | return len; | |
2543 | } | |
80ca3a44 N |
2544 | static struct md_sysfs_entry md_array_state = |
2545 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2546 | |
6d7ff738 N |
2547 | static ssize_t |
2548 | null_show(mddev_t *mddev, char *page) | |
2549 | { | |
2550 | return -EINVAL; | |
2551 | } | |
2552 | ||
2553 | static ssize_t | |
2554 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2555 | { | |
2556 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2557 | /* The new device is added to the array. | |
2558 | * If the array has a persistent superblock, we read the | |
2559 | * superblock to initialise info and check validity. | |
2560 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2561 | * which mainly checks size. | |
2562 | */ | |
2563 | char *e; | |
2564 | int major = simple_strtoul(buf, &e, 10); | |
2565 | int minor; | |
2566 | dev_t dev; | |
2567 | mdk_rdev_t *rdev; | |
2568 | int err; | |
2569 | ||
2570 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2571 | return -EINVAL; | |
2572 | minor = simple_strtoul(e+1, &e, 10); | |
2573 | if (*e && *e != '\n') | |
2574 | return -EINVAL; | |
2575 | dev = MKDEV(major, minor); | |
2576 | if (major != MAJOR(dev) || | |
2577 | minor != MINOR(dev)) | |
2578 | return -EOVERFLOW; | |
2579 | ||
2580 | ||
2581 | if (mddev->persistent) { | |
2582 | rdev = md_import_device(dev, mddev->major_version, | |
2583 | mddev->minor_version); | |
2584 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2585 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2586 | mdk_rdev_t, same_set); | |
2587 | err = super_types[mddev->major_version] | |
2588 | .load_super(rdev, rdev0, mddev->minor_version); | |
2589 | if (err < 0) | |
2590 | goto out; | |
2591 | } | |
2592 | } else | |
2593 | rdev = md_import_device(dev, -1, -1); | |
2594 | ||
2595 | if (IS_ERR(rdev)) | |
2596 | return PTR_ERR(rdev); | |
2597 | err = bind_rdev_to_array(rdev, mddev); | |
2598 | out: | |
2599 | if (err) | |
2600 | export_rdev(rdev); | |
2601 | return err ? err : len; | |
2602 | } | |
2603 | ||
2604 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2605 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2606 | |
9b1d1dac PC |
2607 | static ssize_t |
2608 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2609 | { | |
2610 | char *end; | |
2611 | unsigned long chunk, end_chunk; | |
2612 | ||
2613 | if (!mddev->bitmap) | |
2614 | goto out; | |
2615 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2616 | while (*buf) { | |
2617 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2618 | if (buf == end) break; | |
2619 | if (*end == '-') { /* range */ | |
2620 | buf = end + 1; | |
2621 | end_chunk = simple_strtoul(buf, &end, 0); | |
2622 | if (buf == end) break; | |
2623 | } | |
2624 | if (*end && !isspace(*end)) break; | |
2625 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2626 | buf = end; | |
2627 | while (isspace(*buf)) buf++; | |
2628 | } | |
2629 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2630 | out: | |
2631 | return len; | |
2632 | } | |
2633 | ||
2634 | static struct md_sysfs_entry md_bitmap = | |
2635 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2636 | ||
a35b0d69 N |
2637 | static ssize_t |
2638 | size_show(mddev_t *mddev, char *page) | |
2639 | { | |
2640 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2641 | } | |
2642 | ||
2643 | static int update_size(mddev_t *mddev, unsigned long size); | |
2644 | ||
2645 | static ssize_t | |
2646 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2647 | { | |
2648 | /* If array is inactive, we can reduce the component size, but | |
2649 | * not increase it (except from 0). | |
2650 | * If array is active, we can try an on-line resize | |
2651 | */ | |
2652 | char *e; | |
2653 | int err = 0; | |
2654 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2655 | if (!*buf || *buf == '\n' || | |
2656 | (*e && *e != '\n')) | |
2657 | return -EINVAL; | |
2658 | ||
2659 | if (mddev->pers) { | |
2660 | err = update_size(mddev, size); | |
850b2b42 | 2661 | md_update_sb(mddev, 1); |
a35b0d69 N |
2662 | } else { |
2663 | if (mddev->size == 0 || | |
2664 | mddev->size > size) | |
2665 | mddev->size = size; | |
2666 | else | |
2667 | err = -ENOSPC; | |
2668 | } | |
2669 | return err ? err : len; | |
2670 | } | |
2671 | ||
2672 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 2673 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 2674 | |
8bb93aac N |
2675 | |
2676 | /* Metdata version. | |
2677 | * This is either 'none' for arrays with externally managed metadata, | |
2678 | * or N.M for internally known formats | |
2679 | */ | |
2680 | static ssize_t | |
2681 | metadata_show(mddev_t *mddev, char *page) | |
2682 | { | |
2683 | if (mddev->persistent) | |
2684 | return sprintf(page, "%d.%d\n", | |
2685 | mddev->major_version, mddev->minor_version); | |
2686 | else | |
2687 | return sprintf(page, "none\n"); | |
2688 | } | |
2689 | ||
2690 | static ssize_t | |
2691 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2692 | { | |
2693 | int major, minor; | |
2694 | char *e; | |
2695 | if (!list_empty(&mddev->disks)) | |
2696 | return -EBUSY; | |
2697 | ||
2698 | if (cmd_match(buf, "none")) { | |
2699 | mddev->persistent = 0; | |
2700 | mddev->major_version = 0; | |
2701 | mddev->minor_version = 90; | |
2702 | return len; | |
2703 | } | |
2704 | major = simple_strtoul(buf, &e, 10); | |
2705 | if (e==buf || *e != '.') | |
2706 | return -EINVAL; | |
2707 | buf = e+1; | |
2708 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 2709 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 2710 | return -EINVAL; |
50511da3 | 2711 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
2712 | return -ENOENT; |
2713 | mddev->major_version = major; | |
2714 | mddev->minor_version = minor; | |
2715 | mddev->persistent = 1; | |
2716 | return len; | |
2717 | } | |
2718 | ||
2719 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 2720 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 2721 | |
24dd469d | 2722 | static ssize_t |
7eec314d | 2723 | action_show(mddev_t *mddev, char *page) |
24dd469d | 2724 | { |
7eec314d | 2725 | char *type = "idle"; |
31399d9e N |
2726 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2727 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { | |
ccfcc3c1 N |
2728 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
2729 | type = "reshape"; | |
2730 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2731 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2732 | type = "resync"; | |
2733 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2734 | type = "check"; | |
2735 | else | |
2736 | type = "repair"; | |
2737 | } else | |
2738 | type = "recover"; | |
2739 | } | |
2740 | return sprintf(page, "%s\n", type); | |
2741 | } | |
2742 | ||
2743 | static ssize_t | |
7eec314d | 2744 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 2745 | { |
7eec314d N |
2746 | if (!mddev->pers || !mddev->pers->sync_request) |
2747 | return -EINVAL; | |
2748 | ||
bce74dac | 2749 | if (cmd_match(page, "idle")) { |
7eec314d N |
2750 | if (mddev->sync_thread) { |
2751 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2752 | md_unregister_thread(mddev->sync_thread); | |
2753 | mddev->sync_thread = NULL; | |
2754 | mddev->recovery = 0; | |
2755 | } | |
03c902e1 N |
2756 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2757 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 2758 | return -EBUSY; |
03c902e1 | 2759 | else if (cmd_match(page, "resync") || cmd_match(page, "recover")) |
7eec314d | 2760 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
16484bf5 N |
2761 | else if (cmd_match(page, "reshape")) { |
2762 | int err; | |
2763 | if (mddev->pers->start_reshape == NULL) | |
2764 | return -EINVAL; | |
2765 | err = mddev->pers->start_reshape(mddev); | |
2766 | if (err) | |
2767 | return err; | |
2768 | } else { | |
bce74dac | 2769 | if (cmd_match(page, "check")) |
7eec314d | 2770 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 2771 | else if (!cmd_match(page, "repair")) |
7eec314d N |
2772 | return -EINVAL; |
2773 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
2774 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 2775 | } |
03c902e1 | 2776 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d N |
2777 | md_wakeup_thread(mddev->thread); |
2778 | return len; | |
2779 | } | |
2780 | ||
9d88883e | 2781 | static ssize_t |
96de1e66 | 2782 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
2783 | { |
2784 | return sprintf(page, "%llu\n", | |
2785 | (unsigned long long) mddev->resync_mismatches); | |
2786 | } | |
2787 | ||
80ca3a44 N |
2788 | static struct md_sysfs_entry md_scan_mode = |
2789 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 2790 | |
96de1e66 | 2791 | |
80ca3a44 | 2792 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 2793 | |
88202a0c N |
2794 | static ssize_t |
2795 | sync_min_show(mddev_t *mddev, char *page) | |
2796 | { | |
2797 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
2798 | mddev->sync_speed_min ? "local": "system"); | |
2799 | } | |
2800 | ||
2801 | static ssize_t | |
2802 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
2803 | { | |
2804 | int min; | |
2805 | char *e; | |
2806 | if (strncmp(buf, "system", 6)==0) { | |
2807 | mddev->sync_speed_min = 0; | |
2808 | return len; | |
2809 | } | |
2810 | min = simple_strtoul(buf, &e, 10); | |
2811 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
2812 | return -EINVAL; | |
2813 | mddev->sync_speed_min = min; | |
2814 | return len; | |
2815 | } | |
2816 | ||
2817 | static struct md_sysfs_entry md_sync_min = | |
2818 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
2819 | ||
2820 | static ssize_t | |
2821 | sync_max_show(mddev_t *mddev, char *page) | |
2822 | { | |
2823 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
2824 | mddev->sync_speed_max ? "local": "system"); | |
2825 | } | |
2826 | ||
2827 | static ssize_t | |
2828 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
2829 | { | |
2830 | int max; | |
2831 | char *e; | |
2832 | if (strncmp(buf, "system", 6)==0) { | |
2833 | mddev->sync_speed_max = 0; | |
2834 | return len; | |
2835 | } | |
2836 | max = simple_strtoul(buf, &e, 10); | |
2837 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
2838 | return -EINVAL; | |
2839 | mddev->sync_speed_max = max; | |
2840 | return len; | |
2841 | } | |
2842 | ||
2843 | static struct md_sysfs_entry md_sync_max = | |
2844 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
2845 | ||
2846 | ||
2847 | static ssize_t | |
2848 | sync_speed_show(mddev_t *mddev, char *page) | |
2849 | { | |
2850 | unsigned long resync, dt, db; | |
ff4e8d9a | 2851 | resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)); |
88202a0c N |
2852 | dt = ((jiffies - mddev->resync_mark) / HZ); |
2853 | if (!dt) dt++; | |
2854 | db = resync - (mddev->resync_mark_cnt); | |
2855 | return sprintf(page, "%ld\n", db/dt/2); /* K/sec */ | |
2856 | } | |
2857 | ||
80ca3a44 | 2858 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
2859 | |
2860 | static ssize_t | |
2861 | sync_completed_show(mddev_t *mddev, char *page) | |
2862 | { | |
2863 | unsigned long max_blocks, resync; | |
2864 | ||
2865 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
2866 | max_blocks = mddev->resync_max_sectors; | |
2867 | else | |
2868 | max_blocks = mddev->size << 1; | |
2869 | ||
2870 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
2871 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
2872 | } | |
2873 | ||
80ca3a44 | 2874 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 2875 | |
e464eafd N |
2876 | static ssize_t |
2877 | suspend_lo_show(mddev_t *mddev, char *page) | |
2878 | { | |
2879 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
2880 | } | |
2881 | ||
2882 | static ssize_t | |
2883 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
2884 | { | |
2885 | char *e; | |
2886 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
2887 | ||
2888 | if (mddev->pers->quiesce == NULL) | |
2889 | return -EINVAL; | |
2890 | if (buf == e || (*e && *e != '\n')) | |
2891 | return -EINVAL; | |
2892 | if (new >= mddev->suspend_hi || | |
2893 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
2894 | mddev->suspend_lo = new; | |
2895 | mddev->pers->quiesce(mddev, 2); | |
2896 | return len; | |
2897 | } else | |
2898 | return -EINVAL; | |
2899 | } | |
2900 | static struct md_sysfs_entry md_suspend_lo = | |
2901 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
2902 | ||
2903 | ||
2904 | static ssize_t | |
2905 | suspend_hi_show(mddev_t *mddev, char *page) | |
2906 | { | |
2907 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
2908 | } | |
2909 | ||
2910 | static ssize_t | |
2911 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
2912 | { | |
2913 | char *e; | |
2914 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
2915 | ||
2916 | if (mddev->pers->quiesce == NULL) | |
2917 | return -EINVAL; | |
2918 | if (buf == e || (*e && *e != '\n')) | |
2919 | return -EINVAL; | |
2920 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
2921 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
2922 | mddev->suspend_hi = new; | |
2923 | mddev->pers->quiesce(mddev, 1); | |
2924 | mddev->pers->quiesce(mddev, 0); | |
2925 | return len; | |
2926 | } else | |
2927 | return -EINVAL; | |
2928 | } | |
2929 | static struct md_sysfs_entry md_suspend_hi = | |
2930 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
2931 | ||
08a02ecd N |
2932 | static ssize_t |
2933 | reshape_position_show(mddev_t *mddev, char *page) | |
2934 | { | |
2935 | if (mddev->reshape_position != MaxSector) | |
2936 | return sprintf(page, "%llu\n", | |
2937 | (unsigned long long)mddev->reshape_position); | |
2938 | strcpy(page, "none\n"); | |
2939 | return 5; | |
2940 | } | |
2941 | ||
2942 | static ssize_t | |
2943 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
2944 | { | |
2945 | char *e; | |
2946 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
2947 | if (mddev->pers) | |
2948 | return -EBUSY; | |
2949 | if (buf == e || (*e && *e != '\n')) | |
2950 | return -EINVAL; | |
2951 | mddev->reshape_position = new; | |
2952 | mddev->delta_disks = 0; | |
2953 | mddev->new_level = mddev->level; | |
2954 | mddev->new_layout = mddev->layout; | |
2955 | mddev->new_chunk = mddev->chunk_size; | |
2956 | return len; | |
2957 | } | |
2958 | ||
2959 | static struct md_sysfs_entry md_reshape_position = | |
2960 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
2961 | reshape_position_store); | |
2962 | ||
e464eafd | 2963 | |
eae1701f N |
2964 | static struct attribute *md_default_attrs[] = { |
2965 | &md_level.attr, | |
d4dbd025 | 2966 | &md_layout.attr, |
eae1701f | 2967 | &md_raid_disks.attr, |
3b34380a | 2968 | &md_chunk_size.attr, |
a35b0d69 | 2969 | &md_size.attr, |
a94213b1 | 2970 | &md_resync_start.attr, |
8bb93aac | 2971 | &md_metadata.attr, |
6d7ff738 | 2972 | &md_new_device.attr, |
16f17b39 | 2973 | &md_safe_delay.attr, |
9e653b63 | 2974 | &md_array_state.attr, |
08a02ecd | 2975 | &md_reshape_position.attr, |
411036fa N |
2976 | NULL, |
2977 | }; | |
2978 | ||
2979 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 2980 | &md_scan_mode.attr, |
9d88883e | 2981 | &md_mismatches.attr, |
88202a0c N |
2982 | &md_sync_min.attr, |
2983 | &md_sync_max.attr, | |
2984 | &md_sync_speed.attr, | |
2985 | &md_sync_completed.attr, | |
e464eafd N |
2986 | &md_suspend_lo.attr, |
2987 | &md_suspend_hi.attr, | |
9b1d1dac | 2988 | &md_bitmap.attr, |
eae1701f N |
2989 | NULL, |
2990 | }; | |
411036fa N |
2991 | static struct attribute_group md_redundancy_group = { |
2992 | .name = NULL, | |
2993 | .attrs = md_redundancy_attrs, | |
2994 | }; | |
2995 | ||
eae1701f N |
2996 | |
2997 | static ssize_t | |
2998 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2999 | { | |
3000 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3001 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3002 | ssize_t rv; |
eae1701f N |
3003 | |
3004 | if (!entry->show) | |
3005 | return -EIO; | |
5dc5cf7d IM |
3006 | rv = mddev_lock(mddev); |
3007 | if (!rv) { | |
3008 | rv = entry->show(mddev, page); | |
3009 | mddev_unlock(mddev); | |
3010 | } | |
96de1e66 | 3011 | return rv; |
eae1701f N |
3012 | } |
3013 | ||
3014 | static ssize_t | |
3015 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3016 | const char *page, size_t length) | |
3017 | { | |
3018 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3019 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3020 | ssize_t rv; |
eae1701f N |
3021 | |
3022 | if (!entry->store) | |
3023 | return -EIO; | |
67463acb N |
3024 | if (!capable(CAP_SYS_ADMIN)) |
3025 | return -EACCES; | |
5dc5cf7d IM |
3026 | rv = mddev_lock(mddev); |
3027 | if (!rv) { | |
3028 | rv = entry->store(mddev, page, length); | |
3029 | mddev_unlock(mddev); | |
3030 | } | |
96de1e66 | 3031 | return rv; |
eae1701f N |
3032 | } |
3033 | ||
3034 | static void md_free(struct kobject *ko) | |
3035 | { | |
3036 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
3037 | kfree(mddev); | |
3038 | } | |
3039 | ||
3040 | static struct sysfs_ops md_sysfs_ops = { | |
3041 | .show = md_attr_show, | |
3042 | .store = md_attr_store, | |
3043 | }; | |
3044 | static struct kobj_type md_ktype = { | |
3045 | .release = md_free, | |
3046 | .sysfs_ops = &md_sysfs_ops, | |
3047 | .default_attrs = md_default_attrs, | |
3048 | }; | |
3049 | ||
1da177e4 LT |
3050 | int mdp_major = 0; |
3051 | ||
3052 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3053 | { | |
48c9c27b | 3054 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3055 | mddev_t *mddev = mddev_find(dev); |
3056 | struct gendisk *disk; | |
3057 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
3058 | int shift = partitioned ? MdpMinorShift : 0; | |
3059 | int unit = MINOR(dev) >> shift; | |
3060 | ||
3061 | if (!mddev) | |
3062 | return NULL; | |
3063 | ||
48c9c27b | 3064 | mutex_lock(&disks_mutex); |
1da177e4 | 3065 | if (mddev->gendisk) { |
48c9c27b | 3066 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3067 | mddev_put(mddev); |
3068 | return NULL; | |
3069 | } | |
3070 | disk = alloc_disk(1 << shift); | |
3071 | if (!disk) { | |
48c9c27b | 3072 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3073 | mddev_put(mddev); |
3074 | return NULL; | |
3075 | } | |
3076 | disk->major = MAJOR(dev); | |
3077 | disk->first_minor = unit << shift; | |
ce7b0f46 | 3078 | if (partitioned) |
1da177e4 | 3079 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3080 | else |
1da177e4 | 3081 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3082 | disk->fops = &md_fops; |
3083 | disk->private_data = mddev; | |
3084 | disk->queue = mddev->queue; | |
3085 | add_disk(disk); | |
3086 | mddev->gendisk = disk; | |
48c9c27b | 3087 | mutex_unlock(&disks_mutex); |
9c791977 | 3088 | mddev->kobj.parent = &disk->kobj; |
eae1701f N |
3089 | mddev->kobj.k_name = NULL; |
3090 | snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); | |
3091 | mddev->kobj.ktype = &md_ktype; | |
5e55e2f5 N |
3092 | if (kobject_register(&mddev->kobj)) |
3093 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", | |
3094 | disk->disk_name); | |
1da177e4 LT |
3095 | return NULL; |
3096 | } | |
3097 | ||
1da177e4 LT |
3098 | static void md_safemode_timeout(unsigned long data) |
3099 | { | |
3100 | mddev_t *mddev = (mddev_t *) data; | |
3101 | ||
3102 | mddev->safemode = 1; | |
3103 | md_wakeup_thread(mddev->thread); | |
3104 | } | |
3105 | ||
6ff8d8ec | 3106 | static int start_dirty_degraded; |
1da177e4 LT |
3107 | |
3108 | static int do_md_run(mddev_t * mddev) | |
3109 | { | |
2604b703 | 3110 | int err; |
1da177e4 LT |
3111 | int chunk_size; |
3112 | struct list_head *tmp; | |
3113 | mdk_rdev_t *rdev; | |
3114 | struct gendisk *disk; | |
2604b703 | 3115 | struct mdk_personality *pers; |
1da177e4 LT |
3116 | char b[BDEVNAME_SIZE]; |
3117 | ||
a757e64c N |
3118 | if (list_empty(&mddev->disks)) |
3119 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3120 | return -EINVAL; |
1da177e4 LT |
3121 | |
3122 | if (mddev->pers) | |
3123 | return -EBUSY; | |
3124 | ||
3125 | /* | |
3126 | * Analyze all RAID superblock(s) | |
3127 | */ | |
a757e64c N |
3128 | if (!mddev->raid_disks) |
3129 | analyze_sbs(mddev); | |
1da177e4 LT |
3130 | |
3131 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3132 | |
3133 | if (chunk_size) { | |
1da177e4 LT |
3134 | if (chunk_size > MAX_CHUNK_SIZE) { |
3135 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3136 | chunk_size, MAX_CHUNK_SIZE); | |
3137 | return -EINVAL; | |
3138 | } | |
3139 | /* | |
3140 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
3141 | */ | |
3142 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3143 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3144 | return -EINVAL; |
3145 | } | |
3146 | if (chunk_size < PAGE_SIZE) { | |
3147 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
3148 | chunk_size, PAGE_SIZE); | |
3149 | return -EINVAL; | |
3150 | } | |
3151 | ||
3152 | /* devices must have minimum size of one chunk */ | |
3153 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 3154 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3155 | continue; |
3156 | if (rdev->size < chunk_size / 1024) { | |
3157 | printk(KERN_WARNING | |
3158 | "md: Dev %s smaller than chunk_size:" | |
3159 | " %lluk < %dk\n", | |
3160 | bdevname(rdev->bdev,b), | |
3161 | (unsigned long long)rdev->size, | |
3162 | chunk_size / 1024); | |
3163 | return -EINVAL; | |
3164 | } | |
3165 | } | |
3166 | } | |
3167 | ||
1da177e4 | 3168 | #ifdef CONFIG_KMOD |
d9d166c2 N |
3169 | if (mddev->level != LEVEL_NONE) |
3170 | request_module("md-level-%d", mddev->level); | |
3171 | else if (mddev->clevel[0]) | |
3172 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3173 | #endif |
3174 | ||
3175 | /* | |
3176 | * Drop all container device buffers, from now on | |
3177 | * the only valid external interface is through the md | |
3178 | * device. | |
1da177e4 LT |
3179 | */ |
3180 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 3181 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3182 | continue; |
3183 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3184 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3185 | |
3186 | /* perform some consistency tests on the device. | |
3187 | * We don't want the data to overlap the metadata, | |
3188 | * Internal Bitmap issues has handled elsewhere. | |
3189 | */ | |
3190 | if (rdev->data_offset < rdev->sb_offset) { | |
3191 | if (mddev->size && | |
3192 | rdev->data_offset + mddev->size*2 | |
3193 | > rdev->sb_offset*2) { | |
3194 | printk("md: %s: data overlaps metadata\n", | |
3195 | mdname(mddev)); | |
3196 | return -EINVAL; | |
3197 | } | |
3198 | } else { | |
3199 | if (rdev->sb_offset*2 + rdev->sb_size/512 | |
3200 | > rdev->data_offset) { | |
3201 | printk("md: %s: metadata overlaps data\n", | |
3202 | mdname(mddev)); | |
3203 | return -EINVAL; | |
3204 | } | |
3205 | } | |
1da177e4 LT |
3206 | } |
3207 | ||
3208 | md_probe(mddev->unit, NULL, NULL); | |
3209 | disk = mddev->gendisk; | |
3210 | if (!disk) | |
3211 | return -ENOMEM; | |
3212 | ||
3213 | spin_lock(&pers_lock); | |
d9d166c2 | 3214 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3215 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3216 | spin_unlock(&pers_lock); |
d9d166c2 N |
3217 | if (mddev->level != LEVEL_NONE) |
3218 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3219 | mddev->level); | |
3220 | else | |
3221 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3222 | mddev->clevel); | |
1da177e4 LT |
3223 | return -EINVAL; |
3224 | } | |
2604b703 | 3225 | mddev->pers = pers; |
1da177e4 | 3226 | spin_unlock(&pers_lock); |
d9d166c2 N |
3227 | mddev->level = pers->level; |
3228 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3229 | |
f6705578 | 3230 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3231 | pers->start_reshape == NULL) { |
f6705578 N |
3232 | /* This personality cannot handle reshaping... */ |
3233 | mddev->pers = NULL; | |
3234 | module_put(pers->owner); | |
3235 | return -EINVAL; | |
3236 | } | |
3237 | ||
7dd5e7c3 N |
3238 | if (pers->sync_request) { |
3239 | /* Warn if this is a potentially silly | |
3240 | * configuration. | |
3241 | */ | |
3242 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3243 | mdk_rdev_t *rdev2; | |
3244 | struct list_head *tmp2; | |
3245 | int warned = 0; | |
3246 | ITERATE_RDEV(mddev, rdev, tmp) { | |
3247 | ITERATE_RDEV(mddev, rdev2, tmp2) { | |
3248 | if (rdev < rdev2 && | |
3249 | rdev->bdev->bd_contains == | |
3250 | rdev2->bdev->bd_contains) { | |
3251 | printk(KERN_WARNING | |
3252 | "%s: WARNING: %s appears to be" | |
3253 | " on the same physical disk as" | |
3254 | " %s.\n", | |
3255 | mdname(mddev), | |
3256 | bdevname(rdev->bdev,b), | |
3257 | bdevname(rdev2->bdev,b2)); | |
3258 | warned = 1; | |
3259 | } | |
3260 | } | |
3261 | } | |
3262 | if (warned) | |
3263 | printk(KERN_WARNING | |
3264 | "True protection against single-disk" | |
3265 | " failure might be compromised.\n"); | |
3266 | } | |
3267 | ||
657390d2 | 3268 | mddev->recovery = 0; |
1da177e4 | 3269 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3270 | mddev->barriers_work = 1; |
6ff8d8ec | 3271 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3272 | |
f91de92e N |
3273 | if (start_readonly) |
3274 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3275 | ||
b15c2e57 N |
3276 | err = mddev->pers->run(mddev); |
3277 | if (!err && mddev->pers->sync_request) { | |
3278 | err = bitmap_create(mddev); | |
3279 | if (err) { | |
3280 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3281 | mdname(mddev), err); | |
3282 | mddev->pers->stop(mddev); | |
3283 | } | |
3284 | } | |
1da177e4 LT |
3285 | if (err) { |
3286 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3287 | module_put(mddev->pers->owner); | |
3288 | mddev->pers = NULL; | |
32a7627c N |
3289 | bitmap_destroy(mddev); |
3290 | return err; | |
1da177e4 | 3291 | } |
5e55e2f5 N |
3292 | if (mddev->pers->sync_request) { |
3293 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3294 | printk(KERN_WARNING | |
3295 | "md: cannot register extra attributes for %s\n", | |
3296 | mdname(mddev)); | |
3297 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ | |
fd9d49ca N |
3298 | mddev->ro = 0; |
3299 | ||
1da177e4 LT |
3300 | atomic_set(&mddev->writes_pending,0); |
3301 | mddev->safemode = 0; | |
3302 | mddev->safemode_timer.function = md_safemode_timeout; | |
3303 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3304 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3305 | mddev->in_sync = 1; |
86e6ffdd N |
3306 | |
3307 | ITERATE_RDEV(mddev,rdev,tmp) | |
3308 | if (rdev->raid_disk >= 0) { | |
3309 | char nm[20]; | |
3310 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3311 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3312 | printk("md: cannot register %s for %s\n", | |
3313 | nm, mdname(mddev)); | |
86e6ffdd | 3314 | } |
1da177e4 LT |
3315 | |
3316 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3317 | ||
850b2b42 N |
3318 | if (mddev->flags) |
3319 | md_update_sb(mddev, 0); | |
1da177e4 LT |
3320 | |
3321 | set_capacity(disk, mddev->array_size<<1); | |
3322 | ||
3323 | /* If we call blk_queue_make_request here, it will | |
3324 | * re-initialise max_sectors etc which may have been | |
3325 | * refined inside -> run. So just set the bits we need to set. | |
3326 | * Most initialisation happended when we called | |
3327 | * blk_queue_make_request(..., md_fail_request) | |
3328 | * earlier. | |
3329 | */ | |
3330 | mddev->queue->queuedata = mddev; | |
3331 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3332 | ||
5fd6c1dc N |
3333 | /* If there is a partially-recovered drive we need to |
3334 | * start recovery here. If we leave it to md_check_recovery, | |
3335 | * it will remove the drives and not do the right thing | |
3336 | */ | |
0b8c9de0 | 3337 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc N |
3338 | struct list_head *rtmp; |
3339 | int spares = 0; | |
3340 | ITERATE_RDEV(mddev,rdev,rtmp) | |
3341 | if (rdev->raid_disk >= 0 && | |
3342 | !test_bit(In_sync, &rdev->flags) && | |
3343 | !test_bit(Faulty, &rdev->flags)) | |
3344 | /* complete an interrupted recovery */ | |
3345 | spares++; | |
3346 | if (spares && mddev->pers->sync_request) { | |
3347 | mddev->recovery = 0; | |
3348 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3349 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3350 | mddev, | |
3351 | "%s_resync"); | |
3352 | if (!mddev->sync_thread) { | |
3353 | printk(KERN_ERR "%s: could not start resync" | |
3354 | " thread...\n", | |
3355 | mdname(mddev)); | |
3356 | /* leave the spares where they are, it shouldn't hurt */ | |
3357 | mddev->recovery = 0; | |
0b8c9de0 | 3358 | } |
5fd6c1dc N |
3359 | } |
3360 | } | |
0b8c9de0 N |
3361 | md_wakeup_thread(mddev->thread); |
3362 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3363 | |
44ce6294 | 3364 | mddev->changed = 1; |
d7603b7e | 3365 | md_new_event(mddev); |
2f471303 | 3366 | kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE); |
1da177e4 LT |
3367 | return 0; |
3368 | } | |
3369 | ||
3370 | static int restart_array(mddev_t *mddev) | |
3371 | { | |
3372 | struct gendisk *disk = mddev->gendisk; | |
3373 | int err; | |
3374 | ||
3375 | /* | |
3376 | * Complain if it has no devices | |
3377 | */ | |
3378 | err = -ENXIO; | |
3379 | if (list_empty(&mddev->disks)) | |
3380 | goto out; | |
3381 | ||
3382 | if (mddev->pers) { | |
3383 | err = -EBUSY; | |
3384 | if (!mddev->ro) | |
3385 | goto out; | |
3386 | ||
3387 | mddev->safemode = 0; | |
3388 | mddev->ro = 0; | |
3389 | set_disk_ro(disk, 0); | |
3390 | ||
3391 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3392 | mdname(mddev)); | |
3393 | /* | |
3394 | * Kick recovery or resync if necessary | |
3395 | */ | |
3396 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3397 | md_wakeup_thread(mddev->thread); | |
5fd6c1dc | 3398 | md_wakeup_thread(mddev->sync_thread); |
1da177e4 | 3399 | err = 0; |
9e653b63 | 3400 | } else |
1da177e4 | 3401 | err = -EINVAL; |
1da177e4 LT |
3402 | |
3403 | out: | |
3404 | return err; | |
3405 | } | |
3406 | ||
acc55e22 N |
3407 | /* similar to deny_write_access, but accounts for our holding a reference |
3408 | * to the file ourselves */ | |
3409 | static int deny_bitmap_write_access(struct file * file) | |
3410 | { | |
3411 | struct inode *inode = file->f_mapping->host; | |
3412 | ||
3413 | spin_lock(&inode->i_lock); | |
3414 | if (atomic_read(&inode->i_writecount) > 1) { | |
3415 | spin_unlock(&inode->i_lock); | |
3416 | return -ETXTBSY; | |
3417 | } | |
3418 | atomic_set(&inode->i_writecount, -1); | |
3419 | spin_unlock(&inode->i_lock); | |
3420 | ||
3421 | return 0; | |
3422 | } | |
3423 | ||
3424 | static void restore_bitmap_write_access(struct file *file) | |
3425 | { | |
3426 | struct inode *inode = file->f_mapping->host; | |
3427 | ||
3428 | spin_lock(&inode->i_lock); | |
3429 | atomic_set(&inode->i_writecount, 1); | |
3430 | spin_unlock(&inode->i_lock); | |
3431 | } | |
3432 | ||
9e653b63 N |
3433 | /* mode: |
3434 | * 0 - completely stop and dis-assemble array | |
3435 | * 1 - switch to readonly | |
3436 | * 2 - stop but do not disassemble array | |
3437 | */ | |
3438 | static int do_md_stop(mddev_t * mddev, int mode) | |
1da177e4 LT |
3439 | { |
3440 | int err = 0; | |
3441 | struct gendisk *disk = mddev->gendisk; | |
3442 | ||
3443 | if (mddev->pers) { | |
3444 | if (atomic_read(&mddev->active)>2) { | |
3445 | printk("md: %s still in use.\n",mdname(mddev)); | |
3446 | return -EBUSY; | |
3447 | } | |
3448 | ||
3449 | if (mddev->sync_thread) { | |
5fd6c1dc | 3450 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3451 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3452 | md_unregister_thread(mddev->sync_thread); | |
3453 | mddev->sync_thread = NULL; | |
3454 | } | |
3455 | ||
3456 | del_timer_sync(&mddev->safemode_timer); | |
3457 | ||
3458 | invalidate_partition(disk, 0); | |
3459 | ||
9e653b63 N |
3460 | switch(mode) { |
3461 | case 1: /* readonly */ | |
1da177e4 | 3462 | err = -ENXIO; |
f91de92e | 3463 | if (mddev->ro==1) |
1da177e4 LT |
3464 | goto out; |
3465 | mddev->ro = 1; | |
9e653b63 N |
3466 | break; |
3467 | case 0: /* disassemble */ | |
3468 | case 2: /* stop */ | |
6b8b3e8a | 3469 | bitmap_flush(mddev); |
a9701a30 | 3470 | md_super_wait(mddev); |
1da177e4 LT |
3471 | if (mddev->ro) |
3472 | set_disk_ro(disk, 0); | |
3473 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3474 | mddev->pers->stop(mddev); | |
d1b5380c N |
3475 | mddev->queue->merge_bvec_fn = NULL; |
3476 | mddev->queue->unplug_fn = NULL; | |
3477 | mddev->queue->issue_flush_fn = NULL; | |
041ae52e | 3478 | mddev->queue->backing_dev_info.congested_fn = NULL; |
411036fa N |
3479 | if (mddev->pers->sync_request) |
3480 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
3481 | ||
1da177e4 LT |
3482 | module_put(mddev->pers->owner); |
3483 | mddev->pers = NULL; | |
0d4ca600 N |
3484 | |
3485 | set_capacity(disk, 0); | |
44ce6294 | 3486 | mddev->changed = 1; |
0d4ca600 | 3487 | |
1da177e4 LT |
3488 | if (mddev->ro) |
3489 | mddev->ro = 0; | |
3490 | } | |
850b2b42 | 3491 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
3492 | /* mark array as shutdown cleanly */ |
3493 | mddev->in_sync = 1; | |
850b2b42 | 3494 | md_update_sb(mddev, 1); |
1da177e4 | 3495 | } |
9e653b63 | 3496 | if (mode == 1) |
1da177e4 | 3497 | set_disk_ro(disk, 1); |
5fd6c1dc | 3498 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3499 | } |
32a7627c | 3500 | |
1da177e4 LT |
3501 | /* |
3502 | * Free resources if final stop | |
3503 | */ | |
9e653b63 | 3504 | if (mode == 0) { |
86e6ffdd N |
3505 | mdk_rdev_t *rdev; |
3506 | struct list_head *tmp; | |
0d4ca600 | 3507 | |
1da177e4 LT |
3508 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
3509 | ||
978f946b N |
3510 | bitmap_destroy(mddev); |
3511 | if (mddev->bitmap_file) { | |
acc55e22 | 3512 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3513 | fput(mddev->bitmap_file); |
3514 | mddev->bitmap_file = NULL; | |
3515 | } | |
3516 | mddev->bitmap_offset = 0; | |
3517 | ||
86e6ffdd N |
3518 | ITERATE_RDEV(mddev,rdev,tmp) |
3519 | if (rdev->raid_disk >= 0) { | |
3520 | char nm[20]; | |
3521 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3522 | sysfs_remove_link(&mddev->kobj, nm); | |
3523 | } | |
3524 | ||
5792a285 N |
3525 | /* make sure all delayed_delete calls have finished */ |
3526 | flush_scheduled_work(); | |
3527 | ||
1da177e4 LT |
3528 | export_array(mddev); |
3529 | ||
3530 | mddev->array_size = 0; | |
9e653b63 N |
3531 | mddev->size = 0; |
3532 | mddev->raid_disks = 0; | |
a94213b1 | 3533 | mddev->recovery_cp = 0; |
08a02ecd | 3534 | mddev->reshape_position = MaxSector; |
9e653b63 | 3535 | |
a8a55c38 | 3536 | } else if (mddev->pers) |
1da177e4 LT |
3537 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
3538 | mdname(mddev)); | |
3539 | err = 0; | |
d7603b7e | 3540 | md_new_event(mddev); |
1da177e4 LT |
3541 | out: |
3542 | return err; | |
3543 | } | |
3544 | ||
fdee8ae4 | 3545 | #ifndef MODULE |
1da177e4 LT |
3546 | static void autorun_array(mddev_t *mddev) |
3547 | { | |
3548 | mdk_rdev_t *rdev; | |
3549 | struct list_head *tmp; | |
3550 | int err; | |
3551 | ||
a757e64c | 3552 | if (list_empty(&mddev->disks)) |
1da177e4 | 3553 | return; |
1da177e4 LT |
3554 | |
3555 | printk(KERN_INFO "md: running: "); | |
3556 | ||
3557 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3558 | char b[BDEVNAME_SIZE]; | |
3559 | printk("<%s>", bdevname(rdev->bdev,b)); | |
3560 | } | |
3561 | printk("\n"); | |
3562 | ||
3563 | err = do_md_run (mddev); | |
3564 | if (err) { | |
3565 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
3566 | do_md_stop (mddev, 0); | |
3567 | } | |
3568 | } | |
3569 | ||
3570 | /* | |
3571 | * lets try to run arrays based on all disks that have arrived | |
3572 | * until now. (those are in pending_raid_disks) | |
3573 | * | |
3574 | * the method: pick the first pending disk, collect all disks with | |
3575 | * the same UUID, remove all from the pending list and put them into | |
3576 | * the 'same_array' list. Then order this list based on superblock | |
3577 | * update time (freshest comes first), kick out 'old' disks and | |
3578 | * compare superblocks. If everything's fine then run it. | |
3579 | * | |
3580 | * If "unit" is allocated, then bump its reference count | |
3581 | */ | |
3582 | static void autorun_devices(int part) | |
3583 | { | |
1da177e4 LT |
3584 | struct list_head *tmp; |
3585 | mdk_rdev_t *rdev0, *rdev; | |
3586 | mddev_t *mddev; | |
3587 | char b[BDEVNAME_SIZE]; | |
3588 | ||
3589 | printk(KERN_INFO "md: autorun ...\n"); | |
3590 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 3591 | int unit; |
1da177e4 | 3592 | dev_t dev; |
ad01c9e3 | 3593 | LIST_HEAD(candidates); |
1da177e4 LT |
3594 | rdev0 = list_entry(pending_raid_disks.next, |
3595 | mdk_rdev_t, same_set); | |
3596 | ||
3597 | printk(KERN_INFO "md: considering %s ...\n", | |
3598 | bdevname(rdev0->bdev,b)); | |
3599 | INIT_LIST_HEAD(&candidates); | |
3600 | ITERATE_RDEV_PENDING(rdev,tmp) | |
3601 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
3602 | printk(KERN_INFO "md: adding %s ...\n", | |
3603 | bdevname(rdev->bdev,b)); | |
3604 | list_move(&rdev->same_set, &candidates); | |
3605 | } | |
3606 | /* | |
3607 | * now we have a set of devices, with all of them having | |
3608 | * mostly sane superblocks. It's time to allocate the | |
3609 | * mddev. | |
3610 | */ | |
e8703fe1 N |
3611 | if (part) { |
3612 | dev = MKDEV(mdp_major, | |
3613 | rdev0->preferred_minor << MdpMinorShift); | |
3614 | unit = MINOR(dev) >> MdpMinorShift; | |
3615 | } else { | |
3616 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
3617 | unit = MINOR(dev); | |
3618 | } | |
3619 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
3620 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
3621 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
3622 | break; | |
3623 | } | |
1da177e4 LT |
3624 | |
3625 | md_probe(dev, NULL, NULL); | |
3626 | mddev = mddev_find(dev); | |
3627 | if (!mddev) { | |
3628 | printk(KERN_ERR | |
3629 | "md: cannot allocate memory for md drive.\n"); | |
3630 | break; | |
3631 | } | |
3632 | if (mddev_lock(mddev)) | |
3633 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
3634 | mdname(mddev)); | |
3635 | else if (mddev->raid_disks || mddev->major_version | |
3636 | || !list_empty(&mddev->disks)) { | |
3637 | printk(KERN_WARNING | |
3638 | "md: %s already running, cannot run %s\n", | |
3639 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
3640 | mddev_unlock(mddev); | |
3641 | } else { | |
3642 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
3643 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
3644 | list_del_init(&rdev->same_set); | |
3645 | if (bind_rdev_to_array(rdev, mddev)) | |
3646 | export_rdev(rdev); | |
3647 | } | |
3648 | autorun_array(mddev); | |
3649 | mddev_unlock(mddev); | |
3650 | } | |
3651 | /* on success, candidates will be empty, on error | |
3652 | * it won't... | |
3653 | */ | |
3654 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
3655 | export_rdev(rdev); | |
3656 | mddev_put(mddev); | |
3657 | } | |
3658 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
3659 | } | |
fdee8ae4 | 3660 | #endif /* !MODULE */ |
1da177e4 | 3661 | |
1da177e4 LT |
3662 | static int get_version(void __user * arg) |
3663 | { | |
3664 | mdu_version_t ver; | |
3665 | ||
3666 | ver.major = MD_MAJOR_VERSION; | |
3667 | ver.minor = MD_MINOR_VERSION; | |
3668 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
3669 | ||
3670 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
3671 | return -EFAULT; | |
3672 | ||
3673 | return 0; | |
3674 | } | |
3675 | ||
3676 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
3677 | { | |
3678 | mdu_array_info_t info; | |
3679 | int nr,working,active,failed,spare; | |
3680 | mdk_rdev_t *rdev; | |
3681 | struct list_head *tmp; | |
3682 | ||
3683 | nr=working=active=failed=spare=0; | |
3684 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3685 | nr++; | |
b2d444d7 | 3686 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3687 | failed++; |
3688 | else { | |
3689 | working++; | |
b2d444d7 | 3690 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
3691 | active++; |
3692 | else | |
3693 | spare++; | |
3694 | } | |
3695 | } | |
3696 | ||
3697 | info.major_version = mddev->major_version; | |
3698 | info.minor_version = mddev->minor_version; | |
3699 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
3700 | info.ctime = mddev->ctime; | |
3701 | info.level = mddev->level; | |
3702 | info.size = mddev->size; | |
284ae7ca N |
3703 | if (info.size != mddev->size) /* overflow */ |
3704 | info.size = -1; | |
1da177e4 LT |
3705 | info.nr_disks = nr; |
3706 | info.raid_disks = mddev->raid_disks; | |
3707 | info.md_minor = mddev->md_minor; | |
3708 | info.not_persistent= !mddev->persistent; | |
3709 | ||
3710 | info.utime = mddev->utime; | |
3711 | info.state = 0; | |
3712 | if (mddev->in_sync) | |
3713 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
3714 | if (mddev->bitmap && mddev->bitmap_offset) |
3715 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3716 | info.active_disks = active; |
3717 | info.working_disks = working; | |
3718 | info.failed_disks = failed; | |
3719 | info.spare_disks = spare; | |
3720 | ||
3721 | info.layout = mddev->layout; | |
3722 | info.chunk_size = mddev->chunk_size; | |
3723 | ||
3724 | if (copy_to_user(arg, &info, sizeof(info))) | |
3725 | return -EFAULT; | |
3726 | ||
3727 | return 0; | |
3728 | } | |
3729 | ||
87162a28 | 3730 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
3731 | { |
3732 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
3733 | char *ptr, *buf = NULL; | |
3734 | int err = -ENOMEM; | |
3735 | ||
2a2275d6 N |
3736 | md_allow_write(mddev); |
3737 | ||
32a7627c N |
3738 | file = kmalloc(sizeof(*file), GFP_KERNEL); |
3739 | if (!file) | |
3740 | goto out; | |
3741 | ||
3742 | /* bitmap disabled, zero the first byte and copy out */ | |
3743 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
3744 | file->pathname[0] = '\0'; | |
3745 | goto copy_out; | |
3746 | } | |
3747 | ||
3748 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
3749 | if (!buf) | |
3750 | goto out; | |
3751 | ||
3752 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
3753 | if (!ptr) | |
3754 | goto out; | |
3755 | ||
3756 | strcpy(file->pathname, ptr); | |
3757 | ||
3758 | copy_out: | |
3759 | err = 0; | |
3760 | if (copy_to_user(arg, file, sizeof(*file))) | |
3761 | err = -EFAULT; | |
3762 | out: | |
3763 | kfree(buf); | |
3764 | kfree(file); | |
3765 | return err; | |
3766 | } | |
3767 | ||
1da177e4 LT |
3768 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
3769 | { | |
3770 | mdu_disk_info_t info; | |
3771 | unsigned int nr; | |
3772 | mdk_rdev_t *rdev; | |
3773 | ||
3774 | if (copy_from_user(&info, arg, sizeof(info))) | |
3775 | return -EFAULT; | |
3776 | ||
3777 | nr = info.number; | |
3778 | ||
3779 | rdev = find_rdev_nr(mddev, nr); | |
3780 | if (rdev) { | |
3781 | info.major = MAJOR(rdev->bdev->bd_dev); | |
3782 | info.minor = MINOR(rdev->bdev->bd_dev); | |
3783 | info.raid_disk = rdev->raid_disk; | |
3784 | info.state = 0; | |
b2d444d7 | 3785 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3786 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 3787 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
3788 | info.state |= (1<<MD_DISK_ACTIVE); |
3789 | info.state |= (1<<MD_DISK_SYNC); | |
3790 | } | |
8ddf9efe N |
3791 | if (test_bit(WriteMostly, &rdev->flags)) |
3792 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
3793 | } else { |
3794 | info.major = info.minor = 0; | |
3795 | info.raid_disk = -1; | |
3796 | info.state = (1<<MD_DISK_REMOVED); | |
3797 | } | |
3798 | ||
3799 | if (copy_to_user(arg, &info, sizeof(info))) | |
3800 | return -EFAULT; | |
3801 | ||
3802 | return 0; | |
3803 | } | |
3804 | ||
3805 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
3806 | { | |
3807 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3808 | mdk_rdev_t *rdev; | |
3809 | dev_t dev = MKDEV(info->major,info->minor); | |
3810 | ||
3811 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
3812 | return -EOVERFLOW; | |
3813 | ||
3814 | if (!mddev->raid_disks) { | |
3815 | int err; | |
3816 | /* expecting a device which has a superblock */ | |
3817 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
3818 | if (IS_ERR(rdev)) { | |
3819 | printk(KERN_WARNING | |
3820 | "md: md_import_device returned %ld\n", | |
3821 | PTR_ERR(rdev)); | |
3822 | return PTR_ERR(rdev); | |
3823 | } | |
3824 | if (!list_empty(&mddev->disks)) { | |
3825 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3826 | mdk_rdev_t, same_set); | |
3827 | int err = super_types[mddev->major_version] | |
3828 | .load_super(rdev, rdev0, mddev->minor_version); | |
3829 | if (err < 0) { | |
3830 | printk(KERN_WARNING | |
3831 | "md: %s has different UUID to %s\n", | |
3832 | bdevname(rdev->bdev,b), | |
3833 | bdevname(rdev0->bdev,b2)); | |
3834 | export_rdev(rdev); | |
3835 | return -EINVAL; | |
3836 | } | |
3837 | } | |
3838 | err = bind_rdev_to_array(rdev, mddev); | |
3839 | if (err) | |
3840 | export_rdev(rdev); | |
3841 | return err; | |
3842 | } | |
3843 | ||
3844 | /* | |
3845 | * add_new_disk can be used once the array is assembled | |
3846 | * to add "hot spares". They must already have a superblock | |
3847 | * written | |
3848 | */ | |
3849 | if (mddev->pers) { | |
3850 | int err; | |
3851 | if (!mddev->pers->hot_add_disk) { | |
3852 | printk(KERN_WARNING | |
3853 | "%s: personality does not support diskops!\n", | |
3854 | mdname(mddev)); | |
3855 | return -EINVAL; | |
3856 | } | |
7b1e35f6 N |
3857 | if (mddev->persistent) |
3858 | rdev = md_import_device(dev, mddev->major_version, | |
3859 | mddev->minor_version); | |
3860 | else | |
3861 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
3862 | if (IS_ERR(rdev)) { |
3863 | printk(KERN_WARNING | |
3864 | "md: md_import_device returned %ld\n", | |
3865 | PTR_ERR(rdev)); | |
3866 | return PTR_ERR(rdev); | |
3867 | } | |
41158c7e N |
3868 | /* set save_raid_disk if appropriate */ |
3869 | if (!mddev->persistent) { | |
3870 | if (info->state & (1<<MD_DISK_SYNC) && | |
3871 | info->raid_disk < mddev->raid_disks) | |
3872 | rdev->raid_disk = info->raid_disk; | |
3873 | else | |
3874 | rdev->raid_disk = -1; | |
3875 | } else | |
3876 | super_types[mddev->major_version]. | |
3877 | validate_super(mddev, rdev); | |
3878 | rdev->saved_raid_disk = rdev->raid_disk; | |
3879 | ||
b2d444d7 | 3880 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
3881 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
3882 | set_bit(WriteMostly, &rdev->flags); | |
3883 | ||
1da177e4 LT |
3884 | rdev->raid_disk = -1; |
3885 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
3886 | if (!err && !mddev->pers->hot_remove_disk) { |
3887 | /* If there is hot_add_disk but no hot_remove_disk | |
3888 | * then added disks for geometry changes, | |
3889 | * and should be added immediately. | |
3890 | */ | |
3891 | super_types[mddev->major_version]. | |
3892 | validate_super(mddev, rdev); | |
3893 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
3894 | if (err) | |
3895 | unbind_rdev_from_array(rdev); | |
3896 | } | |
1da177e4 LT |
3897 | if (err) |
3898 | export_rdev(rdev); | |
c361777f | 3899 | |
17571284 | 3900 | md_update_sb(mddev, 1); |
c361777f | 3901 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 3902 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
3903 | return err; |
3904 | } | |
3905 | ||
3906 | /* otherwise, add_new_disk is only allowed | |
3907 | * for major_version==0 superblocks | |
3908 | */ | |
3909 | if (mddev->major_version != 0) { | |
3910 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
3911 | mdname(mddev)); | |
3912 | return -EINVAL; | |
3913 | } | |
3914 | ||
3915 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
3916 | int err; | |
3917 | rdev = md_import_device (dev, -1, 0); | |
3918 | if (IS_ERR(rdev)) { | |
3919 | printk(KERN_WARNING | |
3920 | "md: error, md_import_device() returned %ld\n", | |
3921 | PTR_ERR(rdev)); | |
3922 | return PTR_ERR(rdev); | |
3923 | } | |
3924 | rdev->desc_nr = info->number; | |
3925 | if (info->raid_disk < mddev->raid_disks) | |
3926 | rdev->raid_disk = info->raid_disk; | |
3927 | else | |
3928 | rdev->raid_disk = -1; | |
3929 | ||
b2d444d7 N |
3930 | rdev->flags = 0; |
3931 | ||
1da177e4 | 3932 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
3933 | if (info->state & (1<<MD_DISK_SYNC)) |
3934 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 3935 | |
8ddf9efe N |
3936 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
3937 | set_bit(WriteMostly, &rdev->flags); | |
3938 | ||
1da177e4 LT |
3939 | if (!mddev->persistent) { |
3940 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
3941 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
3942 | } else | |
3943 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
3944 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
3945 | ||
2bf071bf N |
3946 | err = bind_rdev_to_array(rdev, mddev); |
3947 | if (err) { | |
3948 | export_rdev(rdev); | |
3949 | return err; | |
3950 | } | |
1da177e4 LT |
3951 | } |
3952 | ||
3953 | return 0; | |
3954 | } | |
3955 | ||
3956 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
3957 | { | |
3958 | char b[BDEVNAME_SIZE]; | |
3959 | mdk_rdev_t *rdev; | |
3960 | ||
3961 | if (!mddev->pers) | |
3962 | return -ENODEV; | |
3963 | ||
3964 | rdev = find_rdev(mddev, dev); | |
3965 | if (!rdev) | |
3966 | return -ENXIO; | |
3967 | ||
3968 | if (rdev->raid_disk >= 0) | |
3969 | goto busy; | |
3970 | ||
3971 | kick_rdev_from_array(rdev); | |
850b2b42 | 3972 | md_update_sb(mddev, 1); |
d7603b7e | 3973 | md_new_event(mddev); |
1da177e4 LT |
3974 | |
3975 | return 0; | |
3976 | busy: | |
3977 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
3978 | bdevname(rdev->bdev,b), mdname(mddev)); | |
3979 | return -EBUSY; | |
3980 | } | |
3981 | ||
3982 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
3983 | { | |
3984 | char b[BDEVNAME_SIZE]; | |
3985 | int err; | |
3986 | unsigned int size; | |
3987 | mdk_rdev_t *rdev; | |
3988 | ||
3989 | if (!mddev->pers) | |
3990 | return -ENODEV; | |
3991 | ||
3992 | if (mddev->major_version != 0) { | |
3993 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
3994 | " version-0 superblocks.\n", | |
3995 | mdname(mddev)); | |
3996 | return -EINVAL; | |
3997 | } | |
3998 | if (!mddev->pers->hot_add_disk) { | |
3999 | printk(KERN_WARNING | |
4000 | "%s: personality does not support diskops!\n", | |
4001 | mdname(mddev)); | |
4002 | return -EINVAL; | |
4003 | } | |
4004 | ||
4005 | rdev = md_import_device (dev, -1, 0); | |
4006 | if (IS_ERR(rdev)) { | |
4007 | printk(KERN_WARNING | |
4008 | "md: error, md_import_device() returned %ld\n", | |
4009 | PTR_ERR(rdev)); | |
4010 | return -EINVAL; | |
4011 | } | |
4012 | ||
4013 | if (mddev->persistent) | |
4014 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
4015 | else | |
4016 | rdev->sb_offset = | |
4017 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
4018 | ||
4019 | size = calc_dev_size(rdev, mddev->chunk_size); | |
4020 | rdev->size = size; | |
4021 | ||
b2d444d7 | 4022 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4023 | printk(KERN_WARNING |
4024 | "md: can not hot-add faulty %s disk to %s!\n", | |
4025 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4026 | err = -EINVAL; | |
4027 | goto abort_export; | |
4028 | } | |
b2d444d7 | 4029 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4030 | rdev->desc_nr = -1; |
5842730d | 4031 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4032 | err = bind_rdev_to_array(rdev, mddev); |
4033 | if (err) | |
4034 | goto abort_export; | |
1da177e4 LT |
4035 | |
4036 | /* | |
4037 | * The rest should better be atomic, we can have disk failures | |
4038 | * noticed in interrupt contexts ... | |
4039 | */ | |
4040 | ||
4041 | if (rdev->desc_nr == mddev->max_disks) { | |
4042 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4043 | mdname(mddev)); | |
4044 | err = -EBUSY; | |
4045 | goto abort_unbind_export; | |
4046 | } | |
4047 | ||
4048 | rdev->raid_disk = -1; | |
4049 | ||
850b2b42 | 4050 | md_update_sb(mddev, 1); |
1da177e4 LT |
4051 | |
4052 | /* | |
4053 | * Kick recovery, maybe this spare has to be added to the | |
4054 | * array immediately. | |
4055 | */ | |
4056 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4057 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4058 | md_new_event(mddev); |
1da177e4 LT |
4059 | return 0; |
4060 | ||
4061 | abort_unbind_export: | |
4062 | unbind_rdev_from_array(rdev); | |
4063 | ||
4064 | abort_export: | |
4065 | export_rdev(rdev); | |
4066 | return err; | |
4067 | } | |
4068 | ||
32a7627c N |
4069 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4070 | { | |
4071 | int err; | |
4072 | ||
36fa3063 N |
4073 | if (mddev->pers) { |
4074 | if (!mddev->pers->quiesce) | |
4075 | return -EBUSY; | |
4076 | if (mddev->recovery || mddev->sync_thread) | |
4077 | return -EBUSY; | |
4078 | /* we should be able to change the bitmap.. */ | |
4079 | } | |
32a7627c | 4080 | |
32a7627c | 4081 | |
36fa3063 N |
4082 | if (fd >= 0) { |
4083 | if (mddev->bitmap) | |
4084 | return -EEXIST; /* cannot add when bitmap is present */ | |
4085 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4086 | |
36fa3063 N |
4087 | if (mddev->bitmap_file == NULL) { |
4088 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4089 | mdname(mddev)); | |
4090 | return -EBADF; | |
4091 | } | |
4092 | ||
4093 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4094 | if (err) { | |
4095 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4096 | mdname(mddev)); | |
4097 | fput(mddev->bitmap_file); | |
4098 | mddev->bitmap_file = NULL; | |
4099 | return err; | |
4100 | } | |
a654b9d8 | 4101 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4102 | } else if (mddev->bitmap == NULL) |
4103 | return -ENOENT; /* cannot remove what isn't there */ | |
4104 | err = 0; | |
4105 | if (mddev->pers) { | |
4106 | mddev->pers->quiesce(mddev, 1); | |
4107 | if (fd >= 0) | |
4108 | err = bitmap_create(mddev); | |
d7375ab3 | 4109 | if (fd < 0 || err) { |
36fa3063 | 4110 | bitmap_destroy(mddev); |
d7375ab3 N |
4111 | fd = -1; /* make sure to put the file */ |
4112 | } | |
36fa3063 | 4113 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4114 | } |
4115 | if (fd < 0) { | |
acc55e22 N |
4116 | if (mddev->bitmap_file) { |
4117 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4118 | fput(mddev->bitmap_file); |
acc55e22 | 4119 | } |
36fa3063 N |
4120 | mddev->bitmap_file = NULL; |
4121 | } | |
4122 | ||
32a7627c N |
4123 | return err; |
4124 | } | |
4125 | ||
1da177e4 LT |
4126 | /* |
4127 | * set_array_info is used two different ways | |
4128 | * The original usage is when creating a new array. | |
4129 | * In this usage, raid_disks is > 0 and it together with | |
4130 | * level, size, not_persistent,layout,chunksize determine the | |
4131 | * shape of the array. | |
4132 | * This will always create an array with a type-0.90.0 superblock. | |
4133 | * The newer usage is when assembling an array. | |
4134 | * In this case raid_disks will be 0, and the major_version field is | |
4135 | * use to determine which style super-blocks are to be found on the devices. | |
4136 | * The minor and patch _version numbers are also kept incase the | |
4137 | * super_block handler wishes to interpret them. | |
4138 | */ | |
4139 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4140 | { | |
4141 | ||
4142 | if (info->raid_disks == 0) { | |
4143 | /* just setting version number for superblock loading */ | |
4144 | if (info->major_version < 0 || | |
50511da3 | 4145 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4146 | super_types[info->major_version].name == NULL) { |
4147 | /* maybe try to auto-load a module? */ | |
4148 | printk(KERN_INFO | |
4149 | "md: superblock version %d not known\n", | |
4150 | info->major_version); | |
4151 | return -EINVAL; | |
4152 | } | |
4153 | mddev->major_version = info->major_version; | |
4154 | mddev->minor_version = info->minor_version; | |
4155 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4156 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4157 | return 0; |
4158 | } | |
4159 | mddev->major_version = MD_MAJOR_VERSION; | |
4160 | mddev->minor_version = MD_MINOR_VERSION; | |
4161 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4162 | mddev->ctime = get_seconds(); | |
4163 | ||
4164 | mddev->level = info->level; | |
17115e03 | 4165 | mddev->clevel[0] = 0; |
1da177e4 LT |
4166 | mddev->size = info->size; |
4167 | mddev->raid_disks = info->raid_disks; | |
4168 | /* don't set md_minor, it is determined by which /dev/md* was | |
4169 | * openned | |
4170 | */ | |
4171 | if (info->state & (1<<MD_SB_CLEAN)) | |
4172 | mddev->recovery_cp = MaxSector; | |
4173 | else | |
4174 | mddev->recovery_cp = 0; | |
4175 | mddev->persistent = ! info->not_persistent; | |
4176 | ||
4177 | mddev->layout = info->layout; | |
4178 | mddev->chunk_size = info->chunk_size; | |
4179 | ||
4180 | mddev->max_disks = MD_SB_DISKS; | |
4181 | ||
850b2b42 N |
4182 | mddev->flags = 0; |
4183 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1da177e4 | 4184 | |
b2a2703c N |
4185 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4186 | mddev->bitmap_offset = 0; | |
4187 | ||
f6705578 N |
4188 | mddev->reshape_position = MaxSector; |
4189 | ||
1da177e4 LT |
4190 | /* |
4191 | * Generate a 128 bit UUID | |
4192 | */ | |
4193 | get_random_bytes(mddev->uuid, 16); | |
4194 | ||
f6705578 N |
4195 | mddev->new_level = mddev->level; |
4196 | mddev->new_chunk = mddev->chunk_size; | |
4197 | mddev->new_layout = mddev->layout; | |
4198 | mddev->delta_disks = 0; | |
4199 | ||
1da177e4 LT |
4200 | return 0; |
4201 | } | |
4202 | ||
a35b0d69 N |
4203 | static int update_size(mddev_t *mddev, unsigned long size) |
4204 | { | |
4205 | mdk_rdev_t * rdev; | |
4206 | int rv; | |
4207 | struct list_head *tmp; | |
8ddeeae5 | 4208 | int fit = (size == 0); |
a35b0d69 N |
4209 | |
4210 | if (mddev->pers->resize == NULL) | |
4211 | return -EINVAL; | |
4212 | /* The "size" is the amount of each device that is used. | |
4213 | * This can only make sense for arrays with redundancy. | |
4214 | * linear and raid0 always use whatever space is available | |
4215 | * We can only consider changing the size if no resync | |
4216 | * or reconstruction is happening, and if the new size | |
4217 | * is acceptable. It must fit before the sb_offset or, | |
4218 | * if that is <data_offset, it must fit before the | |
4219 | * size of each device. | |
4220 | * If size is zero, we find the largest size that fits. | |
4221 | */ | |
4222 | if (mddev->sync_thread) | |
4223 | return -EBUSY; | |
4224 | ITERATE_RDEV(mddev,rdev,tmp) { | |
4225 | sector_t avail; | |
01ab5662 N |
4226 | avail = rdev->size * 2; |
4227 | ||
a35b0d69 N |
4228 | if (fit && (size == 0 || size > avail/2)) |
4229 | size = avail/2; | |
4230 | if (avail < ((sector_t)size << 1)) | |
4231 | return -ENOSPC; | |
4232 | } | |
4233 | rv = mddev->pers->resize(mddev, (sector_t)size *2); | |
4234 | if (!rv) { | |
4235 | struct block_device *bdev; | |
4236 | ||
4237 | bdev = bdget_disk(mddev->gendisk, 0); | |
4238 | if (bdev) { | |
1b1dcc1b | 4239 | mutex_lock(&bdev->bd_inode->i_mutex); |
6d89332b | 4240 | i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10); |
1b1dcc1b | 4241 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4242 | bdput(bdev); |
4243 | } | |
4244 | } | |
4245 | return rv; | |
4246 | } | |
4247 | ||
da943b99 N |
4248 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4249 | { | |
4250 | int rv; | |
4251 | /* change the number of raid disks */ | |
63c70c4f | 4252 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4253 | return -EINVAL; |
4254 | if (raid_disks <= 0 || | |
4255 | raid_disks >= mddev->max_disks) | |
4256 | return -EINVAL; | |
63c70c4f | 4257 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4258 | return -EBUSY; |
63c70c4f N |
4259 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4260 | ||
4261 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4262 | return rv; |
4263 | } | |
4264 | ||
4265 | ||
1da177e4 LT |
4266 | /* |
4267 | * update_array_info is used to change the configuration of an | |
4268 | * on-line array. | |
4269 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4270 | * fields in the info are checked against the array. | |
4271 | * Any differences that cannot be handled will cause an error. | |
4272 | * Normally, only one change can be managed at a time. | |
4273 | */ | |
4274 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4275 | { | |
4276 | int rv = 0; | |
4277 | int cnt = 0; | |
36fa3063 N |
4278 | int state = 0; |
4279 | ||
4280 | /* calculate expected state,ignoring low bits */ | |
4281 | if (mddev->bitmap && mddev->bitmap_offset) | |
4282 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4283 | |
4284 | if (mddev->major_version != info->major_version || | |
4285 | mddev->minor_version != info->minor_version || | |
4286 | /* mddev->patch_version != info->patch_version || */ | |
4287 | mddev->ctime != info->ctime || | |
4288 | mddev->level != info->level || | |
4289 | /* mddev->layout != info->layout || */ | |
4290 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4291 | mddev->chunk_size != info->chunk_size || |
4292 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4293 | ((state^info->state) & 0xfffffe00) | |
4294 | ) | |
1da177e4 LT |
4295 | return -EINVAL; |
4296 | /* Check there is only one change */ | |
284ae7ca | 4297 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4298 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4299 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4300 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4301 | if (cnt == 0) return 0; |
4302 | if (cnt > 1) return -EINVAL; | |
4303 | ||
4304 | if (mddev->layout != info->layout) { | |
4305 | /* Change layout | |
4306 | * we don't need to do anything at the md level, the | |
4307 | * personality will take care of it all. | |
4308 | */ | |
4309 | if (mddev->pers->reconfig == NULL) | |
4310 | return -EINVAL; | |
4311 | else | |
4312 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4313 | } | |
284ae7ca | 4314 | if (info->size >= 0 && mddev->size != info->size) |
a35b0d69 N |
4315 | rv = update_size(mddev, info->size); |
4316 | ||
da943b99 N |
4317 | if (mddev->raid_disks != info->raid_disks) |
4318 | rv = update_raid_disks(mddev, info->raid_disks); | |
4319 | ||
36fa3063 N |
4320 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4321 | if (mddev->pers->quiesce == NULL) | |
4322 | return -EINVAL; | |
4323 | if (mddev->recovery || mddev->sync_thread) | |
4324 | return -EBUSY; | |
4325 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4326 | /* add the bitmap */ | |
4327 | if (mddev->bitmap) | |
4328 | return -EEXIST; | |
4329 | if (mddev->default_bitmap_offset == 0) | |
4330 | return -EINVAL; | |
4331 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4332 | mddev->pers->quiesce(mddev, 1); | |
4333 | rv = bitmap_create(mddev); | |
4334 | if (rv) | |
4335 | bitmap_destroy(mddev); | |
4336 | mddev->pers->quiesce(mddev, 0); | |
4337 | } else { | |
4338 | /* remove the bitmap */ | |
4339 | if (!mddev->bitmap) | |
4340 | return -ENOENT; | |
4341 | if (mddev->bitmap->file) | |
4342 | return -EINVAL; | |
4343 | mddev->pers->quiesce(mddev, 1); | |
4344 | bitmap_destroy(mddev); | |
4345 | mddev->pers->quiesce(mddev, 0); | |
4346 | mddev->bitmap_offset = 0; | |
4347 | } | |
4348 | } | |
850b2b42 | 4349 | md_update_sb(mddev, 1); |
1da177e4 LT |
4350 | return rv; |
4351 | } | |
4352 | ||
4353 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4354 | { | |
4355 | mdk_rdev_t *rdev; | |
4356 | ||
4357 | if (mddev->pers == NULL) | |
4358 | return -ENODEV; | |
4359 | ||
4360 | rdev = find_rdev(mddev, dev); | |
4361 | if (!rdev) | |
4362 | return -ENODEV; | |
4363 | ||
4364 | md_error(mddev, rdev); | |
4365 | return 0; | |
4366 | } | |
4367 | ||
a885c8c4 CH |
4368 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4369 | { | |
4370 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4371 | ||
4372 | geo->heads = 2; | |
4373 | geo->sectors = 4; | |
4374 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4375 | return 0; | |
4376 | } | |
4377 | ||
1da177e4 LT |
4378 | static int md_ioctl(struct inode *inode, struct file *file, |
4379 | unsigned int cmd, unsigned long arg) | |
4380 | { | |
4381 | int err = 0; | |
4382 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4383 | mddev_t *mddev = NULL; |
4384 | ||
4385 | if (!capable(CAP_SYS_ADMIN)) | |
4386 | return -EACCES; | |
4387 | ||
4388 | /* | |
4389 | * Commands dealing with the RAID driver but not any | |
4390 | * particular array: | |
4391 | */ | |
4392 | switch (cmd) | |
4393 | { | |
4394 | case RAID_VERSION: | |
4395 | err = get_version(argp); | |
4396 | goto done; | |
4397 | ||
4398 | case PRINT_RAID_DEBUG: | |
4399 | err = 0; | |
4400 | md_print_devices(); | |
4401 | goto done; | |
4402 | ||
4403 | #ifndef MODULE | |
4404 | case RAID_AUTORUN: | |
4405 | err = 0; | |
4406 | autostart_arrays(arg); | |
4407 | goto done; | |
4408 | #endif | |
4409 | default:; | |
4410 | } | |
4411 | ||
4412 | /* | |
4413 | * Commands creating/starting a new array: | |
4414 | */ | |
4415 | ||
4416 | mddev = inode->i_bdev->bd_disk->private_data; | |
4417 | ||
4418 | if (!mddev) { | |
4419 | BUG(); | |
4420 | goto abort; | |
4421 | } | |
4422 | ||
1da177e4 LT |
4423 | err = mddev_lock(mddev); |
4424 | if (err) { | |
4425 | printk(KERN_INFO | |
4426 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4427 | err, cmd); | |
4428 | goto abort; | |
4429 | } | |
4430 | ||
4431 | switch (cmd) | |
4432 | { | |
4433 | case SET_ARRAY_INFO: | |
4434 | { | |
4435 | mdu_array_info_t info; | |
4436 | if (!arg) | |
4437 | memset(&info, 0, sizeof(info)); | |
4438 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4439 | err = -EFAULT; | |
4440 | goto abort_unlock; | |
4441 | } | |
4442 | if (mddev->pers) { | |
4443 | err = update_array_info(mddev, &info); | |
4444 | if (err) { | |
4445 | printk(KERN_WARNING "md: couldn't update" | |
4446 | " array info. %d\n", err); | |
4447 | goto abort_unlock; | |
4448 | } | |
4449 | goto done_unlock; | |
4450 | } | |
4451 | if (!list_empty(&mddev->disks)) { | |
4452 | printk(KERN_WARNING | |
4453 | "md: array %s already has disks!\n", | |
4454 | mdname(mddev)); | |
4455 | err = -EBUSY; | |
4456 | goto abort_unlock; | |
4457 | } | |
4458 | if (mddev->raid_disks) { | |
4459 | printk(KERN_WARNING | |
4460 | "md: array %s already initialised!\n", | |
4461 | mdname(mddev)); | |
4462 | err = -EBUSY; | |
4463 | goto abort_unlock; | |
4464 | } | |
4465 | err = set_array_info(mddev, &info); | |
4466 | if (err) { | |
4467 | printk(KERN_WARNING "md: couldn't set" | |
4468 | " array info. %d\n", err); | |
4469 | goto abort_unlock; | |
4470 | } | |
4471 | } | |
4472 | goto done_unlock; | |
4473 | ||
4474 | default:; | |
4475 | } | |
4476 | ||
4477 | /* | |
4478 | * Commands querying/configuring an existing array: | |
4479 | */ | |
32a7627c | 4480 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 4481 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
32a7627c | 4482 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY |
3f9d7b0d N |
4483 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE |
4484 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
4485 | err = -ENODEV; |
4486 | goto abort_unlock; | |
4487 | } | |
4488 | ||
4489 | /* | |
4490 | * Commands even a read-only array can execute: | |
4491 | */ | |
4492 | switch (cmd) | |
4493 | { | |
4494 | case GET_ARRAY_INFO: | |
4495 | err = get_array_info(mddev, argp); | |
4496 | goto done_unlock; | |
4497 | ||
32a7627c | 4498 | case GET_BITMAP_FILE: |
87162a28 | 4499 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
4500 | goto done_unlock; |
4501 | ||
1da177e4 LT |
4502 | case GET_DISK_INFO: |
4503 | err = get_disk_info(mddev, argp); | |
4504 | goto done_unlock; | |
4505 | ||
4506 | case RESTART_ARRAY_RW: | |
4507 | err = restart_array(mddev); | |
4508 | goto done_unlock; | |
4509 | ||
4510 | case STOP_ARRAY: | |
4511 | err = do_md_stop (mddev, 0); | |
4512 | goto done_unlock; | |
4513 | ||
4514 | case STOP_ARRAY_RO: | |
4515 | err = do_md_stop (mddev, 1); | |
4516 | goto done_unlock; | |
4517 | ||
4518 | /* | |
4519 | * We have a problem here : there is no easy way to give a CHS | |
4520 | * virtual geometry. We currently pretend that we have a 2 heads | |
4521 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4522 | * dosfs just mad... ;-) | |
4523 | */ | |
1da177e4 LT |
4524 | } |
4525 | ||
4526 | /* | |
4527 | * The remaining ioctls are changing the state of the | |
f91de92e N |
4528 | * superblock, so we do not allow them on read-only arrays. |
4529 | * However non-MD ioctls (e.g. get-size) will still come through | |
4530 | * here and hit the 'default' below, so only disallow | |
4531 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 4532 | */ |
f91de92e N |
4533 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
4534 | mddev->ro && mddev->pers) { | |
4535 | if (mddev->ro == 2) { | |
4536 | mddev->ro = 0; | |
4537 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4538 | md_wakeup_thread(mddev->thread); | |
4539 | ||
4540 | } else { | |
4541 | err = -EROFS; | |
4542 | goto abort_unlock; | |
4543 | } | |
1da177e4 LT |
4544 | } |
4545 | ||
4546 | switch (cmd) | |
4547 | { | |
4548 | case ADD_NEW_DISK: | |
4549 | { | |
4550 | mdu_disk_info_t info; | |
4551 | if (copy_from_user(&info, argp, sizeof(info))) | |
4552 | err = -EFAULT; | |
4553 | else | |
4554 | err = add_new_disk(mddev, &info); | |
4555 | goto done_unlock; | |
4556 | } | |
4557 | ||
4558 | case HOT_REMOVE_DISK: | |
4559 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
4560 | goto done_unlock; | |
4561 | ||
4562 | case HOT_ADD_DISK: | |
4563 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
4564 | goto done_unlock; | |
4565 | ||
4566 | case SET_DISK_FAULTY: | |
4567 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
4568 | goto done_unlock; | |
4569 | ||
4570 | case RUN_ARRAY: | |
4571 | err = do_md_run (mddev); | |
4572 | goto done_unlock; | |
4573 | ||
32a7627c N |
4574 | case SET_BITMAP_FILE: |
4575 | err = set_bitmap_file(mddev, (int)arg); | |
4576 | goto done_unlock; | |
4577 | ||
1da177e4 | 4578 | default: |
1da177e4 LT |
4579 | err = -EINVAL; |
4580 | goto abort_unlock; | |
4581 | } | |
4582 | ||
4583 | done_unlock: | |
4584 | abort_unlock: | |
4585 | mddev_unlock(mddev); | |
4586 | ||
4587 | return err; | |
4588 | done: | |
4589 | if (err) | |
4590 | MD_BUG(); | |
4591 | abort: | |
4592 | return err; | |
4593 | } | |
4594 | ||
4595 | static int md_open(struct inode *inode, struct file *file) | |
4596 | { | |
4597 | /* | |
4598 | * Succeed if we can lock the mddev, which confirms that | |
4599 | * it isn't being stopped right now. | |
4600 | */ | |
4601 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4602 | int err; | |
4603 | ||
d63a5a74 | 4604 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
4605 | goto out; |
4606 | ||
4607 | err = 0; | |
4608 | mddev_get(mddev); | |
4609 | mddev_unlock(mddev); | |
4610 | ||
4611 | check_disk_change(inode->i_bdev); | |
4612 | out: | |
4613 | return err; | |
4614 | } | |
4615 | ||
4616 | static int md_release(struct inode *inode, struct file * file) | |
4617 | { | |
4618 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4619 | ||
52e5f9d1 | 4620 | BUG_ON(!mddev); |
1da177e4 LT |
4621 | mddev_put(mddev); |
4622 | ||
4623 | return 0; | |
4624 | } | |
4625 | ||
44ce6294 LT |
4626 | static int md_media_changed(struct gendisk *disk) |
4627 | { | |
4628 | mddev_t *mddev = disk->private_data; | |
4629 | ||
4630 | return mddev->changed; | |
4631 | } | |
4632 | ||
4633 | static int md_revalidate(struct gendisk *disk) | |
4634 | { | |
4635 | mddev_t *mddev = disk->private_data; | |
4636 | ||
4637 | mddev->changed = 0; | |
4638 | return 0; | |
4639 | } | |
1da177e4 LT |
4640 | static struct block_device_operations md_fops = |
4641 | { | |
4642 | .owner = THIS_MODULE, | |
4643 | .open = md_open, | |
4644 | .release = md_release, | |
4645 | .ioctl = md_ioctl, | |
a885c8c4 | 4646 | .getgeo = md_getgeo, |
44ce6294 LT |
4647 | .media_changed = md_media_changed, |
4648 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
4649 | }; |
4650 | ||
75c96f85 | 4651 | static int md_thread(void * arg) |
1da177e4 LT |
4652 | { |
4653 | mdk_thread_t *thread = arg; | |
4654 | ||
1da177e4 LT |
4655 | /* |
4656 | * md_thread is a 'system-thread', it's priority should be very | |
4657 | * high. We avoid resource deadlocks individually in each | |
4658 | * raid personality. (RAID5 does preallocation) We also use RR and | |
4659 | * the very same RT priority as kswapd, thus we will never get | |
4660 | * into a priority inversion deadlock. | |
4661 | * | |
4662 | * we definitely have to have equal or higher priority than | |
4663 | * bdflush, otherwise bdflush will deadlock if there are too | |
4664 | * many dirty RAID5 blocks. | |
4665 | */ | |
1da177e4 | 4666 | |
6985c43f | 4667 | allow_signal(SIGKILL); |
a6fb0934 | 4668 | while (!kthread_should_stop()) { |
1da177e4 | 4669 | |
93588e22 N |
4670 | /* We need to wait INTERRUPTIBLE so that |
4671 | * we don't add to the load-average. | |
4672 | * That means we need to be sure no signals are | |
4673 | * pending | |
4674 | */ | |
4675 | if (signal_pending(current)) | |
4676 | flush_signals(current); | |
4677 | ||
4678 | wait_event_interruptible_timeout | |
4679 | (thread->wqueue, | |
4680 | test_bit(THREAD_WAKEUP, &thread->flags) | |
4681 | || kthread_should_stop(), | |
4682 | thread->timeout); | |
1da177e4 LT |
4683 | |
4684 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
4685 | ||
787453c2 | 4686 | thread->run(thread->mddev); |
1da177e4 | 4687 | } |
a6fb0934 | 4688 | |
1da177e4 LT |
4689 | return 0; |
4690 | } | |
4691 | ||
4692 | void md_wakeup_thread(mdk_thread_t *thread) | |
4693 | { | |
4694 | if (thread) { | |
4695 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
4696 | set_bit(THREAD_WAKEUP, &thread->flags); | |
4697 | wake_up(&thread->wqueue); | |
4698 | } | |
4699 | } | |
4700 | ||
4701 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
4702 | const char *name) | |
4703 | { | |
4704 | mdk_thread_t *thread; | |
1da177e4 | 4705 | |
9ffae0cf | 4706 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
4707 | if (!thread) |
4708 | return NULL; | |
4709 | ||
1da177e4 LT |
4710 | init_waitqueue_head(&thread->wqueue); |
4711 | ||
1da177e4 LT |
4712 | thread->run = run; |
4713 | thread->mddev = mddev; | |
32a7627c | 4714 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 4715 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 4716 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
4717 | kfree(thread); |
4718 | return NULL; | |
4719 | } | |
1da177e4 LT |
4720 | return thread; |
4721 | } | |
4722 | ||
1da177e4 LT |
4723 | void md_unregister_thread(mdk_thread_t *thread) |
4724 | { | |
d28446fe | 4725 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
4726 | |
4727 | kthread_stop(thread->tsk); | |
1da177e4 LT |
4728 | kfree(thread); |
4729 | } | |
4730 | ||
4731 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
4732 | { | |
4733 | if (!mddev) { | |
4734 | MD_BUG(); | |
4735 | return; | |
4736 | } | |
4737 | ||
b2d444d7 | 4738 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4739 | return; |
32a7627c | 4740 | /* |
1da177e4 LT |
4741 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
4742 | mdname(mddev), | |
4743 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
4744 | __builtin_return_address(0),__builtin_return_address(1), | |
4745 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 4746 | */ |
d0a0a5ee AM |
4747 | if (!mddev->pers) |
4748 | return; | |
1da177e4 LT |
4749 | if (!mddev->pers->error_handler) |
4750 | return; | |
4751 | mddev->pers->error_handler(mddev,rdev); | |
4752 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4753 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4754 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 4755 | md_new_event_inintr(mddev); |
1da177e4 LT |
4756 | } |
4757 | ||
4758 | /* seq_file implementation /proc/mdstat */ | |
4759 | ||
4760 | static void status_unused(struct seq_file *seq) | |
4761 | { | |
4762 | int i = 0; | |
4763 | mdk_rdev_t *rdev; | |
4764 | struct list_head *tmp; | |
4765 | ||
4766 | seq_printf(seq, "unused devices: "); | |
4767 | ||
4768 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
4769 | char b[BDEVNAME_SIZE]; | |
4770 | i++; | |
4771 | seq_printf(seq, "%s ", | |
4772 | bdevname(rdev->bdev,b)); | |
4773 | } | |
4774 | if (!i) | |
4775 | seq_printf(seq, "<none>"); | |
4776 | ||
4777 | seq_printf(seq, "\n"); | |
4778 | } | |
4779 | ||
4780 | ||
4781 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
4782 | { | |
4588b42e N |
4783 | sector_t max_blocks, resync, res; |
4784 | unsigned long dt, db, rt; | |
4785 | int scale; | |
4786 | unsigned int per_milli; | |
1da177e4 LT |
4787 | |
4788 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
4789 | ||
4790 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4791 | max_blocks = mddev->resync_max_sectors >> 1; | |
4792 | else | |
4793 | max_blocks = mddev->size; | |
4794 | ||
4795 | /* | |
4796 | * Should not happen. | |
4797 | */ | |
4798 | if (!max_blocks) { | |
4799 | MD_BUG(); | |
4800 | return; | |
4801 | } | |
4588b42e N |
4802 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
4803 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
4804 | * u32, as those are the requirements for sector_div. | |
4805 | * Thus 'scale' must be at least 10 | |
4806 | */ | |
4807 | scale = 10; | |
4808 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
4809 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
4810 | scale++; | |
4811 | } | |
4812 | res = (resync>>scale)*1000; | |
4813 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
4814 | ||
4815 | per_milli = res; | |
1da177e4 | 4816 | { |
4588b42e | 4817 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
4818 | seq_printf(seq, "["); |
4819 | for (i = 0; i < x; i++) | |
4820 | seq_printf(seq, "="); | |
4821 | seq_printf(seq, ">"); | |
4822 | for (i = 0; i < y; i++) | |
4823 | seq_printf(seq, "."); | |
4824 | seq_printf(seq, "] "); | |
4825 | } | |
4588b42e | 4826 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
4827 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
4828 | "reshape" : | |
61df9d91 N |
4829 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
4830 | "check" : | |
4831 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
4832 | "resync" : "recovery"))), | |
4833 | per_milli/10, per_milli % 10, | |
4588b42e N |
4834 | (unsigned long long) resync, |
4835 | (unsigned long long) max_blocks); | |
1da177e4 LT |
4836 | |
4837 | /* | |
4838 | * We do not want to overflow, so the order of operands and | |
4839 | * the * 100 / 100 trick are important. We do a +1 to be | |
4840 | * safe against division by zero. We only estimate anyway. | |
4841 | * | |
4842 | * dt: time from mark until now | |
4843 | * db: blocks written from mark until now | |
4844 | * rt: remaining time | |
4845 | */ | |
4846 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
4847 | if (!dt) dt++; | |
ff4e8d9a N |
4848 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
4849 | - mddev->resync_mark_cnt; | |
4850 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
4851 | |
4852 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
4853 | ||
ff4e8d9a | 4854 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
4855 | } |
4856 | ||
4857 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
4858 | { | |
4859 | struct list_head *tmp; | |
4860 | loff_t l = *pos; | |
4861 | mddev_t *mddev; | |
4862 | ||
4863 | if (l >= 0x10000) | |
4864 | return NULL; | |
4865 | if (!l--) | |
4866 | /* header */ | |
4867 | return (void*)1; | |
4868 | ||
4869 | spin_lock(&all_mddevs_lock); | |
4870 | list_for_each(tmp,&all_mddevs) | |
4871 | if (!l--) { | |
4872 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
4873 | mddev_get(mddev); | |
4874 | spin_unlock(&all_mddevs_lock); | |
4875 | return mddev; | |
4876 | } | |
4877 | spin_unlock(&all_mddevs_lock); | |
4878 | if (!l--) | |
4879 | return (void*)2;/* tail */ | |
4880 | return NULL; | |
4881 | } | |
4882 | ||
4883 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4884 | { | |
4885 | struct list_head *tmp; | |
4886 | mddev_t *next_mddev, *mddev = v; | |
4887 | ||
4888 | ++*pos; | |
4889 | if (v == (void*)2) | |
4890 | return NULL; | |
4891 | ||
4892 | spin_lock(&all_mddevs_lock); | |
4893 | if (v == (void*)1) | |
4894 | tmp = all_mddevs.next; | |
4895 | else | |
4896 | tmp = mddev->all_mddevs.next; | |
4897 | if (tmp != &all_mddevs) | |
4898 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
4899 | else { | |
4900 | next_mddev = (void*)2; | |
4901 | *pos = 0x10000; | |
4902 | } | |
4903 | spin_unlock(&all_mddevs_lock); | |
4904 | ||
4905 | if (v != (void*)1) | |
4906 | mddev_put(mddev); | |
4907 | return next_mddev; | |
4908 | ||
4909 | } | |
4910 | ||
4911 | static void md_seq_stop(struct seq_file *seq, void *v) | |
4912 | { | |
4913 | mddev_t *mddev = v; | |
4914 | ||
4915 | if (mddev && v != (void*)1 && v != (void*)2) | |
4916 | mddev_put(mddev); | |
4917 | } | |
4918 | ||
d7603b7e N |
4919 | struct mdstat_info { |
4920 | int event; | |
4921 | }; | |
4922 | ||
1da177e4 LT |
4923 | static int md_seq_show(struct seq_file *seq, void *v) |
4924 | { | |
4925 | mddev_t *mddev = v; | |
4926 | sector_t size; | |
4927 | struct list_head *tmp2; | |
4928 | mdk_rdev_t *rdev; | |
d7603b7e | 4929 | struct mdstat_info *mi = seq->private; |
32a7627c | 4930 | struct bitmap *bitmap; |
1da177e4 LT |
4931 | |
4932 | if (v == (void*)1) { | |
2604b703 | 4933 | struct mdk_personality *pers; |
1da177e4 LT |
4934 | seq_printf(seq, "Personalities : "); |
4935 | spin_lock(&pers_lock); | |
2604b703 N |
4936 | list_for_each_entry(pers, &pers_list, list) |
4937 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
4938 | |
4939 | spin_unlock(&pers_lock); | |
4940 | seq_printf(seq, "\n"); | |
d7603b7e | 4941 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
4942 | return 0; |
4943 | } | |
4944 | if (v == (void*)2) { | |
4945 | status_unused(seq); | |
4946 | return 0; | |
4947 | } | |
4948 | ||
5dc5cf7d | 4949 | if (mddev_lock(mddev) < 0) |
1da177e4 | 4950 | return -EINTR; |
5dc5cf7d | 4951 | |
1da177e4 LT |
4952 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
4953 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
4954 | mddev->pers ? "" : "in"); | |
4955 | if (mddev->pers) { | |
f91de92e | 4956 | if (mddev->ro==1) |
1da177e4 | 4957 | seq_printf(seq, " (read-only)"); |
f91de92e N |
4958 | if (mddev->ro==2) |
4959 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
4960 | seq_printf(seq, " %s", mddev->pers->name); |
4961 | } | |
4962 | ||
4963 | size = 0; | |
4964 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
4965 | char b[BDEVNAME_SIZE]; | |
4966 | seq_printf(seq, " %s[%d]", | |
4967 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
4968 | if (test_bit(WriteMostly, &rdev->flags)) |
4969 | seq_printf(seq, "(W)"); | |
b2d444d7 | 4970 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4971 | seq_printf(seq, "(F)"); |
4972 | continue; | |
b325a32e N |
4973 | } else if (rdev->raid_disk < 0) |
4974 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
4975 | size += rdev->size; |
4976 | } | |
4977 | ||
4978 | if (!list_empty(&mddev->disks)) { | |
4979 | if (mddev->pers) | |
4980 | seq_printf(seq, "\n %llu blocks", | |
4981 | (unsigned long long)mddev->array_size); | |
4982 | else | |
4983 | seq_printf(seq, "\n %llu blocks", | |
4984 | (unsigned long long)size); | |
4985 | } | |
1cd6bf19 N |
4986 | if (mddev->persistent) { |
4987 | if (mddev->major_version != 0 || | |
4988 | mddev->minor_version != 90) { | |
4989 | seq_printf(seq," super %d.%d", | |
4990 | mddev->major_version, | |
4991 | mddev->minor_version); | |
4992 | } | |
4993 | } else | |
4994 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
4995 | |
4996 | if (mddev->pers) { | |
4997 | mddev->pers->status (seq, mddev); | |
4998 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
4999 | if (mddev->pers->sync_request) { |
5000 | if (mddev->curr_resync > 2) { | |
5001 | status_resync (seq, mddev); | |
5002 | seq_printf(seq, "\n "); | |
5003 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5004 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5005 | else if (mddev->recovery_cp < MaxSector) | |
5006 | seq_printf(seq, "\tresync=PENDING\n "); | |
5007 | } | |
32a7627c N |
5008 | } else |
5009 | seq_printf(seq, "\n "); | |
5010 | ||
5011 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5012 | unsigned long chunk_kb; |
5013 | unsigned long flags; | |
32a7627c N |
5014 | spin_lock_irqsave(&bitmap->lock, flags); |
5015 | chunk_kb = bitmap->chunksize >> 10; | |
5016 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5017 | "%lu%s chunk", | |
5018 | bitmap->pages - bitmap->missing_pages, | |
5019 | bitmap->pages, | |
5020 | (bitmap->pages - bitmap->missing_pages) | |
5021 | << (PAGE_SHIFT - 10), | |
5022 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5023 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5024 | if (bitmap->file) { |
5025 | seq_printf(seq, ", file: "); | |
c649bb9c JS |
5026 | seq_path(seq, bitmap->file->f_path.mnt, |
5027 | bitmap->file->f_path.dentry," \t\n"); | |
32a7627c | 5028 | } |
78d742d8 | 5029 | |
32a7627c N |
5030 | seq_printf(seq, "\n"); |
5031 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5032 | } |
5033 | ||
5034 | seq_printf(seq, "\n"); | |
5035 | } | |
5036 | mddev_unlock(mddev); | |
5037 | ||
5038 | return 0; | |
5039 | } | |
5040 | ||
5041 | static struct seq_operations md_seq_ops = { | |
5042 | .start = md_seq_start, | |
5043 | .next = md_seq_next, | |
5044 | .stop = md_seq_stop, | |
5045 | .show = md_seq_show, | |
5046 | }; | |
5047 | ||
5048 | static int md_seq_open(struct inode *inode, struct file *file) | |
5049 | { | |
5050 | int error; | |
d7603b7e N |
5051 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5052 | if (mi == NULL) | |
5053 | return -ENOMEM; | |
1da177e4 LT |
5054 | |
5055 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5056 | if (error) |
5057 | kfree(mi); | |
5058 | else { | |
5059 | struct seq_file *p = file->private_data; | |
5060 | p->private = mi; | |
5061 | mi->event = atomic_read(&md_event_count); | |
5062 | } | |
1da177e4 LT |
5063 | return error; |
5064 | } | |
5065 | ||
d7603b7e N |
5066 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5067 | { | |
5068 | struct seq_file *m = filp->private_data; | |
5069 | struct mdstat_info *mi = m->private; | |
5070 | int mask; | |
5071 | ||
5072 | poll_wait(filp, &md_event_waiters, wait); | |
5073 | ||
5074 | /* always allow read */ | |
5075 | mask = POLLIN | POLLRDNORM; | |
5076 | ||
5077 | if (mi->event != atomic_read(&md_event_count)) | |
5078 | mask |= POLLERR | POLLPRI; | |
5079 | return mask; | |
5080 | } | |
5081 | ||
fa027c2a | 5082 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5083 | .owner = THIS_MODULE, |
1da177e4 LT |
5084 | .open = md_seq_open, |
5085 | .read = seq_read, | |
5086 | .llseek = seq_lseek, | |
c3f94b40 | 5087 | .release = seq_release_private, |
d7603b7e | 5088 | .poll = mdstat_poll, |
1da177e4 LT |
5089 | }; |
5090 | ||
2604b703 | 5091 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5092 | { |
1da177e4 | 5093 | spin_lock(&pers_lock); |
2604b703 N |
5094 | list_add_tail(&p->list, &pers_list); |
5095 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5096 | spin_unlock(&pers_lock); |
5097 | return 0; | |
5098 | } | |
5099 | ||
2604b703 | 5100 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5101 | { |
2604b703 | 5102 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5103 | spin_lock(&pers_lock); |
2604b703 | 5104 | list_del_init(&p->list); |
1da177e4 LT |
5105 | spin_unlock(&pers_lock); |
5106 | return 0; | |
5107 | } | |
5108 | ||
5109 | static int is_mddev_idle(mddev_t *mddev) | |
5110 | { | |
5111 | mdk_rdev_t * rdev; | |
5112 | struct list_head *tmp; | |
5113 | int idle; | |
713f6ab1 | 5114 | long curr_events; |
1da177e4 LT |
5115 | |
5116 | idle = 1; | |
5117 | ITERATE_RDEV(mddev,rdev,tmp) { | |
5118 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
5119 | curr_events = disk_stat_read(disk, sectors[0]) + |
5120 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 5121 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5122 | /* sync IO will cause sync_io to increase before the disk_stats |
5123 | * as sync_io is counted when a request starts, and | |
5124 | * disk_stats is counted when it completes. | |
5125 | * So resync activity will cause curr_events to be smaller than | |
5126 | * when there was no such activity. | |
5127 | * non-sync IO will cause disk_stat to increase without | |
5128 | * increasing sync_io so curr_events will (eventually) | |
5129 | * be larger than it was before. Once it becomes | |
5130 | * substantially larger, the test below will cause | |
5131 | * the array to appear non-idle, and resync will slow | |
5132 | * down. | |
5133 | * If there is a lot of outstanding resync activity when | |
5134 | * we set last_event to curr_events, then all that activity | |
5135 | * completing might cause the array to appear non-idle | |
5136 | * and resync will be slowed down even though there might | |
5137 | * not have been non-resync activity. This will only | |
5138 | * happen once though. 'last_events' will soon reflect | |
5139 | * the state where there is little or no outstanding | |
5140 | * resync requests, and further resync activity will | |
5141 | * always make curr_events less than last_events. | |
c0e48521 | 5142 | * |
1da177e4 | 5143 | */ |
713f6ab1 | 5144 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5145 | rdev->last_events = curr_events; |
5146 | idle = 0; | |
5147 | } | |
5148 | } | |
5149 | return idle; | |
5150 | } | |
5151 | ||
5152 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5153 | { | |
5154 | /* another "blocks" (512byte) blocks have been synced */ | |
5155 | atomic_sub(blocks, &mddev->recovery_active); | |
5156 | wake_up(&mddev->recovery_wait); | |
5157 | if (!ok) { | |
5158 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5159 | md_wakeup_thread(mddev->thread); | |
5160 | // stop recovery, signal do_sync .... | |
5161 | } | |
5162 | } | |
5163 | ||
5164 | ||
06d91a5f N |
5165 | /* md_write_start(mddev, bi) |
5166 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5167 | * in superblock) before writing, schedule a superblock update |
5168 | * and wait for it to complete. | |
06d91a5f | 5169 | */ |
3d310eb7 | 5170 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5171 | { |
06d91a5f | 5172 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5173 | return; |
06d91a5f | 5174 | |
f91de92e N |
5175 | BUG_ON(mddev->ro == 1); |
5176 | if (mddev->ro == 2) { | |
5177 | /* need to switch to read/write */ | |
5178 | mddev->ro = 0; | |
5179 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5180 | md_wakeup_thread(mddev->thread); | |
5181 | } | |
06d91a5f | 5182 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 5183 | if (mddev->in_sync) { |
a9701a30 | 5184 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5185 | if (mddev->in_sync) { |
5186 | mddev->in_sync = 0; | |
850b2b42 | 5187 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 N |
5188 | md_wakeup_thread(mddev->thread); |
5189 | } | |
a9701a30 | 5190 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5191 | } |
850b2b42 | 5192 | wait_event(mddev->sb_wait, mddev->flags==0); |
1da177e4 LT |
5193 | } |
5194 | ||
5195 | void md_write_end(mddev_t *mddev) | |
5196 | { | |
5197 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5198 | if (mddev->safemode == 2) | |
5199 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5200 | else if (mddev->safemode_delay) |
1da177e4 LT |
5201 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5202 | } | |
5203 | } | |
5204 | ||
2a2275d6 N |
5205 | /* md_allow_write(mddev) |
5206 | * Calling this ensures that the array is marked 'active' so that writes | |
5207 | * may proceed without blocking. It is important to call this before | |
5208 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5209 | * Must be called with mddev_lock held. | |
5210 | */ | |
5211 | void md_allow_write(mddev_t *mddev) | |
5212 | { | |
5213 | if (!mddev->pers) | |
5214 | return; | |
5215 | if (mddev->ro) | |
5216 | return; | |
5217 | ||
5218 | spin_lock_irq(&mddev->write_lock); | |
5219 | if (mddev->in_sync) { | |
5220 | mddev->in_sync = 0; | |
5221 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5222 | if (mddev->safemode_delay && | |
5223 | mddev->safemode == 0) | |
5224 | mddev->safemode = 1; | |
5225 | spin_unlock_irq(&mddev->write_lock); | |
5226 | md_update_sb(mddev, 0); | |
5227 | } else | |
5228 | spin_unlock_irq(&mddev->write_lock); | |
5229 | } | |
5230 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5231 | ||
75c96f85 | 5232 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
5233 | |
5234 | #define SYNC_MARKS 10 | |
5235 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5236 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5237 | { |
5238 | mddev_t *mddev2; | |
5239 | unsigned int currspeed = 0, | |
5240 | window; | |
57afd89f | 5241 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5242 | unsigned long mark[SYNC_MARKS]; |
5243 | sector_t mark_cnt[SYNC_MARKS]; | |
5244 | int last_mark,m; | |
5245 | struct list_head *tmp; | |
5246 | sector_t last_check; | |
57afd89f | 5247 | int skipped = 0; |
5fd6c1dc N |
5248 | struct list_head *rtmp; |
5249 | mdk_rdev_t *rdev; | |
61df9d91 | 5250 | char *desc; |
1da177e4 LT |
5251 | |
5252 | /* just incase thread restarts... */ | |
5253 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5254 | return; | |
5fd6c1dc N |
5255 | if (mddev->ro) /* never try to sync a read-only array */ |
5256 | return; | |
1da177e4 | 5257 | |
61df9d91 N |
5258 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5259 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5260 | desc = "data-check"; | |
5261 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5262 | desc = "requested-resync"; | |
5263 | else | |
5264 | desc = "resync"; | |
5265 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5266 | desc = "reshape"; | |
5267 | else | |
5268 | desc = "recovery"; | |
5269 | ||
1da177e4 LT |
5270 | /* we overload curr_resync somewhat here. |
5271 | * 0 == not engaged in resync at all | |
5272 | * 2 == checking that there is no conflict with another sync | |
5273 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5274 | * commense | |
5275 | * other == active in resync - this many blocks | |
5276 | * | |
5277 | * Before starting a resync we must have set curr_resync to | |
5278 | * 2, and then checked that every "conflicting" array has curr_resync | |
5279 | * less than ours. When we find one that is the same or higher | |
5280 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5281 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5282 | * This will mean we have to start checking from the beginning again. | |
5283 | * | |
5284 | */ | |
5285 | ||
5286 | do { | |
5287 | mddev->curr_resync = 2; | |
5288 | ||
5289 | try_again: | |
787453c2 | 5290 | if (kthread_should_stop()) { |
6985c43f | 5291 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5292 | goto skip; |
5293 | } | |
5294 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
5295 | if (mddev2 == mddev) |
5296 | continue; | |
5297 | if (mddev2->curr_resync && | |
5298 | match_mddev_units(mddev,mddev2)) { | |
5299 | DEFINE_WAIT(wq); | |
5300 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5301 | /* arbitrarily yield */ | |
5302 | mddev->curr_resync = 1; | |
5303 | wake_up(&resync_wait); | |
5304 | } | |
5305 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5306 | /* no need to wait here, we can wait the next | |
5307 | * time 'round when curr_resync == 2 | |
5308 | */ | |
5309 | continue; | |
787453c2 N |
5310 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
5311 | if (!kthread_should_stop() && | |
8712e553 | 5312 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5313 | printk(KERN_INFO "md: delaying %s of %s" |
5314 | " until %s has finished (they" | |
1da177e4 | 5315 | " share one or more physical units)\n", |
61df9d91 | 5316 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 LT |
5317 | mddev_put(mddev2); |
5318 | schedule(); | |
5319 | finish_wait(&resync_wait, &wq); | |
5320 | goto try_again; | |
5321 | } | |
5322 | finish_wait(&resync_wait, &wq); | |
5323 | } | |
5324 | } | |
5325 | } while (mddev->curr_resync < 2); | |
5326 | ||
5fd6c1dc | 5327 | j = 0; |
9d88883e | 5328 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5329 | /* resync follows the size requested by the personality, |
57afd89f | 5330 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5331 | */ |
5332 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5333 | mddev->resync_mismatches = 0; |
5fd6c1dc N |
5334 | /* we don't use the checkpoint if there's a bitmap */ |
5335 | if (!mddev->bitmap && | |
5336 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5337 | j = mddev->recovery_cp; | |
ccfcc3c1 N |
5338 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5339 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5340 | else { |
1da177e4 LT |
5341 | /* recovery follows the physical size of devices */ |
5342 | max_sectors = mddev->size << 1; | |
5fd6c1dc N |
5343 | j = MaxSector; |
5344 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5345 | if (rdev->raid_disk >= 0 && | |
5346 | !test_bit(Faulty, &rdev->flags) && | |
5347 | !test_bit(In_sync, &rdev->flags) && | |
5348 | rdev->recovery_offset < j) | |
5349 | j = rdev->recovery_offset; | |
5350 | } | |
1da177e4 | 5351 | |
61df9d91 N |
5352 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5353 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5354 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5355 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5356 | "(but not more than %d KB/sec) for %s.\n", |
5357 | speed_max(mddev), desc); | |
1da177e4 LT |
5358 | |
5359 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5360 | |
57afd89f | 5361 | io_sectors = 0; |
1da177e4 LT |
5362 | for (m = 0; m < SYNC_MARKS; m++) { |
5363 | mark[m] = jiffies; | |
57afd89f | 5364 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5365 | } |
5366 | last_mark = 0; | |
5367 | mddev->resync_mark = mark[last_mark]; | |
5368 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
5369 | ||
5370 | /* | |
5371 | * Tune reconstruction: | |
5372 | */ | |
5373 | window = 32*(PAGE_SIZE/512); | |
5374 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
5375 | window/2,(unsigned long long) max_sectors/2); | |
5376 | ||
5377 | atomic_set(&mddev->recovery_active, 0); | |
5378 | init_waitqueue_head(&mddev->recovery_wait); | |
5379 | last_check = 0; | |
5380 | ||
5381 | if (j>2) { | |
5382 | printk(KERN_INFO | |
61df9d91 N |
5383 | "md: resuming %s of %s from checkpoint.\n", |
5384 | desc, mdname(mddev)); | |
1da177e4 LT |
5385 | mddev->curr_resync = j; |
5386 | } | |
5387 | ||
5388 | while (j < max_sectors) { | |
57afd89f | 5389 | sector_t sectors; |
1da177e4 | 5390 | |
57afd89f N |
5391 | skipped = 0; |
5392 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
88202a0c | 5393 | currspeed < speed_min(mddev)); |
57afd89f | 5394 | if (sectors == 0) { |
1da177e4 LT |
5395 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
5396 | goto out; | |
5397 | } | |
57afd89f N |
5398 | |
5399 | if (!skipped) { /* actual IO requested */ | |
5400 | io_sectors += sectors; | |
5401 | atomic_add(sectors, &mddev->recovery_active); | |
5402 | } | |
5403 | ||
1da177e4 LT |
5404 | j += sectors; |
5405 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 5406 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
5407 | if (last_check == 0) |
5408 | /* this is the earliers that rebuilt will be | |
5409 | * visible in /proc/mdstat | |
5410 | */ | |
5411 | md_new_event(mddev); | |
57afd89f N |
5412 | |
5413 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
5414 | continue; |
5415 | ||
57afd89f | 5416 | last_check = io_sectors; |
1da177e4 LT |
5417 | |
5418 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
5419 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
5420 | break; | |
5421 | ||
5422 | repeat: | |
5423 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
5424 | /* step marks */ | |
5425 | int next = (last_mark+1) % SYNC_MARKS; | |
5426 | ||
5427 | mddev->resync_mark = mark[next]; | |
5428 | mddev->resync_mark_cnt = mark_cnt[next]; | |
5429 | mark[next] = jiffies; | |
57afd89f | 5430 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5431 | last_mark = next; |
5432 | } | |
5433 | ||
5434 | ||
787453c2 | 5435 | if (kthread_should_stop()) { |
1da177e4 LT |
5436 | /* |
5437 | * got a signal, exit. | |
5438 | */ | |
5439 | printk(KERN_INFO | |
5440 | "md: md_do_sync() got signal ... exiting\n"); | |
1da177e4 LT |
5441 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5442 | goto out; | |
5443 | } | |
5444 | ||
5445 | /* | |
5446 | * this loop exits only if either when we are slower than | |
5447 | * the 'hard' speed limit, or the system was IO-idle for | |
5448 | * a jiffy. | |
5449 | * the system might be non-idle CPU-wise, but we only care | |
5450 | * about not overloading the IO subsystem. (things like an | |
5451 | * e2fsck being done on the RAID array should execute fast) | |
5452 | */ | |
5453 | mddev->queue->unplug_fn(mddev->queue); | |
5454 | cond_resched(); | |
5455 | ||
57afd89f N |
5456 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
5457 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 5458 | |
88202a0c N |
5459 | if (currspeed > speed_min(mddev)) { |
5460 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 5461 | !is_mddev_idle(mddev)) { |
c0e48521 | 5462 | msleep(500); |
1da177e4 LT |
5463 | goto repeat; |
5464 | } | |
5465 | } | |
5466 | } | |
61df9d91 | 5467 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
5468 | /* |
5469 | * this also signals 'finished resyncing' to md_stop | |
5470 | */ | |
5471 | out: | |
5472 | mddev->queue->unplug_fn(mddev->queue); | |
5473 | ||
5474 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
5475 | ||
5476 | /* tell personality that we are finished */ | |
57afd89f | 5477 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
5478 | |
5479 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
ccfcc3c1 | 5480 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
5481 | mddev->curr_resync > 2) { |
5482 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
5483 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5484 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
5485 | printk(KERN_INFO | |
61df9d91 N |
5486 | "md: checkpointing %s of %s.\n", |
5487 | desc, mdname(mddev)); | |
5fd6c1dc N |
5488 | mddev->recovery_cp = mddev->curr_resync; |
5489 | } | |
5490 | } else | |
5491 | mddev->recovery_cp = MaxSector; | |
5492 | } else { | |
5493 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5494 | mddev->curr_resync = MaxSector; | |
5495 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5496 | if (rdev->raid_disk >= 0 && | |
5497 | !test_bit(Faulty, &rdev->flags) && | |
5498 | !test_bit(In_sync, &rdev->flags) && | |
5499 | rdev->recovery_offset < mddev->curr_resync) | |
5500 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 5501 | } |
1da177e4 | 5502 | } |
17571284 | 5503 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5504 | |
1da177e4 LT |
5505 | skip: |
5506 | mddev->curr_resync = 0; | |
5507 | wake_up(&resync_wait); | |
5508 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
5509 | md_wakeup_thread(mddev->thread); | |
5510 | } | |
29269553 | 5511 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
5512 | |
5513 | ||
b4c4c7b8 N |
5514 | static int remove_and_add_spares(mddev_t *mddev) |
5515 | { | |
5516 | mdk_rdev_t *rdev; | |
5517 | struct list_head *rtmp; | |
5518 | int spares = 0; | |
5519 | ||
5520 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5521 | if (rdev->raid_disk >= 0 && | |
5522 | (test_bit(Faulty, &rdev->flags) || | |
5523 | ! test_bit(In_sync, &rdev->flags)) && | |
5524 | atomic_read(&rdev->nr_pending)==0) { | |
5525 | if (mddev->pers->hot_remove_disk( | |
5526 | mddev, rdev->raid_disk)==0) { | |
5527 | char nm[20]; | |
5528 | sprintf(nm,"rd%d", rdev->raid_disk); | |
5529 | sysfs_remove_link(&mddev->kobj, nm); | |
5530 | rdev->raid_disk = -1; | |
5531 | } | |
5532 | } | |
5533 | ||
5534 | if (mddev->degraded) { | |
5535 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5536 | if (rdev->raid_disk < 0 | |
5537 | && !test_bit(Faulty, &rdev->flags)) { | |
5538 | rdev->recovery_offset = 0; | |
5539 | if (mddev->pers->hot_add_disk(mddev,rdev)) { | |
5540 | char nm[20]; | |
5541 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
5542 | if (sysfs_create_link(&mddev->kobj, |
5543 | &rdev->kobj, nm)) | |
5544 | printk(KERN_WARNING | |
5545 | "md: cannot register " | |
5546 | "%s for %s\n", | |
5547 | nm, mdname(mddev)); | |
b4c4c7b8 N |
5548 | spares++; |
5549 | md_new_event(mddev); | |
5550 | } else | |
5551 | break; | |
5552 | } | |
5553 | } | |
5554 | return spares; | |
5555 | } | |
1da177e4 LT |
5556 | /* |
5557 | * This routine is regularly called by all per-raid-array threads to | |
5558 | * deal with generic issues like resync and super-block update. | |
5559 | * Raid personalities that don't have a thread (linear/raid0) do not | |
5560 | * need this as they never do any recovery or update the superblock. | |
5561 | * | |
5562 | * It does not do any resync itself, but rather "forks" off other threads | |
5563 | * to do that as needed. | |
5564 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
5565 | * "->recovery" and create a thread at ->sync_thread. | |
5566 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
5567 | * and wakeups up this thread which will reap the thread and finish up. | |
5568 | * This thread also removes any faulty devices (with nr_pending == 0). | |
5569 | * | |
5570 | * The overall approach is: | |
5571 | * 1/ if the superblock needs updating, update it. | |
5572 | * 2/ If a recovery thread is running, don't do anything else. | |
5573 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
5574 | * 4/ If there are any faulty devices, remove them. | |
5575 | * 5/ If array is degraded, try to add spares devices | |
5576 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
5577 | */ | |
5578 | void md_check_recovery(mddev_t *mddev) | |
5579 | { | |
5580 | mdk_rdev_t *rdev; | |
5581 | struct list_head *rtmp; | |
5582 | ||
5583 | ||
5f40402d N |
5584 | if (mddev->bitmap) |
5585 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
5586 | |
5587 | if (mddev->ro) | |
5588 | return; | |
fca4d848 N |
5589 | |
5590 | if (signal_pending(current)) { | |
5591 | if (mddev->pers->sync_request) { | |
5592 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
5593 | mdname(mddev)); | |
5594 | mddev->safemode = 2; | |
5595 | } | |
5596 | flush_signals(current); | |
5597 | } | |
5598 | ||
1da177e4 | 5599 | if ( ! ( |
850b2b42 | 5600 | mddev->flags || |
1da177e4 | 5601 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 N |
5602 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
5603 | (mddev->safemode == 1) || | |
5604 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
5605 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
5606 | )) |
5607 | return; | |
fca4d848 | 5608 | |
df5b89b3 | 5609 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 5610 | int spares = 0; |
fca4d848 | 5611 | |
a9701a30 | 5612 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
5613 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
5614 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
5615 | mddev->in_sync = 1; | |
850b2b42 | 5616 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
fca4d848 N |
5617 | } |
5618 | if (mddev->safemode == 1) | |
5619 | mddev->safemode = 0; | |
a9701a30 | 5620 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 5621 | |
850b2b42 N |
5622 | if (mddev->flags) |
5623 | md_update_sb(mddev, 0); | |
06d91a5f | 5624 | |
06d91a5f | 5625 | |
1da177e4 LT |
5626 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
5627 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
5628 | /* resync/recovery still happening */ | |
5629 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5630 | goto unlock; | |
5631 | } | |
5632 | if (mddev->sync_thread) { | |
5633 | /* resync has finished, collect result */ | |
5634 | md_unregister_thread(mddev->sync_thread); | |
5635 | mddev->sync_thread = NULL; | |
5636 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
5637 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5638 | /* success...*/ | |
5639 | /* activate any spares */ | |
5640 | mddev->pers->spare_active(mddev); | |
5641 | } | |
850b2b42 | 5642 | md_update_sb(mddev, 1); |
41158c7e N |
5643 | |
5644 | /* if array is no-longer degraded, then any saved_raid_disk | |
5645 | * information must be scrapped | |
5646 | */ | |
5647 | if (!mddev->degraded) | |
5648 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5649 | rdev->saved_raid_disk = -1; | |
5650 | ||
1da177e4 LT |
5651 | mddev->recovery = 0; |
5652 | /* flag recovery needed just to double check */ | |
5653 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 5654 | md_new_event(mddev); |
1da177e4 LT |
5655 | goto unlock; |
5656 | } | |
24dd469d N |
5657 | /* Clear some bits that don't mean anything, but |
5658 | * might be left set | |
5659 | */ | |
5660 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5661 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5662 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5663 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 5664 | |
5fd6c1dc N |
5665 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
5666 | goto unlock; | |
1da177e4 LT |
5667 | /* no recovery is running. |
5668 | * remove any failed drives, then | |
5669 | * add spares if possible. | |
5670 | * Spare are also removed and re-added, to allow | |
5671 | * the personality to fail the re-add. | |
5672 | */ | |
1da177e4 | 5673 | |
b4c4c7b8 N |
5674 | if (mddev->reshape_position != MaxSector) { |
5675 | if (mddev->pers->check_reshape(mddev) != 0) | |
5676 | /* Cannot proceed */ | |
5677 | goto unlock; | |
5678 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5679 | } else if ((spares = remove_and_add_spares(mddev))) { | |
24dd469d N |
5680 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
5681 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5682 | } else if (mddev->recovery_cp < MaxSector) { | |
5683 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
5684 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5685 | /* nothing to be done ... */ | |
1da177e4 | 5686 | goto unlock; |
24dd469d | 5687 | |
1da177e4 LT |
5688 | if (mddev->pers->sync_request) { |
5689 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
5690 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
5691 | /* We are adding a device or devices to an array | |
5692 | * which has the bitmap stored on all devices. | |
5693 | * So make sure all bitmap pages get written | |
5694 | */ | |
5695 | bitmap_write_all(mddev->bitmap); | |
5696 | } | |
1da177e4 LT |
5697 | mddev->sync_thread = md_register_thread(md_do_sync, |
5698 | mddev, | |
5699 | "%s_resync"); | |
5700 | if (!mddev->sync_thread) { | |
5701 | printk(KERN_ERR "%s: could not start resync" | |
5702 | " thread...\n", | |
5703 | mdname(mddev)); | |
5704 | /* leave the spares where they are, it shouldn't hurt */ | |
5705 | mddev->recovery = 0; | |
d7603b7e | 5706 | } else |
1da177e4 | 5707 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 5708 | md_new_event(mddev); |
1da177e4 LT |
5709 | } |
5710 | unlock: | |
5711 | mddev_unlock(mddev); | |
5712 | } | |
5713 | } | |
5714 | ||
75c96f85 AB |
5715 | static int md_notify_reboot(struct notifier_block *this, |
5716 | unsigned long code, void *x) | |
1da177e4 LT |
5717 | { |
5718 | struct list_head *tmp; | |
5719 | mddev_t *mddev; | |
5720 | ||
5721 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
5722 | ||
5723 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
5724 | ||
5725 | ITERATE_MDDEV(mddev,tmp) | |
c71d4887 | 5726 | if (mddev_trylock(mddev)) { |
1da177e4 | 5727 | do_md_stop (mddev, 1); |
c71d4887 NB |
5728 | mddev_unlock(mddev); |
5729 | } | |
1da177e4 LT |
5730 | /* |
5731 | * certain more exotic SCSI devices are known to be | |
5732 | * volatile wrt too early system reboots. While the | |
5733 | * right place to handle this issue is the given | |
5734 | * driver, we do want to have a safe RAID driver ... | |
5735 | */ | |
5736 | mdelay(1000*1); | |
5737 | } | |
5738 | return NOTIFY_DONE; | |
5739 | } | |
5740 | ||
75c96f85 | 5741 | static struct notifier_block md_notifier = { |
1da177e4 LT |
5742 | .notifier_call = md_notify_reboot, |
5743 | .next = NULL, | |
5744 | .priority = INT_MAX, /* before any real devices */ | |
5745 | }; | |
5746 | ||
5747 | static void md_geninit(void) | |
5748 | { | |
5749 | struct proc_dir_entry *p; | |
5750 | ||
5751 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
5752 | ||
5753 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
5754 | if (p) | |
5755 | p->proc_fops = &md_seq_fops; | |
5756 | } | |
5757 | ||
75c96f85 | 5758 | static int __init md_init(void) |
1da177e4 | 5759 | { |
1da177e4 LT |
5760 | if (register_blkdev(MAJOR_NR, "md")) |
5761 | return -1; | |
5762 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
5763 | unregister_blkdev(MAJOR_NR, "md"); | |
5764 | return -1; | |
5765 | } | |
e8703fe1 N |
5766 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
5767 | md_probe, NULL, NULL); | |
5768 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
5769 | md_probe, NULL, NULL); |
5770 | ||
1da177e4 | 5771 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 5772 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
5773 | |
5774 | md_geninit(); | |
5775 | return (0); | |
5776 | } | |
5777 | ||
5778 | ||
5779 | #ifndef MODULE | |
5780 | ||
5781 | /* | |
5782 | * Searches all registered partitions for autorun RAID arrays | |
5783 | * at boot time. | |
5784 | */ | |
5785 | static dev_t detected_devices[128]; | |
5786 | static int dev_cnt; | |
5787 | ||
5788 | void md_autodetect_dev(dev_t dev) | |
5789 | { | |
5790 | if (dev_cnt >= 0 && dev_cnt < 127) | |
5791 | detected_devices[dev_cnt++] = dev; | |
5792 | } | |
5793 | ||
5794 | ||
5795 | static void autostart_arrays(int part) | |
5796 | { | |
5797 | mdk_rdev_t *rdev; | |
5798 | int i; | |
5799 | ||
5800 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
5801 | ||
5802 | for (i = 0; i < dev_cnt; i++) { | |
5803 | dev_t dev = detected_devices[i]; | |
5804 | ||
df968c4e | 5805 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
5806 | if (IS_ERR(rdev)) |
5807 | continue; | |
5808 | ||
b2d444d7 | 5809 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5810 | MD_BUG(); |
5811 | continue; | |
5812 | } | |
5813 | list_add(&rdev->same_set, &pending_raid_disks); | |
5814 | } | |
5815 | dev_cnt = 0; | |
5816 | ||
5817 | autorun_devices(part); | |
5818 | } | |
5819 | ||
fdee8ae4 | 5820 | #endif /* !MODULE */ |
1da177e4 LT |
5821 | |
5822 | static __exit void md_exit(void) | |
5823 | { | |
5824 | mddev_t *mddev; | |
5825 | struct list_head *tmp; | |
8ab5e4c1 | 5826 | |
e8703fe1 N |
5827 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
5828 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
5829 | |
5830 | unregister_blkdev(MAJOR_NR,"md"); | |
5831 | unregister_blkdev(mdp_major, "mdp"); | |
5832 | unregister_reboot_notifier(&md_notifier); | |
5833 | unregister_sysctl_table(raid_table_header); | |
5834 | remove_proc_entry("mdstat", NULL); | |
5835 | ITERATE_MDDEV(mddev,tmp) { | |
5836 | struct gendisk *disk = mddev->gendisk; | |
5837 | if (!disk) | |
5838 | continue; | |
5839 | export_array(mddev); | |
5840 | del_gendisk(disk); | |
5841 | put_disk(disk); | |
5842 | mddev->gendisk = NULL; | |
5843 | mddev_put(mddev); | |
5844 | } | |
5845 | } | |
5846 | ||
685784aa | 5847 | subsys_initcall(md_init); |
1da177e4 LT |
5848 | module_exit(md_exit) |
5849 | ||
f91de92e N |
5850 | static int get_ro(char *buffer, struct kernel_param *kp) |
5851 | { | |
5852 | return sprintf(buffer, "%d", start_readonly); | |
5853 | } | |
5854 | static int set_ro(const char *val, struct kernel_param *kp) | |
5855 | { | |
5856 | char *e; | |
5857 | int num = simple_strtoul(val, &e, 10); | |
5858 | if (*val && (*e == '\0' || *e == '\n')) { | |
5859 | start_readonly = num; | |
4dbcdc75 | 5860 | return 0; |
f91de92e N |
5861 | } |
5862 | return -EINVAL; | |
5863 | } | |
5864 | ||
80ca3a44 N |
5865 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
5866 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 5867 | |
f91de92e | 5868 | |
1da177e4 LT |
5869 | EXPORT_SYMBOL(register_md_personality); |
5870 | EXPORT_SYMBOL(unregister_md_personality); | |
5871 | EXPORT_SYMBOL(md_error); | |
5872 | EXPORT_SYMBOL(md_done_sync); | |
5873 | EXPORT_SYMBOL(md_write_start); | |
5874 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
5875 | EXPORT_SYMBOL(md_register_thread); |
5876 | EXPORT_SYMBOL(md_unregister_thread); | |
5877 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
5878 | EXPORT_SYMBOL(md_check_recovery); |
5879 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 5880 | MODULE_ALIAS("md"); |
72008652 | 5881 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |