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 | ||
165125e1 | 214 | static int md_fail_request (struct request_queue *q, struct bio *bio) |
1da177e4 | 215 | { |
6712ecf8 | 216 | bio_io_error(bio); |
1da177e4 LT |
217 | return 0; |
218 | } | |
219 | ||
220 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
221 | { | |
222 | atomic_inc(&mddev->active); | |
223 | return mddev; | |
224 | } | |
225 | ||
226 | static void mddev_put(mddev_t *mddev) | |
227 | { | |
228 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
229 | return; | |
230 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
231 | list_del(&mddev->all_mddevs); | |
926ce2d8 | 232 | spin_unlock(&all_mddevs_lock); |
1312f40e | 233 | blk_cleanup_queue(mddev->queue); |
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 | ||
6712ecf8 | 387 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
388 | { |
389 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 390 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 391 | |
3a0f5bbb N |
392 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
393 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
394 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
395 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 396 | md_error(mddev, rdev); |
3a0f5bbb | 397 | } |
7bfa19f2 | 398 | |
a9701a30 N |
399 | if (atomic_dec_and_test(&mddev->pending_writes)) |
400 | wake_up(&mddev->sb_wait); | |
f8b58edf | 401 | bio_put(bio); |
7bfa19f2 N |
402 | } |
403 | ||
6712ecf8 | 404 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
405 | { |
406 | struct bio *bio2 = bio->bi_private; | |
407 | mdk_rdev_t *rdev = bio2->bi_private; | |
408 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
409 | |
410 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
411 | error == -EOPNOTSUPP) { | |
412 | unsigned long flags; | |
413 | /* barriers don't appear to be supported :-( */ | |
414 | set_bit(BarriersNotsupp, &rdev->flags); | |
415 | mddev->barriers_work = 0; | |
416 | spin_lock_irqsave(&mddev->write_lock, flags); | |
417 | bio2->bi_next = mddev->biolist; | |
418 | mddev->biolist = bio2; | |
419 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
420 | wake_up(&mddev->sb_wait); | |
421 | bio_put(bio); | |
6712ecf8 N |
422 | } else { |
423 | bio_put(bio2); | |
424 | bio->bi_private = rdev; | |
425 | super_written(bio, error); | |
a9701a30 | 426 | } |
a9701a30 N |
427 | } |
428 | ||
7bfa19f2 N |
429 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
430 | sector_t sector, int size, struct page *page) | |
431 | { | |
432 | /* write first size bytes of page to sector of rdev | |
433 | * Increment mddev->pending_writes before returning | |
434 | * and decrement it on completion, waking up sb_wait | |
435 | * if zero is reached. | |
436 | * If an error occurred, call md_error | |
a9701a30 N |
437 | * |
438 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
439 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
440 | */ |
441 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 442 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
443 | |
444 | bio->bi_bdev = rdev->bdev; | |
445 | bio->bi_sector = sector; | |
446 | bio_add_page(bio, page, size, 0); | |
447 | bio->bi_private = rdev; | |
448 | bio->bi_end_io = super_written; | |
a9701a30 N |
449 | bio->bi_rw = rw; |
450 | ||
7bfa19f2 | 451 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
452 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
453 | struct bio *rbio; | |
454 | rw |= (1<<BIO_RW_BARRIER); | |
455 | rbio = bio_clone(bio, GFP_NOIO); | |
456 | rbio->bi_private = bio; | |
457 | rbio->bi_end_io = super_written_barrier; | |
458 | submit_bio(rw, rbio); | |
459 | } else | |
460 | submit_bio(rw, bio); | |
461 | } | |
462 | ||
463 | void md_super_wait(mddev_t *mddev) | |
464 | { | |
465 | /* wait for all superblock writes that were scheduled to complete. | |
466 | * if any had to be retried (due to BARRIER problems), retry them | |
467 | */ | |
468 | DEFINE_WAIT(wq); | |
469 | for(;;) { | |
470 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
471 | if (atomic_read(&mddev->pending_writes)==0) | |
472 | break; | |
473 | while (mddev->biolist) { | |
474 | struct bio *bio; | |
475 | spin_lock_irq(&mddev->write_lock); | |
476 | bio = mddev->biolist; | |
477 | mddev->biolist = bio->bi_next ; | |
478 | bio->bi_next = NULL; | |
479 | spin_unlock_irq(&mddev->write_lock); | |
480 | submit_bio(bio->bi_rw, bio); | |
481 | } | |
482 | schedule(); | |
483 | } | |
484 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
485 | } |
486 | ||
6712ecf8 | 487 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 488 | { |
1da177e4 | 489 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
490 | } |
491 | ||
a654b9d8 | 492 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
493 | struct page *page, int rw) |
494 | { | |
baaa2c51 | 495 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
496 | struct completion event; |
497 | int ret; | |
498 | ||
499 | rw |= (1 << BIO_RW_SYNC); | |
500 | ||
501 | bio->bi_bdev = bdev; | |
502 | bio->bi_sector = sector; | |
503 | bio_add_page(bio, page, size, 0); | |
504 | init_completion(&event); | |
505 | bio->bi_private = &event; | |
506 | bio->bi_end_io = bi_complete; | |
507 | submit_bio(rw, bio); | |
508 | wait_for_completion(&event); | |
509 | ||
510 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
511 | bio_put(bio); | |
512 | return ret; | |
513 | } | |
a8745db2 | 514 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 515 | |
0002b271 | 516 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
517 | { |
518 | char b[BDEVNAME_SIZE]; | |
519 | if (!rdev->sb_page) { | |
520 | MD_BUG(); | |
521 | return -EINVAL; | |
522 | } | |
523 | if (rdev->sb_loaded) | |
524 | return 0; | |
525 | ||
526 | ||
0002b271 | 527 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
528 | goto fail; |
529 | rdev->sb_loaded = 1; | |
530 | return 0; | |
531 | ||
532 | fail: | |
533 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
534 | bdevname(rdev->bdev,b)); | |
535 | return -EINVAL; | |
536 | } | |
537 | ||
538 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
539 | { | |
540 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
541 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
542 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
543 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
544 | ||
545 | return 1; | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | ||
551 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
552 | { | |
553 | int ret; | |
554 | mdp_super_t *tmp1, *tmp2; | |
555 | ||
556 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
557 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
558 | ||
559 | if (!tmp1 || !tmp2) { | |
560 | ret = 0; | |
561 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
562 | goto abort; | |
563 | } | |
564 | ||
565 | *tmp1 = *sb1; | |
566 | *tmp2 = *sb2; | |
567 | ||
568 | /* | |
569 | * nr_disks is not constant | |
570 | */ | |
571 | tmp1->nr_disks = 0; | |
572 | tmp2->nr_disks = 0; | |
573 | ||
574 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
575 | ret = 0; | |
576 | else | |
577 | ret = 1; | |
578 | ||
579 | abort: | |
990a8baf JJ |
580 | kfree(tmp1); |
581 | kfree(tmp2); | |
1da177e4 LT |
582 | return ret; |
583 | } | |
584 | ||
4d167f09 N |
585 | |
586 | static u32 md_csum_fold(u32 csum) | |
587 | { | |
588 | csum = (csum & 0xffff) + (csum >> 16); | |
589 | return (csum & 0xffff) + (csum >> 16); | |
590 | } | |
591 | ||
1da177e4 LT |
592 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
593 | { | |
4d167f09 N |
594 | u64 newcsum = 0; |
595 | u32 *sb32 = (u32*)sb; | |
596 | int i; | |
1da177e4 LT |
597 | unsigned int disk_csum, csum; |
598 | ||
599 | disk_csum = sb->sb_csum; | |
600 | sb->sb_csum = 0; | |
4d167f09 N |
601 | |
602 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
603 | newcsum += sb32[i]; | |
604 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
605 | ||
606 | ||
607 | #ifdef CONFIG_ALPHA | |
608 | /* This used to use csum_partial, which was wrong for several | |
609 | * reasons including that different results are returned on | |
610 | * different architectures. It isn't critical that we get exactly | |
611 | * the same return value as before (we always csum_fold before | |
612 | * testing, and that removes any differences). However as we | |
613 | * know that csum_partial always returned a 16bit value on | |
614 | * alphas, do a fold to maximise conformity to previous behaviour. | |
615 | */ | |
616 | sb->sb_csum = md_csum_fold(disk_csum); | |
617 | #else | |
1da177e4 | 618 | sb->sb_csum = disk_csum; |
4d167f09 | 619 | #endif |
1da177e4 LT |
620 | return csum; |
621 | } | |
622 | ||
623 | ||
624 | /* | |
625 | * Handle superblock details. | |
626 | * We want to be able to handle multiple superblock formats | |
627 | * so we have a common interface to them all, and an array of | |
628 | * different handlers. | |
629 | * We rely on user-space to write the initial superblock, and support | |
630 | * reading and updating of superblocks. | |
631 | * Interface methods are: | |
632 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
633 | * loads and validates a superblock on dev. | |
634 | * if refdev != NULL, compare superblocks on both devices | |
635 | * Return: | |
636 | * 0 - dev has a superblock that is compatible with refdev | |
637 | * 1 - dev has a superblock that is compatible and newer than refdev | |
638 | * so dev should be used as the refdev in future | |
639 | * -EINVAL superblock incompatible or invalid | |
640 | * -othererror e.g. -EIO | |
641 | * | |
642 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
643 | * Verify that dev is acceptable into mddev. | |
644 | * The first time, mddev->raid_disks will be 0, and data from | |
645 | * dev should be merged in. Subsequent calls check that dev | |
646 | * is new enough. Return 0 or -EINVAL | |
647 | * | |
648 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
649 | * Update the superblock for rdev with data in mddev | |
650 | * This does not write to disc. | |
651 | * | |
652 | */ | |
653 | ||
654 | struct super_type { | |
655 | char *name; | |
656 | struct module *owner; | |
657 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
658 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
659 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
660 | }; | |
661 | ||
662 | /* | |
663 | * load_super for 0.90.0 | |
664 | */ | |
665 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
666 | { | |
667 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
668 | mdp_super_t *sb; | |
669 | int ret; | |
670 | sector_t sb_offset; | |
671 | ||
672 | /* | |
673 | * Calculate the position of the superblock, | |
674 | * it's at the end of the disk. | |
675 | * | |
676 | * It also happens to be a multiple of 4Kb. | |
677 | */ | |
678 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
679 | rdev->sb_offset = sb_offset; | |
680 | ||
0002b271 | 681 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
682 | if (ret) return ret; |
683 | ||
684 | ret = -EINVAL; | |
685 | ||
686 | bdevname(rdev->bdev, b); | |
687 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
688 | ||
689 | if (sb->md_magic != MD_SB_MAGIC) { | |
690 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
691 | b); | |
692 | goto abort; | |
693 | } | |
694 | ||
695 | if (sb->major_version != 0 || | |
f6705578 N |
696 | sb->minor_version < 90 || |
697 | sb->minor_version > 91) { | |
1da177e4 LT |
698 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
699 | sb->major_version, sb->minor_version, | |
700 | b); | |
701 | goto abort; | |
702 | } | |
703 | ||
704 | if (sb->raid_disks <= 0) | |
705 | goto abort; | |
706 | ||
4d167f09 | 707 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
708 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
709 | b); | |
710 | goto abort; | |
711 | } | |
712 | ||
713 | rdev->preferred_minor = sb->md_minor; | |
714 | rdev->data_offset = 0; | |
0002b271 | 715 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 716 | |
e11e93fa N |
717 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
718 | if (sb->level != 1 && sb->level != 4 | |
719 | && sb->level != 5 && sb->level != 6 | |
720 | && sb->level != 10) { | |
721 | /* FIXME use a better test */ | |
722 | printk(KERN_WARNING | |
723 | "md: bitmaps not supported for this level.\n"); | |
724 | goto abort; | |
725 | } | |
726 | } | |
727 | ||
1da177e4 LT |
728 | if (sb->level == LEVEL_MULTIPATH) |
729 | rdev->desc_nr = -1; | |
730 | else | |
731 | rdev->desc_nr = sb->this_disk.number; | |
732 | ||
733 | if (refdev == 0) | |
734 | ret = 1; | |
735 | else { | |
736 | __u64 ev1, ev2; | |
737 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
738 | if (!uuid_equal(refsb, sb)) { | |
739 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
740 | b, bdevname(refdev->bdev,b2)); | |
741 | goto abort; | |
742 | } | |
743 | if (!sb_equal(refsb, sb)) { | |
744 | printk(KERN_WARNING "md: %s has same UUID" | |
745 | " but different superblock to %s\n", | |
746 | b, bdevname(refdev->bdev, b2)); | |
747 | goto abort; | |
748 | } | |
749 | ev1 = md_event(sb); | |
750 | ev2 = md_event(refsb); | |
751 | if (ev1 > ev2) | |
752 | ret = 1; | |
753 | else | |
754 | ret = 0; | |
755 | } | |
756 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
757 | ||
2bf071bf N |
758 | if (rdev->size < sb->size && sb->level > 1) |
759 | /* "this cannot possibly happen" ... */ | |
760 | ret = -EINVAL; | |
761 | ||
1da177e4 LT |
762 | abort: |
763 | return ret; | |
764 | } | |
765 | ||
766 | /* | |
767 | * validate_super for 0.90.0 | |
768 | */ | |
769 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
770 | { | |
771 | mdp_disk_t *desc; | |
772 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 773 | __u64 ev1 = md_event(sb); |
1da177e4 | 774 | |
41158c7e | 775 | rdev->raid_disk = -1; |
b2d444d7 | 776 | rdev->flags = 0; |
1da177e4 LT |
777 | if (mddev->raid_disks == 0) { |
778 | mddev->major_version = 0; | |
779 | mddev->minor_version = sb->minor_version; | |
780 | mddev->patch_version = sb->patch_version; | |
781 | mddev->persistent = ! sb->not_persistent; | |
782 | mddev->chunk_size = sb->chunk_size; | |
783 | mddev->ctime = sb->ctime; | |
784 | mddev->utime = sb->utime; | |
785 | mddev->level = sb->level; | |
d9d166c2 | 786 | mddev->clevel[0] = 0; |
1da177e4 LT |
787 | mddev->layout = sb->layout; |
788 | mddev->raid_disks = sb->raid_disks; | |
789 | mddev->size = sb->size; | |
07d84d10 | 790 | mddev->events = ev1; |
9223214e | 791 | mddev->bitmap_offset = 0; |
36fa3063 | 792 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 793 | |
f6705578 N |
794 | if (mddev->minor_version >= 91) { |
795 | mddev->reshape_position = sb->reshape_position; | |
796 | mddev->delta_disks = sb->delta_disks; | |
797 | mddev->new_level = sb->new_level; | |
798 | mddev->new_layout = sb->new_layout; | |
799 | mddev->new_chunk = sb->new_chunk; | |
800 | } else { | |
801 | mddev->reshape_position = MaxSector; | |
802 | mddev->delta_disks = 0; | |
803 | mddev->new_level = mddev->level; | |
804 | mddev->new_layout = mddev->layout; | |
805 | mddev->new_chunk = mddev->chunk_size; | |
806 | } | |
807 | ||
1da177e4 LT |
808 | if (sb->state & (1<<MD_SB_CLEAN)) |
809 | mddev->recovery_cp = MaxSector; | |
810 | else { | |
811 | if (sb->events_hi == sb->cp_events_hi && | |
812 | sb->events_lo == sb->cp_events_lo) { | |
813 | mddev->recovery_cp = sb->recovery_cp; | |
814 | } else | |
815 | mddev->recovery_cp = 0; | |
816 | } | |
817 | ||
818 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
819 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
820 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
821 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
822 | ||
823 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
824 | |
825 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 826 | mddev->bitmap_file == NULL) |
36fa3063 | 827 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 828 | |
41158c7e N |
829 | } else if (mddev->pers == NULL) { |
830 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
831 | ++ev1; |
832 | if (ev1 < mddev->events) | |
833 | return -EINVAL; | |
41158c7e N |
834 | } else if (mddev->bitmap) { |
835 | /* if adding to array with a bitmap, then we can accept an | |
836 | * older device ... but not too old. | |
837 | */ | |
41158c7e N |
838 | if (ev1 < mddev->bitmap->events_cleared) |
839 | return 0; | |
07d84d10 N |
840 | } else { |
841 | if (ev1 < mddev->events) | |
842 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
843 | return 0; | |
844 | } | |
41158c7e | 845 | |
1da177e4 | 846 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
847 | desc = sb->disks + rdev->desc_nr; |
848 | ||
849 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 850 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
851 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
852 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 853 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
854 | rdev->raid_disk = desc->raid_disk; |
855 | } | |
8ddf9efe N |
856 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
857 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 858 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 859 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
860 | return 0; |
861 | } | |
862 | ||
863 | /* | |
864 | * sync_super for 0.90.0 | |
865 | */ | |
866 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
867 | { | |
868 | mdp_super_t *sb; | |
869 | struct list_head *tmp; | |
870 | mdk_rdev_t *rdev2; | |
871 | int next_spare = mddev->raid_disks; | |
19133a42 | 872 | |
1da177e4 LT |
873 | |
874 | /* make rdev->sb match mddev data.. | |
875 | * | |
876 | * 1/ zero out disks | |
877 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
878 | * 3/ any empty disks < next_spare become removed | |
879 | * | |
880 | * disks[0] gets initialised to REMOVED because | |
881 | * we cannot be sure from other fields if it has | |
882 | * been initialised or not. | |
883 | */ | |
884 | int i; | |
885 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
886 | ||
61181565 N |
887 | rdev->sb_size = MD_SB_BYTES; |
888 | ||
1da177e4 LT |
889 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
890 | ||
891 | memset(sb, 0, sizeof(*sb)); | |
892 | ||
893 | sb->md_magic = MD_SB_MAGIC; | |
894 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
895 | sb->patch_version = mddev->patch_version; |
896 | sb->gvalid_words = 0; /* ignored */ | |
897 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
898 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
899 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
900 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
901 | ||
902 | sb->ctime = mddev->ctime; | |
903 | sb->level = mddev->level; | |
904 | sb->size = mddev->size; | |
905 | sb->raid_disks = mddev->raid_disks; | |
906 | sb->md_minor = mddev->md_minor; | |
907 | sb->not_persistent = !mddev->persistent; | |
908 | sb->utime = mddev->utime; | |
909 | sb->state = 0; | |
910 | sb->events_hi = (mddev->events>>32); | |
911 | sb->events_lo = (u32)mddev->events; | |
912 | ||
f6705578 N |
913 | if (mddev->reshape_position == MaxSector) |
914 | sb->minor_version = 90; | |
915 | else { | |
916 | sb->minor_version = 91; | |
917 | sb->reshape_position = mddev->reshape_position; | |
918 | sb->new_level = mddev->new_level; | |
919 | sb->delta_disks = mddev->delta_disks; | |
920 | sb->new_layout = mddev->new_layout; | |
921 | sb->new_chunk = mddev->new_chunk; | |
922 | } | |
923 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
924 | if (mddev->in_sync) |
925 | { | |
926 | sb->recovery_cp = mddev->recovery_cp; | |
927 | sb->cp_events_hi = (mddev->events>>32); | |
928 | sb->cp_events_lo = (u32)mddev->events; | |
929 | if (mddev->recovery_cp == MaxSector) | |
930 | sb->state = (1<< MD_SB_CLEAN); | |
931 | } else | |
932 | sb->recovery_cp = 0; | |
933 | ||
934 | sb->layout = mddev->layout; | |
935 | sb->chunk_size = mddev->chunk_size; | |
936 | ||
a654b9d8 N |
937 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
938 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
939 | ||
1da177e4 LT |
940 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
941 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
942 | mdp_disk_t *d; | |
86e6ffdd | 943 | int desc_nr; |
b2d444d7 N |
944 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
945 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 946 | desc_nr = rdev2->raid_disk; |
1da177e4 | 947 | else |
86e6ffdd | 948 | desc_nr = next_spare++; |
19133a42 | 949 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
950 | d = &sb->disks[rdev2->desc_nr]; |
951 | nr_disks++; | |
952 | d->number = rdev2->desc_nr; | |
953 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
954 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
955 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
956 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
957 | d->raid_disk = rdev2->raid_disk; |
958 | else | |
959 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 960 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 961 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 962 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
963 | d->state = (1<<MD_DISK_ACTIVE); |
964 | d->state |= (1<<MD_DISK_SYNC); | |
965 | active++; | |
966 | working++; | |
967 | } else { | |
968 | d->state = 0; | |
969 | spare++; | |
970 | working++; | |
971 | } | |
8ddf9efe N |
972 | if (test_bit(WriteMostly, &rdev2->flags)) |
973 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 974 | } |
1da177e4 LT |
975 | /* now set the "removed" and "faulty" bits on any missing devices */ |
976 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
977 | mdp_disk_t *d = &sb->disks[i]; | |
978 | if (d->state == 0 && d->number == 0) { | |
979 | d->number = i; | |
980 | d->raid_disk = i; | |
981 | d->state = (1<<MD_DISK_REMOVED); | |
982 | d->state |= (1<<MD_DISK_FAULTY); | |
983 | failed++; | |
984 | } | |
985 | } | |
986 | sb->nr_disks = nr_disks; | |
987 | sb->active_disks = active; | |
988 | sb->working_disks = working; | |
989 | sb->failed_disks = failed; | |
990 | sb->spare_disks = spare; | |
991 | ||
992 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
993 | sb->sb_csum = calc_sb_csum(sb); | |
994 | } | |
995 | ||
996 | /* | |
997 | * version 1 superblock | |
998 | */ | |
999 | ||
1c05b4bc | 1000 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1001 | { |
1c05b4bc N |
1002 | __le32 disk_csum; |
1003 | u32 csum; | |
1da177e4 LT |
1004 | unsigned long long newcsum; |
1005 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1006 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1007 | int i; |
1008 | ||
1009 | disk_csum = sb->sb_csum; | |
1010 | sb->sb_csum = 0; | |
1011 | newcsum = 0; | |
1012 | for (i=0; size>=4; size -= 4 ) | |
1013 | newcsum += le32_to_cpu(*isuper++); | |
1014 | ||
1015 | if (size == 2) | |
1c05b4bc | 1016 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1017 | |
1018 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1019 | sb->sb_csum = disk_csum; | |
1020 | return cpu_to_le32(csum); | |
1021 | } | |
1022 | ||
1023 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1024 | { | |
1025 | struct mdp_superblock_1 *sb; | |
1026 | int ret; | |
1027 | sector_t sb_offset; | |
1028 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 1029 | int bmask; |
1da177e4 LT |
1030 | |
1031 | /* | |
1032 | * Calculate the position of the superblock. | |
1033 | * It is always aligned to a 4K boundary and | |
1034 | * depeding on minor_version, it can be: | |
1035 | * 0: At least 8K, but less than 12K, from end of device | |
1036 | * 1: At start of device | |
1037 | * 2: 4K from start of device. | |
1038 | */ | |
1039 | switch(minor_version) { | |
1040 | case 0: | |
1041 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
1042 | sb_offset -= 8*2; | |
39730960 | 1043 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
1044 | /* convert from sectors to K */ |
1045 | sb_offset /= 2; | |
1046 | break; | |
1047 | case 1: | |
1048 | sb_offset = 0; | |
1049 | break; | |
1050 | case 2: | |
1051 | sb_offset = 4; | |
1052 | break; | |
1053 | default: | |
1054 | return -EINVAL; | |
1055 | } | |
1056 | rdev->sb_offset = sb_offset; | |
1057 | ||
0002b271 N |
1058 | /* superblock is rarely larger than 1K, but it can be larger, |
1059 | * and it is safe to read 4k, so we do that | |
1060 | */ | |
1061 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1062 | if (ret) return ret; |
1063 | ||
1064 | ||
1065 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1066 | ||
1067 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1068 | sb->major_version != cpu_to_le32(1) || | |
1069 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
1070 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 1071 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1072 | return -EINVAL; |
1073 | ||
1074 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1075 | printk("md: invalid superblock checksum on %s\n", | |
1076 | bdevname(rdev->bdev,b)); | |
1077 | return -EINVAL; | |
1078 | } | |
1079 | if (le64_to_cpu(sb->data_size) < 10) { | |
1080 | printk("md: data_size too small on %s\n", | |
1081 | bdevname(rdev->bdev,b)); | |
1082 | return -EINVAL; | |
1083 | } | |
e11e93fa N |
1084 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1085 | if (sb->level != cpu_to_le32(1) && | |
1086 | sb->level != cpu_to_le32(4) && | |
1087 | sb->level != cpu_to_le32(5) && | |
1088 | sb->level != cpu_to_le32(6) && | |
1089 | sb->level != cpu_to_le32(10)) { | |
1090 | printk(KERN_WARNING | |
1091 | "md: bitmaps not supported for this level.\n"); | |
1092 | return -EINVAL; | |
1093 | } | |
1094 | } | |
1095 | ||
1da177e4 LT |
1096 | rdev->preferred_minor = 0xffff; |
1097 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1098 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1099 | |
0002b271 | 1100 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1101 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
1102 | if (rdev->sb_size & bmask) |
1103 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
1104 | ||
31b65a0d N |
1105 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1106 | rdev->desc_nr = -1; | |
1107 | else | |
1108 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1109 | ||
1da177e4 | 1110 | if (refdev == 0) |
8ed75463 | 1111 | ret = 1; |
1da177e4 LT |
1112 | else { |
1113 | __u64 ev1, ev2; | |
1114 | struct mdp_superblock_1 *refsb = | |
1115 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1116 | ||
1117 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1118 | sb->level != refsb->level || | |
1119 | sb->layout != refsb->layout || | |
1120 | sb->chunksize != refsb->chunksize) { | |
1121 | printk(KERN_WARNING "md: %s has strangely different" | |
1122 | " superblock to %s\n", | |
1123 | bdevname(rdev->bdev,b), | |
1124 | bdevname(refdev->bdev,b2)); | |
1125 | return -EINVAL; | |
1126 | } | |
1127 | ev1 = le64_to_cpu(sb->events); | |
1128 | ev2 = le64_to_cpu(refsb->events); | |
1129 | ||
1130 | if (ev1 > ev2) | |
8ed75463 N |
1131 | ret = 1; |
1132 | else | |
1133 | ret = 0; | |
1da177e4 LT |
1134 | } |
1135 | if (minor_version) | |
1136 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1137 | else | |
1138 | rdev->size = rdev->sb_offset; | |
1139 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1140 | return -EINVAL; | |
1141 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1142 | if (le32_to_cpu(sb->chunksize)) | |
1143 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1144 | |
1c05b4bc | 1145 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1146 | return -EINVAL; |
8ed75463 | 1147 | return ret; |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1151 | { | |
1152 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1153 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1154 | |
41158c7e | 1155 | rdev->raid_disk = -1; |
b2d444d7 | 1156 | rdev->flags = 0; |
1da177e4 LT |
1157 | if (mddev->raid_disks == 0) { |
1158 | mddev->major_version = 1; | |
1159 | mddev->patch_version = 0; | |
1160 | mddev->persistent = 1; | |
1161 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
1162 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1163 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1164 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1165 | mddev->clevel[0] = 0; |
1da177e4 LT |
1166 | mddev->layout = le32_to_cpu(sb->layout); |
1167 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1168 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1169 | mddev->events = ev1; |
9223214e | 1170 | mddev->bitmap_offset = 0; |
29fc7e3e | 1171 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1172 | |
1173 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1174 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1175 | ||
1176 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1177 | |
71c0805c | 1178 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1179 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1180 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1181 | |
f6705578 N |
1182 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1183 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1184 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1185 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1186 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1187 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1188 | } else { | |
1189 | mddev->reshape_position = MaxSector; | |
1190 | mddev->delta_disks = 0; | |
1191 | mddev->new_level = mddev->level; | |
1192 | mddev->new_layout = mddev->layout; | |
1193 | mddev->new_chunk = mddev->chunk_size; | |
1194 | } | |
1195 | ||
41158c7e N |
1196 | } else if (mddev->pers == NULL) { |
1197 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1198 | ++ev1; |
1199 | if (ev1 < mddev->events) | |
1200 | return -EINVAL; | |
41158c7e N |
1201 | } else if (mddev->bitmap) { |
1202 | /* If adding to array with a bitmap, then we can accept an | |
1203 | * older device, but not too old. | |
1204 | */ | |
41158c7e N |
1205 | if (ev1 < mddev->bitmap->events_cleared) |
1206 | return 0; | |
07d84d10 N |
1207 | } else { |
1208 | if (ev1 < mddev->events) | |
1209 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1210 | return 0; | |
1211 | } | |
1da177e4 LT |
1212 | if (mddev->level != LEVEL_MULTIPATH) { |
1213 | int role; | |
1da177e4 LT |
1214 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1215 | switch(role) { | |
1216 | case 0xffff: /* spare */ | |
1da177e4 LT |
1217 | break; |
1218 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1219 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1220 | break; |
1221 | default: | |
5fd6c1dc N |
1222 | if ((le32_to_cpu(sb->feature_map) & |
1223 | MD_FEATURE_RECOVERY_OFFSET)) | |
1224 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1225 | else | |
1226 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1227 | rdev->raid_disk = role; |
1228 | break; | |
1229 | } | |
8ddf9efe N |
1230 | if (sb->devflags & WriteMostly1) |
1231 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1232 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1233 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1234 | |
1da177e4 LT |
1235 | return 0; |
1236 | } | |
1237 | ||
1238 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1239 | { | |
1240 | struct mdp_superblock_1 *sb; | |
1241 | struct list_head *tmp; | |
1242 | mdk_rdev_t *rdev2; | |
1243 | int max_dev, i; | |
1244 | /* make rdev->sb match mddev and rdev data. */ | |
1245 | ||
1246 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1247 | ||
1248 | sb->feature_map = 0; | |
1249 | sb->pad0 = 0; | |
5fd6c1dc | 1250 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1251 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1252 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1253 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1254 | ||
1255 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1256 | sb->events = cpu_to_le64(mddev->events); | |
1257 | if (mddev->in_sync) | |
1258 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1259 | else | |
1260 | sb->resync_offset = cpu_to_le64(0); | |
1261 | ||
1c05b4bc | 1262 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1263 | |
f0ca340c | 1264 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1265 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1266 | |
a654b9d8 N |
1267 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1268 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1269 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1270 | } |
5fd6c1dc N |
1271 | |
1272 | if (rdev->raid_disk >= 0 && | |
1273 | !test_bit(In_sync, &rdev->flags) && | |
1274 | rdev->recovery_offset > 0) { | |
1275 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1276 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1277 | } | |
1278 | ||
f6705578 N |
1279 | if (mddev->reshape_position != MaxSector) { |
1280 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1281 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1282 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1283 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1284 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1285 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1286 | } | |
a654b9d8 | 1287 | |
1da177e4 LT |
1288 | max_dev = 0; |
1289 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1290 | if (rdev2->desc_nr+1 > max_dev) | |
1291 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1292 | |
1293 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1294 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1295 | for (i=0; i<max_dev;i++) |
1296 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1297 | ||
1298 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1299 | i = rdev2->desc_nr; | |
b2d444d7 | 1300 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1301 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1302 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1303 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1304 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1305 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1306 | else |
1307 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1308 | } | |
1309 | ||
1da177e4 LT |
1310 | sb->sb_csum = calc_sb_1_csum(sb); |
1311 | } | |
1312 | ||
1313 | ||
75c96f85 | 1314 | static struct super_type super_types[] = { |
1da177e4 LT |
1315 | [0] = { |
1316 | .name = "0.90.0", | |
1317 | .owner = THIS_MODULE, | |
1318 | .load_super = super_90_load, | |
1319 | .validate_super = super_90_validate, | |
1320 | .sync_super = super_90_sync, | |
1321 | }, | |
1322 | [1] = { | |
1323 | .name = "md-1", | |
1324 | .owner = THIS_MODULE, | |
1325 | .load_super = super_1_load, | |
1326 | .validate_super = super_1_validate, | |
1327 | .sync_super = super_1_sync, | |
1328 | }, | |
1329 | }; | |
1da177e4 LT |
1330 | |
1331 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1332 | { | |
7dd5e7c3 N |
1333 | struct list_head *tmp, *tmp2; |
1334 | mdk_rdev_t *rdev, *rdev2; | |
1da177e4 LT |
1335 | |
1336 | ITERATE_RDEV(mddev1,rdev,tmp) | |
7dd5e7c3 N |
1337 | ITERATE_RDEV(mddev2, rdev2, tmp2) |
1338 | if (rdev->bdev->bd_contains == | |
1339 | rdev2->bdev->bd_contains) | |
1340 | return 1; | |
1da177e4 LT |
1341 | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | static LIST_HEAD(pending_raid_disks); | |
1346 | ||
1347 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1348 | { | |
7dd5e7c3 | 1349 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1350 | struct kobject *ko; |
1edf80d3 | 1351 | char *s; |
5e55e2f5 | 1352 | int err; |
1da177e4 LT |
1353 | |
1354 | if (rdev->mddev) { | |
1355 | MD_BUG(); | |
1356 | return -EINVAL; | |
1357 | } | |
2bf071bf N |
1358 | /* make sure rdev->size exceeds mddev->size */ |
1359 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1360 | if (mddev->pers) { |
1361 | /* Cannot change size, so fail | |
1362 | * If mddev->level <= 0, then we don't care | |
1363 | * about aligning sizes (e.g. linear) | |
1364 | */ | |
1365 | if (mddev->level > 0) | |
1366 | return -ENOSPC; | |
1367 | } else | |
2bf071bf N |
1368 | mddev->size = rdev->size; |
1369 | } | |
1da177e4 LT |
1370 | |
1371 | /* Verify rdev->desc_nr is unique. | |
1372 | * If it is -1, assign a free number, else | |
1373 | * check number is not in use | |
1374 | */ | |
1375 | if (rdev->desc_nr < 0) { | |
1376 | int choice = 0; | |
1377 | if (mddev->pers) choice = mddev->raid_disks; | |
1378 | while (find_rdev_nr(mddev, choice)) | |
1379 | choice++; | |
1380 | rdev->desc_nr = choice; | |
1381 | } else { | |
1382 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1383 | return -EBUSY; | |
1384 | } | |
19133a42 N |
1385 | bdevname(rdev->bdev,b); |
1386 | if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) | |
1387 | return -ENOMEM; | |
1edf80d3 NB |
1388 | while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL) |
1389 | *s = '!'; | |
1da177e4 | 1390 | |
1da177e4 | 1391 | rdev->mddev = mddev; |
19133a42 | 1392 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1393 | |
9c791977 | 1394 | rdev->kobj.parent = &mddev->kobj; |
5e55e2f5 N |
1395 | if ((err = kobject_add(&rdev->kobj))) |
1396 | goto fail; | |
86e6ffdd | 1397 | |
f637b9f9 N |
1398 | if (rdev->bdev->bd_part) |
1399 | ko = &rdev->bdev->bd_part->kobj; | |
1400 | else | |
1401 | ko = &rdev->bdev->bd_disk->kobj; | |
5e55e2f5 N |
1402 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1403 | kobject_del(&rdev->kobj); | |
1404 | goto fail; | |
1405 | } | |
1406 | list_add(&rdev->same_set, &mddev->disks); | |
5463c790 | 1407 | bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk); |
1da177e4 | 1408 | return 0; |
5e55e2f5 N |
1409 | |
1410 | fail: | |
1411 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1412 | b, mdname(mddev)); | |
1413 | return err; | |
1da177e4 LT |
1414 | } |
1415 | ||
5792a285 N |
1416 | static void delayed_delete(struct work_struct *ws) |
1417 | { | |
1418 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1419 | kobject_del(&rdev->kobj); | |
1420 | } | |
1421 | ||
1da177e4 LT |
1422 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1423 | { | |
1424 | char b[BDEVNAME_SIZE]; | |
1425 | if (!rdev->mddev) { | |
1426 | MD_BUG(); | |
1427 | return; | |
1428 | } | |
5463c790 | 1429 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
1da177e4 LT |
1430 | list_del_init(&rdev->same_set); |
1431 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1432 | rdev->mddev = NULL; | |
86e6ffdd | 1433 | sysfs_remove_link(&rdev->kobj, "block"); |
5792a285 N |
1434 | |
1435 | /* We need to delay this, otherwise we can deadlock when | |
1436 | * writing to 'remove' to "dev/state" | |
1437 | */ | |
1438 | INIT_WORK(&rdev->del_work, delayed_delete); | |
1439 | schedule_work(&rdev->del_work); | |
1da177e4 LT |
1440 | } |
1441 | ||
1442 | /* | |
1443 | * prevent the device from being mounted, repartitioned or | |
1444 | * otherwise reused by a RAID array (or any other kernel | |
1445 | * subsystem), by bd_claiming the device. | |
1446 | */ | |
1447 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1448 | { | |
1449 | int err = 0; | |
1450 | struct block_device *bdev; | |
1451 | char b[BDEVNAME_SIZE]; | |
1452 | ||
2e7b651d | 1453 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1454 | if (IS_ERR(bdev)) { |
1455 | printk(KERN_ERR "md: could not open %s.\n", | |
1456 | __bdevname(dev, b)); | |
1457 | return PTR_ERR(bdev); | |
1458 | } | |
1459 | err = bd_claim(bdev, rdev); | |
1460 | if (err) { | |
1461 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1462 | bdevname(bdev, b)); | |
2e7b651d | 1463 | blkdev_put(bdev); |
1da177e4 LT |
1464 | return err; |
1465 | } | |
1466 | rdev->bdev = bdev; | |
1467 | return err; | |
1468 | } | |
1469 | ||
1470 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1471 | { | |
1472 | struct block_device *bdev = rdev->bdev; | |
1473 | rdev->bdev = NULL; | |
1474 | if (!bdev) | |
1475 | MD_BUG(); | |
1476 | bd_release(bdev); | |
2e7b651d | 1477 | blkdev_put(bdev); |
1da177e4 LT |
1478 | } |
1479 | ||
1480 | void md_autodetect_dev(dev_t dev); | |
1481 | ||
1482 | static void export_rdev(mdk_rdev_t * rdev) | |
1483 | { | |
1484 | char b[BDEVNAME_SIZE]; | |
1485 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1486 | bdevname(rdev->bdev,b)); | |
1487 | if (rdev->mddev) | |
1488 | MD_BUG(); | |
1489 | free_disk_sb(rdev); | |
1490 | list_del_init(&rdev->same_set); | |
1491 | #ifndef MODULE | |
1492 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1493 | #endif | |
1494 | unlock_rdev(rdev); | |
86e6ffdd | 1495 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1496 | } |
1497 | ||
1498 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1499 | { | |
1500 | unbind_rdev_from_array(rdev); | |
1501 | export_rdev(rdev); | |
1502 | } | |
1503 | ||
1504 | static void export_array(mddev_t *mddev) | |
1505 | { | |
1506 | struct list_head *tmp; | |
1507 | mdk_rdev_t *rdev; | |
1508 | ||
1509 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1510 | if (!rdev->mddev) { | |
1511 | MD_BUG(); | |
1512 | continue; | |
1513 | } | |
1514 | kick_rdev_from_array(rdev); | |
1515 | } | |
1516 | if (!list_empty(&mddev->disks)) | |
1517 | MD_BUG(); | |
1518 | mddev->raid_disks = 0; | |
1519 | mddev->major_version = 0; | |
1520 | } | |
1521 | ||
1522 | static void print_desc(mdp_disk_t *desc) | |
1523 | { | |
1524 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1525 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1526 | } | |
1527 | ||
1528 | static void print_sb(mdp_super_t *sb) | |
1529 | { | |
1530 | int i; | |
1531 | ||
1532 | printk(KERN_INFO | |
1533 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1534 | sb->major_version, sb->minor_version, sb->patch_version, | |
1535 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1536 | sb->ctime); | |
1537 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1538 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1539 | sb->md_minor, sb->layout, sb->chunk_size); | |
1540 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1541 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1542 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1543 | sb->failed_disks, sb->spare_disks, | |
1544 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1545 | ||
1546 | printk(KERN_INFO); | |
1547 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1548 | mdp_disk_t *desc; | |
1549 | ||
1550 | desc = sb->disks + i; | |
1551 | if (desc->number || desc->major || desc->minor || | |
1552 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1553 | printk(" D %2d: ", i); | |
1554 | print_desc(desc); | |
1555 | } | |
1556 | } | |
1557 | printk(KERN_INFO "md: THIS: "); | |
1558 | print_desc(&sb->this_disk); | |
1559 | ||
1560 | } | |
1561 | ||
1562 | static void print_rdev(mdk_rdev_t *rdev) | |
1563 | { | |
1564 | char b[BDEVNAME_SIZE]; | |
1565 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1566 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1567 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1568 | rdev->desc_nr); | |
1da177e4 LT |
1569 | if (rdev->sb_loaded) { |
1570 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1571 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1572 | } else | |
1573 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1574 | } | |
1575 | ||
5e56341d | 1576 | static void md_print_devices(void) |
1da177e4 LT |
1577 | { |
1578 | struct list_head *tmp, *tmp2; | |
1579 | mdk_rdev_t *rdev; | |
1580 | mddev_t *mddev; | |
1581 | char b[BDEVNAME_SIZE]; | |
1582 | ||
1583 | printk("\n"); | |
1584 | printk("md: **********************************\n"); | |
1585 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1586 | printk("md: **********************************\n"); | |
1587 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1588 | |
32a7627c N |
1589 | if (mddev->bitmap) |
1590 | bitmap_print_sb(mddev->bitmap); | |
1591 | else | |
1592 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1593 | ITERATE_RDEV(mddev,rdev,tmp2) |
1594 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1595 | printk("\n"); | |
1596 | ||
1597 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1598 | print_rdev(rdev); | |
1599 | } | |
1600 | printk("md: **********************************\n"); | |
1601 | printk("\n"); | |
1602 | } | |
1603 | ||
1604 | ||
42543769 | 1605 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1606 | { |
42543769 N |
1607 | /* Update each superblock (in-memory image), but |
1608 | * if we are allowed to, skip spares which already | |
1609 | * have the right event counter, or have one earlier | |
1610 | * (which would mean they aren't being marked as dirty | |
1611 | * with the rest of the array) | |
1612 | */ | |
1da177e4 LT |
1613 | mdk_rdev_t *rdev; |
1614 | struct list_head *tmp; | |
1615 | ||
1616 | ITERATE_RDEV(mddev,rdev,tmp) { | |
42543769 N |
1617 | if (rdev->sb_events == mddev->events || |
1618 | (nospares && | |
1619 | rdev->raid_disk < 0 && | |
1620 | (rdev->sb_events&1)==0 && | |
1621 | rdev->sb_events+1 == mddev->events)) { | |
1622 | /* Don't update this superblock */ | |
1623 | rdev->sb_loaded = 2; | |
1624 | } else { | |
1625 | super_types[mddev->major_version]. | |
1626 | sync_super(mddev, rdev); | |
1627 | rdev->sb_loaded = 1; | |
1628 | } | |
1da177e4 LT |
1629 | } |
1630 | } | |
1631 | ||
850b2b42 | 1632 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1633 | { |
1da177e4 LT |
1634 | struct list_head *tmp; |
1635 | mdk_rdev_t *rdev; | |
06d91a5f | 1636 | int sync_req; |
42543769 | 1637 | int nospares = 0; |
1da177e4 | 1638 | |
1da177e4 | 1639 | repeat: |
a9701a30 | 1640 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1641 | |
850b2b42 N |
1642 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1643 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1644 | force_change = 1; | |
1645 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1646 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1647 | * though if events isn't the right even/odd, we will have to do | |
1648 | * spares after all | |
1649 | */ | |
1650 | nospares = 1; | |
1651 | if (force_change) | |
1652 | nospares = 0; | |
1653 | if (mddev->degraded) | |
84692195 N |
1654 | /* If the array is degraded, then skipping spares is both |
1655 | * dangerous and fairly pointless. | |
1656 | * Dangerous because a device that was removed from the array | |
1657 | * might have a event_count that still looks up-to-date, | |
1658 | * so it can be re-added without a resync. | |
1659 | * Pointless because if there are any spares to skip, | |
1660 | * then a recovery will happen and soon that array won't | |
1661 | * be degraded any more and the spare can go back to sleep then. | |
1662 | */ | |
850b2b42 | 1663 | nospares = 0; |
84692195 | 1664 | |
06d91a5f | 1665 | sync_req = mddev->in_sync; |
1da177e4 | 1666 | mddev->utime = get_seconds(); |
42543769 N |
1667 | |
1668 | /* If this is just a dirty<->clean transition, and the array is clean | |
1669 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1670 | if (nospares |
42543769 | 1671 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1672 | && (mddev->events & 1) |
1673 | && mddev->events != 1) | |
42543769 N |
1674 | mddev->events--; |
1675 | else { | |
1676 | /* otherwise we have to go forward and ... */ | |
1677 | mddev->events ++; | |
1678 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1679 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1680 | if ((mddev->events&1)==0) { | |
1681 | mddev->events++; | |
1682 | nospares = 0; | |
1683 | } | |
1684 | } else { | |
1685 | /* otherwise insist on an even 'events' (for clean states) */ | |
1686 | if ((mddev->events&1)) { | |
1687 | mddev->events++; | |
1688 | nospares = 0; | |
1689 | } | |
1690 | } | |
1691 | } | |
1da177e4 LT |
1692 | |
1693 | if (!mddev->events) { | |
1694 | /* | |
1695 | * oops, this 64-bit counter should never wrap. | |
1696 | * Either we are in around ~1 trillion A.C., assuming | |
1697 | * 1 reboot per second, or we have a bug: | |
1698 | */ | |
1699 | MD_BUG(); | |
1700 | mddev->events --; | |
1701 | } | |
42543769 | 1702 | sync_sbs(mddev, nospares); |
1da177e4 LT |
1703 | |
1704 | /* | |
1705 | * do not write anything to disk if using | |
1706 | * nonpersistent superblocks | |
1707 | */ | |
06d91a5f | 1708 | if (!mddev->persistent) { |
850b2b42 | 1709 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1710 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1711 | wake_up(&mddev->sb_wait); |
1da177e4 | 1712 | return; |
06d91a5f | 1713 | } |
a9701a30 | 1714 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1715 | |
1716 | dprintk(KERN_INFO | |
1717 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1718 | mdname(mddev),mddev->in_sync); | |
1719 | ||
4ad13663 | 1720 | bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1721 | ITERATE_RDEV(mddev,rdev,tmp) { |
1722 | char b[BDEVNAME_SIZE]; | |
1723 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1724 | if (rdev->sb_loaded != 1) |
1725 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1726 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1727 | dprintk("(skipping faulty "); |
1728 | ||
1729 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1730 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1731 | md_super_write(mddev,rdev, |
0002b271 | 1732 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1733 | rdev->sb_page); |
1734 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1735 | bdevname(rdev->bdev,b), | |
1736 | (unsigned long long)rdev->sb_offset); | |
42543769 | 1737 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1738 | |
1da177e4 LT |
1739 | } else |
1740 | dprintk(")\n"); | |
7bfa19f2 | 1741 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1742 | /* only need to write one superblock... */ |
1743 | break; | |
1744 | } | |
a9701a30 | 1745 | md_super_wait(mddev); |
850b2b42 | 1746 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1747 | |
a9701a30 | 1748 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1749 | if (mddev->in_sync != sync_req || |
1750 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1751 | /* have to write it out again */ |
a9701a30 | 1752 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1753 | goto repeat; |
1754 | } | |
850b2b42 | 1755 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1756 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1757 | wake_up(&mddev->sb_wait); |
06d91a5f | 1758 | |
1da177e4 LT |
1759 | } |
1760 | ||
bce74dac N |
1761 | /* words written to sysfs files may, or my not, be \n terminated. |
1762 | * We want to accept with case. For this we use cmd_match. | |
1763 | */ | |
1764 | static int cmd_match(const char *cmd, const char *str) | |
1765 | { | |
1766 | /* See if cmd, written into a sysfs file, matches | |
1767 | * str. They must either be the same, or cmd can | |
1768 | * have a trailing newline | |
1769 | */ | |
1770 | while (*cmd && *str && *cmd == *str) { | |
1771 | cmd++; | |
1772 | str++; | |
1773 | } | |
1774 | if (*cmd == '\n') | |
1775 | cmd++; | |
1776 | if (*str || *cmd) | |
1777 | return 0; | |
1778 | return 1; | |
1779 | } | |
1780 | ||
86e6ffdd N |
1781 | struct rdev_sysfs_entry { |
1782 | struct attribute attr; | |
1783 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1784 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1785 | }; | |
1786 | ||
1787 | static ssize_t | |
96de1e66 | 1788 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1789 | { |
1790 | char *sep = ""; | |
1791 | int len=0; | |
1792 | ||
b2d444d7 | 1793 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1794 | len+= sprintf(page+len, "%sfaulty",sep); |
1795 | sep = ","; | |
1796 | } | |
b2d444d7 | 1797 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1798 | len += sprintf(page+len, "%sin_sync",sep); |
1799 | sep = ","; | |
1800 | } | |
f655675b N |
1801 | if (test_bit(WriteMostly, &rdev->flags)) { |
1802 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1803 | sep = ","; | |
1804 | } | |
b2d444d7 N |
1805 | if (!test_bit(Faulty, &rdev->flags) && |
1806 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1807 | len += sprintf(page+len, "%sspare", sep); |
1808 | sep = ","; | |
1809 | } | |
1810 | return len+sprintf(page+len, "\n"); | |
1811 | } | |
1812 | ||
45dc2de1 N |
1813 | static ssize_t |
1814 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1815 | { | |
1816 | /* can write | |
1817 | * faulty - simulates and error | |
1818 | * remove - disconnects the device | |
f655675b N |
1819 | * writemostly - sets write_mostly |
1820 | * -writemostly - clears write_mostly | |
45dc2de1 N |
1821 | */ |
1822 | int err = -EINVAL; | |
1823 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1824 | md_error(rdev->mddev, rdev); | |
1825 | err = 0; | |
1826 | } else if (cmd_match(buf, "remove")) { | |
1827 | if (rdev->raid_disk >= 0) | |
1828 | err = -EBUSY; | |
1829 | else { | |
1830 | mddev_t *mddev = rdev->mddev; | |
1831 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1832 | if (mddev->pers) |
1833 | md_update_sb(mddev, 1); | |
45dc2de1 N |
1834 | md_new_event(mddev); |
1835 | err = 0; | |
1836 | } | |
f655675b N |
1837 | } else if (cmd_match(buf, "writemostly")) { |
1838 | set_bit(WriteMostly, &rdev->flags); | |
1839 | err = 0; | |
1840 | } else if (cmd_match(buf, "-writemostly")) { | |
1841 | clear_bit(WriteMostly, &rdev->flags); | |
1842 | err = 0; | |
45dc2de1 N |
1843 | } |
1844 | return err ? err : len; | |
1845 | } | |
80ca3a44 N |
1846 | static struct rdev_sysfs_entry rdev_state = |
1847 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd N |
1848 | |
1849 | static ssize_t | |
96de1e66 | 1850 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1851 | { |
1852 | if (rdev->sb_loaded && rdev->sb_size) { | |
1853 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1854 | return rdev->sb_size; | |
1855 | } else | |
1856 | return 0; | |
1857 | } | |
96de1e66 N |
1858 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1859 | ||
4dbcdc75 N |
1860 | static ssize_t |
1861 | errors_show(mdk_rdev_t *rdev, char *page) | |
1862 | { | |
1863 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1864 | } | |
1865 | ||
1866 | static ssize_t | |
1867 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1868 | { | |
1869 | char *e; | |
1870 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1871 | if (*buf && (*e == 0 || *e == '\n')) { | |
1872 | atomic_set(&rdev->corrected_errors, n); | |
1873 | return len; | |
1874 | } | |
1875 | return -EINVAL; | |
1876 | } | |
1877 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 1878 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 1879 | |
014236d2 N |
1880 | static ssize_t |
1881 | slot_show(mdk_rdev_t *rdev, char *page) | |
1882 | { | |
1883 | if (rdev->raid_disk < 0) | |
1884 | return sprintf(page, "none\n"); | |
1885 | else | |
1886 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1887 | } | |
1888 | ||
1889 | static ssize_t | |
1890 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1891 | { | |
1892 | char *e; | |
1893 | int slot = simple_strtoul(buf, &e, 10); | |
1894 | if (strncmp(buf, "none", 4)==0) | |
1895 | slot = -1; | |
1896 | else if (e==buf || (*e && *e!= '\n')) | |
1897 | return -EINVAL; | |
1898 | if (rdev->mddev->pers) | |
1899 | /* Cannot set slot in active array (yet) */ | |
1900 | return -EBUSY; | |
1901 | if (slot >= rdev->mddev->raid_disks) | |
1902 | return -ENOSPC; | |
1903 | rdev->raid_disk = slot; | |
1904 | /* assume it is working */ | |
1905 | rdev->flags = 0; | |
1906 | set_bit(In_sync, &rdev->flags); | |
1907 | return len; | |
1908 | } | |
1909 | ||
1910 | ||
1911 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 1912 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 1913 | |
93c8cad0 N |
1914 | static ssize_t |
1915 | offset_show(mdk_rdev_t *rdev, char *page) | |
1916 | { | |
6961ece4 | 1917 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
1918 | } |
1919 | ||
1920 | static ssize_t | |
1921 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1922 | { | |
1923 | char *e; | |
1924 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
1925 | if (e==buf || (*e && *e != '\n')) | |
1926 | return -EINVAL; | |
1927 | if (rdev->mddev->pers) | |
1928 | return -EBUSY; | |
1929 | rdev->data_offset = offset; | |
1930 | return len; | |
1931 | } | |
1932 | ||
1933 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 1934 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 1935 | |
83303b61 N |
1936 | static ssize_t |
1937 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
1938 | { | |
1939 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
1940 | } | |
1941 | ||
1942 | static ssize_t | |
1943 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1944 | { | |
1945 | char *e; | |
1946 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
1947 | if (e==buf || (*e && *e != '\n')) | |
1948 | return -EINVAL; | |
1949 | if (rdev->mddev->pers) | |
1950 | return -EBUSY; | |
1951 | rdev->size = size; | |
1952 | if (size < rdev->mddev->size || rdev->mddev->size == 0) | |
1953 | rdev->mddev->size = size; | |
1954 | return len; | |
1955 | } | |
1956 | ||
1957 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 1958 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 1959 | |
86e6ffdd N |
1960 | static struct attribute *rdev_default_attrs[] = { |
1961 | &rdev_state.attr, | |
1962 | &rdev_super.attr, | |
4dbcdc75 | 1963 | &rdev_errors.attr, |
014236d2 | 1964 | &rdev_slot.attr, |
93c8cad0 | 1965 | &rdev_offset.attr, |
83303b61 | 1966 | &rdev_size.attr, |
86e6ffdd N |
1967 | NULL, |
1968 | }; | |
1969 | static ssize_t | |
1970 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1971 | { | |
1972 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1973 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1974 | ||
1975 | if (!entry->show) | |
1976 | return -EIO; | |
1977 | return entry->show(rdev, page); | |
1978 | } | |
1979 | ||
1980 | static ssize_t | |
1981 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1982 | const char *page, size_t length) | |
1983 | { | |
1984 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1985 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1986 | ||
1987 | if (!entry->store) | |
1988 | return -EIO; | |
67463acb N |
1989 | if (!capable(CAP_SYS_ADMIN)) |
1990 | return -EACCES; | |
86e6ffdd N |
1991 | return entry->store(rdev, page, length); |
1992 | } | |
1993 | ||
1994 | static void rdev_free(struct kobject *ko) | |
1995 | { | |
1996 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
1997 | kfree(rdev); | |
1998 | } | |
1999 | static struct sysfs_ops rdev_sysfs_ops = { | |
2000 | .show = rdev_attr_show, | |
2001 | .store = rdev_attr_store, | |
2002 | }; | |
2003 | static struct kobj_type rdev_ktype = { | |
2004 | .release = rdev_free, | |
2005 | .sysfs_ops = &rdev_sysfs_ops, | |
2006 | .default_attrs = rdev_default_attrs, | |
2007 | }; | |
2008 | ||
1da177e4 LT |
2009 | /* |
2010 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2011 | * | |
2012 | * mark the device faulty if: | |
2013 | * | |
2014 | * - the device is nonexistent (zero size) | |
2015 | * - the device has no valid superblock | |
2016 | * | |
2017 | * a faulty rdev _never_ has rdev->sb set. | |
2018 | */ | |
2019 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2020 | { | |
2021 | char b[BDEVNAME_SIZE]; | |
2022 | int err; | |
2023 | mdk_rdev_t *rdev; | |
2024 | sector_t size; | |
2025 | ||
9ffae0cf | 2026 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2027 | if (!rdev) { |
2028 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2029 | return ERR_PTR(-ENOMEM); | |
2030 | } | |
1da177e4 LT |
2031 | |
2032 | if ((err = alloc_disk_sb(rdev))) | |
2033 | goto abort_free; | |
2034 | ||
2035 | err = lock_rdev(rdev, newdev); | |
2036 | if (err) | |
2037 | goto abort_free; | |
2038 | ||
86e6ffdd N |
2039 | rdev->kobj.parent = NULL; |
2040 | rdev->kobj.ktype = &rdev_ktype; | |
2041 | kobject_init(&rdev->kobj); | |
2042 | ||
1da177e4 | 2043 | rdev->desc_nr = -1; |
2b6e8459 | 2044 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2045 | rdev->raid_disk = -1; |
b2d444d7 | 2046 | rdev->flags = 0; |
1da177e4 | 2047 | rdev->data_offset = 0; |
42543769 | 2048 | rdev->sb_events = 0; |
1da177e4 | 2049 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2050 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2051 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2052 | |
2053 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2054 | if (!size) { | |
2055 | printk(KERN_WARNING | |
2056 | "md: %s has zero or unknown size, marking faulty!\n", | |
2057 | bdevname(rdev->bdev,b)); | |
2058 | err = -EINVAL; | |
2059 | goto abort_free; | |
2060 | } | |
2061 | ||
2062 | if (super_format >= 0) { | |
2063 | err = super_types[super_format]. | |
2064 | load_super(rdev, NULL, super_minor); | |
2065 | if (err == -EINVAL) { | |
df968c4e N |
2066 | printk(KERN_WARNING |
2067 | "md: %s does not have a valid v%d.%d " | |
2068 | "superblock, not importing!\n", | |
2069 | bdevname(rdev->bdev,b), | |
2070 | super_format, super_minor); | |
1da177e4 LT |
2071 | goto abort_free; |
2072 | } | |
2073 | if (err < 0) { | |
2074 | printk(KERN_WARNING | |
2075 | "md: could not read %s's sb, not importing!\n", | |
2076 | bdevname(rdev->bdev,b)); | |
2077 | goto abort_free; | |
2078 | } | |
2079 | } | |
2080 | INIT_LIST_HEAD(&rdev->same_set); | |
2081 | ||
2082 | return rdev; | |
2083 | ||
2084 | abort_free: | |
2085 | if (rdev->sb_page) { | |
2086 | if (rdev->bdev) | |
2087 | unlock_rdev(rdev); | |
2088 | free_disk_sb(rdev); | |
2089 | } | |
2090 | kfree(rdev); | |
2091 | return ERR_PTR(err); | |
2092 | } | |
2093 | ||
2094 | /* | |
2095 | * Check a full RAID array for plausibility | |
2096 | */ | |
2097 | ||
2098 | ||
a757e64c | 2099 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2100 | { |
2101 | int i; | |
2102 | struct list_head *tmp; | |
2103 | mdk_rdev_t *rdev, *freshest; | |
2104 | char b[BDEVNAME_SIZE]; | |
2105 | ||
2106 | freshest = NULL; | |
2107 | ITERATE_RDEV(mddev,rdev,tmp) | |
2108 | switch (super_types[mddev->major_version]. | |
2109 | load_super(rdev, freshest, mddev->minor_version)) { | |
2110 | case 1: | |
2111 | freshest = rdev; | |
2112 | break; | |
2113 | case 0: | |
2114 | break; | |
2115 | default: | |
2116 | printk( KERN_ERR \ | |
2117 | "md: fatal superblock inconsistency in %s" | |
2118 | " -- removing from array\n", | |
2119 | bdevname(rdev->bdev,b)); | |
2120 | kick_rdev_from_array(rdev); | |
2121 | } | |
2122 | ||
2123 | ||
2124 | super_types[mddev->major_version]. | |
2125 | validate_super(mddev, freshest); | |
2126 | ||
2127 | i = 0; | |
2128 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2129 | if (rdev != freshest) | |
2130 | if (super_types[mddev->major_version]. | |
2131 | validate_super(mddev, rdev)) { | |
2132 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2133 | " from array!\n", | |
2134 | bdevname(rdev->bdev,b)); | |
2135 | kick_rdev_from_array(rdev); | |
2136 | continue; | |
2137 | } | |
2138 | if (mddev->level == LEVEL_MULTIPATH) { | |
2139 | rdev->desc_nr = i++; | |
2140 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2141 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2142 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2143 | rdev->raid_disk = -1; | |
2144 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2145 | } |
2146 | } | |
2147 | ||
2148 | ||
2149 | ||
2150 | if (mddev->recovery_cp != MaxSector && | |
2151 | mddev->level >= 1) | |
2152 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2153 | " -- starting background reconstruction\n", | |
2154 | mdname(mddev)); | |
2155 | ||
1da177e4 LT |
2156 | } |
2157 | ||
16f17b39 N |
2158 | static ssize_t |
2159 | safe_delay_show(mddev_t *mddev, char *page) | |
2160 | { | |
2161 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2162 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2163 | } | |
2164 | static ssize_t | |
2165 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2166 | { | |
2167 | int scale=1; | |
2168 | int dot=0; | |
2169 | int i; | |
2170 | unsigned long msec; | |
2171 | char buf[30]; | |
2172 | char *e; | |
2173 | /* remove a period, and count digits after it */ | |
2174 | if (len >= sizeof(buf)) | |
2175 | return -EINVAL; | |
2176 | strlcpy(buf, cbuf, len); | |
2177 | buf[len] = 0; | |
2178 | for (i=0; i<len; i++) { | |
2179 | if (dot) { | |
2180 | if (isdigit(buf[i])) { | |
2181 | buf[i-1] = buf[i]; | |
2182 | scale *= 10; | |
2183 | } | |
2184 | buf[i] = 0; | |
2185 | } else if (buf[i] == '.') { | |
2186 | dot=1; | |
2187 | buf[i] = 0; | |
2188 | } | |
2189 | } | |
2190 | msec = simple_strtoul(buf, &e, 10); | |
2191 | if (e == buf || (*e && *e != '\n')) | |
2192 | return -EINVAL; | |
2193 | msec = (msec * 1000) / scale; | |
2194 | if (msec == 0) | |
2195 | mddev->safemode_delay = 0; | |
2196 | else { | |
2197 | mddev->safemode_delay = (msec*HZ)/1000; | |
2198 | if (mddev->safemode_delay == 0) | |
2199 | mddev->safemode_delay = 1; | |
2200 | } | |
2201 | return len; | |
2202 | } | |
2203 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2204 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2205 | |
eae1701f | 2206 | static ssize_t |
96de1e66 | 2207 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2208 | { |
2604b703 | 2209 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2210 | if (p) |
eae1701f | 2211 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2212 | else if (mddev->clevel[0]) |
2213 | return sprintf(page, "%s\n", mddev->clevel); | |
2214 | else if (mddev->level != LEVEL_NONE) | |
2215 | return sprintf(page, "%d\n", mddev->level); | |
2216 | else | |
2217 | return 0; | |
eae1701f N |
2218 | } |
2219 | ||
d9d166c2 N |
2220 | static ssize_t |
2221 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2222 | { | |
2223 | int rv = len; | |
2224 | if (mddev->pers) | |
2225 | return -EBUSY; | |
2226 | if (len == 0) | |
2227 | return 0; | |
2228 | if (len >= sizeof(mddev->clevel)) | |
2229 | return -ENOSPC; | |
2230 | strncpy(mddev->clevel, buf, len); | |
2231 | if (mddev->clevel[len-1] == '\n') | |
2232 | len--; | |
2233 | mddev->clevel[len] = 0; | |
2234 | mddev->level = LEVEL_NONE; | |
2235 | return rv; | |
2236 | } | |
2237 | ||
2238 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2239 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2240 | |
d4dbd025 N |
2241 | |
2242 | static ssize_t | |
2243 | layout_show(mddev_t *mddev, char *page) | |
2244 | { | |
2245 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2246 | if (mddev->reshape_position != MaxSector && |
2247 | mddev->layout != mddev->new_layout) | |
2248 | return sprintf(page, "%d (%d)\n", | |
2249 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2250 | return sprintf(page, "%d\n", mddev->layout); |
2251 | } | |
2252 | ||
2253 | static ssize_t | |
2254 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2255 | { | |
2256 | char *e; | |
2257 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2258 | |
2259 | if (!*buf || (*e && *e != '\n')) | |
2260 | return -EINVAL; | |
2261 | ||
08a02ecd N |
2262 | if (mddev->pers) |
2263 | return -EBUSY; | |
2264 | if (mddev->reshape_position != MaxSector) | |
2265 | mddev->new_layout = n; | |
2266 | else | |
2267 | mddev->layout = n; | |
d4dbd025 N |
2268 | return len; |
2269 | } | |
2270 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2271 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2272 | |
2273 | ||
eae1701f | 2274 | static ssize_t |
96de1e66 | 2275 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2276 | { |
bb636547 N |
2277 | if (mddev->raid_disks == 0) |
2278 | return 0; | |
08a02ecd N |
2279 | if (mddev->reshape_position != MaxSector && |
2280 | mddev->delta_disks != 0) | |
2281 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2282 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2283 | return sprintf(page, "%d\n", mddev->raid_disks); |
2284 | } | |
2285 | ||
da943b99 N |
2286 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2287 | ||
2288 | static ssize_t | |
2289 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2290 | { | |
da943b99 N |
2291 | char *e; |
2292 | int rv = 0; | |
2293 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2294 | ||
2295 | if (!*buf || (*e && *e != '\n')) | |
2296 | return -EINVAL; | |
2297 | ||
2298 | if (mddev->pers) | |
2299 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2300 | else if (mddev->reshape_position != MaxSector) { |
2301 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2302 | mddev->delta_disks = n - olddisks; | |
2303 | mddev->raid_disks = n; | |
2304 | } else | |
da943b99 N |
2305 | mddev->raid_disks = n; |
2306 | return rv ? rv : len; | |
2307 | } | |
2308 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2309 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2310 | |
3b34380a N |
2311 | static ssize_t |
2312 | chunk_size_show(mddev_t *mddev, char *page) | |
2313 | { | |
08a02ecd N |
2314 | if (mddev->reshape_position != MaxSector && |
2315 | mddev->chunk_size != mddev->new_chunk) | |
2316 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2317 | mddev->chunk_size); | |
3b34380a N |
2318 | return sprintf(page, "%d\n", mddev->chunk_size); |
2319 | } | |
2320 | ||
2321 | static ssize_t | |
2322 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2323 | { | |
2324 | /* can only set chunk_size if array is not yet active */ | |
2325 | char *e; | |
2326 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2327 | ||
3b34380a N |
2328 | if (!*buf || (*e && *e != '\n')) |
2329 | return -EINVAL; | |
2330 | ||
08a02ecd N |
2331 | if (mddev->pers) |
2332 | return -EBUSY; | |
2333 | else if (mddev->reshape_position != MaxSector) | |
2334 | mddev->new_chunk = n; | |
2335 | else | |
2336 | mddev->chunk_size = n; | |
3b34380a N |
2337 | return len; |
2338 | } | |
2339 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2340 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2341 | |
a94213b1 N |
2342 | static ssize_t |
2343 | resync_start_show(mddev_t *mddev, char *page) | |
2344 | { | |
2345 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2346 | } | |
2347 | ||
2348 | static ssize_t | |
2349 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2350 | { | |
2351 | /* can only set chunk_size if array is not yet active */ | |
2352 | char *e; | |
2353 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2354 | ||
2355 | if (mddev->pers) | |
2356 | return -EBUSY; | |
2357 | if (!*buf || (*e && *e != '\n')) | |
2358 | return -EINVAL; | |
2359 | ||
2360 | mddev->recovery_cp = n; | |
2361 | return len; | |
2362 | } | |
2363 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2364 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2365 | |
9e653b63 N |
2366 | /* |
2367 | * The array state can be: | |
2368 | * | |
2369 | * clear | |
2370 | * No devices, no size, no level | |
2371 | * Equivalent to STOP_ARRAY ioctl | |
2372 | * inactive | |
2373 | * May have some settings, but array is not active | |
2374 | * all IO results in error | |
2375 | * When written, doesn't tear down array, but just stops it | |
2376 | * suspended (not supported yet) | |
2377 | * All IO requests will block. The array can be reconfigured. | |
2378 | * Writing this, if accepted, will block until array is quiessent | |
2379 | * readonly | |
2380 | * no resync can happen. no superblocks get written. | |
2381 | * write requests fail | |
2382 | * read-auto | |
2383 | * like readonly, but behaves like 'clean' on a write request. | |
2384 | * | |
2385 | * clean - no pending writes, but otherwise active. | |
2386 | * When written to inactive array, starts without resync | |
2387 | * If a write request arrives then | |
2388 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2389 | * if not known, block and switch to write-pending | |
2390 | * If written to an active array that has pending writes, then fails. | |
2391 | * active | |
2392 | * fully active: IO and resync can be happening. | |
2393 | * When written to inactive array, starts with resync | |
2394 | * | |
2395 | * write-pending | |
2396 | * clean, but writes are blocked waiting for 'active' to be written. | |
2397 | * | |
2398 | * active-idle | |
2399 | * like active, but no writes have been seen for a while (100msec). | |
2400 | * | |
2401 | */ | |
2402 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2403 | write_pending, active_idle, bad_word}; | |
05381954 | 2404 | static char *array_states[] = { |
9e653b63 N |
2405 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2406 | "write-pending", "active-idle", NULL }; | |
2407 | ||
2408 | static int match_word(const char *word, char **list) | |
2409 | { | |
2410 | int n; | |
2411 | for (n=0; list[n]; n++) | |
2412 | if (cmd_match(word, list[n])) | |
2413 | break; | |
2414 | return n; | |
2415 | } | |
2416 | ||
2417 | static ssize_t | |
2418 | array_state_show(mddev_t *mddev, char *page) | |
2419 | { | |
2420 | enum array_state st = inactive; | |
2421 | ||
2422 | if (mddev->pers) | |
2423 | switch(mddev->ro) { | |
2424 | case 1: | |
2425 | st = readonly; | |
2426 | break; | |
2427 | case 2: | |
2428 | st = read_auto; | |
2429 | break; | |
2430 | case 0: | |
2431 | if (mddev->in_sync) | |
2432 | st = clean; | |
2433 | else if (mddev->safemode) | |
2434 | st = active_idle; | |
2435 | else | |
2436 | st = active; | |
2437 | } | |
2438 | else { | |
2439 | if (list_empty(&mddev->disks) && | |
2440 | mddev->raid_disks == 0 && | |
2441 | mddev->size == 0) | |
2442 | st = clear; | |
2443 | else | |
2444 | st = inactive; | |
2445 | } | |
2446 | return sprintf(page, "%s\n", array_states[st]); | |
2447 | } | |
2448 | ||
2449 | static int do_md_stop(mddev_t * mddev, int ro); | |
2450 | static int do_md_run(mddev_t * mddev); | |
2451 | static int restart_array(mddev_t *mddev); | |
2452 | ||
2453 | static ssize_t | |
2454 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2455 | { | |
2456 | int err = -EINVAL; | |
2457 | enum array_state st = match_word(buf, array_states); | |
2458 | switch(st) { | |
2459 | case bad_word: | |
2460 | break; | |
2461 | case clear: | |
2462 | /* stopping an active array */ | |
2463 | if (mddev->pers) { | |
2464 | if (atomic_read(&mddev->active) > 1) | |
2465 | return -EBUSY; | |
2466 | err = do_md_stop(mddev, 0); | |
2467 | } | |
2468 | break; | |
2469 | case inactive: | |
2470 | /* stopping an active array */ | |
2471 | if (mddev->pers) { | |
2472 | if (atomic_read(&mddev->active) > 1) | |
2473 | return -EBUSY; | |
2474 | err = do_md_stop(mddev, 2); | |
2475 | } | |
2476 | break; | |
2477 | case suspended: | |
2478 | break; /* not supported yet */ | |
2479 | case readonly: | |
2480 | if (mddev->pers) | |
2481 | err = do_md_stop(mddev, 1); | |
2482 | else { | |
2483 | mddev->ro = 1; | |
2484 | err = do_md_run(mddev); | |
2485 | } | |
2486 | break; | |
2487 | case read_auto: | |
2488 | /* stopping an active array */ | |
2489 | if (mddev->pers) { | |
2490 | err = do_md_stop(mddev, 1); | |
2491 | if (err == 0) | |
2492 | mddev->ro = 2; /* FIXME mark devices writable */ | |
2493 | } else { | |
2494 | mddev->ro = 2; | |
2495 | err = do_md_run(mddev); | |
2496 | } | |
2497 | break; | |
2498 | case clean: | |
2499 | if (mddev->pers) { | |
2500 | restart_array(mddev); | |
2501 | spin_lock_irq(&mddev->write_lock); | |
2502 | if (atomic_read(&mddev->writes_pending) == 0) { | |
2503 | mddev->in_sync = 1; | |
850b2b42 | 2504 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
9e653b63 N |
2505 | } |
2506 | spin_unlock_irq(&mddev->write_lock); | |
2507 | } else { | |
2508 | mddev->ro = 0; | |
2509 | mddev->recovery_cp = MaxSector; | |
2510 | err = do_md_run(mddev); | |
2511 | } | |
2512 | break; | |
2513 | case active: | |
2514 | if (mddev->pers) { | |
2515 | restart_array(mddev); | |
850b2b42 | 2516 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
9e653b63 N |
2517 | wake_up(&mddev->sb_wait); |
2518 | err = 0; | |
2519 | } else { | |
2520 | mddev->ro = 0; | |
2521 | err = do_md_run(mddev); | |
2522 | } | |
2523 | break; | |
2524 | case write_pending: | |
2525 | case active_idle: | |
2526 | /* these cannot be set */ | |
2527 | break; | |
2528 | } | |
2529 | if (err) | |
2530 | return err; | |
2531 | else | |
2532 | return len; | |
2533 | } | |
80ca3a44 N |
2534 | static struct md_sysfs_entry md_array_state = |
2535 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2536 | |
6d7ff738 N |
2537 | static ssize_t |
2538 | null_show(mddev_t *mddev, char *page) | |
2539 | { | |
2540 | return -EINVAL; | |
2541 | } | |
2542 | ||
2543 | static ssize_t | |
2544 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2545 | { | |
2546 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2547 | /* The new device is added to the array. | |
2548 | * If the array has a persistent superblock, we read the | |
2549 | * superblock to initialise info and check validity. | |
2550 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2551 | * which mainly checks size. | |
2552 | */ | |
2553 | char *e; | |
2554 | int major = simple_strtoul(buf, &e, 10); | |
2555 | int minor; | |
2556 | dev_t dev; | |
2557 | mdk_rdev_t *rdev; | |
2558 | int err; | |
2559 | ||
2560 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2561 | return -EINVAL; | |
2562 | minor = simple_strtoul(e+1, &e, 10); | |
2563 | if (*e && *e != '\n') | |
2564 | return -EINVAL; | |
2565 | dev = MKDEV(major, minor); | |
2566 | if (major != MAJOR(dev) || | |
2567 | minor != MINOR(dev)) | |
2568 | return -EOVERFLOW; | |
2569 | ||
2570 | ||
2571 | if (mddev->persistent) { | |
2572 | rdev = md_import_device(dev, mddev->major_version, | |
2573 | mddev->minor_version); | |
2574 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2575 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2576 | mdk_rdev_t, same_set); | |
2577 | err = super_types[mddev->major_version] | |
2578 | .load_super(rdev, rdev0, mddev->minor_version); | |
2579 | if (err < 0) | |
2580 | goto out; | |
2581 | } | |
2582 | } else | |
2583 | rdev = md_import_device(dev, -1, -1); | |
2584 | ||
2585 | if (IS_ERR(rdev)) | |
2586 | return PTR_ERR(rdev); | |
2587 | err = bind_rdev_to_array(rdev, mddev); | |
2588 | out: | |
2589 | if (err) | |
2590 | export_rdev(rdev); | |
2591 | return err ? err : len; | |
2592 | } | |
2593 | ||
2594 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2595 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2596 | |
9b1d1dac PC |
2597 | static ssize_t |
2598 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2599 | { | |
2600 | char *end; | |
2601 | unsigned long chunk, end_chunk; | |
2602 | ||
2603 | if (!mddev->bitmap) | |
2604 | goto out; | |
2605 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2606 | while (*buf) { | |
2607 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2608 | if (buf == end) break; | |
2609 | if (*end == '-') { /* range */ | |
2610 | buf = end + 1; | |
2611 | end_chunk = simple_strtoul(buf, &end, 0); | |
2612 | if (buf == end) break; | |
2613 | } | |
2614 | if (*end && !isspace(*end)) break; | |
2615 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2616 | buf = end; | |
2617 | while (isspace(*buf)) buf++; | |
2618 | } | |
2619 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2620 | out: | |
2621 | return len; | |
2622 | } | |
2623 | ||
2624 | static struct md_sysfs_entry md_bitmap = | |
2625 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2626 | ||
a35b0d69 N |
2627 | static ssize_t |
2628 | size_show(mddev_t *mddev, char *page) | |
2629 | { | |
2630 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2631 | } | |
2632 | ||
2633 | static int update_size(mddev_t *mddev, unsigned long size); | |
2634 | ||
2635 | static ssize_t | |
2636 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2637 | { | |
2638 | /* If array is inactive, we can reduce the component size, but | |
2639 | * not increase it (except from 0). | |
2640 | * If array is active, we can try an on-line resize | |
2641 | */ | |
2642 | char *e; | |
2643 | int err = 0; | |
2644 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2645 | if (!*buf || *buf == '\n' || | |
2646 | (*e && *e != '\n')) | |
2647 | return -EINVAL; | |
2648 | ||
2649 | if (mddev->pers) { | |
2650 | err = update_size(mddev, size); | |
850b2b42 | 2651 | md_update_sb(mddev, 1); |
a35b0d69 N |
2652 | } else { |
2653 | if (mddev->size == 0 || | |
2654 | mddev->size > size) | |
2655 | mddev->size = size; | |
2656 | else | |
2657 | err = -ENOSPC; | |
2658 | } | |
2659 | return err ? err : len; | |
2660 | } | |
2661 | ||
2662 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 2663 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 2664 | |
8bb93aac N |
2665 | |
2666 | /* Metdata version. | |
2667 | * This is either 'none' for arrays with externally managed metadata, | |
2668 | * or N.M for internally known formats | |
2669 | */ | |
2670 | static ssize_t | |
2671 | metadata_show(mddev_t *mddev, char *page) | |
2672 | { | |
2673 | if (mddev->persistent) | |
2674 | return sprintf(page, "%d.%d\n", | |
2675 | mddev->major_version, mddev->minor_version); | |
2676 | else | |
2677 | return sprintf(page, "none\n"); | |
2678 | } | |
2679 | ||
2680 | static ssize_t | |
2681 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2682 | { | |
2683 | int major, minor; | |
2684 | char *e; | |
2685 | if (!list_empty(&mddev->disks)) | |
2686 | return -EBUSY; | |
2687 | ||
2688 | if (cmd_match(buf, "none")) { | |
2689 | mddev->persistent = 0; | |
2690 | mddev->major_version = 0; | |
2691 | mddev->minor_version = 90; | |
2692 | return len; | |
2693 | } | |
2694 | major = simple_strtoul(buf, &e, 10); | |
2695 | if (e==buf || *e != '.') | |
2696 | return -EINVAL; | |
2697 | buf = e+1; | |
2698 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 2699 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 2700 | return -EINVAL; |
50511da3 | 2701 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
2702 | return -ENOENT; |
2703 | mddev->major_version = major; | |
2704 | mddev->minor_version = minor; | |
2705 | mddev->persistent = 1; | |
2706 | return len; | |
2707 | } | |
2708 | ||
2709 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 2710 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 2711 | |
24dd469d | 2712 | static ssize_t |
7eec314d | 2713 | action_show(mddev_t *mddev, char *page) |
24dd469d | 2714 | { |
7eec314d | 2715 | char *type = "idle"; |
31399d9e | 2716 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 2717 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
2718 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
2719 | type = "reshape"; | |
2720 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2721 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2722 | type = "resync"; | |
2723 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2724 | type = "check"; | |
2725 | else | |
2726 | type = "repair"; | |
2727 | } else | |
2728 | type = "recover"; | |
2729 | } | |
2730 | return sprintf(page, "%s\n", type); | |
2731 | } | |
2732 | ||
2733 | static ssize_t | |
7eec314d | 2734 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 2735 | { |
7eec314d N |
2736 | if (!mddev->pers || !mddev->pers->sync_request) |
2737 | return -EINVAL; | |
2738 | ||
bce74dac | 2739 | if (cmd_match(page, "idle")) { |
7eec314d N |
2740 | if (mddev->sync_thread) { |
2741 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2742 | md_unregister_thread(mddev->sync_thread); | |
2743 | mddev->sync_thread = NULL; | |
2744 | mddev->recovery = 0; | |
2745 | } | |
03c902e1 N |
2746 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2747 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 2748 | return -EBUSY; |
03c902e1 | 2749 | else if (cmd_match(page, "resync") || cmd_match(page, "recover")) |
7eec314d | 2750 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
16484bf5 N |
2751 | else if (cmd_match(page, "reshape")) { |
2752 | int err; | |
2753 | if (mddev->pers->start_reshape == NULL) | |
2754 | return -EINVAL; | |
2755 | err = mddev->pers->start_reshape(mddev); | |
2756 | if (err) | |
2757 | return err; | |
2758 | } else { | |
bce74dac | 2759 | if (cmd_match(page, "check")) |
7eec314d | 2760 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 2761 | else if (!cmd_match(page, "repair")) |
7eec314d N |
2762 | return -EINVAL; |
2763 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
2764 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 2765 | } |
03c902e1 | 2766 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d N |
2767 | md_wakeup_thread(mddev->thread); |
2768 | return len; | |
2769 | } | |
2770 | ||
9d88883e | 2771 | static ssize_t |
96de1e66 | 2772 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
2773 | { |
2774 | return sprintf(page, "%llu\n", | |
2775 | (unsigned long long) mddev->resync_mismatches); | |
2776 | } | |
2777 | ||
80ca3a44 N |
2778 | static struct md_sysfs_entry md_scan_mode = |
2779 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 2780 | |
96de1e66 | 2781 | |
80ca3a44 | 2782 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 2783 | |
88202a0c N |
2784 | static ssize_t |
2785 | sync_min_show(mddev_t *mddev, char *page) | |
2786 | { | |
2787 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
2788 | mddev->sync_speed_min ? "local": "system"); | |
2789 | } | |
2790 | ||
2791 | static ssize_t | |
2792 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
2793 | { | |
2794 | int min; | |
2795 | char *e; | |
2796 | if (strncmp(buf, "system", 6)==0) { | |
2797 | mddev->sync_speed_min = 0; | |
2798 | return len; | |
2799 | } | |
2800 | min = simple_strtoul(buf, &e, 10); | |
2801 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
2802 | return -EINVAL; | |
2803 | mddev->sync_speed_min = min; | |
2804 | return len; | |
2805 | } | |
2806 | ||
2807 | static struct md_sysfs_entry md_sync_min = | |
2808 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
2809 | ||
2810 | static ssize_t | |
2811 | sync_max_show(mddev_t *mddev, char *page) | |
2812 | { | |
2813 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
2814 | mddev->sync_speed_max ? "local": "system"); | |
2815 | } | |
2816 | ||
2817 | static ssize_t | |
2818 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
2819 | { | |
2820 | int max; | |
2821 | char *e; | |
2822 | if (strncmp(buf, "system", 6)==0) { | |
2823 | mddev->sync_speed_max = 0; | |
2824 | return len; | |
2825 | } | |
2826 | max = simple_strtoul(buf, &e, 10); | |
2827 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
2828 | return -EINVAL; | |
2829 | mddev->sync_speed_max = max; | |
2830 | return len; | |
2831 | } | |
2832 | ||
2833 | static struct md_sysfs_entry md_sync_max = | |
2834 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
2835 | ||
2836 | ||
2837 | static ssize_t | |
2838 | sync_speed_show(mddev_t *mddev, char *page) | |
2839 | { | |
2840 | unsigned long resync, dt, db; | |
ff4e8d9a | 2841 | resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)); |
88202a0c N |
2842 | dt = ((jiffies - mddev->resync_mark) / HZ); |
2843 | if (!dt) dt++; | |
2844 | db = resync - (mddev->resync_mark_cnt); | |
2845 | return sprintf(page, "%ld\n", db/dt/2); /* K/sec */ | |
2846 | } | |
2847 | ||
80ca3a44 | 2848 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
2849 | |
2850 | static ssize_t | |
2851 | sync_completed_show(mddev_t *mddev, char *page) | |
2852 | { | |
2853 | unsigned long max_blocks, resync; | |
2854 | ||
2855 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
2856 | max_blocks = mddev->resync_max_sectors; | |
2857 | else | |
2858 | max_blocks = mddev->size << 1; | |
2859 | ||
2860 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
2861 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
2862 | } | |
2863 | ||
80ca3a44 | 2864 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 2865 | |
e464eafd N |
2866 | static ssize_t |
2867 | suspend_lo_show(mddev_t *mddev, char *page) | |
2868 | { | |
2869 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
2870 | } | |
2871 | ||
2872 | static ssize_t | |
2873 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
2874 | { | |
2875 | char *e; | |
2876 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
2877 | ||
2878 | if (mddev->pers->quiesce == NULL) | |
2879 | return -EINVAL; | |
2880 | if (buf == e || (*e && *e != '\n')) | |
2881 | return -EINVAL; | |
2882 | if (new >= mddev->suspend_hi || | |
2883 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
2884 | mddev->suspend_lo = new; | |
2885 | mddev->pers->quiesce(mddev, 2); | |
2886 | return len; | |
2887 | } else | |
2888 | return -EINVAL; | |
2889 | } | |
2890 | static struct md_sysfs_entry md_suspend_lo = | |
2891 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
2892 | ||
2893 | ||
2894 | static ssize_t | |
2895 | suspend_hi_show(mddev_t *mddev, char *page) | |
2896 | { | |
2897 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
2898 | } | |
2899 | ||
2900 | static ssize_t | |
2901 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
2902 | { | |
2903 | char *e; | |
2904 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
2905 | ||
2906 | if (mddev->pers->quiesce == NULL) | |
2907 | return -EINVAL; | |
2908 | if (buf == e || (*e && *e != '\n')) | |
2909 | return -EINVAL; | |
2910 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
2911 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
2912 | mddev->suspend_hi = new; | |
2913 | mddev->pers->quiesce(mddev, 1); | |
2914 | mddev->pers->quiesce(mddev, 0); | |
2915 | return len; | |
2916 | } else | |
2917 | return -EINVAL; | |
2918 | } | |
2919 | static struct md_sysfs_entry md_suspend_hi = | |
2920 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
2921 | ||
08a02ecd N |
2922 | static ssize_t |
2923 | reshape_position_show(mddev_t *mddev, char *page) | |
2924 | { | |
2925 | if (mddev->reshape_position != MaxSector) | |
2926 | return sprintf(page, "%llu\n", | |
2927 | (unsigned long long)mddev->reshape_position); | |
2928 | strcpy(page, "none\n"); | |
2929 | return 5; | |
2930 | } | |
2931 | ||
2932 | static ssize_t | |
2933 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
2934 | { | |
2935 | char *e; | |
2936 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
2937 | if (mddev->pers) | |
2938 | return -EBUSY; | |
2939 | if (buf == e || (*e && *e != '\n')) | |
2940 | return -EINVAL; | |
2941 | mddev->reshape_position = new; | |
2942 | mddev->delta_disks = 0; | |
2943 | mddev->new_level = mddev->level; | |
2944 | mddev->new_layout = mddev->layout; | |
2945 | mddev->new_chunk = mddev->chunk_size; | |
2946 | return len; | |
2947 | } | |
2948 | ||
2949 | static struct md_sysfs_entry md_reshape_position = | |
2950 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
2951 | reshape_position_store); | |
2952 | ||
e464eafd | 2953 | |
eae1701f N |
2954 | static struct attribute *md_default_attrs[] = { |
2955 | &md_level.attr, | |
d4dbd025 | 2956 | &md_layout.attr, |
eae1701f | 2957 | &md_raid_disks.attr, |
3b34380a | 2958 | &md_chunk_size.attr, |
a35b0d69 | 2959 | &md_size.attr, |
a94213b1 | 2960 | &md_resync_start.attr, |
8bb93aac | 2961 | &md_metadata.attr, |
6d7ff738 | 2962 | &md_new_device.attr, |
16f17b39 | 2963 | &md_safe_delay.attr, |
9e653b63 | 2964 | &md_array_state.attr, |
08a02ecd | 2965 | &md_reshape_position.attr, |
411036fa N |
2966 | NULL, |
2967 | }; | |
2968 | ||
2969 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 2970 | &md_scan_mode.attr, |
9d88883e | 2971 | &md_mismatches.attr, |
88202a0c N |
2972 | &md_sync_min.attr, |
2973 | &md_sync_max.attr, | |
2974 | &md_sync_speed.attr, | |
2975 | &md_sync_completed.attr, | |
e464eafd N |
2976 | &md_suspend_lo.attr, |
2977 | &md_suspend_hi.attr, | |
9b1d1dac | 2978 | &md_bitmap.attr, |
eae1701f N |
2979 | NULL, |
2980 | }; | |
411036fa N |
2981 | static struct attribute_group md_redundancy_group = { |
2982 | .name = NULL, | |
2983 | .attrs = md_redundancy_attrs, | |
2984 | }; | |
2985 | ||
eae1701f N |
2986 | |
2987 | static ssize_t | |
2988 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2989 | { | |
2990 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
2991 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 2992 | ssize_t rv; |
eae1701f N |
2993 | |
2994 | if (!entry->show) | |
2995 | return -EIO; | |
5dc5cf7d IM |
2996 | rv = mddev_lock(mddev); |
2997 | if (!rv) { | |
2998 | rv = entry->show(mddev, page); | |
2999 | mddev_unlock(mddev); | |
3000 | } | |
96de1e66 | 3001 | return rv; |
eae1701f N |
3002 | } |
3003 | ||
3004 | static ssize_t | |
3005 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3006 | const char *page, size_t length) | |
3007 | { | |
3008 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3009 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3010 | ssize_t rv; |
eae1701f N |
3011 | |
3012 | if (!entry->store) | |
3013 | return -EIO; | |
67463acb N |
3014 | if (!capable(CAP_SYS_ADMIN)) |
3015 | return -EACCES; | |
5dc5cf7d IM |
3016 | rv = mddev_lock(mddev); |
3017 | if (!rv) { | |
3018 | rv = entry->store(mddev, page, length); | |
3019 | mddev_unlock(mddev); | |
3020 | } | |
96de1e66 | 3021 | return rv; |
eae1701f N |
3022 | } |
3023 | ||
3024 | static void md_free(struct kobject *ko) | |
3025 | { | |
3026 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
3027 | kfree(mddev); | |
3028 | } | |
3029 | ||
3030 | static struct sysfs_ops md_sysfs_ops = { | |
3031 | .show = md_attr_show, | |
3032 | .store = md_attr_store, | |
3033 | }; | |
3034 | static struct kobj_type md_ktype = { | |
3035 | .release = md_free, | |
3036 | .sysfs_ops = &md_sysfs_ops, | |
3037 | .default_attrs = md_default_attrs, | |
3038 | }; | |
3039 | ||
1da177e4 LT |
3040 | int mdp_major = 0; |
3041 | ||
3042 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3043 | { | |
48c9c27b | 3044 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3045 | mddev_t *mddev = mddev_find(dev); |
3046 | struct gendisk *disk; | |
3047 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
3048 | int shift = partitioned ? MdpMinorShift : 0; | |
3049 | int unit = MINOR(dev) >> shift; | |
3050 | ||
3051 | if (!mddev) | |
3052 | return NULL; | |
3053 | ||
48c9c27b | 3054 | mutex_lock(&disks_mutex); |
1da177e4 | 3055 | if (mddev->gendisk) { |
48c9c27b | 3056 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3057 | mddev_put(mddev); |
3058 | return NULL; | |
3059 | } | |
3060 | disk = alloc_disk(1 << shift); | |
3061 | if (!disk) { | |
48c9c27b | 3062 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3063 | mddev_put(mddev); |
3064 | return NULL; | |
3065 | } | |
3066 | disk->major = MAJOR(dev); | |
3067 | disk->first_minor = unit << shift; | |
ce7b0f46 | 3068 | if (partitioned) |
1da177e4 | 3069 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3070 | else |
1da177e4 | 3071 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3072 | disk->fops = &md_fops; |
3073 | disk->private_data = mddev; | |
3074 | disk->queue = mddev->queue; | |
3075 | add_disk(disk); | |
3076 | mddev->gendisk = disk; | |
48c9c27b | 3077 | mutex_unlock(&disks_mutex); |
9c791977 | 3078 | mddev->kobj.parent = &disk->kobj; |
19c38de8 | 3079 | kobject_set_name(&mddev->kobj, "%s", "md"); |
eae1701f | 3080 | mddev->kobj.ktype = &md_ktype; |
5e55e2f5 N |
3081 | if (kobject_register(&mddev->kobj)) |
3082 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", | |
3083 | disk->disk_name); | |
1da177e4 LT |
3084 | return NULL; |
3085 | } | |
3086 | ||
1da177e4 LT |
3087 | static void md_safemode_timeout(unsigned long data) |
3088 | { | |
3089 | mddev_t *mddev = (mddev_t *) data; | |
3090 | ||
3091 | mddev->safemode = 1; | |
3092 | md_wakeup_thread(mddev->thread); | |
3093 | } | |
3094 | ||
6ff8d8ec | 3095 | static int start_dirty_degraded; |
1da177e4 LT |
3096 | |
3097 | static int do_md_run(mddev_t * mddev) | |
3098 | { | |
2604b703 | 3099 | int err; |
1da177e4 LT |
3100 | int chunk_size; |
3101 | struct list_head *tmp; | |
3102 | mdk_rdev_t *rdev; | |
3103 | struct gendisk *disk; | |
2604b703 | 3104 | struct mdk_personality *pers; |
1da177e4 LT |
3105 | char b[BDEVNAME_SIZE]; |
3106 | ||
a757e64c N |
3107 | if (list_empty(&mddev->disks)) |
3108 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3109 | return -EINVAL; |
1da177e4 LT |
3110 | |
3111 | if (mddev->pers) | |
3112 | return -EBUSY; | |
3113 | ||
3114 | /* | |
3115 | * Analyze all RAID superblock(s) | |
3116 | */ | |
a757e64c N |
3117 | if (!mddev->raid_disks) |
3118 | analyze_sbs(mddev); | |
1da177e4 LT |
3119 | |
3120 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3121 | |
3122 | if (chunk_size) { | |
1da177e4 LT |
3123 | if (chunk_size > MAX_CHUNK_SIZE) { |
3124 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3125 | chunk_size, MAX_CHUNK_SIZE); | |
3126 | return -EINVAL; | |
3127 | } | |
3128 | /* | |
3129 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
3130 | */ | |
3131 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3132 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3133 | return -EINVAL; |
3134 | } | |
3135 | if (chunk_size < PAGE_SIZE) { | |
3136 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
3137 | chunk_size, PAGE_SIZE); | |
3138 | return -EINVAL; | |
3139 | } | |
3140 | ||
3141 | /* devices must have minimum size of one chunk */ | |
3142 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 3143 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3144 | continue; |
3145 | if (rdev->size < chunk_size / 1024) { | |
3146 | printk(KERN_WARNING | |
3147 | "md: Dev %s smaller than chunk_size:" | |
3148 | " %lluk < %dk\n", | |
3149 | bdevname(rdev->bdev,b), | |
3150 | (unsigned long long)rdev->size, | |
3151 | chunk_size / 1024); | |
3152 | return -EINVAL; | |
3153 | } | |
3154 | } | |
3155 | } | |
3156 | ||
1da177e4 | 3157 | #ifdef CONFIG_KMOD |
d9d166c2 N |
3158 | if (mddev->level != LEVEL_NONE) |
3159 | request_module("md-level-%d", mddev->level); | |
3160 | else if (mddev->clevel[0]) | |
3161 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3162 | #endif |
3163 | ||
3164 | /* | |
3165 | * Drop all container device buffers, from now on | |
3166 | * the only valid external interface is through the md | |
3167 | * device. | |
1da177e4 LT |
3168 | */ |
3169 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 3170 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3171 | continue; |
3172 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3173 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3174 | |
3175 | /* perform some consistency tests on the device. | |
3176 | * We don't want the data to overlap the metadata, | |
3177 | * Internal Bitmap issues has handled elsewhere. | |
3178 | */ | |
3179 | if (rdev->data_offset < rdev->sb_offset) { | |
3180 | if (mddev->size && | |
3181 | rdev->data_offset + mddev->size*2 | |
3182 | > rdev->sb_offset*2) { | |
3183 | printk("md: %s: data overlaps metadata\n", | |
3184 | mdname(mddev)); | |
3185 | return -EINVAL; | |
3186 | } | |
3187 | } else { | |
3188 | if (rdev->sb_offset*2 + rdev->sb_size/512 | |
3189 | > rdev->data_offset) { | |
3190 | printk("md: %s: metadata overlaps data\n", | |
3191 | mdname(mddev)); | |
3192 | return -EINVAL; | |
3193 | } | |
3194 | } | |
1da177e4 LT |
3195 | } |
3196 | ||
3197 | md_probe(mddev->unit, NULL, NULL); | |
3198 | disk = mddev->gendisk; | |
3199 | if (!disk) | |
3200 | return -ENOMEM; | |
3201 | ||
3202 | spin_lock(&pers_lock); | |
d9d166c2 | 3203 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3204 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3205 | spin_unlock(&pers_lock); |
d9d166c2 N |
3206 | if (mddev->level != LEVEL_NONE) |
3207 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3208 | mddev->level); | |
3209 | else | |
3210 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3211 | mddev->clevel); | |
1da177e4 LT |
3212 | return -EINVAL; |
3213 | } | |
2604b703 | 3214 | mddev->pers = pers; |
1da177e4 | 3215 | spin_unlock(&pers_lock); |
d9d166c2 N |
3216 | mddev->level = pers->level; |
3217 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3218 | |
f6705578 | 3219 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3220 | pers->start_reshape == NULL) { |
f6705578 N |
3221 | /* This personality cannot handle reshaping... */ |
3222 | mddev->pers = NULL; | |
3223 | module_put(pers->owner); | |
3224 | return -EINVAL; | |
3225 | } | |
3226 | ||
7dd5e7c3 N |
3227 | if (pers->sync_request) { |
3228 | /* Warn if this is a potentially silly | |
3229 | * configuration. | |
3230 | */ | |
3231 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3232 | mdk_rdev_t *rdev2; | |
3233 | struct list_head *tmp2; | |
3234 | int warned = 0; | |
3235 | ITERATE_RDEV(mddev, rdev, tmp) { | |
3236 | ITERATE_RDEV(mddev, rdev2, tmp2) { | |
3237 | if (rdev < rdev2 && | |
3238 | rdev->bdev->bd_contains == | |
3239 | rdev2->bdev->bd_contains) { | |
3240 | printk(KERN_WARNING | |
3241 | "%s: WARNING: %s appears to be" | |
3242 | " on the same physical disk as" | |
3243 | " %s.\n", | |
3244 | mdname(mddev), | |
3245 | bdevname(rdev->bdev,b), | |
3246 | bdevname(rdev2->bdev,b2)); | |
3247 | warned = 1; | |
3248 | } | |
3249 | } | |
3250 | } | |
3251 | if (warned) | |
3252 | printk(KERN_WARNING | |
3253 | "True protection against single-disk" | |
3254 | " failure might be compromised.\n"); | |
3255 | } | |
3256 | ||
657390d2 | 3257 | mddev->recovery = 0; |
1da177e4 | 3258 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3259 | mddev->barriers_work = 1; |
6ff8d8ec | 3260 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3261 | |
f91de92e N |
3262 | if (start_readonly) |
3263 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3264 | ||
b15c2e57 N |
3265 | err = mddev->pers->run(mddev); |
3266 | if (!err && mddev->pers->sync_request) { | |
3267 | err = bitmap_create(mddev); | |
3268 | if (err) { | |
3269 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3270 | mdname(mddev), err); | |
3271 | mddev->pers->stop(mddev); | |
3272 | } | |
3273 | } | |
1da177e4 LT |
3274 | if (err) { |
3275 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3276 | module_put(mddev->pers->owner); | |
3277 | mddev->pers = NULL; | |
32a7627c N |
3278 | bitmap_destroy(mddev); |
3279 | return err; | |
1da177e4 | 3280 | } |
5e55e2f5 N |
3281 | if (mddev->pers->sync_request) { |
3282 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3283 | printk(KERN_WARNING | |
3284 | "md: cannot register extra attributes for %s\n", | |
3285 | mdname(mddev)); | |
3286 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ | |
fd9d49ca N |
3287 | mddev->ro = 0; |
3288 | ||
1da177e4 LT |
3289 | atomic_set(&mddev->writes_pending,0); |
3290 | mddev->safemode = 0; | |
3291 | mddev->safemode_timer.function = md_safemode_timeout; | |
3292 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3293 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3294 | mddev->in_sync = 1; |
86e6ffdd N |
3295 | |
3296 | ITERATE_RDEV(mddev,rdev,tmp) | |
3297 | if (rdev->raid_disk >= 0) { | |
3298 | char nm[20]; | |
3299 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3300 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3301 | printk("md: cannot register %s for %s\n", | |
3302 | nm, mdname(mddev)); | |
86e6ffdd | 3303 | } |
1da177e4 LT |
3304 | |
3305 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3306 | ||
850b2b42 N |
3307 | if (mddev->flags) |
3308 | md_update_sb(mddev, 0); | |
1da177e4 LT |
3309 | |
3310 | set_capacity(disk, mddev->array_size<<1); | |
3311 | ||
3312 | /* If we call blk_queue_make_request here, it will | |
3313 | * re-initialise max_sectors etc which may have been | |
3314 | * refined inside -> run. So just set the bits we need to set. | |
3315 | * Most initialisation happended when we called | |
3316 | * blk_queue_make_request(..., md_fail_request) | |
3317 | * earlier. | |
3318 | */ | |
3319 | mddev->queue->queuedata = mddev; | |
3320 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3321 | ||
5fd6c1dc N |
3322 | /* If there is a partially-recovered drive we need to |
3323 | * start recovery here. If we leave it to md_check_recovery, | |
3324 | * it will remove the drives and not do the right thing | |
3325 | */ | |
0b8c9de0 | 3326 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc N |
3327 | struct list_head *rtmp; |
3328 | int spares = 0; | |
3329 | ITERATE_RDEV(mddev,rdev,rtmp) | |
3330 | if (rdev->raid_disk >= 0 && | |
3331 | !test_bit(In_sync, &rdev->flags) && | |
3332 | !test_bit(Faulty, &rdev->flags)) | |
3333 | /* complete an interrupted recovery */ | |
3334 | spares++; | |
3335 | if (spares && mddev->pers->sync_request) { | |
3336 | mddev->recovery = 0; | |
3337 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3338 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3339 | mddev, | |
3340 | "%s_resync"); | |
3341 | if (!mddev->sync_thread) { | |
3342 | printk(KERN_ERR "%s: could not start resync" | |
3343 | " thread...\n", | |
3344 | mdname(mddev)); | |
3345 | /* leave the spares where they are, it shouldn't hurt */ | |
3346 | mddev->recovery = 0; | |
0b8c9de0 | 3347 | } |
5fd6c1dc N |
3348 | } |
3349 | } | |
0b8c9de0 N |
3350 | md_wakeup_thread(mddev->thread); |
3351 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3352 | |
44ce6294 | 3353 | mddev->changed = 1; |
d7603b7e | 3354 | md_new_event(mddev); |
2f471303 | 3355 | kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE); |
1da177e4 LT |
3356 | return 0; |
3357 | } | |
3358 | ||
3359 | static int restart_array(mddev_t *mddev) | |
3360 | { | |
3361 | struct gendisk *disk = mddev->gendisk; | |
3362 | int err; | |
3363 | ||
3364 | /* | |
3365 | * Complain if it has no devices | |
3366 | */ | |
3367 | err = -ENXIO; | |
3368 | if (list_empty(&mddev->disks)) | |
3369 | goto out; | |
3370 | ||
3371 | if (mddev->pers) { | |
3372 | err = -EBUSY; | |
3373 | if (!mddev->ro) | |
3374 | goto out; | |
3375 | ||
3376 | mddev->safemode = 0; | |
3377 | mddev->ro = 0; | |
3378 | set_disk_ro(disk, 0); | |
3379 | ||
3380 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3381 | mdname(mddev)); | |
3382 | /* | |
3383 | * Kick recovery or resync if necessary | |
3384 | */ | |
3385 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3386 | md_wakeup_thread(mddev->thread); | |
5fd6c1dc | 3387 | md_wakeup_thread(mddev->sync_thread); |
1da177e4 | 3388 | err = 0; |
9e653b63 | 3389 | } else |
1da177e4 | 3390 | err = -EINVAL; |
1da177e4 LT |
3391 | |
3392 | out: | |
3393 | return err; | |
3394 | } | |
3395 | ||
acc55e22 N |
3396 | /* similar to deny_write_access, but accounts for our holding a reference |
3397 | * to the file ourselves */ | |
3398 | static int deny_bitmap_write_access(struct file * file) | |
3399 | { | |
3400 | struct inode *inode = file->f_mapping->host; | |
3401 | ||
3402 | spin_lock(&inode->i_lock); | |
3403 | if (atomic_read(&inode->i_writecount) > 1) { | |
3404 | spin_unlock(&inode->i_lock); | |
3405 | return -ETXTBSY; | |
3406 | } | |
3407 | atomic_set(&inode->i_writecount, -1); | |
3408 | spin_unlock(&inode->i_lock); | |
3409 | ||
3410 | return 0; | |
3411 | } | |
3412 | ||
3413 | static void restore_bitmap_write_access(struct file *file) | |
3414 | { | |
3415 | struct inode *inode = file->f_mapping->host; | |
3416 | ||
3417 | spin_lock(&inode->i_lock); | |
3418 | atomic_set(&inode->i_writecount, 1); | |
3419 | spin_unlock(&inode->i_lock); | |
3420 | } | |
3421 | ||
9e653b63 N |
3422 | /* mode: |
3423 | * 0 - completely stop and dis-assemble array | |
3424 | * 1 - switch to readonly | |
3425 | * 2 - stop but do not disassemble array | |
3426 | */ | |
3427 | static int do_md_stop(mddev_t * mddev, int mode) | |
1da177e4 LT |
3428 | { |
3429 | int err = 0; | |
3430 | struct gendisk *disk = mddev->gendisk; | |
3431 | ||
3432 | if (mddev->pers) { | |
3433 | if (atomic_read(&mddev->active)>2) { | |
3434 | printk("md: %s still in use.\n",mdname(mddev)); | |
3435 | return -EBUSY; | |
3436 | } | |
3437 | ||
3438 | if (mddev->sync_thread) { | |
5fd6c1dc | 3439 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3440 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3441 | md_unregister_thread(mddev->sync_thread); | |
3442 | mddev->sync_thread = NULL; | |
3443 | } | |
3444 | ||
3445 | del_timer_sync(&mddev->safemode_timer); | |
3446 | ||
3447 | invalidate_partition(disk, 0); | |
3448 | ||
9e653b63 N |
3449 | switch(mode) { |
3450 | case 1: /* readonly */ | |
1da177e4 | 3451 | err = -ENXIO; |
f91de92e | 3452 | if (mddev->ro==1) |
1da177e4 LT |
3453 | goto out; |
3454 | mddev->ro = 1; | |
9e653b63 N |
3455 | break; |
3456 | case 0: /* disassemble */ | |
3457 | case 2: /* stop */ | |
6b8b3e8a | 3458 | bitmap_flush(mddev); |
a9701a30 | 3459 | md_super_wait(mddev); |
1da177e4 LT |
3460 | if (mddev->ro) |
3461 | set_disk_ro(disk, 0); | |
3462 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3463 | mddev->pers->stop(mddev); | |
d1b5380c N |
3464 | mddev->queue->merge_bvec_fn = NULL; |
3465 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 3466 | mddev->queue->backing_dev_info.congested_fn = NULL; |
411036fa N |
3467 | if (mddev->pers->sync_request) |
3468 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
3469 | ||
1da177e4 LT |
3470 | module_put(mddev->pers->owner); |
3471 | mddev->pers = NULL; | |
0d4ca600 N |
3472 | |
3473 | set_capacity(disk, 0); | |
44ce6294 | 3474 | mddev->changed = 1; |
0d4ca600 | 3475 | |
1da177e4 LT |
3476 | if (mddev->ro) |
3477 | mddev->ro = 0; | |
3478 | } | |
850b2b42 | 3479 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
3480 | /* mark array as shutdown cleanly */ |
3481 | mddev->in_sync = 1; | |
850b2b42 | 3482 | md_update_sb(mddev, 1); |
1da177e4 | 3483 | } |
9e653b63 | 3484 | if (mode == 1) |
1da177e4 | 3485 | set_disk_ro(disk, 1); |
5fd6c1dc | 3486 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3487 | } |
32a7627c | 3488 | |
1da177e4 LT |
3489 | /* |
3490 | * Free resources if final stop | |
3491 | */ | |
9e653b63 | 3492 | if (mode == 0) { |
86e6ffdd N |
3493 | mdk_rdev_t *rdev; |
3494 | struct list_head *tmp; | |
0d4ca600 | 3495 | |
1da177e4 LT |
3496 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
3497 | ||
978f946b N |
3498 | bitmap_destroy(mddev); |
3499 | if (mddev->bitmap_file) { | |
acc55e22 | 3500 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3501 | fput(mddev->bitmap_file); |
3502 | mddev->bitmap_file = NULL; | |
3503 | } | |
3504 | mddev->bitmap_offset = 0; | |
3505 | ||
86e6ffdd N |
3506 | ITERATE_RDEV(mddev,rdev,tmp) |
3507 | if (rdev->raid_disk >= 0) { | |
3508 | char nm[20]; | |
3509 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3510 | sysfs_remove_link(&mddev->kobj, nm); | |
3511 | } | |
3512 | ||
5792a285 N |
3513 | /* make sure all delayed_delete calls have finished */ |
3514 | flush_scheduled_work(); | |
3515 | ||
1da177e4 LT |
3516 | export_array(mddev); |
3517 | ||
3518 | mddev->array_size = 0; | |
9e653b63 N |
3519 | mddev->size = 0; |
3520 | mddev->raid_disks = 0; | |
a94213b1 | 3521 | mddev->recovery_cp = 0; |
08a02ecd | 3522 | mddev->reshape_position = MaxSector; |
9e653b63 | 3523 | |
a8a55c38 | 3524 | } else if (mddev->pers) |
1da177e4 LT |
3525 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
3526 | mdname(mddev)); | |
3527 | err = 0; | |
d7603b7e | 3528 | md_new_event(mddev); |
1da177e4 LT |
3529 | out: |
3530 | return err; | |
3531 | } | |
3532 | ||
fdee8ae4 | 3533 | #ifndef MODULE |
1da177e4 LT |
3534 | static void autorun_array(mddev_t *mddev) |
3535 | { | |
3536 | mdk_rdev_t *rdev; | |
3537 | struct list_head *tmp; | |
3538 | int err; | |
3539 | ||
a757e64c | 3540 | if (list_empty(&mddev->disks)) |
1da177e4 | 3541 | return; |
1da177e4 LT |
3542 | |
3543 | printk(KERN_INFO "md: running: "); | |
3544 | ||
3545 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3546 | char b[BDEVNAME_SIZE]; | |
3547 | printk("<%s>", bdevname(rdev->bdev,b)); | |
3548 | } | |
3549 | printk("\n"); | |
3550 | ||
3551 | err = do_md_run (mddev); | |
3552 | if (err) { | |
3553 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
3554 | do_md_stop (mddev, 0); | |
3555 | } | |
3556 | } | |
3557 | ||
3558 | /* | |
3559 | * lets try to run arrays based on all disks that have arrived | |
3560 | * until now. (those are in pending_raid_disks) | |
3561 | * | |
3562 | * the method: pick the first pending disk, collect all disks with | |
3563 | * the same UUID, remove all from the pending list and put them into | |
3564 | * the 'same_array' list. Then order this list based on superblock | |
3565 | * update time (freshest comes first), kick out 'old' disks and | |
3566 | * compare superblocks. If everything's fine then run it. | |
3567 | * | |
3568 | * If "unit" is allocated, then bump its reference count | |
3569 | */ | |
3570 | static void autorun_devices(int part) | |
3571 | { | |
1da177e4 LT |
3572 | struct list_head *tmp; |
3573 | mdk_rdev_t *rdev0, *rdev; | |
3574 | mddev_t *mddev; | |
3575 | char b[BDEVNAME_SIZE]; | |
3576 | ||
3577 | printk(KERN_INFO "md: autorun ...\n"); | |
3578 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 3579 | int unit; |
1da177e4 | 3580 | dev_t dev; |
ad01c9e3 | 3581 | LIST_HEAD(candidates); |
1da177e4 LT |
3582 | rdev0 = list_entry(pending_raid_disks.next, |
3583 | mdk_rdev_t, same_set); | |
3584 | ||
3585 | printk(KERN_INFO "md: considering %s ...\n", | |
3586 | bdevname(rdev0->bdev,b)); | |
3587 | INIT_LIST_HEAD(&candidates); | |
3588 | ITERATE_RDEV_PENDING(rdev,tmp) | |
3589 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
3590 | printk(KERN_INFO "md: adding %s ...\n", | |
3591 | bdevname(rdev->bdev,b)); | |
3592 | list_move(&rdev->same_set, &candidates); | |
3593 | } | |
3594 | /* | |
3595 | * now we have a set of devices, with all of them having | |
3596 | * mostly sane superblocks. It's time to allocate the | |
3597 | * mddev. | |
3598 | */ | |
e8703fe1 N |
3599 | if (part) { |
3600 | dev = MKDEV(mdp_major, | |
3601 | rdev0->preferred_minor << MdpMinorShift); | |
3602 | unit = MINOR(dev) >> MdpMinorShift; | |
3603 | } else { | |
3604 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
3605 | unit = MINOR(dev); | |
3606 | } | |
3607 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
3608 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
3609 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
3610 | break; | |
3611 | } | |
1da177e4 LT |
3612 | |
3613 | md_probe(dev, NULL, NULL); | |
3614 | mddev = mddev_find(dev); | |
3615 | if (!mddev) { | |
3616 | printk(KERN_ERR | |
3617 | "md: cannot allocate memory for md drive.\n"); | |
3618 | break; | |
3619 | } | |
3620 | if (mddev_lock(mddev)) | |
3621 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
3622 | mdname(mddev)); | |
3623 | else if (mddev->raid_disks || mddev->major_version | |
3624 | || !list_empty(&mddev->disks)) { | |
3625 | printk(KERN_WARNING | |
3626 | "md: %s already running, cannot run %s\n", | |
3627 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
3628 | mddev_unlock(mddev); | |
3629 | } else { | |
3630 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
3631 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
3632 | list_del_init(&rdev->same_set); | |
3633 | if (bind_rdev_to_array(rdev, mddev)) | |
3634 | export_rdev(rdev); | |
3635 | } | |
3636 | autorun_array(mddev); | |
3637 | mddev_unlock(mddev); | |
3638 | } | |
3639 | /* on success, candidates will be empty, on error | |
3640 | * it won't... | |
3641 | */ | |
3642 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
3643 | export_rdev(rdev); | |
3644 | mddev_put(mddev); | |
3645 | } | |
3646 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
3647 | } | |
fdee8ae4 | 3648 | #endif /* !MODULE */ |
1da177e4 | 3649 | |
1da177e4 LT |
3650 | static int get_version(void __user * arg) |
3651 | { | |
3652 | mdu_version_t ver; | |
3653 | ||
3654 | ver.major = MD_MAJOR_VERSION; | |
3655 | ver.minor = MD_MINOR_VERSION; | |
3656 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
3657 | ||
3658 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
3659 | return -EFAULT; | |
3660 | ||
3661 | return 0; | |
3662 | } | |
3663 | ||
3664 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
3665 | { | |
3666 | mdu_array_info_t info; | |
3667 | int nr,working,active,failed,spare; | |
3668 | mdk_rdev_t *rdev; | |
3669 | struct list_head *tmp; | |
3670 | ||
3671 | nr=working=active=failed=spare=0; | |
3672 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3673 | nr++; | |
b2d444d7 | 3674 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3675 | failed++; |
3676 | else { | |
3677 | working++; | |
b2d444d7 | 3678 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
3679 | active++; |
3680 | else | |
3681 | spare++; | |
3682 | } | |
3683 | } | |
3684 | ||
3685 | info.major_version = mddev->major_version; | |
3686 | info.minor_version = mddev->minor_version; | |
3687 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
3688 | info.ctime = mddev->ctime; | |
3689 | info.level = mddev->level; | |
3690 | info.size = mddev->size; | |
284ae7ca N |
3691 | if (info.size != mddev->size) /* overflow */ |
3692 | info.size = -1; | |
1da177e4 LT |
3693 | info.nr_disks = nr; |
3694 | info.raid_disks = mddev->raid_disks; | |
3695 | info.md_minor = mddev->md_minor; | |
3696 | info.not_persistent= !mddev->persistent; | |
3697 | ||
3698 | info.utime = mddev->utime; | |
3699 | info.state = 0; | |
3700 | if (mddev->in_sync) | |
3701 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
3702 | if (mddev->bitmap && mddev->bitmap_offset) |
3703 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3704 | info.active_disks = active; |
3705 | info.working_disks = working; | |
3706 | info.failed_disks = failed; | |
3707 | info.spare_disks = spare; | |
3708 | ||
3709 | info.layout = mddev->layout; | |
3710 | info.chunk_size = mddev->chunk_size; | |
3711 | ||
3712 | if (copy_to_user(arg, &info, sizeof(info))) | |
3713 | return -EFAULT; | |
3714 | ||
3715 | return 0; | |
3716 | } | |
3717 | ||
87162a28 | 3718 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
3719 | { |
3720 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
3721 | char *ptr, *buf = NULL; | |
3722 | int err = -ENOMEM; | |
3723 | ||
2a2275d6 N |
3724 | md_allow_write(mddev); |
3725 | ||
32a7627c N |
3726 | file = kmalloc(sizeof(*file), GFP_KERNEL); |
3727 | if (!file) | |
3728 | goto out; | |
3729 | ||
3730 | /* bitmap disabled, zero the first byte and copy out */ | |
3731 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
3732 | file->pathname[0] = '\0'; | |
3733 | goto copy_out; | |
3734 | } | |
3735 | ||
3736 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
3737 | if (!buf) | |
3738 | goto out; | |
3739 | ||
3740 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
3741 | if (!ptr) | |
3742 | goto out; | |
3743 | ||
3744 | strcpy(file->pathname, ptr); | |
3745 | ||
3746 | copy_out: | |
3747 | err = 0; | |
3748 | if (copy_to_user(arg, file, sizeof(*file))) | |
3749 | err = -EFAULT; | |
3750 | out: | |
3751 | kfree(buf); | |
3752 | kfree(file); | |
3753 | return err; | |
3754 | } | |
3755 | ||
1da177e4 LT |
3756 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
3757 | { | |
3758 | mdu_disk_info_t info; | |
3759 | unsigned int nr; | |
3760 | mdk_rdev_t *rdev; | |
3761 | ||
3762 | if (copy_from_user(&info, arg, sizeof(info))) | |
3763 | return -EFAULT; | |
3764 | ||
3765 | nr = info.number; | |
3766 | ||
3767 | rdev = find_rdev_nr(mddev, nr); | |
3768 | if (rdev) { | |
3769 | info.major = MAJOR(rdev->bdev->bd_dev); | |
3770 | info.minor = MINOR(rdev->bdev->bd_dev); | |
3771 | info.raid_disk = rdev->raid_disk; | |
3772 | info.state = 0; | |
b2d444d7 | 3773 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3774 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 3775 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
3776 | info.state |= (1<<MD_DISK_ACTIVE); |
3777 | info.state |= (1<<MD_DISK_SYNC); | |
3778 | } | |
8ddf9efe N |
3779 | if (test_bit(WriteMostly, &rdev->flags)) |
3780 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
3781 | } else { |
3782 | info.major = info.minor = 0; | |
3783 | info.raid_disk = -1; | |
3784 | info.state = (1<<MD_DISK_REMOVED); | |
3785 | } | |
3786 | ||
3787 | if (copy_to_user(arg, &info, sizeof(info))) | |
3788 | return -EFAULT; | |
3789 | ||
3790 | return 0; | |
3791 | } | |
3792 | ||
3793 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
3794 | { | |
3795 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3796 | mdk_rdev_t *rdev; | |
3797 | dev_t dev = MKDEV(info->major,info->minor); | |
3798 | ||
3799 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
3800 | return -EOVERFLOW; | |
3801 | ||
3802 | if (!mddev->raid_disks) { | |
3803 | int err; | |
3804 | /* expecting a device which has a superblock */ | |
3805 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
3806 | if (IS_ERR(rdev)) { | |
3807 | printk(KERN_WARNING | |
3808 | "md: md_import_device returned %ld\n", | |
3809 | PTR_ERR(rdev)); | |
3810 | return PTR_ERR(rdev); | |
3811 | } | |
3812 | if (!list_empty(&mddev->disks)) { | |
3813 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3814 | mdk_rdev_t, same_set); | |
3815 | int err = super_types[mddev->major_version] | |
3816 | .load_super(rdev, rdev0, mddev->minor_version); | |
3817 | if (err < 0) { | |
3818 | printk(KERN_WARNING | |
3819 | "md: %s has different UUID to %s\n", | |
3820 | bdevname(rdev->bdev,b), | |
3821 | bdevname(rdev0->bdev,b2)); | |
3822 | export_rdev(rdev); | |
3823 | return -EINVAL; | |
3824 | } | |
3825 | } | |
3826 | err = bind_rdev_to_array(rdev, mddev); | |
3827 | if (err) | |
3828 | export_rdev(rdev); | |
3829 | return err; | |
3830 | } | |
3831 | ||
3832 | /* | |
3833 | * add_new_disk can be used once the array is assembled | |
3834 | * to add "hot spares". They must already have a superblock | |
3835 | * written | |
3836 | */ | |
3837 | if (mddev->pers) { | |
3838 | int err; | |
3839 | if (!mddev->pers->hot_add_disk) { | |
3840 | printk(KERN_WARNING | |
3841 | "%s: personality does not support diskops!\n", | |
3842 | mdname(mddev)); | |
3843 | return -EINVAL; | |
3844 | } | |
7b1e35f6 N |
3845 | if (mddev->persistent) |
3846 | rdev = md_import_device(dev, mddev->major_version, | |
3847 | mddev->minor_version); | |
3848 | else | |
3849 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
3850 | if (IS_ERR(rdev)) { |
3851 | printk(KERN_WARNING | |
3852 | "md: md_import_device returned %ld\n", | |
3853 | PTR_ERR(rdev)); | |
3854 | return PTR_ERR(rdev); | |
3855 | } | |
41158c7e N |
3856 | /* set save_raid_disk if appropriate */ |
3857 | if (!mddev->persistent) { | |
3858 | if (info->state & (1<<MD_DISK_SYNC) && | |
3859 | info->raid_disk < mddev->raid_disks) | |
3860 | rdev->raid_disk = info->raid_disk; | |
3861 | else | |
3862 | rdev->raid_disk = -1; | |
3863 | } else | |
3864 | super_types[mddev->major_version]. | |
3865 | validate_super(mddev, rdev); | |
3866 | rdev->saved_raid_disk = rdev->raid_disk; | |
3867 | ||
b2d444d7 | 3868 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
3869 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
3870 | set_bit(WriteMostly, &rdev->flags); | |
3871 | ||
1da177e4 LT |
3872 | rdev->raid_disk = -1; |
3873 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
3874 | if (!err && !mddev->pers->hot_remove_disk) { |
3875 | /* If there is hot_add_disk but no hot_remove_disk | |
3876 | * then added disks for geometry changes, | |
3877 | * and should be added immediately. | |
3878 | */ | |
3879 | super_types[mddev->major_version]. | |
3880 | validate_super(mddev, rdev); | |
3881 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
3882 | if (err) | |
3883 | unbind_rdev_from_array(rdev); | |
3884 | } | |
1da177e4 LT |
3885 | if (err) |
3886 | export_rdev(rdev); | |
c361777f | 3887 | |
17571284 | 3888 | md_update_sb(mddev, 1); |
c361777f | 3889 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 3890 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
3891 | return err; |
3892 | } | |
3893 | ||
3894 | /* otherwise, add_new_disk is only allowed | |
3895 | * for major_version==0 superblocks | |
3896 | */ | |
3897 | if (mddev->major_version != 0) { | |
3898 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
3899 | mdname(mddev)); | |
3900 | return -EINVAL; | |
3901 | } | |
3902 | ||
3903 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
3904 | int err; | |
3905 | rdev = md_import_device (dev, -1, 0); | |
3906 | if (IS_ERR(rdev)) { | |
3907 | printk(KERN_WARNING | |
3908 | "md: error, md_import_device() returned %ld\n", | |
3909 | PTR_ERR(rdev)); | |
3910 | return PTR_ERR(rdev); | |
3911 | } | |
3912 | rdev->desc_nr = info->number; | |
3913 | if (info->raid_disk < mddev->raid_disks) | |
3914 | rdev->raid_disk = info->raid_disk; | |
3915 | else | |
3916 | rdev->raid_disk = -1; | |
3917 | ||
b2d444d7 N |
3918 | rdev->flags = 0; |
3919 | ||
1da177e4 | 3920 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
3921 | if (info->state & (1<<MD_DISK_SYNC)) |
3922 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 3923 | |
8ddf9efe N |
3924 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
3925 | set_bit(WriteMostly, &rdev->flags); | |
3926 | ||
1da177e4 LT |
3927 | if (!mddev->persistent) { |
3928 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
3929 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
3930 | } else | |
3931 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
3932 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
3933 | ||
2bf071bf N |
3934 | err = bind_rdev_to_array(rdev, mddev); |
3935 | if (err) { | |
3936 | export_rdev(rdev); | |
3937 | return err; | |
3938 | } | |
1da177e4 LT |
3939 | } |
3940 | ||
3941 | return 0; | |
3942 | } | |
3943 | ||
3944 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
3945 | { | |
3946 | char b[BDEVNAME_SIZE]; | |
3947 | mdk_rdev_t *rdev; | |
3948 | ||
3949 | if (!mddev->pers) | |
3950 | return -ENODEV; | |
3951 | ||
3952 | rdev = find_rdev(mddev, dev); | |
3953 | if (!rdev) | |
3954 | return -ENXIO; | |
3955 | ||
3956 | if (rdev->raid_disk >= 0) | |
3957 | goto busy; | |
3958 | ||
3959 | kick_rdev_from_array(rdev); | |
850b2b42 | 3960 | md_update_sb(mddev, 1); |
d7603b7e | 3961 | md_new_event(mddev); |
1da177e4 LT |
3962 | |
3963 | return 0; | |
3964 | busy: | |
3965 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
3966 | bdevname(rdev->bdev,b), mdname(mddev)); | |
3967 | return -EBUSY; | |
3968 | } | |
3969 | ||
3970 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
3971 | { | |
3972 | char b[BDEVNAME_SIZE]; | |
3973 | int err; | |
3974 | unsigned int size; | |
3975 | mdk_rdev_t *rdev; | |
3976 | ||
3977 | if (!mddev->pers) | |
3978 | return -ENODEV; | |
3979 | ||
3980 | if (mddev->major_version != 0) { | |
3981 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
3982 | " version-0 superblocks.\n", | |
3983 | mdname(mddev)); | |
3984 | return -EINVAL; | |
3985 | } | |
3986 | if (!mddev->pers->hot_add_disk) { | |
3987 | printk(KERN_WARNING | |
3988 | "%s: personality does not support diskops!\n", | |
3989 | mdname(mddev)); | |
3990 | return -EINVAL; | |
3991 | } | |
3992 | ||
3993 | rdev = md_import_device (dev, -1, 0); | |
3994 | if (IS_ERR(rdev)) { | |
3995 | printk(KERN_WARNING | |
3996 | "md: error, md_import_device() returned %ld\n", | |
3997 | PTR_ERR(rdev)); | |
3998 | return -EINVAL; | |
3999 | } | |
4000 | ||
4001 | if (mddev->persistent) | |
4002 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
4003 | else | |
4004 | rdev->sb_offset = | |
4005 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
4006 | ||
4007 | size = calc_dev_size(rdev, mddev->chunk_size); | |
4008 | rdev->size = size; | |
4009 | ||
b2d444d7 | 4010 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4011 | printk(KERN_WARNING |
4012 | "md: can not hot-add faulty %s disk to %s!\n", | |
4013 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4014 | err = -EINVAL; | |
4015 | goto abort_export; | |
4016 | } | |
b2d444d7 | 4017 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4018 | rdev->desc_nr = -1; |
5842730d | 4019 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4020 | err = bind_rdev_to_array(rdev, mddev); |
4021 | if (err) | |
4022 | goto abort_export; | |
1da177e4 LT |
4023 | |
4024 | /* | |
4025 | * The rest should better be atomic, we can have disk failures | |
4026 | * noticed in interrupt contexts ... | |
4027 | */ | |
4028 | ||
4029 | if (rdev->desc_nr == mddev->max_disks) { | |
4030 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4031 | mdname(mddev)); | |
4032 | err = -EBUSY; | |
4033 | goto abort_unbind_export; | |
4034 | } | |
4035 | ||
4036 | rdev->raid_disk = -1; | |
4037 | ||
850b2b42 | 4038 | md_update_sb(mddev, 1); |
1da177e4 LT |
4039 | |
4040 | /* | |
4041 | * Kick recovery, maybe this spare has to be added to the | |
4042 | * array immediately. | |
4043 | */ | |
4044 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4045 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4046 | md_new_event(mddev); |
1da177e4 LT |
4047 | return 0; |
4048 | ||
4049 | abort_unbind_export: | |
4050 | unbind_rdev_from_array(rdev); | |
4051 | ||
4052 | abort_export: | |
4053 | export_rdev(rdev); | |
4054 | return err; | |
4055 | } | |
4056 | ||
32a7627c N |
4057 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4058 | { | |
4059 | int err; | |
4060 | ||
36fa3063 N |
4061 | if (mddev->pers) { |
4062 | if (!mddev->pers->quiesce) | |
4063 | return -EBUSY; | |
4064 | if (mddev->recovery || mddev->sync_thread) | |
4065 | return -EBUSY; | |
4066 | /* we should be able to change the bitmap.. */ | |
4067 | } | |
32a7627c | 4068 | |
32a7627c | 4069 | |
36fa3063 N |
4070 | if (fd >= 0) { |
4071 | if (mddev->bitmap) | |
4072 | return -EEXIST; /* cannot add when bitmap is present */ | |
4073 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4074 | |
36fa3063 N |
4075 | if (mddev->bitmap_file == NULL) { |
4076 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4077 | mdname(mddev)); | |
4078 | return -EBADF; | |
4079 | } | |
4080 | ||
4081 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4082 | if (err) { | |
4083 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4084 | mdname(mddev)); | |
4085 | fput(mddev->bitmap_file); | |
4086 | mddev->bitmap_file = NULL; | |
4087 | return err; | |
4088 | } | |
a654b9d8 | 4089 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4090 | } else if (mddev->bitmap == NULL) |
4091 | return -ENOENT; /* cannot remove what isn't there */ | |
4092 | err = 0; | |
4093 | if (mddev->pers) { | |
4094 | mddev->pers->quiesce(mddev, 1); | |
4095 | if (fd >= 0) | |
4096 | err = bitmap_create(mddev); | |
d7375ab3 | 4097 | if (fd < 0 || err) { |
36fa3063 | 4098 | bitmap_destroy(mddev); |
d7375ab3 N |
4099 | fd = -1; /* make sure to put the file */ |
4100 | } | |
36fa3063 | 4101 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4102 | } |
4103 | if (fd < 0) { | |
acc55e22 N |
4104 | if (mddev->bitmap_file) { |
4105 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4106 | fput(mddev->bitmap_file); |
acc55e22 | 4107 | } |
36fa3063 N |
4108 | mddev->bitmap_file = NULL; |
4109 | } | |
4110 | ||
32a7627c N |
4111 | return err; |
4112 | } | |
4113 | ||
1da177e4 LT |
4114 | /* |
4115 | * set_array_info is used two different ways | |
4116 | * The original usage is when creating a new array. | |
4117 | * In this usage, raid_disks is > 0 and it together with | |
4118 | * level, size, not_persistent,layout,chunksize determine the | |
4119 | * shape of the array. | |
4120 | * This will always create an array with a type-0.90.0 superblock. | |
4121 | * The newer usage is when assembling an array. | |
4122 | * In this case raid_disks will be 0, and the major_version field is | |
4123 | * use to determine which style super-blocks are to be found on the devices. | |
4124 | * The minor and patch _version numbers are also kept incase the | |
4125 | * super_block handler wishes to interpret them. | |
4126 | */ | |
4127 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4128 | { | |
4129 | ||
4130 | if (info->raid_disks == 0) { | |
4131 | /* just setting version number for superblock loading */ | |
4132 | if (info->major_version < 0 || | |
50511da3 | 4133 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4134 | super_types[info->major_version].name == NULL) { |
4135 | /* maybe try to auto-load a module? */ | |
4136 | printk(KERN_INFO | |
4137 | "md: superblock version %d not known\n", | |
4138 | info->major_version); | |
4139 | return -EINVAL; | |
4140 | } | |
4141 | mddev->major_version = info->major_version; | |
4142 | mddev->minor_version = info->minor_version; | |
4143 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4144 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4145 | return 0; |
4146 | } | |
4147 | mddev->major_version = MD_MAJOR_VERSION; | |
4148 | mddev->minor_version = MD_MINOR_VERSION; | |
4149 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4150 | mddev->ctime = get_seconds(); | |
4151 | ||
4152 | mddev->level = info->level; | |
17115e03 | 4153 | mddev->clevel[0] = 0; |
1da177e4 LT |
4154 | mddev->size = info->size; |
4155 | mddev->raid_disks = info->raid_disks; | |
4156 | /* don't set md_minor, it is determined by which /dev/md* was | |
4157 | * openned | |
4158 | */ | |
4159 | if (info->state & (1<<MD_SB_CLEAN)) | |
4160 | mddev->recovery_cp = MaxSector; | |
4161 | else | |
4162 | mddev->recovery_cp = 0; | |
4163 | mddev->persistent = ! info->not_persistent; | |
4164 | ||
4165 | mddev->layout = info->layout; | |
4166 | mddev->chunk_size = info->chunk_size; | |
4167 | ||
4168 | mddev->max_disks = MD_SB_DISKS; | |
4169 | ||
850b2b42 N |
4170 | mddev->flags = 0; |
4171 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1da177e4 | 4172 | |
b2a2703c N |
4173 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4174 | mddev->bitmap_offset = 0; | |
4175 | ||
f6705578 N |
4176 | mddev->reshape_position = MaxSector; |
4177 | ||
1da177e4 LT |
4178 | /* |
4179 | * Generate a 128 bit UUID | |
4180 | */ | |
4181 | get_random_bytes(mddev->uuid, 16); | |
4182 | ||
f6705578 N |
4183 | mddev->new_level = mddev->level; |
4184 | mddev->new_chunk = mddev->chunk_size; | |
4185 | mddev->new_layout = mddev->layout; | |
4186 | mddev->delta_disks = 0; | |
4187 | ||
1da177e4 LT |
4188 | return 0; |
4189 | } | |
4190 | ||
a35b0d69 N |
4191 | static int update_size(mddev_t *mddev, unsigned long size) |
4192 | { | |
4193 | mdk_rdev_t * rdev; | |
4194 | int rv; | |
4195 | struct list_head *tmp; | |
8ddeeae5 | 4196 | int fit = (size == 0); |
a35b0d69 N |
4197 | |
4198 | if (mddev->pers->resize == NULL) | |
4199 | return -EINVAL; | |
4200 | /* The "size" is the amount of each device that is used. | |
4201 | * This can only make sense for arrays with redundancy. | |
4202 | * linear and raid0 always use whatever space is available | |
4203 | * We can only consider changing the size if no resync | |
4204 | * or reconstruction is happening, and if the new size | |
4205 | * is acceptable. It must fit before the sb_offset or, | |
4206 | * if that is <data_offset, it must fit before the | |
4207 | * size of each device. | |
4208 | * If size is zero, we find the largest size that fits. | |
4209 | */ | |
4210 | if (mddev->sync_thread) | |
4211 | return -EBUSY; | |
4212 | ITERATE_RDEV(mddev,rdev,tmp) { | |
4213 | sector_t avail; | |
01ab5662 N |
4214 | avail = rdev->size * 2; |
4215 | ||
a35b0d69 N |
4216 | if (fit && (size == 0 || size > avail/2)) |
4217 | size = avail/2; | |
4218 | if (avail < ((sector_t)size << 1)) | |
4219 | return -ENOSPC; | |
4220 | } | |
4221 | rv = mddev->pers->resize(mddev, (sector_t)size *2); | |
4222 | if (!rv) { | |
4223 | struct block_device *bdev; | |
4224 | ||
4225 | bdev = bdget_disk(mddev->gendisk, 0); | |
4226 | if (bdev) { | |
1b1dcc1b | 4227 | mutex_lock(&bdev->bd_inode->i_mutex); |
6d89332b | 4228 | i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10); |
1b1dcc1b | 4229 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4230 | bdput(bdev); |
4231 | } | |
4232 | } | |
4233 | return rv; | |
4234 | } | |
4235 | ||
da943b99 N |
4236 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4237 | { | |
4238 | int rv; | |
4239 | /* change the number of raid disks */ | |
63c70c4f | 4240 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4241 | return -EINVAL; |
4242 | if (raid_disks <= 0 || | |
4243 | raid_disks >= mddev->max_disks) | |
4244 | return -EINVAL; | |
63c70c4f | 4245 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4246 | return -EBUSY; |
63c70c4f N |
4247 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4248 | ||
4249 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4250 | return rv; |
4251 | } | |
4252 | ||
4253 | ||
1da177e4 LT |
4254 | /* |
4255 | * update_array_info is used to change the configuration of an | |
4256 | * on-line array. | |
4257 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4258 | * fields in the info are checked against the array. | |
4259 | * Any differences that cannot be handled will cause an error. | |
4260 | * Normally, only one change can be managed at a time. | |
4261 | */ | |
4262 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4263 | { | |
4264 | int rv = 0; | |
4265 | int cnt = 0; | |
36fa3063 N |
4266 | int state = 0; |
4267 | ||
4268 | /* calculate expected state,ignoring low bits */ | |
4269 | if (mddev->bitmap && mddev->bitmap_offset) | |
4270 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4271 | |
4272 | if (mddev->major_version != info->major_version || | |
4273 | mddev->minor_version != info->minor_version || | |
4274 | /* mddev->patch_version != info->patch_version || */ | |
4275 | mddev->ctime != info->ctime || | |
4276 | mddev->level != info->level || | |
4277 | /* mddev->layout != info->layout || */ | |
4278 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4279 | mddev->chunk_size != info->chunk_size || |
4280 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4281 | ((state^info->state) & 0xfffffe00) | |
4282 | ) | |
1da177e4 LT |
4283 | return -EINVAL; |
4284 | /* Check there is only one change */ | |
284ae7ca | 4285 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4286 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4287 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4288 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4289 | if (cnt == 0) return 0; |
4290 | if (cnt > 1) return -EINVAL; | |
4291 | ||
4292 | if (mddev->layout != info->layout) { | |
4293 | /* Change layout | |
4294 | * we don't need to do anything at the md level, the | |
4295 | * personality will take care of it all. | |
4296 | */ | |
4297 | if (mddev->pers->reconfig == NULL) | |
4298 | return -EINVAL; | |
4299 | else | |
4300 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4301 | } | |
284ae7ca | 4302 | if (info->size >= 0 && mddev->size != info->size) |
a35b0d69 N |
4303 | rv = update_size(mddev, info->size); |
4304 | ||
da943b99 N |
4305 | if (mddev->raid_disks != info->raid_disks) |
4306 | rv = update_raid_disks(mddev, info->raid_disks); | |
4307 | ||
36fa3063 N |
4308 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4309 | if (mddev->pers->quiesce == NULL) | |
4310 | return -EINVAL; | |
4311 | if (mddev->recovery || mddev->sync_thread) | |
4312 | return -EBUSY; | |
4313 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4314 | /* add the bitmap */ | |
4315 | if (mddev->bitmap) | |
4316 | return -EEXIST; | |
4317 | if (mddev->default_bitmap_offset == 0) | |
4318 | return -EINVAL; | |
4319 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4320 | mddev->pers->quiesce(mddev, 1); | |
4321 | rv = bitmap_create(mddev); | |
4322 | if (rv) | |
4323 | bitmap_destroy(mddev); | |
4324 | mddev->pers->quiesce(mddev, 0); | |
4325 | } else { | |
4326 | /* remove the bitmap */ | |
4327 | if (!mddev->bitmap) | |
4328 | return -ENOENT; | |
4329 | if (mddev->bitmap->file) | |
4330 | return -EINVAL; | |
4331 | mddev->pers->quiesce(mddev, 1); | |
4332 | bitmap_destroy(mddev); | |
4333 | mddev->pers->quiesce(mddev, 0); | |
4334 | mddev->bitmap_offset = 0; | |
4335 | } | |
4336 | } | |
850b2b42 | 4337 | md_update_sb(mddev, 1); |
1da177e4 LT |
4338 | return rv; |
4339 | } | |
4340 | ||
4341 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4342 | { | |
4343 | mdk_rdev_t *rdev; | |
4344 | ||
4345 | if (mddev->pers == NULL) | |
4346 | return -ENODEV; | |
4347 | ||
4348 | rdev = find_rdev(mddev, dev); | |
4349 | if (!rdev) | |
4350 | return -ENODEV; | |
4351 | ||
4352 | md_error(mddev, rdev); | |
4353 | return 0; | |
4354 | } | |
4355 | ||
a885c8c4 CH |
4356 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4357 | { | |
4358 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4359 | ||
4360 | geo->heads = 2; | |
4361 | geo->sectors = 4; | |
4362 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4363 | return 0; | |
4364 | } | |
4365 | ||
1da177e4 LT |
4366 | static int md_ioctl(struct inode *inode, struct file *file, |
4367 | unsigned int cmd, unsigned long arg) | |
4368 | { | |
4369 | int err = 0; | |
4370 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4371 | mddev_t *mddev = NULL; |
4372 | ||
4373 | if (!capable(CAP_SYS_ADMIN)) | |
4374 | return -EACCES; | |
4375 | ||
4376 | /* | |
4377 | * Commands dealing with the RAID driver but not any | |
4378 | * particular array: | |
4379 | */ | |
4380 | switch (cmd) | |
4381 | { | |
4382 | case RAID_VERSION: | |
4383 | err = get_version(argp); | |
4384 | goto done; | |
4385 | ||
4386 | case PRINT_RAID_DEBUG: | |
4387 | err = 0; | |
4388 | md_print_devices(); | |
4389 | goto done; | |
4390 | ||
4391 | #ifndef MODULE | |
4392 | case RAID_AUTORUN: | |
4393 | err = 0; | |
4394 | autostart_arrays(arg); | |
4395 | goto done; | |
4396 | #endif | |
4397 | default:; | |
4398 | } | |
4399 | ||
4400 | /* | |
4401 | * Commands creating/starting a new array: | |
4402 | */ | |
4403 | ||
4404 | mddev = inode->i_bdev->bd_disk->private_data; | |
4405 | ||
4406 | if (!mddev) { | |
4407 | BUG(); | |
4408 | goto abort; | |
4409 | } | |
4410 | ||
1da177e4 LT |
4411 | err = mddev_lock(mddev); |
4412 | if (err) { | |
4413 | printk(KERN_INFO | |
4414 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4415 | err, cmd); | |
4416 | goto abort; | |
4417 | } | |
4418 | ||
4419 | switch (cmd) | |
4420 | { | |
4421 | case SET_ARRAY_INFO: | |
4422 | { | |
4423 | mdu_array_info_t info; | |
4424 | if (!arg) | |
4425 | memset(&info, 0, sizeof(info)); | |
4426 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4427 | err = -EFAULT; | |
4428 | goto abort_unlock; | |
4429 | } | |
4430 | if (mddev->pers) { | |
4431 | err = update_array_info(mddev, &info); | |
4432 | if (err) { | |
4433 | printk(KERN_WARNING "md: couldn't update" | |
4434 | " array info. %d\n", err); | |
4435 | goto abort_unlock; | |
4436 | } | |
4437 | goto done_unlock; | |
4438 | } | |
4439 | if (!list_empty(&mddev->disks)) { | |
4440 | printk(KERN_WARNING | |
4441 | "md: array %s already has disks!\n", | |
4442 | mdname(mddev)); | |
4443 | err = -EBUSY; | |
4444 | goto abort_unlock; | |
4445 | } | |
4446 | if (mddev->raid_disks) { | |
4447 | printk(KERN_WARNING | |
4448 | "md: array %s already initialised!\n", | |
4449 | mdname(mddev)); | |
4450 | err = -EBUSY; | |
4451 | goto abort_unlock; | |
4452 | } | |
4453 | err = set_array_info(mddev, &info); | |
4454 | if (err) { | |
4455 | printk(KERN_WARNING "md: couldn't set" | |
4456 | " array info. %d\n", err); | |
4457 | goto abort_unlock; | |
4458 | } | |
4459 | } | |
4460 | goto done_unlock; | |
4461 | ||
4462 | default:; | |
4463 | } | |
4464 | ||
4465 | /* | |
4466 | * Commands querying/configuring an existing array: | |
4467 | */ | |
32a7627c | 4468 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 4469 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
32a7627c | 4470 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY |
3f9d7b0d N |
4471 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE |
4472 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
4473 | err = -ENODEV; |
4474 | goto abort_unlock; | |
4475 | } | |
4476 | ||
4477 | /* | |
4478 | * Commands even a read-only array can execute: | |
4479 | */ | |
4480 | switch (cmd) | |
4481 | { | |
4482 | case GET_ARRAY_INFO: | |
4483 | err = get_array_info(mddev, argp); | |
4484 | goto done_unlock; | |
4485 | ||
32a7627c | 4486 | case GET_BITMAP_FILE: |
87162a28 | 4487 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
4488 | goto done_unlock; |
4489 | ||
1da177e4 LT |
4490 | case GET_DISK_INFO: |
4491 | err = get_disk_info(mddev, argp); | |
4492 | goto done_unlock; | |
4493 | ||
4494 | case RESTART_ARRAY_RW: | |
4495 | err = restart_array(mddev); | |
4496 | goto done_unlock; | |
4497 | ||
4498 | case STOP_ARRAY: | |
4499 | err = do_md_stop (mddev, 0); | |
4500 | goto done_unlock; | |
4501 | ||
4502 | case STOP_ARRAY_RO: | |
4503 | err = do_md_stop (mddev, 1); | |
4504 | goto done_unlock; | |
4505 | ||
4506 | /* | |
4507 | * We have a problem here : there is no easy way to give a CHS | |
4508 | * virtual geometry. We currently pretend that we have a 2 heads | |
4509 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4510 | * dosfs just mad... ;-) | |
4511 | */ | |
1da177e4 LT |
4512 | } |
4513 | ||
4514 | /* | |
4515 | * The remaining ioctls are changing the state of the | |
f91de92e N |
4516 | * superblock, so we do not allow them on read-only arrays. |
4517 | * However non-MD ioctls (e.g. get-size) will still come through | |
4518 | * here and hit the 'default' below, so only disallow | |
4519 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 4520 | */ |
f91de92e N |
4521 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
4522 | mddev->ro && mddev->pers) { | |
4523 | if (mddev->ro == 2) { | |
4524 | mddev->ro = 0; | |
4525 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4526 | md_wakeup_thread(mddev->thread); | |
4527 | ||
4528 | } else { | |
4529 | err = -EROFS; | |
4530 | goto abort_unlock; | |
4531 | } | |
1da177e4 LT |
4532 | } |
4533 | ||
4534 | switch (cmd) | |
4535 | { | |
4536 | case ADD_NEW_DISK: | |
4537 | { | |
4538 | mdu_disk_info_t info; | |
4539 | if (copy_from_user(&info, argp, sizeof(info))) | |
4540 | err = -EFAULT; | |
4541 | else | |
4542 | err = add_new_disk(mddev, &info); | |
4543 | goto done_unlock; | |
4544 | } | |
4545 | ||
4546 | case HOT_REMOVE_DISK: | |
4547 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
4548 | goto done_unlock; | |
4549 | ||
4550 | case HOT_ADD_DISK: | |
4551 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
4552 | goto done_unlock; | |
4553 | ||
4554 | case SET_DISK_FAULTY: | |
4555 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
4556 | goto done_unlock; | |
4557 | ||
4558 | case RUN_ARRAY: | |
4559 | err = do_md_run (mddev); | |
4560 | goto done_unlock; | |
4561 | ||
32a7627c N |
4562 | case SET_BITMAP_FILE: |
4563 | err = set_bitmap_file(mddev, (int)arg); | |
4564 | goto done_unlock; | |
4565 | ||
1da177e4 | 4566 | default: |
1da177e4 LT |
4567 | err = -EINVAL; |
4568 | goto abort_unlock; | |
4569 | } | |
4570 | ||
4571 | done_unlock: | |
4572 | abort_unlock: | |
4573 | mddev_unlock(mddev); | |
4574 | ||
4575 | return err; | |
4576 | done: | |
4577 | if (err) | |
4578 | MD_BUG(); | |
4579 | abort: | |
4580 | return err; | |
4581 | } | |
4582 | ||
4583 | static int md_open(struct inode *inode, struct file *file) | |
4584 | { | |
4585 | /* | |
4586 | * Succeed if we can lock the mddev, which confirms that | |
4587 | * it isn't being stopped right now. | |
4588 | */ | |
4589 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4590 | int err; | |
4591 | ||
d63a5a74 | 4592 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
4593 | goto out; |
4594 | ||
4595 | err = 0; | |
4596 | mddev_get(mddev); | |
4597 | mddev_unlock(mddev); | |
4598 | ||
4599 | check_disk_change(inode->i_bdev); | |
4600 | out: | |
4601 | return err; | |
4602 | } | |
4603 | ||
4604 | static int md_release(struct inode *inode, struct file * file) | |
4605 | { | |
4606 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4607 | ||
52e5f9d1 | 4608 | BUG_ON(!mddev); |
1da177e4 LT |
4609 | mddev_put(mddev); |
4610 | ||
4611 | return 0; | |
4612 | } | |
4613 | ||
44ce6294 LT |
4614 | static int md_media_changed(struct gendisk *disk) |
4615 | { | |
4616 | mddev_t *mddev = disk->private_data; | |
4617 | ||
4618 | return mddev->changed; | |
4619 | } | |
4620 | ||
4621 | static int md_revalidate(struct gendisk *disk) | |
4622 | { | |
4623 | mddev_t *mddev = disk->private_data; | |
4624 | ||
4625 | mddev->changed = 0; | |
4626 | return 0; | |
4627 | } | |
1da177e4 LT |
4628 | static struct block_device_operations md_fops = |
4629 | { | |
4630 | .owner = THIS_MODULE, | |
4631 | .open = md_open, | |
4632 | .release = md_release, | |
4633 | .ioctl = md_ioctl, | |
a885c8c4 | 4634 | .getgeo = md_getgeo, |
44ce6294 LT |
4635 | .media_changed = md_media_changed, |
4636 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
4637 | }; |
4638 | ||
75c96f85 | 4639 | static int md_thread(void * arg) |
1da177e4 LT |
4640 | { |
4641 | mdk_thread_t *thread = arg; | |
4642 | ||
1da177e4 LT |
4643 | /* |
4644 | * md_thread is a 'system-thread', it's priority should be very | |
4645 | * high. We avoid resource deadlocks individually in each | |
4646 | * raid personality. (RAID5 does preallocation) We also use RR and | |
4647 | * the very same RT priority as kswapd, thus we will never get | |
4648 | * into a priority inversion deadlock. | |
4649 | * | |
4650 | * we definitely have to have equal or higher priority than | |
4651 | * bdflush, otherwise bdflush will deadlock if there are too | |
4652 | * many dirty RAID5 blocks. | |
4653 | */ | |
1da177e4 | 4654 | |
6985c43f | 4655 | allow_signal(SIGKILL); |
a6fb0934 | 4656 | while (!kthread_should_stop()) { |
1da177e4 | 4657 | |
93588e22 N |
4658 | /* We need to wait INTERRUPTIBLE so that |
4659 | * we don't add to the load-average. | |
4660 | * That means we need to be sure no signals are | |
4661 | * pending | |
4662 | */ | |
4663 | if (signal_pending(current)) | |
4664 | flush_signals(current); | |
4665 | ||
4666 | wait_event_interruptible_timeout | |
4667 | (thread->wqueue, | |
4668 | test_bit(THREAD_WAKEUP, &thread->flags) | |
4669 | || kthread_should_stop(), | |
4670 | thread->timeout); | |
1da177e4 LT |
4671 | |
4672 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
4673 | ||
787453c2 | 4674 | thread->run(thread->mddev); |
1da177e4 | 4675 | } |
a6fb0934 | 4676 | |
1da177e4 LT |
4677 | return 0; |
4678 | } | |
4679 | ||
4680 | void md_wakeup_thread(mdk_thread_t *thread) | |
4681 | { | |
4682 | if (thread) { | |
4683 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
4684 | set_bit(THREAD_WAKEUP, &thread->flags); | |
4685 | wake_up(&thread->wqueue); | |
4686 | } | |
4687 | } | |
4688 | ||
4689 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
4690 | const char *name) | |
4691 | { | |
4692 | mdk_thread_t *thread; | |
1da177e4 | 4693 | |
9ffae0cf | 4694 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
4695 | if (!thread) |
4696 | return NULL; | |
4697 | ||
1da177e4 LT |
4698 | init_waitqueue_head(&thread->wqueue); |
4699 | ||
1da177e4 LT |
4700 | thread->run = run; |
4701 | thread->mddev = mddev; | |
32a7627c | 4702 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 4703 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 4704 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
4705 | kfree(thread); |
4706 | return NULL; | |
4707 | } | |
1da177e4 LT |
4708 | return thread; |
4709 | } | |
4710 | ||
1da177e4 LT |
4711 | void md_unregister_thread(mdk_thread_t *thread) |
4712 | { | |
d28446fe | 4713 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
4714 | |
4715 | kthread_stop(thread->tsk); | |
1da177e4 LT |
4716 | kfree(thread); |
4717 | } | |
4718 | ||
4719 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
4720 | { | |
4721 | if (!mddev) { | |
4722 | MD_BUG(); | |
4723 | return; | |
4724 | } | |
4725 | ||
b2d444d7 | 4726 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4727 | return; |
32a7627c | 4728 | /* |
1da177e4 LT |
4729 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
4730 | mdname(mddev), | |
4731 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
4732 | __builtin_return_address(0),__builtin_return_address(1), | |
4733 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 4734 | */ |
d0a0a5ee AM |
4735 | if (!mddev->pers) |
4736 | return; | |
1da177e4 LT |
4737 | if (!mddev->pers->error_handler) |
4738 | return; | |
4739 | mddev->pers->error_handler(mddev,rdev); | |
4740 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4741 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4742 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 4743 | md_new_event_inintr(mddev); |
1da177e4 LT |
4744 | } |
4745 | ||
4746 | /* seq_file implementation /proc/mdstat */ | |
4747 | ||
4748 | static void status_unused(struct seq_file *seq) | |
4749 | { | |
4750 | int i = 0; | |
4751 | mdk_rdev_t *rdev; | |
4752 | struct list_head *tmp; | |
4753 | ||
4754 | seq_printf(seq, "unused devices: "); | |
4755 | ||
4756 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
4757 | char b[BDEVNAME_SIZE]; | |
4758 | i++; | |
4759 | seq_printf(seq, "%s ", | |
4760 | bdevname(rdev->bdev,b)); | |
4761 | } | |
4762 | if (!i) | |
4763 | seq_printf(seq, "<none>"); | |
4764 | ||
4765 | seq_printf(seq, "\n"); | |
4766 | } | |
4767 | ||
4768 | ||
4769 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
4770 | { | |
4588b42e N |
4771 | sector_t max_blocks, resync, res; |
4772 | unsigned long dt, db, rt; | |
4773 | int scale; | |
4774 | unsigned int per_milli; | |
1da177e4 LT |
4775 | |
4776 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
4777 | ||
4778 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4779 | max_blocks = mddev->resync_max_sectors >> 1; | |
4780 | else | |
4781 | max_blocks = mddev->size; | |
4782 | ||
4783 | /* | |
4784 | * Should not happen. | |
4785 | */ | |
4786 | if (!max_blocks) { | |
4787 | MD_BUG(); | |
4788 | return; | |
4789 | } | |
4588b42e N |
4790 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
4791 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
4792 | * u32, as those are the requirements for sector_div. | |
4793 | * Thus 'scale' must be at least 10 | |
4794 | */ | |
4795 | scale = 10; | |
4796 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
4797 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
4798 | scale++; | |
4799 | } | |
4800 | res = (resync>>scale)*1000; | |
4801 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
4802 | ||
4803 | per_milli = res; | |
1da177e4 | 4804 | { |
4588b42e | 4805 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
4806 | seq_printf(seq, "["); |
4807 | for (i = 0; i < x; i++) | |
4808 | seq_printf(seq, "="); | |
4809 | seq_printf(seq, ">"); | |
4810 | for (i = 0; i < y; i++) | |
4811 | seq_printf(seq, "."); | |
4812 | seq_printf(seq, "] "); | |
4813 | } | |
4588b42e | 4814 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
4815 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
4816 | "reshape" : | |
61df9d91 N |
4817 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
4818 | "check" : | |
4819 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
4820 | "resync" : "recovery"))), | |
4821 | per_milli/10, per_milli % 10, | |
4588b42e N |
4822 | (unsigned long long) resync, |
4823 | (unsigned long long) max_blocks); | |
1da177e4 LT |
4824 | |
4825 | /* | |
4826 | * We do not want to overflow, so the order of operands and | |
4827 | * the * 100 / 100 trick are important. We do a +1 to be | |
4828 | * safe against division by zero. We only estimate anyway. | |
4829 | * | |
4830 | * dt: time from mark until now | |
4831 | * db: blocks written from mark until now | |
4832 | * rt: remaining time | |
4833 | */ | |
4834 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
4835 | if (!dt) dt++; | |
ff4e8d9a N |
4836 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
4837 | - mddev->resync_mark_cnt; | |
4838 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
4839 | |
4840 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
4841 | ||
ff4e8d9a | 4842 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
4843 | } |
4844 | ||
4845 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
4846 | { | |
4847 | struct list_head *tmp; | |
4848 | loff_t l = *pos; | |
4849 | mddev_t *mddev; | |
4850 | ||
4851 | if (l >= 0x10000) | |
4852 | return NULL; | |
4853 | if (!l--) | |
4854 | /* header */ | |
4855 | return (void*)1; | |
4856 | ||
4857 | spin_lock(&all_mddevs_lock); | |
4858 | list_for_each(tmp,&all_mddevs) | |
4859 | if (!l--) { | |
4860 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
4861 | mddev_get(mddev); | |
4862 | spin_unlock(&all_mddevs_lock); | |
4863 | return mddev; | |
4864 | } | |
4865 | spin_unlock(&all_mddevs_lock); | |
4866 | if (!l--) | |
4867 | return (void*)2;/* tail */ | |
4868 | return NULL; | |
4869 | } | |
4870 | ||
4871 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4872 | { | |
4873 | struct list_head *tmp; | |
4874 | mddev_t *next_mddev, *mddev = v; | |
4875 | ||
4876 | ++*pos; | |
4877 | if (v == (void*)2) | |
4878 | return NULL; | |
4879 | ||
4880 | spin_lock(&all_mddevs_lock); | |
4881 | if (v == (void*)1) | |
4882 | tmp = all_mddevs.next; | |
4883 | else | |
4884 | tmp = mddev->all_mddevs.next; | |
4885 | if (tmp != &all_mddevs) | |
4886 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
4887 | else { | |
4888 | next_mddev = (void*)2; | |
4889 | *pos = 0x10000; | |
4890 | } | |
4891 | spin_unlock(&all_mddevs_lock); | |
4892 | ||
4893 | if (v != (void*)1) | |
4894 | mddev_put(mddev); | |
4895 | return next_mddev; | |
4896 | ||
4897 | } | |
4898 | ||
4899 | static void md_seq_stop(struct seq_file *seq, void *v) | |
4900 | { | |
4901 | mddev_t *mddev = v; | |
4902 | ||
4903 | if (mddev && v != (void*)1 && v != (void*)2) | |
4904 | mddev_put(mddev); | |
4905 | } | |
4906 | ||
d7603b7e N |
4907 | struct mdstat_info { |
4908 | int event; | |
4909 | }; | |
4910 | ||
1da177e4 LT |
4911 | static int md_seq_show(struct seq_file *seq, void *v) |
4912 | { | |
4913 | mddev_t *mddev = v; | |
4914 | sector_t size; | |
4915 | struct list_head *tmp2; | |
4916 | mdk_rdev_t *rdev; | |
d7603b7e | 4917 | struct mdstat_info *mi = seq->private; |
32a7627c | 4918 | struct bitmap *bitmap; |
1da177e4 LT |
4919 | |
4920 | if (v == (void*)1) { | |
2604b703 | 4921 | struct mdk_personality *pers; |
1da177e4 LT |
4922 | seq_printf(seq, "Personalities : "); |
4923 | spin_lock(&pers_lock); | |
2604b703 N |
4924 | list_for_each_entry(pers, &pers_list, list) |
4925 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
4926 | |
4927 | spin_unlock(&pers_lock); | |
4928 | seq_printf(seq, "\n"); | |
d7603b7e | 4929 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
4930 | return 0; |
4931 | } | |
4932 | if (v == (void*)2) { | |
4933 | status_unused(seq); | |
4934 | return 0; | |
4935 | } | |
4936 | ||
5dc5cf7d | 4937 | if (mddev_lock(mddev) < 0) |
1da177e4 | 4938 | return -EINTR; |
5dc5cf7d | 4939 | |
1da177e4 LT |
4940 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
4941 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
4942 | mddev->pers ? "" : "in"); | |
4943 | if (mddev->pers) { | |
f91de92e | 4944 | if (mddev->ro==1) |
1da177e4 | 4945 | seq_printf(seq, " (read-only)"); |
f91de92e N |
4946 | if (mddev->ro==2) |
4947 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
4948 | seq_printf(seq, " %s", mddev->pers->name); |
4949 | } | |
4950 | ||
4951 | size = 0; | |
4952 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
4953 | char b[BDEVNAME_SIZE]; | |
4954 | seq_printf(seq, " %s[%d]", | |
4955 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
4956 | if (test_bit(WriteMostly, &rdev->flags)) |
4957 | seq_printf(seq, "(W)"); | |
b2d444d7 | 4958 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4959 | seq_printf(seq, "(F)"); |
4960 | continue; | |
b325a32e N |
4961 | } else if (rdev->raid_disk < 0) |
4962 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
4963 | size += rdev->size; |
4964 | } | |
4965 | ||
4966 | if (!list_empty(&mddev->disks)) { | |
4967 | if (mddev->pers) | |
4968 | seq_printf(seq, "\n %llu blocks", | |
4969 | (unsigned long long)mddev->array_size); | |
4970 | else | |
4971 | seq_printf(seq, "\n %llu blocks", | |
4972 | (unsigned long long)size); | |
4973 | } | |
1cd6bf19 N |
4974 | if (mddev->persistent) { |
4975 | if (mddev->major_version != 0 || | |
4976 | mddev->minor_version != 90) { | |
4977 | seq_printf(seq," super %d.%d", | |
4978 | mddev->major_version, | |
4979 | mddev->minor_version); | |
4980 | } | |
4981 | } else | |
4982 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
4983 | |
4984 | if (mddev->pers) { | |
4985 | mddev->pers->status (seq, mddev); | |
4986 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
4987 | if (mddev->pers->sync_request) { |
4988 | if (mddev->curr_resync > 2) { | |
4989 | status_resync (seq, mddev); | |
4990 | seq_printf(seq, "\n "); | |
4991 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
4992 | seq_printf(seq, "\tresync=DELAYED\n "); | |
4993 | else if (mddev->recovery_cp < MaxSector) | |
4994 | seq_printf(seq, "\tresync=PENDING\n "); | |
4995 | } | |
32a7627c N |
4996 | } else |
4997 | seq_printf(seq, "\n "); | |
4998 | ||
4999 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5000 | unsigned long chunk_kb; |
5001 | unsigned long flags; | |
32a7627c N |
5002 | spin_lock_irqsave(&bitmap->lock, flags); |
5003 | chunk_kb = bitmap->chunksize >> 10; | |
5004 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5005 | "%lu%s chunk", | |
5006 | bitmap->pages - bitmap->missing_pages, | |
5007 | bitmap->pages, | |
5008 | (bitmap->pages - bitmap->missing_pages) | |
5009 | << (PAGE_SHIFT - 10), | |
5010 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5011 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5012 | if (bitmap->file) { |
5013 | seq_printf(seq, ", file: "); | |
c649bb9c JS |
5014 | seq_path(seq, bitmap->file->f_path.mnt, |
5015 | bitmap->file->f_path.dentry," \t\n"); | |
32a7627c | 5016 | } |
78d742d8 | 5017 | |
32a7627c N |
5018 | seq_printf(seq, "\n"); |
5019 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5020 | } |
5021 | ||
5022 | seq_printf(seq, "\n"); | |
5023 | } | |
5024 | mddev_unlock(mddev); | |
5025 | ||
5026 | return 0; | |
5027 | } | |
5028 | ||
5029 | static struct seq_operations md_seq_ops = { | |
5030 | .start = md_seq_start, | |
5031 | .next = md_seq_next, | |
5032 | .stop = md_seq_stop, | |
5033 | .show = md_seq_show, | |
5034 | }; | |
5035 | ||
5036 | static int md_seq_open(struct inode *inode, struct file *file) | |
5037 | { | |
5038 | int error; | |
d7603b7e N |
5039 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5040 | if (mi == NULL) | |
5041 | return -ENOMEM; | |
1da177e4 LT |
5042 | |
5043 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5044 | if (error) |
5045 | kfree(mi); | |
5046 | else { | |
5047 | struct seq_file *p = file->private_data; | |
5048 | p->private = mi; | |
5049 | mi->event = atomic_read(&md_event_count); | |
5050 | } | |
1da177e4 LT |
5051 | return error; |
5052 | } | |
5053 | ||
d7603b7e N |
5054 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5055 | { | |
5056 | struct seq_file *m = filp->private_data; | |
5057 | struct mdstat_info *mi = m->private; | |
5058 | int mask; | |
5059 | ||
5060 | poll_wait(filp, &md_event_waiters, wait); | |
5061 | ||
5062 | /* always allow read */ | |
5063 | mask = POLLIN | POLLRDNORM; | |
5064 | ||
5065 | if (mi->event != atomic_read(&md_event_count)) | |
5066 | mask |= POLLERR | POLLPRI; | |
5067 | return mask; | |
5068 | } | |
5069 | ||
fa027c2a | 5070 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5071 | .owner = THIS_MODULE, |
1da177e4 LT |
5072 | .open = md_seq_open, |
5073 | .read = seq_read, | |
5074 | .llseek = seq_lseek, | |
c3f94b40 | 5075 | .release = seq_release_private, |
d7603b7e | 5076 | .poll = mdstat_poll, |
1da177e4 LT |
5077 | }; |
5078 | ||
2604b703 | 5079 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5080 | { |
1da177e4 | 5081 | spin_lock(&pers_lock); |
2604b703 N |
5082 | list_add_tail(&p->list, &pers_list); |
5083 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5084 | spin_unlock(&pers_lock); |
5085 | return 0; | |
5086 | } | |
5087 | ||
2604b703 | 5088 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5089 | { |
2604b703 | 5090 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5091 | spin_lock(&pers_lock); |
2604b703 | 5092 | list_del_init(&p->list); |
1da177e4 LT |
5093 | spin_unlock(&pers_lock); |
5094 | return 0; | |
5095 | } | |
5096 | ||
5097 | static int is_mddev_idle(mddev_t *mddev) | |
5098 | { | |
5099 | mdk_rdev_t * rdev; | |
5100 | struct list_head *tmp; | |
5101 | int idle; | |
713f6ab1 | 5102 | long curr_events; |
1da177e4 LT |
5103 | |
5104 | idle = 1; | |
5105 | ITERATE_RDEV(mddev,rdev,tmp) { | |
5106 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
5107 | curr_events = disk_stat_read(disk, sectors[0]) + |
5108 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 5109 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5110 | /* sync IO will cause sync_io to increase before the disk_stats |
5111 | * as sync_io is counted when a request starts, and | |
5112 | * disk_stats is counted when it completes. | |
5113 | * So resync activity will cause curr_events to be smaller than | |
5114 | * when there was no such activity. | |
5115 | * non-sync IO will cause disk_stat to increase without | |
5116 | * increasing sync_io so curr_events will (eventually) | |
5117 | * be larger than it was before. Once it becomes | |
5118 | * substantially larger, the test below will cause | |
5119 | * the array to appear non-idle, and resync will slow | |
5120 | * down. | |
5121 | * If there is a lot of outstanding resync activity when | |
5122 | * we set last_event to curr_events, then all that activity | |
5123 | * completing might cause the array to appear non-idle | |
5124 | * and resync will be slowed down even though there might | |
5125 | * not have been non-resync activity. This will only | |
5126 | * happen once though. 'last_events' will soon reflect | |
5127 | * the state where there is little or no outstanding | |
5128 | * resync requests, and further resync activity will | |
5129 | * always make curr_events less than last_events. | |
c0e48521 | 5130 | * |
1da177e4 | 5131 | */ |
713f6ab1 | 5132 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5133 | rdev->last_events = curr_events; |
5134 | idle = 0; | |
5135 | } | |
5136 | } | |
5137 | return idle; | |
5138 | } | |
5139 | ||
5140 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5141 | { | |
5142 | /* another "blocks" (512byte) blocks have been synced */ | |
5143 | atomic_sub(blocks, &mddev->recovery_active); | |
5144 | wake_up(&mddev->recovery_wait); | |
5145 | if (!ok) { | |
5146 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5147 | md_wakeup_thread(mddev->thread); | |
5148 | // stop recovery, signal do_sync .... | |
5149 | } | |
5150 | } | |
5151 | ||
5152 | ||
06d91a5f N |
5153 | /* md_write_start(mddev, bi) |
5154 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5155 | * in superblock) before writing, schedule a superblock update |
5156 | * and wait for it to complete. | |
06d91a5f | 5157 | */ |
3d310eb7 | 5158 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5159 | { |
06d91a5f | 5160 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5161 | return; |
06d91a5f | 5162 | |
f91de92e N |
5163 | BUG_ON(mddev->ro == 1); |
5164 | if (mddev->ro == 2) { | |
5165 | /* need to switch to read/write */ | |
5166 | mddev->ro = 0; | |
5167 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5168 | md_wakeup_thread(mddev->thread); | |
5169 | } | |
06d91a5f | 5170 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 5171 | if (mddev->in_sync) { |
a9701a30 | 5172 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5173 | if (mddev->in_sync) { |
5174 | mddev->in_sync = 0; | |
850b2b42 | 5175 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 N |
5176 | md_wakeup_thread(mddev->thread); |
5177 | } | |
a9701a30 | 5178 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5179 | } |
850b2b42 | 5180 | wait_event(mddev->sb_wait, mddev->flags==0); |
1da177e4 LT |
5181 | } |
5182 | ||
5183 | void md_write_end(mddev_t *mddev) | |
5184 | { | |
5185 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5186 | if (mddev->safemode == 2) | |
5187 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5188 | else if (mddev->safemode_delay) |
1da177e4 LT |
5189 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5190 | } | |
5191 | } | |
5192 | ||
2a2275d6 N |
5193 | /* md_allow_write(mddev) |
5194 | * Calling this ensures that the array is marked 'active' so that writes | |
5195 | * may proceed without blocking. It is important to call this before | |
5196 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5197 | * Must be called with mddev_lock held. | |
5198 | */ | |
5199 | void md_allow_write(mddev_t *mddev) | |
5200 | { | |
5201 | if (!mddev->pers) | |
5202 | return; | |
5203 | if (mddev->ro) | |
5204 | return; | |
5205 | ||
5206 | spin_lock_irq(&mddev->write_lock); | |
5207 | if (mddev->in_sync) { | |
5208 | mddev->in_sync = 0; | |
5209 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5210 | if (mddev->safemode_delay && | |
5211 | mddev->safemode == 0) | |
5212 | mddev->safemode = 1; | |
5213 | spin_unlock_irq(&mddev->write_lock); | |
5214 | md_update_sb(mddev, 0); | |
5215 | } else | |
5216 | spin_unlock_irq(&mddev->write_lock); | |
5217 | } | |
5218 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5219 | ||
75c96f85 | 5220 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
5221 | |
5222 | #define SYNC_MARKS 10 | |
5223 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5224 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5225 | { |
5226 | mddev_t *mddev2; | |
5227 | unsigned int currspeed = 0, | |
5228 | window; | |
57afd89f | 5229 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5230 | unsigned long mark[SYNC_MARKS]; |
5231 | sector_t mark_cnt[SYNC_MARKS]; | |
5232 | int last_mark,m; | |
5233 | struct list_head *tmp; | |
5234 | sector_t last_check; | |
57afd89f | 5235 | int skipped = 0; |
5fd6c1dc N |
5236 | struct list_head *rtmp; |
5237 | mdk_rdev_t *rdev; | |
61df9d91 | 5238 | char *desc; |
1da177e4 LT |
5239 | |
5240 | /* just incase thread restarts... */ | |
5241 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5242 | return; | |
5fd6c1dc N |
5243 | if (mddev->ro) /* never try to sync a read-only array */ |
5244 | return; | |
1da177e4 | 5245 | |
61df9d91 N |
5246 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5247 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5248 | desc = "data-check"; | |
5249 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5250 | desc = "requested-resync"; | |
5251 | else | |
5252 | desc = "resync"; | |
5253 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5254 | desc = "reshape"; | |
5255 | else | |
5256 | desc = "recovery"; | |
5257 | ||
1da177e4 LT |
5258 | /* we overload curr_resync somewhat here. |
5259 | * 0 == not engaged in resync at all | |
5260 | * 2 == checking that there is no conflict with another sync | |
5261 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5262 | * commense | |
5263 | * other == active in resync - this many blocks | |
5264 | * | |
5265 | * Before starting a resync we must have set curr_resync to | |
5266 | * 2, and then checked that every "conflicting" array has curr_resync | |
5267 | * less than ours. When we find one that is the same or higher | |
5268 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5269 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5270 | * This will mean we have to start checking from the beginning again. | |
5271 | * | |
5272 | */ | |
5273 | ||
5274 | do { | |
5275 | mddev->curr_resync = 2; | |
5276 | ||
5277 | try_again: | |
787453c2 | 5278 | if (kthread_should_stop()) { |
6985c43f | 5279 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5280 | goto skip; |
5281 | } | |
5282 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
5283 | if (mddev2 == mddev) |
5284 | continue; | |
5285 | if (mddev2->curr_resync && | |
5286 | match_mddev_units(mddev,mddev2)) { | |
5287 | DEFINE_WAIT(wq); | |
5288 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5289 | /* arbitrarily yield */ | |
5290 | mddev->curr_resync = 1; | |
5291 | wake_up(&resync_wait); | |
5292 | } | |
5293 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5294 | /* no need to wait here, we can wait the next | |
5295 | * time 'round when curr_resync == 2 | |
5296 | */ | |
5297 | continue; | |
787453c2 N |
5298 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
5299 | if (!kthread_should_stop() && | |
8712e553 | 5300 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5301 | printk(KERN_INFO "md: delaying %s of %s" |
5302 | " until %s has finished (they" | |
1da177e4 | 5303 | " share one or more physical units)\n", |
61df9d91 | 5304 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 LT |
5305 | mddev_put(mddev2); |
5306 | schedule(); | |
5307 | finish_wait(&resync_wait, &wq); | |
5308 | goto try_again; | |
5309 | } | |
5310 | finish_wait(&resync_wait, &wq); | |
5311 | } | |
5312 | } | |
5313 | } while (mddev->curr_resync < 2); | |
5314 | ||
5fd6c1dc | 5315 | j = 0; |
9d88883e | 5316 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5317 | /* resync follows the size requested by the personality, |
57afd89f | 5318 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5319 | */ |
5320 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5321 | mddev->resync_mismatches = 0; |
5fd6c1dc N |
5322 | /* we don't use the checkpoint if there's a bitmap */ |
5323 | if (!mddev->bitmap && | |
5324 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5325 | j = mddev->recovery_cp; | |
ccfcc3c1 N |
5326 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5327 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5328 | else { |
1da177e4 LT |
5329 | /* recovery follows the physical size of devices */ |
5330 | max_sectors = mddev->size << 1; | |
5fd6c1dc N |
5331 | j = MaxSector; |
5332 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5333 | if (rdev->raid_disk >= 0 && | |
5334 | !test_bit(Faulty, &rdev->flags) && | |
5335 | !test_bit(In_sync, &rdev->flags) && | |
5336 | rdev->recovery_offset < j) | |
5337 | j = rdev->recovery_offset; | |
5338 | } | |
1da177e4 | 5339 | |
61df9d91 N |
5340 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5341 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5342 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5343 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5344 | "(but not more than %d KB/sec) for %s.\n", |
5345 | speed_max(mddev), desc); | |
1da177e4 LT |
5346 | |
5347 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5348 | |
57afd89f | 5349 | io_sectors = 0; |
1da177e4 LT |
5350 | for (m = 0; m < SYNC_MARKS; m++) { |
5351 | mark[m] = jiffies; | |
57afd89f | 5352 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5353 | } |
5354 | last_mark = 0; | |
5355 | mddev->resync_mark = mark[last_mark]; | |
5356 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
5357 | ||
5358 | /* | |
5359 | * Tune reconstruction: | |
5360 | */ | |
5361 | window = 32*(PAGE_SIZE/512); | |
5362 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
5363 | window/2,(unsigned long long) max_sectors/2); | |
5364 | ||
5365 | atomic_set(&mddev->recovery_active, 0); | |
5366 | init_waitqueue_head(&mddev->recovery_wait); | |
5367 | last_check = 0; | |
5368 | ||
5369 | if (j>2) { | |
5370 | printk(KERN_INFO | |
61df9d91 N |
5371 | "md: resuming %s of %s from checkpoint.\n", |
5372 | desc, mdname(mddev)); | |
1da177e4 LT |
5373 | mddev->curr_resync = j; |
5374 | } | |
5375 | ||
5376 | while (j < max_sectors) { | |
57afd89f | 5377 | sector_t sectors; |
1da177e4 | 5378 | |
57afd89f N |
5379 | skipped = 0; |
5380 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
88202a0c | 5381 | currspeed < speed_min(mddev)); |
57afd89f | 5382 | if (sectors == 0) { |
1da177e4 LT |
5383 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
5384 | goto out; | |
5385 | } | |
57afd89f N |
5386 | |
5387 | if (!skipped) { /* actual IO requested */ | |
5388 | io_sectors += sectors; | |
5389 | atomic_add(sectors, &mddev->recovery_active); | |
5390 | } | |
5391 | ||
1da177e4 LT |
5392 | j += sectors; |
5393 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 5394 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
5395 | if (last_check == 0) |
5396 | /* this is the earliers that rebuilt will be | |
5397 | * visible in /proc/mdstat | |
5398 | */ | |
5399 | md_new_event(mddev); | |
57afd89f N |
5400 | |
5401 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
5402 | continue; |
5403 | ||
57afd89f | 5404 | last_check = io_sectors; |
1da177e4 LT |
5405 | |
5406 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
5407 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
5408 | break; | |
5409 | ||
5410 | repeat: | |
5411 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
5412 | /* step marks */ | |
5413 | int next = (last_mark+1) % SYNC_MARKS; | |
5414 | ||
5415 | mddev->resync_mark = mark[next]; | |
5416 | mddev->resync_mark_cnt = mark_cnt[next]; | |
5417 | mark[next] = jiffies; | |
57afd89f | 5418 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5419 | last_mark = next; |
5420 | } | |
5421 | ||
5422 | ||
787453c2 | 5423 | if (kthread_should_stop()) { |
1da177e4 LT |
5424 | /* |
5425 | * got a signal, exit. | |
5426 | */ | |
5427 | printk(KERN_INFO | |
5428 | "md: md_do_sync() got signal ... exiting\n"); | |
1da177e4 LT |
5429 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5430 | goto out; | |
5431 | } | |
5432 | ||
5433 | /* | |
5434 | * this loop exits only if either when we are slower than | |
5435 | * the 'hard' speed limit, or the system was IO-idle for | |
5436 | * a jiffy. | |
5437 | * the system might be non-idle CPU-wise, but we only care | |
5438 | * about not overloading the IO subsystem. (things like an | |
5439 | * e2fsck being done on the RAID array should execute fast) | |
5440 | */ | |
5441 | mddev->queue->unplug_fn(mddev->queue); | |
5442 | cond_resched(); | |
5443 | ||
57afd89f N |
5444 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
5445 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 5446 | |
88202a0c N |
5447 | if (currspeed > speed_min(mddev)) { |
5448 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 5449 | !is_mddev_idle(mddev)) { |
c0e48521 | 5450 | msleep(500); |
1da177e4 LT |
5451 | goto repeat; |
5452 | } | |
5453 | } | |
5454 | } | |
61df9d91 | 5455 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
5456 | /* |
5457 | * this also signals 'finished resyncing' to md_stop | |
5458 | */ | |
5459 | out: | |
5460 | mddev->queue->unplug_fn(mddev->queue); | |
5461 | ||
5462 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
5463 | ||
5464 | /* tell personality that we are finished */ | |
57afd89f | 5465 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
5466 | |
5467 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
ccfcc3c1 | 5468 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
5469 | mddev->curr_resync > 2) { |
5470 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
5471 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5472 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
5473 | printk(KERN_INFO | |
61df9d91 N |
5474 | "md: checkpointing %s of %s.\n", |
5475 | desc, mdname(mddev)); | |
5fd6c1dc N |
5476 | mddev->recovery_cp = mddev->curr_resync; |
5477 | } | |
5478 | } else | |
5479 | mddev->recovery_cp = MaxSector; | |
5480 | } else { | |
5481 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5482 | mddev->curr_resync = MaxSector; | |
5483 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5484 | if (rdev->raid_disk >= 0 && | |
5485 | !test_bit(Faulty, &rdev->flags) && | |
5486 | !test_bit(In_sync, &rdev->flags) && | |
5487 | rdev->recovery_offset < mddev->curr_resync) | |
5488 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 5489 | } |
1da177e4 | 5490 | } |
17571284 | 5491 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5492 | |
1da177e4 LT |
5493 | skip: |
5494 | mddev->curr_resync = 0; | |
5495 | wake_up(&resync_wait); | |
5496 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
5497 | md_wakeup_thread(mddev->thread); | |
5498 | } | |
29269553 | 5499 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
5500 | |
5501 | ||
b4c4c7b8 N |
5502 | static int remove_and_add_spares(mddev_t *mddev) |
5503 | { | |
5504 | mdk_rdev_t *rdev; | |
5505 | struct list_head *rtmp; | |
5506 | int spares = 0; | |
5507 | ||
5508 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5509 | if (rdev->raid_disk >= 0 && | |
5510 | (test_bit(Faulty, &rdev->flags) || | |
5511 | ! test_bit(In_sync, &rdev->flags)) && | |
5512 | atomic_read(&rdev->nr_pending)==0) { | |
5513 | if (mddev->pers->hot_remove_disk( | |
5514 | mddev, rdev->raid_disk)==0) { | |
5515 | char nm[20]; | |
5516 | sprintf(nm,"rd%d", rdev->raid_disk); | |
5517 | sysfs_remove_link(&mddev->kobj, nm); | |
5518 | rdev->raid_disk = -1; | |
5519 | } | |
5520 | } | |
5521 | ||
5522 | if (mddev->degraded) { | |
5523 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5524 | if (rdev->raid_disk < 0 | |
5525 | && !test_bit(Faulty, &rdev->flags)) { | |
5526 | rdev->recovery_offset = 0; | |
5527 | if (mddev->pers->hot_add_disk(mddev,rdev)) { | |
5528 | char nm[20]; | |
5529 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
5530 | if (sysfs_create_link(&mddev->kobj, |
5531 | &rdev->kobj, nm)) | |
5532 | printk(KERN_WARNING | |
5533 | "md: cannot register " | |
5534 | "%s for %s\n", | |
5535 | nm, mdname(mddev)); | |
b4c4c7b8 N |
5536 | spares++; |
5537 | md_new_event(mddev); | |
5538 | } else | |
5539 | break; | |
5540 | } | |
5541 | } | |
5542 | return spares; | |
5543 | } | |
1da177e4 LT |
5544 | /* |
5545 | * This routine is regularly called by all per-raid-array threads to | |
5546 | * deal with generic issues like resync and super-block update. | |
5547 | * Raid personalities that don't have a thread (linear/raid0) do not | |
5548 | * need this as they never do any recovery or update the superblock. | |
5549 | * | |
5550 | * It does not do any resync itself, but rather "forks" off other threads | |
5551 | * to do that as needed. | |
5552 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
5553 | * "->recovery" and create a thread at ->sync_thread. | |
5554 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
5555 | * and wakeups up this thread which will reap the thread and finish up. | |
5556 | * This thread also removes any faulty devices (with nr_pending == 0). | |
5557 | * | |
5558 | * The overall approach is: | |
5559 | * 1/ if the superblock needs updating, update it. | |
5560 | * 2/ If a recovery thread is running, don't do anything else. | |
5561 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
5562 | * 4/ If there are any faulty devices, remove them. | |
5563 | * 5/ If array is degraded, try to add spares devices | |
5564 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
5565 | */ | |
5566 | void md_check_recovery(mddev_t *mddev) | |
5567 | { | |
5568 | mdk_rdev_t *rdev; | |
5569 | struct list_head *rtmp; | |
5570 | ||
5571 | ||
5f40402d N |
5572 | if (mddev->bitmap) |
5573 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
5574 | |
5575 | if (mddev->ro) | |
5576 | return; | |
fca4d848 N |
5577 | |
5578 | if (signal_pending(current)) { | |
5579 | if (mddev->pers->sync_request) { | |
5580 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
5581 | mdname(mddev)); | |
5582 | mddev->safemode = 2; | |
5583 | } | |
5584 | flush_signals(current); | |
5585 | } | |
5586 | ||
1da177e4 | 5587 | if ( ! ( |
850b2b42 | 5588 | mddev->flags || |
1da177e4 | 5589 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 N |
5590 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
5591 | (mddev->safemode == 1) || | |
5592 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
5593 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
5594 | )) |
5595 | return; | |
fca4d848 | 5596 | |
df5b89b3 | 5597 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 5598 | int spares = 0; |
fca4d848 | 5599 | |
a9701a30 | 5600 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
5601 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
5602 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
5603 | mddev->in_sync = 1; | |
850b2b42 | 5604 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
fca4d848 N |
5605 | } |
5606 | if (mddev->safemode == 1) | |
5607 | mddev->safemode = 0; | |
a9701a30 | 5608 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 5609 | |
850b2b42 N |
5610 | if (mddev->flags) |
5611 | md_update_sb(mddev, 0); | |
06d91a5f | 5612 | |
06d91a5f | 5613 | |
1da177e4 LT |
5614 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
5615 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
5616 | /* resync/recovery still happening */ | |
5617 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5618 | goto unlock; | |
5619 | } | |
5620 | if (mddev->sync_thread) { | |
5621 | /* resync has finished, collect result */ | |
5622 | md_unregister_thread(mddev->sync_thread); | |
5623 | mddev->sync_thread = NULL; | |
5624 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
5625 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5626 | /* success...*/ | |
5627 | /* activate any spares */ | |
5628 | mddev->pers->spare_active(mddev); | |
5629 | } | |
850b2b42 | 5630 | md_update_sb(mddev, 1); |
41158c7e N |
5631 | |
5632 | /* if array is no-longer degraded, then any saved_raid_disk | |
5633 | * information must be scrapped | |
5634 | */ | |
5635 | if (!mddev->degraded) | |
5636 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5637 | rdev->saved_raid_disk = -1; | |
5638 | ||
1da177e4 LT |
5639 | mddev->recovery = 0; |
5640 | /* flag recovery needed just to double check */ | |
5641 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 5642 | md_new_event(mddev); |
1da177e4 LT |
5643 | goto unlock; |
5644 | } | |
24dd469d N |
5645 | /* Clear some bits that don't mean anything, but |
5646 | * might be left set | |
5647 | */ | |
5648 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5649 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5650 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5651 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 5652 | |
5fd6c1dc N |
5653 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
5654 | goto unlock; | |
1da177e4 LT |
5655 | /* no recovery is running. |
5656 | * remove any failed drives, then | |
5657 | * add spares if possible. | |
5658 | * Spare are also removed and re-added, to allow | |
5659 | * the personality to fail the re-add. | |
5660 | */ | |
1da177e4 | 5661 | |
b4c4c7b8 N |
5662 | if (mddev->reshape_position != MaxSector) { |
5663 | if (mddev->pers->check_reshape(mddev) != 0) | |
5664 | /* Cannot proceed */ | |
5665 | goto unlock; | |
5666 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
5667 | } else if ((spares = remove_and_add_spares(mddev))) { | |
24dd469d N |
5668 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
5669 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5670 | } else if (mddev->recovery_cp < MaxSector) { | |
5671 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
5672 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5673 | /* nothing to be done ... */ | |
1da177e4 | 5674 | goto unlock; |
24dd469d | 5675 | |
1da177e4 LT |
5676 | if (mddev->pers->sync_request) { |
5677 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
5678 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
5679 | /* We are adding a device or devices to an array | |
5680 | * which has the bitmap stored on all devices. | |
5681 | * So make sure all bitmap pages get written | |
5682 | */ | |
5683 | bitmap_write_all(mddev->bitmap); | |
5684 | } | |
1da177e4 LT |
5685 | mddev->sync_thread = md_register_thread(md_do_sync, |
5686 | mddev, | |
5687 | "%s_resync"); | |
5688 | if (!mddev->sync_thread) { | |
5689 | printk(KERN_ERR "%s: could not start resync" | |
5690 | " thread...\n", | |
5691 | mdname(mddev)); | |
5692 | /* leave the spares where they are, it shouldn't hurt */ | |
5693 | mddev->recovery = 0; | |
d7603b7e | 5694 | } else |
1da177e4 | 5695 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 5696 | md_new_event(mddev); |
1da177e4 LT |
5697 | } |
5698 | unlock: | |
5699 | mddev_unlock(mddev); | |
5700 | } | |
5701 | } | |
5702 | ||
75c96f85 AB |
5703 | static int md_notify_reboot(struct notifier_block *this, |
5704 | unsigned long code, void *x) | |
1da177e4 LT |
5705 | { |
5706 | struct list_head *tmp; | |
5707 | mddev_t *mddev; | |
5708 | ||
5709 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
5710 | ||
5711 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
5712 | ||
5713 | ITERATE_MDDEV(mddev,tmp) | |
c71d4887 | 5714 | if (mddev_trylock(mddev)) { |
1da177e4 | 5715 | do_md_stop (mddev, 1); |
c71d4887 NB |
5716 | mddev_unlock(mddev); |
5717 | } | |
1da177e4 LT |
5718 | /* |
5719 | * certain more exotic SCSI devices are known to be | |
5720 | * volatile wrt too early system reboots. While the | |
5721 | * right place to handle this issue is the given | |
5722 | * driver, we do want to have a safe RAID driver ... | |
5723 | */ | |
5724 | mdelay(1000*1); | |
5725 | } | |
5726 | return NOTIFY_DONE; | |
5727 | } | |
5728 | ||
75c96f85 | 5729 | static struct notifier_block md_notifier = { |
1da177e4 LT |
5730 | .notifier_call = md_notify_reboot, |
5731 | .next = NULL, | |
5732 | .priority = INT_MAX, /* before any real devices */ | |
5733 | }; | |
5734 | ||
5735 | static void md_geninit(void) | |
5736 | { | |
5737 | struct proc_dir_entry *p; | |
5738 | ||
5739 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
5740 | ||
5741 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
5742 | if (p) | |
5743 | p->proc_fops = &md_seq_fops; | |
5744 | } | |
5745 | ||
75c96f85 | 5746 | static int __init md_init(void) |
1da177e4 | 5747 | { |
1da177e4 LT |
5748 | if (register_blkdev(MAJOR_NR, "md")) |
5749 | return -1; | |
5750 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
5751 | unregister_blkdev(MAJOR_NR, "md"); | |
5752 | return -1; | |
5753 | } | |
e8703fe1 N |
5754 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
5755 | md_probe, NULL, NULL); | |
5756 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
5757 | md_probe, NULL, NULL); |
5758 | ||
1da177e4 | 5759 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 5760 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
5761 | |
5762 | md_geninit(); | |
5763 | return (0); | |
5764 | } | |
5765 | ||
5766 | ||
5767 | #ifndef MODULE | |
5768 | ||
5769 | /* | |
5770 | * Searches all registered partitions for autorun RAID arrays | |
5771 | * at boot time. | |
5772 | */ | |
4d936ec1 ME |
5773 | |
5774 | static LIST_HEAD(all_detected_devices); | |
5775 | struct detected_devices_node { | |
5776 | struct list_head list; | |
5777 | dev_t dev; | |
5778 | }; | |
1da177e4 LT |
5779 | |
5780 | void md_autodetect_dev(dev_t dev) | |
5781 | { | |
4d936ec1 ME |
5782 | struct detected_devices_node *node_detected_dev; |
5783 | ||
5784 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
5785 | if (node_detected_dev) { | |
5786 | node_detected_dev->dev = dev; | |
5787 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
5788 | } else { | |
5789 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
5790 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
5791 | } | |
1da177e4 LT |
5792 | } |
5793 | ||
5794 | ||
5795 | static void autostart_arrays(int part) | |
5796 | { | |
5797 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
5798 | struct detected_devices_node *node_detected_dev; |
5799 | dev_t dev; | |
5800 | int i_scanned, i_passed; | |
1da177e4 | 5801 | |
4d936ec1 ME |
5802 | i_scanned = 0; |
5803 | i_passed = 0; | |
1da177e4 | 5804 | |
4d936ec1 | 5805 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 5806 | |
4d936ec1 ME |
5807 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
5808 | i_scanned++; | |
5809 | node_detected_dev = list_entry(all_detected_devices.next, | |
5810 | struct detected_devices_node, list); | |
5811 | list_del(&node_detected_dev->list); | |
5812 | dev = node_detected_dev->dev; | |
5813 | kfree(node_detected_dev); | |
df968c4e | 5814 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
5815 | if (IS_ERR(rdev)) |
5816 | continue; | |
5817 | ||
b2d444d7 | 5818 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5819 | MD_BUG(); |
5820 | continue; | |
5821 | } | |
5822 | list_add(&rdev->same_set, &pending_raid_disks); | |
4d936ec1 | 5823 | i_passed++; |
1da177e4 | 5824 | } |
4d936ec1 ME |
5825 | |
5826 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
5827 | i_scanned, i_passed); | |
1da177e4 LT |
5828 | |
5829 | autorun_devices(part); | |
5830 | } | |
5831 | ||
fdee8ae4 | 5832 | #endif /* !MODULE */ |
1da177e4 LT |
5833 | |
5834 | static __exit void md_exit(void) | |
5835 | { | |
5836 | mddev_t *mddev; | |
5837 | struct list_head *tmp; | |
8ab5e4c1 | 5838 | |
e8703fe1 N |
5839 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
5840 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
5841 | |
5842 | unregister_blkdev(MAJOR_NR,"md"); | |
5843 | unregister_blkdev(mdp_major, "mdp"); | |
5844 | unregister_reboot_notifier(&md_notifier); | |
5845 | unregister_sysctl_table(raid_table_header); | |
5846 | remove_proc_entry("mdstat", NULL); | |
5847 | ITERATE_MDDEV(mddev,tmp) { | |
5848 | struct gendisk *disk = mddev->gendisk; | |
5849 | if (!disk) | |
5850 | continue; | |
5851 | export_array(mddev); | |
5852 | del_gendisk(disk); | |
5853 | put_disk(disk); | |
5854 | mddev->gendisk = NULL; | |
5855 | mddev_put(mddev); | |
5856 | } | |
5857 | } | |
5858 | ||
685784aa | 5859 | subsys_initcall(md_init); |
1da177e4 LT |
5860 | module_exit(md_exit) |
5861 | ||
f91de92e N |
5862 | static int get_ro(char *buffer, struct kernel_param *kp) |
5863 | { | |
5864 | return sprintf(buffer, "%d", start_readonly); | |
5865 | } | |
5866 | static int set_ro(const char *val, struct kernel_param *kp) | |
5867 | { | |
5868 | char *e; | |
5869 | int num = simple_strtoul(val, &e, 10); | |
5870 | if (*val && (*e == '\0' || *e == '\n')) { | |
5871 | start_readonly = num; | |
4dbcdc75 | 5872 | return 0; |
f91de92e N |
5873 | } |
5874 | return -EINVAL; | |
5875 | } | |
5876 | ||
80ca3a44 N |
5877 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
5878 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 5879 | |
f91de92e | 5880 | |
1da177e4 LT |
5881 | EXPORT_SYMBOL(register_md_personality); |
5882 | EXPORT_SYMBOL(unregister_md_personality); | |
5883 | EXPORT_SYMBOL(md_error); | |
5884 | EXPORT_SYMBOL(md_done_sync); | |
5885 | EXPORT_SYMBOL(md_write_start); | |
5886 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
5887 | EXPORT_SYMBOL(md_register_thread); |
5888 | EXPORT_SYMBOL(md_unregister_thread); | |
5889 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
5890 | EXPORT_SYMBOL(md_check_recovery); |
5891 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 5892 | MODULE_ALIAS("md"); |
72008652 | 5893 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |