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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/config.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 LT |
41 | #include <linux/sysctl.h> |
42 | #include <linux/devfs_fs_kernel.h> | |
43 | #include <linux/buffer_head.h> /* for invalidate_bdev */ | |
44 | #include <linux/suspend.h> | |
d7603b7e | 45 | #include <linux/poll.h> |
48c9c27b | 46 | #include <linux/mutex.h> |
16f17b39 | 47 | #include <linux/ctype.h> |
1da177e4 LT |
48 | |
49 | #include <linux/init.h> | |
50 | ||
32a7627c N |
51 | #include <linux/file.h> |
52 | ||
1da177e4 LT |
53 | #ifdef CONFIG_KMOD |
54 | #include <linux/kmod.h> | |
55 | #endif | |
56 | ||
57 | #include <asm/unaligned.h> | |
58 | ||
59 | #define MAJOR_NR MD_MAJOR | |
60 | #define MD_DRIVER | |
61 | ||
62 | /* 63 partitions with the alternate major number (mdp) */ | |
63 | #define MdpMinorShift 6 | |
64 | ||
65 | #define DEBUG 0 | |
66 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
67 | ||
68 | ||
69 | #ifndef MODULE | |
70 | static void autostart_arrays (int part); | |
71 | #endif | |
72 | ||
2604b703 | 73 | static LIST_HEAD(pers_list); |
1da177e4 LT |
74 | static DEFINE_SPINLOCK(pers_lock); |
75 | ||
5e56341d AB |
76 | static void md_print_devices(void); |
77 | ||
78 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } | |
79 | ||
1da177e4 LT |
80 | /* |
81 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
82 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
83 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 84 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
85 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
86 | * speed limit - in case reconstruction slows down your system despite | |
87 | * idle IO detection. | |
88 | * | |
89 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 90 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
91 | */ |
92 | ||
93 | static int sysctl_speed_limit_min = 1000; | |
94 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
95 | static inline int speed_min(mddev_t *mddev) |
96 | { | |
97 | return mddev->sync_speed_min ? | |
98 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
99 | } | |
100 | ||
101 | static inline int speed_max(mddev_t *mddev) | |
102 | { | |
103 | return mddev->sync_speed_max ? | |
104 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
105 | } | |
1da177e4 LT |
106 | |
107 | static struct ctl_table_header *raid_table_header; | |
108 | ||
109 | static ctl_table raid_table[] = { | |
110 | { | |
111 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
112 | .procname = "speed_limit_min", | |
113 | .data = &sysctl_speed_limit_min, | |
114 | .maxlen = sizeof(int), | |
115 | .mode = 0644, | |
116 | .proc_handler = &proc_dointvec, | |
117 | }, | |
118 | { | |
119 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
120 | .procname = "speed_limit_max", | |
121 | .data = &sysctl_speed_limit_max, | |
122 | .maxlen = sizeof(int), | |
123 | .mode = 0644, | |
124 | .proc_handler = &proc_dointvec, | |
125 | }, | |
126 | { .ctl_name = 0 } | |
127 | }; | |
128 | ||
129 | static ctl_table raid_dir_table[] = { | |
130 | { | |
131 | .ctl_name = DEV_RAID, | |
132 | .procname = "raid", | |
133 | .maxlen = 0, | |
134 | .mode = 0555, | |
135 | .child = raid_table, | |
136 | }, | |
137 | { .ctl_name = 0 } | |
138 | }; | |
139 | ||
140 | static ctl_table raid_root_table[] = { | |
141 | { | |
142 | .ctl_name = CTL_DEV, | |
143 | .procname = "dev", | |
144 | .maxlen = 0, | |
145 | .mode = 0555, | |
146 | .child = raid_dir_table, | |
147 | }, | |
148 | { .ctl_name = 0 } | |
149 | }; | |
150 | ||
151 | static struct block_device_operations md_fops; | |
152 | ||
f91de92e N |
153 | static int start_readonly; |
154 | ||
d7603b7e N |
155 | /* |
156 | * We have a system wide 'event count' that is incremented | |
157 | * on any 'interesting' event, and readers of /proc/mdstat | |
158 | * can use 'poll' or 'select' to find out when the event | |
159 | * count increases. | |
160 | * | |
161 | * Events are: | |
162 | * start array, stop array, error, add device, remove device, | |
163 | * start build, activate spare | |
164 | */ | |
2989ddbd | 165 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 166 | static atomic_t md_event_count; |
29269553 | 167 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
168 | { |
169 | atomic_inc(&md_event_count); | |
170 | wake_up(&md_event_waiters); | |
4508a7a7 | 171 | sysfs_notify(&mddev->kobj, NULL, "sync_action"); |
d7603b7e | 172 | } |
29269553 | 173 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 174 | |
c331eb04 N |
175 | /* Alternate version that can be called from interrupts |
176 | * when calling sysfs_notify isn't needed. | |
177 | */ | |
178 | void md_new_event_inintr(mddev_t *mddev) | |
179 | { | |
180 | atomic_inc(&md_event_count); | |
181 | wake_up(&md_event_waiters); | |
182 | } | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * Enables to iterate over all existing md arrays | |
186 | * all_mddevs_lock protects this list. | |
187 | */ | |
188 | static LIST_HEAD(all_mddevs); | |
189 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
190 | ||
191 | ||
192 | /* | |
193 | * iterates through all used mddevs in the system. | |
194 | * We take care to grab the all_mddevs_lock whenever navigating | |
195 | * the list, and to always hold a refcount when unlocked. | |
196 | * Any code which breaks out of this loop while own | |
197 | * a reference to the current mddev and must mddev_put it. | |
198 | */ | |
199 | #define ITERATE_MDDEV(mddev,tmp) \ | |
200 | \ | |
201 | for (({ spin_lock(&all_mddevs_lock); \ | |
202 | tmp = all_mddevs.next; \ | |
203 | mddev = NULL;}); \ | |
204 | ({ if (tmp != &all_mddevs) \ | |
205 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
206 | spin_unlock(&all_mddevs_lock); \ | |
207 | if (mddev) mddev_put(mddev); \ | |
208 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
209 | tmp != &all_mddevs;}); \ | |
210 | ({ spin_lock(&all_mddevs_lock); \ | |
211 | tmp = tmp->next;}) \ | |
212 | ) | |
213 | ||
214 | ||
215 | static int md_fail_request (request_queue_t *q, struct bio *bio) | |
216 | { | |
217 | bio_io_error(bio, bio->bi_size); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
222 | { | |
223 | atomic_inc(&mddev->active); | |
224 | return mddev; | |
225 | } | |
226 | ||
227 | static void mddev_put(mddev_t *mddev) | |
228 | { | |
229 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
230 | return; | |
231 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
232 | list_del(&mddev->all_mddevs); | |
926ce2d8 | 233 | spin_unlock(&all_mddevs_lock); |
1312f40e | 234 | blk_cleanup_queue(mddev->queue); |
eae1701f | 235 | kobject_unregister(&mddev->kobj); |
926ce2d8 N |
236 | } else |
237 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
238 | } |
239 | ||
240 | static mddev_t * mddev_find(dev_t unit) | |
241 | { | |
242 | mddev_t *mddev, *new = NULL; | |
243 | ||
244 | retry: | |
245 | spin_lock(&all_mddevs_lock); | |
246 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
247 | if (mddev->unit == unit) { | |
248 | mddev_get(mddev); | |
249 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 250 | kfree(new); |
1da177e4 LT |
251 | return mddev; |
252 | } | |
253 | ||
254 | if (new) { | |
255 | list_add(&new->all_mddevs, &all_mddevs); | |
256 | spin_unlock(&all_mddevs_lock); | |
257 | return new; | |
258 | } | |
259 | spin_unlock(&all_mddevs_lock); | |
260 | ||
9ffae0cf | 261 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
262 | if (!new) |
263 | return NULL; | |
264 | ||
1da177e4 LT |
265 | new->unit = unit; |
266 | if (MAJOR(unit) == MD_MAJOR) | |
267 | new->md_minor = MINOR(unit); | |
268 | else | |
269 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
270 | ||
df5b89b3 | 271 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
272 | INIT_LIST_HEAD(&new->disks); |
273 | INIT_LIST_HEAD(&new->all_mddevs); | |
274 | init_timer(&new->safemode_timer); | |
275 | atomic_set(&new->active, 1); | |
06d91a5f | 276 | spin_lock_init(&new->write_lock); |
3d310eb7 | 277 | init_waitqueue_head(&new->sb_wait); |
1da177e4 LT |
278 | |
279 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
280 | if (!new->queue) { | |
281 | kfree(new); | |
282 | return NULL; | |
283 | } | |
89e5c8b5 | 284 | set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags); |
1da177e4 LT |
285 | |
286 | blk_queue_make_request(new->queue, md_fail_request); | |
287 | ||
288 | goto retry; | |
289 | } | |
290 | ||
291 | static inline int mddev_lock(mddev_t * mddev) | |
292 | { | |
df5b89b3 | 293 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
294 | } |
295 | ||
1da177e4 LT |
296 | static inline int mddev_trylock(mddev_t * mddev) |
297 | { | |
df5b89b3 | 298 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
299 | } |
300 | ||
301 | static inline void mddev_unlock(mddev_t * mddev) | |
302 | { | |
df5b89b3 | 303 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 304 | |
005eca5e | 305 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
306 | } |
307 | ||
2989ddbd | 308 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 LT |
309 | { |
310 | mdk_rdev_t * rdev; | |
311 | struct list_head *tmp; | |
312 | ||
313 | ITERATE_RDEV(mddev,rdev,tmp) { | |
314 | if (rdev->desc_nr == nr) | |
315 | return rdev; | |
316 | } | |
317 | return NULL; | |
318 | } | |
319 | ||
320 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
321 | { | |
322 | struct list_head *tmp; | |
323 | mdk_rdev_t *rdev; | |
324 | ||
325 | ITERATE_RDEV(mddev,rdev,tmp) { | |
326 | if (rdev->bdev->bd_dev == dev) | |
327 | return rdev; | |
328 | } | |
329 | return NULL; | |
330 | } | |
331 | ||
d9d166c2 | 332 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
333 | { |
334 | struct mdk_personality *pers; | |
d9d166c2 N |
335 | list_for_each_entry(pers, &pers_list, list) { |
336 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 337 | return pers; |
d9d166c2 N |
338 | if (strcmp(pers->name, clevel)==0) |
339 | return pers; | |
340 | } | |
2604b703 N |
341 | return NULL; |
342 | } | |
343 | ||
77933d72 | 344 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
345 | { |
346 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
347 | return MD_NEW_SIZE_BLOCKS(size); | |
348 | } | |
349 | ||
350 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
351 | { | |
352 | sector_t size; | |
353 | ||
354 | size = rdev->sb_offset; | |
355 | ||
356 | if (chunk_size) | |
357 | size &= ~((sector_t)chunk_size/1024 - 1); | |
358 | return size; | |
359 | } | |
360 | ||
361 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
362 | { | |
363 | if (rdev->sb_page) | |
364 | MD_BUG(); | |
365 | ||
366 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
367 | if (!rdev->sb_page) { | |
368 | printk(KERN_ALERT "md: out of memory.\n"); | |
369 | return -EINVAL; | |
370 | } | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | static void free_disk_sb(mdk_rdev_t * rdev) | |
376 | { | |
377 | if (rdev->sb_page) { | |
2d1f3b5d | 378 | put_page(rdev->sb_page); |
1da177e4 LT |
379 | rdev->sb_loaded = 0; |
380 | rdev->sb_page = NULL; | |
381 | rdev->sb_offset = 0; | |
382 | rdev->size = 0; | |
383 | } | |
384 | } | |
385 | ||
386 | ||
7bfa19f2 N |
387 | static int super_written(struct bio *bio, unsigned int bytes_done, int error) |
388 | { | |
389 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 390 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 N |
391 | if (bio->bi_size) |
392 | return 1; | |
393 | ||
394 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
a9701a30 | 395 | md_error(mddev, rdev); |
7bfa19f2 | 396 | |
a9701a30 N |
397 | if (atomic_dec_and_test(&mddev->pending_writes)) |
398 | wake_up(&mddev->sb_wait); | |
f8b58edf | 399 | bio_put(bio); |
7bfa19f2 N |
400 | return 0; |
401 | } | |
402 | ||
a9701a30 N |
403 | static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) |
404 | { | |
405 | struct bio *bio2 = bio->bi_private; | |
406 | mdk_rdev_t *rdev = bio2->bi_private; | |
407 | mddev_t *mddev = rdev->mddev; | |
408 | if (bio->bi_size) | |
409 | return 1; | |
410 | ||
411 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
412 | error == -EOPNOTSUPP) { | |
413 | unsigned long flags; | |
414 | /* barriers don't appear to be supported :-( */ | |
415 | set_bit(BarriersNotsupp, &rdev->flags); | |
416 | mddev->barriers_work = 0; | |
417 | spin_lock_irqsave(&mddev->write_lock, flags); | |
418 | bio2->bi_next = mddev->biolist; | |
419 | mddev->biolist = bio2; | |
420 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
421 | wake_up(&mddev->sb_wait); | |
422 | bio_put(bio); | |
423 | return 0; | |
424 | } | |
425 | bio_put(bio2); | |
426 | bio->bi_private = rdev; | |
427 | return super_written(bio, bytes_done, error); | |
428 | } | |
429 | ||
7bfa19f2 N |
430 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
431 | sector_t sector, int size, struct page *page) | |
432 | { | |
433 | /* write first size bytes of page to sector of rdev | |
434 | * Increment mddev->pending_writes before returning | |
435 | * and decrement it on completion, waking up sb_wait | |
436 | * if zero is reached. | |
437 | * If an error occurred, call md_error | |
a9701a30 N |
438 | * |
439 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
440 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
441 | */ |
442 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 443 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
444 | |
445 | bio->bi_bdev = rdev->bdev; | |
446 | bio->bi_sector = sector; | |
447 | bio_add_page(bio, page, size, 0); | |
448 | bio->bi_private = rdev; | |
449 | bio->bi_end_io = super_written; | |
a9701a30 N |
450 | bio->bi_rw = rw; |
451 | ||
7bfa19f2 | 452 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
453 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
454 | struct bio *rbio; | |
455 | rw |= (1<<BIO_RW_BARRIER); | |
456 | rbio = bio_clone(bio, GFP_NOIO); | |
457 | rbio->bi_private = bio; | |
458 | rbio->bi_end_io = super_written_barrier; | |
459 | submit_bio(rw, rbio); | |
460 | } else | |
461 | submit_bio(rw, bio); | |
462 | } | |
463 | ||
464 | void md_super_wait(mddev_t *mddev) | |
465 | { | |
466 | /* wait for all superblock writes that were scheduled to complete. | |
467 | * if any had to be retried (due to BARRIER problems), retry them | |
468 | */ | |
469 | DEFINE_WAIT(wq); | |
470 | for(;;) { | |
471 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
472 | if (atomic_read(&mddev->pending_writes)==0) | |
473 | break; | |
474 | while (mddev->biolist) { | |
475 | struct bio *bio; | |
476 | spin_lock_irq(&mddev->write_lock); | |
477 | bio = mddev->biolist; | |
478 | mddev->biolist = bio->bi_next ; | |
479 | bio->bi_next = NULL; | |
480 | spin_unlock_irq(&mddev->write_lock); | |
481 | submit_bio(bio->bi_rw, bio); | |
482 | } | |
483 | schedule(); | |
484 | } | |
485 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
486 | } |
487 | ||
1da177e4 LT |
488 | static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) |
489 | { | |
490 | if (bio->bi_size) | |
491 | return 1; | |
492 | ||
493 | complete((struct completion*)bio->bi_private); | |
494 | return 0; | |
495 | } | |
496 | ||
a654b9d8 | 497 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
498 | struct page *page, int rw) |
499 | { | |
baaa2c51 | 500 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
501 | struct completion event; |
502 | int ret; | |
503 | ||
504 | rw |= (1 << BIO_RW_SYNC); | |
505 | ||
506 | bio->bi_bdev = bdev; | |
507 | bio->bi_sector = sector; | |
508 | bio_add_page(bio, page, size, 0); | |
509 | init_completion(&event); | |
510 | bio->bi_private = &event; | |
511 | bio->bi_end_io = bi_complete; | |
512 | submit_bio(rw, bio); | |
513 | wait_for_completion(&event); | |
514 | ||
515 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
516 | bio_put(bio); | |
517 | return ret; | |
518 | } | |
a8745db2 | 519 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 520 | |
0002b271 | 521 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
522 | { |
523 | char b[BDEVNAME_SIZE]; | |
524 | if (!rdev->sb_page) { | |
525 | MD_BUG(); | |
526 | return -EINVAL; | |
527 | } | |
528 | if (rdev->sb_loaded) | |
529 | return 0; | |
530 | ||
531 | ||
0002b271 | 532 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
533 | goto fail; |
534 | rdev->sb_loaded = 1; | |
535 | return 0; | |
536 | ||
537 | fail: | |
538 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
539 | bdevname(rdev->bdev,b)); | |
540 | return -EINVAL; | |
541 | } | |
542 | ||
543 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
544 | { | |
545 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
546 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
547 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
548 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
549 | ||
550 | return 1; | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | ||
556 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
557 | { | |
558 | int ret; | |
559 | mdp_super_t *tmp1, *tmp2; | |
560 | ||
561 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
562 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
563 | ||
564 | if (!tmp1 || !tmp2) { | |
565 | ret = 0; | |
566 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
567 | goto abort; | |
568 | } | |
569 | ||
570 | *tmp1 = *sb1; | |
571 | *tmp2 = *sb2; | |
572 | ||
573 | /* | |
574 | * nr_disks is not constant | |
575 | */ | |
576 | tmp1->nr_disks = 0; | |
577 | tmp2->nr_disks = 0; | |
578 | ||
579 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
580 | ret = 0; | |
581 | else | |
582 | ret = 1; | |
583 | ||
584 | abort: | |
990a8baf JJ |
585 | kfree(tmp1); |
586 | kfree(tmp2); | |
1da177e4 LT |
587 | return ret; |
588 | } | |
589 | ||
590 | static unsigned int calc_sb_csum(mdp_super_t * sb) | |
591 | { | |
592 | unsigned int disk_csum, csum; | |
593 | ||
594 | disk_csum = sb->sb_csum; | |
595 | sb->sb_csum = 0; | |
596 | csum = csum_partial((void *)sb, MD_SB_BYTES, 0); | |
597 | sb->sb_csum = disk_csum; | |
598 | return csum; | |
599 | } | |
600 | ||
601 | ||
602 | /* | |
603 | * Handle superblock details. | |
604 | * We want to be able to handle multiple superblock formats | |
605 | * so we have a common interface to them all, and an array of | |
606 | * different handlers. | |
607 | * We rely on user-space to write the initial superblock, and support | |
608 | * reading and updating of superblocks. | |
609 | * Interface methods are: | |
610 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
611 | * loads and validates a superblock on dev. | |
612 | * if refdev != NULL, compare superblocks on both devices | |
613 | * Return: | |
614 | * 0 - dev has a superblock that is compatible with refdev | |
615 | * 1 - dev has a superblock that is compatible and newer than refdev | |
616 | * so dev should be used as the refdev in future | |
617 | * -EINVAL superblock incompatible or invalid | |
618 | * -othererror e.g. -EIO | |
619 | * | |
620 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
621 | * Verify that dev is acceptable into mddev. | |
622 | * The first time, mddev->raid_disks will be 0, and data from | |
623 | * dev should be merged in. Subsequent calls check that dev | |
624 | * is new enough. Return 0 or -EINVAL | |
625 | * | |
626 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
627 | * Update the superblock for rdev with data in mddev | |
628 | * This does not write to disc. | |
629 | * | |
630 | */ | |
631 | ||
632 | struct super_type { | |
633 | char *name; | |
634 | struct module *owner; | |
635 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
636 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
637 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
638 | }; | |
639 | ||
640 | /* | |
641 | * load_super for 0.90.0 | |
642 | */ | |
643 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
644 | { | |
645 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
646 | mdp_super_t *sb; | |
647 | int ret; | |
648 | sector_t sb_offset; | |
649 | ||
650 | /* | |
651 | * Calculate the position of the superblock, | |
652 | * it's at the end of the disk. | |
653 | * | |
654 | * It also happens to be a multiple of 4Kb. | |
655 | */ | |
656 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
657 | rdev->sb_offset = sb_offset; | |
658 | ||
0002b271 | 659 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
660 | if (ret) return ret; |
661 | ||
662 | ret = -EINVAL; | |
663 | ||
664 | bdevname(rdev->bdev, b); | |
665 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
666 | ||
667 | if (sb->md_magic != MD_SB_MAGIC) { | |
668 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
669 | b); | |
670 | goto abort; | |
671 | } | |
672 | ||
673 | if (sb->major_version != 0 || | |
f6705578 N |
674 | sb->minor_version < 90 || |
675 | sb->minor_version > 91) { | |
1da177e4 LT |
676 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
677 | sb->major_version, sb->minor_version, | |
678 | b); | |
679 | goto abort; | |
680 | } | |
681 | ||
682 | if (sb->raid_disks <= 0) | |
683 | goto abort; | |
684 | ||
685 | if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { | |
686 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", | |
687 | b); | |
688 | goto abort; | |
689 | } | |
690 | ||
691 | rdev->preferred_minor = sb->md_minor; | |
692 | rdev->data_offset = 0; | |
0002b271 | 693 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
694 | |
695 | if (sb->level == LEVEL_MULTIPATH) | |
696 | rdev->desc_nr = -1; | |
697 | else | |
698 | rdev->desc_nr = sb->this_disk.number; | |
699 | ||
700 | if (refdev == 0) | |
701 | ret = 1; | |
702 | else { | |
703 | __u64 ev1, ev2; | |
704 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
705 | if (!uuid_equal(refsb, sb)) { | |
706 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
707 | b, bdevname(refdev->bdev,b2)); | |
708 | goto abort; | |
709 | } | |
710 | if (!sb_equal(refsb, sb)) { | |
711 | printk(KERN_WARNING "md: %s has same UUID" | |
712 | " but different superblock to %s\n", | |
713 | b, bdevname(refdev->bdev, b2)); | |
714 | goto abort; | |
715 | } | |
716 | ev1 = md_event(sb); | |
717 | ev2 = md_event(refsb); | |
718 | if (ev1 > ev2) | |
719 | ret = 1; | |
720 | else | |
721 | ret = 0; | |
722 | } | |
723 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
724 | ||
2bf071bf N |
725 | if (rdev->size < sb->size && sb->level > 1) |
726 | /* "this cannot possibly happen" ... */ | |
727 | ret = -EINVAL; | |
728 | ||
1da177e4 LT |
729 | abort: |
730 | return ret; | |
731 | } | |
732 | ||
733 | /* | |
734 | * validate_super for 0.90.0 | |
735 | */ | |
736 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
737 | { | |
738 | mdp_disk_t *desc; | |
739 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 740 | __u64 ev1 = md_event(sb); |
1da177e4 | 741 | |
41158c7e | 742 | rdev->raid_disk = -1; |
b2d444d7 | 743 | rdev->flags = 0; |
1da177e4 LT |
744 | if (mddev->raid_disks == 0) { |
745 | mddev->major_version = 0; | |
746 | mddev->minor_version = sb->minor_version; | |
747 | mddev->patch_version = sb->patch_version; | |
748 | mddev->persistent = ! sb->not_persistent; | |
749 | mddev->chunk_size = sb->chunk_size; | |
750 | mddev->ctime = sb->ctime; | |
751 | mddev->utime = sb->utime; | |
752 | mddev->level = sb->level; | |
d9d166c2 | 753 | mddev->clevel[0] = 0; |
1da177e4 LT |
754 | mddev->layout = sb->layout; |
755 | mddev->raid_disks = sb->raid_disks; | |
756 | mddev->size = sb->size; | |
07d84d10 | 757 | mddev->events = ev1; |
9223214e | 758 | mddev->bitmap_offset = 0; |
36fa3063 | 759 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 760 | |
f6705578 N |
761 | if (mddev->minor_version >= 91) { |
762 | mddev->reshape_position = sb->reshape_position; | |
763 | mddev->delta_disks = sb->delta_disks; | |
764 | mddev->new_level = sb->new_level; | |
765 | mddev->new_layout = sb->new_layout; | |
766 | mddev->new_chunk = sb->new_chunk; | |
767 | } else { | |
768 | mddev->reshape_position = MaxSector; | |
769 | mddev->delta_disks = 0; | |
770 | mddev->new_level = mddev->level; | |
771 | mddev->new_layout = mddev->layout; | |
772 | mddev->new_chunk = mddev->chunk_size; | |
773 | } | |
774 | ||
1da177e4 LT |
775 | if (sb->state & (1<<MD_SB_CLEAN)) |
776 | mddev->recovery_cp = MaxSector; | |
777 | else { | |
778 | if (sb->events_hi == sb->cp_events_hi && | |
779 | sb->events_lo == sb->cp_events_lo) { | |
780 | mddev->recovery_cp = sb->recovery_cp; | |
781 | } else | |
782 | mddev->recovery_cp = 0; | |
783 | } | |
784 | ||
785 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
786 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
787 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
788 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
789 | ||
790 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
791 | |
792 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
793 | mddev->bitmap_file == NULL) { | |
c5a10f62 N |
794 | if (mddev->level != 1 && mddev->level != 4 |
795 | && mddev->level != 5 && mddev->level != 6 | |
6cce3b23 | 796 | && mddev->level != 10) { |
a654b9d8 | 797 | /* FIXME use a better test */ |
6cce3b23 | 798 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); |
a654b9d8 N |
799 | return -EINVAL; |
800 | } | |
36fa3063 | 801 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 N |
802 | } |
803 | ||
41158c7e N |
804 | } else if (mddev->pers == NULL) { |
805 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
806 | ++ev1; |
807 | if (ev1 < mddev->events) | |
808 | return -EINVAL; | |
41158c7e N |
809 | } else if (mddev->bitmap) { |
810 | /* if adding to array with a bitmap, then we can accept an | |
811 | * older device ... but not too old. | |
812 | */ | |
41158c7e N |
813 | if (ev1 < mddev->bitmap->events_cleared) |
814 | return 0; | |
07d84d10 N |
815 | } else { |
816 | if (ev1 < mddev->events) | |
817 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
818 | return 0; | |
819 | } | |
41158c7e | 820 | |
1da177e4 | 821 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
822 | desc = sb->disks + rdev->desc_nr; |
823 | ||
824 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 825 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
826 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
827 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 828 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
829 | rdev->raid_disk = desc->raid_disk; |
830 | } | |
8ddf9efe N |
831 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
832 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 833 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 834 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
835 | return 0; |
836 | } | |
837 | ||
838 | /* | |
839 | * sync_super for 0.90.0 | |
840 | */ | |
841 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
842 | { | |
843 | mdp_super_t *sb; | |
844 | struct list_head *tmp; | |
845 | mdk_rdev_t *rdev2; | |
846 | int next_spare = mddev->raid_disks; | |
19133a42 | 847 | |
1da177e4 LT |
848 | |
849 | /* make rdev->sb match mddev data.. | |
850 | * | |
851 | * 1/ zero out disks | |
852 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
853 | * 3/ any empty disks < next_spare become removed | |
854 | * | |
855 | * disks[0] gets initialised to REMOVED because | |
856 | * we cannot be sure from other fields if it has | |
857 | * been initialised or not. | |
858 | */ | |
859 | int i; | |
860 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
861 | ||
61181565 N |
862 | rdev->sb_size = MD_SB_BYTES; |
863 | ||
1da177e4 LT |
864 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
865 | ||
866 | memset(sb, 0, sizeof(*sb)); | |
867 | ||
868 | sb->md_magic = MD_SB_MAGIC; | |
869 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
870 | sb->patch_version = mddev->patch_version; |
871 | sb->gvalid_words = 0; /* ignored */ | |
872 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
873 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
874 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
875 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
876 | ||
877 | sb->ctime = mddev->ctime; | |
878 | sb->level = mddev->level; | |
879 | sb->size = mddev->size; | |
880 | sb->raid_disks = mddev->raid_disks; | |
881 | sb->md_minor = mddev->md_minor; | |
882 | sb->not_persistent = !mddev->persistent; | |
883 | sb->utime = mddev->utime; | |
884 | sb->state = 0; | |
885 | sb->events_hi = (mddev->events>>32); | |
886 | sb->events_lo = (u32)mddev->events; | |
887 | ||
f6705578 N |
888 | if (mddev->reshape_position == MaxSector) |
889 | sb->minor_version = 90; | |
890 | else { | |
891 | sb->minor_version = 91; | |
892 | sb->reshape_position = mddev->reshape_position; | |
893 | sb->new_level = mddev->new_level; | |
894 | sb->delta_disks = mddev->delta_disks; | |
895 | sb->new_layout = mddev->new_layout; | |
896 | sb->new_chunk = mddev->new_chunk; | |
897 | } | |
898 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
899 | if (mddev->in_sync) |
900 | { | |
901 | sb->recovery_cp = mddev->recovery_cp; | |
902 | sb->cp_events_hi = (mddev->events>>32); | |
903 | sb->cp_events_lo = (u32)mddev->events; | |
904 | if (mddev->recovery_cp == MaxSector) | |
905 | sb->state = (1<< MD_SB_CLEAN); | |
906 | } else | |
907 | sb->recovery_cp = 0; | |
908 | ||
909 | sb->layout = mddev->layout; | |
910 | sb->chunk_size = mddev->chunk_size; | |
911 | ||
a654b9d8 N |
912 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
913 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
914 | ||
1da177e4 LT |
915 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
916 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
917 | mdp_disk_t *d; | |
86e6ffdd | 918 | int desc_nr; |
b2d444d7 N |
919 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
920 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 921 | desc_nr = rdev2->raid_disk; |
1da177e4 | 922 | else |
86e6ffdd | 923 | desc_nr = next_spare++; |
19133a42 | 924 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
925 | d = &sb->disks[rdev2->desc_nr]; |
926 | nr_disks++; | |
927 | d->number = rdev2->desc_nr; | |
928 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
929 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
930 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
931 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
932 | d->raid_disk = rdev2->raid_disk; |
933 | else | |
934 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 935 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 936 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 937 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
938 | d->state = (1<<MD_DISK_ACTIVE); |
939 | d->state |= (1<<MD_DISK_SYNC); | |
940 | active++; | |
941 | working++; | |
942 | } else { | |
943 | d->state = 0; | |
944 | spare++; | |
945 | working++; | |
946 | } | |
8ddf9efe N |
947 | if (test_bit(WriteMostly, &rdev2->flags)) |
948 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 949 | } |
1da177e4 LT |
950 | /* now set the "removed" and "faulty" bits on any missing devices */ |
951 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
952 | mdp_disk_t *d = &sb->disks[i]; | |
953 | if (d->state == 0 && d->number == 0) { | |
954 | d->number = i; | |
955 | d->raid_disk = i; | |
956 | d->state = (1<<MD_DISK_REMOVED); | |
957 | d->state |= (1<<MD_DISK_FAULTY); | |
958 | failed++; | |
959 | } | |
960 | } | |
961 | sb->nr_disks = nr_disks; | |
962 | sb->active_disks = active; | |
963 | sb->working_disks = working; | |
964 | sb->failed_disks = failed; | |
965 | sb->spare_disks = spare; | |
966 | ||
967 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
968 | sb->sb_csum = calc_sb_csum(sb); | |
969 | } | |
970 | ||
971 | /* | |
972 | * version 1 superblock | |
973 | */ | |
974 | ||
975 | static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
976 | { | |
977 | unsigned int disk_csum, csum; | |
978 | unsigned long long newcsum; | |
979 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
980 | unsigned int *isuper = (unsigned int*)sb; | |
981 | int i; | |
982 | ||
983 | disk_csum = sb->sb_csum; | |
984 | sb->sb_csum = 0; | |
985 | newcsum = 0; | |
986 | for (i=0; size>=4; size -= 4 ) | |
987 | newcsum += le32_to_cpu(*isuper++); | |
988 | ||
989 | if (size == 2) | |
990 | newcsum += le16_to_cpu(*(unsigned short*) isuper); | |
991 | ||
992 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
993 | sb->sb_csum = disk_csum; | |
994 | return cpu_to_le32(csum); | |
995 | } | |
996 | ||
997 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
998 | { | |
999 | struct mdp_superblock_1 *sb; | |
1000 | int ret; | |
1001 | sector_t sb_offset; | |
1002 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 1003 | int bmask; |
1da177e4 LT |
1004 | |
1005 | /* | |
1006 | * Calculate the position of the superblock. | |
1007 | * It is always aligned to a 4K boundary and | |
1008 | * depeding on minor_version, it can be: | |
1009 | * 0: At least 8K, but less than 12K, from end of device | |
1010 | * 1: At start of device | |
1011 | * 2: 4K from start of device. | |
1012 | */ | |
1013 | switch(minor_version) { | |
1014 | case 0: | |
1015 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
1016 | sb_offset -= 8*2; | |
39730960 | 1017 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
1018 | /* convert from sectors to K */ |
1019 | sb_offset /= 2; | |
1020 | break; | |
1021 | case 1: | |
1022 | sb_offset = 0; | |
1023 | break; | |
1024 | case 2: | |
1025 | sb_offset = 4; | |
1026 | break; | |
1027 | default: | |
1028 | return -EINVAL; | |
1029 | } | |
1030 | rdev->sb_offset = sb_offset; | |
1031 | ||
0002b271 N |
1032 | /* superblock is rarely larger than 1K, but it can be larger, |
1033 | * and it is safe to read 4k, so we do that | |
1034 | */ | |
1035 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1036 | if (ret) return ret; |
1037 | ||
1038 | ||
1039 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1040 | ||
1041 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1042 | sb->major_version != cpu_to_le32(1) || | |
1043 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
1044 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 1045 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1046 | return -EINVAL; |
1047 | ||
1048 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1049 | printk("md: invalid superblock checksum on %s\n", | |
1050 | bdevname(rdev->bdev,b)); | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | if (le64_to_cpu(sb->data_size) < 10) { | |
1054 | printk("md: data_size too small on %s\n", | |
1055 | bdevname(rdev->bdev,b)); | |
1056 | return -EINVAL; | |
1057 | } | |
1058 | rdev->preferred_minor = 0xffff; | |
1059 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1060 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1061 | |
0002b271 | 1062 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1063 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
1064 | if (rdev->sb_size & bmask) |
1065 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
1066 | ||
1da177e4 | 1067 | if (refdev == 0) |
8ed75463 | 1068 | ret = 1; |
1da177e4 LT |
1069 | else { |
1070 | __u64 ev1, ev2; | |
1071 | struct mdp_superblock_1 *refsb = | |
1072 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1073 | ||
1074 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1075 | sb->level != refsb->level || | |
1076 | sb->layout != refsb->layout || | |
1077 | sb->chunksize != refsb->chunksize) { | |
1078 | printk(KERN_WARNING "md: %s has strangely different" | |
1079 | " superblock to %s\n", | |
1080 | bdevname(rdev->bdev,b), | |
1081 | bdevname(refdev->bdev,b2)); | |
1082 | return -EINVAL; | |
1083 | } | |
1084 | ev1 = le64_to_cpu(sb->events); | |
1085 | ev2 = le64_to_cpu(refsb->events); | |
1086 | ||
1087 | if (ev1 > ev2) | |
8ed75463 N |
1088 | ret = 1; |
1089 | else | |
1090 | ret = 0; | |
1da177e4 LT |
1091 | } |
1092 | if (minor_version) | |
1093 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1094 | else | |
1095 | rdev->size = rdev->sb_offset; | |
1096 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1097 | return -EINVAL; | |
1098 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1099 | if (le32_to_cpu(sb->chunksize)) | |
1100 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf N |
1101 | |
1102 | if (le32_to_cpu(sb->size) > rdev->size*2) | |
1103 | return -EINVAL; | |
8ed75463 | 1104 | return ret; |
1da177e4 LT |
1105 | } |
1106 | ||
1107 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1108 | { | |
1109 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1110 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1111 | |
41158c7e | 1112 | rdev->raid_disk = -1; |
b2d444d7 | 1113 | rdev->flags = 0; |
1da177e4 LT |
1114 | if (mddev->raid_disks == 0) { |
1115 | mddev->major_version = 1; | |
1116 | mddev->patch_version = 0; | |
1117 | mddev->persistent = 1; | |
1118 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
1119 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1120 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1121 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1122 | mddev->clevel[0] = 0; |
1da177e4 LT |
1123 | mddev->layout = le32_to_cpu(sb->layout); |
1124 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1125 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1126 | mddev->events = ev1; |
9223214e | 1127 | mddev->bitmap_offset = 0; |
29fc7e3e | 1128 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1129 | |
1130 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1131 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1132 | ||
1133 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1134 | |
71c0805c | 1135 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
a654b9d8 | 1136 | mddev->bitmap_file == NULL ) { |
6cce3b23 N |
1137 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
1138 | && mddev->level != 10) { | |
1139 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); | |
a654b9d8 N |
1140 | return -EINVAL; |
1141 | } | |
1142 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); | |
1143 | } | |
f6705578 N |
1144 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1145 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1146 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1147 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1148 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1149 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1150 | } else { | |
1151 | mddev->reshape_position = MaxSector; | |
1152 | mddev->delta_disks = 0; | |
1153 | mddev->new_level = mddev->level; | |
1154 | mddev->new_layout = mddev->layout; | |
1155 | mddev->new_chunk = mddev->chunk_size; | |
1156 | } | |
1157 | ||
41158c7e N |
1158 | } else if (mddev->pers == NULL) { |
1159 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1160 | ++ev1; |
1161 | if (ev1 < mddev->events) | |
1162 | return -EINVAL; | |
41158c7e N |
1163 | } else if (mddev->bitmap) { |
1164 | /* If adding to array with a bitmap, then we can accept an | |
1165 | * older device, but not too old. | |
1166 | */ | |
41158c7e N |
1167 | if (ev1 < mddev->bitmap->events_cleared) |
1168 | return 0; | |
07d84d10 N |
1169 | } else { |
1170 | if (ev1 < mddev->events) | |
1171 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1172 | return 0; | |
1173 | } | |
1da177e4 LT |
1174 | if (mddev->level != LEVEL_MULTIPATH) { |
1175 | int role; | |
1176 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1177 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1178 | switch(role) { | |
1179 | case 0xffff: /* spare */ | |
1da177e4 LT |
1180 | break; |
1181 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1182 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1183 | break; |
1184 | default: | |
5fd6c1dc N |
1185 | if ((le32_to_cpu(sb->feature_map) & |
1186 | MD_FEATURE_RECOVERY_OFFSET)) | |
1187 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1188 | else | |
1189 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1190 | rdev->raid_disk = role; |
1191 | break; | |
1192 | } | |
8ddf9efe N |
1193 | if (sb->devflags & WriteMostly1) |
1194 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1195 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1196 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1197 | |
1da177e4 LT |
1198 | return 0; |
1199 | } | |
1200 | ||
1201 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1202 | { | |
1203 | struct mdp_superblock_1 *sb; | |
1204 | struct list_head *tmp; | |
1205 | mdk_rdev_t *rdev2; | |
1206 | int max_dev, i; | |
1207 | /* make rdev->sb match mddev and rdev data. */ | |
1208 | ||
1209 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1210 | ||
1211 | sb->feature_map = 0; | |
1212 | sb->pad0 = 0; | |
5fd6c1dc | 1213 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1214 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1215 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1216 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1217 | ||
1218 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1219 | sb->events = cpu_to_le64(mddev->events); | |
1220 | if (mddev->in_sync) | |
1221 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1222 | else | |
1223 | sb->resync_offset = cpu_to_le64(0); | |
1224 | ||
4dbcdc75 N |
1225 | sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors); |
1226 | ||
f0ca340c | 1227 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1228 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1229 | |
a654b9d8 N |
1230 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1231 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1232 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1233 | } |
5fd6c1dc N |
1234 | |
1235 | if (rdev->raid_disk >= 0 && | |
1236 | !test_bit(In_sync, &rdev->flags) && | |
1237 | rdev->recovery_offset > 0) { | |
1238 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1239 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1240 | } | |
1241 | ||
f6705578 N |
1242 | if (mddev->reshape_position != MaxSector) { |
1243 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1244 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1245 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1246 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1247 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1248 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1249 | } | |
a654b9d8 | 1250 | |
1da177e4 LT |
1251 | max_dev = 0; |
1252 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1253 | if (rdev2->desc_nr+1 > max_dev) | |
1254 | max_dev = rdev2->desc_nr+1; | |
1255 | ||
1256 | sb->max_dev = cpu_to_le32(max_dev); | |
1257 | for (i=0; i<max_dev;i++) | |
1258 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1259 | ||
1260 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1261 | i = rdev2->desc_nr; | |
b2d444d7 | 1262 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1263 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1264 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1265 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1266 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1267 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1268 | else |
1269 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1270 | } | |
1271 | ||
1da177e4 LT |
1272 | sb->sb_csum = calc_sb_1_csum(sb); |
1273 | } | |
1274 | ||
1275 | ||
75c96f85 | 1276 | static struct super_type super_types[] = { |
1da177e4 LT |
1277 | [0] = { |
1278 | .name = "0.90.0", | |
1279 | .owner = THIS_MODULE, | |
1280 | .load_super = super_90_load, | |
1281 | .validate_super = super_90_validate, | |
1282 | .sync_super = super_90_sync, | |
1283 | }, | |
1284 | [1] = { | |
1285 | .name = "md-1", | |
1286 | .owner = THIS_MODULE, | |
1287 | .load_super = super_1_load, | |
1288 | .validate_super = super_1_validate, | |
1289 | .sync_super = super_1_sync, | |
1290 | }, | |
1291 | }; | |
1292 | ||
1293 | static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) | |
1294 | { | |
1295 | struct list_head *tmp; | |
1296 | mdk_rdev_t *rdev; | |
1297 | ||
1298 | ITERATE_RDEV(mddev,rdev,tmp) | |
1299 | if (rdev->bdev->bd_contains == dev->bdev->bd_contains) | |
1300 | return rdev; | |
1301 | ||
1302 | return NULL; | |
1303 | } | |
1304 | ||
1305 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1306 | { | |
1307 | struct list_head *tmp; | |
1308 | mdk_rdev_t *rdev; | |
1309 | ||
1310 | ITERATE_RDEV(mddev1,rdev,tmp) | |
1311 | if (match_dev_unit(mddev2, rdev)) | |
1312 | return 1; | |
1313 | ||
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | static LIST_HEAD(pending_raid_disks); | |
1318 | ||
1319 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1320 | { | |
1321 | mdk_rdev_t *same_pdev; | |
1322 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
f637b9f9 | 1323 | struct kobject *ko; |
1edf80d3 | 1324 | char *s; |
1da177e4 LT |
1325 | |
1326 | if (rdev->mddev) { | |
1327 | MD_BUG(); | |
1328 | return -EINVAL; | |
1329 | } | |
2bf071bf N |
1330 | /* make sure rdev->size exceeds mddev->size */ |
1331 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
1332 | if (mddev->pers) | |
1333 | /* Cannot change size, so fail */ | |
1334 | return -ENOSPC; | |
1335 | else | |
1336 | mddev->size = rdev->size; | |
1337 | } | |
1da177e4 LT |
1338 | same_pdev = match_dev_unit(mddev, rdev); |
1339 | if (same_pdev) | |
1340 | printk(KERN_WARNING | |
1341 | "%s: WARNING: %s appears to be on the same physical" | |
1342 | " disk as %s. True\n protection against single-disk" | |
1343 | " failure might be compromised.\n", | |
1344 | mdname(mddev), bdevname(rdev->bdev,b), | |
1345 | bdevname(same_pdev->bdev,b2)); | |
1346 | ||
1347 | /* Verify rdev->desc_nr is unique. | |
1348 | * If it is -1, assign a free number, else | |
1349 | * check number is not in use | |
1350 | */ | |
1351 | if (rdev->desc_nr < 0) { | |
1352 | int choice = 0; | |
1353 | if (mddev->pers) choice = mddev->raid_disks; | |
1354 | while (find_rdev_nr(mddev, choice)) | |
1355 | choice++; | |
1356 | rdev->desc_nr = choice; | |
1357 | } else { | |
1358 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1359 | return -EBUSY; | |
1360 | } | |
19133a42 N |
1361 | bdevname(rdev->bdev,b); |
1362 | if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) | |
1363 | return -ENOMEM; | |
1edf80d3 NB |
1364 | while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL) |
1365 | *s = '!'; | |
1da177e4 LT |
1366 | |
1367 | list_add(&rdev->same_set, &mddev->disks); | |
1368 | rdev->mddev = mddev; | |
19133a42 | 1369 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1370 | |
9c791977 | 1371 | rdev->kobj.parent = &mddev->kobj; |
86e6ffdd N |
1372 | kobject_add(&rdev->kobj); |
1373 | ||
f637b9f9 N |
1374 | if (rdev->bdev->bd_part) |
1375 | ko = &rdev->bdev->bd_part->kobj; | |
1376 | else | |
1377 | ko = &rdev->bdev->bd_disk->kobj; | |
1378 | sysfs_create_link(&rdev->kobj, ko, "block"); | |
5463c790 | 1379 | bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk); |
1da177e4 LT |
1380 | return 0; |
1381 | } | |
1382 | ||
1383 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) | |
1384 | { | |
1385 | char b[BDEVNAME_SIZE]; | |
1386 | if (!rdev->mddev) { | |
1387 | MD_BUG(); | |
1388 | return; | |
1389 | } | |
5463c790 | 1390 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
1da177e4 LT |
1391 | list_del_init(&rdev->same_set); |
1392 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1393 | rdev->mddev = NULL; | |
86e6ffdd N |
1394 | sysfs_remove_link(&rdev->kobj, "block"); |
1395 | kobject_del(&rdev->kobj); | |
1da177e4 LT |
1396 | } |
1397 | ||
1398 | /* | |
1399 | * prevent the device from being mounted, repartitioned or | |
1400 | * otherwise reused by a RAID array (or any other kernel | |
1401 | * subsystem), by bd_claiming the device. | |
1402 | */ | |
1403 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1404 | { | |
1405 | int err = 0; | |
1406 | struct block_device *bdev; | |
1407 | char b[BDEVNAME_SIZE]; | |
1408 | ||
1409 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
1410 | if (IS_ERR(bdev)) { | |
1411 | printk(KERN_ERR "md: could not open %s.\n", | |
1412 | __bdevname(dev, b)); | |
1413 | return PTR_ERR(bdev); | |
1414 | } | |
1415 | err = bd_claim(bdev, rdev); | |
1416 | if (err) { | |
1417 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1418 | bdevname(bdev, b)); | |
1419 | blkdev_put(bdev); | |
1420 | return err; | |
1421 | } | |
1422 | rdev->bdev = bdev; | |
1423 | return err; | |
1424 | } | |
1425 | ||
1426 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1427 | { | |
1428 | struct block_device *bdev = rdev->bdev; | |
1429 | rdev->bdev = NULL; | |
1430 | if (!bdev) | |
1431 | MD_BUG(); | |
1432 | bd_release(bdev); | |
1433 | blkdev_put(bdev); | |
1434 | } | |
1435 | ||
1436 | void md_autodetect_dev(dev_t dev); | |
1437 | ||
1438 | static void export_rdev(mdk_rdev_t * rdev) | |
1439 | { | |
1440 | char b[BDEVNAME_SIZE]; | |
1441 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1442 | bdevname(rdev->bdev,b)); | |
1443 | if (rdev->mddev) | |
1444 | MD_BUG(); | |
1445 | free_disk_sb(rdev); | |
1446 | list_del_init(&rdev->same_set); | |
1447 | #ifndef MODULE | |
1448 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1449 | #endif | |
1450 | unlock_rdev(rdev); | |
86e6ffdd | 1451 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1452 | } |
1453 | ||
1454 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1455 | { | |
1456 | unbind_rdev_from_array(rdev); | |
1457 | export_rdev(rdev); | |
1458 | } | |
1459 | ||
1460 | static void export_array(mddev_t *mddev) | |
1461 | { | |
1462 | struct list_head *tmp; | |
1463 | mdk_rdev_t *rdev; | |
1464 | ||
1465 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1466 | if (!rdev->mddev) { | |
1467 | MD_BUG(); | |
1468 | continue; | |
1469 | } | |
1470 | kick_rdev_from_array(rdev); | |
1471 | } | |
1472 | if (!list_empty(&mddev->disks)) | |
1473 | MD_BUG(); | |
1474 | mddev->raid_disks = 0; | |
1475 | mddev->major_version = 0; | |
1476 | } | |
1477 | ||
1478 | static void print_desc(mdp_disk_t *desc) | |
1479 | { | |
1480 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1481 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1482 | } | |
1483 | ||
1484 | static void print_sb(mdp_super_t *sb) | |
1485 | { | |
1486 | int i; | |
1487 | ||
1488 | printk(KERN_INFO | |
1489 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1490 | sb->major_version, sb->minor_version, sb->patch_version, | |
1491 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1492 | sb->ctime); | |
1493 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1494 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1495 | sb->md_minor, sb->layout, sb->chunk_size); | |
1496 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1497 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1498 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1499 | sb->failed_disks, sb->spare_disks, | |
1500 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1501 | ||
1502 | printk(KERN_INFO); | |
1503 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1504 | mdp_disk_t *desc; | |
1505 | ||
1506 | desc = sb->disks + i; | |
1507 | if (desc->number || desc->major || desc->minor || | |
1508 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1509 | printk(" D %2d: ", i); | |
1510 | print_desc(desc); | |
1511 | } | |
1512 | } | |
1513 | printk(KERN_INFO "md: THIS: "); | |
1514 | print_desc(&sb->this_disk); | |
1515 | ||
1516 | } | |
1517 | ||
1518 | static void print_rdev(mdk_rdev_t *rdev) | |
1519 | { | |
1520 | char b[BDEVNAME_SIZE]; | |
1521 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1522 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1523 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1524 | rdev->desc_nr); | |
1da177e4 LT |
1525 | if (rdev->sb_loaded) { |
1526 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1527 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1528 | } else | |
1529 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1530 | } | |
1531 | ||
5e56341d | 1532 | static void md_print_devices(void) |
1da177e4 LT |
1533 | { |
1534 | struct list_head *tmp, *tmp2; | |
1535 | mdk_rdev_t *rdev; | |
1536 | mddev_t *mddev; | |
1537 | char b[BDEVNAME_SIZE]; | |
1538 | ||
1539 | printk("\n"); | |
1540 | printk("md: **********************************\n"); | |
1541 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1542 | printk("md: **********************************\n"); | |
1543 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1544 | |
32a7627c N |
1545 | if (mddev->bitmap) |
1546 | bitmap_print_sb(mddev->bitmap); | |
1547 | else | |
1548 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1549 | ITERATE_RDEV(mddev,rdev,tmp2) |
1550 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1551 | printk("\n"); | |
1552 | ||
1553 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1554 | print_rdev(rdev); | |
1555 | } | |
1556 | printk("md: **********************************\n"); | |
1557 | printk("\n"); | |
1558 | } | |
1559 | ||
1560 | ||
42543769 | 1561 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1562 | { |
42543769 N |
1563 | /* Update each superblock (in-memory image), but |
1564 | * if we are allowed to, skip spares which already | |
1565 | * have the right event counter, or have one earlier | |
1566 | * (which would mean they aren't being marked as dirty | |
1567 | * with the rest of the array) | |
1568 | */ | |
1da177e4 LT |
1569 | mdk_rdev_t *rdev; |
1570 | struct list_head *tmp; | |
1571 | ||
1572 | ITERATE_RDEV(mddev,rdev,tmp) { | |
42543769 N |
1573 | if (rdev->sb_events == mddev->events || |
1574 | (nospares && | |
1575 | rdev->raid_disk < 0 && | |
1576 | (rdev->sb_events&1)==0 && | |
1577 | rdev->sb_events+1 == mddev->events)) { | |
1578 | /* Don't update this superblock */ | |
1579 | rdev->sb_loaded = 2; | |
1580 | } else { | |
1581 | super_types[mddev->major_version]. | |
1582 | sync_super(mddev, rdev); | |
1583 | rdev->sb_loaded = 1; | |
1584 | } | |
1da177e4 LT |
1585 | } |
1586 | } | |
1587 | ||
f6705578 | 1588 | void md_update_sb(mddev_t * mddev) |
1da177e4 | 1589 | { |
7bfa19f2 | 1590 | int err; |
1da177e4 LT |
1591 | struct list_head *tmp; |
1592 | mdk_rdev_t *rdev; | |
06d91a5f | 1593 | int sync_req; |
42543769 | 1594 | int nospares = 0; |
1da177e4 | 1595 | |
1da177e4 | 1596 | repeat: |
a9701a30 | 1597 | spin_lock_irq(&mddev->write_lock); |
06d91a5f | 1598 | sync_req = mddev->in_sync; |
1da177e4 | 1599 | mddev->utime = get_seconds(); |
42543769 N |
1600 | if (mddev->sb_dirty == 3) |
1601 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1602 | * though if events isn't the right even/odd, we will have to do | |
1603 | * spares after all | |
1604 | */ | |
1605 | nospares = 1; | |
1606 | ||
1607 | /* If this is just a dirty<->clean transition, and the array is clean | |
1608 | * and 'events' is odd, we can roll back to the previous clean state */ | |
1609 | if (mddev->sb_dirty == 3 | |
1610 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1611 | && (mddev->events & 1)) | |
1612 | mddev->events--; | |
1613 | else { | |
1614 | /* otherwise we have to go forward and ... */ | |
1615 | mddev->events ++; | |
1616 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1617 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1618 | if ((mddev->events&1)==0) { | |
1619 | mddev->events++; | |
1620 | nospares = 0; | |
1621 | } | |
1622 | } else { | |
1623 | /* otherwise insist on an even 'events' (for clean states) */ | |
1624 | if ((mddev->events&1)) { | |
1625 | mddev->events++; | |
1626 | nospares = 0; | |
1627 | } | |
1628 | } | |
1629 | } | |
1da177e4 LT |
1630 | |
1631 | if (!mddev->events) { | |
1632 | /* | |
1633 | * oops, this 64-bit counter should never wrap. | |
1634 | * Either we are in around ~1 trillion A.C., assuming | |
1635 | * 1 reboot per second, or we have a bug: | |
1636 | */ | |
1637 | MD_BUG(); | |
1638 | mddev->events --; | |
1639 | } | |
7bfa19f2 | 1640 | mddev->sb_dirty = 2; |
42543769 | 1641 | sync_sbs(mddev, nospares); |
1da177e4 LT |
1642 | |
1643 | /* | |
1644 | * do not write anything to disk if using | |
1645 | * nonpersistent superblocks | |
1646 | */ | |
06d91a5f N |
1647 | if (!mddev->persistent) { |
1648 | mddev->sb_dirty = 0; | |
a9701a30 | 1649 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1650 | wake_up(&mddev->sb_wait); |
1da177e4 | 1651 | return; |
06d91a5f | 1652 | } |
a9701a30 | 1653 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1654 | |
1655 | dprintk(KERN_INFO | |
1656 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1657 | mdname(mddev),mddev->in_sync); | |
1658 | ||
32a7627c | 1659 | err = bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1660 | ITERATE_RDEV(mddev,rdev,tmp) { |
1661 | char b[BDEVNAME_SIZE]; | |
1662 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1663 | if (rdev->sb_loaded != 1) |
1664 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1665 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1666 | dprintk("(skipping faulty "); |
1667 | ||
1668 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1669 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1670 | md_super_write(mddev,rdev, |
0002b271 | 1671 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1672 | rdev->sb_page); |
1673 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1674 | bdevname(rdev->bdev,b), | |
1675 | (unsigned long long)rdev->sb_offset); | |
42543769 | 1676 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1677 | |
1da177e4 LT |
1678 | } else |
1679 | dprintk(")\n"); | |
7bfa19f2 | 1680 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1681 | /* only need to write one superblock... */ |
1682 | break; | |
1683 | } | |
a9701a30 | 1684 | md_super_wait(mddev); |
7bfa19f2 N |
1685 | /* if there was a failure, sb_dirty was set to 1, and we re-write super */ |
1686 | ||
a9701a30 | 1687 | spin_lock_irq(&mddev->write_lock); |
7bfa19f2 | 1688 | if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { |
06d91a5f | 1689 | /* have to write it out again */ |
a9701a30 | 1690 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1691 | goto repeat; |
1692 | } | |
1693 | mddev->sb_dirty = 0; | |
a9701a30 | 1694 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1695 | wake_up(&mddev->sb_wait); |
06d91a5f | 1696 | |
1da177e4 | 1697 | } |
f6705578 | 1698 | EXPORT_SYMBOL_GPL(md_update_sb); |
1da177e4 | 1699 | |
bce74dac N |
1700 | /* words written to sysfs files may, or my not, be \n terminated. |
1701 | * We want to accept with case. For this we use cmd_match. | |
1702 | */ | |
1703 | static int cmd_match(const char *cmd, const char *str) | |
1704 | { | |
1705 | /* See if cmd, written into a sysfs file, matches | |
1706 | * str. They must either be the same, or cmd can | |
1707 | * have a trailing newline | |
1708 | */ | |
1709 | while (*cmd && *str && *cmd == *str) { | |
1710 | cmd++; | |
1711 | str++; | |
1712 | } | |
1713 | if (*cmd == '\n') | |
1714 | cmd++; | |
1715 | if (*str || *cmd) | |
1716 | return 0; | |
1717 | return 1; | |
1718 | } | |
1719 | ||
86e6ffdd N |
1720 | struct rdev_sysfs_entry { |
1721 | struct attribute attr; | |
1722 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1723 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1724 | }; | |
1725 | ||
1726 | static ssize_t | |
96de1e66 | 1727 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1728 | { |
1729 | char *sep = ""; | |
1730 | int len=0; | |
1731 | ||
b2d444d7 | 1732 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1733 | len+= sprintf(page+len, "%sfaulty",sep); |
1734 | sep = ","; | |
1735 | } | |
b2d444d7 | 1736 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1737 | len += sprintf(page+len, "%sin_sync",sep); |
1738 | sep = ","; | |
1739 | } | |
b2d444d7 N |
1740 | if (!test_bit(Faulty, &rdev->flags) && |
1741 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1742 | len += sprintf(page+len, "%sspare", sep); |
1743 | sep = ","; | |
1744 | } | |
1745 | return len+sprintf(page+len, "\n"); | |
1746 | } | |
1747 | ||
96de1e66 N |
1748 | static struct rdev_sysfs_entry |
1749 | rdev_state = __ATTR_RO(state); | |
86e6ffdd N |
1750 | |
1751 | static ssize_t | |
96de1e66 | 1752 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1753 | { |
1754 | if (rdev->sb_loaded && rdev->sb_size) { | |
1755 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1756 | return rdev->sb_size; | |
1757 | } else | |
1758 | return 0; | |
1759 | } | |
96de1e66 N |
1760 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1761 | ||
4dbcdc75 N |
1762 | static ssize_t |
1763 | errors_show(mdk_rdev_t *rdev, char *page) | |
1764 | { | |
1765 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1766 | } | |
1767 | ||
1768 | static ssize_t | |
1769 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1770 | { | |
1771 | char *e; | |
1772 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1773 | if (*buf && (*e == 0 || *e == '\n')) { | |
1774 | atomic_set(&rdev->corrected_errors, n); | |
1775 | return len; | |
1776 | } | |
1777 | return -EINVAL; | |
1778 | } | |
1779 | static struct rdev_sysfs_entry rdev_errors = | |
1780 | __ATTR(errors, 0644, errors_show, errors_store); | |
1781 | ||
014236d2 N |
1782 | static ssize_t |
1783 | slot_show(mdk_rdev_t *rdev, char *page) | |
1784 | { | |
1785 | if (rdev->raid_disk < 0) | |
1786 | return sprintf(page, "none\n"); | |
1787 | else | |
1788 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1789 | } | |
1790 | ||
1791 | static ssize_t | |
1792 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1793 | { | |
1794 | char *e; | |
1795 | int slot = simple_strtoul(buf, &e, 10); | |
1796 | if (strncmp(buf, "none", 4)==0) | |
1797 | slot = -1; | |
1798 | else if (e==buf || (*e && *e!= '\n')) | |
1799 | return -EINVAL; | |
1800 | if (rdev->mddev->pers) | |
1801 | /* Cannot set slot in active array (yet) */ | |
1802 | return -EBUSY; | |
1803 | if (slot >= rdev->mddev->raid_disks) | |
1804 | return -ENOSPC; | |
1805 | rdev->raid_disk = slot; | |
1806 | /* assume it is working */ | |
1807 | rdev->flags = 0; | |
1808 | set_bit(In_sync, &rdev->flags); | |
1809 | return len; | |
1810 | } | |
1811 | ||
1812 | ||
1813 | static struct rdev_sysfs_entry rdev_slot = | |
1814 | __ATTR(slot, 0644, slot_show, slot_store); | |
1815 | ||
93c8cad0 N |
1816 | static ssize_t |
1817 | offset_show(mdk_rdev_t *rdev, char *page) | |
1818 | { | |
6961ece4 | 1819 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
1820 | } |
1821 | ||
1822 | static ssize_t | |
1823 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1824 | { | |
1825 | char *e; | |
1826 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
1827 | if (e==buf || (*e && *e != '\n')) | |
1828 | return -EINVAL; | |
1829 | if (rdev->mddev->pers) | |
1830 | return -EBUSY; | |
1831 | rdev->data_offset = offset; | |
1832 | return len; | |
1833 | } | |
1834 | ||
1835 | static struct rdev_sysfs_entry rdev_offset = | |
1836 | __ATTR(offset, 0644, offset_show, offset_store); | |
1837 | ||
83303b61 N |
1838 | static ssize_t |
1839 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
1840 | { | |
1841 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
1842 | } | |
1843 | ||
1844 | static ssize_t | |
1845 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1846 | { | |
1847 | char *e; | |
1848 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
1849 | if (e==buf || (*e && *e != '\n')) | |
1850 | return -EINVAL; | |
1851 | if (rdev->mddev->pers) | |
1852 | return -EBUSY; | |
1853 | rdev->size = size; | |
1854 | if (size < rdev->mddev->size || rdev->mddev->size == 0) | |
1855 | rdev->mddev->size = size; | |
1856 | return len; | |
1857 | } | |
1858 | ||
1859 | static struct rdev_sysfs_entry rdev_size = | |
1860 | __ATTR(size, 0644, rdev_size_show, rdev_size_store); | |
1861 | ||
86e6ffdd N |
1862 | static struct attribute *rdev_default_attrs[] = { |
1863 | &rdev_state.attr, | |
1864 | &rdev_super.attr, | |
4dbcdc75 | 1865 | &rdev_errors.attr, |
014236d2 | 1866 | &rdev_slot.attr, |
93c8cad0 | 1867 | &rdev_offset.attr, |
83303b61 | 1868 | &rdev_size.attr, |
86e6ffdd N |
1869 | NULL, |
1870 | }; | |
1871 | static ssize_t | |
1872 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1873 | { | |
1874 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1875 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1876 | ||
1877 | if (!entry->show) | |
1878 | return -EIO; | |
1879 | return entry->show(rdev, page); | |
1880 | } | |
1881 | ||
1882 | static ssize_t | |
1883 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1884 | const char *page, size_t length) | |
1885 | { | |
1886 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1887 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1888 | ||
1889 | if (!entry->store) | |
1890 | return -EIO; | |
1891 | return entry->store(rdev, page, length); | |
1892 | } | |
1893 | ||
1894 | static void rdev_free(struct kobject *ko) | |
1895 | { | |
1896 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
1897 | kfree(rdev); | |
1898 | } | |
1899 | static struct sysfs_ops rdev_sysfs_ops = { | |
1900 | .show = rdev_attr_show, | |
1901 | .store = rdev_attr_store, | |
1902 | }; | |
1903 | static struct kobj_type rdev_ktype = { | |
1904 | .release = rdev_free, | |
1905 | .sysfs_ops = &rdev_sysfs_ops, | |
1906 | .default_attrs = rdev_default_attrs, | |
1907 | }; | |
1908 | ||
1da177e4 LT |
1909 | /* |
1910 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
1911 | * | |
1912 | * mark the device faulty if: | |
1913 | * | |
1914 | * - the device is nonexistent (zero size) | |
1915 | * - the device has no valid superblock | |
1916 | * | |
1917 | * a faulty rdev _never_ has rdev->sb set. | |
1918 | */ | |
1919 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
1920 | { | |
1921 | char b[BDEVNAME_SIZE]; | |
1922 | int err; | |
1923 | mdk_rdev_t *rdev; | |
1924 | sector_t size; | |
1925 | ||
9ffae0cf | 1926 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
1927 | if (!rdev) { |
1928 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
1929 | return ERR_PTR(-ENOMEM); | |
1930 | } | |
1da177e4 LT |
1931 | |
1932 | if ((err = alloc_disk_sb(rdev))) | |
1933 | goto abort_free; | |
1934 | ||
1935 | err = lock_rdev(rdev, newdev); | |
1936 | if (err) | |
1937 | goto abort_free; | |
1938 | ||
86e6ffdd N |
1939 | rdev->kobj.parent = NULL; |
1940 | rdev->kobj.ktype = &rdev_ktype; | |
1941 | kobject_init(&rdev->kobj); | |
1942 | ||
1da177e4 | 1943 | rdev->desc_nr = -1; |
b2d444d7 | 1944 | rdev->flags = 0; |
1da177e4 | 1945 | rdev->data_offset = 0; |
42543769 | 1946 | rdev->sb_events = 0; |
1da177e4 | 1947 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 1948 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 1949 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
1950 | |
1951 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
1952 | if (!size) { | |
1953 | printk(KERN_WARNING | |
1954 | "md: %s has zero or unknown size, marking faulty!\n", | |
1955 | bdevname(rdev->bdev,b)); | |
1956 | err = -EINVAL; | |
1957 | goto abort_free; | |
1958 | } | |
1959 | ||
1960 | if (super_format >= 0) { | |
1961 | err = super_types[super_format]. | |
1962 | load_super(rdev, NULL, super_minor); | |
1963 | if (err == -EINVAL) { | |
1964 | printk(KERN_WARNING | |
1965 | "md: %s has invalid sb, not importing!\n", | |
1966 | bdevname(rdev->bdev,b)); | |
1967 | goto abort_free; | |
1968 | } | |
1969 | if (err < 0) { | |
1970 | printk(KERN_WARNING | |
1971 | "md: could not read %s's sb, not importing!\n", | |
1972 | bdevname(rdev->bdev,b)); | |
1973 | goto abort_free; | |
1974 | } | |
1975 | } | |
1976 | INIT_LIST_HEAD(&rdev->same_set); | |
1977 | ||
1978 | return rdev; | |
1979 | ||
1980 | abort_free: | |
1981 | if (rdev->sb_page) { | |
1982 | if (rdev->bdev) | |
1983 | unlock_rdev(rdev); | |
1984 | free_disk_sb(rdev); | |
1985 | } | |
1986 | kfree(rdev); | |
1987 | return ERR_PTR(err); | |
1988 | } | |
1989 | ||
1990 | /* | |
1991 | * Check a full RAID array for plausibility | |
1992 | */ | |
1993 | ||
1994 | ||
a757e64c | 1995 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
1996 | { |
1997 | int i; | |
1998 | struct list_head *tmp; | |
1999 | mdk_rdev_t *rdev, *freshest; | |
2000 | char b[BDEVNAME_SIZE]; | |
2001 | ||
2002 | freshest = NULL; | |
2003 | ITERATE_RDEV(mddev,rdev,tmp) | |
2004 | switch (super_types[mddev->major_version]. | |
2005 | load_super(rdev, freshest, mddev->minor_version)) { | |
2006 | case 1: | |
2007 | freshest = rdev; | |
2008 | break; | |
2009 | case 0: | |
2010 | break; | |
2011 | default: | |
2012 | printk( KERN_ERR \ | |
2013 | "md: fatal superblock inconsistency in %s" | |
2014 | " -- removing from array\n", | |
2015 | bdevname(rdev->bdev,b)); | |
2016 | kick_rdev_from_array(rdev); | |
2017 | } | |
2018 | ||
2019 | ||
2020 | super_types[mddev->major_version]. | |
2021 | validate_super(mddev, freshest); | |
2022 | ||
2023 | i = 0; | |
2024 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2025 | if (rdev != freshest) | |
2026 | if (super_types[mddev->major_version]. | |
2027 | validate_super(mddev, rdev)) { | |
2028 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2029 | " from array!\n", | |
2030 | bdevname(rdev->bdev,b)); | |
2031 | kick_rdev_from_array(rdev); | |
2032 | continue; | |
2033 | } | |
2034 | if (mddev->level == LEVEL_MULTIPATH) { | |
2035 | rdev->desc_nr = i++; | |
2036 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2037 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
2038 | } |
2039 | } | |
2040 | ||
2041 | ||
2042 | ||
2043 | if (mddev->recovery_cp != MaxSector && | |
2044 | mddev->level >= 1) | |
2045 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2046 | " -- starting background reconstruction\n", | |
2047 | mdname(mddev)); | |
2048 | ||
1da177e4 LT |
2049 | } |
2050 | ||
16f17b39 N |
2051 | static ssize_t |
2052 | safe_delay_show(mddev_t *mddev, char *page) | |
2053 | { | |
2054 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2055 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2056 | } | |
2057 | static ssize_t | |
2058 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2059 | { | |
2060 | int scale=1; | |
2061 | int dot=0; | |
2062 | int i; | |
2063 | unsigned long msec; | |
2064 | char buf[30]; | |
2065 | char *e; | |
2066 | /* remove a period, and count digits after it */ | |
2067 | if (len >= sizeof(buf)) | |
2068 | return -EINVAL; | |
2069 | strlcpy(buf, cbuf, len); | |
2070 | buf[len] = 0; | |
2071 | for (i=0; i<len; i++) { | |
2072 | if (dot) { | |
2073 | if (isdigit(buf[i])) { | |
2074 | buf[i-1] = buf[i]; | |
2075 | scale *= 10; | |
2076 | } | |
2077 | buf[i] = 0; | |
2078 | } else if (buf[i] == '.') { | |
2079 | dot=1; | |
2080 | buf[i] = 0; | |
2081 | } | |
2082 | } | |
2083 | msec = simple_strtoul(buf, &e, 10); | |
2084 | if (e == buf || (*e && *e != '\n')) | |
2085 | return -EINVAL; | |
2086 | msec = (msec * 1000) / scale; | |
2087 | if (msec == 0) | |
2088 | mddev->safemode_delay = 0; | |
2089 | else { | |
2090 | mddev->safemode_delay = (msec*HZ)/1000; | |
2091 | if (mddev->safemode_delay == 0) | |
2092 | mddev->safemode_delay = 1; | |
2093 | } | |
2094 | return len; | |
2095 | } | |
2096 | static struct md_sysfs_entry md_safe_delay = | |
2097 | __ATTR(safe_mode_delay, 0644,safe_delay_show, safe_delay_store); | |
2098 | ||
eae1701f | 2099 | static ssize_t |
96de1e66 | 2100 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2101 | { |
2604b703 | 2102 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2103 | if (p) |
eae1701f | 2104 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2105 | else if (mddev->clevel[0]) |
2106 | return sprintf(page, "%s\n", mddev->clevel); | |
2107 | else if (mddev->level != LEVEL_NONE) | |
2108 | return sprintf(page, "%d\n", mddev->level); | |
2109 | else | |
2110 | return 0; | |
eae1701f N |
2111 | } |
2112 | ||
d9d166c2 N |
2113 | static ssize_t |
2114 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2115 | { | |
2116 | int rv = len; | |
2117 | if (mddev->pers) | |
2118 | return -EBUSY; | |
2119 | if (len == 0) | |
2120 | return 0; | |
2121 | if (len >= sizeof(mddev->clevel)) | |
2122 | return -ENOSPC; | |
2123 | strncpy(mddev->clevel, buf, len); | |
2124 | if (mddev->clevel[len-1] == '\n') | |
2125 | len--; | |
2126 | mddev->clevel[len] = 0; | |
2127 | mddev->level = LEVEL_NONE; | |
2128 | return rv; | |
2129 | } | |
2130 | ||
2131 | static struct md_sysfs_entry md_level = | |
2132 | __ATTR(level, 0644, level_show, level_store); | |
eae1701f N |
2133 | |
2134 | static ssize_t | |
96de1e66 | 2135 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2136 | { |
bb636547 N |
2137 | if (mddev->raid_disks == 0) |
2138 | return 0; | |
eae1701f N |
2139 | return sprintf(page, "%d\n", mddev->raid_disks); |
2140 | } | |
2141 | ||
da943b99 N |
2142 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2143 | ||
2144 | static ssize_t | |
2145 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2146 | { | |
2147 | /* can only set raid_disks if array is not yet active */ | |
2148 | char *e; | |
2149 | int rv = 0; | |
2150 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2151 | ||
2152 | if (!*buf || (*e && *e != '\n')) | |
2153 | return -EINVAL; | |
2154 | ||
2155 | if (mddev->pers) | |
2156 | rv = update_raid_disks(mddev, n); | |
2157 | else | |
2158 | mddev->raid_disks = n; | |
2159 | return rv ? rv : len; | |
2160 | } | |
2161 | static struct md_sysfs_entry md_raid_disks = | |
2162 | __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store); | |
eae1701f | 2163 | |
3b34380a N |
2164 | static ssize_t |
2165 | chunk_size_show(mddev_t *mddev, char *page) | |
2166 | { | |
2167 | return sprintf(page, "%d\n", mddev->chunk_size); | |
2168 | } | |
2169 | ||
2170 | static ssize_t | |
2171 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2172 | { | |
2173 | /* can only set chunk_size if array is not yet active */ | |
2174 | char *e; | |
2175 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2176 | ||
2177 | if (mddev->pers) | |
2178 | return -EBUSY; | |
2179 | if (!*buf || (*e && *e != '\n')) | |
2180 | return -EINVAL; | |
2181 | ||
2182 | mddev->chunk_size = n; | |
2183 | return len; | |
2184 | } | |
2185 | static struct md_sysfs_entry md_chunk_size = | |
2186 | __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store); | |
2187 | ||
6d7ff738 N |
2188 | static ssize_t |
2189 | null_show(mddev_t *mddev, char *page) | |
2190 | { | |
2191 | return -EINVAL; | |
2192 | } | |
2193 | ||
2194 | static ssize_t | |
2195 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2196 | { | |
2197 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2198 | /* The new device is added to the array. | |
2199 | * If the array has a persistent superblock, we read the | |
2200 | * superblock to initialise info and check validity. | |
2201 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2202 | * which mainly checks size. | |
2203 | */ | |
2204 | char *e; | |
2205 | int major = simple_strtoul(buf, &e, 10); | |
2206 | int minor; | |
2207 | dev_t dev; | |
2208 | mdk_rdev_t *rdev; | |
2209 | int err; | |
2210 | ||
2211 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2212 | return -EINVAL; | |
2213 | minor = simple_strtoul(e+1, &e, 10); | |
2214 | if (*e && *e != '\n') | |
2215 | return -EINVAL; | |
2216 | dev = MKDEV(major, minor); | |
2217 | if (major != MAJOR(dev) || | |
2218 | minor != MINOR(dev)) | |
2219 | return -EOVERFLOW; | |
2220 | ||
2221 | ||
2222 | if (mddev->persistent) { | |
2223 | rdev = md_import_device(dev, mddev->major_version, | |
2224 | mddev->minor_version); | |
2225 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2226 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2227 | mdk_rdev_t, same_set); | |
2228 | err = super_types[mddev->major_version] | |
2229 | .load_super(rdev, rdev0, mddev->minor_version); | |
2230 | if (err < 0) | |
2231 | goto out; | |
2232 | } | |
2233 | } else | |
2234 | rdev = md_import_device(dev, -1, -1); | |
2235 | ||
2236 | if (IS_ERR(rdev)) | |
2237 | return PTR_ERR(rdev); | |
2238 | err = bind_rdev_to_array(rdev, mddev); | |
2239 | out: | |
2240 | if (err) | |
2241 | export_rdev(rdev); | |
2242 | return err ? err : len; | |
2243 | } | |
2244 | ||
2245 | static struct md_sysfs_entry md_new_device = | |
2246 | __ATTR(new_dev, 0200, null_show, new_dev_store); | |
3b34380a | 2247 | |
a35b0d69 N |
2248 | static ssize_t |
2249 | size_show(mddev_t *mddev, char *page) | |
2250 | { | |
2251 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2252 | } | |
2253 | ||
2254 | static int update_size(mddev_t *mddev, unsigned long size); | |
2255 | ||
2256 | static ssize_t | |
2257 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2258 | { | |
2259 | /* If array is inactive, we can reduce the component size, but | |
2260 | * not increase it (except from 0). | |
2261 | * If array is active, we can try an on-line resize | |
2262 | */ | |
2263 | char *e; | |
2264 | int err = 0; | |
2265 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2266 | if (!*buf || *buf == '\n' || | |
2267 | (*e && *e != '\n')) | |
2268 | return -EINVAL; | |
2269 | ||
2270 | if (mddev->pers) { | |
2271 | err = update_size(mddev, size); | |
2272 | md_update_sb(mddev); | |
2273 | } else { | |
2274 | if (mddev->size == 0 || | |
2275 | mddev->size > size) | |
2276 | mddev->size = size; | |
2277 | else | |
2278 | err = -ENOSPC; | |
2279 | } | |
2280 | return err ? err : len; | |
2281 | } | |
2282 | ||
2283 | static struct md_sysfs_entry md_size = | |
2284 | __ATTR(component_size, 0644, size_show, size_store); | |
2285 | ||
8bb93aac N |
2286 | |
2287 | /* Metdata version. | |
2288 | * This is either 'none' for arrays with externally managed metadata, | |
2289 | * or N.M for internally known formats | |
2290 | */ | |
2291 | static ssize_t | |
2292 | metadata_show(mddev_t *mddev, char *page) | |
2293 | { | |
2294 | if (mddev->persistent) | |
2295 | return sprintf(page, "%d.%d\n", | |
2296 | mddev->major_version, mddev->minor_version); | |
2297 | else | |
2298 | return sprintf(page, "none\n"); | |
2299 | } | |
2300 | ||
2301 | static ssize_t | |
2302 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2303 | { | |
2304 | int major, minor; | |
2305 | char *e; | |
2306 | if (!list_empty(&mddev->disks)) | |
2307 | return -EBUSY; | |
2308 | ||
2309 | if (cmd_match(buf, "none")) { | |
2310 | mddev->persistent = 0; | |
2311 | mddev->major_version = 0; | |
2312 | mddev->minor_version = 90; | |
2313 | return len; | |
2314 | } | |
2315 | major = simple_strtoul(buf, &e, 10); | |
2316 | if (e==buf || *e != '.') | |
2317 | return -EINVAL; | |
2318 | buf = e+1; | |
2319 | minor = simple_strtoul(buf, &e, 10); | |
2320 | if (e==buf || *e != '\n') | |
2321 | return -EINVAL; | |
2322 | if (major >= sizeof(super_types)/sizeof(super_types[0]) || | |
2323 | super_types[major].name == NULL) | |
2324 | return -ENOENT; | |
2325 | mddev->major_version = major; | |
2326 | mddev->minor_version = minor; | |
2327 | mddev->persistent = 1; | |
2328 | return len; | |
2329 | } | |
2330 | ||
2331 | static struct md_sysfs_entry md_metadata = | |
2332 | __ATTR(metadata_version, 0644, metadata_show, metadata_store); | |
2333 | ||
24dd469d | 2334 | static ssize_t |
7eec314d | 2335 | action_show(mddev_t *mddev, char *page) |
24dd469d | 2336 | { |
7eec314d | 2337 | char *type = "idle"; |
31399d9e N |
2338 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2339 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { | |
ccfcc3c1 N |
2340 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
2341 | type = "reshape"; | |
2342 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2343 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2344 | type = "resync"; | |
2345 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2346 | type = "check"; | |
2347 | else | |
2348 | type = "repair"; | |
2349 | } else | |
2350 | type = "recover"; | |
2351 | } | |
2352 | return sprintf(page, "%s\n", type); | |
2353 | } | |
2354 | ||
2355 | static ssize_t | |
7eec314d | 2356 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 2357 | { |
7eec314d N |
2358 | if (!mddev->pers || !mddev->pers->sync_request) |
2359 | return -EINVAL; | |
2360 | ||
bce74dac | 2361 | if (cmd_match(page, "idle")) { |
7eec314d N |
2362 | if (mddev->sync_thread) { |
2363 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2364 | md_unregister_thread(mddev->sync_thread); | |
2365 | mddev->sync_thread = NULL; | |
2366 | mddev->recovery = 0; | |
2367 | } | |
03c902e1 N |
2368 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2369 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 2370 | return -EBUSY; |
03c902e1 | 2371 | else if (cmd_match(page, "resync") || cmd_match(page, "recover")) |
7eec314d | 2372 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
16484bf5 N |
2373 | else if (cmd_match(page, "reshape")) { |
2374 | int err; | |
2375 | if (mddev->pers->start_reshape == NULL) | |
2376 | return -EINVAL; | |
2377 | err = mddev->pers->start_reshape(mddev); | |
2378 | if (err) | |
2379 | return err; | |
2380 | } else { | |
bce74dac | 2381 | if (cmd_match(page, "check")) |
7eec314d | 2382 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 2383 | else if (!cmd_match(page, "repair")) |
7eec314d N |
2384 | return -EINVAL; |
2385 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
2386 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 2387 | } |
03c902e1 | 2388 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d N |
2389 | md_wakeup_thread(mddev->thread); |
2390 | return len; | |
2391 | } | |
2392 | ||
9d88883e | 2393 | static ssize_t |
96de1e66 | 2394 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
2395 | { |
2396 | return sprintf(page, "%llu\n", | |
2397 | (unsigned long long) mddev->resync_mismatches); | |
2398 | } | |
2399 | ||
96de1e66 | 2400 | static struct md_sysfs_entry |
7eec314d | 2401 | md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
24dd469d | 2402 | |
96de1e66 N |
2403 | |
2404 | static struct md_sysfs_entry | |
2405 | md_mismatches = __ATTR_RO(mismatch_cnt); | |
9d88883e | 2406 | |
88202a0c N |
2407 | static ssize_t |
2408 | sync_min_show(mddev_t *mddev, char *page) | |
2409 | { | |
2410 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
2411 | mddev->sync_speed_min ? "local": "system"); | |
2412 | } | |
2413 | ||
2414 | static ssize_t | |
2415 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
2416 | { | |
2417 | int min; | |
2418 | char *e; | |
2419 | if (strncmp(buf, "system", 6)==0) { | |
2420 | mddev->sync_speed_min = 0; | |
2421 | return len; | |
2422 | } | |
2423 | min = simple_strtoul(buf, &e, 10); | |
2424 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
2425 | return -EINVAL; | |
2426 | mddev->sync_speed_min = min; | |
2427 | return len; | |
2428 | } | |
2429 | ||
2430 | static struct md_sysfs_entry md_sync_min = | |
2431 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
2432 | ||
2433 | static ssize_t | |
2434 | sync_max_show(mddev_t *mddev, char *page) | |
2435 | { | |
2436 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
2437 | mddev->sync_speed_max ? "local": "system"); | |
2438 | } | |
2439 | ||
2440 | static ssize_t | |
2441 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
2442 | { | |
2443 | int max; | |
2444 | char *e; | |
2445 | if (strncmp(buf, "system", 6)==0) { | |
2446 | mddev->sync_speed_max = 0; | |
2447 | return len; | |
2448 | } | |
2449 | max = simple_strtoul(buf, &e, 10); | |
2450 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
2451 | return -EINVAL; | |
2452 | mddev->sync_speed_max = max; | |
2453 | return len; | |
2454 | } | |
2455 | ||
2456 | static struct md_sysfs_entry md_sync_max = | |
2457 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
2458 | ||
2459 | ||
2460 | static ssize_t | |
2461 | sync_speed_show(mddev_t *mddev, char *page) | |
2462 | { | |
2463 | unsigned long resync, dt, db; | |
2464 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
2465 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
2466 | if (!dt) dt++; | |
2467 | db = resync - (mddev->resync_mark_cnt); | |
2468 | return sprintf(page, "%ld\n", db/dt/2); /* K/sec */ | |
2469 | } | |
2470 | ||
2471 | static struct md_sysfs_entry | |
2472 | md_sync_speed = __ATTR_RO(sync_speed); | |
2473 | ||
2474 | static ssize_t | |
2475 | sync_completed_show(mddev_t *mddev, char *page) | |
2476 | { | |
2477 | unsigned long max_blocks, resync; | |
2478 | ||
2479 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
2480 | max_blocks = mddev->resync_max_sectors; | |
2481 | else | |
2482 | max_blocks = mddev->size << 1; | |
2483 | ||
2484 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
2485 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
2486 | } | |
2487 | ||
2488 | static struct md_sysfs_entry | |
2489 | md_sync_completed = __ATTR_RO(sync_completed); | |
2490 | ||
e464eafd N |
2491 | static ssize_t |
2492 | suspend_lo_show(mddev_t *mddev, char *page) | |
2493 | { | |
2494 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
2495 | } | |
2496 | ||
2497 | static ssize_t | |
2498 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
2499 | { | |
2500 | char *e; | |
2501 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
2502 | ||
2503 | if (mddev->pers->quiesce == NULL) | |
2504 | return -EINVAL; | |
2505 | if (buf == e || (*e && *e != '\n')) | |
2506 | return -EINVAL; | |
2507 | if (new >= mddev->suspend_hi || | |
2508 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
2509 | mddev->suspend_lo = new; | |
2510 | mddev->pers->quiesce(mddev, 2); | |
2511 | return len; | |
2512 | } else | |
2513 | return -EINVAL; | |
2514 | } | |
2515 | static struct md_sysfs_entry md_suspend_lo = | |
2516 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
2517 | ||
2518 | ||
2519 | static ssize_t | |
2520 | suspend_hi_show(mddev_t *mddev, char *page) | |
2521 | { | |
2522 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
2523 | } | |
2524 | ||
2525 | static ssize_t | |
2526 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
2527 | { | |
2528 | char *e; | |
2529 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
2530 | ||
2531 | if (mddev->pers->quiesce == NULL) | |
2532 | return -EINVAL; | |
2533 | if (buf == e || (*e && *e != '\n')) | |
2534 | return -EINVAL; | |
2535 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
2536 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
2537 | mddev->suspend_hi = new; | |
2538 | mddev->pers->quiesce(mddev, 1); | |
2539 | mddev->pers->quiesce(mddev, 0); | |
2540 | return len; | |
2541 | } else | |
2542 | return -EINVAL; | |
2543 | } | |
2544 | static struct md_sysfs_entry md_suspend_hi = | |
2545 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
2546 | ||
2547 | ||
eae1701f N |
2548 | static struct attribute *md_default_attrs[] = { |
2549 | &md_level.attr, | |
2550 | &md_raid_disks.attr, | |
3b34380a | 2551 | &md_chunk_size.attr, |
a35b0d69 | 2552 | &md_size.attr, |
8bb93aac | 2553 | &md_metadata.attr, |
6d7ff738 | 2554 | &md_new_device.attr, |
16f17b39 | 2555 | &md_safe_delay.attr, |
411036fa N |
2556 | NULL, |
2557 | }; | |
2558 | ||
2559 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 2560 | &md_scan_mode.attr, |
9d88883e | 2561 | &md_mismatches.attr, |
88202a0c N |
2562 | &md_sync_min.attr, |
2563 | &md_sync_max.attr, | |
2564 | &md_sync_speed.attr, | |
2565 | &md_sync_completed.attr, | |
e464eafd N |
2566 | &md_suspend_lo.attr, |
2567 | &md_suspend_hi.attr, | |
eae1701f N |
2568 | NULL, |
2569 | }; | |
411036fa N |
2570 | static struct attribute_group md_redundancy_group = { |
2571 | .name = NULL, | |
2572 | .attrs = md_redundancy_attrs, | |
2573 | }; | |
2574 | ||
eae1701f N |
2575 | |
2576 | static ssize_t | |
2577 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2578 | { | |
2579 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
2580 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 2581 | ssize_t rv; |
eae1701f N |
2582 | |
2583 | if (!entry->show) | |
2584 | return -EIO; | |
5dc5cf7d IM |
2585 | rv = mddev_lock(mddev); |
2586 | if (!rv) { | |
2587 | rv = entry->show(mddev, page); | |
2588 | mddev_unlock(mddev); | |
2589 | } | |
96de1e66 | 2590 | return rv; |
eae1701f N |
2591 | } |
2592 | ||
2593 | static ssize_t | |
2594 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
2595 | const char *page, size_t length) | |
2596 | { | |
2597 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
2598 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 2599 | ssize_t rv; |
eae1701f N |
2600 | |
2601 | if (!entry->store) | |
2602 | return -EIO; | |
5dc5cf7d IM |
2603 | rv = mddev_lock(mddev); |
2604 | if (!rv) { | |
2605 | rv = entry->store(mddev, page, length); | |
2606 | mddev_unlock(mddev); | |
2607 | } | |
96de1e66 | 2608 | return rv; |
eae1701f N |
2609 | } |
2610 | ||
2611 | static void md_free(struct kobject *ko) | |
2612 | { | |
2613 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
2614 | kfree(mddev); | |
2615 | } | |
2616 | ||
2617 | static struct sysfs_ops md_sysfs_ops = { | |
2618 | .show = md_attr_show, | |
2619 | .store = md_attr_store, | |
2620 | }; | |
2621 | static struct kobj_type md_ktype = { | |
2622 | .release = md_free, | |
2623 | .sysfs_ops = &md_sysfs_ops, | |
2624 | .default_attrs = md_default_attrs, | |
2625 | }; | |
2626 | ||
1da177e4 LT |
2627 | int mdp_major = 0; |
2628 | ||
2629 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
2630 | { | |
48c9c27b | 2631 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
2632 | mddev_t *mddev = mddev_find(dev); |
2633 | struct gendisk *disk; | |
2634 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
2635 | int shift = partitioned ? MdpMinorShift : 0; | |
2636 | int unit = MINOR(dev) >> shift; | |
2637 | ||
2638 | if (!mddev) | |
2639 | return NULL; | |
2640 | ||
48c9c27b | 2641 | mutex_lock(&disks_mutex); |
1da177e4 | 2642 | if (mddev->gendisk) { |
48c9c27b | 2643 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
2644 | mddev_put(mddev); |
2645 | return NULL; | |
2646 | } | |
2647 | disk = alloc_disk(1 << shift); | |
2648 | if (!disk) { | |
48c9c27b | 2649 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
2650 | mddev_put(mddev); |
2651 | return NULL; | |
2652 | } | |
2653 | disk->major = MAJOR(dev); | |
2654 | disk->first_minor = unit << shift; | |
2655 | if (partitioned) { | |
2656 | sprintf(disk->disk_name, "md_d%d", unit); | |
2657 | sprintf(disk->devfs_name, "md/d%d", unit); | |
2658 | } else { | |
2659 | sprintf(disk->disk_name, "md%d", unit); | |
2660 | sprintf(disk->devfs_name, "md/%d", unit); | |
2661 | } | |
2662 | disk->fops = &md_fops; | |
2663 | disk->private_data = mddev; | |
2664 | disk->queue = mddev->queue; | |
2665 | add_disk(disk); | |
2666 | mddev->gendisk = disk; | |
48c9c27b | 2667 | mutex_unlock(&disks_mutex); |
9c791977 | 2668 | mddev->kobj.parent = &disk->kobj; |
eae1701f N |
2669 | mddev->kobj.k_name = NULL; |
2670 | snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); | |
2671 | mddev->kobj.ktype = &md_ktype; | |
2672 | kobject_register(&mddev->kobj); | |
1da177e4 LT |
2673 | return NULL; |
2674 | } | |
2675 | ||
1da177e4 LT |
2676 | static void md_safemode_timeout(unsigned long data) |
2677 | { | |
2678 | mddev_t *mddev = (mddev_t *) data; | |
2679 | ||
2680 | mddev->safemode = 1; | |
2681 | md_wakeup_thread(mddev->thread); | |
2682 | } | |
2683 | ||
6ff8d8ec | 2684 | static int start_dirty_degraded; |
1da177e4 LT |
2685 | |
2686 | static int do_md_run(mddev_t * mddev) | |
2687 | { | |
2604b703 | 2688 | int err; |
1da177e4 LT |
2689 | int chunk_size; |
2690 | struct list_head *tmp; | |
2691 | mdk_rdev_t *rdev; | |
2692 | struct gendisk *disk; | |
2604b703 | 2693 | struct mdk_personality *pers; |
1da177e4 LT |
2694 | char b[BDEVNAME_SIZE]; |
2695 | ||
a757e64c N |
2696 | if (list_empty(&mddev->disks)) |
2697 | /* cannot run an array with no devices.. */ | |
1da177e4 | 2698 | return -EINVAL; |
1da177e4 LT |
2699 | |
2700 | if (mddev->pers) | |
2701 | return -EBUSY; | |
2702 | ||
2703 | /* | |
2704 | * Analyze all RAID superblock(s) | |
2705 | */ | |
a757e64c N |
2706 | if (!mddev->raid_disks) |
2707 | analyze_sbs(mddev); | |
1da177e4 LT |
2708 | |
2709 | chunk_size = mddev->chunk_size; | |
2604b703 N |
2710 | |
2711 | if (chunk_size) { | |
1da177e4 LT |
2712 | if (chunk_size > MAX_CHUNK_SIZE) { |
2713 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
2714 | chunk_size, MAX_CHUNK_SIZE); | |
2715 | return -EINVAL; | |
2716 | } | |
2717 | /* | |
2718 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
2719 | */ | |
2720 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 2721 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
2722 | return -EINVAL; |
2723 | } | |
2724 | if (chunk_size < PAGE_SIZE) { | |
2725 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
2726 | chunk_size, PAGE_SIZE); | |
2727 | return -EINVAL; | |
2728 | } | |
2729 | ||
2730 | /* devices must have minimum size of one chunk */ | |
2731 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2732 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2733 | continue; |
2734 | if (rdev->size < chunk_size / 1024) { | |
2735 | printk(KERN_WARNING | |
2736 | "md: Dev %s smaller than chunk_size:" | |
2737 | " %lluk < %dk\n", | |
2738 | bdevname(rdev->bdev,b), | |
2739 | (unsigned long long)rdev->size, | |
2740 | chunk_size / 1024); | |
2741 | return -EINVAL; | |
2742 | } | |
2743 | } | |
2744 | } | |
2745 | ||
1da177e4 | 2746 | #ifdef CONFIG_KMOD |
d9d166c2 N |
2747 | if (mddev->level != LEVEL_NONE) |
2748 | request_module("md-level-%d", mddev->level); | |
2749 | else if (mddev->clevel[0]) | |
2750 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
2751 | #endif |
2752 | ||
2753 | /* | |
2754 | * Drop all container device buffers, from now on | |
2755 | * the only valid external interface is through the md | |
2756 | * device. | |
2757 | * Also find largest hardsector size | |
2758 | */ | |
2759 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2760 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2761 | continue; |
2762 | sync_blockdev(rdev->bdev); | |
2763 | invalidate_bdev(rdev->bdev, 0); | |
2764 | } | |
2765 | ||
2766 | md_probe(mddev->unit, NULL, NULL); | |
2767 | disk = mddev->gendisk; | |
2768 | if (!disk) | |
2769 | return -ENOMEM; | |
2770 | ||
2771 | spin_lock(&pers_lock); | |
d9d166c2 | 2772 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 2773 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 2774 | spin_unlock(&pers_lock); |
d9d166c2 N |
2775 | if (mddev->level != LEVEL_NONE) |
2776 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
2777 | mddev->level); | |
2778 | else | |
2779 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
2780 | mddev->clevel); | |
1da177e4 LT |
2781 | return -EINVAL; |
2782 | } | |
2604b703 | 2783 | mddev->pers = pers; |
1da177e4 | 2784 | spin_unlock(&pers_lock); |
d9d166c2 N |
2785 | mddev->level = pers->level; |
2786 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 2787 | |
f6705578 | 2788 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 2789 | pers->start_reshape == NULL) { |
f6705578 N |
2790 | /* This personality cannot handle reshaping... */ |
2791 | mddev->pers = NULL; | |
2792 | module_put(pers->owner); | |
2793 | return -EINVAL; | |
2794 | } | |
2795 | ||
657390d2 | 2796 | mddev->recovery = 0; |
1da177e4 | 2797 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 2798 | mddev->barriers_work = 1; |
6ff8d8ec | 2799 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 2800 | |
f91de92e N |
2801 | if (start_readonly) |
2802 | mddev->ro = 2; /* read-only, but switch on first write */ | |
2803 | ||
b15c2e57 N |
2804 | err = mddev->pers->run(mddev); |
2805 | if (!err && mddev->pers->sync_request) { | |
2806 | err = bitmap_create(mddev); | |
2807 | if (err) { | |
2808 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
2809 | mdname(mddev), err); | |
2810 | mddev->pers->stop(mddev); | |
2811 | } | |
2812 | } | |
1da177e4 LT |
2813 | if (err) { |
2814 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
2815 | module_put(mddev->pers->owner); | |
2816 | mddev->pers = NULL; | |
32a7627c N |
2817 | bitmap_destroy(mddev); |
2818 | return err; | |
1da177e4 | 2819 | } |
411036fa N |
2820 | if (mddev->pers->sync_request) |
2821 | sysfs_create_group(&mddev->kobj, &md_redundancy_group); | |
fd9d49ca N |
2822 | else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
2823 | mddev->ro = 0; | |
2824 | ||
1da177e4 LT |
2825 | atomic_set(&mddev->writes_pending,0); |
2826 | mddev->safemode = 0; | |
2827 | mddev->safemode_timer.function = md_safemode_timeout; | |
2828 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 2829 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 2830 | mddev->in_sync = 1; |
86e6ffdd N |
2831 | |
2832 | ITERATE_RDEV(mddev,rdev,tmp) | |
2833 | if (rdev->raid_disk >= 0) { | |
2834 | char nm[20]; | |
2835 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2836 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
2837 | } | |
1da177e4 LT |
2838 | |
2839 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2840 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2841 | |
2842 | if (mddev->sb_dirty) | |
2843 | md_update_sb(mddev); | |
2844 | ||
2845 | set_capacity(disk, mddev->array_size<<1); | |
2846 | ||
2847 | /* If we call blk_queue_make_request here, it will | |
2848 | * re-initialise max_sectors etc which may have been | |
2849 | * refined inside -> run. So just set the bits we need to set. | |
2850 | * Most initialisation happended when we called | |
2851 | * blk_queue_make_request(..., md_fail_request) | |
2852 | * earlier. | |
2853 | */ | |
2854 | mddev->queue->queuedata = mddev; | |
2855 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
2856 | ||
5fd6c1dc N |
2857 | /* If there is a partially-recovered drive we need to |
2858 | * start recovery here. If we leave it to md_check_recovery, | |
2859 | * it will remove the drives and not do the right thing | |
2860 | */ | |
2861 | if (mddev->degraded) { | |
2862 | struct list_head *rtmp; | |
2863 | int spares = 0; | |
2864 | ITERATE_RDEV(mddev,rdev,rtmp) | |
2865 | if (rdev->raid_disk >= 0 && | |
2866 | !test_bit(In_sync, &rdev->flags) && | |
2867 | !test_bit(Faulty, &rdev->flags)) | |
2868 | /* complete an interrupted recovery */ | |
2869 | spares++; | |
2870 | if (spares && mddev->pers->sync_request) { | |
2871 | mddev->recovery = 0; | |
2872 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
2873 | mddev->sync_thread = md_register_thread(md_do_sync, | |
2874 | mddev, | |
2875 | "%s_resync"); | |
2876 | if (!mddev->sync_thread) { | |
2877 | printk(KERN_ERR "%s: could not start resync" | |
2878 | " thread...\n", | |
2879 | mdname(mddev)); | |
2880 | /* leave the spares where they are, it shouldn't hurt */ | |
2881 | mddev->recovery = 0; | |
2882 | } else | |
2883 | md_wakeup_thread(mddev->sync_thread); | |
2884 | } | |
2885 | } | |
2886 | ||
1da177e4 | 2887 | mddev->changed = 1; |
d7603b7e | 2888 | md_new_event(mddev); |
1da177e4 LT |
2889 | return 0; |
2890 | } | |
2891 | ||
2892 | static int restart_array(mddev_t *mddev) | |
2893 | { | |
2894 | struct gendisk *disk = mddev->gendisk; | |
2895 | int err; | |
2896 | ||
2897 | /* | |
2898 | * Complain if it has no devices | |
2899 | */ | |
2900 | err = -ENXIO; | |
2901 | if (list_empty(&mddev->disks)) | |
2902 | goto out; | |
2903 | ||
2904 | if (mddev->pers) { | |
2905 | err = -EBUSY; | |
2906 | if (!mddev->ro) | |
2907 | goto out; | |
2908 | ||
2909 | mddev->safemode = 0; | |
2910 | mddev->ro = 0; | |
2911 | set_disk_ro(disk, 0); | |
2912 | ||
2913 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
2914 | mdname(mddev)); | |
2915 | /* | |
2916 | * Kick recovery or resync if necessary | |
2917 | */ | |
2918 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2919 | md_wakeup_thread(mddev->thread); | |
5fd6c1dc | 2920 | md_wakeup_thread(mddev->sync_thread); |
1da177e4 LT |
2921 | err = 0; |
2922 | } else { | |
2923 | printk(KERN_ERR "md: %s has no personality assigned.\n", | |
2924 | mdname(mddev)); | |
2925 | err = -EINVAL; | |
2926 | } | |
2927 | ||
2928 | out: | |
2929 | return err; | |
2930 | } | |
2931 | ||
acc55e22 N |
2932 | /* similar to deny_write_access, but accounts for our holding a reference |
2933 | * to the file ourselves */ | |
2934 | static int deny_bitmap_write_access(struct file * file) | |
2935 | { | |
2936 | struct inode *inode = file->f_mapping->host; | |
2937 | ||
2938 | spin_lock(&inode->i_lock); | |
2939 | if (atomic_read(&inode->i_writecount) > 1) { | |
2940 | spin_unlock(&inode->i_lock); | |
2941 | return -ETXTBSY; | |
2942 | } | |
2943 | atomic_set(&inode->i_writecount, -1); | |
2944 | spin_unlock(&inode->i_lock); | |
2945 | ||
2946 | return 0; | |
2947 | } | |
2948 | ||
2949 | static void restore_bitmap_write_access(struct file *file) | |
2950 | { | |
2951 | struct inode *inode = file->f_mapping->host; | |
2952 | ||
2953 | spin_lock(&inode->i_lock); | |
2954 | atomic_set(&inode->i_writecount, 1); | |
2955 | spin_unlock(&inode->i_lock); | |
2956 | } | |
2957 | ||
1da177e4 LT |
2958 | static int do_md_stop(mddev_t * mddev, int ro) |
2959 | { | |
2960 | int err = 0; | |
2961 | struct gendisk *disk = mddev->gendisk; | |
2962 | ||
2963 | if (mddev->pers) { | |
2964 | if (atomic_read(&mddev->active)>2) { | |
2965 | printk("md: %s still in use.\n",mdname(mddev)); | |
2966 | return -EBUSY; | |
2967 | } | |
2968 | ||
2969 | if (mddev->sync_thread) { | |
5fd6c1dc | 2970 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
2971 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
2972 | md_unregister_thread(mddev->sync_thread); | |
2973 | mddev->sync_thread = NULL; | |
2974 | } | |
2975 | ||
2976 | del_timer_sync(&mddev->safemode_timer); | |
2977 | ||
2978 | invalidate_partition(disk, 0); | |
2979 | ||
2980 | if (ro) { | |
2981 | err = -ENXIO; | |
f91de92e | 2982 | if (mddev->ro==1) |
1da177e4 LT |
2983 | goto out; |
2984 | mddev->ro = 1; | |
2985 | } else { | |
6b8b3e8a | 2986 | bitmap_flush(mddev); |
a9701a30 | 2987 | md_super_wait(mddev); |
1da177e4 LT |
2988 | if (mddev->ro) |
2989 | set_disk_ro(disk, 0); | |
2990 | blk_queue_make_request(mddev->queue, md_fail_request); | |
2991 | mddev->pers->stop(mddev); | |
411036fa N |
2992 | if (mddev->pers->sync_request) |
2993 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
2994 | ||
1da177e4 LT |
2995 | module_put(mddev->pers->owner); |
2996 | mddev->pers = NULL; | |
2997 | if (mddev->ro) | |
2998 | mddev->ro = 0; | |
2999 | } | |
5fd6c1dc | 3000 | if (!mddev->in_sync || mddev->sb_dirty) { |
1da177e4 LT |
3001 | /* mark array as shutdown cleanly */ |
3002 | mddev->in_sync = 1; | |
3003 | md_update_sb(mddev); | |
3004 | } | |
3005 | if (ro) | |
3006 | set_disk_ro(disk, 1); | |
5fd6c1dc | 3007 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3008 | } |
32a7627c | 3009 | |
1da177e4 LT |
3010 | /* |
3011 | * Free resources if final stop | |
3012 | */ | |
3013 | if (!ro) { | |
86e6ffdd N |
3014 | mdk_rdev_t *rdev; |
3015 | struct list_head *tmp; | |
1da177e4 LT |
3016 | struct gendisk *disk; |
3017 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); | |
3018 | ||
978f946b N |
3019 | bitmap_destroy(mddev); |
3020 | if (mddev->bitmap_file) { | |
acc55e22 | 3021 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3022 | fput(mddev->bitmap_file); |
3023 | mddev->bitmap_file = NULL; | |
3024 | } | |
3025 | mddev->bitmap_offset = 0; | |
3026 | ||
86e6ffdd N |
3027 | ITERATE_RDEV(mddev,rdev,tmp) |
3028 | if (rdev->raid_disk >= 0) { | |
3029 | char nm[20]; | |
3030 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3031 | sysfs_remove_link(&mddev->kobj, nm); | |
3032 | } | |
3033 | ||
1da177e4 LT |
3034 | export_array(mddev); |
3035 | ||
3036 | mddev->array_size = 0; | |
3037 | disk = mddev->gendisk; | |
3038 | if (disk) | |
3039 | set_capacity(disk, 0); | |
3040 | mddev->changed = 1; | |
a8a55c38 | 3041 | } else if (mddev->pers) |
1da177e4 LT |
3042 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
3043 | mdname(mddev)); | |
3044 | err = 0; | |
d7603b7e | 3045 | md_new_event(mddev); |
1da177e4 LT |
3046 | out: |
3047 | return err; | |
3048 | } | |
3049 | ||
3050 | static void autorun_array(mddev_t *mddev) | |
3051 | { | |
3052 | mdk_rdev_t *rdev; | |
3053 | struct list_head *tmp; | |
3054 | int err; | |
3055 | ||
a757e64c | 3056 | if (list_empty(&mddev->disks)) |
1da177e4 | 3057 | return; |
1da177e4 LT |
3058 | |
3059 | printk(KERN_INFO "md: running: "); | |
3060 | ||
3061 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3062 | char b[BDEVNAME_SIZE]; | |
3063 | printk("<%s>", bdevname(rdev->bdev,b)); | |
3064 | } | |
3065 | printk("\n"); | |
3066 | ||
3067 | err = do_md_run (mddev); | |
3068 | if (err) { | |
3069 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
3070 | do_md_stop (mddev, 0); | |
3071 | } | |
3072 | } | |
3073 | ||
3074 | /* | |
3075 | * lets try to run arrays based on all disks that have arrived | |
3076 | * until now. (those are in pending_raid_disks) | |
3077 | * | |
3078 | * the method: pick the first pending disk, collect all disks with | |
3079 | * the same UUID, remove all from the pending list and put them into | |
3080 | * the 'same_array' list. Then order this list based on superblock | |
3081 | * update time (freshest comes first), kick out 'old' disks and | |
3082 | * compare superblocks. If everything's fine then run it. | |
3083 | * | |
3084 | * If "unit" is allocated, then bump its reference count | |
3085 | */ | |
3086 | static void autorun_devices(int part) | |
3087 | { | |
1da177e4 LT |
3088 | struct list_head *tmp; |
3089 | mdk_rdev_t *rdev0, *rdev; | |
3090 | mddev_t *mddev; | |
3091 | char b[BDEVNAME_SIZE]; | |
3092 | ||
3093 | printk(KERN_INFO "md: autorun ...\n"); | |
3094 | while (!list_empty(&pending_raid_disks)) { | |
3095 | dev_t dev; | |
ad01c9e3 | 3096 | LIST_HEAD(candidates); |
1da177e4 LT |
3097 | rdev0 = list_entry(pending_raid_disks.next, |
3098 | mdk_rdev_t, same_set); | |
3099 | ||
3100 | printk(KERN_INFO "md: considering %s ...\n", | |
3101 | bdevname(rdev0->bdev,b)); | |
3102 | INIT_LIST_HEAD(&candidates); | |
3103 | ITERATE_RDEV_PENDING(rdev,tmp) | |
3104 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
3105 | printk(KERN_INFO "md: adding %s ...\n", | |
3106 | bdevname(rdev->bdev,b)); | |
3107 | list_move(&rdev->same_set, &candidates); | |
3108 | } | |
3109 | /* | |
3110 | * now we have a set of devices, with all of them having | |
3111 | * mostly sane superblocks. It's time to allocate the | |
3112 | * mddev. | |
3113 | */ | |
3114 | if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { | |
3115 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", | |
3116 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
3117 | break; | |
3118 | } | |
3119 | if (part) | |
3120 | dev = MKDEV(mdp_major, | |
3121 | rdev0->preferred_minor << MdpMinorShift); | |
3122 | else | |
3123 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
3124 | ||
3125 | md_probe(dev, NULL, NULL); | |
3126 | mddev = mddev_find(dev); | |
3127 | if (!mddev) { | |
3128 | printk(KERN_ERR | |
3129 | "md: cannot allocate memory for md drive.\n"); | |
3130 | break; | |
3131 | } | |
3132 | if (mddev_lock(mddev)) | |
3133 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
3134 | mdname(mddev)); | |
3135 | else if (mddev->raid_disks || mddev->major_version | |
3136 | || !list_empty(&mddev->disks)) { | |
3137 | printk(KERN_WARNING | |
3138 | "md: %s already running, cannot run %s\n", | |
3139 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
3140 | mddev_unlock(mddev); | |
3141 | } else { | |
3142 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
3143 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
3144 | list_del_init(&rdev->same_set); | |
3145 | if (bind_rdev_to_array(rdev, mddev)) | |
3146 | export_rdev(rdev); | |
3147 | } | |
3148 | autorun_array(mddev); | |
3149 | mddev_unlock(mddev); | |
3150 | } | |
3151 | /* on success, candidates will be empty, on error | |
3152 | * it won't... | |
3153 | */ | |
3154 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
3155 | export_rdev(rdev); | |
3156 | mddev_put(mddev); | |
3157 | } | |
3158 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
3159 | } | |
3160 | ||
3161 | /* | |
3162 | * import RAID devices based on one partition | |
3163 | * if possible, the array gets run as well. | |
3164 | */ | |
3165 | ||
3166 | static int autostart_array(dev_t startdev) | |
3167 | { | |
3168 | char b[BDEVNAME_SIZE]; | |
3169 | int err = -EINVAL, i; | |
3170 | mdp_super_t *sb = NULL; | |
3171 | mdk_rdev_t *start_rdev = NULL, *rdev; | |
3172 | ||
3173 | start_rdev = md_import_device(startdev, 0, 0); | |
3174 | if (IS_ERR(start_rdev)) | |
3175 | return err; | |
3176 | ||
3177 | ||
3178 | /* NOTE: this can only work for 0.90.0 superblocks */ | |
3179 | sb = (mdp_super_t*)page_address(start_rdev->sb_page); | |
3180 | if (sb->major_version != 0 || | |
3181 | sb->minor_version != 90 ) { | |
3182 | printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); | |
3183 | export_rdev(start_rdev); | |
3184 | return err; | |
3185 | } | |
3186 | ||
b2d444d7 | 3187 | if (test_bit(Faulty, &start_rdev->flags)) { |
1da177e4 LT |
3188 | printk(KERN_WARNING |
3189 | "md: can not autostart based on faulty %s!\n", | |
3190 | bdevname(start_rdev->bdev,b)); | |
3191 | export_rdev(start_rdev); | |
3192 | return err; | |
3193 | } | |
3194 | list_add(&start_rdev->same_set, &pending_raid_disks); | |
3195 | ||
3196 | for (i = 0; i < MD_SB_DISKS; i++) { | |
3197 | mdp_disk_t *desc = sb->disks + i; | |
3198 | dev_t dev = MKDEV(desc->major, desc->minor); | |
3199 | ||
3200 | if (!dev) | |
3201 | continue; | |
3202 | if (dev == startdev) | |
3203 | continue; | |
3204 | if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) | |
3205 | continue; | |
3206 | rdev = md_import_device(dev, 0, 0); | |
3207 | if (IS_ERR(rdev)) | |
3208 | continue; | |
3209 | ||
3210 | list_add(&rdev->same_set, &pending_raid_disks); | |
3211 | } | |
3212 | ||
3213 | /* | |
3214 | * possibly return codes | |
3215 | */ | |
3216 | autorun_devices(0); | |
3217 | return 0; | |
3218 | ||
3219 | } | |
3220 | ||
3221 | ||
3222 | static int get_version(void __user * arg) | |
3223 | { | |
3224 | mdu_version_t ver; | |
3225 | ||
3226 | ver.major = MD_MAJOR_VERSION; | |
3227 | ver.minor = MD_MINOR_VERSION; | |
3228 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
3229 | ||
3230 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
3231 | return -EFAULT; | |
3232 | ||
3233 | return 0; | |
3234 | } | |
3235 | ||
3236 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
3237 | { | |
3238 | mdu_array_info_t info; | |
3239 | int nr,working,active,failed,spare; | |
3240 | mdk_rdev_t *rdev; | |
3241 | struct list_head *tmp; | |
3242 | ||
3243 | nr=working=active=failed=spare=0; | |
3244 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3245 | nr++; | |
b2d444d7 | 3246 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3247 | failed++; |
3248 | else { | |
3249 | working++; | |
b2d444d7 | 3250 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
3251 | active++; |
3252 | else | |
3253 | spare++; | |
3254 | } | |
3255 | } | |
3256 | ||
3257 | info.major_version = mddev->major_version; | |
3258 | info.minor_version = mddev->minor_version; | |
3259 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
3260 | info.ctime = mddev->ctime; | |
3261 | info.level = mddev->level; | |
3262 | info.size = mddev->size; | |
284ae7ca N |
3263 | if (info.size != mddev->size) /* overflow */ |
3264 | info.size = -1; | |
1da177e4 LT |
3265 | info.nr_disks = nr; |
3266 | info.raid_disks = mddev->raid_disks; | |
3267 | info.md_minor = mddev->md_minor; | |
3268 | info.not_persistent= !mddev->persistent; | |
3269 | ||
3270 | info.utime = mddev->utime; | |
3271 | info.state = 0; | |
3272 | if (mddev->in_sync) | |
3273 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
3274 | if (mddev->bitmap && mddev->bitmap_offset) |
3275 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3276 | info.active_disks = active; |
3277 | info.working_disks = working; | |
3278 | info.failed_disks = failed; | |
3279 | info.spare_disks = spare; | |
3280 | ||
3281 | info.layout = mddev->layout; | |
3282 | info.chunk_size = mddev->chunk_size; | |
3283 | ||
3284 | if (copy_to_user(arg, &info, sizeof(info))) | |
3285 | return -EFAULT; | |
3286 | ||
3287 | return 0; | |
3288 | } | |
3289 | ||
87162a28 | 3290 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
3291 | { |
3292 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
3293 | char *ptr, *buf = NULL; | |
3294 | int err = -ENOMEM; | |
3295 | ||
3296 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
3297 | if (!file) | |
3298 | goto out; | |
3299 | ||
3300 | /* bitmap disabled, zero the first byte and copy out */ | |
3301 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
3302 | file->pathname[0] = '\0'; | |
3303 | goto copy_out; | |
3304 | } | |
3305 | ||
3306 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
3307 | if (!buf) | |
3308 | goto out; | |
3309 | ||
3310 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
3311 | if (!ptr) | |
3312 | goto out; | |
3313 | ||
3314 | strcpy(file->pathname, ptr); | |
3315 | ||
3316 | copy_out: | |
3317 | err = 0; | |
3318 | if (copy_to_user(arg, file, sizeof(*file))) | |
3319 | err = -EFAULT; | |
3320 | out: | |
3321 | kfree(buf); | |
3322 | kfree(file); | |
3323 | return err; | |
3324 | } | |
3325 | ||
1da177e4 LT |
3326 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
3327 | { | |
3328 | mdu_disk_info_t info; | |
3329 | unsigned int nr; | |
3330 | mdk_rdev_t *rdev; | |
3331 | ||
3332 | if (copy_from_user(&info, arg, sizeof(info))) | |
3333 | return -EFAULT; | |
3334 | ||
3335 | nr = info.number; | |
3336 | ||
3337 | rdev = find_rdev_nr(mddev, nr); | |
3338 | if (rdev) { | |
3339 | info.major = MAJOR(rdev->bdev->bd_dev); | |
3340 | info.minor = MINOR(rdev->bdev->bd_dev); | |
3341 | info.raid_disk = rdev->raid_disk; | |
3342 | info.state = 0; | |
b2d444d7 | 3343 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3344 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 3345 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
3346 | info.state |= (1<<MD_DISK_ACTIVE); |
3347 | info.state |= (1<<MD_DISK_SYNC); | |
3348 | } | |
8ddf9efe N |
3349 | if (test_bit(WriteMostly, &rdev->flags)) |
3350 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
3351 | } else { |
3352 | info.major = info.minor = 0; | |
3353 | info.raid_disk = -1; | |
3354 | info.state = (1<<MD_DISK_REMOVED); | |
3355 | } | |
3356 | ||
3357 | if (copy_to_user(arg, &info, sizeof(info))) | |
3358 | return -EFAULT; | |
3359 | ||
3360 | return 0; | |
3361 | } | |
3362 | ||
3363 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
3364 | { | |
3365 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3366 | mdk_rdev_t *rdev; | |
3367 | dev_t dev = MKDEV(info->major,info->minor); | |
3368 | ||
3369 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
3370 | return -EOVERFLOW; | |
3371 | ||
3372 | if (!mddev->raid_disks) { | |
3373 | int err; | |
3374 | /* expecting a device which has a superblock */ | |
3375 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
3376 | if (IS_ERR(rdev)) { | |
3377 | printk(KERN_WARNING | |
3378 | "md: md_import_device returned %ld\n", | |
3379 | PTR_ERR(rdev)); | |
3380 | return PTR_ERR(rdev); | |
3381 | } | |
3382 | if (!list_empty(&mddev->disks)) { | |
3383 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3384 | mdk_rdev_t, same_set); | |
3385 | int err = super_types[mddev->major_version] | |
3386 | .load_super(rdev, rdev0, mddev->minor_version); | |
3387 | if (err < 0) { | |
3388 | printk(KERN_WARNING | |
3389 | "md: %s has different UUID to %s\n", | |
3390 | bdevname(rdev->bdev,b), | |
3391 | bdevname(rdev0->bdev,b2)); | |
3392 | export_rdev(rdev); | |
3393 | return -EINVAL; | |
3394 | } | |
3395 | } | |
3396 | err = bind_rdev_to_array(rdev, mddev); | |
3397 | if (err) | |
3398 | export_rdev(rdev); | |
3399 | return err; | |
3400 | } | |
3401 | ||
3402 | /* | |
3403 | * add_new_disk can be used once the array is assembled | |
3404 | * to add "hot spares". They must already have a superblock | |
3405 | * written | |
3406 | */ | |
3407 | if (mddev->pers) { | |
3408 | int err; | |
3409 | if (!mddev->pers->hot_add_disk) { | |
3410 | printk(KERN_WARNING | |
3411 | "%s: personality does not support diskops!\n", | |
3412 | mdname(mddev)); | |
3413 | return -EINVAL; | |
3414 | } | |
7b1e35f6 N |
3415 | if (mddev->persistent) |
3416 | rdev = md_import_device(dev, mddev->major_version, | |
3417 | mddev->minor_version); | |
3418 | else | |
3419 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
3420 | if (IS_ERR(rdev)) { |
3421 | printk(KERN_WARNING | |
3422 | "md: md_import_device returned %ld\n", | |
3423 | PTR_ERR(rdev)); | |
3424 | return PTR_ERR(rdev); | |
3425 | } | |
41158c7e N |
3426 | /* set save_raid_disk if appropriate */ |
3427 | if (!mddev->persistent) { | |
3428 | if (info->state & (1<<MD_DISK_SYNC) && | |
3429 | info->raid_disk < mddev->raid_disks) | |
3430 | rdev->raid_disk = info->raid_disk; | |
3431 | else | |
3432 | rdev->raid_disk = -1; | |
3433 | } else | |
3434 | super_types[mddev->major_version]. | |
3435 | validate_super(mddev, rdev); | |
3436 | rdev->saved_raid_disk = rdev->raid_disk; | |
3437 | ||
b2d444d7 | 3438 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
3439 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
3440 | set_bit(WriteMostly, &rdev->flags); | |
3441 | ||
1da177e4 LT |
3442 | rdev->raid_disk = -1; |
3443 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
3444 | if (!err && !mddev->pers->hot_remove_disk) { |
3445 | /* If there is hot_add_disk but no hot_remove_disk | |
3446 | * then added disks for geometry changes, | |
3447 | * and should be added immediately. | |
3448 | */ | |
3449 | super_types[mddev->major_version]. | |
3450 | validate_super(mddev, rdev); | |
3451 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
3452 | if (err) | |
3453 | unbind_rdev_from_array(rdev); | |
3454 | } | |
1da177e4 LT |
3455 | if (err) |
3456 | export_rdev(rdev); | |
c361777f N |
3457 | |
3458 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 3459 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
3460 | return err; |
3461 | } | |
3462 | ||
3463 | /* otherwise, add_new_disk is only allowed | |
3464 | * for major_version==0 superblocks | |
3465 | */ | |
3466 | if (mddev->major_version != 0) { | |
3467 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
3468 | mdname(mddev)); | |
3469 | return -EINVAL; | |
3470 | } | |
3471 | ||
3472 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
3473 | int err; | |
3474 | rdev = md_import_device (dev, -1, 0); | |
3475 | if (IS_ERR(rdev)) { | |
3476 | printk(KERN_WARNING | |
3477 | "md: error, md_import_device() returned %ld\n", | |
3478 | PTR_ERR(rdev)); | |
3479 | return PTR_ERR(rdev); | |
3480 | } | |
3481 | rdev->desc_nr = info->number; | |
3482 | if (info->raid_disk < mddev->raid_disks) | |
3483 | rdev->raid_disk = info->raid_disk; | |
3484 | else | |
3485 | rdev->raid_disk = -1; | |
3486 | ||
b2d444d7 N |
3487 | rdev->flags = 0; |
3488 | ||
1da177e4 | 3489 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
3490 | if (info->state & (1<<MD_DISK_SYNC)) |
3491 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 3492 | |
8ddf9efe N |
3493 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
3494 | set_bit(WriteMostly, &rdev->flags); | |
3495 | ||
1da177e4 LT |
3496 | if (!mddev->persistent) { |
3497 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
3498 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
3499 | } else | |
3500 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
3501 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
3502 | ||
2bf071bf N |
3503 | err = bind_rdev_to_array(rdev, mddev); |
3504 | if (err) { | |
3505 | export_rdev(rdev); | |
3506 | return err; | |
3507 | } | |
1da177e4 LT |
3508 | } |
3509 | ||
3510 | return 0; | |
3511 | } | |
3512 | ||
3513 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
3514 | { | |
3515 | char b[BDEVNAME_SIZE]; | |
3516 | mdk_rdev_t *rdev; | |
3517 | ||
3518 | if (!mddev->pers) | |
3519 | return -ENODEV; | |
3520 | ||
3521 | rdev = find_rdev(mddev, dev); | |
3522 | if (!rdev) | |
3523 | return -ENXIO; | |
3524 | ||
3525 | if (rdev->raid_disk >= 0) | |
3526 | goto busy; | |
3527 | ||
3528 | kick_rdev_from_array(rdev); | |
3529 | md_update_sb(mddev); | |
d7603b7e | 3530 | md_new_event(mddev); |
1da177e4 LT |
3531 | |
3532 | return 0; | |
3533 | busy: | |
3534 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
3535 | bdevname(rdev->bdev,b), mdname(mddev)); | |
3536 | return -EBUSY; | |
3537 | } | |
3538 | ||
3539 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
3540 | { | |
3541 | char b[BDEVNAME_SIZE]; | |
3542 | int err; | |
3543 | unsigned int size; | |
3544 | mdk_rdev_t *rdev; | |
3545 | ||
3546 | if (!mddev->pers) | |
3547 | return -ENODEV; | |
3548 | ||
3549 | if (mddev->major_version != 0) { | |
3550 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
3551 | " version-0 superblocks.\n", | |
3552 | mdname(mddev)); | |
3553 | return -EINVAL; | |
3554 | } | |
3555 | if (!mddev->pers->hot_add_disk) { | |
3556 | printk(KERN_WARNING | |
3557 | "%s: personality does not support diskops!\n", | |
3558 | mdname(mddev)); | |
3559 | return -EINVAL; | |
3560 | } | |
3561 | ||
3562 | rdev = md_import_device (dev, -1, 0); | |
3563 | if (IS_ERR(rdev)) { | |
3564 | printk(KERN_WARNING | |
3565 | "md: error, md_import_device() returned %ld\n", | |
3566 | PTR_ERR(rdev)); | |
3567 | return -EINVAL; | |
3568 | } | |
3569 | ||
3570 | if (mddev->persistent) | |
3571 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
3572 | else | |
3573 | rdev->sb_offset = | |
3574 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
3575 | ||
3576 | size = calc_dev_size(rdev, mddev->chunk_size); | |
3577 | rdev->size = size; | |
3578 | ||
b2d444d7 | 3579 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3580 | printk(KERN_WARNING |
3581 | "md: can not hot-add faulty %s disk to %s!\n", | |
3582 | bdevname(rdev->bdev,b), mdname(mddev)); | |
3583 | err = -EINVAL; | |
3584 | goto abort_export; | |
3585 | } | |
b2d444d7 | 3586 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 3587 | rdev->desc_nr = -1; |
2bf071bf N |
3588 | err = bind_rdev_to_array(rdev, mddev); |
3589 | if (err) | |
3590 | goto abort_export; | |
1da177e4 LT |
3591 | |
3592 | /* | |
3593 | * The rest should better be atomic, we can have disk failures | |
3594 | * noticed in interrupt contexts ... | |
3595 | */ | |
3596 | ||
3597 | if (rdev->desc_nr == mddev->max_disks) { | |
3598 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
3599 | mdname(mddev)); | |
3600 | err = -EBUSY; | |
3601 | goto abort_unbind_export; | |
3602 | } | |
3603 | ||
3604 | rdev->raid_disk = -1; | |
3605 | ||
3606 | md_update_sb(mddev); | |
3607 | ||
3608 | /* | |
3609 | * Kick recovery, maybe this spare has to be added to the | |
3610 | * array immediately. | |
3611 | */ | |
3612 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3613 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 3614 | md_new_event(mddev); |
1da177e4 LT |
3615 | return 0; |
3616 | ||
3617 | abort_unbind_export: | |
3618 | unbind_rdev_from_array(rdev); | |
3619 | ||
3620 | abort_export: | |
3621 | export_rdev(rdev); | |
3622 | return err; | |
3623 | } | |
3624 | ||
32a7627c N |
3625 | static int set_bitmap_file(mddev_t *mddev, int fd) |
3626 | { | |
3627 | int err; | |
3628 | ||
36fa3063 N |
3629 | if (mddev->pers) { |
3630 | if (!mddev->pers->quiesce) | |
3631 | return -EBUSY; | |
3632 | if (mddev->recovery || mddev->sync_thread) | |
3633 | return -EBUSY; | |
3634 | /* we should be able to change the bitmap.. */ | |
3635 | } | |
32a7627c | 3636 | |
32a7627c | 3637 | |
36fa3063 N |
3638 | if (fd >= 0) { |
3639 | if (mddev->bitmap) | |
3640 | return -EEXIST; /* cannot add when bitmap is present */ | |
3641 | mddev->bitmap_file = fget(fd); | |
32a7627c | 3642 | |
36fa3063 N |
3643 | if (mddev->bitmap_file == NULL) { |
3644 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
3645 | mdname(mddev)); | |
3646 | return -EBADF; | |
3647 | } | |
3648 | ||
3649 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
3650 | if (err) { | |
3651 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
3652 | mdname(mddev)); | |
3653 | fput(mddev->bitmap_file); | |
3654 | mddev->bitmap_file = NULL; | |
3655 | return err; | |
3656 | } | |
a654b9d8 | 3657 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
3658 | } else if (mddev->bitmap == NULL) |
3659 | return -ENOENT; /* cannot remove what isn't there */ | |
3660 | err = 0; | |
3661 | if (mddev->pers) { | |
3662 | mddev->pers->quiesce(mddev, 1); | |
3663 | if (fd >= 0) | |
3664 | err = bitmap_create(mddev); | |
d7375ab3 | 3665 | if (fd < 0 || err) { |
36fa3063 | 3666 | bitmap_destroy(mddev); |
d7375ab3 N |
3667 | fd = -1; /* make sure to put the file */ |
3668 | } | |
36fa3063 | 3669 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
3670 | } |
3671 | if (fd < 0) { | |
acc55e22 N |
3672 | if (mddev->bitmap_file) { |
3673 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 3674 | fput(mddev->bitmap_file); |
acc55e22 | 3675 | } |
36fa3063 N |
3676 | mddev->bitmap_file = NULL; |
3677 | } | |
3678 | ||
32a7627c N |
3679 | return err; |
3680 | } | |
3681 | ||
1da177e4 LT |
3682 | /* |
3683 | * set_array_info is used two different ways | |
3684 | * The original usage is when creating a new array. | |
3685 | * In this usage, raid_disks is > 0 and it together with | |
3686 | * level, size, not_persistent,layout,chunksize determine the | |
3687 | * shape of the array. | |
3688 | * This will always create an array with a type-0.90.0 superblock. | |
3689 | * The newer usage is when assembling an array. | |
3690 | * In this case raid_disks will be 0, and the major_version field is | |
3691 | * use to determine which style super-blocks are to be found on the devices. | |
3692 | * The minor and patch _version numbers are also kept incase the | |
3693 | * super_block handler wishes to interpret them. | |
3694 | */ | |
3695 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
3696 | { | |
3697 | ||
3698 | if (info->raid_disks == 0) { | |
3699 | /* just setting version number for superblock loading */ | |
3700 | if (info->major_version < 0 || | |
3701 | info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || | |
3702 | super_types[info->major_version].name == NULL) { | |
3703 | /* maybe try to auto-load a module? */ | |
3704 | printk(KERN_INFO | |
3705 | "md: superblock version %d not known\n", | |
3706 | info->major_version); | |
3707 | return -EINVAL; | |
3708 | } | |
3709 | mddev->major_version = info->major_version; | |
3710 | mddev->minor_version = info->minor_version; | |
3711 | mddev->patch_version = info->patch_version; | |
3712 | return 0; | |
3713 | } | |
3714 | mddev->major_version = MD_MAJOR_VERSION; | |
3715 | mddev->minor_version = MD_MINOR_VERSION; | |
3716 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
3717 | mddev->ctime = get_seconds(); | |
3718 | ||
3719 | mddev->level = info->level; | |
17115e03 | 3720 | mddev->clevel[0] = 0; |
1da177e4 LT |
3721 | mddev->size = info->size; |
3722 | mddev->raid_disks = info->raid_disks; | |
3723 | /* don't set md_minor, it is determined by which /dev/md* was | |
3724 | * openned | |
3725 | */ | |
3726 | if (info->state & (1<<MD_SB_CLEAN)) | |
3727 | mddev->recovery_cp = MaxSector; | |
3728 | else | |
3729 | mddev->recovery_cp = 0; | |
3730 | mddev->persistent = ! info->not_persistent; | |
3731 | ||
3732 | mddev->layout = info->layout; | |
3733 | mddev->chunk_size = info->chunk_size; | |
3734 | ||
3735 | mddev->max_disks = MD_SB_DISKS; | |
3736 | ||
3737 | mddev->sb_dirty = 1; | |
3738 | ||
b2a2703c N |
3739 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
3740 | mddev->bitmap_offset = 0; | |
3741 | ||
f6705578 N |
3742 | mddev->reshape_position = MaxSector; |
3743 | ||
1da177e4 LT |
3744 | /* |
3745 | * Generate a 128 bit UUID | |
3746 | */ | |
3747 | get_random_bytes(mddev->uuid, 16); | |
3748 | ||
f6705578 N |
3749 | mddev->new_level = mddev->level; |
3750 | mddev->new_chunk = mddev->chunk_size; | |
3751 | mddev->new_layout = mddev->layout; | |
3752 | mddev->delta_disks = 0; | |
3753 | ||
1da177e4 LT |
3754 | return 0; |
3755 | } | |
3756 | ||
a35b0d69 N |
3757 | static int update_size(mddev_t *mddev, unsigned long size) |
3758 | { | |
3759 | mdk_rdev_t * rdev; | |
3760 | int rv; | |
3761 | struct list_head *tmp; | |
8ddeeae5 | 3762 | int fit = (size == 0); |
a35b0d69 N |
3763 | |
3764 | if (mddev->pers->resize == NULL) | |
3765 | return -EINVAL; | |
3766 | /* The "size" is the amount of each device that is used. | |
3767 | * This can only make sense for arrays with redundancy. | |
3768 | * linear and raid0 always use whatever space is available | |
3769 | * We can only consider changing the size if no resync | |
3770 | * or reconstruction is happening, and if the new size | |
3771 | * is acceptable. It must fit before the sb_offset or, | |
3772 | * if that is <data_offset, it must fit before the | |
3773 | * size of each device. | |
3774 | * If size is zero, we find the largest size that fits. | |
3775 | */ | |
3776 | if (mddev->sync_thread) | |
3777 | return -EBUSY; | |
3778 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3779 | sector_t avail; | |
a35b0d69 N |
3780 | if (rdev->sb_offset > rdev->data_offset) |
3781 | avail = (rdev->sb_offset*2) - rdev->data_offset; | |
3782 | else | |
3783 | avail = get_capacity(rdev->bdev->bd_disk) | |
3784 | - rdev->data_offset; | |
3785 | if (fit && (size == 0 || size > avail/2)) | |
3786 | size = avail/2; | |
3787 | if (avail < ((sector_t)size << 1)) | |
3788 | return -ENOSPC; | |
3789 | } | |
3790 | rv = mddev->pers->resize(mddev, (sector_t)size *2); | |
3791 | if (!rv) { | |
3792 | struct block_device *bdev; | |
3793 | ||
3794 | bdev = bdget_disk(mddev->gendisk, 0); | |
3795 | if (bdev) { | |
1b1dcc1b | 3796 | mutex_lock(&bdev->bd_inode->i_mutex); |
6d89332b | 3797 | i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10); |
1b1dcc1b | 3798 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
3799 | bdput(bdev); |
3800 | } | |
3801 | } | |
3802 | return rv; | |
3803 | } | |
3804 | ||
da943b99 N |
3805 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
3806 | { | |
3807 | int rv; | |
3808 | /* change the number of raid disks */ | |
63c70c4f | 3809 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
3810 | return -EINVAL; |
3811 | if (raid_disks <= 0 || | |
3812 | raid_disks >= mddev->max_disks) | |
3813 | return -EINVAL; | |
63c70c4f | 3814 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 3815 | return -EBUSY; |
63c70c4f N |
3816 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
3817 | ||
3818 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
3819 | return rv; |
3820 | } | |
3821 | ||
3822 | ||
1da177e4 LT |
3823 | /* |
3824 | * update_array_info is used to change the configuration of an | |
3825 | * on-line array. | |
3826 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
3827 | * fields in the info are checked against the array. | |
3828 | * Any differences that cannot be handled will cause an error. | |
3829 | * Normally, only one change can be managed at a time. | |
3830 | */ | |
3831 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
3832 | { | |
3833 | int rv = 0; | |
3834 | int cnt = 0; | |
36fa3063 N |
3835 | int state = 0; |
3836 | ||
3837 | /* calculate expected state,ignoring low bits */ | |
3838 | if (mddev->bitmap && mddev->bitmap_offset) | |
3839 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3840 | |
3841 | if (mddev->major_version != info->major_version || | |
3842 | mddev->minor_version != info->minor_version || | |
3843 | /* mddev->patch_version != info->patch_version || */ | |
3844 | mddev->ctime != info->ctime || | |
3845 | mddev->level != info->level || | |
3846 | /* mddev->layout != info->layout || */ | |
3847 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
3848 | mddev->chunk_size != info->chunk_size || |
3849 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
3850 | ((state^info->state) & 0xfffffe00) | |
3851 | ) | |
1da177e4 LT |
3852 | return -EINVAL; |
3853 | /* Check there is only one change */ | |
284ae7ca | 3854 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
3855 | if (mddev->raid_disks != info->raid_disks) cnt++; |
3856 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 3857 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
3858 | if (cnt == 0) return 0; |
3859 | if (cnt > 1) return -EINVAL; | |
3860 | ||
3861 | if (mddev->layout != info->layout) { | |
3862 | /* Change layout | |
3863 | * we don't need to do anything at the md level, the | |
3864 | * personality will take care of it all. | |
3865 | */ | |
3866 | if (mddev->pers->reconfig == NULL) | |
3867 | return -EINVAL; | |
3868 | else | |
3869 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
3870 | } | |
284ae7ca | 3871 | if (info->size >= 0 && mddev->size != info->size) |
a35b0d69 N |
3872 | rv = update_size(mddev, info->size); |
3873 | ||
da943b99 N |
3874 | if (mddev->raid_disks != info->raid_disks) |
3875 | rv = update_raid_disks(mddev, info->raid_disks); | |
3876 | ||
36fa3063 N |
3877 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
3878 | if (mddev->pers->quiesce == NULL) | |
3879 | return -EINVAL; | |
3880 | if (mddev->recovery || mddev->sync_thread) | |
3881 | return -EBUSY; | |
3882 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
3883 | /* add the bitmap */ | |
3884 | if (mddev->bitmap) | |
3885 | return -EEXIST; | |
3886 | if (mddev->default_bitmap_offset == 0) | |
3887 | return -EINVAL; | |
3888 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
3889 | mddev->pers->quiesce(mddev, 1); | |
3890 | rv = bitmap_create(mddev); | |
3891 | if (rv) | |
3892 | bitmap_destroy(mddev); | |
3893 | mddev->pers->quiesce(mddev, 0); | |
3894 | } else { | |
3895 | /* remove the bitmap */ | |
3896 | if (!mddev->bitmap) | |
3897 | return -ENOENT; | |
3898 | if (mddev->bitmap->file) | |
3899 | return -EINVAL; | |
3900 | mddev->pers->quiesce(mddev, 1); | |
3901 | bitmap_destroy(mddev); | |
3902 | mddev->pers->quiesce(mddev, 0); | |
3903 | mddev->bitmap_offset = 0; | |
3904 | } | |
3905 | } | |
1da177e4 LT |
3906 | md_update_sb(mddev); |
3907 | return rv; | |
3908 | } | |
3909 | ||
3910 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
3911 | { | |
3912 | mdk_rdev_t *rdev; | |
3913 | ||
3914 | if (mddev->pers == NULL) | |
3915 | return -ENODEV; | |
3916 | ||
3917 | rdev = find_rdev(mddev, dev); | |
3918 | if (!rdev) | |
3919 | return -ENODEV; | |
3920 | ||
3921 | md_error(mddev, rdev); | |
3922 | return 0; | |
3923 | } | |
3924 | ||
a885c8c4 CH |
3925 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
3926 | { | |
3927 | mddev_t *mddev = bdev->bd_disk->private_data; | |
3928 | ||
3929 | geo->heads = 2; | |
3930 | geo->sectors = 4; | |
3931 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
3932 | return 0; | |
3933 | } | |
3934 | ||
1da177e4 LT |
3935 | static int md_ioctl(struct inode *inode, struct file *file, |
3936 | unsigned int cmd, unsigned long arg) | |
3937 | { | |
3938 | int err = 0; | |
3939 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
3940 | mddev_t *mddev = NULL; |
3941 | ||
3942 | if (!capable(CAP_SYS_ADMIN)) | |
3943 | return -EACCES; | |
3944 | ||
3945 | /* | |
3946 | * Commands dealing with the RAID driver but not any | |
3947 | * particular array: | |
3948 | */ | |
3949 | switch (cmd) | |
3950 | { | |
3951 | case RAID_VERSION: | |
3952 | err = get_version(argp); | |
3953 | goto done; | |
3954 | ||
3955 | case PRINT_RAID_DEBUG: | |
3956 | err = 0; | |
3957 | md_print_devices(); | |
3958 | goto done; | |
3959 | ||
3960 | #ifndef MODULE | |
3961 | case RAID_AUTORUN: | |
3962 | err = 0; | |
3963 | autostart_arrays(arg); | |
3964 | goto done; | |
3965 | #endif | |
3966 | default:; | |
3967 | } | |
3968 | ||
3969 | /* | |
3970 | * Commands creating/starting a new array: | |
3971 | */ | |
3972 | ||
3973 | mddev = inode->i_bdev->bd_disk->private_data; | |
3974 | ||
3975 | if (!mddev) { | |
3976 | BUG(); | |
3977 | goto abort; | |
3978 | } | |
3979 | ||
3980 | ||
3981 | if (cmd == START_ARRAY) { | |
3982 | /* START_ARRAY doesn't need to lock the array as autostart_array | |
3983 | * does the locking, and it could even be a different array | |
3984 | */ | |
3985 | static int cnt = 3; | |
3986 | if (cnt > 0 ) { | |
3987 | printk(KERN_WARNING | |
3988 | "md: %s(pid %d) used deprecated START_ARRAY ioctl. " | |
e8a00334 | 3989 | "This will not be supported beyond July 2006\n", |
1da177e4 LT |
3990 | current->comm, current->pid); |
3991 | cnt--; | |
3992 | } | |
3993 | err = autostart_array(new_decode_dev(arg)); | |
3994 | if (err) { | |
3995 | printk(KERN_WARNING "md: autostart failed!\n"); | |
3996 | goto abort; | |
3997 | } | |
3998 | goto done; | |
3999 | } | |
4000 | ||
4001 | err = mddev_lock(mddev); | |
4002 | if (err) { | |
4003 | printk(KERN_INFO | |
4004 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4005 | err, cmd); | |
4006 | goto abort; | |
4007 | } | |
4008 | ||
4009 | switch (cmd) | |
4010 | { | |
4011 | case SET_ARRAY_INFO: | |
4012 | { | |
4013 | mdu_array_info_t info; | |
4014 | if (!arg) | |
4015 | memset(&info, 0, sizeof(info)); | |
4016 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4017 | err = -EFAULT; | |
4018 | goto abort_unlock; | |
4019 | } | |
4020 | if (mddev->pers) { | |
4021 | err = update_array_info(mddev, &info); | |
4022 | if (err) { | |
4023 | printk(KERN_WARNING "md: couldn't update" | |
4024 | " array info. %d\n", err); | |
4025 | goto abort_unlock; | |
4026 | } | |
4027 | goto done_unlock; | |
4028 | } | |
4029 | if (!list_empty(&mddev->disks)) { | |
4030 | printk(KERN_WARNING | |
4031 | "md: array %s already has disks!\n", | |
4032 | mdname(mddev)); | |
4033 | err = -EBUSY; | |
4034 | goto abort_unlock; | |
4035 | } | |
4036 | if (mddev->raid_disks) { | |
4037 | printk(KERN_WARNING | |
4038 | "md: array %s already initialised!\n", | |
4039 | mdname(mddev)); | |
4040 | err = -EBUSY; | |
4041 | goto abort_unlock; | |
4042 | } | |
4043 | err = set_array_info(mddev, &info); | |
4044 | if (err) { | |
4045 | printk(KERN_WARNING "md: couldn't set" | |
4046 | " array info. %d\n", err); | |
4047 | goto abort_unlock; | |
4048 | } | |
4049 | } | |
4050 | goto done_unlock; | |
4051 | ||
4052 | default:; | |
4053 | } | |
4054 | ||
4055 | /* | |
4056 | * Commands querying/configuring an existing array: | |
4057 | */ | |
32a7627c N |
4058 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
4059 | * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ | |
4060 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
4061 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { | |
1da177e4 LT |
4062 | err = -ENODEV; |
4063 | goto abort_unlock; | |
4064 | } | |
4065 | ||
4066 | /* | |
4067 | * Commands even a read-only array can execute: | |
4068 | */ | |
4069 | switch (cmd) | |
4070 | { | |
4071 | case GET_ARRAY_INFO: | |
4072 | err = get_array_info(mddev, argp); | |
4073 | goto done_unlock; | |
4074 | ||
32a7627c | 4075 | case GET_BITMAP_FILE: |
87162a28 | 4076 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
4077 | goto done_unlock; |
4078 | ||
1da177e4 LT |
4079 | case GET_DISK_INFO: |
4080 | err = get_disk_info(mddev, argp); | |
4081 | goto done_unlock; | |
4082 | ||
4083 | case RESTART_ARRAY_RW: | |
4084 | err = restart_array(mddev); | |
4085 | goto done_unlock; | |
4086 | ||
4087 | case STOP_ARRAY: | |
4088 | err = do_md_stop (mddev, 0); | |
4089 | goto done_unlock; | |
4090 | ||
4091 | case STOP_ARRAY_RO: | |
4092 | err = do_md_stop (mddev, 1); | |
4093 | goto done_unlock; | |
4094 | ||
4095 | /* | |
4096 | * We have a problem here : there is no easy way to give a CHS | |
4097 | * virtual geometry. We currently pretend that we have a 2 heads | |
4098 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4099 | * dosfs just mad... ;-) | |
4100 | */ | |
1da177e4 LT |
4101 | } |
4102 | ||
4103 | /* | |
4104 | * The remaining ioctls are changing the state of the | |
f91de92e N |
4105 | * superblock, so we do not allow them on read-only arrays. |
4106 | * However non-MD ioctls (e.g. get-size) will still come through | |
4107 | * here and hit the 'default' below, so only disallow | |
4108 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 4109 | */ |
f91de92e N |
4110 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
4111 | mddev->ro && mddev->pers) { | |
4112 | if (mddev->ro == 2) { | |
4113 | mddev->ro = 0; | |
4114 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4115 | md_wakeup_thread(mddev->thread); | |
4116 | ||
4117 | } else { | |
4118 | err = -EROFS; | |
4119 | goto abort_unlock; | |
4120 | } | |
1da177e4 LT |
4121 | } |
4122 | ||
4123 | switch (cmd) | |
4124 | { | |
4125 | case ADD_NEW_DISK: | |
4126 | { | |
4127 | mdu_disk_info_t info; | |
4128 | if (copy_from_user(&info, argp, sizeof(info))) | |
4129 | err = -EFAULT; | |
4130 | else | |
4131 | err = add_new_disk(mddev, &info); | |
4132 | goto done_unlock; | |
4133 | } | |
4134 | ||
4135 | case HOT_REMOVE_DISK: | |
4136 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
4137 | goto done_unlock; | |
4138 | ||
4139 | case HOT_ADD_DISK: | |
4140 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
4141 | goto done_unlock; | |
4142 | ||
4143 | case SET_DISK_FAULTY: | |
4144 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
4145 | goto done_unlock; | |
4146 | ||
4147 | case RUN_ARRAY: | |
4148 | err = do_md_run (mddev); | |
4149 | goto done_unlock; | |
4150 | ||
32a7627c N |
4151 | case SET_BITMAP_FILE: |
4152 | err = set_bitmap_file(mddev, (int)arg); | |
4153 | goto done_unlock; | |
4154 | ||
1da177e4 | 4155 | default: |
1da177e4 LT |
4156 | err = -EINVAL; |
4157 | goto abort_unlock; | |
4158 | } | |
4159 | ||
4160 | done_unlock: | |
4161 | abort_unlock: | |
4162 | mddev_unlock(mddev); | |
4163 | ||
4164 | return err; | |
4165 | done: | |
4166 | if (err) | |
4167 | MD_BUG(); | |
4168 | abort: | |
4169 | return err; | |
4170 | } | |
4171 | ||
4172 | static int md_open(struct inode *inode, struct file *file) | |
4173 | { | |
4174 | /* | |
4175 | * Succeed if we can lock the mddev, which confirms that | |
4176 | * it isn't being stopped right now. | |
4177 | */ | |
4178 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4179 | int err; | |
4180 | ||
4181 | if ((err = mddev_lock(mddev))) | |
4182 | goto out; | |
4183 | ||
4184 | err = 0; | |
4185 | mddev_get(mddev); | |
4186 | mddev_unlock(mddev); | |
4187 | ||
4188 | check_disk_change(inode->i_bdev); | |
4189 | out: | |
4190 | return err; | |
4191 | } | |
4192 | ||
4193 | static int md_release(struct inode *inode, struct file * file) | |
4194 | { | |
4195 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
4196 | ||
4197 | if (!mddev) | |
4198 | BUG(); | |
4199 | mddev_put(mddev); | |
4200 | ||
4201 | return 0; | |
4202 | } | |
4203 | ||
4204 | static int md_media_changed(struct gendisk *disk) | |
4205 | { | |
4206 | mddev_t *mddev = disk->private_data; | |
4207 | ||
4208 | return mddev->changed; | |
4209 | } | |
4210 | ||
4211 | static int md_revalidate(struct gendisk *disk) | |
4212 | { | |
4213 | mddev_t *mddev = disk->private_data; | |
4214 | ||
4215 | mddev->changed = 0; | |
4216 | return 0; | |
4217 | } | |
4218 | static struct block_device_operations md_fops = | |
4219 | { | |
4220 | .owner = THIS_MODULE, | |
4221 | .open = md_open, | |
4222 | .release = md_release, | |
4223 | .ioctl = md_ioctl, | |
a885c8c4 | 4224 | .getgeo = md_getgeo, |
1da177e4 LT |
4225 | .media_changed = md_media_changed, |
4226 | .revalidate_disk= md_revalidate, | |
4227 | }; | |
4228 | ||
75c96f85 | 4229 | static int md_thread(void * arg) |
1da177e4 LT |
4230 | { |
4231 | mdk_thread_t *thread = arg; | |
4232 | ||
1da177e4 LT |
4233 | /* |
4234 | * md_thread is a 'system-thread', it's priority should be very | |
4235 | * high. We avoid resource deadlocks individually in each | |
4236 | * raid personality. (RAID5 does preallocation) We also use RR and | |
4237 | * the very same RT priority as kswapd, thus we will never get | |
4238 | * into a priority inversion deadlock. | |
4239 | * | |
4240 | * we definitely have to have equal or higher priority than | |
4241 | * bdflush, otherwise bdflush will deadlock if there are too | |
4242 | * many dirty RAID5 blocks. | |
4243 | */ | |
1da177e4 | 4244 | |
6985c43f | 4245 | allow_signal(SIGKILL); |
a6fb0934 | 4246 | while (!kthread_should_stop()) { |
1da177e4 | 4247 | |
93588e22 N |
4248 | /* We need to wait INTERRUPTIBLE so that |
4249 | * we don't add to the load-average. | |
4250 | * That means we need to be sure no signals are | |
4251 | * pending | |
4252 | */ | |
4253 | if (signal_pending(current)) | |
4254 | flush_signals(current); | |
4255 | ||
4256 | wait_event_interruptible_timeout | |
4257 | (thread->wqueue, | |
4258 | test_bit(THREAD_WAKEUP, &thread->flags) | |
4259 | || kthread_should_stop(), | |
4260 | thread->timeout); | |
3e1d1d28 | 4261 | try_to_freeze(); |
1da177e4 LT |
4262 | |
4263 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
4264 | ||
787453c2 | 4265 | thread->run(thread->mddev); |
1da177e4 | 4266 | } |
a6fb0934 | 4267 | |
1da177e4 LT |
4268 | return 0; |
4269 | } | |
4270 | ||
4271 | void md_wakeup_thread(mdk_thread_t *thread) | |
4272 | { | |
4273 | if (thread) { | |
4274 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
4275 | set_bit(THREAD_WAKEUP, &thread->flags); | |
4276 | wake_up(&thread->wqueue); | |
4277 | } | |
4278 | } | |
4279 | ||
4280 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
4281 | const char *name) | |
4282 | { | |
4283 | mdk_thread_t *thread; | |
1da177e4 | 4284 | |
9ffae0cf | 4285 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
4286 | if (!thread) |
4287 | return NULL; | |
4288 | ||
1da177e4 LT |
4289 | init_waitqueue_head(&thread->wqueue); |
4290 | ||
1da177e4 LT |
4291 | thread->run = run; |
4292 | thread->mddev = mddev; | |
32a7627c | 4293 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 4294 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 4295 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
4296 | kfree(thread); |
4297 | return NULL; | |
4298 | } | |
1da177e4 LT |
4299 | return thread; |
4300 | } | |
4301 | ||
1da177e4 LT |
4302 | void md_unregister_thread(mdk_thread_t *thread) |
4303 | { | |
d28446fe | 4304 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
4305 | |
4306 | kthread_stop(thread->tsk); | |
1da177e4 LT |
4307 | kfree(thread); |
4308 | } | |
4309 | ||
4310 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
4311 | { | |
4312 | if (!mddev) { | |
4313 | MD_BUG(); | |
4314 | return; | |
4315 | } | |
4316 | ||
b2d444d7 | 4317 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4318 | return; |
32a7627c | 4319 | /* |
1da177e4 LT |
4320 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
4321 | mdname(mddev), | |
4322 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
4323 | __builtin_return_address(0),__builtin_return_address(1), | |
4324 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 4325 | */ |
1da177e4 LT |
4326 | if (!mddev->pers->error_handler) |
4327 | return; | |
4328 | mddev->pers->error_handler(mddev,rdev); | |
4329 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4330 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4331 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 4332 | md_new_event_inintr(mddev); |
1da177e4 LT |
4333 | } |
4334 | ||
4335 | /* seq_file implementation /proc/mdstat */ | |
4336 | ||
4337 | static void status_unused(struct seq_file *seq) | |
4338 | { | |
4339 | int i = 0; | |
4340 | mdk_rdev_t *rdev; | |
4341 | struct list_head *tmp; | |
4342 | ||
4343 | seq_printf(seq, "unused devices: "); | |
4344 | ||
4345 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
4346 | char b[BDEVNAME_SIZE]; | |
4347 | i++; | |
4348 | seq_printf(seq, "%s ", | |
4349 | bdevname(rdev->bdev,b)); | |
4350 | } | |
4351 | if (!i) | |
4352 | seq_printf(seq, "<none>"); | |
4353 | ||
4354 | seq_printf(seq, "\n"); | |
4355 | } | |
4356 | ||
4357 | ||
4358 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
4359 | { | |
4588b42e N |
4360 | sector_t max_blocks, resync, res; |
4361 | unsigned long dt, db, rt; | |
4362 | int scale; | |
4363 | unsigned int per_milli; | |
1da177e4 LT |
4364 | |
4365 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
4366 | ||
4367 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4368 | max_blocks = mddev->resync_max_sectors >> 1; | |
4369 | else | |
4370 | max_blocks = mddev->size; | |
4371 | ||
4372 | /* | |
4373 | * Should not happen. | |
4374 | */ | |
4375 | if (!max_blocks) { | |
4376 | MD_BUG(); | |
4377 | return; | |
4378 | } | |
4588b42e N |
4379 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
4380 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
4381 | * u32, as those are the requirements for sector_div. | |
4382 | * Thus 'scale' must be at least 10 | |
4383 | */ | |
4384 | scale = 10; | |
4385 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
4386 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
4387 | scale++; | |
4388 | } | |
4389 | res = (resync>>scale)*1000; | |
4390 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
4391 | ||
4392 | per_milli = res; | |
1da177e4 | 4393 | { |
4588b42e | 4394 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
4395 | seq_printf(seq, "["); |
4396 | for (i = 0; i < x; i++) | |
4397 | seq_printf(seq, "="); | |
4398 | seq_printf(seq, ">"); | |
4399 | for (i = 0; i < y; i++) | |
4400 | seq_printf(seq, "."); | |
4401 | seq_printf(seq, "] "); | |
4402 | } | |
4588b42e | 4403 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
4404 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
4405 | "reshape" : | |
1da177e4 | 4406 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? |
ccfcc3c1 | 4407 | "resync" : "recovery")), |
4588b42e N |
4408 | per_milli/10, per_milli % 10, |
4409 | (unsigned long long) resync, | |
4410 | (unsigned long long) max_blocks); | |
1da177e4 LT |
4411 | |
4412 | /* | |
4413 | * We do not want to overflow, so the order of operands and | |
4414 | * the * 100 / 100 trick are important. We do a +1 to be | |
4415 | * safe against division by zero. We only estimate anyway. | |
4416 | * | |
4417 | * dt: time from mark until now | |
4418 | * db: blocks written from mark until now | |
4419 | * rt: remaining time | |
4420 | */ | |
4421 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
4422 | if (!dt) dt++; | |
4423 | db = resync - (mddev->resync_mark_cnt/2); | |
4588b42e | 4424 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100; |
1da177e4 LT |
4425 | |
4426 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
4427 | ||
4428 | seq_printf(seq, " speed=%ldK/sec", db/dt); | |
4429 | } | |
4430 | ||
4431 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
4432 | { | |
4433 | struct list_head *tmp; | |
4434 | loff_t l = *pos; | |
4435 | mddev_t *mddev; | |
4436 | ||
4437 | if (l >= 0x10000) | |
4438 | return NULL; | |
4439 | if (!l--) | |
4440 | /* header */ | |
4441 | return (void*)1; | |
4442 | ||
4443 | spin_lock(&all_mddevs_lock); | |
4444 | list_for_each(tmp,&all_mddevs) | |
4445 | if (!l--) { | |
4446 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
4447 | mddev_get(mddev); | |
4448 | spin_unlock(&all_mddevs_lock); | |
4449 | return mddev; | |
4450 | } | |
4451 | spin_unlock(&all_mddevs_lock); | |
4452 | if (!l--) | |
4453 | return (void*)2;/* tail */ | |
4454 | return NULL; | |
4455 | } | |
4456 | ||
4457 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4458 | { | |
4459 | struct list_head *tmp; | |
4460 | mddev_t *next_mddev, *mddev = v; | |
4461 | ||
4462 | ++*pos; | |
4463 | if (v == (void*)2) | |
4464 | return NULL; | |
4465 | ||
4466 | spin_lock(&all_mddevs_lock); | |
4467 | if (v == (void*)1) | |
4468 | tmp = all_mddevs.next; | |
4469 | else | |
4470 | tmp = mddev->all_mddevs.next; | |
4471 | if (tmp != &all_mddevs) | |
4472 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
4473 | else { | |
4474 | next_mddev = (void*)2; | |
4475 | *pos = 0x10000; | |
4476 | } | |
4477 | spin_unlock(&all_mddevs_lock); | |
4478 | ||
4479 | if (v != (void*)1) | |
4480 | mddev_put(mddev); | |
4481 | return next_mddev; | |
4482 | ||
4483 | } | |
4484 | ||
4485 | static void md_seq_stop(struct seq_file *seq, void *v) | |
4486 | { | |
4487 | mddev_t *mddev = v; | |
4488 | ||
4489 | if (mddev && v != (void*)1 && v != (void*)2) | |
4490 | mddev_put(mddev); | |
4491 | } | |
4492 | ||
d7603b7e N |
4493 | struct mdstat_info { |
4494 | int event; | |
4495 | }; | |
4496 | ||
1da177e4 LT |
4497 | static int md_seq_show(struct seq_file *seq, void *v) |
4498 | { | |
4499 | mddev_t *mddev = v; | |
4500 | sector_t size; | |
4501 | struct list_head *tmp2; | |
4502 | mdk_rdev_t *rdev; | |
d7603b7e | 4503 | struct mdstat_info *mi = seq->private; |
32a7627c | 4504 | struct bitmap *bitmap; |
1da177e4 LT |
4505 | |
4506 | if (v == (void*)1) { | |
2604b703 | 4507 | struct mdk_personality *pers; |
1da177e4 LT |
4508 | seq_printf(seq, "Personalities : "); |
4509 | spin_lock(&pers_lock); | |
2604b703 N |
4510 | list_for_each_entry(pers, &pers_list, list) |
4511 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
4512 | |
4513 | spin_unlock(&pers_lock); | |
4514 | seq_printf(seq, "\n"); | |
d7603b7e | 4515 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
4516 | return 0; |
4517 | } | |
4518 | if (v == (void*)2) { | |
4519 | status_unused(seq); | |
4520 | return 0; | |
4521 | } | |
4522 | ||
5dc5cf7d | 4523 | if (mddev_lock(mddev) < 0) |
1da177e4 | 4524 | return -EINTR; |
5dc5cf7d | 4525 | |
1da177e4 LT |
4526 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
4527 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
4528 | mddev->pers ? "" : "in"); | |
4529 | if (mddev->pers) { | |
f91de92e | 4530 | if (mddev->ro==1) |
1da177e4 | 4531 | seq_printf(seq, " (read-only)"); |
f91de92e N |
4532 | if (mddev->ro==2) |
4533 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
4534 | seq_printf(seq, " %s", mddev->pers->name); |
4535 | } | |
4536 | ||
4537 | size = 0; | |
4538 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
4539 | char b[BDEVNAME_SIZE]; | |
4540 | seq_printf(seq, " %s[%d]", | |
4541 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
4542 | if (test_bit(WriteMostly, &rdev->flags)) |
4543 | seq_printf(seq, "(W)"); | |
b2d444d7 | 4544 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4545 | seq_printf(seq, "(F)"); |
4546 | continue; | |
b325a32e N |
4547 | } else if (rdev->raid_disk < 0) |
4548 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
4549 | size += rdev->size; |
4550 | } | |
4551 | ||
4552 | if (!list_empty(&mddev->disks)) { | |
4553 | if (mddev->pers) | |
4554 | seq_printf(seq, "\n %llu blocks", | |
4555 | (unsigned long long)mddev->array_size); | |
4556 | else | |
4557 | seq_printf(seq, "\n %llu blocks", | |
4558 | (unsigned long long)size); | |
4559 | } | |
1cd6bf19 N |
4560 | if (mddev->persistent) { |
4561 | if (mddev->major_version != 0 || | |
4562 | mddev->minor_version != 90) { | |
4563 | seq_printf(seq," super %d.%d", | |
4564 | mddev->major_version, | |
4565 | mddev->minor_version); | |
4566 | } | |
4567 | } else | |
4568 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
4569 | |
4570 | if (mddev->pers) { | |
4571 | mddev->pers->status (seq, mddev); | |
4572 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
4573 | if (mddev->pers->sync_request) { |
4574 | if (mddev->curr_resync > 2) { | |
4575 | status_resync (seq, mddev); | |
4576 | seq_printf(seq, "\n "); | |
4577 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
4578 | seq_printf(seq, "\tresync=DELAYED\n "); | |
4579 | else if (mddev->recovery_cp < MaxSector) | |
4580 | seq_printf(seq, "\tresync=PENDING\n "); | |
4581 | } | |
32a7627c N |
4582 | } else |
4583 | seq_printf(seq, "\n "); | |
4584 | ||
4585 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
4586 | unsigned long chunk_kb; |
4587 | unsigned long flags; | |
32a7627c N |
4588 | spin_lock_irqsave(&bitmap->lock, flags); |
4589 | chunk_kb = bitmap->chunksize >> 10; | |
4590 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
4591 | "%lu%s chunk", | |
4592 | bitmap->pages - bitmap->missing_pages, | |
4593 | bitmap->pages, | |
4594 | (bitmap->pages - bitmap->missing_pages) | |
4595 | << (PAGE_SHIFT - 10), | |
4596 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
4597 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
4598 | if (bitmap->file) { |
4599 | seq_printf(seq, ", file: "); | |
4600 | seq_path(seq, bitmap->file->f_vfsmnt, | |
4601 | bitmap->file->f_dentry," \t\n"); | |
32a7627c | 4602 | } |
78d742d8 | 4603 | |
32a7627c N |
4604 | seq_printf(seq, "\n"); |
4605 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
4606 | } |
4607 | ||
4608 | seq_printf(seq, "\n"); | |
4609 | } | |
4610 | mddev_unlock(mddev); | |
4611 | ||
4612 | return 0; | |
4613 | } | |
4614 | ||
4615 | static struct seq_operations md_seq_ops = { | |
4616 | .start = md_seq_start, | |
4617 | .next = md_seq_next, | |
4618 | .stop = md_seq_stop, | |
4619 | .show = md_seq_show, | |
4620 | }; | |
4621 | ||
4622 | static int md_seq_open(struct inode *inode, struct file *file) | |
4623 | { | |
4624 | int error; | |
d7603b7e N |
4625 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
4626 | if (mi == NULL) | |
4627 | return -ENOMEM; | |
1da177e4 LT |
4628 | |
4629 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
4630 | if (error) |
4631 | kfree(mi); | |
4632 | else { | |
4633 | struct seq_file *p = file->private_data; | |
4634 | p->private = mi; | |
4635 | mi->event = atomic_read(&md_event_count); | |
4636 | } | |
1da177e4 LT |
4637 | return error; |
4638 | } | |
4639 | ||
d7603b7e N |
4640 | static int md_seq_release(struct inode *inode, struct file *file) |
4641 | { | |
4642 | struct seq_file *m = file->private_data; | |
4643 | struct mdstat_info *mi = m->private; | |
4644 | m->private = NULL; | |
4645 | kfree(mi); | |
4646 | return seq_release(inode, file); | |
4647 | } | |
4648 | ||
4649 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) | |
4650 | { | |
4651 | struct seq_file *m = filp->private_data; | |
4652 | struct mdstat_info *mi = m->private; | |
4653 | int mask; | |
4654 | ||
4655 | poll_wait(filp, &md_event_waiters, wait); | |
4656 | ||
4657 | /* always allow read */ | |
4658 | mask = POLLIN | POLLRDNORM; | |
4659 | ||
4660 | if (mi->event != atomic_read(&md_event_count)) | |
4661 | mask |= POLLERR | POLLPRI; | |
4662 | return mask; | |
4663 | } | |
4664 | ||
1da177e4 LT |
4665 | static struct file_operations md_seq_fops = { |
4666 | .open = md_seq_open, | |
4667 | .read = seq_read, | |
4668 | .llseek = seq_lseek, | |
d7603b7e N |
4669 | .release = md_seq_release, |
4670 | .poll = mdstat_poll, | |
1da177e4 LT |
4671 | }; |
4672 | ||
2604b703 | 4673 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 4674 | { |
1da177e4 | 4675 | spin_lock(&pers_lock); |
2604b703 N |
4676 | list_add_tail(&p->list, &pers_list); |
4677 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
4678 | spin_unlock(&pers_lock); |
4679 | return 0; | |
4680 | } | |
4681 | ||
2604b703 | 4682 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 4683 | { |
2604b703 | 4684 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 4685 | spin_lock(&pers_lock); |
2604b703 | 4686 | list_del_init(&p->list); |
1da177e4 LT |
4687 | spin_unlock(&pers_lock); |
4688 | return 0; | |
4689 | } | |
4690 | ||
4691 | static int is_mddev_idle(mddev_t *mddev) | |
4692 | { | |
4693 | mdk_rdev_t * rdev; | |
4694 | struct list_head *tmp; | |
4695 | int idle; | |
4696 | unsigned long curr_events; | |
4697 | ||
4698 | idle = 1; | |
4699 | ITERATE_RDEV(mddev,rdev,tmp) { | |
4700 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
4701 | curr_events = disk_stat_read(disk, sectors[0]) + |
4702 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 4703 | atomic_read(&disk->sync_io); |
c0e48521 N |
4704 | /* The difference between curr_events and last_events |
4705 | * will be affected by any new non-sync IO (making | |
4706 | * curr_events bigger) and any difference in the amount of | |
4707 | * in-flight syncio (making current_events bigger or smaller) | |
4708 | * The amount in-flight is currently limited to | |
4709 | * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 | |
4710 | * which is at most 4096 sectors. | |
4711 | * These numbers are fairly fragile and should be made | |
4712 | * more robust, probably by enforcing the | |
4713 | * 'window size' that md_do_sync sort-of uses. | |
4714 | * | |
1da177e4 LT |
4715 | * Note: the following is an unsigned comparison. |
4716 | */ | |
c0e48521 | 4717 | if ((curr_events - rdev->last_events + 4096) > 8192) { |
1da177e4 LT |
4718 | rdev->last_events = curr_events; |
4719 | idle = 0; | |
4720 | } | |
4721 | } | |
4722 | return idle; | |
4723 | } | |
4724 | ||
4725 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
4726 | { | |
4727 | /* another "blocks" (512byte) blocks have been synced */ | |
4728 | atomic_sub(blocks, &mddev->recovery_active); | |
4729 | wake_up(&mddev->recovery_wait); | |
4730 | if (!ok) { | |
4731 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4732 | md_wakeup_thread(mddev->thread); | |
4733 | // stop recovery, signal do_sync .... | |
4734 | } | |
4735 | } | |
4736 | ||
4737 | ||
06d91a5f N |
4738 | /* md_write_start(mddev, bi) |
4739 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
4740 | * in superblock) before writing, schedule a superblock update |
4741 | * and wait for it to complete. | |
06d91a5f | 4742 | */ |
3d310eb7 | 4743 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 4744 | { |
06d91a5f | 4745 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 4746 | return; |
06d91a5f | 4747 | |
f91de92e N |
4748 | BUG_ON(mddev->ro == 1); |
4749 | if (mddev->ro == 2) { | |
4750 | /* need to switch to read/write */ | |
4751 | mddev->ro = 0; | |
4752 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4753 | md_wakeup_thread(mddev->thread); | |
4754 | } | |
06d91a5f | 4755 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 4756 | if (mddev->in_sync) { |
a9701a30 | 4757 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
4758 | if (mddev->in_sync) { |
4759 | mddev->in_sync = 0; | |
42543769 | 4760 | mddev->sb_dirty = 3; |
3d310eb7 N |
4761 | md_wakeup_thread(mddev->thread); |
4762 | } | |
a9701a30 | 4763 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 4764 | } |
3d310eb7 | 4765 | wait_event(mddev->sb_wait, mddev->sb_dirty==0); |
1da177e4 LT |
4766 | } |
4767 | ||
4768 | void md_write_end(mddev_t *mddev) | |
4769 | { | |
4770 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
4771 | if (mddev->safemode == 2) | |
4772 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 4773 | else if (mddev->safemode_delay) |
1da177e4 LT |
4774 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
4775 | } | |
4776 | } | |
4777 | ||
75c96f85 | 4778 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
4779 | |
4780 | #define SYNC_MARKS 10 | |
4781 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 4782 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
4783 | { |
4784 | mddev_t *mddev2; | |
4785 | unsigned int currspeed = 0, | |
4786 | window; | |
57afd89f | 4787 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
4788 | unsigned long mark[SYNC_MARKS]; |
4789 | sector_t mark_cnt[SYNC_MARKS]; | |
4790 | int last_mark,m; | |
4791 | struct list_head *tmp; | |
4792 | sector_t last_check; | |
57afd89f | 4793 | int skipped = 0; |
5fd6c1dc N |
4794 | struct list_head *rtmp; |
4795 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4796 | |
4797 | /* just incase thread restarts... */ | |
4798 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
4799 | return; | |
5fd6c1dc N |
4800 | if (mddev->ro) /* never try to sync a read-only array */ |
4801 | return; | |
1da177e4 LT |
4802 | |
4803 | /* we overload curr_resync somewhat here. | |
4804 | * 0 == not engaged in resync at all | |
4805 | * 2 == checking that there is no conflict with another sync | |
4806 | * 1 == like 2, but have yielded to allow conflicting resync to | |
4807 | * commense | |
4808 | * other == active in resync - this many blocks | |
4809 | * | |
4810 | * Before starting a resync we must have set curr_resync to | |
4811 | * 2, and then checked that every "conflicting" array has curr_resync | |
4812 | * less than ours. When we find one that is the same or higher | |
4813 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
4814 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
4815 | * This will mean we have to start checking from the beginning again. | |
4816 | * | |
4817 | */ | |
4818 | ||
4819 | do { | |
4820 | mddev->curr_resync = 2; | |
4821 | ||
4822 | try_again: | |
787453c2 | 4823 | if (kthread_should_stop()) { |
6985c43f | 4824 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
4825 | goto skip; |
4826 | } | |
4827 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
4828 | if (mddev2 == mddev) |
4829 | continue; | |
4830 | if (mddev2->curr_resync && | |
4831 | match_mddev_units(mddev,mddev2)) { | |
4832 | DEFINE_WAIT(wq); | |
4833 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
4834 | /* arbitrarily yield */ | |
4835 | mddev->curr_resync = 1; | |
4836 | wake_up(&resync_wait); | |
4837 | } | |
4838 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
4839 | /* no need to wait here, we can wait the next | |
4840 | * time 'round when curr_resync == 2 | |
4841 | */ | |
4842 | continue; | |
787453c2 N |
4843 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
4844 | if (!kthread_should_stop() && | |
8712e553 | 4845 | mddev2->curr_resync >= mddev->curr_resync) { |
1da177e4 LT |
4846 | printk(KERN_INFO "md: delaying resync of %s" |
4847 | " until %s has finished resync (they" | |
4848 | " share one or more physical units)\n", | |
4849 | mdname(mddev), mdname(mddev2)); | |
4850 | mddev_put(mddev2); | |
4851 | schedule(); | |
4852 | finish_wait(&resync_wait, &wq); | |
4853 | goto try_again; | |
4854 | } | |
4855 | finish_wait(&resync_wait, &wq); | |
4856 | } | |
4857 | } | |
4858 | } while (mddev->curr_resync < 2); | |
4859 | ||
5fd6c1dc | 4860 | j = 0; |
9d88883e | 4861 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 4862 | /* resync follows the size requested by the personality, |
57afd89f | 4863 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
4864 | */ |
4865 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 4866 | mddev->resync_mismatches = 0; |
5fd6c1dc N |
4867 | /* we don't use the checkpoint if there's a bitmap */ |
4868 | if (!mddev->bitmap && | |
4869 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
4870 | j = mddev->recovery_cp; | |
ccfcc3c1 N |
4871 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4872 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 4873 | else { |
1da177e4 LT |
4874 | /* recovery follows the physical size of devices */ |
4875 | max_sectors = mddev->size << 1; | |
5fd6c1dc N |
4876 | j = MaxSector; |
4877 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4878 | if (rdev->raid_disk >= 0 && | |
4879 | !test_bit(Faulty, &rdev->flags) && | |
4880 | !test_bit(In_sync, &rdev->flags) && | |
4881 | rdev->recovery_offset < j) | |
4882 | j = rdev->recovery_offset; | |
4883 | } | |
1da177e4 LT |
4884 | |
4885 | printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); | |
4886 | printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" | |
88202a0c | 4887 | " %d KB/sec/disc.\n", speed_min(mddev)); |
338cec32 | 4888 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
1da177e4 | 4889 | "(but not more than %d KB/sec) for reconstruction.\n", |
88202a0c | 4890 | speed_max(mddev)); |
1da177e4 LT |
4891 | |
4892 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 4893 | |
57afd89f | 4894 | io_sectors = 0; |
1da177e4 LT |
4895 | for (m = 0; m < SYNC_MARKS; m++) { |
4896 | mark[m] = jiffies; | |
57afd89f | 4897 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
4898 | } |
4899 | last_mark = 0; | |
4900 | mddev->resync_mark = mark[last_mark]; | |
4901 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
4902 | ||
4903 | /* | |
4904 | * Tune reconstruction: | |
4905 | */ | |
4906 | window = 32*(PAGE_SIZE/512); | |
4907 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
4908 | window/2,(unsigned long long) max_sectors/2); | |
4909 | ||
4910 | atomic_set(&mddev->recovery_active, 0); | |
4911 | init_waitqueue_head(&mddev->recovery_wait); | |
4912 | last_check = 0; | |
4913 | ||
4914 | if (j>2) { | |
4915 | printk(KERN_INFO | |
4916 | "md: resuming recovery of %s from checkpoint.\n", | |
4917 | mdname(mddev)); | |
4918 | mddev->curr_resync = j; | |
4919 | } | |
4920 | ||
4921 | while (j < max_sectors) { | |
57afd89f | 4922 | sector_t sectors; |
1da177e4 | 4923 | |
57afd89f N |
4924 | skipped = 0; |
4925 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
88202a0c | 4926 | currspeed < speed_min(mddev)); |
57afd89f | 4927 | if (sectors == 0) { |
1da177e4 LT |
4928 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
4929 | goto out; | |
4930 | } | |
57afd89f N |
4931 | |
4932 | if (!skipped) { /* actual IO requested */ | |
4933 | io_sectors += sectors; | |
4934 | atomic_add(sectors, &mddev->recovery_active); | |
4935 | } | |
4936 | ||
1da177e4 LT |
4937 | j += sectors; |
4938 | if (j>1) mddev->curr_resync = j; | |
d7603b7e N |
4939 | if (last_check == 0) |
4940 | /* this is the earliers that rebuilt will be | |
4941 | * visible in /proc/mdstat | |
4942 | */ | |
4943 | md_new_event(mddev); | |
57afd89f N |
4944 | |
4945 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
4946 | continue; |
4947 | ||
57afd89f | 4948 | last_check = io_sectors; |
1da177e4 LT |
4949 | |
4950 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
4951 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
4952 | break; | |
4953 | ||
4954 | repeat: | |
4955 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
4956 | /* step marks */ | |
4957 | int next = (last_mark+1) % SYNC_MARKS; | |
4958 | ||
4959 | mddev->resync_mark = mark[next]; | |
4960 | mddev->resync_mark_cnt = mark_cnt[next]; | |
4961 | mark[next] = jiffies; | |
57afd89f | 4962 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
4963 | last_mark = next; |
4964 | } | |
4965 | ||
4966 | ||
787453c2 | 4967 | if (kthread_should_stop()) { |
1da177e4 LT |
4968 | /* |
4969 | * got a signal, exit. | |
4970 | */ | |
4971 | printk(KERN_INFO | |
4972 | "md: md_do_sync() got signal ... exiting\n"); | |
1da177e4 LT |
4973 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4974 | goto out; | |
4975 | } | |
4976 | ||
4977 | /* | |
4978 | * this loop exits only if either when we are slower than | |
4979 | * the 'hard' speed limit, or the system was IO-idle for | |
4980 | * a jiffy. | |
4981 | * the system might be non-idle CPU-wise, but we only care | |
4982 | * about not overloading the IO subsystem. (things like an | |
4983 | * e2fsck being done on the RAID array should execute fast) | |
4984 | */ | |
4985 | mddev->queue->unplug_fn(mddev->queue); | |
4986 | cond_resched(); | |
4987 | ||
57afd89f N |
4988 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
4989 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 4990 | |
88202a0c N |
4991 | if (currspeed > speed_min(mddev)) { |
4992 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 4993 | !is_mddev_idle(mddev)) { |
c0e48521 | 4994 | msleep(500); |
1da177e4 LT |
4995 | goto repeat; |
4996 | } | |
4997 | } | |
4998 | } | |
4999 | printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); | |
5000 | /* | |
5001 | * this also signals 'finished resyncing' to md_stop | |
5002 | */ | |
5003 | out: | |
5004 | mddev->queue->unplug_fn(mddev->queue); | |
5005 | ||
5006 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
5007 | ||
5008 | /* tell personality that we are finished */ | |
57afd89f | 5009 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
5010 | |
5011 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
ccfcc3c1 N |
5012 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
5013 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && | |
5fd6c1dc N |
5014 | mddev->curr_resync > 2) { |
5015 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
5016 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5017 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
5018 | printk(KERN_INFO | |
5019 | "md: checkpointing recovery of %s.\n", | |
5020 | mdname(mddev)); | |
5021 | mddev->recovery_cp = mddev->curr_resync; | |
5022 | } | |
5023 | } else | |
5024 | mddev->recovery_cp = MaxSector; | |
5025 | } else { | |
5026 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
5027 | mddev->curr_resync = MaxSector; | |
5028 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5029 | if (rdev->raid_disk >= 0 && | |
5030 | !test_bit(Faulty, &rdev->flags) && | |
5031 | !test_bit(In_sync, &rdev->flags) && | |
5032 | rdev->recovery_offset < mddev->curr_resync) | |
5033 | rdev->recovery_offset = mddev->curr_resync; | |
5034 | mddev->sb_dirty = 1; | |
5035 | } | |
1da177e4 LT |
5036 | } |
5037 | ||
1da177e4 LT |
5038 | skip: |
5039 | mddev->curr_resync = 0; | |
5040 | wake_up(&resync_wait); | |
5041 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
5042 | md_wakeup_thread(mddev->thread); | |
5043 | } | |
29269553 | 5044 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
5045 | |
5046 | ||
5047 | /* | |
5048 | * This routine is regularly called by all per-raid-array threads to | |
5049 | * deal with generic issues like resync and super-block update. | |
5050 | * Raid personalities that don't have a thread (linear/raid0) do not | |
5051 | * need this as they never do any recovery or update the superblock. | |
5052 | * | |
5053 | * It does not do any resync itself, but rather "forks" off other threads | |
5054 | * to do that as needed. | |
5055 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
5056 | * "->recovery" and create a thread at ->sync_thread. | |
5057 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
5058 | * and wakeups up this thread which will reap the thread and finish up. | |
5059 | * This thread also removes any faulty devices (with nr_pending == 0). | |
5060 | * | |
5061 | * The overall approach is: | |
5062 | * 1/ if the superblock needs updating, update it. | |
5063 | * 2/ If a recovery thread is running, don't do anything else. | |
5064 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
5065 | * 4/ If there are any faulty devices, remove them. | |
5066 | * 5/ If array is degraded, try to add spares devices | |
5067 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
5068 | */ | |
5069 | void md_check_recovery(mddev_t *mddev) | |
5070 | { | |
5071 | mdk_rdev_t *rdev; | |
5072 | struct list_head *rtmp; | |
5073 | ||
5074 | ||
5f40402d N |
5075 | if (mddev->bitmap) |
5076 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
5077 | |
5078 | if (mddev->ro) | |
5079 | return; | |
fca4d848 N |
5080 | |
5081 | if (signal_pending(current)) { | |
5082 | if (mddev->pers->sync_request) { | |
5083 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
5084 | mdname(mddev)); | |
5085 | mddev->safemode = 2; | |
5086 | } | |
5087 | flush_signals(current); | |
5088 | } | |
5089 | ||
1da177e4 LT |
5090 | if ( ! ( |
5091 | mddev->sb_dirty || | |
5092 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || | |
fca4d848 N |
5093 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
5094 | (mddev->safemode == 1) || | |
5095 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
5096 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
5097 | )) |
5098 | return; | |
fca4d848 | 5099 | |
df5b89b3 | 5100 | if (mddev_trylock(mddev)) { |
1da177e4 | 5101 | int spares =0; |
fca4d848 | 5102 | |
a9701a30 | 5103 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
5104 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
5105 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
5106 | mddev->in_sync = 1; | |
42543769 | 5107 | mddev->sb_dirty = 3; |
fca4d848 N |
5108 | } |
5109 | if (mddev->safemode == 1) | |
5110 | mddev->safemode = 0; | |
a9701a30 | 5111 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 5112 | |
1da177e4 LT |
5113 | if (mddev->sb_dirty) |
5114 | md_update_sb(mddev); | |
06d91a5f | 5115 | |
06d91a5f | 5116 | |
1da177e4 LT |
5117 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
5118 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
5119 | /* resync/recovery still happening */ | |
5120 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5121 | goto unlock; | |
5122 | } | |
5123 | if (mddev->sync_thread) { | |
5124 | /* resync has finished, collect result */ | |
5125 | md_unregister_thread(mddev->sync_thread); | |
5126 | mddev->sync_thread = NULL; | |
5127 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
5128 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5129 | /* success...*/ | |
5130 | /* activate any spares */ | |
5131 | mddev->pers->spare_active(mddev); | |
5132 | } | |
5133 | md_update_sb(mddev); | |
41158c7e N |
5134 | |
5135 | /* if array is no-longer degraded, then any saved_raid_disk | |
5136 | * information must be scrapped | |
5137 | */ | |
5138 | if (!mddev->degraded) | |
5139 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5140 | rdev->saved_raid_disk = -1; | |
5141 | ||
1da177e4 LT |
5142 | mddev->recovery = 0; |
5143 | /* flag recovery needed just to double check */ | |
5144 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 5145 | md_new_event(mddev); |
1da177e4 LT |
5146 | goto unlock; |
5147 | } | |
24dd469d N |
5148 | /* Clear some bits that don't mean anything, but |
5149 | * might be left set | |
5150 | */ | |
5151 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5152 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
5153 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5154 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 5155 | |
5fd6c1dc N |
5156 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
5157 | goto unlock; | |
1da177e4 LT |
5158 | /* no recovery is running. |
5159 | * remove any failed drives, then | |
5160 | * add spares if possible. | |
5161 | * Spare are also removed and re-added, to allow | |
5162 | * the personality to fail the re-add. | |
5163 | */ | |
5164 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5165 | if (rdev->raid_disk >= 0 && | |
b2d444d7 | 5166 | (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && |
1da177e4 | 5167 | atomic_read(&rdev->nr_pending)==0) { |
86e6ffdd N |
5168 | if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { |
5169 | char nm[20]; | |
5170 | sprintf(nm,"rd%d", rdev->raid_disk); | |
5171 | sysfs_remove_link(&mddev->kobj, nm); | |
1da177e4 | 5172 | rdev->raid_disk = -1; |
86e6ffdd | 5173 | } |
1da177e4 LT |
5174 | } |
5175 | ||
5176 | if (mddev->degraded) { | |
5177 | ITERATE_RDEV(mddev,rdev,rtmp) | |
5178 | if (rdev->raid_disk < 0 | |
b2d444d7 | 5179 | && !test_bit(Faulty, &rdev->flags)) { |
5fd6c1dc | 5180 | rdev->recovery_offset = 0; |
86e6ffdd N |
5181 | if (mddev->pers->hot_add_disk(mddev,rdev)) { |
5182 | char nm[20]; | |
5183 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5184 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
1da177e4 | 5185 | spares++; |
d7603b7e | 5186 | md_new_event(mddev); |
86e6ffdd | 5187 | } else |
1da177e4 LT |
5188 | break; |
5189 | } | |
5190 | } | |
5191 | ||
24dd469d N |
5192 | if (spares) { |
5193 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
5194 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
5195 | } else if (mddev->recovery_cp < MaxSector) { | |
5196 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
5197 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5198 | /* nothing to be done ... */ | |
1da177e4 | 5199 | goto unlock; |
24dd469d | 5200 | |
1da177e4 LT |
5201 | if (mddev->pers->sync_request) { |
5202 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
5203 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
5204 | /* We are adding a device or devices to an array | |
5205 | * which has the bitmap stored on all devices. | |
5206 | * So make sure all bitmap pages get written | |
5207 | */ | |
5208 | bitmap_write_all(mddev->bitmap); | |
5209 | } | |
1da177e4 LT |
5210 | mddev->sync_thread = md_register_thread(md_do_sync, |
5211 | mddev, | |
5212 | "%s_resync"); | |
5213 | if (!mddev->sync_thread) { | |
5214 | printk(KERN_ERR "%s: could not start resync" | |
5215 | " thread...\n", | |
5216 | mdname(mddev)); | |
5217 | /* leave the spares where they are, it shouldn't hurt */ | |
5218 | mddev->recovery = 0; | |
d7603b7e | 5219 | } else |
1da177e4 | 5220 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 5221 | md_new_event(mddev); |
1da177e4 LT |
5222 | } |
5223 | unlock: | |
5224 | mddev_unlock(mddev); | |
5225 | } | |
5226 | } | |
5227 | ||
75c96f85 AB |
5228 | static int md_notify_reboot(struct notifier_block *this, |
5229 | unsigned long code, void *x) | |
1da177e4 LT |
5230 | { |
5231 | struct list_head *tmp; | |
5232 | mddev_t *mddev; | |
5233 | ||
5234 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
5235 | ||
5236 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
5237 | ||
5238 | ITERATE_MDDEV(mddev,tmp) | |
c71d4887 | 5239 | if (mddev_trylock(mddev)) { |
1da177e4 | 5240 | do_md_stop (mddev, 1); |
c71d4887 NB |
5241 | mddev_unlock(mddev); |
5242 | } | |
1da177e4 LT |
5243 | /* |
5244 | * certain more exotic SCSI devices are known to be | |
5245 | * volatile wrt too early system reboots. While the | |
5246 | * right place to handle this issue is the given | |
5247 | * driver, we do want to have a safe RAID driver ... | |
5248 | */ | |
5249 | mdelay(1000*1); | |
5250 | } | |
5251 | return NOTIFY_DONE; | |
5252 | } | |
5253 | ||
75c96f85 | 5254 | static struct notifier_block md_notifier = { |
1da177e4 LT |
5255 | .notifier_call = md_notify_reboot, |
5256 | .next = NULL, | |
5257 | .priority = INT_MAX, /* before any real devices */ | |
5258 | }; | |
5259 | ||
5260 | static void md_geninit(void) | |
5261 | { | |
5262 | struct proc_dir_entry *p; | |
5263 | ||
5264 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
5265 | ||
5266 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
5267 | if (p) | |
5268 | p->proc_fops = &md_seq_fops; | |
5269 | } | |
5270 | ||
75c96f85 | 5271 | static int __init md_init(void) |
1da177e4 LT |
5272 | { |
5273 | int minor; | |
5274 | ||
5275 | printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," | |
5276 | " MD_SB_DISKS=%d\n", | |
5277 | MD_MAJOR_VERSION, MD_MINOR_VERSION, | |
5278 | MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); | |
bd926c63 | 5279 | printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, |
32a7627c | 5280 | BITMAP_MINOR); |
1da177e4 LT |
5281 | |
5282 | if (register_blkdev(MAJOR_NR, "md")) | |
5283 | return -1; | |
5284 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
5285 | unregister_blkdev(MAJOR_NR, "md"); | |
5286 | return -1; | |
5287 | } | |
5288 | devfs_mk_dir("md"); | |
5289 | blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, | |
5290 | md_probe, NULL, NULL); | |
5291 | blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, | |
5292 | md_probe, NULL, NULL); | |
5293 | ||
5294 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
5295 | devfs_mk_bdev(MKDEV(MAJOR_NR, minor), | |
5296 | S_IFBLK|S_IRUSR|S_IWUSR, | |
5297 | "md/%d", minor); | |
5298 | ||
5299 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
5300 | devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), | |
5301 | S_IFBLK|S_IRUSR|S_IWUSR, | |
5302 | "md/mdp%d", minor); | |
5303 | ||
5304 | ||
5305 | register_reboot_notifier(&md_notifier); | |
5306 | raid_table_header = register_sysctl_table(raid_root_table, 1); | |
5307 | ||
5308 | md_geninit(); | |
5309 | return (0); | |
5310 | } | |
5311 | ||
5312 | ||
5313 | #ifndef MODULE | |
5314 | ||
5315 | /* | |
5316 | * Searches all registered partitions for autorun RAID arrays | |
5317 | * at boot time. | |
5318 | */ | |
5319 | static dev_t detected_devices[128]; | |
5320 | static int dev_cnt; | |
5321 | ||
5322 | void md_autodetect_dev(dev_t dev) | |
5323 | { | |
5324 | if (dev_cnt >= 0 && dev_cnt < 127) | |
5325 | detected_devices[dev_cnt++] = dev; | |
5326 | } | |
5327 | ||
5328 | ||
5329 | static void autostart_arrays(int part) | |
5330 | { | |
5331 | mdk_rdev_t *rdev; | |
5332 | int i; | |
5333 | ||
5334 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
5335 | ||
5336 | for (i = 0; i < dev_cnt; i++) { | |
5337 | dev_t dev = detected_devices[i]; | |
5338 | ||
5339 | rdev = md_import_device(dev,0, 0); | |
5340 | if (IS_ERR(rdev)) | |
5341 | continue; | |
5342 | ||
b2d444d7 | 5343 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5344 | MD_BUG(); |
5345 | continue; | |
5346 | } | |
5347 | list_add(&rdev->same_set, &pending_raid_disks); | |
5348 | } | |
5349 | dev_cnt = 0; | |
5350 | ||
5351 | autorun_devices(part); | |
5352 | } | |
5353 | ||
5354 | #endif | |
5355 | ||
5356 | static __exit void md_exit(void) | |
5357 | { | |
5358 | mddev_t *mddev; | |
5359 | struct list_head *tmp; | |
5360 | int i; | |
5361 | blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); | |
5362 | blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); | |
5363 | for (i=0; i < MAX_MD_DEVS; i++) | |
5364 | devfs_remove("md/%d", i); | |
5365 | for (i=0; i < MAX_MD_DEVS; i++) | |
5366 | devfs_remove("md/d%d", i); | |
5367 | ||
5368 | devfs_remove("md"); | |
5369 | ||
5370 | unregister_blkdev(MAJOR_NR,"md"); | |
5371 | unregister_blkdev(mdp_major, "mdp"); | |
5372 | unregister_reboot_notifier(&md_notifier); | |
5373 | unregister_sysctl_table(raid_table_header); | |
5374 | remove_proc_entry("mdstat", NULL); | |
5375 | ITERATE_MDDEV(mddev,tmp) { | |
5376 | struct gendisk *disk = mddev->gendisk; | |
5377 | if (!disk) | |
5378 | continue; | |
5379 | export_array(mddev); | |
5380 | del_gendisk(disk); | |
5381 | put_disk(disk); | |
5382 | mddev->gendisk = NULL; | |
5383 | mddev_put(mddev); | |
5384 | } | |
5385 | } | |
5386 | ||
5387 | module_init(md_init) | |
5388 | module_exit(md_exit) | |
5389 | ||
f91de92e N |
5390 | static int get_ro(char *buffer, struct kernel_param *kp) |
5391 | { | |
5392 | return sprintf(buffer, "%d", start_readonly); | |
5393 | } | |
5394 | static int set_ro(const char *val, struct kernel_param *kp) | |
5395 | { | |
5396 | char *e; | |
5397 | int num = simple_strtoul(val, &e, 10); | |
5398 | if (*val && (*e == '\0' || *e == '\n')) { | |
5399 | start_readonly = num; | |
4dbcdc75 | 5400 | return 0; |
f91de92e N |
5401 | } |
5402 | return -EINVAL; | |
5403 | } | |
5404 | ||
5405 | module_param_call(start_ro, set_ro, get_ro, NULL, 0600); | |
6ff8d8ec N |
5406 | module_param(start_dirty_degraded, int, 0644); |
5407 | ||
f91de92e | 5408 | |
1da177e4 LT |
5409 | EXPORT_SYMBOL(register_md_personality); |
5410 | EXPORT_SYMBOL(unregister_md_personality); | |
5411 | EXPORT_SYMBOL(md_error); | |
5412 | EXPORT_SYMBOL(md_done_sync); | |
5413 | EXPORT_SYMBOL(md_write_start); | |
5414 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
5415 | EXPORT_SYMBOL(md_register_thread); |
5416 | EXPORT_SYMBOL(md_unregister_thread); | |
5417 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
5418 | EXPORT_SYMBOL(md_check_recovery); |
5419 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 5420 | MODULE_ALIAS("md"); |
72008652 | 5421 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |