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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 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
1da177e4 | 36 | #include <linux/raid/md.h> |
32a7627c | 37 | #include <linux/raid/bitmap.h> |
1da177e4 | 38 | #include <linux/sysctl.h> |
1da177e4 | 39 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
fb4d8c76 N |
42 | #include <linux/hdreg.h> |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/random.h> | |
45 | #include <linux/reboot.h> | |
32a7627c | 46 | #include <linux/file.h> |
25570727 | 47 | #include <linux/delay.h> |
32a7627c | 48 | |
1da177e4 | 49 | #define MAJOR_NR MD_MAJOR |
1da177e4 LT |
50 | |
51 | /* 63 partitions with the alternate major number (mdp) */ | |
52 | #define MdpMinorShift 6 | |
53 | ||
54 | #define DEBUG 0 | |
55 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
56 | ||
57 | ||
58 | #ifndef MODULE | |
d710e138 | 59 | static void autostart_arrays(int part); |
1da177e4 LT |
60 | #endif |
61 | ||
2604b703 | 62 | static LIST_HEAD(pers_list); |
1da177e4 LT |
63 | static DEFINE_SPINLOCK(pers_lock); |
64 | ||
5e56341d AB |
65 | static void md_print_devices(void); |
66 | ||
90b08710 BS |
67 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
68 | ||
5e56341d AB |
69 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
70 | ||
1da177e4 LT |
71 | /* |
72 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
73 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
74 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 75 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
76 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
77 | * speed limit - in case reconstruction slows down your system despite | |
78 | * idle IO detection. | |
79 | * | |
80 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 81 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
82 | */ |
83 | ||
84 | static int sysctl_speed_limit_min = 1000; | |
85 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
86 | static inline int speed_min(mddev_t *mddev) |
87 | { | |
88 | return mddev->sync_speed_min ? | |
89 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
90 | } | |
91 | ||
92 | static inline int speed_max(mddev_t *mddev) | |
93 | { | |
94 | return mddev->sync_speed_max ? | |
95 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
96 | } | |
1da177e4 LT |
97 | |
98 | static struct ctl_table_header *raid_table_header; | |
99 | ||
100 | static ctl_table raid_table[] = { | |
101 | { | |
102 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
103 | .procname = "speed_limit_min", | |
104 | .data = &sysctl_speed_limit_min, | |
105 | .maxlen = sizeof(int), | |
80ca3a44 | 106 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
107 | .proc_handler = &proc_dointvec, |
108 | }, | |
109 | { | |
110 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
111 | .procname = "speed_limit_max", | |
112 | .data = &sysctl_speed_limit_max, | |
113 | .maxlen = sizeof(int), | |
80ca3a44 | 114 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
115 | .proc_handler = &proc_dointvec, |
116 | }, | |
117 | { .ctl_name = 0 } | |
118 | }; | |
119 | ||
120 | static ctl_table raid_dir_table[] = { | |
121 | { | |
122 | .ctl_name = DEV_RAID, | |
123 | .procname = "raid", | |
124 | .maxlen = 0, | |
80ca3a44 | 125 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
126 | .child = raid_table, |
127 | }, | |
128 | { .ctl_name = 0 } | |
129 | }; | |
130 | ||
131 | static ctl_table raid_root_table[] = { | |
132 | { | |
133 | .ctl_name = CTL_DEV, | |
134 | .procname = "dev", | |
135 | .maxlen = 0, | |
136 | .mode = 0555, | |
137 | .child = raid_dir_table, | |
138 | }, | |
139 | { .ctl_name = 0 } | |
140 | }; | |
141 | ||
142 | static struct block_device_operations md_fops; | |
143 | ||
f91de92e N |
144 | static int start_readonly; |
145 | ||
d7603b7e N |
146 | /* |
147 | * We have a system wide 'event count' that is incremented | |
148 | * on any 'interesting' event, and readers of /proc/mdstat | |
149 | * can use 'poll' or 'select' to find out when the event | |
150 | * count increases. | |
151 | * | |
152 | * Events are: | |
153 | * start array, stop array, error, add device, remove device, | |
154 | * start build, activate spare | |
155 | */ | |
2989ddbd | 156 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 157 | static atomic_t md_event_count; |
29269553 | 158 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
159 | { |
160 | atomic_inc(&md_event_count); | |
161 | wake_up(&md_event_waiters); | |
162 | } | |
29269553 | 163 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 164 | |
c331eb04 N |
165 | /* Alternate version that can be called from interrupts |
166 | * when calling sysfs_notify isn't needed. | |
167 | */ | |
05381954 | 168 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
169 | { |
170 | atomic_inc(&md_event_count); | |
171 | wake_up(&md_event_waiters); | |
172 | } | |
173 | ||
1da177e4 LT |
174 | /* |
175 | * Enables to iterate over all existing md arrays | |
176 | * all_mddevs_lock protects this list. | |
177 | */ | |
178 | static LIST_HEAD(all_mddevs); | |
179 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
180 | ||
181 | ||
182 | /* | |
183 | * iterates through all used mddevs in the system. | |
184 | * We take care to grab the all_mddevs_lock whenever navigating | |
185 | * the list, and to always hold a refcount when unlocked. | |
186 | * Any code which breaks out of this loop while own | |
187 | * a reference to the current mddev and must mddev_put it. | |
188 | */ | |
29ac4aa3 | 189 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
190 | \ |
191 | for (({ spin_lock(&all_mddevs_lock); \ | |
192 | tmp = all_mddevs.next; \ | |
193 | mddev = NULL;}); \ | |
194 | ({ if (tmp != &all_mddevs) \ | |
195 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
196 | spin_unlock(&all_mddevs_lock); \ | |
197 | if (mddev) mddev_put(mddev); \ | |
198 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
199 | tmp != &all_mddevs;}); \ | |
200 | ({ spin_lock(&all_mddevs_lock); \ | |
201 | tmp = tmp->next;}) \ | |
202 | ) | |
203 | ||
204 | ||
d710e138 | 205 | static int md_fail_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 206 | { |
6712ecf8 | 207 | bio_io_error(bio); |
1da177e4 LT |
208 | return 0; |
209 | } | |
210 | ||
211 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
212 | { | |
213 | atomic_inc(&mddev->active); | |
214 | return mddev; | |
215 | } | |
216 | ||
217 | static void mddev_put(mddev_t *mddev) | |
218 | { | |
219 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
220 | return; | |
221 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
222 | list_del(&mddev->all_mddevs); | |
926ce2d8 | 223 | spin_unlock(&all_mddevs_lock); |
c10997f6 | 224 | kobject_put(&mddev->kobj); |
926ce2d8 N |
225 | } else |
226 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
227 | } |
228 | ||
229 | static mddev_t * mddev_find(dev_t unit) | |
230 | { | |
231 | mddev_t *mddev, *new = NULL; | |
232 | ||
233 | retry: | |
234 | spin_lock(&all_mddevs_lock); | |
235 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
236 | if (mddev->unit == unit) { | |
237 | mddev_get(mddev); | |
238 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 239 | kfree(new); |
1da177e4 LT |
240 | return mddev; |
241 | } | |
242 | ||
243 | if (new) { | |
244 | list_add(&new->all_mddevs, &all_mddevs); | |
245 | spin_unlock(&all_mddevs_lock); | |
246 | return new; | |
247 | } | |
248 | spin_unlock(&all_mddevs_lock); | |
249 | ||
9ffae0cf | 250 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
251 | if (!new) |
252 | return NULL; | |
253 | ||
1da177e4 LT |
254 | new->unit = unit; |
255 | if (MAJOR(unit) == MD_MAJOR) | |
256 | new->md_minor = MINOR(unit); | |
257 | else | |
258 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
259 | ||
df5b89b3 | 260 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
261 | INIT_LIST_HEAD(&new->disks); |
262 | INIT_LIST_HEAD(&new->all_mddevs); | |
263 | init_timer(&new->safemode_timer); | |
264 | atomic_set(&new->active, 1); | |
f2ea68cf | 265 | atomic_set(&new->openers, 0); |
06d91a5f | 266 | spin_lock_init(&new->write_lock); |
3d310eb7 | 267 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 268 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 269 | new->reshape_position = MaxSector; |
5e96ee65 | 270 | new->resync_min = 0; |
c6207277 | 271 | new->resync_max = MaxSector; |
d897dbf9 | 272 | new->level = LEVEL_NONE; |
1da177e4 | 273 | |
1da177e4 LT |
274 | goto retry; |
275 | } | |
276 | ||
277 | static inline int mddev_lock(mddev_t * mddev) | |
278 | { | |
df5b89b3 | 279 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
280 | } |
281 | ||
1da177e4 LT |
282 | static inline int mddev_trylock(mddev_t * mddev) |
283 | { | |
df5b89b3 | 284 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
285 | } |
286 | ||
287 | static inline void mddev_unlock(mddev_t * mddev) | |
288 | { | |
df5b89b3 | 289 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 290 | |
005eca5e | 291 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
292 | } |
293 | ||
2989ddbd | 294 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 295 | { |
159ec1fc | 296 | mdk_rdev_t *rdev; |
1da177e4 | 297 | |
159ec1fc | 298 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
299 | if (rdev->desc_nr == nr) |
300 | return rdev; | |
159ec1fc | 301 | |
1da177e4 LT |
302 | return NULL; |
303 | } | |
304 | ||
305 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
306 | { | |
1da177e4 LT |
307 | mdk_rdev_t *rdev; |
308 | ||
159ec1fc | 309 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
310 | if (rdev->bdev->bd_dev == dev) |
311 | return rdev; | |
159ec1fc | 312 | |
1da177e4 LT |
313 | return NULL; |
314 | } | |
315 | ||
d9d166c2 | 316 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
317 | { |
318 | struct mdk_personality *pers; | |
d9d166c2 N |
319 | list_for_each_entry(pers, &pers_list, list) { |
320 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 321 | return pers; |
d9d166c2 N |
322 | if (strcmp(pers->name, clevel)==0) |
323 | return pers; | |
324 | } | |
2604b703 N |
325 | return NULL; |
326 | } | |
327 | ||
b73df2d3 | 328 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 329 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 330 | { |
b73df2d3 AN |
331 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
332 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
333 | } |
334 | ||
e7debaa4 | 335 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 336 | { |
0f420358 | 337 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
338 | |
339 | if (chunk_size) | |
e7debaa4 AN |
340 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
341 | return num_sectors; | |
1da177e4 LT |
342 | } |
343 | ||
344 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
345 | { | |
346 | if (rdev->sb_page) | |
347 | MD_BUG(); | |
348 | ||
349 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
350 | if (!rdev->sb_page) { | |
351 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 352 | return -ENOMEM; |
1da177e4 LT |
353 | } |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | static void free_disk_sb(mdk_rdev_t * rdev) | |
359 | { | |
360 | if (rdev->sb_page) { | |
2d1f3b5d | 361 | put_page(rdev->sb_page); |
1da177e4 LT |
362 | rdev->sb_loaded = 0; |
363 | rdev->sb_page = NULL; | |
0f420358 | 364 | rdev->sb_start = 0; |
1da177e4 LT |
365 | rdev->size = 0; |
366 | } | |
367 | } | |
368 | ||
369 | ||
6712ecf8 | 370 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
371 | { |
372 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 373 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 374 | |
3a0f5bbb N |
375 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
376 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
377 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
378 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 379 | md_error(mddev, rdev); |
3a0f5bbb | 380 | } |
7bfa19f2 | 381 | |
a9701a30 N |
382 | if (atomic_dec_and_test(&mddev->pending_writes)) |
383 | wake_up(&mddev->sb_wait); | |
f8b58edf | 384 | bio_put(bio); |
7bfa19f2 N |
385 | } |
386 | ||
6712ecf8 | 387 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
388 | { |
389 | struct bio *bio2 = bio->bi_private; | |
390 | mdk_rdev_t *rdev = bio2->bi_private; | |
391 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
392 | |
393 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
394 | error == -EOPNOTSUPP) { | |
395 | unsigned long flags; | |
396 | /* barriers don't appear to be supported :-( */ | |
397 | set_bit(BarriersNotsupp, &rdev->flags); | |
398 | mddev->barriers_work = 0; | |
399 | spin_lock_irqsave(&mddev->write_lock, flags); | |
400 | bio2->bi_next = mddev->biolist; | |
401 | mddev->biolist = bio2; | |
402 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
403 | wake_up(&mddev->sb_wait); | |
404 | bio_put(bio); | |
6712ecf8 N |
405 | } else { |
406 | bio_put(bio2); | |
407 | bio->bi_private = rdev; | |
408 | super_written(bio, error); | |
a9701a30 | 409 | } |
a9701a30 N |
410 | } |
411 | ||
7bfa19f2 N |
412 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
413 | sector_t sector, int size, struct page *page) | |
414 | { | |
415 | /* write first size bytes of page to sector of rdev | |
416 | * Increment mddev->pending_writes before returning | |
417 | * and decrement it on completion, waking up sb_wait | |
418 | * if zero is reached. | |
419 | * If an error occurred, call md_error | |
a9701a30 N |
420 | * |
421 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
422 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
423 | */ |
424 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 425 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
426 | |
427 | bio->bi_bdev = rdev->bdev; | |
428 | bio->bi_sector = sector; | |
429 | bio_add_page(bio, page, size, 0); | |
430 | bio->bi_private = rdev; | |
431 | bio->bi_end_io = super_written; | |
a9701a30 N |
432 | bio->bi_rw = rw; |
433 | ||
7bfa19f2 | 434 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
435 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
436 | struct bio *rbio; | |
437 | rw |= (1<<BIO_RW_BARRIER); | |
438 | rbio = bio_clone(bio, GFP_NOIO); | |
439 | rbio->bi_private = bio; | |
440 | rbio->bi_end_io = super_written_barrier; | |
441 | submit_bio(rw, rbio); | |
442 | } else | |
443 | submit_bio(rw, bio); | |
444 | } | |
445 | ||
446 | void md_super_wait(mddev_t *mddev) | |
447 | { | |
448 | /* wait for all superblock writes that were scheduled to complete. | |
449 | * if any had to be retried (due to BARRIER problems), retry them | |
450 | */ | |
451 | DEFINE_WAIT(wq); | |
452 | for(;;) { | |
453 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
454 | if (atomic_read(&mddev->pending_writes)==0) | |
455 | break; | |
456 | while (mddev->biolist) { | |
457 | struct bio *bio; | |
458 | spin_lock_irq(&mddev->write_lock); | |
459 | bio = mddev->biolist; | |
460 | mddev->biolist = bio->bi_next ; | |
461 | bio->bi_next = NULL; | |
462 | spin_unlock_irq(&mddev->write_lock); | |
463 | submit_bio(bio->bi_rw, bio); | |
464 | } | |
465 | schedule(); | |
466 | } | |
467 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
468 | } |
469 | ||
6712ecf8 | 470 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 471 | { |
1da177e4 | 472 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
473 | } |
474 | ||
a654b9d8 | 475 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
476 | struct page *page, int rw) |
477 | { | |
baaa2c51 | 478 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
479 | struct completion event; |
480 | int ret; | |
481 | ||
482 | rw |= (1 << BIO_RW_SYNC); | |
483 | ||
484 | bio->bi_bdev = bdev; | |
485 | bio->bi_sector = sector; | |
486 | bio_add_page(bio, page, size, 0); | |
487 | init_completion(&event); | |
488 | bio->bi_private = &event; | |
489 | bio->bi_end_io = bi_complete; | |
490 | submit_bio(rw, bio); | |
491 | wait_for_completion(&event); | |
492 | ||
493 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
494 | bio_put(bio); | |
495 | return ret; | |
496 | } | |
a8745db2 | 497 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 498 | |
0002b271 | 499 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
500 | { |
501 | char b[BDEVNAME_SIZE]; | |
502 | if (!rdev->sb_page) { | |
503 | MD_BUG(); | |
504 | return -EINVAL; | |
505 | } | |
506 | if (rdev->sb_loaded) | |
507 | return 0; | |
508 | ||
509 | ||
0f420358 | 510 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
511 | goto fail; |
512 | rdev->sb_loaded = 1; | |
513 | return 0; | |
514 | ||
515 | fail: | |
516 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
517 | bdevname(rdev->bdev,b)); | |
518 | return -EINVAL; | |
519 | } | |
520 | ||
521 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
522 | { | |
05710466 AN |
523 | return sb1->set_uuid0 == sb2->set_uuid0 && |
524 | sb1->set_uuid1 == sb2->set_uuid1 && | |
525 | sb1->set_uuid2 == sb2->set_uuid2 && | |
526 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
527 | } |
528 | ||
1da177e4 LT |
529 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
530 | { | |
531 | int ret; | |
532 | mdp_super_t *tmp1, *tmp2; | |
533 | ||
534 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
535 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
536 | ||
537 | if (!tmp1 || !tmp2) { | |
538 | ret = 0; | |
35020f1a | 539 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
540 | goto abort; |
541 | } | |
542 | ||
543 | *tmp1 = *sb1; | |
544 | *tmp2 = *sb2; | |
545 | ||
546 | /* | |
547 | * nr_disks is not constant | |
548 | */ | |
549 | tmp1->nr_disks = 0; | |
550 | tmp2->nr_disks = 0; | |
551 | ||
ce0c8e05 | 552 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 553 | abort: |
990a8baf JJ |
554 | kfree(tmp1); |
555 | kfree(tmp2); | |
1da177e4 LT |
556 | return ret; |
557 | } | |
558 | ||
4d167f09 N |
559 | |
560 | static u32 md_csum_fold(u32 csum) | |
561 | { | |
562 | csum = (csum & 0xffff) + (csum >> 16); | |
563 | return (csum & 0xffff) + (csum >> 16); | |
564 | } | |
565 | ||
1da177e4 LT |
566 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
567 | { | |
4d167f09 N |
568 | u64 newcsum = 0; |
569 | u32 *sb32 = (u32*)sb; | |
570 | int i; | |
1da177e4 LT |
571 | unsigned int disk_csum, csum; |
572 | ||
573 | disk_csum = sb->sb_csum; | |
574 | sb->sb_csum = 0; | |
4d167f09 N |
575 | |
576 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
577 | newcsum += sb32[i]; | |
578 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
579 | ||
580 | ||
581 | #ifdef CONFIG_ALPHA | |
582 | /* This used to use csum_partial, which was wrong for several | |
583 | * reasons including that different results are returned on | |
584 | * different architectures. It isn't critical that we get exactly | |
585 | * the same return value as before (we always csum_fold before | |
586 | * testing, and that removes any differences). However as we | |
587 | * know that csum_partial always returned a 16bit value on | |
588 | * alphas, do a fold to maximise conformity to previous behaviour. | |
589 | */ | |
590 | sb->sb_csum = md_csum_fold(disk_csum); | |
591 | #else | |
1da177e4 | 592 | sb->sb_csum = disk_csum; |
4d167f09 | 593 | #endif |
1da177e4 LT |
594 | return csum; |
595 | } | |
596 | ||
597 | ||
598 | /* | |
599 | * Handle superblock details. | |
600 | * We want to be able to handle multiple superblock formats | |
601 | * so we have a common interface to them all, and an array of | |
602 | * different handlers. | |
603 | * We rely on user-space to write the initial superblock, and support | |
604 | * reading and updating of superblocks. | |
605 | * Interface methods are: | |
606 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
607 | * loads and validates a superblock on dev. | |
608 | * if refdev != NULL, compare superblocks on both devices | |
609 | * Return: | |
610 | * 0 - dev has a superblock that is compatible with refdev | |
611 | * 1 - dev has a superblock that is compatible and newer than refdev | |
612 | * so dev should be used as the refdev in future | |
613 | * -EINVAL superblock incompatible or invalid | |
614 | * -othererror e.g. -EIO | |
615 | * | |
616 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
617 | * Verify that dev is acceptable into mddev. | |
618 | * The first time, mddev->raid_disks will be 0, and data from | |
619 | * dev should be merged in. Subsequent calls check that dev | |
620 | * is new enough. Return 0 or -EINVAL | |
621 | * | |
622 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
623 | * Update the superblock for rdev with data in mddev | |
624 | * This does not write to disc. | |
625 | * | |
626 | */ | |
627 | ||
628 | struct super_type { | |
0cd17fec CW |
629 | char *name; |
630 | struct module *owner; | |
631 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
632 | int minor_version); | |
633 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
634 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
635 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 636 | sector_t num_sectors); |
1da177e4 LT |
637 | }; |
638 | ||
639 | /* | |
640 | * load_super for 0.90.0 | |
641 | */ | |
642 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
643 | { | |
644 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
645 | mdp_super_t *sb; | |
646 | int ret; | |
1da177e4 LT |
647 | |
648 | /* | |
0f420358 | 649 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
650 | * it's at the end of the disk. |
651 | * | |
652 | * It also happens to be a multiple of 4Kb. | |
653 | */ | |
0f420358 | 654 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 655 | |
0002b271 | 656 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
657 | if (ret) return ret; |
658 | ||
659 | ret = -EINVAL; | |
660 | ||
661 | bdevname(rdev->bdev, b); | |
662 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
663 | ||
664 | if (sb->md_magic != MD_SB_MAGIC) { | |
665 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
666 | b); | |
667 | goto abort; | |
668 | } | |
669 | ||
670 | if (sb->major_version != 0 || | |
f6705578 N |
671 | sb->minor_version < 90 || |
672 | sb->minor_version > 91) { | |
1da177e4 LT |
673 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
674 | sb->major_version, sb->minor_version, | |
675 | b); | |
676 | goto abort; | |
677 | } | |
678 | ||
679 | if (sb->raid_disks <= 0) | |
680 | goto abort; | |
681 | ||
4d167f09 | 682 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
683 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
684 | b); | |
685 | goto abort; | |
686 | } | |
687 | ||
688 | rdev->preferred_minor = sb->md_minor; | |
689 | rdev->data_offset = 0; | |
0002b271 | 690 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 691 | |
e11e93fa N |
692 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
693 | if (sb->level != 1 && sb->level != 4 | |
694 | && sb->level != 5 && sb->level != 6 | |
695 | && sb->level != 10) { | |
696 | /* FIXME use a better test */ | |
697 | printk(KERN_WARNING | |
698 | "md: bitmaps not supported for this level.\n"); | |
699 | goto abort; | |
700 | } | |
701 | } | |
702 | ||
1da177e4 LT |
703 | if (sb->level == LEVEL_MULTIPATH) |
704 | rdev->desc_nr = -1; | |
705 | else | |
706 | rdev->desc_nr = sb->this_disk.number; | |
707 | ||
9a7b2b0f | 708 | if (!refdev) { |
1da177e4 | 709 | ret = 1; |
9a7b2b0f | 710 | } else { |
1da177e4 LT |
711 | __u64 ev1, ev2; |
712 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
713 | if (!uuid_equal(refsb, sb)) { | |
714 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
715 | b, bdevname(refdev->bdev,b2)); | |
716 | goto abort; | |
717 | } | |
718 | if (!sb_equal(refsb, sb)) { | |
719 | printk(KERN_WARNING "md: %s has same UUID" | |
720 | " but different superblock to %s\n", | |
721 | b, bdevname(refdev->bdev, b2)); | |
722 | goto abort; | |
723 | } | |
724 | ev1 = md_event(sb); | |
725 | ev2 = md_event(refsb); | |
726 | if (ev1 > ev2) | |
727 | ret = 1; | |
728 | else | |
729 | ret = 0; | |
730 | } | |
e7debaa4 | 731 | rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2; |
1da177e4 | 732 | |
2bf071bf N |
733 | if (rdev->size < sb->size && sb->level > 1) |
734 | /* "this cannot possibly happen" ... */ | |
735 | ret = -EINVAL; | |
736 | ||
1da177e4 LT |
737 | abort: |
738 | return ret; | |
739 | } | |
740 | ||
741 | /* | |
742 | * validate_super for 0.90.0 | |
743 | */ | |
744 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
745 | { | |
746 | mdp_disk_t *desc; | |
747 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 748 | __u64 ev1 = md_event(sb); |
1da177e4 | 749 | |
41158c7e | 750 | rdev->raid_disk = -1; |
c5d79adb N |
751 | clear_bit(Faulty, &rdev->flags); |
752 | clear_bit(In_sync, &rdev->flags); | |
753 | clear_bit(WriteMostly, &rdev->flags); | |
754 | clear_bit(BarriersNotsupp, &rdev->flags); | |
755 | ||
1da177e4 LT |
756 | if (mddev->raid_disks == 0) { |
757 | mddev->major_version = 0; | |
758 | mddev->minor_version = sb->minor_version; | |
759 | mddev->patch_version = sb->patch_version; | |
e691063a | 760 | mddev->external = 0; |
1da177e4 LT |
761 | mddev->chunk_size = sb->chunk_size; |
762 | mddev->ctime = sb->ctime; | |
763 | mddev->utime = sb->utime; | |
764 | mddev->level = sb->level; | |
d9d166c2 | 765 | mddev->clevel[0] = 0; |
1da177e4 LT |
766 | mddev->layout = sb->layout; |
767 | mddev->raid_disks = sb->raid_disks; | |
768 | mddev->size = sb->size; | |
07d84d10 | 769 | mddev->events = ev1; |
9223214e | 770 | mddev->bitmap_offset = 0; |
36fa3063 | 771 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 772 | |
f6705578 N |
773 | if (mddev->minor_version >= 91) { |
774 | mddev->reshape_position = sb->reshape_position; | |
775 | mddev->delta_disks = sb->delta_disks; | |
776 | mddev->new_level = sb->new_level; | |
777 | mddev->new_layout = sb->new_layout; | |
778 | mddev->new_chunk = sb->new_chunk; | |
779 | } else { | |
780 | mddev->reshape_position = MaxSector; | |
781 | mddev->delta_disks = 0; | |
782 | mddev->new_level = mddev->level; | |
783 | mddev->new_layout = mddev->layout; | |
784 | mddev->new_chunk = mddev->chunk_size; | |
785 | } | |
786 | ||
1da177e4 LT |
787 | if (sb->state & (1<<MD_SB_CLEAN)) |
788 | mddev->recovery_cp = MaxSector; | |
789 | else { | |
790 | if (sb->events_hi == sb->cp_events_hi && | |
791 | sb->events_lo == sb->cp_events_lo) { | |
792 | mddev->recovery_cp = sb->recovery_cp; | |
793 | } else | |
794 | mddev->recovery_cp = 0; | |
795 | } | |
796 | ||
797 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
798 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
799 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
800 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
801 | ||
802 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
803 | |
804 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 805 | mddev->bitmap_file == NULL) |
36fa3063 | 806 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 807 | |
41158c7e N |
808 | } else if (mddev->pers == NULL) { |
809 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
810 | ++ev1; |
811 | if (ev1 < mddev->events) | |
812 | return -EINVAL; | |
41158c7e N |
813 | } else if (mddev->bitmap) { |
814 | /* if adding to array with a bitmap, then we can accept an | |
815 | * older device ... but not too old. | |
816 | */ | |
41158c7e N |
817 | if (ev1 < mddev->bitmap->events_cleared) |
818 | return 0; | |
07d84d10 N |
819 | } else { |
820 | if (ev1 < mddev->events) | |
821 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
822 | return 0; | |
823 | } | |
41158c7e | 824 | |
1da177e4 | 825 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
826 | desc = sb->disks + rdev->desc_nr; |
827 | ||
828 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 829 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
830 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
831 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 832 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
833 | rdev->raid_disk = desc->raid_disk; |
834 | } | |
8ddf9efe N |
835 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
836 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 837 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 838 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
839 | return 0; |
840 | } | |
841 | ||
842 | /* | |
843 | * sync_super for 0.90.0 | |
844 | */ | |
845 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
846 | { | |
847 | mdp_super_t *sb; | |
1da177e4 LT |
848 | mdk_rdev_t *rdev2; |
849 | int next_spare = mddev->raid_disks; | |
19133a42 | 850 | |
1da177e4 LT |
851 | |
852 | /* make rdev->sb match mddev data.. | |
853 | * | |
854 | * 1/ zero out disks | |
855 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
856 | * 3/ any empty disks < next_spare become removed | |
857 | * | |
858 | * disks[0] gets initialised to REMOVED because | |
859 | * we cannot be sure from other fields if it has | |
860 | * been initialised or not. | |
861 | */ | |
862 | int i; | |
863 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
864 | ||
61181565 N |
865 | rdev->sb_size = MD_SB_BYTES; |
866 | ||
1da177e4 LT |
867 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
868 | ||
869 | memset(sb, 0, sizeof(*sb)); | |
870 | ||
871 | sb->md_magic = MD_SB_MAGIC; | |
872 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
873 | sb->patch_version = mddev->patch_version; |
874 | sb->gvalid_words = 0; /* ignored */ | |
875 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
876 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
877 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
878 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
879 | ||
880 | sb->ctime = mddev->ctime; | |
881 | sb->level = mddev->level; | |
882 | sb->size = mddev->size; | |
883 | sb->raid_disks = mddev->raid_disks; | |
884 | sb->md_minor = mddev->md_minor; | |
e691063a | 885 | sb->not_persistent = 0; |
1da177e4 LT |
886 | sb->utime = mddev->utime; |
887 | sb->state = 0; | |
888 | sb->events_hi = (mddev->events>>32); | |
889 | sb->events_lo = (u32)mddev->events; | |
890 | ||
f6705578 N |
891 | if (mddev->reshape_position == MaxSector) |
892 | sb->minor_version = 90; | |
893 | else { | |
894 | sb->minor_version = 91; | |
895 | sb->reshape_position = mddev->reshape_position; | |
896 | sb->new_level = mddev->new_level; | |
897 | sb->delta_disks = mddev->delta_disks; | |
898 | sb->new_layout = mddev->new_layout; | |
899 | sb->new_chunk = mddev->new_chunk; | |
900 | } | |
901 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
902 | if (mddev->in_sync) |
903 | { | |
904 | sb->recovery_cp = mddev->recovery_cp; | |
905 | sb->cp_events_hi = (mddev->events>>32); | |
906 | sb->cp_events_lo = (u32)mddev->events; | |
907 | if (mddev->recovery_cp == MaxSector) | |
908 | sb->state = (1<< MD_SB_CLEAN); | |
909 | } else | |
910 | sb->recovery_cp = 0; | |
911 | ||
912 | sb->layout = mddev->layout; | |
913 | sb->chunk_size = mddev->chunk_size; | |
914 | ||
a654b9d8 N |
915 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
916 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
917 | ||
1da177e4 | 918 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 919 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 920 | mdp_disk_t *d; |
86e6ffdd | 921 | int desc_nr; |
b2d444d7 N |
922 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
923 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 924 | desc_nr = rdev2->raid_disk; |
1da177e4 | 925 | else |
86e6ffdd | 926 | desc_nr = next_spare++; |
19133a42 | 927 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
928 | d = &sb->disks[rdev2->desc_nr]; |
929 | nr_disks++; | |
930 | d->number = rdev2->desc_nr; | |
931 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
932 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
933 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
934 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
935 | d->raid_disk = rdev2->raid_disk; |
936 | else | |
937 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 938 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 939 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 940 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
941 | d->state = (1<<MD_DISK_ACTIVE); |
942 | d->state |= (1<<MD_DISK_SYNC); | |
943 | active++; | |
944 | working++; | |
945 | } else { | |
946 | d->state = 0; | |
947 | spare++; | |
948 | working++; | |
949 | } | |
8ddf9efe N |
950 | if (test_bit(WriteMostly, &rdev2->flags)) |
951 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 952 | } |
1da177e4 LT |
953 | /* now set the "removed" and "faulty" bits on any missing devices */ |
954 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
955 | mdp_disk_t *d = &sb->disks[i]; | |
956 | if (d->state == 0 && d->number == 0) { | |
957 | d->number = i; | |
958 | d->raid_disk = i; | |
959 | d->state = (1<<MD_DISK_REMOVED); | |
960 | d->state |= (1<<MD_DISK_FAULTY); | |
961 | failed++; | |
962 | } | |
963 | } | |
964 | sb->nr_disks = nr_disks; | |
965 | sb->active_disks = active; | |
966 | sb->working_disks = working; | |
967 | sb->failed_disks = failed; | |
968 | sb->spare_disks = spare; | |
969 | ||
970 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
971 | sb->sb_csum = calc_sb_csum(sb); | |
972 | } | |
973 | ||
0cd17fec CW |
974 | /* |
975 | * rdev_size_change for 0.90.0 | |
976 | */ | |
977 | static unsigned long long | |
15f4a5fd | 978 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 979 | { |
15f4a5fd | 980 | if (num_sectors && num_sectors < rdev->mddev->size * 2) |
0cd17fec | 981 | return 0; /* component must fit device */ |
0cd17fec CW |
982 | if (rdev->mddev->bitmap_offset) |
983 | return 0; /* can't move bitmap */ | |
0f420358 | 984 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
985 | if (!num_sectors || num_sectors > rdev->sb_start) |
986 | num_sectors = rdev->sb_start; | |
0f420358 | 987 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
988 | rdev->sb_page); |
989 | md_super_wait(rdev->mddev); | |
15f4a5fd | 990 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
991 | } |
992 | ||
993 | ||
1da177e4 LT |
994 | /* |
995 | * version 1 superblock | |
996 | */ | |
997 | ||
1c05b4bc | 998 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 999 | { |
1c05b4bc N |
1000 | __le32 disk_csum; |
1001 | u32 csum; | |
1da177e4 LT |
1002 | unsigned long long newcsum; |
1003 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1004 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1005 | int i; |
1006 | ||
1007 | disk_csum = sb->sb_csum; | |
1008 | sb->sb_csum = 0; | |
1009 | newcsum = 0; | |
1010 | for (i=0; size>=4; size -= 4 ) | |
1011 | newcsum += le32_to_cpu(*isuper++); | |
1012 | ||
1013 | if (size == 2) | |
1c05b4bc | 1014 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1015 | |
1016 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1017 | sb->sb_csum = disk_csum; | |
1018 | return cpu_to_le32(csum); | |
1019 | } | |
1020 | ||
1021 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1022 | { | |
1023 | struct mdp_superblock_1 *sb; | |
1024 | int ret; | |
0f420358 | 1025 | sector_t sb_start; |
1da177e4 | 1026 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1027 | int bmask; |
1da177e4 LT |
1028 | |
1029 | /* | |
0f420358 | 1030 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1031 | * It is always aligned to a 4K boundary and |
1032 | * depeding on minor_version, it can be: | |
1033 | * 0: At least 8K, but less than 12K, from end of device | |
1034 | * 1: At start of device | |
1035 | * 2: 4K from start of device. | |
1036 | */ | |
1037 | switch(minor_version) { | |
1038 | case 0: | |
0f420358 AN |
1039 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1040 | sb_start -= 8*2; | |
1041 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1042 | break; |
1043 | case 1: | |
0f420358 | 1044 | sb_start = 0; |
1da177e4 LT |
1045 | break; |
1046 | case 2: | |
0f420358 | 1047 | sb_start = 8; |
1da177e4 LT |
1048 | break; |
1049 | default: | |
1050 | return -EINVAL; | |
1051 | } | |
0f420358 | 1052 | rdev->sb_start = sb_start; |
1da177e4 | 1053 | |
0002b271 N |
1054 | /* superblock is rarely larger than 1K, but it can be larger, |
1055 | * and it is safe to read 4k, so we do that | |
1056 | */ | |
1057 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1058 | if (ret) return ret; |
1059 | ||
1060 | ||
1061 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1062 | ||
1063 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1064 | sb->major_version != cpu_to_le32(1) || | |
1065 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1066 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1067 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1068 | return -EINVAL; |
1069 | ||
1070 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1071 | printk("md: invalid superblock checksum on %s\n", | |
1072 | bdevname(rdev->bdev,b)); | |
1073 | return -EINVAL; | |
1074 | } | |
1075 | if (le64_to_cpu(sb->data_size) < 10) { | |
1076 | printk("md: data_size too small on %s\n", | |
1077 | bdevname(rdev->bdev,b)); | |
1078 | return -EINVAL; | |
1079 | } | |
e11e93fa N |
1080 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1081 | if (sb->level != cpu_to_le32(1) && | |
1082 | sb->level != cpu_to_le32(4) && | |
1083 | sb->level != cpu_to_le32(5) && | |
1084 | sb->level != cpu_to_le32(6) && | |
1085 | sb->level != cpu_to_le32(10)) { | |
1086 | printk(KERN_WARNING | |
1087 | "md: bitmaps not supported for this level.\n"); | |
1088 | return -EINVAL; | |
1089 | } | |
1090 | } | |
1091 | ||
1da177e4 LT |
1092 | rdev->preferred_minor = 0xffff; |
1093 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1094 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1095 | |
0002b271 | 1096 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1097 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1098 | if (rdev->sb_size & bmask) |
a1801f85 N |
1099 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1100 | ||
1101 | if (minor_version | |
0f420358 | 1102 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1103 | return -EINVAL; |
0002b271 | 1104 | |
31b65a0d N |
1105 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1106 | rdev->desc_nr = -1; | |
1107 | else | |
1108 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1109 | ||
9a7b2b0f | 1110 | if (!refdev) { |
8ed75463 | 1111 | ret = 1; |
9a7b2b0f | 1112 | } else { |
1da177e4 LT |
1113 | __u64 ev1, ev2; |
1114 | struct mdp_superblock_1 *refsb = | |
1115 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1116 | ||
1117 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1118 | sb->level != refsb->level || | |
1119 | sb->layout != refsb->layout || | |
1120 | sb->chunksize != refsb->chunksize) { | |
1121 | printk(KERN_WARNING "md: %s has strangely different" | |
1122 | " superblock to %s\n", | |
1123 | bdevname(rdev->bdev,b), | |
1124 | bdevname(refdev->bdev,b2)); | |
1125 | return -EINVAL; | |
1126 | } | |
1127 | ev1 = le64_to_cpu(sb->events); | |
1128 | ev2 = le64_to_cpu(refsb->events); | |
1129 | ||
1130 | if (ev1 > ev2) | |
8ed75463 N |
1131 | ret = 1; |
1132 | else | |
1133 | ret = 0; | |
1da177e4 | 1134 | } |
a1801f85 | 1135 | if (minor_version) |
1da177e4 LT |
1136 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; |
1137 | else | |
0f420358 | 1138 | rdev->size = rdev->sb_start / 2; |
1da177e4 LT |
1139 | if (rdev->size < le64_to_cpu(sb->data_size)/2) |
1140 | return -EINVAL; | |
1141 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1142 | if (le32_to_cpu(sb->chunksize)) | |
1143 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1144 | |
1c05b4bc | 1145 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1146 | return -EINVAL; |
8ed75463 | 1147 | return ret; |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1151 | { | |
1152 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1153 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1154 | |
41158c7e | 1155 | rdev->raid_disk = -1; |
c5d79adb N |
1156 | clear_bit(Faulty, &rdev->flags); |
1157 | clear_bit(In_sync, &rdev->flags); | |
1158 | clear_bit(WriteMostly, &rdev->flags); | |
1159 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1160 | ||
1da177e4 LT |
1161 | if (mddev->raid_disks == 0) { |
1162 | mddev->major_version = 1; | |
1163 | mddev->patch_version = 0; | |
e691063a | 1164 | mddev->external = 0; |
1da177e4 LT |
1165 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1166 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1167 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1168 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1169 | mddev->clevel[0] = 0; |
1da177e4 LT |
1170 | mddev->layout = le32_to_cpu(sb->layout); |
1171 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1172 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1173 | mddev->events = ev1; |
9223214e | 1174 | mddev->bitmap_offset = 0; |
29fc7e3e | 1175 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1176 | |
1177 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1178 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1179 | ||
1180 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1181 | |
71c0805c | 1182 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1183 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1184 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1185 | |
f6705578 N |
1186 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1187 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1188 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1189 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1190 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1191 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1192 | } else { | |
1193 | mddev->reshape_position = MaxSector; | |
1194 | mddev->delta_disks = 0; | |
1195 | mddev->new_level = mddev->level; | |
1196 | mddev->new_layout = mddev->layout; | |
1197 | mddev->new_chunk = mddev->chunk_size; | |
1198 | } | |
1199 | ||
41158c7e N |
1200 | } else if (mddev->pers == NULL) { |
1201 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1202 | ++ev1; |
1203 | if (ev1 < mddev->events) | |
1204 | return -EINVAL; | |
41158c7e N |
1205 | } else if (mddev->bitmap) { |
1206 | /* If adding to array with a bitmap, then we can accept an | |
1207 | * older device, but not too old. | |
1208 | */ | |
41158c7e N |
1209 | if (ev1 < mddev->bitmap->events_cleared) |
1210 | return 0; | |
07d84d10 N |
1211 | } else { |
1212 | if (ev1 < mddev->events) | |
1213 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1214 | return 0; | |
1215 | } | |
1da177e4 LT |
1216 | if (mddev->level != LEVEL_MULTIPATH) { |
1217 | int role; | |
1da177e4 LT |
1218 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1219 | switch(role) { | |
1220 | case 0xffff: /* spare */ | |
1da177e4 LT |
1221 | break; |
1222 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1223 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1224 | break; |
1225 | default: | |
5fd6c1dc N |
1226 | if ((le32_to_cpu(sb->feature_map) & |
1227 | MD_FEATURE_RECOVERY_OFFSET)) | |
1228 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1229 | else | |
1230 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1231 | rdev->raid_disk = role; |
1232 | break; | |
1233 | } | |
8ddf9efe N |
1234 | if (sb->devflags & WriteMostly1) |
1235 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1236 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1237 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1238 | |
1da177e4 LT |
1239 | return 0; |
1240 | } | |
1241 | ||
1242 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1243 | { | |
1244 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1245 | mdk_rdev_t *rdev2; |
1246 | int max_dev, i; | |
1247 | /* make rdev->sb match mddev and rdev data. */ | |
1248 | ||
1249 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1250 | ||
1251 | sb->feature_map = 0; | |
1252 | sb->pad0 = 0; | |
5fd6c1dc | 1253 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1254 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1255 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1256 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1257 | ||
1258 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1259 | sb->events = cpu_to_le64(mddev->events); | |
1260 | if (mddev->in_sync) | |
1261 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1262 | else | |
1263 | sb->resync_offset = cpu_to_le64(0); | |
1264 | ||
1c05b4bc | 1265 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1266 | |
f0ca340c | 1267 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1268 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1269 | |
a654b9d8 N |
1270 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1271 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1272 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1273 | } |
5fd6c1dc N |
1274 | |
1275 | if (rdev->raid_disk >= 0 && | |
1276 | !test_bit(In_sync, &rdev->flags) && | |
1277 | rdev->recovery_offset > 0) { | |
1278 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1279 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1280 | } | |
1281 | ||
f6705578 N |
1282 | if (mddev->reshape_position != MaxSector) { |
1283 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1284 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1285 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1286 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1287 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1288 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1289 | } | |
a654b9d8 | 1290 | |
1da177e4 | 1291 | max_dev = 0; |
159ec1fc | 1292 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1293 | if (rdev2->desc_nr+1 > max_dev) |
1294 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1295 | |
1296 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1297 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1298 | for (i=0; i<max_dev;i++) |
1299 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1300 | ||
159ec1fc | 1301 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1302 | i = rdev2->desc_nr; |
b2d444d7 | 1303 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1304 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1305 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1306 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1307 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1308 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1309 | else |
1310 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1311 | } | |
1312 | ||
1da177e4 LT |
1313 | sb->sb_csum = calc_sb_1_csum(sb); |
1314 | } | |
1315 | ||
0cd17fec | 1316 | static unsigned long long |
15f4a5fd | 1317 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1318 | { |
1319 | struct mdp_superblock_1 *sb; | |
15f4a5fd AN |
1320 | sector_t max_sectors; |
1321 | if (num_sectors && num_sectors < rdev->mddev->size * 2) | |
0cd17fec | 1322 | return 0; /* component must fit device */ |
0f420358 | 1323 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1324 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1325 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1326 | max_sectors -= rdev->data_offset; | |
1327 | if (!num_sectors || num_sectors > max_sectors) | |
1328 | num_sectors = max_sectors; | |
0cd17fec CW |
1329 | } else if (rdev->mddev->bitmap_offset) { |
1330 | /* minor version 0 with bitmap we can't move */ | |
1331 | return 0; | |
1332 | } else { | |
1333 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1334 | sector_t sb_start; |
1335 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1336 | sb_start &= ~(sector_t)(4*2 - 1); | |
15f4a5fd AN |
1337 | max_sectors = rdev->size * 2 + sb_start - rdev->sb_start; |
1338 | if (!num_sectors || num_sectors > max_sectors) | |
1339 | num_sectors = max_sectors; | |
0f420358 | 1340 | rdev->sb_start = sb_start; |
0cd17fec CW |
1341 | } |
1342 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1343 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1344 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1345 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1346 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1347 | rdev->sb_page); |
1348 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1349 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1350 | } |
1da177e4 | 1351 | |
75c96f85 | 1352 | static struct super_type super_types[] = { |
1da177e4 LT |
1353 | [0] = { |
1354 | .name = "0.90.0", | |
1355 | .owner = THIS_MODULE, | |
0cd17fec CW |
1356 | .load_super = super_90_load, |
1357 | .validate_super = super_90_validate, | |
1358 | .sync_super = super_90_sync, | |
1359 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1360 | }, |
1361 | [1] = { | |
1362 | .name = "md-1", | |
1363 | .owner = THIS_MODULE, | |
0cd17fec CW |
1364 | .load_super = super_1_load, |
1365 | .validate_super = super_1_validate, | |
1366 | .sync_super = super_1_sync, | |
1367 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1368 | }, |
1369 | }; | |
1da177e4 LT |
1370 | |
1371 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1372 | { | |
7dd5e7c3 | 1373 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1374 | |
4b80991c N |
1375 | rcu_read_lock(); |
1376 | rdev_for_each_rcu(rdev, mddev1) | |
1377 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1378 | if (rdev->bdev->bd_contains == |
4b80991c N |
1379 | rdev2->bdev->bd_contains) { |
1380 | rcu_read_unlock(); | |
7dd5e7c3 | 1381 | return 1; |
4b80991c N |
1382 | } |
1383 | rcu_read_unlock(); | |
1da177e4 LT |
1384 | return 0; |
1385 | } | |
1386 | ||
1387 | static LIST_HEAD(pending_raid_disks); | |
1388 | ||
1389 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1390 | { | |
7dd5e7c3 | 1391 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1392 | struct kobject *ko; |
1edf80d3 | 1393 | char *s; |
5e55e2f5 | 1394 | int err; |
1da177e4 LT |
1395 | |
1396 | if (rdev->mddev) { | |
1397 | MD_BUG(); | |
1398 | return -EINVAL; | |
1399 | } | |
11e2ede0 DW |
1400 | |
1401 | /* prevent duplicates */ | |
1402 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1403 | return -EEXIST; | |
1404 | ||
2bf071bf N |
1405 | /* make sure rdev->size exceeds mddev->size */ |
1406 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1407 | if (mddev->pers) { |
1408 | /* Cannot change size, so fail | |
1409 | * If mddev->level <= 0, then we don't care | |
1410 | * about aligning sizes (e.g. linear) | |
1411 | */ | |
1412 | if (mddev->level > 0) | |
1413 | return -ENOSPC; | |
1414 | } else | |
2bf071bf N |
1415 | mddev->size = rdev->size; |
1416 | } | |
1da177e4 LT |
1417 | |
1418 | /* Verify rdev->desc_nr is unique. | |
1419 | * If it is -1, assign a free number, else | |
1420 | * check number is not in use | |
1421 | */ | |
1422 | if (rdev->desc_nr < 0) { | |
1423 | int choice = 0; | |
1424 | if (mddev->pers) choice = mddev->raid_disks; | |
1425 | while (find_rdev_nr(mddev, choice)) | |
1426 | choice++; | |
1427 | rdev->desc_nr = choice; | |
1428 | } else { | |
1429 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1430 | return -EBUSY; | |
1431 | } | |
19133a42 | 1432 | bdevname(rdev->bdev,b); |
649316b2 | 1433 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1434 | *s = '!'; |
649316b2 | 1435 | |
1da177e4 | 1436 | rdev->mddev = mddev; |
19133a42 | 1437 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1438 | |
b2d6db58 | 1439 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1440 | goto fail; |
86e6ffdd | 1441 | |
0762b8bd | 1442 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1443 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1444 | kobject_del(&rdev->kobj); | |
1445 | goto fail; | |
1446 | } | |
3c0ee63a N |
1447 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1448 | ||
4b80991c | 1449 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1450 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
1da177e4 | 1451 | return 0; |
5e55e2f5 N |
1452 | |
1453 | fail: | |
1454 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1455 | b, mdname(mddev)); | |
1456 | return err; | |
1da177e4 LT |
1457 | } |
1458 | ||
177a99b2 | 1459 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1460 | { |
1461 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1462 | kobject_del(&rdev->kobj); | |
177a99b2 | 1463 | kobject_put(&rdev->kobj); |
5792a285 N |
1464 | } |
1465 | ||
1da177e4 LT |
1466 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1467 | { | |
1468 | char b[BDEVNAME_SIZE]; | |
1469 | if (!rdev->mddev) { | |
1470 | MD_BUG(); | |
1471 | return; | |
1472 | } | |
5463c790 | 1473 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1474 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1475 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1476 | rdev->mddev = NULL; | |
86e6ffdd | 1477 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1478 | sysfs_put(rdev->sysfs_state); |
1479 | rdev->sysfs_state = NULL; | |
5792a285 | 1480 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1481 | * writing to 'remove' to "dev/state". We also need |
1482 | * to delay it due to rcu usage. | |
5792a285 | 1483 | */ |
4b80991c | 1484 | synchronize_rcu(); |
177a99b2 N |
1485 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1486 | kobject_get(&rdev->kobj); | |
5792a285 | 1487 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1488 | } |
1489 | ||
1490 | /* | |
1491 | * prevent the device from being mounted, repartitioned or | |
1492 | * otherwise reused by a RAID array (or any other kernel | |
1493 | * subsystem), by bd_claiming the device. | |
1494 | */ | |
c5d79adb | 1495 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1496 | { |
1497 | int err = 0; | |
1498 | struct block_device *bdev; | |
1499 | char b[BDEVNAME_SIZE]; | |
1500 | ||
2e7b651d | 1501 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1502 | if (IS_ERR(bdev)) { |
1503 | printk(KERN_ERR "md: could not open %s.\n", | |
1504 | __bdevname(dev, b)); | |
1505 | return PTR_ERR(bdev); | |
1506 | } | |
c5d79adb | 1507 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1508 | if (err) { |
1509 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1510 | bdevname(bdev, b)); | |
9a1c3542 | 1511 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1512 | return err; |
1513 | } | |
c5d79adb N |
1514 | if (!shared) |
1515 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1516 | rdev->bdev = bdev; |
1517 | return err; | |
1518 | } | |
1519 | ||
1520 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1521 | { | |
1522 | struct block_device *bdev = rdev->bdev; | |
1523 | rdev->bdev = NULL; | |
1524 | if (!bdev) | |
1525 | MD_BUG(); | |
1526 | bd_release(bdev); | |
9a1c3542 | 1527 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1528 | } |
1529 | ||
1530 | void md_autodetect_dev(dev_t dev); | |
1531 | ||
1532 | static void export_rdev(mdk_rdev_t * rdev) | |
1533 | { | |
1534 | char b[BDEVNAME_SIZE]; | |
1535 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1536 | bdevname(rdev->bdev,b)); | |
1537 | if (rdev->mddev) | |
1538 | MD_BUG(); | |
1539 | free_disk_sb(rdev); | |
1da177e4 | 1540 | #ifndef MODULE |
d0fae18f N |
1541 | if (test_bit(AutoDetected, &rdev->flags)) |
1542 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1543 | #endif |
1544 | unlock_rdev(rdev); | |
86e6ffdd | 1545 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1546 | } |
1547 | ||
1548 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1549 | { | |
1550 | unbind_rdev_from_array(rdev); | |
1551 | export_rdev(rdev); | |
1552 | } | |
1553 | ||
1554 | static void export_array(mddev_t *mddev) | |
1555 | { | |
159ec1fc | 1556 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1557 | |
d089c6af | 1558 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1559 | if (!rdev->mddev) { |
1560 | MD_BUG(); | |
1561 | continue; | |
1562 | } | |
1563 | kick_rdev_from_array(rdev); | |
1564 | } | |
1565 | if (!list_empty(&mddev->disks)) | |
1566 | MD_BUG(); | |
1567 | mddev->raid_disks = 0; | |
1568 | mddev->major_version = 0; | |
1569 | } | |
1570 | ||
1571 | static void print_desc(mdp_disk_t *desc) | |
1572 | { | |
1573 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1574 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1575 | } | |
1576 | ||
cd2ac932 | 1577 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1578 | { |
1579 | int i; | |
1580 | ||
1581 | printk(KERN_INFO | |
1582 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1583 | sb->major_version, sb->minor_version, sb->patch_version, | |
1584 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1585 | sb->ctime); | |
1586 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1587 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1588 | sb->md_minor, sb->layout, sb->chunk_size); | |
1589 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1590 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1591 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1592 | sb->failed_disks, sb->spare_disks, | |
1593 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1594 | ||
1595 | printk(KERN_INFO); | |
1596 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1597 | mdp_disk_t *desc; | |
1598 | ||
1599 | desc = sb->disks + i; | |
1600 | if (desc->number || desc->major || desc->minor || | |
1601 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1602 | printk(" D %2d: ", i); | |
1603 | print_desc(desc); | |
1604 | } | |
1605 | } | |
1606 | printk(KERN_INFO "md: THIS: "); | |
1607 | print_desc(&sb->this_disk); | |
cd2ac932 | 1608 | } |
1da177e4 | 1609 | |
cd2ac932 CR |
1610 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1611 | { | |
1612 | __u8 *uuid; | |
1613 | ||
1614 | uuid = sb->set_uuid; | |
1615 | printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1616 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1617 | KERN_INFO "md: Name: \"%s\" CT:%llu\n", | |
1618 | le32_to_cpu(sb->major_version), | |
1619 | le32_to_cpu(sb->feature_map), | |
1620 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1621 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1622 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1623 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1624 | sb->set_name, | |
1625 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1626 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1627 | ||
1628 | uuid = sb->device_uuid; | |
1629 | printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
1630 | " RO:%llu\n" | |
1631 | KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" | |
1632 | ":%02x%02x%02x%02x%02x%02x\n" | |
1633 | KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1634 | KERN_INFO "md: (MaxDev:%u) \n", | |
1635 | le32_to_cpu(sb->level), | |
1636 | (unsigned long long)le64_to_cpu(sb->size), | |
1637 | le32_to_cpu(sb->raid_disks), | |
1638 | le32_to_cpu(sb->layout), | |
1639 | le32_to_cpu(sb->chunksize), | |
1640 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1641 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1642 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1643 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1644 | le32_to_cpu(sb->dev_number), | |
1645 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1646 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1647 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1648 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1649 | sb->devflags, | |
1650 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1651 | (unsigned long long)le64_to_cpu(sb->events), | |
1652 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1653 | le32_to_cpu(sb->sb_csum), | |
1654 | le32_to_cpu(sb->max_dev) | |
1655 | ); | |
1da177e4 LT |
1656 | } |
1657 | ||
cd2ac932 | 1658 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1659 | { |
1660 | char b[BDEVNAME_SIZE]; | |
1661 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1662 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1663 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1664 | rdev->desc_nr); | |
1da177e4 | 1665 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1666 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1667 | switch (major_version) { | |
1668 | case 0: | |
1669 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1670 | break; | |
1671 | case 1: | |
1672 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1673 | break; | |
1674 | } | |
1da177e4 LT |
1675 | } else |
1676 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1677 | } | |
1678 | ||
5e56341d | 1679 | static void md_print_devices(void) |
1da177e4 | 1680 | { |
159ec1fc | 1681 | struct list_head *tmp; |
1da177e4 LT |
1682 | mdk_rdev_t *rdev; |
1683 | mddev_t *mddev; | |
1684 | char b[BDEVNAME_SIZE]; | |
1685 | ||
1686 | printk("\n"); | |
1687 | printk("md: **********************************\n"); | |
1688 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1689 | printk("md: **********************************\n"); | |
29ac4aa3 | 1690 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1691 | |
32a7627c N |
1692 | if (mddev->bitmap) |
1693 | bitmap_print_sb(mddev->bitmap); | |
1694 | else | |
1695 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 1696 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
1697 | printk("<%s>", bdevname(rdev->bdev,b)); |
1698 | printk("\n"); | |
1699 | ||
159ec1fc | 1700 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 1701 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
1702 | } |
1703 | printk("md: **********************************\n"); | |
1704 | printk("\n"); | |
1705 | } | |
1706 | ||
1707 | ||
42543769 | 1708 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1709 | { |
42543769 N |
1710 | /* Update each superblock (in-memory image), but |
1711 | * if we are allowed to, skip spares which already | |
1712 | * have the right event counter, or have one earlier | |
1713 | * (which would mean they aren't being marked as dirty | |
1714 | * with the rest of the array) | |
1715 | */ | |
1da177e4 | 1716 | mdk_rdev_t *rdev; |
1da177e4 | 1717 | |
159ec1fc | 1718 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
1719 | if (rdev->sb_events == mddev->events || |
1720 | (nospares && | |
1721 | rdev->raid_disk < 0 && | |
1722 | (rdev->sb_events&1)==0 && | |
1723 | rdev->sb_events+1 == mddev->events)) { | |
1724 | /* Don't update this superblock */ | |
1725 | rdev->sb_loaded = 2; | |
1726 | } else { | |
1727 | super_types[mddev->major_version]. | |
1728 | sync_super(mddev, rdev); | |
1729 | rdev->sb_loaded = 1; | |
1730 | } | |
1da177e4 LT |
1731 | } |
1732 | } | |
1733 | ||
850b2b42 | 1734 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1735 | { |
1da177e4 | 1736 | mdk_rdev_t *rdev; |
06d91a5f | 1737 | int sync_req; |
42543769 | 1738 | int nospares = 0; |
1da177e4 | 1739 | |
8377bc80 N |
1740 | if (mddev->external) |
1741 | return; | |
1da177e4 | 1742 | repeat: |
a9701a30 | 1743 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1744 | |
850b2b42 N |
1745 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1746 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1747 | force_change = 1; | |
1748 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1749 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1750 | * though if events isn't the right even/odd, we will have to do | |
1751 | * spares after all | |
1752 | */ | |
1753 | nospares = 1; | |
1754 | if (force_change) | |
1755 | nospares = 0; | |
1756 | if (mddev->degraded) | |
84692195 N |
1757 | /* If the array is degraded, then skipping spares is both |
1758 | * dangerous and fairly pointless. | |
1759 | * Dangerous because a device that was removed from the array | |
1760 | * might have a event_count that still looks up-to-date, | |
1761 | * so it can be re-added without a resync. | |
1762 | * Pointless because if there are any spares to skip, | |
1763 | * then a recovery will happen and soon that array won't | |
1764 | * be degraded any more and the spare can go back to sleep then. | |
1765 | */ | |
850b2b42 | 1766 | nospares = 0; |
84692195 | 1767 | |
06d91a5f | 1768 | sync_req = mddev->in_sync; |
1da177e4 | 1769 | mddev->utime = get_seconds(); |
42543769 N |
1770 | |
1771 | /* If this is just a dirty<->clean transition, and the array is clean | |
1772 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1773 | if (nospares |
42543769 | 1774 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1775 | && (mddev->events & 1) |
1776 | && mddev->events != 1) | |
42543769 N |
1777 | mddev->events--; |
1778 | else { | |
1779 | /* otherwise we have to go forward and ... */ | |
1780 | mddev->events ++; | |
1781 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1782 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1783 | if ((mddev->events&1)==0) { | |
1784 | mddev->events++; | |
1785 | nospares = 0; | |
1786 | } | |
1787 | } else { | |
1788 | /* otherwise insist on an even 'events' (for clean states) */ | |
1789 | if ((mddev->events&1)) { | |
1790 | mddev->events++; | |
1791 | nospares = 0; | |
1792 | } | |
1793 | } | |
1794 | } | |
1da177e4 LT |
1795 | |
1796 | if (!mddev->events) { | |
1797 | /* | |
1798 | * oops, this 64-bit counter should never wrap. | |
1799 | * Either we are in around ~1 trillion A.C., assuming | |
1800 | * 1 reboot per second, or we have a bug: | |
1801 | */ | |
1802 | MD_BUG(); | |
1803 | mddev->events --; | |
1804 | } | |
1da177e4 LT |
1805 | |
1806 | /* | |
1807 | * do not write anything to disk if using | |
1808 | * nonpersistent superblocks | |
1809 | */ | |
06d91a5f | 1810 | if (!mddev->persistent) { |
e691063a N |
1811 | if (!mddev->external) |
1812 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1813 | ||
a9701a30 | 1814 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1815 | wake_up(&mddev->sb_wait); |
1da177e4 | 1816 | return; |
06d91a5f | 1817 | } |
e691063a | 1818 | sync_sbs(mddev, nospares); |
a9701a30 | 1819 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1820 | |
1821 | dprintk(KERN_INFO | |
1822 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1823 | mdname(mddev),mddev->in_sync); | |
1824 | ||
4ad13663 | 1825 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 1826 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
1827 | char b[BDEVNAME_SIZE]; |
1828 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1829 | if (rdev->sb_loaded != 1) |
1830 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1831 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1832 | dprintk("(skipping faulty "); |
1833 | ||
1834 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1835 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1836 | md_super_write(mddev,rdev, |
0f420358 | 1837 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
1838 | rdev->sb_page); |
1839 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1840 | bdevname(rdev->bdev,b), | |
0f420358 | 1841 | (unsigned long long)rdev->sb_start); |
42543769 | 1842 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1843 | |
1da177e4 LT |
1844 | } else |
1845 | dprintk(")\n"); | |
7bfa19f2 | 1846 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1847 | /* only need to write one superblock... */ |
1848 | break; | |
1849 | } | |
a9701a30 | 1850 | md_super_wait(mddev); |
850b2b42 | 1851 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1852 | |
a9701a30 | 1853 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1854 | if (mddev->in_sync != sync_req || |
1855 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1856 | /* have to write it out again */ |
a9701a30 | 1857 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1858 | goto repeat; |
1859 | } | |
850b2b42 | 1860 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1861 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1862 | wake_up(&mddev->sb_wait); |
06d91a5f | 1863 | |
1da177e4 LT |
1864 | } |
1865 | ||
7f6ce769 | 1866 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
1867 | * We want to accept with case. For this we use cmd_match. |
1868 | */ | |
1869 | static int cmd_match(const char *cmd, const char *str) | |
1870 | { | |
1871 | /* See if cmd, written into a sysfs file, matches | |
1872 | * str. They must either be the same, or cmd can | |
1873 | * have a trailing newline | |
1874 | */ | |
1875 | while (*cmd && *str && *cmd == *str) { | |
1876 | cmd++; | |
1877 | str++; | |
1878 | } | |
1879 | if (*cmd == '\n') | |
1880 | cmd++; | |
1881 | if (*str || *cmd) | |
1882 | return 0; | |
1883 | return 1; | |
1884 | } | |
1885 | ||
86e6ffdd N |
1886 | struct rdev_sysfs_entry { |
1887 | struct attribute attr; | |
1888 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1889 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1890 | }; | |
1891 | ||
1892 | static ssize_t | |
96de1e66 | 1893 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1894 | { |
1895 | char *sep = ""; | |
20a49ff6 | 1896 | size_t len = 0; |
86e6ffdd | 1897 | |
b2d444d7 | 1898 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1899 | len+= sprintf(page+len, "%sfaulty",sep); |
1900 | sep = ","; | |
1901 | } | |
b2d444d7 | 1902 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1903 | len += sprintf(page+len, "%sin_sync",sep); |
1904 | sep = ","; | |
1905 | } | |
f655675b N |
1906 | if (test_bit(WriteMostly, &rdev->flags)) { |
1907 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1908 | sep = ","; | |
1909 | } | |
6bfe0b49 DW |
1910 | if (test_bit(Blocked, &rdev->flags)) { |
1911 | len += sprintf(page+len, "%sblocked", sep); | |
1912 | sep = ","; | |
1913 | } | |
b2d444d7 N |
1914 | if (!test_bit(Faulty, &rdev->flags) && |
1915 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1916 | len += sprintf(page+len, "%sspare", sep); |
1917 | sep = ","; | |
1918 | } | |
1919 | return len+sprintf(page+len, "\n"); | |
1920 | } | |
1921 | ||
45dc2de1 N |
1922 | static ssize_t |
1923 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1924 | { | |
1925 | /* can write | |
1926 | * faulty - simulates and error | |
1927 | * remove - disconnects the device | |
f655675b N |
1928 | * writemostly - sets write_mostly |
1929 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
1930 | * blocked - sets the Blocked flag |
1931 | * -blocked - clears the Blocked flag | |
45dc2de1 N |
1932 | */ |
1933 | int err = -EINVAL; | |
1934 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1935 | md_error(rdev->mddev, rdev); | |
1936 | err = 0; | |
1937 | } else if (cmd_match(buf, "remove")) { | |
1938 | if (rdev->raid_disk >= 0) | |
1939 | err = -EBUSY; | |
1940 | else { | |
1941 | mddev_t *mddev = rdev->mddev; | |
1942 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1943 | if (mddev->pers) |
1944 | md_update_sb(mddev, 1); | |
45dc2de1 N |
1945 | md_new_event(mddev); |
1946 | err = 0; | |
1947 | } | |
f655675b N |
1948 | } else if (cmd_match(buf, "writemostly")) { |
1949 | set_bit(WriteMostly, &rdev->flags); | |
1950 | err = 0; | |
1951 | } else if (cmd_match(buf, "-writemostly")) { | |
1952 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
1953 | err = 0; |
1954 | } else if (cmd_match(buf, "blocked")) { | |
1955 | set_bit(Blocked, &rdev->flags); | |
1956 | err = 0; | |
1957 | } else if (cmd_match(buf, "-blocked")) { | |
1958 | clear_bit(Blocked, &rdev->flags); | |
1959 | wake_up(&rdev->blocked_wait); | |
1960 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
1961 | md_wakeup_thread(rdev->mddev->thread); | |
1962 | ||
f655675b | 1963 | err = 0; |
45dc2de1 | 1964 | } |
3c0ee63a N |
1965 | if (!err && rdev->sysfs_state) |
1966 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
1967 | return err ? err : len; |
1968 | } | |
80ca3a44 N |
1969 | static struct rdev_sysfs_entry rdev_state = |
1970 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 1971 | |
4dbcdc75 N |
1972 | static ssize_t |
1973 | errors_show(mdk_rdev_t *rdev, char *page) | |
1974 | { | |
1975 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1976 | } | |
1977 | ||
1978 | static ssize_t | |
1979 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1980 | { | |
1981 | char *e; | |
1982 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1983 | if (*buf && (*e == 0 || *e == '\n')) { | |
1984 | atomic_set(&rdev->corrected_errors, n); | |
1985 | return len; | |
1986 | } | |
1987 | return -EINVAL; | |
1988 | } | |
1989 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 1990 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 1991 | |
014236d2 N |
1992 | static ssize_t |
1993 | slot_show(mdk_rdev_t *rdev, char *page) | |
1994 | { | |
1995 | if (rdev->raid_disk < 0) | |
1996 | return sprintf(page, "none\n"); | |
1997 | else | |
1998 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1999 | } | |
2000 | ||
2001 | static ssize_t | |
2002 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2003 | { | |
2004 | char *e; | |
c303da6d N |
2005 | int err; |
2006 | char nm[20]; | |
014236d2 N |
2007 | int slot = simple_strtoul(buf, &e, 10); |
2008 | if (strncmp(buf, "none", 4)==0) | |
2009 | slot = -1; | |
2010 | else if (e==buf || (*e && *e!= '\n')) | |
2011 | return -EINVAL; | |
6c2fce2e | 2012 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2013 | /* Setting 'slot' on an active array requires also |
2014 | * updating the 'rd%d' link, and communicating | |
2015 | * with the personality with ->hot_*_disk. | |
2016 | * For now we only support removing | |
2017 | * failed/spare devices. This normally happens automatically, | |
2018 | * but not when the metadata is externally managed. | |
2019 | */ | |
c303da6d N |
2020 | if (rdev->raid_disk == -1) |
2021 | return -EEXIST; | |
2022 | /* personality does all needed checks */ | |
2023 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2024 | return -EINVAL; | |
2025 | err = rdev->mddev->pers-> | |
2026 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2027 | if (err) | |
2028 | return err; | |
2029 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2030 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2031 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2032 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2033 | } else if (rdev->mddev->pers) { |
2034 | mdk_rdev_t *rdev2; | |
6c2fce2e NB |
2035 | /* Activating a spare .. or possibly reactivating |
2036 | * if we every get bitmaps working here. | |
2037 | */ | |
2038 | ||
2039 | if (rdev->raid_disk != -1) | |
2040 | return -EBUSY; | |
2041 | ||
2042 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2043 | return -EINVAL; | |
2044 | ||
159ec1fc | 2045 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2046 | if (rdev2->raid_disk == slot) |
2047 | return -EEXIST; | |
2048 | ||
2049 | rdev->raid_disk = slot; | |
2050 | if (test_bit(In_sync, &rdev->flags)) | |
2051 | rdev->saved_raid_disk = slot; | |
2052 | else | |
2053 | rdev->saved_raid_disk = -1; | |
2054 | err = rdev->mddev->pers-> | |
2055 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2056 | if (err) { |
6c2fce2e | 2057 | rdev->raid_disk = -1; |
6c2fce2e | 2058 | return err; |
52664732 | 2059 | } else |
3c0ee63a | 2060 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2061 | sprintf(nm, "rd%d", rdev->raid_disk); |
2062 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2063 | printk(KERN_WARNING | |
2064 | "md: cannot register " | |
2065 | "%s for %s\n", | |
2066 | nm, mdname(rdev->mddev)); | |
2067 | ||
2068 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2069 | } else { |
2070 | if (slot >= rdev->mddev->raid_disks) | |
2071 | return -ENOSPC; | |
2072 | rdev->raid_disk = slot; | |
2073 | /* assume it is working */ | |
c5d79adb N |
2074 | clear_bit(Faulty, &rdev->flags); |
2075 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2076 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2077 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2078 | } |
014236d2 N |
2079 | return len; |
2080 | } | |
2081 | ||
2082 | ||
2083 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2084 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2085 | |
93c8cad0 N |
2086 | static ssize_t |
2087 | offset_show(mdk_rdev_t *rdev, char *page) | |
2088 | { | |
6961ece4 | 2089 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2090 | } |
2091 | ||
2092 | static ssize_t | |
2093 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2094 | { | |
2095 | char *e; | |
2096 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2097 | if (e==buf || (*e && *e != '\n')) | |
2098 | return -EINVAL; | |
8ed0a521 | 2099 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2100 | return -EBUSY; |
c5d79adb N |
2101 | if (rdev->size && rdev->mddev->external) |
2102 | /* Must set offset before size, so overlap checks | |
2103 | * can be sane */ | |
2104 | return -EBUSY; | |
93c8cad0 N |
2105 | rdev->data_offset = offset; |
2106 | return len; | |
2107 | } | |
2108 | ||
2109 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2110 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2111 | |
83303b61 N |
2112 | static ssize_t |
2113 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2114 | { | |
2115 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
2116 | } | |
2117 | ||
c5d79adb N |
2118 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2119 | { | |
2120 | /* check if two start/length pairs overlap */ | |
2121 | if (s1+l1 <= s2) | |
2122 | return 0; | |
2123 | if (s2+l2 <= s1) | |
2124 | return 0; | |
2125 | return 1; | |
2126 | } | |
2127 | ||
83303b61 N |
2128 | static ssize_t |
2129 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2130 | { | |
d7027458 | 2131 | unsigned long long size; |
c5d79adb | 2132 | unsigned long long oldsize = rdev->size; |
27c529bb N |
2133 | mddev_t *my_mddev = rdev->mddev; |
2134 | ||
d7027458 NB |
2135 | if (strict_strtoull(buf, 10, &size) < 0) |
2136 | return -EINVAL; | |
0cd17fec | 2137 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 NB |
2138 | if (my_mddev->persistent) { |
2139 | size = super_types[my_mddev->major_version]. | |
15f4a5fd | 2140 | rdev_size_change(rdev, size * 2); |
0cd17fec CW |
2141 | if (!size) |
2142 | return -EBUSY; | |
2143 | } else if (!size) { | |
2144 | size = (rdev->bdev->bd_inode->i_size >> 10); | |
2145 | size -= rdev->data_offset/2; | |
2146 | } | |
0cd17fec | 2147 | } |
7d3c6f87 CW |
2148 | if (size < my_mddev->size) |
2149 | return -EINVAL; /* component must fit device */ | |
0cd17fec | 2150 | |
83303b61 | 2151 | rdev->size = size; |
d7027458 | 2152 | if (size > oldsize && my_mddev->external) { |
c5d79adb N |
2153 | /* need to check that all other rdevs with the same ->bdev |
2154 | * do not overlap. We need to unlock the mddev to avoid | |
2155 | * a deadlock. We have already changed rdev->size, and if | |
2156 | * we have to change it back, we will have the lock again. | |
2157 | */ | |
2158 | mddev_t *mddev; | |
2159 | int overlap = 0; | |
159ec1fc | 2160 | struct list_head *tmp; |
c5d79adb | 2161 | |
27c529bb | 2162 | mddev_unlock(my_mddev); |
29ac4aa3 | 2163 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2164 | mdk_rdev_t *rdev2; |
2165 | ||
2166 | mddev_lock(mddev); | |
159ec1fc | 2167 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2168 | if (test_bit(AllReserved, &rdev2->flags) || |
2169 | (rdev->bdev == rdev2->bdev && | |
2170 | rdev != rdev2 && | |
d07bd3bc AN |
2171 | overlaps(rdev->data_offset, rdev->size * 2, |
2172 | rdev2->data_offset, | |
2173 | rdev2->size * 2))) { | |
c5d79adb N |
2174 | overlap = 1; |
2175 | break; | |
2176 | } | |
2177 | mddev_unlock(mddev); | |
2178 | if (overlap) { | |
2179 | mddev_put(mddev); | |
2180 | break; | |
2181 | } | |
2182 | } | |
27c529bb | 2183 | mddev_lock(my_mddev); |
c5d79adb N |
2184 | if (overlap) { |
2185 | /* Someone else could have slipped in a size | |
2186 | * change here, but doing so is just silly. | |
2187 | * We put oldsize back because we *know* it is | |
2188 | * safe, and trust userspace not to race with | |
2189 | * itself | |
2190 | */ | |
2191 | rdev->size = oldsize; | |
2192 | return -EBUSY; | |
2193 | } | |
2194 | } | |
83303b61 N |
2195 | return len; |
2196 | } | |
2197 | ||
2198 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2199 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2200 | |
86e6ffdd N |
2201 | static struct attribute *rdev_default_attrs[] = { |
2202 | &rdev_state.attr, | |
4dbcdc75 | 2203 | &rdev_errors.attr, |
014236d2 | 2204 | &rdev_slot.attr, |
93c8cad0 | 2205 | &rdev_offset.attr, |
83303b61 | 2206 | &rdev_size.attr, |
86e6ffdd N |
2207 | NULL, |
2208 | }; | |
2209 | static ssize_t | |
2210 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2211 | { | |
2212 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2213 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2214 | mddev_t *mddev = rdev->mddev; |
2215 | ssize_t rv; | |
86e6ffdd N |
2216 | |
2217 | if (!entry->show) | |
2218 | return -EIO; | |
27c529bb N |
2219 | |
2220 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2221 | if (!rv) { | |
2222 | if (rdev->mddev == NULL) | |
2223 | rv = -EBUSY; | |
2224 | else | |
2225 | rv = entry->show(rdev, page); | |
2226 | mddev_unlock(mddev); | |
2227 | } | |
2228 | return rv; | |
86e6ffdd N |
2229 | } |
2230 | ||
2231 | static ssize_t | |
2232 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2233 | const char *page, size_t length) | |
2234 | { | |
2235 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2236 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2237 | ssize_t rv; |
2238 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2239 | |
2240 | if (!entry->store) | |
2241 | return -EIO; | |
67463acb N |
2242 | if (!capable(CAP_SYS_ADMIN)) |
2243 | return -EACCES; | |
27c529bb | 2244 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2245 | if (!rv) { |
27c529bb N |
2246 | if (rdev->mddev == NULL) |
2247 | rv = -EBUSY; | |
2248 | else | |
2249 | rv = entry->store(rdev, page, length); | |
6a51830e | 2250 | mddev_unlock(mddev); |
ca388059 N |
2251 | } |
2252 | return rv; | |
86e6ffdd N |
2253 | } |
2254 | ||
2255 | static void rdev_free(struct kobject *ko) | |
2256 | { | |
2257 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2258 | kfree(rdev); | |
2259 | } | |
2260 | static struct sysfs_ops rdev_sysfs_ops = { | |
2261 | .show = rdev_attr_show, | |
2262 | .store = rdev_attr_store, | |
2263 | }; | |
2264 | static struct kobj_type rdev_ktype = { | |
2265 | .release = rdev_free, | |
2266 | .sysfs_ops = &rdev_sysfs_ops, | |
2267 | .default_attrs = rdev_default_attrs, | |
2268 | }; | |
2269 | ||
1da177e4 LT |
2270 | /* |
2271 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2272 | * | |
2273 | * mark the device faulty if: | |
2274 | * | |
2275 | * - the device is nonexistent (zero size) | |
2276 | * - the device has no valid superblock | |
2277 | * | |
2278 | * a faulty rdev _never_ has rdev->sb set. | |
2279 | */ | |
2280 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2281 | { | |
2282 | char b[BDEVNAME_SIZE]; | |
2283 | int err; | |
2284 | mdk_rdev_t *rdev; | |
2285 | sector_t size; | |
2286 | ||
9ffae0cf | 2287 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2288 | if (!rdev) { |
2289 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2290 | return ERR_PTR(-ENOMEM); | |
2291 | } | |
1da177e4 LT |
2292 | |
2293 | if ((err = alloc_disk_sb(rdev))) | |
2294 | goto abort_free; | |
2295 | ||
c5d79adb | 2296 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2297 | if (err) |
2298 | goto abort_free; | |
2299 | ||
f9cb074b | 2300 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2301 | |
1da177e4 | 2302 | rdev->desc_nr = -1; |
2b6e8459 | 2303 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2304 | rdev->raid_disk = -1; |
b2d444d7 | 2305 | rdev->flags = 0; |
1da177e4 | 2306 | rdev->data_offset = 0; |
42543769 | 2307 | rdev->sb_events = 0; |
1da177e4 | 2308 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2309 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2310 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2311 | |
2312 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2313 | if (!size) { | |
2314 | printk(KERN_WARNING | |
2315 | "md: %s has zero or unknown size, marking faulty!\n", | |
2316 | bdevname(rdev->bdev,b)); | |
2317 | err = -EINVAL; | |
2318 | goto abort_free; | |
2319 | } | |
2320 | ||
2321 | if (super_format >= 0) { | |
2322 | err = super_types[super_format]. | |
2323 | load_super(rdev, NULL, super_minor); | |
2324 | if (err == -EINVAL) { | |
df968c4e N |
2325 | printk(KERN_WARNING |
2326 | "md: %s does not have a valid v%d.%d " | |
2327 | "superblock, not importing!\n", | |
2328 | bdevname(rdev->bdev,b), | |
2329 | super_format, super_minor); | |
1da177e4 LT |
2330 | goto abort_free; |
2331 | } | |
2332 | if (err < 0) { | |
2333 | printk(KERN_WARNING | |
2334 | "md: could not read %s's sb, not importing!\n", | |
2335 | bdevname(rdev->bdev,b)); | |
2336 | goto abort_free; | |
2337 | } | |
2338 | } | |
6bfe0b49 | 2339 | |
1da177e4 | 2340 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2341 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2342 | |
2343 | return rdev; | |
2344 | ||
2345 | abort_free: | |
2346 | if (rdev->sb_page) { | |
2347 | if (rdev->bdev) | |
2348 | unlock_rdev(rdev); | |
2349 | free_disk_sb(rdev); | |
2350 | } | |
2351 | kfree(rdev); | |
2352 | return ERR_PTR(err); | |
2353 | } | |
2354 | ||
2355 | /* | |
2356 | * Check a full RAID array for plausibility | |
2357 | */ | |
2358 | ||
2359 | ||
a757e64c | 2360 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2361 | { |
2362 | int i; | |
159ec1fc | 2363 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2364 | char b[BDEVNAME_SIZE]; |
2365 | ||
2366 | freshest = NULL; | |
d089c6af | 2367 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2368 | switch (super_types[mddev->major_version]. |
2369 | load_super(rdev, freshest, mddev->minor_version)) { | |
2370 | case 1: | |
2371 | freshest = rdev; | |
2372 | break; | |
2373 | case 0: | |
2374 | break; | |
2375 | default: | |
2376 | printk( KERN_ERR \ | |
2377 | "md: fatal superblock inconsistency in %s" | |
2378 | " -- removing from array\n", | |
2379 | bdevname(rdev->bdev,b)); | |
2380 | kick_rdev_from_array(rdev); | |
2381 | } | |
2382 | ||
2383 | ||
2384 | super_types[mddev->major_version]. | |
2385 | validate_super(mddev, freshest); | |
2386 | ||
2387 | i = 0; | |
d089c6af | 2388 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2389 | if (rdev != freshest) |
2390 | if (super_types[mddev->major_version]. | |
2391 | validate_super(mddev, rdev)) { | |
2392 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2393 | " from array!\n", | |
2394 | bdevname(rdev->bdev,b)); | |
2395 | kick_rdev_from_array(rdev); | |
2396 | continue; | |
2397 | } | |
2398 | if (mddev->level == LEVEL_MULTIPATH) { | |
2399 | rdev->desc_nr = i++; | |
2400 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2401 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2402 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2403 | rdev->raid_disk = -1; | |
2404 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2405 | } |
2406 | } | |
2407 | ||
2408 | ||
2409 | ||
2410 | if (mddev->recovery_cp != MaxSector && | |
2411 | mddev->level >= 1) | |
2412 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2413 | " -- starting background reconstruction\n", | |
2414 | mdname(mddev)); | |
2415 | ||
1da177e4 LT |
2416 | } |
2417 | ||
19052c0e N |
2418 | static void md_safemode_timeout(unsigned long data); |
2419 | ||
16f17b39 N |
2420 | static ssize_t |
2421 | safe_delay_show(mddev_t *mddev, char *page) | |
2422 | { | |
2423 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2424 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2425 | } | |
2426 | static ssize_t | |
2427 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2428 | { | |
2429 | int scale=1; | |
2430 | int dot=0; | |
2431 | int i; | |
2432 | unsigned long msec; | |
2433 | char buf[30]; | |
97ce0a7f | 2434 | |
16f17b39 N |
2435 | /* remove a period, and count digits after it */ |
2436 | if (len >= sizeof(buf)) | |
2437 | return -EINVAL; | |
97ce0a7f | 2438 | strlcpy(buf, cbuf, sizeof(buf)); |
16f17b39 N |
2439 | for (i=0; i<len; i++) { |
2440 | if (dot) { | |
2441 | if (isdigit(buf[i])) { | |
2442 | buf[i-1] = buf[i]; | |
2443 | scale *= 10; | |
2444 | } | |
2445 | buf[i] = 0; | |
2446 | } else if (buf[i] == '.') { | |
2447 | dot=1; | |
2448 | buf[i] = 0; | |
2449 | } | |
2450 | } | |
97ce0a7f | 2451 | if (strict_strtoul(buf, 10, &msec) < 0) |
16f17b39 N |
2452 | return -EINVAL; |
2453 | msec = (msec * 1000) / scale; | |
2454 | if (msec == 0) | |
2455 | mddev->safemode_delay = 0; | |
2456 | else { | |
19052c0e | 2457 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2458 | mddev->safemode_delay = (msec*HZ)/1000; |
2459 | if (mddev->safemode_delay == 0) | |
2460 | mddev->safemode_delay = 1; | |
19052c0e N |
2461 | if (mddev->safemode_delay < old_delay) |
2462 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2463 | } |
2464 | return len; | |
2465 | } | |
2466 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2467 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2468 | |
eae1701f | 2469 | static ssize_t |
96de1e66 | 2470 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2471 | { |
2604b703 | 2472 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2473 | if (p) |
eae1701f | 2474 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2475 | else if (mddev->clevel[0]) |
2476 | return sprintf(page, "%s\n", mddev->clevel); | |
2477 | else if (mddev->level != LEVEL_NONE) | |
2478 | return sprintf(page, "%d\n", mddev->level); | |
2479 | else | |
2480 | return 0; | |
eae1701f N |
2481 | } |
2482 | ||
d9d166c2 N |
2483 | static ssize_t |
2484 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2485 | { | |
20a49ff6 | 2486 | ssize_t rv = len; |
d9d166c2 N |
2487 | if (mddev->pers) |
2488 | return -EBUSY; | |
2489 | if (len == 0) | |
2490 | return 0; | |
2491 | if (len >= sizeof(mddev->clevel)) | |
2492 | return -ENOSPC; | |
2493 | strncpy(mddev->clevel, buf, len); | |
2494 | if (mddev->clevel[len-1] == '\n') | |
2495 | len--; | |
2496 | mddev->clevel[len] = 0; | |
2497 | mddev->level = LEVEL_NONE; | |
2498 | return rv; | |
2499 | } | |
2500 | ||
2501 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2502 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2503 | |
d4dbd025 N |
2504 | |
2505 | static ssize_t | |
2506 | layout_show(mddev_t *mddev, char *page) | |
2507 | { | |
2508 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2509 | if (mddev->reshape_position != MaxSector && |
2510 | mddev->layout != mddev->new_layout) | |
2511 | return sprintf(page, "%d (%d)\n", | |
2512 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2513 | return sprintf(page, "%d\n", mddev->layout); |
2514 | } | |
2515 | ||
2516 | static ssize_t | |
2517 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2518 | { | |
2519 | char *e; | |
2520 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2521 | |
2522 | if (!*buf || (*e && *e != '\n')) | |
2523 | return -EINVAL; | |
2524 | ||
08a02ecd N |
2525 | if (mddev->pers) |
2526 | return -EBUSY; | |
2527 | if (mddev->reshape_position != MaxSector) | |
2528 | mddev->new_layout = n; | |
2529 | else | |
2530 | mddev->layout = n; | |
d4dbd025 N |
2531 | return len; |
2532 | } | |
2533 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2534 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2535 | |
2536 | ||
eae1701f | 2537 | static ssize_t |
96de1e66 | 2538 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2539 | { |
bb636547 N |
2540 | if (mddev->raid_disks == 0) |
2541 | return 0; | |
08a02ecd N |
2542 | if (mddev->reshape_position != MaxSector && |
2543 | mddev->delta_disks != 0) | |
2544 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2545 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2546 | return sprintf(page, "%d\n", mddev->raid_disks); |
2547 | } | |
2548 | ||
da943b99 N |
2549 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2550 | ||
2551 | static ssize_t | |
2552 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2553 | { | |
da943b99 N |
2554 | char *e; |
2555 | int rv = 0; | |
2556 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2557 | ||
2558 | if (!*buf || (*e && *e != '\n')) | |
2559 | return -EINVAL; | |
2560 | ||
2561 | if (mddev->pers) | |
2562 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2563 | else if (mddev->reshape_position != MaxSector) { |
2564 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2565 | mddev->delta_disks = n - olddisks; | |
2566 | mddev->raid_disks = n; | |
2567 | } else | |
da943b99 N |
2568 | mddev->raid_disks = n; |
2569 | return rv ? rv : len; | |
2570 | } | |
2571 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2572 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2573 | |
3b34380a N |
2574 | static ssize_t |
2575 | chunk_size_show(mddev_t *mddev, char *page) | |
2576 | { | |
08a02ecd N |
2577 | if (mddev->reshape_position != MaxSector && |
2578 | mddev->chunk_size != mddev->new_chunk) | |
2579 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2580 | mddev->chunk_size); | |
3b34380a N |
2581 | return sprintf(page, "%d\n", mddev->chunk_size); |
2582 | } | |
2583 | ||
2584 | static ssize_t | |
2585 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2586 | { | |
2587 | /* can only set chunk_size if array is not yet active */ | |
2588 | char *e; | |
2589 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2590 | ||
3b34380a N |
2591 | if (!*buf || (*e && *e != '\n')) |
2592 | return -EINVAL; | |
2593 | ||
08a02ecd N |
2594 | if (mddev->pers) |
2595 | return -EBUSY; | |
2596 | else if (mddev->reshape_position != MaxSector) | |
2597 | mddev->new_chunk = n; | |
2598 | else | |
2599 | mddev->chunk_size = n; | |
3b34380a N |
2600 | return len; |
2601 | } | |
2602 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2603 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2604 | |
a94213b1 N |
2605 | static ssize_t |
2606 | resync_start_show(mddev_t *mddev, char *page) | |
2607 | { | |
2608 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2609 | } | |
2610 | ||
2611 | static ssize_t | |
2612 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2613 | { | |
a94213b1 N |
2614 | char *e; |
2615 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2616 | ||
2617 | if (mddev->pers) | |
2618 | return -EBUSY; | |
2619 | if (!*buf || (*e && *e != '\n')) | |
2620 | return -EINVAL; | |
2621 | ||
2622 | mddev->recovery_cp = n; | |
2623 | return len; | |
2624 | } | |
2625 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2626 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2627 | |
9e653b63 N |
2628 | /* |
2629 | * The array state can be: | |
2630 | * | |
2631 | * clear | |
2632 | * No devices, no size, no level | |
2633 | * Equivalent to STOP_ARRAY ioctl | |
2634 | * inactive | |
2635 | * May have some settings, but array is not active | |
2636 | * all IO results in error | |
2637 | * When written, doesn't tear down array, but just stops it | |
2638 | * suspended (not supported yet) | |
2639 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2640 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2641 | * readonly |
2642 | * no resync can happen. no superblocks get written. | |
2643 | * write requests fail | |
2644 | * read-auto | |
2645 | * like readonly, but behaves like 'clean' on a write request. | |
2646 | * | |
2647 | * clean - no pending writes, but otherwise active. | |
2648 | * When written to inactive array, starts without resync | |
2649 | * If a write request arrives then | |
2650 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2651 | * if not known, block and switch to write-pending | |
2652 | * If written to an active array that has pending writes, then fails. | |
2653 | * active | |
2654 | * fully active: IO and resync can be happening. | |
2655 | * When written to inactive array, starts with resync | |
2656 | * | |
2657 | * write-pending | |
2658 | * clean, but writes are blocked waiting for 'active' to be written. | |
2659 | * | |
2660 | * active-idle | |
2661 | * like active, but no writes have been seen for a while (100msec). | |
2662 | * | |
2663 | */ | |
2664 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2665 | write_pending, active_idle, bad_word}; | |
05381954 | 2666 | static char *array_states[] = { |
9e653b63 N |
2667 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2668 | "write-pending", "active-idle", NULL }; | |
2669 | ||
2670 | static int match_word(const char *word, char **list) | |
2671 | { | |
2672 | int n; | |
2673 | for (n=0; list[n]; n++) | |
2674 | if (cmd_match(word, list[n])) | |
2675 | break; | |
2676 | return n; | |
2677 | } | |
2678 | ||
2679 | static ssize_t | |
2680 | array_state_show(mddev_t *mddev, char *page) | |
2681 | { | |
2682 | enum array_state st = inactive; | |
2683 | ||
2684 | if (mddev->pers) | |
2685 | switch(mddev->ro) { | |
2686 | case 1: | |
2687 | st = readonly; | |
2688 | break; | |
2689 | case 2: | |
2690 | st = read_auto; | |
2691 | break; | |
2692 | case 0: | |
2693 | if (mddev->in_sync) | |
2694 | st = clean; | |
e691063a N |
2695 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2696 | st = write_pending; | |
9e653b63 N |
2697 | else if (mddev->safemode) |
2698 | st = active_idle; | |
2699 | else | |
2700 | st = active; | |
2701 | } | |
2702 | else { | |
2703 | if (list_empty(&mddev->disks) && | |
2704 | mddev->raid_disks == 0 && | |
2705 | mddev->size == 0) | |
2706 | st = clear; | |
2707 | else | |
2708 | st = inactive; | |
2709 | } | |
2710 | return sprintf(page, "%s\n", array_states[st]); | |
2711 | } | |
2712 | ||
df5b20cf | 2713 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
2714 | static int do_md_run(mddev_t * mddev); |
2715 | static int restart_array(mddev_t *mddev); | |
2716 | ||
2717 | static ssize_t | |
2718 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2719 | { | |
2720 | int err = -EINVAL; | |
2721 | enum array_state st = match_word(buf, array_states); | |
2722 | switch(st) { | |
2723 | case bad_word: | |
2724 | break; | |
2725 | case clear: | |
2726 | /* stopping an active array */ | |
f2ea68cf | 2727 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 2728 | return -EBUSY; |
df5b20cf | 2729 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
2730 | break; |
2731 | case inactive: | |
2732 | /* stopping an active array */ | |
2733 | if (mddev->pers) { | |
f2ea68cf | 2734 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 2735 | return -EBUSY; |
df5b20cf | 2736 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
2737 | } else |
2738 | err = 0; /* already inactive */ | |
9e653b63 N |
2739 | break; |
2740 | case suspended: | |
2741 | break; /* not supported yet */ | |
2742 | case readonly: | |
2743 | if (mddev->pers) | |
df5b20cf | 2744 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
2745 | else { |
2746 | mddev->ro = 1; | |
648b629e | 2747 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
2748 | err = do_md_run(mddev); |
2749 | } | |
2750 | break; | |
2751 | case read_auto: | |
9e653b63 | 2752 | if (mddev->pers) { |
80268ee9 | 2753 | if (mddev->ro == 0) |
df5b20cf | 2754 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 2755 | else if (mddev->ro == 1) |
648b629e N |
2756 | err = restart_array(mddev); |
2757 | if (err == 0) { | |
2758 | mddev->ro = 2; | |
2759 | set_disk_ro(mddev->gendisk, 0); | |
2760 | } | |
9e653b63 N |
2761 | } else { |
2762 | mddev->ro = 2; | |
2763 | err = do_md_run(mddev); | |
2764 | } | |
2765 | break; | |
2766 | case clean: | |
2767 | if (mddev->pers) { | |
2768 | restart_array(mddev); | |
2769 | spin_lock_irq(&mddev->write_lock); | |
2770 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2771 | if (mddev->in_sync == 0) { |
2772 | mddev->in_sync = 1; | |
31a59e34 N |
2773 | if (mddev->safemode == 1) |
2774 | mddev->safemode = 0; | |
e691063a N |
2775 | if (mddev->persistent) |
2776 | set_bit(MD_CHANGE_CLEAN, | |
2777 | &mddev->flags); | |
2778 | } | |
2779 | err = 0; | |
2780 | } else | |
2781 | err = -EBUSY; | |
9e653b63 N |
2782 | spin_unlock_irq(&mddev->write_lock); |
2783 | } else { | |
2784 | mddev->ro = 0; | |
2785 | mddev->recovery_cp = MaxSector; | |
2786 | err = do_md_run(mddev); | |
2787 | } | |
2788 | break; | |
2789 | case active: | |
2790 | if (mddev->pers) { | |
2791 | restart_array(mddev); | |
e691063a N |
2792 | if (mddev->external) |
2793 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2794 | wake_up(&mddev->sb_wait); |
2795 | err = 0; | |
2796 | } else { | |
2797 | mddev->ro = 0; | |
648b629e | 2798 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
2799 | err = do_md_run(mddev); |
2800 | } | |
2801 | break; | |
2802 | case write_pending: | |
2803 | case active_idle: | |
2804 | /* these cannot be set */ | |
2805 | break; | |
2806 | } | |
2807 | if (err) | |
2808 | return err; | |
0fd62b86 | 2809 | else { |
b62b7590 | 2810 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 2811 | return len; |
0fd62b86 | 2812 | } |
9e653b63 | 2813 | } |
80ca3a44 N |
2814 | static struct md_sysfs_entry md_array_state = |
2815 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2816 | |
6d7ff738 N |
2817 | static ssize_t |
2818 | null_show(mddev_t *mddev, char *page) | |
2819 | { | |
2820 | return -EINVAL; | |
2821 | } | |
2822 | ||
2823 | static ssize_t | |
2824 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2825 | { | |
2826 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2827 | /* The new device is added to the array. | |
2828 | * If the array has a persistent superblock, we read the | |
2829 | * superblock to initialise info and check validity. | |
2830 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2831 | * which mainly checks size. | |
2832 | */ | |
2833 | char *e; | |
2834 | int major = simple_strtoul(buf, &e, 10); | |
2835 | int minor; | |
2836 | dev_t dev; | |
2837 | mdk_rdev_t *rdev; | |
2838 | int err; | |
2839 | ||
2840 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2841 | return -EINVAL; | |
2842 | minor = simple_strtoul(e+1, &e, 10); | |
2843 | if (*e && *e != '\n') | |
2844 | return -EINVAL; | |
2845 | dev = MKDEV(major, minor); | |
2846 | if (major != MAJOR(dev) || | |
2847 | minor != MINOR(dev)) | |
2848 | return -EOVERFLOW; | |
2849 | ||
2850 | ||
2851 | if (mddev->persistent) { | |
2852 | rdev = md_import_device(dev, mddev->major_version, | |
2853 | mddev->minor_version); | |
2854 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2855 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2856 | mdk_rdev_t, same_set); | |
2857 | err = super_types[mddev->major_version] | |
2858 | .load_super(rdev, rdev0, mddev->minor_version); | |
2859 | if (err < 0) | |
2860 | goto out; | |
2861 | } | |
c5d79adb N |
2862 | } else if (mddev->external) |
2863 | rdev = md_import_device(dev, -2, -1); | |
2864 | else | |
6d7ff738 N |
2865 | rdev = md_import_device(dev, -1, -1); |
2866 | ||
2867 | if (IS_ERR(rdev)) | |
2868 | return PTR_ERR(rdev); | |
2869 | err = bind_rdev_to_array(rdev, mddev); | |
2870 | out: | |
2871 | if (err) | |
2872 | export_rdev(rdev); | |
2873 | return err ? err : len; | |
2874 | } | |
2875 | ||
2876 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2877 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2878 | |
9b1d1dac PC |
2879 | static ssize_t |
2880 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2881 | { | |
2882 | char *end; | |
2883 | unsigned long chunk, end_chunk; | |
2884 | ||
2885 | if (!mddev->bitmap) | |
2886 | goto out; | |
2887 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2888 | while (*buf) { | |
2889 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2890 | if (buf == end) break; | |
2891 | if (*end == '-') { /* range */ | |
2892 | buf = end + 1; | |
2893 | end_chunk = simple_strtoul(buf, &end, 0); | |
2894 | if (buf == end) break; | |
2895 | } | |
2896 | if (*end && !isspace(*end)) break; | |
2897 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2898 | buf = end; | |
2899 | while (isspace(*buf)) buf++; | |
2900 | } | |
2901 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2902 | out: | |
2903 | return len; | |
2904 | } | |
2905 | ||
2906 | static struct md_sysfs_entry md_bitmap = | |
2907 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2908 | ||
a35b0d69 N |
2909 | static ssize_t |
2910 | size_show(mddev_t *mddev, char *page) | |
2911 | { | |
2912 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2913 | } | |
2914 | ||
d71f9f88 | 2915 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
2916 | |
2917 | static ssize_t | |
2918 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2919 | { | |
2920 | /* If array is inactive, we can reduce the component size, but | |
2921 | * not increase it (except from 0). | |
2922 | * If array is active, we can try an on-line resize | |
2923 | */ | |
2924 | char *e; | |
2925 | int err = 0; | |
2926 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2927 | if (!*buf || *buf == '\n' || | |
2928 | (*e && *e != '\n')) | |
2929 | return -EINVAL; | |
2930 | ||
2931 | if (mddev->pers) { | |
d71f9f88 | 2932 | err = update_size(mddev, size * 2); |
850b2b42 | 2933 | md_update_sb(mddev, 1); |
a35b0d69 N |
2934 | } else { |
2935 | if (mddev->size == 0 || | |
2936 | mddev->size > size) | |
2937 | mddev->size = size; | |
2938 | else | |
2939 | err = -ENOSPC; | |
2940 | } | |
2941 | return err ? err : len; | |
2942 | } | |
2943 | ||
2944 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 2945 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 2946 | |
8bb93aac N |
2947 | |
2948 | /* Metdata version. | |
e691063a N |
2949 | * This is one of |
2950 | * 'none' for arrays with no metadata (good luck...) | |
2951 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
2952 | * or N.M for internally known formats |
2953 | */ | |
2954 | static ssize_t | |
2955 | metadata_show(mddev_t *mddev, char *page) | |
2956 | { | |
2957 | if (mddev->persistent) | |
2958 | return sprintf(page, "%d.%d\n", | |
2959 | mddev->major_version, mddev->minor_version); | |
e691063a N |
2960 | else if (mddev->external) |
2961 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
2962 | else |
2963 | return sprintf(page, "none\n"); | |
2964 | } | |
2965 | ||
2966 | static ssize_t | |
2967 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2968 | { | |
2969 | int major, minor; | |
2970 | char *e; | |
ea43ddd8 N |
2971 | /* Changing the details of 'external' metadata is |
2972 | * always permitted. Otherwise there must be | |
2973 | * no devices attached to the array. | |
2974 | */ | |
2975 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
2976 | ; | |
2977 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
2978 | return -EBUSY; |
2979 | ||
2980 | if (cmd_match(buf, "none")) { | |
2981 | mddev->persistent = 0; | |
e691063a N |
2982 | mddev->external = 0; |
2983 | mddev->major_version = 0; | |
2984 | mddev->minor_version = 90; | |
2985 | return len; | |
2986 | } | |
2987 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 2988 | size_t namelen = len-9; |
e691063a N |
2989 | if (namelen >= sizeof(mddev->metadata_type)) |
2990 | namelen = sizeof(mddev->metadata_type)-1; | |
2991 | strncpy(mddev->metadata_type, buf+9, namelen); | |
2992 | mddev->metadata_type[namelen] = 0; | |
2993 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
2994 | mddev->metadata_type[--namelen] = 0; | |
2995 | mddev->persistent = 0; | |
2996 | mddev->external = 1; | |
8bb93aac N |
2997 | mddev->major_version = 0; |
2998 | mddev->minor_version = 90; | |
2999 | return len; | |
3000 | } | |
3001 | major = simple_strtoul(buf, &e, 10); | |
3002 | if (e==buf || *e != '.') | |
3003 | return -EINVAL; | |
3004 | buf = e+1; | |
3005 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3006 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3007 | return -EINVAL; |
50511da3 | 3008 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3009 | return -ENOENT; |
3010 | mddev->major_version = major; | |
3011 | mddev->minor_version = minor; | |
3012 | mddev->persistent = 1; | |
e691063a | 3013 | mddev->external = 0; |
8bb93aac N |
3014 | return len; |
3015 | } | |
3016 | ||
3017 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3018 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3019 | |
24dd469d | 3020 | static ssize_t |
7eec314d | 3021 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3022 | { |
7eec314d | 3023 | char *type = "idle"; |
31399d9e | 3024 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 3025 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3026 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3027 | type = "reshape"; | |
3028 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3029 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3030 | type = "resync"; | |
3031 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3032 | type = "check"; | |
3033 | else | |
3034 | type = "repair"; | |
72a23c21 | 3035 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3036 | type = "recover"; |
3037 | } | |
3038 | return sprintf(page, "%s\n", type); | |
3039 | } | |
3040 | ||
3041 | static ssize_t | |
7eec314d | 3042 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3043 | { |
7eec314d N |
3044 | if (!mddev->pers || !mddev->pers->sync_request) |
3045 | return -EINVAL; | |
3046 | ||
bce74dac | 3047 | if (cmd_match(page, "idle")) { |
7eec314d N |
3048 | if (mddev->sync_thread) { |
3049 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3050 | md_unregister_thread(mddev->sync_thread); | |
3051 | mddev->sync_thread = NULL; | |
3052 | mddev->recovery = 0; | |
3053 | } | |
03c902e1 N |
3054 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3055 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3056 | return -EBUSY; |
72a23c21 NB |
3057 | else if (cmd_match(page, "resync")) |
3058 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3059 | else if (cmd_match(page, "recover")) { | |
3060 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3061 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3062 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3063 | int err; |
3064 | if (mddev->pers->start_reshape == NULL) | |
3065 | return -EINVAL; | |
3066 | err = mddev->pers->start_reshape(mddev); | |
3067 | if (err) | |
3068 | return err; | |
a99ac971 | 3069 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3070 | } else { |
bce74dac | 3071 | if (cmd_match(page, "check")) |
7eec314d | 3072 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3073 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3074 | return -EINVAL; |
3075 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3076 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3077 | } |
03c902e1 | 3078 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3079 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3080 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3081 | return len; |
3082 | } | |
3083 | ||
9d88883e | 3084 | static ssize_t |
96de1e66 | 3085 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3086 | { |
3087 | return sprintf(page, "%llu\n", | |
3088 | (unsigned long long) mddev->resync_mismatches); | |
3089 | } | |
3090 | ||
80ca3a44 N |
3091 | static struct md_sysfs_entry md_scan_mode = |
3092 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3093 | |
96de1e66 | 3094 | |
80ca3a44 | 3095 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3096 | |
88202a0c N |
3097 | static ssize_t |
3098 | sync_min_show(mddev_t *mddev, char *page) | |
3099 | { | |
3100 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3101 | mddev->sync_speed_min ? "local": "system"); | |
3102 | } | |
3103 | ||
3104 | static ssize_t | |
3105 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3106 | { | |
3107 | int min; | |
3108 | char *e; | |
3109 | if (strncmp(buf, "system", 6)==0) { | |
3110 | mddev->sync_speed_min = 0; | |
3111 | return len; | |
3112 | } | |
3113 | min = simple_strtoul(buf, &e, 10); | |
3114 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3115 | return -EINVAL; | |
3116 | mddev->sync_speed_min = min; | |
3117 | return len; | |
3118 | } | |
3119 | ||
3120 | static struct md_sysfs_entry md_sync_min = | |
3121 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3122 | ||
3123 | static ssize_t | |
3124 | sync_max_show(mddev_t *mddev, char *page) | |
3125 | { | |
3126 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3127 | mddev->sync_speed_max ? "local": "system"); | |
3128 | } | |
3129 | ||
3130 | static ssize_t | |
3131 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3132 | { | |
3133 | int max; | |
3134 | char *e; | |
3135 | if (strncmp(buf, "system", 6)==0) { | |
3136 | mddev->sync_speed_max = 0; | |
3137 | return len; | |
3138 | } | |
3139 | max = simple_strtoul(buf, &e, 10); | |
3140 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3141 | return -EINVAL; | |
3142 | mddev->sync_speed_max = max; | |
3143 | return len; | |
3144 | } | |
3145 | ||
3146 | static struct md_sysfs_entry md_sync_max = | |
3147 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3148 | ||
d7f3d291 IP |
3149 | static ssize_t |
3150 | degraded_show(mddev_t *mddev, char *page) | |
3151 | { | |
3152 | return sprintf(page, "%d\n", mddev->degraded); | |
3153 | } | |
3154 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3155 | |
90b08710 BS |
3156 | static ssize_t |
3157 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3158 | { | |
3159 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3160 | } | |
3161 | ||
3162 | static ssize_t | |
3163 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3164 | { | |
3165 | long n; | |
3166 | ||
3167 | if (strict_strtol(buf, 10, &n)) | |
3168 | return -EINVAL; | |
3169 | ||
3170 | if (n != 0 && n != 1) | |
3171 | return -EINVAL; | |
3172 | ||
3173 | mddev->parallel_resync = n; | |
3174 | ||
3175 | if (mddev->sync_thread) | |
3176 | wake_up(&resync_wait); | |
3177 | ||
3178 | return len; | |
3179 | } | |
3180 | ||
3181 | /* force parallel resync, even with shared block devices */ | |
3182 | static struct md_sysfs_entry md_sync_force_parallel = | |
3183 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3184 | sync_force_parallel_show, sync_force_parallel_store); | |
3185 | ||
88202a0c N |
3186 | static ssize_t |
3187 | sync_speed_show(mddev_t *mddev, char *page) | |
3188 | { | |
3189 | unsigned long resync, dt, db; | |
9687a60c AN |
3190 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3191 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3192 | if (!dt) dt++; |
9687a60c AN |
3193 | db = resync - mddev->resync_mark_cnt; |
3194 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3195 | } |
3196 | ||
80ca3a44 | 3197 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3198 | |
3199 | static ssize_t | |
3200 | sync_completed_show(mddev_t *mddev, char *page) | |
3201 | { | |
3202 | unsigned long max_blocks, resync; | |
3203 | ||
3204 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3205 | max_blocks = mddev->resync_max_sectors; | |
3206 | else | |
3207 | max_blocks = mddev->size << 1; | |
3208 | ||
3209 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
3210 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
3211 | } | |
3212 | ||
80ca3a44 | 3213 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3214 | |
5e96ee65 NB |
3215 | static ssize_t |
3216 | min_sync_show(mddev_t *mddev, char *page) | |
3217 | { | |
3218 | return sprintf(page, "%llu\n", | |
3219 | (unsigned long long)mddev->resync_min); | |
3220 | } | |
3221 | static ssize_t | |
3222 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3223 | { | |
3224 | unsigned long long min; | |
3225 | if (strict_strtoull(buf, 10, &min)) | |
3226 | return -EINVAL; | |
3227 | if (min > mddev->resync_max) | |
3228 | return -EINVAL; | |
3229 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3230 | return -EBUSY; | |
3231 | ||
3232 | /* Must be a multiple of chunk_size */ | |
3233 | if (mddev->chunk_size) { | |
3234 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3235 | return -EINVAL; | |
3236 | } | |
3237 | mddev->resync_min = min; | |
3238 | ||
3239 | return len; | |
3240 | } | |
3241 | ||
3242 | static struct md_sysfs_entry md_min_sync = | |
3243 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3244 | ||
c6207277 N |
3245 | static ssize_t |
3246 | max_sync_show(mddev_t *mddev, char *page) | |
3247 | { | |
3248 | if (mddev->resync_max == MaxSector) | |
3249 | return sprintf(page, "max\n"); | |
3250 | else | |
3251 | return sprintf(page, "%llu\n", | |
3252 | (unsigned long long)mddev->resync_max); | |
3253 | } | |
3254 | static ssize_t | |
3255 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3256 | { | |
3257 | if (strncmp(buf, "max", 3) == 0) | |
3258 | mddev->resync_max = MaxSector; | |
3259 | else { | |
5e96ee65 NB |
3260 | unsigned long long max; |
3261 | if (strict_strtoull(buf, 10, &max)) | |
3262 | return -EINVAL; | |
3263 | if (max < mddev->resync_min) | |
c6207277 N |
3264 | return -EINVAL; |
3265 | if (max < mddev->resync_max && | |
3266 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3267 | return -EBUSY; | |
3268 | ||
3269 | /* Must be a multiple of chunk_size */ | |
3270 | if (mddev->chunk_size) { | |
3271 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3272 | return -EINVAL; | |
3273 | } | |
3274 | mddev->resync_max = max; | |
3275 | } | |
3276 | wake_up(&mddev->recovery_wait); | |
3277 | return len; | |
3278 | } | |
3279 | ||
3280 | static struct md_sysfs_entry md_max_sync = | |
3281 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3282 | ||
e464eafd N |
3283 | static ssize_t |
3284 | suspend_lo_show(mddev_t *mddev, char *page) | |
3285 | { | |
3286 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3287 | } | |
3288 | ||
3289 | static ssize_t | |
3290 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3291 | { | |
3292 | char *e; | |
3293 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3294 | ||
3295 | if (mddev->pers->quiesce == NULL) | |
3296 | return -EINVAL; | |
3297 | if (buf == e || (*e && *e != '\n')) | |
3298 | return -EINVAL; | |
3299 | if (new >= mddev->suspend_hi || | |
3300 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3301 | mddev->suspend_lo = new; | |
3302 | mddev->pers->quiesce(mddev, 2); | |
3303 | return len; | |
3304 | } else | |
3305 | return -EINVAL; | |
3306 | } | |
3307 | static struct md_sysfs_entry md_suspend_lo = | |
3308 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3309 | ||
3310 | ||
3311 | static ssize_t | |
3312 | suspend_hi_show(mddev_t *mddev, char *page) | |
3313 | { | |
3314 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3315 | } | |
3316 | ||
3317 | static ssize_t | |
3318 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3319 | { | |
3320 | char *e; | |
3321 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3322 | ||
3323 | if (mddev->pers->quiesce == NULL) | |
3324 | return -EINVAL; | |
3325 | if (buf == e || (*e && *e != '\n')) | |
3326 | return -EINVAL; | |
3327 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3328 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3329 | mddev->suspend_hi = new; | |
3330 | mddev->pers->quiesce(mddev, 1); | |
3331 | mddev->pers->quiesce(mddev, 0); | |
3332 | return len; | |
3333 | } else | |
3334 | return -EINVAL; | |
3335 | } | |
3336 | static struct md_sysfs_entry md_suspend_hi = | |
3337 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3338 | ||
08a02ecd N |
3339 | static ssize_t |
3340 | reshape_position_show(mddev_t *mddev, char *page) | |
3341 | { | |
3342 | if (mddev->reshape_position != MaxSector) | |
3343 | return sprintf(page, "%llu\n", | |
3344 | (unsigned long long)mddev->reshape_position); | |
3345 | strcpy(page, "none\n"); | |
3346 | return 5; | |
3347 | } | |
3348 | ||
3349 | static ssize_t | |
3350 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3351 | { | |
3352 | char *e; | |
3353 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3354 | if (mddev->pers) | |
3355 | return -EBUSY; | |
3356 | if (buf == e || (*e && *e != '\n')) | |
3357 | return -EINVAL; | |
3358 | mddev->reshape_position = new; | |
3359 | mddev->delta_disks = 0; | |
3360 | mddev->new_level = mddev->level; | |
3361 | mddev->new_layout = mddev->layout; | |
3362 | mddev->new_chunk = mddev->chunk_size; | |
3363 | return len; | |
3364 | } | |
3365 | ||
3366 | static struct md_sysfs_entry md_reshape_position = | |
3367 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3368 | reshape_position_store); | |
3369 | ||
e464eafd | 3370 | |
eae1701f N |
3371 | static struct attribute *md_default_attrs[] = { |
3372 | &md_level.attr, | |
d4dbd025 | 3373 | &md_layout.attr, |
eae1701f | 3374 | &md_raid_disks.attr, |
3b34380a | 3375 | &md_chunk_size.attr, |
a35b0d69 | 3376 | &md_size.attr, |
a94213b1 | 3377 | &md_resync_start.attr, |
8bb93aac | 3378 | &md_metadata.attr, |
6d7ff738 | 3379 | &md_new_device.attr, |
16f17b39 | 3380 | &md_safe_delay.attr, |
9e653b63 | 3381 | &md_array_state.attr, |
08a02ecd | 3382 | &md_reshape_position.attr, |
411036fa N |
3383 | NULL, |
3384 | }; | |
3385 | ||
3386 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3387 | &md_scan_mode.attr, |
9d88883e | 3388 | &md_mismatches.attr, |
88202a0c N |
3389 | &md_sync_min.attr, |
3390 | &md_sync_max.attr, | |
3391 | &md_sync_speed.attr, | |
90b08710 | 3392 | &md_sync_force_parallel.attr, |
88202a0c | 3393 | &md_sync_completed.attr, |
5e96ee65 | 3394 | &md_min_sync.attr, |
c6207277 | 3395 | &md_max_sync.attr, |
e464eafd N |
3396 | &md_suspend_lo.attr, |
3397 | &md_suspend_hi.attr, | |
9b1d1dac | 3398 | &md_bitmap.attr, |
d7f3d291 | 3399 | &md_degraded.attr, |
eae1701f N |
3400 | NULL, |
3401 | }; | |
411036fa N |
3402 | static struct attribute_group md_redundancy_group = { |
3403 | .name = NULL, | |
3404 | .attrs = md_redundancy_attrs, | |
3405 | }; | |
3406 | ||
eae1701f N |
3407 | |
3408 | static ssize_t | |
3409 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3410 | { | |
3411 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3412 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3413 | ssize_t rv; |
eae1701f N |
3414 | |
3415 | if (!entry->show) | |
3416 | return -EIO; | |
5dc5cf7d IM |
3417 | rv = mddev_lock(mddev); |
3418 | if (!rv) { | |
3419 | rv = entry->show(mddev, page); | |
3420 | mddev_unlock(mddev); | |
3421 | } | |
96de1e66 | 3422 | return rv; |
eae1701f N |
3423 | } |
3424 | ||
3425 | static ssize_t | |
3426 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3427 | const char *page, size_t length) | |
3428 | { | |
3429 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3430 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3431 | ssize_t rv; |
eae1701f N |
3432 | |
3433 | if (!entry->store) | |
3434 | return -EIO; | |
67463acb N |
3435 | if (!capable(CAP_SYS_ADMIN)) |
3436 | return -EACCES; | |
5dc5cf7d IM |
3437 | rv = mddev_lock(mddev); |
3438 | if (!rv) { | |
3439 | rv = entry->store(mddev, page, length); | |
3440 | mddev_unlock(mddev); | |
3441 | } | |
96de1e66 | 3442 | return rv; |
eae1701f N |
3443 | } |
3444 | ||
3445 | static void md_free(struct kobject *ko) | |
3446 | { | |
3447 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
3448 | |
3449 | if (mddev->sysfs_state) | |
3450 | sysfs_put(mddev->sysfs_state); | |
3451 | ||
3452 | if (mddev->gendisk) { | |
3453 | del_gendisk(mddev->gendisk); | |
3454 | put_disk(mddev->gendisk); | |
3455 | } | |
3456 | if (mddev->queue) | |
3457 | blk_cleanup_queue(mddev->queue); | |
3458 | ||
eae1701f N |
3459 | kfree(mddev); |
3460 | } | |
3461 | ||
3462 | static struct sysfs_ops md_sysfs_ops = { | |
3463 | .show = md_attr_show, | |
3464 | .store = md_attr_store, | |
3465 | }; | |
3466 | static struct kobj_type md_ktype = { | |
3467 | .release = md_free, | |
3468 | .sysfs_ops = &md_sysfs_ops, | |
3469 | .default_attrs = md_default_attrs, | |
3470 | }; | |
3471 | ||
1da177e4 LT |
3472 | int mdp_major = 0; |
3473 | ||
3474 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3475 | { | |
48c9c27b | 3476 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3477 | mddev_t *mddev = mddev_find(dev); |
3478 | struct gendisk *disk; | |
3479 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
3480 | int shift = partitioned ? MdpMinorShift : 0; | |
3481 | int unit = MINOR(dev) >> shift; | |
3830c62f | 3482 | int error; |
1da177e4 LT |
3483 | |
3484 | if (!mddev) | |
3485 | return NULL; | |
3486 | ||
48c9c27b | 3487 | mutex_lock(&disks_mutex); |
1da177e4 | 3488 | if (mddev->gendisk) { |
48c9c27b | 3489 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3490 | mddev_put(mddev); |
3491 | return NULL; | |
3492 | } | |
8b765398 N |
3493 | |
3494 | mddev->queue = blk_alloc_queue(GFP_KERNEL); | |
3495 | if (!mddev->queue) { | |
3496 | mutex_unlock(&disks_mutex); | |
3497 | mddev_put(mddev); | |
3498 | return NULL; | |
3499 | } | |
3500 | /* Can be unlocked because the queue is new: no concurrency */ | |
3501 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
3502 | ||
3503 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3504 | ||
1da177e4 LT |
3505 | disk = alloc_disk(1 << shift); |
3506 | if (!disk) { | |
48c9c27b | 3507 | mutex_unlock(&disks_mutex); |
8b765398 N |
3508 | blk_cleanup_queue(mddev->queue); |
3509 | mddev->queue = NULL; | |
1da177e4 LT |
3510 | mddev_put(mddev); |
3511 | return NULL; | |
3512 | } | |
3513 | disk->major = MAJOR(dev); | |
3514 | disk->first_minor = unit << shift; | |
ce7b0f46 | 3515 | if (partitioned) |
1da177e4 | 3516 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3517 | else |
1da177e4 | 3518 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3519 | disk->fops = &md_fops; |
3520 | disk->private_data = mddev; | |
3521 | disk->queue = mddev->queue; | |
92850bbd N |
3522 | /* Allow extended partitions. This makes the |
3523 | * 'mdp' device redundant, but we can really | |
3524 | * remove it now. | |
3525 | */ | |
3526 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
3527 | add_disk(disk); |
3528 | mddev->gendisk = disk; | |
ed9e1982 TH |
3529 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
3530 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
f48ed538 | 3531 | mutex_unlock(&disks_mutex); |
3830c62f | 3532 | if (error) |
5e55e2f5 N |
3533 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3534 | disk->disk_name); | |
b62b7590 | 3535 | else { |
3830c62f | 3536 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
3537 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
3538 | } | |
1da177e4 LT |
3539 | return NULL; |
3540 | } | |
3541 | ||
1da177e4 LT |
3542 | static void md_safemode_timeout(unsigned long data) |
3543 | { | |
3544 | mddev_t *mddev = (mddev_t *) data; | |
3545 | ||
0fd62b86 NB |
3546 | if (!atomic_read(&mddev->writes_pending)) { |
3547 | mddev->safemode = 1; | |
3548 | if (mddev->external) | |
b62b7590 | 3549 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 3550 | } |
1da177e4 LT |
3551 | md_wakeup_thread(mddev->thread); |
3552 | } | |
3553 | ||
6ff8d8ec | 3554 | static int start_dirty_degraded; |
1da177e4 LT |
3555 | |
3556 | static int do_md_run(mddev_t * mddev) | |
3557 | { | |
2604b703 | 3558 | int err; |
1da177e4 | 3559 | int chunk_size; |
1da177e4 LT |
3560 | mdk_rdev_t *rdev; |
3561 | struct gendisk *disk; | |
2604b703 | 3562 | struct mdk_personality *pers; |
1da177e4 LT |
3563 | char b[BDEVNAME_SIZE]; |
3564 | ||
a757e64c N |
3565 | if (list_empty(&mddev->disks)) |
3566 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3567 | return -EINVAL; |
1da177e4 LT |
3568 | |
3569 | if (mddev->pers) | |
3570 | return -EBUSY; | |
3571 | ||
3572 | /* | |
3573 | * Analyze all RAID superblock(s) | |
3574 | */ | |
1ec4a939 N |
3575 | if (!mddev->raid_disks) { |
3576 | if (!mddev->persistent) | |
3577 | return -EINVAL; | |
a757e64c | 3578 | analyze_sbs(mddev); |
1ec4a939 | 3579 | } |
1da177e4 LT |
3580 | |
3581 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3582 | |
3583 | if (chunk_size) { | |
1da177e4 LT |
3584 | if (chunk_size > MAX_CHUNK_SIZE) { |
3585 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3586 | chunk_size, MAX_CHUNK_SIZE); | |
3587 | return -EINVAL; | |
3588 | } | |
3589 | /* | |
4bbf3771 | 3590 | * chunk-size has to be a power of 2 |
1da177e4 LT |
3591 | */ |
3592 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3593 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3594 | return -EINVAL; |
3595 | } | |
1da177e4 LT |
3596 | |
3597 | /* devices must have minimum size of one chunk */ | |
159ec1fc | 3598 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3599 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3600 | continue; |
3601 | if (rdev->size < chunk_size / 1024) { | |
3602 | printk(KERN_WARNING | |
3603 | "md: Dev %s smaller than chunk_size:" | |
3604 | " %lluk < %dk\n", | |
3605 | bdevname(rdev->bdev,b), | |
3606 | (unsigned long long)rdev->size, | |
3607 | chunk_size / 1024); | |
3608 | return -EINVAL; | |
3609 | } | |
3610 | } | |
3611 | } | |
3612 | ||
d9d166c2 N |
3613 | if (mddev->level != LEVEL_NONE) |
3614 | request_module("md-level-%d", mddev->level); | |
3615 | else if (mddev->clevel[0]) | |
3616 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3617 | |
3618 | /* | |
3619 | * Drop all container device buffers, from now on | |
3620 | * the only valid external interface is through the md | |
3621 | * device. | |
1da177e4 | 3622 | */ |
159ec1fc | 3623 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3624 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3625 | continue; |
3626 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3627 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3628 | |
3629 | /* perform some consistency tests on the device. | |
3630 | * We don't want the data to overlap the metadata, | |
3631 | * Internal Bitmap issues has handled elsewhere. | |
3632 | */ | |
0f420358 | 3633 | if (rdev->data_offset < rdev->sb_start) { |
f0d76d70 N |
3634 | if (mddev->size && |
3635 | rdev->data_offset + mddev->size*2 | |
0f420358 | 3636 | > rdev->sb_start) { |
f0d76d70 N |
3637 | printk("md: %s: data overlaps metadata\n", |
3638 | mdname(mddev)); | |
3639 | return -EINVAL; | |
3640 | } | |
3641 | } else { | |
0f420358 | 3642 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
3643 | > rdev->data_offset) { |
3644 | printk("md: %s: metadata overlaps data\n", | |
3645 | mdname(mddev)); | |
3646 | return -EINVAL; | |
3647 | } | |
3648 | } | |
3c0ee63a | 3649 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
3650 | } |
3651 | ||
3652 | md_probe(mddev->unit, NULL, NULL); | |
3653 | disk = mddev->gendisk; | |
3654 | if (!disk) | |
3655 | return -ENOMEM; | |
3656 | ||
3657 | spin_lock(&pers_lock); | |
d9d166c2 | 3658 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3659 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3660 | spin_unlock(&pers_lock); |
d9d166c2 N |
3661 | if (mddev->level != LEVEL_NONE) |
3662 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3663 | mddev->level); | |
3664 | else | |
3665 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3666 | mddev->clevel); | |
1da177e4 LT |
3667 | return -EINVAL; |
3668 | } | |
2604b703 | 3669 | mddev->pers = pers; |
1da177e4 | 3670 | spin_unlock(&pers_lock); |
d9d166c2 N |
3671 | mddev->level = pers->level; |
3672 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3673 | |
f6705578 | 3674 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3675 | pers->start_reshape == NULL) { |
f6705578 N |
3676 | /* This personality cannot handle reshaping... */ |
3677 | mddev->pers = NULL; | |
3678 | module_put(pers->owner); | |
3679 | return -EINVAL; | |
3680 | } | |
3681 | ||
7dd5e7c3 N |
3682 | if (pers->sync_request) { |
3683 | /* Warn if this is a potentially silly | |
3684 | * configuration. | |
3685 | */ | |
3686 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3687 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 3688 | int warned = 0; |
159ec1fc CR |
3689 | |
3690 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
3691 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
3692 | if (rdev < rdev2 && |
3693 | rdev->bdev->bd_contains == | |
3694 | rdev2->bdev->bd_contains) { | |
3695 | printk(KERN_WARNING | |
3696 | "%s: WARNING: %s appears to be" | |
3697 | " on the same physical disk as" | |
3698 | " %s.\n", | |
3699 | mdname(mddev), | |
3700 | bdevname(rdev->bdev,b), | |
3701 | bdevname(rdev2->bdev,b2)); | |
3702 | warned = 1; | |
3703 | } | |
3704 | } | |
159ec1fc | 3705 | |
7dd5e7c3 N |
3706 | if (warned) |
3707 | printk(KERN_WARNING | |
3708 | "True protection against single-disk" | |
3709 | " failure might be compromised.\n"); | |
3710 | } | |
3711 | ||
657390d2 | 3712 | mddev->recovery = 0; |
1da177e4 | 3713 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3714 | mddev->barriers_work = 1; |
6ff8d8ec | 3715 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3716 | |
f91de92e N |
3717 | if (start_readonly) |
3718 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3719 | ||
b15c2e57 | 3720 | err = mddev->pers->run(mddev); |
13e53df3 AN |
3721 | if (err) |
3722 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3723 | else if (mddev->pers->sync_request) { | |
b15c2e57 N |
3724 | err = bitmap_create(mddev); |
3725 | if (err) { | |
3726 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3727 | mdname(mddev), err); | |
3728 | mddev->pers->stop(mddev); | |
3729 | } | |
3730 | } | |
1da177e4 | 3731 | if (err) { |
1da177e4 LT |
3732 | module_put(mddev->pers->owner); |
3733 | mddev->pers = NULL; | |
32a7627c N |
3734 | bitmap_destroy(mddev); |
3735 | return err; | |
1da177e4 | 3736 | } |
5e55e2f5 N |
3737 | if (mddev->pers->sync_request) { |
3738 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3739 | printk(KERN_WARNING | |
3740 | "md: cannot register extra attributes for %s\n", | |
3741 | mdname(mddev)); | |
0c3573f1 | 3742 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 3743 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
3744 | mddev->ro = 0; |
3745 | ||
1da177e4 LT |
3746 | atomic_set(&mddev->writes_pending,0); |
3747 | mddev->safemode = 0; | |
3748 | mddev->safemode_timer.function = md_safemode_timeout; | |
3749 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3750 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3751 | mddev->in_sync = 1; |
86e6ffdd | 3752 | |
159ec1fc | 3753 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
3754 | if (rdev->raid_disk >= 0) { |
3755 | char nm[20]; | |
3756 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3757 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3758 | printk("md: cannot register %s for %s\n", | |
3759 | nm, mdname(mddev)); | |
86e6ffdd | 3760 | } |
1da177e4 LT |
3761 | |
3762 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3763 | ||
850b2b42 N |
3764 | if (mddev->flags) |
3765 | md_update_sb(mddev, 0); | |
1da177e4 | 3766 | |
f233ea5c | 3767 | set_capacity(disk, mddev->array_sectors); |
1da177e4 LT |
3768 | |
3769 | /* If we call blk_queue_make_request here, it will | |
3770 | * re-initialise max_sectors etc which may have been | |
3771 | * refined inside -> run. So just set the bits we need to set. | |
3772 | * Most initialisation happended when we called | |
3773 | * blk_queue_make_request(..., md_fail_request) | |
3774 | * earlier. | |
3775 | */ | |
3776 | mddev->queue->queuedata = mddev; | |
3777 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3778 | ||
5fd6c1dc N |
3779 | /* If there is a partially-recovered drive we need to |
3780 | * start recovery here. If we leave it to md_check_recovery, | |
3781 | * it will remove the drives and not do the right thing | |
3782 | */ | |
0b8c9de0 | 3783 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 3784 | int spares = 0; |
159ec1fc | 3785 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
3786 | if (rdev->raid_disk >= 0 && |
3787 | !test_bit(In_sync, &rdev->flags) && | |
3788 | !test_bit(Faulty, &rdev->flags)) | |
3789 | /* complete an interrupted recovery */ | |
3790 | spares++; | |
3791 | if (spares && mddev->pers->sync_request) { | |
3792 | mddev->recovery = 0; | |
3793 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3794 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3795 | mddev, | |
3796 | "%s_resync"); | |
3797 | if (!mddev->sync_thread) { | |
3798 | printk(KERN_ERR "%s: could not start resync" | |
3799 | " thread...\n", | |
3800 | mdname(mddev)); | |
3801 | /* leave the spares where they are, it shouldn't hurt */ | |
3802 | mddev->recovery = 0; | |
0b8c9de0 | 3803 | } |
5fd6c1dc N |
3804 | } |
3805 | } | |
0b8c9de0 N |
3806 | md_wakeup_thread(mddev->thread); |
3807 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3808 | |
44ce6294 | 3809 | mddev->changed = 1; |
d7603b7e | 3810 | md_new_event(mddev); |
b62b7590 | 3811 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
3812 | if (mddev->sysfs_action) |
3813 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 3814 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 3815 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
3816 | return 0; |
3817 | } | |
3818 | ||
3819 | static int restart_array(mddev_t *mddev) | |
3820 | { | |
3821 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 3822 | |
80fab1d7 | 3823 | /* Complain if it has no devices */ |
1da177e4 | 3824 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
3825 | return -ENXIO; |
3826 | if (!mddev->pers) | |
3827 | return -EINVAL; | |
3828 | if (!mddev->ro) | |
3829 | return -EBUSY; | |
3830 | mddev->safemode = 0; | |
3831 | mddev->ro = 0; | |
3832 | set_disk_ro(disk, 0); | |
3833 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3834 | mdname(mddev)); | |
3835 | /* Kick recovery or resync if necessary */ | |
3836 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3837 | md_wakeup_thread(mddev->thread); | |
3838 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 3839 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 3840 | return 0; |
1da177e4 LT |
3841 | } |
3842 | ||
acc55e22 N |
3843 | /* similar to deny_write_access, but accounts for our holding a reference |
3844 | * to the file ourselves */ | |
3845 | static int deny_bitmap_write_access(struct file * file) | |
3846 | { | |
3847 | struct inode *inode = file->f_mapping->host; | |
3848 | ||
3849 | spin_lock(&inode->i_lock); | |
3850 | if (atomic_read(&inode->i_writecount) > 1) { | |
3851 | spin_unlock(&inode->i_lock); | |
3852 | return -ETXTBSY; | |
3853 | } | |
3854 | atomic_set(&inode->i_writecount, -1); | |
3855 | spin_unlock(&inode->i_lock); | |
3856 | ||
3857 | return 0; | |
3858 | } | |
3859 | ||
3860 | static void restore_bitmap_write_access(struct file *file) | |
3861 | { | |
3862 | struct inode *inode = file->f_mapping->host; | |
3863 | ||
3864 | spin_lock(&inode->i_lock); | |
3865 | atomic_set(&inode->i_writecount, 1); | |
3866 | spin_unlock(&inode->i_lock); | |
3867 | } | |
3868 | ||
9e653b63 N |
3869 | /* mode: |
3870 | * 0 - completely stop and dis-assemble array | |
3871 | * 1 - switch to readonly | |
3872 | * 2 - stop but do not disassemble array | |
3873 | */ | |
df5b20cf | 3874 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
3875 | { |
3876 | int err = 0; | |
3877 | struct gendisk *disk = mddev->gendisk; | |
3878 | ||
f2ea68cf | 3879 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf NB |
3880 | printk("md: %s still in use.\n",mdname(mddev)); |
3881 | return -EBUSY; | |
3882 | } | |
3883 | ||
1da177e4 | 3884 | if (mddev->pers) { |
1da177e4 LT |
3885 | |
3886 | if (mddev->sync_thread) { | |
5fd6c1dc | 3887 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3888 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3889 | md_unregister_thread(mddev->sync_thread); | |
3890 | mddev->sync_thread = NULL; | |
3891 | } | |
3892 | ||
3893 | del_timer_sync(&mddev->safemode_timer); | |
3894 | ||
9e653b63 N |
3895 | switch(mode) { |
3896 | case 1: /* readonly */ | |
1da177e4 | 3897 | err = -ENXIO; |
f91de92e | 3898 | if (mddev->ro==1) |
1da177e4 LT |
3899 | goto out; |
3900 | mddev->ro = 1; | |
9e653b63 N |
3901 | break; |
3902 | case 0: /* disassemble */ | |
3903 | case 2: /* stop */ | |
6b8b3e8a | 3904 | bitmap_flush(mddev); |
a9701a30 | 3905 | md_super_wait(mddev); |
1da177e4 LT |
3906 | if (mddev->ro) |
3907 | set_disk_ro(disk, 0); | |
3908 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3909 | mddev->pers->stop(mddev); | |
d1b5380c N |
3910 | mddev->queue->merge_bvec_fn = NULL; |
3911 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 3912 | mddev->queue->backing_dev_info.congested_fn = NULL; |
0c3573f1 | 3913 | if (mddev->pers->sync_request) { |
411036fa | 3914 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
0c3573f1 N |
3915 | if (mddev->sysfs_action) |
3916 | sysfs_put(mddev->sysfs_action); | |
3917 | mddev->sysfs_action = NULL; | |
3918 | } | |
1da177e4 LT |
3919 | module_put(mddev->pers->owner); |
3920 | mddev->pers = NULL; | |
4f54b0e9 | 3921 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 3922 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 N |
3923 | |
3924 | set_capacity(disk, 0); | |
44ce6294 | 3925 | mddev->changed = 1; |
0d4ca600 | 3926 | |
1da177e4 LT |
3927 | if (mddev->ro) |
3928 | mddev->ro = 0; | |
3929 | } | |
850b2b42 | 3930 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
3931 | /* mark array as shutdown cleanly */ |
3932 | mddev->in_sync = 1; | |
850b2b42 | 3933 | md_update_sb(mddev, 1); |
1da177e4 | 3934 | } |
9e653b63 | 3935 | if (mode == 1) |
1da177e4 | 3936 | set_disk_ro(disk, 1); |
5fd6c1dc | 3937 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3938 | } |
32a7627c | 3939 | |
1da177e4 LT |
3940 | /* |
3941 | * Free resources if final stop | |
3942 | */ | |
9e653b63 | 3943 | if (mode == 0) { |
86e6ffdd | 3944 | mdk_rdev_t *rdev; |
0d4ca600 | 3945 | |
1da177e4 LT |
3946 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
3947 | ||
978f946b N |
3948 | bitmap_destroy(mddev); |
3949 | if (mddev->bitmap_file) { | |
acc55e22 | 3950 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3951 | fput(mddev->bitmap_file); |
3952 | mddev->bitmap_file = NULL; | |
3953 | } | |
3954 | mddev->bitmap_offset = 0; | |
3955 | ||
159ec1fc | 3956 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
3957 | if (rdev->raid_disk >= 0) { |
3958 | char nm[20]; | |
3959 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3960 | sysfs_remove_link(&mddev->kobj, nm); | |
3961 | } | |
3962 | ||
177a99b2 | 3963 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
3964 | flush_scheduled_work(); |
3965 | ||
1da177e4 LT |
3966 | export_array(mddev); |
3967 | ||
f233ea5c | 3968 | mddev->array_sectors = 0; |
9e653b63 N |
3969 | mddev->size = 0; |
3970 | mddev->raid_disks = 0; | |
a94213b1 | 3971 | mddev->recovery_cp = 0; |
5e96ee65 | 3972 | mddev->resync_min = 0; |
c6207277 | 3973 | mddev->resync_max = MaxSector; |
08a02ecd | 3974 | mddev->reshape_position = MaxSector; |
e691063a | 3975 | mddev->external = 0; |
1ec4a939 | 3976 | mddev->persistent = 0; |
d897dbf9 N |
3977 | mddev->level = LEVEL_NONE; |
3978 | mddev->clevel[0] = 0; | |
3979 | mddev->flags = 0; | |
3980 | mddev->ro = 0; | |
3981 | mddev->metadata_type[0] = 0; | |
3982 | mddev->chunk_size = 0; | |
3983 | mddev->ctime = mddev->utime = 0; | |
3984 | mddev->layout = 0; | |
3985 | mddev->max_disks = 0; | |
3986 | mddev->events = 0; | |
3987 | mddev->delta_disks = 0; | |
3988 | mddev->new_level = LEVEL_NONE; | |
3989 | mddev->new_layout = 0; | |
3990 | mddev->new_chunk = 0; | |
3991 | mddev->curr_resync = 0; | |
3992 | mddev->resync_mismatches = 0; | |
3993 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
3994 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
3995 | mddev->recovery = 0; | |
3996 | mddev->in_sync = 0; | |
3997 | mddev->changed = 0; | |
3998 | mddev->degraded = 0; | |
3999 | mddev->barriers_work = 0; | |
4000 | mddev->safemode = 0; | |
934d9c23 | 4001 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
9e653b63 | 4002 | |
a8a55c38 | 4003 | } else if (mddev->pers) |
1da177e4 LT |
4004 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4005 | mdname(mddev)); | |
4006 | err = 0; | |
d7603b7e | 4007 | md_new_event(mddev); |
b62b7590 | 4008 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4009 | out: |
4010 | return err; | |
4011 | } | |
4012 | ||
fdee8ae4 | 4013 | #ifndef MODULE |
1da177e4 LT |
4014 | static void autorun_array(mddev_t *mddev) |
4015 | { | |
4016 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4017 | int err; |
4018 | ||
a757e64c | 4019 | if (list_empty(&mddev->disks)) |
1da177e4 | 4020 | return; |
1da177e4 LT |
4021 | |
4022 | printk(KERN_INFO "md: running: "); | |
4023 | ||
159ec1fc | 4024 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4025 | char b[BDEVNAME_SIZE]; |
4026 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4027 | } | |
4028 | printk("\n"); | |
4029 | ||
d710e138 | 4030 | err = do_md_run(mddev); |
1da177e4 LT |
4031 | if (err) { |
4032 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4033 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4034 | } |
4035 | } | |
4036 | ||
4037 | /* | |
4038 | * lets try to run arrays based on all disks that have arrived | |
4039 | * until now. (those are in pending_raid_disks) | |
4040 | * | |
4041 | * the method: pick the first pending disk, collect all disks with | |
4042 | * the same UUID, remove all from the pending list and put them into | |
4043 | * the 'same_array' list. Then order this list based on superblock | |
4044 | * update time (freshest comes first), kick out 'old' disks and | |
4045 | * compare superblocks. If everything's fine then run it. | |
4046 | * | |
4047 | * If "unit" is allocated, then bump its reference count | |
4048 | */ | |
4049 | static void autorun_devices(int part) | |
4050 | { | |
159ec1fc | 4051 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4052 | mddev_t *mddev; |
4053 | char b[BDEVNAME_SIZE]; | |
4054 | ||
4055 | printk(KERN_INFO "md: autorun ...\n"); | |
4056 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4057 | int unit; |
1da177e4 | 4058 | dev_t dev; |
ad01c9e3 | 4059 | LIST_HEAD(candidates); |
1da177e4 LT |
4060 | rdev0 = list_entry(pending_raid_disks.next, |
4061 | mdk_rdev_t, same_set); | |
4062 | ||
4063 | printk(KERN_INFO "md: considering %s ...\n", | |
4064 | bdevname(rdev0->bdev,b)); | |
4065 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4066 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4067 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4068 | printk(KERN_INFO "md: adding %s ...\n", | |
4069 | bdevname(rdev->bdev,b)); | |
4070 | list_move(&rdev->same_set, &candidates); | |
4071 | } | |
4072 | /* | |
4073 | * now we have a set of devices, with all of them having | |
4074 | * mostly sane superblocks. It's time to allocate the | |
4075 | * mddev. | |
4076 | */ | |
e8703fe1 N |
4077 | if (part) { |
4078 | dev = MKDEV(mdp_major, | |
4079 | rdev0->preferred_minor << MdpMinorShift); | |
4080 | unit = MINOR(dev) >> MdpMinorShift; | |
4081 | } else { | |
4082 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4083 | unit = MINOR(dev); | |
4084 | } | |
4085 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4086 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4087 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4088 | break; | |
4089 | } | |
1da177e4 LT |
4090 | |
4091 | md_probe(dev, NULL, NULL); | |
4092 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4093 | if (!mddev || !mddev->gendisk) { |
4094 | if (mddev) | |
4095 | mddev_put(mddev); | |
4096 | printk(KERN_ERR | |
1da177e4 LT |
4097 | "md: cannot allocate memory for md drive.\n"); |
4098 | break; | |
4099 | } | |
4100 | if (mddev_lock(mddev)) | |
4101 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4102 | mdname(mddev)); | |
4103 | else if (mddev->raid_disks || mddev->major_version | |
4104 | || !list_empty(&mddev->disks)) { | |
4105 | printk(KERN_WARNING | |
4106 | "md: %s already running, cannot run %s\n", | |
4107 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4108 | mddev_unlock(mddev); | |
4109 | } else { | |
4110 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4111 | mddev->persistent = 1; |
159ec1fc | 4112 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4113 | list_del_init(&rdev->same_set); |
4114 | if (bind_rdev_to_array(rdev, mddev)) | |
4115 | export_rdev(rdev); | |
4116 | } | |
4117 | autorun_array(mddev); | |
4118 | mddev_unlock(mddev); | |
4119 | } | |
4120 | /* on success, candidates will be empty, on error | |
4121 | * it won't... | |
4122 | */ | |
159ec1fc | 4123 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4124 | list_del_init(&rdev->same_set); |
1da177e4 | 4125 | export_rdev(rdev); |
4b80991c | 4126 | } |
1da177e4 LT |
4127 | mddev_put(mddev); |
4128 | } | |
4129 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4130 | } | |
fdee8ae4 | 4131 | #endif /* !MODULE */ |
1da177e4 | 4132 | |
1da177e4 LT |
4133 | static int get_version(void __user * arg) |
4134 | { | |
4135 | mdu_version_t ver; | |
4136 | ||
4137 | ver.major = MD_MAJOR_VERSION; | |
4138 | ver.minor = MD_MINOR_VERSION; | |
4139 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4140 | ||
4141 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4142 | return -EFAULT; | |
4143 | ||
4144 | return 0; | |
4145 | } | |
4146 | ||
4147 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4148 | { | |
4149 | mdu_array_info_t info; | |
4150 | int nr,working,active,failed,spare; | |
4151 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4152 | |
4153 | nr=working=active=failed=spare=0; | |
159ec1fc | 4154 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4155 | nr++; |
b2d444d7 | 4156 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4157 | failed++; |
4158 | else { | |
4159 | working++; | |
b2d444d7 | 4160 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4161 | active++; |
4162 | else | |
4163 | spare++; | |
4164 | } | |
4165 | } | |
4166 | ||
4167 | info.major_version = mddev->major_version; | |
4168 | info.minor_version = mddev->minor_version; | |
4169 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4170 | info.ctime = mddev->ctime; | |
4171 | info.level = mddev->level; | |
4172 | info.size = mddev->size; | |
284ae7ca N |
4173 | if (info.size != mddev->size) /* overflow */ |
4174 | info.size = -1; | |
1da177e4 LT |
4175 | info.nr_disks = nr; |
4176 | info.raid_disks = mddev->raid_disks; | |
4177 | info.md_minor = mddev->md_minor; | |
4178 | info.not_persistent= !mddev->persistent; | |
4179 | ||
4180 | info.utime = mddev->utime; | |
4181 | info.state = 0; | |
4182 | if (mddev->in_sync) | |
4183 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4184 | if (mddev->bitmap && mddev->bitmap_offset) |
4185 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4186 | info.active_disks = active; |
4187 | info.working_disks = working; | |
4188 | info.failed_disks = failed; | |
4189 | info.spare_disks = spare; | |
4190 | ||
4191 | info.layout = mddev->layout; | |
4192 | info.chunk_size = mddev->chunk_size; | |
4193 | ||
4194 | if (copy_to_user(arg, &info, sizeof(info))) | |
4195 | return -EFAULT; | |
4196 | ||
4197 | return 0; | |
4198 | } | |
4199 | ||
87162a28 | 4200 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4201 | { |
4202 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4203 | char *ptr, *buf = NULL; | |
4204 | int err = -ENOMEM; | |
4205 | ||
b5470dc5 DW |
4206 | if (md_allow_write(mddev)) |
4207 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4208 | else | |
4209 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4210 | |
32a7627c N |
4211 | if (!file) |
4212 | goto out; | |
4213 | ||
4214 | /* bitmap disabled, zero the first byte and copy out */ | |
4215 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4216 | file->pathname[0] = '\0'; | |
4217 | goto copy_out; | |
4218 | } | |
4219 | ||
4220 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4221 | if (!buf) | |
4222 | goto out; | |
4223 | ||
6bcfd601 CH |
4224 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4225 | if (IS_ERR(ptr)) | |
32a7627c N |
4226 | goto out; |
4227 | ||
4228 | strcpy(file->pathname, ptr); | |
4229 | ||
4230 | copy_out: | |
4231 | err = 0; | |
4232 | if (copy_to_user(arg, file, sizeof(*file))) | |
4233 | err = -EFAULT; | |
4234 | out: | |
4235 | kfree(buf); | |
4236 | kfree(file); | |
4237 | return err; | |
4238 | } | |
4239 | ||
1da177e4 LT |
4240 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4241 | { | |
4242 | mdu_disk_info_t info; | |
1da177e4 LT |
4243 | mdk_rdev_t *rdev; |
4244 | ||
4245 | if (copy_from_user(&info, arg, sizeof(info))) | |
4246 | return -EFAULT; | |
4247 | ||
26ef379f | 4248 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4249 | if (rdev) { |
4250 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4251 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4252 | info.raid_disk = rdev->raid_disk; | |
4253 | info.state = 0; | |
b2d444d7 | 4254 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4255 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4256 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4257 | info.state |= (1<<MD_DISK_ACTIVE); |
4258 | info.state |= (1<<MD_DISK_SYNC); | |
4259 | } | |
8ddf9efe N |
4260 | if (test_bit(WriteMostly, &rdev->flags)) |
4261 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4262 | } else { |
4263 | info.major = info.minor = 0; | |
4264 | info.raid_disk = -1; | |
4265 | info.state = (1<<MD_DISK_REMOVED); | |
4266 | } | |
4267 | ||
4268 | if (copy_to_user(arg, &info, sizeof(info))) | |
4269 | return -EFAULT; | |
4270 | ||
4271 | return 0; | |
4272 | } | |
4273 | ||
4274 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4275 | { | |
4276 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4277 | mdk_rdev_t *rdev; | |
4278 | dev_t dev = MKDEV(info->major,info->minor); | |
4279 | ||
4280 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4281 | return -EOVERFLOW; | |
4282 | ||
4283 | if (!mddev->raid_disks) { | |
4284 | int err; | |
4285 | /* expecting a device which has a superblock */ | |
4286 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4287 | if (IS_ERR(rdev)) { | |
4288 | printk(KERN_WARNING | |
4289 | "md: md_import_device returned %ld\n", | |
4290 | PTR_ERR(rdev)); | |
4291 | return PTR_ERR(rdev); | |
4292 | } | |
4293 | if (!list_empty(&mddev->disks)) { | |
4294 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4295 | mdk_rdev_t, same_set); | |
4296 | int err = super_types[mddev->major_version] | |
4297 | .load_super(rdev, rdev0, mddev->minor_version); | |
4298 | if (err < 0) { | |
4299 | printk(KERN_WARNING | |
4300 | "md: %s has different UUID to %s\n", | |
4301 | bdevname(rdev->bdev,b), | |
4302 | bdevname(rdev0->bdev,b2)); | |
4303 | export_rdev(rdev); | |
4304 | return -EINVAL; | |
4305 | } | |
4306 | } | |
4307 | err = bind_rdev_to_array(rdev, mddev); | |
4308 | if (err) | |
4309 | export_rdev(rdev); | |
4310 | return err; | |
4311 | } | |
4312 | ||
4313 | /* | |
4314 | * add_new_disk can be used once the array is assembled | |
4315 | * to add "hot spares". They must already have a superblock | |
4316 | * written | |
4317 | */ | |
4318 | if (mddev->pers) { | |
4319 | int err; | |
4320 | if (!mddev->pers->hot_add_disk) { | |
4321 | printk(KERN_WARNING | |
4322 | "%s: personality does not support diskops!\n", | |
4323 | mdname(mddev)); | |
4324 | return -EINVAL; | |
4325 | } | |
7b1e35f6 N |
4326 | if (mddev->persistent) |
4327 | rdev = md_import_device(dev, mddev->major_version, | |
4328 | mddev->minor_version); | |
4329 | else | |
4330 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4331 | if (IS_ERR(rdev)) { |
4332 | printk(KERN_WARNING | |
4333 | "md: md_import_device returned %ld\n", | |
4334 | PTR_ERR(rdev)); | |
4335 | return PTR_ERR(rdev); | |
4336 | } | |
41158c7e N |
4337 | /* set save_raid_disk if appropriate */ |
4338 | if (!mddev->persistent) { | |
4339 | if (info->state & (1<<MD_DISK_SYNC) && | |
4340 | info->raid_disk < mddev->raid_disks) | |
4341 | rdev->raid_disk = info->raid_disk; | |
4342 | else | |
4343 | rdev->raid_disk = -1; | |
4344 | } else | |
4345 | super_types[mddev->major_version]. | |
4346 | validate_super(mddev, rdev); | |
4347 | rdev->saved_raid_disk = rdev->raid_disk; | |
4348 | ||
b2d444d7 | 4349 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4350 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4351 | set_bit(WriteMostly, &rdev->flags); | |
4352 | ||
1da177e4 LT |
4353 | rdev->raid_disk = -1; |
4354 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4355 | if (!err && !mddev->pers->hot_remove_disk) { |
4356 | /* If there is hot_add_disk but no hot_remove_disk | |
4357 | * then added disks for geometry changes, | |
4358 | * and should be added immediately. | |
4359 | */ | |
4360 | super_types[mddev->major_version]. | |
4361 | validate_super(mddev, rdev); | |
4362 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4363 | if (err) | |
4364 | unbind_rdev_from_array(rdev); | |
4365 | } | |
1da177e4 LT |
4366 | if (err) |
4367 | export_rdev(rdev); | |
52664732 | 4368 | else |
3c0ee63a | 4369 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4370 | |
17571284 | 4371 | md_update_sb(mddev, 1); |
72a23c21 NB |
4372 | if (mddev->degraded) |
4373 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4374 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4375 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4376 | return err; |
4377 | } | |
4378 | ||
4379 | /* otherwise, add_new_disk is only allowed | |
4380 | * for major_version==0 superblocks | |
4381 | */ | |
4382 | if (mddev->major_version != 0) { | |
4383 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4384 | mdname(mddev)); | |
4385 | return -EINVAL; | |
4386 | } | |
4387 | ||
4388 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4389 | int err; | |
d710e138 | 4390 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4391 | if (IS_ERR(rdev)) { |
4392 | printk(KERN_WARNING | |
4393 | "md: error, md_import_device() returned %ld\n", | |
4394 | PTR_ERR(rdev)); | |
4395 | return PTR_ERR(rdev); | |
4396 | } | |
4397 | rdev->desc_nr = info->number; | |
4398 | if (info->raid_disk < mddev->raid_disks) | |
4399 | rdev->raid_disk = info->raid_disk; | |
4400 | else | |
4401 | rdev->raid_disk = -1; | |
4402 | ||
1da177e4 | 4403 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4404 | if (info->state & (1<<MD_DISK_SYNC)) |
4405 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4406 | |
8ddf9efe N |
4407 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4408 | set_bit(WriteMostly, &rdev->flags); | |
4409 | ||
1da177e4 LT |
4410 | if (!mddev->persistent) { |
4411 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4412 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4413 | } else |
0f420358 | 4414 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
e7debaa4 | 4415 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4416 | |
2bf071bf N |
4417 | err = bind_rdev_to_array(rdev, mddev); |
4418 | if (err) { | |
4419 | export_rdev(rdev); | |
4420 | return err; | |
4421 | } | |
1da177e4 LT |
4422 | } |
4423 | ||
4424 | return 0; | |
4425 | } | |
4426 | ||
4427 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4428 | { | |
4429 | char b[BDEVNAME_SIZE]; | |
4430 | mdk_rdev_t *rdev; | |
4431 | ||
1da177e4 LT |
4432 | rdev = find_rdev(mddev, dev); |
4433 | if (!rdev) | |
4434 | return -ENXIO; | |
4435 | ||
4436 | if (rdev->raid_disk >= 0) | |
4437 | goto busy; | |
4438 | ||
4439 | kick_rdev_from_array(rdev); | |
850b2b42 | 4440 | md_update_sb(mddev, 1); |
d7603b7e | 4441 | md_new_event(mddev); |
1da177e4 LT |
4442 | |
4443 | return 0; | |
4444 | busy: | |
fdefa4d8 | 4445 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4446 | bdevname(rdev->bdev,b), mdname(mddev)); |
4447 | return -EBUSY; | |
4448 | } | |
4449 | ||
4450 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4451 | { | |
4452 | char b[BDEVNAME_SIZE]; | |
4453 | int err; | |
1da177e4 LT |
4454 | mdk_rdev_t *rdev; |
4455 | ||
4456 | if (!mddev->pers) | |
4457 | return -ENODEV; | |
4458 | ||
4459 | if (mddev->major_version != 0) { | |
4460 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4461 | " version-0 superblocks.\n", | |
4462 | mdname(mddev)); | |
4463 | return -EINVAL; | |
4464 | } | |
4465 | if (!mddev->pers->hot_add_disk) { | |
4466 | printk(KERN_WARNING | |
4467 | "%s: personality does not support diskops!\n", | |
4468 | mdname(mddev)); | |
4469 | return -EINVAL; | |
4470 | } | |
4471 | ||
d710e138 | 4472 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4473 | if (IS_ERR(rdev)) { |
4474 | printk(KERN_WARNING | |
4475 | "md: error, md_import_device() returned %ld\n", | |
4476 | PTR_ERR(rdev)); | |
4477 | return -EINVAL; | |
4478 | } | |
4479 | ||
4480 | if (mddev->persistent) | |
0f420358 | 4481 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4482 | else |
0f420358 | 4483 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4484 | |
e7debaa4 | 4485 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4486 | |
b2d444d7 | 4487 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4488 | printk(KERN_WARNING |
4489 | "md: can not hot-add faulty %s disk to %s!\n", | |
4490 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4491 | err = -EINVAL; | |
4492 | goto abort_export; | |
4493 | } | |
b2d444d7 | 4494 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4495 | rdev->desc_nr = -1; |
5842730d | 4496 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4497 | err = bind_rdev_to_array(rdev, mddev); |
4498 | if (err) | |
4499 | goto abort_export; | |
1da177e4 LT |
4500 | |
4501 | /* | |
4502 | * The rest should better be atomic, we can have disk failures | |
4503 | * noticed in interrupt contexts ... | |
4504 | */ | |
4505 | ||
4506 | if (rdev->desc_nr == mddev->max_disks) { | |
4507 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4508 | mdname(mddev)); | |
4509 | err = -EBUSY; | |
4510 | goto abort_unbind_export; | |
4511 | } | |
4512 | ||
4513 | rdev->raid_disk = -1; | |
4514 | ||
850b2b42 | 4515 | md_update_sb(mddev, 1); |
1da177e4 LT |
4516 | |
4517 | /* | |
4518 | * Kick recovery, maybe this spare has to be added to the | |
4519 | * array immediately. | |
4520 | */ | |
4521 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4522 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4523 | md_new_event(mddev); |
1da177e4 LT |
4524 | return 0; |
4525 | ||
4526 | abort_unbind_export: | |
4527 | unbind_rdev_from_array(rdev); | |
4528 | ||
4529 | abort_export: | |
4530 | export_rdev(rdev); | |
4531 | return err; | |
4532 | } | |
4533 | ||
32a7627c N |
4534 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4535 | { | |
4536 | int err; | |
4537 | ||
36fa3063 N |
4538 | if (mddev->pers) { |
4539 | if (!mddev->pers->quiesce) | |
4540 | return -EBUSY; | |
4541 | if (mddev->recovery || mddev->sync_thread) | |
4542 | return -EBUSY; | |
4543 | /* we should be able to change the bitmap.. */ | |
4544 | } | |
32a7627c | 4545 | |
32a7627c | 4546 | |
36fa3063 N |
4547 | if (fd >= 0) { |
4548 | if (mddev->bitmap) | |
4549 | return -EEXIST; /* cannot add when bitmap is present */ | |
4550 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4551 | |
36fa3063 N |
4552 | if (mddev->bitmap_file == NULL) { |
4553 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4554 | mdname(mddev)); | |
4555 | return -EBADF; | |
4556 | } | |
4557 | ||
4558 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4559 | if (err) { | |
4560 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4561 | mdname(mddev)); | |
4562 | fput(mddev->bitmap_file); | |
4563 | mddev->bitmap_file = NULL; | |
4564 | return err; | |
4565 | } | |
a654b9d8 | 4566 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4567 | } else if (mddev->bitmap == NULL) |
4568 | return -ENOENT; /* cannot remove what isn't there */ | |
4569 | err = 0; | |
4570 | if (mddev->pers) { | |
4571 | mddev->pers->quiesce(mddev, 1); | |
4572 | if (fd >= 0) | |
4573 | err = bitmap_create(mddev); | |
d7375ab3 | 4574 | if (fd < 0 || err) { |
36fa3063 | 4575 | bitmap_destroy(mddev); |
d7375ab3 N |
4576 | fd = -1; /* make sure to put the file */ |
4577 | } | |
36fa3063 | 4578 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4579 | } |
4580 | if (fd < 0) { | |
acc55e22 N |
4581 | if (mddev->bitmap_file) { |
4582 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4583 | fput(mddev->bitmap_file); |
acc55e22 | 4584 | } |
36fa3063 N |
4585 | mddev->bitmap_file = NULL; |
4586 | } | |
4587 | ||
32a7627c N |
4588 | return err; |
4589 | } | |
4590 | ||
1da177e4 LT |
4591 | /* |
4592 | * set_array_info is used two different ways | |
4593 | * The original usage is when creating a new array. | |
4594 | * In this usage, raid_disks is > 0 and it together with | |
4595 | * level, size, not_persistent,layout,chunksize determine the | |
4596 | * shape of the array. | |
4597 | * This will always create an array with a type-0.90.0 superblock. | |
4598 | * The newer usage is when assembling an array. | |
4599 | * In this case raid_disks will be 0, and the major_version field is | |
4600 | * use to determine which style super-blocks are to be found on the devices. | |
4601 | * The minor and patch _version numbers are also kept incase the | |
4602 | * super_block handler wishes to interpret them. | |
4603 | */ | |
4604 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4605 | { | |
4606 | ||
4607 | if (info->raid_disks == 0) { | |
4608 | /* just setting version number for superblock loading */ | |
4609 | if (info->major_version < 0 || | |
50511da3 | 4610 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4611 | super_types[info->major_version].name == NULL) { |
4612 | /* maybe try to auto-load a module? */ | |
4613 | printk(KERN_INFO | |
4614 | "md: superblock version %d not known\n", | |
4615 | info->major_version); | |
4616 | return -EINVAL; | |
4617 | } | |
4618 | mddev->major_version = info->major_version; | |
4619 | mddev->minor_version = info->minor_version; | |
4620 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4621 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4622 | return 0; |
4623 | } | |
4624 | mddev->major_version = MD_MAJOR_VERSION; | |
4625 | mddev->minor_version = MD_MINOR_VERSION; | |
4626 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4627 | mddev->ctime = get_seconds(); | |
4628 | ||
4629 | mddev->level = info->level; | |
17115e03 | 4630 | mddev->clevel[0] = 0; |
1da177e4 LT |
4631 | mddev->size = info->size; |
4632 | mddev->raid_disks = info->raid_disks; | |
4633 | /* don't set md_minor, it is determined by which /dev/md* was | |
4634 | * openned | |
4635 | */ | |
4636 | if (info->state & (1<<MD_SB_CLEAN)) | |
4637 | mddev->recovery_cp = MaxSector; | |
4638 | else | |
4639 | mddev->recovery_cp = 0; | |
4640 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4641 | mddev->external = 0; |
1da177e4 LT |
4642 | |
4643 | mddev->layout = info->layout; | |
4644 | mddev->chunk_size = info->chunk_size; | |
4645 | ||
4646 | mddev->max_disks = MD_SB_DISKS; | |
4647 | ||
e691063a N |
4648 | if (mddev->persistent) |
4649 | mddev->flags = 0; | |
850b2b42 | 4650 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4651 | |
b2a2703c N |
4652 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4653 | mddev->bitmap_offset = 0; | |
4654 | ||
f6705578 N |
4655 | mddev->reshape_position = MaxSector; |
4656 | ||
1da177e4 LT |
4657 | /* |
4658 | * Generate a 128 bit UUID | |
4659 | */ | |
4660 | get_random_bytes(mddev->uuid, 16); | |
4661 | ||
f6705578 N |
4662 | mddev->new_level = mddev->level; |
4663 | mddev->new_chunk = mddev->chunk_size; | |
4664 | mddev->new_layout = mddev->layout; | |
4665 | mddev->delta_disks = 0; | |
4666 | ||
1da177e4 LT |
4667 | return 0; |
4668 | } | |
4669 | ||
d71f9f88 | 4670 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 4671 | { |
159ec1fc | 4672 | mdk_rdev_t *rdev; |
a35b0d69 | 4673 | int rv; |
d71f9f88 | 4674 | int fit = (num_sectors == 0); |
a35b0d69 N |
4675 | |
4676 | if (mddev->pers->resize == NULL) | |
4677 | return -EINVAL; | |
d71f9f88 AN |
4678 | /* The "num_sectors" is the number of sectors of each device that |
4679 | * is used. This can only make sense for arrays with redundancy. | |
4680 | * linear and raid0 always use whatever space is available. We can only | |
4681 | * consider changing this number if no resync or reconstruction is | |
4682 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 4683 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
4684 | * of each device. If num_sectors is zero, we find the largest size |
4685 | * that fits. | |
4686 | ||
a35b0d69 N |
4687 | */ |
4688 | if (mddev->sync_thread) | |
4689 | return -EBUSY; | |
dba034ee N |
4690 | if (mddev->bitmap) |
4691 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
4692 | * grow, and re-add. | |
4693 | */ | |
4694 | return -EBUSY; | |
159ec1fc | 4695 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
a35b0d69 | 4696 | sector_t avail; |
01ab5662 N |
4697 | avail = rdev->size * 2; |
4698 | ||
d71f9f88 AN |
4699 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
4700 | num_sectors = avail; | |
4701 | if (avail < num_sectors) | |
a35b0d69 N |
4702 | return -ENOSPC; |
4703 | } | |
d71f9f88 | 4704 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
4705 | if (!rv) { |
4706 | struct block_device *bdev; | |
4707 | ||
4708 | bdev = bdget_disk(mddev->gendisk, 0); | |
4709 | if (bdev) { | |
1b1dcc1b | 4710 | mutex_lock(&bdev->bd_inode->i_mutex); |
f233ea5c AN |
4711 | i_size_write(bdev->bd_inode, |
4712 | (loff_t)mddev->array_sectors << 9); | |
1b1dcc1b | 4713 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4714 | bdput(bdev); |
4715 | } | |
4716 | } | |
4717 | return rv; | |
4718 | } | |
4719 | ||
da943b99 N |
4720 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4721 | { | |
4722 | int rv; | |
4723 | /* change the number of raid disks */ | |
63c70c4f | 4724 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4725 | return -EINVAL; |
4726 | if (raid_disks <= 0 || | |
4727 | raid_disks >= mddev->max_disks) | |
4728 | return -EINVAL; | |
63c70c4f | 4729 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4730 | return -EBUSY; |
63c70c4f N |
4731 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4732 | ||
4733 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4734 | return rv; |
4735 | } | |
4736 | ||
4737 | ||
1da177e4 LT |
4738 | /* |
4739 | * update_array_info is used to change the configuration of an | |
4740 | * on-line array. | |
4741 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4742 | * fields in the info are checked against the array. | |
4743 | * Any differences that cannot be handled will cause an error. | |
4744 | * Normally, only one change can be managed at a time. | |
4745 | */ | |
4746 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4747 | { | |
4748 | int rv = 0; | |
4749 | int cnt = 0; | |
36fa3063 N |
4750 | int state = 0; |
4751 | ||
4752 | /* calculate expected state,ignoring low bits */ | |
4753 | if (mddev->bitmap && mddev->bitmap_offset) | |
4754 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4755 | |
4756 | if (mddev->major_version != info->major_version || | |
4757 | mddev->minor_version != info->minor_version || | |
4758 | /* mddev->patch_version != info->patch_version || */ | |
4759 | mddev->ctime != info->ctime || | |
4760 | mddev->level != info->level || | |
4761 | /* mddev->layout != info->layout || */ | |
4762 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4763 | mddev->chunk_size != info->chunk_size || |
4764 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4765 | ((state^info->state) & 0xfffffe00) | |
4766 | ) | |
1da177e4 LT |
4767 | return -EINVAL; |
4768 | /* Check there is only one change */ | |
284ae7ca | 4769 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4770 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4771 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4772 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4773 | if (cnt == 0) return 0; |
4774 | if (cnt > 1) return -EINVAL; | |
4775 | ||
4776 | if (mddev->layout != info->layout) { | |
4777 | /* Change layout | |
4778 | * we don't need to do anything at the md level, the | |
4779 | * personality will take care of it all. | |
4780 | */ | |
4781 | if (mddev->pers->reconfig == NULL) | |
4782 | return -EINVAL; | |
4783 | else | |
4784 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4785 | } | |
284ae7ca | 4786 | if (info->size >= 0 && mddev->size != info->size) |
d71f9f88 | 4787 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 4788 | |
da943b99 N |
4789 | if (mddev->raid_disks != info->raid_disks) |
4790 | rv = update_raid_disks(mddev, info->raid_disks); | |
4791 | ||
36fa3063 N |
4792 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4793 | if (mddev->pers->quiesce == NULL) | |
4794 | return -EINVAL; | |
4795 | if (mddev->recovery || mddev->sync_thread) | |
4796 | return -EBUSY; | |
4797 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4798 | /* add the bitmap */ | |
4799 | if (mddev->bitmap) | |
4800 | return -EEXIST; | |
4801 | if (mddev->default_bitmap_offset == 0) | |
4802 | return -EINVAL; | |
4803 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4804 | mddev->pers->quiesce(mddev, 1); | |
4805 | rv = bitmap_create(mddev); | |
4806 | if (rv) | |
4807 | bitmap_destroy(mddev); | |
4808 | mddev->pers->quiesce(mddev, 0); | |
4809 | } else { | |
4810 | /* remove the bitmap */ | |
4811 | if (!mddev->bitmap) | |
4812 | return -ENOENT; | |
4813 | if (mddev->bitmap->file) | |
4814 | return -EINVAL; | |
4815 | mddev->pers->quiesce(mddev, 1); | |
4816 | bitmap_destroy(mddev); | |
4817 | mddev->pers->quiesce(mddev, 0); | |
4818 | mddev->bitmap_offset = 0; | |
4819 | } | |
4820 | } | |
850b2b42 | 4821 | md_update_sb(mddev, 1); |
1da177e4 LT |
4822 | return rv; |
4823 | } | |
4824 | ||
4825 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4826 | { | |
4827 | mdk_rdev_t *rdev; | |
4828 | ||
4829 | if (mddev->pers == NULL) | |
4830 | return -ENODEV; | |
4831 | ||
4832 | rdev = find_rdev(mddev, dev); | |
4833 | if (!rdev) | |
4834 | return -ENODEV; | |
4835 | ||
4836 | md_error(mddev, rdev); | |
4837 | return 0; | |
4838 | } | |
4839 | ||
2f9618ce AN |
4840 | /* |
4841 | * We have a problem here : there is no easy way to give a CHS | |
4842 | * virtual geometry. We currently pretend that we have a 2 heads | |
4843 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4844 | * dosfs just mad... ;-) | |
4845 | */ | |
a885c8c4 CH |
4846 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4847 | { | |
4848 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4849 | ||
4850 | geo->heads = 2; | |
4851 | geo->sectors = 4; | |
4852 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4853 | return 0; | |
4854 | } | |
4855 | ||
a39907fa | 4856 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
4857 | unsigned int cmd, unsigned long arg) |
4858 | { | |
4859 | int err = 0; | |
4860 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4861 | mddev_t *mddev = NULL; |
4862 | ||
4863 | if (!capable(CAP_SYS_ADMIN)) | |
4864 | return -EACCES; | |
4865 | ||
4866 | /* | |
4867 | * Commands dealing with the RAID driver but not any | |
4868 | * particular array: | |
4869 | */ | |
4870 | switch (cmd) | |
4871 | { | |
4872 | case RAID_VERSION: | |
4873 | err = get_version(argp); | |
4874 | goto done; | |
4875 | ||
4876 | case PRINT_RAID_DEBUG: | |
4877 | err = 0; | |
4878 | md_print_devices(); | |
4879 | goto done; | |
4880 | ||
4881 | #ifndef MODULE | |
4882 | case RAID_AUTORUN: | |
4883 | err = 0; | |
4884 | autostart_arrays(arg); | |
4885 | goto done; | |
4886 | #endif | |
4887 | default:; | |
4888 | } | |
4889 | ||
4890 | /* | |
4891 | * Commands creating/starting a new array: | |
4892 | */ | |
4893 | ||
a39907fa | 4894 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
4895 | |
4896 | if (!mddev) { | |
4897 | BUG(); | |
4898 | goto abort; | |
4899 | } | |
4900 | ||
1da177e4 LT |
4901 | err = mddev_lock(mddev); |
4902 | if (err) { | |
4903 | printk(KERN_INFO | |
4904 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4905 | err, cmd); | |
4906 | goto abort; | |
4907 | } | |
4908 | ||
4909 | switch (cmd) | |
4910 | { | |
4911 | case SET_ARRAY_INFO: | |
4912 | { | |
4913 | mdu_array_info_t info; | |
4914 | if (!arg) | |
4915 | memset(&info, 0, sizeof(info)); | |
4916 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4917 | err = -EFAULT; | |
4918 | goto abort_unlock; | |
4919 | } | |
4920 | if (mddev->pers) { | |
4921 | err = update_array_info(mddev, &info); | |
4922 | if (err) { | |
4923 | printk(KERN_WARNING "md: couldn't update" | |
4924 | " array info. %d\n", err); | |
4925 | goto abort_unlock; | |
4926 | } | |
4927 | goto done_unlock; | |
4928 | } | |
4929 | if (!list_empty(&mddev->disks)) { | |
4930 | printk(KERN_WARNING | |
4931 | "md: array %s already has disks!\n", | |
4932 | mdname(mddev)); | |
4933 | err = -EBUSY; | |
4934 | goto abort_unlock; | |
4935 | } | |
4936 | if (mddev->raid_disks) { | |
4937 | printk(KERN_WARNING | |
4938 | "md: array %s already initialised!\n", | |
4939 | mdname(mddev)); | |
4940 | err = -EBUSY; | |
4941 | goto abort_unlock; | |
4942 | } | |
4943 | err = set_array_info(mddev, &info); | |
4944 | if (err) { | |
4945 | printk(KERN_WARNING "md: couldn't set" | |
4946 | " array info. %d\n", err); | |
4947 | goto abort_unlock; | |
4948 | } | |
4949 | } | |
4950 | goto done_unlock; | |
4951 | ||
4952 | default:; | |
4953 | } | |
4954 | ||
4955 | /* | |
4956 | * Commands querying/configuring an existing array: | |
4957 | */ | |
32a7627c | 4958 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 4959 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
4960 | if ((!mddev->raid_disks && !mddev->external) |
4961 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
4962 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
4963 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
4964 | err = -ENODEV; |
4965 | goto abort_unlock; | |
4966 | } | |
4967 | ||
4968 | /* | |
4969 | * Commands even a read-only array can execute: | |
4970 | */ | |
4971 | switch (cmd) | |
4972 | { | |
4973 | case GET_ARRAY_INFO: | |
4974 | err = get_array_info(mddev, argp); | |
4975 | goto done_unlock; | |
4976 | ||
32a7627c | 4977 | case GET_BITMAP_FILE: |
87162a28 | 4978 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
4979 | goto done_unlock; |
4980 | ||
1da177e4 LT |
4981 | case GET_DISK_INFO: |
4982 | err = get_disk_info(mddev, argp); | |
4983 | goto done_unlock; | |
4984 | ||
4985 | case RESTART_ARRAY_RW: | |
4986 | err = restart_array(mddev); | |
4987 | goto done_unlock; | |
4988 | ||
4989 | case STOP_ARRAY: | |
d710e138 | 4990 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
4991 | goto done_unlock; |
4992 | ||
4993 | case STOP_ARRAY_RO: | |
d710e138 | 4994 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
4995 | goto done_unlock; |
4996 | ||
1da177e4 LT |
4997 | } |
4998 | ||
4999 | /* | |
5000 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5001 | * superblock, so we do not allow them on read-only arrays. |
5002 | * However non-MD ioctls (e.g. get-size) will still come through | |
5003 | * here and hit the 'default' below, so only disallow | |
5004 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5005 | */ |
bb57fc64 | 5006 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5007 | if (mddev->ro == 2) { |
5008 | mddev->ro = 0; | |
b62b7590 | 5009 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5010 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5011 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5012 | } else { |
5013 | err = -EROFS; | |
5014 | goto abort_unlock; | |
5015 | } | |
1da177e4 LT |
5016 | } |
5017 | ||
5018 | switch (cmd) | |
5019 | { | |
5020 | case ADD_NEW_DISK: | |
5021 | { | |
5022 | mdu_disk_info_t info; | |
5023 | if (copy_from_user(&info, argp, sizeof(info))) | |
5024 | err = -EFAULT; | |
5025 | else | |
5026 | err = add_new_disk(mddev, &info); | |
5027 | goto done_unlock; | |
5028 | } | |
5029 | ||
5030 | case HOT_REMOVE_DISK: | |
5031 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5032 | goto done_unlock; | |
5033 | ||
5034 | case HOT_ADD_DISK: | |
5035 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5036 | goto done_unlock; | |
5037 | ||
5038 | case SET_DISK_FAULTY: | |
5039 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5040 | goto done_unlock; | |
5041 | ||
5042 | case RUN_ARRAY: | |
d710e138 | 5043 | err = do_md_run(mddev); |
1da177e4 LT |
5044 | goto done_unlock; |
5045 | ||
32a7627c N |
5046 | case SET_BITMAP_FILE: |
5047 | err = set_bitmap_file(mddev, (int)arg); | |
5048 | goto done_unlock; | |
5049 | ||
1da177e4 | 5050 | default: |
1da177e4 LT |
5051 | err = -EINVAL; |
5052 | goto abort_unlock; | |
5053 | } | |
5054 | ||
5055 | done_unlock: | |
5056 | abort_unlock: | |
5057 | mddev_unlock(mddev); | |
5058 | ||
5059 | return err; | |
5060 | done: | |
5061 | if (err) | |
5062 | MD_BUG(); | |
5063 | abort: | |
5064 | return err; | |
5065 | } | |
5066 | ||
a39907fa | 5067 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5068 | { |
5069 | /* | |
5070 | * Succeed if we can lock the mddev, which confirms that | |
5071 | * it isn't being stopped right now. | |
5072 | */ | |
a39907fa | 5073 | mddev_t *mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5074 | int err; |
5075 | ||
d63a5a74 | 5076 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5077 | goto out; |
5078 | ||
5079 | err = 0; | |
5080 | mddev_get(mddev); | |
f2ea68cf | 5081 | atomic_inc(&mddev->openers); |
1da177e4 LT |
5082 | mddev_unlock(mddev); |
5083 | ||
a39907fa | 5084 | check_disk_change(bdev); |
1da177e4 LT |
5085 | out: |
5086 | return err; | |
5087 | } | |
5088 | ||
a39907fa | 5089 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5090 | { |
a39907fa | 5091 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5092 | |
52e5f9d1 | 5093 | BUG_ON(!mddev); |
f2ea68cf | 5094 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5095 | mddev_put(mddev); |
5096 | ||
5097 | return 0; | |
5098 | } | |
5099 | ||
44ce6294 LT |
5100 | static int md_media_changed(struct gendisk *disk) |
5101 | { | |
5102 | mddev_t *mddev = disk->private_data; | |
5103 | ||
5104 | return mddev->changed; | |
5105 | } | |
5106 | ||
5107 | static int md_revalidate(struct gendisk *disk) | |
5108 | { | |
5109 | mddev_t *mddev = disk->private_data; | |
5110 | ||
5111 | mddev->changed = 0; | |
5112 | return 0; | |
5113 | } | |
1da177e4 LT |
5114 | static struct block_device_operations md_fops = |
5115 | { | |
5116 | .owner = THIS_MODULE, | |
a39907fa AV |
5117 | .open = md_open, |
5118 | .release = md_release, | |
5119 | .locked_ioctl = md_ioctl, | |
a885c8c4 | 5120 | .getgeo = md_getgeo, |
44ce6294 LT |
5121 | .media_changed = md_media_changed, |
5122 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5123 | }; |
5124 | ||
75c96f85 | 5125 | static int md_thread(void * arg) |
1da177e4 LT |
5126 | { |
5127 | mdk_thread_t *thread = arg; | |
5128 | ||
1da177e4 LT |
5129 | /* |
5130 | * md_thread is a 'system-thread', it's priority should be very | |
5131 | * high. We avoid resource deadlocks individually in each | |
5132 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5133 | * the very same RT priority as kswapd, thus we will never get | |
5134 | * into a priority inversion deadlock. | |
5135 | * | |
5136 | * we definitely have to have equal or higher priority than | |
5137 | * bdflush, otherwise bdflush will deadlock if there are too | |
5138 | * many dirty RAID5 blocks. | |
5139 | */ | |
1da177e4 | 5140 | |
6985c43f | 5141 | allow_signal(SIGKILL); |
a6fb0934 | 5142 | while (!kthread_should_stop()) { |
1da177e4 | 5143 | |
93588e22 N |
5144 | /* We need to wait INTERRUPTIBLE so that |
5145 | * we don't add to the load-average. | |
5146 | * That means we need to be sure no signals are | |
5147 | * pending | |
5148 | */ | |
5149 | if (signal_pending(current)) | |
5150 | flush_signals(current); | |
5151 | ||
5152 | wait_event_interruptible_timeout | |
5153 | (thread->wqueue, | |
5154 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5155 | || kthread_should_stop(), | |
5156 | thread->timeout); | |
1da177e4 LT |
5157 | |
5158 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5159 | ||
787453c2 | 5160 | thread->run(thread->mddev); |
1da177e4 | 5161 | } |
a6fb0934 | 5162 | |
1da177e4 LT |
5163 | return 0; |
5164 | } | |
5165 | ||
5166 | void md_wakeup_thread(mdk_thread_t *thread) | |
5167 | { | |
5168 | if (thread) { | |
5169 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5170 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5171 | wake_up(&thread->wqueue); | |
5172 | } | |
5173 | } | |
5174 | ||
5175 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5176 | const char *name) | |
5177 | { | |
5178 | mdk_thread_t *thread; | |
1da177e4 | 5179 | |
9ffae0cf | 5180 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5181 | if (!thread) |
5182 | return NULL; | |
5183 | ||
1da177e4 LT |
5184 | init_waitqueue_head(&thread->wqueue); |
5185 | ||
1da177e4 LT |
5186 | thread->run = run; |
5187 | thread->mddev = mddev; | |
32a7627c | 5188 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5189 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5190 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5191 | kfree(thread); |
5192 | return NULL; | |
5193 | } | |
1da177e4 LT |
5194 | return thread; |
5195 | } | |
5196 | ||
1da177e4 LT |
5197 | void md_unregister_thread(mdk_thread_t *thread) |
5198 | { | |
ba25f9dc | 5199 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5200 | |
5201 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5202 | kfree(thread); |
5203 | } | |
5204 | ||
5205 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5206 | { | |
5207 | if (!mddev) { | |
5208 | MD_BUG(); | |
5209 | return; | |
5210 | } | |
5211 | ||
b2d444d7 | 5212 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5213 | return; |
6bfe0b49 DW |
5214 | |
5215 | if (mddev->external) | |
5216 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5217 | /* |
1da177e4 LT |
5218 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5219 | mdname(mddev), | |
5220 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5221 | __builtin_return_address(0),__builtin_return_address(1), | |
5222 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5223 | */ |
d0a0a5ee AM |
5224 | if (!mddev->pers) |
5225 | return; | |
1da177e4 LT |
5226 | if (!mddev->pers->error_handler) |
5227 | return; | |
5228 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5229 | if (mddev->degraded) |
5230 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5231 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5232 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5233 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5234 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5235 | md_new_event_inintr(mddev); |
1da177e4 LT |
5236 | } |
5237 | ||
5238 | /* seq_file implementation /proc/mdstat */ | |
5239 | ||
5240 | static void status_unused(struct seq_file *seq) | |
5241 | { | |
5242 | int i = 0; | |
5243 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5244 | |
5245 | seq_printf(seq, "unused devices: "); | |
5246 | ||
159ec1fc | 5247 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5248 | char b[BDEVNAME_SIZE]; |
5249 | i++; | |
5250 | seq_printf(seq, "%s ", | |
5251 | bdevname(rdev->bdev,b)); | |
5252 | } | |
5253 | if (!i) | |
5254 | seq_printf(seq, "<none>"); | |
5255 | ||
5256 | seq_printf(seq, "\n"); | |
5257 | } | |
5258 | ||
5259 | ||
5260 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5261 | { | |
4588b42e N |
5262 | sector_t max_blocks, resync, res; |
5263 | unsigned long dt, db, rt; | |
5264 | int scale; | |
5265 | unsigned int per_milli; | |
1da177e4 LT |
5266 | |
5267 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
5268 | ||
5269 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5270 | max_blocks = mddev->resync_max_sectors >> 1; | |
5271 | else | |
5272 | max_blocks = mddev->size; | |
5273 | ||
5274 | /* | |
5275 | * Should not happen. | |
5276 | */ | |
5277 | if (!max_blocks) { | |
5278 | MD_BUG(); | |
5279 | return; | |
5280 | } | |
4588b42e N |
5281 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
5282 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
5283 | * u32, as those are the requirements for sector_div. | |
5284 | * Thus 'scale' must be at least 10 | |
5285 | */ | |
5286 | scale = 10; | |
5287 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5288 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
5289 | scale++; | |
5290 | } | |
5291 | res = (resync>>scale)*1000; | |
5292 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
5293 | ||
5294 | per_milli = res; | |
1da177e4 | 5295 | { |
4588b42e | 5296 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5297 | seq_printf(seq, "["); |
5298 | for (i = 0; i < x; i++) | |
5299 | seq_printf(seq, "="); | |
5300 | seq_printf(seq, ">"); | |
5301 | for (i = 0; i < y; i++) | |
5302 | seq_printf(seq, "."); | |
5303 | seq_printf(seq, "] "); | |
5304 | } | |
4588b42e | 5305 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5306 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5307 | "reshape" : | |
61df9d91 N |
5308 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5309 | "check" : | |
5310 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5311 | "resync" : "recovery"))), | |
5312 | per_milli/10, per_milli % 10, | |
4588b42e N |
5313 | (unsigned long long) resync, |
5314 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5315 | |
5316 | /* | |
5317 | * We do not want to overflow, so the order of operands and | |
5318 | * the * 100 / 100 trick are important. We do a +1 to be | |
5319 | * safe against division by zero. We only estimate anyway. | |
5320 | * | |
5321 | * dt: time from mark until now | |
5322 | * db: blocks written from mark until now | |
5323 | * rt: remaining time | |
5324 | */ | |
5325 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5326 | if (!dt) dt++; | |
ff4e8d9a N |
5327 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5328 | - mddev->resync_mark_cnt; | |
5329 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5330 | |
5331 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5332 | ||
ff4e8d9a | 5333 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5334 | } |
5335 | ||
5336 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5337 | { | |
5338 | struct list_head *tmp; | |
5339 | loff_t l = *pos; | |
5340 | mddev_t *mddev; | |
5341 | ||
5342 | if (l >= 0x10000) | |
5343 | return NULL; | |
5344 | if (!l--) | |
5345 | /* header */ | |
5346 | return (void*)1; | |
5347 | ||
5348 | spin_lock(&all_mddevs_lock); | |
5349 | list_for_each(tmp,&all_mddevs) | |
5350 | if (!l--) { | |
5351 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5352 | mddev_get(mddev); | |
5353 | spin_unlock(&all_mddevs_lock); | |
5354 | return mddev; | |
5355 | } | |
5356 | spin_unlock(&all_mddevs_lock); | |
5357 | if (!l--) | |
5358 | return (void*)2;/* tail */ | |
5359 | return NULL; | |
5360 | } | |
5361 | ||
5362 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5363 | { | |
5364 | struct list_head *tmp; | |
5365 | mddev_t *next_mddev, *mddev = v; | |
5366 | ||
5367 | ++*pos; | |
5368 | if (v == (void*)2) | |
5369 | return NULL; | |
5370 | ||
5371 | spin_lock(&all_mddevs_lock); | |
5372 | if (v == (void*)1) | |
5373 | tmp = all_mddevs.next; | |
5374 | else | |
5375 | tmp = mddev->all_mddevs.next; | |
5376 | if (tmp != &all_mddevs) | |
5377 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5378 | else { | |
5379 | next_mddev = (void*)2; | |
5380 | *pos = 0x10000; | |
5381 | } | |
5382 | spin_unlock(&all_mddevs_lock); | |
5383 | ||
5384 | if (v != (void*)1) | |
5385 | mddev_put(mddev); | |
5386 | return next_mddev; | |
5387 | ||
5388 | } | |
5389 | ||
5390 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5391 | { | |
5392 | mddev_t *mddev = v; | |
5393 | ||
5394 | if (mddev && v != (void*)1 && v != (void*)2) | |
5395 | mddev_put(mddev); | |
5396 | } | |
5397 | ||
d7603b7e N |
5398 | struct mdstat_info { |
5399 | int event; | |
5400 | }; | |
5401 | ||
1da177e4 LT |
5402 | static int md_seq_show(struct seq_file *seq, void *v) |
5403 | { | |
5404 | mddev_t *mddev = v; | |
5405 | sector_t size; | |
1da177e4 | 5406 | mdk_rdev_t *rdev; |
d7603b7e | 5407 | struct mdstat_info *mi = seq->private; |
32a7627c | 5408 | struct bitmap *bitmap; |
1da177e4 LT |
5409 | |
5410 | if (v == (void*)1) { | |
2604b703 | 5411 | struct mdk_personality *pers; |
1da177e4 LT |
5412 | seq_printf(seq, "Personalities : "); |
5413 | spin_lock(&pers_lock); | |
2604b703 N |
5414 | list_for_each_entry(pers, &pers_list, list) |
5415 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5416 | |
5417 | spin_unlock(&pers_lock); | |
5418 | seq_printf(seq, "\n"); | |
d7603b7e | 5419 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5420 | return 0; |
5421 | } | |
5422 | if (v == (void*)2) { | |
5423 | status_unused(seq); | |
5424 | return 0; | |
5425 | } | |
5426 | ||
5dc5cf7d | 5427 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5428 | return -EINTR; |
5dc5cf7d | 5429 | |
1da177e4 LT |
5430 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5431 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5432 | mddev->pers ? "" : "in"); | |
5433 | if (mddev->pers) { | |
f91de92e | 5434 | if (mddev->ro==1) |
1da177e4 | 5435 | seq_printf(seq, " (read-only)"); |
f91de92e | 5436 | if (mddev->ro==2) |
52720ae7 | 5437 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5438 | seq_printf(seq, " %s", mddev->pers->name); |
5439 | } | |
5440 | ||
5441 | size = 0; | |
159ec1fc | 5442 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5443 | char b[BDEVNAME_SIZE]; |
5444 | seq_printf(seq, " %s[%d]", | |
5445 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5446 | if (test_bit(WriteMostly, &rdev->flags)) |
5447 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5448 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5449 | seq_printf(seq, "(F)"); |
5450 | continue; | |
b325a32e N |
5451 | } else if (rdev->raid_disk < 0) |
5452 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
5453 | size += rdev->size; |
5454 | } | |
5455 | ||
5456 | if (!list_empty(&mddev->disks)) { | |
5457 | if (mddev->pers) | |
5458 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
5459 | (unsigned long long) |
5460 | mddev->array_sectors / 2); | |
1da177e4 LT |
5461 | else |
5462 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c | 5463 | (unsigned long long)size); |
1da177e4 | 5464 | } |
1cd6bf19 N |
5465 | if (mddev->persistent) { |
5466 | if (mddev->major_version != 0 || | |
5467 | mddev->minor_version != 90) { | |
5468 | seq_printf(seq," super %d.%d", | |
5469 | mddev->major_version, | |
5470 | mddev->minor_version); | |
5471 | } | |
e691063a N |
5472 | } else if (mddev->external) |
5473 | seq_printf(seq, " super external:%s", | |
5474 | mddev->metadata_type); | |
5475 | else | |
1cd6bf19 | 5476 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5477 | |
5478 | if (mddev->pers) { | |
d710e138 | 5479 | mddev->pers->status(seq, mddev); |
1da177e4 | 5480 | seq_printf(seq, "\n "); |
8e1b39d6 N |
5481 | if (mddev->pers->sync_request) { |
5482 | if (mddev->curr_resync > 2) { | |
d710e138 | 5483 | status_resync(seq, mddev); |
8e1b39d6 N |
5484 | seq_printf(seq, "\n "); |
5485 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5486 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5487 | else if (mddev->recovery_cp < MaxSector) | |
5488 | seq_printf(seq, "\tresync=PENDING\n "); | |
5489 | } | |
32a7627c N |
5490 | } else |
5491 | seq_printf(seq, "\n "); | |
5492 | ||
5493 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5494 | unsigned long chunk_kb; |
5495 | unsigned long flags; | |
32a7627c N |
5496 | spin_lock_irqsave(&bitmap->lock, flags); |
5497 | chunk_kb = bitmap->chunksize >> 10; | |
5498 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5499 | "%lu%s chunk", | |
5500 | bitmap->pages - bitmap->missing_pages, | |
5501 | bitmap->pages, | |
5502 | (bitmap->pages - bitmap->missing_pages) | |
5503 | << (PAGE_SHIFT - 10), | |
5504 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5505 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5506 | if (bitmap->file) { |
5507 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5508 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5509 | } |
78d742d8 | 5510 | |
32a7627c N |
5511 | seq_printf(seq, "\n"); |
5512 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5513 | } |
5514 | ||
5515 | seq_printf(seq, "\n"); | |
5516 | } | |
5517 | mddev_unlock(mddev); | |
5518 | ||
5519 | return 0; | |
5520 | } | |
5521 | ||
5522 | static struct seq_operations md_seq_ops = { | |
5523 | .start = md_seq_start, | |
5524 | .next = md_seq_next, | |
5525 | .stop = md_seq_stop, | |
5526 | .show = md_seq_show, | |
5527 | }; | |
5528 | ||
5529 | static int md_seq_open(struct inode *inode, struct file *file) | |
5530 | { | |
5531 | int error; | |
d7603b7e N |
5532 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5533 | if (mi == NULL) | |
5534 | return -ENOMEM; | |
1da177e4 LT |
5535 | |
5536 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5537 | if (error) |
5538 | kfree(mi); | |
5539 | else { | |
5540 | struct seq_file *p = file->private_data; | |
5541 | p->private = mi; | |
5542 | mi->event = atomic_read(&md_event_count); | |
5543 | } | |
1da177e4 LT |
5544 | return error; |
5545 | } | |
5546 | ||
d7603b7e N |
5547 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5548 | { | |
5549 | struct seq_file *m = filp->private_data; | |
5550 | struct mdstat_info *mi = m->private; | |
5551 | int mask; | |
5552 | ||
5553 | poll_wait(filp, &md_event_waiters, wait); | |
5554 | ||
5555 | /* always allow read */ | |
5556 | mask = POLLIN | POLLRDNORM; | |
5557 | ||
5558 | if (mi->event != atomic_read(&md_event_count)) | |
5559 | mask |= POLLERR | POLLPRI; | |
5560 | return mask; | |
5561 | } | |
5562 | ||
fa027c2a | 5563 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5564 | .owner = THIS_MODULE, |
1da177e4 LT |
5565 | .open = md_seq_open, |
5566 | .read = seq_read, | |
5567 | .llseek = seq_lseek, | |
c3f94b40 | 5568 | .release = seq_release_private, |
d7603b7e | 5569 | .poll = mdstat_poll, |
1da177e4 LT |
5570 | }; |
5571 | ||
2604b703 | 5572 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5573 | { |
1da177e4 | 5574 | spin_lock(&pers_lock); |
2604b703 N |
5575 | list_add_tail(&p->list, &pers_list); |
5576 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5577 | spin_unlock(&pers_lock); |
5578 | return 0; | |
5579 | } | |
5580 | ||
2604b703 | 5581 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5582 | { |
2604b703 | 5583 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5584 | spin_lock(&pers_lock); |
2604b703 | 5585 | list_del_init(&p->list); |
1da177e4 LT |
5586 | spin_unlock(&pers_lock); |
5587 | return 0; | |
5588 | } | |
5589 | ||
5590 | static int is_mddev_idle(mddev_t *mddev) | |
5591 | { | |
5592 | mdk_rdev_t * rdev; | |
1da177e4 | 5593 | int idle; |
713f6ab1 | 5594 | long curr_events; |
1da177e4 LT |
5595 | |
5596 | idle = 1; | |
4b80991c N |
5597 | rcu_read_lock(); |
5598 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5599 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
074a7aca TH |
5600 | curr_events = part_stat_read(&disk->part0, sectors[0]) + |
5601 | part_stat_read(&disk->part0, sectors[1]) - | |
1da177e4 | 5602 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5603 | /* sync IO will cause sync_io to increase before the disk_stats |
5604 | * as sync_io is counted when a request starts, and | |
5605 | * disk_stats is counted when it completes. | |
5606 | * So resync activity will cause curr_events to be smaller than | |
5607 | * when there was no such activity. | |
5608 | * non-sync IO will cause disk_stat to increase without | |
5609 | * increasing sync_io so curr_events will (eventually) | |
5610 | * be larger than it was before. Once it becomes | |
5611 | * substantially larger, the test below will cause | |
5612 | * the array to appear non-idle, and resync will slow | |
5613 | * down. | |
5614 | * If there is a lot of outstanding resync activity when | |
5615 | * we set last_event to curr_events, then all that activity | |
5616 | * completing might cause the array to appear non-idle | |
5617 | * and resync will be slowed down even though there might | |
5618 | * not have been non-resync activity. This will only | |
5619 | * happen once though. 'last_events' will soon reflect | |
5620 | * the state where there is little or no outstanding | |
5621 | * resync requests, and further resync activity will | |
5622 | * always make curr_events less than last_events. | |
c0e48521 | 5623 | * |
1da177e4 | 5624 | */ |
713f6ab1 | 5625 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5626 | rdev->last_events = curr_events; |
5627 | idle = 0; | |
5628 | } | |
5629 | } | |
4b80991c | 5630 | rcu_read_unlock(); |
1da177e4 LT |
5631 | return idle; |
5632 | } | |
5633 | ||
5634 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5635 | { | |
5636 | /* another "blocks" (512byte) blocks have been synced */ | |
5637 | atomic_sub(blocks, &mddev->recovery_active); | |
5638 | wake_up(&mddev->recovery_wait); | |
5639 | if (!ok) { | |
dfc70645 | 5640 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5641 | md_wakeup_thread(mddev->thread); |
5642 | // stop recovery, signal do_sync .... | |
5643 | } | |
5644 | } | |
5645 | ||
5646 | ||
06d91a5f N |
5647 | /* md_write_start(mddev, bi) |
5648 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5649 | * in superblock) before writing, schedule a superblock update |
5650 | * and wait for it to complete. | |
06d91a5f | 5651 | */ |
3d310eb7 | 5652 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5653 | { |
0fd62b86 | 5654 | int did_change = 0; |
06d91a5f | 5655 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5656 | return; |
06d91a5f | 5657 | |
f91de92e N |
5658 | BUG_ON(mddev->ro == 1); |
5659 | if (mddev->ro == 2) { | |
5660 | /* need to switch to read/write */ | |
5661 | mddev->ro = 0; | |
5662 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5663 | md_wakeup_thread(mddev->thread); | |
25156198 | 5664 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 5665 | did_change = 1; |
f91de92e | 5666 | } |
06d91a5f | 5667 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
5668 | if (mddev->safemode == 1) |
5669 | mddev->safemode = 0; | |
06d91a5f | 5670 | if (mddev->in_sync) { |
a9701a30 | 5671 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5672 | if (mddev->in_sync) { |
5673 | mddev->in_sync = 0; | |
850b2b42 | 5674 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 5675 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 5676 | did_change = 1; |
3d310eb7 | 5677 | } |
a9701a30 | 5678 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5679 | } |
0fd62b86 | 5680 | if (did_change) |
b62b7590 | 5681 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
5682 | wait_event(mddev->sb_wait, |
5683 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
5684 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
5685 | } |
5686 | ||
5687 | void md_write_end(mddev_t *mddev) | |
5688 | { | |
5689 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5690 | if (mddev->safemode == 2) | |
5691 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5692 | else if (mddev->safemode_delay) |
1da177e4 LT |
5693 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5694 | } | |
5695 | } | |
5696 | ||
2a2275d6 N |
5697 | /* md_allow_write(mddev) |
5698 | * Calling this ensures that the array is marked 'active' so that writes | |
5699 | * may proceed without blocking. It is important to call this before | |
5700 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5701 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
5702 | * |
5703 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
5704 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 5705 | */ |
b5470dc5 | 5706 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
5707 | { |
5708 | if (!mddev->pers) | |
b5470dc5 | 5709 | return 0; |
2a2275d6 | 5710 | if (mddev->ro) |
b5470dc5 | 5711 | return 0; |
1a0fd497 | 5712 | if (!mddev->pers->sync_request) |
b5470dc5 | 5713 | return 0; |
2a2275d6 N |
5714 | |
5715 | spin_lock_irq(&mddev->write_lock); | |
5716 | if (mddev->in_sync) { | |
5717 | mddev->in_sync = 0; | |
5718 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5719 | if (mddev->safemode_delay && | |
5720 | mddev->safemode == 0) | |
5721 | mddev->safemode = 1; | |
5722 | spin_unlock_irq(&mddev->write_lock); | |
5723 | md_update_sb(mddev, 0); | |
b62b7590 | 5724 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
5725 | } else |
5726 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
5727 | |
5728 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
5729 | return -EAGAIN; | |
5730 | else | |
5731 | return 0; | |
2a2275d6 N |
5732 | } |
5733 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5734 | ||
1da177e4 LT |
5735 | #define SYNC_MARKS 10 |
5736 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5737 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5738 | { |
5739 | mddev_t *mddev2; | |
5740 | unsigned int currspeed = 0, | |
5741 | window; | |
57afd89f | 5742 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5743 | unsigned long mark[SYNC_MARKS]; |
5744 | sector_t mark_cnt[SYNC_MARKS]; | |
5745 | int last_mark,m; | |
5746 | struct list_head *tmp; | |
5747 | sector_t last_check; | |
57afd89f | 5748 | int skipped = 0; |
5fd6c1dc | 5749 | mdk_rdev_t *rdev; |
61df9d91 | 5750 | char *desc; |
1da177e4 LT |
5751 | |
5752 | /* just incase thread restarts... */ | |
5753 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5754 | return; | |
5fd6c1dc N |
5755 | if (mddev->ro) /* never try to sync a read-only array */ |
5756 | return; | |
1da177e4 | 5757 | |
61df9d91 N |
5758 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5759 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5760 | desc = "data-check"; | |
5761 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5762 | desc = "requested-resync"; | |
5763 | else | |
5764 | desc = "resync"; | |
5765 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5766 | desc = "reshape"; | |
5767 | else | |
5768 | desc = "recovery"; | |
5769 | ||
1da177e4 LT |
5770 | /* we overload curr_resync somewhat here. |
5771 | * 0 == not engaged in resync at all | |
5772 | * 2 == checking that there is no conflict with another sync | |
5773 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5774 | * commense | |
5775 | * other == active in resync - this many blocks | |
5776 | * | |
5777 | * Before starting a resync we must have set curr_resync to | |
5778 | * 2, and then checked that every "conflicting" array has curr_resync | |
5779 | * less than ours. When we find one that is the same or higher | |
5780 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5781 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5782 | * This will mean we have to start checking from the beginning again. | |
5783 | * | |
5784 | */ | |
5785 | ||
5786 | do { | |
5787 | mddev->curr_resync = 2; | |
5788 | ||
5789 | try_again: | |
787453c2 | 5790 | if (kthread_should_stop()) { |
6985c43f | 5791 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5792 | goto skip; |
5793 | } | |
29ac4aa3 | 5794 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
5795 | if (mddev2 == mddev) |
5796 | continue; | |
90b08710 BS |
5797 | if (!mddev->parallel_resync |
5798 | && mddev2->curr_resync | |
5799 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
5800 | DEFINE_WAIT(wq); |
5801 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5802 | /* arbitrarily yield */ | |
5803 | mddev->curr_resync = 1; | |
5804 | wake_up(&resync_wait); | |
5805 | } | |
5806 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5807 | /* no need to wait here, we can wait the next | |
5808 | * time 'round when curr_resync == 2 | |
5809 | */ | |
5810 | continue; | |
9744197c N |
5811 | /* We need to wait 'interruptible' so as not to |
5812 | * contribute to the load average, and not to | |
5813 | * be caught by 'softlockup' | |
5814 | */ | |
5815 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 5816 | if (!kthread_should_stop() && |
8712e553 | 5817 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5818 | printk(KERN_INFO "md: delaying %s of %s" |
5819 | " until %s has finished (they" | |
1da177e4 | 5820 | " share one or more physical units)\n", |
61df9d91 | 5821 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 5822 | mddev_put(mddev2); |
9744197c N |
5823 | if (signal_pending(current)) |
5824 | flush_signals(current); | |
1da177e4 LT |
5825 | schedule(); |
5826 | finish_wait(&resync_wait, &wq); | |
5827 | goto try_again; | |
5828 | } | |
5829 | finish_wait(&resync_wait, &wq); | |
5830 | } | |
5831 | } | |
5832 | } while (mddev->curr_resync < 2); | |
5833 | ||
5fd6c1dc | 5834 | j = 0; |
9d88883e | 5835 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5836 | /* resync follows the size requested by the personality, |
57afd89f | 5837 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5838 | */ |
5839 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5840 | mddev->resync_mismatches = 0; |
5fd6c1dc | 5841 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
5842 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
5843 | j = mddev->resync_min; | |
5844 | else if (!mddev->bitmap) | |
5fd6c1dc | 5845 | j = mddev->recovery_cp; |
5e96ee65 | 5846 | |
ccfcc3c1 N |
5847 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5848 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5849 | else { |
1da177e4 LT |
5850 | /* recovery follows the physical size of devices */ |
5851 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5852 | j = MaxSector; |
159ec1fc | 5853 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
5854 | if (rdev->raid_disk >= 0 && |
5855 | !test_bit(Faulty, &rdev->flags) && | |
5856 | !test_bit(In_sync, &rdev->flags) && | |
5857 | rdev->recovery_offset < j) | |
5858 | j = rdev->recovery_offset; | |
5859 | } | |
1da177e4 | 5860 | |
61df9d91 N |
5861 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5862 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5863 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5864 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5865 | "(but not more than %d KB/sec) for %s.\n", |
5866 | speed_max(mddev), desc); | |
1da177e4 LT |
5867 | |
5868 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5869 | |
57afd89f | 5870 | io_sectors = 0; |
1da177e4 LT |
5871 | for (m = 0; m < SYNC_MARKS; m++) { |
5872 | mark[m] = jiffies; | |
57afd89f | 5873 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5874 | } |
5875 | last_mark = 0; | |
5876 | mddev->resync_mark = mark[last_mark]; | |
5877 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
5878 | ||
5879 | /* | |
5880 | * Tune reconstruction: | |
5881 | */ | |
5882 | window = 32*(PAGE_SIZE/512); | |
5883 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
5884 | window/2,(unsigned long long) max_sectors/2); | |
5885 | ||
5886 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
5887 | last_check = 0; |
5888 | ||
5889 | if (j>2) { | |
5890 | printk(KERN_INFO | |
61df9d91 N |
5891 | "md: resuming %s of %s from checkpoint.\n", |
5892 | desc, mdname(mddev)); | |
1da177e4 LT |
5893 | mddev->curr_resync = j; |
5894 | } | |
5895 | ||
5896 | while (j < max_sectors) { | |
57afd89f | 5897 | sector_t sectors; |
1da177e4 | 5898 | |
57afd89f | 5899 | skipped = 0; |
c6207277 N |
5900 | if (j >= mddev->resync_max) { |
5901 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
5902 | wait_event(mddev->recovery_wait, | |
5903 | mddev->resync_max > j | |
5904 | || kthread_should_stop()); | |
5905 | } | |
5906 | if (kthread_should_stop()) | |
5907 | goto interrupted; | |
57afd89f | 5908 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 5909 | currspeed < speed_min(mddev)); |
57afd89f | 5910 | if (sectors == 0) { |
dfc70645 | 5911 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5912 | goto out; |
5913 | } | |
57afd89f N |
5914 | |
5915 | if (!skipped) { /* actual IO requested */ | |
5916 | io_sectors += sectors; | |
5917 | atomic_add(sectors, &mddev->recovery_active); | |
5918 | } | |
5919 | ||
1da177e4 LT |
5920 | j += sectors; |
5921 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 5922 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
5923 | if (last_check == 0) |
5924 | /* this is the earliers that rebuilt will be | |
5925 | * visible in /proc/mdstat | |
5926 | */ | |
5927 | md_new_event(mddev); | |
57afd89f N |
5928 | |
5929 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
5930 | continue; |
5931 | ||
57afd89f | 5932 | last_check = io_sectors; |
1da177e4 | 5933 | |
dfc70645 | 5934 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
5935 | break; |
5936 | ||
5937 | repeat: | |
5938 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
5939 | /* step marks */ | |
5940 | int next = (last_mark+1) % SYNC_MARKS; | |
5941 | ||
5942 | mddev->resync_mark = mark[next]; | |
5943 | mddev->resync_mark_cnt = mark_cnt[next]; | |
5944 | mark[next] = jiffies; | |
57afd89f | 5945 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5946 | last_mark = next; |
5947 | } | |
5948 | ||
5949 | ||
c6207277 N |
5950 | if (kthread_should_stop()) |
5951 | goto interrupted; | |
5952 | ||
1da177e4 LT |
5953 | |
5954 | /* | |
5955 | * this loop exits only if either when we are slower than | |
5956 | * the 'hard' speed limit, or the system was IO-idle for | |
5957 | * a jiffy. | |
5958 | * the system might be non-idle CPU-wise, but we only care | |
5959 | * about not overloading the IO subsystem. (things like an | |
5960 | * e2fsck being done on the RAID array should execute fast) | |
5961 | */ | |
2ad8b1ef | 5962 | blk_unplug(mddev->queue); |
1da177e4 LT |
5963 | cond_resched(); |
5964 | ||
57afd89f N |
5965 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
5966 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 5967 | |
88202a0c N |
5968 | if (currspeed > speed_min(mddev)) { |
5969 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 5970 | !is_mddev_idle(mddev)) { |
c0e48521 | 5971 | msleep(500); |
1da177e4 LT |
5972 | goto repeat; |
5973 | } | |
5974 | } | |
5975 | } | |
61df9d91 | 5976 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
5977 | /* |
5978 | * this also signals 'finished resyncing' to md_stop | |
5979 | */ | |
5980 | out: | |
2ad8b1ef | 5981 | blk_unplug(mddev->queue); |
1da177e4 LT |
5982 | |
5983 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
5984 | ||
5985 | /* tell personality that we are finished */ | |
57afd89f | 5986 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 5987 | |
dfc70645 | 5988 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
5989 | mddev->curr_resync > 2) { |
5990 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
5991 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
5992 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
5993 | printk(KERN_INFO | |
61df9d91 N |
5994 | "md: checkpointing %s of %s.\n", |
5995 | desc, mdname(mddev)); | |
5fd6c1dc N |
5996 | mddev->recovery_cp = mddev->curr_resync; |
5997 | } | |
5998 | } else | |
5999 | mddev->recovery_cp = MaxSector; | |
6000 | } else { | |
6001 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6002 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6003 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6004 | if (rdev->raid_disk >= 0 && |
6005 | !test_bit(Faulty, &rdev->flags) && | |
6006 | !test_bit(In_sync, &rdev->flags) && | |
6007 | rdev->recovery_offset < mddev->curr_resync) | |
6008 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6009 | } |
1da177e4 | 6010 | } |
17571284 | 6011 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6012 | |
1da177e4 LT |
6013 | skip: |
6014 | mddev->curr_resync = 0; | |
5e96ee65 | 6015 | mddev->resync_min = 0; |
c6207277 N |
6016 | mddev->resync_max = MaxSector; |
6017 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
6018 | wake_up(&resync_wait); |
6019 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6020 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6021 | return; |
6022 | ||
6023 | interrupted: | |
6024 | /* | |
6025 | * got a signal, exit. | |
6026 | */ | |
6027 | printk(KERN_INFO | |
6028 | "md: md_do_sync() got signal ... exiting\n"); | |
6029 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6030 | goto out; | |
6031 | ||
1da177e4 | 6032 | } |
29269553 | 6033 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6034 | |
6035 | ||
b4c4c7b8 N |
6036 | static int remove_and_add_spares(mddev_t *mddev) |
6037 | { | |
6038 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6039 | int spares = 0; |
6040 | ||
159ec1fc | 6041 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6042 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6043 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6044 | (test_bit(Faulty, &rdev->flags) || |
6045 | ! test_bit(In_sync, &rdev->flags)) && | |
6046 | atomic_read(&rdev->nr_pending)==0) { | |
6047 | if (mddev->pers->hot_remove_disk( | |
6048 | mddev, rdev->raid_disk)==0) { | |
6049 | char nm[20]; | |
6050 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6051 | sysfs_remove_link(&mddev->kobj, nm); | |
6052 | rdev->raid_disk = -1; | |
6053 | } | |
6054 | } | |
6055 | ||
c89a8eee | 6056 | if (mddev->degraded && ! mddev->ro) { |
159ec1fc | 6057 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6058 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6059 | !test_bit(In_sync, &rdev->flags) && |
6060 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6061 | spares++; |
b4c4c7b8 N |
6062 | if (rdev->raid_disk < 0 |
6063 | && !test_bit(Faulty, &rdev->flags)) { | |
6064 | rdev->recovery_offset = 0; | |
199050ea NB |
6065 | if (mddev->pers-> |
6066 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6067 | char nm[20]; |
6068 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6069 | if (sysfs_create_link(&mddev->kobj, |
6070 | &rdev->kobj, nm)) | |
6071 | printk(KERN_WARNING | |
6072 | "md: cannot register " | |
6073 | "%s for %s\n", | |
6074 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6075 | spares++; |
6076 | md_new_event(mddev); | |
6077 | } else | |
6078 | break; | |
6079 | } | |
dfc70645 | 6080 | } |
b4c4c7b8 N |
6081 | } |
6082 | return spares; | |
6083 | } | |
1da177e4 LT |
6084 | /* |
6085 | * This routine is regularly called by all per-raid-array threads to | |
6086 | * deal with generic issues like resync and super-block update. | |
6087 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6088 | * need this as they never do any recovery or update the superblock. | |
6089 | * | |
6090 | * It does not do any resync itself, but rather "forks" off other threads | |
6091 | * to do that as needed. | |
6092 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6093 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6094 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6095 | * and wakeups up this thread which will reap the thread and finish up. |
6096 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6097 | * | |
6098 | * The overall approach is: | |
6099 | * 1/ if the superblock needs updating, update it. | |
6100 | * 2/ If a recovery thread is running, don't do anything else. | |
6101 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6102 | * 4/ If there are any faulty devices, remove them. | |
6103 | * 5/ If array is degraded, try to add spares devices | |
6104 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6105 | */ | |
6106 | void md_check_recovery(mddev_t *mddev) | |
6107 | { | |
6108 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6109 | |
6110 | ||
5f40402d N |
6111 | if (mddev->bitmap) |
6112 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
6113 | |
6114 | if (mddev->ro) | |
6115 | return; | |
fca4d848 N |
6116 | |
6117 | if (signal_pending(current)) { | |
31a59e34 | 6118 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6119 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6120 | mdname(mddev)); | |
6121 | mddev->safemode = 2; | |
6122 | } | |
6123 | flush_signals(current); | |
6124 | } | |
6125 | ||
c89a8eee N |
6126 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6127 | return; | |
1da177e4 | 6128 | if ( ! ( |
e691063a | 6129 | (mddev->flags && !mddev->external) || |
1da177e4 | 6130 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6131 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6132 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6133 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6134 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6135 | )) |
6136 | return; | |
fca4d848 | 6137 | |
df5b89b3 | 6138 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6139 | int spares = 0; |
fca4d848 | 6140 | |
c89a8eee N |
6141 | if (mddev->ro) { |
6142 | /* Only thing we do on a ro array is remove | |
6143 | * failed devices. | |
6144 | */ | |
6145 | remove_and_add_spares(mddev); | |
6146 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6147 | goto unlock; | |
6148 | } | |
6149 | ||
31a59e34 | 6150 | if (!mddev->external) { |
0fd62b86 | 6151 | int did_change = 0; |
31a59e34 N |
6152 | spin_lock_irq(&mddev->write_lock); |
6153 | if (mddev->safemode && | |
6154 | !atomic_read(&mddev->writes_pending) && | |
6155 | !mddev->in_sync && | |
6156 | mddev->recovery_cp == MaxSector) { | |
6157 | mddev->in_sync = 1; | |
0fd62b86 | 6158 | did_change = 1; |
31a59e34 N |
6159 | if (mddev->persistent) |
6160 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6161 | } | |
6162 | if (mddev->safemode == 1) | |
6163 | mddev->safemode = 0; | |
6164 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6165 | if (did_change) |
b62b7590 | 6166 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6167 | } |
fca4d848 | 6168 | |
850b2b42 N |
6169 | if (mddev->flags) |
6170 | md_update_sb(mddev, 0); | |
06d91a5f | 6171 | |
159ec1fc | 6172 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6173 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6174 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6175 | |
06d91a5f | 6176 | |
1da177e4 LT |
6177 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6178 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6179 | /* resync/recovery still happening */ | |
6180 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6181 | goto unlock; | |
6182 | } | |
6183 | if (mddev->sync_thread) { | |
6184 | /* resync has finished, collect result */ | |
6185 | md_unregister_thread(mddev->sync_thread); | |
6186 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6187 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6188 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6189 | /* success...*/ |
6190 | /* activate any spares */ | |
a99ac971 NB |
6191 | if (mddev->pers->spare_active(mddev)) |
6192 | sysfs_notify(&mddev->kobj, NULL, | |
6193 | "degraded"); | |
1da177e4 | 6194 | } |
850b2b42 | 6195 | md_update_sb(mddev, 1); |
41158c7e N |
6196 | |
6197 | /* if array is no-longer degraded, then any saved_raid_disk | |
6198 | * information must be scrapped | |
6199 | */ | |
6200 | if (!mddev->degraded) | |
159ec1fc | 6201 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6202 | rdev->saved_raid_disk = -1; |
6203 | ||
1da177e4 LT |
6204 | mddev->recovery = 0; |
6205 | /* flag recovery needed just to double check */ | |
6206 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6207 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6208 | md_new_event(mddev); |
1da177e4 LT |
6209 | goto unlock; |
6210 | } | |
72a23c21 NB |
6211 | /* Set RUNNING before clearing NEEDED to avoid |
6212 | * any transients in the value of "sync_action". | |
6213 | */ | |
6214 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6215 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6216 | /* Clear some bits that don't mean anything, but |
6217 | * might be left set | |
6218 | */ | |
24dd469d N |
6219 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6220 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6221 | |
5fd6c1dc N |
6222 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6223 | goto unlock; | |
1da177e4 LT |
6224 | /* no recovery is running. |
6225 | * remove any failed drives, then | |
6226 | * add spares if possible. | |
6227 | * Spare are also removed and re-added, to allow | |
6228 | * the personality to fail the re-add. | |
6229 | */ | |
1da177e4 | 6230 | |
b4c4c7b8 N |
6231 | if (mddev->reshape_position != MaxSector) { |
6232 | if (mddev->pers->check_reshape(mddev) != 0) | |
6233 | /* Cannot proceed */ | |
6234 | goto unlock; | |
6235 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6236 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6237 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6238 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6239 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6240 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6241 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6242 | } else if (mddev->recovery_cp < MaxSector) { |
6243 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6244 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6245 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6246 | /* nothing to be done ... */ | |
1da177e4 | 6247 | goto unlock; |
24dd469d | 6248 | |
1da177e4 | 6249 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6250 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6251 | /* We are adding a device or devices to an array | |
6252 | * which has the bitmap stored on all devices. | |
6253 | * So make sure all bitmap pages get written | |
6254 | */ | |
6255 | bitmap_write_all(mddev->bitmap); | |
6256 | } | |
1da177e4 LT |
6257 | mddev->sync_thread = md_register_thread(md_do_sync, |
6258 | mddev, | |
6259 | "%s_resync"); | |
6260 | if (!mddev->sync_thread) { | |
6261 | printk(KERN_ERR "%s: could not start resync" | |
6262 | " thread...\n", | |
6263 | mdname(mddev)); | |
6264 | /* leave the spares where they are, it shouldn't hurt */ | |
6265 | mddev->recovery = 0; | |
d7603b7e | 6266 | } else |
1da177e4 | 6267 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6268 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6269 | md_new_event(mddev); |
1da177e4 LT |
6270 | } |
6271 | unlock: | |
72a23c21 NB |
6272 | if (!mddev->sync_thread) { |
6273 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6274 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6275 | &mddev->recovery)) | |
0c3573f1 N |
6276 | if (mddev->sysfs_action) |
6277 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6278 | } |
1da177e4 LT |
6279 | mddev_unlock(mddev); |
6280 | } | |
6281 | } | |
6282 | ||
6bfe0b49 DW |
6283 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6284 | { | |
3c0ee63a | 6285 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
6286 | wait_event_timeout(rdev->blocked_wait, |
6287 | !test_bit(Blocked, &rdev->flags), | |
6288 | msecs_to_jiffies(5000)); | |
6289 | rdev_dec_pending(rdev, mddev); | |
6290 | } | |
6291 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6292 | ||
75c96f85 AB |
6293 | static int md_notify_reboot(struct notifier_block *this, |
6294 | unsigned long code, void *x) | |
1da177e4 LT |
6295 | { |
6296 | struct list_head *tmp; | |
6297 | mddev_t *mddev; | |
6298 | ||
6299 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6300 | ||
6301 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6302 | ||
29ac4aa3 | 6303 | for_each_mddev(mddev, tmp) |
c71d4887 | 6304 | if (mddev_trylock(mddev)) { |
2b25000b N |
6305 | /* Force a switch to readonly even array |
6306 | * appears to still be in use. Hence | |
6307 | * the '100'. | |
6308 | */ | |
d710e138 | 6309 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
6310 | mddev_unlock(mddev); |
6311 | } | |
1da177e4 LT |
6312 | /* |
6313 | * certain more exotic SCSI devices are known to be | |
6314 | * volatile wrt too early system reboots. While the | |
6315 | * right place to handle this issue is the given | |
6316 | * driver, we do want to have a safe RAID driver ... | |
6317 | */ | |
6318 | mdelay(1000*1); | |
6319 | } | |
6320 | return NOTIFY_DONE; | |
6321 | } | |
6322 | ||
75c96f85 | 6323 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6324 | .notifier_call = md_notify_reboot, |
6325 | .next = NULL, | |
6326 | .priority = INT_MAX, /* before any real devices */ | |
6327 | }; | |
6328 | ||
6329 | static void md_geninit(void) | |
6330 | { | |
1da177e4 LT |
6331 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6332 | ||
c7705f34 | 6333 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6334 | } |
6335 | ||
75c96f85 | 6336 | static int __init md_init(void) |
1da177e4 | 6337 | { |
1da177e4 LT |
6338 | if (register_blkdev(MAJOR_NR, "md")) |
6339 | return -1; | |
6340 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
6341 | unregister_blkdev(MAJOR_NR, "md"); | |
6342 | return -1; | |
6343 | } | |
e8703fe1 N |
6344 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
6345 | md_probe, NULL, NULL); | |
6346 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6347 | md_probe, NULL, NULL); |
6348 | ||
1da177e4 | 6349 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6350 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6351 | |
6352 | md_geninit(); | |
d710e138 | 6353 | return 0; |
1da177e4 LT |
6354 | } |
6355 | ||
6356 | ||
6357 | #ifndef MODULE | |
6358 | ||
6359 | /* | |
6360 | * Searches all registered partitions for autorun RAID arrays | |
6361 | * at boot time. | |
6362 | */ | |
4d936ec1 ME |
6363 | |
6364 | static LIST_HEAD(all_detected_devices); | |
6365 | struct detected_devices_node { | |
6366 | struct list_head list; | |
6367 | dev_t dev; | |
6368 | }; | |
1da177e4 LT |
6369 | |
6370 | void md_autodetect_dev(dev_t dev) | |
6371 | { | |
4d936ec1 ME |
6372 | struct detected_devices_node *node_detected_dev; |
6373 | ||
6374 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6375 | if (node_detected_dev) { | |
6376 | node_detected_dev->dev = dev; | |
6377 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6378 | } else { | |
6379 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6380 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6381 | } | |
1da177e4 LT |
6382 | } |
6383 | ||
6384 | ||
6385 | static void autostart_arrays(int part) | |
6386 | { | |
6387 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6388 | struct detected_devices_node *node_detected_dev; |
6389 | dev_t dev; | |
6390 | int i_scanned, i_passed; | |
1da177e4 | 6391 | |
4d936ec1 ME |
6392 | i_scanned = 0; |
6393 | i_passed = 0; | |
1da177e4 | 6394 | |
4d936ec1 | 6395 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6396 | |
4d936ec1 ME |
6397 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6398 | i_scanned++; | |
6399 | node_detected_dev = list_entry(all_detected_devices.next, | |
6400 | struct detected_devices_node, list); | |
6401 | list_del(&node_detected_dev->list); | |
6402 | dev = node_detected_dev->dev; | |
6403 | kfree(node_detected_dev); | |
df968c4e | 6404 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6405 | if (IS_ERR(rdev)) |
6406 | continue; | |
6407 | ||
b2d444d7 | 6408 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6409 | MD_BUG(); |
6410 | continue; | |
6411 | } | |
d0fae18f | 6412 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6413 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6414 | i_passed++; |
1da177e4 | 6415 | } |
4d936ec1 ME |
6416 | |
6417 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6418 | i_scanned, i_passed); | |
1da177e4 LT |
6419 | |
6420 | autorun_devices(part); | |
6421 | } | |
6422 | ||
fdee8ae4 | 6423 | #endif /* !MODULE */ |
1da177e4 LT |
6424 | |
6425 | static __exit void md_exit(void) | |
6426 | { | |
6427 | mddev_t *mddev; | |
6428 | struct list_head *tmp; | |
8ab5e4c1 | 6429 | |
e8703fe1 N |
6430 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
6431 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
6432 | |
6433 | unregister_blkdev(MAJOR_NR,"md"); | |
6434 | unregister_blkdev(mdp_major, "mdp"); | |
6435 | unregister_reboot_notifier(&md_notifier); | |
6436 | unregister_sysctl_table(raid_table_header); | |
6437 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6438 | for_each_mddev(mddev, tmp) { |
1da177e4 LT |
6439 | struct gendisk *disk = mddev->gendisk; |
6440 | if (!disk) | |
6441 | continue; | |
6442 | export_array(mddev); | |
1da177e4 LT |
6443 | mddev_put(mddev); |
6444 | } | |
6445 | } | |
6446 | ||
685784aa | 6447 | subsys_initcall(md_init); |
1da177e4 LT |
6448 | module_exit(md_exit) |
6449 | ||
f91de92e N |
6450 | static int get_ro(char *buffer, struct kernel_param *kp) |
6451 | { | |
6452 | return sprintf(buffer, "%d", start_readonly); | |
6453 | } | |
6454 | static int set_ro(const char *val, struct kernel_param *kp) | |
6455 | { | |
6456 | char *e; | |
6457 | int num = simple_strtoul(val, &e, 10); | |
6458 | if (*val && (*e == '\0' || *e == '\n')) { | |
6459 | start_readonly = num; | |
4dbcdc75 | 6460 | return 0; |
f91de92e N |
6461 | } |
6462 | return -EINVAL; | |
6463 | } | |
6464 | ||
80ca3a44 N |
6465 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6466 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6467 | |
f91de92e | 6468 | |
1da177e4 LT |
6469 | EXPORT_SYMBOL(register_md_personality); |
6470 | EXPORT_SYMBOL(unregister_md_personality); | |
6471 | EXPORT_SYMBOL(md_error); | |
6472 | EXPORT_SYMBOL(md_done_sync); | |
6473 | EXPORT_SYMBOL(md_write_start); | |
6474 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6475 | EXPORT_SYMBOL(md_register_thread); |
6476 | EXPORT_SYMBOL(md_unregister_thread); | |
6477 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6478 | EXPORT_SYMBOL(md_check_recovery); |
6479 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6480 | MODULE_ALIAS("md"); |
72008652 | 6481 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |