Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
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 | ||
d3374825 N |
217 | static void mddev_delayed_delete(struct work_struct *ws) |
218 | { | |
219 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
220 | kobject_del(&mddev->kobj); | |
221 | kobject_put(&mddev->kobj); | |
222 | } | |
223 | ||
1da177e4 LT |
224 | static void mddev_put(mddev_t *mddev) |
225 | { | |
226 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
227 | return; | |
d3374825 N |
228 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
229 | !mddev->hold_active) { | |
1da177e4 | 230 | list_del(&mddev->all_mddevs); |
d3374825 N |
231 | if (mddev->gendisk) { |
232 | /* we did a probe so need to clean up. | |
233 | * Call schedule_work inside the spinlock | |
234 | * so that flush_scheduled_work() after | |
235 | * mddev_find will succeed in waiting for the | |
236 | * work to be done. | |
237 | */ | |
238 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
239 | schedule_work(&mddev->del_work); | |
240 | } else | |
241 | kfree(mddev); | |
242 | } | |
243 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
244 | } |
245 | ||
246 | static mddev_t * mddev_find(dev_t unit) | |
247 | { | |
248 | mddev_t *mddev, *new = NULL; | |
249 | ||
250 | retry: | |
251 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
252 | |
253 | if (unit) { | |
254 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
255 | if (mddev->unit == unit) { | |
256 | mddev_get(mddev); | |
257 | spin_unlock(&all_mddevs_lock); | |
258 | kfree(new); | |
259 | return mddev; | |
260 | } | |
261 | ||
262 | if (new) { | |
263 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 264 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
265 | new->hold_active = UNTIL_IOCTL; |
266 | return new; | |
1da177e4 | 267 | } |
efeb53c0 N |
268 | } else if (new) { |
269 | /* find an unused unit number */ | |
270 | static int next_minor = 512; | |
271 | int start = next_minor; | |
272 | int is_free = 0; | |
273 | int dev = 0; | |
274 | while (!is_free) { | |
275 | dev = MKDEV(MD_MAJOR, next_minor); | |
276 | next_minor++; | |
277 | if (next_minor > MINORMASK) | |
278 | next_minor = 0; | |
279 | if (next_minor == start) { | |
280 | /* Oh dear, all in use. */ | |
281 | spin_unlock(&all_mddevs_lock); | |
282 | kfree(new); | |
283 | return NULL; | |
284 | } | |
285 | ||
286 | is_free = 1; | |
287 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
288 | if (mddev->unit == dev) { | |
289 | is_free = 0; | |
290 | break; | |
291 | } | |
292 | } | |
293 | new->unit = dev; | |
294 | new->md_minor = MINOR(dev); | |
295 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
296 | list_add(&new->all_mddevs, &all_mddevs); |
297 | spin_unlock(&all_mddevs_lock); | |
298 | return new; | |
299 | } | |
300 | spin_unlock(&all_mddevs_lock); | |
301 | ||
9ffae0cf | 302 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
303 | if (!new) |
304 | return NULL; | |
305 | ||
1da177e4 LT |
306 | new->unit = unit; |
307 | if (MAJOR(unit) == MD_MAJOR) | |
308 | new->md_minor = MINOR(unit); | |
309 | else | |
310 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
311 | ||
df5b89b3 | 312 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
313 | INIT_LIST_HEAD(&new->disks); |
314 | INIT_LIST_HEAD(&new->all_mddevs); | |
315 | init_timer(&new->safemode_timer); | |
316 | atomic_set(&new->active, 1); | |
f2ea68cf | 317 | atomic_set(&new->openers, 0); |
06d91a5f | 318 | spin_lock_init(&new->write_lock); |
3d310eb7 | 319 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 320 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 321 | new->reshape_position = MaxSector; |
5e96ee65 | 322 | new->resync_min = 0; |
c6207277 | 323 | new->resync_max = MaxSector; |
d897dbf9 | 324 | new->level = LEVEL_NONE; |
1da177e4 | 325 | |
1da177e4 LT |
326 | goto retry; |
327 | } | |
328 | ||
329 | static inline int mddev_lock(mddev_t * mddev) | |
330 | { | |
df5b89b3 | 331 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
332 | } |
333 | ||
1da177e4 LT |
334 | static inline int mddev_trylock(mddev_t * mddev) |
335 | { | |
df5b89b3 | 336 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
337 | } |
338 | ||
339 | static inline void mddev_unlock(mddev_t * mddev) | |
340 | { | |
df5b89b3 | 341 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 342 | |
005eca5e | 343 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
344 | } |
345 | ||
2989ddbd | 346 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 347 | { |
159ec1fc | 348 | mdk_rdev_t *rdev; |
1da177e4 | 349 | |
159ec1fc | 350 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
351 | if (rdev->desc_nr == nr) |
352 | return rdev; | |
159ec1fc | 353 | |
1da177e4 LT |
354 | return NULL; |
355 | } | |
356 | ||
357 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
358 | { | |
1da177e4 LT |
359 | mdk_rdev_t *rdev; |
360 | ||
159ec1fc | 361 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
362 | if (rdev->bdev->bd_dev == dev) |
363 | return rdev; | |
159ec1fc | 364 | |
1da177e4 LT |
365 | return NULL; |
366 | } | |
367 | ||
d9d166c2 | 368 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
369 | { |
370 | struct mdk_personality *pers; | |
d9d166c2 N |
371 | list_for_each_entry(pers, &pers_list, list) { |
372 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 373 | return pers; |
d9d166c2 N |
374 | if (strcmp(pers->name, clevel)==0) |
375 | return pers; | |
376 | } | |
2604b703 N |
377 | return NULL; |
378 | } | |
379 | ||
b73df2d3 | 380 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 381 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 382 | { |
b73df2d3 AN |
383 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
384 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
385 | } |
386 | ||
e7debaa4 | 387 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 388 | { |
0f420358 | 389 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
390 | |
391 | if (chunk_size) | |
e7debaa4 AN |
392 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
393 | return num_sectors; | |
1da177e4 LT |
394 | } |
395 | ||
396 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
397 | { | |
398 | if (rdev->sb_page) | |
399 | MD_BUG(); | |
400 | ||
401 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
402 | if (!rdev->sb_page) { | |
403 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 404 | return -ENOMEM; |
1da177e4 LT |
405 | } |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | static void free_disk_sb(mdk_rdev_t * rdev) | |
411 | { | |
412 | if (rdev->sb_page) { | |
2d1f3b5d | 413 | put_page(rdev->sb_page); |
1da177e4 LT |
414 | rdev->sb_loaded = 0; |
415 | rdev->sb_page = NULL; | |
0f420358 | 416 | rdev->sb_start = 0; |
1da177e4 LT |
417 | rdev->size = 0; |
418 | } | |
419 | } | |
420 | ||
421 | ||
6712ecf8 | 422 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
423 | { |
424 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 425 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 426 | |
3a0f5bbb N |
427 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
428 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
429 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
430 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 431 | md_error(mddev, rdev); |
3a0f5bbb | 432 | } |
7bfa19f2 | 433 | |
a9701a30 N |
434 | if (atomic_dec_and_test(&mddev->pending_writes)) |
435 | wake_up(&mddev->sb_wait); | |
f8b58edf | 436 | bio_put(bio); |
7bfa19f2 N |
437 | } |
438 | ||
6712ecf8 | 439 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
440 | { |
441 | struct bio *bio2 = bio->bi_private; | |
442 | mdk_rdev_t *rdev = bio2->bi_private; | |
443 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
444 | |
445 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
446 | error == -EOPNOTSUPP) { | |
447 | unsigned long flags; | |
448 | /* barriers don't appear to be supported :-( */ | |
449 | set_bit(BarriersNotsupp, &rdev->flags); | |
450 | mddev->barriers_work = 0; | |
451 | spin_lock_irqsave(&mddev->write_lock, flags); | |
452 | bio2->bi_next = mddev->biolist; | |
453 | mddev->biolist = bio2; | |
454 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
455 | wake_up(&mddev->sb_wait); | |
456 | bio_put(bio); | |
6712ecf8 N |
457 | } else { |
458 | bio_put(bio2); | |
459 | bio->bi_private = rdev; | |
460 | super_written(bio, error); | |
a9701a30 | 461 | } |
a9701a30 N |
462 | } |
463 | ||
7bfa19f2 N |
464 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
465 | sector_t sector, int size, struct page *page) | |
466 | { | |
467 | /* write first size bytes of page to sector of rdev | |
468 | * Increment mddev->pending_writes before returning | |
469 | * and decrement it on completion, waking up sb_wait | |
470 | * if zero is reached. | |
471 | * If an error occurred, call md_error | |
a9701a30 N |
472 | * |
473 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
474 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
475 | */ |
476 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 477 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
478 | |
479 | bio->bi_bdev = rdev->bdev; | |
480 | bio->bi_sector = sector; | |
481 | bio_add_page(bio, page, size, 0); | |
482 | bio->bi_private = rdev; | |
483 | bio->bi_end_io = super_written; | |
a9701a30 N |
484 | bio->bi_rw = rw; |
485 | ||
7bfa19f2 | 486 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
487 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
488 | struct bio *rbio; | |
489 | rw |= (1<<BIO_RW_BARRIER); | |
490 | rbio = bio_clone(bio, GFP_NOIO); | |
491 | rbio->bi_private = bio; | |
492 | rbio->bi_end_io = super_written_barrier; | |
493 | submit_bio(rw, rbio); | |
494 | } else | |
495 | submit_bio(rw, bio); | |
496 | } | |
497 | ||
498 | void md_super_wait(mddev_t *mddev) | |
499 | { | |
500 | /* wait for all superblock writes that were scheduled to complete. | |
501 | * if any had to be retried (due to BARRIER problems), retry them | |
502 | */ | |
503 | DEFINE_WAIT(wq); | |
504 | for(;;) { | |
505 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
506 | if (atomic_read(&mddev->pending_writes)==0) | |
507 | break; | |
508 | while (mddev->biolist) { | |
509 | struct bio *bio; | |
510 | spin_lock_irq(&mddev->write_lock); | |
511 | bio = mddev->biolist; | |
512 | mddev->biolist = bio->bi_next ; | |
513 | bio->bi_next = NULL; | |
514 | spin_unlock_irq(&mddev->write_lock); | |
515 | submit_bio(bio->bi_rw, bio); | |
516 | } | |
517 | schedule(); | |
518 | } | |
519 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
520 | } |
521 | ||
6712ecf8 | 522 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 523 | { |
1da177e4 | 524 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
525 | } |
526 | ||
a654b9d8 | 527 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
528 | struct page *page, int rw) |
529 | { | |
baaa2c51 | 530 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
531 | struct completion event; |
532 | int ret; | |
533 | ||
534 | rw |= (1 << BIO_RW_SYNC); | |
535 | ||
536 | bio->bi_bdev = bdev; | |
537 | bio->bi_sector = sector; | |
538 | bio_add_page(bio, page, size, 0); | |
539 | init_completion(&event); | |
540 | bio->bi_private = &event; | |
541 | bio->bi_end_io = bi_complete; | |
542 | submit_bio(rw, bio); | |
543 | wait_for_completion(&event); | |
544 | ||
545 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
546 | bio_put(bio); | |
547 | return ret; | |
548 | } | |
a8745db2 | 549 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 550 | |
0002b271 | 551 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
552 | { |
553 | char b[BDEVNAME_SIZE]; | |
554 | if (!rdev->sb_page) { | |
555 | MD_BUG(); | |
556 | return -EINVAL; | |
557 | } | |
558 | if (rdev->sb_loaded) | |
559 | return 0; | |
560 | ||
561 | ||
0f420358 | 562 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
563 | goto fail; |
564 | rdev->sb_loaded = 1; | |
565 | return 0; | |
566 | ||
567 | fail: | |
568 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
569 | bdevname(rdev->bdev,b)); | |
570 | return -EINVAL; | |
571 | } | |
572 | ||
573 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
574 | { | |
05710466 AN |
575 | return sb1->set_uuid0 == sb2->set_uuid0 && |
576 | sb1->set_uuid1 == sb2->set_uuid1 && | |
577 | sb1->set_uuid2 == sb2->set_uuid2 && | |
578 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
579 | } |
580 | ||
1da177e4 LT |
581 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
582 | { | |
583 | int ret; | |
584 | mdp_super_t *tmp1, *tmp2; | |
585 | ||
586 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
587 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
588 | ||
589 | if (!tmp1 || !tmp2) { | |
590 | ret = 0; | |
35020f1a | 591 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
592 | goto abort; |
593 | } | |
594 | ||
595 | *tmp1 = *sb1; | |
596 | *tmp2 = *sb2; | |
597 | ||
598 | /* | |
599 | * nr_disks is not constant | |
600 | */ | |
601 | tmp1->nr_disks = 0; | |
602 | tmp2->nr_disks = 0; | |
603 | ||
ce0c8e05 | 604 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 605 | abort: |
990a8baf JJ |
606 | kfree(tmp1); |
607 | kfree(tmp2); | |
1da177e4 LT |
608 | return ret; |
609 | } | |
610 | ||
4d167f09 N |
611 | |
612 | static u32 md_csum_fold(u32 csum) | |
613 | { | |
614 | csum = (csum & 0xffff) + (csum >> 16); | |
615 | return (csum & 0xffff) + (csum >> 16); | |
616 | } | |
617 | ||
1da177e4 LT |
618 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
619 | { | |
4d167f09 N |
620 | u64 newcsum = 0; |
621 | u32 *sb32 = (u32*)sb; | |
622 | int i; | |
1da177e4 LT |
623 | unsigned int disk_csum, csum; |
624 | ||
625 | disk_csum = sb->sb_csum; | |
626 | sb->sb_csum = 0; | |
4d167f09 N |
627 | |
628 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
629 | newcsum += sb32[i]; | |
630 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
631 | ||
632 | ||
633 | #ifdef CONFIG_ALPHA | |
634 | /* This used to use csum_partial, which was wrong for several | |
635 | * reasons including that different results are returned on | |
636 | * different architectures. It isn't critical that we get exactly | |
637 | * the same return value as before (we always csum_fold before | |
638 | * testing, and that removes any differences). However as we | |
639 | * know that csum_partial always returned a 16bit value on | |
640 | * alphas, do a fold to maximise conformity to previous behaviour. | |
641 | */ | |
642 | sb->sb_csum = md_csum_fold(disk_csum); | |
643 | #else | |
1da177e4 | 644 | sb->sb_csum = disk_csum; |
4d167f09 | 645 | #endif |
1da177e4 LT |
646 | return csum; |
647 | } | |
648 | ||
649 | ||
650 | /* | |
651 | * Handle superblock details. | |
652 | * We want to be able to handle multiple superblock formats | |
653 | * so we have a common interface to them all, and an array of | |
654 | * different handlers. | |
655 | * We rely on user-space to write the initial superblock, and support | |
656 | * reading and updating of superblocks. | |
657 | * Interface methods are: | |
658 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
659 | * loads and validates a superblock on dev. | |
660 | * if refdev != NULL, compare superblocks on both devices | |
661 | * Return: | |
662 | * 0 - dev has a superblock that is compatible with refdev | |
663 | * 1 - dev has a superblock that is compatible and newer than refdev | |
664 | * so dev should be used as the refdev in future | |
665 | * -EINVAL superblock incompatible or invalid | |
666 | * -othererror e.g. -EIO | |
667 | * | |
668 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
669 | * Verify that dev is acceptable into mddev. | |
670 | * The first time, mddev->raid_disks will be 0, and data from | |
671 | * dev should be merged in. Subsequent calls check that dev | |
672 | * is new enough. Return 0 or -EINVAL | |
673 | * | |
674 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
675 | * Update the superblock for rdev with data in mddev | |
676 | * This does not write to disc. | |
677 | * | |
678 | */ | |
679 | ||
680 | struct super_type { | |
0cd17fec CW |
681 | char *name; |
682 | struct module *owner; | |
683 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
684 | int minor_version); | |
685 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
686 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
687 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 688 | sector_t num_sectors); |
1da177e4 LT |
689 | }; |
690 | ||
691 | /* | |
692 | * load_super for 0.90.0 | |
693 | */ | |
694 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
695 | { | |
696 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
697 | mdp_super_t *sb; | |
698 | int ret; | |
1da177e4 LT |
699 | |
700 | /* | |
0f420358 | 701 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
702 | * it's at the end of the disk. |
703 | * | |
704 | * It also happens to be a multiple of 4Kb. | |
705 | */ | |
0f420358 | 706 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 707 | |
0002b271 | 708 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
709 | if (ret) return ret; |
710 | ||
711 | ret = -EINVAL; | |
712 | ||
713 | bdevname(rdev->bdev, b); | |
714 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
715 | ||
716 | if (sb->md_magic != MD_SB_MAGIC) { | |
717 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
718 | b); | |
719 | goto abort; | |
720 | } | |
721 | ||
722 | if (sb->major_version != 0 || | |
f6705578 N |
723 | sb->minor_version < 90 || |
724 | sb->minor_version > 91) { | |
1da177e4 LT |
725 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
726 | sb->major_version, sb->minor_version, | |
727 | b); | |
728 | goto abort; | |
729 | } | |
730 | ||
731 | if (sb->raid_disks <= 0) | |
732 | goto abort; | |
733 | ||
4d167f09 | 734 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
735 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
736 | b); | |
737 | goto abort; | |
738 | } | |
739 | ||
740 | rdev->preferred_minor = sb->md_minor; | |
741 | rdev->data_offset = 0; | |
0002b271 | 742 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 743 | |
e11e93fa N |
744 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
745 | if (sb->level != 1 && sb->level != 4 | |
746 | && sb->level != 5 && sb->level != 6 | |
747 | && sb->level != 10) { | |
748 | /* FIXME use a better test */ | |
749 | printk(KERN_WARNING | |
750 | "md: bitmaps not supported for this level.\n"); | |
751 | goto abort; | |
752 | } | |
753 | } | |
754 | ||
1da177e4 LT |
755 | if (sb->level == LEVEL_MULTIPATH) |
756 | rdev->desc_nr = -1; | |
757 | else | |
758 | rdev->desc_nr = sb->this_disk.number; | |
759 | ||
9a7b2b0f | 760 | if (!refdev) { |
1da177e4 | 761 | ret = 1; |
9a7b2b0f | 762 | } else { |
1da177e4 LT |
763 | __u64 ev1, ev2; |
764 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
765 | if (!uuid_equal(refsb, sb)) { | |
766 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
767 | b, bdevname(refdev->bdev,b2)); | |
768 | goto abort; | |
769 | } | |
770 | if (!sb_equal(refsb, sb)) { | |
771 | printk(KERN_WARNING "md: %s has same UUID" | |
772 | " but different superblock to %s\n", | |
773 | b, bdevname(refdev->bdev, b2)); | |
774 | goto abort; | |
775 | } | |
776 | ev1 = md_event(sb); | |
777 | ev2 = md_event(refsb); | |
778 | if (ev1 > ev2) | |
779 | ret = 1; | |
780 | else | |
781 | ret = 0; | |
782 | } | |
e7debaa4 | 783 | rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2; |
1da177e4 | 784 | |
2bf071bf N |
785 | if (rdev->size < sb->size && sb->level > 1) |
786 | /* "this cannot possibly happen" ... */ | |
787 | ret = -EINVAL; | |
788 | ||
1da177e4 LT |
789 | abort: |
790 | return ret; | |
791 | } | |
792 | ||
793 | /* | |
794 | * validate_super for 0.90.0 | |
795 | */ | |
796 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
797 | { | |
798 | mdp_disk_t *desc; | |
799 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 800 | __u64 ev1 = md_event(sb); |
1da177e4 | 801 | |
41158c7e | 802 | rdev->raid_disk = -1; |
c5d79adb N |
803 | clear_bit(Faulty, &rdev->flags); |
804 | clear_bit(In_sync, &rdev->flags); | |
805 | clear_bit(WriteMostly, &rdev->flags); | |
806 | clear_bit(BarriersNotsupp, &rdev->flags); | |
807 | ||
1da177e4 LT |
808 | if (mddev->raid_disks == 0) { |
809 | mddev->major_version = 0; | |
810 | mddev->minor_version = sb->minor_version; | |
811 | mddev->patch_version = sb->patch_version; | |
e691063a | 812 | mddev->external = 0; |
1da177e4 LT |
813 | mddev->chunk_size = sb->chunk_size; |
814 | mddev->ctime = sb->ctime; | |
815 | mddev->utime = sb->utime; | |
816 | mddev->level = sb->level; | |
d9d166c2 | 817 | mddev->clevel[0] = 0; |
1da177e4 LT |
818 | mddev->layout = sb->layout; |
819 | mddev->raid_disks = sb->raid_disks; | |
820 | mddev->size = sb->size; | |
07d84d10 | 821 | mddev->events = ev1; |
9223214e | 822 | mddev->bitmap_offset = 0; |
36fa3063 | 823 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 824 | |
f6705578 N |
825 | if (mddev->minor_version >= 91) { |
826 | mddev->reshape_position = sb->reshape_position; | |
827 | mddev->delta_disks = sb->delta_disks; | |
828 | mddev->new_level = sb->new_level; | |
829 | mddev->new_layout = sb->new_layout; | |
830 | mddev->new_chunk = sb->new_chunk; | |
831 | } else { | |
832 | mddev->reshape_position = MaxSector; | |
833 | mddev->delta_disks = 0; | |
834 | mddev->new_level = mddev->level; | |
835 | mddev->new_layout = mddev->layout; | |
836 | mddev->new_chunk = mddev->chunk_size; | |
837 | } | |
838 | ||
1da177e4 LT |
839 | if (sb->state & (1<<MD_SB_CLEAN)) |
840 | mddev->recovery_cp = MaxSector; | |
841 | else { | |
842 | if (sb->events_hi == sb->cp_events_hi && | |
843 | sb->events_lo == sb->cp_events_lo) { | |
844 | mddev->recovery_cp = sb->recovery_cp; | |
845 | } else | |
846 | mddev->recovery_cp = 0; | |
847 | } | |
848 | ||
849 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
850 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
851 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
852 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
853 | ||
854 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
855 | |
856 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 857 | mddev->bitmap_file == NULL) |
36fa3063 | 858 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 859 | |
41158c7e N |
860 | } else if (mddev->pers == NULL) { |
861 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
862 | ++ev1; |
863 | if (ev1 < mddev->events) | |
864 | return -EINVAL; | |
41158c7e N |
865 | } else if (mddev->bitmap) { |
866 | /* if adding to array with a bitmap, then we can accept an | |
867 | * older device ... but not too old. | |
868 | */ | |
41158c7e N |
869 | if (ev1 < mddev->bitmap->events_cleared) |
870 | return 0; | |
07d84d10 N |
871 | } else { |
872 | if (ev1 < mddev->events) | |
873 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
874 | return 0; | |
875 | } | |
41158c7e | 876 | |
1da177e4 | 877 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
878 | desc = sb->disks + rdev->desc_nr; |
879 | ||
880 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 881 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
882 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
883 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 884 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
885 | rdev->raid_disk = desc->raid_disk; |
886 | } | |
8ddf9efe N |
887 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
888 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 889 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 890 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
891 | return 0; |
892 | } | |
893 | ||
894 | /* | |
895 | * sync_super for 0.90.0 | |
896 | */ | |
897 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
898 | { | |
899 | mdp_super_t *sb; | |
1da177e4 LT |
900 | mdk_rdev_t *rdev2; |
901 | int next_spare = mddev->raid_disks; | |
19133a42 | 902 | |
1da177e4 LT |
903 | |
904 | /* make rdev->sb match mddev data.. | |
905 | * | |
906 | * 1/ zero out disks | |
907 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
908 | * 3/ any empty disks < next_spare become removed | |
909 | * | |
910 | * disks[0] gets initialised to REMOVED because | |
911 | * we cannot be sure from other fields if it has | |
912 | * been initialised or not. | |
913 | */ | |
914 | int i; | |
915 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
916 | ||
61181565 N |
917 | rdev->sb_size = MD_SB_BYTES; |
918 | ||
1da177e4 LT |
919 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
920 | ||
921 | memset(sb, 0, sizeof(*sb)); | |
922 | ||
923 | sb->md_magic = MD_SB_MAGIC; | |
924 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
925 | sb->patch_version = mddev->patch_version; |
926 | sb->gvalid_words = 0; /* ignored */ | |
927 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
928 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
929 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
930 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
931 | ||
932 | sb->ctime = mddev->ctime; | |
933 | sb->level = mddev->level; | |
934 | sb->size = mddev->size; | |
935 | sb->raid_disks = mddev->raid_disks; | |
936 | sb->md_minor = mddev->md_minor; | |
e691063a | 937 | sb->not_persistent = 0; |
1da177e4 LT |
938 | sb->utime = mddev->utime; |
939 | sb->state = 0; | |
940 | sb->events_hi = (mddev->events>>32); | |
941 | sb->events_lo = (u32)mddev->events; | |
942 | ||
f6705578 N |
943 | if (mddev->reshape_position == MaxSector) |
944 | sb->minor_version = 90; | |
945 | else { | |
946 | sb->minor_version = 91; | |
947 | sb->reshape_position = mddev->reshape_position; | |
948 | sb->new_level = mddev->new_level; | |
949 | sb->delta_disks = mddev->delta_disks; | |
950 | sb->new_layout = mddev->new_layout; | |
951 | sb->new_chunk = mddev->new_chunk; | |
952 | } | |
953 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
954 | if (mddev->in_sync) |
955 | { | |
956 | sb->recovery_cp = mddev->recovery_cp; | |
957 | sb->cp_events_hi = (mddev->events>>32); | |
958 | sb->cp_events_lo = (u32)mddev->events; | |
959 | if (mddev->recovery_cp == MaxSector) | |
960 | sb->state = (1<< MD_SB_CLEAN); | |
961 | } else | |
962 | sb->recovery_cp = 0; | |
963 | ||
964 | sb->layout = mddev->layout; | |
965 | sb->chunk_size = mddev->chunk_size; | |
966 | ||
a654b9d8 N |
967 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
968 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
969 | ||
1da177e4 | 970 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 971 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 972 | mdp_disk_t *d; |
86e6ffdd | 973 | int desc_nr; |
b2d444d7 N |
974 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
975 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 976 | desc_nr = rdev2->raid_disk; |
1da177e4 | 977 | else |
86e6ffdd | 978 | desc_nr = next_spare++; |
19133a42 | 979 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
980 | d = &sb->disks[rdev2->desc_nr]; |
981 | nr_disks++; | |
982 | d->number = rdev2->desc_nr; | |
983 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
984 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
985 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
986 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
987 | d->raid_disk = rdev2->raid_disk; |
988 | else | |
989 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 990 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 991 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 992 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
993 | d->state = (1<<MD_DISK_ACTIVE); |
994 | d->state |= (1<<MD_DISK_SYNC); | |
995 | active++; | |
996 | working++; | |
997 | } else { | |
998 | d->state = 0; | |
999 | spare++; | |
1000 | working++; | |
1001 | } | |
8ddf9efe N |
1002 | if (test_bit(WriteMostly, &rdev2->flags)) |
1003 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1004 | } |
1da177e4 LT |
1005 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1006 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1007 | mdp_disk_t *d = &sb->disks[i]; | |
1008 | if (d->state == 0 && d->number == 0) { | |
1009 | d->number = i; | |
1010 | d->raid_disk = i; | |
1011 | d->state = (1<<MD_DISK_REMOVED); | |
1012 | d->state |= (1<<MD_DISK_FAULTY); | |
1013 | failed++; | |
1014 | } | |
1015 | } | |
1016 | sb->nr_disks = nr_disks; | |
1017 | sb->active_disks = active; | |
1018 | sb->working_disks = working; | |
1019 | sb->failed_disks = failed; | |
1020 | sb->spare_disks = spare; | |
1021 | ||
1022 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1023 | sb->sb_csum = calc_sb_csum(sb); | |
1024 | } | |
1025 | ||
0cd17fec CW |
1026 | /* |
1027 | * rdev_size_change for 0.90.0 | |
1028 | */ | |
1029 | static unsigned long long | |
15f4a5fd | 1030 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1031 | { |
15f4a5fd | 1032 | if (num_sectors && num_sectors < rdev->mddev->size * 2) |
0cd17fec | 1033 | return 0; /* component must fit device */ |
0cd17fec CW |
1034 | if (rdev->mddev->bitmap_offset) |
1035 | return 0; /* can't move bitmap */ | |
0f420358 | 1036 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1037 | if (!num_sectors || num_sectors > rdev->sb_start) |
1038 | num_sectors = rdev->sb_start; | |
0f420358 | 1039 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1040 | rdev->sb_page); |
1041 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1042 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1043 | } |
1044 | ||
1045 | ||
1da177e4 LT |
1046 | /* |
1047 | * version 1 superblock | |
1048 | */ | |
1049 | ||
1c05b4bc | 1050 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1051 | { |
1c05b4bc N |
1052 | __le32 disk_csum; |
1053 | u32 csum; | |
1da177e4 LT |
1054 | unsigned long long newcsum; |
1055 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1056 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1057 | int i; |
1058 | ||
1059 | disk_csum = sb->sb_csum; | |
1060 | sb->sb_csum = 0; | |
1061 | newcsum = 0; | |
1062 | for (i=0; size>=4; size -= 4 ) | |
1063 | newcsum += le32_to_cpu(*isuper++); | |
1064 | ||
1065 | if (size == 2) | |
1c05b4bc | 1066 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1067 | |
1068 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1069 | sb->sb_csum = disk_csum; | |
1070 | return cpu_to_le32(csum); | |
1071 | } | |
1072 | ||
1073 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1074 | { | |
1075 | struct mdp_superblock_1 *sb; | |
1076 | int ret; | |
0f420358 | 1077 | sector_t sb_start; |
1da177e4 | 1078 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1079 | int bmask; |
1da177e4 LT |
1080 | |
1081 | /* | |
0f420358 | 1082 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1083 | * It is always aligned to a 4K boundary and |
1084 | * depeding on minor_version, it can be: | |
1085 | * 0: At least 8K, but less than 12K, from end of device | |
1086 | * 1: At start of device | |
1087 | * 2: 4K from start of device. | |
1088 | */ | |
1089 | switch(minor_version) { | |
1090 | case 0: | |
0f420358 AN |
1091 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1092 | sb_start -= 8*2; | |
1093 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1094 | break; |
1095 | case 1: | |
0f420358 | 1096 | sb_start = 0; |
1da177e4 LT |
1097 | break; |
1098 | case 2: | |
0f420358 | 1099 | sb_start = 8; |
1da177e4 LT |
1100 | break; |
1101 | default: | |
1102 | return -EINVAL; | |
1103 | } | |
0f420358 | 1104 | rdev->sb_start = sb_start; |
1da177e4 | 1105 | |
0002b271 N |
1106 | /* superblock is rarely larger than 1K, but it can be larger, |
1107 | * and it is safe to read 4k, so we do that | |
1108 | */ | |
1109 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1110 | if (ret) return ret; |
1111 | ||
1112 | ||
1113 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1114 | ||
1115 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1116 | sb->major_version != cpu_to_le32(1) || | |
1117 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1118 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1119 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1120 | return -EINVAL; |
1121 | ||
1122 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1123 | printk("md: invalid superblock checksum on %s\n", | |
1124 | bdevname(rdev->bdev,b)); | |
1125 | return -EINVAL; | |
1126 | } | |
1127 | if (le64_to_cpu(sb->data_size) < 10) { | |
1128 | printk("md: data_size too small on %s\n", | |
1129 | bdevname(rdev->bdev,b)); | |
1130 | return -EINVAL; | |
1131 | } | |
e11e93fa N |
1132 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1133 | if (sb->level != cpu_to_le32(1) && | |
1134 | sb->level != cpu_to_le32(4) && | |
1135 | sb->level != cpu_to_le32(5) && | |
1136 | sb->level != cpu_to_le32(6) && | |
1137 | sb->level != cpu_to_le32(10)) { | |
1138 | printk(KERN_WARNING | |
1139 | "md: bitmaps not supported for this level.\n"); | |
1140 | return -EINVAL; | |
1141 | } | |
1142 | } | |
1143 | ||
1da177e4 LT |
1144 | rdev->preferred_minor = 0xffff; |
1145 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1146 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1147 | |
0002b271 | 1148 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1149 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1150 | if (rdev->sb_size & bmask) |
a1801f85 N |
1151 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1152 | ||
1153 | if (minor_version | |
0f420358 | 1154 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1155 | return -EINVAL; |
0002b271 | 1156 | |
31b65a0d N |
1157 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1158 | rdev->desc_nr = -1; | |
1159 | else | |
1160 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1161 | ||
9a7b2b0f | 1162 | if (!refdev) { |
8ed75463 | 1163 | ret = 1; |
9a7b2b0f | 1164 | } else { |
1da177e4 LT |
1165 | __u64 ev1, ev2; |
1166 | struct mdp_superblock_1 *refsb = | |
1167 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1168 | ||
1169 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1170 | sb->level != refsb->level || | |
1171 | sb->layout != refsb->layout || | |
1172 | sb->chunksize != refsb->chunksize) { | |
1173 | printk(KERN_WARNING "md: %s has strangely different" | |
1174 | " superblock to %s\n", | |
1175 | bdevname(rdev->bdev,b), | |
1176 | bdevname(refdev->bdev,b2)); | |
1177 | return -EINVAL; | |
1178 | } | |
1179 | ev1 = le64_to_cpu(sb->events); | |
1180 | ev2 = le64_to_cpu(refsb->events); | |
1181 | ||
1182 | if (ev1 > ev2) | |
8ed75463 N |
1183 | ret = 1; |
1184 | else | |
1185 | ret = 0; | |
1da177e4 | 1186 | } |
a1801f85 | 1187 | if (minor_version) |
1da177e4 LT |
1188 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; |
1189 | else | |
0f420358 | 1190 | rdev->size = rdev->sb_start / 2; |
1da177e4 LT |
1191 | if (rdev->size < le64_to_cpu(sb->data_size)/2) |
1192 | return -EINVAL; | |
1193 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1194 | if (le32_to_cpu(sb->chunksize)) | |
1195 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1196 | |
1c05b4bc | 1197 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1198 | return -EINVAL; |
8ed75463 | 1199 | return ret; |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1203 | { | |
1204 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1205 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1206 | |
41158c7e | 1207 | rdev->raid_disk = -1; |
c5d79adb N |
1208 | clear_bit(Faulty, &rdev->flags); |
1209 | clear_bit(In_sync, &rdev->flags); | |
1210 | clear_bit(WriteMostly, &rdev->flags); | |
1211 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1212 | ||
1da177e4 LT |
1213 | if (mddev->raid_disks == 0) { |
1214 | mddev->major_version = 1; | |
1215 | mddev->patch_version = 0; | |
e691063a | 1216 | mddev->external = 0; |
1da177e4 LT |
1217 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1218 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1219 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1220 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1221 | mddev->clevel[0] = 0; |
1da177e4 LT |
1222 | mddev->layout = le32_to_cpu(sb->layout); |
1223 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1224 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1225 | mddev->events = ev1; |
9223214e | 1226 | mddev->bitmap_offset = 0; |
29fc7e3e | 1227 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1228 | |
1229 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1230 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1231 | ||
1232 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1233 | |
71c0805c | 1234 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1235 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1236 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1237 | |
f6705578 N |
1238 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1239 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1240 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1241 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1242 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1243 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1244 | } else { | |
1245 | mddev->reshape_position = MaxSector; | |
1246 | mddev->delta_disks = 0; | |
1247 | mddev->new_level = mddev->level; | |
1248 | mddev->new_layout = mddev->layout; | |
1249 | mddev->new_chunk = mddev->chunk_size; | |
1250 | } | |
1251 | ||
41158c7e N |
1252 | } else if (mddev->pers == NULL) { |
1253 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1254 | ++ev1; |
1255 | if (ev1 < mddev->events) | |
1256 | return -EINVAL; | |
41158c7e N |
1257 | } else if (mddev->bitmap) { |
1258 | /* If adding to array with a bitmap, then we can accept an | |
1259 | * older device, but not too old. | |
1260 | */ | |
41158c7e N |
1261 | if (ev1 < mddev->bitmap->events_cleared) |
1262 | return 0; | |
07d84d10 N |
1263 | } else { |
1264 | if (ev1 < mddev->events) | |
1265 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1266 | return 0; | |
1267 | } | |
1da177e4 LT |
1268 | if (mddev->level != LEVEL_MULTIPATH) { |
1269 | int role; | |
1da177e4 LT |
1270 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1271 | switch(role) { | |
1272 | case 0xffff: /* spare */ | |
1da177e4 LT |
1273 | break; |
1274 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1275 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1276 | break; |
1277 | default: | |
5fd6c1dc N |
1278 | if ((le32_to_cpu(sb->feature_map) & |
1279 | MD_FEATURE_RECOVERY_OFFSET)) | |
1280 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1281 | else | |
1282 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1283 | rdev->raid_disk = role; |
1284 | break; | |
1285 | } | |
8ddf9efe N |
1286 | if (sb->devflags & WriteMostly1) |
1287 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1288 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1289 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1290 | |
1da177e4 LT |
1291 | return 0; |
1292 | } | |
1293 | ||
1294 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1295 | { | |
1296 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1297 | mdk_rdev_t *rdev2; |
1298 | int max_dev, i; | |
1299 | /* make rdev->sb match mddev and rdev data. */ | |
1300 | ||
1301 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1302 | ||
1303 | sb->feature_map = 0; | |
1304 | sb->pad0 = 0; | |
5fd6c1dc | 1305 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1306 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1307 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1308 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1309 | ||
1310 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1311 | sb->events = cpu_to_le64(mddev->events); | |
1312 | if (mddev->in_sync) | |
1313 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1314 | else | |
1315 | sb->resync_offset = cpu_to_le64(0); | |
1316 | ||
1c05b4bc | 1317 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1318 | |
f0ca340c | 1319 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1320 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1321 | |
a654b9d8 N |
1322 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1323 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1324 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1325 | } |
5fd6c1dc N |
1326 | |
1327 | if (rdev->raid_disk >= 0 && | |
1328 | !test_bit(In_sync, &rdev->flags) && | |
1329 | rdev->recovery_offset > 0) { | |
1330 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1331 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1332 | } | |
1333 | ||
f6705578 N |
1334 | if (mddev->reshape_position != MaxSector) { |
1335 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1336 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1337 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1338 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1339 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1340 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1341 | } | |
a654b9d8 | 1342 | |
1da177e4 | 1343 | max_dev = 0; |
159ec1fc | 1344 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1345 | if (rdev2->desc_nr+1 > max_dev) |
1346 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1347 | |
1348 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1349 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1350 | for (i=0; i<max_dev;i++) |
1351 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1352 | ||
159ec1fc | 1353 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1354 | i = rdev2->desc_nr; |
b2d444d7 | 1355 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1356 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1357 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1358 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1359 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1360 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1361 | else |
1362 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1363 | } | |
1364 | ||
1da177e4 LT |
1365 | sb->sb_csum = calc_sb_1_csum(sb); |
1366 | } | |
1367 | ||
0cd17fec | 1368 | static unsigned long long |
15f4a5fd | 1369 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1370 | { |
1371 | struct mdp_superblock_1 *sb; | |
15f4a5fd AN |
1372 | sector_t max_sectors; |
1373 | if (num_sectors && num_sectors < rdev->mddev->size * 2) | |
0cd17fec | 1374 | return 0; /* component must fit device */ |
0f420358 | 1375 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1376 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1377 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1378 | max_sectors -= rdev->data_offset; | |
1379 | if (!num_sectors || num_sectors > max_sectors) | |
1380 | num_sectors = max_sectors; | |
0cd17fec CW |
1381 | } else if (rdev->mddev->bitmap_offset) { |
1382 | /* minor version 0 with bitmap we can't move */ | |
1383 | return 0; | |
1384 | } else { | |
1385 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1386 | sector_t sb_start; |
1387 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1388 | sb_start &= ~(sector_t)(4*2 - 1); | |
15f4a5fd AN |
1389 | max_sectors = rdev->size * 2 + sb_start - rdev->sb_start; |
1390 | if (!num_sectors || num_sectors > max_sectors) | |
1391 | num_sectors = max_sectors; | |
0f420358 | 1392 | rdev->sb_start = sb_start; |
0cd17fec CW |
1393 | } |
1394 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1395 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1396 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1397 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1398 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1399 | rdev->sb_page); |
1400 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1401 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1402 | } |
1da177e4 | 1403 | |
75c96f85 | 1404 | static struct super_type super_types[] = { |
1da177e4 LT |
1405 | [0] = { |
1406 | .name = "0.90.0", | |
1407 | .owner = THIS_MODULE, | |
0cd17fec CW |
1408 | .load_super = super_90_load, |
1409 | .validate_super = super_90_validate, | |
1410 | .sync_super = super_90_sync, | |
1411 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1412 | }, |
1413 | [1] = { | |
1414 | .name = "md-1", | |
1415 | .owner = THIS_MODULE, | |
0cd17fec CW |
1416 | .load_super = super_1_load, |
1417 | .validate_super = super_1_validate, | |
1418 | .sync_super = super_1_sync, | |
1419 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1420 | }, |
1421 | }; | |
1da177e4 LT |
1422 | |
1423 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1424 | { | |
7dd5e7c3 | 1425 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1426 | |
4b80991c N |
1427 | rcu_read_lock(); |
1428 | rdev_for_each_rcu(rdev, mddev1) | |
1429 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1430 | if (rdev->bdev->bd_contains == |
4b80991c N |
1431 | rdev2->bdev->bd_contains) { |
1432 | rcu_read_unlock(); | |
7dd5e7c3 | 1433 | return 1; |
4b80991c N |
1434 | } |
1435 | rcu_read_unlock(); | |
1da177e4 LT |
1436 | return 0; |
1437 | } | |
1438 | ||
1439 | static LIST_HEAD(pending_raid_disks); | |
1440 | ||
1441 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1442 | { | |
7dd5e7c3 | 1443 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1444 | struct kobject *ko; |
1edf80d3 | 1445 | char *s; |
5e55e2f5 | 1446 | int err; |
1da177e4 LT |
1447 | |
1448 | if (rdev->mddev) { | |
1449 | MD_BUG(); | |
1450 | return -EINVAL; | |
1451 | } | |
11e2ede0 DW |
1452 | |
1453 | /* prevent duplicates */ | |
1454 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1455 | return -EEXIST; | |
1456 | ||
2bf071bf N |
1457 | /* make sure rdev->size exceeds mddev->size */ |
1458 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1459 | if (mddev->pers) { |
1460 | /* Cannot change size, so fail | |
1461 | * If mddev->level <= 0, then we don't care | |
1462 | * about aligning sizes (e.g. linear) | |
1463 | */ | |
1464 | if (mddev->level > 0) | |
1465 | return -ENOSPC; | |
1466 | } else | |
2bf071bf N |
1467 | mddev->size = rdev->size; |
1468 | } | |
1da177e4 LT |
1469 | |
1470 | /* Verify rdev->desc_nr is unique. | |
1471 | * If it is -1, assign a free number, else | |
1472 | * check number is not in use | |
1473 | */ | |
1474 | if (rdev->desc_nr < 0) { | |
1475 | int choice = 0; | |
1476 | if (mddev->pers) choice = mddev->raid_disks; | |
1477 | while (find_rdev_nr(mddev, choice)) | |
1478 | choice++; | |
1479 | rdev->desc_nr = choice; | |
1480 | } else { | |
1481 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1482 | return -EBUSY; | |
1483 | } | |
19133a42 | 1484 | bdevname(rdev->bdev,b); |
649316b2 | 1485 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1486 | *s = '!'; |
649316b2 | 1487 | |
1da177e4 | 1488 | rdev->mddev = mddev; |
19133a42 | 1489 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1490 | |
b2d6db58 | 1491 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1492 | goto fail; |
86e6ffdd | 1493 | |
0762b8bd | 1494 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1495 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1496 | kobject_del(&rdev->kobj); | |
1497 | goto fail; | |
1498 | } | |
3c0ee63a N |
1499 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1500 | ||
4b80991c | 1501 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1502 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1503 | |
1504 | /* May as well allow recovery to be retried once */ | |
1505 | mddev->recovery_disabled = 0; | |
1da177e4 | 1506 | return 0; |
5e55e2f5 N |
1507 | |
1508 | fail: | |
1509 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1510 | b, mdname(mddev)); | |
1511 | return err; | |
1da177e4 LT |
1512 | } |
1513 | ||
177a99b2 | 1514 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1515 | { |
1516 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1517 | kobject_del(&rdev->kobj); | |
177a99b2 | 1518 | kobject_put(&rdev->kobj); |
5792a285 N |
1519 | } |
1520 | ||
1da177e4 LT |
1521 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1522 | { | |
1523 | char b[BDEVNAME_SIZE]; | |
1524 | if (!rdev->mddev) { | |
1525 | MD_BUG(); | |
1526 | return; | |
1527 | } | |
5463c790 | 1528 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1529 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1530 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1531 | rdev->mddev = NULL; | |
86e6ffdd | 1532 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1533 | sysfs_put(rdev->sysfs_state); |
1534 | rdev->sysfs_state = NULL; | |
5792a285 | 1535 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1536 | * writing to 'remove' to "dev/state". We also need |
1537 | * to delay it due to rcu usage. | |
5792a285 | 1538 | */ |
4b80991c | 1539 | synchronize_rcu(); |
177a99b2 N |
1540 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1541 | kobject_get(&rdev->kobj); | |
5792a285 | 1542 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1543 | } |
1544 | ||
1545 | /* | |
1546 | * prevent the device from being mounted, repartitioned or | |
1547 | * otherwise reused by a RAID array (or any other kernel | |
1548 | * subsystem), by bd_claiming the device. | |
1549 | */ | |
c5d79adb | 1550 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1551 | { |
1552 | int err = 0; | |
1553 | struct block_device *bdev; | |
1554 | char b[BDEVNAME_SIZE]; | |
1555 | ||
2e7b651d | 1556 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1557 | if (IS_ERR(bdev)) { |
1558 | printk(KERN_ERR "md: could not open %s.\n", | |
1559 | __bdevname(dev, b)); | |
1560 | return PTR_ERR(bdev); | |
1561 | } | |
c5d79adb | 1562 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1563 | if (err) { |
1564 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1565 | bdevname(bdev, b)); | |
9a1c3542 | 1566 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1567 | return err; |
1568 | } | |
c5d79adb N |
1569 | if (!shared) |
1570 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1571 | rdev->bdev = bdev; |
1572 | return err; | |
1573 | } | |
1574 | ||
1575 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1576 | { | |
1577 | struct block_device *bdev = rdev->bdev; | |
1578 | rdev->bdev = NULL; | |
1579 | if (!bdev) | |
1580 | MD_BUG(); | |
1581 | bd_release(bdev); | |
9a1c3542 | 1582 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1583 | } |
1584 | ||
1585 | void md_autodetect_dev(dev_t dev); | |
1586 | ||
1587 | static void export_rdev(mdk_rdev_t * rdev) | |
1588 | { | |
1589 | char b[BDEVNAME_SIZE]; | |
1590 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1591 | bdevname(rdev->bdev,b)); | |
1592 | if (rdev->mddev) | |
1593 | MD_BUG(); | |
1594 | free_disk_sb(rdev); | |
1da177e4 | 1595 | #ifndef MODULE |
d0fae18f N |
1596 | if (test_bit(AutoDetected, &rdev->flags)) |
1597 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1598 | #endif |
1599 | unlock_rdev(rdev); | |
86e6ffdd | 1600 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1601 | } |
1602 | ||
1603 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1604 | { | |
1605 | unbind_rdev_from_array(rdev); | |
1606 | export_rdev(rdev); | |
1607 | } | |
1608 | ||
1609 | static void export_array(mddev_t *mddev) | |
1610 | { | |
159ec1fc | 1611 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1612 | |
d089c6af | 1613 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1614 | if (!rdev->mddev) { |
1615 | MD_BUG(); | |
1616 | continue; | |
1617 | } | |
1618 | kick_rdev_from_array(rdev); | |
1619 | } | |
1620 | if (!list_empty(&mddev->disks)) | |
1621 | MD_BUG(); | |
1622 | mddev->raid_disks = 0; | |
1623 | mddev->major_version = 0; | |
1624 | } | |
1625 | ||
1626 | static void print_desc(mdp_disk_t *desc) | |
1627 | { | |
1628 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1629 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1630 | } | |
1631 | ||
cd2ac932 | 1632 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1633 | { |
1634 | int i; | |
1635 | ||
1636 | printk(KERN_INFO | |
1637 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1638 | sb->major_version, sb->minor_version, sb->patch_version, | |
1639 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1640 | sb->ctime); | |
1641 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1642 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1643 | sb->md_minor, sb->layout, sb->chunk_size); | |
1644 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1645 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1646 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1647 | sb->failed_disks, sb->spare_disks, | |
1648 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1649 | ||
1650 | printk(KERN_INFO); | |
1651 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1652 | mdp_disk_t *desc; | |
1653 | ||
1654 | desc = sb->disks + i; | |
1655 | if (desc->number || desc->major || desc->minor || | |
1656 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1657 | printk(" D %2d: ", i); | |
1658 | print_desc(desc); | |
1659 | } | |
1660 | } | |
1661 | printk(KERN_INFO "md: THIS: "); | |
1662 | print_desc(&sb->this_disk); | |
cd2ac932 | 1663 | } |
1da177e4 | 1664 | |
cd2ac932 CR |
1665 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1666 | { | |
1667 | __u8 *uuid; | |
1668 | ||
1669 | uuid = sb->set_uuid; | |
1670 | printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1671 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1672 | KERN_INFO "md: Name: \"%s\" CT:%llu\n", | |
1673 | le32_to_cpu(sb->major_version), | |
1674 | le32_to_cpu(sb->feature_map), | |
1675 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1676 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1677 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1678 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1679 | sb->set_name, | |
1680 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1681 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1682 | ||
1683 | uuid = sb->device_uuid; | |
1684 | printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
1685 | " RO:%llu\n" | |
1686 | KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" | |
1687 | ":%02x%02x%02x%02x%02x%02x\n" | |
1688 | KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1689 | KERN_INFO "md: (MaxDev:%u) \n", | |
1690 | le32_to_cpu(sb->level), | |
1691 | (unsigned long long)le64_to_cpu(sb->size), | |
1692 | le32_to_cpu(sb->raid_disks), | |
1693 | le32_to_cpu(sb->layout), | |
1694 | le32_to_cpu(sb->chunksize), | |
1695 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1696 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1697 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1698 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1699 | le32_to_cpu(sb->dev_number), | |
1700 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1701 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1702 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1703 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1704 | sb->devflags, | |
1705 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1706 | (unsigned long long)le64_to_cpu(sb->events), | |
1707 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1708 | le32_to_cpu(sb->sb_csum), | |
1709 | le32_to_cpu(sb->max_dev) | |
1710 | ); | |
1da177e4 LT |
1711 | } |
1712 | ||
cd2ac932 | 1713 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1714 | { |
1715 | char b[BDEVNAME_SIZE]; | |
1716 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1717 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1718 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1719 | rdev->desc_nr); | |
1da177e4 | 1720 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1721 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1722 | switch (major_version) { | |
1723 | case 0: | |
1724 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1725 | break; | |
1726 | case 1: | |
1727 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1728 | break; | |
1729 | } | |
1da177e4 LT |
1730 | } else |
1731 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1732 | } | |
1733 | ||
5e56341d | 1734 | static void md_print_devices(void) |
1da177e4 | 1735 | { |
159ec1fc | 1736 | struct list_head *tmp; |
1da177e4 LT |
1737 | mdk_rdev_t *rdev; |
1738 | mddev_t *mddev; | |
1739 | char b[BDEVNAME_SIZE]; | |
1740 | ||
1741 | printk("\n"); | |
1742 | printk("md: **********************************\n"); | |
1743 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1744 | printk("md: **********************************\n"); | |
29ac4aa3 | 1745 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1746 | |
32a7627c N |
1747 | if (mddev->bitmap) |
1748 | bitmap_print_sb(mddev->bitmap); | |
1749 | else | |
1750 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 1751 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
1752 | printk("<%s>", bdevname(rdev->bdev,b)); |
1753 | printk("\n"); | |
1754 | ||
159ec1fc | 1755 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 1756 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
1757 | } |
1758 | printk("md: **********************************\n"); | |
1759 | printk("\n"); | |
1760 | } | |
1761 | ||
1762 | ||
42543769 | 1763 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1764 | { |
42543769 N |
1765 | /* Update each superblock (in-memory image), but |
1766 | * if we are allowed to, skip spares which already | |
1767 | * have the right event counter, or have one earlier | |
1768 | * (which would mean they aren't being marked as dirty | |
1769 | * with the rest of the array) | |
1770 | */ | |
1da177e4 | 1771 | mdk_rdev_t *rdev; |
1da177e4 | 1772 | |
159ec1fc | 1773 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
1774 | if (rdev->sb_events == mddev->events || |
1775 | (nospares && | |
1776 | rdev->raid_disk < 0 && | |
1777 | (rdev->sb_events&1)==0 && | |
1778 | rdev->sb_events+1 == mddev->events)) { | |
1779 | /* Don't update this superblock */ | |
1780 | rdev->sb_loaded = 2; | |
1781 | } else { | |
1782 | super_types[mddev->major_version]. | |
1783 | sync_super(mddev, rdev); | |
1784 | rdev->sb_loaded = 1; | |
1785 | } | |
1da177e4 LT |
1786 | } |
1787 | } | |
1788 | ||
850b2b42 | 1789 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1790 | { |
1da177e4 | 1791 | mdk_rdev_t *rdev; |
06d91a5f | 1792 | int sync_req; |
42543769 | 1793 | int nospares = 0; |
1da177e4 | 1794 | |
8377bc80 N |
1795 | if (mddev->external) |
1796 | return; | |
1da177e4 | 1797 | repeat: |
a9701a30 | 1798 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1799 | |
850b2b42 N |
1800 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1801 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1802 | force_change = 1; | |
1803 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1804 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1805 | * though if events isn't the right even/odd, we will have to do | |
1806 | * spares after all | |
1807 | */ | |
1808 | nospares = 1; | |
1809 | if (force_change) | |
1810 | nospares = 0; | |
1811 | if (mddev->degraded) | |
84692195 N |
1812 | /* If the array is degraded, then skipping spares is both |
1813 | * dangerous and fairly pointless. | |
1814 | * Dangerous because a device that was removed from the array | |
1815 | * might have a event_count that still looks up-to-date, | |
1816 | * so it can be re-added without a resync. | |
1817 | * Pointless because if there are any spares to skip, | |
1818 | * then a recovery will happen and soon that array won't | |
1819 | * be degraded any more and the spare can go back to sleep then. | |
1820 | */ | |
850b2b42 | 1821 | nospares = 0; |
84692195 | 1822 | |
06d91a5f | 1823 | sync_req = mddev->in_sync; |
1da177e4 | 1824 | mddev->utime = get_seconds(); |
42543769 N |
1825 | |
1826 | /* If this is just a dirty<->clean transition, and the array is clean | |
1827 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1828 | if (nospares |
42543769 | 1829 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1830 | && (mddev->events & 1) |
1831 | && mddev->events != 1) | |
42543769 N |
1832 | mddev->events--; |
1833 | else { | |
1834 | /* otherwise we have to go forward and ... */ | |
1835 | mddev->events ++; | |
1836 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1837 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1838 | if ((mddev->events&1)==0) { | |
1839 | mddev->events++; | |
1840 | nospares = 0; | |
1841 | } | |
1842 | } else { | |
1843 | /* otherwise insist on an even 'events' (for clean states) */ | |
1844 | if ((mddev->events&1)) { | |
1845 | mddev->events++; | |
1846 | nospares = 0; | |
1847 | } | |
1848 | } | |
1849 | } | |
1da177e4 LT |
1850 | |
1851 | if (!mddev->events) { | |
1852 | /* | |
1853 | * oops, this 64-bit counter should never wrap. | |
1854 | * Either we are in around ~1 trillion A.C., assuming | |
1855 | * 1 reboot per second, or we have a bug: | |
1856 | */ | |
1857 | MD_BUG(); | |
1858 | mddev->events --; | |
1859 | } | |
1da177e4 LT |
1860 | |
1861 | /* | |
1862 | * do not write anything to disk if using | |
1863 | * nonpersistent superblocks | |
1864 | */ | |
06d91a5f | 1865 | if (!mddev->persistent) { |
e691063a N |
1866 | if (!mddev->external) |
1867 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1868 | ||
a9701a30 | 1869 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1870 | wake_up(&mddev->sb_wait); |
1da177e4 | 1871 | return; |
06d91a5f | 1872 | } |
e691063a | 1873 | sync_sbs(mddev, nospares); |
a9701a30 | 1874 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1875 | |
1876 | dprintk(KERN_INFO | |
1877 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1878 | mdname(mddev),mddev->in_sync); | |
1879 | ||
4ad13663 | 1880 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 1881 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
1882 | char b[BDEVNAME_SIZE]; |
1883 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1884 | if (rdev->sb_loaded != 1) |
1885 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1886 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1887 | dprintk("(skipping faulty "); |
1888 | ||
1889 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1890 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1891 | md_super_write(mddev,rdev, |
0f420358 | 1892 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
1893 | rdev->sb_page); |
1894 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1895 | bdevname(rdev->bdev,b), | |
0f420358 | 1896 | (unsigned long long)rdev->sb_start); |
42543769 | 1897 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1898 | |
1da177e4 LT |
1899 | } else |
1900 | dprintk(")\n"); | |
7bfa19f2 | 1901 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1902 | /* only need to write one superblock... */ |
1903 | break; | |
1904 | } | |
a9701a30 | 1905 | md_super_wait(mddev); |
850b2b42 | 1906 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1907 | |
a9701a30 | 1908 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1909 | if (mddev->in_sync != sync_req || |
1910 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1911 | /* have to write it out again */ |
a9701a30 | 1912 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1913 | goto repeat; |
1914 | } | |
850b2b42 | 1915 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1916 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1917 | wake_up(&mddev->sb_wait); |
06d91a5f | 1918 | |
1da177e4 LT |
1919 | } |
1920 | ||
7f6ce769 | 1921 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
1922 | * We want to accept with case. For this we use cmd_match. |
1923 | */ | |
1924 | static int cmd_match(const char *cmd, const char *str) | |
1925 | { | |
1926 | /* See if cmd, written into a sysfs file, matches | |
1927 | * str. They must either be the same, or cmd can | |
1928 | * have a trailing newline | |
1929 | */ | |
1930 | while (*cmd && *str && *cmd == *str) { | |
1931 | cmd++; | |
1932 | str++; | |
1933 | } | |
1934 | if (*cmd == '\n') | |
1935 | cmd++; | |
1936 | if (*str || *cmd) | |
1937 | return 0; | |
1938 | return 1; | |
1939 | } | |
1940 | ||
86e6ffdd N |
1941 | struct rdev_sysfs_entry { |
1942 | struct attribute attr; | |
1943 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1944 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1945 | }; | |
1946 | ||
1947 | static ssize_t | |
96de1e66 | 1948 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1949 | { |
1950 | char *sep = ""; | |
20a49ff6 | 1951 | size_t len = 0; |
86e6ffdd | 1952 | |
b2d444d7 | 1953 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1954 | len+= sprintf(page+len, "%sfaulty",sep); |
1955 | sep = ","; | |
1956 | } | |
b2d444d7 | 1957 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1958 | len += sprintf(page+len, "%sin_sync",sep); |
1959 | sep = ","; | |
1960 | } | |
f655675b N |
1961 | if (test_bit(WriteMostly, &rdev->flags)) { |
1962 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1963 | sep = ","; | |
1964 | } | |
6bfe0b49 DW |
1965 | if (test_bit(Blocked, &rdev->flags)) { |
1966 | len += sprintf(page+len, "%sblocked", sep); | |
1967 | sep = ","; | |
1968 | } | |
b2d444d7 N |
1969 | if (!test_bit(Faulty, &rdev->flags) && |
1970 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1971 | len += sprintf(page+len, "%sspare", sep); |
1972 | sep = ","; | |
1973 | } | |
1974 | return len+sprintf(page+len, "\n"); | |
1975 | } | |
1976 | ||
45dc2de1 N |
1977 | static ssize_t |
1978 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1979 | { | |
1980 | /* can write | |
1981 | * faulty - simulates and error | |
1982 | * remove - disconnects the device | |
f655675b N |
1983 | * writemostly - sets write_mostly |
1984 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
1985 | * blocked - sets the Blocked flag |
1986 | * -blocked - clears the Blocked flag | |
45dc2de1 N |
1987 | */ |
1988 | int err = -EINVAL; | |
1989 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1990 | md_error(rdev->mddev, rdev); | |
1991 | err = 0; | |
1992 | } else if (cmd_match(buf, "remove")) { | |
1993 | if (rdev->raid_disk >= 0) | |
1994 | err = -EBUSY; | |
1995 | else { | |
1996 | mddev_t *mddev = rdev->mddev; | |
1997 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1998 | if (mddev->pers) |
1999 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2000 | md_new_event(mddev); |
2001 | err = 0; | |
2002 | } | |
f655675b N |
2003 | } else if (cmd_match(buf, "writemostly")) { |
2004 | set_bit(WriteMostly, &rdev->flags); | |
2005 | err = 0; | |
2006 | } else if (cmd_match(buf, "-writemostly")) { | |
2007 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2008 | err = 0; |
2009 | } else if (cmd_match(buf, "blocked")) { | |
2010 | set_bit(Blocked, &rdev->flags); | |
2011 | err = 0; | |
2012 | } else if (cmd_match(buf, "-blocked")) { | |
2013 | clear_bit(Blocked, &rdev->flags); | |
2014 | wake_up(&rdev->blocked_wait); | |
2015 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2016 | md_wakeup_thread(rdev->mddev->thread); | |
2017 | ||
f655675b | 2018 | err = 0; |
45dc2de1 | 2019 | } |
3c0ee63a N |
2020 | if (!err && rdev->sysfs_state) |
2021 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
2022 | return err ? err : len; |
2023 | } | |
80ca3a44 N |
2024 | static struct rdev_sysfs_entry rdev_state = |
2025 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2026 | |
4dbcdc75 N |
2027 | static ssize_t |
2028 | errors_show(mdk_rdev_t *rdev, char *page) | |
2029 | { | |
2030 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2031 | } | |
2032 | ||
2033 | static ssize_t | |
2034 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2035 | { | |
2036 | char *e; | |
2037 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2038 | if (*buf && (*e == 0 || *e == '\n')) { | |
2039 | atomic_set(&rdev->corrected_errors, n); | |
2040 | return len; | |
2041 | } | |
2042 | return -EINVAL; | |
2043 | } | |
2044 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2045 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2046 | |
014236d2 N |
2047 | static ssize_t |
2048 | slot_show(mdk_rdev_t *rdev, char *page) | |
2049 | { | |
2050 | if (rdev->raid_disk < 0) | |
2051 | return sprintf(page, "none\n"); | |
2052 | else | |
2053 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2054 | } | |
2055 | ||
2056 | static ssize_t | |
2057 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2058 | { | |
2059 | char *e; | |
c303da6d N |
2060 | int err; |
2061 | char nm[20]; | |
014236d2 N |
2062 | int slot = simple_strtoul(buf, &e, 10); |
2063 | if (strncmp(buf, "none", 4)==0) | |
2064 | slot = -1; | |
2065 | else if (e==buf || (*e && *e!= '\n')) | |
2066 | return -EINVAL; | |
6c2fce2e | 2067 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2068 | /* Setting 'slot' on an active array requires also |
2069 | * updating the 'rd%d' link, and communicating | |
2070 | * with the personality with ->hot_*_disk. | |
2071 | * For now we only support removing | |
2072 | * failed/spare devices. This normally happens automatically, | |
2073 | * but not when the metadata is externally managed. | |
2074 | */ | |
c303da6d N |
2075 | if (rdev->raid_disk == -1) |
2076 | return -EEXIST; | |
2077 | /* personality does all needed checks */ | |
2078 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2079 | return -EINVAL; | |
2080 | err = rdev->mddev->pers-> | |
2081 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2082 | if (err) | |
2083 | return err; | |
2084 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2085 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2086 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2087 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2088 | } else if (rdev->mddev->pers) { |
2089 | mdk_rdev_t *rdev2; | |
6c2fce2e NB |
2090 | /* Activating a spare .. or possibly reactivating |
2091 | * if we every get bitmaps working here. | |
2092 | */ | |
2093 | ||
2094 | if (rdev->raid_disk != -1) | |
2095 | return -EBUSY; | |
2096 | ||
2097 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2098 | return -EINVAL; | |
2099 | ||
159ec1fc | 2100 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2101 | if (rdev2->raid_disk == slot) |
2102 | return -EEXIST; | |
2103 | ||
2104 | rdev->raid_disk = slot; | |
2105 | if (test_bit(In_sync, &rdev->flags)) | |
2106 | rdev->saved_raid_disk = slot; | |
2107 | else | |
2108 | rdev->saved_raid_disk = -1; | |
2109 | err = rdev->mddev->pers-> | |
2110 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2111 | if (err) { |
6c2fce2e | 2112 | rdev->raid_disk = -1; |
6c2fce2e | 2113 | return err; |
52664732 | 2114 | } else |
3c0ee63a | 2115 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2116 | sprintf(nm, "rd%d", rdev->raid_disk); |
2117 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2118 | printk(KERN_WARNING | |
2119 | "md: cannot register " | |
2120 | "%s for %s\n", | |
2121 | nm, mdname(rdev->mddev)); | |
2122 | ||
2123 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2124 | } else { |
2125 | if (slot >= rdev->mddev->raid_disks) | |
2126 | return -ENOSPC; | |
2127 | rdev->raid_disk = slot; | |
2128 | /* assume it is working */ | |
c5d79adb N |
2129 | clear_bit(Faulty, &rdev->flags); |
2130 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2131 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2132 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2133 | } |
014236d2 N |
2134 | return len; |
2135 | } | |
2136 | ||
2137 | ||
2138 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2139 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2140 | |
93c8cad0 N |
2141 | static ssize_t |
2142 | offset_show(mdk_rdev_t *rdev, char *page) | |
2143 | { | |
6961ece4 | 2144 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2145 | } |
2146 | ||
2147 | static ssize_t | |
2148 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2149 | { | |
2150 | char *e; | |
2151 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2152 | if (e==buf || (*e && *e != '\n')) | |
2153 | return -EINVAL; | |
8ed0a521 | 2154 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2155 | return -EBUSY; |
c5d79adb N |
2156 | if (rdev->size && rdev->mddev->external) |
2157 | /* Must set offset before size, so overlap checks | |
2158 | * can be sane */ | |
2159 | return -EBUSY; | |
93c8cad0 N |
2160 | rdev->data_offset = offset; |
2161 | return len; | |
2162 | } | |
2163 | ||
2164 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2165 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2166 | |
83303b61 N |
2167 | static ssize_t |
2168 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2169 | { | |
2170 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
2171 | } | |
2172 | ||
c5d79adb N |
2173 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2174 | { | |
2175 | /* check if two start/length pairs overlap */ | |
2176 | if (s1+l1 <= s2) | |
2177 | return 0; | |
2178 | if (s2+l2 <= s1) | |
2179 | return 0; | |
2180 | return 1; | |
2181 | } | |
2182 | ||
83303b61 N |
2183 | static ssize_t |
2184 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2185 | { | |
d7027458 | 2186 | unsigned long long size; |
c5d79adb | 2187 | unsigned long long oldsize = rdev->size; |
27c529bb N |
2188 | mddev_t *my_mddev = rdev->mddev; |
2189 | ||
d7027458 NB |
2190 | if (strict_strtoull(buf, 10, &size) < 0) |
2191 | return -EINVAL; | |
0cd17fec | 2192 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 NB |
2193 | if (my_mddev->persistent) { |
2194 | size = super_types[my_mddev->major_version]. | |
15f4a5fd | 2195 | rdev_size_change(rdev, size * 2); |
0cd17fec CW |
2196 | if (!size) |
2197 | return -EBUSY; | |
2198 | } else if (!size) { | |
2199 | size = (rdev->bdev->bd_inode->i_size >> 10); | |
2200 | size -= rdev->data_offset/2; | |
2201 | } | |
0cd17fec | 2202 | } |
7d3c6f87 CW |
2203 | if (size < my_mddev->size) |
2204 | return -EINVAL; /* component must fit device */ | |
0cd17fec | 2205 | |
83303b61 | 2206 | rdev->size = size; |
d7027458 | 2207 | if (size > oldsize && my_mddev->external) { |
c5d79adb N |
2208 | /* need to check that all other rdevs with the same ->bdev |
2209 | * do not overlap. We need to unlock the mddev to avoid | |
2210 | * a deadlock. We have already changed rdev->size, and if | |
2211 | * we have to change it back, we will have the lock again. | |
2212 | */ | |
2213 | mddev_t *mddev; | |
2214 | int overlap = 0; | |
159ec1fc | 2215 | struct list_head *tmp; |
c5d79adb | 2216 | |
27c529bb | 2217 | mddev_unlock(my_mddev); |
29ac4aa3 | 2218 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2219 | mdk_rdev_t *rdev2; |
2220 | ||
2221 | mddev_lock(mddev); | |
159ec1fc | 2222 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2223 | if (test_bit(AllReserved, &rdev2->flags) || |
2224 | (rdev->bdev == rdev2->bdev && | |
2225 | rdev != rdev2 && | |
d07bd3bc AN |
2226 | overlaps(rdev->data_offset, rdev->size * 2, |
2227 | rdev2->data_offset, | |
2228 | rdev2->size * 2))) { | |
c5d79adb N |
2229 | overlap = 1; |
2230 | break; | |
2231 | } | |
2232 | mddev_unlock(mddev); | |
2233 | if (overlap) { | |
2234 | mddev_put(mddev); | |
2235 | break; | |
2236 | } | |
2237 | } | |
27c529bb | 2238 | mddev_lock(my_mddev); |
c5d79adb N |
2239 | if (overlap) { |
2240 | /* Someone else could have slipped in a size | |
2241 | * change here, but doing so is just silly. | |
2242 | * We put oldsize back because we *know* it is | |
2243 | * safe, and trust userspace not to race with | |
2244 | * itself | |
2245 | */ | |
2246 | rdev->size = oldsize; | |
2247 | return -EBUSY; | |
2248 | } | |
2249 | } | |
83303b61 N |
2250 | return len; |
2251 | } | |
2252 | ||
2253 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2254 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2255 | |
86e6ffdd N |
2256 | static struct attribute *rdev_default_attrs[] = { |
2257 | &rdev_state.attr, | |
4dbcdc75 | 2258 | &rdev_errors.attr, |
014236d2 | 2259 | &rdev_slot.attr, |
93c8cad0 | 2260 | &rdev_offset.attr, |
83303b61 | 2261 | &rdev_size.attr, |
86e6ffdd N |
2262 | NULL, |
2263 | }; | |
2264 | static ssize_t | |
2265 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2266 | { | |
2267 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2268 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2269 | mddev_t *mddev = rdev->mddev; |
2270 | ssize_t rv; | |
86e6ffdd N |
2271 | |
2272 | if (!entry->show) | |
2273 | return -EIO; | |
27c529bb N |
2274 | |
2275 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2276 | if (!rv) { | |
2277 | if (rdev->mddev == NULL) | |
2278 | rv = -EBUSY; | |
2279 | else | |
2280 | rv = entry->show(rdev, page); | |
2281 | mddev_unlock(mddev); | |
2282 | } | |
2283 | return rv; | |
86e6ffdd N |
2284 | } |
2285 | ||
2286 | static ssize_t | |
2287 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2288 | const char *page, size_t length) | |
2289 | { | |
2290 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2291 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2292 | ssize_t rv; |
2293 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2294 | |
2295 | if (!entry->store) | |
2296 | return -EIO; | |
67463acb N |
2297 | if (!capable(CAP_SYS_ADMIN)) |
2298 | return -EACCES; | |
27c529bb | 2299 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2300 | if (!rv) { |
27c529bb N |
2301 | if (rdev->mddev == NULL) |
2302 | rv = -EBUSY; | |
2303 | else | |
2304 | rv = entry->store(rdev, page, length); | |
6a51830e | 2305 | mddev_unlock(mddev); |
ca388059 N |
2306 | } |
2307 | return rv; | |
86e6ffdd N |
2308 | } |
2309 | ||
2310 | static void rdev_free(struct kobject *ko) | |
2311 | { | |
2312 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2313 | kfree(rdev); | |
2314 | } | |
2315 | static struct sysfs_ops rdev_sysfs_ops = { | |
2316 | .show = rdev_attr_show, | |
2317 | .store = rdev_attr_store, | |
2318 | }; | |
2319 | static struct kobj_type rdev_ktype = { | |
2320 | .release = rdev_free, | |
2321 | .sysfs_ops = &rdev_sysfs_ops, | |
2322 | .default_attrs = rdev_default_attrs, | |
2323 | }; | |
2324 | ||
1da177e4 LT |
2325 | /* |
2326 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2327 | * | |
2328 | * mark the device faulty if: | |
2329 | * | |
2330 | * - the device is nonexistent (zero size) | |
2331 | * - the device has no valid superblock | |
2332 | * | |
2333 | * a faulty rdev _never_ has rdev->sb set. | |
2334 | */ | |
2335 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2336 | { | |
2337 | char b[BDEVNAME_SIZE]; | |
2338 | int err; | |
2339 | mdk_rdev_t *rdev; | |
2340 | sector_t size; | |
2341 | ||
9ffae0cf | 2342 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2343 | if (!rdev) { |
2344 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2345 | return ERR_PTR(-ENOMEM); | |
2346 | } | |
1da177e4 LT |
2347 | |
2348 | if ((err = alloc_disk_sb(rdev))) | |
2349 | goto abort_free; | |
2350 | ||
c5d79adb | 2351 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2352 | if (err) |
2353 | goto abort_free; | |
2354 | ||
f9cb074b | 2355 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2356 | |
1da177e4 | 2357 | rdev->desc_nr = -1; |
2b6e8459 | 2358 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2359 | rdev->raid_disk = -1; |
b2d444d7 | 2360 | rdev->flags = 0; |
1da177e4 | 2361 | rdev->data_offset = 0; |
42543769 | 2362 | rdev->sb_events = 0; |
1da177e4 | 2363 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2364 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2365 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2366 | |
2367 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2368 | if (!size) { | |
2369 | printk(KERN_WARNING | |
2370 | "md: %s has zero or unknown size, marking faulty!\n", | |
2371 | bdevname(rdev->bdev,b)); | |
2372 | err = -EINVAL; | |
2373 | goto abort_free; | |
2374 | } | |
2375 | ||
2376 | if (super_format >= 0) { | |
2377 | err = super_types[super_format]. | |
2378 | load_super(rdev, NULL, super_minor); | |
2379 | if (err == -EINVAL) { | |
df968c4e N |
2380 | printk(KERN_WARNING |
2381 | "md: %s does not have a valid v%d.%d " | |
2382 | "superblock, not importing!\n", | |
2383 | bdevname(rdev->bdev,b), | |
2384 | super_format, super_minor); | |
1da177e4 LT |
2385 | goto abort_free; |
2386 | } | |
2387 | if (err < 0) { | |
2388 | printk(KERN_WARNING | |
2389 | "md: could not read %s's sb, not importing!\n", | |
2390 | bdevname(rdev->bdev,b)); | |
2391 | goto abort_free; | |
2392 | } | |
2393 | } | |
6bfe0b49 | 2394 | |
1da177e4 | 2395 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2396 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2397 | |
2398 | return rdev; | |
2399 | ||
2400 | abort_free: | |
2401 | if (rdev->sb_page) { | |
2402 | if (rdev->bdev) | |
2403 | unlock_rdev(rdev); | |
2404 | free_disk_sb(rdev); | |
2405 | } | |
2406 | kfree(rdev); | |
2407 | return ERR_PTR(err); | |
2408 | } | |
2409 | ||
2410 | /* | |
2411 | * Check a full RAID array for plausibility | |
2412 | */ | |
2413 | ||
2414 | ||
a757e64c | 2415 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2416 | { |
2417 | int i; | |
159ec1fc | 2418 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2419 | char b[BDEVNAME_SIZE]; |
2420 | ||
2421 | freshest = NULL; | |
d089c6af | 2422 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2423 | switch (super_types[mddev->major_version]. |
2424 | load_super(rdev, freshest, mddev->minor_version)) { | |
2425 | case 1: | |
2426 | freshest = rdev; | |
2427 | break; | |
2428 | case 0: | |
2429 | break; | |
2430 | default: | |
2431 | printk( KERN_ERR \ | |
2432 | "md: fatal superblock inconsistency in %s" | |
2433 | " -- removing from array\n", | |
2434 | bdevname(rdev->bdev,b)); | |
2435 | kick_rdev_from_array(rdev); | |
2436 | } | |
2437 | ||
2438 | ||
2439 | super_types[mddev->major_version]. | |
2440 | validate_super(mddev, freshest); | |
2441 | ||
2442 | i = 0; | |
d089c6af | 2443 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2444 | if (rdev != freshest) |
2445 | if (super_types[mddev->major_version]. | |
2446 | validate_super(mddev, rdev)) { | |
2447 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2448 | " from array!\n", | |
2449 | bdevname(rdev->bdev,b)); | |
2450 | kick_rdev_from_array(rdev); | |
2451 | continue; | |
2452 | } | |
2453 | if (mddev->level == LEVEL_MULTIPATH) { | |
2454 | rdev->desc_nr = i++; | |
2455 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2456 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2457 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2458 | rdev->raid_disk = -1; | |
2459 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2460 | } |
2461 | } | |
2462 | ||
2463 | ||
2464 | ||
2465 | if (mddev->recovery_cp != MaxSector && | |
2466 | mddev->level >= 1) | |
2467 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2468 | " -- starting background reconstruction\n", | |
2469 | mdname(mddev)); | |
2470 | ||
1da177e4 LT |
2471 | } |
2472 | ||
19052c0e N |
2473 | static void md_safemode_timeout(unsigned long data); |
2474 | ||
16f17b39 N |
2475 | static ssize_t |
2476 | safe_delay_show(mddev_t *mddev, char *page) | |
2477 | { | |
2478 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2479 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2480 | } | |
2481 | static ssize_t | |
2482 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2483 | { | |
2484 | int scale=1; | |
2485 | int dot=0; | |
2486 | int i; | |
2487 | unsigned long msec; | |
2488 | char buf[30]; | |
97ce0a7f | 2489 | |
16f17b39 N |
2490 | /* remove a period, and count digits after it */ |
2491 | if (len >= sizeof(buf)) | |
2492 | return -EINVAL; | |
97ce0a7f | 2493 | strlcpy(buf, cbuf, sizeof(buf)); |
16f17b39 N |
2494 | for (i=0; i<len; i++) { |
2495 | if (dot) { | |
2496 | if (isdigit(buf[i])) { | |
2497 | buf[i-1] = buf[i]; | |
2498 | scale *= 10; | |
2499 | } | |
2500 | buf[i] = 0; | |
2501 | } else if (buf[i] == '.') { | |
2502 | dot=1; | |
2503 | buf[i] = 0; | |
2504 | } | |
2505 | } | |
97ce0a7f | 2506 | if (strict_strtoul(buf, 10, &msec) < 0) |
16f17b39 N |
2507 | return -EINVAL; |
2508 | msec = (msec * 1000) / scale; | |
2509 | if (msec == 0) | |
2510 | mddev->safemode_delay = 0; | |
2511 | else { | |
19052c0e | 2512 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2513 | mddev->safemode_delay = (msec*HZ)/1000; |
2514 | if (mddev->safemode_delay == 0) | |
2515 | mddev->safemode_delay = 1; | |
19052c0e N |
2516 | if (mddev->safemode_delay < old_delay) |
2517 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2518 | } |
2519 | return len; | |
2520 | } | |
2521 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2522 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2523 | |
eae1701f | 2524 | static ssize_t |
96de1e66 | 2525 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2526 | { |
2604b703 | 2527 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2528 | if (p) |
eae1701f | 2529 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2530 | else if (mddev->clevel[0]) |
2531 | return sprintf(page, "%s\n", mddev->clevel); | |
2532 | else if (mddev->level != LEVEL_NONE) | |
2533 | return sprintf(page, "%d\n", mddev->level); | |
2534 | else | |
2535 | return 0; | |
eae1701f N |
2536 | } |
2537 | ||
d9d166c2 N |
2538 | static ssize_t |
2539 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2540 | { | |
20a49ff6 | 2541 | ssize_t rv = len; |
d9d166c2 N |
2542 | if (mddev->pers) |
2543 | return -EBUSY; | |
2544 | if (len == 0) | |
2545 | return 0; | |
2546 | if (len >= sizeof(mddev->clevel)) | |
2547 | return -ENOSPC; | |
2548 | strncpy(mddev->clevel, buf, len); | |
2549 | if (mddev->clevel[len-1] == '\n') | |
2550 | len--; | |
2551 | mddev->clevel[len] = 0; | |
2552 | mddev->level = LEVEL_NONE; | |
2553 | return rv; | |
2554 | } | |
2555 | ||
2556 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2557 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2558 | |
d4dbd025 N |
2559 | |
2560 | static ssize_t | |
2561 | layout_show(mddev_t *mddev, char *page) | |
2562 | { | |
2563 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2564 | if (mddev->reshape_position != MaxSector && |
2565 | mddev->layout != mddev->new_layout) | |
2566 | return sprintf(page, "%d (%d)\n", | |
2567 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2568 | return sprintf(page, "%d\n", mddev->layout); |
2569 | } | |
2570 | ||
2571 | static ssize_t | |
2572 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2573 | { | |
2574 | char *e; | |
2575 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2576 | |
2577 | if (!*buf || (*e && *e != '\n')) | |
2578 | return -EINVAL; | |
2579 | ||
08a02ecd N |
2580 | if (mddev->pers) |
2581 | return -EBUSY; | |
2582 | if (mddev->reshape_position != MaxSector) | |
2583 | mddev->new_layout = n; | |
2584 | else | |
2585 | mddev->layout = n; | |
d4dbd025 N |
2586 | return len; |
2587 | } | |
2588 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2589 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2590 | |
2591 | ||
eae1701f | 2592 | static ssize_t |
96de1e66 | 2593 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2594 | { |
bb636547 N |
2595 | if (mddev->raid_disks == 0) |
2596 | return 0; | |
08a02ecd N |
2597 | if (mddev->reshape_position != MaxSector && |
2598 | mddev->delta_disks != 0) | |
2599 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2600 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2601 | return sprintf(page, "%d\n", mddev->raid_disks); |
2602 | } | |
2603 | ||
da943b99 N |
2604 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2605 | ||
2606 | static ssize_t | |
2607 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2608 | { | |
da943b99 N |
2609 | char *e; |
2610 | int rv = 0; | |
2611 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2612 | ||
2613 | if (!*buf || (*e && *e != '\n')) | |
2614 | return -EINVAL; | |
2615 | ||
2616 | if (mddev->pers) | |
2617 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2618 | else if (mddev->reshape_position != MaxSector) { |
2619 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2620 | mddev->delta_disks = n - olddisks; | |
2621 | mddev->raid_disks = n; | |
2622 | } else | |
da943b99 N |
2623 | mddev->raid_disks = n; |
2624 | return rv ? rv : len; | |
2625 | } | |
2626 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2627 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2628 | |
3b34380a N |
2629 | static ssize_t |
2630 | chunk_size_show(mddev_t *mddev, char *page) | |
2631 | { | |
08a02ecd N |
2632 | if (mddev->reshape_position != MaxSector && |
2633 | mddev->chunk_size != mddev->new_chunk) | |
2634 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2635 | mddev->chunk_size); | |
3b34380a N |
2636 | return sprintf(page, "%d\n", mddev->chunk_size); |
2637 | } | |
2638 | ||
2639 | static ssize_t | |
2640 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2641 | { | |
2642 | /* can only set chunk_size if array is not yet active */ | |
2643 | char *e; | |
2644 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2645 | ||
3b34380a N |
2646 | if (!*buf || (*e && *e != '\n')) |
2647 | return -EINVAL; | |
2648 | ||
08a02ecd N |
2649 | if (mddev->pers) |
2650 | return -EBUSY; | |
2651 | else if (mddev->reshape_position != MaxSector) | |
2652 | mddev->new_chunk = n; | |
2653 | else | |
2654 | mddev->chunk_size = n; | |
3b34380a N |
2655 | return len; |
2656 | } | |
2657 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2658 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2659 | |
a94213b1 N |
2660 | static ssize_t |
2661 | resync_start_show(mddev_t *mddev, char *page) | |
2662 | { | |
2663 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2664 | } | |
2665 | ||
2666 | static ssize_t | |
2667 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2668 | { | |
a94213b1 N |
2669 | char *e; |
2670 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2671 | ||
2672 | if (mddev->pers) | |
2673 | return -EBUSY; | |
2674 | if (!*buf || (*e && *e != '\n')) | |
2675 | return -EINVAL; | |
2676 | ||
2677 | mddev->recovery_cp = n; | |
2678 | return len; | |
2679 | } | |
2680 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2681 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2682 | |
9e653b63 N |
2683 | /* |
2684 | * The array state can be: | |
2685 | * | |
2686 | * clear | |
2687 | * No devices, no size, no level | |
2688 | * Equivalent to STOP_ARRAY ioctl | |
2689 | * inactive | |
2690 | * May have some settings, but array is not active | |
2691 | * all IO results in error | |
2692 | * When written, doesn't tear down array, but just stops it | |
2693 | * suspended (not supported yet) | |
2694 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2695 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2696 | * readonly |
2697 | * no resync can happen. no superblocks get written. | |
2698 | * write requests fail | |
2699 | * read-auto | |
2700 | * like readonly, but behaves like 'clean' on a write request. | |
2701 | * | |
2702 | * clean - no pending writes, but otherwise active. | |
2703 | * When written to inactive array, starts without resync | |
2704 | * If a write request arrives then | |
2705 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2706 | * if not known, block and switch to write-pending | |
2707 | * If written to an active array that has pending writes, then fails. | |
2708 | * active | |
2709 | * fully active: IO and resync can be happening. | |
2710 | * When written to inactive array, starts with resync | |
2711 | * | |
2712 | * write-pending | |
2713 | * clean, but writes are blocked waiting for 'active' to be written. | |
2714 | * | |
2715 | * active-idle | |
2716 | * like active, but no writes have been seen for a while (100msec). | |
2717 | * | |
2718 | */ | |
2719 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2720 | write_pending, active_idle, bad_word}; | |
05381954 | 2721 | static char *array_states[] = { |
9e653b63 N |
2722 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2723 | "write-pending", "active-idle", NULL }; | |
2724 | ||
2725 | static int match_word(const char *word, char **list) | |
2726 | { | |
2727 | int n; | |
2728 | for (n=0; list[n]; n++) | |
2729 | if (cmd_match(word, list[n])) | |
2730 | break; | |
2731 | return n; | |
2732 | } | |
2733 | ||
2734 | static ssize_t | |
2735 | array_state_show(mddev_t *mddev, char *page) | |
2736 | { | |
2737 | enum array_state st = inactive; | |
2738 | ||
2739 | if (mddev->pers) | |
2740 | switch(mddev->ro) { | |
2741 | case 1: | |
2742 | st = readonly; | |
2743 | break; | |
2744 | case 2: | |
2745 | st = read_auto; | |
2746 | break; | |
2747 | case 0: | |
2748 | if (mddev->in_sync) | |
2749 | st = clean; | |
e691063a N |
2750 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2751 | st = write_pending; | |
9e653b63 N |
2752 | else if (mddev->safemode) |
2753 | st = active_idle; | |
2754 | else | |
2755 | st = active; | |
2756 | } | |
2757 | else { | |
2758 | if (list_empty(&mddev->disks) && | |
2759 | mddev->raid_disks == 0 && | |
2760 | mddev->size == 0) | |
2761 | st = clear; | |
2762 | else | |
2763 | st = inactive; | |
2764 | } | |
2765 | return sprintf(page, "%s\n", array_states[st]); | |
2766 | } | |
2767 | ||
df5b20cf | 2768 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
2769 | static int do_md_run(mddev_t * mddev); |
2770 | static int restart_array(mddev_t *mddev); | |
2771 | ||
2772 | static ssize_t | |
2773 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2774 | { | |
2775 | int err = -EINVAL; | |
2776 | enum array_state st = match_word(buf, array_states); | |
2777 | switch(st) { | |
2778 | case bad_word: | |
2779 | break; | |
2780 | case clear: | |
2781 | /* stopping an active array */ | |
f2ea68cf | 2782 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 2783 | return -EBUSY; |
df5b20cf | 2784 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
2785 | break; |
2786 | case inactive: | |
2787 | /* stopping an active array */ | |
2788 | if (mddev->pers) { | |
f2ea68cf | 2789 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 2790 | return -EBUSY; |
df5b20cf | 2791 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
2792 | } else |
2793 | err = 0; /* already inactive */ | |
9e653b63 N |
2794 | break; |
2795 | case suspended: | |
2796 | break; /* not supported yet */ | |
2797 | case readonly: | |
2798 | if (mddev->pers) | |
df5b20cf | 2799 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
2800 | else { |
2801 | mddev->ro = 1; | |
648b629e | 2802 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
2803 | err = do_md_run(mddev); |
2804 | } | |
2805 | break; | |
2806 | case read_auto: | |
9e653b63 | 2807 | if (mddev->pers) { |
80268ee9 | 2808 | if (mddev->ro == 0) |
df5b20cf | 2809 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 2810 | else if (mddev->ro == 1) |
648b629e N |
2811 | err = restart_array(mddev); |
2812 | if (err == 0) { | |
2813 | mddev->ro = 2; | |
2814 | set_disk_ro(mddev->gendisk, 0); | |
2815 | } | |
9e653b63 N |
2816 | } else { |
2817 | mddev->ro = 2; | |
2818 | err = do_md_run(mddev); | |
2819 | } | |
2820 | break; | |
2821 | case clean: | |
2822 | if (mddev->pers) { | |
2823 | restart_array(mddev); | |
2824 | spin_lock_irq(&mddev->write_lock); | |
2825 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2826 | if (mddev->in_sync == 0) { |
2827 | mddev->in_sync = 1; | |
31a59e34 N |
2828 | if (mddev->safemode == 1) |
2829 | mddev->safemode = 0; | |
e691063a N |
2830 | if (mddev->persistent) |
2831 | set_bit(MD_CHANGE_CLEAN, | |
2832 | &mddev->flags); | |
2833 | } | |
2834 | err = 0; | |
2835 | } else | |
2836 | err = -EBUSY; | |
9e653b63 N |
2837 | spin_unlock_irq(&mddev->write_lock); |
2838 | } else { | |
2839 | mddev->ro = 0; | |
2840 | mddev->recovery_cp = MaxSector; | |
2841 | err = do_md_run(mddev); | |
2842 | } | |
2843 | break; | |
2844 | case active: | |
2845 | if (mddev->pers) { | |
2846 | restart_array(mddev); | |
e691063a N |
2847 | if (mddev->external) |
2848 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2849 | wake_up(&mddev->sb_wait); |
2850 | err = 0; | |
2851 | } else { | |
2852 | mddev->ro = 0; | |
648b629e | 2853 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
2854 | err = do_md_run(mddev); |
2855 | } | |
2856 | break; | |
2857 | case write_pending: | |
2858 | case active_idle: | |
2859 | /* these cannot be set */ | |
2860 | break; | |
2861 | } | |
2862 | if (err) | |
2863 | return err; | |
0fd62b86 | 2864 | else { |
b62b7590 | 2865 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 2866 | return len; |
0fd62b86 | 2867 | } |
9e653b63 | 2868 | } |
80ca3a44 N |
2869 | static struct md_sysfs_entry md_array_state = |
2870 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2871 | |
6d7ff738 N |
2872 | static ssize_t |
2873 | null_show(mddev_t *mddev, char *page) | |
2874 | { | |
2875 | return -EINVAL; | |
2876 | } | |
2877 | ||
2878 | static ssize_t | |
2879 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2880 | { | |
2881 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2882 | /* The new device is added to the array. | |
2883 | * If the array has a persistent superblock, we read the | |
2884 | * superblock to initialise info and check validity. | |
2885 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2886 | * which mainly checks size. | |
2887 | */ | |
2888 | char *e; | |
2889 | int major = simple_strtoul(buf, &e, 10); | |
2890 | int minor; | |
2891 | dev_t dev; | |
2892 | mdk_rdev_t *rdev; | |
2893 | int err; | |
2894 | ||
2895 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2896 | return -EINVAL; | |
2897 | minor = simple_strtoul(e+1, &e, 10); | |
2898 | if (*e && *e != '\n') | |
2899 | return -EINVAL; | |
2900 | dev = MKDEV(major, minor); | |
2901 | if (major != MAJOR(dev) || | |
2902 | minor != MINOR(dev)) | |
2903 | return -EOVERFLOW; | |
2904 | ||
2905 | ||
2906 | if (mddev->persistent) { | |
2907 | rdev = md_import_device(dev, mddev->major_version, | |
2908 | mddev->minor_version); | |
2909 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2910 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2911 | mdk_rdev_t, same_set); | |
2912 | err = super_types[mddev->major_version] | |
2913 | .load_super(rdev, rdev0, mddev->minor_version); | |
2914 | if (err < 0) | |
2915 | goto out; | |
2916 | } | |
c5d79adb N |
2917 | } else if (mddev->external) |
2918 | rdev = md_import_device(dev, -2, -1); | |
2919 | else | |
6d7ff738 N |
2920 | rdev = md_import_device(dev, -1, -1); |
2921 | ||
2922 | if (IS_ERR(rdev)) | |
2923 | return PTR_ERR(rdev); | |
2924 | err = bind_rdev_to_array(rdev, mddev); | |
2925 | out: | |
2926 | if (err) | |
2927 | export_rdev(rdev); | |
2928 | return err ? err : len; | |
2929 | } | |
2930 | ||
2931 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2932 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2933 | |
9b1d1dac PC |
2934 | static ssize_t |
2935 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2936 | { | |
2937 | char *end; | |
2938 | unsigned long chunk, end_chunk; | |
2939 | ||
2940 | if (!mddev->bitmap) | |
2941 | goto out; | |
2942 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2943 | while (*buf) { | |
2944 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2945 | if (buf == end) break; | |
2946 | if (*end == '-') { /* range */ | |
2947 | buf = end + 1; | |
2948 | end_chunk = simple_strtoul(buf, &end, 0); | |
2949 | if (buf == end) break; | |
2950 | } | |
2951 | if (*end && !isspace(*end)) break; | |
2952 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2953 | buf = end; | |
2954 | while (isspace(*buf)) buf++; | |
2955 | } | |
2956 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2957 | out: | |
2958 | return len; | |
2959 | } | |
2960 | ||
2961 | static struct md_sysfs_entry md_bitmap = | |
2962 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2963 | ||
a35b0d69 N |
2964 | static ssize_t |
2965 | size_show(mddev_t *mddev, char *page) | |
2966 | { | |
2967 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2968 | } | |
2969 | ||
d71f9f88 | 2970 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
2971 | |
2972 | static ssize_t | |
2973 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2974 | { | |
2975 | /* If array is inactive, we can reduce the component size, but | |
2976 | * not increase it (except from 0). | |
2977 | * If array is active, we can try an on-line resize | |
2978 | */ | |
2979 | char *e; | |
2980 | int err = 0; | |
2981 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2982 | if (!*buf || *buf == '\n' || | |
2983 | (*e && *e != '\n')) | |
2984 | return -EINVAL; | |
2985 | ||
2986 | if (mddev->pers) { | |
d71f9f88 | 2987 | err = update_size(mddev, size * 2); |
850b2b42 | 2988 | md_update_sb(mddev, 1); |
a35b0d69 N |
2989 | } else { |
2990 | if (mddev->size == 0 || | |
2991 | mddev->size > size) | |
2992 | mddev->size = size; | |
2993 | else | |
2994 | err = -ENOSPC; | |
2995 | } | |
2996 | return err ? err : len; | |
2997 | } | |
2998 | ||
2999 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3000 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3001 | |
8bb93aac N |
3002 | |
3003 | /* Metdata version. | |
e691063a N |
3004 | * This is one of |
3005 | * 'none' for arrays with no metadata (good luck...) | |
3006 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3007 | * or N.M for internally known formats |
3008 | */ | |
3009 | static ssize_t | |
3010 | metadata_show(mddev_t *mddev, char *page) | |
3011 | { | |
3012 | if (mddev->persistent) | |
3013 | return sprintf(page, "%d.%d\n", | |
3014 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3015 | else if (mddev->external) |
3016 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3017 | else |
3018 | return sprintf(page, "none\n"); | |
3019 | } | |
3020 | ||
3021 | static ssize_t | |
3022 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3023 | { | |
3024 | int major, minor; | |
3025 | char *e; | |
ea43ddd8 N |
3026 | /* Changing the details of 'external' metadata is |
3027 | * always permitted. Otherwise there must be | |
3028 | * no devices attached to the array. | |
3029 | */ | |
3030 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3031 | ; | |
3032 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3033 | return -EBUSY; |
3034 | ||
3035 | if (cmd_match(buf, "none")) { | |
3036 | mddev->persistent = 0; | |
e691063a N |
3037 | mddev->external = 0; |
3038 | mddev->major_version = 0; | |
3039 | mddev->minor_version = 90; | |
3040 | return len; | |
3041 | } | |
3042 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3043 | size_t namelen = len-9; |
e691063a N |
3044 | if (namelen >= sizeof(mddev->metadata_type)) |
3045 | namelen = sizeof(mddev->metadata_type)-1; | |
3046 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3047 | mddev->metadata_type[namelen] = 0; | |
3048 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3049 | mddev->metadata_type[--namelen] = 0; | |
3050 | mddev->persistent = 0; | |
3051 | mddev->external = 1; | |
8bb93aac N |
3052 | mddev->major_version = 0; |
3053 | mddev->minor_version = 90; | |
3054 | return len; | |
3055 | } | |
3056 | major = simple_strtoul(buf, &e, 10); | |
3057 | if (e==buf || *e != '.') | |
3058 | return -EINVAL; | |
3059 | buf = e+1; | |
3060 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3061 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3062 | return -EINVAL; |
50511da3 | 3063 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3064 | return -ENOENT; |
3065 | mddev->major_version = major; | |
3066 | mddev->minor_version = minor; | |
3067 | mddev->persistent = 1; | |
e691063a | 3068 | mddev->external = 0; |
8bb93aac N |
3069 | return len; |
3070 | } | |
3071 | ||
3072 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3073 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3074 | |
24dd469d | 3075 | static ssize_t |
7eec314d | 3076 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3077 | { |
7eec314d | 3078 | char *type = "idle"; |
31399d9e | 3079 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 3080 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3081 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3082 | type = "reshape"; | |
3083 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3084 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3085 | type = "resync"; | |
3086 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3087 | type = "check"; | |
3088 | else | |
3089 | type = "repair"; | |
72a23c21 | 3090 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3091 | type = "recover"; |
3092 | } | |
3093 | return sprintf(page, "%s\n", type); | |
3094 | } | |
3095 | ||
3096 | static ssize_t | |
7eec314d | 3097 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3098 | { |
7eec314d N |
3099 | if (!mddev->pers || !mddev->pers->sync_request) |
3100 | return -EINVAL; | |
3101 | ||
bce74dac | 3102 | if (cmd_match(page, "idle")) { |
7eec314d N |
3103 | if (mddev->sync_thread) { |
3104 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3105 | md_unregister_thread(mddev->sync_thread); | |
3106 | mddev->sync_thread = NULL; | |
3107 | mddev->recovery = 0; | |
3108 | } | |
03c902e1 N |
3109 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3110 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3111 | return -EBUSY; |
72a23c21 NB |
3112 | else if (cmd_match(page, "resync")) |
3113 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3114 | else if (cmd_match(page, "recover")) { | |
3115 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3116 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3117 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3118 | int err; |
3119 | if (mddev->pers->start_reshape == NULL) | |
3120 | return -EINVAL; | |
3121 | err = mddev->pers->start_reshape(mddev); | |
3122 | if (err) | |
3123 | return err; | |
a99ac971 | 3124 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3125 | } else { |
bce74dac | 3126 | if (cmd_match(page, "check")) |
7eec314d | 3127 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3128 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3129 | return -EINVAL; |
3130 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3131 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3132 | } |
03c902e1 | 3133 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3134 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3135 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3136 | return len; |
3137 | } | |
3138 | ||
9d88883e | 3139 | static ssize_t |
96de1e66 | 3140 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3141 | { |
3142 | return sprintf(page, "%llu\n", | |
3143 | (unsigned long long) mddev->resync_mismatches); | |
3144 | } | |
3145 | ||
80ca3a44 N |
3146 | static struct md_sysfs_entry md_scan_mode = |
3147 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3148 | |
96de1e66 | 3149 | |
80ca3a44 | 3150 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3151 | |
88202a0c N |
3152 | static ssize_t |
3153 | sync_min_show(mddev_t *mddev, char *page) | |
3154 | { | |
3155 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3156 | mddev->sync_speed_min ? "local": "system"); | |
3157 | } | |
3158 | ||
3159 | static ssize_t | |
3160 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3161 | { | |
3162 | int min; | |
3163 | char *e; | |
3164 | if (strncmp(buf, "system", 6)==0) { | |
3165 | mddev->sync_speed_min = 0; | |
3166 | return len; | |
3167 | } | |
3168 | min = simple_strtoul(buf, &e, 10); | |
3169 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3170 | return -EINVAL; | |
3171 | mddev->sync_speed_min = min; | |
3172 | return len; | |
3173 | } | |
3174 | ||
3175 | static struct md_sysfs_entry md_sync_min = | |
3176 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3177 | ||
3178 | static ssize_t | |
3179 | sync_max_show(mddev_t *mddev, char *page) | |
3180 | { | |
3181 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3182 | mddev->sync_speed_max ? "local": "system"); | |
3183 | } | |
3184 | ||
3185 | static ssize_t | |
3186 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3187 | { | |
3188 | int max; | |
3189 | char *e; | |
3190 | if (strncmp(buf, "system", 6)==0) { | |
3191 | mddev->sync_speed_max = 0; | |
3192 | return len; | |
3193 | } | |
3194 | max = simple_strtoul(buf, &e, 10); | |
3195 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3196 | return -EINVAL; | |
3197 | mddev->sync_speed_max = max; | |
3198 | return len; | |
3199 | } | |
3200 | ||
3201 | static struct md_sysfs_entry md_sync_max = | |
3202 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3203 | ||
d7f3d291 IP |
3204 | static ssize_t |
3205 | degraded_show(mddev_t *mddev, char *page) | |
3206 | { | |
3207 | return sprintf(page, "%d\n", mddev->degraded); | |
3208 | } | |
3209 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3210 | |
90b08710 BS |
3211 | static ssize_t |
3212 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3213 | { | |
3214 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3215 | } | |
3216 | ||
3217 | static ssize_t | |
3218 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3219 | { | |
3220 | long n; | |
3221 | ||
3222 | if (strict_strtol(buf, 10, &n)) | |
3223 | return -EINVAL; | |
3224 | ||
3225 | if (n != 0 && n != 1) | |
3226 | return -EINVAL; | |
3227 | ||
3228 | mddev->parallel_resync = n; | |
3229 | ||
3230 | if (mddev->sync_thread) | |
3231 | wake_up(&resync_wait); | |
3232 | ||
3233 | return len; | |
3234 | } | |
3235 | ||
3236 | /* force parallel resync, even with shared block devices */ | |
3237 | static struct md_sysfs_entry md_sync_force_parallel = | |
3238 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3239 | sync_force_parallel_show, sync_force_parallel_store); | |
3240 | ||
88202a0c N |
3241 | static ssize_t |
3242 | sync_speed_show(mddev_t *mddev, char *page) | |
3243 | { | |
3244 | unsigned long resync, dt, db; | |
9687a60c AN |
3245 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3246 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3247 | if (!dt) dt++; |
9687a60c AN |
3248 | db = resync - mddev->resync_mark_cnt; |
3249 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3250 | } |
3251 | ||
80ca3a44 | 3252 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3253 | |
3254 | static ssize_t | |
3255 | sync_completed_show(mddev_t *mddev, char *page) | |
3256 | { | |
3257 | unsigned long max_blocks, resync; | |
3258 | ||
3259 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3260 | max_blocks = mddev->resync_max_sectors; | |
3261 | else | |
3262 | max_blocks = mddev->size << 1; | |
3263 | ||
3264 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
3265 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
3266 | } | |
3267 | ||
80ca3a44 | 3268 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3269 | |
5e96ee65 NB |
3270 | static ssize_t |
3271 | min_sync_show(mddev_t *mddev, char *page) | |
3272 | { | |
3273 | return sprintf(page, "%llu\n", | |
3274 | (unsigned long long)mddev->resync_min); | |
3275 | } | |
3276 | static ssize_t | |
3277 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3278 | { | |
3279 | unsigned long long min; | |
3280 | if (strict_strtoull(buf, 10, &min)) | |
3281 | return -EINVAL; | |
3282 | if (min > mddev->resync_max) | |
3283 | return -EINVAL; | |
3284 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3285 | return -EBUSY; | |
3286 | ||
3287 | /* Must be a multiple of chunk_size */ | |
3288 | if (mddev->chunk_size) { | |
3289 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3290 | return -EINVAL; | |
3291 | } | |
3292 | mddev->resync_min = min; | |
3293 | ||
3294 | return len; | |
3295 | } | |
3296 | ||
3297 | static struct md_sysfs_entry md_min_sync = | |
3298 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3299 | ||
c6207277 N |
3300 | static ssize_t |
3301 | max_sync_show(mddev_t *mddev, char *page) | |
3302 | { | |
3303 | if (mddev->resync_max == MaxSector) | |
3304 | return sprintf(page, "max\n"); | |
3305 | else | |
3306 | return sprintf(page, "%llu\n", | |
3307 | (unsigned long long)mddev->resync_max); | |
3308 | } | |
3309 | static ssize_t | |
3310 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3311 | { | |
3312 | if (strncmp(buf, "max", 3) == 0) | |
3313 | mddev->resync_max = MaxSector; | |
3314 | else { | |
5e96ee65 NB |
3315 | unsigned long long max; |
3316 | if (strict_strtoull(buf, 10, &max)) | |
3317 | return -EINVAL; | |
3318 | if (max < mddev->resync_min) | |
c6207277 N |
3319 | return -EINVAL; |
3320 | if (max < mddev->resync_max && | |
3321 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3322 | return -EBUSY; | |
3323 | ||
3324 | /* Must be a multiple of chunk_size */ | |
3325 | if (mddev->chunk_size) { | |
3326 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3327 | return -EINVAL; | |
3328 | } | |
3329 | mddev->resync_max = max; | |
3330 | } | |
3331 | wake_up(&mddev->recovery_wait); | |
3332 | return len; | |
3333 | } | |
3334 | ||
3335 | static struct md_sysfs_entry md_max_sync = | |
3336 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3337 | ||
e464eafd N |
3338 | static ssize_t |
3339 | suspend_lo_show(mddev_t *mddev, char *page) | |
3340 | { | |
3341 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3342 | } | |
3343 | ||
3344 | static ssize_t | |
3345 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3346 | { | |
3347 | char *e; | |
3348 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3349 | ||
3350 | if (mddev->pers->quiesce == NULL) | |
3351 | return -EINVAL; | |
3352 | if (buf == e || (*e && *e != '\n')) | |
3353 | return -EINVAL; | |
3354 | if (new >= mddev->suspend_hi || | |
3355 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3356 | mddev->suspend_lo = new; | |
3357 | mddev->pers->quiesce(mddev, 2); | |
3358 | return len; | |
3359 | } else | |
3360 | return -EINVAL; | |
3361 | } | |
3362 | static struct md_sysfs_entry md_suspend_lo = | |
3363 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3364 | ||
3365 | ||
3366 | static ssize_t | |
3367 | suspend_hi_show(mddev_t *mddev, char *page) | |
3368 | { | |
3369 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3370 | } | |
3371 | ||
3372 | static ssize_t | |
3373 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3374 | { | |
3375 | char *e; | |
3376 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3377 | ||
3378 | if (mddev->pers->quiesce == NULL) | |
3379 | return -EINVAL; | |
3380 | if (buf == e || (*e && *e != '\n')) | |
3381 | return -EINVAL; | |
3382 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3383 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3384 | mddev->suspend_hi = new; | |
3385 | mddev->pers->quiesce(mddev, 1); | |
3386 | mddev->pers->quiesce(mddev, 0); | |
3387 | return len; | |
3388 | } else | |
3389 | return -EINVAL; | |
3390 | } | |
3391 | static struct md_sysfs_entry md_suspend_hi = | |
3392 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3393 | ||
08a02ecd N |
3394 | static ssize_t |
3395 | reshape_position_show(mddev_t *mddev, char *page) | |
3396 | { | |
3397 | if (mddev->reshape_position != MaxSector) | |
3398 | return sprintf(page, "%llu\n", | |
3399 | (unsigned long long)mddev->reshape_position); | |
3400 | strcpy(page, "none\n"); | |
3401 | return 5; | |
3402 | } | |
3403 | ||
3404 | static ssize_t | |
3405 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3406 | { | |
3407 | char *e; | |
3408 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3409 | if (mddev->pers) | |
3410 | return -EBUSY; | |
3411 | if (buf == e || (*e && *e != '\n')) | |
3412 | return -EINVAL; | |
3413 | mddev->reshape_position = new; | |
3414 | mddev->delta_disks = 0; | |
3415 | mddev->new_level = mddev->level; | |
3416 | mddev->new_layout = mddev->layout; | |
3417 | mddev->new_chunk = mddev->chunk_size; | |
3418 | return len; | |
3419 | } | |
3420 | ||
3421 | static struct md_sysfs_entry md_reshape_position = | |
3422 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3423 | reshape_position_store); | |
3424 | ||
e464eafd | 3425 | |
eae1701f N |
3426 | static struct attribute *md_default_attrs[] = { |
3427 | &md_level.attr, | |
d4dbd025 | 3428 | &md_layout.attr, |
eae1701f | 3429 | &md_raid_disks.attr, |
3b34380a | 3430 | &md_chunk_size.attr, |
a35b0d69 | 3431 | &md_size.attr, |
a94213b1 | 3432 | &md_resync_start.attr, |
8bb93aac | 3433 | &md_metadata.attr, |
6d7ff738 | 3434 | &md_new_device.attr, |
16f17b39 | 3435 | &md_safe_delay.attr, |
9e653b63 | 3436 | &md_array_state.attr, |
08a02ecd | 3437 | &md_reshape_position.attr, |
411036fa N |
3438 | NULL, |
3439 | }; | |
3440 | ||
3441 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3442 | &md_scan_mode.attr, |
9d88883e | 3443 | &md_mismatches.attr, |
88202a0c N |
3444 | &md_sync_min.attr, |
3445 | &md_sync_max.attr, | |
3446 | &md_sync_speed.attr, | |
90b08710 | 3447 | &md_sync_force_parallel.attr, |
88202a0c | 3448 | &md_sync_completed.attr, |
5e96ee65 | 3449 | &md_min_sync.attr, |
c6207277 | 3450 | &md_max_sync.attr, |
e464eafd N |
3451 | &md_suspend_lo.attr, |
3452 | &md_suspend_hi.attr, | |
9b1d1dac | 3453 | &md_bitmap.attr, |
d7f3d291 | 3454 | &md_degraded.attr, |
eae1701f N |
3455 | NULL, |
3456 | }; | |
411036fa N |
3457 | static struct attribute_group md_redundancy_group = { |
3458 | .name = NULL, | |
3459 | .attrs = md_redundancy_attrs, | |
3460 | }; | |
3461 | ||
eae1701f N |
3462 | |
3463 | static ssize_t | |
3464 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3465 | { | |
3466 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3467 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3468 | ssize_t rv; |
eae1701f N |
3469 | |
3470 | if (!entry->show) | |
3471 | return -EIO; | |
5dc5cf7d IM |
3472 | rv = mddev_lock(mddev); |
3473 | if (!rv) { | |
3474 | rv = entry->show(mddev, page); | |
3475 | mddev_unlock(mddev); | |
3476 | } | |
96de1e66 | 3477 | return rv; |
eae1701f N |
3478 | } |
3479 | ||
3480 | static ssize_t | |
3481 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3482 | const char *page, size_t length) | |
3483 | { | |
3484 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3485 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3486 | ssize_t rv; |
eae1701f N |
3487 | |
3488 | if (!entry->store) | |
3489 | return -EIO; | |
67463acb N |
3490 | if (!capable(CAP_SYS_ADMIN)) |
3491 | return -EACCES; | |
5dc5cf7d | 3492 | rv = mddev_lock(mddev); |
d3374825 N |
3493 | if (mddev->hold_active == UNTIL_IOCTL) |
3494 | mddev->hold_active = 0; | |
5dc5cf7d IM |
3495 | if (!rv) { |
3496 | rv = entry->store(mddev, page, length); | |
3497 | mddev_unlock(mddev); | |
3498 | } | |
96de1e66 | 3499 | return rv; |
eae1701f N |
3500 | } |
3501 | ||
3502 | static void md_free(struct kobject *ko) | |
3503 | { | |
3504 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
3505 | |
3506 | if (mddev->sysfs_state) | |
3507 | sysfs_put(mddev->sysfs_state); | |
3508 | ||
3509 | if (mddev->gendisk) { | |
3510 | del_gendisk(mddev->gendisk); | |
3511 | put_disk(mddev->gendisk); | |
3512 | } | |
3513 | if (mddev->queue) | |
3514 | blk_cleanup_queue(mddev->queue); | |
3515 | ||
eae1701f N |
3516 | kfree(mddev); |
3517 | } | |
3518 | ||
3519 | static struct sysfs_ops md_sysfs_ops = { | |
3520 | .show = md_attr_show, | |
3521 | .store = md_attr_store, | |
3522 | }; | |
3523 | static struct kobj_type md_ktype = { | |
3524 | .release = md_free, | |
3525 | .sysfs_ops = &md_sysfs_ops, | |
3526 | .default_attrs = md_default_attrs, | |
3527 | }; | |
3528 | ||
1da177e4 LT |
3529 | int mdp_major = 0; |
3530 | ||
efeb53c0 | 3531 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 3532 | { |
48c9c27b | 3533 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3534 | mddev_t *mddev = mddev_find(dev); |
3535 | struct gendisk *disk; | |
efeb53c0 N |
3536 | int partitioned; |
3537 | int shift; | |
3538 | int unit; | |
3830c62f | 3539 | int error; |
1da177e4 LT |
3540 | |
3541 | if (!mddev) | |
efeb53c0 N |
3542 | return -ENODEV; |
3543 | ||
3544 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
3545 | shift = partitioned ? MdpMinorShift : 0; | |
3546 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 3547 | |
d3374825 N |
3548 | /* wait for any previous instance if this device |
3549 | * to be completed removed (mddev_delayed_delete). | |
3550 | */ | |
3551 | flush_scheduled_work(); | |
3552 | ||
48c9c27b | 3553 | mutex_lock(&disks_mutex); |
1da177e4 | 3554 | if (mddev->gendisk) { |
48c9c27b | 3555 | mutex_unlock(&disks_mutex); |
1da177e4 | 3556 | mddev_put(mddev); |
efeb53c0 N |
3557 | return -EEXIST; |
3558 | } | |
3559 | ||
3560 | if (name) { | |
3561 | /* Need to ensure that 'name' is not a duplicate. | |
3562 | */ | |
3563 | mddev_t *mddev2; | |
3564 | spin_lock(&all_mddevs_lock); | |
3565 | ||
3566 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
3567 | if (mddev2->gendisk && | |
3568 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
3569 | spin_unlock(&all_mddevs_lock); | |
3570 | return -EEXIST; | |
3571 | } | |
3572 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 3573 | } |
8b765398 N |
3574 | |
3575 | mddev->queue = blk_alloc_queue(GFP_KERNEL); | |
3576 | if (!mddev->queue) { | |
3577 | mutex_unlock(&disks_mutex); | |
3578 | mddev_put(mddev); | |
efeb53c0 | 3579 | return -ENOMEM; |
8b765398 N |
3580 | } |
3581 | /* Can be unlocked because the queue is new: no concurrency */ | |
3582 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
3583 | ||
3584 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3585 | ||
1da177e4 LT |
3586 | disk = alloc_disk(1 << shift); |
3587 | if (!disk) { | |
48c9c27b | 3588 | mutex_unlock(&disks_mutex); |
8b765398 N |
3589 | blk_cleanup_queue(mddev->queue); |
3590 | mddev->queue = NULL; | |
1da177e4 | 3591 | mddev_put(mddev); |
efeb53c0 | 3592 | return -ENOMEM; |
1da177e4 | 3593 | } |
efeb53c0 | 3594 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 3595 | disk->first_minor = unit << shift; |
efeb53c0 N |
3596 | if (name) |
3597 | strcpy(disk->disk_name, name); | |
3598 | else if (partitioned) | |
1da177e4 | 3599 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3600 | else |
1da177e4 | 3601 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3602 | disk->fops = &md_fops; |
3603 | disk->private_data = mddev; | |
3604 | disk->queue = mddev->queue; | |
92850bbd | 3605 | /* Allow extended partitions. This makes the |
d3374825 | 3606 | * 'mdp' device redundant, but we can't really |
92850bbd N |
3607 | * remove it now. |
3608 | */ | |
3609 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
3610 | add_disk(disk); |
3611 | mddev->gendisk = disk; | |
ed9e1982 TH |
3612 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
3613 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
f48ed538 | 3614 | mutex_unlock(&disks_mutex); |
3830c62f | 3615 | if (error) |
5e55e2f5 N |
3616 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3617 | disk->disk_name); | |
b62b7590 | 3618 | else { |
3830c62f | 3619 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
3620 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
3621 | } | |
d3374825 | 3622 | mddev_put(mddev); |
efeb53c0 N |
3623 | return 0; |
3624 | } | |
3625 | ||
3626 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3627 | { | |
3628 | md_alloc(dev, NULL); | |
1da177e4 LT |
3629 | return NULL; |
3630 | } | |
3631 | ||
efeb53c0 N |
3632 | static int add_named_array(const char *val, struct kernel_param *kp) |
3633 | { | |
3634 | /* val must be "md_*" where * is not all digits. | |
3635 | * We allocate an array with a large free minor number, and | |
3636 | * set the name to val. val must not already be an active name. | |
3637 | */ | |
3638 | int len = strlen(val); | |
3639 | char buf[DISK_NAME_LEN]; | |
3640 | ||
3641 | while (len && val[len-1] == '\n') | |
3642 | len--; | |
3643 | if (len >= DISK_NAME_LEN) | |
3644 | return -E2BIG; | |
3645 | strlcpy(buf, val, len+1); | |
3646 | if (strncmp(buf, "md_", 3) != 0) | |
3647 | return -EINVAL; | |
3648 | return md_alloc(0, buf); | |
3649 | } | |
3650 | ||
1da177e4 LT |
3651 | static void md_safemode_timeout(unsigned long data) |
3652 | { | |
3653 | mddev_t *mddev = (mddev_t *) data; | |
3654 | ||
0fd62b86 NB |
3655 | if (!atomic_read(&mddev->writes_pending)) { |
3656 | mddev->safemode = 1; | |
3657 | if (mddev->external) | |
b62b7590 | 3658 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 3659 | } |
1da177e4 LT |
3660 | md_wakeup_thread(mddev->thread); |
3661 | } | |
3662 | ||
6ff8d8ec | 3663 | static int start_dirty_degraded; |
1da177e4 LT |
3664 | |
3665 | static int do_md_run(mddev_t * mddev) | |
3666 | { | |
2604b703 | 3667 | int err; |
1da177e4 | 3668 | int chunk_size; |
1da177e4 LT |
3669 | mdk_rdev_t *rdev; |
3670 | struct gendisk *disk; | |
2604b703 | 3671 | struct mdk_personality *pers; |
1da177e4 LT |
3672 | char b[BDEVNAME_SIZE]; |
3673 | ||
a757e64c N |
3674 | if (list_empty(&mddev->disks)) |
3675 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3676 | return -EINVAL; |
1da177e4 LT |
3677 | |
3678 | if (mddev->pers) | |
3679 | return -EBUSY; | |
3680 | ||
3681 | /* | |
3682 | * Analyze all RAID superblock(s) | |
3683 | */ | |
1ec4a939 N |
3684 | if (!mddev->raid_disks) { |
3685 | if (!mddev->persistent) | |
3686 | return -EINVAL; | |
a757e64c | 3687 | analyze_sbs(mddev); |
1ec4a939 | 3688 | } |
1da177e4 LT |
3689 | |
3690 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3691 | |
3692 | if (chunk_size) { | |
1da177e4 LT |
3693 | if (chunk_size > MAX_CHUNK_SIZE) { |
3694 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3695 | chunk_size, MAX_CHUNK_SIZE); | |
3696 | return -EINVAL; | |
3697 | } | |
3698 | /* | |
4bbf3771 | 3699 | * chunk-size has to be a power of 2 |
1da177e4 LT |
3700 | */ |
3701 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3702 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3703 | return -EINVAL; |
3704 | } | |
1da177e4 LT |
3705 | |
3706 | /* devices must have minimum size of one chunk */ | |
159ec1fc | 3707 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3708 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3709 | continue; |
3710 | if (rdev->size < chunk_size / 1024) { | |
3711 | printk(KERN_WARNING | |
3712 | "md: Dev %s smaller than chunk_size:" | |
3713 | " %lluk < %dk\n", | |
3714 | bdevname(rdev->bdev,b), | |
3715 | (unsigned long long)rdev->size, | |
3716 | chunk_size / 1024); | |
3717 | return -EINVAL; | |
3718 | } | |
3719 | } | |
3720 | } | |
3721 | ||
d9d166c2 N |
3722 | if (mddev->level != LEVEL_NONE) |
3723 | request_module("md-level-%d", mddev->level); | |
3724 | else if (mddev->clevel[0]) | |
3725 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3726 | |
3727 | /* | |
3728 | * Drop all container device buffers, from now on | |
3729 | * the only valid external interface is through the md | |
3730 | * device. | |
1da177e4 | 3731 | */ |
159ec1fc | 3732 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3733 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3734 | continue; |
3735 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3736 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3737 | |
3738 | /* perform some consistency tests on the device. | |
3739 | * We don't want the data to overlap the metadata, | |
3740 | * Internal Bitmap issues has handled elsewhere. | |
3741 | */ | |
0f420358 | 3742 | if (rdev->data_offset < rdev->sb_start) { |
f0d76d70 N |
3743 | if (mddev->size && |
3744 | rdev->data_offset + mddev->size*2 | |
0f420358 | 3745 | > rdev->sb_start) { |
f0d76d70 N |
3746 | printk("md: %s: data overlaps metadata\n", |
3747 | mdname(mddev)); | |
3748 | return -EINVAL; | |
3749 | } | |
3750 | } else { | |
0f420358 | 3751 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
3752 | > rdev->data_offset) { |
3753 | printk("md: %s: metadata overlaps data\n", | |
3754 | mdname(mddev)); | |
3755 | return -EINVAL; | |
3756 | } | |
3757 | } | |
3c0ee63a | 3758 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
3759 | } |
3760 | ||
3761 | md_probe(mddev->unit, NULL, NULL); | |
3762 | disk = mddev->gendisk; | |
3763 | if (!disk) | |
3764 | return -ENOMEM; | |
3765 | ||
3766 | spin_lock(&pers_lock); | |
d9d166c2 | 3767 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3768 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3769 | spin_unlock(&pers_lock); |
d9d166c2 N |
3770 | if (mddev->level != LEVEL_NONE) |
3771 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3772 | mddev->level); | |
3773 | else | |
3774 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3775 | mddev->clevel); | |
1da177e4 LT |
3776 | return -EINVAL; |
3777 | } | |
2604b703 | 3778 | mddev->pers = pers; |
1da177e4 | 3779 | spin_unlock(&pers_lock); |
d9d166c2 N |
3780 | mddev->level = pers->level; |
3781 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3782 | |
f6705578 | 3783 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3784 | pers->start_reshape == NULL) { |
f6705578 N |
3785 | /* This personality cannot handle reshaping... */ |
3786 | mddev->pers = NULL; | |
3787 | module_put(pers->owner); | |
3788 | return -EINVAL; | |
3789 | } | |
3790 | ||
7dd5e7c3 N |
3791 | if (pers->sync_request) { |
3792 | /* Warn if this is a potentially silly | |
3793 | * configuration. | |
3794 | */ | |
3795 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3796 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 3797 | int warned = 0; |
159ec1fc CR |
3798 | |
3799 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
3800 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
3801 | if (rdev < rdev2 && |
3802 | rdev->bdev->bd_contains == | |
3803 | rdev2->bdev->bd_contains) { | |
3804 | printk(KERN_WARNING | |
3805 | "%s: WARNING: %s appears to be" | |
3806 | " on the same physical disk as" | |
3807 | " %s.\n", | |
3808 | mdname(mddev), | |
3809 | bdevname(rdev->bdev,b), | |
3810 | bdevname(rdev2->bdev,b2)); | |
3811 | warned = 1; | |
3812 | } | |
3813 | } | |
159ec1fc | 3814 | |
7dd5e7c3 N |
3815 | if (warned) |
3816 | printk(KERN_WARNING | |
3817 | "True protection against single-disk" | |
3818 | " failure might be compromised.\n"); | |
3819 | } | |
3820 | ||
657390d2 | 3821 | mddev->recovery = 0; |
1da177e4 | 3822 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3823 | mddev->barriers_work = 1; |
6ff8d8ec | 3824 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3825 | |
f91de92e N |
3826 | if (start_readonly) |
3827 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3828 | ||
b15c2e57 | 3829 | err = mddev->pers->run(mddev); |
13e53df3 AN |
3830 | if (err) |
3831 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3832 | else if (mddev->pers->sync_request) { | |
b15c2e57 N |
3833 | err = bitmap_create(mddev); |
3834 | if (err) { | |
3835 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3836 | mdname(mddev), err); | |
3837 | mddev->pers->stop(mddev); | |
3838 | } | |
3839 | } | |
1da177e4 | 3840 | if (err) { |
1da177e4 LT |
3841 | module_put(mddev->pers->owner); |
3842 | mddev->pers = NULL; | |
32a7627c N |
3843 | bitmap_destroy(mddev); |
3844 | return err; | |
1da177e4 | 3845 | } |
5e55e2f5 N |
3846 | if (mddev->pers->sync_request) { |
3847 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3848 | printk(KERN_WARNING | |
3849 | "md: cannot register extra attributes for %s\n", | |
3850 | mdname(mddev)); | |
0c3573f1 | 3851 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 3852 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
3853 | mddev->ro = 0; |
3854 | ||
1da177e4 LT |
3855 | atomic_set(&mddev->writes_pending,0); |
3856 | mddev->safemode = 0; | |
3857 | mddev->safemode_timer.function = md_safemode_timeout; | |
3858 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3859 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3860 | mddev->in_sync = 1; |
86e6ffdd | 3861 | |
159ec1fc | 3862 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
3863 | if (rdev->raid_disk >= 0) { |
3864 | char nm[20]; | |
3865 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3866 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3867 | printk("md: cannot register %s for %s\n", | |
3868 | nm, mdname(mddev)); | |
86e6ffdd | 3869 | } |
1da177e4 LT |
3870 | |
3871 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3872 | ||
850b2b42 N |
3873 | if (mddev->flags) |
3874 | md_update_sb(mddev, 0); | |
1da177e4 | 3875 | |
f233ea5c | 3876 | set_capacity(disk, mddev->array_sectors); |
1da177e4 LT |
3877 | |
3878 | /* If we call blk_queue_make_request here, it will | |
3879 | * re-initialise max_sectors etc which may have been | |
3880 | * refined inside -> run. So just set the bits we need to set. | |
3881 | * Most initialisation happended when we called | |
3882 | * blk_queue_make_request(..., md_fail_request) | |
3883 | * earlier. | |
3884 | */ | |
3885 | mddev->queue->queuedata = mddev; | |
3886 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3887 | ||
5fd6c1dc N |
3888 | /* If there is a partially-recovered drive we need to |
3889 | * start recovery here. If we leave it to md_check_recovery, | |
3890 | * it will remove the drives and not do the right thing | |
3891 | */ | |
0b8c9de0 | 3892 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 3893 | int spares = 0; |
159ec1fc | 3894 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
3895 | if (rdev->raid_disk >= 0 && |
3896 | !test_bit(In_sync, &rdev->flags) && | |
3897 | !test_bit(Faulty, &rdev->flags)) | |
3898 | /* complete an interrupted recovery */ | |
3899 | spares++; | |
3900 | if (spares && mddev->pers->sync_request) { | |
3901 | mddev->recovery = 0; | |
3902 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3903 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3904 | mddev, | |
3905 | "%s_resync"); | |
3906 | if (!mddev->sync_thread) { | |
3907 | printk(KERN_ERR "%s: could not start resync" | |
3908 | " thread...\n", | |
3909 | mdname(mddev)); | |
3910 | /* leave the spares where they are, it shouldn't hurt */ | |
3911 | mddev->recovery = 0; | |
0b8c9de0 | 3912 | } |
5fd6c1dc N |
3913 | } |
3914 | } | |
0b8c9de0 N |
3915 | md_wakeup_thread(mddev->thread); |
3916 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3917 | |
44ce6294 | 3918 | mddev->changed = 1; |
d7603b7e | 3919 | md_new_event(mddev); |
b62b7590 | 3920 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
3921 | if (mddev->sysfs_action) |
3922 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 3923 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 3924 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
3925 | return 0; |
3926 | } | |
3927 | ||
3928 | static int restart_array(mddev_t *mddev) | |
3929 | { | |
3930 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 3931 | |
80fab1d7 | 3932 | /* Complain if it has no devices */ |
1da177e4 | 3933 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
3934 | return -ENXIO; |
3935 | if (!mddev->pers) | |
3936 | return -EINVAL; | |
3937 | if (!mddev->ro) | |
3938 | return -EBUSY; | |
3939 | mddev->safemode = 0; | |
3940 | mddev->ro = 0; | |
3941 | set_disk_ro(disk, 0); | |
3942 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3943 | mdname(mddev)); | |
3944 | /* Kick recovery or resync if necessary */ | |
3945 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3946 | md_wakeup_thread(mddev->thread); | |
3947 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 3948 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 3949 | return 0; |
1da177e4 LT |
3950 | } |
3951 | ||
acc55e22 N |
3952 | /* similar to deny_write_access, but accounts for our holding a reference |
3953 | * to the file ourselves */ | |
3954 | static int deny_bitmap_write_access(struct file * file) | |
3955 | { | |
3956 | struct inode *inode = file->f_mapping->host; | |
3957 | ||
3958 | spin_lock(&inode->i_lock); | |
3959 | if (atomic_read(&inode->i_writecount) > 1) { | |
3960 | spin_unlock(&inode->i_lock); | |
3961 | return -ETXTBSY; | |
3962 | } | |
3963 | atomic_set(&inode->i_writecount, -1); | |
3964 | spin_unlock(&inode->i_lock); | |
3965 | ||
3966 | return 0; | |
3967 | } | |
3968 | ||
3969 | static void restore_bitmap_write_access(struct file *file) | |
3970 | { | |
3971 | struct inode *inode = file->f_mapping->host; | |
3972 | ||
3973 | spin_lock(&inode->i_lock); | |
3974 | atomic_set(&inode->i_writecount, 1); | |
3975 | spin_unlock(&inode->i_lock); | |
3976 | } | |
3977 | ||
9e653b63 N |
3978 | /* mode: |
3979 | * 0 - completely stop and dis-assemble array | |
3980 | * 1 - switch to readonly | |
3981 | * 2 - stop but do not disassemble array | |
3982 | */ | |
df5b20cf | 3983 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
3984 | { |
3985 | int err = 0; | |
3986 | struct gendisk *disk = mddev->gendisk; | |
3987 | ||
f2ea68cf | 3988 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf NB |
3989 | printk("md: %s still in use.\n",mdname(mddev)); |
3990 | return -EBUSY; | |
3991 | } | |
3992 | ||
1da177e4 | 3993 | if (mddev->pers) { |
1da177e4 LT |
3994 | |
3995 | if (mddev->sync_thread) { | |
5fd6c1dc | 3996 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3997 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3998 | md_unregister_thread(mddev->sync_thread); | |
3999 | mddev->sync_thread = NULL; | |
4000 | } | |
4001 | ||
4002 | del_timer_sync(&mddev->safemode_timer); | |
4003 | ||
9e653b63 N |
4004 | switch(mode) { |
4005 | case 1: /* readonly */ | |
1da177e4 | 4006 | err = -ENXIO; |
f91de92e | 4007 | if (mddev->ro==1) |
1da177e4 LT |
4008 | goto out; |
4009 | mddev->ro = 1; | |
9e653b63 N |
4010 | break; |
4011 | case 0: /* disassemble */ | |
4012 | case 2: /* stop */ | |
6b8b3e8a | 4013 | bitmap_flush(mddev); |
a9701a30 | 4014 | md_super_wait(mddev); |
1da177e4 LT |
4015 | if (mddev->ro) |
4016 | set_disk_ro(disk, 0); | |
4017 | blk_queue_make_request(mddev->queue, md_fail_request); | |
4018 | mddev->pers->stop(mddev); | |
d1b5380c N |
4019 | mddev->queue->merge_bvec_fn = NULL; |
4020 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 4021 | mddev->queue->backing_dev_info.congested_fn = NULL; |
0c3573f1 | 4022 | if (mddev->pers->sync_request) { |
411036fa | 4023 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
0c3573f1 N |
4024 | if (mddev->sysfs_action) |
4025 | sysfs_put(mddev->sysfs_action); | |
4026 | mddev->sysfs_action = NULL; | |
4027 | } | |
1da177e4 LT |
4028 | module_put(mddev->pers->owner); |
4029 | mddev->pers = NULL; | |
4f54b0e9 | 4030 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 4031 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 N |
4032 | |
4033 | set_capacity(disk, 0); | |
44ce6294 | 4034 | mddev->changed = 1; |
0d4ca600 | 4035 | |
1da177e4 LT |
4036 | if (mddev->ro) |
4037 | mddev->ro = 0; | |
4038 | } | |
850b2b42 | 4039 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
4040 | /* mark array as shutdown cleanly */ |
4041 | mddev->in_sync = 1; | |
850b2b42 | 4042 | md_update_sb(mddev, 1); |
1da177e4 | 4043 | } |
9e653b63 | 4044 | if (mode == 1) |
1da177e4 | 4045 | set_disk_ro(disk, 1); |
5fd6c1dc | 4046 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 4047 | } |
32a7627c | 4048 | |
1da177e4 LT |
4049 | /* |
4050 | * Free resources if final stop | |
4051 | */ | |
9e653b63 | 4052 | if (mode == 0) { |
86e6ffdd | 4053 | mdk_rdev_t *rdev; |
0d4ca600 | 4054 | |
1da177e4 LT |
4055 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4056 | ||
978f946b N |
4057 | bitmap_destroy(mddev); |
4058 | if (mddev->bitmap_file) { | |
acc55e22 | 4059 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
4060 | fput(mddev->bitmap_file); |
4061 | mddev->bitmap_file = NULL; | |
4062 | } | |
4063 | mddev->bitmap_offset = 0; | |
4064 | ||
159ec1fc | 4065 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4066 | if (rdev->raid_disk >= 0) { |
4067 | char nm[20]; | |
4068 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4069 | sysfs_remove_link(&mddev->kobj, nm); | |
4070 | } | |
4071 | ||
177a99b2 | 4072 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
4073 | flush_scheduled_work(); |
4074 | ||
1da177e4 LT |
4075 | export_array(mddev); |
4076 | ||
f233ea5c | 4077 | mddev->array_sectors = 0; |
9e653b63 N |
4078 | mddev->size = 0; |
4079 | mddev->raid_disks = 0; | |
a94213b1 | 4080 | mddev->recovery_cp = 0; |
5e96ee65 | 4081 | mddev->resync_min = 0; |
c6207277 | 4082 | mddev->resync_max = MaxSector; |
08a02ecd | 4083 | mddev->reshape_position = MaxSector; |
e691063a | 4084 | mddev->external = 0; |
1ec4a939 | 4085 | mddev->persistent = 0; |
d897dbf9 N |
4086 | mddev->level = LEVEL_NONE; |
4087 | mddev->clevel[0] = 0; | |
4088 | mddev->flags = 0; | |
4089 | mddev->ro = 0; | |
4090 | mddev->metadata_type[0] = 0; | |
4091 | mddev->chunk_size = 0; | |
4092 | mddev->ctime = mddev->utime = 0; | |
4093 | mddev->layout = 0; | |
4094 | mddev->max_disks = 0; | |
4095 | mddev->events = 0; | |
4096 | mddev->delta_disks = 0; | |
4097 | mddev->new_level = LEVEL_NONE; | |
4098 | mddev->new_layout = 0; | |
4099 | mddev->new_chunk = 0; | |
4100 | mddev->curr_resync = 0; | |
4101 | mddev->resync_mismatches = 0; | |
4102 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4103 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4104 | mddev->recovery = 0; | |
4105 | mddev->in_sync = 0; | |
4106 | mddev->changed = 0; | |
4107 | mddev->degraded = 0; | |
4108 | mddev->barriers_work = 0; | |
4109 | mddev->safemode = 0; | |
934d9c23 | 4110 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4111 | if (mddev->hold_active == UNTIL_STOP) |
4112 | mddev->hold_active = 0; | |
9e653b63 | 4113 | |
a8a55c38 | 4114 | } else if (mddev->pers) |
1da177e4 LT |
4115 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4116 | mdname(mddev)); | |
4117 | err = 0; | |
d7603b7e | 4118 | md_new_event(mddev); |
b62b7590 | 4119 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4120 | out: |
4121 | return err; | |
4122 | } | |
4123 | ||
fdee8ae4 | 4124 | #ifndef MODULE |
1da177e4 LT |
4125 | static void autorun_array(mddev_t *mddev) |
4126 | { | |
4127 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4128 | int err; |
4129 | ||
a757e64c | 4130 | if (list_empty(&mddev->disks)) |
1da177e4 | 4131 | return; |
1da177e4 LT |
4132 | |
4133 | printk(KERN_INFO "md: running: "); | |
4134 | ||
159ec1fc | 4135 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4136 | char b[BDEVNAME_SIZE]; |
4137 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4138 | } | |
4139 | printk("\n"); | |
4140 | ||
d710e138 | 4141 | err = do_md_run(mddev); |
1da177e4 LT |
4142 | if (err) { |
4143 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4144 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4145 | } |
4146 | } | |
4147 | ||
4148 | /* | |
4149 | * lets try to run arrays based on all disks that have arrived | |
4150 | * until now. (those are in pending_raid_disks) | |
4151 | * | |
4152 | * the method: pick the first pending disk, collect all disks with | |
4153 | * the same UUID, remove all from the pending list and put them into | |
4154 | * the 'same_array' list. Then order this list based on superblock | |
4155 | * update time (freshest comes first), kick out 'old' disks and | |
4156 | * compare superblocks. If everything's fine then run it. | |
4157 | * | |
4158 | * If "unit" is allocated, then bump its reference count | |
4159 | */ | |
4160 | static void autorun_devices(int part) | |
4161 | { | |
159ec1fc | 4162 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4163 | mddev_t *mddev; |
4164 | char b[BDEVNAME_SIZE]; | |
4165 | ||
4166 | printk(KERN_INFO "md: autorun ...\n"); | |
4167 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4168 | int unit; |
1da177e4 | 4169 | dev_t dev; |
ad01c9e3 | 4170 | LIST_HEAD(candidates); |
1da177e4 LT |
4171 | rdev0 = list_entry(pending_raid_disks.next, |
4172 | mdk_rdev_t, same_set); | |
4173 | ||
4174 | printk(KERN_INFO "md: considering %s ...\n", | |
4175 | bdevname(rdev0->bdev,b)); | |
4176 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4177 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4178 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4179 | printk(KERN_INFO "md: adding %s ...\n", | |
4180 | bdevname(rdev->bdev,b)); | |
4181 | list_move(&rdev->same_set, &candidates); | |
4182 | } | |
4183 | /* | |
4184 | * now we have a set of devices, with all of them having | |
4185 | * mostly sane superblocks. It's time to allocate the | |
4186 | * mddev. | |
4187 | */ | |
e8703fe1 N |
4188 | if (part) { |
4189 | dev = MKDEV(mdp_major, | |
4190 | rdev0->preferred_minor << MdpMinorShift); | |
4191 | unit = MINOR(dev) >> MdpMinorShift; | |
4192 | } else { | |
4193 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4194 | unit = MINOR(dev); | |
4195 | } | |
4196 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4197 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4198 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4199 | break; | |
4200 | } | |
1da177e4 LT |
4201 | |
4202 | md_probe(dev, NULL, NULL); | |
4203 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4204 | if (!mddev || !mddev->gendisk) { |
4205 | if (mddev) | |
4206 | mddev_put(mddev); | |
4207 | printk(KERN_ERR | |
1da177e4 LT |
4208 | "md: cannot allocate memory for md drive.\n"); |
4209 | break; | |
4210 | } | |
4211 | if (mddev_lock(mddev)) | |
4212 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4213 | mdname(mddev)); | |
4214 | else if (mddev->raid_disks || mddev->major_version | |
4215 | || !list_empty(&mddev->disks)) { | |
4216 | printk(KERN_WARNING | |
4217 | "md: %s already running, cannot run %s\n", | |
4218 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4219 | mddev_unlock(mddev); | |
4220 | } else { | |
4221 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4222 | mddev->persistent = 1; |
159ec1fc | 4223 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4224 | list_del_init(&rdev->same_set); |
4225 | if (bind_rdev_to_array(rdev, mddev)) | |
4226 | export_rdev(rdev); | |
4227 | } | |
4228 | autorun_array(mddev); | |
4229 | mddev_unlock(mddev); | |
4230 | } | |
4231 | /* on success, candidates will be empty, on error | |
4232 | * it won't... | |
4233 | */ | |
159ec1fc | 4234 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4235 | list_del_init(&rdev->same_set); |
1da177e4 | 4236 | export_rdev(rdev); |
4b80991c | 4237 | } |
1da177e4 LT |
4238 | mddev_put(mddev); |
4239 | } | |
4240 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4241 | } | |
fdee8ae4 | 4242 | #endif /* !MODULE */ |
1da177e4 | 4243 | |
1da177e4 LT |
4244 | static int get_version(void __user * arg) |
4245 | { | |
4246 | mdu_version_t ver; | |
4247 | ||
4248 | ver.major = MD_MAJOR_VERSION; | |
4249 | ver.minor = MD_MINOR_VERSION; | |
4250 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4251 | ||
4252 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4253 | return -EFAULT; | |
4254 | ||
4255 | return 0; | |
4256 | } | |
4257 | ||
4258 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4259 | { | |
4260 | mdu_array_info_t info; | |
4261 | int nr,working,active,failed,spare; | |
4262 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4263 | |
4264 | nr=working=active=failed=spare=0; | |
159ec1fc | 4265 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4266 | nr++; |
b2d444d7 | 4267 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4268 | failed++; |
4269 | else { | |
4270 | working++; | |
b2d444d7 | 4271 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4272 | active++; |
4273 | else | |
4274 | spare++; | |
4275 | } | |
4276 | } | |
4277 | ||
4278 | info.major_version = mddev->major_version; | |
4279 | info.minor_version = mddev->minor_version; | |
4280 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4281 | info.ctime = mddev->ctime; | |
4282 | info.level = mddev->level; | |
4283 | info.size = mddev->size; | |
284ae7ca N |
4284 | if (info.size != mddev->size) /* overflow */ |
4285 | info.size = -1; | |
1da177e4 LT |
4286 | info.nr_disks = nr; |
4287 | info.raid_disks = mddev->raid_disks; | |
4288 | info.md_minor = mddev->md_minor; | |
4289 | info.not_persistent= !mddev->persistent; | |
4290 | ||
4291 | info.utime = mddev->utime; | |
4292 | info.state = 0; | |
4293 | if (mddev->in_sync) | |
4294 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4295 | if (mddev->bitmap && mddev->bitmap_offset) |
4296 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4297 | info.active_disks = active; |
4298 | info.working_disks = working; | |
4299 | info.failed_disks = failed; | |
4300 | info.spare_disks = spare; | |
4301 | ||
4302 | info.layout = mddev->layout; | |
4303 | info.chunk_size = mddev->chunk_size; | |
4304 | ||
4305 | if (copy_to_user(arg, &info, sizeof(info))) | |
4306 | return -EFAULT; | |
4307 | ||
4308 | return 0; | |
4309 | } | |
4310 | ||
87162a28 | 4311 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4312 | { |
4313 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4314 | char *ptr, *buf = NULL; | |
4315 | int err = -ENOMEM; | |
4316 | ||
b5470dc5 DW |
4317 | if (md_allow_write(mddev)) |
4318 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4319 | else | |
4320 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4321 | |
32a7627c N |
4322 | if (!file) |
4323 | goto out; | |
4324 | ||
4325 | /* bitmap disabled, zero the first byte and copy out */ | |
4326 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4327 | file->pathname[0] = '\0'; | |
4328 | goto copy_out; | |
4329 | } | |
4330 | ||
4331 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4332 | if (!buf) | |
4333 | goto out; | |
4334 | ||
6bcfd601 CH |
4335 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4336 | if (IS_ERR(ptr)) | |
32a7627c N |
4337 | goto out; |
4338 | ||
4339 | strcpy(file->pathname, ptr); | |
4340 | ||
4341 | copy_out: | |
4342 | err = 0; | |
4343 | if (copy_to_user(arg, file, sizeof(*file))) | |
4344 | err = -EFAULT; | |
4345 | out: | |
4346 | kfree(buf); | |
4347 | kfree(file); | |
4348 | return err; | |
4349 | } | |
4350 | ||
1da177e4 LT |
4351 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4352 | { | |
4353 | mdu_disk_info_t info; | |
1da177e4 LT |
4354 | mdk_rdev_t *rdev; |
4355 | ||
4356 | if (copy_from_user(&info, arg, sizeof(info))) | |
4357 | return -EFAULT; | |
4358 | ||
26ef379f | 4359 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4360 | if (rdev) { |
4361 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4362 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4363 | info.raid_disk = rdev->raid_disk; | |
4364 | info.state = 0; | |
b2d444d7 | 4365 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4366 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4367 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4368 | info.state |= (1<<MD_DISK_ACTIVE); |
4369 | info.state |= (1<<MD_DISK_SYNC); | |
4370 | } | |
8ddf9efe N |
4371 | if (test_bit(WriteMostly, &rdev->flags)) |
4372 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4373 | } else { |
4374 | info.major = info.minor = 0; | |
4375 | info.raid_disk = -1; | |
4376 | info.state = (1<<MD_DISK_REMOVED); | |
4377 | } | |
4378 | ||
4379 | if (copy_to_user(arg, &info, sizeof(info))) | |
4380 | return -EFAULT; | |
4381 | ||
4382 | return 0; | |
4383 | } | |
4384 | ||
4385 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4386 | { | |
4387 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4388 | mdk_rdev_t *rdev; | |
4389 | dev_t dev = MKDEV(info->major,info->minor); | |
4390 | ||
4391 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4392 | return -EOVERFLOW; | |
4393 | ||
4394 | if (!mddev->raid_disks) { | |
4395 | int err; | |
4396 | /* expecting a device which has a superblock */ | |
4397 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4398 | if (IS_ERR(rdev)) { | |
4399 | printk(KERN_WARNING | |
4400 | "md: md_import_device returned %ld\n", | |
4401 | PTR_ERR(rdev)); | |
4402 | return PTR_ERR(rdev); | |
4403 | } | |
4404 | if (!list_empty(&mddev->disks)) { | |
4405 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4406 | mdk_rdev_t, same_set); | |
4407 | int err = super_types[mddev->major_version] | |
4408 | .load_super(rdev, rdev0, mddev->minor_version); | |
4409 | if (err < 0) { | |
4410 | printk(KERN_WARNING | |
4411 | "md: %s has different UUID to %s\n", | |
4412 | bdevname(rdev->bdev,b), | |
4413 | bdevname(rdev0->bdev,b2)); | |
4414 | export_rdev(rdev); | |
4415 | return -EINVAL; | |
4416 | } | |
4417 | } | |
4418 | err = bind_rdev_to_array(rdev, mddev); | |
4419 | if (err) | |
4420 | export_rdev(rdev); | |
4421 | return err; | |
4422 | } | |
4423 | ||
4424 | /* | |
4425 | * add_new_disk can be used once the array is assembled | |
4426 | * to add "hot spares". They must already have a superblock | |
4427 | * written | |
4428 | */ | |
4429 | if (mddev->pers) { | |
4430 | int err; | |
4431 | if (!mddev->pers->hot_add_disk) { | |
4432 | printk(KERN_WARNING | |
4433 | "%s: personality does not support diskops!\n", | |
4434 | mdname(mddev)); | |
4435 | return -EINVAL; | |
4436 | } | |
7b1e35f6 N |
4437 | if (mddev->persistent) |
4438 | rdev = md_import_device(dev, mddev->major_version, | |
4439 | mddev->minor_version); | |
4440 | else | |
4441 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4442 | if (IS_ERR(rdev)) { |
4443 | printk(KERN_WARNING | |
4444 | "md: md_import_device returned %ld\n", | |
4445 | PTR_ERR(rdev)); | |
4446 | return PTR_ERR(rdev); | |
4447 | } | |
41158c7e N |
4448 | /* set save_raid_disk if appropriate */ |
4449 | if (!mddev->persistent) { | |
4450 | if (info->state & (1<<MD_DISK_SYNC) && | |
4451 | info->raid_disk < mddev->raid_disks) | |
4452 | rdev->raid_disk = info->raid_disk; | |
4453 | else | |
4454 | rdev->raid_disk = -1; | |
4455 | } else | |
4456 | super_types[mddev->major_version]. | |
4457 | validate_super(mddev, rdev); | |
4458 | rdev->saved_raid_disk = rdev->raid_disk; | |
4459 | ||
b2d444d7 | 4460 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4461 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4462 | set_bit(WriteMostly, &rdev->flags); | |
4463 | ||
1da177e4 LT |
4464 | rdev->raid_disk = -1; |
4465 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4466 | if (!err && !mddev->pers->hot_remove_disk) { |
4467 | /* If there is hot_add_disk but no hot_remove_disk | |
4468 | * then added disks for geometry changes, | |
4469 | * and should be added immediately. | |
4470 | */ | |
4471 | super_types[mddev->major_version]. | |
4472 | validate_super(mddev, rdev); | |
4473 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4474 | if (err) | |
4475 | unbind_rdev_from_array(rdev); | |
4476 | } | |
1da177e4 LT |
4477 | if (err) |
4478 | export_rdev(rdev); | |
52664732 | 4479 | else |
3c0ee63a | 4480 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4481 | |
17571284 | 4482 | md_update_sb(mddev, 1); |
72a23c21 NB |
4483 | if (mddev->degraded) |
4484 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4485 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4486 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4487 | return err; |
4488 | } | |
4489 | ||
4490 | /* otherwise, add_new_disk is only allowed | |
4491 | * for major_version==0 superblocks | |
4492 | */ | |
4493 | if (mddev->major_version != 0) { | |
4494 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4495 | mdname(mddev)); | |
4496 | return -EINVAL; | |
4497 | } | |
4498 | ||
4499 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4500 | int err; | |
d710e138 | 4501 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4502 | if (IS_ERR(rdev)) { |
4503 | printk(KERN_WARNING | |
4504 | "md: error, md_import_device() returned %ld\n", | |
4505 | PTR_ERR(rdev)); | |
4506 | return PTR_ERR(rdev); | |
4507 | } | |
4508 | rdev->desc_nr = info->number; | |
4509 | if (info->raid_disk < mddev->raid_disks) | |
4510 | rdev->raid_disk = info->raid_disk; | |
4511 | else | |
4512 | rdev->raid_disk = -1; | |
4513 | ||
1da177e4 | 4514 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4515 | if (info->state & (1<<MD_DISK_SYNC)) |
4516 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4517 | |
8ddf9efe N |
4518 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4519 | set_bit(WriteMostly, &rdev->flags); | |
4520 | ||
1da177e4 LT |
4521 | if (!mddev->persistent) { |
4522 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4523 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4524 | } else |
0f420358 | 4525 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
e7debaa4 | 4526 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4527 | |
2bf071bf N |
4528 | err = bind_rdev_to_array(rdev, mddev); |
4529 | if (err) { | |
4530 | export_rdev(rdev); | |
4531 | return err; | |
4532 | } | |
1da177e4 LT |
4533 | } |
4534 | ||
4535 | return 0; | |
4536 | } | |
4537 | ||
4538 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4539 | { | |
4540 | char b[BDEVNAME_SIZE]; | |
4541 | mdk_rdev_t *rdev; | |
4542 | ||
1da177e4 LT |
4543 | rdev = find_rdev(mddev, dev); |
4544 | if (!rdev) | |
4545 | return -ENXIO; | |
4546 | ||
4547 | if (rdev->raid_disk >= 0) | |
4548 | goto busy; | |
4549 | ||
4550 | kick_rdev_from_array(rdev); | |
850b2b42 | 4551 | md_update_sb(mddev, 1); |
d7603b7e | 4552 | md_new_event(mddev); |
1da177e4 LT |
4553 | |
4554 | return 0; | |
4555 | busy: | |
fdefa4d8 | 4556 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4557 | bdevname(rdev->bdev,b), mdname(mddev)); |
4558 | return -EBUSY; | |
4559 | } | |
4560 | ||
4561 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4562 | { | |
4563 | char b[BDEVNAME_SIZE]; | |
4564 | int err; | |
1da177e4 LT |
4565 | mdk_rdev_t *rdev; |
4566 | ||
4567 | if (!mddev->pers) | |
4568 | return -ENODEV; | |
4569 | ||
4570 | if (mddev->major_version != 0) { | |
4571 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4572 | " version-0 superblocks.\n", | |
4573 | mdname(mddev)); | |
4574 | return -EINVAL; | |
4575 | } | |
4576 | if (!mddev->pers->hot_add_disk) { | |
4577 | printk(KERN_WARNING | |
4578 | "%s: personality does not support diskops!\n", | |
4579 | mdname(mddev)); | |
4580 | return -EINVAL; | |
4581 | } | |
4582 | ||
d710e138 | 4583 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4584 | if (IS_ERR(rdev)) { |
4585 | printk(KERN_WARNING | |
4586 | "md: error, md_import_device() returned %ld\n", | |
4587 | PTR_ERR(rdev)); | |
4588 | return -EINVAL; | |
4589 | } | |
4590 | ||
4591 | if (mddev->persistent) | |
0f420358 | 4592 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4593 | else |
0f420358 | 4594 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4595 | |
e7debaa4 | 4596 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4597 | |
b2d444d7 | 4598 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4599 | printk(KERN_WARNING |
4600 | "md: can not hot-add faulty %s disk to %s!\n", | |
4601 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4602 | err = -EINVAL; | |
4603 | goto abort_export; | |
4604 | } | |
b2d444d7 | 4605 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4606 | rdev->desc_nr = -1; |
5842730d | 4607 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4608 | err = bind_rdev_to_array(rdev, mddev); |
4609 | if (err) | |
4610 | goto abort_export; | |
1da177e4 LT |
4611 | |
4612 | /* | |
4613 | * The rest should better be atomic, we can have disk failures | |
4614 | * noticed in interrupt contexts ... | |
4615 | */ | |
4616 | ||
4617 | if (rdev->desc_nr == mddev->max_disks) { | |
4618 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4619 | mdname(mddev)); | |
4620 | err = -EBUSY; | |
4621 | goto abort_unbind_export; | |
4622 | } | |
4623 | ||
4624 | rdev->raid_disk = -1; | |
4625 | ||
850b2b42 | 4626 | md_update_sb(mddev, 1); |
1da177e4 LT |
4627 | |
4628 | /* | |
4629 | * Kick recovery, maybe this spare has to be added to the | |
4630 | * array immediately. | |
4631 | */ | |
4632 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4633 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4634 | md_new_event(mddev); |
1da177e4 LT |
4635 | return 0; |
4636 | ||
4637 | abort_unbind_export: | |
4638 | unbind_rdev_from_array(rdev); | |
4639 | ||
4640 | abort_export: | |
4641 | export_rdev(rdev); | |
4642 | return err; | |
4643 | } | |
4644 | ||
32a7627c N |
4645 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4646 | { | |
4647 | int err; | |
4648 | ||
36fa3063 N |
4649 | if (mddev->pers) { |
4650 | if (!mddev->pers->quiesce) | |
4651 | return -EBUSY; | |
4652 | if (mddev->recovery || mddev->sync_thread) | |
4653 | return -EBUSY; | |
4654 | /* we should be able to change the bitmap.. */ | |
4655 | } | |
32a7627c | 4656 | |
32a7627c | 4657 | |
36fa3063 N |
4658 | if (fd >= 0) { |
4659 | if (mddev->bitmap) | |
4660 | return -EEXIST; /* cannot add when bitmap is present */ | |
4661 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4662 | |
36fa3063 N |
4663 | if (mddev->bitmap_file == NULL) { |
4664 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4665 | mdname(mddev)); | |
4666 | return -EBADF; | |
4667 | } | |
4668 | ||
4669 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4670 | if (err) { | |
4671 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4672 | mdname(mddev)); | |
4673 | fput(mddev->bitmap_file); | |
4674 | mddev->bitmap_file = NULL; | |
4675 | return err; | |
4676 | } | |
a654b9d8 | 4677 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4678 | } else if (mddev->bitmap == NULL) |
4679 | return -ENOENT; /* cannot remove what isn't there */ | |
4680 | err = 0; | |
4681 | if (mddev->pers) { | |
4682 | mddev->pers->quiesce(mddev, 1); | |
4683 | if (fd >= 0) | |
4684 | err = bitmap_create(mddev); | |
d7375ab3 | 4685 | if (fd < 0 || err) { |
36fa3063 | 4686 | bitmap_destroy(mddev); |
d7375ab3 N |
4687 | fd = -1; /* make sure to put the file */ |
4688 | } | |
36fa3063 | 4689 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4690 | } |
4691 | if (fd < 0) { | |
acc55e22 N |
4692 | if (mddev->bitmap_file) { |
4693 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4694 | fput(mddev->bitmap_file); |
acc55e22 | 4695 | } |
36fa3063 N |
4696 | mddev->bitmap_file = NULL; |
4697 | } | |
4698 | ||
32a7627c N |
4699 | return err; |
4700 | } | |
4701 | ||
1da177e4 LT |
4702 | /* |
4703 | * set_array_info is used two different ways | |
4704 | * The original usage is when creating a new array. | |
4705 | * In this usage, raid_disks is > 0 and it together with | |
4706 | * level, size, not_persistent,layout,chunksize determine the | |
4707 | * shape of the array. | |
4708 | * This will always create an array with a type-0.90.0 superblock. | |
4709 | * The newer usage is when assembling an array. | |
4710 | * In this case raid_disks will be 0, and the major_version field is | |
4711 | * use to determine which style super-blocks are to be found on the devices. | |
4712 | * The minor and patch _version numbers are also kept incase the | |
4713 | * super_block handler wishes to interpret them. | |
4714 | */ | |
4715 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4716 | { | |
4717 | ||
4718 | if (info->raid_disks == 0) { | |
4719 | /* just setting version number for superblock loading */ | |
4720 | if (info->major_version < 0 || | |
50511da3 | 4721 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4722 | super_types[info->major_version].name == NULL) { |
4723 | /* maybe try to auto-load a module? */ | |
4724 | printk(KERN_INFO | |
4725 | "md: superblock version %d not known\n", | |
4726 | info->major_version); | |
4727 | return -EINVAL; | |
4728 | } | |
4729 | mddev->major_version = info->major_version; | |
4730 | mddev->minor_version = info->minor_version; | |
4731 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4732 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4733 | return 0; |
4734 | } | |
4735 | mddev->major_version = MD_MAJOR_VERSION; | |
4736 | mddev->minor_version = MD_MINOR_VERSION; | |
4737 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4738 | mddev->ctime = get_seconds(); | |
4739 | ||
4740 | mddev->level = info->level; | |
17115e03 | 4741 | mddev->clevel[0] = 0; |
1da177e4 LT |
4742 | mddev->size = info->size; |
4743 | mddev->raid_disks = info->raid_disks; | |
4744 | /* don't set md_minor, it is determined by which /dev/md* was | |
4745 | * openned | |
4746 | */ | |
4747 | if (info->state & (1<<MD_SB_CLEAN)) | |
4748 | mddev->recovery_cp = MaxSector; | |
4749 | else | |
4750 | mddev->recovery_cp = 0; | |
4751 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4752 | mddev->external = 0; |
1da177e4 LT |
4753 | |
4754 | mddev->layout = info->layout; | |
4755 | mddev->chunk_size = info->chunk_size; | |
4756 | ||
4757 | mddev->max_disks = MD_SB_DISKS; | |
4758 | ||
e691063a N |
4759 | if (mddev->persistent) |
4760 | mddev->flags = 0; | |
850b2b42 | 4761 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4762 | |
b2a2703c N |
4763 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4764 | mddev->bitmap_offset = 0; | |
4765 | ||
f6705578 N |
4766 | mddev->reshape_position = MaxSector; |
4767 | ||
1da177e4 LT |
4768 | /* |
4769 | * Generate a 128 bit UUID | |
4770 | */ | |
4771 | get_random_bytes(mddev->uuid, 16); | |
4772 | ||
f6705578 N |
4773 | mddev->new_level = mddev->level; |
4774 | mddev->new_chunk = mddev->chunk_size; | |
4775 | mddev->new_layout = mddev->layout; | |
4776 | mddev->delta_disks = 0; | |
4777 | ||
1da177e4 LT |
4778 | return 0; |
4779 | } | |
4780 | ||
d71f9f88 | 4781 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 4782 | { |
159ec1fc | 4783 | mdk_rdev_t *rdev; |
a35b0d69 | 4784 | int rv; |
d71f9f88 | 4785 | int fit = (num_sectors == 0); |
a35b0d69 N |
4786 | |
4787 | if (mddev->pers->resize == NULL) | |
4788 | return -EINVAL; | |
d71f9f88 AN |
4789 | /* The "num_sectors" is the number of sectors of each device that |
4790 | * is used. This can only make sense for arrays with redundancy. | |
4791 | * linear and raid0 always use whatever space is available. We can only | |
4792 | * consider changing this number if no resync or reconstruction is | |
4793 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 4794 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
4795 | * of each device. If num_sectors is zero, we find the largest size |
4796 | * that fits. | |
4797 | ||
a35b0d69 N |
4798 | */ |
4799 | if (mddev->sync_thread) | |
4800 | return -EBUSY; | |
dba034ee N |
4801 | if (mddev->bitmap) |
4802 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
4803 | * grow, and re-add. | |
4804 | */ | |
4805 | return -EBUSY; | |
159ec1fc | 4806 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
a35b0d69 | 4807 | sector_t avail; |
01ab5662 N |
4808 | avail = rdev->size * 2; |
4809 | ||
d71f9f88 AN |
4810 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
4811 | num_sectors = avail; | |
4812 | if (avail < num_sectors) | |
a35b0d69 N |
4813 | return -ENOSPC; |
4814 | } | |
d71f9f88 | 4815 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
4816 | if (!rv) { |
4817 | struct block_device *bdev; | |
4818 | ||
4819 | bdev = bdget_disk(mddev->gendisk, 0); | |
4820 | if (bdev) { | |
1b1dcc1b | 4821 | mutex_lock(&bdev->bd_inode->i_mutex); |
f233ea5c AN |
4822 | i_size_write(bdev->bd_inode, |
4823 | (loff_t)mddev->array_sectors << 9); | |
1b1dcc1b | 4824 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4825 | bdput(bdev); |
4826 | } | |
4827 | } | |
4828 | return rv; | |
4829 | } | |
4830 | ||
da943b99 N |
4831 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4832 | { | |
4833 | int rv; | |
4834 | /* change the number of raid disks */ | |
63c70c4f | 4835 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4836 | return -EINVAL; |
4837 | if (raid_disks <= 0 || | |
4838 | raid_disks >= mddev->max_disks) | |
4839 | return -EINVAL; | |
63c70c4f | 4840 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4841 | return -EBUSY; |
63c70c4f N |
4842 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4843 | ||
4844 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4845 | return rv; |
4846 | } | |
4847 | ||
4848 | ||
1da177e4 LT |
4849 | /* |
4850 | * update_array_info is used to change the configuration of an | |
4851 | * on-line array. | |
4852 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4853 | * fields in the info are checked against the array. | |
4854 | * Any differences that cannot be handled will cause an error. | |
4855 | * Normally, only one change can be managed at a time. | |
4856 | */ | |
4857 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4858 | { | |
4859 | int rv = 0; | |
4860 | int cnt = 0; | |
36fa3063 N |
4861 | int state = 0; |
4862 | ||
4863 | /* calculate expected state,ignoring low bits */ | |
4864 | if (mddev->bitmap && mddev->bitmap_offset) | |
4865 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4866 | |
4867 | if (mddev->major_version != info->major_version || | |
4868 | mddev->minor_version != info->minor_version || | |
4869 | /* mddev->patch_version != info->patch_version || */ | |
4870 | mddev->ctime != info->ctime || | |
4871 | mddev->level != info->level || | |
4872 | /* mddev->layout != info->layout || */ | |
4873 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4874 | mddev->chunk_size != info->chunk_size || |
4875 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4876 | ((state^info->state) & 0xfffffe00) | |
4877 | ) | |
1da177e4 LT |
4878 | return -EINVAL; |
4879 | /* Check there is only one change */ | |
284ae7ca | 4880 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4881 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4882 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4883 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4884 | if (cnt == 0) return 0; |
4885 | if (cnt > 1) return -EINVAL; | |
4886 | ||
4887 | if (mddev->layout != info->layout) { | |
4888 | /* Change layout | |
4889 | * we don't need to do anything at the md level, the | |
4890 | * personality will take care of it all. | |
4891 | */ | |
4892 | if (mddev->pers->reconfig == NULL) | |
4893 | return -EINVAL; | |
4894 | else | |
4895 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4896 | } | |
284ae7ca | 4897 | if (info->size >= 0 && mddev->size != info->size) |
d71f9f88 | 4898 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 4899 | |
da943b99 N |
4900 | if (mddev->raid_disks != info->raid_disks) |
4901 | rv = update_raid_disks(mddev, info->raid_disks); | |
4902 | ||
36fa3063 N |
4903 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4904 | if (mddev->pers->quiesce == NULL) | |
4905 | return -EINVAL; | |
4906 | if (mddev->recovery || mddev->sync_thread) | |
4907 | return -EBUSY; | |
4908 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4909 | /* add the bitmap */ | |
4910 | if (mddev->bitmap) | |
4911 | return -EEXIST; | |
4912 | if (mddev->default_bitmap_offset == 0) | |
4913 | return -EINVAL; | |
4914 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4915 | mddev->pers->quiesce(mddev, 1); | |
4916 | rv = bitmap_create(mddev); | |
4917 | if (rv) | |
4918 | bitmap_destroy(mddev); | |
4919 | mddev->pers->quiesce(mddev, 0); | |
4920 | } else { | |
4921 | /* remove the bitmap */ | |
4922 | if (!mddev->bitmap) | |
4923 | return -ENOENT; | |
4924 | if (mddev->bitmap->file) | |
4925 | return -EINVAL; | |
4926 | mddev->pers->quiesce(mddev, 1); | |
4927 | bitmap_destroy(mddev); | |
4928 | mddev->pers->quiesce(mddev, 0); | |
4929 | mddev->bitmap_offset = 0; | |
4930 | } | |
4931 | } | |
850b2b42 | 4932 | md_update_sb(mddev, 1); |
1da177e4 LT |
4933 | return rv; |
4934 | } | |
4935 | ||
4936 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4937 | { | |
4938 | mdk_rdev_t *rdev; | |
4939 | ||
4940 | if (mddev->pers == NULL) | |
4941 | return -ENODEV; | |
4942 | ||
4943 | rdev = find_rdev(mddev, dev); | |
4944 | if (!rdev) | |
4945 | return -ENODEV; | |
4946 | ||
4947 | md_error(mddev, rdev); | |
4948 | return 0; | |
4949 | } | |
4950 | ||
2f9618ce AN |
4951 | /* |
4952 | * We have a problem here : there is no easy way to give a CHS | |
4953 | * virtual geometry. We currently pretend that we have a 2 heads | |
4954 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4955 | * dosfs just mad... ;-) | |
4956 | */ | |
a885c8c4 CH |
4957 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4958 | { | |
4959 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4960 | ||
4961 | geo->heads = 2; | |
4962 | geo->sectors = 4; | |
4963 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4964 | return 0; | |
4965 | } | |
4966 | ||
a39907fa | 4967 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
4968 | unsigned int cmd, unsigned long arg) |
4969 | { | |
4970 | int err = 0; | |
4971 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4972 | mddev_t *mddev = NULL; |
4973 | ||
4974 | if (!capable(CAP_SYS_ADMIN)) | |
4975 | return -EACCES; | |
4976 | ||
4977 | /* | |
4978 | * Commands dealing with the RAID driver but not any | |
4979 | * particular array: | |
4980 | */ | |
4981 | switch (cmd) | |
4982 | { | |
4983 | case RAID_VERSION: | |
4984 | err = get_version(argp); | |
4985 | goto done; | |
4986 | ||
4987 | case PRINT_RAID_DEBUG: | |
4988 | err = 0; | |
4989 | md_print_devices(); | |
4990 | goto done; | |
4991 | ||
4992 | #ifndef MODULE | |
4993 | case RAID_AUTORUN: | |
4994 | err = 0; | |
4995 | autostart_arrays(arg); | |
4996 | goto done; | |
4997 | #endif | |
4998 | default:; | |
4999 | } | |
5000 | ||
5001 | /* | |
5002 | * Commands creating/starting a new array: | |
5003 | */ | |
5004 | ||
a39907fa | 5005 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5006 | |
5007 | if (!mddev) { | |
5008 | BUG(); | |
5009 | goto abort; | |
5010 | } | |
5011 | ||
1da177e4 LT |
5012 | err = mddev_lock(mddev); |
5013 | if (err) { | |
5014 | printk(KERN_INFO | |
5015 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5016 | err, cmd); | |
5017 | goto abort; | |
5018 | } | |
5019 | ||
5020 | switch (cmd) | |
5021 | { | |
5022 | case SET_ARRAY_INFO: | |
5023 | { | |
5024 | mdu_array_info_t info; | |
5025 | if (!arg) | |
5026 | memset(&info, 0, sizeof(info)); | |
5027 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5028 | err = -EFAULT; | |
5029 | goto abort_unlock; | |
5030 | } | |
5031 | if (mddev->pers) { | |
5032 | err = update_array_info(mddev, &info); | |
5033 | if (err) { | |
5034 | printk(KERN_WARNING "md: couldn't update" | |
5035 | " array info. %d\n", err); | |
5036 | goto abort_unlock; | |
5037 | } | |
5038 | goto done_unlock; | |
5039 | } | |
5040 | if (!list_empty(&mddev->disks)) { | |
5041 | printk(KERN_WARNING | |
5042 | "md: array %s already has disks!\n", | |
5043 | mdname(mddev)); | |
5044 | err = -EBUSY; | |
5045 | goto abort_unlock; | |
5046 | } | |
5047 | if (mddev->raid_disks) { | |
5048 | printk(KERN_WARNING | |
5049 | "md: array %s already initialised!\n", | |
5050 | mdname(mddev)); | |
5051 | err = -EBUSY; | |
5052 | goto abort_unlock; | |
5053 | } | |
5054 | err = set_array_info(mddev, &info); | |
5055 | if (err) { | |
5056 | printk(KERN_WARNING "md: couldn't set" | |
5057 | " array info. %d\n", err); | |
5058 | goto abort_unlock; | |
5059 | } | |
5060 | } | |
5061 | goto done_unlock; | |
5062 | ||
5063 | default:; | |
5064 | } | |
5065 | ||
5066 | /* | |
5067 | * Commands querying/configuring an existing array: | |
5068 | */ | |
32a7627c | 5069 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5070 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5071 | if ((!mddev->raid_disks && !mddev->external) |
5072 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5073 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5074 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5075 | err = -ENODEV; |
5076 | goto abort_unlock; | |
5077 | } | |
5078 | ||
5079 | /* | |
5080 | * Commands even a read-only array can execute: | |
5081 | */ | |
5082 | switch (cmd) | |
5083 | { | |
5084 | case GET_ARRAY_INFO: | |
5085 | err = get_array_info(mddev, argp); | |
5086 | goto done_unlock; | |
5087 | ||
32a7627c | 5088 | case GET_BITMAP_FILE: |
87162a28 | 5089 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5090 | goto done_unlock; |
5091 | ||
1da177e4 LT |
5092 | case GET_DISK_INFO: |
5093 | err = get_disk_info(mddev, argp); | |
5094 | goto done_unlock; | |
5095 | ||
5096 | case RESTART_ARRAY_RW: | |
5097 | err = restart_array(mddev); | |
5098 | goto done_unlock; | |
5099 | ||
5100 | case STOP_ARRAY: | |
d710e138 | 5101 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5102 | goto done_unlock; |
5103 | ||
5104 | case STOP_ARRAY_RO: | |
d710e138 | 5105 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
5106 | goto done_unlock; |
5107 | ||
1da177e4 LT |
5108 | } |
5109 | ||
5110 | /* | |
5111 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5112 | * superblock, so we do not allow them on read-only arrays. |
5113 | * However non-MD ioctls (e.g. get-size) will still come through | |
5114 | * here and hit the 'default' below, so only disallow | |
5115 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5116 | */ |
bb57fc64 | 5117 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5118 | if (mddev->ro == 2) { |
5119 | mddev->ro = 0; | |
b62b7590 | 5120 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5121 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5122 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5123 | } else { |
5124 | err = -EROFS; | |
5125 | goto abort_unlock; | |
5126 | } | |
1da177e4 LT |
5127 | } |
5128 | ||
5129 | switch (cmd) | |
5130 | { | |
5131 | case ADD_NEW_DISK: | |
5132 | { | |
5133 | mdu_disk_info_t info; | |
5134 | if (copy_from_user(&info, argp, sizeof(info))) | |
5135 | err = -EFAULT; | |
5136 | else | |
5137 | err = add_new_disk(mddev, &info); | |
5138 | goto done_unlock; | |
5139 | } | |
5140 | ||
5141 | case HOT_REMOVE_DISK: | |
5142 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5143 | goto done_unlock; | |
5144 | ||
5145 | case HOT_ADD_DISK: | |
5146 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5147 | goto done_unlock; | |
5148 | ||
5149 | case SET_DISK_FAULTY: | |
5150 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5151 | goto done_unlock; | |
5152 | ||
5153 | case RUN_ARRAY: | |
d710e138 | 5154 | err = do_md_run(mddev); |
1da177e4 LT |
5155 | goto done_unlock; |
5156 | ||
32a7627c N |
5157 | case SET_BITMAP_FILE: |
5158 | err = set_bitmap_file(mddev, (int)arg); | |
5159 | goto done_unlock; | |
5160 | ||
1da177e4 | 5161 | default: |
1da177e4 LT |
5162 | err = -EINVAL; |
5163 | goto abort_unlock; | |
5164 | } | |
5165 | ||
5166 | done_unlock: | |
5167 | abort_unlock: | |
d3374825 N |
5168 | if (mddev->hold_active == UNTIL_IOCTL && |
5169 | err != -EINVAL) | |
5170 | mddev->hold_active = 0; | |
1da177e4 LT |
5171 | mddev_unlock(mddev); |
5172 | ||
5173 | return err; | |
5174 | done: | |
5175 | if (err) | |
5176 | MD_BUG(); | |
5177 | abort: | |
5178 | return err; | |
5179 | } | |
5180 | ||
a39907fa | 5181 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5182 | { |
5183 | /* | |
5184 | * Succeed if we can lock the mddev, which confirms that | |
5185 | * it isn't being stopped right now. | |
5186 | */ | |
d3374825 | 5187 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5188 | int err; |
5189 | ||
d3374825 N |
5190 | if (mddev->gendisk != bdev->bd_disk) { |
5191 | /* we are racing with mddev_put which is discarding this | |
5192 | * bd_disk. | |
5193 | */ | |
5194 | mddev_put(mddev); | |
5195 | /* Wait until bdev->bd_disk is definitely gone */ | |
5196 | flush_scheduled_work(); | |
5197 | /* Then retry the open from the top */ | |
5198 | return -ERESTARTSYS; | |
5199 | } | |
5200 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5201 | ||
d63a5a74 | 5202 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5203 | goto out; |
5204 | ||
5205 | err = 0; | |
f2ea68cf | 5206 | atomic_inc(&mddev->openers); |
1da177e4 LT |
5207 | mddev_unlock(mddev); |
5208 | ||
a39907fa | 5209 | check_disk_change(bdev); |
1da177e4 LT |
5210 | out: |
5211 | return err; | |
5212 | } | |
5213 | ||
a39907fa | 5214 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5215 | { |
a39907fa | 5216 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5217 | |
52e5f9d1 | 5218 | BUG_ON(!mddev); |
f2ea68cf | 5219 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5220 | mddev_put(mddev); |
5221 | ||
5222 | return 0; | |
5223 | } | |
5224 | ||
44ce6294 LT |
5225 | static int md_media_changed(struct gendisk *disk) |
5226 | { | |
5227 | mddev_t *mddev = disk->private_data; | |
5228 | ||
5229 | return mddev->changed; | |
5230 | } | |
5231 | ||
5232 | static int md_revalidate(struct gendisk *disk) | |
5233 | { | |
5234 | mddev_t *mddev = disk->private_data; | |
5235 | ||
5236 | mddev->changed = 0; | |
5237 | return 0; | |
5238 | } | |
1da177e4 LT |
5239 | static struct block_device_operations md_fops = |
5240 | { | |
5241 | .owner = THIS_MODULE, | |
a39907fa AV |
5242 | .open = md_open, |
5243 | .release = md_release, | |
5244 | .locked_ioctl = md_ioctl, | |
a885c8c4 | 5245 | .getgeo = md_getgeo, |
44ce6294 LT |
5246 | .media_changed = md_media_changed, |
5247 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5248 | }; |
5249 | ||
75c96f85 | 5250 | static int md_thread(void * arg) |
1da177e4 LT |
5251 | { |
5252 | mdk_thread_t *thread = arg; | |
5253 | ||
1da177e4 LT |
5254 | /* |
5255 | * md_thread is a 'system-thread', it's priority should be very | |
5256 | * high. We avoid resource deadlocks individually in each | |
5257 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5258 | * the very same RT priority as kswapd, thus we will never get | |
5259 | * into a priority inversion deadlock. | |
5260 | * | |
5261 | * we definitely have to have equal or higher priority than | |
5262 | * bdflush, otherwise bdflush will deadlock if there are too | |
5263 | * many dirty RAID5 blocks. | |
5264 | */ | |
1da177e4 | 5265 | |
6985c43f | 5266 | allow_signal(SIGKILL); |
a6fb0934 | 5267 | while (!kthread_should_stop()) { |
1da177e4 | 5268 | |
93588e22 N |
5269 | /* We need to wait INTERRUPTIBLE so that |
5270 | * we don't add to the load-average. | |
5271 | * That means we need to be sure no signals are | |
5272 | * pending | |
5273 | */ | |
5274 | if (signal_pending(current)) | |
5275 | flush_signals(current); | |
5276 | ||
5277 | wait_event_interruptible_timeout | |
5278 | (thread->wqueue, | |
5279 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5280 | || kthread_should_stop(), | |
5281 | thread->timeout); | |
1da177e4 LT |
5282 | |
5283 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5284 | ||
787453c2 | 5285 | thread->run(thread->mddev); |
1da177e4 | 5286 | } |
a6fb0934 | 5287 | |
1da177e4 LT |
5288 | return 0; |
5289 | } | |
5290 | ||
5291 | void md_wakeup_thread(mdk_thread_t *thread) | |
5292 | { | |
5293 | if (thread) { | |
5294 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5295 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5296 | wake_up(&thread->wqueue); | |
5297 | } | |
5298 | } | |
5299 | ||
5300 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5301 | const char *name) | |
5302 | { | |
5303 | mdk_thread_t *thread; | |
1da177e4 | 5304 | |
9ffae0cf | 5305 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5306 | if (!thread) |
5307 | return NULL; | |
5308 | ||
1da177e4 LT |
5309 | init_waitqueue_head(&thread->wqueue); |
5310 | ||
1da177e4 LT |
5311 | thread->run = run; |
5312 | thread->mddev = mddev; | |
32a7627c | 5313 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5314 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5315 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5316 | kfree(thread); |
5317 | return NULL; | |
5318 | } | |
1da177e4 LT |
5319 | return thread; |
5320 | } | |
5321 | ||
1da177e4 LT |
5322 | void md_unregister_thread(mdk_thread_t *thread) |
5323 | { | |
ba25f9dc | 5324 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5325 | |
5326 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5327 | kfree(thread); |
5328 | } | |
5329 | ||
5330 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5331 | { | |
5332 | if (!mddev) { | |
5333 | MD_BUG(); | |
5334 | return; | |
5335 | } | |
5336 | ||
b2d444d7 | 5337 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5338 | return; |
6bfe0b49 DW |
5339 | |
5340 | if (mddev->external) | |
5341 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5342 | /* |
1da177e4 LT |
5343 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5344 | mdname(mddev), | |
5345 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5346 | __builtin_return_address(0),__builtin_return_address(1), | |
5347 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5348 | */ |
d0a0a5ee AM |
5349 | if (!mddev->pers) |
5350 | return; | |
1da177e4 LT |
5351 | if (!mddev->pers->error_handler) |
5352 | return; | |
5353 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5354 | if (mddev->degraded) |
5355 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5356 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5357 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5358 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5359 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5360 | md_new_event_inintr(mddev); |
1da177e4 LT |
5361 | } |
5362 | ||
5363 | /* seq_file implementation /proc/mdstat */ | |
5364 | ||
5365 | static void status_unused(struct seq_file *seq) | |
5366 | { | |
5367 | int i = 0; | |
5368 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5369 | |
5370 | seq_printf(seq, "unused devices: "); | |
5371 | ||
159ec1fc | 5372 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5373 | char b[BDEVNAME_SIZE]; |
5374 | i++; | |
5375 | seq_printf(seq, "%s ", | |
5376 | bdevname(rdev->bdev,b)); | |
5377 | } | |
5378 | if (!i) | |
5379 | seq_printf(seq, "<none>"); | |
5380 | ||
5381 | seq_printf(seq, "\n"); | |
5382 | } | |
5383 | ||
5384 | ||
5385 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5386 | { | |
4588b42e N |
5387 | sector_t max_blocks, resync, res; |
5388 | unsigned long dt, db, rt; | |
5389 | int scale; | |
5390 | unsigned int per_milli; | |
1da177e4 LT |
5391 | |
5392 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
5393 | ||
5394 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5395 | max_blocks = mddev->resync_max_sectors >> 1; | |
5396 | else | |
5397 | max_blocks = mddev->size; | |
5398 | ||
5399 | /* | |
5400 | * Should not happen. | |
5401 | */ | |
5402 | if (!max_blocks) { | |
5403 | MD_BUG(); | |
5404 | return; | |
5405 | } | |
4588b42e N |
5406 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
5407 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
5408 | * u32, as those are the requirements for sector_div. | |
5409 | * Thus 'scale' must be at least 10 | |
5410 | */ | |
5411 | scale = 10; | |
5412 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5413 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
5414 | scale++; | |
5415 | } | |
5416 | res = (resync>>scale)*1000; | |
5417 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
5418 | ||
5419 | per_milli = res; | |
1da177e4 | 5420 | { |
4588b42e | 5421 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5422 | seq_printf(seq, "["); |
5423 | for (i = 0; i < x; i++) | |
5424 | seq_printf(seq, "="); | |
5425 | seq_printf(seq, ">"); | |
5426 | for (i = 0; i < y; i++) | |
5427 | seq_printf(seq, "."); | |
5428 | seq_printf(seq, "] "); | |
5429 | } | |
4588b42e | 5430 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5431 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5432 | "reshape" : | |
61df9d91 N |
5433 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5434 | "check" : | |
5435 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5436 | "resync" : "recovery"))), | |
5437 | per_milli/10, per_milli % 10, | |
4588b42e N |
5438 | (unsigned long long) resync, |
5439 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5440 | |
5441 | /* | |
5442 | * We do not want to overflow, so the order of operands and | |
5443 | * the * 100 / 100 trick are important. We do a +1 to be | |
5444 | * safe against division by zero. We only estimate anyway. | |
5445 | * | |
5446 | * dt: time from mark until now | |
5447 | * db: blocks written from mark until now | |
5448 | * rt: remaining time | |
5449 | */ | |
5450 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5451 | if (!dt) dt++; | |
ff4e8d9a N |
5452 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5453 | - mddev->resync_mark_cnt; | |
5454 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5455 | |
5456 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5457 | ||
ff4e8d9a | 5458 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5459 | } |
5460 | ||
5461 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5462 | { | |
5463 | struct list_head *tmp; | |
5464 | loff_t l = *pos; | |
5465 | mddev_t *mddev; | |
5466 | ||
5467 | if (l >= 0x10000) | |
5468 | return NULL; | |
5469 | if (!l--) | |
5470 | /* header */ | |
5471 | return (void*)1; | |
5472 | ||
5473 | spin_lock(&all_mddevs_lock); | |
5474 | list_for_each(tmp,&all_mddevs) | |
5475 | if (!l--) { | |
5476 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5477 | mddev_get(mddev); | |
5478 | spin_unlock(&all_mddevs_lock); | |
5479 | return mddev; | |
5480 | } | |
5481 | spin_unlock(&all_mddevs_lock); | |
5482 | if (!l--) | |
5483 | return (void*)2;/* tail */ | |
5484 | return NULL; | |
5485 | } | |
5486 | ||
5487 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5488 | { | |
5489 | struct list_head *tmp; | |
5490 | mddev_t *next_mddev, *mddev = v; | |
5491 | ||
5492 | ++*pos; | |
5493 | if (v == (void*)2) | |
5494 | return NULL; | |
5495 | ||
5496 | spin_lock(&all_mddevs_lock); | |
5497 | if (v == (void*)1) | |
5498 | tmp = all_mddevs.next; | |
5499 | else | |
5500 | tmp = mddev->all_mddevs.next; | |
5501 | if (tmp != &all_mddevs) | |
5502 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5503 | else { | |
5504 | next_mddev = (void*)2; | |
5505 | *pos = 0x10000; | |
5506 | } | |
5507 | spin_unlock(&all_mddevs_lock); | |
5508 | ||
5509 | if (v != (void*)1) | |
5510 | mddev_put(mddev); | |
5511 | return next_mddev; | |
5512 | ||
5513 | } | |
5514 | ||
5515 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5516 | { | |
5517 | mddev_t *mddev = v; | |
5518 | ||
5519 | if (mddev && v != (void*)1 && v != (void*)2) | |
5520 | mddev_put(mddev); | |
5521 | } | |
5522 | ||
d7603b7e N |
5523 | struct mdstat_info { |
5524 | int event; | |
5525 | }; | |
5526 | ||
1da177e4 LT |
5527 | static int md_seq_show(struct seq_file *seq, void *v) |
5528 | { | |
5529 | mddev_t *mddev = v; | |
5530 | sector_t size; | |
1da177e4 | 5531 | mdk_rdev_t *rdev; |
d7603b7e | 5532 | struct mdstat_info *mi = seq->private; |
32a7627c | 5533 | struct bitmap *bitmap; |
1da177e4 LT |
5534 | |
5535 | if (v == (void*)1) { | |
2604b703 | 5536 | struct mdk_personality *pers; |
1da177e4 LT |
5537 | seq_printf(seq, "Personalities : "); |
5538 | spin_lock(&pers_lock); | |
2604b703 N |
5539 | list_for_each_entry(pers, &pers_list, list) |
5540 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5541 | |
5542 | spin_unlock(&pers_lock); | |
5543 | seq_printf(seq, "\n"); | |
d7603b7e | 5544 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5545 | return 0; |
5546 | } | |
5547 | if (v == (void*)2) { | |
5548 | status_unused(seq); | |
5549 | return 0; | |
5550 | } | |
5551 | ||
5dc5cf7d | 5552 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5553 | return -EINTR; |
5dc5cf7d | 5554 | |
1da177e4 LT |
5555 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5556 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5557 | mddev->pers ? "" : "in"); | |
5558 | if (mddev->pers) { | |
f91de92e | 5559 | if (mddev->ro==1) |
1da177e4 | 5560 | seq_printf(seq, " (read-only)"); |
f91de92e | 5561 | if (mddev->ro==2) |
52720ae7 | 5562 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5563 | seq_printf(seq, " %s", mddev->pers->name); |
5564 | } | |
5565 | ||
5566 | size = 0; | |
159ec1fc | 5567 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5568 | char b[BDEVNAME_SIZE]; |
5569 | seq_printf(seq, " %s[%d]", | |
5570 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5571 | if (test_bit(WriteMostly, &rdev->flags)) |
5572 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5573 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5574 | seq_printf(seq, "(F)"); |
5575 | continue; | |
b325a32e N |
5576 | } else if (rdev->raid_disk < 0) |
5577 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
5578 | size += rdev->size; |
5579 | } | |
5580 | ||
5581 | if (!list_empty(&mddev->disks)) { | |
5582 | if (mddev->pers) | |
5583 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
5584 | (unsigned long long) |
5585 | mddev->array_sectors / 2); | |
1da177e4 LT |
5586 | else |
5587 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c | 5588 | (unsigned long long)size); |
1da177e4 | 5589 | } |
1cd6bf19 N |
5590 | if (mddev->persistent) { |
5591 | if (mddev->major_version != 0 || | |
5592 | mddev->minor_version != 90) { | |
5593 | seq_printf(seq," super %d.%d", | |
5594 | mddev->major_version, | |
5595 | mddev->minor_version); | |
5596 | } | |
e691063a N |
5597 | } else if (mddev->external) |
5598 | seq_printf(seq, " super external:%s", | |
5599 | mddev->metadata_type); | |
5600 | else | |
1cd6bf19 | 5601 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5602 | |
5603 | if (mddev->pers) { | |
d710e138 | 5604 | mddev->pers->status(seq, mddev); |
1da177e4 | 5605 | seq_printf(seq, "\n "); |
8e1b39d6 N |
5606 | if (mddev->pers->sync_request) { |
5607 | if (mddev->curr_resync > 2) { | |
d710e138 | 5608 | status_resync(seq, mddev); |
8e1b39d6 N |
5609 | seq_printf(seq, "\n "); |
5610 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5611 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5612 | else if (mddev->recovery_cp < MaxSector) | |
5613 | seq_printf(seq, "\tresync=PENDING\n "); | |
5614 | } | |
32a7627c N |
5615 | } else |
5616 | seq_printf(seq, "\n "); | |
5617 | ||
5618 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5619 | unsigned long chunk_kb; |
5620 | unsigned long flags; | |
32a7627c N |
5621 | spin_lock_irqsave(&bitmap->lock, flags); |
5622 | chunk_kb = bitmap->chunksize >> 10; | |
5623 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5624 | "%lu%s chunk", | |
5625 | bitmap->pages - bitmap->missing_pages, | |
5626 | bitmap->pages, | |
5627 | (bitmap->pages - bitmap->missing_pages) | |
5628 | << (PAGE_SHIFT - 10), | |
5629 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5630 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5631 | if (bitmap->file) { |
5632 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5633 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5634 | } |
78d742d8 | 5635 | |
32a7627c N |
5636 | seq_printf(seq, "\n"); |
5637 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5638 | } |
5639 | ||
5640 | seq_printf(seq, "\n"); | |
5641 | } | |
5642 | mddev_unlock(mddev); | |
5643 | ||
5644 | return 0; | |
5645 | } | |
5646 | ||
5647 | static struct seq_operations md_seq_ops = { | |
5648 | .start = md_seq_start, | |
5649 | .next = md_seq_next, | |
5650 | .stop = md_seq_stop, | |
5651 | .show = md_seq_show, | |
5652 | }; | |
5653 | ||
5654 | static int md_seq_open(struct inode *inode, struct file *file) | |
5655 | { | |
5656 | int error; | |
d7603b7e N |
5657 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5658 | if (mi == NULL) | |
5659 | return -ENOMEM; | |
1da177e4 LT |
5660 | |
5661 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5662 | if (error) |
5663 | kfree(mi); | |
5664 | else { | |
5665 | struct seq_file *p = file->private_data; | |
5666 | p->private = mi; | |
5667 | mi->event = atomic_read(&md_event_count); | |
5668 | } | |
1da177e4 LT |
5669 | return error; |
5670 | } | |
5671 | ||
d7603b7e N |
5672 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5673 | { | |
5674 | struct seq_file *m = filp->private_data; | |
5675 | struct mdstat_info *mi = m->private; | |
5676 | int mask; | |
5677 | ||
5678 | poll_wait(filp, &md_event_waiters, wait); | |
5679 | ||
5680 | /* always allow read */ | |
5681 | mask = POLLIN | POLLRDNORM; | |
5682 | ||
5683 | if (mi->event != atomic_read(&md_event_count)) | |
5684 | mask |= POLLERR | POLLPRI; | |
5685 | return mask; | |
5686 | } | |
5687 | ||
fa027c2a | 5688 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5689 | .owner = THIS_MODULE, |
1da177e4 LT |
5690 | .open = md_seq_open, |
5691 | .read = seq_read, | |
5692 | .llseek = seq_lseek, | |
c3f94b40 | 5693 | .release = seq_release_private, |
d7603b7e | 5694 | .poll = mdstat_poll, |
1da177e4 LT |
5695 | }; |
5696 | ||
2604b703 | 5697 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5698 | { |
1da177e4 | 5699 | spin_lock(&pers_lock); |
2604b703 N |
5700 | list_add_tail(&p->list, &pers_list); |
5701 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5702 | spin_unlock(&pers_lock); |
5703 | return 0; | |
5704 | } | |
5705 | ||
2604b703 | 5706 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5707 | { |
2604b703 | 5708 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5709 | spin_lock(&pers_lock); |
2604b703 | 5710 | list_del_init(&p->list); |
1da177e4 LT |
5711 | spin_unlock(&pers_lock); |
5712 | return 0; | |
5713 | } | |
5714 | ||
5715 | static int is_mddev_idle(mddev_t *mddev) | |
5716 | { | |
5717 | mdk_rdev_t * rdev; | |
1da177e4 | 5718 | int idle; |
713f6ab1 | 5719 | long curr_events; |
1da177e4 LT |
5720 | |
5721 | idle = 1; | |
4b80991c N |
5722 | rcu_read_lock(); |
5723 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5724 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
074a7aca TH |
5725 | curr_events = part_stat_read(&disk->part0, sectors[0]) + |
5726 | part_stat_read(&disk->part0, sectors[1]) - | |
1da177e4 | 5727 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5728 | /* sync IO will cause sync_io to increase before the disk_stats |
5729 | * as sync_io is counted when a request starts, and | |
5730 | * disk_stats is counted when it completes. | |
5731 | * So resync activity will cause curr_events to be smaller than | |
5732 | * when there was no such activity. | |
5733 | * non-sync IO will cause disk_stat to increase without | |
5734 | * increasing sync_io so curr_events will (eventually) | |
5735 | * be larger than it was before. Once it becomes | |
5736 | * substantially larger, the test below will cause | |
5737 | * the array to appear non-idle, and resync will slow | |
5738 | * down. | |
5739 | * If there is a lot of outstanding resync activity when | |
5740 | * we set last_event to curr_events, then all that activity | |
5741 | * completing might cause the array to appear non-idle | |
5742 | * and resync will be slowed down even though there might | |
5743 | * not have been non-resync activity. This will only | |
5744 | * happen once though. 'last_events' will soon reflect | |
5745 | * the state where there is little or no outstanding | |
5746 | * resync requests, and further resync activity will | |
5747 | * always make curr_events less than last_events. | |
c0e48521 | 5748 | * |
1da177e4 | 5749 | */ |
713f6ab1 | 5750 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5751 | rdev->last_events = curr_events; |
5752 | idle = 0; | |
5753 | } | |
5754 | } | |
4b80991c | 5755 | rcu_read_unlock(); |
1da177e4 LT |
5756 | return idle; |
5757 | } | |
5758 | ||
5759 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5760 | { | |
5761 | /* another "blocks" (512byte) blocks have been synced */ | |
5762 | atomic_sub(blocks, &mddev->recovery_active); | |
5763 | wake_up(&mddev->recovery_wait); | |
5764 | if (!ok) { | |
dfc70645 | 5765 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5766 | md_wakeup_thread(mddev->thread); |
5767 | // stop recovery, signal do_sync .... | |
5768 | } | |
5769 | } | |
5770 | ||
5771 | ||
06d91a5f N |
5772 | /* md_write_start(mddev, bi) |
5773 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5774 | * in superblock) before writing, schedule a superblock update |
5775 | * and wait for it to complete. | |
06d91a5f | 5776 | */ |
3d310eb7 | 5777 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5778 | { |
0fd62b86 | 5779 | int did_change = 0; |
06d91a5f | 5780 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5781 | return; |
06d91a5f | 5782 | |
f91de92e N |
5783 | BUG_ON(mddev->ro == 1); |
5784 | if (mddev->ro == 2) { | |
5785 | /* need to switch to read/write */ | |
5786 | mddev->ro = 0; | |
5787 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5788 | md_wakeup_thread(mddev->thread); | |
25156198 | 5789 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 5790 | did_change = 1; |
f91de92e | 5791 | } |
06d91a5f | 5792 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
5793 | if (mddev->safemode == 1) |
5794 | mddev->safemode = 0; | |
06d91a5f | 5795 | if (mddev->in_sync) { |
a9701a30 | 5796 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5797 | if (mddev->in_sync) { |
5798 | mddev->in_sync = 0; | |
850b2b42 | 5799 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 5800 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 5801 | did_change = 1; |
3d310eb7 | 5802 | } |
a9701a30 | 5803 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5804 | } |
0fd62b86 | 5805 | if (did_change) |
b62b7590 | 5806 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
5807 | wait_event(mddev->sb_wait, |
5808 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
5809 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
5810 | } |
5811 | ||
5812 | void md_write_end(mddev_t *mddev) | |
5813 | { | |
5814 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5815 | if (mddev->safemode == 2) | |
5816 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5817 | else if (mddev->safemode_delay) |
1da177e4 LT |
5818 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5819 | } | |
5820 | } | |
5821 | ||
2a2275d6 N |
5822 | /* md_allow_write(mddev) |
5823 | * Calling this ensures that the array is marked 'active' so that writes | |
5824 | * may proceed without blocking. It is important to call this before | |
5825 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5826 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
5827 | * |
5828 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
5829 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 5830 | */ |
b5470dc5 | 5831 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
5832 | { |
5833 | if (!mddev->pers) | |
b5470dc5 | 5834 | return 0; |
2a2275d6 | 5835 | if (mddev->ro) |
b5470dc5 | 5836 | return 0; |
1a0fd497 | 5837 | if (!mddev->pers->sync_request) |
b5470dc5 | 5838 | return 0; |
2a2275d6 N |
5839 | |
5840 | spin_lock_irq(&mddev->write_lock); | |
5841 | if (mddev->in_sync) { | |
5842 | mddev->in_sync = 0; | |
5843 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5844 | if (mddev->safemode_delay && | |
5845 | mddev->safemode == 0) | |
5846 | mddev->safemode = 1; | |
5847 | spin_unlock_irq(&mddev->write_lock); | |
5848 | md_update_sb(mddev, 0); | |
b62b7590 | 5849 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
5850 | } else |
5851 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
5852 | |
5853 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
5854 | return -EAGAIN; | |
5855 | else | |
5856 | return 0; | |
2a2275d6 N |
5857 | } |
5858 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5859 | ||
1da177e4 LT |
5860 | #define SYNC_MARKS 10 |
5861 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5862 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5863 | { |
5864 | mddev_t *mddev2; | |
5865 | unsigned int currspeed = 0, | |
5866 | window; | |
57afd89f | 5867 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5868 | unsigned long mark[SYNC_MARKS]; |
5869 | sector_t mark_cnt[SYNC_MARKS]; | |
5870 | int last_mark,m; | |
5871 | struct list_head *tmp; | |
5872 | sector_t last_check; | |
57afd89f | 5873 | int skipped = 0; |
5fd6c1dc | 5874 | mdk_rdev_t *rdev; |
61df9d91 | 5875 | char *desc; |
1da177e4 LT |
5876 | |
5877 | /* just incase thread restarts... */ | |
5878 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5879 | return; | |
5fd6c1dc N |
5880 | if (mddev->ro) /* never try to sync a read-only array */ |
5881 | return; | |
1da177e4 | 5882 | |
61df9d91 N |
5883 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5884 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5885 | desc = "data-check"; | |
5886 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5887 | desc = "requested-resync"; | |
5888 | else | |
5889 | desc = "resync"; | |
5890 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5891 | desc = "reshape"; | |
5892 | else | |
5893 | desc = "recovery"; | |
5894 | ||
1da177e4 LT |
5895 | /* we overload curr_resync somewhat here. |
5896 | * 0 == not engaged in resync at all | |
5897 | * 2 == checking that there is no conflict with another sync | |
5898 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5899 | * commense | |
5900 | * other == active in resync - this many blocks | |
5901 | * | |
5902 | * Before starting a resync we must have set curr_resync to | |
5903 | * 2, and then checked that every "conflicting" array has curr_resync | |
5904 | * less than ours. When we find one that is the same or higher | |
5905 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5906 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5907 | * This will mean we have to start checking from the beginning again. | |
5908 | * | |
5909 | */ | |
5910 | ||
5911 | do { | |
5912 | mddev->curr_resync = 2; | |
5913 | ||
5914 | try_again: | |
787453c2 | 5915 | if (kthread_should_stop()) { |
6985c43f | 5916 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5917 | goto skip; |
5918 | } | |
29ac4aa3 | 5919 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
5920 | if (mddev2 == mddev) |
5921 | continue; | |
90b08710 BS |
5922 | if (!mddev->parallel_resync |
5923 | && mddev2->curr_resync | |
5924 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
5925 | DEFINE_WAIT(wq); |
5926 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5927 | /* arbitrarily yield */ | |
5928 | mddev->curr_resync = 1; | |
5929 | wake_up(&resync_wait); | |
5930 | } | |
5931 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5932 | /* no need to wait here, we can wait the next | |
5933 | * time 'round when curr_resync == 2 | |
5934 | */ | |
5935 | continue; | |
9744197c N |
5936 | /* We need to wait 'interruptible' so as not to |
5937 | * contribute to the load average, and not to | |
5938 | * be caught by 'softlockup' | |
5939 | */ | |
5940 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 5941 | if (!kthread_should_stop() && |
8712e553 | 5942 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5943 | printk(KERN_INFO "md: delaying %s of %s" |
5944 | " until %s has finished (they" | |
1da177e4 | 5945 | " share one or more physical units)\n", |
61df9d91 | 5946 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 5947 | mddev_put(mddev2); |
9744197c N |
5948 | if (signal_pending(current)) |
5949 | flush_signals(current); | |
1da177e4 LT |
5950 | schedule(); |
5951 | finish_wait(&resync_wait, &wq); | |
5952 | goto try_again; | |
5953 | } | |
5954 | finish_wait(&resync_wait, &wq); | |
5955 | } | |
5956 | } | |
5957 | } while (mddev->curr_resync < 2); | |
5958 | ||
5fd6c1dc | 5959 | j = 0; |
9d88883e | 5960 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5961 | /* resync follows the size requested by the personality, |
57afd89f | 5962 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5963 | */ |
5964 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5965 | mddev->resync_mismatches = 0; |
5fd6c1dc | 5966 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
5967 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
5968 | j = mddev->resync_min; | |
5969 | else if (!mddev->bitmap) | |
5fd6c1dc | 5970 | j = mddev->recovery_cp; |
5e96ee65 | 5971 | |
ccfcc3c1 N |
5972 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5973 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5974 | else { |
1da177e4 LT |
5975 | /* recovery follows the physical size of devices */ |
5976 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5977 | j = MaxSector; |
159ec1fc | 5978 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
5979 | if (rdev->raid_disk >= 0 && |
5980 | !test_bit(Faulty, &rdev->flags) && | |
5981 | !test_bit(In_sync, &rdev->flags) && | |
5982 | rdev->recovery_offset < j) | |
5983 | j = rdev->recovery_offset; | |
5984 | } | |
1da177e4 | 5985 | |
61df9d91 N |
5986 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5987 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5988 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5989 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5990 | "(but not more than %d KB/sec) for %s.\n", |
5991 | speed_max(mddev), desc); | |
1da177e4 LT |
5992 | |
5993 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5994 | |
57afd89f | 5995 | io_sectors = 0; |
1da177e4 LT |
5996 | for (m = 0; m < SYNC_MARKS; m++) { |
5997 | mark[m] = jiffies; | |
57afd89f | 5998 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5999 | } |
6000 | last_mark = 0; | |
6001 | mddev->resync_mark = mark[last_mark]; | |
6002 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6003 | ||
6004 | /* | |
6005 | * Tune reconstruction: | |
6006 | */ | |
6007 | window = 32*(PAGE_SIZE/512); | |
6008 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6009 | window/2,(unsigned long long) max_sectors/2); | |
6010 | ||
6011 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6012 | last_check = 0; |
6013 | ||
6014 | if (j>2) { | |
6015 | printk(KERN_INFO | |
61df9d91 N |
6016 | "md: resuming %s of %s from checkpoint.\n", |
6017 | desc, mdname(mddev)); | |
1da177e4 LT |
6018 | mddev->curr_resync = j; |
6019 | } | |
6020 | ||
6021 | while (j < max_sectors) { | |
57afd89f | 6022 | sector_t sectors; |
1da177e4 | 6023 | |
57afd89f | 6024 | skipped = 0; |
c6207277 N |
6025 | if (j >= mddev->resync_max) { |
6026 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
6027 | wait_event(mddev->recovery_wait, | |
6028 | mddev->resync_max > j | |
6029 | || kthread_should_stop()); | |
6030 | } | |
6031 | if (kthread_should_stop()) | |
6032 | goto interrupted; | |
57afd89f | 6033 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6034 | currspeed < speed_min(mddev)); |
57afd89f | 6035 | if (sectors == 0) { |
dfc70645 | 6036 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6037 | goto out; |
6038 | } | |
57afd89f N |
6039 | |
6040 | if (!skipped) { /* actual IO requested */ | |
6041 | io_sectors += sectors; | |
6042 | atomic_add(sectors, &mddev->recovery_active); | |
6043 | } | |
6044 | ||
1da177e4 LT |
6045 | j += sectors; |
6046 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6047 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6048 | if (last_check == 0) |
6049 | /* this is the earliers that rebuilt will be | |
6050 | * visible in /proc/mdstat | |
6051 | */ | |
6052 | md_new_event(mddev); | |
57afd89f N |
6053 | |
6054 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6055 | continue; |
6056 | ||
57afd89f | 6057 | last_check = io_sectors; |
1da177e4 | 6058 | |
dfc70645 | 6059 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6060 | break; |
6061 | ||
6062 | repeat: | |
6063 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6064 | /* step marks */ | |
6065 | int next = (last_mark+1) % SYNC_MARKS; | |
6066 | ||
6067 | mddev->resync_mark = mark[next]; | |
6068 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6069 | mark[next] = jiffies; | |
57afd89f | 6070 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6071 | last_mark = next; |
6072 | } | |
6073 | ||
6074 | ||
c6207277 N |
6075 | if (kthread_should_stop()) |
6076 | goto interrupted; | |
6077 | ||
1da177e4 LT |
6078 | |
6079 | /* | |
6080 | * this loop exits only if either when we are slower than | |
6081 | * the 'hard' speed limit, or the system was IO-idle for | |
6082 | * a jiffy. | |
6083 | * the system might be non-idle CPU-wise, but we only care | |
6084 | * about not overloading the IO subsystem. (things like an | |
6085 | * e2fsck being done on the RAID array should execute fast) | |
6086 | */ | |
2ad8b1ef | 6087 | blk_unplug(mddev->queue); |
1da177e4 LT |
6088 | cond_resched(); |
6089 | ||
57afd89f N |
6090 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6091 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6092 | |
88202a0c N |
6093 | if (currspeed > speed_min(mddev)) { |
6094 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 6095 | !is_mddev_idle(mddev)) { |
c0e48521 | 6096 | msleep(500); |
1da177e4 LT |
6097 | goto repeat; |
6098 | } | |
6099 | } | |
6100 | } | |
61df9d91 | 6101 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6102 | /* |
6103 | * this also signals 'finished resyncing' to md_stop | |
6104 | */ | |
6105 | out: | |
2ad8b1ef | 6106 | blk_unplug(mddev->queue); |
1da177e4 LT |
6107 | |
6108 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6109 | ||
6110 | /* tell personality that we are finished */ | |
57afd89f | 6111 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6112 | |
dfc70645 | 6113 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6114 | mddev->curr_resync > 2) { |
6115 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6116 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6117 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6118 | printk(KERN_INFO | |
61df9d91 N |
6119 | "md: checkpointing %s of %s.\n", |
6120 | desc, mdname(mddev)); | |
5fd6c1dc N |
6121 | mddev->recovery_cp = mddev->curr_resync; |
6122 | } | |
6123 | } else | |
6124 | mddev->recovery_cp = MaxSector; | |
6125 | } else { | |
6126 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6127 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6128 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6129 | if (rdev->raid_disk >= 0 && |
6130 | !test_bit(Faulty, &rdev->flags) && | |
6131 | !test_bit(In_sync, &rdev->flags) && | |
6132 | rdev->recovery_offset < mddev->curr_resync) | |
6133 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6134 | } |
1da177e4 | 6135 | } |
17571284 | 6136 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6137 | |
1da177e4 LT |
6138 | skip: |
6139 | mddev->curr_resync = 0; | |
5e96ee65 | 6140 | mddev->resync_min = 0; |
c6207277 N |
6141 | mddev->resync_max = MaxSector; |
6142 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
6143 | wake_up(&resync_wait); |
6144 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6145 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6146 | return; |
6147 | ||
6148 | interrupted: | |
6149 | /* | |
6150 | * got a signal, exit. | |
6151 | */ | |
6152 | printk(KERN_INFO | |
6153 | "md: md_do_sync() got signal ... exiting\n"); | |
6154 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6155 | goto out; | |
6156 | ||
1da177e4 | 6157 | } |
29269553 | 6158 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6159 | |
6160 | ||
b4c4c7b8 N |
6161 | static int remove_and_add_spares(mddev_t *mddev) |
6162 | { | |
6163 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6164 | int spares = 0; |
6165 | ||
159ec1fc | 6166 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6167 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6168 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6169 | (test_bit(Faulty, &rdev->flags) || |
6170 | ! test_bit(In_sync, &rdev->flags)) && | |
6171 | atomic_read(&rdev->nr_pending)==0) { | |
6172 | if (mddev->pers->hot_remove_disk( | |
6173 | mddev, rdev->raid_disk)==0) { | |
6174 | char nm[20]; | |
6175 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6176 | sysfs_remove_link(&mddev->kobj, nm); | |
6177 | rdev->raid_disk = -1; | |
6178 | } | |
6179 | } | |
6180 | ||
4044ba58 | 6181 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6182 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6183 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6184 | !test_bit(In_sync, &rdev->flags) && |
6185 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6186 | spares++; |
b4c4c7b8 N |
6187 | if (rdev->raid_disk < 0 |
6188 | && !test_bit(Faulty, &rdev->flags)) { | |
6189 | rdev->recovery_offset = 0; | |
199050ea NB |
6190 | if (mddev->pers-> |
6191 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6192 | char nm[20]; |
6193 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6194 | if (sysfs_create_link(&mddev->kobj, |
6195 | &rdev->kobj, nm)) | |
6196 | printk(KERN_WARNING | |
6197 | "md: cannot register " | |
6198 | "%s for %s\n", | |
6199 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6200 | spares++; |
6201 | md_new_event(mddev); | |
6202 | } else | |
6203 | break; | |
6204 | } | |
dfc70645 | 6205 | } |
b4c4c7b8 N |
6206 | } |
6207 | return spares; | |
6208 | } | |
1da177e4 LT |
6209 | /* |
6210 | * This routine is regularly called by all per-raid-array threads to | |
6211 | * deal with generic issues like resync and super-block update. | |
6212 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6213 | * need this as they never do any recovery or update the superblock. | |
6214 | * | |
6215 | * It does not do any resync itself, but rather "forks" off other threads | |
6216 | * to do that as needed. | |
6217 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6218 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6219 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6220 | * and wakeups up this thread which will reap the thread and finish up. |
6221 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6222 | * | |
6223 | * The overall approach is: | |
6224 | * 1/ if the superblock needs updating, update it. | |
6225 | * 2/ If a recovery thread is running, don't do anything else. | |
6226 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6227 | * 4/ If there are any faulty devices, remove them. | |
6228 | * 5/ If array is degraded, try to add spares devices | |
6229 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6230 | */ | |
6231 | void md_check_recovery(mddev_t *mddev) | |
6232 | { | |
6233 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6234 | |
6235 | ||
5f40402d N |
6236 | if (mddev->bitmap) |
6237 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
6238 | |
6239 | if (mddev->ro) | |
6240 | return; | |
fca4d848 N |
6241 | |
6242 | if (signal_pending(current)) { | |
31a59e34 | 6243 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6244 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6245 | mdname(mddev)); | |
6246 | mddev->safemode = 2; | |
6247 | } | |
6248 | flush_signals(current); | |
6249 | } | |
6250 | ||
c89a8eee N |
6251 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6252 | return; | |
1da177e4 | 6253 | if ( ! ( |
e691063a | 6254 | (mddev->flags && !mddev->external) || |
1da177e4 | 6255 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6256 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6257 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6258 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6259 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6260 | )) |
6261 | return; | |
fca4d848 | 6262 | |
df5b89b3 | 6263 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6264 | int spares = 0; |
fca4d848 | 6265 | |
c89a8eee N |
6266 | if (mddev->ro) { |
6267 | /* Only thing we do on a ro array is remove | |
6268 | * failed devices. | |
6269 | */ | |
6270 | remove_and_add_spares(mddev); | |
6271 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6272 | goto unlock; | |
6273 | } | |
6274 | ||
31a59e34 | 6275 | if (!mddev->external) { |
0fd62b86 | 6276 | int did_change = 0; |
31a59e34 N |
6277 | spin_lock_irq(&mddev->write_lock); |
6278 | if (mddev->safemode && | |
6279 | !atomic_read(&mddev->writes_pending) && | |
6280 | !mddev->in_sync && | |
6281 | mddev->recovery_cp == MaxSector) { | |
6282 | mddev->in_sync = 1; | |
0fd62b86 | 6283 | did_change = 1; |
31a59e34 N |
6284 | if (mddev->persistent) |
6285 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6286 | } | |
6287 | if (mddev->safemode == 1) | |
6288 | mddev->safemode = 0; | |
6289 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6290 | if (did_change) |
b62b7590 | 6291 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6292 | } |
fca4d848 | 6293 | |
850b2b42 N |
6294 | if (mddev->flags) |
6295 | md_update_sb(mddev, 0); | |
06d91a5f | 6296 | |
159ec1fc | 6297 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6298 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6299 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6300 | |
06d91a5f | 6301 | |
1da177e4 LT |
6302 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6303 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6304 | /* resync/recovery still happening */ | |
6305 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6306 | goto unlock; | |
6307 | } | |
6308 | if (mddev->sync_thread) { | |
6309 | /* resync has finished, collect result */ | |
6310 | md_unregister_thread(mddev->sync_thread); | |
6311 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6312 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6313 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6314 | /* success...*/ |
6315 | /* activate any spares */ | |
a99ac971 NB |
6316 | if (mddev->pers->spare_active(mddev)) |
6317 | sysfs_notify(&mddev->kobj, NULL, | |
6318 | "degraded"); | |
1da177e4 | 6319 | } |
850b2b42 | 6320 | md_update_sb(mddev, 1); |
41158c7e N |
6321 | |
6322 | /* if array is no-longer degraded, then any saved_raid_disk | |
6323 | * information must be scrapped | |
6324 | */ | |
6325 | if (!mddev->degraded) | |
159ec1fc | 6326 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6327 | rdev->saved_raid_disk = -1; |
6328 | ||
1da177e4 LT |
6329 | mddev->recovery = 0; |
6330 | /* flag recovery needed just to double check */ | |
6331 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6332 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6333 | md_new_event(mddev); |
1da177e4 LT |
6334 | goto unlock; |
6335 | } | |
72a23c21 NB |
6336 | /* Set RUNNING before clearing NEEDED to avoid |
6337 | * any transients in the value of "sync_action". | |
6338 | */ | |
6339 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6340 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6341 | /* Clear some bits that don't mean anything, but |
6342 | * might be left set | |
6343 | */ | |
24dd469d N |
6344 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6345 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6346 | |
5fd6c1dc N |
6347 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6348 | goto unlock; | |
1da177e4 LT |
6349 | /* no recovery is running. |
6350 | * remove any failed drives, then | |
6351 | * add spares if possible. | |
6352 | * Spare are also removed and re-added, to allow | |
6353 | * the personality to fail the re-add. | |
6354 | */ | |
1da177e4 | 6355 | |
b4c4c7b8 N |
6356 | if (mddev->reshape_position != MaxSector) { |
6357 | if (mddev->pers->check_reshape(mddev) != 0) | |
6358 | /* Cannot proceed */ | |
6359 | goto unlock; | |
6360 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6361 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6362 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6363 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6364 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6365 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6366 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6367 | } else if (mddev->recovery_cp < MaxSector) { |
6368 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6369 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6370 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6371 | /* nothing to be done ... */ | |
1da177e4 | 6372 | goto unlock; |
24dd469d | 6373 | |
1da177e4 | 6374 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6375 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6376 | /* We are adding a device or devices to an array | |
6377 | * which has the bitmap stored on all devices. | |
6378 | * So make sure all bitmap pages get written | |
6379 | */ | |
6380 | bitmap_write_all(mddev->bitmap); | |
6381 | } | |
1da177e4 LT |
6382 | mddev->sync_thread = md_register_thread(md_do_sync, |
6383 | mddev, | |
6384 | "%s_resync"); | |
6385 | if (!mddev->sync_thread) { | |
6386 | printk(KERN_ERR "%s: could not start resync" | |
6387 | " thread...\n", | |
6388 | mdname(mddev)); | |
6389 | /* leave the spares where they are, it shouldn't hurt */ | |
6390 | mddev->recovery = 0; | |
d7603b7e | 6391 | } else |
1da177e4 | 6392 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6393 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6394 | md_new_event(mddev); |
1da177e4 LT |
6395 | } |
6396 | unlock: | |
72a23c21 NB |
6397 | if (!mddev->sync_thread) { |
6398 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6399 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6400 | &mddev->recovery)) | |
0c3573f1 N |
6401 | if (mddev->sysfs_action) |
6402 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6403 | } |
1da177e4 LT |
6404 | mddev_unlock(mddev); |
6405 | } | |
6406 | } | |
6407 | ||
6bfe0b49 DW |
6408 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6409 | { | |
3c0ee63a | 6410 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
6411 | wait_event_timeout(rdev->blocked_wait, |
6412 | !test_bit(Blocked, &rdev->flags), | |
6413 | msecs_to_jiffies(5000)); | |
6414 | rdev_dec_pending(rdev, mddev); | |
6415 | } | |
6416 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6417 | ||
75c96f85 AB |
6418 | static int md_notify_reboot(struct notifier_block *this, |
6419 | unsigned long code, void *x) | |
1da177e4 LT |
6420 | { |
6421 | struct list_head *tmp; | |
6422 | mddev_t *mddev; | |
6423 | ||
6424 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6425 | ||
6426 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6427 | ||
29ac4aa3 | 6428 | for_each_mddev(mddev, tmp) |
c71d4887 | 6429 | if (mddev_trylock(mddev)) { |
2b25000b N |
6430 | /* Force a switch to readonly even array |
6431 | * appears to still be in use. Hence | |
6432 | * the '100'. | |
6433 | */ | |
d710e138 | 6434 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
6435 | mddev_unlock(mddev); |
6436 | } | |
1da177e4 LT |
6437 | /* |
6438 | * certain more exotic SCSI devices are known to be | |
6439 | * volatile wrt too early system reboots. While the | |
6440 | * right place to handle this issue is the given | |
6441 | * driver, we do want to have a safe RAID driver ... | |
6442 | */ | |
6443 | mdelay(1000*1); | |
6444 | } | |
6445 | return NOTIFY_DONE; | |
6446 | } | |
6447 | ||
75c96f85 | 6448 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6449 | .notifier_call = md_notify_reboot, |
6450 | .next = NULL, | |
6451 | .priority = INT_MAX, /* before any real devices */ | |
6452 | }; | |
6453 | ||
6454 | static void md_geninit(void) | |
6455 | { | |
1da177e4 LT |
6456 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6457 | ||
c7705f34 | 6458 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6459 | } |
6460 | ||
75c96f85 | 6461 | static int __init md_init(void) |
1da177e4 | 6462 | { |
1da177e4 LT |
6463 | if (register_blkdev(MAJOR_NR, "md")) |
6464 | return -1; | |
6465 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
6466 | unregister_blkdev(MAJOR_NR, "md"); | |
6467 | return -1; | |
6468 | } | |
e8703fe1 N |
6469 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
6470 | md_probe, NULL, NULL); | |
6471 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6472 | md_probe, NULL, NULL); |
6473 | ||
1da177e4 | 6474 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6475 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6476 | |
6477 | md_geninit(); | |
d710e138 | 6478 | return 0; |
1da177e4 LT |
6479 | } |
6480 | ||
6481 | ||
6482 | #ifndef MODULE | |
6483 | ||
6484 | /* | |
6485 | * Searches all registered partitions for autorun RAID arrays | |
6486 | * at boot time. | |
6487 | */ | |
4d936ec1 ME |
6488 | |
6489 | static LIST_HEAD(all_detected_devices); | |
6490 | struct detected_devices_node { | |
6491 | struct list_head list; | |
6492 | dev_t dev; | |
6493 | }; | |
1da177e4 LT |
6494 | |
6495 | void md_autodetect_dev(dev_t dev) | |
6496 | { | |
4d936ec1 ME |
6497 | struct detected_devices_node *node_detected_dev; |
6498 | ||
6499 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6500 | if (node_detected_dev) { | |
6501 | node_detected_dev->dev = dev; | |
6502 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6503 | } else { | |
6504 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6505 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6506 | } | |
1da177e4 LT |
6507 | } |
6508 | ||
6509 | ||
6510 | static void autostart_arrays(int part) | |
6511 | { | |
6512 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6513 | struct detected_devices_node *node_detected_dev; |
6514 | dev_t dev; | |
6515 | int i_scanned, i_passed; | |
1da177e4 | 6516 | |
4d936ec1 ME |
6517 | i_scanned = 0; |
6518 | i_passed = 0; | |
1da177e4 | 6519 | |
4d936ec1 | 6520 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6521 | |
4d936ec1 ME |
6522 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6523 | i_scanned++; | |
6524 | node_detected_dev = list_entry(all_detected_devices.next, | |
6525 | struct detected_devices_node, list); | |
6526 | list_del(&node_detected_dev->list); | |
6527 | dev = node_detected_dev->dev; | |
6528 | kfree(node_detected_dev); | |
df968c4e | 6529 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6530 | if (IS_ERR(rdev)) |
6531 | continue; | |
6532 | ||
b2d444d7 | 6533 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6534 | MD_BUG(); |
6535 | continue; | |
6536 | } | |
d0fae18f | 6537 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6538 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6539 | i_passed++; |
1da177e4 | 6540 | } |
4d936ec1 ME |
6541 | |
6542 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6543 | i_scanned, i_passed); | |
1da177e4 LT |
6544 | |
6545 | autorun_devices(part); | |
6546 | } | |
6547 | ||
fdee8ae4 | 6548 | #endif /* !MODULE */ |
1da177e4 LT |
6549 | |
6550 | static __exit void md_exit(void) | |
6551 | { | |
6552 | mddev_t *mddev; | |
6553 | struct list_head *tmp; | |
8ab5e4c1 | 6554 | |
e8703fe1 N |
6555 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
6556 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
6557 | |
6558 | unregister_blkdev(MAJOR_NR,"md"); | |
6559 | unregister_blkdev(mdp_major, "mdp"); | |
6560 | unregister_reboot_notifier(&md_notifier); | |
6561 | unregister_sysctl_table(raid_table_header); | |
6562 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6563 | for_each_mddev(mddev, tmp) { |
1da177e4 | 6564 | export_array(mddev); |
d3374825 | 6565 | mddev->hold_active = 0; |
1da177e4 LT |
6566 | } |
6567 | } | |
6568 | ||
685784aa | 6569 | subsys_initcall(md_init); |
1da177e4 LT |
6570 | module_exit(md_exit) |
6571 | ||
f91de92e N |
6572 | static int get_ro(char *buffer, struct kernel_param *kp) |
6573 | { | |
6574 | return sprintf(buffer, "%d", start_readonly); | |
6575 | } | |
6576 | static int set_ro(const char *val, struct kernel_param *kp) | |
6577 | { | |
6578 | char *e; | |
6579 | int num = simple_strtoul(val, &e, 10); | |
6580 | if (*val && (*e == '\0' || *e == '\n')) { | |
6581 | start_readonly = num; | |
4dbcdc75 | 6582 | return 0; |
f91de92e N |
6583 | } |
6584 | return -EINVAL; | |
6585 | } | |
6586 | ||
80ca3a44 N |
6587 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6588 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6589 | |
efeb53c0 | 6590 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 6591 | |
1da177e4 LT |
6592 | EXPORT_SYMBOL(register_md_personality); |
6593 | EXPORT_SYMBOL(unregister_md_personality); | |
6594 | EXPORT_SYMBOL(md_error); | |
6595 | EXPORT_SYMBOL(md_done_sync); | |
6596 | EXPORT_SYMBOL(md_write_start); | |
6597 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6598 | EXPORT_SYMBOL(md_register_thread); |
6599 | EXPORT_SYMBOL(md_unregister_thread); | |
6600 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6601 | EXPORT_SYMBOL(md_check_recovery); |
6602 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6603 | MODULE_ALIAS("md"); |
72008652 | 6604 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |