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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
1da177e4 LT |
36 | #include <linux/raid/md.h> |
37 | #include <linux/sysctl.h> | |
1da177e4 | 38 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 39 | #include <linux/poll.h> |
16f17b39 | 40 | #include <linux/ctype.h> |
fb4d8c76 N |
41 | #include <linux/hdreg.h> |
42 | #include <linux/proc_fs.h> | |
43 | #include <linux/random.h> | |
44 | #include <linux/reboot.h> | |
32a7627c | 45 | #include <linux/file.h> |
25570727 | 46 | #include <linux/delay.h> |
ef740c37 | 47 | #include "bitmap.h" |
32a7627c | 48 | |
1da177e4 LT |
49 | #define DEBUG 0 |
50 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
51 | ||
52 | ||
53 | #ifndef MODULE | |
d710e138 | 54 | static void autostart_arrays(int part); |
1da177e4 LT |
55 | #endif |
56 | ||
2604b703 | 57 | static LIST_HEAD(pers_list); |
1da177e4 LT |
58 | static DEFINE_SPINLOCK(pers_lock); |
59 | ||
5e56341d AB |
60 | static void md_print_devices(void); |
61 | ||
90b08710 BS |
62 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
63 | ||
5e56341d AB |
64 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
65 | ||
1da177e4 LT |
66 | /* |
67 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
68 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
69 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 70 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
71 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
72 | * speed limit - in case reconstruction slows down your system despite | |
73 | * idle IO detection. | |
74 | * | |
75 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 76 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
77 | */ |
78 | ||
79 | static int sysctl_speed_limit_min = 1000; | |
80 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
81 | static inline int speed_min(mddev_t *mddev) |
82 | { | |
83 | return mddev->sync_speed_min ? | |
84 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
85 | } | |
86 | ||
87 | static inline int speed_max(mddev_t *mddev) | |
88 | { | |
89 | return mddev->sync_speed_max ? | |
90 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
91 | } | |
1da177e4 LT |
92 | |
93 | static struct ctl_table_header *raid_table_header; | |
94 | ||
95 | static ctl_table raid_table[] = { | |
96 | { | |
97 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
98 | .procname = "speed_limit_min", | |
99 | .data = &sysctl_speed_limit_min, | |
100 | .maxlen = sizeof(int), | |
80ca3a44 | 101 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
102 | .proc_handler = &proc_dointvec, |
103 | }, | |
104 | { | |
105 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
106 | .procname = "speed_limit_max", | |
107 | .data = &sysctl_speed_limit_max, | |
108 | .maxlen = sizeof(int), | |
80ca3a44 | 109 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
110 | .proc_handler = &proc_dointvec, |
111 | }, | |
112 | { .ctl_name = 0 } | |
113 | }; | |
114 | ||
115 | static ctl_table raid_dir_table[] = { | |
116 | { | |
117 | .ctl_name = DEV_RAID, | |
118 | .procname = "raid", | |
119 | .maxlen = 0, | |
80ca3a44 | 120 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
121 | .child = raid_table, |
122 | }, | |
123 | { .ctl_name = 0 } | |
124 | }; | |
125 | ||
126 | static ctl_table raid_root_table[] = { | |
127 | { | |
128 | .ctl_name = CTL_DEV, | |
129 | .procname = "dev", | |
130 | .maxlen = 0, | |
131 | .mode = 0555, | |
132 | .child = raid_dir_table, | |
133 | }, | |
134 | { .ctl_name = 0 } | |
135 | }; | |
136 | ||
137 | static struct block_device_operations md_fops; | |
138 | ||
f91de92e N |
139 | static int start_readonly; |
140 | ||
d7603b7e N |
141 | /* |
142 | * We have a system wide 'event count' that is incremented | |
143 | * on any 'interesting' event, and readers of /proc/mdstat | |
144 | * can use 'poll' or 'select' to find out when the event | |
145 | * count increases. | |
146 | * | |
147 | * Events are: | |
148 | * start array, stop array, error, add device, remove device, | |
149 | * start build, activate spare | |
150 | */ | |
2989ddbd | 151 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 152 | static atomic_t md_event_count; |
29269553 | 153 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
154 | { |
155 | atomic_inc(&md_event_count); | |
156 | wake_up(&md_event_waiters); | |
157 | } | |
29269553 | 158 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 159 | |
c331eb04 N |
160 | /* Alternate version that can be called from interrupts |
161 | * when calling sysfs_notify isn't needed. | |
162 | */ | |
05381954 | 163 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
164 | { |
165 | atomic_inc(&md_event_count); | |
166 | wake_up(&md_event_waiters); | |
167 | } | |
168 | ||
1da177e4 LT |
169 | /* |
170 | * Enables to iterate over all existing md arrays | |
171 | * all_mddevs_lock protects this list. | |
172 | */ | |
173 | static LIST_HEAD(all_mddevs); | |
174 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
175 | ||
176 | ||
177 | /* | |
178 | * iterates through all used mddevs in the system. | |
179 | * We take care to grab the all_mddevs_lock whenever navigating | |
180 | * the list, and to always hold a refcount when unlocked. | |
181 | * Any code which breaks out of this loop while own | |
182 | * a reference to the current mddev and must mddev_put it. | |
183 | */ | |
29ac4aa3 | 184 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
185 | \ |
186 | for (({ spin_lock(&all_mddevs_lock); \ | |
187 | tmp = all_mddevs.next; \ | |
188 | mddev = NULL;}); \ | |
189 | ({ if (tmp != &all_mddevs) \ | |
190 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
191 | spin_unlock(&all_mddevs_lock); \ | |
192 | if (mddev) mddev_put(mddev); \ | |
193 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
194 | tmp != &all_mddevs;}); \ | |
195 | ({ spin_lock(&all_mddevs_lock); \ | |
196 | tmp = tmp->next;}) \ | |
197 | ) | |
198 | ||
199 | ||
d710e138 | 200 | static int md_fail_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 201 | { |
6712ecf8 | 202 | bio_io_error(bio); |
1da177e4 LT |
203 | return 0; |
204 | } | |
205 | ||
206 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
207 | { | |
208 | atomic_inc(&mddev->active); | |
209 | return mddev; | |
210 | } | |
211 | ||
d3374825 N |
212 | static void mddev_delayed_delete(struct work_struct *ws) |
213 | { | |
214 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
215 | kobject_del(&mddev->kobj); | |
216 | kobject_put(&mddev->kobj); | |
217 | } | |
218 | ||
1da177e4 LT |
219 | static void mddev_put(mddev_t *mddev) |
220 | { | |
221 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
222 | return; | |
d3374825 N |
223 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
224 | !mddev->hold_active) { | |
1da177e4 | 225 | list_del(&mddev->all_mddevs); |
d3374825 N |
226 | if (mddev->gendisk) { |
227 | /* we did a probe so need to clean up. | |
228 | * Call schedule_work inside the spinlock | |
229 | * so that flush_scheduled_work() after | |
230 | * mddev_find will succeed in waiting for the | |
231 | * work to be done. | |
232 | */ | |
233 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
234 | schedule_work(&mddev->del_work); | |
235 | } else | |
236 | kfree(mddev); | |
237 | } | |
238 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
239 | } |
240 | ||
241 | static mddev_t * mddev_find(dev_t unit) | |
242 | { | |
243 | mddev_t *mddev, *new = NULL; | |
244 | ||
245 | retry: | |
246 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
247 | |
248 | if (unit) { | |
249 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
250 | if (mddev->unit == unit) { | |
251 | mddev_get(mddev); | |
252 | spin_unlock(&all_mddevs_lock); | |
253 | kfree(new); | |
254 | return mddev; | |
255 | } | |
256 | ||
257 | if (new) { | |
258 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 259 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
260 | new->hold_active = UNTIL_IOCTL; |
261 | return new; | |
1da177e4 | 262 | } |
efeb53c0 N |
263 | } else if (new) { |
264 | /* find an unused unit number */ | |
265 | static int next_minor = 512; | |
266 | int start = next_minor; | |
267 | int is_free = 0; | |
268 | int dev = 0; | |
269 | while (!is_free) { | |
270 | dev = MKDEV(MD_MAJOR, next_minor); | |
271 | next_minor++; | |
272 | if (next_minor > MINORMASK) | |
273 | next_minor = 0; | |
274 | if (next_minor == start) { | |
275 | /* Oh dear, all in use. */ | |
276 | spin_unlock(&all_mddevs_lock); | |
277 | kfree(new); | |
278 | return NULL; | |
279 | } | |
280 | ||
281 | is_free = 1; | |
282 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
283 | if (mddev->unit == dev) { | |
284 | is_free = 0; | |
285 | break; | |
286 | } | |
287 | } | |
288 | new->unit = dev; | |
289 | new->md_minor = MINOR(dev); | |
290 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
291 | list_add(&new->all_mddevs, &all_mddevs); |
292 | spin_unlock(&all_mddevs_lock); | |
293 | return new; | |
294 | } | |
295 | spin_unlock(&all_mddevs_lock); | |
296 | ||
9ffae0cf | 297 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
298 | if (!new) |
299 | return NULL; | |
300 | ||
1da177e4 LT |
301 | new->unit = unit; |
302 | if (MAJOR(unit) == MD_MAJOR) | |
303 | new->md_minor = MINOR(unit); | |
304 | else | |
305 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
306 | ||
df5b89b3 | 307 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
308 | INIT_LIST_HEAD(&new->disks); |
309 | INIT_LIST_HEAD(&new->all_mddevs); | |
310 | init_timer(&new->safemode_timer); | |
311 | atomic_set(&new->active, 1); | |
f2ea68cf | 312 | atomic_set(&new->openers, 0); |
06d91a5f | 313 | spin_lock_init(&new->write_lock); |
3d310eb7 | 314 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 315 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 316 | new->reshape_position = MaxSector; |
5e96ee65 | 317 | new->resync_min = 0; |
c6207277 | 318 | new->resync_max = MaxSector; |
d897dbf9 | 319 | new->level = LEVEL_NONE; |
1da177e4 | 320 | |
1da177e4 LT |
321 | goto retry; |
322 | } | |
323 | ||
324 | static inline int mddev_lock(mddev_t * mddev) | |
325 | { | |
df5b89b3 | 326 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
327 | } |
328 | ||
1da177e4 LT |
329 | static inline int mddev_trylock(mddev_t * mddev) |
330 | { | |
df5b89b3 | 331 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
332 | } |
333 | ||
334 | static inline void mddev_unlock(mddev_t * mddev) | |
335 | { | |
df5b89b3 | 336 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 337 | |
005eca5e | 338 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
339 | } |
340 | ||
2989ddbd | 341 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 342 | { |
159ec1fc | 343 | mdk_rdev_t *rdev; |
1da177e4 | 344 | |
159ec1fc | 345 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
346 | if (rdev->desc_nr == nr) |
347 | return rdev; | |
159ec1fc | 348 | |
1da177e4 LT |
349 | return NULL; |
350 | } | |
351 | ||
352 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
353 | { | |
1da177e4 LT |
354 | mdk_rdev_t *rdev; |
355 | ||
159ec1fc | 356 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
357 | if (rdev->bdev->bd_dev == dev) |
358 | return rdev; | |
159ec1fc | 359 | |
1da177e4 LT |
360 | return NULL; |
361 | } | |
362 | ||
d9d166c2 | 363 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
364 | { |
365 | struct mdk_personality *pers; | |
d9d166c2 N |
366 | list_for_each_entry(pers, &pers_list, list) { |
367 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 368 | return pers; |
d9d166c2 N |
369 | if (strcmp(pers->name, clevel)==0) |
370 | return pers; | |
371 | } | |
2604b703 N |
372 | return NULL; |
373 | } | |
374 | ||
b73df2d3 | 375 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 376 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 377 | { |
b73df2d3 AN |
378 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
379 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
380 | } |
381 | ||
e7debaa4 | 382 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 383 | { |
0f420358 | 384 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
385 | |
386 | if (chunk_size) | |
e7debaa4 AN |
387 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
388 | return num_sectors; | |
1da177e4 LT |
389 | } |
390 | ||
391 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
392 | { | |
393 | if (rdev->sb_page) | |
394 | MD_BUG(); | |
395 | ||
396 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
397 | if (!rdev->sb_page) { | |
398 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 399 | return -ENOMEM; |
1da177e4 LT |
400 | } |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | static void free_disk_sb(mdk_rdev_t * rdev) | |
406 | { | |
407 | if (rdev->sb_page) { | |
2d1f3b5d | 408 | put_page(rdev->sb_page); |
1da177e4 LT |
409 | rdev->sb_loaded = 0; |
410 | rdev->sb_page = NULL; | |
0f420358 | 411 | rdev->sb_start = 0; |
1da177e4 LT |
412 | rdev->size = 0; |
413 | } | |
414 | } | |
415 | ||
416 | ||
6712ecf8 | 417 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
418 | { |
419 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 420 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 421 | |
3a0f5bbb N |
422 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
423 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
424 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
425 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 426 | md_error(mddev, rdev); |
3a0f5bbb | 427 | } |
7bfa19f2 | 428 | |
a9701a30 N |
429 | if (atomic_dec_and_test(&mddev->pending_writes)) |
430 | wake_up(&mddev->sb_wait); | |
f8b58edf | 431 | bio_put(bio); |
7bfa19f2 N |
432 | } |
433 | ||
6712ecf8 | 434 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
435 | { |
436 | struct bio *bio2 = bio->bi_private; | |
437 | mdk_rdev_t *rdev = bio2->bi_private; | |
438 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
439 | |
440 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
441 | error == -EOPNOTSUPP) { | |
442 | unsigned long flags; | |
443 | /* barriers don't appear to be supported :-( */ | |
444 | set_bit(BarriersNotsupp, &rdev->flags); | |
445 | mddev->barriers_work = 0; | |
446 | spin_lock_irqsave(&mddev->write_lock, flags); | |
447 | bio2->bi_next = mddev->biolist; | |
448 | mddev->biolist = bio2; | |
449 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
450 | wake_up(&mddev->sb_wait); | |
451 | bio_put(bio); | |
6712ecf8 N |
452 | } else { |
453 | bio_put(bio2); | |
454 | bio->bi_private = rdev; | |
455 | super_written(bio, error); | |
a9701a30 | 456 | } |
a9701a30 N |
457 | } |
458 | ||
7bfa19f2 N |
459 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
460 | sector_t sector, int size, struct page *page) | |
461 | { | |
462 | /* write first size bytes of page to sector of rdev | |
463 | * Increment mddev->pending_writes before returning | |
464 | * and decrement it on completion, waking up sb_wait | |
465 | * if zero is reached. | |
466 | * If an error occurred, call md_error | |
a9701a30 N |
467 | * |
468 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
469 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
470 | */ |
471 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
93dbb393 | 472 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); |
7bfa19f2 N |
473 | |
474 | bio->bi_bdev = rdev->bdev; | |
475 | bio->bi_sector = sector; | |
476 | bio_add_page(bio, page, size, 0); | |
477 | bio->bi_private = rdev; | |
478 | bio->bi_end_io = super_written; | |
a9701a30 N |
479 | bio->bi_rw = rw; |
480 | ||
7bfa19f2 | 481 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
482 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
483 | struct bio *rbio; | |
484 | rw |= (1<<BIO_RW_BARRIER); | |
485 | rbio = bio_clone(bio, GFP_NOIO); | |
486 | rbio->bi_private = bio; | |
487 | rbio->bi_end_io = super_written_barrier; | |
488 | submit_bio(rw, rbio); | |
489 | } else | |
490 | submit_bio(rw, bio); | |
491 | } | |
492 | ||
493 | void md_super_wait(mddev_t *mddev) | |
494 | { | |
495 | /* wait for all superblock writes that were scheduled to complete. | |
496 | * if any had to be retried (due to BARRIER problems), retry them | |
497 | */ | |
498 | DEFINE_WAIT(wq); | |
499 | for(;;) { | |
500 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
501 | if (atomic_read(&mddev->pending_writes)==0) | |
502 | break; | |
503 | while (mddev->biolist) { | |
504 | struct bio *bio; | |
505 | spin_lock_irq(&mddev->write_lock); | |
506 | bio = mddev->biolist; | |
507 | mddev->biolist = bio->bi_next ; | |
508 | bio->bi_next = NULL; | |
509 | spin_unlock_irq(&mddev->write_lock); | |
510 | submit_bio(bio->bi_rw, bio); | |
511 | } | |
512 | schedule(); | |
513 | } | |
514 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
515 | } |
516 | ||
6712ecf8 | 517 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 518 | { |
1da177e4 | 519 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
520 | } |
521 | ||
a654b9d8 | 522 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
523 | struct page *page, int rw) |
524 | { | |
baaa2c51 | 525 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
526 | struct completion event; |
527 | int ret; | |
528 | ||
93dbb393 | 529 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
1da177e4 LT |
530 | |
531 | bio->bi_bdev = bdev; | |
532 | bio->bi_sector = sector; | |
533 | bio_add_page(bio, page, size, 0); | |
534 | init_completion(&event); | |
535 | bio->bi_private = &event; | |
536 | bio->bi_end_io = bi_complete; | |
537 | submit_bio(rw, bio); | |
538 | wait_for_completion(&event); | |
539 | ||
540 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
541 | bio_put(bio); | |
542 | return ret; | |
543 | } | |
a8745db2 | 544 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 545 | |
0002b271 | 546 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
547 | { |
548 | char b[BDEVNAME_SIZE]; | |
549 | if (!rdev->sb_page) { | |
550 | MD_BUG(); | |
551 | return -EINVAL; | |
552 | } | |
553 | if (rdev->sb_loaded) | |
554 | return 0; | |
555 | ||
556 | ||
0f420358 | 557 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
558 | goto fail; |
559 | rdev->sb_loaded = 1; | |
560 | return 0; | |
561 | ||
562 | fail: | |
563 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
564 | bdevname(rdev->bdev,b)); | |
565 | return -EINVAL; | |
566 | } | |
567 | ||
568 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
569 | { | |
05710466 AN |
570 | return sb1->set_uuid0 == sb2->set_uuid0 && |
571 | sb1->set_uuid1 == sb2->set_uuid1 && | |
572 | sb1->set_uuid2 == sb2->set_uuid2 && | |
573 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
574 | } |
575 | ||
1da177e4 LT |
576 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
577 | { | |
578 | int ret; | |
579 | mdp_super_t *tmp1, *tmp2; | |
580 | ||
581 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
582 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
583 | ||
584 | if (!tmp1 || !tmp2) { | |
585 | ret = 0; | |
35020f1a | 586 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
587 | goto abort; |
588 | } | |
589 | ||
590 | *tmp1 = *sb1; | |
591 | *tmp2 = *sb2; | |
592 | ||
593 | /* | |
594 | * nr_disks is not constant | |
595 | */ | |
596 | tmp1->nr_disks = 0; | |
597 | tmp2->nr_disks = 0; | |
598 | ||
ce0c8e05 | 599 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 600 | abort: |
990a8baf JJ |
601 | kfree(tmp1); |
602 | kfree(tmp2); | |
1da177e4 LT |
603 | return ret; |
604 | } | |
605 | ||
4d167f09 N |
606 | |
607 | static u32 md_csum_fold(u32 csum) | |
608 | { | |
609 | csum = (csum & 0xffff) + (csum >> 16); | |
610 | return (csum & 0xffff) + (csum >> 16); | |
611 | } | |
612 | ||
1da177e4 LT |
613 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
614 | { | |
4d167f09 N |
615 | u64 newcsum = 0; |
616 | u32 *sb32 = (u32*)sb; | |
617 | int i; | |
1da177e4 LT |
618 | unsigned int disk_csum, csum; |
619 | ||
620 | disk_csum = sb->sb_csum; | |
621 | sb->sb_csum = 0; | |
4d167f09 N |
622 | |
623 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
624 | newcsum += sb32[i]; | |
625 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
626 | ||
627 | ||
628 | #ifdef CONFIG_ALPHA | |
629 | /* This used to use csum_partial, which was wrong for several | |
630 | * reasons including that different results are returned on | |
631 | * different architectures. It isn't critical that we get exactly | |
632 | * the same return value as before (we always csum_fold before | |
633 | * testing, and that removes any differences). However as we | |
634 | * know that csum_partial always returned a 16bit value on | |
635 | * alphas, do a fold to maximise conformity to previous behaviour. | |
636 | */ | |
637 | sb->sb_csum = md_csum_fold(disk_csum); | |
638 | #else | |
1da177e4 | 639 | sb->sb_csum = disk_csum; |
4d167f09 | 640 | #endif |
1da177e4 LT |
641 | return csum; |
642 | } | |
643 | ||
644 | ||
645 | /* | |
646 | * Handle superblock details. | |
647 | * We want to be able to handle multiple superblock formats | |
648 | * so we have a common interface to them all, and an array of | |
649 | * different handlers. | |
650 | * We rely on user-space to write the initial superblock, and support | |
651 | * reading and updating of superblocks. | |
652 | * Interface methods are: | |
653 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
654 | * loads and validates a superblock on dev. | |
655 | * if refdev != NULL, compare superblocks on both devices | |
656 | * Return: | |
657 | * 0 - dev has a superblock that is compatible with refdev | |
658 | * 1 - dev has a superblock that is compatible and newer than refdev | |
659 | * so dev should be used as the refdev in future | |
660 | * -EINVAL superblock incompatible or invalid | |
661 | * -othererror e.g. -EIO | |
662 | * | |
663 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
664 | * Verify that dev is acceptable into mddev. | |
665 | * The first time, mddev->raid_disks will be 0, and data from | |
666 | * dev should be merged in. Subsequent calls check that dev | |
667 | * is new enough. Return 0 or -EINVAL | |
668 | * | |
669 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
670 | * Update the superblock for rdev with data in mddev | |
671 | * This does not write to disc. | |
672 | * | |
673 | */ | |
674 | ||
675 | struct super_type { | |
0cd17fec CW |
676 | char *name; |
677 | struct module *owner; | |
678 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
679 | int minor_version); | |
680 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
681 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
682 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 683 | sector_t num_sectors); |
1da177e4 LT |
684 | }; |
685 | ||
686 | /* | |
687 | * load_super for 0.90.0 | |
688 | */ | |
689 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
690 | { | |
691 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
692 | mdp_super_t *sb; | |
693 | int ret; | |
1da177e4 LT |
694 | |
695 | /* | |
0f420358 | 696 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
697 | * it's at the end of the disk. |
698 | * | |
699 | * It also happens to be a multiple of 4Kb. | |
700 | */ | |
0f420358 | 701 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 702 | |
0002b271 | 703 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
704 | if (ret) return ret; |
705 | ||
706 | ret = -EINVAL; | |
707 | ||
708 | bdevname(rdev->bdev, b); | |
709 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
710 | ||
711 | if (sb->md_magic != MD_SB_MAGIC) { | |
712 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
713 | b); | |
714 | goto abort; | |
715 | } | |
716 | ||
717 | if (sb->major_version != 0 || | |
f6705578 N |
718 | sb->minor_version < 90 || |
719 | sb->minor_version > 91) { | |
1da177e4 LT |
720 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
721 | sb->major_version, sb->minor_version, | |
722 | b); | |
723 | goto abort; | |
724 | } | |
725 | ||
726 | if (sb->raid_disks <= 0) | |
727 | goto abort; | |
728 | ||
4d167f09 | 729 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
730 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
731 | b); | |
732 | goto abort; | |
733 | } | |
734 | ||
735 | rdev->preferred_minor = sb->md_minor; | |
736 | rdev->data_offset = 0; | |
0002b271 | 737 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 738 | |
e11e93fa N |
739 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
740 | if (sb->level != 1 && sb->level != 4 | |
741 | && sb->level != 5 && sb->level != 6 | |
742 | && sb->level != 10) { | |
743 | /* FIXME use a better test */ | |
744 | printk(KERN_WARNING | |
745 | "md: bitmaps not supported for this level.\n"); | |
746 | goto abort; | |
747 | } | |
748 | } | |
749 | ||
1da177e4 LT |
750 | if (sb->level == LEVEL_MULTIPATH) |
751 | rdev->desc_nr = -1; | |
752 | else | |
753 | rdev->desc_nr = sb->this_disk.number; | |
754 | ||
9a7b2b0f | 755 | if (!refdev) { |
1da177e4 | 756 | ret = 1; |
9a7b2b0f | 757 | } else { |
1da177e4 LT |
758 | __u64 ev1, ev2; |
759 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
760 | if (!uuid_equal(refsb, sb)) { | |
761 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
762 | b, bdevname(refdev->bdev,b2)); | |
763 | goto abort; | |
764 | } | |
765 | if (!sb_equal(refsb, sb)) { | |
766 | printk(KERN_WARNING "md: %s has same UUID" | |
767 | " but different superblock to %s\n", | |
768 | b, bdevname(refdev->bdev, b2)); | |
769 | goto abort; | |
770 | } | |
771 | ev1 = md_event(sb); | |
772 | ev2 = md_event(refsb); | |
773 | if (ev1 > ev2) | |
774 | ret = 1; | |
775 | else | |
776 | ret = 0; | |
777 | } | |
e7debaa4 | 778 | rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2; |
1da177e4 | 779 | |
2bf071bf N |
780 | if (rdev->size < sb->size && sb->level > 1) |
781 | /* "this cannot possibly happen" ... */ | |
782 | ret = -EINVAL; | |
783 | ||
1da177e4 LT |
784 | abort: |
785 | return ret; | |
786 | } | |
787 | ||
788 | /* | |
789 | * validate_super for 0.90.0 | |
790 | */ | |
791 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
792 | { | |
793 | mdp_disk_t *desc; | |
794 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 795 | __u64 ev1 = md_event(sb); |
1da177e4 | 796 | |
41158c7e | 797 | rdev->raid_disk = -1; |
c5d79adb N |
798 | clear_bit(Faulty, &rdev->flags); |
799 | clear_bit(In_sync, &rdev->flags); | |
800 | clear_bit(WriteMostly, &rdev->flags); | |
801 | clear_bit(BarriersNotsupp, &rdev->flags); | |
802 | ||
1da177e4 LT |
803 | if (mddev->raid_disks == 0) { |
804 | mddev->major_version = 0; | |
805 | mddev->minor_version = sb->minor_version; | |
806 | mddev->patch_version = sb->patch_version; | |
e691063a | 807 | mddev->external = 0; |
1da177e4 LT |
808 | mddev->chunk_size = sb->chunk_size; |
809 | mddev->ctime = sb->ctime; | |
810 | mddev->utime = sb->utime; | |
811 | mddev->level = sb->level; | |
d9d166c2 | 812 | mddev->clevel[0] = 0; |
1da177e4 LT |
813 | mddev->layout = sb->layout; |
814 | mddev->raid_disks = sb->raid_disks; | |
815 | mddev->size = sb->size; | |
07d84d10 | 816 | mddev->events = ev1; |
9223214e | 817 | mddev->bitmap_offset = 0; |
36fa3063 | 818 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 819 | |
f6705578 N |
820 | if (mddev->minor_version >= 91) { |
821 | mddev->reshape_position = sb->reshape_position; | |
822 | mddev->delta_disks = sb->delta_disks; | |
823 | mddev->new_level = sb->new_level; | |
824 | mddev->new_layout = sb->new_layout; | |
825 | mddev->new_chunk = sb->new_chunk; | |
826 | } else { | |
827 | mddev->reshape_position = MaxSector; | |
828 | mddev->delta_disks = 0; | |
829 | mddev->new_level = mddev->level; | |
830 | mddev->new_layout = mddev->layout; | |
831 | mddev->new_chunk = mddev->chunk_size; | |
832 | } | |
833 | ||
1da177e4 LT |
834 | if (sb->state & (1<<MD_SB_CLEAN)) |
835 | mddev->recovery_cp = MaxSector; | |
836 | else { | |
837 | if (sb->events_hi == sb->cp_events_hi && | |
838 | sb->events_lo == sb->cp_events_lo) { | |
839 | mddev->recovery_cp = sb->recovery_cp; | |
840 | } else | |
841 | mddev->recovery_cp = 0; | |
842 | } | |
843 | ||
844 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
845 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
846 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
847 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
848 | ||
849 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
850 | |
851 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 852 | mddev->bitmap_file == NULL) |
36fa3063 | 853 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 854 | |
41158c7e N |
855 | } else if (mddev->pers == NULL) { |
856 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
857 | ++ev1; |
858 | if (ev1 < mddev->events) | |
859 | return -EINVAL; | |
41158c7e N |
860 | } else if (mddev->bitmap) { |
861 | /* if adding to array with a bitmap, then we can accept an | |
862 | * older device ... but not too old. | |
863 | */ | |
41158c7e N |
864 | if (ev1 < mddev->bitmap->events_cleared) |
865 | return 0; | |
07d84d10 N |
866 | } else { |
867 | if (ev1 < mddev->events) | |
868 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
869 | return 0; | |
870 | } | |
41158c7e | 871 | |
1da177e4 | 872 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
873 | desc = sb->disks + rdev->desc_nr; |
874 | ||
875 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 876 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
877 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
878 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 879 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
880 | rdev->raid_disk = desc->raid_disk; |
881 | } | |
8ddf9efe N |
882 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
883 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 884 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 885 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
886 | return 0; |
887 | } | |
888 | ||
889 | /* | |
890 | * sync_super for 0.90.0 | |
891 | */ | |
892 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
893 | { | |
894 | mdp_super_t *sb; | |
1da177e4 LT |
895 | mdk_rdev_t *rdev2; |
896 | int next_spare = mddev->raid_disks; | |
19133a42 | 897 | |
1da177e4 LT |
898 | |
899 | /* make rdev->sb match mddev data.. | |
900 | * | |
901 | * 1/ zero out disks | |
902 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
903 | * 3/ any empty disks < next_spare become removed | |
904 | * | |
905 | * disks[0] gets initialised to REMOVED because | |
906 | * we cannot be sure from other fields if it has | |
907 | * been initialised or not. | |
908 | */ | |
909 | int i; | |
910 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
911 | ||
61181565 N |
912 | rdev->sb_size = MD_SB_BYTES; |
913 | ||
1da177e4 LT |
914 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
915 | ||
916 | memset(sb, 0, sizeof(*sb)); | |
917 | ||
918 | sb->md_magic = MD_SB_MAGIC; | |
919 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
920 | sb->patch_version = mddev->patch_version; |
921 | sb->gvalid_words = 0; /* ignored */ | |
922 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
923 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
924 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
925 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
926 | ||
927 | sb->ctime = mddev->ctime; | |
928 | sb->level = mddev->level; | |
929 | sb->size = mddev->size; | |
930 | sb->raid_disks = mddev->raid_disks; | |
931 | sb->md_minor = mddev->md_minor; | |
e691063a | 932 | sb->not_persistent = 0; |
1da177e4 LT |
933 | sb->utime = mddev->utime; |
934 | sb->state = 0; | |
935 | sb->events_hi = (mddev->events>>32); | |
936 | sb->events_lo = (u32)mddev->events; | |
937 | ||
f6705578 N |
938 | if (mddev->reshape_position == MaxSector) |
939 | sb->minor_version = 90; | |
940 | else { | |
941 | sb->minor_version = 91; | |
942 | sb->reshape_position = mddev->reshape_position; | |
943 | sb->new_level = mddev->new_level; | |
944 | sb->delta_disks = mddev->delta_disks; | |
945 | sb->new_layout = mddev->new_layout; | |
946 | sb->new_chunk = mddev->new_chunk; | |
947 | } | |
948 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
949 | if (mddev->in_sync) |
950 | { | |
951 | sb->recovery_cp = mddev->recovery_cp; | |
952 | sb->cp_events_hi = (mddev->events>>32); | |
953 | sb->cp_events_lo = (u32)mddev->events; | |
954 | if (mddev->recovery_cp == MaxSector) | |
955 | sb->state = (1<< MD_SB_CLEAN); | |
956 | } else | |
957 | sb->recovery_cp = 0; | |
958 | ||
959 | sb->layout = mddev->layout; | |
960 | sb->chunk_size = mddev->chunk_size; | |
961 | ||
a654b9d8 N |
962 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
963 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
964 | ||
1da177e4 | 965 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 966 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 967 | mdp_disk_t *d; |
86e6ffdd | 968 | int desc_nr; |
b2d444d7 N |
969 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
970 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 971 | desc_nr = rdev2->raid_disk; |
1da177e4 | 972 | else |
86e6ffdd | 973 | desc_nr = next_spare++; |
19133a42 | 974 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
975 | d = &sb->disks[rdev2->desc_nr]; |
976 | nr_disks++; | |
977 | d->number = rdev2->desc_nr; | |
978 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
979 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
980 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
981 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
982 | d->raid_disk = rdev2->raid_disk; |
983 | else | |
984 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 985 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 986 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 987 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
988 | d->state = (1<<MD_DISK_ACTIVE); |
989 | d->state |= (1<<MD_DISK_SYNC); | |
990 | active++; | |
991 | working++; | |
992 | } else { | |
993 | d->state = 0; | |
994 | spare++; | |
995 | working++; | |
996 | } | |
8ddf9efe N |
997 | if (test_bit(WriteMostly, &rdev2->flags)) |
998 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 999 | } |
1da177e4 LT |
1000 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1001 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1002 | mdp_disk_t *d = &sb->disks[i]; | |
1003 | if (d->state == 0 && d->number == 0) { | |
1004 | d->number = i; | |
1005 | d->raid_disk = i; | |
1006 | d->state = (1<<MD_DISK_REMOVED); | |
1007 | d->state |= (1<<MD_DISK_FAULTY); | |
1008 | failed++; | |
1009 | } | |
1010 | } | |
1011 | sb->nr_disks = nr_disks; | |
1012 | sb->active_disks = active; | |
1013 | sb->working_disks = working; | |
1014 | sb->failed_disks = failed; | |
1015 | sb->spare_disks = spare; | |
1016 | ||
1017 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1018 | sb->sb_csum = calc_sb_csum(sb); | |
1019 | } | |
1020 | ||
0cd17fec CW |
1021 | /* |
1022 | * rdev_size_change for 0.90.0 | |
1023 | */ | |
1024 | static unsigned long long | |
15f4a5fd | 1025 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1026 | { |
15f4a5fd | 1027 | if (num_sectors && num_sectors < rdev->mddev->size * 2) |
0cd17fec | 1028 | return 0; /* component must fit device */ |
0cd17fec CW |
1029 | if (rdev->mddev->bitmap_offset) |
1030 | return 0; /* can't move bitmap */ | |
0f420358 | 1031 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1032 | if (!num_sectors || num_sectors > rdev->sb_start) |
1033 | num_sectors = rdev->sb_start; | |
0f420358 | 1034 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1035 | rdev->sb_page); |
1036 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1037 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1038 | } |
1039 | ||
1040 | ||
1da177e4 LT |
1041 | /* |
1042 | * version 1 superblock | |
1043 | */ | |
1044 | ||
1c05b4bc | 1045 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1046 | { |
1c05b4bc N |
1047 | __le32 disk_csum; |
1048 | u32 csum; | |
1da177e4 LT |
1049 | unsigned long long newcsum; |
1050 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1051 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1052 | int i; |
1053 | ||
1054 | disk_csum = sb->sb_csum; | |
1055 | sb->sb_csum = 0; | |
1056 | newcsum = 0; | |
1057 | for (i=0; size>=4; size -= 4 ) | |
1058 | newcsum += le32_to_cpu(*isuper++); | |
1059 | ||
1060 | if (size == 2) | |
1c05b4bc | 1061 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1062 | |
1063 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1064 | sb->sb_csum = disk_csum; | |
1065 | return cpu_to_le32(csum); | |
1066 | } | |
1067 | ||
1068 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1069 | { | |
1070 | struct mdp_superblock_1 *sb; | |
1071 | int ret; | |
0f420358 | 1072 | sector_t sb_start; |
1da177e4 | 1073 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1074 | int bmask; |
1da177e4 LT |
1075 | |
1076 | /* | |
0f420358 | 1077 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1078 | * It is always aligned to a 4K boundary and |
1079 | * depeding on minor_version, it can be: | |
1080 | * 0: At least 8K, but less than 12K, from end of device | |
1081 | * 1: At start of device | |
1082 | * 2: 4K from start of device. | |
1083 | */ | |
1084 | switch(minor_version) { | |
1085 | case 0: | |
0f420358 AN |
1086 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1087 | sb_start -= 8*2; | |
1088 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1089 | break; |
1090 | case 1: | |
0f420358 | 1091 | sb_start = 0; |
1da177e4 LT |
1092 | break; |
1093 | case 2: | |
0f420358 | 1094 | sb_start = 8; |
1da177e4 LT |
1095 | break; |
1096 | default: | |
1097 | return -EINVAL; | |
1098 | } | |
0f420358 | 1099 | rdev->sb_start = sb_start; |
1da177e4 | 1100 | |
0002b271 N |
1101 | /* superblock is rarely larger than 1K, but it can be larger, |
1102 | * and it is safe to read 4k, so we do that | |
1103 | */ | |
1104 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1105 | if (ret) return ret; |
1106 | ||
1107 | ||
1108 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1109 | ||
1110 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1111 | sb->major_version != cpu_to_le32(1) || | |
1112 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1113 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1114 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1115 | return -EINVAL; |
1116 | ||
1117 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1118 | printk("md: invalid superblock checksum on %s\n", | |
1119 | bdevname(rdev->bdev,b)); | |
1120 | return -EINVAL; | |
1121 | } | |
1122 | if (le64_to_cpu(sb->data_size) < 10) { | |
1123 | printk("md: data_size too small on %s\n", | |
1124 | bdevname(rdev->bdev,b)); | |
1125 | return -EINVAL; | |
1126 | } | |
e11e93fa N |
1127 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1128 | if (sb->level != cpu_to_le32(1) && | |
1129 | sb->level != cpu_to_le32(4) && | |
1130 | sb->level != cpu_to_le32(5) && | |
1131 | sb->level != cpu_to_le32(6) && | |
1132 | sb->level != cpu_to_le32(10)) { | |
1133 | printk(KERN_WARNING | |
1134 | "md: bitmaps not supported for this level.\n"); | |
1135 | return -EINVAL; | |
1136 | } | |
1137 | } | |
1138 | ||
1da177e4 LT |
1139 | rdev->preferred_minor = 0xffff; |
1140 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1141 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1142 | |
0002b271 | 1143 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1144 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1145 | if (rdev->sb_size & bmask) |
a1801f85 N |
1146 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1147 | ||
1148 | if (minor_version | |
0f420358 | 1149 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1150 | return -EINVAL; |
0002b271 | 1151 | |
31b65a0d N |
1152 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1153 | rdev->desc_nr = -1; | |
1154 | else | |
1155 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1156 | ||
9a7b2b0f | 1157 | if (!refdev) { |
8ed75463 | 1158 | ret = 1; |
9a7b2b0f | 1159 | } else { |
1da177e4 LT |
1160 | __u64 ev1, ev2; |
1161 | struct mdp_superblock_1 *refsb = | |
1162 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1163 | ||
1164 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1165 | sb->level != refsb->level || | |
1166 | sb->layout != refsb->layout || | |
1167 | sb->chunksize != refsb->chunksize) { | |
1168 | printk(KERN_WARNING "md: %s has strangely different" | |
1169 | " superblock to %s\n", | |
1170 | bdevname(rdev->bdev,b), | |
1171 | bdevname(refdev->bdev,b2)); | |
1172 | return -EINVAL; | |
1173 | } | |
1174 | ev1 = le64_to_cpu(sb->events); | |
1175 | ev2 = le64_to_cpu(refsb->events); | |
1176 | ||
1177 | if (ev1 > ev2) | |
8ed75463 N |
1178 | ret = 1; |
1179 | else | |
1180 | ret = 0; | |
1da177e4 | 1181 | } |
a1801f85 | 1182 | if (minor_version) |
1da177e4 LT |
1183 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; |
1184 | else | |
0f420358 | 1185 | rdev->size = rdev->sb_start / 2; |
1da177e4 LT |
1186 | if (rdev->size < le64_to_cpu(sb->data_size)/2) |
1187 | return -EINVAL; | |
1188 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1189 | if (le32_to_cpu(sb->chunksize)) | |
1190 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1191 | |
1c05b4bc | 1192 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1193 | return -EINVAL; |
8ed75463 | 1194 | return ret; |
1da177e4 LT |
1195 | } |
1196 | ||
1197 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1198 | { | |
1199 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1200 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1201 | |
41158c7e | 1202 | rdev->raid_disk = -1; |
c5d79adb N |
1203 | clear_bit(Faulty, &rdev->flags); |
1204 | clear_bit(In_sync, &rdev->flags); | |
1205 | clear_bit(WriteMostly, &rdev->flags); | |
1206 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1207 | ||
1da177e4 LT |
1208 | if (mddev->raid_disks == 0) { |
1209 | mddev->major_version = 1; | |
1210 | mddev->patch_version = 0; | |
e691063a | 1211 | mddev->external = 0; |
1da177e4 LT |
1212 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1213 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1214 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1215 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1216 | mddev->clevel[0] = 0; |
1da177e4 LT |
1217 | mddev->layout = le32_to_cpu(sb->layout); |
1218 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1219 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1220 | mddev->events = ev1; |
9223214e | 1221 | mddev->bitmap_offset = 0; |
29fc7e3e | 1222 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1223 | |
1224 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1225 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1226 | ||
1227 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1228 | |
71c0805c | 1229 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1230 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1231 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1232 | |
f6705578 N |
1233 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1234 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1235 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1236 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1237 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1238 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1239 | } else { | |
1240 | mddev->reshape_position = MaxSector; | |
1241 | mddev->delta_disks = 0; | |
1242 | mddev->new_level = mddev->level; | |
1243 | mddev->new_layout = mddev->layout; | |
1244 | mddev->new_chunk = mddev->chunk_size; | |
1245 | } | |
1246 | ||
41158c7e N |
1247 | } else if (mddev->pers == NULL) { |
1248 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1249 | ++ev1; |
1250 | if (ev1 < mddev->events) | |
1251 | return -EINVAL; | |
41158c7e N |
1252 | } else if (mddev->bitmap) { |
1253 | /* If adding to array with a bitmap, then we can accept an | |
1254 | * older device, but not too old. | |
1255 | */ | |
41158c7e N |
1256 | if (ev1 < mddev->bitmap->events_cleared) |
1257 | return 0; | |
07d84d10 N |
1258 | } else { |
1259 | if (ev1 < mddev->events) | |
1260 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1261 | return 0; | |
1262 | } | |
1da177e4 LT |
1263 | if (mddev->level != LEVEL_MULTIPATH) { |
1264 | int role; | |
1da177e4 LT |
1265 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1266 | switch(role) { | |
1267 | case 0xffff: /* spare */ | |
1da177e4 LT |
1268 | break; |
1269 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1270 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1271 | break; |
1272 | default: | |
5fd6c1dc N |
1273 | if ((le32_to_cpu(sb->feature_map) & |
1274 | MD_FEATURE_RECOVERY_OFFSET)) | |
1275 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1276 | else | |
1277 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1278 | rdev->raid_disk = role; |
1279 | break; | |
1280 | } | |
8ddf9efe N |
1281 | if (sb->devflags & WriteMostly1) |
1282 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1283 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1284 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1285 | |
1da177e4 LT |
1286 | return 0; |
1287 | } | |
1288 | ||
1289 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1290 | { | |
1291 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1292 | mdk_rdev_t *rdev2; |
1293 | int max_dev, i; | |
1294 | /* make rdev->sb match mddev and rdev data. */ | |
1295 | ||
1296 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1297 | ||
1298 | sb->feature_map = 0; | |
1299 | sb->pad0 = 0; | |
5fd6c1dc | 1300 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1301 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1302 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1303 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1304 | ||
1305 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1306 | sb->events = cpu_to_le64(mddev->events); | |
1307 | if (mddev->in_sync) | |
1308 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1309 | else | |
1310 | sb->resync_offset = cpu_to_le64(0); | |
1311 | ||
1c05b4bc | 1312 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1313 | |
f0ca340c | 1314 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1315 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1316 | |
a654b9d8 N |
1317 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1318 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1319 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1320 | } |
5fd6c1dc N |
1321 | |
1322 | if (rdev->raid_disk >= 0 && | |
1323 | !test_bit(In_sync, &rdev->flags) && | |
1324 | rdev->recovery_offset > 0) { | |
1325 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1326 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1327 | } | |
1328 | ||
f6705578 N |
1329 | if (mddev->reshape_position != MaxSector) { |
1330 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1331 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1332 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1333 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1334 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1335 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1336 | } | |
a654b9d8 | 1337 | |
1da177e4 | 1338 | max_dev = 0; |
159ec1fc | 1339 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1340 | if (rdev2->desc_nr+1 > max_dev) |
1341 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1342 | |
1343 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1344 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1345 | for (i=0; i<max_dev;i++) |
1346 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1347 | ||
159ec1fc | 1348 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1349 | i = rdev2->desc_nr; |
b2d444d7 | 1350 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1351 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1352 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1353 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1354 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1355 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1356 | else |
1357 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1358 | } | |
1359 | ||
1da177e4 LT |
1360 | sb->sb_csum = calc_sb_1_csum(sb); |
1361 | } | |
1362 | ||
0cd17fec | 1363 | static unsigned long long |
15f4a5fd | 1364 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1365 | { |
1366 | struct mdp_superblock_1 *sb; | |
15f4a5fd AN |
1367 | sector_t max_sectors; |
1368 | if (num_sectors && num_sectors < rdev->mddev->size * 2) | |
0cd17fec | 1369 | return 0; /* component must fit device */ |
0f420358 | 1370 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1371 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1372 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1373 | max_sectors -= rdev->data_offset; | |
1374 | if (!num_sectors || num_sectors > max_sectors) | |
1375 | num_sectors = max_sectors; | |
0cd17fec CW |
1376 | } else if (rdev->mddev->bitmap_offset) { |
1377 | /* minor version 0 with bitmap we can't move */ | |
1378 | return 0; | |
1379 | } else { | |
1380 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1381 | sector_t sb_start; |
1382 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1383 | sb_start &= ~(sector_t)(4*2 - 1); | |
15f4a5fd AN |
1384 | max_sectors = rdev->size * 2 + sb_start - rdev->sb_start; |
1385 | if (!num_sectors || num_sectors > max_sectors) | |
1386 | num_sectors = max_sectors; | |
0f420358 | 1387 | rdev->sb_start = sb_start; |
0cd17fec CW |
1388 | } |
1389 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1390 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1391 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1392 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1393 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1394 | rdev->sb_page); |
1395 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1396 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1397 | } |
1da177e4 | 1398 | |
75c96f85 | 1399 | static struct super_type super_types[] = { |
1da177e4 LT |
1400 | [0] = { |
1401 | .name = "0.90.0", | |
1402 | .owner = THIS_MODULE, | |
0cd17fec CW |
1403 | .load_super = super_90_load, |
1404 | .validate_super = super_90_validate, | |
1405 | .sync_super = super_90_sync, | |
1406 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1407 | }, |
1408 | [1] = { | |
1409 | .name = "md-1", | |
1410 | .owner = THIS_MODULE, | |
0cd17fec CW |
1411 | .load_super = super_1_load, |
1412 | .validate_super = super_1_validate, | |
1413 | .sync_super = super_1_sync, | |
1414 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1415 | }, |
1416 | }; | |
1da177e4 LT |
1417 | |
1418 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1419 | { | |
7dd5e7c3 | 1420 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1421 | |
4b80991c N |
1422 | rcu_read_lock(); |
1423 | rdev_for_each_rcu(rdev, mddev1) | |
1424 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1425 | if (rdev->bdev->bd_contains == |
4b80991c N |
1426 | rdev2->bdev->bd_contains) { |
1427 | rcu_read_unlock(); | |
7dd5e7c3 | 1428 | return 1; |
4b80991c N |
1429 | } |
1430 | rcu_read_unlock(); | |
1da177e4 LT |
1431 | return 0; |
1432 | } | |
1433 | ||
1434 | static LIST_HEAD(pending_raid_disks); | |
1435 | ||
3f9d99c1 MP |
1436 | static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev) |
1437 | { | |
1438 | struct mdk_personality *pers = mddev->pers; | |
1439 | struct gendisk *disk = mddev->gendisk; | |
1440 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); | |
1441 | struct blk_integrity *bi_mddev = blk_get_integrity(disk); | |
1442 | ||
1443 | /* Data integrity passthrough not supported on RAID 4, 5 and 6 */ | |
1444 | if (pers && pers->level >= 4 && pers->level <= 6) | |
1445 | return; | |
1446 | ||
1447 | /* If rdev is integrity capable, register profile for mddev */ | |
1448 | if (!bi_mddev && bi_rdev) { | |
1449 | if (blk_integrity_register(disk, bi_rdev)) | |
1450 | printk(KERN_ERR "%s: %s Could not register integrity!\n", | |
1451 | __func__, disk->disk_name); | |
1452 | else | |
1453 | printk(KERN_NOTICE "Enabling data integrity on %s\n", | |
1454 | disk->disk_name); | |
1455 | return; | |
1456 | } | |
1457 | ||
1458 | /* Check that mddev and rdev have matching profiles */ | |
1459 | if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) { | |
1460 | printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__, | |
1461 | disk->disk_name, rdev->bdev->bd_disk->disk_name); | |
1462 | printk(KERN_NOTICE "Disabling data integrity on %s\n", | |
1463 | disk->disk_name); | |
1464 | blk_integrity_unregister(disk); | |
1465 | } | |
1466 | } | |
1467 | ||
1da177e4 LT |
1468 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1469 | { | |
7dd5e7c3 | 1470 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1471 | struct kobject *ko; |
1edf80d3 | 1472 | char *s; |
5e55e2f5 | 1473 | int err; |
1da177e4 LT |
1474 | |
1475 | if (rdev->mddev) { | |
1476 | MD_BUG(); | |
1477 | return -EINVAL; | |
1478 | } | |
11e2ede0 DW |
1479 | |
1480 | /* prevent duplicates */ | |
1481 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1482 | return -EEXIST; | |
1483 | ||
2bf071bf N |
1484 | /* make sure rdev->size exceeds mddev->size */ |
1485 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1486 | if (mddev->pers) { |
1487 | /* Cannot change size, so fail | |
1488 | * If mddev->level <= 0, then we don't care | |
1489 | * about aligning sizes (e.g. linear) | |
1490 | */ | |
1491 | if (mddev->level > 0) | |
1492 | return -ENOSPC; | |
1493 | } else | |
2bf071bf N |
1494 | mddev->size = rdev->size; |
1495 | } | |
1da177e4 LT |
1496 | |
1497 | /* Verify rdev->desc_nr is unique. | |
1498 | * If it is -1, assign a free number, else | |
1499 | * check number is not in use | |
1500 | */ | |
1501 | if (rdev->desc_nr < 0) { | |
1502 | int choice = 0; | |
1503 | if (mddev->pers) choice = mddev->raid_disks; | |
1504 | while (find_rdev_nr(mddev, choice)) | |
1505 | choice++; | |
1506 | rdev->desc_nr = choice; | |
1507 | } else { | |
1508 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1509 | return -EBUSY; | |
1510 | } | |
de01dfad N |
1511 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1512 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1513 | mdname(mddev), mddev->max_disks); | |
1514 | return -EBUSY; | |
1515 | } | |
19133a42 | 1516 | bdevname(rdev->bdev,b); |
649316b2 | 1517 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1518 | *s = '!'; |
649316b2 | 1519 | |
1da177e4 | 1520 | rdev->mddev = mddev; |
19133a42 | 1521 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1522 | |
b2d6db58 | 1523 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1524 | goto fail; |
86e6ffdd | 1525 | |
0762b8bd | 1526 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1527 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1528 | kobject_del(&rdev->kobj); | |
1529 | goto fail; | |
1530 | } | |
3c0ee63a N |
1531 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1532 | ||
4b80991c | 1533 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1534 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1535 | |
1536 | /* May as well allow recovery to be retried once */ | |
1537 | mddev->recovery_disabled = 0; | |
3f9d99c1 MP |
1538 | |
1539 | md_integrity_check(rdev, mddev); | |
1da177e4 | 1540 | return 0; |
5e55e2f5 N |
1541 | |
1542 | fail: | |
1543 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1544 | b, mdname(mddev)); | |
1545 | return err; | |
1da177e4 LT |
1546 | } |
1547 | ||
177a99b2 | 1548 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1549 | { |
1550 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1551 | kobject_del(&rdev->kobj); | |
177a99b2 | 1552 | kobject_put(&rdev->kobj); |
5792a285 N |
1553 | } |
1554 | ||
1da177e4 LT |
1555 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1556 | { | |
1557 | char b[BDEVNAME_SIZE]; | |
1558 | if (!rdev->mddev) { | |
1559 | MD_BUG(); | |
1560 | return; | |
1561 | } | |
5463c790 | 1562 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1563 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1564 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1565 | rdev->mddev = NULL; | |
86e6ffdd | 1566 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1567 | sysfs_put(rdev->sysfs_state); |
1568 | rdev->sysfs_state = NULL; | |
5792a285 | 1569 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1570 | * writing to 'remove' to "dev/state". We also need |
1571 | * to delay it due to rcu usage. | |
5792a285 | 1572 | */ |
4b80991c | 1573 | synchronize_rcu(); |
177a99b2 N |
1574 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1575 | kobject_get(&rdev->kobj); | |
5792a285 | 1576 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | /* | |
1580 | * prevent the device from being mounted, repartitioned or | |
1581 | * otherwise reused by a RAID array (or any other kernel | |
1582 | * subsystem), by bd_claiming the device. | |
1583 | */ | |
c5d79adb | 1584 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1585 | { |
1586 | int err = 0; | |
1587 | struct block_device *bdev; | |
1588 | char b[BDEVNAME_SIZE]; | |
1589 | ||
2e7b651d | 1590 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1591 | if (IS_ERR(bdev)) { |
1592 | printk(KERN_ERR "md: could not open %s.\n", | |
1593 | __bdevname(dev, b)); | |
1594 | return PTR_ERR(bdev); | |
1595 | } | |
c5d79adb | 1596 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1597 | if (err) { |
1598 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1599 | bdevname(bdev, b)); | |
9a1c3542 | 1600 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1601 | return err; |
1602 | } | |
c5d79adb N |
1603 | if (!shared) |
1604 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1605 | rdev->bdev = bdev; |
1606 | return err; | |
1607 | } | |
1608 | ||
1609 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1610 | { | |
1611 | struct block_device *bdev = rdev->bdev; | |
1612 | rdev->bdev = NULL; | |
1613 | if (!bdev) | |
1614 | MD_BUG(); | |
1615 | bd_release(bdev); | |
9a1c3542 | 1616 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1617 | } |
1618 | ||
1619 | void md_autodetect_dev(dev_t dev); | |
1620 | ||
1621 | static void export_rdev(mdk_rdev_t * rdev) | |
1622 | { | |
1623 | char b[BDEVNAME_SIZE]; | |
1624 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1625 | bdevname(rdev->bdev,b)); | |
1626 | if (rdev->mddev) | |
1627 | MD_BUG(); | |
1628 | free_disk_sb(rdev); | |
1da177e4 | 1629 | #ifndef MODULE |
d0fae18f N |
1630 | if (test_bit(AutoDetected, &rdev->flags)) |
1631 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1632 | #endif |
1633 | unlock_rdev(rdev); | |
86e6ffdd | 1634 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1635 | } |
1636 | ||
1637 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1638 | { | |
1639 | unbind_rdev_from_array(rdev); | |
1640 | export_rdev(rdev); | |
1641 | } | |
1642 | ||
1643 | static void export_array(mddev_t *mddev) | |
1644 | { | |
159ec1fc | 1645 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1646 | |
d089c6af | 1647 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1648 | if (!rdev->mddev) { |
1649 | MD_BUG(); | |
1650 | continue; | |
1651 | } | |
1652 | kick_rdev_from_array(rdev); | |
1653 | } | |
1654 | if (!list_empty(&mddev->disks)) | |
1655 | MD_BUG(); | |
1656 | mddev->raid_disks = 0; | |
1657 | mddev->major_version = 0; | |
1658 | } | |
1659 | ||
1660 | static void print_desc(mdp_disk_t *desc) | |
1661 | { | |
1662 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1663 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1664 | } | |
1665 | ||
cd2ac932 | 1666 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1667 | { |
1668 | int i; | |
1669 | ||
1670 | printk(KERN_INFO | |
1671 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1672 | sb->major_version, sb->minor_version, sb->patch_version, | |
1673 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1674 | sb->ctime); | |
1675 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1676 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1677 | sb->md_minor, sb->layout, sb->chunk_size); | |
1678 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1679 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1680 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1681 | sb->failed_disks, sb->spare_disks, | |
1682 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1683 | ||
1684 | printk(KERN_INFO); | |
1685 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1686 | mdp_disk_t *desc; | |
1687 | ||
1688 | desc = sb->disks + i; | |
1689 | if (desc->number || desc->major || desc->minor || | |
1690 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1691 | printk(" D %2d: ", i); | |
1692 | print_desc(desc); | |
1693 | } | |
1694 | } | |
1695 | printk(KERN_INFO "md: THIS: "); | |
1696 | print_desc(&sb->this_disk); | |
cd2ac932 | 1697 | } |
1da177e4 | 1698 | |
cd2ac932 CR |
1699 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1700 | { | |
1701 | __u8 *uuid; | |
1702 | ||
1703 | uuid = sb->set_uuid; | |
1704 | printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1705 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1706 | KERN_INFO "md: Name: \"%s\" CT:%llu\n", | |
1707 | le32_to_cpu(sb->major_version), | |
1708 | le32_to_cpu(sb->feature_map), | |
1709 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1710 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1711 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1712 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1713 | sb->set_name, | |
1714 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1715 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1716 | ||
1717 | uuid = sb->device_uuid; | |
1718 | printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
1719 | " RO:%llu\n" | |
1720 | KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" | |
1721 | ":%02x%02x%02x%02x%02x%02x\n" | |
1722 | KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1723 | KERN_INFO "md: (MaxDev:%u) \n", | |
1724 | le32_to_cpu(sb->level), | |
1725 | (unsigned long long)le64_to_cpu(sb->size), | |
1726 | le32_to_cpu(sb->raid_disks), | |
1727 | le32_to_cpu(sb->layout), | |
1728 | le32_to_cpu(sb->chunksize), | |
1729 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1730 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1731 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1732 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1733 | le32_to_cpu(sb->dev_number), | |
1734 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1735 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1736 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1737 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1738 | sb->devflags, | |
1739 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1740 | (unsigned long long)le64_to_cpu(sb->events), | |
1741 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1742 | le32_to_cpu(sb->sb_csum), | |
1743 | le32_to_cpu(sb->max_dev) | |
1744 | ); | |
1da177e4 LT |
1745 | } |
1746 | ||
cd2ac932 | 1747 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1748 | { |
1749 | char b[BDEVNAME_SIZE]; | |
1750 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1751 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1752 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1753 | rdev->desc_nr); | |
1da177e4 | 1754 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1755 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1756 | switch (major_version) { | |
1757 | case 0: | |
1758 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1759 | break; | |
1760 | case 1: | |
1761 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1762 | break; | |
1763 | } | |
1da177e4 LT |
1764 | } else |
1765 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1766 | } | |
1767 | ||
5e56341d | 1768 | static void md_print_devices(void) |
1da177e4 | 1769 | { |
159ec1fc | 1770 | struct list_head *tmp; |
1da177e4 LT |
1771 | mdk_rdev_t *rdev; |
1772 | mddev_t *mddev; | |
1773 | char b[BDEVNAME_SIZE]; | |
1774 | ||
1775 | printk("\n"); | |
1776 | printk("md: **********************************\n"); | |
1777 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1778 | printk("md: **********************************\n"); | |
29ac4aa3 | 1779 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1780 | |
32a7627c N |
1781 | if (mddev->bitmap) |
1782 | bitmap_print_sb(mddev->bitmap); | |
1783 | else | |
1784 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 1785 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
1786 | printk("<%s>", bdevname(rdev->bdev,b)); |
1787 | printk("\n"); | |
1788 | ||
159ec1fc | 1789 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 1790 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
1791 | } |
1792 | printk("md: **********************************\n"); | |
1793 | printk("\n"); | |
1794 | } | |
1795 | ||
1796 | ||
42543769 | 1797 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1798 | { |
42543769 N |
1799 | /* Update each superblock (in-memory image), but |
1800 | * if we are allowed to, skip spares which already | |
1801 | * have the right event counter, or have one earlier | |
1802 | * (which would mean they aren't being marked as dirty | |
1803 | * with the rest of the array) | |
1804 | */ | |
1da177e4 | 1805 | mdk_rdev_t *rdev; |
1da177e4 | 1806 | |
159ec1fc | 1807 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
1808 | if (rdev->sb_events == mddev->events || |
1809 | (nospares && | |
1810 | rdev->raid_disk < 0 && | |
1811 | (rdev->sb_events&1)==0 && | |
1812 | rdev->sb_events+1 == mddev->events)) { | |
1813 | /* Don't update this superblock */ | |
1814 | rdev->sb_loaded = 2; | |
1815 | } else { | |
1816 | super_types[mddev->major_version]. | |
1817 | sync_super(mddev, rdev); | |
1818 | rdev->sb_loaded = 1; | |
1819 | } | |
1da177e4 LT |
1820 | } |
1821 | } | |
1822 | ||
850b2b42 | 1823 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1824 | { |
1da177e4 | 1825 | mdk_rdev_t *rdev; |
06d91a5f | 1826 | int sync_req; |
42543769 | 1827 | int nospares = 0; |
1da177e4 | 1828 | |
8377bc80 N |
1829 | if (mddev->external) |
1830 | return; | |
1da177e4 | 1831 | repeat: |
a9701a30 | 1832 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1833 | |
850b2b42 N |
1834 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1835 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1836 | force_change = 1; | |
1837 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1838 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1839 | * though if events isn't the right even/odd, we will have to do | |
1840 | * spares after all | |
1841 | */ | |
1842 | nospares = 1; | |
1843 | if (force_change) | |
1844 | nospares = 0; | |
1845 | if (mddev->degraded) | |
84692195 N |
1846 | /* If the array is degraded, then skipping spares is both |
1847 | * dangerous and fairly pointless. | |
1848 | * Dangerous because a device that was removed from the array | |
1849 | * might have a event_count that still looks up-to-date, | |
1850 | * so it can be re-added without a resync. | |
1851 | * Pointless because if there are any spares to skip, | |
1852 | * then a recovery will happen and soon that array won't | |
1853 | * be degraded any more and the spare can go back to sleep then. | |
1854 | */ | |
850b2b42 | 1855 | nospares = 0; |
84692195 | 1856 | |
06d91a5f | 1857 | sync_req = mddev->in_sync; |
1da177e4 | 1858 | mddev->utime = get_seconds(); |
42543769 N |
1859 | |
1860 | /* If this is just a dirty<->clean transition, and the array is clean | |
1861 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1862 | if (nospares |
42543769 | 1863 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1864 | && (mddev->events & 1) |
1865 | && mddev->events != 1) | |
42543769 N |
1866 | mddev->events--; |
1867 | else { | |
1868 | /* otherwise we have to go forward and ... */ | |
1869 | mddev->events ++; | |
1870 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1871 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1872 | if ((mddev->events&1)==0) { | |
1873 | mddev->events++; | |
1874 | nospares = 0; | |
1875 | } | |
1876 | } else { | |
1877 | /* otherwise insist on an even 'events' (for clean states) */ | |
1878 | if ((mddev->events&1)) { | |
1879 | mddev->events++; | |
1880 | nospares = 0; | |
1881 | } | |
1882 | } | |
1883 | } | |
1da177e4 LT |
1884 | |
1885 | if (!mddev->events) { | |
1886 | /* | |
1887 | * oops, this 64-bit counter should never wrap. | |
1888 | * Either we are in around ~1 trillion A.C., assuming | |
1889 | * 1 reboot per second, or we have a bug: | |
1890 | */ | |
1891 | MD_BUG(); | |
1892 | mddev->events --; | |
1893 | } | |
1da177e4 LT |
1894 | |
1895 | /* | |
1896 | * do not write anything to disk if using | |
1897 | * nonpersistent superblocks | |
1898 | */ | |
06d91a5f | 1899 | if (!mddev->persistent) { |
e691063a N |
1900 | if (!mddev->external) |
1901 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1902 | ||
a9701a30 | 1903 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1904 | wake_up(&mddev->sb_wait); |
1da177e4 | 1905 | return; |
06d91a5f | 1906 | } |
e691063a | 1907 | sync_sbs(mddev, nospares); |
a9701a30 | 1908 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1909 | |
1910 | dprintk(KERN_INFO | |
1911 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1912 | mdname(mddev),mddev->in_sync); | |
1913 | ||
4ad13663 | 1914 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 1915 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
1916 | char b[BDEVNAME_SIZE]; |
1917 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1918 | if (rdev->sb_loaded != 1) |
1919 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1920 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1921 | dprintk("(skipping faulty "); |
1922 | ||
1923 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1924 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1925 | md_super_write(mddev,rdev, |
0f420358 | 1926 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
1927 | rdev->sb_page); |
1928 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1929 | bdevname(rdev->bdev,b), | |
0f420358 | 1930 | (unsigned long long)rdev->sb_start); |
42543769 | 1931 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1932 | |
1da177e4 LT |
1933 | } else |
1934 | dprintk(")\n"); | |
7bfa19f2 | 1935 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1936 | /* only need to write one superblock... */ |
1937 | break; | |
1938 | } | |
a9701a30 | 1939 | md_super_wait(mddev); |
850b2b42 | 1940 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1941 | |
a9701a30 | 1942 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1943 | if (mddev->in_sync != sync_req || |
1944 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1945 | /* have to write it out again */ |
a9701a30 | 1946 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1947 | goto repeat; |
1948 | } | |
850b2b42 | 1949 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1950 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1951 | wake_up(&mddev->sb_wait); |
06d91a5f | 1952 | |
1da177e4 LT |
1953 | } |
1954 | ||
7f6ce769 | 1955 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
1956 | * We want to accept with case. For this we use cmd_match. |
1957 | */ | |
1958 | static int cmd_match(const char *cmd, const char *str) | |
1959 | { | |
1960 | /* See if cmd, written into a sysfs file, matches | |
1961 | * str. They must either be the same, or cmd can | |
1962 | * have a trailing newline | |
1963 | */ | |
1964 | while (*cmd && *str && *cmd == *str) { | |
1965 | cmd++; | |
1966 | str++; | |
1967 | } | |
1968 | if (*cmd == '\n') | |
1969 | cmd++; | |
1970 | if (*str || *cmd) | |
1971 | return 0; | |
1972 | return 1; | |
1973 | } | |
1974 | ||
86e6ffdd N |
1975 | struct rdev_sysfs_entry { |
1976 | struct attribute attr; | |
1977 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1978 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1979 | }; | |
1980 | ||
1981 | static ssize_t | |
96de1e66 | 1982 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1983 | { |
1984 | char *sep = ""; | |
20a49ff6 | 1985 | size_t len = 0; |
86e6ffdd | 1986 | |
b2d444d7 | 1987 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1988 | len+= sprintf(page+len, "%sfaulty",sep); |
1989 | sep = ","; | |
1990 | } | |
b2d444d7 | 1991 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1992 | len += sprintf(page+len, "%sin_sync",sep); |
1993 | sep = ","; | |
1994 | } | |
f655675b N |
1995 | if (test_bit(WriteMostly, &rdev->flags)) { |
1996 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1997 | sep = ","; | |
1998 | } | |
6bfe0b49 DW |
1999 | if (test_bit(Blocked, &rdev->flags)) { |
2000 | len += sprintf(page+len, "%sblocked", sep); | |
2001 | sep = ","; | |
2002 | } | |
b2d444d7 N |
2003 | if (!test_bit(Faulty, &rdev->flags) && |
2004 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2005 | len += sprintf(page+len, "%sspare", sep); |
2006 | sep = ","; | |
2007 | } | |
2008 | return len+sprintf(page+len, "\n"); | |
2009 | } | |
2010 | ||
45dc2de1 N |
2011 | static ssize_t |
2012 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2013 | { | |
2014 | /* can write | |
2015 | * faulty - simulates and error | |
2016 | * remove - disconnects the device | |
f655675b N |
2017 | * writemostly - sets write_mostly |
2018 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2019 | * blocked - sets the Blocked flag |
2020 | * -blocked - clears the Blocked flag | |
45dc2de1 N |
2021 | */ |
2022 | int err = -EINVAL; | |
2023 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2024 | md_error(rdev->mddev, rdev); | |
2025 | err = 0; | |
2026 | } else if (cmd_match(buf, "remove")) { | |
2027 | if (rdev->raid_disk >= 0) | |
2028 | err = -EBUSY; | |
2029 | else { | |
2030 | mddev_t *mddev = rdev->mddev; | |
2031 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2032 | if (mddev->pers) |
2033 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2034 | md_new_event(mddev); |
2035 | err = 0; | |
2036 | } | |
f655675b N |
2037 | } else if (cmd_match(buf, "writemostly")) { |
2038 | set_bit(WriteMostly, &rdev->flags); | |
2039 | err = 0; | |
2040 | } else if (cmd_match(buf, "-writemostly")) { | |
2041 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2042 | err = 0; |
2043 | } else if (cmd_match(buf, "blocked")) { | |
2044 | set_bit(Blocked, &rdev->flags); | |
2045 | err = 0; | |
2046 | } else if (cmd_match(buf, "-blocked")) { | |
2047 | clear_bit(Blocked, &rdev->flags); | |
2048 | wake_up(&rdev->blocked_wait); | |
2049 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2050 | md_wakeup_thread(rdev->mddev->thread); | |
2051 | ||
f655675b | 2052 | err = 0; |
45dc2de1 | 2053 | } |
3c0ee63a N |
2054 | if (!err && rdev->sysfs_state) |
2055 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
2056 | return err ? err : len; |
2057 | } | |
80ca3a44 N |
2058 | static struct rdev_sysfs_entry rdev_state = |
2059 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2060 | |
4dbcdc75 N |
2061 | static ssize_t |
2062 | errors_show(mdk_rdev_t *rdev, char *page) | |
2063 | { | |
2064 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2065 | } | |
2066 | ||
2067 | static ssize_t | |
2068 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2069 | { | |
2070 | char *e; | |
2071 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2072 | if (*buf && (*e == 0 || *e == '\n')) { | |
2073 | atomic_set(&rdev->corrected_errors, n); | |
2074 | return len; | |
2075 | } | |
2076 | return -EINVAL; | |
2077 | } | |
2078 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2079 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2080 | |
014236d2 N |
2081 | static ssize_t |
2082 | slot_show(mdk_rdev_t *rdev, char *page) | |
2083 | { | |
2084 | if (rdev->raid_disk < 0) | |
2085 | return sprintf(page, "none\n"); | |
2086 | else | |
2087 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2088 | } | |
2089 | ||
2090 | static ssize_t | |
2091 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2092 | { | |
2093 | char *e; | |
c303da6d N |
2094 | int err; |
2095 | char nm[20]; | |
014236d2 N |
2096 | int slot = simple_strtoul(buf, &e, 10); |
2097 | if (strncmp(buf, "none", 4)==0) | |
2098 | slot = -1; | |
2099 | else if (e==buf || (*e && *e!= '\n')) | |
2100 | return -EINVAL; | |
6c2fce2e | 2101 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2102 | /* Setting 'slot' on an active array requires also |
2103 | * updating the 'rd%d' link, and communicating | |
2104 | * with the personality with ->hot_*_disk. | |
2105 | * For now we only support removing | |
2106 | * failed/spare devices. This normally happens automatically, | |
2107 | * but not when the metadata is externally managed. | |
2108 | */ | |
c303da6d N |
2109 | if (rdev->raid_disk == -1) |
2110 | return -EEXIST; | |
2111 | /* personality does all needed checks */ | |
2112 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2113 | return -EINVAL; | |
2114 | err = rdev->mddev->pers-> | |
2115 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2116 | if (err) | |
2117 | return err; | |
2118 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2119 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2120 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2121 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2122 | } else if (rdev->mddev->pers) { |
2123 | mdk_rdev_t *rdev2; | |
6c2fce2e NB |
2124 | /* Activating a spare .. or possibly reactivating |
2125 | * if we every get bitmaps working here. | |
2126 | */ | |
2127 | ||
2128 | if (rdev->raid_disk != -1) | |
2129 | return -EBUSY; | |
2130 | ||
2131 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2132 | return -EINVAL; | |
2133 | ||
159ec1fc | 2134 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2135 | if (rdev2->raid_disk == slot) |
2136 | return -EEXIST; | |
2137 | ||
2138 | rdev->raid_disk = slot; | |
2139 | if (test_bit(In_sync, &rdev->flags)) | |
2140 | rdev->saved_raid_disk = slot; | |
2141 | else | |
2142 | rdev->saved_raid_disk = -1; | |
2143 | err = rdev->mddev->pers-> | |
2144 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2145 | if (err) { |
6c2fce2e | 2146 | rdev->raid_disk = -1; |
6c2fce2e | 2147 | return err; |
52664732 | 2148 | } else |
3c0ee63a | 2149 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2150 | sprintf(nm, "rd%d", rdev->raid_disk); |
2151 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2152 | printk(KERN_WARNING | |
2153 | "md: cannot register " | |
2154 | "%s for %s\n", | |
2155 | nm, mdname(rdev->mddev)); | |
2156 | ||
2157 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2158 | } else { |
2159 | if (slot >= rdev->mddev->raid_disks) | |
2160 | return -ENOSPC; | |
2161 | rdev->raid_disk = slot; | |
2162 | /* assume it is working */ | |
c5d79adb N |
2163 | clear_bit(Faulty, &rdev->flags); |
2164 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2165 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2166 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2167 | } |
014236d2 N |
2168 | return len; |
2169 | } | |
2170 | ||
2171 | ||
2172 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2173 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2174 | |
93c8cad0 N |
2175 | static ssize_t |
2176 | offset_show(mdk_rdev_t *rdev, char *page) | |
2177 | { | |
6961ece4 | 2178 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2179 | } |
2180 | ||
2181 | static ssize_t | |
2182 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2183 | { | |
2184 | char *e; | |
2185 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2186 | if (e==buf || (*e && *e != '\n')) | |
2187 | return -EINVAL; | |
8ed0a521 | 2188 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2189 | return -EBUSY; |
c5d79adb N |
2190 | if (rdev->size && rdev->mddev->external) |
2191 | /* Must set offset before size, so overlap checks | |
2192 | * can be sane */ | |
2193 | return -EBUSY; | |
93c8cad0 N |
2194 | rdev->data_offset = offset; |
2195 | return len; | |
2196 | } | |
2197 | ||
2198 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2199 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2200 | |
83303b61 N |
2201 | static ssize_t |
2202 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2203 | { | |
2204 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
2205 | } | |
2206 | ||
c5d79adb N |
2207 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2208 | { | |
2209 | /* check if two start/length pairs overlap */ | |
2210 | if (s1+l1 <= s2) | |
2211 | return 0; | |
2212 | if (s2+l2 <= s1) | |
2213 | return 0; | |
2214 | return 1; | |
2215 | } | |
2216 | ||
83303b61 N |
2217 | static ssize_t |
2218 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2219 | { | |
d7027458 | 2220 | unsigned long long size; |
c5d79adb | 2221 | unsigned long long oldsize = rdev->size; |
27c529bb N |
2222 | mddev_t *my_mddev = rdev->mddev; |
2223 | ||
d7027458 NB |
2224 | if (strict_strtoull(buf, 10, &size) < 0) |
2225 | return -EINVAL; | |
0cd17fec | 2226 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 NB |
2227 | if (my_mddev->persistent) { |
2228 | size = super_types[my_mddev->major_version]. | |
15f4a5fd | 2229 | rdev_size_change(rdev, size * 2); |
0cd17fec CW |
2230 | if (!size) |
2231 | return -EBUSY; | |
2232 | } else if (!size) { | |
2233 | size = (rdev->bdev->bd_inode->i_size >> 10); | |
2234 | size -= rdev->data_offset/2; | |
2235 | } | |
0cd17fec | 2236 | } |
7d3c6f87 CW |
2237 | if (size < my_mddev->size) |
2238 | return -EINVAL; /* component must fit device */ | |
0cd17fec | 2239 | |
83303b61 | 2240 | rdev->size = size; |
d7027458 | 2241 | if (size > oldsize && my_mddev->external) { |
c5d79adb N |
2242 | /* need to check that all other rdevs with the same ->bdev |
2243 | * do not overlap. We need to unlock the mddev to avoid | |
2244 | * a deadlock. We have already changed rdev->size, and if | |
2245 | * we have to change it back, we will have the lock again. | |
2246 | */ | |
2247 | mddev_t *mddev; | |
2248 | int overlap = 0; | |
159ec1fc | 2249 | struct list_head *tmp; |
c5d79adb | 2250 | |
27c529bb | 2251 | mddev_unlock(my_mddev); |
29ac4aa3 | 2252 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2253 | mdk_rdev_t *rdev2; |
2254 | ||
2255 | mddev_lock(mddev); | |
159ec1fc | 2256 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2257 | if (test_bit(AllReserved, &rdev2->flags) || |
2258 | (rdev->bdev == rdev2->bdev && | |
2259 | rdev != rdev2 && | |
d07bd3bc AN |
2260 | overlaps(rdev->data_offset, rdev->size * 2, |
2261 | rdev2->data_offset, | |
2262 | rdev2->size * 2))) { | |
c5d79adb N |
2263 | overlap = 1; |
2264 | break; | |
2265 | } | |
2266 | mddev_unlock(mddev); | |
2267 | if (overlap) { | |
2268 | mddev_put(mddev); | |
2269 | break; | |
2270 | } | |
2271 | } | |
27c529bb | 2272 | mddev_lock(my_mddev); |
c5d79adb N |
2273 | if (overlap) { |
2274 | /* Someone else could have slipped in a size | |
2275 | * change here, but doing so is just silly. | |
2276 | * We put oldsize back because we *know* it is | |
2277 | * safe, and trust userspace not to race with | |
2278 | * itself | |
2279 | */ | |
2280 | rdev->size = oldsize; | |
2281 | return -EBUSY; | |
2282 | } | |
2283 | } | |
83303b61 N |
2284 | return len; |
2285 | } | |
2286 | ||
2287 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2288 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2289 | |
86e6ffdd N |
2290 | static struct attribute *rdev_default_attrs[] = { |
2291 | &rdev_state.attr, | |
4dbcdc75 | 2292 | &rdev_errors.attr, |
014236d2 | 2293 | &rdev_slot.attr, |
93c8cad0 | 2294 | &rdev_offset.attr, |
83303b61 | 2295 | &rdev_size.attr, |
86e6ffdd N |
2296 | NULL, |
2297 | }; | |
2298 | static ssize_t | |
2299 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2300 | { | |
2301 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2302 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2303 | mddev_t *mddev = rdev->mddev; |
2304 | ssize_t rv; | |
86e6ffdd N |
2305 | |
2306 | if (!entry->show) | |
2307 | return -EIO; | |
27c529bb N |
2308 | |
2309 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2310 | if (!rv) { | |
2311 | if (rdev->mddev == NULL) | |
2312 | rv = -EBUSY; | |
2313 | else | |
2314 | rv = entry->show(rdev, page); | |
2315 | mddev_unlock(mddev); | |
2316 | } | |
2317 | return rv; | |
86e6ffdd N |
2318 | } |
2319 | ||
2320 | static ssize_t | |
2321 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2322 | const char *page, size_t length) | |
2323 | { | |
2324 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2325 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2326 | ssize_t rv; |
2327 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2328 | |
2329 | if (!entry->store) | |
2330 | return -EIO; | |
67463acb N |
2331 | if (!capable(CAP_SYS_ADMIN)) |
2332 | return -EACCES; | |
27c529bb | 2333 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2334 | if (!rv) { |
27c529bb N |
2335 | if (rdev->mddev == NULL) |
2336 | rv = -EBUSY; | |
2337 | else | |
2338 | rv = entry->store(rdev, page, length); | |
6a51830e | 2339 | mddev_unlock(mddev); |
ca388059 N |
2340 | } |
2341 | return rv; | |
86e6ffdd N |
2342 | } |
2343 | ||
2344 | static void rdev_free(struct kobject *ko) | |
2345 | { | |
2346 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2347 | kfree(rdev); | |
2348 | } | |
2349 | static struct sysfs_ops rdev_sysfs_ops = { | |
2350 | .show = rdev_attr_show, | |
2351 | .store = rdev_attr_store, | |
2352 | }; | |
2353 | static struct kobj_type rdev_ktype = { | |
2354 | .release = rdev_free, | |
2355 | .sysfs_ops = &rdev_sysfs_ops, | |
2356 | .default_attrs = rdev_default_attrs, | |
2357 | }; | |
2358 | ||
1da177e4 LT |
2359 | /* |
2360 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2361 | * | |
2362 | * mark the device faulty if: | |
2363 | * | |
2364 | * - the device is nonexistent (zero size) | |
2365 | * - the device has no valid superblock | |
2366 | * | |
2367 | * a faulty rdev _never_ has rdev->sb set. | |
2368 | */ | |
2369 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2370 | { | |
2371 | char b[BDEVNAME_SIZE]; | |
2372 | int err; | |
2373 | mdk_rdev_t *rdev; | |
2374 | sector_t size; | |
2375 | ||
9ffae0cf | 2376 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2377 | if (!rdev) { |
2378 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2379 | return ERR_PTR(-ENOMEM); | |
2380 | } | |
1da177e4 LT |
2381 | |
2382 | if ((err = alloc_disk_sb(rdev))) | |
2383 | goto abort_free; | |
2384 | ||
c5d79adb | 2385 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2386 | if (err) |
2387 | goto abort_free; | |
2388 | ||
f9cb074b | 2389 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2390 | |
1da177e4 | 2391 | rdev->desc_nr = -1; |
2b6e8459 | 2392 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2393 | rdev->raid_disk = -1; |
b2d444d7 | 2394 | rdev->flags = 0; |
1da177e4 | 2395 | rdev->data_offset = 0; |
42543769 | 2396 | rdev->sb_events = 0; |
1da177e4 | 2397 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2398 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2399 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2400 | |
2401 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2402 | if (!size) { | |
2403 | printk(KERN_WARNING | |
2404 | "md: %s has zero or unknown size, marking faulty!\n", | |
2405 | bdevname(rdev->bdev,b)); | |
2406 | err = -EINVAL; | |
2407 | goto abort_free; | |
2408 | } | |
2409 | ||
2410 | if (super_format >= 0) { | |
2411 | err = super_types[super_format]. | |
2412 | load_super(rdev, NULL, super_minor); | |
2413 | if (err == -EINVAL) { | |
df968c4e N |
2414 | printk(KERN_WARNING |
2415 | "md: %s does not have a valid v%d.%d " | |
2416 | "superblock, not importing!\n", | |
2417 | bdevname(rdev->bdev,b), | |
2418 | super_format, super_minor); | |
1da177e4 LT |
2419 | goto abort_free; |
2420 | } | |
2421 | if (err < 0) { | |
2422 | printk(KERN_WARNING | |
2423 | "md: could not read %s's sb, not importing!\n", | |
2424 | bdevname(rdev->bdev,b)); | |
2425 | goto abort_free; | |
2426 | } | |
2427 | } | |
6bfe0b49 | 2428 | |
1da177e4 | 2429 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2430 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2431 | |
2432 | return rdev; | |
2433 | ||
2434 | abort_free: | |
2435 | if (rdev->sb_page) { | |
2436 | if (rdev->bdev) | |
2437 | unlock_rdev(rdev); | |
2438 | free_disk_sb(rdev); | |
2439 | } | |
2440 | kfree(rdev); | |
2441 | return ERR_PTR(err); | |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * Check a full RAID array for plausibility | |
2446 | */ | |
2447 | ||
2448 | ||
a757e64c | 2449 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2450 | { |
2451 | int i; | |
159ec1fc | 2452 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2453 | char b[BDEVNAME_SIZE]; |
2454 | ||
2455 | freshest = NULL; | |
d089c6af | 2456 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2457 | switch (super_types[mddev->major_version]. |
2458 | load_super(rdev, freshest, mddev->minor_version)) { | |
2459 | case 1: | |
2460 | freshest = rdev; | |
2461 | break; | |
2462 | case 0: | |
2463 | break; | |
2464 | default: | |
2465 | printk( KERN_ERR \ | |
2466 | "md: fatal superblock inconsistency in %s" | |
2467 | " -- removing from array\n", | |
2468 | bdevname(rdev->bdev,b)); | |
2469 | kick_rdev_from_array(rdev); | |
2470 | } | |
2471 | ||
2472 | ||
2473 | super_types[mddev->major_version]. | |
2474 | validate_super(mddev, freshest); | |
2475 | ||
2476 | i = 0; | |
d089c6af | 2477 | rdev_for_each(rdev, tmp, mddev) { |
de01dfad N |
2478 | if (rdev->desc_nr >= mddev->max_disks || |
2479 | i > mddev->max_disks) { | |
2480 | printk(KERN_WARNING | |
2481 | "md: %s: %s: only %d devices permitted\n", | |
2482 | mdname(mddev), bdevname(rdev->bdev, b), | |
2483 | mddev->max_disks); | |
2484 | kick_rdev_from_array(rdev); | |
2485 | continue; | |
2486 | } | |
1da177e4 LT |
2487 | if (rdev != freshest) |
2488 | if (super_types[mddev->major_version]. | |
2489 | validate_super(mddev, rdev)) { | |
2490 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2491 | " from array!\n", | |
2492 | bdevname(rdev->bdev,b)); | |
2493 | kick_rdev_from_array(rdev); | |
2494 | continue; | |
2495 | } | |
2496 | if (mddev->level == LEVEL_MULTIPATH) { | |
2497 | rdev->desc_nr = i++; | |
2498 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2499 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2500 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2501 | rdev->raid_disk = -1; | |
2502 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2503 | } |
2504 | } | |
2505 | ||
2506 | ||
2507 | ||
2508 | if (mddev->recovery_cp != MaxSector && | |
2509 | mddev->level >= 1) | |
2510 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2511 | " -- starting background reconstruction\n", | |
2512 | mdname(mddev)); | |
2513 | ||
1da177e4 LT |
2514 | } |
2515 | ||
19052c0e N |
2516 | static void md_safemode_timeout(unsigned long data); |
2517 | ||
16f17b39 N |
2518 | static ssize_t |
2519 | safe_delay_show(mddev_t *mddev, char *page) | |
2520 | { | |
2521 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2522 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2523 | } | |
2524 | static ssize_t | |
2525 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2526 | { | |
2527 | int scale=1; | |
2528 | int dot=0; | |
2529 | int i; | |
2530 | unsigned long msec; | |
2531 | char buf[30]; | |
97ce0a7f | 2532 | |
16f17b39 N |
2533 | /* remove a period, and count digits after it */ |
2534 | if (len >= sizeof(buf)) | |
2535 | return -EINVAL; | |
97ce0a7f | 2536 | strlcpy(buf, cbuf, sizeof(buf)); |
16f17b39 N |
2537 | for (i=0; i<len; i++) { |
2538 | if (dot) { | |
2539 | if (isdigit(buf[i])) { | |
2540 | buf[i-1] = buf[i]; | |
2541 | scale *= 10; | |
2542 | } | |
2543 | buf[i] = 0; | |
2544 | } else if (buf[i] == '.') { | |
2545 | dot=1; | |
2546 | buf[i] = 0; | |
2547 | } | |
2548 | } | |
97ce0a7f | 2549 | if (strict_strtoul(buf, 10, &msec) < 0) |
16f17b39 N |
2550 | return -EINVAL; |
2551 | msec = (msec * 1000) / scale; | |
2552 | if (msec == 0) | |
2553 | mddev->safemode_delay = 0; | |
2554 | else { | |
19052c0e | 2555 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2556 | mddev->safemode_delay = (msec*HZ)/1000; |
2557 | if (mddev->safemode_delay == 0) | |
2558 | mddev->safemode_delay = 1; | |
19052c0e N |
2559 | if (mddev->safemode_delay < old_delay) |
2560 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2561 | } |
2562 | return len; | |
2563 | } | |
2564 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2565 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2566 | |
eae1701f | 2567 | static ssize_t |
96de1e66 | 2568 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2569 | { |
2604b703 | 2570 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2571 | if (p) |
eae1701f | 2572 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2573 | else if (mddev->clevel[0]) |
2574 | return sprintf(page, "%s\n", mddev->clevel); | |
2575 | else if (mddev->level != LEVEL_NONE) | |
2576 | return sprintf(page, "%d\n", mddev->level); | |
2577 | else | |
2578 | return 0; | |
eae1701f N |
2579 | } |
2580 | ||
d9d166c2 N |
2581 | static ssize_t |
2582 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2583 | { | |
20a49ff6 | 2584 | ssize_t rv = len; |
d9d166c2 N |
2585 | if (mddev->pers) |
2586 | return -EBUSY; | |
2587 | if (len == 0) | |
2588 | return 0; | |
2589 | if (len >= sizeof(mddev->clevel)) | |
2590 | return -ENOSPC; | |
2591 | strncpy(mddev->clevel, buf, len); | |
2592 | if (mddev->clevel[len-1] == '\n') | |
2593 | len--; | |
2594 | mddev->clevel[len] = 0; | |
2595 | mddev->level = LEVEL_NONE; | |
2596 | return rv; | |
2597 | } | |
2598 | ||
2599 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2600 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2601 | |
d4dbd025 N |
2602 | |
2603 | static ssize_t | |
2604 | layout_show(mddev_t *mddev, char *page) | |
2605 | { | |
2606 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2607 | if (mddev->reshape_position != MaxSector && |
2608 | mddev->layout != mddev->new_layout) | |
2609 | return sprintf(page, "%d (%d)\n", | |
2610 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2611 | return sprintf(page, "%d\n", mddev->layout); |
2612 | } | |
2613 | ||
2614 | static ssize_t | |
2615 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2616 | { | |
2617 | char *e; | |
2618 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2619 | |
2620 | if (!*buf || (*e && *e != '\n')) | |
2621 | return -EINVAL; | |
2622 | ||
08a02ecd N |
2623 | if (mddev->pers) |
2624 | return -EBUSY; | |
2625 | if (mddev->reshape_position != MaxSector) | |
2626 | mddev->new_layout = n; | |
2627 | else | |
2628 | mddev->layout = n; | |
d4dbd025 N |
2629 | return len; |
2630 | } | |
2631 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2632 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2633 | |
2634 | ||
eae1701f | 2635 | static ssize_t |
96de1e66 | 2636 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2637 | { |
bb636547 N |
2638 | if (mddev->raid_disks == 0) |
2639 | return 0; | |
08a02ecd N |
2640 | if (mddev->reshape_position != MaxSector && |
2641 | mddev->delta_disks != 0) | |
2642 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2643 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2644 | return sprintf(page, "%d\n", mddev->raid_disks); |
2645 | } | |
2646 | ||
da943b99 N |
2647 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2648 | ||
2649 | static ssize_t | |
2650 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2651 | { | |
da943b99 N |
2652 | char *e; |
2653 | int rv = 0; | |
2654 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2655 | ||
2656 | if (!*buf || (*e && *e != '\n')) | |
2657 | return -EINVAL; | |
2658 | ||
2659 | if (mddev->pers) | |
2660 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2661 | else if (mddev->reshape_position != MaxSector) { |
2662 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2663 | mddev->delta_disks = n - olddisks; | |
2664 | mddev->raid_disks = n; | |
2665 | } else | |
da943b99 N |
2666 | mddev->raid_disks = n; |
2667 | return rv ? rv : len; | |
2668 | } | |
2669 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2670 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2671 | |
3b34380a N |
2672 | static ssize_t |
2673 | chunk_size_show(mddev_t *mddev, char *page) | |
2674 | { | |
08a02ecd N |
2675 | if (mddev->reshape_position != MaxSector && |
2676 | mddev->chunk_size != mddev->new_chunk) | |
2677 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2678 | mddev->chunk_size); | |
3b34380a N |
2679 | return sprintf(page, "%d\n", mddev->chunk_size); |
2680 | } | |
2681 | ||
2682 | static ssize_t | |
2683 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2684 | { | |
2685 | /* can only set chunk_size if array is not yet active */ | |
2686 | char *e; | |
2687 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2688 | ||
3b34380a N |
2689 | if (!*buf || (*e && *e != '\n')) |
2690 | return -EINVAL; | |
2691 | ||
08a02ecd N |
2692 | if (mddev->pers) |
2693 | return -EBUSY; | |
2694 | else if (mddev->reshape_position != MaxSector) | |
2695 | mddev->new_chunk = n; | |
2696 | else | |
2697 | mddev->chunk_size = n; | |
3b34380a N |
2698 | return len; |
2699 | } | |
2700 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2701 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2702 | |
a94213b1 N |
2703 | static ssize_t |
2704 | resync_start_show(mddev_t *mddev, char *page) | |
2705 | { | |
2706 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2707 | } | |
2708 | ||
2709 | static ssize_t | |
2710 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2711 | { | |
a94213b1 N |
2712 | char *e; |
2713 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2714 | ||
2715 | if (mddev->pers) | |
2716 | return -EBUSY; | |
2717 | if (!*buf || (*e && *e != '\n')) | |
2718 | return -EINVAL; | |
2719 | ||
2720 | mddev->recovery_cp = n; | |
2721 | return len; | |
2722 | } | |
2723 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2724 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2725 | |
9e653b63 N |
2726 | /* |
2727 | * The array state can be: | |
2728 | * | |
2729 | * clear | |
2730 | * No devices, no size, no level | |
2731 | * Equivalent to STOP_ARRAY ioctl | |
2732 | * inactive | |
2733 | * May have some settings, but array is not active | |
2734 | * all IO results in error | |
2735 | * When written, doesn't tear down array, but just stops it | |
2736 | * suspended (not supported yet) | |
2737 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2738 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2739 | * readonly |
2740 | * no resync can happen. no superblocks get written. | |
2741 | * write requests fail | |
2742 | * read-auto | |
2743 | * like readonly, but behaves like 'clean' on a write request. | |
2744 | * | |
2745 | * clean - no pending writes, but otherwise active. | |
2746 | * When written to inactive array, starts without resync | |
2747 | * If a write request arrives then | |
2748 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2749 | * if not known, block and switch to write-pending | |
2750 | * If written to an active array that has pending writes, then fails. | |
2751 | * active | |
2752 | * fully active: IO and resync can be happening. | |
2753 | * When written to inactive array, starts with resync | |
2754 | * | |
2755 | * write-pending | |
2756 | * clean, but writes are blocked waiting for 'active' to be written. | |
2757 | * | |
2758 | * active-idle | |
2759 | * like active, but no writes have been seen for a while (100msec). | |
2760 | * | |
2761 | */ | |
2762 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2763 | write_pending, active_idle, bad_word}; | |
05381954 | 2764 | static char *array_states[] = { |
9e653b63 N |
2765 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2766 | "write-pending", "active-idle", NULL }; | |
2767 | ||
2768 | static int match_word(const char *word, char **list) | |
2769 | { | |
2770 | int n; | |
2771 | for (n=0; list[n]; n++) | |
2772 | if (cmd_match(word, list[n])) | |
2773 | break; | |
2774 | return n; | |
2775 | } | |
2776 | ||
2777 | static ssize_t | |
2778 | array_state_show(mddev_t *mddev, char *page) | |
2779 | { | |
2780 | enum array_state st = inactive; | |
2781 | ||
2782 | if (mddev->pers) | |
2783 | switch(mddev->ro) { | |
2784 | case 1: | |
2785 | st = readonly; | |
2786 | break; | |
2787 | case 2: | |
2788 | st = read_auto; | |
2789 | break; | |
2790 | case 0: | |
2791 | if (mddev->in_sync) | |
2792 | st = clean; | |
e691063a N |
2793 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2794 | st = write_pending; | |
9e653b63 N |
2795 | else if (mddev->safemode) |
2796 | st = active_idle; | |
2797 | else | |
2798 | st = active; | |
2799 | } | |
2800 | else { | |
2801 | if (list_empty(&mddev->disks) && | |
2802 | mddev->raid_disks == 0 && | |
2803 | mddev->size == 0) | |
2804 | st = clear; | |
2805 | else | |
2806 | st = inactive; | |
2807 | } | |
2808 | return sprintf(page, "%s\n", array_states[st]); | |
2809 | } | |
2810 | ||
df5b20cf | 2811 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
2812 | static int do_md_run(mddev_t * mddev); |
2813 | static int restart_array(mddev_t *mddev); | |
2814 | ||
2815 | static ssize_t | |
2816 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2817 | { | |
2818 | int err = -EINVAL; | |
2819 | enum array_state st = match_word(buf, array_states); | |
2820 | switch(st) { | |
2821 | case bad_word: | |
2822 | break; | |
2823 | case clear: | |
2824 | /* stopping an active array */ | |
f2ea68cf | 2825 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 2826 | return -EBUSY; |
df5b20cf | 2827 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
2828 | break; |
2829 | case inactive: | |
2830 | /* stopping an active array */ | |
2831 | if (mddev->pers) { | |
f2ea68cf | 2832 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 2833 | return -EBUSY; |
df5b20cf | 2834 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
2835 | } else |
2836 | err = 0; /* already inactive */ | |
9e653b63 N |
2837 | break; |
2838 | case suspended: | |
2839 | break; /* not supported yet */ | |
2840 | case readonly: | |
2841 | if (mddev->pers) | |
df5b20cf | 2842 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
2843 | else { |
2844 | mddev->ro = 1; | |
648b629e | 2845 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
2846 | err = do_md_run(mddev); |
2847 | } | |
2848 | break; | |
2849 | case read_auto: | |
9e653b63 | 2850 | if (mddev->pers) { |
80268ee9 | 2851 | if (mddev->ro == 0) |
df5b20cf | 2852 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 2853 | else if (mddev->ro == 1) |
648b629e N |
2854 | err = restart_array(mddev); |
2855 | if (err == 0) { | |
2856 | mddev->ro = 2; | |
2857 | set_disk_ro(mddev->gendisk, 0); | |
2858 | } | |
9e653b63 N |
2859 | } else { |
2860 | mddev->ro = 2; | |
2861 | err = do_md_run(mddev); | |
2862 | } | |
2863 | break; | |
2864 | case clean: | |
2865 | if (mddev->pers) { | |
2866 | restart_array(mddev); | |
2867 | spin_lock_irq(&mddev->write_lock); | |
2868 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2869 | if (mddev->in_sync == 0) { |
2870 | mddev->in_sync = 1; | |
31a59e34 N |
2871 | if (mddev->safemode == 1) |
2872 | mddev->safemode = 0; | |
e691063a N |
2873 | if (mddev->persistent) |
2874 | set_bit(MD_CHANGE_CLEAN, | |
2875 | &mddev->flags); | |
2876 | } | |
2877 | err = 0; | |
2878 | } else | |
2879 | err = -EBUSY; | |
9e653b63 N |
2880 | spin_unlock_irq(&mddev->write_lock); |
2881 | } else { | |
2882 | mddev->ro = 0; | |
2883 | mddev->recovery_cp = MaxSector; | |
2884 | err = do_md_run(mddev); | |
2885 | } | |
2886 | break; | |
2887 | case active: | |
2888 | if (mddev->pers) { | |
2889 | restart_array(mddev); | |
e691063a N |
2890 | if (mddev->external) |
2891 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2892 | wake_up(&mddev->sb_wait); |
2893 | err = 0; | |
2894 | } else { | |
2895 | mddev->ro = 0; | |
648b629e | 2896 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
2897 | err = do_md_run(mddev); |
2898 | } | |
2899 | break; | |
2900 | case write_pending: | |
2901 | case active_idle: | |
2902 | /* these cannot be set */ | |
2903 | break; | |
2904 | } | |
2905 | if (err) | |
2906 | return err; | |
0fd62b86 | 2907 | else { |
b62b7590 | 2908 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 2909 | return len; |
0fd62b86 | 2910 | } |
9e653b63 | 2911 | } |
80ca3a44 N |
2912 | static struct md_sysfs_entry md_array_state = |
2913 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2914 | |
6d7ff738 N |
2915 | static ssize_t |
2916 | null_show(mddev_t *mddev, char *page) | |
2917 | { | |
2918 | return -EINVAL; | |
2919 | } | |
2920 | ||
2921 | static ssize_t | |
2922 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2923 | { | |
2924 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2925 | /* The new device is added to the array. | |
2926 | * If the array has a persistent superblock, we read the | |
2927 | * superblock to initialise info and check validity. | |
2928 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2929 | * which mainly checks size. | |
2930 | */ | |
2931 | char *e; | |
2932 | int major = simple_strtoul(buf, &e, 10); | |
2933 | int minor; | |
2934 | dev_t dev; | |
2935 | mdk_rdev_t *rdev; | |
2936 | int err; | |
2937 | ||
2938 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2939 | return -EINVAL; | |
2940 | minor = simple_strtoul(e+1, &e, 10); | |
2941 | if (*e && *e != '\n') | |
2942 | return -EINVAL; | |
2943 | dev = MKDEV(major, minor); | |
2944 | if (major != MAJOR(dev) || | |
2945 | minor != MINOR(dev)) | |
2946 | return -EOVERFLOW; | |
2947 | ||
2948 | ||
2949 | if (mddev->persistent) { | |
2950 | rdev = md_import_device(dev, mddev->major_version, | |
2951 | mddev->minor_version); | |
2952 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2953 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2954 | mdk_rdev_t, same_set); | |
2955 | err = super_types[mddev->major_version] | |
2956 | .load_super(rdev, rdev0, mddev->minor_version); | |
2957 | if (err < 0) | |
2958 | goto out; | |
2959 | } | |
c5d79adb N |
2960 | } else if (mddev->external) |
2961 | rdev = md_import_device(dev, -2, -1); | |
2962 | else | |
6d7ff738 N |
2963 | rdev = md_import_device(dev, -1, -1); |
2964 | ||
2965 | if (IS_ERR(rdev)) | |
2966 | return PTR_ERR(rdev); | |
2967 | err = bind_rdev_to_array(rdev, mddev); | |
2968 | out: | |
2969 | if (err) | |
2970 | export_rdev(rdev); | |
2971 | return err ? err : len; | |
2972 | } | |
2973 | ||
2974 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2975 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2976 | |
9b1d1dac PC |
2977 | static ssize_t |
2978 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2979 | { | |
2980 | char *end; | |
2981 | unsigned long chunk, end_chunk; | |
2982 | ||
2983 | if (!mddev->bitmap) | |
2984 | goto out; | |
2985 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2986 | while (*buf) { | |
2987 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2988 | if (buf == end) break; | |
2989 | if (*end == '-') { /* range */ | |
2990 | buf = end + 1; | |
2991 | end_chunk = simple_strtoul(buf, &end, 0); | |
2992 | if (buf == end) break; | |
2993 | } | |
2994 | if (*end && !isspace(*end)) break; | |
2995 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2996 | buf = end; | |
2997 | while (isspace(*buf)) buf++; | |
2998 | } | |
2999 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3000 | out: | |
3001 | return len; | |
3002 | } | |
3003 | ||
3004 | static struct md_sysfs_entry md_bitmap = | |
3005 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3006 | ||
a35b0d69 N |
3007 | static ssize_t |
3008 | size_show(mddev_t *mddev, char *page) | |
3009 | { | |
3010 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
3011 | } | |
3012 | ||
d71f9f88 | 3013 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3014 | |
3015 | static ssize_t | |
3016 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3017 | { | |
3018 | /* If array is inactive, we can reduce the component size, but | |
3019 | * not increase it (except from 0). | |
3020 | * If array is active, we can try an on-line resize | |
3021 | */ | |
3022 | char *e; | |
3023 | int err = 0; | |
3024 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
3025 | if (!*buf || *buf == '\n' || | |
3026 | (*e && *e != '\n')) | |
3027 | return -EINVAL; | |
3028 | ||
3029 | if (mddev->pers) { | |
d71f9f88 | 3030 | err = update_size(mddev, size * 2); |
850b2b42 | 3031 | md_update_sb(mddev, 1); |
a35b0d69 N |
3032 | } else { |
3033 | if (mddev->size == 0 || | |
3034 | mddev->size > size) | |
3035 | mddev->size = size; | |
3036 | else | |
3037 | err = -ENOSPC; | |
3038 | } | |
3039 | return err ? err : len; | |
3040 | } | |
3041 | ||
3042 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3043 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3044 | |
8bb93aac N |
3045 | |
3046 | /* Metdata version. | |
e691063a N |
3047 | * This is one of |
3048 | * 'none' for arrays with no metadata (good luck...) | |
3049 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3050 | * or N.M for internally known formats |
3051 | */ | |
3052 | static ssize_t | |
3053 | metadata_show(mddev_t *mddev, char *page) | |
3054 | { | |
3055 | if (mddev->persistent) | |
3056 | return sprintf(page, "%d.%d\n", | |
3057 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3058 | else if (mddev->external) |
3059 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3060 | else |
3061 | return sprintf(page, "none\n"); | |
3062 | } | |
3063 | ||
3064 | static ssize_t | |
3065 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3066 | { | |
3067 | int major, minor; | |
3068 | char *e; | |
ea43ddd8 N |
3069 | /* Changing the details of 'external' metadata is |
3070 | * always permitted. Otherwise there must be | |
3071 | * no devices attached to the array. | |
3072 | */ | |
3073 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3074 | ; | |
3075 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3076 | return -EBUSY; |
3077 | ||
3078 | if (cmd_match(buf, "none")) { | |
3079 | mddev->persistent = 0; | |
e691063a N |
3080 | mddev->external = 0; |
3081 | mddev->major_version = 0; | |
3082 | mddev->minor_version = 90; | |
3083 | return len; | |
3084 | } | |
3085 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3086 | size_t namelen = len-9; |
e691063a N |
3087 | if (namelen >= sizeof(mddev->metadata_type)) |
3088 | namelen = sizeof(mddev->metadata_type)-1; | |
3089 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3090 | mddev->metadata_type[namelen] = 0; | |
3091 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3092 | mddev->metadata_type[--namelen] = 0; | |
3093 | mddev->persistent = 0; | |
3094 | mddev->external = 1; | |
8bb93aac N |
3095 | mddev->major_version = 0; |
3096 | mddev->minor_version = 90; | |
3097 | return len; | |
3098 | } | |
3099 | major = simple_strtoul(buf, &e, 10); | |
3100 | if (e==buf || *e != '.') | |
3101 | return -EINVAL; | |
3102 | buf = e+1; | |
3103 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3104 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3105 | return -EINVAL; |
50511da3 | 3106 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3107 | return -ENOENT; |
3108 | mddev->major_version = major; | |
3109 | mddev->minor_version = minor; | |
3110 | mddev->persistent = 1; | |
e691063a | 3111 | mddev->external = 0; |
8bb93aac N |
3112 | return len; |
3113 | } | |
3114 | ||
3115 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3116 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3117 | |
24dd469d | 3118 | static ssize_t |
7eec314d | 3119 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3120 | { |
7eec314d | 3121 | char *type = "idle"; |
31399d9e | 3122 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 3123 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3124 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3125 | type = "reshape"; | |
3126 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3127 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3128 | type = "resync"; | |
3129 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3130 | type = "check"; | |
3131 | else | |
3132 | type = "repair"; | |
72a23c21 | 3133 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3134 | type = "recover"; |
3135 | } | |
3136 | return sprintf(page, "%s\n", type); | |
3137 | } | |
3138 | ||
3139 | static ssize_t | |
7eec314d | 3140 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3141 | { |
7eec314d N |
3142 | if (!mddev->pers || !mddev->pers->sync_request) |
3143 | return -EINVAL; | |
3144 | ||
bce74dac | 3145 | if (cmd_match(page, "idle")) { |
7eec314d N |
3146 | if (mddev->sync_thread) { |
3147 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3148 | md_unregister_thread(mddev->sync_thread); | |
3149 | mddev->sync_thread = NULL; | |
3150 | mddev->recovery = 0; | |
3151 | } | |
03c902e1 N |
3152 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3153 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3154 | return -EBUSY; |
72a23c21 NB |
3155 | else if (cmd_match(page, "resync")) |
3156 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3157 | else if (cmd_match(page, "recover")) { | |
3158 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3159 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3160 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3161 | int err; |
3162 | if (mddev->pers->start_reshape == NULL) | |
3163 | return -EINVAL; | |
3164 | err = mddev->pers->start_reshape(mddev); | |
3165 | if (err) | |
3166 | return err; | |
a99ac971 | 3167 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3168 | } else { |
bce74dac | 3169 | if (cmd_match(page, "check")) |
7eec314d | 3170 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3171 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3172 | return -EINVAL; |
3173 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3174 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3175 | } |
03c902e1 | 3176 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3177 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3178 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3179 | return len; |
3180 | } | |
3181 | ||
9d88883e | 3182 | static ssize_t |
96de1e66 | 3183 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3184 | { |
3185 | return sprintf(page, "%llu\n", | |
3186 | (unsigned long long) mddev->resync_mismatches); | |
3187 | } | |
3188 | ||
80ca3a44 N |
3189 | static struct md_sysfs_entry md_scan_mode = |
3190 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3191 | |
96de1e66 | 3192 | |
80ca3a44 | 3193 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3194 | |
88202a0c N |
3195 | static ssize_t |
3196 | sync_min_show(mddev_t *mddev, char *page) | |
3197 | { | |
3198 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3199 | mddev->sync_speed_min ? "local": "system"); | |
3200 | } | |
3201 | ||
3202 | static ssize_t | |
3203 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3204 | { | |
3205 | int min; | |
3206 | char *e; | |
3207 | if (strncmp(buf, "system", 6)==0) { | |
3208 | mddev->sync_speed_min = 0; | |
3209 | return len; | |
3210 | } | |
3211 | min = simple_strtoul(buf, &e, 10); | |
3212 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3213 | return -EINVAL; | |
3214 | mddev->sync_speed_min = min; | |
3215 | return len; | |
3216 | } | |
3217 | ||
3218 | static struct md_sysfs_entry md_sync_min = | |
3219 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3220 | ||
3221 | static ssize_t | |
3222 | sync_max_show(mddev_t *mddev, char *page) | |
3223 | { | |
3224 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3225 | mddev->sync_speed_max ? "local": "system"); | |
3226 | } | |
3227 | ||
3228 | static ssize_t | |
3229 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3230 | { | |
3231 | int max; | |
3232 | char *e; | |
3233 | if (strncmp(buf, "system", 6)==0) { | |
3234 | mddev->sync_speed_max = 0; | |
3235 | return len; | |
3236 | } | |
3237 | max = simple_strtoul(buf, &e, 10); | |
3238 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3239 | return -EINVAL; | |
3240 | mddev->sync_speed_max = max; | |
3241 | return len; | |
3242 | } | |
3243 | ||
3244 | static struct md_sysfs_entry md_sync_max = | |
3245 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3246 | ||
d7f3d291 IP |
3247 | static ssize_t |
3248 | degraded_show(mddev_t *mddev, char *page) | |
3249 | { | |
3250 | return sprintf(page, "%d\n", mddev->degraded); | |
3251 | } | |
3252 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3253 | |
90b08710 BS |
3254 | static ssize_t |
3255 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3256 | { | |
3257 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3258 | } | |
3259 | ||
3260 | static ssize_t | |
3261 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3262 | { | |
3263 | long n; | |
3264 | ||
3265 | if (strict_strtol(buf, 10, &n)) | |
3266 | return -EINVAL; | |
3267 | ||
3268 | if (n != 0 && n != 1) | |
3269 | return -EINVAL; | |
3270 | ||
3271 | mddev->parallel_resync = n; | |
3272 | ||
3273 | if (mddev->sync_thread) | |
3274 | wake_up(&resync_wait); | |
3275 | ||
3276 | return len; | |
3277 | } | |
3278 | ||
3279 | /* force parallel resync, even with shared block devices */ | |
3280 | static struct md_sysfs_entry md_sync_force_parallel = | |
3281 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3282 | sync_force_parallel_show, sync_force_parallel_store); | |
3283 | ||
88202a0c N |
3284 | static ssize_t |
3285 | sync_speed_show(mddev_t *mddev, char *page) | |
3286 | { | |
3287 | unsigned long resync, dt, db; | |
9687a60c AN |
3288 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3289 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3290 | if (!dt) dt++; |
9687a60c AN |
3291 | db = resync - mddev->resync_mark_cnt; |
3292 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3293 | } |
3294 | ||
80ca3a44 | 3295 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3296 | |
3297 | static ssize_t | |
3298 | sync_completed_show(mddev_t *mddev, char *page) | |
3299 | { | |
3300 | unsigned long max_blocks, resync; | |
3301 | ||
3302 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3303 | max_blocks = mddev->resync_max_sectors; | |
3304 | else | |
3305 | max_blocks = mddev->size << 1; | |
3306 | ||
3307 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
3308 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
3309 | } | |
3310 | ||
80ca3a44 | 3311 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3312 | |
5e96ee65 NB |
3313 | static ssize_t |
3314 | min_sync_show(mddev_t *mddev, char *page) | |
3315 | { | |
3316 | return sprintf(page, "%llu\n", | |
3317 | (unsigned long long)mddev->resync_min); | |
3318 | } | |
3319 | static ssize_t | |
3320 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3321 | { | |
3322 | unsigned long long min; | |
3323 | if (strict_strtoull(buf, 10, &min)) | |
3324 | return -EINVAL; | |
3325 | if (min > mddev->resync_max) | |
3326 | return -EINVAL; | |
3327 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3328 | return -EBUSY; | |
3329 | ||
3330 | /* Must be a multiple of chunk_size */ | |
3331 | if (mddev->chunk_size) { | |
3332 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3333 | return -EINVAL; | |
3334 | } | |
3335 | mddev->resync_min = min; | |
3336 | ||
3337 | return len; | |
3338 | } | |
3339 | ||
3340 | static struct md_sysfs_entry md_min_sync = | |
3341 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3342 | ||
c6207277 N |
3343 | static ssize_t |
3344 | max_sync_show(mddev_t *mddev, char *page) | |
3345 | { | |
3346 | if (mddev->resync_max == MaxSector) | |
3347 | return sprintf(page, "max\n"); | |
3348 | else | |
3349 | return sprintf(page, "%llu\n", | |
3350 | (unsigned long long)mddev->resync_max); | |
3351 | } | |
3352 | static ssize_t | |
3353 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3354 | { | |
3355 | if (strncmp(buf, "max", 3) == 0) | |
3356 | mddev->resync_max = MaxSector; | |
3357 | else { | |
5e96ee65 NB |
3358 | unsigned long long max; |
3359 | if (strict_strtoull(buf, 10, &max)) | |
3360 | return -EINVAL; | |
3361 | if (max < mddev->resync_min) | |
c6207277 N |
3362 | return -EINVAL; |
3363 | if (max < mddev->resync_max && | |
3364 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3365 | return -EBUSY; | |
3366 | ||
3367 | /* Must be a multiple of chunk_size */ | |
3368 | if (mddev->chunk_size) { | |
3369 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3370 | return -EINVAL; | |
3371 | } | |
3372 | mddev->resync_max = max; | |
3373 | } | |
3374 | wake_up(&mddev->recovery_wait); | |
3375 | return len; | |
3376 | } | |
3377 | ||
3378 | static struct md_sysfs_entry md_max_sync = | |
3379 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3380 | ||
e464eafd N |
3381 | static ssize_t |
3382 | suspend_lo_show(mddev_t *mddev, char *page) | |
3383 | { | |
3384 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3385 | } | |
3386 | ||
3387 | static ssize_t | |
3388 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3389 | { | |
3390 | char *e; | |
3391 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3392 | ||
3393 | if (mddev->pers->quiesce == NULL) | |
3394 | return -EINVAL; | |
3395 | if (buf == e || (*e && *e != '\n')) | |
3396 | return -EINVAL; | |
3397 | if (new >= mddev->suspend_hi || | |
3398 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3399 | mddev->suspend_lo = new; | |
3400 | mddev->pers->quiesce(mddev, 2); | |
3401 | return len; | |
3402 | } else | |
3403 | return -EINVAL; | |
3404 | } | |
3405 | static struct md_sysfs_entry md_suspend_lo = | |
3406 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3407 | ||
3408 | ||
3409 | static ssize_t | |
3410 | suspend_hi_show(mddev_t *mddev, char *page) | |
3411 | { | |
3412 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3413 | } | |
3414 | ||
3415 | static ssize_t | |
3416 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3417 | { | |
3418 | char *e; | |
3419 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3420 | ||
3421 | if (mddev->pers->quiesce == NULL) | |
3422 | return -EINVAL; | |
3423 | if (buf == e || (*e && *e != '\n')) | |
3424 | return -EINVAL; | |
3425 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3426 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3427 | mddev->suspend_hi = new; | |
3428 | mddev->pers->quiesce(mddev, 1); | |
3429 | mddev->pers->quiesce(mddev, 0); | |
3430 | return len; | |
3431 | } else | |
3432 | return -EINVAL; | |
3433 | } | |
3434 | static struct md_sysfs_entry md_suspend_hi = | |
3435 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3436 | ||
08a02ecd N |
3437 | static ssize_t |
3438 | reshape_position_show(mddev_t *mddev, char *page) | |
3439 | { | |
3440 | if (mddev->reshape_position != MaxSector) | |
3441 | return sprintf(page, "%llu\n", | |
3442 | (unsigned long long)mddev->reshape_position); | |
3443 | strcpy(page, "none\n"); | |
3444 | return 5; | |
3445 | } | |
3446 | ||
3447 | static ssize_t | |
3448 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3449 | { | |
3450 | char *e; | |
3451 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3452 | if (mddev->pers) | |
3453 | return -EBUSY; | |
3454 | if (buf == e || (*e && *e != '\n')) | |
3455 | return -EINVAL; | |
3456 | mddev->reshape_position = new; | |
3457 | mddev->delta_disks = 0; | |
3458 | mddev->new_level = mddev->level; | |
3459 | mddev->new_layout = mddev->layout; | |
3460 | mddev->new_chunk = mddev->chunk_size; | |
3461 | return len; | |
3462 | } | |
3463 | ||
3464 | static struct md_sysfs_entry md_reshape_position = | |
3465 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3466 | reshape_position_store); | |
3467 | ||
e464eafd | 3468 | |
eae1701f N |
3469 | static struct attribute *md_default_attrs[] = { |
3470 | &md_level.attr, | |
d4dbd025 | 3471 | &md_layout.attr, |
eae1701f | 3472 | &md_raid_disks.attr, |
3b34380a | 3473 | &md_chunk_size.attr, |
a35b0d69 | 3474 | &md_size.attr, |
a94213b1 | 3475 | &md_resync_start.attr, |
8bb93aac | 3476 | &md_metadata.attr, |
6d7ff738 | 3477 | &md_new_device.attr, |
16f17b39 | 3478 | &md_safe_delay.attr, |
9e653b63 | 3479 | &md_array_state.attr, |
08a02ecd | 3480 | &md_reshape_position.attr, |
411036fa N |
3481 | NULL, |
3482 | }; | |
3483 | ||
3484 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3485 | &md_scan_mode.attr, |
9d88883e | 3486 | &md_mismatches.attr, |
88202a0c N |
3487 | &md_sync_min.attr, |
3488 | &md_sync_max.attr, | |
3489 | &md_sync_speed.attr, | |
90b08710 | 3490 | &md_sync_force_parallel.attr, |
88202a0c | 3491 | &md_sync_completed.attr, |
5e96ee65 | 3492 | &md_min_sync.attr, |
c6207277 | 3493 | &md_max_sync.attr, |
e464eafd N |
3494 | &md_suspend_lo.attr, |
3495 | &md_suspend_hi.attr, | |
9b1d1dac | 3496 | &md_bitmap.attr, |
d7f3d291 | 3497 | &md_degraded.attr, |
eae1701f N |
3498 | NULL, |
3499 | }; | |
411036fa N |
3500 | static struct attribute_group md_redundancy_group = { |
3501 | .name = NULL, | |
3502 | .attrs = md_redundancy_attrs, | |
3503 | }; | |
3504 | ||
eae1701f N |
3505 | |
3506 | static ssize_t | |
3507 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3508 | { | |
3509 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3510 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3511 | ssize_t rv; |
eae1701f N |
3512 | |
3513 | if (!entry->show) | |
3514 | return -EIO; | |
5dc5cf7d IM |
3515 | rv = mddev_lock(mddev); |
3516 | if (!rv) { | |
3517 | rv = entry->show(mddev, page); | |
3518 | mddev_unlock(mddev); | |
3519 | } | |
96de1e66 | 3520 | return rv; |
eae1701f N |
3521 | } |
3522 | ||
3523 | static ssize_t | |
3524 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3525 | const char *page, size_t length) | |
3526 | { | |
3527 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3528 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3529 | ssize_t rv; |
eae1701f N |
3530 | |
3531 | if (!entry->store) | |
3532 | return -EIO; | |
67463acb N |
3533 | if (!capable(CAP_SYS_ADMIN)) |
3534 | return -EACCES; | |
5dc5cf7d | 3535 | rv = mddev_lock(mddev); |
d3374825 N |
3536 | if (mddev->hold_active == UNTIL_IOCTL) |
3537 | mddev->hold_active = 0; | |
5dc5cf7d IM |
3538 | if (!rv) { |
3539 | rv = entry->store(mddev, page, length); | |
3540 | mddev_unlock(mddev); | |
3541 | } | |
96de1e66 | 3542 | return rv; |
eae1701f N |
3543 | } |
3544 | ||
3545 | static void md_free(struct kobject *ko) | |
3546 | { | |
3547 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
3548 | |
3549 | if (mddev->sysfs_state) | |
3550 | sysfs_put(mddev->sysfs_state); | |
3551 | ||
3552 | if (mddev->gendisk) { | |
3553 | del_gendisk(mddev->gendisk); | |
3554 | put_disk(mddev->gendisk); | |
3555 | } | |
3556 | if (mddev->queue) | |
3557 | blk_cleanup_queue(mddev->queue); | |
3558 | ||
eae1701f N |
3559 | kfree(mddev); |
3560 | } | |
3561 | ||
3562 | static struct sysfs_ops md_sysfs_ops = { | |
3563 | .show = md_attr_show, | |
3564 | .store = md_attr_store, | |
3565 | }; | |
3566 | static struct kobj_type md_ktype = { | |
3567 | .release = md_free, | |
3568 | .sysfs_ops = &md_sysfs_ops, | |
3569 | .default_attrs = md_default_attrs, | |
3570 | }; | |
3571 | ||
1da177e4 LT |
3572 | int mdp_major = 0; |
3573 | ||
efeb53c0 | 3574 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 3575 | { |
48c9c27b | 3576 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3577 | mddev_t *mddev = mddev_find(dev); |
3578 | struct gendisk *disk; | |
efeb53c0 N |
3579 | int partitioned; |
3580 | int shift; | |
3581 | int unit; | |
3830c62f | 3582 | int error; |
1da177e4 LT |
3583 | |
3584 | if (!mddev) | |
efeb53c0 N |
3585 | return -ENODEV; |
3586 | ||
3587 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
3588 | shift = partitioned ? MdpMinorShift : 0; | |
3589 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 3590 | |
d3374825 N |
3591 | /* wait for any previous instance if this device |
3592 | * to be completed removed (mddev_delayed_delete). | |
3593 | */ | |
3594 | flush_scheduled_work(); | |
3595 | ||
48c9c27b | 3596 | mutex_lock(&disks_mutex); |
1da177e4 | 3597 | if (mddev->gendisk) { |
48c9c27b | 3598 | mutex_unlock(&disks_mutex); |
1da177e4 | 3599 | mddev_put(mddev); |
efeb53c0 N |
3600 | return -EEXIST; |
3601 | } | |
3602 | ||
3603 | if (name) { | |
3604 | /* Need to ensure that 'name' is not a duplicate. | |
3605 | */ | |
3606 | mddev_t *mddev2; | |
3607 | spin_lock(&all_mddevs_lock); | |
3608 | ||
3609 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
3610 | if (mddev2->gendisk && | |
3611 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
3612 | spin_unlock(&all_mddevs_lock); | |
3613 | return -EEXIST; | |
3614 | } | |
3615 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 3616 | } |
8b765398 N |
3617 | |
3618 | mddev->queue = blk_alloc_queue(GFP_KERNEL); | |
3619 | if (!mddev->queue) { | |
3620 | mutex_unlock(&disks_mutex); | |
3621 | mddev_put(mddev); | |
efeb53c0 | 3622 | return -ENOMEM; |
8b765398 N |
3623 | } |
3624 | /* Can be unlocked because the queue is new: no concurrency */ | |
3625 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
3626 | ||
3627 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3628 | ||
1da177e4 LT |
3629 | disk = alloc_disk(1 << shift); |
3630 | if (!disk) { | |
48c9c27b | 3631 | mutex_unlock(&disks_mutex); |
8b765398 N |
3632 | blk_cleanup_queue(mddev->queue); |
3633 | mddev->queue = NULL; | |
1da177e4 | 3634 | mddev_put(mddev); |
efeb53c0 | 3635 | return -ENOMEM; |
1da177e4 | 3636 | } |
efeb53c0 | 3637 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 3638 | disk->first_minor = unit << shift; |
efeb53c0 N |
3639 | if (name) |
3640 | strcpy(disk->disk_name, name); | |
3641 | else if (partitioned) | |
1da177e4 | 3642 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3643 | else |
1da177e4 | 3644 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3645 | disk->fops = &md_fops; |
3646 | disk->private_data = mddev; | |
3647 | disk->queue = mddev->queue; | |
92850bbd | 3648 | /* Allow extended partitions. This makes the |
d3374825 | 3649 | * 'mdp' device redundant, but we can't really |
92850bbd N |
3650 | * remove it now. |
3651 | */ | |
3652 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
3653 | add_disk(disk); |
3654 | mddev->gendisk = disk; | |
ed9e1982 TH |
3655 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
3656 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
f48ed538 | 3657 | mutex_unlock(&disks_mutex); |
3830c62f | 3658 | if (error) |
5e55e2f5 N |
3659 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3660 | disk->disk_name); | |
b62b7590 | 3661 | else { |
3830c62f | 3662 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
3663 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
3664 | } | |
d3374825 | 3665 | mddev_put(mddev); |
efeb53c0 N |
3666 | return 0; |
3667 | } | |
3668 | ||
3669 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3670 | { | |
3671 | md_alloc(dev, NULL); | |
1da177e4 LT |
3672 | return NULL; |
3673 | } | |
3674 | ||
efeb53c0 N |
3675 | static int add_named_array(const char *val, struct kernel_param *kp) |
3676 | { | |
3677 | /* val must be "md_*" where * is not all digits. | |
3678 | * We allocate an array with a large free minor number, and | |
3679 | * set the name to val. val must not already be an active name. | |
3680 | */ | |
3681 | int len = strlen(val); | |
3682 | char buf[DISK_NAME_LEN]; | |
3683 | ||
3684 | while (len && val[len-1] == '\n') | |
3685 | len--; | |
3686 | if (len >= DISK_NAME_LEN) | |
3687 | return -E2BIG; | |
3688 | strlcpy(buf, val, len+1); | |
3689 | if (strncmp(buf, "md_", 3) != 0) | |
3690 | return -EINVAL; | |
3691 | return md_alloc(0, buf); | |
3692 | } | |
3693 | ||
1da177e4 LT |
3694 | static void md_safemode_timeout(unsigned long data) |
3695 | { | |
3696 | mddev_t *mddev = (mddev_t *) data; | |
3697 | ||
0fd62b86 NB |
3698 | if (!atomic_read(&mddev->writes_pending)) { |
3699 | mddev->safemode = 1; | |
3700 | if (mddev->external) | |
b62b7590 | 3701 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 3702 | } |
1da177e4 LT |
3703 | md_wakeup_thread(mddev->thread); |
3704 | } | |
3705 | ||
6ff8d8ec | 3706 | static int start_dirty_degraded; |
1da177e4 LT |
3707 | |
3708 | static int do_md_run(mddev_t * mddev) | |
3709 | { | |
2604b703 | 3710 | int err; |
1da177e4 | 3711 | int chunk_size; |
1da177e4 LT |
3712 | mdk_rdev_t *rdev; |
3713 | struct gendisk *disk; | |
2604b703 | 3714 | struct mdk_personality *pers; |
1da177e4 LT |
3715 | char b[BDEVNAME_SIZE]; |
3716 | ||
a757e64c N |
3717 | if (list_empty(&mddev->disks)) |
3718 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3719 | return -EINVAL; |
1da177e4 LT |
3720 | |
3721 | if (mddev->pers) | |
3722 | return -EBUSY; | |
3723 | ||
3724 | /* | |
3725 | * Analyze all RAID superblock(s) | |
3726 | */ | |
1ec4a939 N |
3727 | if (!mddev->raid_disks) { |
3728 | if (!mddev->persistent) | |
3729 | return -EINVAL; | |
a757e64c | 3730 | analyze_sbs(mddev); |
1ec4a939 | 3731 | } |
1da177e4 LT |
3732 | |
3733 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3734 | |
3735 | if (chunk_size) { | |
1da177e4 LT |
3736 | if (chunk_size > MAX_CHUNK_SIZE) { |
3737 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3738 | chunk_size, MAX_CHUNK_SIZE); | |
3739 | return -EINVAL; | |
3740 | } | |
3741 | /* | |
4bbf3771 | 3742 | * chunk-size has to be a power of 2 |
1da177e4 LT |
3743 | */ |
3744 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3745 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3746 | return -EINVAL; |
3747 | } | |
1da177e4 LT |
3748 | |
3749 | /* devices must have minimum size of one chunk */ | |
159ec1fc | 3750 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3751 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3752 | continue; |
3753 | if (rdev->size < chunk_size / 1024) { | |
3754 | printk(KERN_WARNING | |
3755 | "md: Dev %s smaller than chunk_size:" | |
3756 | " %lluk < %dk\n", | |
3757 | bdevname(rdev->bdev,b), | |
3758 | (unsigned long long)rdev->size, | |
3759 | chunk_size / 1024); | |
3760 | return -EINVAL; | |
3761 | } | |
3762 | } | |
3763 | } | |
3764 | ||
d9d166c2 N |
3765 | if (mddev->level != LEVEL_NONE) |
3766 | request_module("md-level-%d", mddev->level); | |
3767 | else if (mddev->clevel[0]) | |
3768 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3769 | |
3770 | /* | |
3771 | * Drop all container device buffers, from now on | |
3772 | * the only valid external interface is through the md | |
3773 | * device. | |
1da177e4 | 3774 | */ |
159ec1fc | 3775 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3776 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3777 | continue; |
3778 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3779 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3780 | |
3781 | /* perform some consistency tests on the device. | |
3782 | * We don't want the data to overlap the metadata, | |
3783 | * Internal Bitmap issues has handled elsewhere. | |
3784 | */ | |
0f420358 | 3785 | if (rdev->data_offset < rdev->sb_start) { |
f0d76d70 N |
3786 | if (mddev->size && |
3787 | rdev->data_offset + mddev->size*2 | |
0f420358 | 3788 | > rdev->sb_start) { |
f0d76d70 N |
3789 | printk("md: %s: data overlaps metadata\n", |
3790 | mdname(mddev)); | |
3791 | return -EINVAL; | |
3792 | } | |
3793 | } else { | |
0f420358 | 3794 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
3795 | > rdev->data_offset) { |
3796 | printk("md: %s: metadata overlaps data\n", | |
3797 | mdname(mddev)); | |
3798 | return -EINVAL; | |
3799 | } | |
3800 | } | |
3c0ee63a | 3801 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
3802 | } |
3803 | ||
3804 | md_probe(mddev->unit, NULL, NULL); | |
3805 | disk = mddev->gendisk; | |
3806 | if (!disk) | |
3807 | return -ENOMEM; | |
3808 | ||
3809 | spin_lock(&pers_lock); | |
d9d166c2 | 3810 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3811 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3812 | spin_unlock(&pers_lock); |
d9d166c2 N |
3813 | if (mddev->level != LEVEL_NONE) |
3814 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3815 | mddev->level); | |
3816 | else | |
3817 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3818 | mddev->clevel); | |
1da177e4 LT |
3819 | return -EINVAL; |
3820 | } | |
2604b703 | 3821 | mddev->pers = pers; |
1da177e4 | 3822 | spin_unlock(&pers_lock); |
d9d166c2 N |
3823 | mddev->level = pers->level; |
3824 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3825 | |
3f9d99c1 MP |
3826 | if (pers->level >= 4 && pers->level <= 6) |
3827 | /* Cannot support integrity (yet) */ | |
3828 | blk_integrity_unregister(mddev->gendisk); | |
3829 | ||
f6705578 | 3830 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3831 | pers->start_reshape == NULL) { |
f6705578 N |
3832 | /* This personality cannot handle reshaping... */ |
3833 | mddev->pers = NULL; | |
3834 | module_put(pers->owner); | |
3835 | return -EINVAL; | |
3836 | } | |
3837 | ||
7dd5e7c3 N |
3838 | if (pers->sync_request) { |
3839 | /* Warn if this is a potentially silly | |
3840 | * configuration. | |
3841 | */ | |
3842 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3843 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 3844 | int warned = 0; |
159ec1fc CR |
3845 | |
3846 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
3847 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
3848 | if (rdev < rdev2 && |
3849 | rdev->bdev->bd_contains == | |
3850 | rdev2->bdev->bd_contains) { | |
3851 | printk(KERN_WARNING | |
3852 | "%s: WARNING: %s appears to be" | |
3853 | " on the same physical disk as" | |
3854 | " %s.\n", | |
3855 | mdname(mddev), | |
3856 | bdevname(rdev->bdev,b), | |
3857 | bdevname(rdev2->bdev,b2)); | |
3858 | warned = 1; | |
3859 | } | |
3860 | } | |
159ec1fc | 3861 | |
7dd5e7c3 N |
3862 | if (warned) |
3863 | printk(KERN_WARNING | |
3864 | "True protection against single-disk" | |
3865 | " failure might be compromised.\n"); | |
3866 | } | |
3867 | ||
657390d2 | 3868 | mddev->recovery = 0; |
1da177e4 | 3869 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3870 | mddev->barriers_work = 1; |
6ff8d8ec | 3871 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3872 | |
f91de92e N |
3873 | if (start_readonly) |
3874 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3875 | ||
b15c2e57 | 3876 | err = mddev->pers->run(mddev); |
13e53df3 AN |
3877 | if (err) |
3878 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3879 | else if (mddev->pers->sync_request) { | |
b15c2e57 N |
3880 | err = bitmap_create(mddev); |
3881 | if (err) { | |
3882 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3883 | mdname(mddev), err); | |
3884 | mddev->pers->stop(mddev); | |
3885 | } | |
3886 | } | |
1da177e4 | 3887 | if (err) { |
1da177e4 LT |
3888 | module_put(mddev->pers->owner); |
3889 | mddev->pers = NULL; | |
32a7627c N |
3890 | bitmap_destroy(mddev); |
3891 | return err; | |
1da177e4 | 3892 | } |
5e55e2f5 N |
3893 | if (mddev->pers->sync_request) { |
3894 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3895 | printk(KERN_WARNING | |
3896 | "md: cannot register extra attributes for %s\n", | |
3897 | mdname(mddev)); | |
0c3573f1 | 3898 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 3899 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
3900 | mddev->ro = 0; |
3901 | ||
1da177e4 LT |
3902 | atomic_set(&mddev->writes_pending,0); |
3903 | mddev->safemode = 0; | |
3904 | mddev->safemode_timer.function = md_safemode_timeout; | |
3905 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3906 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3907 | mddev->in_sync = 1; |
86e6ffdd | 3908 | |
159ec1fc | 3909 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
3910 | if (rdev->raid_disk >= 0) { |
3911 | char nm[20]; | |
3912 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3913 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3914 | printk("md: cannot register %s for %s\n", | |
3915 | nm, mdname(mddev)); | |
86e6ffdd | 3916 | } |
1da177e4 LT |
3917 | |
3918 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3919 | ||
850b2b42 N |
3920 | if (mddev->flags) |
3921 | md_update_sb(mddev, 0); | |
1da177e4 | 3922 | |
f233ea5c | 3923 | set_capacity(disk, mddev->array_sectors); |
1da177e4 LT |
3924 | |
3925 | /* If we call blk_queue_make_request here, it will | |
3926 | * re-initialise max_sectors etc which may have been | |
3927 | * refined inside -> run. So just set the bits we need to set. | |
3928 | * Most initialisation happended when we called | |
3929 | * blk_queue_make_request(..., md_fail_request) | |
3930 | * earlier. | |
3931 | */ | |
3932 | mddev->queue->queuedata = mddev; | |
3933 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3934 | ||
5fd6c1dc N |
3935 | /* If there is a partially-recovered drive we need to |
3936 | * start recovery here. If we leave it to md_check_recovery, | |
3937 | * it will remove the drives and not do the right thing | |
3938 | */ | |
0b8c9de0 | 3939 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 3940 | int spares = 0; |
159ec1fc | 3941 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
3942 | if (rdev->raid_disk >= 0 && |
3943 | !test_bit(In_sync, &rdev->flags) && | |
3944 | !test_bit(Faulty, &rdev->flags)) | |
3945 | /* complete an interrupted recovery */ | |
3946 | spares++; | |
3947 | if (spares && mddev->pers->sync_request) { | |
3948 | mddev->recovery = 0; | |
3949 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3950 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3951 | mddev, | |
3952 | "%s_resync"); | |
3953 | if (!mddev->sync_thread) { | |
3954 | printk(KERN_ERR "%s: could not start resync" | |
3955 | " thread...\n", | |
3956 | mdname(mddev)); | |
3957 | /* leave the spares where they are, it shouldn't hurt */ | |
3958 | mddev->recovery = 0; | |
0b8c9de0 | 3959 | } |
5fd6c1dc N |
3960 | } |
3961 | } | |
0b8c9de0 N |
3962 | md_wakeup_thread(mddev->thread); |
3963 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3964 | |
44ce6294 | 3965 | mddev->changed = 1; |
d7603b7e | 3966 | md_new_event(mddev); |
b62b7590 | 3967 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
3968 | if (mddev->sysfs_action) |
3969 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 3970 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 3971 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
3972 | return 0; |
3973 | } | |
3974 | ||
3975 | static int restart_array(mddev_t *mddev) | |
3976 | { | |
3977 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 3978 | |
80fab1d7 | 3979 | /* Complain if it has no devices */ |
1da177e4 | 3980 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
3981 | return -ENXIO; |
3982 | if (!mddev->pers) | |
3983 | return -EINVAL; | |
3984 | if (!mddev->ro) | |
3985 | return -EBUSY; | |
3986 | mddev->safemode = 0; | |
3987 | mddev->ro = 0; | |
3988 | set_disk_ro(disk, 0); | |
3989 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3990 | mdname(mddev)); | |
3991 | /* Kick recovery or resync if necessary */ | |
3992 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3993 | md_wakeup_thread(mddev->thread); | |
3994 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 3995 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 3996 | return 0; |
1da177e4 LT |
3997 | } |
3998 | ||
acc55e22 N |
3999 | /* similar to deny_write_access, but accounts for our holding a reference |
4000 | * to the file ourselves */ | |
4001 | static int deny_bitmap_write_access(struct file * file) | |
4002 | { | |
4003 | struct inode *inode = file->f_mapping->host; | |
4004 | ||
4005 | spin_lock(&inode->i_lock); | |
4006 | if (atomic_read(&inode->i_writecount) > 1) { | |
4007 | spin_unlock(&inode->i_lock); | |
4008 | return -ETXTBSY; | |
4009 | } | |
4010 | atomic_set(&inode->i_writecount, -1); | |
4011 | spin_unlock(&inode->i_lock); | |
4012 | ||
4013 | return 0; | |
4014 | } | |
4015 | ||
4016 | static void restore_bitmap_write_access(struct file *file) | |
4017 | { | |
4018 | struct inode *inode = file->f_mapping->host; | |
4019 | ||
4020 | spin_lock(&inode->i_lock); | |
4021 | atomic_set(&inode->i_writecount, 1); | |
4022 | spin_unlock(&inode->i_lock); | |
4023 | } | |
4024 | ||
9e653b63 N |
4025 | /* mode: |
4026 | * 0 - completely stop and dis-assemble array | |
4027 | * 1 - switch to readonly | |
4028 | * 2 - stop but do not disassemble array | |
4029 | */ | |
df5b20cf | 4030 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
4031 | { |
4032 | int err = 0; | |
4033 | struct gendisk *disk = mddev->gendisk; | |
4034 | ||
f2ea68cf | 4035 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf NB |
4036 | printk("md: %s still in use.\n",mdname(mddev)); |
4037 | return -EBUSY; | |
4038 | } | |
4039 | ||
1da177e4 | 4040 | if (mddev->pers) { |
1da177e4 LT |
4041 | |
4042 | if (mddev->sync_thread) { | |
5fd6c1dc | 4043 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
4044 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4045 | md_unregister_thread(mddev->sync_thread); | |
4046 | mddev->sync_thread = NULL; | |
4047 | } | |
4048 | ||
4049 | del_timer_sync(&mddev->safemode_timer); | |
4050 | ||
9e653b63 N |
4051 | switch(mode) { |
4052 | case 1: /* readonly */ | |
1da177e4 | 4053 | err = -ENXIO; |
f91de92e | 4054 | if (mddev->ro==1) |
1da177e4 LT |
4055 | goto out; |
4056 | mddev->ro = 1; | |
9e653b63 N |
4057 | break; |
4058 | case 0: /* disassemble */ | |
4059 | case 2: /* stop */ | |
6b8b3e8a | 4060 | bitmap_flush(mddev); |
a9701a30 | 4061 | md_super_wait(mddev); |
1da177e4 LT |
4062 | if (mddev->ro) |
4063 | set_disk_ro(disk, 0); | |
4064 | blk_queue_make_request(mddev->queue, md_fail_request); | |
4065 | mddev->pers->stop(mddev); | |
d1b5380c N |
4066 | mddev->queue->merge_bvec_fn = NULL; |
4067 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 4068 | mddev->queue->backing_dev_info.congested_fn = NULL; |
0c3573f1 | 4069 | if (mddev->pers->sync_request) { |
411036fa | 4070 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
0c3573f1 N |
4071 | if (mddev->sysfs_action) |
4072 | sysfs_put(mddev->sysfs_action); | |
4073 | mddev->sysfs_action = NULL; | |
4074 | } | |
1da177e4 LT |
4075 | module_put(mddev->pers->owner); |
4076 | mddev->pers = NULL; | |
4f54b0e9 | 4077 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 4078 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 N |
4079 | |
4080 | set_capacity(disk, 0); | |
44ce6294 | 4081 | mddev->changed = 1; |
0d4ca600 | 4082 | |
1da177e4 LT |
4083 | if (mddev->ro) |
4084 | mddev->ro = 0; | |
4085 | } | |
850b2b42 | 4086 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
4087 | /* mark array as shutdown cleanly */ |
4088 | mddev->in_sync = 1; | |
850b2b42 | 4089 | md_update_sb(mddev, 1); |
1da177e4 | 4090 | } |
9e653b63 | 4091 | if (mode == 1) |
1da177e4 | 4092 | set_disk_ro(disk, 1); |
5fd6c1dc | 4093 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 4094 | } |
32a7627c | 4095 | |
1da177e4 LT |
4096 | /* |
4097 | * Free resources if final stop | |
4098 | */ | |
9e653b63 | 4099 | if (mode == 0) { |
86e6ffdd | 4100 | mdk_rdev_t *rdev; |
0d4ca600 | 4101 | |
1da177e4 LT |
4102 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4103 | ||
978f946b N |
4104 | bitmap_destroy(mddev); |
4105 | if (mddev->bitmap_file) { | |
acc55e22 | 4106 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
4107 | fput(mddev->bitmap_file); |
4108 | mddev->bitmap_file = NULL; | |
4109 | } | |
4110 | mddev->bitmap_offset = 0; | |
4111 | ||
159ec1fc | 4112 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4113 | if (rdev->raid_disk >= 0) { |
4114 | char nm[20]; | |
4115 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4116 | sysfs_remove_link(&mddev->kobj, nm); | |
4117 | } | |
4118 | ||
177a99b2 | 4119 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
4120 | flush_scheduled_work(); |
4121 | ||
1da177e4 LT |
4122 | export_array(mddev); |
4123 | ||
f233ea5c | 4124 | mddev->array_sectors = 0; |
9e653b63 N |
4125 | mddev->size = 0; |
4126 | mddev->raid_disks = 0; | |
a94213b1 | 4127 | mddev->recovery_cp = 0; |
5e96ee65 | 4128 | mddev->resync_min = 0; |
c6207277 | 4129 | mddev->resync_max = MaxSector; |
08a02ecd | 4130 | mddev->reshape_position = MaxSector; |
e691063a | 4131 | mddev->external = 0; |
1ec4a939 | 4132 | mddev->persistent = 0; |
d897dbf9 N |
4133 | mddev->level = LEVEL_NONE; |
4134 | mddev->clevel[0] = 0; | |
4135 | mddev->flags = 0; | |
4136 | mddev->ro = 0; | |
4137 | mddev->metadata_type[0] = 0; | |
4138 | mddev->chunk_size = 0; | |
4139 | mddev->ctime = mddev->utime = 0; | |
4140 | mddev->layout = 0; | |
4141 | mddev->max_disks = 0; | |
4142 | mddev->events = 0; | |
4143 | mddev->delta_disks = 0; | |
4144 | mddev->new_level = LEVEL_NONE; | |
4145 | mddev->new_layout = 0; | |
4146 | mddev->new_chunk = 0; | |
4147 | mddev->curr_resync = 0; | |
4148 | mddev->resync_mismatches = 0; | |
4149 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4150 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4151 | mddev->recovery = 0; | |
4152 | mddev->in_sync = 0; | |
4153 | mddev->changed = 0; | |
4154 | mddev->degraded = 0; | |
4155 | mddev->barriers_work = 0; | |
4156 | mddev->safemode = 0; | |
934d9c23 | 4157 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4158 | if (mddev->hold_active == UNTIL_STOP) |
4159 | mddev->hold_active = 0; | |
9e653b63 | 4160 | |
a8a55c38 | 4161 | } else if (mddev->pers) |
1da177e4 LT |
4162 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4163 | mdname(mddev)); | |
4164 | err = 0; | |
3f9d99c1 | 4165 | blk_integrity_unregister(disk); |
d7603b7e | 4166 | md_new_event(mddev); |
b62b7590 | 4167 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4168 | out: |
4169 | return err; | |
4170 | } | |
4171 | ||
fdee8ae4 | 4172 | #ifndef MODULE |
1da177e4 LT |
4173 | static void autorun_array(mddev_t *mddev) |
4174 | { | |
4175 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4176 | int err; |
4177 | ||
a757e64c | 4178 | if (list_empty(&mddev->disks)) |
1da177e4 | 4179 | return; |
1da177e4 LT |
4180 | |
4181 | printk(KERN_INFO "md: running: "); | |
4182 | ||
159ec1fc | 4183 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4184 | char b[BDEVNAME_SIZE]; |
4185 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4186 | } | |
4187 | printk("\n"); | |
4188 | ||
d710e138 | 4189 | err = do_md_run(mddev); |
1da177e4 LT |
4190 | if (err) { |
4191 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4192 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4193 | } |
4194 | } | |
4195 | ||
4196 | /* | |
4197 | * lets try to run arrays based on all disks that have arrived | |
4198 | * until now. (those are in pending_raid_disks) | |
4199 | * | |
4200 | * the method: pick the first pending disk, collect all disks with | |
4201 | * the same UUID, remove all from the pending list and put them into | |
4202 | * the 'same_array' list. Then order this list based on superblock | |
4203 | * update time (freshest comes first), kick out 'old' disks and | |
4204 | * compare superblocks. If everything's fine then run it. | |
4205 | * | |
4206 | * If "unit" is allocated, then bump its reference count | |
4207 | */ | |
4208 | static void autorun_devices(int part) | |
4209 | { | |
159ec1fc | 4210 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4211 | mddev_t *mddev; |
4212 | char b[BDEVNAME_SIZE]; | |
4213 | ||
4214 | printk(KERN_INFO "md: autorun ...\n"); | |
4215 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4216 | int unit; |
1da177e4 | 4217 | dev_t dev; |
ad01c9e3 | 4218 | LIST_HEAD(candidates); |
1da177e4 LT |
4219 | rdev0 = list_entry(pending_raid_disks.next, |
4220 | mdk_rdev_t, same_set); | |
4221 | ||
4222 | printk(KERN_INFO "md: considering %s ...\n", | |
4223 | bdevname(rdev0->bdev,b)); | |
4224 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4225 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4226 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4227 | printk(KERN_INFO "md: adding %s ...\n", | |
4228 | bdevname(rdev->bdev,b)); | |
4229 | list_move(&rdev->same_set, &candidates); | |
4230 | } | |
4231 | /* | |
4232 | * now we have a set of devices, with all of them having | |
4233 | * mostly sane superblocks. It's time to allocate the | |
4234 | * mddev. | |
4235 | */ | |
e8703fe1 N |
4236 | if (part) { |
4237 | dev = MKDEV(mdp_major, | |
4238 | rdev0->preferred_minor << MdpMinorShift); | |
4239 | unit = MINOR(dev) >> MdpMinorShift; | |
4240 | } else { | |
4241 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4242 | unit = MINOR(dev); | |
4243 | } | |
4244 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4245 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4246 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4247 | break; | |
4248 | } | |
1da177e4 LT |
4249 | |
4250 | md_probe(dev, NULL, NULL); | |
4251 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4252 | if (!mddev || !mddev->gendisk) { |
4253 | if (mddev) | |
4254 | mddev_put(mddev); | |
4255 | printk(KERN_ERR | |
1da177e4 LT |
4256 | "md: cannot allocate memory for md drive.\n"); |
4257 | break; | |
4258 | } | |
4259 | if (mddev_lock(mddev)) | |
4260 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4261 | mdname(mddev)); | |
4262 | else if (mddev->raid_disks || mddev->major_version | |
4263 | || !list_empty(&mddev->disks)) { | |
4264 | printk(KERN_WARNING | |
4265 | "md: %s already running, cannot run %s\n", | |
4266 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4267 | mddev_unlock(mddev); | |
4268 | } else { | |
4269 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4270 | mddev->persistent = 1; |
159ec1fc | 4271 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4272 | list_del_init(&rdev->same_set); |
4273 | if (bind_rdev_to_array(rdev, mddev)) | |
4274 | export_rdev(rdev); | |
4275 | } | |
4276 | autorun_array(mddev); | |
4277 | mddev_unlock(mddev); | |
4278 | } | |
4279 | /* on success, candidates will be empty, on error | |
4280 | * it won't... | |
4281 | */ | |
159ec1fc | 4282 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4283 | list_del_init(&rdev->same_set); |
1da177e4 | 4284 | export_rdev(rdev); |
4b80991c | 4285 | } |
1da177e4 LT |
4286 | mddev_put(mddev); |
4287 | } | |
4288 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4289 | } | |
fdee8ae4 | 4290 | #endif /* !MODULE */ |
1da177e4 | 4291 | |
1da177e4 LT |
4292 | static int get_version(void __user * arg) |
4293 | { | |
4294 | mdu_version_t ver; | |
4295 | ||
4296 | ver.major = MD_MAJOR_VERSION; | |
4297 | ver.minor = MD_MINOR_VERSION; | |
4298 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4299 | ||
4300 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4301 | return -EFAULT; | |
4302 | ||
4303 | return 0; | |
4304 | } | |
4305 | ||
4306 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4307 | { | |
4308 | mdu_array_info_t info; | |
4309 | int nr,working,active,failed,spare; | |
4310 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4311 | |
4312 | nr=working=active=failed=spare=0; | |
159ec1fc | 4313 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4314 | nr++; |
b2d444d7 | 4315 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4316 | failed++; |
4317 | else { | |
4318 | working++; | |
b2d444d7 | 4319 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4320 | active++; |
4321 | else | |
4322 | spare++; | |
4323 | } | |
4324 | } | |
4325 | ||
4326 | info.major_version = mddev->major_version; | |
4327 | info.minor_version = mddev->minor_version; | |
4328 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4329 | info.ctime = mddev->ctime; | |
4330 | info.level = mddev->level; | |
4331 | info.size = mddev->size; | |
284ae7ca N |
4332 | if (info.size != mddev->size) /* overflow */ |
4333 | info.size = -1; | |
1da177e4 LT |
4334 | info.nr_disks = nr; |
4335 | info.raid_disks = mddev->raid_disks; | |
4336 | info.md_minor = mddev->md_minor; | |
4337 | info.not_persistent= !mddev->persistent; | |
4338 | ||
4339 | info.utime = mddev->utime; | |
4340 | info.state = 0; | |
4341 | if (mddev->in_sync) | |
4342 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4343 | if (mddev->bitmap && mddev->bitmap_offset) |
4344 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4345 | info.active_disks = active; |
4346 | info.working_disks = working; | |
4347 | info.failed_disks = failed; | |
4348 | info.spare_disks = spare; | |
4349 | ||
4350 | info.layout = mddev->layout; | |
4351 | info.chunk_size = mddev->chunk_size; | |
4352 | ||
4353 | if (copy_to_user(arg, &info, sizeof(info))) | |
4354 | return -EFAULT; | |
4355 | ||
4356 | return 0; | |
4357 | } | |
4358 | ||
87162a28 | 4359 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4360 | { |
4361 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4362 | char *ptr, *buf = NULL; | |
4363 | int err = -ENOMEM; | |
4364 | ||
b5470dc5 DW |
4365 | if (md_allow_write(mddev)) |
4366 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4367 | else | |
4368 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4369 | |
32a7627c N |
4370 | if (!file) |
4371 | goto out; | |
4372 | ||
4373 | /* bitmap disabled, zero the first byte and copy out */ | |
4374 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4375 | file->pathname[0] = '\0'; | |
4376 | goto copy_out; | |
4377 | } | |
4378 | ||
4379 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4380 | if (!buf) | |
4381 | goto out; | |
4382 | ||
6bcfd601 CH |
4383 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4384 | if (IS_ERR(ptr)) | |
32a7627c N |
4385 | goto out; |
4386 | ||
4387 | strcpy(file->pathname, ptr); | |
4388 | ||
4389 | copy_out: | |
4390 | err = 0; | |
4391 | if (copy_to_user(arg, file, sizeof(*file))) | |
4392 | err = -EFAULT; | |
4393 | out: | |
4394 | kfree(buf); | |
4395 | kfree(file); | |
4396 | return err; | |
4397 | } | |
4398 | ||
1da177e4 LT |
4399 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4400 | { | |
4401 | mdu_disk_info_t info; | |
1da177e4 LT |
4402 | mdk_rdev_t *rdev; |
4403 | ||
4404 | if (copy_from_user(&info, arg, sizeof(info))) | |
4405 | return -EFAULT; | |
4406 | ||
26ef379f | 4407 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4408 | if (rdev) { |
4409 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4410 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4411 | info.raid_disk = rdev->raid_disk; | |
4412 | info.state = 0; | |
b2d444d7 | 4413 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4414 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4415 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4416 | info.state |= (1<<MD_DISK_ACTIVE); |
4417 | info.state |= (1<<MD_DISK_SYNC); | |
4418 | } | |
8ddf9efe N |
4419 | if (test_bit(WriteMostly, &rdev->flags)) |
4420 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4421 | } else { |
4422 | info.major = info.minor = 0; | |
4423 | info.raid_disk = -1; | |
4424 | info.state = (1<<MD_DISK_REMOVED); | |
4425 | } | |
4426 | ||
4427 | if (copy_to_user(arg, &info, sizeof(info))) | |
4428 | return -EFAULT; | |
4429 | ||
4430 | return 0; | |
4431 | } | |
4432 | ||
4433 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4434 | { | |
4435 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4436 | mdk_rdev_t *rdev; | |
4437 | dev_t dev = MKDEV(info->major,info->minor); | |
4438 | ||
4439 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4440 | return -EOVERFLOW; | |
4441 | ||
4442 | if (!mddev->raid_disks) { | |
4443 | int err; | |
4444 | /* expecting a device which has a superblock */ | |
4445 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4446 | if (IS_ERR(rdev)) { | |
4447 | printk(KERN_WARNING | |
4448 | "md: md_import_device returned %ld\n", | |
4449 | PTR_ERR(rdev)); | |
4450 | return PTR_ERR(rdev); | |
4451 | } | |
4452 | if (!list_empty(&mddev->disks)) { | |
4453 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4454 | mdk_rdev_t, same_set); | |
4455 | int err = super_types[mddev->major_version] | |
4456 | .load_super(rdev, rdev0, mddev->minor_version); | |
4457 | if (err < 0) { | |
4458 | printk(KERN_WARNING | |
4459 | "md: %s has different UUID to %s\n", | |
4460 | bdevname(rdev->bdev,b), | |
4461 | bdevname(rdev0->bdev,b2)); | |
4462 | export_rdev(rdev); | |
4463 | return -EINVAL; | |
4464 | } | |
4465 | } | |
4466 | err = bind_rdev_to_array(rdev, mddev); | |
4467 | if (err) | |
4468 | export_rdev(rdev); | |
4469 | return err; | |
4470 | } | |
4471 | ||
4472 | /* | |
4473 | * add_new_disk can be used once the array is assembled | |
4474 | * to add "hot spares". They must already have a superblock | |
4475 | * written | |
4476 | */ | |
4477 | if (mddev->pers) { | |
4478 | int err; | |
4479 | if (!mddev->pers->hot_add_disk) { | |
4480 | printk(KERN_WARNING | |
4481 | "%s: personality does not support diskops!\n", | |
4482 | mdname(mddev)); | |
4483 | return -EINVAL; | |
4484 | } | |
7b1e35f6 N |
4485 | if (mddev->persistent) |
4486 | rdev = md_import_device(dev, mddev->major_version, | |
4487 | mddev->minor_version); | |
4488 | else | |
4489 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4490 | if (IS_ERR(rdev)) { |
4491 | printk(KERN_WARNING | |
4492 | "md: md_import_device returned %ld\n", | |
4493 | PTR_ERR(rdev)); | |
4494 | return PTR_ERR(rdev); | |
4495 | } | |
41158c7e N |
4496 | /* set save_raid_disk if appropriate */ |
4497 | if (!mddev->persistent) { | |
4498 | if (info->state & (1<<MD_DISK_SYNC) && | |
4499 | info->raid_disk < mddev->raid_disks) | |
4500 | rdev->raid_disk = info->raid_disk; | |
4501 | else | |
4502 | rdev->raid_disk = -1; | |
4503 | } else | |
4504 | super_types[mddev->major_version]. | |
4505 | validate_super(mddev, rdev); | |
4506 | rdev->saved_raid_disk = rdev->raid_disk; | |
4507 | ||
b2d444d7 | 4508 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4509 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4510 | set_bit(WriteMostly, &rdev->flags); | |
4511 | ||
1da177e4 LT |
4512 | rdev->raid_disk = -1; |
4513 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4514 | if (!err && !mddev->pers->hot_remove_disk) { |
4515 | /* If there is hot_add_disk but no hot_remove_disk | |
4516 | * then added disks for geometry changes, | |
4517 | * and should be added immediately. | |
4518 | */ | |
4519 | super_types[mddev->major_version]. | |
4520 | validate_super(mddev, rdev); | |
4521 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4522 | if (err) | |
4523 | unbind_rdev_from_array(rdev); | |
4524 | } | |
1da177e4 LT |
4525 | if (err) |
4526 | export_rdev(rdev); | |
52664732 | 4527 | else |
3c0ee63a | 4528 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4529 | |
17571284 | 4530 | md_update_sb(mddev, 1); |
72a23c21 NB |
4531 | if (mddev->degraded) |
4532 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4533 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4534 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4535 | return err; |
4536 | } | |
4537 | ||
4538 | /* otherwise, add_new_disk is only allowed | |
4539 | * for major_version==0 superblocks | |
4540 | */ | |
4541 | if (mddev->major_version != 0) { | |
4542 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4543 | mdname(mddev)); | |
4544 | return -EINVAL; | |
4545 | } | |
4546 | ||
4547 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4548 | int err; | |
d710e138 | 4549 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4550 | if (IS_ERR(rdev)) { |
4551 | printk(KERN_WARNING | |
4552 | "md: error, md_import_device() returned %ld\n", | |
4553 | PTR_ERR(rdev)); | |
4554 | return PTR_ERR(rdev); | |
4555 | } | |
4556 | rdev->desc_nr = info->number; | |
4557 | if (info->raid_disk < mddev->raid_disks) | |
4558 | rdev->raid_disk = info->raid_disk; | |
4559 | else | |
4560 | rdev->raid_disk = -1; | |
4561 | ||
1da177e4 | 4562 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4563 | if (info->state & (1<<MD_DISK_SYNC)) |
4564 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4565 | |
8ddf9efe N |
4566 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4567 | set_bit(WriteMostly, &rdev->flags); | |
4568 | ||
1da177e4 LT |
4569 | if (!mddev->persistent) { |
4570 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4571 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4572 | } else |
0f420358 | 4573 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
e7debaa4 | 4574 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4575 | |
2bf071bf N |
4576 | err = bind_rdev_to_array(rdev, mddev); |
4577 | if (err) { | |
4578 | export_rdev(rdev); | |
4579 | return err; | |
4580 | } | |
1da177e4 LT |
4581 | } |
4582 | ||
4583 | return 0; | |
4584 | } | |
4585 | ||
4586 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4587 | { | |
4588 | char b[BDEVNAME_SIZE]; | |
4589 | mdk_rdev_t *rdev; | |
4590 | ||
1da177e4 LT |
4591 | rdev = find_rdev(mddev, dev); |
4592 | if (!rdev) | |
4593 | return -ENXIO; | |
4594 | ||
4595 | if (rdev->raid_disk >= 0) | |
4596 | goto busy; | |
4597 | ||
4598 | kick_rdev_from_array(rdev); | |
850b2b42 | 4599 | md_update_sb(mddev, 1); |
d7603b7e | 4600 | md_new_event(mddev); |
1da177e4 LT |
4601 | |
4602 | return 0; | |
4603 | busy: | |
fdefa4d8 | 4604 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4605 | bdevname(rdev->bdev,b), mdname(mddev)); |
4606 | return -EBUSY; | |
4607 | } | |
4608 | ||
4609 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4610 | { | |
4611 | char b[BDEVNAME_SIZE]; | |
4612 | int err; | |
1da177e4 LT |
4613 | mdk_rdev_t *rdev; |
4614 | ||
4615 | if (!mddev->pers) | |
4616 | return -ENODEV; | |
4617 | ||
4618 | if (mddev->major_version != 0) { | |
4619 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4620 | " version-0 superblocks.\n", | |
4621 | mdname(mddev)); | |
4622 | return -EINVAL; | |
4623 | } | |
4624 | if (!mddev->pers->hot_add_disk) { | |
4625 | printk(KERN_WARNING | |
4626 | "%s: personality does not support diskops!\n", | |
4627 | mdname(mddev)); | |
4628 | return -EINVAL; | |
4629 | } | |
4630 | ||
d710e138 | 4631 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4632 | if (IS_ERR(rdev)) { |
4633 | printk(KERN_WARNING | |
4634 | "md: error, md_import_device() returned %ld\n", | |
4635 | PTR_ERR(rdev)); | |
4636 | return -EINVAL; | |
4637 | } | |
4638 | ||
4639 | if (mddev->persistent) | |
0f420358 | 4640 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4641 | else |
0f420358 | 4642 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4643 | |
e7debaa4 | 4644 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4645 | |
b2d444d7 | 4646 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4647 | printk(KERN_WARNING |
4648 | "md: can not hot-add faulty %s disk to %s!\n", | |
4649 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4650 | err = -EINVAL; | |
4651 | goto abort_export; | |
4652 | } | |
b2d444d7 | 4653 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4654 | rdev->desc_nr = -1; |
5842730d | 4655 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4656 | err = bind_rdev_to_array(rdev, mddev); |
4657 | if (err) | |
4658 | goto abort_export; | |
1da177e4 LT |
4659 | |
4660 | /* | |
4661 | * The rest should better be atomic, we can have disk failures | |
4662 | * noticed in interrupt contexts ... | |
4663 | */ | |
4664 | ||
1da177e4 LT |
4665 | rdev->raid_disk = -1; |
4666 | ||
850b2b42 | 4667 | md_update_sb(mddev, 1); |
1da177e4 LT |
4668 | |
4669 | /* | |
4670 | * Kick recovery, maybe this spare has to be added to the | |
4671 | * array immediately. | |
4672 | */ | |
4673 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4674 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4675 | md_new_event(mddev); |
1da177e4 LT |
4676 | return 0; |
4677 | ||
1da177e4 LT |
4678 | abort_export: |
4679 | export_rdev(rdev); | |
4680 | return err; | |
4681 | } | |
4682 | ||
32a7627c N |
4683 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4684 | { | |
4685 | int err; | |
4686 | ||
36fa3063 N |
4687 | if (mddev->pers) { |
4688 | if (!mddev->pers->quiesce) | |
4689 | return -EBUSY; | |
4690 | if (mddev->recovery || mddev->sync_thread) | |
4691 | return -EBUSY; | |
4692 | /* we should be able to change the bitmap.. */ | |
4693 | } | |
32a7627c | 4694 | |
32a7627c | 4695 | |
36fa3063 N |
4696 | if (fd >= 0) { |
4697 | if (mddev->bitmap) | |
4698 | return -EEXIST; /* cannot add when bitmap is present */ | |
4699 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4700 | |
36fa3063 N |
4701 | if (mddev->bitmap_file == NULL) { |
4702 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4703 | mdname(mddev)); | |
4704 | return -EBADF; | |
4705 | } | |
4706 | ||
4707 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4708 | if (err) { | |
4709 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4710 | mdname(mddev)); | |
4711 | fput(mddev->bitmap_file); | |
4712 | mddev->bitmap_file = NULL; | |
4713 | return err; | |
4714 | } | |
a654b9d8 | 4715 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4716 | } else if (mddev->bitmap == NULL) |
4717 | return -ENOENT; /* cannot remove what isn't there */ | |
4718 | err = 0; | |
4719 | if (mddev->pers) { | |
4720 | mddev->pers->quiesce(mddev, 1); | |
4721 | if (fd >= 0) | |
4722 | err = bitmap_create(mddev); | |
d7375ab3 | 4723 | if (fd < 0 || err) { |
36fa3063 | 4724 | bitmap_destroy(mddev); |
d7375ab3 N |
4725 | fd = -1; /* make sure to put the file */ |
4726 | } | |
36fa3063 | 4727 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4728 | } |
4729 | if (fd < 0) { | |
acc55e22 N |
4730 | if (mddev->bitmap_file) { |
4731 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4732 | fput(mddev->bitmap_file); |
acc55e22 | 4733 | } |
36fa3063 N |
4734 | mddev->bitmap_file = NULL; |
4735 | } | |
4736 | ||
32a7627c N |
4737 | return err; |
4738 | } | |
4739 | ||
1da177e4 LT |
4740 | /* |
4741 | * set_array_info is used two different ways | |
4742 | * The original usage is when creating a new array. | |
4743 | * In this usage, raid_disks is > 0 and it together with | |
4744 | * level, size, not_persistent,layout,chunksize determine the | |
4745 | * shape of the array. | |
4746 | * This will always create an array with a type-0.90.0 superblock. | |
4747 | * The newer usage is when assembling an array. | |
4748 | * In this case raid_disks will be 0, and the major_version field is | |
4749 | * use to determine which style super-blocks are to be found on the devices. | |
4750 | * The minor and patch _version numbers are also kept incase the | |
4751 | * super_block handler wishes to interpret them. | |
4752 | */ | |
4753 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4754 | { | |
4755 | ||
4756 | if (info->raid_disks == 0) { | |
4757 | /* just setting version number for superblock loading */ | |
4758 | if (info->major_version < 0 || | |
50511da3 | 4759 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4760 | super_types[info->major_version].name == NULL) { |
4761 | /* maybe try to auto-load a module? */ | |
4762 | printk(KERN_INFO | |
4763 | "md: superblock version %d not known\n", | |
4764 | info->major_version); | |
4765 | return -EINVAL; | |
4766 | } | |
4767 | mddev->major_version = info->major_version; | |
4768 | mddev->minor_version = info->minor_version; | |
4769 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4770 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4771 | return 0; |
4772 | } | |
4773 | mddev->major_version = MD_MAJOR_VERSION; | |
4774 | mddev->minor_version = MD_MINOR_VERSION; | |
4775 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4776 | mddev->ctime = get_seconds(); | |
4777 | ||
4778 | mddev->level = info->level; | |
17115e03 | 4779 | mddev->clevel[0] = 0; |
1da177e4 LT |
4780 | mddev->size = info->size; |
4781 | mddev->raid_disks = info->raid_disks; | |
4782 | /* don't set md_minor, it is determined by which /dev/md* was | |
4783 | * openned | |
4784 | */ | |
4785 | if (info->state & (1<<MD_SB_CLEAN)) | |
4786 | mddev->recovery_cp = MaxSector; | |
4787 | else | |
4788 | mddev->recovery_cp = 0; | |
4789 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4790 | mddev->external = 0; |
1da177e4 LT |
4791 | |
4792 | mddev->layout = info->layout; | |
4793 | mddev->chunk_size = info->chunk_size; | |
4794 | ||
4795 | mddev->max_disks = MD_SB_DISKS; | |
4796 | ||
e691063a N |
4797 | if (mddev->persistent) |
4798 | mddev->flags = 0; | |
850b2b42 | 4799 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4800 | |
b2a2703c N |
4801 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4802 | mddev->bitmap_offset = 0; | |
4803 | ||
f6705578 N |
4804 | mddev->reshape_position = MaxSector; |
4805 | ||
1da177e4 LT |
4806 | /* |
4807 | * Generate a 128 bit UUID | |
4808 | */ | |
4809 | get_random_bytes(mddev->uuid, 16); | |
4810 | ||
f6705578 N |
4811 | mddev->new_level = mddev->level; |
4812 | mddev->new_chunk = mddev->chunk_size; | |
4813 | mddev->new_layout = mddev->layout; | |
4814 | mddev->delta_disks = 0; | |
4815 | ||
1da177e4 LT |
4816 | return 0; |
4817 | } | |
4818 | ||
d71f9f88 | 4819 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 4820 | { |
159ec1fc | 4821 | mdk_rdev_t *rdev; |
a35b0d69 | 4822 | int rv; |
d71f9f88 | 4823 | int fit = (num_sectors == 0); |
a35b0d69 N |
4824 | |
4825 | if (mddev->pers->resize == NULL) | |
4826 | return -EINVAL; | |
d71f9f88 AN |
4827 | /* The "num_sectors" is the number of sectors of each device that |
4828 | * is used. This can only make sense for arrays with redundancy. | |
4829 | * linear and raid0 always use whatever space is available. We can only | |
4830 | * consider changing this number if no resync or reconstruction is | |
4831 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 4832 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
4833 | * of each device. If num_sectors is zero, we find the largest size |
4834 | * that fits. | |
4835 | ||
a35b0d69 N |
4836 | */ |
4837 | if (mddev->sync_thread) | |
4838 | return -EBUSY; | |
dba034ee N |
4839 | if (mddev->bitmap) |
4840 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
4841 | * grow, and re-add. | |
4842 | */ | |
4843 | return -EBUSY; | |
159ec1fc | 4844 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
a35b0d69 | 4845 | sector_t avail; |
01ab5662 N |
4846 | avail = rdev->size * 2; |
4847 | ||
d71f9f88 AN |
4848 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
4849 | num_sectors = avail; | |
4850 | if (avail < num_sectors) | |
a35b0d69 N |
4851 | return -ENOSPC; |
4852 | } | |
d71f9f88 | 4853 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
4854 | if (!rv) { |
4855 | struct block_device *bdev; | |
4856 | ||
4857 | bdev = bdget_disk(mddev->gendisk, 0); | |
4858 | if (bdev) { | |
1b1dcc1b | 4859 | mutex_lock(&bdev->bd_inode->i_mutex); |
f233ea5c AN |
4860 | i_size_write(bdev->bd_inode, |
4861 | (loff_t)mddev->array_sectors << 9); | |
1b1dcc1b | 4862 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4863 | bdput(bdev); |
4864 | } | |
4865 | } | |
4866 | return rv; | |
4867 | } | |
4868 | ||
da943b99 N |
4869 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4870 | { | |
4871 | int rv; | |
4872 | /* change the number of raid disks */ | |
63c70c4f | 4873 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4874 | return -EINVAL; |
4875 | if (raid_disks <= 0 || | |
4876 | raid_disks >= mddev->max_disks) | |
4877 | return -EINVAL; | |
63c70c4f | 4878 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4879 | return -EBUSY; |
63c70c4f N |
4880 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4881 | ||
4882 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4883 | return rv; |
4884 | } | |
4885 | ||
4886 | ||
1da177e4 LT |
4887 | /* |
4888 | * update_array_info is used to change the configuration of an | |
4889 | * on-line array. | |
4890 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4891 | * fields in the info are checked against the array. | |
4892 | * Any differences that cannot be handled will cause an error. | |
4893 | * Normally, only one change can be managed at a time. | |
4894 | */ | |
4895 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4896 | { | |
4897 | int rv = 0; | |
4898 | int cnt = 0; | |
36fa3063 N |
4899 | int state = 0; |
4900 | ||
4901 | /* calculate expected state,ignoring low bits */ | |
4902 | if (mddev->bitmap && mddev->bitmap_offset) | |
4903 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4904 | |
4905 | if (mddev->major_version != info->major_version || | |
4906 | mddev->minor_version != info->minor_version || | |
4907 | /* mddev->patch_version != info->patch_version || */ | |
4908 | mddev->ctime != info->ctime || | |
4909 | mddev->level != info->level || | |
4910 | /* mddev->layout != info->layout || */ | |
4911 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4912 | mddev->chunk_size != info->chunk_size || |
4913 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4914 | ((state^info->state) & 0xfffffe00) | |
4915 | ) | |
1da177e4 LT |
4916 | return -EINVAL; |
4917 | /* Check there is only one change */ | |
284ae7ca | 4918 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4919 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4920 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4921 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4922 | if (cnt == 0) return 0; |
4923 | if (cnt > 1) return -EINVAL; | |
4924 | ||
4925 | if (mddev->layout != info->layout) { | |
4926 | /* Change layout | |
4927 | * we don't need to do anything at the md level, the | |
4928 | * personality will take care of it all. | |
4929 | */ | |
4930 | if (mddev->pers->reconfig == NULL) | |
4931 | return -EINVAL; | |
4932 | else | |
4933 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4934 | } | |
284ae7ca | 4935 | if (info->size >= 0 && mddev->size != info->size) |
d71f9f88 | 4936 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 4937 | |
da943b99 N |
4938 | if (mddev->raid_disks != info->raid_disks) |
4939 | rv = update_raid_disks(mddev, info->raid_disks); | |
4940 | ||
36fa3063 N |
4941 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4942 | if (mddev->pers->quiesce == NULL) | |
4943 | return -EINVAL; | |
4944 | if (mddev->recovery || mddev->sync_thread) | |
4945 | return -EBUSY; | |
4946 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4947 | /* add the bitmap */ | |
4948 | if (mddev->bitmap) | |
4949 | return -EEXIST; | |
4950 | if (mddev->default_bitmap_offset == 0) | |
4951 | return -EINVAL; | |
4952 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4953 | mddev->pers->quiesce(mddev, 1); | |
4954 | rv = bitmap_create(mddev); | |
4955 | if (rv) | |
4956 | bitmap_destroy(mddev); | |
4957 | mddev->pers->quiesce(mddev, 0); | |
4958 | } else { | |
4959 | /* remove the bitmap */ | |
4960 | if (!mddev->bitmap) | |
4961 | return -ENOENT; | |
4962 | if (mddev->bitmap->file) | |
4963 | return -EINVAL; | |
4964 | mddev->pers->quiesce(mddev, 1); | |
4965 | bitmap_destroy(mddev); | |
4966 | mddev->pers->quiesce(mddev, 0); | |
4967 | mddev->bitmap_offset = 0; | |
4968 | } | |
4969 | } | |
850b2b42 | 4970 | md_update_sb(mddev, 1); |
1da177e4 LT |
4971 | return rv; |
4972 | } | |
4973 | ||
4974 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4975 | { | |
4976 | mdk_rdev_t *rdev; | |
4977 | ||
4978 | if (mddev->pers == NULL) | |
4979 | return -ENODEV; | |
4980 | ||
4981 | rdev = find_rdev(mddev, dev); | |
4982 | if (!rdev) | |
4983 | return -ENODEV; | |
4984 | ||
4985 | md_error(mddev, rdev); | |
4986 | return 0; | |
4987 | } | |
4988 | ||
2f9618ce AN |
4989 | /* |
4990 | * We have a problem here : there is no easy way to give a CHS | |
4991 | * virtual geometry. We currently pretend that we have a 2 heads | |
4992 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4993 | * dosfs just mad... ;-) | |
4994 | */ | |
a885c8c4 CH |
4995 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4996 | { | |
4997 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4998 | ||
4999 | geo->heads = 2; | |
5000 | geo->sectors = 4; | |
5001 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
5002 | return 0; | |
5003 | } | |
5004 | ||
a39907fa | 5005 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5006 | unsigned int cmd, unsigned long arg) |
5007 | { | |
5008 | int err = 0; | |
5009 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
5010 | mddev_t *mddev = NULL; |
5011 | ||
5012 | if (!capable(CAP_SYS_ADMIN)) | |
5013 | return -EACCES; | |
5014 | ||
5015 | /* | |
5016 | * Commands dealing with the RAID driver but not any | |
5017 | * particular array: | |
5018 | */ | |
5019 | switch (cmd) | |
5020 | { | |
5021 | case RAID_VERSION: | |
5022 | err = get_version(argp); | |
5023 | goto done; | |
5024 | ||
5025 | case PRINT_RAID_DEBUG: | |
5026 | err = 0; | |
5027 | md_print_devices(); | |
5028 | goto done; | |
5029 | ||
5030 | #ifndef MODULE | |
5031 | case RAID_AUTORUN: | |
5032 | err = 0; | |
5033 | autostart_arrays(arg); | |
5034 | goto done; | |
5035 | #endif | |
5036 | default:; | |
5037 | } | |
5038 | ||
5039 | /* | |
5040 | * Commands creating/starting a new array: | |
5041 | */ | |
5042 | ||
a39907fa | 5043 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5044 | |
5045 | if (!mddev) { | |
5046 | BUG(); | |
5047 | goto abort; | |
5048 | } | |
5049 | ||
1da177e4 LT |
5050 | err = mddev_lock(mddev); |
5051 | if (err) { | |
5052 | printk(KERN_INFO | |
5053 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5054 | err, cmd); | |
5055 | goto abort; | |
5056 | } | |
5057 | ||
5058 | switch (cmd) | |
5059 | { | |
5060 | case SET_ARRAY_INFO: | |
5061 | { | |
5062 | mdu_array_info_t info; | |
5063 | if (!arg) | |
5064 | memset(&info, 0, sizeof(info)); | |
5065 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5066 | err = -EFAULT; | |
5067 | goto abort_unlock; | |
5068 | } | |
5069 | if (mddev->pers) { | |
5070 | err = update_array_info(mddev, &info); | |
5071 | if (err) { | |
5072 | printk(KERN_WARNING "md: couldn't update" | |
5073 | " array info. %d\n", err); | |
5074 | goto abort_unlock; | |
5075 | } | |
5076 | goto done_unlock; | |
5077 | } | |
5078 | if (!list_empty(&mddev->disks)) { | |
5079 | printk(KERN_WARNING | |
5080 | "md: array %s already has disks!\n", | |
5081 | mdname(mddev)); | |
5082 | err = -EBUSY; | |
5083 | goto abort_unlock; | |
5084 | } | |
5085 | if (mddev->raid_disks) { | |
5086 | printk(KERN_WARNING | |
5087 | "md: array %s already initialised!\n", | |
5088 | mdname(mddev)); | |
5089 | err = -EBUSY; | |
5090 | goto abort_unlock; | |
5091 | } | |
5092 | err = set_array_info(mddev, &info); | |
5093 | if (err) { | |
5094 | printk(KERN_WARNING "md: couldn't set" | |
5095 | " array info. %d\n", err); | |
5096 | goto abort_unlock; | |
5097 | } | |
5098 | } | |
5099 | goto done_unlock; | |
5100 | ||
5101 | default:; | |
5102 | } | |
5103 | ||
5104 | /* | |
5105 | * Commands querying/configuring an existing array: | |
5106 | */ | |
32a7627c | 5107 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5108 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5109 | if ((!mddev->raid_disks && !mddev->external) |
5110 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5111 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5112 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5113 | err = -ENODEV; |
5114 | goto abort_unlock; | |
5115 | } | |
5116 | ||
5117 | /* | |
5118 | * Commands even a read-only array can execute: | |
5119 | */ | |
5120 | switch (cmd) | |
5121 | { | |
5122 | case GET_ARRAY_INFO: | |
5123 | err = get_array_info(mddev, argp); | |
5124 | goto done_unlock; | |
5125 | ||
32a7627c | 5126 | case GET_BITMAP_FILE: |
87162a28 | 5127 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5128 | goto done_unlock; |
5129 | ||
1da177e4 LT |
5130 | case GET_DISK_INFO: |
5131 | err = get_disk_info(mddev, argp); | |
5132 | goto done_unlock; | |
5133 | ||
5134 | case RESTART_ARRAY_RW: | |
5135 | err = restart_array(mddev); | |
5136 | goto done_unlock; | |
5137 | ||
5138 | case STOP_ARRAY: | |
d710e138 | 5139 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5140 | goto done_unlock; |
5141 | ||
5142 | case STOP_ARRAY_RO: | |
d710e138 | 5143 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
5144 | goto done_unlock; |
5145 | ||
1da177e4 LT |
5146 | } |
5147 | ||
5148 | /* | |
5149 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5150 | * superblock, so we do not allow them on read-only arrays. |
5151 | * However non-MD ioctls (e.g. get-size) will still come through | |
5152 | * here and hit the 'default' below, so only disallow | |
5153 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5154 | */ |
bb57fc64 | 5155 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5156 | if (mddev->ro == 2) { |
5157 | mddev->ro = 0; | |
b62b7590 | 5158 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5159 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5160 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5161 | } else { |
5162 | err = -EROFS; | |
5163 | goto abort_unlock; | |
5164 | } | |
1da177e4 LT |
5165 | } |
5166 | ||
5167 | switch (cmd) | |
5168 | { | |
5169 | case ADD_NEW_DISK: | |
5170 | { | |
5171 | mdu_disk_info_t info; | |
5172 | if (copy_from_user(&info, argp, sizeof(info))) | |
5173 | err = -EFAULT; | |
5174 | else | |
5175 | err = add_new_disk(mddev, &info); | |
5176 | goto done_unlock; | |
5177 | } | |
5178 | ||
5179 | case HOT_REMOVE_DISK: | |
5180 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5181 | goto done_unlock; | |
5182 | ||
5183 | case HOT_ADD_DISK: | |
5184 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5185 | goto done_unlock; | |
5186 | ||
5187 | case SET_DISK_FAULTY: | |
5188 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5189 | goto done_unlock; | |
5190 | ||
5191 | case RUN_ARRAY: | |
d710e138 | 5192 | err = do_md_run(mddev); |
1da177e4 LT |
5193 | goto done_unlock; |
5194 | ||
32a7627c N |
5195 | case SET_BITMAP_FILE: |
5196 | err = set_bitmap_file(mddev, (int)arg); | |
5197 | goto done_unlock; | |
5198 | ||
1da177e4 | 5199 | default: |
1da177e4 LT |
5200 | err = -EINVAL; |
5201 | goto abort_unlock; | |
5202 | } | |
5203 | ||
5204 | done_unlock: | |
5205 | abort_unlock: | |
d3374825 N |
5206 | if (mddev->hold_active == UNTIL_IOCTL && |
5207 | err != -EINVAL) | |
5208 | mddev->hold_active = 0; | |
1da177e4 LT |
5209 | mddev_unlock(mddev); |
5210 | ||
5211 | return err; | |
5212 | done: | |
5213 | if (err) | |
5214 | MD_BUG(); | |
5215 | abort: | |
5216 | return err; | |
5217 | } | |
5218 | ||
a39907fa | 5219 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5220 | { |
5221 | /* | |
5222 | * Succeed if we can lock the mddev, which confirms that | |
5223 | * it isn't being stopped right now. | |
5224 | */ | |
d3374825 | 5225 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5226 | int err; |
5227 | ||
d3374825 N |
5228 | if (mddev->gendisk != bdev->bd_disk) { |
5229 | /* we are racing with mddev_put which is discarding this | |
5230 | * bd_disk. | |
5231 | */ | |
5232 | mddev_put(mddev); | |
5233 | /* Wait until bdev->bd_disk is definitely gone */ | |
5234 | flush_scheduled_work(); | |
5235 | /* Then retry the open from the top */ | |
5236 | return -ERESTARTSYS; | |
5237 | } | |
5238 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5239 | ||
d63a5a74 | 5240 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5241 | goto out; |
5242 | ||
5243 | err = 0; | |
f2ea68cf | 5244 | atomic_inc(&mddev->openers); |
1da177e4 LT |
5245 | mddev_unlock(mddev); |
5246 | ||
a39907fa | 5247 | check_disk_change(bdev); |
1da177e4 LT |
5248 | out: |
5249 | return err; | |
5250 | } | |
5251 | ||
a39907fa | 5252 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5253 | { |
a39907fa | 5254 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5255 | |
52e5f9d1 | 5256 | BUG_ON(!mddev); |
f2ea68cf | 5257 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5258 | mddev_put(mddev); |
5259 | ||
5260 | return 0; | |
5261 | } | |
5262 | ||
44ce6294 LT |
5263 | static int md_media_changed(struct gendisk *disk) |
5264 | { | |
5265 | mddev_t *mddev = disk->private_data; | |
5266 | ||
5267 | return mddev->changed; | |
5268 | } | |
5269 | ||
5270 | static int md_revalidate(struct gendisk *disk) | |
5271 | { | |
5272 | mddev_t *mddev = disk->private_data; | |
5273 | ||
5274 | mddev->changed = 0; | |
5275 | return 0; | |
5276 | } | |
1da177e4 LT |
5277 | static struct block_device_operations md_fops = |
5278 | { | |
5279 | .owner = THIS_MODULE, | |
a39907fa AV |
5280 | .open = md_open, |
5281 | .release = md_release, | |
5282 | .locked_ioctl = md_ioctl, | |
a885c8c4 | 5283 | .getgeo = md_getgeo, |
44ce6294 LT |
5284 | .media_changed = md_media_changed, |
5285 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5286 | }; |
5287 | ||
75c96f85 | 5288 | static int md_thread(void * arg) |
1da177e4 LT |
5289 | { |
5290 | mdk_thread_t *thread = arg; | |
5291 | ||
1da177e4 LT |
5292 | /* |
5293 | * md_thread is a 'system-thread', it's priority should be very | |
5294 | * high. We avoid resource deadlocks individually in each | |
5295 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5296 | * the very same RT priority as kswapd, thus we will never get | |
5297 | * into a priority inversion deadlock. | |
5298 | * | |
5299 | * we definitely have to have equal or higher priority than | |
5300 | * bdflush, otherwise bdflush will deadlock if there are too | |
5301 | * many dirty RAID5 blocks. | |
5302 | */ | |
1da177e4 | 5303 | |
6985c43f | 5304 | allow_signal(SIGKILL); |
a6fb0934 | 5305 | while (!kthread_should_stop()) { |
1da177e4 | 5306 | |
93588e22 N |
5307 | /* We need to wait INTERRUPTIBLE so that |
5308 | * we don't add to the load-average. | |
5309 | * That means we need to be sure no signals are | |
5310 | * pending | |
5311 | */ | |
5312 | if (signal_pending(current)) | |
5313 | flush_signals(current); | |
5314 | ||
5315 | wait_event_interruptible_timeout | |
5316 | (thread->wqueue, | |
5317 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5318 | || kthread_should_stop(), | |
5319 | thread->timeout); | |
1da177e4 LT |
5320 | |
5321 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5322 | ||
787453c2 | 5323 | thread->run(thread->mddev); |
1da177e4 | 5324 | } |
a6fb0934 | 5325 | |
1da177e4 LT |
5326 | return 0; |
5327 | } | |
5328 | ||
5329 | void md_wakeup_thread(mdk_thread_t *thread) | |
5330 | { | |
5331 | if (thread) { | |
5332 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5333 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5334 | wake_up(&thread->wqueue); | |
5335 | } | |
5336 | } | |
5337 | ||
5338 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5339 | const char *name) | |
5340 | { | |
5341 | mdk_thread_t *thread; | |
1da177e4 | 5342 | |
9ffae0cf | 5343 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5344 | if (!thread) |
5345 | return NULL; | |
5346 | ||
1da177e4 LT |
5347 | init_waitqueue_head(&thread->wqueue); |
5348 | ||
1da177e4 LT |
5349 | thread->run = run; |
5350 | thread->mddev = mddev; | |
32a7627c | 5351 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5352 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5353 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5354 | kfree(thread); |
5355 | return NULL; | |
5356 | } | |
1da177e4 LT |
5357 | return thread; |
5358 | } | |
5359 | ||
1da177e4 LT |
5360 | void md_unregister_thread(mdk_thread_t *thread) |
5361 | { | |
ba25f9dc | 5362 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5363 | |
5364 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5365 | kfree(thread); |
5366 | } | |
5367 | ||
5368 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5369 | { | |
5370 | if (!mddev) { | |
5371 | MD_BUG(); | |
5372 | return; | |
5373 | } | |
5374 | ||
b2d444d7 | 5375 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5376 | return; |
6bfe0b49 DW |
5377 | |
5378 | if (mddev->external) | |
5379 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5380 | /* |
1da177e4 LT |
5381 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5382 | mdname(mddev), | |
5383 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5384 | __builtin_return_address(0),__builtin_return_address(1), | |
5385 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5386 | */ |
d0a0a5ee AM |
5387 | if (!mddev->pers) |
5388 | return; | |
1da177e4 LT |
5389 | if (!mddev->pers->error_handler) |
5390 | return; | |
5391 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5392 | if (mddev->degraded) |
5393 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5394 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5395 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5396 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5397 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5398 | md_new_event_inintr(mddev); |
1da177e4 LT |
5399 | } |
5400 | ||
5401 | /* seq_file implementation /proc/mdstat */ | |
5402 | ||
5403 | static void status_unused(struct seq_file *seq) | |
5404 | { | |
5405 | int i = 0; | |
5406 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5407 | |
5408 | seq_printf(seq, "unused devices: "); | |
5409 | ||
159ec1fc | 5410 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5411 | char b[BDEVNAME_SIZE]; |
5412 | i++; | |
5413 | seq_printf(seq, "%s ", | |
5414 | bdevname(rdev->bdev,b)); | |
5415 | } | |
5416 | if (!i) | |
5417 | seq_printf(seq, "<none>"); | |
5418 | ||
5419 | seq_printf(seq, "\n"); | |
5420 | } | |
5421 | ||
5422 | ||
5423 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5424 | { | |
4588b42e N |
5425 | sector_t max_blocks, resync, res; |
5426 | unsigned long dt, db, rt; | |
5427 | int scale; | |
5428 | unsigned int per_milli; | |
1da177e4 LT |
5429 | |
5430 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
5431 | ||
5432 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5433 | max_blocks = mddev->resync_max_sectors >> 1; | |
5434 | else | |
5435 | max_blocks = mddev->size; | |
5436 | ||
5437 | /* | |
5438 | * Should not happen. | |
5439 | */ | |
5440 | if (!max_blocks) { | |
5441 | MD_BUG(); | |
5442 | return; | |
5443 | } | |
4588b42e N |
5444 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
5445 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
5446 | * u32, as those are the requirements for sector_div. | |
5447 | * Thus 'scale' must be at least 10 | |
5448 | */ | |
5449 | scale = 10; | |
5450 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5451 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
5452 | scale++; | |
5453 | } | |
5454 | res = (resync>>scale)*1000; | |
5455 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
5456 | ||
5457 | per_milli = res; | |
1da177e4 | 5458 | { |
4588b42e | 5459 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5460 | seq_printf(seq, "["); |
5461 | for (i = 0; i < x; i++) | |
5462 | seq_printf(seq, "="); | |
5463 | seq_printf(seq, ">"); | |
5464 | for (i = 0; i < y; i++) | |
5465 | seq_printf(seq, "."); | |
5466 | seq_printf(seq, "] "); | |
5467 | } | |
4588b42e | 5468 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5469 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5470 | "reshape" : | |
61df9d91 N |
5471 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5472 | "check" : | |
5473 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5474 | "resync" : "recovery"))), | |
5475 | per_milli/10, per_milli % 10, | |
4588b42e N |
5476 | (unsigned long long) resync, |
5477 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5478 | |
5479 | /* | |
5480 | * We do not want to overflow, so the order of operands and | |
5481 | * the * 100 / 100 trick are important. We do a +1 to be | |
5482 | * safe against division by zero. We only estimate anyway. | |
5483 | * | |
5484 | * dt: time from mark until now | |
5485 | * db: blocks written from mark until now | |
5486 | * rt: remaining time | |
5487 | */ | |
5488 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5489 | if (!dt) dt++; | |
ff4e8d9a N |
5490 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5491 | - mddev->resync_mark_cnt; | |
5492 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5493 | |
5494 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5495 | ||
ff4e8d9a | 5496 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5497 | } |
5498 | ||
5499 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5500 | { | |
5501 | struct list_head *tmp; | |
5502 | loff_t l = *pos; | |
5503 | mddev_t *mddev; | |
5504 | ||
5505 | if (l >= 0x10000) | |
5506 | return NULL; | |
5507 | if (!l--) | |
5508 | /* header */ | |
5509 | return (void*)1; | |
5510 | ||
5511 | spin_lock(&all_mddevs_lock); | |
5512 | list_for_each(tmp,&all_mddevs) | |
5513 | if (!l--) { | |
5514 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5515 | mddev_get(mddev); | |
5516 | spin_unlock(&all_mddevs_lock); | |
5517 | return mddev; | |
5518 | } | |
5519 | spin_unlock(&all_mddevs_lock); | |
5520 | if (!l--) | |
5521 | return (void*)2;/* tail */ | |
5522 | return NULL; | |
5523 | } | |
5524 | ||
5525 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5526 | { | |
5527 | struct list_head *tmp; | |
5528 | mddev_t *next_mddev, *mddev = v; | |
5529 | ||
5530 | ++*pos; | |
5531 | if (v == (void*)2) | |
5532 | return NULL; | |
5533 | ||
5534 | spin_lock(&all_mddevs_lock); | |
5535 | if (v == (void*)1) | |
5536 | tmp = all_mddevs.next; | |
5537 | else | |
5538 | tmp = mddev->all_mddevs.next; | |
5539 | if (tmp != &all_mddevs) | |
5540 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5541 | else { | |
5542 | next_mddev = (void*)2; | |
5543 | *pos = 0x10000; | |
5544 | } | |
5545 | spin_unlock(&all_mddevs_lock); | |
5546 | ||
5547 | if (v != (void*)1) | |
5548 | mddev_put(mddev); | |
5549 | return next_mddev; | |
5550 | ||
5551 | } | |
5552 | ||
5553 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5554 | { | |
5555 | mddev_t *mddev = v; | |
5556 | ||
5557 | if (mddev && v != (void*)1 && v != (void*)2) | |
5558 | mddev_put(mddev); | |
5559 | } | |
5560 | ||
d7603b7e N |
5561 | struct mdstat_info { |
5562 | int event; | |
5563 | }; | |
5564 | ||
1da177e4 LT |
5565 | static int md_seq_show(struct seq_file *seq, void *v) |
5566 | { | |
5567 | mddev_t *mddev = v; | |
5568 | sector_t size; | |
1da177e4 | 5569 | mdk_rdev_t *rdev; |
d7603b7e | 5570 | struct mdstat_info *mi = seq->private; |
32a7627c | 5571 | struct bitmap *bitmap; |
1da177e4 LT |
5572 | |
5573 | if (v == (void*)1) { | |
2604b703 | 5574 | struct mdk_personality *pers; |
1da177e4 LT |
5575 | seq_printf(seq, "Personalities : "); |
5576 | spin_lock(&pers_lock); | |
2604b703 N |
5577 | list_for_each_entry(pers, &pers_list, list) |
5578 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5579 | |
5580 | spin_unlock(&pers_lock); | |
5581 | seq_printf(seq, "\n"); | |
d7603b7e | 5582 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5583 | return 0; |
5584 | } | |
5585 | if (v == (void*)2) { | |
5586 | status_unused(seq); | |
5587 | return 0; | |
5588 | } | |
5589 | ||
5dc5cf7d | 5590 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5591 | return -EINTR; |
5dc5cf7d | 5592 | |
1da177e4 LT |
5593 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5594 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5595 | mddev->pers ? "" : "in"); | |
5596 | if (mddev->pers) { | |
f91de92e | 5597 | if (mddev->ro==1) |
1da177e4 | 5598 | seq_printf(seq, " (read-only)"); |
f91de92e | 5599 | if (mddev->ro==2) |
52720ae7 | 5600 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5601 | seq_printf(seq, " %s", mddev->pers->name); |
5602 | } | |
5603 | ||
5604 | size = 0; | |
159ec1fc | 5605 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5606 | char b[BDEVNAME_SIZE]; |
5607 | seq_printf(seq, " %s[%d]", | |
5608 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5609 | if (test_bit(WriteMostly, &rdev->flags)) |
5610 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5611 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5612 | seq_printf(seq, "(F)"); |
5613 | continue; | |
b325a32e N |
5614 | } else if (rdev->raid_disk < 0) |
5615 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
5616 | size += rdev->size; |
5617 | } | |
5618 | ||
5619 | if (!list_empty(&mddev->disks)) { | |
5620 | if (mddev->pers) | |
5621 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
5622 | (unsigned long long) |
5623 | mddev->array_sectors / 2); | |
1da177e4 LT |
5624 | else |
5625 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c | 5626 | (unsigned long long)size); |
1da177e4 | 5627 | } |
1cd6bf19 N |
5628 | if (mddev->persistent) { |
5629 | if (mddev->major_version != 0 || | |
5630 | mddev->minor_version != 90) { | |
5631 | seq_printf(seq," super %d.%d", | |
5632 | mddev->major_version, | |
5633 | mddev->minor_version); | |
5634 | } | |
e691063a N |
5635 | } else if (mddev->external) |
5636 | seq_printf(seq, " super external:%s", | |
5637 | mddev->metadata_type); | |
5638 | else | |
1cd6bf19 | 5639 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5640 | |
5641 | if (mddev->pers) { | |
d710e138 | 5642 | mddev->pers->status(seq, mddev); |
1da177e4 | 5643 | seq_printf(seq, "\n "); |
8e1b39d6 N |
5644 | if (mddev->pers->sync_request) { |
5645 | if (mddev->curr_resync > 2) { | |
d710e138 | 5646 | status_resync(seq, mddev); |
8e1b39d6 N |
5647 | seq_printf(seq, "\n "); |
5648 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5649 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5650 | else if (mddev->recovery_cp < MaxSector) | |
5651 | seq_printf(seq, "\tresync=PENDING\n "); | |
5652 | } | |
32a7627c N |
5653 | } else |
5654 | seq_printf(seq, "\n "); | |
5655 | ||
5656 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5657 | unsigned long chunk_kb; |
5658 | unsigned long flags; | |
32a7627c N |
5659 | spin_lock_irqsave(&bitmap->lock, flags); |
5660 | chunk_kb = bitmap->chunksize >> 10; | |
5661 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5662 | "%lu%s chunk", | |
5663 | bitmap->pages - bitmap->missing_pages, | |
5664 | bitmap->pages, | |
5665 | (bitmap->pages - bitmap->missing_pages) | |
5666 | << (PAGE_SHIFT - 10), | |
5667 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5668 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5669 | if (bitmap->file) { |
5670 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5671 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5672 | } |
78d742d8 | 5673 | |
32a7627c N |
5674 | seq_printf(seq, "\n"); |
5675 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5676 | } |
5677 | ||
5678 | seq_printf(seq, "\n"); | |
5679 | } | |
5680 | mddev_unlock(mddev); | |
5681 | ||
5682 | return 0; | |
5683 | } | |
5684 | ||
5685 | static struct seq_operations md_seq_ops = { | |
5686 | .start = md_seq_start, | |
5687 | .next = md_seq_next, | |
5688 | .stop = md_seq_stop, | |
5689 | .show = md_seq_show, | |
5690 | }; | |
5691 | ||
5692 | static int md_seq_open(struct inode *inode, struct file *file) | |
5693 | { | |
5694 | int error; | |
d7603b7e N |
5695 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5696 | if (mi == NULL) | |
5697 | return -ENOMEM; | |
1da177e4 LT |
5698 | |
5699 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5700 | if (error) |
5701 | kfree(mi); | |
5702 | else { | |
5703 | struct seq_file *p = file->private_data; | |
5704 | p->private = mi; | |
5705 | mi->event = atomic_read(&md_event_count); | |
5706 | } | |
1da177e4 LT |
5707 | return error; |
5708 | } | |
5709 | ||
d7603b7e N |
5710 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5711 | { | |
5712 | struct seq_file *m = filp->private_data; | |
5713 | struct mdstat_info *mi = m->private; | |
5714 | int mask; | |
5715 | ||
5716 | poll_wait(filp, &md_event_waiters, wait); | |
5717 | ||
5718 | /* always allow read */ | |
5719 | mask = POLLIN | POLLRDNORM; | |
5720 | ||
5721 | if (mi->event != atomic_read(&md_event_count)) | |
5722 | mask |= POLLERR | POLLPRI; | |
5723 | return mask; | |
5724 | } | |
5725 | ||
fa027c2a | 5726 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5727 | .owner = THIS_MODULE, |
1da177e4 LT |
5728 | .open = md_seq_open, |
5729 | .read = seq_read, | |
5730 | .llseek = seq_lseek, | |
c3f94b40 | 5731 | .release = seq_release_private, |
d7603b7e | 5732 | .poll = mdstat_poll, |
1da177e4 LT |
5733 | }; |
5734 | ||
2604b703 | 5735 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5736 | { |
1da177e4 | 5737 | spin_lock(&pers_lock); |
2604b703 N |
5738 | list_add_tail(&p->list, &pers_list); |
5739 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5740 | spin_unlock(&pers_lock); |
5741 | return 0; | |
5742 | } | |
5743 | ||
2604b703 | 5744 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5745 | { |
2604b703 | 5746 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5747 | spin_lock(&pers_lock); |
2604b703 | 5748 | list_del_init(&p->list); |
1da177e4 LT |
5749 | spin_unlock(&pers_lock); |
5750 | return 0; | |
5751 | } | |
5752 | ||
eea1bf38 | 5753 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
5754 | { |
5755 | mdk_rdev_t * rdev; | |
1da177e4 | 5756 | int idle; |
eea1bf38 | 5757 | int curr_events; |
1da177e4 LT |
5758 | |
5759 | idle = 1; | |
4b80991c N |
5760 | rcu_read_lock(); |
5761 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5762 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
5763 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
5764 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
5765 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
5766 | /* sync IO will cause sync_io to increase before the disk_stats |
5767 | * as sync_io is counted when a request starts, and | |
5768 | * disk_stats is counted when it completes. | |
5769 | * So resync activity will cause curr_events to be smaller than | |
5770 | * when there was no such activity. | |
5771 | * non-sync IO will cause disk_stat to increase without | |
5772 | * increasing sync_io so curr_events will (eventually) | |
5773 | * be larger than it was before. Once it becomes | |
5774 | * substantially larger, the test below will cause | |
5775 | * the array to appear non-idle, and resync will slow | |
5776 | * down. | |
5777 | * If there is a lot of outstanding resync activity when | |
5778 | * we set last_event to curr_events, then all that activity | |
5779 | * completing might cause the array to appear non-idle | |
5780 | * and resync will be slowed down even though there might | |
5781 | * not have been non-resync activity. This will only | |
5782 | * happen once though. 'last_events' will soon reflect | |
5783 | * the state where there is little or no outstanding | |
5784 | * resync requests, and further resync activity will | |
5785 | * always make curr_events less than last_events. | |
c0e48521 | 5786 | * |
1da177e4 | 5787 | */ |
eea1bf38 | 5788 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
5789 | rdev->last_events = curr_events; |
5790 | idle = 0; | |
5791 | } | |
5792 | } | |
4b80991c | 5793 | rcu_read_unlock(); |
1da177e4 LT |
5794 | return idle; |
5795 | } | |
5796 | ||
5797 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5798 | { | |
5799 | /* another "blocks" (512byte) blocks have been synced */ | |
5800 | atomic_sub(blocks, &mddev->recovery_active); | |
5801 | wake_up(&mddev->recovery_wait); | |
5802 | if (!ok) { | |
dfc70645 | 5803 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5804 | md_wakeup_thread(mddev->thread); |
5805 | // stop recovery, signal do_sync .... | |
5806 | } | |
5807 | } | |
5808 | ||
5809 | ||
06d91a5f N |
5810 | /* md_write_start(mddev, bi) |
5811 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5812 | * in superblock) before writing, schedule a superblock update |
5813 | * and wait for it to complete. | |
06d91a5f | 5814 | */ |
3d310eb7 | 5815 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5816 | { |
0fd62b86 | 5817 | int did_change = 0; |
06d91a5f | 5818 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5819 | return; |
06d91a5f | 5820 | |
f91de92e N |
5821 | BUG_ON(mddev->ro == 1); |
5822 | if (mddev->ro == 2) { | |
5823 | /* need to switch to read/write */ | |
5824 | mddev->ro = 0; | |
5825 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5826 | md_wakeup_thread(mddev->thread); | |
25156198 | 5827 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 5828 | did_change = 1; |
f91de92e | 5829 | } |
06d91a5f | 5830 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
5831 | if (mddev->safemode == 1) |
5832 | mddev->safemode = 0; | |
06d91a5f | 5833 | if (mddev->in_sync) { |
a9701a30 | 5834 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5835 | if (mddev->in_sync) { |
5836 | mddev->in_sync = 0; | |
850b2b42 | 5837 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 5838 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 5839 | did_change = 1; |
3d310eb7 | 5840 | } |
a9701a30 | 5841 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5842 | } |
0fd62b86 | 5843 | if (did_change) |
b62b7590 | 5844 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
5845 | wait_event(mddev->sb_wait, |
5846 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
5847 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
5848 | } |
5849 | ||
5850 | void md_write_end(mddev_t *mddev) | |
5851 | { | |
5852 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5853 | if (mddev->safemode == 2) | |
5854 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5855 | else if (mddev->safemode_delay) |
1da177e4 LT |
5856 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5857 | } | |
5858 | } | |
5859 | ||
2a2275d6 N |
5860 | /* md_allow_write(mddev) |
5861 | * Calling this ensures that the array is marked 'active' so that writes | |
5862 | * may proceed without blocking. It is important to call this before | |
5863 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5864 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
5865 | * |
5866 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
5867 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 5868 | */ |
b5470dc5 | 5869 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
5870 | { |
5871 | if (!mddev->pers) | |
b5470dc5 | 5872 | return 0; |
2a2275d6 | 5873 | if (mddev->ro) |
b5470dc5 | 5874 | return 0; |
1a0fd497 | 5875 | if (!mddev->pers->sync_request) |
b5470dc5 | 5876 | return 0; |
2a2275d6 N |
5877 | |
5878 | spin_lock_irq(&mddev->write_lock); | |
5879 | if (mddev->in_sync) { | |
5880 | mddev->in_sync = 0; | |
5881 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5882 | if (mddev->safemode_delay && | |
5883 | mddev->safemode == 0) | |
5884 | mddev->safemode = 1; | |
5885 | spin_unlock_irq(&mddev->write_lock); | |
5886 | md_update_sb(mddev, 0); | |
b62b7590 | 5887 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
5888 | } else |
5889 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
5890 | |
5891 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
5892 | return -EAGAIN; | |
5893 | else | |
5894 | return 0; | |
2a2275d6 N |
5895 | } |
5896 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5897 | ||
1da177e4 LT |
5898 | #define SYNC_MARKS 10 |
5899 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5900 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5901 | { |
5902 | mddev_t *mddev2; | |
5903 | unsigned int currspeed = 0, | |
5904 | window; | |
57afd89f | 5905 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5906 | unsigned long mark[SYNC_MARKS]; |
5907 | sector_t mark_cnt[SYNC_MARKS]; | |
5908 | int last_mark,m; | |
5909 | struct list_head *tmp; | |
5910 | sector_t last_check; | |
57afd89f | 5911 | int skipped = 0; |
5fd6c1dc | 5912 | mdk_rdev_t *rdev; |
61df9d91 | 5913 | char *desc; |
1da177e4 LT |
5914 | |
5915 | /* just incase thread restarts... */ | |
5916 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5917 | return; | |
5fd6c1dc N |
5918 | if (mddev->ro) /* never try to sync a read-only array */ |
5919 | return; | |
1da177e4 | 5920 | |
61df9d91 N |
5921 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5922 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5923 | desc = "data-check"; | |
5924 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5925 | desc = "requested-resync"; | |
5926 | else | |
5927 | desc = "resync"; | |
5928 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5929 | desc = "reshape"; | |
5930 | else | |
5931 | desc = "recovery"; | |
5932 | ||
1da177e4 LT |
5933 | /* we overload curr_resync somewhat here. |
5934 | * 0 == not engaged in resync at all | |
5935 | * 2 == checking that there is no conflict with another sync | |
5936 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5937 | * commense | |
5938 | * other == active in resync - this many blocks | |
5939 | * | |
5940 | * Before starting a resync we must have set curr_resync to | |
5941 | * 2, and then checked that every "conflicting" array has curr_resync | |
5942 | * less than ours. When we find one that is the same or higher | |
5943 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5944 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5945 | * This will mean we have to start checking from the beginning again. | |
5946 | * | |
5947 | */ | |
5948 | ||
5949 | do { | |
5950 | mddev->curr_resync = 2; | |
5951 | ||
5952 | try_again: | |
787453c2 | 5953 | if (kthread_should_stop()) { |
6985c43f | 5954 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5955 | goto skip; |
5956 | } | |
29ac4aa3 | 5957 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
5958 | if (mddev2 == mddev) |
5959 | continue; | |
90b08710 BS |
5960 | if (!mddev->parallel_resync |
5961 | && mddev2->curr_resync | |
5962 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
5963 | DEFINE_WAIT(wq); |
5964 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5965 | /* arbitrarily yield */ | |
5966 | mddev->curr_resync = 1; | |
5967 | wake_up(&resync_wait); | |
5968 | } | |
5969 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5970 | /* no need to wait here, we can wait the next | |
5971 | * time 'round when curr_resync == 2 | |
5972 | */ | |
5973 | continue; | |
9744197c N |
5974 | /* We need to wait 'interruptible' so as not to |
5975 | * contribute to the load average, and not to | |
5976 | * be caught by 'softlockup' | |
5977 | */ | |
5978 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 5979 | if (!kthread_should_stop() && |
8712e553 | 5980 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5981 | printk(KERN_INFO "md: delaying %s of %s" |
5982 | " until %s has finished (they" | |
1da177e4 | 5983 | " share one or more physical units)\n", |
61df9d91 | 5984 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 5985 | mddev_put(mddev2); |
9744197c N |
5986 | if (signal_pending(current)) |
5987 | flush_signals(current); | |
1da177e4 LT |
5988 | schedule(); |
5989 | finish_wait(&resync_wait, &wq); | |
5990 | goto try_again; | |
5991 | } | |
5992 | finish_wait(&resync_wait, &wq); | |
5993 | } | |
5994 | } | |
5995 | } while (mddev->curr_resync < 2); | |
5996 | ||
5fd6c1dc | 5997 | j = 0; |
9d88883e | 5998 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5999 | /* resync follows the size requested by the personality, |
57afd89f | 6000 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6001 | */ |
6002 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6003 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6004 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6005 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6006 | j = mddev->resync_min; | |
6007 | else if (!mddev->bitmap) | |
5fd6c1dc | 6008 | j = mddev->recovery_cp; |
5e96ee65 | 6009 | |
ccfcc3c1 N |
6010 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
6011 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 6012 | else { |
1da177e4 LT |
6013 | /* recovery follows the physical size of devices */ |
6014 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 6015 | j = MaxSector; |
159ec1fc | 6016 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6017 | if (rdev->raid_disk >= 0 && |
6018 | !test_bit(Faulty, &rdev->flags) && | |
6019 | !test_bit(In_sync, &rdev->flags) && | |
6020 | rdev->recovery_offset < j) | |
6021 | j = rdev->recovery_offset; | |
6022 | } | |
1da177e4 | 6023 | |
61df9d91 N |
6024 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6025 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6026 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6027 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6028 | "(but not more than %d KB/sec) for %s.\n", |
6029 | speed_max(mddev), desc); | |
1da177e4 | 6030 | |
eea1bf38 | 6031 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6032 | |
57afd89f | 6033 | io_sectors = 0; |
1da177e4 LT |
6034 | for (m = 0; m < SYNC_MARKS; m++) { |
6035 | mark[m] = jiffies; | |
57afd89f | 6036 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6037 | } |
6038 | last_mark = 0; | |
6039 | mddev->resync_mark = mark[last_mark]; | |
6040 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6041 | ||
6042 | /* | |
6043 | * Tune reconstruction: | |
6044 | */ | |
6045 | window = 32*(PAGE_SIZE/512); | |
6046 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6047 | window/2,(unsigned long long) max_sectors/2); | |
6048 | ||
6049 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6050 | last_check = 0; |
6051 | ||
6052 | if (j>2) { | |
6053 | printk(KERN_INFO | |
61df9d91 N |
6054 | "md: resuming %s of %s from checkpoint.\n", |
6055 | desc, mdname(mddev)); | |
1da177e4 LT |
6056 | mddev->curr_resync = j; |
6057 | } | |
6058 | ||
6059 | while (j < max_sectors) { | |
57afd89f | 6060 | sector_t sectors; |
1da177e4 | 6061 | |
57afd89f | 6062 | skipped = 0; |
c6207277 N |
6063 | if (j >= mddev->resync_max) { |
6064 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
6065 | wait_event(mddev->recovery_wait, | |
6066 | mddev->resync_max > j | |
6067 | || kthread_should_stop()); | |
6068 | } | |
6069 | if (kthread_should_stop()) | |
6070 | goto interrupted; | |
57afd89f | 6071 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6072 | currspeed < speed_min(mddev)); |
57afd89f | 6073 | if (sectors == 0) { |
dfc70645 | 6074 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6075 | goto out; |
6076 | } | |
57afd89f N |
6077 | |
6078 | if (!skipped) { /* actual IO requested */ | |
6079 | io_sectors += sectors; | |
6080 | atomic_add(sectors, &mddev->recovery_active); | |
6081 | } | |
6082 | ||
1da177e4 LT |
6083 | j += sectors; |
6084 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6085 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6086 | if (last_check == 0) |
6087 | /* this is the earliers that rebuilt will be | |
6088 | * visible in /proc/mdstat | |
6089 | */ | |
6090 | md_new_event(mddev); | |
57afd89f N |
6091 | |
6092 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6093 | continue; |
6094 | ||
57afd89f | 6095 | last_check = io_sectors; |
1da177e4 | 6096 | |
dfc70645 | 6097 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6098 | break; |
6099 | ||
6100 | repeat: | |
6101 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6102 | /* step marks */ | |
6103 | int next = (last_mark+1) % SYNC_MARKS; | |
6104 | ||
6105 | mddev->resync_mark = mark[next]; | |
6106 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6107 | mark[next] = jiffies; | |
57afd89f | 6108 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6109 | last_mark = next; |
6110 | } | |
6111 | ||
6112 | ||
c6207277 N |
6113 | if (kthread_should_stop()) |
6114 | goto interrupted; | |
6115 | ||
1da177e4 LT |
6116 | |
6117 | /* | |
6118 | * this loop exits only if either when we are slower than | |
6119 | * the 'hard' speed limit, or the system was IO-idle for | |
6120 | * a jiffy. | |
6121 | * the system might be non-idle CPU-wise, but we only care | |
6122 | * about not overloading the IO subsystem. (things like an | |
6123 | * e2fsck being done on the RAID array should execute fast) | |
6124 | */ | |
2ad8b1ef | 6125 | blk_unplug(mddev->queue); |
1da177e4 LT |
6126 | cond_resched(); |
6127 | ||
57afd89f N |
6128 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6129 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6130 | |
88202a0c N |
6131 | if (currspeed > speed_min(mddev)) { |
6132 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6133 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6134 | msleep(500); |
1da177e4 LT |
6135 | goto repeat; |
6136 | } | |
6137 | } | |
6138 | } | |
61df9d91 | 6139 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6140 | /* |
6141 | * this also signals 'finished resyncing' to md_stop | |
6142 | */ | |
6143 | out: | |
2ad8b1ef | 6144 | blk_unplug(mddev->queue); |
1da177e4 LT |
6145 | |
6146 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6147 | ||
6148 | /* tell personality that we are finished */ | |
57afd89f | 6149 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6150 | |
dfc70645 | 6151 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6152 | mddev->curr_resync > 2) { |
6153 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6154 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6155 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6156 | printk(KERN_INFO | |
61df9d91 N |
6157 | "md: checkpointing %s of %s.\n", |
6158 | desc, mdname(mddev)); | |
5fd6c1dc N |
6159 | mddev->recovery_cp = mddev->curr_resync; |
6160 | } | |
6161 | } else | |
6162 | mddev->recovery_cp = MaxSector; | |
6163 | } else { | |
6164 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6165 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6166 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6167 | if (rdev->raid_disk >= 0 && |
6168 | !test_bit(Faulty, &rdev->flags) && | |
6169 | !test_bit(In_sync, &rdev->flags) && | |
6170 | rdev->recovery_offset < mddev->curr_resync) | |
6171 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6172 | } |
1da177e4 | 6173 | } |
17571284 | 6174 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6175 | |
1da177e4 LT |
6176 | skip: |
6177 | mddev->curr_resync = 0; | |
5e96ee65 | 6178 | mddev->resync_min = 0; |
c6207277 N |
6179 | mddev->resync_max = MaxSector; |
6180 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
6181 | wake_up(&resync_wait); |
6182 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6183 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6184 | return; |
6185 | ||
6186 | interrupted: | |
6187 | /* | |
6188 | * got a signal, exit. | |
6189 | */ | |
6190 | printk(KERN_INFO | |
6191 | "md: md_do_sync() got signal ... exiting\n"); | |
6192 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6193 | goto out; | |
6194 | ||
1da177e4 | 6195 | } |
29269553 | 6196 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6197 | |
6198 | ||
b4c4c7b8 N |
6199 | static int remove_and_add_spares(mddev_t *mddev) |
6200 | { | |
6201 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6202 | int spares = 0; |
6203 | ||
159ec1fc | 6204 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6205 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6206 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6207 | (test_bit(Faulty, &rdev->flags) || |
6208 | ! test_bit(In_sync, &rdev->flags)) && | |
6209 | atomic_read(&rdev->nr_pending)==0) { | |
6210 | if (mddev->pers->hot_remove_disk( | |
6211 | mddev, rdev->raid_disk)==0) { | |
6212 | char nm[20]; | |
6213 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6214 | sysfs_remove_link(&mddev->kobj, nm); | |
6215 | rdev->raid_disk = -1; | |
6216 | } | |
6217 | } | |
6218 | ||
4044ba58 | 6219 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6220 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6221 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6222 | !test_bit(In_sync, &rdev->flags) && |
6223 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6224 | spares++; |
b4c4c7b8 N |
6225 | if (rdev->raid_disk < 0 |
6226 | && !test_bit(Faulty, &rdev->flags)) { | |
6227 | rdev->recovery_offset = 0; | |
199050ea NB |
6228 | if (mddev->pers-> |
6229 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6230 | char nm[20]; |
6231 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6232 | if (sysfs_create_link(&mddev->kobj, |
6233 | &rdev->kobj, nm)) | |
6234 | printk(KERN_WARNING | |
6235 | "md: cannot register " | |
6236 | "%s for %s\n", | |
6237 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6238 | spares++; |
6239 | md_new_event(mddev); | |
6240 | } else | |
6241 | break; | |
6242 | } | |
dfc70645 | 6243 | } |
b4c4c7b8 N |
6244 | } |
6245 | return spares; | |
6246 | } | |
1da177e4 LT |
6247 | /* |
6248 | * This routine is regularly called by all per-raid-array threads to | |
6249 | * deal with generic issues like resync and super-block update. | |
6250 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6251 | * need this as they never do any recovery or update the superblock. | |
6252 | * | |
6253 | * It does not do any resync itself, but rather "forks" off other threads | |
6254 | * to do that as needed. | |
6255 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6256 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6257 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6258 | * and wakeups up this thread which will reap the thread and finish up. |
6259 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6260 | * | |
6261 | * The overall approach is: | |
6262 | * 1/ if the superblock needs updating, update it. | |
6263 | * 2/ If a recovery thread is running, don't do anything else. | |
6264 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6265 | * 4/ If there are any faulty devices, remove them. | |
6266 | * 5/ If array is degraded, try to add spares devices | |
6267 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6268 | */ | |
6269 | void md_check_recovery(mddev_t *mddev) | |
6270 | { | |
6271 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6272 | |
6273 | ||
5f40402d N |
6274 | if (mddev->bitmap) |
6275 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
6276 | |
6277 | if (mddev->ro) | |
6278 | return; | |
fca4d848 N |
6279 | |
6280 | if (signal_pending(current)) { | |
31a59e34 | 6281 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6282 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6283 | mdname(mddev)); | |
6284 | mddev->safemode = 2; | |
6285 | } | |
6286 | flush_signals(current); | |
6287 | } | |
6288 | ||
c89a8eee N |
6289 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6290 | return; | |
1da177e4 | 6291 | if ( ! ( |
e691063a | 6292 | (mddev->flags && !mddev->external) || |
1da177e4 | 6293 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6294 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6295 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6296 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6297 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6298 | )) |
6299 | return; | |
fca4d848 | 6300 | |
df5b89b3 | 6301 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6302 | int spares = 0; |
fca4d848 | 6303 | |
c89a8eee N |
6304 | if (mddev->ro) { |
6305 | /* Only thing we do on a ro array is remove | |
6306 | * failed devices. | |
6307 | */ | |
6308 | remove_and_add_spares(mddev); | |
6309 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6310 | goto unlock; | |
6311 | } | |
6312 | ||
31a59e34 | 6313 | if (!mddev->external) { |
0fd62b86 | 6314 | int did_change = 0; |
31a59e34 N |
6315 | spin_lock_irq(&mddev->write_lock); |
6316 | if (mddev->safemode && | |
6317 | !atomic_read(&mddev->writes_pending) && | |
6318 | !mddev->in_sync && | |
6319 | mddev->recovery_cp == MaxSector) { | |
6320 | mddev->in_sync = 1; | |
0fd62b86 | 6321 | did_change = 1; |
31a59e34 N |
6322 | if (mddev->persistent) |
6323 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6324 | } | |
6325 | if (mddev->safemode == 1) | |
6326 | mddev->safemode = 0; | |
6327 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6328 | if (did_change) |
b62b7590 | 6329 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6330 | } |
fca4d848 | 6331 | |
850b2b42 N |
6332 | if (mddev->flags) |
6333 | md_update_sb(mddev, 0); | |
06d91a5f | 6334 | |
159ec1fc | 6335 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6336 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6337 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6338 | |
06d91a5f | 6339 | |
1da177e4 LT |
6340 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6341 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6342 | /* resync/recovery still happening */ | |
6343 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6344 | goto unlock; | |
6345 | } | |
6346 | if (mddev->sync_thread) { | |
6347 | /* resync has finished, collect result */ | |
6348 | md_unregister_thread(mddev->sync_thread); | |
6349 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6350 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6351 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6352 | /* success...*/ |
6353 | /* activate any spares */ | |
a99ac971 NB |
6354 | if (mddev->pers->spare_active(mddev)) |
6355 | sysfs_notify(&mddev->kobj, NULL, | |
6356 | "degraded"); | |
1da177e4 | 6357 | } |
850b2b42 | 6358 | md_update_sb(mddev, 1); |
41158c7e N |
6359 | |
6360 | /* if array is no-longer degraded, then any saved_raid_disk | |
6361 | * information must be scrapped | |
6362 | */ | |
6363 | if (!mddev->degraded) | |
159ec1fc | 6364 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6365 | rdev->saved_raid_disk = -1; |
6366 | ||
1da177e4 LT |
6367 | mddev->recovery = 0; |
6368 | /* flag recovery needed just to double check */ | |
6369 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6370 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6371 | md_new_event(mddev); |
1da177e4 LT |
6372 | goto unlock; |
6373 | } | |
72a23c21 NB |
6374 | /* Set RUNNING before clearing NEEDED to avoid |
6375 | * any transients in the value of "sync_action". | |
6376 | */ | |
6377 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6378 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6379 | /* Clear some bits that don't mean anything, but |
6380 | * might be left set | |
6381 | */ | |
24dd469d N |
6382 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6383 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6384 | |
5fd6c1dc N |
6385 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6386 | goto unlock; | |
1da177e4 LT |
6387 | /* no recovery is running. |
6388 | * remove any failed drives, then | |
6389 | * add spares if possible. | |
6390 | * Spare are also removed and re-added, to allow | |
6391 | * the personality to fail the re-add. | |
6392 | */ | |
1da177e4 | 6393 | |
b4c4c7b8 N |
6394 | if (mddev->reshape_position != MaxSector) { |
6395 | if (mddev->pers->check_reshape(mddev) != 0) | |
6396 | /* Cannot proceed */ | |
6397 | goto unlock; | |
6398 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6399 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6400 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6401 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6402 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6403 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6404 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6405 | } else if (mddev->recovery_cp < MaxSector) { |
6406 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6407 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6408 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6409 | /* nothing to be done ... */ | |
1da177e4 | 6410 | goto unlock; |
24dd469d | 6411 | |
1da177e4 | 6412 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6413 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6414 | /* We are adding a device or devices to an array | |
6415 | * which has the bitmap stored on all devices. | |
6416 | * So make sure all bitmap pages get written | |
6417 | */ | |
6418 | bitmap_write_all(mddev->bitmap); | |
6419 | } | |
1da177e4 LT |
6420 | mddev->sync_thread = md_register_thread(md_do_sync, |
6421 | mddev, | |
6422 | "%s_resync"); | |
6423 | if (!mddev->sync_thread) { | |
6424 | printk(KERN_ERR "%s: could not start resync" | |
6425 | " thread...\n", | |
6426 | mdname(mddev)); | |
6427 | /* leave the spares where they are, it shouldn't hurt */ | |
6428 | mddev->recovery = 0; | |
d7603b7e | 6429 | } else |
1da177e4 | 6430 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6431 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6432 | md_new_event(mddev); |
1da177e4 LT |
6433 | } |
6434 | unlock: | |
72a23c21 NB |
6435 | if (!mddev->sync_thread) { |
6436 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6437 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6438 | &mddev->recovery)) | |
0c3573f1 N |
6439 | if (mddev->sysfs_action) |
6440 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6441 | } |
1da177e4 LT |
6442 | mddev_unlock(mddev); |
6443 | } | |
6444 | } | |
6445 | ||
6bfe0b49 DW |
6446 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6447 | { | |
3c0ee63a | 6448 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
6449 | wait_event_timeout(rdev->blocked_wait, |
6450 | !test_bit(Blocked, &rdev->flags), | |
6451 | msecs_to_jiffies(5000)); | |
6452 | rdev_dec_pending(rdev, mddev); | |
6453 | } | |
6454 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6455 | ||
75c96f85 AB |
6456 | static int md_notify_reboot(struct notifier_block *this, |
6457 | unsigned long code, void *x) | |
1da177e4 LT |
6458 | { |
6459 | struct list_head *tmp; | |
6460 | mddev_t *mddev; | |
6461 | ||
6462 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6463 | ||
6464 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6465 | ||
29ac4aa3 | 6466 | for_each_mddev(mddev, tmp) |
c71d4887 | 6467 | if (mddev_trylock(mddev)) { |
2b25000b N |
6468 | /* Force a switch to readonly even array |
6469 | * appears to still be in use. Hence | |
6470 | * the '100'. | |
6471 | */ | |
d710e138 | 6472 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
6473 | mddev_unlock(mddev); |
6474 | } | |
1da177e4 LT |
6475 | /* |
6476 | * certain more exotic SCSI devices are known to be | |
6477 | * volatile wrt too early system reboots. While the | |
6478 | * right place to handle this issue is the given | |
6479 | * driver, we do want to have a safe RAID driver ... | |
6480 | */ | |
6481 | mdelay(1000*1); | |
6482 | } | |
6483 | return NOTIFY_DONE; | |
6484 | } | |
6485 | ||
75c96f85 | 6486 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6487 | .notifier_call = md_notify_reboot, |
6488 | .next = NULL, | |
6489 | .priority = INT_MAX, /* before any real devices */ | |
6490 | }; | |
6491 | ||
6492 | static void md_geninit(void) | |
6493 | { | |
1da177e4 LT |
6494 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6495 | ||
c7705f34 | 6496 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6497 | } |
6498 | ||
75c96f85 | 6499 | static int __init md_init(void) |
1da177e4 | 6500 | { |
3dbd8c2e | 6501 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
6502 | return -1; |
6503 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 6504 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
6505 | return -1; |
6506 | } | |
3dbd8c2e | 6507 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
6508 | md_probe, NULL, NULL); |
6509 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6510 | md_probe, NULL, NULL); |
6511 | ||
1da177e4 | 6512 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6513 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6514 | |
6515 | md_geninit(); | |
d710e138 | 6516 | return 0; |
1da177e4 LT |
6517 | } |
6518 | ||
6519 | ||
6520 | #ifndef MODULE | |
6521 | ||
6522 | /* | |
6523 | * Searches all registered partitions for autorun RAID arrays | |
6524 | * at boot time. | |
6525 | */ | |
4d936ec1 ME |
6526 | |
6527 | static LIST_HEAD(all_detected_devices); | |
6528 | struct detected_devices_node { | |
6529 | struct list_head list; | |
6530 | dev_t dev; | |
6531 | }; | |
1da177e4 LT |
6532 | |
6533 | void md_autodetect_dev(dev_t dev) | |
6534 | { | |
4d936ec1 ME |
6535 | struct detected_devices_node *node_detected_dev; |
6536 | ||
6537 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6538 | if (node_detected_dev) { | |
6539 | node_detected_dev->dev = dev; | |
6540 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6541 | } else { | |
6542 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6543 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6544 | } | |
1da177e4 LT |
6545 | } |
6546 | ||
6547 | ||
6548 | static void autostart_arrays(int part) | |
6549 | { | |
6550 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6551 | struct detected_devices_node *node_detected_dev; |
6552 | dev_t dev; | |
6553 | int i_scanned, i_passed; | |
1da177e4 | 6554 | |
4d936ec1 ME |
6555 | i_scanned = 0; |
6556 | i_passed = 0; | |
1da177e4 | 6557 | |
4d936ec1 | 6558 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6559 | |
4d936ec1 ME |
6560 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6561 | i_scanned++; | |
6562 | node_detected_dev = list_entry(all_detected_devices.next, | |
6563 | struct detected_devices_node, list); | |
6564 | list_del(&node_detected_dev->list); | |
6565 | dev = node_detected_dev->dev; | |
6566 | kfree(node_detected_dev); | |
df968c4e | 6567 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6568 | if (IS_ERR(rdev)) |
6569 | continue; | |
6570 | ||
b2d444d7 | 6571 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6572 | MD_BUG(); |
6573 | continue; | |
6574 | } | |
d0fae18f | 6575 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6576 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6577 | i_passed++; |
1da177e4 | 6578 | } |
4d936ec1 ME |
6579 | |
6580 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6581 | i_scanned, i_passed); | |
1da177e4 LT |
6582 | |
6583 | autorun_devices(part); | |
6584 | } | |
6585 | ||
fdee8ae4 | 6586 | #endif /* !MODULE */ |
1da177e4 LT |
6587 | |
6588 | static __exit void md_exit(void) | |
6589 | { | |
6590 | mddev_t *mddev; | |
6591 | struct list_head *tmp; | |
8ab5e4c1 | 6592 | |
3dbd8c2e | 6593 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 6594 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 6595 | |
3dbd8c2e | 6596 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
6597 | unregister_blkdev(mdp_major, "mdp"); |
6598 | unregister_reboot_notifier(&md_notifier); | |
6599 | unregister_sysctl_table(raid_table_header); | |
6600 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6601 | for_each_mddev(mddev, tmp) { |
1da177e4 | 6602 | export_array(mddev); |
d3374825 | 6603 | mddev->hold_active = 0; |
1da177e4 LT |
6604 | } |
6605 | } | |
6606 | ||
685784aa | 6607 | subsys_initcall(md_init); |
1da177e4 LT |
6608 | module_exit(md_exit) |
6609 | ||
f91de92e N |
6610 | static int get_ro(char *buffer, struct kernel_param *kp) |
6611 | { | |
6612 | return sprintf(buffer, "%d", start_readonly); | |
6613 | } | |
6614 | static int set_ro(const char *val, struct kernel_param *kp) | |
6615 | { | |
6616 | char *e; | |
6617 | int num = simple_strtoul(val, &e, 10); | |
6618 | if (*val && (*e == '\0' || *e == '\n')) { | |
6619 | start_readonly = num; | |
4dbcdc75 | 6620 | return 0; |
f91de92e N |
6621 | } |
6622 | return -EINVAL; | |
6623 | } | |
6624 | ||
80ca3a44 N |
6625 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6626 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6627 | |
efeb53c0 | 6628 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 6629 | |
1da177e4 LT |
6630 | EXPORT_SYMBOL(register_md_personality); |
6631 | EXPORT_SYMBOL(unregister_md_personality); | |
6632 | EXPORT_SYMBOL(md_error); | |
6633 | EXPORT_SYMBOL(md_done_sync); | |
6634 | EXPORT_SYMBOL(md_write_start); | |
6635 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6636 | EXPORT_SYMBOL(md_register_thread); |
6637 | EXPORT_SYMBOL(md_unregister_thread); | |
6638 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6639 | EXPORT_SYMBOL(md_check_recovery); |
6640 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6641 | MODULE_ALIAS("md"); |
72008652 | 6642 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |