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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
1da177e4 | 36 | #include <linux/raid/md.h> |
32a7627c | 37 | #include <linux/raid/bitmap.h> |
1da177e4 | 38 | #include <linux/sysctl.h> |
1da177e4 | 39 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
fb4d8c76 N |
42 | #include <linux/hdreg.h> |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/random.h> | |
45 | #include <linux/reboot.h> | |
32a7627c | 46 | #include <linux/file.h> |
25570727 | 47 | #include <linux/delay.h> |
32a7627c | 48 | |
1da177e4 | 49 | #define MAJOR_NR MD_MAJOR |
1da177e4 LT |
50 | |
51 | /* 63 partitions with the alternate major number (mdp) */ | |
52 | #define MdpMinorShift 6 | |
53 | ||
54 | #define DEBUG 0 | |
55 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
56 | ||
57 | ||
58 | #ifndef MODULE | |
d710e138 | 59 | static void autostart_arrays(int part); |
1da177e4 LT |
60 | #endif |
61 | ||
2604b703 | 62 | static LIST_HEAD(pers_list); |
1da177e4 LT |
63 | static DEFINE_SPINLOCK(pers_lock); |
64 | ||
5e56341d AB |
65 | static void md_print_devices(void); |
66 | ||
90b08710 BS |
67 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
68 | ||
5e56341d AB |
69 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
70 | ||
1da177e4 LT |
71 | /* |
72 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
73 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
74 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 75 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
76 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
77 | * speed limit - in case reconstruction slows down your system despite | |
78 | * idle IO detection. | |
79 | * | |
80 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 81 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
82 | */ |
83 | ||
84 | static int sysctl_speed_limit_min = 1000; | |
85 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
86 | static inline int speed_min(mddev_t *mddev) |
87 | { | |
88 | return mddev->sync_speed_min ? | |
89 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
90 | } | |
91 | ||
92 | static inline int speed_max(mddev_t *mddev) | |
93 | { | |
94 | return mddev->sync_speed_max ? | |
95 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
96 | } | |
1da177e4 LT |
97 | |
98 | static struct ctl_table_header *raid_table_header; | |
99 | ||
100 | static ctl_table raid_table[] = { | |
101 | { | |
102 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
103 | .procname = "speed_limit_min", | |
104 | .data = &sysctl_speed_limit_min, | |
105 | .maxlen = sizeof(int), | |
80ca3a44 | 106 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
107 | .proc_handler = &proc_dointvec, |
108 | }, | |
109 | { | |
110 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
111 | .procname = "speed_limit_max", | |
112 | .data = &sysctl_speed_limit_max, | |
113 | .maxlen = sizeof(int), | |
80ca3a44 | 114 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
115 | .proc_handler = &proc_dointvec, |
116 | }, | |
117 | { .ctl_name = 0 } | |
118 | }; | |
119 | ||
120 | static ctl_table raid_dir_table[] = { | |
121 | { | |
122 | .ctl_name = DEV_RAID, | |
123 | .procname = "raid", | |
124 | .maxlen = 0, | |
80ca3a44 | 125 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
126 | .child = raid_table, |
127 | }, | |
128 | { .ctl_name = 0 } | |
129 | }; | |
130 | ||
131 | static ctl_table raid_root_table[] = { | |
132 | { | |
133 | .ctl_name = CTL_DEV, | |
134 | .procname = "dev", | |
135 | .maxlen = 0, | |
136 | .mode = 0555, | |
137 | .child = raid_dir_table, | |
138 | }, | |
139 | { .ctl_name = 0 } | |
140 | }; | |
141 | ||
142 | static struct block_device_operations md_fops; | |
143 | ||
f91de92e N |
144 | static int start_readonly; |
145 | ||
d7603b7e N |
146 | /* |
147 | * We have a system wide 'event count' that is incremented | |
148 | * on any 'interesting' event, and readers of /proc/mdstat | |
149 | * can use 'poll' or 'select' to find out when the event | |
150 | * count increases. | |
151 | * | |
152 | * Events are: | |
153 | * start array, stop array, error, add device, remove device, | |
154 | * start build, activate spare | |
155 | */ | |
2989ddbd | 156 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 157 | static atomic_t md_event_count; |
29269553 | 158 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
159 | { |
160 | atomic_inc(&md_event_count); | |
161 | wake_up(&md_event_waiters); | |
162 | } | |
29269553 | 163 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 164 | |
c331eb04 N |
165 | /* Alternate version that can be called from interrupts |
166 | * when calling sysfs_notify isn't needed. | |
167 | */ | |
05381954 | 168 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
169 | { |
170 | atomic_inc(&md_event_count); | |
171 | wake_up(&md_event_waiters); | |
172 | } | |
173 | ||
1da177e4 LT |
174 | /* |
175 | * Enables to iterate over all existing md arrays | |
176 | * all_mddevs_lock protects this list. | |
177 | */ | |
178 | static LIST_HEAD(all_mddevs); | |
179 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
180 | ||
181 | ||
182 | /* | |
183 | * iterates through all used mddevs in the system. | |
184 | * We take care to grab the all_mddevs_lock whenever navigating | |
185 | * the list, and to always hold a refcount when unlocked. | |
186 | * Any code which breaks out of this loop while own | |
187 | * a reference to the current mddev and must mddev_put it. | |
188 | */ | |
29ac4aa3 | 189 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
190 | \ |
191 | for (({ spin_lock(&all_mddevs_lock); \ | |
192 | tmp = all_mddevs.next; \ | |
193 | mddev = NULL;}); \ | |
194 | ({ if (tmp != &all_mddevs) \ | |
195 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
196 | spin_unlock(&all_mddevs_lock); \ | |
197 | if (mddev) mddev_put(mddev); \ | |
198 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
199 | tmp != &all_mddevs;}); \ | |
200 | ({ spin_lock(&all_mddevs_lock); \ | |
201 | tmp = tmp->next;}) \ | |
202 | ) | |
203 | ||
204 | ||
d710e138 | 205 | static int md_fail_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 206 | { |
6712ecf8 | 207 | bio_io_error(bio); |
1da177e4 LT |
208 | return 0; |
209 | } | |
210 | ||
211 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
212 | { | |
213 | atomic_inc(&mddev->active); | |
214 | return mddev; | |
215 | } | |
216 | ||
d3374825 N |
217 | static void mddev_delayed_delete(struct work_struct *ws) |
218 | { | |
219 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
220 | kobject_del(&mddev->kobj); | |
221 | kobject_put(&mddev->kobj); | |
222 | } | |
223 | ||
1da177e4 LT |
224 | static void mddev_put(mddev_t *mddev) |
225 | { | |
226 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
227 | return; | |
d3374825 N |
228 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
229 | !mddev->hold_active) { | |
1da177e4 | 230 | list_del(&mddev->all_mddevs); |
d3374825 N |
231 | if (mddev->gendisk) { |
232 | /* we did a probe so need to clean up. | |
233 | * Call schedule_work inside the spinlock | |
234 | * so that flush_scheduled_work() after | |
235 | * mddev_find will succeed in waiting for the | |
236 | * work to be done. | |
237 | */ | |
238 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
239 | schedule_work(&mddev->del_work); | |
240 | } else | |
241 | kfree(mddev); | |
242 | } | |
243 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
244 | } |
245 | ||
246 | static mddev_t * mddev_find(dev_t unit) | |
247 | { | |
248 | mddev_t *mddev, *new = NULL; | |
249 | ||
250 | retry: | |
251 | spin_lock(&all_mddevs_lock); | |
252 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
253 | if (mddev->unit == unit) { | |
254 | mddev_get(mddev); | |
255 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 256 | kfree(new); |
1da177e4 LT |
257 | return mddev; |
258 | } | |
259 | ||
260 | if (new) { | |
261 | list_add(&new->all_mddevs, &all_mddevs); | |
d3374825 | 262 | mddev->hold_active = UNTIL_IOCTL; |
1da177e4 LT |
263 | spin_unlock(&all_mddevs_lock); |
264 | return new; | |
265 | } | |
266 | spin_unlock(&all_mddevs_lock); | |
267 | ||
9ffae0cf | 268 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
269 | if (!new) |
270 | return NULL; | |
271 | ||
1da177e4 LT |
272 | new->unit = unit; |
273 | if (MAJOR(unit) == MD_MAJOR) | |
274 | new->md_minor = MINOR(unit); | |
275 | else | |
276 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
277 | ||
df5b89b3 | 278 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
279 | INIT_LIST_HEAD(&new->disks); |
280 | INIT_LIST_HEAD(&new->all_mddevs); | |
281 | init_timer(&new->safemode_timer); | |
282 | atomic_set(&new->active, 1); | |
f2ea68cf | 283 | atomic_set(&new->openers, 0); |
06d91a5f | 284 | spin_lock_init(&new->write_lock); |
3d310eb7 | 285 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 286 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 287 | new->reshape_position = MaxSector; |
5e96ee65 | 288 | new->resync_min = 0; |
c6207277 | 289 | new->resync_max = MaxSector; |
d897dbf9 | 290 | new->level = LEVEL_NONE; |
1da177e4 | 291 | |
1da177e4 LT |
292 | goto retry; |
293 | } | |
294 | ||
295 | static inline int mddev_lock(mddev_t * mddev) | |
296 | { | |
df5b89b3 | 297 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
298 | } |
299 | ||
1da177e4 LT |
300 | static inline int mddev_trylock(mddev_t * mddev) |
301 | { | |
df5b89b3 | 302 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
303 | } |
304 | ||
305 | static inline void mddev_unlock(mddev_t * mddev) | |
306 | { | |
df5b89b3 | 307 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 308 | |
005eca5e | 309 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
310 | } |
311 | ||
2989ddbd | 312 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 313 | { |
159ec1fc | 314 | mdk_rdev_t *rdev; |
1da177e4 | 315 | |
159ec1fc | 316 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
317 | if (rdev->desc_nr == nr) |
318 | return rdev; | |
159ec1fc | 319 | |
1da177e4 LT |
320 | return NULL; |
321 | } | |
322 | ||
323 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
324 | { | |
1da177e4 LT |
325 | mdk_rdev_t *rdev; |
326 | ||
159ec1fc | 327 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
328 | if (rdev->bdev->bd_dev == dev) |
329 | return rdev; | |
159ec1fc | 330 | |
1da177e4 LT |
331 | return NULL; |
332 | } | |
333 | ||
d9d166c2 | 334 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
335 | { |
336 | struct mdk_personality *pers; | |
d9d166c2 N |
337 | list_for_each_entry(pers, &pers_list, list) { |
338 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 339 | return pers; |
d9d166c2 N |
340 | if (strcmp(pers->name, clevel)==0) |
341 | return pers; | |
342 | } | |
2604b703 N |
343 | return NULL; |
344 | } | |
345 | ||
b73df2d3 | 346 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 347 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 348 | { |
b73df2d3 AN |
349 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
350 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
351 | } |
352 | ||
e7debaa4 | 353 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 354 | { |
0f420358 | 355 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
356 | |
357 | if (chunk_size) | |
e7debaa4 AN |
358 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
359 | return num_sectors; | |
1da177e4 LT |
360 | } |
361 | ||
362 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
363 | { | |
364 | if (rdev->sb_page) | |
365 | MD_BUG(); | |
366 | ||
367 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
368 | if (!rdev->sb_page) { | |
369 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 370 | return -ENOMEM; |
1da177e4 LT |
371 | } |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static void free_disk_sb(mdk_rdev_t * rdev) | |
377 | { | |
378 | if (rdev->sb_page) { | |
2d1f3b5d | 379 | put_page(rdev->sb_page); |
1da177e4 LT |
380 | rdev->sb_loaded = 0; |
381 | rdev->sb_page = NULL; | |
0f420358 | 382 | rdev->sb_start = 0; |
1da177e4 LT |
383 | rdev->size = 0; |
384 | } | |
385 | } | |
386 | ||
387 | ||
6712ecf8 | 388 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
389 | { |
390 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 391 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 392 | |
3a0f5bbb N |
393 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
394 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
395 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
396 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 397 | md_error(mddev, rdev); |
3a0f5bbb | 398 | } |
7bfa19f2 | 399 | |
a9701a30 N |
400 | if (atomic_dec_and_test(&mddev->pending_writes)) |
401 | wake_up(&mddev->sb_wait); | |
f8b58edf | 402 | bio_put(bio); |
7bfa19f2 N |
403 | } |
404 | ||
6712ecf8 | 405 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
406 | { |
407 | struct bio *bio2 = bio->bi_private; | |
408 | mdk_rdev_t *rdev = bio2->bi_private; | |
409 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
410 | |
411 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
412 | error == -EOPNOTSUPP) { | |
413 | unsigned long flags; | |
414 | /* barriers don't appear to be supported :-( */ | |
415 | set_bit(BarriersNotsupp, &rdev->flags); | |
416 | mddev->barriers_work = 0; | |
417 | spin_lock_irqsave(&mddev->write_lock, flags); | |
418 | bio2->bi_next = mddev->biolist; | |
419 | mddev->biolist = bio2; | |
420 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
421 | wake_up(&mddev->sb_wait); | |
422 | bio_put(bio); | |
6712ecf8 N |
423 | } else { |
424 | bio_put(bio2); | |
425 | bio->bi_private = rdev; | |
426 | super_written(bio, error); | |
a9701a30 | 427 | } |
a9701a30 N |
428 | } |
429 | ||
7bfa19f2 N |
430 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
431 | sector_t sector, int size, struct page *page) | |
432 | { | |
433 | /* write first size bytes of page to sector of rdev | |
434 | * Increment mddev->pending_writes before returning | |
435 | * and decrement it on completion, waking up sb_wait | |
436 | * if zero is reached. | |
437 | * If an error occurred, call md_error | |
a9701a30 N |
438 | * |
439 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
440 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
441 | */ |
442 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 443 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
444 | |
445 | bio->bi_bdev = rdev->bdev; | |
446 | bio->bi_sector = sector; | |
447 | bio_add_page(bio, page, size, 0); | |
448 | bio->bi_private = rdev; | |
449 | bio->bi_end_io = super_written; | |
a9701a30 N |
450 | bio->bi_rw = rw; |
451 | ||
7bfa19f2 | 452 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
453 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
454 | struct bio *rbio; | |
455 | rw |= (1<<BIO_RW_BARRIER); | |
456 | rbio = bio_clone(bio, GFP_NOIO); | |
457 | rbio->bi_private = bio; | |
458 | rbio->bi_end_io = super_written_barrier; | |
459 | submit_bio(rw, rbio); | |
460 | } else | |
461 | submit_bio(rw, bio); | |
462 | } | |
463 | ||
464 | void md_super_wait(mddev_t *mddev) | |
465 | { | |
466 | /* wait for all superblock writes that were scheduled to complete. | |
467 | * if any had to be retried (due to BARRIER problems), retry them | |
468 | */ | |
469 | DEFINE_WAIT(wq); | |
470 | for(;;) { | |
471 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
472 | if (atomic_read(&mddev->pending_writes)==0) | |
473 | break; | |
474 | while (mddev->biolist) { | |
475 | struct bio *bio; | |
476 | spin_lock_irq(&mddev->write_lock); | |
477 | bio = mddev->biolist; | |
478 | mddev->biolist = bio->bi_next ; | |
479 | bio->bi_next = NULL; | |
480 | spin_unlock_irq(&mddev->write_lock); | |
481 | submit_bio(bio->bi_rw, bio); | |
482 | } | |
483 | schedule(); | |
484 | } | |
485 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
486 | } |
487 | ||
6712ecf8 | 488 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 489 | { |
1da177e4 | 490 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
491 | } |
492 | ||
a654b9d8 | 493 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
494 | struct page *page, int rw) |
495 | { | |
baaa2c51 | 496 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
497 | struct completion event; |
498 | int ret; | |
499 | ||
500 | rw |= (1 << BIO_RW_SYNC); | |
501 | ||
502 | bio->bi_bdev = bdev; | |
503 | bio->bi_sector = sector; | |
504 | bio_add_page(bio, page, size, 0); | |
505 | init_completion(&event); | |
506 | bio->bi_private = &event; | |
507 | bio->bi_end_io = bi_complete; | |
508 | submit_bio(rw, bio); | |
509 | wait_for_completion(&event); | |
510 | ||
511 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
512 | bio_put(bio); | |
513 | return ret; | |
514 | } | |
a8745db2 | 515 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 516 | |
0002b271 | 517 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
518 | { |
519 | char b[BDEVNAME_SIZE]; | |
520 | if (!rdev->sb_page) { | |
521 | MD_BUG(); | |
522 | return -EINVAL; | |
523 | } | |
524 | if (rdev->sb_loaded) | |
525 | return 0; | |
526 | ||
527 | ||
0f420358 | 528 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
529 | goto fail; |
530 | rdev->sb_loaded = 1; | |
531 | return 0; | |
532 | ||
533 | fail: | |
534 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
535 | bdevname(rdev->bdev,b)); | |
536 | return -EINVAL; | |
537 | } | |
538 | ||
539 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
540 | { | |
05710466 AN |
541 | return sb1->set_uuid0 == sb2->set_uuid0 && |
542 | sb1->set_uuid1 == sb2->set_uuid1 && | |
543 | sb1->set_uuid2 == sb2->set_uuid2 && | |
544 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
545 | } |
546 | ||
1da177e4 LT |
547 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
548 | { | |
549 | int ret; | |
550 | mdp_super_t *tmp1, *tmp2; | |
551 | ||
552 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
553 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
554 | ||
555 | if (!tmp1 || !tmp2) { | |
556 | ret = 0; | |
35020f1a | 557 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
558 | goto abort; |
559 | } | |
560 | ||
561 | *tmp1 = *sb1; | |
562 | *tmp2 = *sb2; | |
563 | ||
564 | /* | |
565 | * nr_disks is not constant | |
566 | */ | |
567 | tmp1->nr_disks = 0; | |
568 | tmp2->nr_disks = 0; | |
569 | ||
ce0c8e05 | 570 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 571 | abort: |
990a8baf JJ |
572 | kfree(tmp1); |
573 | kfree(tmp2); | |
1da177e4 LT |
574 | return ret; |
575 | } | |
576 | ||
4d167f09 N |
577 | |
578 | static u32 md_csum_fold(u32 csum) | |
579 | { | |
580 | csum = (csum & 0xffff) + (csum >> 16); | |
581 | return (csum & 0xffff) + (csum >> 16); | |
582 | } | |
583 | ||
1da177e4 LT |
584 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
585 | { | |
4d167f09 N |
586 | u64 newcsum = 0; |
587 | u32 *sb32 = (u32*)sb; | |
588 | int i; | |
1da177e4 LT |
589 | unsigned int disk_csum, csum; |
590 | ||
591 | disk_csum = sb->sb_csum; | |
592 | sb->sb_csum = 0; | |
4d167f09 N |
593 | |
594 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
595 | newcsum += sb32[i]; | |
596 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
597 | ||
598 | ||
599 | #ifdef CONFIG_ALPHA | |
600 | /* This used to use csum_partial, which was wrong for several | |
601 | * reasons including that different results are returned on | |
602 | * different architectures. It isn't critical that we get exactly | |
603 | * the same return value as before (we always csum_fold before | |
604 | * testing, and that removes any differences). However as we | |
605 | * know that csum_partial always returned a 16bit value on | |
606 | * alphas, do a fold to maximise conformity to previous behaviour. | |
607 | */ | |
608 | sb->sb_csum = md_csum_fold(disk_csum); | |
609 | #else | |
1da177e4 | 610 | sb->sb_csum = disk_csum; |
4d167f09 | 611 | #endif |
1da177e4 LT |
612 | return csum; |
613 | } | |
614 | ||
615 | ||
616 | /* | |
617 | * Handle superblock details. | |
618 | * We want to be able to handle multiple superblock formats | |
619 | * so we have a common interface to them all, and an array of | |
620 | * different handlers. | |
621 | * We rely on user-space to write the initial superblock, and support | |
622 | * reading and updating of superblocks. | |
623 | * Interface methods are: | |
624 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
625 | * loads and validates a superblock on dev. | |
626 | * if refdev != NULL, compare superblocks on both devices | |
627 | * Return: | |
628 | * 0 - dev has a superblock that is compatible with refdev | |
629 | * 1 - dev has a superblock that is compatible and newer than refdev | |
630 | * so dev should be used as the refdev in future | |
631 | * -EINVAL superblock incompatible or invalid | |
632 | * -othererror e.g. -EIO | |
633 | * | |
634 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
635 | * Verify that dev is acceptable into mddev. | |
636 | * The first time, mddev->raid_disks will be 0, and data from | |
637 | * dev should be merged in. Subsequent calls check that dev | |
638 | * is new enough. Return 0 or -EINVAL | |
639 | * | |
640 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
641 | * Update the superblock for rdev with data in mddev | |
642 | * This does not write to disc. | |
643 | * | |
644 | */ | |
645 | ||
646 | struct super_type { | |
0cd17fec CW |
647 | char *name; |
648 | struct module *owner; | |
649 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
650 | int minor_version); | |
651 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
652 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
653 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 654 | sector_t num_sectors); |
1da177e4 LT |
655 | }; |
656 | ||
657 | /* | |
658 | * load_super for 0.90.0 | |
659 | */ | |
660 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
661 | { | |
662 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
663 | mdp_super_t *sb; | |
664 | int ret; | |
1da177e4 LT |
665 | |
666 | /* | |
0f420358 | 667 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
668 | * it's at the end of the disk. |
669 | * | |
670 | * It also happens to be a multiple of 4Kb. | |
671 | */ | |
0f420358 | 672 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 673 | |
0002b271 | 674 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
675 | if (ret) return ret; |
676 | ||
677 | ret = -EINVAL; | |
678 | ||
679 | bdevname(rdev->bdev, b); | |
680 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
681 | ||
682 | if (sb->md_magic != MD_SB_MAGIC) { | |
683 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
684 | b); | |
685 | goto abort; | |
686 | } | |
687 | ||
688 | if (sb->major_version != 0 || | |
f6705578 N |
689 | sb->minor_version < 90 || |
690 | sb->minor_version > 91) { | |
1da177e4 LT |
691 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
692 | sb->major_version, sb->minor_version, | |
693 | b); | |
694 | goto abort; | |
695 | } | |
696 | ||
697 | if (sb->raid_disks <= 0) | |
698 | goto abort; | |
699 | ||
4d167f09 | 700 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
701 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
702 | b); | |
703 | goto abort; | |
704 | } | |
705 | ||
706 | rdev->preferred_minor = sb->md_minor; | |
707 | rdev->data_offset = 0; | |
0002b271 | 708 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 709 | |
e11e93fa N |
710 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
711 | if (sb->level != 1 && sb->level != 4 | |
712 | && sb->level != 5 && sb->level != 6 | |
713 | && sb->level != 10) { | |
714 | /* FIXME use a better test */ | |
715 | printk(KERN_WARNING | |
716 | "md: bitmaps not supported for this level.\n"); | |
717 | goto abort; | |
718 | } | |
719 | } | |
720 | ||
1da177e4 LT |
721 | if (sb->level == LEVEL_MULTIPATH) |
722 | rdev->desc_nr = -1; | |
723 | else | |
724 | rdev->desc_nr = sb->this_disk.number; | |
725 | ||
9a7b2b0f | 726 | if (!refdev) { |
1da177e4 | 727 | ret = 1; |
9a7b2b0f | 728 | } else { |
1da177e4 LT |
729 | __u64 ev1, ev2; |
730 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
731 | if (!uuid_equal(refsb, sb)) { | |
732 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
733 | b, bdevname(refdev->bdev,b2)); | |
734 | goto abort; | |
735 | } | |
736 | if (!sb_equal(refsb, sb)) { | |
737 | printk(KERN_WARNING "md: %s has same UUID" | |
738 | " but different superblock to %s\n", | |
739 | b, bdevname(refdev->bdev, b2)); | |
740 | goto abort; | |
741 | } | |
742 | ev1 = md_event(sb); | |
743 | ev2 = md_event(refsb); | |
744 | if (ev1 > ev2) | |
745 | ret = 1; | |
746 | else | |
747 | ret = 0; | |
748 | } | |
e7debaa4 | 749 | rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2; |
1da177e4 | 750 | |
2bf071bf N |
751 | if (rdev->size < sb->size && sb->level > 1) |
752 | /* "this cannot possibly happen" ... */ | |
753 | ret = -EINVAL; | |
754 | ||
1da177e4 LT |
755 | abort: |
756 | return ret; | |
757 | } | |
758 | ||
759 | /* | |
760 | * validate_super for 0.90.0 | |
761 | */ | |
762 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
763 | { | |
764 | mdp_disk_t *desc; | |
765 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 766 | __u64 ev1 = md_event(sb); |
1da177e4 | 767 | |
41158c7e | 768 | rdev->raid_disk = -1; |
c5d79adb N |
769 | clear_bit(Faulty, &rdev->flags); |
770 | clear_bit(In_sync, &rdev->flags); | |
771 | clear_bit(WriteMostly, &rdev->flags); | |
772 | clear_bit(BarriersNotsupp, &rdev->flags); | |
773 | ||
1da177e4 LT |
774 | if (mddev->raid_disks == 0) { |
775 | mddev->major_version = 0; | |
776 | mddev->minor_version = sb->minor_version; | |
777 | mddev->patch_version = sb->patch_version; | |
e691063a | 778 | mddev->external = 0; |
1da177e4 LT |
779 | mddev->chunk_size = sb->chunk_size; |
780 | mddev->ctime = sb->ctime; | |
781 | mddev->utime = sb->utime; | |
782 | mddev->level = sb->level; | |
d9d166c2 | 783 | mddev->clevel[0] = 0; |
1da177e4 LT |
784 | mddev->layout = sb->layout; |
785 | mddev->raid_disks = sb->raid_disks; | |
786 | mddev->size = sb->size; | |
07d84d10 | 787 | mddev->events = ev1; |
9223214e | 788 | mddev->bitmap_offset = 0; |
36fa3063 | 789 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 790 | |
f6705578 N |
791 | if (mddev->minor_version >= 91) { |
792 | mddev->reshape_position = sb->reshape_position; | |
793 | mddev->delta_disks = sb->delta_disks; | |
794 | mddev->new_level = sb->new_level; | |
795 | mddev->new_layout = sb->new_layout; | |
796 | mddev->new_chunk = sb->new_chunk; | |
797 | } else { | |
798 | mddev->reshape_position = MaxSector; | |
799 | mddev->delta_disks = 0; | |
800 | mddev->new_level = mddev->level; | |
801 | mddev->new_layout = mddev->layout; | |
802 | mddev->new_chunk = mddev->chunk_size; | |
803 | } | |
804 | ||
1da177e4 LT |
805 | if (sb->state & (1<<MD_SB_CLEAN)) |
806 | mddev->recovery_cp = MaxSector; | |
807 | else { | |
808 | if (sb->events_hi == sb->cp_events_hi && | |
809 | sb->events_lo == sb->cp_events_lo) { | |
810 | mddev->recovery_cp = sb->recovery_cp; | |
811 | } else | |
812 | mddev->recovery_cp = 0; | |
813 | } | |
814 | ||
815 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
816 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
817 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
818 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
819 | ||
820 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
821 | |
822 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 823 | mddev->bitmap_file == NULL) |
36fa3063 | 824 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 825 | |
41158c7e N |
826 | } else if (mddev->pers == NULL) { |
827 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
828 | ++ev1; |
829 | if (ev1 < mddev->events) | |
830 | return -EINVAL; | |
41158c7e N |
831 | } else if (mddev->bitmap) { |
832 | /* if adding to array with a bitmap, then we can accept an | |
833 | * older device ... but not too old. | |
834 | */ | |
41158c7e N |
835 | if (ev1 < mddev->bitmap->events_cleared) |
836 | return 0; | |
07d84d10 N |
837 | } else { |
838 | if (ev1 < mddev->events) | |
839 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
840 | return 0; | |
841 | } | |
41158c7e | 842 | |
1da177e4 | 843 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
844 | desc = sb->disks + rdev->desc_nr; |
845 | ||
846 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 847 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
848 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
849 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 850 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
851 | rdev->raid_disk = desc->raid_disk; |
852 | } | |
8ddf9efe N |
853 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
854 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 855 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 856 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
857 | return 0; |
858 | } | |
859 | ||
860 | /* | |
861 | * sync_super for 0.90.0 | |
862 | */ | |
863 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
864 | { | |
865 | mdp_super_t *sb; | |
1da177e4 LT |
866 | mdk_rdev_t *rdev2; |
867 | int next_spare = mddev->raid_disks; | |
19133a42 | 868 | |
1da177e4 LT |
869 | |
870 | /* make rdev->sb match mddev data.. | |
871 | * | |
872 | * 1/ zero out disks | |
873 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
874 | * 3/ any empty disks < next_spare become removed | |
875 | * | |
876 | * disks[0] gets initialised to REMOVED because | |
877 | * we cannot be sure from other fields if it has | |
878 | * been initialised or not. | |
879 | */ | |
880 | int i; | |
881 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
882 | ||
61181565 N |
883 | rdev->sb_size = MD_SB_BYTES; |
884 | ||
1da177e4 LT |
885 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
886 | ||
887 | memset(sb, 0, sizeof(*sb)); | |
888 | ||
889 | sb->md_magic = MD_SB_MAGIC; | |
890 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
891 | sb->patch_version = mddev->patch_version; |
892 | sb->gvalid_words = 0; /* ignored */ | |
893 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
894 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
895 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
896 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
897 | ||
898 | sb->ctime = mddev->ctime; | |
899 | sb->level = mddev->level; | |
900 | sb->size = mddev->size; | |
901 | sb->raid_disks = mddev->raid_disks; | |
902 | sb->md_minor = mddev->md_minor; | |
e691063a | 903 | sb->not_persistent = 0; |
1da177e4 LT |
904 | sb->utime = mddev->utime; |
905 | sb->state = 0; | |
906 | sb->events_hi = (mddev->events>>32); | |
907 | sb->events_lo = (u32)mddev->events; | |
908 | ||
f6705578 N |
909 | if (mddev->reshape_position == MaxSector) |
910 | sb->minor_version = 90; | |
911 | else { | |
912 | sb->minor_version = 91; | |
913 | sb->reshape_position = mddev->reshape_position; | |
914 | sb->new_level = mddev->new_level; | |
915 | sb->delta_disks = mddev->delta_disks; | |
916 | sb->new_layout = mddev->new_layout; | |
917 | sb->new_chunk = mddev->new_chunk; | |
918 | } | |
919 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
920 | if (mddev->in_sync) |
921 | { | |
922 | sb->recovery_cp = mddev->recovery_cp; | |
923 | sb->cp_events_hi = (mddev->events>>32); | |
924 | sb->cp_events_lo = (u32)mddev->events; | |
925 | if (mddev->recovery_cp == MaxSector) | |
926 | sb->state = (1<< MD_SB_CLEAN); | |
927 | } else | |
928 | sb->recovery_cp = 0; | |
929 | ||
930 | sb->layout = mddev->layout; | |
931 | sb->chunk_size = mddev->chunk_size; | |
932 | ||
a654b9d8 N |
933 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
934 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
935 | ||
1da177e4 | 936 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 937 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 938 | mdp_disk_t *d; |
86e6ffdd | 939 | int desc_nr; |
b2d444d7 N |
940 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
941 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 942 | desc_nr = rdev2->raid_disk; |
1da177e4 | 943 | else |
86e6ffdd | 944 | desc_nr = next_spare++; |
19133a42 | 945 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
946 | d = &sb->disks[rdev2->desc_nr]; |
947 | nr_disks++; | |
948 | d->number = rdev2->desc_nr; | |
949 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
950 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
951 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
952 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
953 | d->raid_disk = rdev2->raid_disk; |
954 | else | |
955 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 956 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 957 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 958 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
959 | d->state = (1<<MD_DISK_ACTIVE); |
960 | d->state |= (1<<MD_DISK_SYNC); | |
961 | active++; | |
962 | working++; | |
963 | } else { | |
964 | d->state = 0; | |
965 | spare++; | |
966 | working++; | |
967 | } | |
8ddf9efe N |
968 | if (test_bit(WriteMostly, &rdev2->flags)) |
969 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 970 | } |
1da177e4 LT |
971 | /* now set the "removed" and "faulty" bits on any missing devices */ |
972 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
973 | mdp_disk_t *d = &sb->disks[i]; | |
974 | if (d->state == 0 && d->number == 0) { | |
975 | d->number = i; | |
976 | d->raid_disk = i; | |
977 | d->state = (1<<MD_DISK_REMOVED); | |
978 | d->state |= (1<<MD_DISK_FAULTY); | |
979 | failed++; | |
980 | } | |
981 | } | |
982 | sb->nr_disks = nr_disks; | |
983 | sb->active_disks = active; | |
984 | sb->working_disks = working; | |
985 | sb->failed_disks = failed; | |
986 | sb->spare_disks = spare; | |
987 | ||
988 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
989 | sb->sb_csum = calc_sb_csum(sb); | |
990 | } | |
991 | ||
0cd17fec CW |
992 | /* |
993 | * rdev_size_change for 0.90.0 | |
994 | */ | |
995 | static unsigned long long | |
15f4a5fd | 996 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 997 | { |
15f4a5fd | 998 | if (num_sectors && num_sectors < rdev->mddev->size * 2) |
0cd17fec | 999 | return 0; /* component must fit device */ |
0cd17fec CW |
1000 | if (rdev->mddev->bitmap_offset) |
1001 | return 0; /* can't move bitmap */ | |
0f420358 | 1002 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1003 | if (!num_sectors || num_sectors > rdev->sb_start) |
1004 | num_sectors = rdev->sb_start; | |
0f420358 | 1005 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1006 | rdev->sb_page); |
1007 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1008 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1009 | } |
1010 | ||
1011 | ||
1da177e4 LT |
1012 | /* |
1013 | * version 1 superblock | |
1014 | */ | |
1015 | ||
1c05b4bc | 1016 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1017 | { |
1c05b4bc N |
1018 | __le32 disk_csum; |
1019 | u32 csum; | |
1da177e4 LT |
1020 | unsigned long long newcsum; |
1021 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1022 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1023 | int i; |
1024 | ||
1025 | disk_csum = sb->sb_csum; | |
1026 | sb->sb_csum = 0; | |
1027 | newcsum = 0; | |
1028 | for (i=0; size>=4; size -= 4 ) | |
1029 | newcsum += le32_to_cpu(*isuper++); | |
1030 | ||
1031 | if (size == 2) | |
1c05b4bc | 1032 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1033 | |
1034 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1035 | sb->sb_csum = disk_csum; | |
1036 | return cpu_to_le32(csum); | |
1037 | } | |
1038 | ||
1039 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1040 | { | |
1041 | struct mdp_superblock_1 *sb; | |
1042 | int ret; | |
0f420358 | 1043 | sector_t sb_start; |
1da177e4 | 1044 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1045 | int bmask; |
1da177e4 LT |
1046 | |
1047 | /* | |
0f420358 | 1048 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1049 | * It is always aligned to a 4K boundary and |
1050 | * depeding on minor_version, it can be: | |
1051 | * 0: At least 8K, but less than 12K, from end of device | |
1052 | * 1: At start of device | |
1053 | * 2: 4K from start of device. | |
1054 | */ | |
1055 | switch(minor_version) { | |
1056 | case 0: | |
0f420358 AN |
1057 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1058 | sb_start -= 8*2; | |
1059 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1060 | break; |
1061 | case 1: | |
0f420358 | 1062 | sb_start = 0; |
1da177e4 LT |
1063 | break; |
1064 | case 2: | |
0f420358 | 1065 | sb_start = 8; |
1da177e4 LT |
1066 | break; |
1067 | default: | |
1068 | return -EINVAL; | |
1069 | } | |
0f420358 | 1070 | rdev->sb_start = sb_start; |
1da177e4 | 1071 | |
0002b271 N |
1072 | /* superblock is rarely larger than 1K, but it can be larger, |
1073 | * and it is safe to read 4k, so we do that | |
1074 | */ | |
1075 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1076 | if (ret) return ret; |
1077 | ||
1078 | ||
1079 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1080 | ||
1081 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1082 | sb->major_version != cpu_to_le32(1) || | |
1083 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1084 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1085 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1086 | return -EINVAL; |
1087 | ||
1088 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1089 | printk("md: invalid superblock checksum on %s\n", | |
1090 | bdevname(rdev->bdev,b)); | |
1091 | return -EINVAL; | |
1092 | } | |
1093 | if (le64_to_cpu(sb->data_size) < 10) { | |
1094 | printk("md: data_size too small on %s\n", | |
1095 | bdevname(rdev->bdev,b)); | |
1096 | return -EINVAL; | |
1097 | } | |
e11e93fa N |
1098 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1099 | if (sb->level != cpu_to_le32(1) && | |
1100 | sb->level != cpu_to_le32(4) && | |
1101 | sb->level != cpu_to_le32(5) && | |
1102 | sb->level != cpu_to_le32(6) && | |
1103 | sb->level != cpu_to_le32(10)) { | |
1104 | printk(KERN_WARNING | |
1105 | "md: bitmaps not supported for this level.\n"); | |
1106 | return -EINVAL; | |
1107 | } | |
1108 | } | |
1109 | ||
1da177e4 LT |
1110 | rdev->preferred_minor = 0xffff; |
1111 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1112 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1113 | |
0002b271 | 1114 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1115 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1116 | if (rdev->sb_size & bmask) |
a1801f85 N |
1117 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1118 | ||
1119 | if (minor_version | |
0f420358 | 1120 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1121 | return -EINVAL; |
0002b271 | 1122 | |
31b65a0d N |
1123 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1124 | rdev->desc_nr = -1; | |
1125 | else | |
1126 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1127 | ||
9a7b2b0f | 1128 | if (!refdev) { |
8ed75463 | 1129 | ret = 1; |
9a7b2b0f | 1130 | } else { |
1da177e4 LT |
1131 | __u64 ev1, ev2; |
1132 | struct mdp_superblock_1 *refsb = | |
1133 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1134 | ||
1135 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1136 | sb->level != refsb->level || | |
1137 | sb->layout != refsb->layout || | |
1138 | sb->chunksize != refsb->chunksize) { | |
1139 | printk(KERN_WARNING "md: %s has strangely different" | |
1140 | " superblock to %s\n", | |
1141 | bdevname(rdev->bdev,b), | |
1142 | bdevname(refdev->bdev,b2)); | |
1143 | return -EINVAL; | |
1144 | } | |
1145 | ev1 = le64_to_cpu(sb->events); | |
1146 | ev2 = le64_to_cpu(refsb->events); | |
1147 | ||
1148 | if (ev1 > ev2) | |
8ed75463 N |
1149 | ret = 1; |
1150 | else | |
1151 | ret = 0; | |
1da177e4 | 1152 | } |
a1801f85 | 1153 | if (minor_version) |
1da177e4 LT |
1154 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; |
1155 | else | |
0f420358 | 1156 | rdev->size = rdev->sb_start / 2; |
1da177e4 LT |
1157 | if (rdev->size < le64_to_cpu(sb->data_size)/2) |
1158 | return -EINVAL; | |
1159 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1160 | if (le32_to_cpu(sb->chunksize)) | |
1161 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf | 1162 | |
1c05b4bc | 1163 | if (le64_to_cpu(sb->size) > rdev->size*2) |
2bf071bf | 1164 | return -EINVAL; |
8ed75463 | 1165 | return ret; |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1169 | { | |
1170 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1171 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1172 | |
41158c7e | 1173 | rdev->raid_disk = -1; |
c5d79adb N |
1174 | clear_bit(Faulty, &rdev->flags); |
1175 | clear_bit(In_sync, &rdev->flags); | |
1176 | clear_bit(WriteMostly, &rdev->flags); | |
1177 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1178 | ||
1da177e4 LT |
1179 | if (mddev->raid_disks == 0) { |
1180 | mddev->major_version = 1; | |
1181 | mddev->patch_version = 0; | |
e691063a | 1182 | mddev->external = 0; |
1da177e4 LT |
1183 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1184 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1185 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1186 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1187 | mddev->clevel[0] = 0; |
1da177e4 LT |
1188 | mddev->layout = le32_to_cpu(sb->layout); |
1189 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1190 | mddev->size = le64_to_cpu(sb->size)/2; | |
07d84d10 | 1191 | mddev->events = ev1; |
9223214e | 1192 | mddev->bitmap_offset = 0; |
29fc7e3e | 1193 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1194 | |
1195 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1196 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1197 | ||
1198 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1199 | |
71c0805c | 1200 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1201 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1202 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1203 | |
f6705578 N |
1204 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1205 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1206 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1207 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1208 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1209 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1210 | } else { | |
1211 | mddev->reshape_position = MaxSector; | |
1212 | mddev->delta_disks = 0; | |
1213 | mddev->new_level = mddev->level; | |
1214 | mddev->new_layout = mddev->layout; | |
1215 | mddev->new_chunk = mddev->chunk_size; | |
1216 | } | |
1217 | ||
41158c7e N |
1218 | } else if (mddev->pers == NULL) { |
1219 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1220 | ++ev1; |
1221 | if (ev1 < mddev->events) | |
1222 | return -EINVAL; | |
41158c7e N |
1223 | } else if (mddev->bitmap) { |
1224 | /* If adding to array with a bitmap, then we can accept an | |
1225 | * older device, but not too old. | |
1226 | */ | |
41158c7e N |
1227 | if (ev1 < mddev->bitmap->events_cleared) |
1228 | return 0; | |
07d84d10 N |
1229 | } else { |
1230 | if (ev1 < mddev->events) | |
1231 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1232 | return 0; | |
1233 | } | |
1da177e4 LT |
1234 | if (mddev->level != LEVEL_MULTIPATH) { |
1235 | int role; | |
1da177e4 LT |
1236 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1237 | switch(role) { | |
1238 | case 0xffff: /* spare */ | |
1da177e4 LT |
1239 | break; |
1240 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1241 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1242 | break; |
1243 | default: | |
5fd6c1dc N |
1244 | if ((le32_to_cpu(sb->feature_map) & |
1245 | MD_FEATURE_RECOVERY_OFFSET)) | |
1246 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1247 | else | |
1248 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1249 | rdev->raid_disk = role; |
1250 | break; | |
1251 | } | |
8ddf9efe N |
1252 | if (sb->devflags & WriteMostly1) |
1253 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1254 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1255 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1256 | |
1da177e4 LT |
1257 | return 0; |
1258 | } | |
1259 | ||
1260 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1261 | { | |
1262 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1263 | mdk_rdev_t *rdev2; |
1264 | int max_dev, i; | |
1265 | /* make rdev->sb match mddev and rdev data. */ | |
1266 | ||
1267 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1268 | ||
1269 | sb->feature_map = 0; | |
1270 | sb->pad0 = 0; | |
5fd6c1dc | 1271 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1272 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1273 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1274 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1275 | ||
1276 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1277 | sb->events = cpu_to_le64(mddev->events); | |
1278 | if (mddev->in_sync) | |
1279 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1280 | else | |
1281 | sb->resync_offset = cpu_to_le64(0); | |
1282 | ||
1c05b4bc | 1283 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1284 | |
f0ca340c | 1285 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1286 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1287 | |
a654b9d8 N |
1288 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1289 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1290 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1291 | } |
5fd6c1dc N |
1292 | |
1293 | if (rdev->raid_disk >= 0 && | |
1294 | !test_bit(In_sync, &rdev->flags) && | |
1295 | rdev->recovery_offset > 0) { | |
1296 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1297 | sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1298 | } | |
1299 | ||
f6705578 N |
1300 | if (mddev->reshape_position != MaxSector) { |
1301 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1302 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1303 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1304 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1305 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1306 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1307 | } | |
a654b9d8 | 1308 | |
1da177e4 | 1309 | max_dev = 0; |
159ec1fc | 1310 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1311 | if (rdev2->desc_nr+1 > max_dev) |
1312 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1313 | |
1314 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1315 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1316 | for (i=0; i<max_dev;i++) |
1317 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1318 | ||
159ec1fc | 1319 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1320 | i = rdev2->desc_nr; |
b2d444d7 | 1321 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1322 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1323 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1324 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1325 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1326 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1327 | else |
1328 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1329 | } | |
1330 | ||
1da177e4 LT |
1331 | sb->sb_csum = calc_sb_1_csum(sb); |
1332 | } | |
1333 | ||
0cd17fec | 1334 | static unsigned long long |
15f4a5fd | 1335 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1336 | { |
1337 | struct mdp_superblock_1 *sb; | |
15f4a5fd AN |
1338 | sector_t max_sectors; |
1339 | if (num_sectors && num_sectors < rdev->mddev->size * 2) | |
0cd17fec | 1340 | return 0; /* component must fit device */ |
0f420358 | 1341 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1342 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1343 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1344 | max_sectors -= rdev->data_offset; | |
1345 | if (!num_sectors || num_sectors > max_sectors) | |
1346 | num_sectors = max_sectors; | |
0cd17fec CW |
1347 | } else if (rdev->mddev->bitmap_offset) { |
1348 | /* minor version 0 with bitmap we can't move */ | |
1349 | return 0; | |
1350 | } else { | |
1351 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1352 | sector_t sb_start; |
1353 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1354 | sb_start &= ~(sector_t)(4*2 - 1); | |
15f4a5fd AN |
1355 | max_sectors = rdev->size * 2 + sb_start - rdev->sb_start; |
1356 | if (!num_sectors || num_sectors > max_sectors) | |
1357 | num_sectors = max_sectors; | |
0f420358 | 1358 | rdev->sb_start = sb_start; |
0cd17fec CW |
1359 | } |
1360 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1361 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1362 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1363 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1364 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1365 | rdev->sb_page); |
1366 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1367 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1368 | } |
1da177e4 | 1369 | |
75c96f85 | 1370 | static struct super_type super_types[] = { |
1da177e4 LT |
1371 | [0] = { |
1372 | .name = "0.90.0", | |
1373 | .owner = THIS_MODULE, | |
0cd17fec CW |
1374 | .load_super = super_90_load, |
1375 | .validate_super = super_90_validate, | |
1376 | .sync_super = super_90_sync, | |
1377 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1378 | }, |
1379 | [1] = { | |
1380 | .name = "md-1", | |
1381 | .owner = THIS_MODULE, | |
0cd17fec CW |
1382 | .load_super = super_1_load, |
1383 | .validate_super = super_1_validate, | |
1384 | .sync_super = super_1_sync, | |
1385 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1386 | }, |
1387 | }; | |
1da177e4 LT |
1388 | |
1389 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1390 | { | |
7dd5e7c3 | 1391 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1392 | |
4b80991c N |
1393 | rcu_read_lock(); |
1394 | rdev_for_each_rcu(rdev, mddev1) | |
1395 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1396 | if (rdev->bdev->bd_contains == |
4b80991c N |
1397 | rdev2->bdev->bd_contains) { |
1398 | rcu_read_unlock(); | |
7dd5e7c3 | 1399 | return 1; |
4b80991c N |
1400 | } |
1401 | rcu_read_unlock(); | |
1da177e4 LT |
1402 | return 0; |
1403 | } | |
1404 | ||
1405 | static LIST_HEAD(pending_raid_disks); | |
1406 | ||
1407 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1408 | { | |
7dd5e7c3 | 1409 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1410 | struct kobject *ko; |
1edf80d3 | 1411 | char *s; |
5e55e2f5 | 1412 | int err; |
1da177e4 LT |
1413 | |
1414 | if (rdev->mddev) { | |
1415 | MD_BUG(); | |
1416 | return -EINVAL; | |
1417 | } | |
11e2ede0 DW |
1418 | |
1419 | /* prevent duplicates */ | |
1420 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1421 | return -EEXIST; | |
1422 | ||
2bf071bf N |
1423 | /* make sure rdev->size exceeds mddev->size */ |
1424 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
a778b73f N |
1425 | if (mddev->pers) { |
1426 | /* Cannot change size, so fail | |
1427 | * If mddev->level <= 0, then we don't care | |
1428 | * about aligning sizes (e.g. linear) | |
1429 | */ | |
1430 | if (mddev->level > 0) | |
1431 | return -ENOSPC; | |
1432 | } else | |
2bf071bf N |
1433 | mddev->size = rdev->size; |
1434 | } | |
1da177e4 LT |
1435 | |
1436 | /* Verify rdev->desc_nr is unique. | |
1437 | * If it is -1, assign a free number, else | |
1438 | * check number is not in use | |
1439 | */ | |
1440 | if (rdev->desc_nr < 0) { | |
1441 | int choice = 0; | |
1442 | if (mddev->pers) choice = mddev->raid_disks; | |
1443 | while (find_rdev_nr(mddev, choice)) | |
1444 | choice++; | |
1445 | rdev->desc_nr = choice; | |
1446 | } else { | |
1447 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1448 | return -EBUSY; | |
1449 | } | |
19133a42 | 1450 | bdevname(rdev->bdev,b); |
649316b2 | 1451 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1452 | *s = '!'; |
649316b2 | 1453 | |
1da177e4 | 1454 | rdev->mddev = mddev; |
19133a42 | 1455 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1456 | |
b2d6db58 | 1457 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1458 | goto fail; |
86e6ffdd | 1459 | |
0762b8bd | 1460 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1461 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1462 | kobject_del(&rdev->kobj); | |
1463 | goto fail; | |
1464 | } | |
3c0ee63a N |
1465 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1466 | ||
4b80991c | 1467 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1468 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
1da177e4 | 1469 | return 0; |
5e55e2f5 N |
1470 | |
1471 | fail: | |
1472 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1473 | b, mdname(mddev)); | |
1474 | return err; | |
1da177e4 LT |
1475 | } |
1476 | ||
177a99b2 | 1477 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1478 | { |
1479 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1480 | kobject_del(&rdev->kobj); | |
177a99b2 | 1481 | kobject_put(&rdev->kobj); |
5792a285 N |
1482 | } |
1483 | ||
1da177e4 LT |
1484 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1485 | { | |
1486 | char b[BDEVNAME_SIZE]; | |
1487 | if (!rdev->mddev) { | |
1488 | MD_BUG(); | |
1489 | return; | |
1490 | } | |
5463c790 | 1491 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1492 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1493 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1494 | rdev->mddev = NULL; | |
86e6ffdd | 1495 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1496 | sysfs_put(rdev->sysfs_state); |
1497 | rdev->sysfs_state = NULL; | |
5792a285 | 1498 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1499 | * writing to 'remove' to "dev/state". We also need |
1500 | * to delay it due to rcu usage. | |
5792a285 | 1501 | */ |
4b80991c | 1502 | synchronize_rcu(); |
177a99b2 N |
1503 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1504 | kobject_get(&rdev->kobj); | |
5792a285 | 1505 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1506 | } |
1507 | ||
1508 | /* | |
1509 | * prevent the device from being mounted, repartitioned or | |
1510 | * otherwise reused by a RAID array (or any other kernel | |
1511 | * subsystem), by bd_claiming the device. | |
1512 | */ | |
c5d79adb | 1513 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1514 | { |
1515 | int err = 0; | |
1516 | struct block_device *bdev; | |
1517 | char b[BDEVNAME_SIZE]; | |
1518 | ||
2e7b651d | 1519 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1520 | if (IS_ERR(bdev)) { |
1521 | printk(KERN_ERR "md: could not open %s.\n", | |
1522 | __bdevname(dev, b)); | |
1523 | return PTR_ERR(bdev); | |
1524 | } | |
c5d79adb | 1525 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1526 | if (err) { |
1527 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1528 | bdevname(bdev, b)); | |
9a1c3542 | 1529 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1530 | return err; |
1531 | } | |
c5d79adb N |
1532 | if (!shared) |
1533 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1534 | rdev->bdev = bdev; |
1535 | return err; | |
1536 | } | |
1537 | ||
1538 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1539 | { | |
1540 | struct block_device *bdev = rdev->bdev; | |
1541 | rdev->bdev = NULL; | |
1542 | if (!bdev) | |
1543 | MD_BUG(); | |
1544 | bd_release(bdev); | |
9a1c3542 | 1545 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1546 | } |
1547 | ||
1548 | void md_autodetect_dev(dev_t dev); | |
1549 | ||
1550 | static void export_rdev(mdk_rdev_t * rdev) | |
1551 | { | |
1552 | char b[BDEVNAME_SIZE]; | |
1553 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1554 | bdevname(rdev->bdev,b)); | |
1555 | if (rdev->mddev) | |
1556 | MD_BUG(); | |
1557 | free_disk_sb(rdev); | |
1da177e4 | 1558 | #ifndef MODULE |
d0fae18f N |
1559 | if (test_bit(AutoDetected, &rdev->flags)) |
1560 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1561 | #endif |
1562 | unlock_rdev(rdev); | |
86e6ffdd | 1563 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1564 | } |
1565 | ||
1566 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1567 | { | |
1568 | unbind_rdev_from_array(rdev); | |
1569 | export_rdev(rdev); | |
1570 | } | |
1571 | ||
1572 | static void export_array(mddev_t *mddev) | |
1573 | { | |
159ec1fc | 1574 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1575 | |
d089c6af | 1576 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1577 | if (!rdev->mddev) { |
1578 | MD_BUG(); | |
1579 | continue; | |
1580 | } | |
1581 | kick_rdev_from_array(rdev); | |
1582 | } | |
1583 | if (!list_empty(&mddev->disks)) | |
1584 | MD_BUG(); | |
1585 | mddev->raid_disks = 0; | |
1586 | mddev->major_version = 0; | |
1587 | } | |
1588 | ||
1589 | static void print_desc(mdp_disk_t *desc) | |
1590 | { | |
1591 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1592 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1593 | } | |
1594 | ||
cd2ac932 | 1595 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1596 | { |
1597 | int i; | |
1598 | ||
1599 | printk(KERN_INFO | |
1600 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1601 | sb->major_version, sb->minor_version, sb->patch_version, | |
1602 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1603 | sb->ctime); | |
1604 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1605 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1606 | sb->md_minor, sb->layout, sb->chunk_size); | |
1607 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1608 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1609 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1610 | sb->failed_disks, sb->spare_disks, | |
1611 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1612 | ||
1613 | printk(KERN_INFO); | |
1614 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1615 | mdp_disk_t *desc; | |
1616 | ||
1617 | desc = sb->disks + i; | |
1618 | if (desc->number || desc->major || desc->minor || | |
1619 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1620 | printk(" D %2d: ", i); | |
1621 | print_desc(desc); | |
1622 | } | |
1623 | } | |
1624 | printk(KERN_INFO "md: THIS: "); | |
1625 | print_desc(&sb->this_disk); | |
cd2ac932 | 1626 | } |
1da177e4 | 1627 | |
cd2ac932 CR |
1628 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1629 | { | |
1630 | __u8 *uuid; | |
1631 | ||
1632 | uuid = sb->set_uuid; | |
1633 | printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1634 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1635 | KERN_INFO "md: Name: \"%s\" CT:%llu\n", | |
1636 | le32_to_cpu(sb->major_version), | |
1637 | le32_to_cpu(sb->feature_map), | |
1638 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1639 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1640 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1641 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1642 | sb->set_name, | |
1643 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1644 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1645 | ||
1646 | uuid = sb->device_uuid; | |
1647 | printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
1648 | " RO:%llu\n" | |
1649 | KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" | |
1650 | ":%02x%02x%02x%02x%02x%02x\n" | |
1651 | KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1652 | KERN_INFO "md: (MaxDev:%u) \n", | |
1653 | le32_to_cpu(sb->level), | |
1654 | (unsigned long long)le64_to_cpu(sb->size), | |
1655 | le32_to_cpu(sb->raid_disks), | |
1656 | le32_to_cpu(sb->layout), | |
1657 | le32_to_cpu(sb->chunksize), | |
1658 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1659 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1660 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1661 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1662 | le32_to_cpu(sb->dev_number), | |
1663 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1664 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1665 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1666 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1667 | sb->devflags, | |
1668 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1669 | (unsigned long long)le64_to_cpu(sb->events), | |
1670 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1671 | le32_to_cpu(sb->sb_csum), | |
1672 | le32_to_cpu(sb->max_dev) | |
1673 | ); | |
1da177e4 LT |
1674 | } |
1675 | ||
cd2ac932 | 1676 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1677 | { |
1678 | char b[BDEVNAME_SIZE]; | |
1679 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1680 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1681 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1682 | rdev->desc_nr); | |
1da177e4 | 1683 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1684 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1685 | switch (major_version) { | |
1686 | case 0: | |
1687 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1688 | break; | |
1689 | case 1: | |
1690 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1691 | break; | |
1692 | } | |
1da177e4 LT |
1693 | } else |
1694 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1695 | } | |
1696 | ||
5e56341d | 1697 | static void md_print_devices(void) |
1da177e4 | 1698 | { |
159ec1fc | 1699 | struct list_head *tmp; |
1da177e4 LT |
1700 | mdk_rdev_t *rdev; |
1701 | mddev_t *mddev; | |
1702 | char b[BDEVNAME_SIZE]; | |
1703 | ||
1704 | printk("\n"); | |
1705 | printk("md: **********************************\n"); | |
1706 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1707 | printk("md: **********************************\n"); | |
29ac4aa3 | 1708 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1709 | |
32a7627c N |
1710 | if (mddev->bitmap) |
1711 | bitmap_print_sb(mddev->bitmap); | |
1712 | else | |
1713 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 1714 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
1715 | printk("<%s>", bdevname(rdev->bdev,b)); |
1716 | printk("\n"); | |
1717 | ||
159ec1fc | 1718 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 1719 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
1720 | } |
1721 | printk("md: **********************************\n"); | |
1722 | printk("\n"); | |
1723 | } | |
1724 | ||
1725 | ||
42543769 | 1726 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1727 | { |
42543769 N |
1728 | /* Update each superblock (in-memory image), but |
1729 | * if we are allowed to, skip spares which already | |
1730 | * have the right event counter, or have one earlier | |
1731 | * (which would mean they aren't being marked as dirty | |
1732 | * with the rest of the array) | |
1733 | */ | |
1da177e4 | 1734 | mdk_rdev_t *rdev; |
1da177e4 | 1735 | |
159ec1fc | 1736 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
1737 | if (rdev->sb_events == mddev->events || |
1738 | (nospares && | |
1739 | rdev->raid_disk < 0 && | |
1740 | (rdev->sb_events&1)==0 && | |
1741 | rdev->sb_events+1 == mddev->events)) { | |
1742 | /* Don't update this superblock */ | |
1743 | rdev->sb_loaded = 2; | |
1744 | } else { | |
1745 | super_types[mddev->major_version]. | |
1746 | sync_super(mddev, rdev); | |
1747 | rdev->sb_loaded = 1; | |
1748 | } | |
1da177e4 LT |
1749 | } |
1750 | } | |
1751 | ||
850b2b42 | 1752 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1753 | { |
1da177e4 | 1754 | mdk_rdev_t *rdev; |
06d91a5f | 1755 | int sync_req; |
42543769 | 1756 | int nospares = 0; |
1da177e4 | 1757 | |
8377bc80 N |
1758 | if (mddev->external) |
1759 | return; | |
1da177e4 | 1760 | repeat: |
a9701a30 | 1761 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1762 | |
850b2b42 N |
1763 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1764 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1765 | force_change = 1; | |
1766 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1767 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1768 | * though if events isn't the right even/odd, we will have to do | |
1769 | * spares after all | |
1770 | */ | |
1771 | nospares = 1; | |
1772 | if (force_change) | |
1773 | nospares = 0; | |
1774 | if (mddev->degraded) | |
84692195 N |
1775 | /* If the array is degraded, then skipping spares is both |
1776 | * dangerous and fairly pointless. | |
1777 | * Dangerous because a device that was removed from the array | |
1778 | * might have a event_count that still looks up-to-date, | |
1779 | * so it can be re-added without a resync. | |
1780 | * Pointless because if there are any spares to skip, | |
1781 | * then a recovery will happen and soon that array won't | |
1782 | * be degraded any more and the spare can go back to sleep then. | |
1783 | */ | |
850b2b42 | 1784 | nospares = 0; |
84692195 | 1785 | |
06d91a5f | 1786 | sync_req = mddev->in_sync; |
1da177e4 | 1787 | mddev->utime = get_seconds(); |
42543769 N |
1788 | |
1789 | /* If this is just a dirty<->clean transition, and the array is clean | |
1790 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1791 | if (nospares |
42543769 | 1792 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1793 | && (mddev->events & 1) |
1794 | && mddev->events != 1) | |
42543769 N |
1795 | mddev->events--; |
1796 | else { | |
1797 | /* otherwise we have to go forward and ... */ | |
1798 | mddev->events ++; | |
1799 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1800 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1801 | if ((mddev->events&1)==0) { | |
1802 | mddev->events++; | |
1803 | nospares = 0; | |
1804 | } | |
1805 | } else { | |
1806 | /* otherwise insist on an even 'events' (for clean states) */ | |
1807 | if ((mddev->events&1)) { | |
1808 | mddev->events++; | |
1809 | nospares = 0; | |
1810 | } | |
1811 | } | |
1812 | } | |
1da177e4 LT |
1813 | |
1814 | if (!mddev->events) { | |
1815 | /* | |
1816 | * oops, this 64-bit counter should never wrap. | |
1817 | * Either we are in around ~1 trillion A.C., assuming | |
1818 | * 1 reboot per second, or we have a bug: | |
1819 | */ | |
1820 | MD_BUG(); | |
1821 | mddev->events --; | |
1822 | } | |
1da177e4 LT |
1823 | |
1824 | /* | |
1825 | * do not write anything to disk if using | |
1826 | * nonpersistent superblocks | |
1827 | */ | |
06d91a5f | 1828 | if (!mddev->persistent) { |
e691063a N |
1829 | if (!mddev->external) |
1830 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1831 | ||
a9701a30 | 1832 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1833 | wake_up(&mddev->sb_wait); |
1da177e4 | 1834 | return; |
06d91a5f | 1835 | } |
e691063a | 1836 | sync_sbs(mddev, nospares); |
a9701a30 | 1837 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1838 | |
1839 | dprintk(KERN_INFO | |
1840 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1841 | mdname(mddev),mddev->in_sync); | |
1842 | ||
4ad13663 | 1843 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 1844 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
1845 | char b[BDEVNAME_SIZE]; |
1846 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1847 | if (rdev->sb_loaded != 1) |
1848 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1849 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1850 | dprintk("(skipping faulty "); |
1851 | ||
1852 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1853 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1854 | md_super_write(mddev,rdev, |
0f420358 | 1855 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
1856 | rdev->sb_page); |
1857 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1858 | bdevname(rdev->bdev,b), | |
0f420358 | 1859 | (unsigned long long)rdev->sb_start); |
42543769 | 1860 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1861 | |
1da177e4 LT |
1862 | } else |
1863 | dprintk(")\n"); | |
7bfa19f2 | 1864 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1865 | /* only need to write one superblock... */ |
1866 | break; | |
1867 | } | |
a9701a30 | 1868 | md_super_wait(mddev); |
850b2b42 | 1869 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1870 | |
a9701a30 | 1871 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1872 | if (mddev->in_sync != sync_req || |
1873 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1874 | /* have to write it out again */ |
a9701a30 | 1875 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1876 | goto repeat; |
1877 | } | |
850b2b42 | 1878 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1879 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1880 | wake_up(&mddev->sb_wait); |
06d91a5f | 1881 | |
1da177e4 LT |
1882 | } |
1883 | ||
7f6ce769 | 1884 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
1885 | * We want to accept with case. For this we use cmd_match. |
1886 | */ | |
1887 | static int cmd_match(const char *cmd, const char *str) | |
1888 | { | |
1889 | /* See if cmd, written into a sysfs file, matches | |
1890 | * str. They must either be the same, or cmd can | |
1891 | * have a trailing newline | |
1892 | */ | |
1893 | while (*cmd && *str && *cmd == *str) { | |
1894 | cmd++; | |
1895 | str++; | |
1896 | } | |
1897 | if (*cmd == '\n') | |
1898 | cmd++; | |
1899 | if (*str || *cmd) | |
1900 | return 0; | |
1901 | return 1; | |
1902 | } | |
1903 | ||
86e6ffdd N |
1904 | struct rdev_sysfs_entry { |
1905 | struct attribute attr; | |
1906 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1907 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1908 | }; | |
1909 | ||
1910 | static ssize_t | |
96de1e66 | 1911 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1912 | { |
1913 | char *sep = ""; | |
20a49ff6 | 1914 | size_t len = 0; |
86e6ffdd | 1915 | |
b2d444d7 | 1916 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1917 | len+= sprintf(page+len, "%sfaulty",sep); |
1918 | sep = ","; | |
1919 | } | |
b2d444d7 | 1920 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1921 | len += sprintf(page+len, "%sin_sync",sep); |
1922 | sep = ","; | |
1923 | } | |
f655675b N |
1924 | if (test_bit(WriteMostly, &rdev->flags)) { |
1925 | len += sprintf(page+len, "%swrite_mostly",sep); | |
1926 | sep = ","; | |
1927 | } | |
6bfe0b49 DW |
1928 | if (test_bit(Blocked, &rdev->flags)) { |
1929 | len += sprintf(page+len, "%sblocked", sep); | |
1930 | sep = ","; | |
1931 | } | |
b2d444d7 N |
1932 | if (!test_bit(Faulty, &rdev->flags) && |
1933 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1934 | len += sprintf(page+len, "%sspare", sep); |
1935 | sep = ","; | |
1936 | } | |
1937 | return len+sprintf(page+len, "\n"); | |
1938 | } | |
1939 | ||
45dc2de1 N |
1940 | static ssize_t |
1941 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1942 | { | |
1943 | /* can write | |
1944 | * faulty - simulates and error | |
1945 | * remove - disconnects the device | |
f655675b N |
1946 | * writemostly - sets write_mostly |
1947 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
1948 | * blocked - sets the Blocked flag |
1949 | * -blocked - clears the Blocked flag | |
45dc2de1 N |
1950 | */ |
1951 | int err = -EINVAL; | |
1952 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
1953 | md_error(rdev->mddev, rdev); | |
1954 | err = 0; | |
1955 | } else if (cmd_match(buf, "remove")) { | |
1956 | if (rdev->raid_disk >= 0) | |
1957 | err = -EBUSY; | |
1958 | else { | |
1959 | mddev_t *mddev = rdev->mddev; | |
1960 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
1961 | if (mddev->pers) |
1962 | md_update_sb(mddev, 1); | |
45dc2de1 N |
1963 | md_new_event(mddev); |
1964 | err = 0; | |
1965 | } | |
f655675b N |
1966 | } else if (cmd_match(buf, "writemostly")) { |
1967 | set_bit(WriteMostly, &rdev->flags); | |
1968 | err = 0; | |
1969 | } else if (cmd_match(buf, "-writemostly")) { | |
1970 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
1971 | err = 0; |
1972 | } else if (cmd_match(buf, "blocked")) { | |
1973 | set_bit(Blocked, &rdev->flags); | |
1974 | err = 0; | |
1975 | } else if (cmd_match(buf, "-blocked")) { | |
1976 | clear_bit(Blocked, &rdev->flags); | |
1977 | wake_up(&rdev->blocked_wait); | |
1978 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
1979 | md_wakeup_thread(rdev->mddev->thread); | |
1980 | ||
f655675b | 1981 | err = 0; |
45dc2de1 | 1982 | } |
3c0ee63a N |
1983 | if (!err && rdev->sysfs_state) |
1984 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
1985 | return err ? err : len; |
1986 | } | |
80ca3a44 N |
1987 | static struct rdev_sysfs_entry rdev_state = |
1988 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 1989 | |
4dbcdc75 N |
1990 | static ssize_t |
1991 | errors_show(mdk_rdev_t *rdev, char *page) | |
1992 | { | |
1993 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1994 | } | |
1995 | ||
1996 | static ssize_t | |
1997 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1998 | { | |
1999 | char *e; | |
2000 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2001 | if (*buf && (*e == 0 || *e == '\n')) { | |
2002 | atomic_set(&rdev->corrected_errors, n); | |
2003 | return len; | |
2004 | } | |
2005 | return -EINVAL; | |
2006 | } | |
2007 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2008 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2009 | |
014236d2 N |
2010 | static ssize_t |
2011 | slot_show(mdk_rdev_t *rdev, char *page) | |
2012 | { | |
2013 | if (rdev->raid_disk < 0) | |
2014 | return sprintf(page, "none\n"); | |
2015 | else | |
2016 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2017 | } | |
2018 | ||
2019 | static ssize_t | |
2020 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2021 | { | |
2022 | char *e; | |
c303da6d N |
2023 | int err; |
2024 | char nm[20]; | |
014236d2 N |
2025 | int slot = simple_strtoul(buf, &e, 10); |
2026 | if (strncmp(buf, "none", 4)==0) | |
2027 | slot = -1; | |
2028 | else if (e==buf || (*e && *e!= '\n')) | |
2029 | return -EINVAL; | |
6c2fce2e | 2030 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2031 | /* Setting 'slot' on an active array requires also |
2032 | * updating the 'rd%d' link, and communicating | |
2033 | * with the personality with ->hot_*_disk. | |
2034 | * For now we only support removing | |
2035 | * failed/spare devices. This normally happens automatically, | |
2036 | * but not when the metadata is externally managed. | |
2037 | */ | |
c303da6d N |
2038 | if (rdev->raid_disk == -1) |
2039 | return -EEXIST; | |
2040 | /* personality does all needed checks */ | |
2041 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2042 | return -EINVAL; | |
2043 | err = rdev->mddev->pers-> | |
2044 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2045 | if (err) | |
2046 | return err; | |
2047 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2048 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2049 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2050 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2051 | } else if (rdev->mddev->pers) { |
2052 | mdk_rdev_t *rdev2; | |
6c2fce2e NB |
2053 | /* Activating a spare .. or possibly reactivating |
2054 | * if we every get bitmaps working here. | |
2055 | */ | |
2056 | ||
2057 | if (rdev->raid_disk != -1) | |
2058 | return -EBUSY; | |
2059 | ||
2060 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2061 | return -EINVAL; | |
2062 | ||
159ec1fc | 2063 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2064 | if (rdev2->raid_disk == slot) |
2065 | return -EEXIST; | |
2066 | ||
2067 | rdev->raid_disk = slot; | |
2068 | if (test_bit(In_sync, &rdev->flags)) | |
2069 | rdev->saved_raid_disk = slot; | |
2070 | else | |
2071 | rdev->saved_raid_disk = -1; | |
2072 | err = rdev->mddev->pers-> | |
2073 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2074 | if (err) { |
6c2fce2e | 2075 | rdev->raid_disk = -1; |
6c2fce2e | 2076 | return err; |
52664732 | 2077 | } else |
3c0ee63a | 2078 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2079 | sprintf(nm, "rd%d", rdev->raid_disk); |
2080 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2081 | printk(KERN_WARNING | |
2082 | "md: cannot register " | |
2083 | "%s for %s\n", | |
2084 | nm, mdname(rdev->mddev)); | |
2085 | ||
2086 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2087 | } else { |
2088 | if (slot >= rdev->mddev->raid_disks) | |
2089 | return -ENOSPC; | |
2090 | rdev->raid_disk = slot; | |
2091 | /* assume it is working */ | |
c5d79adb N |
2092 | clear_bit(Faulty, &rdev->flags); |
2093 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2094 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2095 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2096 | } |
014236d2 N |
2097 | return len; |
2098 | } | |
2099 | ||
2100 | ||
2101 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2102 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2103 | |
93c8cad0 N |
2104 | static ssize_t |
2105 | offset_show(mdk_rdev_t *rdev, char *page) | |
2106 | { | |
6961ece4 | 2107 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2108 | } |
2109 | ||
2110 | static ssize_t | |
2111 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2112 | { | |
2113 | char *e; | |
2114 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2115 | if (e==buf || (*e && *e != '\n')) | |
2116 | return -EINVAL; | |
8ed0a521 | 2117 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2118 | return -EBUSY; |
c5d79adb N |
2119 | if (rdev->size && rdev->mddev->external) |
2120 | /* Must set offset before size, so overlap checks | |
2121 | * can be sane */ | |
2122 | return -EBUSY; | |
93c8cad0 N |
2123 | rdev->data_offset = offset; |
2124 | return len; | |
2125 | } | |
2126 | ||
2127 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2128 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2129 | |
83303b61 N |
2130 | static ssize_t |
2131 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2132 | { | |
2133 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
2134 | } | |
2135 | ||
c5d79adb N |
2136 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2137 | { | |
2138 | /* check if two start/length pairs overlap */ | |
2139 | if (s1+l1 <= s2) | |
2140 | return 0; | |
2141 | if (s2+l2 <= s1) | |
2142 | return 0; | |
2143 | return 1; | |
2144 | } | |
2145 | ||
83303b61 N |
2146 | static ssize_t |
2147 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2148 | { | |
d7027458 | 2149 | unsigned long long size; |
c5d79adb | 2150 | unsigned long long oldsize = rdev->size; |
27c529bb N |
2151 | mddev_t *my_mddev = rdev->mddev; |
2152 | ||
d7027458 NB |
2153 | if (strict_strtoull(buf, 10, &size) < 0) |
2154 | return -EINVAL; | |
0cd17fec | 2155 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 NB |
2156 | if (my_mddev->persistent) { |
2157 | size = super_types[my_mddev->major_version]. | |
15f4a5fd | 2158 | rdev_size_change(rdev, size * 2); |
0cd17fec CW |
2159 | if (!size) |
2160 | return -EBUSY; | |
2161 | } else if (!size) { | |
2162 | size = (rdev->bdev->bd_inode->i_size >> 10); | |
2163 | size -= rdev->data_offset/2; | |
2164 | } | |
0cd17fec | 2165 | } |
7d3c6f87 CW |
2166 | if (size < my_mddev->size) |
2167 | return -EINVAL; /* component must fit device */ | |
0cd17fec | 2168 | |
83303b61 | 2169 | rdev->size = size; |
d7027458 | 2170 | if (size > oldsize && my_mddev->external) { |
c5d79adb N |
2171 | /* need to check that all other rdevs with the same ->bdev |
2172 | * do not overlap. We need to unlock the mddev to avoid | |
2173 | * a deadlock. We have already changed rdev->size, and if | |
2174 | * we have to change it back, we will have the lock again. | |
2175 | */ | |
2176 | mddev_t *mddev; | |
2177 | int overlap = 0; | |
159ec1fc | 2178 | struct list_head *tmp; |
c5d79adb | 2179 | |
27c529bb | 2180 | mddev_unlock(my_mddev); |
29ac4aa3 | 2181 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2182 | mdk_rdev_t *rdev2; |
2183 | ||
2184 | mddev_lock(mddev); | |
159ec1fc | 2185 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2186 | if (test_bit(AllReserved, &rdev2->flags) || |
2187 | (rdev->bdev == rdev2->bdev && | |
2188 | rdev != rdev2 && | |
d07bd3bc AN |
2189 | overlaps(rdev->data_offset, rdev->size * 2, |
2190 | rdev2->data_offset, | |
2191 | rdev2->size * 2))) { | |
c5d79adb N |
2192 | overlap = 1; |
2193 | break; | |
2194 | } | |
2195 | mddev_unlock(mddev); | |
2196 | if (overlap) { | |
2197 | mddev_put(mddev); | |
2198 | break; | |
2199 | } | |
2200 | } | |
27c529bb | 2201 | mddev_lock(my_mddev); |
c5d79adb N |
2202 | if (overlap) { |
2203 | /* Someone else could have slipped in a size | |
2204 | * change here, but doing so is just silly. | |
2205 | * We put oldsize back because we *know* it is | |
2206 | * safe, and trust userspace not to race with | |
2207 | * itself | |
2208 | */ | |
2209 | rdev->size = oldsize; | |
2210 | return -EBUSY; | |
2211 | } | |
2212 | } | |
83303b61 N |
2213 | return len; |
2214 | } | |
2215 | ||
2216 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2217 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2218 | |
86e6ffdd N |
2219 | static struct attribute *rdev_default_attrs[] = { |
2220 | &rdev_state.attr, | |
4dbcdc75 | 2221 | &rdev_errors.attr, |
014236d2 | 2222 | &rdev_slot.attr, |
93c8cad0 | 2223 | &rdev_offset.attr, |
83303b61 | 2224 | &rdev_size.attr, |
86e6ffdd N |
2225 | NULL, |
2226 | }; | |
2227 | static ssize_t | |
2228 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2229 | { | |
2230 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2231 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2232 | mddev_t *mddev = rdev->mddev; |
2233 | ssize_t rv; | |
86e6ffdd N |
2234 | |
2235 | if (!entry->show) | |
2236 | return -EIO; | |
27c529bb N |
2237 | |
2238 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2239 | if (!rv) { | |
2240 | if (rdev->mddev == NULL) | |
2241 | rv = -EBUSY; | |
2242 | else | |
2243 | rv = entry->show(rdev, page); | |
2244 | mddev_unlock(mddev); | |
2245 | } | |
2246 | return rv; | |
86e6ffdd N |
2247 | } |
2248 | ||
2249 | static ssize_t | |
2250 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2251 | const char *page, size_t length) | |
2252 | { | |
2253 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2254 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2255 | ssize_t rv; |
2256 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2257 | |
2258 | if (!entry->store) | |
2259 | return -EIO; | |
67463acb N |
2260 | if (!capable(CAP_SYS_ADMIN)) |
2261 | return -EACCES; | |
27c529bb | 2262 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2263 | if (!rv) { |
27c529bb N |
2264 | if (rdev->mddev == NULL) |
2265 | rv = -EBUSY; | |
2266 | else | |
2267 | rv = entry->store(rdev, page, length); | |
6a51830e | 2268 | mddev_unlock(mddev); |
ca388059 N |
2269 | } |
2270 | return rv; | |
86e6ffdd N |
2271 | } |
2272 | ||
2273 | static void rdev_free(struct kobject *ko) | |
2274 | { | |
2275 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2276 | kfree(rdev); | |
2277 | } | |
2278 | static struct sysfs_ops rdev_sysfs_ops = { | |
2279 | .show = rdev_attr_show, | |
2280 | .store = rdev_attr_store, | |
2281 | }; | |
2282 | static struct kobj_type rdev_ktype = { | |
2283 | .release = rdev_free, | |
2284 | .sysfs_ops = &rdev_sysfs_ops, | |
2285 | .default_attrs = rdev_default_attrs, | |
2286 | }; | |
2287 | ||
1da177e4 LT |
2288 | /* |
2289 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2290 | * | |
2291 | * mark the device faulty if: | |
2292 | * | |
2293 | * - the device is nonexistent (zero size) | |
2294 | * - the device has no valid superblock | |
2295 | * | |
2296 | * a faulty rdev _never_ has rdev->sb set. | |
2297 | */ | |
2298 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2299 | { | |
2300 | char b[BDEVNAME_SIZE]; | |
2301 | int err; | |
2302 | mdk_rdev_t *rdev; | |
2303 | sector_t size; | |
2304 | ||
9ffae0cf | 2305 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2306 | if (!rdev) { |
2307 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2308 | return ERR_PTR(-ENOMEM); | |
2309 | } | |
1da177e4 LT |
2310 | |
2311 | if ((err = alloc_disk_sb(rdev))) | |
2312 | goto abort_free; | |
2313 | ||
c5d79adb | 2314 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2315 | if (err) |
2316 | goto abort_free; | |
2317 | ||
f9cb074b | 2318 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2319 | |
1da177e4 | 2320 | rdev->desc_nr = -1; |
2b6e8459 | 2321 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2322 | rdev->raid_disk = -1; |
b2d444d7 | 2323 | rdev->flags = 0; |
1da177e4 | 2324 | rdev->data_offset = 0; |
42543769 | 2325 | rdev->sb_events = 0; |
1da177e4 | 2326 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2327 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2328 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2329 | |
2330 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2331 | if (!size) { | |
2332 | printk(KERN_WARNING | |
2333 | "md: %s has zero or unknown size, marking faulty!\n", | |
2334 | bdevname(rdev->bdev,b)); | |
2335 | err = -EINVAL; | |
2336 | goto abort_free; | |
2337 | } | |
2338 | ||
2339 | if (super_format >= 0) { | |
2340 | err = super_types[super_format]. | |
2341 | load_super(rdev, NULL, super_minor); | |
2342 | if (err == -EINVAL) { | |
df968c4e N |
2343 | printk(KERN_WARNING |
2344 | "md: %s does not have a valid v%d.%d " | |
2345 | "superblock, not importing!\n", | |
2346 | bdevname(rdev->bdev,b), | |
2347 | super_format, super_minor); | |
1da177e4 LT |
2348 | goto abort_free; |
2349 | } | |
2350 | if (err < 0) { | |
2351 | printk(KERN_WARNING | |
2352 | "md: could not read %s's sb, not importing!\n", | |
2353 | bdevname(rdev->bdev,b)); | |
2354 | goto abort_free; | |
2355 | } | |
2356 | } | |
6bfe0b49 | 2357 | |
1da177e4 | 2358 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2359 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2360 | |
2361 | return rdev; | |
2362 | ||
2363 | abort_free: | |
2364 | if (rdev->sb_page) { | |
2365 | if (rdev->bdev) | |
2366 | unlock_rdev(rdev); | |
2367 | free_disk_sb(rdev); | |
2368 | } | |
2369 | kfree(rdev); | |
2370 | return ERR_PTR(err); | |
2371 | } | |
2372 | ||
2373 | /* | |
2374 | * Check a full RAID array for plausibility | |
2375 | */ | |
2376 | ||
2377 | ||
a757e64c | 2378 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2379 | { |
2380 | int i; | |
159ec1fc | 2381 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2382 | char b[BDEVNAME_SIZE]; |
2383 | ||
2384 | freshest = NULL; | |
d089c6af | 2385 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2386 | switch (super_types[mddev->major_version]. |
2387 | load_super(rdev, freshest, mddev->minor_version)) { | |
2388 | case 1: | |
2389 | freshest = rdev; | |
2390 | break; | |
2391 | case 0: | |
2392 | break; | |
2393 | default: | |
2394 | printk( KERN_ERR \ | |
2395 | "md: fatal superblock inconsistency in %s" | |
2396 | " -- removing from array\n", | |
2397 | bdevname(rdev->bdev,b)); | |
2398 | kick_rdev_from_array(rdev); | |
2399 | } | |
2400 | ||
2401 | ||
2402 | super_types[mddev->major_version]. | |
2403 | validate_super(mddev, freshest); | |
2404 | ||
2405 | i = 0; | |
d089c6af | 2406 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2407 | if (rdev != freshest) |
2408 | if (super_types[mddev->major_version]. | |
2409 | validate_super(mddev, rdev)) { | |
2410 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2411 | " from array!\n", | |
2412 | bdevname(rdev->bdev,b)); | |
2413 | kick_rdev_from_array(rdev); | |
2414 | continue; | |
2415 | } | |
2416 | if (mddev->level == LEVEL_MULTIPATH) { | |
2417 | rdev->desc_nr = i++; | |
2418 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2419 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2420 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2421 | rdev->raid_disk = -1; | |
2422 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2423 | } |
2424 | } | |
2425 | ||
2426 | ||
2427 | ||
2428 | if (mddev->recovery_cp != MaxSector && | |
2429 | mddev->level >= 1) | |
2430 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2431 | " -- starting background reconstruction\n", | |
2432 | mdname(mddev)); | |
2433 | ||
1da177e4 LT |
2434 | } |
2435 | ||
19052c0e N |
2436 | static void md_safemode_timeout(unsigned long data); |
2437 | ||
16f17b39 N |
2438 | static ssize_t |
2439 | safe_delay_show(mddev_t *mddev, char *page) | |
2440 | { | |
2441 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2442 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2443 | } | |
2444 | static ssize_t | |
2445 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2446 | { | |
2447 | int scale=1; | |
2448 | int dot=0; | |
2449 | int i; | |
2450 | unsigned long msec; | |
2451 | char buf[30]; | |
97ce0a7f | 2452 | |
16f17b39 N |
2453 | /* remove a period, and count digits after it */ |
2454 | if (len >= sizeof(buf)) | |
2455 | return -EINVAL; | |
97ce0a7f | 2456 | strlcpy(buf, cbuf, sizeof(buf)); |
16f17b39 N |
2457 | for (i=0; i<len; i++) { |
2458 | if (dot) { | |
2459 | if (isdigit(buf[i])) { | |
2460 | buf[i-1] = buf[i]; | |
2461 | scale *= 10; | |
2462 | } | |
2463 | buf[i] = 0; | |
2464 | } else if (buf[i] == '.') { | |
2465 | dot=1; | |
2466 | buf[i] = 0; | |
2467 | } | |
2468 | } | |
97ce0a7f | 2469 | if (strict_strtoul(buf, 10, &msec) < 0) |
16f17b39 N |
2470 | return -EINVAL; |
2471 | msec = (msec * 1000) / scale; | |
2472 | if (msec == 0) | |
2473 | mddev->safemode_delay = 0; | |
2474 | else { | |
19052c0e | 2475 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2476 | mddev->safemode_delay = (msec*HZ)/1000; |
2477 | if (mddev->safemode_delay == 0) | |
2478 | mddev->safemode_delay = 1; | |
19052c0e N |
2479 | if (mddev->safemode_delay < old_delay) |
2480 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2481 | } |
2482 | return len; | |
2483 | } | |
2484 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2485 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2486 | |
eae1701f | 2487 | static ssize_t |
96de1e66 | 2488 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2489 | { |
2604b703 | 2490 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2491 | if (p) |
eae1701f | 2492 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2493 | else if (mddev->clevel[0]) |
2494 | return sprintf(page, "%s\n", mddev->clevel); | |
2495 | else if (mddev->level != LEVEL_NONE) | |
2496 | return sprintf(page, "%d\n", mddev->level); | |
2497 | else | |
2498 | return 0; | |
eae1701f N |
2499 | } |
2500 | ||
d9d166c2 N |
2501 | static ssize_t |
2502 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2503 | { | |
20a49ff6 | 2504 | ssize_t rv = len; |
d9d166c2 N |
2505 | if (mddev->pers) |
2506 | return -EBUSY; | |
2507 | if (len == 0) | |
2508 | return 0; | |
2509 | if (len >= sizeof(mddev->clevel)) | |
2510 | return -ENOSPC; | |
2511 | strncpy(mddev->clevel, buf, len); | |
2512 | if (mddev->clevel[len-1] == '\n') | |
2513 | len--; | |
2514 | mddev->clevel[len] = 0; | |
2515 | mddev->level = LEVEL_NONE; | |
2516 | return rv; | |
2517 | } | |
2518 | ||
2519 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2520 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2521 | |
d4dbd025 N |
2522 | |
2523 | static ssize_t | |
2524 | layout_show(mddev_t *mddev, char *page) | |
2525 | { | |
2526 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2527 | if (mddev->reshape_position != MaxSector && |
2528 | mddev->layout != mddev->new_layout) | |
2529 | return sprintf(page, "%d (%d)\n", | |
2530 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2531 | return sprintf(page, "%d\n", mddev->layout); |
2532 | } | |
2533 | ||
2534 | static ssize_t | |
2535 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2536 | { | |
2537 | char *e; | |
2538 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2539 | |
2540 | if (!*buf || (*e && *e != '\n')) | |
2541 | return -EINVAL; | |
2542 | ||
08a02ecd N |
2543 | if (mddev->pers) |
2544 | return -EBUSY; | |
2545 | if (mddev->reshape_position != MaxSector) | |
2546 | mddev->new_layout = n; | |
2547 | else | |
2548 | mddev->layout = n; | |
d4dbd025 N |
2549 | return len; |
2550 | } | |
2551 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2552 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2553 | |
2554 | ||
eae1701f | 2555 | static ssize_t |
96de1e66 | 2556 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2557 | { |
bb636547 N |
2558 | if (mddev->raid_disks == 0) |
2559 | return 0; | |
08a02ecd N |
2560 | if (mddev->reshape_position != MaxSector && |
2561 | mddev->delta_disks != 0) | |
2562 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2563 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2564 | return sprintf(page, "%d\n", mddev->raid_disks); |
2565 | } | |
2566 | ||
da943b99 N |
2567 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2568 | ||
2569 | static ssize_t | |
2570 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2571 | { | |
da943b99 N |
2572 | char *e; |
2573 | int rv = 0; | |
2574 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2575 | ||
2576 | if (!*buf || (*e && *e != '\n')) | |
2577 | return -EINVAL; | |
2578 | ||
2579 | if (mddev->pers) | |
2580 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2581 | else if (mddev->reshape_position != MaxSector) { |
2582 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2583 | mddev->delta_disks = n - olddisks; | |
2584 | mddev->raid_disks = n; | |
2585 | } else | |
da943b99 N |
2586 | mddev->raid_disks = n; |
2587 | return rv ? rv : len; | |
2588 | } | |
2589 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2590 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2591 | |
3b34380a N |
2592 | static ssize_t |
2593 | chunk_size_show(mddev_t *mddev, char *page) | |
2594 | { | |
08a02ecd N |
2595 | if (mddev->reshape_position != MaxSector && |
2596 | mddev->chunk_size != mddev->new_chunk) | |
2597 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2598 | mddev->chunk_size); | |
3b34380a N |
2599 | return sprintf(page, "%d\n", mddev->chunk_size); |
2600 | } | |
2601 | ||
2602 | static ssize_t | |
2603 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2604 | { | |
2605 | /* can only set chunk_size if array is not yet active */ | |
2606 | char *e; | |
2607 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2608 | ||
3b34380a N |
2609 | if (!*buf || (*e && *e != '\n')) |
2610 | return -EINVAL; | |
2611 | ||
08a02ecd N |
2612 | if (mddev->pers) |
2613 | return -EBUSY; | |
2614 | else if (mddev->reshape_position != MaxSector) | |
2615 | mddev->new_chunk = n; | |
2616 | else | |
2617 | mddev->chunk_size = n; | |
3b34380a N |
2618 | return len; |
2619 | } | |
2620 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2621 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2622 | |
a94213b1 N |
2623 | static ssize_t |
2624 | resync_start_show(mddev_t *mddev, char *page) | |
2625 | { | |
2626 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2627 | } | |
2628 | ||
2629 | static ssize_t | |
2630 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2631 | { | |
a94213b1 N |
2632 | char *e; |
2633 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2634 | ||
2635 | if (mddev->pers) | |
2636 | return -EBUSY; | |
2637 | if (!*buf || (*e && *e != '\n')) | |
2638 | return -EINVAL; | |
2639 | ||
2640 | mddev->recovery_cp = n; | |
2641 | return len; | |
2642 | } | |
2643 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2644 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2645 | |
9e653b63 N |
2646 | /* |
2647 | * The array state can be: | |
2648 | * | |
2649 | * clear | |
2650 | * No devices, no size, no level | |
2651 | * Equivalent to STOP_ARRAY ioctl | |
2652 | * inactive | |
2653 | * May have some settings, but array is not active | |
2654 | * all IO results in error | |
2655 | * When written, doesn't tear down array, but just stops it | |
2656 | * suspended (not supported yet) | |
2657 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2658 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2659 | * readonly |
2660 | * no resync can happen. no superblocks get written. | |
2661 | * write requests fail | |
2662 | * read-auto | |
2663 | * like readonly, but behaves like 'clean' on a write request. | |
2664 | * | |
2665 | * clean - no pending writes, but otherwise active. | |
2666 | * When written to inactive array, starts without resync | |
2667 | * If a write request arrives then | |
2668 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2669 | * if not known, block and switch to write-pending | |
2670 | * If written to an active array that has pending writes, then fails. | |
2671 | * active | |
2672 | * fully active: IO and resync can be happening. | |
2673 | * When written to inactive array, starts with resync | |
2674 | * | |
2675 | * write-pending | |
2676 | * clean, but writes are blocked waiting for 'active' to be written. | |
2677 | * | |
2678 | * active-idle | |
2679 | * like active, but no writes have been seen for a while (100msec). | |
2680 | * | |
2681 | */ | |
2682 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2683 | write_pending, active_idle, bad_word}; | |
05381954 | 2684 | static char *array_states[] = { |
9e653b63 N |
2685 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2686 | "write-pending", "active-idle", NULL }; | |
2687 | ||
2688 | static int match_word(const char *word, char **list) | |
2689 | { | |
2690 | int n; | |
2691 | for (n=0; list[n]; n++) | |
2692 | if (cmd_match(word, list[n])) | |
2693 | break; | |
2694 | return n; | |
2695 | } | |
2696 | ||
2697 | static ssize_t | |
2698 | array_state_show(mddev_t *mddev, char *page) | |
2699 | { | |
2700 | enum array_state st = inactive; | |
2701 | ||
2702 | if (mddev->pers) | |
2703 | switch(mddev->ro) { | |
2704 | case 1: | |
2705 | st = readonly; | |
2706 | break; | |
2707 | case 2: | |
2708 | st = read_auto; | |
2709 | break; | |
2710 | case 0: | |
2711 | if (mddev->in_sync) | |
2712 | st = clean; | |
e691063a N |
2713 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2714 | st = write_pending; | |
9e653b63 N |
2715 | else if (mddev->safemode) |
2716 | st = active_idle; | |
2717 | else | |
2718 | st = active; | |
2719 | } | |
2720 | else { | |
2721 | if (list_empty(&mddev->disks) && | |
2722 | mddev->raid_disks == 0 && | |
2723 | mddev->size == 0) | |
2724 | st = clear; | |
2725 | else | |
2726 | st = inactive; | |
2727 | } | |
2728 | return sprintf(page, "%s\n", array_states[st]); | |
2729 | } | |
2730 | ||
df5b20cf | 2731 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
2732 | static int do_md_run(mddev_t * mddev); |
2733 | static int restart_array(mddev_t *mddev); | |
2734 | ||
2735 | static ssize_t | |
2736 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2737 | { | |
2738 | int err = -EINVAL; | |
2739 | enum array_state st = match_word(buf, array_states); | |
2740 | switch(st) { | |
2741 | case bad_word: | |
2742 | break; | |
2743 | case clear: | |
2744 | /* stopping an active array */ | |
f2ea68cf | 2745 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 2746 | return -EBUSY; |
df5b20cf | 2747 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
2748 | break; |
2749 | case inactive: | |
2750 | /* stopping an active array */ | |
2751 | if (mddev->pers) { | |
f2ea68cf | 2752 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 2753 | return -EBUSY; |
df5b20cf | 2754 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
2755 | } else |
2756 | err = 0; /* already inactive */ | |
9e653b63 N |
2757 | break; |
2758 | case suspended: | |
2759 | break; /* not supported yet */ | |
2760 | case readonly: | |
2761 | if (mddev->pers) | |
df5b20cf | 2762 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
2763 | else { |
2764 | mddev->ro = 1; | |
648b629e | 2765 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
2766 | err = do_md_run(mddev); |
2767 | } | |
2768 | break; | |
2769 | case read_auto: | |
9e653b63 | 2770 | if (mddev->pers) { |
80268ee9 | 2771 | if (mddev->ro == 0) |
df5b20cf | 2772 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 2773 | else if (mddev->ro == 1) |
648b629e N |
2774 | err = restart_array(mddev); |
2775 | if (err == 0) { | |
2776 | mddev->ro = 2; | |
2777 | set_disk_ro(mddev->gendisk, 0); | |
2778 | } | |
9e653b63 N |
2779 | } else { |
2780 | mddev->ro = 2; | |
2781 | err = do_md_run(mddev); | |
2782 | } | |
2783 | break; | |
2784 | case clean: | |
2785 | if (mddev->pers) { | |
2786 | restart_array(mddev); | |
2787 | spin_lock_irq(&mddev->write_lock); | |
2788 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2789 | if (mddev->in_sync == 0) { |
2790 | mddev->in_sync = 1; | |
31a59e34 N |
2791 | if (mddev->safemode == 1) |
2792 | mddev->safemode = 0; | |
e691063a N |
2793 | if (mddev->persistent) |
2794 | set_bit(MD_CHANGE_CLEAN, | |
2795 | &mddev->flags); | |
2796 | } | |
2797 | err = 0; | |
2798 | } else | |
2799 | err = -EBUSY; | |
9e653b63 N |
2800 | spin_unlock_irq(&mddev->write_lock); |
2801 | } else { | |
2802 | mddev->ro = 0; | |
2803 | mddev->recovery_cp = MaxSector; | |
2804 | err = do_md_run(mddev); | |
2805 | } | |
2806 | break; | |
2807 | case active: | |
2808 | if (mddev->pers) { | |
2809 | restart_array(mddev); | |
e691063a N |
2810 | if (mddev->external) |
2811 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2812 | wake_up(&mddev->sb_wait); |
2813 | err = 0; | |
2814 | } else { | |
2815 | mddev->ro = 0; | |
648b629e | 2816 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
2817 | err = do_md_run(mddev); |
2818 | } | |
2819 | break; | |
2820 | case write_pending: | |
2821 | case active_idle: | |
2822 | /* these cannot be set */ | |
2823 | break; | |
2824 | } | |
2825 | if (err) | |
2826 | return err; | |
0fd62b86 | 2827 | else { |
b62b7590 | 2828 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 2829 | return len; |
0fd62b86 | 2830 | } |
9e653b63 | 2831 | } |
80ca3a44 N |
2832 | static struct md_sysfs_entry md_array_state = |
2833 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2834 | |
6d7ff738 N |
2835 | static ssize_t |
2836 | null_show(mddev_t *mddev, char *page) | |
2837 | { | |
2838 | return -EINVAL; | |
2839 | } | |
2840 | ||
2841 | static ssize_t | |
2842 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2843 | { | |
2844 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2845 | /* The new device is added to the array. | |
2846 | * If the array has a persistent superblock, we read the | |
2847 | * superblock to initialise info and check validity. | |
2848 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2849 | * which mainly checks size. | |
2850 | */ | |
2851 | char *e; | |
2852 | int major = simple_strtoul(buf, &e, 10); | |
2853 | int minor; | |
2854 | dev_t dev; | |
2855 | mdk_rdev_t *rdev; | |
2856 | int err; | |
2857 | ||
2858 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2859 | return -EINVAL; | |
2860 | minor = simple_strtoul(e+1, &e, 10); | |
2861 | if (*e && *e != '\n') | |
2862 | return -EINVAL; | |
2863 | dev = MKDEV(major, minor); | |
2864 | if (major != MAJOR(dev) || | |
2865 | minor != MINOR(dev)) | |
2866 | return -EOVERFLOW; | |
2867 | ||
2868 | ||
2869 | if (mddev->persistent) { | |
2870 | rdev = md_import_device(dev, mddev->major_version, | |
2871 | mddev->minor_version); | |
2872 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2873 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2874 | mdk_rdev_t, same_set); | |
2875 | err = super_types[mddev->major_version] | |
2876 | .load_super(rdev, rdev0, mddev->minor_version); | |
2877 | if (err < 0) | |
2878 | goto out; | |
2879 | } | |
c5d79adb N |
2880 | } else if (mddev->external) |
2881 | rdev = md_import_device(dev, -2, -1); | |
2882 | else | |
6d7ff738 N |
2883 | rdev = md_import_device(dev, -1, -1); |
2884 | ||
2885 | if (IS_ERR(rdev)) | |
2886 | return PTR_ERR(rdev); | |
2887 | err = bind_rdev_to_array(rdev, mddev); | |
2888 | out: | |
2889 | if (err) | |
2890 | export_rdev(rdev); | |
2891 | return err ? err : len; | |
2892 | } | |
2893 | ||
2894 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2895 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2896 | |
9b1d1dac PC |
2897 | static ssize_t |
2898 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2899 | { | |
2900 | char *end; | |
2901 | unsigned long chunk, end_chunk; | |
2902 | ||
2903 | if (!mddev->bitmap) | |
2904 | goto out; | |
2905 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2906 | while (*buf) { | |
2907 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2908 | if (buf == end) break; | |
2909 | if (*end == '-') { /* range */ | |
2910 | buf = end + 1; | |
2911 | end_chunk = simple_strtoul(buf, &end, 0); | |
2912 | if (buf == end) break; | |
2913 | } | |
2914 | if (*end && !isspace(*end)) break; | |
2915 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
2916 | buf = end; | |
2917 | while (isspace(*buf)) buf++; | |
2918 | } | |
2919 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
2920 | out: | |
2921 | return len; | |
2922 | } | |
2923 | ||
2924 | static struct md_sysfs_entry md_bitmap = | |
2925 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
2926 | ||
a35b0d69 N |
2927 | static ssize_t |
2928 | size_show(mddev_t *mddev, char *page) | |
2929 | { | |
2930 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2931 | } | |
2932 | ||
d71f9f88 | 2933 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
2934 | |
2935 | static ssize_t | |
2936 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2937 | { | |
2938 | /* If array is inactive, we can reduce the component size, but | |
2939 | * not increase it (except from 0). | |
2940 | * If array is active, we can try an on-line resize | |
2941 | */ | |
2942 | char *e; | |
2943 | int err = 0; | |
2944 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2945 | if (!*buf || *buf == '\n' || | |
2946 | (*e && *e != '\n')) | |
2947 | return -EINVAL; | |
2948 | ||
2949 | if (mddev->pers) { | |
d71f9f88 | 2950 | err = update_size(mddev, size * 2); |
850b2b42 | 2951 | md_update_sb(mddev, 1); |
a35b0d69 N |
2952 | } else { |
2953 | if (mddev->size == 0 || | |
2954 | mddev->size > size) | |
2955 | mddev->size = size; | |
2956 | else | |
2957 | err = -ENOSPC; | |
2958 | } | |
2959 | return err ? err : len; | |
2960 | } | |
2961 | ||
2962 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 2963 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 2964 | |
8bb93aac N |
2965 | |
2966 | /* Metdata version. | |
e691063a N |
2967 | * This is one of |
2968 | * 'none' for arrays with no metadata (good luck...) | |
2969 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
2970 | * or N.M for internally known formats |
2971 | */ | |
2972 | static ssize_t | |
2973 | metadata_show(mddev_t *mddev, char *page) | |
2974 | { | |
2975 | if (mddev->persistent) | |
2976 | return sprintf(page, "%d.%d\n", | |
2977 | mddev->major_version, mddev->minor_version); | |
e691063a N |
2978 | else if (mddev->external) |
2979 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
2980 | else |
2981 | return sprintf(page, "none\n"); | |
2982 | } | |
2983 | ||
2984 | static ssize_t | |
2985 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2986 | { | |
2987 | int major, minor; | |
2988 | char *e; | |
ea43ddd8 N |
2989 | /* Changing the details of 'external' metadata is |
2990 | * always permitted. Otherwise there must be | |
2991 | * no devices attached to the array. | |
2992 | */ | |
2993 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
2994 | ; | |
2995 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
2996 | return -EBUSY; |
2997 | ||
2998 | if (cmd_match(buf, "none")) { | |
2999 | mddev->persistent = 0; | |
e691063a N |
3000 | mddev->external = 0; |
3001 | mddev->major_version = 0; | |
3002 | mddev->minor_version = 90; | |
3003 | return len; | |
3004 | } | |
3005 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3006 | size_t namelen = len-9; |
e691063a N |
3007 | if (namelen >= sizeof(mddev->metadata_type)) |
3008 | namelen = sizeof(mddev->metadata_type)-1; | |
3009 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3010 | mddev->metadata_type[namelen] = 0; | |
3011 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3012 | mddev->metadata_type[--namelen] = 0; | |
3013 | mddev->persistent = 0; | |
3014 | mddev->external = 1; | |
8bb93aac N |
3015 | mddev->major_version = 0; |
3016 | mddev->minor_version = 90; | |
3017 | return len; | |
3018 | } | |
3019 | major = simple_strtoul(buf, &e, 10); | |
3020 | if (e==buf || *e != '.') | |
3021 | return -EINVAL; | |
3022 | buf = e+1; | |
3023 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3024 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3025 | return -EINVAL; |
50511da3 | 3026 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3027 | return -ENOENT; |
3028 | mddev->major_version = major; | |
3029 | mddev->minor_version = minor; | |
3030 | mddev->persistent = 1; | |
e691063a | 3031 | mddev->external = 0; |
8bb93aac N |
3032 | return len; |
3033 | } | |
3034 | ||
3035 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3036 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3037 | |
24dd469d | 3038 | static ssize_t |
7eec314d | 3039 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3040 | { |
7eec314d | 3041 | char *type = "idle"; |
31399d9e | 3042 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 3043 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3044 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3045 | type = "reshape"; | |
3046 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3047 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3048 | type = "resync"; | |
3049 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3050 | type = "check"; | |
3051 | else | |
3052 | type = "repair"; | |
72a23c21 | 3053 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3054 | type = "recover"; |
3055 | } | |
3056 | return sprintf(page, "%s\n", type); | |
3057 | } | |
3058 | ||
3059 | static ssize_t | |
7eec314d | 3060 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3061 | { |
7eec314d N |
3062 | if (!mddev->pers || !mddev->pers->sync_request) |
3063 | return -EINVAL; | |
3064 | ||
bce74dac | 3065 | if (cmd_match(page, "idle")) { |
7eec314d N |
3066 | if (mddev->sync_thread) { |
3067 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3068 | md_unregister_thread(mddev->sync_thread); | |
3069 | mddev->sync_thread = NULL; | |
3070 | mddev->recovery = 0; | |
3071 | } | |
03c902e1 N |
3072 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3073 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3074 | return -EBUSY; |
72a23c21 NB |
3075 | else if (cmd_match(page, "resync")) |
3076 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3077 | else if (cmd_match(page, "recover")) { | |
3078 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3079 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3080 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3081 | int err; |
3082 | if (mddev->pers->start_reshape == NULL) | |
3083 | return -EINVAL; | |
3084 | err = mddev->pers->start_reshape(mddev); | |
3085 | if (err) | |
3086 | return err; | |
a99ac971 | 3087 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3088 | } else { |
bce74dac | 3089 | if (cmd_match(page, "check")) |
7eec314d | 3090 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3091 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3092 | return -EINVAL; |
3093 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3094 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3095 | } |
03c902e1 | 3096 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3097 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3098 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3099 | return len; |
3100 | } | |
3101 | ||
9d88883e | 3102 | static ssize_t |
96de1e66 | 3103 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3104 | { |
3105 | return sprintf(page, "%llu\n", | |
3106 | (unsigned long long) mddev->resync_mismatches); | |
3107 | } | |
3108 | ||
80ca3a44 N |
3109 | static struct md_sysfs_entry md_scan_mode = |
3110 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3111 | |
96de1e66 | 3112 | |
80ca3a44 | 3113 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3114 | |
88202a0c N |
3115 | static ssize_t |
3116 | sync_min_show(mddev_t *mddev, char *page) | |
3117 | { | |
3118 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3119 | mddev->sync_speed_min ? "local": "system"); | |
3120 | } | |
3121 | ||
3122 | static ssize_t | |
3123 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3124 | { | |
3125 | int min; | |
3126 | char *e; | |
3127 | if (strncmp(buf, "system", 6)==0) { | |
3128 | mddev->sync_speed_min = 0; | |
3129 | return len; | |
3130 | } | |
3131 | min = simple_strtoul(buf, &e, 10); | |
3132 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3133 | return -EINVAL; | |
3134 | mddev->sync_speed_min = min; | |
3135 | return len; | |
3136 | } | |
3137 | ||
3138 | static struct md_sysfs_entry md_sync_min = | |
3139 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3140 | ||
3141 | static ssize_t | |
3142 | sync_max_show(mddev_t *mddev, char *page) | |
3143 | { | |
3144 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3145 | mddev->sync_speed_max ? "local": "system"); | |
3146 | } | |
3147 | ||
3148 | static ssize_t | |
3149 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3150 | { | |
3151 | int max; | |
3152 | char *e; | |
3153 | if (strncmp(buf, "system", 6)==0) { | |
3154 | mddev->sync_speed_max = 0; | |
3155 | return len; | |
3156 | } | |
3157 | max = simple_strtoul(buf, &e, 10); | |
3158 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3159 | return -EINVAL; | |
3160 | mddev->sync_speed_max = max; | |
3161 | return len; | |
3162 | } | |
3163 | ||
3164 | static struct md_sysfs_entry md_sync_max = | |
3165 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3166 | ||
d7f3d291 IP |
3167 | static ssize_t |
3168 | degraded_show(mddev_t *mddev, char *page) | |
3169 | { | |
3170 | return sprintf(page, "%d\n", mddev->degraded); | |
3171 | } | |
3172 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3173 | |
90b08710 BS |
3174 | static ssize_t |
3175 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3176 | { | |
3177 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3178 | } | |
3179 | ||
3180 | static ssize_t | |
3181 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3182 | { | |
3183 | long n; | |
3184 | ||
3185 | if (strict_strtol(buf, 10, &n)) | |
3186 | return -EINVAL; | |
3187 | ||
3188 | if (n != 0 && n != 1) | |
3189 | return -EINVAL; | |
3190 | ||
3191 | mddev->parallel_resync = n; | |
3192 | ||
3193 | if (mddev->sync_thread) | |
3194 | wake_up(&resync_wait); | |
3195 | ||
3196 | return len; | |
3197 | } | |
3198 | ||
3199 | /* force parallel resync, even with shared block devices */ | |
3200 | static struct md_sysfs_entry md_sync_force_parallel = | |
3201 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3202 | sync_force_parallel_show, sync_force_parallel_store); | |
3203 | ||
88202a0c N |
3204 | static ssize_t |
3205 | sync_speed_show(mddev_t *mddev, char *page) | |
3206 | { | |
3207 | unsigned long resync, dt, db; | |
9687a60c AN |
3208 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3209 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3210 | if (!dt) dt++; |
9687a60c AN |
3211 | db = resync - mddev->resync_mark_cnt; |
3212 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3213 | } |
3214 | ||
80ca3a44 | 3215 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3216 | |
3217 | static ssize_t | |
3218 | sync_completed_show(mddev_t *mddev, char *page) | |
3219 | { | |
3220 | unsigned long max_blocks, resync; | |
3221 | ||
3222 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3223 | max_blocks = mddev->resync_max_sectors; | |
3224 | else | |
3225 | max_blocks = mddev->size << 1; | |
3226 | ||
3227 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
3228 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
3229 | } | |
3230 | ||
80ca3a44 | 3231 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3232 | |
5e96ee65 NB |
3233 | static ssize_t |
3234 | min_sync_show(mddev_t *mddev, char *page) | |
3235 | { | |
3236 | return sprintf(page, "%llu\n", | |
3237 | (unsigned long long)mddev->resync_min); | |
3238 | } | |
3239 | static ssize_t | |
3240 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3241 | { | |
3242 | unsigned long long min; | |
3243 | if (strict_strtoull(buf, 10, &min)) | |
3244 | return -EINVAL; | |
3245 | if (min > mddev->resync_max) | |
3246 | return -EINVAL; | |
3247 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3248 | return -EBUSY; | |
3249 | ||
3250 | /* Must be a multiple of chunk_size */ | |
3251 | if (mddev->chunk_size) { | |
3252 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3253 | return -EINVAL; | |
3254 | } | |
3255 | mddev->resync_min = min; | |
3256 | ||
3257 | return len; | |
3258 | } | |
3259 | ||
3260 | static struct md_sysfs_entry md_min_sync = | |
3261 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3262 | ||
c6207277 N |
3263 | static ssize_t |
3264 | max_sync_show(mddev_t *mddev, char *page) | |
3265 | { | |
3266 | if (mddev->resync_max == MaxSector) | |
3267 | return sprintf(page, "max\n"); | |
3268 | else | |
3269 | return sprintf(page, "%llu\n", | |
3270 | (unsigned long long)mddev->resync_max); | |
3271 | } | |
3272 | static ssize_t | |
3273 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3274 | { | |
3275 | if (strncmp(buf, "max", 3) == 0) | |
3276 | mddev->resync_max = MaxSector; | |
3277 | else { | |
5e96ee65 NB |
3278 | unsigned long long max; |
3279 | if (strict_strtoull(buf, 10, &max)) | |
3280 | return -EINVAL; | |
3281 | if (max < mddev->resync_min) | |
c6207277 N |
3282 | return -EINVAL; |
3283 | if (max < mddev->resync_max && | |
3284 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3285 | return -EBUSY; | |
3286 | ||
3287 | /* Must be a multiple of chunk_size */ | |
3288 | if (mddev->chunk_size) { | |
3289 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3290 | return -EINVAL; | |
3291 | } | |
3292 | mddev->resync_max = max; | |
3293 | } | |
3294 | wake_up(&mddev->recovery_wait); | |
3295 | return len; | |
3296 | } | |
3297 | ||
3298 | static struct md_sysfs_entry md_max_sync = | |
3299 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3300 | ||
e464eafd N |
3301 | static ssize_t |
3302 | suspend_lo_show(mddev_t *mddev, char *page) | |
3303 | { | |
3304 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3305 | } | |
3306 | ||
3307 | static ssize_t | |
3308 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3309 | { | |
3310 | char *e; | |
3311 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3312 | ||
3313 | if (mddev->pers->quiesce == NULL) | |
3314 | return -EINVAL; | |
3315 | if (buf == e || (*e && *e != '\n')) | |
3316 | return -EINVAL; | |
3317 | if (new >= mddev->suspend_hi || | |
3318 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3319 | mddev->suspend_lo = new; | |
3320 | mddev->pers->quiesce(mddev, 2); | |
3321 | return len; | |
3322 | } else | |
3323 | return -EINVAL; | |
3324 | } | |
3325 | static struct md_sysfs_entry md_suspend_lo = | |
3326 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3327 | ||
3328 | ||
3329 | static ssize_t | |
3330 | suspend_hi_show(mddev_t *mddev, char *page) | |
3331 | { | |
3332 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3333 | } | |
3334 | ||
3335 | static ssize_t | |
3336 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3337 | { | |
3338 | char *e; | |
3339 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3340 | ||
3341 | if (mddev->pers->quiesce == NULL) | |
3342 | return -EINVAL; | |
3343 | if (buf == e || (*e && *e != '\n')) | |
3344 | return -EINVAL; | |
3345 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3346 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3347 | mddev->suspend_hi = new; | |
3348 | mddev->pers->quiesce(mddev, 1); | |
3349 | mddev->pers->quiesce(mddev, 0); | |
3350 | return len; | |
3351 | } else | |
3352 | return -EINVAL; | |
3353 | } | |
3354 | static struct md_sysfs_entry md_suspend_hi = | |
3355 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3356 | ||
08a02ecd N |
3357 | static ssize_t |
3358 | reshape_position_show(mddev_t *mddev, char *page) | |
3359 | { | |
3360 | if (mddev->reshape_position != MaxSector) | |
3361 | return sprintf(page, "%llu\n", | |
3362 | (unsigned long long)mddev->reshape_position); | |
3363 | strcpy(page, "none\n"); | |
3364 | return 5; | |
3365 | } | |
3366 | ||
3367 | static ssize_t | |
3368 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3369 | { | |
3370 | char *e; | |
3371 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3372 | if (mddev->pers) | |
3373 | return -EBUSY; | |
3374 | if (buf == e || (*e && *e != '\n')) | |
3375 | return -EINVAL; | |
3376 | mddev->reshape_position = new; | |
3377 | mddev->delta_disks = 0; | |
3378 | mddev->new_level = mddev->level; | |
3379 | mddev->new_layout = mddev->layout; | |
3380 | mddev->new_chunk = mddev->chunk_size; | |
3381 | return len; | |
3382 | } | |
3383 | ||
3384 | static struct md_sysfs_entry md_reshape_position = | |
3385 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3386 | reshape_position_store); | |
3387 | ||
e464eafd | 3388 | |
eae1701f N |
3389 | static struct attribute *md_default_attrs[] = { |
3390 | &md_level.attr, | |
d4dbd025 | 3391 | &md_layout.attr, |
eae1701f | 3392 | &md_raid_disks.attr, |
3b34380a | 3393 | &md_chunk_size.attr, |
a35b0d69 | 3394 | &md_size.attr, |
a94213b1 | 3395 | &md_resync_start.attr, |
8bb93aac | 3396 | &md_metadata.attr, |
6d7ff738 | 3397 | &md_new_device.attr, |
16f17b39 | 3398 | &md_safe_delay.attr, |
9e653b63 | 3399 | &md_array_state.attr, |
08a02ecd | 3400 | &md_reshape_position.attr, |
411036fa N |
3401 | NULL, |
3402 | }; | |
3403 | ||
3404 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3405 | &md_scan_mode.attr, |
9d88883e | 3406 | &md_mismatches.attr, |
88202a0c N |
3407 | &md_sync_min.attr, |
3408 | &md_sync_max.attr, | |
3409 | &md_sync_speed.attr, | |
90b08710 | 3410 | &md_sync_force_parallel.attr, |
88202a0c | 3411 | &md_sync_completed.attr, |
5e96ee65 | 3412 | &md_min_sync.attr, |
c6207277 | 3413 | &md_max_sync.attr, |
e464eafd N |
3414 | &md_suspend_lo.attr, |
3415 | &md_suspend_hi.attr, | |
9b1d1dac | 3416 | &md_bitmap.attr, |
d7f3d291 | 3417 | &md_degraded.attr, |
eae1701f N |
3418 | NULL, |
3419 | }; | |
411036fa N |
3420 | static struct attribute_group md_redundancy_group = { |
3421 | .name = NULL, | |
3422 | .attrs = md_redundancy_attrs, | |
3423 | }; | |
3424 | ||
eae1701f N |
3425 | |
3426 | static ssize_t | |
3427 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3428 | { | |
3429 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3430 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3431 | ssize_t rv; |
eae1701f N |
3432 | |
3433 | if (!entry->show) | |
3434 | return -EIO; | |
5dc5cf7d IM |
3435 | rv = mddev_lock(mddev); |
3436 | if (!rv) { | |
3437 | rv = entry->show(mddev, page); | |
3438 | mddev_unlock(mddev); | |
3439 | } | |
96de1e66 | 3440 | return rv; |
eae1701f N |
3441 | } |
3442 | ||
3443 | static ssize_t | |
3444 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3445 | const char *page, size_t length) | |
3446 | { | |
3447 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3448 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3449 | ssize_t rv; |
eae1701f N |
3450 | |
3451 | if (!entry->store) | |
3452 | return -EIO; | |
67463acb N |
3453 | if (!capable(CAP_SYS_ADMIN)) |
3454 | return -EACCES; | |
5dc5cf7d | 3455 | rv = mddev_lock(mddev); |
d3374825 N |
3456 | if (mddev->hold_active == UNTIL_IOCTL) |
3457 | mddev->hold_active = 0; | |
5dc5cf7d IM |
3458 | if (!rv) { |
3459 | rv = entry->store(mddev, page, length); | |
3460 | mddev_unlock(mddev); | |
3461 | } | |
96de1e66 | 3462 | return rv; |
eae1701f N |
3463 | } |
3464 | ||
3465 | static void md_free(struct kobject *ko) | |
3466 | { | |
3467 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
3468 | |
3469 | if (mddev->sysfs_state) | |
3470 | sysfs_put(mddev->sysfs_state); | |
3471 | ||
3472 | if (mddev->gendisk) { | |
3473 | del_gendisk(mddev->gendisk); | |
3474 | put_disk(mddev->gendisk); | |
3475 | } | |
3476 | if (mddev->queue) | |
3477 | blk_cleanup_queue(mddev->queue); | |
3478 | ||
eae1701f N |
3479 | kfree(mddev); |
3480 | } | |
3481 | ||
3482 | static struct sysfs_ops md_sysfs_ops = { | |
3483 | .show = md_attr_show, | |
3484 | .store = md_attr_store, | |
3485 | }; | |
3486 | static struct kobj_type md_ktype = { | |
3487 | .release = md_free, | |
3488 | .sysfs_ops = &md_sysfs_ops, | |
3489 | .default_attrs = md_default_attrs, | |
3490 | }; | |
3491 | ||
1da177e4 LT |
3492 | int mdp_major = 0; |
3493 | ||
3494 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3495 | { | |
48c9c27b | 3496 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3497 | mddev_t *mddev = mddev_find(dev); |
3498 | struct gendisk *disk; | |
3499 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
3500 | int shift = partitioned ? MdpMinorShift : 0; | |
3501 | int unit = MINOR(dev) >> shift; | |
3830c62f | 3502 | int error; |
1da177e4 LT |
3503 | |
3504 | if (!mddev) | |
3505 | return NULL; | |
3506 | ||
d3374825 N |
3507 | /* wait for any previous instance if this device |
3508 | * to be completed removed (mddev_delayed_delete). | |
3509 | */ | |
3510 | flush_scheduled_work(); | |
3511 | ||
48c9c27b | 3512 | mutex_lock(&disks_mutex); |
1da177e4 | 3513 | if (mddev->gendisk) { |
48c9c27b | 3514 | mutex_unlock(&disks_mutex); |
1da177e4 LT |
3515 | mddev_put(mddev); |
3516 | return NULL; | |
3517 | } | |
8b765398 N |
3518 | |
3519 | mddev->queue = blk_alloc_queue(GFP_KERNEL); | |
3520 | if (!mddev->queue) { | |
3521 | mutex_unlock(&disks_mutex); | |
3522 | mddev_put(mddev); | |
3523 | return NULL; | |
3524 | } | |
3525 | /* Can be unlocked because the queue is new: no concurrency */ | |
3526 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
3527 | ||
3528 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3529 | ||
1da177e4 LT |
3530 | disk = alloc_disk(1 << shift); |
3531 | if (!disk) { | |
48c9c27b | 3532 | mutex_unlock(&disks_mutex); |
8b765398 N |
3533 | blk_cleanup_queue(mddev->queue); |
3534 | mddev->queue = NULL; | |
1da177e4 LT |
3535 | mddev_put(mddev); |
3536 | return NULL; | |
3537 | } | |
3538 | disk->major = MAJOR(dev); | |
3539 | disk->first_minor = unit << shift; | |
ce7b0f46 | 3540 | if (partitioned) |
1da177e4 | 3541 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3542 | else |
1da177e4 | 3543 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3544 | disk->fops = &md_fops; |
3545 | disk->private_data = mddev; | |
3546 | disk->queue = mddev->queue; | |
92850bbd | 3547 | /* Allow extended partitions. This makes the |
d3374825 | 3548 | * 'mdp' device redundant, but we can't really |
92850bbd N |
3549 | * remove it now. |
3550 | */ | |
3551 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
3552 | add_disk(disk); |
3553 | mddev->gendisk = disk; | |
ed9e1982 TH |
3554 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
3555 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
f48ed538 | 3556 | mutex_unlock(&disks_mutex); |
3830c62f | 3557 | if (error) |
5e55e2f5 N |
3558 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3559 | disk->disk_name); | |
b62b7590 | 3560 | else { |
3830c62f | 3561 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
3562 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
3563 | } | |
d3374825 | 3564 | mddev_put(mddev); |
1da177e4 LT |
3565 | return NULL; |
3566 | } | |
3567 | ||
1da177e4 LT |
3568 | static void md_safemode_timeout(unsigned long data) |
3569 | { | |
3570 | mddev_t *mddev = (mddev_t *) data; | |
3571 | ||
0fd62b86 NB |
3572 | if (!atomic_read(&mddev->writes_pending)) { |
3573 | mddev->safemode = 1; | |
3574 | if (mddev->external) | |
b62b7590 | 3575 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 3576 | } |
1da177e4 LT |
3577 | md_wakeup_thread(mddev->thread); |
3578 | } | |
3579 | ||
6ff8d8ec | 3580 | static int start_dirty_degraded; |
1da177e4 LT |
3581 | |
3582 | static int do_md_run(mddev_t * mddev) | |
3583 | { | |
2604b703 | 3584 | int err; |
1da177e4 | 3585 | int chunk_size; |
1da177e4 LT |
3586 | mdk_rdev_t *rdev; |
3587 | struct gendisk *disk; | |
2604b703 | 3588 | struct mdk_personality *pers; |
1da177e4 LT |
3589 | char b[BDEVNAME_SIZE]; |
3590 | ||
a757e64c N |
3591 | if (list_empty(&mddev->disks)) |
3592 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3593 | return -EINVAL; |
1da177e4 LT |
3594 | |
3595 | if (mddev->pers) | |
3596 | return -EBUSY; | |
3597 | ||
3598 | /* | |
3599 | * Analyze all RAID superblock(s) | |
3600 | */ | |
1ec4a939 N |
3601 | if (!mddev->raid_disks) { |
3602 | if (!mddev->persistent) | |
3603 | return -EINVAL; | |
a757e64c | 3604 | analyze_sbs(mddev); |
1ec4a939 | 3605 | } |
1da177e4 LT |
3606 | |
3607 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3608 | |
3609 | if (chunk_size) { | |
1da177e4 LT |
3610 | if (chunk_size > MAX_CHUNK_SIZE) { |
3611 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3612 | chunk_size, MAX_CHUNK_SIZE); | |
3613 | return -EINVAL; | |
3614 | } | |
3615 | /* | |
4bbf3771 | 3616 | * chunk-size has to be a power of 2 |
1da177e4 LT |
3617 | */ |
3618 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3619 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3620 | return -EINVAL; |
3621 | } | |
1da177e4 LT |
3622 | |
3623 | /* devices must have minimum size of one chunk */ | |
159ec1fc | 3624 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3625 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3626 | continue; |
3627 | if (rdev->size < chunk_size / 1024) { | |
3628 | printk(KERN_WARNING | |
3629 | "md: Dev %s smaller than chunk_size:" | |
3630 | " %lluk < %dk\n", | |
3631 | bdevname(rdev->bdev,b), | |
3632 | (unsigned long long)rdev->size, | |
3633 | chunk_size / 1024); | |
3634 | return -EINVAL; | |
3635 | } | |
3636 | } | |
3637 | } | |
3638 | ||
d9d166c2 N |
3639 | if (mddev->level != LEVEL_NONE) |
3640 | request_module("md-level-%d", mddev->level); | |
3641 | else if (mddev->clevel[0]) | |
3642 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3643 | |
3644 | /* | |
3645 | * Drop all container device buffers, from now on | |
3646 | * the only valid external interface is through the md | |
3647 | * device. | |
1da177e4 | 3648 | */ |
159ec1fc | 3649 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3650 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3651 | continue; |
3652 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3653 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3654 | |
3655 | /* perform some consistency tests on the device. | |
3656 | * We don't want the data to overlap the metadata, | |
3657 | * Internal Bitmap issues has handled elsewhere. | |
3658 | */ | |
0f420358 | 3659 | if (rdev->data_offset < rdev->sb_start) { |
f0d76d70 N |
3660 | if (mddev->size && |
3661 | rdev->data_offset + mddev->size*2 | |
0f420358 | 3662 | > rdev->sb_start) { |
f0d76d70 N |
3663 | printk("md: %s: data overlaps metadata\n", |
3664 | mdname(mddev)); | |
3665 | return -EINVAL; | |
3666 | } | |
3667 | } else { | |
0f420358 | 3668 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
3669 | > rdev->data_offset) { |
3670 | printk("md: %s: metadata overlaps data\n", | |
3671 | mdname(mddev)); | |
3672 | return -EINVAL; | |
3673 | } | |
3674 | } | |
3c0ee63a | 3675 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
3676 | } |
3677 | ||
3678 | md_probe(mddev->unit, NULL, NULL); | |
3679 | disk = mddev->gendisk; | |
3680 | if (!disk) | |
3681 | return -ENOMEM; | |
3682 | ||
3683 | spin_lock(&pers_lock); | |
d9d166c2 | 3684 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3685 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3686 | spin_unlock(&pers_lock); |
d9d166c2 N |
3687 | if (mddev->level != LEVEL_NONE) |
3688 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3689 | mddev->level); | |
3690 | else | |
3691 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3692 | mddev->clevel); | |
1da177e4 LT |
3693 | return -EINVAL; |
3694 | } | |
2604b703 | 3695 | mddev->pers = pers; |
1da177e4 | 3696 | spin_unlock(&pers_lock); |
d9d166c2 N |
3697 | mddev->level = pers->level; |
3698 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 3699 | |
f6705578 | 3700 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3701 | pers->start_reshape == NULL) { |
f6705578 N |
3702 | /* This personality cannot handle reshaping... */ |
3703 | mddev->pers = NULL; | |
3704 | module_put(pers->owner); | |
3705 | return -EINVAL; | |
3706 | } | |
3707 | ||
7dd5e7c3 N |
3708 | if (pers->sync_request) { |
3709 | /* Warn if this is a potentially silly | |
3710 | * configuration. | |
3711 | */ | |
3712 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3713 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 3714 | int warned = 0; |
159ec1fc CR |
3715 | |
3716 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
3717 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
3718 | if (rdev < rdev2 && |
3719 | rdev->bdev->bd_contains == | |
3720 | rdev2->bdev->bd_contains) { | |
3721 | printk(KERN_WARNING | |
3722 | "%s: WARNING: %s appears to be" | |
3723 | " on the same physical disk as" | |
3724 | " %s.\n", | |
3725 | mdname(mddev), | |
3726 | bdevname(rdev->bdev,b), | |
3727 | bdevname(rdev2->bdev,b2)); | |
3728 | warned = 1; | |
3729 | } | |
3730 | } | |
159ec1fc | 3731 | |
7dd5e7c3 N |
3732 | if (warned) |
3733 | printk(KERN_WARNING | |
3734 | "True protection against single-disk" | |
3735 | " failure might be compromised.\n"); | |
3736 | } | |
3737 | ||
657390d2 | 3738 | mddev->recovery = 0; |
1da177e4 | 3739 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 3740 | mddev->barriers_work = 1; |
6ff8d8ec | 3741 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3742 | |
f91de92e N |
3743 | if (start_readonly) |
3744 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3745 | ||
b15c2e57 | 3746 | err = mddev->pers->run(mddev); |
13e53df3 AN |
3747 | if (err) |
3748 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3749 | else if (mddev->pers->sync_request) { | |
b15c2e57 N |
3750 | err = bitmap_create(mddev); |
3751 | if (err) { | |
3752 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3753 | mdname(mddev), err); | |
3754 | mddev->pers->stop(mddev); | |
3755 | } | |
3756 | } | |
1da177e4 | 3757 | if (err) { |
1da177e4 LT |
3758 | module_put(mddev->pers->owner); |
3759 | mddev->pers = NULL; | |
32a7627c N |
3760 | bitmap_destroy(mddev); |
3761 | return err; | |
1da177e4 | 3762 | } |
5e55e2f5 N |
3763 | if (mddev->pers->sync_request) { |
3764 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3765 | printk(KERN_WARNING | |
3766 | "md: cannot register extra attributes for %s\n", | |
3767 | mdname(mddev)); | |
0c3573f1 | 3768 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 3769 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
3770 | mddev->ro = 0; |
3771 | ||
1da177e4 LT |
3772 | atomic_set(&mddev->writes_pending,0); |
3773 | mddev->safemode = 0; | |
3774 | mddev->safemode_timer.function = md_safemode_timeout; | |
3775 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3776 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3777 | mddev->in_sync = 1; |
86e6ffdd | 3778 | |
159ec1fc | 3779 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
3780 | if (rdev->raid_disk >= 0) { |
3781 | char nm[20]; | |
3782 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3783 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3784 | printk("md: cannot register %s for %s\n", | |
3785 | nm, mdname(mddev)); | |
86e6ffdd | 3786 | } |
1da177e4 LT |
3787 | |
3788 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3789 | ||
850b2b42 N |
3790 | if (mddev->flags) |
3791 | md_update_sb(mddev, 0); | |
1da177e4 | 3792 | |
f233ea5c | 3793 | set_capacity(disk, mddev->array_sectors); |
1da177e4 LT |
3794 | |
3795 | /* If we call blk_queue_make_request here, it will | |
3796 | * re-initialise max_sectors etc which may have been | |
3797 | * refined inside -> run. So just set the bits we need to set. | |
3798 | * Most initialisation happended when we called | |
3799 | * blk_queue_make_request(..., md_fail_request) | |
3800 | * earlier. | |
3801 | */ | |
3802 | mddev->queue->queuedata = mddev; | |
3803 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3804 | ||
5fd6c1dc N |
3805 | /* If there is a partially-recovered drive we need to |
3806 | * start recovery here. If we leave it to md_check_recovery, | |
3807 | * it will remove the drives and not do the right thing | |
3808 | */ | |
0b8c9de0 | 3809 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 3810 | int spares = 0; |
159ec1fc | 3811 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
3812 | if (rdev->raid_disk >= 0 && |
3813 | !test_bit(In_sync, &rdev->flags) && | |
3814 | !test_bit(Faulty, &rdev->flags)) | |
3815 | /* complete an interrupted recovery */ | |
3816 | spares++; | |
3817 | if (spares && mddev->pers->sync_request) { | |
3818 | mddev->recovery = 0; | |
3819 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3820 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3821 | mddev, | |
3822 | "%s_resync"); | |
3823 | if (!mddev->sync_thread) { | |
3824 | printk(KERN_ERR "%s: could not start resync" | |
3825 | " thread...\n", | |
3826 | mdname(mddev)); | |
3827 | /* leave the spares where they are, it shouldn't hurt */ | |
3828 | mddev->recovery = 0; | |
0b8c9de0 | 3829 | } |
5fd6c1dc N |
3830 | } |
3831 | } | |
0b8c9de0 N |
3832 | md_wakeup_thread(mddev->thread); |
3833 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3834 | |
44ce6294 | 3835 | mddev->changed = 1; |
d7603b7e | 3836 | md_new_event(mddev); |
b62b7590 | 3837 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
3838 | if (mddev->sysfs_action) |
3839 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 3840 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 3841 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
3842 | return 0; |
3843 | } | |
3844 | ||
3845 | static int restart_array(mddev_t *mddev) | |
3846 | { | |
3847 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 3848 | |
80fab1d7 | 3849 | /* Complain if it has no devices */ |
1da177e4 | 3850 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
3851 | return -ENXIO; |
3852 | if (!mddev->pers) | |
3853 | return -EINVAL; | |
3854 | if (!mddev->ro) | |
3855 | return -EBUSY; | |
3856 | mddev->safemode = 0; | |
3857 | mddev->ro = 0; | |
3858 | set_disk_ro(disk, 0); | |
3859 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
3860 | mdname(mddev)); | |
3861 | /* Kick recovery or resync if necessary */ | |
3862 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3863 | md_wakeup_thread(mddev->thread); | |
3864 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 3865 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 3866 | return 0; |
1da177e4 LT |
3867 | } |
3868 | ||
acc55e22 N |
3869 | /* similar to deny_write_access, but accounts for our holding a reference |
3870 | * to the file ourselves */ | |
3871 | static int deny_bitmap_write_access(struct file * file) | |
3872 | { | |
3873 | struct inode *inode = file->f_mapping->host; | |
3874 | ||
3875 | spin_lock(&inode->i_lock); | |
3876 | if (atomic_read(&inode->i_writecount) > 1) { | |
3877 | spin_unlock(&inode->i_lock); | |
3878 | return -ETXTBSY; | |
3879 | } | |
3880 | atomic_set(&inode->i_writecount, -1); | |
3881 | spin_unlock(&inode->i_lock); | |
3882 | ||
3883 | return 0; | |
3884 | } | |
3885 | ||
3886 | static void restore_bitmap_write_access(struct file *file) | |
3887 | { | |
3888 | struct inode *inode = file->f_mapping->host; | |
3889 | ||
3890 | spin_lock(&inode->i_lock); | |
3891 | atomic_set(&inode->i_writecount, 1); | |
3892 | spin_unlock(&inode->i_lock); | |
3893 | } | |
3894 | ||
9e653b63 N |
3895 | /* mode: |
3896 | * 0 - completely stop and dis-assemble array | |
3897 | * 1 - switch to readonly | |
3898 | * 2 - stop but do not disassemble array | |
3899 | */ | |
df5b20cf | 3900 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
3901 | { |
3902 | int err = 0; | |
3903 | struct gendisk *disk = mddev->gendisk; | |
3904 | ||
f2ea68cf | 3905 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf NB |
3906 | printk("md: %s still in use.\n",mdname(mddev)); |
3907 | return -EBUSY; | |
3908 | } | |
3909 | ||
1da177e4 | 3910 | if (mddev->pers) { |
1da177e4 LT |
3911 | |
3912 | if (mddev->sync_thread) { | |
5fd6c1dc | 3913 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
3914 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
3915 | md_unregister_thread(mddev->sync_thread); | |
3916 | mddev->sync_thread = NULL; | |
3917 | } | |
3918 | ||
3919 | del_timer_sync(&mddev->safemode_timer); | |
3920 | ||
9e653b63 N |
3921 | switch(mode) { |
3922 | case 1: /* readonly */ | |
1da177e4 | 3923 | err = -ENXIO; |
f91de92e | 3924 | if (mddev->ro==1) |
1da177e4 LT |
3925 | goto out; |
3926 | mddev->ro = 1; | |
9e653b63 N |
3927 | break; |
3928 | case 0: /* disassemble */ | |
3929 | case 2: /* stop */ | |
6b8b3e8a | 3930 | bitmap_flush(mddev); |
a9701a30 | 3931 | md_super_wait(mddev); |
1da177e4 LT |
3932 | if (mddev->ro) |
3933 | set_disk_ro(disk, 0); | |
3934 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3935 | mddev->pers->stop(mddev); | |
d1b5380c N |
3936 | mddev->queue->merge_bvec_fn = NULL; |
3937 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 3938 | mddev->queue->backing_dev_info.congested_fn = NULL; |
0c3573f1 | 3939 | if (mddev->pers->sync_request) { |
411036fa | 3940 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
0c3573f1 N |
3941 | if (mddev->sysfs_action) |
3942 | sysfs_put(mddev->sysfs_action); | |
3943 | mddev->sysfs_action = NULL; | |
3944 | } | |
1da177e4 LT |
3945 | module_put(mddev->pers->owner); |
3946 | mddev->pers = NULL; | |
4f54b0e9 | 3947 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 3948 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 N |
3949 | |
3950 | set_capacity(disk, 0); | |
44ce6294 | 3951 | mddev->changed = 1; |
0d4ca600 | 3952 | |
1da177e4 LT |
3953 | if (mddev->ro) |
3954 | mddev->ro = 0; | |
3955 | } | |
850b2b42 | 3956 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
3957 | /* mark array as shutdown cleanly */ |
3958 | mddev->in_sync = 1; | |
850b2b42 | 3959 | md_update_sb(mddev, 1); |
1da177e4 | 3960 | } |
9e653b63 | 3961 | if (mode == 1) |
1da177e4 | 3962 | set_disk_ro(disk, 1); |
5fd6c1dc | 3963 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 3964 | } |
32a7627c | 3965 | |
1da177e4 LT |
3966 | /* |
3967 | * Free resources if final stop | |
3968 | */ | |
9e653b63 | 3969 | if (mode == 0) { |
86e6ffdd | 3970 | mdk_rdev_t *rdev; |
0d4ca600 | 3971 | |
1da177e4 LT |
3972 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
3973 | ||
978f946b N |
3974 | bitmap_destroy(mddev); |
3975 | if (mddev->bitmap_file) { | |
acc55e22 | 3976 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
3977 | fput(mddev->bitmap_file); |
3978 | mddev->bitmap_file = NULL; | |
3979 | } | |
3980 | mddev->bitmap_offset = 0; | |
3981 | ||
159ec1fc | 3982 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
3983 | if (rdev->raid_disk >= 0) { |
3984 | char nm[20]; | |
3985 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3986 | sysfs_remove_link(&mddev->kobj, nm); | |
3987 | } | |
3988 | ||
177a99b2 | 3989 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
3990 | flush_scheduled_work(); |
3991 | ||
1da177e4 LT |
3992 | export_array(mddev); |
3993 | ||
f233ea5c | 3994 | mddev->array_sectors = 0; |
9e653b63 N |
3995 | mddev->size = 0; |
3996 | mddev->raid_disks = 0; | |
a94213b1 | 3997 | mddev->recovery_cp = 0; |
5e96ee65 | 3998 | mddev->resync_min = 0; |
c6207277 | 3999 | mddev->resync_max = MaxSector; |
08a02ecd | 4000 | mddev->reshape_position = MaxSector; |
e691063a | 4001 | mddev->external = 0; |
1ec4a939 | 4002 | mddev->persistent = 0; |
d897dbf9 N |
4003 | mddev->level = LEVEL_NONE; |
4004 | mddev->clevel[0] = 0; | |
4005 | mddev->flags = 0; | |
4006 | mddev->ro = 0; | |
4007 | mddev->metadata_type[0] = 0; | |
4008 | mddev->chunk_size = 0; | |
4009 | mddev->ctime = mddev->utime = 0; | |
4010 | mddev->layout = 0; | |
4011 | mddev->max_disks = 0; | |
4012 | mddev->events = 0; | |
4013 | mddev->delta_disks = 0; | |
4014 | mddev->new_level = LEVEL_NONE; | |
4015 | mddev->new_layout = 0; | |
4016 | mddev->new_chunk = 0; | |
4017 | mddev->curr_resync = 0; | |
4018 | mddev->resync_mismatches = 0; | |
4019 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4020 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4021 | mddev->recovery = 0; | |
4022 | mddev->in_sync = 0; | |
4023 | mddev->changed = 0; | |
4024 | mddev->degraded = 0; | |
4025 | mddev->barriers_work = 0; | |
4026 | mddev->safemode = 0; | |
934d9c23 | 4027 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
9e653b63 | 4028 | |
a8a55c38 | 4029 | } else if (mddev->pers) |
1da177e4 LT |
4030 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4031 | mdname(mddev)); | |
4032 | err = 0; | |
d7603b7e | 4033 | md_new_event(mddev); |
b62b7590 | 4034 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4035 | out: |
4036 | return err; | |
4037 | } | |
4038 | ||
fdee8ae4 | 4039 | #ifndef MODULE |
1da177e4 LT |
4040 | static void autorun_array(mddev_t *mddev) |
4041 | { | |
4042 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4043 | int err; |
4044 | ||
a757e64c | 4045 | if (list_empty(&mddev->disks)) |
1da177e4 | 4046 | return; |
1da177e4 LT |
4047 | |
4048 | printk(KERN_INFO "md: running: "); | |
4049 | ||
159ec1fc | 4050 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4051 | char b[BDEVNAME_SIZE]; |
4052 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4053 | } | |
4054 | printk("\n"); | |
4055 | ||
d710e138 | 4056 | err = do_md_run(mddev); |
1da177e4 LT |
4057 | if (err) { |
4058 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4059 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4060 | } |
4061 | } | |
4062 | ||
4063 | /* | |
4064 | * lets try to run arrays based on all disks that have arrived | |
4065 | * until now. (those are in pending_raid_disks) | |
4066 | * | |
4067 | * the method: pick the first pending disk, collect all disks with | |
4068 | * the same UUID, remove all from the pending list and put them into | |
4069 | * the 'same_array' list. Then order this list based on superblock | |
4070 | * update time (freshest comes first), kick out 'old' disks and | |
4071 | * compare superblocks. If everything's fine then run it. | |
4072 | * | |
4073 | * If "unit" is allocated, then bump its reference count | |
4074 | */ | |
4075 | static void autorun_devices(int part) | |
4076 | { | |
159ec1fc | 4077 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4078 | mddev_t *mddev; |
4079 | char b[BDEVNAME_SIZE]; | |
4080 | ||
4081 | printk(KERN_INFO "md: autorun ...\n"); | |
4082 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4083 | int unit; |
1da177e4 | 4084 | dev_t dev; |
ad01c9e3 | 4085 | LIST_HEAD(candidates); |
1da177e4 LT |
4086 | rdev0 = list_entry(pending_raid_disks.next, |
4087 | mdk_rdev_t, same_set); | |
4088 | ||
4089 | printk(KERN_INFO "md: considering %s ...\n", | |
4090 | bdevname(rdev0->bdev,b)); | |
4091 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4092 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4093 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4094 | printk(KERN_INFO "md: adding %s ...\n", | |
4095 | bdevname(rdev->bdev,b)); | |
4096 | list_move(&rdev->same_set, &candidates); | |
4097 | } | |
4098 | /* | |
4099 | * now we have a set of devices, with all of them having | |
4100 | * mostly sane superblocks. It's time to allocate the | |
4101 | * mddev. | |
4102 | */ | |
e8703fe1 N |
4103 | if (part) { |
4104 | dev = MKDEV(mdp_major, | |
4105 | rdev0->preferred_minor << MdpMinorShift); | |
4106 | unit = MINOR(dev) >> MdpMinorShift; | |
4107 | } else { | |
4108 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4109 | unit = MINOR(dev); | |
4110 | } | |
4111 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4112 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4113 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4114 | break; | |
4115 | } | |
1da177e4 LT |
4116 | |
4117 | md_probe(dev, NULL, NULL); | |
4118 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4119 | if (!mddev || !mddev->gendisk) { |
4120 | if (mddev) | |
4121 | mddev_put(mddev); | |
4122 | printk(KERN_ERR | |
1da177e4 LT |
4123 | "md: cannot allocate memory for md drive.\n"); |
4124 | break; | |
4125 | } | |
4126 | if (mddev_lock(mddev)) | |
4127 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4128 | mdname(mddev)); | |
4129 | else if (mddev->raid_disks || mddev->major_version | |
4130 | || !list_empty(&mddev->disks)) { | |
4131 | printk(KERN_WARNING | |
4132 | "md: %s already running, cannot run %s\n", | |
4133 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4134 | mddev_unlock(mddev); | |
4135 | } else { | |
4136 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4137 | mddev->persistent = 1; |
159ec1fc | 4138 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4139 | list_del_init(&rdev->same_set); |
4140 | if (bind_rdev_to_array(rdev, mddev)) | |
4141 | export_rdev(rdev); | |
4142 | } | |
4143 | autorun_array(mddev); | |
4144 | mddev_unlock(mddev); | |
4145 | } | |
4146 | /* on success, candidates will be empty, on error | |
4147 | * it won't... | |
4148 | */ | |
159ec1fc | 4149 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4150 | list_del_init(&rdev->same_set); |
1da177e4 | 4151 | export_rdev(rdev); |
4b80991c | 4152 | } |
1da177e4 LT |
4153 | mddev_put(mddev); |
4154 | } | |
4155 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4156 | } | |
fdee8ae4 | 4157 | #endif /* !MODULE */ |
1da177e4 | 4158 | |
1da177e4 LT |
4159 | static int get_version(void __user * arg) |
4160 | { | |
4161 | mdu_version_t ver; | |
4162 | ||
4163 | ver.major = MD_MAJOR_VERSION; | |
4164 | ver.minor = MD_MINOR_VERSION; | |
4165 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4166 | ||
4167 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4168 | return -EFAULT; | |
4169 | ||
4170 | return 0; | |
4171 | } | |
4172 | ||
4173 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4174 | { | |
4175 | mdu_array_info_t info; | |
4176 | int nr,working,active,failed,spare; | |
4177 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4178 | |
4179 | nr=working=active=failed=spare=0; | |
159ec1fc | 4180 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4181 | nr++; |
b2d444d7 | 4182 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4183 | failed++; |
4184 | else { | |
4185 | working++; | |
b2d444d7 | 4186 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4187 | active++; |
4188 | else | |
4189 | spare++; | |
4190 | } | |
4191 | } | |
4192 | ||
4193 | info.major_version = mddev->major_version; | |
4194 | info.minor_version = mddev->minor_version; | |
4195 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4196 | info.ctime = mddev->ctime; | |
4197 | info.level = mddev->level; | |
4198 | info.size = mddev->size; | |
284ae7ca N |
4199 | if (info.size != mddev->size) /* overflow */ |
4200 | info.size = -1; | |
1da177e4 LT |
4201 | info.nr_disks = nr; |
4202 | info.raid_disks = mddev->raid_disks; | |
4203 | info.md_minor = mddev->md_minor; | |
4204 | info.not_persistent= !mddev->persistent; | |
4205 | ||
4206 | info.utime = mddev->utime; | |
4207 | info.state = 0; | |
4208 | if (mddev->in_sync) | |
4209 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4210 | if (mddev->bitmap && mddev->bitmap_offset) |
4211 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4212 | info.active_disks = active; |
4213 | info.working_disks = working; | |
4214 | info.failed_disks = failed; | |
4215 | info.spare_disks = spare; | |
4216 | ||
4217 | info.layout = mddev->layout; | |
4218 | info.chunk_size = mddev->chunk_size; | |
4219 | ||
4220 | if (copy_to_user(arg, &info, sizeof(info))) | |
4221 | return -EFAULT; | |
4222 | ||
4223 | return 0; | |
4224 | } | |
4225 | ||
87162a28 | 4226 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4227 | { |
4228 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4229 | char *ptr, *buf = NULL; | |
4230 | int err = -ENOMEM; | |
4231 | ||
b5470dc5 DW |
4232 | if (md_allow_write(mddev)) |
4233 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4234 | else | |
4235 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4236 | |
32a7627c N |
4237 | if (!file) |
4238 | goto out; | |
4239 | ||
4240 | /* bitmap disabled, zero the first byte and copy out */ | |
4241 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4242 | file->pathname[0] = '\0'; | |
4243 | goto copy_out; | |
4244 | } | |
4245 | ||
4246 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4247 | if (!buf) | |
4248 | goto out; | |
4249 | ||
6bcfd601 CH |
4250 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4251 | if (IS_ERR(ptr)) | |
32a7627c N |
4252 | goto out; |
4253 | ||
4254 | strcpy(file->pathname, ptr); | |
4255 | ||
4256 | copy_out: | |
4257 | err = 0; | |
4258 | if (copy_to_user(arg, file, sizeof(*file))) | |
4259 | err = -EFAULT; | |
4260 | out: | |
4261 | kfree(buf); | |
4262 | kfree(file); | |
4263 | return err; | |
4264 | } | |
4265 | ||
1da177e4 LT |
4266 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4267 | { | |
4268 | mdu_disk_info_t info; | |
1da177e4 LT |
4269 | mdk_rdev_t *rdev; |
4270 | ||
4271 | if (copy_from_user(&info, arg, sizeof(info))) | |
4272 | return -EFAULT; | |
4273 | ||
26ef379f | 4274 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4275 | if (rdev) { |
4276 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4277 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4278 | info.raid_disk = rdev->raid_disk; | |
4279 | info.state = 0; | |
b2d444d7 | 4280 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4281 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4282 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4283 | info.state |= (1<<MD_DISK_ACTIVE); |
4284 | info.state |= (1<<MD_DISK_SYNC); | |
4285 | } | |
8ddf9efe N |
4286 | if (test_bit(WriteMostly, &rdev->flags)) |
4287 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4288 | } else { |
4289 | info.major = info.minor = 0; | |
4290 | info.raid_disk = -1; | |
4291 | info.state = (1<<MD_DISK_REMOVED); | |
4292 | } | |
4293 | ||
4294 | if (copy_to_user(arg, &info, sizeof(info))) | |
4295 | return -EFAULT; | |
4296 | ||
4297 | return 0; | |
4298 | } | |
4299 | ||
4300 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4301 | { | |
4302 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4303 | mdk_rdev_t *rdev; | |
4304 | dev_t dev = MKDEV(info->major,info->minor); | |
4305 | ||
4306 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4307 | return -EOVERFLOW; | |
4308 | ||
4309 | if (!mddev->raid_disks) { | |
4310 | int err; | |
4311 | /* expecting a device which has a superblock */ | |
4312 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4313 | if (IS_ERR(rdev)) { | |
4314 | printk(KERN_WARNING | |
4315 | "md: md_import_device returned %ld\n", | |
4316 | PTR_ERR(rdev)); | |
4317 | return PTR_ERR(rdev); | |
4318 | } | |
4319 | if (!list_empty(&mddev->disks)) { | |
4320 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4321 | mdk_rdev_t, same_set); | |
4322 | int err = super_types[mddev->major_version] | |
4323 | .load_super(rdev, rdev0, mddev->minor_version); | |
4324 | if (err < 0) { | |
4325 | printk(KERN_WARNING | |
4326 | "md: %s has different UUID to %s\n", | |
4327 | bdevname(rdev->bdev,b), | |
4328 | bdevname(rdev0->bdev,b2)); | |
4329 | export_rdev(rdev); | |
4330 | return -EINVAL; | |
4331 | } | |
4332 | } | |
4333 | err = bind_rdev_to_array(rdev, mddev); | |
4334 | if (err) | |
4335 | export_rdev(rdev); | |
4336 | return err; | |
4337 | } | |
4338 | ||
4339 | /* | |
4340 | * add_new_disk can be used once the array is assembled | |
4341 | * to add "hot spares". They must already have a superblock | |
4342 | * written | |
4343 | */ | |
4344 | if (mddev->pers) { | |
4345 | int err; | |
4346 | if (!mddev->pers->hot_add_disk) { | |
4347 | printk(KERN_WARNING | |
4348 | "%s: personality does not support diskops!\n", | |
4349 | mdname(mddev)); | |
4350 | return -EINVAL; | |
4351 | } | |
7b1e35f6 N |
4352 | if (mddev->persistent) |
4353 | rdev = md_import_device(dev, mddev->major_version, | |
4354 | mddev->minor_version); | |
4355 | else | |
4356 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4357 | if (IS_ERR(rdev)) { |
4358 | printk(KERN_WARNING | |
4359 | "md: md_import_device returned %ld\n", | |
4360 | PTR_ERR(rdev)); | |
4361 | return PTR_ERR(rdev); | |
4362 | } | |
41158c7e N |
4363 | /* set save_raid_disk if appropriate */ |
4364 | if (!mddev->persistent) { | |
4365 | if (info->state & (1<<MD_DISK_SYNC) && | |
4366 | info->raid_disk < mddev->raid_disks) | |
4367 | rdev->raid_disk = info->raid_disk; | |
4368 | else | |
4369 | rdev->raid_disk = -1; | |
4370 | } else | |
4371 | super_types[mddev->major_version]. | |
4372 | validate_super(mddev, rdev); | |
4373 | rdev->saved_raid_disk = rdev->raid_disk; | |
4374 | ||
b2d444d7 | 4375 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4376 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4377 | set_bit(WriteMostly, &rdev->flags); | |
4378 | ||
1da177e4 LT |
4379 | rdev->raid_disk = -1; |
4380 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4381 | if (!err && !mddev->pers->hot_remove_disk) { |
4382 | /* If there is hot_add_disk but no hot_remove_disk | |
4383 | * then added disks for geometry changes, | |
4384 | * and should be added immediately. | |
4385 | */ | |
4386 | super_types[mddev->major_version]. | |
4387 | validate_super(mddev, rdev); | |
4388 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4389 | if (err) | |
4390 | unbind_rdev_from_array(rdev); | |
4391 | } | |
1da177e4 LT |
4392 | if (err) |
4393 | export_rdev(rdev); | |
52664732 | 4394 | else |
3c0ee63a | 4395 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4396 | |
17571284 | 4397 | md_update_sb(mddev, 1); |
72a23c21 NB |
4398 | if (mddev->degraded) |
4399 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4400 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4401 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4402 | return err; |
4403 | } | |
4404 | ||
4405 | /* otherwise, add_new_disk is only allowed | |
4406 | * for major_version==0 superblocks | |
4407 | */ | |
4408 | if (mddev->major_version != 0) { | |
4409 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4410 | mdname(mddev)); | |
4411 | return -EINVAL; | |
4412 | } | |
4413 | ||
4414 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4415 | int err; | |
d710e138 | 4416 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4417 | if (IS_ERR(rdev)) { |
4418 | printk(KERN_WARNING | |
4419 | "md: error, md_import_device() returned %ld\n", | |
4420 | PTR_ERR(rdev)); | |
4421 | return PTR_ERR(rdev); | |
4422 | } | |
4423 | rdev->desc_nr = info->number; | |
4424 | if (info->raid_disk < mddev->raid_disks) | |
4425 | rdev->raid_disk = info->raid_disk; | |
4426 | else | |
4427 | rdev->raid_disk = -1; | |
4428 | ||
1da177e4 | 4429 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4430 | if (info->state & (1<<MD_DISK_SYNC)) |
4431 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4432 | |
8ddf9efe N |
4433 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4434 | set_bit(WriteMostly, &rdev->flags); | |
4435 | ||
1da177e4 LT |
4436 | if (!mddev->persistent) { |
4437 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4438 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4439 | } else |
0f420358 | 4440 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
e7debaa4 | 4441 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4442 | |
2bf071bf N |
4443 | err = bind_rdev_to_array(rdev, mddev); |
4444 | if (err) { | |
4445 | export_rdev(rdev); | |
4446 | return err; | |
4447 | } | |
1da177e4 LT |
4448 | } |
4449 | ||
4450 | return 0; | |
4451 | } | |
4452 | ||
4453 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4454 | { | |
4455 | char b[BDEVNAME_SIZE]; | |
4456 | mdk_rdev_t *rdev; | |
4457 | ||
1da177e4 LT |
4458 | rdev = find_rdev(mddev, dev); |
4459 | if (!rdev) | |
4460 | return -ENXIO; | |
4461 | ||
4462 | if (rdev->raid_disk >= 0) | |
4463 | goto busy; | |
4464 | ||
4465 | kick_rdev_from_array(rdev); | |
850b2b42 | 4466 | md_update_sb(mddev, 1); |
d7603b7e | 4467 | md_new_event(mddev); |
1da177e4 LT |
4468 | |
4469 | return 0; | |
4470 | busy: | |
fdefa4d8 | 4471 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4472 | bdevname(rdev->bdev,b), mdname(mddev)); |
4473 | return -EBUSY; | |
4474 | } | |
4475 | ||
4476 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4477 | { | |
4478 | char b[BDEVNAME_SIZE]; | |
4479 | int err; | |
1da177e4 LT |
4480 | mdk_rdev_t *rdev; |
4481 | ||
4482 | if (!mddev->pers) | |
4483 | return -ENODEV; | |
4484 | ||
4485 | if (mddev->major_version != 0) { | |
4486 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4487 | " version-0 superblocks.\n", | |
4488 | mdname(mddev)); | |
4489 | return -EINVAL; | |
4490 | } | |
4491 | if (!mddev->pers->hot_add_disk) { | |
4492 | printk(KERN_WARNING | |
4493 | "%s: personality does not support diskops!\n", | |
4494 | mdname(mddev)); | |
4495 | return -EINVAL; | |
4496 | } | |
4497 | ||
d710e138 | 4498 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4499 | if (IS_ERR(rdev)) { |
4500 | printk(KERN_WARNING | |
4501 | "md: error, md_import_device() returned %ld\n", | |
4502 | PTR_ERR(rdev)); | |
4503 | return -EINVAL; | |
4504 | } | |
4505 | ||
4506 | if (mddev->persistent) | |
0f420358 | 4507 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4508 | else |
0f420358 | 4509 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4510 | |
e7debaa4 | 4511 | rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2; |
1da177e4 | 4512 | |
b2d444d7 | 4513 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4514 | printk(KERN_WARNING |
4515 | "md: can not hot-add faulty %s disk to %s!\n", | |
4516 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4517 | err = -EINVAL; | |
4518 | goto abort_export; | |
4519 | } | |
b2d444d7 | 4520 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4521 | rdev->desc_nr = -1; |
5842730d | 4522 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4523 | err = bind_rdev_to_array(rdev, mddev); |
4524 | if (err) | |
4525 | goto abort_export; | |
1da177e4 LT |
4526 | |
4527 | /* | |
4528 | * The rest should better be atomic, we can have disk failures | |
4529 | * noticed in interrupt contexts ... | |
4530 | */ | |
4531 | ||
4532 | if (rdev->desc_nr == mddev->max_disks) { | |
4533 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
4534 | mdname(mddev)); | |
4535 | err = -EBUSY; | |
4536 | goto abort_unbind_export; | |
4537 | } | |
4538 | ||
4539 | rdev->raid_disk = -1; | |
4540 | ||
850b2b42 | 4541 | md_update_sb(mddev, 1); |
1da177e4 LT |
4542 | |
4543 | /* | |
4544 | * Kick recovery, maybe this spare has to be added to the | |
4545 | * array immediately. | |
4546 | */ | |
4547 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4548 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4549 | md_new_event(mddev); |
1da177e4 LT |
4550 | return 0; |
4551 | ||
4552 | abort_unbind_export: | |
4553 | unbind_rdev_from_array(rdev); | |
4554 | ||
4555 | abort_export: | |
4556 | export_rdev(rdev); | |
4557 | return err; | |
4558 | } | |
4559 | ||
32a7627c N |
4560 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4561 | { | |
4562 | int err; | |
4563 | ||
36fa3063 N |
4564 | if (mddev->pers) { |
4565 | if (!mddev->pers->quiesce) | |
4566 | return -EBUSY; | |
4567 | if (mddev->recovery || mddev->sync_thread) | |
4568 | return -EBUSY; | |
4569 | /* we should be able to change the bitmap.. */ | |
4570 | } | |
32a7627c | 4571 | |
32a7627c | 4572 | |
36fa3063 N |
4573 | if (fd >= 0) { |
4574 | if (mddev->bitmap) | |
4575 | return -EEXIST; /* cannot add when bitmap is present */ | |
4576 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4577 | |
36fa3063 N |
4578 | if (mddev->bitmap_file == NULL) { |
4579 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4580 | mdname(mddev)); | |
4581 | return -EBADF; | |
4582 | } | |
4583 | ||
4584 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4585 | if (err) { | |
4586 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4587 | mdname(mddev)); | |
4588 | fput(mddev->bitmap_file); | |
4589 | mddev->bitmap_file = NULL; | |
4590 | return err; | |
4591 | } | |
a654b9d8 | 4592 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4593 | } else if (mddev->bitmap == NULL) |
4594 | return -ENOENT; /* cannot remove what isn't there */ | |
4595 | err = 0; | |
4596 | if (mddev->pers) { | |
4597 | mddev->pers->quiesce(mddev, 1); | |
4598 | if (fd >= 0) | |
4599 | err = bitmap_create(mddev); | |
d7375ab3 | 4600 | if (fd < 0 || err) { |
36fa3063 | 4601 | bitmap_destroy(mddev); |
d7375ab3 N |
4602 | fd = -1; /* make sure to put the file */ |
4603 | } | |
36fa3063 | 4604 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4605 | } |
4606 | if (fd < 0) { | |
acc55e22 N |
4607 | if (mddev->bitmap_file) { |
4608 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4609 | fput(mddev->bitmap_file); |
acc55e22 | 4610 | } |
36fa3063 N |
4611 | mddev->bitmap_file = NULL; |
4612 | } | |
4613 | ||
32a7627c N |
4614 | return err; |
4615 | } | |
4616 | ||
1da177e4 LT |
4617 | /* |
4618 | * set_array_info is used two different ways | |
4619 | * The original usage is when creating a new array. | |
4620 | * In this usage, raid_disks is > 0 and it together with | |
4621 | * level, size, not_persistent,layout,chunksize determine the | |
4622 | * shape of the array. | |
4623 | * This will always create an array with a type-0.90.0 superblock. | |
4624 | * The newer usage is when assembling an array. | |
4625 | * In this case raid_disks will be 0, and the major_version field is | |
4626 | * use to determine which style super-blocks are to be found on the devices. | |
4627 | * The minor and patch _version numbers are also kept incase the | |
4628 | * super_block handler wishes to interpret them. | |
4629 | */ | |
4630 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4631 | { | |
4632 | ||
4633 | if (info->raid_disks == 0) { | |
4634 | /* just setting version number for superblock loading */ | |
4635 | if (info->major_version < 0 || | |
50511da3 | 4636 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4637 | super_types[info->major_version].name == NULL) { |
4638 | /* maybe try to auto-load a module? */ | |
4639 | printk(KERN_INFO | |
4640 | "md: superblock version %d not known\n", | |
4641 | info->major_version); | |
4642 | return -EINVAL; | |
4643 | } | |
4644 | mddev->major_version = info->major_version; | |
4645 | mddev->minor_version = info->minor_version; | |
4646 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4647 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4648 | return 0; |
4649 | } | |
4650 | mddev->major_version = MD_MAJOR_VERSION; | |
4651 | mddev->minor_version = MD_MINOR_VERSION; | |
4652 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4653 | mddev->ctime = get_seconds(); | |
4654 | ||
4655 | mddev->level = info->level; | |
17115e03 | 4656 | mddev->clevel[0] = 0; |
1da177e4 LT |
4657 | mddev->size = info->size; |
4658 | mddev->raid_disks = info->raid_disks; | |
4659 | /* don't set md_minor, it is determined by which /dev/md* was | |
4660 | * openned | |
4661 | */ | |
4662 | if (info->state & (1<<MD_SB_CLEAN)) | |
4663 | mddev->recovery_cp = MaxSector; | |
4664 | else | |
4665 | mddev->recovery_cp = 0; | |
4666 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4667 | mddev->external = 0; |
1da177e4 LT |
4668 | |
4669 | mddev->layout = info->layout; | |
4670 | mddev->chunk_size = info->chunk_size; | |
4671 | ||
4672 | mddev->max_disks = MD_SB_DISKS; | |
4673 | ||
e691063a N |
4674 | if (mddev->persistent) |
4675 | mddev->flags = 0; | |
850b2b42 | 4676 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4677 | |
b2a2703c N |
4678 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4679 | mddev->bitmap_offset = 0; | |
4680 | ||
f6705578 N |
4681 | mddev->reshape_position = MaxSector; |
4682 | ||
1da177e4 LT |
4683 | /* |
4684 | * Generate a 128 bit UUID | |
4685 | */ | |
4686 | get_random_bytes(mddev->uuid, 16); | |
4687 | ||
f6705578 N |
4688 | mddev->new_level = mddev->level; |
4689 | mddev->new_chunk = mddev->chunk_size; | |
4690 | mddev->new_layout = mddev->layout; | |
4691 | mddev->delta_disks = 0; | |
4692 | ||
1da177e4 LT |
4693 | return 0; |
4694 | } | |
4695 | ||
d71f9f88 | 4696 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 4697 | { |
159ec1fc | 4698 | mdk_rdev_t *rdev; |
a35b0d69 | 4699 | int rv; |
d71f9f88 | 4700 | int fit = (num_sectors == 0); |
a35b0d69 N |
4701 | |
4702 | if (mddev->pers->resize == NULL) | |
4703 | return -EINVAL; | |
d71f9f88 AN |
4704 | /* The "num_sectors" is the number of sectors of each device that |
4705 | * is used. This can only make sense for arrays with redundancy. | |
4706 | * linear and raid0 always use whatever space is available. We can only | |
4707 | * consider changing this number if no resync or reconstruction is | |
4708 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 4709 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
4710 | * of each device. If num_sectors is zero, we find the largest size |
4711 | * that fits. | |
4712 | ||
a35b0d69 N |
4713 | */ |
4714 | if (mddev->sync_thread) | |
4715 | return -EBUSY; | |
dba034ee N |
4716 | if (mddev->bitmap) |
4717 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
4718 | * grow, and re-add. | |
4719 | */ | |
4720 | return -EBUSY; | |
159ec1fc | 4721 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
a35b0d69 | 4722 | sector_t avail; |
01ab5662 N |
4723 | avail = rdev->size * 2; |
4724 | ||
d71f9f88 AN |
4725 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
4726 | num_sectors = avail; | |
4727 | if (avail < num_sectors) | |
a35b0d69 N |
4728 | return -ENOSPC; |
4729 | } | |
d71f9f88 | 4730 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
4731 | if (!rv) { |
4732 | struct block_device *bdev; | |
4733 | ||
4734 | bdev = bdget_disk(mddev->gendisk, 0); | |
4735 | if (bdev) { | |
1b1dcc1b | 4736 | mutex_lock(&bdev->bd_inode->i_mutex); |
f233ea5c AN |
4737 | i_size_write(bdev->bd_inode, |
4738 | (loff_t)mddev->array_sectors << 9); | |
1b1dcc1b | 4739 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4740 | bdput(bdev); |
4741 | } | |
4742 | } | |
4743 | return rv; | |
4744 | } | |
4745 | ||
da943b99 N |
4746 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4747 | { | |
4748 | int rv; | |
4749 | /* change the number of raid disks */ | |
63c70c4f | 4750 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4751 | return -EINVAL; |
4752 | if (raid_disks <= 0 || | |
4753 | raid_disks >= mddev->max_disks) | |
4754 | return -EINVAL; | |
63c70c4f | 4755 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4756 | return -EBUSY; |
63c70c4f N |
4757 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4758 | ||
4759 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4760 | return rv; |
4761 | } | |
4762 | ||
4763 | ||
1da177e4 LT |
4764 | /* |
4765 | * update_array_info is used to change the configuration of an | |
4766 | * on-line array. | |
4767 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4768 | * fields in the info are checked against the array. | |
4769 | * Any differences that cannot be handled will cause an error. | |
4770 | * Normally, only one change can be managed at a time. | |
4771 | */ | |
4772 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4773 | { | |
4774 | int rv = 0; | |
4775 | int cnt = 0; | |
36fa3063 N |
4776 | int state = 0; |
4777 | ||
4778 | /* calculate expected state,ignoring low bits */ | |
4779 | if (mddev->bitmap && mddev->bitmap_offset) | |
4780 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4781 | |
4782 | if (mddev->major_version != info->major_version || | |
4783 | mddev->minor_version != info->minor_version || | |
4784 | /* mddev->patch_version != info->patch_version || */ | |
4785 | mddev->ctime != info->ctime || | |
4786 | mddev->level != info->level || | |
4787 | /* mddev->layout != info->layout || */ | |
4788 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4789 | mddev->chunk_size != info->chunk_size || |
4790 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4791 | ((state^info->state) & 0xfffffe00) | |
4792 | ) | |
1da177e4 LT |
4793 | return -EINVAL; |
4794 | /* Check there is only one change */ | |
284ae7ca | 4795 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
4796 | if (mddev->raid_disks != info->raid_disks) cnt++; |
4797 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 4798 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
4799 | if (cnt == 0) return 0; |
4800 | if (cnt > 1) return -EINVAL; | |
4801 | ||
4802 | if (mddev->layout != info->layout) { | |
4803 | /* Change layout | |
4804 | * we don't need to do anything at the md level, the | |
4805 | * personality will take care of it all. | |
4806 | */ | |
4807 | if (mddev->pers->reconfig == NULL) | |
4808 | return -EINVAL; | |
4809 | else | |
4810 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4811 | } | |
284ae7ca | 4812 | if (info->size >= 0 && mddev->size != info->size) |
d71f9f88 | 4813 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 4814 | |
da943b99 N |
4815 | if (mddev->raid_disks != info->raid_disks) |
4816 | rv = update_raid_disks(mddev, info->raid_disks); | |
4817 | ||
36fa3063 N |
4818 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4819 | if (mddev->pers->quiesce == NULL) | |
4820 | return -EINVAL; | |
4821 | if (mddev->recovery || mddev->sync_thread) | |
4822 | return -EBUSY; | |
4823 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4824 | /* add the bitmap */ | |
4825 | if (mddev->bitmap) | |
4826 | return -EEXIST; | |
4827 | if (mddev->default_bitmap_offset == 0) | |
4828 | return -EINVAL; | |
4829 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4830 | mddev->pers->quiesce(mddev, 1); | |
4831 | rv = bitmap_create(mddev); | |
4832 | if (rv) | |
4833 | bitmap_destroy(mddev); | |
4834 | mddev->pers->quiesce(mddev, 0); | |
4835 | } else { | |
4836 | /* remove the bitmap */ | |
4837 | if (!mddev->bitmap) | |
4838 | return -ENOENT; | |
4839 | if (mddev->bitmap->file) | |
4840 | return -EINVAL; | |
4841 | mddev->pers->quiesce(mddev, 1); | |
4842 | bitmap_destroy(mddev); | |
4843 | mddev->pers->quiesce(mddev, 0); | |
4844 | mddev->bitmap_offset = 0; | |
4845 | } | |
4846 | } | |
850b2b42 | 4847 | md_update_sb(mddev, 1); |
1da177e4 LT |
4848 | return rv; |
4849 | } | |
4850 | ||
4851 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4852 | { | |
4853 | mdk_rdev_t *rdev; | |
4854 | ||
4855 | if (mddev->pers == NULL) | |
4856 | return -ENODEV; | |
4857 | ||
4858 | rdev = find_rdev(mddev, dev); | |
4859 | if (!rdev) | |
4860 | return -ENODEV; | |
4861 | ||
4862 | md_error(mddev, rdev); | |
4863 | return 0; | |
4864 | } | |
4865 | ||
2f9618ce AN |
4866 | /* |
4867 | * We have a problem here : there is no easy way to give a CHS | |
4868 | * virtual geometry. We currently pretend that we have a 2 heads | |
4869 | * 4 sectors (with a BIG number of cylinders...). This drives | |
4870 | * dosfs just mad... ;-) | |
4871 | */ | |
a885c8c4 CH |
4872 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
4873 | { | |
4874 | mddev_t *mddev = bdev->bd_disk->private_data; | |
4875 | ||
4876 | geo->heads = 2; | |
4877 | geo->sectors = 4; | |
4878 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
4879 | return 0; | |
4880 | } | |
4881 | ||
a39907fa | 4882 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
4883 | unsigned int cmd, unsigned long arg) |
4884 | { | |
4885 | int err = 0; | |
4886 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
4887 | mddev_t *mddev = NULL; |
4888 | ||
4889 | if (!capable(CAP_SYS_ADMIN)) | |
4890 | return -EACCES; | |
4891 | ||
4892 | /* | |
4893 | * Commands dealing with the RAID driver but not any | |
4894 | * particular array: | |
4895 | */ | |
4896 | switch (cmd) | |
4897 | { | |
4898 | case RAID_VERSION: | |
4899 | err = get_version(argp); | |
4900 | goto done; | |
4901 | ||
4902 | case PRINT_RAID_DEBUG: | |
4903 | err = 0; | |
4904 | md_print_devices(); | |
4905 | goto done; | |
4906 | ||
4907 | #ifndef MODULE | |
4908 | case RAID_AUTORUN: | |
4909 | err = 0; | |
4910 | autostart_arrays(arg); | |
4911 | goto done; | |
4912 | #endif | |
4913 | default:; | |
4914 | } | |
4915 | ||
4916 | /* | |
4917 | * Commands creating/starting a new array: | |
4918 | */ | |
4919 | ||
a39907fa | 4920 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
4921 | |
4922 | if (!mddev) { | |
4923 | BUG(); | |
4924 | goto abort; | |
4925 | } | |
4926 | ||
1da177e4 LT |
4927 | err = mddev_lock(mddev); |
4928 | if (err) { | |
4929 | printk(KERN_INFO | |
4930 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
4931 | err, cmd); | |
4932 | goto abort; | |
4933 | } | |
4934 | ||
4935 | switch (cmd) | |
4936 | { | |
4937 | case SET_ARRAY_INFO: | |
4938 | { | |
4939 | mdu_array_info_t info; | |
4940 | if (!arg) | |
4941 | memset(&info, 0, sizeof(info)); | |
4942 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
4943 | err = -EFAULT; | |
4944 | goto abort_unlock; | |
4945 | } | |
4946 | if (mddev->pers) { | |
4947 | err = update_array_info(mddev, &info); | |
4948 | if (err) { | |
4949 | printk(KERN_WARNING "md: couldn't update" | |
4950 | " array info. %d\n", err); | |
4951 | goto abort_unlock; | |
4952 | } | |
4953 | goto done_unlock; | |
4954 | } | |
4955 | if (!list_empty(&mddev->disks)) { | |
4956 | printk(KERN_WARNING | |
4957 | "md: array %s already has disks!\n", | |
4958 | mdname(mddev)); | |
4959 | err = -EBUSY; | |
4960 | goto abort_unlock; | |
4961 | } | |
4962 | if (mddev->raid_disks) { | |
4963 | printk(KERN_WARNING | |
4964 | "md: array %s already initialised!\n", | |
4965 | mdname(mddev)); | |
4966 | err = -EBUSY; | |
4967 | goto abort_unlock; | |
4968 | } | |
4969 | err = set_array_info(mddev, &info); | |
4970 | if (err) { | |
4971 | printk(KERN_WARNING "md: couldn't set" | |
4972 | " array info. %d\n", err); | |
4973 | goto abort_unlock; | |
4974 | } | |
4975 | } | |
4976 | goto done_unlock; | |
4977 | ||
4978 | default:; | |
4979 | } | |
4980 | ||
4981 | /* | |
4982 | * Commands querying/configuring an existing array: | |
4983 | */ | |
32a7627c | 4984 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 4985 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
4986 | if ((!mddev->raid_disks && !mddev->external) |
4987 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
4988 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
4989 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
4990 | err = -ENODEV; |
4991 | goto abort_unlock; | |
4992 | } | |
4993 | ||
4994 | /* | |
4995 | * Commands even a read-only array can execute: | |
4996 | */ | |
4997 | switch (cmd) | |
4998 | { | |
4999 | case GET_ARRAY_INFO: | |
5000 | err = get_array_info(mddev, argp); | |
5001 | goto done_unlock; | |
5002 | ||
32a7627c | 5003 | case GET_BITMAP_FILE: |
87162a28 | 5004 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5005 | goto done_unlock; |
5006 | ||
1da177e4 LT |
5007 | case GET_DISK_INFO: |
5008 | err = get_disk_info(mddev, argp); | |
5009 | goto done_unlock; | |
5010 | ||
5011 | case RESTART_ARRAY_RW: | |
5012 | err = restart_array(mddev); | |
5013 | goto done_unlock; | |
5014 | ||
5015 | case STOP_ARRAY: | |
d710e138 | 5016 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5017 | goto done_unlock; |
5018 | ||
5019 | case STOP_ARRAY_RO: | |
d710e138 | 5020 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
5021 | goto done_unlock; |
5022 | ||
1da177e4 LT |
5023 | } |
5024 | ||
5025 | /* | |
5026 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5027 | * superblock, so we do not allow them on read-only arrays. |
5028 | * However non-MD ioctls (e.g. get-size) will still come through | |
5029 | * here and hit the 'default' below, so only disallow | |
5030 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5031 | */ |
bb57fc64 | 5032 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5033 | if (mddev->ro == 2) { |
5034 | mddev->ro = 0; | |
b62b7590 | 5035 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5036 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5037 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5038 | } else { |
5039 | err = -EROFS; | |
5040 | goto abort_unlock; | |
5041 | } | |
1da177e4 LT |
5042 | } |
5043 | ||
5044 | switch (cmd) | |
5045 | { | |
5046 | case ADD_NEW_DISK: | |
5047 | { | |
5048 | mdu_disk_info_t info; | |
5049 | if (copy_from_user(&info, argp, sizeof(info))) | |
5050 | err = -EFAULT; | |
5051 | else | |
5052 | err = add_new_disk(mddev, &info); | |
5053 | goto done_unlock; | |
5054 | } | |
5055 | ||
5056 | case HOT_REMOVE_DISK: | |
5057 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5058 | goto done_unlock; | |
5059 | ||
5060 | case HOT_ADD_DISK: | |
5061 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5062 | goto done_unlock; | |
5063 | ||
5064 | case SET_DISK_FAULTY: | |
5065 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5066 | goto done_unlock; | |
5067 | ||
5068 | case RUN_ARRAY: | |
d710e138 | 5069 | err = do_md_run(mddev); |
1da177e4 LT |
5070 | goto done_unlock; |
5071 | ||
32a7627c N |
5072 | case SET_BITMAP_FILE: |
5073 | err = set_bitmap_file(mddev, (int)arg); | |
5074 | goto done_unlock; | |
5075 | ||
1da177e4 | 5076 | default: |
1da177e4 LT |
5077 | err = -EINVAL; |
5078 | goto abort_unlock; | |
5079 | } | |
5080 | ||
5081 | done_unlock: | |
5082 | abort_unlock: | |
d3374825 N |
5083 | if (mddev->hold_active == UNTIL_IOCTL && |
5084 | err != -EINVAL) | |
5085 | mddev->hold_active = 0; | |
1da177e4 LT |
5086 | mddev_unlock(mddev); |
5087 | ||
5088 | return err; | |
5089 | done: | |
5090 | if (err) | |
5091 | MD_BUG(); | |
5092 | abort: | |
5093 | return err; | |
5094 | } | |
5095 | ||
a39907fa | 5096 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5097 | { |
5098 | /* | |
5099 | * Succeed if we can lock the mddev, which confirms that | |
5100 | * it isn't being stopped right now. | |
5101 | */ | |
d3374825 | 5102 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5103 | int err; |
5104 | ||
d3374825 N |
5105 | if (mddev->gendisk != bdev->bd_disk) { |
5106 | /* we are racing with mddev_put which is discarding this | |
5107 | * bd_disk. | |
5108 | */ | |
5109 | mddev_put(mddev); | |
5110 | /* Wait until bdev->bd_disk is definitely gone */ | |
5111 | flush_scheduled_work(); | |
5112 | /* Then retry the open from the top */ | |
5113 | return -ERESTARTSYS; | |
5114 | } | |
5115 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5116 | ||
d63a5a74 | 5117 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5118 | goto out; |
5119 | ||
5120 | err = 0; | |
f2ea68cf | 5121 | atomic_inc(&mddev->openers); |
1da177e4 LT |
5122 | mddev_unlock(mddev); |
5123 | ||
a39907fa | 5124 | check_disk_change(bdev); |
1da177e4 LT |
5125 | out: |
5126 | return err; | |
5127 | } | |
5128 | ||
a39907fa | 5129 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5130 | { |
a39907fa | 5131 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5132 | |
52e5f9d1 | 5133 | BUG_ON(!mddev); |
f2ea68cf | 5134 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5135 | mddev_put(mddev); |
5136 | ||
5137 | return 0; | |
5138 | } | |
5139 | ||
44ce6294 LT |
5140 | static int md_media_changed(struct gendisk *disk) |
5141 | { | |
5142 | mddev_t *mddev = disk->private_data; | |
5143 | ||
5144 | return mddev->changed; | |
5145 | } | |
5146 | ||
5147 | static int md_revalidate(struct gendisk *disk) | |
5148 | { | |
5149 | mddev_t *mddev = disk->private_data; | |
5150 | ||
5151 | mddev->changed = 0; | |
5152 | return 0; | |
5153 | } | |
1da177e4 LT |
5154 | static struct block_device_operations md_fops = |
5155 | { | |
5156 | .owner = THIS_MODULE, | |
a39907fa AV |
5157 | .open = md_open, |
5158 | .release = md_release, | |
5159 | .locked_ioctl = md_ioctl, | |
a885c8c4 | 5160 | .getgeo = md_getgeo, |
44ce6294 LT |
5161 | .media_changed = md_media_changed, |
5162 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5163 | }; |
5164 | ||
75c96f85 | 5165 | static int md_thread(void * arg) |
1da177e4 LT |
5166 | { |
5167 | mdk_thread_t *thread = arg; | |
5168 | ||
1da177e4 LT |
5169 | /* |
5170 | * md_thread is a 'system-thread', it's priority should be very | |
5171 | * high. We avoid resource deadlocks individually in each | |
5172 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5173 | * the very same RT priority as kswapd, thus we will never get | |
5174 | * into a priority inversion deadlock. | |
5175 | * | |
5176 | * we definitely have to have equal or higher priority than | |
5177 | * bdflush, otherwise bdflush will deadlock if there are too | |
5178 | * many dirty RAID5 blocks. | |
5179 | */ | |
1da177e4 | 5180 | |
6985c43f | 5181 | allow_signal(SIGKILL); |
a6fb0934 | 5182 | while (!kthread_should_stop()) { |
1da177e4 | 5183 | |
93588e22 N |
5184 | /* We need to wait INTERRUPTIBLE so that |
5185 | * we don't add to the load-average. | |
5186 | * That means we need to be sure no signals are | |
5187 | * pending | |
5188 | */ | |
5189 | if (signal_pending(current)) | |
5190 | flush_signals(current); | |
5191 | ||
5192 | wait_event_interruptible_timeout | |
5193 | (thread->wqueue, | |
5194 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5195 | || kthread_should_stop(), | |
5196 | thread->timeout); | |
1da177e4 LT |
5197 | |
5198 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5199 | ||
787453c2 | 5200 | thread->run(thread->mddev); |
1da177e4 | 5201 | } |
a6fb0934 | 5202 | |
1da177e4 LT |
5203 | return 0; |
5204 | } | |
5205 | ||
5206 | void md_wakeup_thread(mdk_thread_t *thread) | |
5207 | { | |
5208 | if (thread) { | |
5209 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5210 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5211 | wake_up(&thread->wqueue); | |
5212 | } | |
5213 | } | |
5214 | ||
5215 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5216 | const char *name) | |
5217 | { | |
5218 | mdk_thread_t *thread; | |
1da177e4 | 5219 | |
9ffae0cf | 5220 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5221 | if (!thread) |
5222 | return NULL; | |
5223 | ||
1da177e4 LT |
5224 | init_waitqueue_head(&thread->wqueue); |
5225 | ||
1da177e4 LT |
5226 | thread->run = run; |
5227 | thread->mddev = mddev; | |
32a7627c | 5228 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5229 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5230 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5231 | kfree(thread); |
5232 | return NULL; | |
5233 | } | |
1da177e4 LT |
5234 | return thread; |
5235 | } | |
5236 | ||
1da177e4 LT |
5237 | void md_unregister_thread(mdk_thread_t *thread) |
5238 | { | |
ba25f9dc | 5239 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5240 | |
5241 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5242 | kfree(thread); |
5243 | } | |
5244 | ||
5245 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5246 | { | |
5247 | if (!mddev) { | |
5248 | MD_BUG(); | |
5249 | return; | |
5250 | } | |
5251 | ||
b2d444d7 | 5252 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5253 | return; |
6bfe0b49 DW |
5254 | |
5255 | if (mddev->external) | |
5256 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5257 | /* |
1da177e4 LT |
5258 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5259 | mdname(mddev), | |
5260 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5261 | __builtin_return_address(0),__builtin_return_address(1), | |
5262 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5263 | */ |
d0a0a5ee AM |
5264 | if (!mddev->pers) |
5265 | return; | |
1da177e4 LT |
5266 | if (!mddev->pers->error_handler) |
5267 | return; | |
5268 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5269 | if (mddev->degraded) |
5270 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5271 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5272 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5273 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5274 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5275 | md_new_event_inintr(mddev); |
1da177e4 LT |
5276 | } |
5277 | ||
5278 | /* seq_file implementation /proc/mdstat */ | |
5279 | ||
5280 | static void status_unused(struct seq_file *seq) | |
5281 | { | |
5282 | int i = 0; | |
5283 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5284 | |
5285 | seq_printf(seq, "unused devices: "); | |
5286 | ||
159ec1fc | 5287 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5288 | char b[BDEVNAME_SIZE]; |
5289 | i++; | |
5290 | seq_printf(seq, "%s ", | |
5291 | bdevname(rdev->bdev,b)); | |
5292 | } | |
5293 | if (!i) | |
5294 | seq_printf(seq, "<none>"); | |
5295 | ||
5296 | seq_printf(seq, "\n"); | |
5297 | } | |
5298 | ||
5299 | ||
5300 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5301 | { | |
4588b42e N |
5302 | sector_t max_blocks, resync, res; |
5303 | unsigned long dt, db, rt; | |
5304 | int scale; | |
5305 | unsigned int per_milli; | |
1da177e4 LT |
5306 | |
5307 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
5308 | ||
5309 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5310 | max_blocks = mddev->resync_max_sectors >> 1; | |
5311 | else | |
5312 | max_blocks = mddev->size; | |
5313 | ||
5314 | /* | |
5315 | * Should not happen. | |
5316 | */ | |
5317 | if (!max_blocks) { | |
5318 | MD_BUG(); | |
5319 | return; | |
5320 | } | |
4588b42e N |
5321 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
5322 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
5323 | * u32, as those are the requirements for sector_div. | |
5324 | * Thus 'scale' must be at least 10 | |
5325 | */ | |
5326 | scale = 10; | |
5327 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5328 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
5329 | scale++; | |
5330 | } | |
5331 | res = (resync>>scale)*1000; | |
5332 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
5333 | ||
5334 | per_milli = res; | |
1da177e4 | 5335 | { |
4588b42e | 5336 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5337 | seq_printf(seq, "["); |
5338 | for (i = 0; i < x; i++) | |
5339 | seq_printf(seq, "="); | |
5340 | seq_printf(seq, ">"); | |
5341 | for (i = 0; i < y; i++) | |
5342 | seq_printf(seq, "."); | |
5343 | seq_printf(seq, "] "); | |
5344 | } | |
4588b42e | 5345 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5346 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5347 | "reshape" : | |
61df9d91 N |
5348 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5349 | "check" : | |
5350 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5351 | "resync" : "recovery"))), | |
5352 | per_milli/10, per_milli % 10, | |
4588b42e N |
5353 | (unsigned long long) resync, |
5354 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5355 | |
5356 | /* | |
5357 | * We do not want to overflow, so the order of operands and | |
5358 | * the * 100 / 100 trick are important. We do a +1 to be | |
5359 | * safe against division by zero. We only estimate anyway. | |
5360 | * | |
5361 | * dt: time from mark until now | |
5362 | * db: blocks written from mark until now | |
5363 | * rt: remaining time | |
5364 | */ | |
5365 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5366 | if (!dt) dt++; | |
ff4e8d9a N |
5367 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5368 | - mddev->resync_mark_cnt; | |
5369 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5370 | |
5371 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5372 | ||
ff4e8d9a | 5373 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5374 | } |
5375 | ||
5376 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5377 | { | |
5378 | struct list_head *tmp; | |
5379 | loff_t l = *pos; | |
5380 | mddev_t *mddev; | |
5381 | ||
5382 | if (l >= 0x10000) | |
5383 | return NULL; | |
5384 | if (!l--) | |
5385 | /* header */ | |
5386 | return (void*)1; | |
5387 | ||
5388 | spin_lock(&all_mddevs_lock); | |
5389 | list_for_each(tmp,&all_mddevs) | |
5390 | if (!l--) { | |
5391 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5392 | mddev_get(mddev); | |
5393 | spin_unlock(&all_mddevs_lock); | |
5394 | return mddev; | |
5395 | } | |
5396 | spin_unlock(&all_mddevs_lock); | |
5397 | if (!l--) | |
5398 | return (void*)2;/* tail */ | |
5399 | return NULL; | |
5400 | } | |
5401 | ||
5402 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5403 | { | |
5404 | struct list_head *tmp; | |
5405 | mddev_t *next_mddev, *mddev = v; | |
5406 | ||
5407 | ++*pos; | |
5408 | if (v == (void*)2) | |
5409 | return NULL; | |
5410 | ||
5411 | spin_lock(&all_mddevs_lock); | |
5412 | if (v == (void*)1) | |
5413 | tmp = all_mddevs.next; | |
5414 | else | |
5415 | tmp = mddev->all_mddevs.next; | |
5416 | if (tmp != &all_mddevs) | |
5417 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5418 | else { | |
5419 | next_mddev = (void*)2; | |
5420 | *pos = 0x10000; | |
5421 | } | |
5422 | spin_unlock(&all_mddevs_lock); | |
5423 | ||
5424 | if (v != (void*)1) | |
5425 | mddev_put(mddev); | |
5426 | return next_mddev; | |
5427 | ||
5428 | } | |
5429 | ||
5430 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5431 | { | |
5432 | mddev_t *mddev = v; | |
5433 | ||
5434 | if (mddev && v != (void*)1 && v != (void*)2) | |
5435 | mddev_put(mddev); | |
5436 | } | |
5437 | ||
d7603b7e N |
5438 | struct mdstat_info { |
5439 | int event; | |
5440 | }; | |
5441 | ||
1da177e4 LT |
5442 | static int md_seq_show(struct seq_file *seq, void *v) |
5443 | { | |
5444 | mddev_t *mddev = v; | |
5445 | sector_t size; | |
1da177e4 | 5446 | mdk_rdev_t *rdev; |
d7603b7e | 5447 | struct mdstat_info *mi = seq->private; |
32a7627c | 5448 | struct bitmap *bitmap; |
1da177e4 LT |
5449 | |
5450 | if (v == (void*)1) { | |
2604b703 | 5451 | struct mdk_personality *pers; |
1da177e4 LT |
5452 | seq_printf(seq, "Personalities : "); |
5453 | spin_lock(&pers_lock); | |
2604b703 N |
5454 | list_for_each_entry(pers, &pers_list, list) |
5455 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5456 | |
5457 | spin_unlock(&pers_lock); | |
5458 | seq_printf(seq, "\n"); | |
d7603b7e | 5459 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5460 | return 0; |
5461 | } | |
5462 | if (v == (void*)2) { | |
5463 | status_unused(seq); | |
5464 | return 0; | |
5465 | } | |
5466 | ||
5dc5cf7d | 5467 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5468 | return -EINTR; |
5dc5cf7d | 5469 | |
1da177e4 LT |
5470 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5471 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5472 | mddev->pers ? "" : "in"); | |
5473 | if (mddev->pers) { | |
f91de92e | 5474 | if (mddev->ro==1) |
1da177e4 | 5475 | seq_printf(seq, " (read-only)"); |
f91de92e | 5476 | if (mddev->ro==2) |
52720ae7 | 5477 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5478 | seq_printf(seq, " %s", mddev->pers->name); |
5479 | } | |
5480 | ||
5481 | size = 0; | |
159ec1fc | 5482 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5483 | char b[BDEVNAME_SIZE]; |
5484 | seq_printf(seq, " %s[%d]", | |
5485 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5486 | if (test_bit(WriteMostly, &rdev->flags)) |
5487 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5488 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5489 | seq_printf(seq, "(F)"); |
5490 | continue; | |
b325a32e N |
5491 | } else if (rdev->raid_disk < 0) |
5492 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
5493 | size += rdev->size; |
5494 | } | |
5495 | ||
5496 | if (!list_empty(&mddev->disks)) { | |
5497 | if (mddev->pers) | |
5498 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
5499 | (unsigned long long) |
5500 | mddev->array_sectors / 2); | |
1da177e4 LT |
5501 | else |
5502 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c | 5503 | (unsigned long long)size); |
1da177e4 | 5504 | } |
1cd6bf19 N |
5505 | if (mddev->persistent) { |
5506 | if (mddev->major_version != 0 || | |
5507 | mddev->minor_version != 90) { | |
5508 | seq_printf(seq," super %d.%d", | |
5509 | mddev->major_version, | |
5510 | mddev->minor_version); | |
5511 | } | |
e691063a N |
5512 | } else if (mddev->external) |
5513 | seq_printf(seq, " super external:%s", | |
5514 | mddev->metadata_type); | |
5515 | else | |
1cd6bf19 | 5516 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5517 | |
5518 | if (mddev->pers) { | |
d710e138 | 5519 | mddev->pers->status(seq, mddev); |
1da177e4 | 5520 | seq_printf(seq, "\n "); |
8e1b39d6 N |
5521 | if (mddev->pers->sync_request) { |
5522 | if (mddev->curr_resync > 2) { | |
d710e138 | 5523 | status_resync(seq, mddev); |
8e1b39d6 N |
5524 | seq_printf(seq, "\n "); |
5525 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5526 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5527 | else if (mddev->recovery_cp < MaxSector) | |
5528 | seq_printf(seq, "\tresync=PENDING\n "); | |
5529 | } | |
32a7627c N |
5530 | } else |
5531 | seq_printf(seq, "\n "); | |
5532 | ||
5533 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5534 | unsigned long chunk_kb; |
5535 | unsigned long flags; | |
32a7627c N |
5536 | spin_lock_irqsave(&bitmap->lock, flags); |
5537 | chunk_kb = bitmap->chunksize >> 10; | |
5538 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5539 | "%lu%s chunk", | |
5540 | bitmap->pages - bitmap->missing_pages, | |
5541 | bitmap->pages, | |
5542 | (bitmap->pages - bitmap->missing_pages) | |
5543 | << (PAGE_SHIFT - 10), | |
5544 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5545 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5546 | if (bitmap->file) { |
5547 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5548 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5549 | } |
78d742d8 | 5550 | |
32a7627c N |
5551 | seq_printf(seq, "\n"); |
5552 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5553 | } |
5554 | ||
5555 | seq_printf(seq, "\n"); | |
5556 | } | |
5557 | mddev_unlock(mddev); | |
5558 | ||
5559 | return 0; | |
5560 | } | |
5561 | ||
5562 | static struct seq_operations md_seq_ops = { | |
5563 | .start = md_seq_start, | |
5564 | .next = md_seq_next, | |
5565 | .stop = md_seq_stop, | |
5566 | .show = md_seq_show, | |
5567 | }; | |
5568 | ||
5569 | static int md_seq_open(struct inode *inode, struct file *file) | |
5570 | { | |
5571 | int error; | |
d7603b7e N |
5572 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5573 | if (mi == NULL) | |
5574 | return -ENOMEM; | |
1da177e4 LT |
5575 | |
5576 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5577 | if (error) |
5578 | kfree(mi); | |
5579 | else { | |
5580 | struct seq_file *p = file->private_data; | |
5581 | p->private = mi; | |
5582 | mi->event = atomic_read(&md_event_count); | |
5583 | } | |
1da177e4 LT |
5584 | return error; |
5585 | } | |
5586 | ||
d7603b7e N |
5587 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5588 | { | |
5589 | struct seq_file *m = filp->private_data; | |
5590 | struct mdstat_info *mi = m->private; | |
5591 | int mask; | |
5592 | ||
5593 | poll_wait(filp, &md_event_waiters, wait); | |
5594 | ||
5595 | /* always allow read */ | |
5596 | mask = POLLIN | POLLRDNORM; | |
5597 | ||
5598 | if (mi->event != atomic_read(&md_event_count)) | |
5599 | mask |= POLLERR | POLLPRI; | |
5600 | return mask; | |
5601 | } | |
5602 | ||
fa027c2a | 5603 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5604 | .owner = THIS_MODULE, |
1da177e4 LT |
5605 | .open = md_seq_open, |
5606 | .read = seq_read, | |
5607 | .llseek = seq_lseek, | |
c3f94b40 | 5608 | .release = seq_release_private, |
d7603b7e | 5609 | .poll = mdstat_poll, |
1da177e4 LT |
5610 | }; |
5611 | ||
2604b703 | 5612 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5613 | { |
1da177e4 | 5614 | spin_lock(&pers_lock); |
2604b703 N |
5615 | list_add_tail(&p->list, &pers_list); |
5616 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5617 | spin_unlock(&pers_lock); |
5618 | return 0; | |
5619 | } | |
5620 | ||
2604b703 | 5621 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5622 | { |
2604b703 | 5623 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5624 | spin_lock(&pers_lock); |
2604b703 | 5625 | list_del_init(&p->list); |
1da177e4 LT |
5626 | spin_unlock(&pers_lock); |
5627 | return 0; | |
5628 | } | |
5629 | ||
5630 | static int is_mddev_idle(mddev_t *mddev) | |
5631 | { | |
5632 | mdk_rdev_t * rdev; | |
1da177e4 | 5633 | int idle; |
713f6ab1 | 5634 | long curr_events; |
1da177e4 LT |
5635 | |
5636 | idle = 1; | |
4b80991c N |
5637 | rcu_read_lock(); |
5638 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5639 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
074a7aca TH |
5640 | curr_events = part_stat_read(&disk->part0, sectors[0]) + |
5641 | part_stat_read(&disk->part0, sectors[1]) - | |
1da177e4 | 5642 | atomic_read(&disk->sync_io); |
713f6ab1 N |
5643 | /* sync IO will cause sync_io to increase before the disk_stats |
5644 | * as sync_io is counted when a request starts, and | |
5645 | * disk_stats is counted when it completes. | |
5646 | * So resync activity will cause curr_events to be smaller than | |
5647 | * when there was no such activity. | |
5648 | * non-sync IO will cause disk_stat to increase without | |
5649 | * increasing sync_io so curr_events will (eventually) | |
5650 | * be larger than it was before. Once it becomes | |
5651 | * substantially larger, the test below will cause | |
5652 | * the array to appear non-idle, and resync will slow | |
5653 | * down. | |
5654 | * If there is a lot of outstanding resync activity when | |
5655 | * we set last_event to curr_events, then all that activity | |
5656 | * completing might cause the array to appear non-idle | |
5657 | * and resync will be slowed down even though there might | |
5658 | * not have been non-resync activity. This will only | |
5659 | * happen once though. 'last_events' will soon reflect | |
5660 | * the state where there is little or no outstanding | |
5661 | * resync requests, and further resync activity will | |
5662 | * always make curr_events less than last_events. | |
c0e48521 | 5663 | * |
1da177e4 | 5664 | */ |
713f6ab1 | 5665 | if (curr_events - rdev->last_events > 4096) { |
1da177e4 LT |
5666 | rdev->last_events = curr_events; |
5667 | idle = 0; | |
5668 | } | |
5669 | } | |
4b80991c | 5670 | rcu_read_unlock(); |
1da177e4 LT |
5671 | return idle; |
5672 | } | |
5673 | ||
5674 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5675 | { | |
5676 | /* another "blocks" (512byte) blocks have been synced */ | |
5677 | atomic_sub(blocks, &mddev->recovery_active); | |
5678 | wake_up(&mddev->recovery_wait); | |
5679 | if (!ok) { | |
dfc70645 | 5680 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5681 | md_wakeup_thread(mddev->thread); |
5682 | // stop recovery, signal do_sync .... | |
5683 | } | |
5684 | } | |
5685 | ||
5686 | ||
06d91a5f N |
5687 | /* md_write_start(mddev, bi) |
5688 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5689 | * in superblock) before writing, schedule a superblock update |
5690 | * and wait for it to complete. | |
06d91a5f | 5691 | */ |
3d310eb7 | 5692 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5693 | { |
0fd62b86 | 5694 | int did_change = 0; |
06d91a5f | 5695 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5696 | return; |
06d91a5f | 5697 | |
f91de92e N |
5698 | BUG_ON(mddev->ro == 1); |
5699 | if (mddev->ro == 2) { | |
5700 | /* need to switch to read/write */ | |
5701 | mddev->ro = 0; | |
5702 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5703 | md_wakeup_thread(mddev->thread); | |
25156198 | 5704 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 5705 | did_change = 1; |
f91de92e | 5706 | } |
06d91a5f | 5707 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
5708 | if (mddev->safemode == 1) |
5709 | mddev->safemode = 0; | |
06d91a5f | 5710 | if (mddev->in_sync) { |
a9701a30 | 5711 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5712 | if (mddev->in_sync) { |
5713 | mddev->in_sync = 0; | |
850b2b42 | 5714 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 5715 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 5716 | did_change = 1; |
3d310eb7 | 5717 | } |
a9701a30 | 5718 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5719 | } |
0fd62b86 | 5720 | if (did_change) |
b62b7590 | 5721 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
5722 | wait_event(mddev->sb_wait, |
5723 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
5724 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
5725 | } |
5726 | ||
5727 | void md_write_end(mddev_t *mddev) | |
5728 | { | |
5729 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5730 | if (mddev->safemode == 2) | |
5731 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5732 | else if (mddev->safemode_delay) |
1da177e4 LT |
5733 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5734 | } | |
5735 | } | |
5736 | ||
2a2275d6 N |
5737 | /* md_allow_write(mddev) |
5738 | * Calling this ensures that the array is marked 'active' so that writes | |
5739 | * may proceed without blocking. It is important to call this before | |
5740 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5741 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
5742 | * |
5743 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
5744 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 5745 | */ |
b5470dc5 | 5746 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
5747 | { |
5748 | if (!mddev->pers) | |
b5470dc5 | 5749 | return 0; |
2a2275d6 | 5750 | if (mddev->ro) |
b5470dc5 | 5751 | return 0; |
1a0fd497 | 5752 | if (!mddev->pers->sync_request) |
b5470dc5 | 5753 | return 0; |
2a2275d6 N |
5754 | |
5755 | spin_lock_irq(&mddev->write_lock); | |
5756 | if (mddev->in_sync) { | |
5757 | mddev->in_sync = 0; | |
5758 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5759 | if (mddev->safemode_delay && | |
5760 | mddev->safemode == 0) | |
5761 | mddev->safemode = 1; | |
5762 | spin_unlock_irq(&mddev->write_lock); | |
5763 | md_update_sb(mddev, 0); | |
b62b7590 | 5764 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
5765 | } else |
5766 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
5767 | |
5768 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
5769 | return -EAGAIN; | |
5770 | else | |
5771 | return 0; | |
2a2275d6 N |
5772 | } |
5773 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5774 | ||
1da177e4 LT |
5775 | #define SYNC_MARKS 10 |
5776 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5777 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5778 | { |
5779 | mddev_t *mddev2; | |
5780 | unsigned int currspeed = 0, | |
5781 | window; | |
57afd89f | 5782 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5783 | unsigned long mark[SYNC_MARKS]; |
5784 | sector_t mark_cnt[SYNC_MARKS]; | |
5785 | int last_mark,m; | |
5786 | struct list_head *tmp; | |
5787 | sector_t last_check; | |
57afd89f | 5788 | int skipped = 0; |
5fd6c1dc | 5789 | mdk_rdev_t *rdev; |
61df9d91 | 5790 | char *desc; |
1da177e4 LT |
5791 | |
5792 | /* just incase thread restarts... */ | |
5793 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5794 | return; | |
5fd6c1dc N |
5795 | if (mddev->ro) /* never try to sync a read-only array */ |
5796 | return; | |
1da177e4 | 5797 | |
61df9d91 N |
5798 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5799 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5800 | desc = "data-check"; | |
5801 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5802 | desc = "requested-resync"; | |
5803 | else | |
5804 | desc = "resync"; | |
5805 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5806 | desc = "reshape"; | |
5807 | else | |
5808 | desc = "recovery"; | |
5809 | ||
1da177e4 LT |
5810 | /* we overload curr_resync somewhat here. |
5811 | * 0 == not engaged in resync at all | |
5812 | * 2 == checking that there is no conflict with another sync | |
5813 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5814 | * commense | |
5815 | * other == active in resync - this many blocks | |
5816 | * | |
5817 | * Before starting a resync we must have set curr_resync to | |
5818 | * 2, and then checked that every "conflicting" array has curr_resync | |
5819 | * less than ours. When we find one that is the same or higher | |
5820 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5821 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5822 | * This will mean we have to start checking from the beginning again. | |
5823 | * | |
5824 | */ | |
5825 | ||
5826 | do { | |
5827 | mddev->curr_resync = 2; | |
5828 | ||
5829 | try_again: | |
787453c2 | 5830 | if (kthread_should_stop()) { |
6985c43f | 5831 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5832 | goto skip; |
5833 | } | |
29ac4aa3 | 5834 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
5835 | if (mddev2 == mddev) |
5836 | continue; | |
90b08710 BS |
5837 | if (!mddev->parallel_resync |
5838 | && mddev2->curr_resync | |
5839 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
5840 | DEFINE_WAIT(wq); |
5841 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5842 | /* arbitrarily yield */ | |
5843 | mddev->curr_resync = 1; | |
5844 | wake_up(&resync_wait); | |
5845 | } | |
5846 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5847 | /* no need to wait here, we can wait the next | |
5848 | * time 'round when curr_resync == 2 | |
5849 | */ | |
5850 | continue; | |
9744197c N |
5851 | /* We need to wait 'interruptible' so as not to |
5852 | * contribute to the load average, and not to | |
5853 | * be caught by 'softlockup' | |
5854 | */ | |
5855 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 5856 | if (!kthread_should_stop() && |
8712e553 | 5857 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
5858 | printk(KERN_INFO "md: delaying %s of %s" |
5859 | " until %s has finished (they" | |
1da177e4 | 5860 | " share one or more physical units)\n", |
61df9d91 | 5861 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 5862 | mddev_put(mddev2); |
9744197c N |
5863 | if (signal_pending(current)) |
5864 | flush_signals(current); | |
1da177e4 LT |
5865 | schedule(); |
5866 | finish_wait(&resync_wait, &wq); | |
5867 | goto try_again; | |
5868 | } | |
5869 | finish_wait(&resync_wait, &wq); | |
5870 | } | |
5871 | } | |
5872 | } while (mddev->curr_resync < 2); | |
5873 | ||
5fd6c1dc | 5874 | j = 0; |
9d88883e | 5875 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 5876 | /* resync follows the size requested by the personality, |
57afd89f | 5877 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
5878 | */ |
5879 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 5880 | mddev->resync_mismatches = 0; |
5fd6c1dc | 5881 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
5882 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
5883 | j = mddev->resync_min; | |
5884 | else if (!mddev->bitmap) | |
5fd6c1dc | 5885 | j = mddev->recovery_cp; |
5e96ee65 | 5886 | |
ccfcc3c1 N |
5887 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
5888 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5889 | else { |
1da177e4 LT |
5890 | /* recovery follows the physical size of devices */ |
5891 | max_sectors = mddev->size << 1; | |
5fd6c1dc | 5892 | j = MaxSector; |
159ec1fc | 5893 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
5894 | if (rdev->raid_disk >= 0 && |
5895 | !test_bit(Faulty, &rdev->flags) && | |
5896 | !test_bit(In_sync, &rdev->flags) && | |
5897 | rdev->recovery_offset < j) | |
5898 | j = rdev->recovery_offset; | |
5899 | } | |
1da177e4 | 5900 | |
61df9d91 N |
5901 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
5902 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
5903 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 5904 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
5905 | "(but not more than %d KB/sec) for %s.\n", |
5906 | speed_max(mddev), desc); | |
1da177e4 LT |
5907 | |
5908 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
5fd6c1dc | 5909 | |
57afd89f | 5910 | io_sectors = 0; |
1da177e4 LT |
5911 | for (m = 0; m < SYNC_MARKS; m++) { |
5912 | mark[m] = jiffies; | |
57afd89f | 5913 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
5914 | } |
5915 | last_mark = 0; | |
5916 | mddev->resync_mark = mark[last_mark]; | |
5917 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
5918 | ||
5919 | /* | |
5920 | * Tune reconstruction: | |
5921 | */ | |
5922 | window = 32*(PAGE_SIZE/512); | |
5923 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
5924 | window/2,(unsigned long long) max_sectors/2); | |
5925 | ||
5926 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
5927 | last_check = 0; |
5928 | ||
5929 | if (j>2) { | |
5930 | printk(KERN_INFO | |
61df9d91 N |
5931 | "md: resuming %s of %s from checkpoint.\n", |
5932 | desc, mdname(mddev)); | |
1da177e4 LT |
5933 | mddev->curr_resync = j; |
5934 | } | |
5935 | ||
5936 | while (j < max_sectors) { | |
57afd89f | 5937 | sector_t sectors; |
1da177e4 | 5938 | |
57afd89f | 5939 | skipped = 0; |
c6207277 N |
5940 | if (j >= mddev->resync_max) { |
5941 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
5942 | wait_event(mddev->recovery_wait, | |
5943 | mddev->resync_max > j | |
5944 | || kthread_should_stop()); | |
5945 | } | |
5946 | if (kthread_should_stop()) | |
5947 | goto interrupted; | |
57afd89f | 5948 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 5949 | currspeed < speed_min(mddev)); |
57afd89f | 5950 | if (sectors == 0) { |
dfc70645 | 5951 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5952 | goto out; |
5953 | } | |
57afd89f N |
5954 | |
5955 | if (!skipped) { /* actual IO requested */ | |
5956 | io_sectors += sectors; | |
5957 | atomic_add(sectors, &mddev->recovery_active); | |
5958 | } | |
5959 | ||
1da177e4 LT |
5960 | j += sectors; |
5961 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 5962 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
5963 | if (last_check == 0) |
5964 | /* this is the earliers that rebuilt will be | |
5965 | * visible in /proc/mdstat | |
5966 | */ | |
5967 | md_new_event(mddev); | |
57afd89f N |
5968 | |
5969 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
5970 | continue; |
5971 | ||
57afd89f | 5972 | last_check = io_sectors; |
1da177e4 | 5973 | |
dfc70645 | 5974 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
5975 | break; |
5976 | ||
5977 | repeat: | |
5978 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
5979 | /* step marks */ | |
5980 | int next = (last_mark+1) % SYNC_MARKS; | |
5981 | ||
5982 | mddev->resync_mark = mark[next]; | |
5983 | mddev->resync_mark_cnt = mark_cnt[next]; | |
5984 | mark[next] = jiffies; | |
57afd89f | 5985 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5986 | last_mark = next; |
5987 | } | |
5988 | ||
5989 | ||
c6207277 N |
5990 | if (kthread_should_stop()) |
5991 | goto interrupted; | |
5992 | ||
1da177e4 LT |
5993 | |
5994 | /* | |
5995 | * this loop exits only if either when we are slower than | |
5996 | * the 'hard' speed limit, or the system was IO-idle for | |
5997 | * a jiffy. | |
5998 | * the system might be non-idle CPU-wise, but we only care | |
5999 | * about not overloading the IO subsystem. (things like an | |
6000 | * e2fsck being done on the RAID array should execute fast) | |
6001 | */ | |
2ad8b1ef | 6002 | blk_unplug(mddev->queue); |
1da177e4 LT |
6003 | cond_resched(); |
6004 | ||
57afd89f N |
6005 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6006 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6007 | |
88202a0c N |
6008 | if (currspeed > speed_min(mddev)) { |
6009 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 6010 | !is_mddev_idle(mddev)) { |
c0e48521 | 6011 | msleep(500); |
1da177e4 LT |
6012 | goto repeat; |
6013 | } | |
6014 | } | |
6015 | } | |
61df9d91 | 6016 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6017 | /* |
6018 | * this also signals 'finished resyncing' to md_stop | |
6019 | */ | |
6020 | out: | |
2ad8b1ef | 6021 | blk_unplug(mddev->queue); |
1da177e4 LT |
6022 | |
6023 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6024 | ||
6025 | /* tell personality that we are finished */ | |
57afd89f | 6026 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6027 | |
dfc70645 | 6028 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6029 | mddev->curr_resync > 2) { |
6030 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6031 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6032 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6033 | printk(KERN_INFO | |
61df9d91 N |
6034 | "md: checkpointing %s of %s.\n", |
6035 | desc, mdname(mddev)); | |
5fd6c1dc N |
6036 | mddev->recovery_cp = mddev->curr_resync; |
6037 | } | |
6038 | } else | |
6039 | mddev->recovery_cp = MaxSector; | |
6040 | } else { | |
6041 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6042 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6043 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6044 | if (rdev->raid_disk >= 0 && |
6045 | !test_bit(Faulty, &rdev->flags) && | |
6046 | !test_bit(In_sync, &rdev->flags) && | |
6047 | rdev->recovery_offset < mddev->curr_resync) | |
6048 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6049 | } |
1da177e4 | 6050 | } |
17571284 | 6051 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6052 | |
1da177e4 LT |
6053 | skip: |
6054 | mddev->curr_resync = 0; | |
5e96ee65 | 6055 | mddev->resync_min = 0; |
c6207277 N |
6056 | mddev->resync_max = MaxSector; |
6057 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
6058 | wake_up(&resync_wait); |
6059 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6060 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6061 | return; |
6062 | ||
6063 | interrupted: | |
6064 | /* | |
6065 | * got a signal, exit. | |
6066 | */ | |
6067 | printk(KERN_INFO | |
6068 | "md: md_do_sync() got signal ... exiting\n"); | |
6069 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6070 | goto out; | |
6071 | ||
1da177e4 | 6072 | } |
29269553 | 6073 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6074 | |
6075 | ||
b4c4c7b8 N |
6076 | static int remove_and_add_spares(mddev_t *mddev) |
6077 | { | |
6078 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6079 | int spares = 0; |
6080 | ||
159ec1fc | 6081 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6082 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6083 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6084 | (test_bit(Faulty, &rdev->flags) || |
6085 | ! test_bit(In_sync, &rdev->flags)) && | |
6086 | atomic_read(&rdev->nr_pending)==0) { | |
6087 | if (mddev->pers->hot_remove_disk( | |
6088 | mddev, rdev->raid_disk)==0) { | |
6089 | char nm[20]; | |
6090 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6091 | sysfs_remove_link(&mddev->kobj, nm); | |
6092 | rdev->raid_disk = -1; | |
6093 | } | |
6094 | } | |
6095 | ||
c89a8eee | 6096 | if (mddev->degraded && ! mddev->ro) { |
159ec1fc | 6097 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6098 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6099 | !test_bit(In_sync, &rdev->flags) && |
6100 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6101 | spares++; |
b4c4c7b8 N |
6102 | if (rdev->raid_disk < 0 |
6103 | && !test_bit(Faulty, &rdev->flags)) { | |
6104 | rdev->recovery_offset = 0; | |
199050ea NB |
6105 | if (mddev->pers-> |
6106 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6107 | char nm[20]; |
6108 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6109 | if (sysfs_create_link(&mddev->kobj, |
6110 | &rdev->kobj, nm)) | |
6111 | printk(KERN_WARNING | |
6112 | "md: cannot register " | |
6113 | "%s for %s\n", | |
6114 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6115 | spares++; |
6116 | md_new_event(mddev); | |
6117 | } else | |
6118 | break; | |
6119 | } | |
dfc70645 | 6120 | } |
b4c4c7b8 N |
6121 | } |
6122 | return spares; | |
6123 | } | |
1da177e4 LT |
6124 | /* |
6125 | * This routine is regularly called by all per-raid-array threads to | |
6126 | * deal with generic issues like resync and super-block update. | |
6127 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6128 | * need this as they never do any recovery or update the superblock. | |
6129 | * | |
6130 | * It does not do any resync itself, but rather "forks" off other threads | |
6131 | * to do that as needed. | |
6132 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6133 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6134 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6135 | * and wakeups up this thread which will reap the thread and finish up. |
6136 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6137 | * | |
6138 | * The overall approach is: | |
6139 | * 1/ if the superblock needs updating, update it. | |
6140 | * 2/ If a recovery thread is running, don't do anything else. | |
6141 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6142 | * 4/ If there are any faulty devices, remove them. | |
6143 | * 5/ If array is degraded, try to add spares devices | |
6144 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6145 | */ | |
6146 | void md_check_recovery(mddev_t *mddev) | |
6147 | { | |
6148 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6149 | |
6150 | ||
5f40402d N |
6151 | if (mddev->bitmap) |
6152 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
6153 | |
6154 | if (mddev->ro) | |
6155 | return; | |
fca4d848 N |
6156 | |
6157 | if (signal_pending(current)) { | |
31a59e34 | 6158 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6159 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6160 | mdname(mddev)); | |
6161 | mddev->safemode = 2; | |
6162 | } | |
6163 | flush_signals(current); | |
6164 | } | |
6165 | ||
c89a8eee N |
6166 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6167 | return; | |
1da177e4 | 6168 | if ( ! ( |
e691063a | 6169 | (mddev->flags && !mddev->external) || |
1da177e4 | 6170 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6171 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6172 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6173 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6174 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6175 | )) |
6176 | return; | |
fca4d848 | 6177 | |
df5b89b3 | 6178 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6179 | int spares = 0; |
fca4d848 | 6180 | |
c89a8eee N |
6181 | if (mddev->ro) { |
6182 | /* Only thing we do on a ro array is remove | |
6183 | * failed devices. | |
6184 | */ | |
6185 | remove_and_add_spares(mddev); | |
6186 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6187 | goto unlock; | |
6188 | } | |
6189 | ||
31a59e34 | 6190 | if (!mddev->external) { |
0fd62b86 | 6191 | int did_change = 0; |
31a59e34 N |
6192 | spin_lock_irq(&mddev->write_lock); |
6193 | if (mddev->safemode && | |
6194 | !atomic_read(&mddev->writes_pending) && | |
6195 | !mddev->in_sync && | |
6196 | mddev->recovery_cp == MaxSector) { | |
6197 | mddev->in_sync = 1; | |
0fd62b86 | 6198 | did_change = 1; |
31a59e34 N |
6199 | if (mddev->persistent) |
6200 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6201 | } | |
6202 | if (mddev->safemode == 1) | |
6203 | mddev->safemode = 0; | |
6204 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6205 | if (did_change) |
b62b7590 | 6206 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6207 | } |
fca4d848 | 6208 | |
850b2b42 N |
6209 | if (mddev->flags) |
6210 | md_update_sb(mddev, 0); | |
06d91a5f | 6211 | |
159ec1fc | 6212 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6213 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6214 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6215 | |
06d91a5f | 6216 | |
1da177e4 LT |
6217 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6218 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6219 | /* resync/recovery still happening */ | |
6220 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6221 | goto unlock; | |
6222 | } | |
6223 | if (mddev->sync_thread) { | |
6224 | /* resync has finished, collect result */ | |
6225 | md_unregister_thread(mddev->sync_thread); | |
6226 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6227 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6228 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6229 | /* success...*/ |
6230 | /* activate any spares */ | |
a99ac971 NB |
6231 | if (mddev->pers->spare_active(mddev)) |
6232 | sysfs_notify(&mddev->kobj, NULL, | |
6233 | "degraded"); | |
1da177e4 | 6234 | } |
850b2b42 | 6235 | md_update_sb(mddev, 1); |
41158c7e N |
6236 | |
6237 | /* if array is no-longer degraded, then any saved_raid_disk | |
6238 | * information must be scrapped | |
6239 | */ | |
6240 | if (!mddev->degraded) | |
159ec1fc | 6241 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6242 | rdev->saved_raid_disk = -1; |
6243 | ||
1da177e4 LT |
6244 | mddev->recovery = 0; |
6245 | /* flag recovery needed just to double check */ | |
6246 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6247 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6248 | md_new_event(mddev); |
1da177e4 LT |
6249 | goto unlock; |
6250 | } | |
72a23c21 NB |
6251 | /* Set RUNNING before clearing NEEDED to avoid |
6252 | * any transients in the value of "sync_action". | |
6253 | */ | |
6254 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6255 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6256 | /* Clear some bits that don't mean anything, but |
6257 | * might be left set | |
6258 | */ | |
24dd469d N |
6259 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6260 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6261 | |
5fd6c1dc N |
6262 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6263 | goto unlock; | |
1da177e4 LT |
6264 | /* no recovery is running. |
6265 | * remove any failed drives, then | |
6266 | * add spares if possible. | |
6267 | * Spare are also removed and re-added, to allow | |
6268 | * the personality to fail the re-add. | |
6269 | */ | |
1da177e4 | 6270 | |
b4c4c7b8 N |
6271 | if (mddev->reshape_position != MaxSector) { |
6272 | if (mddev->pers->check_reshape(mddev) != 0) | |
6273 | /* Cannot proceed */ | |
6274 | goto unlock; | |
6275 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6276 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6277 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6278 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6279 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6280 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6281 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6282 | } else if (mddev->recovery_cp < MaxSector) { |
6283 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6284 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6285 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6286 | /* nothing to be done ... */ | |
1da177e4 | 6287 | goto unlock; |
24dd469d | 6288 | |
1da177e4 | 6289 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6290 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6291 | /* We are adding a device or devices to an array | |
6292 | * which has the bitmap stored on all devices. | |
6293 | * So make sure all bitmap pages get written | |
6294 | */ | |
6295 | bitmap_write_all(mddev->bitmap); | |
6296 | } | |
1da177e4 LT |
6297 | mddev->sync_thread = md_register_thread(md_do_sync, |
6298 | mddev, | |
6299 | "%s_resync"); | |
6300 | if (!mddev->sync_thread) { | |
6301 | printk(KERN_ERR "%s: could not start resync" | |
6302 | " thread...\n", | |
6303 | mdname(mddev)); | |
6304 | /* leave the spares where they are, it shouldn't hurt */ | |
6305 | mddev->recovery = 0; | |
d7603b7e | 6306 | } else |
1da177e4 | 6307 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6308 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6309 | md_new_event(mddev); |
1da177e4 LT |
6310 | } |
6311 | unlock: | |
72a23c21 NB |
6312 | if (!mddev->sync_thread) { |
6313 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6314 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6315 | &mddev->recovery)) | |
0c3573f1 N |
6316 | if (mddev->sysfs_action) |
6317 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6318 | } |
1da177e4 LT |
6319 | mddev_unlock(mddev); |
6320 | } | |
6321 | } | |
6322 | ||
6bfe0b49 DW |
6323 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6324 | { | |
3c0ee63a | 6325 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
6326 | wait_event_timeout(rdev->blocked_wait, |
6327 | !test_bit(Blocked, &rdev->flags), | |
6328 | msecs_to_jiffies(5000)); | |
6329 | rdev_dec_pending(rdev, mddev); | |
6330 | } | |
6331 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6332 | ||
75c96f85 AB |
6333 | static int md_notify_reboot(struct notifier_block *this, |
6334 | unsigned long code, void *x) | |
1da177e4 LT |
6335 | { |
6336 | struct list_head *tmp; | |
6337 | mddev_t *mddev; | |
6338 | ||
6339 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6340 | ||
6341 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6342 | ||
29ac4aa3 | 6343 | for_each_mddev(mddev, tmp) |
c71d4887 | 6344 | if (mddev_trylock(mddev)) { |
2b25000b N |
6345 | /* Force a switch to readonly even array |
6346 | * appears to still be in use. Hence | |
6347 | * the '100'. | |
6348 | */ | |
d710e138 | 6349 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
6350 | mddev_unlock(mddev); |
6351 | } | |
1da177e4 LT |
6352 | /* |
6353 | * certain more exotic SCSI devices are known to be | |
6354 | * volatile wrt too early system reboots. While the | |
6355 | * right place to handle this issue is the given | |
6356 | * driver, we do want to have a safe RAID driver ... | |
6357 | */ | |
6358 | mdelay(1000*1); | |
6359 | } | |
6360 | return NOTIFY_DONE; | |
6361 | } | |
6362 | ||
75c96f85 | 6363 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6364 | .notifier_call = md_notify_reboot, |
6365 | .next = NULL, | |
6366 | .priority = INT_MAX, /* before any real devices */ | |
6367 | }; | |
6368 | ||
6369 | static void md_geninit(void) | |
6370 | { | |
1da177e4 LT |
6371 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6372 | ||
c7705f34 | 6373 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6374 | } |
6375 | ||
75c96f85 | 6376 | static int __init md_init(void) |
1da177e4 | 6377 | { |
1da177e4 LT |
6378 | if (register_blkdev(MAJOR_NR, "md")) |
6379 | return -1; | |
6380 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
6381 | unregister_blkdev(MAJOR_NR, "md"); | |
6382 | return -1; | |
6383 | } | |
e8703fe1 N |
6384 | blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE, |
6385 | md_probe, NULL, NULL); | |
6386 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6387 | md_probe, NULL, NULL); |
6388 | ||
1da177e4 | 6389 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6390 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6391 | |
6392 | md_geninit(); | |
d710e138 | 6393 | return 0; |
1da177e4 LT |
6394 | } |
6395 | ||
6396 | ||
6397 | #ifndef MODULE | |
6398 | ||
6399 | /* | |
6400 | * Searches all registered partitions for autorun RAID arrays | |
6401 | * at boot time. | |
6402 | */ | |
4d936ec1 ME |
6403 | |
6404 | static LIST_HEAD(all_detected_devices); | |
6405 | struct detected_devices_node { | |
6406 | struct list_head list; | |
6407 | dev_t dev; | |
6408 | }; | |
1da177e4 LT |
6409 | |
6410 | void md_autodetect_dev(dev_t dev) | |
6411 | { | |
4d936ec1 ME |
6412 | struct detected_devices_node *node_detected_dev; |
6413 | ||
6414 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6415 | if (node_detected_dev) { | |
6416 | node_detected_dev->dev = dev; | |
6417 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6418 | } else { | |
6419 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6420 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6421 | } | |
1da177e4 LT |
6422 | } |
6423 | ||
6424 | ||
6425 | static void autostart_arrays(int part) | |
6426 | { | |
6427 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6428 | struct detected_devices_node *node_detected_dev; |
6429 | dev_t dev; | |
6430 | int i_scanned, i_passed; | |
1da177e4 | 6431 | |
4d936ec1 ME |
6432 | i_scanned = 0; |
6433 | i_passed = 0; | |
1da177e4 | 6434 | |
4d936ec1 | 6435 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6436 | |
4d936ec1 ME |
6437 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6438 | i_scanned++; | |
6439 | node_detected_dev = list_entry(all_detected_devices.next, | |
6440 | struct detected_devices_node, list); | |
6441 | list_del(&node_detected_dev->list); | |
6442 | dev = node_detected_dev->dev; | |
6443 | kfree(node_detected_dev); | |
df968c4e | 6444 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6445 | if (IS_ERR(rdev)) |
6446 | continue; | |
6447 | ||
b2d444d7 | 6448 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6449 | MD_BUG(); |
6450 | continue; | |
6451 | } | |
d0fae18f | 6452 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6453 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6454 | i_passed++; |
1da177e4 | 6455 | } |
4d936ec1 ME |
6456 | |
6457 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6458 | i_scanned, i_passed); | |
1da177e4 LT |
6459 | |
6460 | autorun_devices(part); | |
6461 | } | |
6462 | ||
fdee8ae4 | 6463 | #endif /* !MODULE */ |
1da177e4 LT |
6464 | |
6465 | static __exit void md_exit(void) | |
6466 | { | |
6467 | mddev_t *mddev; | |
6468 | struct list_head *tmp; | |
8ab5e4c1 | 6469 | |
e8703fe1 N |
6470 | blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS); |
6471 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
1da177e4 LT |
6472 | |
6473 | unregister_blkdev(MAJOR_NR,"md"); | |
6474 | unregister_blkdev(mdp_major, "mdp"); | |
6475 | unregister_reboot_notifier(&md_notifier); | |
6476 | unregister_sysctl_table(raid_table_header); | |
6477 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6478 | for_each_mddev(mddev, tmp) { |
1da177e4 | 6479 | export_array(mddev); |
d3374825 | 6480 | mddev->hold_active = 0; |
1da177e4 LT |
6481 | } |
6482 | } | |
6483 | ||
685784aa | 6484 | subsys_initcall(md_init); |
1da177e4 LT |
6485 | module_exit(md_exit) |
6486 | ||
f91de92e N |
6487 | static int get_ro(char *buffer, struct kernel_param *kp) |
6488 | { | |
6489 | return sprintf(buffer, "%d", start_readonly); | |
6490 | } | |
6491 | static int set_ro(const char *val, struct kernel_param *kp) | |
6492 | { | |
6493 | char *e; | |
6494 | int num = simple_strtoul(val, &e, 10); | |
6495 | if (*val && (*e == '\0' || *e == '\n')) { | |
6496 | start_readonly = num; | |
4dbcdc75 | 6497 | return 0; |
f91de92e N |
6498 | } |
6499 | return -EINVAL; | |
6500 | } | |
6501 | ||
80ca3a44 N |
6502 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6503 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6504 | |
f91de92e | 6505 | |
1da177e4 LT |
6506 | EXPORT_SYMBOL(register_md_personality); |
6507 | EXPORT_SYMBOL(unregister_md_personality); | |
6508 | EXPORT_SYMBOL(md_error); | |
6509 | EXPORT_SYMBOL(md_done_sync); | |
6510 | EXPORT_SYMBOL(md_write_start); | |
6511 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6512 | EXPORT_SYMBOL(md_register_thread); |
6513 | EXPORT_SYMBOL(md_unregister_thread); | |
6514 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6515 | EXPORT_SYMBOL(md_check_recovery); |
6516 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6517 | MODULE_ALIAS("md"); |
72008652 | 6518 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |