Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.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> |
bff61975 N |
48 | #include <linux/raid/md_p.h> |
49 | #include <linux/raid/md_u.h> | |
43b2e5d8 | 50 | #include "md.h" |
ef740c37 | 51 | #include "bitmap.h" |
32a7627c | 52 | |
1da177e4 LT |
53 | #define DEBUG 0 |
54 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
55 | ||
56 | ||
57 | #ifndef MODULE | |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
2604b703 | 61 | static LIST_HEAD(pers_list); |
1da177e4 LT |
62 | static DEFINE_SPINLOCK(pers_lock); |
63 | ||
5e56341d AB |
64 | static void md_print_devices(void); |
65 | ||
90b08710 BS |
66 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
67 | ||
5e56341d AB |
68 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
69 | ||
1da177e4 LT |
70 | /* |
71 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
72 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
73 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 74 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
75 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
76 | * speed limit - in case reconstruction slows down your system despite | |
77 | * idle IO detection. | |
78 | * | |
79 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 80 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
81 | */ |
82 | ||
83 | static int sysctl_speed_limit_min = 1000; | |
84 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
85 | static inline int speed_min(mddev_t *mddev) |
86 | { | |
87 | return mddev->sync_speed_min ? | |
88 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
89 | } | |
90 | ||
91 | static inline int speed_max(mddev_t *mddev) | |
92 | { | |
93 | return mddev->sync_speed_max ? | |
94 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
95 | } | |
1da177e4 LT |
96 | |
97 | static struct ctl_table_header *raid_table_header; | |
98 | ||
99 | static ctl_table raid_table[] = { | |
100 | { | |
101 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
102 | .procname = "speed_limit_min", | |
103 | .data = &sysctl_speed_limit_min, | |
104 | .maxlen = sizeof(int), | |
80ca3a44 | 105 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
106 | .proc_handler = &proc_dointvec, |
107 | }, | |
108 | { | |
109 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
110 | .procname = "speed_limit_max", | |
111 | .data = &sysctl_speed_limit_max, | |
112 | .maxlen = sizeof(int), | |
80ca3a44 | 113 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
114 | .proc_handler = &proc_dointvec, |
115 | }, | |
116 | { .ctl_name = 0 } | |
117 | }; | |
118 | ||
119 | static ctl_table raid_dir_table[] = { | |
120 | { | |
121 | .ctl_name = DEV_RAID, | |
122 | .procname = "raid", | |
123 | .maxlen = 0, | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
125 | .child = raid_table, |
126 | }, | |
127 | { .ctl_name = 0 } | |
128 | }; | |
129 | ||
130 | static ctl_table raid_root_table[] = { | |
131 | { | |
132 | .ctl_name = CTL_DEV, | |
133 | .procname = "dev", | |
134 | .maxlen = 0, | |
135 | .mode = 0555, | |
136 | .child = raid_dir_table, | |
137 | }, | |
138 | { .ctl_name = 0 } | |
139 | }; | |
140 | ||
141 | static struct block_device_operations md_fops; | |
142 | ||
f91de92e N |
143 | static int start_readonly; |
144 | ||
d7603b7e N |
145 | /* |
146 | * We have a system wide 'event count' that is incremented | |
147 | * on any 'interesting' event, and readers of /proc/mdstat | |
148 | * can use 'poll' or 'select' to find out when the event | |
149 | * count increases. | |
150 | * | |
151 | * Events are: | |
152 | * start array, stop array, error, add device, remove device, | |
153 | * start build, activate spare | |
154 | */ | |
2989ddbd | 155 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 156 | static atomic_t md_event_count; |
29269553 | 157 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
158 | { |
159 | atomic_inc(&md_event_count); | |
160 | wake_up(&md_event_waiters); | |
161 | } | |
29269553 | 162 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 163 | |
c331eb04 N |
164 | /* Alternate version that can be called from interrupts |
165 | * when calling sysfs_notify isn't needed. | |
166 | */ | |
05381954 | 167 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
168 | { |
169 | atomic_inc(&md_event_count); | |
170 | wake_up(&md_event_waiters); | |
171 | } | |
172 | ||
1da177e4 LT |
173 | /* |
174 | * Enables to iterate over all existing md arrays | |
175 | * all_mddevs_lock protects this list. | |
176 | */ | |
177 | static LIST_HEAD(all_mddevs); | |
178 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
179 | ||
180 | ||
181 | /* | |
182 | * iterates through all used mddevs in the system. | |
183 | * We take care to grab the all_mddevs_lock whenever navigating | |
184 | * the list, and to always hold a refcount when unlocked. | |
185 | * Any code which breaks out of this loop while own | |
186 | * a reference to the current mddev and must mddev_put it. | |
187 | */ | |
29ac4aa3 | 188 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
189 | \ |
190 | for (({ spin_lock(&all_mddevs_lock); \ | |
191 | tmp = all_mddevs.next; \ | |
192 | mddev = NULL;}); \ | |
193 | ({ if (tmp != &all_mddevs) \ | |
194 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
195 | spin_unlock(&all_mddevs_lock); \ | |
196 | if (mddev) mddev_put(mddev); \ | |
197 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
198 | tmp != &all_mddevs;}); \ | |
199 | ({ spin_lock(&all_mddevs_lock); \ | |
200 | tmp = tmp->next;}) \ | |
201 | ) | |
202 | ||
203 | ||
d710e138 | 204 | static int md_fail_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 205 | { |
6712ecf8 | 206 | bio_io_error(bio); |
1da177e4 LT |
207 | return 0; |
208 | } | |
209 | ||
210 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
211 | { | |
212 | atomic_inc(&mddev->active); | |
213 | return mddev; | |
214 | } | |
215 | ||
d3374825 N |
216 | static void mddev_delayed_delete(struct work_struct *ws) |
217 | { | |
218 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
219 | kobject_del(&mddev->kobj); | |
220 | kobject_put(&mddev->kobj); | |
221 | } | |
222 | ||
1da177e4 LT |
223 | static void mddev_put(mddev_t *mddev) |
224 | { | |
225 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
226 | return; | |
d3374825 N |
227 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
228 | !mddev->hold_active) { | |
1da177e4 | 229 | list_del(&mddev->all_mddevs); |
d3374825 N |
230 | if (mddev->gendisk) { |
231 | /* we did a probe so need to clean up. | |
232 | * Call schedule_work inside the spinlock | |
233 | * so that flush_scheduled_work() after | |
234 | * mddev_find will succeed in waiting for the | |
235 | * work to be done. | |
236 | */ | |
237 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
238 | schedule_work(&mddev->del_work); | |
239 | } else | |
240 | kfree(mddev); | |
241 | } | |
242 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
243 | } |
244 | ||
245 | static mddev_t * mddev_find(dev_t unit) | |
246 | { | |
247 | mddev_t *mddev, *new = NULL; | |
248 | ||
249 | retry: | |
250 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
251 | |
252 | if (unit) { | |
253 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
254 | if (mddev->unit == unit) { | |
255 | mddev_get(mddev); | |
256 | spin_unlock(&all_mddevs_lock); | |
257 | kfree(new); | |
258 | return mddev; | |
259 | } | |
260 | ||
261 | if (new) { | |
262 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 263 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
264 | new->hold_active = UNTIL_IOCTL; |
265 | return new; | |
1da177e4 | 266 | } |
efeb53c0 N |
267 | } else if (new) { |
268 | /* find an unused unit number */ | |
269 | static int next_minor = 512; | |
270 | int start = next_minor; | |
271 | int is_free = 0; | |
272 | int dev = 0; | |
273 | while (!is_free) { | |
274 | dev = MKDEV(MD_MAJOR, next_minor); | |
275 | next_minor++; | |
276 | if (next_minor > MINORMASK) | |
277 | next_minor = 0; | |
278 | if (next_minor == start) { | |
279 | /* Oh dear, all in use. */ | |
280 | spin_unlock(&all_mddevs_lock); | |
281 | kfree(new); | |
282 | return NULL; | |
283 | } | |
284 | ||
285 | is_free = 1; | |
286 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
287 | if (mddev->unit == dev) { | |
288 | is_free = 0; | |
289 | break; | |
290 | } | |
291 | } | |
292 | new->unit = dev; | |
293 | new->md_minor = MINOR(dev); | |
294 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
295 | list_add(&new->all_mddevs, &all_mddevs); |
296 | spin_unlock(&all_mddevs_lock); | |
297 | return new; | |
298 | } | |
299 | spin_unlock(&all_mddevs_lock); | |
300 | ||
9ffae0cf | 301 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
302 | if (!new) |
303 | return NULL; | |
304 | ||
1da177e4 LT |
305 | new->unit = unit; |
306 | if (MAJOR(unit) == MD_MAJOR) | |
307 | new->md_minor = MINOR(unit); | |
308 | else | |
309 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
310 | ||
df5b89b3 | 311 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
312 | INIT_LIST_HEAD(&new->disks); |
313 | INIT_LIST_HEAD(&new->all_mddevs); | |
314 | init_timer(&new->safemode_timer); | |
315 | atomic_set(&new->active, 1); | |
f2ea68cf | 316 | atomic_set(&new->openers, 0); |
06d91a5f | 317 | spin_lock_init(&new->write_lock); |
3d310eb7 | 318 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 319 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 320 | new->reshape_position = MaxSector; |
5e96ee65 | 321 | new->resync_min = 0; |
c6207277 | 322 | new->resync_max = MaxSector; |
d897dbf9 | 323 | new->level = LEVEL_NONE; |
1da177e4 | 324 | |
1da177e4 LT |
325 | goto retry; |
326 | } | |
327 | ||
328 | static inline int mddev_lock(mddev_t * mddev) | |
329 | { | |
df5b89b3 | 330 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
331 | } |
332 | ||
1da177e4 LT |
333 | static inline int mddev_trylock(mddev_t * mddev) |
334 | { | |
df5b89b3 | 335 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
336 | } |
337 | ||
338 | static inline void mddev_unlock(mddev_t * mddev) | |
339 | { | |
df5b89b3 | 340 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 341 | |
005eca5e | 342 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
343 | } |
344 | ||
2989ddbd | 345 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 346 | { |
159ec1fc | 347 | mdk_rdev_t *rdev; |
1da177e4 | 348 | |
159ec1fc | 349 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
350 | if (rdev->desc_nr == nr) |
351 | return rdev; | |
159ec1fc | 352 | |
1da177e4 LT |
353 | return NULL; |
354 | } | |
355 | ||
356 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
357 | { | |
1da177e4 LT |
358 | mdk_rdev_t *rdev; |
359 | ||
159ec1fc | 360 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
361 | if (rdev->bdev->bd_dev == dev) |
362 | return rdev; | |
159ec1fc | 363 | |
1da177e4 LT |
364 | return NULL; |
365 | } | |
366 | ||
d9d166c2 | 367 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
368 | { |
369 | struct mdk_personality *pers; | |
d9d166c2 N |
370 | list_for_each_entry(pers, &pers_list, list) { |
371 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 372 | return pers; |
d9d166c2 N |
373 | if (strcmp(pers->name, clevel)==0) |
374 | return pers; | |
375 | } | |
2604b703 N |
376 | return NULL; |
377 | } | |
378 | ||
b73df2d3 | 379 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 380 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 381 | { |
b73df2d3 AN |
382 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
383 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
384 | } |
385 | ||
e7debaa4 | 386 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 387 | { |
0f420358 | 388 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
389 | |
390 | if (chunk_size) | |
e7debaa4 AN |
391 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
392 | return num_sectors; | |
1da177e4 LT |
393 | } |
394 | ||
395 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
396 | { | |
397 | if (rdev->sb_page) | |
398 | MD_BUG(); | |
399 | ||
400 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
401 | if (!rdev->sb_page) { | |
402 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 403 | return -ENOMEM; |
1da177e4 LT |
404 | } |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | static void free_disk_sb(mdk_rdev_t * rdev) | |
410 | { | |
411 | if (rdev->sb_page) { | |
2d1f3b5d | 412 | put_page(rdev->sb_page); |
1da177e4 LT |
413 | rdev->sb_loaded = 0; |
414 | rdev->sb_page = NULL; | |
0f420358 | 415 | rdev->sb_start = 0; |
dd8ac336 | 416 | rdev->sectors = 0; |
1da177e4 LT |
417 | } |
418 | } | |
419 | ||
420 | ||
6712ecf8 | 421 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
422 | { |
423 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 424 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 425 | |
3a0f5bbb N |
426 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
427 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
428 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
429 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 430 | md_error(mddev, rdev); |
3a0f5bbb | 431 | } |
7bfa19f2 | 432 | |
a9701a30 N |
433 | if (atomic_dec_and_test(&mddev->pending_writes)) |
434 | wake_up(&mddev->sb_wait); | |
f8b58edf | 435 | bio_put(bio); |
7bfa19f2 N |
436 | } |
437 | ||
6712ecf8 | 438 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
439 | { |
440 | struct bio *bio2 = bio->bi_private; | |
441 | mdk_rdev_t *rdev = bio2->bi_private; | |
442 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
443 | |
444 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
445 | error == -EOPNOTSUPP) { | |
446 | unsigned long flags; | |
447 | /* barriers don't appear to be supported :-( */ | |
448 | set_bit(BarriersNotsupp, &rdev->flags); | |
449 | mddev->barriers_work = 0; | |
450 | spin_lock_irqsave(&mddev->write_lock, flags); | |
451 | bio2->bi_next = mddev->biolist; | |
452 | mddev->biolist = bio2; | |
453 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
454 | wake_up(&mddev->sb_wait); | |
455 | bio_put(bio); | |
6712ecf8 N |
456 | } else { |
457 | bio_put(bio2); | |
458 | bio->bi_private = rdev; | |
459 | super_written(bio, error); | |
a9701a30 | 460 | } |
a9701a30 N |
461 | } |
462 | ||
7bfa19f2 N |
463 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
464 | sector_t sector, int size, struct page *page) | |
465 | { | |
466 | /* write first size bytes of page to sector of rdev | |
467 | * Increment mddev->pending_writes before returning | |
468 | * and decrement it on completion, waking up sb_wait | |
469 | * if zero is reached. | |
470 | * If an error occurred, call md_error | |
a9701a30 N |
471 | * |
472 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
473 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
474 | */ |
475 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
93dbb393 | 476 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); |
7bfa19f2 N |
477 | |
478 | bio->bi_bdev = rdev->bdev; | |
479 | bio->bi_sector = sector; | |
480 | bio_add_page(bio, page, size, 0); | |
481 | bio->bi_private = rdev; | |
482 | bio->bi_end_io = super_written; | |
a9701a30 N |
483 | bio->bi_rw = rw; |
484 | ||
7bfa19f2 | 485 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
486 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
487 | struct bio *rbio; | |
488 | rw |= (1<<BIO_RW_BARRIER); | |
489 | rbio = bio_clone(bio, GFP_NOIO); | |
490 | rbio->bi_private = bio; | |
491 | rbio->bi_end_io = super_written_barrier; | |
492 | submit_bio(rw, rbio); | |
493 | } else | |
494 | submit_bio(rw, bio); | |
495 | } | |
496 | ||
497 | void md_super_wait(mddev_t *mddev) | |
498 | { | |
499 | /* wait for all superblock writes that were scheduled to complete. | |
500 | * if any had to be retried (due to BARRIER problems), retry them | |
501 | */ | |
502 | DEFINE_WAIT(wq); | |
503 | for(;;) { | |
504 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
505 | if (atomic_read(&mddev->pending_writes)==0) | |
506 | break; | |
507 | while (mddev->biolist) { | |
508 | struct bio *bio; | |
509 | spin_lock_irq(&mddev->write_lock); | |
510 | bio = mddev->biolist; | |
511 | mddev->biolist = bio->bi_next ; | |
512 | bio->bi_next = NULL; | |
513 | spin_unlock_irq(&mddev->write_lock); | |
514 | submit_bio(bio->bi_rw, bio); | |
515 | } | |
516 | schedule(); | |
517 | } | |
518 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
519 | } |
520 | ||
6712ecf8 | 521 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 522 | { |
1da177e4 | 523 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
524 | } |
525 | ||
a654b9d8 | 526 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
527 | struct page *page, int rw) |
528 | { | |
baaa2c51 | 529 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
530 | struct completion event; |
531 | int ret; | |
532 | ||
93dbb393 | 533 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
1da177e4 LT |
534 | |
535 | bio->bi_bdev = bdev; | |
536 | bio->bi_sector = sector; | |
537 | bio_add_page(bio, page, size, 0); | |
538 | init_completion(&event); | |
539 | bio->bi_private = &event; | |
540 | bio->bi_end_io = bi_complete; | |
541 | submit_bio(rw, bio); | |
542 | wait_for_completion(&event); | |
543 | ||
544 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
545 | bio_put(bio); | |
546 | return ret; | |
547 | } | |
a8745db2 | 548 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 549 | |
0002b271 | 550 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
551 | { |
552 | char b[BDEVNAME_SIZE]; | |
553 | if (!rdev->sb_page) { | |
554 | MD_BUG(); | |
555 | return -EINVAL; | |
556 | } | |
557 | if (rdev->sb_loaded) | |
558 | return 0; | |
559 | ||
560 | ||
0f420358 | 561 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
562 | goto fail; |
563 | rdev->sb_loaded = 1; | |
564 | return 0; | |
565 | ||
566 | fail: | |
567 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
568 | bdevname(rdev->bdev,b)); | |
569 | return -EINVAL; | |
570 | } | |
571 | ||
572 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
573 | { | |
05710466 AN |
574 | return sb1->set_uuid0 == sb2->set_uuid0 && |
575 | sb1->set_uuid1 == sb2->set_uuid1 && | |
576 | sb1->set_uuid2 == sb2->set_uuid2 && | |
577 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
578 | } |
579 | ||
1da177e4 LT |
580 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
581 | { | |
582 | int ret; | |
583 | mdp_super_t *tmp1, *tmp2; | |
584 | ||
585 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
586 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
587 | ||
588 | if (!tmp1 || !tmp2) { | |
589 | ret = 0; | |
35020f1a | 590 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
591 | goto abort; |
592 | } | |
593 | ||
594 | *tmp1 = *sb1; | |
595 | *tmp2 = *sb2; | |
596 | ||
597 | /* | |
598 | * nr_disks is not constant | |
599 | */ | |
600 | tmp1->nr_disks = 0; | |
601 | tmp2->nr_disks = 0; | |
602 | ||
ce0c8e05 | 603 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 604 | abort: |
990a8baf JJ |
605 | kfree(tmp1); |
606 | kfree(tmp2); | |
1da177e4 LT |
607 | return ret; |
608 | } | |
609 | ||
4d167f09 N |
610 | |
611 | static u32 md_csum_fold(u32 csum) | |
612 | { | |
613 | csum = (csum & 0xffff) + (csum >> 16); | |
614 | return (csum & 0xffff) + (csum >> 16); | |
615 | } | |
616 | ||
1da177e4 LT |
617 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
618 | { | |
4d167f09 N |
619 | u64 newcsum = 0; |
620 | u32 *sb32 = (u32*)sb; | |
621 | int i; | |
1da177e4 LT |
622 | unsigned int disk_csum, csum; |
623 | ||
624 | disk_csum = sb->sb_csum; | |
625 | sb->sb_csum = 0; | |
4d167f09 N |
626 | |
627 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
628 | newcsum += sb32[i]; | |
629 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
630 | ||
631 | ||
632 | #ifdef CONFIG_ALPHA | |
633 | /* This used to use csum_partial, which was wrong for several | |
634 | * reasons including that different results are returned on | |
635 | * different architectures. It isn't critical that we get exactly | |
636 | * the same return value as before (we always csum_fold before | |
637 | * testing, and that removes any differences). However as we | |
638 | * know that csum_partial always returned a 16bit value on | |
639 | * alphas, do a fold to maximise conformity to previous behaviour. | |
640 | */ | |
641 | sb->sb_csum = md_csum_fold(disk_csum); | |
642 | #else | |
1da177e4 | 643 | sb->sb_csum = disk_csum; |
4d167f09 | 644 | #endif |
1da177e4 LT |
645 | return csum; |
646 | } | |
647 | ||
648 | ||
649 | /* | |
650 | * Handle superblock details. | |
651 | * We want to be able to handle multiple superblock formats | |
652 | * so we have a common interface to them all, and an array of | |
653 | * different handlers. | |
654 | * We rely on user-space to write the initial superblock, and support | |
655 | * reading and updating of superblocks. | |
656 | * Interface methods are: | |
657 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
658 | * loads and validates a superblock on dev. | |
659 | * if refdev != NULL, compare superblocks on both devices | |
660 | * Return: | |
661 | * 0 - dev has a superblock that is compatible with refdev | |
662 | * 1 - dev has a superblock that is compatible and newer than refdev | |
663 | * so dev should be used as the refdev in future | |
664 | * -EINVAL superblock incompatible or invalid | |
665 | * -othererror e.g. -EIO | |
666 | * | |
667 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
668 | * Verify that dev is acceptable into mddev. | |
669 | * The first time, mddev->raid_disks will be 0, and data from | |
670 | * dev should be merged in. Subsequent calls check that dev | |
671 | * is new enough. Return 0 or -EINVAL | |
672 | * | |
673 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
674 | * Update the superblock for rdev with data in mddev | |
675 | * This does not write to disc. | |
676 | * | |
677 | */ | |
678 | ||
679 | struct super_type { | |
0cd17fec CW |
680 | char *name; |
681 | struct module *owner; | |
682 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
683 | int minor_version); | |
684 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
685 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
686 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 687 | sector_t num_sectors); |
1da177e4 LT |
688 | }; |
689 | ||
690 | /* | |
691 | * load_super for 0.90.0 | |
692 | */ | |
693 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
694 | { | |
695 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
696 | mdp_super_t *sb; | |
697 | int ret; | |
1da177e4 LT |
698 | |
699 | /* | |
0f420358 | 700 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
701 | * it's at the end of the disk. |
702 | * | |
703 | * It also happens to be a multiple of 4Kb. | |
704 | */ | |
0f420358 | 705 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 706 | |
0002b271 | 707 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
708 | if (ret) return ret; |
709 | ||
710 | ret = -EINVAL; | |
711 | ||
712 | bdevname(rdev->bdev, b); | |
713 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
714 | ||
715 | if (sb->md_magic != MD_SB_MAGIC) { | |
716 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
717 | b); | |
718 | goto abort; | |
719 | } | |
720 | ||
721 | if (sb->major_version != 0 || | |
f6705578 N |
722 | sb->minor_version < 90 || |
723 | sb->minor_version > 91) { | |
1da177e4 LT |
724 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
725 | sb->major_version, sb->minor_version, | |
726 | b); | |
727 | goto abort; | |
728 | } | |
729 | ||
730 | if (sb->raid_disks <= 0) | |
731 | goto abort; | |
732 | ||
4d167f09 | 733 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
734 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
735 | b); | |
736 | goto abort; | |
737 | } | |
738 | ||
739 | rdev->preferred_minor = sb->md_minor; | |
740 | rdev->data_offset = 0; | |
0002b271 | 741 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 742 | |
e11e93fa N |
743 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
744 | if (sb->level != 1 && sb->level != 4 | |
745 | && sb->level != 5 && sb->level != 6 | |
746 | && sb->level != 10) { | |
747 | /* FIXME use a better test */ | |
748 | printk(KERN_WARNING | |
749 | "md: bitmaps not supported for this level.\n"); | |
750 | goto abort; | |
751 | } | |
752 | } | |
753 | ||
1da177e4 LT |
754 | if (sb->level == LEVEL_MULTIPATH) |
755 | rdev->desc_nr = -1; | |
756 | else | |
757 | rdev->desc_nr = sb->this_disk.number; | |
758 | ||
9a7b2b0f | 759 | if (!refdev) { |
1da177e4 | 760 | ret = 1; |
9a7b2b0f | 761 | } else { |
1da177e4 LT |
762 | __u64 ev1, ev2; |
763 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
764 | if (!uuid_equal(refsb, sb)) { | |
765 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
766 | b, bdevname(refdev->bdev,b2)); | |
767 | goto abort; | |
768 | } | |
769 | if (!sb_equal(refsb, sb)) { | |
770 | printk(KERN_WARNING "md: %s has same UUID" | |
771 | " but different superblock to %s\n", | |
772 | b, bdevname(refdev->bdev, b2)); | |
773 | goto abort; | |
774 | } | |
775 | ev1 = md_event(sb); | |
776 | ev2 = md_event(refsb); | |
777 | if (ev1 > ev2) | |
778 | ret = 1; | |
779 | else | |
780 | ret = 0; | |
781 | } | |
dd8ac336 | 782 | rdev->sectors = calc_num_sectors(rdev, sb->chunk_size); |
1da177e4 | 783 | |
dd8ac336 | 784 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
785 | /* "this cannot possibly happen" ... */ |
786 | ret = -EINVAL; | |
787 | ||
1da177e4 LT |
788 | abort: |
789 | return ret; | |
790 | } | |
791 | ||
792 | /* | |
793 | * validate_super for 0.90.0 | |
794 | */ | |
795 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
796 | { | |
797 | mdp_disk_t *desc; | |
798 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 799 | __u64 ev1 = md_event(sb); |
1da177e4 | 800 | |
41158c7e | 801 | rdev->raid_disk = -1; |
c5d79adb N |
802 | clear_bit(Faulty, &rdev->flags); |
803 | clear_bit(In_sync, &rdev->flags); | |
804 | clear_bit(WriteMostly, &rdev->flags); | |
805 | clear_bit(BarriersNotsupp, &rdev->flags); | |
806 | ||
1da177e4 LT |
807 | if (mddev->raid_disks == 0) { |
808 | mddev->major_version = 0; | |
809 | mddev->minor_version = sb->minor_version; | |
810 | mddev->patch_version = sb->patch_version; | |
e691063a | 811 | mddev->external = 0; |
1da177e4 LT |
812 | mddev->chunk_size = sb->chunk_size; |
813 | mddev->ctime = sb->ctime; | |
814 | mddev->utime = sb->utime; | |
815 | mddev->level = sb->level; | |
d9d166c2 | 816 | mddev->clevel[0] = 0; |
1da177e4 LT |
817 | mddev->layout = sb->layout; |
818 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 819 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 820 | mddev->events = ev1; |
9223214e | 821 | mddev->bitmap_offset = 0; |
36fa3063 | 822 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 823 | |
f6705578 N |
824 | if (mddev->minor_version >= 91) { |
825 | mddev->reshape_position = sb->reshape_position; | |
826 | mddev->delta_disks = sb->delta_disks; | |
827 | mddev->new_level = sb->new_level; | |
828 | mddev->new_layout = sb->new_layout; | |
829 | mddev->new_chunk = sb->new_chunk; | |
830 | } else { | |
831 | mddev->reshape_position = MaxSector; | |
832 | mddev->delta_disks = 0; | |
833 | mddev->new_level = mddev->level; | |
834 | mddev->new_layout = mddev->layout; | |
835 | mddev->new_chunk = mddev->chunk_size; | |
836 | } | |
837 | ||
1da177e4 LT |
838 | if (sb->state & (1<<MD_SB_CLEAN)) |
839 | mddev->recovery_cp = MaxSector; | |
840 | else { | |
841 | if (sb->events_hi == sb->cp_events_hi && | |
842 | sb->events_lo == sb->cp_events_lo) { | |
843 | mddev->recovery_cp = sb->recovery_cp; | |
844 | } else | |
845 | mddev->recovery_cp = 0; | |
846 | } | |
847 | ||
848 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
849 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
850 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
851 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
852 | ||
853 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
854 | |
855 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 856 | mddev->bitmap_file == NULL) |
36fa3063 | 857 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 858 | |
41158c7e N |
859 | } else if (mddev->pers == NULL) { |
860 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
861 | ++ev1; |
862 | if (ev1 < mddev->events) | |
863 | return -EINVAL; | |
41158c7e N |
864 | } else if (mddev->bitmap) { |
865 | /* if adding to array with a bitmap, then we can accept an | |
866 | * older device ... but not too old. | |
867 | */ | |
41158c7e N |
868 | if (ev1 < mddev->bitmap->events_cleared) |
869 | return 0; | |
07d84d10 N |
870 | } else { |
871 | if (ev1 < mddev->events) | |
872 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
873 | return 0; | |
874 | } | |
41158c7e | 875 | |
1da177e4 | 876 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
877 | desc = sb->disks + rdev->desc_nr; |
878 | ||
879 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 880 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
881 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
882 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 883 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
884 | rdev->raid_disk = desc->raid_disk; |
885 | } | |
8ddf9efe N |
886 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
887 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 888 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 889 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
890 | return 0; |
891 | } | |
892 | ||
893 | /* | |
894 | * sync_super for 0.90.0 | |
895 | */ | |
896 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
897 | { | |
898 | mdp_super_t *sb; | |
1da177e4 LT |
899 | mdk_rdev_t *rdev2; |
900 | int next_spare = mddev->raid_disks; | |
19133a42 | 901 | |
1da177e4 LT |
902 | |
903 | /* make rdev->sb match mddev data.. | |
904 | * | |
905 | * 1/ zero out disks | |
906 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
907 | * 3/ any empty disks < next_spare become removed | |
908 | * | |
909 | * disks[0] gets initialised to REMOVED because | |
910 | * we cannot be sure from other fields if it has | |
911 | * been initialised or not. | |
912 | */ | |
913 | int i; | |
914 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
915 | ||
61181565 N |
916 | rdev->sb_size = MD_SB_BYTES; |
917 | ||
1da177e4 LT |
918 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
919 | ||
920 | memset(sb, 0, sizeof(*sb)); | |
921 | ||
922 | sb->md_magic = MD_SB_MAGIC; | |
923 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
924 | sb->patch_version = mddev->patch_version; |
925 | sb->gvalid_words = 0; /* ignored */ | |
926 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
927 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
928 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
929 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
930 | ||
931 | sb->ctime = mddev->ctime; | |
932 | sb->level = mddev->level; | |
58c0fed4 | 933 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
934 | sb->raid_disks = mddev->raid_disks; |
935 | sb->md_minor = mddev->md_minor; | |
e691063a | 936 | sb->not_persistent = 0; |
1da177e4 LT |
937 | sb->utime = mddev->utime; |
938 | sb->state = 0; | |
939 | sb->events_hi = (mddev->events>>32); | |
940 | sb->events_lo = (u32)mddev->events; | |
941 | ||
f6705578 N |
942 | if (mddev->reshape_position == MaxSector) |
943 | sb->minor_version = 90; | |
944 | else { | |
945 | sb->minor_version = 91; | |
946 | sb->reshape_position = mddev->reshape_position; | |
947 | sb->new_level = mddev->new_level; | |
948 | sb->delta_disks = mddev->delta_disks; | |
949 | sb->new_layout = mddev->new_layout; | |
950 | sb->new_chunk = mddev->new_chunk; | |
951 | } | |
952 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
953 | if (mddev->in_sync) |
954 | { | |
955 | sb->recovery_cp = mddev->recovery_cp; | |
956 | sb->cp_events_hi = (mddev->events>>32); | |
957 | sb->cp_events_lo = (u32)mddev->events; | |
958 | if (mddev->recovery_cp == MaxSector) | |
959 | sb->state = (1<< MD_SB_CLEAN); | |
960 | } else | |
961 | sb->recovery_cp = 0; | |
962 | ||
963 | sb->layout = mddev->layout; | |
964 | sb->chunk_size = mddev->chunk_size; | |
965 | ||
a654b9d8 N |
966 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
967 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
968 | ||
1da177e4 | 969 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 970 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 971 | mdp_disk_t *d; |
86e6ffdd | 972 | int desc_nr; |
b2d444d7 N |
973 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
974 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 975 | desc_nr = rdev2->raid_disk; |
1da177e4 | 976 | else |
86e6ffdd | 977 | desc_nr = next_spare++; |
19133a42 | 978 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
979 | d = &sb->disks[rdev2->desc_nr]; |
980 | nr_disks++; | |
981 | d->number = rdev2->desc_nr; | |
982 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
983 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
984 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
985 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
986 | d->raid_disk = rdev2->raid_disk; |
987 | else | |
988 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 989 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 990 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 991 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
992 | d->state = (1<<MD_DISK_ACTIVE); |
993 | d->state |= (1<<MD_DISK_SYNC); | |
994 | active++; | |
995 | working++; | |
996 | } else { | |
997 | d->state = 0; | |
998 | spare++; | |
999 | working++; | |
1000 | } | |
8ddf9efe N |
1001 | if (test_bit(WriteMostly, &rdev2->flags)) |
1002 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1003 | } |
1da177e4 LT |
1004 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1005 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1006 | mdp_disk_t *d = &sb->disks[i]; | |
1007 | if (d->state == 0 && d->number == 0) { | |
1008 | d->number = i; | |
1009 | d->raid_disk = i; | |
1010 | d->state = (1<<MD_DISK_REMOVED); | |
1011 | d->state |= (1<<MD_DISK_FAULTY); | |
1012 | failed++; | |
1013 | } | |
1014 | } | |
1015 | sb->nr_disks = nr_disks; | |
1016 | sb->active_disks = active; | |
1017 | sb->working_disks = working; | |
1018 | sb->failed_disks = failed; | |
1019 | sb->spare_disks = spare; | |
1020 | ||
1021 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1022 | sb->sb_csum = calc_sb_csum(sb); | |
1023 | } | |
1024 | ||
0cd17fec CW |
1025 | /* |
1026 | * rdev_size_change for 0.90.0 | |
1027 | */ | |
1028 | static unsigned long long | |
15f4a5fd | 1029 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1030 | { |
58c0fed4 | 1031 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1032 | return 0; /* component must fit device */ |
0cd17fec CW |
1033 | if (rdev->mddev->bitmap_offset) |
1034 | return 0; /* can't move bitmap */ | |
0f420358 | 1035 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1036 | if (!num_sectors || num_sectors > rdev->sb_start) |
1037 | num_sectors = rdev->sb_start; | |
0f420358 | 1038 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1039 | rdev->sb_page); |
1040 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1041 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1042 | } |
1043 | ||
1044 | ||
1da177e4 LT |
1045 | /* |
1046 | * version 1 superblock | |
1047 | */ | |
1048 | ||
1c05b4bc | 1049 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1050 | { |
1c05b4bc N |
1051 | __le32 disk_csum; |
1052 | u32 csum; | |
1da177e4 LT |
1053 | unsigned long long newcsum; |
1054 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1055 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1056 | int i; |
1057 | ||
1058 | disk_csum = sb->sb_csum; | |
1059 | sb->sb_csum = 0; | |
1060 | newcsum = 0; | |
1061 | for (i=0; size>=4; size -= 4 ) | |
1062 | newcsum += le32_to_cpu(*isuper++); | |
1063 | ||
1064 | if (size == 2) | |
1c05b4bc | 1065 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1066 | |
1067 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1068 | sb->sb_csum = disk_csum; | |
1069 | return cpu_to_le32(csum); | |
1070 | } | |
1071 | ||
1072 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1073 | { | |
1074 | struct mdp_superblock_1 *sb; | |
1075 | int ret; | |
0f420358 | 1076 | sector_t sb_start; |
1da177e4 | 1077 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1078 | int bmask; |
1da177e4 LT |
1079 | |
1080 | /* | |
0f420358 | 1081 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1082 | * It is always aligned to a 4K boundary and |
1083 | * depeding on minor_version, it can be: | |
1084 | * 0: At least 8K, but less than 12K, from end of device | |
1085 | * 1: At start of device | |
1086 | * 2: 4K from start of device. | |
1087 | */ | |
1088 | switch(minor_version) { | |
1089 | case 0: | |
0f420358 AN |
1090 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1091 | sb_start -= 8*2; | |
1092 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1093 | break; |
1094 | case 1: | |
0f420358 | 1095 | sb_start = 0; |
1da177e4 LT |
1096 | break; |
1097 | case 2: | |
0f420358 | 1098 | sb_start = 8; |
1da177e4 LT |
1099 | break; |
1100 | default: | |
1101 | return -EINVAL; | |
1102 | } | |
0f420358 | 1103 | rdev->sb_start = sb_start; |
1da177e4 | 1104 | |
0002b271 N |
1105 | /* superblock is rarely larger than 1K, but it can be larger, |
1106 | * and it is safe to read 4k, so we do that | |
1107 | */ | |
1108 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1109 | if (ret) return ret; |
1110 | ||
1111 | ||
1112 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1113 | ||
1114 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1115 | sb->major_version != cpu_to_le32(1) || | |
1116 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1117 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1118 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1119 | return -EINVAL; |
1120 | ||
1121 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1122 | printk("md: invalid superblock checksum on %s\n", | |
1123 | bdevname(rdev->bdev,b)); | |
1124 | return -EINVAL; | |
1125 | } | |
1126 | if (le64_to_cpu(sb->data_size) < 10) { | |
1127 | printk("md: data_size too small on %s\n", | |
1128 | bdevname(rdev->bdev,b)); | |
1129 | return -EINVAL; | |
1130 | } | |
e11e93fa N |
1131 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1132 | if (sb->level != cpu_to_le32(1) && | |
1133 | sb->level != cpu_to_le32(4) && | |
1134 | sb->level != cpu_to_le32(5) && | |
1135 | sb->level != cpu_to_le32(6) && | |
1136 | sb->level != cpu_to_le32(10)) { | |
1137 | printk(KERN_WARNING | |
1138 | "md: bitmaps not supported for this level.\n"); | |
1139 | return -EINVAL; | |
1140 | } | |
1141 | } | |
1142 | ||
1da177e4 LT |
1143 | rdev->preferred_minor = 0xffff; |
1144 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1145 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1146 | |
0002b271 | 1147 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1148 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1149 | if (rdev->sb_size & bmask) |
a1801f85 N |
1150 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1151 | ||
1152 | if (minor_version | |
0f420358 | 1153 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1154 | return -EINVAL; |
0002b271 | 1155 | |
31b65a0d N |
1156 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1157 | rdev->desc_nr = -1; | |
1158 | else | |
1159 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1160 | ||
9a7b2b0f | 1161 | if (!refdev) { |
8ed75463 | 1162 | ret = 1; |
9a7b2b0f | 1163 | } else { |
1da177e4 LT |
1164 | __u64 ev1, ev2; |
1165 | struct mdp_superblock_1 *refsb = | |
1166 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1167 | ||
1168 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1169 | sb->level != refsb->level || | |
1170 | sb->layout != refsb->layout || | |
1171 | sb->chunksize != refsb->chunksize) { | |
1172 | printk(KERN_WARNING "md: %s has strangely different" | |
1173 | " superblock to %s\n", | |
1174 | bdevname(rdev->bdev,b), | |
1175 | bdevname(refdev->bdev,b2)); | |
1176 | return -EINVAL; | |
1177 | } | |
1178 | ev1 = le64_to_cpu(sb->events); | |
1179 | ev2 = le64_to_cpu(refsb->events); | |
1180 | ||
1181 | if (ev1 > ev2) | |
8ed75463 N |
1182 | ret = 1; |
1183 | else | |
1184 | ret = 0; | |
1da177e4 | 1185 | } |
a1801f85 | 1186 | if (minor_version) |
dd8ac336 AN |
1187 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
1188 | le64_to_cpu(sb->data_offset); | |
1da177e4 | 1189 | else |
dd8ac336 AN |
1190 | rdev->sectors = rdev->sb_start; |
1191 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1192 | return -EINVAL; |
dd8ac336 | 1193 | rdev->sectors = le64_to_cpu(sb->data_size); |
1da177e4 | 1194 | if (le32_to_cpu(sb->chunksize)) |
dd8ac336 | 1195 | rdev->sectors &= ~((sector_t)le32_to_cpu(sb->chunksize) - 1); |
2bf071bf | 1196 | |
dd8ac336 | 1197 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1198 | return -EINVAL; |
8ed75463 | 1199 | return ret; |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1203 | { | |
1204 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1205 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1206 | |
41158c7e | 1207 | rdev->raid_disk = -1; |
c5d79adb N |
1208 | clear_bit(Faulty, &rdev->flags); |
1209 | clear_bit(In_sync, &rdev->flags); | |
1210 | clear_bit(WriteMostly, &rdev->flags); | |
1211 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1212 | ||
1da177e4 LT |
1213 | if (mddev->raid_disks == 0) { |
1214 | mddev->major_version = 1; | |
1215 | mddev->patch_version = 0; | |
e691063a | 1216 | mddev->external = 0; |
1da177e4 LT |
1217 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1218 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1219 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1220 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1221 | mddev->clevel[0] = 0; |
1da177e4 LT |
1222 | mddev->layout = le32_to_cpu(sb->layout); |
1223 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1224 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1225 | mddev->events = ev1; |
9223214e | 1226 | mddev->bitmap_offset = 0; |
29fc7e3e | 1227 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1228 | |
1229 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1230 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1231 | ||
1232 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1233 | |
71c0805c | 1234 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1235 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1236 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1237 | |
f6705578 N |
1238 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1239 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1240 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1241 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1242 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1243 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1244 | } else { | |
1245 | mddev->reshape_position = MaxSector; | |
1246 | mddev->delta_disks = 0; | |
1247 | mddev->new_level = mddev->level; | |
1248 | mddev->new_layout = mddev->layout; | |
1249 | mddev->new_chunk = mddev->chunk_size; | |
1250 | } | |
1251 | ||
41158c7e N |
1252 | } else if (mddev->pers == NULL) { |
1253 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1254 | ++ev1; |
1255 | if (ev1 < mddev->events) | |
1256 | return -EINVAL; | |
41158c7e N |
1257 | } else if (mddev->bitmap) { |
1258 | /* If adding to array with a bitmap, then we can accept an | |
1259 | * older device, but not too old. | |
1260 | */ | |
41158c7e N |
1261 | if (ev1 < mddev->bitmap->events_cleared) |
1262 | return 0; | |
07d84d10 N |
1263 | } else { |
1264 | if (ev1 < mddev->events) | |
1265 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1266 | return 0; | |
1267 | } | |
1da177e4 LT |
1268 | if (mddev->level != LEVEL_MULTIPATH) { |
1269 | int role; | |
1da177e4 LT |
1270 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1271 | switch(role) { | |
1272 | case 0xffff: /* spare */ | |
1da177e4 LT |
1273 | break; |
1274 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1275 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1276 | break; |
1277 | default: | |
5fd6c1dc N |
1278 | if ((le32_to_cpu(sb->feature_map) & |
1279 | MD_FEATURE_RECOVERY_OFFSET)) | |
1280 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1281 | else | |
1282 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1283 | rdev->raid_disk = role; |
1284 | break; | |
1285 | } | |
8ddf9efe N |
1286 | if (sb->devflags & WriteMostly1) |
1287 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1288 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1289 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1290 | |
1da177e4 LT |
1291 | return 0; |
1292 | } | |
1293 | ||
1294 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1295 | { | |
1296 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1297 | mdk_rdev_t *rdev2; |
1298 | int max_dev, i; | |
1299 | /* make rdev->sb match mddev and rdev data. */ | |
1300 | ||
1301 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1302 | ||
1303 | sb->feature_map = 0; | |
1304 | sb->pad0 = 0; | |
5fd6c1dc | 1305 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1306 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1307 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1308 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1309 | ||
1310 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1311 | sb->events = cpu_to_le64(mddev->events); | |
1312 | if (mddev->in_sync) | |
1313 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1314 | else | |
1315 | sb->resync_offset = cpu_to_le64(0); | |
1316 | ||
1c05b4bc | 1317 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1318 | |
f0ca340c | 1319 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1320 | sb->size = cpu_to_le64(mddev->dev_sectors); |
f0ca340c | 1321 | |
a654b9d8 N |
1322 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1323 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1324 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1325 | } |
5fd6c1dc N |
1326 | |
1327 | if (rdev->raid_disk >= 0 && | |
97e4f42d N |
1328 | !test_bit(In_sync, &rdev->flags)) { |
1329 | if (mddev->curr_resync_completed > rdev->recovery_offset) | |
1330 | rdev->recovery_offset = mddev->curr_resync_completed; | |
1331 | if (rdev->recovery_offset > 0) { | |
1332 | sb->feature_map |= | |
1333 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1334 | sb->recovery_offset = | |
1335 | cpu_to_le64(rdev->recovery_offset); | |
1336 | } | |
5fd6c1dc N |
1337 | } |
1338 | ||
f6705578 N |
1339 | if (mddev->reshape_position != MaxSector) { |
1340 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1341 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1342 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1343 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1344 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1345 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1346 | } | |
a654b9d8 | 1347 | |
1da177e4 | 1348 | max_dev = 0; |
159ec1fc | 1349 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1350 | if (rdev2->desc_nr+1 > max_dev) |
1351 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1352 | |
1353 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1354 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1355 | for (i=0; i<max_dev;i++) |
1356 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1357 | ||
159ec1fc | 1358 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1359 | i = rdev2->desc_nr; |
b2d444d7 | 1360 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1361 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1362 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1363 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1364 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1365 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1366 | else |
1367 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1368 | } | |
1369 | ||
1da177e4 LT |
1370 | sb->sb_csum = calc_sb_1_csum(sb); |
1371 | } | |
1372 | ||
0cd17fec | 1373 | static unsigned long long |
15f4a5fd | 1374 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1375 | { |
1376 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1377 | sector_t max_sectors; |
58c0fed4 | 1378 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1379 | return 0; /* component must fit device */ |
0f420358 | 1380 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1381 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1382 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1383 | max_sectors -= rdev->data_offset; | |
1384 | if (!num_sectors || num_sectors > max_sectors) | |
1385 | num_sectors = max_sectors; | |
0cd17fec CW |
1386 | } else if (rdev->mddev->bitmap_offset) { |
1387 | /* minor version 0 with bitmap we can't move */ | |
1388 | return 0; | |
1389 | } else { | |
1390 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1391 | sector_t sb_start; |
1392 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1393 | sb_start &= ~(sector_t)(4*2 - 1); | |
dd8ac336 | 1394 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1395 | if (!num_sectors || num_sectors > max_sectors) |
1396 | num_sectors = max_sectors; | |
0f420358 | 1397 | rdev->sb_start = sb_start; |
0cd17fec CW |
1398 | } |
1399 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1400 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1401 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1402 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1403 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1404 | rdev->sb_page); |
1405 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1406 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1407 | } |
1da177e4 | 1408 | |
75c96f85 | 1409 | static struct super_type super_types[] = { |
1da177e4 LT |
1410 | [0] = { |
1411 | .name = "0.90.0", | |
1412 | .owner = THIS_MODULE, | |
0cd17fec CW |
1413 | .load_super = super_90_load, |
1414 | .validate_super = super_90_validate, | |
1415 | .sync_super = super_90_sync, | |
1416 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1417 | }, |
1418 | [1] = { | |
1419 | .name = "md-1", | |
1420 | .owner = THIS_MODULE, | |
0cd17fec CW |
1421 | .load_super = super_1_load, |
1422 | .validate_super = super_1_validate, | |
1423 | .sync_super = super_1_sync, | |
1424 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1425 | }, |
1426 | }; | |
1da177e4 LT |
1427 | |
1428 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1429 | { | |
7dd5e7c3 | 1430 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1431 | |
4b80991c N |
1432 | rcu_read_lock(); |
1433 | rdev_for_each_rcu(rdev, mddev1) | |
1434 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1435 | if (rdev->bdev->bd_contains == |
4b80991c N |
1436 | rdev2->bdev->bd_contains) { |
1437 | rcu_read_unlock(); | |
7dd5e7c3 | 1438 | return 1; |
4b80991c N |
1439 | } |
1440 | rcu_read_unlock(); | |
1da177e4 LT |
1441 | return 0; |
1442 | } | |
1443 | ||
1444 | static LIST_HEAD(pending_raid_disks); | |
1445 | ||
3f9d99c1 MP |
1446 | static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev) |
1447 | { | |
1448 | struct mdk_personality *pers = mddev->pers; | |
1449 | struct gendisk *disk = mddev->gendisk; | |
1450 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); | |
1451 | struct blk_integrity *bi_mddev = blk_get_integrity(disk); | |
1452 | ||
1453 | /* Data integrity passthrough not supported on RAID 4, 5 and 6 */ | |
1454 | if (pers && pers->level >= 4 && pers->level <= 6) | |
1455 | return; | |
1456 | ||
1457 | /* If rdev is integrity capable, register profile for mddev */ | |
1458 | if (!bi_mddev && bi_rdev) { | |
1459 | if (blk_integrity_register(disk, bi_rdev)) | |
1460 | printk(KERN_ERR "%s: %s Could not register integrity!\n", | |
1461 | __func__, disk->disk_name); | |
1462 | else | |
1463 | printk(KERN_NOTICE "Enabling data integrity on %s\n", | |
1464 | disk->disk_name); | |
1465 | return; | |
1466 | } | |
1467 | ||
1468 | /* Check that mddev and rdev have matching profiles */ | |
1469 | if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) { | |
1470 | printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__, | |
1471 | disk->disk_name, rdev->bdev->bd_disk->disk_name); | |
1472 | printk(KERN_NOTICE "Disabling data integrity on %s\n", | |
1473 | disk->disk_name); | |
1474 | blk_integrity_unregister(disk); | |
1475 | } | |
1476 | } | |
1477 | ||
1da177e4 LT |
1478 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1479 | { | |
7dd5e7c3 | 1480 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1481 | struct kobject *ko; |
1edf80d3 | 1482 | char *s; |
5e55e2f5 | 1483 | int err; |
1da177e4 LT |
1484 | |
1485 | if (rdev->mddev) { | |
1486 | MD_BUG(); | |
1487 | return -EINVAL; | |
1488 | } | |
11e2ede0 DW |
1489 | |
1490 | /* prevent duplicates */ | |
1491 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1492 | return -EEXIST; | |
1493 | ||
dd8ac336 AN |
1494 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1495 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1496 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1497 | if (mddev->pers) { |
1498 | /* Cannot change size, so fail | |
1499 | * If mddev->level <= 0, then we don't care | |
1500 | * about aligning sizes (e.g. linear) | |
1501 | */ | |
1502 | if (mddev->level > 0) | |
1503 | return -ENOSPC; | |
1504 | } else | |
dd8ac336 | 1505 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1506 | } |
1da177e4 LT |
1507 | |
1508 | /* Verify rdev->desc_nr is unique. | |
1509 | * If it is -1, assign a free number, else | |
1510 | * check number is not in use | |
1511 | */ | |
1512 | if (rdev->desc_nr < 0) { | |
1513 | int choice = 0; | |
1514 | if (mddev->pers) choice = mddev->raid_disks; | |
1515 | while (find_rdev_nr(mddev, choice)) | |
1516 | choice++; | |
1517 | rdev->desc_nr = choice; | |
1518 | } else { | |
1519 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1520 | return -EBUSY; | |
1521 | } | |
de01dfad N |
1522 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1523 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1524 | mdname(mddev), mddev->max_disks); | |
1525 | return -EBUSY; | |
1526 | } | |
19133a42 | 1527 | bdevname(rdev->bdev,b); |
649316b2 | 1528 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1529 | *s = '!'; |
649316b2 | 1530 | |
1da177e4 | 1531 | rdev->mddev = mddev; |
19133a42 | 1532 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1533 | |
b2d6db58 | 1534 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1535 | goto fail; |
86e6ffdd | 1536 | |
0762b8bd | 1537 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1538 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1539 | kobject_del(&rdev->kobj); | |
1540 | goto fail; | |
1541 | } | |
3c0ee63a N |
1542 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1543 | ||
4b80991c | 1544 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1545 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1546 | |
1547 | /* May as well allow recovery to be retried once */ | |
1548 | mddev->recovery_disabled = 0; | |
3f9d99c1 MP |
1549 | |
1550 | md_integrity_check(rdev, mddev); | |
1da177e4 | 1551 | return 0; |
5e55e2f5 N |
1552 | |
1553 | fail: | |
1554 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1555 | b, mdname(mddev)); | |
1556 | return err; | |
1da177e4 LT |
1557 | } |
1558 | ||
177a99b2 | 1559 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1560 | { |
1561 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1562 | kobject_del(&rdev->kobj); | |
177a99b2 | 1563 | kobject_put(&rdev->kobj); |
5792a285 N |
1564 | } |
1565 | ||
1da177e4 LT |
1566 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1567 | { | |
1568 | char b[BDEVNAME_SIZE]; | |
1569 | if (!rdev->mddev) { | |
1570 | MD_BUG(); | |
1571 | return; | |
1572 | } | |
5463c790 | 1573 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1574 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1575 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1576 | rdev->mddev = NULL; | |
86e6ffdd | 1577 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1578 | sysfs_put(rdev->sysfs_state); |
1579 | rdev->sysfs_state = NULL; | |
5792a285 | 1580 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1581 | * writing to 'remove' to "dev/state". We also need |
1582 | * to delay it due to rcu usage. | |
5792a285 | 1583 | */ |
4b80991c | 1584 | synchronize_rcu(); |
177a99b2 N |
1585 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1586 | kobject_get(&rdev->kobj); | |
5792a285 | 1587 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1588 | } |
1589 | ||
1590 | /* | |
1591 | * prevent the device from being mounted, repartitioned or | |
1592 | * otherwise reused by a RAID array (or any other kernel | |
1593 | * subsystem), by bd_claiming the device. | |
1594 | */ | |
c5d79adb | 1595 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1596 | { |
1597 | int err = 0; | |
1598 | struct block_device *bdev; | |
1599 | char b[BDEVNAME_SIZE]; | |
1600 | ||
2e7b651d | 1601 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1602 | if (IS_ERR(bdev)) { |
1603 | printk(KERN_ERR "md: could not open %s.\n", | |
1604 | __bdevname(dev, b)); | |
1605 | return PTR_ERR(bdev); | |
1606 | } | |
c5d79adb | 1607 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1608 | if (err) { |
1609 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1610 | bdevname(bdev, b)); | |
9a1c3542 | 1611 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1612 | return err; |
1613 | } | |
c5d79adb N |
1614 | if (!shared) |
1615 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1616 | rdev->bdev = bdev; |
1617 | return err; | |
1618 | } | |
1619 | ||
1620 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1621 | { | |
1622 | struct block_device *bdev = rdev->bdev; | |
1623 | rdev->bdev = NULL; | |
1624 | if (!bdev) | |
1625 | MD_BUG(); | |
1626 | bd_release(bdev); | |
9a1c3542 | 1627 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1628 | } |
1629 | ||
1630 | void md_autodetect_dev(dev_t dev); | |
1631 | ||
1632 | static void export_rdev(mdk_rdev_t * rdev) | |
1633 | { | |
1634 | char b[BDEVNAME_SIZE]; | |
1635 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1636 | bdevname(rdev->bdev,b)); | |
1637 | if (rdev->mddev) | |
1638 | MD_BUG(); | |
1639 | free_disk_sb(rdev); | |
1da177e4 | 1640 | #ifndef MODULE |
d0fae18f N |
1641 | if (test_bit(AutoDetected, &rdev->flags)) |
1642 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1643 | #endif |
1644 | unlock_rdev(rdev); | |
86e6ffdd | 1645 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1646 | } |
1647 | ||
1648 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1649 | { | |
1650 | unbind_rdev_from_array(rdev); | |
1651 | export_rdev(rdev); | |
1652 | } | |
1653 | ||
1654 | static void export_array(mddev_t *mddev) | |
1655 | { | |
159ec1fc | 1656 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1657 | |
d089c6af | 1658 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1659 | if (!rdev->mddev) { |
1660 | MD_BUG(); | |
1661 | continue; | |
1662 | } | |
1663 | kick_rdev_from_array(rdev); | |
1664 | } | |
1665 | if (!list_empty(&mddev->disks)) | |
1666 | MD_BUG(); | |
1667 | mddev->raid_disks = 0; | |
1668 | mddev->major_version = 0; | |
1669 | } | |
1670 | ||
1671 | static void print_desc(mdp_disk_t *desc) | |
1672 | { | |
1673 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1674 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1675 | } | |
1676 | ||
cd2ac932 | 1677 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1678 | { |
1679 | int i; | |
1680 | ||
1681 | printk(KERN_INFO | |
1682 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1683 | sb->major_version, sb->minor_version, sb->patch_version, | |
1684 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1685 | sb->ctime); | |
1686 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1687 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1688 | sb->md_minor, sb->layout, sb->chunk_size); | |
1689 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1690 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1691 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1692 | sb->failed_disks, sb->spare_disks, | |
1693 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1694 | ||
1695 | printk(KERN_INFO); | |
1696 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1697 | mdp_disk_t *desc; | |
1698 | ||
1699 | desc = sb->disks + i; | |
1700 | if (desc->number || desc->major || desc->minor || | |
1701 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1702 | printk(" D %2d: ", i); | |
1703 | print_desc(desc); | |
1704 | } | |
1705 | } | |
1706 | printk(KERN_INFO "md: THIS: "); | |
1707 | print_desc(&sb->this_disk); | |
cd2ac932 | 1708 | } |
1da177e4 | 1709 | |
cd2ac932 CR |
1710 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1711 | { | |
1712 | __u8 *uuid; | |
1713 | ||
1714 | uuid = sb->set_uuid; | |
1715 | printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1716 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1717 | KERN_INFO "md: Name: \"%s\" CT:%llu\n", | |
1718 | le32_to_cpu(sb->major_version), | |
1719 | le32_to_cpu(sb->feature_map), | |
1720 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1721 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1722 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1723 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1724 | sb->set_name, | |
1725 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1726 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1727 | ||
1728 | uuid = sb->device_uuid; | |
1729 | printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
1730 | " RO:%llu\n" | |
1731 | KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" | |
1732 | ":%02x%02x%02x%02x%02x%02x\n" | |
1733 | KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1734 | KERN_INFO "md: (MaxDev:%u) \n", | |
1735 | le32_to_cpu(sb->level), | |
1736 | (unsigned long long)le64_to_cpu(sb->size), | |
1737 | le32_to_cpu(sb->raid_disks), | |
1738 | le32_to_cpu(sb->layout), | |
1739 | le32_to_cpu(sb->chunksize), | |
1740 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1741 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1742 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1743 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1744 | le32_to_cpu(sb->dev_number), | |
1745 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1746 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1747 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1748 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1749 | sb->devflags, | |
1750 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1751 | (unsigned long long)le64_to_cpu(sb->events), | |
1752 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1753 | le32_to_cpu(sb->sb_csum), | |
1754 | le32_to_cpu(sb->max_dev) | |
1755 | ); | |
1da177e4 LT |
1756 | } |
1757 | ||
cd2ac932 | 1758 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1759 | { |
1760 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
1761 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
1762 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
1763 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1764 | rdev->desc_nr); | |
1da177e4 | 1765 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1766 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1767 | switch (major_version) { | |
1768 | case 0: | |
1769 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1770 | break; | |
1771 | case 1: | |
1772 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1773 | break; | |
1774 | } | |
1da177e4 LT |
1775 | } else |
1776 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1777 | } | |
1778 | ||
5e56341d | 1779 | static void md_print_devices(void) |
1da177e4 | 1780 | { |
159ec1fc | 1781 | struct list_head *tmp; |
1da177e4 LT |
1782 | mdk_rdev_t *rdev; |
1783 | mddev_t *mddev; | |
1784 | char b[BDEVNAME_SIZE]; | |
1785 | ||
1786 | printk("\n"); | |
1787 | printk("md: **********************************\n"); | |
1788 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1789 | printk("md: **********************************\n"); | |
29ac4aa3 | 1790 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1791 | |
32a7627c N |
1792 | if (mddev->bitmap) |
1793 | bitmap_print_sb(mddev->bitmap); | |
1794 | else | |
1795 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 1796 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
1797 | printk("<%s>", bdevname(rdev->bdev,b)); |
1798 | printk("\n"); | |
1799 | ||
159ec1fc | 1800 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 1801 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
1802 | } |
1803 | printk("md: **********************************\n"); | |
1804 | printk("\n"); | |
1805 | } | |
1806 | ||
1807 | ||
42543769 | 1808 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1809 | { |
42543769 N |
1810 | /* Update each superblock (in-memory image), but |
1811 | * if we are allowed to, skip spares which already | |
1812 | * have the right event counter, or have one earlier | |
1813 | * (which would mean they aren't being marked as dirty | |
1814 | * with the rest of the array) | |
1815 | */ | |
1da177e4 | 1816 | mdk_rdev_t *rdev; |
1da177e4 | 1817 | |
159ec1fc | 1818 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
1819 | if (rdev->sb_events == mddev->events || |
1820 | (nospares && | |
1821 | rdev->raid_disk < 0 && | |
1822 | (rdev->sb_events&1)==0 && | |
1823 | rdev->sb_events+1 == mddev->events)) { | |
1824 | /* Don't update this superblock */ | |
1825 | rdev->sb_loaded = 2; | |
1826 | } else { | |
1827 | super_types[mddev->major_version]. | |
1828 | sync_super(mddev, rdev); | |
1829 | rdev->sb_loaded = 1; | |
1830 | } | |
1da177e4 LT |
1831 | } |
1832 | } | |
1833 | ||
850b2b42 | 1834 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1835 | { |
1da177e4 | 1836 | mdk_rdev_t *rdev; |
06d91a5f | 1837 | int sync_req; |
42543769 | 1838 | int nospares = 0; |
1da177e4 | 1839 | |
8377bc80 N |
1840 | if (mddev->external) |
1841 | return; | |
1da177e4 | 1842 | repeat: |
a9701a30 | 1843 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1844 | |
850b2b42 N |
1845 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1846 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1847 | force_change = 1; | |
1848 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1849 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1850 | * though if events isn't the right even/odd, we will have to do | |
1851 | * spares after all | |
1852 | */ | |
1853 | nospares = 1; | |
1854 | if (force_change) | |
1855 | nospares = 0; | |
1856 | if (mddev->degraded) | |
84692195 N |
1857 | /* If the array is degraded, then skipping spares is both |
1858 | * dangerous and fairly pointless. | |
1859 | * Dangerous because a device that was removed from the array | |
1860 | * might have a event_count that still looks up-to-date, | |
1861 | * so it can be re-added without a resync. | |
1862 | * Pointless because if there are any spares to skip, | |
1863 | * then a recovery will happen and soon that array won't | |
1864 | * be degraded any more and the spare can go back to sleep then. | |
1865 | */ | |
850b2b42 | 1866 | nospares = 0; |
84692195 | 1867 | |
06d91a5f | 1868 | sync_req = mddev->in_sync; |
1da177e4 | 1869 | mddev->utime = get_seconds(); |
42543769 N |
1870 | |
1871 | /* If this is just a dirty<->clean transition, and the array is clean | |
1872 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1873 | if (nospares |
42543769 | 1874 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1875 | && (mddev->events & 1) |
1876 | && mddev->events != 1) | |
42543769 N |
1877 | mddev->events--; |
1878 | else { | |
1879 | /* otherwise we have to go forward and ... */ | |
1880 | mddev->events ++; | |
1881 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1882 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1883 | if ((mddev->events&1)==0) { | |
1884 | mddev->events++; | |
1885 | nospares = 0; | |
1886 | } | |
1887 | } else { | |
1888 | /* otherwise insist on an even 'events' (for clean states) */ | |
1889 | if ((mddev->events&1)) { | |
1890 | mddev->events++; | |
1891 | nospares = 0; | |
1892 | } | |
1893 | } | |
1894 | } | |
1da177e4 LT |
1895 | |
1896 | if (!mddev->events) { | |
1897 | /* | |
1898 | * oops, this 64-bit counter should never wrap. | |
1899 | * Either we are in around ~1 trillion A.C., assuming | |
1900 | * 1 reboot per second, or we have a bug: | |
1901 | */ | |
1902 | MD_BUG(); | |
1903 | mddev->events --; | |
1904 | } | |
1da177e4 LT |
1905 | |
1906 | /* | |
1907 | * do not write anything to disk if using | |
1908 | * nonpersistent superblocks | |
1909 | */ | |
06d91a5f | 1910 | if (!mddev->persistent) { |
e691063a N |
1911 | if (!mddev->external) |
1912 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1913 | ||
a9701a30 | 1914 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1915 | wake_up(&mddev->sb_wait); |
1da177e4 | 1916 | return; |
06d91a5f | 1917 | } |
e691063a | 1918 | sync_sbs(mddev, nospares); |
a9701a30 | 1919 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1920 | |
1921 | dprintk(KERN_INFO | |
1922 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1923 | mdname(mddev),mddev->in_sync); | |
1924 | ||
4ad13663 | 1925 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 1926 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
1927 | char b[BDEVNAME_SIZE]; |
1928 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1929 | if (rdev->sb_loaded != 1) |
1930 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1931 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1932 | dprintk("(skipping faulty "); |
1933 | ||
1934 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1935 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1936 | md_super_write(mddev,rdev, |
0f420358 | 1937 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
1938 | rdev->sb_page); |
1939 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1940 | bdevname(rdev->bdev,b), | |
0f420358 | 1941 | (unsigned long long)rdev->sb_start); |
42543769 | 1942 | rdev->sb_events = mddev->events; |
7bfa19f2 | 1943 | |
1da177e4 LT |
1944 | } else |
1945 | dprintk(")\n"); | |
7bfa19f2 | 1946 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1947 | /* only need to write one superblock... */ |
1948 | break; | |
1949 | } | |
a9701a30 | 1950 | md_super_wait(mddev); |
850b2b42 | 1951 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 1952 | |
a9701a30 | 1953 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
1954 | if (mddev->in_sync != sync_req || |
1955 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 1956 | /* have to write it out again */ |
a9701a30 | 1957 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1958 | goto repeat; |
1959 | } | |
850b2b42 | 1960 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 1961 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1962 | wake_up(&mddev->sb_wait); |
06d91a5f | 1963 | |
1da177e4 LT |
1964 | } |
1965 | ||
7f6ce769 | 1966 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
1967 | * We want to accept with case. For this we use cmd_match. |
1968 | */ | |
1969 | static int cmd_match(const char *cmd, const char *str) | |
1970 | { | |
1971 | /* See if cmd, written into a sysfs file, matches | |
1972 | * str. They must either be the same, or cmd can | |
1973 | * have a trailing newline | |
1974 | */ | |
1975 | while (*cmd && *str && *cmd == *str) { | |
1976 | cmd++; | |
1977 | str++; | |
1978 | } | |
1979 | if (*cmd == '\n') | |
1980 | cmd++; | |
1981 | if (*str || *cmd) | |
1982 | return 0; | |
1983 | return 1; | |
1984 | } | |
1985 | ||
86e6ffdd N |
1986 | struct rdev_sysfs_entry { |
1987 | struct attribute attr; | |
1988 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1989 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1990 | }; | |
1991 | ||
1992 | static ssize_t | |
96de1e66 | 1993 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1994 | { |
1995 | char *sep = ""; | |
20a49ff6 | 1996 | size_t len = 0; |
86e6ffdd | 1997 | |
b2d444d7 | 1998 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1999 | len+= sprintf(page+len, "%sfaulty",sep); |
2000 | sep = ","; | |
2001 | } | |
b2d444d7 | 2002 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2003 | len += sprintf(page+len, "%sin_sync",sep); |
2004 | sep = ","; | |
2005 | } | |
f655675b N |
2006 | if (test_bit(WriteMostly, &rdev->flags)) { |
2007 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2008 | sep = ","; | |
2009 | } | |
6bfe0b49 DW |
2010 | if (test_bit(Blocked, &rdev->flags)) { |
2011 | len += sprintf(page+len, "%sblocked", sep); | |
2012 | sep = ","; | |
2013 | } | |
b2d444d7 N |
2014 | if (!test_bit(Faulty, &rdev->flags) && |
2015 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2016 | len += sprintf(page+len, "%sspare", sep); |
2017 | sep = ","; | |
2018 | } | |
2019 | return len+sprintf(page+len, "\n"); | |
2020 | } | |
2021 | ||
45dc2de1 N |
2022 | static ssize_t |
2023 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2024 | { | |
2025 | /* can write | |
2026 | * faulty - simulates and error | |
2027 | * remove - disconnects the device | |
f655675b N |
2028 | * writemostly - sets write_mostly |
2029 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2030 | * blocked - sets the Blocked flag |
2031 | * -blocked - clears the Blocked flag | |
45dc2de1 N |
2032 | */ |
2033 | int err = -EINVAL; | |
2034 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2035 | md_error(rdev->mddev, rdev); | |
2036 | err = 0; | |
2037 | } else if (cmd_match(buf, "remove")) { | |
2038 | if (rdev->raid_disk >= 0) | |
2039 | err = -EBUSY; | |
2040 | else { | |
2041 | mddev_t *mddev = rdev->mddev; | |
2042 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2043 | if (mddev->pers) |
2044 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2045 | md_new_event(mddev); |
2046 | err = 0; | |
2047 | } | |
f655675b N |
2048 | } else if (cmd_match(buf, "writemostly")) { |
2049 | set_bit(WriteMostly, &rdev->flags); | |
2050 | err = 0; | |
2051 | } else if (cmd_match(buf, "-writemostly")) { | |
2052 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2053 | err = 0; |
2054 | } else if (cmd_match(buf, "blocked")) { | |
2055 | set_bit(Blocked, &rdev->flags); | |
2056 | err = 0; | |
2057 | } else if (cmd_match(buf, "-blocked")) { | |
2058 | clear_bit(Blocked, &rdev->flags); | |
2059 | wake_up(&rdev->blocked_wait); | |
2060 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2061 | md_wakeup_thread(rdev->mddev->thread); | |
2062 | ||
f655675b | 2063 | err = 0; |
45dc2de1 | 2064 | } |
3c0ee63a N |
2065 | if (!err && rdev->sysfs_state) |
2066 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
2067 | return err ? err : len; |
2068 | } | |
80ca3a44 N |
2069 | static struct rdev_sysfs_entry rdev_state = |
2070 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2071 | |
4dbcdc75 N |
2072 | static ssize_t |
2073 | errors_show(mdk_rdev_t *rdev, char *page) | |
2074 | { | |
2075 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2076 | } | |
2077 | ||
2078 | static ssize_t | |
2079 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2080 | { | |
2081 | char *e; | |
2082 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2083 | if (*buf && (*e == 0 || *e == '\n')) { | |
2084 | atomic_set(&rdev->corrected_errors, n); | |
2085 | return len; | |
2086 | } | |
2087 | return -EINVAL; | |
2088 | } | |
2089 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2090 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2091 | |
014236d2 N |
2092 | static ssize_t |
2093 | slot_show(mdk_rdev_t *rdev, char *page) | |
2094 | { | |
2095 | if (rdev->raid_disk < 0) | |
2096 | return sprintf(page, "none\n"); | |
2097 | else | |
2098 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2099 | } | |
2100 | ||
2101 | static ssize_t | |
2102 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2103 | { | |
2104 | char *e; | |
c303da6d N |
2105 | int err; |
2106 | char nm[20]; | |
014236d2 N |
2107 | int slot = simple_strtoul(buf, &e, 10); |
2108 | if (strncmp(buf, "none", 4)==0) | |
2109 | slot = -1; | |
2110 | else if (e==buf || (*e && *e!= '\n')) | |
2111 | return -EINVAL; | |
6c2fce2e | 2112 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2113 | /* Setting 'slot' on an active array requires also |
2114 | * updating the 'rd%d' link, and communicating | |
2115 | * with the personality with ->hot_*_disk. | |
2116 | * For now we only support removing | |
2117 | * failed/spare devices. This normally happens automatically, | |
2118 | * but not when the metadata is externally managed. | |
2119 | */ | |
c303da6d N |
2120 | if (rdev->raid_disk == -1) |
2121 | return -EEXIST; | |
2122 | /* personality does all needed checks */ | |
2123 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2124 | return -EINVAL; | |
2125 | err = rdev->mddev->pers-> | |
2126 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2127 | if (err) | |
2128 | return err; | |
2129 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2130 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2131 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2132 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2133 | } else if (rdev->mddev->pers) { |
2134 | mdk_rdev_t *rdev2; | |
6c2fce2e NB |
2135 | /* Activating a spare .. or possibly reactivating |
2136 | * if we every get bitmaps working here. | |
2137 | */ | |
2138 | ||
2139 | if (rdev->raid_disk != -1) | |
2140 | return -EBUSY; | |
2141 | ||
2142 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2143 | return -EINVAL; | |
2144 | ||
159ec1fc | 2145 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2146 | if (rdev2->raid_disk == slot) |
2147 | return -EEXIST; | |
2148 | ||
2149 | rdev->raid_disk = slot; | |
2150 | if (test_bit(In_sync, &rdev->flags)) | |
2151 | rdev->saved_raid_disk = slot; | |
2152 | else | |
2153 | rdev->saved_raid_disk = -1; | |
2154 | err = rdev->mddev->pers-> | |
2155 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2156 | if (err) { |
6c2fce2e | 2157 | rdev->raid_disk = -1; |
6c2fce2e | 2158 | return err; |
52664732 | 2159 | } else |
3c0ee63a | 2160 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2161 | sprintf(nm, "rd%d", rdev->raid_disk); |
2162 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2163 | printk(KERN_WARNING | |
2164 | "md: cannot register " | |
2165 | "%s for %s\n", | |
2166 | nm, mdname(rdev->mddev)); | |
2167 | ||
2168 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2169 | } else { |
2170 | if (slot >= rdev->mddev->raid_disks) | |
2171 | return -ENOSPC; | |
2172 | rdev->raid_disk = slot; | |
2173 | /* assume it is working */ | |
c5d79adb N |
2174 | clear_bit(Faulty, &rdev->flags); |
2175 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2176 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2177 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2178 | } |
014236d2 N |
2179 | return len; |
2180 | } | |
2181 | ||
2182 | ||
2183 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2184 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2185 | |
93c8cad0 N |
2186 | static ssize_t |
2187 | offset_show(mdk_rdev_t *rdev, char *page) | |
2188 | { | |
6961ece4 | 2189 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2190 | } |
2191 | ||
2192 | static ssize_t | |
2193 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2194 | { | |
2195 | char *e; | |
2196 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2197 | if (e==buf || (*e && *e != '\n')) | |
2198 | return -EINVAL; | |
8ed0a521 | 2199 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2200 | return -EBUSY; |
dd8ac336 | 2201 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2202 | /* Must set offset before size, so overlap checks |
2203 | * can be sane */ | |
2204 | return -EBUSY; | |
93c8cad0 N |
2205 | rdev->data_offset = offset; |
2206 | return len; | |
2207 | } | |
2208 | ||
2209 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2210 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2211 | |
83303b61 N |
2212 | static ssize_t |
2213 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2214 | { | |
dd8ac336 | 2215 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2216 | } |
2217 | ||
c5d79adb N |
2218 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2219 | { | |
2220 | /* check if two start/length pairs overlap */ | |
2221 | if (s1+l1 <= s2) | |
2222 | return 0; | |
2223 | if (s2+l2 <= s1) | |
2224 | return 0; | |
2225 | return 1; | |
2226 | } | |
2227 | ||
83303b61 N |
2228 | static ssize_t |
2229 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2230 | { | |
27c529bb | 2231 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 AN |
2232 | sector_t oldsectors = rdev->sectors; |
2233 | unsigned long long sectors; | |
27c529bb | 2234 | |
dd8ac336 | 2235 | if (strict_strtoull(buf, 10, §ors) < 0) |
d7027458 | 2236 | return -EINVAL; |
dd8ac336 | 2237 | sectors *= 2; |
0cd17fec | 2238 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2239 | if (my_mddev->persistent) { |
dd8ac336 AN |
2240 | sectors = super_types[my_mddev->major_version]. |
2241 | rdev_size_change(rdev, sectors); | |
2242 | if (!sectors) | |
0cd17fec | 2243 | return -EBUSY; |
dd8ac336 AN |
2244 | } else if (!sectors) |
2245 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2246 | rdev->data_offset; | |
0cd17fec | 2247 | } |
dd8ac336 | 2248 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2249 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2250 | |
dd8ac336 AN |
2251 | rdev->sectors = sectors; |
2252 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2253 | /* need to check that all other rdevs with the same ->bdev |
2254 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2255 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2256 | * we have to change it back, we will have the lock again. |
2257 | */ | |
2258 | mddev_t *mddev; | |
2259 | int overlap = 0; | |
159ec1fc | 2260 | struct list_head *tmp; |
c5d79adb | 2261 | |
27c529bb | 2262 | mddev_unlock(my_mddev); |
29ac4aa3 | 2263 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2264 | mdk_rdev_t *rdev2; |
2265 | ||
2266 | mddev_lock(mddev); | |
159ec1fc | 2267 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2268 | if (test_bit(AllReserved, &rdev2->flags) || |
2269 | (rdev->bdev == rdev2->bdev && | |
2270 | rdev != rdev2 && | |
dd8ac336 | 2271 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2272 | rdev2->data_offset, |
dd8ac336 | 2273 | rdev2->sectors))) { |
c5d79adb N |
2274 | overlap = 1; |
2275 | break; | |
2276 | } | |
2277 | mddev_unlock(mddev); | |
2278 | if (overlap) { | |
2279 | mddev_put(mddev); | |
2280 | break; | |
2281 | } | |
2282 | } | |
27c529bb | 2283 | mddev_lock(my_mddev); |
c5d79adb N |
2284 | if (overlap) { |
2285 | /* Someone else could have slipped in a size | |
2286 | * change here, but doing so is just silly. | |
dd8ac336 | 2287 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2288 | * safe, and trust userspace not to race with |
2289 | * itself | |
2290 | */ | |
dd8ac336 | 2291 | rdev->sectors = oldsectors; |
c5d79adb N |
2292 | return -EBUSY; |
2293 | } | |
2294 | } | |
83303b61 N |
2295 | return len; |
2296 | } | |
2297 | ||
2298 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2299 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2300 | |
86e6ffdd N |
2301 | static struct attribute *rdev_default_attrs[] = { |
2302 | &rdev_state.attr, | |
4dbcdc75 | 2303 | &rdev_errors.attr, |
014236d2 | 2304 | &rdev_slot.attr, |
93c8cad0 | 2305 | &rdev_offset.attr, |
83303b61 | 2306 | &rdev_size.attr, |
86e6ffdd N |
2307 | NULL, |
2308 | }; | |
2309 | static ssize_t | |
2310 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2311 | { | |
2312 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2313 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2314 | mddev_t *mddev = rdev->mddev; |
2315 | ssize_t rv; | |
86e6ffdd N |
2316 | |
2317 | if (!entry->show) | |
2318 | return -EIO; | |
27c529bb N |
2319 | |
2320 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2321 | if (!rv) { | |
2322 | if (rdev->mddev == NULL) | |
2323 | rv = -EBUSY; | |
2324 | else | |
2325 | rv = entry->show(rdev, page); | |
2326 | mddev_unlock(mddev); | |
2327 | } | |
2328 | return rv; | |
86e6ffdd N |
2329 | } |
2330 | ||
2331 | static ssize_t | |
2332 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2333 | const char *page, size_t length) | |
2334 | { | |
2335 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2336 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2337 | ssize_t rv; |
2338 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2339 | |
2340 | if (!entry->store) | |
2341 | return -EIO; | |
67463acb N |
2342 | if (!capable(CAP_SYS_ADMIN)) |
2343 | return -EACCES; | |
27c529bb | 2344 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2345 | if (!rv) { |
27c529bb N |
2346 | if (rdev->mddev == NULL) |
2347 | rv = -EBUSY; | |
2348 | else | |
2349 | rv = entry->store(rdev, page, length); | |
6a51830e | 2350 | mddev_unlock(mddev); |
ca388059 N |
2351 | } |
2352 | return rv; | |
86e6ffdd N |
2353 | } |
2354 | ||
2355 | static void rdev_free(struct kobject *ko) | |
2356 | { | |
2357 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2358 | kfree(rdev); | |
2359 | } | |
2360 | static struct sysfs_ops rdev_sysfs_ops = { | |
2361 | .show = rdev_attr_show, | |
2362 | .store = rdev_attr_store, | |
2363 | }; | |
2364 | static struct kobj_type rdev_ktype = { | |
2365 | .release = rdev_free, | |
2366 | .sysfs_ops = &rdev_sysfs_ops, | |
2367 | .default_attrs = rdev_default_attrs, | |
2368 | }; | |
2369 | ||
1da177e4 LT |
2370 | /* |
2371 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2372 | * | |
2373 | * mark the device faulty if: | |
2374 | * | |
2375 | * - the device is nonexistent (zero size) | |
2376 | * - the device has no valid superblock | |
2377 | * | |
2378 | * a faulty rdev _never_ has rdev->sb set. | |
2379 | */ | |
2380 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2381 | { | |
2382 | char b[BDEVNAME_SIZE]; | |
2383 | int err; | |
2384 | mdk_rdev_t *rdev; | |
2385 | sector_t size; | |
2386 | ||
9ffae0cf | 2387 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2388 | if (!rdev) { |
2389 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2390 | return ERR_PTR(-ENOMEM); | |
2391 | } | |
1da177e4 LT |
2392 | |
2393 | if ((err = alloc_disk_sb(rdev))) | |
2394 | goto abort_free; | |
2395 | ||
c5d79adb | 2396 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2397 | if (err) |
2398 | goto abort_free; | |
2399 | ||
f9cb074b | 2400 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2401 | |
1da177e4 | 2402 | rdev->desc_nr = -1; |
2b6e8459 | 2403 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2404 | rdev->raid_disk = -1; |
b2d444d7 | 2405 | rdev->flags = 0; |
1da177e4 | 2406 | rdev->data_offset = 0; |
42543769 | 2407 | rdev->sb_events = 0; |
1da177e4 | 2408 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2409 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2410 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2411 | |
2412 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2413 | if (!size) { | |
2414 | printk(KERN_WARNING | |
2415 | "md: %s has zero or unknown size, marking faulty!\n", | |
2416 | bdevname(rdev->bdev,b)); | |
2417 | err = -EINVAL; | |
2418 | goto abort_free; | |
2419 | } | |
2420 | ||
2421 | if (super_format >= 0) { | |
2422 | err = super_types[super_format]. | |
2423 | load_super(rdev, NULL, super_minor); | |
2424 | if (err == -EINVAL) { | |
df968c4e N |
2425 | printk(KERN_WARNING |
2426 | "md: %s does not have a valid v%d.%d " | |
2427 | "superblock, not importing!\n", | |
2428 | bdevname(rdev->bdev,b), | |
2429 | super_format, super_minor); | |
1da177e4 LT |
2430 | goto abort_free; |
2431 | } | |
2432 | if (err < 0) { | |
2433 | printk(KERN_WARNING | |
2434 | "md: could not read %s's sb, not importing!\n", | |
2435 | bdevname(rdev->bdev,b)); | |
2436 | goto abort_free; | |
2437 | } | |
2438 | } | |
6bfe0b49 | 2439 | |
1da177e4 | 2440 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2441 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2442 | |
2443 | return rdev; | |
2444 | ||
2445 | abort_free: | |
2446 | if (rdev->sb_page) { | |
2447 | if (rdev->bdev) | |
2448 | unlock_rdev(rdev); | |
2449 | free_disk_sb(rdev); | |
2450 | } | |
2451 | kfree(rdev); | |
2452 | return ERR_PTR(err); | |
2453 | } | |
2454 | ||
2455 | /* | |
2456 | * Check a full RAID array for plausibility | |
2457 | */ | |
2458 | ||
2459 | ||
a757e64c | 2460 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2461 | { |
2462 | int i; | |
159ec1fc | 2463 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2464 | char b[BDEVNAME_SIZE]; |
2465 | ||
2466 | freshest = NULL; | |
d089c6af | 2467 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2468 | switch (super_types[mddev->major_version]. |
2469 | load_super(rdev, freshest, mddev->minor_version)) { | |
2470 | case 1: | |
2471 | freshest = rdev; | |
2472 | break; | |
2473 | case 0: | |
2474 | break; | |
2475 | default: | |
2476 | printk( KERN_ERR \ | |
2477 | "md: fatal superblock inconsistency in %s" | |
2478 | " -- removing from array\n", | |
2479 | bdevname(rdev->bdev,b)); | |
2480 | kick_rdev_from_array(rdev); | |
2481 | } | |
2482 | ||
2483 | ||
2484 | super_types[mddev->major_version]. | |
2485 | validate_super(mddev, freshest); | |
2486 | ||
2487 | i = 0; | |
d089c6af | 2488 | rdev_for_each(rdev, tmp, mddev) { |
de01dfad N |
2489 | if (rdev->desc_nr >= mddev->max_disks || |
2490 | i > mddev->max_disks) { | |
2491 | printk(KERN_WARNING | |
2492 | "md: %s: %s: only %d devices permitted\n", | |
2493 | mdname(mddev), bdevname(rdev->bdev, b), | |
2494 | mddev->max_disks); | |
2495 | kick_rdev_from_array(rdev); | |
2496 | continue; | |
2497 | } | |
1da177e4 LT |
2498 | if (rdev != freshest) |
2499 | if (super_types[mddev->major_version]. | |
2500 | validate_super(mddev, rdev)) { | |
2501 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2502 | " from array!\n", | |
2503 | bdevname(rdev->bdev,b)); | |
2504 | kick_rdev_from_array(rdev); | |
2505 | continue; | |
2506 | } | |
2507 | if (mddev->level == LEVEL_MULTIPATH) { | |
2508 | rdev->desc_nr = i++; | |
2509 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2510 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2511 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2512 | rdev->raid_disk = -1; | |
2513 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2514 | } |
2515 | } | |
2516 | ||
2517 | ||
2518 | ||
2519 | if (mddev->recovery_cp != MaxSector && | |
2520 | mddev->level >= 1) | |
2521 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2522 | " -- starting background reconstruction\n", | |
2523 | mdname(mddev)); | |
2524 | ||
1da177e4 LT |
2525 | } |
2526 | ||
19052c0e N |
2527 | static void md_safemode_timeout(unsigned long data); |
2528 | ||
16f17b39 N |
2529 | static ssize_t |
2530 | safe_delay_show(mddev_t *mddev, char *page) | |
2531 | { | |
2532 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2533 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2534 | } | |
2535 | static ssize_t | |
2536 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2537 | { | |
2538 | int scale=1; | |
2539 | int dot=0; | |
2540 | int i; | |
2541 | unsigned long msec; | |
2542 | char buf[30]; | |
97ce0a7f | 2543 | |
16f17b39 N |
2544 | /* remove a period, and count digits after it */ |
2545 | if (len >= sizeof(buf)) | |
2546 | return -EINVAL; | |
97ce0a7f | 2547 | strlcpy(buf, cbuf, sizeof(buf)); |
16f17b39 N |
2548 | for (i=0; i<len; i++) { |
2549 | if (dot) { | |
2550 | if (isdigit(buf[i])) { | |
2551 | buf[i-1] = buf[i]; | |
2552 | scale *= 10; | |
2553 | } | |
2554 | buf[i] = 0; | |
2555 | } else if (buf[i] == '.') { | |
2556 | dot=1; | |
2557 | buf[i] = 0; | |
2558 | } | |
2559 | } | |
97ce0a7f | 2560 | if (strict_strtoul(buf, 10, &msec) < 0) |
16f17b39 N |
2561 | return -EINVAL; |
2562 | msec = (msec * 1000) / scale; | |
2563 | if (msec == 0) | |
2564 | mddev->safemode_delay = 0; | |
2565 | else { | |
19052c0e | 2566 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2567 | mddev->safemode_delay = (msec*HZ)/1000; |
2568 | if (mddev->safemode_delay == 0) | |
2569 | mddev->safemode_delay = 1; | |
19052c0e N |
2570 | if (mddev->safemode_delay < old_delay) |
2571 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2572 | } |
2573 | return len; | |
2574 | } | |
2575 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2576 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2577 | |
eae1701f | 2578 | static ssize_t |
96de1e66 | 2579 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2580 | { |
2604b703 | 2581 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2582 | if (p) |
eae1701f | 2583 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2584 | else if (mddev->clevel[0]) |
2585 | return sprintf(page, "%s\n", mddev->clevel); | |
2586 | else if (mddev->level != LEVEL_NONE) | |
2587 | return sprintf(page, "%d\n", mddev->level); | |
2588 | else | |
2589 | return 0; | |
eae1701f N |
2590 | } |
2591 | ||
d9d166c2 N |
2592 | static ssize_t |
2593 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2594 | { | |
20a49ff6 | 2595 | ssize_t rv = len; |
d9d166c2 N |
2596 | if (mddev->pers) |
2597 | return -EBUSY; | |
2598 | if (len == 0) | |
2599 | return 0; | |
2600 | if (len >= sizeof(mddev->clevel)) | |
2601 | return -ENOSPC; | |
2602 | strncpy(mddev->clevel, buf, len); | |
2603 | if (mddev->clevel[len-1] == '\n') | |
2604 | len--; | |
2605 | mddev->clevel[len] = 0; | |
2606 | mddev->level = LEVEL_NONE; | |
2607 | return rv; | |
2608 | } | |
2609 | ||
2610 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2611 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2612 | |
d4dbd025 N |
2613 | |
2614 | static ssize_t | |
2615 | layout_show(mddev_t *mddev, char *page) | |
2616 | { | |
2617 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2618 | if (mddev->reshape_position != MaxSector && |
2619 | mddev->layout != mddev->new_layout) | |
2620 | return sprintf(page, "%d (%d)\n", | |
2621 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2622 | return sprintf(page, "%d\n", mddev->layout); |
2623 | } | |
2624 | ||
2625 | static ssize_t | |
2626 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2627 | { | |
2628 | char *e; | |
2629 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2630 | |
2631 | if (!*buf || (*e && *e != '\n')) | |
2632 | return -EINVAL; | |
2633 | ||
08a02ecd N |
2634 | if (mddev->pers) |
2635 | return -EBUSY; | |
34817e8c N |
2636 | |
2637 | mddev->new_layout = n; | |
2638 | if (mddev->reshape_position == MaxSector) | |
08a02ecd | 2639 | mddev->layout = n; |
d4dbd025 N |
2640 | return len; |
2641 | } | |
2642 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2643 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2644 | |
2645 | ||
eae1701f | 2646 | static ssize_t |
96de1e66 | 2647 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2648 | { |
bb636547 N |
2649 | if (mddev->raid_disks == 0) |
2650 | return 0; | |
08a02ecd N |
2651 | if (mddev->reshape_position != MaxSector && |
2652 | mddev->delta_disks != 0) | |
2653 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2654 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2655 | return sprintf(page, "%d\n", mddev->raid_disks); |
2656 | } | |
2657 | ||
da943b99 N |
2658 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2659 | ||
2660 | static ssize_t | |
2661 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2662 | { | |
da943b99 N |
2663 | char *e; |
2664 | int rv = 0; | |
2665 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2666 | ||
2667 | if (!*buf || (*e && *e != '\n')) | |
2668 | return -EINVAL; | |
2669 | ||
2670 | if (mddev->pers) | |
2671 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2672 | else if (mddev->reshape_position != MaxSector) { |
2673 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2674 | mddev->delta_disks = n - olddisks; | |
2675 | mddev->raid_disks = n; | |
2676 | } else | |
da943b99 N |
2677 | mddev->raid_disks = n; |
2678 | return rv ? rv : len; | |
2679 | } | |
2680 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2681 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2682 | |
3b34380a N |
2683 | static ssize_t |
2684 | chunk_size_show(mddev_t *mddev, char *page) | |
2685 | { | |
08a02ecd N |
2686 | if (mddev->reshape_position != MaxSector && |
2687 | mddev->chunk_size != mddev->new_chunk) | |
2688 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2689 | mddev->chunk_size); | |
3b34380a N |
2690 | return sprintf(page, "%d\n", mddev->chunk_size); |
2691 | } | |
2692 | ||
2693 | static ssize_t | |
2694 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2695 | { | |
2696 | /* can only set chunk_size if array is not yet active */ | |
2697 | char *e; | |
2698 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2699 | ||
3b34380a N |
2700 | if (!*buf || (*e && *e != '\n')) |
2701 | return -EINVAL; | |
2702 | ||
08a02ecd N |
2703 | if (mddev->pers) |
2704 | return -EBUSY; | |
34817e8c N |
2705 | |
2706 | mddev->new_chunk = n; | |
2707 | if (mddev->reshape_position == MaxSector) | |
08a02ecd | 2708 | mddev->chunk_size = n; |
3b34380a N |
2709 | return len; |
2710 | } | |
2711 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2712 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2713 | |
a94213b1 N |
2714 | static ssize_t |
2715 | resync_start_show(mddev_t *mddev, char *page) | |
2716 | { | |
2717 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2718 | } | |
2719 | ||
2720 | static ssize_t | |
2721 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2722 | { | |
a94213b1 N |
2723 | char *e; |
2724 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2725 | ||
2726 | if (mddev->pers) | |
2727 | return -EBUSY; | |
2728 | if (!*buf || (*e && *e != '\n')) | |
2729 | return -EINVAL; | |
2730 | ||
2731 | mddev->recovery_cp = n; | |
2732 | return len; | |
2733 | } | |
2734 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2735 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2736 | |
9e653b63 N |
2737 | /* |
2738 | * The array state can be: | |
2739 | * | |
2740 | * clear | |
2741 | * No devices, no size, no level | |
2742 | * Equivalent to STOP_ARRAY ioctl | |
2743 | * inactive | |
2744 | * May have some settings, but array is not active | |
2745 | * all IO results in error | |
2746 | * When written, doesn't tear down array, but just stops it | |
2747 | * suspended (not supported yet) | |
2748 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2749 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2750 | * readonly |
2751 | * no resync can happen. no superblocks get written. | |
2752 | * write requests fail | |
2753 | * read-auto | |
2754 | * like readonly, but behaves like 'clean' on a write request. | |
2755 | * | |
2756 | * clean - no pending writes, but otherwise active. | |
2757 | * When written to inactive array, starts without resync | |
2758 | * If a write request arrives then | |
2759 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2760 | * if not known, block and switch to write-pending | |
2761 | * If written to an active array that has pending writes, then fails. | |
2762 | * active | |
2763 | * fully active: IO and resync can be happening. | |
2764 | * When written to inactive array, starts with resync | |
2765 | * | |
2766 | * write-pending | |
2767 | * clean, but writes are blocked waiting for 'active' to be written. | |
2768 | * | |
2769 | * active-idle | |
2770 | * like active, but no writes have been seen for a while (100msec). | |
2771 | * | |
2772 | */ | |
2773 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2774 | write_pending, active_idle, bad_word}; | |
05381954 | 2775 | static char *array_states[] = { |
9e653b63 N |
2776 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2777 | "write-pending", "active-idle", NULL }; | |
2778 | ||
2779 | static int match_word(const char *word, char **list) | |
2780 | { | |
2781 | int n; | |
2782 | for (n=0; list[n]; n++) | |
2783 | if (cmd_match(word, list[n])) | |
2784 | break; | |
2785 | return n; | |
2786 | } | |
2787 | ||
2788 | static ssize_t | |
2789 | array_state_show(mddev_t *mddev, char *page) | |
2790 | { | |
2791 | enum array_state st = inactive; | |
2792 | ||
2793 | if (mddev->pers) | |
2794 | switch(mddev->ro) { | |
2795 | case 1: | |
2796 | st = readonly; | |
2797 | break; | |
2798 | case 2: | |
2799 | st = read_auto; | |
2800 | break; | |
2801 | case 0: | |
2802 | if (mddev->in_sync) | |
2803 | st = clean; | |
e691063a N |
2804 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2805 | st = write_pending; | |
9e653b63 N |
2806 | else if (mddev->safemode) |
2807 | st = active_idle; | |
2808 | else | |
2809 | st = active; | |
2810 | } | |
2811 | else { | |
2812 | if (list_empty(&mddev->disks) && | |
2813 | mddev->raid_disks == 0 && | |
58c0fed4 | 2814 | mddev->dev_sectors == 0) |
9e653b63 N |
2815 | st = clear; |
2816 | else | |
2817 | st = inactive; | |
2818 | } | |
2819 | return sprintf(page, "%s\n", array_states[st]); | |
2820 | } | |
2821 | ||
df5b20cf | 2822 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
2823 | static int do_md_run(mddev_t * mddev); |
2824 | static int restart_array(mddev_t *mddev); | |
2825 | ||
2826 | static ssize_t | |
2827 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
2828 | { | |
2829 | int err = -EINVAL; | |
2830 | enum array_state st = match_word(buf, array_states); | |
2831 | switch(st) { | |
2832 | case bad_word: | |
2833 | break; | |
2834 | case clear: | |
2835 | /* stopping an active array */ | |
f2ea68cf | 2836 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 2837 | return -EBUSY; |
df5b20cf | 2838 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
2839 | break; |
2840 | case inactive: | |
2841 | /* stopping an active array */ | |
2842 | if (mddev->pers) { | |
f2ea68cf | 2843 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 2844 | return -EBUSY; |
df5b20cf | 2845 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
2846 | } else |
2847 | err = 0; /* already inactive */ | |
9e653b63 N |
2848 | break; |
2849 | case suspended: | |
2850 | break; /* not supported yet */ | |
2851 | case readonly: | |
2852 | if (mddev->pers) | |
df5b20cf | 2853 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
2854 | else { |
2855 | mddev->ro = 1; | |
648b629e | 2856 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
2857 | err = do_md_run(mddev); |
2858 | } | |
2859 | break; | |
2860 | case read_auto: | |
9e653b63 | 2861 | if (mddev->pers) { |
80268ee9 | 2862 | if (mddev->ro == 0) |
df5b20cf | 2863 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 2864 | else if (mddev->ro == 1) |
648b629e N |
2865 | err = restart_array(mddev); |
2866 | if (err == 0) { | |
2867 | mddev->ro = 2; | |
2868 | set_disk_ro(mddev->gendisk, 0); | |
2869 | } | |
9e653b63 N |
2870 | } else { |
2871 | mddev->ro = 2; | |
2872 | err = do_md_run(mddev); | |
2873 | } | |
2874 | break; | |
2875 | case clean: | |
2876 | if (mddev->pers) { | |
2877 | restart_array(mddev); | |
2878 | spin_lock_irq(&mddev->write_lock); | |
2879 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
2880 | if (mddev->in_sync == 0) { |
2881 | mddev->in_sync = 1; | |
31a59e34 N |
2882 | if (mddev->safemode == 1) |
2883 | mddev->safemode = 0; | |
e691063a N |
2884 | if (mddev->persistent) |
2885 | set_bit(MD_CHANGE_CLEAN, | |
2886 | &mddev->flags); | |
2887 | } | |
2888 | err = 0; | |
2889 | } else | |
2890 | err = -EBUSY; | |
9e653b63 N |
2891 | spin_unlock_irq(&mddev->write_lock); |
2892 | } else { | |
2893 | mddev->ro = 0; | |
2894 | mddev->recovery_cp = MaxSector; | |
2895 | err = do_md_run(mddev); | |
2896 | } | |
2897 | break; | |
2898 | case active: | |
2899 | if (mddev->pers) { | |
2900 | restart_array(mddev); | |
e691063a N |
2901 | if (mddev->external) |
2902 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
2903 | wake_up(&mddev->sb_wait); |
2904 | err = 0; | |
2905 | } else { | |
2906 | mddev->ro = 0; | |
648b629e | 2907 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
2908 | err = do_md_run(mddev); |
2909 | } | |
2910 | break; | |
2911 | case write_pending: | |
2912 | case active_idle: | |
2913 | /* these cannot be set */ | |
2914 | break; | |
2915 | } | |
2916 | if (err) | |
2917 | return err; | |
0fd62b86 | 2918 | else { |
b62b7590 | 2919 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 2920 | return len; |
0fd62b86 | 2921 | } |
9e653b63 | 2922 | } |
80ca3a44 N |
2923 | static struct md_sysfs_entry md_array_state = |
2924 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 2925 | |
6d7ff738 N |
2926 | static ssize_t |
2927 | null_show(mddev_t *mddev, char *page) | |
2928 | { | |
2929 | return -EINVAL; | |
2930 | } | |
2931 | ||
2932 | static ssize_t | |
2933 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2934 | { | |
2935 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2936 | /* The new device is added to the array. | |
2937 | * If the array has a persistent superblock, we read the | |
2938 | * superblock to initialise info and check validity. | |
2939 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2940 | * which mainly checks size. | |
2941 | */ | |
2942 | char *e; | |
2943 | int major = simple_strtoul(buf, &e, 10); | |
2944 | int minor; | |
2945 | dev_t dev; | |
2946 | mdk_rdev_t *rdev; | |
2947 | int err; | |
2948 | ||
2949 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2950 | return -EINVAL; | |
2951 | minor = simple_strtoul(e+1, &e, 10); | |
2952 | if (*e && *e != '\n') | |
2953 | return -EINVAL; | |
2954 | dev = MKDEV(major, minor); | |
2955 | if (major != MAJOR(dev) || | |
2956 | minor != MINOR(dev)) | |
2957 | return -EOVERFLOW; | |
2958 | ||
2959 | ||
2960 | if (mddev->persistent) { | |
2961 | rdev = md_import_device(dev, mddev->major_version, | |
2962 | mddev->minor_version); | |
2963 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2964 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2965 | mdk_rdev_t, same_set); | |
2966 | err = super_types[mddev->major_version] | |
2967 | .load_super(rdev, rdev0, mddev->minor_version); | |
2968 | if (err < 0) | |
2969 | goto out; | |
2970 | } | |
c5d79adb N |
2971 | } else if (mddev->external) |
2972 | rdev = md_import_device(dev, -2, -1); | |
2973 | else | |
6d7ff738 N |
2974 | rdev = md_import_device(dev, -1, -1); |
2975 | ||
2976 | if (IS_ERR(rdev)) | |
2977 | return PTR_ERR(rdev); | |
2978 | err = bind_rdev_to_array(rdev, mddev); | |
2979 | out: | |
2980 | if (err) | |
2981 | export_rdev(rdev); | |
2982 | return err ? err : len; | |
2983 | } | |
2984 | ||
2985 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 2986 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 2987 | |
9b1d1dac PC |
2988 | static ssize_t |
2989 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
2990 | { | |
2991 | char *end; | |
2992 | unsigned long chunk, end_chunk; | |
2993 | ||
2994 | if (!mddev->bitmap) | |
2995 | goto out; | |
2996 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
2997 | while (*buf) { | |
2998 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
2999 | if (buf == end) break; | |
3000 | if (*end == '-') { /* range */ | |
3001 | buf = end + 1; | |
3002 | end_chunk = simple_strtoul(buf, &end, 0); | |
3003 | if (buf == end) break; | |
3004 | } | |
3005 | if (*end && !isspace(*end)) break; | |
3006 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
3007 | buf = end; | |
3008 | while (isspace(*buf)) buf++; | |
3009 | } | |
3010 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3011 | out: | |
3012 | return len; | |
3013 | } | |
3014 | ||
3015 | static struct md_sysfs_entry md_bitmap = | |
3016 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3017 | ||
a35b0d69 N |
3018 | static ssize_t |
3019 | size_show(mddev_t *mddev, char *page) | |
3020 | { | |
58c0fed4 AN |
3021 | return sprintf(page, "%llu\n", |
3022 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3023 | } |
3024 | ||
d71f9f88 | 3025 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3026 | |
3027 | static ssize_t | |
3028 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3029 | { | |
3030 | /* If array is inactive, we can reduce the component size, but | |
3031 | * not increase it (except from 0). | |
3032 | * If array is active, we can try an on-line resize | |
3033 | */ | |
58c0fed4 AN |
3034 | unsigned long long sectors; |
3035 | int err = strict_strtoull(buf, 10, §ors); | |
a35b0d69 | 3036 | |
58c0fed4 AN |
3037 | if (err < 0) |
3038 | return err; | |
3039 | sectors *= 2; | |
a35b0d69 | 3040 | if (mddev->pers) { |
58c0fed4 | 3041 | err = update_size(mddev, sectors); |
850b2b42 | 3042 | md_update_sb(mddev, 1); |
a35b0d69 | 3043 | } else { |
58c0fed4 AN |
3044 | if (mddev->dev_sectors == 0 || |
3045 | mddev->dev_sectors > sectors) | |
3046 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3047 | else |
3048 | err = -ENOSPC; | |
3049 | } | |
3050 | return err ? err : len; | |
3051 | } | |
3052 | ||
3053 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3054 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3055 | |
8bb93aac N |
3056 | |
3057 | /* Metdata version. | |
e691063a N |
3058 | * This is one of |
3059 | * 'none' for arrays with no metadata (good luck...) | |
3060 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3061 | * or N.M for internally known formats |
3062 | */ | |
3063 | static ssize_t | |
3064 | metadata_show(mddev_t *mddev, char *page) | |
3065 | { | |
3066 | if (mddev->persistent) | |
3067 | return sprintf(page, "%d.%d\n", | |
3068 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3069 | else if (mddev->external) |
3070 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3071 | else |
3072 | return sprintf(page, "none\n"); | |
3073 | } | |
3074 | ||
3075 | static ssize_t | |
3076 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3077 | { | |
3078 | int major, minor; | |
3079 | char *e; | |
ea43ddd8 N |
3080 | /* Changing the details of 'external' metadata is |
3081 | * always permitted. Otherwise there must be | |
3082 | * no devices attached to the array. | |
3083 | */ | |
3084 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3085 | ; | |
3086 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3087 | return -EBUSY; |
3088 | ||
3089 | if (cmd_match(buf, "none")) { | |
3090 | mddev->persistent = 0; | |
e691063a N |
3091 | mddev->external = 0; |
3092 | mddev->major_version = 0; | |
3093 | mddev->minor_version = 90; | |
3094 | return len; | |
3095 | } | |
3096 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3097 | size_t namelen = len-9; |
e691063a N |
3098 | if (namelen >= sizeof(mddev->metadata_type)) |
3099 | namelen = sizeof(mddev->metadata_type)-1; | |
3100 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3101 | mddev->metadata_type[namelen] = 0; | |
3102 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3103 | mddev->metadata_type[--namelen] = 0; | |
3104 | mddev->persistent = 0; | |
3105 | mddev->external = 1; | |
8bb93aac N |
3106 | mddev->major_version = 0; |
3107 | mddev->minor_version = 90; | |
3108 | return len; | |
3109 | } | |
3110 | major = simple_strtoul(buf, &e, 10); | |
3111 | if (e==buf || *e != '.') | |
3112 | return -EINVAL; | |
3113 | buf = e+1; | |
3114 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3115 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3116 | return -EINVAL; |
50511da3 | 3117 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3118 | return -ENOENT; |
3119 | mddev->major_version = major; | |
3120 | mddev->minor_version = minor; | |
3121 | mddev->persistent = 1; | |
e691063a | 3122 | mddev->external = 0; |
8bb93aac N |
3123 | return len; |
3124 | } | |
3125 | ||
3126 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3127 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3128 | |
24dd469d | 3129 | static ssize_t |
7eec314d | 3130 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3131 | { |
7eec314d | 3132 | char *type = "idle"; |
31399d9e | 3133 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 3134 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3135 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3136 | type = "reshape"; | |
3137 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3138 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3139 | type = "resync"; | |
3140 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3141 | type = "check"; | |
3142 | else | |
3143 | type = "repair"; | |
72a23c21 | 3144 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3145 | type = "recover"; |
3146 | } | |
3147 | return sprintf(page, "%s\n", type); | |
3148 | } | |
3149 | ||
3150 | static ssize_t | |
7eec314d | 3151 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3152 | { |
7eec314d N |
3153 | if (!mddev->pers || !mddev->pers->sync_request) |
3154 | return -EINVAL; | |
3155 | ||
bce74dac | 3156 | if (cmd_match(page, "idle")) { |
7eec314d N |
3157 | if (mddev->sync_thread) { |
3158 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3159 | md_unregister_thread(mddev->sync_thread); | |
3160 | mddev->sync_thread = NULL; | |
3161 | mddev->recovery = 0; | |
3162 | } | |
03c902e1 N |
3163 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3164 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3165 | return -EBUSY; |
72a23c21 NB |
3166 | else if (cmd_match(page, "resync")) |
3167 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3168 | else if (cmd_match(page, "recover")) { | |
3169 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3170 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3171 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3172 | int err; |
3173 | if (mddev->pers->start_reshape == NULL) | |
3174 | return -EINVAL; | |
3175 | err = mddev->pers->start_reshape(mddev); | |
3176 | if (err) | |
3177 | return err; | |
a99ac971 | 3178 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3179 | } else { |
bce74dac | 3180 | if (cmd_match(page, "check")) |
7eec314d | 3181 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3182 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3183 | return -EINVAL; |
3184 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3185 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3186 | } |
03c902e1 | 3187 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3188 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3189 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3190 | return len; |
3191 | } | |
3192 | ||
9d88883e | 3193 | static ssize_t |
96de1e66 | 3194 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3195 | { |
3196 | return sprintf(page, "%llu\n", | |
3197 | (unsigned long long) mddev->resync_mismatches); | |
3198 | } | |
3199 | ||
80ca3a44 N |
3200 | static struct md_sysfs_entry md_scan_mode = |
3201 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3202 | |
96de1e66 | 3203 | |
80ca3a44 | 3204 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3205 | |
88202a0c N |
3206 | static ssize_t |
3207 | sync_min_show(mddev_t *mddev, char *page) | |
3208 | { | |
3209 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3210 | mddev->sync_speed_min ? "local": "system"); | |
3211 | } | |
3212 | ||
3213 | static ssize_t | |
3214 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3215 | { | |
3216 | int min; | |
3217 | char *e; | |
3218 | if (strncmp(buf, "system", 6)==0) { | |
3219 | mddev->sync_speed_min = 0; | |
3220 | return len; | |
3221 | } | |
3222 | min = simple_strtoul(buf, &e, 10); | |
3223 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3224 | return -EINVAL; | |
3225 | mddev->sync_speed_min = min; | |
3226 | return len; | |
3227 | } | |
3228 | ||
3229 | static struct md_sysfs_entry md_sync_min = | |
3230 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3231 | ||
3232 | static ssize_t | |
3233 | sync_max_show(mddev_t *mddev, char *page) | |
3234 | { | |
3235 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3236 | mddev->sync_speed_max ? "local": "system"); | |
3237 | } | |
3238 | ||
3239 | static ssize_t | |
3240 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3241 | { | |
3242 | int max; | |
3243 | char *e; | |
3244 | if (strncmp(buf, "system", 6)==0) { | |
3245 | mddev->sync_speed_max = 0; | |
3246 | return len; | |
3247 | } | |
3248 | max = simple_strtoul(buf, &e, 10); | |
3249 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3250 | return -EINVAL; | |
3251 | mddev->sync_speed_max = max; | |
3252 | return len; | |
3253 | } | |
3254 | ||
3255 | static struct md_sysfs_entry md_sync_max = | |
3256 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3257 | ||
d7f3d291 IP |
3258 | static ssize_t |
3259 | degraded_show(mddev_t *mddev, char *page) | |
3260 | { | |
3261 | return sprintf(page, "%d\n", mddev->degraded); | |
3262 | } | |
3263 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3264 | |
90b08710 BS |
3265 | static ssize_t |
3266 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3267 | { | |
3268 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3269 | } | |
3270 | ||
3271 | static ssize_t | |
3272 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3273 | { | |
3274 | long n; | |
3275 | ||
3276 | if (strict_strtol(buf, 10, &n)) | |
3277 | return -EINVAL; | |
3278 | ||
3279 | if (n != 0 && n != 1) | |
3280 | return -EINVAL; | |
3281 | ||
3282 | mddev->parallel_resync = n; | |
3283 | ||
3284 | if (mddev->sync_thread) | |
3285 | wake_up(&resync_wait); | |
3286 | ||
3287 | return len; | |
3288 | } | |
3289 | ||
3290 | /* force parallel resync, even with shared block devices */ | |
3291 | static struct md_sysfs_entry md_sync_force_parallel = | |
3292 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3293 | sync_force_parallel_show, sync_force_parallel_store); | |
3294 | ||
88202a0c N |
3295 | static ssize_t |
3296 | sync_speed_show(mddev_t *mddev, char *page) | |
3297 | { | |
3298 | unsigned long resync, dt, db; | |
9687a60c AN |
3299 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3300 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3301 | if (!dt) dt++; |
9687a60c AN |
3302 | db = resync - mddev->resync_mark_cnt; |
3303 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3304 | } |
3305 | ||
80ca3a44 | 3306 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3307 | |
3308 | static ssize_t | |
3309 | sync_completed_show(mddev_t *mddev, char *page) | |
3310 | { | |
58c0fed4 | 3311 | unsigned long max_sectors, resync; |
88202a0c N |
3312 | |
3313 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
58c0fed4 | 3314 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3315 | else |
58c0fed4 | 3316 | max_sectors = mddev->dev_sectors; |
88202a0c N |
3317 | |
3318 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
58c0fed4 | 3319 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3320 | } |
3321 | ||
80ca3a44 | 3322 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3323 | |
5e96ee65 NB |
3324 | static ssize_t |
3325 | min_sync_show(mddev_t *mddev, char *page) | |
3326 | { | |
3327 | return sprintf(page, "%llu\n", | |
3328 | (unsigned long long)mddev->resync_min); | |
3329 | } | |
3330 | static ssize_t | |
3331 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3332 | { | |
3333 | unsigned long long min; | |
3334 | if (strict_strtoull(buf, 10, &min)) | |
3335 | return -EINVAL; | |
3336 | if (min > mddev->resync_max) | |
3337 | return -EINVAL; | |
3338 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3339 | return -EBUSY; | |
3340 | ||
3341 | /* Must be a multiple of chunk_size */ | |
3342 | if (mddev->chunk_size) { | |
3343 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3344 | return -EINVAL; | |
3345 | } | |
3346 | mddev->resync_min = min; | |
3347 | ||
3348 | return len; | |
3349 | } | |
3350 | ||
3351 | static struct md_sysfs_entry md_min_sync = | |
3352 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3353 | ||
c6207277 N |
3354 | static ssize_t |
3355 | max_sync_show(mddev_t *mddev, char *page) | |
3356 | { | |
3357 | if (mddev->resync_max == MaxSector) | |
3358 | return sprintf(page, "max\n"); | |
3359 | else | |
3360 | return sprintf(page, "%llu\n", | |
3361 | (unsigned long long)mddev->resync_max); | |
3362 | } | |
3363 | static ssize_t | |
3364 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3365 | { | |
3366 | if (strncmp(buf, "max", 3) == 0) | |
3367 | mddev->resync_max = MaxSector; | |
3368 | else { | |
5e96ee65 NB |
3369 | unsigned long long max; |
3370 | if (strict_strtoull(buf, 10, &max)) | |
3371 | return -EINVAL; | |
3372 | if (max < mddev->resync_min) | |
c6207277 N |
3373 | return -EINVAL; |
3374 | if (max < mddev->resync_max && | |
3375 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3376 | return -EBUSY; | |
3377 | ||
3378 | /* Must be a multiple of chunk_size */ | |
3379 | if (mddev->chunk_size) { | |
3380 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3381 | return -EINVAL; | |
3382 | } | |
3383 | mddev->resync_max = max; | |
3384 | } | |
3385 | wake_up(&mddev->recovery_wait); | |
3386 | return len; | |
3387 | } | |
3388 | ||
3389 | static struct md_sysfs_entry md_max_sync = | |
3390 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3391 | ||
e464eafd N |
3392 | static ssize_t |
3393 | suspend_lo_show(mddev_t *mddev, char *page) | |
3394 | { | |
3395 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3396 | } | |
3397 | ||
3398 | static ssize_t | |
3399 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3400 | { | |
3401 | char *e; | |
3402 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3403 | ||
3404 | if (mddev->pers->quiesce == NULL) | |
3405 | return -EINVAL; | |
3406 | if (buf == e || (*e && *e != '\n')) | |
3407 | return -EINVAL; | |
3408 | if (new >= mddev->suspend_hi || | |
3409 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3410 | mddev->suspend_lo = new; | |
3411 | mddev->pers->quiesce(mddev, 2); | |
3412 | return len; | |
3413 | } else | |
3414 | return -EINVAL; | |
3415 | } | |
3416 | static struct md_sysfs_entry md_suspend_lo = | |
3417 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3418 | ||
3419 | ||
3420 | static ssize_t | |
3421 | suspend_hi_show(mddev_t *mddev, char *page) | |
3422 | { | |
3423 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3424 | } | |
3425 | ||
3426 | static ssize_t | |
3427 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3428 | { | |
3429 | char *e; | |
3430 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3431 | ||
3432 | if (mddev->pers->quiesce == NULL) | |
3433 | return -EINVAL; | |
3434 | if (buf == e || (*e && *e != '\n')) | |
3435 | return -EINVAL; | |
3436 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3437 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3438 | mddev->suspend_hi = new; | |
3439 | mddev->pers->quiesce(mddev, 1); | |
3440 | mddev->pers->quiesce(mddev, 0); | |
3441 | return len; | |
3442 | } else | |
3443 | return -EINVAL; | |
3444 | } | |
3445 | static struct md_sysfs_entry md_suspend_hi = | |
3446 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3447 | ||
08a02ecd N |
3448 | static ssize_t |
3449 | reshape_position_show(mddev_t *mddev, char *page) | |
3450 | { | |
3451 | if (mddev->reshape_position != MaxSector) | |
3452 | return sprintf(page, "%llu\n", | |
3453 | (unsigned long long)mddev->reshape_position); | |
3454 | strcpy(page, "none\n"); | |
3455 | return 5; | |
3456 | } | |
3457 | ||
3458 | static ssize_t | |
3459 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3460 | { | |
3461 | char *e; | |
3462 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3463 | if (mddev->pers) | |
3464 | return -EBUSY; | |
3465 | if (buf == e || (*e && *e != '\n')) | |
3466 | return -EINVAL; | |
3467 | mddev->reshape_position = new; | |
3468 | mddev->delta_disks = 0; | |
3469 | mddev->new_level = mddev->level; | |
3470 | mddev->new_layout = mddev->layout; | |
3471 | mddev->new_chunk = mddev->chunk_size; | |
3472 | return len; | |
3473 | } | |
3474 | ||
3475 | static struct md_sysfs_entry md_reshape_position = | |
3476 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3477 | reshape_position_store); | |
3478 | ||
e464eafd | 3479 | |
eae1701f N |
3480 | static struct attribute *md_default_attrs[] = { |
3481 | &md_level.attr, | |
d4dbd025 | 3482 | &md_layout.attr, |
eae1701f | 3483 | &md_raid_disks.attr, |
3b34380a | 3484 | &md_chunk_size.attr, |
a35b0d69 | 3485 | &md_size.attr, |
a94213b1 | 3486 | &md_resync_start.attr, |
8bb93aac | 3487 | &md_metadata.attr, |
6d7ff738 | 3488 | &md_new_device.attr, |
16f17b39 | 3489 | &md_safe_delay.attr, |
9e653b63 | 3490 | &md_array_state.attr, |
08a02ecd | 3491 | &md_reshape_position.attr, |
411036fa N |
3492 | NULL, |
3493 | }; | |
3494 | ||
3495 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3496 | &md_scan_mode.attr, |
9d88883e | 3497 | &md_mismatches.attr, |
88202a0c N |
3498 | &md_sync_min.attr, |
3499 | &md_sync_max.attr, | |
3500 | &md_sync_speed.attr, | |
90b08710 | 3501 | &md_sync_force_parallel.attr, |
88202a0c | 3502 | &md_sync_completed.attr, |
5e96ee65 | 3503 | &md_min_sync.attr, |
c6207277 | 3504 | &md_max_sync.attr, |
e464eafd N |
3505 | &md_suspend_lo.attr, |
3506 | &md_suspend_hi.attr, | |
9b1d1dac | 3507 | &md_bitmap.attr, |
d7f3d291 | 3508 | &md_degraded.attr, |
eae1701f N |
3509 | NULL, |
3510 | }; | |
411036fa N |
3511 | static struct attribute_group md_redundancy_group = { |
3512 | .name = NULL, | |
3513 | .attrs = md_redundancy_attrs, | |
3514 | }; | |
3515 | ||
eae1701f N |
3516 | |
3517 | static ssize_t | |
3518 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3519 | { | |
3520 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3521 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3522 | ssize_t rv; |
eae1701f N |
3523 | |
3524 | if (!entry->show) | |
3525 | return -EIO; | |
5dc5cf7d IM |
3526 | rv = mddev_lock(mddev); |
3527 | if (!rv) { | |
3528 | rv = entry->show(mddev, page); | |
3529 | mddev_unlock(mddev); | |
3530 | } | |
96de1e66 | 3531 | return rv; |
eae1701f N |
3532 | } |
3533 | ||
3534 | static ssize_t | |
3535 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3536 | const char *page, size_t length) | |
3537 | { | |
3538 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3539 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3540 | ssize_t rv; |
eae1701f N |
3541 | |
3542 | if (!entry->store) | |
3543 | return -EIO; | |
67463acb N |
3544 | if (!capable(CAP_SYS_ADMIN)) |
3545 | return -EACCES; | |
5dc5cf7d | 3546 | rv = mddev_lock(mddev); |
d3374825 N |
3547 | if (mddev->hold_active == UNTIL_IOCTL) |
3548 | mddev->hold_active = 0; | |
5dc5cf7d IM |
3549 | if (!rv) { |
3550 | rv = entry->store(mddev, page, length); | |
3551 | mddev_unlock(mddev); | |
3552 | } | |
96de1e66 | 3553 | return rv; |
eae1701f N |
3554 | } |
3555 | ||
3556 | static void md_free(struct kobject *ko) | |
3557 | { | |
3558 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
3559 | |
3560 | if (mddev->sysfs_state) | |
3561 | sysfs_put(mddev->sysfs_state); | |
3562 | ||
3563 | if (mddev->gendisk) { | |
3564 | del_gendisk(mddev->gendisk); | |
3565 | put_disk(mddev->gendisk); | |
3566 | } | |
3567 | if (mddev->queue) | |
3568 | blk_cleanup_queue(mddev->queue); | |
3569 | ||
eae1701f N |
3570 | kfree(mddev); |
3571 | } | |
3572 | ||
3573 | static struct sysfs_ops md_sysfs_ops = { | |
3574 | .show = md_attr_show, | |
3575 | .store = md_attr_store, | |
3576 | }; | |
3577 | static struct kobj_type md_ktype = { | |
3578 | .release = md_free, | |
3579 | .sysfs_ops = &md_sysfs_ops, | |
3580 | .default_attrs = md_default_attrs, | |
3581 | }; | |
3582 | ||
1da177e4 LT |
3583 | int mdp_major = 0; |
3584 | ||
efeb53c0 | 3585 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 3586 | { |
48c9c27b | 3587 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3588 | mddev_t *mddev = mddev_find(dev); |
3589 | struct gendisk *disk; | |
efeb53c0 N |
3590 | int partitioned; |
3591 | int shift; | |
3592 | int unit; | |
3830c62f | 3593 | int error; |
1da177e4 LT |
3594 | |
3595 | if (!mddev) | |
efeb53c0 N |
3596 | return -ENODEV; |
3597 | ||
3598 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
3599 | shift = partitioned ? MdpMinorShift : 0; | |
3600 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 3601 | |
d3374825 N |
3602 | /* wait for any previous instance if this device |
3603 | * to be completed removed (mddev_delayed_delete). | |
3604 | */ | |
3605 | flush_scheduled_work(); | |
3606 | ||
48c9c27b | 3607 | mutex_lock(&disks_mutex); |
1da177e4 | 3608 | if (mddev->gendisk) { |
48c9c27b | 3609 | mutex_unlock(&disks_mutex); |
1da177e4 | 3610 | mddev_put(mddev); |
efeb53c0 N |
3611 | return -EEXIST; |
3612 | } | |
3613 | ||
3614 | if (name) { | |
3615 | /* Need to ensure that 'name' is not a duplicate. | |
3616 | */ | |
3617 | mddev_t *mddev2; | |
3618 | spin_lock(&all_mddevs_lock); | |
3619 | ||
3620 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
3621 | if (mddev2->gendisk && | |
3622 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
3623 | spin_unlock(&all_mddevs_lock); | |
3624 | return -EEXIST; | |
3625 | } | |
3626 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 3627 | } |
8b765398 N |
3628 | |
3629 | mddev->queue = blk_alloc_queue(GFP_KERNEL); | |
3630 | if (!mddev->queue) { | |
3631 | mutex_unlock(&disks_mutex); | |
3632 | mddev_put(mddev); | |
efeb53c0 | 3633 | return -ENOMEM; |
8b765398 N |
3634 | } |
3635 | /* Can be unlocked because the queue is new: no concurrency */ | |
3636 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
3637 | ||
3638 | blk_queue_make_request(mddev->queue, md_fail_request); | |
3639 | ||
1da177e4 LT |
3640 | disk = alloc_disk(1 << shift); |
3641 | if (!disk) { | |
48c9c27b | 3642 | mutex_unlock(&disks_mutex); |
8b765398 N |
3643 | blk_cleanup_queue(mddev->queue); |
3644 | mddev->queue = NULL; | |
1da177e4 | 3645 | mddev_put(mddev); |
efeb53c0 | 3646 | return -ENOMEM; |
1da177e4 | 3647 | } |
efeb53c0 | 3648 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 3649 | disk->first_minor = unit << shift; |
efeb53c0 N |
3650 | if (name) |
3651 | strcpy(disk->disk_name, name); | |
3652 | else if (partitioned) | |
1da177e4 | 3653 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3654 | else |
1da177e4 | 3655 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3656 | disk->fops = &md_fops; |
3657 | disk->private_data = mddev; | |
3658 | disk->queue = mddev->queue; | |
92850bbd | 3659 | /* Allow extended partitions. This makes the |
d3374825 | 3660 | * 'mdp' device redundant, but we can't really |
92850bbd N |
3661 | * remove it now. |
3662 | */ | |
3663 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
3664 | add_disk(disk); |
3665 | mddev->gendisk = disk; | |
ed9e1982 TH |
3666 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
3667 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
f48ed538 | 3668 | mutex_unlock(&disks_mutex); |
3830c62f | 3669 | if (error) |
5e55e2f5 N |
3670 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3671 | disk->disk_name); | |
b62b7590 | 3672 | else { |
3830c62f | 3673 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
3674 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
3675 | } | |
d3374825 | 3676 | mddev_put(mddev); |
efeb53c0 N |
3677 | return 0; |
3678 | } | |
3679 | ||
3680 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3681 | { | |
3682 | md_alloc(dev, NULL); | |
1da177e4 LT |
3683 | return NULL; |
3684 | } | |
3685 | ||
efeb53c0 N |
3686 | static int add_named_array(const char *val, struct kernel_param *kp) |
3687 | { | |
3688 | /* val must be "md_*" where * is not all digits. | |
3689 | * We allocate an array with a large free minor number, and | |
3690 | * set the name to val. val must not already be an active name. | |
3691 | */ | |
3692 | int len = strlen(val); | |
3693 | char buf[DISK_NAME_LEN]; | |
3694 | ||
3695 | while (len && val[len-1] == '\n') | |
3696 | len--; | |
3697 | if (len >= DISK_NAME_LEN) | |
3698 | return -E2BIG; | |
3699 | strlcpy(buf, val, len+1); | |
3700 | if (strncmp(buf, "md_", 3) != 0) | |
3701 | return -EINVAL; | |
3702 | return md_alloc(0, buf); | |
3703 | } | |
3704 | ||
1da177e4 LT |
3705 | static void md_safemode_timeout(unsigned long data) |
3706 | { | |
3707 | mddev_t *mddev = (mddev_t *) data; | |
3708 | ||
0fd62b86 NB |
3709 | if (!atomic_read(&mddev->writes_pending)) { |
3710 | mddev->safemode = 1; | |
3711 | if (mddev->external) | |
b62b7590 | 3712 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 3713 | } |
1da177e4 LT |
3714 | md_wakeup_thread(mddev->thread); |
3715 | } | |
3716 | ||
6ff8d8ec | 3717 | static int start_dirty_degraded; |
1da177e4 LT |
3718 | |
3719 | static int do_md_run(mddev_t * mddev) | |
3720 | { | |
2604b703 | 3721 | int err; |
1da177e4 | 3722 | int chunk_size; |
1da177e4 LT |
3723 | mdk_rdev_t *rdev; |
3724 | struct gendisk *disk; | |
2604b703 | 3725 | struct mdk_personality *pers; |
1da177e4 LT |
3726 | char b[BDEVNAME_SIZE]; |
3727 | ||
a757e64c N |
3728 | if (list_empty(&mddev->disks)) |
3729 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3730 | return -EINVAL; |
1da177e4 LT |
3731 | |
3732 | if (mddev->pers) | |
3733 | return -EBUSY; | |
3734 | ||
3735 | /* | |
3736 | * Analyze all RAID superblock(s) | |
3737 | */ | |
1ec4a939 N |
3738 | if (!mddev->raid_disks) { |
3739 | if (!mddev->persistent) | |
3740 | return -EINVAL; | |
a757e64c | 3741 | analyze_sbs(mddev); |
1ec4a939 | 3742 | } |
1da177e4 LT |
3743 | |
3744 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3745 | |
3746 | if (chunk_size) { | |
1da177e4 LT |
3747 | if (chunk_size > MAX_CHUNK_SIZE) { |
3748 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3749 | chunk_size, MAX_CHUNK_SIZE); | |
3750 | return -EINVAL; | |
3751 | } | |
3752 | /* | |
4bbf3771 | 3753 | * chunk-size has to be a power of 2 |
1da177e4 LT |
3754 | */ |
3755 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3756 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3757 | return -EINVAL; |
3758 | } | |
1da177e4 LT |
3759 | |
3760 | /* devices must have minimum size of one chunk */ | |
159ec1fc | 3761 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3762 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3763 | continue; |
dd8ac336 | 3764 | if (rdev->sectors < chunk_size / 512) { |
1da177e4 LT |
3765 | printk(KERN_WARNING |
3766 | "md: Dev %s smaller than chunk_size:" | |
dd8ac336 | 3767 | " %llu < %d\n", |
1da177e4 | 3768 | bdevname(rdev->bdev,b), |
dd8ac336 AN |
3769 | (unsigned long long)rdev->sectors, |
3770 | chunk_size / 512); | |
1da177e4 LT |
3771 | return -EINVAL; |
3772 | } | |
3773 | } | |
3774 | } | |
3775 | ||
d9d166c2 N |
3776 | if (mddev->level != LEVEL_NONE) |
3777 | request_module("md-level-%d", mddev->level); | |
3778 | else if (mddev->clevel[0]) | |
3779 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
3780 | |
3781 | /* | |
3782 | * Drop all container device buffers, from now on | |
3783 | * the only valid external interface is through the md | |
3784 | * device. | |
1da177e4 | 3785 | */ |
159ec1fc | 3786 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3787 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
3788 | continue; |
3789 | sync_blockdev(rdev->bdev); | |
f98393a6 | 3790 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
3791 | |
3792 | /* perform some consistency tests on the device. | |
3793 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 3794 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 3795 | */ |
0f420358 | 3796 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
3797 | if (mddev->dev_sectors && |
3798 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 3799 | > rdev->sb_start) { |
f0d76d70 N |
3800 | printk("md: %s: data overlaps metadata\n", |
3801 | mdname(mddev)); | |
3802 | return -EINVAL; | |
3803 | } | |
3804 | } else { | |
0f420358 | 3805 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
3806 | > rdev->data_offset) { |
3807 | printk("md: %s: metadata overlaps data\n", | |
3808 | mdname(mddev)); | |
3809 | return -EINVAL; | |
3810 | } | |
3811 | } | |
3c0ee63a | 3812 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
3813 | } |
3814 | ||
3815 | md_probe(mddev->unit, NULL, NULL); | |
3816 | disk = mddev->gendisk; | |
3817 | if (!disk) | |
3818 | return -ENOMEM; | |
3819 | ||
3820 | spin_lock(&pers_lock); | |
d9d166c2 | 3821 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 3822 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 3823 | spin_unlock(&pers_lock); |
d9d166c2 N |
3824 | if (mddev->level != LEVEL_NONE) |
3825 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
3826 | mddev->level); | |
3827 | else | |
3828 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
3829 | mddev->clevel); | |
1da177e4 LT |
3830 | return -EINVAL; |
3831 | } | |
2604b703 | 3832 | mddev->pers = pers; |
1da177e4 | 3833 | spin_unlock(&pers_lock); |
34817e8c N |
3834 | if (mddev->level != pers->level) { |
3835 | mddev->level = pers->level; | |
3836 | mddev->new_level = pers->level; | |
3837 | } | |
d9d166c2 | 3838 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 3839 | |
3f9d99c1 MP |
3840 | if (pers->level >= 4 && pers->level <= 6) |
3841 | /* Cannot support integrity (yet) */ | |
3842 | blk_integrity_unregister(mddev->gendisk); | |
3843 | ||
f6705578 | 3844 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 3845 | pers->start_reshape == NULL) { |
f6705578 N |
3846 | /* This personality cannot handle reshaping... */ |
3847 | mddev->pers = NULL; | |
3848 | module_put(pers->owner); | |
3849 | return -EINVAL; | |
3850 | } | |
3851 | ||
7dd5e7c3 N |
3852 | if (pers->sync_request) { |
3853 | /* Warn if this is a potentially silly | |
3854 | * configuration. | |
3855 | */ | |
3856 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3857 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 3858 | int warned = 0; |
159ec1fc CR |
3859 | |
3860 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
3861 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
3862 | if (rdev < rdev2 && |
3863 | rdev->bdev->bd_contains == | |
3864 | rdev2->bdev->bd_contains) { | |
3865 | printk(KERN_WARNING | |
3866 | "%s: WARNING: %s appears to be" | |
3867 | " on the same physical disk as" | |
3868 | " %s.\n", | |
3869 | mdname(mddev), | |
3870 | bdevname(rdev->bdev,b), | |
3871 | bdevname(rdev2->bdev,b2)); | |
3872 | warned = 1; | |
3873 | } | |
3874 | } | |
159ec1fc | 3875 | |
7dd5e7c3 N |
3876 | if (warned) |
3877 | printk(KERN_WARNING | |
3878 | "True protection against single-disk" | |
3879 | " failure might be compromised.\n"); | |
3880 | } | |
3881 | ||
657390d2 | 3882 | mddev->recovery = 0; |
58c0fed4 AN |
3883 | /* may be over-ridden by personality */ |
3884 | mddev->resync_max_sectors = mddev->dev_sectors; | |
3885 | ||
a9701a30 | 3886 | mddev->barriers_work = 1; |
6ff8d8ec | 3887 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 3888 | |
f91de92e N |
3889 | if (start_readonly) |
3890 | mddev->ro = 2; /* read-only, but switch on first write */ | |
3891 | ||
b15c2e57 | 3892 | err = mddev->pers->run(mddev); |
13e53df3 AN |
3893 | if (err) |
3894 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
3895 | else if (mddev->pers->sync_request) { | |
b15c2e57 N |
3896 | err = bitmap_create(mddev); |
3897 | if (err) { | |
3898 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
3899 | mdname(mddev), err); | |
3900 | mddev->pers->stop(mddev); | |
3901 | } | |
3902 | } | |
1da177e4 | 3903 | if (err) { |
1da177e4 LT |
3904 | module_put(mddev->pers->owner); |
3905 | mddev->pers = NULL; | |
32a7627c N |
3906 | bitmap_destroy(mddev); |
3907 | return err; | |
1da177e4 | 3908 | } |
5e55e2f5 N |
3909 | if (mddev->pers->sync_request) { |
3910 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3911 | printk(KERN_WARNING | |
3912 | "md: cannot register extra attributes for %s\n", | |
3913 | mdname(mddev)); | |
0c3573f1 | 3914 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 3915 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
3916 | mddev->ro = 0; |
3917 | ||
1da177e4 LT |
3918 | atomic_set(&mddev->writes_pending,0); |
3919 | mddev->safemode = 0; | |
3920 | mddev->safemode_timer.function = md_safemode_timeout; | |
3921 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 3922 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 3923 | mddev->in_sync = 1; |
86e6ffdd | 3924 | |
159ec1fc | 3925 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
3926 | if (rdev->raid_disk >= 0) { |
3927 | char nm[20]; | |
3928 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
3929 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
3930 | printk("md: cannot register %s for %s\n", | |
3931 | nm, mdname(mddev)); | |
86e6ffdd | 3932 | } |
1da177e4 LT |
3933 | |
3934 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3935 | ||
850b2b42 N |
3936 | if (mddev->flags) |
3937 | md_update_sb(mddev, 0); | |
1da177e4 | 3938 | |
f233ea5c | 3939 | set_capacity(disk, mddev->array_sectors); |
1da177e4 LT |
3940 | |
3941 | /* If we call blk_queue_make_request here, it will | |
3942 | * re-initialise max_sectors etc which may have been | |
3943 | * refined inside -> run. So just set the bits we need to set. | |
3944 | * Most initialisation happended when we called | |
3945 | * blk_queue_make_request(..., md_fail_request) | |
3946 | * earlier. | |
3947 | */ | |
3948 | mddev->queue->queuedata = mddev; | |
3949 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
3950 | ||
5fd6c1dc N |
3951 | /* If there is a partially-recovered drive we need to |
3952 | * start recovery here. If we leave it to md_check_recovery, | |
3953 | * it will remove the drives and not do the right thing | |
3954 | */ | |
0b8c9de0 | 3955 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 3956 | int spares = 0; |
159ec1fc | 3957 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
3958 | if (rdev->raid_disk >= 0 && |
3959 | !test_bit(In_sync, &rdev->flags) && | |
3960 | !test_bit(Faulty, &rdev->flags)) | |
3961 | /* complete an interrupted recovery */ | |
3962 | spares++; | |
3963 | if (spares && mddev->pers->sync_request) { | |
3964 | mddev->recovery = 0; | |
3965 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3966 | mddev->sync_thread = md_register_thread(md_do_sync, | |
3967 | mddev, | |
3968 | "%s_resync"); | |
3969 | if (!mddev->sync_thread) { | |
3970 | printk(KERN_ERR "%s: could not start resync" | |
3971 | " thread...\n", | |
3972 | mdname(mddev)); | |
3973 | /* leave the spares where they are, it shouldn't hurt */ | |
3974 | mddev->recovery = 0; | |
0b8c9de0 | 3975 | } |
5fd6c1dc N |
3976 | } |
3977 | } | |
0b8c9de0 N |
3978 | md_wakeup_thread(mddev->thread); |
3979 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 3980 | |
44ce6294 | 3981 | mddev->changed = 1; |
d7603b7e | 3982 | md_new_event(mddev); |
b62b7590 | 3983 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
3984 | if (mddev->sysfs_action) |
3985 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 3986 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 3987 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
3988 | return 0; |
3989 | } | |
3990 | ||
3991 | static int restart_array(mddev_t *mddev) | |
3992 | { | |
3993 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 3994 | |
80fab1d7 | 3995 | /* Complain if it has no devices */ |
1da177e4 | 3996 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
3997 | return -ENXIO; |
3998 | if (!mddev->pers) | |
3999 | return -EINVAL; | |
4000 | if (!mddev->ro) | |
4001 | return -EBUSY; | |
4002 | mddev->safemode = 0; | |
4003 | mddev->ro = 0; | |
4004 | set_disk_ro(disk, 0); | |
4005 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4006 | mdname(mddev)); | |
4007 | /* Kick recovery or resync if necessary */ | |
4008 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4009 | md_wakeup_thread(mddev->thread); | |
4010 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 4011 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 4012 | return 0; |
1da177e4 LT |
4013 | } |
4014 | ||
acc55e22 N |
4015 | /* similar to deny_write_access, but accounts for our holding a reference |
4016 | * to the file ourselves */ | |
4017 | static int deny_bitmap_write_access(struct file * file) | |
4018 | { | |
4019 | struct inode *inode = file->f_mapping->host; | |
4020 | ||
4021 | spin_lock(&inode->i_lock); | |
4022 | if (atomic_read(&inode->i_writecount) > 1) { | |
4023 | spin_unlock(&inode->i_lock); | |
4024 | return -ETXTBSY; | |
4025 | } | |
4026 | atomic_set(&inode->i_writecount, -1); | |
4027 | spin_unlock(&inode->i_lock); | |
4028 | ||
4029 | return 0; | |
4030 | } | |
4031 | ||
4032 | static void restore_bitmap_write_access(struct file *file) | |
4033 | { | |
4034 | struct inode *inode = file->f_mapping->host; | |
4035 | ||
4036 | spin_lock(&inode->i_lock); | |
4037 | atomic_set(&inode->i_writecount, 1); | |
4038 | spin_unlock(&inode->i_lock); | |
4039 | } | |
4040 | ||
9e653b63 N |
4041 | /* mode: |
4042 | * 0 - completely stop and dis-assemble array | |
4043 | * 1 - switch to readonly | |
4044 | * 2 - stop but do not disassemble array | |
4045 | */ | |
df5b20cf | 4046 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
4047 | { |
4048 | int err = 0; | |
4049 | struct gendisk *disk = mddev->gendisk; | |
4050 | ||
f2ea68cf | 4051 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf NB |
4052 | printk("md: %s still in use.\n",mdname(mddev)); |
4053 | return -EBUSY; | |
4054 | } | |
4055 | ||
1da177e4 | 4056 | if (mddev->pers) { |
1da177e4 LT |
4057 | |
4058 | if (mddev->sync_thread) { | |
5fd6c1dc | 4059 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
4060 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4061 | md_unregister_thread(mddev->sync_thread); | |
4062 | mddev->sync_thread = NULL; | |
4063 | } | |
4064 | ||
4065 | del_timer_sync(&mddev->safemode_timer); | |
4066 | ||
9e653b63 N |
4067 | switch(mode) { |
4068 | case 1: /* readonly */ | |
1da177e4 | 4069 | err = -ENXIO; |
f91de92e | 4070 | if (mddev->ro==1) |
1da177e4 LT |
4071 | goto out; |
4072 | mddev->ro = 1; | |
9e653b63 N |
4073 | break; |
4074 | case 0: /* disassemble */ | |
4075 | case 2: /* stop */ | |
6b8b3e8a | 4076 | bitmap_flush(mddev); |
a9701a30 | 4077 | md_super_wait(mddev); |
1da177e4 LT |
4078 | if (mddev->ro) |
4079 | set_disk_ro(disk, 0); | |
4080 | blk_queue_make_request(mddev->queue, md_fail_request); | |
4081 | mddev->pers->stop(mddev); | |
d1b5380c N |
4082 | mddev->queue->merge_bvec_fn = NULL; |
4083 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 4084 | mddev->queue->backing_dev_info.congested_fn = NULL; |
0c3573f1 | 4085 | if (mddev->pers->sync_request) { |
411036fa | 4086 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
0c3573f1 N |
4087 | if (mddev->sysfs_action) |
4088 | sysfs_put(mddev->sysfs_action); | |
4089 | mddev->sysfs_action = NULL; | |
4090 | } | |
1da177e4 LT |
4091 | module_put(mddev->pers->owner); |
4092 | mddev->pers = NULL; | |
4f54b0e9 | 4093 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 4094 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 N |
4095 | |
4096 | set_capacity(disk, 0); | |
44ce6294 | 4097 | mddev->changed = 1; |
0d4ca600 | 4098 | |
1da177e4 LT |
4099 | if (mddev->ro) |
4100 | mddev->ro = 0; | |
4101 | } | |
850b2b42 | 4102 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
4103 | /* mark array as shutdown cleanly */ |
4104 | mddev->in_sync = 1; | |
850b2b42 | 4105 | md_update_sb(mddev, 1); |
1da177e4 | 4106 | } |
9e653b63 | 4107 | if (mode == 1) |
1da177e4 | 4108 | set_disk_ro(disk, 1); |
5fd6c1dc | 4109 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 4110 | } |
32a7627c | 4111 | |
1da177e4 LT |
4112 | /* |
4113 | * Free resources if final stop | |
4114 | */ | |
9e653b63 | 4115 | if (mode == 0) { |
86e6ffdd | 4116 | mdk_rdev_t *rdev; |
0d4ca600 | 4117 | |
1da177e4 LT |
4118 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4119 | ||
978f946b N |
4120 | bitmap_destroy(mddev); |
4121 | if (mddev->bitmap_file) { | |
acc55e22 | 4122 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
4123 | fput(mddev->bitmap_file); |
4124 | mddev->bitmap_file = NULL; | |
4125 | } | |
4126 | mddev->bitmap_offset = 0; | |
4127 | ||
159ec1fc | 4128 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4129 | if (rdev->raid_disk >= 0) { |
4130 | char nm[20]; | |
4131 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4132 | sysfs_remove_link(&mddev->kobj, nm); | |
4133 | } | |
4134 | ||
177a99b2 | 4135 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
4136 | flush_scheduled_work(); |
4137 | ||
1da177e4 LT |
4138 | export_array(mddev); |
4139 | ||
f233ea5c | 4140 | mddev->array_sectors = 0; |
58c0fed4 | 4141 | mddev->dev_sectors = 0; |
9e653b63 | 4142 | mddev->raid_disks = 0; |
a94213b1 | 4143 | mddev->recovery_cp = 0; |
5e96ee65 | 4144 | mddev->resync_min = 0; |
c6207277 | 4145 | mddev->resync_max = MaxSector; |
08a02ecd | 4146 | mddev->reshape_position = MaxSector; |
e691063a | 4147 | mddev->external = 0; |
1ec4a939 | 4148 | mddev->persistent = 0; |
d897dbf9 N |
4149 | mddev->level = LEVEL_NONE; |
4150 | mddev->clevel[0] = 0; | |
4151 | mddev->flags = 0; | |
4152 | mddev->ro = 0; | |
4153 | mddev->metadata_type[0] = 0; | |
4154 | mddev->chunk_size = 0; | |
4155 | mddev->ctime = mddev->utime = 0; | |
4156 | mddev->layout = 0; | |
4157 | mddev->max_disks = 0; | |
4158 | mddev->events = 0; | |
4159 | mddev->delta_disks = 0; | |
4160 | mddev->new_level = LEVEL_NONE; | |
4161 | mddev->new_layout = 0; | |
4162 | mddev->new_chunk = 0; | |
4163 | mddev->curr_resync = 0; | |
4164 | mddev->resync_mismatches = 0; | |
4165 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4166 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4167 | mddev->recovery = 0; | |
4168 | mddev->in_sync = 0; | |
4169 | mddev->changed = 0; | |
4170 | mddev->degraded = 0; | |
4171 | mddev->barriers_work = 0; | |
4172 | mddev->safemode = 0; | |
934d9c23 | 4173 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4174 | if (mddev->hold_active == UNTIL_STOP) |
4175 | mddev->hold_active = 0; | |
9e653b63 | 4176 | |
a8a55c38 | 4177 | } else if (mddev->pers) |
1da177e4 LT |
4178 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4179 | mdname(mddev)); | |
4180 | err = 0; | |
3f9d99c1 | 4181 | blk_integrity_unregister(disk); |
d7603b7e | 4182 | md_new_event(mddev); |
b62b7590 | 4183 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4184 | out: |
4185 | return err; | |
4186 | } | |
4187 | ||
fdee8ae4 | 4188 | #ifndef MODULE |
1da177e4 LT |
4189 | static void autorun_array(mddev_t *mddev) |
4190 | { | |
4191 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4192 | int err; |
4193 | ||
a757e64c | 4194 | if (list_empty(&mddev->disks)) |
1da177e4 | 4195 | return; |
1da177e4 LT |
4196 | |
4197 | printk(KERN_INFO "md: running: "); | |
4198 | ||
159ec1fc | 4199 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4200 | char b[BDEVNAME_SIZE]; |
4201 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4202 | } | |
4203 | printk("\n"); | |
4204 | ||
d710e138 | 4205 | err = do_md_run(mddev); |
1da177e4 LT |
4206 | if (err) { |
4207 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4208 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4209 | } |
4210 | } | |
4211 | ||
4212 | /* | |
4213 | * lets try to run arrays based on all disks that have arrived | |
4214 | * until now. (those are in pending_raid_disks) | |
4215 | * | |
4216 | * the method: pick the first pending disk, collect all disks with | |
4217 | * the same UUID, remove all from the pending list and put them into | |
4218 | * the 'same_array' list. Then order this list based on superblock | |
4219 | * update time (freshest comes first), kick out 'old' disks and | |
4220 | * compare superblocks. If everything's fine then run it. | |
4221 | * | |
4222 | * If "unit" is allocated, then bump its reference count | |
4223 | */ | |
4224 | static void autorun_devices(int part) | |
4225 | { | |
159ec1fc | 4226 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4227 | mddev_t *mddev; |
4228 | char b[BDEVNAME_SIZE]; | |
4229 | ||
4230 | printk(KERN_INFO "md: autorun ...\n"); | |
4231 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4232 | int unit; |
1da177e4 | 4233 | dev_t dev; |
ad01c9e3 | 4234 | LIST_HEAD(candidates); |
1da177e4 LT |
4235 | rdev0 = list_entry(pending_raid_disks.next, |
4236 | mdk_rdev_t, same_set); | |
4237 | ||
4238 | printk(KERN_INFO "md: considering %s ...\n", | |
4239 | bdevname(rdev0->bdev,b)); | |
4240 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4241 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4242 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4243 | printk(KERN_INFO "md: adding %s ...\n", | |
4244 | bdevname(rdev->bdev,b)); | |
4245 | list_move(&rdev->same_set, &candidates); | |
4246 | } | |
4247 | /* | |
4248 | * now we have a set of devices, with all of them having | |
4249 | * mostly sane superblocks. It's time to allocate the | |
4250 | * mddev. | |
4251 | */ | |
e8703fe1 N |
4252 | if (part) { |
4253 | dev = MKDEV(mdp_major, | |
4254 | rdev0->preferred_minor << MdpMinorShift); | |
4255 | unit = MINOR(dev) >> MdpMinorShift; | |
4256 | } else { | |
4257 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4258 | unit = MINOR(dev); | |
4259 | } | |
4260 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4261 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4262 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4263 | break; | |
4264 | } | |
1da177e4 LT |
4265 | |
4266 | md_probe(dev, NULL, NULL); | |
4267 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4268 | if (!mddev || !mddev->gendisk) { |
4269 | if (mddev) | |
4270 | mddev_put(mddev); | |
4271 | printk(KERN_ERR | |
1da177e4 LT |
4272 | "md: cannot allocate memory for md drive.\n"); |
4273 | break; | |
4274 | } | |
4275 | if (mddev_lock(mddev)) | |
4276 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4277 | mdname(mddev)); | |
4278 | else if (mddev->raid_disks || mddev->major_version | |
4279 | || !list_empty(&mddev->disks)) { | |
4280 | printk(KERN_WARNING | |
4281 | "md: %s already running, cannot run %s\n", | |
4282 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4283 | mddev_unlock(mddev); | |
4284 | } else { | |
4285 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4286 | mddev->persistent = 1; |
159ec1fc | 4287 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4288 | list_del_init(&rdev->same_set); |
4289 | if (bind_rdev_to_array(rdev, mddev)) | |
4290 | export_rdev(rdev); | |
4291 | } | |
4292 | autorun_array(mddev); | |
4293 | mddev_unlock(mddev); | |
4294 | } | |
4295 | /* on success, candidates will be empty, on error | |
4296 | * it won't... | |
4297 | */ | |
159ec1fc | 4298 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4299 | list_del_init(&rdev->same_set); |
1da177e4 | 4300 | export_rdev(rdev); |
4b80991c | 4301 | } |
1da177e4 LT |
4302 | mddev_put(mddev); |
4303 | } | |
4304 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4305 | } | |
fdee8ae4 | 4306 | #endif /* !MODULE */ |
1da177e4 | 4307 | |
1da177e4 LT |
4308 | static int get_version(void __user * arg) |
4309 | { | |
4310 | mdu_version_t ver; | |
4311 | ||
4312 | ver.major = MD_MAJOR_VERSION; | |
4313 | ver.minor = MD_MINOR_VERSION; | |
4314 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4315 | ||
4316 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4317 | return -EFAULT; | |
4318 | ||
4319 | return 0; | |
4320 | } | |
4321 | ||
4322 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4323 | { | |
4324 | mdu_array_info_t info; | |
4325 | int nr,working,active,failed,spare; | |
4326 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4327 | |
4328 | nr=working=active=failed=spare=0; | |
159ec1fc | 4329 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4330 | nr++; |
b2d444d7 | 4331 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4332 | failed++; |
4333 | else { | |
4334 | working++; | |
b2d444d7 | 4335 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4336 | active++; |
4337 | else | |
4338 | spare++; | |
4339 | } | |
4340 | } | |
4341 | ||
4342 | info.major_version = mddev->major_version; | |
4343 | info.minor_version = mddev->minor_version; | |
4344 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4345 | info.ctime = mddev->ctime; | |
4346 | info.level = mddev->level; | |
58c0fed4 AN |
4347 | info.size = mddev->dev_sectors / 2; |
4348 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4349 | info.size = -1; |
1da177e4 LT |
4350 | info.nr_disks = nr; |
4351 | info.raid_disks = mddev->raid_disks; | |
4352 | info.md_minor = mddev->md_minor; | |
4353 | info.not_persistent= !mddev->persistent; | |
4354 | ||
4355 | info.utime = mddev->utime; | |
4356 | info.state = 0; | |
4357 | if (mddev->in_sync) | |
4358 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4359 | if (mddev->bitmap && mddev->bitmap_offset) |
4360 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4361 | info.active_disks = active; |
4362 | info.working_disks = working; | |
4363 | info.failed_disks = failed; | |
4364 | info.spare_disks = spare; | |
4365 | ||
4366 | info.layout = mddev->layout; | |
4367 | info.chunk_size = mddev->chunk_size; | |
4368 | ||
4369 | if (copy_to_user(arg, &info, sizeof(info))) | |
4370 | return -EFAULT; | |
4371 | ||
4372 | return 0; | |
4373 | } | |
4374 | ||
87162a28 | 4375 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4376 | { |
4377 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4378 | char *ptr, *buf = NULL; | |
4379 | int err = -ENOMEM; | |
4380 | ||
b5470dc5 DW |
4381 | if (md_allow_write(mddev)) |
4382 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4383 | else | |
4384 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4385 | |
32a7627c N |
4386 | if (!file) |
4387 | goto out; | |
4388 | ||
4389 | /* bitmap disabled, zero the first byte and copy out */ | |
4390 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4391 | file->pathname[0] = '\0'; | |
4392 | goto copy_out; | |
4393 | } | |
4394 | ||
4395 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4396 | if (!buf) | |
4397 | goto out; | |
4398 | ||
6bcfd601 CH |
4399 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4400 | if (IS_ERR(ptr)) | |
32a7627c N |
4401 | goto out; |
4402 | ||
4403 | strcpy(file->pathname, ptr); | |
4404 | ||
4405 | copy_out: | |
4406 | err = 0; | |
4407 | if (copy_to_user(arg, file, sizeof(*file))) | |
4408 | err = -EFAULT; | |
4409 | out: | |
4410 | kfree(buf); | |
4411 | kfree(file); | |
4412 | return err; | |
4413 | } | |
4414 | ||
1da177e4 LT |
4415 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4416 | { | |
4417 | mdu_disk_info_t info; | |
1da177e4 LT |
4418 | mdk_rdev_t *rdev; |
4419 | ||
4420 | if (copy_from_user(&info, arg, sizeof(info))) | |
4421 | return -EFAULT; | |
4422 | ||
26ef379f | 4423 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4424 | if (rdev) { |
4425 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4426 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4427 | info.raid_disk = rdev->raid_disk; | |
4428 | info.state = 0; | |
b2d444d7 | 4429 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4430 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4431 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4432 | info.state |= (1<<MD_DISK_ACTIVE); |
4433 | info.state |= (1<<MD_DISK_SYNC); | |
4434 | } | |
8ddf9efe N |
4435 | if (test_bit(WriteMostly, &rdev->flags)) |
4436 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4437 | } else { |
4438 | info.major = info.minor = 0; | |
4439 | info.raid_disk = -1; | |
4440 | info.state = (1<<MD_DISK_REMOVED); | |
4441 | } | |
4442 | ||
4443 | if (copy_to_user(arg, &info, sizeof(info))) | |
4444 | return -EFAULT; | |
4445 | ||
4446 | return 0; | |
4447 | } | |
4448 | ||
4449 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4450 | { | |
4451 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4452 | mdk_rdev_t *rdev; | |
4453 | dev_t dev = MKDEV(info->major,info->minor); | |
4454 | ||
4455 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4456 | return -EOVERFLOW; | |
4457 | ||
4458 | if (!mddev->raid_disks) { | |
4459 | int err; | |
4460 | /* expecting a device which has a superblock */ | |
4461 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4462 | if (IS_ERR(rdev)) { | |
4463 | printk(KERN_WARNING | |
4464 | "md: md_import_device returned %ld\n", | |
4465 | PTR_ERR(rdev)); | |
4466 | return PTR_ERR(rdev); | |
4467 | } | |
4468 | if (!list_empty(&mddev->disks)) { | |
4469 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4470 | mdk_rdev_t, same_set); | |
4471 | int err = super_types[mddev->major_version] | |
4472 | .load_super(rdev, rdev0, mddev->minor_version); | |
4473 | if (err < 0) { | |
4474 | printk(KERN_WARNING | |
4475 | "md: %s has different UUID to %s\n", | |
4476 | bdevname(rdev->bdev,b), | |
4477 | bdevname(rdev0->bdev,b2)); | |
4478 | export_rdev(rdev); | |
4479 | return -EINVAL; | |
4480 | } | |
4481 | } | |
4482 | err = bind_rdev_to_array(rdev, mddev); | |
4483 | if (err) | |
4484 | export_rdev(rdev); | |
4485 | return err; | |
4486 | } | |
4487 | ||
4488 | /* | |
4489 | * add_new_disk can be used once the array is assembled | |
4490 | * to add "hot spares". They must already have a superblock | |
4491 | * written | |
4492 | */ | |
4493 | if (mddev->pers) { | |
4494 | int err; | |
4495 | if (!mddev->pers->hot_add_disk) { | |
4496 | printk(KERN_WARNING | |
4497 | "%s: personality does not support diskops!\n", | |
4498 | mdname(mddev)); | |
4499 | return -EINVAL; | |
4500 | } | |
7b1e35f6 N |
4501 | if (mddev->persistent) |
4502 | rdev = md_import_device(dev, mddev->major_version, | |
4503 | mddev->minor_version); | |
4504 | else | |
4505 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4506 | if (IS_ERR(rdev)) { |
4507 | printk(KERN_WARNING | |
4508 | "md: md_import_device returned %ld\n", | |
4509 | PTR_ERR(rdev)); | |
4510 | return PTR_ERR(rdev); | |
4511 | } | |
41158c7e N |
4512 | /* set save_raid_disk if appropriate */ |
4513 | if (!mddev->persistent) { | |
4514 | if (info->state & (1<<MD_DISK_SYNC) && | |
4515 | info->raid_disk < mddev->raid_disks) | |
4516 | rdev->raid_disk = info->raid_disk; | |
4517 | else | |
4518 | rdev->raid_disk = -1; | |
4519 | } else | |
4520 | super_types[mddev->major_version]. | |
4521 | validate_super(mddev, rdev); | |
4522 | rdev->saved_raid_disk = rdev->raid_disk; | |
4523 | ||
b2d444d7 | 4524 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4525 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4526 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
4527 | else |
4528 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 4529 | |
1da177e4 LT |
4530 | rdev->raid_disk = -1; |
4531 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4532 | if (!err && !mddev->pers->hot_remove_disk) { |
4533 | /* If there is hot_add_disk but no hot_remove_disk | |
4534 | * then added disks for geometry changes, | |
4535 | * and should be added immediately. | |
4536 | */ | |
4537 | super_types[mddev->major_version]. | |
4538 | validate_super(mddev, rdev); | |
4539 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4540 | if (err) | |
4541 | unbind_rdev_from_array(rdev); | |
4542 | } | |
1da177e4 LT |
4543 | if (err) |
4544 | export_rdev(rdev); | |
52664732 | 4545 | else |
3c0ee63a | 4546 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4547 | |
17571284 | 4548 | md_update_sb(mddev, 1); |
72a23c21 NB |
4549 | if (mddev->degraded) |
4550 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4551 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4552 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4553 | return err; |
4554 | } | |
4555 | ||
4556 | /* otherwise, add_new_disk is only allowed | |
4557 | * for major_version==0 superblocks | |
4558 | */ | |
4559 | if (mddev->major_version != 0) { | |
4560 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4561 | mdname(mddev)); | |
4562 | return -EINVAL; | |
4563 | } | |
4564 | ||
4565 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4566 | int err; | |
d710e138 | 4567 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4568 | if (IS_ERR(rdev)) { |
4569 | printk(KERN_WARNING | |
4570 | "md: error, md_import_device() returned %ld\n", | |
4571 | PTR_ERR(rdev)); | |
4572 | return PTR_ERR(rdev); | |
4573 | } | |
4574 | rdev->desc_nr = info->number; | |
4575 | if (info->raid_disk < mddev->raid_disks) | |
4576 | rdev->raid_disk = info->raid_disk; | |
4577 | else | |
4578 | rdev->raid_disk = -1; | |
4579 | ||
1da177e4 | 4580 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4581 | if (info->state & (1<<MD_DISK_SYNC)) |
4582 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4583 | |
8ddf9efe N |
4584 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4585 | set_bit(WriteMostly, &rdev->flags); | |
4586 | ||
1da177e4 LT |
4587 | if (!mddev->persistent) { |
4588 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4589 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4590 | } else |
0f420358 | 4591 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
dd8ac336 | 4592 | rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size); |
1da177e4 | 4593 | |
2bf071bf N |
4594 | err = bind_rdev_to_array(rdev, mddev); |
4595 | if (err) { | |
4596 | export_rdev(rdev); | |
4597 | return err; | |
4598 | } | |
1da177e4 LT |
4599 | } |
4600 | ||
4601 | return 0; | |
4602 | } | |
4603 | ||
4604 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4605 | { | |
4606 | char b[BDEVNAME_SIZE]; | |
4607 | mdk_rdev_t *rdev; | |
4608 | ||
1da177e4 LT |
4609 | rdev = find_rdev(mddev, dev); |
4610 | if (!rdev) | |
4611 | return -ENXIO; | |
4612 | ||
4613 | if (rdev->raid_disk >= 0) | |
4614 | goto busy; | |
4615 | ||
4616 | kick_rdev_from_array(rdev); | |
850b2b42 | 4617 | md_update_sb(mddev, 1); |
d7603b7e | 4618 | md_new_event(mddev); |
1da177e4 LT |
4619 | |
4620 | return 0; | |
4621 | busy: | |
fdefa4d8 | 4622 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4623 | bdevname(rdev->bdev,b), mdname(mddev)); |
4624 | return -EBUSY; | |
4625 | } | |
4626 | ||
4627 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4628 | { | |
4629 | char b[BDEVNAME_SIZE]; | |
4630 | int err; | |
1da177e4 LT |
4631 | mdk_rdev_t *rdev; |
4632 | ||
4633 | if (!mddev->pers) | |
4634 | return -ENODEV; | |
4635 | ||
4636 | if (mddev->major_version != 0) { | |
4637 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4638 | " version-0 superblocks.\n", | |
4639 | mdname(mddev)); | |
4640 | return -EINVAL; | |
4641 | } | |
4642 | if (!mddev->pers->hot_add_disk) { | |
4643 | printk(KERN_WARNING | |
4644 | "%s: personality does not support diskops!\n", | |
4645 | mdname(mddev)); | |
4646 | return -EINVAL; | |
4647 | } | |
4648 | ||
d710e138 | 4649 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4650 | if (IS_ERR(rdev)) { |
4651 | printk(KERN_WARNING | |
4652 | "md: error, md_import_device() returned %ld\n", | |
4653 | PTR_ERR(rdev)); | |
4654 | return -EINVAL; | |
4655 | } | |
4656 | ||
4657 | if (mddev->persistent) | |
0f420358 | 4658 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4659 | else |
0f420358 | 4660 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4661 | |
dd8ac336 | 4662 | rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size); |
1da177e4 | 4663 | |
b2d444d7 | 4664 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4665 | printk(KERN_WARNING |
4666 | "md: can not hot-add faulty %s disk to %s!\n", | |
4667 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4668 | err = -EINVAL; | |
4669 | goto abort_export; | |
4670 | } | |
b2d444d7 | 4671 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4672 | rdev->desc_nr = -1; |
5842730d | 4673 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4674 | err = bind_rdev_to_array(rdev, mddev); |
4675 | if (err) | |
4676 | goto abort_export; | |
1da177e4 LT |
4677 | |
4678 | /* | |
4679 | * The rest should better be atomic, we can have disk failures | |
4680 | * noticed in interrupt contexts ... | |
4681 | */ | |
4682 | ||
1da177e4 LT |
4683 | rdev->raid_disk = -1; |
4684 | ||
850b2b42 | 4685 | md_update_sb(mddev, 1); |
1da177e4 LT |
4686 | |
4687 | /* | |
4688 | * Kick recovery, maybe this spare has to be added to the | |
4689 | * array immediately. | |
4690 | */ | |
4691 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4692 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4693 | md_new_event(mddev); |
1da177e4 LT |
4694 | return 0; |
4695 | ||
1da177e4 LT |
4696 | abort_export: |
4697 | export_rdev(rdev); | |
4698 | return err; | |
4699 | } | |
4700 | ||
32a7627c N |
4701 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4702 | { | |
4703 | int err; | |
4704 | ||
36fa3063 N |
4705 | if (mddev->pers) { |
4706 | if (!mddev->pers->quiesce) | |
4707 | return -EBUSY; | |
4708 | if (mddev->recovery || mddev->sync_thread) | |
4709 | return -EBUSY; | |
4710 | /* we should be able to change the bitmap.. */ | |
4711 | } | |
32a7627c | 4712 | |
32a7627c | 4713 | |
36fa3063 N |
4714 | if (fd >= 0) { |
4715 | if (mddev->bitmap) | |
4716 | return -EEXIST; /* cannot add when bitmap is present */ | |
4717 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4718 | |
36fa3063 N |
4719 | if (mddev->bitmap_file == NULL) { |
4720 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4721 | mdname(mddev)); | |
4722 | return -EBADF; | |
4723 | } | |
4724 | ||
4725 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4726 | if (err) { | |
4727 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4728 | mdname(mddev)); | |
4729 | fput(mddev->bitmap_file); | |
4730 | mddev->bitmap_file = NULL; | |
4731 | return err; | |
4732 | } | |
a654b9d8 | 4733 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4734 | } else if (mddev->bitmap == NULL) |
4735 | return -ENOENT; /* cannot remove what isn't there */ | |
4736 | err = 0; | |
4737 | if (mddev->pers) { | |
4738 | mddev->pers->quiesce(mddev, 1); | |
4739 | if (fd >= 0) | |
4740 | err = bitmap_create(mddev); | |
d7375ab3 | 4741 | if (fd < 0 || err) { |
36fa3063 | 4742 | bitmap_destroy(mddev); |
d7375ab3 N |
4743 | fd = -1; /* make sure to put the file */ |
4744 | } | |
36fa3063 | 4745 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4746 | } |
4747 | if (fd < 0) { | |
acc55e22 N |
4748 | if (mddev->bitmap_file) { |
4749 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4750 | fput(mddev->bitmap_file); |
acc55e22 | 4751 | } |
36fa3063 N |
4752 | mddev->bitmap_file = NULL; |
4753 | } | |
4754 | ||
32a7627c N |
4755 | return err; |
4756 | } | |
4757 | ||
1da177e4 LT |
4758 | /* |
4759 | * set_array_info is used two different ways | |
4760 | * The original usage is when creating a new array. | |
4761 | * In this usage, raid_disks is > 0 and it together with | |
4762 | * level, size, not_persistent,layout,chunksize determine the | |
4763 | * shape of the array. | |
4764 | * This will always create an array with a type-0.90.0 superblock. | |
4765 | * The newer usage is when assembling an array. | |
4766 | * In this case raid_disks will be 0, and the major_version field is | |
4767 | * use to determine which style super-blocks are to be found on the devices. | |
4768 | * The minor and patch _version numbers are also kept incase the | |
4769 | * super_block handler wishes to interpret them. | |
4770 | */ | |
4771 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
4772 | { | |
4773 | ||
4774 | if (info->raid_disks == 0) { | |
4775 | /* just setting version number for superblock loading */ | |
4776 | if (info->major_version < 0 || | |
50511da3 | 4777 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
4778 | super_types[info->major_version].name == NULL) { |
4779 | /* maybe try to auto-load a module? */ | |
4780 | printk(KERN_INFO | |
4781 | "md: superblock version %d not known\n", | |
4782 | info->major_version); | |
4783 | return -EINVAL; | |
4784 | } | |
4785 | mddev->major_version = info->major_version; | |
4786 | mddev->minor_version = info->minor_version; | |
4787 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 4788 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
4789 | return 0; |
4790 | } | |
4791 | mddev->major_version = MD_MAJOR_VERSION; | |
4792 | mddev->minor_version = MD_MINOR_VERSION; | |
4793 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
4794 | mddev->ctime = get_seconds(); | |
4795 | ||
4796 | mddev->level = info->level; | |
17115e03 | 4797 | mddev->clevel[0] = 0; |
58c0fed4 | 4798 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
4799 | mddev->raid_disks = info->raid_disks; |
4800 | /* don't set md_minor, it is determined by which /dev/md* was | |
4801 | * openned | |
4802 | */ | |
4803 | if (info->state & (1<<MD_SB_CLEAN)) | |
4804 | mddev->recovery_cp = MaxSector; | |
4805 | else | |
4806 | mddev->recovery_cp = 0; | |
4807 | mddev->persistent = ! info->not_persistent; | |
e691063a | 4808 | mddev->external = 0; |
1da177e4 LT |
4809 | |
4810 | mddev->layout = info->layout; | |
4811 | mddev->chunk_size = info->chunk_size; | |
4812 | ||
4813 | mddev->max_disks = MD_SB_DISKS; | |
4814 | ||
e691063a N |
4815 | if (mddev->persistent) |
4816 | mddev->flags = 0; | |
850b2b42 | 4817 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 4818 | |
b2a2703c N |
4819 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
4820 | mddev->bitmap_offset = 0; | |
4821 | ||
f6705578 N |
4822 | mddev->reshape_position = MaxSector; |
4823 | ||
1da177e4 LT |
4824 | /* |
4825 | * Generate a 128 bit UUID | |
4826 | */ | |
4827 | get_random_bytes(mddev->uuid, 16); | |
4828 | ||
f6705578 N |
4829 | mddev->new_level = mddev->level; |
4830 | mddev->new_chunk = mddev->chunk_size; | |
4831 | mddev->new_layout = mddev->layout; | |
4832 | mddev->delta_disks = 0; | |
4833 | ||
1da177e4 LT |
4834 | return 0; |
4835 | } | |
4836 | ||
d71f9f88 | 4837 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 4838 | { |
159ec1fc | 4839 | mdk_rdev_t *rdev; |
a35b0d69 | 4840 | int rv; |
d71f9f88 | 4841 | int fit = (num_sectors == 0); |
a35b0d69 N |
4842 | |
4843 | if (mddev->pers->resize == NULL) | |
4844 | return -EINVAL; | |
d71f9f88 AN |
4845 | /* The "num_sectors" is the number of sectors of each device that |
4846 | * is used. This can only make sense for arrays with redundancy. | |
4847 | * linear and raid0 always use whatever space is available. We can only | |
4848 | * consider changing this number if no resync or reconstruction is | |
4849 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 4850 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
4851 | * of each device. If num_sectors is zero, we find the largest size |
4852 | * that fits. | |
4853 | ||
a35b0d69 N |
4854 | */ |
4855 | if (mddev->sync_thread) | |
4856 | return -EBUSY; | |
dba034ee N |
4857 | if (mddev->bitmap) |
4858 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
4859 | * grow, and re-add. | |
4860 | */ | |
4861 | return -EBUSY; | |
159ec1fc | 4862 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 4863 | sector_t avail = rdev->sectors; |
01ab5662 | 4864 | |
d71f9f88 AN |
4865 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
4866 | num_sectors = avail; | |
4867 | if (avail < num_sectors) | |
a35b0d69 N |
4868 | return -ENOSPC; |
4869 | } | |
d71f9f88 | 4870 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
4871 | if (!rv) { |
4872 | struct block_device *bdev; | |
4873 | ||
4874 | bdev = bdget_disk(mddev->gendisk, 0); | |
4875 | if (bdev) { | |
1b1dcc1b | 4876 | mutex_lock(&bdev->bd_inode->i_mutex); |
f233ea5c AN |
4877 | i_size_write(bdev->bd_inode, |
4878 | (loff_t)mddev->array_sectors << 9); | |
1b1dcc1b | 4879 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
4880 | bdput(bdev); |
4881 | } | |
4882 | } | |
4883 | return rv; | |
4884 | } | |
4885 | ||
da943b99 N |
4886 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
4887 | { | |
4888 | int rv; | |
4889 | /* change the number of raid disks */ | |
63c70c4f | 4890 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
4891 | return -EINVAL; |
4892 | if (raid_disks <= 0 || | |
4893 | raid_disks >= mddev->max_disks) | |
4894 | return -EINVAL; | |
63c70c4f | 4895 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 4896 | return -EBUSY; |
63c70c4f N |
4897 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
4898 | ||
4899 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
4900 | return rv; |
4901 | } | |
4902 | ||
4903 | ||
1da177e4 LT |
4904 | /* |
4905 | * update_array_info is used to change the configuration of an | |
4906 | * on-line array. | |
4907 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
4908 | * fields in the info are checked against the array. | |
4909 | * Any differences that cannot be handled will cause an error. | |
4910 | * Normally, only one change can be managed at a time. | |
4911 | */ | |
4912 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
4913 | { | |
4914 | int rv = 0; | |
4915 | int cnt = 0; | |
36fa3063 N |
4916 | int state = 0; |
4917 | ||
4918 | /* calculate expected state,ignoring low bits */ | |
4919 | if (mddev->bitmap && mddev->bitmap_offset) | |
4920 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4921 | |
4922 | if (mddev->major_version != info->major_version || | |
4923 | mddev->minor_version != info->minor_version || | |
4924 | /* mddev->patch_version != info->patch_version || */ | |
4925 | mddev->ctime != info->ctime || | |
4926 | mddev->level != info->level || | |
4927 | /* mddev->layout != info->layout || */ | |
4928 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
4929 | mddev->chunk_size != info->chunk_size || |
4930 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
4931 | ((state^info->state) & 0xfffffe00) | |
4932 | ) | |
1da177e4 LT |
4933 | return -EINVAL; |
4934 | /* Check there is only one change */ | |
58c0fed4 AN |
4935 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
4936 | cnt++; | |
4937 | if (mddev->raid_disks != info->raid_disks) | |
4938 | cnt++; | |
4939 | if (mddev->layout != info->layout) | |
4940 | cnt++; | |
4941 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
4942 | cnt++; | |
4943 | if (cnt == 0) | |
4944 | return 0; | |
4945 | if (cnt > 1) | |
4946 | return -EINVAL; | |
1da177e4 LT |
4947 | |
4948 | if (mddev->layout != info->layout) { | |
4949 | /* Change layout | |
4950 | * we don't need to do anything at the md level, the | |
4951 | * personality will take care of it all. | |
4952 | */ | |
4953 | if (mddev->pers->reconfig == NULL) | |
4954 | return -EINVAL; | |
4955 | else | |
4956 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
4957 | } | |
58c0fed4 | 4958 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 4959 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 4960 | |
da943b99 N |
4961 | if (mddev->raid_disks != info->raid_disks) |
4962 | rv = update_raid_disks(mddev, info->raid_disks); | |
4963 | ||
36fa3063 N |
4964 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
4965 | if (mddev->pers->quiesce == NULL) | |
4966 | return -EINVAL; | |
4967 | if (mddev->recovery || mddev->sync_thread) | |
4968 | return -EBUSY; | |
4969 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
4970 | /* add the bitmap */ | |
4971 | if (mddev->bitmap) | |
4972 | return -EEXIST; | |
4973 | if (mddev->default_bitmap_offset == 0) | |
4974 | return -EINVAL; | |
4975 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
4976 | mddev->pers->quiesce(mddev, 1); | |
4977 | rv = bitmap_create(mddev); | |
4978 | if (rv) | |
4979 | bitmap_destroy(mddev); | |
4980 | mddev->pers->quiesce(mddev, 0); | |
4981 | } else { | |
4982 | /* remove the bitmap */ | |
4983 | if (!mddev->bitmap) | |
4984 | return -ENOENT; | |
4985 | if (mddev->bitmap->file) | |
4986 | return -EINVAL; | |
4987 | mddev->pers->quiesce(mddev, 1); | |
4988 | bitmap_destroy(mddev); | |
4989 | mddev->pers->quiesce(mddev, 0); | |
4990 | mddev->bitmap_offset = 0; | |
4991 | } | |
4992 | } | |
850b2b42 | 4993 | md_update_sb(mddev, 1); |
1da177e4 LT |
4994 | return rv; |
4995 | } | |
4996 | ||
4997 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
4998 | { | |
4999 | mdk_rdev_t *rdev; | |
5000 | ||
5001 | if (mddev->pers == NULL) | |
5002 | return -ENODEV; | |
5003 | ||
5004 | rdev = find_rdev(mddev, dev); | |
5005 | if (!rdev) | |
5006 | return -ENODEV; | |
5007 | ||
5008 | md_error(mddev, rdev); | |
5009 | return 0; | |
5010 | } | |
5011 | ||
2f9618ce AN |
5012 | /* |
5013 | * We have a problem here : there is no easy way to give a CHS | |
5014 | * virtual geometry. We currently pretend that we have a 2 heads | |
5015 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5016 | * dosfs just mad... ;-) | |
5017 | */ | |
a885c8c4 CH |
5018 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5019 | { | |
5020 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5021 | ||
5022 | geo->heads = 2; | |
5023 | geo->sectors = 4; | |
5024 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
5025 | return 0; | |
5026 | } | |
5027 | ||
a39907fa | 5028 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5029 | unsigned int cmd, unsigned long arg) |
5030 | { | |
5031 | int err = 0; | |
5032 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
5033 | mddev_t *mddev = NULL; |
5034 | ||
5035 | if (!capable(CAP_SYS_ADMIN)) | |
5036 | return -EACCES; | |
5037 | ||
5038 | /* | |
5039 | * Commands dealing with the RAID driver but not any | |
5040 | * particular array: | |
5041 | */ | |
5042 | switch (cmd) | |
5043 | { | |
5044 | case RAID_VERSION: | |
5045 | err = get_version(argp); | |
5046 | goto done; | |
5047 | ||
5048 | case PRINT_RAID_DEBUG: | |
5049 | err = 0; | |
5050 | md_print_devices(); | |
5051 | goto done; | |
5052 | ||
5053 | #ifndef MODULE | |
5054 | case RAID_AUTORUN: | |
5055 | err = 0; | |
5056 | autostart_arrays(arg); | |
5057 | goto done; | |
5058 | #endif | |
5059 | default:; | |
5060 | } | |
5061 | ||
5062 | /* | |
5063 | * Commands creating/starting a new array: | |
5064 | */ | |
5065 | ||
a39907fa | 5066 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5067 | |
5068 | if (!mddev) { | |
5069 | BUG(); | |
5070 | goto abort; | |
5071 | } | |
5072 | ||
1da177e4 LT |
5073 | err = mddev_lock(mddev); |
5074 | if (err) { | |
5075 | printk(KERN_INFO | |
5076 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5077 | err, cmd); | |
5078 | goto abort; | |
5079 | } | |
5080 | ||
5081 | switch (cmd) | |
5082 | { | |
5083 | case SET_ARRAY_INFO: | |
5084 | { | |
5085 | mdu_array_info_t info; | |
5086 | if (!arg) | |
5087 | memset(&info, 0, sizeof(info)); | |
5088 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5089 | err = -EFAULT; | |
5090 | goto abort_unlock; | |
5091 | } | |
5092 | if (mddev->pers) { | |
5093 | err = update_array_info(mddev, &info); | |
5094 | if (err) { | |
5095 | printk(KERN_WARNING "md: couldn't update" | |
5096 | " array info. %d\n", err); | |
5097 | goto abort_unlock; | |
5098 | } | |
5099 | goto done_unlock; | |
5100 | } | |
5101 | if (!list_empty(&mddev->disks)) { | |
5102 | printk(KERN_WARNING | |
5103 | "md: array %s already has disks!\n", | |
5104 | mdname(mddev)); | |
5105 | err = -EBUSY; | |
5106 | goto abort_unlock; | |
5107 | } | |
5108 | if (mddev->raid_disks) { | |
5109 | printk(KERN_WARNING | |
5110 | "md: array %s already initialised!\n", | |
5111 | mdname(mddev)); | |
5112 | err = -EBUSY; | |
5113 | goto abort_unlock; | |
5114 | } | |
5115 | err = set_array_info(mddev, &info); | |
5116 | if (err) { | |
5117 | printk(KERN_WARNING "md: couldn't set" | |
5118 | " array info. %d\n", err); | |
5119 | goto abort_unlock; | |
5120 | } | |
5121 | } | |
5122 | goto done_unlock; | |
5123 | ||
5124 | default:; | |
5125 | } | |
5126 | ||
5127 | /* | |
5128 | * Commands querying/configuring an existing array: | |
5129 | */ | |
32a7627c | 5130 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5131 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5132 | if ((!mddev->raid_disks && !mddev->external) |
5133 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5134 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5135 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5136 | err = -ENODEV; |
5137 | goto abort_unlock; | |
5138 | } | |
5139 | ||
5140 | /* | |
5141 | * Commands even a read-only array can execute: | |
5142 | */ | |
5143 | switch (cmd) | |
5144 | { | |
5145 | case GET_ARRAY_INFO: | |
5146 | err = get_array_info(mddev, argp); | |
5147 | goto done_unlock; | |
5148 | ||
32a7627c | 5149 | case GET_BITMAP_FILE: |
87162a28 | 5150 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5151 | goto done_unlock; |
5152 | ||
1da177e4 LT |
5153 | case GET_DISK_INFO: |
5154 | err = get_disk_info(mddev, argp); | |
5155 | goto done_unlock; | |
5156 | ||
5157 | case RESTART_ARRAY_RW: | |
5158 | err = restart_array(mddev); | |
5159 | goto done_unlock; | |
5160 | ||
5161 | case STOP_ARRAY: | |
d710e138 | 5162 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5163 | goto done_unlock; |
5164 | ||
5165 | case STOP_ARRAY_RO: | |
d710e138 | 5166 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
5167 | goto done_unlock; |
5168 | ||
1da177e4 LT |
5169 | } |
5170 | ||
5171 | /* | |
5172 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5173 | * superblock, so we do not allow them on read-only arrays. |
5174 | * However non-MD ioctls (e.g. get-size) will still come through | |
5175 | * here and hit the 'default' below, so only disallow | |
5176 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5177 | */ |
bb57fc64 | 5178 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5179 | if (mddev->ro == 2) { |
5180 | mddev->ro = 0; | |
b62b7590 | 5181 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5182 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5183 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5184 | } else { |
5185 | err = -EROFS; | |
5186 | goto abort_unlock; | |
5187 | } | |
1da177e4 LT |
5188 | } |
5189 | ||
5190 | switch (cmd) | |
5191 | { | |
5192 | case ADD_NEW_DISK: | |
5193 | { | |
5194 | mdu_disk_info_t info; | |
5195 | if (copy_from_user(&info, argp, sizeof(info))) | |
5196 | err = -EFAULT; | |
5197 | else | |
5198 | err = add_new_disk(mddev, &info); | |
5199 | goto done_unlock; | |
5200 | } | |
5201 | ||
5202 | case HOT_REMOVE_DISK: | |
5203 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5204 | goto done_unlock; | |
5205 | ||
5206 | case HOT_ADD_DISK: | |
5207 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5208 | goto done_unlock; | |
5209 | ||
5210 | case SET_DISK_FAULTY: | |
5211 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5212 | goto done_unlock; | |
5213 | ||
5214 | case RUN_ARRAY: | |
d710e138 | 5215 | err = do_md_run(mddev); |
1da177e4 LT |
5216 | goto done_unlock; |
5217 | ||
32a7627c N |
5218 | case SET_BITMAP_FILE: |
5219 | err = set_bitmap_file(mddev, (int)arg); | |
5220 | goto done_unlock; | |
5221 | ||
1da177e4 | 5222 | default: |
1da177e4 LT |
5223 | err = -EINVAL; |
5224 | goto abort_unlock; | |
5225 | } | |
5226 | ||
5227 | done_unlock: | |
5228 | abort_unlock: | |
d3374825 N |
5229 | if (mddev->hold_active == UNTIL_IOCTL && |
5230 | err != -EINVAL) | |
5231 | mddev->hold_active = 0; | |
1da177e4 LT |
5232 | mddev_unlock(mddev); |
5233 | ||
5234 | return err; | |
5235 | done: | |
5236 | if (err) | |
5237 | MD_BUG(); | |
5238 | abort: | |
5239 | return err; | |
5240 | } | |
5241 | ||
a39907fa | 5242 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5243 | { |
5244 | /* | |
5245 | * Succeed if we can lock the mddev, which confirms that | |
5246 | * it isn't being stopped right now. | |
5247 | */ | |
d3374825 | 5248 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5249 | int err; |
5250 | ||
d3374825 N |
5251 | if (mddev->gendisk != bdev->bd_disk) { |
5252 | /* we are racing with mddev_put which is discarding this | |
5253 | * bd_disk. | |
5254 | */ | |
5255 | mddev_put(mddev); | |
5256 | /* Wait until bdev->bd_disk is definitely gone */ | |
5257 | flush_scheduled_work(); | |
5258 | /* Then retry the open from the top */ | |
5259 | return -ERESTARTSYS; | |
5260 | } | |
5261 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5262 | ||
d63a5a74 | 5263 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5264 | goto out; |
5265 | ||
5266 | err = 0; | |
f2ea68cf | 5267 | atomic_inc(&mddev->openers); |
1da177e4 LT |
5268 | mddev_unlock(mddev); |
5269 | ||
a39907fa | 5270 | check_disk_change(bdev); |
1da177e4 LT |
5271 | out: |
5272 | return err; | |
5273 | } | |
5274 | ||
a39907fa | 5275 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5276 | { |
a39907fa | 5277 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5278 | |
52e5f9d1 | 5279 | BUG_ON(!mddev); |
f2ea68cf | 5280 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5281 | mddev_put(mddev); |
5282 | ||
5283 | return 0; | |
5284 | } | |
5285 | ||
44ce6294 LT |
5286 | static int md_media_changed(struct gendisk *disk) |
5287 | { | |
5288 | mddev_t *mddev = disk->private_data; | |
5289 | ||
5290 | return mddev->changed; | |
5291 | } | |
5292 | ||
5293 | static int md_revalidate(struct gendisk *disk) | |
5294 | { | |
5295 | mddev_t *mddev = disk->private_data; | |
5296 | ||
5297 | mddev->changed = 0; | |
5298 | return 0; | |
5299 | } | |
1da177e4 LT |
5300 | static struct block_device_operations md_fops = |
5301 | { | |
5302 | .owner = THIS_MODULE, | |
a39907fa AV |
5303 | .open = md_open, |
5304 | .release = md_release, | |
5305 | .locked_ioctl = md_ioctl, | |
a885c8c4 | 5306 | .getgeo = md_getgeo, |
44ce6294 LT |
5307 | .media_changed = md_media_changed, |
5308 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5309 | }; |
5310 | ||
75c96f85 | 5311 | static int md_thread(void * arg) |
1da177e4 LT |
5312 | { |
5313 | mdk_thread_t *thread = arg; | |
5314 | ||
1da177e4 LT |
5315 | /* |
5316 | * md_thread is a 'system-thread', it's priority should be very | |
5317 | * high. We avoid resource deadlocks individually in each | |
5318 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5319 | * the very same RT priority as kswapd, thus we will never get | |
5320 | * into a priority inversion deadlock. | |
5321 | * | |
5322 | * we definitely have to have equal or higher priority than | |
5323 | * bdflush, otherwise bdflush will deadlock if there are too | |
5324 | * many dirty RAID5 blocks. | |
5325 | */ | |
1da177e4 | 5326 | |
6985c43f | 5327 | allow_signal(SIGKILL); |
a6fb0934 | 5328 | while (!kthread_should_stop()) { |
1da177e4 | 5329 | |
93588e22 N |
5330 | /* We need to wait INTERRUPTIBLE so that |
5331 | * we don't add to the load-average. | |
5332 | * That means we need to be sure no signals are | |
5333 | * pending | |
5334 | */ | |
5335 | if (signal_pending(current)) | |
5336 | flush_signals(current); | |
5337 | ||
5338 | wait_event_interruptible_timeout | |
5339 | (thread->wqueue, | |
5340 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5341 | || kthread_should_stop(), | |
5342 | thread->timeout); | |
1da177e4 LT |
5343 | |
5344 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5345 | ||
787453c2 | 5346 | thread->run(thread->mddev); |
1da177e4 | 5347 | } |
a6fb0934 | 5348 | |
1da177e4 LT |
5349 | return 0; |
5350 | } | |
5351 | ||
5352 | void md_wakeup_thread(mdk_thread_t *thread) | |
5353 | { | |
5354 | if (thread) { | |
5355 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5356 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5357 | wake_up(&thread->wqueue); | |
5358 | } | |
5359 | } | |
5360 | ||
5361 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5362 | const char *name) | |
5363 | { | |
5364 | mdk_thread_t *thread; | |
1da177e4 | 5365 | |
9ffae0cf | 5366 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5367 | if (!thread) |
5368 | return NULL; | |
5369 | ||
1da177e4 LT |
5370 | init_waitqueue_head(&thread->wqueue); |
5371 | ||
1da177e4 LT |
5372 | thread->run = run; |
5373 | thread->mddev = mddev; | |
32a7627c | 5374 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5375 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5376 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5377 | kfree(thread); |
5378 | return NULL; | |
5379 | } | |
1da177e4 LT |
5380 | return thread; |
5381 | } | |
5382 | ||
1da177e4 LT |
5383 | void md_unregister_thread(mdk_thread_t *thread) |
5384 | { | |
e0cf8f04 N |
5385 | if (!thread) |
5386 | return; | |
ba25f9dc | 5387 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5388 | |
5389 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5390 | kfree(thread); |
5391 | } | |
5392 | ||
5393 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5394 | { | |
5395 | if (!mddev) { | |
5396 | MD_BUG(); | |
5397 | return; | |
5398 | } | |
5399 | ||
b2d444d7 | 5400 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5401 | return; |
6bfe0b49 DW |
5402 | |
5403 | if (mddev->external) | |
5404 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5405 | /* |
1da177e4 LT |
5406 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5407 | mdname(mddev), | |
5408 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5409 | __builtin_return_address(0),__builtin_return_address(1), | |
5410 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5411 | */ |
d0a0a5ee AM |
5412 | if (!mddev->pers) |
5413 | return; | |
1da177e4 LT |
5414 | if (!mddev->pers->error_handler) |
5415 | return; | |
5416 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5417 | if (mddev->degraded) |
5418 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5419 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5420 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5421 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5422 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5423 | md_new_event_inintr(mddev); |
1da177e4 LT |
5424 | } |
5425 | ||
5426 | /* seq_file implementation /proc/mdstat */ | |
5427 | ||
5428 | static void status_unused(struct seq_file *seq) | |
5429 | { | |
5430 | int i = 0; | |
5431 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5432 | |
5433 | seq_printf(seq, "unused devices: "); | |
5434 | ||
159ec1fc | 5435 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5436 | char b[BDEVNAME_SIZE]; |
5437 | i++; | |
5438 | seq_printf(seq, "%s ", | |
5439 | bdevname(rdev->bdev,b)); | |
5440 | } | |
5441 | if (!i) | |
5442 | seq_printf(seq, "<none>"); | |
5443 | ||
5444 | seq_printf(seq, "\n"); | |
5445 | } | |
5446 | ||
5447 | ||
5448 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5449 | { | |
4588b42e N |
5450 | sector_t max_blocks, resync, res; |
5451 | unsigned long dt, db, rt; | |
5452 | int scale; | |
5453 | unsigned int per_milli; | |
1da177e4 LT |
5454 | |
5455 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
5456 | ||
5457 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5458 | max_blocks = mddev->resync_max_sectors >> 1; | |
5459 | else | |
58c0fed4 | 5460 | max_blocks = mddev->dev_sectors / 2; |
1da177e4 LT |
5461 | |
5462 | /* | |
5463 | * Should not happen. | |
5464 | */ | |
5465 | if (!max_blocks) { | |
5466 | MD_BUG(); | |
5467 | return; | |
5468 | } | |
4588b42e N |
5469 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
5470 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
5471 | * u32, as those are the requirements for sector_div. | |
5472 | * Thus 'scale' must be at least 10 | |
5473 | */ | |
5474 | scale = 10; | |
5475 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5476 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
5477 | scale++; | |
5478 | } | |
5479 | res = (resync>>scale)*1000; | |
5480 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
5481 | ||
5482 | per_milli = res; | |
1da177e4 | 5483 | { |
4588b42e | 5484 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5485 | seq_printf(seq, "["); |
5486 | for (i = 0; i < x; i++) | |
5487 | seq_printf(seq, "="); | |
5488 | seq_printf(seq, ">"); | |
5489 | for (i = 0; i < y; i++) | |
5490 | seq_printf(seq, "."); | |
5491 | seq_printf(seq, "] "); | |
5492 | } | |
4588b42e | 5493 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5494 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5495 | "reshape" : | |
61df9d91 N |
5496 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5497 | "check" : | |
5498 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5499 | "resync" : "recovery"))), | |
5500 | per_milli/10, per_milli % 10, | |
4588b42e N |
5501 | (unsigned long long) resync, |
5502 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5503 | |
5504 | /* | |
5505 | * We do not want to overflow, so the order of operands and | |
5506 | * the * 100 / 100 trick are important. We do a +1 to be | |
5507 | * safe against division by zero. We only estimate anyway. | |
5508 | * | |
5509 | * dt: time from mark until now | |
5510 | * db: blocks written from mark until now | |
5511 | * rt: remaining time | |
5512 | */ | |
5513 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5514 | if (!dt) dt++; | |
ff4e8d9a N |
5515 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5516 | - mddev->resync_mark_cnt; | |
5517 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5518 | |
5519 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5520 | ||
ff4e8d9a | 5521 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5522 | } |
5523 | ||
5524 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5525 | { | |
5526 | struct list_head *tmp; | |
5527 | loff_t l = *pos; | |
5528 | mddev_t *mddev; | |
5529 | ||
5530 | if (l >= 0x10000) | |
5531 | return NULL; | |
5532 | if (!l--) | |
5533 | /* header */ | |
5534 | return (void*)1; | |
5535 | ||
5536 | spin_lock(&all_mddevs_lock); | |
5537 | list_for_each(tmp,&all_mddevs) | |
5538 | if (!l--) { | |
5539 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5540 | mddev_get(mddev); | |
5541 | spin_unlock(&all_mddevs_lock); | |
5542 | return mddev; | |
5543 | } | |
5544 | spin_unlock(&all_mddevs_lock); | |
5545 | if (!l--) | |
5546 | return (void*)2;/* tail */ | |
5547 | return NULL; | |
5548 | } | |
5549 | ||
5550 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5551 | { | |
5552 | struct list_head *tmp; | |
5553 | mddev_t *next_mddev, *mddev = v; | |
5554 | ||
5555 | ++*pos; | |
5556 | if (v == (void*)2) | |
5557 | return NULL; | |
5558 | ||
5559 | spin_lock(&all_mddevs_lock); | |
5560 | if (v == (void*)1) | |
5561 | tmp = all_mddevs.next; | |
5562 | else | |
5563 | tmp = mddev->all_mddevs.next; | |
5564 | if (tmp != &all_mddevs) | |
5565 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5566 | else { | |
5567 | next_mddev = (void*)2; | |
5568 | *pos = 0x10000; | |
5569 | } | |
5570 | spin_unlock(&all_mddevs_lock); | |
5571 | ||
5572 | if (v != (void*)1) | |
5573 | mddev_put(mddev); | |
5574 | return next_mddev; | |
5575 | ||
5576 | } | |
5577 | ||
5578 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5579 | { | |
5580 | mddev_t *mddev = v; | |
5581 | ||
5582 | if (mddev && v != (void*)1 && v != (void*)2) | |
5583 | mddev_put(mddev); | |
5584 | } | |
5585 | ||
d7603b7e N |
5586 | struct mdstat_info { |
5587 | int event; | |
5588 | }; | |
5589 | ||
1da177e4 LT |
5590 | static int md_seq_show(struct seq_file *seq, void *v) |
5591 | { | |
5592 | mddev_t *mddev = v; | |
dd8ac336 | 5593 | sector_t sectors; |
1da177e4 | 5594 | mdk_rdev_t *rdev; |
d7603b7e | 5595 | struct mdstat_info *mi = seq->private; |
32a7627c | 5596 | struct bitmap *bitmap; |
1da177e4 LT |
5597 | |
5598 | if (v == (void*)1) { | |
2604b703 | 5599 | struct mdk_personality *pers; |
1da177e4 LT |
5600 | seq_printf(seq, "Personalities : "); |
5601 | spin_lock(&pers_lock); | |
2604b703 N |
5602 | list_for_each_entry(pers, &pers_list, list) |
5603 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5604 | |
5605 | spin_unlock(&pers_lock); | |
5606 | seq_printf(seq, "\n"); | |
d7603b7e | 5607 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5608 | return 0; |
5609 | } | |
5610 | if (v == (void*)2) { | |
5611 | status_unused(seq); | |
5612 | return 0; | |
5613 | } | |
5614 | ||
5dc5cf7d | 5615 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5616 | return -EINTR; |
5dc5cf7d | 5617 | |
1da177e4 LT |
5618 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5619 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5620 | mddev->pers ? "" : "in"); | |
5621 | if (mddev->pers) { | |
f91de92e | 5622 | if (mddev->ro==1) |
1da177e4 | 5623 | seq_printf(seq, " (read-only)"); |
f91de92e | 5624 | if (mddev->ro==2) |
52720ae7 | 5625 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5626 | seq_printf(seq, " %s", mddev->pers->name); |
5627 | } | |
5628 | ||
dd8ac336 | 5629 | sectors = 0; |
159ec1fc | 5630 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5631 | char b[BDEVNAME_SIZE]; |
5632 | seq_printf(seq, " %s[%d]", | |
5633 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5634 | if (test_bit(WriteMostly, &rdev->flags)) |
5635 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5636 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5637 | seq_printf(seq, "(F)"); |
5638 | continue; | |
b325a32e N |
5639 | } else if (rdev->raid_disk < 0) |
5640 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 5641 | sectors += rdev->sectors; |
1da177e4 LT |
5642 | } |
5643 | ||
5644 | if (!list_empty(&mddev->disks)) { | |
5645 | if (mddev->pers) | |
5646 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
5647 | (unsigned long long) |
5648 | mddev->array_sectors / 2); | |
1da177e4 LT |
5649 | else |
5650 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 5651 | (unsigned long long)sectors / 2); |
1da177e4 | 5652 | } |
1cd6bf19 N |
5653 | if (mddev->persistent) { |
5654 | if (mddev->major_version != 0 || | |
5655 | mddev->minor_version != 90) { | |
5656 | seq_printf(seq," super %d.%d", | |
5657 | mddev->major_version, | |
5658 | mddev->minor_version); | |
5659 | } | |
e691063a N |
5660 | } else if (mddev->external) |
5661 | seq_printf(seq, " super external:%s", | |
5662 | mddev->metadata_type); | |
5663 | else | |
1cd6bf19 | 5664 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5665 | |
5666 | if (mddev->pers) { | |
d710e138 | 5667 | mddev->pers->status(seq, mddev); |
1da177e4 | 5668 | seq_printf(seq, "\n "); |
8e1b39d6 N |
5669 | if (mddev->pers->sync_request) { |
5670 | if (mddev->curr_resync > 2) { | |
d710e138 | 5671 | status_resync(seq, mddev); |
8e1b39d6 N |
5672 | seq_printf(seq, "\n "); |
5673 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5674 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5675 | else if (mddev->recovery_cp < MaxSector) | |
5676 | seq_printf(seq, "\tresync=PENDING\n "); | |
5677 | } | |
32a7627c N |
5678 | } else |
5679 | seq_printf(seq, "\n "); | |
5680 | ||
5681 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5682 | unsigned long chunk_kb; |
5683 | unsigned long flags; | |
32a7627c N |
5684 | spin_lock_irqsave(&bitmap->lock, flags); |
5685 | chunk_kb = bitmap->chunksize >> 10; | |
5686 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5687 | "%lu%s chunk", | |
5688 | bitmap->pages - bitmap->missing_pages, | |
5689 | bitmap->pages, | |
5690 | (bitmap->pages - bitmap->missing_pages) | |
5691 | << (PAGE_SHIFT - 10), | |
5692 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5693 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5694 | if (bitmap->file) { |
5695 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5696 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5697 | } |
78d742d8 | 5698 | |
32a7627c N |
5699 | seq_printf(seq, "\n"); |
5700 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5701 | } |
5702 | ||
5703 | seq_printf(seq, "\n"); | |
5704 | } | |
5705 | mddev_unlock(mddev); | |
5706 | ||
5707 | return 0; | |
5708 | } | |
5709 | ||
5710 | static struct seq_operations md_seq_ops = { | |
5711 | .start = md_seq_start, | |
5712 | .next = md_seq_next, | |
5713 | .stop = md_seq_stop, | |
5714 | .show = md_seq_show, | |
5715 | }; | |
5716 | ||
5717 | static int md_seq_open(struct inode *inode, struct file *file) | |
5718 | { | |
5719 | int error; | |
d7603b7e N |
5720 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5721 | if (mi == NULL) | |
5722 | return -ENOMEM; | |
1da177e4 LT |
5723 | |
5724 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5725 | if (error) |
5726 | kfree(mi); | |
5727 | else { | |
5728 | struct seq_file *p = file->private_data; | |
5729 | p->private = mi; | |
5730 | mi->event = atomic_read(&md_event_count); | |
5731 | } | |
1da177e4 LT |
5732 | return error; |
5733 | } | |
5734 | ||
d7603b7e N |
5735 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5736 | { | |
5737 | struct seq_file *m = filp->private_data; | |
5738 | struct mdstat_info *mi = m->private; | |
5739 | int mask; | |
5740 | ||
5741 | poll_wait(filp, &md_event_waiters, wait); | |
5742 | ||
5743 | /* always allow read */ | |
5744 | mask = POLLIN | POLLRDNORM; | |
5745 | ||
5746 | if (mi->event != atomic_read(&md_event_count)) | |
5747 | mask |= POLLERR | POLLPRI; | |
5748 | return mask; | |
5749 | } | |
5750 | ||
fa027c2a | 5751 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5752 | .owner = THIS_MODULE, |
1da177e4 LT |
5753 | .open = md_seq_open, |
5754 | .read = seq_read, | |
5755 | .llseek = seq_lseek, | |
c3f94b40 | 5756 | .release = seq_release_private, |
d7603b7e | 5757 | .poll = mdstat_poll, |
1da177e4 LT |
5758 | }; |
5759 | ||
2604b703 | 5760 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 5761 | { |
1da177e4 | 5762 | spin_lock(&pers_lock); |
2604b703 N |
5763 | list_add_tail(&p->list, &pers_list); |
5764 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
5765 | spin_unlock(&pers_lock); |
5766 | return 0; | |
5767 | } | |
5768 | ||
2604b703 | 5769 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 5770 | { |
2604b703 | 5771 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 5772 | spin_lock(&pers_lock); |
2604b703 | 5773 | list_del_init(&p->list); |
1da177e4 LT |
5774 | spin_unlock(&pers_lock); |
5775 | return 0; | |
5776 | } | |
5777 | ||
eea1bf38 | 5778 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
5779 | { |
5780 | mdk_rdev_t * rdev; | |
1da177e4 | 5781 | int idle; |
eea1bf38 | 5782 | int curr_events; |
1da177e4 LT |
5783 | |
5784 | idle = 1; | |
4b80991c N |
5785 | rcu_read_lock(); |
5786 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5787 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
5788 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
5789 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
5790 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
5791 | /* sync IO will cause sync_io to increase before the disk_stats |
5792 | * as sync_io is counted when a request starts, and | |
5793 | * disk_stats is counted when it completes. | |
5794 | * So resync activity will cause curr_events to be smaller than | |
5795 | * when there was no such activity. | |
5796 | * non-sync IO will cause disk_stat to increase without | |
5797 | * increasing sync_io so curr_events will (eventually) | |
5798 | * be larger than it was before. Once it becomes | |
5799 | * substantially larger, the test below will cause | |
5800 | * the array to appear non-idle, and resync will slow | |
5801 | * down. | |
5802 | * If there is a lot of outstanding resync activity when | |
5803 | * we set last_event to curr_events, then all that activity | |
5804 | * completing might cause the array to appear non-idle | |
5805 | * and resync will be slowed down even though there might | |
5806 | * not have been non-resync activity. This will only | |
5807 | * happen once though. 'last_events' will soon reflect | |
5808 | * the state where there is little or no outstanding | |
5809 | * resync requests, and further resync activity will | |
5810 | * always make curr_events less than last_events. | |
c0e48521 | 5811 | * |
1da177e4 | 5812 | */ |
eea1bf38 | 5813 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
5814 | rdev->last_events = curr_events; |
5815 | idle = 0; | |
5816 | } | |
5817 | } | |
4b80991c | 5818 | rcu_read_unlock(); |
1da177e4 LT |
5819 | return idle; |
5820 | } | |
5821 | ||
5822 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
5823 | { | |
5824 | /* another "blocks" (512byte) blocks have been synced */ | |
5825 | atomic_sub(blocks, &mddev->recovery_active); | |
5826 | wake_up(&mddev->recovery_wait); | |
5827 | if (!ok) { | |
dfc70645 | 5828 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5829 | md_wakeup_thread(mddev->thread); |
5830 | // stop recovery, signal do_sync .... | |
5831 | } | |
5832 | } | |
5833 | ||
5834 | ||
06d91a5f N |
5835 | /* md_write_start(mddev, bi) |
5836 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
5837 | * in superblock) before writing, schedule a superblock update |
5838 | * and wait for it to complete. | |
06d91a5f | 5839 | */ |
3d310eb7 | 5840 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 5841 | { |
0fd62b86 | 5842 | int did_change = 0; |
06d91a5f | 5843 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 5844 | return; |
06d91a5f | 5845 | |
f91de92e N |
5846 | BUG_ON(mddev->ro == 1); |
5847 | if (mddev->ro == 2) { | |
5848 | /* need to switch to read/write */ | |
5849 | mddev->ro = 0; | |
5850 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5851 | md_wakeup_thread(mddev->thread); | |
25156198 | 5852 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 5853 | did_change = 1; |
f91de92e | 5854 | } |
06d91a5f | 5855 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
5856 | if (mddev->safemode == 1) |
5857 | mddev->safemode = 0; | |
06d91a5f | 5858 | if (mddev->in_sync) { |
a9701a30 | 5859 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
5860 | if (mddev->in_sync) { |
5861 | mddev->in_sync = 0; | |
850b2b42 | 5862 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 5863 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 5864 | did_change = 1; |
3d310eb7 | 5865 | } |
a9701a30 | 5866 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 5867 | } |
0fd62b86 | 5868 | if (did_change) |
b62b7590 | 5869 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
5870 | wait_event(mddev->sb_wait, |
5871 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
5872 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
5873 | } |
5874 | ||
5875 | void md_write_end(mddev_t *mddev) | |
5876 | { | |
5877 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
5878 | if (mddev->safemode == 2) | |
5879 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 5880 | else if (mddev->safemode_delay) |
1da177e4 LT |
5881 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
5882 | } | |
5883 | } | |
5884 | ||
2a2275d6 N |
5885 | /* md_allow_write(mddev) |
5886 | * Calling this ensures that the array is marked 'active' so that writes | |
5887 | * may proceed without blocking. It is important to call this before | |
5888 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
5889 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
5890 | * |
5891 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
5892 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 5893 | */ |
b5470dc5 | 5894 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
5895 | { |
5896 | if (!mddev->pers) | |
b5470dc5 | 5897 | return 0; |
2a2275d6 | 5898 | if (mddev->ro) |
b5470dc5 | 5899 | return 0; |
1a0fd497 | 5900 | if (!mddev->pers->sync_request) |
b5470dc5 | 5901 | return 0; |
2a2275d6 N |
5902 | |
5903 | spin_lock_irq(&mddev->write_lock); | |
5904 | if (mddev->in_sync) { | |
5905 | mddev->in_sync = 0; | |
5906 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
5907 | if (mddev->safemode_delay && | |
5908 | mddev->safemode == 0) | |
5909 | mddev->safemode = 1; | |
5910 | spin_unlock_irq(&mddev->write_lock); | |
5911 | md_update_sb(mddev, 0); | |
b62b7590 | 5912 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
5913 | } else |
5914 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
5915 | |
5916 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
5917 | return -EAGAIN; | |
5918 | else | |
5919 | return 0; | |
2a2275d6 N |
5920 | } |
5921 | EXPORT_SYMBOL_GPL(md_allow_write); | |
5922 | ||
1da177e4 LT |
5923 | #define SYNC_MARKS 10 |
5924 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 5925 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
5926 | { |
5927 | mddev_t *mddev2; | |
5928 | unsigned int currspeed = 0, | |
5929 | window; | |
57afd89f | 5930 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
5931 | unsigned long mark[SYNC_MARKS]; |
5932 | sector_t mark_cnt[SYNC_MARKS]; | |
5933 | int last_mark,m; | |
5934 | struct list_head *tmp; | |
5935 | sector_t last_check; | |
57afd89f | 5936 | int skipped = 0; |
5fd6c1dc | 5937 | mdk_rdev_t *rdev; |
61df9d91 | 5938 | char *desc; |
1da177e4 LT |
5939 | |
5940 | /* just incase thread restarts... */ | |
5941 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
5942 | return; | |
5fd6c1dc N |
5943 | if (mddev->ro) /* never try to sync a read-only array */ |
5944 | return; | |
1da177e4 | 5945 | |
61df9d91 N |
5946 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
5947 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
5948 | desc = "data-check"; | |
5949 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
5950 | desc = "requested-resync"; | |
5951 | else | |
5952 | desc = "resync"; | |
5953 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
5954 | desc = "reshape"; | |
5955 | else | |
5956 | desc = "recovery"; | |
5957 | ||
1da177e4 LT |
5958 | /* we overload curr_resync somewhat here. |
5959 | * 0 == not engaged in resync at all | |
5960 | * 2 == checking that there is no conflict with another sync | |
5961 | * 1 == like 2, but have yielded to allow conflicting resync to | |
5962 | * commense | |
5963 | * other == active in resync - this many blocks | |
5964 | * | |
5965 | * Before starting a resync we must have set curr_resync to | |
5966 | * 2, and then checked that every "conflicting" array has curr_resync | |
5967 | * less than ours. When we find one that is the same or higher | |
5968 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
5969 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
5970 | * This will mean we have to start checking from the beginning again. | |
5971 | * | |
5972 | */ | |
5973 | ||
5974 | do { | |
5975 | mddev->curr_resync = 2; | |
5976 | ||
5977 | try_again: | |
787453c2 | 5978 | if (kthread_should_stop()) { |
6985c43f | 5979 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
5980 | goto skip; |
5981 | } | |
29ac4aa3 | 5982 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
5983 | if (mddev2 == mddev) |
5984 | continue; | |
90b08710 BS |
5985 | if (!mddev->parallel_resync |
5986 | && mddev2->curr_resync | |
5987 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
5988 | DEFINE_WAIT(wq); |
5989 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
5990 | /* arbitrarily yield */ | |
5991 | mddev->curr_resync = 1; | |
5992 | wake_up(&resync_wait); | |
5993 | } | |
5994 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
5995 | /* no need to wait here, we can wait the next | |
5996 | * time 'round when curr_resync == 2 | |
5997 | */ | |
5998 | continue; | |
9744197c N |
5999 | /* We need to wait 'interruptible' so as not to |
6000 | * contribute to the load average, and not to | |
6001 | * be caught by 'softlockup' | |
6002 | */ | |
6003 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6004 | if (!kthread_should_stop() && |
8712e553 | 6005 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6006 | printk(KERN_INFO "md: delaying %s of %s" |
6007 | " until %s has finished (they" | |
1da177e4 | 6008 | " share one or more physical units)\n", |
61df9d91 | 6009 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6010 | mddev_put(mddev2); |
9744197c N |
6011 | if (signal_pending(current)) |
6012 | flush_signals(current); | |
1da177e4 LT |
6013 | schedule(); |
6014 | finish_wait(&resync_wait, &wq); | |
6015 | goto try_again; | |
6016 | } | |
6017 | finish_wait(&resync_wait, &wq); | |
6018 | } | |
6019 | } | |
6020 | } while (mddev->curr_resync < 2); | |
6021 | ||
5fd6c1dc | 6022 | j = 0; |
9d88883e | 6023 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6024 | /* resync follows the size requested by the personality, |
57afd89f | 6025 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6026 | */ |
6027 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6028 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6029 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6030 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6031 | j = mddev->resync_min; | |
6032 | else if (!mddev->bitmap) | |
5fd6c1dc | 6033 | j = mddev->recovery_cp; |
5e96ee65 | 6034 | |
ccfcc3c1 | 6035 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6036 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6037 | else { |
1da177e4 | 6038 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6039 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6040 | j = MaxSector; |
159ec1fc | 6041 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6042 | if (rdev->raid_disk >= 0 && |
6043 | !test_bit(Faulty, &rdev->flags) && | |
6044 | !test_bit(In_sync, &rdev->flags) && | |
6045 | rdev->recovery_offset < j) | |
6046 | j = rdev->recovery_offset; | |
6047 | } | |
1da177e4 | 6048 | |
61df9d91 N |
6049 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6050 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6051 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6052 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6053 | "(but not more than %d KB/sec) for %s.\n", |
6054 | speed_max(mddev), desc); | |
1da177e4 | 6055 | |
eea1bf38 | 6056 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6057 | |
57afd89f | 6058 | io_sectors = 0; |
1da177e4 LT |
6059 | for (m = 0; m < SYNC_MARKS; m++) { |
6060 | mark[m] = jiffies; | |
57afd89f | 6061 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6062 | } |
6063 | last_mark = 0; | |
6064 | mddev->resync_mark = mark[last_mark]; | |
6065 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6066 | ||
6067 | /* | |
6068 | * Tune reconstruction: | |
6069 | */ | |
6070 | window = 32*(PAGE_SIZE/512); | |
6071 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6072 | window/2,(unsigned long long) max_sectors/2); | |
6073 | ||
6074 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6075 | last_check = 0; |
6076 | ||
6077 | if (j>2) { | |
6078 | printk(KERN_INFO | |
61df9d91 N |
6079 | "md: resuming %s of %s from checkpoint.\n", |
6080 | desc, mdname(mddev)); | |
1da177e4 LT |
6081 | mddev->curr_resync = j; |
6082 | } | |
6083 | ||
6084 | while (j < max_sectors) { | |
57afd89f | 6085 | sector_t sectors; |
1da177e4 | 6086 | |
57afd89f | 6087 | skipped = 0; |
c6207277 N |
6088 | if (j >= mddev->resync_max) { |
6089 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
6090 | wait_event(mddev->recovery_wait, | |
6091 | mddev->resync_max > j | |
6092 | || kthread_should_stop()); | |
6093 | } | |
6094 | if (kthread_should_stop()) | |
6095 | goto interrupted; | |
97e4f42d N |
6096 | |
6097 | if (mddev->curr_resync > mddev->curr_resync_completed && | |
6098 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6099 | > (max_sectors >> 4)) { | |
6100 | /* time to update curr_resync_completed */ | |
6101 | blk_unplug(mddev->queue); | |
6102 | wait_event(mddev->recovery_wait, | |
6103 | atomic_read(&mddev->recovery_active) == 0); | |
6104 | mddev->curr_resync_completed = | |
6105 | mddev->curr_resync; | |
6106 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6107 | } | |
57afd89f | 6108 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6109 | currspeed < speed_min(mddev)); |
57afd89f | 6110 | if (sectors == 0) { |
dfc70645 | 6111 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6112 | goto out; |
6113 | } | |
57afd89f N |
6114 | |
6115 | if (!skipped) { /* actual IO requested */ | |
6116 | io_sectors += sectors; | |
6117 | atomic_add(sectors, &mddev->recovery_active); | |
6118 | } | |
6119 | ||
1da177e4 LT |
6120 | j += sectors; |
6121 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6122 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6123 | if (last_check == 0) |
6124 | /* this is the earliers that rebuilt will be | |
6125 | * visible in /proc/mdstat | |
6126 | */ | |
6127 | md_new_event(mddev); | |
57afd89f N |
6128 | |
6129 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6130 | continue; |
6131 | ||
57afd89f | 6132 | last_check = io_sectors; |
1da177e4 | 6133 | |
dfc70645 | 6134 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6135 | break; |
6136 | ||
6137 | repeat: | |
6138 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6139 | /* step marks */ | |
6140 | int next = (last_mark+1) % SYNC_MARKS; | |
6141 | ||
6142 | mddev->resync_mark = mark[next]; | |
6143 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6144 | mark[next] = jiffies; | |
57afd89f | 6145 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6146 | last_mark = next; |
6147 | } | |
6148 | ||
6149 | ||
c6207277 N |
6150 | if (kthread_should_stop()) |
6151 | goto interrupted; | |
6152 | ||
1da177e4 LT |
6153 | |
6154 | /* | |
6155 | * this loop exits only if either when we are slower than | |
6156 | * the 'hard' speed limit, or the system was IO-idle for | |
6157 | * a jiffy. | |
6158 | * the system might be non-idle CPU-wise, but we only care | |
6159 | * about not overloading the IO subsystem. (things like an | |
6160 | * e2fsck being done on the RAID array should execute fast) | |
6161 | */ | |
2ad8b1ef | 6162 | blk_unplug(mddev->queue); |
1da177e4 LT |
6163 | cond_resched(); |
6164 | ||
57afd89f N |
6165 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6166 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6167 | |
88202a0c N |
6168 | if (currspeed > speed_min(mddev)) { |
6169 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6170 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6171 | msleep(500); |
1da177e4 LT |
6172 | goto repeat; |
6173 | } | |
6174 | } | |
6175 | } | |
61df9d91 | 6176 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6177 | /* |
6178 | * this also signals 'finished resyncing' to md_stop | |
6179 | */ | |
6180 | out: | |
2ad8b1ef | 6181 | blk_unplug(mddev->queue); |
1da177e4 LT |
6182 | |
6183 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6184 | ||
6185 | /* tell personality that we are finished */ | |
57afd89f | 6186 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6187 | |
dfc70645 | 6188 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6189 | mddev->curr_resync > 2) { |
6190 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6191 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6192 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6193 | printk(KERN_INFO | |
61df9d91 N |
6194 | "md: checkpointing %s of %s.\n", |
6195 | desc, mdname(mddev)); | |
5fd6c1dc N |
6196 | mddev->recovery_cp = mddev->curr_resync; |
6197 | } | |
6198 | } else | |
6199 | mddev->recovery_cp = MaxSector; | |
6200 | } else { | |
6201 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6202 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6203 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6204 | if (rdev->raid_disk >= 0 && |
6205 | !test_bit(Faulty, &rdev->flags) && | |
6206 | !test_bit(In_sync, &rdev->flags) && | |
6207 | rdev->recovery_offset < mddev->curr_resync) | |
6208 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6209 | } |
1da177e4 | 6210 | } |
17571284 | 6211 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6212 | |
1da177e4 LT |
6213 | skip: |
6214 | mddev->curr_resync = 0; | |
5e96ee65 | 6215 | mddev->resync_min = 0; |
c6207277 N |
6216 | mddev->resync_max = MaxSector; |
6217 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
6218 | wake_up(&resync_wait); |
6219 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6220 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6221 | return; |
6222 | ||
6223 | interrupted: | |
6224 | /* | |
6225 | * got a signal, exit. | |
6226 | */ | |
6227 | printk(KERN_INFO | |
6228 | "md: md_do_sync() got signal ... exiting\n"); | |
6229 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6230 | goto out; | |
6231 | ||
1da177e4 | 6232 | } |
29269553 | 6233 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6234 | |
6235 | ||
b4c4c7b8 N |
6236 | static int remove_and_add_spares(mddev_t *mddev) |
6237 | { | |
6238 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6239 | int spares = 0; |
6240 | ||
97e4f42d N |
6241 | mddev->curr_resync_completed = 0; |
6242 | ||
159ec1fc | 6243 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6244 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6245 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6246 | (test_bit(Faulty, &rdev->flags) || |
6247 | ! test_bit(In_sync, &rdev->flags)) && | |
6248 | atomic_read(&rdev->nr_pending)==0) { | |
6249 | if (mddev->pers->hot_remove_disk( | |
6250 | mddev, rdev->raid_disk)==0) { | |
6251 | char nm[20]; | |
6252 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6253 | sysfs_remove_link(&mddev->kobj, nm); | |
6254 | rdev->raid_disk = -1; | |
6255 | } | |
6256 | } | |
6257 | ||
4044ba58 | 6258 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6259 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6260 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6261 | !test_bit(In_sync, &rdev->flags) && |
6262 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6263 | spares++; |
b4c4c7b8 N |
6264 | if (rdev->raid_disk < 0 |
6265 | && !test_bit(Faulty, &rdev->flags)) { | |
6266 | rdev->recovery_offset = 0; | |
199050ea NB |
6267 | if (mddev->pers-> |
6268 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6269 | char nm[20]; |
6270 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6271 | if (sysfs_create_link(&mddev->kobj, |
6272 | &rdev->kobj, nm)) | |
6273 | printk(KERN_WARNING | |
6274 | "md: cannot register " | |
6275 | "%s for %s\n", | |
6276 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6277 | spares++; |
6278 | md_new_event(mddev); | |
6279 | } else | |
6280 | break; | |
6281 | } | |
dfc70645 | 6282 | } |
b4c4c7b8 N |
6283 | } |
6284 | return spares; | |
6285 | } | |
1da177e4 LT |
6286 | /* |
6287 | * This routine is regularly called by all per-raid-array threads to | |
6288 | * deal with generic issues like resync and super-block update. | |
6289 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6290 | * need this as they never do any recovery or update the superblock. | |
6291 | * | |
6292 | * It does not do any resync itself, but rather "forks" off other threads | |
6293 | * to do that as needed. | |
6294 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6295 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6296 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6297 | * and wakeups up this thread which will reap the thread and finish up. |
6298 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6299 | * | |
6300 | * The overall approach is: | |
6301 | * 1/ if the superblock needs updating, update it. | |
6302 | * 2/ If a recovery thread is running, don't do anything else. | |
6303 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6304 | * 4/ If there are any faulty devices, remove them. | |
6305 | * 5/ If array is degraded, try to add spares devices | |
6306 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6307 | */ | |
6308 | void md_check_recovery(mddev_t *mddev) | |
6309 | { | |
6310 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6311 | |
6312 | ||
5f40402d N |
6313 | if (mddev->bitmap) |
6314 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
6315 | |
6316 | if (mddev->ro) | |
6317 | return; | |
fca4d848 N |
6318 | |
6319 | if (signal_pending(current)) { | |
31a59e34 | 6320 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6321 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6322 | mdname(mddev)); | |
6323 | mddev->safemode = 2; | |
6324 | } | |
6325 | flush_signals(current); | |
6326 | } | |
6327 | ||
c89a8eee N |
6328 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6329 | return; | |
1da177e4 | 6330 | if ( ! ( |
e691063a | 6331 | (mddev->flags && !mddev->external) || |
1da177e4 | 6332 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6333 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6334 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6335 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6336 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6337 | )) |
6338 | return; | |
fca4d848 | 6339 | |
df5b89b3 | 6340 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6341 | int spares = 0; |
fca4d848 | 6342 | |
c89a8eee N |
6343 | if (mddev->ro) { |
6344 | /* Only thing we do on a ro array is remove | |
6345 | * failed devices. | |
6346 | */ | |
6347 | remove_and_add_spares(mddev); | |
6348 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6349 | goto unlock; | |
6350 | } | |
6351 | ||
31a59e34 | 6352 | if (!mddev->external) { |
0fd62b86 | 6353 | int did_change = 0; |
31a59e34 N |
6354 | spin_lock_irq(&mddev->write_lock); |
6355 | if (mddev->safemode && | |
6356 | !atomic_read(&mddev->writes_pending) && | |
6357 | !mddev->in_sync && | |
6358 | mddev->recovery_cp == MaxSector) { | |
6359 | mddev->in_sync = 1; | |
0fd62b86 | 6360 | did_change = 1; |
31a59e34 N |
6361 | if (mddev->persistent) |
6362 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6363 | } | |
6364 | if (mddev->safemode == 1) | |
6365 | mddev->safemode = 0; | |
6366 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6367 | if (did_change) |
b62b7590 | 6368 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6369 | } |
fca4d848 | 6370 | |
850b2b42 N |
6371 | if (mddev->flags) |
6372 | md_update_sb(mddev, 0); | |
06d91a5f | 6373 | |
159ec1fc | 6374 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6375 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6376 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6377 | |
06d91a5f | 6378 | |
1da177e4 LT |
6379 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6380 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6381 | /* resync/recovery still happening */ | |
6382 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6383 | goto unlock; | |
6384 | } | |
6385 | if (mddev->sync_thread) { | |
6386 | /* resync has finished, collect result */ | |
6387 | md_unregister_thread(mddev->sync_thread); | |
6388 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6389 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6390 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6391 | /* success...*/ |
6392 | /* activate any spares */ | |
a99ac971 NB |
6393 | if (mddev->pers->spare_active(mddev)) |
6394 | sysfs_notify(&mddev->kobj, NULL, | |
6395 | "degraded"); | |
1da177e4 | 6396 | } |
850b2b42 | 6397 | md_update_sb(mddev, 1); |
41158c7e N |
6398 | |
6399 | /* if array is no-longer degraded, then any saved_raid_disk | |
6400 | * information must be scrapped | |
6401 | */ | |
6402 | if (!mddev->degraded) | |
159ec1fc | 6403 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6404 | rdev->saved_raid_disk = -1; |
6405 | ||
1da177e4 LT |
6406 | mddev->recovery = 0; |
6407 | /* flag recovery needed just to double check */ | |
6408 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6409 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6410 | md_new_event(mddev); |
1da177e4 LT |
6411 | goto unlock; |
6412 | } | |
72a23c21 NB |
6413 | /* Set RUNNING before clearing NEEDED to avoid |
6414 | * any transients in the value of "sync_action". | |
6415 | */ | |
6416 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6417 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6418 | /* Clear some bits that don't mean anything, but |
6419 | * might be left set | |
6420 | */ | |
24dd469d N |
6421 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6422 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6423 | |
5fd6c1dc N |
6424 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6425 | goto unlock; | |
1da177e4 LT |
6426 | /* no recovery is running. |
6427 | * remove any failed drives, then | |
6428 | * add spares if possible. | |
6429 | * Spare are also removed and re-added, to allow | |
6430 | * the personality to fail the re-add. | |
6431 | */ | |
1da177e4 | 6432 | |
b4c4c7b8 N |
6433 | if (mddev->reshape_position != MaxSector) { |
6434 | if (mddev->pers->check_reshape(mddev) != 0) | |
6435 | /* Cannot proceed */ | |
6436 | goto unlock; | |
6437 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6438 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6439 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6440 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6441 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6442 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6443 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6444 | } else if (mddev->recovery_cp < MaxSector) { |
6445 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6446 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6447 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6448 | /* nothing to be done ... */ | |
1da177e4 | 6449 | goto unlock; |
24dd469d | 6450 | |
1da177e4 | 6451 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6452 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6453 | /* We are adding a device or devices to an array | |
6454 | * which has the bitmap stored on all devices. | |
6455 | * So make sure all bitmap pages get written | |
6456 | */ | |
6457 | bitmap_write_all(mddev->bitmap); | |
6458 | } | |
1da177e4 LT |
6459 | mddev->sync_thread = md_register_thread(md_do_sync, |
6460 | mddev, | |
6461 | "%s_resync"); | |
6462 | if (!mddev->sync_thread) { | |
6463 | printk(KERN_ERR "%s: could not start resync" | |
6464 | " thread...\n", | |
6465 | mdname(mddev)); | |
6466 | /* leave the spares where they are, it shouldn't hurt */ | |
6467 | mddev->recovery = 0; | |
d7603b7e | 6468 | } else |
1da177e4 | 6469 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6470 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6471 | md_new_event(mddev); |
1da177e4 LT |
6472 | } |
6473 | unlock: | |
72a23c21 NB |
6474 | if (!mddev->sync_thread) { |
6475 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6476 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6477 | &mddev->recovery)) | |
0c3573f1 N |
6478 | if (mddev->sysfs_action) |
6479 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6480 | } |
1da177e4 LT |
6481 | mddev_unlock(mddev); |
6482 | } | |
6483 | } | |
6484 | ||
6bfe0b49 DW |
6485 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6486 | { | |
3c0ee63a | 6487 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
6488 | wait_event_timeout(rdev->blocked_wait, |
6489 | !test_bit(Blocked, &rdev->flags), | |
6490 | msecs_to_jiffies(5000)); | |
6491 | rdev_dec_pending(rdev, mddev); | |
6492 | } | |
6493 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6494 | ||
75c96f85 AB |
6495 | static int md_notify_reboot(struct notifier_block *this, |
6496 | unsigned long code, void *x) | |
1da177e4 LT |
6497 | { |
6498 | struct list_head *tmp; | |
6499 | mddev_t *mddev; | |
6500 | ||
6501 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6502 | ||
6503 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6504 | ||
29ac4aa3 | 6505 | for_each_mddev(mddev, tmp) |
c71d4887 | 6506 | if (mddev_trylock(mddev)) { |
2b25000b N |
6507 | /* Force a switch to readonly even array |
6508 | * appears to still be in use. Hence | |
6509 | * the '100'. | |
6510 | */ | |
d710e138 | 6511 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
6512 | mddev_unlock(mddev); |
6513 | } | |
1da177e4 LT |
6514 | /* |
6515 | * certain more exotic SCSI devices are known to be | |
6516 | * volatile wrt too early system reboots. While the | |
6517 | * right place to handle this issue is the given | |
6518 | * driver, we do want to have a safe RAID driver ... | |
6519 | */ | |
6520 | mdelay(1000*1); | |
6521 | } | |
6522 | return NOTIFY_DONE; | |
6523 | } | |
6524 | ||
75c96f85 | 6525 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6526 | .notifier_call = md_notify_reboot, |
6527 | .next = NULL, | |
6528 | .priority = INT_MAX, /* before any real devices */ | |
6529 | }; | |
6530 | ||
6531 | static void md_geninit(void) | |
6532 | { | |
1da177e4 LT |
6533 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6534 | ||
c7705f34 | 6535 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6536 | } |
6537 | ||
75c96f85 | 6538 | static int __init md_init(void) |
1da177e4 | 6539 | { |
3dbd8c2e | 6540 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
6541 | return -1; |
6542 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 6543 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
6544 | return -1; |
6545 | } | |
3dbd8c2e | 6546 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
6547 | md_probe, NULL, NULL); |
6548 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6549 | md_probe, NULL, NULL); |
6550 | ||
1da177e4 | 6551 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6552 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6553 | |
6554 | md_geninit(); | |
d710e138 | 6555 | return 0; |
1da177e4 LT |
6556 | } |
6557 | ||
6558 | ||
6559 | #ifndef MODULE | |
6560 | ||
6561 | /* | |
6562 | * Searches all registered partitions for autorun RAID arrays | |
6563 | * at boot time. | |
6564 | */ | |
4d936ec1 ME |
6565 | |
6566 | static LIST_HEAD(all_detected_devices); | |
6567 | struct detected_devices_node { | |
6568 | struct list_head list; | |
6569 | dev_t dev; | |
6570 | }; | |
1da177e4 LT |
6571 | |
6572 | void md_autodetect_dev(dev_t dev) | |
6573 | { | |
4d936ec1 ME |
6574 | struct detected_devices_node *node_detected_dev; |
6575 | ||
6576 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6577 | if (node_detected_dev) { | |
6578 | node_detected_dev->dev = dev; | |
6579 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6580 | } else { | |
6581 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6582 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6583 | } | |
1da177e4 LT |
6584 | } |
6585 | ||
6586 | ||
6587 | static void autostart_arrays(int part) | |
6588 | { | |
6589 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6590 | struct detected_devices_node *node_detected_dev; |
6591 | dev_t dev; | |
6592 | int i_scanned, i_passed; | |
1da177e4 | 6593 | |
4d936ec1 ME |
6594 | i_scanned = 0; |
6595 | i_passed = 0; | |
1da177e4 | 6596 | |
4d936ec1 | 6597 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6598 | |
4d936ec1 ME |
6599 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6600 | i_scanned++; | |
6601 | node_detected_dev = list_entry(all_detected_devices.next, | |
6602 | struct detected_devices_node, list); | |
6603 | list_del(&node_detected_dev->list); | |
6604 | dev = node_detected_dev->dev; | |
6605 | kfree(node_detected_dev); | |
df968c4e | 6606 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6607 | if (IS_ERR(rdev)) |
6608 | continue; | |
6609 | ||
b2d444d7 | 6610 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6611 | MD_BUG(); |
6612 | continue; | |
6613 | } | |
d0fae18f | 6614 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6615 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6616 | i_passed++; |
1da177e4 | 6617 | } |
4d936ec1 ME |
6618 | |
6619 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6620 | i_scanned, i_passed); | |
1da177e4 LT |
6621 | |
6622 | autorun_devices(part); | |
6623 | } | |
6624 | ||
fdee8ae4 | 6625 | #endif /* !MODULE */ |
1da177e4 LT |
6626 | |
6627 | static __exit void md_exit(void) | |
6628 | { | |
6629 | mddev_t *mddev; | |
6630 | struct list_head *tmp; | |
8ab5e4c1 | 6631 | |
3dbd8c2e | 6632 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 6633 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 6634 | |
3dbd8c2e | 6635 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
6636 | unregister_blkdev(mdp_major, "mdp"); |
6637 | unregister_reboot_notifier(&md_notifier); | |
6638 | unregister_sysctl_table(raid_table_header); | |
6639 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6640 | for_each_mddev(mddev, tmp) { |
1da177e4 | 6641 | export_array(mddev); |
d3374825 | 6642 | mddev->hold_active = 0; |
1da177e4 LT |
6643 | } |
6644 | } | |
6645 | ||
685784aa | 6646 | subsys_initcall(md_init); |
1da177e4 LT |
6647 | module_exit(md_exit) |
6648 | ||
f91de92e N |
6649 | static int get_ro(char *buffer, struct kernel_param *kp) |
6650 | { | |
6651 | return sprintf(buffer, "%d", start_readonly); | |
6652 | } | |
6653 | static int set_ro(const char *val, struct kernel_param *kp) | |
6654 | { | |
6655 | char *e; | |
6656 | int num = simple_strtoul(val, &e, 10); | |
6657 | if (*val && (*e == '\0' || *e == '\n')) { | |
6658 | start_readonly = num; | |
4dbcdc75 | 6659 | return 0; |
f91de92e N |
6660 | } |
6661 | return -EINVAL; | |
6662 | } | |
6663 | ||
80ca3a44 N |
6664 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6665 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6666 | |
efeb53c0 | 6667 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 6668 | |
1da177e4 LT |
6669 | EXPORT_SYMBOL(register_md_personality); |
6670 | EXPORT_SYMBOL(unregister_md_personality); | |
6671 | EXPORT_SYMBOL(md_error); | |
6672 | EXPORT_SYMBOL(md_done_sync); | |
6673 | EXPORT_SYMBOL(md_write_start); | |
6674 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6675 | EXPORT_SYMBOL(md_register_thread); |
6676 | EXPORT_SYMBOL(md_unregister_thread); | |
6677 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6678 | EXPORT_SYMBOL(md_check_recovery); |
6679 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6680 | MODULE_ALIAS("md"); |
72008652 | 6681 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |