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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
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" |
1da177e4 LT |
52 | |
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 | ||
409c57f3 N |
204 | /* Rather than calling directly into the personality make_request function, |
205 | * IO requests come here first so that we can check if the device is | |
206 | * being suspended pending a reconfiguration. | |
207 | * We hold a refcount over the call to ->make_request. By the time that | |
208 | * call has finished, the bio has been linked into some internal structure | |
209 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
210 | */ | |
211 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 212 | { |
409c57f3 N |
213 | mddev_t *mddev = q->queuedata; |
214 | int rv; | |
215 | if (mddev == NULL || mddev->pers == NULL) { | |
216 | bio_io_error(bio); | |
217 | return 0; | |
218 | } | |
219 | rcu_read_lock(); | |
220 | if (mddev->suspended) { | |
221 | DEFINE_WAIT(__wait); | |
222 | for (;;) { | |
223 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
224 | TASK_UNINTERRUPTIBLE); | |
225 | if (!mddev->suspended) | |
226 | break; | |
227 | rcu_read_unlock(); | |
228 | schedule(); | |
229 | rcu_read_lock(); | |
230 | } | |
231 | finish_wait(&mddev->sb_wait, &__wait); | |
232 | } | |
233 | atomic_inc(&mddev->active_io); | |
234 | rcu_read_unlock(); | |
235 | rv = mddev->pers->make_request(q, bio); | |
236 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) | |
237 | wake_up(&mddev->sb_wait); | |
238 | ||
239 | return rv; | |
240 | } | |
241 | ||
242 | static void mddev_suspend(mddev_t *mddev) | |
243 | { | |
244 | BUG_ON(mddev->suspended); | |
245 | mddev->suspended = 1; | |
246 | synchronize_rcu(); | |
247 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
248 | mddev->pers->quiesce(mddev, 1); | |
249 | md_unregister_thread(mddev->thread); | |
250 | mddev->thread = NULL; | |
251 | /* we now know that no code is executing in the personality module, | |
252 | * except possibly the tail end of a ->bi_end_io function, but that | |
253 | * is certain to complete before the module has a chance to get | |
254 | * unloaded | |
255 | */ | |
256 | } | |
257 | ||
258 | static void mddev_resume(mddev_t *mddev) | |
259 | { | |
260 | mddev->suspended = 0; | |
261 | wake_up(&mddev->sb_wait); | |
262 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 LT |
263 | } |
264 | ||
409c57f3 | 265 | |
1da177e4 LT |
266 | static inline mddev_t *mddev_get(mddev_t *mddev) |
267 | { | |
268 | atomic_inc(&mddev->active); | |
269 | return mddev; | |
270 | } | |
271 | ||
5fd3a17e | 272 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 273 | |
1da177e4 LT |
274 | static void mddev_put(mddev_t *mddev) |
275 | { | |
276 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
277 | return; | |
d3374825 N |
278 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
279 | !mddev->hold_active) { | |
1da177e4 | 280 | list_del(&mddev->all_mddevs); |
d3374825 N |
281 | if (mddev->gendisk) { |
282 | /* we did a probe so need to clean up. | |
283 | * Call schedule_work inside the spinlock | |
284 | * so that flush_scheduled_work() after | |
285 | * mddev_find will succeed in waiting for the | |
286 | * work to be done. | |
287 | */ | |
288 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
289 | schedule_work(&mddev->del_work); | |
290 | } else | |
291 | kfree(mddev); | |
292 | } | |
293 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
294 | } |
295 | ||
296 | static mddev_t * mddev_find(dev_t unit) | |
297 | { | |
298 | mddev_t *mddev, *new = NULL; | |
299 | ||
300 | retry: | |
301 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
302 | |
303 | if (unit) { | |
304 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
305 | if (mddev->unit == unit) { | |
306 | mddev_get(mddev); | |
307 | spin_unlock(&all_mddevs_lock); | |
308 | kfree(new); | |
309 | return mddev; | |
310 | } | |
311 | ||
312 | if (new) { | |
313 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 314 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
315 | new->hold_active = UNTIL_IOCTL; |
316 | return new; | |
1da177e4 | 317 | } |
efeb53c0 N |
318 | } else if (new) { |
319 | /* find an unused unit number */ | |
320 | static int next_minor = 512; | |
321 | int start = next_minor; | |
322 | int is_free = 0; | |
323 | int dev = 0; | |
324 | while (!is_free) { | |
325 | dev = MKDEV(MD_MAJOR, next_minor); | |
326 | next_minor++; | |
327 | if (next_minor > MINORMASK) | |
328 | next_minor = 0; | |
329 | if (next_minor == start) { | |
330 | /* Oh dear, all in use. */ | |
331 | spin_unlock(&all_mddevs_lock); | |
332 | kfree(new); | |
333 | return NULL; | |
334 | } | |
335 | ||
336 | is_free = 1; | |
337 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
338 | if (mddev->unit == dev) { | |
339 | is_free = 0; | |
340 | break; | |
341 | } | |
342 | } | |
343 | new->unit = dev; | |
344 | new->md_minor = MINOR(dev); | |
345 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
346 | list_add(&new->all_mddevs, &all_mddevs); |
347 | spin_unlock(&all_mddevs_lock); | |
348 | return new; | |
349 | } | |
350 | spin_unlock(&all_mddevs_lock); | |
351 | ||
9ffae0cf | 352 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
353 | if (!new) |
354 | return NULL; | |
355 | ||
1da177e4 LT |
356 | new->unit = unit; |
357 | if (MAJOR(unit) == MD_MAJOR) | |
358 | new->md_minor = MINOR(unit); | |
359 | else | |
360 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
361 | ||
df5b89b3 | 362 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
363 | INIT_LIST_HEAD(&new->disks); |
364 | INIT_LIST_HEAD(&new->all_mddevs); | |
365 | init_timer(&new->safemode_timer); | |
366 | atomic_set(&new->active, 1); | |
f2ea68cf | 367 | atomic_set(&new->openers, 0); |
409c57f3 | 368 | atomic_set(&new->active_io, 0); |
06d91a5f | 369 | spin_lock_init(&new->write_lock); |
3d310eb7 | 370 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 371 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 372 | new->reshape_position = MaxSector; |
5e96ee65 | 373 | new->resync_min = 0; |
c6207277 | 374 | new->resync_max = MaxSector; |
d897dbf9 | 375 | new->level = LEVEL_NONE; |
1da177e4 | 376 | |
1da177e4 LT |
377 | goto retry; |
378 | } | |
379 | ||
380 | static inline int mddev_lock(mddev_t * mddev) | |
381 | { | |
df5b89b3 | 382 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
383 | } |
384 | ||
b522adcd DW |
385 | static inline int mddev_is_locked(mddev_t *mddev) |
386 | { | |
387 | return mutex_is_locked(&mddev->reconfig_mutex); | |
388 | } | |
389 | ||
1da177e4 LT |
390 | static inline int mddev_trylock(mddev_t * mddev) |
391 | { | |
df5b89b3 | 392 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
393 | } |
394 | ||
395 | static inline void mddev_unlock(mddev_t * mddev) | |
396 | { | |
df5b89b3 | 397 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 398 | |
005eca5e | 399 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
400 | } |
401 | ||
2989ddbd | 402 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 403 | { |
159ec1fc | 404 | mdk_rdev_t *rdev; |
1da177e4 | 405 | |
159ec1fc | 406 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
407 | if (rdev->desc_nr == nr) |
408 | return rdev; | |
159ec1fc | 409 | |
1da177e4 LT |
410 | return NULL; |
411 | } | |
412 | ||
413 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
414 | { | |
1da177e4 LT |
415 | mdk_rdev_t *rdev; |
416 | ||
159ec1fc | 417 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
418 | if (rdev->bdev->bd_dev == dev) |
419 | return rdev; | |
159ec1fc | 420 | |
1da177e4 LT |
421 | return NULL; |
422 | } | |
423 | ||
d9d166c2 | 424 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
425 | { |
426 | struct mdk_personality *pers; | |
d9d166c2 N |
427 | list_for_each_entry(pers, &pers_list, list) { |
428 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 429 | return pers; |
d9d166c2 N |
430 | if (strcmp(pers->name, clevel)==0) |
431 | return pers; | |
432 | } | |
2604b703 N |
433 | return NULL; |
434 | } | |
435 | ||
b73df2d3 | 436 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 437 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 438 | { |
b73df2d3 AN |
439 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
440 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
441 | } |
442 | ||
e7debaa4 | 443 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 444 | { |
0f420358 | 445 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
446 | |
447 | if (chunk_size) | |
e7debaa4 AN |
448 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
449 | return num_sectors; | |
1da177e4 LT |
450 | } |
451 | ||
452 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
453 | { | |
454 | if (rdev->sb_page) | |
455 | MD_BUG(); | |
456 | ||
457 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
458 | if (!rdev->sb_page) { | |
459 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 460 | return -ENOMEM; |
1da177e4 LT |
461 | } |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | static void free_disk_sb(mdk_rdev_t * rdev) | |
467 | { | |
468 | if (rdev->sb_page) { | |
2d1f3b5d | 469 | put_page(rdev->sb_page); |
1da177e4 LT |
470 | rdev->sb_loaded = 0; |
471 | rdev->sb_page = NULL; | |
0f420358 | 472 | rdev->sb_start = 0; |
dd8ac336 | 473 | rdev->sectors = 0; |
1da177e4 LT |
474 | } |
475 | } | |
476 | ||
477 | ||
6712ecf8 | 478 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
479 | { |
480 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 481 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 482 | |
3a0f5bbb N |
483 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
484 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
485 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
486 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 487 | md_error(mddev, rdev); |
3a0f5bbb | 488 | } |
7bfa19f2 | 489 | |
a9701a30 N |
490 | if (atomic_dec_and_test(&mddev->pending_writes)) |
491 | wake_up(&mddev->sb_wait); | |
f8b58edf | 492 | bio_put(bio); |
7bfa19f2 N |
493 | } |
494 | ||
6712ecf8 | 495 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
496 | { |
497 | struct bio *bio2 = bio->bi_private; | |
498 | mdk_rdev_t *rdev = bio2->bi_private; | |
499 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
500 | |
501 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
502 | error == -EOPNOTSUPP) { | |
503 | unsigned long flags; | |
504 | /* barriers don't appear to be supported :-( */ | |
505 | set_bit(BarriersNotsupp, &rdev->flags); | |
506 | mddev->barriers_work = 0; | |
507 | spin_lock_irqsave(&mddev->write_lock, flags); | |
508 | bio2->bi_next = mddev->biolist; | |
509 | mddev->biolist = bio2; | |
510 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
511 | wake_up(&mddev->sb_wait); | |
512 | bio_put(bio); | |
6712ecf8 N |
513 | } else { |
514 | bio_put(bio2); | |
515 | bio->bi_private = rdev; | |
516 | super_written(bio, error); | |
a9701a30 | 517 | } |
a9701a30 N |
518 | } |
519 | ||
7bfa19f2 N |
520 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
521 | sector_t sector, int size, struct page *page) | |
522 | { | |
523 | /* write first size bytes of page to sector of rdev | |
524 | * Increment mddev->pending_writes before returning | |
525 | * and decrement it on completion, waking up sb_wait | |
526 | * if zero is reached. | |
527 | * If an error occurred, call md_error | |
a9701a30 N |
528 | * |
529 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
530 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
531 | */ |
532 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
93dbb393 | 533 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); |
7bfa19f2 N |
534 | |
535 | bio->bi_bdev = rdev->bdev; | |
536 | bio->bi_sector = sector; | |
537 | bio_add_page(bio, page, size, 0); | |
538 | bio->bi_private = rdev; | |
539 | bio->bi_end_io = super_written; | |
a9701a30 N |
540 | bio->bi_rw = rw; |
541 | ||
7bfa19f2 | 542 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
543 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
544 | struct bio *rbio; | |
545 | rw |= (1<<BIO_RW_BARRIER); | |
546 | rbio = bio_clone(bio, GFP_NOIO); | |
547 | rbio->bi_private = bio; | |
548 | rbio->bi_end_io = super_written_barrier; | |
549 | submit_bio(rw, rbio); | |
550 | } else | |
551 | submit_bio(rw, bio); | |
552 | } | |
553 | ||
554 | void md_super_wait(mddev_t *mddev) | |
555 | { | |
556 | /* wait for all superblock writes that were scheduled to complete. | |
557 | * if any had to be retried (due to BARRIER problems), retry them | |
558 | */ | |
559 | DEFINE_WAIT(wq); | |
560 | for(;;) { | |
561 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
562 | if (atomic_read(&mddev->pending_writes)==0) | |
563 | break; | |
564 | while (mddev->biolist) { | |
565 | struct bio *bio; | |
566 | spin_lock_irq(&mddev->write_lock); | |
567 | bio = mddev->biolist; | |
568 | mddev->biolist = bio->bi_next ; | |
569 | bio->bi_next = NULL; | |
570 | spin_unlock_irq(&mddev->write_lock); | |
571 | submit_bio(bio->bi_rw, bio); | |
572 | } | |
573 | schedule(); | |
574 | } | |
575 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
576 | } |
577 | ||
6712ecf8 | 578 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 579 | { |
1da177e4 | 580 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
581 | } |
582 | ||
a654b9d8 | 583 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
584 | struct page *page, int rw) |
585 | { | |
baaa2c51 | 586 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
587 | struct completion event; |
588 | int ret; | |
589 | ||
93dbb393 | 590 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
1da177e4 LT |
591 | |
592 | bio->bi_bdev = bdev; | |
593 | bio->bi_sector = sector; | |
594 | bio_add_page(bio, page, size, 0); | |
595 | init_completion(&event); | |
596 | bio->bi_private = &event; | |
597 | bio->bi_end_io = bi_complete; | |
598 | submit_bio(rw, bio); | |
599 | wait_for_completion(&event); | |
600 | ||
601 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
602 | bio_put(bio); | |
603 | return ret; | |
604 | } | |
a8745db2 | 605 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 606 | |
0002b271 | 607 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
608 | { |
609 | char b[BDEVNAME_SIZE]; | |
610 | if (!rdev->sb_page) { | |
611 | MD_BUG(); | |
612 | return -EINVAL; | |
613 | } | |
614 | if (rdev->sb_loaded) | |
615 | return 0; | |
616 | ||
617 | ||
0f420358 | 618 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
619 | goto fail; |
620 | rdev->sb_loaded = 1; | |
621 | return 0; | |
622 | ||
623 | fail: | |
624 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
625 | bdevname(rdev->bdev,b)); | |
626 | return -EINVAL; | |
627 | } | |
628 | ||
629 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
630 | { | |
05710466 AN |
631 | return sb1->set_uuid0 == sb2->set_uuid0 && |
632 | sb1->set_uuid1 == sb2->set_uuid1 && | |
633 | sb1->set_uuid2 == sb2->set_uuid2 && | |
634 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
635 | } |
636 | ||
1da177e4 LT |
637 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
638 | { | |
639 | int ret; | |
640 | mdp_super_t *tmp1, *tmp2; | |
641 | ||
642 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
643 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
644 | ||
645 | if (!tmp1 || !tmp2) { | |
646 | ret = 0; | |
35020f1a | 647 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
648 | goto abort; |
649 | } | |
650 | ||
651 | *tmp1 = *sb1; | |
652 | *tmp2 = *sb2; | |
653 | ||
654 | /* | |
655 | * nr_disks is not constant | |
656 | */ | |
657 | tmp1->nr_disks = 0; | |
658 | tmp2->nr_disks = 0; | |
659 | ||
ce0c8e05 | 660 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 661 | abort: |
990a8baf JJ |
662 | kfree(tmp1); |
663 | kfree(tmp2); | |
1da177e4 LT |
664 | return ret; |
665 | } | |
666 | ||
4d167f09 N |
667 | |
668 | static u32 md_csum_fold(u32 csum) | |
669 | { | |
670 | csum = (csum & 0xffff) + (csum >> 16); | |
671 | return (csum & 0xffff) + (csum >> 16); | |
672 | } | |
673 | ||
1da177e4 LT |
674 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
675 | { | |
4d167f09 N |
676 | u64 newcsum = 0; |
677 | u32 *sb32 = (u32*)sb; | |
678 | int i; | |
1da177e4 LT |
679 | unsigned int disk_csum, csum; |
680 | ||
681 | disk_csum = sb->sb_csum; | |
682 | sb->sb_csum = 0; | |
4d167f09 N |
683 | |
684 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
685 | newcsum += sb32[i]; | |
686 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
687 | ||
688 | ||
689 | #ifdef CONFIG_ALPHA | |
690 | /* This used to use csum_partial, which was wrong for several | |
691 | * reasons including that different results are returned on | |
692 | * different architectures. It isn't critical that we get exactly | |
693 | * the same return value as before (we always csum_fold before | |
694 | * testing, and that removes any differences). However as we | |
695 | * know that csum_partial always returned a 16bit value on | |
696 | * alphas, do a fold to maximise conformity to previous behaviour. | |
697 | */ | |
698 | sb->sb_csum = md_csum_fold(disk_csum); | |
699 | #else | |
1da177e4 | 700 | sb->sb_csum = disk_csum; |
4d167f09 | 701 | #endif |
1da177e4 LT |
702 | return csum; |
703 | } | |
704 | ||
705 | ||
706 | /* | |
707 | * Handle superblock details. | |
708 | * We want to be able to handle multiple superblock formats | |
709 | * so we have a common interface to them all, and an array of | |
710 | * different handlers. | |
711 | * We rely on user-space to write the initial superblock, and support | |
712 | * reading and updating of superblocks. | |
713 | * Interface methods are: | |
714 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
715 | * loads and validates a superblock on dev. | |
716 | * if refdev != NULL, compare superblocks on both devices | |
717 | * Return: | |
718 | * 0 - dev has a superblock that is compatible with refdev | |
719 | * 1 - dev has a superblock that is compatible and newer than refdev | |
720 | * so dev should be used as the refdev in future | |
721 | * -EINVAL superblock incompatible or invalid | |
722 | * -othererror e.g. -EIO | |
723 | * | |
724 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
725 | * Verify that dev is acceptable into mddev. | |
726 | * The first time, mddev->raid_disks will be 0, and data from | |
727 | * dev should be merged in. Subsequent calls check that dev | |
728 | * is new enough. Return 0 or -EINVAL | |
729 | * | |
730 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
731 | * Update the superblock for rdev with data in mddev | |
732 | * This does not write to disc. | |
733 | * | |
734 | */ | |
735 | ||
736 | struct super_type { | |
0cd17fec CW |
737 | char *name; |
738 | struct module *owner; | |
739 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
740 | int minor_version); | |
741 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
742 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
743 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 744 | sector_t num_sectors); |
1da177e4 LT |
745 | }; |
746 | ||
747 | /* | |
748 | * load_super for 0.90.0 | |
749 | */ | |
750 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
751 | { | |
752 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
753 | mdp_super_t *sb; | |
754 | int ret; | |
1da177e4 LT |
755 | |
756 | /* | |
0f420358 | 757 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
758 | * it's at the end of the disk. |
759 | * | |
760 | * It also happens to be a multiple of 4Kb. | |
761 | */ | |
0f420358 | 762 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 763 | |
0002b271 | 764 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
765 | if (ret) return ret; |
766 | ||
767 | ret = -EINVAL; | |
768 | ||
769 | bdevname(rdev->bdev, b); | |
770 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
771 | ||
772 | if (sb->md_magic != MD_SB_MAGIC) { | |
773 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
774 | b); | |
775 | goto abort; | |
776 | } | |
777 | ||
778 | if (sb->major_version != 0 || | |
f6705578 N |
779 | sb->minor_version < 90 || |
780 | sb->minor_version > 91) { | |
1da177e4 LT |
781 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
782 | sb->major_version, sb->minor_version, | |
783 | b); | |
784 | goto abort; | |
785 | } | |
786 | ||
787 | if (sb->raid_disks <= 0) | |
788 | goto abort; | |
789 | ||
4d167f09 | 790 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
791 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
792 | b); | |
793 | goto abort; | |
794 | } | |
795 | ||
796 | rdev->preferred_minor = sb->md_minor; | |
797 | rdev->data_offset = 0; | |
0002b271 | 798 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 799 | |
e11e93fa N |
800 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
801 | if (sb->level != 1 && sb->level != 4 | |
802 | && sb->level != 5 && sb->level != 6 | |
803 | && sb->level != 10) { | |
804 | /* FIXME use a better test */ | |
805 | printk(KERN_WARNING | |
806 | "md: bitmaps not supported for this level.\n"); | |
807 | goto abort; | |
808 | } | |
809 | } | |
810 | ||
1da177e4 LT |
811 | if (sb->level == LEVEL_MULTIPATH) |
812 | rdev->desc_nr = -1; | |
813 | else | |
814 | rdev->desc_nr = sb->this_disk.number; | |
815 | ||
9a7b2b0f | 816 | if (!refdev) { |
1da177e4 | 817 | ret = 1; |
9a7b2b0f | 818 | } else { |
1da177e4 LT |
819 | __u64 ev1, ev2; |
820 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
821 | if (!uuid_equal(refsb, sb)) { | |
822 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
823 | b, bdevname(refdev->bdev,b2)); | |
824 | goto abort; | |
825 | } | |
826 | if (!sb_equal(refsb, sb)) { | |
827 | printk(KERN_WARNING "md: %s has same UUID" | |
828 | " but different superblock to %s\n", | |
829 | b, bdevname(refdev->bdev, b2)); | |
830 | goto abort; | |
831 | } | |
832 | ev1 = md_event(sb); | |
833 | ev2 = md_event(refsb); | |
834 | if (ev1 > ev2) | |
835 | ret = 1; | |
836 | else | |
837 | ret = 0; | |
838 | } | |
dd8ac336 | 839 | rdev->sectors = calc_num_sectors(rdev, sb->chunk_size); |
1da177e4 | 840 | |
dd8ac336 | 841 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
842 | /* "this cannot possibly happen" ... */ |
843 | ret = -EINVAL; | |
844 | ||
1da177e4 LT |
845 | abort: |
846 | return ret; | |
847 | } | |
848 | ||
849 | /* | |
850 | * validate_super for 0.90.0 | |
851 | */ | |
852 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
853 | { | |
854 | mdp_disk_t *desc; | |
855 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 856 | __u64 ev1 = md_event(sb); |
1da177e4 | 857 | |
41158c7e | 858 | rdev->raid_disk = -1; |
c5d79adb N |
859 | clear_bit(Faulty, &rdev->flags); |
860 | clear_bit(In_sync, &rdev->flags); | |
861 | clear_bit(WriteMostly, &rdev->flags); | |
862 | clear_bit(BarriersNotsupp, &rdev->flags); | |
863 | ||
1da177e4 LT |
864 | if (mddev->raid_disks == 0) { |
865 | mddev->major_version = 0; | |
866 | mddev->minor_version = sb->minor_version; | |
867 | mddev->patch_version = sb->patch_version; | |
e691063a | 868 | mddev->external = 0; |
1da177e4 LT |
869 | mddev->chunk_size = sb->chunk_size; |
870 | mddev->ctime = sb->ctime; | |
871 | mddev->utime = sb->utime; | |
872 | mddev->level = sb->level; | |
d9d166c2 | 873 | mddev->clevel[0] = 0; |
1da177e4 LT |
874 | mddev->layout = sb->layout; |
875 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 876 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 877 | mddev->events = ev1; |
9223214e | 878 | mddev->bitmap_offset = 0; |
36fa3063 | 879 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 880 | |
f6705578 N |
881 | if (mddev->minor_version >= 91) { |
882 | mddev->reshape_position = sb->reshape_position; | |
883 | mddev->delta_disks = sb->delta_disks; | |
884 | mddev->new_level = sb->new_level; | |
885 | mddev->new_layout = sb->new_layout; | |
886 | mddev->new_chunk = sb->new_chunk; | |
887 | } else { | |
888 | mddev->reshape_position = MaxSector; | |
889 | mddev->delta_disks = 0; | |
890 | mddev->new_level = mddev->level; | |
891 | mddev->new_layout = mddev->layout; | |
892 | mddev->new_chunk = mddev->chunk_size; | |
893 | } | |
894 | ||
1da177e4 LT |
895 | if (sb->state & (1<<MD_SB_CLEAN)) |
896 | mddev->recovery_cp = MaxSector; | |
897 | else { | |
898 | if (sb->events_hi == sb->cp_events_hi && | |
899 | sb->events_lo == sb->cp_events_lo) { | |
900 | mddev->recovery_cp = sb->recovery_cp; | |
901 | } else | |
902 | mddev->recovery_cp = 0; | |
903 | } | |
904 | ||
905 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
906 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
907 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
908 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
909 | ||
910 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
911 | |
912 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 913 | mddev->bitmap_file == NULL) |
36fa3063 | 914 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 915 | |
41158c7e N |
916 | } else if (mddev->pers == NULL) { |
917 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
918 | ++ev1; |
919 | if (ev1 < mddev->events) | |
920 | return -EINVAL; | |
41158c7e N |
921 | } else if (mddev->bitmap) { |
922 | /* if adding to array with a bitmap, then we can accept an | |
923 | * older device ... but not too old. | |
924 | */ | |
41158c7e N |
925 | if (ev1 < mddev->bitmap->events_cleared) |
926 | return 0; | |
07d84d10 N |
927 | } else { |
928 | if (ev1 < mddev->events) | |
929 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
930 | return 0; | |
931 | } | |
41158c7e | 932 | |
1da177e4 | 933 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
934 | desc = sb->disks + rdev->desc_nr; |
935 | ||
936 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 937 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
938 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
939 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 940 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
941 | rdev->raid_disk = desc->raid_disk; |
942 | } | |
8ddf9efe N |
943 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
944 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 945 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 946 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
947 | return 0; |
948 | } | |
949 | ||
950 | /* | |
951 | * sync_super for 0.90.0 | |
952 | */ | |
953 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
954 | { | |
955 | mdp_super_t *sb; | |
1da177e4 LT |
956 | mdk_rdev_t *rdev2; |
957 | int next_spare = mddev->raid_disks; | |
19133a42 | 958 | |
1da177e4 LT |
959 | |
960 | /* make rdev->sb match mddev data.. | |
961 | * | |
962 | * 1/ zero out disks | |
963 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
964 | * 3/ any empty disks < next_spare become removed | |
965 | * | |
966 | * disks[0] gets initialised to REMOVED because | |
967 | * we cannot be sure from other fields if it has | |
968 | * been initialised or not. | |
969 | */ | |
970 | int i; | |
971 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
972 | ||
61181565 N |
973 | rdev->sb_size = MD_SB_BYTES; |
974 | ||
1da177e4 LT |
975 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
976 | ||
977 | memset(sb, 0, sizeof(*sb)); | |
978 | ||
979 | sb->md_magic = MD_SB_MAGIC; | |
980 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
981 | sb->patch_version = mddev->patch_version; |
982 | sb->gvalid_words = 0; /* ignored */ | |
983 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
984 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
985 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
986 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
987 | ||
988 | sb->ctime = mddev->ctime; | |
989 | sb->level = mddev->level; | |
58c0fed4 | 990 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
991 | sb->raid_disks = mddev->raid_disks; |
992 | sb->md_minor = mddev->md_minor; | |
e691063a | 993 | sb->not_persistent = 0; |
1da177e4 LT |
994 | sb->utime = mddev->utime; |
995 | sb->state = 0; | |
996 | sb->events_hi = (mddev->events>>32); | |
997 | sb->events_lo = (u32)mddev->events; | |
998 | ||
f6705578 N |
999 | if (mddev->reshape_position == MaxSector) |
1000 | sb->minor_version = 90; | |
1001 | else { | |
1002 | sb->minor_version = 91; | |
1003 | sb->reshape_position = mddev->reshape_position; | |
1004 | sb->new_level = mddev->new_level; | |
1005 | sb->delta_disks = mddev->delta_disks; | |
1006 | sb->new_layout = mddev->new_layout; | |
1007 | sb->new_chunk = mddev->new_chunk; | |
1008 | } | |
1009 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1010 | if (mddev->in_sync) |
1011 | { | |
1012 | sb->recovery_cp = mddev->recovery_cp; | |
1013 | sb->cp_events_hi = (mddev->events>>32); | |
1014 | sb->cp_events_lo = (u32)mddev->events; | |
1015 | if (mddev->recovery_cp == MaxSector) | |
1016 | sb->state = (1<< MD_SB_CLEAN); | |
1017 | } else | |
1018 | sb->recovery_cp = 0; | |
1019 | ||
1020 | sb->layout = mddev->layout; | |
1021 | sb->chunk_size = mddev->chunk_size; | |
1022 | ||
a654b9d8 N |
1023 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
1024 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
1025 | ||
1da177e4 | 1026 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1027 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1028 | mdp_disk_t *d; |
86e6ffdd | 1029 | int desc_nr; |
b2d444d7 N |
1030 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
1031 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 1032 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1033 | else |
86e6ffdd | 1034 | desc_nr = next_spare++; |
19133a42 | 1035 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1036 | d = &sb->disks[rdev2->desc_nr]; |
1037 | nr_disks++; | |
1038 | d->number = rdev2->desc_nr; | |
1039 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1040 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
1041 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
1042 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
1043 | d->raid_disk = rdev2->raid_disk; |
1044 | else | |
1045 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1046 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1047 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 1048 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
1049 | d->state = (1<<MD_DISK_ACTIVE); |
1050 | d->state |= (1<<MD_DISK_SYNC); | |
1051 | active++; | |
1052 | working++; | |
1053 | } else { | |
1054 | d->state = 0; | |
1055 | spare++; | |
1056 | working++; | |
1057 | } | |
8ddf9efe N |
1058 | if (test_bit(WriteMostly, &rdev2->flags)) |
1059 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1060 | } |
1da177e4 LT |
1061 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1062 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1063 | mdp_disk_t *d = &sb->disks[i]; | |
1064 | if (d->state == 0 && d->number == 0) { | |
1065 | d->number = i; | |
1066 | d->raid_disk = i; | |
1067 | d->state = (1<<MD_DISK_REMOVED); | |
1068 | d->state |= (1<<MD_DISK_FAULTY); | |
1069 | failed++; | |
1070 | } | |
1071 | } | |
1072 | sb->nr_disks = nr_disks; | |
1073 | sb->active_disks = active; | |
1074 | sb->working_disks = working; | |
1075 | sb->failed_disks = failed; | |
1076 | sb->spare_disks = spare; | |
1077 | ||
1078 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1079 | sb->sb_csum = calc_sb_csum(sb); | |
1080 | } | |
1081 | ||
0cd17fec CW |
1082 | /* |
1083 | * rdev_size_change for 0.90.0 | |
1084 | */ | |
1085 | static unsigned long long | |
15f4a5fd | 1086 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1087 | { |
58c0fed4 | 1088 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1089 | return 0; /* component must fit device */ |
0cd17fec CW |
1090 | if (rdev->mddev->bitmap_offset) |
1091 | return 0; /* can't move bitmap */ | |
0f420358 | 1092 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1093 | if (!num_sectors || num_sectors > rdev->sb_start) |
1094 | num_sectors = rdev->sb_start; | |
0f420358 | 1095 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1096 | rdev->sb_page); |
1097 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1098 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1099 | } |
1100 | ||
1101 | ||
1da177e4 LT |
1102 | /* |
1103 | * version 1 superblock | |
1104 | */ | |
1105 | ||
1c05b4bc | 1106 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1107 | { |
1c05b4bc N |
1108 | __le32 disk_csum; |
1109 | u32 csum; | |
1da177e4 LT |
1110 | unsigned long long newcsum; |
1111 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1112 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1113 | int i; |
1114 | ||
1115 | disk_csum = sb->sb_csum; | |
1116 | sb->sb_csum = 0; | |
1117 | newcsum = 0; | |
1118 | for (i=0; size>=4; size -= 4 ) | |
1119 | newcsum += le32_to_cpu(*isuper++); | |
1120 | ||
1121 | if (size == 2) | |
1c05b4bc | 1122 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1123 | |
1124 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1125 | sb->sb_csum = disk_csum; | |
1126 | return cpu_to_le32(csum); | |
1127 | } | |
1128 | ||
1129 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1130 | { | |
1131 | struct mdp_superblock_1 *sb; | |
1132 | int ret; | |
0f420358 | 1133 | sector_t sb_start; |
1da177e4 | 1134 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1135 | int bmask; |
1da177e4 LT |
1136 | |
1137 | /* | |
0f420358 | 1138 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1139 | * It is always aligned to a 4K boundary and |
1140 | * depeding on minor_version, it can be: | |
1141 | * 0: At least 8K, but less than 12K, from end of device | |
1142 | * 1: At start of device | |
1143 | * 2: 4K from start of device. | |
1144 | */ | |
1145 | switch(minor_version) { | |
1146 | case 0: | |
0f420358 AN |
1147 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1148 | sb_start -= 8*2; | |
1149 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1150 | break; |
1151 | case 1: | |
0f420358 | 1152 | sb_start = 0; |
1da177e4 LT |
1153 | break; |
1154 | case 2: | |
0f420358 | 1155 | sb_start = 8; |
1da177e4 LT |
1156 | break; |
1157 | default: | |
1158 | return -EINVAL; | |
1159 | } | |
0f420358 | 1160 | rdev->sb_start = sb_start; |
1da177e4 | 1161 | |
0002b271 N |
1162 | /* superblock is rarely larger than 1K, but it can be larger, |
1163 | * and it is safe to read 4k, so we do that | |
1164 | */ | |
1165 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1166 | if (ret) return ret; |
1167 | ||
1168 | ||
1169 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1170 | ||
1171 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1172 | sb->major_version != cpu_to_le32(1) || | |
1173 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1174 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1175 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1176 | return -EINVAL; |
1177 | ||
1178 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1179 | printk("md: invalid superblock checksum on %s\n", | |
1180 | bdevname(rdev->bdev,b)); | |
1181 | return -EINVAL; | |
1182 | } | |
1183 | if (le64_to_cpu(sb->data_size) < 10) { | |
1184 | printk("md: data_size too small on %s\n", | |
1185 | bdevname(rdev->bdev,b)); | |
1186 | return -EINVAL; | |
1187 | } | |
e11e93fa N |
1188 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1189 | if (sb->level != cpu_to_le32(1) && | |
1190 | sb->level != cpu_to_le32(4) && | |
1191 | sb->level != cpu_to_le32(5) && | |
1192 | sb->level != cpu_to_le32(6) && | |
1193 | sb->level != cpu_to_le32(10)) { | |
1194 | printk(KERN_WARNING | |
1195 | "md: bitmaps not supported for this level.\n"); | |
1196 | return -EINVAL; | |
1197 | } | |
1198 | } | |
1199 | ||
1da177e4 LT |
1200 | rdev->preferred_minor = 0xffff; |
1201 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1202 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1203 | |
0002b271 | 1204 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1205 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1206 | if (rdev->sb_size & bmask) |
a1801f85 N |
1207 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1208 | ||
1209 | if (minor_version | |
0f420358 | 1210 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1211 | return -EINVAL; |
0002b271 | 1212 | |
31b65a0d N |
1213 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1214 | rdev->desc_nr = -1; | |
1215 | else | |
1216 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1217 | ||
9a7b2b0f | 1218 | if (!refdev) { |
8ed75463 | 1219 | ret = 1; |
9a7b2b0f | 1220 | } else { |
1da177e4 LT |
1221 | __u64 ev1, ev2; |
1222 | struct mdp_superblock_1 *refsb = | |
1223 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1224 | ||
1225 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1226 | sb->level != refsb->level || | |
1227 | sb->layout != refsb->layout || | |
1228 | sb->chunksize != refsb->chunksize) { | |
1229 | printk(KERN_WARNING "md: %s has strangely different" | |
1230 | " superblock to %s\n", | |
1231 | bdevname(rdev->bdev,b), | |
1232 | bdevname(refdev->bdev,b2)); | |
1233 | return -EINVAL; | |
1234 | } | |
1235 | ev1 = le64_to_cpu(sb->events); | |
1236 | ev2 = le64_to_cpu(refsb->events); | |
1237 | ||
1238 | if (ev1 > ev2) | |
8ed75463 N |
1239 | ret = 1; |
1240 | else | |
1241 | ret = 0; | |
1da177e4 | 1242 | } |
a1801f85 | 1243 | if (minor_version) |
dd8ac336 AN |
1244 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
1245 | le64_to_cpu(sb->data_offset); | |
1da177e4 | 1246 | else |
dd8ac336 AN |
1247 | rdev->sectors = rdev->sb_start; |
1248 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1249 | return -EINVAL; |
dd8ac336 | 1250 | rdev->sectors = le64_to_cpu(sb->data_size); |
1da177e4 | 1251 | if (le32_to_cpu(sb->chunksize)) |
dd8ac336 | 1252 | rdev->sectors &= ~((sector_t)le32_to_cpu(sb->chunksize) - 1); |
2bf071bf | 1253 | |
dd8ac336 | 1254 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1255 | return -EINVAL; |
8ed75463 | 1256 | return ret; |
1da177e4 LT |
1257 | } |
1258 | ||
1259 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1260 | { | |
1261 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1262 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1263 | |
41158c7e | 1264 | rdev->raid_disk = -1; |
c5d79adb N |
1265 | clear_bit(Faulty, &rdev->flags); |
1266 | clear_bit(In_sync, &rdev->flags); | |
1267 | clear_bit(WriteMostly, &rdev->flags); | |
1268 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1269 | ||
1da177e4 LT |
1270 | if (mddev->raid_disks == 0) { |
1271 | mddev->major_version = 1; | |
1272 | mddev->patch_version = 0; | |
e691063a | 1273 | mddev->external = 0; |
1da177e4 LT |
1274 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1275 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1276 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1277 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1278 | mddev->clevel[0] = 0; |
1da177e4 LT |
1279 | mddev->layout = le32_to_cpu(sb->layout); |
1280 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1281 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1282 | mddev->events = ev1; |
9223214e | 1283 | mddev->bitmap_offset = 0; |
29fc7e3e | 1284 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1285 | |
1286 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1287 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1288 | ||
1289 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1290 | |
71c0805c | 1291 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1292 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1293 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1294 | |
f6705578 N |
1295 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1296 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1297 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1298 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1299 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1300 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1301 | } else { | |
1302 | mddev->reshape_position = MaxSector; | |
1303 | mddev->delta_disks = 0; | |
1304 | mddev->new_level = mddev->level; | |
1305 | mddev->new_layout = mddev->layout; | |
1306 | mddev->new_chunk = mddev->chunk_size; | |
1307 | } | |
1308 | ||
41158c7e N |
1309 | } else if (mddev->pers == NULL) { |
1310 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1311 | ++ev1; |
1312 | if (ev1 < mddev->events) | |
1313 | return -EINVAL; | |
41158c7e N |
1314 | } else if (mddev->bitmap) { |
1315 | /* If adding to array with a bitmap, then we can accept an | |
1316 | * older device, but not too old. | |
1317 | */ | |
41158c7e N |
1318 | if (ev1 < mddev->bitmap->events_cleared) |
1319 | return 0; | |
07d84d10 N |
1320 | } else { |
1321 | if (ev1 < mddev->events) | |
1322 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1323 | return 0; | |
1324 | } | |
1da177e4 LT |
1325 | if (mddev->level != LEVEL_MULTIPATH) { |
1326 | int role; | |
1da177e4 LT |
1327 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1328 | switch(role) { | |
1329 | case 0xffff: /* spare */ | |
1da177e4 LT |
1330 | break; |
1331 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1332 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1333 | break; |
1334 | default: | |
5fd6c1dc N |
1335 | if ((le32_to_cpu(sb->feature_map) & |
1336 | MD_FEATURE_RECOVERY_OFFSET)) | |
1337 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1338 | else | |
1339 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1340 | rdev->raid_disk = role; |
1341 | break; | |
1342 | } | |
8ddf9efe N |
1343 | if (sb->devflags & WriteMostly1) |
1344 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1345 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1346 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1347 | |
1da177e4 LT |
1348 | return 0; |
1349 | } | |
1350 | ||
1351 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1352 | { | |
1353 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1354 | mdk_rdev_t *rdev2; |
1355 | int max_dev, i; | |
1356 | /* make rdev->sb match mddev and rdev data. */ | |
1357 | ||
1358 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1359 | ||
1360 | sb->feature_map = 0; | |
1361 | sb->pad0 = 0; | |
5fd6c1dc | 1362 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1363 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1364 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1365 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1366 | ||
1367 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1368 | sb->events = cpu_to_le64(mddev->events); | |
1369 | if (mddev->in_sync) | |
1370 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1371 | else | |
1372 | sb->resync_offset = cpu_to_le64(0); | |
1373 | ||
1c05b4bc | 1374 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1375 | |
f0ca340c | 1376 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1377 | sb->size = cpu_to_le64(mddev->dev_sectors); |
f0ca340c | 1378 | |
a654b9d8 N |
1379 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1380 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1381 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1382 | } |
5fd6c1dc N |
1383 | |
1384 | if (rdev->raid_disk >= 0 && | |
97e4f42d N |
1385 | !test_bit(In_sync, &rdev->flags)) { |
1386 | if (mddev->curr_resync_completed > rdev->recovery_offset) | |
1387 | rdev->recovery_offset = mddev->curr_resync_completed; | |
1388 | if (rdev->recovery_offset > 0) { | |
1389 | sb->feature_map |= | |
1390 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1391 | sb->recovery_offset = | |
1392 | cpu_to_le64(rdev->recovery_offset); | |
1393 | } | |
5fd6c1dc N |
1394 | } |
1395 | ||
f6705578 N |
1396 | if (mddev->reshape_position != MaxSector) { |
1397 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1398 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1399 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1400 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1401 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1402 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1403 | } | |
a654b9d8 | 1404 | |
1da177e4 | 1405 | max_dev = 0; |
159ec1fc | 1406 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1407 | if (rdev2->desc_nr+1 > max_dev) |
1408 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1409 | |
1410 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1411 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1412 | for (i=0; i<max_dev;i++) |
1413 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1414 | ||
159ec1fc | 1415 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1416 | i = rdev2->desc_nr; |
b2d444d7 | 1417 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1418 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1419 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1420 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1421 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1422 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1423 | else |
1424 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1425 | } | |
1426 | ||
1da177e4 LT |
1427 | sb->sb_csum = calc_sb_1_csum(sb); |
1428 | } | |
1429 | ||
0cd17fec | 1430 | static unsigned long long |
15f4a5fd | 1431 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1432 | { |
1433 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1434 | sector_t max_sectors; |
58c0fed4 | 1435 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1436 | return 0; /* component must fit device */ |
0f420358 | 1437 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1438 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1439 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1440 | max_sectors -= rdev->data_offset; | |
1441 | if (!num_sectors || num_sectors > max_sectors) | |
1442 | num_sectors = max_sectors; | |
0cd17fec CW |
1443 | } else if (rdev->mddev->bitmap_offset) { |
1444 | /* minor version 0 with bitmap we can't move */ | |
1445 | return 0; | |
1446 | } else { | |
1447 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1448 | sector_t sb_start; |
1449 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1450 | sb_start &= ~(sector_t)(4*2 - 1); | |
dd8ac336 | 1451 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1452 | if (!num_sectors || num_sectors > max_sectors) |
1453 | num_sectors = max_sectors; | |
0f420358 | 1454 | rdev->sb_start = sb_start; |
0cd17fec CW |
1455 | } |
1456 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1457 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1458 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1459 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1460 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1461 | rdev->sb_page); |
1462 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1463 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1464 | } |
1da177e4 | 1465 | |
75c96f85 | 1466 | static struct super_type super_types[] = { |
1da177e4 LT |
1467 | [0] = { |
1468 | .name = "0.90.0", | |
1469 | .owner = THIS_MODULE, | |
0cd17fec CW |
1470 | .load_super = super_90_load, |
1471 | .validate_super = super_90_validate, | |
1472 | .sync_super = super_90_sync, | |
1473 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1474 | }, |
1475 | [1] = { | |
1476 | .name = "md-1", | |
1477 | .owner = THIS_MODULE, | |
0cd17fec CW |
1478 | .load_super = super_1_load, |
1479 | .validate_super = super_1_validate, | |
1480 | .sync_super = super_1_sync, | |
1481 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1482 | }, |
1483 | }; | |
1da177e4 LT |
1484 | |
1485 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1486 | { | |
7dd5e7c3 | 1487 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1488 | |
4b80991c N |
1489 | rcu_read_lock(); |
1490 | rdev_for_each_rcu(rdev, mddev1) | |
1491 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1492 | if (rdev->bdev->bd_contains == |
4b80991c N |
1493 | rdev2->bdev->bd_contains) { |
1494 | rcu_read_unlock(); | |
7dd5e7c3 | 1495 | return 1; |
4b80991c N |
1496 | } |
1497 | rcu_read_unlock(); | |
1da177e4 LT |
1498 | return 0; |
1499 | } | |
1500 | ||
1501 | static LIST_HEAD(pending_raid_disks); | |
1502 | ||
3f9d99c1 MP |
1503 | static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev) |
1504 | { | |
1505 | struct mdk_personality *pers = mddev->pers; | |
1506 | struct gendisk *disk = mddev->gendisk; | |
1507 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); | |
1508 | struct blk_integrity *bi_mddev = blk_get_integrity(disk); | |
1509 | ||
1510 | /* Data integrity passthrough not supported on RAID 4, 5 and 6 */ | |
1511 | if (pers && pers->level >= 4 && pers->level <= 6) | |
1512 | return; | |
1513 | ||
1514 | /* If rdev is integrity capable, register profile for mddev */ | |
1515 | if (!bi_mddev && bi_rdev) { | |
1516 | if (blk_integrity_register(disk, bi_rdev)) | |
1517 | printk(KERN_ERR "%s: %s Could not register integrity!\n", | |
1518 | __func__, disk->disk_name); | |
1519 | else | |
1520 | printk(KERN_NOTICE "Enabling data integrity on %s\n", | |
1521 | disk->disk_name); | |
1522 | return; | |
1523 | } | |
1524 | ||
1525 | /* Check that mddev and rdev have matching profiles */ | |
1526 | if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) { | |
1527 | printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__, | |
1528 | disk->disk_name, rdev->bdev->bd_disk->disk_name); | |
1529 | printk(KERN_NOTICE "Disabling data integrity on %s\n", | |
1530 | disk->disk_name); | |
1531 | blk_integrity_unregister(disk); | |
1532 | } | |
1533 | } | |
1534 | ||
1da177e4 LT |
1535 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1536 | { | |
7dd5e7c3 | 1537 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1538 | struct kobject *ko; |
1edf80d3 | 1539 | char *s; |
5e55e2f5 | 1540 | int err; |
1da177e4 LT |
1541 | |
1542 | if (rdev->mddev) { | |
1543 | MD_BUG(); | |
1544 | return -EINVAL; | |
1545 | } | |
11e2ede0 DW |
1546 | |
1547 | /* prevent duplicates */ | |
1548 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1549 | return -EEXIST; | |
1550 | ||
dd8ac336 AN |
1551 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1552 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1553 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1554 | if (mddev->pers) { |
1555 | /* Cannot change size, so fail | |
1556 | * If mddev->level <= 0, then we don't care | |
1557 | * about aligning sizes (e.g. linear) | |
1558 | */ | |
1559 | if (mddev->level > 0) | |
1560 | return -ENOSPC; | |
1561 | } else | |
dd8ac336 | 1562 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1563 | } |
1da177e4 LT |
1564 | |
1565 | /* Verify rdev->desc_nr is unique. | |
1566 | * If it is -1, assign a free number, else | |
1567 | * check number is not in use | |
1568 | */ | |
1569 | if (rdev->desc_nr < 0) { | |
1570 | int choice = 0; | |
1571 | if (mddev->pers) choice = mddev->raid_disks; | |
1572 | while (find_rdev_nr(mddev, choice)) | |
1573 | choice++; | |
1574 | rdev->desc_nr = choice; | |
1575 | } else { | |
1576 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1577 | return -EBUSY; | |
1578 | } | |
de01dfad N |
1579 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1580 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1581 | mdname(mddev), mddev->max_disks); | |
1582 | return -EBUSY; | |
1583 | } | |
19133a42 | 1584 | bdevname(rdev->bdev,b); |
649316b2 | 1585 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1586 | *s = '!'; |
649316b2 | 1587 | |
1da177e4 | 1588 | rdev->mddev = mddev; |
19133a42 | 1589 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1590 | |
b2d6db58 | 1591 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1592 | goto fail; |
86e6ffdd | 1593 | |
0762b8bd | 1594 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1595 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1596 | kobject_del(&rdev->kobj); | |
1597 | goto fail; | |
1598 | } | |
3c0ee63a N |
1599 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1600 | ||
4b80991c | 1601 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1602 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1603 | |
1604 | /* May as well allow recovery to be retried once */ | |
1605 | mddev->recovery_disabled = 0; | |
3f9d99c1 MP |
1606 | |
1607 | md_integrity_check(rdev, mddev); | |
1da177e4 | 1608 | return 0; |
5e55e2f5 N |
1609 | |
1610 | fail: | |
1611 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1612 | b, mdname(mddev)); | |
1613 | return err; | |
1da177e4 LT |
1614 | } |
1615 | ||
177a99b2 | 1616 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1617 | { |
1618 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1619 | kobject_del(&rdev->kobj); | |
177a99b2 | 1620 | kobject_put(&rdev->kobj); |
5792a285 N |
1621 | } |
1622 | ||
1da177e4 LT |
1623 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1624 | { | |
1625 | char b[BDEVNAME_SIZE]; | |
1626 | if (!rdev->mddev) { | |
1627 | MD_BUG(); | |
1628 | return; | |
1629 | } | |
5463c790 | 1630 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1631 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1632 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1633 | rdev->mddev = NULL; | |
86e6ffdd | 1634 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1635 | sysfs_put(rdev->sysfs_state); |
1636 | rdev->sysfs_state = NULL; | |
5792a285 | 1637 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1638 | * writing to 'remove' to "dev/state". We also need |
1639 | * to delay it due to rcu usage. | |
5792a285 | 1640 | */ |
4b80991c | 1641 | synchronize_rcu(); |
177a99b2 N |
1642 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1643 | kobject_get(&rdev->kobj); | |
5792a285 | 1644 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1645 | } |
1646 | ||
1647 | /* | |
1648 | * prevent the device from being mounted, repartitioned or | |
1649 | * otherwise reused by a RAID array (or any other kernel | |
1650 | * subsystem), by bd_claiming the device. | |
1651 | */ | |
c5d79adb | 1652 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1653 | { |
1654 | int err = 0; | |
1655 | struct block_device *bdev; | |
1656 | char b[BDEVNAME_SIZE]; | |
1657 | ||
2e7b651d | 1658 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1659 | if (IS_ERR(bdev)) { |
1660 | printk(KERN_ERR "md: could not open %s.\n", | |
1661 | __bdevname(dev, b)); | |
1662 | return PTR_ERR(bdev); | |
1663 | } | |
c5d79adb | 1664 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1665 | if (err) { |
1666 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1667 | bdevname(bdev, b)); | |
9a1c3542 | 1668 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1669 | return err; |
1670 | } | |
c5d79adb N |
1671 | if (!shared) |
1672 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1673 | rdev->bdev = bdev; |
1674 | return err; | |
1675 | } | |
1676 | ||
1677 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1678 | { | |
1679 | struct block_device *bdev = rdev->bdev; | |
1680 | rdev->bdev = NULL; | |
1681 | if (!bdev) | |
1682 | MD_BUG(); | |
1683 | bd_release(bdev); | |
9a1c3542 | 1684 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1685 | } |
1686 | ||
1687 | void md_autodetect_dev(dev_t dev); | |
1688 | ||
1689 | static void export_rdev(mdk_rdev_t * rdev) | |
1690 | { | |
1691 | char b[BDEVNAME_SIZE]; | |
1692 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1693 | bdevname(rdev->bdev,b)); | |
1694 | if (rdev->mddev) | |
1695 | MD_BUG(); | |
1696 | free_disk_sb(rdev); | |
1da177e4 | 1697 | #ifndef MODULE |
d0fae18f N |
1698 | if (test_bit(AutoDetected, &rdev->flags)) |
1699 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1700 | #endif |
1701 | unlock_rdev(rdev); | |
86e6ffdd | 1702 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1703 | } |
1704 | ||
1705 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1706 | { | |
1707 | unbind_rdev_from_array(rdev); | |
1708 | export_rdev(rdev); | |
1709 | } | |
1710 | ||
1711 | static void export_array(mddev_t *mddev) | |
1712 | { | |
159ec1fc | 1713 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1714 | |
d089c6af | 1715 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1716 | if (!rdev->mddev) { |
1717 | MD_BUG(); | |
1718 | continue; | |
1719 | } | |
1720 | kick_rdev_from_array(rdev); | |
1721 | } | |
1722 | if (!list_empty(&mddev->disks)) | |
1723 | MD_BUG(); | |
1724 | mddev->raid_disks = 0; | |
1725 | mddev->major_version = 0; | |
1726 | } | |
1727 | ||
1728 | static void print_desc(mdp_disk_t *desc) | |
1729 | { | |
1730 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1731 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1732 | } | |
1733 | ||
cd2ac932 | 1734 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1735 | { |
1736 | int i; | |
1737 | ||
1738 | printk(KERN_INFO | |
1739 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1740 | sb->major_version, sb->minor_version, sb->patch_version, | |
1741 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1742 | sb->ctime); | |
1743 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1744 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1745 | sb->md_minor, sb->layout, sb->chunk_size); | |
1746 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1747 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1748 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1749 | sb->failed_disks, sb->spare_disks, | |
1750 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1751 | ||
1752 | printk(KERN_INFO); | |
1753 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1754 | mdp_disk_t *desc; | |
1755 | ||
1756 | desc = sb->disks + i; | |
1757 | if (desc->number || desc->major || desc->minor || | |
1758 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1759 | printk(" D %2d: ", i); | |
1760 | print_desc(desc); | |
1761 | } | |
1762 | } | |
1763 | printk(KERN_INFO "md: THIS: "); | |
1764 | print_desc(&sb->this_disk); | |
cd2ac932 | 1765 | } |
1da177e4 | 1766 | |
cd2ac932 CR |
1767 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1768 | { | |
1769 | __u8 *uuid; | |
1770 | ||
1771 | uuid = sb->set_uuid; | |
1772 | printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1773 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1774 | KERN_INFO "md: Name: \"%s\" CT:%llu\n", | |
1775 | le32_to_cpu(sb->major_version), | |
1776 | le32_to_cpu(sb->feature_map), | |
1777 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1778 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1779 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1780 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1781 | sb->set_name, | |
1782 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1783 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1784 | ||
1785 | uuid = sb->device_uuid; | |
1786 | printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
1787 | " RO:%llu\n" | |
1788 | KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" | |
1789 | ":%02x%02x%02x%02x%02x%02x\n" | |
1790 | KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1791 | KERN_INFO "md: (MaxDev:%u) \n", | |
1792 | le32_to_cpu(sb->level), | |
1793 | (unsigned long long)le64_to_cpu(sb->size), | |
1794 | le32_to_cpu(sb->raid_disks), | |
1795 | le32_to_cpu(sb->layout), | |
1796 | le32_to_cpu(sb->chunksize), | |
1797 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1798 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1799 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1800 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1801 | le32_to_cpu(sb->dev_number), | |
1802 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1803 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1804 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1805 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1806 | sb->devflags, | |
1807 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1808 | (unsigned long long)le64_to_cpu(sb->events), | |
1809 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1810 | le32_to_cpu(sb->sb_csum), | |
1811 | le32_to_cpu(sb->max_dev) | |
1812 | ); | |
1da177e4 LT |
1813 | } |
1814 | ||
cd2ac932 | 1815 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1816 | { |
1817 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
1818 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
1819 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
1820 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1821 | rdev->desc_nr); | |
1da177e4 | 1822 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1823 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1824 | switch (major_version) { | |
1825 | case 0: | |
1826 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1827 | break; | |
1828 | case 1: | |
1829 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1830 | break; | |
1831 | } | |
1da177e4 LT |
1832 | } else |
1833 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1834 | } | |
1835 | ||
5e56341d | 1836 | static void md_print_devices(void) |
1da177e4 | 1837 | { |
159ec1fc | 1838 | struct list_head *tmp; |
1da177e4 LT |
1839 | mdk_rdev_t *rdev; |
1840 | mddev_t *mddev; | |
1841 | char b[BDEVNAME_SIZE]; | |
1842 | ||
1843 | printk("\n"); | |
1844 | printk("md: **********************************\n"); | |
1845 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1846 | printk("md: **********************************\n"); | |
29ac4aa3 | 1847 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1848 | |
32a7627c N |
1849 | if (mddev->bitmap) |
1850 | bitmap_print_sb(mddev->bitmap); | |
1851 | else | |
1852 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 1853 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
1854 | printk("<%s>", bdevname(rdev->bdev,b)); |
1855 | printk("\n"); | |
1856 | ||
159ec1fc | 1857 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 1858 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
1859 | } |
1860 | printk("md: **********************************\n"); | |
1861 | printk("\n"); | |
1862 | } | |
1863 | ||
1864 | ||
42543769 | 1865 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1866 | { |
42543769 N |
1867 | /* Update each superblock (in-memory image), but |
1868 | * if we are allowed to, skip spares which already | |
1869 | * have the right event counter, or have one earlier | |
1870 | * (which would mean they aren't being marked as dirty | |
1871 | * with the rest of the array) | |
1872 | */ | |
1da177e4 | 1873 | mdk_rdev_t *rdev; |
1da177e4 | 1874 | |
159ec1fc | 1875 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
1876 | if (rdev->sb_events == mddev->events || |
1877 | (nospares && | |
1878 | rdev->raid_disk < 0 && | |
1879 | (rdev->sb_events&1)==0 && | |
1880 | rdev->sb_events+1 == mddev->events)) { | |
1881 | /* Don't update this superblock */ | |
1882 | rdev->sb_loaded = 2; | |
1883 | } else { | |
1884 | super_types[mddev->major_version]. | |
1885 | sync_super(mddev, rdev); | |
1886 | rdev->sb_loaded = 1; | |
1887 | } | |
1da177e4 LT |
1888 | } |
1889 | } | |
1890 | ||
850b2b42 | 1891 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1892 | { |
1da177e4 | 1893 | mdk_rdev_t *rdev; |
06d91a5f | 1894 | int sync_req; |
42543769 | 1895 | int nospares = 0; |
1da177e4 | 1896 | |
8377bc80 N |
1897 | if (mddev->external) |
1898 | return; | |
1da177e4 | 1899 | repeat: |
a9701a30 | 1900 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1901 | |
850b2b42 N |
1902 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1903 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1904 | force_change = 1; | |
1905 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1906 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1907 | * though if events isn't the right even/odd, we will have to do | |
1908 | * spares after all | |
1909 | */ | |
1910 | nospares = 1; | |
1911 | if (force_change) | |
1912 | nospares = 0; | |
1913 | if (mddev->degraded) | |
84692195 N |
1914 | /* If the array is degraded, then skipping spares is both |
1915 | * dangerous and fairly pointless. | |
1916 | * Dangerous because a device that was removed from the array | |
1917 | * might have a event_count that still looks up-to-date, | |
1918 | * so it can be re-added without a resync. | |
1919 | * Pointless because if there are any spares to skip, | |
1920 | * then a recovery will happen and soon that array won't | |
1921 | * be degraded any more and the spare can go back to sleep then. | |
1922 | */ | |
850b2b42 | 1923 | nospares = 0; |
84692195 | 1924 | |
06d91a5f | 1925 | sync_req = mddev->in_sync; |
1da177e4 | 1926 | mddev->utime = get_seconds(); |
42543769 N |
1927 | |
1928 | /* If this is just a dirty<->clean transition, and the array is clean | |
1929 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1930 | if (nospares |
42543769 | 1931 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1932 | && (mddev->events & 1) |
1933 | && mddev->events != 1) | |
42543769 N |
1934 | mddev->events--; |
1935 | else { | |
1936 | /* otherwise we have to go forward and ... */ | |
1937 | mddev->events ++; | |
1938 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1939 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1940 | if ((mddev->events&1)==0) { | |
1941 | mddev->events++; | |
1942 | nospares = 0; | |
1943 | } | |
1944 | } else { | |
1945 | /* otherwise insist on an even 'events' (for clean states) */ | |
1946 | if ((mddev->events&1)) { | |
1947 | mddev->events++; | |
1948 | nospares = 0; | |
1949 | } | |
1950 | } | |
1951 | } | |
1da177e4 LT |
1952 | |
1953 | if (!mddev->events) { | |
1954 | /* | |
1955 | * oops, this 64-bit counter should never wrap. | |
1956 | * Either we are in around ~1 trillion A.C., assuming | |
1957 | * 1 reboot per second, or we have a bug: | |
1958 | */ | |
1959 | MD_BUG(); | |
1960 | mddev->events --; | |
1961 | } | |
1da177e4 LT |
1962 | |
1963 | /* | |
1964 | * do not write anything to disk if using | |
1965 | * nonpersistent superblocks | |
1966 | */ | |
06d91a5f | 1967 | if (!mddev->persistent) { |
e691063a N |
1968 | if (!mddev->external) |
1969 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1970 | ||
a9701a30 | 1971 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1972 | wake_up(&mddev->sb_wait); |
1da177e4 | 1973 | return; |
06d91a5f | 1974 | } |
e691063a | 1975 | sync_sbs(mddev, nospares); |
a9701a30 | 1976 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1977 | |
1978 | dprintk(KERN_INFO | |
1979 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1980 | mdname(mddev),mddev->in_sync); | |
1981 | ||
4ad13663 | 1982 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 1983 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
1984 | char b[BDEVNAME_SIZE]; |
1985 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1986 | if (rdev->sb_loaded != 1) |
1987 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1988 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1989 | dprintk("(skipping faulty "); |
1990 | ||
1991 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1992 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1993 | md_super_write(mddev,rdev, |
0f420358 | 1994 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
1995 | rdev->sb_page); |
1996 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1997 | bdevname(rdev->bdev,b), | |
0f420358 | 1998 | (unsigned long long)rdev->sb_start); |
42543769 | 1999 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2000 | |
1da177e4 LT |
2001 | } else |
2002 | dprintk(")\n"); | |
7bfa19f2 | 2003 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2004 | /* only need to write one superblock... */ |
2005 | break; | |
2006 | } | |
a9701a30 | 2007 | md_super_wait(mddev); |
850b2b42 | 2008 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2009 | |
a9701a30 | 2010 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2011 | if (mddev->in_sync != sync_req || |
2012 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2013 | /* have to write it out again */ |
a9701a30 | 2014 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2015 | goto repeat; |
2016 | } | |
850b2b42 | 2017 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2018 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2019 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2020 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2021 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2022 | |
1da177e4 LT |
2023 | } |
2024 | ||
7f6ce769 | 2025 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2026 | * We want to accept with case. For this we use cmd_match. |
2027 | */ | |
2028 | static int cmd_match(const char *cmd, const char *str) | |
2029 | { | |
2030 | /* See if cmd, written into a sysfs file, matches | |
2031 | * str. They must either be the same, or cmd can | |
2032 | * have a trailing newline | |
2033 | */ | |
2034 | while (*cmd && *str && *cmd == *str) { | |
2035 | cmd++; | |
2036 | str++; | |
2037 | } | |
2038 | if (*cmd == '\n') | |
2039 | cmd++; | |
2040 | if (*str || *cmd) | |
2041 | return 0; | |
2042 | return 1; | |
2043 | } | |
2044 | ||
86e6ffdd N |
2045 | struct rdev_sysfs_entry { |
2046 | struct attribute attr; | |
2047 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2048 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2049 | }; | |
2050 | ||
2051 | static ssize_t | |
96de1e66 | 2052 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2053 | { |
2054 | char *sep = ""; | |
20a49ff6 | 2055 | size_t len = 0; |
86e6ffdd | 2056 | |
b2d444d7 | 2057 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2058 | len+= sprintf(page+len, "%sfaulty",sep); |
2059 | sep = ","; | |
2060 | } | |
b2d444d7 | 2061 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2062 | len += sprintf(page+len, "%sin_sync",sep); |
2063 | sep = ","; | |
2064 | } | |
f655675b N |
2065 | if (test_bit(WriteMostly, &rdev->flags)) { |
2066 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2067 | sep = ","; | |
2068 | } | |
6bfe0b49 DW |
2069 | if (test_bit(Blocked, &rdev->flags)) { |
2070 | len += sprintf(page+len, "%sblocked", sep); | |
2071 | sep = ","; | |
2072 | } | |
b2d444d7 N |
2073 | if (!test_bit(Faulty, &rdev->flags) && |
2074 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2075 | len += sprintf(page+len, "%sspare", sep); |
2076 | sep = ","; | |
2077 | } | |
2078 | return len+sprintf(page+len, "\n"); | |
2079 | } | |
2080 | ||
45dc2de1 N |
2081 | static ssize_t |
2082 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2083 | { | |
2084 | /* can write | |
2085 | * faulty - simulates and error | |
2086 | * remove - disconnects the device | |
f655675b N |
2087 | * writemostly - sets write_mostly |
2088 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2089 | * blocked - sets the Blocked flag |
2090 | * -blocked - clears the Blocked flag | |
6d56e278 | 2091 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2092 | */ |
2093 | int err = -EINVAL; | |
2094 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2095 | md_error(rdev->mddev, rdev); | |
2096 | err = 0; | |
2097 | } else if (cmd_match(buf, "remove")) { | |
2098 | if (rdev->raid_disk >= 0) | |
2099 | err = -EBUSY; | |
2100 | else { | |
2101 | mddev_t *mddev = rdev->mddev; | |
2102 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2103 | if (mddev->pers) |
2104 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2105 | md_new_event(mddev); |
2106 | err = 0; | |
2107 | } | |
f655675b N |
2108 | } else if (cmd_match(buf, "writemostly")) { |
2109 | set_bit(WriteMostly, &rdev->flags); | |
2110 | err = 0; | |
2111 | } else if (cmd_match(buf, "-writemostly")) { | |
2112 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2113 | err = 0; |
2114 | } else if (cmd_match(buf, "blocked")) { | |
2115 | set_bit(Blocked, &rdev->flags); | |
2116 | err = 0; | |
2117 | } else if (cmd_match(buf, "-blocked")) { | |
2118 | clear_bit(Blocked, &rdev->flags); | |
2119 | wake_up(&rdev->blocked_wait); | |
2120 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2121 | md_wakeup_thread(rdev->mddev->thread); | |
2122 | ||
6d56e278 N |
2123 | err = 0; |
2124 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2125 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2126 | err = 0; |
45dc2de1 | 2127 | } |
3c0ee63a N |
2128 | if (!err && rdev->sysfs_state) |
2129 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
2130 | return err ? err : len; |
2131 | } | |
80ca3a44 N |
2132 | static struct rdev_sysfs_entry rdev_state = |
2133 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2134 | |
4dbcdc75 N |
2135 | static ssize_t |
2136 | errors_show(mdk_rdev_t *rdev, char *page) | |
2137 | { | |
2138 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2139 | } | |
2140 | ||
2141 | static ssize_t | |
2142 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2143 | { | |
2144 | char *e; | |
2145 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2146 | if (*buf && (*e == 0 || *e == '\n')) { | |
2147 | atomic_set(&rdev->corrected_errors, n); | |
2148 | return len; | |
2149 | } | |
2150 | return -EINVAL; | |
2151 | } | |
2152 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2153 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2154 | |
014236d2 N |
2155 | static ssize_t |
2156 | slot_show(mdk_rdev_t *rdev, char *page) | |
2157 | { | |
2158 | if (rdev->raid_disk < 0) | |
2159 | return sprintf(page, "none\n"); | |
2160 | else | |
2161 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2162 | } | |
2163 | ||
2164 | static ssize_t | |
2165 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2166 | { | |
2167 | char *e; | |
c303da6d N |
2168 | int err; |
2169 | char nm[20]; | |
014236d2 N |
2170 | int slot = simple_strtoul(buf, &e, 10); |
2171 | if (strncmp(buf, "none", 4)==0) | |
2172 | slot = -1; | |
2173 | else if (e==buf || (*e && *e!= '\n')) | |
2174 | return -EINVAL; | |
6c2fce2e | 2175 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2176 | /* Setting 'slot' on an active array requires also |
2177 | * updating the 'rd%d' link, and communicating | |
2178 | * with the personality with ->hot_*_disk. | |
2179 | * For now we only support removing | |
2180 | * failed/spare devices. This normally happens automatically, | |
2181 | * but not when the metadata is externally managed. | |
2182 | */ | |
c303da6d N |
2183 | if (rdev->raid_disk == -1) |
2184 | return -EEXIST; | |
2185 | /* personality does all needed checks */ | |
2186 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2187 | return -EINVAL; | |
2188 | err = rdev->mddev->pers-> | |
2189 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2190 | if (err) | |
2191 | return err; | |
2192 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2193 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2194 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2195 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2196 | } else if (rdev->mddev->pers) { |
2197 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2198 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2199 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2200 | */ |
2201 | ||
2202 | if (rdev->raid_disk != -1) | |
2203 | return -EBUSY; | |
2204 | ||
2205 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2206 | return -EINVAL; | |
2207 | ||
159ec1fc | 2208 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2209 | if (rdev2->raid_disk == slot) |
2210 | return -EEXIST; | |
2211 | ||
2212 | rdev->raid_disk = slot; | |
2213 | if (test_bit(In_sync, &rdev->flags)) | |
2214 | rdev->saved_raid_disk = slot; | |
2215 | else | |
2216 | rdev->saved_raid_disk = -1; | |
2217 | err = rdev->mddev->pers-> | |
2218 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2219 | if (err) { |
6c2fce2e | 2220 | rdev->raid_disk = -1; |
6c2fce2e | 2221 | return err; |
52664732 | 2222 | } else |
3c0ee63a | 2223 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2224 | sprintf(nm, "rd%d", rdev->raid_disk); |
2225 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2226 | printk(KERN_WARNING | |
2227 | "md: cannot register " | |
2228 | "%s for %s\n", | |
2229 | nm, mdname(rdev->mddev)); | |
2230 | ||
2231 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2232 | } else { |
2233 | if (slot >= rdev->mddev->raid_disks) | |
2234 | return -ENOSPC; | |
2235 | rdev->raid_disk = slot; | |
2236 | /* assume it is working */ | |
c5d79adb N |
2237 | clear_bit(Faulty, &rdev->flags); |
2238 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2239 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2240 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2241 | } |
014236d2 N |
2242 | return len; |
2243 | } | |
2244 | ||
2245 | ||
2246 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2247 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2248 | |
93c8cad0 N |
2249 | static ssize_t |
2250 | offset_show(mdk_rdev_t *rdev, char *page) | |
2251 | { | |
6961ece4 | 2252 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2253 | } |
2254 | ||
2255 | static ssize_t | |
2256 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2257 | { | |
2258 | char *e; | |
2259 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2260 | if (e==buf || (*e && *e != '\n')) | |
2261 | return -EINVAL; | |
8ed0a521 | 2262 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2263 | return -EBUSY; |
dd8ac336 | 2264 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2265 | /* Must set offset before size, so overlap checks |
2266 | * can be sane */ | |
2267 | return -EBUSY; | |
93c8cad0 N |
2268 | rdev->data_offset = offset; |
2269 | return len; | |
2270 | } | |
2271 | ||
2272 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2273 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2274 | |
83303b61 N |
2275 | static ssize_t |
2276 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2277 | { | |
dd8ac336 | 2278 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2279 | } |
2280 | ||
c5d79adb N |
2281 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2282 | { | |
2283 | /* check if two start/length pairs overlap */ | |
2284 | if (s1+l1 <= s2) | |
2285 | return 0; | |
2286 | if (s2+l2 <= s1) | |
2287 | return 0; | |
2288 | return 1; | |
2289 | } | |
2290 | ||
b522adcd DW |
2291 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2292 | { | |
2293 | unsigned long long blocks; | |
2294 | sector_t new; | |
2295 | ||
2296 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2297 | return -EINVAL; | |
2298 | ||
2299 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2300 | return -EINVAL; /* sector conversion overflow */ | |
2301 | ||
2302 | new = blocks * 2; | |
2303 | if (new != blocks * 2) | |
2304 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2305 | ||
2306 | *sectors = new; | |
2307 | return 0; | |
2308 | } | |
2309 | ||
83303b61 N |
2310 | static ssize_t |
2311 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2312 | { | |
27c529bb | 2313 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2314 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2315 | sector_t sectors; |
27c529bb | 2316 | |
b522adcd | 2317 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2318 | return -EINVAL; |
0cd17fec | 2319 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2320 | if (my_mddev->persistent) { |
dd8ac336 AN |
2321 | sectors = super_types[my_mddev->major_version]. |
2322 | rdev_size_change(rdev, sectors); | |
2323 | if (!sectors) | |
0cd17fec | 2324 | return -EBUSY; |
dd8ac336 AN |
2325 | } else if (!sectors) |
2326 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2327 | rdev->data_offset; | |
0cd17fec | 2328 | } |
dd8ac336 | 2329 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2330 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2331 | |
dd8ac336 AN |
2332 | rdev->sectors = sectors; |
2333 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2334 | /* need to check that all other rdevs with the same ->bdev |
2335 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2336 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2337 | * we have to change it back, we will have the lock again. |
2338 | */ | |
2339 | mddev_t *mddev; | |
2340 | int overlap = 0; | |
159ec1fc | 2341 | struct list_head *tmp; |
c5d79adb | 2342 | |
27c529bb | 2343 | mddev_unlock(my_mddev); |
29ac4aa3 | 2344 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2345 | mdk_rdev_t *rdev2; |
2346 | ||
2347 | mddev_lock(mddev); | |
159ec1fc | 2348 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2349 | if (test_bit(AllReserved, &rdev2->flags) || |
2350 | (rdev->bdev == rdev2->bdev && | |
2351 | rdev != rdev2 && | |
dd8ac336 | 2352 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2353 | rdev2->data_offset, |
dd8ac336 | 2354 | rdev2->sectors))) { |
c5d79adb N |
2355 | overlap = 1; |
2356 | break; | |
2357 | } | |
2358 | mddev_unlock(mddev); | |
2359 | if (overlap) { | |
2360 | mddev_put(mddev); | |
2361 | break; | |
2362 | } | |
2363 | } | |
27c529bb | 2364 | mddev_lock(my_mddev); |
c5d79adb N |
2365 | if (overlap) { |
2366 | /* Someone else could have slipped in a size | |
2367 | * change here, but doing so is just silly. | |
dd8ac336 | 2368 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2369 | * safe, and trust userspace not to race with |
2370 | * itself | |
2371 | */ | |
dd8ac336 | 2372 | rdev->sectors = oldsectors; |
c5d79adb N |
2373 | return -EBUSY; |
2374 | } | |
2375 | } | |
83303b61 N |
2376 | return len; |
2377 | } | |
2378 | ||
2379 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2380 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2381 | |
86e6ffdd N |
2382 | static struct attribute *rdev_default_attrs[] = { |
2383 | &rdev_state.attr, | |
4dbcdc75 | 2384 | &rdev_errors.attr, |
014236d2 | 2385 | &rdev_slot.attr, |
93c8cad0 | 2386 | &rdev_offset.attr, |
83303b61 | 2387 | &rdev_size.attr, |
86e6ffdd N |
2388 | NULL, |
2389 | }; | |
2390 | static ssize_t | |
2391 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2392 | { | |
2393 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2394 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2395 | mddev_t *mddev = rdev->mddev; |
2396 | ssize_t rv; | |
86e6ffdd N |
2397 | |
2398 | if (!entry->show) | |
2399 | return -EIO; | |
27c529bb N |
2400 | |
2401 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2402 | if (!rv) { | |
2403 | if (rdev->mddev == NULL) | |
2404 | rv = -EBUSY; | |
2405 | else | |
2406 | rv = entry->show(rdev, page); | |
2407 | mddev_unlock(mddev); | |
2408 | } | |
2409 | return rv; | |
86e6ffdd N |
2410 | } |
2411 | ||
2412 | static ssize_t | |
2413 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2414 | const char *page, size_t length) | |
2415 | { | |
2416 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2417 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2418 | ssize_t rv; |
2419 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2420 | |
2421 | if (!entry->store) | |
2422 | return -EIO; | |
67463acb N |
2423 | if (!capable(CAP_SYS_ADMIN)) |
2424 | return -EACCES; | |
27c529bb | 2425 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2426 | if (!rv) { |
27c529bb N |
2427 | if (rdev->mddev == NULL) |
2428 | rv = -EBUSY; | |
2429 | else | |
2430 | rv = entry->store(rdev, page, length); | |
6a51830e | 2431 | mddev_unlock(mddev); |
ca388059 N |
2432 | } |
2433 | return rv; | |
86e6ffdd N |
2434 | } |
2435 | ||
2436 | static void rdev_free(struct kobject *ko) | |
2437 | { | |
2438 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2439 | kfree(rdev); | |
2440 | } | |
2441 | static struct sysfs_ops rdev_sysfs_ops = { | |
2442 | .show = rdev_attr_show, | |
2443 | .store = rdev_attr_store, | |
2444 | }; | |
2445 | static struct kobj_type rdev_ktype = { | |
2446 | .release = rdev_free, | |
2447 | .sysfs_ops = &rdev_sysfs_ops, | |
2448 | .default_attrs = rdev_default_attrs, | |
2449 | }; | |
2450 | ||
1da177e4 LT |
2451 | /* |
2452 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2453 | * | |
2454 | * mark the device faulty if: | |
2455 | * | |
2456 | * - the device is nonexistent (zero size) | |
2457 | * - the device has no valid superblock | |
2458 | * | |
2459 | * a faulty rdev _never_ has rdev->sb set. | |
2460 | */ | |
2461 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2462 | { | |
2463 | char b[BDEVNAME_SIZE]; | |
2464 | int err; | |
2465 | mdk_rdev_t *rdev; | |
2466 | sector_t size; | |
2467 | ||
9ffae0cf | 2468 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2469 | if (!rdev) { |
2470 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2471 | return ERR_PTR(-ENOMEM); | |
2472 | } | |
1da177e4 LT |
2473 | |
2474 | if ((err = alloc_disk_sb(rdev))) | |
2475 | goto abort_free; | |
2476 | ||
c5d79adb | 2477 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2478 | if (err) |
2479 | goto abort_free; | |
2480 | ||
f9cb074b | 2481 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2482 | |
1da177e4 | 2483 | rdev->desc_nr = -1; |
2b6e8459 | 2484 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2485 | rdev->raid_disk = -1; |
b2d444d7 | 2486 | rdev->flags = 0; |
1da177e4 | 2487 | rdev->data_offset = 0; |
42543769 | 2488 | rdev->sb_events = 0; |
1da177e4 | 2489 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2490 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2491 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2492 | |
2493 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2494 | if (!size) { | |
2495 | printk(KERN_WARNING | |
2496 | "md: %s has zero or unknown size, marking faulty!\n", | |
2497 | bdevname(rdev->bdev,b)); | |
2498 | err = -EINVAL; | |
2499 | goto abort_free; | |
2500 | } | |
2501 | ||
2502 | if (super_format >= 0) { | |
2503 | err = super_types[super_format]. | |
2504 | load_super(rdev, NULL, super_minor); | |
2505 | if (err == -EINVAL) { | |
df968c4e N |
2506 | printk(KERN_WARNING |
2507 | "md: %s does not have a valid v%d.%d " | |
2508 | "superblock, not importing!\n", | |
2509 | bdevname(rdev->bdev,b), | |
2510 | super_format, super_minor); | |
1da177e4 LT |
2511 | goto abort_free; |
2512 | } | |
2513 | if (err < 0) { | |
2514 | printk(KERN_WARNING | |
2515 | "md: could not read %s's sb, not importing!\n", | |
2516 | bdevname(rdev->bdev,b)); | |
2517 | goto abort_free; | |
2518 | } | |
2519 | } | |
6bfe0b49 | 2520 | |
1da177e4 | 2521 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2522 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2523 | |
2524 | return rdev; | |
2525 | ||
2526 | abort_free: | |
2527 | if (rdev->sb_page) { | |
2528 | if (rdev->bdev) | |
2529 | unlock_rdev(rdev); | |
2530 | free_disk_sb(rdev); | |
2531 | } | |
2532 | kfree(rdev); | |
2533 | return ERR_PTR(err); | |
2534 | } | |
2535 | ||
2536 | /* | |
2537 | * Check a full RAID array for plausibility | |
2538 | */ | |
2539 | ||
2540 | ||
a757e64c | 2541 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2542 | { |
2543 | int i; | |
159ec1fc | 2544 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2545 | char b[BDEVNAME_SIZE]; |
2546 | ||
2547 | freshest = NULL; | |
d089c6af | 2548 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2549 | switch (super_types[mddev->major_version]. |
2550 | load_super(rdev, freshest, mddev->minor_version)) { | |
2551 | case 1: | |
2552 | freshest = rdev; | |
2553 | break; | |
2554 | case 0: | |
2555 | break; | |
2556 | default: | |
2557 | printk( KERN_ERR \ | |
2558 | "md: fatal superblock inconsistency in %s" | |
2559 | " -- removing from array\n", | |
2560 | bdevname(rdev->bdev,b)); | |
2561 | kick_rdev_from_array(rdev); | |
2562 | } | |
2563 | ||
2564 | ||
2565 | super_types[mddev->major_version]. | |
2566 | validate_super(mddev, freshest); | |
2567 | ||
2568 | i = 0; | |
d089c6af | 2569 | rdev_for_each(rdev, tmp, mddev) { |
de01dfad N |
2570 | if (rdev->desc_nr >= mddev->max_disks || |
2571 | i > mddev->max_disks) { | |
2572 | printk(KERN_WARNING | |
2573 | "md: %s: %s: only %d devices permitted\n", | |
2574 | mdname(mddev), bdevname(rdev->bdev, b), | |
2575 | mddev->max_disks); | |
2576 | kick_rdev_from_array(rdev); | |
2577 | continue; | |
2578 | } | |
1da177e4 LT |
2579 | if (rdev != freshest) |
2580 | if (super_types[mddev->major_version]. | |
2581 | validate_super(mddev, rdev)) { | |
2582 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2583 | " from array!\n", | |
2584 | bdevname(rdev->bdev,b)); | |
2585 | kick_rdev_from_array(rdev); | |
2586 | continue; | |
2587 | } | |
2588 | if (mddev->level == LEVEL_MULTIPATH) { | |
2589 | rdev->desc_nr = i++; | |
2590 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2591 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2592 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2593 | rdev->raid_disk = -1; | |
2594 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2595 | } |
2596 | } | |
2597 | ||
2598 | ||
2599 | ||
2600 | if (mddev->recovery_cp != MaxSector && | |
2601 | mddev->level >= 1) | |
2602 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2603 | " -- starting background reconstruction\n", | |
2604 | mdname(mddev)); | |
2605 | ||
1da177e4 LT |
2606 | } |
2607 | ||
19052c0e N |
2608 | static void md_safemode_timeout(unsigned long data); |
2609 | ||
16f17b39 N |
2610 | static ssize_t |
2611 | safe_delay_show(mddev_t *mddev, char *page) | |
2612 | { | |
2613 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2614 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2615 | } | |
2616 | static ssize_t | |
2617 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2618 | { | |
2619 | int scale=1; | |
2620 | int dot=0; | |
2621 | int i; | |
2622 | unsigned long msec; | |
2623 | char buf[30]; | |
97ce0a7f | 2624 | |
16f17b39 N |
2625 | /* remove a period, and count digits after it */ |
2626 | if (len >= sizeof(buf)) | |
2627 | return -EINVAL; | |
97ce0a7f | 2628 | strlcpy(buf, cbuf, sizeof(buf)); |
16f17b39 N |
2629 | for (i=0; i<len; i++) { |
2630 | if (dot) { | |
2631 | if (isdigit(buf[i])) { | |
2632 | buf[i-1] = buf[i]; | |
2633 | scale *= 10; | |
2634 | } | |
2635 | buf[i] = 0; | |
2636 | } else if (buf[i] == '.') { | |
2637 | dot=1; | |
2638 | buf[i] = 0; | |
2639 | } | |
2640 | } | |
97ce0a7f | 2641 | if (strict_strtoul(buf, 10, &msec) < 0) |
16f17b39 N |
2642 | return -EINVAL; |
2643 | msec = (msec * 1000) / scale; | |
2644 | if (msec == 0) | |
2645 | mddev->safemode_delay = 0; | |
2646 | else { | |
19052c0e | 2647 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2648 | mddev->safemode_delay = (msec*HZ)/1000; |
2649 | if (mddev->safemode_delay == 0) | |
2650 | mddev->safemode_delay = 1; | |
19052c0e N |
2651 | if (mddev->safemode_delay < old_delay) |
2652 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2653 | } |
2654 | return len; | |
2655 | } | |
2656 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2657 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2658 | |
eae1701f | 2659 | static ssize_t |
96de1e66 | 2660 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2661 | { |
2604b703 | 2662 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2663 | if (p) |
eae1701f | 2664 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2665 | else if (mddev->clevel[0]) |
2666 | return sprintf(page, "%s\n", mddev->clevel); | |
2667 | else if (mddev->level != LEVEL_NONE) | |
2668 | return sprintf(page, "%d\n", mddev->level); | |
2669 | else | |
2670 | return 0; | |
eae1701f N |
2671 | } |
2672 | ||
d9d166c2 N |
2673 | static ssize_t |
2674 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2675 | { | |
245f46c2 | 2676 | char level[16]; |
20a49ff6 | 2677 | ssize_t rv = len; |
245f46c2 N |
2678 | struct mdk_personality *pers; |
2679 | void *priv; | |
2680 | ||
2681 | if (mddev->pers == NULL) { | |
2682 | if (len == 0) | |
2683 | return 0; | |
2684 | if (len >= sizeof(mddev->clevel)) | |
2685 | return -ENOSPC; | |
2686 | strncpy(mddev->clevel, buf, len); | |
2687 | if (mddev->clevel[len-1] == '\n') | |
2688 | len--; | |
2689 | mddev->clevel[len] = 0; | |
2690 | mddev->level = LEVEL_NONE; | |
2691 | return rv; | |
2692 | } | |
2693 | ||
2694 | /* request to change the personality. Need to ensure: | |
2695 | * - array is not engaged in resync/recovery/reshape | |
2696 | * - old personality can be suspended | |
2697 | * - new personality will access other array. | |
2698 | */ | |
2699 | ||
2700 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) | |
d9d166c2 | 2701 | return -EBUSY; |
245f46c2 N |
2702 | |
2703 | if (!mddev->pers->quiesce) { | |
2704 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
2705 | mdname(mddev), mddev->pers->name); | |
2706 | return -EINVAL; | |
2707 | } | |
2708 | ||
2709 | /* Now find the new personality */ | |
2710 | if (len == 0 || len >= sizeof(level)) | |
2711 | return -EINVAL; | |
2712 | strncpy(level, buf, len); | |
2713 | if (level[len-1] == '\n') | |
d9d166c2 | 2714 | len--; |
245f46c2 N |
2715 | level[len] = 0; |
2716 | ||
2717 | request_module("md-%s", level); | |
2718 | spin_lock(&pers_lock); | |
2719 | pers = find_pers(LEVEL_NONE, level); | |
2720 | if (!pers || !try_module_get(pers->owner)) { | |
2721 | spin_unlock(&pers_lock); | |
2722 | printk(KERN_WARNING "md: personality %s not loaded\n", level); | |
2723 | return -EINVAL; | |
2724 | } | |
2725 | spin_unlock(&pers_lock); | |
2726 | ||
2727 | if (pers == mddev->pers) { | |
2728 | /* Nothing to do! */ | |
2729 | module_put(pers->owner); | |
2730 | return rv; | |
2731 | } | |
2732 | if (!pers->takeover) { | |
2733 | module_put(pers->owner); | |
2734 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
2735 | mdname(mddev), level); | |
2736 | return -EINVAL; | |
2737 | } | |
2738 | ||
2739 | /* ->takeover must set new_* and/or delta_disks | |
2740 | * if it succeeds, and may set them when it fails. | |
2741 | */ | |
2742 | priv = pers->takeover(mddev); | |
2743 | if (IS_ERR(priv)) { | |
2744 | mddev->new_level = mddev->level; | |
2745 | mddev->new_layout = mddev->layout; | |
2746 | mddev->new_chunk = mddev->chunk_size; | |
2747 | mddev->raid_disks -= mddev->delta_disks; | |
2748 | mddev->delta_disks = 0; | |
2749 | module_put(pers->owner); | |
2750 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
2751 | mdname(mddev), level); | |
2752 | return PTR_ERR(priv); | |
2753 | } | |
2754 | ||
2755 | /* Looks like we have a winner */ | |
2756 | mddev_suspend(mddev); | |
2757 | mddev->pers->stop(mddev); | |
2758 | module_put(mddev->pers->owner); | |
2759 | mddev->pers = pers; | |
2760 | mddev->private = priv; | |
2761 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
2762 | mddev->level = mddev->new_level; | |
2763 | mddev->layout = mddev->new_layout; | |
2764 | mddev->chunk_size = mddev->new_chunk; | |
2765 | mddev->delta_disks = 0; | |
2766 | pers->run(mddev); | |
2767 | mddev_resume(mddev); | |
2768 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2769 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2770 | md_wakeup_thread(mddev->thread); | |
d9d166c2 N |
2771 | return rv; |
2772 | } | |
2773 | ||
2774 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2775 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2776 | |
d4dbd025 N |
2777 | |
2778 | static ssize_t | |
2779 | layout_show(mddev_t *mddev, char *page) | |
2780 | { | |
2781 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2782 | if (mddev->reshape_position != MaxSector && |
2783 | mddev->layout != mddev->new_layout) | |
2784 | return sprintf(page, "%d (%d)\n", | |
2785 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2786 | return sprintf(page, "%d\n", mddev->layout); |
2787 | } | |
2788 | ||
2789 | static ssize_t | |
2790 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2791 | { | |
2792 | char *e; | |
2793 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2794 | |
2795 | if (!*buf || (*e && *e != '\n')) | |
2796 | return -EINVAL; | |
2797 | ||
b3546035 N |
2798 | if (mddev->pers) { |
2799 | int err; | |
2800 | if (mddev->pers->reconfig == NULL) | |
2801 | return -EBUSY; | |
2802 | err = mddev->pers->reconfig(mddev, n, -1); | |
2803 | if (err) | |
2804 | return err; | |
2805 | } else { | |
08a02ecd | 2806 | mddev->new_layout = n; |
b3546035 N |
2807 | if (mddev->reshape_position == MaxSector) |
2808 | mddev->layout = n; | |
2809 | } | |
d4dbd025 N |
2810 | return len; |
2811 | } | |
2812 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2813 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2814 | |
2815 | ||
eae1701f | 2816 | static ssize_t |
96de1e66 | 2817 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2818 | { |
bb636547 N |
2819 | if (mddev->raid_disks == 0) |
2820 | return 0; | |
08a02ecd N |
2821 | if (mddev->reshape_position != MaxSector && |
2822 | mddev->delta_disks != 0) | |
2823 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2824 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2825 | return sprintf(page, "%d\n", mddev->raid_disks); |
2826 | } | |
2827 | ||
da943b99 N |
2828 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2829 | ||
2830 | static ssize_t | |
2831 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2832 | { | |
da943b99 N |
2833 | char *e; |
2834 | int rv = 0; | |
2835 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2836 | ||
2837 | if (!*buf || (*e && *e != '\n')) | |
2838 | return -EINVAL; | |
2839 | ||
2840 | if (mddev->pers) | |
2841 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2842 | else if (mddev->reshape_position != MaxSector) { |
2843 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2844 | mddev->delta_disks = n - olddisks; | |
2845 | mddev->raid_disks = n; | |
2846 | } else | |
da943b99 N |
2847 | mddev->raid_disks = n; |
2848 | return rv ? rv : len; | |
2849 | } | |
2850 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2851 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2852 | |
3b34380a N |
2853 | static ssize_t |
2854 | chunk_size_show(mddev_t *mddev, char *page) | |
2855 | { | |
08a02ecd N |
2856 | if (mddev->reshape_position != MaxSector && |
2857 | mddev->chunk_size != mddev->new_chunk) | |
2858 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2859 | mddev->chunk_size); | |
3b34380a N |
2860 | return sprintf(page, "%d\n", mddev->chunk_size); |
2861 | } | |
2862 | ||
2863 | static ssize_t | |
2864 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2865 | { | |
3b34380a N |
2866 | char *e; |
2867 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2868 | ||
3b34380a N |
2869 | if (!*buf || (*e && *e != '\n')) |
2870 | return -EINVAL; | |
2871 | ||
b3546035 N |
2872 | if (mddev->pers) { |
2873 | int err; | |
2874 | if (mddev->pers->reconfig == NULL) | |
2875 | return -EBUSY; | |
2876 | err = mddev->pers->reconfig(mddev, -1, n); | |
2877 | if (err) | |
2878 | return err; | |
2879 | } else { | |
08a02ecd | 2880 | mddev->new_chunk = n; |
b3546035 N |
2881 | if (mddev->reshape_position == MaxSector) |
2882 | mddev->chunk_size = n; | |
2883 | } | |
3b34380a N |
2884 | return len; |
2885 | } | |
2886 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2887 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2888 | |
a94213b1 N |
2889 | static ssize_t |
2890 | resync_start_show(mddev_t *mddev, char *page) | |
2891 | { | |
d1a7c503 N |
2892 | if (mddev->recovery_cp == MaxSector) |
2893 | return sprintf(page, "none\n"); | |
a94213b1 N |
2894 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
2895 | } | |
2896 | ||
2897 | static ssize_t | |
2898 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2899 | { | |
a94213b1 N |
2900 | char *e; |
2901 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2902 | ||
2903 | if (mddev->pers) | |
2904 | return -EBUSY; | |
2905 | if (!*buf || (*e && *e != '\n')) | |
2906 | return -EINVAL; | |
2907 | ||
2908 | mddev->recovery_cp = n; | |
2909 | return len; | |
2910 | } | |
2911 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2912 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2913 | |
9e653b63 N |
2914 | /* |
2915 | * The array state can be: | |
2916 | * | |
2917 | * clear | |
2918 | * No devices, no size, no level | |
2919 | * Equivalent to STOP_ARRAY ioctl | |
2920 | * inactive | |
2921 | * May have some settings, but array is not active | |
2922 | * all IO results in error | |
2923 | * When written, doesn't tear down array, but just stops it | |
2924 | * suspended (not supported yet) | |
2925 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2926 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2927 | * readonly |
2928 | * no resync can happen. no superblocks get written. | |
2929 | * write requests fail | |
2930 | * read-auto | |
2931 | * like readonly, but behaves like 'clean' on a write request. | |
2932 | * | |
2933 | * clean - no pending writes, but otherwise active. | |
2934 | * When written to inactive array, starts without resync | |
2935 | * If a write request arrives then | |
2936 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2937 | * if not known, block and switch to write-pending | |
2938 | * If written to an active array that has pending writes, then fails. | |
2939 | * active | |
2940 | * fully active: IO and resync can be happening. | |
2941 | * When written to inactive array, starts with resync | |
2942 | * | |
2943 | * write-pending | |
2944 | * clean, but writes are blocked waiting for 'active' to be written. | |
2945 | * | |
2946 | * active-idle | |
2947 | * like active, but no writes have been seen for a while (100msec). | |
2948 | * | |
2949 | */ | |
2950 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2951 | write_pending, active_idle, bad_word}; | |
05381954 | 2952 | static char *array_states[] = { |
9e653b63 N |
2953 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2954 | "write-pending", "active-idle", NULL }; | |
2955 | ||
2956 | static int match_word(const char *word, char **list) | |
2957 | { | |
2958 | int n; | |
2959 | for (n=0; list[n]; n++) | |
2960 | if (cmd_match(word, list[n])) | |
2961 | break; | |
2962 | return n; | |
2963 | } | |
2964 | ||
2965 | static ssize_t | |
2966 | array_state_show(mddev_t *mddev, char *page) | |
2967 | { | |
2968 | enum array_state st = inactive; | |
2969 | ||
2970 | if (mddev->pers) | |
2971 | switch(mddev->ro) { | |
2972 | case 1: | |
2973 | st = readonly; | |
2974 | break; | |
2975 | case 2: | |
2976 | st = read_auto; | |
2977 | break; | |
2978 | case 0: | |
2979 | if (mddev->in_sync) | |
2980 | st = clean; | |
e691063a N |
2981 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2982 | st = write_pending; | |
9e653b63 N |
2983 | else if (mddev->safemode) |
2984 | st = active_idle; | |
2985 | else | |
2986 | st = active; | |
2987 | } | |
2988 | else { | |
2989 | if (list_empty(&mddev->disks) && | |
2990 | mddev->raid_disks == 0 && | |
58c0fed4 | 2991 | mddev->dev_sectors == 0) |
9e653b63 N |
2992 | st = clear; |
2993 | else | |
2994 | st = inactive; | |
2995 | } | |
2996 | return sprintf(page, "%s\n", array_states[st]); | |
2997 | } | |
2998 | ||
df5b20cf | 2999 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
3000 | static int do_md_run(mddev_t * mddev); |
3001 | static int restart_array(mddev_t *mddev); | |
3002 | ||
3003 | static ssize_t | |
3004 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3005 | { | |
3006 | int err = -EINVAL; | |
3007 | enum array_state st = match_word(buf, array_states); | |
3008 | switch(st) { | |
3009 | case bad_word: | |
3010 | break; | |
3011 | case clear: | |
3012 | /* stopping an active array */ | |
f2ea68cf | 3013 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3014 | return -EBUSY; |
df5b20cf | 3015 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3016 | break; |
3017 | case inactive: | |
3018 | /* stopping an active array */ | |
3019 | if (mddev->pers) { | |
f2ea68cf | 3020 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3021 | return -EBUSY; |
df5b20cf | 3022 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3023 | } else |
3024 | err = 0; /* already inactive */ | |
9e653b63 N |
3025 | break; |
3026 | case suspended: | |
3027 | break; /* not supported yet */ | |
3028 | case readonly: | |
3029 | if (mddev->pers) | |
df5b20cf | 3030 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
3031 | else { |
3032 | mddev->ro = 1; | |
648b629e | 3033 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3034 | err = do_md_run(mddev); |
3035 | } | |
3036 | break; | |
3037 | case read_auto: | |
9e653b63 | 3038 | if (mddev->pers) { |
80268ee9 | 3039 | if (mddev->ro == 0) |
df5b20cf | 3040 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 3041 | else if (mddev->ro == 1) |
648b629e N |
3042 | err = restart_array(mddev); |
3043 | if (err == 0) { | |
3044 | mddev->ro = 2; | |
3045 | set_disk_ro(mddev->gendisk, 0); | |
3046 | } | |
9e653b63 N |
3047 | } else { |
3048 | mddev->ro = 2; | |
3049 | err = do_md_run(mddev); | |
3050 | } | |
3051 | break; | |
3052 | case clean: | |
3053 | if (mddev->pers) { | |
3054 | restart_array(mddev); | |
3055 | spin_lock_irq(&mddev->write_lock); | |
3056 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3057 | if (mddev->in_sync == 0) { |
3058 | mddev->in_sync = 1; | |
31a59e34 N |
3059 | if (mddev->safemode == 1) |
3060 | mddev->safemode = 0; | |
e691063a N |
3061 | if (mddev->persistent) |
3062 | set_bit(MD_CHANGE_CLEAN, | |
3063 | &mddev->flags); | |
3064 | } | |
3065 | err = 0; | |
3066 | } else | |
3067 | err = -EBUSY; | |
9e653b63 | 3068 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3069 | } else |
3070 | err = -EINVAL; | |
9e653b63 N |
3071 | break; |
3072 | case active: | |
3073 | if (mddev->pers) { | |
3074 | restart_array(mddev); | |
e691063a N |
3075 | if (mddev->external) |
3076 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
3077 | wake_up(&mddev->sb_wait); |
3078 | err = 0; | |
3079 | } else { | |
3080 | mddev->ro = 0; | |
648b629e | 3081 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3082 | err = do_md_run(mddev); |
3083 | } | |
3084 | break; | |
3085 | case write_pending: | |
3086 | case active_idle: | |
3087 | /* these cannot be set */ | |
3088 | break; | |
3089 | } | |
3090 | if (err) | |
3091 | return err; | |
0fd62b86 | 3092 | else { |
b62b7590 | 3093 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 3094 | return len; |
0fd62b86 | 3095 | } |
9e653b63 | 3096 | } |
80ca3a44 N |
3097 | static struct md_sysfs_entry md_array_state = |
3098 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3099 | |
6d7ff738 N |
3100 | static ssize_t |
3101 | null_show(mddev_t *mddev, char *page) | |
3102 | { | |
3103 | return -EINVAL; | |
3104 | } | |
3105 | ||
3106 | static ssize_t | |
3107 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3108 | { | |
3109 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3110 | /* The new device is added to the array. | |
3111 | * If the array has a persistent superblock, we read the | |
3112 | * superblock to initialise info and check validity. | |
3113 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3114 | * which mainly checks size. | |
3115 | */ | |
3116 | char *e; | |
3117 | int major = simple_strtoul(buf, &e, 10); | |
3118 | int minor; | |
3119 | dev_t dev; | |
3120 | mdk_rdev_t *rdev; | |
3121 | int err; | |
3122 | ||
3123 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3124 | return -EINVAL; | |
3125 | minor = simple_strtoul(e+1, &e, 10); | |
3126 | if (*e && *e != '\n') | |
3127 | return -EINVAL; | |
3128 | dev = MKDEV(major, minor); | |
3129 | if (major != MAJOR(dev) || | |
3130 | minor != MINOR(dev)) | |
3131 | return -EOVERFLOW; | |
3132 | ||
3133 | ||
3134 | if (mddev->persistent) { | |
3135 | rdev = md_import_device(dev, mddev->major_version, | |
3136 | mddev->minor_version); | |
3137 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3138 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3139 | mdk_rdev_t, same_set); | |
3140 | err = super_types[mddev->major_version] | |
3141 | .load_super(rdev, rdev0, mddev->minor_version); | |
3142 | if (err < 0) | |
3143 | goto out; | |
3144 | } | |
c5d79adb N |
3145 | } else if (mddev->external) |
3146 | rdev = md_import_device(dev, -2, -1); | |
3147 | else | |
6d7ff738 N |
3148 | rdev = md_import_device(dev, -1, -1); |
3149 | ||
3150 | if (IS_ERR(rdev)) | |
3151 | return PTR_ERR(rdev); | |
3152 | err = bind_rdev_to_array(rdev, mddev); | |
3153 | out: | |
3154 | if (err) | |
3155 | export_rdev(rdev); | |
3156 | return err ? err : len; | |
3157 | } | |
3158 | ||
3159 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3160 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3161 | |
9b1d1dac PC |
3162 | static ssize_t |
3163 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3164 | { | |
3165 | char *end; | |
3166 | unsigned long chunk, end_chunk; | |
3167 | ||
3168 | if (!mddev->bitmap) | |
3169 | goto out; | |
3170 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3171 | while (*buf) { | |
3172 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3173 | if (buf == end) break; | |
3174 | if (*end == '-') { /* range */ | |
3175 | buf = end + 1; | |
3176 | end_chunk = simple_strtoul(buf, &end, 0); | |
3177 | if (buf == end) break; | |
3178 | } | |
3179 | if (*end && !isspace(*end)) break; | |
3180 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
3181 | buf = end; | |
3182 | while (isspace(*buf)) buf++; | |
3183 | } | |
3184 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3185 | out: | |
3186 | return len; | |
3187 | } | |
3188 | ||
3189 | static struct md_sysfs_entry md_bitmap = | |
3190 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3191 | ||
a35b0d69 N |
3192 | static ssize_t |
3193 | size_show(mddev_t *mddev, char *page) | |
3194 | { | |
58c0fed4 AN |
3195 | return sprintf(page, "%llu\n", |
3196 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3197 | } |
3198 | ||
d71f9f88 | 3199 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3200 | |
3201 | static ssize_t | |
3202 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3203 | { | |
3204 | /* If array is inactive, we can reduce the component size, but | |
3205 | * not increase it (except from 0). | |
3206 | * If array is active, we can try an on-line resize | |
3207 | */ | |
b522adcd DW |
3208 | sector_t sectors; |
3209 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3210 | |
58c0fed4 AN |
3211 | if (err < 0) |
3212 | return err; | |
a35b0d69 | 3213 | if (mddev->pers) { |
58c0fed4 | 3214 | err = update_size(mddev, sectors); |
850b2b42 | 3215 | md_update_sb(mddev, 1); |
a35b0d69 | 3216 | } else { |
58c0fed4 AN |
3217 | if (mddev->dev_sectors == 0 || |
3218 | mddev->dev_sectors > sectors) | |
3219 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3220 | else |
3221 | err = -ENOSPC; | |
3222 | } | |
3223 | return err ? err : len; | |
3224 | } | |
3225 | ||
3226 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3227 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3228 | |
8bb93aac N |
3229 | |
3230 | /* Metdata version. | |
e691063a N |
3231 | * This is one of |
3232 | * 'none' for arrays with no metadata (good luck...) | |
3233 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3234 | * or N.M for internally known formats |
3235 | */ | |
3236 | static ssize_t | |
3237 | metadata_show(mddev_t *mddev, char *page) | |
3238 | { | |
3239 | if (mddev->persistent) | |
3240 | return sprintf(page, "%d.%d\n", | |
3241 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3242 | else if (mddev->external) |
3243 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3244 | else |
3245 | return sprintf(page, "none\n"); | |
3246 | } | |
3247 | ||
3248 | static ssize_t | |
3249 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3250 | { | |
3251 | int major, minor; | |
3252 | char *e; | |
ea43ddd8 N |
3253 | /* Changing the details of 'external' metadata is |
3254 | * always permitted. Otherwise there must be | |
3255 | * no devices attached to the array. | |
3256 | */ | |
3257 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3258 | ; | |
3259 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3260 | return -EBUSY; |
3261 | ||
3262 | if (cmd_match(buf, "none")) { | |
3263 | mddev->persistent = 0; | |
e691063a N |
3264 | mddev->external = 0; |
3265 | mddev->major_version = 0; | |
3266 | mddev->minor_version = 90; | |
3267 | return len; | |
3268 | } | |
3269 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3270 | size_t namelen = len-9; |
e691063a N |
3271 | if (namelen >= sizeof(mddev->metadata_type)) |
3272 | namelen = sizeof(mddev->metadata_type)-1; | |
3273 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3274 | mddev->metadata_type[namelen] = 0; | |
3275 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3276 | mddev->metadata_type[--namelen] = 0; | |
3277 | mddev->persistent = 0; | |
3278 | mddev->external = 1; | |
8bb93aac N |
3279 | mddev->major_version = 0; |
3280 | mddev->minor_version = 90; | |
3281 | return len; | |
3282 | } | |
3283 | major = simple_strtoul(buf, &e, 10); | |
3284 | if (e==buf || *e != '.') | |
3285 | return -EINVAL; | |
3286 | buf = e+1; | |
3287 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3288 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3289 | return -EINVAL; |
50511da3 | 3290 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3291 | return -ENOENT; |
3292 | mddev->major_version = major; | |
3293 | mddev->minor_version = minor; | |
3294 | mddev->persistent = 1; | |
e691063a | 3295 | mddev->external = 0; |
8bb93aac N |
3296 | return len; |
3297 | } | |
3298 | ||
3299 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3300 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3301 | |
24dd469d | 3302 | static ssize_t |
7eec314d | 3303 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3304 | { |
7eec314d | 3305 | char *type = "idle"; |
31399d9e | 3306 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2b12ab6d | 3307 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3308 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3309 | type = "reshape"; | |
3310 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3311 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3312 | type = "resync"; | |
3313 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3314 | type = "check"; | |
3315 | else | |
3316 | type = "repair"; | |
72a23c21 | 3317 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3318 | type = "recover"; |
3319 | } | |
3320 | return sprintf(page, "%s\n", type); | |
3321 | } | |
3322 | ||
3323 | static ssize_t | |
7eec314d | 3324 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3325 | { |
7eec314d N |
3326 | if (!mddev->pers || !mddev->pers->sync_request) |
3327 | return -EINVAL; | |
3328 | ||
bce74dac | 3329 | if (cmd_match(page, "idle")) { |
7eec314d N |
3330 | if (mddev->sync_thread) { |
3331 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3332 | md_unregister_thread(mddev->sync_thread); | |
3333 | mddev->sync_thread = NULL; | |
3334 | mddev->recovery = 0; | |
3335 | } | |
03c902e1 N |
3336 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3337 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3338 | return -EBUSY; |
72a23c21 NB |
3339 | else if (cmd_match(page, "resync")) |
3340 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3341 | else if (cmd_match(page, "recover")) { | |
3342 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3343 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3344 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3345 | int err; |
3346 | if (mddev->pers->start_reshape == NULL) | |
3347 | return -EINVAL; | |
3348 | err = mddev->pers->start_reshape(mddev); | |
3349 | if (err) | |
3350 | return err; | |
a99ac971 | 3351 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3352 | } else { |
bce74dac | 3353 | if (cmd_match(page, "check")) |
7eec314d | 3354 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3355 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3356 | return -EINVAL; |
3357 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3358 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3359 | } |
03c902e1 | 3360 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3361 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3362 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3363 | return len; |
3364 | } | |
3365 | ||
9d88883e | 3366 | static ssize_t |
96de1e66 | 3367 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3368 | { |
3369 | return sprintf(page, "%llu\n", | |
3370 | (unsigned long long) mddev->resync_mismatches); | |
3371 | } | |
3372 | ||
80ca3a44 N |
3373 | static struct md_sysfs_entry md_scan_mode = |
3374 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3375 | |
96de1e66 | 3376 | |
80ca3a44 | 3377 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3378 | |
88202a0c N |
3379 | static ssize_t |
3380 | sync_min_show(mddev_t *mddev, char *page) | |
3381 | { | |
3382 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3383 | mddev->sync_speed_min ? "local": "system"); | |
3384 | } | |
3385 | ||
3386 | static ssize_t | |
3387 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3388 | { | |
3389 | int min; | |
3390 | char *e; | |
3391 | if (strncmp(buf, "system", 6)==0) { | |
3392 | mddev->sync_speed_min = 0; | |
3393 | return len; | |
3394 | } | |
3395 | min = simple_strtoul(buf, &e, 10); | |
3396 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3397 | return -EINVAL; | |
3398 | mddev->sync_speed_min = min; | |
3399 | return len; | |
3400 | } | |
3401 | ||
3402 | static struct md_sysfs_entry md_sync_min = | |
3403 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3404 | ||
3405 | static ssize_t | |
3406 | sync_max_show(mddev_t *mddev, char *page) | |
3407 | { | |
3408 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3409 | mddev->sync_speed_max ? "local": "system"); | |
3410 | } | |
3411 | ||
3412 | static ssize_t | |
3413 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3414 | { | |
3415 | int max; | |
3416 | char *e; | |
3417 | if (strncmp(buf, "system", 6)==0) { | |
3418 | mddev->sync_speed_max = 0; | |
3419 | return len; | |
3420 | } | |
3421 | max = simple_strtoul(buf, &e, 10); | |
3422 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3423 | return -EINVAL; | |
3424 | mddev->sync_speed_max = max; | |
3425 | return len; | |
3426 | } | |
3427 | ||
3428 | static struct md_sysfs_entry md_sync_max = | |
3429 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3430 | ||
d7f3d291 IP |
3431 | static ssize_t |
3432 | degraded_show(mddev_t *mddev, char *page) | |
3433 | { | |
3434 | return sprintf(page, "%d\n", mddev->degraded); | |
3435 | } | |
3436 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3437 | |
90b08710 BS |
3438 | static ssize_t |
3439 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3440 | { | |
3441 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3442 | } | |
3443 | ||
3444 | static ssize_t | |
3445 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3446 | { | |
3447 | long n; | |
3448 | ||
3449 | if (strict_strtol(buf, 10, &n)) | |
3450 | return -EINVAL; | |
3451 | ||
3452 | if (n != 0 && n != 1) | |
3453 | return -EINVAL; | |
3454 | ||
3455 | mddev->parallel_resync = n; | |
3456 | ||
3457 | if (mddev->sync_thread) | |
3458 | wake_up(&resync_wait); | |
3459 | ||
3460 | return len; | |
3461 | } | |
3462 | ||
3463 | /* force parallel resync, even with shared block devices */ | |
3464 | static struct md_sysfs_entry md_sync_force_parallel = | |
3465 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3466 | sync_force_parallel_show, sync_force_parallel_store); | |
3467 | ||
88202a0c N |
3468 | static ssize_t |
3469 | sync_speed_show(mddev_t *mddev, char *page) | |
3470 | { | |
3471 | unsigned long resync, dt, db; | |
d1a7c503 N |
3472 | if (mddev->curr_resync == 0) |
3473 | return sprintf(page, "none\n"); | |
9687a60c AN |
3474 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3475 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3476 | if (!dt) dt++; |
9687a60c AN |
3477 | db = resync - mddev->resync_mark_cnt; |
3478 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3479 | } |
3480 | ||
80ca3a44 | 3481 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3482 | |
3483 | static ssize_t | |
3484 | sync_completed_show(mddev_t *mddev, char *page) | |
3485 | { | |
58c0fed4 | 3486 | unsigned long max_sectors, resync; |
88202a0c | 3487 | |
acb180b0 N |
3488 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3489 | return sprintf(page, "none\n"); | |
3490 | ||
88202a0c | 3491 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3492 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3493 | else |
58c0fed4 | 3494 | max_sectors = mddev->dev_sectors; |
88202a0c | 3495 | |
acb180b0 | 3496 | resync = mddev->curr_resync_completed; |
58c0fed4 | 3497 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3498 | } |
3499 | ||
80ca3a44 | 3500 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3501 | |
5e96ee65 NB |
3502 | static ssize_t |
3503 | min_sync_show(mddev_t *mddev, char *page) | |
3504 | { | |
3505 | return sprintf(page, "%llu\n", | |
3506 | (unsigned long long)mddev->resync_min); | |
3507 | } | |
3508 | static ssize_t | |
3509 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3510 | { | |
3511 | unsigned long long min; | |
3512 | if (strict_strtoull(buf, 10, &min)) | |
3513 | return -EINVAL; | |
3514 | if (min > mddev->resync_max) | |
3515 | return -EINVAL; | |
3516 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3517 | return -EBUSY; | |
3518 | ||
3519 | /* Must be a multiple of chunk_size */ | |
3520 | if (mddev->chunk_size) { | |
3521 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3522 | return -EINVAL; | |
3523 | } | |
3524 | mddev->resync_min = min; | |
3525 | ||
3526 | return len; | |
3527 | } | |
3528 | ||
3529 | static struct md_sysfs_entry md_min_sync = | |
3530 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3531 | ||
c6207277 N |
3532 | static ssize_t |
3533 | max_sync_show(mddev_t *mddev, char *page) | |
3534 | { | |
3535 | if (mddev->resync_max == MaxSector) | |
3536 | return sprintf(page, "max\n"); | |
3537 | else | |
3538 | return sprintf(page, "%llu\n", | |
3539 | (unsigned long long)mddev->resync_max); | |
3540 | } | |
3541 | static ssize_t | |
3542 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3543 | { | |
3544 | if (strncmp(buf, "max", 3) == 0) | |
3545 | mddev->resync_max = MaxSector; | |
3546 | else { | |
5e96ee65 NB |
3547 | unsigned long long max; |
3548 | if (strict_strtoull(buf, 10, &max)) | |
3549 | return -EINVAL; | |
3550 | if (max < mddev->resync_min) | |
c6207277 N |
3551 | return -EINVAL; |
3552 | if (max < mddev->resync_max && | |
3553 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3554 | return -EBUSY; | |
3555 | ||
3556 | /* Must be a multiple of chunk_size */ | |
3557 | if (mddev->chunk_size) { | |
3558 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3559 | return -EINVAL; | |
3560 | } | |
3561 | mddev->resync_max = max; | |
3562 | } | |
3563 | wake_up(&mddev->recovery_wait); | |
3564 | return len; | |
3565 | } | |
3566 | ||
3567 | static struct md_sysfs_entry md_max_sync = | |
3568 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3569 | ||
e464eafd N |
3570 | static ssize_t |
3571 | suspend_lo_show(mddev_t *mddev, char *page) | |
3572 | { | |
3573 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3574 | } | |
3575 | ||
3576 | static ssize_t | |
3577 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3578 | { | |
3579 | char *e; | |
3580 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3581 | ||
3582 | if (mddev->pers->quiesce == NULL) | |
3583 | return -EINVAL; | |
3584 | if (buf == e || (*e && *e != '\n')) | |
3585 | return -EINVAL; | |
3586 | if (new >= mddev->suspend_hi || | |
3587 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3588 | mddev->suspend_lo = new; | |
3589 | mddev->pers->quiesce(mddev, 2); | |
3590 | return len; | |
3591 | } else | |
3592 | return -EINVAL; | |
3593 | } | |
3594 | static struct md_sysfs_entry md_suspend_lo = | |
3595 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3596 | ||
3597 | ||
3598 | static ssize_t | |
3599 | suspend_hi_show(mddev_t *mddev, char *page) | |
3600 | { | |
3601 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3602 | } | |
3603 | ||
3604 | static ssize_t | |
3605 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3606 | { | |
3607 | char *e; | |
3608 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3609 | ||
3610 | if (mddev->pers->quiesce == NULL) | |
3611 | return -EINVAL; | |
3612 | if (buf == e || (*e && *e != '\n')) | |
3613 | return -EINVAL; | |
3614 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3615 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3616 | mddev->suspend_hi = new; | |
3617 | mddev->pers->quiesce(mddev, 1); | |
3618 | mddev->pers->quiesce(mddev, 0); | |
3619 | return len; | |
3620 | } else | |
3621 | return -EINVAL; | |
3622 | } | |
3623 | static struct md_sysfs_entry md_suspend_hi = | |
3624 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3625 | ||
08a02ecd N |
3626 | static ssize_t |
3627 | reshape_position_show(mddev_t *mddev, char *page) | |
3628 | { | |
3629 | if (mddev->reshape_position != MaxSector) | |
3630 | return sprintf(page, "%llu\n", | |
3631 | (unsigned long long)mddev->reshape_position); | |
3632 | strcpy(page, "none\n"); | |
3633 | return 5; | |
3634 | } | |
3635 | ||
3636 | static ssize_t | |
3637 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3638 | { | |
3639 | char *e; | |
3640 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3641 | if (mddev->pers) | |
3642 | return -EBUSY; | |
3643 | if (buf == e || (*e && *e != '\n')) | |
3644 | return -EINVAL; | |
3645 | mddev->reshape_position = new; | |
3646 | mddev->delta_disks = 0; | |
3647 | mddev->new_level = mddev->level; | |
3648 | mddev->new_layout = mddev->layout; | |
3649 | mddev->new_chunk = mddev->chunk_size; | |
3650 | return len; | |
3651 | } | |
3652 | ||
3653 | static struct md_sysfs_entry md_reshape_position = | |
3654 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3655 | reshape_position_store); | |
3656 | ||
b522adcd DW |
3657 | static ssize_t |
3658 | array_size_show(mddev_t *mddev, char *page) | |
3659 | { | |
3660 | if (mddev->external_size) | |
3661 | return sprintf(page, "%llu\n", | |
3662 | (unsigned long long)mddev->array_sectors/2); | |
3663 | else | |
3664 | return sprintf(page, "default\n"); | |
3665 | } | |
3666 | ||
3667 | static ssize_t | |
3668 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3669 | { | |
3670 | sector_t sectors; | |
3671 | ||
3672 | if (strncmp(buf, "default", 7) == 0) { | |
3673 | if (mddev->pers) | |
3674 | sectors = mddev->pers->size(mddev, 0, 0); | |
3675 | else | |
3676 | sectors = mddev->array_sectors; | |
3677 | ||
3678 | mddev->external_size = 0; | |
3679 | } else { | |
3680 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
3681 | return -EINVAL; | |
3682 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
3683 | return -EINVAL; | |
3684 | ||
3685 | mddev->external_size = 1; | |
3686 | } | |
3687 | ||
3688 | mddev->array_sectors = sectors; | |
3689 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
3690 | if (mddev->pers) { | |
3691 | struct block_device *bdev = bdget_disk(mddev->gendisk, 0); | |
3692 | ||
3693 | if (bdev) { | |
3694 | mutex_lock(&bdev->bd_inode->i_mutex); | |
3695 | i_size_write(bdev->bd_inode, | |
3696 | (loff_t)mddev->array_sectors << 9); | |
3697 | mutex_unlock(&bdev->bd_inode->i_mutex); | |
3698 | bdput(bdev); | |
3699 | } | |
3700 | } | |
3701 | ||
3702 | return len; | |
3703 | } | |
3704 | ||
3705 | static struct md_sysfs_entry md_array_size = | |
3706 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
3707 | array_size_store); | |
e464eafd | 3708 | |
eae1701f N |
3709 | static struct attribute *md_default_attrs[] = { |
3710 | &md_level.attr, | |
d4dbd025 | 3711 | &md_layout.attr, |
eae1701f | 3712 | &md_raid_disks.attr, |
3b34380a | 3713 | &md_chunk_size.attr, |
a35b0d69 | 3714 | &md_size.attr, |
a94213b1 | 3715 | &md_resync_start.attr, |
8bb93aac | 3716 | &md_metadata.attr, |
6d7ff738 | 3717 | &md_new_device.attr, |
16f17b39 | 3718 | &md_safe_delay.attr, |
9e653b63 | 3719 | &md_array_state.attr, |
08a02ecd | 3720 | &md_reshape_position.attr, |
b522adcd | 3721 | &md_array_size.attr, |
411036fa N |
3722 | NULL, |
3723 | }; | |
3724 | ||
3725 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3726 | &md_scan_mode.attr, |
9d88883e | 3727 | &md_mismatches.attr, |
88202a0c N |
3728 | &md_sync_min.attr, |
3729 | &md_sync_max.attr, | |
3730 | &md_sync_speed.attr, | |
90b08710 | 3731 | &md_sync_force_parallel.attr, |
88202a0c | 3732 | &md_sync_completed.attr, |
5e96ee65 | 3733 | &md_min_sync.attr, |
c6207277 | 3734 | &md_max_sync.attr, |
e464eafd N |
3735 | &md_suspend_lo.attr, |
3736 | &md_suspend_hi.attr, | |
9b1d1dac | 3737 | &md_bitmap.attr, |
d7f3d291 | 3738 | &md_degraded.attr, |
eae1701f N |
3739 | NULL, |
3740 | }; | |
411036fa N |
3741 | static struct attribute_group md_redundancy_group = { |
3742 | .name = NULL, | |
3743 | .attrs = md_redundancy_attrs, | |
3744 | }; | |
3745 | ||
eae1701f N |
3746 | |
3747 | static ssize_t | |
3748 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3749 | { | |
3750 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3751 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3752 | ssize_t rv; |
eae1701f N |
3753 | |
3754 | if (!entry->show) | |
3755 | return -EIO; | |
5dc5cf7d IM |
3756 | rv = mddev_lock(mddev); |
3757 | if (!rv) { | |
3758 | rv = entry->show(mddev, page); | |
3759 | mddev_unlock(mddev); | |
3760 | } | |
96de1e66 | 3761 | return rv; |
eae1701f N |
3762 | } |
3763 | ||
3764 | static ssize_t | |
3765 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3766 | const char *page, size_t length) | |
3767 | { | |
3768 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3769 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3770 | ssize_t rv; |
eae1701f N |
3771 | |
3772 | if (!entry->store) | |
3773 | return -EIO; | |
67463acb N |
3774 | if (!capable(CAP_SYS_ADMIN)) |
3775 | return -EACCES; | |
5dc5cf7d | 3776 | rv = mddev_lock(mddev); |
d3374825 N |
3777 | if (mddev->hold_active == UNTIL_IOCTL) |
3778 | mddev->hold_active = 0; | |
5dc5cf7d IM |
3779 | if (!rv) { |
3780 | rv = entry->store(mddev, page, length); | |
3781 | mddev_unlock(mddev); | |
3782 | } | |
96de1e66 | 3783 | return rv; |
eae1701f N |
3784 | } |
3785 | ||
3786 | static void md_free(struct kobject *ko) | |
3787 | { | |
3788 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
3789 | |
3790 | if (mddev->sysfs_state) | |
3791 | sysfs_put(mddev->sysfs_state); | |
3792 | ||
3793 | if (mddev->gendisk) { | |
3794 | del_gendisk(mddev->gendisk); | |
3795 | put_disk(mddev->gendisk); | |
3796 | } | |
3797 | if (mddev->queue) | |
3798 | blk_cleanup_queue(mddev->queue); | |
3799 | ||
eae1701f N |
3800 | kfree(mddev); |
3801 | } | |
3802 | ||
3803 | static struct sysfs_ops md_sysfs_ops = { | |
3804 | .show = md_attr_show, | |
3805 | .store = md_attr_store, | |
3806 | }; | |
3807 | static struct kobj_type md_ktype = { | |
3808 | .release = md_free, | |
3809 | .sysfs_ops = &md_sysfs_ops, | |
3810 | .default_attrs = md_default_attrs, | |
3811 | }; | |
3812 | ||
1da177e4 LT |
3813 | int mdp_major = 0; |
3814 | ||
5fd3a17e DW |
3815 | static void mddev_delayed_delete(struct work_struct *ws) |
3816 | { | |
3817 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
3818 | ||
3819 | if (mddev->private == &md_redundancy_group) { | |
3820 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
3821 | if (mddev->sysfs_action) | |
3822 | sysfs_put(mddev->sysfs_action); | |
3823 | mddev->sysfs_action = NULL; | |
3824 | mddev->private = NULL; | |
3825 | } | |
3826 | kobject_del(&mddev->kobj); | |
3827 | kobject_put(&mddev->kobj); | |
3828 | } | |
3829 | ||
efeb53c0 | 3830 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 3831 | { |
48c9c27b | 3832 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3833 | mddev_t *mddev = mddev_find(dev); |
3834 | struct gendisk *disk; | |
efeb53c0 N |
3835 | int partitioned; |
3836 | int shift; | |
3837 | int unit; | |
3830c62f | 3838 | int error; |
1da177e4 LT |
3839 | |
3840 | if (!mddev) | |
efeb53c0 N |
3841 | return -ENODEV; |
3842 | ||
3843 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
3844 | shift = partitioned ? MdpMinorShift : 0; | |
3845 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 3846 | |
d3374825 N |
3847 | /* wait for any previous instance if this device |
3848 | * to be completed removed (mddev_delayed_delete). | |
3849 | */ | |
3850 | flush_scheduled_work(); | |
3851 | ||
48c9c27b | 3852 | mutex_lock(&disks_mutex); |
1da177e4 | 3853 | if (mddev->gendisk) { |
48c9c27b | 3854 | mutex_unlock(&disks_mutex); |
1da177e4 | 3855 | mddev_put(mddev); |
efeb53c0 N |
3856 | return -EEXIST; |
3857 | } | |
3858 | ||
3859 | if (name) { | |
3860 | /* Need to ensure that 'name' is not a duplicate. | |
3861 | */ | |
3862 | mddev_t *mddev2; | |
3863 | spin_lock(&all_mddevs_lock); | |
3864 | ||
3865 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
3866 | if (mddev2->gendisk && | |
3867 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
3868 | spin_unlock(&all_mddevs_lock); | |
3869 | return -EEXIST; | |
3870 | } | |
3871 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 3872 | } |
8b765398 N |
3873 | |
3874 | mddev->queue = blk_alloc_queue(GFP_KERNEL); | |
3875 | if (!mddev->queue) { | |
3876 | mutex_unlock(&disks_mutex); | |
3877 | mddev_put(mddev); | |
efeb53c0 | 3878 | return -ENOMEM; |
8b765398 | 3879 | } |
409c57f3 N |
3880 | mddev->queue->queuedata = mddev; |
3881 | ||
8b765398 N |
3882 | /* Can be unlocked because the queue is new: no concurrency */ |
3883 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
3884 | ||
409c57f3 | 3885 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 3886 | |
1da177e4 LT |
3887 | disk = alloc_disk(1 << shift); |
3888 | if (!disk) { | |
48c9c27b | 3889 | mutex_unlock(&disks_mutex); |
8b765398 N |
3890 | blk_cleanup_queue(mddev->queue); |
3891 | mddev->queue = NULL; | |
1da177e4 | 3892 | mddev_put(mddev); |
efeb53c0 | 3893 | return -ENOMEM; |
1da177e4 | 3894 | } |
efeb53c0 | 3895 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 3896 | disk->first_minor = unit << shift; |
efeb53c0 N |
3897 | if (name) |
3898 | strcpy(disk->disk_name, name); | |
3899 | else if (partitioned) | |
1da177e4 | 3900 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3901 | else |
1da177e4 | 3902 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3903 | disk->fops = &md_fops; |
3904 | disk->private_data = mddev; | |
3905 | disk->queue = mddev->queue; | |
92850bbd | 3906 | /* Allow extended partitions. This makes the |
d3374825 | 3907 | * 'mdp' device redundant, but we can't really |
92850bbd N |
3908 | * remove it now. |
3909 | */ | |
3910 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
3911 | add_disk(disk); |
3912 | mddev->gendisk = disk; | |
ed9e1982 TH |
3913 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
3914 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
f48ed538 | 3915 | mutex_unlock(&disks_mutex); |
3830c62f | 3916 | if (error) |
5e55e2f5 N |
3917 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3918 | disk->disk_name); | |
b62b7590 | 3919 | else { |
3830c62f | 3920 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
3921 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
3922 | } | |
d3374825 | 3923 | mddev_put(mddev); |
efeb53c0 N |
3924 | return 0; |
3925 | } | |
3926 | ||
3927 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3928 | { | |
3929 | md_alloc(dev, NULL); | |
1da177e4 LT |
3930 | return NULL; |
3931 | } | |
3932 | ||
efeb53c0 N |
3933 | static int add_named_array(const char *val, struct kernel_param *kp) |
3934 | { | |
3935 | /* val must be "md_*" where * is not all digits. | |
3936 | * We allocate an array with a large free minor number, and | |
3937 | * set the name to val. val must not already be an active name. | |
3938 | */ | |
3939 | int len = strlen(val); | |
3940 | char buf[DISK_NAME_LEN]; | |
3941 | ||
3942 | while (len && val[len-1] == '\n') | |
3943 | len--; | |
3944 | if (len >= DISK_NAME_LEN) | |
3945 | return -E2BIG; | |
3946 | strlcpy(buf, val, len+1); | |
3947 | if (strncmp(buf, "md_", 3) != 0) | |
3948 | return -EINVAL; | |
3949 | return md_alloc(0, buf); | |
3950 | } | |
3951 | ||
1da177e4 LT |
3952 | static void md_safemode_timeout(unsigned long data) |
3953 | { | |
3954 | mddev_t *mddev = (mddev_t *) data; | |
3955 | ||
0fd62b86 NB |
3956 | if (!atomic_read(&mddev->writes_pending)) { |
3957 | mddev->safemode = 1; | |
3958 | if (mddev->external) | |
b62b7590 | 3959 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 3960 | } |
1da177e4 LT |
3961 | md_wakeup_thread(mddev->thread); |
3962 | } | |
3963 | ||
6ff8d8ec | 3964 | static int start_dirty_degraded; |
1da177e4 LT |
3965 | |
3966 | static int do_md_run(mddev_t * mddev) | |
3967 | { | |
2604b703 | 3968 | int err; |
1da177e4 | 3969 | int chunk_size; |
1da177e4 LT |
3970 | mdk_rdev_t *rdev; |
3971 | struct gendisk *disk; | |
2604b703 | 3972 | struct mdk_personality *pers; |
1da177e4 LT |
3973 | char b[BDEVNAME_SIZE]; |
3974 | ||
a757e64c N |
3975 | if (list_empty(&mddev->disks)) |
3976 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3977 | return -EINVAL; |
1da177e4 LT |
3978 | |
3979 | if (mddev->pers) | |
3980 | return -EBUSY; | |
3981 | ||
3982 | /* | |
3983 | * Analyze all RAID superblock(s) | |
3984 | */ | |
1ec4a939 N |
3985 | if (!mddev->raid_disks) { |
3986 | if (!mddev->persistent) | |
3987 | return -EINVAL; | |
a757e64c | 3988 | analyze_sbs(mddev); |
1ec4a939 | 3989 | } |
1da177e4 LT |
3990 | |
3991 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3992 | |
3993 | if (chunk_size) { | |
1da177e4 LT |
3994 | if (chunk_size > MAX_CHUNK_SIZE) { |
3995 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3996 | chunk_size, MAX_CHUNK_SIZE); | |
3997 | return -EINVAL; | |
3998 | } | |
3999 | /* | |
4bbf3771 | 4000 | * chunk-size has to be a power of 2 |
1da177e4 LT |
4001 | */ |
4002 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 4003 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
4004 | return -EINVAL; |
4005 | } | |
1da177e4 LT |
4006 | |
4007 | /* devices must have minimum size of one chunk */ | |
159ec1fc | 4008 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4009 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4010 | continue; |
dd8ac336 | 4011 | if (rdev->sectors < chunk_size / 512) { |
1da177e4 LT |
4012 | printk(KERN_WARNING |
4013 | "md: Dev %s smaller than chunk_size:" | |
dd8ac336 | 4014 | " %llu < %d\n", |
1da177e4 | 4015 | bdevname(rdev->bdev,b), |
dd8ac336 AN |
4016 | (unsigned long long)rdev->sectors, |
4017 | chunk_size / 512); | |
1da177e4 LT |
4018 | return -EINVAL; |
4019 | } | |
4020 | } | |
4021 | } | |
4022 | ||
d9d166c2 N |
4023 | if (mddev->level != LEVEL_NONE) |
4024 | request_module("md-level-%d", mddev->level); | |
4025 | else if (mddev->clevel[0]) | |
4026 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4027 | |
4028 | /* | |
4029 | * Drop all container device buffers, from now on | |
4030 | * the only valid external interface is through the md | |
4031 | * device. | |
1da177e4 | 4032 | */ |
159ec1fc | 4033 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4034 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4035 | continue; |
4036 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4037 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4038 | |
4039 | /* perform some consistency tests on the device. | |
4040 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4041 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4042 | */ |
0f420358 | 4043 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4044 | if (mddev->dev_sectors && |
4045 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4046 | > rdev->sb_start) { |
f0d76d70 N |
4047 | printk("md: %s: data overlaps metadata\n", |
4048 | mdname(mddev)); | |
4049 | return -EINVAL; | |
4050 | } | |
4051 | } else { | |
0f420358 | 4052 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4053 | > rdev->data_offset) { |
4054 | printk("md: %s: metadata overlaps data\n", | |
4055 | mdname(mddev)); | |
4056 | return -EINVAL; | |
4057 | } | |
4058 | } | |
3c0ee63a | 4059 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
4060 | } |
4061 | ||
4062 | md_probe(mddev->unit, NULL, NULL); | |
4063 | disk = mddev->gendisk; | |
4064 | if (!disk) | |
4065 | return -ENOMEM; | |
4066 | ||
4067 | spin_lock(&pers_lock); | |
d9d166c2 | 4068 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4069 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4070 | spin_unlock(&pers_lock); |
d9d166c2 N |
4071 | if (mddev->level != LEVEL_NONE) |
4072 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4073 | mddev->level); | |
4074 | else | |
4075 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4076 | mddev->clevel); | |
1da177e4 LT |
4077 | return -EINVAL; |
4078 | } | |
2604b703 | 4079 | mddev->pers = pers; |
1da177e4 | 4080 | spin_unlock(&pers_lock); |
34817e8c N |
4081 | if (mddev->level != pers->level) { |
4082 | mddev->level = pers->level; | |
4083 | mddev->new_level = pers->level; | |
4084 | } | |
d9d166c2 | 4085 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4086 | |
3f9d99c1 MP |
4087 | if (pers->level >= 4 && pers->level <= 6) |
4088 | /* Cannot support integrity (yet) */ | |
4089 | blk_integrity_unregister(mddev->gendisk); | |
4090 | ||
f6705578 | 4091 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4092 | pers->start_reshape == NULL) { |
f6705578 N |
4093 | /* This personality cannot handle reshaping... */ |
4094 | mddev->pers = NULL; | |
4095 | module_put(pers->owner); | |
4096 | return -EINVAL; | |
4097 | } | |
4098 | ||
7dd5e7c3 N |
4099 | if (pers->sync_request) { |
4100 | /* Warn if this is a potentially silly | |
4101 | * configuration. | |
4102 | */ | |
4103 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4104 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4105 | int warned = 0; |
159ec1fc CR |
4106 | |
4107 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4108 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4109 | if (rdev < rdev2 && |
4110 | rdev->bdev->bd_contains == | |
4111 | rdev2->bdev->bd_contains) { | |
4112 | printk(KERN_WARNING | |
4113 | "%s: WARNING: %s appears to be" | |
4114 | " on the same physical disk as" | |
4115 | " %s.\n", | |
4116 | mdname(mddev), | |
4117 | bdevname(rdev->bdev,b), | |
4118 | bdevname(rdev2->bdev,b2)); | |
4119 | warned = 1; | |
4120 | } | |
4121 | } | |
159ec1fc | 4122 | |
7dd5e7c3 N |
4123 | if (warned) |
4124 | printk(KERN_WARNING | |
4125 | "True protection against single-disk" | |
4126 | " failure might be compromised.\n"); | |
4127 | } | |
4128 | ||
657390d2 | 4129 | mddev->recovery = 0; |
58c0fed4 AN |
4130 | /* may be over-ridden by personality */ |
4131 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4132 | ||
a9701a30 | 4133 | mddev->barriers_work = 1; |
6ff8d8ec | 4134 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4135 | |
f91de92e N |
4136 | if (start_readonly) |
4137 | mddev->ro = 2; /* read-only, but switch on first write */ | |
4138 | ||
b15c2e57 | 4139 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4140 | if (err) |
4141 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4142 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4143 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4144 | " but 'external_size' not in effect?\n", __func__); | |
4145 | printk(KERN_ERR | |
4146 | "md: invalid array_size %llu > default size %llu\n", | |
4147 | (unsigned long long)mddev->array_sectors / 2, | |
4148 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4149 | err = -EINVAL; | |
4150 | mddev->pers->stop(mddev); | |
4151 | } | |
4152 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4153 | err = bitmap_create(mddev); |
4154 | if (err) { | |
4155 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4156 | mdname(mddev), err); | |
4157 | mddev->pers->stop(mddev); | |
4158 | } | |
4159 | } | |
1da177e4 | 4160 | if (err) { |
1da177e4 LT |
4161 | module_put(mddev->pers->owner); |
4162 | mddev->pers = NULL; | |
32a7627c N |
4163 | bitmap_destroy(mddev); |
4164 | return err; | |
1da177e4 | 4165 | } |
5e55e2f5 N |
4166 | if (mddev->pers->sync_request) { |
4167 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
4168 | printk(KERN_WARNING | |
4169 | "md: cannot register extra attributes for %s\n", | |
4170 | mdname(mddev)); | |
0c3573f1 | 4171 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4172 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4173 | mddev->ro = 0; |
4174 | ||
1da177e4 LT |
4175 | atomic_set(&mddev->writes_pending,0); |
4176 | mddev->safemode = 0; | |
4177 | mddev->safemode_timer.function = md_safemode_timeout; | |
4178 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4179 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4180 | mddev->in_sync = 1; |
86e6ffdd | 4181 | |
159ec1fc | 4182 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4183 | if (rdev->raid_disk >= 0) { |
4184 | char nm[20]; | |
4185 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
4186 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
4187 | printk("md: cannot register %s for %s\n", | |
4188 | nm, mdname(mddev)); | |
86e6ffdd | 4189 | } |
1da177e4 LT |
4190 | |
4191 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4192 | ||
850b2b42 N |
4193 | if (mddev->flags) |
4194 | md_update_sb(mddev, 0); | |
1da177e4 | 4195 | |
f233ea5c | 4196 | set_capacity(disk, mddev->array_sectors); |
1da177e4 | 4197 | |
5fd6c1dc N |
4198 | /* If there is a partially-recovered drive we need to |
4199 | * start recovery here. If we leave it to md_check_recovery, | |
4200 | * it will remove the drives and not do the right thing | |
4201 | */ | |
0b8c9de0 | 4202 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 4203 | int spares = 0; |
159ec1fc | 4204 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
4205 | if (rdev->raid_disk >= 0 && |
4206 | !test_bit(In_sync, &rdev->flags) && | |
4207 | !test_bit(Faulty, &rdev->flags)) | |
4208 | /* complete an interrupted recovery */ | |
4209 | spares++; | |
4210 | if (spares && mddev->pers->sync_request) { | |
4211 | mddev->recovery = 0; | |
4212 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4213 | mddev->sync_thread = md_register_thread(md_do_sync, | |
4214 | mddev, | |
4215 | "%s_resync"); | |
4216 | if (!mddev->sync_thread) { | |
4217 | printk(KERN_ERR "%s: could not start resync" | |
4218 | " thread...\n", | |
4219 | mdname(mddev)); | |
4220 | /* leave the spares where they are, it shouldn't hurt */ | |
4221 | mddev->recovery = 0; | |
0b8c9de0 | 4222 | } |
5fd6c1dc N |
4223 | } |
4224 | } | |
0b8c9de0 N |
4225 | md_wakeup_thread(mddev->thread); |
4226 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4227 | |
44ce6294 | 4228 | mddev->changed = 1; |
d7603b7e | 4229 | md_new_event(mddev); |
b62b7590 | 4230 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
4231 | if (mddev->sysfs_action) |
4232 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 4233 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 4234 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
4235 | return 0; |
4236 | } | |
4237 | ||
4238 | static int restart_array(mddev_t *mddev) | |
4239 | { | |
4240 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4241 | |
80fab1d7 | 4242 | /* Complain if it has no devices */ |
1da177e4 | 4243 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4244 | return -ENXIO; |
4245 | if (!mddev->pers) | |
4246 | return -EINVAL; | |
4247 | if (!mddev->ro) | |
4248 | return -EBUSY; | |
4249 | mddev->safemode = 0; | |
4250 | mddev->ro = 0; | |
4251 | set_disk_ro(disk, 0); | |
4252 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4253 | mdname(mddev)); | |
4254 | /* Kick recovery or resync if necessary */ | |
4255 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4256 | md_wakeup_thread(mddev->thread); | |
4257 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 4258 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 4259 | return 0; |
1da177e4 LT |
4260 | } |
4261 | ||
acc55e22 N |
4262 | /* similar to deny_write_access, but accounts for our holding a reference |
4263 | * to the file ourselves */ | |
4264 | static int deny_bitmap_write_access(struct file * file) | |
4265 | { | |
4266 | struct inode *inode = file->f_mapping->host; | |
4267 | ||
4268 | spin_lock(&inode->i_lock); | |
4269 | if (atomic_read(&inode->i_writecount) > 1) { | |
4270 | spin_unlock(&inode->i_lock); | |
4271 | return -ETXTBSY; | |
4272 | } | |
4273 | atomic_set(&inode->i_writecount, -1); | |
4274 | spin_unlock(&inode->i_lock); | |
4275 | ||
4276 | return 0; | |
4277 | } | |
4278 | ||
4279 | static void restore_bitmap_write_access(struct file *file) | |
4280 | { | |
4281 | struct inode *inode = file->f_mapping->host; | |
4282 | ||
4283 | spin_lock(&inode->i_lock); | |
4284 | atomic_set(&inode->i_writecount, 1); | |
4285 | spin_unlock(&inode->i_lock); | |
4286 | } | |
4287 | ||
9e653b63 N |
4288 | /* mode: |
4289 | * 0 - completely stop and dis-assemble array | |
4290 | * 1 - switch to readonly | |
4291 | * 2 - stop but do not disassemble array | |
4292 | */ | |
df5b20cf | 4293 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
4294 | { |
4295 | int err = 0; | |
4296 | struct gendisk *disk = mddev->gendisk; | |
c4647292 | 4297 | mdk_rdev_t *rdev; |
1da177e4 | 4298 | |
f2ea68cf | 4299 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf NB |
4300 | printk("md: %s still in use.\n",mdname(mddev)); |
4301 | return -EBUSY; | |
4302 | } | |
4303 | ||
1da177e4 | 4304 | if (mddev->pers) { |
1da177e4 LT |
4305 | |
4306 | if (mddev->sync_thread) { | |
5fd6c1dc | 4307 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
4308 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4309 | md_unregister_thread(mddev->sync_thread); | |
4310 | mddev->sync_thread = NULL; | |
4311 | } | |
4312 | ||
4313 | del_timer_sync(&mddev->safemode_timer); | |
4314 | ||
9e653b63 N |
4315 | switch(mode) { |
4316 | case 1: /* readonly */ | |
1da177e4 | 4317 | err = -ENXIO; |
f91de92e | 4318 | if (mddev->ro==1) |
1da177e4 LT |
4319 | goto out; |
4320 | mddev->ro = 1; | |
9e653b63 N |
4321 | break; |
4322 | case 0: /* disassemble */ | |
4323 | case 2: /* stop */ | |
6b8b3e8a | 4324 | bitmap_flush(mddev); |
a9701a30 | 4325 | md_super_wait(mddev); |
1da177e4 LT |
4326 | if (mddev->ro) |
4327 | set_disk_ro(disk, 0); | |
409c57f3 | 4328 | |
1da177e4 | 4329 | mddev->pers->stop(mddev); |
d1b5380c N |
4330 | mddev->queue->merge_bvec_fn = NULL; |
4331 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 4332 | mddev->queue->backing_dev_info.congested_fn = NULL; |
1da177e4 | 4333 | module_put(mddev->pers->owner); |
5fd3a17e DW |
4334 | if (mddev->pers->sync_request) |
4335 | mddev->private = &md_redundancy_group; | |
1da177e4 | 4336 | mddev->pers = NULL; |
4f54b0e9 | 4337 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 4338 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 | 4339 | |
c4647292 N |
4340 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4341 | if (rdev->raid_disk >= 0) { | |
4342 | char nm[20]; | |
4343 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4344 | sysfs_remove_link(&mddev->kobj, nm); | |
4345 | } | |
4346 | ||
0d4ca600 | 4347 | set_capacity(disk, 0); |
44ce6294 | 4348 | mddev->changed = 1; |
0d4ca600 | 4349 | |
1da177e4 LT |
4350 | if (mddev->ro) |
4351 | mddev->ro = 0; | |
4352 | } | |
850b2b42 | 4353 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
4354 | /* mark array as shutdown cleanly */ |
4355 | mddev->in_sync = 1; | |
850b2b42 | 4356 | md_update_sb(mddev, 1); |
1da177e4 | 4357 | } |
9e653b63 | 4358 | if (mode == 1) |
1da177e4 | 4359 | set_disk_ro(disk, 1); |
5fd6c1dc | 4360 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 4361 | } |
32a7627c | 4362 | |
1da177e4 LT |
4363 | /* |
4364 | * Free resources if final stop | |
4365 | */ | |
9e653b63 | 4366 | if (mode == 0) { |
0d4ca600 | 4367 | |
1da177e4 LT |
4368 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4369 | ||
978f946b N |
4370 | bitmap_destroy(mddev); |
4371 | if (mddev->bitmap_file) { | |
acc55e22 | 4372 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
4373 | fput(mddev->bitmap_file); |
4374 | mddev->bitmap_file = NULL; | |
4375 | } | |
4376 | mddev->bitmap_offset = 0; | |
4377 | ||
177a99b2 | 4378 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
4379 | flush_scheduled_work(); |
4380 | ||
1da177e4 LT |
4381 | export_array(mddev); |
4382 | ||
f233ea5c | 4383 | mddev->array_sectors = 0; |
b522adcd | 4384 | mddev->external_size = 0; |
58c0fed4 | 4385 | mddev->dev_sectors = 0; |
9e653b63 | 4386 | mddev->raid_disks = 0; |
a94213b1 | 4387 | mddev->recovery_cp = 0; |
5e96ee65 | 4388 | mddev->resync_min = 0; |
c6207277 | 4389 | mddev->resync_max = MaxSector; |
08a02ecd | 4390 | mddev->reshape_position = MaxSector; |
e691063a | 4391 | mddev->external = 0; |
1ec4a939 | 4392 | mddev->persistent = 0; |
d897dbf9 N |
4393 | mddev->level = LEVEL_NONE; |
4394 | mddev->clevel[0] = 0; | |
4395 | mddev->flags = 0; | |
4396 | mddev->ro = 0; | |
4397 | mddev->metadata_type[0] = 0; | |
4398 | mddev->chunk_size = 0; | |
4399 | mddev->ctime = mddev->utime = 0; | |
4400 | mddev->layout = 0; | |
4401 | mddev->max_disks = 0; | |
4402 | mddev->events = 0; | |
4403 | mddev->delta_disks = 0; | |
4404 | mddev->new_level = LEVEL_NONE; | |
4405 | mddev->new_layout = 0; | |
4406 | mddev->new_chunk = 0; | |
4407 | mddev->curr_resync = 0; | |
4408 | mddev->resync_mismatches = 0; | |
4409 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4410 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4411 | mddev->recovery = 0; | |
4412 | mddev->in_sync = 0; | |
4413 | mddev->changed = 0; | |
4414 | mddev->degraded = 0; | |
4415 | mddev->barriers_work = 0; | |
4416 | mddev->safemode = 0; | |
934d9c23 | 4417 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4418 | if (mddev->hold_active == UNTIL_STOP) |
4419 | mddev->hold_active = 0; | |
9e653b63 | 4420 | |
a8a55c38 | 4421 | } else if (mddev->pers) |
1da177e4 LT |
4422 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4423 | mdname(mddev)); | |
4424 | err = 0; | |
3f9d99c1 | 4425 | blk_integrity_unregister(disk); |
d7603b7e | 4426 | md_new_event(mddev); |
b62b7590 | 4427 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4428 | out: |
4429 | return err; | |
4430 | } | |
4431 | ||
fdee8ae4 | 4432 | #ifndef MODULE |
1da177e4 LT |
4433 | static void autorun_array(mddev_t *mddev) |
4434 | { | |
4435 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4436 | int err; |
4437 | ||
a757e64c | 4438 | if (list_empty(&mddev->disks)) |
1da177e4 | 4439 | return; |
1da177e4 LT |
4440 | |
4441 | printk(KERN_INFO "md: running: "); | |
4442 | ||
159ec1fc | 4443 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4444 | char b[BDEVNAME_SIZE]; |
4445 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4446 | } | |
4447 | printk("\n"); | |
4448 | ||
d710e138 | 4449 | err = do_md_run(mddev); |
1da177e4 LT |
4450 | if (err) { |
4451 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4452 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4453 | } |
4454 | } | |
4455 | ||
4456 | /* | |
4457 | * lets try to run arrays based on all disks that have arrived | |
4458 | * until now. (those are in pending_raid_disks) | |
4459 | * | |
4460 | * the method: pick the first pending disk, collect all disks with | |
4461 | * the same UUID, remove all from the pending list and put them into | |
4462 | * the 'same_array' list. Then order this list based on superblock | |
4463 | * update time (freshest comes first), kick out 'old' disks and | |
4464 | * compare superblocks. If everything's fine then run it. | |
4465 | * | |
4466 | * If "unit" is allocated, then bump its reference count | |
4467 | */ | |
4468 | static void autorun_devices(int part) | |
4469 | { | |
159ec1fc | 4470 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4471 | mddev_t *mddev; |
4472 | char b[BDEVNAME_SIZE]; | |
4473 | ||
4474 | printk(KERN_INFO "md: autorun ...\n"); | |
4475 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4476 | int unit; |
1da177e4 | 4477 | dev_t dev; |
ad01c9e3 | 4478 | LIST_HEAD(candidates); |
1da177e4 LT |
4479 | rdev0 = list_entry(pending_raid_disks.next, |
4480 | mdk_rdev_t, same_set); | |
4481 | ||
4482 | printk(KERN_INFO "md: considering %s ...\n", | |
4483 | bdevname(rdev0->bdev,b)); | |
4484 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4485 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4486 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4487 | printk(KERN_INFO "md: adding %s ...\n", | |
4488 | bdevname(rdev->bdev,b)); | |
4489 | list_move(&rdev->same_set, &candidates); | |
4490 | } | |
4491 | /* | |
4492 | * now we have a set of devices, with all of them having | |
4493 | * mostly sane superblocks. It's time to allocate the | |
4494 | * mddev. | |
4495 | */ | |
e8703fe1 N |
4496 | if (part) { |
4497 | dev = MKDEV(mdp_major, | |
4498 | rdev0->preferred_minor << MdpMinorShift); | |
4499 | unit = MINOR(dev) >> MdpMinorShift; | |
4500 | } else { | |
4501 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4502 | unit = MINOR(dev); | |
4503 | } | |
4504 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4505 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4506 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4507 | break; | |
4508 | } | |
1da177e4 LT |
4509 | |
4510 | md_probe(dev, NULL, NULL); | |
4511 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4512 | if (!mddev || !mddev->gendisk) { |
4513 | if (mddev) | |
4514 | mddev_put(mddev); | |
4515 | printk(KERN_ERR | |
1da177e4 LT |
4516 | "md: cannot allocate memory for md drive.\n"); |
4517 | break; | |
4518 | } | |
4519 | if (mddev_lock(mddev)) | |
4520 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4521 | mdname(mddev)); | |
4522 | else if (mddev->raid_disks || mddev->major_version | |
4523 | || !list_empty(&mddev->disks)) { | |
4524 | printk(KERN_WARNING | |
4525 | "md: %s already running, cannot run %s\n", | |
4526 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4527 | mddev_unlock(mddev); | |
4528 | } else { | |
4529 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4530 | mddev->persistent = 1; |
159ec1fc | 4531 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4532 | list_del_init(&rdev->same_set); |
4533 | if (bind_rdev_to_array(rdev, mddev)) | |
4534 | export_rdev(rdev); | |
4535 | } | |
4536 | autorun_array(mddev); | |
4537 | mddev_unlock(mddev); | |
4538 | } | |
4539 | /* on success, candidates will be empty, on error | |
4540 | * it won't... | |
4541 | */ | |
159ec1fc | 4542 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4543 | list_del_init(&rdev->same_set); |
1da177e4 | 4544 | export_rdev(rdev); |
4b80991c | 4545 | } |
1da177e4 LT |
4546 | mddev_put(mddev); |
4547 | } | |
4548 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4549 | } | |
fdee8ae4 | 4550 | #endif /* !MODULE */ |
1da177e4 | 4551 | |
1da177e4 LT |
4552 | static int get_version(void __user * arg) |
4553 | { | |
4554 | mdu_version_t ver; | |
4555 | ||
4556 | ver.major = MD_MAJOR_VERSION; | |
4557 | ver.minor = MD_MINOR_VERSION; | |
4558 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4559 | ||
4560 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4561 | return -EFAULT; | |
4562 | ||
4563 | return 0; | |
4564 | } | |
4565 | ||
4566 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4567 | { | |
4568 | mdu_array_info_t info; | |
4569 | int nr,working,active,failed,spare; | |
4570 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4571 | |
4572 | nr=working=active=failed=spare=0; | |
159ec1fc | 4573 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4574 | nr++; |
b2d444d7 | 4575 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4576 | failed++; |
4577 | else { | |
4578 | working++; | |
b2d444d7 | 4579 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4580 | active++; |
4581 | else | |
4582 | spare++; | |
4583 | } | |
4584 | } | |
4585 | ||
4586 | info.major_version = mddev->major_version; | |
4587 | info.minor_version = mddev->minor_version; | |
4588 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4589 | info.ctime = mddev->ctime; | |
4590 | info.level = mddev->level; | |
58c0fed4 AN |
4591 | info.size = mddev->dev_sectors / 2; |
4592 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4593 | info.size = -1; |
1da177e4 LT |
4594 | info.nr_disks = nr; |
4595 | info.raid_disks = mddev->raid_disks; | |
4596 | info.md_minor = mddev->md_minor; | |
4597 | info.not_persistent= !mddev->persistent; | |
4598 | ||
4599 | info.utime = mddev->utime; | |
4600 | info.state = 0; | |
4601 | if (mddev->in_sync) | |
4602 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4603 | if (mddev->bitmap && mddev->bitmap_offset) |
4604 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4605 | info.active_disks = active; |
4606 | info.working_disks = working; | |
4607 | info.failed_disks = failed; | |
4608 | info.spare_disks = spare; | |
4609 | ||
4610 | info.layout = mddev->layout; | |
4611 | info.chunk_size = mddev->chunk_size; | |
4612 | ||
4613 | if (copy_to_user(arg, &info, sizeof(info))) | |
4614 | return -EFAULT; | |
4615 | ||
4616 | return 0; | |
4617 | } | |
4618 | ||
87162a28 | 4619 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4620 | { |
4621 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4622 | char *ptr, *buf = NULL; | |
4623 | int err = -ENOMEM; | |
4624 | ||
b5470dc5 DW |
4625 | if (md_allow_write(mddev)) |
4626 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4627 | else | |
4628 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4629 | |
32a7627c N |
4630 | if (!file) |
4631 | goto out; | |
4632 | ||
4633 | /* bitmap disabled, zero the first byte and copy out */ | |
4634 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4635 | file->pathname[0] = '\0'; | |
4636 | goto copy_out; | |
4637 | } | |
4638 | ||
4639 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4640 | if (!buf) | |
4641 | goto out; | |
4642 | ||
6bcfd601 CH |
4643 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4644 | if (IS_ERR(ptr)) | |
32a7627c N |
4645 | goto out; |
4646 | ||
4647 | strcpy(file->pathname, ptr); | |
4648 | ||
4649 | copy_out: | |
4650 | err = 0; | |
4651 | if (copy_to_user(arg, file, sizeof(*file))) | |
4652 | err = -EFAULT; | |
4653 | out: | |
4654 | kfree(buf); | |
4655 | kfree(file); | |
4656 | return err; | |
4657 | } | |
4658 | ||
1da177e4 LT |
4659 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4660 | { | |
4661 | mdu_disk_info_t info; | |
1da177e4 LT |
4662 | mdk_rdev_t *rdev; |
4663 | ||
4664 | if (copy_from_user(&info, arg, sizeof(info))) | |
4665 | return -EFAULT; | |
4666 | ||
26ef379f | 4667 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4668 | if (rdev) { |
4669 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4670 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4671 | info.raid_disk = rdev->raid_disk; | |
4672 | info.state = 0; | |
b2d444d7 | 4673 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4674 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4675 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4676 | info.state |= (1<<MD_DISK_ACTIVE); |
4677 | info.state |= (1<<MD_DISK_SYNC); | |
4678 | } | |
8ddf9efe N |
4679 | if (test_bit(WriteMostly, &rdev->flags)) |
4680 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4681 | } else { |
4682 | info.major = info.minor = 0; | |
4683 | info.raid_disk = -1; | |
4684 | info.state = (1<<MD_DISK_REMOVED); | |
4685 | } | |
4686 | ||
4687 | if (copy_to_user(arg, &info, sizeof(info))) | |
4688 | return -EFAULT; | |
4689 | ||
4690 | return 0; | |
4691 | } | |
4692 | ||
4693 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4694 | { | |
4695 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4696 | mdk_rdev_t *rdev; | |
4697 | dev_t dev = MKDEV(info->major,info->minor); | |
4698 | ||
4699 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4700 | return -EOVERFLOW; | |
4701 | ||
4702 | if (!mddev->raid_disks) { | |
4703 | int err; | |
4704 | /* expecting a device which has a superblock */ | |
4705 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4706 | if (IS_ERR(rdev)) { | |
4707 | printk(KERN_WARNING | |
4708 | "md: md_import_device returned %ld\n", | |
4709 | PTR_ERR(rdev)); | |
4710 | return PTR_ERR(rdev); | |
4711 | } | |
4712 | if (!list_empty(&mddev->disks)) { | |
4713 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4714 | mdk_rdev_t, same_set); | |
4715 | int err = super_types[mddev->major_version] | |
4716 | .load_super(rdev, rdev0, mddev->minor_version); | |
4717 | if (err < 0) { | |
4718 | printk(KERN_WARNING | |
4719 | "md: %s has different UUID to %s\n", | |
4720 | bdevname(rdev->bdev,b), | |
4721 | bdevname(rdev0->bdev,b2)); | |
4722 | export_rdev(rdev); | |
4723 | return -EINVAL; | |
4724 | } | |
4725 | } | |
4726 | err = bind_rdev_to_array(rdev, mddev); | |
4727 | if (err) | |
4728 | export_rdev(rdev); | |
4729 | return err; | |
4730 | } | |
4731 | ||
4732 | /* | |
4733 | * add_new_disk can be used once the array is assembled | |
4734 | * to add "hot spares". They must already have a superblock | |
4735 | * written | |
4736 | */ | |
4737 | if (mddev->pers) { | |
4738 | int err; | |
4739 | if (!mddev->pers->hot_add_disk) { | |
4740 | printk(KERN_WARNING | |
4741 | "%s: personality does not support diskops!\n", | |
4742 | mdname(mddev)); | |
4743 | return -EINVAL; | |
4744 | } | |
7b1e35f6 N |
4745 | if (mddev->persistent) |
4746 | rdev = md_import_device(dev, mddev->major_version, | |
4747 | mddev->minor_version); | |
4748 | else | |
4749 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4750 | if (IS_ERR(rdev)) { |
4751 | printk(KERN_WARNING | |
4752 | "md: md_import_device returned %ld\n", | |
4753 | PTR_ERR(rdev)); | |
4754 | return PTR_ERR(rdev); | |
4755 | } | |
41158c7e N |
4756 | /* set save_raid_disk if appropriate */ |
4757 | if (!mddev->persistent) { | |
4758 | if (info->state & (1<<MD_DISK_SYNC) && | |
4759 | info->raid_disk < mddev->raid_disks) | |
4760 | rdev->raid_disk = info->raid_disk; | |
4761 | else | |
4762 | rdev->raid_disk = -1; | |
4763 | } else | |
4764 | super_types[mddev->major_version]. | |
4765 | validate_super(mddev, rdev); | |
4766 | rdev->saved_raid_disk = rdev->raid_disk; | |
4767 | ||
b2d444d7 | 4768 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4769 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4770 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
4771 | else |
4772 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 4773 | |
1da177e4 LT |
4774 | rdev->raid_disk = -1; |
4775 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4776 | if (!err && !mddev->pers->hot_remove_disk) { |
4777 | /* If there is hot_add_disk but no hot_remove_disk | |
4778 | * then added disks for geometry changes, | |
4779 | * and should be added immediately. | |
4780 | */ | |
4781 | super_types[mddev->major_version]. | |
4782 | validate_super(mddev, rdev); | |
4783 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4784 | if (err) | |
4785 | unbind_rdev_from_array(rdev); | |
4786 | } | |
1da177e4 LT |
4787 | if (err) |
4788 | export_rdev(rdev); | |
52664732 | 4789 | else |
3c0ee63a | 4790 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4791 | |
17571284 | 4792 | md_update_sb(mddev, 1); |
72a23c21 NB |
4793 | if (mddev->degraded) |
4794 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4795 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4796 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4797 | return err; |
4798 | } | |
4799 | ||
4800 | /* otherwise, add_new_disk is only allowed | |
4801 | * for major_version==0 superblocks | |
4802 | */ | |
4803 | if (mddev->major_version != 0) { | |
4804 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4805 | mdname(mddev)); | |
4806 | return -EINVAL; | |
4807 | } | |
4808 | ||
4809 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4810 | int err; | |
d710e138 | 4811 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4812 | if (IS_ERR(rdev)) { |
4813 | printk(KERN_WARNING | |
4814 | "md: error, md_import_device() returned %ld\n", | |
4815 | PTR_ERR(rdev)); | |
4816 | return PTR_ERR(rdev); | |
4817 | } | |
4818 | rdev->desc_nr = info->number; | |
4819 | if (info->raid_disk < mddev->raid_disks) | |
4820 | rdev->raid_disk = info->raid_disk; | |
4821 | else | |
4822 | rdev->raid_disk = -1; | |
4823 | ||
1da177e4 | 4824 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4825 | if (info->state & (1<<MD_DISK_SYNC)) |
4826 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4827 | |
8ddf9efe N |
4828 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4829 | set_bit(WriteMostly, &rdev->flags); | |
4830 | ||
1da177e4 LT |
4831 | if (!mddev->persistent) { |
4832 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4833 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4834 | } else |
0f420358 | 4835 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
dd8ac336 | 4836 | rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size); |
1da177e4 | 4837 | |
2bf071bf N |
4838 | err = bind_rdev_to_array(rdev, mddev); |
4839 | if (err) { | |
4840 | export_rdev(rdev); | |
4841 | return err; | |
4842 | } | |
1da177e4 LT |
4843 | } |
4844 | ||
4845 | return 0; | |
4846 | } | |
4847 | ||
4848 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4849 | { | |
4850 | char b[BDEVNAME_SIZE]; | |
4851 | mdk_rdev_t *rdev; | |
4852 | ||
1da177e4 LT |
4853 | rdev = find_rdev(mddev, dev); |
4854 | if (!rdev) | |
4855 | return -ENXIO; | |
4856 | ||
4857 | if (rdev->raid_disk >= 0) | |
4858 | goto busy; | |
4859 | ||
4860 | kick_rdev_from_array(rdev); | |
850b2b42 | 4861 | md_update_sb(mddev, 1); |
d7603b7e | 4862 | md_new_event(mddev); |
1da177e4 LT |
4863 | |
4864 | return 0; | |
4865 | busy: | |
fdefa4d8 | 4866 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4867 | bdevname(rdev->bdev,b), mdname(mddev)); |
4868 | return -EBUSY; | |
4869 | } | |
4870 | ||
4871 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4872 | { | |
4873 | char b[BDEVNAME_SIZE]; | |
4874 | int err; | |
1da177e4 LT |
4875 | mdk_rdev_t *rdev; |
4876 | ||
4877 | if (!mddev->pers) | |
4878 | return -ENODEV; | |
4879 | ||
4880 | if (mddev->major_version != 0) { | |
4881 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4882 | " version-0 superblocks.\n", | |
4883 | mdname(mddev)); | |
4884 | return -EINVAL; | |
4885 | } | |
4886 | if (!mddev->pers->hot_add_disk) { | |
4887 | printk(KERN_WARNING | |
4888 | "%s: personality does not support diskops!\n", | |
4889 | mdname(mddev)); | |
4890 | return -EINVAL; | |
4891 | } | |
4892 | ||
d710e138 | 4893 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4894 | if (IS_ERR(rdev)) { |
4895 | printk(KERN_WARNING | |
4896 | "md: error, md_import_device() returned %ld\n", | |
4897 | PTR_ERR(rdev)); | |
4898 | return -EINVAL; | |
4899 | } | |
4900 | ||
4901 | if (mddev->persistent) | |
0f420358 | 4902 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4903 | else |
0f420358 | 4904 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4905 | |
dd8ac336 | 4906 | rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size); |
1da177e4 | 4907 | |
b2d444d7 | 4908 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4909 | printk(KERN_WARNING |
4910 | "md: can not hot-add faulty %s disk to %s!\n", | |
4911 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4912 | err = -EINVAL; | |
4913 | goto abort_export; | |
4914 | } | |
b2d444d7 | 4915 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4916 | rdev->desc_nr = -1; |
5842730d | 4917 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4918 | err = bind_rdev_to_array(rdev, mddev); |
4919 | if (err) | |
4920 | goto abort_export; | |
1da177e4 LT |
4921 | |
4922 | /* | |
4923 | * The rest should better be atomic, we can have disk failures | |
4924 | * noticed in interrupt contexts ... | |
4925 | */ | |
4926 | ||
1da177e4 LT |
4927 | rdev->raid_disk = -1; |
4928 | ||
850b2b42 | 4929 | md_update_sb(mddev, 1); |
1da177e4 LT |
4930 | |
4931 | /* | |
4932 | * Kick recovery, maybe this spare has to be added to the | |
4933 | * array immediately. | |
4934 | */ | |
4935 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4936 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4937 | md_new_event(mddev); |
1da177e4 LT |
4938 | return 0; |
4939 | ||
1da177e4 LT |
4940 | abort_export: |
4941 | export_rdev(rdev); | |
4942 | return err; | |
4943 | } | |
4944 | ||
32a7627c N |
4945 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4946 | { | |
4947 | int err; | |
4948 | ||
36fa3063 N |
4949 | if (mddev->pers) { |
4950 | if (!mddev->pers->quiesce) | |
4951 | return -EBUSY; | |
4952 | if (mddev->recovery || mddev->sync_thread) | |
4953 | return -EBUSY; | |
4954 | /* we should be able to change the bitmap.. */ | |
4955 | } | |
32a7627c | 4956 | |
32a7627c | 4957 | |
36fa3063 N |
4958 | if (fd >= 0) { |
4959 | if (mddev->bitmap) | |
4960 | return -EEXIST; /* cannot add when bitmap is present */ | |
4961 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4962 | |
36fa3063 N |
4963 | if (mddev->bitmap_file == NULL) { |
4964 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4965 | mdname(mddev)); | |
4966 | return -EBADF; | |
4967 | } | |
4968 | ||
4969 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4970 | if (err) { | |
4971 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4972 | mdname(mddev)); | |
4973 | fput(mddev->bitmap_file); | |
4974 | mddev->bitmap_file = NULL; | |
4975 | return err; | |
4976 | } | |
a654b9d8 | 4977 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4978 | } else if (mddev->bitmap == NULL) |
4979 | return -ENOENT; /* cannot remove what isn't there */ | |
4980 | err = 0; | |
4981 | if (mddev->pers) { | |
4982 | mddev->pers->quiesce(mddev, 1); | |
4983 | if (fd >= 0) | |
4984 | err = bitmap_create(mddev); | |
d7375ab3 | 4985 | if (fd < 0 || err) { |
36fa3063 | 4986 | bitmap_destroy(mddev); |
d7375ab3 N |
4987 | fd = -1; /* make sure to put the file */ |
4988 | } | |
36fa3063 | 4989 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4990 | } |
4991 | if (fd < 0) { | |
acc55e22 N |
4992 | if (mddev->bitmap_file) { |
4993 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4994 | fput(mddev->bitmap_file); |
acc55e22 | 4995 | } |
36fa3063 N |
4996 | mddev->bitmap_file = NULL; |
4997 | } | |
4998 | ||
32a7627c N |
4999 | return err; |
5000 | } | |
5001 | ||
1da177e4 LT |
5002 | /* |
5003 | * set_array_info is used two different ways | |
5004 | * The original usage is when creating a new array. | |
5005 | * In this usage, raid_disks is > 0 and it together with | |
5006 | * level, size, not_persistent,layout,chunksize determine the | |
5007 | * shape of the array. | |
5008 | * This will always create an array with a type-0.90.0 superblock. | |
5009 | * The newer usage is when assembling an array. | |
5010 | * In this case raid_disks will be 0, and the major_version field is | |
5011 | * use to determine which style super-blocks are to be found on the devices. | |
5012 | * The minor and patch _version numbers are also kept incase the | |
5013 | * super_block handler wishes to interpret them. | |
5014 | */ | |
5015 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5016 | { | |
5017 | ||
5018 | if (info->raid_disks == 0) { | |
5019 | /* just setting version number for superblock loading */ | |
5020 | if (info->major_version < 0 || | |
50511da3 | 5021 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5022 | super_types[info->major_version].name == NULL) { |
5023 | /* maybe try to auto-load a module? */ | |
5024 | printk(KERN_INFO | |
5025 | "md: superblock version %d not known\n", | |
5026 | info->major_version); | |
5027 | return -EINVAL; | |
5028 | } | |
5029 | mddev->major_version = info->major_version; | |
5030 | mddev->minor_version = info->minor_version; | |
5031 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5032 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
5033 | return 0; |
5034 | } | |
5035 | mddev->major_version = MD_MAJOR_VERSION; | |
5036 | mddev->minor_version = MD_MINOR_VERSION; | |
5037 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5038 | mddev->ctime = get_seconds(); | |
5039 | ||
5040 | mddev->level = info->level; | |
17115e03 | 5041 | mddev->clevel[0] = 0; |
58c0fed4 | 5042 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5043 | mddev->raid_disks = info->raid_disks; |
5044 | /* don't set md_minor, it is determined by which /dev/md* was | |
5045 | * openned | |
5046 | */ | |
5047 | if (info->state & (1<<MD_SB_CLEAN)) | |
5048 | mddev->recovery_cp = MaxSector; | |
5049 | else | |
5050 | mddev->recovery_cp = 0; | |
5051 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5052 | mddev->external = 0; |
1da177e4 LT |
5053 | |
5054 | mddev->layout = info->layout; | |
5055 | mddev->chunk_size = info->chunk_size; | |
5056 | ||
5057 | mddev->max_disks = MD_SB_DISKS; | |
5058 | ||
e691063a N |
5059 | if (mddev->persistent) |
5060 | mddev->flags = 0; | |
850b2b42 | 5061 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5062 | |
b2a2703c N |
5063 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
5064 | mddev->bitmap_offset = 0; | |
5065 | ||
f6705578 N |
5066 | mddev->reshape_position = MaxSector; |
5067 | ||
1da177e4 LT |
5068 | /* |
5069 | * Generate a 128 bit UUID | |
5070 | */ | |
5071 | get_random_bytes(mddev->uuid, 16); | |
5072 | ||
f6705578 N |
5073 | mddev->new_level = mddev->level; |
5074 | mddev->new_chunk = mddev->chunk_size; | |
5075 | mddev->new_layout = mddev->layout; | |
5076 | mddev->delta_disks = 0; | |
5077 | ||
1da177e4 LT |
5078 | return 0; |
5079 | } | |
5080 | ||
1f403624 DW |
5081 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5082 | { | |
b522adcd DW |
5083 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5084 | ||
5085 | if (mddev->external_size) | |
5086 | return; | |
5087 | ||
1f403624 DW |
5088 | mddev->array_sectors = array_sectors; |
5089 | } | |
5090 | EXPORT_SYMBOL(md_set_array_sectors); | |
5091 | ||
d71f9f88 | 5092 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5093 | { |
159ec1fc | 5094 | mdk_rdev_t *rdev; |
a35b0d69 | 5095 | int rv; |
d71f9f88 | 5096 | int fit = (num_sectors == 0); |
a35b0d69 N |
5097 | |
5098 | if (mddev->pers->resize == NULL) | |
5099 | return -EINVAL; | |
d71f9f88 AN |
5100 | /* The "num_sectors" is the number of sectors of each device that |
5101 | * is used. This can only make sense for arrays with redundancy. | |
5102 | * linear and raid0 always use whatever space is available. We can only | |
5103 | * consider changing this number if no resync or reconstruction is | |
5104 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5105 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5106 | * of each device. If num_sectors is zero, we find the largest size |
5107 | * that fits. | |
5108 | ||
a35b0d69 N |
5109 | */ |
5110 | if (mddev->sync_thread) | |
5111 | return -EBUSY; | |
dba034ee N |
5112 | if (mddev->bitmap) |
5113 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5114 | * grow, and re-add. | |
5115 | */ | |
5116 | return -EBUSY; | |
159ec1fc | 5117 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5118 | sector_t avail = rdev->sectors; |
01ab5662 | 5119 | |
d71f9f88 AN |
5120 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5121 | num_sectors = avail; | |
5122 | if (avail < num_sectors) | |
a35b0d69 N |
5123 | return -ENOSPC; |
5124 | } | |
d71f9f88 | 5125 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
5126 | if (!rv) { |
5127 | struct block_device *bdev; | |
5128 | ||
5129 | bdev = bdget_disk(mddev->gendisk, 0); | |
5130 | if (bdev) { | |
1b1dcc1b | 5131 | mutex_lock(&bdev->bd_inode->i_mutex); |
f233ea5c AN |
5132 | i_size_write(bdev->bd_inode, |
5133 | (loff_t)mddev->array_sectors << 9); | |
1b1dcc1b | 5134 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
5135 | bdput(bdev); |
5136 | } | |
5137 | } | |
5138 | return rv; | |
5139 | } | |
5140 | ||
da943b99 N |
5141 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5142 | { | |
5143 | int rv; | |
5144 | /* change the number of raid disks */ | |
63c70c4f | 5145 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5146 | return -EINVAL; |
5147 | if (raid_disks <= 0 || | |
5148 | raid_disks >= mddev->max_disks) | |
5149 | return -EINVAL; | |
63c70c4f | 5150 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5151 | return -EBUSY; |
63c70c4f N |
5152 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5153 | ||
5154 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5155 | return rv; |
5156 | } | |
5157 | ||
5158 | ||
1da177e4 LT |
5159 | /* |
5160 | * update_array_info is used to change the configuration of an | |
5161 | * on-line array. | |
5162 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5163 | * fields in the info are checked against the array. | |
5164 | * Any differences that cannot be handled will cause an error. | |
5165 | * Normally, only one change can be managed at a time. | |
5166 | */ | |
5167 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5168 | { | |
5169 | int rv = 0; | |
5170 | int cnt = 0; | |
36fa3063 N |
5171 | int state = 0; |
5172 | ||
5173 | /* calculate expected state,ignoring low bits */ | |
5174 | if (mddev->bitmap && mddev->bitmap_offset) | |
5175 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
5176 | |
5177 | if (mddev->major_version != info->major_version || | |
5178 | mddev->minor_version != info->minor_version || | |
5179 | /* mddev->patch_version != info->patch_version || */ | |
5180 | mddev->ctime != info->ctime || | |
5181 | mddev->level != info->level || | |
5182 | /* mddev->layout != info->layout || */ | |
5183 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
5184 | mddev->chunk_size != info->chunk_size || |
5185 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
5186 | ((state^info->state) & 0xfffffe00) | |
5187 | ) | |
1da177e4 LT |
5188 | return -EINVAL; |
5189 | /* Check there is only one change */ | |
58c0fed4 AN |
5190 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5191 | cnt++; | |
5192 | if (mddev->raid_disks != info->raid_disks) | |
5193 | cnt++; | |
5194 | if (mddev->layout != info->layout) | |
5195 | cnt++; | |
5196 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5197 | cnt++; | |
5198 | if (cnt == 0) | |
5199 | return 0; | |
5200 | if (cnt > 1) | |
5201 | return -EINVAL; | |
1da177e4 LT |
5202 | |
5203 | if (mddev->layout != info->layout) { | |
5204 | /* Change layout | |
5205 | * we don't need to do anything at the md level, the | |
5206 | * personality will take care of it all. | |
5207 | */ | |
5208 | if (mddev->pers->reconfig == NULL) | |
5209 | return -EINVAL; | |
5210 | else | |
5211 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
5212 | } | |
58c0fed4 | 5213 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5214 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5215 | |
da943b99 N |
5216 | if (mddev->raid_disks != info->raid_disks) |
5217 | rv = update_raid_disks(mddev, info->raid_disks); | |
5218 | ||
36fa3063 N |
5219 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5220 | if (mddev->pers->quiesce == NULL) | |
5221 | return -EINVAL; | |
5222 | if (mddev->recovery || mddev->sync_thread) | |
5223 | return -EBUSY; | |
5224 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5225 | /* add the bitmap */ | |
5226 | if (mddev->bitmap) | |
5227 | return -EEXIST; | |
5228 | if (mddev->default_bitmap_offset == 0) | |
5229 | return -EINVAL; | |
5230 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
5231 | mddev->pers->quiesce(mddev, 1); | |
5232 | rv = bitmap_create(mddev); | |
5233 | if (rv) | |
5234 | bitmap_destroy(mddev); | |
5235 | mddev->pers->quiesce(mddev, 0); | |
5236 | } else { | |
5237 | /* remove the bitmap */ | |
5238 | if (!mddev->bitmap) | |
5239 | return -ENOENT; | |
5240 | if (mddev->bitmap->file) | |
5241 | return -EINVAL; | |
5242 | mddev->pers->quiesce(mddev, 1); | |
5243 | bitmap_destroy(mddev); | |
5244 | mddev->pers->quiesce(mddev, 0); | |
5245 | mddev->bitmap_offset = 0; | |
5246 | } | |
5247 | } | |
850b2b42 | 5248 | md_update_sb(mddev, 1); |
1da177e4 LT |
5249 | return rv; |
5250 | } | |
5251 | ||
5252 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5253 | { | |
5254 | mdk_rdev_t *rdev; | |
5255 | ||
5256 | if (mddev->pers == NULL) | |
5257 | return -ENODEV; | |
5258 | ||
5259 | rdev = find_rdev(mddev, dev); | |
5260 | if (!rdev) | |
5261 | return -ENODEV; | |
5262 | ||
5263 | md_error(mddev, rdev); | |
5264 | return 0; | |
5265 | } | |
5266 | ||
2f9618ce AN |
5267 | /* |
5268 | * We have a problem here : there is no easy way to give a CHS | |
5269 | * virtual geometry. We currently pretend that we have a 2 heads | |
5270 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5271 | * dosfs just mad... ;-) | |
5272 | */ | |
a885c8c4 CH |
5273 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5274 | { | |
5275 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5276 | ||
5277 | geo->heads = 2; | |
5278 | geo->sectors = 4; | |
5279 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
5280 | return 0; | |
5281 | } | |
5282 | ||
a39907fa | 5283 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5284 | unsigned int cmd, unsigned long arg) |
5285 | { | |
5286 | int err = 0; | |
5287 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
5288 | mddev_t *mddev = NULL; |
5289 | ||
5290 | if (!capable(CAP_SYS_ADMIN)) | |
5291 | return -EACCES; | |
5292 | ||
5293 | /* | |
5294 | * Commands dealing with the RAID driver but not any | |
5295 | * particular array: | |
5296 | */ | |
5297 | switch (cmd) | |
5298 | { | |
5299 | case RAID_VERSION: | |
5300 | err = get_version(argp); | |
5301 | goto done; | |
5302 | ||
5303 | case PRINT_RAID_DEBUG: | |
5304 | err = 0; | |
5305 | md_print_devices(); | |
5306 | goto done; | |
5307 | ||
5308 | #ifndef MODULE | |
5309 | case RAID_AUTORUN: | |
5310 | err = 0; | |
5311 | autostart_arrays(arg); | |
5312 | goto done; | |
5313 | #endif | |
5314 | default:; | |
5315 | } | |
5316 | ||
5317 | /* | |
5318 | * Commands creating/starting a new array: | |
5319 | */ | |
5320 | ||
a39907fa | 5321 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5322 | |
5323 | if (!mddev) { | |
5324 | BUG(); | |
5325 | goto abort; | |
5326 | } | |
5327 | ||
1da177e4 LT |
5328 | err = mddev_lock(mddev); |
5329 | if (err) { | |
5330 | printk(KERN_INFO | |
5331 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5332 | err, cmd); | |
5333 | goto abort; | |
5334 | } | |
5335 | ||
5336 | switch (cmd) | |
5337 | { | |
5338 | case SET_ARRAY_INFO: | |
5339 | { | |
5340 | mdu_array_info_t info; | |
5341 | if (!arg) | |
5342 | memset(&info, 0, sizeof(info)); | |
5343 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5344 | err = -EFAULT; | |
5345 | goto abort_unlock; | |
5346 | } | |
5347 | if (mddev->pers) { | |
5348 | err = update_array_info(mddev, &info); | |
5349 | if (err) { | |
5350 | printk(KERN_WARNING "md: couldn't update" | |
5351 | " array info. %d\n", err); | |
5352 | goto abort_unlock; | |
5353 | } | |
5354 | goto done_unlock; | |
5355 | } | |
5356 | if (!list_empty(&mddev->disks)) { | |
5357 | printk(KERN_WARNING | |
5358 | "md: array %s already has disks!\n", | |
5359 | mdname(mddev)); | |
5360 | err = -EBUSY; | |
5361 | goto abort_unlock; | |
5362 | } | |
5363 | if (mddev->raid_disks) { | |
5364 | printk(KERN_WARNING | |
5365 | "md: array %s already initialised!\n", | |
5366 | mdname(mddev)); | |
5367 | err = -EBUSY; | |
5368 | goto abort_unlock; | |
5369 | } | |
5370 | err = set_array_info(mddev, &info); | |
5371 | if (err) { | |
5372 | printk(KERN_WARNING "md: couldn't set" | |
5373 | " array info. %d\n", err); | |
5374 | goto abort_unlock; | |
5375 | } | |
5376 | } | |
5377 | goto done_unlock; | |
5378 | ||
5379 | default:; | |
5380 | } | |
5381 | ||
5382 | /* | |
5383 | * Commands querying/configuring an existing array: | |
5384 | */ | |
32a7627c | 5385 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5386 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5387 | if ((!mddev->raid_disks && !mddev->external) |
5388 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5389 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5390 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5391 | err = -ENODEV; |
5392 | goto abort_unlock; | |
5393 | } | |
5394 | ||
5395 | /* | |
5396 | * Commands even a read-only array can execute: | |
5397 | */ | |
5398 | switch (cmd) | |
5399 | { | |
5400 | case GET_ARRAY_INFO: | |
5401 | err = get_array_info(mddev, argp); | |
5402 | goto done_unlock; | |
5403 | ||
32a7627c | 5404 | case GET_BITMAP_FILE: |
87162a28 | 5405 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5406 | goto done_unlock; |
5407 | ||
1da177e4 LT |
5408 | case GET_DISK_INFO: |
5409 | err = get_disk_info(mddev, argp); | |
5410 | goto done_unlock; | |
5411 | ||
5412 | case RESTART_ARRAY_RW: | |
5413 | err = restart_array(mddev); | |
5414 | goto done_unlock; | |
5415 | ||
5416 | case STOP_ARRAY: | |
d710e138 | 5417 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5418 | goto done_unlock; |
5419 | ||
5420 | case STOP_ARRAY_RO: | |
d710e138 | 5421 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
5422 | goto done_unlock; |
5423 | ||
1da177e4 LT |
5424 | } |
5425 | ||
5426 | /* | |
5427 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5428 | * superblock, so we do not allow them on read-only arrays. |
5429 | * However non-MD ioctls (e.g. get-size) will still come through | |
5430 | * here and hit the 'default' below, so only disallow | |
5431 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5432 | */ |
bb57fc64 | 5433 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5434 | if (mddev->ro == 2) { |
5435 | mddev->ro = 0; | |
b62b7590 | 5436 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5437 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5438 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5439 | } else { |
5440 | err = -EROFS; | |
5441 | goto abort_unlock; | |
5442 | } | |
1da177e4 LT |
5443 | } |
5444 | ||
5445 | switch (cmd) | |
5446 | { | |
5447 | case ADD_NEW_DISK: | |
5448 | { | |
5449 | mdu_disk_info_t info; | |
5450 | if (copy_from_user(&info, argp, sizeof(info))) | |
5451 | err = -EFAULT; | |
5452 | else | |
5453 | err = add_new_disk(mddev, &info); | |
5454 | goto done_unlock; | |
5455 | } | |
5456 | ||
5457 | case HOT_REMOVE_DISK: | |
5458 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5459 | goto done_unlock; | |
5460 | ||
5461 | case HOT_ADD_DISK: | |
5462 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5463 | goto done_unlock; | |
5464 | ||
5465 | case SET_DISK_FAULTY: | |
5466 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5467 | goto done_unlock; | |
5468 | ||
5469 | case RUN_ARRAY: | |
d710e138 | 5470 | err = do_md_run(mddev); |
1da177e4 LT |
5471 | goto done_unlock; |
5472 | ||
32a7627c N |
5473 | case SET_BITMAP_FILE: |
5474 | err = set_bitmap_file(mddev, (int)arg); | |
5475 | goto done_unlock; | |
5476 | ||
1da177e4 | 5477 | default: |
1da177e4 LT |
5478 | err = -EINVAL; |
5479 | goto abort_unlock; | |
5480 | } | |
5481 | ||
5482 | done_unlock: | |
5483 | abort_unlock: | |
d3374825 N |
5484 | if (mddev->hold_active == UNTIL_IOCTL && |
5485 | err != -EINVAL) | |
5486 | mddev->hold_active = 0; | |
1da177e4 LT |
5487 | mddev_unlock(mddev); |
5488 | ||
5489 | return err; | |
5490 | done: | |
5491 | if (err) | |
5492 | MD_BUG(); | |
5493 | abort: | |
5494 | return err; | |
5495 | } | |
5496 | ||
a39907fa | 5497 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5498 | { |
5499 | /* | |
5500 | * Succeed if we can lock the mddev, which confirms that | |
5501 | * it isn't being stopped right now. | |
5502 | */ | |
d3374825 | 5503 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5504 | int err; |
5505 | ||
d3374825 N |
5506 | if (mddev->gendisk != bdev->bd_disk) { |
5507 | /* we are racing with mddev_put which is discarding this | |
5508 | * bd_disk. | |
5509 | */ | |
5510 | mddev_put(mddev); | |
5511 | /* Wait until bdev->bd_disk is definitely gone */ | |
5512 | flush_scheduled_work(); | |
5513 | /* Then retry the open from the top */ | |
5514 | return -ERESTARTSYS; | |
5515 | } | |
5516 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5517 | ||
d63a5a74 | 5518 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5519 | goto out; |
5520 | ||
5521 | err = 0; | |
f2ea68cf | 5522 | atomic_inc(&mddev->openers); |
1da177e4 LT |
5523 | mddev_unlock(mddev); |
5524 | ||
a39907fa | 5525 | check_disk_change(bdev); |
1da177e4 LT |
5526 | out: |
5527 | return err; | |
5528 | } | |
5529 | ||
a39907fa | 5530 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5531 | { |
a39907fa | 5532 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5533 | |
52e5f9d1 | 5534 | BUG_ON(!mddev); |
f2ea68cf | 5535 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5536 | mddev_put(mddev); |
5537 | ||
5538 | return 0; | |
5539 | } | |
5540 | ||
44ce6294 LT |
5541 | static int md_media_changed(struct gendisk *disk) |
5542 | { | |
5543 | mddev_t *mddev = disk->private_data; | |
5544 | ||
5545 | return mddev->changed; | |
5546 | } | |
5547 | ||
5548 | static int md_revalidate(struct gendisk *disk) | |
5549 | { | |
5550 | mddev_t *mddev = disk->private_data; | |
5551 | ||
5552 | mddev->changed = 0; | |
5553 | return 0; | |
5554 | } | |
1da177e4 LT |
5555 | static struct block_device_operations md_fops = |
5556 | { | |
5557 | .owner = THIS_MODULE, | |
a39907fa AV |
5558 | .open = md_open, |
5559 | .release = md_release, | |
5560 | .locked_ioctl = md_ioctl, | |
a885c8c4 | 5561 | .getgeo = md_getgeo, |
44ce6294 LT |
5562 | .media_changed = md_media_changed, |
5563 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5564 | }; |
5565 | ||
75c96f85 | 5566 | static int md_thread(void * arg) |
1da177e4 LT |
5567 | { |
5568 | mdk_thread_t *thread = arg; | |
5569 | ||
1da177e4 LT |
5570 | /* |
5571 | * md_thread is a 'system-thread', it's priority should be very | |
5572 | * high. We avoid resource deadlocks individually in each | |
5573 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5574 | * the very same RT priority as kswapd, thus we will never get | |
5575 | * into a priority inversion deadlock. | |
5576 | * | |
5577 | * we definitely have to have equal or higher priority than | |
5578 | * bdflush, otherwise bdflush will deadlock if there are too | |
5579 | * many dirty RAID5 blocks. | |
5580 | */ | |
1da177e4 | 5581 | |
6985c43f | 5582 | allow_signal(SIGKILL); |
a6fb0934 | 5583 | while (!kthread_should_stop()) { |
1da177e4 | 5584 | |
93588e22 N |
5585 | /* We need to wait INTERRUPTIBLE so that |
5586 | * we don't add to the load-average. | |
5587 | * That means we need to be sure no signals are | |
5588 | * pending | |
5589 | */ | |
5590 | if (signal_pending(current)) | |
5591 | flush_signals(current); | |
5592 | ||
5593 | wait_event_interruptible_timeout | |
5594 | (thread->wqueue, | |
5595 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5596 | || kthread_should_stop(), | |
5597 | thread->timeout); | |
1da177e4 LT |
5598 | |
5599 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5600 | ||
787453c2 | 5601 | thread->run(thread->mddev); |
1da177e4 | 5602 | } |
a6fb0934 | 5603 | |
1da177e4 LT |
5604 | return 0; |
5605 | } | |
5606 | ||
5607 | void md_wakeup_thread(mdk_thread_t *thread) | |
5608 | { | |
5609 | if (thread) { | |
5610 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5611 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5612 | wake_up(&thread->wqueue); | |
5613 | } | |
5614 | } | |
5615 | ||
5616 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5617 | const char *name) | |
5618 | { | |
5619 | mdk_thread_t *thread; | |
1da177e4 | 5620 | |
9ffae0cf | 5621 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5622 | if (!thread) |
5623 | return NULL; | |
5624 | ||
1da177e4 LT |
5625 | init_waitqueue_head(&thread->wqueue); |
5626 | ||
1da177e4 LT |
5627 | thread->run = run; |
5628 | thread->mddev = mddev; | |
32a7627c | 5629 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5630 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5631 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5632 | kfree(thread); |
5633 | return NULL; | |
5634 | } | |
1da177e4 LT |
5635 | return thread; |
5636 | } | |
5637 | ||
1da177e4 LT |
5638 | void md_unregister_thread(mdk_thread_t *thread) |
5639 | { | |
e0cf8f04 N |
5640 | if (!thread) |
5641 | return; | |
ba25f9dc | 5642 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5643 | |
5644 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5645 | kfree(thread); |
5646 | } | |
5647 | ||
5648 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5649 | { | |
5650 | if (!mddev) { | |
5651 | MD_BUG(); | |
5652 | return; | |
5653 | } | |
5654 | ||
b2d444d7 | 5655 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5656 | return; |
6bfe0b49 DW |
5657 | |
5658 | if (mddev->external) | |
5659 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5660 | /* |
1da177e4 LT |
5661 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5662 | mdname(mddev), | |
5663 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5664 | __builtin_return_address(0),__builtin_return_address(1), | |
5665 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5666 | */ |
d0a0a5ee AM |
5667 | if (!mddev->pers) |
5668 | return; | |
1da177e4 LT |
5669 | if (!mddev->pers->error_handler) |
5670 | return; | |
5671 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5672 | if (mddev->degraded) |
5673 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5674 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5675 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5676 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5677 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5678 | md_new_event_inintr(mddev); |
1da177e4 LT |
5679 | } |
5680 | ||
5681 | /* seq_file implementation /proc/mdstat */ | |
5682 | ||
5683 | static void status_unused(struct seq_file *seq) | |
5684 | { | |
5685 | int i = 0; | |
5686 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5687 | |
5688 | seq_printf(seq, "unused devices: "); | |
5689 | ||
159ec1fc | 5690 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5691 | char b[BDEVNAME_SIZE]; |
5692 | i++; | |
5693 | seq_printf(seq, "%s ", | |
5694 | bdevname(rdev->bdev,b)); | |
5695 | } | |
5696 | if (!i) | |
5697 | seq_printf(seq, "<none>"); | |
5698 | ||
5699 | seq_printf(seq, "\n"); | |
5700 | } | |
5701 | ||
5702 | ||
5703 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5704 | { | |
dd71cf6b N |
5705 | sector_t max_sectors, resync, res; |
5706 | unsigned long dt, db; | |
5707 | sector_t rt; | |
4588b42e N |
5708 | int scale; |
5709 | unsigned int per_milli; | |
1da177e4 | 5710 | |
dd71cf6b | 5711 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5712 | |
5713 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 5714 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 5715 | else |
dd71cf6b | 5716 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
5717 | |
5718 | /* | |
5719 | * Should not happen. | |
5720 | */ | |
dd71cf6b | 5721 | if (!max_sectors) { |
1da177e4 LT |
5722 | MD_BUG(); |
5723 | return; | |
5724 | } | |
4588b42e | 5725 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 5726 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
5727 | * u32, as those are the requirements for sector_div. |
5728 | * Thus 'scale' must be at least 10 | |
5729 | */ | |
5730 | scale = 10; | |
5731 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 5732 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
5733 | scale++; |
5734 | } | |
5735 | res = (resync>>scale)*1000; | |
dd71cf6b | 5736 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
5737 | |
5738 | per_milli = res; | |
1da177e4 | 5739 | { |
4588b42e | 5740 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5741 | seq_printf(seq, "["); |
5742 | for (i = 0; i < x; i++) | |
5743 | seq_printf(seq, "="); | |
5744 | seq_printf(seq, ">"); | |
5745 | for (i = 0; i < y; i++) | |
5746 | seq_printf(seq, "."); | |
5747 | seq_printf(seq, "] "); | |
5748 | } | |
4588b42e | 5749 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5750 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5751 | "reshape" : | |
61df9d91 N |
5752 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5753 | "check" : | |
5754 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5755 | "resync" : "recovery"))), | |
5756 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
5757 | (unsigned long long) resync/2, |
5758 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
5759 | |
5760 | /* | |
1da177e4 LT |
5761 | * dt: time from mark until now |
5762 | * db: blocks written from mark until now | |
5763 | * rt: remaining time | |
dd71cf6b N |
5764 | * |
5765 | * rt is a sector_t, so could be 32bit or 64bit. | |
5766 | * So we divide before multiply in case it is 32bit and close | |
5767 | * to the limit. | |
5768 | * We scale the divisor (db) by 32 to avoid loosing precision | |
5769 | * near the end of resync when the number of remaining sectors | |
5770 | * is close to 'db'. | |
5771 | * We then divide rt by 32 after multiplying by db to compensate. | |
5772 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
5773 | */ |
5774 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5775 | if (!dt) dt++; | |
ff4e8d9a N |
5776 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5777 | - mddev->resync_mark_cnt; | |
1da177e4 | 5778 | |
dd71cf6b N |
5779 | rt = max_sectors - resync; /* number of remaining sectors */ |
5780 | sector_div(rt, db/32+1); | |
5781 | rt *= dt; | |
5782 | rt >>= 5; | |
5783 | ||
5784 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
5785 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 5786 | |
ff4e8d9a | 5787 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5788 | } |
5789 | ||
5790 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5791 | { | |
5792 | struct list_head *tmp; | |
5793 | loff_t l = *pos; | |
5794 | mddev_t *mddev; | |
5795 | ||
5796 | if (l >= 0x10000) | |
5797 | return NULL; | |
5798 | if (!l--) | |
5799 | /* header */ | |
5800 | return (void*)1; | |
5801 | ||
5802 | spin_lock(&all_mddevs_lock); | |
5803 | list_for_each(tmp,&all_mddevs) | |
5804 | if (!l--) { | |
5805 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5806 | mddev_get(mddev); | |
5807 | spin_unlock(&all_mddevs_lock); | |
5808 | return mddev; | |
5809 | } | |
5810 | spin_unlock(&all_mddevs_lock); | |
5811 | if (!l--) | |
5812 | return (void*)2;/* tail */ | |
5813 | return NULL; | |
5814 | } | |
5815 | ||
5816 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5817 | { | |
5818 | struct list_head *tmp; | |
5819 | mddev_t *next_mddev, *mddev = v; | |
5820 | ||
5821 | ++*pos; | |
5822 | if (v == (void*)2) | |
5823 | return NULL; | |
5824 | ||
5825 | spin_lock(&all_mddevs_lock); | |
5826 | if (v == (void*)1) | |
5827 | tmp = all_mddevs.next; | |
5828 | else | |
5829 | tmp = mddev->all_mddevs.next; | |
5830 | if (tmp != &all_mddevs) | |
5831 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5832 | else { | |
5833 | next_mddev = (void*)2; | |
5834 | *pos = 0x10000; | |
5835 | } | |
5836 | spin_unlock(&all_mddevs_lock); | |
5837 | ||
5838 | if (v != (void*)1) | |
5839 | mddev_put(mddev); | |
5840 | return next_mddev; | |
5841 | ||
5842 | } | |
5843 | ||
5844 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5845 | { | |
5846 | mddev_t *mddev = v; | |
5847 | ||
5848 | if (mddev && v != (void*)1 && v != (void*)2) | |
5849 | mddev_put(mddev); | |
5850 | } | |
5851 | ||
d7603b7e N |
5852 | struct mdstat_info { |
5853 | int event; | |
5854 | }; | |
5855 | ||
1da177e4 LT |
5856 | static int md_seq_show(struct seq_file *seq, void *v) |
5857 | { | |
5858 | mddev_t *mddev = v; | |
dd8ac336 | 5859 | sector_t sectors; |
1da177e4 | 5860 | mdk_rdev_t *rdev; |
d7603b7e | 5861 | struct mdstat_info *mi = seq->private; |
32a7627c | 5862 | struct bitmap *bitmap; |
1da177e4 LT |
5863 | |
5864 | if (v == (void*)1) { | |
2604b703 | 5865 | struct mdk_personality *pers; |
1da177e4 LT |
5866 | seq_printf(seq, "Personalities : "); |
5867 | spin_lock(&pers_lock); | |
2604b703 N |
5868 | list_for_each_entry(pers, &pers_list, list) |
5869 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5870 | |
5871 | spin_unlock(&pers_lock); | |
5872 | seq_printf(seq, "\n"); | |
d7603b7e | 5873 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5874 | return 0; |
5875 | } | |
5876 | if (v == (void*)2) { | |
5877 | status_unused(seq); | |
5878 | return 0; | |
5879 | } | |
5880 | ||
5dc5cf7d | 5881 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5882 | return -EINTR; |
5dc5cf7d | 5883 | |
1da177e4 LT |
5884 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5885 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5886 | mddev->pers ? "" : "in"); | |
5887 | if (mddev->pers) { | |
f91de92e | 5888 | if (mddev->ro==1) |
1da177e4 | 5889 | seq_printf(seq, " (read-only)"); |
f91de92e | 5890 | if (mddev->ro==2) |
52720ae7 | 5891 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5892 | seq_printf(seq, " %s", mddev->pers->name); |
5893 | } | |
5894 | ||
dd8ac336 | 5895 | sectors = 0; |
159ec1fc | 5896 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5897 | char b[BDEVNAME_SIZE]; |
5898 | seq_printf(seq, " %s[%d]", | |
5899 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5900 | if (test_bit(WriteMostly, &rdev->flags)) |
5901 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5902 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5903 | seq_printf(seq, "(F)"); |
5904 | continue; | |
b325a32e N |
5905 | } else if (rdev->raid_disk < 0) |
5906 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 5907 | sectors += rdev->sectors; |
1da177e4 LT |
5908 | } |
5909 | ||
5910 | if (!list_empty(&mddev->disks)) { | |
5911 | if (mddev->pers) | |
5912 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
5913 | (unsigned long long) |
5914 | mddev->array_sectors / 2); | |
1da177e4 LT |
5915 | else |
5916 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 5917 | (unsigned long long)sectors / 2); |
1da177e4 | 5918 | } |
1cd6bf19 N |
5919 | if (mddev->persistent) { |
5920 | if (mddev->major_version != 0 || | |
5921 | mddev->minor_version != 90) { | |
5922 | seq_printf(seq," super %d.%d", | |
5923 | mddev->major_version, | |
5924 | mddev->minor_version); | |
5925 | } | |
e691063a N |
5926 | } else if (mddev->external) |
5927 | seq_printf(seq, " super external:%s", | |
5928 | mddev->metadata_type); | |
5929 | else | |
1cd6bf19 | 5930 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5931 | |
5932 | if (mddev->pers) { | |
d710e138 | 5933 | mddev->pers->status(seq, mddev); |
1da177e4 | 5934 | seq_printf(seq, "\n "); |
8e1b39d6 N |
5935 | if (mddev->pers->sync_request) { |
5936 | if (mddev->curr_resync > 2) { | |
d710e138 | 5937 | status_resync(seq, mddev); |
8e1b39d6 N |
5938 | seq_printf(seq, "\n "); |
5939 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5940 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5941 | else if (mddev->recovery_cp < MaxSector) | |
5942 | seq_printf(seq, "\tresync=PENDING\n "); | |
5943 | } | |
32a7627c N |
5944 | } else |
5945 | seq_printf(seq, "\n "); | |
5946 | ||
5947 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5948 | unsigned long chunk_kb; |
5949 | unsigned long flags; | |
32a7627c N |
5950 | spin_lock_irqsave(&bitmap->lock, flags); |
5951 | chunk_kb = bitmap->chunksize >> 10; | |
5952 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5953 | "%lu%s chunk", | |
5954 | bitmap->pages - bitmap->missing_pages, | |
5955 | bitmap->pages, | |
5956 | (bitmap->pages - bitmap->missing_pages) | |
5957 | << (PAGE_SHIFT - 10), | |
5958 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5959 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5960 | if (bitmap->file) { |
5961 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5962 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5963 | } |
78d742d8 | 5964 | |
32a7627c N |
5965 | seq_printf(seq, "\n"); |
5966 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5967 | } |
5968 | ||
5969 | seq_printf(seq, "\n"); | |
5970 | } | |
5971 | mddev_unlock(mddev); | |
5972 | ||
5973 | return 0; | |
5974 | } | |
5975 | ||
110518bc | 5976 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
5977 | .start = md_seq_start, |
5978 | .next = md_seq_next, | |
5979 | .stop = md_seq_stop, | |
5980 | .show = md_seq_show, | |
5981 | }; | |
5982 | ||
5983 | static int md_seq_open(struct inode *inode, struct file *file) | |
5984 | { | |
5985 | int error; | |
d7603b7e N |
5986 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5987 | if (mi == NULL) | |
5988 | return -ENOMEM; | |
1da177e4 LT |
5989 | |
5990 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5991 | if (error) |
5992 | kfree(mi); | |
5993 | else { | |
5994 | struct seq_file *p = file->private_data; | |
5995 | p->private = mi; | |
5996 | mi->event = atomic_read(&md_event_count); | |
5997 | } | |
1da177e4 LT |
5998 | return error; |
5999 | } | |
6000 | ||
d7603b7e N |
6001 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6002 | { | |
6003 | struct seq_file *m = filp->private_data; | |
6004 | struct mdstat_info *mi = m->private; | |
6005 | int mask; | |
6006 | ||
6007 | poll_wait(filp, &md_event_waiters, wait); | |
6008 | ||
6009 | /* always allow read */ | |
6010 | mask = POLLIN | POLLRDNORM; | |
6011 | ||
6012 | if (mi->event != atomic_read(&md_event_count)) | |
6013 | mask |= POLLERR | POLLPRI; | |
6014 | return mask; | |
6015 | } | |
6016 | ||
fa027c2a | 6017 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6018 | .owner = THIS_MODULE, |
1da177e4 LT |
6019 | .open = md_seq_open, |
6020 | .read = seq_read, | |
6021 | .llseek = seq_lseek, | |
c3f94b40 | 6022 | .release = seq_release_private, |
d7603b7e | 6023 | .poll = mdstat_poll, |
1da177e4 LT |
6024 | }; |
6025 | ||
2604b703 | 6026 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6027 | { |
1da177e4 | 6028 | spin_lock(&pers_lock); |
2604b703 N |
6029 | list_add_tail(&p->list, &pers_list); |
6030 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6031 | spin_unlock(&pers_lock); |
6032 | return 0; | |
6033 | } | |
6034 | ||
2604b703 | 6035 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6036 | { |
2604b703 | 6037 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6038 | spin_lock(&pers_lock); |
2604b703 | 6039 | list_del_init(&p->list); |
1da177e4 LT |
6040 | spin_unlock(&pers_lock); |
6041 | return 0; | |
6042 | } | |
6043 | ||
eea1bf38 | 6044 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6045 | { |
6046 | mdk_rdev_t * rdev; | |
1da177e4 | 6047 | int idle; |
eea1bf38 | 6048 | int curr_events; |
1da177e4 LT |
6049 | |
6050 | idle = 1; | |
4b80991c N |
6051 | rcu_read_lock(); |
6052 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6053 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6054 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6055 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6056 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6057 | /* sync IO will cause sync_io to increase before the disk_stats |
6058 | * as sync_io is counted when a request starts, and | |
6059 | * disk_stats is counted when it completes. | |
6060 | * So resync activity will cause curr_events to be smaller than | |
6061 | * when there was no such activity. | |
6062 | * non-sync IO will cause disk_stat to increase without | |
6063 | * increasing sync_io so curr_events will (eventually) | |
6064 | * be larger than it was before. Once it becomes | |
6065 | * substantially larger, the test below will cause | |
6066 | * the array to appear non-idle, and resync will slow | |
6067 | * down. | |
6068 | * If there is a lot of outstanding resync activity when | |
6069 | * we set last_event to curr_events, then all that activity | |
6070 | * completing might cause the array to appear non-idle | |
6071 | * and resync will be slowed down even though there might | |
6072 | * not have been non-resync activity. This will only | |
6073 | * happen once though. 'last_events' will soon reflect | |
6074 | * the state where there is little or no outstanding | |
6075 | * resync requests, and further resync activity will | |
6076 | * always make curr_events less than last_events. | |
c0e48521 | 6077 | * |
1da177e4 | 6078 | */ |
eea1bf38 | 6079 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6080 | rdev->last_events = curr_events; |
6081 | idle = 0; | |
6082 | } | |
6083 | } | |
4b80991c | 6084 | rcu_read_unlock(); |
1da177e4 LT |
6085 | return idle; |
6086 | } | |
6087 | ||
6088 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6089 | { | |
6090 | /* another "blocks" (512byte) blocks have been synced */ | |
6091 | atomic_sub(blocks, &mddev->recovery_active); | |
6092 | wake_up(&mddev->recovery_wait); | |
6093 | if (!ok) { | |
dfc70645 | 6094 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6095 | md_wakeup_thread(mddev->thread); |
6096 | // stop recovery, signal do_sync .... | |
6097 | } | |
6098 | } | |
6099 | ||
6100 | ||
06d91a5f N |
6101 | /* md_write_start(mddev, bi) |
6102 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6103 | * in superblock) before writing, schedule a superblock update |
6104 | * and wait for it to complete. | |
06d91a5f | 6105 | */ |
3d310eb7 | 6106 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6107 | { |
0fd62b86 | 6108 | int did_change = 0; |
06d91a5f | 6109 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6110 | return; |
06d91a5f | 6111 | |
f91de92e N |
6112 | BUG_ON(mddev->ro == 1); |
6113 | if (mddev->ro == 2) { | |
6114 | /* need to switch to read/write */ | |
6115 | mddev->ro = 0; | |
6116 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6117 | md_wakeup_thread(mddev->thread); | |
25156198 | 6118 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6119 | did_change = 1; |
f91de92e | 6120 | } |
06d91a5f | 6121 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6122 | if (mddev->safemode == 1) |
6123 | mddev->safemode = 0; | |
06d91a5f | 6124 | if (mddev->in_sync) { |
a9701a30 | 6125 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6126 | if (mddev->in_sync) { |
6127 | mddev->in_sync = 0; | |
850b2b42 | 6128 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 6129 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6130 | did_change = 1; |
3d310eb7 | 6131 | } |
a9701a30 | 6132 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6133 | } |
0fd62b86 | 6134 | if (did_change) |
b62b7590 | 6135 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
6136 | wait_event(mddev->sb_wait, |
6137 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
6138 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
6139 | } |
6140 | ||
6141 | void md_write_end(mddev_t *mddev) | |
6142 | { | |
6143 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6144 | if (mddev->safemode == 2) | |
6145 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6146 | else if (mddev->safemode_delay) |
1da177e4 LT |
6147 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6148 | } | |
6149 | } | |
6150 | ||
2a2275d6 N |
6151 | /* md_allow_write(mddev) |
6152 | * Calling this ensures that the array is marked 'active' so that writes | |
6153 | * may proceed without blocking. It is important to call this before | |
6154 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6155 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6156 | * |
6157 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6158 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6159 | */ |
b5470dc5 | 6160 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6161 | { |
6162 | if (!mddev->pers) | |
b5470dc5 | 6163 | return 0; |
2a2275d6 | 6164 | if (mddev->ro) |
b5470dc5 | 6165 | return 0; |
1a0fd497 | 6166 | if (!mddev->pers->sync_request) |
b5470dc5 | 6167 | return 0; |
2a2275d6 N |
6168 | |
6169 | spin_lock_irq(&mddev->write_lock); | |
6170 | if (mddev->in_sync) { | |
6171 | mddev->in_sync = 0; | |
6172 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6173 | if (mddev->safemode_delay && | |
6174 | mddev->safemode == 0) | |
6175 | mddev->safemode = 1; | |
6176 | spin_unlock_irq(&mddev->write_lock); | |
6177 | md_update_sb(mddev, 0); | |
b62b7590 | 6178 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
6179 | } else |
6180 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
6181 | |
6182 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
6183 | return -EAGAIN; | |
6184 | else | |
6185 | return 0; | |
2a2275d6 N |
6186 | } |
6187 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6188 | ||
1da177e4 LT |
6189 | #define SYNC_MARKS 10 |
6190 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6191 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6192 | { |
6193 | mddev_t *mddev2; | |
6194 | unsigned int currspeed = 0, | |
6195 | window; | |
57afd89f | 6196 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6197 | unsigned long mark[SYNC_MARKS]; |
6198 | sector_t mark_cnt[SYNC_MARKS]; | |
6199 | int last_mark,m; | |
6200 | struct list_head *tmp; | |
6201 | sector_t last_check; | |
57afd89f | 6202 | int skipped = 0; |
5fd6c1dc | 6203 | mdk_rdev_t *rdev; |
61df9d91 | 6204 | char *desc; |
1da177e4 LT |
6205 | |
6206 | /* just incase thread restarts... */ | |
6207 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6208 | return; | |
5fd6c1dc N |
6209 | if (mddev->ro) /* never try to sync a read-only array */ |
6210 | return; | |
1da177e4 | 6211 | |
61df9d91 N |
6212 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6213 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6214 | desc = "data-check"; | |
6215 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6216 | desc = "requested-resync"; | |
6217 | else | |
6218 | desc = "resync"; | |
6219 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6220 | desc = "reshape"; | |
6221 | else | |
6222 | desc = "recovery"; | |
6223 | ||
1da177e4 LT |
6224 | /* we overload curr_resync somewhat here. |
6225 | * 0 == not engaged in resync at all | |
6226 | * 2 == checking that there is no conflict with another sync | |
6227 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6228 | * commense | |
6229 | * other == active in resync - this many blocks | |
6230 | * | |
6231 | * Before starting a resync we must have set curr_resync to | |
6232 | * 2, and then checked that every "conflicting" array has curr_resync | |
6233 | * less than ours. When we find one that is the same or higher | |
6234 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6235 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6236 | * This will mean we have to start checking from the beginning again. | |
6237 | * | |
6238 | */ | |
6239 | ||
6240 | do { | |
6241 | mddev->curr_resync = 2; | |
6242 | ||
6243 | try_again: | |
787453c2 | 6244 | if (kthread_should_stop()) { |
6985c43f | 6245 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6246 | goto skip; |
6247 | } | |
29ac4aa3 | 6248 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6249 | if (mddev2 == mddev) |
6250 | continue; | |
90b08710 BS |
6251 | if (!mddev->parallel_resync |
6252 | && mddev2->curr_resync | |
6253 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6254 | DEFINE_WAIT(wq); |
6255 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6256 | /* arbitrarily yield */ | |
6257 | mddev->curr_resync = 1; | |
6258 | wake_up(&resync_wait); | |
6259 | } | |
6260 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6261 | /* no need to wait here, we can wait the next | |
6262 | * time 'round when curr_resync == 2 | |
6263 | */ | |
6264 | continue; | |
9744197c N |
6265 | /* We need to wait 'interruptible' so as not to |
6266 | * contribute to the load average, and not to | |
6267 | * be caught by 'softlockup' | |
6268 | */ | |
6269 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6270 | if (!kthread_should_stop() && |
8712e553 | 6271 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6272 | printk(KERN_INFO "md: delaying %s of %s" |
6273 | " until %s has finished (they" | |
1da177e4 | 6274 | " share one or more physical units)\n", |
61df9d91 | 6275 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6276 | mddev_put(mddev2); |
9744197c N |
6277 | if (signal_pending(current)) |
6278 | flush_signals(current); | |
1da177e4 LT |
6279 | schedule(); |
6280 | finish_wait(&resync_wait, &wq); | |
6281 | goto try_again; | |
6282 | } | |
6283 | finish_wait(&resync_wait, &wq); | |
6284 | } | |
6285 | } | |
6286 | } while (mddev->curr_resync < 2); | |
6287 | ||
5fd6c1dc | 6288 | j = 0; |
9d88883e | 6289 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6290 | /* resync follows the size requested by the personality, |
57afd89f | 6291 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6292 | */ |
6293 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6294 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6295 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6296 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6297 | j = mddev->resync_min; | |
6298 | else if (!mddev->bitmap) | |
5fd6c1dc | 6299 | j = mddev->recovery_cp; |
5e96ee65 | 6300 | |
ccfcc3c1 | 6301 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6302 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6303 | else { |
1da177e4 | 6304 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6305 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6306 | j = MaxSector; |
159ec1fc | 6307 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6308 | if (rdev->raid_disk >= 0 && |
6309 | !test_bit(Faulty, &rdev->flags) && | |
6310 | !test_bit(In_sync, &rdev->flags) && | |
6311 | rdev->recovery_offset < j) | |
6312 | j = rdev->recovery_offset; | |
6313 | } | |
1da177e4 | 6314 | |
61df9d91 N |
6315 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6316 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6317 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6318 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6319 | "(but not more than %d KB/sec) for %s.\n", |
6320 | speed_max(mddev), desc); | |
1da177e4 | 6321 | |
eea1bf38 | 6322 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6323 | |
57afd89f | 6324 | io_sectors = 0; |
1da177e4 LT |
6325 | for (m = 0; m < SYNC_MARKS; m++) { |
6326 | mark[m] = jiffies; | |
57afd89f | 6327 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6328 | } |
6329 | last_mark = 0; | |
6330 | mddev->resync_mark = mark[last_mark]; | |
6331 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6332 | ||
6333 | /* | |
6334 | * Tune reconstruction: | |
6335 | */ | |
6336 | window = 32*(PAGE_SIZE/512); | |
6337 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6338 | window/2,(unsigned long long) max_sectors/2); | |
6339 | ||
6340 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6341 | last_check = 0; |
6342 | ||
6343 | if (j>2) { | |
6344 | printk(KERN_INFO | |
61df9d91 N |
6345 | "md: resuming %s of %s from checkpoint.\n", |
6346 | desc, mdname(mddev)); | |
1da177e4 LT |
6347 | mddev->curr_resync = j; |
6348 | } | |
6349 | ||
6350 | while (j < max_sectors) { | |
57afd89f | 6351 | sector_t sectors; |
1da177e4 | 6352 | |
57afd89f | 6353 | skipped = 0; |
97e4f42d | 6354 | |
acb180b0 N |
6355 | if ((mddev->curr_resync > mddev->curr_resync_completed && |
6356 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6357 | > (max_sectors >> 4)) || | |
c03f6a19 N |
6358 | (j - mddev->curr_resync_completed)*2 |
6359 | >= mddev->resync_max - mddev->curr_resync_completed | |
acb180b0 | 6360 | ) { |
97e4f42d N |
6361 | /* time to update curr_resync_completed */ |
6362 | blk_unplug(mddev->queue); | |
6363 | wait_event(mddev->recovery_wait, | |
6364 | atomic_read(&mddev->recovery_active) == 0); | |
6365 | mddev->curr_resync_completed = | |
6366 | mddev->curr_resync; | |
6367 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
acb180b0 | 6368 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6369 | } |
acb180b0 N |
6370 | |
6371 | if (j >= mddev->resync_max) | |
6372 | wait_event(mddev->recovery_wait, | |
6373 | mddev->resync_max > j | |
6374 | || kthread_should_stop()); | |
6375 | ||
6376 | if (kthread_should_stop()) | |
6377 | goto interrupted; | |
6378 | ||
57afd89f | 6379 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6380 | currspeed < speed_min(mddev)); |
57afd89f | 6381 | if (sectors == 0) { |
dfc70645 | 6382 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6383 | goto out; |
6384 | } | |
57afd89f N |
6385 | |
6386 | if (!skipped) { /* actual IO requested */ | |
6387 | io_sectors += sectors; | |
6388 | atomic_add(sectors, &mddev->recovery_active); | |
6389 | } | |
6390 | ||
1da177e4 LT |
6391 | j += sectors; |
6392 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6393 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6394 | if (last_check == 0) |
6395 | /* this is the earliers that rebuilt will be | |
6396 | * visible in /proc/mdstat | |
6397 | */ | |
6398 | md_new_event(mddev); | |
57afd89f N |
6399 | |
6400 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6401 | continue; |
6402 | ||
57afd89f | 6403 | last_check = io_sectors; |
1da177e4 | 6404 | |
dfc70645 | 6405 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6406 | break; |
6407 | ||
6408 | repeat: | |
6409 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6410 | /* step marks */ | |
6411 | int next = (last_mark+1) % SYNC_MARKS; | |
6412 | ||
6413 | mddev->resync_mark = mark[next]; | |
6414 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6415 | mark[next] = jiffies; | |
57afd89f | 6416 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6417 | last_mark = next; |
6418 | } | |
6419 | ||
6420 | ||
c6207277 N |
6421 | if (kthread_should_stop()) |
6422 | goto interrupted; | |
6423 | ||
1da177e4 LT |
6424 | |
6425 | /* | |
6426 | * this loop exits only if either when we are slower than | |
6427 | * the 'hard' speed limit, or the system was IO-idle for | |
6428 | * a jiffy. | |
6429 | * the system might be non-idle CPU-wise, but we only care | |
6430 | * about not overloading the IO subsystem. (things like an | |
6431 | * e2fsck being done on the RAID array should execute fast) | |
6432 | */ | |
2ad8b1ef | 6433 | blk_unplug(mddev->queue); |
1da177e4 LT |
6434 | cond_resched(); |
6435 | ||
57afd89f N |
6436 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6437 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6438 | |
88202a0c N |
6439 | if (currspeed > speed_min(mddev)) { |
6440 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6441 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6442 | msleep(500); |
1da177e4 LT |
6443 | goto repeat; |
6444 | } | |
6445 | } | |
6446 | } | |
61df9d91 | 6447 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6448 | /* |
6449 | * this also signals 'finished resyncing' to md_stop | |
6450 | */ | |
6451 | out: | |
2ad8b1ef | 6452 | blk_unplug(mddev->queue); |
1da177e4 LT |
6453 | |
6454 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6455 | ||
6456 | /* tell personality that we are finished */ | |
57afd89f | 6457 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6458 | |
dfc70645 | 6459 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6460 | mddev->curr_resync > 2) { |
6461 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6462 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6463 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6464 | printk(KERN_INFO | |
61df9d91 N |
6465 | "md: checkpointing %s of %s.\n", |
6466 | desc, mdname(mddev)); | |
5fd6c1dc N |
6467 | mddev->recovery_cp = mddev->curr_resync; |
6468 | } | |
6469 | } else | |
6470 | mddev->recovery_cp = MaxSector; | |
6471 | } else { | |
6472 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6473 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6474 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6475 | if (rdev->raid_disk >= 0 && |
6476 | !test_bit(Faulty, &rdev->flags) && | |
6477 | !test_bit(In_sync, &rdev->flags) && | |
6478 | rdev->recovery_offset < mddev->curr_resync) | |
6479 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6480 | } |
1da177e4 | 6481 | } |
17571284 | 6482 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6483 | |
1da177e4 LT |
6484 | skip: |
6485 | mddev->curr_resync = 0; | |
acb180b0 | 6486 | mddev->curr_resync_completed = 0; |
5e96ee65 | 6487 | mddev->resync_min = 0; |
c6207277 N |
6488 | mddev->resync_max = MaxSector; |
6489 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
6490 | wake_up(&resync_wait); |
6491 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6492 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6493 | return; |
6494 | ||
6495 | interrupted: | |
6496 | /* | |
6497 | * got a signal, exit. | |
6498 | */ | |
6499 | printk(KERN_INFO | |
6500 | "md: md_do_sync() got signal ... exiting\n"); | |
6501 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6502 | goto out; | |
6503 | ||
1da177e4 | 6504 | } |
29269553 | 6505 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6506 | |
6507 | ||
b4c4c7b8 N |
6508 | static int remove_and_add_spares(mddev_t *mddev) |
6509 | { | |
6510 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6511 | int spares = 0; |
6512 | ||
97e4f42d N |
6513 | mddev->curr_resync_completed = 0; |
6514 | ||
159ec1fc | 6515 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6516 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6517 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6518 | (test_bit(Faulty, &rdev->flags) || |
6519 | ! test_bit(In_sync, &rdev->flags)) && | |
6520 | atomic_read(&rdev->nr_pending)==0) { | |
6521 | if (mddev->pers->hot_remove_disk( | |
6522 | mddev, rdev->raid_disk)==0) { | |
6523 | char nm[20]; | |
6524 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6525 | sysfs_remove_link(&mddev->kobj, nm); | |
6526 | rdev->raid_disk = -1; | |
6527 | } | |
6528 | } | |
6529 | ||
4044ba58 | 6530 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6531 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6532 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6533 | !test_bit(In_sync, &rdev->flags) && |
6534 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6535 | spares++; |
b4c4c7b8 N |
6536 | if (rdev->raid_disk < 0 |
6537 | && !test_bit(Faulty, &rdev->flags)) { | |
6538 | rdev->recovery_offset = 0; | |
199050ea NB |
6539 | if (mddev->pers-> |
6540 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6541 | char nm[20]; |
6542 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6543 | if (sysfs_create_link(&mddev->kobj, |
6544 | &rdev->kobj, nm)) | |
6545 | printk(KERN_WARNING | |
6546 | "md: cannot register " | |
6547 | "%s for %s\n", | |
6548 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6549 | spares++; |
6550 | md_new_event(mddev); | |
6551 | } else | |
6552 | break; | |
6553 | } | |
dfc70645 | 6554 | } |
b4c4c7b8 N |
6555 | } |
6556 | return spares; | |
6557 | } | |
1da177e4 LT |
6558 | /* |
6559 | * This routine is regularly called by all per-raid-array threads to | |
6560 | * deal with generic issues like resync and super-block update. | |
6561 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6562 | * need this as they never do any recovery or update the superblock. | |
6563 | * | |
6564 | * It does not do any resync itself, but rather "forks" off other threads | |
6565 | * to do that as needed. | |
6566 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6567 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6568 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6569 | * and wakeups up this thread which will reap the thread and finish up. |
6570 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6571 | * | |
6572 | * The overall approach is: | |
6573 | * 1/ if the superblock needs updating, update it. | |
6574 | * 2/ If a recovery thread is running, don't do anything else. | |
6575 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6576 | * 4/ If there are any faulty devices, remove them. | |
6577 | * 5/ If array is degraded, try to add spares devices | |
6578 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6579 | */ | |
6580 | void md_check_recovery(mddev_t *mddev) | |
6581 | { | |
6582 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6583 | |
6584 | ||
5f40402d N |
6585 | if (mddev->bitmap) |
6586 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
6587 | |
6588 | if (mddev->ro) | |
6589 | return; | |
fca4d848 N |
6590 | |
6591 | if (signal_pending(current)) { | |
31a59e34 | 6592 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6593 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6594 | mdname(mddev)); | |
6595 | mddev->safemode = 2; | |
6596 | } | |
6597 | flush_signals(current); | |
6598 | } | |
6599 | ||
c89a8eee N |
6600 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6601 | return; | |
1da177e4 | 6602 | if ( ! ( |
e691063a | 6603 | (mddev->flags && !mddev->external) || |
1da177e4 | 6604 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6605 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6606 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6607 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6608 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6609 | )) |
6610 | return; | |
fca4d848 | 6611 | |
df5b89b3 | 6612 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6613 | int spares = 0; |
fca4d848 | 6614 | |
c89a8eee N |
6615 | if (mddev->ro) { |
6616 | /* Only thing we do on a ro array is remove | |
6617 | * failed devices. | |
6618 | */ | |
6619 | remove_and_add_spares(mddev); | |
6620 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6621 | goto unlock; | |
6622 | } | |
6623 | ||
31a59e34 | 6624 | if (!mddev->external) { |
0fd62b86 | 6625 | int did_change = 0; |
31a59e34 N |
6626 | spin_lock_irq(&mddev->write_lock); |
6627 | if (mddev->safemode && | |
6628 | !atomic_read(&mddev->writes_pending) && | |
6629 | !mddev->in_sync && | |
6630 | mddev->recovery_cp == MaxSector) { | |
6631 | mddev->in_sync = 1; | |
0fd62b86 | 6632 | did_change = 1; |
31a59e34 N |
6633 | if (mddev->persistent) |
6634 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6635 | } | |
6636 | if (mddev->safemode == 1) | |
6637 | mddev->safemode = 0; | |
6638 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6639 | if (did_change) |
b62b7590 | 6640 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6641 | } |
fca4d848 | 6642 | |
850b2b42 N |
6643 | if (mddev->flags) |
6644 | md_update_sb(mddev, 0); | |
06d91a5f | 6645 | |
159ec1fc | 6646 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6647 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6648 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6649 | |
06d91a5f | 6650 | |
1da177e4 LT |
6651 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6652 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6653 | /* resync/recovery still happening */ | |
6654 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6655 | goto unlock; | |
6656 | } | |
6657 | if (mddev->sync_thread) { | |
6658 | /* resync has finished, collect result */ | |
6659 | md_unregister_thread(mddev->sync_thread); | |
6660 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6661 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6662 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6663 | /* success...*/ |
6664 | /* activate any spares */ | |
a99ac971 NB |
6665 | if (mddev->pers->spare_active(mddev)) |
6666 | sysfs_notify(&mddev->kobj, NULL, | |
6667 | "degraded"); | |
1da177e4 | 6668 | } |
cea9c228 N |
6669 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6670 | mddev->pers->finish_reshape) | |
6671 | mddev->pers->finish_reshape(mddev); | |
850b2b42 | 6672 | md_update_sb(mddev, 1); |
41158c7e N |
6673 | |
6674 | /* if array is no-longer degraded, then any saved_raid_disk | |
6675 | * information must be scrapped | |
6676 | */ | |
6677 | if (!mddev->degraded) | |
159ec1fc | 6678 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6679 | rdev->saved_raid_disk = -1; |
6680 | ||
1da177e4 LT |
6681 | mddev->recovery = 0; |
6682 | /* flag recovery needed just to double check */ | |
6683 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6684 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6685 | md_new_event(mddev); |
1da177e4 LT |
6686 | goto unlock; |
6687 | } | |
72a23c21 NB |
6688 | /* Set RUNNING before clearing NEEDED to avoid |
6689 | * any transients in the value of "sync_action". | |
6690 | */ | |
6691 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6692 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6693 | /* Clear some bits that don't mean anything, but |
6694 | * might be left set | |
6695 | */ | |
24dd469d N |
6696 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6697 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6698 | |
5fd6c1dc N |
6699 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6700 | goto unlock; | |
1da177e4 LT |
6701 | /* no recovery is running. |
6702 | * remove any failed drives, then | |
6703 | * add spares if possible. | |
6704 | * Spare are also removed and re-added, to allow | |
6705 | * the personality to fail the re-add. | |
6706 | */ | |
1da177e4 | 6707 | |
b4c4c7b8 N |
6708 | if (mddev->reshape_position != MaxSector) { |
6709 | if (mddev->pers->check_reshape(mddev) != 0) | |
6710 | /* Cannot proceed */ | |
6711 | goto unlock; | |
6712 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6713 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6714 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6715 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6716 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6717 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6718 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6719 | } else if (mddev->recovery_cp < MaxSector) { |
6720 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6721 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6722 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6723 | /* nothing to be done ... */ | |
1da177e4 | 6724 | goto unlock; |
24dd469d | 6725 | |
1da177e4 | 6726 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6727 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6728 | /* We are adding a device or devices to an array | |
6729 | * which has the bitmap stored on all devices. | |
6730 | * So make sure all bitmap pages get written | |
6731 | */ | |
6732 | bitmap_write_all(mddev->bitmap); | |
6733 | } | |
1da177e4 LT |
6734 | mddev->sync_thread = md_register_thread(md_do_sync, |
6735 | mddev, | |
6736 | "%s_resync"); | |
6737 | if (!mddev->sync_thread) { | |
6738 | printk(KERN_ERR "%s: could not start resync" | |
6739 | " thread...\n", | |
6740 | mdname(mddev)); | |
6741 | /* leave the spares where they are, it shouldn't hurt */ | |
6742 | mddev->recovery = 0; | |
d7603b7e | 6743 | } else |
1da177e4 | 6744 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6745 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6746 | md_new_event(mddev); |
1da177e4 LT |
6747 | } |
6748 | unlock: | |
72a23c21 NB |
6749 | if (!mddev->sync_thread) { |
6750 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6751 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6752 | &mddev->recovery)) | |
0c3573f1 N |
6753 | if (mddev->sysfs_action) |
6754 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6755 | } |
1da177e4 LT |
6756 | mddev_unlock(mddev); |
6757 | } | |
6758 | } | |
6759 | ||
6bfe0b49 DW |
6760 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6761 | { | |
3c0ee63a | 6762 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
6763 | wait_event_timeout(rdev->blocked_wait, |
6764 | !test_bit(Blocked, &rdev->flags), | |
6765 | msecs_to_jiffies(5000)); | |
6766 | rdev_dec_pending(rdev, mddev); | |
6767 | } | |
6768 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6769 | ||
75c96f85 AB |
6770 | static int md_notify_reboot(struct notifier_block *this, |
6771 | unsigned long code, void *x) | |
1da177e4 LT |
6772 | { |
6773 | struct list_head *tmp; | |
6774 | mddev_t *mddev; | |
6775 | ||
6776 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6777 | ||
6778 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6779 | ||
29ac4aa3 | 6780 | for_each_mddev(mddev, tmp) |
c71d4887 | 6781 | if (mddev_trylock(mddev)) { |
2b25000b N |
6782 | /* Force a switch to readonly even array |
6783 | * appears to still be in use. Hence | |
6784 | * the '100'. | |
6785 | */ | |
d710e138 | 6786 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
6787 | mddev_unlock(mddev); |
6788 | } | |
1da177e4 LT |
6789 | /* |
6790 | * certain more exotic SCSI devices are known to be | |
6791 | * volatile wrt too early system reboots. While the | |
6792 | * right place to handle this issue is the given | |
6793 | * driver, we do want to have a safe RAID driver ... | |
6794 | */ | |
6795 | mdelay(1000*1); | |
6796 | } | |
6797 | return NOTIFY_DONE; | |
6798 | } | |
6799 | ||
75c96f85 | 6800 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6801 | .notifier_call = md_notify_reboot, |
6802 | .next = NULL, | |
6803 | .priority = INT_MAX, /* before any real devices */ | |
6804 | }; | |
6805 | ||
6806 | static void md_geninit(void) | |
6807 | { | |
1da177e4 LT |
6808 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6809 | ||
c7705f34 | 6810 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6811 | } |
6812 | ||
75c96f85 | 6813 | static int __init md_init(void) |
1da177e4 | 6814 | { |
3dbd8c2e | 6815 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
6816 | return -1; |
6817 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 6818 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
6819 | return -1; |
6820 | } | |
3dbd8c2e | 6821 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
6822 | md_probe, NULL, NULL); |
6823 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6824 | md_probe, NULL, NULL); |
6825 | ||
1da177e4 | 6826 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6827 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6828 | |
6829 | md_geninit(); | |
d710e138 | 6830 | return 0; |
1da177e4 LT |
6831 | } |
6832 | ||
6833 | ||
6834 | #ifndef MODULE | |
6835 | ||
6836 | /* | |
6837 | * Searches all registered partitions for autorun RAID arrays | |
6838 | * at boot time. | |
6839 | */ | |
4d936ec1 ME |
6840 | |
6841 | static LIST_HEAD(all_detected_devices); | |
6842 | struct detected_devices_node { | |
6843 | struct list_head list; | |
6844 | dev_t dev; | |
6845 | }; | |
1da177e4 LT |
6846 | |
6847 | void md_autodetect_dev(dev_t dev) | |
6848 | { | |
4d936ec1 ME |
6849 | struct detected_devices_node *node_detected_dev; |
6850 | ||
6851 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6852 | if (node_detected_dev) { | |
6853 | node_detected_dev->dev = dev; | |
6854 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6855 | } else { | |
6856 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6857 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6858 | } | |
1da177e4 LT |
6859 | } |
6860 | ||
6861 | ||
6862 | static void autostart_arrays(int part) | |
6863 | { | |
6864 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6865 | struct detected_devices_node *node_detected_dev; |
6866 | dev_t dev; | |
6867 | int i_scanned, i_passed; | |
1da177e4 | 6868 | |
4d936ec1 ME |
6869 | i_scanned = 0; |
6870 | i_passed = 0; | |
1da177e4 | 6871 | |
4d936ec1 | 6872 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6873 | |
4d936ec1 ME |
6874 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6875 | i_scanned++; | |
6876 | node_detected_dev = list_entry(all_detected_devices.next, | |
6877 | struct detected_devices_node, list); | |
6878 | list_del(&node_detected_dev->list); | |
6879 | dev = node_detected_dev->dev; | |
6880 | kfree(node_detected_dev); | |
df968c4e | 6881 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6882 | if (IS_ERR(rdev)) |
6883 | continue; | |
6884 | ||
b2d444d7 | 6885 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6886 | MD_BUG(); |
6887 | continue; | |
6888 | } | |
d0fae18f | 6889 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6890 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6891 | i_passed++; |
1da177e4 | 6892 | } |
4d936ec1 ME |
6893 | |
6894 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6895 | i_scanned, i_passed); | |
1da177e4 LT |
6896 | |
6897 | autorun_devices(part); | |
6898 | } | |
6899 | ||
fdee8ae4 | 6900 | #endif /* !MODULE */ |
1da177e4 LT |
6901 | |
6902 | static __exit void md_exit(void) | |
6903 | { | |
6904 | mddev_t *mddev; | |
6905 | struct list_head *tmp; | |
8ab5e4c1 | 6906 | |
3dbd8c2e | 6907 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 6908 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 6909 | |
3dbd8c2e | 6910 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
6911 | unregister_blkdev(mdp_major, "mdp"); |
6912 | unregister_reboot_notifier(&md_notifier); | |
6913 | unregister_sysctl_table(raid_table_header); | |
6914 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6915 | for_each_mddev(mddev, tmp) { |
1da177e4 | 6916 | export_array(mddev); |
d3374825 | 6917 | mddev->hold_active = 0; |
1da177e4 LT |
6918 | } |
6919 | } | |
6920 | ||
685784aa | 6921 | subsys_initcall(md_init); |
1da177e4 LT |
6922 | module_exit(md_exit) |
6923 | ||
f91de92e N |
6924 | static int get_ro(char *buffer, struct kernel_param *kp) |
6925 | { | |
6926 | return sprintf(buffer, "%d", start_readonly); | |
6927 | } | |
6928 | static int set_ro(const char *val, struct kernel_param *kp) | |
6929 | { | |
6930 | char *e; | |
6931 | int num = simple_strtoul(val, &e, 10); | |
6932 | if (*val && (*e == '\0' || *e == '\n')) { | |
6933 | start_readonly = num; | |
4dbcdc75 | 6934 | return 0; |
f91de92e N |
6935 | } |
6936 | return -EINVAL; | |
6937 | } | |
6938 | ||
80ca3a44 N |
6939 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6940 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6941 | |
efeb53c0 | 6942 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 6943 | |
1da177e4 LT |
6944 | EXPORT_SYMBOL(register_md_personality); |
6945 | EXPORT_SYMBOL(unregister_md_personality); | |
6946 | EXPORT_SYMBOL(md_error); | |
6947 | EXPORT_SYMBOL(md_done_sync); | |
6948 | EXPORT_SYMBOL(md_write_start); | |
6949 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6950 | EXPORT_SYMBOL(md_register_thread); |
6951 | EXPORT_SYMBOL(md_unregister_thread); | |
6952 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6953 | EXPORT_SYMBOL(md_check_recovery); |
6954 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6955 | MODULE_ALIAS("md"); |
72008652 | 6956 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |