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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" |
32a7627c | 52 | |
1da177e4 LT |
53 | #define DEBUG 0 |
54 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
55 | ||
56 | ||
57 | #ifndef MODULE | |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
2604b703 | 61 | static LIST_HEAD(pers_list); |
1da177e4 LT |
62 | static DEFINE_SPINLOCK(pers_lock); |
63 | ||
5e56341d AB |
64 | static void md_print_devices(void); |
65 | ||
90b08710 BS |
66 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
67 | ||
5e56341d AB |
68 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
69 | ||
1da177e4 LT |
70 | /* |
71 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
72 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
73 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 74 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
75 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
76 | * speed limit - in case reconstruction slows down your system despite | |
77 | * idle IO detection. | |
78 | * | |
79 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 80 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
81 | */ |
82 | ||
83 | static int sysctl_speed_limit_min = 1000; | |
84 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
85 | static inline int speed_min(mddev_t *mddev) |
86 | { | |
87 | return mddev->sync_speed_min ? | |
88 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
89 | } | |
90 | ||
91 | static inline int speed_max(mddev_t *mddev) | |
92 | { | |
93 | return mddev->sync_speed_max ? | |
94 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
95 | } | |
1da177e4 LT |
96 | |
97 | static struct ctl_table_header *raid_table_header; | |
98 | ||
99 | static ctl_table raid_table[] = { | |
100 | { | |
101 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
102 | .procname = "speed_limit_min", | |
103 | .data = &sysctl_speed_limit_min, | |
104 | .maxlen = sizeof(int), | |
80ca3a44 | 105 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
106 | .proc_handler = &proc_dointvec, |
107 | }, | |
108 | { | |
109 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
110 | .procname = "speed_limit_max", | |
111 | .data = &sysctl_speed_limit_max, | |
112 | .maxlen = sizeof(int), | |
80ca3a44 | 113 | .mode = S_IRUGO|S_IWUSR, |
1da177e4 LT |
114 | .proc_handler = &proc_dointvec, |
115 | }, | |
116 | { .ctl_name = 0 } | |
117 | }; | |
118 | ||
119 | static ctl_table raid_dir_table[] = { | |
120 | { | |
121 | .ctl_name = DEV_RAID, | |
122 | .procname = "raid", | |
123 | .maxlen = 0, | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
125 | .child = raid_table, |
126 | }, | |
127 | { .ctl_name = 0 } | |
128 | }; | |
129 | ||
130 | static ctl_table raid_root_table[] = { | |
131 | { | |
132 | .ctl_name = CTL_DEV, | |
133 | .procname = "dev", | |
134 | .maxlen = 0, | |
135 | .mode = 0555, | |
136 | .child = raid_dir_table, | |
137 | }, | |
138 | { .ctl_name = 0 } | |
139 | }; | |
140 | ||
141 | static struct block_device_operations md_fops; | |
142 | ||
f91de92e N |
143 | static int start_readonly; |
144 | ||
d7603b7e N |
145 | /* |
146 | * We have a system wide 'event count' that is incremented | |
147 | * on any 'interesting' event, and readers of /proc/mdstat | |
148 | * can use 'poll' or 'select' to find out when the event | |
149 | * count increases. | |
150 | * | |
151 | * Events are: | |
152 | * start array, stop array, error, add device, remove device, | |
153 | * start build, activate spare | |
154 | */ | |
2989ddbd | 155 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 156 | static atomic_t md_event_count; |
29269553 | 157 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
158 | { |
159 | atomic_inc(&md_event_count); | |
160 | wake_up(&md_event_waiters); | |
161 | } | |
29269553 | 162 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 163 | |
c331eb04 N |
164 | /* Alternate version that can be called from interrupts |
165 | * when calling sysfs_notify isn't needed. | |
166 | */ | |
05381954 | 167 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
168 | { |
169 | atomic_inc(&md_event_count); | |
170 | wake_up(&md_event_waiters); | |
171 | } | |
172 | ||
1da177e4 LT |
173 | /* |
174 | * Enables to iterate over all existing md arrays | |
175 | * all_mddevs_lock protects this list. | |
176 | */ | |
177 | static LIST_HEAD(all_mddevs); | |
178 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
179 | ||
180 | ||
181 | /* | |
182 | * iterates through all used mddevs in the system. | |
183 | * We take care to grab the all_mddevs_lock whenever navigating | |
184 | * the list, and to always hold a refcount when unlocked. | |
185 | * Any code which breaks out of this loop while own | |
186 | * a reference to the current mddev and must mddev_put it. | |
187 | */ | |
29ac4aa3 | 188 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
189 | \ |
190 | for (({ spin_lock(&all_mddevs_lock); \ | |
191 | tmp = all_mddevs.next; \ | |
192 | mddev = NULL;}); \ | |
193 | ({ if (tmp != &all_mddevs) \ | |
194 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
195 | spin_unlock(&all_mddevs_lock); \ | |
196 | if (mddev) mddev_put(mddev); \ | |
197 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
198 | tmp != &all_mddevs;}); \ | |
199 | ({ spin_lock(&all_mddevs_lock); \ | |
200 | tmp = tmp->next;}) \ | |
201 | ) | |
202 | ||
203 | ||
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 | ||
d3374825 N |
272 | static void mddev_delayed_delete(struct work_struct *ws) |
273 | { | |
274 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
275 | kobject_del(&mddev->kobj); | |
276 | kobject_put(&mddev->kobj); | |
277 | } | |
278 | ||
1da177e4 LT |
279 | static void mddev_put(mddev_t *mddev) |
280 | { | |
281 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
282 | return; | |
d3374825 N |
283 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
284 | !mddev->hold_active) { | |
1da177e4 | 285 | list_del(&mddev->all_mddevs); |
d3374825 N |
286 | if (mddev->gendisk) { |
287 | /* we did a probe so need to clean up. | |
288 | * Call schedule_work inside the spinlock | |
289 | * so that flush_scheduled_work() after | |
290 | * mddev_find will succeed in waiting for the | |
291 | * work to be done. | |
292 | */ | |
293 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
294 | schedule_work(&mddev->del_work); | |
295 | } else | |
296 | kfree(mddev); | |
297 | } | |
298 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
299 | } |
300 | ||
301 | static mddev_t * mddev_find(dev_t unit) | |
302 | { | |
303 | mddev_t *mddev, *new = NULL; | |
304 | ||
305 | retry: | |
306 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
307 | |
308 | if (unit) { | |
309 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
310 | if (mddev->unit == unit) { | |
311 | mddev_get(mddev); | |
312 | spin_unlock(&all_mddevs_lock); | |
313 | kfree(new); | |
314 | return mddev; | |
315 | } | |
316 | ||
317 | if (new) { | |
318 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 319 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
320 | new->hold_active = UNTIL_IOCTL; |
321 | return new; | |
1da177e4 | 322 | } |
efeb53c0 N |
323 | } else if (new) { |
324 | /* find an unused unit number */ | |
325 | static int next_minor = 512; | |
326 | int start = next_minor; | |
327 | int is_free = 0; | |
328 | int dev = 0; | |
329 | while (!is_free) { | |
330 | dev = MKDEV(MD_MAJOR, next_minor); | |
331 | next_minor++; | |
332 | if (next_minor > MINORMASK) | |
333 | next_minor = 0; | |
334 | if (next_minor == start) { | |
335 | /* Oh dear, all in use. */ | |
336 | spin_unlock(&all_mddevs_lock); | |
337 | kfree(new); | |
338 | return NULL; | |
339 | } | |
340 | ||
341 | is_free = 1; | |
342 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
343 | if (mddev->unit == dev) { | |
344 | is_free = 0; | |
345 | break; | |
346 | } | |
347 | } | |
348 | new->unit = dev; | |
349 | new->md_minor = MINOR(dev); | |
350 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
351 | list_add(&new->all_mddevs, &all_mddevs); |
352 | spin_unlock(&all_mddevs_lock); | |
353 | return new; | |
354 | } | |
355 | spin_unlock(&all_mddevs_lock); | |
356 | ||
9ffae0cf | 357 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
358 | if (!new) |
359 | return NULL; | |
360 | ||
1da177e4 LT |
361 | new->unit = unit; |
362 | if (MAJOR(unit) == MD_MAJOR) | |
363 | new->md_minor = MINOR(unit); | |
364 | else | |
365 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
366 | ||
df5b89b3 | 367 | mutex_init(&new->reconfig_mutex); |
1da177e4 LT |
368 | INIT_LIST_HEAD(&new->disks); |
369 | INIT_LIST_HEAD(&new->all_mddevs); | |
370 | init_timer(&new->safemode_timer); | |
371 | atomic_set(&new->active, 1); | |
f2ea68cf | 372 | atomic_set(&new->openers, 0); |
409c57f3 | 373 | atomic_set(&new->active_io, 0); |
06d91a5f | 374 | spin_lock_init(&new->write_lock); |
3d310eb7 | 375 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 376 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 377 | new->reshape_position = MaxSector; |
5e96ee65 | 378 | new->resync_min = 0; |
c6207277 | 379 | new->resync_max = MaxSector; |
d897dbf9 | 380 | new->level = LEVEL_NONE; |
1da177e4 | 381 | |
1da177e4 LT |
382 | goto retry; |
383 | } | |
384 | ||
385 | static inline int mddev_lock(mddev_t * mddev) | |
386 | { | |
df5b89b3 | 387 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
388 | } |
389 | ||
b522adcd DW |
390 | static inline int mddev_is_locked(mddev_t *mddev) |
391 | { | |
392 | return mutex_is_locked(&mddev->reconfig_mutex); | |
393 | } | |
394 | ||
1da177e4 LT |
395 | static inline int mddev_trylock(mddev_t * mddev) |
396 | { | |
df5b89b3 | 397 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
398 | } |
399 | ||
400 | static inline void mddev_unlock(mddev_t * mddev) | |
401 | { | |
df5b89b3 | 402 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 403 | |
005eca5e | 404 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
405 | } |
406 | ||
2989ddbd | 407 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 408 | { |
159ec1fc | 409 | mdk_rdev_t *rdev; |
1da177e4 | 410 | |
159ec1fc | 411 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
412 | if (rdev->desc_nr == nr) |
413 | return rdev; | |
159ec1fc | 414 | |
1da177e4 LT |
415 | return NULL; |
416 | } | |
417 | ||
418 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
419 | { | |
1da177e4 LT |
420 | mdk_rdev_t *rdev; |
421 | ||
159ec1fc | 422 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
423 | if (rdev->bdev->bd_dev == dev) |
424 | return rdev; | |
159ec1fc | 425 | |
1da177e4 LT |
426 | return NULL; |
427 | } | |
428 | ||
d9d166c2 | 429 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
430 | { |
431 | struct mdk_personality *pers; | |
d9d166c2 N |
432 | list_for_each_entry(pers, &pers_list, list) { |
433 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 434 | return pers; |
d9d166c2 N |
435 | if (strcmp(pers->name, clevel)==0) |
436 | return pers; | |
437 | } | |
2604b703 N |
438 | return NULL; |
439 | } | |
440 | ||
b73df2d3 | 441 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 442 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 443 | { |
b73df2d3 AN |
444 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
445 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
446 | } |
447 | ||
e7debaa4 | 448 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
1da177e4 | 449 | { |
0f420358 | 450 | sector_t num_sectors = rdev->sb_start; |
1da177e4 LT |
451 | |
452 | if (chunk_size) | |
e7debaa4 AN |
453 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
454 | return num_sectors; | |
1da177e4 LT |
455 | } |
456 | ||
457 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
458 | { | |
459 | if (rdev->sb_page) | |
460 | MD_BUG(); | |
461 | ||
462 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
463 | if (!rdev->sb_page) { | |
464 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 465 | return -ENOMEM; |
1da177e4 LT |
466 | } |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
471 | static void free_disk_sb(mdk_rdev_t * rdev) | |
472 | { | |
473 | if (rdev->sb_page) { | |
2d1f3b5d | 474 | put_page(rdev->sb_page); |
1da177e4 LT |
475 | rdev->sb_loaded = 0; |
476 | rdev->sb_page = NULL; | |
0f420358 | 477 | rdev->sb_start = 0; |
dd8ac336 | 478 | rdev->sectors = 0; |
1da177e4 LT |
479 | } |
480 | } | |
481 | ||
482 | ||
6712ecf8 | 483 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
484 | { |
485 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 486 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 487 | |
3a0f5bbb N |
488 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
489 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
490 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
491 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 492 | md_error(mddev, rdev); |
3a0f5bbb | 493 | } |
7bfa19f2 | 494 | |
a9701a30 N |
495 | if (atomic_dec_and_test(&mddev->pending_writes)) |
496 | wake_up(&mddev->sb_wait); | |
f8b58edf | 497 | bio_put(bio); |
7bfa19f2 N |
498 | } |
499 | ||
6712ecf8 | 500 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
501 | { |
502 | struct bio *bio2 = bio->bi_private; | |
503 | mdk_rdev_t *rdev = bio2->bi_private; | |
504 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
505 | |
506 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
507 | error == -EOPNOTSUPP) { | |
508 | unsigned long flags; | |
509 | /* barriers don't appear to be supported :-( */ | |
510 | set_bit(BarriersNotsupp, &rdev->flags); | |
511 | mddev->barriers_work = 0; | |
512 | spin_lock_irqsave(&mddev->write_lock, flags); | |
513 | bio2->bi_next = mddev->biolist; | |
514 | mddev->biolist = bio2; | |
515 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
516 | wake_up(&mddev->sb_wait); | |
517 | bio_put(bio); | |
6712ecf8 N |
518 | } else { |
519 | bio_put(bio2); | |
520 | bio->bi_private = rdev; | |
521 | super_written(bio, error); | |
a9701a30 | 522 | } |
a9701a30 N |
523 | } |
524 | ||
7bfa19f2 N |
525 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
526 | sector_t sector, int size, struct page *page) | |
527 | { | |
528 | /* write first size bytes of page to sector of rdev | |
529 | * Increment mddev->pending_writes before returning | |
530 | * and decrement it on completion, waking up sb_wait | |
531 | * if zero is reached. | |
532 | * If an error occurred, call md_error | |
a9701a30 N |
533 | * |
534 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
535 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
536 | */ |
537 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
93dbb393 | 538 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); |
7bfa19f2 N |
539 | |
540 | bio->bi_bdev = rdev->bdev; | |
541 | bio->bi_sector = sector; | |
542 | bio_add_page(bio, page, size, 0); | |
543 | bio->bi_private = rdev; | |
544 | bio->bi_end_io = super_written; | |
a9701a30 N |
545 | bio->bi_rw = rw; |
546 | ||
7bfa19f2 | 547 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
548 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
549 | struct bio *rbio; | |
550 | rw |= (1<<BIO_RW_BARRIER); | |
551 | rbio = bio_clone(bio, GFP_NOIO); | |
552 | rbio->bi_private = bio; | |
553 | rbio->bi_end_io = super_written_barrier; | |
554 | submit_bio(rw, rbio); | |
555 | } else | |
556 | submit_bio(rw, bio); | |
557 | } | |
558 | ||
559 | void md_super_wait(mddev_t *mddev) | |
560 | { | |
561 | /* wait for all superblock writes that were scheduled to complete. | |
562 | * if any had to be retried (due to BARRIER problems), retry them | |
563 | */ | |
564 | DEFINE_WAIT(wq); | |
565 | for(;;) { | |
566 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
567 | if (atomic_read(&mddev->pending_writes)==0) | |
568 | break; | |
569 | while (mddev->biolist) { | |
570 | struct bio *bio; | |
571 | spin_lock_irq(&mddev->write_lock); | |
572 | bio = mddev->biolist; | |
573 | mddev->biolist = bio->bi_next ; | |
574 | bio->bi_next = NULL; | |
575 | spin_unlock_irq(&mddev->write_lock); | |
576 | submit_bio(bio->bi_rw, bio); | |
577 | } | |
578 | schedule(); | |
579 | } | |
580 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
581 | } |
582 | ||
6712ecf8 | 583 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 584 | { |
1da177e4 | 585 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
586 | } |
587 | ||
a654b9d8 | 588 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
589 | struct page *page, int rw) |
590 | { | |
baaa2c51 | 591 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
592 | struct completion event; |
593 | int ret; | |
594 | ||
93dbb393 | 595 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
1da177e4 LT |
596 | |
597 | bio->bi_bdev = bdev; | |
598 | bio->bi_sector = sector; | |
599 | bio_add_page(bio, page, size, 0); | |
600 | init_completion(&event); | |
601 | bio->bi_private = &event; | |
602 | bio->bi_end_io = bi_complete; | |
603 | submit_bio(rw, bio); | |
604 | wait_for_completion(&event); | |
605 | ||
606 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
607 | bio_put(bio); | |
608 | return ret; | |
609 | } | |
a8745db2 | 610 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 611 | |
0002b271 | 612 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
613 | { |
614 | char b[BDEVNAME_SIZE]; | |
615 | if (!rdev->sb_page) { | |
616 | MD_BUG(); | |
617 | return -EINVAL; | |
618 | } | |
619 | if (rdev->sb_loaded) | |
620 | return 0; | |
621 | ||
622 | ||
0f420358 | 623 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
624 | goto fail; |
625 | rdev->sb_loaded = 1; | |
626 | return 0; | |
627 | ||
628 | fail: | |
629 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
630 | bdevname(rdev->bdev,b)); | |
631 | return -EINVAL; | |
632 | } | |
633 | ||
634 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
635 | { | |
05710466 AN |
636 | return sb1->set_uuid0 == sb2->set_uuid0 && |
637 | sb1->set_uuid1 == sb2->set_uuid1 && | |
638 | sb1->set_uuid2 == sb2->set_uuid2 && | |
639 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
640 | } |
641 | ||
1da177e4 LT |
642 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
643 | { | |
644 | int ret; | |
645 | mdp_super_t *tmp1, *tmp2; | |
646 | ||
647 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
648 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
649 | ||
650 | if (!tmp1 || !tmp2) { | |
651 | ret = 0; | |
35020f1a | 652 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
653 | goto abort; |
654 | } | |
655 | ||
656 | *tmp1 = *sb1; | |
657 | *tmp2 = *sb2; | |
658 | ||
659 | /* | |
660 | * nr_disks is not constant | |
661 | */ | |
662 | tmp1->nr_disks = 0; | |
663 | tmp2->nr_disks = 0; | |
664 | ||
ce0c8e05 | 665 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 666 | abort: |
990a8baf JJ |
667 | kfree(tmp1); |
668 | kfree(tmp2); | |
1da177e4 LT |
669 | return ret; |
670 | } | |
671 | ||
4d167f09 N |
672 | |
673 | static u32 md_csum_fold(u32 csum) | |
674 | { | |
675 | csum = (csum & 0xffff) + (csum >> 16); | |
676 | return (csum & 0xffff) + (csum >> 16); | |
677 | } | |
678 | ||
1da177e4 LT |
679 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
680 | { | |
4d167f09 N |
681 | u64 newcsum = 0; |
682 | u32 *sb32 = (u32*)sb; | |
683 | int i; | |
1da177e4 LT |
684 | unsigned int disk_csum, csum; |
685 | ||
686 | disk_csum = sb->sb_csum; | |
687 | sb->sb_csum = 0; | |
4d167f09 N |
688 | |
689 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
690 | newcsum += sb32[i]; | |
691 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
692 | ||
693 | ||
694 | #ifdef CONFIG_ALPHA | |
695 | /* This used to use csum_partial, which was wrong for several | |
696 | * reasons including that different results are returned on | |
697 | * different architectures. It isn't critical that we get exactly | |
698 | * the same return value as before (we always csum_fold before | |
699 | * testing, and that removes any differences). However as we | |
700 | * know that csum_partial always returned a 16bit value on | |
701 | * alphas, do a fold to maximise conformity to previous behaviour. | |
702 | */ | |
703 | sb->sb_csum = md_csum_fold(disk_csum); | |
704 | #else | |
1da177e4 | 705 | sb->sb_csum = disk_csum; |
4d167f09 | 706 | #endif |
1da177e4 LT |
707 | return csum; |
708 | } | |
709 | ||
710 | ||
711 | /* | |
712 | * Handle superblock details. | |
713 | * We want to be able to handle multiple superblock formats | |
714 | * so we have a common interface to them all, and an array of | |
715 | * different handlers. | |
716 | * We rely on user-space to write the initial superblock, and support | |
717 | * reading and updating of superblocks. | |
718 | * Interface methods are: | |
719 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
720 | * loads and validates a superblock on dev. | |
721 | * if refdev != NULL, compare superblocks on both devices | |
722 | * Return: | |
723 | * 0 - dev has a superblock that is compatible with refdev | |
724 | * 1 - dev has a superblock that is compatible and newer than refdev | |
725 | * so dev should be used as the refdev in future | |
726 | * -EINVAL superblock incompatible or invalid | |
727 | * -othererror e.g. -EIO | |
728 | * | |
729 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
730 | * Verify that dev is acceptable into mddev. | |
731 | * The first time, mddev->raid_disks will be 0, and data from | |
732 | * dev should be merged in. Subsequent calls check that dev | |
733 | * is new enough. Return 0 or -EINVAL | |
734 | * | |
735 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
736 | * Update the superblock for rdev with data in mddev | |
737 | * This does not write to disc. | |
738 | * | |
739 | */ | |
740 | ||
741 | struct super_type { | |
0cd17fec CW |
742 | char *name; |
743 | struct module *owner; | |
744 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
745 | int minor_version); | |
746 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
747 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
748 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 749 | sector_t num_sectors); |
1da177e4 LT |
750 | }; |
751 | ||
752 | /* | |
753 | * load_super for 0.90.0 | |
754 | */ | |
755 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
756 | { | |
757 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
758 | mdp_super_t *sb; | |
759 | int ret; | |
1da177e4 LT |
760 | |
761 | /* | |
0f420358 | 762 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
763 | * it's at the end of the disk. |
764 | * | |
765 | * It also happens to be a multiple of 4Kb. | |
766 | */ | |
0f420358 | 767 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 768 | |
0002b271 | 769 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
770 | if (ret) return ret; |
771 | ||
772 | ret = -EINVAL; | |
773 | ||
774 | bdevname(rdev->bdev, b); | |
775 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
776 | ||
777 | if (sb->md_magic != MD_SB_MAGIC) { | |
778 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
779 | b); | |
780 | goto abort; | |
781 | } | |
782 | ||
783 | if (sb->major_version != 0 || | |
f6705578 N |
784 | sb->minor_version < 90 || |
785 | sb->minor_version > 91) { | |
1da177e4 LT |
786 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
787 | sb->major_version, sb->minor_version, | |
788 | b); | |
789 | goto abort; | |
790 | } | |
791 | ||
792 | if (sb->raid_disks <= 0) | |
793 | goto abort; | |
794 | ||
4d167f09 | 795 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
796 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
797 | b); | |
798 | goto abort; | |
799 | } | |
800 | ||
801 | rdev->preferred_minor = sb->md_minor; | |
802 | rdev->data_offset = 0; | |
0002b271 | 803 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 | 804 | |
e11e93fa N |
805 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
806 | if (sb->level != 1 && sb->level != 4 | |
807 | && sb->level != 5 && sb->level != 6 | |
808 | && sb->level != 10) { | |
809 | /* FIXME use a better test */ | |
810 | printk(KERN_WARNING | |
811 | "md: bitmaps not supported for this level.\n"); | |
812 | goto abort; | |
813 | } | |
814 | } | |
815 | ||
1da177e4 LT |
816 | if (sb->level == LEVEL_MULTIPATH) |
817 | rdev->desc_nr = -1; | |
818 | else | |
819 | rdev->desc_nr = sb->this_disk.number; | |
820 | ||
9a7b2b0f | 821 | if (!refdev) { |
1da177e4 | 822 | ret = 1; |
9a7b2b0f | 823 | } else { |
1da177e4 LT |
824 | __u64 ev1, ev2; |
825 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
826 | if (!uuid_equal(refsb, sb)) { | |
827 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
828 | b, bdevname(refdev->bdev,b2)); | |
829 | goto abort; | |
830 | } | |
831 | if (!sb_equal(refsb, sb)) { | |
832 | printk(KERN_WARNING "md: %s has same UUID" | |
833 | " but different superblock to %s\n", | |
834 | b, bdevname(refdev->bdev, b2)); | |
835 | goto abort; | |
836 | } | |
837 | ev1 = md_event(sb); | |
838 | ev2 = md_event(refsb); | |
839 | if (ev1 > ev2) | |
840 | ret = 1; | |
841 | else | |
842 | ret = 0; | |
843 | } | |
dd8ac336 | 844 | rdev->sectors = calc_num_sectors(rdev, sb->chunk_size); |
1da177e4 | 845 | |
dd8ac336 | 846 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
847 | /* "this cannot possibly happen" ... */ |
848 | ret = -EINVAL; | |
849 | ||
1da177e4 LT |
850 | abort: |
851 | return ret; | |
852 | } | |
853 | ||
854 | /* | |
855 | * validate_super for 0.90.0 | |
856 | */ | |
857 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
858 | { | |
859 | mdp_disk_t *desc; | |
860 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 861 | __u64 ev1 = md_event(sb); |
1da177e4 | 862 | |
41158c7e | 863 | rdev->raid_disk = -1; |
c5d79adb N |
864 | clear_bit(Faulty, &rdev->flags); |
865 | clear_bit(In_sync, &rdev->flags); | |
866 | clear_bit(WriteMostly, &rdev->flags); | |
867 | clear_bit(BarriersNotsupp, &rdev->flags); | |
868 | ||
1da177e4 LT |
869 | if (mddev->raid_disks == 0) { |
870 | mddev->major_version = 0; | |
871 | mddev->minor_version = sb->minor_version; | |
872 | mddev->patch_version = sb->patch_version; | |
e691063a | 873 | mddev->external = 0; |
1da177e4 LT |
874 | mddev->chunk_size = sb->chunk_size; |
875 | mddev->ctime = sb->ctime; | |
876 | mddev->utime = sb->utime; | |
877 | mddev->level = sb->level; | |
d9d166c2 | 878 | mddev->clevel[0] = 0; |
1da177e4 LT |
879 | mddev->layout = sb->layout; |
880 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 881 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 882 | mddev->events = ev1; |
9223214e | 883 | mddev->bitmap_offset = 0; |
36fa3063 | 884 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 | 885 | |
f6705578 N |
886 | if (mddev->minor_version >= 91) { |
887 | mddev->reshape_position = sb->reshape_position; | |
888 | mddev->delta_disks = sb->delta_disks; | |
889 | mddev->new_level = sb->new_level; | |
890 | mddev->new_layout = sb->new_layout; | |
891 | mddev->new_chunk = sb->new_chunk; | |
892 | } else { | |
893 | mddev->reshape_position = MaxSector; | |
894 | mddev->delta_disks = 0; | |
895 | mddev->new_level = mddev->level; | |
896 | mddev->new_layout = mddev->layout; | |
897 | mddev->new_chunk = mddev->chunk_size; | |
898 | } | |
899 | ||
1da177e4 LT |
900 | if (sb->state & (1<<MD_SB_CLEAN)) |
901 | mddev->recovery_cp = MaxSector; | |
902 | else { | |
903 | if (sb->events_hi == sb->cp_events_hi && | |
904 | sb->events_lo == sb->cp_events_lo) { | |
905 | mddev->recovery_cp = sb->recovery_cp; | |
906 | } else | |
907 | mddev->recovery_cp = 0; | |
908 | } | |
909 | ||
910 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
911 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
912 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
913 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
914 | ||
915 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
916 | |
917 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
e11e93fa | 918 | mddev->bitmap_file == NULL) |
36fa3063 | 919 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 | 920 | |
41158c7e N |
921 | } else if (mddev->pers == NULL) { |
922 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
923 | ++ev1; |
924 | if (ev1 < mddev->events) | |
925 | return -EINVAL; | |
41158c7e N |
926 | } else if (mddev->bitmap) { |
927 | /* if adding to array with a bitmap, then we can accept an | |
928 | * older device ... but not too old. | |
929 | */ | |
41158c7e N |
930 | if (ev1 < mddev->bitmap->events_cleared) |
931 | return 0; | |
07d84d10 N |
932 | } else { |
933 | if (ev1 < mddev->events) | |
934 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
935 | return 0; | |
936 | } | |
41158c7e | 937 | |
1da177e4 | 938 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
939 | desc = sb->disks + rdev->desc_nr; |
940 | ||
941 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 942 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
943 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
944 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 945 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
946 | rdev->raid_disk = desc->raid_disk; |
947 | } | |
8ddf9efe N |
948 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
949 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 950 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 951 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
952 | return 0; |
953 | } | |
954 | ||
955 | /* | |
956 | * sync_super for 0.90.0 | |
957 | */ | |
958 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
959 | { | |
960 | mdp_super_t *sb; | |
1da177e4 LT |
961 | mdk_rdev_t *rdev2; |
962 | int next_spare = mddev->raid_disks; | |
19133a42 | 963 | |
1da177e4 LT |
964 | |
965 | /* make rdev->sb match mddev data.. | |
966 | * | |
967 | * 1/ zero out disks | |
968 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
969 | * 3/ any empty disks < next_spare become removed | |
970 | * | |
971 | * disks[0] gets initialised to REMOVED because | |
972 | * we cannot be sure from other fields if it has | |
973 | * been initialised or not. | |
974 | */ | |
975 | int i; | |
976 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
977 | ||
61181565 N |
978 | rdev->sb_size = MD_SB_BYTES; |
979 | ||
1da177e4 LT |
980 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
981 | ||
982 | memset(sb, 0, sizeof(*sb)); | |
983 | ||
984 | sb->md_magic = MD_SB_MAGIC; | |
985 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
986 | sb->patch_version = mddev->patch_version; |
987 | sb->gvalid_words = 0; /* ignored */ | |
988 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
989 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
990 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
991 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
992 | ||
993 | sb->ctime = mddev->ctime; | |
994 | sb->level = mddev->level; | |
58c0fed4 | 995 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
996 | sb->raid_disks = mddev->raid_disks; |
997 | sb->md_minor = mddev->md_minor; | |
e691063a | 998 | sb->not_persistent = 0; |
1da177e4 LT |
999 | sb->utime = mddev->utime; |
1000 | sb->state = 0; | |
1001 | sb->events_hi = (mddev->events>>32); | |
1002 | sb->events_lo = (u32)mddev->events; | |
1003 | ||
f6705578 N |
1004 | if (mddev->reshape_position == MaxSector) |
1005 | sb->minor_version = 90; | |
1006 | else { | |
1007 | sb->minor_version = 91; | |
1008 | sb->reshape_position = mddev->reshape_position; | |
1009 | sb->new_level = mddev->new_level; | |
1010 | sb->delta_disks = mddev->delta_disks; | |
1011 | sb->new_layout = mddev->new_layout; | |
1012 | sb->new_chunk = mddev->new_chunk; | |
1013 | } | |
1014 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1015 | if (mddev->in_sync) |
1016 | { | |
1017 | sb->recovery_cp = mddev->recovery_cp; | |
1018 | sb->cp_events_hi = (mddev->events>>32); | |
1019 | sb->cp_events_lo = (u32)mddev->events; | |
1020 | if (mddev->recovery_cp == MaxSector) | |
1021 | sb->state = (1<< MD_SB_CLEAN); | |
1022 | } else | |
1023 | sb->recovery_cp = 0; | |
1024 | ||
1025 | sb->layout = mddev->layout; | |
1026 | sb->chunk_size = mddev->chunk_size; | |
1027 | ||
a654b9d8 N |
1028 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
1029 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
1030 | ||
1da177e4 | 1031 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1032 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1033 | mdp_disk_t *d; |
86e6ffdd | 1034 | int desc_nr; |
b2d444d7 N |
1035 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
1036 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 1037 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1038 | else |
86e6ffdd | 1039 | desc_nr = next_spare++; |
19133a42 | 1040 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1041 | d = &sb->disks[rdev2->desc_nr]; |
1042 | nr_disks++; | |
1043 | d->number = rdev2->desc_nr; | |
1044 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1045 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
1046 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
1047 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
1048 | d->raid_disk = rdev2->raid_disk; |
1049 | else | |
1050 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1051 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1052 | d->state = (1<<MD_DISK_FAULTY); |
1be7892f | 1053 | else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
1054 | d->state = (1<<MD_DISK_ACTIVE); |
1055 | d->state |= (1<<MD_DISK_SYNC); | |
1056 | active++; | |
1057 | working++; | |
1058 | } else { | |
1059 | d->state = 0; | |
1060 | spare++; | |
1061 | working++; | |
1062 | } | |
8ddf9efe N |
1063 | if (test_bit(WriteMostly, &rdev2->flags)) |
1064 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1065 | } |
1da177e4 LT |
1066 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1067 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1068 | mdp_disk_t *d = &sb->disks[i]; | |
1069 | if (d->state == 0 && d->number == 0) { | |
1070 | d->number = i; | |
1071 | d->raid_disk = i; | |
1072 | d->state = (1<<MD_DISK_REMOVED); | |
1073 | d->state |= (1<<MD_DISK_FAULTY); | |
1074 | failed++; | |
1075 | } | |
1076 | } | |
1077 | sb->nr_disks = nr_disks; | |
1078 | sb->active_disks = active; | |
1079 | sb->working_disks = working; | |
1080 | sb->failed_disks = failed; | |
1081 | sb->spare_disks = spare; | |
1082 | ||
1083 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1084 | sb->sb_csum = calc_sb_csum(sb); | |
1085 | } | |
1086 | ||
0cd17fec CW |
1087 | /* |
1088 | * rdev_size_change for 0.90.0 | |
1089 | */ | |
1090 | static unsigned long long | |
15f4a5fd | 1091 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1092 | { |
58c0fed4 | 1093 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1094 | return 0; /* component must fit device */ |
0cd17fec CW |
1095 | if (rdev->mddev->bitmap_offset) |
1096 | return 0; /* can't move bitmap */ | |
0f420358 | 1097 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1098 | if (!num_sectors || num_sectors > rdev->sb_start) |
1099 | num_sectors = rdev->sb_start; | |
0f420358 | 1100 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1101 | rdev->sb_page); |
1102 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1103 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1104 | } |
1105 | ||
1106 | ||
1da177e4 LT |
1107 | /* |
1108 | * version 1 superblock | |
1109 | */ | |
1110 | ||
1c05b4bc | 1111 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1112 | { |
1c05b4bc N |
1113 | __le32 disk_csum; |
1114 | u32 csum; | |
1da177e4 LT |
1115 | unsigned long long newcsum; |
1116 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1117 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1118 | int i; |
1119 | ||
1120 | disk_csum = sb->sb_csum; | |
1121 | sb->sb_csum = 0; | |
1122 | newcsum = 0; | |
1123 | for (i=0; size>=4; size -= 4 ) | |
1124 | newcsum += le32_to_cpu(*isuper++); | |
1125 | ||
1126 | if (size == 2) | |
1c05b4bc | 1127 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1128 | |
1129 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1130 | sb->sb_csum = disk_csum; | |
1131 | return cpu_to_le32(csum); | |
1132 | } | |
1133 | ||
1134 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1135 | { | |
1136 | struct mdp_superblock_1 *sb; | |
1137 | int ret; | |
0f420358 | 1138 | sector_t sb_start; |
1da177e4 | 1139 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1140 | int bmask; |
1da177e4 LT |
1141 | |
1142 | /* | |
0f420358 | 1143 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1144 | * It is always aligned to a 4K boundary and |
1145 | * depeding on minor_version, it can be: | |
1146 | * 0: At least 8K, but less than 12K, from end of device | |
1147 | * 1: At start of device | |
1148 | * 2: 4K from start of device. | |
1149 | */ | |
1150 | switch(minor_version) { | |
1151 | case 0: | |
0f420358 AN |
1152 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1153 | sb_start -= 8*2; | |
1154 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1155 | break; |
1156 | case 1: | |
0f420358 | 1157 | sb_start = 0; |
1da177e4 LT |
1158 | break; |
1159 | case 2: | |
0f420358 | 1160 | sb_start = 8; |
1da177e4 LT |
1161 | break; |
1162 | default: | |
1163 | return -EINVAL; | |
1164 | } | |
0f420358 | 1165 | rdev->sb_start = sb_start; |
1da177e4 | 1166 | |
0002b271 N |
1167 | /* superblock is rarely larger than 1K, but it can be larger, |
1168 | * and it is safe to read 4k, so we do that | |
1169 | */ | |
1170 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1171 | if (ret) return ret; |
1172 | ||
1173 | ||
1174 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1175 | ||
1176 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1177 | sb->major_version != cpu_to_le32(1) || | |
1178 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1179 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1180 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1181 | return -EINVAL; |
1182 | ||
1183 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1184 | printk("md: invalid superblock checksum on %s\n", | |
1185 | bdevname(rdev->bdev,b)); | |
1186 | return -EINVAL; | |
1187 | } | |
1188 | if (le64_to_cpu(sb->data_size) < 10) { | |
1189 | printk("md: data_size too small on %s\n", | |
1190 | bdevname(rdev->bdev,b)); | |
1191 | return -EINVAL; | |
1192 | } | |
e11e93fa N |
1193 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
1194 | if (sb->level != cpu_to_le32(1) && | |
1195 | sb->level != cpu_to_le32(4) && | |
1196 | sb->level != cpu_to_le32(5) && | |
1197 | sb->level != cpu_to_le32(6) && | |
1198 | sb->level != cpu_to_le32(10)) { | |
1199 | printk(KERN_WARNING | |
1200 | "md: bitmaps not supported for this level.\n"); | |
1201 | return -EINVAL; | |
1202 | } | |
1203 | } | |
1204 | ||
1da177e4 LT |
1205 | rdev->preferred_minor = 0xffff; |
1206 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1207 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1208 | |
0002b271 | 1209 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1210 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1211 | if (rdev->sb_size & bmask) |
a1801f85 N |
1212 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1213 | ||
1214 | if (minor_version | |
0f420358 | 1215 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1216 | return -EINVAL; |
0002b271 | 1217 | |
31b65a0d N |
1218 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1219 | rdev->desc_nr = -1; | |
1220 | else | |
1221 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1222 | ||
9a7b2b0f | 1223 | if (!refdev) { |
8ed75463 | 1224 | ret = 1; |
9a7b2b0f | 1225 | } else { |
1da177e4 LT |
1226 | __u64 ev1, ev2; |
1227 | struct mdp_superblock_1 *refsb = | |
1228 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1229 | ||
1230 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1231 | sb->level != refsb->level || | |
1232 | sb->layout != refsb->layout || | |
1233 | sb->chunksize != refsb->chunksize) { | |
1234 | printk(KERN_WARNING "md: %s has strangely different" | |
1235 | " superblock to %s\n", | |
1236 | bdevname(rdev->bdev,b), | |
1237 | bdevname(refdev->bdev,b2)); | |
1238 | return -EINVAL; | |
1239 | } | |
1240 | ev1 = le64_to_cpu(sb->events); | |
1241 | ev2 = le64_to_cpu(refsb->events); | |
1242 | ||
1243 | if (ev1 > ev2) | |
8ed75463 N |
1244 | ret = 1; |
1245 | else | |
1246 | ret = 0; | |
1da177e4 | 1247 | } |
a1801f85 | 1248 | if (minor_version) |
dd8ac336 AN |
1249 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
1250 | le64_to_cpu(sb->data_offset); | |
1da177e4 | 1251 | else |
dd8ac336 AN |
1252 | rdev->sectors = rdev->sb_start; |
1253 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1254 | return -EINVAL; |
dd8ac336 | 1255 | rdev->sectors = le64_to_cpu(sb->data_size); |
1da177e4 | 1256 | if (le32_to_cpu(sb->chunksize)) |
dd8ac336 | 1257 | rdev->sectors &= ~((sector_t)le32_to_cpu(sb->chunksize) - 1); |
2bf071bf | 1258 | |
dd8ac336 | 1259 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1260 | return -EINVAL; |
8ed75463 | 1261 | return ret; |
1da177e4 LT |
1262 | } |
1263 | ||
1264 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1265 | { | |
1266 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1267 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1268 | |
41158c7e | 1269 | rdev->raid_disk = -1; |
c5d79adb N |
1270 | clear_bit(Faulty, &rdev->flags); |
1271 | clear_bit(In_sync, &rdev->flags); | |
1272 | clear_bit(WriteMostly, &rdev->flags); | |
1273 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1274 | ||
1da177e4 LT |
1275 | if (mddev->raid_disks == 0) { |
1276 | mddev->major_version = 1; | |
1277 | mddev->patch_version = 0; | |
e691063a | 1278 | mddev->external = 0; |
1da177e4 LT |
1279 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
1280 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1281 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1282 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1283 | mddev->clevel[0] = 0; |
1da177e4 LT |
1284 | mddev->layout = le32_to_cpu(sb->layout); |
1285 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1286 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1287 | mddev->events = ev1; |
9223214e | 1288 | mddev->bitmap_offset = 0; |
29fc7e3e | 1289 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1290 | |
1291 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1292 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1293 | ||
1294 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1295 | |
71c0805c | 1296 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
e11e93fa | 1297 | mddev->bitmap_file == NULL ) |
a654b9d8 | 1298 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
e11e93fa | 1299 | |
f6705578 N |
1300 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1301 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1302 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1303 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1304 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1305 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; | |
1306 | } else { | |
1307 | mddev->reshape_position = MaxSector; | |
1308 | mddev->delta_disks = 0; | |
1309 | mddev->new_level = mddev->level; | |
1310 | mddev->new_layout = mddev->layout; | |
1311 | mddev->new_chunk = mddev->chunk_size; | |
1312 | } | |
1313 | ||
41158c7e N |
1314 | } else if (mddev->pers == NULL) { |
1315 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1316 | ++ev1; |
1317 | if (ev1 < mddev->events) | |
1318 | return -EINVAL; | |
41158c7e N |
1319 | } else if (mddev->bitmap) { |
1320 | /* If adding to array with a bitmap, then we can accept an | |
1321 | * older device, but not too old. | |
1322 | */ | |
41158c7e N |
1323 | if (ev1 < mddev->bitmap->events_cleared) |
1324 | return 0; | |
07d84d10 N |
1325 | } else { |
1326 | if (ev1 < mddev->events) | |
1327 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1328 | return 0; | |
1329 | } | |
1da177e4 LT |
1330 | if (mddev->level != LEVEL_MULTIPATH) { |
1331 | int role; | |
1da177e4 LT |
1332 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
1333 | switch(role) { | |
1334 | case 0xffff: /* spare */ | |
1da177e4 LT |
1335 | break; |
1336 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1337 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1338 | break; |
1339 | default: | |
5fd6c1dc N |
1340 | if ((le32_to_cpu(sb->feature_map) & |
1341 | MD_FEATURE_RECOVERY_OFFSET)) | |
1342 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1343 | else | |
1344 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1345 | rdev->raid_disk = role; |
1346 | break; | |
1347 | } | |
8ddf9efe N |
1348 | if (sb->devflags & WriteMostly1) |
1349 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1350 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1351 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1352 | |
1da177e4 LT |
1353 | return 0; |
1354 | } | |
1355 | ||
1356 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1357 | { | |
1358 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1359 | mdk_rdev_t *rdev2; |
1360 | int max_dev, i; | |
1361 | /* make rdev->sb match mddev and rdev data. */ | |
1362 | ||
1363 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1364 | ||
1365 | sb->feature_map = 0; | |
1366 | sb->pad0 = 0; | |
5fd6c1dc | 1367 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1368 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1369 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1370 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1371 | ||
1372 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1373 | sb->events = cpu_to_le64(mddev->events); | |
1374 | if (mddev->in_sync) | |
1375 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1376 | else | |
1377 | sb->resync_offset = cpu_to_le64(0); | |
1378 | ||
1c05b4bc | 1379 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1380 | |
f0ca340c | 1381 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1382 | sb->size = cpu_to_le64(mddev->dev_sectors); |
f0ca340c | 1383 | |
a654b9d8 N |
1384 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1385 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1386 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1387 | } |
5fd6c1dc N |
1388 | |
1389 | if (rdev->raid_disk >= 0 && | |
97e4f42d N |
1390 | !test_bit(In_sync, &rdev->flags)) { |
1391 | if (mddev->curr_resync_completed > rdev->recovery_offset) | |
1392 | rdev->recovery_offset = mddev->curr_resync_completed; | |
1393 | if (rdev->recovery_offset > 0) { | |
1394 | sb->feature_map |= | |
1395 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1396 | sb->recovery_offset = | |
1397 | cpu_to_le64(rdev->recovery_offset); | |
1398 | } | |
5fd6c1dc N |
1399 | } |
1400 | ||
f6705578 N |
1401 | if (mddev->reshape_position != MaxSector) { |
1402 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1403 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1404 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1405 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1406 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1407 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); | |
1408 | } | |
a654b9d8 | 1409 | |
1da177e4 | 1410 | max_dev = 0; |
159ec1fc | 1411 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1412 | if (rdev2->desc_nr+1 > max_dev) |
1413 | max_dev = rdev2->desc_nr+1; | |
a778b73f N |
1414 | |
1415 | if (max_dev > le32_to_cpu(sb->max_dev)) | |
1416 | sb->max_dev = cpu_to_le32(max_dev); | |
1da177e4 LT |
1417 | for (i=0; i<max_dev;i++) |
1418 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1419 | ||
159ec1fc | 1420 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1421 | i = rdev2->desc_nr; |
b2d444d7 | 1422 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1423 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1424 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1425 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1426 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1427 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1428 | else |
1429 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1430 | } | |
1431 | ||
1da177e4 LT |
1432 | sb->sb_csum = calc_sb_1_csum(sb); |
1433 | } | |
1434 | ||
0cd17fec | 1435 | static unsigned long long |
15f4a5fd | 1436 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1437 | { |
1438 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1439 | sector_t max_sectors; |
58c0fed4 | 1440 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1441 | return 0; /* component must fit device */ |
0f420358 | 1442 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1443 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1444 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1445 | max_sectors -= rdev->data_offset; | |
1446 | if (!num_sectors || num_sectors > max_sectors) | |
1447 | num_sectors = max_sectors; | |
0cd17fec CW |
1448 | } else if (rdev->mddev->bitmap_offset) { |
1449 | /* minor version 0 with bitmap we can't move */ | |
1450 | return 0; | |
1451 | } else { | |
1452 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1453 | sector_t sb_start; |
1454 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1455 | sb_start &= ~(sector_t)(4*2 - 1); | |
dd8ac336 | 1456 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1457 | if (!num_sectors || num_sectors > max_sectors) |
1458 | num_sectors = max_sectors; | |
0f420358 | 1459 | rdev->sb_start = sb_start; |
0cd17fec CW |
1460 | } |
1461 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1462 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1463 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1464 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1465 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1466 | rdev->sb_page); |
1467 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1468 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1469 | } |
1da177e4 | 1470 | |
75c96f85 | 1471 | static struct super_type super_types[] = { |
1da177e4 LT |
1472 | [0] = { |
1473 | .name = "0.90.0", | |
1474 | .owner = THIS_MODULE, | |
0cd17fec CW |
1475 | .load_super = super_90_load, |
1476 | .validate_super = super_90_validate, | |
1477 | .sync_super = super_90_sync, | |
1478 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1479 | }, |
1480 | [1] = { | |
1481 | .name = "md-1", | |
1482 | .owner = THIS_MODULE, | |
0cd17fec CW |
1483 | .load_super = super_1_load, |
1484 | .validate_super = super_1_validate, | |
1485 | .sync_super = super_1_sync, | |
1486 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1487 | }, |
1488 | }; | |
1da177e4 LT |
1489 | |
1490 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1491 | { | |
7dd5e7c3 | 1492 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1493 | |
4b80991c N |
1494 | rcu_read_lock(); |
1495 | rdev_for_each_rcu(rdev, mddev1) | |
1496 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1497 | if (rdev->bdev->bd_contains == |
4b80991c N |
1498 | rdev2->bdev->bd_contains) { |
1499 | rcu_read_unlock(); | |
7dd5e7c3 | 1500 | return 1; |
4b80991c N |
1501 | } |
1502 | rcu_read_unlock(); | |
1da177e4 LT |
1503 | return 0; |
1504 | } | |
1505 | ||
1506 | static LIST_HEAD(pending_raid_disks); | |
1507 | ||
3f9d99c1 MP |
1508 | static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev) |
1509 | { | |
1510 | struct mdk_personality *pers = mddev->pers; | |
1511 | struct gendisk *disk = mddev->gendisk; | |
1512 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); | |
1513 | struct blk_integrity *bi_mddev = blk_get_integrity(disk); | |
1514 | ||
1515 | /* Data integrity passthrough not supported on RAID 4, 5 and 6 */ | |
1516 | if (pers && pers->level >= 4 && pers->level <= 6) | |
1517 | return; | |
1518 | ||
1519 | /* If rdev is integrity capable, register profile for mddev */ | |
1520 | if (!bi_mddev && bi_rdev) { | |
1521 | if (blk_integrity_register(disk, bi_rdev)) | |
1522 | printk(KERN_ERR "%s: %s Could not register integrity!\n", | |
1523 | __func__, disk->disk_name); | |
1524 | else | |
1525 | printk(KERN_NOTICE "Enabling data integrity on %s\n", | |
1526 | disk->disk_name); | |
1527 | return; | |
1528 | } | |
1529 | ||
1530 | /* Check that mddev and rdev have matching profiles */ | |
1531 | if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) { | |
1532 | printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__, | |
1533 | disk->disk_name, rdev->bdev->bd_disk->disk_name); | |
1534 | printk(KERN_NOTICE "Disabling data integrity on %s\n", | |
1535 | disk->disk_name); | |
1536 | blk_integrity_unregister(disk); | |
1537 | } | |
1538 | } | |
1539 | ||
1da177e4 LT |
1540 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1541 | { | |
7dd5e7c3 | 1542 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1543 | struct kobject *ko; |
1edf80d3 | 1544 | char *s; |
5e55e2f5 | 1545 | int err; |
1da177e4 LT |
1546 | |
1547 | if (rdev->mddev) { | |
1548 | MD_BUG(); | |
1549 | return -EINVAL; | |
1550 | } | |
11e2ede0 DW |
1551 | |
1552 | /* prevent duplicates */ | |
1553 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1554 | return -EEXIST; | |
1555 | ||
dd8ac336 AN |
1556 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1557 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1558 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1559 | if (mddev->pers) { |
1560 | /* Cannot change size, so fail | |
1561 | * If mddev->level <= 0, then we don't care | |
1562 | * about aligning sizes (e.g. linear) | |
1563 | */ | |
1564 | if (mddev->level > 0) | |
1565 | return -ENOSPC; | |
1566 | } else | |
dd8ac336 | 1567 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1568 | } |
1da177e4 LT |
1569 | |
1570 | /* Verify rdev->desc_nr is unique. | |
1571 | * If it is -1, assign a free number, else | |
1572 | * check number is not in use | |
1573 | */ | |
1574 | if (rdev->desc_nr < 0) { | |
1575 | int choice = 0; | |
1576 | if (mddev->pers) choice = mddev->raid_disks; | |
1577 | while (find_rdev_nr(mddev, choice)) | |
1578 | choice++; | |
1579 | rdev->desc_nr = choice; | |
1580 | } else { | |
1581 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1582 | return -EBUSY; | |
1583 | } | |
de01dfad N |
1584 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1585 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1586 | mdname(mddev), mddev->max_disks); | |
1587 | return -EBUSY; | |
1588 | } | |
19133a42 | 1589 | bdevname(rdev->bdev,b); |
649316b2 | 1590 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1591 | *s = '!'; |
649316b2 | 1592 | |
1da177e4 | 1593 | rdev->mddev = mddev; |
19133a42 | 1594 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1595 | |
b2d6db58 | 1596 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1597 | goto fail; |
86e6ffdd | 1598 | |
0762b8bd | 1599 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1600 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1601 | kobject_del(&rdev->kobj); | |
1602 | goto fail; | |
1603 | } | |
3c0ee63a N |
1604 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1605 | ||
4b80991c | 1606 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1607 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1608 | |
1609 | /* May as well allow recovery to be retried once */ | |
1610 | mddev->recovery_disabled = 0; | |
3f9d99c1 MP |
1611 | |
1612 | md_integrity_check(rdev, mddev); | |
1da177e4 | 1613 | return 0; |
5e55e2f5 N |
1614 | |
1615 | fail: | |
1616 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1617 | b, mdname(mddev)); | |
1618 | return err; | |
1da177e4 LT |
1619 | } |
1620 | ||
177a99b2 | 1621 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1622 | { |
1623 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1624 | kobject_del(&rdev->kobj); | |
177a99b2 | 1625 | kobject_put(&rdev->kobj); |
5792a285 N |
1626 | } |
1627 | ||
1da177e4 LT |
1628 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1629 | { | |
1630 | char b[BDEVNAME_SIZE]; | |
1631 | if (!rdev->mddev) { | |
1632 | MD_BUG(); | |
1633 | return; | |
1634 | } | |
5463c790 | 1635 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1636 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1637 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1638 | rdev->mddev = NULL; | |
86e6ffdd | 1639 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1640 | sysfs_put(rdev->sysfs_state); |
1641 | rdev->sysfs_state = NULL; | |
5792a285 | 1642 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1643 | * writing to 'remove' to "dev/state". We also need |
1644 | * to delay it due to rcu usage. | |
5792a285 | 1645 | */ |
4b80991c | 1646 | synchronize_rcu(); |
177a99b2 N |
1647 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1648 | kobject_get(&rdev->kobj); | |
5792a285 | 1649 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1650 | } |
1651 | ||
1652 | /* | |
1653 | * prevent the device from being mounted, repartitioned or | |
1654 | * otherwise reused by a RAID array (or any other kernel | |
1655 | * subsystem), by bd_claiming the device. | |
1656 | */ | |
c5d79adb | 1657 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1658 | { |
1659 | int err = 0; | |
1660 | struct block_device *bdev; | |
1661 | char b[BDEVNAME_SIZE]; | |
1662 | ||
2e7b651d | 1663 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1664 | if (IS_ERR(bdev)) { |
1665 | printk(KERN_ERR "md: could not open %s.\n", | |
1666 | __bdevname(dev, b)); | |
1667 | return PTR_ERR(bdev); | |
1668 | } | |
c5d79adb | 1669 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1670 | if (err) { |
1671 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1672 | bdevname(bdev, b)); | |
9a1c3542 | 1673 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1674 | return err; |
1675 | } | |
c5d79adb N |
1676 | if (!shared) |
1677 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1678 | rdev->bdev = bdev; |
1679 | return err; | |
1680 | } | |
1681 | ||
1682 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1683 | { | |
1684 | struct block_device *bdev = rdev->bdev; | |
1685 | rdev->bdev = NULL; | |
1686 | if (!bdev) | |
1687 | MD_BUG(); | |
1688 | bd_release(bdev); | |
9a1c3542 | 1689 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1690 | } |
1691 | ||
1692 | void md_autodetect_dev(dev_t dev); | |
1693 | ||
1694 | static void export_rdev(mdk_rdev_t * rdev) | |
1695 | { | |
1696 | char b[BDEVNAME_SIZE]; | |
1697 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1698 | bdevname(rdev->bdev,b)); | |
1699 | if (rdev->mddev) | |
1700 | MD_BUG(); | |
1701 | free_disk_sb(rdev); | |
1da177e4 | 1702 | #ifndef MODULE |
d0fae18f N |
1703 | if (test_bit(AutoDetected, &rdev->flags)) |
1704 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1705 | #endif |
1706 | unlock_rdev(rdev); | |
86e6ffdd | 1707 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1708 | } |
1709 | ||
1710 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1711 | { | |
1712 | unbind_rdev_from_array(rdev); | |
1713 | export_rdev(rdev); | |
1714 | } | |
1715 | ||
1716 | static void export_array(mddev_t *mddev) | |
1717 | { | |
159ec1fc | 1718 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1719 | |
d089c6af | 1720 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1721 | if (!rdev->mddev) { |
1722 | MD_BUG(); | |
1723 | continue; | |
1724 | } | |
1725 | kick_rdev_from_array(rdev); | |
1726 | } | |
1727 | if (!list_empty(&mddev->disks)) | |
1728 | MD_BUG(); | |
1729 | mddev->raid_disks = 0; | |
1730 | mddev->major_version = 0; | |
1731 | } | |
1732 | ||
1733 | static void print_desc(mdp_disk_t *desc) | |
1734 | { | |
1735 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1736 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1737 | } | |
1738 | ||
cd2ac932 | 1739 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1740 | { |
1741 | int i; | |
1742 | ||
1743 | printk(KERN_INFO | |
1744 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1745 | sb->major_version, sb->minor_version, sb->patch_version, | |
1746 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1747 | sb->ctime); | |
1748 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1749 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1750 | sb->md_minor, sb->layout, sb->chunk_size); | |
1751 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1752 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1753 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1754 | sb->failed_disks, sb->spare_disks, | |
1755 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1756 | ||
1757 | printk(KERN_INFO); | |
1758 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1759 | mdp_disk_t *desc; | |
1760 | ||
1761 | desc = sb->disks + i; | |
1762 | if (desc->number || desc->major || desc->minor || | |
1763 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1764 | printk(" D %2d: ", i); | |
1765 | print_desc(desc); | |
1766 | } | |
1767 | } | |
1768 | printk(KERN_INFO "md: THIS: "); | |
1769 | print_desc(&sb->this_disk); | |
cd2ac932 | 1770 | } |
1da177e4 | 1771 | |
cd2ac932 CR |
1772 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1773 | { | |
1774 | __u8 *uuid; | |
1775 | ||
1776 | uuid = sb->set_uuid; | |
1777 | printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1778 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1779 | KERN_INFO "md: Name: \"%s\" CT:%llu\n", | |
1780 | le32_to_cpu(sb->major_version), | |
1781 | le32_to_cpu(sb->feature_map), | |
1782 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1783 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1784 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1785 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1786 | sb->set_name, | |
1787 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1788 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1789 | ||
1790 | uuid = sb->device_uuid; | |
1791 | printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
1792 | " RO:%llu\n" | |
1793 | KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" | |
1794 | ":%02x%02x%02x%02x%02x%02x\n" | |
1795 | KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1796 | KERN_INFO "md: (MaxDev:%u) \n", | |
1797 | le32_to_cpu(sb->level), | |
1798 | (unsigned long long)le64_to_cpu(sb->size), | |
1799 | le32_to_cpu(sb->raid_disks), | |
1800 | le32_to_cpu(sb->layout), | |
1801 | le32_to_cpu(sb->chunksize), | |
1802 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1803 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1804 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1805 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1806 | le32_to_cpu(sb->dev_number), | |
1807 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1808 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1809 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1810 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1811 | sb->devflags, | |
1812 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1813 | (unsigned long long)le64_to_cpu(sb->events), | |
1814 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1815 | le32_to_cpu(sb->sb_csum), | |
1816 | le32_to_cpu(sb->max_dev) | |
1817 | ); | |
1da177e4 LT |
1818 | } |
1819 | ||
cd2ac932 | 1820 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1821 | { |
1822 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
1823 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
1824 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
1825 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1826 | rdev->desc_nr); | |
1da177e4 | 1827 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1828 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1829 | switch (major_version) { | |
1830 | case 0: | |
1831 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1832 | break; | |
1833 | case 1: | |
1834 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1835 | break; | |
1836 | } | |
1da177e4 LT |
1837 | } else |
1838 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1839 | } | |
1840 | ||
5e56341d | 1841 | static void md_print_devices(void) |
1da177e4 | 1842 | { |
159ec1fc | 1843 | struct list_head *tmp; |
1da177e4 LT |
1844 | mdk_rdev_t *rdev; |
1845 | mddev_t *mddev; | |
1846 | char b[BDEVNAME_SIZE]; | |
1847 | ||
1848 | printk("\n"); | |
1849 | printk("md: **********************************\n"); | |
1850 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1851 | printk("md: **********************************\n"); | |
29ac4aa3 | 1852 | for_each_mddev(mddev, tmp) { |
1da177e4 | 1853 | |
32a7627c N |
1854 | if (mddev->bitmap) |
1855 | bitmap_print_sb(mddev->bitmap); | |
1856 | else | |
1857 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 1858 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
1859 | printk("<%s>", bdevname(rdev->bdev,b)); |
1860 | printk("\n"); | |
1861 | ||
159ec1fc | 1862 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 1863 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
1864 | } |
1865 | printk("md: **********************************\n"); | |
1866 | printk("\n"); | |
1867 | } | |
1868 | ||
1869 | ||
42543769 | 1870 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 1871 | { |
42543769 N |
1872 | /* Update each superblock (in-memory image), but |
1873 | * if we are allowed to, skip spares which already | |
1874 | * have the right event counter, or have one earlier | |
1875 | * (which would mean they aren't being marked as dirty | |
1876 | * with the rest of the array) | |
1877 | */ | |
1da177e4 | 1878 | mdk_rdev_t *rdev; |
1da177e4 | 1879 | |
159ec1fc | 1880 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
1881 | if (rdev->sb_events == mddev->events || |
1882 | (nospares && | |
1883 | rdev->raid_disk < 0 && | |
1884 | (rdev->sb_events&1)==0 && | |
1885 | rdev->sb_events+1 == mddev->events)) { | |
1886 | /* Don't update this superblock */ | |
1887 | rdev->sb_loaded = 2; | |
1888 | } else { | |
1889 | super_types[mddev->major_version]. | |
1890 | sync_super(mddev, rdev); | |
1891 | rdev->sb_loaded = 1; | |
1892 | } | |
1da177e4 LT |
1893 | } |
1894 | } | |
1895 | ||
850b2b42 | 1896 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 1897 | { |
1da177e4 | 1898 | mdk_rdev_t *rdev; |
06d91a5f | 1899 | int sync_req; |
42543769 | 1900 | int nospares = 0; |
1da177e4 | 1901 | |
8377bc80 N |
1902 | if (mddev->external) |
1903 | return; | |
1da177e4 | 1904 | repeat: |
a9701a30 | 1905 | spin_lock_irq(&mddev->write_lock); |
84692195 | 1906 | |
850b2b42 N |
1907 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
1908 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1909 | force_change = 1; | |
1910 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1911 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1912 | * though if events isn't the right even/odd, we will have to do | |
1913 | * spares after all | |
1914 | */ | |
1915 | nospares = 1; | |
1916 | if (force_change) | |
1917 | nospares = 0; | |
1918 | if (mddev->degraded) | |
84692195 N |
1919 | /* If the array is degraded, then skipping spares is both |
1920 | * dangerous and fairly pointless. | |
1921 | * Dangerous because a device that was removed from the array | |
1922 | * might have a event_count that still looks up-to-date, | |
1923 | * so it can be re-added without a resync. | |
1924 | * Pointless because if there are any spares to skip, | |
1925 | * then a recovery will happen and soon that array won't | |
1926 | * be degraded any more and the spare can go back to sleep then. | |
1927 | */ | |
850b2b42 | 1928 | nospares = 0; |
84692195 | 1929 | |
06d91a5f | 1930 | sync_req = mddev->in_sync; |
1da177e4 | 1931 | mddev->utime = get_seconds(); |
42543769 N |
1932 | |
1933 | /* If this is just a dirty<->clean transition, and the array is clean | |
1934 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 1935 | if (nospares |
42543769 | 1936 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
1937 | && (mddev->events & 1) |
1938 | && mddev->events != 1) | |
42543769 N |
1939 | mddev->events--; |
1940 | else { | |
1941 | /* otherwise we have to go forward and ... */ | |
1942 | mddev->events ++; | |
1943 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
1944 | /* .. if the array isn't clean, insist on an odd 'events' */ | |
1945 | if ((mddev->events&1)==0) { | |
1946 | mddev->events++; | |
1947 | nospares = 0; | |
1948 | } | |
1949 | } else { | |
1950 | /* otherwise insist on an even 'events' (for clean states) */ | |
1951 | if ((mddev->events&1)) { | |
1952 | mddev->events++; | |
1953 | nospares = 0; | |
1954 | } | |
1955 | } | |
1956 | } | |
1da177e4 LT |
1957 | |
1958 | if (!mddev->events) { | |
1959 | /* | |
1960 | * oops, this 64-bit counter should never wrap. | |
1961 | * Either we are in around ~1 trillion A.C., assuming | |
1962 | * 1 reboot per second, or we have a bug: | |
1963 | */ | |
1964 | MD_BUG(); | |
1965 | mddev->events --; | |
1966 | } | |
1da177e4 LT |
1967 | |
1968 | /* | |
1969 | * do not write anything to disk if using | |
1970 | * nonpersistent superblocks | |
1971 | */ | |
06d91a5f | 1972 | if (!mddev->persistent) { |
e691063a N |
1973 | if (!mddev->external) |
1974 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1975 | ||
a9701a30 | 1976 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1977 | wake_up(&mddev->sb_wait); |
1da177e4 | 1978 | return; |
06d91a5f | 1979 | } |
e691063a | 1980 | sync_sbs(mddev, nospares); |
a9701a30 | 1981 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1982 | |
1983 | dprintk(KERN_INFO | |
1984 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1985 | mdname(mddev),mddev->in_sync); | |
1986 | ||
4ad13663 | 1987 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 1988 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
1989 | char b[BDEVNAME_SIZE]; |
1990 | dprintk(KERN_INFO "md: "); | |
42543769 N |
1991 | if (rdev->sb_loaded != 1) |
1992 | continue; /* no noise on spare devices */ | |
b2d444d7 | 1993 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1994 | dprintk("(skipping faulty "); |
1995 | ||
1996 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1997 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1998 | md_super_write(mddev,rdev, |
0f420358 | 1999 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2000 | rdev->sb_page); |
2001 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2002 | bdevname(rdev->bdev,b), | |
0f420358 | 2003 | (unsigned long long)rdev->sb_start); |
42543769 | 2004 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2005 | |
1da177e4 LT |
2006 | } else |
2007 | dprintk(")\n"); | |
7bfa19f2 | 2008 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2009 | /* only need to write one superblock... */ |
2010 | break; | |
2011 | } | |
a9701a30 | 2012 | md_super_wait(mddev); |
850b2b42 | 2013 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2014 | |
a9701a30 | 2015 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2016 | if (mddev->in_sync != sync_req || |
2017 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2018 | /* have to write it out again */ |
a9701a30 | 2019 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2020 | goto repeat; |
2021 | } | |
850b2b42 | 2022 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2023 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2024 | wake_up(&mddev->sb_wait); |
06d91a5f | 2025 | |
1da177e4 LT |
2026 | } |
2027 | ||
7f6ce769 | 2028 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2029 | * We want to accept with case. For this we use cmd_match. |
2030 | */ | |
2031 | static int cmd_match(const char *cmd, const char *str) | |
2032 | { | |
2033 | /* See if cmd, written into a sysfs file, matches | |
2034 | * str. They must either be the same, or cmd can | |
2035 | * have a trailing newline | |
2036 | */ | |
2037 | while (*cmd && *str && *cmd == *str) { | |
2038 | cmd++; | |
2039 | str++; | |
2040 | } | |
2041 | if (*cmd == '\n') | |
2042 | cmd++; | |
2043 | if (*str || *cmd) | |
2044 | return 0; | |
2045 | return 1; | |
2046 | } | |
2047 | ||
86e6ffdd N |
2048 | struct rdev_sysfs_entry { |
2049 | struct attribute attr; | |
2050 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2051 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2052 | }; | |
2053 | ||
2054 | static ssize_t | |
96de1e66 | 2055 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2056 | { |
2057 | char *sep = ""; | |
20a49ff6 | 2058 | size_t len = 0; |
86e6ffdd | 2059 | |
b2d444d7 | 2060 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2061 | len+= sprintf(page+len, "%sfaulty",sep); |
2062 | sep = ","; | |
2063 | } | |
b2d444d7 | 2064 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2065 | len += sprintf(page+len, "%sin_sync",sep); |
2066 | sep = ","; | |
2067 | } | |
f655675b N |
2068 | if (test_bit(WriteMostly, &rdev->flags)) { |
2069 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2070 | sep = ","; | |
2071 | } | |
6bfe0b49 DW |
2072 | if (test_bit(Blocked, &rdev->flags)) { |
2073 | len += sprintf(page+len, "%sblocked", sep); | |
2074 | sep = ","; | |
2075 | } | |
b2d444d7 N |
2076 | if (!test_bit(Faulty, &rdev->flags) && |
2077 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2078 | len += sprintf(page+len, "%sspare", sep); |
2079 | sep = ","; | |
2080 | } | |
2081 | return len+sprintf(page+len, "\n"); | |
2082 | } | |
2083 | ||
45dc2de1 N |
2084 | static ssize_t |
2085 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2086 | { | |
2087 | /* can write | |
2088 | * faulty - simulates and error | |
2089 | * remove - disconnects the device | |
f655675b N |
2090 | * writemostly - sets write_mostly |
2091 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2092 | * blocked - sets the Blocked flag |
2093 | * -blocked - clears the Blocked flag | |
45dc2de1 N |
2094 | */ |
2095 | int err = -EINVAL; | |
2096 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2097 | md_error(rdev->mddev, rdev); | |
2098 | err = 0; | |
2099 | } else if (cmd_match(buf, "remove")) { | |
2100 | if (rdev->raid_disk >= 0) | |
2101 | err = -EBUSY; | |
2102 | else { | |
2103 | mddev_t *mddev = rdev->mddev; | |
2104 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2105 | if (mddev->pers) |
2106 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2107 | md_new_event(mddev); |
2108 | err = 0; | |
2109 | } | |
f655675b N |
2110 | } else if (cmd_match(buf, "writemostly")) { |
2111 | set_bit(WriteMostly, &rdev->flags); | |
2112 | err = 0; | |
2113 | } else if (cmd_match(buf, "-writemostly")) { | |
2114 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2115 | err = 0; |
2116 | } else if (cmd_match(buf, "blocked")) { | |
2117 | set_bit(Blocked, &rdev->flags); | |
2118 | err = 0; | |
2119 | } else if (cmd_match(buf, "-blocked")) { | |
2120 | clear_bit(Blocked, &rdev->flags); | |
2121 | wake_up(&rdev->blocked_wait); | |
2122 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2123 | md_wakeup_thread(rdev->mddev->thread); | |
2124 | ||
f655675b | 2125 | err = 0; |
45dc2de1 | 2126 | } |
3c0ee63a N |
2127 | if (!err && rdev->sysfs_state) |
2128 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
2129 | return err ? err : len; |
2130 | } | |
80ca3a44 N |
2131 | static struct rdev_sysfs_entry rdev_state = |
2132 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2133 | |
4dbcdc75 N |
2134 | static ssize_t |
2135 | errors_show(mdk_rdev_t *rdev, char *page) | |
2136 | { | |
2137 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2138 | } | |
2139 | ||
2140 | static ssize_t | |
2141 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2142 | { | |
2143 | char *e; | |
2144 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2145 | if (*buf && (*e == 0 || *e == '\n')) { | |
2146 | atomic_set(&rdev->corrected_errors, n); | |
2147 | return len; | |
2148 | } | |
2149 | return -EINVAL; | |
2150 | } | |
2151 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2152 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2153 | |
014236d2 N |
2154 | static ssize_t |
2155 | slot_show(mdk_rdev_t *rdev, char *page) | |
2156 | { | |
2157 | if (rdev->raid_disk < 0) | |
2158 | return sprintf(page, "none\n"); | |
2159 | else | |
2160 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2161 | } | |
2162 | ||
2163 | static ssize_t | |
2164 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2165 | { | |
2166 | char *e; | |
c303da6d N |
2167 | int err; |
2168 | char nm[20]; | |
014236d2 N |
2169 | int slot = simple_strtoul(buf, &e, 10); |
2170 | if (strncmp(buf, "none", 4)==0) | |
2171 | slot = -1; | |
2172 | else if (e==buf || (*e && *e!= '\n')) | |
2173 | return -EINVAL; | |
6c2fce2e | 2174 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2175 | /* Setting 'slot' on an active array requires also |
2176 | * updating the 'rd%d' link, and communicating | |
2177 | * with the personality with ->hot_*_disk. | |
2178 | * For now we only support removing | |
2179 | * failed/spare devices. This normally happens automatically, | |
2180 | * but not when the metadata is externally managed. | |
2181 | */ | |
c303da6d N |
2182 | if (rdev->raid_disk == -1) |
2183 | return -EEXIST; | |
2184 | /* personality does all needed checks */ | |
2185 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2186 | return -EINVAL; | |
2187 | err = rdev->mddev->pers-> | |
2188 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2189 | if (err) | |
2190 | return err; | |
2191 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2192 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2193 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2194 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2195 | } else if (rdev->mddev->pers) { |
2196 | mdk_rdev_t *rdev2; | |
6c2fce2e NB |
2197 | /* Activating a spare .. or possibly reactivating |
2198 | * if we every get bitmaps working here. | |
2199 | */ | |
2200 | ||
2201 | if (rdev->raid_disk != -1) | |
2202 | return -EBUSY; | |
2203 | ||
2204 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2205 | return -EINVAL; | |
2206 | ||
159ec1fc | 2207 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2208 | if (rdev2->raid_disk == slot) |
2209 | return -EEXIST; | |
2210 | ||
2211 | rdev->raid_disk = slot; | |
2212 | if (test_bit(In_sync, &rdev->flags)) | |
2213 | rdev->saved_raid_disk = slot; | |
2214 | else | |
2215 | rdev->saved_raid_disk = -1; | |
2216 | err = rdev->mddev->pers-> | |
2217 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2218 | if (err) { |
6c2fce2e | 2219 | rdev->raid_disk = -1; |
6c2fce2e | 2220 | return err; |
52664732 | 2221 | } else |
3c0ee63a | 2222 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2223 | sprintf(nm, "rd%d", rdev->raid_disk); |
2224 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2225 | printk(KERN_WARNING | |
2226 | "md: cannot register " | |
2227 | "%s for %s\n", | |
2228 | nm, mdname(rdev->mddev)); | |
2229 | ||
2230 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2231 | } else { |
2232 | if (slot >= rdev->mddev->raid_disks) | |
2233 | return -ENOSPC; | |
2234 | rdev->raid_disk = slot; | |
2235 | /* assume it is working */ | |
c5d79adb N |
2236 | clear_bit(Faulty, &rdev->flags); |
2237 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2238 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2239 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2240 | } |
014236d2 N |
2241 | return len; |
2242 | } | |
2243 | ||
2244 | ||
2245 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2246 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2247 | |
93c8cad0 N |
2248 | static ssize_t |
2249 | offset_show(mdk_rdev_t *rdev, char *page) | |
2250 | { | |
6961ece4 | 2251 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2252 | } |
2253 | ||
2254 | static ssize_t | |
2255 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2256 | { | |
2257 | char *e; | |
2258 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2259 | if (e==buf || (*e && *e != '\n')) | |
2260 | return -EINVAL; | |
8ed0a521 | 2261 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2262 | return -EBUSY; |
dd8ac336 | 2263 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2264 | /* Must set offset before size, so overlap checks |
2265 | * can be sane */ | |
2266 | return -EBUSY; | |
93c8cad0 N |
2267 | rdev->data_offset = offset; |
2268 | return len; | |
2269 | } | |
2270 | ||
2271 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2272 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2273 | |
83303b61 N |
2274 | static ssize_t |
2275 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2276 | { | |
dd8ac336 | 2277 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2278 | } |
2279 | ||
c5d79adb N |
2280 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2281 | { | |
2282 | /* check if two start/length pairs overlap */ | |
2283 | if (s1+l1 <= s2) | |
2284 | return 0; | |
2285 | if (s2+l2 <= s1) | |
2286 | return 0; | |
2287 | return 1; | |
2288 | } | |
2289 | ||
b522adcd DW |
2290 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2291 | { | |
2292 | unsigned long long blocks; | |
2293 | sector_t new; | |
2294 | ||
2295 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2296 | return -EINVAL; | |
2297 | ||
2298 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2299 | return -EINVAL; /* sector conversion overflow */ | |
2300 | ||
2301 | new = blocks * 2; | |
2302 | if (new != blocks * 2) | |
2303 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2304 | ||
2305 | *sectors = new; | |
2306 | return 0; | |
2307 | } | |
2308 | ||
83303b61 N |
2309 | static ssize_t |
2310 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2311 | { | |
27c529bb | 2312 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2313 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2314 | sector_t sectors; |
27c529bb | 2315 | |
b522adcd | 2316 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2317 | return -EINVAL; |
0cd17fec | 2318 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2319 | if (my_mddev->persistent) { |
dd8ac336 AN |
2320 | sectors = super_types[my_mddev->major_version]. |
2321 | rdev_size_change(rdev, sectors); | |
2322 | if (!sectors) | |
0cd17fec | 2323 | return -EBUSY; |
dd8ac336 AN |
2324 | } else if (!sectors) |
2325 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2326 | rdev->data_offset; | |
0cd17fec | 2327 | } |
dd8ac336 | 2328 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2329 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2330 | |
dd8ac336 AN |
2331 | rdev->sectors = sectors; |
2332 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2333 | /* need to check that all other rdevs with the same ->bdev |
2334 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2335 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2336 | * we have to change it back, we will have the lock again. |
2337 | */ | |
2338 | mddev_t *mddev; | |
2339 | int overlap = 0; | |
159ec1fc | 2340 | struct list_head *tmp; |
c5d79adb | 2341 | |
27c529bb | 2342 | mddev_unlock(my_mddev); |
29ac4aa3 | 2343 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2344 | mdk_rdev_t *rdev2; |
2345 | ||
2346 | mddev_lock(mddev); | |
159ec1fc | 2347 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2348 | if (test_bit(AllReserved, &rdev2->flags) || |
2349 | (rdev->bdev == rdev2->bdev && | |
2350 | rdev != rdev2 && | |
dd8ac336 | 2351 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2352 | rdev2->data_offset, |
dd8ac336 | 2353 | rdev2->sectors))) { |
c5d79adb N |
2354 | overlap = 1; |
2355 | break; | |
2356 | } | |
2357 | mddev_unlock(mddev); | |
2358 | if (overlap) { | |
2359 | mddev_put(mddev); | |
2360 | break; | |
2361 | } | |
2362 | } | |
27c529bb | 2363 | mddev_lock(my_mddev); |
c5d79adb N |
2364 | if (overlap) { |
2365 | /* Someone else could have slipped in a size | |
2366 | * change here, but doing so is just silly. | |
dd8ac336 | 2367 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2368 | * safe, and trust userspace not to race with |
2369 | * itself | |
2370 | */ | |
dd8ac336 | 2371 | rdev->sectors = oldsectors; |
c5d79adb N |
2372 | return -EBUSY; |
2373 | } | |
2374 | } | |
83303b61 N |
2375 | return len; |
2376 | } | |
2377 | ||
2378 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2379 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2380 | |
86e6ffdd N |
2381 | static struct attribute *rdev_default_attrs[] = { |
2382 | &rdev_state.attr, | |
4dbcdc75 | 2383 | &rdev_errors.attr, |
014236d2 | 2384 | &rdev_slot.attr, |
93c8cad0 | 2385 | &rdev_offset.attr, |
83303b61 | 2386 | &rdev_size.attr, |
86e6ffdd N |
2387 | NULL, |
2388 | }; | |
2389 | static ssize_t | |
2390 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2391 | { | |
2392 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2393 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2394 | mddev_t *mddev = rdev->mddev; |
2395 | ssize_t rv; | |
86e6ffdd N |
2396 | |
2397 | if (!entry->show) | |
2398 | return -EIO; | |
27c529bb N |
2399 | |
2400 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2401 | if (!rv) { | |
2402 | if (rdev->mddev == NULL) | |
2403 | rv = -EBUSY; | |
2404 | else | |
2405 | rv = entry->show(rdev, page); | |
2406 | mddev_unlock(mddev); | |
2407 | } | |
2408 | return rv; | |
86e6ffdd N |
2409 | } |
2410 | ||
2411 | static ssize_t | |
2412 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2413 | const char *page, size_t length) | |
2414 | { | |
2415 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2416 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2417 | ssize_t rv; |
2418 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2419 | |
2420 | if (!entry->store) | |
2421 | return -EIO; | |
67463acb N |
2422 | if (!capable(CAP_SYS_ADMIN)) |
2423 | return -EACCES; | |
27c529bb | 2424 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2425 | if (!rv) { |
27c529bb N |
2426 | if (rdev->mddev == NULL) |
2427 | rv = -EBUSY; | |
2428 | else | |
2429 | rv = entry->store(rdev, page, length); | |
6a51830e | 2430 | mddev_unlock(mddev); |
ca388059 N |
2431 | } |
2432 | return rv; | |
86e6ffdd N |
2433 | } |
2434 | ||
2435 | static void rdev_free(struct kobject *ko) | |
2436 | { | |
2437 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2438 | kfree(rdev); | |
2439 | } | |
2440 | static struct sysfs_ops rdev_sysfs_ops = { | |
2441 | .show = rdev_attr_show, | |
2442 | .store = rdev_attr_store, | |
2443 | }; | |
2444 | static struct kobj_type rdev_ktype = { | |
2445 | .release = rdev_free, | |
2446 | .sysfs_ops = &rdev_sysfs_ops, | |
2447 | .default_attrs = rdev_default_attrs, | |
2448 | }; | |
2449 | ||
1da177e4 LT |
2450 | /* |
2451 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2452 | * | |
2453 | * mark the device faulty if: | |
2454 | * | |
2455 | * - the device is nonexistent (zero size) | |
2456 | * - the device has no valid superblock | |
2457 | * | |
2458 | * a faulty rdev _never_ has rdev->sb set. | |
2459 | */ | |
2460 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2461 | { | |
2462 | char b[BDEVNAME_SIZE]; | |
2463 | int err; | |
2464 | mdk_rdev_t *rdev; | |
2465 | sector_t size; | |
2466 | ||
9ffae0cf | 2467 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2468 | if (!rdev) { |
2469 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2470 | return ERR_PTR(-ENOMEM); | |
2471 | } | |
1da177e4 LT |
2472 | |
2473 | if ((err = alloc_disk_sb(rdev))) | |
2474 | goto abort_free; | |
2475 | ||
c5d79adb | 2476 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2477 | if (err) |
2478 | goto abort_free; | |
2479 | ||
f9cb074b | 2480 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2481 | |
1da177e4 | 2482 | rdev->desc_nr = -1; |
2b6e8459 | 2483 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2484 | rdev->raid_disk = -1; |
b2d444d7 | 2485 | rdev->flags = 0; |
1da177e4 | 2486 | rdev->data_offset = 0; |
42543769 | 2487 | rdev->sb_events = 0; |
1da177e4 | 2488 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2489 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2490 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2491 | |
2492 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2493 | if (!size) { | |
2494 | printk(KERN_WARNING | |
2495 | "md: %s has zero or unknown size, marking faulty!\n", | |
2496 | bdevname(rdev->bdev,b)); | |
2497 | err = -EINVAL; | |
2498 | goto abort_free; | |
2499 | } | |
2500 | ||
2501 | if (super_format >= 0) { | |
2502 | err = super_types[super_format]. | |
2503 | load_super(rdev, NULL, super_minor); | |
2504 | if (err == -EINVAL) { | |
df968c4e N |
2505 | printk(KERN_WARNING |
2506 | "md: %s does not have a valid v%d.%d " | |
2507 | "superblock, not importing!\n", | |
2508 | bdevname(rdev->bdev,b), | |
2509 | super_format, super_minor); | |
1da177e4 LT |
2510 | goto abort_free; |
2511 | } | |
2512 | if (err < 0) { | |
2513 | printk(KERN_WARNING | |
2514 | "md: could not read %s's sb, not importing!\n", | |
2515 | bdevname(rdev->bdev,b)); | |
2516 | goto abort_free; | |
2517 | } | |
2518 | } | |
6bfe0b49 | 2519 | |
1da177e4 | 2520 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2521 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2522 | |
2523 | return rdev; | |
2524 | ||
2525 | abort_free: | |
2526 | if (rdev->sb_page) { | |
2527 | if (rdev->bdev) | |
2528 | unlock_rdev(rdev); | |
2529 | free_disk_sb(rdev); | |
2530 | } | |
2531 | kfree(rdev); | |
2532 | return ERR_PTR(err); | |
2533 | } | |
2534 | ||
2535 | /* | |
2536 | * Check a full RAID array for plausibility | |
2537 | */ | |
2538 | ||
2539 | ||
a757e64c | 2540 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2541 | { |
2542 | int i; | |
159ec1fc | 2543 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2544 | char b[BDEVNAME_SIZE]; |
2545 | ||
2546 | freshest = NULL; | |
d089c6af | 2547 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2548 | switch (super_types[mddev->major_version]. |
2549 | load_super(rdev, freshest, mddev->minor_version)) { | |
2550 | case 1: | |
2551 | freshest = rdev; | |
2552 | break; | |
2553 | case 0: | |
2554 | break; | |
2555 | default: | |
2556 | printk( KERN_ERR \ | |
2557 | "md: fatal superblock inconsistency in %s" | |
2558 | " -- removing from array\n", | |
2559 | bdevname(rdev->bdev,b)); | |
2560 | kick_rdev_from_array(rdev); | |
2561 | } | |
2562 | ||
2563 | ||
2564 | super_types[mddev->major_version]. | |
2565 | validate_super(mddev, freshest); | |
2566 | ||
2567 | i = 0; | |
d089c6af | 2568 | rdev_for_each(rdev, tmp, mddev) { |
de01dfad N |
2569 | if (rdev->desc_nr >= mddev->max_disks || |
2570 | i > mddev->max_disks) { | |
2571 | printk(KERN_WARNING | |
2572 | "md: %s: %s: only %d devices permitted\n", | |
2573 | mdname(mddev), bdevname(rdev->bdev, b), | |
2574 | mddev->max_disks); | |
2575 | kick_rdev_from_array(rdev); | |
2576 | continue; | |
2577 | } | |
1da177e4 LT |
2578 | if (rdev != freshest) |
2579 | if (super_types[mddev->major_version]. | |
2580 | validate_super(mddev, rdev)) { | |
2581 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2582 | " from array!\n", | |
2583 | bdevname(rdev->bdev,b)); | |
2584 | kick_rdev_from_array(rdev); | |
2585 | continue; | |
2586 | } | |
2587 | if (mddev->level == LEVEL_MULTIPATH) { | |
2588 | rdev->desc_nr = i++; | |
2589 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2590 | set_bit(In_sync, &rdev->flags); |
a778b73f N |
2591 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
2592 | rdev->raid_disk = -1; | |
2593 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2594 | } |
2595 | } | |
2596 | ||
2597 | ||
2598 | ||
2599 | if (mddev->recovery_cp != MaxSector && | |
2600 | mddev->level >= 1) | |
2601 | printk(KERN_ERR "md: %s: raid array is not clean" | |
2602 | " -- starting background reconstruction\n", | |
2603 | mdname(mddev)); | |
2604 | ||
1da177e4 LT |
2605 | } |
2606 | ||
19052c0e N |
2607 | static void md_safemode_timeout(unsigned long data); |
2608 | ||
16f17b39 N |
2609 | static ssize_t |
2610 | safe_delay_show(mddev_t *mddev, char *page) | |
2611 | { | |
2612 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2613 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2614 | } | |
2615 | static ssize_t | |
2616 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2617 | { | |
2618 | int scale=1; | |
2619 | int dot=0; | |
2620 | int i; | |
2621 | unsigned long msec; | |
2622 | char buf[30]; | |
97ce0a7f | 2623 | |
16f17b39 N |
2624 | /* remove a period, and count digits after it */ |
2625 | if (len >= sizeof(buf)) | |
2626 | return -EINVAL; | |
97ce0a7f | 2627 | strlcpy(buf, cbuf, sizeof(buf)); |
16f17b39 N |
2628 | for (i=0; i<len; i++) { |
2629 | if (dot) { | |
2630 | if (isdigit(buf[i])) { | |
2631 | buf[i-1] = buf[i]; | |
2632 | scale *= 10; | |
2633 | } | |
2634 | buf[i] = 0; | |
2635 | } else if (buf[i] == '.') { | |
2636 | dot=1; | |
2637 | buf[i] = 0; | |
2638 | } | |
2639 | } | |
97ce0a7f | 2640 | if (strict_strtoul(buf, 10, &msec) < 0) |
16f17b39 N |
2641 | return -EINVAL; |
2642 | msec = (msec * 1000) / scale; | |
2643 | if (msec == 0) | |
2644 | mddev->safemode_delay = 0; | |
2645 | else { | |
19052c0e | 2646 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2647 | mddev->safemode_delay = (msec*HZ)/1000; |
2648 | if (mddev->safemode_delay == 0) | |
2649 | mddev->safemode_delay = 1; | |
19052c0e N |
2650 | if (mddev->safemode_delay < old_delay) |
2651 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2652 | } |
2653 | return len; | |
2654 | } | |
2655 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2656 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2657 | |
eae1701f | 2658 | static ssize_t |
96de1e66 | 2659 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2660 | { |
2604b703 | 2661 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2662 | if (p) |
eae1701f | 2663 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2664 | else if (mddev->clevel[0]) |
2665 | return sprintf(page, "%s\n", mddev->clevel); | |
2666 | else if (mddev->level != LEVEL_NONE) | |
2667 | return sprintf(page, "%d\n", mddev->level); | |
2668 | else | |
2669 | return 0; | |
eae1701f N |
2670 | } |
2671 | ||
d9d166c2 N |
2672 | static ssize_t |
2673 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2674 | { | |
245f46c2 | 2675 | char level[16]; |
20a49ff6 | 2676 | ssize_t rv = len; |
245f46c2 N |
2677 | struct mdk_personality *pers; |
2678 | void *priv; | |
2679 | ||
2680 | if (mddev->pers == NULL) { | |
2681 | if (len == 0) | |
2682 | return 0; | |
2683 | if (len >= sizeof(mddev->clevel)) | |
2684 | return -ENOSPC; | |
2685 | strncpy(mddev->clevel, buf, len); | |
2686 | if (mddev->clevel[len-1] == '\n') | |
2687 | len--; | |
2688 | mddev->clevel[len] = 0; | |
2689 | mddev->level = LEVEL_NONE; | |
2690 | return rv; | |
2691 | } | |
2692 | ||
2693 | /* request to change the personality. Need to ensure: | |
2694 | * - array is not engaged in resync/recovery/reshape | |
2695 | * - old personality can be suspended | |
2696 | * - new personality will access other array. | |
2697 | */ | |
2698 | ||
2699 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) | |
d9d166c2 | 2700 | return -EBUSY; |
245f46c2 N |
2701 | |
2702 | if (!mddev->pers->quiesce) { | |
2703 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
2704 | mdname(mddev), mddev->pers->name); | |
2705 | return -EINVAL; | |
2706 | } | |
2707 | ||
2708 | /* Now find the new personality */ | |
2709 | if (len == 0 || len >= sizeof(level)) | |
2710 | return -EINVAL; | |
2711 | strncpy(level, buf, len); | |
2712 | if (level[len-1] == '\n') | |
d9d166c2 | 2713 | len--; |
245f46c2 N |
2714 | level[len] = 0; |
2715 | ||
2716 | request_module("md-%s", level); | |
2717 | spin_lock(&pers_lock); | |
2718 | pers = find_pers(LEVEL_NONE, level); | |
2719 | if (!pers || !try_module_get(pers->owner)) { | |
2720 | spin_unlock(&pers_lock); | |
2721 | printk(KERN_WARNING "md: personality %s not loaded\n", level); | |
2722 | return -EINVAL; | |
2723 | } | |
2724 | spin_unlock(&pers_lock); | |
2725 | ||
2726 | if (pers == mddev->pers) { | |
2727 | /* Nothing to do! */ | |
2728 | module_put(pers->owner); | |
2729 | return rv; | |
2730 | } | |
2731 | if (!pers->takeover) { | |
2732 | module_put(pers->owner); | |
2733 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
2734 | mdname(mddev), level); | |
2735 | return -EINVAL; | |
2736 | } | |
2737 | ||
2738 | /* ->takeover must set new_* and/or delta_disks | |
2739 | * if it succeeds, and may set them when it fails. | |
2740 | */ | |
2741 | priv = pers->takeover(mddev); | |
2742 | if (IS_ERR(priv)) { | |
2743 | mddev->new_level = mddev->level; | |
2744 | mddev->new_layout = mddev->layout; | |
2745 | mddev->new_chunk = mddev->chunk_size; | |
2746 | mddev->raid_disks -= mddev->delta_disks; | |
2747 | mddev->delta_disks = 0; | |
2748 | module_put(pers->owner); | |
2749 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
2750 | mdname(mddev), level); | |
2751 | return PTR_ERR(priv); | |
2752 | } | |
2753 | ||
2754 | /* Looks like we have a winner */ | |
2755 | mddev_suspend(mddev); | |
2756 | mddev->pers->stop(mddev); | |
2757 | module_put(mddev->pers->owner); | |
2758 | mddev->pers = pers; | |
2759 | mddev->private = priv; | |
2760 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
2761 | mddev->level = mddev->new_level; | |
2762 | mddev->layout = mddev->new_layout; | |
2763 | mddev->chunk_size = mddev->new_chunk; | |
2764 | mddev->delta_disks = 0; | |
2765 | pers->run(mddev); | |
2766 | mddev_resume(mddev); | |
2767 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2768 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2769 | md_wakeup_thread(mddev->thread); | |
d9d166c2 N |
2770 | return rv; |
2771 | } | |
2772 | ||
2773 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2774 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2775 | |
d4dbd025 N |
2776 | |
2777 | static ssize_t | |
2778 | layout_show(mddev_t *mddev, char *page) | |
2779 | { | |
2780 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2781 | if (mddev->reshape_position != MaxSector && |
2782 | mddev->layout != mddev->new_layout) | |
2783 | return sprintf(page, "%d (%d)\n", | |
2784 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2785 | return sprintf(page, "%d\n", mddev->layout); |
2786 | } | |
2787 | ||
2788 | static ssize_t | |
2789 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2790 | { | |
2791 | char *e; | |
2792 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2793 | |
2794 | if (!*buf || (*e && *e != '\n')) | |
2795 | return -EINVAL; | |
2796 | ||
b3546035 N |
2797 | if (mddev->pers) { |
2798 | int err; | |
2799 | if (mddev->pers->reconfig == NULL) | |
2800 | return -EBUSY; | |
2801 | err = mddev->pers->reconfig(mddev, n, -1); | |
2802 | if (err) | |
2803 | return err; | |
2804 | } else { | |
2805 | mddev->new_layout = n; | |
2806 | if (mddev->reshape_position == MaxSector) | |
2807 | mddev->layout = n; | |
2808 | } | |
d4dbd025 N |
2809 | return len; |
2810 | } | |
2811 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 2812 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
2813 | |
2814 | ||
eae1701f | 2815 | static ssize_t |
96de1e66 | 2816 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 2817 | { |
bb636547 N |
2818 | if (mddev->raid_disks == 0) |
2819 | return 0; | |
08a02ecd N |
2820 | if (mddev->reshape_position != MaxSector && |
2821 | mddev->delta_disks != 0) | |
2822 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2823 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
2824 | return sprintf(page, "%d\n", mddev->raid_disks); |
2825 | } | |
2826 | ||
da943b99 N |
2827 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
2828 | ||
2829 | static ssize_t | |
2830 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2831 | { | |
da943b99 N |
2832 | char *e; |
2833 | int rv = 0; | |
2834 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2835 | ||
2836 | if (!*buf || (*e && *e != '\n')) | |
2837 | return -EINVAL; | |
2838 | ||
2839 | if (mddev->pers) | |
2840 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
2841 | else if (mddev->reshape_position != MaxSector) { |
2842 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2843 | mddev->delta_disks = n - olddisks; | |
2844 | mddev->raid_disks = n; | |
2845 | } else | |
da943b99 N |
2846 | mddev->raid_disks = n; |
2847 | return rv ? rv : len; | |
2848 | } | |
2849 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 2850 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 2851 | |
3b34380a N |
2852 | static ssize_t |
2853 | chunk_size_show(mddev_t *mddev, char *page) | |
2854 | { | |
08a02ecd N |
2855 | if (mddev->reshape_position != MaxSector && |
2856 | mddev->chunk_size != mddev->new_chunk) | |
2857 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, | |
2858 | mddev->chunk_size); | |
3b34380a N |
2859 | return sprintf(page, "%d\n", mddev->chunk_size); |
2860 | } | |
2861 | ||
2862 | static ssize_t | |
2863 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2864 | { | |
3b34380a N |
2865 | char *e; |
2866 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2867 | ||
3b34380a N |
2868 | if (!*buf || (*e && *e != '\n')) |
2869 | return -EINVAL; | |
2870 | ||
b3546035 N |
2871 | if (mddev->pers) { |
2872 | int err; | |
2873 | if (mddev->pers->reconfig == NULL) | |
2874 | return -EBUSY; | |
2875 | err = mddev->pers->reconfig(mddev, -1, n); | |
2876 | if (err) | |
2877 | return err; | |
2878 | } else { | |
2879 | mddev->new_chunk = n; | |
2880 | if (mddev->reshape_position == MaxSector) | |
2881 | mddev->chunk_size = n; | |
2882 | } | |
3b34380a N |
2883 | return len; |
2884 | } | |
2885 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 2886 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 2887 | |
a94213b1 N |
2888 | static ssize_t |
2889 | resync_start_show(mddev_t *mddev, char *page) | |
2890 | { | |
2891 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2892 | } | |
2893 | ||
2894 | static ssize_t | |
2895 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2896 | { | |
a94213b1 N |
2897 | char *e; |
2898 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2899 | ||
2900 | if (mddev->pers) | |
2901 | return -EBUSY; | |
2902 | if (!*buf || (*e && *e != '\n')) | |
2903 | return -EINVAL; | |
2904 | ||
2905 | mddev->recovery_cp = n; | |
2906 | return len; | |
2907 | } | |
2908 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 2909 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 2910 | |
9e653b63 N |
2911 | /* |
2912 | * The array state can be: | |
2913 | * | |
2914 | * clear | |
2915 | * No devices, no size, no level | |
2916 | * Equivalent to STOP_ARRAY ioctl | |
2917 | * inactive | |
2918 | * May have some settings, but array is not active | |
2919 | * all IO results in error | |
2920 | * When written, doesn't tear down array, but just stops it | |
2921 | * suspended (not supported yet) | |
2922 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 2923 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
2924 | * readonly |
2925 | * no resync can happen. no superblocks get written. | |
2926 | * write requests fail | |
2927 | * read-auto | |
2928 | * like readonly, but behaves like 'clean' on a write request. | |
2929 | * | |
2930 | * clean - no pending writes, but otherwise active. | |
2931 | * When written to inactive array, starts without resync | |
2932 | * If a write request arrives then | |
2933 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
2934 | * if not known, block and switch to write-pending | |
2935 | * If written to an active array that has pending writes, then fails. | |
2936 | * active | |
2937 | * fully active: IO and resync can be happening. | |
2938 | * When written to inactive array, starts with resync | |
2939 | * | |
2940 | * write-pending | |
2941 | * clean, but writes are blocked waiting for 'active' to be written. | |
2942 | * | |
2943 | * active-idle | |
2944 | * like active, but no writes have been seen for a while (100msec). | |
2945 | * | |
2946 | */ | |
2947 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
2948 | write_pending, active_idle, bad_word}; | |
05381954 | 2949 | static char *array_states[] = { |
9e653b63 N |
2950 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
2951 | "write-pending", "active-idle", NULL }; | |
2952 | ||
2953 | static int match_word(const char *word, char **list) | |
2954 | { | |
2955 | int n; | |
2956 | for (n=0; list[n]; n++) | |
2957 | if (cmd_match(word, list[n])) | |
2958 | break; | |
2959 | return n; | |
2960 | } | |
2961 | ||
2962 | static ssize_t | |
2963 | array_state_show(mddev_t *mddev, char *page) | |
2964 | { | |
2965 | enum array_state st = inactive; | |
2966 | ||
2967 | if (mddev->pers) | |
2968 | switch(mddev->ro) { | |
2969 | case 1: | |
2970 | st = readonly; | |
2971 | break; | |
2972 | case 2: | |
2973 | st = read_auto; | |
2974 | break; | |
2975 | case 0: | |
2976 | if (mddev->in_sync) | |
2977 | st = clean; | |
e691063a N |
2978 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
2979 | st = write_pending; | |
9e653b63 N |
2980 | else if (mddev->safemode) |
2981 | st = active_idle; | |
2982 | else | |
2983 | st = active; | |
2984 | } | |
2985 | else { | |
2986 | if (list_empty(&mddev->disks) && | |
2987 | mddev->raid_disks == 0 && | |
58c0fed4 | 2988 | mddev->dev_sectors == 0) |
9e653b63 N |
2989 | st = clear; |
2990 | else | |
2991 | st = inactive; | |
2992 | } | |
2993 | return sprintf(page, "%s\n", array_states[st]); | |
2994 | } | |
2995 | ||
df5b20cf | 2996 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
2997 | static int do_md_run(mddev_t * mddev); |
2998 | static int restart_array(mddev_t *mddev); | |
2999 | ||
3000 | static ssize_t | |
3001 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3002 | { | |
3003 | int err = -EINVAL; | |
3004 | enum array_state st = match_word(buf, array_states); | |
3005 | switch(st) { | |
3006 | case bad_word: | |
3007 | break; | |
3008 | case clear: | |
3009 | /* stopping an active array */ | |
f2ea68cf | 3010 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3011 | return -EBUSY; |
df5b20cf | 3012 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3013 | break; |
3014 | case inactive: | |
3015 | /* stopping an active array */ | |
3016 | if (mddev->pers) { | |
f2ea68cf | 3017 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3018 | return -EBUSY; |
df5b20cf | 3019 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3020 | } else |
3021 | err = 0; /* already inactive */ | |
9e653b63 N |
3022 | break; |
3023 | case suspended: | |
3024 | break; /* not supported yet */ | |
3025 | case readonly: | |
3026 | if (mddev->pers) | |
df5b20cf | 3027 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
3028 | else { |
3029 | mddev->ro = 1; | |
648b629e | 3030 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3031 | err = do_md_run(mddev); |
3032 | } | |
3033 | break; | |
3034 | case read_auto: | |
9e653b63 | 3035 | if (mddev->pers) { |
80268ee9 | 3036 | if (mddev->ro == 0) |
df5b20cf | 3037 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 3038 | else if (mddev->ro == 1) |
648b629e N |
3039 | err = restart_array(mddev); |
3040 | if (err == 0) { | |
3041 | mddev->ro = 2; | |
3042 | set_disk_ro(mddev->gendisk, 0); | |
3043 | } | |
9e653b63 N |
3044 | } else { |
3045 | mddev->ro = 2; | |
3046 | err = do_md_run(mddev); | |
3047 | } | |
3048 | break; | |
3049 | case clean: | |
3050 | if (mddev->pers) { | |
3051 | restart_array(mddev); | |
3052 | spin_lock_irq(&mddev->write_lock); | |
3053 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3054 | if (mddev->in_sync == 0) { |
3055 | mddev->in_sync = 1; | |
31a59e34 N |
3056 | if (mddev->safemode == 1) |
3057 | mddev->safemode = 0; | |
e691063a N |
3058 | if (mddev->persistent) |
3059 | set_bit(MD_CHANGE_CLEAN, | |
3060 | &mddev->flags); | |
3061 | } | |
3062 | err = 0; | |
3063 | } else | |
3064 | err = -EBUSY; | |
9e653b63 N |
3065 | spin_unlock_irq(&mddev->write_lock); |
3066 | } else { | |
3067 | mddev->ro = 0; | |
3068 | mddev->recovery_cp = MaxSector; | |
3069 | err = do_md_run(mddev); | |
3070 | } | |
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; | |
9687a60c AN |
3472 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3473 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3474 | if (!dt) dt++; |
9687a60c AN |
3475 | db = resync - mddev->resync_mark_cnt; |
3476 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3477 | } |
3478 | ||
80ca3a44 | 3479 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3480 | |
3481 | static ssize_t | |
3482 | sync_completed_show(mddev_t *mddev, char *page) | |
3483 | { | |
58c0fed4 | 3484 | unsigned long max_sectors, resync; |
88202a0c N |
3485 | |
3486 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
58c0fed4 | 3487 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3488 | else |
58c0fed4 | 3489 | max_sectors = mddev->dev_sectors; |
88202a0c N |
3490 | |
3491 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
58c0fed4 | 3492 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3493 | } |
3494 | ||
80ca3a44 | 3495 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3496 | |
5e96ee65 NB |
3497 | static ssize_t |
3498 | min_sync_show(mddev_t *mddev, char *page) | |
3499 | { | |
3500 | return sprintf(page, "%llu\n", | |
3501 | (unsigned long long)mddev->resync_min); | |
3502 | } | |
3503 | static ssize_t | |
3504 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3505 | { | |
3506 | unsigned long long min; | |
3507 | if (strict_strtoull(buf, 10, &min)) | |
3508 | return -EINVAL; | |
3509 | if (min > mddev->resync_max) | |
3510 | return -EINVAL; | |
3511 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3512 | return -EBUSY; | |
3513 | ||
3514 | /* Must be a multiple of chunk_size */ | |
3515 | if (mddev->chunk_size) { | |
3516 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) | |
3517 | return -EINVAL; | |
3518 | } | |
3519 | mddev->resync_min = min; | |
3520 | ||
3521 | return len; | |
3522 | } | |
3523 | ||
3524 | static struct md_sysfs_entry md_min_sync = | |
3525 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3526 | ||
c6207277 N |
3527 | static ssize_t |
3528 | max_sync_show(mddev_t *mddev, char *page) | |
3529 | { | |
3530 | if (mddev->resync_max == MaxSector) | |
3531 | return sprintf(page, "max\n"); | |
3532 | else | |
3533 | return sprintf(page, "%llu\n", | |
3534 | (unsigned long long)mddev->resync_max); | |
3535 | } | |
3536 | static ssize_t | |
3537 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3538 | { | |
3539 | if (strncmp(buf, "max", 3) == 0) | |
3540 | mddev->resync_max = MaxSector; | |
3541 | else { | |
5e96ee65 NB |
3542 | unsigned long long max; |
3543 | if (strict_strtoull(buf, 10, &max)) | |
3544 | return -EINVAL; | |
3545 | if (max < mddev->resync_min) | |
c6207277 N |
3546 | return -EINVAL; |
3547 | if (max < mddev->resync_max && | |
3548 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3549 | return -EBUSY; | |
3550 | ||
3551 | /* Must be a multiple of chunk_size */ | |
3552 | if (mddev->chunk_size) { | |
3553 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) | |
3554 | return -EINVAL; | |
3555 | } | |
3556 | mddev->resync_max = max; | |
3557 | } | |
3558 | wake_up(&mddev->recovery_wait); | |
3559 | return len; | |
3560 | } | |
3561 | ||
3562 | static struct md_sysfs_entry md_max_sync = | |
3563 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3564 | ||
e464eafd N |
3565 | static ssize_t |
3566 | suspend_lo_show(mddev_t *mddev, char *page) | |
3567 | { | |
3568 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3569 | } | |
3570 | ||
3571 | static ssize_t | |
3572 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3573 | { | |
3574 | char *e; | |
3575 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3576 | ||
3577 | if (mddev->pers->quiesce == NULL) | |
3578 | return -EINVAL; | |
3579 | if (buf == e || (*e && *e != '\n')) | |
3580 | return -EINVAL; | |
3581 | if (new >= mddev->suspend_hi || | |
3582 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3583 | mddev->suspend_lo = new; | |
3584 | mddev->pers->quiesce(mddev, 2); | |
3585 | return len; | |
3586 | } else | |
3587 | return -EINVAL; | |
3588 | } | |
3589 | static struct md_sysfs_entry md_suspend_lo = | |
3590 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3591 | ||
3592 | ||
3593 | static ssize_t | |
3594 | suspend_hi_show(mddev_t *mddev, char *page) | |
3595 | { | |
3596 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3597 | } | |
3598 | ||
3599 | static ssize_t | |
3600 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3601 | { | |
3602 | char *e; | |
3603 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3604 | ||
3605 | if (mddev->pers->quiesce == NULL) | |
3606 | return -EINVAL; | |
3607 | if (buf == e || (*e && *e != '\n')) | |
3608 | return -EINVAL; | |
3609 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3610 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3611 | mddev->suspend_hi = new; | |
3612 | mddev->pers->quiesce(mddev, 1); | |
3613 | mddev->pers->quiesce(mddev, 0); | |
3614 | return len; | |
3615 | } else | |
3616 | return -EINVAL; | |
3617 | } | |
3618 | static struct md_sysfs_entry md_suspend_hi = | |
3619 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3620 | ||
08a02ecd N |
3621 | static ssize_t |
3622 | reshape_position_show(mddev_t *mddev, char *page) | |
3623 | { | |
3624 | if (mddev->reshape_position != MaxSector) | |
3625 | return sprintf(page, "%llu\n", | |
3626 | (unsigned long long)mddev->reshape_position); | |
3627 | strcpy(page, "none\n"); | |
3628 | return 5; | |
3629 | } | |
3630 | ||
3631 | static ssize_t | |
3632 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3633 | { | |
3634 | char *e; | |
3635 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3636 | if (mddev->pers) | |
3637 | return -EBUSY; | |
3638 | if (buf == e || (*e && *e != '\n')) | |
3639 | return -EINVAL; | |
3640 | mddev->reshape_position = new; | |
3641 | mddev->delta_disks = 0; | |
3642 | mddev->new_level = mddev->level; | |
3643 | mddev->new_layout = mddev->layout; | |
3644 | mddev->new_chunk = mddev->chunk_size; | |
3645 | return len; | |
3646 | } | |
3647 | ||
3648 | static struct md_sysfs_entry md_reshape_position = | |
3649 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3650 | reshape_position_store); | |
3651 | ||
b522adcd DW |
3652 | static ssize_t |
3653 | array_size_show(mddev_t *mddev, char *page) | |
3654 | { | |
3655 | if (mddev->external_size) | |
3656 | return sprintf(page, "%llu\n", | |
3657 | (unsigned long long)mddev->array_sectors/2); | |
3658 | else | |
3659 | return sprintf(page, "default\n"); | |
3660 | } | |
3661 | ||
3662 | static ssize_t | |
3663 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3664 | { | |
3665 | sector_t sectors; | |
3666 | ||
3667 | if (strncmp(buf, "default", 7) == 0) { | |
3668 | if (mddev->pers) | |
3669 | sectors = mddev->pers->size(mddev, 0, 0); | |
3670 | else | |
3671 | sectors = mddev->array_sectors; | |
3672 | ||
3673 | mddev->external_size = 0; | |
3674 | } else { | |
3675 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
3676 | return -EINVAL; | |
3677 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
3678 | return -EINVAL; | |
3679 | ||
3680 | mddev->external_size = 1; | |
3681 | } | |
3682 | ||
3683 | mddev->array_sectors = sectors; | |
3684 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
3685 | if (mddev->pers) { | |
3686 | struct block_device *bdev = bdget_disk(mddev->gendisk, 0); | |
3687 | ||
3688 | if (bdev) { | |
3689 | mutex_lock(&bdev->bd_inode->i_mutex); | |
3690 | i_size_write(bdev->bd_inode, | |
3691 | (loff_t)mddev->array_sectors << 9); | |
3692 | mutex_unlock(&bdev->bd_inode->i_mutex); | |
3693 | bdput(bdev); | |
3694 | } | |
3695 | } | |
3696 | ||
3697 | return len; | |
3698 | } | |
3699 | ||
3700 | static struct md_sysfs_entry md_array_size = | |
3701 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
3702 | array_size_store); | |
e464eafd | 3703 | |
eae1701f N |
3704 | static struct attribute *md_default_attrs[] = { |
3705 | &md_level.attr, | |
d4dbd025 | 3706 | &md_layout.attr, |
eae1701f | 3707 | &md_raid_disks.attr, |
3b34380a | 3708 | &md_chunk_size.attr, |
a35b0d69 | 3709 | &md_size.attr, |
a94213b1 | 3710 | &md_resync_start.attr, |
8bb93aac | 3711 | &md_metadata.attr, |
6d7ff738 | 3712 | &md_new_device.attr, |
16f17b39 | 3713 | &md_safe_delay.attr, |
9e653b63 | 3714 | &md_array_state.attr, |
08a02ecd | 3715 | &md_reshape_position.attr, |
b522adcd | 3716 | &md_array_size.attr, |
411036fa N |
3717 | NULL, |
3718 | }; | |
3719 | ||
3720 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3721 | &md_scan_mode.attr, |
9d88883e | 3722 | &md_mismatches.attr, |
88202a0c N |
3723 | &md_sync_min.attr, |
3724 | &md_sync_max.attr, | |
3725 | &md_sync_speed.attr, | |
90b08710 | 3726 | &md_sync_force_parallel.attr, |
88202a0c | 3727 | &md_sync_completed.attr, |
5e96ee65 | 3728 | &md_min_sync.attr, |
c6207277 | 3729 | &md_max_sync.attr, |
e464eafd N |
3730 | &md_suspend_lo.attr, |
3731 | &md_suspend_hi.attr, | |
9b1d1dac | 3732 | &md_bitmap.attr, |
d7f3d291 | 3733 | &md_degraded.attr, |
eae1701f N |
3734 | NULL, |
3735 | }; | |
411036fa N |
3736 | static struct attribute_group md_redundancy_group = { |
3737 | .name = NULL, | |
3738 | .attrs = md_redundancy_attrs, | |
3739 | }; | |
3740 | ||
eae1701f N |
3741 | |
3742 | static ssize_t | |
3743 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3744 | { | |
3745 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3746 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3747 | ssize_t rv; |
eae1701f N |
3748 | |
3749 | if (!entry->show) | |
3750 | return -EIO; | |
5dc5cf7d IM |
3751 | rv = mddev_lock(mddev); |
3752 | if (!rv) { | |
3753 | rv = entry->show(mddev, page); | |
3754 | mddev_unlock(mddev); | |
3755 | } | |
96de1e66 | 3756 | return rv; |
eae1701f N |
3757 | } |
3758 | ||
3759 | static ssize_t | |
3760 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3761 | const char *page, size_t length) | |
3762 | { | |
3763 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3764 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3765 | ssize_t rv; |
eae1701f N |
3766 | |
3767 | if (!entry->store) | |
3768 | return -EIO; | |
67463acb N |
3769 | if (!capable(CAP_SYS_ADMIN)) |
3770 | return -EACCES; | |
5dc5cf7d | 3771 | rv = mddev_lock(mddev); |
d3374825 N |
3772 | if (mddev->hold_active == UNTIL_IOCTL) |
3773 | mddev->hold_active = 0; | |
5dc5cf7d IM |
3774 | if (!rv) { |
3775 | rv = entry->store(mddev, page, length); | |
3776 | mddev_unlock(mddev); | |
3777 | } | |
96de1e66 | 3778 | return rv; |
eae1701f N |
3779 | } |
3780 | ||
3781 | static void md_free(struct kobject *ko) | |
3782 | { | |
3783 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
3784 | |
3785 | if (mddev->sysfs_state) | |
3786 | sysfs_put(mddev->sysfs_state); | |
3787 | ||
3788 | if (mddev->gendisk) { | |
3789 | del_gendisk(mddev->gendisk); | |
3790 | put_disk(mddev->gendisk); | |
3791 | } | |
3792 | if (mddev->queue) | |
3793 | blk_cleanup_queue(mddev->queue); | |
3794 | ||
eae1701f N |
3795 | kfree(mddev); |
3796 | } | |
3797 | ||
3798 | static struct sysfs_ops md_sysfs_ops = { | |
3799 | .show = md_attr_show, | |
3800 | .store = md_attr_store, | |
3801 | }; | |
3802 | static struct kobj_type md_ktype = { | |
3803 | .release = md_free, | |
3804 | .sysfs_ops = &md_sysfs_ops, | |
3805 | .default_attrs = md_default_attrs, | |
3806 | }; | |
3807 | ||
1da177e4 LT |
3808 | int mdp_major = 0; |
3809 | ||
efeb53c0 | 3810 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 3811 | { |
48c9c27b | 3812 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
3813 | mddev_t *mddev = mddev_find(dev); |
3814 | struct gendisk *disk; | |
efeb53c0 N |
3815 | int partitioned; |
3816 | int shift; | |
3817 | int unit; | |
3830c62f | 3818 | int error; |
1da177e4 LT |
3819 | |
3820 | if (!mddev) | |
efeb53c0 N |
3821 | return -ENODEV; |
3822 | ||
3823 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
3824 | shift = partitioned ? MdpMinorShift : 0; | |
3825 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 3826 | |
d3374825 N |
3827 | /* wait for any previous instance if this device |
3828 | * to be completed removed (mddev_delayed_delete). | |
3829 | */ | |
3830 | flush_scheduled_work(); | |
3831 | ||
48c9c27b | 3832 | mutex_lock(&disks_mutex); |
1da177e4 | 3833 | if (mddev->gendisk) { |
48c9c27b | 3834 | mutex_unlock(&disks_mutex); |
1da177e4 | 3835 | mddev_put(mddev); |
efeb53c0 N |
3836 | return -EEXIST; |
3837 | } | |
3838 | ||
3839 | if (name) { | |
3840 | /* Need to ensure that 'name' is not a duplicate. | |
3841 | */ | |
3842 | mddev_t *mddev2; | |
3843 | spin_lock(&all_mddevs_lock); | |
3844 | ||
3845 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
3846 | if (mddev2->gendisk && | |
3847 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
3848 | spin_unlock(&all_mddevs_lock); | |
3849 | return -EEXIST; | |
3850 | } | |
3851 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 3852 | } |
8b765398 N |
3853 | |
3854 | mddev->queue = blk_alloc_queue(GFP_KERNEL); | |
3855 | if (!mddev->queue) { | |
3856 | mutex_unlock(&disks_mutex); | |
3857 | mddev_put(mddev); | |
efeb53c0 | 3858 | return -ENOMEM; |
8b765398 | 3859 | } |
409c57f3 N |
3860 | mddev->queue->queuedata = mddev; |
3861 | ||
8b765398 N |
3862 | /* Can be unlocked because the queue is new: no concurrency */ |
3863 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
3864 | ||
409c57f3 | 3865 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 3866 | |
1da177e4 LT |
3867 | disk = alloc_disk(1 << shift); |
3868 | if (!disk) { | |
48c9c27b | 3869 | mutex_unlock(&disks_mutex); |
8b765398 N |
3870 | blk_cleanup_queue(mddev->queue); |
3871 | mddev->queue = NULL; | |
1da177e4 | 3872 | mddev_put(mddev); |
efeb53c0 | 3873 | return -ENOMEM; |
1da177e4 | 3874 | } |
efeb53c0 | 3875 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 3876 | disk->first_minor = unit << shift; |
efeb53c0 N |
3877 | if (name) |
3878 | strcpy(disk->disk_name, name); | |
3879 | else if (partitioned) | |
1da177e4 | 3880 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 3881 | else |
1da177e4 | 3882 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
3883 | disk->fops = &md_fops; |
3884 | disk->private_data = mddev; | |
3885 | disk->queue = mddev->queue; | |
92850bbd | 3886 | /* Allow extended partitions. This makes the |
d3374825 | 3887 | * 'mdp' device redundant, but we can't really |
92850bbd N |
3888 | * remove it now. |
3889 | */ | |
3890 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
3891 | add_disk(disk); |
3892 | mddev->gendisk = disk; | |
ed9e1982 TH |
3893 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
3894 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
f48ed538 | 3895 | mutex_unlock(&disks_mutex); |
3830c62f | 3896 | if (error) |
5e55e2f5 N |
3897 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
3898 | disk->disk_name); | |
b62b7590 | 3899 | else { |
3830c62f | 3900 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
3901 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
3902 | } | |
d3374825 | 3903 | mddev_put(mddev); |
efeb53c0 N |
3904 | return 0; |
3905 | } | |
3906 | ||
3907 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3908 | { | |
3909 | md_alloc(dev, NULL); | |
1da177e4 LT |
3910 | return NULL; |
3911 | } | |
3912 | ||
efeb53c0 N |
3913 | static int add_named_array(const char *val, struct kernel_param *kp) |
3914 | { | |
3915 | /* val must be "md_*" where * is not all digits. | |
3916 | * We allocate an array with a large free minor number, and | |
3917 | * set the name to val. val must not already be an active name. | |
3918 | */ | |
3919 | int len = strlen(val); | |
3920 | char buf[DISK_NAME_LEN]; | |
3921 | ||
3922 | while (len && val[len-1] == '\n') | |
3923 | len--; | |
3924 | if (len >= DISK_NAME_LEN) | |
3925 | return -E2BIG; | |
3926 | strlcpy(buf, val, len+1); | |
3927 | if (strncmp(buf, "md_", 3) != 0) | |
3928 | return -EINVAL; | |
3929 | return md_alloc(0, buf); | |
3930 | } | |
3931 | ||
1da177e4 LT |
3932 | static void md_safemode_timeout(unsigned long data) |
3933 | { | |
3934 | mddev_t *mddev = (mddev_t *) data; | |
3935 | ||
0fd62b86 NB |
3936 | if (!atomic_read(&mddev->writes_pending)) { |
3937 | mddev->safemode = 1; | |
3938 | if (mddev->external) | |
b62b7590 | 3939 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 3940 | } |
1da177e4 LT |
3941 | md_wakeup_thread(mddev->thread); |
3942 | } | |
3943 | ||
6ff8d8ec | 3944 | static int start_dirty_degraded; |
1da177e4 LT |
3945 | |
3946 | static int do_md_run(mddev_t * mddev) | |
3947 | { | |
2604b703 | 3948 | int err; |
1da177e4 | 3949 | int chunk_size; |
1da177e4 LT |
3950 | mdk_rdev_t *rdev; |
3951 | struct gendisk *disk; | |
2604b703 | 3952 | struct mdk_personality *pers; |
1da177e4 LT |
3953 | char b[BDEVNAME_SIZE]; |
3954 | ||
a757e64c N |
3955 | if (list_empty(&mddev->disks)) |
3956 | /* cannot run an array with no devices.. */ | |
1da177e4 | 3957 | return -EINVAL; |
1da177e4 LT |
3958 | |
3959 | if (mddev->pers) | |
3960 | return -EBUSY; | |
3961 | ||
3962 | /* | |
3963 | * Analyze all RAID superblock(s) | |
3964 | */ | |
1ec4a939 N |
3965 | if (!mddev->raid_disks) { |
3966 | if (!mddev->persistent) | |
3967 | return -EINVAL; | |
a757e64c | 3968 | analyze_sbs(mddev); |
1ec4a939 | 3969 | } |
1da177e4 LT |
3970 | |
3971 | chunk_size = mddev->chunk_size; | |
2604b703 N |
3972 | |
3973 | if (chunk_size) { | |
1da177e4 LT |
3974 | if (chunk_size > MAX_CHUNK_SIZE) { |
3975 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
3976 | chunk_size, MAX_CHUNK_SIZE); | |
3977 | return -EINVAL; | |
3978 | } | |
3979 | /* | |
4bbf3771 | 3980 | * chunk-size has to be a power of 2 |
1da177e4 LT |
3981 | */ |
3982 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 3983 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
3984 | return -EINVAL; |
3985 | } | |
1da177e4 LT |
3986 | |
3987 | /* devices must have minimum size of one chunk */ | |
159ec1fc | 3988 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 3989 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3990 | continue; |
dd8ac336 | 3991 | if (rdev->sectors < chunk_size / 512) { |
1da177e4 LT |
3992 | printk(KERN_WARNING |
3993 | "md: Dev %s smaller than chunk_size:" | |
dd8ac336 | 3994 | " %llu < %d\n", |
1da177e4 | 3995 | bdevname(rdev->bdev,b), |
dd8ac336 AN |
3996 | (unsigned long long)rdev->sectors, |
3997 | chunk_size / 512); | |
1da177e4 LT |
3998 | return -EINVAL; |
3999 | } | |
4000 | } | |
4001 | } | |
4002 | ||
d9d166c2 N |
4003 | if (mddev->level != LEVEL_NONE) |
4004 | request_module("md-level-%d", mddev->level); | |
4005 | else if (mddev->clevel[0]) | |
4006 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4007 | |
4008 | /* | |
4009 | * Drop all container device buffers, from now on | |
4010 | * the only valid external interface is through the md | |
4011 | * device. | |
1da177e4 | 4012 | */ |
159ec1fc | 4013 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4014 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4015 | continue; |
4016 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4017 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4018 | |
4019 | /* perform some consistency tests on the device. | |
4020 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4021 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4022 | */ |
0f420358 | 4023 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4024 | if (mddev->dev_sectors && |
4025 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4026 | > rdev->sb_start) { |
f0d76d70 N |
4027 | printk("md: %s: data overlaps metadata\n", |
4028 | mdname(mddev)); | |
4029 | return -EINVAL; | |
4030 | } | |
4031 | } else { | |
0f420358 | 4032 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4033 | > rdev->data_offset) { |
4034 | printk("md: %s: metadata overlaps data\n", | |
4035 | mdname(mddev)); | |
4036 | return -EINVAL; | |
4037 | } | |
4038 | } | |
3c0ee63a | 4039 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
4040 | } |
4041 | ||
4042 | md_probe(mddev->unit, NULL, NULL); | |
4043 | disk = mddev->gendisk; | |
4044 | if (!disk) | |
4045 | return -ENOMEM; | |
4046 | ||
4047 | spin_lock(&pers_lock); | |
d9d166c2 | 4048 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4049 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4050 | spin_unlock(&pers_lock); |
d9d166c2 N |
4051 | if (mddev->level != LEVEL_NONE) |
4052 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4053 | mddev->level); | |
4054 | else | |
4055 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4056 | mddev->clevel); | |
1da177e4 LT |
4057 | return -EINVAL; |
4058 | } | |
2604b703 | 4059 | mddev->pers = pers; |
1da177e4 | 4060 | spin_unlock(&pers_lock); |
34817e8c N |
4061 | if (mddev->level != pers->level) { |
4062 | mddev->level = pers->level; | |
4063 | mddev->new_level = pers->level; | |
4064 | } | |
d9d166c2 | 4065 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4066 | |
3f9d99c1 MP |
4067 | if (pers->level >= 4 && pers->level <= 6) |
4068 | /* Cannot support integrity (yet) */ | |
4069 | blk_integrity_unregister(mddev->gendisk); | |
4070 | ||
f6705578 | 4071 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4072 | pers->start_reshape == NULL) { |
f6705578 N |
4073 | /* This personality cannot handle reshaping... */ |
4074 | mddev->pers = NULL; | |
4075 | module_put(pers->owner); | |
4076 | return -EINVAL; | |
4077 | } | |
4078 | ||
7dd5e7c3 N |
4079 | if (pers->sync_request) { |
4080 | /* Warn if this is a potentially silly | |
4081 | * configuration. | |
4082 | */ | |
4083 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4084 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4085 | int warned = 0; |
159ec1fc CR |
4086 | |
4087 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4088 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4089 | if (rdev < rdev2 && |
4090 | rdev->bdev->bd_contains == | |
4091 | rdev2->bdev->bd_contains) { | |
4092 | printk(KERN_WARNING | |
4093 | "%s: WARNING: %s appears to be" | |
4094 | " on the same physical disk as" | |
4095 | " %s.\n", | |
4096 | mdname(mddev), | |
4097 | bdevname(rdev->bdev,b), | |
4098 | bdevname(rdev2->bdev,b2)); | |
4099 | warned = 1; | |
4100 | } | |
4101 | } | |
159ec1fc | 4102 | |
7dd5e7c3 N |
4103 | if (warned) |
4104 | printk(KERN_WARNING | |
4105 | "True protection against single-disk" | |
4106 | " failure might be compromised.\n"); | |
4107 | } | |
4108 | ||
657390d2 | 4109 | mddev->recovery = 0; |
58c0fed4 AN |
4110 | /* may be over-ridden by personality */ |
4111 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4112 | ||
a9701a30 | 4113 | mddev->barriers_work = 1; |
6ff8d8ec | 4114 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4115 | |
f91de92e N |
4116 | if (start_readonly) |
4117 | mddev->ro = 2; /* read-only, but switch on first write */ | |
4118 | ||
b15c2e57 | 4119 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4120 | if (err) |
4121 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4122 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4123 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4124 | " but 'external_size' not in effect?\n", __func__); | |
4125 | printk(KERN_ERR | |
4126 | "md: invalid array_size %llu > default size %llu\n", | |
4127 | (unsigned long long)mddev->array_sectors / 2, | |
4128 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4129 | err = -EINVAL; | |
4130 | mddev->pers->stop(mddev); | |
4131 | } | |
4132 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4133 | err = bitmap_create(mddev); |
4134 | if (err) { | |
4135 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4136 | mdname(mddev), err); | |
4137 | mddev->pers->stop(mddev); | |
4138 | } | |
4139 | } | |
1da177e4 | 4140 | if (err) { |
1da177e4 LT |
4141 | module_put(mddev->pers->owner); |
4142 | mddev->pers = NULL; | |
32a7627c N |
4143 | bitmap_destroy(mddev); |
4144 | return err; | |
1da177e4 | 4145 | } |
5e55e2f5 N |
4146 | if (mddev->pers->sync_request) { |
4147 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
4148 | printk(KERN_WARNING | |
4149 | "md: cannot register extra attributes for %s\n", | |
4150 | mdname(mddev)); | |
0c3573f1 | 4151 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4152 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4153 | mddev->ro = 0; |
4154 | ||
1da177e4 LT |
4155 | atomic_set(&mddev->writes_pending,0); |
4156 | mddev->safemode = 0; | |
4157 | mddev->safemode_timer.function = md_safemode_timeout; | |
4158 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4159 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4160 | mddev->in_sync = 1; |
86e6ffdd | 4161 | |
159ec1fc | 4162 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4163 | if (rdev->raid_disk >= 0) { |
4164 | char nm[20]; | |
4165 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
4166 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
4167 | printk("md: cannot register %s for %s\n", | |
4168 | nm, mdname(mddev)); | |
86e6ffdd | 4169 | } |
1da177e4 LT |
4170 | |
4171 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4172 | ||
850b2b42 N |
4173 | if (mddev->flags) |
4174 | md_update_sb(mddev, 0); | |
1da177e4 | 4175 | |
f233ea5c | 4176 | set_capacity(disk, mddev->array_sectors); |
1da177e4 | 4177 | |
5fd6c1dc N |
4178 | /* If there is a partially-recovered drive we need to |
4179 | * start recovery here. If we leave it to md_check_recovery, | |
4180 | * it will remove the drives and not do the right thing | |
4181 | */ | |
0b8c9de0 | 4182 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 4183 | int spares = 0; |
159ec1fc | 4184 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
4185 | if (rdev->raid_disk >= 0 && |
4186 | !test_bit(In_sync, &rdev->flags) && | |
4187 | !test_bit(Faulty, &rdev->flags)) | |
4188 | /* complete an interrupted recovery */ | |
4189 | spares++; | |
4190 | if (spares && mddev->pers->sync_request) { | |
4191 | mddev->recovery = 0; | |
4192 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4193 | mddev->sync_thread = md_register_thread(md_do_sync, | |
4194 | mddev, | |
4195 | "%s_resync"); | |
4196 | if (!mddev->sync_thread) { | |
4197 | printk(KERN_ERR "%s: could not start resync" | |
4198 | " thread...\n", | |
4199 | mdname(mddev)); | |
4200 | /* leave the spares where they are, it shouldn't hurt */ | |
4201 | mddev->recovery = 0; | |
0b8c9de0 | 4202 | } |
5fd6c1dc N |
4203 | } |
4204 | } | |
0b8c9de0 N |
4205 | md_wakeup_thread(mddev->thread); |
4206 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4207 | |
44ce6294 | 4208 | mddev->changed = 1; |
d7603b7e | 4209 | md_new_event(mddev); |
b62b7590 | 4210 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
4211 | if (mddev->sysfs_action) |
4212 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 4213 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 4214 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
4215 | return 0; |
4216 | } | |
4217 | ||
4218 | static int restart_array(mddev_t *mddev) | |
4219 | { | |
4220 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4221 | |
80fab1d7 | 4222 | /* Complain if it has no devices */ |
1da177e4 | 4223 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4224 | return -ENXIO; |
4225 | if (!mddev->pers) | |
4226 | return -EINVAL; | |
4227 | if (!mddev->ro) | |
4228 | return -EBUSY; | |
4229 | mddev->safemode = 0; | |
4230 | mddev->ro = 0; | |
4231 | set_disk_ro(disk, 0); | |
4232 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4233 | mdname(mddev)); | |
4234 | /* Kick recovery or resync if necessary */ | |
4235 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4236 | md_wakeup_thread(mddev->thread); | |
4237 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 4238 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 4239 | return 0; |
1da177e4 LT |
4240 | } |
4241 | ||
acc55e22 N |
4242 | /* similar to deny_write_access, but accounts for our holding a reference |
4243 | * to the file ourselves */ | |
4244 | static int deny_bitmap_write_access(struct file * file) | |
4245 | { | |
4246 | struct inode *inode = file->f_mapping->host; | |
4247 | ||
4248 | spin_lock(&inode->i_lock); | |
4249 | if (atomic_read(&inode->i_writecount) > 1) { | |
4250 | spin_unlock(&inode->i_lock); | |
4251 | return -ETXTBSY; | |
4252 | } | |
4253 | atomic_set(&inode->i_writecount, -1); | |
4254 | spin_unlock(&inode->i_lock); | |
4255 | ||
4256 | return 0; | |
4257 | } | |
4258 | ||
4259 | static void restore_bitmap_write_access(struct file *file) | |
4260 | { | |
4261 | struct inode *inode = file->f_mapping->host; | |
4262 | ||
4263 | spin_lock(&inode->i_lock); | |
4264 | atomic_set(&inode->i_writecount, 1); | |
4265 | spin_unlock(&inode->i_lock); | |
4266 | } | |
4267 | ||
9e653b63 N |
4268 | /* mode: |
4269 | * 0 - completely stop and dis-assemble array | |
4270 | * 1 - switch to readonly | |
4271 | * 2 - stop but do not disassemble array | |
4272 | */ | |
df5b20cf | 4273 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
4274 | { |
4275 | int err = 0; | |
4276 | struct gendisk *disk = mddev->gendisk; | |
4277 | ||
f2ea68cf | 4278 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf NB |
4279 | printk("md: %s still in use.\n",mdname(mddev)); |
4280 | return -EBUSY; | |
4281 | } | |
4282 | ||
1da177e4 | 4283 | if (mddev->pers) { |
1da177e4 LT |
4284 | |
4285 | if (mddev->sync_thread) { | |
5fd6c1dc | 4286 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
4287 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4288 | md_unregister_thread(mddev->sync_thread); | |
4289 | mddev->sync_thread = NULL; | |
4290 | } | |
4291 | ||
4292 | del_timer_sync(&mddev->safemode_timer); | |
4293 | ||
9e653b63 N |
4294 | switch(mode) { |
4295 | case 1: /* readonly */ | |
1da177e4 | 4296 | err = -ENXIO; |
f91de92e | 4297 | if (mddev->ro==1) |
1da177e4 LT |
4298 | goto out; |
4299 | mddev->ro = 1; | |
9e653b63 N |
4300 | break; |
4301 | case 0: /* disassemble */ | |
4302 | case 2: /* stop */ | |
6b8b3e8a | 4303 | bitmap_flush(mddev); |
a9701a30 | 4304 | md_super_wait(mddev); |
1da177e4 LT |
4305 | if (mddev->ro) |
4306 | set_disk_ro(disk, 0); | |
409c57f3 | 4307 | |
1da177e4 | 4308 | mddev->pers->stop(mddev); |
d1b5380c N |
4309 | mddev->queue->merge_bvec_fn = NULL; |
4310 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 4311 | mddev->queue->backing_dev_info.congested_fn = NULL; |
0c3573f1 | 4312 | if (mddev->pers->sync_request) { |
411036fa | 4313 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
0c3573f1 N |
4314 | if (mddev->sysfs_action) |
4315 | sysfs_put(mddev->sysfs_action); | |
4316 | mddev->sysfs_action = NULL; | |
4317 | } | |
1da177e4 LT |
4318 | module_put(mddev->pers->owner); |
4319 | mddev->pers = NULL; | |
4f54b0e9 | 4320 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 4321 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 N |
4322 | |
4323 | set_capacity(disk, 0); | |
44ce6294 | 4324 | mddev->changed = 1; |
0d4ca600 | 4325 | |
1da177e4 LT |
4326 | if (mddev->ro) |
4327 | mddev->ro = 0; | |
4328 | } | |
850b2b42 | 4329 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
4330 | /* mark array as shutdown cleanly */ |
4331 | mddev->in_sync = 1; | |
850b2b42 | 4332 | md_update_sb(mddev, 1); |
1da177e4 | 4333 | } |
9e653b63 | 4334 | if (mode == 1) |
1da177e4 | 4335 | set_disk_ro(disk, 1); |
5fd6c1dc | 4336 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 | 4337 | } |
32a7627c | 4338 | |
1da177e4 LT |
4339 | /* |
4340 | * Free resources if final stop | |
4341 | */ | |
9e653b63 | 4342 | if (mode == 0) { |
86e6ffdd | 4343 | mdk_rdev_t *rdev; |
0d4ca600 | 4344 | |
1da177e4 LT |
4345 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4346 | ||
978f946b N |
4347 | bitmap_destroy(mddev); |
4348 | if (mddev->bitmap_file) { | |
acc55e22 | 4349 | restore_bitmap_write_access(mddev->bitmap_file); |
978f946b N |
4350 | fput(mddev->bitmap_file); |
4351 | mddev->bitmap_file = NULL; | |
4352 | } | |
4353 | mddev->bitmap_offset = 0; | |
4354 | ||
159ec1fc | 4355 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4356 | if (rdev->raid_disk >= 0) { |
4357 | char nm[20]; | |
4358 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4359 | sysfs_remove_link(&mddev->kobj, nm); | |
4360 | } | |
4361 | ||
177a99b2 | 4362 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
4363 | flush_scheduled_work(); |
4364 | ||
1da177e4 LT |
4365 | export_array(mddev); |
4366 | ||
f233ea5c | 4367 | mddev->array_sectors = 0; |
b522adcd | 4368 | mddev->external_size = 0; |
58c0fed4 | 4369 | mddev->dev_sectors = 0; |
9e653b63 | 4370 | mddev->raid_disks = 0; |
a94213b1 | 4371 | mddev->recovery_cp = 0; |
5e96ee65 | 4372 | mddev->resync_min = 0; |
c6207277 | 4373 | mddev->resync_max = MaxSector; |
08a02ecd | 4374 | mddev->reshape_position = MaxSector; |
e691063a | 4375 | mddev->external = 0; |
1ec4a939 | 4376 | mddev->persistent = 0; |
d897dbf9 N |
4377 | mddev->level = LEVEL_NONE; |
4378 | mddev->clevel[0] = 0; | |
4379 | mddev->flags = 0; | |
4380 | mddev->ro = 0; | |
4381 | mddev->metadata_type[0] = 0; | |
4382 | mddev->chunk_size = 0; | |
4383 | mddev->ctime = mddev->utime = 0; | |
4384 | mddev->layout = 0; | |
4385 | mddev->max_disks = 0; | |
4386 | mddev->events = 0; | |
4387 | mddev->delta_disks = 0; | |
4388 | mddev->new_level = LEVEL_NONE; | |
4389 | mddev->new_layout = 0; | |
4390 | mddev->new_chunk = 0; | |
4391 | mddev->curr_resync = 0; | |
4392 | mddev->resync_mismatches = 0; | |
4393 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4394 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4395 | mddev->recovery = 0; | |
4396 | mddev->in_sync = 0; | |
4397 | mddev->changed = 0; | |
4398 | mddev->degraded = 0; | |
4399 | mddev->barriers_work = 0; | |
4400 | mddev->safemode = 0; | |
934d9c23 | 4401 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4402 | if (mddev->hold_active == UNTIL_STOP) |
4403 | mddev->hold_active = 0; | |
9e653b63 | 4404 | |
a8a55c38 | 4405 | } else if (mddev->pers) |
1da177e4 LT |
4406 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4407 | mdname(mddev)); | |
4408 | err = 0; | |
3f9d99c1 | 4409 | blk_integrity_unregister(disk); |
d7603b7e | 4410 | md_new_event(mddev); |
b62b7590 | 4411 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4412 | out: |
4413 | return err; | |
4414 | } | |
4415 | ||
fdee8ae4 | 4416 | #ifndef MODULE |
1da177e4 LT |
4417 | static void autorun_array(mddev_t *mddev) |
4418 | { | |
4419 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4420 | int err; |
4421 | ||
a757e64c | 4422 | if (list_empty(&mddev->disks)) |
1da177e4 | 4423 | return; |
1da177e4 LT |
4424 | |
4425 | printk(KERN_INFO "md: running: "); | |
4426 | ||
159ec1fc | 4427 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4428 | char b[BDEVNAME_SIZE]; |
4429 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4430 | } | |
4431 | printk("\n"); | |
4432 | ||
d710e138 | 4433 | err = do_md_run(mddev); |
1da177e4 LT |
4434 | if (err) { |
4435 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4436 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4437 | } |
4438 | } | |
4439 | ||
4440 | /* | |
4441 | * lets try to run arrays based on all disks that have arrived | |
4442 | * until now. (those are in pending_raid_disks) | |
4443 | * | |
4444 | * the method: pick the first pending disk, collect all disks with | |
4445 | * the same UUID, remove all from the pending list and put them into | |
4446 | * the 'same_array' list. Then order this list based on superblock | |
4447 | * update time (freshest comes first), kick out 'old' disks and | |
4448 | * compare superblocks. If everything's fine then run it. | |
4449 | * | |
4450 | * If "unit" is allocated, then bump its reference count | |
4451 | */ | |
4452 | static void autorun_devices(int part) | |
4453 | { | |
159ec1fc | 4454 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4455 | mddev_t *mddev; |
4456 | char b[BDEVNAME_SIZE]; | |
4457 | ||
4458 | printk(KERN_INFO "md: autorun ...\n"); | |
4459 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4460 | int unit; |
1da177e4 | 4461 | dev_t dev; |
ad01c9e3 | 4462 | LIST_HEAD(candidates); |
1da177e4 LT |
4463 | rdev0 = list_entry(pending_raid_disks.next, |
4464 | mdk_rdev_t, same_set); | |
4465 | ||
4466 | printk(KERN_INFO "md: considering %s ...\n", | |
4467 | bdevname(rdev0->bdev,b)); | |
4468 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4469 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4470 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4471 | printk(KERN_INFO "md: adding %s ...\n", | |
4472 | bdevname(rdev->bdev,b)); | |
4473 | list_move(&rdev->same_set, &candidates); | |
4474 | } | |
4475 | /* | |
4476 | * now we have a set of devices, with all of them having | |
4477 | * mostly sane superblocks. It's time to allocate the | |
4478 | * mddev. | |
4479 | */ | |
e8703fe1 N |
4480 | if (part) { |
4481 | dev = MKDEV(mdp_major, | |
4482 | rdev0->preferred_minor << MdpMinorShift); | |
4483 | unit = MINOR(dev) >> MdpMinorShift; | |
4484 | } else { | |
4485 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4486 | unit = MINOR(dev); | |
4487 | } | |
4488 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4489 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4490 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4491 | break; | |
4492 | } | |
1da177e4 LT |
4493 | |
4494 | md_probe(dev, NULL, NULL); | |
4495 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4496 | if (!mddev || !mddev->gendisk) { |
4497 | if (mddev) | |
4498 | mddev_put(mddev); | |
4499 | printk(KERN_ERR | |
1da177e4 LT |
4500 | "md: cannot allocate memory for md drive.\n"); |
4501 | break; | |
4502 | } | |
4503 | if (mddev_lock(mddev)) | |
4504 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4505 | mdname(mddev)); | |
4506 | else if (mddev->raid_disks || mddev->major_version | |
4507 | || !list_empty(&mddev->disks)) { | |
4508 | printk(KERN_WARNING | |
4509 | "md: %s already running, cannot run %s\n", | |
4510 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4511 | mddev_unlock(mddev); | |
4512 | } else { | |
4513 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4514 | mddev->persistent = 1; |
159ec1fc | 4515 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4516 | list_del_init(&rdev->same_set); |
4517 | if (bind_rdev_to_array(rdev, mddev)) | |
4518 | export_rdev(rdev); | |
4519 | } | |
4520 | autorun_array(mddev); | |
4521 | mddev_unlock(mddev); | |
4522 | } | |
4523 | /* on success, candidates will be empty, on error | |
4524 | * it won't... | |
4525 | */ | |
159ec1fc | 4526 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4527 | list_del_init(&rdev->same_set); |
1da177e4 | 4528 | export_rdev(rdev); |
4b80991c | 4529 | } |
1da177e4 LT |
4530 | mddev_put(mddev); |
4531 | } | |
4532 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4533 | } | |
fdee8ae4 | 4534 | #endif /* !MODULE */ |
1da177e4 | 4535 | |
1da177e4 LT |
4536 | static int get_version(void __user * arg) |
4537 | { | |
4538 | mdu_version_t ver; | |
4539 | ||
4540 | ver.major = MD_MAJOR_VERSION; | |
4541 | ver.minor = MD_MINOR_VERSION; | |
4542 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4543 | ||
4544 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4545 | return -EFAULT; | |
4546 | ||
4547 | return 0; | |
4548 | } | |
4549 | ||
4550 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4551 | { | |
4552 | mdu_array_info_t info; | |
4553 | int nr,working,active,failed,spare; | |
4554 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4555 | |
4556 | nr=working=active=failed=spare=0; | |
159ec1fc | 4557 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4558 | nr++; |
b2d444d7 | 4559 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4560 | failed++; |
4561 | else { | |
4562 | working++; | |
b2d444d7 | 4563 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
4564 | active++; |
4565 | else | |
4566 | spare++; | |
4567 | } | |
4568 | } | |
4569 | ||
4570 | info.major_version = mddev->major_version; | |
4571 | info.minor_version = mddev->minor_version; | |
4572 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4573 | info.ctime = mddev->ctime; | |
4574 | info.level = mddev->level; | |
58c0fed4 AN |
4575 | info.size = mddev->dev_sectors / 2; |
4576 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4577 | info.size = -1; |
1da177e4 LT |
4578 | info.nr_disks = nr; |
4579 | info.raid_disks = mddev->raid_disks; | |
4580 | info.md_minor = mddev->md_minor; | |
4581 | info.not_persistent= !mddev->persistent; | |
4582 | ||
4583 | info.utime = mddev->utime; | |
4584 | info.state = 0; | |
4585 | if (mddev->in_sync) | |
4586 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
4587 | if (mddev->bitmap && mddev->bitmap_offset) |
4588 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
4589 | info.active_disks = active; |
4590 | info.working_disks = working; | |
4591 | info.failed_disks = failed; | |
4592 | info.spare_disks = spare; | |
4593 | ||
4594 | info.layout = mddev->layout; | |
4595 | info.chunk_size = mddev->chunk_size; | |
4596 | ||
4597 | if (copy_to_user(arg, &info, sizeof(info))) | |
4598 | return -EFAULT; | |
4599 | ||
4600 | return 0; | |
4601 | } | |
4602 | ||
87162a28 | 4603 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4604 | { |
4605 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4606 | char *ptr, *buf = NULL; | |
4607 | int err = -ENOMEM; | |
4608 | ||
b5470dc5 DW |
4609 | if (md_allow_write(mddev)) |
4610 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4611 | else | |
4612 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4613 | |
32a7627c N |
4614 | if (!file) |
4615 | goto out; | |
4616 | ||
4617 | /* bitmap disabled, zero the first byte and copy out */ | |
4618 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4619 | file->pathname[0] = '\0'; | |
4620 | goto copy_out; | |
4621 | } | |
4622 | ||
4623 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4624 | if (!buf) | |
4625 | goto out; | |
4626 | ||
6bcfd601 CH |
4627 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4628 | if (IS_ERR(ptr)) | |
32a7627c N |
4629 | goto out; |
4630 | ||
4631 | strcpy(file->pathname, ptr); | |
4632 | ||
4633 | copy_out: | |
4634 | err = 0; | |
4635 | if (copy_to_user(arg, file, sizeof(*file))) | |
4636 | err = -EFAULT; | |
4637 | out: | |
4638 | kfree(buf); | |
4639 | kfree(file); | |
4640 | return err; | |
4641 | } | |
4642 | ||
1da177e4 LT |
4643 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4644 | { | |
4645 | mdu_disk_info_t info; | |
1da177e4 LT |
4646 | mdk_rdev_t *rdev; |
4647 | ||
4648 | if (copy_from_user(&info, arg, sizeof(info))) | |
4649 | return -EFAULT; | |
4650 | ||
26ef379f | 4651 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4652 | if (rdev) { |
4653 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4654 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4655 | info.raid_disk = rdev->raid_disk; | |
4656 | info.state = 0; | |
b2d444d7 | 4657 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4658 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4659 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4660 | info.state |= (1<<MD_DISK_ACTIVE); |
4661 | info.state |= (1<<MD_DISK_SYNC); | |
4662 | } | |
8ddf9efe N |
4663 | if (test_bit(WriteMostly, &rdev->flags)) |
4664 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4665 | } else { |
4666 | info.major = info.minor = 0; | |
4667 | info.raid_disk = -1; | |
4668 | info.state = (1<<MD_DISK_REMOVED); | |
4669 | } | |
4670 | ||
4671 | if (copy_to_user(arg, &info, sizeof(info))) | |
4672 | return -EFAULT; | |
4673 | ||
4674 | return 0; | |
4675 | } | |
4676 | ||
4677 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4678 | { | |
4679 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4680 | mdk_rdev_t *rdev; | |
4681 | dev_t dev = MKDEV(info->major,info->minor); | |
4682 | ||
4683 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4684 | return -EOVERFLOW; | |
4685 | ||
4686 | if (!mddev->raid_disks) { | |
4687 | int err; | |
4688 | /* expecting a device which has a superblock */ | |
4689 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4690 | if (IS_ERR(rdev)) { | |
4691 | printk(KERN_WARNING | |
4692 | "md: md_import_device returned %ld\n", | |
4693 | PTR_ERR(rdev)); | |
4694 | return PTR_ERR(rdev); | |
4695 | } | |
4696 | if (!list_empty(&mddev->disks)) { | |
4697 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4698 | mdk_rdev_t, same_set); | |
4699 | int err = super_types[mddev->major_version] | |
4700 | .load_super(rdev, rdev0, mddev->minor_version); | |
4701 | if (err < 0) { | |
4702 | printk(KERN_WARNING | |
4703 | "md: %s has different UUID to %s\n", | |
4704 | bdevname(rdev->bdev,b), | |
4705 | bdevname(rdev0->bdev,b2)); | |
4706 | export_rdev(rdev); | |
4707 | return -EINVAL; | |
4708 | } | |
4709 | } | |
4710 | err = bind_rdev_to_array(rdev, mddev); | |
4711 | if (err) | |
4712 | export_rdev(rdev); | |
4713 | return err; | |
4714 | } | |
4715 | ||
4716 | /* | |
4717 | * add_new_disk can be used once the array is assembled | |
4718 | * to add "hot spares". They must already have a superblock | |
4719 | * written | |
4720 | */ | |
4721 | if (mddev->pers) { | |
4722 | int err; | |
4723 | if (!mddev->pers->hot_add_disk) { | |
4724 | printk(KERN_WARNING | |
4725 | "%s: personality does not support diskops!\n", | |
4726 | mdname(mddev)); | |
4727 | return -EINVAL; | |
4728 | } | |
7b1e35f6 N |
4729 | if (mddev->persistent) |
4730 | rdev = md_import_device(dev, mddev->major_version, | |
4731 | mddev->minor_version); | |
4732 | else | |
4733 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4734 | if (IS_ERR(rdev)) { |
4735 | printk(KERN_WARNING | |
4736 | "md: md_import_device returned %ld\n", | |
4737 | PTR_ERR(rdev)); | |
4738 | return PTR_ERR(rdev); | |
4739 | } | |
41158c7e N |
4740 | /* set save_raid_disk if appropriate */ |
4741 | if (!mddev->persistent) { | |
4742 | if (info->state & (1<<MD_DISK_SYNC) && | |
4743 | info->raid_disk < mddev->raid_disks) | |
4744 | rdev->raid_disk = info->raid_disk; | |
4745 | else | |
4746 | rdev->raid_disk = -1; | |
4747 | } else | |
4748 | super_types[mddev->major_version]. | |
4749 | validate_super(mddev, rdev); | |
4750 | rdev->saved_raid_disk = rdev->raid_disk; | |
4751 | ||
b2d444d7 | 4752 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4753 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4754 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
4755 | else |
4756 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 4757 | |
1da177e4 LT |
4758 | rdev->raid_disk = -1; |
4759 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4760 | if (!err && !mddev->pers->hot_remove_disk) { |
4761 | /* If there is hot_add_disk but no hot_remove_disk | |
4762 | * then added disks for geometry changes, | |
4763 | * and should be added immediately. | |
4764 | */ | |
4765 | super_types[mddev->major_version]. | |
4766 | validate_super(mddev, rdev); | |
4767 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4768 | if (err) | |
4769 | unbind_rdev_from_array(rdev); | |
4770 | } | |
1da177e4 LT |
4771 | if (err) |
4772 | export_rdev(rdev); | |
52664732 | 4773 | else |
3c0ee63a | 4774 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4775 | |
17571284 | 4776 | md_update_sb(mddev, 1); |
72a23c21 NB |
4777 | if (mddev->degraded) |
4778 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4779 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4780 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4781 | return err; |
4782 | } | |
4783 | ||
4784 | /* otherwise, add_new_disk is only allowed | |
4785 | * for major_version==0 superblocks | |
4786 | */ | |
4787 | if (mddev->major_version != 0) { | |
4788 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4789 | mdname(mddev)); | |
4790 | return -EINVAL; | |
4791 | } | |
4792 | ||
4793 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4794 | int err; | |
d710e138 | 4795 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4796 | if (IS_ERR(rdev)) { |
4797 | printk(KERN_WARNING | |
4798 | "md: error, md_import_device() returned %ld\n", | |
4799 | PTR_ERR(rdev)); | |
4800 | return PTR_ERR(rdev); | |
4801 | } | |
4802 | rdev->desc_nr = info->number; | |
4803 | if (info->raid_disk < mddev->raid_disks) | |
4804 | rdev->raid_disk = info->raid_disk; | |
4805 | else | |
4806 | rdev->raid_disk = -1; | |
4807 | ||
1da177e4 | 4808 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
4809 | if (info->state & (1<<MD_DISK_SYNC)) |
4810 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 4811 | |
8ddf9efe N |
4812 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4813 | set_bit(WriteMostly, &rdev->flags); | |
4814 | ||
1da177e4 LT |
4815 | if (!mddev->persistent) { |
4816 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 4817 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4818 | } else |
0f420358 | 4819 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
dd8ac336 | 4820 | rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size); |
1da177e4 | 4821 | |
2bf071bf N |
4822 | err = bind_rdev_to_array(rdev, mddev); |
4823 | if (err) { | |
4824 | export_rdev(rdev); | |
4825 | return err; | |
4826 | } | |
1da177e4 LT |
4827 | } |
4828 | ||
4829 | return 0; | |
4830 | } | |
4831 | ||
4832 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4833 | { | |
4834 | char b[BDEVNAME_SIZE]; | |
4835 | mdk_rdev_t *rdev; | |
4836 | ||
1da177e4 LT |
4837 | rdev = find_rdev(mddev, dev); |
4838 | if (!rdev) | |
4839 | return -ENXIO; | |
4840 | ||
4841 | if (rdev->raid_disk >= 0) | |
4842 | goto busy; | |
4843 | ||
4844 | kick_rdev_from_array(rdev); | |
850b2b42 | 4845 | md_update_sb(mddev, 1); |
d7603b7e | 4846 | md_new_event(mddev); |
1da177e4 LT |
4847 | |
4848 | return 0; | |
4849 | busy: | |
fdefa4d8 | 4850 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
4851 | bdevname(rdev->bdev,b), mdname(mddev)); |
4852 | return -EBUSY; | |
4853 | } | |
4854 | ||
4855 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4856 | { | |
4857 | char b[BDEVNAME_SIZE]; | |
4858 | int err; | |
1da177e4 LT |
4859 | mdk_rdev_t *rdev; |
4860 | ||
4861 | if (!mddev->pers) | |
4862 | return -ENODEV; | |
4863 | ||
4864 | if (mddev->major_version != 0) { | |
4865 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4866 | " version-0 superblocks.\n", | |
4867 | mdname(mddev)); | |
4868 | return -EINVAL; | |
4869 | } | |
4870 | if (!mddev->pers->hot_add_disk) { | |
4871 | printk(KERN_WARNING | |
4872 | "%s: personality does not support diskops!\n", | |
4873 | mdname(mddev)); | |
4874 | return -EINVAL; | |
4875 | } | |
4876 | ||
d710e138 | 4877 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
4878 | if (IS_ERR(rdev)) { |
4879 | printk(KERN_WARNING | |
4880 | "md: error, md_import_device() returned %ld\n", | |
4881 | PTR_ERR(rdev)); | |
4882 | return -EINVAL; | |
4883 | } | |
4884 | ||
4885 | if (mddev->persistent) | |
0f420358 | 4886 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 4887 | else |
0f420358 | 4888 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 4889 | |
dd8ac336 | 4890 | rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size); |
1da177e4 | 4891 | |
b2d444d7 | 4892 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4893 | printk(KERN_WARNING |
4894 | "md: can not hot-add faulty %s disk to %s!\n", | |
4895 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4896 | err = -EINVAL; | |
4897 | goto abort_export; | |
4898 | } | |
b2d444d7 | 4899 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 4900 | rdev->desc_nr = -1; |
5842730d | 4901 | rdev->saved_raid_disk = -1; |
2bf071bf N |
4902 | err = bind_rdev_to_array(rdev, mddev); |
4903 | if (err) | |
4904 | goto abort_export; | |
1da177e4 LT |
4905 | |
4906 | /* | |
4907 | * The rest should better be atomic, we can have disk failures | |
4908 | * noticed in interrupt contexts ... | |
4909 | */ | |
4910 | ||
1da177e4 LT |
4911 | rdev->raid_disk = -1; |
4912 | ||
850b2b42 | 4913 | md_update_sb(mddev, 1); |
1da177e4 LT |
4914 | |
4915 | /* | |
4916 | * Kick recovery, maybe this spare has to be added to the | |
4917 | * array immediately. | |
4918 | */ | |
4919 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4920 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4921 | md_new_event(mddev); |
1da177e4 LT |
4922 | return 0; |
4923 | ||
1da177e4 LT |
4924 | abort_export: |
4925 | export_rdev(rdev); | |
4926 | return err; | |
4927 | } | |
4928 | ||
32a7627c N |
4929 | static int set_bitmap_file(mddev_t *mddev, int fd) |
4930 | { | |
4931 | int err; | |
4932 | ||
36fa3063 N |
4933 | if (mddev->pers) { |
4934 | if (!mddev->pers->quiesce) | |
4935 | return -EBUSY; | |
4936 | if (mddev->recovery || mddev->sync_thread) | |
4937 | return -EBUSY; | |
4938 | /* we should be able to change the bitmap.. */ | |
4939 | } | |
32a7627c | 4940 | |
32a7627c | 4941 | |
36fa3063 N |
4942 | if (fd >= 0) { |
4943 | if (mddev->bitmap) | |
4944 | return -EEXIST; /* cannot add when bitmap is present */ | |
4945 | mddev->bitmap_file = fget(fd); | |
32a7627c | 4946 | |
36fa3063 N |
4947 | if (mddev->bitmap_file == NULL) { |
4948 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
4949 | mdname(mddev)); | |
4950 | return -EBADF; | |
4951 | } | |
4952 | ||
4953 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
4954 | if (err) { | |
4955 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
4956 | mdname(mddev)); | |
4957 | fput(mddev->bitmap_file); | |
4958 | mddev->bitmap_file = NULL; | |
4959 | return err; | |
4960 | } | |
a654b9d8 | 4961 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
4962 | } else if (mddev->bitmap == NULL) |
4963 | return -ENOENT; /* cannot remove what isn't there */ | |
4964 | err = 0; | |
4965 | if (mddev->pers) { | |
4966 | mddev->pers->quiesce(mddev, 1); | |
4967 | if (fd >= 0) | |
4968 | err = bitmap_create(mddev); | |
d7375ab3 | 4969 | if (fd < 0 || err) { |
36fa3063 | 4970 | bitmap_destroy(mddev); |
d7375ab3 N |
4971 | fd = -1; /* make sure to put the file */ |
4972 | } | |
36fa3063 | 4973 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
4974 | } |
4975 | if (fd < 0) { | |
acc55e22 N |
4976 | if (mddev->bitmap_file) { |
4977 | restore_bitmap_write_access(mddev->bitmap_file); | |
36fa3063 | 4978 | fput(mddev->bitmap_file); |
acc55e22 | 4979 | } |
36fa3063 N |
4980 | mddev->bitmap_file = NULL; |
4981 | } | |
4982 | ||
32a7627c N |
4983 | return err; |
4984 | } | |
4985 | ||
1da177e4 LT |
4986 | /* |
4987 | * set_array_info is used two different ways | |
4988 | * The original usage is when creating a new array. | |
4989 | * In this usage, raid_disks is > 0 and it together with | |
4990 | * level, size, not_persistent,layout,chunksize determine the | |
4991 | * shape of the array. | |
4992 | * This will always create an array with a type-0.90.0 superblock. | |
4993 | * The newer usage is when assembling an array. | |
4994 | * In this case raid_disks will be 0, and the major_version field is | |
4995 | * use to determine which style super-blocks are to be found on the devices. | |
4996 | * The minor and patch _version numbers are also kept incase the | |
4997 | * super_block handler wishes to interpret them. | |
4998 | */ | |
4999 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5000 | { | |
5001 | ||
5002 | if (info->raid_disks == 0) { | |
5003 | /* just setting version number for superblock loading */ | |
5004 | if (info->major_version < 0 || | |
50511da3 | 5005 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5006 | super_types[info->major_version].name == NULL) { |
5007 | /* maybe try to auto-load a module? */ | |
5008 | printk(KERN_INFO | |
5009 | "md: superblock version %d not known\n", | |
5010 | info->major_version); | |
5011 | return -EINVAL; | |
5012 | } | |
5013 | mddev->major_version = info->major_version; | |
5014 | mddev->minor_version = info->minor_version; | |
5015 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5016 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
5017 | return 0; |
5018 | } | |
5019 | mddev->major_version = MD_MAJOR_VERSION; | |
5020 | mddev->minor_version = MD_MINOR_VERSION; | |
5021 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5022 | mddev->ctime = get_seconds(); | |
5023 | ||
5024 | mddev->level = info->level; | |
17115e03 | 5025 | mddev->clevel[0] = 0; |
58c0fed4 | 5026 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5027 | mddev->raid_disks = info->raid_disks; |
5028 | /* don't set md_minor, it is determined by which /dev/md* was | |
5029 | * openned | |
5030 | */ | |
5031 | if (info->state & (1<<MD_SB_CLEAN)) | |
5032 | mddev->recovery_cp = MaxSector; | |
5033 | else | |
5034 | mddev->recovery_cp = 0; | |
5035 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5036 | mddev->external = 0; |
1da177e4 LT |
5037 | |
5038 | mddev->layout = info->layout; | |
5039 | mddev->chunk_size = info->chunk_size; | |
5040 | ||
5041 | mddev->max_disks = MD_SB_DISKS; | |
5042 | ||
e691063a N |
5043 | if (mddev->persistent) |
5044 | mddev->flags = 0; | |
850b2b42 | 5045 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5046 | |
b2a2703c N |
5047 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
5048 | mddev->bitmap_offset = 0; | |
5049 | ||
f6705578 N |
5050 | mddev->reshape_position = MaxSector; |
5051 | ||
1da177e4 LT |
5052 | /* |
5053 | * Generate a 128 bit UUID | |
5054 | */ | |
5055 | get_random_bytes(mddev->uuid, 16); | |
5056 | ||
f6705578 N |
5057 | mddev->new_level = mddev->level; |
5058 | mddev->new_chunk = mddev->chunk_size; | |
5059 | mddev->new_layout = mddev->layout; | |
5060 | mddev->delta_disks = 0; | |
5061 | ||
1da177e4 LT |
5062 | return 0; |
5063 | } | |
5064 | ||
1f403624 DW |
5065 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5066 | { | |
b522adcd DW |
5067 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5068 | ||
5069 | if (mddev->external_size) | |
5070 | return; | |
5071 | ||
1f403624 DW |
5072 | mddev->array_sectors = array_sectors; |
5073 | } | |
5074 | EXPORT_SYMBOL(md_set_array_sectors); | |
5075 | ||
b522adcd DW |
5076 | void md_set_array_sectors_lock(mddev_t *mddev, sector_t array_sectors) |
5077 | { | |
5078 | mddev_lock(mddev); | |
5079 | md_set_array_sectors(mddev, array_sectors); | |
5080 | mddev_unlock(mddev); | |
5081 | } | |
5082 | EXPORT_SYMBOL(md_set_array_sectors_lock); | |
5083 | ||
d71f9f88 | 5084 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5085 | { |
159ec1fc | 5086 | mdk_rdev_t *rdev; |
a35b0d69 | 5087 | int rv; |
d71f9f88 | 5088 | int fit = (num_sectors == 0); |
a35b0d69 N |
5089 | |
5090 | if (mddev->pers->resize == NULL) | |
5091 | return -EINVAL; | |
d71f9f88 AN |
5092 | /* The "num_sectors" is the number of sectors of each device that |
5093 | * is used. This can only make sense for arrays with redundancy. | |
5094 | * linear and raid0 always use whatever space is available. We can only | |
5095 | * consider changing this number if no resync or reconstruction is | |
5096 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5097 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5098 | * of each device. If num_sectors is zero, we find the largest size |
5099 | * that fits. | |
5100 | ||
a35b0d69 N |
5101 | */ |
5102 | if (mddev->sync_thread) | |
5103 | return -EBUSY; | |
dba034ee N |
5104 | if (mddev->bitmap) |
5105 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5106 | * grow, and re-add. | |
5107 | */ | |
5108 | return -EBUSY; | |
159ec1fc | 5109 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5110 | sector_t avail = rdev->sectors; |
01ab5662 | 5111 | |
d71f9f88 AN |
5112 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5113 | num_sectors = avail; | |
5114 | if (avail < num_sectors) | |
a35b0d69 N |
5115 | return -ENOSPC; |
5116 | } | |
d71f9f88 | 5117 | rv = mddev->pers->resize(mddev, num_sectors); |
a35b0d69 N |
5118 | if (!rv) { |
5119 | struct block_device *bdev; | |
5120 | ||
5121 | bdev = bdget_disk(mddev->gendisk, 0); | |
5122 | if (bdev) { | |
1b1dcc1b | 5123 | mutex_lock(&bdev->bd_inode->i_mutex); |
f233ea5c AN |
5124 | i_size_write(bdev->bd_inode, |
5125 | (loff_t)mddev->array_sectors << 9); | |
1b1dcc1b | 5126 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
5127 | bdput(bdev); |
5128 | } | |
5129 | } | |
5130 | return rv; | |
5131 | } | |
5132 | ||
da943b99 N |
5133 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5134 | { | |
5135 | int rv; | |
5136 | /* change the number of raid disks */ | |
63c70c4f | 5137 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5138 | return -EINVAL; |
5139 | if (raid_disks <= 0 || | |
5140 | raid_disks >= mddev->max_disks) | |
5141 | return -EINVAL; | |
63c70c4f | 5142 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5143 | return -EBUSY; |
63c70c4f N |
5144 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5145 | ||
5146 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5147 | return rv; |
5148 | } | |
5149 | ||
5150 | ||
1da177e4 LT |
5151 | /* |
5152 | * update_array_info is used to change the configuration of an | |
5153 | * on-line array. | |
5154 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5155 | * fields in the info are checked against the array. | |
5156 | * Any differences that cannot be handled will cause an error. | |
5157 | * Normally, only one change can be managed at a time. | |
5158 | */ | |
5159 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5160 | { | |
5161 | int rv = 0; | |
5162 | int cnt = 0; | |
36fa3063 N |
5163 | int state = 0; |
5164 | ||
5165 | /* calculate expected state,ignoring low bits */ | |
5166 | if (mddev->bitmap && mddev->bitmap_offset) | |
5167 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
5168 | |
5169 | if (mddev->major_version != info->major_version || | |
5170 | mddev->minor_version != info->minor_version || | |
5171 | /* mddev->patch_version != info->patch_version || */ | |
5172 | mddev->ctime != info->ctime || | |
5173 | mddev->level != info->level || | |
5174 | /* mddev->layout != info->layout || */ | |
5175 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
5176 | mddev->chunk_size != info->chunk_size || |
5177 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
5178 | ((state^info->state) & 0xfffffe00) | |
5179 | ) | |
1da177e4 LT |
5180 | return -EINVAL; |
5181 | /* Check there is only one change */ | |
58c0fed4 AN |
5182 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5183 | cnt++; | |
5184 | if (mddev->raid_disks != info->raid_disks) | |
5185 | cnt++; | |
5186 | if (mddev->layout != info->layout) | |
5187 | cnt++; | |
5188 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5189 | cnt++; | |
5190 | if (cnt == 0) | |
5191 | return 0; | |
5192 | if (cnt > 1) | |
5193 | return -EINVAL; | |
1da177e4 LT |
5194 | |
5195 | if (mddev->layout != info->layout) { | |
5196 | /* Change layout | |
5197 | * we don't need to do anything at the md level, the | |
5198 | * personality will take care of it all. | |
5199 | */ | |
5200 | if (mddev->pers->reconfig == NULL) | |
5201 | return -EINVAL; | |
5202 | else | |
5203 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
5204 | } | |
58c0fed4 | 5205 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5206 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5207 | |
da943b99 N |
5208 | if (mddev->raid_disks != info->raid_disks) |
5209 | rv = update_raid_disks(mddev, info->raid_disks); | |
5210 | ||
36fa3063 N |
5211 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5212 | if (mddev->pers->quiesce == NULL) | |
5213 | return -EINVAL; | |
5214 | if (mddev->recovery || mddev->sync_thread) | |
5215 | return -EBUSY; | |
5216 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5217 | /* add the bitmap */ | |
5218 | if (mddev->bitmap) | |
5219 | return -EEXIST; | |
5220 | if (mddev->default_bitmap_offset == 0) | |
5221 | return -EINVAL; | |
5222 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
5223 | mddev->pers->quiesce(mddev, 1); | |
5224 | rv = bitmap_create(mddev); | |
5225 | if (rv) | |
5226 | bitmap_destroy(mddev); | |
5227 | mddev->pers->quiesce(mddev, 0); | |
5228 | } else { | |
5229 | /* remove the bitmap */ | |
5230 | if (!mddev->bitmap) | |
5231 | return -ENOENT; | |
5232 | if (mddev->bitmap->file) | |
5233 | return -EINVAL; | |
5234 | mddev->pers->quiesce(mddev, 1); | |
5235 | bitmap_destroy(mddev); | |
5236 | mddev->pers->quiesce(mddev, 0); | |
5237 | mddev->bitmap_offset = 0; | |
5238 | } | |
5239 | } | |
850b2b42 | 5240 | md_update_sb(mddev, 1); |
1da177e4 LT |
5241 | return rv; |
5242 | } | |
5243 | ||
5244 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5245 | { | |
5246 | mdk_rdev_t *rdev; | |
5247 | ||
5248 | if (mddev->pers == NULL) | |
5249 | return -ENODEV; | |
5250 | ||
5251 | rdev = find_rdev(mddev, dev); | |
5252 | if (!rdev) | |
5253 | return -ENODEV; | |
5254 | ||
5255 | md_error(mddev, rdev); | |
5256 | return 0; | |
5257 | } | |
5258 | ||
2f9618ce AN |
5259 | /* |
5260 | * We have a problem here : there is no easy way to give a CHS | |
5261 | * virtual geometry. We currently pretend that we have a 2 heads | |
5262 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5263 | * dosfs just mad... ;-) | |
5264 | */ | |
a885c8c4 CH |
5265 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5266 | { | |
5267 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5268 | ||
5269 | geo->heads = 2; | |
5270 | geo->sectors = 4; | |
5271 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
5272 | return 0; | |
5273 | } | |
5274 | ||
a39907fa | 5275 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5276 | unsigned int cmd, unsigned long arg) |
5277 | { | |
5278 | int err = 0; | |
5279 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
5280 | mddev_t *mddev = NULL; |
5281 | ||
5282 | if (!capable(CAP_SYS_ADMIN)) | |
5283 | return -EACCES; | |
5284 | ||
5285 | /* | |
5286 | * Commands dealing with the RAID driver but not any | |
5287 | * particular array: | |
5288 | */ | |
5289 | switch (cmd) | |
5290 | { | |
5291 | case RAID_VERSION: | |
5292 | err = get_version(argp); | |
5293 | goto done; | |
5294 | ||
5295 | case PRINT_RAID_DEBUG: | |
5296 | err = 0; | |
5297 | md_print_devices(); | |
5298 | goto done; | |
5299 | ||
5300 | #ifndef MODULE | |
5301 | case RAID_AUTORUN: | |
5302 | err = 0; | |
5303 | autostart_arrays(arg); | |
5304 | goto done; | |
5305 | #endif | |
5306 | default:; | |
5307 | } | |
5308 | ||
5309 | /* | |
5310 | * Commands creating/starting a new array: | |
5311 | */ | |
5312 | ||
a39907fa | 5313 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5314 | |
5315 | if (!mddev) { | |
5316 | BUG(); | |
5317 | goto abort; | |
5318 | } | |
5319 | ||
1da177e4 LT |
5320 | err = mddev_lock(mddev); |
5321 | if (err) { | |
5322 | printk(KERN_INFO | |
5323 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5324 | err, cmd); | |
5325 | goto abort; | |
5326 | } | |
5327 | ||
5328 | switch (cmd) | |
5329 | { | |
5330 | case SET_ARRAY_INFO: | |
5331 | { | |
5332 | mdu_array_info_t info; | |
5333 | if (!arg) | |
5334 | memset(&info, 0, sizeof(info)); | |
5335 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5336 | err = -EFAULT; | |
5337 | goto abort_unlock; | |
5338 | } | |
5339 | if (mddev->pers) { | |
5340 | err = update_array_info(mddev, &info); | |
5341 | if (err) { | |
5342 | printk(KERN_WARNING "md: couldn't update" | |
5343 | " array info. %d\n", err); | |
5344 | goto abort_unlock; | |
5345 | } | |
5346 | goto done_unlock; | |
5347 | } | |
5348 | if (!list_empty(&mddev->disks)) { | |
5349 | printk(KERN_WARNING | |
5350 | "md: array %s already has disks!\n", | |
5351 | mdname(mddev)); | |
5352 | err = -EBUSY; | |
5353 | goto abort_unlock; | |
5354 | } | |
5355 | if (mddev->raid_disks) { | |
5356 | printk(KERN_WARNING | |
5357 | "md: array %s already initialised!\n", | |
5358 | mdname(mddev)); | |
5359 | err = -EBUSY; | |
5360 | goto abort_unlock; | |
5361 | } | |
5362 | err = set_array_info(mddev, &info); | |
5363 | if (err) { | |
5364 | printk(KERN_WARNING "md: couldn't set" | |
5365 | " array info. %d\n", err); | |
5366 | goto abort_unlock; | |
5367 | } | |
5368 | } | |
5369 | goto done_unlock; | |
5370 | ||
5371 | default:; | |
5372 | } | |
5373 | ||
5374 | /* | |
5375 | * Commands querying/configuring an existing array: | |
5376 | */ | |
32a7627c | 5377 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5378 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5379 | if ((!mddev->raid_disks && !mddev->external) |
5380 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5381 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5382 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5383 | err = -ENODEV; |
5384 | goto abort_unlock; | |
5385 | } | |
5386 | ||
5387 | /* | |
5388 | * Commands even a read-only array can execute: | |
5389 | */ | |
5390 | switch (cmd) | |
5391 | { | |
5392 | case GET_ARRAY_INFO: | |
5393 | err = get_array_info(mddev, argp); | |
5394 | goto done_unlock; | |
5395 | ||
32a7627c | 5396 | case GET_BITMAP_FILE: |
87162a28 | 5397 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5398 | goto done_unlock; |
5399 | ||
1da177e4 LT |
5400 | case GET_DISK_INFO: |
5401 | err = get_disk_info(mddev, argp); | |
5402 | goto done_unlock; | |
5403 | ||
5404 | case RESTART_ARRAY_RW: | |
5405 | err = restart_array(mddev); | |
5406 | goto done_unlock; | |
5407 | ||
5408 | case STOP_ARRAY: | |
d710e138 | 5409 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5410 | goto done_unlock; |
5411 | ||
5412 | case STOP_ARRAY_RO: | |
d710e138 | 5413 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
5414 | goto done_unlock; |
5415 | ||
1da177e4 LT |
5416 | } |
5417 | ||
5418 | /* | |
5419 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5420 | * superblock, so we do not allow them on read-only arrays. |
5421 | * However non-MD ioctls (e.g. get-size) will still come through | |
5422 | * here and hit the 'default' below, so only disallow | |
5423 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5424 | */ |
bb57fc64 | 5425 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5426 | if (mddev->ro == 2) { |
5427 | mddev->ro = 0; | |
b62b7590 | 5428 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5429 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5430 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5431 | } else { |
5432 | err = -EROFS; | |
5433 | goto abort_unlock; | |
5434 | } | |
1da177e4 LT |
5435 | } |
5436 | ||
5437 | switch (cmd) | |
5438 | { | |
5439 | case ADD_NEW_DISK: | |
5440 | { | |
5441 | mdu_disk_info_t info; | |
5442 | if (copy_from_user(&info, argp, sizeof(info))) | |
5443 | err = -EFAULT; | |
5444 | else | |
5445 | err = add_new_disk(mddev, &info); | |
5446 | goto done_unlock; | |
5447 | } | |
5448 | ||
5449 | case HOT_REMOVE_DISK: | |
5450 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5451 | goto done_unlock; | |
5452 | ||
5453 | case HOT_ADD_DISK: | |
5454 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5455 | goto done_unlock; | |
5456 | ||
5457 | case SET_DISK_FAULTY: | |
5458 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5459 | goto done_unlock; | |
5460 | ||
5461 | case RUN_ARRAY: | |
d710e138 | 5462 | err = do_md_run(mddev); |
1da177e4 LT |
5463 | goto done_unlock; |
5464 | ||
32a7627c N |
5465 | case SET_BITMAP_FILE: |
5466 | err = set_bitmap_file(mddev, (int)arg); | |
5467 | goto done_unlock; | |
5468 | ||
1da177e4 | 5469 | default: |
1da177e4 LT |
5470 | err = -EINVAL; |
5471 | goto abort_unlock; | |
5472 | } | |
5473 | ||
5474 | done_unlock: | |
5475 | abort_unlock: | |
d3374825 N |
5476 | if (mddev->hold_active == UNTIL_IOCTL && |
5477 | err != -EINVAL) | |
5478 | mddev->hold_active = 0; | |
1da177e4 LT |
5479 | mddev_unlock(mddev); |
5480 | ||
5481 | return err; | |
5482 | done: | |
5483 | if (err) | |
5484 | MD_BUG(); | |
5485 | abort: | |
5486 | return err; | |
5487 | } | |
5488 | ||
a39907fa | 5489 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5490 | { |
5491 | /* | |
5492 | * Succeed if we can lock the mddev, which confirms that | |
5493 | * it isn't being stopped right now. | |
5494 | */ | |
d3374825 | 5495 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5496 | int err; |
5497 | ||
d3374825 N |
5498 | if (mddev->gendisk != bdev->bd_disk) { |
5499 | /* we are racing with mddev_put which is discarding this | |
5500 | * bd_disk. | |
5501 | */ | |
5502 | mddev_put(mddev); | |
5503 | /* Wait until bdev->bd_disk is definitely gone */ | |
5504 | flush_scheduled_work(); | |
5505 | /* Then retry the open from the top */ | |
5506 | return -ERESTARTSYS; | |
5507 | } | |
5508 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5509 | ||
d63a5a74 | 5510 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
1da177e4 LT |
5511 | goto out; |
5512 | ||
5513 | err = 0; | |
f2ea68cf | 5514 | atomic_inc(&mddev->openers); |
1da177e4 LT |
5515 | mddev_unlock(mddev); |
5516 | ||
a39907fa | 5517 | check_disk_change(bdev); |
1da177e4 LT |
5518 | out: |
5519 | return err; | |
5520 | } | |
5521 | ||
a39907fa | 5522 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5523 | { |
a39907fa | 5524 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5525 | |
52e5f9d1 | 5526 | BUG_ON(!mddev); |
f2ea68cf | 5527 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5528 | mddev_put(mddev); |
5529 | ||
5530 | return 0; | |
5531 | } | |
5532 | ||
44ce6294 LT |
5533 | static int md_media_changed(struct gendisk *disk) |
5534 | { | |
5535 | mddev_t *mddev = disk->private_data; | |
5536 | ||
5537 | return mddev->changed; | |
5538 | } | |
5539 | ||
5540 | static int md_revalidate(struct gendisk *disk) | |
5541 | { | |
5542 | mddev_t *mddev = disk->private_data; | |
5543 | ||
5544 | mddev->changed = 0; | |
5545 | return 0; | |
5546 | } | |
1da177e4 LT |
5547 | static struct block_device_operations md_fops = |
5548 | { | |
5549 | .owner = THIS_MODULE, | |
a39907fa AV |
5550 | .open = md_open, |
5551 | .release = md_release, | |
5552 | .locked_ioctl = md_ioctl, | |
a885c8c4 | 5553 | .getgeo = md_getgeo, |
44ce6294 LT |
5554 | .media_changed = md_media_changed, |
5555 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5556 | }; |
5557 | ||
75c96f85 | 5558 | static int md_thread(void * arg) |
1da177e4 LT |
5559 | { |
5560 | mdk_thread_t *thread = arg; | |
5561 | ||
1da177e4 LT |
5562 | /* |
5563 | * md_thread is a 'system-thread', it's priority should be very | |
5564 | * high. We avoid resource deadlocks individually in each | |
5565 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5566 | * the very same RT priority as kswapd, thus we will never get | |
5567 | * into a priority inversion deadlock. | |
5568 | * | |
5569 | * we definitely have to have equal or higher priority than | |
5570 | * bdflush, otherwise bdflush will deadlock if there are too | |
5571 | * many dirty RAID5 blocks. | |
5572 | */ | |
1da177e4 | 5573 | |
6985c43f | 5574 | allow_signal(SIGKILL); |
a6fb0934 | 5575 | while (!kthread_should_stop()) { |
1da177e4 | 5576 | |
93588e22 N |
5577 | /* We need to wait INTERRUPTIBLE so that |
5578 | * we don't add to the load-average. | |
5579 | * That means we need to be sure no signals are | |
5580 | * pending | |
5581 | */ | |
5582 | if (signal_pending(current)) | |
5583 | flush_signals(current); | |
5584 | ||
5585 | wait_event_interruptible_timeout | |
5586 | (thread->wqueue, | |
5587 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5588 | || kthread_should_stop(), | |
5589 | thread->timeout); | |
1da177e4 LT |
5590 | |
5591 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5592 | ||
787453c2 | 5593 | thread->run(thread->mddev); |
1da177e4 | 5594 | } |
a6fb0934 | 5595 | |
1da177e4 LT |
5596 | return 0; |
5597 | } | |
5598 | ||
5599 | void md_wakeup_thread(mdk_thread_t *thread) | |
5600 | { | |
5601 | if (thread) { | |
5602 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5603 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5604 | wake_up(&thread->wqueue); | |
5605 | } | |
5606 | } | |
5607 | ||
5608 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5609 | const char *name) | |
5610 | { | |
5611 | mdk_thread_t *thread; | |
1da177e4 | 5612 | |
9ffae0cf | 5613 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5614 | if (!thread) |
5615 | return NULL; | |
5616 | ||
1da177e4 LT |
5617 | init_waitqueue_head(&thread->wqueue); |
5618 | ||
1da177e4 LT |
5619 | thread->run = run; |
5620 | thread->mddev = mddev; | |
32a7627c | 5621 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 5622 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 5623 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5624 | kfree(thread); |
5625 | return NULL; | |
5626 | } | |
1da177e4 LT |
5627 | return thread; |
5628 | } | |
5629 | ||
1da177e4 LT |
5630 | void md_unregister_thread(mdk_thread_t *thread) |
5631 | { | |
e0cf8f04 N |
5632 | if (!thread) |
5633 | return; | |
ba25f9dc | 5634 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5635 | |
5636 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5637 | kfree(thread); |
5638 | } | |
5639 | ||
5640 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5641 | { | |
5642 | if (!mddev) { | |
5643 | MD_BUG(); | |
5644 | return; | |
5645 | } | |
5646 | ||
b2d444d7 | 5647 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5648 | return; |
6bfe0b49 DW |
5649 | |
5650 | if (mddev->external) | |
5651 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5652 | /* |
1da177e4 LT |
5653 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5654 | mdname(mddev), | |
5655 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5656 | __builtin_return_address(0),__builtin_return_address(1), | |
5657 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5658 | */ |
d0a0a5ee AM |
5659 | if (!mddev->pers) |
5660 | return; | |
1da177e4 LT |
5661 | if (!mddev->pers->error_handler) |
5662 | return; | |
5663 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5664 | if (mddev->degraded) |
5665 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5666 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5667 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5668 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5669 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5670 | md_new_event_inintr(mddev); |
1da177e4 LT |
5671 | } |
5672 | ||
5673 | /* seq_file implementation /proc/mdstat */ | |
5674 | ||
5675 | static void status_unused(struct seq_file *seq) | |
5676 | { | |
5677 | int i = 0; | |
5678 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5679 | |
5680 | seq_printf(seq, "unused devices: "); | |
5681 | ||
159ec1fc | 5682 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5683 | char b[BDEVNAME_SIZE]; |
5684 | i++; | |
5685 | seq_printf(seq, "%s ", | |
5686 | bdevname(rdev->bdev,b)); | |
5687 | } | |
5688 | if (!i) | |
5689 | seq_printf(seq, "<none>"); | |
5690 | ||
5691 | seq_printf(seq, "\n"); | |
5692 | } | |
5693 | ||
5694 | ||
5695 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5696 | { | |
4588b42e N |
5697 | sector_t max_blocks, resync, res; |
5698 | unsigned long dt, db, rt; | |
5699 | int scale; | |
5700 | unsigned int per_milli; | |
1da177e4 LT |
5701 | |
5702 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
5703 | ||
5704 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5705 | max_blocks = mddev->resync_max_sectors >> 1; | |
5706 | else | |
58c0fed4 | 5707 | max_blocks = mddev->dev_sectors / 2; |
1da177e4 LT |
5708 | |
5709 | /* | |
5710 | * Should not happen. | |
5711 | */ | |
5712 | if (!max_blocks) { | |
5713 | MD_BUG(); | |
5714 | return; | |
5715 | } | |
4588b42e N |
5716 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
5717 | * in a sector_t, and (max_blocks>>scale) will fit in a | |
5718 | * u32, as those are the requirements for sector_div. | |
5719 | * Thus 'scale' must be at least 10 | |
5720 | */ | |
5721 | scale = 10; | |
5722 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5723 | while ( max_blocks/2 > (1ULL<<(scale+32))) | |
5724 | scale++; | |
5725 | } | |
5726 | res = (resync>>scale)*1000; | |
5727 | sector_div(res, (u32)((max_blocks>>scale)+1)); | |
5728 | ||
5729 | per_milli = res; | |
1da177e4 | 5730 | { |
4588b42e | 5731 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5732 | seq_printf(seq, "["); |
5733 | for (i = 0; i < x; i++) | |
5734 | seq_printf(seq, "="); | |
5735 | seq_printf(seq, ">"); | |
5736 | for (i = 0; i < y; i++) | |
5737 | seq_printf(seq, "."); | |
5738 | seq_printf(seq, "] "); | |
5739 | } | |
4588b42e | 5740 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5741 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5742 | "reshape" : | |
61df9d91 N |
5743 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5744 | "check" : | |
5745 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5746 | "resync" : "recovery"))), | |
5747 | per_milli/10, per_milli % 10, | |
4588b42e N |
5748 | (unsigned long long) resync, |
5749 | (unsigned long long) max_blocks); | |
1da177e4 LT |
5750 | |
5751 | /* | |
5752 | * We do not want to overflow, so the order of operands and | |
5753 | * the * 100 / 100 trick are important. We do a +1 to be | |
5754 | * safe against division by zero. We only estimate anyway. | |
5755 | * | |
5756 | * dt: time from mark until now | |
5757 | * db: blocks written from mark until now | |
5758 | * rt: remaining time | |
5759 | */ | |
5760 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5761 | if (!dt) dt++; | |
ff4e8d9a N |
5762 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5763 | - mddev->resync_mark_cnt; | |
5764 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; | |
1da177e4 LT |
5765 | |
5766 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
5767 | ||
ff4e8d9a | 5768 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5769 | } |
5770 | ||
5771 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5772 | { | |
5773 | struct list_head *tmp; | |
5774 | loff_t l = *pos; | |
5775 | mddev_t *mddev; | |
5776 | ||
5777 | if (l >= 0x10000) | |
5778 | return NULL; | |
5779 | if (!l--) | |
5780 | /* header */ | |
5781 | return (void*)1; | |
5782 | ||
5783 | spin_lock(&all_mddevs_lock); | |
5784 | list_for_each(tmp,&all_mddevs) | |
5785 | if (!l--) { | |
5786 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5787 | mddev_get(mddev); | |
5788 | spin_unlock(&all_mddevs_lock); | |
5789 | return mddev; | |
5790 | } | |
5791 | spin_unlock(&all_mddevs_lock); | |
5792 | if (!l--) | |
5793 | return (void*)2;/* tail */ | |
5794 | return NULL; | |
5795 | } | |
5796 | ||
5797 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5798 | { | |
5799 | struct list_head *tmp; | |
5800 | mddev_t *next_mddev, *mddev = v; | |
5801 | ||
5802 | ++*pos; | |
5803 | if (v == (void*)2) | |
5804 | return NULL; | |
5805 | ||
5806 | spin_lock(&all_mddevs_lock); | |
5807 | if (v == (void*)1) | |
5808 | tmp = all_mddevs.next; | |
5809 | else | |
5810 | tmp = mddev->all_mddevs.next; | |
5811 | if (tmp != &all_mddevs) | |
5812 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5813 | else { | |
5814 | next_mddev = (void*)2; | |
5815 | *pos = 0x10000; | |
5816 | } | |
5817 | spin_unlock(&all_mddevs_lock); | |
5818 | ||
5819 | if (v != (void*)1) | |
5820 | mddev_put(mddev); | |
5821 | return next_mddev; | |
5822 | ||
5823 | } | |
5824 | ||
5825 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5826 | { | |
5827 | mddev_t *mddev = v; | |
5828 | ||
5829 | if (mddev && v != (void*)1 && v != (void*)2) | |
5830 | mddev_put(mddev); | |
5831 | } | |
5832 | ||
d7603b7e N |
5833 | struct mdstat_info { |
5834 | int event; | |
5835 | }; | |
5836 | ||
1da177e4 LT |
5837 | static int md_seq_show(struct seq_file *seq, void *v) |
5838 | { | |
5839 | mddev_t *mddev = v; | |
dd8ac336 | 5840 | sector_t sectors; |
1da177e4 | 5841 | mdk_rdev_t *rdev; |
d7603b7e | 5842 | struct mdstat_info *mi = seq->private; |
32a7627c | 5843 | struct bitmap *bitmap; |
1da177e4 LT |
5844 | |
5845 | if (v == (void*)1) { | |
2604b703 | 5846 | struct mdk_personality *pers; |
1da177e4 LT |
5847 | seq_printf(seq, "Personalities : "); |
5848 | spin_lock(&pers_lock); | |
2604b703 N |
5849 | list_for_each_entry(pers, &pers_list, list) |
5850 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
5851 | |
5852 | spin_unlock(&pers_lock); | |
5853 | seq_printf(seq, "\n"); | |
d7603b7e | 5854 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
5855 | return 0; |
5856 | } | |
5857 | if (v == (void*)2) { | |
5858 | status_unused(seq); | |
5859 | return 0; | |
5860 | } | |
5861 | ||
5dc5cf7d | 5862 | if (mddev_lock(mddev) < 0) |
1da177e4 | 5863 | return -EINTR; |
5dc5cf7d | 5864 | |
1da177e4 LT |
5865 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
5866 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5867 | mddev->pers ? "" : "in"); | |
5868 | if (mddev->pers) { | |
f91de92e | 5869 | if (mddev->ro==1) |
1da177e4 | 5870 | seq_printf(seq, " (read-only)"); |
f91de92e | 5871 | if (mddev->ro==2) |
52720ae7 | 5872 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
5873 | seq_printf(seq, " %s", mddev->pers->name); |
5874 | } | |
5875 | ||
dd8ac336 | 5876 | sectors = 0; |
159ec1fc | 5877 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5878 | char b[BDEVNAME_SIZE]; |
5879 | seq_printf(seq, " %s[%d]", | |
5880 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
5881 | if (test_bit(WriteMostly, &rdev->flags)) |
5882 | seq_printf(seq, "(W)"); | |
b2d444d7 | 5883 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5884 | seq_printf(seq, "(F)"); |
5885 | continue; | |
b325a32e N |
5886 | } else if (rdev->raid_disk < 0) |
5887 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 5888 | sectors += rdev->sectors; |
1da177e4 LT |
5889 | } |
5890 | ||
5891 | if (!list_empty(&mddev->disks)) { | |
5892 | if (mddev->pers) | |
5893 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
5894 | (unsigned long long) |
5895 | mddev->array_sectors / 2); | |
1da177e4 LT |
5896 | else |
5897 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 5898 | (unsigned long long)sectors / 2); |
1da177e4 | 5899 | } |
1cd6bf19 N |
5900 | if (mddev->persistent) { |
5901 | if (mddev->major_version != 0 || | |
5902 | mddev->minor_version != 90) { | |
5903 | seq_printf(seq," super %d.%d", | |
5904 | mddev->major_version, | |
5905 | mddev->minor_version); | |
5906 | } | |
e691063a N |
5907 | } else if (mddev->external) |
5908 | seq_printf(seq, " super external:%s", | |
5909 | mddev->metadata_type); | |
5910 | else | |
1cd6bf19 | 5911 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
5912 | |
5913 | if (mddev->pers) { | |
d710e138 | 5914 | mddev->pers->status(seq, mddev); |
1da177e4 | 5915 | seq_printf(seq, "\n "); |
8e1b39d6 N |
5916 | if (mddev->pers->sync_request) { |
5917 | if (mddev->curr_resync > 2) { | |
d710e138 | 5918 | status_resync(seq, mddev); |
8e1b39d6 N |
5919 | seq_printf(seq, "\n "); |
5920 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5921 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5922 | else if (mddev->recovery_cp < MaxSector) | |
5923 | seq_printf(seq, "\tresync=PENDING\n "); | |
5924 | } | |
32a7627c N |
5925 | } else |
5926 | seq_printf(seq, "\n "); | |
5927 | ||
5928 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
5929 | unsigned long chunk_kb; |
5930 | unsigned long flags; | |
32a7627c N |
5931 | spin_lock_irqsave(&bitmap->lock, flags); |
5932 | chunk_kb = bitmap->chunksize >> 10; | |
5933 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5934 | "%lu%s chunk", | |
5935 | bitmap->pages - bitmap->missing_pages, | |
5936 | bitmap->pages, | |
5937 | (bitmap->pages - bitmap->missing_pages) | |
5938 | << (PAGE_SHIFT - 10), | |
5939 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5940 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
5941 | if (bitmap->file) { |
5942 | seq_printf(seq, ", file: "); | |
c32c2f63 | 5943 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 5944 | } |
78d742d8 | 5945 | |
32a7627c N |
5946 | seq_printf(seq, "\n"); |
5947 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
5948 | } |
5949 | ||
5950 | seq_printf(seq, "\n"); | |
5951 | } | |
5952 | mddev_unlock(mddev); | |
5953 | ||
5954 | return 0; | |
5955 | } | |
5956 | ||
5957 | static struct seq_operations md_seq_ops = { | |
5958 | .start = md_seq_start, | |
5959 | .next = md_seq_next, | |
5960 | .stop = md_seq_stop, | |
5961 | .show = md_seq_show, | |
5962 | }; | |
5963 | ||
5964 | static int md_seq_open(struct inode *inode, struct file *file) | |
5965 | { | |
5966 | int error; | |
d7603b7e N |
5967 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
5968 | if (mi == NULL) | |
5969 | return -ENOMEM; | |
1da177e4 LT |
5970 | |
5971 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
5972 | if (error) |
5973 | kfree(mi); | |
5974 | else { | |
5975 | struct seq_file *p = file->private_data; | |
5976 | p->private = mi; | |
5977 | mi->event = atomic_read(&md_event_count); | |
5978 | } | |
1da177e4 LT |
5979 | return error; |
5980 | } | |
5981 | ||
d7603b7e N |
5982 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
5983 | { | |
5984 | struct seq_file *m = filp->private_data; | |
5985 | struct mdstat_info *mi = m->private; | |
5986 | int mask; | |
5987 | ||
5988 | poll_wait(filp, &md_event_waiters, wait); | |
5989 | ||
5990 | /* always allow read */ | |
5991 | mask = POLLIN | POLLRDNORM; | |
5992 | ||
5993 | if (mi->event != atomic_read(&md_event_count)) | |
5994 | mask |= POLLERR | POLLPRI; | |
5995 | return mask; | |
5996 | } | |
5997 | ||
fa027c2a | 5998 | static const struct file_operations md_seq_fops = { |
e24650c2 | 5999 | .owner = THIS_MODULE, |
1da177e4 LT |
6000 | .open = md_seq_open, |
6001 | .read = seq_read, | |
6002 | .llseek = seq_lseek, | |
c3f94b40 | 6003 | .release = seq_release_private, |
d7603b7e | 6004 | .poll = mdstat_poll, |
1da177e4 LT |
6005 | }; |
6006 | ||
2604b703 | 6007 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6008 | { |
1da177e4 | 6009 | spin_lock(&pers_lock); |
2604b703 N |
6010 | list_add_tail(&p->list, &pers_list); |
6011 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6012 | spin_unlock(&pers_lock); |
6013 | return 0; | |
6014 | } | |
6015 | ||
2604b703 | 6016 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6017 | { |
2604b703 | 6018 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6019 | spin_lock(&pers_lock); |
2604b703 | 6020 | list_del_init(&p->list); |
1da177e4 LT |
6021 | spin_unlock(&pers_lock); |
6022 | return 0; | |
6023 | } | |
6024 | ||
eea1bf38 | 6025 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6026 | { |
6027 | mdk_rdev_t * rdev; | |
1da177e4 | 6028 | int idle; |
eea1bf38 | 6029 | int curr_events; |
1da177e4 LT |
6030 | |
6031 | idle = 1; | |
4b80991c N |
6032 | rcu_read_lock(); |
6033 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6034 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6035 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6036 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6037 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6038 | /* sync IO will cause sync_io to increase before the disk_stats |
6039 | * as sync_io is counted when a request starts, and | |
6040 | * disk_stats is counted when it completes. | |
6041 | * So resync activity will cause curr_events to be smaller than | |
6042 | * when there was no such activity. | |
6043 | * non-sync IO will cause disk_stat to increase without | |
6044 | * increasing sync_io so curr_events will (eventually) | |
6045 | * be larger than it was before. Once it becomes | |
6046 | * substantially larger, the test below will cause | |
6047 | * the array to appear non-idle, and resync will slow | |
6048 | * down. | |
6049 | * If there is a lot of outstanding resync activity when | |
6050 | * we set last_event to curr_events, then all that activity | |
6051 | * completing might cause the array to appear non-idle | |
6052 | * and resync will be slowed down even though there might | |
6053 | * not have been non-resync activity. This will only | |
6054 | * happen once though. 'last_events' will soon reflect | |
6055 | * the state where there is little or no outstanding | |
6056 | * resync requests, and further resync activity will | |
6057 | * always make curr_events less than last_events. | |
c0e48521 | 6058 | * |
1da177e4 | 6059 | */ |
eea1bf38 | 6060 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6061 | rdev->last_events = curr_events; |
6062 | idle = 0; | |
6063 | } | |
6064 | } | |
4b80991c | 6065 | rcu_read_unlock(); |
1da177e4 LT |
6066 | return idle; |
6067 | } | |
6068 | ||
6069 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6070 | { | |
6071 | /* another "blocks" (512byte) blocks have been synced */ | |
6072 | atomic_sub(blocks, &mddev->recovery_active); | |
6073 | wake_up(&mddev->recovery_wait); | |
6074 | if (!ok) { | |
dfc70645 | 6075 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6076 | md_wakeup_thread(mddev->thread); |
6077 | // stop recovery, signal do_sync .... | |
6078 | } | |
6079 | } | |
6080 | ||
6081 | ||
06d91a5f N |
6082 | /* md_write_start(mddev, bi) |
6083 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6084 | * in superblock) before writing, schedule a superblock update |
6085 | * and wait for it to complete. | |
06d91a5f | 6086 | */ |
3d310eb7 | 6087 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6088 | { |
0fd62b86 | 6089 | int did_change = 0; |
06d91a5f | 6090 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6091 | return; |
06d91a5f | 6092 | |
f91de92e N |
6093 | BUG_ON(mddev->ro == 1); |
6094 | if (mddev->ro == 2) { | |
6095 | /* need to switch to read/write */ | |
6096 | mddev->ro = 0; | |
6097 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6098 | md_wakeup_thread(mddev->thread); | |
25156198 | 6099 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6100 | did_change = 1; |
f91de92e | 6101 | } |
06d91a5f | 6102 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6103 | if (mddev->safemode == 1) |
6104 | mddev->safemode = 0; | |
06d91a5f | 6105 | if (mddev->in_sync) { |
a9701a30 | 6106 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6107 | if (mddev->in_sync) { |
6108 | mddev->in_sync = 0; | |
850b2b42 | 6109 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 6110 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6111 | did_change = 1; |
3d310eb7 | 6112 | } |
a9701a30 | 6113 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6114 | } |
0fd62b86 | 6115 | if (did_change) |
b62b7590 | 6116 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
6117 | wait_event(mddev->sb_wait, |
6118 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
6119 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
6120 | } |
6121 | ||
6122 | void md_write_end(mddev_t *mddev) | |
6123 | { | |
6124 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6125 | if (mddev->safemode == 2) | |
6126 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6127 | else if (mddev->safemode_delay) |
1da177e4 LT |
6128 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6129 | } | |
6130 | } | |
6131 | ||
2a2275d6 N |
6132 | /* md_allow_write(mddev) |
6133 | * Calling this ensures that the array is marked 'active' so that writes | |
6134 | * may proceed without blocking. It is important to call this before | |
6135 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6136 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6137 | * |
6138 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6139 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6140 | */ |
b5470dc5 | 6141 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6142 | { |
6143 | if (!mddev->pers) | |
b5470dc5 | 6144 | return 0; |
2a2275d6 | 6145 | if (mddev->ro) |
b5470dc5 | 6146 | return 0; |
1a0fd497 | 6147 | if (!mddev->pers->sync_request) |
b5470dc5 | 6148 | return 0; |
2a2275d6 N |
6149 | |
6150 | spin_lock_irq(&mddev->write_lock); | |
6151 | if (mddev->in_sync) { | |
6152 | mddev->in_sync = 0; | |
6153 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6154 | if (mddev->safemode_delay && | |
6155 | mddev->safemode == 0) | |
6156 | mddev->safemode = 1; | |
6157 | spin_unlock_irq(&mddev->write_lock); | |
6158 | md_update_sb(mddev, 0); | |
b62b7590 | 6159 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
6160 | } else |
6161 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
6162 | |
6163 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
6164 | return -EAGAIN; | |
6165 | else | |
6166 | return 0; | |
2a2275d6 N |
6167 | } |
6168 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6169 | ||
1da177e4 LT |
6170 | #define SYNC_MARKS 10 |
6171 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6172 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6173 | { |
6174 | mddev_t *mddev2; | |
6175 | unsigned int currspeed = 0, | |
6176 | window; | |
57afd89f | 6177 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6178 | unsigned long mark[SYNC_MARKS]; |
6179 | sector_t mark_cnt[SYNC_MARKS]; | |
6180 | int last_mark,m; | |
6181 | struct list_head *tmp; | |
6182 | sector_t last_check; | |
57afd89f | 6183 | int skipped = 0; |
5fd6c1dc | 6184 | mdk_rdev_t *rdev; |
61df9d91 | 6185 | char *desc; |
1da177e4 LT |
6186 | |
6187 | /* just incase thread restarts... */ | |
6188 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6189 | return; | |
5fd6c1dc N |
6190 | if (mddev->ro) /* never try to sync a read-only array */ |
6191 | return; | |
1da177e4 | 6192 | |
61df9d91 N |
6193 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6194 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6195 | desc = "data-check"; | |
6196 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6197 | desc = "requested-resync"; | |
6198 | else | |
6199 | desc = "resync"; | |
6200 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6201 | desc = "reshape"; | |
6202 | else | |
6203 | desc = "recovery"; | |
6204 | ||
1da177e4 LT |
6205 | /* we overload curr_resync somewhat here. |
6206 | * 0 == not engaged in resync at all | |
6207 | * 2 == checking that there is no conflict with another sync | |
6208 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6209 | * commense | |
6210 | * other == active in resync - this many blocks | |
6211 | * | |
6212 | * Before starting a resync we must have set curr_resync to | |
6213 | * 2, and then checked that every "conflicting" array has curr_resync | |
6214 | * less than ours. When we find one that is the same or higher | |
6215 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6216 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6217 | * This will mean we have to start checking from the beginning again. | |
6218 | * | |
6219 | */ | |
6220 | ||
6221 | do { | |
6222 | mddev->curr_resync = 2; | |
6223 | ||
6224 | try_again: | |
787453c2 | 6225 | if (kthread_should_stop()) { |
6985c43f | 6226 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6227 | goto skip; |
6228 | } | |
29ac4aa3 | 6229 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6230 | if (mddev2 == mddev) |
6231 | continue; | |
90b08710 BS |
6232 | if (!mddev->parallel_resync |
6233 | && mddev2->curr_resync | |
6234 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6235 | DEFINE_WAIT(wq); |
6236 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6237 | /* arbitrarily yield */ | |
6238 | mddev->curr_resync = 1; | |
6239 | wake_up(&resync_wait); | |
6240 | } | |
6241 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6242 | /* no need to wait here, we can wait the next | |
6243 | * time 'round when curr_resync == 2 | |
6244 | */ | |
6245 | continue; | |
9744197c N |
6246 | /* We need to wait 'interruptible' so as not to |
6247 | * contribute to the load average, and not to | |
6248 | * be caught by 'softlockup' | |
6249 | */ | |
6250 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6251 | if (!kthread_should_stop() && |
8712e553 | 6252 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6253 | printk(KERN_INFO "md: delaying %s of %s" |
6254 | " until %s has finished (they" | |
1da177e4 | 6255 | " share one or more physical units)\n", |
61df9d91 | 6256 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6257 | mddev_put(mddev2); |
9744197c N |
6258 | if (signal_pending(current)) |
6259 | flush_signals(current); | |
1da177e4 LT |
6260 | schedule(); |
6261 | finish_wait(&resync_wait, &wq); | |
6262 | goto try_again; | |
6263 | } | |
6264 | finish_wait(&resync_wait, &wq); | |
6265 | } | |
6266 | } | |
6267 | } while (mddev->curr_resync < 2); | |
6268 | ||
5fd6c1dc | 6269 | j = 0; |
9d88883e | 6270 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6271 | /* resync follows the size requested by the personality, |
57afd89f | 6272 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6273 | */ |
6274 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6275 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6276 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6277 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6278 | j = mddev->resync_min; | |
6279 | else if (!mddev->bitmap) | |
5fd6c1dc | 6280 | j = mddev->recovery_cp; |
5e96ee65 | 6281 | |
ccfcc3c1 | 6282 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6283 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6284 | else { |
1da177e4 | 6285 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6286 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6287 | j = MaxSector; |
159ec1fc | 6288 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6289 | if (rdev->raid_disk >= 0 && |
6290 | !test_bit(Faulty, &rdev->flags) && | |
6291 | !test_bit(In_sync, &rdev->flags) && | |
6292 | rdev->recovery_offset < j) | |
6293 | j = rdev->recovery_offset; | |
6294 | } | |
1da177e4 | 6295 | |
61df9d91 N |
6296 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6297 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6298 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6299 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6300 | "(but not more than %d KB/sec) for %s.\n", |
6301 | speed_max(mddev), desc); | |
1da177e4 | 6302 | |
eea1bf38 | 6303 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6304 | |
57afd89f | 6305 | io_sectors = 0; |
1da177e4 LT |
6306 | for (m = 0; m < SYNC_MARKS; m++) { |
6307 | mark[m] = jiffies; | |
57afd89f | 6308 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6309 | } |
6310 | last_mark = 0; | |
6311 | mddev->resync_mark = mark[last_mark]; | |
6312 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6313 | ||
6314 | /* | |
6315 | * Tune reconstruction: | |
6316 | */ | |
6317 | window = 32*(PAGE_SIZE/512); | |
6318 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6319 | window/2,(unsigned long long) max_sectors/2); | |
6320 | ||
6321 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6322 | last_check = 0; |
6323 | ||
6324 | if (j>2) { | |
6325 | printk(KERN_INFO | |
61df9d91 N |
6326 | "md: resuming %s of %s from checkpoint.\n", |
6327 | desc, mdname(mddev)); | |
1da177e4 LT |
6328 | mddev->curr_resync = j; |
6329 | } | |
6330 | ||
6331 | while (j < max_sectors) { | |
57afd89f | 6332 | sector_t sectors; |
1da177e4 | 6333 | |
57afd89f | 6334 | skipped = 0; |
c6207277 N |
6335 | if (j >= mddev->resync_max) { |
6336 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
6337 | wait_event(mddev->recovery_wait, | |
6338 | mddev->resync_max > j | |
6339 | || kthread_should_stop()); | |
6340 | } | |
6341 | if (kthread_should_stop()) | |
6342 | goto interrupted; | |
97e4f42d N |
6343 | |
6344 | if (mddev->curr_resync > mddev->curr_resync_completed && | |
6345 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6346 | > (max_sectors >> 4)) { | |
6347 | /* time to update curr_resync_completed */ | |
6348 | blk_unplug(mddev->queue); | |
6349 | wait_event(mddev->recovery_wait, | |
6350 | atomic_read(&mddev->recovery_active) == 0); | |
6351 | mddev->curr_resync_completed = | |
6352 | mddev->curr_resync; | |
6353 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6354 | } | |
57afd89f | 6355 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6356 | currspeed < speed_min(mddev)); |
57afd89f | 6357 | if (sectors == 0) { |
dfc70645 | 6358 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6359 | goto out; |
6360 | } | |
57afd89f N |
6361 | |
6362 | if (!skipped) { /* actual IO requested */ | |
6363 | io_sectors += sectors; | |
6364 | atomic_add(sectors, &mddev->recovery_active); | |
6365 | } | |
6366 | ||
1da177e4 LT |
6367 | j += sectors; |
6368 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6369 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6370 | if (last_check == 0) |
6371 | /* this is the earliers that rebuilt will be | |
6372 | * visible in /proc/mdstat | |
6373 | */ | |
6374 | md_new_event(mddev); | |
57afd89f N |
6375 | |
6376 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6377 | continue; |
6378 | ||
57afd89f | 6379 | last_check = io_sectors; |
1da177e4 | 6380 | |
dfc70645 | 6381 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6382 | break; |
6383 | ||
6384 | repeat: | |
6385 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6386 | /* step marks */ | |
6387 | int next = (last_mark+1) % SYNC_MARKS; | |
6388 | ||
6389 | mddev->resync_mark = mark[next]; | |
6390 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6391 | mark[next] = jiffies; | |
57afd89f | 6392 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6393 | last_mark = next; |
6394 | } | |
6395 | ||
6396 | ||
c6207277 N |
6397 | if (kthread_should_stop()) |
6398 | goto interrupted; | |
6399 | ||
1da177e4 LT |
6400 | |
6401 | /* | |
6402 | * this loop exits only if either when we are slower than | |
6403 | * the 'hard' speed limit, or the system was IO-idle for | |
6404 | * a jiffy. | |
6405 | * the system might be non-idle CPU-wise, but we only care | |
6406 | * about not overloading the IO subsystem. (things like an | |
6407 | * e2fsck being done on the RAID array should execute fast) | |
6408 | */ | |
2ad8b1ef | 6409 | blk_unplug(mddev->queue); |
1da177e4 LT |
6410 | cond_resched(); |
6411 | ||
57afd89f N |
6412 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6413 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6414 | |
88202a0c N |
6415 | if (currspeed > speed_min(mddev)) { |
6416 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6417 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6418 | msleep(500); |
1da177e4 LT |
6419 | goto repeat; |
6420 | } | |
6421 | } | |
6422 | } | |
61df9d91 | 6423 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6424 | /* |
6425 | * this also signals 'finished resyncing' to md_stop | |
6426 | */ | |
6427 | out: | |
2ad8b1ef | 6428 | blk_unplug(mddev->queue); |
1da177e4 LT |
6429 | |
6430 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6431 | ||
6432 | /* tell personality that we are finished */ | |
57afd89f | 6433 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6434 | |
dfc70645 | 6435 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6436 | mddev->curr_resync > 2) { |
6437 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6438 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6439 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6440 | printk(KERN_INFO | |
61df9d91 N |
6441 | "md: checkpointing %s of %s.\n", |
6442 | desc, mdname(mddev)); | |
5fd6c1dc N |
6443 | mddev->recovery_cp = mddev->curr_resync; |
6444 | } | |
6445 | } else | |
6446 | mddev->recovery_cp = MaxSector; | |
6447 | } else { | |
6448 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6449 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6450 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6451 | if (rdev->raid_disk >= 0 && |
6452 | !test_bit(Faulty, &rdev->flags) && | |
6453 | !test_bit(In_sync, &rdev->flags) && | |
6454 | rdev->recovery_offset < mddev->curr_resync) | |
6455 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6456 | } |
1da177e4 | 6457 | } |
17571284 | 6458 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6459 | |
1da177e4 LT |
6460 | skip: |
6461 | mddev->curr_resync = 0; | |
5e96ee65 | 6462 | mddev->resync_min = 0; |
c6207277 N |
6463 | mddev->resync_max = MaxSector; |
6464 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
1da177e4 LT |
6465 | wake_up(&resync_wait); |
6466 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6467 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6468 | return; |
6469 | ||
6470 | interrupted: | |
6471 | /* | |
6472 | * got a signal, exit. | |
6473 | */ | |
6474 | printk(KERN_INFO | |
6475 | "md: md_do_sync() got signal ... exiting\n"); | |
6476 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6477 | goto out; | |
6478 | ||
1da177e4 | 6479 | } |
29269553 | 6480 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6481 | |
6482 | ||
b4c4c7b8 N |
6483 | static int remove_and_add_spares(mddev_t *mddev) |
6484 | { | |
6485 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6486 | int spares = 0; |
6487 | ||
97e4f42d N |
6488 | mddev->curr_resync_completed = 0; |
6489 | ||
159ec1fc | 6490 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6491 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6492 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6493 | (test_bit(Faulty, &rdev->flags) || |
6494 | ! test_bit(In_sync, &rdev->flags)) && | |
6495 | atomic_read(&rdev->nr_pending)==0) { | |
6496 | if (mddev->pers->hot_remove_disk( | |
6497 | mddev, rdev->raid_disk)==0) { | |
6498 | char nm[20]; | |
6499 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6500 | sysfs_remove_link(&mddev->kobj, nm); | |
6501 | rdev->raid_disk = -1; | |
6502 | } | |
6503 | } | |
6504 | ||
4044ba58 | 6505 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6506 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6507 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6508 | !test_bit(In_sync, &rdev->flags) && |
6509 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6510 | spares++; |
b4c4c7b8 N |
6511 | if (rdev->raid_disk < 0 |
6512 | && !test_bit(Faulty, &rdev->flags)) { | |
6513 | rdev->recovery_offset = 0; | |
199050ea NB |
6514 | if (mddev->pers-> |
6515 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6516 | char nm[20]; |
6517 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6518 | if (sysfs_create_link(&mddev->kobj, |
6519 | &rdev->kobj, nm)) | |
6520 | printk(KERN_WARNING | |
6521 | "md: cannot register " | |
6522 | "%s for %s\n", | |
6523 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6524 | spares++; |
6525 | md_new_event(mddev); | |
6526 | } else | |
6527 | break; | |
6528 | } | |
dfc70645 | 6529 | } |
b4c4c7b8 N |
6530 | } |
6531 | return spares; | |
6532 | } | |
1da177e4 LT |
6533 | /* |
6534 | * This routine is regularly called by all per-raid-array threads to | |
6535 | * deal with generic issues like resync and super-block update. | |
6536 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6537 | * need this as they never do any recovery or update the superblock. | |
6538 | * | |
6539 | * It does not do any resync itself, but rather "forks" off other threads | |
6540 | * to do that as needed. | |
6541 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6542 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6543 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6544 | * and wakeups up this thread which will reap the thread and finish up. |
6545 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6546 | * | |
6547 | * The overall approach is: | |
6548 | * 1/ if the superblock needs updating, update it. | |
6549 | * 2/ If a recovery thread is running, don't do anything else. | |
6550 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6551 | * 4/ If there are any faulty devices, remove them. | |
6552 | * 5/ If array is degraded, try to add spares devices | |
6553 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6554 | */ | |
6555 | void md_check_recovery(mddev_t *mddev) | |
6556 | { | |
6557 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6558 | |
6559 | ||
5f40402d N |
6560 | if (mddev->bitmap) |
6561 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
6562 | |
6563 | if (mddev->ro) | |
6564 | return; | |
fca4d848 N |
6565 | |
6566 | if (signal_pending(current)) { | |
31a59e34 | 6567 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6568 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6569 | mdname(mddev)); | |
6570 | mddev->safemode = 2; | |
6571 | } | |
6572 | flush_signals(current); | |
6573 | } | |
6574 | ||
c89a8eee N |
6575 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6576 | return; | |
1da177e4 | 6577 | if ( ! ( |
e691063a | 6578 | (mddev->flags && !mddev->external) || |
1da177e4 | 6579 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6580 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6581 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6582 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6583 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6584 | )) |
6585 | return; | |
fca4d848 | 6586 | |
df5b89b3 | 6587 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6588 | int spares = 0; |
fca4d848 | 6589 | |
c89a8eee N |
6590 | if (mddev->ro) { |
6591 | /* Only thing we do on a ro array is remove | |
6592 | * failed devices. | |
6593 | */ | |
6594 | remove_and_add_spares(mddev); | |
6595 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6596 | goto unlock; | |
6597 | } | |
6598 | ||
31a59e34 | 6599 | if (!mddev->external) { |
0fd62b86 | 6600 | int did_change = 0; |
31a59e34 N |
6601 | spin_lock_irq(&mddev->write_lock); |
6602 | if (mddev->safemode && | |
6603 | !atomic_read(&mddev->writes_pending) && | |
6604 | !mddev->in_sync && | |
6605 | mddev->recovery_cp == MaxSector) { | |
6606 | mddev->in_sync = 1; | |
0fd62b86 | 6607 | did_change = 1; |
31a59e34 N |
6608 | if (mddev->persistent) |
6609 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6610 | } | |
6611 | if (mddev->safemode == 1) | |
6612 | mddev->safemode = 0; | |
6613 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6614 | if (did_change) |
b62b7590 | 6615 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6616 | } |
fca4d848 | 6617 | |
850b2b42 N |
6618 | if (mddev->flags) |
6619 | md_update_sb(mddev, 0); | |
06d91a5f | 6620 | |
159ec1fc | 6621 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6622 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6623 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6624 | |
06d91a5f | 6625 | |
1da177e4 LT |
6626 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6627 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6628 | /* resync/recovery still happening */ | |
6629 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6630 | goto unlock; | |
6631 | } | |
6632 | if (mddev->sync_thread) { | |
6633 | /* resync has finished, collect result */ | |
6634 | md_unregister_thread(mddev->sync_thread); | |
6635 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6636 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6637 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6638 | /* success...*/ |
6639 | /* activate any spares */ | |
a99ac971 NB |
6640 | if (mddev->pers->spare_active(mddev)) |
6641 | sysfs_notify(&mddev->kobj, NULL, | |
6642 | "degraded"); | |
1da177e4 | 6643 | } |
850b2b42 | 6644 | md_update_sb(mddev, 1); |
41158c7e N |
6645 | |
6646 | /* if array is no-longer degraded, then any saved_raid_disk | |
6647 | * information must be scrapped | |
6648 | */ | |
6649 | if (!mddev->degraded) | |
159ec1fc | 6650 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6651 | rdev->saved_raid_disk = -1; |
6652 | ||
1da177e4 LT |
6653 | mddev->recovery = 0; |
6654 | /* flag recovery needed just to double check */ | |
6655 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6656 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6657 | md_new_event(mddev); |
1da177e4 LT |
6658 | goto unlock; |
6659 | } | |
72a23c21 NB |
6660 | /* Set RUNNING before clearing NEEDED to avoid |
6661 | * any transients in the value of "sync_action". | |
6662 | */ | |
6663 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6664 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6665 | /* Clear some bits that don't mean anything, but |
6666 | * might be left set | |
6667 | */ | |
24dd469d N |
6668 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6669 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6670 | |
5fd6c1dc N |
6671 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6672 | goto unlock; | |
1da177e4 LT |
6673 | /* no recovery is running. |
6674 | * remove any failed drives, then | |
6675 | * add spares if possible. | |
6676 | * Spare are also removed and re-added, to allow | |
6677 | * the personality to fail the re-add. | |
6678 | */ | |
1da177e4 | 6679 | |
b4c4c7b8 N |
6680 | if (mddev->reshape_position != MaxSector) { |
6681 | if (mddev->pers->check_reshape(mddev) != 0) | |
6682 | /* Cannot proceed */ | |
6683 | goto unlock; | |
6684 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6685 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6686 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6687 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6688 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6689 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6690 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6691 | } else if (mddev->recovery_cp < MaxSector) { |
6692 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6693 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6694 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6695 | /* nothing to be done ... */ | |
1da177e4 | 6696 | goto unlock; |
24dd469d | 6697 | |
1da177e4 | 6698 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6699 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6700 | /* We are adding a device or devices to an array | |
6701 | * which has the bitmap stored on all devices. | |
6702 | * So make sure all bitmap pages get written | |
6703 | */ | |
6704 | bitmap_write_all(mddev->bitmap); | |
6705 | } | |
1da177e4 LT |
6706 | mddev->sync_thread = md_register_thread(md_do_sync, |
6707 | mddev, | |
6708 | "%s_resync"); | |
6709 | if (!mddev->sync_thread) { | |
6710 | printk(KERN_ERR "%s: could not start resync" | |
6711 | " thread...\n", | |
6712 | mdname(mddev)); | |
6713 | /* leave the spares where they are, it shouldn't hurt */ | |
6714 | mddev->recovery = 0; | |
d7603b7e | 6715 | } else |
1da177e4 | 6716 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6717 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6718 | md_new_event(mddev); |
1da177e4 LT |
6719 | } |
6720 | unlock: | |
72a23c21 NB |
6721 | if (!mddev->sync_thread) { |
6722 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6723 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6724 | &mddev->recovery)) | |
0c3573f1 N |
6725 | if (mddev->sysfs_action) |
6726 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6727 | } |
1da177e4 LT |
6728 | mddev_unlock(mddev); |
6729 | } | |
6730 | } | |
6731 | ||
6bfe0b49 DW |
6732 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6733 | { | |
3c0ee63a | 6734 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
6735 | wait_event_timeout(rdev->blocked_wait, |
6736 | !test_bit(Blocked, &rdev->flags), | |
6737 | msecs_to_jiffies(5000)); | |
6738 | rdev_dec_pending(rdev, mddev); | |
6739 | } | |
6740 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6741 | ||
75c96f85 AB |
6742 | static int md_notify_reboot(struct notifier_block *this, |
6743 | unsigned long code, void *x) | |
1da177e4 LT |
6744 | { |
6745 | struct list_head *tmp; | |
6746 | mddev_t *mddev; | |
6747 | ||
6748 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6749 | ||
6750 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6751 | ||
29ac4aa3 | 6752 | for_each_mddev(mddev, tmp) |
c71d4887 | 6753 | if (mddev_trylock(mddev)) { |
2b25000b N |
6754 | /* Force a switch to readonly even array |
6755 | * appears to still be in use. Hence | |
6756 | * the '100'. | |
6757 | */ | |
d710e138 | 6758 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
6759 | mddev_unlock(mddev); |
6760 | } | |
1da177e4 LT |
6761 | /* |
6762 | * certain more exotic SCSI devices are known to be | |
6763 | * volatile wrt too early system reboots. While the | |
6764 | * right place to handle this issue is the given | |
6765 | * driver, we do want to have a safe RAID driver ... | |
6766 | */ | |
6767 | mdelay(1000*1); | |
6768 | } | |
6769 | return NOTIFY_DONE; | |
6770 | } | |
6771 | ||
75c96f85 | 6772 | static struct notifier_block md_notifier = { |
1da177e4 LT |
6773 | .notifier_call = md_notify_reboot, |
6774 | .next = NULL, | |
6775 | .priority = INT_MAX, /* before any real devices */ | |
6776 | }; | |
6777 | ||
6778 | static void md_geninit(void) | |
6779 | { | |
1da177e4 LT |
6780 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
6781 | ||
c7705f34 | 6782 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
6783 | } |
6784 | ||
75c96f85 | 6785 | static int __init md_init(void) |
1da177e4 | 6786 | { |
3dbd8c2e | 6787 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
6788 | return -1; |
6789 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 6790 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
6791 | return -1; |
6792 | } | |
3dbd8c2e | 6793 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
6794 | md_probe, NULL, NULL); |
6795 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
6796 | md_probe, NULL, NULL); |
6797 | ||
1da177e4 | 6798 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 6799 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
6800 | |
6801 | md_geninit(); | |
d710e138 | 6802 | return 0; |
1da177e4 LT |
6803 | } |
6804 | ||
6805 | ||
6806 | #ifndef MODULE | |
6807 | ||
6808 | /* | |
6809 | * Searches all registered partitions for autorun RAID arrays | |
6810 | * at boot time. | |
6811 | */ | |
4d936ec1 ME |
6812 | |
6813 | static LIST_HEAD(all_detected_devices); | |
6814 | struct detected_devices_node { | |
6815 | struct list_head list; | |
6816 | dev_t dev; | |
6817 | }; | |
1da177e4 LT |
6818 | |
6819 | void md_autodetect_dev(dev_t dev) | |
6820 | { | |
4d936ec1 ME |
6821 | struct detected_devices_node *node_detected_dev; |
6822 | ||
6823 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6824 | if (node_detected_dev) { | |
6825 | node_detected_dev->dev = dev; | |
6826 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6827 | } else { | |
6828 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6829 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6830 | } | |
1da177e4 LT |
6831 | } |
6832 | ||
6833 | ||
6834 | static void autostart_arrays(int part) | |
6835 | { | |
6836 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
6837 | struct detected_devices_node *node_detected_dev; |
6838 | dev_t dev; | |
6839 | int i_scanned, i_passed; | |
1da177e4 | 6840 | |
4d936ec1 ME |
6841 | i_scanned = 0; |
6842 | i_passed = 0; | |
1da177e4 | 6843 | |
4d936ec1 | 6844 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 6845 | |
4d936ec1 ME |
6846 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
6847 | i_scanned++; | |
6848 | node_detected_dev = list_entry(all_detected_devices.next, | |
6849 | struct detected_devices_node, list); | |
6850 | list_del(&node_detected_dev->list); | |
6851 | dev = node_detected_dev->dev; | |
6852 | kfree(node_detected_dev); | |
df968c4e | 6853 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
6854 | if (IS_ERR(rdev)) |
6855 | continue; | |
6856 | ||
b2d444d7 | 6857 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6858 | MD_BUG(); |
6859 | continue; | |
6860 | } | |
d0fae18f | 6861 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 6862 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 6863 | i_passed++; |
1da177e4 | 6864 | } |
4d936ec1 ME |
6865 | |
6866 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6867 | i_scanned, i_passed); | |
1da177e4 LT |
6868 | |
6869 | autorun_devices(part); | |
6870 | } | |
6871 | ||
fdee8ae4 | 6872 | #endif /* !MODULE */ |
1da177e4 LT |
6873 | |
6874 | static __exit void md_exit(void) | |
6875 | { | |
6876 | mddev_t *mddev; | |
6877 | struct list_head *tmp; | |
8ab5e4c1 | 6878 | |
3dbd8c2e | 6879 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 6880 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 6881 | |
3dbd8c2e | 6882 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
6883 | unregister_blkdev(mdp_major, "mdp"); |
6884 | unregister_reboot_notifier(&md_notifier); | |
6885 | unregister_sysctl_table(raid_table_header); | |
6886 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 6887 | for_each_mddev(mddev, tmp) { |
1da177e4 | 6888 | export_array(mddev); |
d3374825 | 6889 | mddev->hold_active = 0; |
1da177e4 LT |
6890 | } |
6891 | } | |
6892 | ||
685784aa | 6893 | subsys_initcall(md_init); |
1da177e4 LT |
6894 | module_exit(md_exit) |
6895 | ||
f91de92e N |
6896 | static int get_ro(char *buffer, struct kernel_param *kp) |
6897 | { | |
6898 | return sprintf(buffer, "%d", start_readonly); | |
6899 | } | |
6900 | static int set_ro(const char *val, struct kernel_param *kp) | |
6901 | { | |
6902 | char *e; | |
6903 | int num = simple_strtoul(val, &e, 10); | |
6904 | if (*val && (*e == '\0' || *e == '\n')) { | |
6905 | start_readonly = num; | |
4dbcdc75 | 6906 | return 0; |
f91de92e N |
6907 | } |
6908 | return -EINVAL; | |
6909 | } | |
6910 | ||
80ca3a44 N |
6911 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
6912 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 6913 | |
efeb53c0 | 6914 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 6915 | |
1da177e4 LT |
6916 | EXPORT_SYMBOL(register_md_personality); |
6917 | EXPORT_SYMBOL(unregister_md_personality); | |
6918 | EXPORT_SYMBOL(md_error); | |
6919 | EXPORT_SYMBOL(md_done_sync); | |
6920 | EXPORT_SYMBOL(md_write_start); | |
6921 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
6922 | EXPORT_SYMBOL(md_register_thread); |
6923 | EXPORT_SYMBOL(md_unregister_thread); | |
6924 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
6925 | EXPORT_SYMBOL(md_check_recovery); |
6926 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 6927 | MODULE_ALIAS("md"); |
72008652 | 6928 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |