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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 | ||
22 | - persistent bitmap code | |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
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 | ||
35 | #include <linux/kthread.h> | |
36 | #include <linux/blkdev.h> | |
37 | #include <linux/sysctl.h> | |
38 | #include <linux/seq_file.h> | |
39 | #include <linux/buffer_head.h> /* for invalidate_bdev */ | |
40 | #include <linux/poll.h> | |
41 | #include <linux/ctype.h> | |
42 | #include <linux/hdreg.h> | |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/random.h> | |
45 | #include <linux/reboot.h> | |
46 | #include <linux/file.h> | |
47 | #include <linux/delay.h> | |
48 | #include <linux/raid/md_p.h> | |
49 | #include <linux/raid/md_u.h> | |
50 | #include "md.h" | |
51 | #include "bitmap.h" | |
52 | ||
53 | #define DEBUG 0 | |
54 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
55 | ||
56 | ||
57 | #ifndef MODULE | |
58 | static void autostart_arrays(int part); | |
59 | #endif | |
60 | ||
61 | static LIST_HEAD(pers_list); | |
62 | static DEFINE_SPINLOCK(pers_lock); | |
63 | ||
64 | static void md_print_devices(void); | |
65 | ||
66 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); | |
67 | ||
68 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } | |
69 | ||
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 | |
74 | * the RAID driver will use the maximum available bandwidth if the IO | |
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. | |
80 | * or /sys/block/mdX/md/sync_speed_{min,max} | |
81 | */ | |
82 | ||
83 | static int sysctl_speed_limit_min = 1000; | |
84 | static int sysctl_speed_limit_max = 200000; | |
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 | } | |
96 | ||
97 | static struct ctl_table_header *raid_table_header; | |
98 | ||
99 | static ctl_table raid_table[] = { | |
100 | { | |
101 | .procname = "speed_limit_min", | |
102 | .data = &sysctl_speed_limit_min, | |
103 | .maxlen = sizeof(int), | |
104 | .mode = S_IRUGO|S_IWUSR, | |
105 | .proc_handler = proc_dointvec, | |
106 | }, | |
107 | { | |
108 | .procname = "speed_limit_max", | |
109 | .data = &sysctl_speed_limit_max, | |
110 | .maxlen = sizeof(int), | |
111 | .mode = S_IRUGO|S_IWUSR, | |
112 | .proc_handler = proc_dointvec, | |
113 | }, | |
114 | { } | |
115 | }; | |
116 | ||
117 | static ctl_table raid_dir_table[] = { | |
118 | { | |
119 | .procname = "raid", | |
120 | .maxlen = 0, | |
121 | .mode = S_IRUGO|S_IXUGO, | |
122 | .child = raid_table, | |
123 | }, | |
124 | { } | |
125 | }; | |
126 | ||
127 | static ctl_table raid_root_table[] = { | |
128 | { | |
129 | .procname = "dev", | |
130 | .maxlen = 0, | |
131 | .mode = 0555, | |
132 | .child = raid_dir_table, | |
133 | }, | |
134 | { } | |
135 | }; | |
136 | ||
137 | static const struct block_device_operations md_fops; | |
138 | ||
139 | static int start_readonly; | |
140 | ||
141 | /* | |
142 | * We have a system wide 'event count' that is incremented | |
143 | * on any 'interesting' event, and readers of /proc/mdstat | |
144 | * can use 'poll' or 'select' to find out when the event | |
145 | * count increases. | |
146 | * | |
147 | * Events are: | |
148 | * start array, stop array, error, add device, remove device, | |
149 | * start build, activate spare | |
150 | */ | |
151 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); | |
152 | static atomic_t md_event_count; | |
153 | void md_new_event(mddev_t *mddev) | |
154 | { | |
155 | atomic_inc(&md_event_count); | |
156 | wake_up(&md_event_waiters); | |
157 | } | |
158 | EXPORT_SYMBOL_GPL(md_new_event); | |
159 | ||
160 | /* Alternate version that can be called from interrupts | |
161 | * when calling sysfs_notify isn't needed. | |
162 | */ | |
163 | static void md_new_event_inintr(mddev_t *mddev) | |
164 | { | |
165 | atomic_inc(&md_event_count); | |
166 | wake_up(&md_event_waiters); | |
167 | } | |
168 | ||
169 | /* | |
170 | * Enables to iterate over all existing md arrays | |
171 | * all_mddevs_lock protects this list. | |
172 | */ | |
173 | static LIST_HEAD(all_mddevs); | |
174 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
175 | ||
176 | ||
177 | /* | |
178 | * iterates through all used mddevs in the system. | |
179 | * We take care to grab the all_mddevs_lock whenever navigating | |
180 | * the list, and to always hold a refcount when unlocked. | |
181 | * Any code which breaks out of this loop while own | |
182 | * a reference to the current mddev and must mddev_put it. | |
183 | */ | |
184 | #define for_each_mddev(mddev,tmp) \ | |
185 | \ | |
186 | for (({ spin_lock(&all_mddevs_lock); \ | |
187 | tmp = all_mddevs.next; \ | |
188 | mddev = NULL;}); \ | |
189 | ({ if (tmp != &all_mddevs) \ | |
190 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
191 | spin_unlock(&all_mddevs_lock); \ | |
192 | if (mddev) mddev_put(mddev); \ | |
193 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
194 | tmp != &all_mddevs;}); \ | |
195 | ({ spin_lock(&all_mddevs_lock); \ | |
196 | tmp = tmp->next;}) \ | |
197 | ) | |
198 | ||
199 | ||
200 | /* Rather than calling directly into the personality make_request function, | |
201 | * IO requests come here first so that we can check if the device is | |
202 | * being suspended pending a reconfiguration. | |
203 | * We hold a refcount over the call to ->make_request. By the time that | |
204 | * call has finished, the bio has been linked into some internal structure | |
205 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
206 | */ | |
207 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
208 | { | |
209 | mddev_t *mddev = q->queuedata; | |
210 | int rv; | |
211 | if (mddev == NULL || mddev->pers == NULL) { | |
212 | bio_io_error(bio); | |
213 | return 0; | |
214 | } | |
215 | rcu_read_lock(); | |
216 | if (mddev->suspended) { | |
217 | DEFINE_WAIT(__wait); | |
218 | for (;;) { | |
219 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
220 | TASK_UNINTERRUPTIBLE); | |
221 | if (!mddev->suspended) | |
222 | break; | |
223 | rcu_read_unlock(); | |
224 | schedule(); | |
225 | rcu_read_lock(); | |
226 | } | |
227 | finish_wait(&mddev->sb_wait, &__wait); | |
228 | } | |
229 | atomic_inc(&mddev->active_io); | |
230 | rcu_read_unlock(); | |
231 | rv = mddev->pers->make_request(q, bio); | |
232 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) | |
233 | wake_up(&mddev->sb_wait); | |
234 | ||
235 | return rv; | |
236 | } | |
237 | ||
238 | static void mddev_suspend(mddev_t *mddev) | |
239 | { | |
240 | BUG_ON(mddev->suspended); | |
241 | mddev->suspended = 1; | |
242 | synchronize_rcu(); | |
243 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
244 | mddev->pers->quiesce(mddev, 1); | |
245 | md_unregister_thread(mddev->thread); | |
246 | mddev->thread = NULL; | |
247 | /* we now know that no code is executing in the personality module, | |
248 | * except possibly the tail end of a ->bi_end_io function, but that | |
249 | * is certain to complete before the module has a chance to get | |
250 | * unloaded | |
251 | */ | |
252 | } | |
253 | ||
254 | static void mddev_resume(mddev_t *mddev) | |
255 | { | |
256 | mddev->suspended = 0; | |
257 | wake_up(&mddev->sb_wait); | |
258 | mddev->pers->quiesce(mddev, 0); | |
259 | } | |
260 | ||
261 | int mddev_congested(mddev_t *mddev, int bits) | |
262 | { | |
263 | return mddev->suspended; | |
264 | } | |
265 | EXPORT_SYMBOL(mddev_congested); | |
266 | ||
267 | ||
268 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
269 | { | |
270 | atomic_inc(&mddev->active); | |
271 | return mddev; | |
272 | } | |
273 | ||
274 | static void mddev_delayed_delete(struct work_struct *ws); | |
275 | ||
276 | static void mddev_put(mddev_t *mddev) | |
277 | { | |
278 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
279 | return; | |
280 | if (!mddev->raid_disks && list_empty(&mddev->disks) && | |
281 | !mddev->hold_active) { | |
282 | list_del(&mddev->all_mddevs); | |
283 | if (mddev->gendisk) { | |
284 | /* we did a probe so need to clean up. | |
285 | * Call schedule_work inside the spinlock | |
286 | * so that flush_scheduled_work() after | |
287 | * mddev_find will succeed in waiting for the | |
288 | * work to be done. | |
289 | */ | |
290 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
291 | schedule_work(&mddev->del_work); | |
292 | } else | |
293 | kfree(mddev); | |
294 | } | |
295 | spin_unlock(&all_mddevs_lock); | |
296 | } | |
297 | ||
298 | static mddev_t * mddev_find(dev_t unit) | |
299 | { | |
300 | mddev_t *mddev, *new = NULL; | |
301 | ||
302 | retry: | |
303 | spin_lock(&all_mddevs_lock); | |
304 | ||
305 | if (unit) { | |
306 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
307 | if (mddev->unit == unit) { | |
308 | mddev_get(mddev); | |
309 | spin_unlock(&all_mddevs_lock); | |
310 | kfree(new); | |
311 | return mddev; | |
312 | } | |
313 | ||
314 | if (new) { | |
315 | list_add(&new->all_mddevs, &all_mddevs); | |
316 | spin_unlock(&all_mddevs_lock); | |
317 | new->hold_active = UNTIL_IOCTL; | |
318 | return new; | |
319 | } | |
320 | } else if (new) { | |
321 | /* find an unused unit number */ | |
322 | static int next_minor = 512; | |
323 | int start = next_minor; | |
324 | int is_free = 0; | |
325 | int dev = 0; | |
326 | while (!is_free) { | |
327 | dev = MKDEV(MD_MAJOR, next_minor); | |
328 | next_minor++; | |
329 | if (next_minor > MINORMASK) | |
330 | next_minor = 0; | |
331 | if (next_minor == start) { | |
332 | /* Oh dear, all in use. */ | |
333 | spin_unlock(&all_mddevs_lock); | |
334 | kfree(new); | |
335 | return NULL; | |
336 | } | |
337 | ||
338 | is_free = 1; | |
339 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
340 | if (mddev->unit == dev) { | |
341 | is_free = 0; | |
342 | break; | |
343 | } | |
344 | } | |
345 | new->unit = dev; | |
346 | new->md_minor = MINOR(dev); | |
347 | new->hold_active = UNTIL_STOP; | |
348 | list_add(&new->all_mddevs, &all_mddevs); | |
349 | spin_unlock(&all_mddevs_lock); | |
350 | return new; | |
351 | } | |
352 | spin_unlock(&all_mddevs_lock); | |
353 | ||
354 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
355 | if (!new) | |
356 | return NULL; | |
357 | ||
358 | new->unit = unit; | |
359 | if (MAJOR(unit) == MD_MAJOR) | |
360 | new->md_minor = MINOR(unit); | |
361 | else | |
362 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
363 | ||
364 | mutex_init(&new->open_mutex); | |
365 | mutex_init(&new->reconfig_mutex); | |
366 | INIT_LIST_HEAD(&new->disks); | |
367 | INIT_LIST_HEAD(&new->all_mddevs); | |
368 | init_timer(&new->safemode_timer); | |
369 | atomic_set(&new->active, 1); | |
370 | atomic_set(&new->openers, 0); | |
371 | atomic_set(&new->active_io, 0); | |
372 | spin_lock_init(&new->write_lock); | |
373 | init_waitqueue_head(&new->sb_wait); | |
374 | init_waitqueue_head(&new->recovery_wait); | |
375 | new->reshape_position = MaxSector; | |
376 | new->resync_min = 0; | |
377 | new->resync_max = MaxSector; | |
378 | new->level = LEVEL_NONE; | |
379 | ||
380 | goto retry; | |
381 | } | |
382 | ||
383 | static inline int mddev_lock(mddev_t * mddev) | |
384 | { | |
385 | return mutex_lock_interruptible(&mddev->reconfig_mutex); | |
386 | } | |
387 | ||
388 | static inline int mddev_is_locked(mddev_t *mddev) | |
389 | { | |
390 | return mutex_is_locked(&mddev->reconfig_mutex); | |
391 | } | |
392 | ||
393 | static inline int mddev_trylock(mddev_t * mddev) | |
394 | { | |
395 | return mutex_trylock(&mddev->reconfig_mutex); | |
396 | } | |
397 | ||
398 | static inline void mddev_unlock(mddev_t * mddev) | |
399 | { | |
400 | mutex_unlock(&mddev->reconfig_mutex); | |
401 | ||
402 | md_wakeup_thread(mddev->thread); | |
403 | } | |
404 | ||
405 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) | |
406 | { | |
407 | mdk_rdev_t *rdev; | |
408 | ||
409 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
410 | if (rdev->desc_nr == nr) | |
411 | return rdev; | |
412 | ||
413 | return NULL; | |
414 | } | |
415 | ||
416 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
417 | { | |
418 | mdk_rdev_t *rdev; | |
419 | ||
420 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
421 | if (rdev->bdev->bd_dev == dev) | |
422 | return rdev; | |
423 | ||
424 | return NULL; | |
425 | } | |
426 | ||
427 | static struct mdk_personality *find_pers(int level, char *clevel) | |
428 | { | |
429 | struct mdk_personality *pers; | |
430 | list_for_each_entry(pers, &pers_list, list) { | |
431 | if (level != LEVEL_NONE && pers->level == level) | |
432 | return pers; | |
433 | if (strcmp(pers->name, clevel)==0) | |
434 | return pers; | |
435 | } | |
436 | return NULL; | |
437 | } | |
438 | ||
439 | /* return the offset of the super block in 512byte sectors */ | |
440 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) | |
441 | { | |
442 | sector_t num_sectors = bdev->bd_inode->i_size / 512; | |
443 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
444 | } | |
445 | ||
446 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
447 | { | |
448 | if (rdev->sb_page) | |
449 | MD_BUG(); | |
450 | ||
451 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
452 | if (!rdev->sb_page) { | |
453 | printk(KERN_ALERT "md: out of memory.\n"); | |
454 | return -ENOMEM; | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | static void free_disk_sb(mdk_rdev_t * rdev) | |
461 | { | |
462 | if (rdev->sb_page) { | |
463 | put_page(rdev->sb_page); | |
464 | rdev->sb_loaded = 0; | |
465 | rdev->sb_page = NULL; | |
466 | rdev->sb_start = 0; | |
467 | rdev->sectors = 0; | |
468 | } | |
469 | } | |
470 | ||
471 | ||
472 | static void super_written(struct bio *bio, int error) | |
473 | { | |
474 | mdk_rdev_t *rdev = bio->bi_private; | |
475 | mddev_t *mddev = rdev->mddev; | |
476 | ||
477 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
478 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
479 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
480 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
481 | md_error(mddev, rdev); | |
482 | } | |
483 | ||
484 | if (atomic_dec_and_test(&mddev->pending_writes)) | |
485 | wake_up(&mddev->sb_wait); | |
486 | bio_put(bio); | |
487 | } | |
488 | ||
489 | static void super_written_barrier(struct bio *bio, int error) | |
490 | { | |
491 | struct bio *bio2 = bio->bi_private; | |
492 | mdk_rdev_t *rdev = bio2->bi_private; | |
493 | mddev_t *mddev = rdev->mddev; | |
494 | ||
495 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
496 | error == -EOPNOTSUPP) { | |
497 | unsigned long flags; | |
498 | /* barriers don't appear to be supported :-( */ | |
499 | set_bit(BarriersNotsupp, &rdev->flags); | |
500 | mddev->barriers_work = 0; | |
501 | spin_lock_irqsave(&mddev->write_lock, flags); | |
502 | bio2->bi_next = mddev->biolist; | |
503 | mddev->biolist = bio2; | |
504 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
505 | wake_up(&mddev->sb_wait); | |
506 | bio_put(bio); | |
507 | } else { | |
508 | bio_put(bio2); | |
509 | bio->bi_private = rdev; | |
510 | super_written(bio, error); | |
511 | } | |
512 | } | |
513 | ||
514 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
515 | sector_t sector, int size, struct page *page) | |
516 | { | |
517 | /* write first size bytes of page to sector of rdev | |
518 | * Increment mddev->pending_writes before returning | |
519 | * and decrement it on completion, waking up sb_wait | |
520 | * if zero is reached. | |
521 | * If an error occurred, call md_error | |
522 | * | |
523 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
524 | * causes ENOTSUPP, we allocate a spare bio... | |
525 | */ | |
526 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
527 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); | |
528 | ||
529 | bio->bi_bdev = rdev->bdev; | |
530 | bio->bi_sector = sector; | |
531 | bio_add_page(bio, page, size, 0); | |
532 | bio->bi_private = rdev; | |
533 | bio->bi_end_io = super_written; | |
534 | bio->bi_rw = rw; | |
535 | ||
536 | atomic_inc(&mddev->pending_writes); | |
537 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { | |
538 | struct bio *rbio; | |
539 | rw |= (1<<BIO_RW_BARRIER); | |
540 | rbio = bio_clone(bio, GFP_NOIO); | |
541 | rbio->bi_private = bio; | |
542 | rbio->bi_end_io = super_written_barrier; | |
543 | submit_bio(rw, rbio); | |
544 | } else | |
545 | submit_bio(rw, bio); | |
546 | } | |
547 | ||
548 | void md_super_wait(mddev_t *mddev) | |
549 | { | |
550 | /* wait for all superblock writes that were scheduled to complete. | |
551 | * if any had to be retried (due to BARRIER problems), retry them | |
552 | */ | |
553 | DEFINE_WAIT(wq); | |
554 | for(;;) { | |
555 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
556 | if (atomic_read(&mddev->pending_writes)==0) | |
557 | break; | |
558 | while (mddev->biolist) { | |
559 | struct bio *bio; | |
560 | spin_lock_irq(&mddev->write_lock); | |
561 | bio = mddev->biolist; | |
562 | mddev->biolist = bio->bi_next ; | |
563 | bio->bi_next = NULL; | |
564 | spin_unlock_irq(&mddev->write_lock); | |
565 | submit_bio(bio->bi_rw, bio); | |
566 | } | |
567 | schedule(); | |
568 | } | |
569 | finish_wait(&mddev->sb_wait, &wq); | |
570 | } | |
571 | ||
572 | static void bi_complete(struct bio *bio, int error) | |
573 | { | |
574 | complete((struct completion*)bio->bi_private); | |
575 | } | |
576 | ||
577 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, | |
578 | struct page *page, int rw) | |
579 | { | |
580 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
581 | struct completion event; | |
582 | int ret; | |
583 | ||
584 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); | |
585 | ||
586 | bio->bi_bdev = bdev; | |
587 | bio->bi_sector = sector; | |
588 | bio_add_page(bio, page, size, 0); | |
589 | init_completion(&event); | |
590 | bio->bi_private = &event; | |
591 | bio->bi_end_io = bi_complete; | |
592 | submit_bio(rw, bio); | |
593 | wait_for_completion(&event); | |
594 | ||
595 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
596 | bio_put(bio); | |
597 | return ret; | |
598 | } | |
599 | EXPORT_SYMBOL_GPL(sync_page_io); | |
600 | ||
601 | static int read_disk_sb(mdk_rdev_t * rdev, int size) | |
602 | { | |
603 | char b[BDEVNAME_SIZE]; | |
604 | if (!rdev->sb_page) { | |
605 | MD_BUG(); | |
606 | return -EINVAL; | |
607 | } | |
608 | if (rdev->sb_loaded) | |
609 | return 0; | |
610 | ||
611 | ||
612 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) | |
613 | goto fail; | |
614 | rdev->sb_loaded = 1; | |
615 | return 0; | |
616 | ||
617 | fail: | |
618 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
619 | bdevname(rdev->bdev,b)); | |
620 | return -EINVAL; | |
621 | } | |
622 | ||
623 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
624 | { | |
625 | return sb1->set_uuid0 == sb2->set_uuid0 && | |
626 | sb1->set_uuid1 == sb2->set_uuid1 && | |
627 | sb1->set_uuid2 == sb2->set_uuid2 && | |
628 | sb1->set_uuid3 == sb2->set_uuid3; | |
629 | } | |
630 | ||
631 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
632 | { | |
633 | int ret; | |
634 | mdp_super_t *tmp1, *tmp2; | |
635 | ||
636 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
637 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
638 | ||
639 | if (!tmp1 || !tmp2) { | |
640 | ret = 0; | |
641 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); | |
642 | goto abort; | |
643 | } | |
644 | ||
645 | *tmp1 = *sb1; | |
646 | *tmp2 = *sb2; | |
647 | ||
648 | /* | |
649 | * nr_disks is not constant | |
650 | */ | |
651 | tmp1->nr_disks = 0; | |
652 | tmp2->nr_disks = 0; | |
653 | ||
654 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); | |
655 | abort: | |
656 | kfree(tmp1); | |
657 | kfree(tmp2); | |
658 | return ret; | |
659 | } | |
660 | ||
661 | ||
662 | static u32 md_csum_fold(u32 csum) | |
663 | { | |
664 | csum = (csum & 0xffff) + (csum >> 16); | |
665 | return (csum & 0xffff) + (csum >> 16); | |
666 | } | |
667 | ||
668 | static unsigned int calc_sb_csum(mdp_super_t * sb) | |
669 | { | |
670 | u64 newcsum = 0; | |
671 | u32 *sb32 = (u32*)sb; | |
672 | int i; | |
673 | unsigned int disk_csum, csum; | |
674 | ||
675 | disk_csum = sb->sb_csum; | |
676 | sb->sb_csum = 0; | |
677 | ||
678 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
679 | newcsum += sb32[i]; | |
680 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
681 | ||
682 | ||
683 | #ifdef CONFIG_ALPHA | |
684 | /* This used to use csum_partial, which was wrong for several | |
685 | * reasons including that different results are returned on | |
686 | * different architectures. It isn't critical that we get exactly | |
687 | * the same return value as before (we always csum_fold before | |
688 | * testing, and that removes any differences). However as we | |
689 | * know that csum_partial always returned a 16bit value on | |
690 | * alphas, do a fold to maximise conformity to previous behaviour. | |
691 | */ | |
692 | sb->sb_csum = md_csum_fold(disk_csum); | |
693 | #else | |
694 | sb->sb_csum = disk_csum; | |
695 | #endif | |
696 | return csum; | |
697 | } | |
698 | ||
699 | ||
700 | /* | |
701 | * Handle superblock details. | |
702 | * We want to be able to handle multiple superblock formats | |
703 | * so we have a common interface to them all, and an array of | |
704 | * different handlers. | |
705 | * We rely on user-space to write the initial superblock, and support | |
706 | * reading and updating of superblocks. | |
707 | * Interface methods are: | |
708 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
709 | * loads and validates a superblock on dev. | |
710 | * if refdev != NULL, compare superblocks on both devices | |
711 | * Return: | |
712 | * 0 - dev has a superblock that is compatible with refdev | |
713 | * 1 - dev has a superblock that is compatible and newer than refdev | |
714 | * so dev should be used as the refdev in future | |
715 | * -EINVAL superblock incompatible or invalid | |
716 | * -othererror e.g. -EIO | |
717 | * | |
718 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
719 | * Verify that dev is acceptable into mddev. | |
720 | * The first time, mddev->raid_disks will be 0, and data from | |
721 | * dev should be merged in. Subsequent calls check that dev | |
722 | * is new enough. Return 0 or -EINVAL | |
723 | * | |
724 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
725 | * Update the superblock for rdev with data in mddev | |
726 | * This does not write to disc. | |
727 | * | |
728 | */ | |
729 | ||
730 | struct super_type { | |
731 | char *name; | |
732 | struct module *owner; | |
733 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
734 | int minor_version); | |
735 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
736 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
737 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
738 | sector_t num_sectors); | |
739 | }; | |
740 | ||
741 | /* | |
742 | * Check that the given mddev has no bitmap. | |
743 | * | |
744 | * This function is called from the run method of all personalities that do not | |
745 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
746 | * has a bitmap. Otherwise, it returns 0. | |
747 | * | |
748 | */ | |
749 | int md_check_no_bitmap(mddev_t *mddev) | |
750 | { | |
751 | if (!mddev->bitmap_file && !mddev->bitmap_offset) | |
752 | return 0; | |
753 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
754 | mdname(mddev), mddev->pers->name); | |
755 | return 1; | |
756 | } | |
757 | EXPORT_SYMBOL(md_check_no_bitmap); | |
758 | ||
759 | /* | |
760 | * load_super for 0.90.0 | |
761 | */ | |
762 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
763 | { | |
764 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
765 | mdp_super_t *sb; | |
766 | int ret; | |
767 | ||
768 | /* | |
769 | * Calculate the position of the superblock (512byte sectors), | |
770 | * it's at the end of the disk. | |
771 | * | |
772 | * It also happens to be a multiple of 4Kb. | |
773 | */ | |
774 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); | |
775 | ||
776 | ret = read_disk_sb(rdev, MD_SB_BYTES); | |
777 | if (ret) return ret; | |
778 | ||
779 | ret = -EINVAL; | |
780 | ||
781 | bdevname(rdev->bdev, b); | |
782 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
783 | ||
784 | if (sb->md_magic != MD_SB_MAGIC) { | |
785 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
786 | b); | |
787 | goto abort; | |
788 | } | |
789 | ||
790 | if (sb->major_version != 0 || | |
791 | sb->minor_version < 90 || | |
792 | sb->minor_version > 91) { | |
793 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", | |
794 | sb->major_version, sb->minor_version, | |
795 | b); | |
796 | goto abort; | |
797 | } | |
798 | ||
799 | if (sb->raid_disks <= 0) | |
800 | goto abort; | |
801 | ||
802 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { | |
803 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", | |
804 | b); | |
805 | goto abort; | |
806 | } | |
807 | ||
808 | rdev->preferred_minor = sb->md_minor; | |
809 | rdev->data_offset = 0; | |
810 | rdev->sb_size = MD_SB_BYTES; | |
811 | ||
812 | if (sb->level == LEVEL_MULTIPATH) | |
813 | rdev->desc_nr = -1; | |
814 | else | |
815 | rdev->desc_nr = sb->this_disk.number; | |
816 | ||
817 | if (!refdev) { | |
818 | ret = 1; | |
819 | } else { | |
820 | __u64 ev1, ev2; | |
821 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
822 | if (!uuid_equal(refsb, sb)) { | |
823 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
824 | b, bdevname(refdev->bdev,b2)); | |
825 | goto abort; | |
826 | } | |
827 | if (!sb_equal(refsb, sb)) { | |
828 | printk(KERN_WARNING "md: %s has same UUID" | |
829 | " but different superblock to %s\n", | |
830 | b, bdevname(refdev->bdev, b2)); | |
831 | goto abort; | |
832 | } | |
833 | ev1 = md_event(sb); | |
834 | ev2 = md_event(refsb); | |
835 | if (ev1 > ev2) | |
836 | ret = 1; | |
837 | else | |
838 | ret = 0; | |
839 | } | |
840 | rdev->sectors = rdev->sb_start; | |
841 | ||
842 | if (rdev->sectors < sb->size * 2 && sb->level > 1) | |
843 | /* "this cannot possibly happen" ... */ | |
844 | ret = -EINVAL; | |
845 | ||
846 | abort: | |
847 | return ret; | |
848 | } | |
849 | ||
850 | /* | |
851 | * validate_super for 0.90.0 | |
852 | */ | |
853 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
854 | { | |
855 | mdp_disk_t *desc; | |
856 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
857 | __u64 ev1 = md_event(sb); | |
858 | ||
859 | rdev->raid_disk = -1; | |
860 | clear_bit(Faulty, &rdev->flags); | |
861 | clear_bit(In_sync, &rdev->flags); | |
862 | clear_bit(WriteMostly, &rdev->flags); | |
863 | clear_bit(BarriersNotsupp, &rdev->flags); | |
864 | ||
865 | if (mddev->raid_disks == 0) { | |
866 | mddev->major_version = 0; | |
867 | mddev->minor_version = sb->minor_version; | |
868 | mddev->patch_version = sb->patch_version; | |
869 | mddev->external = 0; | |
870 | mddev->chunk_sectors = sb->chunk_size >> 9; | |
871 | mddev->ctime = sb->ctime; | |
872 | mddev->utime = sb->utime; | |
873 | mddev->level = sb->level; | |
874 | mddev->clevel[0] = 0; | |
875 | mddev->layout = sb->layout; | |
876 | mddev->raid_disks = sb->raid_disks; | |
877 | mddev->dev_sectors = sb->size * 2; | |
878 | mddev->events = ev1; | |
879 | mddev->bitmap_offset = 0; | |
880 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; | |
881 | ||
882 | if (mddev->minor_version >= 91) { | |
883 | mddev->reshape_position = sb->reshape_position; | |
884 | mddev->delta_disks = sb->delta_disks; | |
885 | mddev->new_level = sb->new_level; | |
886 | mddev->new_layout = sb->new_layout; | |
887 | mddev->new_chunk_sectors = sb->new_chunk >> 9; | |
888 | } else { | |
889 | mddev->reshape_position = MaxSector; | |
890 | mddev->delta_disks = 0; | |
891 | mddev->new_level = mddev->level; | |
892 | mddev->new_layout = mddev->layout; | |
893 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
894 | } | |
895 | ||
896 | if (sb->state & (1<<MD_SB_CLEAN)) | |
897 | mddev->recovery_cp = MaxSector; | |
898 | else { | |
899 | if (sb->events_hi == sb->cp_events_hi && | |
900 | sb->events_lo == sb->cp_events_lo) { | |
901 | mddev->recovery_cp = sb->recovery_cp; | |
902 | } else | |
903 | mddev->recovery_cp = 0; | |
904 | } | |
905 | ||
906 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
907 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
908 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
909 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
910 | ||
911 | mddev->max_disks = MD_SB_DISKS; | |
912 | ||
913 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
914 | mddev->bitmap_file == NULL) | |
915 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
916 | ||
917 | } else if (mddev->pers == NULL) { | |
918 | /* Insist on good event counter while assembling */ | |
919 | ++ev1; | |
920 | if (ev1 < mddev->events) | |
921 | return -EINVAL; | |
922 | } else if (mddev->bitmap) { | |
923 | /* if adding to array with a bitmap, then we can accept an | |
924 | * older device ... but not too old. | |
925 | */ | |
926 | if (ev1 < mddev->bitmap->events_cleared) | |
927 | return 0; | |
928 | } else { | |
929 | if (ev1 < mddev->events) | |
930 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
931 | return 0; | |
932 | } | |
933 | ||
934 | if (mddev->level != LEVEL_MULTIPATH) { | |
935 | desc = sb->disks + rdev->desc_nr; | |
936 | ||
937 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
938 | set_bit(Faulty, &rdev->flags); | |
939 | else if (desc->state & (1<<MD_DISK_SYNC) /* && | |
940 | desc->raid_disk < mddev->raid_disks */) { | |
941 | set_bit(In_sync, &rdev->flags); | |
942 | rdev->raid_disk = desc->raid_disk; | |
943 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { | |
944 | /* active but not in sync implies recovery up to | |
945 | * reshape position. We don't know exactly where | |
946 | * that is, so set to zero for now */ | |
947 | if (mddev->minor_version >= 91) { | |
948 | rdev->recovery_offset = 0; | |
949 | rdev->raid_disk = desc->raid_disk; | |
950 | } | |
951 | } | |
952 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) | |
953 | set_bit(WriteMostly, &rdev->flags); | |
954 | } else /* MULTIPATH are always insync */ | |
955 | set_bit(In_sync, &rdev->flags); | |
956 | return 0; | |
957 | } | |
958 | ||
959 | /* | |
960 | * sync_super for 0.90.0 | |
961 | */ | |
962 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
963 | { | |
964 | mdp_super_t *sb; | |
965 | mdk_rdev_t *rdev2; | |
966 | int next_spare = mddev->raid_disks; | |
967 | ||
968 | ||
969 | /* make rdev->sb match mddev data.. | |
970 | * | |
971 | * 1/ zero out disks | |
972 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
973 | * 3/ any empty disks < next_spare become removed | |
974 | * | |
975 | * disks[0] gets initialised to REMOVED because | |
976 | * we cannot be sure from other fields if it has | |
977 | * been initialised or not. | |
978 | */ | |
979 | int i; | |
980 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
981 | ||
982 | rdev->sb_size = MD_SB_BYTES; | |
983 | ||
984 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
985 | ||
986 | memset(sb, 0, sizeof(*sb)); | |
987 | ||
988 | sb->md_magic = MD_SB_MAGIC; | |
989 | sb->major_version = mddev->major_version; | |
990 | sb->patch_version = mddev->patch_version; | |
991 | sb->gvalid_words = 0; /* ignored */ | |
992 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
993 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
994 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
995 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
996 | ||
997 | sb->ctime = mddev->ctime; | |
998 | sb->level = mddev->level; | |
999 | sb->size = mddev->dev_sectors / 2; | |
1000 | sb->raid_disks = mddev->raid_disks; | |
1001 | sb->md_minor = mddev->md_minor; | |
1002 | sb->not_persistent = 0; | |
1003 | sb->utime = mddev->utime; | |
1004 | sb->state = 0; | |
1005 | sb->events_hi = (mddev->events>>32); | |
1006 | sb->events_lo = (u32)mddev->events; | |
1007 | ||
1008 | if (mddev->reshape_position == MaxSector) | |
1009 | sb->minor_version = 90; | |
1010 | else { | |
1011 | sb->minor_version = 91; | |
1012 | sb->reshape_position = mddev->reshape_position; | |
1013 | sb->new_level = mddev->new_level; | |
1014 | sb->delta_disks = mddev->delta_disks; | |
1015 | sb->new_layout = mddev->new_layout; | |
1016 | sb->new_chunk = mddev->new_chunk_sectors << 9; | |
1017 | } | |
1018 | mddev->minor_version = sb->minor_version; | |
1019 | if (mddev->in_sync) | |
1020 | { | |
1021 | sb->recovery_cp = mddev->recovery_cp; | |
1022 | sb->cp_events_hi = (mddev->events>>32); | |
1023 | sb->cp_events_lo = (u32)mddev->events; | |
1024 | if (mddev->recovery_cp == MaxSector) | |
1025 | sb->state = (1<< MD_SB_CLEAN); | |
1026 | } else | |
1027 | sb->recovery_cp = 0; | |
1028 | ||
1029 | sb->layout = mddev->layout; | |
1030 | sb->chunk_size = mddev->chunk_sectors << 9; | |
1031 | ||
1032 | if (mddev->bitmap && mddev->bitmap_file == NULL) | |
1033 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
1034 | ||
1035 | sb->disks[0].state = (1<<MD_DISK_REMOVED); | |
1036 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
1037 | mdp_disk_t *d; | |
1038 | int desc_nr; | |
1039 | int is_active = test_bit(In_sync, &rdev2->flags); | |
1040 | ||
1041 | if (rdev2->raid_disk >= 0 && | |
1042 | sb->minor_version >= 91) | |
1043 | /* we have nowhere to store the recovery_offset, | |
1044 | * but if it is not below the reshape_position, | |
1045 | * we can piggy-back on that. | |
1046 | */ | |
1047 | is_active = 1; | |
1048 | if (rdev2->raid_disk < 0 || | |
1049 | test_bit(Faulty, &rdev2->flags)) | |
1050 | is_active = 0; | |
1051 | if (is_active) | |
1052 | desc_nr = rdev2->raid_disk; | |
1053 | else | |
1054 | desc_nr = next_spare++; | |
1055 | rdev2->desc_nr = desc_nr; | |
1056 | d = &sb->disks[rdev2->desc_nr]; | |
1057 | nr_disks++; | |
1058 | d->number = rdev2->desc_nr; | |
1059 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1060 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
1061 | if (is_active) | |
1062 | d->raid_disk = rdev2->raid_disk; | |
1063 | else | |
1064 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1065 | if (test_bit(Faulty, &rdev2->flags)) | |
1066 | d->state = (1<<MD_DISK_FAULTY); | |
1067 | else if (is_active) { | |
1068 | d->state = (1<<MD_DISK_ACTIVE); | |
1069 | if (test_bit(In_sync, &rdev2->flags)) | |
1070 | d->state |= (1<<MD_DISK_SYNC); | |
1071 | active++; | |
1072 | working++; | |
1073 | } else { | |
1074 | d->state = 0; | |
1075 | spare++; | |
1076 | working++; | |
1077 | } | |
1078 | if (test_bit(WriteMostly, &rdev2->flags)) | |
1079 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1080 | } | |
1081 | /* now set the "removed" and "faulty" bits on any missing devices */ | |
1082 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1083 | mdp_disk_t *d = &sb->disks[i]; | |
1084 | if (d->state == 0 && d->number == 0) { | |
1085 | d->number = i; | |
1086 | d->raid_disk = i; | |
1087 | d->state = (1<<MD_DISK_REMOVED); | |
1088 | d->state |= (1<<MD_DISK_FAULTY); | |
1089 | failed++; | |
1090 | } | |
1091 | } | |
1092 | sb->nr_disks = nr_disks; | |
1093 | sb->active_disks = active; | |
1094 | sb->working_disks = working; | |
1095 | sb->failed_disks = failed; | |
1096 | sb->spare_disks = spare; | |
1097 | ||
1098 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1099 | sb->sb_csum = calc_sb_csum(sb); | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * rdev_size_change for 0.90.0 | |
1104 | */ | |
1105 | static unsigned long long | |
1106 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) | |
1107 | { | |
1108 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) | |
1109 | return 0; /* component must fit device */ | |
1110 | if (rdev->mddev->bitmap_offset) | |
1111 | return 0; /* can't move bitmap */ | |
1112 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); | |
1113 | if (!num_sectors || num_sectors > rdev->sb_start) | |
1114 | num_sectors = rdev->sb_start; | |
1115 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, | |
1116 | rdev->sb_page); | |
1117 | md_super_wait(rdev->mddev); | |
1118 | return num_sectors / 2; /* kB for sysfs */ | |
1119 | } | |
1120 | ||
1121 | ||
1122 | /* | |
1123 | * version 1 superblock | |
1124 | */ | |
1125 | ||
1126 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
1127 | { | |
1128 | __le32 disk_csum; | |
1129 | u32 csum; | |
1130 | unsigned long long newcsum; | |
1131 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1132 | __le32 *isuper = (__le32*)sb; | |
1133 | int i; | |
1134 | ||
1135 | disk_csum = sb->sb_csum; | |
1136 | sb->sb_csum = 0; | |
1137 | newcsum = 0; | |
1138 | for (i=0; size>=4; size -= 4 ) | |
1139 | newcsum += le32_to_cpu(*isuper++); | |
1140 | ||
1141 | if (size == 2) | |
1142 | newcsum += le16_to_cpu(*(__le16*) isuper); | |
1143 | ||
1144 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1145 | sb->sb_csum = disk_csum; | |
1146 | return cpu_to_le32(csum); | |
1147 | } | |
1148 | ||
1149 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1150 | { | |
1151 | struct mdp_superblock_1 *sb; | |
1152 | int ret; | |
1153 | sector_t sb_start; | |
1154 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1155 | int bmask; | |
1156 | ||
1157 | /* | |
1158 | * Calculate the position of the superblock in 512byte sectors. | |
1159 | * It is always aligned to a 4K boundary and | |
1160 | * depeding on minor_version, it can be: | |
1161 | * 0: At least 8K, but less than 12K, from end of device | |
1162 | * 1: At start of device | |
1163 | * 2: 4K from start of device. | |
1164 | */ | |
1165 | switch(minor_version) { | |
1166 | case 0: | |
1167 | sb_start = rdev->bdev->bd_inode->i_size >> 9; | |
1168 | sb_start -= 8*2; | |
1169 | sb_start &= ~(sector_t)(4*2-1); | |
1170 | break; | |
1171 | case 1: | |
1172 | sb_start = 0; | |
1173 | break; | |
1174 | case 2: | |
1175 | sb_start = 8; | |
1176 | break; | |
1177 | default: | |
1178 | return -EINVAL; | |
1179 | } | |
1180 | rdev->sb_start = sb_start; | |
1181 | ||
1182 | /* superblock is rarely larger than 1K, but it can be larger, | |
1183 | * and it is safe to read 4k, so we do that | |
1184 | */ | |
1185 | ret = read_disk_sb(rdev, 4096); | |
1186 | if (ret) return ret; | |
1187 | ||
1188 | ||
1189 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1190 | ||
1191 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1192 | sb->major_version != cpu_to_le32(1) || | |
1193 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
1194 | le64_to_cpu(sb->super_offset) != rdev->sb_start || | |
1195 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) | |
1196 | return -EINVAL; | |
1197 | ||
1198 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1199 | printk("md: invalid superblock checksum on %s\n", | |
1200 | bdevname(rdev->bdev,b)); | |
1201 | return -EINVAL; | |
1202 | } | |
1203 | if (le64_to_cpu(sb->data_size) < 10) { | |
1204 | printk("md: data_size too small on %s\n", | |
1205 | bdevname(rdev->bdev,b)); | |
1206 | return -EINVAL; | |
1207 | } | |
1208 | ||
1209 | rdev->preferred_minor = 0xffff; | |
1210 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
1211 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); | |
1212 | ||
1213 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; | |
1214 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1215 | if (rdev->sb_size & bmask) | |
1216 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
1217 | ||
1218 | if (minor_version | |
1219 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) | |
1220 | return -EINVAL; | |
1221 | ||
1222 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) | |
1223 | rdev->desc_nr = -1; | |
1224 | else | |
1225 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1226 | ||
1227 | if (!refdev) { | |
1228 | ret = 1; | |
1229 | } else { | |
1230 | __u64 ev1, ev2; | |
1231 | struct mdp_superblock_1 *refsb = | |
1232 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1233 | ||
1234 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1235 | sb->level != refsb->level || | |
1236 | sb->layout != refsb->layout || | |
1237 | sb->chunksize != refsb->chunksize) { | |
1238 | printk(KERN_WARNING "md: %s has strangely different" | |
1239 | " superblock to %s\n", | |
1240 | bdevname(rdev->bdev,b), | |
1241 | bdevname(refdev->bdev,b2)); | |
1242 | return -EINVAL; | |
1243 | } | |
1244 | ev1 = le64_to_cpu(sb->events); | |
1245 | ev2 = le64_to_cpu(refsb->events); | |
1246 | ||
1247 | if (ev1 > ev2) | |
1248 | ret = 1; | |
1249 | else | |
1250 | ret = 0; | |
1251 | } | |
1252 | if (minor_version) | |
1253 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
1254 | le64_to_cpu(sb->data_offset); | |
1255 | else | |
1256 | rdev->sectors = rdev->sb_start; | |
1257 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1258 | return -EINVAL; | |
1259 | rdev->sectors = le64_to_cpu(sb->data_size); | |
1260 | if (le64_to_cpu(sb->size) > rdev->sectors) | |
1261 | return -EINVAL; | |
1262 | return ret; | |
1263 | } | |
1264 | ||
1265 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1266 | { | |
1267 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1268 | __u64 ev1 = le64_to_cpu(sb->events); | |
1269 | ||
1270 | rdev->raid_disk = -1; | |
1271 | clear_bit(Faulty, &rdev->flags); | |
1272 | clear_bit(In_sync, &rdev->flags); | |
1273 | clear_bit(WriteMostly, &rdev->flags); | |
1274 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1275 | ||
1276 | if (mddev->raid_disks == 0) { | |
1277 | mddev->major_version = 1; | |
1278 | mddev->patch_version = 0; | |
1279 | mddev->external = 0; | |
1280 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); | |
1281 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1282 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1283 | mddev->level = le32_to_cpu(sb->level); | |
1284 | mddev->clevel[0] = 0; | |
1285 | mddev->layout = le32_to_cpu(sb->layout); | |
1286 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1287 | mddev->dev_sectors = le64_to_cpu(sb->size); | |
1288 | mddev->events = ev1; | |
1289 | mddev->bitmap_offset = 0; | |
1290 | mddev->default_bitmap_offset = 1024 >> 9; | |
1291 | ||
1292 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1293 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1294 | ||
1295 | mddev->max_disks = (4096-256)/2; | |
1296 | ||
1297 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && | |
1298 | mddev->bitmap_file == NULL ) | |
1299 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); | |
1300 | ||
1301 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { | |
1302 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1303 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1304 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1305 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1306 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); | |
1307 | } else { | |
1308 | mddev->reshape_position = MaxSector; | |
1309 | mddev->delta_disks = 0; | |
1310 | mddev->new_level = mddev->level; | |
1311 | mddev->new_layout = mddev->layout; | |
1312 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
1313 | } | |
1314 | ||
1315 | } else if (mddev->pers == NULL) { | |
1316 | /* Insist of good event counter while assembling */ | |
1317 | ++ev1; | |
1318 | if (ev1 < mddev->events) | |
1319 | return -EINVAL; | |
1320 | } else if (mddev->bitmap) { | |
1321 | /* If adding to array with a bitmap, then we can accept an | |
1322 | * older device, but not too old. | |
1323 | */ | |
1324 | if (ev1 < mddev->bitmap->events_cleared) | |
1325 | return 0; | |
1326 | } else { | |
1327 | if (ev1 < mddev->events) | |
1328 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1329 | return 0; | |
1330 | } | |
1331 | if (mddev->level != LEVEL_MULTIPATH) { | |
1332 | int role; | |
1333 | if (rdev->desc_nr < 0 || | |
1334 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1335 | role = 0xffff; | |
1336 | rdev->desc_nr = -1; | |
1337 | } else | |
1338 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1339 | switch(role) { | |
1340 | case 0xffff: /* spare */ | |
1341 | break; | |
1342 | case 0xfffe: /* faulty */ | |
1343 | set_bit(Faulty, &rdev->flags); | |
1344 | break; | |
1345 | default: | |
1346 | if ((le32_to_cpu(sb->feature_map) & | |
1347 | MD_FEATURE_RECOVERY_OFFSET)) | |
1348 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1349 | else | |
1350 | set_bit(In_sync, &rdev->flags); | |
1351 | rdev->raid_disk = role; | |
1352 | break; | |
1353 | } | |
1354 | if (sb->devflags & WriteMostly1) | |
1355 | set_bit(WriteMostly, &rdev->flags); | |
1356 | } else /* MULTIPATH are always insync */ | |
1357 | set_bit(In_sync, &rdev->flags); | |
1358 | ||
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1363 | { | |
1364 | struct mdp_superblock_1 *sb; | |
1365 | mdk_rdev_t *rdev2; | |
1366 | int max_dev, i; | |
1367 | /* make rdev->sb match mddev and rdev data. */ | |
1368 | ||
1369 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1370 | ||
1371 | sb->feature_map = 0; | |
1372 | sb->pad0 = 0; | |
1373 | sb->recovery_offset = cpu_to_le64(0); | |
1374 | memset(sb->pad1, 0, sizeof(sb->pad1)); | |
1375 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1376 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1377 | ||
1378 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1379 | sb->events = cpu_to_le64(mddev->events); | |
1380 | if (mddev->in_sync) | |
1381 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1382 | else | |
1383 | sb->resync_offset = cpu_to_le64(0); | |
1384 | ||
1385 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); | |
1386 | ||
1387 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); | |
1388 | sb->size = cpu_to_le64(mddev->dev_sectors); | |
1389 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); | |
1390 | sb->level = cpu_to_le32(mddev->level); | |
1391 | sb->layout = cpu_to_le32(mddev->layout); | |
1392 | ||
1393 | if (mddev->bitmap && mddev->bitmap_file == NULL) { | |
1394 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
1395 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); | |
1396 | } | |
1397 | ||
1398 | if (rdev->raid_disk >= 0 && | |
1399 | !test_bit(In_sync, &rdev->flags)) { | |
1400 | if (rdev->recovery_offset > 0) { | |
1401 | sb->feature_map |= | |
1402 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1403 | sb->recovery_offset = | |
1404 | cpu_to_le64(rdev->recovery_offset); | |
1405 | } | |
1406 | } | |
1407 | ||
1408 | if (mddev->reshape_position != MaxSector) { | |
1409 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1410 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1411 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1412 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1413 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1414 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); | |
1415 | } | |
1416 | ||
1417 | max_dev = 0; | |
1418 | list_for_each_entry(rdev2, &mddev->disks, same_set) | |
1419 | if (rdev2->desc_nr+1 > max_dev) | |
1420 | max_dev = rdev2->desc_nr+1; | |
1421 | ||
1422 | if (max_dev > le32_to_cpu(sb->max_dev)) { | |
1423 | int bmask; | |
1424 | sb->max_dev = cpu_to_le32(max_dev); | |
1425 | rdev->sb_size = max_dev * 2 + 256; | |
1426 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1427 | if (rdev->sb_size & bmask) | |
1428 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
1429 | } | |
1430 | for (i=0; i<max_dev;i++) | |
1431 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1432 | ||
1433 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
1434 | i = rdev2->desc_nr; | |
1435 | if (test_bit(Faulty, &rdev2->flags)) | |
1436 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1437 | else if (test_bit(In_sync, &rdev2->flags)) | |
1438 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1439 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) | |
1440 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1441 | else | |
1442 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1443 | } | |
1444 | ||
1445 | sb->sb_csum = calc_sb_1_csum(sb); | |
1446 | } | |
1447 | ||
1448 | static unsigned long long | |
1449 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) | |
1450 | { | |
1451 | struct mdp_superblock_1 *sb; | |
1452 | sector_t max_sectors; | |
1453 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) | |
1454 | return 0; /* component must fit device */ | |
1455 | if (rdev->sb_start < rdev->data_offset) { | |
1456 | /* minor versions 1 and 2; superblock before data */ | |
1457 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; | |
1458 | max_sectors -= rdev->data_offset; | |
1459 | if (!num_sectors || num_sectors > max_sectors) | |
1460 | num_sectors = max_sectors; | |
1461 | } else if (rdev->mddev->bitmap_offset) { | |
1462 | /* minor version 0 with bitmap we can't move */ | |
1463 | return 0; | |
1464 | } else { | |
1465 | /* minor version 0; superblock after data */ | |
1466 | sector_t sb_start; | |
1467 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1468 | sb_start &= ~(sector_t)(4*2 - 1); | |
1469 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; | |
1470 | if (!num_sectors || num_sectors > max_sectors) | |
1471 | num_sectors = max_sectors; | |
1472 | rdev->sb_start = sb_start; | |
1473 | } | |
1474 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
1475 | sb->data_size = cpu_to_le64(num_sectors); | |
1476 | sb->super_offset = rdev->sb_start; | |
1477 | sb->sb_csum = calc_sb_1_csum(sb); | |
1478 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, | |
1479 | rdev->sb_page); | |
1480 | md_super_wait(rdev->mddev); | |
1481 | return num_sectors / 2; /* kB for sysfs */ | |
1482 | } | |
1483 | ||
1484 | static struct super_type super_types[] = { | |
1485 | [0] = { | |
1486 | .name = "0.90.0", | |
1487 | .owner = THIS_MODULE, | |
1488 | .load_super = super_90_load, | |
1489 | .validate_super = super_90_validate, | |
1490 | .sync_super = super_90_sync, | |
1491 | .rdev_size_change = super_90_rdev_size_change, | |
1492 | }, | |
1493 | [1] = { | |
1494 | .name = "md-1", | |
1495 | .owner = THIS_MODULE, | |
1496 | .load_super = super_1_load, | |
1497 | .validate_super = super_1_validate, | |
1498 | .sync_super = super_1_sync, | |
1499 | .rdev_size_change = super_1_rdev_size_change, | |
1500 | }, | |
1501 | }; | |
1502 | ||
1503 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1504 | { | |
1505 | mdk_rdev_t *rdev, *rdev2; | |
1506 | ||
1507 | rcu_read_lock(); | |
1508 | rdev_for_each_rcu(rdev, mddev1) | |
1509 | rdev_for_each_rcu(rdev2, mddev2) | |
1510 | if (rdev->bdev->bd_contains == | |
1511 | rdev2->bdev->bd_contains) { | |
1512 | rcu_read_unlock(); | |
1513 | return 1; | |
1514 | } | |
1515 | rcu_read_unlock(); | |
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | static LIST_HEAD(pending_raid_disks); | |
1520 | ||
1521 | /* | |
1522 | * Try to register data integrity profile for an mddev | |
1523 | * | |
1524 | * This is called when an array is started and after a disk has been kicked | |
1525 | * from the array. It only succeeds if all working and active component devices | |
1526 | * are integrity capable with matching profiles. | |
1527 | */ | |
1528 | int md_integrity_register(mddev_t *mddev) | |
1529 | { | |
1530 | mdk_rdev_t *rdev, *reference = NULL; | |
1531 | ||
1532 | if (list_empty(&mddev->disks)) | |
1533 | return 0; /* nothing to do */ | |
1534 | if (blk_get_integrity(mddev->gendisk)) | |
1535 | return 0; /* already registered */ | |
1536 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1537 | /* skip spares and non-functional disks */ | |
1538 | if (test_bit(Faulty, &rdev->flags)) | |
1539 | continue; | |
1540 | if (rdev->raid_disk < 0) | |
1541 | continue; | |
1542 | /* | |
1543 | * If at least one rdev is not integrity capable, we can not | |
1544 | * enable data integrity for the md device. | |
1545 | */ | |
1546 | if (!bdev_get_integrity(rdev->bdev)) | |
1547 | return -EINVAL; | |
1548 | if (!reference) { | |
1549 | /* Use the first rdev as the reference */ | |
1550 | reference = rdev; | |
1551 | continue; | |
1552 | } | |
1553 | /* does this rdev's profile match the reference profile? */ | |
1554 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1555 | rdev->bdev->bd_disk) < 0) | |
1556 | return -EINVAL; | |
1557 | } | |
1558 | /* | |
1559 | * All component devices are integrity capable and have matching | |
1560 | * profiles, register the common profile for the md device. | |
1561 | */ | |
1562 | if (blk_integrity_register(mddev->gendisk, | |
1563 | bdev_get_integrity(reference->bdev)) != 0) { | |
1564 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1565 | mdname(mddev)); | |
1566 | return -EINVAL; | |
1567 | } | |
1568 | printk(KERN_NOTICE "md: data integrity on %s enabled\n", | |
1569 | mdname(mddev)); | |
1570 | return 0; | |
1571 | } | |
1572 | EXPORT_SYMBOL(md_integrity_register); | |
1573 | ||
1574 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1575 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
1576 | { | |
1577 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); | |
1578 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); | |
1579 | ||
1580 | if (!bi_mddev) /* nothing to do */ | |
1581 | return; | |
1582 | if (rdev->raid_disk < 0) /* skip spares */ | |
1583 | return; | |
1584 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, | |
1585 | rdev->bdev->bd_disk) >= 0) | |
1586 | return; | |
1587 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1588 | blk_integrity_unregister(mddev->gendisk); | |
1589 | } | |
1590 | EXPORT_SYMBOL(md_integrity_add_rdev); | |
1591 | ||
1592 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1593 | { | |
1594 | char b[BDEVNAME_SIZE]; | |
1595 | struct kobject *ko; | |
1596 | char *s; | |
1597 | int err; | |
1598 | ||
1599 | if (rdev->mddev) { | |
1600 | MD_BUG(); | |
1601 | return -EINVAL; | |
1602 | } | |
1603 | ||
1604 | /* prevent duplicates */ | |
1605 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1606 | return -EEXIST; | |
1607 | ||
1608 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ | |
1609 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1610 | rdev->sectors < mddev->dev_sectors)) { | |
1611 | if (mddev->pers) { | |
1612 | /* Cannot change size, so fail | |
1613 | * If mddev->level <= 0, then we don't care | |
1614 | * about aligning sizes (e.g. linear) | |
1615 | */ | |
1616 | if (mddev->level > 0) | |
1617 | return -ENOSPC; | |
1618 | } else | |
1619 | mddev->dev_sectors = rdev->sectors; | |
1620 | } | |
1621 | ||
1622 | /* Verify rdev->desc_nr is unique. | |
1623 | * If it is -1, assign a free number, else | |
1624 | * check number is not in use | |
1625 | */ | |
1626 | if (rdev->desc_nr < 0) { | |
1627 | int choice = 0; | |
1628 | if (mddev->pers) choice = mddev->raid_disks; | |
1629 | while (find_rdev_nr(mddev, choice)) | |
1630 | choice++; | |
1631 | rdev->desc_nr = choice; | |
1632 | } else { | |
1633 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1634 | return -EBUSY; | |
1635 | } | |
1636 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { | |
1637 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1638 | mdname(mddev), mddev->max_disks); | |
1639 | return -EBUSY; | |
1640 | } | |
1641 | bdevname(rdev->bdev,b); | |
1642 | while ( (s=strchr(b, '/')) != NULL) | |
1643 | *s = '!'; | |
1644 | ||
1645 | rdev->mddev = mddev; | |
1646 | printk(KERN_INFO "md: bind<%s>\n", b); | |
1647 | ||
1648 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) | |
1649 | goto fail; | |
1650 | ||
1651 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; | |
1652 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { | |
1653 | kobject_del(&rdev->kobj); | |
1654 | goto fail; | |
1655 | } | |
1656 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); | |
1657 | ||
1658 | list_add_rcu(&rdev->same_set, &mddev->disks); | |
1659 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); | |
1660 | ||
1661 | /* May as well allow recovery to be retried once */ | |
1662 | mddev->recovery_disabled = 0; | |
1663 | ||
1664 | return 0; | |
1665 | ||
1666 | fail: | |
1667 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1668 | b, mdname(mddev)); | |
1669 | return err; | |
1670 | } | |
1671 | ||
1672 | static void md_delayed_delete(struct work_struct *ws) | |
1673 | { | |
1674 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1675 | kobject_del(&rdev->kobj); | |
1676 | kobject_put(&rdev->kobj); | |
1677 | } | |
1678 | ||
1679 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) | |
1680 | { | |
1681 | char b[BDEVNAME_SIZE]; | |
1682 | if (!rdev->mddev) { | |
1683 | MD_BUG(); | |
1684 | return; | |
1685 | } | |
1686 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); | |
1687 | list_del_rcu(&rdev->same_set); | |
1688 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1689 | rdev->mddev = NULL; | |
1690 | sysfs_remove_link(&rdev->kobj, "block"); | |
1691 | sysfs_put(rdev->sysfs_state); | |
1692 | rdev->sysfs_state = NULL; | |
1693 | /* We need to delay this, otherwise we can deadlock when | |
1694 | * writing to 'remove' to "dev/state". We also need | |
1695 | * to delay it due to rcu usage. | |
1696 | */ | |
1697 | synchronize_rcu(); | |
1698 | INIT_WORK(&rdev->del_work, md_delayed_delete); | |
1699 | kobject_get(&rdev->kobj); | |
1700 | schedule_work(&rdev->del_work); | |
1701 | } | |
1702 | ||
1703 | /* | |
1704 | * prevent the device from being mounted, repartitioned or | |
1705 | * otherwise reused by a RAID array (or any other kernel | |
1706 | * subsystem), by bd_claiming the device. | |
1707 | */ | |
1708 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) | |
1709 | { | |
1710 | int err = 0; | |
1711 | struct block_device *bdev; | |
1712 | char b[BDEVNAME_SIZE]; | |
1713 | ||
1714 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
1715 | if (IS_ERR(bdev)) { | |
1716 | printk(KERN_ERR "md: could not open %s.\n", | |
1717 | __bdevname(dev, b)); | |
1718 | return PTR_ERR(bdev); | |
1719 | } | |
1720 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); | |
1721 | if (err) { | |
1722 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1723 | bdevname(bdev, b)); | |
1724 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); | |
1725 | return err; | |
1726 | } | |
1727 | if (!shared) | |
1728 | set_bit(AllReserved, &rdev->flags); | |
1729 | rdev->bdev = bdev; | |
1730 | return err; | |
1731 | } | |
1732 | ||
1733 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1734 | { | |
1735 | struct block_device *bdev = rdev->bdev; | |
1736 | rdev->bdev = NULL; | |
1737 | if (!bdev) | |
1738 | MD_BUG(); | |
1739 | bd_release(bdev); | |
1740 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); | |
1741 | } | |
1742 | ||
1743 | void md_autodetect_dev(dev_t dev); | |
1744 | ||
1745 | static void export_rdev(mdk_rdev_t * rdev) | |
1746 | { | |
1747 | char b[BDEVNAME_SIZE]; | |
1748 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1749 | bdevname(rdev->bdev,b)); | |
1750 | if (rdev->mddev) | |
1751 | MD_BUG(); | |
1752 | free_disk_sb(rdev); | |
1753 | #ifndef MODULE | |
1754 | if (test_bit(AutoDetected, &rdev->flags)) | |
1755 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1756 | #endif | |
1757 | unlock_rdev(rdev); | |
1758 | kobject_put(&rdev->kobj); | |
1759 | } | |
1760 | ||
1761 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1762 | { | |
1763 | unbind_rdev_from_array(rdev); | |
1764 | export_rdev(rdev); | |
1765 | } | |
1766 | ||
1767 | static void export_array(mddev_t *mddev) | |
1768 | { | |
1769 | mdk_rdev_t *rdev, *tmp; | |
1770 | ||
1771 | rdev_for_each(rdev, tmp, mddev) { | |
1772 | if (!rdev->mddev) { | |
1773 | MD_BUG(); | |
1774 | continue; | |
1775 | } | |
1776 | kick_rdev_from_array(rdev); | |
1777 | } | |
1778 | if (!list_empty(&mddev->disks)) | |
1779 | MD_BUG(); | |
1780 | mddev->raid_disks = 0; | |
1781 | mddev->major_version = 0; | |
1782 | } | |
1783 | ||
1784 | static void print_desc(mdp_disk_t *desc) | |
1785 | { | |
1786 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1787 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1788 | } | |
1789 | ||
1790 | static void print_sb_90(mdp_super_t *sb) | |
1791 | { | |
1792 | int i; | |
1793 | ||
1794 | printk(KERN_INFO | |
1795 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1796 | sb->major_version, sb->minor_version, sb->patch_version, | |
1797 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1798 | sb->ctime); | |
1799 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1800 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1801 | sb->md_minor, sb->layout, sb->chunk_size); | |
1802 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1803 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1804 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1805 | sb->failed_disks, sb->spare_disks, | |
1806 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1807 | ||
1808 | printk(KERN_INFO); | |
1809 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1810 | mdp_disk_t *desc; | |
1811 | ||
1812 | desc = sb->disks + i; | |
1813 | if (desc->number || desc->major || desc->minor || | |
1814 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1815 | printk(" D %2d: ", i); | |
1816 | print_desc(desc); | |
1817 | } | |
1818 | } | |
1819 | printk(KERN_INFO "md: THIS: "); | |
1820 | print_desc(&sb->this_disk); | |
1821 | } | |
1822 | ||
1823 | static void print_sb_1(struct mdp_superblock_1 *sb) | |
1824 | { | |
1825 | __u8 *uuid; | |
1826 | ||
1827 | uuid = sb->set_uuid; | |
1828 | printk(KERN_INFO | |
1829 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1830 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1831 | "md: Name: \"%s\" CT:%llu\n", | |
1832 | le32_to_cpu(sb->major_version), | |
1833 | le32_to_cpu(sb->feature_map), | |
1834 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1835 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1836 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1837 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1838 | sb->set_name, | |
1839 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1840 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1841 | ||
1842 | uuid = sb->device_uuid; | |
1843 | printk(KERN_INFO | |
1844 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
1845 | " RO:%llu\n" | |
1846 | "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" | |
1847 | ":%02x%02x%02x%02x%02x%02x\n" | |
1848 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1849 | "md: (MaxDev:%u) \n", | |
1850 | le32_to_cpu(sb->level), | |
1851 | (unsigned long long)le64_to_cpu(sb->size), | |
1852 | le32_to_cpu(sb->raid_disks), | |
1853 | le32_to_cpu(sb->layout), | |
1854 | le32_to_cpu(sb->chunksize), | |
1855 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1856 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1857 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1858 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1859 | le32_to_cpu(sb->dev_number), | |
1860 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1861 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1862 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1863 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1864 | sb->devflags, | |
1865 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1866 | (unsigned long long)le64_to_cpu(sb->events), | |
1867 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1868 | le32_to_cpu(sb->sb_csum), | |
1869 | le32_to_cpu(sb->max_dev) | |
1870 | ); | |
1871 | } | |
1872 | ||
1873 | static void print_rdev(mdk_rdev_t *rdev, int major_version) | |
1874 | { | |
1875 | char b[BDEVNAME_SIZE]; | |
1876 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", | |
1877 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
1878 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), | |
1879 | rdev->desc_nr); | |
1880 | if (rdev->sb_loaded) { | |
1881 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); | |
1882 | switch (major_version) { | |
1883 | case 0: | |
1884 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1885 | break; | |
1886 | case 1: | |
1887 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1888 | break; | |
1889 | } | |
1890 | } else | |
1891 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1892 | } | |
1893 | ||
1894 | static void md_print_devices(void) | |
1895 | { | |
1896 | struct list_head *tmp; | |
1897 | mdk_rdev_t *rdev; | |
1898 | mddev_t *mddev; | |
1899 | char b[BDEVNAME_SIZE]; | |
1900 | ||
1901 | printk("\n"); | |
1902 | printk("md: **********************************\n"); | |
1903 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1904 | printk("md: **********************************\n"); | |
1905 | for_each_mddev(mddev, tmp) { | |
1906 | ||
1907 | if (mddev->bitmap) | |
1908 | bitmap_print_sb(mddev->bitmap); | |
1909 | else | |
1910 | printk("%s: ", mdname(mddev)); | |
1911 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
1912 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1913 | printk("\n"); | |
1914 | ||
1915 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
1916 | print_rdev(rdev, mddev->major_version); | |
1917 | } | |
1918 | printk("md: **********************************\n"); | |
1919 | printk("\n"); | |
1920 | } | |
1921 | ||
1922 | ||
1923 | static void sync_sbs(mddev_t * mddev, int nospares) | |
1924 | { | |
1925 | /* Update each superblock (in-memory image), but | |
1926 | * if we are allowed to, skip spares which already | |
1927 | * have the right event counter, or have one earlier | |
1928 | * (which would mean they aren't being marked as dirty | |
1929 | * with the rest of the array) | |
1930 | */ | |
1931 | mdk_rdev_t *rdev; | |
1932 | ||
1933 | /* First make sure individual recovery_offsets are correct */ | |
1934 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1935 | if (rdev->raid_disk >= 0 && | |
1936 | !test_bit(In_sync, &rdev->flags) && | |
1937 | mddev->curr_resync_completed > rdev->recovery_offset) | |
1938 | rdev->recovery_offset = mddev->curr_resync_completed; | |
1939 | ||
1940 | } | |
1941 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1942 | if (rdev->sb_events == mddev->events || | |
1943 | (nospares && | |
1944 | rdev->raid_disk < 0 && | |
1945 | (rdev->sb_events&1)==0 && | |
1946 | rdev->sb_events+1 == mddev->events)) { | |
1947 | /* Don't update this superblock */ | |
1948 | rdev->sb_loaded = 2; | |
1949 | } else { | |
1950 | super_types[mddev->major_version]. | |
1951 | sync_super(mddev, rdev); | |
1952 | rdev->sb_loaded = 1; | |
1953 | } | |
1954 | } | |
1955 | } | |
1956 | ||
1957 | static void md_update_sb(mddev_t * mddev, int force_change) | |
1958 | { | |
1959 | mdk_rdev_t *rdev; | |
1960 | int sync_req; | |
1961 | int nospares = 0; | |
1962 | ||
1963 | mddev->utime = get_seconds(); | |
1964 | if (mddev->external) | |
1965 | return; | |
1966 | repeat: | |
1967 | spin_lock_irq(&mddev->write_lock); | |
1968 | ||
1969 | set_bit(MD_CHANGE_PENDING, &mddev->flags); | |
1970 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
1971 | force_change = 1; | |
1972 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
1973 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
1974 | * though if events isn't the right even/odd, we will have to do | |
1975 | * spares after all | |
1976 | */ | |
1977 | nospares = 1; | |
1978 | if (force_change) | |
1979 | nospares = 0; | |
1980 | if (mddev->degraded) | |
1981 | /* If the array is degraded, then skipping spares is both | |
1982 | * dangerous and fairly pointless. | |
1983 | * Dangerous because a device that was removed from the array | |
1984 | * might have a event_count that still looks up-to-date, | |
1985 | * so it can be re-added without a resync. | |
1986 | * Pointless because if there are any spares to skip, | |
1987 | * then a recovery will happen and soon that array won't | |
1988 | * be degraded any more and the spare can go back to sleep then. | |
1989 | */ | |
1990 | nospares = 0; | |
1991 | ||
1992 | sync_req = mddev->in_sync; | |
1993 | ||
1994 | /* If this is just a dirty<->clean transition, and the array is clean | |
1995 | * and 'events' is odd, we can roll back to the previous clean state */ | |
1996 | if (nospares | |
1997 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1998 | && (mddev->events & 1) | |
1999 | && mddev->events != 1) | |
2000 | mddev->events--; | |
2001 | else { | |
2002 | /* otherwise we have to go forward and ... */ | |
2003 | mddev->events ++; | |
2004 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
2005 | /* .. if the array isn't clean, an 'even' event must also go | |
2006 | * to spares. */ | |
2007 | if ((mddev->events&1)==0) | |
2008 | nospares = 0; | |
2009 | } else { | |
2010 | /* otherwise an 'odd' event must go to spares */ | |
2011 | if ((mddev->events&1)) | |
2012 | nospares = 0; | |
2013 | } | |
2014 | } | |
2015 | ||
2016 | if (!mddev->events) { | |
2017 | /* | |
2018 | * oops, this 64-bit counter should never wrap. | |
2019 | * Either we are in around ~1 trillion A.C., assuming | |
2020 | * 1 reboot per second, or we have a bug: | |
2021 | */ | |
2022 | MD_BUG(); | |
2023 | mddev->events --; | |
2024 | } | |
2025 | ||
2026 | /* | |
2027 | * do not write anything to disk if using | |
2028 | * nonpersistent superblocks | |
2029 | */ | |
2030 | if (!mddev->persistent) { | |
2031 | if (!mddev->external) | |
2032 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
2033 | ||
2034 | spin_unlock_irq(&mddev->write_lock); | |
2035 | wake_up(&mddev->sb_wait); | |
2036 | return; | |
2037 | } | |
2038 | sync_sbs(mddev, nospares); | |
2039 | spin_unlock_irq(&mddev->write_lock); | |
2040 | ||
2041 | dprintk(KERN_INFO | |
2042 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2043 | mdname(mddev),mddev->in_sync); | |
2044 | ||
2045 | bitmap_update_sb(mddev->bitmap); | |
2046 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2047 | char b[BDEVNAME_SIZE]; | |
2048 | dprintk(KERN_INFO "md: "); | |
2049 | if (rdev->sb_loaded != 1) | |
2050 | continue; /* no noise on spare devices */ | |
2051 | if (test_bit(Faulty, &rdev->flags)) | |
2052 | dprintk("(skipping faulty "); | |
2053 | ||
2054 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
2055 | if (!test_bit(Faulty, &rdev->flags)) { | |
2056 | md_super_write(mddev,rdev, | |
2057 | rdev->sb_start, rdev->sb_size, | |
2058 | rdev->sb_page); | |
2059 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2060 | bdevname(rdev->bdev,b), | |
2061 | (unsigned long long)rdev->sb_start); | |
2062 | rdev->sb_events = mddev->events; | |
2063 | ||
2064 | } else | |
2065 | dprintk(")\n"); | |
2066 | if (mddev->level == LEVEL_MULTIPATH) | |
2067 | /* only need to write one superblock... */ | |
2068 | break; | |
2069 | } | |
2070 | md_super_wait(mddev); | |
2071 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ | |
2072 | ||
2073 | spin_lock_irq(&mddev->write_lock); | |
2074 | if (mddev->in_sync != sync_req || | |
2075 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
2076 | /* have to write it out again */ | |
2077 | spin_unlock_irq(&mddev->write_lock); | |
2078 | goto repeat; | |
2079 | } | |
2080 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
2081 | spin_unlock_irq(&mddev->write_lock); | |
2082 | wake_up(&mddev->sb_wait); | |
2083 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
2084 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
2085 | ||
2086 | } | |
2087 | ||
2088 | /* words written to sysfs files may, or may not, be \n terminated. | |
2089 | * We want to accept with case. For this we use cmd_match. | |
2090 | */ | |
2091 | static int cmd_match(const char *cmd, const char *str) | |
2092 | { | |
2093 | /* See if cmd, written into a sysfs file, matches | |
2094 | * str. They must either be the same, or cmd can | |
2095 | * have a trailing newline | |
2096 | */ | |
2097 | while (*cmd && *str && *cmd == *str) { | |
2098 | cmd++; | |
2099 | str++; | |
2100 | } | |
2101 | if (*cmd == '\n') | |
2102 | cmd++; | |
2103 | if (*str || *cmd) | |
2104 | return 0; | |
2105 | return 1; | |
2106 | } | |
2107 | ||
2108 | struct rdev_sysfs_entry { | |
2109 | struct attribute attr; | |
2110 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2111 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2112 | }; | |
2113 | ||
2114 | static ssize_t | |
2115 | state_show(mdk_rdev_t *rdev, char *page) | |
2116 | { | |
2117 | char *sep = ""; | |
2118 | size_t len = 0; | |
2119 | ||
2120 | if (test_bit(Faulty, &rdev->flags)) { | |
2121 | len+= sprintf(page+len, "%sfaulty",sep); | |
2122 | sep = ","; | |
2123 | } | |
2124 | if (test_bit(In_sync, &rdev->flags)) { | |
2125 | len += sprintf(page+len, "%sin_sync",sep); | |
2126 | sep = ","; | |
2127 | } | |
2128 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2129 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2130 | sep = ","; | |
2131 | } | |
2132 | if (test_bit(Blocked, &rdev->flags)) { | |
2133 | len += sprintf(page+len, "%sblocked", sep); | |
2134 | sep = ","; | |
2135 | } | |
2136 | if (!test_bit(Faulty, &rdev->flags) && | |
2137 | !test_bit(In_sync, &rdev->flags)) { | |
2138 | len += sprintf(page+len, "%sspare", sep); | |
2139 | sep = ","; | |
2140 | } | |
2141 | return len+sprintf(page+len, "\n"); | |
2142 | } | |
2143 | ||
2144 | static ssize_t | |
2145 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2146 | { | |
2147 | /* can write | |
2148 | * faulty - simulates and error | |
2149 | * remove - disconnects the device | |
2150 | * writemostly - sets write_mostly | |
2151 | * -writemostly - clears write_mostly | |
2152 | * blocked - sets the Blocked flag | |
2153 | * -blocked - clears the Blocked flag | |
2154 | * insync - sets Insync providing device isn't active | |
2155 | */ | |
2156 | int err = -EINVAL; | |
2157 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2158 | md_error(rdev->mddev, rdev); | |
2159 | err = 0; | |
2160 | } else if (cmd_match(buf, "remove")) { | |
2161 | if (rdev->raid_disk >= 0) | |
2162 | err = -EBUSY; | |
2163 | else { | |
2164 | mddev_t *mddev = rdev->mddev; | |
2165 | kick_rdev_from_array(rdev); | |
2166 | if (mddev->pers) | |
2167 | md_update_sb(mddev, 1); | |
2168 | md_new_event(mddev); | |
2169 | err = 0; | |
2170 | } | |
2171 | } else if (cmd_match(buf, "writemostly")) { | |
2172 | set_bit(WriteMostly, &rdev->flags); | |
2173 | err = 0; | |
2174 | } else if (cmd_match(buf, "-writemostly")) { | |
2175 | clear_bit(WriteMostly, &rdev->flags); | |
2176 | err = 0; | |
2177 | } else if (cmd_match(buf, "blocked")) { | |
2178 | set_bit(Blocked, &rdev->flags); | |
2179 | err = 0; | |
2180 | } else if (cmd_match(buf, "-blocked")) { | |
2181 | clear_bit(Blocked, &rdev->flags); | |
2182 | wake_up(&rdev->blocked_wait); | |
2183 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2184 | md_wakeup_thread(rdev->mddev->thread); | |
2185 | ||
2186 | err = 0; | |
2187 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2188 | set_bit(In_sync, &rdev->flags); | |
2189 | err = 0; | |
2190 | } | |
2191 | if (!err && rdev->sysfs_state) | |
2192 | sysfs_notify_dirent(rdev->sysfs_state); | |
2193 | return err ? err : len; | |
2194 | } | |
2195 | static struct rdev_sysfs_entry rdev_state = | |
2196 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
2197 | ||
2198 | static ssize_t | |
2199 | errors_show(mdk_rdev_t *rdev, char *page) | |
2200 | { | |
2201 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2202 | } | |
2203 | ||
2204 | static ssize_t | |
2205 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2206 | { | |
2207 | char *e; | |
2208 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2209 | if (*buf && (*e == 0 || *e == '\n')) { | |
2210 | atomic_set(&rdev->corrected_errors, n); | |
2211 | return len; | |
2212 | } | |
2213 | return -EINVAL; | |
2214 | } | |
2215 | static struct rdev_sysfs_entry rdev_errors = | |
2216 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); | |
2217 | ||
2218 | static ssize_t | |
2219 | slot_show(mdk_rdev_t *rdev, char *page) | |
2220 | { | |
2221 | if (rdev->raid_disk < 0) | |
2222 | return sprintf(page, "none\n"); | |
2223 | else | |
2224 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2225 | } | |
2226 | ||
2227 | static ssize_t | |
2228 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2229 | { | |
2230 | char *e; | |
2231 | int err; | |
2232 | char nm[20]; | |
2233 | int slot = simple_strtoul(buf, &e, 10); | |
2234 | if (strncmp(buf, "none", 4)==0) | |
2235 | slot = -1; | |
2236 | else if (e==buf || (*e && *e!= '\n')) | |
2237 | return -EINVAL; | |
2238 | if (rdev->mddev->pers && slot == -1) { | |
2239 | /* Setting 'slot' on an active array requires also | |
2240 | * updating the 'rd%d' link, and communicating | |
2241 | * with the personality with ->hot_*_disk. | |
2242 | * For now we only support removing | |
2243 | * failed/spare devices. This normally happens automatically, | |
2244 | * but not when the metadata is externally managed. | |
2245 | */ | |
2246 | if (rdev->raid_disk == -1) | |
2247 | return -EEXIST; | |
2248 | /* personality does all needed checks */ | |
2249 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2250 | return -EINVAL; | |
2251 | err = rdev->mddev->pers-> | |
2252 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2253 | if (err) | |
2254 | return err; | |
2255 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2256 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2257 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2258 | md_wakeup_thread(rdev->mddev->thread); | |
2259 | } else if (rdev->mddev->pers) { | |
2260 | mdk_rdev_t *rdev2; | |
2261 | /* Activating a spare .. or possibly reactivating | |
2262 | * if we ever get bitmaps working here. | |
2263 | */ | |
2264 | ||
2265 | if (rdev->raid_disk != -1) | |
2266 | return -EBUSY; | |
2267 | ||
2268 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2269 | return -EINVAL; | |
2270 | ||
2271 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) | |
2272 | if (rdev2->raid_disk == slot) | |
2273 | return -EEXIST; | |
2274 | ||
2275 | rdev->raid_disk = slot; | |
2276 | if (test_bit(In_sync, &rdev->flags)) | |
2277 | rdev->saved_raid_disk = slot; | |
2278 | else | |
2279 | rdev->saved_raid_disk = -1; | |
2280 | err = rdev->mddev->pers-> | |
2281 | hot_add_disk(rdev->mddev, rdev); | |
2282 | if (err) { | |
2283 | rdev->raid_disk = -1; | |
2284 | return err; | |
2285 | } else | |
2286 | sysfs_notify_dirent(rdev->sysfs_state); | |
2287 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2288 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2289 | printk(KERN_WARNING | |
2290 | "md: cannot register " | |
2291 | "%s for %s\n", | |
2292 | nm, mdname(rdev->mddev)); | |
2293 | ||
2294 | /* don't wakeup anyone, leave that to userspace. */ | |
2295 | } else { | |
2296 | if (slot >= rdev->mddev->raid_disks) | |
2297 | return -ENOSPC; | |
2298 | rdev->raid_disk = slot; | |
2299 | /* assume it is working */ | |
2300 | clear_bit(Faulty, &rdev->flags); | |
2301 | clear_bit(WriteMostly, &rdev->flags); | |
2302 | set_bit(In_sync, &rdev->flags); | |
2303 | sysfs_notify_dirent(rdev->sysfs_state); | |
2304 | } | |
2305 | return len; | |
2306 | } | |
2307 | ||
2308 | ||
2309 | static struct rdev_sysfs_entry rdev_slot = | |
2310 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); | |
2311 | ||
2312 | static ssize_t | |
2313 | offset_show(mdk_rdev_t *rdev, char *page) | |
2314 | { | |
2315 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); | |
2316 | } | |
2317 | ||
2318 | static ssize_t | |
2319 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2320 | { | |
2321 | char *e; | |
2322 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2323 | if (e==buf || (*e && *e != '\n')) | |
2324 | return -EINVAL; | |
2325 | if (rdev->mddev->pers && rdev->raid_disk >= 0) | |
2326 | return -EBUSY; | |
2327 | if (rdev->sectors && rdev->mddev->external) | |
2328 | /* Must set offset before size, so overlap checks | |
2329 | * can be sane */ | |
2330 | return -EBUSY; | |
2331 | rdev->data_offset = offset; | |
2332 | return len; | |
2333 | } | |
2334 | ||
2335 | static struct rdev_sysfs_entry rdev_offset = | |
2336 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); | |
2337 | ||
2338 | static ssize_t | |
2339 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2340 | { | |
2341 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); | |
2342 | } | |
2343 | ||
2344 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) | |
2345 | { | |
2346 | /* check if two start/length pairs overlap */ | |
2347 | if (s1+l1 <= s2) | |
2348 | return 0; | |
2349 | if (s2+l2 <= s1) | |
2350 | return 0; | |
2351 | return 1; | |
2352 | } | |
2353 | ||
2354 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) | |
2355 | { | |
2356 | unsigned long long blocks; | |
2357 | sector_t new; | |
2358 | ||
2359 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2360 | return -EINVAL; | |
2361 | ||
2362 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2363 | return -EINVAL; /* sector conversion overflow */ | |
2364 | ||
2365 | new = blocks * 2; | |
2366 | if (new != blocks * 2) | |
2367 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2368 | ||
2369 | *sectors = new; | |
2370 | return 0; | |
2371 | } | |
2372 | ||
2373 | static ssize_t | |
2374 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2375 | { | |
2376 | mddev_t *my_mddev = rdev->mddev; | |
2377 | sector_t oldsectors = rdev->sectors; | |
2378 | sector_t sectors; | |
2379 | ||
2380 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
2381 | return -EINVAL; | |
2382 | if (my_mddev->pers && rdev->raid_disk >= 0) { | |
2383 | if (my_mddev->persistent) { | |
2384 | sectors = super_types[my_mddev->major_version]. | |
2385 | rdev_size_change(rdev, sectors); | |
2386 | if (!sectors) | |
2387 | return -EBUSY; | |
2388 | } else if (!sectors) | |
2389 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2390 | rdev->data_offset; | |
2391 | } | |
2392 | if (sectors < my_mddev->dev_sectors) | |
2393 | return -EINVAL; /* component must fit device */ | |
2394 | ||
2395 | rdev->sectors = sectors; | |
2396 | if (sectors > oldsectors && my_mddev->external) { | |
2397 | /* need to check that all other rdevs with the same ->bdev | |
2398 | * do not overlap. We need to unlock the mddev to avoid | |
2399 | * a deadlock. We have already changed rdev->sectors, and if | |
2400 | * we have to change it back, we will have the lock again. | |
2401 | */ | |
2402 | mddev_t *mddev; | |
2403 | int overlap = 0; | |
2404 | struct list_head *tmp; | |
2405 | ||
2406 | mddev_unlock(my_mddev); | |
2407 | for_each_mddev(mddev, tmp) { | |
2408 | mdk_rdev_t *rdev2; | |
2409 | ||
2410 | mddev_lock(mddev); | |
2411 | list_for_each_entry(rdev2, &mddev->disks, same_set) | |
2412 | if (test_bit(AllReserved, &rdev2->flags) || | |
2413 | (rdev->bdev == rdev2->bdev && | |
2414 | rdev != rdev2 && | |
2415 | overlaps(rdev->data_offset, rdev->sectors, | |
2416 | rdev2->data_offset, | |
2417 | rdev2->sectors))) { | |
2418 | overlap = 1; | |
2419 | break; | |
2420 | } | |
2421 | mddev_unlock(mddev); | |
2422 | if (overlap) { | |
2423 | mddev_put(mddev); | |
2424 | break; | |
2425 | } | |
2426 | } | |
2427 | mddev_lock(my_mddev); | |
2428 | if (overlap) { | |
2429 | /* Someone else could have slipped in a size | |
2430 | * change here, but doing so is just silly. | |
2431 | * We put oldsectors back because we *know* it is | |
2432 | * safe, and trust userspace not to race with | |
2433 | * itself | |
2434 | */ | |
2435 | rdev->sectors = oldsectors; | |
2436 | return -EBUSY; | |
2437 | } | |
2438 | } | |
2439 | return len; | |
2440 | } | |
2441 | ||
2442 | static struct rdev_sysfs_entry rdev_size = | |
2443 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); | |
2444 | ||
2445 | static struct attribute *rdev_default_attrs[] = { | |
2446 | &rdev_state.attr, | |
2447 | &rdev_errors.attr, | |
2448 | &rdev_slot.attr, | |
2449 | &rdev_offset.attr, | |
2450 | &rdev_size.attr, | |
2451 | NULL, | |
2452 | }; | |
2453 | static ssize_t | |
2454 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2455 | { | |
2456 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2457 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
2458 | mddev_t *mddev = rdev->mddev; | |
2459 | ssize_t rv; | |
2460 | ||
2461 | if (!entry->show) | |
2462 | return -EIO; | |
2463 | ||
2464 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2465 | if (!rv) { | |
2466 | if (rdev->mddev == NULL) | |
2467 | rv = -EBUSY; | |
2468 | else | |
2469 | rv = entry->show(rdev, page); | |
2470 | mddev_unlock(mddev); | |
2471 | } | |
2472 | return rv; | |
2473 | } | |
2474 | ||
2475 | static ssize_t | |
2476 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2477 | const char *page, size_t length) | |
2478 | { | |
2479 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2480 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
2481 | ssize_t rv; | |
2482 | mddev_t *mddev = rdev->mddev; | |
2483 | ||
2484 | if (!entry->store) | |
2485 | return -EIO; | |
2486 | if (!capable(CAP_SYS_ADMIN)) | |
2487 | return -EACCES; | |
2488 | rv = mddev ? mddev_lock(mddev): -EBUSY; | |
2489 | if (!rv) { | |
2490 | if (rdev->mddev == NULL) | |
2491 | rv = -EBUSY; | |
2492 | else | |
2493 | rv = entry->store(rdev, page, length); | |
2494 | mddev_unlock(mddev); | |
2495 | } | |
2496 | return rv; | |
2497 | } | |
2498 | ||
2499 | static void rdev_free(struct kobject *ko) | |
2500 | { | |
2501 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2502 | kfree(rdev); | |
2503 | } | |
2504 | static struct sysfs_ops rdev_sysfs_ops = { | |
2505 | .show = rdev_attr_show, | |
2506 | .store = rdev_attr_store, | |
2507 | }; | |
2508 | static struct kobj_type rdev_ktype = { | |
2509 | .release = rdev_free, | |
2510 | .sysfs_ops = &rdev_sysfs_ops, | |
2511 | .default_attrs = rdev_default_attrs, | |
2512 | }; | |
2513 | ||
2514 | /* | |
2515 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2516 | * | |
2517 | * mark the device faulty if: | |
2518 | * | |
2519 | * - the device is nonexistent (zero size) | |
2520 | * - the device has no valid superblock | |
2521 | * | |
2522 | * a faulty rdev _never_ has rdev->sb set. | |
2523 | */ | |
2524 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2525 | { | |
2526 | char b[BDEVNAME_SIZE]; | |
2527 | int err; | |
2528 | mdk_rdev_t *rdev; | |
2529 | sector_t size; | |
2530 | ||
2531 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); | |
2532 | if (!rdev) { | |
2533 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2534 | return ERR_PTR(-ENOMEM); | |
2535 | } | |
2536 | ||
2537 | if ((err = alloc_disk_sb(rdev))) | |
2538 | goto abort_free; | |
2539 | ||
2540 | err = lock_rdev(rdev, newdev, super_format == -2); | |
2541 | if (err) | |
2542 | goto abort_free; | |
2543 | ||
2544 | kobject_init(&rdev->kobj, &rdev_ktype); | |
2545 | ||
2546 | rdev->desc_nr = -1; | |
2547 | rdev->saved_raid_disk = -1; | |
2548 | rdev->raid_disk = -1; | |
2549 | rdev->flags = 0; | |
2550 | rdev->data_offset = 0; | |
2551 | rdev->sb_events = 0; | |
2552 | atomic_set(&rdev->nr_pending, 0); | |
2553 | atomic_set(&rdev->read_errors, 0); | |
2554 | atomic_set(&rdev->corrected_errors, 0); | |
2555 | ||
2556 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2557 | if (!size) { | |
2558 | printk(KERN_WARNING | |
2559 | "md: %s has zero or unknown size, marking faulty!\n", | |
2560 | bdevname(rdev->bdev,b)); | |
2561 | err = -EINVAL; | |
2562 | goto abort_free; | |
2563 | } | |
2564 | ||
2565 | if (super_format >= 0) { | |
2566 | err = super_types[super_format]. | |
2567 | load_super(rdev, NULL, super_minor); | |
2568 | if (err == -EINVAL) { | |
2569 | printk(KERN_WARNING | |
2570 | "md: %s does not have a valid v%d.%d " | |
2571 | "superblock, not importing!\n", | |
2572 | bdevname(rdev->bdev,b), | |
2573 | super_format, super_minor); | |
2574 | goto abort_free; | |
2575 | } | |
2576 | if (err < 0) { | |
2577 | printk(KERN_WARNING | |
2578 | "md: could not read %s's sb, not importing!\n", | |
2579 | bdevname(rdev->bdev,b)); | |
2580 | goto abort_free; | |
2581 | } | |
2582 | } | |
2583 | ||
2584 | INIT_LIST_HEAD(&rdev->same_set); | |
2585 | init_waitqueue_head(&rdev->blocked_wait); | |
2586 | ||
2587 | return rdev; | |
2588 | ||
2589 | abort_free: | |
2590 | if (rdev->sb_page) { | |
2591 | if (rdev->bdev) | |
2592 | unlock_rdev(rdev); | |
2593 | free_disk_sb(rdev); | |
2594 | } | |
2595 | kfree(rdev); | |
2596 | return ERR_PTR(err); | |
2597 | } | |
2598 | ||
2599 | /* | |
2600 | * Check a full RAID array for plausibility | |
2601 | */ | |
2602 | ||
2603 | ||
2604 | static void analyze_sbs(mddev_t * mddev) | |
2605 | { | |
2606 | int i; | |
2607 | mdk_rdev_t *rdev, *freshest, *tmp; | |
2608 | char b[BDEVNAME_SIZE]; | |
2609 | ||
2610 | freshest = NULL; | |
2611 | rdev_for_each(rdev, tmp, mddev) | |
2612 | switch (super_types[mddev->major_version]. | |
2613 | load_super(rdev, freshest, mddev->minor_version)) { | |
2614 | case 1: | |
2615 | freshest = rdev; | |
2616 | break; | |
2617 | case 0: | |
2618 | break; | |
2619 | default: | |
2620 | printk( KERN_ERR \ | |
2621 | "md: fatal superblock inconsistency in %s" | |
2622 | " -- removing from array\n", | |
2623 | bdevname(rdev->bdev,b)); | |
2624 | kick_rdev_from_array(rdev); | |
2625 | } | |
2626 | ||
2627 | ||
2628 | super_types[mddev->major_version]. | |
2629 | validate_super(mddev, freshest); | |
2630 | ||
2631 | i = 0; | |
2632 | rdev_for_each(rdev, tmp, mddev) { | |
2633 | if (rdev->desc_nr >= mddev->max_disks || | |
2634 | i > mddev->max_disks) { | |
2635 | printk(KERN_WARNING | |
2636 | "md: %s: %s: only %d devices permitted\n", | |
2637 | mdname(mddev), bdevname(rdev->bdev, b), | |
2638 | mddev->max_disks); | |
2639 | kick_rdev_from_array(rdev); | |
2640 | continue; | |
2641 | } | |
2642 | if (rdev != freshest) | |
2643 | if (super_types[mddev->major_version]. | |
2644 | validate_super(mddev, rdev)) { | |
2645 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2646 | " from array!\n", | |
2647 | bdevname(rdev->bdev,b)); | |
2648 | kick_rdev_from_array(rdev); | |
2649 | continue; | |
2650 | } | |
2651 | if (mddev->level == LEVEL_MULTIPATH) { | |
2652 | rdev->desc_nr = i++; | |
2653 | rdev->raid_disk = rdev->desc_nr; | |
2654 | set_bit(In_sync, &rdev->flags); | |
2655 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { | |
2656 | rdev->raid_disk = -1; | |
2657 | clear_bit(In_sync, &rdev->flags); | |
2658 | } | |
2659 | } | |
2660 | } | |
2661 | ||
2662 | static void md_safemode_timeout(unsigned long data); | |
2663 | ||
2664 | static ssize_t | |
2665 | safe_delay_show(mddev_t *mddev, char *page) | |
2666 | { | |
2667 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2668 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2669 | } | |
2670 | static ssize_t | |
2671 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2672 | { | |
2673 | int scale=1; | |
2674 | int dot=0; | |
2675 | int i; | |
2676 | unsigned long msec; | |
2677 | char buf[30]; | |
2678 | ||
2679 | /* remove a period, and count digits after it */ | |
2680 | if (len >= sizeof(buf)) | |
2681 | return -EINVAL; | |
2682 | strlcpy(buf, cbuf, sizeof(buf)); | |
2683 | for (i=0; i<len; i++) { | |
2684 | if (dot) { | |
2685 | if (isdigit(buf[i])) { | |
2686 | buf[i-1] = buf[i]; | |
2687 | scale *= 10; | |
2688 | } | |
2689 | buf[i] = 0; | |
2690 | } else if (buf[i] == '.') { | |
2691 | dot=1; | |
2692 | buf[i] = 0; | |
2693 | } | |
2694 | } | |
2695 | if (strict_strtoul(buf, 10, &msec) < 0) | |
2696 | return -EINVAL; | |
2697 | msec = (msec * 1000) / scale; | |
2698 | if (msec == 0) | |
2699 | mddev->safemode_delay = 0; | |
2700 | else { | |
2701 | unsigned long old_delay = mddev->safemode_delay; | |
2702 | mddev->safemode_delay = (msec*HZ)/1000; | |
2703 | if (mddev->safemode_delay == 0) | |
2704 | mddev->safemode_delay = 1; | |
2705 | if (mddev->safemode_delay < old_delay) | |
2706 | md_safemode_timeout((unsigned long)mddev); | |
2707 | } | |
2708 | return len; | |
2709 | } | |
2710 | static struct md_sysfs_entry md_safe_delay = | |
2711 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); | |
2712 | ||
2713 | static ssize_t | |
2714 | level_show(mddev_t *mddev, char *page) | |
2715 | { | |
2716 | struct mdk_personality *p = mddev->pers; | |
2717 | if (p) | |
2718 | return sprintf(page, "%s\n", p->name); | |
2719 | else if (mddev->clevel[0]) | |
2720 | return sprintf(page, "%s\n", mddev->clevel); | |
2721 | else if (mddev->level != LEVEL_NONE) | |
2722 | return sprintf(page, "%d\n", mddev->level); | |
2723 | else | |
2724 | return 0; | |
2725 | } | |
2726 | ||
2727 | static ssize_t | |
2728 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2729 | { | |
2730 | char level[16]; | |
2731 | ssize_t rv = len; | |
2732 | struct mdk_personality *pers; | |
2733 | void *priv; | |
2734 | mdk_rdev_t *rdev; | |
2735 | ||
2736 | if (mddev->pers == NULL) { | |
2737 | if (len == 0) | |
2738 | return 0; | |
2739 | if (len >= sizeof(mddev->clevel)) | |
2740 | return -ENOSPC; | |
2741 | strncpy(mddev->clevel, buf, len); | |
2742 | if (mddev->clevel[len-1] == '\n') | |
2743 | len--; | |
2744 | mddev->clevel[len] = 0; | |
2745 | mddev->level = LEVEL_NONE; | |
2746 | return rv; | |
2747 | } | |
2748 | ||
2749 | /* request to change the personality. Need to ensure: | |
2750 | * - array is not engaged in resync/recovery/reshape | |
2751 | * - old personality can be suspended | |
2752 | * - new personality will access other array. | |
2753 | */ | |
2754 | ||
2755 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) | |
2756 | return -EBUSY; | |
2757 | ||
2758 | if (!mddev->pers->quiesce) { | |
2759 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
2760 | mdname(mddev), mddev->pers->name); | |
2761 | return -EINVAL; | |
2762 | } | |
2763 | ||
2764 | /* Now find the new personality */ | |
2765 | if (len == 0 || len >= sizeof(level)) | |
2766 | return -EINVAL; | |
2767 | strncpy(level, buf, len); | |
2768 | if (level[len-1] == '\n') | |
2769 | len--; | |
2770 | level[len] = 0; | |
2771 | ||
2772 | request_module("md-%s", level); | |
2773 | spin_lock(&pers_lock); | |
2774 | pers = find_pers(LEVEL_NONE, level); | |
2775 | if (!pers || !try_module_get(pers->owner)) { | |
2776 | spin_unlock(&pers_lock); | |
2777 | printk(KERN_WARNING "md: personality %s not loaded\n", level); | |
2778 | return -EINVAL; | |
2779 | } | |
2780 | spin_unlock(&pers_lock); | |
2781 | ||
2782 | if (pers == mddev->pers) { | |
2783 | /* Nothing to do! */ | |
2784 | module_put(pers->owner); | |
2785 | return rv; | |
2786 | } | |
2787 | if (!pers->takeover) { | |
2788 | module_put(pers->owner); | |
2789 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
2790 | mdname(mddev), level); | |
2791 | return -EINVAL; | |
2792 | } | |
2793 | ||
2794 | /* ->takeover must set new_* and/or delta_disks | |
2795 | * if it succeeds, and may set them when it fails. | |
2796 | */ | |
2797 | priv = pers->takeover(mddev); | |
2798 | if (IS_ERR(priv)) { | |
2799 | mddev->new_level = mddev->level; | |
2800 | mddev->new_layout = mddev->layout; | |
2801 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
2802 | mddev->raid_disks -= mddev->delta_disks; | |
2803 | mddev->delta_disks = 0; | |
2804 | module_put(pers->owner); | |
2805 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
2806 | mdname(mddev), level); | |
2807 | return PTR_ERR(priv); | |
2808 | } | |
2809 | ||
2810 | /* Looks like we have a winner */ | |
2811 | mddev_suspend(mddev); | |
2812 | mddev->pers->stop(mddev); | |
2813 | module_put(mddev->pers->owner); | |
2814 | /* Invalidate devices that are now superfluous */ | |
2815 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
2816 | if (rdev->raid_disk >= mddev->raid_disks) { | |
2817 | rdev->raid_disk = -1; | |
2818 | clear_bit(In_sync, &rdev->flags); | |
2819 | } | |
2820 | mddev->pers = pers; | |
2821 | mddev->private = priv; | |
2822 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
2823 | mddev->level = mddev->new_level; | |
2824 | mddev->layout = mddev->new_layout; | |
2825 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
2826 | mddev->delta_disks = 0; | |
2827 | pers->run(mddev); | |
2828 | mddev_resume(mddev); | |
2829 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2830 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2831 | md_wakeup_thread(mddev->thread); | |
2832 | return rv; | |
2833 | } | |
2834 | ||
2835 | static struct md_sysfs_entry md_level = | |
2836 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); | |
2837 | ||
2838 | ||
2839 | static ssize_t | |
2840 | layout_show(mddev_t *mddev, char *page) | |
2841 | { | |
2842 | /* just a number, not meaningful for all levels */ | |
2843 | if (mddev->reshape_position != MaxSector && | |
2844 | mddev->layout != mddev->new_layout) | |
2845 | return sprintf(page, "%d (%d)\n", | |
2846 | mddev->new_layout, mddev->layout); | |
2847 | return sprintf(page, "%d\n", mddev->layout); | |
2848 | } | |
2849 | ||
2850 | static ssize_t | |
2851 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2852 | { | |
2853 | char *e; | |
2854 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2855 | ||
2856 | if (!*buf || (*e && *e != '\n')) | |
2857 | return -EINVAL; | |
2858 | ||
2859 | if (mddev->pers) { | |
2860 | int err; | |
2861 | if (mddev->pers->check_reshape == NULL) | |
2862 | return -EBUSY; | |
2863 | mddev->new_layout = n; | |
2864 | err = mddev->pers->check_reshape(mddev); | |
2865 | if (err) { | |
2866 | mddev->new_layout = mddev->layout; | |
2867 | return err; | |
2868 | } | |
2869 | } else { | |
2870 | mddev->new_layout = n; | |
2871 | if (mddev->reshape_position == MaxSector) | |
2872 | mddev->layout = n; | |
2873 | } | |
2874 | return len; | |
2875 | } | |
2876 | static struct md_sysfs_entry md_layout = | |
2877 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); | |
2878 | ||
2879 | ||
2880 | static ssize_t | |
2881 | raid_disks_show(mddev_t *mddev, char *page) | |
2882 | { | |
2883 | if (mddev->raid_disks == 0) | |
2884 | return 0; | |
2885 | if (mddev->reshape_position != MaxSector && | |
2886 | mddev->delta_disks != 0) | |
2887 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
2888 | mddev->raid_disks - mddev->delta_disks); | |
2889 | return sprintf(page, "%d\n", mddev->raid_disks); | |
2890 | } | |
2891 | ||
2892 | static int update_raid_disks(mddev_t *mddev, int raid_disks); | |
2893 | ||
2894 | static ssize_t | |
2895 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
2896 | { | |
2897 | char *e; | |
2898 | int rv = 0; | |
2899 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2900 | ||
2901 | if (!*buf || (*e && *e != '\n')) | |
2902 | return -EINVAL; | |
2903 | ||
2904 | if (mddev->pers) | |
2905 | rv = update_raid_disks(mddev, n); | |
2906 | else if (mddev->reshape_position != MaxSector) { | |
2907 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
2908 | mddev->delta_disks = n - olddisks; | |
2909 | mddev->raid_disks = n; | |
2910 | } else | |
2911 | mddev->raid_disks = n; | |
2912 | return rv ? rv : len; | |
2913 | } | |
2914 | static struct md_sysfs_entry md_raid_disks = | |
2915 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); | |
2916 | ||
2917 | static ssize_t | |
2918 | chunk_size_show(mddev_t *mddev, char *page) | |
2919 | { | |
2920 | if (mddev->reshape_position != MaxSector && | |
2921 | mddev->chunk_sectors != mddev->new_chunk_sectors) | |
2922 | return sprintf(page, "%d (%d)\n", | |
2923 | mddev->new_chunk_sectors << 9, | |
2924 | mddev->chunk_sectors << 9); | |
2925 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
2926 | } | |
2927 | ||
2928 | static ssize_t | |
2929 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
2930 | { | |
2931 | char *e; | |
2932 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2933 | ||
2934 | if (!*buf || (*e && *e != '\n')) | |
2935 | return -EINVAL; | |
2936 | ||
2937 | if (mddev->pers) { | |
2938 | int err; | |
2939 | if (mddev->pers->check_reshape == NULL) | |
2940 | return -EBUSY; | |
2941 | mddev->new_chunk_sectors = n >> 9; | |
2942 | err = mddev->pers->check_reshape(mddev); | |
2943 | if (err) { | |
2944 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
2945 | return err; | |
2946 | } | |
2947 | } else { | |
2948 | mddev->new_chunk_sectors = n >> 9; | |
2949 | if (mddev->reshape_position == MaxSector) | |
2950 | mddev->chunk_sectors = n >> 9; | |
2951 | } | |
2952 | return len; | |
2953 | } | |
2954 | static struct md_sysfs_entry md_chunk_size = | |
2955 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); | |
2956 | ||
2957 | static ssize_t | |
2958 | resync_start_show(mddev_t *mddev, char *page) | |
2959 | { | |
2960 | if (mddev->recovery_cp == MaxSector) | |
2961 | return sprintf(page, "none\n"); | |
2962 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); | |
2963 | } | |
2964 | ||
2965 | static ssize_t | |
2966 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
2967 | { | |
2968 | char *e; | |
2969 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
2970 | ||
2971 | if (mddev->pers) | |
2972 | return -EBUSY; | |
2973 | if (!*buf || (*e && *e != '\n')) | |
2974 | return -EINVAL; | |
2975 | ||
2976 | mddev->recovery_cp = n; | |
2977 | return len; | |
2978 | } | |
2979 | static struct md_sysfs_entry md_resync_start = | |
2980 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); | |
2981 | ||
2982 | /* | |
2983 | * The array state can be: | |
2984 | * | |
2985 | * clear | |
2986 | * No devices, no size, no level | |
2987 | * Equivalent to STOP_ARRAY ioctl | |
2988 | * inactive | |
2989 | * May have some settings, but array is not active | |
2990 | * all IO results in error | |
2991 | * When written, doesn't tear down array, but just stops it | |
2992 | * suspended (not supported yet) | |
2993 | * All IO requests will block. The array can be reconfigured. | |
2994 | * Writing this, if accepted, will block until array is quiescent | |
2995 | * readonly | |
2996 | * no resync can happen. no superblocks get written. | |
2997 | * write requests fail | |
2998 | * read-auto | |
2999 | * like readonly, but behaves like 'clean' on a write request. | |
3000 | * | |
3001 | * clean - no pending writes, but otherwise active. | |
3002 | * When written to inactive array, starts without resync | |
3003 | * If a write request arrives then | |
3004 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3005 | * if not known, block and switch to write-pending | |
3006 | * If written to an active array that has pending writes, then fails. | |
3007 | * active | |
3008 | * fully active: IO and resync can be happening. | |
3009 | * When written to inactive array, starts with resync | |
3010 | * | |
3011 | * write-pending | |
3012 | * clean, but writes are blocked waiting for 'active' to be written. | |
3013 | * | |
3014 | * active-idle | |
3015 | * like active, but no writes have been seen for a while (100msec). | |
3016 | * | |
3017 | */ | |
3018 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3019 | write_pending, active_idle, bad_word}; | |
3020 | static char *array_states[] = { | |
3021 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", | |
3022 | "write-pending", "active-idle", NULL }; | |
3023 | ||
3024 | static int match_word(const char *word, char **list) | |
3025 | { | |
3026 | int n; | |
3027 | for (n=0; list[n]; n++) | |
3028 | if (cmd_match(word, list[n])) | |
3029 | break; | |
3030 | return n; | |
3031 | } | |
3032 | ||
3033 | static ssize_t | |
3034 | array_state_show(mddev_t *mddev, char *page) | |
3035 | { | |
3036 | enum array_state st = inactive; | |
3037 | ||
3038 | if (mddev->pers) | |
3039 | switch(mddev->ro) { | |
3040 | case 1: | |
3041 | st = readonly; | |
3042 | break; | |
3043 | case 2: | |
3044 | st = read_auto; | |
3045 | break; | |
3046 | case 0: | |
3047 | if (mddev->in_sync) | |
3048 | st = clean; | |
3049 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
3050 | st = write_pending; | |
3051 | else if (mddev->safemode) | |
3052 | st = active_idle; | |
3053 | else | |
3054 | st = active; | |
3055 | } | |
3056 | else { | |
3057 | if (list_empty(&mddev->disks) && | |
3058 | mddev->raid_disks == 0 && | |
3059 | mddev->dev_sectors == 0) | |
3060 | st = clear; | |
3061 | else | |
3062 | st = inactive; | |
3063 | } | |
3064 | return sprintf(page, "%s\n", array_states[st]); | |
3065 | } | |
3066 | ||
3067 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); | |
3068 | static int do_md_run(mddev_t * mddev); | |
3069 | static int restart_array(mddev_t *mddev); | |
3070 | ||
3071 | static ssize_t | |
3072 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3073 | { | |
3074 | int err = -EINVAL; | |
3075 | enum array_state st = match_word(buf, array_states); | |
3076 | switch(st) { | |
3077 | case bad_word: | |
3078 | break; | |
3079 | case clear: | |
3080 | /* stopping an active array */ | |
3081 | if (atomic_read(&mddev->openers) > 0) | |
3082 | return -EBUSY; | |
3083 | err = do_md_stop(mddev, 0, 0); | |
3084 | break; | |
3085 | case inactive: | |
3086 | /* stopping an active array */ | |
3087 | if (mddev->pers) { | |
3088 | if (atomic_read(&mddev->openers) > 0) | |
3089 | return -EBUSY; | |
3090 | err = do_md_stop(mddev, 2, 0); | |
3091 | } else | |
3092 | err = 0; /* already inactive */ | |
3093 | break; | |
3094 | case suspended: | |
3095 | break; /* not supported yet */ | |
3096 | case readonly: | |
3097 | if (mddev->pers) | |
3098 | err = do_md_stop(mddev, 1, 0); | |
3099 | else { | |
3100 | mddev->ro = 1; | |
3101 | set_disk_ro(mddev->gendisk, 1); | |
3102 | err = do_md_run(mddev); | |
3103 | } | |
3104 | break; | |
3105 | case read_auto: | |
3106 | if (mddev->pers) { | |
3107 | if (mddev->ro == 0) | |
3108 | err = do_md_stop(mddev, 1, 0); | |
3109 | else if (mddev->ro == 1) | |
3110 | err = restart_array(mddev); | |
3111 | if (err == 0) { | |
3112 | mddev->ro = 2; | |
3113 | set_disk_ro(mddev->gendisk, 0); | |
3114 | } | |
3115 | } else { | |
3116 | mddev->ro = 2; | |
3117 | err = do_md_run(mddev); | |
3118 | } | |
3119 | break; | |
3120 | case clean: | |
3121 | if (mddev->pers) { | |
3122 | restart_array(mddev); | |
3123 | spin_lock_irq(&mddev->write_lock); | |
3124 | if (atomic_read(&mddev->writes_pending) == 0) { | |
3125 | if (mddev->in_sync == 0) { | |
3126 | mddev->in_sync = 1; | |
3127 | if (mddev->safemode == 1) | |
3128 | mddev->safemode = 0; | |
3129 | if (mddev->persistent) | |
3130 | set_bit(MD_CHANGE_CLEAN, | |
3131 | &mddev->flags); | |
3132 | } | |
3133 | err = 0; | |
3134 | } else | |
3135 | err = -EBUSY; | |
3136 | spin_unlock_irq(&mddev->write_lock); | |
3137 | } else | |
3138 | err = -EINVAL; | |
3139 | break; | |
3140 | case active: | |
3141 | if (mddev->pers) { | |
3142 | restart_array(mddev); | |
3143 | if (mddev->external) | |
3144 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3145 | wake_up(&mddev->sb_wait); | |
3146 | err = 0; | |
3147 | } else { | |
3148 | mddev->ro = 0; | |
3149 | set_disk_ro(mddev->gendisk, 0); | |
3150 | err = do_md_run(mddev); | |
3151 | } | |
3152 | break; | |
3153 | case write_pending: | |
3154 | case active_idle: | |
3155 | /* these cannot be set */ | |
3156 | break; | |
3157 | } | |
3158 | if (err) | |
3159 | return err; | |
3160 | else { | |
3161 | sysfs_notify_dirent(mddev->sysfs_state); | |
3162 | return len; | |
3163 | } | |
3164 | } | |
3165 | static struct md_sysfs_entry md_array_state = | |
3166 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
3167 | ||
3168 | static ssize_t | |
3169 | null_show(mddev_t *mddev, char *page) | |
3170 | { | |
3171 | return -EINVAL; | |
3172 | } | |
3173 | ||
3174 | static ssize_t | |
3175 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3176 | { | |
3177 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3178 | /* The new device is added to the array. | |
3179 | * If the array has a persistent superblock, we read the | |
3180 | * superblock to initialise info and check validity. | |
3181 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3182 | * which mainly checks size. | |
3183 | */ | |
3184 | char *e; | |
3185 | int major = simple_strtoul(buf, &e, 10); | |
3186 | int minor; | |
3187 | dev_t dev; | |
3188 | mdk_rdev_t *rdev; | |
3189 | int err; | |
3190 | ||
3191 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3192 | return -EINVAL; | |
3193 | minor = simple_strtoul(e+1, &e, 10); | |
3194 | if (*e && *e != '\n') | |
3195 | return -EINVAL; | |
3196 | dev = MKDEV(major, minor); | |
3197 | if (major != MAJOR(dev) || | |
3198 | minor != MINOR(dev)) | |
3199 | return -EOVERFLOW; | |
3200 | ||
3201 | ||
3202 | if (mddev->persistent) { | |
3203 | rdev = md_import_device(dev, mddev->major_version, | |
3204 | mddev->minor_version); | |
3205 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3206 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3207 | mdk_rdev_t, same_set); | |
3208 | err = super_types[mddev->major_version] | |
3209 | .load_super(rdev, rdev0, mddev->minor_version); | |
3210 | if (err < 0) | |
3211 | goto out; | |
3212 | } | |
3213 | } else if (mddev->external) | |
3214 | rdev = md_import_device(dev, -2, -1); | |
3215 | else | |
3216 | rdev = md_import_device(dev, -1, -1); | |
3217 | ||
3218 | if (IS_ERR(rdev)) | |
3219 | return PTR_ERR(rdev); | |
3220 | err = bind_rdev_to_array(rdev, mddev); | |
3221 | out: | |
3222 | if (err) | |
3223 | export_rdev(rdev); | |
3224 | return err ? err : len; | |
3225 | } | |
3226 | ||
3227 | static struct md_sysfs_entry md_new_device = | |
3228 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); | |
3229 | ||
3230 | static ssize_t | |
3231 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3232 | { | |
3233 | char *end; | |
3234 | unsigned long chunk, end_chunk; | |
3235 | ||
3236 | if (!mddev->bitmap) | |
3237 | goto out; | |
3238 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3239 | while (*buf) { | |
3240 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3241 | if (buf == end) break; | |
3242 | if (*end == '-') { /* range */ | |
3243 | buf = end + 1; | |
3244 | end_chunk = simple_strtoul(buf, &end, 0); | |
3245 | if (buf == end) break; | |
3246 | } | |
3247 | if (*end && !isspace(*end)) break; | |
3248 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
3249 | buf = end; | |
3250 | while (isspace(*buf)) buf++; | |
3251 | } | |
3252 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3253 | out: | |
3254 | return len; | |
3255 | } | |
3256 | ||
3257 | static struct md_sysfs_entry md_bitmap = | |
3258 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3259 | ||
3260 | static ssize_t | |
3261 | size_show(mddev_t *mddev, char *page) | |
3262 | { | |
3263 | return sprintf(page, "%llu\n", | |
3264 | (unsigned long long)mddev->dev_sectors / 2); | |
3265 | } | |
3266 | ||
3267 | static int update_size(mddev_t *mddev, sector_t num_sectors); | |
3268 | ||
3269 | static ssize_t | |
3270 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3271 | { | |
3272 | /* If array is inactive, we can reduce the component size, but | |
3273 | * not increase it (except from 0). | |
3274 | * If array is active, we can try an on-line resize | |
3275 | */ | |
3276 | sector_t sectors; | |
3277 | int err = strict_blocks_to_sectors(buf, §ors); | |
3278 | ||
3279 | if (err < 0) | |
3280 | return err; | |
3281 | if (mddev->pers) { | |
3282 | err = update_size(mddev, sectors); | |
3283 | md_update_sb(mddev, 1); | |
3284 | } else { | |
3285 | if (mddev->dev_sectors == 0 || | |
3286 | mddev->dev_sectors > sectors) | |
3287 | mddev->dev_sectors = sectors; | |
3288 | else | |
3289 | err = -ENOSPC; | |
3290 | } | |
3291 | return err ? err : len; | |
3292 | } | |
3293 | ||
3294 | static struct md_sysfs_entry md_size = | |
3295 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); | |
3296 | ||
3297 | ||
3298 | /* Metdata version. | |
3299 | * This is one of | |
3300 | * 'none' for arrays with no metadata (good luck...) | |
3301 | * 'external' for arrays with externally managed metadata, | |
3302 | * or N.M for internally known formats | |
3303 | */ | |
3304 | static ssize_t | |
3305 | metadata_show(mddev_t *mddev, char *page) | |
3306 | { | |
3307 | if (mddev->persistent) | |
3308 | return sprintf(page, "%d.%d\n", | |
3309 | mddev->major_version, mddev->minor_version); | |
3310 | else if (mddev->external) | |
3311 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
3312 | else | |
3313 | return sprintf(page, "none\n"); | |
3314 | } | |
3315 | ||
3316 | static ssize_t | |
3317 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3318 | { | |
3319 | int major, minor; | |
3320 | char *e; | |
3321 | /* Changing the details of 'external' metadata is | |
3322 | * always permitted. Otherwise there must be | |
3323 | * no devices attached to the array. | |
3324 | */ | |
3325 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3326 | ; | |
3327 | else if (!list_empty(&mddev->disks)) | |
3328 | return -EBUSY; | |
3329 | ||
3330 | if (cmd_match(buf, "none")) { | |
3331 | mddev->persistent = 0; | |
3332 | mddev->external = 0; | |
3333 | mddev->major_version = 0; | |
3334 | mddev->minor_version = 90; | |
3335 | return len; | |
3336 | } | |
3337 | if (strncmp(buf, "external:", 9) == 0) { | |
3338 | size_t namelen = len-9; | |
3339 | if (namelen >= sizeof(mddev->metadata_type)) | |
3340 | namelen = sizeof(mddev->metadata_type)-1; | |
3341 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3342 | mddev->metadata_type[namelen] = 0; | |
3343 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3344 | mddev->metadata_type[--namelen] = 0; | |
3345 | mddev->persistent = 0; | |
3346 | mddev->external = 1; | |
3347 | mddev->major_version = 0; | |
3348 | mddev->minor_version = 90; | |
3349 | return len; | |
3350 | } | |
3351 | major = simple_strtoul(buf, &e, 10); | |
3352 | if (e==buf || *e != '.') | |
3353 | return -EINVAL; | |
3354 | buf = e+1; | |
3355 | minor = simple_strtoul(buf, &e, 10); | |
3356 | if (e==buf || (*e && *e != '\n') ) | |
3357 | return -EINVAL; | |
3358 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) | |
3359 | return -ENOENT; | |
3360 | mddev->major_version = major; | |
3361 | mddev->minor_version = minor; | |
3362 | mddev->persistent = 1; | |
3363 | mddev->external = 0; | |
3364 | return len; | |
3365 | } | |
3366 | ||
3367 | static struct md_sysfs_entry md_metadata = | |
3368 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
3369 | ||
3370 | static ssize_t | |
3371 | action_show(mddev_t *mddev, char *page) | |
3372 | { | |
3373 | char *type = "idle"; | |
3374 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
3375 | type = "frozen"; | |
3376 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
3377 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { | |
3378 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
3379 | type = "reshape"; | |
3380 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
3381 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
3382 | type = "resync"; | |
3383 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3384 | type = "check"; | |
3385 | else | |
3386 | type = "repair"; | |
3387 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
3388 | type = "recover"; | |
3389 | } | |
3390 | return sprintf(page, "%s\n", type); | |
3391 | } | |
3392 | ||
3393 | static ssize_t | |
3394 | action_store(mddev_t *mddev, const char *page, size_t len) | |
3395 | { | |
3396 | if (!mddev->pers || !mddev->pers->sync_request) | |
3397 | return -EINVAL; | |
3398 | ||
3399 | if (cmd_match(page, "frozen")) | |
3400 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3401 | else | |
3402 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3403 | ||
3404 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
3405 | if (mddev->sync_thread) { | |
3406 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3407 | md_unregister_thread(mddev->sync_thread); | |
3408 | mddev->sync_thread = NULL; | |
3409 | mddev->recovery = 0; | |
3410 | } | |
3411 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
3412 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
3413 | return -EBUSY; | |
3414 | else if (cmd_match(page, "resync")) | |
3415 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3416 | else if (cmd_match(page, "recover")) { | |
3417 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
3418 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3419 | } else if (cmd_match(page, "reshape")) { | |
3420 | int err; | |
3421 | if (mddev->pers->start_reshape == NULL) | |
3422 | return -EINVAL; | |
3423 | err = mddev->pers->start_reshape(mddev); | |
3424 | if (err) | |
3425 | return err; | |
3426 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
3427 | } else { | |
3428 | if (cmd_match(page, "check")) | |
3429 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
3430 | else if (!cmd_match(page, "repair")) | |
3431 | return -EINVAL; | |
3432 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3433 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
3434 | } | |
3435 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3436 | md_wakeup_thread(mddev->thread); | |
3437 | sysfs_notify_dirent(mddev->sysfs_action); | |
3438 | return len; | |
3439 | } | |
3440 | ||
3441 | static ssize_t | |
3442 | mismatch_cnt_show(mddev_t *mddev, char *page) | |
3443 | { | |
3444 | return sprintf(page, "%llu\n", | |
3445 | (unsigned long long) mddev->resync_mismatches); | |
3446 | } | |
3447 | ||
3448 | static struct md_sysfs_entry md_scan_mode = | |
3449 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
3450 | ||
3451 | ||
3452 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); | |
3453 | ||
3454 | static ssize_t | |
3455 | sync_min_show(mddev_t *mddev, char *page) | |
3456 | { | |
3457 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3458 | mddev->sync_speed_min ? "local": "system"); | |
3459 | } | |
3460 | ||
3461 | static ssize_t | |
3462 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3463 | { | |
3464 | int min; | |
3465 | char *e; | |
3466 | if (strncmp(buf, "system", 6)==0) { | |
3467 | mddev->sync_speed_min = 0; | |
3468 | return len; | |
3469 | } | |
3470 | min = simple_strtoul(buf, &e, 10); | |
3471 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3472 | return -EINVAL; | |
3473 | mddev->sync_speed_min = min; | |
3474 | return len; | |
3475 | } | |
3476 | ||
3477 | static struct md_sysfs_entry md_sync_min = | |
3478 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3479 | ||
3480 | static ssize_t | |
3481 | sync_max_show(mddev_t *mddev, char *page) | |
3482 | { | |
3483 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3484 | mddev->sync_speed_max ? "local": "system"); | |
3485 | } | |
3486 | ||
3487 | static ssize_t | |
3488 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3489 | { | |
3490 | int max; | |
3491 | char *e; | |
3492 | if (strncmp(buf, "system", 6)==0) { | |
3493 | mddev->sync_speed_max = 0; | |
3494 | return len; | |
3495 | } | |
3496 | max = simple_strtoul(buf, &e, 10); | |
3497 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3498 | return -EINVAL; | |
3499 | mddev->sync_speed_max = max; | |
3500 | return len; | |
3501 | } | |
3502 | ||
3503 | static struct md_sysfs_entry md_sync_max = | |
3504 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3505 | ||
3506 | static ssize_t | |
3507 | degraded_show(mddev_t *mddev, char *page) | |
3508 | { | |
3509 | return sprintf(page, "%d\n", mddev->degraded); | |
3510 | } | |
3511 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
3512 | ||
3513 | static ssize_t | |
3514 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3515 | { | |
3516 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3517 | } | |
3518 | ||
3519 | static ssize_t | |
3520 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3521 | { | |
3522 | long n; | |
3523 | ||
3524 | if (strict_strtol(buf, 10, &n)) | |
3525 | return -EINVAL; | |
3526 | ||
3527 | if (n != 0 && n != 1) | |
3528 | return -EINVAL; | |
3529 | ||
3530 | mddev->parallel_resync = n; | |
3531 | ||
3532 | if (mddev->sync_thread) | |
3533 | wake_up(&resync_wait); | |
3534 | ||
3535 | return len; | |
3536 | } | |
3537 | ||
3538 | /* force parallel resync, even with shared block devices */ | |
3539 | static struct md_sysfs_entry md_sync_force_parallel = | |
3540 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3541 | sync_force_parallel_show, sync_force_parallel_store); | |
3542 | ||
3543 | static ssize_t | |
3544 | sync_speed_show(mddev_t *mddev, char *page) | |
3545 | { | |
3546 | unsigned long resync, dt, db; | |
3547 | if (mddev->curr_resync == 0) | |
3548 | return sprintf(page, "none\n"); | |
3549 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); | |
3550 | dt = (jiffies - mddev->resync_mark) / HZ; | |
3551 | if (!dt) dt++; | |
3552 | db = resync - mddev->resync_mark_cnt; | |
3553 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
3554 | } | |
3555 | ||
3556 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); | |
3557 | ||
3558 | static ssize_t | |
3559 | sync_completed_show(mddev_t *mddev, char *page) | |
3560 | { | |
3561 | unsigned long max_sectors, resync; | |
3562 | ||
3563 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3564 | return sprintf(page, "none\n"); | |
3565 | ||
3566 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3567 | max_sectors = mddev->resync_max_sectors; | |
3568 | else | |
3569 | max_sectors = mddev->dev_sectors; | |
3570 | ||
3571 | resync = mddev->curr_resync_completed; | |
3572 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); | |
3573 | } | |
3574 | ||
3575 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); | |
3576 | ||
3577 | static ssize_t | |
3578 | min_sync_show(mddev_t *mddev, char *page) | |
3579 | { | |
3580 | return sprintf(page, "%llu\n", | |
3581 | (unsigned long long)mddev->resync_min); | |
3582 | } | |
3583 | static ssize_t | |
3584 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3585 | { | |
3586 | unsigned long long min; | |
3587 | if (strict_strtoull(buf, 10, &min)) | |
3588 | return -EINVAL; | |
3589 | if (min > mddev->resync_max) | |
3590 | return -EINVAL; | |
3591 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3592 | return -EBUSY; | |
3593 | ||
3594 | /* Must be a multiple of chunk_size */ | |
3595 | if (mddev->chunk_sectors) { | |
3596 | sector_t temp = min; | |
3597 | if (sector_div(temp, mddev->chunk_sectors)) | |
3598 | return -EINVAL; | |
3599 | } | |
3600 | mddev->resync_min = min; | |
3601 | ||
3602 | return len; | |
3603 | } | |
3604 | ||
3605 | static struct md_sysfs_entry md_min_sync = | |
3606 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3607 | ||
3608 | static ssize_t | |
3609 | max_sync_show(mddev_t *mddev, char *page) | |
3610 | { | |
3611 | if (mddev->resync_max == MaxSector) | |
3612 | return sprintf(page, "max\n"); | |
3613 | else | |
3614 | return sprintf(page, "%llu\n", | |
3615 | (unsigned long long)mddev->resync_max); | |
3616 | } | |
3617 | static ssize_t | |
3618 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3619 | { | |
3620 | if (strncmp(buf, "max", 3) == 0) | |
3621 | mddev->resync_max = MaxSector; | |
3622 | else { | |
3623 | unsigned long long max; | |
3624 | if (strict_strtoull(buf, 10, &max)) | |
3625 | return -EINVAL; | |
3626 | if (max < mddev->resync_min) | |
3627 | return -EINVAL; | |
3628 | if (max < mddev->resync_max && | |
3629 | mddev->ro == 0 && | |
3630 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3631 | return -EBUSY; | |
3632 | ||
3633 | /* Must be a multiple of chunk_size */ | |
3634 | if (mddev->chunk_sectors) { | |
3635 | sector_t temp = max; | |
3636 | if (sector_div(temp, mddev->chunk_sectors)) | |
3637 | return -EINVAL; | |
3638 | } | |
3639 | mddev->resync_max = max; | |
3640 | } | |
3641 | wake_up(&mddev->recovery_wait); | |
3642 | return len; | |
3643 | } | |
3644 | ||
3645 | static struct md_sysfs_entry md_max_sync = | |
3646 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3647 | ||
3648 | static ssize_t | |
3649 | suspend_lo_show(mddev_t *mddev, char *page) | |
3650 | { | |
3651 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3652 | } | |
3653 | ||
3654 | static ssize_t | |
3655 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3656 | { | |
3657 | char *e; | |
3658 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3659 | ||
3660 | if (mddev->pers == NULL || | |
3661 | mddev->pers->quiesce == NULL) | |
3662 | return -EINVAL; | |
3663 | if (buf == e || (*e && *e != '\n')) | |
3664 | return -EINVAL; | |
3665 | if (new >= mddev->suspend_hi || | |
3666 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3667 | mddev->suspend_lo = new; | |
3668 | mddev->pers->quiesce(mddev, 2); | |
3669 | return len; | |
3670 | } else | |
3671 | return -EINVAL; | |
3672 | } | |
3673 | static struct md_sysfs_entry md_suspend_lo = | |
3674 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3675 | ||
3676 | ||
3677 | static ssize_t | |
3678 | suspend_hi_show(mddev_t *mddev, char *page) | |
3679 | { | |
3680 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3681 | } | |
3682 | ||
3683 | static ssize_t | |
3684 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3685 | { | |
3686 | char *e; | |
3687 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3688 | ||
3689 | if (mddev->pers == NULL || | |
3690 | mddev->pers->quiesce == NULL) | |
3691 | return -EINVAL; | |
3692 | if (buf == e || (*e && *e != '\n')) | |
3693 | return -EINVAL; | |
3694 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3695 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3696 | mddev->suspend_hi = new; | |
3697 | mddev->pers->quiesce(mddev, 1); | |
3698 | mddev->pers->quiesce(mddev, 0); | |
3699 | return len; | |
3700 | } else | |
3701 | return -EINVAL; | |
3702 | } | |
3703 | static struct md_sysfs_entry md_suspend_hi = | |
3704 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3705 | ||
3706 | static ssize_t | |
3707 | reshape_position_show(mddev_t *mddev, char *page) | |
3708 | { | |
3709 | if (mddev->reshape_position != MaxSector) | |
3710 | return sprintf(page, "%llu\n", | |
3711 | (unsigned long long)mddev->reshape_position); | |
3712 | strcpy(page, "none\n"); | |
3713 | return 5; | |
3714 | } | |
3715 | ||
3716 | static ssize_t | |
3717 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3718 | { | |
3719 | char *e; | |
3720 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3721 | if (mddev->pers) | |
3722 | return -EBUSY; | |
3723 | if (buf == e || (*e && *e != '\n')) | |
3724 | return -EINVAL; | |
3725 | mddev->reshape_position = new; | |
3726 | mddev->delta_disks = 0; | |
3727 | mddev->new_level = mddev->level; | |
3728 | mddev->new_layout = mddev->layout; | |
3729 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
3730 | return len; | |
3731 | } | |
3732 | ||
3733 | static struct md_sysfs_entry md_reshape_position = | |
3734 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3735 | reshape_position_store); | |
3736 | ||
3737 | static ssize_t | |
3738 | array_size_show(mddev_t *mddev, char *page) | |
3739 | { | |
3740 | if (mddev->external_size) | |
3741 | return sprintf(page, "%llu\n", | |
3742 | (unsigned long long)mddev->array_sectors/2); | |
3743 | else | |
3744 | return sprintf(page, "default\n"); | |
3745 | } | |
3746 | ||
3747 | static ssize_t | |
3748 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3749 | { | |
3750 | sector_t sectors; | |
3751 | ||
3752 | if (strncmp(buf, "default", 7) == 0) { | |
3753 | if (mddev->pers) | |
3754 | sectors = mddev->pers->size(mddev, 0, 0); | |
3755 | else | |
3756 | sectors = mddev->array_sectors; | |
3757 | ||
3758 | mddev->external_size = 0; | |
3759 | } else { | |
3760 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
3761 | return -EINVAL; | |
3762 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
3763 | return -E2BIG; | |
3764 | ||
3765 | mddev->external_size = 1; | |
3766 | } | |
3767 | ||
3768 | mddev->array_sectors = sectors; | |
3769 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
3770 | if (mddev->pers) | |
3771 | revalidate_disk(mddev->gendisk); | |
3772 | ||
3773 | return len; | |
3774 | } | |
3775 | ||
3776 | static struct md_sysfs_entry md_array_size = | |
3777 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
3778 | array_size_store); | |
3779 | ||
3780 | static struct attribute *md_default_attrs[] = { | |
3781 | &md_level.attr, | |
3782 | &md_layout.attr, | |
3783 | &md_raid_disks.attr, | |
3784 | &md_chunk_size.attr, | |
3785 | &md_size.attr, | |
3786 | &md_resync_start.attr, | |
3787 | &md_metadata.attr, | |
3788 | &md_new_device.attr, | |
3789 | &md_safe_delay.attr, | |
3790 | &md_array_state.attr, | |
3791 | &md_reshape_position.attr, | |
3792 | &md_array_size.attr, | |
3793 | NULL, | |
3794 | }; | |
3795 | ||
3796 | static struct attribute *md_redundancy_attrs[] = { | |
3797 | &md_scan_mode.attr, | |
3798 | &md_mismatches.attr, | |
3799 | &md_sync_min.attr, | |
3800 | &md_sync_max.attr, | |
3801 | &md_sync_speed.attr, | |
3802 | &md_sync_force_parallel.attr, | |
3803 | &md_sync_completed.attr, | |
3804 | &md_min_sync.attr, | |
3805 | &md_max_sync.attr, | |
3806 | &md_suspend_lo.attr, | |
3807 | &md_suspend_hi.attr, | |
3808 | &md_bitmap.attr, | |
3809 | &md_degraded.attr, | |
3810 | NULL, | |
3811 | }; | |
3812 | static struct attribute_group md_redundancy_group = { | |
3813 | .name = NULL, | |
3814 | .attrs = md_redundancy_attrs, | |
3815 | }; | |
3816 | ||
3817 | ||
3818 | static ssize_t | |
3819 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3820 | { | |
3821 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3822 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
3823 | ssize_t rv; | |
3824 | ||
3825 | if (!entry->show) | |
3826 | return -EIO; | |
3827 | rv = mddev_lock(mddev); | |
3828 | if (!rv) { | |
3829 | rv = entry->show(mddev, page); | |
3830 | mddev_unlock(mddev); | |
3831 | } | |
3832 | return rv; | |
3833 | } | |
3834 | ||
3835 | static ssize_t | |
3836 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3837 | const char *page, size_t length) | |
3838 | { | |
3839 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3840 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
3841 | ssize_t rv; | |
3842 | ||
3843 | if (!entry->store) | |
3844 | return -EIO; | |
3845 | if (!capable(CAP_SYS_ADMIN)) | |
3846 | return -EACCES; | |
3847 | rv = mddev_lock(mddev); | |
3848 | if (mddev->hold_active == UNTIL_IOCTL) | |
3849 | mddev->hold_active = 0; | |
3850 | if (!rv) { | |
3851 | rv = entry->store(mddev, page, length); | |
3852 | mddev_unlock(mddev); | |
3853 | } | |
3854 | return rv; | |
3855 | } | |
3856 | ||
3857 | static void md_free(struct kobject *ko) | |
3858 | { | |
3859 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
3860 | ||
3861 | if (mddev->sysfs_state) | |
3862 | sysfs_put(mddev->sysfs_state); | |
3863 | ||
3864 | if (mddev->gendisk) { | |
3865 | del_gendisk(mddev->gendisk); | |
3866 | put_disk(mddev->gendisk); | |
3867 | } | |
3868 | if (mddev->queue) | |
3869 | blk_cleanup_queue(mddev->queue); | |
3870 | ||
3871 | kfree(mddev); | |
3872 | } | |
3873 | ||
3874 | static struct sysfs_ops md_sysfs_ops = { | |
3875 | .show = md_attr_show, | |
3876 | .store = md_attr_store, | |
3877 | }; | |
3878 | static struct kobj_type md_ktype = { | |
3879 | .release = md_free, | |
3880 | .sysfs_ops = &md_sysfs_ops, | |
3881 | .default_attrs = md_default_attrs, | |
3882 | }; | |
3883 | ||
3884 | int mdp_major = 0; | |
3885 | ||
3886 | static void mddev_delayed_delete(struct work_struct *ws) | |
3887 | { | |
3888 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
3889 | ||
3890 | if (mddev->private == &md_redundancy_group) { | |
3891 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
3892 | if (mddev->sysfs_action) | |
3893 | sysfs_put(mddev->sysfs_action); | |
3894 | mddev->sysfs_action = NULL; | |
3895 | mddev->private = NULL; | |
3896 | } | |
3897 | kobject_del(&mddev->kobj); | |
3898 | kobject_put(&mddev->kobj); | |
3899 | } | |
3900 | ||
3901 | static int md_alloc(dev_t dev, char *name) | |
3902 | { | |
3903 | static DEFINE_MUTEX(disks_mutex); | |
3904 | mddev_t *mddev = mddev_find(dev); | |
3905 | struct gendisk *disk; | |
3906 | int partitioned; | |
3907 | int shift; | |
3908 | int unit; | |
3909 | int error; | |
3910 | ||
3911 | if (!mddev) | |
3912 | return -ENODEV; | |
3913 | ||
3914 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
3915 | shift = partitioned ? MdpMinorShift : 0; | |
3916 | unit = MINOR(mddev->unit) >> shift; | |
3917 | ||
3918 | /* wait for any previous instance if this device | |
3919 | * to be completed removed (mddev_delayed_delete). | |
3920 | */ | |
3921 | flush_scheduled_work(); | |
3922 | ||
3923 | mutex_lock(&disks_mutex); | |
3924 | error = -EEXIST; | |
3925 | if (mddev->gendisk) | |
3926 | goto abort; | |
3927 | ||
3928 | if (name) { | |
3929 | /* Need to ensure that 'name' is not a duplicate. | |
3930 | */ | |
3931 | mddev_t *mddev2; | |
3932 | spin_lock(&all_mddevs_lock); | |
3933 | ||
3934 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
3935 | if (mddev2->gendisk && | |
3936 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
3937 | spin_unlock(&all_mddevs_lock); | |
3938 | goto abort; | |
3939 | } | |
3940 | spin_unlock(&all_mddevs_lock); | |
3941 | } | |
3942 | ||
3943 | error = -ENOMEM; | |
3944 | mddev->queue = blk_alloc_queue(GFP_KERNEL); | |
3945 | if (!mddev->queue) | |
3946 | goto abort; | |
3947 | mddev->queue->queuedata = mddev; | |
3948 | ||
3949 | /* Can be unlocked because the queue is new: no concurrency */ | |
3950 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
3951 | ||
3952 | blk_queue_make_request(mddev->queue, md_make_request); | |
3953 | ||
3954 | disk = alloc_disk(1 << shift); | |
3955 | if (!disk) { | |
3956 | blk_cleanup_queue(mddev->queue); | |
3957 | mddev->queue = NULL; | |
3958 | goto abort; | |
3959 | } | |
3960 | disk->major = MAJOR(mddev->unit); | |
3961 | disk->first_minor = unit << shift; | |
3962 | if (name) | |
3963 | strcpy(disk->disk_name, name); | |
3964 | else if (partitioned) | |
3965 | sprintf(disk->disk_name, "md_d%d", unit); | |
3966 | else | |
3967 | sprintf(disk->disk_name, "md%d", unit); | |
3968 | disk->fops = &md_fops; | |
3969 | disk->private_data = mddev; | |
3970 | disk->queue = mddev->queue; | |
3971 | /* Allow extended partitions. This makes the | |
3972 | * 'mdp' device redundant, but we can't really | |
3973 | * remove it now. | |
3974 | */ | |
3975 | disk->flags |= GENHD_FL_EXT_DEVT; | |
3976 | add_disk(disk); | |
3977 | mddev->gendisk = disk; | |
3978 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, | |
3979 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
3980 | if (error) { | |
3981 | /* This isn't possible, but as kobject_init_and_add is marked | |
3982 | * __must_check, we must do something with the result | |
3983 | */ | |
3984 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", | |
3985 | disk->disk_name); | |
3986 | error = 0; | |
3987 | } | |
3988 | abort: | |
3989 | mutex_unlock(&disks_mutex); | |
3990 | if (!error) { | |
3991 | kobject_uevent(&mddev->kobj, KOBJ_ADD); | |
3992 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); | |
3993 | } | |
3994 | mddev_put(mddev); | |
3995 | return error; | |
3996 | } | |
3997 | ||
3998 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
3999 | { | |
4000 | md_alloc(dev, NULL); | |
4001 | return NULL; | |
4002 | } | |
4003 | ||
4004 | static int add_named_array(const char *val, struct kernel_param *kp) | |
4005 | { | |
4006 | /* val must be "md_*" where * is not all digits. | |
4007 | * We allocate an array with a large free minor number, and | |
4008 | * set the name to val. val must not already be an active name. | |
4009 | */ | |
4010 | int len = strlen(val); | |
4011 | char buf[DISK_NAME_LEN]; | |
4012 | ||
4013 | while (len && val[len-1] == '\n') | |
4014 | len--; | |
4015 | if (len >= DISK_NAME_LEN) | |
4016 | return -E2BIG; | |
4017 | strlcpy(buf, val, len+1); | |
4018 | if (strncmp(buf, "md_", 3) != 0) | |
4019 | return -EINVAL; | |
4020 | return md_alloc(0, buf); | |
4021 | } | |
4022 | ||
4023 | static void md_safemode_timeout(unsigned long data) | |
4024 | { | |
4025 | mddev_t *mddev = (mddev_t *) data; | |
4026 | ||
4027 | if (!atomic_read(&mddev->writes_pending)) { | |
4028 | mddev->safemode = 1; | |
4029 | if (mddev->external) | |
4030 | sysfs_notify_dirent(mddev->sysfs_state); | |
4031 | } | |
4032 | md_wakeup_thread(mddev->thread); | |
4033 | } | |
4034 | ||
4035 | static int start_dirty_degraded; | |
4036 | ||
4037 | static int do_md_run(mddev_t * mddev) | |
4038 | { | |
4039 | int err; | |
4040 | mdk_rdev_t *rdev; | |
4041 | struct gendisk *disk; | |
4042 | struct mdk_personality *pers; | |
4043 | ||
4044 | if (list_empty(&mddev->disks)) | |
4045 | /* cannot run an array with no devices.. */ | |
4046 | return -EINVAL; | |
4047 | ||
4048 | if (mddev->pers) | |
4049 | return -EBUSY; | |
4050 | ||
4051 | /* | |
4052 | * Analyze all RAID superblock(s) | |
4053 | */ | |
4054 | if (!mddev->raid_disks) { | |
4055 | if (!mddev->persistent) | |
4056 | return -EINVAL; | |
4057 | analyze_sbs(mddev); | |
4058 | } | |
4059 | ||
4060 | if (mddev->level != LEVEL_NONE) | |
4061 | request_module("md-level-%d", mddev->level); | |
4062 | else if (mddev->clevel[0]) | |
4063 | request_module("md-%s", mddev->clevel); | |
4064 | ||
4065 | /* | |
4066 | * Drop all container device buffers, from now on | |
4067 | * the only valid external interface is through the md | |
4068 | * device. | |
4069 | */ | |
4070 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
4071 | if (test_bit(Faulty, &rdev->flags)) | |
4072 | continue; | |
4073 | sync_blockdev(rdev->bdev); | |
4074 | invalidate_bdev(rdev->bdev); | |
4075 | ||
4076 | /* perform some consistency tests on the device. | |
4077 | * We don't want the data to overlap the metadata, | |
4078 | * Internal Bitmap issues have been handled elsewhere. | |
4079 | */ | |
4080 | if (rdev->data_offset < rdev->sb_start) { | |
4081 | if (mddev->dev_sectors && | |
4082 | rdev->data_offset + mddev->dev_sectors | |
4083 | > rdev->sb_start) { | |
4084 | printk("md: %s: data overlaps metadata\n", | |
4085 | mdname(mddev)); | |
4086 | return -EINVAL; | |
4087 | } | |
4088 | } else { | |
4089 | if (rdev->sb_start + rdev->sb_size/512 | |
4090 | > rdev->data_offset) { | |
4091 | printk("md: %s: metadata overlaps data\n", | |
4092 | mdname(mddev)); | |
4093 | return -EINVAL; | |
4094 | } | |
4095 | } | |
4096 | sysfs_notify_dirent(rdev->sysfs_state); | |
4097 | } | |
4098 | ||
4099 | md_probe(mddev->unit, NULL, NULL); | |
4100 | disk = mddev->gendisk; | |
4101 | if (!disk) | |
4102 | return -ENOMEM; | |
4103 | ||
4104 | spin_lock(&pers_lock); | |
4105 | pers = find_pers(mddev->level, mddev->clevel); | |
4106 | if (!pers || !try_module_get(pers->owner)) { | |
4107 | spin_unlock(&pers_lock); | |
4108 | if (mddev->level != LEVEL_NONE) | |
4109 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4110 | mddev->level); | |
4111 | else | |
4112 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4113 | mddev->clevel); | |
4114 | return -EINVAL; | |
4115 | } | |
4116 | mddev->pers = pers; | |
4117 | spin_unlock(&pers_lock); | |
4118 | if (mddev->level != pers->level) { | |
4119 | mddev->level = pers->level; | |
4120 | mddev->new_level = pers->level; | |
4121 | } | |
4122 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
4123 | ||
4124 | if (mddev->reshape_position != MaxSector && | |
4125 | pers->start_reshape == NULL) { | |
4126 | /* This personality cannot handle reshaping... */ | |
4127 | mddev->pers = NULL; | |
4128 | module_put(pers->owner); | |
4129 | return -EINVAL; | |
4130 | } | |
4131 | ||
4132 | if (pers->sync_request) { | |
4133 | /* Warn if this is a potentially silly | |
4134 | * configuration. | |
4135 | */ | |
4136 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4137 | mdk_rdev_t *rdev2; | |
4138 | int warned = 0; | |
4139 | ||
4140 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4141 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
4142 | if (rdev < rdev2 && | |
4143 | rdev->bdev->bd_contains == | |
4144 | rdev2->bdev->bd_contains) { | |
4145 | printk(KERN_WARNING | |
4146 | "%s: WARNING: %s appears to be" | |
4147 | " on the same physical disk as" | |
4148 | " %s.\n", | |
4149 | mdname(mddev), | |
4150 | bdevname(rdev->bdev,b), | |
4151 | bdevname(rdev2->bdev,b2)); | |
4152 | warned = 1; | |
4153 | } | |
4154 | } | |
4155 | ||
4156 | if (warned) | |
4157 | printk(KERN_WARNING | |
4158 | "True protection against single-disk" | |
4159 | " failure might be compromised.\n"); | |
4160 | } | |
4161 | ||
4162 | mddev->recovery = 0; | |
4163 | /* may be over-ridden by personality */ | |
4164 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4165 | ||
4166 | mddev->barriers_work = 1; | |
4167 | mddev->ok_start_degraded = start_dirty_degraded; | |
4168 | ||
4169 | if (start_readonly) | |
4170 | mddev->ro = 2; /* read-only, but switch on first write */ | |
4171 | ||
4172 | err = mddev->pers->run(mddev); | |
4173 | if (err) | |
4174 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
4175 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { | |
4176 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4177 | " but 'external_size' not in effect?\n", __func__); | |
4178 | printk(KERN_ERR | |
4179 | "md: invalid array_size %llu > default size %llu\n", | |
4180 | (unsigned long long)mddev->array_sectors / 2, | |
4181 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4182 | err = -EINVAL; | |
4183 | mddev->pers->stop(mddev); | |
4184 | } | |
4185 | if (err == 0 && mddev->pers->sync_request) { | |
4186 | err = bitmap_create(mddev); | |
4187 | if (err) { | |
4188 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4189 | mdname(mddev), err); | |
4190 | mddev->pers->stop(mddev); | |
4191 | } | |
4192 | } | |
4193 | if (err) { | |
4194 | module_put(mddev->pers->owner); | |
4195 | mddev->pers = NULL; | |
4196 | bitmap_destroy(mddev); | |
4197 | return err; | |
4198 | } | |
4199 | if (mddev->pers->sync_request) { | |
4200 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
4201 | printk(KERN_WARNING | |
4202 | "md: cannot register extra attributes for %s\n", | |
4203 | mdname(mddev)); | |
4204 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); | |
4205 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ | |
4206 | mddev->ro = 0; | |
4207 | ||
4208 | atomic_set(&mddev->writes_pending,0); | |
4209 | mddev->safemode = 0; | |
4210 | mddev->safemode_timer.function = md_safemode_timeout; | |
4211 | mddev->safemode_timer.data = (unsigned long) mddev; | |
4212 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ | |
4213 | mddev->in_sync = 1; | |
4214 | ||
4215 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4216 | if (rdev->raid_disk >= 0) { | |
4217 | char nm[20]; | |
4218 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4219 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) | |
4220 | printk("md: cannot register %s for %s\n", | |
4221 | nm, mdname(mddev)); | |
4222 | } | |
4223 | ||
4224 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4225 | ||
4226 | if (mddev->flags) | |
4227 | md_update_sb(mddev, 0); | |
4228 | ||
4229 | set_capacity(disk, mddev->array_sectors); | |
4230 | ||
4231 | /* If there is a partially-recovered drive we need to | |
4232 | * start recovery here. If we leave it to md_check_recovery, | |
4233 | * it will remove the drives and not do the right thing | |
4234 | */ | |
4235 | if (mddev->degraded && !mddev->sync_thread) { | |
4236 | int spares = 0; | |
4237 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4238 | if (rdev->raid_disk >= 0 && | |
4239 | !test_bit(In_sync, &rdev->flags) && | |
4240 | !test_bit(Faulty, &rdev->flags)) | |
4241 | /* complete an interrupted recovery */ | |
4242 | spares++; | |
4243 | if (spares && mddev->pers->sync_request) { | |
4244 | mddev->recovery = 0; | |
4245 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4246 | mddev->sync_thread = md_register_thread(md_do_sync, | |
4247 | mddev, | |
4248 | "resync"); | |
4249 | if (!mddev->sync_thread) { | |
4250 | printk(KERN_ERR "%s: could not start resync" | |
4251 | " thread...\n", | |
4252 | mdname(mddev)); | |
4253 | /* leave the spares where they are, it shouldn't hurt */ | |
4254 | mddev->recovery = 0; | |
4255 | } | |
4256 | } | |
4257 | } | |
4258 | md_wakeup_thread(mddev->thread); | |
4259 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
4260 | ||
4261 | revalidate_disk(mddev->gendisk); | |
4262 | mddev->changed = 1; | |
4263 | md_new_event(mddev); | |
4264 | sysfs_notify_dirent(mddev->sysfs_state); | |
4265 | if (mddev->sysfs_action) | |
4266 | sysfs_notify_dirent(mddev->sysfs_action); | |
4267 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
4268 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); | |
4269 | return 0; | |
4270 | } | |
4271 | ||
4272 | static int restart_array(mddev_t *mddev) | |
4273 | { | |
4274 | struct gendisk *disk = mddev->gendisk; | |
4275 | ||
4276 | /* Complain if it has no devices */ | |
4277 | if (list_empty(&mddev->disks)) | |
4278 | return -ENXIO; | |
4279 | if (!mddev->pers) | |
4280 | return -EINVAL; | |
4281 | if (!mddev->ro) | |
4282 | return -EBUSY; | |
4283 | mddev->safemode = 0; | |
4284 | mddev->ro = 0; | |
4285 | set_disk_ro(disk, 0); | |
4286 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4287 | mdname(mddev)); | |
4288 | /* Kick recovery or resync if necessary */ | |
4289 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4290 | md_wakeup_thread(mddev->thread); | |
4291 | md_wakeup_thread(mddev->sync_thread); | |
4292 | sysfs_notify_dirent(mddev->sysfs_state); | |
4293 | return 0; | |
4294 | } | |
4295 | ||
4296 | /* similar to deny_write_access, but accounts for our holding a reference | |
4297 | * to the file ourselves */ | |
4298 | static int deny_bitmap_write_access(struct file * file) | |
4299 | { | |
4300 | struct inode *inode = file->f_mapping->host; | |
4301 | ||
4302 | spin_lock(&inode->i_lock); | |
4303 | if (atomic_read(&inode->i_writecount) > 1) { | |
4304 | spin_unlock(&inode->i_lock); | |
4305 | return -ETXTBSY; | |
4306 | } | |
4307 | atomic_set(&inode->i_writecount, -1); | |
4308 | spin_unlock(&inode->i_lock); | |
4309 | ||
4310 | return 0; | |
4311 | } | |
4312 | ||
4313 | static void restore_bitmap_write_access(struct file *file) | |
4314 | { | |
4315 | struct inode *inode = file->f_mapping->host; | |
4316 | ||
4317 | spin_lock(&inode->i_lock); | |
4318 | atomic_set(&inode->i_writecount, 1); | |
4319 | spin_unlock(&inode->i_lock); | |
4320 | } | |
4321 | ||
4322 | /* mode: | |
4323 | * 0 - completely stop and dis-assemble array | |
4324 | * 1 - switch to readonly | |
4325 | * 2 - stop but do not disassemble array | |
4326 | */ | |
4327 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) | |
4328 | { | |
4329 | int err = 0; | |
4330 | struct gendisk *disk = mddev->gendisk; | |
4331 | mdk_rdev_t *rdev; | |
4332 | ||
4333 | mutex_lock(&mddev->open_mutex); | |
4334 | if (atomic_read(&mddev->openers) > is_open) { | |
4335 | printk("md: %s still in use.\n",mdname(mddev)); | |
4336 | err = -EBUSY; | |
4337 | } else if (mddev->pers) { | |
4338 | ||
4339 | if (mddev->sync_thread) { | |
4340 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4341 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4342 | md_unregister_thread(mddev->sync_thread); | |
4343 | mddev->sync_thread = NULL; | |
4344 | } | |
4345 | ||
4346 | del_timer_sync(&mddev->safemode_timer); | |
4347 | ||
4348 | switch(mode) { | |
4349 | case 1: /* readonly */ | |
4350 | err = -ENXIO; | |
4351 | if (mddev->ro==1) | |
4352 | goto out; | |
4353 | mddev->ro = 1; | |
4354 | break; | |
4355 | case 0: /* disassemble */ | |
4356 | case 2: /* stop */ | |
4357 | bitmap_flush(mddev); | |
4358 | md_super_wait(mddev); | |
4359 | if (mddev->ro) | |
4360 | set_disk_ro(disk, 0); | |
4361 | ||
4362 | mddev->pers->stop(mddev); | |
4363 | mddev->queue->merge_bvec_fn = NULL; | |
4364 | mddev->queue->unplug_fn = NULL; | |
4365 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
4366 | module_put(mddev->pers->owner); | |
4367 | if (mddev->pers->sync_request) | |
4368 | mddev->private = &md_redundancy_group; | |
4369 | mddev->pers = NULL; | |
4370 | /* tell userspace to handle 'inactive' */ | |
4371 | sysfs_notify_dirent(mddev->sysfs_state); | |
4372 | ||
4373 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4374 | if (rdev->raid_disk >= 0) { | |
4375 | char nm[20]; | |
4376 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4377 | sysfs_remove_link(&mddev->kobj, nm); | |
4378 | } | |
4379 | ||
4380 | set_capacity(disk, 0); | |
4381 | mddev->changed = 1; | |
4382 | ||
4383 | if (mddev->ro) | |
4384 | mddev->ro = 0; | |
4385 | } | |
4386 | if (!mddev->in_sync || mddev->flags) { | |
4387 | /* mark array as shutdown cleanly */ | |
4388 | mddev->in_sync = 1; | |
4389 | md_update_sb(mddev, 1); | |
4390 | } | |
4391 | if (mode == 1) | |
4392 | set_disk_ro(disk, 1); | |
4393 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4394 | err = 0; | |
4395 | } | |
4396 | out: | |
4397 | mutex_unlock(&mddev->open_mutex); | |
4398 | if (err) | |
4399 | return err; | |
4400 | /* | |
4401 | * Free resources if final stop | |
4402 | */ | |
4403 | if (mode == 0) { | |
4404 | ||
4405 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); | |
4406 | ||
4407 | bitmap_destroy(mddev); | |
4408 | if (mddev->bitmap_file) { | |
4409 | restore_bitmap_write_access(mddev->bitmap_file); | |
4410 | fput(mddev->bitmap_file); | |
4411 | mddev->bitmap_file = NULL; | |
4412 | } | |
4413 | mddev->bitmap_offset = 0; | |
4414 | ||
4415 | /* make sure all md_delayed_delete calls have finished */ | |
4416 | flush_scheduled_work(); | |
4417 | ||
4418 | export_array(mddev); | |
4419 | ||
4420 | mddev->array_sectors = 0; | |
4421 | mddev->external_size = 0; | |
4422 | mddev->dev_sectors = 0; | |
4423 | mddev->raid_disks = 0; | |
4424 | mddev->recovery_cp = 0; | |
4425 | mddev->resync_min = 0; | |
4426 | mddev->resync_max = MaxSector; | |
4427 | mddev->reshape_position = MaxSector; | |
4428 | mddev->external = 0; | |
4429 | mddev->persistent = 0; | |
4430 | mddev->level = LEVEL_NONE; | |
4431 | mddev->clevel[0] = 0; | |
4432 | mddev->flags = 0; | |
4433 | mddev->ro = 0; | |
4434 | mddev->metadata_type[0] = 0; | |
4435 | mddev->chunk_sectors = 0; | |
4436 | mddev->ctime = mddev->utime = 0; | |
4437 | mddev->layout = 0; | |
4438 | mddev->max_disks = 0; | |
4439 | mddev->events = 0; | |
4440 | mddev->delta_disks = 0; | |
4441 | mddev->new_level = LEVEL_NONE; | |
4442 | mddev->new_layout = 0; | |
4443 | mddev->new_chunk_sectors = 0; | |
4444 | mddev->curr_resync = 0; | |
4445 | mddev->resync_mismatches = 0; | |
4446 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4447 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4448 | mddev->recovery = 0; | |
4449 | mddev->in_sync = 0; | |
4450 | mddev->changed = 0; | |
4451 | mddev->degraded = 0; | |
4452 | mddev->barriers_work = 0; | |
4453 | mddev->safemode = 0; | |
4454 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); | |
4455 | if (mddev->hold_active == UNTIL_STOP) | |
4456 | mddev->hold_active = 0; | |
4457 | ||
4458 | } else if (mddev->pers) | |
4459 | printk(KERN_INFO "md: %s switched to read-only mode.\n", | |
4460 | mdname(mddev)); | |
4461 | err = 0; | |
4462 | blk_integrity_unregister(disk); | |
4463 | md_new_event(mddev); | |
4464 | sysfs_notify_dirent(mddev->sysfs_state); | |
4465 | return err; | |
4466 | } | |
4467 | ||
4468 | #ifndef MODULE | |
4469 | static void autorun_array(mddev_t *mddev) | |
4470 | { | |
4471 | mdk_rdev_t *rdev; | |
4472 | int err; | |
4473 | ||
4474 | if (list_empty(&mddev->disks)) | |
4475 | return; | |
4476 | ||
4477 | printk(KERN_INFO "md: running: "); | |
4478 | ||
4479 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
4480 | char b[BDEVNAME_SIZE]; | |
4481 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4482 | } | |
4483 | printk("\n"); | |
4484 | ||
4485 | err = do_md_run(mddev); | |
4486 | if (err) { | |
4487 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
4488 | do_md_stop(mddev, 0, 0); | |
4489 | } | |
4490 | } | |
4491 | ||
4492 | /* | |
4493 | * lets try to run arrays based on all disks that have arrived | |
4494 | * until now. (those are in pending_raid_disks) | |
4495 | * | |
4496 | * the method: pick the first pending disk, collect all disks with | |
4497 | * the same UUID, remove all from the pending list and put them into | |
4498 | * the 'same_array' list. Then order this list based on superblock | |
4499 | * update time (freshest comes first), kick out 'old' disks and | |
4500 | * compare superblocks. If everything's fine then run it. | |
4501 | * | |
4502 | * If "unit" is allocated, then bump its reference count | |
4503 | */ | |
4504 | static void autorun_devices(int part) | |
4505 | { | |
4506 | mdk_rdev_t *rdev0, *rdev, *tmp; | |
4507 | mddev_t *mddev; | |
4508 | char b[BDEVNAME_SIZE]; | |
4509 | ||
4510 | printk(KERN_INFO "md: autorun ...\n"); | |
4511 | while (!list_empty(&pending_raid_disks)) { | |
4512 | int unit; | |
4513 | dev_t dev; | |
4514 | LIST_HEAD(candidates); | |
4515 | rdev0 = list_entry(pending_raid_disks.next, | |
4516 | mdk_rdev_t, same_set); | |
4517 | ||
4518 | printk(KERN_INFO "md: considering %s ...\n", | |
4519 | bdevname(rdev0->bdev,b)); | |
4520 | INIT_LIST_HEAD(&candidates); | |
4521 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) | |
4522 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
4523 | printk(KERN_INFO "md: adding %s ...\n", | |
4524 | bdevname(rdev->bdev,b)); | |
4525 | list_move(&rdev->same_set, &candidates); | |
4526 | } | |
4527 | /* | |
4528 | * now we have a set of devices, with all of them having | |
4529 | * mostly sane superblocks. It's time to allocate the | |
4530 | * mddev. | |
4531 | */ | |
4532 | if (part) { | |
4533 | dev = MKDEV(mdp_major, | |
4534 | rdev0->preferred_minor << MdpMinorShift); | |
4535 | unit = MINOR(dev) >> MdpMinorShift; | |
4536 | } else { | |
4537 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4538 | unit = MINOR(dev); | |
4539 | } | |
4540 | if (rdev0->preferred_minor != unit) { | |
4541 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", | |
4542 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4543 | break; | |
4544 | } | |
4545 | ||
4546 | md_probe(dev, NULL, NULL); | |
4547 | mddev = mddev_find(dev); | |
4548 | if (!mddev || !mddev->gendisk) { | |
4549 | if (mddev) | |
4550 | mddev_put(mddev); | |
4551 | printk(KERN_ERR | |
4552 | "md: cannot allocate memory for md drive.\n"); | |
4553 | break; | |
4554 | } | |
4555 | if (mddev_lock(mddev)) | |
4556 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4557 | mdname(mddev)); | |
4558 | else if (mddev->raid_disks || mddev->major_version | |
4559 | || !list_empty(&mddev->disks)) { | |
4560 | printk(KERN_WARNING | |
4561 | "md: %s already running, cannot run %s\n", | |
4562 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4563 | mddev_unlock(mddev); | |
4564 | } else { | |
4565 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
4566 | mddev->persistent = 1; | |
4567 | rdev_for_each_list(rdev, tmp, &candidates) { | |
4568 | list_del_init(&rdev->same_set); | |
4569 | if (bind_rdev_to_array(rdev, mddev)) | |
4570 | export_rdev(rdev); | |
4571 | } | |
4572 | autorun_array(mddev); | |
4573 | mddev_unlock(mddev); | |
4574 | } | |
4575 | /* on success, candidates will be empty, on error | |
4576 | * it won't... | |
4577 | */ | |
4578 | rdev_for_each_list(rdev, tmp, &candidates) { | |
4579 | list_del_init(&rdev->same_set); | |
4580 | export_rdev(rdev); | |
4581 | } | |
4582 | mddev_put(mddev); | |
4583 | } | |
4584 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4585 | } | |
4586 | #endif /* !MODULE */ | |
4587 | ||
4588 | static int get_version(void __user * arg) | |
4589 | { | |
4590 | mdu_version_t ver; | |
4591 | ||
4592 | ver.major = MD_MAJOR_VERSION; | |
4593 | ver.minor = MD_MINOR_VERSION; | |
4594 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4595 | ||
4596 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4597 | return -EFAULT; | |
4598 | ||
4599 | return 0; | |
4600 | } | |
4601 | ||
4602 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4603 | { | |
4604 | mdu_array_info_t info; | |
4605 | int nr,working,insync,failed,spare; | |
4606 | mdk_rdev_t *rdev; | |
4607 | ||
4608 | nr=working=insync=failed=spare=0; | |
4609 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
4610 | nr++; | |
4611 | if (test_bit(Faulty, &rdev->flags)) | |
4612 | failed++; | |
4613 | else { | |
4614 | working++; | |
4615 | if (test_bit(In_sync, &rdev->flags)) | |
4616 | insync++; | |
4617 | else | |
4618 | spare++; | |
4619 | } | |
4620 | } | |
4621 | ||
4622 | info.major_version = mddev->major_version; | |
4623 | info.minor_version = mddev->minor_version; | |
4624 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4625 | info.ctime = mddev->ctime; | |
4626 | info.level = mddev->level; | |
4627 | info.size = mddev->dev_sectors / 2; | |
4628 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
4629 | info.size = -1; | |
4630 | info.nr_disks = nr; | |
4631 | info.raid_disks = mddev->raid_disks; | |
4632 | info.md_minor = mddev->md_minor; | |
4633 | info.not_persistent= !mddev->persistent; | |
4634 | ||
4635 | info.utime = mddev->utime; | |
4636 | info.state = 0; | |
4637 | if (mddev->in_sync) | |
4638 | info.state = (1<<MD_SB_CLEAN); | |
4639 | if (mddev->bitmap && mddev->bitmap_offset) | |
4640 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
4641 | info.active_disks = insync; | |
4642 | info.working_disks = working; | |
4643 | info.failed_disks = failed; | |
4644 | info.spare_disks = spare; | |
4645 | ||
4646 | info.layout = mddev->layout; | |
4647 | info.chunk_size = mddev->chunk_sectors << 9; | |
4648 | ||
4649 | if (copy_to_user(arg, &info, sizeof(info))) | |
4650 | return -EFAULT; | |
4651 | ||
4652 | return 0; | |
4653 | } | |
4654 | ||
4655 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) | |
4656 | { | |
4657 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4658 | char *ptr, *buf = NULL; | |
4659 | int err = -ENOMEM; | |
4660 | ||
4661 | if (md_allow_write(mddev)) | |
4662 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4663 | else | |
4664 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
4665 | ||
4666 | if (!file) | |
4667 | goto out; | |
4668 | ||
4669 | /* bitmap disabled, zero the first byte and copy out */ | |
4670 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4671 | file->pathname[0] = '\0'; | |
4672 | goto copy_out; | |
4673 | } | |
4674 | ||
4675 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4676 | if (!buf) | |
4677 | goto out; | |
4678 | ||
4679 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); | |
4680 | if (IS_ERR(ptr)) | |
4681 | goto out; | |
4682 | ||
4683 | strcpy(file->pathname, ptr); | |
4684 | ||
4685 | copy_out: | |
4686 | err = 0; | |
4687 | if (copy_to_user(arg, file, sizeof(*file))) | |
4688 | err = -EFAULT; | |
4689 | out: | |
4690 | kfree(buf); | |
4691 | kfree(file); | |
4692 | return err; | |
4693 | } | |
4694 | ||
4695 | static int get_disk_info(mddev_t * mddev, void __user * arg) | |
4696 | { | |
4697 | mdu_disk_info_t info; | |
4698 | mdk_rdev_t *rdev; | |
4699 | ||
4700 | if (copy_from_user(&info, arg, sizeof(info))) | |
4701 | return -EFAULT; | |
4702 | ||
4703 | rdev = find_rdev_nr(mddev, info.number); | |
4704 | if (rdev) { | |
4705 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4706 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4707 | info.raid_disk = rdev->raid_disk; | |
4708 | info.state = 0; | |
4709 | if (test_bit(Faulty, &rdev->flags)) | |
4710 | info.state |= (1<<MD_DISK_FAULTY); | |
4711 | else if (test_bit(In_sync, &rdev->flags)) { | |
4712 | info.state |= (1<<MD_DISK_ACTIVE); | |
4713 | info.state |= (1<<MD_DISK_SYNC); | |
4714 | } | |
4715 | if (test_bit(WriteMostly, &rdev->flags)) | |
4716 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
4717 | } else { | |
4718 | info.major = info.minor = 0; | |
4719 | info.raid_disk = -1; | |
4720 | info.state = (1<<MD_DISK_REMOVED); | |
4721 | } | |
4722 | ||
4723 | if (copy_to_user(arg, &info, sizeof(info))) | |
4724 | return -EFAULT; | |
4725 | ||
4726 | return 0; | |
4727 | } | |
4728 | ||
4729 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4730 | { | |
4731 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4732 | mdk_rdev_t *rdev; | |
4733 | dev_t dev = MKDEV(info->major,info->minor); | |
4734 | ||
4735 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4736 | return -EOVERFLOW; | |
4737 | ||
4738 | if (!mddev->raid_disks) { | |
4739 | int err; | |
4740 | /* expecting a device which has a superblock */ | |
4741 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4742 | if (IS_ERR(rdev)) { | |
4743 | printk(KERN_WARNING | |
4744 | "md: md_import_device returned %ld\n", | |
4745 | PTR_ERR(rdev)); | |
4746 | return PTR_ERR(rdev); | |
4747 | } | |
4748 | if (!list_empty(&mddev->disks)) { | |
4749 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4750 | mdk_rdev_t, same_set); | |
4751 | err = super_types[mddev->major_version] | |
4752 | .load_super(rdev, rdev0, mddev->minor_version); | |
4753 | if (err < 0) { | |
4754 | printk(KERN_WARNING | |
4755 | "md: %s has different UUID to %s\n", | |
4756 | bdevname(rdev->bdev,b), | |
4757 | bdevname(rdev0->bdev,b2)); | |
4758 | export_rdev(rdev); | |
4759 | return -EINVAL; | |
4760 | } | |
4761 | } | |
4762 | err = bind_rdev_to_array(rdev, mddev); | |
4763 | if (err) | |
4764 | export_rdev(rdev); | |
4765 | return err; | |
4766 | } | |
4767 | ||
4768 | /* | |
4769 | * add_new_disk can be used once the array is assembled | |
4770 | * to add "hot spares". They must already have a superblock | |
4771 | * written | |
4772 | */ | |
4773 | if (mddev->pers) { | |
4774 | int err; | |
4775 | if (!mddev->pers->hot_add_disk) { | |
4776 | printk(KERN_WARNING | |
4777 | "%s: personality does not support diskops!\n", | |
4778 | mdname(mddev)); | |
4779 | return -EINVAL; | |
4780 | } | |
4781 | if (mddev->persistent) | |
4782 | rdev = md_import_device(dev, mddev->major_version, | |
4783 | mddev->minor_version); | |
4784 | else | |
4785 | rdev = md_import_device(dev, -1, -1); | |
4786 | if (IS_ERR(rdev)) { | |
4787 | printk(KERN_WARNING | |
4788 | "md: md_import_device returned %ld\n", | |
4789 | PTR_ERR(rdev)); | |
4790 | return PTR_ERR(rdev); | |
4791 | } | |
4792 | /* set save_raid_disk if appropriate */ | |
4793 | if (!mddev->persistent) { | |
4794 | if (info->state & (1<<MD_DISK_SYNC) && | |
4795 | info->raid_disk < mddev->raid_disks) | |
4796 | rdev->raid_disk = info->raid_disk; | |
4797 | else | |
4798 | rdev->raid_disk = -1; | |
4799 | } else | |
4800 | super_types[mddev->major_version]. | |
4801 | validate_super(mddev, rdev); | |
4802 | rdev->saved_raid_disk = rdev->raid_disk; | |
4803 | ||
4804 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ | |
4805 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) | |
4806 | set_bit(WriteMostly, &rdev->flags); | |
4807 | else | |
4808 | clear_bit(WriteMostly, &rdev->flags); | |
4809 | ||
4810 | rdev->raid_disk = -1; | |
4811 | err = bind_rdev_to_array(rdev, mddev); | |
4812 | if (!err && !mddev->pers->hot_remove_disk) { | |
4813 | /* If there is hot_add_disk but no hot_remove_disk | |
4814 | * then added disks for geometry changes, | |
4815 | * and should be added immediately. | |
4816 | */ | |
4817 | super_types[mddev->major_version]. | |
4818 | validate_super(mddev, rdev); | |
4819 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4820 | if (err) | |
4821 | unbind_rdev_from_array(rdev); | |
4822 | } | |
4823 | if (err) | |
4824 | export_rdev(rdev); | |
4825 | else | |
4826 | sysfs_notify_dirent(rdev->sysfs_state); | |
4827 | ||
4828 | md_update_sb(mddev, 1); | |
4829 | if (mddev->degraded) | |
4830 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
4831 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4832 | md_wakeup_thread(mddev->thread); | |
4833 | return err; | |
4834 | } | |
4835 | ||
4836 | /* otherwise, add_new_disk is only allowed | |
4837 | * for major_version==0 superblocks | |
4838 | */ | |
4839 | if (mddev->major_version != 0) { | |
4840 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
4841 | mdname(mddev)); | |
4842 | return -EINVAL; | |
4843 | } | |
4844 | ||
4845 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
4846 | int err; | |
4847 | rdev = md_import_device(dev, -1, 0); | |
4848 | if (IS_ERR(rdev)) { | |
4849 | printk(KERN_WARNING | |
4850 | "md: error, md_import_device() returned %ld\n", | |
4851 | PTR_ERR(rdev)); | |
4852 | return PTR_ERR(rdev); | |
4853 | } | |
4854 | rdev->desc_nr = info->number; | |
4855 | if (info->raid_disk < mddev->raid_disks) | |
4856 | rdev->raid_disk = info->raid_disk; | |
4857 | else | |
4858 | rdev->raid_disk = -1; | |
4859 | ||
4860 | if (rdev->raid_disk < mddev->raid_disks) | |
4861 | if (info->state & (1<<MD_DISK_SYNC)) | |
4862 | set_bit(In_sync, &rdev->flags); | |
4863 | ||
4864 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) | |
4865 | set_bit(WriteMostly, &rdev->flags); | |
4866 | ||
4867 | if (!mddev->persistent) { | |
4868 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
4869 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; | |
4870 | } else | |
4871 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); | |
4872 | rdev->sectors = rdev->sb_start; | |
4873 | ||
4874 | err = bind_rdev_to_array(rdev, mddev); | |
4875 | if (err) { | |
4876 | export_rdev(rdev); | |
4877 | return err; | |
4878 | } | |
4879 | } | |
4880 | ||
4881 | return 0; | |
4882 | } | |
4883 | ||
4884 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
4885 | { | |
4886 | char b[BDEVNAME_SIZE]; | |
4887 | mdk_rdev_t *rdev; | |
4888 | ||
4889 | rdev = find_rdev(mddev, dev); | |
4890 | if (!rdev) | |
4891 | return -ENXIO; | |
4892 | ||
4893 | if (rdev->raid_disk >= 0) | |
4894 | goto busy; | |
4895 | ||
4896 | kick_rdev_from_array(rdev); | |
4897 | md_update_sb(mddev, 1); | |
4898 | md_new_event(mddev); | |
4899 | ||
4900 | return 0; | |
4901 | busy: | |
4902 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", | |
4903 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4904 | return -EBUSY; | |
4905 | } | |
4906 | ||
4907 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
4908 | { | |
4909 | char b[BDEVNAME_SIZE]; | |
4910 | int err; | |
4911 | mdk_rdev_t *rdev; | |
4912 | ||
4913 | if (!mddev->pers) | |
4914 | return -ENODEV; | |
4915 | ||
4916 | if (mddev->major_version != 0) { | |
4917 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
4918 | " version-0 superblocks.\n", | |
4919 | mdname(mddev)); | |
4920 | return -EINVAL; | |
4921 | } | |
4922 | if (!mddev->pers->hot_add_disk) { | |
4923 | printk(KERN_WARNING | |
4924 | "%s: personality does not support diskops!\n", | |
4925 | mdname(mddev)); | |
4926 | return -EINVAL; | |
4927 | } | |
4928 | ||
4929 | rdev = md_import_device(dev, -1, 0); | |
4930 | if (IS_ERR(rdev)) { | |
4931 | printk(KERN_WARNING | |
4932 | "md: error, md_import_device() returned %ld\n", | |
4933 | PTR_ERR(rdev)); | |
4934 | return -EINVAL; | |
4935 | } | |
4936 | ||
4937 | if (mddev->persistent) | |
4938 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); | |
4939 | else | |
4940 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; | |
4941 | ||
4942 | rdev->sectors = rdev->sb_start; | |
4943 | ||
4944 | if (test_bit(Faulty, &rdev->flags)) { | |
4945 | printk(KERN_WARNING | |
4946 | "md: can not hot-add faulty %s disk to %s!\n", | |
4947 | bdevname(rdev->bdev,b), mdname(mddev)); | |
4948 | err = -EINVAL; | |
4949 | goto abort_export; | |
4950 | } | |
4951 | clear_bit(In_sync, &rdev->flags); | |
4952 | rdev->desc_nr = -1; | |
4953 | rdev->saved_raid_disk = -1; | |
4954 | err = bind_rdev_to_array(rdev, mddev); | |
4955 | if (err) | |
4956 | goto abort_export; | |
4957 | ||
4958 | /* | |
4959 | * The rest should better be atomic, we can have disk failures | |
4960 | * noticed in interrupt contexts ... | |
4961 | */ | |
4962 | ||
4963 | rdev->raid_disk = -1; | |
4964 | ||
4965 | md_update_sb(mddev, 1); | |
4966 | ||
4967 | /* | |
4968 | * Kick recovery, maybe this spare has to be added to the | |
4969 | * array immediately. | |
4970 | */ | |
4971 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4972 | md_wakeup_thread(mddev->thread); | |
4973 | md_new_event(mddev); | |
4974 | return 0; | |
4975 | ||
4976 | abort_export: | |
4977 | export_rdev(rdev); | |
4978 | return err; | |
4979 | } | |
4980 | ||
4981 | static int set_bitmap_file(mddev_t *mddev, int fd) | |
4982 | { | |
4983 | int err; | |
4984 | ||
4985 | if (mddev->pers) { | |
4986 | if (!mddev->pers->quiesce) | |
4987 | return -EBUSY; | |
4988 | if (mddev->recovery || mddev->sync_thread) | |
4989 | return -EBUSY; | |
4990 | /* we should be able to change the bitmap.. */ | |
4991 | } | |
4992 | ||
4993 | ||
4994 | if (fd >= 0) { | |
4995 | if (mddev->bitmap) | |
4996 | return -EEXIST; /* cannot add when bitmap is present */ | |
4997 | mddev->bitmap_file = fget(fd); | |
4998 | ||
4999 | if (mddev->bitmap_file == NULL) { | |
5000 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
5001 | mdname(mddev)); | |
5002 | return -EBADF; | |
5003 | } | |
5004 | ||
5005 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
5006 | if (err) { | |
5007 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5008 | mdname(mddev)); | |
5009 | fput(mddev->bitmap_file); | |
5010 | mddev->bitmap_file = NULL; | |
5011 | return err; | |
5012 | } | |
5013 | mddev->bitmap_offset = 0; /* file overrides offset */ | |
5014 | } else if (mddev->bitmap == NULL) | |
5015 | return -ENOENT; /* cannot remove what isn't there */ | |
5016 | err = 0; | |
5017 | if (mddev->pers) { | |
5018 | mddev->pers->quiesce(mddev, 1); | |
5019 | if (fd >= 0) | |
5020 | err = bitmap_create(mddev); | |
5021 | if (fd < 0 || err) { | |
5022 | bitmap_destroy(mddev); | |
5023 | fd = -1; /* make sure to put the file */ | |
5024 | } | |
5025 | mddev->pers->quiesce(mddev, 0); | |
5026 | } | |
5027 | if (fd < 0) { | |
5028 | if (mddev->bitmap_file) { | |
5029 | restore_bitmap_write_access(mddev->bitmap_file); | |
5030 | fput(mddev->bitmap_file); | |
5031 | } | |
5032 | mddev->bitmap_file = NULL; | |
5033 | } | |
5034 | ||
5035 | return err; | |
5036 | } | |
5037 | ||
5038 | /* | |
5039 | * set_array_info is used two different ways | |
5040 | * The original usage is when creating a new array. | |
5041 | * In this usage, raid_disks is > 0 and it together with | |
5042 | * level, size, not_persistent,layout,chunksize determine the | |
5043 | * shape of the array. | |
5044 | * This will always create an array with a type-0.90.0 superblock. | |
5045 | * The newer usage is when assembling an array. | |
5046 | * In this case raid_disks will be 0, and the major_version field is | |
5047 | * use to determine which style super-blocks are to be found on the devices. | |
5048 | * The minor and patch _version numbers are also kept incase the | |
5049 | * super_block handler wishes to interpret them. | |
5050 | */ | |
5051 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5052 | { | |
5053 | ||
5054 | if (info->raid_disks == 0) { | |
5055 | /* just setting version number for superblock loading */ | |
5056 | if (info->major_version < 0 || | |
5057 | info->major_version >= ARRAY_SIZE(super_types) || | |
5058 | super_types[info->major_version].name == NULL) { | |
5059 | /* maybe try to auto-load a module? */ | |
5060 | printk(KERN_INFO | |
5061 | "md: superblock version %d not known\n", | |
5062 | info->major_version); | |
5063 | return -EINVAL; | |
5064 | } | |
5065 | mddev->major_version = info->major_version; | |
5066 | mddev->minor_version = info->minor_version; | |
5067 | mddev->patch_version = info->patch_version; | |
5068 | mddev->persistent = !info->not_persistent; | |
5069 | return 0; | |
5070 | } | |
5071 | mddev->major_version = MD_MAJOR_VERSION; | |
5072 | mddev->minor_version = MD_MINOR_VERSION; | |
5073 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5074 | mddev->ctime = get_seconds(); | |
5075 | ||
5076 | mddev->level = info->level; | |
5077 | mddev->clevel[0] = 0; | |
5078 | mddev->dev_sectors = 2 * (sector_t)info->size; | |
5079 | mddev->raid_disks = info->raid_disks; | |
5080 | /* don't set md_minor, it is determined by which /dev/md* was | |
5081 | * openned | |
5082 | */ | |
5083 | if (info->state & (1<<MD_SB_CLEAN)) | |
5084 | mddev->recovery_cp = MaxSector; | |
5085 | else | |
5086 | mddev->recovery_cp = 0; | |
5087 | mddev->persistent = ! info->not_persistent; | |
5088 | mddev->external = 0; | |
5089 | ||
5090 | mddev->layout = info->layout; | |
5091 | mddev->chunk_sectors = info->chunk_size >> 9; | |
5092 | ||
5093 | mddev->max_disks = MD_SB_DISKS; | |
5094 | ||
5095 | if (mddev->persistent) | |
5096 | mddev->flags = 0; | |
5097 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
5098 | ||
5099 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; | |
5100 | mddev->bitmap_offset = 0; | |
5101 | ||
5102 | mddev->reshape_position = MaxSector; | |
5103 | ||
5104 | /* | |
5105 | * Generate a 128 bit UUID | |
5106 | */ | |
5107 | get_random_bytes(mddev->uuid, 16); | |
5108 | ||
5109 | mddev->new_level = mddev->level; | |
5110 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
5111 | mddev->new_layout = mddev->layout; | |
5112 | mddev->delta_disks = 0; | |
5113 | ||
5114 | return 0; | |
5115 | } | |
5116 | ||
5117 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) | |
5118 | { | |
5119 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); | |
5120 | ||
5121 | if (mddev->external_size) | |
5122 | return; | |
5123 | ||
5124 | mddev->array_sectors = array_sectors; | |
5125 | } | |
5126 | EXPORT_SYMBOL(md_set_array_sectors); | |
5127 | ||
5128 | static int update_size(mddev_t *mddev, sector_t num_sectors) | |
5129 | { | |
5130 | mdk_rdev_t *rdev; | |
5131 | int rv; | |
5132 | int fit = (num_sectors == 0); | |
5133 | ||
5134 | if (mddev->pers->resize == NULL) | |
5135 | return -EINVAL; | |
5136 | /* The "num_sectors" is the number of sectors of each device that | |
5137 | * is used. This can only make sense for arrays with redundancy. | |
5138 | * linear and raid0 always use whatever space is available. We can only | |
5139 | * consider changing this number if no resync or reconstruction is | |
5140 | * happening, and if the new size is acceptable. It must fit before the | |
5141 | * sb_start or, if that is <data_offset, it must fit before the size | |
5142 | * of each device. If num_sectors is zero, we find the largest size | |
5143 | * that fits. | |
5144 | ||
5145 | */ | |
5146 | if (mddev->sync_thread) | |
5147 | return -EBUSY; | |
5148 | if (mddev->bitmap) | |
5149 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5150 | * grow, and re-add. | |
5151 | */ | |
5152 | return -EBUSY; | |
5153 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
5154 | sector_t avail = rdev->sectors; | |
5155 | ||
5156 | if (fit && (num_sectors == 0 || num_sectors > avail)) | |
5157 | num_sectors = avail; | |
5158 | if (avail < num_sectors) | |
5159 | return -ENOSPC; | |
5160 | } | |
5161 | rv = mddev->pers->resize(mddev, num_sectors); | |
5162 | if (!rv) | |
5163 | revalidate_disk(mddev->gendisk); | |
5164 | return rv; | |
5165 | } | |
5166 | ||
5167 | static int update_raid_disks(mddev_t *mddev, int raid_disks) | |
5168 | { | |
5169 | int rv; | |
5170 | /* change the number of raid disks */ | |
5171 | if (mddev->pers->check_reshape == NULL) | |
5172 | return -EINVAL; | |
5173 | if (raid_disks <= 0 || | |
5174 | raid_disks >= mddev->max_disks) | |
5175 | return -EINVAL; | |
5176 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) | |
5177 | return -EBUSY; | |
5178 | mddev->delta_disks = raid_disks - mddev->raid_disks; | |
5179 | ||
5180 | rv = mddev->pers->check_reshape(mddev); | |
5181 | return rv; | |
5182 | } | |
5183 | ||
5184 | ||
5185 | /* | |
5186 | * update_array_info is used to change the configuration of an | |
5187 | * on-line array. | |
5188 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5189 | * fields in the info are checked against the array. | |
5190 | * Any differences that cannot be handled will cause an error. | |
5191 | * Normally, only one change can be managed at a time. | |
5192 | */ | |
5193 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5194 | { | |
5195 | int rv = 0; | |
5196 | int cnt = 0; | |
5197 | int state = 0; | |
5198 | ||
5199 | /* calculate expected state,ignoring low bits */ | |
5200 | if (mddev->bitmap && mddev->bitmap_offset) | |
5201 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
5202 | ||
5203 | if (mddev->major_version != info->major_version || | |
5204 | mddev->minor_version != info->minor_version || | |
5205 | /* mddev->patch_version != info->patch_version || */ | |
5206 | mddev->ctime != info->ctime || | |
5207 | mddev->level != info->level || | |
5208 | /* mddev->layout != info->layout || */ | |
5209 | !mddev->persistent != info->not_persistent|| | |
5210 | mddev->chunk_sectors != info->chunk_size >> 9 || | |
5211 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
5212 | ((state^info->state) & 0xfffffe00) | |
5213 | ) | |
5214 | return -EINVAL; | |
5215 | /* Check there is only one change */ | |
5216 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) | |
5217 | cnt++; | |
5218 | if (mddev->raid_disks != info->raid_disks) | |
5219 | cnt++; | |
5220 | if (mddev->layout != info->layout) | |
5221 | cnt++; | |
5222 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5223 | cnt++; | |
5224 | if (cnt == 0) | |
5225 | return 0; | |
5226 | if (cnt > 1) | |
5227 | return -EINVAL; | |
5228 | ||
5229 | if (mddev->layout != info->layout) { | |
5230 | /* Change layout | |
5231 | * we don't need to do anything at the md level, the | |
5232 | * personality will take care of it all. | |
5233 | */ | |
5234 | if (mddev->pers->check_reshape == NULL) | |
5235 | return -EINVAL; | |
5236 | else { | |
5237 | mddev->new_layout = info->layout; | |
5238 | rv = mddev->pers->check_reshape(mddev); | |
5239 | if (rv) | |
5240 | mddev->new_layout = mddev->layout; | |
5241 | return rv; | |
5242 | } | |
5243 | } | |
5244 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) | |
5245 | rv = update_size(mddev, (sector_t)info->size * 2); | |
5246 | ||
5247 | if (mddev->raid_disks != info->raid_disks) | |
5248 | rv = update_raid_disks(mddev, info->raid_disks); | |
5249 | ||
5250 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { | |
5251 | if (mddev->pers->quiesce == NULL) | |
5252 | return -EINVAL; | |
5253 | if (mddev->recovery || mddev->sync_thread) | |
5254 | return -EBUSY; | |
5255 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5256 | /* add the bitmap */ | |
5257 | if (mddev->bitmap) | |
5258 | return -EEXIST; | |
5259 | if (mddev->default_bitmap_offset == 0) | |
5260 | return -EINVAL; | |
5261 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
5262 | mddev->pers->quiesce(mddev, 1); | |
5263 | rv = bitmap_create(mddev); | |
5264 | if (rv) | |
5265 | bitmap_destroy(mddev); | |
5266 | mddev->pers->quiesce(mddev, 0); | |
5267 | } else { | |
5268 | /* remove the bitmap */ | |
5269 | if (!mddev->bitmap) | |
5270 | return -ENOENT; | |
5271 | if (mddev->bitmap->file) | |
5272 | return -EINVAL; | |
5273 | mddev->pers->quiesce(mddev, 1); | |
5274 | bitmap_destroy(mddev); | |
5275 | mddev->pers->quiesce(mddev, 0); | |
5276 | mddev->bitmap_offset = 0; | |
5277 | } | |
5278 | } | |
5279 | md_update_sb(mddev, 1); | |
5280 | return rv; | |
5281 | } | |
5282 | ||
5283 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5284 | { | |
5285 | mdk_rdev_t *rdev; | |
5286 | ||
5287 | if (mddev->pers == NULL) | |
5288 | return -ENODEV; | |
5289 | ||
5290 | rdev = find_rdev(mddev, dev); | |
5291 | if (!rdev) | |
5292 | return -ENODEV; | |
5293 | ||
5294 | md_error(mddev, rdev); | |
5295 | return 0; | |
5296 | } | |
5297 | ||
5298 | /* | |
5299 | * We have a problem here : there is no easy way to give a CHS | |
5300 | * virtual geometry. We currently pretend that we have a 2 heads | |
5301 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5302 | * dosfs just mad... ;-) | |
5303 | */ | |
5304 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
5305 | { | |
5306 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5307 | ||
5308 | geo->heads = 2; | |
5309 | geo->sectors = 4; | |
5310 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
5311 | return 0; | |
5312 | } | |
5313 | ||
5314 | static int md_ioctl(struct block_device *bdev, fmode_t mode, | |
5315 | unsigned int cmd, unsigned long arg) | |
5316 | { | |
5317 | int err = 0; | |
5318 | void __user *argp = (void __user *)arg; | |
5319 | mddev_t *mddev = NULL; | |
5320 | ||
5321 | if (!capable(CAP_SYS_ADMIN)) | |
5322 | return -EACCES; | |
5323 | ||
5324 | /* | |
5325 | * Commands dealing with the RAID driver but not any | |
5326 | * particular array: | |
5327 | */ | |
5328 | switch (cmd) | |
5329 | { | |
5330 | case RAID_VERSION: | |
5331 | err = get_version(argp); | |
5332 | goto done; | |
5333 | ||
5334 | case PRINT_RAID_DEBUG: | |
5335 | err = 0; | |
5336 | md_print_devices(); | |
5337 | goto done; | |
5338 | ||
5339 | #ifndef MODULE | |
5340 | case RAID_AUTORUN: | |
5341 | err = 0; | |
5342 | autostart_arrays(arg); | |
5343 | goto done; | |
5344 | #endif | |
5345 | default:; | |
5346 | } | |
5347 | ||
5348 | /* | |
5349 | * Commands creating/starting a new array: | |
5350 | */ | |
5351 | ||
5352 | mddev = bdev->bd_disk->private_data; | |
5353 | ||
5354 | if (!mddev) { | |
5355 | BUG(); | |
5356 | goto abort; | |
5357 | } | |
5358 | ||
5359 | err = mddev_lock(mddev); | |
5360 | if (err) { | |
5361 | printk(KERN_INFO | |
5362 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5363 | err, cmd); | |
5364 | goto abort; | |
5365 | } | |
5366 | ||
5367 | switch (cmd) | |
5368 | { | |
5369 | case SET_ARRAY_INFO: | |
5370 | { | |
5371 | mdu_array_info_t info; | |
5372 | if (!arg) | |
5373 | memset(&info, 0, sizeof(info)); | |
5374 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5375 | err = -EFAULT; | |
5376 | goto abort_unlock; | |
5377 | } | |
5378 | if (mddev->pers) { | |
5379 | err = update_array_info(mddev, &info); | |
5380 | if (err) { | |
5381 | printk(KERN_WARNING "md: couldn't update" | |
5382 | " array info. %d\n", err); | |
5383 | goto abort_unlock; | |
5384 | } | |
5385 | goto done_unlock; | |
5386 | } | |
5387 | if (!list_empty(&mddev->disks)) { | |
5388 | printk(KERN_WARNING | |
5389 | "md: array %s already has disks!\n", | |
5390 | mdname(mddev)); | |
5391 | err = -EBUSY; | |
5392 | goto abort_unlock; | |
5393 | } | |
5394 | if (mddev->raid_disks) { | |
5395 | printk(KERN_WARNING | |
5396 | "md: array %s already initialised!\n", | |
5397 | mdname(mddev)); | |
5398 | err = -EBUSY; | |
5399 | goto abort_unlock; | |
5400 | } | |
5401 | err = set_array_info(mddev, &info); | |
5402 | if (err) { | |
5403 | printk(KERN_WARNING "md: couldn't set" | |
5404 | " array info. %d\n", err); | |
5405 | goto abort_unlock; | |
5406 | } | |
5407 | } | |
5408 | goto done_unlock; | |
5409 | ||
5410 | default:; | |
5411 | } | |
5412 | ||
5413 | /* | |
5414 | * Commands querying/configuring an existing array: | |
5415 | */ | |
5416 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, | |
5417 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ | |
5418 | if ((!mddev->raid_disks && !mddev->external) | |
5419 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5420 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5421 | && cmd != GET_BITMAP_FILE) { | |
5422 | err = -ENODEV; | |
5423 | goto abort_unlock; | |
5424 | } | |
5425 | ||
5426 | /* | |
5427 | * Commands even a read-only array can execute: | |
5428 | */ | |
5429 | switch (cmd) | |
5430 | { | |
5431 | case GET_ARRAY_INFO: | |
5432 | err = get_array_info(mddev, argp); | |
5433 | goto done_unlock; | |
5434 | ||
5435 | case GET_BITMAP_FILE: | |
5436 | err = get_bitmap_file(mddev, argp); | |
5437 | goto done_unlock; | |
5438 | ||
5439 | case GET_DISK_INFO: | |
5440 | err = get_disk_info(mddev, argp); | |
5441 | goto done_unlock; | |
5442 | ||
5443 | case RESTART_ARRAY_RW: | |
5444 | err = restart_array(mddev); | |
5445 | goto done_unlock; | |
5446 | ||
5447 | case STOP_ARRAY: | |
5448 | err = do_md_stop(mddev, 0, 1); | |
5449 | goto done_unlock; | |
5450 | ||
5451 | case STOP_ARRAY_RO: | |
5452 | err = do_md_stop(mddev, 1, 1); | |
5453 | goto done_unlock; | |
5454 | ||
5455 | } | |
5456 | ||
5457 | /* | |
5458 | * The remaining ioctls are changing the state of the | |
5459 | * superblock, so we do not allow them on read-only arrays. | |
5460 | * However non-MD ioctls (e.g. get-size) will still come through | |
5461 | * here and hit the 'default' below, so only disallow | |
5462 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
5463 | */ | |
5464 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { | |
5465 | if (mddev->ro == 2) { | |
5466 | mddev->ro = 0; | |
5467 | sysfs_notify_dirent(mddev->sysfs_state); | |
5468 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5469 | md_wakeup_thread(mddev->thread); | |
5470 | } else { | |
5471 | err = -EROFS; | |
5472 | goto abort_unlock; | |
5473 | } | |
5474 | } | |
5475 | ||
5476 | switch (cmd) | |
5477 | { | |
5478 | case ADD_NEW_DISK: | |
5479 | { | |
5480 | mdu_disk_info_t info; | |
5481 | if (copy_from_user(&info, argp, sizeof(info))) | |
5482 | err = -EFAULT; | |
5483 | else | |
5484 | err = add_new_disk(mddev, &info); | |
5485 | goto done_unlock; | |
5486 | } | |
5487 | ||
5488 | case HOT_REMOVE_DISK: | |
5489 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5490 | goto done_unlock; | |
5491 | ||
5492 | case HOT_ADD_DISK: | |
5493 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5494 | goto done_unlock; | |
5495 | ||
5496 | case SET_DISK_FAULTY: | |
5497 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5498 | goto done_unlock; | |
5499 | ||
5500 | case RUN_ARRAY: | |
5501 | err = do_md_run(mddev); | |
5502 | goto done_unlock; | |
5503 | ||
5504 | case SET_BITMAP_FILE: | |
5505 | err = set_bitmap_file(mddev, (int)arg); | |
5506 | goto done_unlock; | |
5507 | ||
5508 | default: | |
5509 | err = -EINVAL; | |
5510 | goto abort_unlock; | |
5511 | } | |
5512 | ||
5513 | done_unlock: | |
5514 | abort_unlock: | |
5515 | if (mddev->hold_active == UNTIL_IOCTL && | |
5516 | err != -EINVAL) | |
5517 | mddev->hold_active = 0; | |
5518 | mddev_unlock(mddev); | |
5519 | ||
5520 | return err; | |
5521 | done: | |
5522 | if (err) | |
5523 | MD_BUG(); | |
5524 | abort: | |
5525 | return err; | |
5526 | } | |
5527 | ||
5528 | static int md_open(struct block_device *bdev, fmode_t mode) | |
5529 | { | |
5530 | /* | |
5531 | * Succeed if we can lock the mddev, which confirms that | |
5532 | * it isn't being stopped right now. | |
5533 | */ | |
5534 | mddev_t *mddev = mddev_find(bdev->bd_dev); | |
5535 | int err; | |
5536 | ||
5537 | if (mddev->gendisk != bdev->bd_disk) { | |
5538 | /* we are racing with mddev_put which is discarding this | |
5539 | * bd_disk. | |
5540 | */ | |
5541 | mddev_put(mddev); | |
5542 | /* Wait until bdev->bd_disk is definitely gone */ | |
5543 | flush_scheduled_work(); | |
5544 | /* Then retry the open from the top */ | |
5545 | return -ERESTARTSYS; | |
5546 | } | |
5547 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5548 | ||
5549 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) | |
5550 | goto out; | |
5551 | ||
5552 | err = 0; | |
5553 | atomic_inc(&mddev->openers); | |
5554 | mutex_unlock(&mddev->open_mutex); | |
5555 | ||
5556 | check_disk_change(bdev); | |
5557 | out: | |
5558 | return err; | |
5559 | } | |
5560 | ||
5561 | static int md_release(struct gendisk *disk, fmode_t mode) | |
5562 | { | |
5563 | mddev_t *mddev = disk->private_data; | |
5564 | ||
5565 | BUG_ON(!mddev); | |
5566 | atomic_dec(&mddev->openers); | |
5567 | mddev_put(mddev); | |
5568 | ||
5569 | return 0; | |
5570 | } | |
5571 | ||
5572 | static int md_media_changed(struct gendisk *disk) | |
5573 | { | |
5574 | mddev_t *mddev = disk->private_data; | |
5575 | ||
5576 | return mddev->changed; | |
5577 | } | |
5578 | ||
5579 | static int md_revalidate(struct gendisk *disk) | |
5580 | { | |
5581 | mddev_t *mddev = disk->private_data; | |
5582 | ||
5583 | mddev->changed = 0; | |
5584 | return 0; | |
5585 | } | |
5586 | static const struct block_device_operations md_fops = | |
5587 | { | |
5588 | .owner = THIS_MODULE, | |
5589 | .open = md_open, | |
5590 | .release = md_release, | |
5591 | .ioctl = md_ioctl, | |
5592 | .getgeo = md_getgeo, | |
5593 | .media_changed = md_media_changed, | |
5594 | .revalidate_disk= md_revalidate, | |
5595 | }; | |
5596 | ||
5597 | static int md_thread(void * arg) | |
5598 | { | |
5599 | mdk_thread_t *thread = arg; | |
5600 | ||
5601 | /* | |
5602 | * md_thread is a 'system-thread', it's priority should be very | |
5603 | * high. We avoid resource deadlocks individually in each | |
5604 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5605 | * the very same RT priority as kswapd, thus we will never get | |
5606 | * into a priority inversion deadlock. | |
5607 | * | |
5608 | * we definitely have to have equal or higher priority than | |
5609 | * bdflush, otherwise bdflush will deadlock if there are too | |
5610 | * many dirty RAID5 blocks. | |
5611 | */ | |
5612 | ||
5613 | allow_signal(SIGKILL); | |
5614 | while (!kthread_should_stop()) { | |
5615 | ||
5616 | /* We need to wait INTERRUPTIBLE so that | |
5617 | * we don't add to the load-average. | |
5618 | * That means we need to be sure no signals are | |
5619 | * pending | |
5620 | */ | |
5621 | if (signal_pending(current)) | |
5622 | flush_signals(current); | |
5623 | ||
5624 | wait_event_interruptible_timeout | |
5625 | (thread->wqueue, | |
5626 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5627 | || kthread_should_stop(), | |
5628 | thread->timeout); | |
5629 | ||
5630 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5631 | ||
5632 | thread->run(thread->mddev); | |
5633 | } | |
5634 | ||
5635 | return 0; | |
5636 | } | |
5637 | ||
5638 | void md_wakeup_thread(mdk_thread_t *thread) | |
5639 | { | |
5640 | if (thread) { | |
5641 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5642 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5643 | wake_up(&thread->wqueue); | |
5644 | } | |
5645 | } | |
5646 | ||
5647 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5648 | const char *name) | |
5649 | { | |
5650 | mdk_thread_t *thread; | |
5651 | ||
5652 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); | |
5653 | if (!thread) | |
5654 | return NULL; | |
5655 | ||
5656 | init_waitqueue_head(&thread->wqueue); | |
5657 | ||
5658 | thread->run = run; | |
5659 | thread->mddev = mddev; | |
5660 | thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
5661 | thread->tsk = kthread_run(md_thread, thread, | |
5662 | "%s_%s", | |
5663 | mdname(thread->mddev), | |
5664 | name ?: mddev->pers->name); | |
5665 | if (IS_ERR(thread->tsk)) { | |
5666 | kfree(thread); | |
5667 | return NULL; | |
5668 | } | |
5669 | return thread; | |
5670 | } | |
5671 | ||
5672 | void md_unregister_thread(mdk_thread_t *thread) | |
5673 | { | |
5674 | if (!thread) | |
5675 | return; | |
5676 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); | |
5677 | ||
5678 | kthread_stop(thread->tsk); | |
5679 | kfree(thread); | |
5680 | } | |
5681 | ||
5682 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5683 | { | |
5684 | if (!mddev) { | |
5685 | MD_BUG(); | |
5686 | return; | |
5687 | } | |
5688 | ||
5689 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
5690 | return; | |
5691 | ||
5692 | if (mddev->external) | |
5693 | set_bit(Blocked, &rdev->flags); | |
5694 | /* | |
5695 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", | |
5696 | mdname(mddev), | |
5697 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5698 | __builtin_return_address(0),__builtin_return_address(1), | |
5699 | __builtin_return_address(2),__builtin_return_address(3)); | |
5700 | */ | |
5701 | if (!mddev->pers) | |
5702 | return; | |
5703 | if (!mddev->pers->error_handler) | |
5704 | return; | |
5705 | mddev->pers->error_handler(mddev,rdev); | |
5706 | if (mddev->degraded) | |
5707 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
5708 | set_bit(StateChanged, &rdev->flags); | |
5709 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5710 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5711 | md_wakeup_thread(mddev->thread); | |
5712 | md_new_event_inintr(mddev); | |
5713 | } | |
5714 | ||
5715 | /* seq_file implementation /proc/mdstat */ | |
5716 | ||
5717 | static void status_unused(struct seq_file *seq) | |
5718 | { | |
5719 | int i = 0; | |
5720 | mdk_rdev_t *rdev; | |
5721 | ||
5722 | seq_printf(seq, "unused devices: "); | |
5723 | ||
5724 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { | |
5725 | char b[BDEVNAME_SIZE]; | |
5726 | i++; | |
5727 | seq_printf(seq, "%s ", | |
5728 | bdevname(rdev->bdev,b)); | |
5729 | } | |
5730 | if (!i) | |
5731 | seq_printf(seq, "<none>"); | |
5732 | ||
5733 | seq_printf(seq, "\n"); | |
5734 | } | |
5735 | ||
5736 | ||
5737 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5738 | { | |
5739 | sector_t max_sectors, resync, res; | |
5740 | unsigned long dt, db; | |
5741 | sector_t rt; | |
5742 | int scale; | |
5743 | unsigned int per_milli; | |
5744 | ||
5745 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); | |
5746 | ||
5747 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
5748 | max_sectors = mddev->resync_max_sectors; | |
5749 | else | |
5750 | max_sectors = mddev->dev_sectors; | |
5751 | ||
5752 | /* | |
5753 | * Should not happen. | |
5754 | */ | |
5755 | if (!max_sectors) { | |
5756 | MD_BUG(); | |
5757 | return; | |
5758 | } | |
5759 | /* Pick 'scale' such that (resync>>scale)*1000 will fit | |
5760 | * in a sector_t, and (max_sectors>>scale) will fit in a | |
5761 | * u32, as those are the requirements for sector_div. | |
5762 | * Thus 'scale' must be at least 10 | |
5763 | */ | |
5764 | scale = 10; | |
5765 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
5766 | while ( max_sectors/2 > (1ULL<<(scale+32))) | |
5767 | scale++; | |
5768 | } | |
5769 | res = (resync>>scale)*1000; | |
5770 | sector_div(res, (u32)((max_sectors>>scale)+1)); | |
5771 | ||
5772 | per_milli = res; | |
5773 | { | |
5774 | int i, x = per_milli/50, y = 20-x; | |
5775 | seq_printf(seq, "["); | |
5776 | for (i = 0; i < x; i++) | |
5777 | seq_printf(seq, "="); | |
5778 | seq_printf(seq, ">"); | |
5779 | for (i = 0; i < y; i++) | |
5780 | seq_printf(seq, "."); | |
5781 | seq_printf(seq, "] "); | |
5782 | } | |
5783 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", | |
5784 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? | |
5785 | "reshape" : | |
5786 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? | |
5787 | "check" : | |
5788 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5789 | "resync" : "recovery"))), | |
5790 | per_milli/10, per_milli % 10, | |
5791 | (unsigned long long) resync/2, | |
5792 | (unsigned long long) max_sectors/2); | |
5793 | ||
5794 | /* | |
5795 | * dt: time from mark until now | |
5796 | * db: blocks written from mark until now | |
5797 | * rt: remaining time | |
5798 | * | |
5799 | * rt is a sector_t, so could be 32bit or 64bit. | |
5800 | * So we divide before multiply in case it is 32bit and close | |
5801 | * to the limit. | |
5802 | * We scale the divisor (db) by 32 to avoid loosing precision | |
5803 | * near the end of resync when the number of remaining sectors | |
5804 | * is close to 'db'. | |
5805 | * We then divide rt by 32 after multiplying by db to compensate. | |
5806 | * The '+1' avoids division by zero if db is very small. | |
5807 | */ | |
5808 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5809 | if (!dt) dt++; | |
5810 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) | |
5811 | - mddev->resync_mark_cnt; | |
5812 | ||
5813 | rt = max_sectors - resync; /* number of remaining sectors */ | |
5814 | sector_div(rt, db/32+1); | |
5815 | rt *= dt; | |
5816 | rt >>= 5; | |
5817 | ||
5818 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
5819 | ((unsigned long)rt % 60)/6); | |
5820 | ||
5821 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); | |
5822 | } | |
5823 | ||
5824 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5825 | { | |
5826 | struct list_head *tmp; | |
5827 | loff_t l = *pos; | |
5828 | mddev_t *mddev; | |
5829 | ||
5830 | if (l >= 0x10000) | |
5831 | return NULL; | |
5832 | if (!l--) | |
5833 | /* header */ | |
5834 | return (void*)1; | |
5835 | ||
5836 | spin_lock(&all_mddevs_lock); | |
5837 | list_for_each(tmp,&all_mddevs) | |
5838 | if (!l--) { | |
5839 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
5840 | mddev_get(mddev); | |
5841 | spin_unlock(&all_mddevs_lock); | |
5842 | return mddev; | |
5843 | } | |
5844 | spin_unlock(&all_mddevs_lock); | |
5845 | if (!l--) | |
5846 | return (void*)2;/* tail */ | |
5847 | return NULL; | |
5848 | } | |
5849 | ||
5850 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
5851 | { | |
5852 | struct list_head *tmp; | |
5853 | mddev_t *next_mddev, *mddev = v; | |
5854 | ||
5855 | ++*pos; | |
5856 | if (v == (void*)2) | |
5857 | return NULL; | |
5858 | ||
5859 | spin_lock(&all_mddevs_lock); | |
5860 | if (v == (void*)1) | |
5861 | tmp = all_mddevs.next; | |
5862 | else | |
5863 | tmp = mddev->all_mddevs.next; | |
5864 | if (tmp != &all_mddevs) | |
5865 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
5866 | else { | |
5867 | next_mddev = (void*)2; | |
5868 | *pos = 0x10000; | |
5869 | } | |
5870 | spin_unlock(&all_mddevs_lock); | |
5871 | ||
5872 | if (v != (void*)1) | |
5873 | mddev_put(mddev); | |
5874 | return next_mddev; | |
5875 | ||
5876 | } | |
5877 | ||
5878 | static void md_seq_stop(struct seq_file *seq, void *v) | |
5879 | { | |
5880 | mddev_t *mddev = v; | |
5881 | ||
5882 | if (mddev && v != (void*)1 && v != (void*)2) | |
5883 | mddev_put(mddev); | |
5884 | } | |
5885 | ||
5886 | struct mdstat_info { | |
5887 | int event; | |
5888 | }; | |
5889 | ||
5890 | static int md_seq_show(struct seq_file *seq, void *v) | |
5891 | { | |
5892 | mddev_t *mddev = v; | |
5893 | sector_t sectors; | |
5894 | mdk_rdev_t *rdev; | |
5895 | struct mdstat_info *mi = seq->private; | |
5896 | struct bitmap *bitmap; | |
5897 | ||
5898 | if (v == (void*)1) { | |
5899 | struct mdk_personality *pers; | |
5900 | seq_printf(seq, "Personalities : "); | |
5901 | spin_lock(&pers_lock); | |
5902 | list_for_each_entry(pers, &pers_list, list) | |
5903 | seq_printf(seq, "[%s] ", pers->name); | |
5904 | ||
5905 | spin_unlock(&pers_lock); | |
5906 | seq_printf(seq, "\n"); | |
5907 | mi->event = atomic_read(&md_event_count); | |
5908 | return 0; | |
5909 | } | |
5910 | if (v == (void*)2) { | |
5911 | status_unused(seq); | |
5912 | return 0; | |
5913 | } | |
5914 | ||
5915 | if (mddev_lock(mddev) < 0) | |
5916 | return -EINTR; | |
5917 | ||
5918 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { | |
5919 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
5920 | mddev->pers ? "" : "in"); | |
5921 | if (mddev->pers) { | |
5922 | if (mddev->ro==1) | |
5923 | seq_printf(seq, " (read-only)"); | |
5924 | if (mddev->ro==2) | |
5925 | seq_printf(seq, " (auto-read-only)"); | |
5926 | seq_printf(seq, " %s", mddev->pers->name); | |
5927 | } | |
5928 | ||
5929 | sectors = 0; | |
5930 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
5931 | char b[BDEVNAME_SIZE]; | |
5932 | seq_printf(seq, " %s[%d]", | |
5933 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
5934 | if (test_bit(WriteMostly, &rdev->flags)) | |
5935 | seq_printf(seq, "(W)"); | |
5936 | if (test_bit(Faulty, &rdev->flags)) { | |
5937 | seq_printf(seq, "(F)"); | |
5938 | continue; | |
5939 | } else if (rdev->raid_disk < 0) | |
5940 | seq_printf(seq, "(S)"); /* spare */ | |
5941 | sectors += rdev->sectors; | |
5942 | } | |
5943 | ||
5944 | if (!list_empty(&mddev->disks)) { | |
5945 | if (mddev->pers) | |
5946 | seq_printf(seq, "\n %llu blocks", | |
5947 | (unsigned long long) | |
5948 | mddev->array_sectors / 2); | |
5949 | else | |
5950 | seq_printf(seq, "\n %llu blocks", | |
5951 | (unsigned long long)sectors / 2); | |
5952 | } | |
5953 | if (mddev->persistent) { | |
5954 | if (mddev->major_version != 0 || | |
5955 | mddev->minor_version != 90) { | |
5956 | seq_printf(seq," super %d.%d", | |
5957 | mddev->major_version, | |
5958 | mddev->minor_version); | |
5959 | } | |
5960 | } else if (mddev->external) | |
5961 | seq_printf(seq, " super external:%s", | |
5962 | mddev->metadata_type); | |
5963 | else | |
5964 | seq_printf(seq, " super non-persistent"); | |
5965 | ||
5966 | if (mddev->pers) { | |
5967 | mddev->pers->status(seq, mddev); | |
5968 | seq_printf(seq, "\n "); | |
5969 | if (mddev->pers->sync_request) { | |
5970 | if (mddev->curr_resync > 2) { | |
5971 | status_resync(seq, mddev); | |
5972 | seq_printf(seq, "\n "); | |
5973 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
5974 | seq_printf(seq, "\tresync=DELAYED\n "); | |
5975 | else if (mddev->recovery_cp < MaxSector) | |
5976 | seq_printf(seq, "\tresync=PENDING\n "); | |
5977 | } | |
5978 | } else | |
5979 | seq_printf(seq, "\n "); | |
5980 | ||
5981 | if ((bitmap = mddev->bitmap)) { | |
5982 | unsigned long chunk_kb; | |
5983 | unsigned long flags; | |
5984 | spin_lock_irqsave(&bitmap->lock, flags); | |
5985 | chunk_kb = bitmap->chunksize >> 10; | |
5986 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
5987 | "%lu%s chunk", | |
5988 | bitmap->pages - bitmap->missing_pages, | |
5989 | bitmap->pages, | |
5990 | (bitmap->pages - bitmap->missing_pages) | |
5991 | << (PAGE_SHIFT - 10), | |
5992 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
5993 | chunk_kb ? "KB" : "B"); | |
5994 | if (bitmap->file) { | |
5995 | seq_printf(seq, ", file: "); | |
5996 | seq_path(seq, &bitmap->file->f_path, " \t\n"); | |
5997 | } | |
5998 | ||
5999 | seq_printf(seq, "\n"); | |
6000 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
6001 | } | |
6002 | ||
6003 | seq_printf(seq, "\n"); | |
6004 | } | |
6005 | mddev_unlock(mddev); | |
6006 | ||
6007 | return 0; | |
6008 | } | |
6009 | ||
6010 | static const struct seq_operations md_seq_ops = { | |
6011 | .start = md_seq_start, | |
6012 | .next = md_seq_next, | |
6013 | .stop = md_seq_stop, | |
6014 | .show = md_seq_show, | |
6015 | }; | |
6016 | ||
6017 | static int md_seq_open(struct inode *inode, struct file *file) | |
6018 | { | |
6019 | int error; | |
6020 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); | |
6021 | if (mi == NULL) | |
6022 | return -ENOMEM; | |
6023 | ||
6024 | error = seq_open(file, &md_seq_ops); | |
6025 | if (error) | |
6026 | kfree(mi); | |
6027 | else { | |
6028 | struct seq_file *p = file->private_data; | |
6029 | p->private = mi; | |
6030 | mi->event = atomic_read(&md_event_count); | |
6031 | } | |
6032 | return error; | |
6033 | } | |
6034 | ||
6035 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) | |
6036 | { | |
6037 | struct seq_file *m = filp->private_data; | |
6038 | struct mdstat_info *mi = m->private; | |
6039 | int mask; | |
6040 | ||
6041 | poll_wait(filp, &md_event_waiters, wait); | |
6042 | ||
6043 | /* always allow read */ | |
6044 | mask = POLLIN | POLLRDNORM; | |
6045 | ||
6046 | if (mi->event != atomic_read(&md_event_count)) | |
6047 | mask |= POLLERR | POLLPRI; | |
6048 | return mask; | |
6049 | } | |
6050 | ||
6051 | static const struct file_operations md_seq_fops = { | |
6052 | .owner = THIS_MODULE, | |
6053 | .open = md_seq_open, | |
6054 | .read = seq_read, | |
6055 | .llseek = seq_lseek, | |
6056 | .release = seq_release_private, | |
6057 | .poll = mdstat_poll, | |
6058 | }; | |
6059 | ||
6060 | int register_md_personality(struct mdk_personality *p) | |
6061 | { | |
6062 | spin_lock(&pers_lock); | |
6063 | list_add_tail(&p->list, &pers_list); | |
6064 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
6065 | spin_unlock(&pers_lock); | |
6066 | return 0; | |
6067 | } | |
6068 | ||
6069 | int unregister_md_personality(struct mdk_personality *p) | |
6070 | { | |
6071 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); | |
6072 | spin_lock(&pers_lock); | |
6073 | list_del_init(&p->list); | |
6074 | spin_unlock(&pers_lock); | |
6075 | return 0; | |
6076 | } | |
6077 | ||
6078 | static int is_mddev_idle(mddev_t *mddev, int init) | |
6079 | { | |
6080 | mdk_rdev_t * rdev; | |
6081 | int idle; | |
6082 | int curr_events; | |
6083 | ||
6084 | idle = 1; | |
6085 | rcu_read_lock(); | |
6086 | rdev_for_each_rcu(rdev, mddev) { | |
6087 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
6088 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + | |
6089 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6090 | atomic_read(&disk->sync_io); | |
6091 | /* sync IO will cause sync_io to increase before the disk_stats | |
6092 | * as sync_io is counted when a request starts, and | |
6093 | * disk_stats is counted when it completes. | |
6094 | * So resync activity will cause curr_events to be smaller than | |
6095 | * when there was no such activity. | |
6096 | * non-sync IO will cause disk_stat to increase without | |
6097 | * increasing sync_io so curr_events will (eventually) | |
6098 | * be larger than it was before. Once it becomes | |
6099 | * substantially larger, the test below will cause | |
6100 | * the array to appear non-idle, and resync will slow | |
6101 | * down. | |
6102 | * If there is a lot of outstanding resync activity when | |
6103 | * we set last_event to curr_events, then all that activity | |
6104 | * completing might cause the array to appear non-idle | |
6105 | * and resync will be slowed down even though there might | |
6106 | * not have been non-resync activity. This will only | |
6107 | * happen once though. 'last_events' will soon reflect | |
6108 | * the state where there is little or no outstanding | |
6109 | * resync requests, and further resync activity will | |
6110 | * always make curr_events less than last_events. | |
6111 | * | |
6112 | */ | |
6113 | if (init || curr_events - rdev->last_events > 64) { | |
6114 | rdev->last_events = curr_events; | |
6115 | idle = 0; | |
6116 | } | |
6117 | } | |
6118 | rcu_read_unlock(); | |
6119 | return idle; | |
6120 | } | |
6121 | ||
6122 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6123 | { | |
6124 | /* another "blocks" (512byte) blocks have been synced */ | |
6125 | atomic_sub(blocks, &mddev->recovery_active); | |
6126 | wake_up(&mddev->recovery_wait); | |
6127 | if (!ok) { | |
6128 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6129 | md_wakeup_thread(mddev->thread); | |
6130 | // stop recovery, signal do_sync .... | |
6131 | } | |
6132 | } | |
6133 | ||
6134 | ||
6135 | /* md_write_start(mddev, bi) | |
6136 | * If we need to update some array metadata (e.g. 'active' flag | |
6137 | * in superblock) before writing, schedule a superblock update | |
6138 | * and wait for it to complete. | |
6139 | */ | |
6140 | void md_write_start(mddev_t *mddev, struct bio *bi) | |
6141 | { | |
6142 | int did_change = 0; | |
6143 | if (bio_data_dir(bi) != WRITE) | |
6144 | return; | |
6145 | ||
6146 | BUG_ON(mddev->ro == 1); | |
6147 | if (mddev->ro == 2) { | |
6148 | /* need to switch to read/write */ | |
6149 | mddev->ro = 0; | |
6150 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6151 | md_wakeup_thread(mddev->thread); | |
6152 | md_wakeup_thread(mddev->sync_thread); | |
6153 | did_change = 1; | |
6154 | } | |
6155 | atomic_inc(&mddev->writes_pending); | |
6156 | if (mddev->safemode == 1) | |
6157 | mddev->safemode = 0; | |
6158 | if (mddev->in_sync) { | |
6159 | spin_lock_irq(&mddev->write_lock); | |
6160 | if (mddev->in_sync) { | |
6161 | mddev->in_sync = 0; | |
6162 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6163 | md_wakeup_thread(mddev->thread); | |
6164 | did_change = 1; | |
6165 | } | |
6166 | spin_unlock_irq(&mddev->write_lock); | |
6167 | } | |
6168 | if (did_change) | |
6169 | sysfs_notify_dirent(mddev->sysfs_state); | |
6170 | wait_event(mddev->sb_wait, | |
6171 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
6172 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
6173 | } | |
6174 | ||
6175 | void md_write_end(mddev_t *mddev) | |
6176 | { | |
6177 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6178 | if (mddev->safemode == 2) | |
6179 | md_wakeup_thread(mddev->thread); | |
6180 | else if (mddev->safemode_delay) | |
6181 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); | |
6182 | } | |
6183 | } | |
6184 | ||
6185 | /* md_allow_write(mddev) | |
6186 | * Calling this ensures that the array is marked 'active' so that writes | |
6187 | * may proceed without blocking. It is important to call this before | |
6188 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6189 | * Must be called with mddev_lock held. | |
6190 | * | |
6191 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6192 | * is dropped, so return -EAGAIN after notifying userspace. | |
6193 | */ | |
6194 | int md_allow_write(mddev_t *mddev) | |
6195 | { | |
6196 | if (!mddev->pers) | |
6197 | return 0; | |
6198 | if (mddev->ro) | |
6199 | return 0; | |
6200 | if (!mddev->pers->sync_request) | |
6201 | return 0; | |
6202 | ||
6203 | spin_lock_irq(&mddev->write_lock); | |
6204 | if (mddev->in_sync) { | |
6205 | mddev->in_sync = 0; | |
6206 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6207 | if (mddev->safemode_delay && | |
6208 | mddev->safemode == 0) | |
6209 | mddev->safemode = 1; | |
6210 | spin_unlock_irq(&mddev->write_lock); | |
6211 | md_update_sb(mddev, 0); | |
6212 | sysfs_notify_dirent(mddev->sysfs_state); | |
6213 | } else | |
6214 | spin_unlock_irq(&mddev->write_lock); | |
6215 | ||
6216 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
6217 | return -EAGAIN; | |
6218 | else | |
6219 | return 0; | |
6220 | } | |
6221 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6222 | ||
6223 | #define SYNC_MARKS 10 | |
6224 | #define SYNC_MARK_STEP (3*HZ) | |
6225 | void md_do_sync(mddev_t *mddev) | |
6226 | { | |
6227 | mddev_t *mddev2; | |
6228 | unsigned int currspeed = 0, | |
6229 | window; | |
6230 | sector_t max_sectors,j, io_sectors; | |
6231 | unsigned long mark[SYNC_MARKS]; | |
6232 | sector_t mark_cnt[SYNC_MARKS]; | |
6233 | int last_mark,m; | |
6234 | struct list_head *tmp; | |
6235 | sector_t last_check; | |
6236 | int skipped = 0; | |
6237 | mdk_rdev_t *rdev; | |
6238 | char *desc; | |
6239 | ||
6240 | /* just incase thread restarts... */ | |
6241 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6242 | return; | |
6243 | if (mddev->ro) /* never try to sync a read-only array */ | |
6244 | return; | |
6245 | ||
6246 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6247 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6248 | desc = "data-check"; | |
6249 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6250 | desc = "requested-resync"; | |
6251 | else | |
6252 | desc = "resync"; | |
6253 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6254 | desc = "reshape"; | |
6255 | else | |
6256 | desc = "recovery"; | |
6257 | ||
6258 | /* we overload curr_resync somewhat here. | |
6259 | * 0 == not engaged in resync at all | |
6260 | * 2 == checking that there is no conflict with another sync | |
6261 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6262 | * commense | |
6263 | * other == active in resync - this many blocks | |
6264 | * | |
6265 | * Before starting a resync we must have set curr_resync to | |
6266 | * 2, and then checked that every "conflicting" array has curr_resync | |
6267 | * less than ours. When we find one that is the same or higher | |
6268 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6269 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6270 | * This will mean we have to start checking from the beginning again. | |
6271 | * | |
6272 | */ | |
6273 | ||
6274 | do { | |
6275 | mddev->curr_resync = 2; | |
6276 | ||
6277 | try_again: | |
6278 | if (kthread_should_stop()) { | |
6279 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6280 | goto skip; | |
6281 | } | |
6282 | for_each_mddev(mddev2, tmp) { | |
6283 | if (mddev2 == mddev) | |
6284 | continue; | |
6285 | if (!mddev->parallel_resync | |
6286 | && mddev2->curr_resync | |
6287 | && match_mddev_units(mddev, mddev2)) { | |
6288 | DEFINE_WAIT(wq); | |
6289 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6290 | /* arbitrarily yield */ | |
6291 | mddev->curr_resync = 1; | |
6292 | wake_up(&resync_wait); | |
6293 | } | |
6294 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6295 | /* no need to wait here, we can wait the next | |
6296 | * time 'round when curr_resync == 2 | |
6297 | */ | |
6298 | continue; | |
6299 | /* We need to wait 'interruptible' so as not to | |
6300 | * contribute to the load average, and not to | |
6301 | * be caught by 'softlockup' | |
6302 | */ | |
6303 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
6304 | if (!kthread_should_stop() && | |
6305 | mddev2->curr_resync >= mddev->curr_resync) { | |
6306 | printk(KERN_INFO "md: delaying %s of %s" | |
6307 | " until %s has finished (they" | |
6308 | " share one or more physical units)\n", | |
6309 | desc, mdname(mddev), mdname(mddev2)); | |
6310 | mddev_put(mddev2); | |
6311 | if (signal_pending(current)) | |
6312 | flush_signals(current); | |
6313 | schedule(); | |
6314 | finish_wait(&resync_wait, &wq); | |
6315 | goto try_again; | |
6316 | } | |
6317 | finish_wait(&resync_wait, &wq); | |
6318 | } | |
6319 | } | |
6320 | } while (mddev->curr_resync < 2); | |
6321 | ||
6322 | j = 0; | |
6323 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6324 | /* resync follows the size requested by the personality, | |
6325 | * which defaults to physical size, but can be virtual size | |
6326 | */ | |
6327 | max_sectors = mddev->resync_max_sectors; | |
6328 | mddev->resync_mismatches = 0; | |
6329 | /* we don't use the checkpoint if there's a bitmap */ | |
6330 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6331 | j = mddev->resync_min; | |
6332 | else if (!mddev->bitmap) | |
6333 | j = mddev->recovery_cp; | |
6334 | ||
6335 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6336 | max_sectors = mddev->dev_sectors; | |
6337 | else { | |
6338 | /* recovery follows the physical size of devices */ | |
6339 | max_sectors = mddev->dev_sectors; | |
6340 | j = MaxSector; | |
6341 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
6342 | if (rdev->raid_disk >= 0 && | |
6343 | !test_bit(Faulty, &rdev->flags) && | |
6344 | !test_bit(In_sync, &rdev->flags) && | |
6345 | rdev->recovery_offset < j) | |
6346 | j = rdev->recovery_offset; | |
6347 | } | |
6348 | ||
6349 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); | |
6350 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6351 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
6352 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " | |
6353 | "(but not more than %d KB/sec) for %s.\n", | |
6354 | speed_max(mddev), desc); | |
6355 | ||
6356 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ | |
6357 | ||
6358 | io_sectors = 0; | |
6359 | for (m = 0; m < SYNC_MARKS; m++) { | |
6360 | mark[m] = jiffies; | |
6361 | mark_cnt[m] = io_sectors; | |
6362 | } | |
6363 | last_mark = 0; | |
6364 | mddev->resync_mark = mark[last_mark]; | |
6365 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6366 | ||
6367 | /* | |
6368 | * Tune reconstruction: | |
6369 | */ | |
6370 | window = 32*(PAGE_SIZE/512); | |
6371 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6372 | window/2,(unsigned long long) max_sectors/2); | |
6373 | ||
6374 | atomic_set(&mddev->recovery_active, 0); | |
6375 | last_check = 0; | |
6376 | ||
6377 | if (j>2) { | |
6378 | printk(KERN_INFO | |
6379 | "md: resuming %s of %s from checkpoint.\n", | |
6380 | desc, mdname(mddev)); | |
6381 | mddev->curr_resync = j; | |
6382 | } | |
6383 | ||
6384 | while (j < max_sectors) { | |
6385 | sector_t sectors; | |
6386 | ||
6387 | skipped = 0; | |
6388 | ||
6389 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
6390 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6391 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6392 | > (max_sectors >> 4)) || | |
6393 | (j - mddev->curr_resync_completed)*2 | |
6394 | >= mddev->resync_max - mddev->curr_resync_completed | |
6395 | )) { | |
6396 | /* time to update curr_resync_completed */ | |
6397 | blk_unplug(mddev->queue); | |
6398 | wait_event(mddev->recovery_wait, | |
6399 | atomic_read(&mddev->recovery_active) == 0); | |
6400 | mddev->curr_resync_completed = | |
6401 | mddev->curr_resync; | |
6402 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6403 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
6404 | } | |
6405 | ||
6406 | while (j >= mddev->resync_max && !kthread_should_stop()) { | |
6407 | /* As this condition is controlled by user-space, | |
6408 | * we can block indefinitely, so use '_interruptible' | |
6409 | * to avoid triggering warnings. | |
6410 | */ | |
6411 | flush_signals(current); /* just in case */ | |
6412 | wait_event_interruptible(mddev->recovery_wait, | |
6413 | mddev->resync_max > j | |
6414 | || kthread_should_stop()); | |
6415 | } | |
6416 | ||
6417 | if (kthread_should_stop()) | |
6418 | goto interrupted; | |
6419 | ||
6420 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
6421 | currspeed < speed_min(mddev)); | |
6422 | if (sectors == 0) { | |
6423 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6424 | goto out; | |
6425 | } | |
6426 | ||
6427 | if (!skipped) { /* actual IO requested */ | |
6428 | io_sectors += sectors; | |
6429 | atomic_add(sectors, &mddev->recovery_active); | |
6430 | } | |
6431 | ||
6432 | j += sectors; | |
6433 | if (j>1) mddev->curr_resync = j; | |
6434 | mddev->curr_mark_cnt = io_sectors; | |
6435 | if (last_check == 0) | |
6436 | /* this is the earliers that rebuilt will be | |
6437 | * visible in /proc/mdstat | |
6438 | */ | |
6439 | md_new_event(mddev); | |
6440 | ||
6441 | if (last_check + window > io_sectors || j == max_sectors) | |
6442 | continue; | |
6443 | ||
6444 | last_check = io_sectors; | |
6445 | ||
6446 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6447 | break; | |
6448 | ||
6449 | repeat: | |
6450 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6451 | /* step marks */ | |
6452 | int next = (last_mark+1) % SYNC_MARKS; | |
6453 | ||
6454 | mddev->resync_mark = mark[next]; | |
6455 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6456 | mark[next] = jiffies; | |
6457 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); | |
6458 | last_mark = next; | |
6459 | } | |
6460 | ||
6461 | ||
6462 | if (kthread_should_stop()) | |
6463 | goto interrupted; | |
6464 | ||
6465 | ||
6466 | /* | |
6467 | * this loop exits only if either when we are slower than | |
6468 | * the 'hard' speed limit, or the system was IO-idle for | |
6469 | * a jiffy. | |
6470 | * the system might be non-idle CPU-wise, but we only care | |
6471 | * about not overloading the IO subsystem. (things like an | |
6472 | * e2fsck being done on the RAID array should execute fast) | |
6473 | */ | |
6474 | blk_unplug(mddev->queue); | |
6475 | cond_resched(); | |
6476 | ||
6477 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 | |
6478 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
6479 | ||
6480 | if (currspeed > speed_min(mddev)) { | |
6481 | if ((currspeed > speed_max(mddev)) || | |
6482 | !is_mddev_idle(mddev, 0)) { | |
6483 | msleep(500); | |
6484 | goto repeat; | |
6485 | } | |
6486 | } | |
6487 | } | |
6488 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); | |
6489 | /* | |
6490 | * this also signals 'finished resyncing' to md_stop | |
6491 | */ | |
6492 | out: | |
6493 | blk_unplug(mddev->queue); | |
6494 | ||
6495 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6496 | ||
6497 | /* tell personality that we are finished */ | |
6498 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); | |
6499 | ||
6500 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && | |
6501 | mddev->curr_resync > 2) { | |
6502 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6503 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6504 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6505 | printk(KERN_INFO | |
6506 | "md: checkpointing %s of %s.\n", | |
6507 | desc, mdname(mddev)); | |
6508 | mddev->recovery_cp = mddev->curr_resync; | |
6509 | } | |
6510 | } else | |
6511 | mddev->recovery_cp = MaxSector; | |
6512 | } else { | |
6513 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6514 | mddev->curr_resync = MaxSector; | |
6515 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
6516 | if (rdev->raid_disk >= 0 && | |
6517 | !test_bit(Faulty, &rdev->flags) && | |
6518 | !test_bit(In_sync, &rdev->flags) && | |
6519 | rdev->recovery_offset < mddev->curr_resync) | |
6520 | rdev->recovery_offset = mddev->curr_resync; | |
6521 | } | |
6522 | } | |
6523 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
6524 | ||
6525 | skip: | |
6526 | mddev->curr_resync = 0; | |
6527 | mddev->curr_resync_completed = 0; | |
6528 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6529 | /* We completed so max setting can be forgotten. */ | |
6530 | mddev->resync_max = MaxSector; | |
6531 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
6532 | wake_up(&resync_wait); | |
6533 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6534 | md_wakeup_thread(mddev->thread); | |
6535 | return; | |
6536 | ||
6537 | interrupted: | |
6538 | /* | |
6539 | * got a signal, exit. | |
6540 | */ | |
6541 | printk(KERN_INFO | |
6542 | "md: md_do_sync() got signal ... exiting\n"); | |
6543 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6544 | goto out; | |
6545 | ||
6546 | } | |
6547 | EXPORT_SYMBOL_GPL(md_do_sync); | |
6548 | ||
6549 | ||
6550 | static int remove_and_add_spares(mddev_t *mddev) | |
6551 | { | |
6552 | mdk_rdev_t *rdev; | |
6553 | int spares = 0; | |
6554 | ||
6555 | mddev->curr_resync_completed = 0; | |
6556 | ||
6557 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
6558 | if (rdev->raid_disk >= 0 && | |
6559 | !test_bit(Blocked, &rdev->flags) && | |
6560 | (test_bit(Faulty, &rdev->flags) || | |
6561 | ! test_bit(In_sync, &rdev->flags)) && | |
6562 | atomic_read(&rdev->nr_pending)==0) { | |
6563 | if (mddev->pers->hot_remove_disk( | |
6564 | mddev, rdev->raid_disk)==0) { | |
6565 | char nm[20]; | |
6566 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6567 | sysfs_remove_link(&mddev->kobj, nm); | |
6568 | rdev->raid_disk = -1; | |
6569 | } | |
6570 | } | |
6571 | ||
6572 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { | |
6573 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
6574 | if (rdev->raid_disk >= 0 && | |
6575 | !test_bit(In_sync, &rdev->flags) && | |
6576 | !test_bit(Blocked, &rdev->flags)) | |
6577 | spares++; | |
6578 | if (rdev->raid_disk < 0 | |
6579 | && !test_bit(Faulty, &rdev->flags)) { | |
6580 | rdev->recovery_offset = 0; | |
6581 | if (mddev->pers-> | |
6582 | hot_add_disk(mddev, rdev) == 0) { | |
6583 | char nm[20]; | |
6584 | sprintf(nm, "rd%d", rdev->raid_disk); | |
6585 | if (sysfs_create_link(&mddev->kobj, | |
6586 | &rdev->kobj, nm)) | |
6587 | printk(KERN_WARNING | |
6588 | "md: cannot register " | |
6589 | "%s for %s\n", | |
6590 | nm, mdname(mddev)); | |
6591 | spares++; | |
6592 | md_new_event(mddev); | |
6593 | } else | |
6594 | break; | |
6595 | } | |
6596 | } | |
6597 | } | |
6598 | return spares; | |
6599 | } | |
6600 | /* | |
6601 | * This routine is regularly called by all per-raid-array threads to | |
6602 | * deal with generic issues like resync and super-block update. | |
6603 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6604 | * need this as they never do any recovery or update the superblock. | |
6605 | * | |
6606 | * It does not do any resync itself, but rather "forks" off other threads | |
6607 | * to do that as needed. | |
6608 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6609 | * "->recovery" and create a thread at ->sync_thread. | |
6610 | * When the thread finishes it sets MD_RECOVERY_DONE | |
6611 | * and wakeups up this thread which will reap the thread and finish up. | |
6612 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6613 | * | |
6614 | * The overall approach is: | |
6615 | * 1/ if the superblock needs updating, update it. | |
6616 | * 2/ If a recovery thread is running, don't do anything else. | |
6617 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6618 | * 4/ If there are any faulty devices, remove them. | |
6619 | * 5/ If array is degraded, try to add spares devices | |
6620 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6621 | */ | |
6622 | void md_check_recovery(mddev_t *mddev) | |
6623 | { | |
6624 | mdk_rdev_t *rdev; | |
6625 | ||
6626 | ||
6627 | if (mddev->bitmap) | |
6628 | bitmap_daemon_work(mddev->bitmap); | |
6629 | ||
6630 | if (mddev->ro) | |
6631 | return; | |
6632 | ||
6633 | if (signal_pending(current)) { | |
6634 | if (mddev->pers->sync_request && !mddev->external) { | |
6635 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
6636 | mdname(mddev)); | |
6637 | mddev->safemode = 2; | |
6638 | } | |
6639 | flush_signals(current); | |
6640 | } | |
6641 | ||
6642 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
6643 | return; | |
6644 | if ( ! ( | |
6645 | (mddev->flags && !mddev->external) || | |
6646 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || | |
6647 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || | |
6648 | (mddev->external == 0 && mddev->safemode == 1) || | |
6649 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
6650 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
6651 | )) | |
6652 | return; | |
6653 | ||
6654 | if (mddev_trylock(mddev)) { | |
6655 | int spares = 0; | |
6656 | ||
6657 | if (mddev->ro) { | |
6658 | /* Only thing we do on a ro array is remove | |
6659 | * failed devices. | |
6660 | */ | |
6661 | remove_and_add_spares(mddev); | |
6662 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6663 | goto unlock; | |
6664 | } | |
6665 | ||
6666 | if (!mddev->external) { | |
6667 | int did_change = 0; | |
6668 | spin_lock_irq(&mddev->write_lock); | |
6669 | if (mddev->safemode && | |
6670 | !atomic_read(&mddev->writes_pending) && | |
6671 | !mddev->in_sync && | |
6672 | mddev->recovery_cp == MaxSector) { | |
6673 | mddev->in_sync = 1; | |
6674 | did_change = 1; | |
6675 | if (mddev->persistent) | |
6676 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6677 | } | |
6678 | if (mddev->safemode == 1) | |
6679 | mddev->safemode = 0; | |
6680 | spin_unlock_irq(&mddev->write_lock); | |
6681 | if (did_change) | |
6682 | sysfs_notify_dirent(mddev->sysfs_state); | |
6683 | } | |
6684 | ||
6685 | if (mddev->flags) | |
6686 | md_update_sb(mddev, 0); | |
6687 | ||
6688 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
6689 | if (test_and_clear_bit(StateChanged, &rdev->flags)) | |
6690 | sysfs_notify_dirent(rdev->sysfs_state); | |
6691 | ||
6692 | ||
6693 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && | |
6694 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6695 | /* resync/recovery still happening */ | |
6696 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6697 | goto unlock; | |
6698 | } | |
6699 | if (mddev->sync_thread) { | |
6700 | /* resync has finished, collect result */ | |
6701 | md_unregister_thread(mddev->sync_thread); | |
6702 | mddev->sync_thread = NULL; | |
6703 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
6704 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
6705 | /* success...*/ | |
6706 | /* activate any spares */ | |
6707 | if (mddev->pers->spare_active(mddev)) | |
6708 | sysfs_notify(&mddev->kobj, NULL, | |
6709 | "degraded"); | |
6710 | } | |
6711 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
6712 | mddev->pers->finish_reshape) | |
6713 | mddev->pers->finish_reshape(mddev); | |
6714 | md_update_sb(mddev, 1); | |
6715 | ||
6716 | /* if array is no-longer degraded, then any saved_raid_disk | |
6717 | * information must be scrapped | |
6718 | */ | |
6719 | if (!mddev->degraded) | |
6720 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
6721 | rdev->saved_raid_disk = -1; | |
6722 | ||
6723 | mddev->recovery = 0; | |
6724 | /* flag recovery needed just to double check */ | |
6725 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6726 | sysfs_notify_dirent(mddev->sysfs_action); | |
6727 | md_new_event(mddev); | |
6728 | goto unlock; | |
6729 | } | |
6730 | /* Set RUNNING before clearing NEEDED to avoid | |
6731 | * any transients in the value of "sync_action". | |
6732 | */ | |
6733 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6734 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6735 | /* Clear some bits that don't mean anything, but | |
6736 | * might be left set | |
6737 | */ | |
6738 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6739 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6740 | ||
6741 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
6742 | goto unlock; | |
6743 | /* no recovery is running. | |
6744 | * remove any failed drives, then | |
6745 | * add spares if possible. | |
6746 | * Spare are also removed and re-added, to allow | |
6747 | * the personality to fail the re-add. | |
6748 | */ | |
6749 | ||
6750 | if (mddev->reshape_position != MaxSector) { | |
6751 | if (mddev->pers->check_reshape == NULL || | |
6752 | mddev->pers->check_reshape(mddev) != 0) | |
6753 | /* Cannot proceed */ | |
6754 | goto unlock; | |
6755 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
6756 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
6757 | } else if ((spares = remove_and_add_spares(mddev))) { | |
6758 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
6759 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
6760 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
6761 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
6762 | } else if (mddev->recovery_cp < MaxSector) { | |
6763 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
6764 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
6765 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
6766 | /* nothing to be done ... */ | |
6767 | goto unlock; | |
6768 | ||
6769 | if (mddev->pers->sync_request) { | |
6770 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { | |
6771 | /* We are adding a device or devices to an array | |
6772 | * which has the bitmap stored on all devices. | |
6773 | * So make sure all bitmap pages get written | |
6774 | */ | |
6775 | bitmap_write_all(mddev->bitmap); | |
6776 | } | |
6777 | mddev->sync_thread = md_register_thread(md_do_sync, | |
6778 | mddev, | |
6779 | "resync"); | |
6780 | if (!mddev->sync_thread) { | |
6781 | printk(KERN_ERR "%s: could not start resync" | |
6782 | " thread...\n", | |
6783 | mdname(mddev)); | |
6784 | /* leave the spares where they are, it shouldn't hurt */ | |
6785 | mddev->recovery = 0; | |
6786 | } else | |
6787 | md_wakeup_thread(mddev->sync_thread); | |
6788 | sysfs_notify_dirent(mddev->sysfs_action); | |
6789 | md_new_event(mddev); | |
6790 | } | |
6791 | unlock: | |
6792 | if (!mddev->sync_thread) { | |
6793 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6794 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6795 | &mddev->recovery)) | |
6796 | if (mddev->sysfs_action) | |
6797 | sysfs_notify_dirent(mddev->sysfs_action); | |
6798 | } | |
6799 | mddev_unlock(mddev); | |
6800 | } | |
6801 | } | |
6802 | ||
6803 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
6804 | { | |
6805 | sysfs_notify_dirent(rdev->sysfs_state); | |
6806 | wait_event_timeout(rdev->blocked_wait, | |
6807 | !test_bit(Blocked, &rdev->flags), | |
6808 | msecs_to_jiffies(5000)); | |
6809 | rdev_dec_pending(rdev, mddev); | |
6810 | } | |
6811 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6812 | ||
6813 | static int md_notify_reboot(struct notifier_block *this, | |
6814 | unsigned long code, void *x) | |
6815 | { | |
6816 | struct list_head *tmp; | |
6817 | mddev_t *mddev; | |
6818 | ||
6819 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6820 | ||
6821 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6822 | ||
6823 | for_each_mddev(mddev, tmp) | |
6824 | if (mddev_trylock(mddev)) { | |
6825 | /* Force a switch to readonly even array | |
6826 | * appears to still be in use. Hence | |
6827 | * the '100'. | |
6828 | */ | |
6829 | do_md_stop(mddev, 1, 100); | |
6830 | mddev_unlock(mddev); | |
6831 | } | |
6832 | /* | |
6833 | * certain more exotic SCSI devices are known to be | |
6834 | * volatile wrt too early system reboots. While the | |
6835 | * right place to handle this issue is the given | |
6836 | * driver, we do want to have a safe RAID driver ... | |
6837 | */ | |
6838 | mdelay(1000*1); | |
6839 | } | |
6840 | return NOTIFY_DONE; | |
6841 | } | |
6842 | ||
6843 | static struct notifier_block md_notifier = { | |
6844 | .notifier_call = md_notify_reboot, | |
6845 | .next = NULL, | |
6846 | .priority = INT_MAX, /* before any real devices */ | |
6847 | }; | |
6848 | ||
6849 | static void md_geninit(void) | |
6850 | { | |
6851 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
6852 | ||
6853 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); | |
6854 | } | |
6855 | ||
6856 | static int __init md_init(void) | |
6857 | { | |
6858 | if (register_blkdev(MD_MAJOR, "md")) | |
6859 | return -1; | |
6860 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
6861 | unregister_blkdev(MD_MAJOR, "md"); | |
6862 | return -1; | |
6863 | } | |
6864 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, | |
6865 | md_probe, NULL, NULL); | |
6866 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
6867 | md_probe, NULL, NULL); | |
6868 | ||
6869 | register_reboot_notifier(&md_notifier); | |
6870 | raid_table_header = register_sysctl_table(raid_root_table); | |
6871 | ||
6872 | md_geninit(); | |
6873 | return 0; | |
6874 | } | |
6875 | ||
6876 | ||
6877 | #ifndef MODULE | |
6878 | ||
6879 | /* | |
6880 | * Searches all registered partitions for autorun RAID arrays | |
6881 | * at boot time. | |
6882 | */ | |
6883 | ||
6884 | static LIST_HEAD(all_detected_devices); | |
6885 | struct detected_devices_node { | |
6886 | struct list_head list; | |
6887 | dev_t dev; | |
6888 | }; | |
6889 | ||
6890 | void md_autodetect_dev(dev_t dev) | |
6891 | { | |
6892 | struct detected_devices_node *node_detected_dev; | |
6893 | ||
6894 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
6895 | if (node_detected_dev) { | |
6896 | node_detected_dev->dev = dev; | |
6897 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
6898 | } else { | |
6899 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
6900 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
6901 | } | |
6902 | } | |
6903 | ||
6904 | ||
6905 | static void autostart_arrays(int part) | |
6906 | { | |
6907 | mdk_rdev_t *rdev; | |
6908 | struct detected_devices_node *node_detected_dev; | |
6909 | dev_t dev; | |
6910 | int i_scanned, i_passed; | |
6911 | ||
6912 | i_scanned = 0; | |
6913 | i_passed = 0; | |
6914 | ||
6915 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
6916 | ||
6917 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { | |
6918 | i_scanned++; | |
6919 | node_detected_dev = list_entry(all_detected_devices.next, | |
6920 | struct detected_devices_node, list); | |
6921 | list_del(&node_detected_dev->list); | |
6922 | dev = node_detected_dev->dev; | |
6923 | kfree(node_detected_dev); | |
6924 | rdev = md_import_device(dev,0, 90); | |
6925 | if (IS_ERR(rdev)) | |
6926 | continue; | |
6927 | ||
6928 | if (test_bit(Faulty, &rdev->flags)) { | |
6929 | MD_BUG(); | |
6930 | continue; | |
6931 | } | |
6932 | set_bit(AutoDetected, &rdev->flags); | |
6933 | list_add(&rdev->same_set, &pending_raid_disks); | |
6934 | i_passed++; | |
6935 | } | |
6936 | ||
6937 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
6938 | i_scanned, i_passed); | |
6939 | ||
6940 | autorun_devices(part); | |
6941 | } | |
6942 | ||
6943 | #endif /* !MODULE */ | |
6944 | ||
6945 | static __exit void md_exit(void) | |
6946 | { | |
6947 | mddev_t *mddev; | |
6948 | struct list_head *tmp; | |
6949 | ||
6950 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); | |
6951 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); | |
6952 | ||
6953 | unregister_blkdev(MD_MAJOR,"md"); | |
6954 | unregister_blkdev(mdp_major, "mdp"); | |
6955 | unregister_reboot_notifier(&md_notifier); | |
6956 | unregister_sysctl_table(raid_table_header); | |
6957 | remove_proc_entry("mdstat", NULL); | |
6958 | for_each_mddev(mddev, tmp) { | |
6959 | export_array(mddev); | |
6960 | mddev->hold_active = 0; | |
6961 | } | |
6962 | } | |
6963 | ||
6964 | subsys_initcall(md_init); | |
6965 | module_exit(md_exit) | |
6966 | ||
6967 | static int get_ro(char *buffer, struct kernel_param *kp) | |
6968 | { | |
6969 | return sprintf(buffer, "%d", start_readonly); | |
6970 | } | |
6971 | static int set_ro(const char *val, struct kernel_param *kp) | |
6972 | { | |
6973 | char *e; | |
6974 | int num = simple_strtoul(val, &e, 10); | |
6975 | if (*val && (*e == '\0' || *e == '\n')) { | |
6976 | start_readonly = num; | |
6977 | return 0; | |
6978 | } | |
6979 | return -EINVAL; | |
6980 | } | |
6981 | ||
6982 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); | |
6983 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6984 | ||
6985 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); | |
6986 | ||
6987 | EXPORT_SYMBOL(register_md_personality); | |
6988 | EXPORT_SYMBOL(unregister_md_personality); | |
6989 | EXPORT_SYMBOL(md_error); | |
6990 | EXPORT_SYMBOL(md_done_sync); | |
6991 | EXPORT_SYMBOL(md_write_start); | |
6992 | EXPORT_SYMBOL(md_write_end); | |
6993 | EXPORT_SYMBOL(md_register_thread); | |
6994 | EXPORT_SYMBOL(md_unregister_thread); | |
6995 | EXPORT_SYMBOL(md_wakeup_thread); | |
6996 | EXPORT_SYMBOL(md_check_recovery); | |
6997 | MODULE_LICENSE("GPL"); | |
6998 | MODULE_ALIAS("md"); | |
6999 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |