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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
6e9624b8 | 39 | #include <linux/smp_lock.h> |
1da177e4 | 40 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 41 | #include <linux/poll.h> |
16f17b39 | 42 | #include <linux/ctype.h> |
e7d2860b | 43 | #include <linux/string.h> |
fb4d8c76 N |
44 | #include <linux/hdreg.h> |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/random.h> | |
47 | #include <linux/reboot.h> | |
32a7627c | 48 | #include <linux/file.h> |
aa98aa31 | 49 | #include <linux/compat.h> |
25570727 | 50 | #include <linux/delay.h> |
bff61975 N |
51 | #include <linux/raid/md_p.h> |
52 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
ef740c37 | 55 | #include "bitmap.h" |
1da177e4 LT |
56 | |
57 | #define DEBUG 0 | |
58 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
59 | ||
60 | ||
61 | #ifndef MODULE | |
d710e138 | 62 | static void autostart_arrays(int part); |
1da177e4 LT |
63 | #endif |
64 | ||
2604b703 | 65 | static LIST_HEAD(pers_list); |
1da177e4 LT |
66 | static DEFINE_SPINLOCK(pers_lock); |
67 | ||
5e56341d AB |
68 | static void md_print_devices(void); |
69 | ||
90b08710 BS |
70 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
71 | ||
5e56341d AB |
72 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
73 | ||
1e50915f RB |
74 | /* |
75 | * Default number of read corrections we'll attempt on an rdev | |
76 | * before ejecting it from the array. We divide the read error | |
77 | * count by 2 for every hour elapsed between read errors. | |
78 | */ | |
79 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
80 | /* |
81 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
82 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
83 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 84 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
85 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
86 | * speed limit - in case reconstruction slows down your system despite | |
87 | * idle IO detection. | |
88 | * | |
89 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 90 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
91 | */ |
92 | ||
93 | static int sysctl_speed_limit_min = 1000; | |
94 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
95 | static inline int speed_min(mddev_t *mddev) |
96 | { | |
97 | return mddev->sync_speed_min ? | |
98 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
99 | } | |
100 | ||
101 | static inline int speed_max(mddev_t *mddev) | |
102 | { | |
103 | return mddev->sync_speed_max ? | |
104 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
105 | } | |
1da177e4 LT |
106 | |
107 | static struct ctl_table_header *raid_table_header; | |
108 | ||
109 | static ctl_table raid_table[] = { | |
110 | { | |
1da177e4 LT |
111 | .procname = "speed_limit_min", |
112 | .data = &sysctl_speed_limit_min, | |
113 | .maxlen = sizeof(int), | |
80ca3a44 | 114 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 115 | .proc_handler = proc_dointvec, |
1da177e4 LT |
116 | }, |
117 | { | |
1da177e4 LT |
118 | .procname = "speed_limit_max", |
119 | .data = &sysctl_speed_limit_max, | |
120 | .maxlen = sizeof(int), | |
80ca3a44 | 121 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 122 | .proc_handler = proc_dointvec, |
1da177e4 | 123 | }, |
894d2491 | 124 | { } |
1da177e4 LT |
125 | }; |
126 | ||
127 | static ctl_table raid_dir_table[] = { | |
128 | { | |
1da177e4 LT |
129 | .procname = "raid", |
130 | .maxlen = 0, | |
80ca3a44 | 131 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
132 | .child = raid_table, |
133 | }, | |
894d2491 | 134 | { } |
1da177e4 LT |
135 | }; |
136 | ||
137 | static ctl_table raid_root_table[] = { | |
138 | { | |
1da177e4 LT |
139 | .procname = "dev", |
140 | .maxlen = 0, | |
141 | .mode = 0555, | |
142 | .child = raid_dir_table, | |
143 | }, | |
894d2491 | 144 | { } |
1da177e4 LT |
145 | }; |
146 | ||
83d5cde4 | 147 | static const struct block_device_operations md_fops; |
1da177e4 | 148 | |
f91de92e N |
149 | static int start_readonly; |
150 | ||
d7603b7e N |
151 | /* |
152 | * We have a system wide 'event count' that is incremented | |
153 | * on any 'interesting' event, and readers of /proc/mdstat | |
154 | * can use 'poll' or 'select' to find out when the event | |
155 | * count increases. | |
156 | * | |
157 | * Events are: | |
158 | * start array, stop array, error, add device, remove device, | |
159 | * start build, activate spare | |
160 | */ | |
2989ddbd | 161 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 162 | static atomic_t md_event_count; |
29269553 | 163 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
164 | { |
165 | atomic_inc(&md_event_count); | |
166 | wake_up(&md_event_waiters); | |
167 | } | |
29269553 | 168 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 169 | |
c331eb04 N |
170 | /* Alternate version that can be called from interrupts |
171 | * when calling sysfs_notify isn't needed. | |
172 | */ | |
05381954 | 173 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
174 | { |
175 | atomic_inc(&md_event_count); | |
176 | wake_up(&md_event_waiters); | |
177 | } | |
178 | ||
1da177e4 LT |
179 | /* |
180 | * Enables to iterate over all existing md arrays | |
181 | * all_mddevs_lock protects this list. | |
182 | */ | |
183 | static LIST_HEAD(all_mddevs); | |
184 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
185 | ||
186 | ||
187 | /* | |
188 | * iterates through all used mddevs in the system. | |
189 | * We take care to grab the all_mddevs_lock whenever navigating | |
190 | * the list, and to always hold a refcount when unlocked. | |
191 | * Any code which breaks out of this loop while own | |
192 | * a reference to the current mddev and must mddev_put it. | |
193 | */ | |
29ac4aa3 | 194 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
195 | \ |
196 | for (({ spin_lock(&all_mddevs_lock); \ | |
197 | tmp = all_mddevs.next; \ | |
198 | mddev = NULL;}); \ | |
199 | ({ if (tmp != &all_mddevs) \ | |
200 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
201 | spin_unlock(&all_mddevs_lock); \ | |
202 | if (mddev) mddev_put(mddev); \ | |
203 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
204 | tmp != &all_mddevs;}); \ | |
205 | ({ spin_lock(&all_mddevs_lock); \ | |
206 | tmp = tmp->next;}) \ | |
207 | ) | |
208 | ||
209 | ||
409c57f3 N |
210 | /* Rather than calling directly into the personality make_request function, |
211 | * IO requests come here first so that we can check if the device is | |
212 | * being suspended pending a reconfiguration. | |
213 | * We hold a refcount over the call to ->make_request. By the time that | |
214 | * call has finished, the bio has been linked into some internal structure | |
215 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
216 | */ | |
217 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 218 | { |
49077326 | 219 | const int rw = bio_data_dir(bio); |
409c57f3 N |
220 | mddev_t *mddev = q->queuedata; |
221 | int rv; | |
49077326 N |
222 | int cpu; |
223 | ||
409c57f3 N |
224 | if (mddev == NULL || mddev->pers == NULL) { |
225 | bio_io_error(bio); | |
226 | return 0; | |
227 | } | |
228 | rcu_read_lock(); | |
a2826aa9 | 229 | if (mddev->suspended || mddev->barrier) { |
409c57f3 N |
230 | DEFINE_WAIT(__wait); |
231 | for (;;) { | |
232 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
233 | TASK_UNINTERRUPTIBLE); | |
a2826aa9 | 234 | if (!mddev->suspended && !mddev->barrier) |
409c57f3 N |
235 | break; |
236 | rcu_read_unlock(); | |
237 | schedule(); | |
238 | rcu_read_lock(); | |
239 | } | |
240 | finish_wait(&mddev->sb_wait, &__wait); | |
241 | } | |
242 | atomic_inc(&mddev->active_io); | |
243 | rcu_read_unlock(); | |
49077326 | 244 | |
21a52c6d | 245 | rv = mddev->pers->make_request(mddev, bio); |
49077326 N |
246 | |
247 | cpu = part_stat_lock(); | |
248 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
249 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], | |
250 | bio_sectors(bio)); | |
251 | part_stat_unlock(); | |
252 | ||
409c57f3 N |
253 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
254 | wake_up(&mddev->sb_wait); | |
255 | ||
256 | return rv; | |
257 | } | |
258 | ||
9e35b99c N |
259 | /* mddev_suspend makes sure no new requests are submitted |
260 | * to the device, and that any requests that have been submitted | |
261 | * are completely handled. | |
262 | * Once ->stop is called and completes, the module will be completely | |
263 | * unused. | |
264 | */ | |
390ee602 | 265 | void mddev_suspend(mddev_t *mddev) |
409c57f3 N |
266 | { |
267 | BUG_ON(mddev->suspended); | |
268 | mddev->suspended = 1; | |
269 | synchronize_rcu(); | |
270 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
271 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 272 | } |
390ee602 | 273 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 274 | |
390ee602 | 275 | void mddev_resume(mddev_t *mddev) |
409c57f3 N |
276 | { |
277 | mddev->suspended = 0; | |
278 | wake_up(&mddev->sb_wait); | |
279 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 | 280 | } |
390ee602 | 281 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 282 | |
3fa841d7 N |
283 | int mddev_congested(mddev_t *mddev, int bits) |
284 | { | |
a2826aa9 N |
285 | if (mddev->barrier) |
286 | return 1; | |
3fa841d7 N |
287 | return mddev->suspended; |
288 | } | |
289 | EXPORT_SYMBOL(mddev_congested); | |
290 | ||
a2826aa9 N |
291 | /* |
292 | * Generic barrier handling for md | |
293 | */ | |
294 | ||
295 | #define POST_REQUEST_BARRIER ((void*)1) | |
296 | ||
297 | static void md_end_barrier(struct bio *bio, int err) | |
298 | { | |
299 | mdk_rdev_t *rdev = bio->bi_private; | |
300 | mddev_t *mddev = rdev->mddev; | |
301 | if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER) | |
302 | set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags); | |
303 | ||
304 | rdev_dec_pending(rdev, mddev); | |
305 | ||
306 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
307 | if (mddev->barrier == POST_REQUEST_BARRIER) { | |
308 | /* This was a post-request barrier */ | |
309 | mddev->barrier = NULL; | |
310 | wake_up(&mddev->sb_wait); | |
311 | } else | |
312 | /* The pre-request barrier has finished */ | |
313 | schedule_work(&mddev->barrier_work); | |
314 | } | |
315 | bio_put(bio); | |
316 | } | |
317 | ||
318 | static void submit_barriers(mddev_t *mddev) | |
319 | { | |
320 | mdk_rdev_t *rdev; | |
321 | ||
322 | rcu_read_lock(); | |
323 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
324 | if (rdev->raid_disk >= 0 && | |
325 | !test_bit(Faulty, &rdev->flags)) { | |
326 | /* Take two references, one is dropped | |
327 | * when request finishes, one after | |
328 | * we reclaim rcu_read_lock | |
329 | */ | |
330 | struct bio *bi; | |
331 | atomic_inc(&rdev->nr_pending); | |
332 | atomic_inc(&rdev->nr_pending); | |
333 | rcu_read_unlock(); | |
334 | bi = bio_alloc(GFP_KERNEL, 0); | |
335 | bi->bi_end_io = md_end_barrier; | |
336 | bi->bi_private = rdev; | |
337 | bi->bi_bdev = rdev->bdev; | |
338 | atomic_inc(&mddev->flush_pending); | |
339 | submit_bio(WRITE_BARRIER, bi); | |
340 | rcu_read_lock(); | |
341 | rdev_dec_pending(rdev, mddev); | |
342 | } | |
343 | rcu_read_unlock(); | |
344 | } | |
345 | ||
346 | static void md_submit_barrier(struct work_struct *ws) | |
347 | { | |
348 | mddev_t *mddev = container_of(ws, mddev_t, barrier_work); | |
349 | struct bio *bio = mddev->barrier; | |
350 | ||
351 | atomic_set(&mddev->flush_pending, 1); | |
352 | ||
353 | if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags)) | |
354 | bio_endio(bio, -EOPNOTSUPP); | |
355 | else if (bio->bi_size == 0) | |
356 | /* an empty barrier - all done */ | |
357 | bio_endio(bio, 0); | |
358 | else { | |
7b6d91da | 359 | bio->bi_rw &= ~REQ_HARDBARRIER; |
21a52c6d | 360 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 N |
361 | generic_make_request(bio); |
362 | mddev->barrier = POST_REQUEST_BARRIER; | |
363 | submit_barriers(mddev); | |
364 | } | |
365 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
366 | mddev->barrier = NULL; | |
367 | wake_up(&mddev->sb_wait); | |
368 | } | |
369 | } | |
370 | ||
371 | void md_barrier_request(mddev_t *mddev, struct bio *bio) | |
372 | { | |
373 | spin_lock_irq(&mddev->write_lock); | |
374 | wait_event_lock_irq(mddev->sb_wait, | |
375 | !mddev->barrier, | |
376 | mddev->write_lock, /*nothing*/); | |
377 | mddev->barrier = bio; | |
378 | spin_unlock_irq(&mddev->write_lock); | |
379 | ||
380 | atomic_set(&mddev->flush_pending, 1); | |
381 | INIT_WORK(&mddev->barrier_work, md_submit_barrier); | |
382 | ||
383 | submit_barriers(mddev); | |
384 | ||
385 | if (atomic_dec_and_test(&mddev->flush_pending)) | |
386 | schedule_work(&mddev->barrier_work); | |
387 | } | |
388 | EXPORT_SYMBOL(md_barrier_request); | |
409c57f3 | 389 | |
2ac87401 N |
390 | /* Support for plugging. |
391 | * This mirrors the plugging support in request_queue, but does not | |
392 | * require having a whole queue | |
393 | */ | |
394 | static void plugger_work(struct work_struct *work) | |
395 | { | |
396 | struct plug_handle *plug = | |
397 | container_of(work, struct plug_handle, unplug_work); | |
398 | plug->unplug_fn(plug); | |
399 | } | |
400 | static void plugger_timeout(unsigned long data) | |
401 | { | |
402 | struct plug_handle *plug = (void *)data; | |
403 | kblockd_schedule_work(NULL, &plug->unplug_work); | |
404 | } | |
405 | void plugger_init(struct plug_handle *plug, | |
406 | void (*unplug_fn)(struct plug_handle *)) | |
407 | { | |
408 | plug->unplug_flag = 0; | |
409 | plug->unplug_fn = unplug_fn; | |
410 | init_timer(&plug->unplug_timer); | |
411 | plug->unplug_timer.function = plugger_timeout; | |
412 | plug->unplug_timer.data = (unsigned long)plug; | |
413 | INIT_WORK(&plug->unplug_work, plugger_work); | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(plugger_init); | |
416 | ||
417 | void plugger_set_plug(struct plug_handle *plug) | |
418 | { | |
419 | if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag)) | |
420 | mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1); | |
421 | } | |
422 | EXPORT_SYMBOL_GPL(plugger_set_plug); | |
423 | ||
424 | int plugger_remove_plug(struct plug_handle *plug) | |
425 | { | |
426 | if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) { | |
427 | del_timer(&plug->unplug_timer); | |
428 | return 1; | |
429 | } else | |
430 | return 0; | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(plugger_remove_plug); | |
433 | ||
434 | ||
1da177e4 LT |
435 | static inline mddev_t *mddev_get(mddev_t *mddev) |
436 | { | |
437 | atomic_inc(&mddev->active); | |
438 | return mddev; | |
439 | } | |
440 | ||
5fd3a17e | 441 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 442 | |
1da177e4 LT |
443 | static void mddev_put(mddev_t *mddev) |
444 | { | |
445 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
446 | return; | |
d3374825 | 447 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
448 | mddev->ctime == 0 && !mddev->hold_active) { |
449 | /* Array is not configured at all, and not held active, | |
450 | * so destroy it */ | |
1da177e4 | 451 | list_del(&mddev->all_mddevs); |
d3374825 N |
452 | if (mddev->gendisk) { |
453 | /* we did a probe so need to clean up. | |
454 | * Call schedule_work inside the spinlock | |
455 | * so that flush_scheduled_work() after | |
456 | * mddev_find will succeed in waiting for the | |
457 | * work to be done. | |
458 | */ | |
459 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
460 | schedule_work(&mddev->del_work); | |
461 | } else | |
462 | kfree(mddev); | |
463 | } | |
464 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
465 | } |
466 | ||
390ee602 | 467 | void mddev_init(mddev_t *mddev) |
fafd7fb0 N |
468 | { |
469 | mutex_init(&mddev->open_mutex); | |
470 | mutex_init(&mddev->reconfig_mutex); | |
471 | mutex_init(&mddev->bitmap_info.mutex); | |
472 | INIT_LIST_HEAD(&mddev->disks); | |
473 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
474 | init_timer(&mddev->safemode_timer); | |
475 | atomic_set(&mddev->active, 1); | |
476 | atomic_set(&mddev->openers, 0); | |
477 | atomic_set(&mddev->active_io, 0); | |
478 | spin_lock_init(&mddev->write_lock); | |
479 | atomic_set(&mddev->flush_pending, 0); | |
480 | init_waitqueue_head(&mddev->sb_wait); | |
481 | init_waitqueue_head(&mddev->recovery_wait); | |
482 | mddev->reshape_position = MaxSector; | |
483 | mddev->resync_min = 0; | |
484 | mddev->resync_max = MaxSector; | |
485 | mddev->level = LEVEL_NONE; | |
486 | } | |
390ee602 | 487 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 488 | |
1da177e4 LT |
489 | static mddev_t * mddev_find(dev_t unit) |
490 | { | |
491 | mddev_t *mddev, *new = NULL; | |
492 | ||
493 | retry: | |
494 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
495 | |
496 | if (unit) { | |
497 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
498 | if (mddev->unit == unit) { | |
499 | mddev_get(mddev); | |
500 | spin_unlock(&all_mddevs_lock); | |
501 | kfree(new); | |
502 | return mddev; | |
503 | } | |
504 | ||
505 | if (new) { | |
506 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 507 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
508 | new->hold_active = UNTIL_IOCTL; |
509 | return new; | |
1da177e4 | 510 | } |
efeb53c0 N |
511 | } else if (new) { |
512 | /* find an unused unit number */ | |
513 | static int next_minor = 512; | |
514 | int start = next_minor; | |
515 | int is_free = 0; | |
516 | int dev = 0; | |
517 | while (!is_free) { | |
518 | dev = MKDEV(MD_MAJOR, next_minor); | |
519 | next_minor++; | |
520 | if (next_minor > MINORMASK) | |
521 | next_minor = 0; | |
522 | if (next_minor == start) { | |
523 | /* Oh dear, all in use. */ | |
524 | spin_unlock(&all_mddevs_lock); | |
525 | kfree(new); | |
526 | return NULL; | |
527 | } | |
528 | ||
529 | is_free = 1; | |
530 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
531 | if (mddev->unit == dev) { | |
532 | is_free = 0; | |
533 | break; | |
534 | } | |
535 | } | |
536 | new->unit = dev; | |
537 | new->md_minor = MINOR(dev); | |
538 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
539 | list_add(&new->all_mddevs, &all_mddevs); |
540 | spin_unlock(&all_mddevs_lock); | |
541 | return new; | |
542 | } | |
543 | spin_unlock(&all_mddevs_lock); | |
544 | ||
9ffae0cf | 545 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
546 | if (!new) |
547 | return NULL; | |
548 | ||
1da177e4 LT |
549 | new->unit = unit; |
550 | if (MAJOR(unit) == MD_MAJOR) | |
551 | new->md_minor = MINOR(unit); | |
552 | else | |
553 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
554 | ||
fafd7fb0 | 555 | mddev_init(new); |
1da177e4 | 556 | |
1da177e4 LT |
557 | goto retry; |
558 | } | |
559 | ||
560 | static inline int mddev_lock(mddev_t * mddev) | |
561 | { | |
df5b89b3 | 562 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
563 | } |
564 | ||
b522adcd DW |
565 | static inline int mddev_is_locked(mddev_t *mddev) |
566 | { | |
567 | return mutex_is_locked(&mddev->reconfig_mutex); | |
568 | } | |
569 | ||
1da177e4 LT |
570 | static inline int mddev_trylock(mddev_t * mddev) |
571 | { | |
df5b89b3 | 572 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
573 | } |
574 | ||
b6eb127d N |
575 | static struct attribute_group md_redundancy_group; |
576 | ||
a64c876f | 577 | static void mddev_unlock(mddev_t * mddev) |
1da177e4 | 578 | { |
a64c876f | 579 | if (mddev->to_remove) { |
b6eb127d N |
580 | /* These cannot be removed under reconfig_mutex as |
581 | * an access to the files will try to take reconfig_mutex | |
582 | * while holding the file unremovable, which leads to | |
583 | * a deadlock. | |
bb4f1e9d N |
584 | * So hold set sysfs_active while the remove in happeing, |
585 | * and anything else which might set ->to_remove or my | |
586 | * otherwise change the sysfs namespace will fail with | |
587 | * -EBUSY if sysfs_active is still set. | |
588 | * We set sysfs_active under reconfig_mutex and elsewhere | |
589 | * test it under the same mutex to ensure its correct value | |
590 | * is seen. | |
b6eb127d | 591 | */ |
a64c876f N |
592 | struct attribute_group *to_remove = mddev->to_remove; |
593 | mddev->to_remove = NULL; | |
bb4f1e9d | 594 | mddev->sysfs_active = 1; |
b6eb127d N |
595 | mutex_unlock(&mddev->reconfig_mutex); |
596 | ||
00bcb4ac N |
597 | if (mddev->kobj.sd) { |
598 | if (to_remove != &md_redundancy_group) | |
599 | sysfs_remove_group(&mddev->kobj, to_remove); | |
600 | if (mddev->pers == NULL || | |
601 | mddev->pers->sync_request == NULL) { | |
602 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
603 | if (mddev->sysfs_action) | |
604 | sysfs_put(mddev->sysfs_action); | |
605 | mddev->sysfs_action = NULL; | |
606 | } | |
a64c876f | 607 | } |
bb4f1e9d | 608 | mddev->sysfs_active = 0; |
b6eb127d N |
609 | } else |
610 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 611 | |
005eca5e | 612 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
613 | } |
614 | ||
2989ddbd | 615 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 616 | { |
159ec1fc | 617 | mdk_rdev_t *rdev; |
1da177e4 | 618 | |
159ec1fc | 619 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
620 | if (rdev->desc_nr == nr) |
621 | return rdev; | |
159ec1fc | 622 | |
1da177e4 LT |
623 | return NULL; |
624 | } | |
625 | ||
626 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
627 | { | |
1da177e4 LT |
628 | mdk_rdev_t *rdev; |
629 | ||
159ec1fc | 630 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
631 | if (rdev->bdev->bd_dev == dev) |
632 | return rdev; | |
159ec1fc | 633 | |
1da177e4 LT |
634 | return NULL; |
635 | } | |
636 | ||
d9d166c2 | 637 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
638 | { |
639 | struct mdk_personality *pers; | |
d9d166c2 N |
640 | list_for_each_entry(pers, &pers_list, list) { |
641 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 642 | return pers; |
d9d166c2 N |
643 | if (strcmp(pers->name, clevel)==0) |
644 | return pers; | |
645 | } | |
2604b703 N |
646 | return NULL; |
647 | } | |
648 | ||
b73df2d3 | 649 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 650 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 651 | { |
b73df2d3 AN |
652 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
653 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
654 | } |
655 | ||
1da177e4 LT |
656 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
657 | { | |
658 | if (rdev->sb_page) | |
659 | MD_BUG(); | |
660 | ||
661 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
662 | if (!rdev->sb_page) { | |
663 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 664 | return -ENOMEM; |
1da177e4 LT |
665 | } |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | static void free_disk_sb(mdk_rdev_t * rdev) | |
671 | { | |
672 | if (rdev->sb_page) { | |
2d1f3b5d | 673 | put_page(rdev->sb_page); |
1da177e4 LT |
674 | rdev->sb_loaded = 0; |
675 | rdev->sb_page = NULL; | |
0f420358 | 676 | rdev->sb_start = 0; |
dd8ac336 | 677 | rdev->sectors = 0; |
1da177e4 LT |
678 | } |
679 | } | |
680 | ||
681 | ||
6712ecf8 | 682 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
683 | { |
684 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 685 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 686 | |
3a0f5bbb N |
687 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
688 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
689 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
690 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 691 | md_error(mddev, rdev); |
3a0f5bbb | 692 | } |
7bfa19f2 | 693 | |
a9701a30 N |
694 | if (atomic_dec_and_test(&mddev->pending_writes)) |
695 | wake_up(&mddev->sb_wait); | |
f8b58edf | 696 | bio_put(bio); |
7bfa19f2 N |
697 | } |
698 | ||
6712ecf8 | 699 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
700 | { |
701 | struct bio *bio2 = bio->bi_private; | |
702 | mdk_rdev_t *rdev = bio2->bi_private; | |
703 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
704 | |
705 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
706 | error == -EOPNOTSUPP) { | |
707 | unsigned long flags; | |
708 | /* barriers don't appear to be supported :-( */ | |
709 | set_bit(BarriersNotsupp, &rdev->flags); | |
710 | mddev->barriers_work = 0; | |
711 | spin_lock_irqsave(&mddev->write_lock, flags); | |
712 | bio2->bi_next = mddev->biolist; | |
713 | mddev->biolist = bio2; | |
714 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
715 | wake_up(&mddev->sb_wait); | |
716 | bio_put(bio); | |
6712ecf8 N |
717 | } else { |
718 | bio_put(bio2); | |
719 | bio->bi_private = rdev; | |
720 | super_written(bio, error); | |
a9701a30 | 721 | } |
a9701a30 N |
722 | } |
723 | ||
7bfa19f2 N |
724 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
725 | sector_t sector, int size, struct page *page) | |
726 | { | |
727 | /* write first size bytes of page to sector of rdev | |
728 | * Increment mddev->pending_writes before returning | |
729 | * and decrement it on completion, waking up sb_wait | |
730 | * if zero is reached. | |
731 | * If an error occurred, call md_error | |
a9701a30 | 732 | * |
7b6d91da | 733 | * As we might need to resubmit the request if REQ_HARDBARRIER |
a9701a30 | 734 | * causes ENOTSUPP, we allocate a spare bio... |
7bfa19f2 N |
735 | */ |
736 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
7b6d91da | 737 | int rw = REQ_WRITE | REQ_SYNC | REQ_UNPLUG; |
7bfa19f2 N |
738 | |
739 | bio->bi_bdev = rdev->bdev; | |
740 | bio->bi_sector = sector; | |
741 | bio_add_page(bio, page, size, 0); | |
742 | bio->bi_private = rdev; | |
743 | bio->bi_end_io = super_written; | |
a9701a30 N |
744 | bio->bi_rw = rw; |
745 | ||
7bfa19f2 | 746 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
747 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
748 | struct bio *rbio; | |
7b6d91da | 749 | rw |= REQ_HARDBARRIER; |
a9701a30 N |
750 | rbio = bio_clone(bio, GFP_NOIO); |
751 | rbio->bi_private = bio; | |
752 | rbio->bi_end_io = super_written_barrier; | |
753 | submit_bio(rw, rbio); | |
754 | } else | |
755 | submit_bio(rw, bio); | |
756 | } | |
757 | ||
758 | void md_super_wait(mddev_t *mddev) | |
759 | { | |
760 | /* wait for all superblock writes that were scheduled to complete. | |
761 | * if any had to be retried (due to BARRIER problems), retry them | |
762 | */ | |
763 | DEFINE_WAIT(wq); | |
764 | for(;;) { | |
765 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
766 | if (atomic_read(&mddev->pending_writes)==0) | |
767 | break; | |
768 | while (mddev->biolist) { | |
769 | struct bio *bio; | |
770 | spin_lock_irq(&mddev->write_lock); | |
771 | bio = mddev->biolist; | |
772 | mddev->biolist = bio->bi_next ; | |
773 | bio->bi_next = NULL; | |
774 | spin_unlock_irq(&mddev->write_lock); | |
775 | submit_bio(bio->bi_rw, bio); | |
776 | } | |
777 | schedule(); | |
778 | } | |
779 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
780 | } |
781 | ||
6712ecf8 | 782 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 783 | { |
1da177e4 | 784 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
785 | } |
786 | ||
a654b9d8 | 787 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
788 | struct page *page, int rw) |
789 | { | |
baaa2c51 | 790 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
791 | struct completion event; |
792 | int ret; | |
793 | ||
7b6d91da | 794 | rw |= REQ_SYNC | REQ_UNPLUG; |
1da177e4 LT |
795 | |
796 | bio->bi_bdev = bdev; | |
797 | bio->bi_sector = sector; | |
798 | bio_add_page(bio, page, size, 0); | |
799 | init_completion(&event); | |
800 | bio->bi_private = &event; | |
801 | bio->bi_end_io = bi_complete; | |
802 | submit_bio(rw, bio); | |
803 | wait_for_completion(&event); | |
804 | ||
805 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
806 | bio_put(bio); | |
807 | return ret; | |
808 | } | |
a8745db2 | 809 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 810 | |
0002b271 | 811 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
812 | { |
813 | char b[BDEVNAME_SIZE]; | |
814 | if (!rdev->sb_page) { | |
815 | MD_BUG(); | |
816 | return -EINVAL; | |
817 | } | |
818 | if (rdev->sb_loaded) | |
819 | return 0; | |
820 | ||
821 | ||
0f420358 | 822 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
823 | goto fail; |
824 | rdev->sb_loaded = 1; | |
825 | return 0; | |
826 | ||
827 | fail: | |
828 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
829 | bdevname(rdev->bdev,b)); | |
830 | return -EINVAL; | |
831 | } | |
832 | ||
833 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
834 | { | |
05710466 AN |
835 | return sb1->set_uuid0 == sb2->set_uuid0 && |
836 | sb1->set_uuid1 == sb2->set_uuid1 && | |
837 | sb1->set_uuid2 == sb2->set_uuid2 && | |
838 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
839 | } |
840 | ||
1da177e4 LT |
841 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
842 | { | |
843 | int ret; | |
844 | mdp_super_t *tmp1, *tmp2; | |
845 | ||
846 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
847 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
848 | ||
849 | if (!tmp1 || !tmp2) { | |
850 | ret = 0; | |
35020f1a | 851 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
852 | goto abort; |
853 | } | |
854 | ||
855 | *tmp1 = *sb1; | |
856 | *tmp2 = *sb2; | |
857 | ||
858 | /* | |
859 | * nr_disks is not constant | |
860 | */ | |
861 | tmp1->nr_disks = 0; | |
862 | tmp2->nr_disks = 0; | |
863 | ||
ce0c8e05 | 864 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 865 | abort: |
990a8baf JJ |
866 | kfree(tmp1); |
867 | kfree(tmp2); | |
1da177e4 LT |
868 | return ret; |
869 | } | |
870 | ||
4d167f09 N |
871 | |
872 | static u32 md_csum_fold(u32 csum) | |
873 | { | |
874 | csum = (csum & 0xffff) + (csum >> 16); | |
875 | return (csum & 0xffff) + (csum >> 16); | |
876 | } | |
877 | ||
1da177e4 LT |
878 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
879 | { | |
4d167f09 N |
880 | u64 newcsum = 0; |
881 | u32 *sb32 = (u32*)sb; | |
882 | int i; | |
1da177e4 LT |
883 | unsigned int disk_csum, csum; |
884 | ||
885 | disk_csum = sb->sb_csum; | |
886 | sb->sb_csum = 0; | |
4d167f09 N |
887 | |
888 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
889 | newcsum += sb32[i]; | |
890 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
891 | ||
892 | ||
893 | #ifdef CONFIG_ALPHA | |
894 | /* This used to use csum_partial, which was wrong for several | |
895 | * reasons including that different results are returned on | |
896 | * different architectures. It isn't critical that we get exactly | |
897 | * the same return value as before (we always csum_fold before | |
898 | * testing, and that removes any differences). However as we | |
899 | * know that csum_partial always returned a 16bit value on | |
900 | * alphas, do a fold to maximise conformity to previous behaviour. | |
901 | */ | |
902 | sb->sb_csum = md_csum_fold(disk_csum); | |
903 | #else | |
1da177e4 | 904 | sb->sb_csum = disk_csum; |
4d167f09 | 905 | #endif |
1da177e4 LT |
906 | return csum; |
907 | } | |
908 | ||
909 | ||
910 | /* | |
911 | * Handle superblock details. | |
912 | * We want to be able to handle multiple superblock formats | |
913 | * so we have a common interface to them all, and an array of | |
914 | * different handlers. | |
915 | * We rely on user-space to write the initial superblock, and support | |
916 | * reading and updating of superblocks. | |
917 | * Interface methods are: | |
918 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
919 | * loads and validates a superblock on dev. | |
920 | * if refdev != NULL, compare superblocks on both devices | |
921 | * Return: | |
922 | * 0 - dev has a superblock that is compatible with refdev | |
923 | * 1 - dev has a superblock that is compatible and newer than refdev | |
924 | * so dev should be used as the refdev in future | |
925 | * -EINVAL superblock incompatible or invalid | |
926 | * -othererror e.g. -EIO | |
927 | * | |
928 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
929 | * Verify that dev is acceptable into mddev. | |
930 | * The first time, mddev->raid_disks will be 0, and data from | |
931 | * dev should be merged in. Subsequent calls check that dev | |
932 | * is new enough. Return 0 or -EINVAL | |
933 | * | |
934 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
935 | * Update the superblock for rdev with data in mddev | |
936 | * This does not write to disc. | |
937 | * | |
938 | */ | |
939 | ||
940 | struct super_type { | |
0cd17fec CW |
941 | char *name; |
942 | struct module *owner; | |
943 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
944 | int minor_version); | |
945 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
946 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
947 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 948 | sector_t num_sectors); |
1da177e4 LT |
949 | }; |
950 | ||
0894cc30 AN |
951 | /* |
952 | * Check that the given mddev has no bitmap. | |
953 | * | |
954 | * This function is called from the run method of all personalities that do not | |
955 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
956 | * has a bitmap. Otherwise, it returns 0. | |
957 | * | |
958 | */ | |
959 | int md_check_no_bitmap(mddev_t *mddev) | |
960 | { | |
c3d9714e | 961 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
962 | return 0; |
963 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
964 | mdname(mddev), mddev->pers->name); | |
965 | return 1; | |
966 | } | |
967 | EXPORT_SYMBOL(md_check_no_bitmap); | |
968 | ||
1da177e4 LT |
969 | /* |
970 | * load_super for 0.90.0 | |
971 | */ | |
972 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
973 | { | |
974 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
975 | mdp_super_t *sb; | |
976 | int ret; | |
1da177e4 LT |
977 | |
978 | /* | |
0f420358 | 979 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
980 | * it's at the end of the disk. |
981 | * | |
982 | * It also happens to be a multiple of 4Kb. | |
983 | */ | |
0f420358 | 984 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 985 | |
0002b271 | 986 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
987 | if (ret) return ret; |
988 | ||
989 | ret = -EINVAL; | |
990 | ||
991 | bdevname(rdev->bdev, b); | |
992 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
993 | ||
994 | if (sb->md_magic != MD_SB_MAGIC) { | |
995 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
996 | b); | |
997 | goto abort; | |
998 | } | |
999 | ||
1000 | if (sb->major_version != 0 || | |
f6705578 N |
1001 | sb->minor_version < 90 || |
1002 | sb->minor_version > 91) { | |
1da177e4 LT |
1003 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1004 | sb->major_version, sb->minor_version, | |
1005 | b); | |
1006 | goto abort; | |
1007 | } | |
1008 | ||
1009 | if (sb->raid_disks <= 0) | |
1010 | goto abort; | |
1011 | ||
4d167f09 | 1012 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1013 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1014 | b); | |
1015 | goto abort; | |
1016 | } | |
1017 | ||
1018 | rdev->preferred_minor = sb->md_minor; | |
1019 | rdev->data_offset = 0; | |
0002b271 | 1020 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
1021 | |
1022 | if (sb->level == LEVEL_MULTIPATH) | |
1023 | rdev->desc_nr = -1; | |
1024 | else | |
1025 | rdev->desc_nr = sb->this_disk.number; | |
1026 | ||
9a7b2b0f | 1027 | if (!refdev) { |
1da177e4 | 1028 | ret = 1; |
9a7b2b0f | 1029 | } else { |
1da177e4 LT |
1030 | __u64 ev1, ev2; |
1031 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
1032 | if (!uuid_equal(refsb, sb)) { | |
1033 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1034 | b, bdevname(refdev->bdev,b2)); | |
1035 | goto abort; | |
1036 | } | |
1037 | if (!sb_equal(refsb, sb)) { | |
1038 | printk(KERN_WARNING "md: %s has same UUID" | |
1039 | " but different superblock to %s\n", | |
1040 | b, bdevname(refdev->bdev, b2)); | |
1041 | goto abort; | |
1042 | } | |
1043 | ev1 = md_event(sb); | |
1044 | ev2 = md_event(refsb); | |
1045 | if (ev1 > ev2) | |
1046 | ret = 1; | |
1047 | else | |
1048 | ret = 0; | |
1049 | } | |
8190e754 | 1050 | rdev->sectors = rdev->sb_start; |
1da177e4 | 1051 | |
dd8ac336 | 1052 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
1053 | /* "this cannot possibly happen" ... */ |
1054 | ret = -EINVAL; | |
1055 | ||
1da177e4 LT |
1056 | abort: |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * validate_super for 0.90.0 | |
1062 | */ | |
1063 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1064 | { | |
1065 | mdp_disk_t *desc; | |
1066 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 1067 | __u64 ev1 = md_event(sb); |
1da177e4 | 1068 | |
41158c7e | 1069 | rdev->raid_disk = -1; |
c5d79adb N |
1070 | clear_bit(Faulty, &rdev->flags); |
1071 | clear_bit(In_sync, &rdev->flags); | |
1072 | clear_bit(WriteMostly, &rdev->flags); | |
1073 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1074 | ||
1da177e4 LT |
1075 | if (mddev->raid_disks == 0) { |
1076 | mddev->major_version = 0; | |
1077 | mddev->minor_version = sb->minor_version; | |
1078 | mddev->patch_version = sb->patch_version; | |
e691063a | 1079 | mddev->external = 0; |
9d8f0363 | 1080 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1081 | mddev->ctime = sb->ctime; |
1082 | mddev->utime = sb->utime; | |
1083 | mddev->level = sb->level; | |
d9d166c2 | 1084 | mddev->clevel[0] = 0; |
1da177e4 LT |
1085 | mddev->layout = sb->layout; |
1086 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1087 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1088 | mddev->events = ev1; |
c3d9714e N |
1089 | mddev->bitmap_info.offset = 0; |
1090 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1091 | |
f6705578 N |
1092 | if (mddev->minor_version >= 91) { |
1093 | mddev->reshape_position = sb->reshape_position; | |
1094 | mddev->delta_disks = sb->delta_disks; | |
1095 | mddev->new_level = sb->new_level; | |
1096 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1097 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1098 | } else { |
1099 | mddev->reshape_position = MaxSector; | |
1100 | mddev->delta_disks = 0; | |
1101 | mddev->new_level = mddev->level; | |
1102 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1103 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1104 | } |
1105 | ||
1da177e4 LT |
1106 | if (sb->state & (1<<MD_SB_CLEAN)) |
1107 | mddev->recovery_cp = MaxSector; | |
1108 | else { | |
1109 | if (sb->events_hi == sb->cp_events_hi && | |
1110 | sb->events_lo == sb->cp_events_lo) { | |
1111 | mddev->recovery_cp = sb->recovery_cp; | |
1112 | } else | |
1113 | mddev->recovery_cp = 0; | |
1114 | } | |
1115 | ||
1116 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1117 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1118 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1119 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1120 | ||
1121 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1122 | |
1123 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1124 | mddev->bitmap_info.file == NULL) |
1125 | mddev->bitmap_info.offset = | |
1126 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1127 | |
41158c7e | 1128 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1129 | /* Insist on good event counter while assembling, except |
1130 | * for spares (which don't need an event count) */ | |
1da177e4 | 1131 | ++ev1; |
be6800a7 N |
1132 | if (sb->disks[rdev->desc_nr].state & ( |
1133 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1134 | if (ev1 < mddev->events) | |
1135 | return -EINVAL; | |
41158c7e N |
1136 | } else if (mddev->bitmap) { |
1137 | /* if adding to array with a bitmap, then we can accept an | |
1138 | * older device ... but not too old. | |
1139 | */ | |
41158c7e N |
1140 | if (ev1 < mddev->bitmap->events_cleared) |
1141 | return 0; | |
07d84d10 N |
1142 | } else { |
1143 | if (ev1 < mddev->events) | |
1144 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1145 | return 0; | |
1146 | } | |
41158c7e | 1147 | |
1da177e4 | 1148 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1149 | desc = sb->disks + rdev->desc_nr; |
1150 | ||
1151 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1152 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1153 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1154 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1155 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1156 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1157 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1158 | /* active but not in sync implies recovery up to | |
1159 | * reshape position. We don't know exactly where | |
1160 | * that is, so set to zero for now */ | |
1161 | if (mddev->minor_version >= 91) { | |
1162 | rdev->recovery_offset = 0; | |
1163 | rdev->raid_disk = desc->raid_disk; | |
1164 | } | |
1da177e4 | 1165 | } |
8ddf9efe N |
1166 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1167 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1168 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1169 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1170 | return 0; |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * sync_super for 0.90.0 | |
1175 | */ | |
1176 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1177 | { | |
1178 | mdp_super_t *sb; | |
1da177e4 LT |
1179 | mdk_rdev_t *rdev2; |
1180 | int next_spare = mddev->raid_disks; | |
19133a42 | 1181 | |
1da177e4 LT |
1182 | |
1183 | /* make rdev->sb match mddev data.. | |
1184 | * | |
1185 | * 1/ zero out disks | |
1186 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1187 | * 3/ any empty disks < next_spare become removed | |
1188 | * | |
1189 | * disks[0] gets initialised to REMOVED because | |
1190 | * we cannot be sure from other fields if it has | |
1191 | * been initialised or not. | |
1192 | */ | |
1193 | int i; | |
1194 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1195 | ||
61181565 N |
1196 | rdev->sb_size = MD_SB_BYTES; |
1197 | ||
1da177e4 LT |
1198 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
1199 | ||
1200 | memset(sb, 0, sizeof(*sb)); | |
1201 | ||
1202 | sb->md_magic = MD_SB_MAGIC; | |
1203 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1204 | sb->patch_version = mddev->patch_version; |
1205 | sb->gvalid_words = 0; /* ignored */ | |
1206 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1207 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1208 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1209 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1210 | ||
1211 | sb->ctime = mddev->ctime; | |
1212 | sb->level = mddev->level; | |
58c0fed4 | 1213 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1214 | sb->raid_disks = mddev->raid_disks; |
1215 | sb->md_minor = mddev->md_minor; | |
e691063a | 1216 | sb->not_persistent = 0; |
1da177e4 LT |
1217 | sb->utime = mddev->utime; |
1218 | sb->state = 0; | |
1219 | sb->events_hi = (mddev->events>>32); | |
1220 | sb->events_lo = (u32)mddev->events; | |
1221 | ||
f6705578 N |
1222 | if (mddev->reshape_position == MaxSector) |
1223 | sb->minor_version = 90; | |
1224 | else { | |
1225 | sb->minor_version = 91; | |
1226 | sb->reshape_position = mddev->reshape_position; | |
1227 | sb->new_level = mddev->new_level; | |
1228 | sb->delta_disks = mddev->delta_disks; | |
1229 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1230 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1231 | } |
1232 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1233 | if (mddev->in_sync) |
1234 | { | |
1235 | sb->recovery_cp = mddev->recovery_cp; | |
1236 | sb->cp_events_hi = (mddev->events>>32); | |
1237 | sb->cp_events_lo = (u32)mddev->events; | |
1238 | if (mddev->recovery_cp == MaxSector) | |
1239 | sb->state = (1<< MD_SB_CLEAN); | |
1240 | } else | |
1241 | sb->recovery_cp = 0; | |
1242 | ||
1243 | sb->layout = mddev->layout; | |
9d8f0363 | 1244 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1245 | |
c3d9714e | 1246 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1247 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1248 | ||
1da177e4 | 1249 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1250 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1251 | mdp_disk_t *d; |
86e6ffdd | 1252 | int desc_nr; |
0261cd9f N |
1253 | int is_active = test_bit(In_sync, &rdev2->flags); |
1254 | ||
1255 | if (rdev2->raid_disk >= 0 && | |
1256 | sb->minor_version >= 91) | |
1257 | /* we have nowhere to store the recovery_offset, | |
1258 | * but if it is not below the reshape_position, | |
1259 | * we can piggy-back on that. | |
1260 | */ | |
1261 | is_active = 1; | |
1262 | if (rdev2->raid_disk < 0 || | |
1263 | test_bit(Faulty, &rdev2->flags)) | |
1264 | is_active = 0; | |
1265 | if (is_active) | |
86e6ffdd | 1266 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1267 | else |
86e6ffdd | 1268 | desc_nr = next_spare++; |
19133a42 | 1269 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1270 | d = &sb->disks[rdev2->desc_nr]; |
1271 | nr_disks++; | |
1272 | d->number = rdev2->desc_nr; | |
1273 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1274 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1275 | if (is_active) |
1da177e4 LT |
1276 | d->raid_disk = rdev2->raid_disk; |
1277 | else | |
1278 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1279 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1280 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1281 | else if (is_active) { |
1da177e4 | 1282 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1283 | if (test_bit(In_sync, &rdev2->flags)) |
1284 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1285 | active++; |
1286 | working++; | |
1287 | } else { | |
1288 | d->state = 0; | |
1289 | spare++; | |
1290 | working++; | |
1291 | } | |
8ddf9efe N |
1292 | if (test_bit(WriteMostly, &rdev2->flags)) |
1293 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1294 | } |
1da177e4 LT |
1295 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1296 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1297 | mdp_disk_t *d = &sb->disks[i]; | |
1298 | if (d->state == 0 && d->number == 0) { | |
1299 | d->number = i; | |
1300 | d->raid_disk = i; | |
1301 | d->state = (1<<MD_DISK_REMOVED); | |
1302 | d->state |= (1<<MD_DISK_FAULTY); | |
1303 | failed++; | |
1304 | } | |
1305 | } | |
1306 | sb->nr_disks = nr_disks; | |
1307 | sb->active_disks = active; | |
1308 | sb->working_disks = working; | |
1309 | sb->failed_disks = failed; | |
1310 | sb->spare_disks = spare; | |
1311 | ||
1312 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1313 | sb->sb_csum = calc_sb_csum(sb); | |
1314 | } | |
1315 | ||
0cd17fec CW |
1316 | /* |
1317 | * rdev_size_change for 0.90.0 | |
1318 | */ | |
1319 | static unsigned long long | |
15f4a5fd | 1320 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1321 | { |
58c0fed4 | 1322 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1323 | return 0; /* component must fit device */ |
c3d9714e | 1324 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1325 | return 0; /* can't move bitmap */ |
0f420358 | 1326 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1327 | if (!num_sectors || num_sectors > rdev->sb_start) |
1328 | num_sectors = rdev->sb_start; | |
0f420358 | 1329 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1330 | rdev->sb_page); |
1331 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1332 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1333 | } |
1334 | ||
1335 | ||
1da177e4 LT |
1336 | /* |
1337 | * version 1 superblock | |
1338 | */ | |
1339 | ||
1c05b4bc | 1340 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1341 | { |
1c05b4bc N |
1342 | __le32 disk_csum; |
1343 | u32 csum; | |
1da177e4 LT |
1344 | unsigned long long newcsum; |
1345 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1346 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1347 | int i; |
1348 | ||
1349 | disk_csum = sb->sb_csum; | |
1350 | sb->sb_csum = 0; | |
1351 | newcsum = 0; | |
1352 | for (i=0; size>=4; size -= 4 ) | |
1353 | newcsum += le32_to_cpu(*isuper++); | |
1354 | ||
1355 | if (size == 2) | |
1c05b4bc | 1356 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1357 | |
1358 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1359 | sb->sb_csum = disk_csum; | |
1360 | return cpu_to_le32(csum); | |
1361 | } | |
1362 | ||
1363 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1364 | { | |
1365 | struct mdp_superblock_1 *sb; | |
1366 | int ret; | |
0f420358 | 1367 | sector_t sb_start; |
1da177e4 | 1368 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1369 | int bmask; |
1da177e4 LT |
1370 | |
1371 | /* | |
0f420358 | 1372 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1373 | * It is always aligned to a 4K boundary and |
1374 | * depeding on minor_version, it can be: | |
1375 | * 0: At least 8K, but less than 12K, from end of device | |
1376 | * 1: At start of device | |
1377 | * 2: 4K from start of device. | |
1378 | */ | |
1379 | switch(minor_version) { | |
1380 | case 0: | |
0f420358 AN |
1381 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1382 | sb_start -= 8*2; | |
1383 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1384 | break; |
1385 | case 1: | |
0f420358 | 1386 | sb_start = 0; |
1da177e4 LT |
1387 | break; |
1388 | case 2: | |
0f420358 | 1389 | sb_start = 8; |
1da177e4 LT |
1390 | break; |
1391 | default: | |
1392 | return -EINVAL; | |
1393 | } | |
0f420358 | 1394 | rdev->sb_start = sb_start; |
1da177e4 | 1395 | |
0002b271 N |
1396 | /* superblock is rarely larger than 1K, but it can be larger, |
1397 | * and it is safe to read 4k, so we do that | |
1398 | */ | |
1399 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1400 | if (ret) return ret; |
1401 | ||
1402 | ||
1403 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1404 | ||
1405 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1406 | sb->major_version != cpu_to_le32(1) || | |
1407 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1408 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1409 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1410 | return -EINVAL; |
1411 | ||
1412 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1413 | printk("md: invalid superblock checksum on %s\n", | |
1414 | bdevname(rdev->bdev,b)); | |
1415 | return -EINVAL; | |
1416 | } | |
1417 | if (le64_to_cpu(sb->data_size) < 10) { | |
1418 | printk("md: data_size too small on %s\n", | |
1419 | bdevname(rdev->bdev,b)); | |
1420 | return -EINVAL; | |
1421 | } | |
e11e93fa | 1422 | |
1da177e4 LT |
1423 | rdev->preferred_minor = 0xffff; |
1424 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1425 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1426 | |
0002b271 | 1427 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1428 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1429 | if (rdev->sb_size & bmask) |
a1801f85 N |
1430 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1431 | ||
1432 | if (minor_version | |
0f420358 | 1433 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1434 | return -EINVAL; |
0002b271 | 1435 | |
31b65a0d N |
1436 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1437 | rdev->desc_nr = -1; | |
1438 | else | |
1439 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1440 | ||
9a7b2b0f | 1441 | if (!refdev) { |
8ed75463 | 1442 | ret = 1; |
9a7b2b0f | 1443 | } else { |
1da177e4 LT |
1444 | __u64 ev1, ev2; |
1445 | struct mdp_superblock_1 *refsb = | |
1446 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1447 | ||
1448 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1449 | sb->level != refsb->level || | |
1450 | sb->layout != refsb->layout || | |
1451 | sb->chunksize != refsb->chunksize) { | |
1452 | printk(KERN_WARNING "md: %s has strangely different" | |
1453 | " superblock to %s\n", | |
1454 | bdevname(rdev->bdev,b), | |
1455 | bdevname(refdev->bdev,b2)); | |
1456 | return -EINVAL; | |
1457 | } | |
1458 | ev1 = le64_to_cpu(sb->events); | |
1459 | ev2 = le64_to_cpu(refsb->events); | |
1460 | ||
1461 | if (ev1 > ev2) | |
8ed75463 N |
1462 | ret = 1; |
1463 | else | |
1464 | ret = 0; | |
1da177e4 | 1465 | } |
a1801f85 | 1466 | if (minor_version) |
dd8ac336 AN |
1467 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
1468 | le64_to_cpu(sb->data_offset); | |
1da177e4 | 1469 | else |
dd8ac336 AN |
1470 | rdev->sectors = rdev->sb_start; |
1471 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1472 | return -EINVAL; |
dd8ac336 | 1473 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1474 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1475 | return -EINVAL; |
8ed75463 | 1476 | return ret; |
1da177e4 LT |
1477 | } |
1478 | ||
1479 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1480 | { | |
1481 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1482 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1483 | |
41158c7e | 1484 | rdev->raid_disk = -1; |
c5d79adb N |
1485 | clear_bit(Faulty, &rdev->flags); |
1486 | clear_bit(In_sync, &rdev->flags); | |
1487 | clear_bit(WriteMostly, &rdev->flags); | |
1488 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1489 | ||
1da177e4 LT |
1490 | if (mddev->raid_disks == 0) { |
1491 | mddev->major_version = 1; | |
1492 | mddev->patch_version = 0; | |
e691063a | 1493 | mddev->external = 0; |
9d8f0363 | 1494 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1495 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1496 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1497 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1498 | mddev->clevel[0] = 0; |
1da177e4 LT |
1499 | mddev->layout = le32_to_cpu(sb->layout); |
1500 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1501 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1502 | mddev->events = ev1; |
c3d9714e N |
1503 | mddev->bitmap_info.offset = 0; |
1504 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1505 | |
1506 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1507 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1508 | ||
1509 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1510 | |
71c0805c | 1511 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1512 | mddev->bitmap_info.file == NULL ) |
1513 | mddev->bitmap_info.offset = | |
1514 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1515 | |
f6705578 N |
1516 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1517 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1518 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1519 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1520 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1521 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1522 | } else { |
1523 | mddev->reshape_position = MaxSector; | |
1524 | mddev->delta_disks = 0; | |
1525 | mddev->new_level = mddev->level; | |
1526 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1527 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1528 | } |
1529 | ||
41158c7e | 1530 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1531 | /* Insist of good event counter while assembling, except for |
1532 | * spares (which don't need an event count) */ | |
1da177e4 | 1533 | ++ev1; |
be6800a7 N |
1534 | if (rdev->desc_nr >= 0 && |
1535 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1536 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1537 | if (ev1 < mddev->events) | |
1538 | return -EINVAL; | |
41158c7e N |
1539 | } else if (mddev->bitmap) { |
1540 | /* If adding to array with a bitmap, then we can accept an | |
1541 | * older device, but not too old. | |
1542 | */ | |
41158c7e N |
1543 | if (ev1 < mddev->bitmap->events_cleared) |
1544 | return 0; | |
07d84d10 N |
1545 | } else { |
1546 | if (ev1 < mddev->events) | |
1547 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1548 | return 0; | |
1549 | } | |
1da177e4 LT |
1550 | if (mddev->level != LEVEL_MULTIPATH) { |
1551 | int role; | |
3673f305 N |
1552 | if (rdev->desc_nr < 0 || |
1553 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1554 | role = 0xffff; | |
1555 | rdev->desc_nr = -1; | |
1556 | } else | |
1557 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1558 | switch(role) { |
1559 | case 0xffff: /* spare */ | |
1da177e4 LT |
1560 | break; |
1561 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1562 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1563 | break; |
1564 | default: | |
5fd6c1dc N |
1565 | if ((le32_to_cpu(sb->feature_map) & |
1566 | MD_FEATURE_RECOVERY_OFFSET)) | |
1567 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1568 | else | |
1569 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1570 | rdev->raid_disk = role; |
1571 | break; | |
1572 | } | |
8ddf9efe N |
1573 | if (sb->devflags & WriteMostly1) |
1574 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1575 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1576 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1577 | |
1da177e4 LT |
1578 | return 0; |
1579 | } | |
1580 | ||
1581 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1582 | { | |
1583 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1584 | mdk_rdev_t *rdev2; |
1585 | int max_dev, i; | |
1586 | /* make rdev->sb match mddev and rdev data. */ | |
1587 | ||
1588 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1589 | ||
1590 | sb->feature_map = 0; | |
1591 | sb->pad0 = 0; | |
5fd6c1dc | 1592 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1593 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1594 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1595 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1596 | ||
1597 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1598 | sb->events = cpu_to_le64(mddev->events); | |
1599 | if (mddev->in_sync) | |
1600 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1601 | else | |
1602 | sb->resync_offset = cpu_to_le64(0); | |
1603 | ||
1c05b4bc | 1604 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1605 | |
f0ca340c | 1606 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1607 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1608 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1609 | sb->level = cpu_to_le32(mddev->level); |
1610 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1611 | |
c3d9714e N |
1612 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1613 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1614 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1615 | } |
5fd6c1dc N |
1616 | |
1617 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1618 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1619 | sb->feature_map |= |
1620 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1621 | sb->recovery_offset = | |
1622 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1623 | } |
1624 | ||
f6705578 N |
1625 | if (mddev->reshape_position != MaxSector) { |
1626 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1627 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1628 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1629 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1630 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1631 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1632 | } |
a654b9d8 | 1633 | |
1da177e4 | 1634 | max_dev = 0; |
159ec1fc | 1635 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1636 | if (rdev2->desc_nr+1 > max_dev) |
1637 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1638 | |
70471daf N |
1639 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1640 | int bmask; | |
a778b73f | 1641 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1642 | rdev->sb_size = max_dev * 2 + 256; |
1643 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1644 | if (rdev->sb_size & bmask) | |
1645 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
1646 | } | |
1da177e4 LT |
1647 | for (i=0; i<max_dev;i++) |
1648 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1649 | ||
159ec1fc | 1650 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1651 | i = rdev2->desc_nr; |
b2d444d7 | 1652 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1653 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1654 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1655 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1656 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1657 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1658 | else |
1659 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1660 | } | |
1661 | ||
1da177e4 LT |
1662 | sb->sb_csum = calc_sb_1_csum(sb); |
1663 | } | |
1664 | ||
0cd17fec | 1665 | static unsigned long long |
15f4a5fd | 1666 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1667 | { |
1668 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1669 | sector_t max_sectors; |
58c0fed4 | 1670 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1671 | return 0; /* component must fit device */ |
0f420358 | 1672 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1673 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1674 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1675 | max_sectors -= rdev->data_offset; | |
1676 | if (!num_sectors || num_sectors > max_sectors) | |
1677 | num_sectors = max_sectors; | |
c3d9714e | 1678 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1679 | /* minor version 0 with bitmap we can't move */ |
1680 | return 0; | |
1681 | } else { | |
1682 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1683 | sector_t sb_start; |
1684 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1685 | sb_start &= ~(sector_t)(4*2 - 1); | |
dd8ac336 | 1686 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1687 | if (!num_sectors || num_sectors > max_sectors) |
1688 | num_sectors = max_sectors; | |
0f420358 | 1689 | rdev->sb_start = sb_start; |
0cd17fec CW |
1690 | } |
1691 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1692 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1693 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1694 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1695 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1696 | rdev->sb_page); |
1697 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1698 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1699 | } |
1da177e4 | 1700 | |
75c96f85 | 1701 | static struct super_type super_types[] = { |
1da177e4 LT |
1702 | [0] = { |
1703 | .name = "0.90.0", | |
1704 | .owner = THIS_MODULE, | |
0cd17fec CW |
1705 | .load_super = super_90_load, |
1706 | .validate_super = super_90_validate, | |
1707 | .sync_super = super_90_sync, | |
1708 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1709 | }, |
1710 | [1] = { | |
1711 | .name = "md-1", | |
1712 | .owner = THIS_MODULE, | |
0cd17fec CW |
1713 | .load_super = super_1_load, |
1714 | .validate_super = super_1_validate, | |
1715 | .sync_super = super_1_sync, | |
1716 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1717 | }, |
1718 | }; | |
1da177e4 LT |
1719 | |
1720 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1721 | { | |
7dd5e7c3 | 1722 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1723 | |
4b80991c N |
1724 | rcu_read_lock(); |
1725 | rdev_for_each_rcu(rdev, mddev1) | |
1726 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1727 | if (rdev->bdev->bd_contains == |
4b80991c N |
1728 | rdev2->bdev->bd_contains) { |
1729 | rcu_read_unlock(); | |
7dd5e7c3 | 1730 | return 1; |
4b80991c N |
1731 | } |
1732 | rcu_read_unlock(); | |
1da177e4 LT |
1733 | return 0; |
1734 | } | |
1735 | ||
1736 | static LIST_HEAD(pending_raid_disks); | |
1737 | ||
ac5e7113 AN |
1738 | /* |
1739 | * Try to register data integrity profile for an mddev | |
1740 | * | |
1741 | * This is called when an array is started and after a disk has been kicked | |
1742 | * from the array. It only succeeds if all working and active component devices | |
1743 | * are integrity capable with matching profiles. | |
1744 | */ | |
1745 | int md_integrity_register(mddev_t *mddev) | |
1746 | { | |
1747 | mdk_rdev_t *rdev, *reference = NULL; | |
1748 | ||
1749 | if (list_empty(&mddev->disks)) | |
1750 | return 0; /* nothing to do */ | |
1751 | if (blk_get_integrity(mddev->gendisk)) | |
1752 | return 0; /* already registered */ | |
1753 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1754 | /* skip spares and non-functional disks */ | |
1755 | if (test_bit(Faulty, &rdev->flags)) | |
1756 | continue; | |
1757 | if (rdev->raid_disk < 0) | |
1758 | continue; | |
1759 | /* | |
1760 | * If at least one rdev is not integrity capable, we can not | |
1761 | * enable data integrity for the md device. | |
1762 | */ | |
1763 | if (!bdev_get_integrity(rdev->bdev)) | |
1764 | return -EINVAL; | |
1765 | if (!reference) { | |
1766 | /* Use the first rdev as the reference */ | |
1767 | reference = rdev; | |
1768 | continue; | |
1769 | } | |
1770 | /* does this rdev's profile match the reference profile? */ | |
1771 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1772 | rdev->bdev->bd_disk) < 0) | |
1773 | return -EINVAL; | |
1774 | } | |
1775 | /* | |
1776 | * All component devices are integrity capable and have matching | |
1777 | * profiles, register the common profile for the md device. | |
1778 | */ | |
1779 | if (blk_integrity_register(mddev->gendisk, | |
1780 | bdev_get_integrity(reference->bdev)) != 0) { | |
1781 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1782 | mdname(mddev)); | |
1783 | return -EINVAL; | |
1784 | } | |
1785 | printk(KERN_NOTICE "md: data integrity on %s enabled\n", | |
1786 | mdname(mddev)); | |
1787 | return 0; | |
1788 | } | |
1789 | EXPORT_SYMBOL(md_integrity_register); | |
1790 | ||
1791 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1792 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1793 | { |
3f9d99c1 | 1794 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1795 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1796 | |
ac5e7113 | 1797 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1798 | return; |
ac5e7113 | 1799 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1800 | return; |
ac5e7113 AN |
1801 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1802 | rdev->bdev->bd_disk) >= 0) | |
1803 | return; | |
1804 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1805 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1806 | } |
ac5e7113 | 1807 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1808 | |
1da177e4 LT |
1809 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1810 | { | |
7dd5e7c3 | 1811 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1812 | struct kobject *ko; |
1edf80d3 | 1813 | char *s; |
5e55e2f5 | 1814 | int err; |
1da177e4 LT |
1815 | |
1816 | if (rdev->mddev) { | |
1817 | MD_BUG(); | |
1818 | return -EINVAL; | |
1819 | } | |
11e2ede0 DW |
1820 | |
1821 | /* prevent duplicates */ | |
1822 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1823 | return -EEXIST; | |
1824 | ||
dd8ac336 AN |
1825 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1826 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1827 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1828 | if (mddev->pers) { |
1829 | /* Cannot change size, so fail | |
1830 | * If mddev->level <= 0, then we don't care | |
1831 | * about aligning sizes (e.g. linear) | |
1832 | */ | |
1833 | if (mddev->level > 0) | |
1834 | return -ENOSPC; | |
1835 | } else | |
dd8ac336 | 1836 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1837 | } |
1da177e4 LT |
1838 | |
1839 | /* Verify rdev->desc_nr is unique. | |
1840 | * If it is -1, assign a free number, else | |
1841 | * check number is not in use | |
1842 | */ | |
1843 | if (rdev->desc_nr < 0) { | |
1844 | int choice = 0; | |
1845 | if (mddev->pers) choice = mddev->raid_disks; | |
1846 | while (find_rdev_nr(mddev, choice)) | |
1847 | choice++; | |
1848 | rdev->desc_nr = choice; | |
1849 | } else { | |
1850 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1851 | return -EBUSY; | |
1852 | } | |
de01dfad N |
1853 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1854 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1855 | mdname(mddev), mddev->max_disks); | |
1856 | return -EBUSY; | |
1857 | } | |
19133a42 | 1858 | bdevname(rdev->bdev,b); |
649316b2 | 1859 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1860 | *s = '!'; |
649316b2 | 1861 | |
1da177e4 | 1862 | rdev->mddev = mddev; |
19133a42 | 1863 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1864 | |
b2d6db58 | 1865 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1866 | goto fail; |
86e6ffdd | 1867 | |
0762b8bd | 1868 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
1869 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
1870 | /* failure here is OK */; | |
1871 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 1872 | |
4b80991c | 1873 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1874 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1875 | |
1876 | /* May as well allow recovery to be retried once */ | |
1877 | mddev->recovery_disabled = 0; | |
3f9d99c1 | 1878 | |
1da177e4 | 1879 | return 0; |
5e55e2f5 N |
1880 | |
1881 | fail: | |
1882 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1883 | b, mdname(mddev)); | |
1884 | return err; | |
1da177e4 LT |
1885 | } |
1886 | ||
177a99b2 | 1887 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1888 | { |
1889 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1890 | kobject_del(&rdev->kobj); | |
177a99b2 | 1891 | kobject_put(&rdev->kobj); |
5792a285 N |
1892 | } |
1893 | ||
1da177e4 LT |
1894 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1895 | { | |
1896 | char b[BDEVNAME_SIZE]; | |
1897 | if (!rdev->mddev) { | |
1898 | MD_BUG(); | |
1899 | return; | |
1900 | } | |
5463c790 | 1901 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1902 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1903 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1904 | rdev->mddev = NULL; | |
86e6ffdd | 1905 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1906 | sysfs_put(rdev->sysfs_state); |
1907 | rdev->sysfs_state = NULL; | |
5792a285 | 1908 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1909 | * writing to 'remove' to "dev/state". We also need |
1910 | * to delay it due to rcu usage. | |
5792a285 | 1911 | */ |
4b80991c | 1912 | synchronize_rcu(); |
177a99b2 N |
1913 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1914 | kobject_get(&rdev->kobj); | |
5792a285 | 1915 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1916 | } |
1917 | ||
1918 | /* | |
1919 | * prevent the device from being mounted, repartitioned or | |
1920 | * otherwise reused by a RAID array (or any other kernel | |
1921 | * subsystem), by bd_claiming the device. | |
1922 | */ | |
c5d79adb | 1923 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1924 | { |
1925 | int err = 0; | |
1926 | struct block_device *bdev; | |
1927 | char b[BDEVNAME_SIZE]; | |
1928 | ||
2e7b651d | 1929 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1930 | if (IS_ERR(bdev)) { |
1931 | printk(KERN_ERR "md: could not open %s.\n", | |
1932 | __bdevname(dev, b)); | |
1933 | return PTR_ERR(bdev); | |
1934 | } | |
c5d79adb | 1935 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1936 | if (err) { |
1937 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1938 | bdevname(bdev, b)); | |
9a1c3542 | 1939 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1940 | return err; |
1941 | } | |
c5d79adb N |
1942 | if (!shared) |
1943 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1944 | rdev->bdev = bdev; |
1945 | return err; | |
1946 | } | |
1947 | ||
1948 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1949 | { | |
1950 | struct block_device *bdev = rdev->bdev; | |
1951 | rdev->bdev = NULL; | |
1952 | if (!bdev) | |
1953 | MD_BUG(); | |
1954 | bd_release(bdev); | |
9a1c3542 | 1955 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1956 | } |
1957 | ||
1958 | void md_autodetect_dev(dev_t dev); | |
1959 | ||
1960 | static void export_rdev(mdk_rdev_t * rdev) | |
1961 | { | |
1962 | char b[BDEVNAME_SIZE]; | |
1963 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1964 | bdevname(rdev->bdev,b)); | |
1965 | if (rdev->mddev) | |
1966 | MD_BUG(); | |
1967 | free_disk_sb(rdev); | |
1da177e4 | 1968 | #ifndef MODULE |
d0fae18f N |
1969 | if (test_bit(AutoDetected, &rdev->flags)) |
1970 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1971 | #endif |
1972 | unlock_rdev(rdev); | |
86e6ffdd | 1973 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1974 | } |
1975 | ||
1976 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1977 | { | |
1978 | unbind_rdev_from_array(rdev); | |
1979 | export_rdev(rdev); | |
1980 | } | |
1981 | ||
1982 | static void export_array(mddev_t *mddev) | |
1983 | { | |
159ec1fc | 1984 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1985 | |
d089c6af | 1986 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1987 | if (!rdev->mddev) { |
1988 | MD_BUG(); | |
1989 | continue; | |
1990 | } | |
1991 | kick_rdev_from_array(rdev); | |
1992 | } | |
1993 | if (!list_empty(&mddev->disks)) | |
1994 | MD_BUG(); | |
1995 | mddev->raid_disks = 0; | |
1996 | mddev->major_version = 0; | |
1997 | } | |
1998 | ||
1999 | static void print_desc(mdp_disk_t *desc) | |
2000 | { | |
2001 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2002 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2003 | } | |
2004 | ||
cd2ac932 | 2005 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2006 | { |
2007 | int i; | |
2008 | ||
2009 | printk(KERN_INFO | |
2010 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2011 | sb->major_version, sb->minor_version, sb->patch_version, | |
2012 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2013 | sb->ctime); | |
2014 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2015 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2016 | sb->md_minor, sb->layout, sb->chunk_size); | |
2017 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2018 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2019 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2020 | sb->failed_disks, sb->spare_disks, | |
2021 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2022 | ||
2023 | printk(KERN_INFO); | |
2024 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2025 | mdp_disk_t *desc; | |
2026 | ||
2027 | desc = sb->disks + i; | |
2028 | if (desc->number || desc->major || desc->minor || | |
2029 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2030 | printk(" D %2d: ", i); | |
2031 | print_desc(desc); | |
2032 | } | |
2033 | } | |
2034 | printk(KERN_INFO "md: THIS: "); | |
2035 | print_desc(&sb->this_disk); | |
cd2ac932 | 2036 | } |
1da177e4 | 2037 | |
cd2ac932 CR |
2038 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2039 | { | |
2040 | __u8 *uuid; | |
2041 | ||
2042 | uuid = sb->set_uuid; | |
ad361c98 | 2043 | printk(KERN_INFO |
7b75c2f8 | 2044 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2045 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2046 | le32_to_cpu(sb->major_version), |
2047 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2048 | uuid, |
cd2ac932 CR |
2049 | sb->set_name, |
2050 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2051 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2052 | ||
2053 | uuid = sb->device_uuid; | |
ad361c98 JP |
2054 | printk(KERN_INFO |
2055 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2056 | " RO:%llu\n" |
7b75c2f8 | 2057 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2058 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2059 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2060 | le32_to_cpu(sb->level), |
2061 | (unsigned long long)le64_to_cpu(sb->size), | |
2062 | le32_to_cpu(sb->raid_disks), | |
2063 | le32_to_cpu(sb->layout), | |
2064 | le32_to_cpu(sb->chunksize), | |
2065 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2066 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2067 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2068 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2069 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2070 | uuid, |
cd2ac932 CR |
2071 | sb->devflags, |
2072 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2073 | (unsigned long long)le64_to_cpu(sb->events), | |
2074 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2075 | le32_to_cpu(sb->sb_csum), | |
2076 | le32_to_cpu(sb->max_dev) | |
2077 | ); | |
1da177e4 LT |
2078 | } |
2079 | ||
cd2ac932 | 2080 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2081 | { |
2082 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2083 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2084 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2085 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2086 | rdev->desc_nr); | |
1da177e4 | 2087 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2088 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2089 | switch (major_version) { | |
2090 | case 0: | |
2091 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
2092 | break; | |
2093 | case 1: | |
2094 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
2095 | break; | |
2096 | } | |
1da177e4 LT |
2097 | } else |
2098 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2099 | } | |
2100 | ||
5e56341d | 2101 | static void md_print_devices(void) |
1da177e4 | 2102 | { |
159ec1fc | 2103 | struct list_head *tmp; |
1da177e4 LT |
2104 | mdk_rdev_t *rdev; |
2105 | mddev_t *mddev; | |
2106 | char b[BDEVNAME_SIZE]; | |
2107 | ||
2108 | printk("\n"); | |
2109 | printk("md: **********************************\n"); | |
2110 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2111 | printk("md: **********************************\n"); | |
29ac4aa3 | 2112 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2113 | |
32a7627c N |
2114 | if (mddev->bitmap) |
2115 | bitmap_print_sb(mddev->bitmap); | |
2116 | else | |
2117 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2118 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2119 | printk("<%s>", bdevname(rdev->bdev,b)); |
2120 | printk("\n"); | |
2121 | ||
159ec1fc | 2122 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2123 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2124 | } |
2125 | printk("md: **********************************\n"); | |
2126 | printk("\n"); | |
2127 | } | |
2128 | ||
2129 | ||
42543769 | 2130 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2131 | { |
42543769 N |
2132 | /* Update each superblock (in-memory image), but |
2133 | * if we are allowed to, skip spares which already | |
2134 | * have the right event counter, or have one earlier | |
2135 | * (which would mean they aren't being marked as dirty | |
2136 | * with the rest of the array) | |
2137 | */ | |
1da177e4 | 2138 | mdk_rdev_t *rdev; |
159ec1fc | 2139 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2140 | if (rdev->sb_events == mddev->events || |
2141 | (nospares && | |
2142 | rdev->raid_disk < 0 && | |
42543769 N |
2143 | rdev->sb_events+1 == mddev->events)) { |
2144 | /* Don't update this superblock */ | |
2145 | rdev->sb_loaded = 2; | |
2146 | } else { | |
2147 | super_types[mddev->major_version]. | |
2148 | sync_super(mddev, rdev); | |
2149 | rdev->sb_loaded = 1; | |
2150 | } | |
1da177e4 LT |
2151 | } |
2152 | } | |
2153 | ||
850b2b42 | 2154 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2155 | { |
1da177e4 | 2156 | mdk_rdev_t *rdev; |
06d91a5f | 2157 | int sync_req; |
42543769 | 2158 | int nospares = 0; |
1da177e4 | 2159 | |
1da177e4 | 2160 | repeat: |
3a3a5ddb N |
2161 | /* First make sure individual recovery_offsets are correct */ |
2162 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2163 | if (rdev->raid_disk >= 0 && | |
2164 | mddev->delta_disks >= 0 && | |
2165 | !test_bit(In_sync, &rdev->flags) && | |
2166 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2167 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2168 | ||
2169 | } | |
2170 | if (mddev->external || !mddev->persistent) { | |
2171 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2172 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
2173 | wake_up(&mddev->sb_wait); | |
2174 | return; | |
2175 | } | |
2176 | ||
a9701a30 | 2177 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2178 | |
3a3a5ddb N |
2179 | mddev->utime = get_seconds(); |
2180 | ||
850b2b42 N |
2181 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2182 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
2183 | force_change = 1; | |
2184 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2185 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2186 | * though if events isn't the right even/odd, we will have to do | |
2187 | * spares after all | |
2188 | */ | |
2189 | nospares = 1; | |
2190 | if (force_change) | |
2191 | nospares = 0; | |
2192 | if (mddev->degraded) | |
84692195 N |
2193 | /* If the array is degraded, then skipping spares is both |
2194 | * dangerous and fairly pointless. | |
2195 | * Dangerous because a device that was removed from the array | |
2196 | * might have a event_count that still looks up-to-date, | |
2197 | * so it can be re-added without a resync. | |
2198 | * Pointless because if there are any spares to skip, | |
2199 | * then a recovery will happen and soon that array won't | |
2200 | * be degraded any more and the spare can go back to sleep then. | |
2201 | */ | |
850b2b42 | 2202 | nospares = 0; |
84692195 | 2203 | |
06d91a5f | 2204 | sync_req = mddev->in_sync; |
42543769 N |
2205 | |
2206 | /* If this is just a dirty<->clean transition, and the array is clean | |
2207 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2208 | if (nospares |
42543769 | 2209 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2210 | && mddev->can_decrease_events |
2211 | && mddev->events != 1) { | |
42543769 | 2212 | mddev->events--; |
a8707c08 N |
2213 | mddev->can_decrease_events = 0; |
2214 | } else { | |
42543769 N |
2215 | /* otherwise we have to go forward and ... */ |
2216 | mddev->events ++; | |
a8707c08 | 2217 | mddev->can_decrease_events = nospares; |
42543769 | 2218 | } |
1da177e4 LT |
2219 | |
2220 | if (!mddev->events) { | |
2221 | /* | |
2222 | * oops, this 64-bit counter should never wrap. | |
2223 | * Either we are in around ~1 trillion A.C., assuming | |
2224 | * 1 reboot per second, or we have a bug: | |
2225 | */ | |
2226 | MD_BUG(); | |
2227 | mddev->events --; | |
2228 | } | |
e691063a | 2229 | sync_sbs(mddev, nospares); |
a9701a30 | 2230 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2231 | |
2232 | dprintk(KERN_INFO | |
2233 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2234 | mdname(mddev),mddev->in_sync); | |
2235 | ||
4ad13663 | 2236 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2237 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2238 | char b[BDEVNAME_SIZE]; |
2239 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2240 | if (rdev->sb_loaded != 1) |
2241 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2242 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2243 | dprintk("(skipping faulty "); |
2244 | ||
2245 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2246 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2247 | md_super_write(mddev,rdev, |
0f420358 | 2248 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2249 | rdev->sb_page); |
2250 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2251 | bdevname(rdev->bdev,b), | |
0f420358 | 2252 | (unsigned long long)rdev->sb_start); |
42543769 | 2253 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2254 | |
1da177e4 LT |
2255 | } else |
2256 | dprintk(")\n"); | |
7bfa19f2 | 2257 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2258 | /* only need to write one superblock... */ |
2259 | break; | |
2260 | } | |
a9701a30 | 2261 | md_super_wait(mddev); |
850b2b42 | 2262 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2263 | |
a9701a30 | 2264 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2265 | if (mddev->in_sync != sync_req || |
2266 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2267 | /* have to write it out again */ |
a9701a30 | 2268 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2269 | goto repeat; |
2270 | } | |
850b2b42 | 2271 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2272 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2273 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2274 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2275 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2276 | |
1da177e4 LT |
2277 | } |
2278 | ||
7f6ce769 | 2279 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2280 | * We want to accept with case. For this we use cmd_match. |
2281 | */ | |
2282 | static int cmd_match(const char *cmd, const char *str) | |
2283 | { | |
2284 | /* See if cmd, written into a sysfs file, matches | |
2285 | * str. They must either be the same, or cmd can | |
2286 | * have a trailing newline | |
2287 | */ | |
2288 | while (*cmd && *str && *cmd == *str) { | |
2289 | cmd++; | |
2290 | str++; | |
2291 | } | |
2292 | if (*cmd == '\n') | |
2293 | cmd++; | |
2294 | if (*str || *cmd) | |
2295 | return 0; | |
2296 | return 1; | |
2297 | } | |
2298 | ||
86e6ffdd N |
2299 | struct rdev_sysfs_entry { |
2300 | struct attribute attr; | |
2301 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2302 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2303 | }; | |
2304 | ||
2305 | static ssize_t | |
96de1e66 | 2306 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2307 | { |
2308 | char *sep = ""; | |
20a49ff6 | 2309 | size_t len = 0; |
86e6ffdd | 2310 | |
b2d444d7 | 2311 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2312 | len+= sprintf(page+len, "%sfaulty",sep); |
2313 | sep = ","; | |
2314 | } | |
b2d444d7 | 2315 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2316 | len += sprintf(page+len, "%sin_sync",sep); |
2317 | sep = ","; | |
2318 | } | |
f655675b N |
2319 | if (test_bit(WriteMostly, &rdev->flags)) { |
2320 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2321 | sep = ","; | |
2322 | } | |
6bfe0b49 DW |
2323 | if (test_bit(Blocked, &rdev->flags)) { |
2324 | len += sprintf(page+len, "%sblocked", sep); | |
2325 | sep = ","; | |
2326 | } | |
b2d444d7 N |
2327 | if (!test_bit(Faulty, &rdev->flags) && |
2328 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2329 | len += sprintf(page+len, "%sspare", sep); |
2330 | sep = ","; | |
2331 | } | |
2332 | return len+sprintf(page+len, "\n"); | |
2333 | } | |
2334 | ||
45dc2de1 N |
2335 | static ssize_t |
2336 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2337 | { | |
2338 | /* can write | |
2339 | * faulty - simulates and error | |
2340 | * remove - disconnects the device | |
f655675b N |
2341 | * writemostly - sets write_mostly |
2342 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2343 | * blocked - sets the Blocked flag |
2344 | * -blocked - clears the Blocked flag | |
6d56e278 | 2345 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2346 | */ |
2347 | int err = -EINVAL; | |
2348 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2349 | md_error(rdev->mddev, rdev); | |
2350 | err = 0; | |
2351 | } else if (cmd_match(buf, "remove")) { | |
2352 | if (rdev->raid_disk >= 0) | |
2353 | err = -EBUSY; | |
2354 | else { | |
2355 | mddev_t *mddev = rdev->mddev; | |
2356 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2357 | if (mddev->pers) |
2358 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2359 | md_new_event(mddev); |
2360 | err = 0; | |
2361 | } | |
f655675b N |
2362 | } else if (cmd_match(buf, "writemostly")) { |
2363 | set_bit(WriteMostly, &rdev->flags); | |
2364 | err = 0; | |
2365 | } else if (cmd_match(buf, "-writemostly")) { | |
2366 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2367 | err = 0; |
2368 | } else if (cmd_match(buf, "blocked")) { | |
2369 | set_bit(Blocked, &rdev->flags); | |
2370 | err = 0; | |
2371 | } else if (cmd_match(buf, "-blocked")) { | |
2372 | clear_bit(Blocked, &rdev->flags); | |
2373 | wake_up(&rdev->blocked_wait); | |
2374 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2375 | md_wakeup_thread(rdev->mddev->thread); | |
2376 | ||
6d56e278 N |
2377 | err = 0; |
2378 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2379 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2380 | err = 0; |
45dc2de1 | 2381 | } |
00bcb4ac N |
2382 | if (!err) |
2383 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2384 | return err ? err : len; |
2385 | } | |
80ca3a44 N |
2386 | static struct rdev_sysfs_entry rdev_state = |
2387 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2388 | |
4dbcdc75 N |
2389 | static ssize_t |
2390 | errors_show(mdk_rdev_t *rdev, char *page) | |
2391 | { | |
2392 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2393 | } | |
2394 | ||
2395 | static ssize_t | |
2396 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2397 | { | |
2398 | char *e; | |
2399 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2400 | if (*buf && (*e == 0 || *e == '\n')) { | |
2401 | atomic_set(&rdev->corrected_errors, n); | |
2402 | return len; | |
2403 | } | |
2404 | return -EINVAL; | |
2405 | } | |
2406 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2407 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2408 | |
014236d2 N |
2409 | static ssize_t |
2410 | slot_show(mdk_rdev_t *rdev, char *page) | |
2411 | { | |
2412 | if (rdev->raid_disk < 0) | |
2413 | return sprintf(page, "none\n"); | |
2414 | else | |
2415 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2416 | } | |
2417 | ||
2418 | static ssize_t | |
2419 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2420 | { | |
2421 | char *e; | |
c303da6d N |
2422 | int err; |
2423 | char nm[20]; | |
014236d2 N |
2424 | int slot = simple_strtoul(buf, &e, 10); |
2425 | if (strncmp(buf, "none", 4)==0) | |
2426 | slot = -1; | |
2427 | else if (e==buf || (*e && *e!= '\n')) | |
2428 | return -EINVAL; | |
6c2fce2e | 2429 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2430 | /* Setting 'slot' on an active array requires also |
2431 | * updating the 'rd%d' link, and communicating | |
2432 | * with the personality with ->hot_*_disk. | |
2433 | * For now we only support removing | |
2434 | * failed/spare devices. This normally happens automatically, | |
2435 | * but not when the metadata is externally managed. | |
2436 | */ | |
c303da6d N |
2437 | if (rdev->raid_disk == -1) |
2438 | return -EEXIST; | |
2439 | /* personality does all needed checks */ | |
2440 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2441 | return -EINVAL; | |
2442 | err = rdev->mddev->pers-> | |
2443 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2444 | if (err) | |
2445 | return err; | |
2446 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2447 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
b7103107 | 2448 | rdev->raid_disk = -1; |
c303da6d N |
2449 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2450 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2451 | } else if (rdev->mddev->pers) { |
2452 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2453 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2454 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2455 | */ |
2456 | ||
2457 | if (rdev->raid_disk != -1) | |
2458 | return -EBUSY; | |
2459 | ||
2460 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2461 | return -EINVAL; | |
2462 | ||
159ec1fc | 2463 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2464 | if (rdev2->raid_disk == slot) |
2465 | return -EEXIST; | |
2466 | ||
2467 | rdev->raid_disk = slot; | |
2468 | if (test_bit(In_sync, &rdev->flags)) | |
2469 | rdev->saved_raid_disk = slot; | |
2470 | else | |
2471 | rdev->saved_raid_disk = -1; | |
2472 | err = rdev->mddev->pers-> | |
2473 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2474 | if (err) { |
6c2fce2e | 2475 | rdev->raid_disk = -1; |
6c2fce2e | 2476 | return err; |
52664732 | 2477 | } else |
00bcb4ac | 2478 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6c2fce2e NB |
2479 | sprintf(nm, "rd%d", rdev->raid_disk); |
2480 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
00bcb4ac | 2481 | /* failure here is OK */; |
6c2fce2e | 2482 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d N |
2483 | } else { |
2484 | if (slot >= rdev->mddev->raid_disks) | |
2485 | return -ENOSPC; | |
2486 | rdev->raid_disk = slot; | |
2487 | /* assume it is working */ | |
c5d79adb N |
2488 | clear_bit(Faulty, &rdev->flags); |
2489 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2490 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2491 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2492 | } |
014236d2 N |
2493 | return len; |
2494 | } | |
2495 | ||
2496 | ||
2497 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2498 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2499 | |
93c8cad0 N |
2500 | static ssize_t |
2501 | offset_show(mdk_rdev_t *rdev, char *page) | |
2502 | { | |
6961ece4 | 2503 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2504 | } |
2505 | ||
2506 | static ssize_t | |
2507 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2508 | { | |
2509 | char *e; | |
2510 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2511 | if (e==buf || (*e && *e != '\n')) | |
2512 | return -EINVAL; | |
8ed0a521 | 2513 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2514 | return -EBUSY; |
dd8ac336 | 2515 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2516 | /* Must set offset before size, so overlap checks |
2517 | * can be sane */ | |
2518 | return -EBUSY; | |
93c8cad0 N |
2519 | rdev->data_offset = offset; |
2520 | return len; | |
2521 | } | |
2522 | ||
2523 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2524 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2525 | |
83303b61 N |
2526 | static ssize_t |
2527 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2528 | { | |
dd8ac336 | 2529 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2530 | } |
2531 | ||
c5d79adb N |
2532 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2533 | { | |
2534 | /* check if two start/length pairs overlap */ | |
2535 | if (s1+l1 <= s2) | |
2536 | return 0; | |
2537 | if (s2+l2 <= s1) | |
2538 | return 0; | |
2539 | return 1; | |
2540 | } | |
2541 | ||
b522adcd DW |
2542 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2543 | { | |
2544 | unsigned long long blocks; | |
2545 | sector_t new; | |
2546 | ||
2547 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2548 | return -EINVAL; | |
2549 | ||
2550 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2551 | return -EINVAL; /* sector conversion overflow */ | |
2552 | ||
2553 | new = blocks * 2; | |
2554 | if (new != blocks * 2) | |
2555 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2556 | ||
2557 | *sectors = new; | |
2558 | return 0; | |
2559 | } | |
2560 | ||
83303b61 N |
2561 | static ssize_t |
2562 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2563 | { | |
27c529bb | 2564 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2565 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2566 | sector_t sectors; |
27c529bb | 2567 | |
b522adcd | 2568 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2569 | return -EINVAL; |
0cd17fec | 2570 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2571 | if (my_mddev->persistent) { |
dd8ac336 AN |
2572 | sectors = super_types[my_mddev->major_version]. |
2573 | rdev_size_change(rdev, sectors); | |
2574 | if (!sectors) | |
0cd17fec | 2575 | return -EBUSY; |
dd8ac336 AN |
2576 | } else if (!sectors) |
2577 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2578 | rdev->data_offset; | |
0cd17fec | 2579 | } |
dd8ac336 | 2580 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2581 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2582 | |
dd8ac336 AN |
2583 | rdev->sectors = sectors; |
2584 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2585 | /* need to check that all other rdevs with the same ->bdev |
2586 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2587 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2588 | * we have to change it back, we will have the lock again. |
2589 | */ | |
2590 | mddev_t *mddev; | |
2591 | int overlap = 0; | |
159ec1fc | 2592 | struct list_head *tmp; |
c5d79adb | 2593 | |
27c529bb | 2594 | mddev_unlock(my_mddev); |
29ac4aa3 | 2595 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2596 | mdk_rdev_t *rdev2; |
2597 | ||
2598 | mddev_lock(mddev); | |
159ec1fc | 2599 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2600 | if (test_bit(AllReserved, &rdev2->flags) || |
2601 | (rdev->bdev == rdev2->bdev && | |
2602 | rdev != rdev2 && | |
dd8ac336 | 2603 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2604 | rdev2->data_offset, |
dd8ac336 | 2605 | rdev2->sectors))) { |
c5d79adb N |
2606 | overlap = 1; |
2607 | break; | |
2608 | } | |
2609 | mddev_unlock(mddev); | |
2610 | if (overlap) { | |
2611 | mddev_put(mddev); | |
2612 | break; | |
2613 | } | |
2614 | } | |
27c529bb | 2615 | mddev_lock(my_mddev); |
c5d79adb N |
2616 | if (overlap) { |
2617 | /* Someone else could have slipped in a size | |
2618 | * change here, but doing so is just silly. | |
dd8ac336 | 2619 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2620 | * safe, and trust userspace not to race with |
2621 | * itself | |
2622 | */ | |
dd8ac336 | 2623 | rdev->sectors = oldsectors; |
c5d79adb N |
2624 | return -EBUSY; |
2625 | } | |
2626 | } | |
83303b61 N |
2627 | return len; |
2628 | } | |
2629 | ||
2630 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2631 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2632 | |
06e3c817 DW |
2633 | |
2634 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2635 | { | |
2636 | unsigned long long recovery_start = rdev->recovery_offset; | |
2637 | ||
2638 | if (test_bit(In_sync, &rdev->flags) || | |
2639 | recovery_start == MaxSector) | |
2640 | return sprintf(page, "none\n"); | |
2641 | ||
2642 | return sprintf(page, "%llu\n", recovery_start); | |
2643 | } | |
2644 | ||
2645 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2646 | { | |
2647 | unsigned long long recovery_start; | |
2648 | ||
2649 | if (cmd_match(buf, "none")) | |
2650 | recovery_start = MaxSector; | |
2651 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2652 | return -EINVAL; | |
2653 | ||
2654 | if (rdev->mddev->pers && | |
2655 | rdev->raid_disk >= 0) | |
2656 | return -EBUSY; | |
2657 | ||
2658 | rdev->recovery_offset = recovery_start; | |
2659 | if (recovery_start == MaxSector) | |
2660 | set_bit(In_sync, &rdev->flags); | |
2661 | else | |
2662 | clear_bit(In_sync, &rdev->flags); | |
2663 | return len; | |
2664 | } | |
2665 | ||
2666 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2667 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2668 | ||
86e6ffdd N |
2669 | static struct attribute *rdev_default_attrs[] = { |
2670 | &rdev_state.attr, | |
4dbcdc75 | 2671 | &rdev_errors.attr, |
014236d2 | 2672 | &rdev_slot.attr, |
93c8cad0 | 2673 | &rdev_offset.attr, |
83303b61 | 2674 | &rdev_size.attr, |
06e3c817 | 2675 | &rdev_recovery_start.attr, |
86e6ffdd N |
2676 | NULL, |
2677 | }; | |
2678 | static ssize_t | |
2679 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2680 | { | |
2681 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2682 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2683 | mddev_t *mddev = rdev->mddev; |
2684 | ssize_t rv; | |
86e6ffdd N |
2685 | |
2686 | if (!entry->show) | |
2687 | return -EIO; | |
27c529bb N |
2688 | |
2689 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2690 | if (!rv) { | |
2691 | if (rdev->mddev == NULL) | |
2692 | rv = -EBUSY; | |
2693 | else | |
2694 | rv = entry->show(rdev, page); | |
2695 | mddev_unlock(mddev); | |
2696 | } | |
2697 | return rv; | |
86e6ffdd N |
2698 | } |
2699 | ||
2700 | static ssize_t | |
2701 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2702 | const char *page, size_t length) | |
2703 | { | |
2704 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2705 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2706 | ssize_t rv; |
2707 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2708 | |
2709 | if (!entry->store) | |
2710 | return -EIO; | |
67463acb N |
2711 | if (!capable(CAP_SYS_ADMIN)) |
2712 | return -EACCES; | |
27c529bb | 2713 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2714 | if (!rv) { |
27c529bb N |
2715 | if (rdev->mddev == NULL) |
2716 | rv = -EBUSY; | |
2717 | else | |
2718 | rv = entry->store(rdev, page, length); | |
6a51830e | 2719 | mddev_unlock(mddev); |
ca388059 N |
2720 | } |
2721 | return rv; | |
86e6ffdd N |
2722 | } |
2723 | ||
2724 | static void rdev_free(struct kobject *ko) | |
2725 | { | |
2726 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2727 | kfree(rdev); | |
2728 | } | |
52cf25d0 | 2729 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2730 | .show = rdev_attr_show, |
2731 | .store = rdev_attr_store, | |
2732 | }; | |
2733 | static struct kobj_type rdev_ktype = { | |
2734 | .release = rdev_free, | |
2735 | .sysfs_ops = &rdev_sysfs_ops, | |
2736 | .default_attrs = rdev_default_attrs, | |
2737 | }; | |
2738 | ||
e8bb9a83 N |
2739 | void md_rdev_init(mdk_rdev_t *rdev) |
2740 | { | |
2741 | rdev->desc_nr = -1; | |
2742 | rdev->saved_raid_disk = -1; | |
2743 | rdev->raid_disk = -1; | |
2744 | rdev->flags = 0; | |
2745 | rdev->data_offset = 0; | |
2746 | rdev->sb_events = 0; | |
2747 | rdev->last_read_error.tv_sec = 0; | |
2748 | rdev->last_read_error.tv_nsec = 0; | |
2749 | atomic_set(&rdev->nr_pending, 0); | |
2750 | atomic_set(&rdev->read_errors, 0); | |
2751 | atomic_set(&rdev->corrected_errors, 0); | |
2752 | ||
2753 | INIT_LIST_HEAD(&rdev->same_set); | |
2754 | init_waitqueue_head(&rdev->blocked_wait); | |
2755 | } | |
2756 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
2757 | /* |
2758 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2759 | * | |
2760 | * mark the device faulty if: | |
2761 | * | |
2762 | * - the device is nonexistent (zero size) | |
2763 | * - the device has no valid superblock | |
2764 | * | |
2765 | * a faulty rdev _never_ has rdev->sb set. | |
2766 | */ | |
2767 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2768 | { | |
2769 | char b[BDEVNAME_SIZE]; | |
2770 | int err; | |
2771 | mdk_rdev_t *rdev; | |
2772 | sector_t size; | |
2773 | ||
9ffae0cf | 2774 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2775 | if (!rdev) { |
2776 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2777 | return ERR_PTR(-ENOMEM); | |
2778 | } | |
1da177e4 | 2779 | |
e8bb9a83 | 2780 | md_rdev_init(rdev); |
1da177e4 LT |
2781 | if ((err = alloc_disk_sb(rdev))) |
2782 | goto abort_free; | |
2783 | ||
c5d79adb | 2784 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2785 | if (err) |
2786 | goto abort_free; | |
2787 | ||
f9cb074b | 2788 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2789 | |
1da177e4 LT |
2790 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; |
2791 | if (!size) { | |
2792 | printk(KERN_WARNING | |
2793 | "md: %s has zero or unknown size, marking faulty!\n", | |
2794 | bdevname(rdev->bdev,b)); | |
2795 | err = -EINVAL; | |
2796 | goto abort_free; | |
2797 | } | |
2798 | ||
2799 | if (super_format >= 0) { | |
2800 | err = super_types[super_format]. | |
2801 | load_super(rdev, NULL, super_minor); | |
2802 | if (err == -EINVAL) { | |
df968c4e N |
2803 | printk(KERN_WARNING |
2804 | "md: %s does not have a valid v%d.%d " | |
2805 | "superblock, not importing!\n", | |
2806 | bdevname(rdev->bdev,b), | |
2807 | super_format, super_minor); | |
1da177e4 LT |
2808 | goto abort_free; |
2809 | } | |
2810 | if (err < 0) { | |
2811 | printk(KERN_WARNING | |
2812 | "md: could not read %s's sb, not importing!\n", | |
2813 | bdevname(rdev->bdev,b)); | |
2814 | goto abort_free; | |
2815 | } | |
2816 | } | |
6bfe0b49 | 2817 | |
1da177e4 LT |
2818 | return rdev; |
2819 | ||
2820 | abort_free: | |
2821 | if (rdev->sb_page) { | |
2822 | if (rdev->bdev) | |
2823 | unlock_rdev(rdev); | |
2824 | free_disk_sb(rdev); | |
2825 | } | |
2826 | kfree(rdev); | |
2827 | return ERR_PTR(err); | |
2828 | } | |
2829 | ||
2830 | /* | |
2831 | * Check a full RAID array for plausibility | |
2832 | */ | |
2833 | ||
2834 | ||
a757e64c | 2835 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2836 | { |
2837 | int i; | |
159ec1fc | 2838 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2839 | char b[BDEVNAME_SIZE]; |
2840 | ||
2841 | freshest = NULL; | |
d089c6af | 2842 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2843 | switch (super_types[mddev->major_version]. |
2844 | load_super(rdev, freshest, mddev->minor_version)) { | |
2845 | case 1: | |
2846 | freshest = rdev; | |
2847 | break; | |
2848 | case 0: | |
2849 | break; | |
2850 | default: | |
2851 | printk( KERN_ERR \ | |
2852 | "md: fatal superblock inconsistency in %s" | |
2853 | " -- removing from array\n", | |
2854 | bdevname(rdev->bdev,b)); | |
2855 | kick_rdev_from_array(rdev); | |
2856 | } | |
2857 | ||
2858 | ||
2859 | super_types[mddev->major_version]. | |
2860 | validate_super(mddev, freshest); | |
2861 | ||
2862 | i = 0; | |
d089c6af | 2863 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
2864 | if (mddev->max_disks && |
2865 | (rdev->desc_nr >= mddev->max_disks || | |
2866 | i > mddev->max_disks)) { | |
de01dfad N |
2867 | printk(KERN_WARNING |
2868 | "md: %s: %s: only %d devices permitted\n", | |
2869 | mdname(mddev), bdevname(rdev->bdev, b), | |
2870 | mddev->max_disks); | |
2871 | kick_rdev_from_array(rdev); | |
2872 | continue; | |
2873 | } | |
1da177e4 LT |
2874 | if (rdev != freshest) |
2875 | if (super_types[mddev->major_version]. | |
2876 | validate_super(mddev, rdev)) { | |
2877 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2878 | " from array!\n", | |
2879 | bdevname(rdev->bdev,b)); | |
2880 | kick_rdev_from_array(rdev); | |
2881 | continue; | |
2882 | } | |
2883 | if (mddev->level == LEVEL_MULTIPATH) { | |
2884 | rdev->desc_nr = i++; | |
2885 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2886 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2887 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2888 | rdev->raid_disk = -1; |
2889 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2890 | } |
2891 | } | |
1da177e4 LT |
2892 | } |
2893 | ||
72e02075 N |
2894 | /* Read a fixed-point number. |
2895 | * Numbers in sysfs attributes should be in "standard" units where | |
2896 | * possible, so time should be in seconds. | |
2897 | * However we internally use a a much smaller unit such as | |
2898 | * milliseconds or jiffies. | |
2899 | * This function takes a decimal number with a possible fractional | |
2900 | * component, and produces an integer which is the result of | |
2901 | * multiplying that number by 10^'scale'. | |
2902 | * all without any floating-point arithmetic. | |
2903 | */ | |
2904 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2905 | { | |
2906 | unsigned long result = 0; | |
2907 | long decimals = -1; | |
2908 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
2909 | if (*cp == '.') | |
2910 | decimals = 0; | |
2911 | else if (decimals < scale) { | |
2912 | unsigned int value; | |
2913 | value = *cp - '0'; | |
2914 | result = result * 10 + value; | |
2915 | if (decimals >= 0) | |
2916 | decimals++; | |
2917 | } | |
2918 | cp++; | |
2919 | } | |
2920 | if (*cp == '\n') | |
2921 | cp++; | |
2922 | if (*cp) | |
2923 | return -EINVAL; | |
2924 | if (decimals < 0) | |
2925 | decimals = 0; | |
2926 | while (decimals < scale) { | |
2927 | result *= 10; | |
2928 | decimals ++; | |
2929 | } | |
2930 | *res = result; | |
2931 | return 0; | |
2932 | } | |
2933 | ||
2934 | ||
19052c0e N |
2935 | static void md_safemode_timeout(unsigned long data); |
2936 | ||
16f17b39 N |
2937 | static ssize_t |
2938 | safe_delay_show(mddev_t *mddev, char *page) | |
2939 | { | |
2940 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2941 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2942 | } | |
2943 | static ssize_t | |
2944 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2945 | { | |
16f17b39 | 2946 | unsigned long msec; |
97ce0a7f | 2947 | |
72e02075 | 2948 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 2949 | return -EINVAL; |
16f17b39 N |
2950 | if (msec == 0) |
2951 | mddev->safemode_delay = 0; | |
2952 | else { | |
19052c0e | 2953 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2954 | mddev->safemode_delay = (msec*HZ)/1000; |
2955 | if (mddev->safemode_delay == 0) | |
2956 | mddev->safemode_delay = 1; | |
19052c0e N |
2957 | if (mddev->safemode_delay < old_delay) |
2958 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2959 | } |
2960 | return len; | |
2961 | } | |
2962 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2963 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2964 | |
eae1701f | 2965 | static ssize_t |
96de1e66 | 2966 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2967 | { |
2604b703 | 2968 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2969 | if (p) |
eae1701f | 2970 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2971 | else if (mddev->clevel[0]) |
2972 | return sprintf(page, "%s\n", mddev->clevel); | |
2973 | else if (mddev->level != LEVEL_NONE) | |
2974 | return sprintf(page, "%d\n", mddev->level); | |
2975 | else | |
2976 | return 0; | |
eae1701f N |
2977 | } |
2978 | ||
d9d166c2 N |
2979 | static ssize_t |
2980 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2981 | { | |
f2859af6 | 2982 | char clevel[16]; |
20a49ff6 | 2983 | ssize_t rv = len; |
245f46c2 | 2984 | struct mdk_personality *pers; |
f2859af6 | 2985 | long level; |
245f46c2 | 2986 | void *priv; |
3a981b03 | 2987 | mdk_rdev_t *rdev; |
245f46c2 N |
2988 | |
2989 | if (mddev->pers == NULL) { | |
2990 | if (len == 0) | |
2991 | return 0; | |
2992 | if (len >= sizeof(mddev->clevel)) | |
2993 | return -ENOSPC; | |
2994 | strncpy(mddev->clevel, buf, len); | |
2995 | if (mddev->clevel[len-1] == '\n') | |
2996 | len--; | |
2997 | mddev->clevel[len] = 0; | |
2998 | mddev->level = LEVEL_NONE; | |
2999 | return rv; | |
3000 | } | |
3001 | ||
3002 | /* request to change the personality. Need to ensure: | |
3003 | * - array is not engaged in resync/recovery/reshape | |
3004 | * - old personality can be suspended | |
3005 | * - new personality will access other array. | |
3006 | */ | |
3007 | ||
bb4f1e9d N |
3008 | if (mddev->sync_thread || |
3009 | mddev->reshape_position != MaxSector || | |
3010 | mddev->sysfs_active) | |
d9d166c2 | 3011 | return -EBUSY; |
245f46c2 N |
3012 | |
3013 | if (!mddev->pers->quiesce) { | |
3014 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3015 | mdname(mddev), mddev->pers->name); | |
3016 | return -EINVAL; | |
3017 | } | |
3018 | ||
3019 | /* Now find the new personality */ | |
f2859af6 | 3020 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3021 | return -EINVAL; |
f2859af6 DW |
3022 | strncpy(clevel, buf, len); |
3023 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3024 | len--; |
f2859af6 DW |
3025 | clevel[len] = 0; |
3026 | if (strict_strtol(clevel, 10, &level)) | |
3027 | level = LEVEL_NONE; | |
245f46c2 | 3028 | |
f2859af6 DW |
3029 | if (request_module("md-%s", clevel) != 0) |
3030 | request_module("md-level-%s", clevel); | |
245f46c2 | 3031 | spin_lock(&pers_lock); |
f2859af6 | 3032 | pers = find_pers(level, clevel); |
245f46c2 N |
3033 | if (!pers || !try_module_get(pers->owner)) { |
3034 | spin_unlock(&pers_lock); | |
f2859af6 | 3035 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3036 | return -EINVAL; |
3037 | } | |
3038 | spin_unlock(&pers_lock); | |
3039 | ||
3040 | if (pers == mddev->pers) { | |
3041 | /* Nothing to do! */ | |
3042 | module_put(pers->owner); | |
3043 | return rv; | |
3044 | } | |
3045 | if (!pers->takeover) { | |
3046 | module_put(pers->owner); | |
3047 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3048 | mdname(mddev), clevel); |
245f46c2 N |
3049 | return -EINVAL; |
3050 | } | |
3051 | ||
e93f68a1 N |
3052 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3053 | rdev->new_raid_disk = rdev->raid_disk; | |
3054 | ||
245f46c2 N |
3055 | /* ->takeover must set new_* and/or delta_disks |
3056 | * if it succeeds, and may set them when it fails. | |
3057 | */ | |
3058 | priv = pers->takeover(mddev); | |
3059 | if (IS_ERR(priv)) { | |
3060 | mddev->new_level = mddev->level; | |
3061 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3062 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3063 | mddev->raid_disks -= mddev->delta_disks; |
3064 | mddev->delta_disks = 0; | |
3065 | module_put(pers->owner); | |
3066 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3067 | mdname(mddev), clevel); |
245f46c2 N |
3068 | return PTR_ERR(priv); |
3069 | } | |
3070 | ||
3071 | /* Looks like we have a winner */ | |
3072 | mddev_suspend(mddev); | |
3073 | mddev->pers->stop(mddev); | |
a64c876f N |
3074 | |
3075 | if (mddev->pers->sync_request == NULL && | |
3076 | pers->sync_request != NULL) { | |
3077 | /* need to add the md_redundancy_group */ | |
3078 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3079 | printk(KERN_WARNING | |
3080 | "md: cannot register extra attributes for %s\n", | |
3081 | mdname(mddev)); | |
19fdb9ee | 3082 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3083 | } |
3084 | if (mddev->pers->sync_request != NULL && | |
3085 | pers->sync_request == NULL) { | |
3086 | /* need to remove the md_redundancy_group */ | |
3087 | if (mddev->to_remove == NULL) | |
3088 | mddev->to_remove = &md_redundancy_group; | |
3089 | } | |
3090 | ||
54071b38 TM |
3091 | if (mddev->pers->sync_request == NULL && |
3092 | mddev->external) { | |
3093 | /* We are converting from a no-redundancy array | |
3094 | * to a redundancy array and metadata is managed | |
3095 | * externally so we need to be sure that writes | |
3096 | * won't block due to a need to transition | |
3097 | * clean->dirty | |
3098 | * until external management is started. | |
3099 | */ | |
3100 | mddev->in_sync = 0; | |
3101 | mddev->safemode_delay = 0; | |
3102 | mddev->safemode = 0; | |
3103 | } | |
3104 | ||
e93f68a1 N |
3105 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
3106 | char nm[20]; | |
3107 | if (rdev->raid_disk < 0) | |
3108 | continue; | |
3109 | if (rdev->new_raid_disk > mddev->raid_disks) | |
3110 | rdev->new_raid_disk = -1; | |
3111 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3112 | continue; | |
3113 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3114 | sysfs_remove_link(&mddev->kobj, nm); | |
3115 | } | |
3116 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3117 | if (rdev->raid_disk < 0) | |
3118 | continue; | |
3119 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3120 | continue; | |
3121 | rdev->raid_disk = rdev->new_raid_disk; | |
3122 | if (rdev->raid_disk < 0) | |
3a981b03 | 3123 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 N |
3124 | else { |
3125 | char nm[20]; | |
3126 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3127 | if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) | |
3128 | printk("md: cannot register %s for %s after level change\n", | |
3129 | nm, mdname(mddev)); | |
3a981b03 | 3130 | } |
e93f68a1 N |
3131 | } |
3132 | ||
3133 | module_put(mddev->pers->owner); | |
245f46c2 N |
3134 | mddev->pers = pers; |
3135 | mddev->private = priv; | |
3136 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3137 | mddev->level = mddev->new_level; | |
3138 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3139 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3140 | mddev->delta_disks = 0; |
9af204cf TM |
3141 | if (mddev->pers->sync_request == NULL) { |
3142 | /* this is now an array without redundancy, so | |
3143 | * it must always be in_sync | |
3144 | */ | |
3145 | mddev->in_sync = 1; | |
3146 | del_timer_sync(&mddev->safemode_timer); | |
3147 | } | |
245f46c2 N |
3148 | pers->run(mddev); |
3149 | mddev_resume(mddev); | |
3150 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3151 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3152 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3153 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3154 | md_new_event(mddev); |
d9d166c2 N |
3155 | return rv; |
3156 | } | |
3157 | ||
3158 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3159 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3160 | |
d4dbd025 N |
3161 | |
3162 | static ssize_t | |
3163 | layout_show(mddev_t *mddev, char *page) | |
3164 | { | |
3165 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3166 | if (mddev->reshape_position != MaxSector && |
3167 | mddev->layout != mddev->new_layout) | |
3168 | return sprintf(page, "%d (%d)\n", | |
3169 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3170 | return sprintf(page, "%d\n", mddev->layout); |
3171 | } | |
3172 | ||
3173 | static ssize_t | |
3174 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3175 | { | |
3176 | char *e; | |
3177 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3178 | |
3179 | if (!*buf || (*e && *e != '\n')) | |
3180 | return -EINVAL; | |
3181 | ||
b3546035 N |
3182 | if (mddev->pers) { |
3183 | int err; | |
50ac168a | 3184 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3185 | return -EBUSY; |
597a711b | 3186 | mddev->new_layout = n; |
50ac168a | 3187 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3188 | if (err) { |
3189 | mddev->new_layout = mddev->layout; | |
b3546035 | 3190 | return err; |
597a711b | 3191 | } |
b3546035 | 3192 | } else { |
08a02ecd | 3193 | mddev->new_layout = n; |
b3546035 N |
3194 | if (mddev->reshape_position == MaxSector) |
3195 | mddev->layout = n; | |
3196 | } | |
d4dbd025 N |
3197 | return len; |
3198 | } | |
3199 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3200 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3201 | |
3202 | ||
eae1701f | 3203 | static ssize_t |
96de1e66 | 3204 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3205 | { |
bb636547 N |
3206 | if (mddev->raid_disks == 0) |
3207 | return 0; | |
08a02ecd N |
3208 | if (mddev->reshape_position != MaxSector && |
3209 | mddev->delta_disks != 0) | |
3210 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3211 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3212 | return sprintf(page, "%d\n", mddev->raid_disks); |
3213 | } | |
3214 | ||
da943b99 N |
3215 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3216 | ||
3217 | static ssize_t | |
3218 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3219 | { | |
da943b99 N |
3220 | char *e; |
3221 | int rv = 0; | |
3222 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3223 | ||
3224 | if (!*buf || (*e && *e != '\n')) | |
3225 | return -EINVAL; | |
3226 | ||
3227 | if (mddev->pers) | |
3228 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3229 | else if (mddev->reshape_position != MaxSector) { |
3230 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3231 | mddev->delta_disks = n - olddisks; | |
3232 | mddev->raid_disks = n; | |
3233 | } else | |
da943b99 N |
3234 | mddev->raid_disks = n; |
3235 | return rv ? rv : len; | |
3236 | } | |
3237 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3238 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3239 | |
3b34380a N |
3240 | static ssize_t |
3241 | chunk_size_show(mddev_t *mddev, char *page) | |
3242 | { | |
08a02ecd | 3243 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3244 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3245 | return sprintf(page, "%d (%d)\n", | |
3246 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3247 | mddev->chunk_sectors << 9); |
3248 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3249 | } |
3250 | ||
3251 | static ssize_t | |
3252 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3253 | { | |
3b34380a N |
3254 | char *e; |
3255 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3256 | ||
3b34380a N |
3257 | if (!*buf || (*e && *e != '\n')) |
3258 | return -EINVAL; | |
3259 | ||
b3546035 N |
3260 | if (mddev->pers) { |
3261 | int err; | |
50ac168a | 3262 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3263 | return -EBUSY; |
597a711b | 3264 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3265 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3266 | if (err) { |
3267 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3268 | return err; |
597a711b | 3269 | } |
b3546035 | 3270 | } else { |
664e7c41 | 3271 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3272 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3273 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3274 | } |
3b34380a N |
3275 | return len; |
3276 | } | |
3277 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3278 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3279 | |
a94213b1 N |
3280 | static ssize_t |
3281 | resync_start_show(mddev_t *mddev, char *page) | |
3282 | { | |
d1a7c503 N |
3283 | if (mddev->recovery_cp == MaxSector) |
3284 | return sprintf(page, "none\n"); | |
a94213b1 N |
3285 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3286 | } | |
3287 | ||
3288 | static ssize_t | |
3289 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3290 | { | |
a94213b1 N |
3291 | char *e; |
3292 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3293 | ||
3294 | if (mddev->pers) | |
3295 | return -EBUSY; | |
06e3c817 DW |
3296 | if (cmd_match(buf, "none")) |
3297 | n = MaxSector; | |
3298 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3299 | return -EINVAL; |
3300 | ||
3301 | mddev->recovery_cp = n; | |
3302 | return len; | |
3303 | } | |
3304 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3305 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3306 | |
9e653b63 N |
3307 | /* |
3308 | * The array state can be: | |
3309 | * | |
3310 | * clear | |
3311 | * No devices, no size, no level | |
3312 | * Equivalent to STOP_ARRAY ioctl | |
3313 | * inactive | |
3314 | * May have some settings, but array is not active | |
3315 | * all IO results in error | |
3316 | * When written, doesn't tear down array, but just stops it | |
3317 | * suspended (not supported yet) | |
3318 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3319 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3320 | * readonly |
3321 | * no resync can happen. no superblocks get written. | |
3322 | * write requests fail | |
3323 | * read-auto | |
3324 | * like readonly, but behaves like 'clean' on a write request. | |
3325 | * | |
3326 | * clean - no pending writes, but otherwise active. | |
3327 | * When written to inactive array, starts without resync | |
3328 | * If a write request arrives then | |
3329 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3330 | * if not known, block and switch to write-pending | |
3331 | * If written to an active array that has pending writes, then fails. | |
3332 | * active | |
3333 | * fully active: IO and resync can be happening. | |
3334 | * When written to inactive array, starts with resync | |
3335 | * | |
3336 | * write-pending | |
3337 | * clean, but writes are blocked waiting for 'active' to be written. | |
3338 | * | |
3339 | * active-idle | |
3340 | * like active, but no writes have been seen for a while (100msec). | |
3341 | * | |
3342 | */ | |
3343 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3344 | write_pending, active_idle, bad_word}; | |
05381954 | 3345 | static char *array_states[] = { |
9e653b63 N |
3346 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3347 | "write-pending", "active-idle", NULL }; | |
3348 | ||
3349 | static int match_word(const char *word, char **list) | |
3350 | { | |
3351 | int n; | |
3352 | for (n=0; list[n]; n++) | |
3353 | if (cmd_match(word, list[n])) | |
3354 | break; | |
3355 | return n; | |
3356 | } | |
3357 | ||
3358 | static ssize_t | |
3359 | array_state_show(mddev_t *mddev, char *page) | |
3360 | { | |
3361 | enum array_state st = inactive; | |
3362 | ||
3363 | if (mddev->pers) | |
3364 | switch(mddev->ro) { | |
3365 | case 1: | |
3366 | st = readonly; | |
3367 | break; | |
3368 | case 2: | |
3369 | st = read_auto; | |
3370 | break; | |
3371 | case 0: | |
3372 | if (mddev->in_sync) | |
3373 | st = clean; | |
e691063a N |
3374 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
3375 | st = write_pending; | |
9e653b63 N |
3376 | else if (mddev->safemode) |
3377 | st = active_idle; | |
3378 | else | |
3379 | st = active; | |
3380 | } | |
3381 | else { | |
3382 | if (list_empty(&mddev->disks) && | |
3383 | mddev->raid_disks == 0 && | |
58c0fed4 | 3384 | mddev->dev_sectors == 0) |
9e653b63 N |
3385 | st = clear; |
3386 | else | |
3387 | st = inactive; | |
3388 | } | |
3389 | return sprintf(page, "%s\n", array_states[st]); | |
3390 | } | |
3391 | ||
df5b20cf | 3392 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3393 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3394 | static int do_md_run(mddev_t * mddev); |
3395 | static int restart_array(mddev_t *mddev); | |
3396 | ||
3397 | static ssize_t | |
3398 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3399 | { | |
3400 | int err = -EINVAL; | |
3401 | enum array_state st = match_word(buf, array_states); | |
3402 | switch(st) { | |
3403 | case bad_word: | |
3404 | break; | |
3405 | case clear: | |
3406 | /* stopping an active array */ | |
f2ea68cf | 3407 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3408 | return -EBUSY; |
df5b20cf | 3409 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3410 | break; |
3411 | case inactive: | |
3412 | /* stopping an active array */ | |
3413 | if (mddev->pers) { | |
f2ea68cf | 3414 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3415 | return -EBUSY; |
df5b20cf | 3416 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3417 | } else |
3418 | err = 0; /* already inactive */ | |
9e653b63 N |
3419 | break; |
3420 | case suspended: | |
3421 | break; /* not supported yet */ | |
3422 | case readonly: | |
3423 | if (mddev->pers) | |
a4bd82d0 | 3424 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3425 | else { |
3426 | mddev->ro = 1; | |
648b629e | 3427 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3428 | err = do_md_run(mddev); |
3429 | } | |
3430 | break; | |
3431 | case read_auto: | |
9e653b63 | 3432 | if (mddev->pers) { |
80268ee9 | 3433 | if (mddev->ro == 0) |
a4bd82d0 | 3434 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3435 | else if (mddev->ro == 1) |
648b629e N |
3436 | err = restart_array(mddev); |
3437 | if (err == 0) { | |
3438 | mddev->ro = 2; | |
3439 | set_disk_ro(mddev->gendisk, 0); | |
3440 | } | |
9e653b63 N |
3441 | } else { |
3442 | mddev->ro = 2; | |
3443 | err = do_md_run(mddev); | |
3444 | } | |
3445 | break; | |
3446 | case clean: | |
3447 | if (mddev->pers) { | |
3448 | restart_array(mddev); | |
3449 | spin_lock_irq(&mddev->write_lock); | |
3450 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3451 | if (mddev->in_sync == 0) { |
3452 | mddev->in_sync = 1; | |
31a59e34 N |
3453 | if (mddev->safemode == 1) |
3454 | mddev->safemode = 0; | |
e691063a N |
3455 | if (mddev->persistent) |
3456 | set_bit(MD_CHANGE_CLEAN, | |
3457 | &mddev->flags); | |
3458 | } | |
3459 | err = 0; | |
3460 | } else | |
3461 | err = -EBUSY; | |
9e653b63 | 3462 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3463 | } else |
3464 | err = -EINVAL; | |
9e653b63 N |
3465 | break; |
3466 | case active: | |
3467 | if (mddev->pers) { | |
3468 | restart_array(mddev); | |
e691063a N |
3469 | if (mddev->external) |
3470 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
3471 | wake_up(&mddev->sb_wait); |
3472 | err = 0; | |
3473 | } else { | |
3474 | mddev->ro = 0; | |
648b629e | 3475 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3476 | err = do_md_run(mddev); |
3477 | } | |
3478 | break; | |
3479 | case write_pending: | |
3480 | case active_idle: | |
3481 | /* these cannot be set */ | |
3482 | break; | |
3483 | } | |
3484 | if (err) | |
3485 | return err; | |
0fd62b86 | 3486 | else { |
00bcb4ac | 3487 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3488 | return len; |
0fd62b86 | 3489 | } |
9e653b63 | 3490 | } |
80ca3a44 N |
3491 | static struct md_sysfs_entry md_array_state = |
3492 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3493 | |
1e50915f RB |
3494 | static ssize_t |
3495 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3496 | return sprintf(page, "%d\n", | |
3497 | atomic_read(&mddev->max_corr_read_errors)); | |
3498 | } | |
3499 | ||
3500 | static ssize_t | |
3501 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3502 | { | |
3503 | char *e; | |
3504 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3505 | ||
3506 | if (*buf && (*e == 0 || *e == '\n')) { | |
3507 | atomic_set(&mddev->max_corr_read_errors, n); | |
3508 | return len; | |
3509 | } | |
3510 | return -EINVAL; | |
3511 | } | |
3512 | ||
3513 | static struct md_sysfs_entry max_corr_read_errors = | |
3514 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3515 | max_corrected_read_errors_store); | |
3516 | ||
6d7ff738 N |
3517 | static ssize_t |
3518 | null_show(mddev_t *mddev, char *page) | |
3519 | { | |
3520 | return -EINVAL; | |
3521 | } | |
3522 | ||
3523 | static ssize_t | |
3524 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3525 | { | |
3526 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3527 | /* The new device is added to the array. | |
3528 | * If the array has a persistent superblock, we read the | |
3529 | * superblock to initialise info and check validity. | |
3530 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3531 | * which mainly checks size. | |
3532 | */ | |
3533 | char *e; | |
3534 | int major = simple_strtoul(buf, &e, 10); | |
3535 | int minor; | |
3536 | dev_t dev; | |
3537 | mdk_rdev_t *rdev; | |
3538 | int err; | |
3539 | ||
3540 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3541 | return -EINVAL; | |
3542 | minor = simple_strtoul(e+1, &e, 10); | |
3543 | if (*e && *e != '\n') | |
3544 | return -EINVAL; | |
3545 | dev = MKDEV(major, minor); | |
3546 | if (major != MAJOR(dev) || | |
3547 | minor != MINOR(dev)) | |
3548 | return -EOVERFLOW; | |
3549 | ||
3550 | ||
3551 | if (mddev->persistent) { | |
3552 | rdev = md_import_device(dev, mddev->major_version, | |
3553 | mddev->minor_version); | |
3554 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3555 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3556 | mdk_rdev_t, same_set); | |
3557 | err = super_types[mddev->major_version] | |
3558 | .load_super(rdev, rdev0, mddev->minor_version); | |
3559 | if (err < 0) | |
3560 | goto out; | |
3561 | } | |
c5d79adb N |
3562 | } else if (mddev->external) |
3563 | rdev = md_import_device(dev, -2, -1); | |
3564 | else | |
6d7ff738 N |
3565 | rdev = md_import_device(dev, -1, -1); |
3566 | ||
3567 | if (IS_ERR(rdev)) | |
3568 | return PTR_ERR(rdev); | |
3569 | err = bind_rdev_to_array(rdev, mddev); | |
3570 | out: | |
3571 | if (err) | |
3572 | export_rdev(rdev); | |
3573 | return err ? err : len; | |
3574 | } | |
3575 | ||
3576 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3577 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3578 | |
9b1d1dac PC |
3579 | static ssize_t |
3580 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3581 | { | |
3582 | char *end; | |
3583 | unsigned long chunk, end_chunk; | |
3584 | ||
3585 | if (!mddev->bitmap) | |
3586 | goto out; | |
3587 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3588 | while (*buf) { | |
3589 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3590 | if (buf == end) break; | |
3591 | if (*end == '-') { /* range */ | |
3592 | buf = end + 1; | |
3593 | end_chunk = simple_strtoul(buf, &end, 0); | |
3594 | if (buf == end) break; | |
3595 | } | |
3596 | if (*end && !isspace(*end)) break; | |
3597 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3598 | buf = skip_spaces(end); |
9b1d1dac PC |
3599 | } |
3600 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3601 | out: | |
3602 | return len; | |
3603 | } | |
3604 | ||
3605 | static struct md_sysfs_entry md_bitmap = | |
3606 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3607 | ||
a35b0d69 N |
3608 | static ssize_t |
3609 | size_show(mddev_t *mddev, char *page) | |
3610 | { | |
58c0fed4 AN |
3611 | return sprintf(page, "%llu\n", |
3612 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3613 | } |
3614 | ||
d71f9f88 | 3615 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3616 | |
3617 | static ssize_t | |
3618 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3619 | { | |
3620 | /* If array is inactive, we can reduce the component size, but | |
3621 | * not increase it (except from 0). | |
3622 | * If array is active, we can try an on-line resize | |
3623 | */ | |
b522adcd DW |
3624 | sector_t sectors; |
3625 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3626 | |
58c0fed4 AN |
3627 | if (err < 0) |
3628 | return err; | |
a35b0d69 | 3629 | if (mddev->pers) { |
58c0fed4 | 3630 | err = update_size(mddev, sectors); |
850b2b42 | 3631 | md_update_sb(mddev, 1); |
a35b0d69 | 3632 | } else { |
58c0fed4 AN |
3633 | if (mddev->dev_sectors == 0 || |
3634 | mddev->dev_sectors > sectors) | |
3635 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3636 | else |
3637 | err = -ENOSPC; | |
3638 | } | |
3639 | return err ? err : len; | |
3640 | } | |
3641 | ||
3642 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3643 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3644 | |
8bb93aac N |
3645 | |
3646 | /* Metdata version. | |
e691063a N |
3647 | * This is one of |
3648 | * 'none' for arrays with no metadata (good luck...) | |
3649 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3650 | * or N.M for internally known formats |
3651 | */ | |
3652 | static ssize_t | |
3653 | metadata_show(mddev_t *mddev, char *page) | |
3654 | { | |
3655 | if (mddev->persistent) | |
3656 | return sprintf(page, "%d.%d\n", | |
3657 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3658 | else if (mddev->external) |
3659 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3660 | else |
3661 | return sprintf(page, "none\n"); | |
3662 | } | |
3663 | ||
3664 | static ssize_t | |
3665 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3666 | { | |
3667 | int major, minor; | |
3668 | char *e; | |
ea43ddd8 N |
3669 | /* Changing the details of 'external' metadata is |
3670 | * always permitted. Otherwise there must be | |
3671 | * no devices attached to the array. | |
3672 | */ | |
3673 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3674 | ; | |
3675 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3676 | return -EBUSY; |
3677 | ||
3678 | if (cmd_match(buf, "none")) { | |
3679 | mddev->persistent = 0; | |
e691063a N |
3680 | mddev->external = 0; |
3681 | mddev->major_version = 0; | |
3682 | mddev->minor_version = 90; | |
3683 | return len; | |
3684 | } | |
3685 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3686 | size_t namelen = len-9; |
e691063a N |
3687 | if (namelen >= sizeof(mddev->metadata_type)) |
3688 | namelen = sizeof(mddev->metadata_type)-1; | |
3689 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3690 | mddev->metadata_type[namelen] = 0; | |
3691 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3692 | mddev->metadata_type[--namelen] = 0; | |
3693 | mddev->persistent = 0; | |
3694 | mddev->external = 1; | |
8bb93aac N |
3695 | mddev->major_version = 0; |
3696 | mddev->minor_version = 90; | |
3697 | return len; | |
3698 | } | |
3699 | major = simple_strtoul(buf, &e, 10); | |
3700 | if (e==buf || *e != '.') | |
3701 | return -EINVAL; | |
3702 | buf = e+1; | |
3703 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3704 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3705 | return -EINVAL; |
50511da3 | 3706 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3707 | return -ENOENT; |
3708 | mddev->major_version = major; | |
3709 | mddev->minor_version = minor; | |
3710 | mddev->persistent = 1; | |
e691063a | 3711 | mddev->external = 0; |
8bb93aac N |
3712 | return len; |
3713 | } | |
3714 | ||
3715 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3716 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3717 | |
24dd469d | 3718 | static ssize_t |
7eec314d | 3719 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3720 | { |
7eec314d | 3721 | char *type = "idle"; |
b6a9ce68 N |
3722 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3723 | type = "frozen"; | |
3724 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3725 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3726 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3727 | type = "reshape"; | |
3728 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3729 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3730 | type = "resync"; | |
3731 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3732 | type = "check"; | |
3733 | else | |
3734 | type = "repair"; | |
72a23c21 | 3735 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3736 | type = "recover"; |
3737 | } | |
3738 | return sprintf(page, "%s\n", type); | |
3739 | } | |
3740 | ||
3741 | static ssize_t | |
7eec314d | 3742 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3743 | { |
7eec314d N |
3744 | if (!mddev->pers || !mddev->pers->sync_request) |
3745 | return -EINVAL; | |
3746 | ||
b6a9ce68 N |
3747 | if (cmd_match(page, "frozen")) |
3748 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3749 | else | |
3750 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3751 | ||
3752 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3753 | if (mddev->sync_thread) { |
3754 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3755 | md_unregister_thread(mddev->sync_thread); | |
3756 | mddev->sync_thread = NULL; | |
3757 | mddev->recovery = 0; | |
3758 | } | |
03c902e1 N |
3759 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3760 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3761 | return -EBUSY; |
72a23c21 NB |
3762 | else if (cmd_match(page, "resync")) |
3763 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3764 | else if (cmd_match(page, "recover")) { | |
3765 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3766 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3767 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3768 | int err; |
3769 | if (mddev->pers->start_reshape == NULL) | |
3770 | return -EINVAL; | |
3771 | err = mddev->pers->start_reshape(mddev); | |
3772 | if (err) | |
3773 | return err; | |
a99ac971 | 3774 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3775 | } else { |
bce74dac | 3776 | if (cmd_match(page, "check")) |
7eec314d | 3777 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3778 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3779 | return -EINVAL; |
3780 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3781 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3782 | } |
03c902e1 | 3783 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3784 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 3785 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
3786 | return len; |
3787 | } | |
3788 | ||
9d88883e | 3789 | static ssize_t |
96de1e66 | 3790 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3791 | { |
3792 | return sprintf(page, "%llu\n", | |
3793 | (unsigned long long) mddev->resync_mismatches); | |
3794 | } | |
3795 | ||
80ca3a44 N |
3796 | static struct md_sysfs_entry md_scan_mode = |
3797 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3798 | |
96de1e66 | 3799 | |
80ca3a44 | 3800 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3801 | |
88202a0c N |
3802 | static ssize_t |
3803 | sync_min_show(mddev_t *mddev, char *page) | |
3804 | { | |
3805 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3806 | mddev->sync_speed_min ? "local": "system"); | |
3807 | } | |
3808 | ||
3809 | static ssize_t | |
3810 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3811 | { | |
3812 | int min; | |
3813 | char *e; | |
3814 | if (strncmp(buf, "system", 6)==0) { | |
3815 | mddev->sync_speed_min = 0; | |
3816 | return len; | |
3817 | } | |
3818 | min = simple_strtoul(buf, &e, 10); | |
3819 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3820 | return -EINVAL; | |
3821 | mddev->sync_speed_min = min; | |
3822 | return len; | |
3823 | } | |
3824 | ||
3825 | static struct md_sysfs_entry md_sync_min = | |
3826 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3827 | ||
3828 | static ssize_t | |
3829 | sync_max_show(mddev_t *mddev, char *page) | |
3830 | { | |
3831 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3832 | mddev->sync_speed_max ? "local": "system"); | |
3833 | } | |
3834 | ||
3835 | static ssize_t | |
3836 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3837 | { | |
3838 | int max; | |
3839 | char *e; | |
3840 | if (strncmp(buf, "system", 6)==0) { | |
3841 | mddev->sync_speed_max = 0; | |
3842 | return len; | |
3843 | } | |
3844 | max = simple_strtoul(buf, &e, 10); | |
3845 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3846 | return -EINVAL; | |
3847 | mddev->sync_speed_max = max; | |
3848 | return len; | |
3849 | } | |
3850 | ||
3851 | static struct md_sysfs_entry md_sync_max = | |
3852 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3853 | ||
d7f3d291 IP |
3854 | static ssize_t |
3855 | degraded_show(mddev_t *mddev, char *page) | |
3856 | { | |
3857 | return sprintf(page, "%d\n", mddev->degraded); | |
3858 | } | |
3859 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3860 | |
90b08710 BS |
3861 | static ssize_t |
3862 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3863 | { | |
3864 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3865 | } | |
3866 | ||
3867 | static ssize_t | |
3868 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3869 | { | |
3870 | long n; | |
3871 | ||
3872 | if (strict_strtol(buf, 10, &n)) | |
3873 | return -EINVAL; | |
3874 | ||
3875 | if (n != 0 && n != 1) | |
3876 | return -EINVAL; | |
3877 | ||
3878 | mddev->parallel_resync = n; | |
3879 | ||
3880 | if (mddev->sync_thread) | |
3881 | wake_up(&resync_wait); | |
3882 | ||
3883 | return len; | |
3884 | } | |
3885 | ||
3886 | /* force parallel resync, even with shared block devices */ | |
3887 | static struct md_sysfs_entry md_sync_force_parallel = | |
3888 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3889 | sync_force_parallel_show, sync_force_parallel_store); | |
3890 | ||
88202a0c N |
3891 | static ssize_t |
3892 | sync_speed_show(mddev_t *mddev, char *page) | |
3893 | { | |
3894 | unsigned long resync, dt, db; | |
d1a7c503 N |
3895 | if (mddev->curr_resync == 0) |
3896 | return sprintf(page, "none\n"); | |
9687a60c AN |
3897 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3898 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3899 | if (!dt) dt++; |
9687a60c AN |
3900 | db = resync - mddev->resync_mark_cnt; |
3901 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3902 | } |
3903 | ||
80ca3a44 | 3904 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3905 | |
3906 | static ssize_t | |
3907 | sync_completed_show(mddev_t *mddev, char *page) | |
3908 | { | |
58c0fed4 | 3909 | unsigned long max_sectors, resync; |
88202a0c | 3910 | |
acb180b0 N |
3911 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3912 | return sprintf(page, "none\n"); | |
3913 | ||
88202a0c | 3914 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3915 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3916 | else |
58c0fed4 | 3917 | max_sectors = mddev->dev_sectors; |
88202a0c | 3918 | |
acb180b0 | 3919 | resync = mddev->curr_resync_completed; |
58c0fed4 | 3920 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3921 | } |
3922 | ||
80ca3a44 | 3923 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3924 | |
5e96ee65 NB |
3925 | static ssize_t |
3926 | min_sync_show(mddev_t *mddev, char *page) | |
3927 | { | |
3928 | return sprintf(page, "%llu\n", | |
3929 | (unsigned long long)mddev->resync_min); | |
3930 | } | |
3931 | static ssize_t | |
3932 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3933 | { | |
3934 | unsigned long long min; | |
3935 | if (strict_strtoull(buf, 10, &min)) | |
3936 | return -EINVAL; | |
3937 | if (min > mddev->resync_max) | |
3938 | return -EINVAL; | |
3939 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3940 | return -EBUSY; | |
3941 | ||
3942 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3943 | if (mddev->chunk_sectors) { |
2ac06c33 | 3944 | sector_t temp = min; |
9d8f0363 | 3945 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
3946 | return -EINVAL; |
3947 | } | |
3948 | mddev->resync_min = min; | |
3949 | ||
3950 | return len; | |
3951 | } | |
3952 | ||
3953 | static struct md_sysfs_entry md_min_sync = | |
3954 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3955 | ||
c6207277 N |
3956 | static ssize_t |
3957 | max_sync_show(mddev_t *mddev, char *page) | |
3958 | { | |
3959 | if (mddev->resync_max == MaxSector) | |
3960 | return sprintf(page, "max\n"); | |
3961 | else | |
3962 | return sprintf(page, "%llu\n", | |
3963 | (unsigned long long)mddev->resync_max); | |
3964 | } | |
3965 | static ssize_t | |
3966 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3967 | { | |
3968 | if (strncmp(buf, "max", 3) == 0) | |
3969 | mddev->resync_max = MaxSector; | |
3970 | else { | |
5e96ee65 NB |
3971 | unsigned long long max; |
3972 | if (strict_strtoull(buf, 10, &max)) | |
3973 | return -EINVAL; | |
3974 | if (max < mddev->resync_min) | |
c6207277 N |
3975 | return -EINVAL; |
3976 | if (max < mddev->resync_max && | |
4d484a4a | 3977 | mddev->ro == 0 && |
c6207277 N |
3978 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3979 | return -EBUSY; | |
3980 | ||
3981 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3982 | if (mddev->chunk_sectors) { |
2ac06c33 | 3983 | sector_t temp = max; |
9d8f0363 | 3984 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
3985 | return -EINVAL; |
3986 | } | |
3987 | mddev->resync_max = max; | |
3988 | } | |
3989 | wake_up(&mddev->recovery_wait); | |
3990 | return len; | |
3991 | } | |
3992 | ||
3993 | static struct md_sysfs_entry md_max_sync = | |
3994 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3995 | ||
e464eafd N |
3996 | static ssize_t |
3997 | suspend_lo_show(mddev_t *mddev, char *page) | |
3998 | { | |
3999 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4000 | } | |
4001 | ||
4002 | static ssize_t | |
4003 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
4004 | { | |
4005 | char *e; | |
4006 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4007 | ||
b8d966ef N |
4008 | if (mddev->pers == NULL || |
4009 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4010 | return -EINVAL; |
4011 | if (buf == e || (*e && *e != '\n')) | |
4012 | return -EINVAL; | |
4013 | if (new >= mddev->suspend_hi || | |
4014 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
4015 | mddev->suspend_lo = new; | |
4016 | mddev->pers->quiesce(mddev, 2); | |
4017 | return len; | |
4018 | } else | |
4019 | return -EINVAL; | |
4020 | } | |
4021 | static struct md_sysfs_entry md_suspend_lo = | |
4022 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4023 | ||
4024 | ||
4025 | static ssize_t | |
4026 | suspend_hi_show(mddev_t *mddev, char *page) | |
4027 | { | |
4028 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4029 | } | |
4030 | ||
4031 | static ssize_t | |
4032 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
4033 | { | |
4034 | char *e; | |
4035 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4036 | ||
b8d966ef N |
4037 | if (mddev->pers == NULL || |
4038 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4039 | return -EINVAL; |
4040 | if (buf == e || (*e && *e != '\n')) | |
4041 | return -EINVAL; | |
4042 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
4043 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
4044 | mddev->suspend_hi = new; | |
4045 | mddev->pers->quiesce(mddev, 1); | |
4046 | mddev->pers->quiesce(mddev, 0); | |
4047 | return len; | |
4048 | } else | |
4049 | return -EINVAL; | |
4050 | } | |
4051 | static struct md_sysfs_entry md_suspend_hi = | |
4052 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4053 | ||
08a02ecd N |
4054 | static ssize_t |
4055 | reshape_position_show(mddev_t *mddev, char *page) | |
4056 | { | |
4057 | if (mddev->reshape_position != MaxSector) | |
4058 | return sprintf(page, "%llu\n", | |
4059 | (unsigned long long)mddev->reshape_position); | |
4060 | strcpy(page, "none\n"); | |
4061 | return 5; | |
4062 | } | |
4063 | ||
4064 | static ssize_t | |
4065 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4066 | { | |
4067 | char *e; | |
4068 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4069 | if (mddev->pers) | |
4070 | return -EBUSY; | |
4071 | if (buf == e || (*e && *e != '\n')) | |
4072 | return -EINVAL; | |
4073 | mddev->reshape_position = new; | |
4074 | mddev->delta_disks = 0; | |
4075 | mddev->new_level = mddev->level; | |
4076 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4077 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4078 | return len; |
4079 | } | |
4080 | ||
4081 | static struct md_sysfs_entry md_reshape_position = | |
4082 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4083 | reshape_position_store); | |
4084 | ||
b522adcd DW |
4085 | static ssize_t |
4086 | array_size_show(mddev_t *mddev, char *page) | |
4087 | { | |
4088 | if (mddev->external_size) | |
4089 | return sprintf(page, "%llu\n", | |
4090 | (unsigned long long)mddev->array_sectors/2); | |
4091 | else | |
4092 | return sprintf(page, "default\n"); | |
4093 | } | |
4094 | ||
4095 | static ssize_t | |
4096 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4097 | { | |
4098 | sector_t sectors; | |
4099 | ||
4100 | if (strncmp(buf, "default", 7) == 0) { | |
4101 | if (mddev->pers) | |
4102 | sectors = mddev->pers->size(mddev, 0, 0); | |
4103 | else | |
4104 | sectors = mddev->array_sectors; | |
4105 | ||
4106 | mddev->external_size = 0; | |
4107 | } else { | |
4108 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4109 | return -EINVAL; | |
4110 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4111 | return -E2BIG; |
b522adcd DW |
4112 | |
4113 | mddev->external_size = 1; | |
4114 | } | |
4115 | ||
4116 | mddev->array_sectors = sectors; | |
4117 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e N |
4118 | if (mddev->pers) |
4119 | revalidate_disk(mddev->gendisk); | |
b522adcd DW |
4120 | |
4121 | return len; | |
4122 | } | |
4123 | ||
4124 | static struct md_sysfs_entry md_array_size = | |
4125 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4126 | array_size_store); | |
e464eafd | 4127 | |
eae1701f N |
4128 | static struct attribute *md_default_attrs[] = { |
4129 | &md_level.attr, | |
d4dbd025 | 4130 | &md_layout.attr, |
eae1701f | 4131 | &md_raid_disks.attr, |
3b34380a | 4132 | &md_chunk_size.attr, |
a35b0d69 | 4133 | &md_size.attr, |
a94213b1 | 4134 | &md_resync_start.attr, |
8bb93aac | 4135 | &md_metadata.attr, |
6d7ff738 | 4136 | &md_new_device.attr, |
16f17b39 | 4137 | &md_safe_delay.attr, |
9e653b63 | 4138 | &md_array_state.attr, |
08a02ecd | 4139 | &md_reshape_position.attr, |
b522adcd | 4140 | &md_array_size.attr, |
1e50915f | 4141 | &max_corr_read_errors.attr, |
411036fa N |
4142 | NULL, |
4143 | }; | |
4144 | ||
4145 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4146 | &md_scan_mode.attr, |
9d88883e | 4147 | &md_mismatches.attr, |
88202a0c N |
4148 | &md_sync_min.attr, |
4149 | &md_sync_max.attr, | |
4150 | &md_sync_speed.attr, | |
90b08710 | 4151 | &md_sync_force_parallel.attr, |
88202a0c | 4152 | &md_sync_completed.attr, |
5e96ee65 | 4153 | &md_min_sync.attr, |
c6207277 | 4154 | &md_max_sync.attr, |
e464eafd N |
4155 | &md_suspend_lo.attr, |
4156 | &md_suspend_hi.attr, | |
9b1d1dac | 4157 | &md_bitmap.attr, |
d7f3d291 | 4158 | &md_degraded.attr, |
eae1701f N |
4159 | NULL, |
4160 | }; | |
411036fa N |
4161 | static struct attribute_group md_redundancy_group = { |
4162 | .name = NULL, | |
4163 | .attrs = md_redundancy_attrs, | |
4164 | }; | |
4165 | ||
eae1701f N |
4166 | |
4167 | static ssize_t | |
4168 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4169 | { | |
4170 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4171 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4172 | ssize_t rv; |
eae1701f N |
4173 | |
4174 | if (!entry->show) | |
4175 | return -EIO; | |
5dc5cf7d IM |
4176 | rv = mddev_lock(mddev); |
4177 | if (!rv) { | |
4178 | rv = entry->show(mddev, page); | |
4179 | mddev_unlock(mddev); | |
4180 | } | |
96de1e66 | 4181 | return rv; |
eae1701f N |
4182 | } |
4183 | ||
4184 | static ssize_t | |
4185 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4186 | const char *page, size_t length) | |
4187 | { | |
4188 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4189 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4190 | ssize_t rv; |
eae1701f N |
4191 | |
4192 | if (!entry->store) | |
4193 | return -EIO; | |
67463acb N |
4194 | if (!capable(CAP_SYS_ADMIN)) |
4195 | return -EACCES; | |
5dc5cf7d | 4196 | rv = mddev_lock(mddev); |
d3374825 N |
4197 | if (mddev->hold_active == UNTIL_IOCTL) |
4198 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4199 | if (!rv) { |
4200 | rv = entry->store(mddev, page, length); | |
4201 | mddev_unlock(mddev); | |
4202 | } | |
96de1e66 | 4203 | return rv; |
eae1701f N |
4204 | } |
4205 | ||
4206 | static void md_free(struct kobject *ko) | |
4207 | { | |
4208 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4209 | |
4210 | if (mddev->sysfs_state) | |
4211 | sysfs_put(mddev->sysfs_state); | |
4212 | ||
4213 | if (mddev->gendisk) { | |
4214 | del_gendisk(mddev->gendisk); | |
4215 | put_disk(mddev->gendisk); | |
4216 | } | |
4217 | if (mddev->queue) | |
4218 | blk_cleanup_queue(mddev->queue); | |
4219 | ||
eae1701f N |
4220 | kfree(mddev); |
4221 | } | |
4222 | ||
52cf25d0 | 4223 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4224 | .show = md_attr_show, |
4225 | .store = md_attr_store, | |
4226 | }; | |
4227 | static struct kobj_type md_ktype = { | |
4228 | .release = md_free, | |
4229 | .sysfs_ops = &md_sysfs_ops, | |
4230 | .default_attrs = md_default_attrs, | |
4231 | }; | |
4232 | ||
1da177e4 LT |
4233 | int mdp_major = 0; |
4234 | ||
5fd3a17e DW |
4235 | static void mddev_delayed_delete(struct work_struct *ws) |
4236 | { | |
4237 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4238 | ||
43a70507 | 4239 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4240 | kobject_del(&mddev->kobj); |
4241 | kobject_put(&mddev->kobj); | |
4242 | } | |
4243 | ||
efeb53c0 | 4244 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4245 | { |
48c9c27b | 4246 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4247 | mddev_t *mddev = mddev_find(dev); |
4248 | struct gendisk *disk; | |
efeb53c0 N |
4249 | int partitioned; |
4250 | int shift; | |
4251 | int unit; | |
3830c62f | 4252 | int error; |
1da177e4 LT |
4253 | |
4254 | if (!mddev) | |
efeb53c0 N |
4255 | return -ENODEV; |
4256 | ||
4257 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4258 | shift = partitioned ? MdpMinorShift : 0; | |
4259 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4260 | |
d3374825 N |
4261 | /* wait for any previous instance if this device |
4262 | * to be completed removed (mddev_delayed_delete). | |
4263 | */ | |
4264 | flush_scheduled_work(); | |
4265 | ||
48c9c27b | 4266 | mutex_lock(&disks_mutex); |
0909dc44 N |
4267 | error = -EEXIST; |
4268 | if (mddev->gendisk) | |
4269 | goto abort; | |
efeb53c0 N |
4270 | |
4271 | if (name) { | |
4272 | /* Need to ensure that 'name' is not a duplicate. | |
4273 | */ | |
4274 | mddev_t *mddev2; | |
4275 | spin_lock(&all_mddevs_lock); | |
4276 | ||
4277 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4278 | if (mddev2->gendisk && | |
4279 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4280 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4281 | goto abort; |
efeb53c0 N |
4282 | } |
4283 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4284 | } |
8b765398 | 4285 | |
0909dc44 | 4286 | error = -ENOMEM; |
8b765398 | 4287 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4288 | if (!mddev->queue) |
4289 | goto abort; | |
409c57f3 N |
4290 | mddev->queue->queuedata = mddev; |
4291 | ||
8b765398 N |
4292 | /* Can be unlocked because the queue is new: no concurrency */ |
4293 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
4294 | ||
409c57f3 | 4295 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4296 | |
1da177e4 LT |
4297 | disk = alloc_disk(1 << shift); |
4298 | if (!disk) { | |
8b765398 N |
4299 | blk_cleanup_queue(mddev->queue); |
4300 | mddev->queue = NULL; | |
0909dc44 | 4301 | goto abort; |
1da177e4 | 4302 | } |
efeb53c0 | 4303 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4304 | disk->first_minor = unit << shift; |
efeb53c0 N |
4305 | if (name) |
4306 | strcpy(disk->disk_name, name); | |
4307 | else if (partitioned) | |
1da177e4 | 4308 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4309 | else |
1da177e4 | 4310 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4311 | disk->fops = &md_fops; |
4312 | disk->private_data = mddev; | |
4313 | disk->queue = mddev->queue; | |
92850bbd | 4314 | /* Allow extended partitions. This makes the |
d3374825 | 4315 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4316 | * remove it now. |
4317 | */ | |
4318 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
4319 | add_disk(disk); |
4320 | mddev->gendisk = disk; | |
ed9e1982 TH |
4321 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4322 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4323 | if (error) { |
4324 | /* This isn't possible, but as kobject_init_and_add is marked | |
4325 | * __must_check, we must do something with the result | |
4326 | */ | |
5e55e2f5 N |
4327 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4328 | disk->disk_name); | |
0909dc44 N |
4329 | error = 0; |
4330 | } | |
00bcb4ac N |
4331 | if (mddev->kobj.sd && |
4332 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4333 | printk(KERN_DEBUG "pointless warning\n"); |
0909dc44 N |
4334 | abort: |
4335 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4336 | if (!error && mddev->kobj.sd) { |
3830c62f | 4337 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4338 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4339 | } |
d3374825 | 4340 | mddev_put(mddev); |
0909dc44 | 4341 | return error; |
efeb53c0 N |
4342 | } |
4343 | ||
4344 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4345 | { | |
4346 | md_alloc(dev, NULL); | |
1da177e4 LT |
4347 | return NULL; |
4348 | } | |
4349 | ||
efeb53c0 N |
4350 | static int add_named_array(const char *val, struct kernel_param *kp) |
4351 | { | |
4352 | /* val must be "md_*" where * is not all digits. | |
4353 | * We allocate an array with a large free minor number, and | |
4354 | * set the name to val. val must not already be an active name. | |
4355 | */ | |
4356 | int len = strlen(val); | |
4357 | char buf[DISK_NAME_LEN]; | |
4358 | ||
4359 | while (len && val[len-1] == '\n') | |
4360 | len--; | |
4361 | if (len >= DISK_NAME_LEN) | |
4362 | return -E2BIG; | |
4363 | strlcpy(buf, val, len+1); | |
4364 | if (strncmp(buf, "md_", 3) != 0) | |
4365 | return -EINVAL; | |
4366 | return md_alloc(0, buf); | |
4367 | } | |
4368 | ||
1da177e4 LT |
4369 | static void md_safemode_timeout(unsigned long data) |
4370 | { | |
4371 | mddev_t *mddev = (mddev_t *) data; | |
4372 | ||
0fd62b86 NB |
4373 | if (!atomic_read(&mddev->writes_pending)) { |
4374 | mddev->safemode = 1; | |
4375 | if (mddev->external) | |
00bcb4ac | 4376 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4377 | } |
1da177e4 LT |
4378 | md_wakeup_thread(mddev->thread); |
4379 | } | |
4380 | ||
6ff8d8ec | 4381 | static int start_dirty_degraded; |
1da177e4 | 4382 | |
390ee602 | 4383 | int md_run(mddev_t *mddev) |
1da177e4 | 4384 | { |
2604b703 | 4385 | int err; |
1da177e4 | 4386 | mdk_rdev_t *rdev; |
2604b703 | 4387 | struct mdk_personality *pers; |
1da177e4 | 4388 | |
a757e64c N |
4389 | if (list_empty(&mddev->disks)) |
4390 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4391 | return -EINVAL; |
1da177e4 LT |
4392 | |
4393 | if (mddev->pers) | |
4394 | return -EBUSY; | |
bb4f1e9d N |
4395 | /* Cannot run until previous stop completes properly */ |
4396 | if (mddev->sysfs_active) | |
4397 | return -EBUSY; | |
b6eb127d | 4398 | |
1da177e4 LT |
4399 | /* |
4400 | * Analyze all RAID superblock(s) | |
4401 | */ | |
1ec4a939 N |
4402 | if (!mddev->raid_disks) { |
4403 | if (!mddev->persistent) | |
4404 | return -EINVAL; | |
a757e64c | 4405 | analyze_sbs(mddev); |
1ec4a939 | 4406 | } |
1da177e4 | 4407 | |
d9d166c2 N |
4408 | if (mddev->level != LEVEL_NONE) |
4409 | request_module("md-level-%d", mddev->level); | |
4410 | else if (mddev->clevel[0]) | |
4411 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4412 | |
4413 | /* | |
4414 | * Drop all container device buffers, from now on | |
4415 | * the only valid external interface is through the md | |
4416 | * device. | |
1da177e4 | 4417 | */ |
159ec1fc | 4418 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4419 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4420 | continue; |
4421 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4422 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4423 | |
4424 | /* perform some consistency tests on the device. | |
4425 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4426 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4427 | */ |
0f420358 | 4428 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4429 | if (mddev->dev_sectors && |
4430 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4431 | > rdev->sb_start) { |
f0d76d70 N |
4432 | printk("md: %s: data overlaps metadata\n", |
4433 | mdname(mddev)); | |
4434 | return -EINVAL; | |
4435 | } | |
4436 | } else { | |
0f420358 | 4437 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4438 | > rdev->data_offset) { |
4439 | printk("md: %s: metadata overlaps data\n", | |
4440 | mdname(mddev)); | |
4441 | return -EINVAL; | |
4442 | } | |
4443 | } | |
00bcb4ac | 4444 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4445 | } |
4446 | ||
1da177e4 | 4447 | spin_lock(&pers_lock); |
d9d166c2 | 4448 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4449 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4450 | spin_unlock(&pers_lock); |
d9d166c2 N |
4451 | if (mddev->level != LEVEL_NONE) |
4452 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4453 | mddev->level); | |
4454 | else | |
4455 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4456 | mddev->clevel); | |
1da177e4 LT |
4457 | return -EINVAL; |
4458 | } | |
2604b703 | 4459 | mddev->pers = pers; |
1da177e4 | 4460 | spin_unlock(&pers_lock); |
34817e8c N |
4461 | if (mddev->level != pers->level) { |
4462 | mddev->level = pers->level; | |
4463 | mddev->new_level = pers->level; | |
4464 | } | |
d9d166c2 | 4465 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4466 | |
f6705578 | 4467 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4468 | pers->start_reshape == NULL) { |
f6705578 N |
4469 | /* This personality cannot handle reshaping... */ |
4470 | mddev->pers = NULL; | |
4471 | module_put(pers->owner); | |
4472 | return -EINVAL; | |
4473 | } | |
4474 | ||
7dd5e7c3 N |
4475 | if (pers->sync_request) { |
4476 | /* Warn if this is a potentially silly | |
4477 | * configuration. | |
4478 | */ | |
4479 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4480 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4481 | int warned = 0; |
159ec1fc CR |
4482 | |
4483 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4484 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4485 | if (rdev < rdev2 && |
4486 | rdev->bdev->bd_contains == | |
4487 | rdev2->bdev->bd_contains) { | |
4488 | printk(KERN_WARNING | |
4489 | "%s: WARNING: %s appears to be" | |
4490 | " on the same physical disk as" | |
4491 | " %s.\n", | |
4492 | mdname(mddev), | |
4493 | bdevname(rdev->bdev,b), | |
4494 | bdevname(rdev2->bdev,b2)); | |
4495 | warned = 1; | |
4496 | } | |
4497 | } | |
159ec1fc | 4498 | |
7dd5e7c3 N |
4499 | if (warned) |
4500 | printk(KERN_WARNING | |
4501 | "True protection against single-disk" | |
4502 | " failure might be compromised.\n"); | |
4503 | } | |
4504 | ||
657390d2 | 4505 | mddev->recovery = 0; |
58c0fed4 AN |
4506 | /* may be over-ridden by personality */ |
4507 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4508 | ||
a9701a30 | 4509 | mddev->barriers_work = 1; |
6ff8d8ec | 4510 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4511 | |
0f9552b5 | 4512 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4513 | mddev->ro = 2; /* read-only, but switch on first write */ |
4514 | ||
b15c2e57 | 4515 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4516 | if (err) |
4517 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4518 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4519 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4520 | " but 'external_size' not in effect?\n", __func__); | |
4521 | printk(KERN_ERR | |
4522 | "md: invalid array_size %llu > default size %llu\n", | |
4523 | (unsigned long long)mddev->array_sectors / 2, | |
4524 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4525 | err = -EINVAL; | |
4526 | mddev->pers->stop(mddev); | |
4527 | } | |
4528 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4529 | err = bitmap_create(mddev); |
4530 | if (err) { | |
4531 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4532 | mdname(mddev), err); | |
4533 | mddev->pers->stop(mddev); | |
4534 | } | |
4535 | } | |
1da177e4 | 4536 | if (err) { |
1da177e4 LT |
4537 | module_put(mddev->pers->owner); |
4538 | mddev->pers = NULL; | |
32a7627c N |
4539 | bitmap_destroy(mddev); |
4540 | return err; | |
1da177e4 | 4541 | } |
5e55e2f5 | 4542 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4543 | if (mddev->kobj.sd && |
4544 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4545 | printk(KERN_WARNING |
4546 | "md: cannot register extra attributes for %s\n", | |
4547 | mdname(mddev)); | |
00bcb4ac | 4548 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4549 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4550 | mddev->ro = 0; |
4551 | ||
1da177e4 | 4552 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4553 | atomic_set(&mddev->max_corr_read_errors, |
4554 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4555 | mddev->safemode = 0; |
4556 | mddev->safemode_timer.function = md_safemode_timeout; | |
4557 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4558 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4559 | mddev->in_sync = 1; |
86e6ffdd | 4560 | |
159ec1fc | 4561 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4562 | if (rdev->raid_disk >= 0) { |
4563 | char nm[20]; | |
4564 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 | 4565 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
00bcb4ac | 4566 | /* failure here is OK */; |
86e6ffdd | 4567 | } |
1da177e4 LT |
4568 | |
4569 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4570 | ||
850b2b42 N |
4571 | if (mddev->flags) |
4572 | md_update_sb(mddev, 0); | |
1da177e4 | 4573 | |
0b8c9de0 N |
4574 | md_wakeup_thread(mddev->thread); |
4575 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4576 | |
d7603b7e | 4577 | md_new_event(mddev); |
00bcb4ac N |
4578 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4579 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4580 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4581 | return 0; |
4582 | } | |
390ee602 | 4583 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4584 | |
fe60b014 N |
4585 | static int do_md_run(mddev_t *mddev) |
4586 | { | |
4587 | int err; | |
4588 | ||
4589 | err = md_run(mddev); | |
4590 | if (err) | |
4591 | goto out; | |
69e51b44 N |
4592 | err = bitmap_load(mddev); |
4593 | if (err) { | |
4594 | bitmap_destroy(mddev); | |
4595 | goto out; | |
4596 | } | |
fe60b014 N |
4597 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4598 | revalidate_disk(mddev->gendisk); | |
4599 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); | |
4600 | out: | |
4601 | return err; | |
4602 | } | |
4603 | ||
1da177e4 LT |
4604 | static int restart_array(mddev_t *mddev) |
4605 | { | |
4606 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4607 | |
80fab1d7 | 4608 | /* Complain if it has no devices */ |
1da177e4 | 4609 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4610 | return -ENXIO; |
4611 | if (!mddev->pers) | |
4612 | return -EINVAL; | |
4613 | if (!mddev->ro) | |
4614 | return -EBUSY; | |
4615 | mddev->safemode = 0; | |
4616 | mddev->ro = 0; | |
4617 | set_disk_ro(disk, 0); | |
4618 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4619 | mdname(mddev)); | |
4620 | /* Kick recovery or resync if necessary */ | |
4621 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4622 | md_wakeup_thread(mddev->thread); | |
4623 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4624 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4625 | return 0; |
1da177e4 LT |
4626 | } |
4627 | ||
acc55e22 N |
4628 | /* similar to deny_write_access, but accounts for our holding a reference |
4629 | * to the file ourselves */ | |
4630 | static int deny_bitmap_write_access(struct file * file) | |
4631 | { | |
4632 | struct inode *inode = file->f_mapping->host; | |
4633 | ||
4634 | spin_lock(&inode->i_lock); | |
4635 | if (atomic_read(&inode->i_writecount) > 1) { | |
4636 | spin_unlock(&inode->i_lock); | |
4637 | return -ETXTBSY; | |
4638 | } | |
4639 | atomic_set(&inode->i_writecount, -1); | |
4640 | spin_unlock(&inode->i_lock); | |
4641 | ||
4642 | return 0; | |
4643 | } | |
4644 | ||
43a70507 | 4645 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4646 | { |
4647 | struct inode *inode = file->f_mapping->host; | |
4648 | ||
4649 | spin_lock(&inode->i_lock); | |
4650 | atomic_set(&inode->i_writecount, 1); | |
4651 | spin_unlock(&inode->i_lock); | |
4652 | } | |
4653 | ||
6177b472 N |
4654 | static void md_clean(mddev_t *mddev) |
4655 | { | |
4656 | mddev->array_sectors = 0; | |
4657 | mddev->external_size = 0; | |
4658 | mddev->dev_sectors = 0; | |
4659 | mddev->raid_disks = 0; | |
4660 | mddev->recovery_cp = 0; | |
4661 | mddev->resync_min = 0; | |
4662 | mddev->resync_max = MaxSector; | |
4663 | mddev->reshape_position = MaxSector; | |
4664 | mddev->external = 0; | |
4665 | mddev->persistent = 0; | |
4666 | mddev->level = LEVEL_NONE; | |
4667 | mddev->clevel[0] = 0; | |
4668 | mddev->flags = 0; | |
4669 | mddev->ro = 0; | |
4670 | mddev->metadata_type[0] = 0; | |
4671 | mddev->chunk_sectors = 0; | |
4672 | mddev->ctime = mddev->utime = 0; | |
4673 | mddev->layout = 0; | |
4674 | mddev->max_disks = 0; | |
4675 | mddev->events = 0; | |
a8707c08 | 4676 | mddev->can_decrease_events = 0; |
6177b472 N |
4677 | mddev->delta_disks = 0; |
4678 | mddev->new_level = LEVEL_NONE; | |
4679 | mddev->new_layout = 0; | |
4680 | mddev->new_chunk_sectors = 0; | |
4681 | mddev->curr_resync = 0; | |
4682 | mddev->resync_mismatches = 0; | |
4683 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4684 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4685 | mddev->recovery = 0; | |
4686 | mddev->in_sync = 0; | |
4687 | mddev->degraded = 0; | |
4688 | mddev->barriers_work = 0; | |
4689 | mddev->safemode = 0; | |
4690 | mddev->bitmap_info.offset = 0; | |
4691 | mddev->bitmap_info.default_offset = 0; | |
4692 | mddev->bitmap_info.chunksize = 0; | |
4693 | mddev->bitmap_info.daemon_sleep = 0; | |
4694 | mddev->bitmap_info.max_write_behind = 0; | |
252ac522 | 4695 | mddev->plug = NULL; |
6177b472 N |
4696 | } |
4697 | ||
390ee602 | 4698 | void md_stop_writes(mddev_t *mddev) |
a047e125 N |
4699 | { |
4700 | if (mddev->sync_thread) { | |
4701 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4702 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4703 | md_unregister_thread(mddev->sync_thread); | |
4704 | mddev->sync_thread = NULL; | |
4705 | } | |
4706 | ||
4707 | del_timer_sync(&mddev->safemode_timer); | |
4708 | ||
4709 | bitmap_flush(mddev); | |
4710 | md_super_wait(mddev); | |
4711 | ||
4712 | if (!mddev->in_sync || mddev->flags) { | |
4713 | /* mark array as shutdown cleanly */ | |
4714 | mddev->in_sync = 1; | |
4715 | md_update_sb(mddev, 1); | |
4716 | } | |
4717 | } | |
390ee602 | 4718 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 4719 | |
390ee602 | 4720 | void md_stop(mddev_t *mddev) |
6177b472 N |
4721 | { |
4722 | mddev->pers->stop(mddev); | |
4723 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4724 | mddev->to_remove = &md_redundancy_group; | |
4725 | module_put(mddev->pers->owner); | |
4726 | mddev->pers = NULL; | |
cca9cf90 | 4727 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 4728 | } |
390ee602 | 4729 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 4730 | |
a4bd82d0 N |
4731 | static int md_set_readonly(mddev_t *mddev, int is_open) |
4732 | { | |
4733 | int err = 0; | |
4734 | mutex_lock(&mddev->open_mutex); | |
4735 | if (atomic_read(&mddev->openers) > is_open) { | |
4736 | printk("md: %s still in use.\n",mdname(mddev)); | |
4737 | err = -EBUSY; | |
4738 | goto out; | |
4739 | } | |
4740 | if (mddev->pers) { | |
4741 | md_stop_writes(mddev); | |
4742 | ||
4743 | err = -ENXIO; | |
4744 | if (mddev->ro==1) | |
4745 | goto out; | |
4746 | mddev->ro = 1; | |
4747 | set_disk_ro(mddev->gendisk, 1); | |
4748 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 4749 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
4750 | err = 0; |
4751 | } | |
4752 | out: | |
4753 | mutex_unlock(&mddev->open_mutex); | |
4754 | return err; | |
4755 | } | |
4756 | ||
9e653b63 N |
4757 | /* mode: |
4758 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
4759 | * 2 - stop but do not disassemble array |
4760 | */ | |
df5b20cf | 4761 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 | 4762 | { |
1da177e4 | 4763 | struct gendisk *disk = mddev->gendisk; |
c4647292 | 4764 | mdk_rdev_t *rdev; |
1da177e4 | 4765 | |
c8c00a69 | 4766 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
4767 | if (atomic_read(&mddev->openers) > is_open || |
4768 | mddev->sysfs_active) { | |
df5b20cf | 4769 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
4770 | mutex_unlock(&mddev->open_mutex); |
4771 | return -EBUSY; | |
4772 | } | |
1da177e4 | 4773 | |
6e17b027 | 4774 | if (mddev->pers) { |
a4bd82d0 N |
4775 | if (mddev->ro) |
4776 | set_disk_ro(disk, 0); | |
409c57f3 | 4777 | |
390ee602 | 4778 | md_stop_writes(mddev); |
a4bd82d0 N |
4779 | md_stop(mddev); |
4780 | mddev->queue->merge_bvec_fn = NULL; | |
4781 | mddev->queue->unplug_fn = NULL; | |
4782 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
6177b472 | 4783 | |
a4bd82d0 | 4784 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 4785 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 4786 | |
a4bd82d0 N |
4787 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4788 | if (rdev->raid_disk >= 0) { | |
4789 | char nm[20]; | |
4790 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4791 | sysfs_remove_link(&mddev->kobj, nm); | |
4792 | } | |
c4647292 | 4793 | |
a4bd82d0 | 4794 | set_capacity(disk, 0); |
6e17b027 | 4795 | mutex_unlock(&mddev->open_mutex); |
a4bd82d0 | 4796 | revalidate_disk(disk); |
0d4ca600 | 4797 | |
a4bd82d0 N |
4798 | if (mddev->ro) |
4799 | mddev->ro = 0; | |
6e17b027 N |
4800 | } else |
4801 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
4802 | /* |
4803 | * Free resources if final stop | |
4804 | */ | |
9e653b63 | 4805 | if (mode == 0) { |
1da177e4 LT |
4806 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4807 | ||
978f946b | 4808 | bitmap_destroy(mddev); |
c3d9714e N |
4809 | if (mddev->bitmap_info.file) { |
4810 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4811 | fput(mddev->bitmap_info.file); | |
4812 | mddev->bitmap_info.file = NULL; | |
978f946b | 4813 | } |
c3d9714e | 4814 | mddev->bitmap_info.offset = 0; |
978f946b | 4815 | |
1da177e4 LT |
4816 | export_array(mddev); |
4817 | ||
6177b472 | 4818 | md_clean(mddev); |
934d9c23 | 4819 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4820 | if (mddev->hold_active == UNTIL_STOP) |
4821 | mddev->hold_active = 0; | |
a4bd82d0 | 4822 | } |
3f9d99c1 | 4823 | blk_integrity_unregister(disk); |
d7603b7e | 4824 | md_new_event(mddev); |
00bcb4ac | 4825 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 4826 | return 0; |
1da177e4 LT |
4827 | } |
4828 | ||
fdee8ae4 | 4829 | #ifndef MODULE |
1da177e4 LT |
4830 | static void autorun_array(mddev_t *mddev) |
4831 | { | |
4832 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4833 | int err; |
4834 | ||
a757e64c | 4835 | if (list_empty(&mddev->disks)) |
1da177e4 | 4836 | return; |
1da177e4 LT |
4837 | |
4838 | printk(KERN_INFO "md: running: "); | |
4839 | ||
159ec1fc | 4840 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4841 | char b[BDEVNAME_SIZE]; |
4842 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4843 | } | |
4844 | printk("\n"); | |
4845 | ||
d710e138 | 4846 | err = do_md_run(mddev); |
1da177e4 LT |
4847 | if (err) { |
4848 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4849 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4850 | } |
4851 | } | |
4852 | ||
4853 | /* | |
4854 | * lets try to run arrays based on all disks that have arrived | |
4855 | * until now. (those are in pending_raid_disks) | |
4856 | * | |
4857 | * the method: pick the first pending disk, collect all disks with | |
4858 | * the same UUID, remove all from the pending list and put them into | |
4859 | * the 'same_array' list. Then order this list based on superblock | |
4860 | * update time (freshest comes first), kick out 'old' disks and | |
4861 | * compare superblocks. If everything's fine then run it. | |
4862 | * | |
4863 | * If "unit" is allocated, then bump its reference count | |
4864 | */ | |
4865 | static void autorun_devices(int part) | |
4866 | { | |
159ec1fc | 4867 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4868 | mddev_t *mddev; |
4869 | char b[BDEVNAME_SIZE]; | |
4870 | ||
4871 | printk(KERN_INFO "md: autorun ...\n"); | |
4872 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4873 | int unit; |
1da177e4 | 4874 | dev_t dev; |
ad01c9e3 | 4875 | LIST_HEAD(candidates); |
1da177e4 LT |
4876 | rdev0 = list_entry(pending_raid_disks.next, |
4877 | mdk_rdev_t, same_set); | |
4878 | ||
4879 | printk(KERN_INFO "md: considering %s ...\n", | |
4880 | bdevname(rdev0->bdev,b)); | |
4881 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4882 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4883 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4884 | printk(KERN_INFO "md: adding %s ...\n", | |
4885 | bdevname(rdev->bdev,b)); | |
4886 | list_move(&rdev->same_set, &candidates); | |
4887 | } | |
4888 | /* | |
4889 | * now we have a set of devices, with all of them having | |
4890 | * mostly sane superblocks. It's time to allocate the | |
4891 | * mddev. | |
4892 | */ | |
e8703fe1 N |
4893 | if (part) { |
4894 | dev = MKDEV(mdp_major, | |
4895 | rdev0->preferred_minor << MdpMinorShift); | |
4896 | unit = MINOR(dev) >> MdpMinorShift; | |
4897 | } else { | |
4898 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4899 | unit = MINOR(dev); | |
4900 | } | |
4901 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4902 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4903 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4904 | break; | |
4905 | } | |
1da177e4 LT |
4906 | |
4907 | md_probe(dev, NULL, NULL); | |
4908 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4909 | if (!mddev || !mddev->gendisk) { |
4910 | if (mddev) | |
4911 | mddev_put(mddev); | |
4912 | printk(KERN_ERR | |
1da177e4 LT |
4913 | "md: cannot allocate memory for md drive.\n"); |
4914 | break; | |
4915 | } | |
4916 | if (mddev_lock(mddev)) | |
4917 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4918 | mdname(mddev)); | |
4919 | else if (mddev->raid_disks || mddev->major_version | |
4920 | || !list_empty(&mddev->disks)) { | |
4921 | printk(KERN_WARNING | |
4922 | "md: %s already running, cannot run %s\n", | |
4923 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4924 | mddev_unlock(mddev); | |
4925 | } else { | |
4926 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4927 | mddev->persistent = 1; |
159ec1fc | 4928 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4929 | list_del_init(&rdev->same_set); |
4930 | if (bind_rdev_to_array(rdev, mddev)) | |
4931 | export_rdev(rdev); | |
4932 | } | |
4933 | autorun_array(mddev); | |
4934 | mddev_unlock(mddev); | |
4935 | } | |
4936 | /* on success, candidates will be empty, on error | |
4937 | * it won't... | |
4938 | */ | |
159ec1fc | 4939 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4940 | list_del_init(&rdev->same_set); |
1da177e4 | 4941 | export_rdev(rdev); |
4b80991c | 4942 | } |
1da177e4 LT |
4943 | mddev_put(mddev); |
4944 | } | |
4945 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4946 | } | |
fdee8ae4 | 4947 | #endif /* !MODULE */ |
1da177e4 | 4948 | |
1da177e4 LT |
4949 | static int get_version(void __user * arg) |
4950 | { | |
4951 | mdu_version_t ver; | |
4952 | ||
4953 | ver.major = MD_MAJOR_VERSION; | |
4954 | ver.minor = MD_MINOR_VERSION; | |
4955 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4956 | ||
4957 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4958 | return -EFAULT; | |
4959 | ||
4960 | return 0; | |
4961 | } | |
4962 | ||
4963 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4964 | { | |
4965 | mdu_array_info_t info; | |
a9f326eb | 4966 | int nr,working,insync,failed,spare; |
1da177e4 | 4967 | mdk_rdev_t *rdev; |
1da177e4 | 4968 | |
a9f326eb | 4969 | nr=working=insync=failed=spare=0; |
159ec1fc | 4970 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4971 | nr++; |
b2d444d7 | 4972 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4973 | failed++; |
4974 | else { | |
4975 | working++; | |
b2d444d7 | 4976 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 4977 | insync++; |
1da177e4 LT |
4978 | else |
4979 | spare++; | |
4980 | } | |
4981 | } | |
4982 | ||
4983 | info.major_version = mddev->major_version; | |
4984 | info.minor_version = mddev->minor_version; | |
4985 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4986 | info.ctime = mddev->ctime; | |
4987 | info.level = mddev->level; | |
58c0fed4 AN |
4988 | info.size = mddev->dev_sectors / 2; |
4989 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4990 | info.size = -1; |
1da177e4 LT |
4991 | info.nr_disks = nr; |
4992 | info.raid_disks = mddev->raid_disks; | |
4993 | info.md_minor = mddev->md_minor; | |
4994 | info.not_persistent= !mddev->persistent; | |
4995 | ||
4996 | info.utime = mddev->utime; | |
4997 | info.state = 0; | |
4998 | if (mddev->in_sync) | |
4999 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5000 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5001 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5002 | info.active_disks = insync; |
1da177e4 LT |
5003 | info.working_disks = working; |
5004 | info.failed_disks = failed; | |
5005 | info.spare_disks = spare; | |
5006 | ||
5007 | info.layout = mddev->layout; | |
9d8f0363 | 5008 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5009 | |
5010 | if (copy_to_user(arg, &info, sizeof(info))) | |
5011 | return -EFAULT; | |
5012 | ||
5013 | return 0; | |
5014 | } | |
5015 | ||
87162a28 | 5016 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
5017 | { |
5018 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5019 | char *ptr, *buf = NULL; | |
5020 | int err = -ENOMEM; | |
5021 | ||
b5470dc5 DW |
5022 | if (md_allow_write(mddev)) |
5023 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5024 | else | |
5025 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5026 | |
32a7627c N |
5027 | if (!file) |
5028 | goto out; | |
5029 | ||
5030 | /* bitmap disabled, zero the first byte and copy out */ | |
5031 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5032 | file->pathname[0] = '\0'; | |
5033 | goto copy_out; | |
5034 | } | |
5035 | ||
5036 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5037 | if (!buf) | |
5038 | goto out; | |
5039 | ||
6bcfd601 CH |
5040 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5041 | if (IS_ERR(ptr)) | |
32a7627c N |
5042 | goto out; |
5043 | ||
5044 | strcpy(file->pathname, ptr); | |
5045 | ||
5046 | copy_out: | |
5047 | err = 0; | |
5048 | if (copy_to_user(arg, file, sizeof(*file))) | |
5049 | err = -EFAULT; | |
5050 | out: | |
5051 | kfree(buf); | |
5052 | kfree(file); | |
5053 | return err; | |
5054 | } | |
5055 | ||
1da177e4 LT |
5056 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
5057 | { | |
5058 | mdu_disk_info_t info; | |
1da177e4 LT |
5059 | mdk_rdev_t *rdev; |
5060 | ||
5061 | if (copy_from_user(&info, arg, sizeof(info))) | |
5062 | return -EFAULT; | |
5063 | ||
26ef379f | 5064 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5065 | if (rdev) { |
5066 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5067 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5068 | info.raid_disk = rdev->raid_disk; | |
5069 | info.state = 0; | |
b2d444d7 | 5070 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5071 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5072 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5073 | info.state |= (1<<MD_DISK_ACTIVE); |
5074 | info.state |= (1<<MD_DISK_SYNC); | |
5075 | } | |
8ddf9efe N |
5076 | if (test_bit(WriteMostly, &rdev->flags)) |
5077 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5078 | } else { |
5079 | info.major = info.minor = 0; | |
5080 | info.raid_disk = -1; | |
5081 | info.state = (1<<MD_DISK_REMOVED); | |
5082 | } | |
5083 | ||
5084 | if (copy_to_user(arg, &info, sizeof(info))) | |
5085 | return -EFAULT; | |
5086 | ||
5087 | return 0; | |
5088 | } | |
5089 | ||
5090 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5091 | { | |
5092 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5093 | mdk_rdev_t *rdev; | |
5094 | dev_t dev = MKDEV(info->major,info->minor); | |
5095 | ||
5096 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5097 | return -EOVERFLOW; | |
5098 | ||
5099 | if (!mddev->raid_disks) { | |
5100 | int err; | |
5101 | /* expecting a device which has a superblock */ | |
5102 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5103 | if (IS_ERR(rdev)) { | |
5104 | printk(KERN_WARNING | |
5105 | "md: md_import_device returned %ld\n", | |
5106 | PTR_ERR(rdev)); | |
5107 | return PTR_ERR(rdev); | |
5108 | } | |
5109 | if (!list_empty(&mddev->disks)) { | |
5110 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5111 | mdk_rdev_t, same_set); | |
a9f326eb | 5112 | err = super_types[mddev->major_version] |
1da177e4 LT |
5113 | .load_super(rdev, rdev0, mddev->minor_version); |
5114 | if (err < 0) { | |
5115 | printk(KERN_WARNING | |
5116 | "md: %s has different UUID to %s\n", | |
5117 | bdevname(rdev->bdev,b), | |
5118 | bdevname(rdev0->bdev,b2)); | |
5119 | export_rdev(rdev); | |
5120 | return -EINVAL; | |
5121 | } | |
5122 | } | |
5123 | err = bind_rdev_to_array(rdev, mddev); | |
5124 | if (err) | |
5125 | export_rdev(rdev); | |
5126 | return err; | |
5127 | } | |
5128 | ||
5129 | /* | |
5130 | * add_new_disk can be used once the array is assembled | |
5131 | * to add "hot spares". They must already have a superblock | |
5132 | * written | |
5133 | */ | |
5134 | if (mddev->pers) { | |
5135 | int err; | |
5136 | if (!mddev->pers->hot_add_disk) { | |
5137 | printk(KERN_WARNING | |
5138 | "%s: personality does not support diskops!\n", | |
5139 | mdname(mddev)); | |
5140 | return -EINVAL; | |
5141 | } | |
7b1e35f6 N |
5142 | if (mddev->persistent) |
5143 | rdev = md_import_device(dev, mddev->major_version, | |
5144 | mddev->minor_version); | |
5145 | else | |
5146 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5147 | if (IS_ERR(rdev)) { |
5148 | printk(KERN_WARNING | |
5149 | "md: md_import_device returned %ld\n", | |
5150 | PTR_ERR(rdev)); | |
5151 | return PTR_ERR(rdev); | |
5152 | } | |
41158c7e N |
5153 | /* set save_raid_disk if appropriate */ |
5154 | if (!mddev->persistent) { | |
5155 | if (info->state & (1<<MD_DISK_SYNC) && | |
5156 | info->raid_disk < mddev->raid_disks) | |
5157 | rdev->raid_disk = info->raid_disk; | |
5158 | else | |
5159 | rdev->raid_disk = -1; | |
5160 | } else | |
5161 | super_types[mddev->major_version]. | |
5162 | validate_super(mddev, rdev); | |
5163 | rdev->saved_raid_disk = rdev->raid_disk; | |
5164 | ||
b2d444d7 | 5165 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5166 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5167 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5168 | else |
5169 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5170 | |
1da177e4 LT |
5171 | rdev->raid_disk = -1; |
5172 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5173 | if (!err && !mddev->pers->hot_remove_disk) { |
5174 | /* If there is hot_add_disk but no hot_remove_disk | |
5175 | * then added disks for geometry changes, | |
5176 | * and should be added immediately. | |
5177 | */ | |
5178 | super_types[mddev->major_version]. | |
5179 | validate_super(mddev, rdev); | |
5180 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5181 | if (err) | |
5182 | unbind_rdev_from_array(rdev); | |
5183 | } | |
1da177e4 LT |
5184 | if (err) |
5185 | export_rdev(rdev); | |
52664732 | 5186 | else |
00bcb4ac | 5187 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5188 | |
17571284 | 5189 | md_update_sb(mddev, 1); |
72a23c21 NB |
5190 | if (mddev->degraded) |
5191 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5192 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 5193 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5194 | return err; |
5195 | } | |
5196 | ||
5197 | /* otherwise, add_new_disk is only allowed | |
5198 | * for major_version==0 superblocks | |
5199 | */ | |
5200 | if (mddev->major_version != 0) { | |
5201 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5202 | mdname(mddev)); | |
5203 | return -EINVAL; | |
5204 | } | |
5205 | ||
5206 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5207 | int err; | |
d710e138 | 5208 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5209 | if (IS_ERR(rdev)) { |
5210 | printk(KERN_WARNING | |
5211 | "md: error, md_import_device() returned %ld\n", | |
5212 | PTR_ERR(rdev)); | |
5213 | return PTR_ERR(rdev); | |
5214 | } | |
5215 | rdev->desc_nr = info->number; | |
5216 | if (info->raid_disk < mddev->raid_disks) | |
5217 | rdev->raid_disk = info->raid_disk; | |
5218 | else | |
5219 | rdev->raid_disk = -1; | |
5220 | ||
1da177e4 | 5221 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5222 | if (info->state & (1<<MD_DISK_SYNC)) |
5223 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5224 | |
8ddf9efe N |
5225 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5226 | set_bit(WriteMostly, &rdev->flags); | |
5227 | ||
1da177e4 LT |
5228 | if (!mddev->persistent) { |
5229 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 5230 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5231 | } else |
0f420358 | 5232 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
8190e754 | 5233 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5234 | |
2bf071bf N |
5235 | err = bind_rdev_to_array(rdev, mddev); |
5236 | if (err) { | |
5237 | export_rdev(rdev); | |
5238 | return err; | |
5239 | } | |
1da177e4 LT |
5240 | } |
5241 | ||
5242 | return 0; | |
5243 | } | |
5244 | ||
5245 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5246 | { | |
5247 | char b[BDEVNAME_SIZE]; | |
5248 | mdk_rdev_t *rdev; | |
5249 | ||
1da177e4 LT |
5250 | rdev = find_rdev(mddev, dev); |
5251 | if (!rdev) | |
5252 | return -ENXIO; | |
5253 | ||
5254 | if (rdev->raid_disk >= 0) | |
5255 | goto busy; | |
5256 | ||
5257 | kick_rdev_from_array(rdev); | |
850b2b42 | 5258 | md_update_sb(mddev, 1); |
d7603b7e | 5259 | md_new_event(mddev); |
1da177e4 LT |
5260 | |
5261 | return 0; | |
5262 | busy: | |
fdefa4d8 | 5263 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5264 | bdevname(rdev->bdev,b), mdname(mddev)); |
5265 | return -EBUSY; | |
5266 | } | |
5267 | ||
5268 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5269 | { | |
5270 | char b[BDEVNAME_SIZE]; | |
5271 | int err; | |
1da177e4 LT |
5272 | mdk_rdev_t *rdev; |
5273 | ||
5274 | if (!mddev->pers) | |
5275 | return -ENODEV; | |
5276 | ||
5277 | if (mddev->major_version != 0) { | |
5278 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5279 | " version-0 superblocks.\n", | |
5280 | mdname(mddev)); | |
5281 | return -EINVAL; | |
5282 | } | |
5283 | if (!mddev->pers->hot_add_disk) { | |
5284 | printk(KERN_WARNING | |
5285 | "%s: personality does not support diskops!\n", | |
5286 | mdname(mddev)); | |
5287 | return -EINVAL; | |
5288 | } | |
5289 | ||
d710e138 | 5290 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5291 | if (IS_ERR(rdev)) { |
5292 | printk(KERN_WARNING | |
5293 | "md: error, md_import_device() returned %ld\n", | |
5294 | PTR_ERR(rdev)); | |
5295 | return -EINVAL; | |
5296 | } | |
5297 | ||
5298 | if (mddev->persistent) | |
0f420358 | 5299 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 5300 | else |
0f420358 | 5301 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5302 | |
8190e754 | 5303 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5304 | |
b2d444d7 | 5305 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5306 | printk(KERN_WARNING |
5307 | "md: can not hot-add faulty %s disk to %s!\n", | |
5308 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5309 | err = -EINVAL; | |
5310 | goto abort_export; | |
5311 | } | |
b2d444d7 | 5312 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5313 | rdev->desc_nr = -1; |
5842730d | 5314 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5315 | err = bind_rdev_to_array(rdev, mddev); |
5316 | if (err) | |
5317 | goto abort_export; | |
1da177e4 LT |
5318 | |
5319 | /* | |
5320 | * The rest should better be atomic, we can have disk failures | |
5321 | * noticed in interrupt contexts ... | |
5322 | */ | |
5323 | ||
1da177e4 LT |
5324 | rdev->raid_disk = -1; |
5325 | ||
850b2b42 | 5326 | md_update_sb(mddev, 1); |
1da177e4 LT |
5327 | |
5328 | /* | |
5329 | * Kick recovery, maybe this spare has to be added to the | |
5330 | * array immediately. | |
5331 | */ | |
5332 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5333 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5334 | md_new_event(mddev); |
1da177e4 LT |
5335 | return 0; |
5336 | ||
1da177e4 LT |
5337 | abort_export: |
5338 | export_rdev(rdev); | |
5339 | return err; | |
5340 | } | |
5341 | ||
32a7627c N |
5342 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5343 | { | |
5344 | int err; | |
5345 | ||
36fa3063 N |
5346 | if (mddev->pers) { |
5347 | if (!mddev->pers->quiesce) | |
5348 | return -EBUSY; | |
5349 | if (mddev->recovery || mddev->sync_thread) | |
5350 | return -EBUSY; | |
5351 | /* we should be able to change the bitmap.. */ | |
5352 | } | |
32a7627c | 5353 | |
32a7627c | 5354 | |
36fa3063 N |
5355 | if (fd >= 0) { |
5356 | if (mddev->bitmap) | |
5357 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5358 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5359 | |
c3d9714e | 5360 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5361 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5362 | mdname(mddev)); | |
5363 | return -EBADF; | |
5364 | } | |
5365 | ||
c3d9714e | 5366 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5367 | if (err) { |
5368 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5369 | mdname(mddev)); | |
c3d9714e N |
5370 | fput(mddev->bitmap_info.file); |
5371 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5372 | return err; |
5373 | } | |
c3d9714e | 5374 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5375 | } else if (mddev->bitmap == NULL) |
5376 | return -ENOENT; /* cannot remove what isn't there */ | |
5377 | err = 0; | |
5378 | if (mddev->pers) { | |
5379 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5380 | if (fd >= 0) { |
36fa3063 | 5381 | err = bitmap_create(mddev); |
69e51b44 N |
5382 | if (!err) |
5383 | err = bitmap_load(mddev); | |
5384 | } | |
d7375ab3 | 5385 | if (fd < 0 || err) { |
36fa3063 | 5386 | bitmap_destroy(mddev); |
d7375ab3 N |
5387 | fd = -1; /* make sure to put the file */ |
5388 | } | |
36fa3063 | 5389 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5390 | } |
5391 | if (fd < 0) { | |
c3d9714e N |
5392 | if (mddev->bitmap_info.file) { |
5393 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5394 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5395 | } |
c3d9714e | 5396 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5397 | } |
5398 | ||
32a7627c N |
5399 | return err; |
5400 | } | |
5401 | ||
1da177e4 LT |
5402 | /* |
5403 | * set_array_info is used two different ways | |
5404 | * The original usage is when creating a new array. | |
5405 | * In this usage, raid_disks is > 0 and it together with | |
5406 | * level, size, not_persistent,layout,chunksize determine the | |
5407 | * shape of the array. | |
5408 | * This will always create an array with a type-0.90.0 superblock. | |
5409 | * The newer usage is when assembling an array. | |
5410 | * In this case raid_disks will be 0, and the major_version field is | |
5411 | * use to determine which style super-blocks are to be found on the devices. | |
5412 | * The minor and patch _version numbers are also kept incase the | |
5413 | * super_block handler wishes to interpret them. | |
5414 | */ | |
5415 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5416 | { | |
5417 | ||
5418 | if (info->raid_disks == 0) { | |
5419 | /* just setting version number for superblock loading */ | |
5420 | if (info->major_version < 0 || | |
50511da3 | 5421 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5422 | super_types[info->major_version].name == NULL) { |
5423 | /* maybe try to auto-load a module? */ | |
5424 | printk(KERN_INFO | |
5425 | "md: superblock version %d not known\n", | |
5426 | info->major_version); | |
5427 | return -EINVAL; | |
5428 | } | |
5429 | mddev->major_version = info->major_version; | |
5430 | mddev->minor_version = info->minor_version; | |
5431 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5432 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5433 | /* ensure mddev_put doesn't delete this now that there |
5434 | * is some minimal configuration. | |
5435 | */ | |
5436 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5437 | return 0; |
5438 | } | |
5439 | mddev->major_version = MD_MAJOR_VERSION; | |
5440 | mddev->minor_version = MD_MINOR_VERSION; | |
5441 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5442 | mddev->ctime = get_seconds(); | |
5443 | ||
5444 | mddev->level = info->level; | |
17115e03 | 5445 | mddev->clevel[0] = 0; |
58c0fed4 | 5446 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5447 | mddev->raid_disks = info->raid_disks; |
5448 | /* don't set md_minor, it is determined by which /dev/md* was | |
5449 | * openned | |
5450 | */ | |
5451 | if (info->state & (1<<MD_SB_CLEAN)) | |
5452 | mddev->recovery_cp = MaxSector; | |
5453 | else | |
5454 | mddev->recovery_cp = 0; | |
5455 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5456 | mddev->external = 0; |
1da177e4 LT |
5457 | |
5458 | mddev->layout = info->layout; | |
9d8f0363 | 5459 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5460 | |
5461 | mddev->max_disks = MD_SB_DISKS; | |
5462 | ||
e691063a N |
5463 | if (mddev->persistent) |
5464 | mddev->flags = 0; | |
850b2b42 | 5465 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5466 | |
c3d9714e N |
5467 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5468 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5469 | |
f6705578 N |
5470 | mddev->reshape_position = MaxSector; |
5471 | ||
1da177e4 LT |
5472 | /* |
5473 | * Generate a 128 bit UUID | |
5474 | */ | |
5475 | get_random_bytes(mddev->uuid, 16); | |
5476 | ||
f6705578 | 5477 | mddev->new_level = mddev->level; |
664e7c41 | 5478 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5479 | mddev->new_layout = mddev->layout; |
5480 | mddev->delta_disks = 0; | |
5481 | ||
1da177e4 LT |
5482 | return 0; |
5483 | } | |
5484 | ||
1f403624 DW |
5485 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5486 | { | |
b522adcd DW |
5487 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5488 | ||
5489 | if (mddev->external_size) | |
5490 | return; | |
5491 | ||
1f403624 DW |
5492 | mddev->array_sectors = array_sectors; |
5493 | } | |
5494 | EXPORT_SYMBOL(md_set_array_sectors); | |
5495 | ||
d71f9f88 | 5496 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5497 | { |
159ec1fc | 5498 | mdk_rdev_t *rdev; |
a35b0d69 | 5499 | int rv; |
d71f9f88 | 5500 | int fit = (num_sectors == 0); |
a35b0d69 N |
5501 | |
5502 | if (mddev->pers->resize == NULL) | |
5503 | return -EINVAL; | |
d71f9f88 AN |
5504 | /* The "num_sectors" is the number of sectors of each device that |
5505 | * is used. This can only make sense for arrays with redundancy. | |
5506 | * linear and raid0 always use whatever space is available. We can only | |
5507 | * consider changing this number if no resync or reconstruction is | |
5508 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5509 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5510 | * of each device. If num_sectors is zero, we find the largest size |
5511 | * that fits. | |
5512 | ||
a35b0d69 N |
5513 | */ |
5514 | if (mddev->sync_thread) | |
5515 | return -EBUSY; | |
dba034ee N |
5516 | if (mddev->bitmap) |
5517 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5518 | * grow, and re-add. | |
5519 | */ | |
5520 | return -EBUSY; | |
159ec1fc | 5521 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5522 | sector_t avail = rdev->sectors; |
01ab5662 | 5523 | |
d71f9f88 AN |
5524 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5525 | num_sectors = avail; | |
5526 | if (avail < num_sectors) | |
a35b0d69 N |
5527 | return -ENOSPC; |
5528 | } | |
d71f9f88 | 5529 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5530 | if (!rv) |
5531 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5532 | return rv; |
5533 | } | |
5534 | ||
da943b99 N |
5535 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5536 | { | |
5537 | int rv; | |
5538 | /* change the number of raid disks */ | |
63c70c4f | 5539 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5540 | return -EINVAL; |
5541 | if (raid_disks <= 0 || | |
233fca36 | 5542 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5543 | return -EINVAL; |
63c70c4f | 5544 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5545 | return -EBUSY; |
63c70c4f N |
5546 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5547 | ||
5548 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5549 | return rv; |
5550 | } | |
5551 | ||
5552 | ||
1da177e4 LT |
5553 | /* |
5554 | * update_array_info is used to change the configuration of an | |
5555 | * on-line array. | |
5556 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5557 | * fields in the info are checked against the array. | |
5558 | * Any differences that cannot be handled will cause an error. | |
5559 | * Normally, only one change can be managed at a time. | |
5560 | */ | |
5561 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5562 | { | |
5563 | int rv = 0; | |
5564 | int cnt = 0; | |
36fa3063 N |
5565 | int state = 0; |
5566 | ||
5567 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5568 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5569 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5570 | |
5571 | if (mddev->major_version != info->major_version || | |
5572 | mddev->minor_version != info->minor_version || | |
5573 | /* mddev->patch_version != info->patch_version || */ | |
5574 | mddev->ctime != info->ctime || | |
5575 | mddev->level != info->level || | |
5576 | /* mddev->layout != info->layout || */ | |
5577 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5578 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5579 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5580 | ((state^info->state) & 0xfffffe00) | |
5581 | ) | |
1da177e4 LT |
5582 | return -EINVAL; |
5583 | /* Check there is only one change */ | |
58c0fed4 AN |
5584 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5585 | cnt++; | |
5586 | if (mddev->raid_disks != info->raid_disks) | |
5587 | cnt++; | |
5588 | if (mddev->layout != info->layout) | |
5589 | cnt++; | |
5590 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5591 | cnt++; | |
5592 | if (cnt == 0) | |
5593 | return 0; | |
5594 | if (cnt > 1) | |
5595 | return -EINVAL; | |
1da177e4 LT |
5596 | |
5597 | if (mddev->layout != info->layout) { | |
5598 | /* Change layout | |
5599 | * we don't need to do anything at the md level, the | |
5600 | * personality will take care of it all. | |
5601 | */ | |
50ac168a | 5602 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5603 | return -EINVAL; |
597a711b N |
5604 | else { |
5605 | mddev->new_layout = info->layout; | |
50ac168a | 5606 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5607 | if (rv) |
5608 | mddev->new_layout = mddev->layout; | |
5609 | return rv; | |
5610 | } | |
1da177e4 | 5611 | } |
58c0fed4 | 5612 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5613 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5614 | |
da943b99 N |
5615 | if (mddev->raid_disks != info->raid_disks) |
5616 | rv = update_raid_disks(mddev, info->raid_disks); | |
5617 | ||
36fa3063 N |
5618 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5619 | if (mddev->pers->quiesce == NULL) | |
5620 | return -EINVAL; | |
5621 | if (mddev->recovery || mddev->sync_thread) | |
5622 | return -EBUSY; | |
5623 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5624 | /* add the bitmap */ | |
5625 | if (mddev->bitmap) | |
5626 | return -EEXIST; | |
c3d9714e | 5627 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5628 | return -EINVAL; |
c3d9714e N |
5629 | mddev->bitmap_info.offset = |
5630 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5631 | mddev->pers->quiesce(mddev, 1); |
5632 | rv = bitmap_create(mddev); | |
69e51b44 N |
5633 | if (!rv) |
5634 | rv = bitmap_load(mddev); | |
36fa3063 N |
5635 | if (rv) |
5636 | bitmap_destroy(mddev); | |
5637 | mddev->pers->quiesce(mddev, 0); | |
5638 | } else { | |
5639 | /* remove the bitmap */ | |
5640 | if (!mddev->bitmap) | |
5641 | return -ENOENT; | |
5642 | if (mddev->bitmap->file) | |
5643 | return -EINVAL; | |
5644 | mddev->pers->quiesce(mddev, 1); | |
5645 | bitmap_destroy(mddev); | |
5646 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5647 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5648 | } |
5649 | } | |
850b2b42 | 5650 | md_update_sb(mddev, 1); |
1da177e4 LT |
5651 | return rv; |
5652 | } | |
5653 | ||
5654 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5655 | { | |
5656 | mdk_rdev_t *rdev; | |
5657 | ||
5658 | if (mddev->pers == NULL) | |
5659 | return -ENODEV; | |
5660 | ||
5661 | rdev = find_rdev(mddev, dev); | |
5662 | if (!rdev) | |
5663 | return -ENODEV; | |
5664 | ||
5665 | md_error(mddev, rdev); | |
5666 | return 0; | |
5667 | } | |
5668 | ||
2f9618ce AN |
5669 | /* |
5670 | * We have a problem here : there is no easy way to give a CHS | |
5671 | * virtual geometry. We currently pretend that we have a 2 heads | |
5672 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5673 | * dosfs just mad... ;-) | |
5674 | */ | |
a885c8c4 CH |
5675 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5676 | { | |
5677 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5678 | ||
5679 | geo->heads = 2; | |
5680 | geo->sectors = 4; | |
49ce6cea | 5681 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5682 | return 0; |
5683 | } | |
5684 | ||
a39907fa | 5685 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5686 | unsigned int cmd, unsigned long arg) |
5687 | { | |
5688 | int err = 0; | |
5689 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5690 | mddev_t *mddev = NULL; |
e2218350 | 5691 | int ro; |
1da177e4 LT |
5692 | |
5693 | if (!capable(CAP_SYS_ADMIN)) | |
5694 | return -EACCES; | |
5695 | ||
5696 | /* | |
5697 | * Commands dealing with the RAID driver but not any | |
5698 | * particular array: | |
5699 | */ | |
5700 | switch (cmd) | |
5701 | { | |
5702 | case RAID_VERSION: | |
5703 | err = get_version(argp); | |
5704 | goto done; | |
5705 | ||
5706 | case PRINT_RAID_DEBUG: | |
5707 | err = 0; | |
5708 | md_print_devices(); | |
5709 | goto done; | |
5710 | ||
5711 | #ifndef MODULE | |
5712 | case RAID_AUTORUN: | |
5713 | err = 0; | |
5714 | autostart_arrays(arg); | |
5715 | goto done; | |
5716 | #endif | |
5717 | default:; | |
5718 | } | |
5719 | ||
5720 | /* | |
5721 | * Commands creating/starting a new array: | |
5722 | */ | |
5723 | ||
a39907fa | 5724 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5725 | |
5726 | if (!mddev) { | |
5727 | BUG(); | |
5728 | goto abort; | |
5729 | } | |
5730 | ||
1da177e4 LT |
5731 | err = mddev_lock(mddev); |
5732 | if (err) { | |
5733 | printk(KERN_INFO | |
5734 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5735 | err, cmd); | |
5736 | goto abort; | |
5737 | } | |
5738 | ||
5739 | switch (cmd) | |
5740 | { | |
5741 | case SET_ARRAY_INFO: | |
5742 | { | |
5743 | mdu_array_info_t info; | |
5744 | if (!arg) | |
5745 | memset(&info, 0, sizeof(info)); | |
5746 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5747 | err = -EFAULT; | |
5748 | goto abort_unlock; | |
5749 | } | |
5750 | if (mddev->pers) { | |
5751 | err = update_array_info(mddev, &info); | |
5752 | if (err) { | |
5753 | printk(KERN_WARNING "md: couldn't update" | |
5754 | " array info. %d\n", err); | |
5755 | goto abort_unlock; | |
5756 | } | |
5757 | goto done_unlock; | |
5758 | } | |
5759 | if (!list_empty(&mddev->disks)) { | |
5760 | printk(KERN_WARNING | |
5761 | "md: array %s already has disks!\n", | |
5762 | mdname(mddev)); | |
5763 | err = -EBUSY; | |
5764 | goto abort_unlock; | |
5765 | } | |
5766 | if (mddev->raid_disks) { | |
5767 | printk(KERN_WARNING | |
5768 | "md: array %s already initialised!\n", | |
5769 | mdname(mddev)); | |
5770 | err = -EBUSY; | |
5771 | goto abort_unlock; | |
5772 | } | |
5773 | err = set_array_info(mddev, &info); | |
5774 | if (err) { | |
5775 | printk(KERN_WARNING "md: couldn't set" | |
5776 | " array info. %d\n", err); | |
5777 | goto abort_unlock; | |
5778 | } | |
5779 | } | |
5780 | goto done_unlock; | |
5781 | ||
5782 | default:; | |
5783 | } | |
5784 | ||
5785 | /* | |
5786 | * Commands querying/configuring an existing array: | |
5787 | */ | |
32a7627c | 5788 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5789 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5790 | if ((!mddev->raid_disks && !mddev->external) |
5791 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5792 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5793 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5794 | err = -ENODEV; |
5795 | goto abort_unlock; | |
5796 | } | |
5797 | ||
5798 | /* | |
5799 | * Commands even a read-only array can execute: | |
5800 | */ | |
5801 | switch (cmd) | |
5802 | { | |
5803 | case GET_ARRAY_INFO: | |
5804 | err = get_array_info(mddev, argp); | |
5805 | goto done_unlock; | |
5806 | ||
32a7627c | 5807 | case GET_BITMAP_FILE: |
87162a28 | 5808 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5809 | goto done_unlock; |
5810 | ||
1da177e4 LT |
5811 | case GET_DISK_INFO: |
5812 | err = get_disk_info(mddev, argp); | |
5813 | goto done_unlock; | |
5814 | ||
5815 | case RESTART_ARRAY_RW: | |
5816 | err = restart_array(mddev); | |
5817 | goto done_unlock; | |
5818 | ||
5819 | case STOP_ARRAY: | |
d710e138 | 5820 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5821 | goto done_unlock; |
5822 | ||
5823 | case STOP_ARRAY_RO: | |
a4bd82d0 | 5824 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
5825 | goto done_unlock; |
5826 | ||
e2218350 DW |
5827 | case BLKROSET: |
5828 | if (get_user(ro, (int __user *)(arg))) { | |
5829 | err = -EFAULT; | |
5830 | goto done_unlock; | |
5831 | } | |
5832 | err = -EINVAL; | |
5833 | ||
5834 | /* if the bdev is going readonly the value of mddev->ro | |
5835 | * does not matter, no writes are coming | |
5836 | */ | |
5837 | if (ro) | |
5838 | goto done_unlock; | |
5839 | ||
5840 | /* are we are already prepared for writes? */ | |
5841 | if (mddev->ro != 1) | |
5842 | goto done_unlock; | |
5843 | ||
5844 | /* transitioning to readauto need only happen for | |
5845 | * arrays that call md_write_start | |
5846 | */ | |
5847 | if (mddev->pers) { | |
5848 | err = restart_array(mddev); | |
5849 | if (err == 0) { | |
5850 | mddev->ro = 2; | |
5851 | set_disk_ro(mddev->gendisk, 0); | |
5852 | } | |
5853 | } | |
5854 | goto done_unlock; | |
1da177e4 LT |
5855 | } |
5856 | ||
5857 | /* | |
5858 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5859 | * superblock, so we do not allow them on read-only arrays. |
5860 | * However non-MD ioctls (e.g. get-size) will still come through | |
5861 | * here and hit the 'default' below, so only disallow | |
5862 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5863 | */ |
bb57fc64 | 5864 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5865 | if (mddev->ro == 2) { |
5866 | mddev->ro = 0; | |
00bcb4ac | 5867 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
5868 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5869 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5870 | } else { |
5871 | err = -EROFS; | |
5872 | goto abort_unlock; | |
5873 | } | |
1da177e4 LT |
5874 | } |
5875 | ||
5876 | switch (cmd) | |
5877 | { | |
5878 | case ADD_NEW_DISK: | |
5879 | { | |
5880 | mdu_disk_info_t info; | |
5881 | if (copy_from_user(&info, argp, sizeof(info))) | |
5882 | err = -EFAULT; | |
5883 | else | |
5884 | err = add_new_disk(mddev, &info); | |
5885 | goto done_unlock; | |
5886 | } | |
5887 | ||
5888 | case HOT_REMOVE_DISK: | |
5889 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5890 | goto done_unlock; | |
5891 | ||
5892 | case HOT_ADD_DISK: | |
5893 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5894 | goto done_unlock; | |
5895 | ||
5896 | case SET_DISK_FAULTY: | |
5897 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5898 | goto done_unlock; | |
5899 | ||
5900 | case RUN_ARRAY: | |
d710e138 | 5901 | err = do_md_run(mddev); |
1da177e4 LT |
5902 | goto done_unlock; |
5903 | ||
32a7627c N |
5904 | case SET_BITMAP_FILE: |
5905 | err = set_bitmap_file(mddev, (int)arg); | |
5906 | goto done_unlock; | |
5907 | ||
1da177e4 | 5908 | default: |
1da177e4 LT |
5909 | err = -EINVAL; |
5910 | goto abort_unlock; | |
5911 | } | |
5912 | ||
5913 | done_unlock: | |
5914 | abort_unlock: | |
d3374825 N |
5915 | if (mddev->hold_active == UNTIL_IOCTL && |
5916 | err != -EINVAL) | |
5917 | mddev->hold_active = 0; | |
1da177e4 LT |
5918 | mddev_unlock(mddev); |
5919 | ||
5920 | return err; | |
5921 | done: | |
5922 | if (err) | |
5923 | MD_BUG(); | |
5924 | abort: | |
5925 | return err; | |
5926 | } | |
aa98aa31 AB |
5927 | #ifdef CONFIG_COMPAT |
5928 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
5929 | unsigned int cmd, unsigned long arg) | |
5930 | { | |
5931 | switch (cmd) { | |
5932 | case HOT_REMOVE_DISK: | |
5933 | case HOT_ADD_DISK: | |
5934 | case SET_DISK_FAULTY: | |
5935 | case SET_BITMAP_FILE: | |
5936 | /* These take in integer arg, do not convert */ | |
5937 | break; | |
5938 | default: | |
5939 | arg = (unsigned long)compat_ptr(arg); | |
5940 | break; | |
5941 | } | |
5942 | ||
5943 | return md_ioctl(bdev, mode, cmd, arg); | |
5944 | } | |
5945 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 5946 | |
a39907fa | 5947 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5948 | { |
5949 | /* | |
5950 | * Succeed if we can lock the mddev, which confirms that | |
5951 | * it isn't being stopped right now. | |
5952 | */ | |
d3374825 | 5953 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5954 | int err; |
5955 | ||
6e9624b8 | 5956 | lock_kernel(); |
d3374825 N |
5957 | if (mddev->gendisk != bdev->bd_disk) { |
5958 | /* we are racing with mddev_put which is discarding this | |
5959 | * bd_disk. | |
5960 | */ | |
5961 | mddev_put(mddev); | |
5962 | /* Wait until bdev->bd_disk is definitely gone */ | |
5963 | flush_scheduled_work(); | |
5964 | /* Then retry the open from the top */ | |
6e9624b8 | 5965 | unlock_kernel(); |
d3374825 N |
5966 | return -ERESTARTSYS; |
5967 | } | |
5968 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5969 | ||
c8c00a69 | 5970 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
5971 | goto out; |
5972 | ||
5973 | err = 0; | |
f2ea68cf | 5974 | atomic_inc(&mddev->openers); |
c8c00a69 | 5975 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 5976 | |
f3b99be1 | 5977 | check_disk_size_change(mddev->gendisk, bdev); |
1da177e4 | 5978 | out: |
6e9624b8 | 5979 | unlock_kernel(); |
1da177e4 LT |
5980 | return err; |
5981 | } | |
5982 | ||
a39907fa | 5983 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5984 | { |
a39907fa | 5985 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5986 | |
52e5f9d1 | 5987 | BUG_ON(!mddev); |
6e9624b8 | 5988 | lock_kernel(); |
f2ea68cf | 5989 | atomic_dec(&mddev->openers); |
1da177e4 | 5990 | mddev_put(mddev); |
6e9624b8 | 5991 | unlock_kernel(); |
1da177e4 LT |
5992 | |
5993 | return 0; | |
5994 | } | |
83d5cde4 | 5995 | static const struct block_device_operations md_fops = |
1da177e4 LT |
5996 | { |
5997 | .owner = THIS_MODULE, | |
a39907fa AV |
5998 | .open = md_open, |
5999 | .release = md_release, | |
b492b852 | 6000 | .ioctl = md_ioctl, |
aa98aa31 AB |
6001 | #ifdef CONFIG_COMPAT |
6002 | .compat_ioctl = md_compat_ioctl, | |
6003 | #endif | |
a885c8c4 | 6004 | .getgeo = md_getgeo, |
1da177e4 LT |
6005 | }; |
6006 | ||
75c96f85 | 6007 | static int md_thread(void * arg) |
1da177e4 LT |
6008 | { |
6009 | mdk_thread_t *thread = arg; | |
6010 | ||
1da177e4 LT |
6011 | /* |
6012 | * md_thread is a 'system-thread', it's priority should be very | |
6013 | * high. We avoid resource deadlocks individually in each | |
6014 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6015 | * the very same RT priority as kswapd, thus we will never get | |
6016 | * into a priority inversion deadlock. | |
6017 | * | |
6018 | * we definitely have to have equal or higher priority than | |
6019 | * bdflush, otherwise bdflush will deadlock if there are too | |
6020 | * many dirty RAID5 blocks. | |
6021 | */ | |
1da177e4 | 6022 | |
6985c43f | 6023 | allow_signal(SIGKILL); |
a6fb0934 | 6024 | while (!kthread_should_stop()) { |
1da177e4 | 6025 | |
93588e22 N |
6026 | /* We need to wait INTERRUPTIBLE so that |
6027 | * we don't add to the load-average. | |
6028 | * That means we need to be sure no signals are | |
6029 | * pending | |
6030 | */ | |
6031 | if (signal_pending(current)) | |
6032 | flush_signals(current); | |
6033 | ||
6034 | wait_event_interruptible_timeout | |
6035 | (thread->wqueue, | |
6036 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6037 | || kthread_should_stop(), | |
6038 | thread->timeout); | |
1da177e4 LT |
6039 | |
6040 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
6041 | ||
787453c2 | 6042 | thread->run(thread->mddev); |
1da177e4 | 6043 | } |
a6fb0934 | 6044 | |
1da177e4 LT |
6045 | return 0; |
6046 | } | |
6047 | ||
6048 | void md_wakeup_thread(mdk_thread_t *thread) | |
6049 | { | |
6050 | if (thread) { | |
6051 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
6052 | set_bit(THREAD_WAKEUP, &thread->flags); | |
6053 | wake_up(&thread->wqueue); | |
6054 | } | |
6055 | } | |
6056 | ||
6057 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
6058 | const char *name) | |
6059 | { | |
6060 | mdk_thread_t *thread; | |
1da177e4 | 6061 | |
9ffae0cf | 6062 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
6063 | if (!thread) |
6064 | return NULL; | |
6065 | ||
1da177e4 LT |
6066 | init_waitqueue_head(&thread->wqueue); |
6067 | ||
1da177e4 LT |
6068 | thread->run = run; |
6069 | thread->mddev = mddev; | |
32a7627c | 6070 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6071 | thread->tsk = kthread_run(md_thread, thread, |
6072 | "%s_%s", | |
6073 | mdname(thread->mddev), | |
6074 | name ?: mddev->pers->name); | |
a6fb0934 | 6075 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6076 | kfree(thread); |
6077 | return NULL; | |
6078 | } | |
1da177e4 LT |
6079 | return thread; |
6080 | } | |
6081 | ||
1da177e4 LT |
6082 | void md_unregister_thread(mdk_thread_t *thread) |
6083 | { | |
e0cf8f04 N |
6084 | if (!thread) |
6085 | return; | |
ba25f9dc | 6086 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6087 | |
6088 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6089 | kfree(thread); |
6090 | } | |
6091 | ||
6092 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6093 | { | |
6094 | if (!mddev) { | |
6095 | MD_BUG(); | |
6096 | return; | |
6097 | } | |
6098 | ||
b2d444d7 | 6099 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6100 | return; |
6bfe0b49 DW |
6101 | |
6102 | if (mddev->external) | |
6103 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6104 | /* |
1da177e4 LT |
6105 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6106 | mdname(mddev), | |
6107 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6108 | __builtin_return_address(0),__builtin_return_address(1), | |
6109 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6110 | */ |
d0a0a5ee AM |
6111 | if (!mddev->pers) |
6112 | return; | |
1da177e4 LT |
6113 | if (!mddev->pers->error_handler) |
6114 | return; | |
6115 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6116 | if (mddev->degraded) |
6117 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6118 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6119 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6120 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6121 | md_wakeup_thread(mddev->thread); | |
768a418d N |
6122 | if (mddev->event_work.func) |
6123 | schedule_work(&mddev->event_work); | |
c331eb04 | 6124 | md_new_event_inintr(mddev); |
1da177e4 LT |
6125 | } |
6126 | ||
6127 | /* seq_file implementation /proc/mdstat */ | |
6128 | ||
6129 | static void status_unused(struct seq_file *seq) | |
6130 | { | |
6131 | int i = 0; | |
6132 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6133 | |
6134 | seq_printf(seq, "unused devices: "); | |
6135 | ||
159ec1fc | 6136 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6137 | char b[BDEVNAME_SIZE]; |
6138 | i++; | |
6139 | seq_printf(seq, "%s ", | |
6140 | bdevname(rdev->bdev,b)); | |
6141 | } | |
6142 | if (!i) | |
6143 | seq_printf(seq, "<none>"); | |
6144 | ||
6145 | seq_printf(seq, "\n"); | |
6146 | } | |
6147 | ||
6148 | ||
6149 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6150 | { | |
dd71cf6b N |
6151 | sector_t max_sectors, resync, res; |
6152 | unsigned long dt, db; | |
6153 | sector_t rt; | |
4588b42e N |
6154 | int scale; |
6155 | unsigned int per_milli; | |
1da177e4 | 6156 | |
dd71cf6b | 6157 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6158 | |
6159 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6160 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6161 | else |
dd71cf6b | 6162 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6163 | |
6164 | /* | |
6165 | * Should not happen. | |
6166 | */ | |
dd71cf6b | 6167 | if (!max_sectors) { |
1da177e4 LT |
6168 | MD_BUG(); |
6169 | return; | |
6170 | } | |
4588b42e | 6171 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6172 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6173 | * u32, as those are the requirements for sector_div. |
6174 | * Thus 'scale' must be at least 10 | |
6175 | */ | |
6176 | scale = 10; | |
6177 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6178 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6179 | scale++; |
6180 | } | |
6181 | res = (resync>>scale)*1000; | |
dd71cf6b | 6182 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6183 | |
6184 | per_milli = res; | |
1da177e4 | 6185 | { |
4588b42e | 6186 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6187 | seq_printf(seq, "["); |
6188 | for (i = 0; i < x; i++) | |
6189 | seq_printf(seq, "="); | |
6190 | seq_printf(seq, ">"); | |
6191 | for (i = 0; i < y; i++) | |
6192 | seq_printf(seq, "."); | |
6193 | seq_printf(seq, "] "); | |
6194 | } | |
4588b42e | 6195 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6196 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6197 | "reshape" : | |
61df9d91 N |
6198 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6199 | "check" : | |
6200 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6201 | "resync" : "recovery"))), | |
6202 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6203 | (unsigned long long) resync/2, |
6204 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6205 | |
6206 | /* | |
1da177e4 LT |
6207 | * dt: time from mark until now |
6208 | * db: blocks written from mark until now | |
6209 | * rt: remaining time | |
dd71cf6b N |
6210 | * |
6211 | * rt is a sector_t, so could be 32bit or 64bit. | |
6212 | * So we divide before multiply in case it is 32bit and close | |
6213 | * to the limit. | |
6214 | * We scale the divisor (db) by 32 to avoid loosing precision | |
6215 | * near the end of resync when the number of remaining sectors | |
6216 | * is close to 'db'. | |
6217 | * We then divide rt by 32 after multiplying by db to compensate. | |
6218 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6219 | */ |
6220 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6221 | if (!dt) dt++; | |
ff4e8d9a N |
6222 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6223 | - mddev->resync_mark_cnt; | |
1da177e4 | 6224 | |
dd71cf6b N |
6225 | rt = max_sectors - resync; /* number of remaining sectors */ |
6226 | sector_div(rt, db/32+1); | |
6227 | rt *= dt; | |
6228 | rt >>= 5; | |
6229 | ||
6230 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6231 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6232 | |
ff4e8d9a | 6233 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6234 | } |
6235 | ||
6236 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6237 | { | |
6238 | struct list_head *tmp; | |
6239 | loff_t l = *pos; | |
6240 | mddev_t *mddev; | |
6241 | ||
6242 | if (l >= 0x10000) | |
6243 | return NULL; | |
6244 | if (!l--) | |
6245 | /* header */ | |
6246 | return (void*)1; | |
6247 | ||
6248 | spin_lock(&all_mddevs_lock); | |
6249 | list_for_each(tmp,&all_mddevs) | |
6250 | if (!l--) { | |
6251 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6252 | mddev_get(mddev); | |
6253 | spin_unlock(&all_mddevs_lock); | |
6254 | return mddev; | |
6255 | } | |
6256 | spin_unlock(&all_mddevs_lock); | |
6257 | if (!l--) | |
6258 | return (void*)2;/* tail */ | |
6259 | return NULL; | |
6260 | } | |
6261 | ||
6262 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6263 | { | |
6264 | struct list_head *tmp; | |
6265 | mddev_t *next_mddev, *mddev = v; | |
6266 | ||
6267 | ++*pos; | |
6268 | if (v == (void*)2) | |
6269 | return NULL; | |
6270 | ||
6271 | spin_lock(&all_mddevs_lock); | |
6272 | if (v == (void*)1) | |
6273 | tmp = all_mddevs.next; | |
6274 | else | |
6275 | tmp = mddev->all_mddevs.next; | |
6276 | if (tmp != &all_mddevs) | |
6277 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6278 | else { | |
6279 | next_mddev = (void*)2; | |
6280 | *pos = 0x10000; | |
6281 | } | |
6282 | spin_unlock(&all_mddevs_lock); | |
6283 | ||
6284 | if (v != (void*)1) | |
6285 | mddev_put(mddev); | |
6286 | return next_mddev; | |
6287 | ||
6288 | } | |
6289 | ||
6290 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6291 | { | |
6292 | mddev_t *mddev = v; | |
6293 | ||
6294 | if (mddev && v != (void*)1 && v != (void*)2) | |
6295 | mddev_put(mddev); | |
6296 | } | |
6297 | ||
d7603b7e N |
6298 | struct mdstat_info { |
6299 | int event; | |
6300 | }; | |
6301 | ||
1da177e4 LT |
6302 | static int md_seq_show(struct seq_file *seq, void *v) |
6303 | { | |
6304 | mddev_t *mddev = v; | |
dd8ac336 | 6305 | sector_t sectors; |
1da177e4 | 6306 | mdk_rdev_t *rdev; |
d7603b7e | 6307 | struct mdstat_info *mi = seq->private; |
32a7627c | 6308 | struct bitmap *bitmap; |
1da177e4 LT |
6309 | |
6310 | if (v == (void*)1) { | |
2604b703 | 6311 | struct mdk_personality *pers; |
1da177e4 LT |
6312 | seq_printf(seq, "Personalities : "); |
6313 | spin_lock(&pers_lock); | |
2604b703 N |
6314 | list_for_each_entry(pers, &pers_list, list) |
6315 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6316 | |
6317 | spin_unlock(&pers_lock); | |
6318 | seq_printf(seq, "\n"); | |
d7603b7e | 6319 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6320 | return 0; |
6321 | } | |
6322 | if (v == (void*)2) { | |
6323 | status_unused(seq); | |
6324 | return 0; | |
6325 | } | |
6326 | ||
5dc5cf7d | 6327 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6328 | return -EINTR; |
5dc5cf7d | 6329 | |
1da177e4 LT |
6330 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6331 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6332 | mddev->pers ? "" : "in"); | |
6333 | if (mddev->pers) { | |
f91de92e | 6334 | if (mddev->ro==1) |
1da177e4 | 6335 | seq_printf(seq, " (read-only)"); |
f91de92e | 6336 | if (mddev->ro==2) |
52720ae7 | 6337 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6338 | seq_printf(seq, " %s", mddev->pers->name); |
6339 | } | |
6340 | ||
dd8ac336 | 6341 | sectors = 0; |
159ec1fc | 6342 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6343 | char b[BDEVNAME_SIZE]; |
6344 | seq_printf(seq, " %s[%d]", | |
6345 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6346 | if (test_bit(WriteMostly, &rdev->flags)) |
6347 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6348 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6349 | seq_printf(seq, "(F)"); |
6350 | continue; | |
b325a32e N |
6351 | } else if (rdev->raid_disk < 0) |
6352 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6353 | sectors += rdev->sectors; |
1da177e4 LT |
6354 | } |
6355 | ||
6356 | if (!list_empty(&mddev->disks)) { | |
6357 | if (mddev->pers) | |
6358 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6359 | (unsigned long long) |
6360 | mddev->array_sectors / 2); | |
1da177e4 LT |
6361 | else |
6362 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6363 | (unsigned long long)sectors / 2); |
1da177e4 | 6364 | } |
1cd6bf19 N |
6365 | if (mddev->persistent) { |
6366 | if (mddev->major_version != 0 || | |
6367 | mddev->minor_version != 90) { | |
6368 | seq_printf(seq," super %d.%d", | |
6369 | mddev->major_version, | |
6370 | mddev->minor_version); | |
6371 | } | |
e691063a N |
6372 | } else if (mddev->external) |
6373 | seq_printf(seq, " super external:%s", | |
6374 | mddev->metadata_type); | |
6375 | else | |
1cd6bf19 | 6376 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6377 | |
6378 | if (mddev->pers) { | |
d710e138 | 6379 | mddev->pers->status(seq, mddev); |
1da177e4 | 6380 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6381 | if (mddev->pers->sync_request) { |
6382 | if (mddev->curr_resync > 2) { | |
d710e138 | 6383 | status_resync(seq, mddev); |
8e1b39d6 N |
6384 | seq_printf(seq, "\n "); |
6385 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6386 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6387 | else if (mddev->recovery_cp < MaxSector) | |
6388 | seq_printf(seq, "\tresync=PENDING\n "); | |
6389 | } | |
32a7627c N |
6390 | } else |
6391 | seq_printf(seq, "\n "); | |
6392 | ||
6393 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6394 | unsigned long chunk_kb; |
6395 | unsigned long flags; | |
32a7627c | 6396 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6397 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6398 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6399 | "%lu%s chunk", | |
6400 | bitmap->pages - bitmap->missing_pages, | |
6401 | bitmap->pages, | |
6402 | (bitmap->pages - bitmap->missing_pages) | |
6403 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6404 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6405 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6406 | if (bitmap->file) { |
6407 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6408 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6409 | } |
78d742d8 | 6410 | |
32a7627c N |
6411 | seq_printf(seq, "\n"); |
6412 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6413 | } |
6414 | ||
6415 | seq_printf(seq, "\n"); | |
6416 | } | |
6417 | mddev_unlock(mddev); | |
6418 | ||
6419 | return 0; | |
6420 | } | |
6421 | ||
110518bc | 6422 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6423 | .start = md_seq_start, |
6424 | .next = md_seq_next, | |
6425 | .stop = md_seq_stop, | |
6426 | .show = md_seq_show, | |
6427 | }; | |
6428 | ||
6429 | static int md_seq_open(struct inode *inode, struct file *file) | |
6430 | { | |
6431 | int error; | |
d7603b7e N |
6432 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6433 | if (mi == NULL) | |
6434 | return -ENOMEM; | |
1da177e4 LT |
6435 | |
6436 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6437 | if (error) |
6438 | kfree(mi); | |
6439 | else { | |
6440 | struct seq_file *p = file->private_data; | |
6441 | p->private = mi; | |
6442 | mi->event = atomic_read(&md_event_count); | |
6443 | } | |
1da177e4 LT |
6444 | return error; |
6445 | } | |
6446 | ||
d7603b7e N |
6447 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6448 | { | |
6449 | struct seq_file *m = filp->private_data; | |
6450 | struct mdstat_info *mi = m->private; | |
6451 | int mask; | |
6452 | ||
6453 | poll_wait(filp, &md_event_waiters, wait); | |
6454 | ||
6455 | /* always allow read */ | |
6456 | mask = POLLIN | POLLRDNORM; | |
6457 | ||
6458 | if (mi->event != atomic_read(&md_event_count)) | |
6459 | mask |= POLLERR | POLLPRI; | |
6460 | return mask; | |
6461 | } | |
6462 | ||
fa027c2a | 6463 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6464 | .owner = THIS_MODULE, |
1da177e4 LT |
6465 | .open = md_seq_open, |
6466 | .read = seq_read, | |
6467 | .llseek = seq_lseek, | |
c3f94b40 | 6468 | .release = seq_release_private, |
d7603b7e | 6469 | .poll = mdstat_poll, |
1da177e4 LT |
6470 | }; |
6471 | ||
2604b703 | 6472 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6473 | { |
1da177e4 | 6474 | spin_lock(&pers_lock); |
2604b703 N |
6475 | list_add_tail(&p->list, &pers_list); |
6476 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6477 | spin_unlock(&pers_lock); |
6478 | return 0; | |
6479 | } | |
6480 | ||
2604b703 | 6481 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6482 | { |
2604b703 | 6483 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6484 | spin_lock(&pers_lock); |
2604b703 | 6485 | list_del_init(&p->list); |
1da177e4 LT |
6486 | spin_unlock(&pers_lock); |
6487 | return 0; | |
6488 | } | |
6489 | ||
eea1bf38 | 6490 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6491 | { |
6492 | mdk_rdev_t * rdev; | |
1da177e4 | 6493 | int idle; |
eea1bf38 | 6494 | int curr_events; |
1da177e4 LT |
6495 | |
6496 | idle = 1; | |
4b80991c N |
6497 | rcu_read_lock(); |
6498 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6499 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6500 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6501 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6502 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6503 | /* sync IO will cause sync_io to increase before the disk_stats |
6504 | * as sync_io is counted when a request starts, and | |
6505 | * disk_stats is counted when it completes. | |
6506 | * So resync activity will cause curr_events to be smaller than | |
6507 | * when there was no such activity. | |
6508 | * non-sync IO will cause disk_stat to increase without | |
6509 | * increasing sync_io so curr_events will (eventually) | |
6510 | * be larger than it was before. Once it becomes | |
6511 | * substantially larger, the test below will cause | |
6512 | * the array to appear non-idle, and resync will slow | |
6513 | * down. | |
6514 | * If there is a lot of outstanding resync activity when | |
6515 | * we set last_event to curr_events, then all that activity | |
6516 | * completing might cause the array to appear non-idle | |
6517 | * and resync will be slowed down even though there might | |
6518 | * not have been non-resync activity. This will only | |
6519 | * happen once though. 'last_events' will soon reflect | |
6520 | * the state where there is little or no outstanding | |
6521 | * resync requests, and further resync activity will | |
6522 | * always make curr_events less than last_events. | |
c0e48521 | 6523 | * |
1da177e4 | 6524 | */ |
eea1bf38 | 6525 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6526 | rdev->last_events = curr_events; |
6527 | idle = 0; | |
6528 | } | |
6529 | } | |
4b80991c | 6530 | rcu_read_unlock(); |
1da177e4 LT |
6531 | return idle; |
6532 | } | |
6533 | ||
6534 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6535 | { | |
6536 | /* another "blocks" (512byte) blocks have been synced */ | |
6537 | atomic_sub(blocks, &mddev->recovery_active); | |
6538 | wake_up(&mddev->recovery_wait); | |
6539 | if (!ok) { | |
dfc70645 | 6540 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6541 | md_wakeup_thread(mddev->thread); |
6542 | // stop recovery, signal do_sync .... | |
6543 | } | |
6544 | } | |
6545 | ||
6546 | ||
06d91a5f N |
6547 | /* md_write_start(mddev, bi) |
6548 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6549 | * in superblock) before writing, schedule a superblock update |
6550 | * and wait for it to complete. | |
06d91a5f | 6551 | */ |
3d310eb7 | 6552 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6553 | { |
0fd62b86 | 6554 | int did_change = 0; |
06d91a5f | 6555 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6556 | return; |
06d91a5f | 6557 | |
f91de92e N |
6558 | BUG_ON(mddev->ro == 1); |
6559 | if (mddev->ro == 2) { | |
6560 | /* need to switch to read/write */ | |
6561 | mddev->ro = 0; | |
6562 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6563 | md_wakeup_thread(mddev->thread); | |
25156198 | 6564 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6565 | did_change = 1; |
f91de92e | 6566 | } |
06d91a5f | 6567 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6568 | if (mddev->safemode == 1) |
6569 | mddev->safemode = 0; | |
06d91a5f | 6570 | if (mddev->in_sync) { |
a9701a30 | 6571 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6572 | if (mddev->in_sync) { |
6573 | mddev->in_sync = 0; | |
850b2b42 | 6574 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 6575 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6576 | did_change = 1; |
3d310eb7 | 6577 | } |
a9701a30 | 6578 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6579 | } |
0fd62b86 | 6580 | if (did_change) |
00bcb4ac | 6581 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 N |
6582 | wait_event(mddev->sb_wait, |
6583 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
6584 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
6585 | } |
6586 | ||
6587 | void md_write_end(mddev_t *mddev) | |
6588 | { | |
6589 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6590 | if (mddev->safemode == 2) | |
6591 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6592 | else if (mddev->safemode_delay) |
1da177e4 LT |
6593 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6594 | } | |
6595 | } | |
6596 | ||
2a2275d6 N |
6597 | /* md_allow_write(mddev) |
6598 | * Calling this ensures that the array is marked 'active' so that writes | |
6599 | * may proceed without blocking. It is important to call this before | |
6600 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6601 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6602 | * |
6603 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6604 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6605 | */ |
b5470dc5 | 6606 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6607 | { |
6608 | if (!mddev->pers) | |
b5470dc5 | 6609 | return 0; |
2a2275d6 | 6610 | if (mddev->ro) |
b5470dc5 | 6611 | return 0; |
1a0fd497 | 6612 | if (!mddev->pers->sync_request) |
b5470dc5 | 6613 | return 0; |
2a2275d6 N |
6614 | |
6615 | spin_lock_irq(&mddev->write_lock); | |
6616 | if (mddev->in_sync) { | |
6617 | mddev->in_sync = 0; | |
6618 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6619 | if (mddev->safemode_delay && | |
6620 | mddev->safemode == 0) | |
6621 | mddev->safemode = 1; | |
6622 | spin_unlock_irq(&mddev->write_lock); | |
6623 | md_update_sb(mddev, 0); | |
00bcb4ac | 6624 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6625 | } else |
6626 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
6627 | |
6628 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
6629 | return -EAGAIN; | |
6630 | else | |
6631 | return 0; | |
2a2275d6 N |
6632 | } |
6633 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6634 | ||
b63d7c2e | 6635 | void md_unplug(mddev_t *mddev) |
252ac522 N |
6636 | { |
6637 | if (mddev->queue) | |
6638 | blk_unplug(mddev->queue); | |
6639 | if (mddev->plug) | |
6640 | mddev->plug->unplug_fn(mddev->plug); | |
6641 | } | |
6642 | ||
1da177e4 LT |
6643 | #define SYNC_MARKS 10 |
6644 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6645 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6646 | { |
6647 | mddev_t *mddev2; | |
6648 | unsigned int currspeed = 0, | |
6649 | window; | |
57afd89f | 6650 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6651 | unsigned long mark[SYNC_MARKS]; |
6652 | sector_t mark_cnt[SYNC_MARKS]; | |
6653 | int last_mark,m; | |
6654 | struct list_head *tmp; | |
6655 | sector_t last_check; | |
57afd89f | 6656 | int skipped = 0; |
5fd6c1dc | 6657 | mdk_rdev_t *rdev; |
61df9d91 | 6658 | char *desc; |
1da177e4 LT |
6659 | |
6660 | /* just incase thread restarts... */ | |
6661 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6662 | return; | |
5fd6c1dc N |
6663 | if (mddev->ro) /* never try to sync a read-only array */ |
6664 | return; | |
1da177e4 | 6665 | |
61df9d91 N |
6666 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6667 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6668 | desc = "data-check"; | |
6669 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6670 | desc = "requested-resync"; | |
6671 | else | |
6672 | desc = "resync"; | |
6673 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6674 | desc = "reshape"; | |
6675 | else | |
6676 | desc = "recovery"; | |
6677 | ||
1da177e4 LT |
6678 | /* we overload curr_resync somewhat here. |
6679 | * 0 == not engaged in resync at all | |
6680 | * 2 == checking that there is no conflict with another sync | |
6681 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6682 | * commense | |
6683 | * other == active in resync - this many blocks | |
6684 | * | |
6685 | * Before starting a resync we must have set curr_resync to | |
6686 | * 2, and then checked that every "conflicting" array has curr_resync | |
6687 | * less than ours. When we find one that is the same or higher | |
6688 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6689 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6690 | * This will mean we have to start checking from the beginning again. | |
6691 | * | |
6692 | */ | |
6693 | ||
6694 | do { | |
6695 | mddev->curr_resync = 2; | |
6696 | ||
6697 | try_again: | |
404e4b43 | 6698 | if (kthread_should_stop()) |
6985c43f | 6699 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6700 | |
6701 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6702 | goto skip; |
29ac4aa3 | 6703 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6704 | if (mddev2 == mddev) |
6705 | continue; | |
90b08710 BS |
6706 | if (!mddev->parallel_resync |
6707 | && mddev2->curr_resync | |
6708 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6709 | DEFINE_WAIT(wq); |
6710 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6711 | /* arbitrarily yield */ | |
6712 | mddev->curr_resync = 1; | |
6713 | wake_up(&resync_wait); | |
6714 | } | |
6715 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6716 | /* no need to wait here, we can wait the next | |
6717 | * time 'round when curr_resync == 2 | |
6718 | */ | |
6719 | continue; | |
9744197c N |
6720 | /* We need to wait 'interruptible' so as not to |
6721 | * contribute to the load average, and not to | |
6722 | * be caught by 'softlockup' | |
6723 | */ | |
6724 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6725 | if (!kthread_should_stop() && |
8712e553 | 6726 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6727 | printk(KERN_INFO "md: delaying %s of %s" |
6728 | " until %s has finished (they" | |
1da177e4 | 6729 | " share one or more physical units)\n", |
61df9d91 | 6730 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6731 | mddev_put(mddev2); |
9744197c N |
6732 | if (signal_pending(current)) |
6733 | flush_signals(current); | |
1da177e4 LT |
6734 | schedule(); |
6735 | finish_wait(&resync_wait, &wq); | |
6736 | goto try_again; | |
6737 | } | |
6738 | finish_wait(&resync_wait, &wq); | |
6739 | } | |
6740 | } | |
6741 | } while (mddev->curr_resync < 2); | |
6742 | ||
5fd6c1dc | 6743 | j = 0; |
9d88883e | 6744 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6745 | /* resync follows the size requested by the personality, |
57afd89f | 6746 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6747 | */ |
6748 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6749 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6750 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6751 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6752 | j = mddev->resync_min; | |
6753 | else if (!mddev->bitmap) | |
5fd6c1dc | 6754 | j = mddev->recovery_cp; |
5e96ee65 | 6755 | |
ccfcc3c1 | 6756 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6757 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6758 | else { |
1da177e4 | 6759 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6760 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6761 | j = MaxSector; |
4e59ca7d DW |
6762 | rcu_read_lock(); |
6763 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
6764 | if (rdev->raid_disk >= 0 && |
6765 | !test_bit(Faulty, &rdev->flags) && | |
6766 | !test_bit(In_sync, &rdev->flags) && | |
6767 | rdev->recovery_offset < j) | |
6768 | j = rdev->recovery_offset; | |
4e59ca7d | 6769 | rcu_read_unlock(); |
5fd6c1dc | 6770 | } |
1da177e4 | 6771 | |
61df9d91 N |
6772 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6773 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6774 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6775 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6776 | "(but not more than %d KB/sec) for %s.\n", |
6777 | speed_max(mddev), desc); | |
1da177e4 | 6778 | |
eea1bf38 | 6779 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6780 | |
57afd89f | 6781 | io_sectors = 0; |
1da177e4 LT |
6782 | for (m = 0; m < SYNC_MARKS; m++) { |
6783 | mark[m] = jiffies; | |
57afd89f | 6784 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6785 | } |
6786 | last_mark = 0; | |
6787 | mddev->resync_mark = mark[last_mark]; | |
6788 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6789 | ||
6790 | /* | |
6791 | * Tune reconstruction: | |
6792 | */ | |
6793 | window = 32*(PAGE_SIZE/512); | |
6794 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6795 | window/2,(unsigned long long) max_sectors/2); | |
6796 | ||
6797 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6798 | last_check = 0; |
6799 | ||
6800 | if (j>2) { | |
6801 | printk(KERN_INFO | |
61df9d91 N |
6802 | "md: resuming %s of %s from checkpoint.\n", |
6803 | desc, mdname(mddev)); | |
1da177e4 LT |
6804 | mddev->curr_resync = j; |
6805 | } | |
efa59339 | 6806 | mddev->curr_resync_completed = mddev->curr_resync; |
1da177e4 LT |
6807 | |
6808 | while (j < max_sectors) { | |
57afd89f | 6809 | sector_t sectors; |
1da177e4 | 6810 | |
57afd89f | 6811 | skipped = 0; |
97e4f42d | 6812 | |
7a91ee1f N |
6813 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6814 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6815 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6816 | > (max_sectors >> 4)) || | |
6817 | (j - mddev->curr_resync_completed)*2 | |
6818 | >= mddev->resync_max - mddev->curr_resync_completed | |
6819 | )) { | |
97e4f42d | 6820 | /* time to update curr_resync_completed */ |
252ac522 | 6821 | md_unplug(mddev); |
97e4f42d N |
6822 | wait_event(mddev->recovery_wait, |
6823 | atomic_read(&mddev->recovery_active) == 0); | |
6824 | mddev->curr_resync_completed = | |
6825 | mddev->curr_resync; | |
676e42d8 N |
6826 | if (mddev->persistent) |
6827 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
acb180b0 | 6828 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6829 | } |
acb180b0 | 6830 | |
e62e58a5 N |
6831 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6832 | /* As this condition is controlled by user-space, | |
6833 | * we can block indefinitely, so use '_interruptible' | |
6834 | * to avoid triggering warnings. | |
6835 | */ | |
6836 | flush_signals(current); /* just in case */ | |
6837 | wait_event_interruptible(mddev->recovery_wait, | |
6838 | mddev->resync_max > j | |
6839 | || kthread_should_stop()); | |
6840 | } | |
acb180b0 N |
6841 | |
6842 | if (kthread_should_stop()) | |
6843 | goto interrupted; | |
6844 | ||
57afd89f | 6845 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6846 | currspeed < speed_min(mddev)); |
57afd89f | 6847 | if (sectors == 0) { |
dfc70645 | 6848 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6849 | goto out; |
6850 | } | |
57afd89f N |
6851 | |
6852 | if (!skipped) { /* actual IO requested */ | |
6853 | io_sectors += sectors; | |
6854 | atomic_add(sectors, &mddev->recovery_active); | |
6855 | } | |
6856 | ||
1da177e4 LT |
6857 | j += sectors; |
6858 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6859 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6860 | if (last_check == 0) |
6861 | /* this is the earliers that rebuilt will be | |
6862 | * visible in /proc/mdstat | |
6863 | */ | |
6864 | md_new_event(mddev); | |
57afd89f N |
6865 | |
6866 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6867 | continue; |
6868 | ||
57afd89f | 6869 | last_check = io_sectors; |
1da177e4 | 6870 | |
dfc70645 | 6871 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6872 | break; |
6873 | ||
6874 | repeat: | |
6875 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6876 | /* step marks */ | |
6877 | int next = (last_mark+1) % SYNC_MARKS; | |
6878 | ||
6879 | mddev->resync_mark = mark[next]; | |
6880 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6881 | mark[next] = jiffies; | |
57afd89f | 6882 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6883 | last_mark = next; |
6884 | } | |
6885 | ||
6886 | ||
c6207277 N |
6887 | if (kthread_should_stop()) |
6888 | goto interrupted; | |
6889 | ||
1da177e4 LT |
6890 | |
6891 | /* | |
6892 | * this loop exits only if either when we are slower than | |
6893 | * the 'hard' speed limit, or the system was IO-idle for | |
6894 | * a jiffy. | |
6895 | * the system might be non-idle CPU-wise, but we only care | |
6896 | * about not overloading the IO subsystem. (things like an | |
6897 | * e2fsck being done on the RAID array should execute fast) | |
6898 | */ | |
252ac522 | 6899 | md_unplug(mddev); |
1da177e4 LT |
6900 | cond_resched(); |
6901 | ||
57afd89f N |
6902 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6903 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6904 | |
88202a0c N |
6905 | if (currspeed > speed_min(mddev)) { |
6906 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6907 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6908 | msleep(500); |
1da177e4 LT |
6909 | goto repeat; |
6910 | } | |
6911 | } | |
6912 | } | |
61df9d91 | 6913 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6914 | /* |
6915 | * this also signals 'finished resyncing' to md_stop | |
6916 | */ | |
6917 | out: | |
252ac522 | 6918 | md_unplug(mddev); |
1da177e4 LT |
6919 | |
6920 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6921 | ||
6922 | /* tell personality that we are finished */ | |
57afd89f | 6923 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6924 | |
dfc70645 | 6925 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6926 | mddev->curr_resync > 2) { |
6927 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6928 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6929 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6930 | printk(KERN_INFO | |
61df9d91 N |
6931 | "md: checkpointing %s of %s.\n", |
6932 | desc, mdname(mddev)); | |
5fd6c1dc N |
6933 | mddev->recovery_cp = mddev->curr_resync; |
6934 | } | |
6935 | } else | |
6936 | mddev->recovery_cp = MaxSector; | |
6937 | } else { | |
6938 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6939 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
6940 | rcu_read_lock(); |
6941 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 6942 | if (rdev->raid_disk >= 0 && |
70fffd0b | 6943 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
6944 | !test_bit(Faulty, &rdev->flags) && |
6945 | !test_bit(In_sync, &rdev->flags) && | |
6946 | rdev->recovery_offset < mddev->curr_resync) | |
6947 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 6948 | rcu_read_unlock(); |
5fd6c1dc | 6949 | } |
1da177e4 | 6950 | } |
17571284 | 6951 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6952 | |
1da177e4 | 6953 | skip: |
c07b70ad N |
6954 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
6955 | /* We completed so min/max setting can be forgotten if used. */ | |
6956 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6957 | mddev->resync_min = 0; | |
6958 | mddev->resync_max = MaxSector; | |
6959 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6960 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 6961 | mddev->curr_resync = 0; |
efa59339 N |
6962 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
6963 | mddev->curr_resync_completed = 0; | |
c6207277 | 6964 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
1da177e4 LT |
6965 | wake_up(&resync_wait); |
6966 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6967 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6968 | return; |
6969 | ||
6970 | interrupted: | |
6971 | /* | |
6972 | * got a signal, exit. | |
6973 | */ | |
6974 | printk(KERN_INFO | |
6975 | "md: md_do_sync() got signal ... exiting\n"); | |
6976 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6977 | goto out; | |
6978 | ||
1da177e4 | 6979 | } |
29269553 | 6980 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6981 | |
6982 | ||
b4c4c7b8 N |
6983 | static int remove_and_add_spares(mddev_t *mddev) |
6984 | { | |
6985 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6986 | int spares = 0; |
6987 | ||
97e4f42d N |
6988 | mddev->curr_resync_completed = 0; |
6989 | ||
159ec1fc | 6990 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6991 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6992 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6993 | (test_bit(Faulty, &rdev->flags) || |
6994 | ! test_bit(In_sync, &rdev->flags)) && | |
6995 | atomic_read(&rdev->nr_pending)==0) { | |
6996 | if (mddev->pers->hot_remove_disk( | |
6997 | mddev, rdev->raid_disk)==0) { | |
6998 | char nm[20]; | |
6999 | sprintf(nm,"rd%d", rdev->raid_disk); | |
7000 | sysfs_remove_link(&mddev->kobj, nm); | |
7001 | rdev->raid_disk = -1; | |
7002 | } | |
7003 | } | |
7004 | ||
4044ba58 | 7005 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 7006 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7007 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
7008 | !test_bit(In_sync, &rdev->flags) && |
7009 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 7010 | spares++; |
b4c4c7b8 N |
7011 | if (rdev->raid_disk < 0 |
7012 | && !test_bit(Faulty, &rdev->flags)) { | |
7013 | rdev->recovery_offset = 0; | |
199050ea NB |
7014 | if (mddev->pers-> |
7015 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
7016 | char nm[20]; |
7017 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
7018 | if (sysfs_create_link(&mddev->kobj, |
7019 | &rdev->kobj, nm)) | |
00bcb4ac | 7020 | /* failure here is OK */; |
b4c4c7b8 N |
7021 | spares++; |
7022 | md_new_event(mddev); | |
93be75ff | 7023 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
7024 | } else |
7025 | break; | |
7026 | } | |
dfc70645 | 7027 | } |
b4c4c7b8 N |
7028 | } |
7029 | return spares; | |
7030 | } | |
1da177e4 LT |
7031 | /* |
7032 | * This routine is regularly called by all per-raid-array threads to | |
7033 | * deal with generic issues like resync and super-block update. | |
7034 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7035 | * need this as they never do any recovery or update the superblock. | |
7036 | * | |
7037 | * It does not do any resync itself, but rather "forks" off other threads | |
7038 | * to do that as needed. | |
7039 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7040 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7041 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7042 | * and wakeups up this thread which will reap the thread and finish up. |
7043 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7044 | * | |
7045 | * The overall approach is: | |
7046 | * 1/ if the superblock needs updating, update it. | |
7047 | * 2/ If a recovery thread is running, don't do anything else. | |
7048 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7049 | * 4/ If there are any faulty devices, remove them. | |
7050 | * 5/ If array is degraded, try to add spares devices | |
7051 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7052 | */ | |
7053 | void md_check_recovery(mddev_t *mddev) | |
7054 | { | |
7055 | mdk_rdev_t *rdev; | |
1da177e4 LT |
7056 | |
7057 | ||
5f40402d | 7058 | if (mddev->bitmap) |
aa5cbd10 | 7059 | bitmap_daemon_work(mddev); |
1da177e4 LT |
7060 | |
7061 | if (mddev->ro) | |
7062 | return; | |
fca4d848 N |
7063 | |
7064 | if (signal_pending(current)) { | |
31a59e34 | 7065 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7066 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7067 | mdname(mddev)); | |
7068 | mddev->safemode = 2; | |
7069 | } | |
7070 | flush_signals(current); | |
7071 | } | |
7072 | ||
c89a8eee N |
7073 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7074 | return; | |
1da177e4 | 7075 | if ( ! ( |
e691063a | 7076 | (mddev->flags && !mddev->external) || |
1da177e4 | 7077 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7078 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7079 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7080 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7081 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7082 | )) |
7083 | return; | |
fca4d848 | 7084 | |
df5b89b3 | 7085 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7086 | int spares = 0; |
fca4d848 | 7087 | |
c89a8eee N |
7088 | if (mddev->ro) { |
7089 | /* Only thing we do on a ro array is remove | |
7090 | * failed devices. | |
7091 | */ | |
7092 | remove_and_add_spares(mddev); | |
7093 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7094 | goto unlock; | |
7095 | } | |
7096 | ||
31a59e34 | 7097 | if (!mddev->external) { |
0fd62b86 | 7098 | int did_change = 0; |
31a59e34 N |
7099 | spin_lock_irq(&mddev->write_lock); |
7100 | if (mddev->safemode && | |
7101 | !atomic_read(&mddev->writes_pending) && | |
7102 | !mddev->in_sync && | |
7103 | mddev->recovery_cp == MaxSector) { | |
7104 | mddev->in_sync = 1; | |
0fd62b86 | 7105 | did_change = 1; |
31a59e34 N |
7106 | if (mddev->persistent) |
7107 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
7108 | } | |
7109 | if (mddev->safemode == 1) | |
7110 | mddev->safemode = 0; | |
7111 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7112 | if (did_change) |
00bcb4ac | 7113 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7114 | } |
fca4d848 | 7115 | |
850b2b42 N |
7116 | if (mddev->flags) |
7117 | md_update_sb(mddev, 0); | |
06d91a5f | 7118 | |
1da177e4 LT |
7119 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7120 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7121 | /* resync/recovery still happening */ | |
7122 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7123 | goto unlock; | |
7124 | } | |
7125 | if (mddev->sync_thread) { | |
7126 | /* resync has finished, collect result */ | |
7127 | md_unregister_thread(mddev->sync_thread); | |
7128 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
7129 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
7130 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
7131 | /* success...*/ |
7132 | /* activate any spares */ | |
a99ac971 NB |
7133 | if (mddev->pers->spare_active(mddev)) |
7134 | sysfs_notify(&mddev->kobj, NULL, | |
7135 | "degraded"); | |
1da177e4 | 7136 | } |
cea9c228 N |
7137 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7138 | mddev->pers->finish_reshape) | |
7139 | mddev->pers->finish_reshape(mddev); | |
850b2b42 | 7140 | md_update_sb(mddev, 1); |
41158c7e N |
7141 | |
7142 | /* if array is no-longer degraded, then any saved_raid_disk | |
7143 | * information must be scrapped | |
7144 | */ | |
7145 | if (!mddev->degraded) | |
159ec1fc | 7146 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
7147 | rdev->saved_raid_disk = -1; |
7148 | ||
1da177e4 LT |
7149 | mddev->recovery = 0; |
7150 | /* flag recovery needed just to double check */ | |
7151 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
00bcb4ac | 7152 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7153 | md_new_event(mddev); |
1da177e4 LT |
7154 | goto unlock; |
7155 | } | |
72a23c21 NB |
7156 | /* Set RUNNING before clearing NEEDED to avoid |
7157 | * any transients in the value of "sync_action". | |
7158 | */ | |
7159 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7160 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7161 | /* Clear some bits that don't mean anything, but |
7162 | * might be left set | |
7163 | */ | |
24dd469d N |
7164 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7165 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7166 | |
5fd6c1dc N |
7167 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7168 | goto unlock; | |
1da177e4 LT |
7169 | /* no recovery is running. |
7170 | * remove any failed drives, then | |
7171 | * add spares if possible. | |
7172 | * Spare are also removed and re-added, to allow | |
7173 | * the personality to fail the re-add. | |
7174 | */ | |
1da177e4 | 7175 | |
b4c4c7b8 | 7176 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7177 | if (mddev->pers->check_reshape == NULL || |
7178 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7179 | /* Cannot proceed */ |
7180 | goto unlock; | |
7181 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7182 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7183 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7184 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7185 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7186 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7187 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7188 | } else if (mddev->recovery_cp < MaxSector) { |
7189 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7190 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7191 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7192 | /* nothing to be done ... */ | |
1da177e4 | 7193 | goto unlock; |
24dd469d | 7194 | |
1da177e4 | 7195 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7196 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7197 | /* We are adding a device or devices to an array | |
7198 | * which has the bitmap stored on all devices. | |
7199 | * So make sure all bitmap pages get written | |
7200 | */ | |
7201 | bitmap_write_all(mddev->bitmap); | |
7202 | } | |
1da177e4 LT |
7203 | mddev->sync_thread = md_register_thread(md_do_sync, |
7204 | mddev, | |
0da3c619 | 7205 | "resync"); |
1da177e4 LT |
7206 | if (!mddev->sync_thread) { |
7207 | printk(KERN_ERR "%s: could not start resync" | |
7208 | " thread...\n", | |
7209 | mdname(mddev)); | |
7210 | /* leave the spares where they are, it shouldn't hurt */ | |
7211 | mddev->recovery = 0; | |
d7603b7e | 7212 | } else |
1da177e4 | 7213 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7214 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7215 | md_new_event(mddev); |
1da177e4 LT |
7216 | } |
7217 | unlock: | |
72a23c21 NB |
7218 | if (!mddev->sync_thread) { |
7219 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7220 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7221 | &mddev->recovery)) | |
0c3573f1 | 7222 | if (mddev->sysfs_action) |
00bcb4ac | 7223 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7224 | } |
1da177e4 LT |
7225 | mddev_unlock(mddev); |
7226 | } | |
7227 | } | |
7228 | ||
6bfe0b49 DW |
7229 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7230 | { | |
00bcb4ac | 7231 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 DW |
7232 | wait_event_timeout(rdev->blocked_wait, |
7233 | !test_bit(Blocked, &rdev->flags), | |
7234 | msecs_to_jiffies(5000)); | |
7235 | rdev_dec_pending(rdev, mddev); | |
7236 | } | |
7237 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7238 | ||
75c96f85 AB |
7239 | static int md_notify_reboot(struct notifier_block *this, |
7240 | unsigned long code, void *x) | |
1da177e4 LT |
7241 | { |
7242 | struct list_head *tmp; | |
7243 | mddev_t *mddev; | |
7244 | ||
7245 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7246 | ||
7247 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7248 | ||
29ac4aa3 | 7249 | for_each_mddev(mddev, tmp) |
c71d4887 | 7250 | if (mddev_trylock(mddev)) { |
2b25000b N |
7251 | /* Force a switch to readonly even array |
7252 | * appears to still be in use. Hence | |
7253 | * the '100'. | |
7254 | */ | |
a4bd82d0 | 7255 | md_set_readonly(mddev, 100); |
c71d4887 NB |
7256 | mddev_unlock(mddev); |
7257 | } | |
1da177e4 LT |
7258 | /* |
7259 | * certain more exotic SCSI devices are known to be | |
7260 | * volatile wrt too early system reboots. While the | |
7261 | * right place to handle this issue is the given | |
7262 | * driver, we do want to have a safe RAID driver ... | |
7263 | */ | |
7264 | mdelay(1000*1); | |
7265 | } | |
7266 | return NOTIFY_DONE; | |
7267 | } | |
7268 | ||
75c96f85 | 7269 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7270 | .notifier_call = md_notify_reboot, |
7271 | .next = NULL, | |
7272 | .priority = INT_MAX, /* before any real devices */ | |
7273 | }; | |
7274 | ||
7275 | static void md_geninit(void) | |
7276 | { | |
1da177e4 LT |
7277 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7278 | ||
c7705f34 | 7279 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7280 | } |
7281 | ||
75c96f85 | 7282 | static int __init md_init(void) |
1da177e4 | 7283 | { |
3dbd8c2e | 7284 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
7285 | return -1; |
7286 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 7287 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
7288 | return -1; |
7289 | } | |
3dbd8c2e | 7290 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7291 | md_probe, NULL, NULL); |
7292 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7293 | md_probe, NULL, NULL); |
7294 | ||
1da177e4 | 7295 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7296 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7297 | |
7298 | md_geninit(); | |
d710e138 | 7299 | return 0; |
1da177e4 LT |
7300 | } |
7301 | ||
7302 | ||
7303 | #ifndef MODULE | |
7304 | ||
7305 | /* | |
7306 | * Searches all registered partitions for autorun RAID arrays | |
7307 | * at boot time. | |
7308 | */ | |
4d936ec1 ME |
7309 | |
7310 | static LIST_HEAD(all_detected_devices); | |
7311 | struct detected_devices_node { | |
7312 | struct list_head list; | |
7313 | dev_t dev; | |
7314 | }; | |
1da177e4 LT |
7315 | |
7316 | void md_autodetect_dev(dev_t dev) | |
7317 | { | |
4d936ec1 ME |
7318 | struct detected_devices_node *node_detected_dev; |
7319 | ||
7320 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7321 | if (node_detected_dev) { | |
7322 | node_detected_dev->dev = dev; | |
7323 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7324 | } else { | |
7325 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7326 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7327 | } | |
1da177e4 LT |
7328 | } |
7329 | ||
7330 | ||
7331 | static void autostart_arrays(int part) | |
7332 | { | |
7333 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7334 | struct detected_devices_node *node_detected_dev; |
7335 | dev_t dev; | |
7336 | int i_scanned, i_passed; | |
1da177e4 | 7337 | |
4d936ec1 ME |
7338 | i_scanned = 0; |
7339 | i_passed = 0; | |
1da177e4 | 7340 | |
4d936ec1 | 7341 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7342 | |
4d936ec1 ME |
7343 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7344 | i_scanned++; | |
7345 | node_detected_dev = list_entry(all_detected_devices.next, | |
7346 | struct detected_devices_node, list); | |
7347 | list_del(&node_detected_dev->list); | |
7348 | dev = node_detected_dev->dev; | |
7349 | kfree(node_detected_dev); | |
df968c4e | 7350 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7351 | if (IS_ERR(rdev)) |
7352 | continue; | |
7353 | ||
b2d444d7 | 7354 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7355 | MD_BUG(); |
7356 | continue; | |
7357 | } | |
d0fae18f | 7358 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 7359 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 7360 | i_passed++; |
1da177e4 | 7361 | } |
4d936ec1 ME |
7362 | |
7363 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
7364 | i_scanned, i_passed); | |
1da177e4 LT |
7365 | |
7366 | autorun_devices(part); | |
7367 | } | |
7368 | ||
fdee8ae4 | 7369 | #endif /* !MODULE */ |
1da177e4 LT |
7370 | |
7371 | static __exit void md_exit(void) | |
7372 | { | |
7373 | mddev_t *mddev; | |
7374 | struct list_head *tmp; | |
8ab5e4c1 | 7375 | |
3dbd8c2e | 7376 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 7377 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 7378 | |
3dbd8c2e | 7379 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
7380 | unregister_blkdev(mdp_major, "mdp"); |
7381 | unregister_reboot_notifier(&md_notifier); | |
7382 | unregister_sysctl_table(raid_table_header); | |
7383 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 7384 | for_each_mddev(mddev, tmp) { |
1da177e4 | 7385 | export_array(mddev); |
d3374825 | 7386 | mddev->hold_active = 0; |
1da177e4 LT |
7387 | } |
7388 | } | |
7389 | ||
685784aa | 7390 | subsys_initcall(md_init); |
1da177e4 LT |
7391 | module_exit(md_exit) |
7392 | ||
f91de92e N |
7393 | static int get_ro(char *buffer, struct kernel_param *kp) |
7394 | { | |
7395 | return sprintf(buffer, "%d", start_readonly); | |
7396 | } | |
7397 | static int set_ro(const char *val, struct kernel_param *kp) | |
7398 | { | |
7399 | char *e; | |
7400 | int num = simple_strtoul(val, &e, 10); | |
7401 | if (*val && (*e == '\0' || *e == '\n')) { | |
7402 | start_readonly = num; | |
4dbcdc75 | 7403 | return 0; |
f91de92e N |
7404 | } |
7405 | return -EINVAL; | |
7406 | } | |
7407 | ||
80ca3a44 N |
7408 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
7409 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 7410 | |
efeb53c0 | 7411 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 7412 | |
1da177e4 LT |
7413 | EXPORT_SYMBOL(register_md_personality); |
7414 | EXPORT_SYMBOL(unregister_md_personality); | |
7415 | EXPORT_SYMBOL(md_error); | |
7416 | EXPORT_SYMBOL(md_done_sync); | |
7417 | EXPORT_SYMBOL(md_write_start); | |
7418 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
7419 | EXPORT_SYMBOL(md_register_thread); |
7420 | EXPORT_SYMBOL(md_unregister_thread); | |
7421 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
7422 | EXPORT_SYMBOL(md_check_recovery); |
7423 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7424 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 7425 | MODULE_ALIAS("md"); |
72008652 | 7426 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |