Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
2a48fc0a | 39 | #include <linux/mutex.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 | ||
1da177e4 | 60 | #ifndef MODULE |
d710e138 | 61 | static void autostart_arrays(int part); |
1da177e4 LT |
62 | #endif |
63 | ||
2604b703 | 64 | static LIST_HEAD(pers_list); |
1da177e4 LT |
65 | static DEFINE_SPINLOCK(pers_lock); |
66 | ||
5e56341d AB |
67 | static void md_print_devices(void); |
68 | ||
90b08710 | 69 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
70 | static struct workqueue_struct *md_wq; |
71 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 72 | |
5e56341d AB |
73 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
74 | ||
1e50915f RB |
75 | /* |
76 | * Default number of read corrections we'll attempt on an rdev | |
77 | * before ejecting it from the array. We divide the read error | |
78 | * count by 2 for every hour elapsed between read errors. | |
79 | */ | |
80 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
81 | /* |
82 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
83 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
84 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 85 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
86 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
87 | * speed limit - in case reconstruction slows down your system despite | |
88 | * idle IO detection. | |
89 | * | |
90 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 91 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
92 | */ |
93 | ||
94 | static int sysctl_speed_limit_min = 1000; | |
95 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
96 | static inline int speed_min(mddev_t *mddev) |
97 | { | |
98 | return mddev->sync_speed_min ? | |
99 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
100 | } | |
101 | ||
102 | static inline int speed_max(mddev_t *mddev) | |
103 | { | |
104 | return mddev->sync_speed_max ? | |
105 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
106 | } | |
1da177e4 LT |
107 | |
108 | static struct ctl_table_header *raid_table_header; | |
109 | ||
110 | static ctl_table raid_table[] = { | |
111 | { | |
1da177e4 LT |
112 | .procname = "speed_limit_min", |
113 | .data = &sysctl_speed_limit_min, | |
114 | .maxlen = sizeof(int), | |
80ca3a44 | 115 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 116 | .proc_handler = proc_dointvec, |
1da177e4 LT |
117 | }, |
118 | { | |
1da177e4 LT |
119 | .procname = "speed_limit_max", |
120 | .data = &sysctl_speed_limit_max, | |
121 | .maxlen = sizeof(int), | |
80ca3a44 | 122 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 123 | .proc_handler = proc_dointvec, |
1da177e4 | 124 | }, |
894d2491 | 125 | { } |
1da177e4 LT |
126 | }; |
127 | ||
128 | static ctl_table raid_dir_table[] = { | |
129 | { | |
1da177e4 LT |
130 | .procname = "raid", |
131 | .maxlen = 0, | |
80ca3a44 | 132 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
133 | .child = raid_table, |
134 | }, | |
894d2491 | 135 | { } |
1da177e4 LT |
136 | }; |
137 | ||
138 | static ctl_table raid_root_table[] = { | |
139 | { | |
1da177e4 LT |
140 | .procname = "dev", |
141 | .maxlen = 0, | |
142 | .mode = 0555, | |
143 | .child = raid_dir_table, | |
144 | }, | |
894d2491 | 145 | { } |
1da177e4 LT |
146 | }; |
147 | ||
83d5cde4 | 148 | static const struct block_device_operations md_fops; |
1da177e4 | 149 | |
f91de92e N |
150 | static int start_readonly; |
151 | ||
a167f663 N |
152 | /* bio_clone_mddev |
153 | * like bio_clone, but with a local bio set | |
154 | */ | |
155 | ||
156 | static void mddev_bio_destructor(struct bio *bio) | |
157 | { | |
158 | mddev_t *mddev, **mddevp; | |
159 | ||
160 | mddevp = (void*)bio; | |
161 | mddev = mddevp[-1]; | |
162 | ||
163 | bio_free(bio, mddev->bio_set); | |
164 | } | |
165 | ||
166 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, | |
167 | mddev_t *mddev) | |
168 | { | |
169 | struct bio *b; | |
170 | mddev_t **mddevp; | |
171 | ||
172 | if (!mddev || !mddev->bio_set) | |
173 | return bio_alloc(gfp_mask, nr_iovecs); | |
174 | ||
175 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, | |
176 | mddev->bio_set); | |
177 | if (!b) | |
178 | return NULL; | |
179 | mddevp = (void*)b; | |
180 | mddevp[-1] = mddev; | |
181 | b->bi_destructor = mddev_bio_destructor; | |
182 | return b; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
185 | ||
186 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
187 | mddev_t *mddev) | |
188 | { | |
189 | struct bio *b; | |
190 | mddev_t **mddevp; | |
191 | ||
192 | if (!mddev || !mddev->bio_set) | |
193 | return bio_clone(bio, gfp_mask); | |
194 | ||
195 | b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, | |
196 | mddev->bio_set); | |
197 | if (!b) | |
198 | return NULL; | |
199 | mddevp = (void*)b; | |
200 | mddevp[-1] = mddev; | |
201 | b->bi_destructor = mddev_bio_destructor; | |
202 | __bio_clone(b, bio); | |
203 | if (bio_integrity(bio)) { | |
204 | int ret; | |
205 | ||
206 | ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set); | |
207 | ||
208 | if (ret < 0) { | |
209 | bio_put(b); | |
210 | return NULL; | |
211 | } | |
212 | } | |
213 | ||
214 | return b; | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
217 | ||
d7603b7e N |
218 | /* |
219 | * We have a system wide 'event count' that is incremented | |
220 | * on any 'interesting' event, and readers of /proc/mdstat | |
221 | * can use 'poll' or 'select' to find out when the event | |
222 | * count increases. | |
223 | * | |
224 | * Events are: | |
225 | * start array, stop array, error, add device, remove device, | |
226 | * start build, activate spare | |
227 | */ | |
2989ddbd | 228 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 229 | static atomic_t md_event_count; |
29269553 | 230 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
231 | { |
232 | atomic_inc(&md_event_count); | |
233 | wake_up(&md_event_waiters); | |
234 | } | |
29269553 | 235 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 236 | |
c331eb04 N |
237 | /* Alternate version that can be called from interrupts |
238 | * when calling sysfs_notify isn't needed. | |
239 | */ | |
05381954 | 240 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
241 | { |
242 | atomic_inc(&md_event_count); | |
243 | wake_up(&md_event_waiters); | |
244 | } | |
245 | ||
1da177e4 LT |
246 | /* |
247 | * Enables to iterate over all existing md arrays | |
248 | * all_mddevs_lock protects this list. | |
249 | */ | |
250 | static LIST_HEAD(all_mddevs); | |
251 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
252 | ||
253 | ||
254 | /* | |
255 | * iterates through all used mddevs in the system. | |
256 | * We take care to grab the all_mddevs_lock whenever navigating | |
257 | * the list, and to always hold a refcount when unlocked. | |
258 | * Any code which breaks out of this loop while own | |
259 | * a reference to the current mddev and must mddev_put it. | |
260 | */ | |
29ac4aa3 | 261 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
262 | \ |
263 | for (({ spin_lock(&all_mddevs_lock); \ | |
264 | tmp = all_mddevs.next; \ | |
265 | mddev = NULL;}); \ | |
266 | ({ if (tmp != &all_mddevs) \ | |
267 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
268 | spin_unlock(&all_mddevs_lock); \ | |
269 | if (mddev) mddev_put(mddev); \ | |
270 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
271 | tmp != &all_mddevs;}); \ | |
272 | ({ spin_lock(&all_mddevs_lock); \ | |
273 | tmp = tmp->next;}) \ | |
274 | ) | |
275 | ||
276 | ||
409c57f3 N |
277 | /* Rather than calling directly into the personality make_request function, |
278 | * IO requests come here first so that we can check if the device is | |
279 | * being suspended pending a reconfiguration. | |
280 | * We hold a refcount over the call to ->make_request. By the time that | |
281 | * call has finished, the bio has been linked into some internal structure | |
282 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
283 | */ | |
284 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 285 | { |
49077326 | 286 | const int rw = bio_data_dir(bio); |
409c57f3 N |
287 | mddev_t *mddev = q->queuedata; |
288 | int rv; | |
49077326 N |
289 | int cpu; |
290 | ||
409c57f3 N |
291 | if (mddev == NULL || mddev->pers == NULL) { |
292 | bio_io_error(bio); | |
293 | return 0; | |
294 | } | |
295 | rcu_read_lock(); | |
e9c7469b | 296 | if (mddev->suspended) { |
409c57f3 N |
297 | DEFINE_WAIT(__wait); |
298 | for (;;) { | |
299 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
300 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 301 | if (!mddev->suspended) |
409c57f3 N |
302 | break; |
303 | rcu_read_unlock(); | |
304 | schedule(); | |
305 | rcu_read_lock(); | |
306 | } | |
307 | finish_wait(&mddev->sb_wait, &__wait); | |
308 | } | |
309 | atomic_inc(&mddev->active_io); | |
310 | rcu_read_unlock(); | |
49077326 | 311 | |
21a52c6d | 312 | rv = mddev->pers->make_request(mddev, bio); |
49077326 N |
313 | |
314 | cpu = part_stat_lock(); | |
315 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
316 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], | |
317 | bio_sectors(bio)); | |
318 | part_stat_unlock(); | |
319 | ||
409c57f3 N |
320 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
321 | wake_up(&mddev->sb_wait); | |
322 | ||
323 | return rv; | |
324 | } | |
325 | ||
9e35b99c N |
326 | /* mddev_suspend makes sure no new requests are submitted |
327 | * to the device, and that any requests that have been submitted | |
328 | * are completely handled. | |
329 | * Once ->stop is called and completes, the module will be completely | |
330 | * unused. | |
331 | */ | |
390ee602 | 332 | void mddev_suspend(mddev_t *mddev) |
409c57f3 N |
333 | { |
334 | BUG_ON(mddev->suspended); | |
335 | mddev->suspended = 1; | |
336 | synchronize_rcu(); | |
337 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
338 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 339 | } |
390ee602 | 340 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 341 | |
390ee602 | 342 | void mddev_resume(mddev_t *mddev) |
409c57f3 N |
343 | { |
344 | mddev->suspended = 0; | |
345 | wake_up(&mddev->sb_wait); | |
346 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 | 347 | } |
390ee602 | 348 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 349 | |
3fa841d7 N |
350 | int mddev_congested(mddev_t *mddev, int bits) |
351 | { | |
352 | return mddev->suspended; | |
353 | } | |
354 | EXPORT_SYMBOL(mddev_congested); | |
355 | ||
a2826aa9 | 356 | /* |
e9c7469b | 357 | * Generic flush handling for md |
a2826aa9 N |
358 | */ |
359 | ||
e9c7469b | 360 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 N |
361 | { |
362 | mdk_rdev_t *rdev = bio->bi_private; | |
363 | mddev_t *mddev = rdev->mddev; | |
a2826aa9 N |
364 | |
365 | rdev_dec_pending(rdev, mddev); | |
366 | ||
367 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 368 | /* The pre-request flush has finished */ |
e804ac78 | 369 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
370 | } |
371 | bio_put(bio); | |
372 | } | |
373 | ||
a7a07e69 N |
374 | static void md_submit_flush_data(struct work_struct *ws); |
375 | ||
a035fc3e | 376 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 377 | { |
a035fc3e | 378 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
a2826aa9 N |
379 | mdk_rdev_t *rdev; |
380 | ||
a7a07e69 N |
381 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
382 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 N |
383 | rcu_read_lock(); |
384 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
385 | if (rdev->raid_disk >= 0 && | |
386 | !test_bit(Faulty, &rdev->flags)) { | |
387 | /* Take two references, one is dropped | |
388 | * when request finishes, one after | |
389 | * we reclaim rcu_read_lock | |
390 | */ | |
391 | struct bio *bi; | |
392 | atomic_inc(&rdev->nr_pending); | |
393 | atomic_inc(&rdev->nr_pending); | |
394 | rcu_read_unlock(); | |
a167f663 | 395 | bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); |
e9c7469b | 396 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
397 | bi->bi_private = rdev; |
398 | bi->bi_bdev = rdev->bdev; | |
399 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 400 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
401 | rcu_read_lock(); |
402 | rdev_dec_pending(rdev, mddev); | |
403 | } | |
404 | rcu_read_unlock(); | |
a7a07e69 N |
405 | if (atomic_dec_and_test(&mddev->flush_pending)) |
406 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
407 | } |
408 | ||
e9c7469b | 409 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 410 | { |
e9c7469b TH |
411 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
412 | struct bio *bio = mddev->flush_bio; | |
a2826aa9 | 413 | |
e9c7469b | 414 | if (bio->bi_size == 0) |
a2826aa9 N |
415 | /* an empty barrier - all done */ |
416 | bio_endio(bio, 0); | |
417 | else { | |
e9c7469b | 418 | bio->bi_rw &= ~REQ_FLUSH; |
21a52c6d | 419 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 | 420 | generic_make_request(bio); |
a2826aa9 | 421 | } |
2b74e12e N |
422 | |
423 | mddev->flush_bio = NULL; | |
424 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
425 | } |
426 | ||
e9c7469b | 427 | void md_flush_request(mddev_t *mddev, struct bio *bio) |
a2826aa9 N |
428 | { |
429 | spin_lock_irq(&mddev->write_lock); | |
430 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 431 | !mddev->flush_bio, |
a2826aa9 | 432 | mddev->write_lock, /*nothing*/); |
e9c7469b | 433 | mddev->flush_bio = bio; |
a2826aa9 N |
434 | spin_unlock_irq(&mddev->write_lock); |
435 | ||
a035fc3e N |
436 | INIT_WORK(&mddev->flush_work, submit_flushes); |
437 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 438 | } |
e9c7469b | 439 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 440 | |
2ac87401 N |
441 | /* Support for plugging. |
442 | * This mirrors the plugging support in request_queue, but does not | |
443 | * require having a whole queue | |
444 | */ | |
445 | static void plugger_work(struct work_struct *work) | |
446 | { | |
447 | struct plug_handle *plug = | |
448 | container_of(work, struct plug_handle, unplug_work); | |
449 | plug->unplug_fn(plug); | |
450 | } | |
451 | static void plugger_timeout(unsigned long data) | |
452 | { | |
453 | struct plug_handle *plug = (void *)data; | |
454 | kblockd_schedule_work(NULL, &plug->unplug_work); | |
455 | } | |
456 | void plugger_init(struct plug_handle *plug, | |
457 | void (*unplug_fn)(struct plug_handle *)) | |
458 | { | |
459 | plug->unplug_flag = 0; | |
460 | plug->unplug_fn = unplug_fn; | |
461 | init_timer(&plug->unplug_timer); | |
462 | plug->unplug_timer.function = plugger_timeout; | |
463 | plug->unplug_timer.data = (unsigned long)plug; | |
464 | INIT_WORK(&plug->unplug_work, plugger_work); | |
465 | } | |
466 | EXPORT_SYMBOL_GPL(plugger_init); | |
467 | ||
468 | void plugger_set_plug(struct plug_handle *plug) | |
469 | { | |
470 | if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag)) | |
471 | mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1); | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(plugger_set_plug); | |
474 | ||
475 | int plugger_remove_plug(struct plug_handle *plug) | |
476 | { | |
477 | if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) { | |
478 | del_timer(&plug->unplug_timer); | |
479 | return 1; | |
480 | } else | |
481 | return 0; | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(plugger_remove_plug); | |
484 | ||
485 | ||
1da177e4 LT |
486 | static inline mddev_t *mddev_get(mddev_t *mddev) |
487 | { | |
488 | atomic_inc(&mddev->active); | |
489 | return mddev; | |
490 | } | |
491 | ||
5fd3a17e | 492 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 493 | |
1da177e4 LT |
494 | static void mddev_put(mddev_t *mddev) |
495 | { | |
a167f663 N |
496 | struct bio_set *bs = NULL; |
497 | ||
1da177e4 LT |
498 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
499 | return; | |
d3374825 | 500 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
501 | mddev->ctime == 0 && !mddev->hold_active) { |
502 | /* Array is not configured at all, and not held active, | |
503 | * so destroy it */ | |
1da177e4 | 504 | list_del(&mddev->all_mddevs); |
a167f663 N |
505 | bs = mddev->bio_set; |
506 | mddev->bio_set = NULL; | |
d3374825 | 507 | if (mddev->gendisk) { |
e804ac78 TH |
508 | /* We did a probe so need to clean up. Call |
509 | * queue_work inside the spinlock so that | |
510 | * flush_workqueue() after mddev_find will | |
511 | * succeed in waiting for the work to be done. | |
d3374825 N |
512 | */ |
513 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 514 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
515 | } else |
516 | kfree(mddev); | |
517 | } | |
518 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
519 | if (bs) |
520 | bioset_free(bs); | |
1da177e4 LT |
521 | } |
522 | ||
390ee602 | 523 | void mddev_init(mddev_t *mddev) |
fafd7fb0 N |
524 | { |
525 | mutex_init(&mddev->open_mutex); | |
526 | mutex_init(&mddev->reconfig_mutex); | |
527 | mutex_init(&mddev->bitmap_info.mutex); | |
528 | INIT_LIST_HEAD(&mddev->disks); | |
529 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
530 | init_timer(&mddev->safemode_timer); | |
531 | atomic_set(&mddev->active, 1); | |
532 | atomic_set(&mddev->openers, 0); | |
533 | atomic_set(&mddev->active_io, 0); | |
534 | spin_lock_init(&mddev->write_lock); | |
535 | atomic_set(&mddev->flush_pending, 0); | |
536 | init_waitqueue_head(&mddev->sb_wait); | |
537 | init_waitqueue_head(&mddev->recovery_wait); | |
538 | mddev->reshape_position = MaxSector; | |
539 | mddev->resync_min = 0; | |
540 | mddev->resync_max = MaxSector; | |
541 | mddev->level = LEVEL_NONE; | |
542 | } | |
390ee602 | 543 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 544 | |
1da177e4 LT |
545 | static mddev_t * mddev_find(dev_t unit) |
546 | { | |
547 | mddev_t *mddev, *new = NULL; | |
548 | ||
549 | retry: | |
550 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
551 | |
552 | if (unit) { | |
553 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
554 | if (mddev->unit == unit) { | |
555 | mddev_get(mddev); | |
556 | spin_unlock(&all_mddevs_lock); | |
557 | kfree(new); | |
558 | return mddev; | |
559 | } | |
560 | ||
561 | if (new) { | |
562 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 563 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
564 | new->hold_active = UNTIL_IOCTL; |
565 | return new; | |
1da177e4 | 566 | } |
efeb53c0 N |
567 | } else if (new) { |
568 | /* find an unused unit number */ | |
569 | static int next_minor = 512; | |
570 | int start = next_minor; | |
571 | int is_free = 0; | |
572 | int dev = 0; | |
573 | while (!is_free) { | |
574 | dev = MKDEV(MD_MAJOR, next_minor); | |
575 | next_minor++; | |
576 | if (next_minor > MINORMASK) | |
577 | next_minor = 0; | |
578 | if (next_minor == start) { | |
579 | /* Oh dear, all in use. */ | |
580 | spin_unlock(&all_mddevs_lock); | |
581 | kfree(new); | |
582 | return NULL; | |
583 | } | |
584 | ||
585 | is_free = 1; | |
586 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
587 | if (mddev->unit == dev) { | |
588 | is_free = 0; | |
589 | break; | |
590 | } | |
591 | } | |
592 | new->unit = dev; | |
593 | new->md_minor = MINOR(dev); | |
594 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
595 | list_add(&new->all_mddevs, &all_mddevs); |
596 | spin_unlock(&all_mddevs_lock); | |
597 | return new; | |
598 | } | |
599 | spin_unlock(&all_mddevs_lock); | |
600 | ||
9ffae0cf | 601 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
602 | if (!new) |
603 | return NULL; | |
604 | ||
1da177e4 LT |
605 | new->unit = unit; |
606 | if (MAJOR(unit) == MD_MAJOR) | |
607 | new->md_minor = MINOR(unit); | |
608 | else | |
609 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
610 | ||
fafd7fb0 | 611 | mddev_init(new); |
1da177e4 | 612 | |
1da177e4 LT |
613 | goto retry; |
614 | } | |
615 | ||
616 | static inline int mddev_lock(mddev_t * mddev) | |
617 | { | |
df5b89b3 | 618 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
619 | } |
620 | ||
b522adcd DW |
621 | static inline int mddev_is_locked(mddev_t *mddev) |
622 | { | |
623 | return mutex_is_locked(&mddev->reconfig_mutex); | |
624 | } | |
625 | ||
1da177e4 LT |
626 | static inline int mddev_trylock(mddev_t * mddev) |
627 | { | |
df5b89b3 | 628 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
629 | } |
630 | ||
b6eb127d N |
631 | static struct attribute_group md_redundancy_group; |
632 | ||
a64c876f | 633 | static void mddev_unlock(mddev_t * mddev) |
1da177e4 | 634 | { |
a64c876f | 635 | if (mddev->to_remove) { |
b6eb127d N |
636 | /* These cannot be removed under reconfig_mutex as |
637 | * an access to the files will try to take reconfig_mutex | |
638 | * while holding the file unremovable, which leads to | |
639 | * a deadlock. | |
bb4f1e9d N |
640 | * So hold set sysfs_active while the remove in happeing, |
641 | * and anything else which might set ->to_remove or my | |
642 | * otherwise change the sysfs namespace will fail with | |
643 | * -EBUSY if sysfs_active is still set. | |
644 | * We set sysfs_active under reconfig_mutex and elsewhere | |
645 | * test it under the same mutex to ensure its correct value | |
646 | * is seen. | |
b6eb127d | 647 | */ |
a64c876f N |
648 | struct attribute_group *to_remove = mddev->to_remove; |
649 | mddev->to_remove = NULL; | |
bb4f1e9d | 650 | mddev->sysfs_active = 1; |
b6eb127d N |
651 | mutex_unlock(&mddev->reconfig_mutex); |
652 | ||
00bcb4ac N |
653 | if (mddev->kobj.sd) { |
654 | if (to_remove != &md_redundancy_group) | |
655 | sysfs_remove_group(&mddev->kobj, to_remove); | |
656 | if (mddev->pers == NULL || | |
657 | mddev->pers->sync_request == NULL) { | |
658 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
659 | if (mddev->sysfs_action) | |
660 | sysfs_put(mddev->sysfs_action); | |
661 | mddev->sysfs_action = NULL; | |
662 | } | |
a64c876f | 663 | } |
bb4f1e9d | 664 | mddev->sysfs_active = 0; |
b6eb127d N |
665 | } else |
666 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 667 | |
005eca5e | 668 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
669 | } |
670 | ||
2989ddbd | 671 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 672 | { |
159ec1fc | 673 | mdk_rdev_t *rdev; |
1da177e4 | 674 | |
159ec1fc | 675 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
676 | if (rdev->desc_nr == nr) |
677 | return rdev; | |
159ec1fc | 678 | |
1da177e4 LT |
679 | return NULL; |
680 | } | |
681 | ||
682 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
683 | { | |
1da177e4 LT |
684 | mdk_rdev_t *rdev; |
685 | ||
159ec1fc | 686 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
687 | if (rdev->bdev->bd_dev == dev) |
688 | return rdev; | |
159ec1fc | 689 | |
1da177e4 LT |
690 | return NULL; |
691 | } | |
692 | ||
d9d166c2 | 693 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
694 | { |
695 | struct mdk_personality *pers; | |
d9d166c2 N |
696 | list_for_each_entry(pers, &pers_list, list) { |
697 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 698 | return pers; |
d9d166c2 N |
699 | if (strcmp(pers->name, clevel)==0) |
700 | return pers; | |
701 | } | |
2604b703 N |
702 | return NULL; |
703 | } | |
704 | ||
b73df2d3 | 705 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 706 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 707 | { |
77304d2a | 708 | sector_t num_sectors = i_size_read(bdev->bd_inode) / 512; |
b73df2d3 | 709 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
710 | } |
711 | ||
1da177e4 LT |
712 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
713 | { | |
714 | if (rdev->sb_page) | |
715 | MD_BUG(); | |
716 | ||
717 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
718 | if (!rdev->sb_page) { | |
719 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 720 | return -ENOMEM; |
1da177e4 LT |
721 | } |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | static void free_disk_sb(mdk_rdev_t * rdev) | |
727 | { | |
728 | if (rdev->sb_page) { | |
2d1f3b5d | 729 | put_page(rdev->sb_page); |
1da177e4 LT |
730 | rdev->sb_loaded = 0; |
731 | rdev->sb_page = NULL; | |
0f420358 | 732 | rdev->sb_start = 0; |
dd8ac336 | 733 | rdev->sectors = 0; |
1da177e4 LT |
734 | } |
735 | } | |
736 | ||
737 | ||
6712ecf8 | 738 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
739 | { |
740 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 741 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 742 | |
3a0f5bbb N |
743 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
744 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
745 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
746 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 747 | md_error(mddev, rdev); |
3a0f5bbb | 748 | } |
7bfa19f2 | 749 | |
a9701a30 N |
750 | if (atomic_dec_and_test(&mddev->pending_writes)) |
751 | wake_up(&mddev->sb_wait); | |
f8b58edf | 752 | bio_put(bio); |
7bfa19f2 N |
753 | } |
754 | ||
755 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
756 | sector_t sector, int size, struct page *page) | |
757 | { | |
758 | /* write first size bytes of page to sector of rdev | |
759 | * Increment mddev->pending_writes before returning | |
760 | * and decrement it on completion, waking up sb_wait | |
761 | * if zero is reached. | |
762 | * If an error occurred, call md_error | |
763 | */ | |
a167f663 | 764 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 N |
765 | |
766 | bio->bi_bdev = rdev->bdev; | |
767 | bio->bi_sector = sector; | |
768 | bio_add_page(bio, page, size, 0); | |
769 | bio->bi_private = rdev; | |
770 | bio->bi_end_io = super_written; | |
a9701a30 | 771 | |
7bfa19f2 | 772 | atomic_inc(&mddev->pending_writes); |
e9c7469b TH |
773 | submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA, |
774 | bio); | |
a9701a30 N |
775 | } |
776 | ||
777 | void md_super_wait(mddev_t *mddev) | |
778 | { | |
e9c7469b | 779 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
780 | DEFINE_WAIT(wq); |
781 | for(;;) { | |
782 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
783 | if (atomic_read(&mddev->pending_writes)==0) | |
784 | break; | |
a9701a30 N |
785 | schedule(); |
786 | } | |
787 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
788 | } |
789 | ||
6712ecf8 | 790 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 791 | { |
1da177e4 | 792 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
793 | } |
794 | ||
2b193363 N |
795 | int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size, |
796 | struct page *page, int rw) | |
1da177e4 | 797 | { |
a167f663 | 798 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
799 | struct completion event; |
800 | int ret; | |
801 | ||
7b6d91da | 802 | rw |= REQ_SYNC | REQ_UNPLUG; |
1da177e4 | 803 | |
2b193363 | 804 | bio->bi_bdev = rdev->bdev; |
1da177e4 LT |
805 | bio->bi_sector = sector; |
806 | bio_add_page(bio, page, size, 0); | |
807 | init_completion(&event); | |
808 | bio->bi_private = &event; | |
809 | bio->bi_end_io = bi_complete; | |
810 | submit_bio(rw, bio); | |
811 | wait_for_completion(&event); | |
812 | ||
813 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
814 | bio_put(bio); | |
815 | return ret; | |
816 | } | |
a8745db2 | 817 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 818 | |
0002b271 | 819 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
820 | { |
821 | char b[BDEVNAME_SIZE]; | |
822 | if (!rdev->sb_page) { | |
823 | MD_BUG(); | |
824 | return -EINVAL; | |
825 | } | |
826 | if (rdev->sb_loaded) | |
827 | return 0; | |
828 | ||
829 | ||
2b193363 | 830 | if (!sync_page_io(rdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
831 | goto fail; |
832 | rdev->sb_loaded = 1; | |
833 | return 0; | |
834 | ||
835 | fail: | |
836 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
837 | bdevname(rdev->bdev,b)); | |
838 | return -EINVAL; | |
839 | } | |
840 | ||
841 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
842 | { | |
05710466 AN |
843 | return sb1->set_uuid0 == sb2->set_uuid0 && |
844 | sb1->set_uuid1 == sb2->set_uuid1 && | |
845 | sb1->set_uuid2 == sb2->set_uuid2 && | |
846 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
847 | } |
848 | ||
1da177e4 LT |
849 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
850 | { | |
851 | int ret; | |
852 | mdp_super_t *tmp1, *tmp2; | |
853 | ||
854 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
855 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
856 | ||
857 | if (!tmp1 || !tmp2) { | |
858 | ret = 0; | |
35020f1a | 859 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
860 | goto abort; |
861 | } | |
862 | ||
863 | *tmp1 = *sb1; | |
864 | *tmp2 = *sb2; | |
865 | ||
866 | /* | |
867 | * nr_disks is not constant | |
868 | */ | |
869 | tmp1->nr_disks = 0; | |
870 | tmp2->nr_disks = 0; | |
871 | ||
ce0c8e05 | 872 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 873 | abort: |
990a8baf JJ |
874 | kfree(tmp1); |
875 | kfree(tmp2); | |
1da177e4 LT |
876 | return ret; |
877 | } | |
878 | ||
4d167f09 N |
879 | |
880 | static u32 md_csum_fold(u32 csum) | |
881 | { | |
882 | csum = (csum & 0xffff) + (csum >> 16); | |
883 | return (csum & 0xffff) + (csum >> 16); | |
884 | } | |
885 | ||
1da177e4 LT |
886 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
887 | { | |
4d167f09 N |
888 | u64 newcsum = 0; |
889 | u32 *sb32 = (u32*)sb; | |
890 | int i; | |
1da177e4 LT |
891 | unsigned int disk_csum, csum; |
892 | ||
893 | disk_csum = sb->sb_csum; | |
894 | sb->sb_csum = 0; | |
4d167f09 N |
895 | |
896 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
897 | newcsum += sb32[i]; | |
898 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
899 | ||
900 | ||
901 | #ifdef CONFIG_ALPHA | |
902 | /* This used to use csum_partial, which was wrong for several | |
903 | * reasons including that different results are returned on | |
904 | * different architectures. It isn't critical that we get exactly | |
905 | * the same return value as before (we always csum_fold before | |
906 | * testing, and that removes any differences). However as we | |
907 | * know that csum_partial always returned a 16bit value on | |
908 | * alphas, do a fold to maximise conformity to previous behaviour. | |
909 | */ | |
910 | sb->sb_csum = md_csum_fold(disk_csum); | |
911 | #else | |
1da177e4 | 912 | sb->sb_csum = disk_csum; |
4d167f09 | 913 | #endif |
1da177e4 LT |
914 | return csum; |
915 | } | |
916 | ||
917 | ||
918 | /* | |
919 | * Handle superblock details. | |
920 | * We want to be able to handle multiple superblock formats | |
921 | * so we have a common interface to them all, and an array of | |
922 | * different handlers. | |
923 | * We rely on user-space to write the initial superblock, and support | |
924 | * reading and updating of superblocks. | |
925 | * Interface methods are: | |
926 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
927 | * loads and validates a superblock on dev. | |
928 | * if refdev != NULL, compare superblocks on both devices | |
929 | * Return: | |
930 | * 0 - dev has a superblock that is compatible with refdev | |
931 | * 1 - dev has a superblock that is compatible and newer than refdev | |
932 | * so dev should be used as the refdev in future | |
933 | * -EINVAL superblock incompatible or invalid | |
934 | * -othererror e.g. -EIO | |
935 | * | |
936 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
937 | * Verify that dev is acceptable into mddev. | |
938 | * The first time, mddev->raid_disks will be 0, and data from | |
939 | * dev should be merged in. Subsequent calls check that dev | |
940 | * is new enough. Return 0 or -EINVAL | |
941 | * | |
942 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
943 | * Update the superblock for rdev with data in mddev | |
944 | * This does not write to disc. | |
945 | * | |
946 | */ | |
947 | ||
948 | struct super_type { | |
0cd17fec CW |
949 | char *name; |
950 | struct module *owner; | |
951 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
952 | int minor_version); | |
953 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
954 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
955 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 956 | sector_t num_sectors); |
1da177e4 LT |
957 | }; |
958 | ||
0894cc30 AN |
959 | /* |
960 | * Check that the given mddev has no bitmap. | |
961 | * | |
962 | * This function is called from the run method of all personalities that do not | |
963 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
964 | * has a bitmap. Otherwise, it returns 0. | |
965 | * | |
966 | */ | |
967 | int md_check_no_bitmap(mddev_t *mddev) | |
968 | { | |
c3d9714e | 969 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
970 | return 0; |
971 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
972 | mdname(mddev), mddev->pers->name); | |
973 | return 1; | |
974 | } | |
975 | EXPORT_SYMBOL(md_check_no_bitmap); | |
976 | ||
1da177e4 LT |
977 | /* |
978 | * load_super for 0.90.0 | |
979 | */ | |
980 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
981 | { | |
982 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
983 | mdp_super_t *sb; | |
984 | int ret; | |
1da177e4 LT |
985 | |
986 | /* | |
0f420358 | 987 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
988 | * it's at the end of the disk. |
989 | * | |
990 | * It also happens to be a multiple of 4Kb. | |
991 | */ | |
0f420358 | 992 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 993 | |
0002b271 | 994 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
995 | if (ret) return ret; |
996 | ||
997 | ret = -EINVAL; | |
998 | ||
999 | bdevname(rdev->bdev, b); | |
1000 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
1001 | ||
1002 | if (sb->md_magic != MD_SB_MAGIC) { | |
1003 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1004 | b); | |
1005 | goto abort; | |
1006 | } | |
1007 | ||
1008 | if (sb->major_version != 0 || | |
f6705578 N |
1009 | sb->minor_version < 90 || |
1010 | sb->minor_version > 91) { | |
1da177e4 LT |
1011 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1012 | sb->major_version, sb->minor_version, | |
1013 | b); | |
1014 | goto abort; | |
1015 | } | |
1016 | ||
1017 | if (sb->raid_disks <= 0) | |
1018 | goto abort; | |
1019 | ||
4d167f09 | 1020 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1021 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1022 | b); | |
1023 | goto abort; | |
1024 | } | |
1025 | ||
1026 | rdev->preferred_minor = sb->md_minor; | |
1027 | rdev->data_offset = 0; | |
0002b271 | 1028 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
1029 | |
1030 | if (sb->level == LEVEL_MULTIPATH) | |
1031 | rdev->desc_nr = -1; | |
1032 | else | |
1033 | rdev->desc_nr = sb->this_disk.number; | |
1034 | ||
9a7b2b0f | 1035 | if (!refdev) { |
1da177e4 | 1036 | ret = 1; |
9a7b2b0f | 1037 | } else { |
1da177e4 LT |
1038 | __u64 ev1, ev2; |
1039 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
1040 | if (!uuid_equal(refsb, sb)) { | |
1041 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1042 | b, bdevname(refdev->bdev,b2)); | |
1043 | goto abort; | |
1044 | } | |
1045 | if (!sb_equal(refsb, sb)) { | |
1046 | printk(KERN_WARNING "md: %s has same UUID" | |
1047 | " but different superblock to %s\n", | |
1048 | b, bdevname(refdev->bdev, b2)); | |
1049 | goto abort; | |
1050 | } | |
1051 | ev1 = md_event(sb); | |
1052 | ev2 = md_event(refsb); | |
1053 | if (ev1 > ev2) | |
1054 | ret = 1; | |
1055 | else | |
1056 | ret = 0; | |
1057 | } | |
8190e754 | 1058 | rdev->sectors = rdev->sb_start; |
1da177e4 | 1059 | |
dd8ac336 | 1060 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
1061 | /* "this cannot possibly happen" ... */ |
1062 | ret = -EINVAL; | |
1063 | ||
1da177e4 LT |
1064 | abort: |
1065 | return ret; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * validate_super for 0.90.0 | |
1070 | */ | |
1071 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1072 | { | |
1073 | mdp_disk_t *desc; | |
1074 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 1075 | __u64 ev1 = md_event(sb); |
1da177e4 | 1076 | |
41158c7e | 1077 | rdev->raid_disk = -1; |
c5d79adb N |
1078 | clear_bit(Faulty, &rdev->flags); |
1079 | clear_bit(In_sync, &rdev->flags); | |
1080 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1081 | |
1da177e4 LT |
1082 | if (mddev->raid_disks == 0) { |
1083 | mddev->major_version = 0; | |
1084 | mddev->minor_version = sb->minor_version; | |
1085 | mddev->patch_version = sb->patch_version; | |
e691063a | 1086 | mddev->external = 0; |
9d8f0363 | 1087 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1088 | mddev->ctime = sb->ctime; |
1089 | mddev->utime = sb->utime; | |
1090 | mddev->level = sb->level; | |
d9d166c2 | 1091 | mddev->clevel[0] = 0; |
1da177e4 LT |
1092 | mddev->layout = sb->layout; |
1093 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1094 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1095 | mddev->events = ev1; |
c3d9714e N |
1096 | mddev->bitmap_info.offset = 0; |
1097 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1098 | |
f6705578 N |
1099 | if (mddev->minor_version >= 91) { |
1100 | mddev->reshape_position = sb->reshape_position; | |
1101 | mddev->delta_disks = sb->delta_disks; | |
1102 | mddev->new_level = sb->new_level; | |
1103 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1104 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1105 | } else { |
1106 | mddev->reshape_position = MaxSector; | |
1107 | mddev->delta_disks = 0; | |
1108 | mddev->new_level = mddev->level; | |
1109 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1110 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1111 | } |
1112 | ||
1da177e4 LT |
1113 | if (sb->state & (1<<MD_SB_CLEAN)) |
1114 | mddev->recovery_cp = MaxSector; | |
1115 | else { | |
1116 | if (sb->events_hi == sb->cp_events_hi && | |
1117 | sb->events_lo == sb->cp_events_lo) { | |
1118 | mddev->recovery_cp = sb->recovery_cp; | |
1119 | } else | |
1120 | mddev->recovery_cp = 0; | |
1121 | } | |
1122 | ||
1123 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1124 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1125 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1126 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1127 | ||
1128 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1129 | |
1130 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1131 | mddev->bitmap_info.file == NULL) |
1132 | mddev->bitmap_info.offset = | |
1133 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1134 | |
41158c7e | 1135 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1136 | /* Insist on good event counter while assembling, except |
1137 | * for spares (which don't need an event count) */ | |
1da177e4 | 1138 | ++ev1; |
be6800a7 N |
1139 | if (sb->disks[rdev->desc_nr].state & ( |
1140 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1141 | if (ev1 < mddev->events) | |
1142 | return -EINVAL; | |
41158c7e N |
1143 | } else if (mddev->bitmap) { |
1144 | /* if adding to array with a bitmap, then we can accept an | |
1145 | * older device ... but not too old. | |
1146 | */ | |
41158c7e N |
1147 | if (ev1 < mddev->bitmap->events_cleared) |
1148 | return 0; | |
07d84d10 N |
1149 | } else { |
1150 | if (ev1 < mddev->events) | |
1151 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1152 | return 0; | |
1153 | } | |
41158c7e | 1154 | |
1da177e4 | 1155 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1156 | desc = sb->disks + rdev->desc_nr; |
1157 | ||
1158 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1159 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1160 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1161 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1162 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1163 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1164 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1165 | /* active but not in sync implies recovery up to | |
1166 | * reshape position. We don't know exactly where | |
1167 | * that is, so set to zero for now */ | |
1168 | if (mddev->minor_version >= 91) { | |
1169 | rdev->recovery_offset = 0; | |
1170 | rdev->raid_disk = desc->raid_disk; | |
1171 | } | |
1da177e4 | 1172 | } |
8ddf9efe N |
1173 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1174 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1175 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1176 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1177 | return 0; |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * sync_super for 0.90.0 | |
1182 | */ | |
1183 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1184 | { | |
1185 | mdp_super_t *sb; | |
1da177e4 LT |
1186 | mdk_rdev_t *rdev2; |
1187 | int next_spare = mddev->raid_disks; | |
19133a42 | 1188 | |
1da177e4 LT |
1189 | |
1190 | /* make rdev->sb match mddev data.. | |
1191 | * | |
1192 | * 1/ zero out disks | |
1193 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1194 | * 3/ any empty disks < next_spare become removed | |
1195 | * | |
1196 | * disks[0] gets initialised to REMOVED because | |
1197 | * we cannot be sure from other fields if it has | |
1198 | * been initialised or not. | |
1199 | */ | |
1200 | int i; | |
1201 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1202 | ||
61181565 N |
1203 | rdev->sb_size = MD_SB_BYTES; |
1204 | ||
1da177e4 LT |
1205 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
1206 | ||
1207 | memset(sb, 0, sizeof(*sb)); | |
1208 | ||
1209 | sb->md_magic = MD_SB_MAGIC; | |
1210 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1211 | sb->patch_version = mddev->patch_version; |
1212 | sb->gvalid_words = 0; /* ignored */ | |
1213 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1214 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1215 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1216 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1217 | ||
1218 | sb->ctime = mddev->ctime; | |
1219 | sb->level = mddev->level; | |
58c0fed4 | 1220 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1221 | sb->raid_disks = mddev->raid_disks; |
1222 | sb->md_minor = mddev->md_minor; | |
e691063a | 1223 | sb->not_persistent = 0; |
1da177e4 LT |
1224 | sb->utime = mddev->utime; |
1225 | sb->state = 0; | |
1226 | sb->events_hi = (mddev->events>>32); | |
1227 | sb->events_lo = (u32)mddev->events; | |
1228 | ||
f6705578 N |
1229 | if (mddev->reshape_position == MaxSector) |
1230 | sb->minor_version = 90; | |
1231 | else { | |
1232 | sb->minor_version = 91; | |
1233 | sb->reshape_position = mddev->reshape_position; | |
1234 | sb->new_level = mddev->new_level; | |
1235 | sb->delta_disks = mddev->delta_disks; | |
1236 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1237 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1238 | } |
1239 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1240 | if (mddev->in_sync) |
1241 | { | |
1242 | sb->recovery_cp = mddev->recovery_cp; | |
1243 | sb->cp_events_hi = (mddev->events>>32); | |
1244 | sb->cp_events_lo = (u32)mddev->events; | |
1245 | if (mddev->recovery_cp == MaxSector) | |
1246 | sb->state = (1<< MD_SB_CLEAN); | |
1247 | } else | |
1248 | sb->recovery_cp = 0; | |
1249 | ||
1250 | sb->layout = mddev->layout; | |
9d8f0363 | 1251 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1252 | |
c3d9714e | 1253 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1254 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1255 | ||
1da177e4 | 1256 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1257 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1258 | mdp_disk_t *d; |
86e6ffdd | 1259 | int desc_nr; |
0261cd9f N |
1260 | int is_active = test_bit(In_sync, &rdev2->flags); |
1261 | ||
1262 | if (rdev2->raid_disk >= 0 && | |
1263 | sb->minor_version >= 91) | |
1264 | /* we have nowhere to store the recovery_offset, | |
1265 | * but if it is not below the reshape_position, | |
1266 | * we can piggy-back on that. | |
1267 | */ | |
1268 | is_active = 1; | |
1269 | if (rdev2->raid_disk < 0 || | |
1270 | test_bit(Faulty, &rdev2->flags)) | |
1271 | is_active = 0; | |
1272 | if (is_active) | |
86e6ffdd | 1273 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1274 | else |
86e6ffdd | 1275 | desc_nr = next_spare++; |
19133a42 | 1276 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1277 | d = &sb->disks[rdev2->desc_nr]; |
1278 | nr_disks++; | |
1279 | d->number = rdev2->desc_nr; | |
1280 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1281 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1282 | if (is_active) |
1da177e4 LT |
1283 | d->raid_disk = rdev2->raid_disk; |
1284 | else | |
1285 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1286 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1287 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1288 | else if (is_active) { |
1da177e4 | 1289 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1290 | if (test_bit(In_sync, &rdev2->flags)) |
1291 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1292 | active++; |
1293 | working++; | |
1294 | } else { | |
1295 | d->state = 0; | |
1296 | spare++; | |
1297 | working++; | |
1298 | } | |
8ddf9efe N |
1299 | if (test_bit(WriteMostly, &rdev2->flags)) |
1300 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1301 | } |
1da177e4 LT |
1302 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1303 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1304 | mdp_disk_t *d = &sb->disks[i]; | |
1305 | if (d->state == 0 && d->number == 0) { | |
1306 | d->number = i; | |
1307 | d->raid_disk = i; | |
1308 | d->state = (1<<MD_DISK_REMOVED); | |
1309 | d->state |= (1<<MD_DISK_FAULTY); | |
1310 | failed++; | |
1311 | } | |
1312 | } | |
1313 | sb->nr_disks = nr_disks; | |
1314 | sb->active_disks = active; | |
1315 | sb->working_disks = working; | |
1316 | sb->failed_disks = failed; | |
1317 | sb->spare_disks = spare; | |
1318 | ||
1319 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1320 | sb->sb_csum = calc_sb_csum(sb); | |
1321 | } | |
1322 | ||
0cd17fec CW |
1323 | /* |
1324 | * rdev_size_change for 0.90.0 | |
1325 | */ | |
1326 | static unsigned long long | |
15f4a5fd | 1327 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1328 | { |
58c0fed4 | 1329 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1330 | return 0; /* component must fit device */ |
c3d9714e | 1331 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1332 | return 0; /* can't move bitmap */ |
0f420358 | 1333 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1334 | if (!num_sectors || num_sectors > rdev->sb_start) |
1335 | num_sectors = rdev->sb_start; | |
0f420358 | 1336 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1337 | rdev->sb_page); |
1338 | md_super_wait(rdev->mddev); | |
c26a44ed | 1339 | return num_sectors; |
0cd17fec CW |
1340 | } |
1341 | ||
1342 | ||
1da177e4 LT |
1343 | /* |
1344 | * version 1 superblock | |
1345 | */ | |
1346 | ||
1c05b4bc | 1347 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1348 | { |
1c05b4bc N |
1349 | __le32 disk_csum; |
1350 | u32 csum; | |
1da177e4 LT |
1351 | unsigned long long newcsum; |
1352 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1353 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1354 | int i; |
1355 | ||
1356 | disk_csum = sb->sb_csum; | |
1357 | sb->sb_csum = 0; | |
1358 | newcsum = 0; | |
1359 | for (i=0; size>=4; size -= 4 ) | |
1360 | newcsum += le32_to_cpu(*isuper++); | |
1361 | ||
1362 | if (size == 2) | |
1c05b4bc | 1363 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1364 | |
1365 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1366 | sb->sb_csum = disk_csum; | |
1367 | return cpu_to_le32(csum); | |
1368 | } | |
1369 | ||
1370 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1371 | { | |
1372 | struct mdp_superblock_1 *sb; | |
1373 | int ret; | |
0f420358 | 1374 | sector_t sb_start; |
1da177e4 | 1375 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1376 | int bmask; |
1da177e4 LT |
1377 | |
1378 | /* | |
0f420358 | 1379 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1380 | * It is always aligned to a 4K boundary and |
1381 | * depeding on minor_version, it can be: | |
1382 | * 0: At least 8K, but less than 12K, from end of device | |
1383 | * 1: At start of device | |
1384 | * 2: 4K from start of device. | |
1385 | */ | |
1386 | switch(minor_version) { | |
1387 | case 0: | |
77304d2a | 1388 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1389 | sb_start -= 8*2; |
1390 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1391 | break; |
1392 | case 1: | |
0f420358 | 1393 | sb_start = 0; |
1da177e4 LT |
1394 | break; |
1395 | case 2: | |
0f420358 | 1396 | sb_start = 8; |
1da177e4 LT |
1397 | break; |
1398 | default: | |
1399 | return -EINVAL; | |
1400 | } | |
0f420358 | 1401 | rdev->sb_start = sb_start; |
1da177e4 | 1402 | |
0002b271 N |
1403 | /* superblock is rarely larger than 1K, but it can be larger, |
1404 | * and it is safe to read 4k, so we do that | |
1405 | */ | |
1406 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1407 | if (ret) return ret; |
1408 | ||
1409 | ||
1410 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1411 | ||
1412 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1413 | sb->major_version != cpu_to_le32(1) || | |
1414 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1415 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1416 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1417 | return -EINVAL; |
1418 | ||
1419 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1420 | printk("md: invalid superblock checksum on %s\n", | |
1421 | bdevname(rdev->bdev,b)); | |
1422 | return -EINVAL; | |
1423 | } | |
1424 | if (le64_to_cpu(sb->data_size) < 10) { | |
1425 | printk("md: data_size too small on %s\n", | |
1426 | bdevname(rdev->bdev,b)); | |
1427 | return -EINVAL; | |
1428 | } | |
e11e93fa | 1429 | |
1da177e4 LT |
1430 | rdev->preferred_minor = 0xffff; |
1431 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1432 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1433 | |
0002b271 | 1434 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1435 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1436 | if (rdev->sb_size & bmask) |
a1801f85 N |
1437 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1438 | ||
1439 | if (minor_version | |
0f420358 | 1440 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1441 | return -EINVAL; |
0002b271 | 1442 | |
31b65a0d N |
1443 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1444 | rdev->desc_nr = -1; | |
1445 | else | |
1446 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1447 | ||
9a7b2b0f | 1448 | if (!refdev) { |
8ed75463 | 1449 | ret = 1; |
9a7b2b0f | 1450 | } else { |
1da177e4 LT |
1451 | __u64 ev1, ev2; |
1452 | struct mdp_superblock_1 *refsb = | |
1453 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1454 | ||
1455 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1456 | sb->level != refsb->level || | |
1457 | sb->layout != refsb->layout || | |
1458 | sb->chunksize != refsb->chunksize) { | |
1459 | printk(KERN_WARNING "md: %s has strangely different" | |
1460 | " superblock to %s\n", | |
1461 | bdevname(rdev->bdev,b), | |
1462 | bdevname(refdev->bdev,b2)); | |
1463 | return -EINVAL; | |
1464 | } | |
1465 | ev1 = le64_to_cpu(sb->events); | |
1466 | ev2 = le64_to_cpu(refsb->events); | |
1467 | ||
1468 | if (ev1 > ev2) | |
8ed75463 N |
1469 | ret = 1; |
1470 | else | |
1471 | ret = 0; | |
1da177e4 | 1472 | } |
a1801f85 | 1473 | if (minor_version) |
77304d2a | 1474 | rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 1475 | le64_to_cpu(sb->data_offset); |
1da177e4 | 1476 | else |
dd8ac336 AN |
1477 | rdev->sectors = rdev->sb_start; |
1478 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1479 | return -EINVAL; |
dd8ac336 | 1480 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1481 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1482 | return -EINVAL; |
8ed75463 | 1483 | return ret; |
1da177e4 LT |
1484 | } |
1485 | ||
1486 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1487 | { | |
1488 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1489 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1490 | |
41158c7e | 1491 | rdev->raid_disk = -1; |
c5d79adb N |
1492 | clear_bit(Faulty, &rdev->flags); |
1493 | clear_bit(In_sync, &rdev->flags); | |
1494 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1495 | |
1da177e4 LT |
1496 | if (mddev->raid_disks == 0) { |
1497 | mddev->major_version = 1; | |
1498 | mddev->patch_version = 0; | |
e691063a | 1499 | mddev->external = 0; |
9d8f0363 | 1500 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1501 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1502 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1503 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1504 | mddev->clevel[0] = 0; |
1da177e4 LT |
1505 | mddev->layout = le32_to_cpu(sb->layout); |
1506 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1507 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1508 | mddev->events = ev1; |
c3d9714e N |
1509 | mddev->bitmap_info.offset = 0; |
1510 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1511 | |
1512 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1513 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1514 | ||
1515 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1516 | |
71c0805c | 1517 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1518 | mddev->bitmap_info.file == NULL ) |
1519 | mddev->bitmap_info.offset = | |
1520 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1521 | |
f6705578 N |
1522 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1523 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1524 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1525 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1526 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1527 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1528 | } else { |
1529 | mddev->reshape_position = MaxSector; | |
1530 | mddev->delta_disks = 0; | |
1531 | mddev->new_level = mddev->level; | |
1532 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1533 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1534 | } |
1535 | ||
41158c7e | 1536 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1537 | /* Insist of good event counter while assembling, except for |
1538 | * spares (which don't need an event count) */ | |
1da177e4 | 1539 | ++ev1; |
be6800a7 N |
1540 | if (rdev->desc_nr >= 0 && |
1541 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1542 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1543 | if (ev1 < mddev->events) | |
1544 | return -EINVAL; | |
41158c7e N |
1545 | } else if (mddev->bitmap) { |
1546 | /* If adding to array with a bitmap, then we can accept an | |
1547 | * older device, but not too old. | |
1548 | */ | |
41158c7e N |
1549 | if (ev1 < mddev->bitmap->events_cleared) |
1550 | return 0; | |
07d84d10 N |
1551 | } else { |
1552 | if (ev1 < mddev->events) | |
1553 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1554 | return 0; | |
1555 | } | |
1da177e4 LT |
1556 | if (mddev->level != LEVEL_MULTIPATH) { |
1557 | int role; | |
3673f305 N |
1558 | if (rdev->desc_nr < 0 || |
1559 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1560 | role = 0xffff; | |
1561 | rdev->desc_nr = -1; | |
1562 | } else | |
1563 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1564 | switch(role) { |
1565 | case 0xffff: /* spare */ | |
1da177e4 LT |
1566 | break; |
1567 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1568 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1569 | break; |
1570 | default: | |
5fd6c1dc N |
1571 | if ((le32_to_cpu(sb->feature_map) & |
1572 | MD_FEATURE_RECOVERY_OFFSET)) | |
1573 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1574 | else | |
1575 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1576 | rdev->raid_disk = role; |
1577 | break; | |
1578 | } | |
8ddf9efe N |
1579 | if (sb->devflags & WriteMostly1) |
1580 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1581 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1582 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1583 | |
1da177e4 LT |
1584 | return 0; |
1585 | } | |
1586 | ||
1587 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1588 | { | |
1589 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1590 | mdk_rdev_t *rdev2; |
1591 | int max_dev, i; | |
1592 | /* make rdev->sb match mddev and rdev data. */ | |
1593 | ||
1594 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1595 | ||
1596 | sb->feature_map = 0; | |
1597 | sb->pad0 = 0; | |
5fd6c1dc | 1598 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1599 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1600 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1601 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1602 | ||
1603 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1604 | sb->events = cpu_to_le64(mddev->events); | |
1605 | if (mddev->in_sync) | |
1606 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1607 | else | |
1608 | sb->resync_offset = cpu_to_le64(0); | |
1609 | ||
1c05b4bc | 1610 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1611 | |
f0ca340c | 1612 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1613 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1614 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1615 | sb->level = cpu_to_le32(mddev->level); |
1616 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1617 | |
c3d9714e N |
1618 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1619 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1620 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1621 | } |
5fd6c1dc N |
1622 | |
1623 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1624 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1625 | sb->feature_map |= |
1626 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1627 | sb->recovery_offset = | |
1628 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1629 | } |
1630 | ||
f6705578 N |
1631 | if (mddev->reshape_position != MaxSector) { |
1632 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1633 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1634 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1635 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1636 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1637 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1638 | } |
a654b9d8 | 1639 | |
1da177e4 | 1640 | max_dev = 0; |
159ec1fc | 1641 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1642 | if (rdev2->desc_nr+1 > max_dev) |
1643 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1644 | |
70471daf N |
1645 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1646 | int bmask; | |
a778b73f | 1647 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1648 | rdev->sb_size = max_dev * 2 + 256; |
1649 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1650 | if (rdev->sb_size & bmask) | |
1651 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1652 | } else |
1653 | max_dev = le32_to_cpu(sb->max_dev); | |
1654 | ||
1da177e4 LT |
1655 | for (i=0; i<max_dev;i++) |
1656 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1657 | ||
159ec1fc | 1658 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1659 | i = rdev2->desc_nr; |
b2d444d7 | 1660 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1661 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1662 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1663 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1664 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1665 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1666 | else |
1667 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1668 | } | |
1669 | ||
1da177e4 LT |
1670 | sb->sb_csum = calc_sb_1_csum(sb); |
1671 | } | |
1672 | ||
0cd17fec | 1673 | static unsigned long long |
15f4a5fd | 1674 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1675 | { |
1676 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1677 | sector_t max_sectors; |
58c0fed4 | 1678 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1679 | return 0; /* component must fit device */ |
0f420358 | 1680 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1681 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1682 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1683 | max_sectors -= rdev->data_offset; |
1684 | if (!num_sectors || num_sectors > max_sectors) | |
1685 | num_sectors = max_sectors; | |
c3d9714e | 1686 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1687 | /* minor version 0 with bitmap we can't move */ |
1688 | return 0; | |
1689 | } else { | |
1690 | /* minor version 0; superblock after data */ | |
0f420358 | 1691 | sector_t sb_start; |
77304d2a | 1692 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1693 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1694 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1695 | if (!num_sectors || num_sectors > max_sectors) |
1696 | num_sectors = max_sectors; | |
0f420358 | 1697 | rdev->sb_start = sb_start; |
0cd17fec CW |
1698 | } |
1699 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1700 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1701 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1702 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1703 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1704 | rdev->sb_page); |
1705 | md_super_wait(rdev->mddev); | |
c26a44ed | 1706 | return num_sectors; |
0cd17fec | 1707 | } |
1da177e4 | 1708 | |
75c96f85 | 1709 | static struct super_type super_types[] = { |
1da177e4 LT |
1710 | [0] = { |
1711 | .name = "0.90.0", | |
1712 | .owner = THIS_MODULE, | |
0cd17fec CW |
1713 | .load_super = super_90_load, |
1714 | .validate_super = super_90_validate, | |
1715 | .sync_super = super_90_sync, | |
1716 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1717 | }, |
1718 | [1] = { | |
1719 | .name = "md-1", | |
1720 | .owner = THIS_MODULE, | |
0cd17fec CW |
1721 | .load_super = super_1_load, |
1722 | .validate_super = super_1_validate, | |
1723 | .sync_super = super_1_sync, | |
1724 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1725 | }, |
1726 | }; | |
1da177e4 LT |
1727 | |
1728 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1729 | { | |
7dd5e7c3 | 1730 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1731 | |
4b80991c N |
1732 | rcu_read_lock(); |
1733 | rdev_for_each_rcu(rdev, mddev1) | |
1734 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1735 | if (rdev->bdev->bd_contains == |
4b80991c N |
1736 | rdev2->bdev->bd_contains) { |
1737 | rcu_read_unlock(); | |
7dd5e7c3 | 1738 | return 1; |
4b80991c N |
1739 | } |
1740 | rcu_read_unlock(); | |
1da177e4 LT |
1741 | return 0; |
1742 | } | |
1743 | ||
1744 | static LIST_HEAD(pending_raid_disks); | |
1745 | ||
ac5e7113 AN |
1746 | /* |
1747 | * Try to register data integrity profile for an mddev | |
1748 | * | |
1749 | * This is called when an array is started and after a disk has been kicked | |
1750 | * from the array. It only succeeds if all working and active component devices | |
1751 | * are integrity capable with matching profiles. | |
1752 | */ | |
1753 | int md_integrity_register(mddev_t *mddev) | |
1754 | { | |
1755 | mdk_rdev_t *rdev, *reference = NULL; | |
1756 | ||
1757 | if (list_empty(&mddev->disks)) | |
1758 | return 0; /* nothing to do */ | |
1759 | if (blk_get_integrity(mddev->gendisk)) | |
1760 | return 0; /* already registered */ | |
1761 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1762 | /* skip spares and non-functional disks */ | |
1763 | if (test_bit(Faulty, &rdev->flags)) | |
1764 | continue; | |
1765 | if (rdev->raid_disk < 0) | |
1766 | continue; | |
1767 | /* | |
1768 | * If at least one rdev is not integrity capable, we can not | |
1769 | * enable data integrity for the md device. | |
1770 | */ | |
1771 | if (!bdev_get_integrity(rdev->bdev)) | |
1772 | return -EINVAL; | |
1773 | if (!reference) { | |
1774 | /* Use the first rdev as the reference */ | |
1775 | reference = rdev; | |
1776 | continue; | |
1777 | } | |
1778 | /* does this rdev's profile match the reference profile? */ | |
1779 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1780 | rdev->bdev->bd_disk) < 0) | |
1781 | return -EINVAL; | |
1782 | } | |
1783 | /* | |
1784 | * All component devices are integrity capable and have matching | |
1785 | * profiles, register the common profile for the md device. | |
1786 | */ | |
1787 | if (blk_integrity_register(mddev->gendisk, | |
1788 | bdev_get_integrity(reference->bdev)) != 0) { | |
1789 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1790 | mdname(mddev)); | |
1791 | return -EINVAL; | |
1792 | } | |
1793 | printk(KERN_NOTICE "md: data integrity on %s enabled\n", | |
1794 | mdname(mddev)); | |
1795 | return 0; | |
1796 | } | |
1797 | EXPORT_SYMBOL(md_integrity_register); | |
1798 | ||
1799 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1800 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1801 | { |
3f9d99c1 | 1802 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1803 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1804 | |
ac5e7113 | 1805 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1806 | return; |
ac5e7113 | 1807 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1808 | return; |
ac5e7113 AN |
1809 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1810 | rdev->bdev->bd_disk) >= 0) | |
1811 | return; | |
1812 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1813 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1814 | } |
ac5e7113 | 1815 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1816 | |
1da177e4 LT |
1817 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1818 | { | |
7dd5e7c3 | 1819 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1820 | struct kobject *ko; |
1edf80d3 | 1821 | char *s; |
5e55e2f5 | 1822 | int err; |
1da177e4 LT |
1823 | |
1824 | if (rdev->mddev) { | |
1825 | MD_BUG(); | |
1826 | return -EINVAL; | |
1827 | } | |
11e2ede0 DW |
1828 | |
1829 | /* prevent duplicates */ | |
1830 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1831 | return -EEXIST; | |
1832 | ||
dd8ac336 AN |
1833 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1834 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1835 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1836 | if (mddev->pers) { |
1837 | /* Cannot change size, so fail | |
1838 | * If mddev->level <= 0, then we don't care | |
1839 | * about aligning sizes (e.g. linear) | |
1840 | */ | |
1841 | if (mddev->level > 0) | |
1842 | return -ENOSPC; | |
1843 | } else | |
dd8ac336 | 1844 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1845 | } |
1da177e4 LT |
1846 | |
1847 | /* Verify rdev->desc_nr is unique. | |
1848 | * If it is -1, assign a free number, else | |
1849 | * check number is not in use | |
1850 | */ | |
1851 | if (rdev->desc_nr < 0) { | |
1852 | int choice = 0; | |
1853 | if (mddev->pers) choice = mddev->raid_disks; | |
1854 | while (find_rdev_nr(mddev, choice)) | |
1855 | choice++; | |
1856 | rdev->desc_nr = choice; | |
1857 | } else { | |
1858 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1859 | return -EBUSY; | |
1860 | } | |
de01dfad N |
1861 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1862 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1863 | mdname(mddev), mddev->max_disks); | |
1864 | return -EBUSY; | |
1865 | } | |
19133a42 | 1866 | bdevname(rdev->bdev,b); |
649316b2 | 1867 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1868 | *s = '!'; |
649316b2 | 1869 | |
1da177e4 | 1870 | rdev->mddev = mddev; |
19133a42 | 1871 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1872 | |
b2d6db58 | 1873 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1874 | goto fail; |
86e6ffdd | 1875 | |
0762b8bd | 1876 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
1877 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
1878 | /* failure here is OK */; | |
1879 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 1880 | |
4b80991c | 1881 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1882 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1883 | |
1884 | /* May as well allow recovery to be retried once */ | |
1885 | mddev->recovery_disabled = 0; | |
3f9d99c1 | 1886 | |
1da177e4 | 1887 | return 0; |
5e55e2f5 N |
1888 | |
1889 | fail: | |
1890 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1891 | b, mdname(mddev)); | |
1892 | return err; | |
1da177e4 LT |
1893 | } |
1894 | ||
177a99b2 | 1895 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1896 | { |
1897 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1898 | kobject_del(&rdev->kobj); | |
177a99b2 | 1899 | kobject_put(&rdev->kobj); |
5792a285 N |
1900 | } |
1901 | ||
1da177e4 LT |
1902 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1903 | { | |
1904 | char b[BDEVNAME_SIZE]; | |
1905 | if (!rdev->mddev) { | |
1906 | MD_BUG(); | |
1907 | return; | |
1908 | } | |
5463c790 | 1909 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1910 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1911 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1912 | rdev->mddev = NULL; | |
86e6ffdd | 1913 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1914 | sysfs_put(rdev->sysfs_state); |
1915 | rdev->sysfs_state = NULL; | |
5792a285 | 1916 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1917 | * writing to 'remove' to "dev/state". We also need |
1918 | * to delay it due to rcu usage. | |
5792a285 | 1919 | */ |
4b80991c | 1920 | synchronize_rcu(); |
177a99b2 N |
1921 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1922 | kobject_get(&rdev->kobj); | |
e804ac78 | 1923 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
1924 | } |
1925 | ||
1926 | /* | |
1927 | * prevent the device from being mounted, repartitioned or | |
1928 | * otherwise reused by a RAID array (or any other kernel | |
1929 | * subsystem), by bd_claiming the device. | |
1930 | */ | |
c5d79adb | 1931 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1932 | { |
1933 | int err = 0; | |
1934 | struct block_device *bdev; | |
1935 | char b[BDEVNAME_SIZE]; | |
1936 | ||
2e7b651d | 1937 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1938 | if (IS_ERR(bdev)) { |
1939 | printk(KERN_ERR "md: could not open %s.\n", | |
1940 | __bdevname(dev, b)); | |
1941 | return PTR_ERR(bdev); | |
1942 | } | |
c5d79adb | 1943 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1944 | if (err) { |
1945 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1946 | bdevname(bdev, b)); | |
9a1c3542 | 1947 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1948 | return err; |
1949 | } | |
c5d79adb N |
1950 | if (!shared) |
1951 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1952 | rdev->bdev = bdev; |
1953 | return err; | |
1954 | } | |
1955 | ||
1956 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1957 | { | |
1958 | struct block_device *bdev = rdev->bdev; | |
1959 | rdev->bdev = NULL; | |
1960 | if (!bdev) | |
1961 | MD_BUG(); | |
1962 | bd_release(bdev); | |
9a1c3542 | 1963 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1964 | } |
1965 | ||
1966 | void md_autodetect_dev(dev_t dev); | |
1967 | ||
1968 | static void export_rdev(mdk_rdev_t * rdev) | |
1969 | { | |
1970 | char b[BDEVNAME_SIZE]; | |
1971 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1972 | bdevname(rdev->bdev,b)); | |
1973 | if (rdev->mddev) | |
1974 | MD_BUG(); | |
1975 | free_disk_sb(rdev); | |
1da177e4 | 1976 | #ifndef MODULE |
d0fae18f N |
1977 | if (test_bit(AutoDetected, &rdev->flags)) |
1978 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1979 | #endif |
1980 | unlock_rdev(rdev); | |
86e6ffdd | 1981 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1982 | } |
1983 | ||
1984 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1985 | { | |
1986 | unbind_rdev_from_array(rdev); | |
1987 | export_rdev(rdev); | |
1988 | } | |
1989 | ||
1990 | static void export_array(mddev_t *mddev) | |
1991 | { | |
159ec1fc | 1992 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1993 | |
d089c6af | 1994 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1995 | if (!rdev->mddev) { |
1996 | MD_BUG(); | |
1997 | continue; | |
1998 | } | |
1999 | kick_rdev_from_array(rdev); | |
2000 | } | |
2001 | if (!list_empty(&mddev->disks)) | |
2002 | MD_BUG(); | |
2003 | mddev->raid_disks = 0; | |
2004 | mddev->major_version = 0; | |
2005 | } | |
2006 | ||
2007 | static void print_desc(mdp_disk_t *desc) | |
2008 | { | |
2009 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2010 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2011 | } | |
2012 | ||
cd2ac932 | 2013 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2014 | { |
2015 | int i; | |
2016 | ||
2017 | printk(KERN_INFO | |
2018 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2019 | sb->major_version, sb->minor_version, sb->patch_version, | |
2020 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2021 | sb->ctime); | |
2022 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2023 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2024 | sb->md_minor, sb->layout, sb->chunk_size); | |
2025 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2026 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2027 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2028 | sb->failed_disks, sb->spare_disks, | |
2029 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2030 | ||
2031 | printk(KERN_INFO); | |
2032 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2033 | mdp_disk_t *desc; | |
2034 | ||
2035 | desc = sb->disks + i; | |
2036 | if (desc->number || desc->major || desc->minor || | |
2037 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2038 | printk(" D %2d: ", i); | |
2039 | print_desc(desc); | |
2040 | } | |
2041 | } | |
2042 | printk(KERN_INFO "md: THIS: "); | |
2043 | print_desc(&sb->this_disk); | |
cd2ac932 | 2044 | } |
1da177e4 | 2045 | |
cd2ac932 CR |
2046 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2047 | { | |
2048 | __u8 *uuid; | |
2049 | ||
2050 | uuid = sb->set_uuid; | |
ad361c98 | 2051 | printk(KERN_INFO |
7b75c2f8 | 2052 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2053 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2054 | le32_to_cpu(sb->major_version), |
2055 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2056 | uuid, |
cd2ac932 CR |
2057 | sb->set_name, |
2058 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2059 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2060 | ||
2061 | uuid = sb->device_uuid; | |
ad361c98 JP |
2062 | printk(KERN_INFO |
2063 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2064 | " RO:%llu\n" |
7b75c2f8 | 2065 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2066 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2067 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2068 | le32_to_cpu(sb->level), |
2069 | (unsigned long long)le64_to_cpu(sb->size), | |
2070 | le32_to_cpu(sb->raid_disks), | |
2071 | le32_to_cpu(sb->layout), | |
2072 | le32_to_cpu(sb->chunksize), | |
2073 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2074 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2075 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2076 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2077 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2078 | uuid, |
cd2ac932 CR |
2079 | sb->devflags, |
2080 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2081 | (unsigned long long)le64_to_cpu(sb->events), | |
2082 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2083 | le32_to_cpu(sb->sb_csum), | |
2084 | le32_to_cpu(sb->max_dev) | |
2085 | ); | |
1da177e4 LT |
2086 | } |
2087 | ||
cd2ac932 | 2088 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2089 | { |
2090 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2091 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2092 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2093 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2094 | rdev->desc_nr); | |
1da177e4 | 2095 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2096 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2097 | switch (major_version) { | |
2098 | case 0: | |
2099 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
2100 | break; | |
2101 | case 1: | |
2102 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
2103 | break; | |
2104 | } | |
1da177e4 LT |
2105 | } else |
2106 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2107 | } | |
2108 | ||
5e56341d | 2109 | static void md_print_devices(void) |
1da177e4 | 2110 | { |
159ec1fc | 2111 | struct list_head *tmp; |
1da177e4 LT |
2112 | mdk_rdev_t *rdev; |
2113 | mddev_t *mddev; | |
2114 | char b[BDEVNAME_SIZE]; | |
2115 | ||
2116 | printk("\n"); | |
2117 | printk("md: **********************************\n"); | |
2118 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2119 | printk("md: **********************************\n"); | |
29ac4aa3 | 2120 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2121 | |
32a7627c N |
2122 | if (mddev->bitmap) |
2123 | bitmap_print_sb(mddev->bitmap); | |
2124 | else | |
2125 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2126 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2127 | printk("<%s>", bdevname(rdev->bdev,b)); |
2128 | printk("\n"); | |
2129 | ||
159ec1fc | 2130 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2131 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2132 | } |
2133 | printk("md: **********************************\n"); | |
2134 | printk("\n"); | |
2135 | } | |
2136 | ||
2137 | ||
42543769 | 2138 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2139 | { |
42543769 N |
2140 | /* Update each superblock (in-memory image), but |
2141 | * if we are allowed to, skip spares which already | |
2142 | * have the right event counter, or have one earlier | |
2143 | * (which would mean they aren't being marked as dirty | |
2144 | * with the rest of the array) | |
2145 | */ | |
1da177e4 | 2146 | mdk_rdev_t *rdev; |
159ec1fc | 2147 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2148 | if (rdev->sb_events == mddev->events || |
2149 | (nospares && | |
2150 | rdev->raid_disk < 0 && | |
42543769 N |
2151 | rdev->sb_events+1 == mddev->events)) { |
2152 | /* Don't update this superblock */ | |
2153 | rdev->sb_loaded = 2; | |
2154 | } else { | |
2155 | super_types[mddev->major_version]. | |
2156 | sync_super(mddev, rdev); | |
2157 | rdev->sb_loaded = 1; | |
2158 | } | |
1da177e4 LT |
2159 | } |
2160 | } | |
2161 | ||
850b2b42 | 2162 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2163 | { |
1da177e4 | 2164 | mdk_rdev_t *rdev; |
06d91a5f | 2165 | int sync_req; |
42543769 | 2166 | int nospares = 0; |
1da177e4 | 2167 | |
1da177e4 | 2168 | repeat: |
3a3a5ddb N |
2169 | /* First make sure individual recovery_offsets are correct */ |
2170 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2171 | if (rdev->raid_disk >= 0 && | |
2172 | mddev->delta_disks >= 0 && | |
2173 | !test_bit(In_sync, &rdev->flags) && | |
2174 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2175 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2176 | ||
2177 | } | |
bd52b746 | 2178 | if (!mddev->persistent) { |
070dc6dd | 2179 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2180 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
d97a41dc N |
2181 | if (!mddev->external) |
2182 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3a3a5ddb N |
2183 | wake_up(&mddev->sb_wait); |
2184 | return; | |
2185 | } | |
2186 | ||
a9701a30 | 2187 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2188 | |
3a3a5ddb N |
2189 | mddev->utime = get_seconds(); |
2190 | ||
850b2b42 N |
2191 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2192 | force_change = 1; | |
2193 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2194 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2195 | * though if events isn't the right even/odd, we will have to do | |
2196 | * spares after all | |
2197 | */ | |
2198 | nospares = 1; | |
2199 | if (force_change) | |
2200 | nospares = 0; | |
2201 | if (mddev->degraded) | |
84692195 N |
2202 | /* If the array is degraded, then skipping spares is both |
2203 | * dangerous and fairly pointless. | |
2204 | * Dangerous because a device that was removed from the array | |
2205 | * might have a event_count that still looks up-to-date, | |
2206 | * so it can be re-added without a resync. | |
2207 | * Pointless because if there are any spares to skip, | |
2208 | * then a recovery will happen and soon that array won't | |
2209 | * be degraded any more and the spare can go back to sleep then. | |
2210 | */ | |
850b2b42 | 2211 | nospares = 0; |
84692195 | 2212 | |
06d91a5f | 2213 | sync_req = mddev->in_sync; |
42543769 N |
2214 | |
2215 | /* If this is just a dirty<->clean transition, and the array is clean | |
2216 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2217 | if (nospares |
42543769 | 2218 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2219 | && mddev->can_decrease_events |
2220 | && mddev->events != 1) { | |
42543769 | 2221 | mddev->events--; |
a8707c08 N |
2222 | mddev->can_decrease_events = 0; |
2223 | } else { | |
42543769 N |
2224 | /* otherwise we have to go forward and ... */ |
2225 | mddev->events ++; | |
a8707c08 | 2226 | mddev->can_decrease_events = nospares; |
42543769 | 2227 | } |
1da177e4 LT |
2228 | |
2229 | if (!mddev->events) { | |
2230 | /* | |
2231 | * oops, this 64-bit counter should never wrap. | |
2232 | * Either we are in around ~1 trillion A.C., assuming | |
2233 | * 1 reboot per second, or we have a bug: | |
2234 | */ | |
2235 | MD_BUG(); | |
2236 | mddev->events --; | |
2237 | } | |
e691063a | 2238 | sync_sbs(mddev, nospares); |
a9701a30 | 2239 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2240 | |
2241 | dprintk(KERN_INFO | |
2242 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2243 | mdname(mddev),mddev->in_sync); | |
2244 | ||
4ad13663 | 2245 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2246 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2247 | char b[BDEVNAME_SIZE]; |
2248 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2249 | if (rdev->sb_loaded != 1) |
2250 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2251 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2252 | dprintk("(skipping faulty "); |
2253 | ||
2254 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2255 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2256 | md_super_write(mddev,rdev, |
0f420358 | 2257 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2258 | rdev->sb_page); |
2259 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2260 | bdevname(rdev->bdev,b), | |
0f420358 | 2261 | (unsigned long long)rdev->sb_start); |
42543769 | 2262 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2263 | |
1da177e4 LT |
2264 | } else |
2265 | dprintk(")\n"); | |
7bfa19f2 | 2266 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2267 | /* only need to write one superblock... */ |
2268 | break; | |
2269 | } | |
a9701a30 | 2270 | md_super_wait(mddev); |
850b2b42 | 2271 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2272 | |
a9701a30 | 2273 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2274 | if (mddev->in_sync != sync_req || |
2275 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2276 | /* have to write it out again */ |
a9701a30 | 2277 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2278 | goto repeat; |
2279 | } | |
850b2b42 | 2280 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2281 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2282 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2283 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2284 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2285 | |
1da177e4 LT |
2286 | } |
2287 | ||
7f6ce769 | 2288 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2289 | * We want to accept with case. For this we use cmd_match. |
2290 | */ | |
2291 | static int cmd_match(const char *cmd, const char *str) | |
2292 | { | |
2293 | /* See if cmd, written into a sysfs file, matches | |
2294 | * str. They must either be the same, or cmd can | |
2295 | * have a trailing newline | |
2296 | */ | |
2297 | while (*cmd && *str && *cmd == *str) { | |
2298 | cmd++; | |
2299 | str++; | |
2300 | } | |
2301 | if (*cmd == '\n') | |
2302 | cmd++; | |
2303 | if (*str || *cmd) | |
2304 | return 0; | |
2305 | return 1; | |
2306 | } | |
2307 | ||
86e6ffdd N |
2308 | struct rdev_sysfs_entry { |
2309 | struct attribute attr; | |
2310 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2311 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2312 | }; | |
2313 | ||
2314 | static ssize_t | |
96de1e66 | 2315 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2316 | { |
2317 | char *sep = ""; | |
20a49ff6 | 2318 | size_t len = 0; |
86e6ffdd | 2319 | |
b2d444d7 | 2320 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2321 | len+= sprintf(page+len, "%sfaulty",sep); |
2322 | sep = ","; | |
2323 | } | |
b2d444d7 | 2324 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2325 | len += sprintf(page+len, "%sin_sync",sep); |
2326 | sep = ","; | |
2327 | } | |
f655675b N |
2328 | if (test_bit(WriteMostly, &rdev->flags)) { |
2329 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2330 | sep = ","; | |
2331 | } | |
6bfe0b49 DW |
2332 | if (test_bit(Blocked, &rdev->flags)) { |
2333 | len += sprintf(page+len, "%sblocked", sep); | |
2334 | sep = ","; | |
2335 | } | |
b2d444d7 N |
2336 | if (!test_bit(Faulty, &rdev->flags) && |
2337 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2338 | len += sprintf(page+len, "%sspare", sep); |
2339 | sep = ","; | |
2340 | } | |
2341 | return len+sprintf(page+len, "\n"); | |
2342 | } | |
2343 | ||
45dc2de1 N |
2344 | static ssize_t |
2345 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2346 | { | |
2347 | /* can write | |
2348 | * faulty - simulates and error | |
2349 | * remove - disconnects the device | |
f655675b N |
2350 | * writemostly - sets write_mostly |
2351 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2352 | * blocked - sets the Blocked flag |
2353 | * -blocked - clears the Blocked flag | |
6d56e278 | 2354 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2355 | */ |
2356 | int err = -EINVAL; | |
2357 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2358 | md_error(rdev->mddev, rdev); | |
2359 | err = 0; | |
2360 | } else if (cmd_match(buf, "remove")) { | |
2361 | if (rdev->raid_disk >= 0) | |
2362 | err = -EBUSY; | |
2363 | else { | |
2364 | mddev_t *mddev = rdev->mddev; | |
2365 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2366 | if (mddev->pers) |
2367 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2368 | md_new_event(mddev); |
2369 | err = 0; | |
2370 | } | |
f655675b N |
2371 | } else if (cmd_match(buf, "writemostly")) { |
2372 | set_bit(WriteMostly, &rdev->flags); | |
2373 | err = 0; | |
2374 | } else if (cmd_match(buf, "-writemostly")) { | |
2375 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2376 | err = 0; |
2377 | } else if (cmd_match(buf, "blocked")) { | |
2378 | set_bit(Blocked, &rdev->flags); | |
2379 | err = 0; | |
2380 | } else if (cmd_match(buf, "-blocked")) { | |
2381 | clear_bit(Blocked, &rdev->flags); | |
2382 | wake_up(&rdev->blocked_wait); | |
2383 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2384 | md_wakeup_thread(rdev->mddev->thread); | |
2385 | ||
6d56e278 N |
2386 | err = 0; |
2387 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2388 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2389 | err = 0; |
45dc2de1 | 2390 | } |
00bcb4ac N |
2391 | if (!err) |
2392 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2393 | return err ? err : len; |
2394 | } | |
80ca3a44 N |
2395 | static struct rdev_sysfs_entry rdev_state = |
2396 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2397 | |
4dbcdc75 N |
2398 | static ssize_t |
2399 | errors_show(mdk_rdev_t *rdev, char *page) | |
2400 | { | |
2401 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2402 | } | |
2403 | ||
2404 | static ssize_t | |
2405 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2406 | { | |
2407 | char *e; | |
2408 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2409 | if (*buf && (*e == 0 || *e == '\n')) { | |
2410 | atomic_set(&rdev->corrected_errors, n); | |
2411 | return len; | |
2412 | } | |
2413 | return -EINVAL; | |
2414 | } | |
2415 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2416 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2417 | |
014236d2 N |
2418 | static ssize_t |
2419 | slot_show(mdk_rdev_t *rdev, char *page) | |
2420 | { | |
2421 | if (rdev->raid_disk < 0) | |
2422 | return sprintf(page, "none\n"); | |
2423 | else | |
2424 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2425 | } | |
2426 | ||
2427 | static ssize_t | |
2428 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2429 | { | |
2430 | char *e; | |
c303da6d N |
2431 | int err; |
2432 | char nm[20]; | |
014236d2 N |
2433 | int slot = simple_strtoul(buf, &e, 10); |
2434 | if (strncmp(buf, "none", 4)==0) | |
2435 | slot = -1; | |
2436 | else if (e==buf || (*e && *e!= '\n')) | |
2437 | return -EINVAL; | |
6c2fce2e | 2438 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2439 | /* Setting 'slot' on an active array requires also |
2440 | * updating the 'rd%d' link, and communicating | |
2441 | * with the personality with ->hot_*_disk. | |
2442 | * For now we only support removing | |
2443 | * failed/spare devices. This normally happens automatically, | |
2444 | * but not when the metadata is externally managed. | |
2445 | */ | |
c303da6d N |
2446 | if (rdev->raid_disk == -1) |
2447 | return -EEXIST; | |
2448 | /* personality does all needed checks */ | |
2449 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2450 | return -EINVAL; | |
2451 | err = rdev->mddev->pers-> | |
2452 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2453 | if (err) | |
2454 | return err; | |
2455 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2456 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
b7103107 | 2457 | rdev->raid_disk = -1; |
c303da6d N |
2458 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2459 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2460 | } else if (rdev->mddev->pers) { |
2461 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2462 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2463 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2464 | */ |
2465 | ||
2466 | if (rdev->raid_disk != -1) | |
2467 | return -EBUSY; | |
2468 | ||
2469 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2470 | return -EINVAL; | |
2471 | ||
159ec1fc | 2472 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2473 | if (rdev2->raid_disk == slot) |
2474 | return -EEXIST; | |
2475 | ||
2476 | rdev->raid_disk = slot; | |
2477 | if (test_bit(In_sync, &rdev->flags)) | |
2478 | rdev->saved_raid_disk = slot; | |
2479 | else | |
2480 | rdev->saved_raid_disk = -1; | |
2481 | err = rdev->mddev->pers-> | |
2482 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2483 | if (err) { |
6c2fce2e | 2484 | rdev->raid_disk = -1; |
6c2fce2e | 2485 | return err; |
52664732 | 2486 | } else |
00bcb4ac | 2487 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6c2fce2e NB |
2488 | sprintf(nm, "rd%d", rdev->raid_disk); |
2489 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
00bcb4ac | 2490 | /* failure here is OK */; |
6c2fce2e | 2491 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d N |
2492 | } else { |
2493 | if (slot >= rdev->mddev->raid_disks) | |
2494 | return -ENOSPC; | |
2495 | rdev->raid_disk = slot; | |
2496 | /* assume it is working */ | |
c5d79adb N |
2497 | clear_bit(Faulty, &rdev->flags); |
2498 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2499 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2500 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2501 | } |
014236d2 N |
2502 | return len; |
2503 | } | |
2504 | ||
2505 | ||
2506 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2507 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2508 | |
93c8cad0 N |
2509 | static ssize_t |
2510 | offset_show(mdk_rdev_t *rdev, char *page) | |
2511 | { | |
6961ece4 | 2512 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2513 | } |
2514 | ||
2515 | static ssize_t | |
2516 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2517 | { | |
2518 | char *e; | |
2519 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2520 | if (e==buf || (*e && *e != '\n')) | |
2521 | return -EINVAL; | |
8ed0a521 | 2522 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2523 | return -EBUSY; |
dd8ac336 | 2524 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2525 | /* Must set offset before size, so overlap checks |
2526 | * can be sane */ | |
2527 | return -EBUSY; | |
93c8cad0 N |
2528 | rdev->data_offset = offset; |
2529 | return len; | |
2530 | } | |
2531 | ||
2532 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2533 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2534 | |
83303b61 N |
2535 | static ssize_t |
2536 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2537 | { | |
dd8ac336 | 2538 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2539 | } |
2540 | ||
c5d79adb N |
2541 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2542 | { | |
2543 | /* check if two start/length pairs overlap */ | |
2544 | if (s1+l1 <= s2) | |
2545 | return 0; | |
2546 | if (s2+l2 <= s1) | |
2547 | return 0; | |
2548 | return 1; | |
2549 | } | |
2550 | ||
b522adcd DW |
2551 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2552 | { | |
2553 | unsigned long long blocks; | |
2554 | sector_t new; | |
2555 | ||
2556 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2557 | return -EINVAL; | |
2558 | ||
2559 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2560 | return -EINVAL; /* sector conversion overflow */ | |
2561 | ||
2562 | new = blocks * 2; | |
2563 | if (new != blocks * 2) | |
2564 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2565 | ||
2566 | *sectors = new; | |
2567 | return 0; | |
2568 | } | |
2569 | ||
83303b61 N |
2570 | static ssize_t |
2571 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2572 | { | |
27c529bb | 2573 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2574 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2575 | sector_t sectors; |
27c529bb | 2576 | |
b522adcd | 2577 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2578 | return -EINVAL; |
0cd17fec | 2579 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2580 | if (my_mddev->persistent) { |
dd8ac336 AN |
2581 | sectors = super_types[my_mddev->major_version]. |
2582 | rdev_size_change(rdev, sectors); | |
2583 | if (!sectors) | |
0cd17fec | 2584 | return -EBUSY; |
dd8ac336 | 2585 | } else if (!sectors) |
77304d2a | 2586 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2587 | rdev->data_offset; |
0cd17fec | 2588 | } |
dd8ac336 | 2589 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2590 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2591 | |
dd8ac336 AN |
2592 | rdev->sectors = sectors; |
2593 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2594 | /* need to check that all other rdevs with the same ->bdev |
2595 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2596 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2597 | * we have to change it back, we will have the lock again. |
2598 | */ | |
2599 | mddev_t *mddev; | |
2600 | int overlap = 0; | |
159ec1fc | 2601 | struct list_head *tmp; |
c5d79adb | 2602 | |
27c529bb | 2603 | mddev_unlock(my_mddev); |
29ac4aa3 | 2604 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2605 | mdk_rdev_t *rdev2; |
2606 | ||
2607 | mddev_lock(mddev); | |
159ec1fc | 2608 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2609 | if (test_bit(AllReserved, &rdev2->flags) || |
2610 | (rdev->bdev == rdev2->bdev && | |
2611 | rdev != rdev2 && | |
dd8ac336 | 2612 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2613 | rdev2->data_offset, |
dd8ac336 | 2614 | rdev2->sectors))) { |
c5d79adb N |
2615 | overlap = 1; |
2616 | break; | |
2617 | } | |
2618 | mddev_unlock(mddev); | |
2619 | if (overlap) { | |
2620 | mddev_put(mddev); | |
2621 | break; | |
2622 | } | |
2623 | } | |
27c529bb | 2624 | mddev_lock(my_mddev); |
c5d79adb N |
2625 | if (overlap) { |
2626 | /* Someone else could have slipped in a size | |
2627 | * change here, but doing so is just silly. | |
dd8ac336 | 2628 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2629 | * safe, and trust userspace not to race with |
2630 | * itself | |
2631 | */ | |
dd8ac336 | 2632 | rdev->sectors = oldsectors; |
c5d79adb N |
2633 | return -EBUSY; |
2634 | } | |
2635 | } | |
83303b61 N |
2636 | return len; |
2637 | } | |
2638 | ||
2639 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2640 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2641 | |
06e3c817 DW |
2642 | |
2643 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2644 | { | |
2645 | unsigned long long recovery_start = rdev->recovery_offset; | |
2646 | ||
2647 | if (test_bit(In_sync, &rdev->flags) || | |
2648 | recovery_start == MaxSector) | |
2649 | return sprintf(page, "none\n"); | |
2650 | ||
2651 | return sprintf(page, "%llu\n", recovery_start); | |
2652 | } | |
2653 | ||
2654 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2655 | { | |
2656 | unsigned long long recovery_start; | |
2657 | ||
2658 | if (cmd_match(buf, "none")) | |
2659 | recovery_start = MaxSector; | |
2660 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2661 | return -EINVAL; | |
2662 | ||
2663 | if (rdev->mddev->pers && | |
2664 | rdev->raid_disk >= 0) | |
2665 | return -EBUSY; | |
2666 | ||
2667 | rdev->recovery_offset = recovery_start; | |
2668 | if (recovery_start == MaxSector) | |
2669 | set_bit(In_sync, &rdev->flags); | |
2670 | else | |
2671 | clear_bit(In_sync, &rdev->flags); | |
2672 | return len; | |
2673 | } | |
2674 | ||
2675 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2676 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2677 | ||
86e6ffdd N |
2678 | static struct attribute *rdev_default_attrs[] = { |
2679 | &rdev_state.attr, | |
4dbcdc75 | 2680 | &rdev_errors.attr, |
014236d2 | 2681 | &rdev_slot.attr, |
93c8cad0 | 2682 | &rdev_offset.attr, |
83303b61 | 2683 | &rdev_size.attr, |
06e3c817 | 2684 | &rdev_recovery_start.attr, |
86e6ffdd N |
2685 | NULL, |
2686 | }; | |
2687 | static ssize_t | |
2688 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2689 | { | |
2690 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2691 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2692 | mddev_t *mddev = rdev->mddev; |
2693 | ssize_t rv; | |
86e6ffdd N |
2694 | |
2695 | if (!entry->show) | |
2696 | return -EIO; | |
27c529bb N |
2697 | |
2698 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2699 | if (!rv) { | |
2700 | if (rdev->mddev == NULL) | |
2701 | rv = -EBUSY; | |
2702 | else | |
2703 | rv = entry->show(rdev, page); | |
2704 | mddev_unlock(mddev); | |
2705 | } | |
2706 | return rv; | |
86e6ffdd N |
2707 | } |
2708 | ||
2709 | static ssize_t | |
2710 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2711 | const char *page, size_t length) | |
2712 | { | |
2713 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2714 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2715 | ssize_t rv; |
2716 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2717 | |
2718 | if (!entry->store) | |
2719 | return -EIO; | |
67463acb N |
2720 | if (!capable(CAP_SYS_ADMIN)) |
2721 | return -EACCES; | |
27c529bb | 2722 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2723 | if (!rv) { |
27c529bb N |
2724 | if (rdev->mddev == NULL) |
2725 | rv = -EBUSY; | |
2726 | else | |
2727 | rv = entry->store(rdev, page, length); | |
6a51830e | 2728 | mddev_unlock(mddev); |
ca388059 N |
2729 | } |
2730 | return rv; | |
86e6ffdd N |
2731 | } |
2732 | ||
2733 | static void rdev_free(struct kobject *ko) | |
2734 | { | |
2735 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2736 | kfree(rdev); | |
2737 | } | |
52cf25d0 | 2738 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2739 | .show = rdev_attr_show, |
2740 | .store = rdev_attr_store, | |
2741 | }; | |
2742 | static struct kobj_type rdev_ktype = { | |
2743 | .release = rdev_free, | |
2744 | .sysfs_ops = &rdev_sysfs_ops, | |
2745 | .default_attrs = rdev_default_attrs, | |
2746 | }; | |
2747 | ||
e8bb9a83 N |
2748 | void md_rdev_init(mdk_rdev_t *rdev) |
2749 | { | |
2750 | rdev->desc_nr = -1; | |
2751 | rdev->saved_raid_disk = -1; | |
2752 | rdev->raid_disk = -1; | |
2753 | rdev->flags = 0; | |
2754 | rdev->data_offset = 0; | |
2755 | rdev->sb_events = 0; | |
2756 | rdev->last_read_error.tv_sec = 0; | |
2757 | rdev->last_read_error.tv_nsec = 0; | |
2758 | atomic_set(&rdev->nr_pending, 0); | |
2759 | atomic_set(&rdev->read_errors, 0); | |
2760 | atomic_set(&rdev->corrected_errors, 0); | |
2761 | ||
2762 | INIT_LIST_HEAD(&rdev->same_set); | |
2763 | init_waitqueue_head(&rdev->blocked_wait); | |
2764 | } | |
2765 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
2766 | /* |
2767 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2768 | * | |
2769 | * mark the device faulty if: | |
2770 | * | |
2771 | * - the device is nonexistent (zero size) | |
2772 | * - the device has no valid superblock | |
2773 | * | |
2774 | * a faulty rdev _never_ has rdev->sb set. | |
2775 | */ | |
2776 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2777 | { | |
2778 | char b[BDEVNAME_SIZE]; | |
2779 | int err; | |
2780 | mdk_rdev_t *rdev; | |
2781 | sector_t size; | |
2782 | ||
9ffae0cf | 2783 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2784 | if (!rdev) { |
2785 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2786 | return ERR_PTR(-ENOMEM); | |
2787 | } | |
1da177e4 | 2788 | |
e8bb9a83 | 2789 | md_rdev_init(rdev); |
1da177e4 LT |
2790 | if ((err = alloc_disk_sb(rdev))) |
2791 | goto abort_free; | |
2792 | ||
c5d79adb | 2793 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2794 | if (err) |
2795 | goto abort_free; | |
2796 | ||
f9cb074b | 2797 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2798 | |
77304d2a | 2799 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
2800 | if (!size) { |
2801 | printk(KERN_WARNING | |
2802 | "md: %s has zero or unknown size, marking faulty!\n", | |
2803 | bdevname(rdev->bdev,b)); | |
2804 | err = -EINVAL; | |
2805 | goto abort_free; | |
2806 | } | |
2807 | ||
2808 | if (super_format >= 0) { | |
2809 | err = super_types[super_format]. | |
2810 | load_super(rdev, NULL, super_minor); | |
2811 | if (err == -EINVAL) { | |
df968c4e N |
2812 | printk(KERN_WARNING |
2813 | "md: %s does not have a valid v%d.%d " | |
2814 | "superblock, not importing!\n", | |
2815 | bdevname(rdev->bdev,b), | |
2816 | super_format, super_minor); | |
1da177e4 LT |
2817 | goto abort_free; |
2818 | } | |
2819 | if (err < 0) { | |
2820 | printk(KERN_WARNING | |
2821 | "md: could not read %s's sb, not importing!\n", | |
2822 | bdevname(rdev->bdev,b)); | |
2823 | goto abort_free; | |
2824 | } | |
2825 | } | |
6bfe0b49 | 2826 | |
1da177e4 LT |
2827 | return rdev; |
2828 | ||
2829 | abort_free: | |
2830 | if (rdev->sb_page) { | |
2831 | if (rdev->bdev) | |
2832 | unlock_rdev(rdev); | |
2833 | free_disk_sb(rdev); | |
2834 | } | |
2835 | kfree(rdev); | |
2836 | return ERR_PTR(err); | |
2837 | } | |
2838 | ||
2839 | /* | |
2840 | * Check a full RAID array for plausibility | |
2841 | */ | |
2842 | ||
2843 | ||
a757e64c | 2844 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2845 | { |
2846 | int i; | |
159ec1fc | 2847 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2848 | char b[BDEVNAME_SIZE]; |
2849 | ||
2850 | freshest = NULL; | |
d089c6af | 2851 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2852 | switch (super_types[mddev->major_version]. |
2853 | load_super(rdev, freshest, mddev->minor_version)) { | |
2854 | case 1: | |
2855 | freshest = rdev; | |
2856 | break; | |
2857 | case 0: | |
2858 | break; | |
2859 | default: | |
2860 | printk( KERN_ERR \ | |
2861 | "md: fatal superblock inconsistency in %s" | |
2862 | " -- removing from array\n", | |
2863 | bdevname(rdev->bdev,b)); | |
2864 | kick_rdev_from_array(rdev); | |
2865 | } | |
2866 | ||
2867 | ||
2868 | super_types[mddev->major_version]. | |
2869 | validate_super(mddev, freshest); | |
2870 | ||
2871 | i = 0; | |
d089c6af | 2872 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
2873 | if (mddev->max_disks && |
2874 | (rdev->desc_nr >= mddev->max_disks || | |
2875 | i > mddev->max_disks)) { | |
de01dfad N |
2876 | printk(KERN_WARNING |
2877 | "md: %s: %s: only %d devices permitted\n", | |
2878 | mdname(mddev), bdevname(rdev->bdev, b), | |
2879 | mddev->max_disks); | |
2880 | kick_rdev_from_array(rdev); | |
2881 | continue; | |
2882 | } | |
1da177e4 LT |
2883 | if (rdev != freshest) |
2884 | if (super_types[mddev->major_version]. | |
2885 | validate_super(mddev, rdev)) { | |
2886 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2887 | " from array!\n", | |
2888 | bdevname(rdev->bdev,b)); | |
2889 | kick_rdev_from_array(rdev); | |
2890 | continue; | |
2891 | } | |
2892 | if (mddev->level == LEVEL_MULTIPATH) { | |
2893 | rdev->desc_nr = i++; | |
2894 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2895 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2896 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2897 | rdev->raid_disk = -1; |
2898 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2899 | } |
2900 | } | |
1da177e4 LT |
2901 | } |
2902 | ||
72e02075 N |
2903 | /* Read a fixed-point number. |
2904 | * Numbers in sysfs attributes should be in "standard" units where | |
2905 | * possible, so time should be in seconds. | |
2906 | * However we internally use a a much smaller unit such as | |
2907 | * milliseconds or jiffies. | |
2908 | * This function takes a decimal number with a possible fractional | |
2909 | * component, and produces an integer which is the result of | |
2910 | * multiplying that number by 10^'scale'. | |
2911 | * all without any floating-point arithmetic. | |
2912 | */ | |
2913 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2914 | { | |
2915 | unsigned long result = 0; | |
2916 | long decimals = -1; | |
2917 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
2918 | if (*cp == '.') | |
2919 | decimals = 0; | |
2920 | else if (decimals < scale) { | |
2921 | unsigned int value; | |
2922 | value = *cp - '0'; | |
2923 | result = result * 10 + value; | |
2924 | if (decimals >= 0) | |
2925 | decimals++; | |
2926 | } | |
2927 | cp++; | |
2928 | } | |
2929 | if (*cp == '\n') | |
2930 | cp++; | |
2931 | if (*cp) | |
2932 | return -EINVAL; | |
2933 | if (decimals < 0) | |
2934 | decimals = 0; | |
2935 | while (decimals < scale) { | |
2936 | result *= 10; | |
2937 | decimals ++; | |
2938 | } | |
2939 | *res = result; | |
2940 | return 0; | |
2941 | } | |
2942 | ||
2943 | ||
19052c0e N |
2944 | static void md_safemode_timeout(unsigned long data); |
2945 | ||
16f17b39 N |
2946 | static ssize_t |
2947 | safe_delay_show(mddev_t *mddev, char *page) | |
2948 | { | |
2949 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2950 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2951 | } | |
2952 | static ssize_t | |
2953 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2954 | { | |
16f17b39 | 2955 | unsigned long msec; |
97ce0a7f | 2956 | |
72e02075 | 2957 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 2958 | return -EINVAL; |
16f17b39 N |
2959 | if (msec == 0) |
2960 | mddev->safemode_delay = 0; | |
2961 | else { | |
19052c0e | 2962 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2963 | mddev->safemode_delay = (msec*HZ)/1000; |
2964 | if (mddev->safemode_delay == 0) | |
2965 | mddev->safemode_delay = 1; | |
19052c0e N |
2966 | if (mddev->safemode_delay < old_delay) |
2967 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2968 | } |
2969 | return len; | |
2970 | } | |
2971 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2972 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2973 | |
eae1701f | 2974 | static ssize_t |
96de1e66 | 2975 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2976 | { |
2604b703 | 2977 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2978 | if (p) |
eae1701f | 2979 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2980 | else if (mddev->clevel[0]) |
2981 | return sprintf(page, "%s\n", mddev->clevel); | |
2982 | else if (mddev->level != LEVEL_NONE) | |
2983 | return sprintf(page, "%d\n", mddev->level); | |
2984 | else | |
2985 | return 0; | |
eae1701f N |
2986 | } |
2987 | ||
d9d166c2 N |
2988 | static ssize_t |
2989 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2990 | { | |
f2859af6 | 2991 | char clevel[16]; |
20a49ff6 | 2992 | ssize_t rv = len; |
245f46c2 | 2993 | struct mdk_personality *pers; |
f2859af6 | 2994 | long level; |
245f46c2 | 2995 | void *priv; |
3a981b03 | 2996 | mdk_rdev_t *rdev; |
245f46c2 N |
2997 | |
2998 | if (mddev->pers == NULL) { | |
2999 | if (len == 0) | |
3000 | return 0; | |
3001 | if (len >= sizeof(mddev->clevel)) | |
3002 | return -ENOSPC; | |
3003 | strncpy(mddev->clevel, buf, len); | |
3004 | if (mddev->clevel[len-1] == '\n') | |
3005 | len--; | |
3006 | mddev->clevel[len] = 0; | |
3007 | mddev->level = LEVEL_NONE; | |
3008 | return rv; | |
3009 | } | |
3010 | ||
3011 | /* request to change the personality. Need to ensure: | |
3012 | * - array is not engaged in resync/recovery/reshape | |
3013 | * - old personality can be suspended | |
3014 | * - new personality will access other array. | |
3015 | */ | |
3016 | ||
bb4f1e9d N |
3017 | if (mddev->sync_thread || |
3018 | mddev->reshape_position != MaxSector || | |
3019 | mddev->sysfs_active) | |
d9d166c2 | 3020 | return -EBUSY; |
245f46c2 N |
3021 | |
3022 | if (!mddev->pers->quiesce) { | |
3023 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3024 | mdname(mddev), mddev->pers->name); | |
3025 | return -EINVAL; | |
3026 | } | |
3027 | ||
3028 | /* Now find the new personality */ | |
f2859af6 | 3029 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3030 | return -EINVAL; |
f2859af6 DW |
3031 | strncpy(clevel, buf, len); |
3032 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3033 | len--; |
f2859af6 DW |
3034 | clevel[len] = 0; |
3035 | if (strict_strtol(clevel, 10, &level)) | |
3036 | level = LEVEL_NONE; | |
245f46c2 | 3037 | |
f2859af6 DW |
3038 | if (request_module("md-%s", clevel) != 0) |
3039 | request_module("md-level-%s", clevel); | |
245f46c2 | 3040 | spin_lock(&pers_lock); |
f2859af6 | 3041 | pers = find_pers(level, clevel); |
245f46c2 N |
3042 | if (!pers || !try_module_get(pers->owner)) { |
3043 | spin_unlock(&pers_lock); | |
f2859af6 | 3044 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3045 | return -EINVAL; |
3046 | } | |
3047 | spin_unlock(&pers_lock); | |
3048 | ||
3049 | if (pers == mddev->pers) { | |
3050 | /* Nothing to do! */ | |
3051 | module_put(pers->owner); | |
3052 | return rv; | |
3053 | } | |
3054 | if (!pers->takeover) { | |
3055 | module_put(pers->owner); | |
3056 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3057 | mdname(mddev), clevel); |
245f46c2 N |
3058 | return -EINVAL; |
3059 | } | |
3060 | ||
e93f68a1 N |
3061 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3062 | rdev->new_raid_disk = rdev->raid_disk; | |
3063 | ||
245f46c2 N |
3064 | /* ->takeover must set new_* and/or delta_disks |
3065 | * if it succeeds, and may set them when it fails. | |
3066 | */ | |
3067 | priv = pers->takeover(mddev); | |
3068 | if (IS_ERR(priv)) { | |
3069 | mddev->new_level = mddev->level; | |
3070 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3071 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3072 | mddev->raid_disks -= mddev->delta_disks; |
3073 | mddev->delta_disks = 0; | |
3074 | module_put(pers->owner); | |
3075 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3076 | mdname(mddev), clevel); |
245f46c2 N |
3077 | return PTR_ERR(priv); |
3078 | } | |
3079 | ||
3080 | /* Looks like we have a winner */ | |
3081 | mddev_suspend(mddev); | |
3082 | mddev->pers->stop(mddev); | |
a64c876f N |
3083 | |
3084 | if (mddev->pers->sync_request == NULL && | |
3085 | pers->sync_request != NULL) { | |
3086 | /* need to add the md_redundancy_group */ | |
3087 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3088 | printk(KERN_WARNING | |
3089 | "md: cannot register extra attributes for %s\n", | |
3090 | mdname(mddev)); | |
19fdb9ee | 3091 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3092 | } |
3093 | if (mddev->pers->sync_request != NULL && | |
3094 | pers->sync_request == NULL) { | |
3095 | /* need to remove the md_redundancy_group */ | |
3096 | if (mddev->to_remove == NULL) | |
3097 | mddev->to_remove = &md_redundancy_group; | |
3098 | } | |
3099 | ||
54071b38 TM |
3100 | if (mddev->pers->sync_request == NULL && |
3101 | mddev->external) { | |
3102 | /* We are converting from a no-redundancy array | |
3103 | * to a redundancy array and metadata is managed | |
3104 | * externally so we need to be sure that writes | |
3105 | * won't block due to a need to transition | |
3106 | * clean->dirty | |
3107 | * until external management is started. | |
3108 | */ | |
3109 | mddev->in_sync = 0; | |
3110 | mddev->safemode_delay = 0; | |
3111 | mddev->safemode = 0; | |
3112 | } | |
3113 | ||
e93f68a1 N |
3114 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
3115 | char nm[20]; | |
3116 | if (rdev->raid_disk < 0) | |
3117 | continue; | |
3118 | if (rdev->new_raid_disk > mddev->raid_disks) | |
3119 | rdev->new_raid_disk = -1; | |
3120 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3121 | continue; | |
3122 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3123 | sysfs_remove_link(&mddev->kobj, nm); | |
3124 | } | |
3125 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3126 | if (rdev->raid_disk < 0) | |
3127 | continue; | |
3128 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3129 | continue; | |
3130 | rdev->raid_disk = rdev->new_raid_disk; | |
3131 | if (rdev->raid_disk < 0) | |
3a981b03 | 3132 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 N |
3133 | else { |
3134 | char nm[20]; | |
3135 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3136 | if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) | |
3137 | printk("md: cannot register %s for %s after level change\n", | |
3138 | nm, mdname(mddev)); | |
3a981b03 | 3139 | } |
e93f68a1 N |
3140 | } |
3141 | ||
3142 | module_put(mddev->pers->owner); | |
245f46c2 N |
3143 | mddev->pers = pers; |
3144 | mddev->private = priv; | |
3145 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3146 | mddev->level = mddev->new_level; | |
3147 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3148 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3149 | mddev->delta_disks = 0; |
9af204cf TM |
3150 | if (mddev->pers->sync_request == NULL) { |
3151 | /* this is now an array without redundancy, so | |
3152 | * it must always be in_sync | |
3153 | */ | |
3154 | mddev->in_sync = 1; | |
3155 | del_timer_sync(&mddev->safemode_timer); | |
3156 | } | |
245f46c2 N |
3157 | pers->run(mddev); |
3158 | mddev_resume(mddev); | |
3159 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3160 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3161 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3162 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3163 | md_new_event(mddev); |
d9d166c2 N |
3164 | return rv; |
3165 | } | |
3166 | ||
3167 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3168 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3169 | |
d4dbd025 N |
3170 | |
3171 | static ssize_t | |
3172 | layout_show(mddev_t *mddev, char *page) | |
3173 | { | |
3174 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3175 | if (mddev->reshape_position != MaxSector && |
3176 | mddev->layout != mddev->new_layout) | |
3177 | return sprintf(page, "%d (%d)\n", | |
3178 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3179 | return sprintf(page, "%d\n", mddev->layout); |
3180 | } | |
3181 | ||
3182 | static ssize_t | |
3183 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3184 | { | |
3185 | char *e; | |
3186 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3187 | |
3188 | if (!*buf || (*e && *e != '\n')) | |
3189 | return -EINVAL; | |
3190 | ||
b3546035 N |
3191 | if (mddev->pers) { |
3192 | int err; | |
50ac168a | 3193 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3194 | return -EBUSY; |
597a711b | 3195 | mddev->new_layout = n; |
50ac168a | 3196 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3197 | if (err) { |
3198 | mddev->new_layout = mddev->layout; | |
b3546035 | 3199 | return err; |
597a711b | 3200 | } |
b3546035 | 3201 | } else { |
08a02ecd | 3202 | mddev->new_layout = n; |
b3546035 N |
3203 | if (mddev->reshape_position == MaxSector) |
3204 | mddev->layout = n; | |
3205 | } | |
d4dbd025 N |
3206 | return len; |
3207 | } | |
3208 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3209 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3210 | |
3211 | ||
eae1701f | 3212 | static ssize_t |
96de1e66 | 3213 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3214 | { |
bb636547 N |
3215 | if (mddev->raid_disks == 0) |
3216 | return 0; | |
08a02ecd N |
3217 | if (mddev->reshape_position != MaxSector && |
3218 | mddev->delta_disks != 0) | |
3219 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3220 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3221 | return sprintf(page, "%d\n", mddev->raid_disks); |
3222 | } | |
3223 | ||
da943b99 N |
3224 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3225 | ||
3226 | static ssize_t | |
3227 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3228 | { | |
da943b99 N |
3229 | char *e; |
3230 | int rv = 0; | |
3231 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3232 | ||
3233 | if (!*buf || (*e && *e != '\n')) | |
3234 | return -EINVAL; | |
3235 | ||
3236 | if (mddev->pers) | |
3237 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3238 | else if (mddev->reshape_position != MaxSector) { |
3239 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3240 | mddev->delta_disks = n - olddisks; | |
3241 | mddev->raid_disks = n; | |
3242 | } else | |
da943b99 N |
3243 | mddev->raid_disks = n; |
3244 | return rv ? rv : len; | |
3245 | } | |
3246 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3247 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3248 | |
3b34380a N |
3249 | static ssize_t |
3250 | chunk_size_show(mddev_t *mddev, char *page) | |
3251 | { | |
08a02ecd | 3252 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3253 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3254 | return sprintf(page, "%d (%d)\n", | |
3255 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3256 | mddev->chunk_sectors << 9); |
3257 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3258 | } |
3259 | ||
3260 | static ssize_t | |
3261 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3262 | { | |
3b34380a N |
3263 | char *e; |
3264 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3265 | ||
3b34380a N |
3266 | if (!*buf || (*e && *e != '\n')) |
3267 | return -EINVAL; | |
3268 | ||
b3546035 N |
3269 | if (mddev->pers) { |
3270 | int err; | |
50ac168a | 3271 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3272 | return -EBUSY; |
597a711b | 3273 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3274 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3275 | if (err) { |
3276 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3277 | return err; |
597a711b | 3278 | } |
b3546035 | 3279 | } else { |
664e7c41 | 3280 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3281 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3282 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3283 | } |
3b34380a N |
3284 | return len; |
3285 | } | |
3286 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3287 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3288 | |
a94213b1 N |
3289 | static ssize_t |
3290 | resync_start_show(mddev_t *mddev, char *page) | |
3291 | { | |
d1a7c503 N |
3292 | if (mddev->recovery_cp == MaxSector) |
3293 | return sprintf(page, "none\n"); | |
a94213b1 N |
3294 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3295 | } | |
3296 | ||
3297 | static ssize_t | |
3298 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3299 | { | |
a94213b1 N |
3300 | char *e; |
3301 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3302 | ||
3303 | if (mddev->pers) | |
3304 | return -EBUSY; | |
06e3c817 DW |
3305 | if (cmd_match(buf, "none")) |
3306 | n = MaxSector; | |
3307 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3308 | return -EINVAL; |
3309 | ||
3310 | mddev->recovery_cp = n; | |
3311 | return len; | |
3312 | } | |
3313 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3314 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3315 | |
9e653b63 N |
3316 | /* |
3317 | * The array state can be: | |
3318 | * | |
3319 | * clear | |
3320 | * No devices, no size, no level | |
3321 | * Equivalent to STOP_ARRAY ioctl | |
3322 | * inactive | |
3323 | * May have some settings, but array is not active | |
3324 | * all IO results in error | |
3325 | * When written, doesn't tear down array, but just stops it | |
3326 | * suspended (not supported yet) | |
3327 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3328 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3329 | * readonly |
3330 | * no resync can happen. no superblocks get written. | |
3331 | * write requests fail | |
3332 | * read-auto | |
3333 | * like readonly, but behaves like 'clean' on a write request. | |
3334 | * | |
3335 | * clean - no pending writes, but otherwise active. | |
3336 | * When written to inactive array, starts without resync | |
3337 | * If a write request arrives then | |
3338 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3339 | * if not known, block and switch to write-pending | |
3340 | * If written to an active array that has pending writes, then fails. | |
3341 | * active | |
3342 | * fully active: IO and resync can be happening. | |
3343 | * When written to inactive array, starts with resync | |
3344 | * | |
3345 | * write-pending | |
3346 | * clean, but writes are blocked waiting for 'active' to be written. | |
3347 | * | |
3348 | * active-idle | |
3349 | * like active, but no writes have been seen for a while (100msec). | |
3350 | * | |
3351 | */ | |
3352 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3353 | write_pending, active_idle, bad_word}; | |
05381954 | 3354 | static char *array_states[] = { |
9e653b63 N |
3355 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3356 | "write-pending", "active-idle", NULL }; | |
3357 | ||
3358 | static int match_word(const char *word, char **list) | |
3359 | { | |
3360 | int n; | |
3361 | for (n=0; list[n]; n++) | |
3362 | if (cmd_match(word, list[n])) | |
3363 | break; | |
3364 | return n; | |
3365 | } | |
3366 | ||
3367 | static ssize_t | |
3368 | array_state_show(mddev_t *mddev, char *page) | |
3369 | { | |
3370 | enum array_state st = inactive; | |
3371 | ||
3372 | if (mddev->pers) | |
3373 | switch(mddev->ro) { | |
3374 | case 1: | |
3375 | st = readonly; | |
3376 | break; | |
3377 | case 2: | |
3378 | st = read_auto; | |
3379 | break; | |
3380 | case 0: | |
3381 | if (mddev->in_sync) | |
3382 | st = clean; | |
070dc6dd | 3383 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3384 | st = write_pending; |
9e653b63 N |
3385 | else if (mddev->safemode) |
3386 | st = active_idle; | |
3387 | else | |
3388 | st = active; | |
3389 | } | |
3390 | else { | |
3391 | if (list_empty(&mddev->disks) && | |
3392 | mddev->raid_disks == 0 && | |
58c0fed4 | 3393 | mddev->dev_sectors == 0) |
9e653b63 N |
3394 | st = clear; |
3395 | else | |
3396 | st = inactive; | |
3397 | } | |
3398 | return sprintf(page, "%s\n", array_states[st]); | |
3399 | } | |
3400 | ||
df5b20cf | 3401 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3402 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3403 | static int do_md_run(mddev_t * mddev); |
3404 | static int restart_array(mddev_t *mddev); | |
3405 | ||
3406 | static ssize_t | |
3407 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3408 | { | |
3409 | int err = -EINVAL; | |
3410 | enum array_state st = match_word(buf, array_states); | |
3411 | switch(st) { | |
3412 | case bad_word: | |
3413 | break; | |
3414 | case clear: | |
3415 | /* stopping an active array */ | |
f2ea68cf | 3416 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3417 | return -EBUSY; |
df5b20cf | 3418 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3419 | break; |
3420 | case inactive: | |
3421 | /* stopping an active array */ | |
3422 | if (mddev->pers) { | |
f2ea68cf | 3423 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3424 | return -EBUSY; |
df5b20cf | 3425 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3426 | } else |
3427 | err = 0; /* already inactive */ | |
9e653b63 N |
3428 | break; |
3429 | case suspended: | |
3430 | break; /* not supported yet */ | |
3431 | case readonly: | |
3432 | if (mddev->pers) | |
a4bd82d0 | 3433 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3434 | else { |
3435 | mddev->ro = 1; | |
648b629e | 3436 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3437 | err = do_md_run(mddev); |
3438 | } | |
3439 | break; | |
3440 | case read_auto: | |
9e653b63 | 3441 | if (mddev->pers) { |
80268ee9 | 3442 | if (mddev->ro == 0) |
a4bd82d0 | 3443 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3444 | else if (mddev->ro == 1) |
648b629e N |
3445 | err = restart_array(mddev); |
3446 | if (err == 0) { | |
3447 | mddev->ro = 2; | |
3448 | set_disk_ro(mddev->gendisk, 0); | |
3449 | } | |
9e653b63 N |
3450 | } else { |
3451 | mddev->ro = 2; | |
3452 | err = do_md_run(mddev); | |
3453 | } | |
3454 | break; | |
3455 | case clean: | |
3456 | if (mddev->pers) { | |
3457 | restart_array(mddev); | |
3458 | spin_lock_irq(&mddev->write_lock); | |
3459 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3460 | if (mddev->in_sync == 0) { |
3461 | mddev->in_sync = 1; | |
31a59e34 N |
3462 | if (mddev->safemode == 1) |
3463 | mddev->safemode = 0; | |
070dc6dd | 3464 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3465 | } |
3466 | err = 0; | |
3467 | } else | |
3468 | err = -EBUSY; | |
9e653b63 | 3469 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3470 | } else |
3471 | err = -EINVAL; | |
9e653b63 N |
3472 | break; |
3473 | case active: | |
3474 | if (mddev->pers) { | |
3475 | restart_array(mddev); | |
070dc6dd | 3476 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3477 | wake_up(&mddev->sb_wait); |
3478 | err = 0; | |
3479 | } else { | |
3480 | mddev->ro = 0; | |
648b629e | 3481 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3482 | err = do_md_run(mddev); |
3483 | } | |
3484 | break; | |
3485 | case write_pending: | |
3486 | case active_idle: | |
3487 | /* these cannot be set */ | |
3488 | break; | |
3489 | } | |
3490 | if (err) | |
3491 | return err; | |
0fd62b86 | 3492 | else { |
00bcb4ac | 3493 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3494 | return len; |
0fd62b86 | 3495 | } |
9e653b63 | 3496 | } |
80ca3a44 N |
3497 | static struct md_sysfs_entry md_array_state = |
3498 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3499 | |
1e50915f RB |
3500 | static ssize_t |
3501 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3502 | return sprintf(page, "%d\n", | |
3503 | atomic_read(&mddev->max_corr_read_errors)); | |
3504 | } | |
3505 | ||
3506 | static ssize_t | |
3507 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3508 | { | |
3509 | char *e; | |
3510 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3511 | ||
3512 | if (*buf && (*e == 0 || *e == '\n')) { | |
3513 | atomic_set(&mddev->max_corr_read_errors, n); | |
3514 | return len; | |
3515 | } | |
3516 | return -EINVAL; | |
3517 | } | |
3518 | ||
3519 | static struct md_sysfs_entry max_corr_read_errors = | |
3520 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3521 | max_corrected_read_errors_store); | |
3522 | ||
6d7ff738 N |
3523 | static ssize_t |
3524 | null_show(mddev_t *mddev, char *page) | |
3525 | { | |
3526 | return -EINVAL; | |
3527 | } | |
3528 | ||
3529 | static ssize_t | |
3530 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3531 | { | |
3532 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3533 | /* The new device is added to the array. | |
3534 | * If the array has a persistent superblock, we read the | |
3535 | * superblock to initialise info and check validity. | |
3536 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3537 | * which mainly checks size. | |
3538 | */ | |
3539 | char *e; | |
3540 | int major = simple_strtoul(buf, &e, 10); | |
3541 | int minor; | |
3542 | dev_t dev; | |
3543 | mdk_rdev_t *rdev; | |
3544 | int err; | |
3545 | ||
3546 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3547 | return -EINVAL; | |
3548 | minor = simple_strtoul(e+1, &e, 10); | |
3549 | if (*e && *e != '\n') | |
3550 | return -EINVAL; | |
3551 | dev = MKDEV(major, minor); | |
3552 | if (major != MAJOR(dev) || | |
3553 | minor != MINOR(dev)) | |
3554 | return -EOVERFLOW; | |
3555 | ||
3556 | ||
3557 | if (mddev->persistent) { | |
3558 | rdev = md_import_device(dev, mddev->major_version, | |
3559 | mddev->minor_version); | |
3560 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3561 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3562 | mdk_rdev_t, same_set); | |
3563 | err = super_types[mddev->major_version] | |
3564 | .load_super(rdev, rdev0, mddev->minor_version); | |
3565 | if (err < 0) | |
3566 | goto out; | |
3567 | } | |
c5d79adb N |
3568 | } else if (mddev->external) |
3569 | rdev = md_import_device(dev, -2, -1); | |
3570 | else | |
6d7ff738 N |
3571 | rdev = md_import_device(dev, -1, -1); |
3572 | ||
3573 | if (IS_ERR(rdev)) | |
3574 | return PTR_ERR(rdev); | |
3575 | err = bind_rdev_to_array(rdev, mddev); | |
3576 | out: | |
3577 | if (err) | |
3578 | export_rdev(rdev); | |
3579 | return err ? err : len; | |
3580 | } | |
3581 | ||
3582 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3583 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3584 | |
9b1d1dac PC |
3585 | static ssize_t |
3586 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3587 | { | |
3588 | char *end; | |
3589 | unsigned long chunk, end_chunk; | |
3590 | ||
3591 | if (!mddev->bitmap) | |
3592 | goto out; | |
3593 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3594 | while (*buf) { | |
3595 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3596 | if (buf == end) break; | |
3597 | if (*end == '-') { /* range */ | |
3598 | buf = end + 1; | |
3599 | end_chunk = simple_strtoul(buf, &end, 0); | |
3600 | if (buf == end) break; | |
3601 | } | |
3602 | if (*end && !isspace(*end)) break; | |
3603 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3604 | buf = skip_spaces(end); |
9b1d1dac PC |
3605 | } |
3606 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3607 | out: | |
3608 | return len; | |
3609 | } | |
3610 | ||
3611 | static struct md_sysfs_entry md_bitmap = | |
3612 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3613 | ||
a35b0d69 N |
3614 | static ssize_t |
3615 | size_show(mddev_t *mddev, char *page) | |
3616 | { | |
58c0fed4 AN |
3617 | return sprintf(page, "%llu\n", |
3618 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3619 | } |
3620 | ||
d71f9f88 | 3621 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3622 | |
3623 | static ssize_t | |
3624 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3625 | { | |
3626 | /* If array is inactive, we can reduce the component size, but | |
3627 | * not increase it (except from 0). | |
3628 | * If array is active, we can try an on-line resize | |
3629 | */ | |
b522adcd DW |
3630 | sector_t sectors; |
3631 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3632 | |
58c0fed4 AN |
3633 | if (err < 0) |
3634 | return err; | |
a35b0d69 | 3635 | if (mddev->pers) { |
58c0fed4 | 3636 | err = update_size(mddev, sectors); |
850b2b42 | 3637 | md_update_sb(mddev, 1); |
a35b0d69 | 3638 | } else { |
58c0fed4 AN |
3639 | if (mddev->dev_sectors == 0 || |
3640 | mddev->dev_sectors > sectors) | |
3641 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3642 | else |
3643 | err = -ENOSPC; | |
3644 | } | |
3645 | return err ? err : len; | |
3646 | } | |
3647 | ||
3648 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3649 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3650 | |
8bb93aac N |
3651 | |
3652 | /* Metdata version. | |
e691063a N |
3653 | * This is one of |
3654 | * 'none' for arrays with no metadata (good luck...) | |
3655 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3656 | * or N.M for internally known formats |
3657 | */ | |
3658 | static ssize_t | |
3659 | metadata_show(mddev_t *mddev, char *page) | |
3660 | { | |
3661 | if (mddev->persistent) | |
3662 | return sprintf(page, "%d.%d\n", | |
3663 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3664 | else if (mddev->external) |
3665 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3666 | else |
3667 | return sprintf(page, "none\n"); | |
3668 | } | |
3669 | ||
3670 | static ssize_t | |
3671 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3672 | { | |
3673 | int major, minor; | |
3674 | char *e; | |
ea43ddd8 N |
3675 | /* Changing the details of 'external' metadata is |
3676 | * always permitted. Otherwise there must be | |
3677 | * no devices attached to the array. | |
3678 | */ | |
3679 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3680 | ; | |
3681 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3682 | return -EBUSY; |
3683 | ||
3684 | if (cmd_match(buf, "none")) { | |
3685 | mddev->persistent = 0; | |
e691063a N |
3686 | mddev->external = 0; |
3687 | mddev->major_version = 0; | |
3688 | mddev->minor_version = 90; | |
3689 | return len; | |
3690 | } | |
3691 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3692 | size_t namelen = len-9; |
e691063a N |
3693 | if (namelen >= sizeof(mddev->metadata_type)) |
3694 | namelen = sizeof(mddev->metadata_type)-1; | |
3695 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3696 | mddev->metadata_type[namelen] = 0; | |
3697 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3698 | mddev->metadata_type[--namelen] = 0; | |
3699 | mddev->persistent = 0; | |
3700 | mddev->external = 1; | |
8bb93aac N |
3701 | mddev->major_version = 0; |
3702 | mddev->minor_version = 90; | |
3703 | return len; | |
3704 | } | |
3705 | major = simple_strtoul(buf, &e, 10); | |
3706 | if (e==buf || *e != '.') | |
3707 | return -EINVAL; | |
3708 | buf = e+1; | |
3709 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3710 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3711 | return -EINVAL; |
50511da3 | 3712 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3713 | return -ENOENT; |
3714 | mddev->major_version = major; | |
3715 | mddev->minor_version = minor; | |
3716 | mddev->persistent = 1; | |
e691063a | 3717 | mddev->external = 0; |
8bb93aac N |
3718 | return len; |
3719 | } | |
3720 | ||
3721 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3722 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3723 | |
24dd469d | 3724 | static ssize_t |
7eec314d | 3725 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3726 | { |
7eec314d | 3727 | char *type = "idle"; |
b6a9ce68 N |
3728 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3729 | type = "frozen"; | |
3730 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3731 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3732 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3733 | type = "reshape"; | |
3734 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3735 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3736 | type = "resync"; | |
3737 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3738 | type = "check"; | |
3739 | else | |
3740 | type = "repair"; | |
72a23c21 | 3741 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3742 | type = "recover"; |
3743 | } | |
3744 | return sprintf(page, "%s\n", type); | |
3745 | } | |
3746 | ||
3747 | static ssize_t | |
7eec314d | 3748 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3749 | { |
7eec314d N |
3750 | if (!mddev->pers || !mddev->pers->sync_request) |
3751 | return -EINVAL; | |
3752 | ||
b6a9ce68 N |
3753 | if (cmd_match(page, "frozen")) |
3754 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3755 | else | |
3756 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3757 | ||
3758 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3759 | if (mddev->sync_thread) { |
3760 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3761 | md_unregister_thread(mddev->sync_thread); | |
3762 | mddev->sync_thread = NULL; | |
3763 | mddev->recovery = 0; | |
3764 | } | |
03c902e1 N |
3765 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3766 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3767 | return -EBUSY; |
72a23c21 NB |
3768 | else if (cmd_match(page, "resync")) |
3769 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3770 | else if (cmd_match(page, "recover")) { | |
3771 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3772 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3773 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3774 | int err; |
3775 | if (mddev->pers->start_reshape == NULL) | |
3776 | return -EINVAL; | |
3777 | err = mddev->pers->start_reshape(mddev); | |
3778 | if (err) | |
3779 | return err; | |
a99ac971 | 3780 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3781 | } else { |
bce74dac | 3782 | if (cmd_match(page, "check")) |
7eec314d | 3783 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3784 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3785 | return -EINVAL; |
3786 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3787 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3788 | } |
03c902e1 | 3789 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3790 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 3791 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
3792 | return len; |
3793 | } | |
3794 | ||
9d88883e | 3795 | static ssize_t |
96de1e66 | 3796 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3797 | { |
3798 | return sprintf(page, "%llu\n", | |
3799 | (unsigned long long) mddev->resync_mismatches); | |
3800 | } | |
3801 | ||
80ca3a44 N |
3802 | static struct md_sysfs_entry md_scan_mode = |
3803 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3804 | |
96de1e66 | 3805 | |
80ca3a44 | 3806 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3807 | |
88202a0c N |
3808 | static ssize_t |
3809 | sync_min_show(mddev_t *mddev, char *page) | |
3810 | { | |
3811 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3812 | mddev->sync_speed_min ? "local": "system"); | |
3813 | } | |
3814 | ||
3815 | static ssize_t | |
3816 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3817 | { | |
3818 | int min; | |
3819 | char *e; | |
3820 | if (strncmp(buf, "system", 6)==0) { | |
3821 | mddev->sync_speed_min = 0; | |
3822 | return len; | |
3823 | } | |
3824 | min = simple_strtoul(buf, &e, 10); | |
3825 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3826 | return -EINVAL; | |
3827 | mddev->sync_speed_min = min; | |
3828 | return len; | |
3829 | } | |
3830 | ||
3831 | static struct md_sysfs_entry md_sync_min = | |
3832 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3833 | ||
3834 | static ssize_t | |
3835 | sync_max_show(mddev_t *mddev, char *page) | |
3836 | { | |
3837 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3838 | mddev->sync_speed_max ? "local": "system"); | |
3839 | } | |
3840 | ||
3841 | static ssize_t | |
3842 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3843 | { | |
3844 | int max; | |
3845 | char *e; | |
3846 | if (strncmp(buf, "system", 6)==0) { | |
3847 | mddev->sync_speed_max = 0; | |
3848 | return len; | |
3849 | } | |
3850 | max = simple_strtoul(buf, &e, 10); | |
3851 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3852 | return -EINVAL; | |
3853 | mddev->sync_speed_max = max; | |
3854 | return len; | |
3855 | } | |
3856 | ||
3857 | static struct md_sysfs_entry md_sync_max = | |
3858 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3859 | ||
d7f3d291 IP |
3860 | static ssize_t |
3861 | degraded_show(mddev_t *mddev, char *page) | |
3862 | { | |
3863 | return sprintf(page, "%d\n", mddev->degraded); | |
3864 | } | |
3865 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3866 | |
90b08710 BS |
3867 | static ssize_t |
3868 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3869 | { | |
3870 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3871 | } | |
3872 | ||
3873 | static ssize_t | |
3874 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3875 | { | |
3876 | long n; | |
3877 | ||
3878 | if (strict_strtol(buf, 10, &n)) | |
3879 | return -EINVAL; | |
3880 | ||
3881 | if (n != 0 && n != 1) | |
3882 | return -EINVAL; | |
3883 | ||
3884 | mddev->parallel_resync = n; | |
3885 | ||
3886 | if (mddev->sync_thread) | |
3887 | wake_up(&resync_wait); | |
3888 | ||
3889 | return len; | |
3890 | } | |
3891 | ||
3892 | /* force parallel resync, even with shared block devices */ | |
3893 | static struct md_sysfs_entry md_sync_force_parallel = | |
3894 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3895 | sync_force_parallel_show, sync_force_parallel_store); | |
3896 | ||
88202a0c N |
3897 | static ssize_t |
3898 | sync_speed_show(mddev_t *mddev, char *page) | |
3899 | { | |
3900 | unsigned long resync, dt, db; | |
d1a7c503 N |
3901 | if (mddev->curr_resync == 0) |
3902 | return sprintf(page, "none\n"); | |
9687a60c AN |
3903 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3904 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3905 | if (!dt) dt++; |
9687a60c AN |
3906 | db = resync - mddev->resync_mark_cnt; |
3907 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3908 | } |
3909 | ||
80ca3a44 | 3910 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3911 | |
3912 | static ssize_t | |
3913 | sync_completed_show(mddev_t *mddev, char *page) | |
3914 | { | |
58c0fed4 | 3915 | unsigned long max_sectors, resync; |
88202a0c | 3916 | |
acb180b0 N |
3917 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3918 | return sprintf(page, "none\n"); | |
3919 | ||
88202a0c | 3920 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3921 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3922 | else |
58c0fed4 | 3923 | max_sectors = mddev->dev_sectors; |
88202a0c | 3924 | |
acb180b0 | 3925 | resync = mddev->curr_resync_completed; |
58c0fed4 | 3926 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3927 | } |
3928 | ||
80ca3a44 | 3929 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3930 | |
5e96ee65 NB |
3931 | static ssize_t |
3932 | min_sync_show(mddev_t *mddev, char *page) | |
3933 | { | |
3934 | return sprintf(page, "%llu\n", | |
3935 | (unsigned long long)mddev->resync_min); | |
3936 | } | |
3937 | static ssize_t | |
3938 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3939 | { | |
3940 | unsigned long long min; | |
3941 | if (strict_strtoull(buf, 10, &min)) | |
3942 | return -EINVAL; | |
3943 | if (min > mddev->resync_max) | |
3944 | return -EINVAL; | |
3945 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3946 | return -EBUSY; | |
3947 | ||
3948 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3949 | if (mddev->chunk_sectors) { |
2ac06c33 | 3950 | sector_t temp = min; |
9d8f0363 | 3951 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
3952 | return -EINVAL; |
3953 | } | |
3954 | mddev->resync_min = min; | |
3955 | ||
3956 | return len; | |
3957 | } | |
3958 | ||
3959 | static struct md_sysfs_entry md_min_sync = | |
3960 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3961 | ||
c6207277 N |
3962 | static ssize_t |
3963 | max_sync_show(mddev_t *mddev, char *page) | |
3964 | { | |
3965 | if (mddev->resync_max == MaxSector) | |
3966 | return sprintf(page, "max\n"); | |
3967 | else | |
3968 | return sprintf(page, "%llu\n", | |
3969 | (unsigned long long)mddev->resync_max); | |
3970 | } | |
3971 | static ssize_t | |
3972 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3973 | { | |
3974 | if (strncmp(buf, "max", 3) == 0) | |
3975 | mddev->resync_max = MaxSector; | |
3976 | else { | |
5e96ee65 NB |
3977 | unsigned long long max; |
3978 | if (strict_strtoull(buf, 10, &max)) | |
3979 | return -EINVAL; | |
3980 | if (max < mddev->resync_min) | |
c6207277 N |
3981 | return -EINVAL; |
3982 | if (max < mddev->resync_max && | |
4d484a4a | 3983 | mddev->ro == 0 && |
c6207277 N |
3984 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3985 | return -EBUSY; | |
3986 | ||
3987 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3988 | if (mddev->chunk_sectors) { |
2ac06c33 | 3989 | sector_t temp = max; |
9d8f0363 | 3990 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
3991 | return -EINVAL; |
3992 | } | |
3993 | mddev->resync_max = max; | |
3994 | } | |
3995 | wake_up(&mddev->recovery_wait); | |
3996 | return len; | |
3997 | } | |
3998 | ||
3999 | static struct md_sysfs_entry md_max_sync = | |
4000 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4001 | ||
e464eafd N |
4002 | static ssize_t |
4003 | suspend_lo_show(mddev_t *mddev, char *page) | |
4004 | { | |
4005 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4006 | } | |
4007 | ||
4008 | static ssize_t | |
4009 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
4010 | { | |
4011 | char *e; | |
4012 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4013 | ||
b8d966ef N |
4014 | if (mddev->pers == NULL || |
4015 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4016 | return -EINVAL; |
4017 | if (buf == e || (*e && *e != '\n')) | |
4018 | return -EINVAL; | |
4019 | if (new >= mddev->suspend_hi || | |
4020 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
4021 | mddev->suspend_lo = new; | |
4022 | mddev->pers->quiesce(mddev, 2); | |
4023 | return len; | |
4024 | } else | |
4025 | return -EINVAL; | |
4026 | } | |
4027 | static struct md_sysfs_entry md_suspend_lo = | |
4028 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4029 | ||
4030 | ||
4031 | static ssize_t | |
4032 | suspend_hi_show(mddev_t *mddev, char *page) | |
4033 | { | |
4034 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4035 | } | |
4036 | ||
4037 | static ssize_t | |
4038 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
4039 | { | |
4040 | char *e; | |
4041 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4042 | ||
b8d966ef N |
4043 | if (mddev->pers == NULL || |
4044 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4045 | return -EINVAL; |
4046 | if (buf == e || (*e && *e != '\n')) | |
4047 | return -EINVAL; | |
4048 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
4049 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
4050 | mddev->suspend_hi = new; | |
4051 | mddev->pers->quiesce(mddev, 1); | |
4052 | mddev->pers->quiesce(mddev, 0); | |
4053 | return len; | |
4054 | } else | |
4055 | return -EINVAL; | |
4056 | } | |
4057 | static struct md_sysfs_entry md_suspend_hi = | |
4058 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4059 | ||
08a02ecd N |
4060 | static ssize_t |
4061 | reshape_position_show(mddev_t *mddev, char *page) | |
4062 | { | |
4063 | if (mddev->reshape_position != MaxSector) | |
4064 | return sprintf(page, "%llu\n", | |
4065 | (unsigned long long)mddev->reshape_position); | |
4066 | strcpy(page, "none\n"); | |
4067 | return 5; | |
4068 | } | |
4069 | ||
4070 | static ssize_t | |
4071 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4072 | { | |
4073 | char *e; | |
4074 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4075 | if (mddev->pers) | |
4076 | return -EBUSY; | |
4077 | if (buf == e || (*e && *e != '\n')) | |
4078 | return -EINVAL; | |
4079 | mddev->reshape_position = new; | |
4080 | mddev->delta_disks = 0; | |
4081 | mddev->new_level = mddev->level; | |
4082 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4083 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4084 | return len; |
4085 | } | |
4086 | ||
4087 | static struct md_sysfs_entry md_reshape_position = | |
4088 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4089 | reshape_position_store); | |
4090 | ||
b522adcd DW |
4091 | static ssize_t |
4092 | array_size_show(mddev_t *mddev, char *page) | |
4093 | { | |
4094 | if (mddev->external_size) | |
4095 | return sprintf(page, "%llu\n", | |
4096 | (unsigned long long)mddev->array_sectors/2); | |
4097 | else | |
4098 | return sprintf(page, "default\n"); | |
4099 | } | |
4100 | ||
4101 | static ssize_t | |
4102 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4103 | { | |
4104 | sector_t sectors; | |
4105 | ||
4106 | if (strncmp(buf, "default", 7) == 0) { | |
4107 | if (mddev->pers) | |
4108 | sectors = mddev->pers->size(mddev, 0, 0); | |
4109 | else | |
4110 | sectors = mddev->array_sectors; | |
4111 | ||
4112 | mddev->external_size = 0; | |
4113 | } else { | |
4114 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4115 | return -EINVAL; | |
4116 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4117 | return -E2BIG; |
b522adcd DW |
4118 | |
4119 | mddev->external_size = 1; | |
4120 | } | |
4121 | ||
4122 | mddev->array_sectors = sectors; | |
4123 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e N |
4124 | if (mddev->pers) |
4125 | revalidate_disk(mddev->gendisk); | |
b522adcd DW |
4126 | |
4127 | return len; | |
4128 | } | |
4129 | ||
4130 | static struct md_sysfs_entry md_array_size = | |
4131 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4132 | array_size_store); | |
e464eafd | 4133 | |
eae1701f N |
4134 | static struct attribute *md_default_attrs[] = { |
4135 | &md_level.attr, | |
d4dbd025 | 4136 | &md_layout.attr, |
eae1701f | 4137 | &md_raid_disks.attr, |
3b34380a | 4138 | &md_chunk_size.attr, |
a35b0d69 | 4139 | &md_size.attr, |
a94213b1 | 4140 | &md_resync_start.attr, |
8bb93aac | 4141 | &md_metadata.attr, |
6d7ff738 | 4142 | &md_new_device.attr, |
16f17b39 | 4143 | &md_safe_delay.attr, |
9e653b63 | 4144 | &md_array_state.attr, |
08a02ecd | 4145 | &md_reshape_position.attr, |
b522adcd | 4146 | &md_array_size.attr, |
1e50915f | 4147 | &max_corr_read_errors.attr, |
411036fa N |
4148 | NULL, |
4149 | }; | |
4150 | ||
4151 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4152 | &md_scan_mode.attr, |
9d88883e | 4153 | &md_mismatches.attr, |
88202a0c N |
4154 | &md_sync_min.attr, |
4155 | &md_sync_max.attr, | |
4156 | &md_sync_speed.attr, | |
90b08710 | 4157 | &md_sync_force_parallel.attr, |
88202a0c | 4158 | &md_sync_completed.attr, |
5e96ee65 | 4159 | &md_min_sync.attr, |
c6207277 | 4160 | &md_max_sync.attr, |
e464eafd N |
4161 | &md_suspend_lo.attr, |
4162 | &md_suspend_hi.attr, | |
9b1d1dac | 4163 | &md_bitmap.attr, |
d7f3d291 | 4164 | &md_degraded.attr, |
eae1701f N |
4165 | NULL, |
4166 | }; | |
411036fa N |
4167 | static struct attribute_group md_redundancy_group = { |
4168 | .name = NULL, | |
4169 | .attrs = md_redundancy_attrs, | |
4170 | }; | |
4171 | ||
eae1701f N |
4172 | |
4173 | static ssize_t | |
4174 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4175 | { | |
4176 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4177 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4178 | ssize_t rv; |
eae1701f N |
4179 | |
4180 | if (!entry->show) | |
4181 | return -EIO; | |
5dc5cf7d IM |
4182 | rv = mddev_lock(mddev); |
4183 | if (!rv) { | |
4184 | rv = entry->show(mddev, page); | |
4185 | mddev_unlock(mddev); | |
4186 | } | |
96de1e66 | 4187 | return rv; |
eae1701f N |
4188 | } |
4189 | ||
4190 | static ssize_t | |
4191 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4192 | const char *page, size_t length) | |
4193 | { | |
4194 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4195 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4196 | ssize_t rv; |
eae1701f N |
4197 | |
4198 | if (!entry->store) | |
4199 | return -EIO; | |
67463acb N |
4200 | if (!capable(CAP_SYS_ADMIN)) |
4201 | return -EACCES; | |
5dc5cf7d | 4202 | rv = mddev_lock(mddev); |
d3374825 N |
4203 | if (mddev->hold_active == UNTIL_IOCTL) |
4204 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4205 | if (!rv) { |
4206 | rv = entry->store(mddev, page, length); | |
4207 | mddev_unlock(mddev); | |
4208 | } | |
96de1e66 | 4209 | return rv; |
eae1701f N |
4210 | } |
4211 | ||
4212 | static void md_free(struct kobject *ko) | |
4213 | { | |
4214 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4215 | |
4216 | if (mddev->sysfs_state) | |
4217 | sysfs_put(mddev->sysfs_state); | |
4218 | ||
4219 | if (mddev->gendisk) { | |
4220 | del_gendisk(mddev->gendisk); | |
4221 | put_disk(mddev->gendisk); | |
4222 | } | |
4223 | if (mddev->queue) | |
4224 | blk_cleanup_queue(mddev->queue); | |
4225 | ||
eae1701f N |
4226 | kfree(mddev); |
4227 | } | |
4228 | ||
52cf25d0 | 4229 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4230 | .show = md_attr_show, |
4231 | .store = md_attr_store, | |
4232 | }; | |
4233 | static struct kobj_type md_ktype = { | |
4234 | .release = md_free, | |
4235 | .sysfs_ops = &md_sysfs_ops, | |
4236 | .default_attrs = md_default_attrs, | |
4237 | }; | |
4238 | ||
1da177e4 LT |
4239 | int mdp_major = 0; |
4240 | ||
5fd3a17e DW |
4241 | static void mddev_delayed_delete(struct work_struct *ws) |
4242 | { | |
4243 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4244 | ||
43a70507 | 4245 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4246 | kobject_del(&mddev->kobj); |
4247 | kobject_put(&mddev->kobj); | |
4248 | } | |
4249 | ||
efeb53c0 | 4250 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4251 | { |
48c9c27b | 4252 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4253 | mddev_t *mddev = mddev_find(dev); |
4254 | struct gendisk *disk; | |
efeb53c0 N |
4255 | int partitioned; |
4256 | int shift; | |
4257 | int unit; | |
3830c62f | 4258 | int error; |
1da177e4 LT |
4259 | |
4260 | if (!mddev) | |
efeb53c0 N |
4261 | return -ENODEV; |
4262 | ||
4263 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4264 | shift = partitioned ? MdpMinorShift : 0; | |
4265 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4266 | |
e804ac78 TH |
4267 | /* wait for any previous instance of this device to be |
4268 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4269 | */ |
e804ac78 | 4270 | flush_workqueue(md_misc_wq); |
d3374825 | 4271 | |
48c9c27b | 4272 | mutex_lock(&disks_mutex); |
0909dc44 N |
4273 | error = -EEXIST; |
4274 | if (mddev->gendisk) | |
4275 | goto abort; | |
efeb53c0 N |
4276 | |
4277 | if (name) { | |
4278 | /* Need to ensure that 'name' is not a duplicate. | |
4279 | */ | |
4280 | mddev_t *mddev2; | |
4281 | spin_lock(&all_mddevs_lock); | |
4282 | ||
4283 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4284 | if (mddev2->gendisk && | |
4285 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4286 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4287 | goto abort; |
efeb53c0 N |
4288 | } |
4289 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4290 | } |
8b765398 | 4291 | |
0909dc44 | 4292 | error = -ENOMEM; |
8b765398 | 4293 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4294 | if (!mddev->queue) |
4295 | goto abort; | |
409c57f3 N |
4296 | mddev->queue->queuedata = mddev; |
4297 | ||
409c57f3 | 4298 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4299 | |
1da177e4 LT |
4300 | disk = alloc_disk(1 << shift); |
4301 | if (!disk) { | |
8b765398 N |
4302 | blk_cleanup_queue(mddev->queue); |
4303 | mddev->queue = NULL; | |
0909dc44 | 4304 | goto abort; |
1da177e4 | 4305 | } |
efeb53c0 | 4306 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4307 | disk->first_minor = unit << shift; |
efeb53c0 N |
4308 | if (name) |
4309 | strcpy(disk->disk_name, name); | |
4310 | else if (partitioned) | |
1da177e4 | 4311 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4312 | else |
1da177e4 | 4313 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4314 | disk->fops = &md_fops; |
4315 | disk->private_data = mddev; | |
4316 | disk->queue = mddev->queue; | |
92850bbd | 4317 | /* Allow extended partitions. This makes the |
d3374825 | 4318 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4319 | * remove it now. |
4320 | */ | |
4321 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
4322 | add_disk(disk); |
4323 | mddev->gendisk = disk; | |
ed9e1982 TH |
4324 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4325 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4326 | if (error) { |
4327 | /* This isn't possible, but as kobject_init_and_add is marked | |
4328 | * __must_check, we must do something with the result | |
4329 | */ | |
5e55e2f5 N |
4330 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4331 | disk->disk_name); | |
0909dc44 N |
4332 | error = 0; |
4333 | } | |
00bcb4ac N |
4334 | if (mddev->kobj.sd && |
4335 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4336 | printk(KERN_DEBUG "pointless warning\n"); |
be20e6c6 DW |
4337 | |
4338 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); | |
0909dc44 N |
4339 | abort: |
4340 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4341 | if (!error && mddev->kobj.sd) { |
3830c62f | 4342 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4343 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4344 | } |
d3374825 | 4345 | mddev_put(mddev); |
0909dc44 | 4346 | return error; |
efeb53c0 N |
4347 | } |
4348 | ||
4349 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4350 | { | |
4351 | md_alloc(dev, NULL); | |
1da177e4 LT |
4352 | return NULL; |
4353 | } | |
4354 | ||
efeb53c0 N |
4355 | static int add_named_array(const char *val, struct kernel_param *kp) |
4356 | { | |
4357 | /* val must be "md_*" where * is not all digits. | |
4358 | * We allocate an array with a large free minor number, and | |
4359 | * set the name to val. val must not already be an active name. | |
4360 | */ | |
4361 | int len = strlen(val); | |
4362 | char buf[DISK_NAME_LEN]; | |
4363 | ||
4364 | while (len && val[len-1] == '\n') | |
4365 | len--; | |
4366 | if (len >= DISK_NAME_LEN) | |
4367 | return -E2BIG; | |
4368 | strlcpy(buf, val, len+1); | |
4369 | if (strncmp(buf, "md_", 3) != 0) | |
4370 | return -EINVAL; | |
4371 | return md_alloc(0, buf); | |
4372 | } | |
4373 | ||
1da177e4 LT |
4374 | static void md_safemode_timeout(unsigned long data) |
4375 | { | |
4376 | mddev_t *mddev = (mddev_t *) data; | |
4377 | ||
0fd62b86 NB |
4378 | if (!atomic_read(&mddev->writes_pending)) { |
4379 | mddev->safemode = 1; | |
4380 | if (mddev->external) | |
00bcb4ac | 4381 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4382 | } |
1da177e4 LT |
4383 | md_wakeup_thread(mddev->thread); |
4384 | } | |
4385 | ||
6ff8d8ec | 4386 | static int start_dirty_degraded; |
1da177e4 | 4387 | |
390ee602 | 4388 | int md_run(mddev_t *mddev) |
1da177e4 | 4389 | { |
2604b703 | 4390 | int err; |
1da177e4 | 4391 | mdk_rdev_t *rdev; |
2604b703 | 4392 | struct mdk_personality *pers; |
1da177e4 | 4393 | |
a757e64c N |
4394 | if (list_empty(&mddev->disks)) |
4395 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4396 | return -EINVAL; |
1da177e4 LT |
4397 | |
4398 | if (mddev->pers) | |
4399 | return -EBUSY; | |
bb4f1e9d N |
4400 | /* Cannot run until previous stop completes properly */ |
4401 | if (mddev->sysfs_active) | |
4402 | return -EBUSY; | |
b6eb127d | 4403 | |
1da177e4 LT |
4404 | /* |
4405 | * Analyze all RAID superblock(s) | |
4406 | */ | |
1ec4a939 N |
4407 | if (!mddev->raid_disks) { |
4408 | if (!mddev->persistent) | |
4409 | return -EINVAL; | |
a757e64c | 4410 | analyze_sbs(mddev); |
1ec4a939 | 4411 | } |
1da177e4 | 4412 | |
d9d166c2 N |
4413 | if (mddev->level != LEVEL_NONE) |
4414 | request_module("md-level-%d", mddev->level); | |
4415 | else if (mddev->clevel[0]) | |
4416 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4417 | |
4418 | /* | |
4419 | * Drop all container device buffers, from now on | |
4420 | * the only valid external interface is through the md | |
4421 | * device. | |
1da177e4 | 4422 | */ |
159ec1fc | 4423 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4424 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4425 | continue; |
4426 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4427 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4428 | |
4429 | /* perform some consistency tests on the device. | |
4430 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4431 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4432 | */ |
0f420358 | 4433 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4434 | if (mddev->dev_sectors && |
4435 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4436 | > rdev->sb_start) { |
f0d76d70 N |
4437 | printk("md: %s: data overlaps metadata\n", |
4438 | mdname(mddev)); | |
4439 | return -EINVAL; | |
4440 | } | |
4441 | } else { | |
0f420358 | 4442 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4443 | > rdev->data_offset) { |
4444 | printk("md: %s: metadata overlaps data\n", | |
4445 | mdname(mddev)); | |
4446 | return -EINVAL; | |
4447 | } | |
4448 | } | |
00bcb4ac | 4449 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4450 | } |
4451 | ||
a167f663 N |
4452 | if (mddev->bio_set == NULL) |
4453 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev)); | |
4454 | ||
1da177e4 | 4455 | spin_lock(&pers_lock); |
d9d166c2 | 4456 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4457 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4458 | spin_unlock(&pers_lock); |
d9d166c2 N |
4459 | if (mddev->level != LEVEL_NONE) |
4460 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4461 | mddev->level); | |
4462 | else | |
4463 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4464 | mddev->clevel); | |
1da177e4 LT |
4465 | return -EINVAL; |
4466 | } | |
2604b703 | 4467 | mddev->pers = pers; |
1da177e4 | 4468 | spin_unlock(&pers_lock); |
34817e8c N |
4469 | if (mddev->level != pers->level) { |
4470 | mddev->level = pers->level; | |
4471 | mddev->new_level = pers->level; | |
4472 | } | |
d9d166c2 | 4473 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4474 | |
f6705578 | 4475 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4476 | pers->start_reshape == NULL) { |
f6705578 N |
4477 | /* This personality cannot handle reshaping... */ |
4478 | mddev->pers = NULL; | |
4479 | module_put(pers->owner); | |
4480 | return -EINVAL; | |
4481 | } | |
4482 | ||
7dd5e7c3 N |
4483 | if (pers->sync_request) { |
4484 | /* Warn if this is a potentially silly | |
4485 | * configuration. | |
4486 | */ | |
4487 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4488 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4489 | int warned = 0; |
159ec1fc CR |
4490 | |
4491 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4492 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4493 | if (rdev < rdev2 && |
4494 | rdev->bdev->bd_contains == | |
4495 | rdev2->bdev->bd_contains) { | |
4496 | printk(KERN_WARNING | |
4497 | "%s: WARNING: %s appears to be" | |
4498 | " on the same physical disk as" | |
4499 | " %s.\n", | |
4500 | mdname(mddev), | |
4501 | bdevname(rdev->bdev,b), | |
4502 | bdevname(rdev2->bdev,b2)); | |
4503 | warned = 1; | |
4504 | } | |
4505 | } | |
159ec1fc | 4506 | |
7dd5e7c3 N |
4507 | if (warned) |
4508 | printk(KERN_WARNING | |
4509 | "True protection against single-disk" | |
4510 | " failure might be compromised.\n"); | |
4511 | } | |
4512 | ||
657390d2 | 4513 | mddev->recovery = 0; |
58c0fed4 AN |
4514 | /* may be over-ridden by personality */ |
4515 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4516 | ||
6ff8d8ec | 4517 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4518 | |
0f9552b5 | 4519 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4520 | mddev->ro = 2; /* read-only, but switch on first write */ |
4521 | ||
b15c2e57 | 4522 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4523 | if (err) |
4524 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4525 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4526 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4527 | " but 'external_size' not in effect?\n", __func__); | |
4528 | printk(KERN_ERR | |
4529 | "md: invalid array_size %llu > default size %llu\n", | |
4530 | (unsigned long long)mddev->array_sectors / 2, | |
4531 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4532 | err = -EINVAL; | |
4533 | mddev->pers->stop(mddev); | |
4534 | } | |
4535 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4536 | err = bitmap_create(mddev); |
4537 | if (err) { | |
4538 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4539 | mdname(mddev), err); | |
4540 | mddev->pers->stop(mddev); | |
4541 | } | |
4542 | } | |
1da177e4 | 4543 | if (err) { |
1da177e4 LT |
4544 | module_put(mddev->pers->owner); |
4545 | mddev->pers = NULL; | |
32a7627c N |
4546 | bitmap_destroy(mddev); |
4547 | return err; | |
1da177e4 | 4548 | } |
5e55e2f5 | 4549 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4550 | if (mddev->kobj.sd && |
4551 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4552 | printk(KERN_WARNING |
4553 | "md: cannot register extra attributes for %s\n", | |
4554 | mdname(mddev)); | |
00bcb4ac | 4555 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4556 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4557 | mddev->ro = 0; |
4558 | ||
1da177e4 | 4559 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4560 | atomic_set(&mddev->max_corr_read_errors, |
4561 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4562 | mddev->safemode = 0; |
4563 | mddev->safemode_timer.function = md_safemode_timeout; | |
4564 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4565 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4566 | mddev->in_sync = 1; |
86e6ffdd | 4567 | |
159ec1fc | 4568 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4569 | if (rdev->raid_disk >= 0) { |
4570 | char nm[20]; | |
4571 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 | 4572 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
00bcb4ac | 4573 | /* failure here is OK */; |
86e6ffdd | 4574 | } |
1da177e4 LT |
4575 | |
4576 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4577 | ||
850b2b42 N |
4578 | if (mddev->flags) |
4579 | md_update_sb(mddev, 0); | |
1da177e4 | 4580 | |
0b8c9de0 N |
4581 | md_wakeup_thread(mddev->thread); |
4582 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4583 | |
d7603b7e | 4584 | md_new_event(mddev); |
00bcb4ac N |
4585 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4586 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4587 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4588 | return 0; |
4589 | } | |
390ee602 | 4590 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4591 | |
fe60b014 N |
4592 | static int do_md_run(mddev_t *mddev) |
4593 | { | |
4594 | int err; | |
4595 | ||
4596 | err = md_run(mddev); | |
4597 | if (err) | |
4598 | goto out; | |
69e51b44 N |
4599 | err = bitmap_load(mddev); |
4600 | if (err) { | |
4601 | bitmap_destroy(mddev); | |
4602 | goto out; | |
4603 | } | |
fe60b014 N |
4604 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4605 | revalidate_disk(mddev->gendisk); | |
4606 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); | |
4607 | out: | |
4608 | return err; | |
4609 | } | |
4610 | ||
1da177e4 LT |
4611 | static int restart_array(mddev_t *mddev) |
4612 | { | |
4613 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4614 | |
80fab1d7 | 4615 | /* Complain if it has no devices */ |
1da177e4 | 4616 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4617 | return -ENXIO; |
4618 | if (!mddev->pers) | |
4619 | return -EINVAL; | |
4620 | if (!mddev->ro) | |
4621 | return -EBUSY; | |
4622 | mddev->safemode = 0; | |
4623 | mddev->ro = 0; | |
4624 | set_disk_ro(disk, 0); | |
4625 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4626 | mdname(mddev)); | |
4627 | /* Kick recovery or resync if necessary */ | |
4628 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4629 | md_wakeup_thread(mddev->thread); | |
4630 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4631 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4632 | return 0; |
1da177e4 LT |
4633 | } |
4634 | ||
acc55e22 N |
4635 | /* similar to deny_write_access, but accounts for our holding a reference |
4636 | * to the file ourselves */ | |
4637 | static int deny_bitmap_write_access(struct file * file) | |
4638 | { | |
4639 | struct inode *inode = file->f_mapping->host; | |
4640 | ||
4641 | spin_lock(&inode->i_lock); | |
4642 | if (atomic_read(&inode->i_writecount) > 1) { | |
4643 | spin_unlock(&inode->i_lock); | |
4644 | return -ETXTBSY; | |
4645 | } | |
4646 | atomic_set(&inode->i_writecount, -1); | |
4647 | spin_unlock(&inode->i_lock); | |
4648 | ||
4649 | return 0; | |
4650 | } | |
4651 | ||
43a70507 | 4652 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4653 | { |
4654 | struct inode *inode = file->f_mapping->host; | |
4655 | ||
4656 | spin_lock(&inode->i_lock); | |
4657 | atomic_set(&inode->i_writecount, 1); | |
4658 | spin_unlock(&inode->i_lock); | |
4659 | } | |
4660 | ||
6177b472 N |
4661 | static void md_clean(mddev_t *mddev) |
4662 | { | |
4663 | mddev->array_sectors = 0; | |
4664 | mddev->external_size = 0; | |
4665 | mddev->dev_sectors = 0; | |
4666 | mddev->raid_disks = 0; | |
4667 | mddev->recovery_cp = 0; | |
4668 | mddev->resync_min = 0; | |
4669 | mddev->resync_max = MaxSector; | |
4670 | mddev->reshape_position = MaxSector; | |
4671 | mddev->external = 0; | |
4672 | mddev->persistent = 0; | |
4673 | mddev->level = LEVEL_NONE; | |
4674 | mddev->clevel[0] = 0; | |
4675 | mddev->flags = 0; | |
4676 | mddev->ro = 0; | |
4677 | mddev->metadata_type[0] = 0; | |
4678 | mddev->chunk_sectors = 0; | |
4679 | mddev->ctime = mddev->utime = 0; | |
4680 | mddev->layout = 0; | |
4681 | mddev->max_disks = 0; | |
4682 | mddev->events = 0; | |
a8707c08 | 4683 | mddev->can_decrease_events = 0; |
6177b472 N |
4684 | mddev->delta_disks = 0; |
4685 | mddev->new_level = LEVEL_NONE; | |
4686 | mddev->new_layout = 0; | |
4687 | mddev->new_chunk_sectors = 0; | |
4688 | mddev->curr_resync = 0; | |
4689 | mddev->resync_mismatches = 0; | |
4690 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4691 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4692 | mddev->recovery = 0; | |
4693 | mddev->in_sync = 0; | |
4694 | mddev->degraded = 0; | |
6177b472 N |
4695 | mddev->safemode = 0; |
4696 | mddev->bitmap_info.offset = 0; | |
4697 | mddev->bitmap_info.default_offset = 0; | |
4698 | mddev->bitmap_info.chunksize = 0; | |
4699 | mddev->bitmap_info.daemon_sleep = 0; | |
4700 | mddev->bitmap_info.max_write_behind = 0; | |
252ac522 | 4701 | mddev->plug = NULL; |
6177b472 N |
4702 | } |
4703 | ||
390ee602 | 4704 | void md_stop_writes(mddev_t *mddev) |
a047e125 N |
4705 | { |
4706 | if (mddev->sync_thread) { | |
4707 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4708 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4709 | md_unregister_thread(mddev->sync_thread); | |
4710 | mddev->sync_thread = NULL; | |
4711 | } | |
4712 | ||
4713 | del_timer_sync(&mddev->safemode_timer); | |
4714 | ||
4715 | bitmap_flush(mddev); | |
4716 | md_super_wait(mddev); | |
4717 | ||
4718 | if (!mddev->in_sync || mddev->flags) { | |
4719 | /* mark array as shutdown cleanly */ | |
4720 | mddev->in_sync = 1; | |
4721 | md_update_sb(mddev, 1); | |
4722 | } | |
4723 | } | |
390ee602 | 4724 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 4725 | |
390ee602 | 4726 | void md_stop(mddev_t *mddev) |
6177b472 N |
4727 | { |
4728 | mddev->pers->stop(mddev); | |
4729 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4730 | mddev->to_remove = &md_redundancy_group; | |
4731 | module_put(mddev->pers->owner); | |
4732 | mddev->pers = NULL; | |
cca9cf90 | 4733 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 4734 | } |
390ee602 | 4735 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 4736 | |
a4bd82d0 N |
4737 | static int md_set_readonly(mddev_t *mddev, int is_open) |
4738 | { | |
4739 | int err = 0; | |
4740 | mutex_lock(&mddev->open_mutex); | |
4741 | if (atomic_read(&mddev->openers) > is_open) { | |
4742 | printk("md: %s still in use.\n",mdname(mddev)); | |
4743 | err = -EBUSY; | |
4744 | goto out; | |
4745 | } | |
4746 | if (mddev->pers) { | |
4747 | md_stop_writes(mddev); | |
4748 | ||
4749 | err = -ENXIO; | |
4750 | if (mddev->ro==1) | |
4751 | goto out; | |
4752 | mddev->ro = 1; | |
4753 | set_disk_ro(mddev->gendisk, 1); | |
4754 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 4755 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
4756 | err = 0; |
4757 | } | |
4758 | out: | |
4759 | mutex_unlock(&mddev->open_mutex); | |
4760 | return err; | |
4761 | } | |
4762 | ||
9e653b63 N |
4763 | /* mode: |
4764 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
4765 | * 2 - stop but do not disassemble array |
4766 | */ | |
df5b20cf | 4767 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 | 4768 | { |
1da177e4 | 4769 | struct gendisk *disk = mddev->gendisk; |
c4647292 | 4770 | mdk_rdev_t *rdev; |
1da177e4 | 4771 | |
c8c00a69 | 4772 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
4773 | if (atomic_read(&mddev->openers) > is_open || |
4774 | mddev->sysfs_active) { | |
df5b20cf | 4775 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
4776 | mutex_unlock(&mddev->open_mutex); |
4777 | return -EBUSY; | |
4778 | } | |
1da177e4 | 4779 | |
6e17b027 | 4780 | if (mddev->pers) { |
a4bd82d0 N |
4781 | if (mddev->ro) |
4782 | set_disk_ro(disk, 0); | |
409c57f3 | 4783 | |
390ee602 | 4784 | md_stop_writes(mddev); |
a4bd82d0 N |
4785 | md_stop(mddev); |
4786 | mddev->queue->merge_bvec_fn = NULL; | |
4787 | mddev->queue->unplug_fn = NULL; | |
4788 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
6177b472 | 4789 | |
a4bd82d0 | 4790 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 4791 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 4792 | |
a4bd82d0 N |
4793 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4794 | if (rdev->raid_disk >= 0) { | |
4795 | char nm[20]; | |
4796 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4797 | sysfs_remove_link(&mddev->kobj, nm); | |
4798 | } | |
c4647292 | 4799 | |
a4bd82d0 | 4800 | set_capacity(disk, 0); |
6e17b027 | 4801 | mutex_unlock(&mddev->open_mutex); |
a4bd82d0 | 4802 | revalidate_disk(disk); |
0d4ca600 | 4803 | |
a4bd82d0 N |
4804 | if (mddev->ro) |
4805 | mddev->ro = 0; | |
6e17b027 N |
4806 | } else |
4807 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
4808 | /* |
4809 | * Free resources if final stop | |
4810 | */ | |
9e653b63 | 4811 | if (mode == 0) { |
1da177e4 LT |
4812 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4813 | ||
978f946b | 4814 | bitmap_destroy(mddev); |
c3d9714e N |
4815 | if (mddev->bitmap_info.file) { |
4816 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4817 | fput(mddev->bitmap_info.file); | |
4818 | mddev->bitmap_info.file = NULL; | |
978f946b | 4819 | } |
c3d9714e | 4820 | mddev->bitmap_info.offset = 0; |
978f946b | 4821 | |
1da177e4 LT |
4822 | export_array(mddev); |
4823 | ||
6177b472 | 4824 | md_clean(mddev); |
934d9c23 | 4825 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4826 | if (mddev->hold_active == UNTIL_STOP) |
4827 | mddev->hold_active = 0; | |
a4bd82d0 | 4828 | } |
3f9d99c1 | 4829 | blk_integrity_unregister(disk); |
d7603b7e | 4830 | md_new_event(mddev); |
00bcb4ac | 4831 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 4832 | return 0; |
1da177e4 LT |
4833 | } |
4834 | ||
fdee8ae4 | 4835 | #ifndef MODULE |
1da177e4 LT |
4836 | static void autorun_array(mddev_t *mddev) |
4837 | { | |
4838 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4839 | int err; |
4840 | ||
a757e64c | 4841 | if (list_empty(&mddev->disks)) |
1da177e4 | 4842 | return; |
1da177e4 LT |
4843 | |
4844 | printk(KERN_INFO "md: running: "); | |
4845 | ||
159ec1fc | 4846 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4847 | char b[BDEVNAME_SIZE]; |
4848 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4849 | } | |
4850 | printk("\n"); | |
4851 | ||
d710e138 | 4852 | err = do_md_run(mddev); |
1da177e4 LT |
4853 | if (err) { |
4854 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4855 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4856 | } |
4857 | } | |
4858 | ||
4859 | /* | |
4860 | * lets try to run arrays based on all disks that have arrived | |
4861 | * until now. (those are in pending_raid_disks) | |
4862 | * | |
4863 | * the method: pick the first pending disk, collect all disks with | |
4864 | * the same UUID, remove all from the pending list and put them into | |
4865 | * the 'same_array' list. Then order this list based on superblock | |
4866 | * update time (freshest comes first), kick out 'old' disks and | |
4867 | * compare superblocks. If everything's fine then run it. | |
4868 | * | |
4869 | * If "unit" is allocated, then bump its reference count | |
4870 | */ | |
4871 | static void autorun_devices(int part) | |
4872 | { | |
159ec1fc | 4873 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4874 | mddev_t *mddev; |
4875 | char b[BDEVNAME_SIZE]; | |
4876 | ||
4877 | printk(KERN_INFO "md: autorun ...\n"); | |
4878 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4879 | int unit; |
1da177e4 | 4880 | dev_t dev; |
ad01c9e3 | 4881 | LIST_HEAD(candidates); |
1da177e4 LT |
4882 | rdev0 = list_entry(pending_raid_disks.next, |
4883 | mdk_rdev_t, same_set); | |
4884 | ||
4885 | printk(KERN_INFO "md: considering %s ...\n", | |
4886 | bdevname(rdev0->bdev,b)); | |
4887 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4888 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4889 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4890 | printk(KERN_INFO "md: adding %s ...\n", | |
4891 | bdevname(rdev->bdev,b)); | |
4892 | list_move(&rdev->same_set, &candidates); | |
4893 | } | |
4894 | /* | |
4895 | * now we have a set of devices, with all of them having | |
4896 | * mostly sane superblocks. It's time to allocate the | |
4897 | * mddev. | |
4898 | */ | |
e8703fe1 N |
4899 | if (part) { |
4900 | dev = MKDEV(mdp_major, | |
4901 | rdev0->preferred_minor << MdpMinorShift); | |
4902 | unit = MINOR(dev) >> MdpMinorShift; | |
4903 | } else { | |
4904 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4905 | unit = MINOR(dev); | |
4906 | } | |
4907 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4908 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4909 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4910 | break; | |
4911 | } | |
1da177e4 LT |
4912 | |
4913 | md_probe(dev, NULL, NULL); | |
4914 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4915 | if (!mddev || !mddev->gendisk) { |
4916 | if (mddev) | |
4917 | mddev_put(mddev); | |
4918 | printk(KERN_ERR | |
1da177e4 LT |
4919 | "md: cannot allocate memory for md drive.\n"); |
4920 | break; | |
4921 | } | |
4922 | if (mddev_lock(mddev)) | |
4923 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4924 | mdname(mddev)); | |
4925 | else if (mddev->raid_disks || mddev->major_version | |
4926 | || !list_empty(&mddev->disks)) { | |
4927 | printk(KERN_WARNING | |
4928 | "md: %s already running, cannot run %s\n", | |
4929 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4930 | mddev_unlock(mddev); | |
4931 | } else { | |
4932 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4933 | mddev->persistent = 1; |
159ec1fc | 4934 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4935 | list_del_init(&rdev->same_set); |
4936 | if (bind_rdev_to_array(rdev, mddev)) | |
4937 | export_rdev(rdev); | |
4938 | } | |
4939 | autorun_array(mddev); | |
4940 | mddev_unlock(mddev); | |
4941 | } | |
4942 | /* on success, candidates will be empty, on error | |
4943 | * it won't... | |
4944 | */ | |
159ec1fc | 4945 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4946 | list_del_init(&rdev->same_set); |
1da177e4 | 4947 | export_rdev(rdev); |
4b80991c | 4948 | } |
1da177e4 LT |
4949 | mddev_put(mddev); |
4950 | } | |
4951 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4952 | } | |
fdee8ae4 | 4953 | #endif /* !MODULE */ |
1da177e4 | 4954 | |
1da177e4 LT |
4955 | static int get_version(void __user * arg) |
4956 | { | |
4957 | mdu_version_t ver; | |
4958 | ||
4959 | ver.major = MD_MAJOR_VERSION; | |
4960 | ver.minor = MD_MINOR_VERSION; | |
4961 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4962 | ||
4963 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4964 | return -EFAULT; | |
4965 | ||
4966 | return 0; | |
4967 | } | |
4968 | ||
4969 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4970 | { | |
4971 | mdu_array_info_t info; | |
a9f326eb | 4972 | int nr,working,insync,failed,spare; |
1da177e4 | 4973 | mdk_rdev_t *rdev; |
1da177e4 | 4974 | |
a9f326eb | 4975 | nr=working=insync=failed=spare=0; |
159ec1fc | 4976 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4977 | nr++; |
b2d444d7 | 4978 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4979 | failed++; |
4980 | else { | |
4981 | working++; | |
b2d444d7 | 4982 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 4983 | insync++; |
1da177e4 LT |
4984 | else |
4985 | spare++; | |
4986 | } | |
4987 | } | |
4988 | ||
4989 | info.major_version = mddev->major_version; | |
4990 | info.minor_version = mddev->minor_version; | |
4991 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4992 | info.ctime = mddev->ctime; | |
4993 | info.level = mddev->level; | |
58c0fed4 AN |
4994 | info.size = mddev->dev_sectors / 2; |
4995 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4996 | info.size = -1; |
1da177e4 LT |
4997 | info.nr_disks = nr; |
4998 | info.raid_disks = mddev->raid_disks; | |
4999 | info.md_minor = mddev->md_minor; | |
5000 | info.not_persistent= !mddev->persistent; | |
5001 | ||
5002 | info.utime = mddev->utime; | |
5003 | info.state = 0; | |
5004 | if (mddev->in_sync) | |
5005 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5006 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5007 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5008 | info.active_disks = insync; |
1da177e4 LT |
5009 | info.working_disks = working; |
5010 | info.failed_disks = failed; | |
5011 | info.spare_disks = spare; | |
5012 | ||
5013 | info.layout = mddev->layout; | |
9d8f0363 | 5014 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5015 | |
5016 | if (copy_to_user(arg, &info, sizeof(info))) | |
5017 | return -EFAULT; | |
5018 | ||
5019 | return 0; | |
5020 | } | |
5021 | ||
87162a28 | 5022 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
5023 | { |
5024 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5025 | char *ptr, *buf = NULL; | |
5026 | int err = -ENOMEM; | |
5027 | ||
b5470dc5 DW |
5028 | if (md_allow_write(mddev)) |
5029 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5030 | else | |
5031 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5032 | |
32a7627c N |
5033 | if (!file) |
5034 | goto out; | |
5035 | ||
5036 | /* bitmap disabled, zero the first byte and copy out */ | |
5037 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5038 | file->pathname[0] = '\0'; | |
5039 | goto copy_out; | |
5040 | } | |
5041 | ||
5042 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5043 | if (!buf) | |
5044 | goto out; | |
5045 | ||
6bcfd601 CH |
5046 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5047 | if (IS_ERR(ptr)) | |
32a7627c N |
5048 | goto out; |
5049 | ||
5050 | strcpy(file->pathname, ptr); | |
5051 | ||
5052 | copy_out: | |
5053 | err = 0; | |
5054 | if (copy_to_user(arg, file, sizeof(*file))) | |
5055 | err = -EFAULT; | |
5056 | out: | |
5057 | kfree(buf); | |
5058 | kfree(file); | |
5059 | return err; | |
5060 | } | |
5061 | ||
1da177e4 LT |
5062 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
5063 | { | |
5064 | mdu_disk_info_t info; | |
1da177e4 LT |
5065 | mdk_rdev_t *rdev; |
5066 | ||
5067 | if (copy_from_user(&info, arg, sizeof(info))) | |
5068 | return -EFAULT; | |
5069 | ||
26ef379f | 5070 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5071 | if (rdev) { |
5072 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5073 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5074 | info.raid_disk = rdev->raid_disk; | |
5075 | info.state = 0; | |
b2d444d7 | 5076 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5077 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5078 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5079 | info.state |= (1<<MD_DISK_ACTIVE); |
5080 | info.state |= (1<<MD_DISK_SYNC); | |
5081 | } | |
8ddf9efe N |
5082 | if (test_bit(WriteMostly, &rdev->flags)) |
5083 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5084 | } else { |
5085 | info.major = info.minor = 0; | |
5086 | info.raid_disk = -1; | |
5087 | info.state = (1<<MD_DISK_REMOVED); | |
5088 | } | |
5089 | ||
5090 | if (copy_to_user(arg, &info, sizeof(info))) | |
5091 | return -EFAULT; | |
5092 | ||
5093 | return 0; | |
5094 | } | |
5095 | ||
5096 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5097 | { | |
5098 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5099 | mdk_rdev_t *rdev; | |
5100 | dev_t dev = MKDEV(info->major,info->minor); | |
5101 | ||
5102 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5103 | return -EOVERFLOW; | |
5104 | ||
5105 | if (!mddev->raid_disks) { | |
5106 | int err; | |
5107 | /* expecting a device which has a superblock */ | |
5108 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5109 | if (IS_ERR(rdev)) { | |
5110 | printk(KERN_WARNING | |
5111 | "md: md_import_device returned %ld\n", | |
5112 | PTR_ERR(rdev)); | |
5113 | return PTR_ERR(rdev); | |
5114 | } | |
5115 | if (!list_empty(&mddev->disks)) { | |
5116 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5117 | mdk_rdev_t, same_set); | |
a9f326eb | 5118 | err = super_types[mddev->major_version] |
1da177e4 LT |
5119 | .load_super(rdev, rdev0, mddev->minor_version); |
5120 | if (err < 0) { | |
5121 | printk(KERN_WARNING | |
5122 | "md: %s has different UUID to %s\n", | |
5123 | bdevname(rdev->bdev,b), | |
5124 | bdevname(rdev0->bdev,b2)); | |
5125 | export_rdev(rdev); | |
5126 | return -EINVAL; | |
5127 | } | |
5128 | } | |
5129 | err = bind_rdev_to_array(rdev, mddev); | |
5130 | if (err) | |
5131 | export_rdev(rdev); | |
5132 | return err; | |
5133 | } | |
5134 | ||
5135 | /* | |
5136 | * add_new_disk can be used once the array is assembled | |
5137 | * to add "hot spares". They must already have a superblock | |
5138 | * written | |
5139 | */ | |
5140 | if (mddev->pers) { | |
5141 | int err; | |
5142 | if (!mddev->pers->hot_add_disk) { | |
5143 | printk(KERN_WARNING | |
5144 | "%s: personality does not support diskops!\n", | |
5145 | mdname(mddev)); | |
5146 | return -EINVAL; | |
5147 | } | |
7b1e35f6 N |
5148 | if (mddev->persistent) |
5149 | rdev = md_import_device(dev, mddev->major_version, | |
5150 | mddev->minor_version); | |
5151 | else | |
5152 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5153 | if (IS_ERR(rdev)) { |
5154 | printk(KERN_WARNING | |
5155 | "md: md_import_device returned %ld\n", | |
5156 | PTR_ERR(rdev)); | |
5157 | return PTR_ERR(rdev); | |
5158 | } | |
1a855a06 | 5159 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5160 | if (!mddev->persistent) { |
5161 | if (info->state & (1<<MD_DISK_SYNC) && | |
5162 | info->raid_disk < mddev->raid_disks) | |
5163 | rdev->raid_disk = info->raid_disk; | |
5164 | else | |
5165 | rdev->raid_disk = -1; | |
5166 | } else | |
5167 | super_types[mddev->major_version]. | |
5168 | validate_super(mddev, rdev); | |
1a855a06 N |
5169 | if (test_bit(In_sync, &rdev->flags)) |
5170 | rdev->saved_raid_disk = rdev->raid_disk; | |
5171 | else | |
5172 | rdev->saved_raid_disk = -1; | |
41158c7e | 5173 | |
b2d444d7 | 5174 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5175 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5176 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5177 | else |
5178 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5179 | |
1da177e4 LT |
5180 | rdev->raid_disk = -1; |
5181 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5182 | if (!err && !mddev->pers->hot_remove_disk) { |
5183 | /* If there is hot_add_disk but no hot_remove_disk | |
5184 | * then added disks for geometry changes, | |
5185 | * and should be added immediately. | |
5186 | */ | |
5187 | super_types[mddev->major_version]. | |
5188 | validate_super(mddev, rdev); | |
5189 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5190 | if (err) | |
5191 | unbind_rdev_from_array(rdev); | |
5192 | } | |
1da177e4 LT |
5193 | if (err) |
5194 | export_rdev(rdev); | |
52664732 | 5195 | else |
00bcb4ac | 5196 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5197 | |
17571284 | 5198 | md_update_sb(mddev, 1); |
72a23c21 NB |
5199 | if (mddev->degraded) |
5200 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5201 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 5202 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5203 | return err; |
5204 | } | |
5205 | ||
5206 | /* otherwise, add_new_disk is only allowed | |
5207 | * for major_version==0 superblocks | |
5208 | */ | |
5209 | if (mddev->major_version != 0) { | |
5210 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5211 | mdname(mddev)); | |
5212 | return -EINVAL; | |
5213 | } | |
5214 | ||
5215 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5216 | int err; | |
d710e138 | 5217 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5218 | if (IS_ERR(rdev)) { |
5219 | printk(KERN_WARNING | |
5220 | "md: error, md_import_device() returned %ld\n", | |
5221 | PTR_ERR(rdev)); | |
5222 | return PTR_ERR(rdev); | |
5223 | } | |
5224 | rdev->desc_nr = info->number; | |
5225 | if (info->raid_disk < mddev->raid_disks) | |
5226 | rdev->raid_disk = info->raid_disk; | |
5227 | else | |
5228 | rdev->raid_disk = -1; | |
5229 | ||
1da177e4 | 5230 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5231 | if (info->state & (1<<MD_DISK_SYNC)) |
5232 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5233 | |
8ddf9efe N |
5234 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5235 | set_bit(WriteMostly, &rdev->flags); | |
5236 | ||
1da177e4 LT |
5237 | if (!mddev->persistent) { |
5238 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5239 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5240 | } else | |
0f420358 | 5241 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
8190e754 | 5242 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5243 | |
2bf071bf N |
5244 | err = bind_rdev_to_array(rdev, mddev); |
5245 | if (err) { | |
5246 | export_rdev(rdev); | |
5247 | return err; | |
5248 | } | |
1da177e4 LT |
5249 | } |
5250 | ||
5251 | return 0; | |
5252 | } | |
5253 | ||
5254 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5255 | { | |
5256 | char b[BDEVNAME_SIZE]; | |
5257 | mdk_rdev_t *rdev; | |
5258 | ||
1da177e4 LT |
5259 | rdev = find_rdev(mddev, dev); |
5260 | if (!rdev) | |
5261 | return -ENXIO; | |
5262 | ||
5263 | if (rdev->raid_disk >= 0) | |
5264 | goto busy; | |
5265 | ||
5266 | kick_rdev_from_array(rdev); | |
850b2b42 | 5267 | md_update_sb(mddev, 1); |
d7603b7e | 5268 | md_new_event(mddev); |
1da177e4 LT |
5269 | |
5270 | return 0; | |
5271 | busy: | |
fdefa4d8 | 5272 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5273 | bdevname(rdev->bdev,b), mdname(mddev)); |
5274 | return -EBUSY; | |
5275 | } | |
5276 | ||
5277 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5278 | { | |
5279 | char b[BDEVNAME_SIZE]; | |
5280 | int err; | |
1da177e4 LT |
5281 | mdk_rdev_t *rdev; |
5282 | ||
5283 | if (!mddev->pers) | |
5284 | return -ENODEV; | |
5285 | ||
5286 | if (mddev->major_version != 0) { | |
5287 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5288 | " version-0 superblocks.\n", | |
5289 | mdname(mddev)); | |
5290 | return -EINVAL; | |
5291 | } | |
5292 | if (!mddev->pers->hot_add_disk) { | |
5293 | printk(KERN_WARNING | |
5294 | "%s: personality does not support diskops!\n", | |
5295 | mdname(mddev)); | |
5296 | return -EINVAL; | |
5297 | } | |
5298 | ||
d710e138 | 5299 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5300 | if (IS_ERR(rdev)) { |
5301 | printk(KERN_WARNING | |
5302 | "md: error, md_import_device() returned %ld\n", | |
5303 | PTR_ERR(rdev)); | |
5304 | return -EINVAL; | |
5305 | } | |
5306 | ||
5307 | if (mddev->persistent) | |
0f420358 | 5308 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 5309 | else |
77304d2a | 5310 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5311 | |
8190e754 | 5312 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5313 | |
b2d444d7 | 5314 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5315 | printk(KERN_WARNING |
5316 | "md: can not hot-add faulty %s disk to %s!\n", | |
5317 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5318 | err = -EINVAL; | |
5319 | goto abort_export; | |
5320 | } | |
b2d444d7 | 5321 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5322 | rdev->desc_nr = -1; |
5842730d | 5323 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5324 | err = bind_rdev_to_array(rdev, mddev); |
5325 | if (err) | |
5326 | goto abort_export; | |
1da177e4 LT |
5327 | |
5328 | /* | |
5329 | * The rest should better be atomic, we can have disk failures | |
5330 | * noticed in interrupt contexts ... | |
5331 | */ | |
5332 | ||
1da177e4 LT |
5333 | rdev->raid_disk = -1; |
5334 | ||
850b2b42 | 5335 | md_update_sb(mddev, 1); |
1da177e4 LT |
5336 | |
5337 | /* | |
5338 | * Kick recovery, maybe this spare has to be added to the | |
5339 | * array immediately. | |
5340 | */ | |
5341 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5342 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5343 | md_new_event(mddev); |
1da177e4 LT |
5344 | return 0; |
5345 | ||
1da177e4 LT |
5346 | abort_export: |
5347 | export_rdev(rdev); | |
5348 | return err; | |
5349 | } | |
5350 | ||
32a7627c N |
5351 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5352 | { | |
5353 | int err; | |
5354 | ||
36fa3063 N |
5355 | if (mddev->pers) { |
5356 | if (!mddev->pers->quiesce) | |
5357 | return -EBUSY; | |
5358 | if (mddev->recovery || mddev->sync_thread) | |
5359 | return -EBUSY; | |
5360 | /* we should be able to change the bitmap.. */ | |
5361 | } | |
32a7627c | 5362 | |
32a7627c | 5363 | |
36fa3063 N |
5364 | if (fd >= 0) { |
5365 | if (mddev->bitmap) | |
5366 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5367 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5368 | |
c3d9714e | 5369 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5370 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5371 | mdname(mddev)); | |
5372 | return -EBADF; | |
5373 | } | |
5374 | ||
c3d9714e | 5375 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5376 | if (err) { |
5377 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5378 | mdname(mddev)); | |
c3d9714e N |
5379 | fput(mddev->bitmap_info.file); |
5380 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5381 | return err; |
5382 | } | |
c3d9714e | 5383 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5384 | } else if (mddev->bitmap == NULL) |
5385 | return -ENOENT; /* cannot remove what isn't there */ | |
5386 | err = 0; | |
5387 | if (mddev->pers) { | |
5388 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5389 | if (fd >= 0) { |
36fa3063 | 5390 | err = bitmap_create(mddev); |
69e51b44 N |
5391 | if (!err) |
5392 | err = bitmap_load(mddev); | |
5393 | } | |
d7375ab3 | 5394 | if (fd < 0 || err) { |
36fa3063 | 5395 | bitmap_destroy(mddev); |
d7375ab3 N |
5396 | fd = -1; /* make sure to put the file */ |
5397 | } | |
36fa3063 | 5398 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5399 | } |
5400 | if (fd < 0) { | |
c3d9714e N |
5401 | if (mddev->bitmap_info.file) { |
5402 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5403 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5404 | } |
c3d9714e | 5405 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5406 | } |
5407 | ||
32a7627c N |
5408 | return err; |
5409 | } | |
5410 | ||
1da177e4 LT |
5411 | /* |
5412 | * set_array_info is used two different ways | |
5413 | * The original usage is when creating a new array. | |
5414 | * In this usage, raid_disks is > 0 and it together with | |
5415 | * level, size, not_persistent,layout,chunksize determine the | |
5416 | * shape of the array. | |
5417 | * This will always create an array with a type-0.90.0 superblock. | |
5418 | * The newer usage is when assembling an array. | |
5419 | * In this case raid_disks will be 0, and the major_version field is | |
5420 | * use to determine which style super-blocks are to be found on the devices. | |
5421 | * The minor and patch _version numbers are also kept incase the | |
5422 | * super_block handler wishes to interpret them. | |
5423 | */ | |
5424 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5425 | { | |
5426 | ||
5427 | if (info->raid_disks == 0) { | |
5428 | /* just setting version number for superblock loading */ | |
5429 | if (info->major_version < 0 || | |
50511da3 | 5430 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5431 | super_types[info->major_version].name == NULL) { |
5432 | /* maybe try to auto-load a module? */ | |
5433 | printk(KERN_INFO | |
5434 | "md: superblock version %d not known\n", | |
5435 | info->major_version); | |
5436 | return -EINVAL; | |
5437 | } | |
5438 | mddev->major_version = info->major_version; | |
5439 | mddev->minor_version = info->minor_version; | |
5440 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5441 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5442 | /* ensure mddev_put doesn't delete this now that there |
5443 | * is some minimal configuration. | |
5444 | */ | |
5445 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5446 | return 0; |
5447 | } | |
5448 | mddev->major_version = MD_MAJOR_VERSION; | |
5449 | mddev->minor_version = MD_MINOR_VERSION; | |
5450 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5451 | mddev->ctime = get_seconds(); | |
5452 | ||
5453 | mddev->level = info->level; | |
17115e03 | 5454 | mddev->clevel[0] = 0; |
58c0fed4 | 5455 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5456 | mddev->raid_disks = info->raid_disks; |
5457 | /* don't set md_minor, it is determined by which /dev/md* was | |
5458 | * openned | |
5459 | */ | |
5460 | if (info->state & (1<<MD_SB_CLEAN)) | |
5461 | mddev->recovery_cp = MaxSector; | |
5462 | else | |
5463 | mddev->recovery_cp = 0; | |
5464 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5465 | mddev->external = 0; |
1da177e4 LT |
5466 | |
5467 | mddev->layout = info->layout; | |
9d8f0363 | 5468 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5469 | |
5470 | mddev->max_disks = MD_SB_DISKS; | |
5471 | ||
e691063a N |
5472 | if (mddev->persistent) |
5473 | mddev->flags = 0; | |
850b2b42 | 5474 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5475 | |
c3d9714e N |
5476 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5477 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5478 | |
f6705578 N |
5479 | mddev->reshape_position = MaxSector; |
5480 | ||
1da177e4 LT |
5481 | /* |
5482 | * Generate a 128 bit UUID | |
5483 | */ | |
5484 | get_random_bytes(mddev->uuid, 16); | |
5485 | ||
f6705578 | 5486 | mddev->new_level = mddev->level; |
664e7c41 | 5487 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5488 | mddev->new_layout = mddev->layout; |
5489 | mddev->delta_disks = 0; | |
5490 | ||
1da177e4 LT |
5491 | return 0; |
5492 | } | |
5493 | ||
1f403624 DW |
5494 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5495 | { | |
b522adcd DW |
5496 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5497 | ||
5498 | if (mddev->external_size) | |
5499 | return; | |
5500 | ||
1f403624 DW |
5501 | mddev->array_sectors = array_sectors; |
5502 | } | |
5503 | EXPORT_SYMBOL(md_set_array_sectors); | |
5504 | ||
d71f9f88 | 5505 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5506 | { |
159ec1fc | 5507 | mdk_rdev_t *rdev; |
a35b0d69 | 5508 | int rv; |
d71f9f88 | 5509 | int fit = (num_sectors == 0); |
a35b0d69 N |
5510 | |
5511 | if (mddev->pers->resize == NULL) | |
5512 | return -EINVAL; | |
d71f9f88 AN |
5513 | /* The "num_sectors" is the number of sectors of each device that |
5514 | * is used. This can only make sense for arrays with redundancy. | |
5515 | * linear and raid0 always use whatever space is available. We can only | |
5516 | * consider changing this number if no resync or reconstruction is | |
5517 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5518 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5519 | * of each device. If num_sectors is zero, we find the largest size |
5520 | * that fits. | |
5521 | ||
a35b0d69 N |
5522 | */ |
5523 | if (mddev->sync_thread) | |
5524 | return -EBUSY; | |
dba034ee N |
5525 | if (mddev->bitmap) |
5526 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5527 | * grow, and re-add. | |
5528 | */ | |
5529 | return -EBUSY; | |
159ec1fc | 5530 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5531 | sector_t avail = rdev->sectors; |
01ab5662 | 5532 | |
d71f9f88 AN |
5533 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5534 | num_sectors = avail; | |
5535 | if (avail < num_sectors) | |
a35b0d69 N |
5536 | return -ENOSPC; |
5537 | } | |
d71f9f88 | 5538 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5539 | if (!rv) |
5540 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5541 | return rv; |
5542 | } | |
5543 | ||
da943b99 N |
5544 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5545 | { | |
5546 | int rv; | |
5547 | /* change the number of raid disks */ | |
63c70c4f | 5548 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5549 | return -EINVAL; |
5550 | if (raid_disks <= 0 || | |
233fca36 | 5551 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5552 | return -EINVAL; |
63c70c4f | 5553 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5554 | return -EBUSY; |
63c70c4f N |
5555 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5556 | ||
5557 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5558 | return rv; |
5559 | } | |
5560 | ||
5561 | ||
1da177e4 LT |
5562 | /* |
5563 | * update_array_info is used to change the configuration of an | |
5564 | * on-line array. | |
5565 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5566 | * fields in the info are checked against the array. | |
5567 | * Any differences that cannot be handled will cause an error. | |
5568 | * Normally, only one change can be managed at a time. | |
5569 | */ | |
5570 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5571 | { | |
5572 | int rv = 0; | |
5573 | int cnt = 0; | |
36fa3063 N |
5574 | int state = 0; |
5575 | ||
5576 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5577 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5578 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5579 | |
5580 | if (mddev->major_version != info->major_version || | |
5581 | mddev->minor_version != info->minor_version || | |
5582 | /* mddev->patch_version != info->patch_version || */ | |
5583 | mddev->ctime != info->ctime || | |
5584 | mddev->level != info->level || | |
5585 | /* mddev->layout != info->layout || */ | |
5586 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5587 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5588 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5589 | ((state^info->state) & 0xfffffe00) | |
5590 | ) | |
1da177e4 LT |
5591 | return -EINVAL; |
5592 | /* Check there is only one change */ | |
58c0fed4 AN |
5593 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5594 | cnt++; | |
5595 | if (mddev->raid_disks != info->raid_disks) | |
5596 | cnt++; | |
5597 | if (mddev->layout != info->layout) | |
5598 | cnt++; | |
5599 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5600 | cnt++; | |
5601 | if (cnt == 0) | |
5602 | return 0; | |
5603 | if (cnt > 1) | |
5604 | return -EINVAL; | |
1da177e4 LT |
5605 | |
5606 | if (mddev->layout != info->layout) { | |
5607 | /* Change layout | |
5608 | * we don't need to do anything at the md level, the | |
5609 | * personality will take care of it all. | |
5610 | */ | |
50ac168a | 5611 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5612 | return -EINVAL; |
597a711b N |
5613 | else { |
5614 | mddev->new_layout = info->layout; | |
50ac168a | 5615 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5616 | if (rv) |
5617 | mddev->new_layout = mddev->layout; | |
5618 | return rv; | |
5619 | } | |
1da177e4 | 5620 | } |
58c0fed4 | 5621 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5622 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5623 | |
da943b99 N |
5624 | if (mddev->raid_disks != info->raid_disks) |
5625 | rv = update_raid_disks(mddev, info->raid_disks); | |
5626 | ||
36fa3063 N |
5627 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5628 | if (mddev->pers->quiesce == NULL) | |
5629 | return -EINVAL; | |
5630 | if (mddev->recovery || mddev->sync_thread) | |
5631 | return -EBUSY; | |
5632 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5633 | /* add the bitmap */ | |
5634 | if (mddev->bitmap) | |
5635 | return -EEXIST; | |
c3d9714e | 5636 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5637 | return -EINVAL; |
c3d9714e N |
5638 | mddev->bitmap_info.offset = |
5639 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5640 | mddev->pers->quiesce(mddev, 1); |
5641 | rv = bitmap_create(mddev); | |
69e51b44 N |
5642 | if (!rv) |
5643 | rv = bitmap_load(mddev); | |
36fa3063 N |
5644 | if (rv) |
5645 | bitmap_destroy(mddev); | |
5646 | mddev->pers->quiesce(mddev, 0); | |
5647 | } else { | |
5648 | /* remove the bitmap */ | |
5649 | if (!mddev->bitmap) | |
5650 | return -ENOENT; | |
5651 | if (mddev->bitmap->file) | |
5652 | return -EINVAL; | |
5653 | mddev->pers->quiesce(mddev, 1); | |
5654 | bitmap_destroy(mddev); | |
5655 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5656 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5657 | } |
5658 | } | |
850b2b42 | 5659 | md_update_sb(mddev, 1); |
1da177e4 LT |
5660 | return rv; |
5661 | } | |
5662 | ||
5663 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5664 | { | |
5665 | mdk_rdev_t *rdev; | |
5666 | ||
5667 | if (mddev->pers == NULL) | |
5668 | return -ENODEV; | |
5669 | ||
5670 | rdev = find_rdev(mddev, dev); | |
5671 | if (!rdev) | |
5672 | return -ENODEV; | |
5673 | ||
5674 | md_error(mddev, rdev); | |
5675 | return 0; | |
5676 | } | |
5677 | ||
2f9618ce AN |
5678 | /* |
5679 | * We have a problem here : there is no easy way to give a CHS | |
5680 | * virtual geometry. We currently pretend that we have a 2 heads | |
5681 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5682 | * dosfs just mad... ;-) | |
5683 | */ | |
a885c8c4 CH |
5684 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5685 | { | |
5686 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5687 | ||
5688 | geo->heads = 2; | |
5689 | geo->sectors = 4; | |
49ce6cea | 5690 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5691 | return 0; |
5692 | } | |
5693 | ||
a39907fa | 5694 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5695 | unsigned int cmd, unsigned long arg) |
5696 | { | |
5697 | int err = 0; | |
5698 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5699 | mddev_t *mddev = NULL; |
e2218350 | 5700 | int ro; |
1da177e4 LT |
5701 | |
5702 | if (!capable(CAP_SYS_ADMIN)) | |
5703 | return -EACCES; | |
5704 | ||
5705 | /* | |
5706 | * Commands dealing with the RAID driver but not any | |
5707 | * particular array: | |
5708 | */ | |
5709 | switch (cmd) | |
5710 | { | |
5711 | case RAID_VERSION: | |
5712 | err = get_version(argp); | |
5713 | goto done; | |
5714 | ||
5715 | case PRINT_RAID_DEBUG: | |
5716 | err = 0; | |
5717 | md_print_devices(); | |
5718 | goto done; | |
5719 | ||
5720 | #ifndef MODULE | |
5721 | case RAID_AUTORUN: | |
5722 | err = 0; | |
5723 | autostart_arrays(arg); | |
5724 | goto done; | |
5725 | #endif | |
5726 | default:; | |
5727 | } | |
5728 | ||
5729 | /* | |
5730 | * Commands creating/starting a new array: | |
5731 | */ | |
5732 | ||
a39907fa | 5733 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5734 | |
5735 | if (!mddev) { | |
5736 | BUG(); | |
5737 | goto abort; | |
5738 | } | |
5739 | ||
1da177e4 LT |
5740 | err = mddev_lock(mddev); |
5741 | if (err) { | |
5742 | printk(KERN_INFO | |
5743 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5744 | err, cmd); | |
5745 | goto abort; | |
5746 | } | |
5747 | ||
5748 | switch (cmd) | |
5749 | { | |
5750 | case SET_ARRAY_INFO: | |
5751 | { | |
5752 | mdu_array_info_t info; | |
5753 | if (!arg) | |
5754 | memset(&info, 0, sizeof(info)); | |
5755 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5756 | err = -EFAULT; | |
5757 | goto abort_unlock; | |
5758 | } | |
5759 | if (mddev->pers) { | |
5760 | err = update_array_info(mddev, &info); | |
5761 | if (err) { | |
5762 | printk(KERN_WARNING "md: couldn't update" | |
5763 | " array info. %d\n", err); | |
5764 | goto abort_unlock; | |
5765 | } | |
5766 | goto done_unlock; | |
5767 | } | |
5768 | if (!list_empty(&mddev->disks)) { | |
5769 | printk(KERN_WARNING | |
5770 | "md: array %s already has disks!\n", | |
5771 | mdname(mddev)); | |
5772 | err = -EBUSY; | |
5773 | goto abort_unlock; | |
5774 | } | |
5775 | if (mddev->raid_disks) { | |
5776 | printk(KERN_WARNING | |
5777 | "md: array %s already initialised!\n", | |
5778 | mdname(mddev)); | |
5779 | err = -EBUSY; | |
5780 | goto abort_unlock; | |
5781 | } | |
5782 | err = set_array_info(mddev, &info); | |
5783 | if (err) { | |
5784 | printk(KERN_WARNING "md: couldn't set" | |
5785 | " array info. %d\n", err); | |
5786 | goto abort_unlock; | |
5787 | } | |
5788 | } | |
5789 | goto done_unlock; | |
5790 | ||
5791 | default:; | |
5792 | } | |
5793 | ||
5794 | /* | |
5795 | * Commands querying/configuring an existing array: | |
5796 | */ | |
32a7627c | 5797 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5798 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5799 | if ((!mddev->raid_disks && !mddev->external) |
5800 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5801 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5802 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5803 | err = -ENODEV; |
5804 | goto abort_unlock; | |
5805 | } | |
5806 | ||
5807 | /* | |
5808 | * Commands even a read-only array can execute: | |
5809 | */ | |
5810 | switch (cmd) | |
5811 | { | |
5812 | case GET_ARRAY_INFO: | |
5813 | err = get_array_info(mddev, argp); | |
5814 | goto done_unlock; | |
5815 | ||
32a7627c | 5816 | case GET_BITMAP_FILE: |
87162a28 | 5817 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5818 | goto done_unlock; |
5819 | ||
1da177e4 LT |
5820 | case GET_DISK_INFO: |
5821 | err = get_disk_info(mddev, argp); | |
5822 | goto done_unlock; | |
5823 | ||
5824 | case RESTART_ARRAY_RW: | |
5825 | err = restart_array(mddev); | |
5826 | goto done_unlock; | |
5827 | ||
5828 | case STOP_ARRAY: | |
d710e138 | 5829 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5830 | goto done_unlock; |
5831 | ||
5832 | case STOP_ARRAY_RO: | |
a4bd82d0 | 5833 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
5834 | goto done_unlock; |
5835 | ||
e2218350 DW |
5836 | case BLKROSET: |
5837 | if (get_user(ro, (int __user *)(arg))) { | |
5838 | err = -EFAULT; | |
5839 | goto done_unlock; | |
5840 | } | |
5841 | err = -EINVAL; | |
5842 | ||
5843 | /* if the bdev is going readonly the value of mddev->ro | |
5844 | * does not matter, no writes are coming | |
5845 | */ | |
5846 | if (ro) | |
5847 | goto done_unlock; | |
5848 | ||
5849 | /* are we are already prepared for writes? */ | |
5850 | if (mddev->ro != 1) | |
5851 | goto done_unlock; | |
5852 | ||
5853 | /* transitioning to readauto need only happen for | |
5854 | * arrays that call md_write_start | |
5855 | */ | |
5856 | if (mddev->pers) { | |
5857 | err = restart_array(mddev); | |
5858 | if (err == 0) { | |
5859 | mddev->ro = 2; | |
5860 | set_disk_ro(mddev->gendisk, 0); | |
5861 | } | |
5862 | } | |
5863 | goto done_unlock; | |
1da177e4 LT |
5864 | } |
5865 | ||
5866 | /* | |
5867 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5868 | * superblock, so we do not allow them on read-only arrays. |
5869 | * However non-MD ioctls (e.g. get-size) will still come through | |
5870 | * here and hit the 'default' below, so only disallow | |
5871 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5872 | */ |
bb57fc64 | 5873 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5874 | if (mddev->ro == 2) { |
5875 | mddev->ro = 0; | |
00bcb4ac | 5876 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
5877 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5878 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5879 | } else { |
5880 | err = -EROFS; | |
5881 | goto abort_unlock; | |
5882 | } | |
1da177e4 LT |
5883 | } |
5884 | ||
5885 | switch (cmd) | |
5886 | { | |
5887 | case ADD_NEW_DISK: | |
5888 | { | |
5889 | mdu_disk_info_t info; | |
5890 | if (copy_from_user(&info, argp, sizeof(info))) | |
5891 | err = -EFAULT; | |
5892 | else | |
5893 | err = add_new_disk(mddev, &info); | |
5894 | goto done_unlock; | |
5895 | } | |
5896 | ||
5897 | case HOT_REMOVE_DISK: | |
5898 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5899 | goto done_unlock; | |
5900 | ||
5901 | case HOT_ADD_DISK: | |
5902 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5903 | goto done_unlock; | |
5904 | ||
5905 | case SET_DISK_FAULTY: | |
5906 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5907 | goto done_unlock; | |
5908 | ||
5909 | case RUN_ARRAY: | |
d710e138 | 5910 | err = do_md_run(mddev); |
1da177e4 LT |
5911 | goto done_unlock; |
5912 | ||
32a7627c N |
5913 | case SET_BITMAP_FILE: |
5914 | err = set_bitmap_file(mddev, (int)arg); | |
5915 | goto done_unlock; | |
5916 | ||
1da177e4 | 5917 | default: |
1da177e4 LT |
5918 | err = -EINVAL; |
5919 | goto abort_unlock; | |
5920 | } | |
5921 | ||
5922 | done_unlock: | |
5923 | abort_unlock: | |
d3374825 N |
5924 | if (mddev->hold_active == UNTIL_IOCTL && |
5925 | err != -EINVAL) | |
5926 | mddev->hold_active = 0; | |
1da177e4 LT |
5927 | mddev_unlock(mddev); |
5928 | ||
5929 | return err; | |
5930 | done: | |
5931 | if (err) | |
5932 | MD_BUG(); | |
5933 | abort: | |
5934 | return err; | |
5935 | } | |
aa98aa31 AB |
5936 | #ifdef CONFIG_COMPAT |
5937 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
5938 | unsigned int cmd, unsigned long arg) | |
5939 | { | |
5940 | switch (cmd) { | |
5941 | case HOT_REMOVE_DISK: | |
5942 | case HOT_ADD_DISK: | |
5943 | case SET_DISK_FAULTY: | |
5944 | case SET_BITMAP_FILE: | |
5945 | /* These take in integer arg, do not convert */ | |
5946 | break; | |
5947 | default: | |
5948 | arg = (unsigned long)compat_ptr(arg); | |
5949 | break; | |
5950 | } | |
5951 | ||
5952 | return md_ioctl(bdev, mode, cmd, arg); | |
5953 | } | |
5954 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 5955 | |
a39907fa | 5956 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5957 | { |
5958 | /* | |
5959 | * Succeed if we can lock the mddev, which confirms that | |
5960 | * it isn't being stopped right now. | |
5961 | */ | |
d3374825 | 5962 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5963 | int err; |
5964 | ||
d3374825 N |
5965 | if (mddev->gendisk != bdev->bd_disk) { |
5966 | /* we are racing with mddev_put which is discarding this | |
5967 | * bd_disk. | |
5968 | */ | |
5969 | mddev_put(mddev); | |
5970 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 5971 | flush_workqueue(md_misc_wq); |
d3374825 N |
5972 | /* Then retry the open from the top */ |
5973 | return -ERESTARTSYS; | |
5974 | } | |
5975 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5976 | ||
c8c00a69 | 5977 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
5978 | goto out; |
5979 | ||
5980 | err = 0; | |
f2ea68cf | 5981 | atomic_inc(&mddev->openers); |
c8c00a69 | 5982 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 5983 | |
f3b99be1 | 5984 | check_disk_size_change(mddev->gendisk, bdev); |
1da177e4 LT |
5985 | out: |
5986 | return err; | |
5987 | } | |
5988 | ||
a39907fa | 5989 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5990 | { |
a39907fa | 5991 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5992 | |
52e5f9d1 | 5993 | BUG_ON(!mddev); |
f2ea68cf | 5994 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5995 | mddev_put(mddev); |
5996 | ||
5997 | return 0; | |
5998 | } | |
83d5cde4 | 5999 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6000 | { |
6001 | .owner = THIS_MODULE, | |
a39907fa AV |
6002 | .open = md_open, |
6003 | .release = md_release, | |
b492b852 | 6004 | .ioctl = md_ioctl, |
aa98aa31 AB |
6005 | #ifdef CONFIG_COMPAT |
6006 | .compat_ioctl = md_compat_ioctl, | |
6007 | #endif | |
a885c8c4 | 6008 | .getgeo = md_getgeo, |
1da177e4 LT |
6009 | }; |
6010 | ||
75c96f85 | 6011 | static int md_thread(void * arg) |
1da177e4 LT |
6012 | { |
6013 | mdk_thread_t *thread = arg; | |
6014 | ||
1da177e4 LT |
6015 | /* |
6016 | * md_thread is a 'system-thread', it's priority should be very | |
6017 | * high. We avoid resource deadlocks individually in each | |
6018 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6019 | * the very same RT priority as kswapd, thus we will never get | |
6020 | * into a priority inversion deadlock. | |
6021 | * | |
6022 | * we definitely have to have equal or higher priority than | |
6023 | * bdflush, otherwise bdflush will deadlock if there are too | |
6024 | * many dirty RAID5 blocks. | |
6025 | */ | |
1da177e4 | 6026 | |
6985c43f | 6027 | allow_signal(SIGKILL); |
a6fb0934 | 6028 | while (!kthread_should_stop()) { |
1da177e4 | 6029 | |
93588e22 N |
6030 | /* We need to wait INTERRUPTIBLE so that |
6031 | * we don't add to the load-average. | |
6032 | * That means we need to be sure no signals are | |
6033 | * pending | |
6034 | */ | |
6035 | if (signal_pending(current)) | |
6036 | flush_signals(current); | |
6037 | ||
6038 | wait_event_interruptible_timeout | |
6039 | (thread->wqueue, | |
6040 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6041 | || kthread_should_stop(), | |
6042 | thread->timeout); | |
1da177e4 | 6043 | |
589a594b N |
6044 | if (test_and_clear_bit(THREAD_WAKEUP, &thread->flags)) |
6045 | thread->run(thread->mddev); | |
1da177e4 | 6046 | } |
a6fb0934 | 6047 | |
1da177e4 LT |
6048 | return 0; |
6049 | } | |
6050 | ||
6051 | void md_wakeup_thread(mdk_thread_t *thread) | |
6052 | { | |
6053 | if (thread) { | |
6054 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
6055 | set_bit(THREAD_WAKEUP, &thread->flags); | |
6056 | wake_up(&thread->wqueue); | |
6057 | } | |
6058 | } | |
6059 | ||
6060 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
6061 | const char *name) | |
6062 | { | |
6063 | mdk_thread_t *thread; | |
1da177e4 | 6064 | |
9ffae0cf | 6065 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
6066 | if (!thread) |
6067 | return NULL; | |
6068 | ||
1da177e4 LT |
6069 | init_waitqueue_head(&thread->wqueue); |
6070 | ||
1da177e4 LT |
6071 | thread->run = run; |
6072 | thread->mddev = mddev; | |
32a7627c | 6073 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6074 | thread->tsk = kthread_run(md_thread, thread, |
6075 | "%s_%s", | |
6076 | mdname(thread->mddev), | |
6077 | name ?: mddev->pers->name); | |
a6fb0934 | 6078 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6079 | kfree(thread); |
6080 | return NULL; | |
6081 | } | |
1da177e4 LT |
6082 | return thread; |
6083 | } | |
6084 | ||
1da177e4 LT |
6085 | void md_unregister_thread(mdk_thread_t *thread) |
6086 | { | |
e0cf8f04 N |
6087 | if (!thread) |
6088 | return; | |
ba25f9dc | 6089 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6090 | |
6091 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6092 | kfree(thread); |
6093 | } | |
6094 | ||
6095 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6096 | { | |
6097 | if (!mddev) { | |
6098 | MD_BUG(); | |
6099 | return; | |
6100 | } | |
6101 | ||
b2d444d7 | 6102 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6103 | return; |
6bfe0b49 DW |
6104 | |
6105 | if (mddev->external) | |
6106 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6107 | /* |
1da177e4 LT |
6108 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6109 | mdname(mddev), | |
6110 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6111 | __builtin_return_address(0),__builtin_return_address(1), | |
6112 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6113 | */ |
d0a0a5ee AM |
6114 | if (!mddev->pers) |
6115 | return; | |
1da177e4 LT |
6116 | if (!mddev->pers->error_handler) |
6117 | return; | |
6118 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6119 | if (mddev->degraded) |
6120 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6121 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6122 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6123 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6124 | md_wakeup_thread(mddev->thread); | |
768a418d | 6125 | if (mddev->event_work.func) |
e804ac78 | 6126 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6127 | md_new_event_inintr(mddev); |
1da177e4 LT |
6128 | } |
6129 | ||
6130 | /* seq_file implementation /proc/mdstat */ | |
6131 | ||
6132 | static void status_unused(struct seq_file *seq) | |
6133 | { | |
6134 | int i = 0; | |
6135 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6136 | |
6137 | seq_printf(seq, "unused devices: "); | |
6138 | ||
159ec1fc | 6139 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6140 | char b[BDEVNAME_SIZE]; |
6141 | i++; | |
6142 | seq_printf(seq, "%s ", | |
6143 | bdevname(rdev->bdev,b)); | |
6144 | } | |
6145 | if (!i) | |
6146 | seq_printf(seq, "<none>"); | |
6147 | ||
6148 | seq_printf(seq, "\n"); | |
6149 | } | |
6150 | ||
6151 | ||
6152 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6153 | { | |
dd71cf6b N |
6154 | sector_t max_sectors, resync, res; |
6155 | unsigned long dt, db; | |
6156 | sector_t rt; | |
4588b42e N |
6157 | int scale; |
6158 | unsigned int per_milli; | |
1da177e4 | 6159 | |
dd71cf6b | 6160 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6161 | |
6162 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6163 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6164 | else |
dd71cf6b | 6165 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6166 | |
6167 | /* | |
6168 | * Should not happen. | |
6169 | */ | |
dd71cf6b | 6170 | if (!max_sectors) { |
1da177e4 LT |
6171 | MD_BUG(); |
6172 | return; | |
6173 | } | |
4588b42e | 6174 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6175 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6176 | * u32, as those are the requirements for sector_div. |
6177 | * Thus 'scale' must be at least 10 | |
6178 | */ | |
6179 | scale = 10; | |
6180 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6181 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6182 | scale++; |
6183 | } | |
6184 | res = (resync>>scale)*1000; | |
dd71cf6b | 6185 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6186 | |
6187 | per_milli = res; | |
1da177e4 | 6188 | { |
4588b42e | 6189 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6190 | seq_printf(seq, "["); |
6191 | for (i = 0; i < x; i++) | |
6192 | seq_printf(seq, "="); | |
6193 | seq_printf(seq, ">"); | |
6194 | for (i = 0; i < y; i++) | |
6195 | seq_printf(seq, "."); | |
6196 | seq_printf(seq, "] "); | |
6197 | } | |
4588b42e | 6198 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6199 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6200 | "reshape" : | |
61df9d91 N |
6201 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6202 | "check" : | |
6203 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6204 | "resync" : "recovery"))), | |
6205 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6206 | (unsigned long long) resync/2, |
6207 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6208 | |
6209 | /* | |
1da177e4 LT |
6210 | * dt: time from mark until now |
6211 | * db: blocks written from mark until now | |
6212 | * rt: remaining time | |
dd71cf6b N |
6213 | * |
6214 | * rt is a sector_t, so could be 32bit or 64bit. | |
6215 | * So we divide before multiply in case it is 32bit and close | |
6216 | * to the limit. | |
6217 | * We scale the divisor (db) by 32 to avoid loosing precision | |
6218 | * near the end of resync when the number of remaining sectors | |
6219 | * is close to 'db'. | |
6220 | * We then divide rt by 32 after multiplying by db to compensate. | |
6221 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6222 | */ |
6223 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6224 | if (!dt) dt++; | |
ff4e8d9a N |
6225 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6226 | - mddev->resync_mark_cnt; | |
1da177e4 | 6227 | |
dd71cf6b N |
6228 | rt = max_sectors - resync; /* number of remaining sectors */ |
6229 | sector_div(rt, db/32+1); | |
6230 | rt *= dt; | |
6231 | rt >>= 5; | |
6232 | ||
6233 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6234 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6235 | |
ff4e8d9a | 6236 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6237 | } |
6238 | ||
6239 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6240 | { | |
6241 | struct list_head *tmp; | |
6242 | loff_t l = *pos; | |
6243 | mddev_t *mddev; | |
6244 | ||
6245 | if (l >= 0x10000) | |
6246 | return NULL; | |
6247 | if (!l--) | |
6248 | /* header */ | |
6249 | return (void*)1; | |
6250 | ||
6251 | spin_lock(&all_mddevs_lock); | |
6252 | list_for_each(tmp,&all_mddevs) | |
6253 | if (!l--) { | |
6254 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6255 | mddev_get(mddev); | |
6256 | spin_unlock(&all_mddevs_lock); | |
6257 | return mddev; | |
6258 | } | |
6259 | spin_unlock(&all_mddevs_lock); | |
6260 | if (!l--) | |
6261 | return (void*)2;/* tail */ | |
6262 | return NULL; | |
6263 | } | |
6264 | ||
6265 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6266 | { | |
6267 | struct list_head *tmp; | |
6268 | mddev_t *next_mddev, *mddev = v; | |
6269 | ||
6270 | ++*pos; | |
6271 | if (v == (void*)2) | |
6272 | return NULL; | |
6273 | ||
6274 | spin_lock(&all_mddevs_lock); | |
6275 | if (v == (void*)1) | |
6276 | tmp = all_mddevs.next; | |
6277 | else | |
6278 | tmp = mddev->all_mddevs.next; | |
6279 | if (tmp != &all_mddevs) | |
6280 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6281 | else { | |
6282 | next_mddev = (void*)2; | |
6283 | *pos = 0x10000; | |
6284 | } | |
6285 | spin_unlock(&all_mddevs_lock); | |
6286 | ||
6287 | if (v != (void*)1) | |
6288 | mddev_put(mddev); | |
6289 | return next_mddev; | |
6290 | ||
6291 | } | |
6292 | ||
6293 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6294 | { | |
6295 | mddev_t *mddev = v; | |
6296 | ||
6297 | if (mddev && v != (void*)1 && v != (void*)2) | |
6298 | mddev_put(mddev); | |
6299 | } | |
6300 | ||
d7603b7e N |
6301 | struct mdstat_info { |
6302 | int event; | |
6303 | }; | |
6304 | ||
1da177e4 LT |
6305 | static int md_seq_show(struct seq_file *seq, void *v) |
6306 | { | |
6307 | mddev_t *mddev = v; | |
dd8ac336 | 6308 | sector_t sectors; |
1da177e4 | 6309 | mdk_rdev_t *rdev; |
d7603b7e | 6310 | struct mdstat_info *mi = seq->private; |
32a7627c | 6311 | struct bitmap *bitmap; |
1da177e4 LT |
6312 | |
6313 | if (v == (void*)1) { | |
2604b703 | 6314 | struct mdk_personality *pers; |
1da177e4 LT |
6315 | seq_printf(seq, "Personalities : "); |
6316 | spin_lock(&pers_lock); | |
2604b703 N |
6317 | list_for_each_entry(pers, &pers_list, list) |
6318 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6319 | |
6320 | spin_unlock(&pers_lock); | |
6321 | seq_printf(seq, "\n"); | |
d7603b7e | 6322 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6323 | return 0; |
6324 | } | |
6325 | if (v == (void*)2) { | |
6326 | status_unused(seq); | |
6327 | return 0; | |
6328 | } | |
6329 | ||
5dc5cf7d | 6330 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6331 | return -EINTR; |
5dc5cf7d | 6332 | |
1da177e4 LT |
6333 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6334 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6335 | mddev->pers ? "" : "in"); | |
6336 | if (mddev->pers) { | |
f91de92e | 6337 | if (mddev->ro==1) |
1da177e4 | 6338 | seq_printf(seq, " (read-only)"); |
f91de92e | 6339 | if (mddev->ro==2) |
52720ae7 | 6340 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6341 | seq_printf(seq, " %s", mddev->pers->name); |
6342 | } | |
6343 | ||
dd8ac336 | 6344 | sectors = 0; |
159ec1fc | 6345 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6346 | char b[BDEVNAME_SIZE]; |
6347 | seq_printf(seq, " %s[%d]", | |
6348 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6349 | if (test_bit(WriteMostly, &rdev->flags)) |
6350 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6351 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6352 | seq_printf(seq, "(F)"); |
6353 | continue; | |
b325a32e N |
6354 | } else if (rdev->raid_disk < 0) |
6355 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6356 | sectors += rdev->sectors; |
1da177e4 LT |
6357 | } |
6358 | ||
6359 | if (!list_empty(&mddev->disks)) { | |
6360 | if (mddev->pers) | |
6361 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6362 | (unsigned long long) |
6363 | mddev->array_sectors / 2); | |
1da177e4 LT |
6364 | else |
6365 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6366 | (unsigned long long)sectors / 2); |
1da177e4 | 6367 | } |
1cd6bf19 N |
6368 | if (mddev->persistent) { |
6369 | if (mddev->major_version != 0 || | |
6370 | mddev->minor_version != 90) { | |
6371 | seq_printf(seq," super %d.%d", | |
6372 | mddev->major_version, | |
6373 | mddev->minor_version); | |
6374 | } | |
e691063a N |
6375 | } else if (mddev->external) |
6376 | seq_printf(seq, " super external:%s", | |
6377 | mddev->metadata_type); | |
6378 | else | |
1cd6bf19 | 6379 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6380 | |
6381 | if (mddev->pers) { | |
d710e138 | 6382 | mddev->pers->status(seq, mddev); |
1da177e4 | 6383 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6384 | if (mddev->pers->sync_request) { |
6385 | if (mddev->curr_resync > 2) { | |
d710e138 | 6386 | status_resync(seq, mddev); |
8e1b39d6 N |
6387 | seq_printf(seq, "\n "); |
6388 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6389 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6390 | else if (mddev->recovery_cp < MaxSector) | |
6391 | seq_printf(seq, "\tresync=PENDING\n "); | |
6392 | } | |
32a7627c N |
6393 | } else |
6394 | seq_printf(seq, "\n "); | |
6395 | ||
6396 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6397 | unsigned long chunk_kb; |
6398 | unsigned long flags; | |
32a7627c | 6399 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6400 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6401 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6402 | "%lu%s chunk", | |
6403 | bitmap->pages - bitmap->missing_pages, | |
6404 | bitmap->pages, | |
6405 | (bitmap->pages - bitmap->missing_pages) | |
6406 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6407 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6408 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6409 | if (bitmap->file) { |
6410 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6411 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6412 | } |
78d742d8 | 6413 | |
32a7627c N |
6414 | seq_printf(seq, "\n"); |
6415 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6416 | } |
6417 | ||
6418 | seq_printf(seq, "\n"); | |
6419 | } | |
6420 | mddev_unlock(mddev); | |
6421 | ||
6422 | return 0; | |
6423 | } | |
6424 | ||
110518bc | 6425 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6426 | .start = md_seq_start, |
6427 | .next = md_seq_next, | |
6428 | .stop = md_seq_stop, | |
6429 | .show = md_seq_show, | |
6430 | }; | |
6431 | ||
6432 | static int md_seq_open(struct inode *inode, struct file *file) | |
6433 | { | |
6434 | int error; | |
d7603b7e N |
6435 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6436 | if (mi == NULL) | |
6437 | return -ENOMEM; | |
1da177e4 LT |
6438 | |
6439 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6440 | if (error) |
6441 | kfree(mi); | |
6442 | else { | |
6443 | struct seq_file *p = file->private_data; | |
6444 | p->private = mi; | |
6445 | mi->event = atomic_read(&md_event_count); | |
6446 | } | |
1da177e4 LT |
6447 | return error; |
6448 | } | |
6449 | ||
d7603b7e N |
6450 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6451 | { | |
6452 | struct seq_file *m = filp->private_data; | |
6453 | struct mdstat_info *mi = m->private; | |
6454 | int mask; | |
6455 | ||
6456 | poll_wait(filp, &md_event_waiters, wait); | |
6457 | ||
6458 | /* always allow read */ | |
6459 | mask = POLLIN | POLLRDNORM; | |
6460 | ||
6461 | if (mi->event != atomic_read(&md_event_count)) | |
6462 | mask |= POLLERR | POLLPRI; | |
6463 | return mask; | |
6464 | } | |
6465 | ||
fa027c2a | 6466 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6467 | .owner = THIS_MODULE, |
1da177e4 LT |
6468 | .open = md_seq_open, |
6469 | .read = seq_read, | |
6470 | .llseek = seq_lseek, | |
c3f94b40 | 6471 | .release = seq_release_private, |
d7603b7e | 6472 | .poll = mdstat_poll, |
1da177e4 LT |
6473 | }; |
6474 | ||
2604b703 | 6475 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6476 | { |
1da177e4 | 6477 | spin_lock(&pers_lock); |
2604b703 N |
6478 | list_add_tail(&p->list, &pers_list); |
6479 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6480 | spin_unlock(&pers_lock); |
6481 | return 0; | |
6482 | } | |
6483 | ||
2604b703 | 6484 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6485 | { |
2604b703 | 6486 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6487 | spin_lock(&pers_lock); |
2604b703 | 6488 | list_del_init(&p->list); |
1da177e4 LT |
6489 | spin_unlock(&pers_lock); |
6490 | return 0; | |
6491 | } | |
6492 | ||
eea1bf38 | 6493 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6494 | { |
6495 | mdk_rdev_t * rdev; | |
1da177e4 | 6496 | int idle; |
eea1bf38 | 6497 | int curr_events; |
1da177e4 LT |
6498 | |
6499 | idle = 1; | |
4b80991c N |
6500 | rcu_read_lock(); |
6501 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6502 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6503 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6504 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6505 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6506 | /* sync IO will cause sync_io to increase before the disk_stats |
6507 | * as sync_io is counted when a request starts, and | |
6508 | * disk_stats is counted when it completes. | |
6509 | * So resync activity will cause curr_events to be smaller than | |
6510 | * when there was no such activity. | |
6511 | * non-sync IO will cause disk_stat to increase without | |
6512 | * increasing sync_io so curr_events will (eventually) | |
6513 | * be larger than it was before. Once it becomes | |
6514 | * substantially larger, the test below will cause | |
6515 | * the array to appear non-idle, and resync will slow | |
6516 | * down. | |
6517 | * If there is a lot of outstanding resync activity when | |
6518 | * we set last_event to curr_events, then all that activity | |
6519 | * completing might cause the array to appear non-idle | |
6520 | * and resync will be slowed down even though there might | |
6521 | * not have been non-resync activity. This will only | |
6522 | * happen once though. 'last_events' will soon reflect | |
6523 | * the state where there is little or no outstanding | |
6524 | * resync requests, and further resync activity will | |
6525 | * always make curr_events less than last_events. | |
c0e48521 | 6526 | * |
1da177e4 | 6527 | */ |
eea1bf38 | 6528 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6529 | rdev->last_events = curr_events; |
6530 | idle = 0; | |
6531 | } | |
6532 | } | |
4b80991c | 6533 | rcu_read_unlock(); |
1da177e4 LT |
6534 | return idle; |
6535 | } | |
6536 | ||
6537 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6538 | { | |
6539 | /* another "blocks" (512byte) blocks have been synced */ | |
6540 | atomic_sub(blocks, &mddev->recovery_active); | |
6541 | wake_up(&mddev->recovery_wait); | |
6542 | if (!ok) { | |
dfc70645 | 6543 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6544 | md_wakeup_thread(mddev->thread); |
6545 | // stop recovery, signal do_sync .... | |
6546 | } | |
6547 | } | |
6548 | ||
6549 | ||
06d91a5f N |
6550 | /* md_write_start(mddev, bi) |
6551 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6552 | * in superblock) before writing, schedule a superblock update |
6553 | * and wait for it to complete. | |
06d91a5f | 6554 | */ |
3d310eb7 | 6555 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6556 | { |
0fd62b86 | 6557 | int did_change = 0; |
06d91a5f | 6558 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6559 | return; |
06d91a5f | 6560 | |
f91de92e N |
6561 | BUG_ON(mddev->ro == 1); |
6562 | if (mddev->ro == 2) { | |
6563 | /* need to switch to read/write */ | |
6564 | mddev->ro = 0; | |
6565 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6566 | md_wakeup_thread(mddev->thread); | |
25156198 | 6567 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6568 | did_change = 1; |
f91de92e | 6569 | } |
06d91a5f | 6570 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6571 | if (mddev->safemode == 1) |
6572 | mddev->safemode = 0; | |
06d91a5f | 6573 | if (mddev->in_sync) { |
a9701a30 | 6574 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6575 | if (mddev->in_sync) { |
6576 | mddev->in_sync = 0; | |
850b2b42 | 6577 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6578 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6579 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6580 | did_change = 1; |
3d310eb7 | 6581 | } |
a9701a30 | 6582 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6583 | } |
0fd62b86 | 6584 | if (did_change) |
00bcb4ac | 6585 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 6586 | wait_event(mddev->sb_wait, |
09a44cc1 | 6587 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
6588 | } |
6589 | ||
6590 | void md_write_end(mddev_t *mddev) | |
6591 | { | |
6592 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6593 | if (mddev->safemode == 2) | |
6594 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6595 | else if (mddev->safemode_delay) |
1da177e4 LT |
6596 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6597 | } | |
6598 | } | |
6599 | ||
2a2275d6 N |
6600 | /* md_allow_write(mddev) |
6601 | * Calling this ensures that the array is marked 'active' so that writes | |
6602 | * may proceed without blocking. It is important to call this before | |
6603 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6604 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6605 | * |
6606 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6607 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6608 | */ |
b5470dc5 | 6609 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6610 | { |
6611 | if (!mddev->pers) | |
b5470dc5 | 6612 | return 0; |
2a2275d6 | 6613 | if (mddev->ro) |
b5470dc5 | 6614 | return 0; |
1a0fd497 | 6615 | if (!mddev->pers->sync_request) |
b5470dc5 | 6616 | return 0; |
2a2275d6 N |
6617 | |
6618 | spin_lock_irq(&mddev->write_lock); | |
6619 | if (mddev->in_sync) { | |
6620 | mddev->in_sync = 0; | |
6621 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 6622 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
6623 | if (mddev->safemode_delay && |
6624 | mddev->safemode == 0) | |
6625 | mddev->safemode = 1; | |
6626 | spin_unlock_irq(&mddev->write_lock); | |
6627 | md_update_sb(mddev, 0); | |
00bcb4ac | 6628 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6629 | } else |
6630 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 6631 | |
070dc6dd | 6632 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
6633 | return -EAGAIN; |
6634 | else | |
6635 | return 0; | |
2a2275d6 N |
6636 | } |
6637 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6638 | ||
b63d7c2e | 6639 | void md_unplug(mddev_t *mddev) |
252ac522 N |
6640 | { |
6641 | if (mddev->queue) | |
6642 | blk_unplug(mddev->queue); | |
6643 | if (mddev->plug) | |
6644 | mddev->plug->unplug_fn(mddev->plug); | |
6645 | } | |
6646 | ||
1da177e4 LT |
6647 | #define SYNC_MARKS 10 |
6648 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6649 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6650 | { |
6651 | mddev_t *mddev2; | |
6652 | unsigned int currspeed = 0, | |
6653 | window; | |
57afd89f | 6654 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6655 | unsigned long mark[SYNC_MARKS]; |
6656 | sector_t mark_cnt[SYNC_MARKS]; | |
6657 | int last_mark,m; | |
6658 | struct list_head *tmp; | |
6659 | sector_t last_check; | |
57afd89f | 6660 | int skipped = 0; |
5fd6c1dc | 6661 | mdk_rdev_t *rdev; |
61df9d91 | 6662 | char *desc; |
1da177e4 LT |
6663 | |
6664 | /* just incase thread restarts... */ | |
6665 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6666 | return; | |
5fd6c1dc N |
6667 | if (mddev->ro) /* never try to sync a read-only array */ |
6668 | return; | |
1da177e4 | 6669 | |
61df9d91 N |
6670 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6671 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6672 | desc = "data-check"; | |
6673 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6674 | desc = "requested-resync"; | |
6675 | else | |
6676 | desc = "resync"; | |
6677 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6678 | desc = "reshape"; | |
6679 | else | |
6680 | desc = "recovery"; | |
6681 | ||
1da177e4 LT |
6682 | /* we overload curr_resync somewhat here. |
6683 | * 0 == not engaged in resync at all | |
6684 | * 2 == checking that there is no conflict with another sync | |
6685 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6686 | * commense | |
6687 | * other == active in resync - this many blocks | |
6688 | * | |
6689 | * Before starting a resync we must have set curr_resync to | |
6690 | * 2, and then checked that every "conflicting" array has curr_resync | |
6691 | * less than ours. When we find one that is the same or higher | |
6692 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6693 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6694 | * This will mean we have to start checking from the beginning again. | |
6695 | * | |
6696 | */ | |
6697 | ||
6698 | do { | |
6699 | mddev->curr_resync = 2; | |
6700 | ||
6701 | try_again: | |
404e4b43 | 6702 | if (kthread_should_stop()) |
6985c43f | 6703 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6704 | |
6705 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6706 | goto skip; |
29ac4aa3 | 6707 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6708 | if (mddev2 == mddev) |
6709 | continue; | |
90b08710 BS |
6710 | if (!mddev->parallel_resync |
6711 | && mddev2->curr_resync | |
6712 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6713 | DEFINE_WAIT(wq); |
6714 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6715 | /* arbitrarily yield */ | |
6716 | mddev->curr_resync = 1; | |
6717 | wake_up(&resync_wait); | |
6718 | } | |
6719 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6720 | /* no need to wait here, we can wait the next | |
6721 | * time 'round when curr_resync == 2 | |
6722 | */ | |
6723 | continue; | |
9744197c N |
6724 | /* We need to wait 'interruptible' so as not to |
6725 | * contribute to the load average, and not to | |
6726 | * be caught by 'softlockup' | |
6727 | */ | |
6728 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6729 | if (!kthread_should_stop() && |
8712e553 | 6730 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6731 | printk(KERN_INFO "md: delaying %s of %s" |
6732 | " until %s has finished (they" | |
1da177e4 | 6733 | " share one or more physical units)\n", |
61df9d91 | 6734 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6735 | mddev_put(mddev2); |
9744197c N |
6736 | if (signal_pending(current)) |
6737 | flush_signals(current); | |
1da177e4 LT |
6738 | schedule(); |
6739 | finish_wait(&resync_wait, &wq); | |
6740 | goto try_again; | |
6741 | } | |
6742 | finish_wait(&resync_wait, &wq); | |
6743 | } | |
6744 | } | |
6745 | } while (mddev->curr_resync < 2); | |
6746 | ||
5fd6c1dc | 6747 | j = 0; |
9d88883e | 6748 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6749 | /* resync follows the size requested by the personality, |
57afd89f | 6750 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6751 | */ |
6752 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6753 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6754 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6755 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6756 | j = mddev->resync_min; | |
6757 | else if (!mddev->bitmap) | |
5fd6c1dc | 6758 | j = mddev->recovery_cp; |
5e96ee65 | 6759 | |
ccfcc3c1 | 6760 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6761 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6762 | else { |
1da177e4 | 6763 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6764 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6765 | j = MaxSector; |
4e59ca7d DW |
6766 | rcu_read_lock(); |
6767 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
6768 | if (rdev->raid_disk >= 0 && |
6769 | !test_bit(Faulty, &rdev->flags) && | |
6770 | !test_bit(In_sync, &rdev->flags) && | |
6771 | rdev->recovery_offset < j) | |
6772 | j = rdev->recovery_offset; | |
4e59ca7d | 6773 | rcu_read_unlock(); |
5fd6c1dc | 6774 | } |
1da177e4 | 6775 | |
61df9d91 N |
6776 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6777 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6778 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6779 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6780 | "(but not more than %d KB/sec) for %s.\n", |
6781 | speed_max(mddev), desc); | |
1da177e4 | 6782 | |
eea1bf38 | 6783 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6784 | |
57afd89f | 6785 | io_sectors = 0; |
1da177e4 LT |
6786 | for (m = 0; m < SYNC_MARKS; m++) { |
6787 | mark[m] = jiffies; | |
57afd89f | 6788 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6789 | } |
6790 | last_mark = 0; | |
6791 | mddev->resync_mark = mark[last_mark]; | |
6792 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6793 | ||
6794 | /* | |
6795 | * Tune reconstruction: | |
6796 | */ | |
6797 | window = 32*(PAGE_SIZE/512); | |
6798 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6799 | window/2,(unsigned long long) max_sectors/2); | |
6800 | ||
6801 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6802 | last_check = 0; |
6803 | ||
6804 | if (j>2) { | |
6805 | printk(KERN_INFO | |
61df9d91 N |
6806 | "md: resuming %s of %s from checkpoint.\n", |
6807 | desc, mdname(mddev)); | |
1da177e4 LT |
6808 | mddev->curr_resync = j; |
6809 | } | |
efa59339 | 6810 | mddev->curr_resync_completed = mddev->curr_resync; |
1da177e4 LT |
6811 | |
6812 | while (j < max_sectors) { | |
57afd89f | 6813 | sector_t sectors; |
1da177e4 | 6814 | |
57afd89f | 6815 | skipped = 0; |
97e4f42d | 6816 | |
7a91ee1f N |
6817 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6818 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6819 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6820 | > (max_sectors >> 4)) || | |
6821 | (j - mddev->curr_resync_completed)*2 | |
6822 | >= mddev->resync_max - mddev->curr_resync_completed | |
6823 | )) { | |
97e4f42d | 6824 | /* time to update curr_resync_completed */ |
252ac522 | 6825 | md_unplug(mddev); |
97e4f42d N |
6826 | wait_event(mddev->recovery_wait, |
6827 | atomic_read(&mddev->recovery_active) == 0); | |
6828 | mddev->curr_resync_completed = | |
6829 | mddev->curr_resync; | |
070dc6dd | 6830 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 6831 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6832 | } |
acb180b0 | 6833 | |
e62e58a5 N |
6834 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6835 | /* As this condition is controlled by user-space, | |
6836 | * we can block indefinitely, so use '_interruptible' | |
6837 | * to avoid triggering warnings. | |
6838 | */ | |
6839 | flush_signals(current); /* just in case */ | |
6840 | wait_event_interruptible(mddev->recovery_wait, | |
6841 | mddev->resync_max > j | |
6842 | || kthread_should_stop()); | |
6843 | } | |
acb180b0 N |
6844 | |
6845 | if (kthread_should_stop()) | |
6846 | goto interrupted; | |
6847 | ||
57afd89f | 6848 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6849 | currspeed < speed_min(mddev)); |
57afd89f | 6850 | if (sectors == 0) { |
dfc70645 | 6851 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6852 | goto out; |
6853 | } | |
57afd89f N |
6854 | |
6855 | if (!skipped) { /* actual IO requested */ | |
6856 | io_sectors += sectors; | |
6857 | atomic_add(sectors, &mddev->recovery_active); | |
6858 | } | |
6859 | ||
1da177e4 LT |
6860 | j += sectors; |
6861 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6862 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6863 | if (last_check == 0) |
6864 | /* this is the earliers that rebuilt will be | |
6865 | * visible in /proc/mdstat | |
6866 | */ | |
6867 | md_new_event(mddev); | |
57afd89f N |
6868 | |
6869 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6870 | continue; |
6871 | ||
57afd89f | 6872 | last_check = io_sectors; |
1da177e4 | 6873 | |
dfc70645 | 6874 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6875 | break; |
6876 | ||
6877 | repeat: | |
6878 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6879 | /* step marks */ | |
6880 | int next = (last_mark+1) % SYNC_MARKS; | |
6881 | ||
6882 | mddev->resync_mark = mark[next]; | |
6883 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6884 | mark[next] = jiffies; | |
57afd89f | 6885 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6886 | last_mark = next; |
6887 | } | |
6888 | ||
6889 | ||
c6207277 N |
6890 | if (kthread_should_stop()) |
6891 | goto interrupted; | |
6892 | ||
1da177e4 LT |
6893 | |
6894 | /* | |
6895 | * this loop exits only if either when we are slower than | |
6896 | * the 'hard' speed limit, or the system was IO-idle for | |
6897 | * a jiffy. | |
6898 | * the system might be non-idle CPU-wise, but we only care | |
6899 | * about not overloading the IO subsystem. (things like an | |
6900 | * e2fsck being done on the RAID array should execute fast) | |
6901 | */ | |
252ac522 | 6902 | md_unplug(mddev); |
1da177e4 LT |
6903 | cond_resched(); |
6904 | ||
57afd89f N |
6905 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6906 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6907 | |
88202a0c N |
6908 | if (currspeed > speed_min(mddev)) { |
6909 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6910 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6911 | msleep(500); |
1da177e4 LT |
6912 | goto repeat; |
6913 | } | |
6914 | } | |
6915 | } | |
61df9d91 | 6916 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6917 | /* |
6918 | * this also signals 'finished resyncing' to md_stop | |
6919 | */ | |
6920 | out: | |
252ac522 | 6921 | md_unplug(mddev); |
1da177e4 LT |
6922 | |
6923 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6924 | ||
6925 | /* tell personality that we are finished */ | |
57afd89f | 6926 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6927 | |
dfc70645 | 6928 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6929 | mddev->curr_resync > 2) { |
6930 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6931 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6932 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6933 | printk(KERN_INFO | |
61df9d91 N |
6934 | "md: checkpointing %s of %s.\n", |
6935 | desc, mdname(mddev)); | |
5fd6c1dc N |
6936 | mddev->recovery_cp = mddev->curr_resync; |
6937 | } | |
6938 | } else | |
6939 | mddev->recovery_cp = MaxSector; | |
6940 | } else { | |
6941 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6942 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
6943 | rcu_read_lock(); |
6944 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 6945 | if (rdev->raid_disk >= 0 && |
70fffd0b | 6946 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
6947 | !test_bit(Faulty, &rdev->flags) && |
6948 | !test_bit(In_sync, &rdev->flags) && | |
6949 | rdev->recovery_offset < mddev->curr_resync) | |
6950 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 6951 | rcu_read_unlock(); |
5fd6c1dc | 6952 | } |
1da177e4 | 6953 | } |
17571284 | 6954 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6955 | |
1da177e4 | 6956 | skip: |
c07b70ad N |
6957 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
6958 | /* We completed so min/max setting can be forgotten if used. */ | |
6959 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6960 | mddev->resync_min = 0; | |
6961 | mddev->resync_max = MaxSector; | |
6962 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6963 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 6964 | mddev->curr_resync = 0; |
efa59339 N |
6965 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
6966 | mddev->curr_resync_completed = 0; | |
c6207277 | 6967 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
1da177e4 LT |
6968 | wake_up(&resync_wait); |
6969 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6970 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6971 | return; |
6972 | ||
6973 | interrupted: | |
6974 | /* | |
6975 | * got a signal, exit. | |
6976 | */ | |
6977 | printk(KERN_INFO | |
6978 | "md: md_do_sync() got signal ... exiting\n"); | |
6979 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6980 | goto out; | |
6981 | ||
1da177e4 | 6982 | } |
29269553 | 6983 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6984 | |
6985 | ||
b4c4c7b8 N |
6986 | static int remove_and_add_spares(mddev_t *mddev) |
6987 | { | |
6988 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6989 | int spares = 0; |
6990 | ||
97e4f42d N |
6991 | mddev->curr_resync_completed = 0; |
6992 | ||
159ec1fc | 6993 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6994 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6995 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6996 | (test_bit(Faulty, &rdev->flags) || |
6997 | ! test_bit(In_sync, &rdev->flags)) && | |
6998 | atomic_read(&rdev->nr_pending)==0) { | |
6999 | if (mddev->pers->hot_remove_disk( | |
7000 | mddev, rdev->raid_disk)==0) { | |
7001 | char nm[20]; | |
7002 | sprintf(nm,"rd%d", rdev->raid_disk); | |
7003 | sysfs_remove_link(&mddev->kobj, nm); | |
7004 | rdev->raid_disk = -1; | |
7005 | } | |
7006 | } | |
7007 | ||
4044ba58 | 7008 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 7009 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7010 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
7011 | !test_bit(In_sync, &rdev->flags) && |
7012 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 7013 | spares++; |
b4c4c7b8 N |
7014 | if (rdev->raid_disk < 0 |
7015 | && !test_bit(Faulty, &rdev->flags)) { | |
7016 | rdev->recovery_offset = 0; | |
199050ea NB |
7017 | if (mddev->pers-> |
7018 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
7019 | char nm[20]; |
7020 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
7021 | if (sysfs_create_link(&mddev->kobj, |
7022 | &rdev->kobj, nm)) | |
00bcb4ac | 7023 | /* failure here is OK */; |
b4c4c7b8 N |
7024 | spares++; |
7025 | md_new_event(mddev); | |
93be75ff | 7026 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
7027 | } else |
7028 | break; | |
7029 | } | |
dfc70645 | 7030 | } |
b4c4c7b8 N |
7031 | } |
7032 | return spares; | |
7033 | } | |
1da177e4 LT |
7034 | /* |
7035 | * This routine is regularly called by all per-raid-array threads to | |
7036 | * deal with generic issues like resync and super-block update. | |
7037 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7038 | * need this as they never do any recovery or update the superblock. | |
7039 | * | |
7040 | * It does not do any resync itself, but rather "forks" off other threads | |
7041 | * to do that as needed. | |
7042 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7043 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7044 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7045 | * and wakeups up this thread which will reap the thread and finish up. |
7046 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7047 | * | |
7048 | * The overall approach is: | |
7049 | * 1/ if the superblock needs updating, update it. | |
7050 | * 2/ If a recovery thread is running, don't do anything else. | |
7051 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7052 | * 4/ If there are any faulty devices, remove them. | |
7053 | * 5/ If array is degraded, try to add spares devices | |
7054 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7055 | */ | |
7056 | void md_check_recovery(mddev_t *mddev) | |
7057 | { | |
7058 | mdk_rdev_t *rdev; | |
1da177e4 LT |
7059 | |
7060 | ||
5f40402d | 7061 | if (mddev->bitmap) |
aa5cbd10 | 7062 | bitmap_daemon_work(mddev); |
1da177e4 LT |
7063 | |
7064 | if (mddev->ro) | |
7065 | return; | |
fca4d848 N |
7066 | |
7067 | if (signal_pending(current)) { | |
31a59e34 | 7068 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7069 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7070 | mdname(mddev)); | |
7071 | mddev->safemode = 2; | |
7072 | } | |
7073 | flush_signals(current); | |
7074 | } | |
7075 | ||
c89a8eee N |
7076 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7077 | return; | |
1da177e4 | 7078 | if ( ! ( |
126925c0 | 7079 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7080 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7081 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7082 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7083 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7084 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7085 | )) |
7086 | return; | |
fca4d848 | 7087 | |
df5b89b3 | 7088 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7089 | int spares = 0; |
fca4d848 | 7090 | |
c89a8eee N |
7091 | if (mddev->ro) { |
7092 | /* Only thing we do on a ro array is remove | |
7093 | * failed devices. | |
7094 | */ | |
7095 | remove_and_add_spares(mddev); | |
7096 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7097 | goto unlock; | |
7098 | } | |
7099 | ||
31a59e34 | 7100 | if (!mddev->external) { |
0fd62b86 | 7101 | int did_change = 0; |
31a59e34 N |
7102 | spin_lock_irq(&mddev->write_lock); |
7103 | if (mddev->safemode && | |
7104 | !atomic_read(&mddev->writes_pending) && | |
7105 | !mddev->in_sync && | |
7106 | mddev->recovery_cp == MaxSector) { | |
7107 | mddev->in_sync = 1; | |
0fd62b86 | 7108 | did_change = 1; |
070dc6dd | 7109 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7110 | } |
7111 | if (mddev->safemode == 1) | |
7112 | mddev->safemode = 0; | |
7113 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7114 | if (did_change) |
00bcb4ac | 7115 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7116 | } |
fca4d848 | 7117 | |
850b2b42 N |
7118 | if (mddev->flags) |
7119 | md_update_sb(mddev, 0); | |
06d91a5f | 7120 | |
1da177e4 LT |
7121 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7122 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7123 | /* resync/recovery still happening */ | |
7124 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7125 | goto unlock; | |
7126 | } | |
7127 | if (mddev->sync_thread) { | |
7128 | /* resync has finished, collect result */ | |
7129 | md_unregister_thread(mddev->sync_thread); | |
7130 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
7131 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
7132 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
7133 | /* success...*/ |
7134 | /* activate any spares */ | |
a99ac971 NB |
7135 | if (mddev->pers->spare_active(mddev)) |
7136 | sysfs_notify(&mddev->kobj, NULL, | |
7137 | "degraded"); | |
1da177e4 | 7138 | } |
cea9c228 N |
7139 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7140 | mddev->pers->finish_reshape) | |
7141 | mddev->pers->finish_reshape(mddev); | |
850b2b42 | 7142 | md_update_sb(mddev, 1); |
41158c7e N |
7143 | |
7144 | /* if array is no-longer degraded, then any saved_raid_disk | |
7145 | * information must be scrapped | |
7146 | */ | |
7147 | if (!mddev->degraded) | |
159ec1fc | 7148 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
7149 | rdev->saved_raid_disk = -1; |
7150 | ||
1da177e4 LT |
7151 | mddev->recovery = 0; |
7152 | /* flag recovery needed just to double check */ | |
7153 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
00bcb4ac | 7154 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7155 | md_new_event(mddev); |
1da177e4 LT |
7156 | goto unlock; |
7157 | } | |
72a23c21 NB |
7158 | /* Set RUNNING before clearing NEEDED to avoid |
7159 | * any transients in the value of "sync_action". | |
7160 | */ | |
7161 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7162 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7163 | /* Clear some bits that don't mean anything, but |
7164 | * might be left set | |
7165 | */ | |
24dd469d N |
7166 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7167 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7168 | |
5fd6c1dc N |
7169 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7170 | goto unlock; | |
1da177e4 LT |
7171 | /* no recovery is running. |
7172 | * remove any failed drives, then | |
7173 | * add spares if possible. | |
7174 | * Spare are also removed and re-added, to allow | |
7175 | * the personality to fail the re-add. | |
7176 | */ | |
1da177e4 | 7177 | |
b4c4c7b8 | 7178 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7179 | if (mddev->pers->check_reshape == NULL || |
7180 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7181 | /* Cannot proceed */ |
7182 | goto unlock; | |
7183 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7184 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7185 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7186 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7187 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7188 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7189 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7190 | } else if (mddev->recovery_cp < MaxSector) { |
7191 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7192 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7193 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7194 | /* nothing to be done ... */ | |
1da177e4 | 7195 | goto unlock; |
24dd469d | 7196 | |
1da177e4 | 7197 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7198 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7199 | /* We are adding a device or devices to an array | |
7200 | * which has the bitmap stored on all devices. | |
7201 | * So make sure all bitmap pages get written | |
7202 | */ | |
7203 | bitmap_write_all(mddev->bitmap); | |
7204 | } | |
1da177e4 LT |
7205 | mddev->sync_thread = md_register_thread(md_do_sync, |
7206 | mddev, | |
0da3c619 | 7207 | "resync"); |
1da177e4 LT |
7208 | if (!mddev->sync_thread) { |
7209 | printk(KERN_ERR "%s: could not start resync" | |
7210 | " thread...\n", | |
7211 | mdname(mddev)); | |
7212 | /* leave the spares where they are, it shouldn't hurt */ | |
7213 | mddev->recovery = 0; | |
d7603b7e | 7214 | } else |
1da177e4 | 7215 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7216 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7217 | md_new_event(mddev); |
1da177e4 LT |
7218 | } |
7219 | unlock: | |
72a23c21 NB |
7220 | if (!mddev->sync_thread) { |
7221 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7222 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7223 | &mddev->recovery)) | |
0c3573f1 | 7224 | if (mddev->sysfs_action) |
00bcb4ac | 7225 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7226 | } |
1da177e4 LT |
7227 | mddev_unlock(mddev); |
7228 | } | |
7229 | } | |
7230 | ||
6bfe0b49 DW |
7231 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7232 | { | |
00bcb4ac | 7233 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 DW |
7234 | wait_event_timeout(rdev->blocked_wait, |
7235 | !test_bit(Blocked, &rdev->flags), | |
7236 | msecs_to_jiffies(5000)); | |
7237 | rdev_dec_pending(rdev, mddev); | |
7238 | } | |
7239 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7240 | ||
75c96f85 AB |
7241 | static int md_notify_reboot(struct notifier_block *this, |
7242 | unsigned long code, void *x) | |
1da177e4 LT |
7243 | { |
7244 | struct list_head *tmp; | |
7245 | mddev_t *mddev; | |
7246 | ||
7247 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7248 | ||
7249 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7250 | ||
29ac4aa3 | 7251 | for_each_mddev(mddev, tmp) |
c71d4887 | 7252 | if (mddev_trylock(mddev)) { |
2b25000b N |
7253 | /* Force a switch to readonly even array |
7254 | * appears to still be in use. Hence | |
7255 | * the '100'. | |
7256 | */ | |
a4bd82d0 | 7257 | md_set_readonly(mddev, 100); |
c71d4887 NB |
7258 | mddev_unlock(mddev); |
7259 | } | |
1da177e4 LT |
7260 | /* |
7261 | * certain more exotic SCSI devices are known to be | |
7262 | * volatile wrt too early system reboots. While the | |
7263 | * right place to handle this issue is the given | |
7264 | * driver, we do want to have a safe RAID driver ... | |
7265 | */ | |
7266 | mdelay(1000*1); | |
7267 | } | |
7268 | return NOTIFY_DONE; | |
7269 | } | |
7270 | ||
75c96f85 | 7271 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7272 | .notifier_call = md_notify_reboot, |
7273 | .next = NULL, | |
7274 | .priority = INT_MAX, /* before any real devices */ | |
7275 | }; | |
7276 | ||
7277 | static void md_geninit(void) | |
7278 | { | |
1da177e4 LT |
7279 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7280 | ||
c7705f34 | 7281 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7282 | } |
7283 | ||
75c96f85 | 7284 | static int __init md_init(void) |
1da177e4 | 7285 | { |
e804ac78 TH |
7286 | int ret = -ENOMEM; |
7287 | ||
7288 | md_wq = alloc_workqueue("md", WQ_RESCUER, 0); | |
7289 | if (!md_wq) | |
7290 | goto err_wq; | |
7291 | ||
7292 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
7293 | if (!md_misc_wq) | |
7294 | goto err_misc_wq; | |
7295 | ||
7296 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
7297 | goto err_md; | |
7298 | ||
7299 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
7300 | goto err_mdp; | |
7301 | mdp_major = ret; | |
7302 | ||
3dbd8c2e | 7303 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7304 | md_probe, NULL, NULL); |
7305 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7306 | md_probe, NULL, NULL); |
7307 | ||
1da177e4 | 7308 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7309 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7310 | |
7311 | md_geninit(); | |
d710e138 | 7312 | return 0; |
1da177e4 | 7313 | |
e804ac78 TH |
7314 | err_mdp: |
7315 | unregister_blkdev(MD_MAJOR, "md"); | |
7316 | err_md: | |
7317 | destroy_workqueue(md_misc_wq); | |
7318 | err_misc_wq: | |
7319 | destroy_workqueue(md_wq); | |
7320 | err_wq: | |
7321 | return ret; | |
7322 | } | |
1da177e4 LT |
7323 | |
7324 | #ifndef MODULE | |
7325 | ||
7326 | /* | |
7327 | * Searches all registered partitions for autorun RAID arrays | |
7328 | * at boot time. | |
7329 | */ | |
4d936ec1 ME |
7330 | |
7331 | static LIST_HEAD(all_detected_devices); | |
7332 | struct detected_devices_node { | |
7333 | struct list_head list; | |
7334 | dev_t dev; | |
7335 | }; | |
1da177e4 LT |
7336 | |
7337 | void md_autodetect_dev(dev_t dev) | |
7338 | { | |
4d936ec1 ME |
7339 | struct detected_devices_node *node_detected_dev; |
7340 | ||
7341 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7342 | if (node_detected_dev) { | |
7343 | node_detected_dev->dev = dev; | |
7344 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7345 | } else { | |
7346 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7347 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7348 | } | |
1da177e4 LT |
7349 | } |
7350 | ||
7351 | ||
7352 | static void autostart_arrays(int part) | |
7353 | { | |
7354 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7355 | struct detected_devices_node *node_detected_dev; |
7356 | dev_t dev; | |
7357 | int i_scanned, i_passed; | |
1da177e4 | 7358 | |
4d936ec1 ME |
7359 | i_scanned = 0; |
7360 | i_passed = 0; | |
1da177e4 | 7361 | |
4d936ec1 | 7362 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7363 | |
4d936ec1 ME |
7364 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7365 | i_scanned++; | |
7366 | node_detected_dev = list_entry(all_detected_devices.next, | |
7367 | struct detected_devices_node, list); | |
7368 | list_del(&node_detected_dev->list); | |
7369 | dev = node_detected_dev->dev; | |
7370 | kfree(node_detected_dev); | |
df968c4e | 7371 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7372 | if (IS_ERR(rdev)) |
7373 | continue; | |
7374 | ||
b2d444d7 | 7375 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7376 | MD_BUG(); |
7377 | continue; | |
7378 | } | |
d0fae18f | 7379 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 7380 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 7381 | i_passed++; |
1da177e4 | 7382 | } |
4d936ec1 ME |
7383 | |
7384 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
7385 | i_scanned, i_passed); | |
1da177e4 LT |
7386 | |
7387 | autorun_devices(part); | |
7388 | } | |
7389 | ||
fdee8ae4 | 7390 | #endif /* !MODULE */ |
1da177e4 LT |
7391 | |
7392 | static __exit void md_exit(void) | |
7393 | { | |
7394 | mddev_t *mddev; | |
7395 | struct list_head *tmp; | |
8ab5e4c1 | 7396 | |
3dbd8c2e | 7397 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 7398 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 7399 | |
3dbd8c2e | 7400 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
7401 | unregister_blkdev(mdp_major, "mdp"); |
7402 | unregister_reboot_notifier(&md_notifier); | |
7403 | unregister_sysctl_table(raid_table_header); | |
7404 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 7405 | for_each_mddev(mddev, tmp) { |
1da177e4 | 7406 | export_array(mddev); |
d3374825 | 7407 | mddev->hold_active = 0; |
1da177e4 | 7408 | } |
e804ac78 TH |
7409 | destroy_workqueue(md_misc_wq); |
7410 | destroy_workqueue(md_wq); | |
1da177e4 LT |
7411 | } |
7412 | ||
685784aa | 7413 | subsys_initcall(md_init); |
1da177e4 LT |
7414 | module_exit(md_exit) |
7415 | ||
f91de92e N |
7416 | static int get_ro(char *buffer, struct kernel_param *kp) |
7417 | { | |
7418 | return sprintf(buffer, "%d", start_readonly); | |
7419 | } | |
7420 | static int set_ro(const char *val, struct kernel_param *kp) | |
7421 | { | |
7422 | char *e; | |
7423 | int num = simple_strtoul(val, &e, 10); | |
7424 | if (*val && (*e == '\0' || *e == '\n')) { | |
7425 | start_readonly = num; | |
4dbcdc75 | 7426 | return 0; |
f91de92e N |
7427 | } |
7428 | return -EINVAL; | |
7429 | } | |
7430 | ||
80ca3a44 N |
7431 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
7432 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 7433 | |
efeb53c0 | 7434 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 7435 | |
1da177e4 LT |
7436 | EXPORT_SYMBOL(register_md_personality); |
7437 | EXPORT_SYMBOL(unregister_md_personality); | |
7438 | EXPORT_SYMBOL(md_error); | |
7439 | EXPORT_SYMBOL(md_done_sync); | |
7440 | EXPORT_SYMBOL(md_write_start); | |
7441 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
7442 | EXPORT_SYMBOL(md_register_thread); |
7443 | EXPORT_SYMBOL(md_unregister_thread); | |
7444 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
7445 | EXPORT_SYMBOL(md_check_recovery); |
7446 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7447 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 7448 | MODULE_ALIAS("md"); |
72008652 | 7449 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |