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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
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 | 289 | int cpu; |
e91ece55 | 290 | unsigned int sectors; |
49077326 | 291 | |
0ca69886 N |
292 | if (mddev == NULL || mddev->pers == NULL |
293 | || !mddev->ready) { | |
409c57f3 N |
294 | bio_io_error(bio); |
295 | return 0; | |
296 | } | |
0ca69886 | 297 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 298 | rcu_read_lock(); |
e9c7469b | 299 | if (mddev->suspended) { |
409c57f3 N |
300 | DEFINE_WAIT(__wait); |
301 | for (;;) { | |
302 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
303 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 304 | if (!mddev->suspended) |
409c57f3 N |
305 | break; |
306 | rcu_read_unlock(); | |
307 | schedule(); | |
308 | rcu_read_lock(); | |
309 | } | |
310 | finish_wait(&mddev->sb_wait, &__wait); | |
311 | } | |
312 | atomic_inc(&mddev->active_io); | |
313 | rcu_read_unlock(); | |
49077326 | 314 | |
e91ece55 CM |
315 | /* |
316 | * save the sectors now since our bio can | |
317 | * go away inside make_request | |
318 | */ | |
319 | sectors = bio_sectors(bio); | |
21a52c6d | 320 | rv = mddev->pers->make_request(mddev, bio); |
49077326 N |
321 | |
322 | cpu = part_stat_lock(); | |
323 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
e91ece55 | 324 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); |
49077326 N |
325 | part_stat_unlock(); |
326 | ||
409c57f3 N |
327 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
328 | wake_up(&mddev->sb_wait); | |
329 | ||
330 | return rv; | |
331 | } | |
332 | ||
9e35b99c N |
333 | /* mddev_suspend makes sure no new requests are submitted |
334 | * to the device, and that any requests that have been submitted | |
335 | * are completely handled. | |
336 | * Once ->stop is called and completes, the module will be completely | |
337 | * unused. | |
338 | */ | |
390ee602 | 339 | void mddev_suspend(mddev_t *mddev) |
409c57f3 N |
340 | { |
341 | BUG_ON(mddev->suspended); | |
342 | mddev->suspended = 1; | |
343 | synchronize_rcu(); | |
344 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
345 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 346 | } |
390ee602 | 347 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 348 | |
390ee602 | 349 | void mddev_resume(mddev_t *mddev) |
409c57f3 N |
350 | { |
351 | mddev->suspended = 0; | |
352 | wake_up(&mddev->sb_wait); | |
353 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 | 354 | } |
390ee602 | 355 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 356 | |
3fa841d7 N |
357 | int mddev_congested(mddev_t *mddev, int bits) |
358 | { | |
359 | return mddev->suspended; | |
360 | } | |
361 | EXPORT_SYMBOL(mddev_congested); | |
362 | ||
a2826aa9 | 363 | /* |
e9c7469b | 364 | * Generic flush handling for md |
a2826aa9 N |
365 | */ |
366 | ||
e9c7469b | 367 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 N |
368 | { |
369 | mdk_rdev_t *rdev = bio->bi_private; | |
370 | mddev_t *mddev = rdev->mddev; | |
a2826aa9 N |
371 | |
372 | rdev_dec_pending(rdev, mddev); | |
373 | ||
374 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 375 | /* The pre-request flush has finished */ |
e804ac78 | 376 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
377 | } |
378 | bio_put(bio); | |
379 | } | |
380 | ||
a7a07e69 N |
381 | static void md_submit_flush_data(struct work_struct *ws); |
382 | ||
a035fc3e | 383 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 384 | { |
a035fc3e | 385 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
a2826aa9 N |
386 | mdk_rdev_t *rdev; |
387 | ||
a7a07e69 N |
388 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
389 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 N |
390 | rcu_read_lock(); |
391 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
392 | if (rdev->raid_disk >= 0 && | |
393 | !test_bit(Faulty, &rdev->flags)) { | |
394 | /* Take two references, one is dropped | |
395 | * when request finishes, one after | |
396 | * we reclaim rcu_read_lock | |
397 | */ | |
398 | struct bio *bi; | |
399 | atomic_inc(&rdev->nr_pending); | |
400 | atomic_inc(&rdev->nr_pending); | |
401 | rcu_read_unlock(); | |
a167f663 | 402 | bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); |
e9c7469b | 403 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
404 | bi->bi_private = rdev; |
405 | bi->bi_bdev = rdev->bdev; | |
406 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 407 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
408 | rcu_read_lock(); |
409 | rdev_dec_pending(rdev, mddev); | |
410 | } | |
411 | rcu_read_unlock(); | |
a7a07e69 N |
412 | if (atomic_dec_and_test(&mddev->flush_pending)) |
413 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
414 | } |
415 | ||
e9c7469b | 416 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 417 | { |
e9c7469b TH |
418 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
419 | struct bio *bio = mddev->flush_bio; | |
a2826aa9 | 420 | |
e9c7469b | 421 | if (bio->bi_size == 0) |
a2826aa9 N |
422 | /* an empty barrier - all done */ |
423 | bio_endio(bio, 0); | |
424 | else { | |
e9c7469b | 425 | bio->bi_rw &= ~REQ_FLUSH; |
21a52c6d | 426 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 | 427 | generic_make_request(bio); |
a2826aa9 | 428 | } |
2b74e12e N |
429 | |
430 | mddev->flush_bio = NULL; | |
431 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
432 | } |
433 | ||
e9c7469b | 434 | void md_flush_request(mddev_t *mddev, struct bio *bio) |
a2826aa9 N |
435 | { |
436 | spin_lock_irq(&mddev->write_lock); | |
437 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 438 | !mddev->flush_bio, |
a2826aa9 | 439 | mddev->write_lock, /*nothing*/); |
e9c7469b | 440 | mddev->flush_bio = bio; |
a2826aa9 N |
441 | spin_unlock_irq(&mddev->write_lock); |
442 | ||
a035fc3e N |
443 | INIT_WORK(&mddev->flush_work, submit_flushes); |
444 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 445 | } |
e9c7469b | 446 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 447 | |
2ac87401 N |
448 | /* Support for plugging. |
449 | * This mirrors the plugging support in request_queue, but does not | |
450 | * require having a whole queue | |
451 | */ | |
452 | static void plugger_work(struct work_struct *work) | |
453 | { | |
454 | struct plug_handle *plug = | |
455 | container_of(work, struct plug_handle, unplug_work); | |
456 | plug->unplug_fn(plug); | |
457 | } | |
458 | static void plugger_timeout(unsigned long data) | |
459 | { | |
460 | struct plug_handle *plug = (void *)data; | |
461 | kblockd_schedule_work(NULL, &plug->unplug_work); | |
462 | } | |
463 | void plugger_init(struct plug_handle *plug, | |
464 | void (*unplug_fn)(struct plug_handle *)) | |
465 | { | |
466 | plug->unplug_flag = 0; | |
467 | plug->unplug_fn = unplug_fn; | |
468 | init_timer(&plug->unplug_timer); | |
469 | plug->unplug_timer.function = plugger_timeout; | |
470 | plug->unplug_timer.data = (unsigned long)plug; | |
471 | INIT_WORK(&plug->unplug_work, plugger_work); | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(plugger_init); | |
474 | ||
475 | void plugger_set_plug(struct plug_handle *plug) | |
476 | { | |
477 | if (!test_and_set_bit(PLUGGED_FLAG, &plug->unplug_flag)) | |
478 | mod_timer(&plug->unplug_timer, jiffies + msecs_to_jiffies(3)+1); | |
479 | } | |
480 | EXPORT_SYMBOL_GPL(plugger_set_plug); | |
481 | ||
482 | int plugger_remove_plug(struct plug_handle *plug) | |
483 | { | |
484 | if (test_and_clear_bit(PLUGGED_FLAG, &plug->unplug_flag)) { | |
485 | del_timer(&plug->unplug_timer); | |
486 | return 1; | |
487 | } else | |
488 | return 0; | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(plugger_remove_plug); | |
491 | ||
492 | ||
1da177e4 LT |
493 | static inline mddev_t *mddev_get(mddev_t *mddev) |
494 | { | |
495 | atomic_inc(&mddev->active); | |
496 | return mddev; | |
497 | } | |
498 | ||
5fd3a17e | 499 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 500 | |
1da177e4 LT |
501 | static void mddev_put(mddev_t *mddev) |
502 | { | |
a167f663 N |
503 | struct bio_set *bs = NULL; |
504 | ||
1da177e4 LT |
505 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
506 | return; | |
d3374825 | 507 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
508 | mddev->ctime == 0 && !mddev->hold_active) { |
509 | /* Array is not configured at all, and not held active, | |
510 | * so destroy it */ | |
1da177e4 | 511 | list_del(&mddev->all_mddevs); |
a167f663 N |
512 | bs = mddev->bio_set; |
513 | mddev->bio_set = NULL; | |
d3374825 | 514 | if (mddev->gendisk) { |
e804ac78 TH |
515 | /* We did a probe so need to clean up. Call |
516 | * queue_work inside the spinlock so that | |
517 | * flush_workqueue() after mddev_find will | |
518 | * succeed in waiting for the work to be done. | |
d3374825 N |
519 | */ |
520 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 521 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
522 | } else |
523 | kfree(mddev); | |
524 | } | |
525 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
526 | if (bs) |
527 | bioset_free(bs); | |
1da177e4 LT |
528 | } |
529 | ||
390ee602 | 530 | void mddev_init(mddev_t *mddev) |
fafd7fb0 N |
531 | { |
532 | mutex_init(&mddev->open_mutex); | |
533 | mutex_init(&mddev->reconfig_mutex); | |
534 | mutex_init(&mddev->bitmap_info.mutex); | |
535 | INIT_LIST_HEAD(&mddev->disks); | |
536 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
537 | init_timer(&mddev->safemode_timer); | |
538 | atomic_set(&mddev->active, 1); | |
539 | atomic_set(&mddev->openers, 0); | |
540 | atomic_set(&mddev->active_io, 0); | |
541 | spin_lock_init(&mddev->write_lock); | |
542 | atomic_set(&mddev->flush_pending, 0); | |
543 | init_waitqueue_head(&mddev->sb_wait); | |
544 | init_waitqueue_head(&mddev->recovery_wait); | |
545 | mddev->reshape_position = MaxSector; | |
546 | mddev->resync_min = 0; | |
547 | mddev->resync_max = MaxSector; | |
548 | mddev->level = LEVEL_NONE; | |
549 | } | |
390ee602 | 550 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 551 | |
1da177e4 LT |
552 | static mddev_t * mddev_find(dev_t unit) |
553 | { | |
554 | mddev_t *mddev, *new = NULL; | |
555 | ||
8f5f02c4 N |
556 | if (unit && MAJOR(unit) != MD_MAJOR) |
557 | unit &= ~((1<<MdpMinorShift)-1); | |
558 | ||
1da177e4 LT |
559 | retry: |
560 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
561 | |
562 | if (unit) { | |
563 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
564 | if (mddev->unit == unit) { | |
565 | mddev_get(mddev); | |
566 | spin_unlock(&all_mddevs_lock); | |
567 | kfree(new); | |
568 | return mddev; | |
569 | } | |
570 | ||
571 | if (new) { | |
572 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 573 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
574 | new->hold_active = UNTIL_IOCTL; |
575 | return new; | |
1da177e4 | 576 | } |
efeb53c0 N |
577 | } else if (new) { |
578 | /* find an unused unit number */ | |
579 | static int next_minor = 512; | |
580 | int start = next_minor; | |
581 | int is_free = 0; | |
582 | int dev = 0; | |
583 | while (!is_free) { | |
584 | dev = MKDEV(MD_MAJOR, next_minor); | |
585 | next_minor++; | |
586 | if (next_minor > MINORMASK) | |
587 | next_minor = 0; | |
588 | if (next_minor == start) { | |
589 | /* Oh dear, all in use. */ | |
590 | spin_unlock(&all_mddevs_lock); | |
591 | kfree(new); | |
592 | return NULL; | |
593 | } | |
594 | ||
595 | is_free = 1; | |
596 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
597 | if (mddev->unit == dev) { | |
598 | is_free = 0; | |
599 | break; | |
600 | } | |
601 | } | |
602 | new->unit = dev; | |
603 | new->md_minor = MINOR(dev); | |
604 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
605 | list_add(&new->all_mddevs, &all_mddevs); |
606 | spin_unlock(&all_mddevs_lock); | |
607 | return new; | |
608 | } | |
609 | spin_unlock(&all_mddevs_lock); | |
610 | ||
9ffae0cf | 611 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
612 | if (!new) |
613 | return NULL; | |
614 | ||
1da177e4 LT |
615 | new->unit = unit; |
616 | if (MAJOR(unit) == MD_MAJOR) | |
617 | new->md_minor = MINOR(unit); | |
618 | else | |
619 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
620 | ||
fafd7fb0 | 621 | mddev_init(new); |
1da177e4 | 622 | |
1da177e4 LT |
623 | goto retry; |
624 | } | |
625 | ||
626 | static inline int mddev_lock(mddev_t * mddev) | |
627 | { | |
df5b89b3 | 628 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
629 | } |
630 | ||
b522adcd DW |
631 | static inline int mddev_is_locked(mddev_t *mddev) |
632 | { | |
633 | return mutex_is_locked(&mddev->reconfig_mutex); | |
634 | } | |
635 | ||
1da177e4 LT |
636 | static inline int mddev_trylock(mddev_t * mddev) |
637 | { | |
df5b89b3 | 638 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
639 | } |
640 | ||
b6eb127d N |
641 | static struct attribute_group md_redundancy_group; |
642 | ||
a64c876f | 643 | static void mddev_unlock(mddev_t * mddev) |
1da177e4 | 644 | { |
a64c876f | 645 | if (mddev->to_remove) { |
b6eb127d N |
646 | /* These cannot be removed under reconfig_mutex as |
647 | * an access to the files will try to take reconfig_mutex | |
648 | * while holding the file unremovable, which leads to | |
649 | * a deadlock. | |
bb4f1e9d N |
650 | * So hold set sysfs_active while the remove in happeing, |
651 | * and anything else which might set ->to_remove or my | |
652 | * otherwise change the sysfs namespace will fail with | |
653 | * -EBUSY if sysfs_active is still set. | |
654 | * We set sysfs_active under reconfig_mutex and elsewhere | |
655 | * test it under the same mutex to ensure its correct value | |
656 | * is seen. | |
b6eb127d | 657 | */ |
a64c876f N |
658 | struct attribute_group *to_remove = mddev->to_remove; |
659 | mddev->to_remove = NULL; | |
bb4f1e9d | 660 | mddev->sysfs_active = 1; |
b6eb127d N |
661 | mutex_unlock(&mddev->reconfig_mutex); |
662 | ||
00bcb4ac N |
663 | if (mddev->kobj.sd) { |
664 | if (to_remove != &md_redundancy_group) | |
665 | sysfs_remove_group(&mddev->kobj, to_remove); | |
666 | if (mddev->pers == NULL || | |
667 | mddev->pers->sync_request == NULL) { | |
668 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
669 | if (mddev->sysfs_action) | |
670 | sysfs_put(mddev->sysfs_action); | |
671 | mddev->sysfs_action = NULL; | |
672 | } | |
a64c876f | 673 | } |
bb4f1e9d | 674 | mddev->sysfs_active = 0; |
b6eb127d N |
675 | } else |
676 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 677 | |
005eca5e | 678 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
679 | } |
680 | ||
2989ddbd | 681 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 682 | { |
159ec1fc | 683 | mdk_rdev_t *rdev; |
1da177e4 | 684 | |
159ec1fc | 685 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
686 | if (rdev->desc_nr == nr) |
687 | return rdev; | |
159ec1fc | 688 | |
1da177e4 LT |
689 | return NULL; |
690 | } | |
691 | ||
692 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
693 | { | |
1da177e4 LT |
694 | mdk_rdev_t *rdev; |
695 | ||
159ec1fc | 696 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
697 | if (rdev->bdev->bd_dev == dev) |
698 | return rdev; | |
159ec1fc | 699 | |
1da177e4 LT |
700 | return NULL; |
701 | } | |
702 | ||
d9d166c2 | 703 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
704 | { |
705 | struct mdk_personality *pers; | |
d9d166c2 N |
706 | list_for_each_entry(pers, &pers_list, list) { |
707 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 708 | return pers; |
d9d166c2 N |
709 | if (strcmp(pers->name, clevel)==0) |
710 | return pers; | |
711 | } | |
2604b703 N |
712 | return NULL; |
713 | } | |
714 | ||
b73df2d3 | 715 | /* return the offset of the super block in 512byte sectors */ |
57b2caa3 | 716 | static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev) |
1da177e4 | 717 | { |
57b2caa3 | 718 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 719 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
720 | } |
721 | ||
1da177e4 LT |
722 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
723 | { | |
724 | if (rdev->sb_page) | |
725 | MD_BUG(); | |
726 | ||
727 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
728 | if (!rdev->sb_page) { | |
729 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 730 | return -ENOMEM; |
1da177e4 LT |
731 | } |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
736 | static void free_disk_sb(mdk_rdev_t * rdev) | |
737 | { | |
738 | if (rdev->sb_page) { | |
2d1f3b5d | 739 | put_page(rdev->sb_page); |
1da177e4 LT |
740 | rdev->sb_loaded = 0; |
741 | rdev->sb_page = NULL; | |
0f420358 | 742 | rdev->sb_start = 0; |
dd8ac336 | 743 | rdev->sectors = 0; |
1da177e4 LT |
744 | } |
745 | } | |
746 | ||
747 | ||
6712ecf8 | 748 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
749 | { |
750 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 751 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 752 | |
3a0f5bbb N |
753 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
754 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
755 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
756 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 757 | md_error(mddev, rdev); |
3a0f5bbb | 758 | } |
7bfa19f2 | 759 | |
a9701a30 N |
760 | if (atomic_dec_and_test(&mddev->pending_writes)) |
761 | wake_up(&mddev->sb_wait); | |
f8b58edf | 762 | bio_put(bio); |
7bfa19f2 N |
763 | } |
764 | ||
765 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
766 | sector_t sector, int size, struct page *page) | |
767 | { | |
768 | /* write first size bytes of page to sector of rdev | |
769 | * Increment mddev->pending_writes before returning | |
770 | * and decrement it on completion, waking up sb_wait | |
771 | * if zero is reached. | |
772 | * If an error occurred, call md_error | |
773 | */ | |
a167f663 | 774 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 775 | |
a6ff7e08 | 776 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
7bfa19f2 N |
777 | bio->bi_sector = sector; |
778 | bio_add_page(bio, page, size, 0); | |
779 | bio->bi_private = rdev; | |
780 | bio->bi_end_io = super_written; | |
a9701a30 | 781 | |
7bfa19f2 | 782 | atomic_inc(&mddev->pending_writes); |
721a9602 | 783 | submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio); |
a9701a30 N |
784 | } |
785 | ||
786 | void md_super_wait(mddev_t *mddev) | |
787 | { | |
e9c7469b | 788 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
789 | DEFINE_WAIT(wq); |
790 | for(;;) { | |
791 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
792 | if (atomic_read(&mddev->pending_writes)==0) | |
793 | break; | |
a9701a30 N |
794 | schedule(); |
795 | } | |
796 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
797 | } |
798 | ||
6712ecf8 | 799 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 800 | { |
1da177e4 | 801 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
802 | } |
803 | ||
2b193363 | 804 | int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size, |
ccebd4c4 | 805 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 806 | { |
a167f663 | 807 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
808 | struct completion event; |
809 | int ret; | |
810 | ||
721a9602 | 811 | rw |= REQ_SYNC; |
1da177e4 | 812 | |
a6ff7e08 JB |
813 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
814 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 JB |
815 | if (metadata_op) |
816 | bio->bi_sector = sector + rdev->sb_start; | |
817 | else | |
818 | bio->bi_sector = sector + rdev->data_offset; | |
1da177e4 LT |
819 | bio_add_page(bio, page, size, 0); |
820 | init_completion(&event); | |
821 | bio->bi_private = &event; | |
822 | bio->bi_end_io = bi_complete; | |
823 | submit_bio(rw, bio); | |
824 | wait_for_completion(&event); | |
825 | ||
826 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
827 | bio_put(bio); | |
828 | return ret; | |
829 | } | |
a8745db2 | 830 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 831 | |
0002b271 | 832 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
833 | { |
834 | char b[BDEVNAME_SIZE]; | |
835 | if (!rdev->sb_page) { | |
836 | MD_BUG(); | |
837 | return -EINVAL; | |
838 | } | |
839 | if (rdev->sb_loaded) | |
840 | return 0; | |
841 | ||
842 | ||
ccebd4c4 | 843 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
844 | goto fail; |
845 | rdev->sb_loaded = 1; | |
846 | return 0; | |
847 | ||
848 | fail: | |
849 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
850 | bdevname(rdev->bdev,b)); | |
851 | return -EINVAL; | |
852 | } | |
853 | ||
854 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
855 | { | |
05710466 AN |
856 | return sb1->set_uuid0 == sb2->set_uuid0 && |
857 | sb1->set_uuid1 == sb2->set_uuid1 && | |
858 | sb1->set_uuid2 == sb2->set_uuid2 && | |
859 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
860 | } |
861 | ||
1da177e4 LT |
862 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
863 | { | |
864 | int ret; | |
865 | mdp_super_t *tmp1, *tmp2; | |
866 | ||
867 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
868 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
869 | ||
870 | if (!tmp1 || !tmp2) { | |
871 | ret = 0; | |
35020f1a | 872 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
873 | goto abort; |
874 | } | |
875 | ||
876 | *tmp1 = *sb1; | |
877 | *tmp2 = *sb2; | |
878 | ||
879 | /* | |
880 | * nr_disks is not constant | |
881 | */ | |
882 | tmp1->nr_disks = 0; | |
883 | tmp2->nr_disks = 0; | |
884 | ||
ce0c8e05 | 885 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 886 | abort: |
990a8baf JJ |
887 | kfree(tmp1); |
888 | kfree(tmp2); | |
1da177e4 LT |
889 | return ret; |
890 | } | |
891 | ||
4d167f09 N |
892 | |
893 | static u32 md_csum_fold(u32 csum) | |
894 | { | |
895 | csum = (csum & 0xffff) + (csum >> 16); | |
896 | return (csum & 0xffff) + (csum >> 16); | |
897 | } | |
898 | ||
1da177e4 LT |
899 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
900 | { | |
4d167f09 N |
901 | u64 newcsum = 0; |
902 | u32 *sb32 = (u32*)sb; | |
903 | int i; | |
1da177e4 LT |
904 | unsigned int disk_csum, csum; |
905 | ||
906 | disk_csum = sb->sb_csum; | |
907 | sb->sb_csum = 0; | |
4d167f09 N |
908 | |
909 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
910 | newcsum += sb32[i]; | |
911 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
912 | ||
913 | ||
914 | #ifdef CONFIG_ALPHA | |
915 | /* This used to use csum_partial, which was wrong for several | |
916 | * reasons including that different results are returned on | |
917 | * different architectures. It isn't critical that we get exactly | |
918 | * the same return value as before (we always csum_fold before | |
919 | * testing, and that removes any differences). However as we | |
920 | * know that csum_partial always returned a 16bit value on | |
921 | * alphas, do a fold to maximise conformity to previous behaviour. | |
922 | */ | |
923 | sb->sb_csum = md_csum_fold(disk_csum); | |
924 | #else | |
1da177e4 | 925 | sb->sb_csum = disk_csum; |
4d167f09 | 926 | #endif |
1da177e4 LT |
927 | return csum; |
928 | } | |
929 | ||
930 | ||
931 | /* | |
932 | * Handle superblock details. | |
933 | * We want to be able to handle multiple superblock formats | |
934 | * so we have a common interface to them all, and an array of | |
935 | * different handlers. | |
936 | * We rely on user-space to write the initial superblock, and support | |
937 | * reading and updating of superblocks. | |
938 | * Interface methods are: | |
939 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
940 | * loads and validates a superblock on dev. | |
941 | * if refdev != NULL, compare superblocks on both devices | |
942 | * Return: | |
943 | * 0 - dev has a superblock that is compatible with refdev | |
944 | * 1 - dev has a superblock that is compatible and newer than refdev | |
945 | * so dev should be used as the refdev in future | |
946 | * -EINVAL superblock incompatible or invalid | |
947 | * -othererror e.g. -EIO | |
948 | * | |
949 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
950 | * Verify that dev is acceptable into mddev. | |
951 | * The first time, mddev->raid_disks will be 0, and data from | |
952 | * dev should be merged in. Subsequent calls check that dev | |
953 | * is new enough. Return 0 or -EINVAL | |
954 | * | |
955 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
956 | * Update the superblock for rdev with data in mddev | |
957 | * This does not write to disc. | |
958 | * | |
959 | */ | |
960 | ||
961 | struct super_type { | |
0cd17fec CW |
962 | char *name; |
963 | struct module *owner; | |
964 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
965 | int minor_version); | |
966 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
967 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
968 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 969 | sector_t num_sectors); |
1da177e4 LT |
970 | }; |
971 | ||
0894cc30 AN |
972 | /* |
973 | * Check that the given mddev has no bitmap. | |
974 | * | |
975 | * This function is called from the run method of all personalities that do not | |
976 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
977 | * has a bitmap. Otherwise, it returns 0. | |
978 | * | |
979 | */ | |
980 | int md_check_no_bitmap(mddev_t *mddev) | |
981 | { | |
c3d9714e | 982 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
983 | return 0; |
984 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
985 | mdname(mddev), mddev->pers->name); | |
986 | return 1; | |
987 | } | |
988 | EXPORT_SYMBOL(md_check_no_bitmap); | |
989 | ||
1da177e4 LT |
990 | /* |
991 | * load_super for 0.90.0 | |
992 | */ | |
993 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
994 | { | |
995 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
996 | mdp_super_t *sb; | |
997 | int ret; | |
1da177e4 LT |
998 | |
999 | /* | |
0f420358 | 1000 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1001 | * it's at the end of the disk. |
1002 | * | |
1003 | * It also happens to be a multiple of 4Kb. | |
1004 | */ | |
57b2caa3 | 1005 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1006 | |
0002b271 | 1007 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
1008 | if (ret) return ret; |
1009 | ||
1010 | ret = -EINVAL; | |
1011 | ||
1012 | bdevname(rdev->bdev, b); | |
1013 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
1014 | ||
1015 | if (sb->md_magic != MD_SB_MAGIC) { | |
1016 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1017 | b); | |
1018 | goto abort; | |
1019 | } | |
1020 | ||
1021 | if (sb->major_version != 0 || | |
f6705578 N |
1022 | sb->minor_version < 90 || |
1023 | sb->minor_version > 91) { | |
1da177e4 LT |
1024 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1025 | sb->major_version, sb->minor_version, | |
1026 | b); | |
1027 | goto abort; | |
1028 | } | |
1029 | ||
1030 | if (sb->raid_disks <= 0) | |
1031 | goto abort; | |
1032 | ||
4d167f09 | 1033 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1034 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1035 | b); | |
1036 | goto abort; | |
1037 | } | |
1038 | ||
1039 | rdev->preferred_minor = sb->md_minor; | |
1040 | rdev->data_offset = 0; | |
0002b271 | 1041 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
1042 | |
1043 | if (sb->level == LEVEL_MULTIPATH) | |
1044 | rdev->desc_nr = -1; | |
1045 | else | |
1046 | rdev->desc_nr = sb->this_disk.number; | |
1047 | ||
9a7b2b0f | 1048 | if (!refdev) { |
1da177e4 | 1049 | ret = 1; |
9a7b2b0f | 1050 | } else { |
1da177e4 LT |
1051 | __u64 ev1, ev2; |
1052 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
1053 | if (!uuid_equal(refsb, sb)) { | |
1054 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1055 | b, bdevname(refdev->bdev,b2)); | |
1056 | goto abort; | |
1057 | } | |
1058 | if (!sb_equal(refsb, sb)) { | |
1059 | printk(KERN_WARNING "md: %s has same UUID" | |
1060 | " but different superblock to %s\n", | |
1061 | b, bdevname(refdev->bdev, b2)); | |
1062 | goto abort; | |
1063 | } | |
1064 | ev1 = md_event(sb); | |
1065 | ev2 = md_event(refsb); | |
1066 | if (ev1 > ev2) | |
1067 | ret = 1; | |
1068 | else | |
1069 | ret = 0; | |
1070 | } | |
8190e754 | 1071 | rdev->sectors = rdev->sb_start; |
1da177e4 | 1072 | |
dd8ac336 | 1073 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
1074 | /* "this cannot possibly happen" ... */ |
1075 | ret = -EINVAL; | |
1076 | ||
1da177e4 LT |
1077 | abort: |
1078 | return ret; | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * validate_super for 0.90.0 | |
1083 | */ | |
1084 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1085 | { | |
1086 | mdp_disk_t *desc; | |
1087 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 1088 | __u64 ev1 = md_event(sb); |
1da177e4 | 1089 | |
41158c7e | 1090 | rdev->raid_disk = -1; |
c5d79adb N |
1091 | clear_bit(Faulty, &rdev->flags); |
1092 | clear_bit(In_sync, &rdev->flags); | |
1093 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1094 | |
1da177e4 LT |
1095 | if (mddev->raid_disks == 0) { |
1096 | mddev->major_version = 0; | |
1097 | mddev->minor_version = sb->minor_version; | |
1098 | mddev->patch_version = sb->patch_version; | |
e691063a | 1099 | mddev->external = 0; |
9d8f0363 | 1100 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1101 | mddev->ctime = sb->ctime; |
1102 | mddev->utime = sb->utime; | |
1103 | mddev->level = sb->level; | |
d9d166c2 | 1104 | mddev->clevel[0] = 0; |
1da177e4 LT |
1105 | mddev->layout = sb->layout; |
1106 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1107 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1108 | mddev->events = ev1; |
c3d9714e N |
1109 | mddev->bitmap_info.offset = 0; |
1110 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1111 | |
f6705578 N |
1112 | if (mddev->minor_version >= 91) { |
1113 | mddev->reshape_position = sb->reshape_position; | |
1114 | mddev->delta_disks = sb->delta_disks; | |
1115 | mddev->new_level = sb->new_level; | |
1116 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1117 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1118 | } else { |
1119 | mddev->reshape_position = MaxSector; | |
1120 | mddev->delta_disks = 0; | |
1121 | mddev->new_level = mddev->level; | |
1122 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1123 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1124 | } |
1125 | ||
1da177e4 LT |
1126 | if (sb->state & (1<<MD_SB_CLEAN)) |
1127 | mddev->recovery_cp = MaxSector; | |
1128 | else { | |
1129 | if (sb->events_hi == sb->cp_events_hi && | |
1130 | sb->events_lo == sb->cp_events_lo) { | |
1131 | mddev->recovery_cp = sb->recovery_cp; | |
1132 | } else | |
1133 | mddev->recovery_cp = 0; | |
1134 | } | |
1135 | ||
1136 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1137 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1138 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1139 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1140 | ||
1141 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1142 | |
1143 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1144 | mddev->bitmap_info.file == NULL) |
1145 | mddev->bitmap_info.offset = | |
1146 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1147 | |
41158c7e | 1148 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1149 | /* Insist on good event counter while assembling, except |
1150 | * for spares (which don't need an event count) */ | |
1da177e4 | 1151 | ++ev1; |
be6800a7 N |
1152 | if (sb->disks[rdev->desc_nr].state & ( |
1153 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1154 | if (ev1 < mddev->events) | |
1155 | return -EINVAL; | |
41158c7e N |
1156 | } else if (mddev->bitmap) { |
1157 | /* if adding to array with a bitmap, then we can accept an | |
1158 | * older device ... but not too old. | |
1159 | */ | |
41158c7e N |
1160 | if (ev1 < mddev->bitmap->events_cleared) |
1161 | return 0; | |
07d84d10 N |
1162 | } else { |
1163 | if (ev1 < mddev->events) | |
1164 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1165 | return 0; | |
1166 | } | |
41158c7e | 1167 | |
1da177e4 | 1168 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1169 | desc = sb->disks + rdev->desc_nr; |
1170 | ||
1171 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1172 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1173 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1174 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1175 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1176 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1177 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1178 | /* active but not in sync implies recovery up to | |
1179 | * reshape position. We don't know exactly where | |
1180 | * that is, so set to zero for now */ | |
1181 | if (mddev->minor_version >= 91) { | |
1182 | rdev->recovery_offset = 0; | |
1183 | rdev->raid_disk = desc->raid_disk; | |
1184 | } | |
1da177e4 | 1185 | } |
8ddf9efe N |
1186 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1187 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1188 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1189 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1190 | return 0; |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * sync_super for 0.90.0 | |
1195 | */ | |
1196 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1197 | { | |
1198 | mdp_super_t *sb; | |
1da177e4 LT |
1199 | mdk_rdev_t *rdev2; |
1200 | int next_spare = mddev->raid_disks; | |
19133a42 | 1201 | |
1da177e4 LT |
1202 | |
1203 | /* make rdev->sb match mddev data.. | |
1204 | * | |
1205 | * 1/ zero out disks | |
1206 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1207 | * 3/ any empty disks < next_spare become removed | |
1208 | * | |
1209 | * disks[0] gets initialised to REMOVED because | |
1210 | * we cannot be sure from other fields if it has | |
1211 | * been initialised or not. | |
1212 | */ | |
1213 | int i; | |
1214 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1215 | ||
61181565 N |
1216 | rdev->sb_size = MD_SB_BYTES; |
1217 | ||
1da177e4 LT |
1218 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
1219 | ||
1220 | memset(sb, 0, sizeof(*sb)); | |
1221 | ||
1222 | sb->md_magic = MD_SB_MAGIC; | |
1223 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1224 | sb->patch_version = mddev->patch_version; |
1225 | sb->gvalid_words = 0; /* ignored */ | |
1226 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1227 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1228 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1229 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1230 | ||
1231 | sb->ctime = mddev->ctime; | |
1232 | sb->level = mddev->level; | |
58c0fed4 | 1233 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1234 | sb->raid_disks = mddev->raid_disks; |
1235 | sb->md_minor = mddev->md_minor; | |
e691063a | 1236 | sb->not_persistent = 0; |
1da177e4 LT |
1237 | sb->utime = mddev->utime; |
1238 | sb->state = 0; | |
1239 | sb->events_hi = (mddev->events>>32); | |
1240 | sb->events_lo = (u32)mddev->events; | |
1241 | ||
f6705578 N |
1242 | if (mddev->reshape_position == MaxSector) |
1243 | sb->minor_version = 90; | |
1244 | else { | |
1245 | sb->minor_version = 91; | |
1246 | sb->reshape_position = mddev->reshape_position; | |
1247 | sb->new_level = mddev->new_level; | |
1248 | sb->delta_disks = mddev->delta_disks; | |
1249 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1250 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1251 | } |
1252 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1253 | if (mddev->in_sync) |
1254 | { | |
1255 | sb->recovery_cp = mddev->recovery_cp; | |
1256 | sb->cp_events_hi = (mddev->events>>32); | |
1257 | sb->cp_events_lo = (u32)mddev->events; | |
1258 | if (mddev->recovery_cp == MaxSector) | |
1259 | sb->state = (1<< MD_SB_CLEAN); | |
1260 | } else | |
1261 | sb->recovery_cp = 0; | |
1262 | ||
1263 | sb->layout = mddev->layout; | |
9d8f0363 | 1264 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1265 | |
c3d9714e | 1266 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1267 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1268 | ||
1da177e4 | 1269 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1270 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1271 | mdp_disk_t *d; |
86e6ffdd | 1272 | int desc_nr; |
0261cd9f N |
1273 | int is_active = test_bit(In_sync, &rdev2->flags); |
1274 | ||
1275 | if (rdev2->raid_disk >= 0 && | |
1276 | sb->minor_version >= 91) | |
1277 | /* we have nowhere to store the recovery_offset, | |
1278 | * but if it is not below the reshape_position, | |
1279 | * we can piggy-back on that. | |
1280 | */ | |
1281 | is_active = 1; | |
1282 | if (rdev2->raid_disk < 0 || | |
1283 | test_bit(Faulty, &rdev2->flags)) | |
1284 | is_active = 0; | |
1285 | if (is_active) | |
86e6ffdd | 1286 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1287 | else |
86e6ffdd | 1288 | desc_nr = next_spare++; |
19133a42 | 1289 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1290 | d = &sb->disks[rdev2->desc_nr]; |
1291 | nr_disks++; | |
1292 | d->number = rdev2->desc_nr; | |
1293 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1294 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1295 | if (is_active) |
1da177e4 LT |
1296 | d->raid_disk = rdev2->raid_disk; |
1297 | else | |
1298 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1299 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1300 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1301 | else if (is_active) { |
1da177e4 | 1302 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1303 | if (test_bit(In_sync, &rdev2->flags)) |
1304 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1305 | active++; |
1306 | working++; | |
1307 | } else { | |
1308 | d->state = 0; | |
1309 | spare++; | |
1310 | working++; | |
1311 | } | |
8ddf9efe N |
1312 | if (test_bit(WriteMostly, &rdev2->flags)) |
1313 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1314 | } |
1da177e4 LT |
1315 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1316 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1317 | mdp_disk_t *d = &sb->disks[i]; | |
1318 | if (d->state == 0 && d->number == 0) { | |
1319 | d->number = i; | |
1320 | d->raid_disk = i; | |
1321 | d->state = (1<<MD_DISK_REMOVED); | |
1322 | d->state |= (1<<MD_DISK_FAULTY); | |
1323 | failed++; | |
1324 | } | |
1325 | } | |
1326 | sb->nr_disks = nr_disks; | |
1327 | sb->active_disks = active; | |
1328 | sb->working_disks = working; | |
1329 | sb->failed_disks = failed; | |
1330 | sb->spare_disks = spare; | |
1331 | ||
1332 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1333 | sb->sb_csum = calc_sb_csum(sb); | |
1334 | } | |
1335 | ||
0cd17fec CW |
1336 | /* |
1337 | * rdev_size_change for 0.90.0 | |
1338 | */ | |
1339 | static unsigned long long | |
15f4a5fd | 1340 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1341 | { |
58c0fed4 | 1342 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1343 | return 0; /* component must fit device */ |
c3d9714e | 1344 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1345 | return 0; /* can't move bitmap */ |
57b2caa3 | 1346 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1347 | if (!num_sectors || num_sectors > rdev->sb_start) |
1348 | num_sectors = rdev->sb_start; | |
0f420358 | 1349 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1350 | rdev->sb_page); |
1351 | md_super_wait(rdev->mddev); | |
c26a44ed | 1352 | return num_sectors; |
0cd17fec CW |
1353 | } |
1354 | ||
1355 | ||
1da177e4 LT |
1356 | /* |
1357 | * version 1 superblock | |
1358 | */ | |
1359 | ||
1c05b4bc | 1360 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1361 | { |
1c05b4bc N |
1362 | __le32 disk_csum; |
1363 | u32 csum; | |
1da177e4 LT |
1364 | unsigned long long newcsum; |
1365 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1366 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1367 | int i; |
1368 | ||
1369 | disk_csum = sb->sb_csum; | |
1370 | sb->sb_csum = 0; | |
1371 | newcsum = 0; | |
1372 | for (i=0; size>=4; size -= 4 ) | |
1373 | newcsum += le32_to_cpu(*isuper++); | |
1374 | ||
1375 | if (size == 2) | |
1c05b4bc | 1376 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1377 | |
1378 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1379 | sb->sb_csum = disk_csum; | |
1380 | return cpu_to_le32(csum); | |
1381 | } | |
1382 | ||
1383 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1384 | { | |
1385 | struct mdp_superblock_1 *sb; | |
1386 | int ret; | |
0f420358 | 1387 | sector_t sb_start; |
1da177e4 | 1388 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1389 | int bmask; |
1da177e4 LT |
1390 | |
1391 | /* | |
0f420358 | 1392 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1393 | * It is always aligned to a 4K boundary and |
1394 | * depeding on minor_version, it can be: | |
1395 | * 0: At least 8K, but less than 12K, from end of device | |
1396 | * 1: At start of device | |
1397 | * 2: 4K from start of device. | |
1398 | */ | |
1399 | switch(minor_version) { | |
1400 | case 0: | |
77304d2a | 1401 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1402 | sb_start -= 8*2; |
1403 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1404 | break; |
1405 | case 1: | |
0f420358 | 1406 | sb_start = 0; |
1da177e4 LT |
1407 | break; |
1408 | case 2: | |
0f420358 | 1409 | sb_start = 8; |
1da177e4 LT |
1410 | break; |
1411 | default: | |
1412 | return -EINVAL; | |
1413 | } | |
0f420358 | 1414 | rdev->sb_start = sb_start; |
1da177e4 | 1415 | |
0002b271 N |
1416 | /* superblock is rarely larger than 1K, but it can be larger, |
1417 | * and it is safe to read 4k, so we do that | |
1418 | */ | |
1419 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1420 | if (ret) return ret; |
1421 | ||
1422 | ||
1423 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1424 | ||
1425 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1426 | sb->major_version != cpu_to_le32(1) || | |
1427 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1428 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1429 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1430 | return -EINVAL; |
1431 | ||
1432 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1433 | printk("md: invalid superblock checksum on %s\n", | |
1434 | bdevname(rdev->bdev,b)); | |
1435 | return -EINVAL; | |
1436 | } | |
1437 | if (le64_to_cpu(sb->data_size) < 10) { | |
1438 | printk("md: data_size too small on %s\n", | |
1439 | bdevname(rdev->bdev,b)); | |
1440 | return -EINVAL; | |
1441 | } | |
e11e93fa | 1442 | |
1da177e4 LT |
1443 | rdev->preferred_minor = 0xffff; |
1444 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1445 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1446 | |
0002b271 | 1447 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1448 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1449 | if (rdev->sb_size & bmask) |
a1801f85 N |
1450 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1451 | ||
1452 | if (minor_version | |
0f420358 | 1453 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1454 | return -EINVAL; |
0002b271 | 1455 | |
31b65a0d N |
1456 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1457 | rdev->desc_nr = -1; | |
1458 | else | |
1459 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1460 | ||
9a7b2b0f | 1461 | if (!refdev) { |
8ed75463 | 1462 | ret = 1; |
9a7b2b0f | 1463 | } else { |
1da177e4 LT |
1464 | __u64 ev1, ev2; |
1465 | struct mdp_superblock_1 *refsb = | |
1466 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1467 | ||
1468 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1469 | sb->level != refsb->level || | |
1470 | sb->layout != refsb->layout || | |
1471 | sb->chunksize != refsb->chunksize) { | |
1472 | printk(KERN_WARNING "md: %s has strangely different" | |
1473 | " superblock to %s\n", | |
1474 | bdevname(rdev->bdev,b), | |
1475 | bdevname(refdev->bdev,b2)); | |
1476 | return -EINVAL; | |
1477 | } | |
1478 | ev1 = le64_to_cpu(sb->events); | |
1479 | ev2 = le64_to_cpu(refsb->events); | |
1480 | ||
1481 | if (ev1 > ev2) | |
8ed75463 N |
1482 | ret = 1; |
1483 | else | |
1484 | ret = 0; | |
1da177e4 | 1485 | } |
a1801f85 | 1486 | if (minor_version) |
77304d2a | 1487 | rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 1488 | le64_to_cpu(sb->data_offset); |
1da177e4 | 1489 | else |
dd8ac336 AN |
1490 | rdev->sectors = rdev->sb_start; |
1491 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1492 | return -EINVAL; |
dd8ac336 | 1493 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1494 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1495 | return -EINVAL; |
8ed75463 | 1496 | return ret; |
1da177e4 LT |
1497 | } |
1498 | ||
1499 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1500 | { | |
1501 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1502 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1503 | |
41158c7e | 1504 | rdev->raid_disk = -1; |
c5d79adb N |
1505 | clear_bit(Faulty, &rdev->flags); |
1506 | clear_bit(In_sync, &rdev->flags); | |
1507 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1508 | |
1da177e4 LT |
1509 | if (mddev->raid_disks == 0) { |
1510 | mddev->major_version = 1; | |
1511 | mddev->patch_version = 0; | |
e691063a | 1512 | mddev->external = 0; |
9d8f0363 | 1513 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1514 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1515 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1516 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1517 | mddev->clevel[0] = 0; |
1da177e4 LT |
1518 | mddev->layout = le32_to_cpu(sb->layout); |
1519 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1520 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1521 | mddev->events = ev1; |
c3d9714e N |
1522 | mddev->bitmap_info.offset = 0; |
1523 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1524 | |
1525 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1526 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1527 | ||
1528 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1529 | |
71c0805c | 1530 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1531 | mddev->bitmap_info.file == NULL ) |
1532 | mddev->bitmap_info.offset = | |
1533 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1534 | |
f6705578 N |
1535 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1536 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1537 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1538 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1539 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1540 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1541 | } else { |
1542 | mddev->reshape_position = MaxSector; | |
1543 | mddev->delta_disks = 0; | |
1544 | mddev->new_level = mddev->level; | |
1545 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1546 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1547 | } |
1548 | ||
41158c7e | 1549 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1550 | /* Insist of good event counter while assembling, except for |
1551 | * spares (which don't need an event count) */ | |
1da177e4 | 1552 | ++ev1; |
be6800a7 N |
1553 | if (rdev->desc_nr >= 0 && |
1554 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1555 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1556 | if (ev1 < mddev->events) | |
1557 | return -EINVAL; | |
41158c7e N |
1558 | } else if (mddev->bitmap) { |
1559 | /* If adding to array with a bitmap, then we can accept an | |
1560 | * older device, but not too old. | |
1561 | */ | |
41158c7e N |
1562 | if (ev1 < mddev->bitmap->events_cleared) |
1563 | return 0; | |
07d84d10 N |
1564 | } else { |
1565 | if (ev1 < mddev->events) | |
1566 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1567 | return 0; | |
1568 | } | |
1da177e4 LT |
1569 | if (mddev->level != LEVEL_MULTIPATH) { |
1570 | int role; | |
3673f305 N |
1571 | if (rdev->desc_nr < 0 || |
1572 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1573 | role = 0xffff; | |
1574 | rdev->desc_nr = -1; | |
1575 | } else | |
1576 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1577 | switch(role) { |
1578 | case 0xffff: /* spare */ | |
1da177e4 LT |
1579 | break; |
1580 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1581 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1582 | break; |
1583 | default: | |
5fd6c1dc N |
1584 | if ((le32_to_cpu(sb->feature_map) & |
1585 | MD_FEATURE_RECOVERY_OFFSET)) | |
1586 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1587 | else | |
1588 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1589 | rdev->raid_disk = role; |
1590 | break; | |
1591 | } | |
8ddf9efe N |
1592 | if (sb->devflags & WriteMostly1) |
1593 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1594 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1595 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1596 | |
1da177e4 LT |
1597 | return 0; |
1598 | } | |
1599 | ||
1600 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1601 | { | |
1602 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1603 | mdk_rdev_t *rdev2; |
1604 | int max_dev, i; | |
1605 | /* make rdev->sb match mddev and rdev data. */ | |
1606 | ||
1607 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1608 | ||
1609 | sb->feature_map = 0; | |
1610 | sb->pad0 = 0; | |
5fd6c1dc | 1611 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1612 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1613 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1614 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1615 | ||
1616 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1617 | sb->events = cpu_to_le64(mddev->events); | |
1618 | if (mddev->in_sync) | |
1619 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1620 | else | |
1621 | sb->resync_offset = cpu_to_le64(0); | |
1622 | ||
1c05b4bc | 1623 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1624 | |
f0ca340c | 1625 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1626 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1627 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1628 | sb->level = cpu_to_le32(mddev->level); |
1629 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1630 | |
c3d9714e N |
1631 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1632 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1633 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1634 | } |
5fd6c1dc N |
1635 | |
1636 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1637 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1638 | sb->feature_map |= |
1639 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1640 | sb->recovery_offset = | |
1641 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1642 | } |
1643 | ||
f6705578 N |
1644 | if (mddev->reshape_position != MaxSector) { |
1645 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1646 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1647 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1648 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1649 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1650 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1651 | } |
a654b9d8 | 1652 | |
1da177e4 | 1653 | max_dev = 0; |
159ec1fc | 1654 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1655 | if (rdev2->desc_nr+1 > max_dev) |
1656 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1657 | |
70471daf N |
1658 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1659 | int bmask; | |
a778b73f | 1660 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1661 | rdev->sb_size = max_dev * 2 + 256; |
1662 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1663 | if (rdev->sb_size & bmask) | |
1664 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1665 | } else |
1666 | max_dev = le32_to_cpu(sb->max_dev); | |
1667 | ||
1da177e4 LT |
1668 | for (i=0; i<max_dev;i++) |
1669 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1670 | ||
159ec1fc | 1671 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1672 | i = rdev2->desc_nr; |
b2d444d7 | 1673 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1674 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1675 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1676 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1677 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1678 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1679 | else |
1680 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1681 | } | |
1682 | ||
1da177e4 LT |
1683 | sb->sb_csum = calc_sb_1_csum(sb); |
1684 | } | |
1685 | ||
0cd17fec | 1686 | static unsigned long long |
15f4a5fd | 1687 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1688 | { |
1689 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1690 | sector_t max_sectors; |
58c0fed4 | 1691 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1692 | return 0; /* component must fit device */ |
0f420358 | 1693 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1694 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1695 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1696 | max_sectors -= rdev->data_offset; |
1697 | if (!num_sectors || num_sectors > max_sectors) | |
1698 | num_sectors = max_sectors; | |
c3d9714e | 1699 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1700 | /* minor version 0 with bitmap we can't move */ |
1701 | return 0; | |
1702 | } else { | |
1703 | /* minor version 0; superblock after data */ | |
0f420358 | 1704 | sector_t sb_start; |
77304d2a | 1705 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1706 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1707 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1708 | if (!num_sectors || num_sectors > max_sectors) |
1709 | num_sectors = max_sectors; | |
0f420358 | 1710 | rdev->sb_start = sb_start; |
0cd17fec CW |
1711 | } |
1712 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1713 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1714 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1715 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1716 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1717 | rdev->sb_page); |
1718 | md_super_wait(rdev->mddev); | |
c26a44ed | 1719 | return num_sectors; |
0cd17fec | 1720 | } |
1da177e4 | 1721 | |
75c96f85 | 1722 | static struct super_type super_types[] = { |
1da177e4 LT |
1723 | [0] = { |
1724 | .name = "0.90.0", | |
1725 | .owner = THIS_MODULE, | |
0cd17fec CW |
1726 | .load_super = super_90_load, |
1727 | .validate_super = super_90_validate, | |
1728 | .sync_super = super_90_sync, | |
1729 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1730 | }, |
1731 | [1] = { | |
1732 | .name = "md-1", | |
1733 | .owner = THIS_MODULE, | |
0cd17fec CW |
1734 | .load_super = super_1_load, |
1735 | .validate_super = super_1_validate, | |
1736 | .sync_super = super_1_sync, | |
1737 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1738 | }, |
1739 | }; | |
1da177e4 LT |
1740 | |
1741 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1742 | { | |
7dd5e7c3 | 1743 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1744 | |
4b80991c N |
1745 | rcu_read_lock(); |
1746 | rdev_for_each_rcu(rdev, mddev1) | |
1747 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1748 | if (rdev->bdev->bd_contains == |
4b80991c N |
1749 | rdev2->bdev->bd_contains) { |
1750 | rcu_read_unlock(); | |
7dd5e7c3 | 1751 | return 1; |
4b80991c N |
1752 | } |
1753 | rcu_read_unlock(); | |
1da177e4 LT |
1754 | return 0; |
1755 | } | |
1756 | ||
1757 | static LIST_HEAD(pending_raid_disks); | |
1758 | ||
ac5e7113 AN |
1759 | /* |
1760 | * Try to register data integrity profile for an mddev | |
1761 | * | |
1762 | * This is called when an array is started and after a disk has been kicked | |
1763 | * from the array. It only succeeds if all working and active component devices | |
1764 | * are integrity capable with matching profiles. | |
1765 | */ | |
1766 | int md_integrity_register(mddev_t *mddev) | |
1767 | { | |
1768 | mdk_rdev_t *rdev, *reference = NULL; | |
1769 | ||
1770 | if (list_empty(&mddev->disks)) | |
1771 | return 0; /* nothing to do */ | |
1772 | if (blk_get_integrity(mddev->gendisk)) | |
1773 | return 0; /* already registered */ | |
1774 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1775 | /* skip spares and non-functional disks */ | |
1776 | if (test_bit(Faulty, &rdev->flags)) | |
1777 | continue; | |
1778 | if (rdev->raid_disk < 0) | |
1779 | continue; | |
ac5e7113 AN |
1780 | if (!reference) { |
1781 | /* Use the first rdev as the reference */ | |
1782 | reference = rdev; | |
1783 | continue; | |
1784 | } | |
1785 | /* does this rdev's profile match the reference profile? */ | |
1786 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1787 | rdev->bdev->bd_disk) < 0) | |
1788 | return -EINVAL; | |
1789 | } | |
89078d57 MP |
1790 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1791 | return 0; | |
ac5e7113 AN |
1792 | /* |
1793 | * All component devices are integrity capable and have matching | |
1794 | * profiles, register the common profile for the md device. | |
1795 | */ | |
1796 | if (blk_integrity_register(mddev->gendisk, | |
1797 | bdev_get_integrity(reference->bdev)) != 0) { | |
1798 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1799 | mdname(mddev)); | |
1800 | return -EINVAL; | |
1801 | } | |
a91a2785 MP |
1802 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1803 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1804 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1805 | mdname(mddev)); | |
1806 | return -EINVAL; | |
1807 | } | |
ac5e7113 AN |
1808 | return 0; |
1809 | } | |
1810 | EXPORT_SYMBOL(md_integrity_register); | |
1811 | ||
1812 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1813 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1814 | { |
3f9d99c1 | 1815 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1816 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1817 | |
ac5e7113 | 1818 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1819 | return; |
ac5e7113 | 1820 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1821 | return; |
ac5e7113 AN |
1822 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1823 | rdev->bdev->bd_disk) >= 0) | |
1824 | return; | |
1825 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1826 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1827 | } |
ac5e7113 | 1828 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1829 | |
1da177e4 LT |
1830 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1831 | { | |
7dd5e7c3 | 1832 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1833 | struct kobject *ko; |
1edf80d3 | 1834 | char *s; |
5e55e2f5 | 1835 | int err; |
1da177e4 LT |
1836 | |
1837 | if (rdev->mddev) { | |
1838 | MD_BUG(); | |
1839 | return -EINVAL; | |
1840 | } | |
11e2ede0 DW |
1841 | |
1842 | /* prevent duplicates */ | |
1843 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1844 | return -EEXIST; | |
1845 | ||
dd8ac336 AN |
1846 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1847 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1848 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1849 | if (mddev->pers) { |
1850 | /* Cannot change size, so fail | |
1851 | * If mddev->level <= 0, then we don't care | |
1852 | * about aligning sizes (e.g. linear) | |
1853 | */ | |
1854 | if (mddev->level > 0) | |
1855 | return -ENOSPC; | |
1856 | } else | |
dd8ac336 | 1857 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1858 | } |
1da177e4 LT |
1859 | |
1860 | /* Verify rdev->desc_nr is unique. | |
1861 | * If it is -1, assign a free number, else | |
1862 | * check number is not in use | |
1863 | */ | |
1864 | if (rdev->desc_nr < 0) { | |
1865 | int choice = 0; | |
1866 | if (mddev->pers) choice = mddev->raid_disks; | |
1867 | while (find_rdev_nr(mddev, choice)) | |
1868 | choice++; | |
1869 | rdev->desc_nr = choice; | |
1870 | } else { | |
1871 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1872 | return -EBUSY; | |
1873 | } | |
de01dfad N |
1874 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1875 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1876 | mdname(mddev), mddev->max_disks); | |
1877 | return -EBUSY; | |
1878 | } | |
19133a42 | 1879 | bdevname(rdev->bdev,b); |
649316b2 | 1880 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1881 | *s = '!'; |
649316b2 | 1882 | |
1da177e4 | 1883 | rdev->mddev = mddev; |
19133a42 | 1884 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1885 | |
b2d6db58 | 1886 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1887 | goto fail; |
86e6ffdd | 1888 | |
0762b8bd | 1889 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
1890 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
1891 | /* failure here is OK */; | |
1892 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 1893 | |
4b80991c | 1894 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 1895 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
1896 | |
1897 | /* May as well allow recovery to be retried once */ | |
1898 | mddev->recovery_disabled = 0; | |
3f9d99c1 | 1899 | |
1da177e4 | 1900 | return 0; |
5e55e2f5 N |
1901 | |
1902 | fail: | |
1903 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1904 | b, mdname(mddev)); | |
1905 | return err; | |
1da177e4 LT |
1906 | } |
1907 | ||
177a99b2 | 1908 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1909 | { |
1910 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1911 | kobject_del(&rdev->kobj); | |
177a99b2 | 1912 | kobject_put(&rdev->kobj); |
5792a285 N |
1913 | } |
1914 | ||
1da177e4 LT |
1915 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1916 | { | |
1917 | char b[BDEVNAME_SIZE]; | |
1918 | if (!rdev->mddev) { | |
1919 | MD_BUG(); | |
1920 | return; | |
1921 | } | |
49731baa | 1922 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1923 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1924 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1925 | rdev->mddev = NULL; | |
86e6ffdd | 1926 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1927 | sysfs_put(rdev->sysfs_state); |
1928 | rdev->sysfs_state = NULL; | |
5792a285 | 1929 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1930 | * writing to 'remove' to "dev/state". We also need |
1931 | * to delay it due to rcu usage. | |
5792a285 | 1932 | */ |
4b80991c | 1933 | synchronize_rcu(); |
177a99b2 N |
1934 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1935 | kobject_get(&rdev->kobj); | |
e804ac78 | 1936 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
1937 | } |
1938 | ||
1939 | /* | |
1940 | * prevent the device from being mounted, repartitioned or | |
1941 | * otherwise reused by a RAID array (or any other kernel | |
1942 | * subsystem), by bd_claiming the device. | |
1943 | */ | |
c5d79adb | 1944 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1945 | { |
1946 | int err = 0; | |
1947 | struct block_device *bdev; | |
1948 | char b[BDEVNAME_SIZE]; | |
1949 | ||
d4d77629 TH |
1950 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
1951 | shared ? (mdk_rdev_t *)lock_rdev : rdev); | |
1da177e4 LT |
1952 | if (IS_ERR(bdev)) { |
1953 | printk(KERN_ERR "md: could not open %s.\n", | |
1954 | __bdevname(dev, b)); | |
1955 | return PTR_ERR(bdev); | |
1956 | } | |
1da177e4 LT |
1957 | rdev->bdev = bdev; |
1958 | return err; | |
1959 | } | |
1960 | ||
1961 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1962 | { | |
1963 | struct block_device *bdev = rdev->bdev; | |
1964 | rdev->bdev = NULL; | |
1965 | if (!bdev) | |
1966 | MD_BUG(); | |
e525fd89 | 1967 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
1968 | } |
1969 | ||
1970 | void md_autodetect_dev(dev_t dev); | |
1971 | ||
1972 | static void export_rdev(mdk_rdev_t * rdev) | |
1973 | { | |
1974 | char b[BDEVNAME_SIZE]; | |
1975 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1976 | bdevname(rdev->bdev,b)); | |
1977 | if (rdev->mddev) | |
1978 | MD_BUG(); | |
1979 | free_disk_sb(rdev); | |
1da177e4 | 1980 | #ifndef MODULE |
d0fae18f N |
1981 | if (test_bit(AutoDetected, &rdev->flags)) |
1982 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1983 | #endif |
1984 | unlock_rdev(rdev); | |
86e6ffdd | 1985 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1986 | } |
1987 | ||
1988 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1989 | { | |
1990 | unbind_rdev_from_array(rdev); | |
1991 | export_rdev(rdev); | |
1992 | } | |
1993 | ||
1994 | static void export_array(mddev_t *mddev) | |
1995 | { | |
159ec1fc | 1996 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1997 | |
d089c6af | 1998 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1999 | if (!rdev->mddev) { |
2000 | MD_BUG(); | |
2001 | continue; | |
2002 | } | |
2003 | kick_rdev_from_array(rdev); | |
2004 | } | |
2005 | if (!list_empty(&mddev->disks)) | |
2006 | MD_BUG(); | |
2007 | mddev->raid_disks = 0; | |
2008 | mddev->major_version = 0; | |
2009 | } | |
2010 | ||
2011 | static void print_desc(mdp_disk_t *desc) | |
2012 | { | |
2013 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2014 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2015 | } | |
2016 | ||
cd2ac932 | 2017 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2018 | { |
2019 | int i; | |
2020 | ||
2021 | printk(KERN_INFO | |
2022 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2023 | sb->major_version, sb->minor_version, sb->patch_version, | |
2024 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2025 | sb->ctime); | |
2026 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2027 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2028 | sb->md_minor, sb->layout, sb->chunk_size); | |
2029 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2030 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2031 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2032 | sb->failed_disks, sb->spare_disks, | |
2033 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2034 | ||
2035 | printk(KERN_INFO); | |
2036 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2037 | mdp_disk_t *desc; | |
2038 | ||
2039 | desc = sb->disks + i; | |
2040 | if (desc->number || desc->major || desc->minor || | |
2041 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2042 | printk(" D %2d: ", i); | |
2043 | print_desc(desc); | |
2044 | } | |
2045 | } | |
2046 | printk(KERN_INFO "md: THIS: "); | |
2047 | print_desc(&sb->this_disk); | |
cd2ac932 | 2048 | } |
1da177e4 | 2049 | |
cd2ac932 CR |
2050 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2051 | { | |
2052 | __u8 *uuid; | |
2053 | ||
2054 | uuid = sb->set_uuid; | |
ad361c98 | 2055 | printk(KERN_INFO |
7b75c2f8 | 2056 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2057 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2058 | le32_to_cpu(sb->major_version), |
2059 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2060 | uuid, |
cd2ac932 CR |
2061 | sb->set_name, |
2062 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2063 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2064 | ||
2065 | uuid = sb->device_uuid; | |
ad361c98 JP |
2066 | printk(KERN_INFO |
2067 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2068 | " RO:%llu\n" |
7b75c2f8 | 2069 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2070 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2071 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2072 | le32_to_cpu(sb->level), |
2073 | (unsigned long long)le64_to_cpu(sb->size), | |
2074 | le32_to_cpu(sb->raid_disks), | |
2075 | le32_to_cpu(sb->layout), | |
2076 | le32_to_cpu(sb->chunksize), | |
2077 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2078 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2079 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2080 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2081 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2082 | uuid, |
cd2ac932 CR |
2083 | sb->devflags, |
2084 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2085 | (unsigned long long)le64_to_cpu(sb->events), | |
2086 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2087 | le32_to_cpu(sb->sb_csum), | |
2088 | le32_to_cpu(sb->max_dev) | |
2089 | ); | |
1da177e4 LT |
2090 | } |
2091 | ||
cd2ac932 | 2092 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2093 | { |
2094 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2095 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2096 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2097 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2098 | rdev->desc_nr); | |
1da177e4 | 2099 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2100 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2101 | switch (major_version) { | |
2102 | case 0: | |
2103 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
2104 | break; | |
2105 | case 1: | |
2106 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
2107 | break; | |
2108 | } | |
1da177e4 LT |
2109 | } else |
2110 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2111 | } | |
2112 | ||
5e56341d | 2113 | static void md_print_devices(void) |
1da177e4 | 2114 | { |
159ec1fc | 2115 | struct list_head *tmp; |
1da177e4 LT |
2116 | mdk_rdev_t *rdev; |
2117 | mddev_t *mddev; | |
2118 | char b[BDEVNAME_SIZE]; | |
2119 | ||
2120 | printk("\n"); | |
2121 | printk("md: **********************************\n"); | |
2122 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2123 | printk("md: **********************************\n"); | |
29ac4aa3 | 2124 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2125 | |
32a7627c N |
2126 | if (mddev->bitmap) |
2127 | bitmap_print_sb(mddev->bitmap); | |
2128 | else | |
2129 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2130 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2131 | printk("<%s>", bdevname(rdev->bdev,b)); |
2132 | printk("\n"); | |
2133 | ||
159ec1fc | 2134 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2135 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2136 | } |
2137 | printk("md: **********************************\n"); | |
2138 | printk("\n"); | |
2139 | } | |
2140 | ||
2141 | ||
42543769 | 2142 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2143 | { |
42543769 N |
2144 | /* Update each superblock (in-memory image), but |
2145 | * if we are allowed to, skip spares which already | |
2146 | * have the right event counter, or have one earlier | |
2147 | * (which would mean they aren't being marked as dirty | |
2148 | * with the rest of the array) | |
2149 | */ | |
1da177e4 | 2150 | mdk_rdev_t *rdev; |
159ec1fc | 2151 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2152 | if (rdev->sb_events == mddev->events || |
2153 | (nospares && | |
2154 | rdev->raid_disk < 0 && | |
42543769 N |
2155 | rdev->sb_events+1 == mddev->events)) { |
2156 | /* Don't update this superblock */ | |
2157 | rdev->sb_loaded = 2; | |
2158 | } else { | |
2159 | super_types[mddev->major_version]. | |
2160 | sync_super(mddev, rdev); | |
2161 | rdev->sb_loaded = 1; | |
2162 | } | |
1da177e4 LT |
2163 | } |
2164 | } | |
2165 | ||
850b2b42 | 2166 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2167 | { |
1da177e4 | 2168 | mdk_rdev_t *rdev; |
06d91a5f | 2169 | int sync_req; |
42543769 | 2170 | int nospares = 0; |
1da177e4 | 2171 | |
1da177e4 | 2172 | repeat: |
3a3a5ddb N |
2173 | /* First make sure individual recovery_offsets are correct */ |
2174 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2175 | if (rdev->raid_disk >= 0 && | |
2176 | mddev->delta_disks >= 0 && | |
2177 | !test_bit(In_sync, &rdev->flags) && | |
2178 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2179 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2180 | ||
2181 | } | |
bd52b746 | 2182 | if (!mddev->persistent) { |
070dc6dd | 2183 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2184 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
d97a41dc N |
2185 | if (!mddev->external) |
2186 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3a3a5ddb N |
2187 | wake_up(&mddev->sb_wait); |
2188 | return; | |
2189 | } | |
2190 | ||
a9701a30 | 2191 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2192 | |
3a3a5ddb N |
2193 | mddev->utime = get_seconds(); |
2194 | ||
850b2b42 N |
2195 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2196 | force_change = 1; | |
2197 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2198 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2199 | * though if events isn't the right even/odd, we will have to do | |
2200 | * spares after all | |
2201 | */ | |
2202 | nospares = 1; | |
2203 | if (force_change) | |
2204 | nospares = 0; | |
2205 | if (mddev->degraded) | |
84692195 N |
2206 | /* If the array is degraded, then skipping spares is both |
2207 | * dangerous and fairly pointless. | |
2208 | * Dangerous because a device that was removed from the array | |
2209 | * might have a event_count that still looks up-to-date, | |
2210 | * so it can be re-added without a resync. | |
2211 | * Pointless because if there are any spares to skip, | |
2212 | * then a recovery will happen and soon that array won't | |
2213 | * be degraded any more and the spare can go back to sleep then. | |
2214 | */ | |
850b2b42 | 2215 | nospares = 0; |
84692195 | 2216 | |
06d91a5f | 2217 | sync_req = mddev->in_sync; |
42543769 N |
2218 | |
2219 | /* If this is just a dirty<->clean transition, and the array is clean | |
2220 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2221 | if (nospares |
42543769 | 2222 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2223 | && mddev->can_decrease_events |
2224 | && mddev->events != 1) { | |
42543769 | 2225 | mddev->events--; |
a8707c08 N |
2226 | mddev->can_decrease_events = 0; |
2227 | } else { | |
42543769 N |
2228 | /* otherwise we have to go forward and ... */ |
2229 | mddev->events ++; | |
a8707c08 | 2230 | mddev->can_decrease_events = nospares; |
42543769 | 2231 | } |
1da177e4 LT |
2232 | |
2233 | if (!mddev->events) { | |
2234 | /* | |
2235 | * oops, this 64-bit counter should never wrap. | |
2236 | * Either we are in around ~1 trillion A.C., assuming | |
2237 | * 1 reboot per second, or we have a bug: | |
2238 | */ | |
2239 | MD_BUG(); | |
2240 | mddev->events --; | |
2241 | } | |
e691063a | 2242 | sync_sbs(mddev, nospares); |
a9701a30 | 2243 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2244 | |
2245 | dprintk(KERN_INFO | |
2246 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2247 | mdname(mddev),mddev->in_sync); | |
2248 | ||
4ad13663 | 2249 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2250 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2251 | char b[BDEVNAME_SIZE]; |
2252 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2253 | if (rdev->sb_loaded != 1) |
2254 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2255 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2256 | dprintk("(skipping faulty "); |
2257 | ||
2258 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2259 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2260 | md_super_write(mddev,rdev, |
0f420358 | 2261 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2262 | rdev->sb_page); |
2263 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2264 | bdevname(rdev->bdev,b), | |
0f420358 | 2265 | (unsigned long long)rdev->sb_start); |
42543769 | 2266 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2267 | |
1da177e4 LT |
2268 | } else |
2269 | dprintk(")\n"); | |
7bfa19f2 | 2270 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2271 | /* only need to write one superblock... */ |
2272 | break; | |
2273 | } | |
a9701a30 | 2274 | md_super_wait(mddev); |
850b2b42 | 2275 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2276 | |
a9701a30 | 2277 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2278 | if (mddev->in_sync != sync_req || |
2279 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2280 | /* have to write it out again */ |
a9701a30 | 2281 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2282 | goto repeat; |
2283 | } | |
850b2b42 | 2284 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2285 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2286 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2287 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2288 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2289 | |
1da177e4 LT |
2290 | } |
2291 | ||
7f6ce769 | 2292 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2293 | * We want to accept with case. For this we use cmd_match. |
2294 | */ | |
2295 | static int cmd_match(const char *cmd, const char *str) | |
2296 | { | |
2297 | /* See if cmd, written into a sysfs file, matches | |
2298 | * str. They must either be the same, or cmd can | |
2299 | * have a trailing newline | |
2300 | */ | |
2301 | while (*cmd && *str && *cmd == *str) { | |
2302 | cmd++; | |
2303 | str++; | |
2304 | } | |
2305 | if (*cmd == '\n') | |
2306 | cmd++; | |
2307 | if (*str || *cmd) | |
2308 | return 0; | |
2309 | return 1; | |
2310 | } | |
2311 | ||
86e6ffdd N |
2312 | struct rdev_sysfs_entry { |
2313 | struct attribute attr; | |
2314 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2315 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2316 | }; | |
2317 | ||
2318 | static ssize_t | |
96de1e66 | 2319 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2320 | { |
2321 | char *sep = ""; | |
20a49ff6 | 2322 | size_t len = 0; |
86e6ffdd | 2323 | |
b2d444d7 | 2324 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2325 | len+= sprintf(page+len, "%sfaulty",sep); |
2326 | sep = ","; | |
2327 | } | |
b2d444d7 | 2328 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2329 | len += sprintf(page+len, "%sin_sync",sep); |
2330 | sep = ","; | |
2331 | } | |
f655675b N |
2332 | if (test_bit(WriteMostly, &rdev->flags)) { |
2333 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2334 | sep = ","; | |
2335 | } | |
6bfe0b49 DW |
2336 | if (test_bit(Blocked, &rdev->flags)) { |
2337 | len += sprintf(page+len, "%sblocked", sep); | |
2338 | sep = ","; | |
2339 | } | |
b2d444d7 N |
2340 | if (!test_bit(Faulty, &rdev->flags) && |
2341 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2342 | len += sprintf(page+len, "%sspare", sep); |
2343 | sep = ","; | |
2344 | } | |
2345 | return len+sprintf(page+len, "\n"); | |
2346 | } | |
2347 | ||
45dc2de1 N |
2348 | static ssize_t |
2349 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2350 | { | |
2351 | /* can write | |
2352 | * faulty - simulates and error | |
2353 | * remove - disconnects the device | |
f655675b N |
2354 | * writemostly - sets write_mostly |
2355 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2356 | * blocked - sets the Blocked flag |
2357 | * -blocked - clears the Blocked flag | |
6d56e278 | 2358 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2359 | */ |
2360 | int err = -EINVAL; | |
2361 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2362 | md_error(rdev->mddev, rdev); | |
2363 | err = 0; | |
2364 | } else if (cmd_match(buf, "remove")) { | |
2365 | if (rdev->raid_disk >= 0) | |
2366 | err = -EBUSY; | |
2367 | else { | |
2368 | mddev_t *mddev = rdev->mddev; | |
2369 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2370 | if (mddev->pers) |
2371 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2372 | md_new_event(mddev); |
2373 | err = 0; | |
2374 | } | |
f655675b N |
2375 | } else if (cmd_match(buf, "writemostly")) { |
2376 | set_bit(WriteMostly, &rdev->flags); | |
2377 | err = 0; | |
2378 | } else if (cmd_match(buf, "-writemostly")) { | |
2379 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2380 | err = 0; |
2381 | } else if (cmd_match(buf, "blocked")) { | |
2382 | set_bit(Blocked, &rdev->flags); | |
2383 | err = 0; | |
2384 | } else if (cmd_match(buf, "-blocked")) { | |
2385 | clear_bit(Blocked, &rdev->flags); | |
2386 | wake_up(&rdev->blocked_wait); | |
2387 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2388 | md_wakeup_thread(rdev->mddev->thread); | |
2389 | ||
6d56e278 N |
2390 | err = 0; |
2391 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2392 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2393 | err = 0; |
45dc2de1 | 2394 | } |
00bcb4ac N |
2395 | if (!err) |
2396 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2397 | return err ? err : len; |
2398 | } | |
80ca3a44 N |
2399 | static struct rdev_sysfs_entry rdev_state = |
2400 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2401 | |
4dbcdc75 N |
2402 | static ssize_t |
2403 | errors_show(mdk_rdev_t *rdev, char *page) | |
2404 | { | |
2405 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2406 | } | |
2407 | ||
2408 | static ssize_t | |
2409 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2410 | { | |
2411 | char *e; | |
2412 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2413 | if (*buf && (*e == 0 || *e == '\n')) { | |
2414 | atomic_set(&rdev->corrected_errors, n); | |
2415 | return len; | |
2416 | } | |
2417 | return -EINVAL; | |
2418 | } | |
2419 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2420 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2421 | |
014236d2 N |
2422 | static ssize_t |
2423 | slot_show(mdk_rdev_t *rdev, char *page) | |
2424 | { | |
2425 | if (rdev->raid_disk < 0) | |
2426 | return sprintf(page, "none\n"); | |
2427 | else | |
2428 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2429 | } | |
2430 | ||
2431 | static ssize_t | |
2432 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2433 | { | |
2434 | char *e; | |
c303da6d N |
2435 | int err; |
2436 | char nm[20]; | |
014236d2 N |
2437 | int slot = simple_strtoul(buf, &e, 10); |
2438 | if (strncmp(buf, "none", 4)==0) | |
2439 | slot = -1; | |
2440 | else if (e==buf || (*e && *e!= '\n')) | |
2441 | return -EINVAL; | |
6c2fce2e | 2442 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2443 | /* Setting 'slot' on an active array requires also |
2444 | * updating the 'rd%d' link, and communicating | |
2445 | * with the personality with ->hot_*_disk. | |
2446 | * For now we only support removing | |
2447 | * failed/spare devices. This normally happens automatically, | |
2448 | * but not when the metadata is externally managed. | |
2449 | */ | |
c303da6d N |
2450 | if (rdev->raid_disk == -1) |
2451 | return -EEXIST; | |
2452 | /* personality does all needed checks */ | |
2453 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2454 | return -EINVAL; | |
2455 | err = rdev->mddev->pers-> | |
2456 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2457 | if (err) | |
2458 | return err; | |
2459 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2460 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
b7103107 | 2461 | rdev->raid_disk = -1; |
c303da6d N |
2462 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2463 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2464 | } else if (rdev->mddev->pers) { |
2465 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2466 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2467 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2468 | */ |
2469 | ||
2470 | if (rdev->raid_disk != -1) | |
2471 | return -EBUSY; | |
2472 | ||
c6751b2b N |
2473 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2474 | return -EBUSY; | |
2475 | ||
6c2fce2e NB |
2476 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2477 | return -EINVAL; | |
2478 | ||
159ec1fc | 2479 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2480 | if (rdev2->raid_disk == slot) |
2481 | return -EEXIST; | |
2482 | ||
ba1b41b6 N |
2483 | if (slot >= rdev->mddev->raid_disks && |
2484 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2485 | return -ENOSPC; | |
2486 | ||
6c2fce2e NB |
2487 | rdev->raid_disk = slot; |
2488 | if (test_bit(In_sync, &rdev->flags)) | |
2489 | rdev->saved_raid_disk = slot; | |
2490 | else | |
2491 | rdev->saved_raid_disk = -1; | |
2492 | err = rdev->mddev->pers-> | |
2493 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2494 | if (err) { |
6c2fce2e | 2495 | rdev->raid_disk = -1; |
6c2fce2e | 2496 | return err; |
52664732 | 2497 | } else |
00bcb4ac | 2498 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6c2fce2e NB |
2499 | sprintf(nm, "rd%d", rdev->raid_disk); |
2500 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
00bcb4ac | 2501 | /* failure here is OK */; |
6c2fce2e | 2502 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2503 | } else { |
ba1b41b6 N |
2504 | if (slot >= rdev->mddev->raid_disks && |
2505 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2506 | return -ENOSPC; |
2507 | rdev->raid_disk = slot; | |
2508 | /* assume it is working */ | |
c5d79adb N |
2509 | clear_bit(Faulty, &rdev->flags); |
2510 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2511 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2512 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2513 | } |
014236d2 N |
2514 | return len; |
2515 | } | |
2516 | ||
2517 | ||
2518 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2519 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2520 | |
93c8cad0 N |
2521 | static ssize_t |
2522 | offset_show(mdk_rdev_t *rdev, char *page) | |
2523 | { | |
6961ece4 | 2524 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2525 | } |
2526 | ||
2527 | static ssize_t | |
2528 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2529 | { | |
2530 | char *e; | |
2531 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2532 | if (e==buf || (*e && *e != '\n')) | |
2533 | return -EINVAL; | |
8ed0a521 | 2534 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2535 | return -EBUSY; |
dd8ac336 | 2536 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2537 | /* Must set offset before size, so overlap checks |
2538 | * can be sane */ | |
2539 | return -EBUSY; | |
93c8cad0 N |
2540 | rdev->data_offset = offset; |
2541 | return len; | |
2542 | } | |
2543 | ||
2544 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2545 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2546 | |
83303b61 N |
2547 | static ssize_t |
2548 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2549 | { | |
dd8ac336 | 2550 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2551 | } |
2552 | ||
c5d79adb N |
2553 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2554 | { | |
2555 | /* check if two start/length pairs overlap */ | |
2556 | if (s1+l1 <= s2) | |
2557 | return 0; | |
2558 | if (s2+l2 <= s1) | |
2559 | return 0; | |
2560 | return 1; | |
2561 | } | |
2562 | ||
b522adcd DW |
2563 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2564 | { | |
2565 | unsigned long long blocks; | |
2566 | sector_t new; | |
2567 | ||
2568 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2569 | return -EINVAL; | |
2570 | ||
2571 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2572 | return -EINVAL; /* sector conversion overflow */ | |
2573 | ||
2574 | new = blocks * 2; | |
2575 | if (new != blocks * 2) | |
2576 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2577 | ||
2578 | *sectors = new; | |
2579 | return 0; | |
2580 | } | |
2581 | ||
83303b61 N |
2582 | static ssize_t |
2583 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2584 | { | |
27c529bb | 2585 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2586 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2587 | sector_t sectors; |
27c529bb | 2588 | |
b522adcd | 2589 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2590 | return -EINVAL; |
0cd17fec | 2591 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2592 | if (my_mddev->persistent) { |
dd8ac336 AN |
2593 | sectors = super_types[my_mddev->major_version]. |
2594 | rdev_size_change(rdev, sectors); | |
2595 | if (!sectors) | |
0cd17fec | 2596 | return -EBUSY; |
dd8ac336 | 2597 | } else if (!sectors) |
77304d2a | 2598 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2599 | rdev->data_offset; |
0cd17fec | 2600 | } |
dd8ac336 | 2601 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2602 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2603 | |
dd8ac336 AN |
2604 | rdev->sectors = sectors; |
2605 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2606 | /* need to check that all other rdevs with the same ->bdev |
2607 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2608 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2609 | * we have to change it back, we will have the lock again. |
2610 | */ | |
2611 | mddev_t *mddev; | |
2612 | int overlap = 0; | |
159ec1fc | 2613 | struct list_head *tmp; |
c5d79adb | 2614 | |
27c529bb | 2615 | mddev_unlock(my_mddev); |
29ac4aa3 | 2616 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2617 | mdk_rdev_t *rdev2; |
2618 | ||
2619 | mddev_lock(mddev); | |
159ec1fc | 2620 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
f21e9ff7 N |
2621 | if (rdev->bdev == rdev2->bdev && |
2622 | rdev != rdev2 && | |
2623 | overlaps(rdev->data_offset, rdev->sectors, | |
2624 | rdev2->data_offset, | |
2625 | rdev2->sectors)) { | |
c5d79adb N |
2626 | overlap = 1; |
2627 | break; | |
2628 | } | |
2629 | mddev_unlock(mddev); | |
2630 | if (overlap) { | |
2631 | mddev_put(mddev); | |
2632 | break; | |
2633 | } | |
2634 | } | |
27c529bb | 2635 | mddev_lock(my_mddev); |
c5d79adb N |
2636 | if (overlap) { |
2637 | /* Someone else could have slipped in a size | |
2638 | * change here, but doing so is just silly. | |
dd8ac336 | 2639 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2640 | * safe, and trust userspace not to race with |
2641 | * itself | |
2642 | */ | |
dd8ac336 | 2643 | rdev->sectors = oldsectors; |
c5d79adb N |
2644 | return -EBUSY; |
2645 | } | |
2646 | } | |
83303b61 N |
2647 | return len; |
2648 | } | |
2649 | ||
2650 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2651 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2652 | |
06e3c817 DW |
2653 | |
2654 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2655 | { | |
2656 | unsigned long long recovery_start = rdev->recovery_offset; | |
2657 | ||
2658 | if (test_bit(In_sync, &rdev->flags) || | |
2659 | recovery_start == MaxSector) | |
2660 | return sprintf(page, "none\n"); | |
2661 | ||
2662 | return sprintf(page, "%llu\n", recovery_start); | |
2663 | } | |
2664 | ||
2665 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2666 | { | |
2667 | unsigned long long recovery_start; | |
2668 | ||
2669 | if (cmd_match(buf, "none")) | |
2670 | recovery_start = MaxSector; | |
2671 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2672 | return -EINVAL; | |
2673 | ||
2674 | if (rdev->mddev->pers && | |
2675 | rdev->raid_disk >= 0) | |
2676 | return -EBUSY; | |
2677 | ||
2678 | rdev->recovery_offset = recovery_start; | |
2679 | if (recovery_start == MaxSector) | |
2680 | set_bit(In_sync, &rdev->flags); | |
2681 | else | |
2682 | clear_bit(In_sync, &rdev->flags); | |
2683 | return len; | |
2684 | } | |
2685 | ||
2686 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2687 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2688 | ||
86e6ffdd N |
2689 | static struct attribute *rdev_default_attrs[] = { |
2690 | &rdev_state.attr, | |
4dbcdc75 | 2691 | &rdev_errors.attr, |
014236d2 | 2692 | &rdev_slot.attr, |
93c8cad0 | 2693 | &rdev_offset.attr, |
83303b61 | 2694 | &rdev_size.attr, |
06e3c817 | 2695 | &rdev_recovery_start.attr, |
86e6ffdd N |
2696 | NULL, |
2697 | }; | |
2698 | static ssize_t | |
2699 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2700 | { | |
2701 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2702 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2703 | mddev_t *mddev = rdev->mddev; |
2704 | ssize_t rv; | |
86e6ffdd N |
2705 | |
2706 | if (!entry->show) | |
2707 | return -EIO; | |
27c529bb N |
2708 | |
2709 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2710 | if (!rv) { | |
2711 | if (rdev->mddev == NULL) | |
2712 | rv = -EBUSY; | |
2713 | else | |
2714 | rv = entry->show(rdev, page); | |
2715 | mddev_unlock(mddev); | |
2716 | } | |
2717 | return rv; | |
86e6ffdd N |
2718 | } |
2719 | ||
2720 | static ssize_t | |
2721 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2722 | const char *page, size_t length) | |
2723 | { | |
2724 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2725 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2726 | ssize_t rv; |
2727 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2728 | |
2729 | if (!entry->store) | |
2730 | return -EIO; | |
67463acb N |
2731 | if (!capable(CAP_SYS_ADMIN)) |
2732 | return -EACCES; | |
27c529bb | 2733 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2734 | if (!rv) { |
27c529bb N |
2735 | if (rdev->mddev == NULL) |
2736 | rv = -EBUSY; | |
2737 | else | |
2738 | rv = entry->store(rdev, page, length); | |
6a51830e | 2739 | mddev_unlock(mddev); |
ca388059 N |
2740 | } |
2741 | return rv; | |
86e6ffdd N |
2742 | } |
2743 | ||
2744 | static void rdev_free(struct kobject *ko) | |
2745 | { | |
2746 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2747 | kfree(rdev); | |
2748 | } | |
52cf25d0 | 2749 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2750 | .show = rdev_attr_show, |
2751 | .store = rdev_attr_store, | |
2752 | }; | |
2753 | static struct kobj_type rdev_ktype = { | |
2754 | .release = rdev_free, | |
2755 | .sysfs_ops = &rdev_sysfs_ops, | |
2756 | .default_attrs = rdev_default_attrs, | |
2757 | }; | |
2758 | ||
e8bb9a83 N |
2759 | void md_rdev_init(mdk_rdev_t *rdev) |
2760 | { | |
2761 | rdev->desc_nr = -1; | |
2762 | rdev->saved_raid_disk = -1; | |
2763 | rdev->raid_disk = -1; | |
2764 | rdev->flags = 0; | |
2765 | rdev->data_offset = 0; | |
2766 | rdev->sb_events = 0; | |
2767 | rdev->last_read_error.tv_sec = 0; | |
2768 | rdev->last_read_error.tv_nsec = 0; | |
2769 | atomic_set(&rdev->nr_pending, 0); | |
2770 | atomic_set(&rdev->read_errors, 0); | |
2771 | atomic_set(&rdev->corrected_errors, 0); | |
2772 | ||
2773 | INIT_LIST_HEAD(&rdev->same_set); | |
2774 | init_waitqueue_head(&rdev->blocked_wait); | |
2775 | } | |
2776 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
2777 | /* |
2778 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2779 | * | |
2780 | * mark the device faulty if: | |
2781 | * | |
2782 | * - the device is nonexistent (zero size) | |
2783 | * - the device has no valid superblock | |
2784 | * | |
2785 | * a faulty rdev _never_ has rdev->sb set. | |
2786 | */ | |
2787 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2788 | { | |
2789 | char b[BDEVNAME_SIZE]; | |
2790 | int err; | |
2791 | mdk_rdev_t *rdev; | |
2792 | sector_t size; | |
2793 | ||
9ffae0cf | 2794 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2795 | if (!rdev) { |
2796 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2797 | return ERR_PTR(-ENOMEM); | |
2798 | } | |
1da177e4 | 2799 | |
e8bb9a83 | 2800 | md_rdev_init(rdev); |
1da177e4 LT |
2801 | if ((err = alloc_disk_sb(rdev))) |
2802 | goto abort_free; | |
2803 | ||
c5d79adb | 2804 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2805 | if (err) |
2806 | goto abort_free; | |
2807 | ||
f9cb074b | 2808 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2809 | |
77304d2a | 2810 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
2811 | if (!size) { |
2812 | printk(KERN_WARNING | |
2813 | "md: %s has zero or unknown size, marking faulty!\n", | |
2814 | bdevname(rdev->bdev,b)); | |
2815 | err = -EINVAL; | |
2816 | goto abort_free; | |
2817 | } | |
2818 | ||
2819 | if (super_format >= 0) { | |
2820 | err = super_types[super_format]. | |
2821 | load_super(rdev, NULL, super_minor); | |
2822 | if (err == -EINVAL) { | |
df968c4e N |
2823 | printk(KERN_WARNING |
2824 | "md: %s does not have a valid v%d.%d " | |
2825 | "superblock, not importing!\n", | |
2826 | bdevname(rdev->bdev,b), | |
2827 | super_format, super_minor); | |
1da177e4 LT |
2828 | goto abort_free; |
2829 | } | |
2830 | if (err < 0) { | |
2831 | printk(KERN_WARNING | |
2832 | "md: could not read %s's sb, not importing!\n", | |
2833 | bdevname(rdev->bdev,b)); | |
2834 | goto abort_free; | |
2835 | } | |
2836 | } | |
6bfe0b49 | 2837 | |
1da177e4 LT |
2838 | return rdev; |
2839 | ||
2840 | abort_free: | |
2841 | if (rdev->sb_page) { | |
2842 | if (rdev->bdev) | |
2843 | unlock_rdev(rdev); | |
2844 | free_disk_sb(rdev); | |
2845 | } | |
2846 | kfree(rdev); | |
2847 | return ERR_PTR(err); | |
2848 | } | |
2849 | ||
2850 | /* | |
2851 | * Check a full RAID array for plausibility | |
2852 | */ | |
2853 | ||
2854 | ||
a757e64c | 2855 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2856 | { |
2857 | int i; | |
159ec1fc | 2858 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2859 | char b[BDEVNAME_SIZE]; |
2860 | ||
2861 | freshest = NULL; | |
d089c6af | 2862 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2863 | switch (super_types[mddev->major_version]. |
2864 | load_super(rdev, freshest, mddev->minor_version)) { | |
2865 | case 1: | |
2866 | freshest = rdev; | |
2867 | break; | |
2868 | case 0: | |
2869 | break; | |
2870 | default: | |
2871 | printk( KERN_ERR \ | |
2872 | "md: fatal superblock inconsistency in %s" | |
2873 | " -- removing from array\n", | |
2874 | bdevname(rdev->bdev,b)); | |
2875 | kick_rdev_from_array(rdev); | |
2876 | } | |
2877 | ||
2878 | ||
2879 | super_types[mddev->major_version]. | |
2880 | validate_super(mddev, freshest); | |
2881 | ||
2882 | i = 0; | |
d089c6af | 2883 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
2884 | if (mddev->max_disks && |
2885 | (rdev->desc_nr >= mddev->max_disks || | |
2886 | i > mddev->max_disks)) { | |
de01dfad N |
2887 | printk(KERN_WARNING |
2888 | "md: %s: %s: only %d devices permitted\n", | |
2889 | mdname(mddev), bdevname(rdev->bdev, b), | |
2890 | mddev->max_disks); | |
2891 | kick_rdev_from_array(rdev); | |
2892 | continue; | |
2893 | } | |
1da177e4 LT |
2894 | if (rdev != freshest) |
2895 | if (super_types[mddev->major_version]. | |
2896 | validate_super(mddev, rdev)) { | |
2897 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2898 | " from array!\n", | |
2899 | bdevname(rdev->bdev,b)); | |
2900 | kick_rdev_from_array(rdev); | |
2901 | continue; | |
2902 | } | |
2903 | if (mddev->level == LEVEL_MULTIPATH) { | |
2904 | rdev->desc_nr = i++; | |
2905 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2906 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2907 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2908 | rdev->raid_disk = -1; |
2909 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2910 | } |
2911 | } | |
1da177e4 LT |
2912 | } |
2913 | ||
72e02075 N |
2914 | /* Read a fixed-point number. |
2915 | * Numbers in sysfs attributes should be in "standard" units where | |
2916 | * possible, so time should be in seconds. | |
2917 | * However we internally use a a much smaller unit such as | |
2918 | * milliseconds or jiffies. | |
2919 | * This function takes a decimal number with a possible fractional | |
2920 | * component, and produces an integer which is the result of | |
2921 | * multiplying that number by 10^'scale'. | |
2922 | * all without any floating-point arithmetic. | |
2923 | */ | |
2924 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2925 | { | |
2926 | unsigned long result = 0; | |
2927 | long decimals = -1; | |
2928 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
2929 | if (*cp == '.') | |
2930 | decimals = 0; | |
2931 | else if (decimals < scale) { | |
2932 | unsigned int value; | |
2933 | value = *cp - '0'; | |
2934 | result = result * 10 + value; | |
2935 | if (decimals >= 0) | |
2936 | decimals++; | |
2937 | } | |
2938 | cp++; | |
2939 | } | |
2940 | if (*cp == '\n') | |
2941 | cp++; | |
2942 | if (*cp) | |
2943 | return -EINVAL; | |
2944 | if (decimals < 0) | |
2945 | decimals = 0; | |
2946 | while (decimals < scale) { | |
2947 | result *= 10; | |
2948 | decimals ++; | |
2949 | } | |
2950 | *res = result; | |
2951 | return 0; | |
2952 | } | |
2953 | ||
2954 | ||
19052c0e N |
2955 | static void md_safemode_timeout(unsigned long data); |
2956 | ||
16f17b39 N |
2957 | static ssize_t |
2958 | safe_delay_show(mddev_t *mddev, char *page) | |
2959 | { | |
2960 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2961 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2962 | } | |
2963 | static ssize_t | |
2964 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2965 | { | |
16f17b39 | 2966 | unsigned long msec; |
97ce0a7f | 2967 | |
72e02075 | 2968 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 2969 | return -EINVAL; |
16f17b39 N |
2970 | if (msec == 0) |
2971 | mddev->safemode_delay = 0; | |
2972 | else { | |
19052c0e | 2973 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2974 | mddev->safemode_delay = (msec*HZ)/1000; |
2975 | if (mddev->safemode_delay == 0) | |
2976 | mddev->safemode_delay = 1; | |
19052c0e N |
2977 | if (mddev->safemode_delay < old_delay) |
2978 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2979 | } |
2980 | return len; | |
2981 | } | |
2982 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2983 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2984 | |
eae1701f | 2985 | static ssize_t |
96de1e66 | 2986 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2987 | { |
2604b703 | 2988 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2989 | if (p) |
eae1701f | 2990 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2991 | else if (mddev->clevel[0]) |
2992 | return sprintf(page, "%s\n", mddev->clevel); | |
2993 | else if (mddev->level != LEVEL_NONE) | |
2994 | return sprintf(page, "%d\n", mddev->level); | |
2995 | else | |
2996 | return 0; | |
eae1701f N |
2997 | } |
2998 | ||
d9d166c2 N |
2999 | static ssize_t |
3000 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
3001 | { | |
f2859af6 | 3002 | char clevel[16]; |
20a49ff6 | 3003 | ssize_t rv = len; |
245f46c2 | 3004 | struct mdk_personality *pers; |
f2859af6 | 3005 | long level; |
245f46c2 | 3006 | void *priv; |
3a981b03 | 3007 | mdk_rdev_t *rdev; |
245f46c2 N |
3008 | |
3009 | if (mddev->pers == NULL) { | |
3010 | if (len == 0) | |
3011 | return 0; | |
3012 | if (len >= sizeof(mddev->clevel)) | |
3013 | return -ENOSPC; | |
3014 | strncpy(mddev->clevel, buf, len); | |
3015 | if (mddev->clevel[len-1] == '\n') | |
3016 | len--; | |
3017 | mddev->clevel[len] = 0; | |
3018 | mddev->level = LEVEL_NONE; | |
3019 | return rv; | |
3020 | } | |
3021 | ||
3022 | /* request to change the personality. Need to ensure: | |
3023 | * - array is not engaged in resync/recovery/reshape | |
3024 | * - old personality can be suspended | |
3025 | * - new personality will access other array. | |
3026 | */ | |
3027 | ||
bb4f1e9d N |
3028 | if (mddev->sync_thread || |
3029 | mddev->reshape_position != MaxSector || | |
3030 | mddev->sysfs_active) | |
d9d166c2 | 3031 | return -EBUSY; |
245f46c2 N |
3032 | |
3033 | if (!mddev->pers->quiesce) { | |
3034 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3035 | mdname(mddev), mddev->pers->name); | |
3036 | return -EINVAL; | |
3037 | } | |
3038 | ||
3039 | /* Now find the new personality */ | |
f2859af6 | 3040 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3041 | return -EINVAL; |
f2859af6 DW |
3042 | strncpy(clevel, buf, len); |
3043 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3044 | len--; |
f2859af6 DW |
3045 | clevel[len] = 0; |
3046 | if (strict_strtol(clevel, 10, &level)) | |
3047 | level = LEVEL_NONE; | |
245f46c2 | 3048 | |
f2859af6 DW |
3049 | if (request_module("md-%s", clevel) != 0) |
3050 | request_module("md-level-%s", clevel); | |
245f46c2 | 3051 | spin_lock(&pers_lock); |
f2859af6 | 3052 | pers = find_pers(level, clevel); |
245f46c2 N |
3053 | if (!pers || !try_module_get(pers->owner)) { |
3054 | spin_unlock(&pers_lock); | |
f2859af6 | 3055 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3056 | return -EINVAL; |
3057 | } | |
3058 | spin_unlock(&pers_lock); | |
3059 | ||
3060 | if (pers == mddev->pers) { | |
3061 | /* Nothing to do! */ | |
3062 | module_put(pers->owner); | |
3063 | return rv; | |
3064 | } | |
3065 | if (!pers->takeover) { | |
3066 | module_put(pers->owner); | |
3067 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3068 | mdname(mddev), clevel); |
245f46c2 N |
3069 | return -EINVAL; |
3070 | } | |
3071 | ||
e93f68a1 N |
3072 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3073 | rdev->new_raid_disk = rdev->raid_disk; | |
3074 | ||
245f46c2 N |
3075 | /* ->takeover must set new_* and/or delta_disks |
3076 | * if it succeeds, and may set them when it fails. | |
3077 | */ | |
3078 | priv = pers->takeover(mddev); | |
3079 | if (IS_ERR(priv)) { | |
3080 | mddev->new_level = mddev->level; | |
3081 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3082 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3083 | mddev->raid_disks -= mddev->delta_disks; |
3084 | mddev->delta_disks = 0; | |
3085 | module_put(pers->owner); | |
3086 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3087 | mdname(mddev), clevel); |
245f46c2 N |
3088 | return PTR_ERR(priv); |
3089 | } | |
3090 | ||
3091 | /* Looks like we have a winner */ | |
3092 | mddev_suspend(mddev); | |
3093 | mddev->pers->stop(mddev); | |
a64c876f N |
3094 | |
3095 | if (mddev->pers->sync_request == NULL && | |
3096 | pers->sync_request != NULL) { | |
3097 | /* need to add the md_redundancy_group */ | |
3098 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3099 | printk(KERN_WARNING | |
3100 | "md: cannot register extra attributes for %s\n", | |
3101 | mdname(mddev)); | |
19fdb9ee | 3102 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3103 | } |
3104 | if (mddev->pers->sync_request != NULL && | |
3105 | pers->sync_request == NULL) { | |
3106 | /* need to remove the md_redundancy_group */ | |
3107 | if (mddev->to_remove == NULL) | |
3108 | mddev->to_remove = &md_redundancy_group; | |
3109 | } | |
3110 | ||
54071b38 TM |
3111 | if (mddev->pers->sync_request == NULL && |
3112 | mddev->external) { | |
3113 | /* We are converting from a no-redundancy array | |
3114 | * to a redundancy array and metadata is managed | |
3115 | * externally so we need to be sure that writes | |
3116 | * won't block due to a need to transition | |
3117 | * clean->dirty | |
3118 | * until external management is started. | |
3119 | */ | |
3120 | mddev->in_sync = 0; | |
3121 | mddev->safemode_delay = 0; | |
3122 | mddev->safemode = 0; | |
3123 | } | |
3124 | ||
e93f68a1 N |
3125 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
3126 | char nm[20]; | |
3127 | if (rdev->raid_disk < 0) | |
3128 | continue; | |
bf2cb0da | 3129 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3130 | rdev->new_raid_disk = -1; |
3131 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3132 | continue; | |
3133 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3134 | sysfs_remove_link(&mddev->kobj, nm); | |
3135 | } | |
3136 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3137 | if (rdev->raid_disk < 0) | |
3138 | continue; | |
3139 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3140 | continue; | |
3141 | rdev->raid_disk = rdev->new_raid_disk; | |
3142 | if (rdev->raid_disk < 0) | |
3a981b03 | 3143 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 N |
3144 | else { |
3145 | char nm[20]; | |
3146 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3147 | if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) | |
3148 | printk("md: cannot register %s for %s after level change\n", | |
3149 | nm, mdname(mddev)); | |
3a981b03 | 3150 | } |
e93f68a1 N |
3151 | } |
3152 | ||
3153 | module_put(mddev->pers->owner); | |
245f46c2 N |
3154 | mddev->pers = pers; |
3155 | mddev->private = priv; | |
3156 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3157 | mddev->level = mddev->new_level; | |
3158 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3159 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3160 | mddev->delta_disks = 0; |
9af204cf TM |
3161 | if (mddev->pers->sync_request == NULL) { |
3162 | /* this is now an array without redundancy, so | |
3163 | * it must always be in_sync | |
3164 | */ | |
3165 | mddev->in_sync = 1; | |
3166 | del_timer_sync(&mddev->safemode_timer); | |
3167 | } | |
245f46c2 N |
3168 | pers->run(mddev); |
3169 | mddev_resume(mddev); | |
3170 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3171 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3172 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3173 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3174 | md_new_event(mddev); |
d9d166c2 N |
3175 | return rv; |
3176 | } | |
3177 | ||
3178 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3179 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3180 | |
d4dbd025 N |
3181 | |
3182 | static ssize_t | |
3183 | layout_show(mddev_t *mddev, char *page) | |
3184 | { | |
3185 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3186 | if (mddev->reshape_position != MaxSector && |
3187 | mddev->layout != mddev->new_layout) | |
3188 | return sprintf(page, "%d (%d)\n", | |
3189 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3190 | return sprintf(page, "%d\n", mddev->layout); |
3191 | } | |
3192 | ||
3193 | static ssize_t | |
3194 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3195 | { | |
3196 | char *e; | |
3197 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3198 | |
3199 | if (!*buf || (*e && *e != '\n')) | |
3200 | return -EINVAL; | |
3201 | ||
b3546035 N |
3202 | if (mddev->pers) { |
3203 | int err; | |
50ac168a | 3204 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3205 | return -EBUSY; |
597a711b | 3206 | mddev->new_layout = n; |
50ac168a | 3207 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3208 | if (err) { |
3209 | mddev->new_layout = mddev->layout; | |
b3546035 | 3210 | return err; |
597a711b | 3211 | } |
b3546035 | 3212 | } else { |
08a02ecd | 3213 | mddev->new_layout = n; |
b3546035 N |
3214 | if (mddev->reshape_position == MaxSector) |
3215 | mddev->layout = n; | |
3216 | } | |
d4dbd025 N |
3217 | return len; |
3218 | } | |
3219 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3220 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3221 | |
3222 | ||
eae1701f | 3223 | static ssize_t |
96de1e66 | 3224 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3225 | { |
bb636547 N |
3226 | if (mddev->raid_disks == 0) |
3227 | return 0; | |
08a02ecd N |
3228 | if (mddev->reshape_position != MaxSector && |
3229 | mddev->delta_disks != 0) | |
3230 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3231 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3232 | return sprintf(page, "%d\n", mddev->raid_disks); |
3233 | } | |
3234 | ||
da943b99 N |
3235 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3236 | ||
3237 | static ssize_t | |
3238 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3239 | { | |
da943b99 N |
3240 | char *e; |
3241 | int rv = 0; | |
3242 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3243 | ||
3244 | if (!*buf || (*e && *e != '\n')) | |
3245 | return -EINVAL; | |
3246 | ||
3247 | if (mddev->pers) | |
3248 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3249 | else if (mddev->reshape_position != MaxSector) { |
3250 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3251 | mddev->delta_disks = n - olddisks; | |
3252 | mddev->raid_disks = n; | |
3253 | } else | |
da943b99 N |
3254 | mddev->raid_disks = n; |
3255 | return rv ? rv : len; | |
3256 | } | |
3257 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3258 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3259 | |
3b34380a N |
3260 | static ssize_t |
3261 | chunk_size_show(mddev_t *mddev, char *page) | |
3262 | { | |
08a02ecd | 3263 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3264 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3265 | return sprintf(page, "%d (%d)\n", | |
3266 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3267 | mddev->chunk_sectors << 9); |
3268 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3269 | } |
3270 | ||
3271 | static ssize_t | |
3272 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3273 | { | |
3b34380a N |
3274 | char *e; |
3275 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3276 | ||
3b34380a N |
3277 | if (!*buf || (*e && *e != '\n')) |
3278 | return -EINVAL; | |
3279 | ||
b3546035 N |
3280 | if (mddev->pers) { |
3281 | int err; | |
50ac168a | 3282 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3283 | return -EBUSY; |
597a711b | 3284 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3285 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3286 | if (err) { |
3287 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3288 | return err; |
597a711b | 3289 | } |
b3546035 | 3290 | } else { |
664e7c41 | 3291 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3292 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3293 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3294 | } |
3b34380a N |
3295 | return len; |
3296 | } | |
3297 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3298 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3299 | |
a94213b1 N |
3300 | static ssize_t |
3301 | resync_start_show(mddev_t *mddev, char *page) | |
3302 | { | |
d1a7c503 N |
3303 | if (mddev->recovery_cp == MaxSector) |
3304 | return sprintf(page, "none\n"); | |
a94213b1 N |
3305 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3306 | } | |
3307 | ||
3308 | static ssize_t | |
3309 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3310 | { | |
a94213b1 N |
3311 | char *e; |
3312 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3313 | ||
3314 | if (mddev->pers) | |
3315 | return -EBUSY; | |
06e3c817 DW |
3316 | if (cmd_match(buf, "none")) |
3317 | n = MaxSector; | |
3318 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3319 | return -EINVAL; |
3320 | ||
3321 | mddev->recovery_cp = n; | |
3322 | return len; | |
3323 | } | |
3324 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3325 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3326 | |
9e653b63 N |
3327 | /* |
3328 | * The array state can be: | |
3329 | * | |
3330 | * clear | |
3331 | * No devices, no size, no level | |
3332 | * Equivalent to STOP_ARRAY ioctl | |
3333 | * inactive | |
3334 | * May have some settings, but array is not active | |
3335 | * all IO results in error | |
3336 | * When written, doesn't tear down array, but just stops it | |
3337 | * suspended (not supported yet) | |
3338 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3339 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3340 | * readonly |
3341 | * no resync can happen. no superblocks get written. | |
3342 | * write requests fail | |
3343 | * read-auto | |
3344 | * like readonly, but behaves like 'clean' on a write request. | |
3345 | * | |
3346 | * clean - no pending writes, but otherwise active. | |
3347 | * When written to inactive array, starts without resync | |
3348 | * If a write request arrives then | |
3349 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3350 | * if not known, block and switch to write-pending | |
3351 | * If written to an active array that has pending writes, then fails. | |
3352 | * active | |
3353 | * fully active: IO and resync can be happening. | |
3354 | * When written to inactive array, starts with resync | |
3355 | * | |
3356 | * write-pending | |
3357 | * clean, but writes are blocked waiting for 'active' to be written. | |
3358 | * | |
3359 | * active-idle | |
3360 | * like active, but no writes have been seen for a while (100msec). | |
3361 | * | |
3362 | */ | |
3363 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3364 | write_pending, active_idle, bad_word}; | |
05381954 | 3365 | static char *array_states[] = { |
9e653b63 N |
3366 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3367 | "write-pending", "active-idle", NULL }; | |
3368 | ||
3369 | static int match_word(const char *word, char **list) | |
3370 | { | |
3371 | int n; | |
3372 | for (n=0; list[n]; n++) | |
3373 | if (cmd_match(word, list[n])) | |
3374 | break; | |
3375 | return n; | |
3376 | } | |
3377 | ||
3378 | static ssize_t | |
3379 | array_state_show(mddev_t *mddev, char *page) | |
3380 | { | |
3381 | enum array_state st = inactive; | |
3382 | ||
3383 | if (mddev->pers) | |
3384 | switch(mddev->ro) { | |
3385 | case 1: | |
3386 | st = readonly; | |
3387 | break; | |
3388 | case 2: | |
3389 | st = read_auto; | |
3390 | break; | |
3391 | case 0: | |
3392 | if (mddev->in_sync) | |
3393 | st = clean; | |
070dc6dd | 3394 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3395 | st = write_pending; |
9e653b63 N |
3396 | else if (mddev->safemode) |
3397 | st = active_idle; | |
3398 | else | |
3399 | st = active; | |
3400 | } | |
3401 | else { | |
3402 | if (list_empty(&mddev->disks) && | |
3403 | mddev->raid_disks == 0 && | |
58c0fed4 | 3404 | mddev->dev_sectors == 0) |
9e653b63 N |
3405 | st = clear; |
3406 | else | |
3407 | st = inactive; | |
3408 | } | |
3409 | return sprintf(page, "%s\n", array_states[st]); | |
3410 | } | |
3411 | ||
df5b20cf | 3412 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3413 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3414 | static int do_md_run(mddev_t * mddev); |
3415 | static int restart_array(mddev_t *mddev); | |
3416 | ||
3417 | static ssize_t | |
3418 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3419 | { | |
3420 | int err = -EINVAL; | |
3421 | enum array_state st = match_word(buf, array_states); | |
3422 | switch(st) { | |
3423 | case bad_word: | |
3424 | break; | |
3425 | case clear: | |
3426 | /* stopping an active array */ | |
f2ea68cf | 3427 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3428 | return -EBUSY; |
df5b20cf | 3429 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3430 | break; |
3431 | case inactive: | |
3432 | /* stopping an active array */ | |
3433 | if (mddev->pers) { | |
f2ea68cf | 3434 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3435 | return -EBUSY; |
df5b20cf | 3436 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3437 | } else |
3438 | err = 0; /* already inactive */ | |
9e653b63 N |
3439 | break; |
3440 | case suspended: | |
3441 | break; /* not supported yet */ | |
3442 | case readonly: | |
3443 | if (mddev->pers) | |
a4bd82d0 | 3444 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3445 | else { |
3446 | mddev->ro = 1; | |
648b629e | 3447 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3448 | err = do_md_run(mddev); |
3449 | } | |
3450 | break; | |
3451 | case read_auto: | |
9e653b63 | 3452 | if (mddev->pers) { |
80268ee9 | 3453 | if (mddev->ro == 0) |
a4bd82d0 | 3454 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3455 | else if (mddev->ro == 1) |
648b629e N |
3456 | err = restart_array(mddev); |
3457 | if (err == 0) { | |
3458 | mddev->ro = 2; | |
3459 | set_disk_ro(mddev->gendisk, 0); | |
3460 | } | |
9e653b63 N |
3461 | } else { |
3462 | mddev->ro = 2; | |
3463 | err = do_md_run(mddev); | |
3464 | } | |
3465 | break; | |
3466 | case clean: | |
3467 | if (mddev->pers) { | |
3468 | restart_array(mddev); | |
3469 | spin_lock_irq(&mddev->write_lock); | |
3470 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3471 | if (mddev->in_sync == 0) { |
3472 | mddev->in_sync = 1; | |
31a59e34 N |
3473 | if (mddev->safemode == 1) |
3474 | mddev->safemode = 0; | |
070dc6dd | 3475 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3476 | } |
3477 | err = 0; | |
3478 | } else | |
3479 | err = -EBUSY; | |
9e653b63 | 3480 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3481 | } else |
3482 | err = -EINVAL; | |
9e653b63 N |
3483 | break; |
3484 | case active: | |
3485 | if (mddev->pers) { | |
3486 | restart_array(mddev); | |
070dc6dd | 3487 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3488 | wake_up(&mddev->sb_wait); |
3489 | err = 0; | |
3490 | } else { | |
3491 | mddev->ro = 0; | |
648b629e | 3492 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3493 | err = do_md_run(mddev); |
3494 | } | |
3495 | break; | |
3496 | case write_pending: | |
3497 | case active_idle: | |
3498 | /* these cannot be set */ | |
3499 | break; | |
3500 | } | |
3501 | if (err) | |
3502 | return err; | |
0fd62b86 | 3503 | else { |
00bcb4ac | 3504 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3505 | return len; |
0fd62b86 | 3506 | } |
9e653b63 | 3507 | } |
80ca3a44 N |
3508 | static struct md_sysfs_entry md_array_state = |
3509 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3510 | |
1e50915f RB |
3511 | static ssize_t |
3512 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3513 | return sprintf(page, "%d\n", | |
3514 | atomic_read(&mddev->max_corr_read_errors)); | |
3515 | } | |
3516 | ||
3517 | static ssize_t | |
3518 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3519 | { | |
3520 | char *e; | |
3521 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3522 | ||
3523 | if (*buf && (*e == 0 || *e == '\n')) { | |
3524 | atomic_set(&mddev->max_corr_read_errors, n); | |
3525 | return len; | |
3526 | } | |
3527 | return -EINVAL; | |
3528 | } | |
3529 | ||
3530 | static struct md_sysfs_entry max_corr_read_errors = | |
3531 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3532 | max_corrected_read_errors_store); | |
3533 | ||
6d7ff738 N |
3534 | static ssize_t |
3535 | null_show(mddev_t *mddev, char *page) | |
3536 | { | |
3537 | return -EINVAL; | |
3538 | } | |
3539 | ||
3540 | static ssize_t | |
3541 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3542 | { | |
3543 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3544 | /* The new device is added to the array. | |
3545 | * If the array has a persistent superblock, we read the | |
3546 | * superblock to initialise info and check validity. | |
3547 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3548 | * which mainly checks size. | |
3549 | */ | |
3550 | char *e; | |
3551 | int major = simple_strtoul(buf, &e, 10); | |
3552 | int minor; | |
3553 | dev_t dev; | |
3554 | mdk_rdev_t *rdev; | |
3555 | int err; | |
3556 | ||
3557 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3558 | return -EINVAL; | |
3559 | minor = simple_strtoul(e+1, &e, 10); | |
3560 | if (*e && *e != '\n') | |
3561 | return -EINVAL; | |
3562 | dev = MKDEV(major, minor); | |
3563 | if (major != MAJOR(dev) || | |
3564 | minor != MINOR(dev)) | |
3565 | return -EOVERFLOW; | |
3566 | ||
3567 | ||
3568 | if (mddev->persistent) { | |
3569 | rdev = md_import_device(dev, mddev->major_version, | |
3570 | mddev->minor_version); | |
3571 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3572 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3573 | mdk_rdev_t, same_set); | |
3574 | err = super_types[mddev->major_version] | |
3575 | .load_super(rdev, rdev0, mddev->minor_version); | |
3576 | if (err < 0) | |
3577 | goto out; | |
3578 | } | |
c5d79adb N |
3579 | } else if (mddev->external) |
3580 | rdev = md_import_device(dev, -2, -1); | |
3581 | else | |
6d7ff738 N |
3582 | rdev = md_import_device(dev, -1, -1); |
3583 | ||
3584 | if (IS_ERR(rdev)) | |
3585 | return PTR_ERR(rdev); | |
3586 | err = bind_rdev_to_array(rdev, mddev); | |
3587 | out: | |
3588 | if (err) | |
3589 | export_rdev(rdev); | |
3590 | return err ? err : len; | |
3591 | } | |
3592 | ||
3593 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3594 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3595 | |
9b1d1dac PC |
3596 | static ssize_t |
3597 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3598 | { | |
3599 | char *end; | |
3600 | unsigned long chunk, end_chunk; | |
3601 | ||
3602 | if (!mddev->bitmap) | |
3603 | goto out; | |
3604 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3605 | while (*buf) { | |
3606 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3607 | if (buf == end) break; | |
3608 | if (*end == '-') { /* range */ | |
3609 | buf = end + 1; | |
3610 | end_chunk = simple_strtoul(buf, &end, 0); | |
3611 | if (buf == end) break; | |
3612 | } | |
3613 | if (*end && !isspace(*end)) break; | |
3614 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3615 | buf = skip_spaces(end); |
9b1d1dac PC |
3616 | } |
3617 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3618 | out: | |
3619 | return len; | |
3620 | } | |
3621 | ||
3622 | static struct md_sysfs_entry md_bitmap = | |
3623 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3624 | ||
a35b0d69 N |
3625 | static ssize_t |
3626 | size_show(mddev_t *mddev, char *page) | |
3627 | { | |
58c0fed4 AN |
3628 | return sprintf(page, "%llu\n", |
3629 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3630 | } |
3631 | ||
d71f9f88 | 3632 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3633 | |
3634 | static ssize_t | |
3635 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3636 | { | |
3637 | /* If array is inactive, we can reduce the component size, but | |
3638 | * not increase it (except from 0). | |
3639 | * If array is active, we can try an on-line resize | |
3640 | */ | |
b522adcd DW |
3641 | sector_t sectors; |
3642 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3643 | |
58c0fed4 AN |
3644 | if (err < 0) |
3645 | return err; | |
a35b0d69 | 3646 | if (mddev->pers) { |
58c0fed4 | 3647 | err = update_size(mddev, sectors); |
850b2b42 | 3648 | md_update_sb(mddev, 1); |
a35b0d69 | 3649 | } else { |
58c0fed4 AN |
3650 | if (mddev->dev_sectors == 0 || |
3651 | mddev->dev_sectors > sectors) | |
3652 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3653 | else |
3654 | err = -ENOSPC; | |
3655 | } | |
3656 | return err ? err : len; | |
3657 | } | |
3658 | ||
3659 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3660 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3661 | |
8bb93aac N |
3662 | |
3663 | /* Metdata version. | |
e691063a N |
3664 | * This is one of |
3665 | * 'none' for arrays with no metadata (good luck...) | |
3666 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3667 | * or N.M for internally known formats |
3668 | */ | |
3669 | static ssize_t | |
3670 | metadata_show(mddev_t *mddev, char *page) | |
3671 | { | |
3672 | if (mddev->persistent) | |
3673 | return sprintf(page, "%d.%d\n", | |
3674 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3675 | else if (mddev->external) |
3676 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3677 | else |
3678 | return sprintf(page, "none\n"); | |
3679 | } | |
3680 | ||
3681 | static ssize_t | |
3682 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3683 | { | |
3684 | int major, minor; | |
3685 | char *e; | |
ea43ddd8 N |
3686 | /* Changing the details of 'external' metadata is |
3687 | * always permitted. Otherwise there must be | |
3688 | * no devices attached to the array. | |
3689 | */ | |
3690 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3691 | ; | |
3692 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3693 | return -EBUSY; |
3694 | ||
3695 | if (cmd_match(buf, "none")) { | |
3696 | mddev->persistent = 0; | |
e691063a N |
3697 | mddev->external = 0; |
3698 | mddev->major_version = 0; | |
3699 | mddev->minor_version = 90; | |
3700 | return len; | |
3701 | } | |
3702 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3703 | size_t namelen = len-9; |
e691063a N |
3704 | if (namelen >= sizeof(mddev->metadata_type)) |
3705 | namelen = sizeof(mddev->metadata_type)-1; | |
3706 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3707 | mddev->metadata_type[namelen] = 0; | |
3708 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3709 | mddev->metadata_type[--namelen] = 0; | |
3710 | mddev->persistent = 0; | |
3711 | mddev->external = 1; | |
8bb93aac N |
3712 | mddev->major_version = 0; |
3713 | mddev->minor_version = 90; | |
3714 | return len; | |
3715 | } | |
3716 | major = simple_strtoul(buf, &e, 10); | |
3717 | if (e==buf || *e != '.') | |
3718 | return -EINVAL; | |
3719 | buf = e+1; | |
3720 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3721 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3722 | return -EINVAL; |
50511da3 | 3723 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3724 | return -ENOENT; |
3725 | mddev->major_version = major; | |
3726 | mddev->minor_version = minor; | |
3727 | mddev->persistent = 1; | |
e691063a | 3728 | mddev->external = 0; |
8bb93aac N |
3729 | return len; |
3730 | } | |
3731 | ||
3732 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3733 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3734 | |
24dd469d | 3735 | static ssize_t |
7eec314d | 3736 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3737 | { |
7eec314d | 3738 | char *type = "idle"; |
b6a9ce68 N |
3739 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3740 | type = "frozen"; | |
3741 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3742 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3743 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3744 | type = "reshape"; | |
3745 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3746 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3747 | type = "resync"; | |
3748 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3749 | type = "check"; | |
3750 | else | |
3751 | type = "repair"; | |
72a23c21 | 3752 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3753 | type = "recover"; |
3754 | } | |
3755 | return sprintf(page, "%s\n", type); | |
3756 | } | |
3757 | ||
7ebc0be7 N |
3758 | static void reap_sync_thread(mddev_t *mddev); |
3759 | ||
24dd469d | 3760 | static ssize_t |
7eec314d | 3761 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3762 | { |
7eec314d N |
3763 | if (!mddev->pers || !mddev->pers->sync_request) |
3764 | return -EINVAL; | |
3765 | ||
b6a9ce68 N |
3766 | if (cmd_match(page, "frozen")) |
3767 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3768 | else | |
3769 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3770 | ||
3771 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3772 | if (mddev->sync_thread) { |
3773 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 3774 | reap_sync_thread(mddev); |
7eec314d | 3775 | } |
03c902e1 N |
3776 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3777 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3778 | return -EBUSY; |
72a23c21 NB |
3779 | else if (cmd_match(page, "resync")) |
3780 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3781 | else if (cmd_match(page, "recover")) { | |
3782 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3783 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3784 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3785 | int err; |
3786 | if (mddev->pers->start_reshape == NULL) | |
3787 | return -EINVAL; | |
3788 | err = mddev->pers->start_reshape(mddev); | |
3789 | if (err) | |
3790 | return err; | |
a99ac971 | 3791 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3792 | } else { |
bce74dac | 3793 | if (cmd_match(page, "check")) |
7eec314d | 3794 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3795 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3796 | return -EINVAL; |
3797 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3798 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3799 | } |
03c902e1 | 3800 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3801 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 3802 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
3803 | return len; |
3804 | } | |
3805 | ||
9d88883e | 3806 | static ssize_t |
96de1e66 | 3807 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3808 | { |
3809 | return sprintf(page, "%llu\n", | |
3810 | (unsigned long long) mddev->resync_mismatches); | |
3811 | } | |
3812 | ||
80ca3a44 N |
3813 | static struct md_sysfs_entry md_scan_mode = |
3814 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3815 | |
96de1e66 | 3816 | |
80ca3a44 | 3817 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3818 | |
88202a0c N |
3819 | static ssize_t |
3820 | sync_min_show(mddev_t *mddev, char *page) | |
3821 | { | |
3822 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3823 | mddev->sync_speed_min ? "local": "system"); | |
3824 | } | |
3825 | ||
3826 | static ssize_t | |
3827 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3828 | { | |
3829 | int min; | |
3830 | char *e; | |
3831 | if (strncmp(buf, "system", 6)==0) { | |
3832 | mddev->sync_speed_min = 0; | |
3833 | return len; | |
3834 | } | |
3835 | min = simple_strtoul(buf, &e, 10); | |
3836 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3837 | return -EINVAL; | |
3838 | mddev->sync_speed_min = min; | |
3839 | return len; | |
3840 | } | |
3841 | ||
3842 | static struct md_sysfs_entry md_sync_min = | |
3843 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3844 | ||
3845 | static ssize_t | |
3846 | sync_max_show(mddev_t *mddev, char *page) | |
3847 | { | |
3848 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3849 | mddev->sync_speed_max ? "local": "system"); | |
3850 | } | |
3851 | ||
3852 | static ssize_t | |
3853 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3854 | { | |
3855 | int max; | |
3856 | char *e; | |
3857 | if (strncmp(buf, "system", 6)==0) { | |
3858 | mddev->sync_speed_max = 0; | |
3859 | return len; | |
3860 | } | |
3861 | max = simple_strtoul(buf, &e, 10); | |
3862 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3863 | return -EINVAL; | |
3864 | mddev->sync_speed_max = max; | |
3865 | return len; | |
3866 | } | |
3867 | ||
3868 | static struct md_sysfs_entry md_sync_max = | |
3869 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3870 | ||
d7f3d291 IP |
3871 | static ssize_t |
3872 | degraded_show(mddev_t *mddev, char *page) | |
3873 | { | |
3874 | return sprintf(page, "%d\n", mddev->degraded); | |
3875 | } | |
3876 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3877 | |
90b08710 BS |
3878 | static ssize_t |
3879 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3880 | { | |
3881 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3882 | } | |
3883 | ||
3884 | static ssize_t | |
3885 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3886 | { | |
3887 | long n; | |
3888 | ||
3889 | if (strict_strtol(buf, 10, &n)) | |
3890 | return -EINVAL; | |
3891 | ||
3892 | if (n != 0 && n != 1) | |
3893 | return -EINVAL; | |
3894 | ||
3895 | mddev->parallel_resync = n; | |
3896 | ||
3897 | if (mddev->sync_thread) | |
3898 | wake_up(&resync_wait); | |
3899 | ||
3900 | return len; | |
3901 | } | |
3902 | ||
3903 | /* force parallel resync, even with shared block devices */ | |
3904 | static struct md_sysfs_entry md_sync_force_parallel = | |
3905 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3906 | sync_force_parallel_show, sync_force_parallel_store); | |
3907 | ||
88202a0c N |
3908 | static ssize_t |
3909 | sync_speed_show(mddev_t *mddev, char *page) | |
3910 | { | |
3911 | unsigned long resync, dt, db; | |
d1a7c503 N |
3912 | if (mddev->curr_resync == 0) |
3913 | return sprintf(page, "none\n"); | |
9687a60c AN |
3914 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3915 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3916 | if (!dt) dt++; |
9687a60c AN |
3917 | db = resync - mddev->resync_mark_cnt; |
3918 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3919 | } |
3920 | ||
80ca3a44 | 3921 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3922 | |
3923 | static ssize_t | |
3924 | sync_completed_show(mddev_t *mddev, char *page) | |
3925 | { | |
13ae864b | 3926 | unsigned long long max_sectors, resync; |
88202a0c | 3927 | |
acb180b0 N |
3928 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3929 | return sprintf(page, "none\n"); | |
3930 | ||
88202a0c | 3931 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3932 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3933 | else |
58c0fed4 | 3934 | max_sectors = mddev->dev_sectors; |
88202a0c | 3935 | |
acb180b0 | 3936 | resync = mddev->curr_resync_completed; |
13ae864b | 3937 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
3938 | } |
3939 | ||
80ca3a44 | 3940 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3941 | |
5e96ee65 NB |
3942 | static ssize_t |
3943 | min_sync_show(mddev_t *mddev, char *page) | |
3944 | { | |
3945 | return sprintf(page, "%llu\n", | |
3946 | (unsigned long long)mddev->resync_min); | |
3947 | } | |
3948 | static ssize_t | |
3949 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3950 | { | |
3951 | unsigned long long min; | |
3952 | if (strict_strtoull(buf, 10, &min)) | |
3953 | return -EINVAL; | |
3954 | if (min > mddev->resync_max) | |
3955 | return -EINVAL; | |
3956 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3957 | return -EBUSY; | |
3958 | ||
3959 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3960 | if (mddev->chunk_sectors) { |
2ac06c33 | 3961 | sector_t temp = min; |
9d8f0363 | 3962 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
3963 | return -EINVAL; |
3964 | } | |
3965 | mddev->resync_min = min; | |
3966 | ||
3967 | return len; | |
3968 | } | |
3969 | ||
3970 | static struct md_sysfs_entry md_min_sync = | |
3971 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3972 | ||
c6207277 N |
3973 | static ssize_t |
3974 | max_sync_show(mddev_t *mddev, char *page) | |
3975 | { | |
3976 | if (mddev->resync_max == MaxSector) | |
3977 | return sprintf(page, "max\n"); | |
3978 | else | |
3979 | return sprintf(page, "%llu\n", | |
3980 | (unsigned long long)mddev->resync_max); | |
3981 | } | |
3982 | static ssize_t | |
3983 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3984 | { | |
3985 | if (strncmp(buf, "max", 3) == 0) | |
3986 | mddev->resync_max = MaxSector; | |
3987 | else { | |
5e96ee65 NB |
3988 | unsigned long long max; |
3989 | if (strict_strtoull(buf, 10, &max)) | |
3990 | return -EINVAL; | |
3991 | if (max < mddev->resync_min) | |
c6207277 N |
3992 | return -EINVAL; |
3993 | if (max < mddev->resync_max && | |
4d484a4a | 3994 | mddev->ro == 0 && |
c6207277 N |
3995 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3996 | return -EBUSY; | |
3997 | ||
3998 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3999 | if (mddev->chunk_sectors) { |
2ac06c33 | 4000 | sector_t temp = max; |
9d8f0363 | 4001 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4002 | return -EINVAL; |
4003 | } | |
4004 | mddev->resync_max = max; | |
4005 | } | |
4006 | wake_up(&mddev->recovery_wait); | |
4007 | return len; | |
4008 | } | |
4009 | ||
4010 | static struct md_sysfs_entry md_max_sync = | |
4011 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4012 | ||
e464eafd N |
4013 | static ssize_t |
4014 | suspend_lo_show(mddev_t *mddev, char *page) | |
4015 | { | |
4016 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4017 | } | |
4018 | ||
4019 | static ssize_t | |
4020 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
4021 | { | |
4022 | char *e; | |
4023 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4024 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4025 | |
b8d966ef N |
4026 | if (mddev->pers == NULL || |
4027 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4028 | return -EINVAL; |
4029 | if (buf == e || (*e && *e != '\n')) | |
4030 | return -EINVAL; | |
23ddff37 N |
4031 | |
4032 | mddev->suspend_lo = new; | |
4033 | if (new >= old) | |
4034 | /* Shrinking suspended region */ | |
e464eafd | 4035 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4036 | else { |
4037 | /* Expanding suspended region - need to wait */ | |
4038 | mddev->pers->quiesce(mddev, 1); | |
4039 | mddev->pers->quiesce(mddev, 0); | |
4040 | } | |
4041 | return len; | |
e464eafd N |
4042 | } |
4043 | static struct md_sysfs_entry md_suspend_lo = | |
4044 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4045 | ||
4046 | ||
4047 | static ssize_t | |
4048 | suspend_hi_show(mddev_t *mddev, char *page) | |
4049 | { | |
4050 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4051 | } | |
4052 | ||
4053 | static ssize_t | |
4054 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
4055 | { | |
4056 | char *e; | |
4057 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4058 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4059 | |
b8d966ef N |
4060 | if (mddev->pers == NULL || |
4061 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4062 | return -EINVAL; |
4063 | if (buf == e || (*e && *e != '\n')) | |
4064 | return -EINVAL; | |
23ddff37 N |
4065 | |
4066 | mddev->suspend_hi = new; | |
4067 | if (new <= old) | |
4068 | /* Shrinking suspended region */ | |
4069 | mddev->pers->quiesce(mddev, 2); | |
4070 | else { | |
4071 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4072 | mddev->pers->quiesce(mddev, 1); |
4073 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4074 | } |
4075 | return len; | |
e464eafd N |
4076 | } |
4077 | static struct md_sysfs_entry md_suspend_hi = | |
4078 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4079 | ||
08a02ecd N |
4080 | static ssize_t |
4081 | reshape_position_show(mddev_t *mddev, char *page) | |
4082 | { | |
4083 | if (mddev->reshape_position != MaxSector) | |
4084 | return sprintf(page, "%llu\n", | |
4085 | (unsigned long long)mddev->reshape_position); | |
4086 | strcpy(page, "none\n"); | |
4087 | return 5; | |
4088 | } | |
4089 | ||
4090 | static ssize_t | |
4091 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4092 | { | |
4093 | char *e; | |
4094 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4095 | if (mddev->pers) | |
4096 | return -EBUSY; | |
4097 | if (buf == e || (*e && *e != '\n')) | |
4098 | return -EINVAL; | |
4099 | mddev->reshape_position = new; | |
4100 | mddev->delta_disks = 0; | |
4101 | mddev->new_level = mddev->level; | |
4102 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4103 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4104 | return len; |
4105 | } | |
4106 | ||
4107 | static struct md_sysfs_entry md_reshape_position = | |
4108 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4109 | reshape_position_store); | |
4110 | ||
b522adcd DW |
4111 | static ssize_t |
4112 | array_size_show(mddev_t *mddev, char *page) | |
4113 | { | |
4114 | if (mddev->external_size) | |
4115 | return sprintf(page, "%llu\n", | |
4116 | (unsigned long long)mddev->array_sectors/2); | |
4117 | else | |
4118 | return sprintf(page, "default\n"); | |
4119 | } | |
4120 | ||
4121 | static ssize_t | |
4122 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4123 | { | |
4124 | sector_t sectors; | |
4125 | ||
4126 | if (strncmp(buf, "default", 7) == 0) { | |
4127 | if (mddev->pers) | |
4128 | sectors = mddev->pers->size(mddev, 0, 0); | |
4129 | else | |
4130 | sectors = mddev->array_sectors; | |
4131 | ||
4132 | mddev->external_size = 0; | |
4133 | } else { | |
4134 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4135 | return -EINVAL; | |
4136 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4137 | return -E2BIG; |
b522adcd DW |
4138 | |
4139 | mddev->external_size = 1; | |
4140 | } | |
4141 | ||
4142 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4143 | if (mddev->pers) { |
4144 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4145 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4146 | } |
b522adcd DW |
4147 | return len; |
4148 | } | |
4149 | ||
4150 | static struct md_sysfs_entry md_array_size = | |
4151 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4152 | array_size_store); | |
e464eafd | 4153 | |
eae1701f N |
4154 | static struct attribute *md_default_attrs[] = { |
4155 | &md_level.attr, | |
d4dbd025 | 4156 | &md_layout.attr, |
eae1701f | 4157 | &md_raid_disks.attr, |
3b34380a | 4158 | &md_chunk_size.attr, |
a35b0d69 | 4159 | &md_size.attr, |
a94213b1 | 4160 | &md_resync_start.attr, |
8bb93aac | 4161 | &md_metadata.attr, |
6d7ff738 | 4162 | &md_new_device.attr, |
16f17b39 | 4163 | &md_safe_delay.attr, |
9e653b63 | 4164 | &md_array_state.attr, |
08a02ecd | 4165 | &md_reshape_position.attr, |
b522adcd | 4166 | &md_array_size.attr, |
1e50915f | 4167 | &max_corr_read_errors.attr, |
411036fa N |
4168 | NULL, |
4169 | }; | |
4170 | ||
4171 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4172 | &md_scan_mode.attr, |
9d88883e | 4173 | &md_mismatches.attr, |
88202a0c N |
4174 | &md_sync_min.attr, |
4175 | &md_sync_max.attr, | |
4176 | &md_sync_speed.attr, | |
90b08710 | 4177 | &md_sync_force_parallel.attr, |
88202a0c | 4178 | &md_sync_completed.attr, |
5e96ee65 | 4179 | &md_min_sync.attr, |
c6207277 | 4180 | &md_max_sync.attr, |
e464eafd N |
4181 | &md_suspend_lo.attr, |
4182 | &md_suspend_hi.attr, | |
9b1d1dac | 4183 | &md_bitmap.attr, |
d7f3d291 | 4184 | &md_degraded.attr, |
eae1701f N |
4185 | NULL, |
4186 | }; | |
411036fa N |
4187 | static struct attribute_group md_redundancy_group = { |
4188 | .name = NULL, | |
4189 | .attrs = md_redundancy_attrs, | |
4190 | }; | |
4191 | ||
eae1701f N |
4192 | |
4193 | static ssize_t | |
4194 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4195 | { | |
4196 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4197 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4198 | ssize_t rv; |
eae1701f N |
4199 | |
4200 | if (!entry->show) | |
4201 | return -EIO; | |
5dc5cf7d IM |
4202 | rv = mddev_lock(mddev); |
4203 | if (!rv) { | |
4204 | rv = entry->show(mddev, page); | |
4205 | mddev_unlock(mddev); | |
4206 | } | |
96de1e66 | 4207 | return rv; |
eae1701f N |
4208 | } |
4209 | ||
4210 | static ssize_t | |
4211 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4212 | const char *page, size_t length) | |
4213 | { | |
4214 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4215 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4216 | ssize_t rv; |
eae1701f N |
4217 | |
4218 | if (!entry->store) | |
4219 | return -EIO; | |
67463acb N |
4220 | if (!capable(CAP_SYS_ADMIN)) |
4221 | return -EACCES; | |
5dc5cf7d | 4222 | rv = mddev_lock(mddev); |
d3374825 N |
4223 | if (mddev->hold_active == UNTIL_IOCTL) |
4224 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4225 | if (!rv) { |
4226 | rv = entry->store(mddev, page, length); | |
4227 | mddev_unlock(mddev); | |
4228 | } | |
96de1e66 | 4229 | return rv; |
eae1701f N |
4230 | } |
4231 | ||
4232 | static void md_free(struct kobject *ko) | |
4233 | { | |
4234 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4235 | |
4236 | if (mddev->sysfs_state) | |
4237 | sysfs_put(mddev->sysfs_state); | |
4238 | ||
4239 | if (mddev->gendisk) { | |
4240 | del_gendisk(mddev->gendisk); | |
4241 | put_disk(mddev->gendisk); | |
4242 | } | |
4243 | if (mddev->queue) | |
4244 | blk_cleanup_queue(mddev->queue); | |
4245 | ||
eae1701f N |
4246 | kfree(mddev); |
4247 | } | |
4248 | ||
52cf25d0 | 4249 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4250 | .show = md_attr_show, |
4251 | .store = md_attr_store, | |
4252 | }; | |
4253 | static struct kobj_type md_ktype = { | |
4254 | .release = md_free, | |
4255 | .sysfs_ops = &md_sysfs_ops, | |
4256 | .default_attrs = md_default_attrs, | |
4257 | }; | |
4258 | ||
1da177e4 LT |
4259 | int mdp_major = 0; |
4260 | ||
5fd3a17e DW |
4261 | static void mddev_delayed_delete(struct work_struct *ws) |
4262 | { | |
4263 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4264 | ||
43a70507 | 4265 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4266 | kobject_del(&mddev->kobj); |
4267 | kobject_put(&mddev->kobj); | |
4268 | } | |
4269 | ||
efeb53c0 | 4270 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4271 | { |
48c9c27b | 4272 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4273 | mddev_t *mddev = mddev_find(dev); |
4274 | struct gendisk *disk; | |
efeb53c0 N |
4275 | int partitioned; |
4276 | int shift; | |
4277 | int unit; | |
3830c62f | 4278 | int error; |
1da177e4 LT |
4279 | |
4280 | if (!mddev) | |
efeb53c0 N |
4281 | return -ENODEV; |
4282 | ||
4283 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4284 | shift = partitioned ? MdpMinorShift : 0; | |
4285 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4286 | |
e804ac78 TH |
4287 | /* wait for any previous instance of this device to be |
4288 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4289 | */ |
e804ac78 | 4290 | flush_workqueue(md_misc_wq); |
d3374825 | 4291 | |
48c9c27b | 4292 | mutex_lock(&disks_mutex); |
0909dc44 N |
4293 | error = -EEXIST; |
4294 | if (mddev->gendisk) | |
4295 | goto abort; | |
efeb53c0 N |
4296 | |
4297 | if (name) { | |
4298 | /* Need to ensure that 'name' is not a duplicate. | |
4299 | */ | |
4300 | mddev_t *mddev2; | |
4301 | spin_lock(&all_mddevs_lock); | |
4302 | ||
4303 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4304 | if (mddev2->gendisk && | |
4305 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4306 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4307 | goto abort; |
efeb53c0 N |
4308 | } |
4309 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4310 | } |
8b765398 | 4311 | |
0909dc44 | 4312 | error = -ENOMEM; |
8b765398 | 4313 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4314 | if (!mddev->queue) |
4315 | goto abort; | |
409c57f3 N |
4316 | mddev->queue->queuedata = mddev; |
4317 | ||
409c57f3 | 4318 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4319 | |
1da177e4 LT |
4320 | disk = alloc_disk(1 << shift); |
4321 | if (!disk) { | |
8b765398 N |
4322 | blk_cleanup_queue(mddev->queue); |
4323 | mddev->queue = NULL; | |
0909dc44 | 4324 | goto abort; |
1da177e4 | 4325 | } |
efeb53c0 | 4326 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4327 | disk->first_minor = unit << shift; |
efeb53c0 N |
4328 | if (name) |
4329 | strcpy(disk->disk_name, name); | |
4330 | else if (partitioned) | |
1da177e4 | 4331 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4332 | else |
1da177e4 | 4333 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4334 | disk->fops = &md_fops; |
4335 | disk->private_data = mddev; | |
4336 | disk->queue = mddev->queue; | |
92850bbd | 4337 | /* Allow extended partitions. This makes the |
d3374825 | 4338 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4339 | * remove it now. |
4340 | */ | |
4341 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
4342 | add_disk(disk); |
4343 | mddev->gendisk = disk; | |
ed9e1982 TH |
4344 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4345 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4346 | if (error) { |
4347 | /* This isn't possible, but as kobject_init_and_add is marked | |
4348 | * __must_check, we must do something with the result | |
4349 | */ | |
5e55e2f5 N |
4350 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4351 | disk->disk_name); | |
0909dc44 N |
4352 | error = 0; |
4353 | } | |
00bcb4ac N |
4354 | if (mddev->kobj.sd && |
4355 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4356 | printk(KERN_DEBUG "pointless warning\n"); |
be20e6c6 DW |
4357 | |
4358 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); | |
0909dc44 N |
4359 | abort: |
4360 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4361 | if (!error && mddev->kobj.sd) { |
3830c62f | 4362 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4363 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4364 | } |
d3374825 | 4365 | mddev_put(mddev); |
0909dc44 | 4366 | return error; |
efeb53c0 N |
4367 | } |
4368 | ||
4369 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4370 | { | |
4371 | md_alloc(dev, NULL); | |
1da177e4 LT |
4372 | return NULL; |
4373 | } | |
4374 | ||
efeb53c0 N |
4375 | static int add_named_array(const char *val, struct kernel_param *kp) |
4376 | { | |
4377 | /* val must be "md_*" where * is not all digits. | |
4378 | * We allocate an array with a large free minor number, and | |
4379 | * set the name to val. val must not already be an active name. | |
4380 | */ | |
4381 | int len = strlen(val); | |
4382 | char buf[DISK_NAME_LEN]; | |
4383 | ||
4384 | while (len && val[len-1] == '\n') | |
4385 | len--; | |
4386 | if (len >= DISK_NAME_LEN) | |
4387 | return -E2BIG; | |
4388 | strlcpy(buf, val, len+1); | |
4389 | if (strncmp(buf, "md_", 3) != 0) | |
4390 | return -EINVAL; | |
4391 | return md_alloc(0, buf); | |
4392 | } | |
4393 | ||
1da177e4 LT |
4394 | static void md_safemode_timeout(unsigned long data) |
4395 | { | |
4396 | mddev_t *mddev = (mddev_t *) data; | |
4397 | ||
0fd62b86 NB |
4398 | if (!atomic_read(&mddev->writes_pending)) { |
4399 | mddev->safemode = 1; | |
4400 | if (mddev->external) | |
00bcb4ac | 4401 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4402 | } |
1da177e4 LT |
4403 | md_wakeup_thread(mddev->thread); |
4404 | } | |
4405 | ||
6ff8d8ec | 4406 | static int start_dirty_degraded; |
1da177e4 | 4407 | |
390ee602 | 4408 | int md_run(mddev_t *mddev) |
1da177e4 | 4409 | { |
2604b703 | 4410 | int err; |
1da177e4 | 4411 | mdk_rdev_t *rdev; |
2604b703 | 4412 | struct mdk_personality *pers; |
1da177e4 | 4413 | |
a757e64c N |
4414 | if (list_empty(&mddev->disks)) |
4415 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4416 | return -EINVAL; |
1da177e4 LT |
4417 | |
4418 | if (mddev->pers) | |
4419 | return -EBUSY; | |
bb4f1e9d N |
4420 | /* Cannot run until previous stop completes properly */ |
4421 | if (mddev->sysfs_active) | |
4422 | return -EBUSY; | |
b6eb127d | 4423 | |
1da177e4 LT |
4424 | /* |
4425 | * Analyze all RAID superblock(s) | |
4426 | */ | |
1ec4a939 N |
4427 | if (!mddev->raid_disks) { |
4428 | if (!mddev->persistent) | |
4429 | return -EINVAL; | |
a757e64c | 4430 | analyze_sbs(mddev); |
1ec4a939 | 4431 | } |
1da177e4 | 4432 | |
d9d166c2 N |
4433 | if (mddev->level != LEVEL_NONE) |
4434 | request_module("md-level-%d", mddev->level); | |
4435 | else if (mddev->clevel[0]) | |
4436 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4437 | |
4438 | /* | |
4439 | * Drop all container device buffers, from now on | |
4440 | * the only valid external interface is through the md | |
4441 | * device. | |
1da177e4 | 4442 | */ |
159ec1fc | 4443 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4444 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4445 | continue; |
4446 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4447 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4448 | |
4449 | /* perform some consistency tests on the device. | |
4450 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4451 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4452 | */ |
a6ff7e08 JB |
4453 | if (rdev->meta_bdev) { |
4454 | /* Nothing to check */; | |
4455 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4456 | if (mddev->dev_sectors && |
4457 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4458 | > rdev->sb_start) { |
f0d76d70 N |
4459 | printk("md: %s: data overlaps metadata\n", |
4460 | mdname(mddev)); | |
4461 | return -EINVAL; | |
4462 | } | |
4463 | } else { | |
0f420358 | 4464 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4465 | > rdev->data_offset) { |
4466 | printk("md: %s: metadata overlaps data\n", | |
4467 | mdname(mddev)); | |
4468 | return -EINVAL; | |
4469 | } | |
4470 | } | |
00bcb4ac | 4471 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4472 | } |
4473 | ||
a167f663 N |
4474 | if (mddev->bio_set == NULL) |
4475 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, sizeof(mddev)); | |
4476 | ||
1da177e4 | 4477 | spin_lock(&pers_lock); |
d9d166c2 | 4478 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4479 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4480 | spin_unlock(&pers_lock); |
d9d166c2 N |
4481 | if (mddev->level != LEVEL_NONE) |
4482 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4483 | mddev->level); | |
4484 | else | |
4485 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4486 | mddev->clevel); | |
1da177e4 LT |
4487 | return -EINVAL; |
4488 | } | |
2604b703 | 4489 | mddev->pers = pers; |
1da177e4 | 4490 | spin_unlock(&pers_lock); |
34817e8c N |
4491 | if (mddev->level != pers->level) { |
4492 | mddev->level = pers->level; | |
4493 | mddev->new_level = pers->level; | |
4494 | } | |
d9d166c2 | 4495 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4496 | |
f6705578 | 4497 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4498 | pers->start_reshape == NULL) { |
f6705578 N |
4499 | /* This personality cannot handle reshaping... */ |
4500 | mddev->pers = NULL; | |
4501 | module_put(pers->owner); | |
4502 | return -EINVAL; | |
4503 | } | |
4504 | ||
7dd5e7c3 N |
4505 | if (pers->sync_request) { |
4506 | /* Warn if this is a potentially silly | |
4507 | * configuration. | |
4508 | */ | |
4509 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4510 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4511 | int warned = 0; |
159ec1fc CR |
4512 | |
4513 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4514 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4515 | if (rdev < rdev2 && |
4516 | rdev->bdev->bd_contains == | |
4517 | rdev2->bdev->bd_contains) { | |
4518 | printk(KERN_WARNING | |
4519 | "%s: WARNING: %s appears to be" | |
4520 | " on the same physical disk as" | |
4521 | " %s.\n", | |
4522 | mdname(mddev), | |
4523 | bdevname(rdev->bdev,b), | |
4524 | bdevname(rdev2->bdev,b2)); | |
4525 | warned = 1; | |
4526 | } | |
4527 | } | |
159ec1fc | 4528 | |
7dd5e7c3 N |
4529 | if (warned) |
4530 | printk(KERN_WARNING | |
4531 | "True protection against single-disk" | |
4532 | " failure might be compromised.\n"); | |
4533 | } | |
4534 | ||
657390d2 | 4535 | mddev->recovery = 0; |
58c0fed4 AN |
4536 | /* may be over-ridden by personality */ |
4537 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4538 | ||
6ff8d8ec | 4539 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4540 | |
0f9552b5 | 4541 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4542 | mddev->ro = 2; /* read-only, but switch on first write */ |
4543 | ||
b15c2e57 | 4544 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4545 | if (err) |
4546 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4547 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4548 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4549 | " but 'external_size' not in effect?\n", __func__); | |
4550 | printk(KERN_ERR | |
4551 | "md: invalid array_size %llu > default size %llu\n", | |
4552 | (unsigned long long)mddev->array_sectors / 2, | |
4553 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4554 | err = -EINVAL; | |
4555 | mddev->pers->stop(mddev); | |
4556 | } | |
4557 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4558 | err = bitmap_create(mddev); |
4559 | if (err) { | |
4560 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4561 | mdname(mddev), err); | |
4562 | mddev->pers->stop(mddev); | |
4563 | } | |
4564 | } | |
1da177e4 | 4565 | if (err) { |
1da177e4 LT |
4566 | module_put(mddev->pers->owner); |
4567 | mddev->pers = NULL; | |
32a7627c N |
4568 | bitmap_destroy(mddev); |
4569 | return err; | |
1da177e4 | 4570 | } |
5e55e2f5 | 4571 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4572 | if (mddev->kobj.sd && |
4573 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4574 | printk(KERN_WARNING |
4575 | "md: cannot register extra attributes for %s\n", | |
4576 | mdname(mddev)); | |
00bcb4ac | 4577 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4578 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4579 | mddev->ro = 0; |
4580 | ||
1da177e4 | 4581 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4582 | atomic_set(&mddev->max_corr_read_errors, |
4583 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4584 | mddev->safemode = 0; |
4585 | mddev->safemode_timer.function = md_safemode_timeout; | |
4586 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4587 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4588 | mddev->in_sync = 1; |
0ca69886 N |
4589 | smp_wmb(); |
4590 | mddev->ready = 1; | |
159ec1fc | 4591 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4592 | if (rdev->raid_disk >= 0) { |
4593 | char nm[20]; | |
4594 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 | 4595 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
00bcb4ac | 4596 | /* failure here is OK */; |
86e6ffdd | 4597 | } |
1da177e4 LT |
4598 | |
4599 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4600 | ||
850b2b42 N |
4601 | if (mddev->flags) |
4602 | md_update_sb(mddev, 0); | |
1da177e4 | 4603 | |
0b8c9de0 N |
4604 | md_wakeup_thread(mddev->thread); |
4605 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4606 | |
d7603b7e | 4607 | md_new_event(mddev); |
00bcb4ac N |
4608 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4609 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4610 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4611 | return 0; |
4612 | } | |
390ee602 | 4613 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4614 | |
fe60b014 N |
4615 | static int do_md_run(mddev_t *mddev) |
4616 | { | |
4617 | int err; | |
4618 | ||
4619 | err = md_run(mddev); | |
4620 | if (err) | |
4621 | goto out; | |
69e51b44 N |
4622 | err = bitmap_load(mddev); |
4623 | if (err) { | |
4624 | bitmap_destroy(mddev); | |
4625 | goto out; | |
4626 | } | |
fe60b014 N |
4627 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4628 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 4629 | mddev->changed = 1; |
fe60b014 N |
4630 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
4631 | out: | |
4632 | return err; | |
4633 | } | |
4634 | ||
1da177e4 LT |
4635 | static int restart_array(mddev_t *mddev) |
4636 | { | |
4637 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4638 | |
80fab1d7 | 4639 | /* Complain if it has no devices */ |
1da177e4 | 4640 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4641 | return -ENXIO; |
4642 | if (!mddev->pers) | |
4643 | return -EINVAL; | |
4644 | if (!mddev->ro) | |
4645 | return -EBUSY; | |
4646 | mddev->safemode = 0; | |
4647 | mddev->ro = 0; | |
4648 | set_disk_ro(disk, 0); | |
4649 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4650 | mdname(mddev)); | |
4651 | /* Kick recovery or resync if necessary */ | |
4652 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4653 | md_wakeup_thread(mddev->thread); | |
4654 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4655 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4656 | return 0; |
1da177e4 LT |
4657 | } |
4658 | ||
acc55e22 N |
4659 | /* similar to deny_write_access, but accounts for our holding a reference |
4660 | * to the file ourselves */ | |
4661 | static int deny_bitmap_write_access(struct file * file) | |
4662 | { | |
4663 | struct inode *inode = file->f_mapping->host; | |
4664 | ||
4665 | spin_lock(&inode->i_lock); | |
4666 | if (atomic_read(&inode->i_writecount) > 1) { | |
4667 | spin_unlock(&inode->i_lock); | |
4668 | return -ETXTBSY; | |
4669 | } | |
4670 | atomic_set(&inode->i_writecount, -1); | |
4671 | spin_unlock(&inode->i_lock); | |
4672 | ||
4673 | return 0; | |
4674 | } | |
4675 | ||
43a70507 | 4676 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4677 | { |
4678 | struct inode *inode = file->f_mapping->host; | |
4679 | ||
4680 | spin_lock(&inode->i_lock); | |
4681 | atomic_set(&inode->i_writecount, 1); | |
4682 | spin_unlock(&inode->i_lock); | |
4683 | } | |
4684 | ||
6177b472 N |
4685 | static void md_clean(mddev_t *mddev) |
4686 | { | |
4687 | mddev->array_sectors = 0; | |
4688 | mddev->external_size = 0; | |
4689 | mddev->dev_sectors = 0; | |
4690 | mddev->raid_disks = 0; | |
4691 | mddev->recovery_cp = 0; | |
4692 | mddev->resync_min = 0; | |
4693 | mddev->resync_max = MaxSector; | |
4694 | mddev->reshape_position = MaxSector; | |
4695 | mddev->external = 0; | |
4696 | mddev->persistent = 0; | |
4697 | mddev->level = LEVEL_NONE; | |
4698 | mddev->clevel[0] = 0; | |
4699 | mddev->flags = 0; | |
4700 | mddev->ro = 0; | |
4701 | mddev->metadata_type[0] = 0; | |
4702 | mddev->chunk_sectors = 0; | |
4703 | mddev->ctime = mddev->utime = 0; | |
4704 | mddev->layout = 0; | |
4705 | mddev->max_disks = 0; | |
4706 | mddev->events = 0; | |
a8707c08 | 4707 | mddev->can_decrease_events = 0; |
6177b472 N |
4708 | mddev->delta_disks = 0; |
4709 | mddev->new_level = LEVEL_NONE; | |
4710 | mddev->new_layout = 0; | |
4711 | mddev->new_chunk_sectors = 0; | |
4712 | mddev->curr_resync = 0; | |
4713 | mddev->resync_mismatches = 0; | |
4714 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4715 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4716 | mddev->recovery = 0; | |
4717 | mddev->in_sync = 0; | |
f0b4f7e2 | 4718 | mddev->changed = 0; |
6177b472 | 4719 | mddev->degraded = 0; |
6177b472 N |
4720 | mddev->safemode = 0; |
4721 | mddev->bitmap_info.offset = 0; | |
4722 | mddev->bitmap_info.default_offset = 0; | |
4723 | mddev->bitmap_info.chunksize = 0; | |
4724 | mddev->bitmap_info.daemon_sleep = 0; | |
4725 | mddev->bitmap_info.max_write_behind = 0; | |
252ac522 | 4726 | mddev->plug = NULL; |
6177b472 N |
4727 | } |
4728 | ||
defad61a | 4729 | static void __md_stop_writes(mddev_t *mddev) |
a047e125 N |
4730 | { |
4731 | if (mddev->sync_thread) { | |
4732 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4733 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4734 | reap_sync_thread(mddev); |
a047e125 N |
4735 | } |
4736 | ||
4737 | del_timer_sync(&mddev->safemode_timer); | |
4738 | ||
4739 | bitmap_flush(mddev); | |
4740 | md_super_wait(mddev); | |
4741 | ||
4742 | if (!mddev->in_sync || mddev->flags) { | |
4743 | /* mark array as shutdown cleanly */ | |
4744 | mddev->in_sync = 1; | |
4745 | md_update_sb(mddev, 1); | |
4746 | } | |
4747 | } | |
defad61a N |
4748 | |
4749 | void md_stop_writes(mddev_t *mddev) | |
4750 | { | |
4751 | mddev_lock(mddev); | |
4752 | __md_stop_writes(mddev); | |
4753 | mddev_unlock(mddev); | |
4754 | } | |
390ee602 | 4755 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 4756 | |
390ee602 | 4757 | void md_stop(mddev_t *mddev) |
6177b472 | 4758 | { |
0ca69886 | 4759 | mddev->ready = 0; |
6177b472 N |
4760 | mddev->pers->stop(mddev); |
4761 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4762 | mddev->to_remove = &md_redundancy_group; | |
4763 | module_put(mddev->pers->owner); | |
4764 | mddev->pers = NULL; | |
cca9cf90 | 4765 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 4766 | } |
390ee602 | 4767 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 4768 | |
a4bd82d0 N |
4769 | static int md_set_readonly(mddev_t *mddev, int is_open) |
4770 | { | |
4771 | int err = 0; | |
4772 | mutex_lock(&mddev->open_mutex); | |
4773 | if (atomic_read(&mddev->openers) > is_open) { | |
4774 | printk("md: %s still in use.\n",mdname(mddev)); | |
4775 | err = -EBUSY; | |
4776 | goto out; | |
4777 | } | |
4778 | if (mddev->pers) { | |
defad61a | 4779 | __md_stop_writes(mddev); |
a4bd82d0 N |
4780 | |
4781 | err = -ENXIO; | |
4782 | if (mddev->ro==1) | |
4783 | goto out; | |
4784 | mddev->ro = 1; | |
4785 | set_disk_ro(mddev->gendisk, 1); | |
4786 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 4787 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
4788 | err = 0; |
4789 | } | |
4790 | out: | |
4791 | mutex_unlock(&mddev->open_mutex); | |
4792 | return err; | |
4793 | } | |
4794 | ||
9e653b63 N |
4795 | /* mode: |
4796 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
4797 | * 2 - stop but do not disassemble array |
4798 | */ | |
df5b20cf | 4799 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 | 4800 | { |
1da177e4 | 4801 | struct gendisk *disk = mddev->gendisk; |
c4647292 | 4802 | mdk_rdev_t *rdev; |
1da177e4 | 4803 | |
c8c00a69 | 4804 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
4805 | if (atomic_read(&mddev->openers) > is_open || |
4806 | mddev->sysfs_active) { | |
df5b20cf | 4807 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
4808 | mutex_unlock(&mddev->open_mutex); |
4809 | return -EBUSY; | |
4810 | } | |
1da177e4 | 4811 | |
6e17b027 | 4812 | if (mddev->pers) { |
a4bd82d0 N |
4813 | if (mddev->ro) |
4814 | set_disk_ro(disk, 0); | |
409c57f3 | 4815 | |
defad61a | 4816 | __md_stop_writes(mddev); |
a4bd82d0 N |
4817 | md_stop(mddev); |
4818 | mddev->queue->merge_bvec_fn = NULL; | |
a4bd82d0 | 4819 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 4820 | |
a4bd82d0 | 4821 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 4822 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 4823 | |
a4bd82d0 N |
4824 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4825 | if (rdev->raid_disk >= 0) { | |
4826 | char nm[20]; | |
4827 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4828 | sysfs_remove_link(&mddev->kobj, nm); | |
4829 | } | |
c4647292 | 4830 | |
a4bd82d0 | 4831 | set_capacity(disk, 0); |
6e17b027 | 4832 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 4833 | mddev->changed = 1; |
a4bd82d0 | 4834 | revalidate_disk(disk); |
0d4ca600 | 4835 | |
a4bd82d0 N |
4836 | if (mddev->ro) |
4837 | mddev->ro = 0; | |
6e17b027 N |
4838 | } else |
4839 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
4840 | /* |
4841 | * Free resources if final stop | |
4842 | */ | |
9e653b63 | 4843 | if (mode == 0) { |
1da177e4 LT |
4844 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4845 | ||
978f946b | 4846 | bitmap_destroy(mddev); |
c3d9714e N |
4847 | if (mddev->bitmap_info.file) { |
4848 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4849 | fput(mddev->bitmap_info.file); | |
4850 | mddev->bitmap_info.file = NULL; | |
978f946b | 4851 | } |
c3d9714e | 4852 | mddev->bitmap_info.offset = 0; |
978f946b | 4853 | |
1da177e4 LT |
4854 | export_array(mddev); |
4855 | ||
6177b472 | 4856 | md_clean(mddev); |
934d9c23 | 4857 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4858 | if (mddev->hold_active == UNTIL_STOP) |
4859 | mddev->hold_active = 0; | |
a4bd82d0 | 4860 | } |
3f9d99c1 | 4861 | blk_integrity_unregister(disk); |
d7603b7e | 4862 | md_new_event(mddev); |
00bcb4ac | 4863 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 4864 | return 0; |
1da177e4 LT |
4865 | } |
4866 | ||
fdee8ae4 | 4867 | #ifndef MODULE |
1da177e4 LT |
4868 | static void autorun_array(mddev_t *mddev) |
4869 | { | |
4870 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4871 | int err; |
4872 | ||
a757e64c | 4873 | if (list_empty(&mddev->disks)) |
1da177e4 | 4874 | return; |
1da177e4 LT |
4875 | |
4876 | printk(KERN_INFO "md: running: "); | |
4877 | ||
159ec1fc | 4878 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4879 | char b[BDEVNAME_SIZE]; |
4880 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4881 | } | |
4882 | printk("\n"); | |
4883 | ||
d710e138 | 4884 | err = do_md_run(mddev); |
1da177e4 LT |
4885 | if (err) { |
4886 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4887 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4888 | } |
4889 | } | |
4890 | ||
4891 | /* | |
4892 | * lets try to run arrays based on all disks that have arrived | |
4893 | * until now. (those are in pending_raid_disks) | |
4894 | * | |
4895 | * the method: pick the first pending disk, collect all disks with | |
4896 | * the same UUID, remove all from the pending list and put them into | |
4897 | * the 'same_array' list. Then order this list based on superblock | |
4898 | * update time (freshest comes first), kick out 'old' disks and | |
4899 | * compare superblocks. If everything's fine then run it. | |
4900 | * | |
4901 | * If "unit" is allocated, then bump its reference count | |
4902 | */ | |
4903 | static void autorun_devices(int part) | |
4904 | { | |
159ec1fc | 4905 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4906 | mddev_t *mddev; |
4907 | char b[BDEVNAME_SIZE]; | |
4908 | ||
4909 | printk(KERN_INFO "md: autorun ...\n"); | |
4910 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4911 | int unit; |
1da177e4 | 4912 | dev_t dev; |
ad01c9e3 | 4913 | LIST_HEAD(candidates); |
1da177e4 LT |
4914 | rdev0 = list_entry(pending_raid_disks.next, |
4915 | mdk_rdev_t, same_set); | |
4916 | ||
4917 | printk(KERN_INFO "md: considering %s ...\n", | |
4918 | bdevname(rdev0->bdev,b)); | |
4919 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4920 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4921 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4922 | printk(KERN_INFO "md: adding %s ...\n", | |
4923 | bdevname(rdev->bdev,b)); | |
4924 | list_move(&rdev->same_set, &candidates); | |
4925 | } | |
4926 | /* | |
4927 | * now we have a set of devices, with all of them having | |
4928 | * mostly sane superblocks. It's time to allocate the | |
4929 | * mddev. | |
4930 | */ | |
e8703fe1 N |
4931 | if (part) { |
4932 | dev = MKDEV(mdp_major, | |
4933 | rdev0->preferred_minor << MdpMinorShift); | |
4934 | unit = MINOR(dev) >> MdpMinorShift; | |
4935 | } else { | |
4936 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4937 | unit = MINOR(dev); | |
4938 | } | |
4939 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4940 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4941 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4942 | break; | |
4943 | } | |
1da177e4 LT |
4944 | |
4945 | md_probe(dev, NULL, NULL); | |
4946 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4947 | if (!mddev || !mddev->gendisk) { |
4948 | if (mddev) | |
4949 | mddev_put(mddev); | |
4950 | printk(KERN_ERR | |
1da177e4 LT |
4951 | "md: cannot allocate memory for md drive.\n"); |
4952 | break; | |
4953 | } | |
4954 | if (mddev_lock(mddev)) | |
4955 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4956 | mdname(mddev)); | |
4957 | else if (mddev->raid_disks || mddev->major_version | |
4958 | || !list_empty(&mddev->disks)) { | |
4959 | printk(KERN_WARNING | |
4960 | "md: %s already running, cannot run %s\n", | |
4961 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4962 | mddev_unlock(mddev); | |
4963 | } else { | |
4964 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4965 | mddev->persistent = 1; |
159ec1fc | 4966 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4967 | list_del_init(&rdev->same_set); |
4968 | if (bind_rdev_to_array(rdev, mddev)) | |
4969 | export_rdev(rdev); | |
4970 | } | |
4971 | autorun_array(mddev); | |
4972 | mddev_unlock(mddev); | |
4973 | } | |
4974 | /* on success, candidates will be empty, on error | |
4975 | * it won't... | |
4976 | */ | |
159ec1fc | 4977 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4978 | list_del_init(&rdev->same_set); |
1da177e4 | 4979 | export_rdev(rdev); |
4b80991c | 4980 | } |
1da177e4 LT |
4981 | mddev_put(mddev); |
4982 | } | |
4983 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4984 | } | |
fdee8ae4 | 4985 | #endif /* !MODULE */ |
1da177e4 | 4986 | |
1da177e4 LT |
4987 | static int get_version(void __user * arg) |
4988 | { | |
4989 | mdu_version_t ver; | |
4990 | ||
4991 | ver.major = MD_MAJOR_VERSION; | |
4992 | ver.minor = MD_MINOR_VERSION; | |
4993 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4994 | ||
4995 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4996 | return -EFAULT; | |
4997 | ||
4998 | return 0; | |
4999 | } | |
5000 | ||
5001 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
5002 | { | |
5003 | mdu_array_info_t info; | |
a9f326eb | 5004 | int nr,working,insync,failed,spare; |
1da177e4 | 5005 | mdk_rdev_t *rdev; |
1da177e4 | 5006 | |
a9f326eb | 5007 | nr=working=insync=failed=spare=0; |
159ec1fc | 5008 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 5009 | nr++; |
b2d444d7 | 5010 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5011 | failed++; |
5012 | else { | |
5013 | working++; | |
b2d444d7 | 5014 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 5015 | insync++; |
1da177e4 LT |
5016 | else |
5017 | spare++; | |
5018 | } | |
5019 | } | |
5020 | ||
5021 | info.major_version = mddev->major_version; | |
5022 | info.minor_version = mddev->minor_version; | |
5023 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5024 | info.ctime = mddev->ctime; | |
5025 | info.level = mddev->level; | |
58c0fed4 AN |
5026 | info.size = mddev->dev_sectors / 2; |
5027 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5028 | info.size = -1; |
1da177e4 LT |
5029 | info.nr_disks = nr; |
5030 | info.raid_disks = mddev->raid_disks; | |
5031 | info.md_minor = mddev->md_minor; | |
5032 | info.not_persistent= !mddev->persistent; | |
5033 | ||
5034 | info.utime = mddev->utime; | |
5035 | info.state = 0; | |
5036 | if (mddev->in_sync) | |
5037 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5038 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5039 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5040 | info.active_disks = insync; |
1da177e4 LT |
5041 | info.working_disks = working; |
5042 | info.failed_disks = failed; | |
5043 | info.spare_disks = spare; | |
5044 | ||
5045 | info.layout = mddev->layout; | |
9d8f0363 | 5046 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5047 | |
5048 | if (copy_to_user(arg, &info, sizeof(info))) | |
5049 | return -EFAULT; | |
5050 | ||
5051 | return 0; | |
5052 | } | |
5053 | ||
87162a28 | 5054 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
5055 | { |
5056 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5057 | char *ptr, *buf = NULL; | |
5058 | int err = -ENOMEM; | |
5059 | ||
b5470dc5 DW |
5060 | if (md_allow_write(mddev)) |
5061 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5062 | else | |
5063 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5064 | |
32a7627c N |
5065 | if (!file) |
5066 | goto out; | |
5067 | ||
5068 | /* bitmap disabled, zero the first byte and copy out */ | |
5069 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5070 | file->pathname[0] = '\0'; | |
5071 | goto copy_out; | |
5072 | } | |
5073 | ||
5074 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5075 | if (!buf) | |
5076 | goto out; | |
5077 | ||
6bcfd601 CH |
5078 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5079 | if (IS_ERR(ptr)) | |
32a7627c N |
5080 | goto out; |
5081 | ||
5082 | strcpy(file->pathname, ptr); | |
5083 | ||
5084 | copy_out: | |
5085 | err = 0; | |
5086 | if (copy_to_user(arg, file, sizeof(*file))) | |
5087 | err = -EFAULT; | |
5088 | out: | |
5089 | kfree(buf); | |
5090 | kfree(file); | |
5091 | return err; | |
5092 | } | |
5093 | ||
1da177e4 LT |
5094 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
5095 | { | |
5096 | mdu_disk_info_t info; | |
1da177e4 LT |
5097 | mdk_rdev_t *rdev; |
5098 | ||
5099 | if (copy_from_user(&info, arg, sizeof(info))) | |
5100 | return -EFAULT; | |
5101 | ||
26ef379f | 5102 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5103 | if (rdev) { |
5104 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5105 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5106 | info.raid_disk = rdev->raid_disk; | |
5107 | info.state = 0; | |
b2d444d7 | 5108 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5109 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5110 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5111 | info.state |= (1<<MD_DISK_ACTIVE); |
5112 | info.state |= (1<<MD_DISK_SYNC); | |
5113 | } | |
8ddf9efe N |
5114 | if (test_bit(WriteMostly, &rdev->flags)) |
5115 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5116 | } else { |
5117 | info.major = info.minor = 0; | |
5118 | info.raid_disk = -1; | |
5119 | info.state = (1<<MD_DISK_REMOVED); | |
5120 | } | |
5121 | ||
5122 | if (copy_to_user(arg, &info, sizeof(info))) | |
5123 | return -EFAULT; | |
5124 | ||
5125 | return 0; | |
5126 | } | |
5127 | ||
5128 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5129 | { | |
5130 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5131 | mdk_rdev_t *rdev; | |
5132 | dev_t dev = MKDEV(info->major,info->minor); | |
5133 | ||
5134 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5135 | return -EOVERFLOW; | |
5136 | ||
5137 | if (!mddev->raid_disks) { | |
5138 | int err; | |
5139 | /* expecting a device which has a superblock */ | |
5140 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5141 | if (IS_ERR(rdev)) { | |
5142 | printk(KERN_WARNING | |
5143 | "md: md_import_device returned %ld\n", | |
5144 | PTR_ERR(rdev)); | |
5145 | return PTR_ERR(rdev); | |
5146 | } | |
5147 | if (!list_empty(&mddev->disks)) { | |
5148 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5149 | mdk_rdev_t, same_set); | |
a9f326eb | 5150 | err = super_types[mddev->major_version] |
1da177e4 LT |
5151 | .load_super(rdev, rdev0, mddev->minor_version); |
5152 | if (err < 0) { | |
5153 | printk(KERN_WARNING | |
5154 | "md: %s has different UUID to %s\n", | |
5155 | bdevname(rdev->bdev,b), | |
5156 | bdevname(rdev0->bdev,b2)); | |
5157 | export_rdev(rdev); | |
5158 | return -EINVAL; | |
5159 | } | |
5160 | } | |
5161 | err = bind_rdev_to_array(rdev, mddev); | |
5162 | if (err) | |
5163 | export_rdev(rdev); | |
5164 | return err; | |
5165 | } | |
5166 | ||
5167 | /* | |
5168 | * add_new_disk can be used once the array is assembled | |
5169 | * to add "hot spares". They must already have a superblock | |
5170 | * written | |
5171 | */ | |
5172 | if (mddev->pers) { | |
5173 | int err; | |
5174 | if (!mddev->pers->hot_add_disk) { | |
5175 | printk(KERN_WARNING | |
5176 | "%s: personality does not support diskops!\n", | |
5177 | mdname(mddev)); | |
5178 | return -EINVAL; | |
5179 | } | |
7b1e35f6 N |
5180 | if (mddev->persistent) |
5181 | rdev = md_import_device(dev, mddev->major_version, | |
5182 | mddev->minor_version); | |
5183 | else | |
5184 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5185 | if (IS_ERR(rdev)) { |
5186 | printk(KERN_WARNING | |
5187 | "md: md_import_device returned %ld\n", | |
5188 | PTR_ERR(rdev)); | |
5189 | return PTR_ERR(rdev); | |
5190 | } | |
1a855a06 | 5191 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5192 | if (!mddev->persistent) { |
5193 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5194 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5195 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5196 | set_bit(In_sync, &rdev->flags); |
5197 | } else | |
41158c7e N |
5198 | rdev->raid_disk = -1; |
5199 | } else | |
5200 | super_types[mddev->major_version]. | |
5201 | validate_super(mddev, rdev); | |
1a855a06 N |
5202 | if (test_bit(In_sync, &rdev->flags)) |
5203 | rdev->saved_raid_disk = rdev->raid_disk; | |
5204 | else | |
5205 | rdev->saved_raid_disk = -1; | |
41158c7e | 5206 | |
b2d444d7 | 5207 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5208 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5209 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5210 | else |
5211 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5212 | |
1da177e4 LT |
5213 | rdev->raid_disk = -1; |
5214 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5215 | if (!err && !mddev->pers->hot_remove_disk) { |
5216 | /* If there is hot_add_disk but no hot_remove_disk | |
5217 | * then added disks for geometry changes, | |
5218 | * and should be added immediately. | |
5219 | */ | |
5220 | super_types[mddev->major_version]. | |
5221 | validate_super(mddev, rdev); | |
5222 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5223 | if (err) | |
5224 | unbind_rdev_from_array(rdev); | |
5225 | } | |
1da177e4 LT |
5226 | if (err) |
5227 | export_rdev(rdev); | |
52664732 | 5228 | else |
00bcb4ac | 5229 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5230 | |
17571284 | 5231 | md_update_sb(mddev, 1); |
72a23c21 NB |
5232 | if (mddev->degraded) |
5233 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5234 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 5235 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5236 | return err; |
5237 | } | |
5238 | ||
5239 | /* otherwise, add_new_disk is only allowed | |
5240 | * for major_version==0 superblocks | |
5241 | */ | |
5242 | if (mddev->major_version != 0) { | |
5243 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5244 | mdname(mddev)); | |
5245 | return -EINVAL; | |
5246 | } | |
5247 | ||
5248 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5249 | int err; | |
d710e138 | 5250 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5251 | if (IS_ERR(rdev)) { |
5252 | printk(KERN_WARNING | |
5253 | "md: error, md_import_device() returned %ld\n", | |
5254 | PTR_ERR(rdev)); | |
5255 | return PTR_ERR(rdev); | |
5256 | } | |
5257 | rdev->desc_nr = info->number; | |
5258 | if (info->raid_disk < mddev->raid_disks) | |
5259 | rdev->raid_disk = info->raid_disk; | |
5260 | else | |
5261 | rdev->raid_disk = -1; | |
5262 | ||
1da177e4 | 5263 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5264 | if (info->state & (1<<MD_DISK_SYNC)) |
5265 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5266 | |
8ddf9efe N |
5267 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5268 | set_bit(WriteMostly, &rdev->flags); | |
5269 | ||
1da177e4 LT |
5270 | if (!mddev->persistent) { |
5271 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5272 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5273 | } else | |
57b2caa3 | 5274 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5275 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5276 | |
2bf071bf N |
5277 | err = bind_rdev_to_array(rdev, mddev); |
5278 | if (err) { | |
5279 | export_rdev(rdev); | |
5280 | return err; | |
5281 | } | |
1da177e4 LT |
5282 | } |
5283 | ||
5284 | return 0; | |
5285 | } | |
5286 | ||
5287 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5288 | { | |
5289 | char b[BDEVNAME_SIZE]; | |
5290 | mdk_rdev_t *rdev; | |
5291 | ||
1da177e4 LT |
5292 | rdev = find_rdev(mddev, dev); |
5293 | if (!rdev) | |
5294 | return -ENXIO; | |
5295 | ||
5296 | if (rdev->raid_disk >= 0) | |
5297 | goto busy; | |
5298 | ||
5299 | kick_rdev_from_array(rdev); | |
850b2b42 | 5300 | md_update_sb(mddev, 1); |
d7603b7e | 5301 | md_new_event(mddev); |
1da177e4 LT |
5302 | |
5303 | return 0; | |
5304 | busy: | |
fdefa4d8 | 5305 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5306 | bdevname(rdev->bdev,b), mdname(mddev)); |
5307 | return -EBUSY; | |
5308 | } | |
5309 | ||
5310 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5311 | { | |
5312 | char b[BDEVNAME_SIZE]; | |
5313 | int err; | |
1da177e4 LT |
5314 | mdk_rdev_t *rdev; |
5315 | ||
5316 | if (!mddev->pers) | |
5317 | return -ENODEV; | |
5318 | ||
5319 | if (mddev->major_version != 0) { | |
5320 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5321 | " version-0 superblocks.\n", | |
5322 | mdname(mddev)); | |
5323 | return -EINVAL; | |
5324 | } | |
5325 | if (!mddev->pers->hot_add_disk) { | |
5326 | printk(KERN_WARNING | |
5327 | "%s: personality does not support diskops!\n", | |
5328 | mdname(mddev)); | |
5329 | return -EINVAL; | |
5330 | } | |
5331 | ||
d710e138 | 5332 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5333 | if (IS_ERR(rdev)) { |
5334 | printk(KERN_WARNING | |
5335 | "md: error, md_import_device() returned %ld\n", | |
5336 | PTR_ERR(rdev)); | |
5337 | return -EINVAL; | |
5338 | } | |
5339 | ||
5340 | if (mddev->persistent) | |
57b2caa3 | 5341 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5342 | else |
77304d2a | 5343 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5344 | |
8190e754 | 5345 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5346 | |
b2d444d7 | 5347 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5348 | printk(KERN_WARNING |
5349 | "md: can not hot-add faulty %s disk to %s!\n", | |
5350 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5351 | err = -EINVAL; | |
5352 | goto abort_export; | |
5353 | } | |
b2d444d7 | 5354 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5355 | rdev->desc_nr = -1; |
5842730d | 5356 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5357 | err = bind_rdev_to_array(rdev, mddev); |
5358 | if (err) | |
5359 | goto abort_export; | |
1da177e4 LT |
5360 | |
5361 | /* | |
5362 | * The rest should better be atomic, we can have disk failures | |
5363 | * noticed in interrupt contexts ... | |
5364 | */ | |
5365 | ||
1da177e4 LT |
5366 | rdev->raid_disk = -1; |
5367 | ||
850b2b42 | 5368 | md_update_sb(mddev, 1); |
1da177e4 LT |
5369 | |
5370 | /* | |
5371 | * Kick recovery, maybe this spare has to be added to the | |
5372 | * array immediately. | |
5373 | */ | |
5374 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5375 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5376 | md_new_event(mddev); |
1da177e4 LT |
5377 | return 0; |
5378 | ||
1da177e4 LT |
5379 | abort_export: |
5380 | export_rdev(rdev); | |
5381 | return err; | |
5382 | } | |
5383 | ||
32a7627c N |
5384 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5385 | { | |
5386 | int err; | |
5387 | ||
36fa3063 N |
5388 | if (mddev->pers) { |
5389 | if (!mddev->pers->quiesce) | |
5390 | return -EBUSY; | |
5391 | if (mddev->recovery || mddev->sync_thread) | |
5392 | return -EBUSY; | |
5393 | /* we should be able to change the bitmap.. */ | |
5394 | } | |
32a7627c | 5395 | |
32a7627c | 5396 | |
36fa3063 N |
5397 | if (fd >= 0) { |
5398 | if (mddev->bitmap) | |
5399 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5400 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5401 | |
c3d9714e | 5402 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5403 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5404 | mdname(mddev)); | |
5405 | return -EBADF; | |
5406 | } | |
5407 | ||
c3d9714e | 5408 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5409 | if (err) { |
5410 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5411 | mdname(mddev)); | |
c3d9714e N |
5412 | fput(mddev->bitmap_info.file); |
5413 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5414 | return err; |
5415 | } | |
c3d9714e | 5416 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5417 | } else if (mddev->bitmap == NULL) |
5418 | return -ENOENT; /* cannot remove what isn't there */ | |
5419 | err = 0; | |
5420 | if (mddev->pers) { | |
5421 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5422 | if (fd >= 0) { |
36fa3063 | 5423 | err = bitmap_create(mddev); |
69e51b44 N |
5424 | if (!err) |
5425 | err = bitmap_load(mddev); | |
5426 | } | |
d7375ab3 | 5427 | if (fd < 0 || err) { |
36fa3063 | 5428 | bitmap_destroy(mddev); |
d7375ab3 N |
5429 | fd = -1; /* make sure to put the file */ |
5430 | } | |
36fa3063 | 5431 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5432 | } |
5433 | if (fd < 0) { | |
c3d9714e N |
5434 | if (mddev->bitmap_info.file) { |
5435 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5436 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5437 | } |
c3d9714e | 5438 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5439 | } |
5440 | ||
32a7627c N |
5441 | return err; |
5442 | } | |
5443 | ||
1da177e4 LT |
5444 | /* |
5445 | * set_array_info is used two different ways | |
5446 | * The original usage is when creating a new array. | |
5447 | * In this usage, raid_disks is > 0 and it together with | |
5448 | * level, size, not_persistent,layout,chunksize determine the | |
5449 | * shape of the array. | |
5450 | * This will always create an array with a type-0.90.0 superblock. | |
5451 | * The newer usage is when assembling an array. | |
5452 | * In this case raid_disks will be 0, and the major_version field is | |
5453 | * use to determine which style super-blocks are to be found on the devices. | |
5454 | * The minor and patch _version numbers are also kept incase the | |
5455 | * super_block handler wishes to interpret them. | |
5456 | */ | |
5457 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5458 | { | |
5459 | ||
5460 | if (info->raid_disks == 0) { | |
5461 | /* just setting version number for superblock loading */ | |
5462 | if (info->major_version < 0 || | |
50511da3 | 5463 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5464 | super_types[info->major_version].name == NULL) { |
5465 | /* maybe try to auto-load a module? */ | |
5466 | printk(KERN_INFO | |
5467 | "md: superblock version %d not known\n", | |
5468 | info->major_version); | |
5469 | return -EINVAL; | |
5470 | } | |
5471 | mddev->major_version = info->major_version; | |
5472 | mddev->minor_version = info->minor_version; | |
5473 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5474 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5475 | /* ensure mddev_put doesn't delete this now that there |
5476 | * is some minimal configuration. | |
5477 | */ | |
5478 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5479 | return 0; |
5480 | } | |
5481 | mddev->major_version = MD_MAJOR_VERSION; | |
5482 | mddev->minor_version = MD_MINOR_VERSION; | |
5483 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5484 | mddev->ctime = get_seconds(); | |
5485 | ||
5486 | mddev->level = info->level; | |
17115e03 | 5487 | mddev->clevel[0] = 0; |
58c0fed4 | 5488 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5489 | mddev->raid_disks = info->raid_disks; |
5490 | /* don't set md_minor, it is determined by which /dev/md* was | |
5491 | * openned | |
5492 | */ | |
5493 | if (info->state & (1<<MD_SB_CLEAN)) | |
5494 | mddev->recovery_cp = MaxSector; | |
5495 | else | |
5496 | mddev->recovery_cp = 0; | |
5497 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5498 | mddev->external = 0; |
1da177e4 LT |
5499 | |
5500 | mddev->layout = info->layout; | |
9d8f0363 | 5501 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5502 | |
5503 | mddev->max_disks = MD_SB_DISKS; | |
5504 | ||
e691063a N |
5505 | if (mddev->persistent) |
5506 | mddev->flags = 0; | |
850b2b42 | 5507 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5508 | |
c3d9714e N |
5509 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5510 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5511 | |
f6705578 N |
5512 | mddev->reshape_position = MaxSector; |
5513 | ||
1da177e4 LT |
5514 | /* |
5515 | * Generate a 128 bit UUID | |
5516 | */ | |
5517 | get_random_bytes(mddev->uuid, 16); | |
5518 | ||
f6705578 | 5519 | mddev->new_level = mddev->level; |
664e7c41 | 5520 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5521 | mddev->new_layout = mddev->layout; |
5522 | mddev->delta_disks = 0; | |
5523 | ||
1da177e4 LT |
5524 | return 0; |
5525 | } | |
5526 | ||
1f403624 DW |
5527 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5528 | { | |
b522adcd DW |
5529 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5530 | ||
5531 | if (mddev->external_size) | |
5532 | return; | |
5533 | ||
1f403624 DW |
5534 | mddev->array_sectors = array_sectors; |
5535 | } | |
5536 | EXPORT_SYMBOL(md_set_array_sectors); | |
5537 | ||
d71f9f88 | 5538 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5539 | { |
159ec1fc | 5540 | mdk_rdev_t *rdev; |
a35b0d69 | 5541 | int rv; |
d71f9f88 | 5542 | int fit = (num_sectors == 0); |
a35b0d69 N |
5543 | |
5544 | if (mddev->pers->resize == NULL) | |
5545 | return -EINVAL; | |
d71f9f88 AN |
5546 | /* The "num_sectors" is the number of sectors of each device that |
5547 | * is used. This can only make sense for arrays with redundancy. | |
5548 | * linear and raid0 always use whatever space is available. We can only | |
5549 | * consider changing this number if no resync or reconstruction is | |
5550 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5551 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5552 | * of each device. If num_sectors is zero, we find the largest size |
5553 | * that fits. | |
a35b0d69 N |
5554 | */ |
5555 | if (mddev->sync_thread) | |
5556 | return -EBUSY; | |
dba034ee N |
5557 | if (mddev->bitmap) |
5558 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5559 | * grow, and re-add. | |
5560 | */ | |
5561 | return -EBUSY; | |
159ec1fc | 5562 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5563 | sector_t avail = rdev->sectors; |
01ab5662 | 5564 | |
d71f9f88 AN |
5565 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5566 | num_sectors = avail; | |
5567 | if (avail < num_sectors) | |
a35b0d69 N |
5568 | return -ENOSPC; |
5569 | } | |
d71f9f88 | 5570 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5571 | if (!rv) |
5572 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5573 | return rv; |
5574 | } | |
5575 | ||
da943b99 N |
5576 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5577 | { | |
5578 | int rv; | |
5579 | /* change the number of raid disks */ | |
63c70c4f | 5580 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5581 | return -EINVAL; |
5582 | if (raid_disks <= 0 || | |
233fca36 | 5583 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5584 | return -EINVAL; |
63c70c4f | 5585 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5586 | return -EBUSY; |
63c70c4f N |
5587 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5588 | ||
5589 | rv = mddev->pers->check_reshape(mddev); | |
de171cb9 N |
5590 | if (rv < 0) |
5591 | mddev->delta_disks = 0; | |
da943b99 N |
5592 | return rv; |
5593 | } | |
5594 | ||
5595 | ||
1da177e4 LT |
5596 | /* |
5597 | * update_array_info is used to change the configuration of an | |
5598 | * on-line array. | |
5599 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5600 | * fields in the info are checked against the array. | |
5601 | * Any differences that cannot be handled will cause an error. | |
5602 | * Normally, only one change can be managed at a time. | |
5603 | */ | |
5604 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5605 | { | |
5606 | int rv = 0; | |
5607 | int cnt = 0; | |
36fa3063 N |
5608 | int state = 0; |
5609 | ||
5610 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5611 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5612 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5613 | |
5614 | if (mddev->major_version != info->major_version || | |
5615 | mddev->minor_version != info->minor_version || | |
5616 | /* mddev->patch_version != info->patch_version || */ | |
5617 | mddev->ctime != info->ctime || | |
5618 | mddev->level != info->level || | |
5619 | /* mddev->layout != info->layout || */ | |
5620 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5621 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5622 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5623 | ((state^info->state) & 0xfffffe00) | |
5624 | ) | |
1da177e4 LT |
5625 | return -EINVAL; |
5626 | /* Check there is only one change */ | |
58c0fed4 AN |
5627 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5628 | cnt++; | |
5629 | if (mddev->raid_disks != info->raid_disks) | |
5630 | cnt++; | |
5631 | if (mddev->layout != info->layout) | |
5632 | cnt++; | |
5633 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5634 | cnt++; | |
5635 | if (cnt == 0) | |
5636 | return 0; | |
5637 | if (cnt > 1) | |
5638 | return -EINVAL; | |
1da177e4 LT |
5639 | |
5640 | if (mddev->layout != info->layout) { | |
5641 | /* Change layout | |
5642 | * we don't need to do anything at the md level, the | |
5643 | * personality will take care of it all. | |
5644 | */ | |
50ac168a | 5645 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5646 | return -EINVAL; |
597a711b N |
5647 | else { |
5648 | mddev->new_layout = info->layout; | |
50ac168a | 5649 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5650 | if (rv) |
5651 | mddev->new_layout = mddev->layout; | |
5652 | return rv; | |
5653 | } | |
1da177e4 | 5654 | } |
58c0fed4 | 5655 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5656 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5657 | |
da943b99 N |
5658 | if (mddev->raid_disks != info->raid_disks) |
5659 | rv = update_raid_disks(mddev, info->raid_disks); | |
5660 | ||
36fa3063 N |
5661 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5662 | if (mddev->pers->quiesce == NULL) | |
5663 | return -EINVAL; | |
5664 | if (mddev->recovery || mddev->sync_thread) | |
5665 | return -EBUSY; | |
5666 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5667 | /* add the bitmap */ | |
5668 | if (mddev->bitmap) | |
5669 | return -EEXIST; | |
c3d9714e | 5670 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5671 | return -EINVAL; |
c3d9714e N |
5672 | mddev->bitmap_info.offset = |
5673 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5674 | mddev->pers->quiesce(mddev, 1); |
5675 | rv = bitmap_create(mddev); | |
69e51b44 N |
5676 | if (!rv) |
5677 | rv = bitmap_load(mddev); | |
36fa3063 N |
5678 | if (rv) |
5679 | bitmap_destroy(mddev); | |
5680 | mddev->pers->quiesce(mddev, 0); | |
5681 | } else { | |
5682 | /* remove the bitmap */ | |
5683 | if (!mddev->bitmap) | |
5684 | return -ENOENT; | |
5685 | if (mddev->bitmap->file) | |
5686 | return -EINVAL; | |
5687 | mddev->pers->quiesce(mddev, 1); | |
5688 | bitmap_destroy(mddev); | |
5689 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5690 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5691 | } |
5692 | } | |
850b2b42 | 5693 | md_update_sb(mddev, 1); |
1da177e4 LT |
5694 | return rv; |
5695 | } | |
5696 | ||
5697 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5698 | { | |
5699 | mdk_rdev_t *rdev; | |
5700 | ||
5701 | if (mddev->pers == NULL) | |
5702 | return -ENODEV; | |
5703 | ||
5704 | rdev = find_rdev(mddev, dev); | |
5705 | if (!rdev) | |
5706 | return -ENODEV; | |
5707 | ||
5708 | md_error(mddev, rdev); | |
5709 | return 0; | |
5710 | } | |
5711 | ||
2f9618ce AN |
5712 | /* |
5713 | * We have a problem here : there is no easy way to give a CHS | |
5714 | * virtual geometry. We currently pretend that we have a 2 heads | |
5715 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5716 | * dosfs just mad... ;-) | |
5717 | */ | |
a885c8c4 CH |
5718 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5719 | { | |
5720 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5721 | ||
5722 | geo->heads = 2; | |
5723 | geo->sectors = 4; | |
49ce6cea | 5724 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5725 | return 0; |
5726 | } | |
5727 | ||
a39907fa | 5728 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5729 | unsigned int cmd, unsigned long arg) |
5730 | { | |
5731 | int err = 0; | |
5732 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5733 | mddev_t *mddev = NULL; |
e2218350 | 5734 | int ro; |
1da177e4 LT |
5735 | |
5736 | if (!capable(CAP_SYS_ADMIN)) | |
5737 | return -EACCES; | |
5738 | ||
5739 | /* | |
5740 | * Commands dealing with the RAID driver but not any | |
5741 | * particular array: | |
5742 | */ | |
5743 | switch (cmd) | |
5744 | { | |
5745 | case RAID_VERSION: | |
5746 | err = get_version(argp); | |
5747 | goto done; | |
5748 | ||
5749 | case PRINT_RAID_DEBUG: | |
5750 | err = 0; | |
5751 | md_print_devices(); | |
5752 | goto done; | |
5753 | ||
5754 | #ifndef MODULE | |
5755 | case RAID_AUTORUN: | |
5756 | err = 0; | |
5757 | autostart_arrays(arg); | |
5758 | goto done; | |
5759 | #endif | |
5760 | default:; | |
5761 | } | |
5762 | ||
5763 | /* | |
5764 | * Commands creating/starting a new array: | |
5765 | */ | |
5766 | ||
a39907fa | 5767 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5768 | |
5769 | if (!mddev) { | |
5770 | BUG(); | |
5771 | goto abort; | |
5772 | } | |
5773 | ||
1da177e4 LT |
5774 | err = mddev_lock(mddev); |
5775 | if (err) { | |
5776 | printk(KERN_INFO | |
5777 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5778 | err, cmd); | |
5779 | goto abort; | |
5780 | } | |
5781 | ||
5782 | switch (cmd) | |
5783 | { | |
5784 | case SET_ARRAY_INFO: | |
5785 | { | |
5786 | mdu_array_info_t info; | |
5787 | if (!arg) | |
5788 | memset(&info, 0, sizeof(info)); | |
5789 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5790 | err = -EFAULT; | |
5791 | goto abort_unlock; | |
5792 | } | |
5793 | if (mddev->pers) { | |
5794 | err = update_array_info(mddev, &info); | |
5795 | if (err) { | |
5796 | printk(KERN_WARNING "md: couldn't update" | |
5797 | " array info. %d\n", err); | |
5798 | goto abort_unlock; | |
5799 | } | |
5800 | goto done_unlock; | |
5801 | } | |
5802 | if (!list_empty(&mddev->disks)) { | |
5803 | printk(KERN_WARNING | |
5804 | "md: array %s already has disks!\n", | |
5805 | mdname(mddev)); | |
5806 | err = -EBUSY; | |
5807 | goto abort_unlock; | |
5808 | } | |
5809 | if (mddev->raid_disks) { | |
5810 | printk(KERN_WARNING | |
5811 | "md: array %s already initialised!\n", | |
5812 | mdname(mddev)); | |
5813 | err = -EBUSY; | |
5814 | goto abort_unlock; | |
5815 | } | |
5816 | err = set_array_info(mddev, &info); | |
5817 | if (err) { | |
5818 | printk(KERN_WARNING "md: couldn't set" | |
5819 | " array info. %d\n", err); | |
5820 | goto abort_unlock; | |
5821 | } | |
5822 | } | |
5823 | goto done_unlock; | |
5824 | ||
5825 | default:; | |
5826 | } | |
5827 | ||
5828 | /* | |
5829 | * Commands querying/configuring an existing array: | |
5830 | */ | |
32a7627c | 5831 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5832 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5833 | if ((!mddev->raid_disks && !mddev->external) |
5834 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5835 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5836 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5837 | err = -ENODEV; |
5838 | goto abort_unlock; | |
5839 | } | |
5840 | ||
5841 | /* | |
5842 | * Commands even a read-only array can execute: | |
5843 | */ | |
5844 | switch (cmd) | |
5845 | { | |
5846 | case GET_ARRAY_INFO: | |
5847 | err = get_array_info(mddev, argp); | |
5848 | goto done_unlock; | |
5849 | ||
32a7627c | 5850 | case GET_BITMAP_FILE: |
87162a28 | 5851 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5852 | goto done_unlock; |
5853 | ||
1da177e4 LT |
5854 | case GET_DISK_INFO: |
5855 | err = get_disk_info(mddev, argp); | |
5856 | goto done_unlock; | |
5857 | ||
5858 | case RESTART_ARRAY_RW: | |
5859 | err = restart_array(mddev); | |
5860 | goto done_unlock; | |
5861 | ||
5862 | case STOP_ARRAY: | |
d710e138 | 5863 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5864 | goto done_unlock; |
5865 | ||
5866 | case STOP_ARRAY_RO: | |
a4bd82d0 | 5867 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
5868 | goto done_unlock; |
5869 | ||
e2218350 DW |
5870 | case BLKROSET: |
5871 | if (get_user(ro, (int __user *)(arg))) { | |
5872 | err = -EFAULT; | |
5873 | goto done_unlock; | |
5874 | } | |
5875 | err = -EINVAL; | |
5876 | ||
5877 | /* if the bdev is going readonly the value of mddev->ro | |
5878 | * does not matter, no writes are coming | |
5879 | */ | |
5880 | if (ro) | |
5881 | goto done_unlock; | |
5882 | ||
5883 | /* are we are already prepared for writes? */ | |
5884 | if (mddev->ro != 1) | |
5885 | goto done_unlock; | |
5886 | ||
5887 | /* transitioning to readauto need only happen for | |
5888 | * arrays that call md_write_start | |
5889 | */ | |
5890 | if (mddev->pers) { | |
5891 | err = restart_array(mddev); | |
5892 | if (err == 0) { | |
5893 | mddev->ro = 2; | |
5894 | set_disk_ro(mddev->gendisk, 0); | |
5895 | } | |
5896 | } | |
5897 | goto done_unlock; | |
1da177e4 LT |
5898 | } |
5899 | ||
5900 | /* | |
5901 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5902 | * superblock, so we do not allow them on read-only arrays. |
5903 | * However non-MD ioctls (e.g. get-size) will still come through | |
5904 | * here and hit the 'default' below, so only disallow | |
5905 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5906 | */ |
bb57fc64 | 5907 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5908 | if (mddev->ro == 2) { |
5909 | mddev->ro = 0; | |
00bcb4ac | 5910 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
5911 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5912 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5913 | } else { |
5914 | err = -EROFS; | |
5915 | goto abort_unlock; | |
5916 | } | |
1da177e4 LT |
5917 | } |
5918 | ||
5919 | switch (cmd) | |
5920 | { | |
5921 | case ADD_NEW_DISK: | |
5922 | { | |
5923 | mdu_disk_info_t info; | |
5924 | if (copy_from_user(&info, argp, sizeof(info))) | |
5925 | err = -EFAULT; | |
5926 | else | |
5927 | err = add_new_disk(mddev, &info); | |
5928 | goto done_unlock; | |
5929 | } | |
5930 | ||
5931 | case HOT_REMOVE_DISK: | |
5932 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5933 | goto done_unlock; | |
5934 | ||
5935 | case HOT_ADD_DISK: | |
5936 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5937 | goto done_unlock; | |
5938 | ||
5939 | case SET_DISK_FAULTY: | |
5940 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5941 | goto done_unlock; | |
5942 | ||
5943 | case RUN_ARRAY: | |
d710e138 | 5944 | err = do_md_run(mddev); |
1da177e4 LT |
5945 | goto done_unlock; |
5946 | ||
32a7627c N |
5947 | case SET_BITMAP_FILE: |
5948 | err = set_bitmap_file(mddev, (int)arg); | |
5949 | goto done_unlock; | |
5950 | ||
1da177e4 | 5951 | default: |
1da177e4 LT |
5952 | err = -EINVAL; |
5953 | goto abort_unlock; | |
5954 | } | |
5955 | ||
5956 | done_unlock: | |
5957 | abort_unlock: | |
d3374825 N |
5958 | if (mddev->hold_active == UNTIL_IOCTL && |
5959 | err != -EINVAL) | |
5960 | mddev->hold_active = 0; | |
1da177e4 LT |
5961 | mddev_unlock(mddev); |
5962 | ||
5963 | return err; | |
5964 | done: | |
5965 | if (err) | |
5966 | MD_BUG(); | |
5967 | abort: | |
5968 | return err; | |
5969 | } | |
aa98aa31 AB |
5970 | #ifdef CONFIG_COMPAT |
5971 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
5972 | unsigned int cmd, unsigned long arg) | |
5973 | { | |
5974 | switch (cmd) { | |
5975 | case HOT_REMOVE_DISK: | |
5976 | case HOT_ADD_DISK: | |
5977 | case SET_DISK_FAULTY: | |
5978 | case SET_BITMAP_FILE: | |
5979 | /* These take in integer arg, do not convert */ | |
5980 | break; | |
5981 | default: | |
5982 | arg = (unsigned long)compat_ptr(arg); | |
5983 | break; | |
5984 | } | |
5985 | ||
5986 | return md_ioctl(bdev, mode, cmd, arg); | |
5987 | } | |
5988 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 5989 | |
a39907fa | 5990 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5991 | { |
5992 | /* | |
5993 | * Succeed if we can lock the mddev, which confirms that | |
5994 | * it isn't being stopped right now. | |
5995 | */ | |
d3374825 | 5996 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5997 | int err; |
5998 | ||
d3374825 N |
5999 | if (mddev->gendisk != bdev->bd_disk) { |
6000 | /* we are racing with mddev_put which is discarding this | |
6001 | * bd_disk. | |
6002 | */ | |
6003 | mddev_put(mddev); | |
6004 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6005 | flush_workqueue(md_misc_wq); |
d3374825 N |
6006 | /* Then retry the open from the top */ |
6007 | return -ERESTARTSYS; | |
6008 | } | |
6009 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6010 | ||
c8c00a69 | 6011 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6012 | goto out; |
6013 | ||
6014 | err = 0; | |
f2ea68cf | 6015 | atomic_inc(&mddev->openers); |
c8c00a69 | 6016 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6017 | |
f0b4f7e2 | 6018 | check_disk_change(bdev); |
1da177e4 LT |
6019 | out: |
6020 | return err; | |
6021 | } | |
6022 | ||
a39907fa | 6023 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6024 | { |
a39907fa | 6025 | mddev_t *mddev = disk->private_data; |
1da177e4 | 6026 | |
52e5f9d1 | 6027 | BUG_ON(!mddev); |
f2ea68cf | 6028 | atomic_dec(&mddev->openers); |
1da177e4 LT |
6029 | mddev_put(mddev); |
6030 | ||
6031 | return 0; | |
6032 | } | |
f0b4f7e2 N |
6033 | |
6034 | static int md_media_changed(struct gendisk *disk) | |
6035 | { | |
6036 | mddev_t *mddev = disk->private_data; | |
6037 | ||
6038 | return mddev->changed; | |
6039 | } | |
6040 | ||
6041 | static int md_revalidate(struct gendisk *disk) | |
6042 | { | |
6043 | mddev_t *mddev = disk->private_data; | |
6044 | ||
6045 | mddev->changed = 0; | |
6046 | return 0; | |
6047 | } | |
83d5cde4 | 6048 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6049 | { |
6050 | .owner = THIS_MODULE, | |
a39907fa AV |
6051 | .open = md_open, |
6052 | .release = md_release, | |
b492b852 | 6053 | .ioctl = md_ioctl, |
aa98aa31 AB |
6054 | #ifdef CONFIG_COMPAT |
6055 | .compat_ioctl = md_compat_ioctl, | |
6056 | #endif | |
a885c8c4 | 6057 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6058 | .media_changed = md_media_changed, |
6059 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6060 | }; |
6061 | ||
75c96f85 | 6062 | static int md_thread(void * arg) |
1da177e4 LT |
6063 | { |
6064 | mdk_thread_t *thread = arg; | |
6065 | ||
1da177e4 LT |
6066 | /* |
6067 | * md_thread is a 'system-thread', it's priority should be very | |
6068 | * high. We avoid resource deadlocks individually in each | |
6069 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6070 | * the very same RT priority as kswapd, thus we will never get | |
6071 | * into a priority inversion deadlock. | |
6072 | * | |
6073 | * we definitely have to have equal or higher priority than | |
6074 | * bdflush, otherwise bdflush will deadlock if there are too | |
6075 | * many dirty RAID5 blocks. | |
6076 | */ | |
1da177e4 | 6077 | |
6985c43f | 6078 | allow_signal(SIGKILL); |
a6fb0934 | 6079 | while (!kthread_should_stop()) { |
1da177e4 | 6080 | |
93588e22 N |
6081 | /* We need to wait INTERRUPTIBLE so that |
6082 | * we don't add to the load-average. | |
6083 | * That means we need to be sure no signals are | |
6084 | * pending | |
6085 | */ | |
6086 | if (signal_pending(current)) | |
6087 | flush_signals(current); | |
6088 | ||
6089 | wait_event_interruptible_timeout | |
6090 | (thread->wqueue, | |
6091 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6092 | || kthread_should_stop(), | |
6093 | thread->timeout); | |
1da177e4 | 6094 | |
6c987910 N |
6095 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6096 | if (!kthread_should_stop()) | |
589a594b | 6097 | thread->run(thread->mddev); |
1da177e4 | 6098 | } |
a6fb0934 | 6099 | |
1da177e4 LT |
6100 | return 0; |
6101 | } | |
6102 | ||
6103 | void md_wakeup_thread(mdk_thread_t *thread) | |
6104 | { | |
6105 | if (thread) { | |
6106 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
6107 | set_bit(THREAD_WAKEUP, &thread->flags); | |
6108 | wake_up(&thread->wqueue); | |
6109 | } | |
6110 | } | |
6111 | ||
6112 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
6113 | const char *name) | |
6114 | { | |
6115 | mdk_thread_t *thread; | |
1da177e4 | 6116 | |
9ffae0cf | 6117 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
6118 | if (!thread) |
6119 | return NULL; | |
6120 | ||
1da177e4 LT |
6121 | init_waitqueue_head(&thread->wqueue); |
6122 | ||
1da177e4 LT |
6123 | thread->run = run; |
6124 | thread->mddev = mddev; | |
32a7627c | 6125 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6126 | thread->tsk = kthread_run(md_thread, thread, |
6127 | "%s_%s", | |
6128 | mdname(thread->mddev), | |
6129 | name ?: mddev->pers->name); | |
a6fb0934 | 6130 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6131 | kfree(thread); |
6132 | return NULL; | |
6133 | } | |
1da177e4 LT |
6134 | return thread; |
6135 | } | |
6136 | ||
1da177e4 LT |
6137 | void md_unregister_thread(mdk_thread_t *thread) |
6138 | { | |
e0cf8f04 N |
6139 | if (!thread) |
6140 | return; | |
ba25f9dc | 6141 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6142 | |
6143 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6144 | kfree(thread); |
6145 | } | |
6146 | ||
6147 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6148 | { | |
6149 | if (!mddev) { | |
6150 | MD_BUG(); | |
6151 | return; | |
6152 | } | |
6153 | ||
b2d444d7 | 6154 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6155 | return; |
6bfe0b49 DW |
6156 | |
6157 | if (mddev->external) | |
6158 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6159 | /* |
1da177e4 LT |
6160 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6161 | mdname(mddev), | |
6162 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6163 | __builtin_return_address(0),__builtin_return_address(1), | |
6164 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6165 | */ |
d0a0a5ee AM |
6166 | if (!mddev->pers) |
6167 | return; | |
1da177e4 LT |
6168 | if (!mddev->pers->error_handler) |
6169 | return; | |
6170 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6171 | if (mddev->degraded) |
6172 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6173 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6174 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6175 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6176 | md_wakeup_thread(mddev->thread); | |
768a418d | 6177 | if (mddev->event_work.func) |
e804ac78 | 6178 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6179 | md_new_event_inintr(mddev); |
1da177e4 LT |
6180 | } |
6181 | ||
6182 | /* seq_file implementation /proc/mdstat */ | |
6183 | ||
6184 | static void status_unused(struct seq_file *seq) | |
6185 | { | |
6186 | int i = 0; | |
6187 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6188 | |
6189 | seq_printf(seq, "unused devices: "); | |
6190 | ||
159ec1fc | 6191 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6192 | char b[BDEVNAME_SIZE]; |
6193 | i++; | |
6194 | seq_printf(seq, "%s ", | |
6195 | bdevname(rdev->bdev,b)); | |
6196 | } | |
6197 | if (!i) | |
6198 | seq_printf(seq, "<none>"); | |
6199 | ||
6200 | seq_printf(seq, "\n"); | |
6201 | } | |
6202 | ||
6203 | ||
6204 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6205 | { | |
dd71cf6b N |
6206 | sector_t max_sectors, resync, res; |
6207 | unsigned long dt, db; | |
6208 | sector_t rt; | |
4588b42e N |
6209 | int scale; |
6210 | unsigned int per_milli; | |
1da177e4 | 6211 | |
dd71cf6b | 6212 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6213 | |
6214 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6215 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6216 | else |
dd71cf6b | 6217 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6218 | |
6219 | /* | |
6220 | * Should not happen. | |
6221 | */ | |
dd71cf6b | 6222 | if (!max_sectors) { |
1da177e4 LT |
6223 | MD_BUG(); |
6224 | return; | |
6225 | } | |
4588b42e | 6226 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6227 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6228 | * u32, as those are the requirements for sector_div. |
6229 | * Thus 'scale' must be at least 10 | |
6230 | */ | |
6231 | scale = 10; | |
6232 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6233 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6234 | scale++; |
6235 | } | |
6236 | res = (resync>>scale)*1000; | |
dd71cf6b | 6237 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6238 | |
6239 | per_milli = res; | |
1da177e4 | 6240 | { |
4588b42e | 6241 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6242 | seq_printf(seq, "["); |
6243 | for (i = 0; i < x; i++) | |
6244 | seq_printf(seq, "="); | |
6245 | seq_printf(seq, ">"); | |
6246 | for (i = 0; i < y; i++) | |
6247 | seq_printf(seq, "."); | |
6248 | seq_printf(seq, "] "); | |
6249 | } | |
4588b42e | 6250 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6251 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6252 | "reshape" : | |
61df9d91 N |
6253 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6254 | "check" : | |
6255 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6256 | "resync" : "recovery"))), | |
6257 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6258 | (unsigned long long) resync/2, |
6259 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6260 | |
6261 | /* | |
1da177e4 LT |
6262 | * dt: time from mark until now |
6263 | * db: blocks written from mark until now | |
6264 | * rt: remaining time | |
dd71cf6b N |
6265 | * |
6266 | * rt is a sector_t, so could be 32bit or 64bit. | |
6267 | * So we divide before multiply in case it is 32bit and close | |
6268 | * to the limit. | |
25985edc | 6269 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6270 | * near the end of resync when the number of remaining sectors |
6271 | * is close to 'db'. | |
6272 | * We then divide rt by 32 after multiplying by db to compensate. | |
6273 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6274 | */ |
6275 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6276 | if (!dt) dt++; | |
ff4e8d9a N |
6277 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6278 | - mddev->resync_mark_cnt; | |
1da177e4 | 6279 | |
dd71cf6b N |
6280 | rt = max_sectors - resync; /* number of remaining sectors */ |
6281 | sector_div(rt, db/32+1); | |
6282 | rt *= dt; | |
6283 | rt >>= 5; | |
6284 | ||
6285 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6286 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6287 | |
ff4e8d9a | 6288 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6289 | } |
6290 | ||
6291 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6292 | { | |
6293 | struct list_head *tmp; | |
6294 | loff_t l = *pos; | |
6295 | mddev_t *mddev; | |
6296 | ||
6297 | if (l >= 0x10000) | |
6298 | return NULL; | |
6299 | if (!l--) | |
6300 | /* header */ | |
6301 | return (void*)1; | |
6302 | ||
6303 | spin_lock(&all_mddevs_lock); | |
6304 | list_for_each(tmp,&all_mddevs) | |
6305 | if (!l--) { | |
6306 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6307 | mddev_get(mddev); | |
6308 | spin_unlock(&all_mddevs_lock); | |
6309 | return mddev; | |
6310 | } | |
6311 | spin_unlock(&all_mddevs_lock); | |
6312 | if (!l--) | |
6313 | return (void*)2;/* tail */ | |
6314 | return NULL; | |
6315 | } | |
6316 | ||
6317 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6318 | { | |
6319 | struct list_head *tmp; | |
6320 | mddev_t *next_mddev, *mddev = v; | |
6321 | ||
6322 | ++*pos; | |
6323 | if (v == (void*)2) | |
6324 | return NULL; | |
6325 | ||
6326 | spin_lock(&all_mddevs_lock); | |
6327 | if (v == (void*)1) | |
6328 | tmp = all_mddevs.next; | |
6329 | else | |
6330 | tmp = mddev->all_mddevs.next; | |
6331 | if (tmp != &all_mddevs) | |
6332 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6333 | else { | |
6334 | next_mddev = (void*)2; | |
6335 | *pos = 0x10000; | |
6336 | } | |
6337 | spin_unlock(&all_mddevs_lock); | |
6338 | ||
6339 | if (v != (void*)1) | |
6340 | mddev_put(mddev); | |
6341 | return next_mddev; | |
6342 | ||
6343 | } | |
6344 | ||
6345 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6346 | { | |
6347 | mddev_t *mddev = v; | |
6348 | ||
6349 | if (mddev && v != (void*)1 && v != (void*)2) | |
6350 | mddev_put(mddev); | |
6351 | } | |
6352 | ||
d7603b7e N |
6353 | struct mdstat_info { |
6354 | int event; | |
6355 | }; | |
6356 | ||
1da177e4 LT |
6357 | static int md_seq_show(struct seq_file *seq, void *v) |
6358 | { | |
6359 | mddev_t *mddev = v; | |
dd8ac336 | 6360 | sector_t sectors; |
1da177e4 | 6361 | mdk_rdev_t *rdev; |
d7603b7e | 6362 | struct mdstat_info *mi = seq->private; |
32a7627c | 6363 | struct bitmap *bitmap; |
1da177e4 LT |
6364 | |
6365 | if (v == (void*)1) { | |
2604b703 | 6366 | struct mdk_personality *pers; |
1da177e4 LT |
6367 | seq_printf(seq, "Personalities : "); |
6368 | spin_lock(&pers_lock); | |
2604b703 N |
6369 | list_for_each_entry(pers, &pers_list, list) |
6370 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6371 | |
6372 | spin_unlock(&pers_lock); | |
6373 | seq_printf(seq, "\n"); | |
d7603b7e | 6374 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6375 | return 0; |
6376 | } | |
6377 | if (v == (void*)2) { | |
6378 | status_unused(seq); | |
6379 | return 0; | |
6380 | } | |
6381 | ||
5dc5cf7d | 6382 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6383 | return -EINTR; |
5dc5cf7d | 6384 | |
1da177e4 LT |
6385 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6386 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6387 | mddev->pers ? "" : "in"); | |
6388 | if (mddev->pers) { | |
f91de92e | 6389 | if (mddev->ro==1) |
1da177e4 | 6390 | seq_printf(seq, " (read-only)"); |
f91de92e | 6391 | if (mddev->ro==2) |
52720ae7 | 6392 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6393 | seq_printf(seq, " %s", mddev->pers->name); |
6394 | } | |
6395 | ||
dd8ac336 | 6396 | sectors = 0; |
159ec1fc | 6397 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6398 | char b[BDEVNAME_SIZE]; |
6399 | seq_printf(seq, " %s[%d]", | |
6400 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6401 | if (test_bit(WriteMostly, &rdev->flags)) |
6402 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6403 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6404 | seq_printf(seq, "(F)"); |
6405 | continue; | |
b325a32e N |
6406 | } else if (rdev->raid_disk < 0) |
6407 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6408 | sectors += rdev->sectors; |
1da177e4 LT |
6409 | } |
6410 | ||
6411 | if (!list_empty(&mddev->disks)) { | |
6412 | if (mddev->pers) | |
6413 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6414 | (unsigned long long) |
6415 | mddev->array_sectors / 2); | |
1da177e4 LT |
6416 | else |
6417 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6418 | (unsigned long long)sectors / 2); |
1da177e4 | 6419 | } |
1cd6bf19 N |
6420 | if (mddev->persistent) { |
6421 | if (mddev->major_version != 0 || | |
6422 | mddev->minor_version != 90) { | |
6423 | seq_printf(seq," super %d.%d", | |
6424 | mddev->major_version, | |
6425 | mddev->minor_version); | |
6426 | } | |
e691063a N |
6427 | } else if (mddev->external) |
6428 | seq_printf(seq, " super external:%s", | |
6429 | mddev->metadata_type); | |
6430 | else | |
1cd6bf19 | 6431 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6432 | |
6433 | if (mddev->pers) { | |
d710e138 | 6434 | mddev->pers->status(seq, mddev); |
1da177e4 | 6435 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6436 | if (mddev->pers->sync_request) { |
6437 | if (mddev->curr_resync > 2) { | |
d710e138 | 6438 | status_resync(seq, mddev); |
8e1b39d6 N |
6439 | seq_printf(seq, "\n "); |
6440 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6441 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6442 | else if (mddev->recovery_cp < MaxSector) | |
6443 | seq_printf(seq, "\tresync=PENDING\n "); | |
6444 | } | |
32a7627c N |
6445 | } else |
6446 | seq_printf(seq, "\n "); | |
6447 | ||
6448 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6449 | unsigned long chunk_kb; |
6450 | unsigned long flags; | |
32a7627c | 6451 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6452 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6453 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6454 | "%lu%s chunk", | |
6455 | bitmap->pages - bitmap->missing_pages, | |
6456 | bitmap->pages, | |
6457 | (bitmap->pages - bitmap->missing_pages) | |
6458 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6459 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6460 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6461 | if (bitmap->file) { |
6462 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6463 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6464 | } |
78d742d8 | 6465 | |
32a7627c N |
6466 | seq_printf(seq, "\n"); |
6467 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6468 | } |
6469 | ||
6470 | seq_printf(seq, "\n"); | |
6471 | } | |
6472 | mddev_unlock(mddev); | |
6473 | ||
6474 | return 0; | |
6475 | } | |
6476 | ||
110518bc | 6477 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6478 | .start = md_seq_start, |
6479 | .next = md_seq_next, | |
6480 | .stop = md_seq_stop, | |
6481 | .show = md_seq_show, | |
6482 | }; | |
6483 | ||
6484 | static int md_seq_open(struct inode *inode, struct file *file) | |
6485 | { | |
6486 | int error; | |
d7603b7e N |
6487 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6488 | if (mi == NULL) | |
6489 | return -ENOMEM; | |
1da177e4 LT |
6490 | |
6491 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6492 | if (error) |
6493 | kfree(mi); | |
6494 | else { | |
6495 | struct seq_file *p = file->private_data; | |
6496 | p->private = mi; | |
6497 | mi->event = atomic_read(&md_event_count); | |
6498 | } | |
1da177e4 LT |
6499 | return error; |
6500 | } | |
6501 | ||
d7603b7e N |
6502 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6503 | { | |
6504 | struct seq_file *m = filp->private_data; | |
6505 | struct mdstat_info *mi = m->private; | |
6506 | int mask; | |
6507 | ||
6508 | poll_wait(filp, &md_event_waiters, wait); | |
6509 | ||
6510 | /* always allow read */ | |
6511 | mask = POLLIN | POLLRDNORM; | |
6512 | ||
6513 | if (mi->event != atomic_read(&md_event_count)) | |
6514 | mask |= POLLERR | POLLPRI; | |
6515 | return mask; | |
6516 | } | |
6517 | ||
fa027c2a | 6518 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6519 | .owner = THIS_MODULE, |
1da177e4 LT |
6520 | .open = md_seq_open, |
6521 | .read = seq_read, | |
6522 | .llseek = seq_lseek, | |
c3f94b40 | 6523 | .release = seq_release_private, |
d7603b7e | 6524 | .poll = mdstat_poll, |
1da177e4 LT |
6525 | }; |
6526 | ||
2604b703 | 6527 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6528 | { |
1da177e4 | 6529 | spin_lock(&pers_lock); |
2604b703 N |
6530 | list_add_tail(&p->list, &pers_list); |
6531 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6532 | spin_unlock(&pers_lock); |
6533 | return 0; | |
6534 | } | |
6535 | ||
2604b703 | 6536 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6537 | { |
2604b703 | 6538 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6539 | spin_lock(&pers_lock); |
2604b703 | 6540 | list_del_init(&p->list); |
1da177e4 LT |
6541 | spin_unlock(&pers_lock); |
6542 | return 0; | |
6543 | } | |
6544 | ||
eea1bf38 | 6545 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6546 | { |
6547 | mdk_rdev_t * rdev; | |
1da177e4 | 6548 | int idle; |
eea1bf38 | 6549 | int curr_events; |
1da177e4 LT |
6550 | |
6551 | idle = 1; | |
4b80991c N |
6552 | rcu_read_lock(); |
6553 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6554 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6555 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6556 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6557 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6558 | /* sync IO will cause sync_io to increase before the disk_stats |
6559 | * as sync_io is counted when a request starts, and | |
6560 | * disk_stats is counted when it completes. | |
6561 | * So resync activity will cause curr_events to be smaller than | |
6562 | * when there was no such activity. | |
6563 | * non-sync IO will cause disk_stat to increase without | |
6564 | * increasing sync_io so curr_events will (eventually) | |
6565 | * be larger than it was before. Once it becomes | |
6566 | * substantially larger, the test below will cause | |
6567 | * the array to appear non-idle, and resync will slow | |
6568 | * down. | |
6569 | * If there is a lot of outstanding resync activity when | |
6570 | * we set last_event to curr_events, then all that activity | |
6571 | * completing might cause the array to appear non-idle | |
6572 | * and resync will be slowed down even though there might | |
6573 | * not have been non-resync activity. This will only | |
6574 | * happen once though. 'last_events' will soon reflect | |
6575 | * the state where there is little or no outstanding | |
6576 | * resync requests, and further resync activity will | |
6577 | * always make curr_events less than last_events. | |
c0e48521 | 6578 | * |
1da177e4 | 6579 | */ |
eea1bf38 | 6580 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6581 | rdev->last_events = curr_events; |
6582 | idle = 0; | |
6583 | } | |
6584 | } | |
4b80991c | 6585 | rcu_read_unlock(); |
1da177e4 LT |
6586 | return idle; |
6587 | } | |
6588 | ||
6589 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6590 | { | |
6591 | /* another "blocks" (512byte) blocks have been synced */ | |
6592 | atomic_sub(blocks, &mddev->recovery_active); | |
6593 | wake_up(&mddev->recovery_wait); | |
6594 | if (!ok) { | |
dfc70645 | 6595 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6596 | md_wakeup_thread(mddev->thread); |
6597 | // stop recovery, signal do_sync .... | |
6598 | } | |
6599 | } | |
6600 | ||
6601 | ||
06d91a5f N |
6602 | /* md_write_start(mddev, bi) |
6603 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6604 | * in superblock) before writing, schedule a superblock update |
6605 | * and wait for it to complete. | |
06d91a5f | 6606 | */ |
3d310eb7 | 6607 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6608 | { |
0fd62b86 | 6609 | int did_change = 0; |
06d91a5f | 6610 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6611 | return; |
06d91a5f | 6612 | |
f91de92e N |
6613 | BUG_ON(mddev->ro == 1); |
6614 | if (mddev->ro == 2) { | |
6615 | /* need to switch to read/write */ | |
6616 | mddev->ro = 0; | |
6617 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6618 | md_wakeup_thread(mddev->thread); | |
25156198 | 6619 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6620 | did_change = 1; |
f91de92e | 6621 | } |
06d91a5f | 6622 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6623 | if (mddev->safemode == 1) |
6624 | mddev->safemode = 0; | |
06d91a5f | 6625 | if (mddev->in_sync) { |
a9701a30 | 6626 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6627 | if (mddev->in_sync) { |
6628 | mddev->in_sync = 0; | |
850b2b42 | 6629 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6630 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6631 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6632 | did_change = 1; |
3d310eb7 | 6633 | } |
a9701a30 | 6634 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6635 | } |
0fd62b86 | 6636 | if (did_change) |
00bcb4ac | 6637 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 6638 | wait_event(mddev->sb_wait, |
09a44cc1 | 6639 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
6640 | } |
6641 | ||
6642 | void md_write_end(mddev_t *mddev) | |
6643 | { | |
6644 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6645 | if (mddev->safemode == 2) | |
6646 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6647 | else if (mddev->safemode_delay) |
1da177e4 LT |
6648 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6649 | } | |
6650 | } | |
6651 | ||
2a2275d6 N |
6652 | /* md_allow_write(mddev) |
6653 | * Calling this ensures that the array is marked 'active' so that writes | |
6654 | * may proceed without blocking. It is important to call this before | |
6655 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6656 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6657 | * |
6658 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6659 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6660 | */ |
b5470dc5 | 6661 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6662 | { |
6663 | if (!mddev->pers) | |
b5470dc5 | 6664 | return 0; |
2a2275d6 | 6665 | if (mddev->ro) |
b5470dc5 | 6666 | return 0; |
1a0fd497 | 6667 | if (!mddev->pers->sync_request) |
b5470dc5 | 6668 | return 0; |
2a2275d6 N |
6669 | |
6670 | spin_lock_irq(&mddev->write_lock); | |
6671 | if (mddev->in_sync) { | |
6672 | mddev->in_sync = 0; | |
6673 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 6674 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
6675 | if (mddev->safemode_delay && |
6676 | mddev->safemode == 0) | |
6677 | mddev->safemode = 1; | |
6678 | spin_unlock_irq(&mddev->write_lock); | |
6679 | md_update_sb(mddev, 0); | |
00bcb4ac | 6680 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6681 | } else |
6682 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 6683 | |
070dc6dd | 6684 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
6685 | return -EAGAIN; |
6686 | else | |
6687 | return 0; | |
2a2275d6 N |
6688 | } |
6689 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6690 | ||
b63d7c2e | 6691 | void md_unplug(mddev_t *mddev) |
252ac522 | 6692 | { |
252ac522 N |
6693 | if (mddev->plug) |
6694 | mddev->plug->unplug_fn(mddev->plug); | |
6695 | } | |
6696 | ||
1da177e4 LT |
6697 | #define SYNC_MARKS 10 |
6698 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6699 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6700 | { |
6701 | mddev_t *mddev2; | |
6702 | unsigned int currspeed = 0, | |
6703 | window; | |
57afd89f | 6704 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6705 | unsigned long mark[SYNC_MARKS]; |
6706 | sector_t mark_cnt[SYNC_MARKS]; | |
6707 | int last_mark,m; | |
6708 | struct list_head *tmp; | |
6709 | sector_t last_check; | |
57afd89f | 6710 | int skipped = 0; |
5fd6c1dc | 6711 | mdk_rdev_t *rdev; |
61df9d91 | 6712 | char *desc; |
1da177e4 LT |
6713 | |
6714 | /* just incase thread restarts... */ | |
6715 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6716 | return; | |
5fd6c1dc N |
6717 | if (mddev->ro) /* never try to sync a read-only array */ |
6718 | return; | |
1da177e4 | 6719 | |
61df9d91 N |
6720 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6721 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6722 | desc = "data-check"; | |
6723 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6724 | desc = "requested-resync"; | |
6725 | else | |
6726 | desc = "resync"; | |
6727 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6728 | desc = "reshape"; | |
6729 | else | |
6730 | desc = "recovery"; | |
6731 | ||
1da177e4 LT |
6732 | /* we overload curr_resync somewhat here. |
6733 | * 0 == not engaged in resync at all | |
6734 | * 2 == checking that there is no conflict with another sync | |
6735 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6736 | * commense | |
6737 | * other == active in resync - this many blocks | |
6738 | * | |
6739 | * Before starting a resync we must have set curr_resync to | |
6740 | * 2, and then checked that every "conflicting" array has curr_resync | |
6741 | * less than ours. When we find one that is the same or higher | |
6742 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6743 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6744 | * This will mean we have to start checking from the beginning again. | |
6745 | * | |
6746 | */ | |
6747 | ||
6748 | do { | |
6749 | mddev->curr_resync = 2; | |
6750 | ||
6751 | try_again: | |
404e4b43 | 6752 | if (kthread_should_stop()) |
6985c43f | 6753 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6754 | |
6755 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6756 | goto skip; |
29ac4aa3 | 6757 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6758 | if (mddev2 == mddev) |
6759 | continue; | |
90b08710 BS |
6760 | if (!mddev->parallel_resync |
6761 | && mddev2->curr_resync | |
6762 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6763 | DEFINE_WAIT(wq); |
6764 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6765 | /* arbitrarily yield */ | |
6766 | mddev->curr_resync = 1; | |
6767 | wake_up(&resync_wait); | |
6768 | } | |
6769 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6770 | /* no need to wait here, we can wait the next | |
6771 | * time 'round when curr_resync == 2 | |
6772 | */ | |
6773 | continue; | |
9744197c N |
6774 | /* We need to wait 'interruptible' so as not to |
6775 | * contribute to the load average, and not to | |
6776 | * be caught by 'softlockup' | |
6777 | */ | |
6778 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6779 | if (!kthread_should_stop() && |
8712e553 | 6780 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6781 | printk(KERN_INFO "md: delaying %s of %s" |
6782 | " until %s has finished (they" | |
1da177e4 | 6783 | " share one or more physical units)\n", |
61df9d91 | 6784 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6785 | mddev_put(mddev2); |
9744197c N |
6786 | if (signal_pending(current)) |
6787 | flush_signals(current); | |
1da177e4 LT |
6788 | schedule(); |
6789 | finish_wait(&resync_wait, &wq); | |
6790 | goto try_again; | |
6791 | } | |
6792 | finish_wait(&resync_wait, &wq); | |
6793 | } | |
6794 | } | |
6795 | } while (mddev->curr_resync < 2); | |
6796 | ||
5fd6c1dc | 6797 | j = 0; |
9d88883e | 6798 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6799 | /* resync follows the size requested by the personality, |
57afd89f | 6800 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6801 | */ |
6802 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6803 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6804 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6805 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6806 | j = mddev->resync_min; | |
6807 | else if (!mddev->bitmap) | |
5fd6c1dc | 6808 | j = mddev->recovery_cp; |
5e96ee65 | 6809 | |
ccfcc3c1 | 6810 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6811 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6812 | else { |
1da177e4 | 6813 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6814 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6815 | j = MaxSector; |
4e59ca7d DW |
6816 | rcu_read_lock(); |
6817 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
6818 | if (rdev->raid_disk >= 0 && |
6819 | !test_bit(Faulty, &rdev->flags) && | |
6820 | !test_bit(In_sync, &rdev->flags) && | |
6821 | rdev->recovery_offset < j) | |
6822 | j = rdev->recovery_offset; | |
4e59ca7d | 6823 | rcu_read_unlock(); |
5fd6c1dc | 6824 | } |
1da177e4 | 6825 | |
61df9d91 N |
6826 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6827 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6828 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6829 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6830 | "(but not more than %d KB/sec) for %s.\n", |
6831 | speed_max(mddev), desc); | |
1da177e4 | 6832 | |
eea1bf38 | 6833 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6834 | |
57afd89f | 6835 | io_sectors = 0; |
1da177e4 LT |
6836 | for (m = 0; m < SYNC_MARKS; m++) { |
6837 | mark[m] = jiffies; | |
57afd89f | 6838 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6839 | } |
6840 | last_mark = 0; | |
6841 | mddev->resync_mark = mark[last_mark]; | |
6842 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6843 | ||
6844 | /* | |
6845 | * Tune reconstruction: | |
6846 | */ | |
6847 | window = 32*(PAGE_SIZE/512); | |
6848 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6849 | window/2,(unsigned long long) max_sectors/2); | |
6850 | ||
6851 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6852 | last_check = 0; |
6853 | ||
6854 | if (j>2) { | |
6855 | printk(KERN_INFO | |
61df9d91 N |
6856 | "md: resuming %s of %s from checkpoint.\n", |
6857 | desc, mdname(mddev)); | |
1da177e4 LT |
6858 | mddev->curr_resync = j; |
6859 | } | |
75d3da43 | 6860 | mddev->curr_resync_completed = j; |
1da177e4 LT |
6861 | |
6862 | while (j < max_sectors) { | |
57afd89f | 6863 | sector_t sectors; |
1da177e4 | 6864 | |
57afd89f | 6865 | skipped = 0; |
97e4f42d | 6866 | |
7a91ee1f N |
6867 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6868 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6869 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6870 | > (max_sectors >> 4)) || | |
6871 | (j - mddev->curr_resync_completed)*2 | |
6872 | >= mddev->resync_max - mddev->curr_resync_completed | |
6873 | )) { | |
97e4f42d | 6874 | /* time to update curr_resync_completed */ |
97e4f42d N |
6875 | wait_event(mddev->recovery_wait, |
6876 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 6877 | mddev->curr_resync_completed = j; |
070dc6dd | 6878 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 6879 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6880 | } |
acb180b0 | 6881 | |
e62e58a5 N |
6882 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6883 | /* As this condition is controlled by user-space, | |
6884 | * we can block indefinitely, so use '_interruptible' | |
6885 | * to avoid triggering warnings. | |
6886 | */ | |
6887 | flush_signals(current); /* just in case */ | |
6888 | wait_event_interruptible(mddev->recovery_wait, | |
6889 | mddev->resync_max > j | |
6890 | || kthread_should_stop()); | |
6891 | } | |
acb180b0 N |
6892 | |
6893 | if (kthread_should_stop()) | |
6894 | goto interrupted; | |
6895 | ||
57afd89f | 6896 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6897 | currspeed < speed_min(mddev)); |
57afd89f | 6898 | if (sectors == 0) { |
dfc70645 | 6899 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6900 | goto out; |
6901 | } | |
57afd89f N |
6902 | |
6903 | if (!skipped) { /* actual IO requested */ | |
6904 | io_sectors += sectors; | |
6905 | atomic_add(sectors, &mddev->recovery_active); | |
6906 | } | |
6907 | ||
1da177e4 LT |
6908 | j += sectors; |
6909 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6910 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6911 | if (last_check == 0) |
6912 | /* this is the earliers that rebuilt will be | |
6913 | * visible in /proc/mdstat | |
6914 | */ | |
6915 | md_new_event(mddev); | |
57afd89f N |
6916 | |
6917 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6918 | continue; |
6919 | ||
57afd89f | 6920 | last_check = io_sectors; |
1da177e4 | 6921 | |
dfc70645 | 6922 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6923 | break; |
6924 | ||
6925 | repeat: | |
6926 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6927 | /* step marks */ | |
6928 | int next = (last_mark+1) % SYNC_MARKS; | |
6929 | ||
6930 | mddev->resync_mark = mark[next]; | |
6931 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6932 | mark[next] = jiffies; | |
57afd89f | 6933 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6934 | last_mark = next; |
6935 | } | |
6936 | ||
6937 | ||
c6207277 N |
6938 | if (kthread_should_stop()) |
6939 | goto interrupted; | |
6940 | ||
1da177e4 LT |
6941 | |
6942 | /* | |
6943 | * this loop exits only if either when we are slower than | |
6944 | * the 'hard' speed limit, or the system was IO-idle for | |
6945 | * a jiffy. | |
6946 | * the system might be non-idle CPU-wise, but we only care | |
6947 | * about not overloading the IO subsystem. (things like an | |
6948 | * e2fsck being done on the RAID array should execute fast) | |
6949 | */ | |
1da177e4 LT |
6950 | cond_resched(); |
6951 | ||
57afd89f N |
6952 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6953 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6954 | |
88202a0c N |
6955 | if (currspeed > speed_min(mddev)) { |
6956 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6957 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6958 | msleep(500); |
1da177e4 LT |
6959 | goto repeat; |
6960 | } | |
6961 | } | |
6962 | } | |
61df9d91 | 6963 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6964 | /* |
6965 | * this also signals 'finished resyncing' to md_stop | |
6966 | */ | |
6967 | out: | |
1da177e4 LT |
6968 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
6969 | ||
6970 | /* tell personality that we are finished */ | |
57afd89f | 6971 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6972 | |
dfc70645 | 6973 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6974 | mddev->curr_resync > 2) { |
6975 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6976 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6977 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6978 | printk(KERN_INFO | |
61df9d91 N |
6979 | "md: checkpointing %s of %s.\n", |
6980 | desc, mdname(mddev)); | |
5fd6c1dc N |
6981 | mddev->recovery_cp = mddev->curr_resync; |
6982 | } | |
6983 | } else | |
6984 | mddev->recovery_cp = MaxSector; | |
6985 | } else { | |
6986 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6987 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
6988 | rcu_read_lock(); |
6989 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 6990 | if (rdev->raid_disk >= 0 && |
70fffd0b | 6991 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
6992 | !test_bit(Faulty, &rdev->flags) && |
6993 | !test_bit(In_sync, &rdev->flags) && | |
6994 | rdev->recovery_offset < mddev->curr_resync) | |
6995 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 6996 | rcu_read_unlock(); |
5fd6c1dc | 6997 | } |
1da177e4 | 6998 | } |
17571284 | 6999 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7000 | |
1da177e4 | 7001 | skip: |
c07b70ad N |
7002 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7003 | /* We completed so min/max setting can be forgotten if used. */ | |
7004 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7005 | mddev->resync_min = 0; | |
7006 | mddev->resync_max = MaxSector; | |
7007 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7008 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7009 | mddev->curr_resync = 0; |
7010 | wake_up(&resync_wait); | |
7011 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7012 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
7013 | return; |
7014 | ||
7015 | interrupted: | |
7016 | /* | |
7017 | * got a signal, exit. | |
7018 | */ | |
7019 | printk(KERN_INFO | |
7020 | "md: md_do_sync() got signal ... exiting\n"); | |
7021 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7022 | goto out; | |
7023 | ||
1da177e4 | 7024 | } |
29269553 | 7025 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
7026 | |
7027 | ||
b4c4c7b8 N |
7028 | static int remove_and_add_spares(mddev_t *mddev) |
7029 | { | |
7030 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
7031 | int spares = 0; |
7032 | ||
97e4f42d N |
7033 | mddev->curr_resync_completed = 0; |
7034 | ||
159ec1fc | 7035 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 7036 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 7037 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7038 | (test_bit(Faulty, &rdev->flags) || |
7039 | ! test_bit(In_sync, &rdev->flags)) && | |
7040 | atomic_read(&rdev->nr_pending)==0) { | |
7041 | if (mddev->pers->hot_remove_disk( | |
7042 | mddev, rdev->raid_disk)==0) { | |
7043 | char nm[20]; | |
7044 | sprintf(nm,"rd%d", rdev->raid_disk); | |
7045 | sysfs_remove_link(&mddev->kobj, nm); | |
7046 | rdev->raid_disk = -1; | |
7047 | } | |
7048 | } | |
7049 | ||
a8c42c7f | 7050 | if (mddev->degraded && !mddev->recovery_disabled) { |
159ec1fc | 7051 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7052 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
7053 | !test_bit(In_sync, &rdev->flags) && |
7054 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 7055 | spares++; |
b4c4c7b8 N |
7056 | if (rdev->raid_disk < 0 |
7057 | && !test_bit(Faulty, &rdev->flags)) { | |
7058 | rdev->recovery_offset = 0; | |
199050ea NB |
7059 | if (mddev->pers-> |
7060 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
7061 | char nm[20]; |
7062 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
7063 | if (sysfs_create_link(&mddev->kobj, |
7064 | &rdev->kobj, nm)) | |
00bcb4ac | 7065 | /* failure here is OK */; |
b4c4c7b8 N |
7066 | spares++; |
7067 | md_new_event(mddev); | |
93be75ff | 7068 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
7069 | } else |
7070 | break; | |
7071 | } | |
dfc70645 | 7072 | } |
b4c4c7b8 N |
7073 | } |
7074 | return spares; | |
7075 | } | |
7ebc0be7 N |
7076 | |
7077 | static void reap_sync_thread(mddev_t *mddev) | |
7078 | { | |
7079 | mdk_rdev_t *rdev; | |
7080 | ||
7081 | /* resync has finished, collect result */ | |
7082 | md_unregister_thread(mddev->sync_thread); | |
7083 | mddev->sync_thread = NULL; | |
7084 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7085 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7086 | /* success...*/ | |
7087 | /* activate any spares */ | |
7088 | if (mddev->pers->spare_active(mddev)) | |
7089 | sysfs_notify(&mddev->kobj, NULL, | |
7090 | "degraded"); | |
7091 | } | |
7092 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7093 | mddev->pers->finish_reshape) | |
7094 | mddev->pers->finish_reshape(mddev); | |
7095 | md_update_sb(mddev, 1); | |
7096 | ||
7097 | /* if array is no-longer degraded, then any saved_raid_disk | |
7098 | * information must be scrapped | |
7099 | */ | |
7100 | if (!mddev->degraded) | |
7101 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7102 | rdev->saved_raid_disk = -1; | |
7103 | ||
7104 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7105 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7106 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7107 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7108 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7109 | /* flag recovery needed just to double check */ | |
7110 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7111 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7112 | md_new_event(mddev); | |
7113 | } | |
7114 | ||
1da177e4 LT |
7115 | /* |
7116 | * This routine is regularly called by all per-raid-array threads to | |
7117 | * deal with generic issues like resync and super-block update. | |
7118 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7119 | * need this as they never do any recovery or update the superblock. | |
7120 | * | |
7121 | * It does not do any resync itself, but rather "forks" off other threads | |
7122 | * to do that as needed. | |
7123 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7124 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7125 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7126 | * and wakeups up this thread which will reap the thread and finish up. |
7127 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7128 | * | |
7129 | * The overall approach is: | |
7130 | * 1/ if the superblock needs updating, update it. | |
7131 | * 2/ If a recovery thread is running, don't do anything else. | |
7132 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7133 | * 4/ If there are any faulty devices, remove them. | |
7134 | * 5/ If array is degraded, try to add spares devices | |
7135 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7136 | */ | |
7137 | void md_check_recovery(mddev_t *mddev) | |
7138 | { | |
5f40402d | 7139 | if (mddev->bitmap) |
aa5cbd10 | 7140 | bitmap_daemon_work(mddev); |
1da177e4 LT |
7141 | |
7142 | if (mddev->ro) | |
7143 | return; | |
fca4d848 N |
7144 | |
7145 | if (signal_pending(current)) { | |
31a59e34 | 7146 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7147 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7148 | mdname(mddev)); | |
7149 | mddev->safemode = 2; | |
7150 | } | |
7151 | flush_signals(current); | |
7152 | } | |
7153 | ||
c89a8eee N |
7154 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7155 | return; | |
1da177e4 | 7156 | if ( ! ( |
126925c0 | 7157 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7158 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7159 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7160 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7161 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7162 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7163 | )) |
7164 | return; | |
fca4d848 | 7165 | |
df5b89b3 | 7166 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7167 | int spares = 0; |
fca4d848 | 7168 | |
c89a8eee N |
7169 | if (mddev->ro) { |
7170 | /* Only thing we do on a ro array is remove | |
7171 | * failed devices. | |
7172 | */ | |
a8c42c7f N |
7173 | mdk_rdev_t *rdev; |
7174 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7175 | if (rdev->raid_disk >= 0 && | |
7176 | !test_bit(Blocked, &rdev->flags) && | |
7177 | test_bit(Faulty, &rdev->flags) && | |
7178 | atomic_read(&rdev->nr_pending)==0) { | |
7179 | if (mddev->pers->hot_remove_disk( | |
7180 | mddev, rdev->raid_disk)==0) { | |
7181 | char nm[20]; | |
7182 | sprintf(nm,"rd%d", rdev->raid_disk); | |
7183 | sysfs_remove_link(&mddev->kobj, nm); | |
7184 | rdev->raid_disk = -1; | |
7185 | } | |
7186 | } | |
c89a8eee N |
7187 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7188 | goto unlock; | |
7189 | } | |
7190 | ||
31a59e34 | 7191 | if (!mddev->external) { |
0fd62b86 | 7192 | int did_change = 0; |
31a59e34 N |
7193 | spin_lock_irq(&mddev->write_lock); |
7194 | if (mddev->safemode && | |
7195 | !atomic_read(&mddev->writes_pending) && | |
7196 | !mddev->in_sync && | |
7197 | mddev->recovery_cp == MaxSector) { | |
7198 | mddev->in_sync = 1; | |
0fd62b86 | 7199 | did_change = 1; |
070dc6dd | 7200 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7201 | } |
7202 | if (mddev->safemode == 1) | |
7203 | mddev->safemode = 0; | |
7204 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7205 | if (did_change) |
00bcb4ac | 7206 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7207 | } |
fca4d848 | 7208 | |
850b2b42 N |
7209 | if (mddev->flags) |
7210 | md_update_sb(mddev, 0); | |
06d91a5f | 7211 | |
1da177e4 LT |
7212 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7213 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7214 | /* resync/recovery still happening */ | |
7215 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7216 | goto unlock; | |
7217 | } | |
7218 | if (mddev->sync_thread) { | |
7ebc0be7 | 7219 | reap_sync_thread(mddev); |
1da177e4 LT |
7220 | goto unlock; |
7221 | } | |
72a23c21 NB |
7222 | /* Set RUNNING before clearing NEEDED to avoid |
7223 | * any transients in the value of "sync_action". | |
7224 | */ | |
7225 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7226 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7227 | /* Clear some bits that don't mean anything, but |
7228 | * might be left set | |
7229 | */ | |
24dd469d N |
7230 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7231 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7232 | |
5fd6c1dc N |
7233 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7234 | goto unlock; | |
1da177e4 LT |
7235 | /* no recovery is running. |
7236 | * remove any failed drives, then | |
7237 | * add spares if possible. | |
7238 | * Spare are also removed and re-added, to allow | |
7239 | * the personality to fail the re-add. | |
7240 | */ | |
1da177e4 | 7241 | |
b4c4c7b8 | 7242 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7243 | if (mddev->pers->check_reshape == NULL || |
7244 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7245 | /* Cannot proceed */ |
7246 | goto unlock; | |
7247 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7248 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7249 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7250 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7251 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7252 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7253 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7254 | } else if (mddev->recovery_cp < MaxSector) { |
7255 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7256 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7257 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7258 | /* nothing to be done ... */ | |
1da177e4 | 7259 | goto unlock; |
24dd469d | 7260 | |
1da177e4 | 7261 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7262 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7263 | /* We are adding a device or devices to an array | |
7264 | * which has the bitmap stored on all devices. | |
7265 | * So make sure all bitmap pages get written | |
7266 | */ | |
7267 | bitmap_write_all(mddev->bitmap); | |
7268 | } | |
1da177e4 LT |
7269 | mddev->sync_thread = md_register_thread(md_do_sync, |
7270 | mddev, | |
0da3c619 | 7271 | "resync"); |
1da177e4 LT |
7272 | if (!mddev->sync_thread) { |
7273 | printk(KERN_ERR "%s: could not start resync" | |
7274 | " thread...\n", | |
7275 | mdname(mddev)); | |
7276 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7277 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7278 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7279 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7280 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7281 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7282 | } else |
1da177e4 | 7283 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7284 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7285 | md_new_event(mddev); |
1da177e4 LT |
7286 | } |
7287 | unlock: | |
72a23c21 NB |
7288 | if (!mddev->sync_thread) { |
7289 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7290 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7291 | &mddev->recovery)) | |
0c3573f1 | 7292 | if (mddev->sysfs_action) |
00bcb4ac | 7293 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7294 | } |
1da177e4 LT |
7295 | mddev_unlock(mddev); |
7296 | } | |
7297 | } | |
7298 | ||
6bfe0b49 DW |
7299 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7300 | { | |
00bcb4ac | 7301 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 DW |
7302 | wait_event_timeout(rdev->blocked_wait, |
7303 | !test_bit(Blocked, &rdev->flags), | |
7304 | msecs_to_jiffies(5000)); | |
7305 | rdev_dec_pending(rdev, mddev); | |
7306 | } | |
7307 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7308 | ||
75c96f85 AB |
7309 | static int md_notify_reboot(struct notifier_block *this, |
7310 | unsigned long code, void *x) | |
1da177e4 LT |
7311 | { |
7312 | struct list_head *tmp; | |
7313 | mddev_t *mddev; | |
7314 | ||
7315 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7316 | ||
7317 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7318 | ||
29ac4aa3 | 7319 | for_each_mddev(mddev, tmp) |
c71d4887 | 7320 | if (mddev_trylock(mddev)) { |
2b25000b N |
7321 | /* Force a switch to readonly even array |
7322 | * appears to still be in use. Hence | |
7323 | * the '100'. | |
7324 | */ | |
a4bd82d0 | 7325 | md_set_readonly(mddev, 100); |
c71d4887 NB |
7326 | mddev_unlock(mddev); |
7327 | } | |
1da177e4 LT |
7328 | /* |
7329 | * certain more exotic SCSI devices are known to be | |
7330 | * volatile wrt too early system reboots. While the | |
7331 | * right place to handle this issue is the given | |
7332 | * driver, we do want to have a safe RAID driver ... | |
7333 | */ | |
7334 | mdelay(1000*1); | |
7335 | } | |
7336 | return NOTIFY_DONE; | |
7337 | } | |
7338 | ||
75c96f85 | 7339 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7340 | .notifier_call = md_notify_reboot, |
7341 | .next = NULL, | |
7342 | .priority = INT_MAX, /* before any real devices */ | |
7343 | }; | |
7344 | ||
7345 | static void md_geninit(void) | |
7346 | { | |
1da177e4 LT |
7347 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7348 | ||
c7705f34 | 7349 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7350 | } |
7351 | ||
75c96f85 | 7352 | static int __init md_init(void) |
1da177e4 | 7353 | { |
e804ac78 TH |
7354 | int ret = -ENOMEM; |
7355 | ||
ada609ee | 7356 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
7357 | if (!md_wq) |
7358 | goto err_wq; | |
7359 | ||
7360 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
7361 | if (!md_misc_wq) | |
7362 | goto err_misc_wq; | |
7363 | ||
7364 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
7365 | goto err_md; | |
7366 | ||
7367 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
7368 | goto err_mdp; | |
7369 | mdp_major = ret; | |
7370 | ||
3dbd8c2e | 7371 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7372 | md_probe, NULL, NULL); |
7373 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7374 | md_probe, NULL, NULL); |
7375 | ||
1da177e4 | 7376 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7377 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7378 | |
7379 | md_geninit(); | |
d710e138 | 7380 | return 0; |
1da177e4 | 7381 | |
e804ac78 TH |
7382 | err_mdp: |
7383 | unregister_blkdev(MD_MAJOR, "md"); | |
7384 | err_md: | |
7385 | destroy_workqueue(md_misc_wq); | |
7386 | err_misc_wq: | |
7387 | destroy_workqueue(md_wq); | |
7388 | err_wq: | |
7389 | return ret; | |
7390 | } | |
1da177e4 LT |
7391 | |
7392 | #ifndef MODULE | |
7393 | ||
7394 | /* | |
7395 | * Searches all registered partitions for autorun RAID arrays | |
7396 | * at boot time. | |
7397 | */ | |
4d936ec1 ME |
7398 | |
7399 | static LIST_HEAD(all_detected_devices); | |
7400 | struct detected_devices_node { | |
7401 | struct list_head list; | |
7402 | dev_t dev; | |
7403 | }; | |
1da177e4 LT |
7404 | |
7405 | void md_autodetect_dev(dev_t dev) | |
7406 | { | |
4d936ec1 ME |
7407 | struct detected_devices_node *node_detected_dev; |
7408 | ||
7409 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7410 | if (node_detected_dev) { | |
7411 | node_detected_dev->dev = dev; | |
7412 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7413 | } else { | |
7414 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7415 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7416 | } | |
1da177e4 LT |
7417 | } |
7418 | ||
7419 | ||
7420 | static void autostart_arrays(int part) | |
7421 | { | |
7422 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7423 | struct detected_devices_node *node_detected_dev; |
7424 | dev_t dev; | |
7425 | int i_scanned, i_passed; | |
1da177e4 | 7426 | |
4d936ec1 ME |
7427 | i_scanned = 0; |
7428 | i_passed = 0; | |
1da177e4 | 7429 | |
4d936ec1 | 7430 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7431 | |
4d936ec1 ME |
7432 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7433 | i_scanned++; | |
7434 | node_detected_dev = list_entry(all_detected_devices.next, | |
7435 | struct detected_devices_node, list); | |
7436 | list_del(&node_detected_dev->list); | |
7437 | dev = node_detected_dev->dev; | |
7438 | kfree(node_detected_dev); | |
df968c4e | 7439 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7440 | if (IS_ERR(rdev)) |
7441 | continue; | |
7442 | ||
b2d444d7 | 7443 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7444 | MD_BUG(); |
7445 | continue; | |
7446 | } | |
d0fae18f | 7447 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 7448 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 7449 | i_passed++; |
1da177e4 | 7450 | } |
4d936ec1 ME |
7451 | |
7452 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
7453 | i_scanned, i_passed); | |
1da177e4 LT |
7454 | |
7455 | autorun_devices(part); | |
7456 | } | |
7457 | ||
fdee8ae4 | 7458 | #endif /* !MODULE */ |
1da177e4 LT |
7459 | |
7460 | static __exit void md_exit(void) | |
7461 | { | |
7462 | mddev_t *mddev; | |
7463 | struct list_head *tmp; | |
8ab5e4c1 | 7464 | |
3dbd8c2e | 7465 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 7466 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 7467 | |
3dbd8c2e | 7468 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
7469 | unregister_blkdev(mdp_major, "mdp"); |
7470 | unregister_reboot_notifier(&md_notifier); | |
7471 | unregister_sysctl_table(raid_table_header); | |
7472 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 7473 | for_each_mddev(mddev, tmp) { |
1da177e4 | 7474 | export_array(mddev); |
d3374825 | 7475 | mddev->hold_active = 0; |
1da177e4 | 7476 | } |
e804ac78 TH |
7477 | destroy_workqueue(md_misc_wq); |
7478 | destroy_workqueue(md_wq); | |
1da177e4 LT |
7479 | } |
7480 | ||
685784aa | 7481 | subsys_initcall(md_init); |
1da177e4 LT |
7482 | module_exit(md_exit) |
7483 | ||
f91de92e N |
7484 | static int get_ro(char *buffer, struct kernel_param *kp) |
7485 | { | |
7486 | return sprintf(buffer, "%d", start_readonly); | |
7487 | } | |
7488 | static int set_ro(const char *val, struct kernel_param *kp) | |
7489 | { | |
7490 | char *e; | |
7491 | int num = simple_strtoul(val, &e, 10); | |
7492 | if (*val && (*e == '\0' || *e == '\n')) { | |
7493 | start_readonly = num; | |
4dbcdc75 | 7494 | return 0; |
f91de92e N |
7495 | } |
7496 | return -EINVAL; | |
7497 | } | |
7498 | ||
80ca3a44 N |
7499 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
7500 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 7501 | |
efeb53c0 | 7502 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 7503 | |
1da177e4 LT |
7504 | EXPORT_SYMBOL(register_md_personality); |
7505 | EXPORT_SYMBOL(unregister_md_personality); | |
7506 | EXPORT_SYMBOL(md_error); | |
7507 | EXPORT_SYMBOL(md_done_sync); | |
7508 | EXPORT_SYMBOL(md_write_start); | |
7509 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
7510 | EXPORT_SYMBOL(md_register_thread); |
7511 | EXPORT_SYMBOL(md_unregister_thread); | |
7512 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
7513 | EXPORT_SYMBOL(md_check_recovery); |
7514 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7515 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 7516 | MODULE_ALIAS("md"); |
72008652 | 7517 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |