blob: fec4abcb9bb4d443e086af8198e9b26de865ee81 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
NeilBrown32a76272005-06-21 17:17:14 -070022 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 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
NeilBrowna6fb0932005-09-09 16:23:56 -070035#include <linux/kthread.h>
NeilBrownbff61972009-03-31 14:33:13 +110036#include <linux/blkdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/sysctl.h>
NeilBrownbff61972009-03-31 14:33:13 +110038#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/buffer_head.h> /* for invalidate_bdev */
NeilBrownd7603b72006-01-06 00:20:30 -080040#include <linux/poll.h>
NeilBrown16f17b32006-06-26 00:27:37 -070041#include <linux/ctype.h>
André Goddard Rosae7d28602009-12-14 18:01:06 -080042#include <linux/string.h>
NeilBrownfb4d8c72008-10-13 11:55:12 +110043#include <linux/hdreg.h>
44#include <linux/proc_fs.h>
45#include <linux/random.h>
46#include <linux/reboot.h>
NeilBrown32a76272005-06-21 17:17:14 -070047#include <linux/file.h>
Arnd Bergmannaa98aa32009-12-14 12:50:05 +110048#include <linux/compat.h>
Stephen Rothwell25570722008-10-15 09:09:21 +110049#include <linux/delay.h>
NeilBrownbff61972009-03-31 14:33:13 +110050#include <linux/raid/md_p.h>
51#include <linux/raid/md_u.h>
NeilBrown43b2e5d2009-03-31 14:33:13 +110052#include "md.h"
Christoph Hellwigef740c32009-03-31 14:27:03 +110053#include "bitmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55#define DEBUG 0
56#define dprintk(x...) ((void)(DEBUG && printk(x)))
57
58
59#ifndef MODULE
NeilBrownd710e132008-10-13 11:55:12 +110060static void autostart_arrays(int part);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#endif
62
NeilBrown2604b702006-01-06 00:20:36 -080063static LIST_HEAD(pers_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064static DEFINE_SPINLOCK(pers_lock);
65
Adrian Bunk5e563412006-06-26 00:27:42 -070066static void md_print_devices(void);
67
Bernd Schubert90b08712008-05-23 13:04:38 -070068static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
69
Adrian Bunk5e563412006-06-26 00:27:42 -070070#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072/*
Robert Becker1e509152009-12-14 12:49:58 +110073 * Default number of read corrections we'll attempt on an rdev
74 * before ejecting it from the array. We divide the read error
75 * count by 2 for every hour elapsed between read errors.
76 */
77#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
78/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
80 * is 1000 KB/sec, so the extra system load does not show up that much.
81 * Increase it if you want to have more _guaranteed_ speed. Note that
Adrian Bunk338cec32005-09-10 00:26:54 -070082 * the RAID driver will use the maximum available bandwidth if the IO
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 * subsystem is idle. There is also an 'absolute maximum' reconstruction
84 * speed limit - in case reconstruction slows down your system despite
85 * idle IO detection.
86 *
87 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
NeilBrown88202a02006-01-06 00:21:36 -080088 * or /sys/block/mdX/md/sync_speed_{min,max}
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 */
90
91static int sysctl_speed_limit_min = 1000;
92static int sysctl_speed_limit_max = 200000;
NeilBrown88202a02006-01-06 00:21:36 -080093static inline int speed_min(mddev_t *mddev)
94{
95 return mddev->sync_speed_min ?
96 mddev->sync_speed_min : sysctl_speed_limit_min;
97}
98
99static inline int speed_max(mddev_t *mddev)
100{
101 return mddev->sync_speed_max ?
102 mddev->sync_speed_max : sysctl_speed_limit_max;
103}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105static struct ctl_table_header *raid_table_header;
106
107static ctl_table raid_table[] = {
108 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 .procname = "speed_limit_min",
110 .data = &sysctl_speed_limit_min,
111 .maxlen = sizeof(int),
NeilBrown80ca3a42006-07-10 04:44:18 -0700112 .mode = S_IRUGO|S_IWUSR,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800113 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 },
115 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 .procname = "speed_limit_max",
117 .data = &sysctl_speed_limit_max,
118 .maxlen = sizeof(int),
NeilBrown80ca3a42006-07-10 04:44:18 -0700119 .mode = S_IRUGO|S_IWUSR,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800120 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 },
Eric W. Biederman894d2492009-11-05 14:34:02 -0800122 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123};
124
125static ctl_table raid_dir_table[] = {
126 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 .procname = "raid",
128 .maxlen = 0,
NeilBrown80ca3a42006-07-10 04:44:18 -0700129 .mode = S_IRUGO|S_IXUGO,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 .child = raid_table,
131 },
Eric W. Biederman894d2492009-11-05 14:34:02 -0800132 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133};
134
135static ctl_table raid_root_table[] = {
136 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 .procname = "dev",
138 .maxlen = 0,
139 .mode = 0555,
140 .child = raid_dir_table,
141 },
Eric W. Biederman894d2492009-11-05 14:34:02 -0800142 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143};
144
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700145static const struct block_device_operations md_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
NeilBrownf91de922005-11-08 21:39:36 -0800147static int start_readonly;
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149/*
NeilBrownd7603b72006-01-06 00:20:30 -0800150 * We have a system wide 'event count' that is incremented
151 * on any 'interesting' event, and readers of /proc/mdstat
152 * can use 'poll' or 'select' to find out when the event
153 * count increases.
154 *
155 * Events are:
156 * start array, stop array, error, add device, remove device,
157 * start build, activate spare
158 */
NeilBrown2989ddb2006-01-06 00:20:43 -0800159static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
NeilBrownd7603b72006-01-06 00:20:30 -0800160static atomic_t md_event_count;
NeilBrown29269552006-03-27 01:18:10 -0800161void md_new_event(mddev_t *mddev)
NeilBrownd7603b72006-01-06 00:20:30 -0800162{
163 atomic_inc(&md_event_count);
164 wake_up(&md_event_waiters);
165}
NeilBrown29269552006-03-27 01:18:10 -0800166EXPORT_SYMBOL_GPL(md_new_event);
NeilBrownd7603b72006-01-06 00:20:30 -0800167
NeilBrownc331eb02006-05-30 21:27:13 -0700168/* Alternate version that can be called from interrupts
169 * when calling sysfs_notify isn't needed.
170 */
Adrian Bunk05381952006-06-26 00:28:01 -0700171static void md_new_event_inintr(mddev_t *mddev)
NeilBrownc331eb02006-05-30 21:27:13 -0700172{
173 atomic_inc(&md_event_count);
174 wake_up(&md_event_waiters);
175}
176
NeilBrownd7603b72006-01-06 00:20:30 -0800177/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 * Enables to iterate over all existing md arrays
179 * all_mddevs_lock protects this list.
180 */
181static LIST_HEAD(all_mddevs);
182static DEFINE_SPINLOCK(all_mddevs_lock);
183
184
185/*
186 * iterates through all used mddevs in the system.
187 * We take care to grab the all_mddevs_lock whenever navigating
188 * the list, and to always hold a refcount when unlocked.
189 * Any code which breaks out of this loop while own
190 * a reference to the current mddev and must mddev_put it.
191 */
NeilBrown29ac4aa2008-02-06 01:39:58 -0800192#define for_each_mddev(mddev,tmp) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 \
194 for (({ spin_lock(&all_mddevs_lock); \
195 tmp = all_mddevs.next; \
196 mddev = NULL;}); \
197 ({ if (tmp != &all_mddevs) \
198 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
199 spin_unlock(&all_mddevs_lock); \
200 if (mddev) mddev_put(mddev); \
201 mddev = list_entry(tmp, mddev_t, all_mddevs); \
202 tmp != &all_mddevs;}); \
203 ({ spin_lock(&all_mddevs_lock); \
204 tmp = tmp->next;}) \
205 )
206
207
NeilBrown409c57f2009-03-31 14:39:39 +1100208/* Rather than calling directly into the personality make_request function,
209 * IO requests come here first so that we can check if the device is
210 * being suspended pending a reconfiguration.
211 * We hold a refcount over the call to ->make_request. By the time that
212 * call has finished, the bio has been linked into some internal structure
213 * and so is visible to ->quiesce(), so we don't need the refcount any more.
214 */
215static int md_make_request(struct request_queue *q, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
NeilBrown49077322010-03-25 16:20:56 +1100217 const int rw = bio_data_dir(bio);
NeilBrown409c57f2009-03-31 14:39:39 +1100218 mddev_t *mddev = q->queuedata;
219 int rv;
NeilBrown49077322010-03-25 16:20:56 +1100220 int cpu;
221
NeilBrown409c57f2009-03-31 14:39:39 +1100222 if (mddev == NULL || mddev->pers == NULL) {
223 bio_io_error(bio);
224 return 0;
225 }
226 rcu_read_lock();
NeilBrowna2826aa2009-12-14 12:49:49 +1100227 if (mddev->suspended || mddev->barrier) {
NeilBrown409c57f2009-03-31 14:39:39 +1100228 DEFINE_WAIT(__wait);
229 for (;;) {
230 prepare_to_wait(&mddev->sb_wait, &__wait,
231 TASK_UNINTERRUPTIBLE);
NeilBrowna2826aa2009-12-14 12:49:49 +1100232 if (!mddev->suspended && !mddev->barrier)
NeilBrown409c57f2009-03-31 14:39:39 +1100233 break;
234 rcu_read_unlock();
235 schedule();
236 rcu_read_lock();
237 }
238 finish_wait(&mddev->sb_wait, &__wait);
239 }
240 atomic_inc(&mddev->active_io);
241 rcu_read_unlock();
NeilBrown49077322010-03-25 16:20:56 +1100242
NeilBrown21a52c62010-04-01 15:02:13 +1100243 rv = mddev->pers->make_request(mddev, bio);
NeilBrown49077322010-03-25 16:20:56 +1100244
245 cpu = part_stat_lock();
246 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
247 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
248 bio_sectors(bio));
249 part_stat_unlock();
250
NeilBrown409c57f2009-03-31 14:39:39 +1100251 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
252 wake_up(&mddev->sb_wait);
253
254 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255}
256
NeilBrown9e35b992010-04-06 14:23:02 +1000257/* mddev_suspend makes sure no new requests are submitted
258 * to the device, and that any requests that have been submitted
259 * are completely handled.
260 * Once ->stop is called and completes, the module will be completely
261 * unused.
262 */
NeilBrown409c57f2009-03-31 14:39:39 +1100263static void mddev_suspend(mddev_t *mddev)
264{
265 BUG_ON(mddev->suspended);
266 mddev->suspended = 1;
267 synchronize_rcu();
268 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
269 mddev->pers->quiesce(mddev, 1);
NeilBrown409c57f2009-03-31 14:39:39 +1100270}
271
272static void mddev_resume(mddev_t *mddev)
273{
274 mddev->suspended = 0;
275 wake_up(&mddev->sb_wait);
276 mddev->pers->quiesce(mddev, 0);
277}
278
NeilBrown3fa841d2009-09-23 18:10:29 +1000279int mddev_congested(mddev_t *mddev, int bits)
280{
NeilBrowna2826aa2009-12-14 12:49:49 +1100281 if (mddev->barrier)
282 return 1;
NeilBrown3fa841d2009-09-23 18:10:29 +1000283 return mddev->suspended;
284}
285EXPORT_SYMBOL(mddev_congested);
286
NeilBrowna2826aa2009-12-14 12:49:49 +1100287/*
288 * Generic barrier handling for md
289 */
290
291#define POST_REQUEST_BARRIER ((void*)1)
292
293static void md_end_barrier(struct bio *bio, int err)
294{
295 mdk_rdev_t *rdev = bio->bi_private;
296 mddev_t *mddev = rdev->mddev;
297 if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER)
298 set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags);
299
300 rdev_dec_pending(rdev, mddev);
301
302 if (atomic_dec_and_test(&mddev->flush_pending)) {
303 if (mddev->barrier == POST_REQUEST_BARRIER) {
304 /* This was a post-request barrier */
305 mddev->barrier = NULL;
306 wake_up(&mddev->sb_wait);
307 } else
308 /* The pre-request barrier has finished */
309 schedule_work(&mddev->barrier_work);
310 }
311 bio_put(bio);
312}
313
314static void submit_barriers(mddev_t *mddev)
315{
316 mdk_rdev_t *rdev;
317
318 rcu_read_lock();
319 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
320 if (rdev->raid_disk >= 0 &&
321 !test_bit(Faulty, &rdev->flags)) {
322 /* Take two references, one is dropped
323 * when request finishes, one after
324 * we reclaim rcu_read_lock
325 */
326 struct bio *bi;
327 atomic_inc(&rdev->nr_pending);
328 atomic_inc(&rdev->nr_pending);
329 rcu_read_unlock();
330 bi = bio_alloc(GFP_KERNEL, 0);
331 bi->bi_end_io = md_end_barrier;
332 bi->bi_private = rdev;
333 bi->bi_bdev = rdev->bdev;
334 atomic_inc(&mddev->flush_pending);
335 submit_bio(WRITE_BARRIER, bi);
336 rcu_read_lock();
337 rdev_dec_pending(rdev, mddev);
338 }
339 rcu_read_unlock();
340}
341
342static void md_submit_barrier(struct work_struct *ws)
343{
344 mddev_t *mddev = container_of(ws, mddev_t, barrier_work);
345 struct bio *bio = mddev->barrier;
346
347 atomic_set(&mddev->flush_pending, 1);
348
349 if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
350 bio_endio(bio, -EOPNOTSUPP);
351 else if (bio->bi_size == 0)
352 /* an empty barrier - all done */
353 bio_endio(bio, 0);
354 else {
355 bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
NeilBrown21a52c62010-04-01 15:02:13 +1100356 if (mddev->pers->make_request(mddev, bio))
NeilBrowna2826aa2009-12-14 12:49:49 +1100357 generic_make_request(bio);
358 mddev->barrier = POST_REQUEST_BARRIER;
359 submit_barriers(mddev);
360 }
361 if (atomic_dec_and_test(&mddev->flush_pending)) {
362 mddev->barrier = NULL;
363 wake_up(&mddev->sb_wait);
364 }
365}
366
367void md_barrier_request(mddev_t *mddev, struct bio *bio)
368{
369 spin_lock_irq(&mddev->write_lock);
370 wait_event_lock_irq(mddev->sb_wait,
371 !mddev->barrier,
372 mddev->write_lock, /*nothing*/);
373 mddev->barrier = bio;
374 spin_unlock_irq(&mddev->write_lock);
375
376 atomic_set(&mddev->flush_pending, 1);
377 INIT_WORK(&mddev->barrier_work, md_submit_barrier);
378
379 submit_barriers(mddev);
380
381 if (atomic_dec_and_test(&mddev->flush_pending))
382 schedule_work(&mddev->barrier_work);
383}
384EXPORT_SYMBOL(md_barrier_request);
NeilBrown409c57f2009-03-31 14:39:39 +1100385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386static inline mddev_t *mddev_get(mddev_t *mddev)
387{
388 atomic_inc(&mddev->active);
389 return mddev;
390}
391
Dan Williams5fd3a172009-03-04 00:57:25 -0700392static void mddev_delayed_delete(struct work_struct *ws);
NeilBrownd3374822009-01-09 08:31:10 +1100393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394static void mddev_put(mddev_t *mddev)
395{
396 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
397 return;
NeilBrownd3374822009-01-09 08:31:10 +1100398 if (!mddev->raid_disks && list_empty(&mddev->disks) &&
NeilBrowncbd19982009-12-30 12:08:49 +1100399 mddev->ctime == 0 && !mddev->hold_active) {
400 /* Array is not configured at all, and not held active,
401 * so destroy it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 list_del(&mddev->all_mddevs);
NeilBrownd3374822009-01-09 08:31:10 +1100403 if (mddev->gendisk) {
404 /* we did a probe so need to clean up.
405 * Call schedule_work inside the spinlock
406 * so that flush_scheduled_work() after
407 * mddev_find will succeed in waiting for the
408 * work to be done.
409 */
410 INIT_WORK(&mddev->del_work, mddev_delayed_delete);
411 schedule_work(&mddev->del_work);
412 } else
413 kfree(mddev);
414 }
415 spin_unlock(&all_mddevs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416}
417
NeilBrownfafd7fb2010-04-01 15:55:30 +1100418static void mddev_init(mddev_t *mddev)
419{
420 mutex_init(&mddev->open_mutex);
421 mutex_init(&mddev->reconfig_mutex);
422 mutex_init(&mddev->bitmap_info.mutex);
423 INIT_LIST_HEAD(&mddev->disks);
424 INIT_LIST_HEAD(&mddev->all_mddevs);
425 init_timer(&mddev->safemode_timer);
426 atomic_set(&mddev->active, 1);
427 atomic_set(&mddev->openers, 0);
428 atomic_set(&mddev->active_io, 0);
429 spin_lock_init(&mddev->write_lock);
430 atomic_set(&mddev->flush_pending, 0);
431 init_waitqueue_head(&mddev->sb_wait);
432 init_waitqueue_head(&mddev->recovery_wait);
433 mddev->reshape_position = MaxSector;
434 mddev->resync_min = 0;
435 mddev->resync_max = MaxSector;
436 mddev->level = LEVEL_NONE;
437}
438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439static mddev_t * mddev_find(dev_t unit)
440{
441 mddev_t *mddev, *new = NULL;
442
443 retry:
444 spin_lock(&all_mddevs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
NeilBrownefeb53c2009-01-09 08:31:10 +1100446 if (unit) {
447 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
448 if (mddev->unit == unit) {
449 mddev_get(mddev);
450 spin_unlock(&all_mddevs_lock);
451 kfree(new);
452 return mddev;
453 }
454
455 if (new) {
456 list_add(&new->all_mddevs, &all_mddevs);
457 spin_unlock(&all_mddevs_lock);
458 new->hold_active = UNTIL_IOCTL;
459 return new;
460 }
461 } else if (new) {
462 /* find an unused unit number */
463 static int next_minor = 512;
464 int start = next_minor;
465 int is_free = 0;
466 int dev = 0;
467 while (!is_free) {
468 dev = MKDEV(MD_MAJOR, next_minor);
469 next_minor++;
470 if (next_minor > MINORMASK)
471 next_minor = 0;
472 if (next_minor == start) {
473 /* Oh dear, all in use. */
474 spin_unlock(&all_mddevs_lock);
475 kfree(new);
476 return NULL;
477 }
478
479 is_free = 1;
480 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
481 if (mddev->unit == dev) {
482 is_free = 0;
483 break;
484 }
485 }
486 new->unit = dev;
487 new->md_minor = MINOR(dev);
488 new->hold_active = UNTIL_STOP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 list_add(&new->all_mddevs, &all_mddevs);
490 spin_unlock(&all_mddevs_lock);
491 return new;
492 }
493 spin_unlock(&all_mddevs_lock);
494
NeilBrown9ffae0c2006-01-06 00:20:32 -0800495 new = kzalloc(sizeof(*new), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (!new)
497 return NULL;
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 new->unit = unit;
500 if (MAJOR(unit) == MD_MAJOR)
501 new->md_minor = MINOR(unit);
502 else
503 new->md_minor = MINOR(unit) >> MdpMinorShift;
504
NeilBrownfafd7fb2010-04-01 15:55:30 +1100505 mddev_init(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 goto retry;
508}
509
510static inline int mddev_lock(mddev_t * mddev)
511{
NeilBrowndf5b89b2006-03-27 01:18:20 -0800512 return mutex_lock_interruptible(&mddev->reconfig_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513}
514
Dan Williamsb522adc2009-03-31 15:00:31 +1100515static inline int mddev_is_locked(mddev_t *mddev)
516{
517 return mutex_is_locked(&mddev->reconfig_mutex);
518}
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520static inline int mddev_trylock(mddev_t * mddev)
521{
NeilBrowndf5b89b2006-03-27 01:18:20 -0800522 return mutex_trylock(&mddev->reconfig_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
NeilBrownb6eb1272010-04-15 10:13:47 +1000525static struct attribute_group md_redundancy_group;
526
NeilBrowna64c8762010-04-14 17:15:37 +1000527static void mddev_unlock(mddev_t * mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
NeilBrowna64c8762010-04-14 17:15:37 +1000529 if (mddev->to_remove) {
NeilBrownb6eb1272010-04-15 10:13:47 +1000530 /* These cannot be removed under reconfig_mutex as
531 * an access to the files will try to take reconfig_mutex
532 * while holding the file unremovable, which leads to
533 * a deadlock.
534 * So hold open_mutex instead - we are allowed to take
535 * it while holding reconfig_mutex, and md_run can
536 * use it to wait for the remove to complete.
537 */
NeilBrowna64c8762010-04-14 17:15:37 +1000538 struct attribute_group *to_remove = mddev->to_remove;
539 mddev->to_remove = NULL;
NeilBrownb6eb1272010-04-15 10:13:47 +1000540 mutex_lock(&mddev->open_mutex);
541 mutex_unlock(&mddev->reconfig_mutex);
542
NeilBrowna64c8762010-04-14 17:15:37 +1000543 if (to_remove != &md_redundancy_group)
544 sysfs_remove_group(&mddev->kobj, to_remove);
545 if (mddev->pers == NULL ||
546 mddev->pers->sync_request == NULL) {
547 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
548 if (mddev->sysfs_action)
549 sysfs_put(mddev->sysfs_action);
550 mddev->sysfs_action = NULL;
551 }
NeilBrownb6eb1272010-04-15 10:13:47 +1000552 mutex_unlock(&mddev->open_mutex);
553 } else
554 mutex_unlock(&mddev->reconfig_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
NeilBrown005eca52005-08-22 13:11:08 -0700556 md_wakeup_thread(mddev->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
NeilBrown2989ddb2006-01-06 00:20:43 -0800559static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560{
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100561 mdk_rdev_t *rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100563 list_for_each_entry(rdev, &mddev->disks, same_set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 if (rdev->desc_nr == nr)
565 return rdev;
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 return NULL;
568}
569
570static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
571{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 mdk_rdev_t *rdev;
573
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100574 list_for_each_entry(rdev, &mddev->disks, same_set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 if (rdev->bdev->bd_dev == dev)
576 return rdev;
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100577
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 return NULL;
579}
580
NeilBrownd9d166c2006-01-06 00:20:51 -0800581static struct mdk_personality *find_pers(int level, char *clevel)
NeilBrown2604b702006-01-06 00:20:36 -0800582{
583 struct mdk_personality *pers;
NeilBrownd9d166c2006-01-06 00:20:51 -0800584 list_for_each_entry(pers, &pers_list, list) {
585 if (level != LEVEL_NONE && pers->level == level)
NeilBrown2604b702006-01-06 00:20:36 -0800586 return pers;
NeilBrownd9d166c2006-01-06 00:20:51 -0800587 if (strcmp(pers->name, clevel)==0)
588 return pers;
589 }
NeilBrown2604b702006-01-06 00:20:36 -0800590 return NULL;
591}
592
Andre Nollb73df2d2008-07-11 22:02:23 +1000593/* return the offset of the super block in 512byte sectors */
Jesper Juhl77933d72005-07-27 11:46:09 -0700594static inline sector_t calc_dev_sboffset(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
Andre Nollb73df2d2008-07-11 22:02:23 +1000596 sector_t num_sectors = bdev->bd_inode->i_size / 512;
597 return MD_NEW_SIZE_SECTORS(num_sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598}
599
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600static int alloc_disk_sb(mdk_rdev_t * rdev)
601{
602 if (rdev->sb_page)
603 MD_BUG();
604
605 rdev->sb_page = alloc_page(GFP_KERNEL);
606 if (!rdev->sb_page) {
607 printk(KERN_ALERT "md: out of memory.\n");
Andre Nollebc24332008-07-11 22:02:20 +1000608 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 }
610
611 return 0;
612}
613
614static void free_disk_sb(mdk_rdev_t * rdev)
615{
616 if (rdev->sb_page) {
NeilBrown2d1f3b52006-01-06 00:20:31 -0800617 put_page(rdev->sb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 rdev->sb_loaded = 0;
619 rdev->sb_page = NULL;
Andre Noll0f420352008-07-11 22:02:23 +1000620 rdev->sb_start = 0;
Andre Nolldd8ac332009-03-31 14:33:13 +1100621 rdev->sectors = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 }
623}
624
625
NeilBrown6712ecf2007-09-27 12:47:43 +0200626static void super_written(struct bio *bio, int error)
NeilBrown7bfa19f2005-06-21 17:17:28 -0700627{
628 mdk_rdev_t *rdev = bio->bi_private;
NeilBrowna9701a32005-11-08 21:39:34 -0800629 mddev_t *mddev = rdev->mddev;
NeilBrown7bfa19f2005-06-21 17:17:28 -0700630
NeilBrown3a0f5bb2006-10-03 01:16:03 -0700631 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
632 printk("md: super_written gets error=%d, uptodate=%d\n",
633 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
634 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
NeilBrowna9701a32005-11-08 21:39:34 -0800635 md_error(mddev, rdev);
NeilBrown3a0f5bb2006-10-03 01:16:03 -0700636 }
NeilBrown7bfa19f2005-06-21 17:17:28 -0700637
NeilBrowna9701a32005-11-08 21:39:34 -0800638 if (atomic_dec_and_test(&mddev->pending_writes))
639 wake_up(&mddev->sb_wait);
Neil Brownf8b58ed2005-06-27 22:29:34 -0700640 bio_put(bio);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700641}
642
NeilBrown6712ecf2007-09-27 12:47:43 +0200643static void super_written_barrier(struct bio *bio, int error)
NeilBrowna9701a32005-11-08 21:39:34 -0800644{
645 struct bio *bio2 = bio->bi_private;
646 mdk_rdev_t *rdev = bio2->bi_private;
647 mddev_t *mddev = rdev->mddev;
NeilBrowna9701a32005-11-08 21:39:34 -0800648
649 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
650 error == -EOPNOTSUPP) {
651 unsigned long flags;
652 /* barriers don't appear to be supported :-( */
653 set_bit(BarriersNotsupp, &rdev->flags);
654 mddev->barriers_work = 0;
655 spin_lock_irqsave(&mddev->write_lock, flags);
656 bio2->bi_next = mddev->biolist;
657 mddev->biolist = bio2;
658 spin_unlock_irqrestore(&mddev->write_lock, flags);
659 wake_up(&mddev->sb_wait);
660 bio_put(bio);
NeilBrown6712ecf2007-09-27 12:47:43 +0200661 } else {
662 bio_put(bio2);
663 bio->bi_private = rdev;
664 super_written(bio, error);
NeilBrowna9701a32005-11-08 21:39:34 -0800665 }
NeilBrowna9701a32005-11-08 21:39:34 -0800666}
667
NeilBrown7bfa19f2005-06-21 17:17:28 -0700668void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
669 sector_t sector, int size, struct page *page)
670{
671 /* write first size bytes of page to sector of rdev
672 * Increment mddev->pending_writes before returning
673 * and decrement it on completion, waking up sb_wait
674 * if zero is reached.
675 * If an error occurred, call md_error
NeilBrowna9701a32005-11-08 21:39:34 -0800676 *
677 * As we might need to resubmit the request if BIO_RW_BARRIER
678 * causes ENOTSUPP, we allocate a spare bio...
NeilBrown7bfa19f2005-06-21 17:17:28 -0700679 */
680 struct bio *bio = bio_alloc(GFP_NOIO, 1);
Jens Axboe93dbb392009-02-16 10:25:40 +0100681 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700682
683 bio->bi_bdev = rdev->bdev;
684 bio->bi_sector = sector;
685 bio_add_page(bio, page, size, 0);
686 bio->bi_private = rdev;
687 bio->bi_end_io = super_written;
NeilBrowna9701a32005-11-08 21:39:34 -0800688 bio->bi_rw = rw;
689
NeilBrown7bfa19f2005-06-21 17:17:28 -0700690 atomic_inc(&mddev->pending_writes);
NeilBrowna9701a32005-11-08 21:39:34 -0800691 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
692 struct bio *rbio;
693 rw |= (1<<BIO_RW_BARRIER);
694 rbio = bio_clone(bio, GFP_NOIO);
695 rbio->bi_private = bio;
696 rbio->bi_end_io = super_written_barrier;
697 submit_bio(rw, rbio);
698 } else
699 submit_bio(rw, bio);
700}
701
702void md_super_wait(mddev_t *mddev)
703{
704 /* wait for all superblock writes that were scheduled to complete.
705 * if any had to be retried (due to BARRIER problems), retry them
706 */
707 DEFINE_WAIT(wq);
708 for(;;) {
709 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
710 if (atomic_read(&mddev->pending_writes)==0)
711 break;
712 while (mddev->biolist) {
713 struct bio *bio;
714 spin_lock_irq(&mddev->write_lock);
715 bio = mddev->biolist;
716 mddev->biolist = bio->bi_next ;
717 bio->bi_next = NULL;
718 spin_unlock_irq(&mddev->write_lock);
719 submit_bio(bio->bi_rw, bio);
720 }
721 schedule();
722 }
723 finish_wait(&mddev->sb_wait, &wq);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700724}
725
NeilBrown6712ecf2007-09-27 12:47:43 +0200726static void bi_complete(struct bio *bio, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 complete((struct completion*)bio->bi_private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729}
730
NeilBrowna654b9d82005-06-21 17:17:27 -0700731int sync_page_io(struct block_device *bdev, sector_t sector, int size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 struct page *page, int rw)
733{
Neil Brownbaaa2c52005-04-16 15:23:54 -0700734 struct bio *bio = bio_alloc(GFP_NOIO, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 struct completion event;
736 int ret;
737
Jens Axboe93dbb392009-02-16 10:25:40 +0100738 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
740 bio->bi_bdev = bdev;
741 bio->bi_sector = sector;
742 bio_add_page(bio, page, size, 0);
743 init_completion(&event);
744 bio->bi_private = &event;
745 bio->bi_end_io = bi_complete;
746 submit_bio(rw, bio);
747 wait_for_completion(&event);
748
749 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
750 bio_put(bio);
751 return ret;
752}
NeilBrowna8745db2006-01-06 00:20:34 -0800753EXPORT_SYMBOL_GPL(sync_page_io);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
NeilBrown0002b272005-09-09 16:23:53 -0700755static int read_disk_sb(mdk_rdev_t * rdev, int size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756{
757 char b[BDEVNAME_SIZE];
758 if (!rdev->sb_page) {
759 MD_BUG();
760 return -EINVAL;
761 }
762 if (rdev->sb_loaded)
763 return 0;
764
765
Andre Noll0f420352008-07-11 22:02:23 +1000766 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 goto fail;
768 rdev->sb_loaded = 1;
769 return 0;
770
771fail:
772 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
773 bdevname(rdev->bdev,b));
774 return -EINVAL;
775}
776
777static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
778{
Andre Noll05710462008-07-11 22:02:20 +1000779 return sb1->set_uuid0 == sb2->set_uuid0 &&
780 sb1->set_uuid1 == sb2->set_uuid1 &&
781 sb1->set_uuid2 == sb2->set_uuid2 &&
782 sb1->set_uuid3 == sb2->set_uuid3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783}
784
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
786{
787 int ret;
788 mdp_super_t *tmp1, *tmp2;
789
790 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
791 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
792
793 if (!tmp1 || !tmp2) {
794 ret = 0;
Andre Noll35020f12008-03-23 15:10:33 +0100795 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 goto abort;
797 }
798
799 *tmp1 = *sb1;
800 *tmp2 = *sb2;
801
802 /*
803 * nr_disks is not constant
804 */
805 tmp1->nr_disks = 0;
806 tmp2->nr_disks = 0;
807
Andre Nollce0c8e02008-07-11 22:02:20 +1000808 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809abort:
Jesper Juhl990a8ba2005-06-21 17:17:30 -0700810 kfree(tmp1);
811 kfree(tmp2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 return ret;
813}
814
NeilBrown4d167f02007-05-09 02:35:37 -0700815
816static u32 md_csum_fold(u32 csum)
817{
818 csum = (csum & 0xffff) + (csum >> 16);
819 return (csum & 0xffff) + (csum >> 16);
820}
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822static unsigned int calc_sb_csum(mdp_super_t * sb)
823{
NeilBrown4d167f02007-05-09 02:35:37 -0700824 u64 newcsum = 0;
825 u32 *sb32 = (u32*)sb;
826 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 unsigned int disk_csum, csum;
828
829 disk_csum = sb->sb_csum;
830 sb->sb_csum = 0;
NeilBrown4d167f02007-05-09 02:35:37 -0700831
832 for (i = 0; i < MD_SB_BYTES/4 ; i++)
833 newcsum += sb32[i];
834 csum = (newcsum & 0xffffffff) + (newcsum>>32);
835
836
837#ifdef CONFIG_ALPHA
838 /* This used to use csum_partial, which was wrong for several
839 * reasons including that different results are returned on
840 * different architectures. It isn't critical that we get exactly
841 * the same return value as before (we always csum_fold before
842 * testing, and that removes any differences). However as we
843 * know that csum_partial always returned a 16bit value on
844 * alphas, do a fold to maximise conformity to previous behaviour.
845 */
846 sb->sb_csum = md_csum_fold(disk_csum);
847#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 sb->sb_csum = disk_csum;
NeilBrown4d167f02007-05-09 02:35:37 -0700849#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 return csum;
851}
852
853
854/*
855 * Handle superblock details.
856 * We want to be able to handle multiple superblock formats
857 * so we have a common interface to them all, and an array of
858 * different handlers.
859 * We rely on user-space to write the initial superblock, and support
860 * reading and updating of superblocks.
861 * Interface methods are:
862 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
863 * loads and validates a superblock on dev.
864 * if refdev != NULL, compare superblocks on both devices
865 * Return:
866 * 0 - dev has a superblock that is compatible with refdev
867 * 1 - dev has a superblock that is compatible and newer than refdev
868 * so dev should be used as the refdev in future
869 * -EINVAL superblock incompatible or invalid
870 * -othererror e.g. -EIO
871 *
872 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
873 * Verify that dev is acceptable into mddev.
874 * The first time, mddev->raid_disks will be 0, and data from
875 * dev should be merged in. Subsequent calls check that dev
876 * is new enough. Return 0 or -EINVAL
877 *
878 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
879 * Update the superblock for rdev with data in mddev
880 * This does not write to disc.
881 *
882 */
883
884struct super_type {
Chris Webb0cd17fe2008-06-28 08:31:46 +1000885 char *name;
886 struct module *owner;
887 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
888 int minor_version);
889 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
890 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
891 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
Andre Noll15f4a5f2008-07-21 14:42:12 +1000892 sector_t num_sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893};
894
895/*
Andre Noll0894cc32009-06-18 08:49:23 +1000896 * Check that the given mddev has no bitmap.
897 *
898 * This function is called from the run method of all personalities that do not
899 * support bitmaps. It prints an error message and returns non-zero if mddev
900 * has a bitmap. Otherwise, it returns 0.
901 *
902 */
903int md_check_no_bitmap(mddev_t *mddev)
904{
NeilBrownc3d97142009-12-14 12:49:52 +1100905 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
Andre Noll0894cc32009-06-18 08:49:23 +1000906 return 0;
907 printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
908 mdname(mddev), mddev->pers->name);
909 return 1;
910}
911EXPORT_SYMBOL(md_check_no_bitmap);
912
913/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 * load_super for 0.90.0
915 */
916static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
917{
918 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
919 mdp_super_t *sb;
920 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
922 /*
Andre Noll0f420352008-07-11 22:02:23 +1000923 * Calculate the position of the superblock (512byte sectors),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 * it's at the end of the disk.
925 *
926 * It also happens to be a multiple of 4Kb.
927 */
Andre Noll0f420352008-07-11 22:02:23 +1000928 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
NeilBrown0002b272005-09-09 16:23:53 -0700930 ret = read_disk_sb(rdev, MD_SB_BYTES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 if (ret) return ret;
932
933 ret = -EINVAL;
934
935 bdevname(rdev->bdev, b);
936 sb = (mdp_super_t*)page_address(rdev->sb_page);
937
938 if (sb->md_magic != MD_SB_MAGIC) {
939 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
940 b);
941 goto abort;
942 }
943
944 if (sb->major_version != 0 ||
NeilBrownf6705572006-03-27 01:18:11 -0800945 sb->minor_version < 90 ||
946 sb->minor_version > 91) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
948 sb->major_version, sb->minor_version,
949 b);
950 goto abort;
951 }
952
953 if (sb->raid_disks <= 0)
954 goto abort;
955
NeilBrown4d167f02007-05-09 02:35:37 -0700956 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
958 b);
959 goto abort;
960 }
961
962 rdev->preferred_minor = sb->md_minor;
963 rdev->data_offset = 0;
NeilBrown0002b272005-09-09 16:23:53 -0700964 rdev->sb_size = MD_SB_BYTES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
966 if (sb->level == LEVEL_MULTIPATH)
967 rdev->desc_nr = -1;
968 else
969 rdev->desc_nr = sb->this_disk.number;
970
Harvey Harrison9a7b2b02008-04-28 02:15:49 -0700971 if (!refdev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 ret = 1;
Harvey Harrison9a7b2b02008-04-28 02:15:49 -0700973 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 __u64 ev1, ev2;
975 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
976 if (!uuid_equal(refsb, sb)) {
977 printk(KERN_WARNING "md: %s has different UUID to %s\n",
978 b, bdevname(refdev->bdev,b2));
979 goto abort;
980 }
981 if (!sb_equal(refsb, sb)) {
982 printk(KERN_WARNING "md: %s has same UUID"
983 " but different superblock to %s\n",
984 b, bdevname(refdev->bdev, b2));
985 goto abort;
986 }
987 ev1 = md_event(sb);
988 ev2 = md_event(refsb);
989 if (ev1 > ev2)
990 ret = 1;
991 else
992 ret = 0;
993 }
NeilBrown8190e752009-06-18 08:48:58 +1000994 rdev->sectors = rdev->sb_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
Andre Nolldd8ac332009-03-31 14:33:13 +1100996 if (rdev->sectors < sb->size * 2 && sb->level > 1)
NeilBrown2bf071b2006-01-06 00:20:55 -0800997 /* "this cannot possibly happen" ... */
998 ret = -EINVAL;
999
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 abort:
1001 return ret;
1002}
1003
1004/*
1005 * validate_super for 0.90.0
1006 */
1007static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1008{
1009 mdp_disk_t *desc;
1010 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
NeilBrown07d84d102006-06-26 00:27:56 -07001011 __u64 ev1 = md_event(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
NeilBrown41158c72005-06-21 17:17:25 -07001013 rdev->raid_disk = -1;
NeilBrownc5d79ad2008-02-06 01:39:54 -08001014 clear_bit(Faulty, &rdev->flags);
1015 clear_bit(In_sync, &rdev->flags);
1016 clear_bit(WriteMostly, &rdev->flags);
1017 clear_bit(BarriersNotsupp, &rdev->flags);
1018
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 if (mddev->raid_disks == 0) {
1020 mddev->major_version = 0;
1021 mddev->minor_version = sb->minor_version;
1022 mddev->patch_version = sb->patch_version;
NeilBrowne6910632008-02-06 01:39:51 -08001023 mddev->external = 0;
Andre Noll9d8f0362009-06-18 08:45:01 +10001024 mddev->chunk_sectors = sb->chunk_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 mddev->ctime = sb->ctime;
1026 mddev->utime = sb->utime;
1027 mddev->level = sb->level;
NeilBrownd9d166c2006-01-06 00:20:51 -08001028 mddev->clevel[0] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 mddev->layout = sb->layout;
1030 mddev->raid_disks = sb->raid_disks;
Andre Noll58c0fed2009-03-31 14:33:13 +11001031 mddev->dev_sectors = sb->size * 2;
NeilBrown07d84d102006-06-26 00:27:56 -07001032 mddev->events = ev1;
NeilBrownc3d97142009-12-14 12:49:52 +11001033 mddev->bitmap_info.offset = 0;
1034 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
NeilBrownf6705572006-03-27 01:18:11 -08001036 if (mddev->minor_version >= 91) {
1037 mddev->reshape_position = sb->reshape_position;
1038 mddev->delta_disks = sb->delta_disks;
1039 mddev->new_level = sb->new_level;
1040 mddev->new_layout = sb->new_layout;
Andre Noll664e7c42009-06-18 08:45:27 +10001041 mddev->new_chunk_sectors = sb->new_chunk >> 9;
NeilBrownf6705572006-03-27 01:18:11 -08001042 } else {
1043 mddev->reshape_position = MaxSector;
1044 mddev->delta_disks = 0;
1045 mddev->new_level = mddev->level;
1046 mddev->new_layout = mddev->layout;
Andre Noll664e7c42009-06-18 08:45:27 +10001047 mddev->new_chunk_sectors = mddev->chunk_sectors;
NeilBrownf6705572006-03-27 01:18:11 -08001048 }
1049
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 if (sb->state & (1<<MD_SB_CLEAN))
1051 mddev->recovery_cp = MaxSector;
1052 else {
1053 if (sb->events_hi == sb->cp_events_hi &&
1054 sb->events_lo == sb->cp_events_lo) {
1055 mddev->recovery_cp = sb->recovery_cp;
1056 } else
1057 mddev->recovery_cp = 0;
1058 }
1059
1060 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
1061 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
1062 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
1063 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
1064
1065 mddev->max_disks = MD_SB_DISKS;
NeilBrowna654b9d82005-06-21 17:17:27 -07001066
1067 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
NeilBrownc3d97142009-12-14 12:49:52 +11001068 mddev->bitmap_info.file == NULL)
1069 mddev->bitmap_info.offset =
1070 mddev->bitmap_info.default_offset;
NeilBrowna654b9d82005-06-21 17:17:27 -07001071
NeilBrown41158c72005-06-21 17:17:25 -07001072 } else if (mddev->pers == NULL) {
1073 /* Insist on good event counter while assembling */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 ++ev1;
1075 if (ev1 < mddev->events)
1076 return -EINVAL;
NeilBrown41158c72005-06-21 17:17:25 -07001077 } else if (mddev->bitmap) {
1078 /* if adding to array with a bitmap, then we can accept an
1079 * older device ... but not too old.
1080 */
NeilBrown41158c72005-06-21 17:17:25 -07001081 if (ev1 < mddev->bitmap->events_cleared)
1082 return 0;
NeilBrown07d84d102006-06-26 00:27:56 -07001083 } else {
1084 if (ev1 < mddev->events)
1085 /* just a hot-add of a new device, leave raid_disk at -1 */
1086 return 0;
1087 }
NeilBrown41158c72005-06-21 17:17:25 -07001088
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 if (mddev->level != LEVEL_MULTIPATH) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 desc = sb->disks + rdev->desc_nr;
1091
1092 if (desc->state & (1<<MD_DISK_FAULTY))
NeilBrownb2d444d2005-11-08 21:39:31 -08001093 set_bit(Faulty, &rdev->flags);
NeilBrown7c7546c2006-06-26 00:27:41 -07001094 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
1095 desc->raid_disk < mddev->raid_disks */) {
NeilBrownb2d444d2005-11-08 21:39:31 -08001096 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 rdev->raid_disk = desc->raid_disk;
NeilBrown0261cd9f2009-11-13 17:40:48 +11001098 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
1099 /* active but not in sync implies recovery up to
1100 * reshape position. We don't know exactly where
1101 * that is, so set to zero for now */
1102 if (mddev->minor_version >= 91) {
1103 rdev->recovery_offset = 0;
1104 rdev->raid_disk = desc->raid_disk;
1105 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -07001107 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
1108 set_bit(WriteMostly, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -07001109 } else /* MULTIPATH are always insync */
NeilBrownb2d444d2005-11-08 21:39:31 -08001110 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 return 0;
1112}
1113
1114/*
1115 * sync_super for 0.90.0
1116 */
1117static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1118{
1119 mdp_super_t *sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 mdk_rdev_t *rdev2;
1121 int next_spare = mddev->raid_disks;
NeilBrown19133a42005-11-08 21:39:35 -08001122
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
1124 /* make rdev->sb match mddev data..
1125 *
1126 * 1/ zero out disks
1127 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1128 * 3/ any empty disks < next_spare become removed
1129 *
1130 * disks[0] gets initialised to REMOVED because
1131 * we cannot be sure from other fields if it has
1132 * been initialised or not.
1133 */
1134 int i;
1135 int active=0, working=0,failed=0,spare=0,nr_disks=0;
1136
NeilBrown61181562005-09-09 16:24:02 -07001137 rdev->sb_size = MD_SB_BYTES;
1138
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 sb = (mdp_super_t*)page_address(rdev->sb_page);
1140
1141 memset(sb, 0, sizeof(*sb));
1142
1143 sb->md_magic = MD_SB_MAGIC;
1144 sb->major_version = mddev->major_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 sb->patch_version = mddev->patch_version;
1146 sb->gvalid_words = 0; /* ignored */
1147 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
1148 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
1149 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
1150 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1151
1152 sb->ctime = mddev->ctime;
1153 sb->level = mddev->level;
Andre Noll58c0fed2009-03-31 14:33:13 +11001154 sb->size = mddev->dev_sectors / 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 sb->raid_disks = mddev->raid_disks;
1156 sb->md_minor = mddev->md_minor;
NeilBrowne6910632008-02-06 01:39:51 -08001157 sb->not_persistent = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 sb->utime = mddev->utime;
1159 sb->state = 0;
1160 sb->events_hi = (mddev->events>>32);
1161 sb->events_lo = (u32)mddev->events;
1162
NeilBrownf6705572006-03-27 01:18:11 -08001163 if (mddev->reshape_position == MaxSector)
1164 sb->minor_version = 90;
1165 else {
1166 sb->minor_version = 91;
1167 sb->reshape_position = mddev->reshape_position;
1168 sb->new_level = mddev->new_level;
1169 sb->delta_disks = mddev->delta_disks;
1170 sb->new_layout = mddev->new_layout;
Andre Noll664e7c42009-06-18 08:45:27 +10001171 sb->new_chunk = mddev->new_chunk_sectors << 9;
NeilBrownf6705572006-03-27 01:18:11 -08001172 }
1173 mddev->minor_version = sb->minor_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 if (mddev->in_sync)
1175 {
1176 sb->recovery_cp = mddev->recovery_cp;
1177 sb->cp_events_hi = (mddev->events>>32);
1178 sb->cp_events_lo = (u32)mddev->events;
1179 if (mddev->recovery_cp == MaxSector)
1180 sb->state = (1<< MD_SB_CLEAN);
1181 } else
1182 sb->recovery_cp = 0;
1183
1184 sb->layout = mddev->layout;
Andre Noll9d8f0362009-06-18 08:45:01 +10001185 sb->chunk_size = mddev->chunk_sectors << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
NeilBrownc3d97142009-12-14 12:49:52 +11001187 if (mddev->bitmap && mddev->bitmap_info.file == NULL)
NeilBrowna654b9d82005-06-21 17:17:27 -07001188 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1189
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 sb->disks[0].state = (1<<MD_DISK_REMOVED);
Cheng Renquan159ec1f2009-01-09 08:31:08 +11001191 list_for_each_entry(rdev2, &mddev->disks, same_set) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 mdp_disk_t *d;
NeilBrown86e6ffd2005-11-08 21:39:24 -08001193 int desc_nr;
NeilBrown0261cd9f2009-11-13 17:40:48 +11001194 int is_active = test_bit(In_sync, &rdev2->flags);
1195
1196 if (rdev2->raid_disk >= 0 &&
1197 sb->minor_version >= 91)
1198 /* we have nowhere to store the recovery_offset,
1199 * but if it is not below the reshape_position,
1200 * we can piggy-back on that.
1201 */
1202 is_active = 1;
1203 if (rdev2->raid_disk < 0 ||
1204 test_bit(Faulty, &rdev2->flags))
1205 is_active = 0;
1206 if (is_active)
NeilBrown86e6ffd2005-11-08 21:39:24 -08001207 desc_nr = rdev2->raid_disk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 else
NeilBrown86e6ffd2005-11-08 21:39:24 -08001209 desc_nr = next_spare++;
NeilBrown19133a42005-11-08 21:39:35 -08001210 rdev2->desc_nr = desc_nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 d = &sb->disks[rdev2->desc_nr];
1212 nr_disks++;
1213 d->number = rdev2->desc_nr;
1214 d->major = MAJOR(rdev2->bdev->bd_dev);
1215 d->minor = MINOR(rdev2->bdev->bd_dev);
NeilBrown0261cd9f2009-11-13 17:40:48 +11001216 if (is_active)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 d->raid_disk = rdev2->raid_disk;
1218 else
1219 d->raid_disk = rdev2->desc_nr; /* compatibility */
NeilBrown1be78922006-03-27 01:18:03 -08001220 if (test_bit(Faulty, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 d->state = (1<<MD_DISK_FAULTY);
NeilBrown0261cd9f2009-11-13 17:40:48 +11001222 else if (is_active) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 d->state = (1<<MD_DISK_ACTIVE);
NeilBrown0261cd9f2009-11-13 17:40:48 +11001224 if (test_bit(In_sync, &rdev2->flags))
1225 d->state |= (1<<MD_DISK_SYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 active++;
1227 working++;
1228 } else {
1229 d->state = 0;
1230 spare++;
1231 working++;
1232 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -07001233 if (test_bit(WriteMostly, &rdev2->flags))
1234 d->state |= (1<<MD_DISK_WRITEMOSTLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 /* now set the "removed" and "faulty" bits on any missing devices */
1237 for (i=0 ; i < mddev->raid_disks ; i++) {
1238 mdp_disk_t *d = &sb->disks[i];
1239 if (d->state == 0 && d->number == 0) {
1240 d->number = i;
1241 d->raid_disk = i;
1242 d->state = (1<<MD_DISK_REMOVED);
1243 d->state |= (1<<MD_DISK_FAULTY);
1244 failed++;
1245 }
1246 }
1247 sb->nr_disks = nr_disks;
1248 sb->active_disks = active;
1249 sb->working_disks = working;
1250 sb->failed_disks = failed;
1251 sb->spare_disks = spare;
1252
1253 sb->this_disk = sb->disks[rdev->desc_nr];
1254 sb->sb_csum = calc_sb_csum(sb);
1255}
1256
1257/*
Chris Webb0cd17fe2008-06-28 08:31:46 +10001258 * rdev_size_change for 0.90.0
1259 */
1260static unsigned long long
Andre Noll15f4a5f2008-07-21 14:42:12 +10001261super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
Chris Webb0cd17fe2008-06-28 08:31:46 +10001262{
Andre Noll58c0fed2009-03-31 14:33:13 +11001263 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
Chris Webb0cd17fe2008-06-28 08:31:46 +10001264 return 0; /* component must fit device */
NeilBrownc3d97142009-12-14 12:49:52 +11001265 if (rdev->mddev->bitmap_info.offset)
Chris Webb0cd17fe2008-06-28 08:31:46 +10001266 return 0; /* can't move bitmap */
Andre Noll0f420352008-07-11 22:02:23 +10001267 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
Andre Noll15f4a5f2008-07-21 14:42:12 +10001268 if (!num_sectors || num_sectors > rdev->sb_start)
1269 num_sectors = rdev->sb_start;
Andre Noll0f420352008-07-11 22:02:23 +10001270 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
Chris Webb0cd17fe2008-06-28 08:31:46 +10001271 rdev->sb_page);
1272 md_super_wait(rdev->mddev);
Andre Noll15f4a5f2008-07-21 14:42:12 +10001273 return num_sectors / 2; /* kB for sysfs */
Chris Webb0cd17fe2008-06-28 08:31:46 +10001274}
1275
1276
1277/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 * version 1 superblock
1279 */
1280
NeilBrown1c05b4b2006-10-21 10:24:08 -07001281static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282{
NeilBrown1c05b4b2006-10-21 10:24:08 -07001283 __le32 disk_csum;
1284 u32 csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 unsigned long long newcsum;
1286 int size = 256 + le32_to_cpu(sb->max_dev)*2;
NeilBrown1c05b4b2006-10-21 10:24:08 -07001287 __le32 *isuper = (__le32*)sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 int i;
1289
1290 disk_csum = sb->sb_csum;
1291 sb->sb_csum = 0;
1292 newcsum = 0;
1293 for (i=0; size>=4; size -= 4 )
1294 newcsum += le32_to_cpu(*isuper++);
1295
1296 if (size == 2)
NeilBrown1c05b4b2006-10-21 10:24:08 -07001297 newcsum += le16_to_cpu(*(__le16*) isuper);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
1299 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1300 sb->sb_csum = disk_csum;
1301 return cpu_to_le32(csum);
1302}
1303
1304static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1305{
1306 struct mdp_superblock_1 *sb;
1307 int ret;
Andre Noll0f420352008-07-11 22:02:23 +10001308 sector_t sb_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
NeilBrown0002b272005-09-09 16:23:53 -07001310 int bmask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
1312 /*
Andre Noll0f420352008-07-11 22:02:23 +10001313 * Calculate the position of the superblock in 512byte sectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 * It is always aligned to a 4K boundary and
1315 * depeding on minor_version, it can be:
1316 * 0: At least 8K, but less than 12K, from end of device
1317 * 1: At start of device
1318 * 2: 4K from start of device.
1319 */
1320 switch(minor_version) {
1321 case 0:
Andre Noll0f420352008-07-11 22:02:23 +10001322 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1323 sb_start -= 8*2;
1324 sb_start &= ~(sector_t)(4*2-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 break;
1326 case 1:
Andre Noll0f420352008-07-11 22:02:23 +10001327 sb_start = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 break;
1329 case 2:
Andre Noll0f420352008-07-11 22:02:23 +10001330 sb_start = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 break;
1332 default:
1333 return -EINVAL;
1334 }
Andre Noll0f420352008-07-11 22:02:23 +10001335 rdev->sb_start = sb_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336
NeilBrown0002b272005-09-09 16:23:53 -07001337 /* superblock is rarely larger than 1K, but it can be larger,
1338 * and it is safe to read 4k, so we do that
1339 */
1340 ret = read_disk_sb(rdev, 4096);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 if (ret) return ret;
1342
1343
1344 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1345
1346 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1347 sb->major_version != cpu_to_le32(1) ||
1348 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
Andre Noll0f420352008-07-11 22:02:23 +10001349 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
NeilBrown71c08052005-09-09 16:23:51 -07001350 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 return -EINVAL;
1352
1353 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1354 printk("md: invalid superblock checksum on %s\n",
1355 bdevname(rdev->bdev,b));
1356 return -EINVAL;
1357 }
1358 if (le64_to_cpu(sb->data_size) < 10) {
1359 printk("md: data_size too small on %s\n",
1360 bdevname(rdev->bdev,b));
1361 return -EINVAL;
1362 }
NeilBrowne11e93f2007-05-09 02:35:36 -07001363
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 rdev->preferred_minor = 0xffff;
1365 rdev->data_offset = le64_to_cpu(sb->data_offset);
NeilBrown4dbcdc72006-01-06 00:20:52 -08001366 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
NeilBrown0002b272005-09-09 16:23:53 -07001368 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
Martin K. Petersene1defc42009-05-22 17:17:49 -04001369 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
NeilBrown0002b272005-09-09 16:23:53 -07001370 if (rdev->sb_size & bmask)
NeilBrowna1801f82008-03-04 14:29:31 -08001371 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1372
1373 if (minor_version
Andre Noll0f420352008-07-11 22:02:23 +10001374 && rdev->data_offset < sb_start + (rdev->sb_size/512))
NeilBrowna1801f82008-03-04 14:29:31 -08001375 return -EINVAL;
NeilBrown0002b272005-09-09 16:23:53 -07001376
NeilBrown31b65a02006-07-10 04:44:14 -07001377 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1378 rdev->desc_nr = -1;
1379 else
1380 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1381
Harvey Harrison9a7b2b02008-04-28 02:15:49 -07001382 if (!refdev) {
NeilBrown8ed75462006-02-03 03:03:41 -08001383 ret = 1;
Harvey Harrison9a7b2b02008-04-28 02:15:49 -07001384 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 __u64 ev1, ev2;
1386 struct mdp_superblock_1 *refsb =
1387 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1388
1389 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1390 sb->level != refsb->level ||
1391 sb->layout != refsb->layout ||
1392 sb->chunksize != refsb->chunksize) {
1393 printk(KERN_WARNING "md: %s has strangely different"
1394 " superblock to %s\n",
1395 bdevname(rdev->bdev,b),
1396 bdevname(refdev->bdev,b2));
1397 return -EINVAL;
1398 }
1399 ev1 = le64_to_cpu(sb->events);
1400 ev2 = le64_to_cpu(refsb->events);
1401
1402 if (ev1 > ev2)
NeilBrown8ed75462006-02-03 03:03:41 -08001403 ret = 1;
1404 else
1405 ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 }
NeilBrowna1801f82008-03-04 14:29:31 -08001407 if (minor_version)
Andre Nolldd8ac332009-03-31 14:33:13 +11001408 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1409 le64_to_cpu(sb->data_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 else
Andre Nolldd8ac332009-03-31 14:33:13 +11001411 rdev->sectors = rdev->sb_start;
1412 if (rdev->sectors < le64_to_cpu(sb->data_size))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 return -EINVAL;
Andre Nolldd8ac332009-03-31 14:33:13 +11001414 rdev->sectors = le64_to_cpu(sb->data_size);
Andre Nolldd8ac332009-03-31 14:33:13 +11001415 if (le64_to_cpu(sb->size) > rdev->sectors)
NeilBrown2bf071b2006-01-06 00:20:55 -08001416 return -EINVAL;
NeilBrown8ed75462006-02-03 03:03:41 -08001417 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418}
1419
1420static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1421{
1422 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
NeilBrown07d84d102006-06-26 00:27:56 -07001423 __u64 ev1 = le64_to_cpu(sb->events);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
NeilBrown41158c72005-06-21 17:17:25 -07001425 rdev->raid_disk = -1;
NeilBrownc5d79ad2008-02-06 01:39:54 -08001426 clear_bit(Faulty, &rdev->flags);
1427 clear_bit(In_sync, &rdev->flags);
1428 clear_bit(WriteMostly, &rdev->flags);
1429 clear_bit(BarriersNotsupp, &rdev->flags);
1430
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 if (mddev->raid_disks == 0) {
1432 mddev->major_version = 1;
1433 mddev->patch_version = 0;
NeilBrowne6910632008-02-06 01:39:51 -08001434 mddev->external = 0;
Andre Noll9d8f0362009-06-18 08:45:01 +10001435 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1437 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1438 mddev->level = le32_to_cpu(sb->level);
NeilBrownd9d166c2006-01-06 00:20:51 -08001439 mddev->clevel[0] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 mddev->layout = le32_to_cpu(sb->layout);
1441 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
Andre Noll58c0fed2009-03-31 14:33:13 +11001442 mddev->dev_sectors = le64_to_cpu(sb->size);
NeilBrown07d84d102006-06-26 00:27:56 -07001443 mddev->events = ev1;
NeilBrownc3d97142009-12-14 12:49:52 +11001444 mddev->bitmap_info.offset = 0;
1445 mddev->bitmap_info.default_offset = 1024 >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446
1447 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1448 memcpy(mddev->uuid, sb->set_uuid, 16);
1449
1450 mddev->max_disks = (4096-256)/2;
NeilBrowna654b9d82005-06-21 17:17:27 -07001451
NeilBrown71c08052005-09-09 16:23:51 -07001452 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
NeilBrownc3d97142009-12-14 12:49:52 +11001453 mddev->bitmap_info.file == NULL )
1454 mddev->bitmap_info.offset =
1455 (__s32)le32_to_cpu(sb->bitmap_offset);
NeilBrowne11e93f2007-05-09 02:35:36 -07001456
NeilBrownf6705572006-03-27 01:18:11 -08001457 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1458 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1459 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1460 mddev->new_level = le32_to_cpu(sb->new_level);
1461 mddev->new_layout = le32_to_cpu(sb->new_layout);
Andre Noll664e7c42009-06-18 08:45:27 +10001462 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
NeilBrownf6705572006-03-27 01:18:11 -08001463 } else {
1464 mddev->reshape_position = MaxSector;
1465 mddev->delta_disks = 0;
1466 mddev->new_level = mddev->level;
1467 mddev->new_layout = mddev->layout;
Andre Noll664e7c42009-06-18 08:45:27 +10001468 mddev->new_chunk_sectors = mddev->chunk_sectors;
NeilBrownf6705572006-03-27 01:18:11 -08001469 }
1470
NeilBrown41158c72005-06-21 17:17:25 -07001471 } else if (mddev->pers == NULL) {
1472 /* Insist of good event counter while assembling */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 ++ev1;
1474 if (ev1 < mddev->events)
1475 return -EINVAL;
NeilBrown41158c72005-06-21 17:17:25 -07001476 } else if (mddev->bitmap) {
1477 /* If adding to array with a bitmap, then we can accept an
1478 * older device, but not too old.
1479 */
NeilBrown41158c72005-06-21 17:17:25 -07001480 if (ev1 < mddev->bitmap->events_cleared)
1481 return 0;
NeilBrown07d84d102006-06-26 00:27:56 -07001482 } else {
1483 if (ev1 < mddev->events)
1484 /* just a hot-add of a new device, leave raid_disk at -1 */
1485 return 0;
1486 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 if (mddev->level != LEVEL_MULTIPATH) {
1488 int role;
NeilBrown3673f302009-08-03 10:59:56 +10001489 if (rdev->desc_nr < 0 ||
1490 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1491 role = 0xffff;
1492 rdev->desc_nr = -1;
1493 } else
1494 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 switch(role) {
1496 case 0xffff: /* spare */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 break;
1498 case 0xfffe: /* faulty */
NeilBrownb2d444d2005-11-08 21:39:31 -08001499 set_bit(Faulty, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 break;
1501 default:
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001502 if ((le32_to_cpu(sb->feature_map) &
1503 MD_FEATURE_RECOVERY_OFFSET))
1504 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1505 else
1506 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 rdev->raid_disk = role;
1508 break;
1509 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -07001510 if (sb->devflags & WriteMostly1)
1511 set_bit(WriteMostly, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -07001512 } else /* MULTIPATH are always insync */
NeilBrownb2d444d2005-11-08 21:39:31 -08001513 set_bit(In_sync, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -07001514
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 return 0;
1516}
1517
1518static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1519{
1520 struct mdp_superblock_1 *sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 mdk_rdev_t *rdev2;
1522 int max_dev, i;
1523 /* make rdev->sb match mddev and rdev data. */
1524
1525 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1526
1527 sb->feature_map = 0;
1528 sb->pad0 = 0;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001529 sb->recovery_offset = cpu_to_le64(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 memset(sb->pad1, 0, sizeof(sb->pad1));
1531 memset(sb->pad2, 0, sizeof(sb->pad2));
1532 memset(sb->pad3, 0, sizeof(sb->pad3));
1533
1534 sb->utime = cpu_to_le64((__u64)mddev->utime);
1535 sb->events = cpu_to_le64(mddev->events);
1536 if (mddev->in_sync)
1537 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1538 else
1539 sb->resync_offset = cpu_to_le64(0);
1540
NeilBrown1c05b4b2006-10-21 10:24:08 -07001541 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
NeilBrown4dbcdc72006-01-06 00:20:52 -08001542
NeilBrownf0ca3402006-02-02 14:28:04 -08001543 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
Andre Noll58c0fed2009-03-31 14:33:13 +11001544 sb->size = cpu_to_le64(mddev->dev_sectors);
Andre Noll9d8f0362009-06-18 08:45:01 +10001545 sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
NeilBrown62e1e382009-05-26 09:40:59 +10001546 sb->level = cpu_to_le32(mddev->level);
1547 sb->layout = cpu_to_le32(mddev->layout);
NeilBrownf0ca3402006-02-02 14:28:04 -08001548
NeilBrownc3d97142009-12-14 12:49:52 +11001549 if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
1550 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
NeilBrown71c08052005-09-09 16:23:51 -07001551 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
NeilBrowna654b9d82005-06-21 17:17:27 -07001552 }
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001553
1554 if (rdev->raid_disk >= 0 &&
NeilBrown97e4f422009-03-31 14:33:13 +11001555 !test_bit(In_sync, &rdev->flags)) {
NeilBrown93be75f2009-12-14 12:50:06 +11001556 sb->feature_map |=
1557 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1558 sb->recovery_offset =
1559 cpu_to_le64(rdev->recovery_offset);
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001560 }
1561
NeilBrownf6705572006-03-27 01:18:11 -08001562 if (mddev->reshape_position != MaxSector) {
1563 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1564 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1565 sb->new_layout = cpu_to_le32(mddev->new_layout);
1566 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1567 sb->new_level = cpu_to_le32(mddev->new_level);
Andre Noll664e7c42009-06-18 08:45:27 +10001568 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
NeilBrownf6705572006-03-27 01:18:11 -08001569 }
NeilBrowna654b9d82005-06-21 17:17:27 -07001570
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 max_dev = 0;
Cheng Renquan159ec1f2009-01-09 08:31:08 +11001572 list_for_each_entry(rdev2, &mddev->disks, same_set)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 if (rdev2->desc_nr+1 > max_dev)
1574 max_dev = rdev2->desc_nr+1;
NeilBrowna778b732007-05-23 13:58:10 -07001575
NeilBrown70471da2009-08-03 10:59:57 +10001576 if (max_dev > le32_to_cpu(sb->max_dev)) {
1577 int bmask;
NeilBrowna778b732007-05-23 13:58:10 -07001578 sb->max_dev = cpu_to_le32(max_dev);
NeilBrown70471da2009-08-03 10:59:57 +10001579 rdev->sb_size = max_dev * 2 + 256;
1580 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1581 if (rdev->sb_size & bmask)
1582 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1583 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 for (i=0; i<max_dev;i++)
1585 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1586
Cheng Renquan159ec1f2009-01-09 08:31:08 +11001587 list_for_each_entry(rdev2, &mddev->disks, same_set) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 i = rdev2->desc_nr;
NeilBrownb2d444d2005-11-08 21:39:31 -08001589 if (test_bit(Faulty, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 sb->dev_roles[i] = cpu_to_le16(0xfffe);
NeilBrownb2d444d2005-11-08 21:39:31 -08001591 else if (test_bit(In_sync, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
NeilBrown93be75f2009-12-14 12:50:06 +11001593 else if (rdev2->raid_disk >= 0)
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001594 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 else
1596 sb->dev_roles[i] = cpu_to_le16(0xffff);
1597 }
1598
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 sb->sb_csum = calc_sb_1_csum(sb);
1600}
1601
Chris Webb0cd17fe2008-06-28 08:31:46 +10001602static unsigned long long
Andre Noll15f4a5f2008-07-21 14:42:12 +10001603super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
Chris Webb0cd17fe2008-06-28 08:31:46 +10001604{
1605 struct mdp_superblock_1 *sb;
Andre Noll15f4a5f2008-07-21 14:42:12 +10001606 sector_t max_sectors;
Andre Noll58c0fed2009-03-31 14:33:13 +11001607 if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
Chris Webb0cd17fe2008-06-28 08:31:46 +10001608 return 0; /* component must fit device */
Andre Noll0f420352008-07-11 22:02:23 +10001609 if (rdev->sb_start < rdev->data_offset) {
Chris Webb0cd17fe2008-06-28 08:31:46 +10001610 /* minor versions 1 and 2; superblock before data */
Andre Noll15f4a5f2008-07-21 14:42:12 +10001611 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1612 max_sectors -= rdev->data_offset;
1613 if (!num_sectors || num_sectors > max_sectors)
1614 num_sectors = max_sectors;
NeilBrownc3d97142009-12-14 12:49:52 +11001615 } else if (rdev->mddev->bitmap_info.offset) {
Chris Webb0cd17fe2008-06-28 08:31:46 +10001616 /* minor version 0 with bitmap we can't move */
1617 return 0;
1618 } else {
1619 /* minor version 0; superblock after data */
Andre Noll0f420352008-07-11 22:02:23 +10001620 sector_t sb_start;
1621 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1622 sb_start &= ~(sector_t)(4*2 - 1);
Andre Nolldd8ac332009-03-31 14:33:13 +11001623 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
Andre Noll15f4a5f2008-07-21 14:42:12 +10001624 if (!num_sectors || num_sectors > max_sectors)
1625 num_sectors = max_sectors;
Andre Noll0f420352008-07-11 22:02:23 +10001626 rdev->sb_start = sb_start;
Chris Webb0cd17fe2008-06-28 08:31:46 +10001627 }
1628 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
Andre Noll15f4a5f2008-07-21 14:42:12 +10001629 sb->data_size = cpu_to_le64(num_sectors);
Andre Noll0f420352008-07-11 22:02:23 +10001630 sb->super_offset = rdev->sb_start;
Chris Webb0cd17fe2008-06-28 08:31:46 +10001631 sb->sb_csum = calc_sb_1_csum(sb);
Andre Noll0f420352008-07-11 22:02:23 +10001632 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
Chris Webb0cd17fe2008-06-28 08:31:46 +10001633 rdev->sb_page);
1634 md_super_wait(rdev->mddev);
Andre Noll15f4a5f2008-07-21 14:42:12 +10001635 return num_sectors / 2; /* kB for sysfs */
Chris Webb0cd17fe2008-06-28 08:31:46 +10001636}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637
Adrian Bunk75c96f82005-05-05 16:16:09 -07001638static struct super_type super_types[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 [0] = {
1640 .name = "0.90.0",
1641 .owner = THIS_MODULE,
Chris Webb0cd17fe2008-06-28 08:31:46 +10001642 .load_super = super_90_load,
1643 .validate_super = super_90_validate,
1644 .sync_super = super_90_sync,
1645 .rdev_size_change = super_90_rdev_size_change,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 },
1647 [1] = {
1648 .name = "md-1",
1649 .owner = THIS_MODULE,
Chris Webb0cd17fe2008-06-28 08:31:46 +10001650 .load_super = super_1_load,
1651 .validate_super = super_1_validate,
1652 .sync_super = super_1_sync,
1653 .rdev_size_change = super_1_rdev_size_change,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 },
1655};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656
1657static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1658{
NeilBrown7dd5e7c32007-02-28 20:11:35 -08001659 mdk_rdev_t *rdev, *rdev2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660
NeilBrown4b809912008-07-21 17:05:25 +10001661 rcu_read_lock();
1662 rdev_for_each_rcu(rdev, mddev1)
1663 rdev_for_each_rcu(rdev2, mddev2)
NeilBrown7dd5e7c32007-02-28 20:11:35 -08001664 if (rdev->bdev->bd_contains ==
NeilBrown4b809912008-07-21 17:05:25 +10001665 rdev2->bdev->bd_contains) {
1666 rcu_read_unlock();
NeilBrown7dd5e7c32007-02-28 20:11:35 -08001667 return 1;
NeilBrown4b809912008-07-21 17:05:25 +10001668 }
1669 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 return 0;
1671}
1672
1673static LIST_HEAD(pending_raid_disks);
1674
Andre Nollac5e7112009-08-03 10:59:47 +10001675/*
1676 * Try to register data integrity profile for an mddev
1677 *
1678 * This is called when an array is started and after a disk has been kicked
1679 * from the array. It only succeeds if all working and active component devices
1680 * are integrity capable with matching profiles.
1681 */
1682int md_integrity_register(mddev_t *mddev)
Martin K. Petersen3f9d99c2009-03-31 14:27:02 +11001683{
Andre Nollac5e7112009-08-03 10:59:47 +10001684 mdk_rdev_t *rdev, *reference = NULL;
Martin K. Petersen3f9d99c2009-03-31 14:27:02 +11001685
Andre Nollac5e7112009-08-03 10:59:47 +10001686 if (list_empty(&mddev->disks))
1687 return 0; /* nothing to do */
1688 if (blk_get_integrity(mddev->gendisk))
1689 return 0; /* already registered */
1690 list_for_each_entry(rdev, &mddev->disks, same_set) {
1691 /* skip spares and non-functional disks */
1692 if (test_bit(Faulty, &rdev->flags))
1693 continue;
1694 if (rdev->raid_disk < 0)
1695 continue;
1696 /*
1697 * If at least one rdev is not integrity capable, we can not
1698 * enable data integrity for the md device.
1699 */
1700 if (!bdev_get_integrity(rdev->bdev))
1701 return -EINVAL;
1702 if (!reference) {
1703 /* Use the first rdev as the reference */
1704 reference = rdev;
1705 continue;
1706 }
1707 /* does this rdev's profile match the reference profile? */
1708 if (blk_integrity_compare(reference->bdev->bd_disk,
1709 rdev->bdev->bd_disk) < 0)
1710 return -EINVAL;
Martin K. Petersen3f9d99c2009-03-31 14:27:02 +11001711 }
Andre Nollac5e7112009-08-03 10:59:47 +10001712 /*
1713 * All component devices are integrity capable and have matching
1714 * profiles, register the common profile for the md device.
1715 */
1716 if (blk_integrity_register(mddev->gendisk,
1717 bdev_get_integrity(reference->bdev)) != 0) {
1718 printk(KERN_ERR "md: failed to register integrity for %s\n",
1719 mdname(mddev));
1720 return -EINVAL;
Martin K. Petersen3f9d99c2009-03-31 14:27:02 +11001721 }
Andre Nollac5e7112009-08-03 10:59:47 +10001722 printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1723 mdname(mddev));
1724 return 0;
Martin K. Petersen3f9d99c2009-03-31 14:27:02 +11001725}
Andre Nollac5e7112009-08-03 10:59:47 +10001726EXPORT_SYMBOL(md_integrity_register);
1727
1728/* Disable data integrity if non-capable/non-matching disk is being added */
1729void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1730{
1731 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1732 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1733
1734 if (!bi_mddev) /* nothing to do */
1735 return;
1736 if (rdev->raid_disk < 0) /* skip spares */
1737 return;
1738 if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1739 rdev->bdev->bd_disk) >= 0)
1740 return;
1741 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1742 blk_integrity_unregister(mddev->gendisk);
1743}
1744EXPORT_SYMBOL(md_integrity_add_rdev);
Martin K. Petersen3f9d99c2009-03-31 14:27:02 +11001745
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1747{
NeilBrown7dd5e7c32007-02-28 20:11:35 -08001748 char b[BDEVNAME_SIZE];
NeilBrownf637b9f2005-11-08 21:39:37 -08001749 struct kobject *ko;
Neil Brown1edf80d2006-01-12 01:05:23 -08001750 char *s;
NeilBrown5e55e2f2007-03-26 21:32:14 -08001751 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752
1753 if (rdev->mddev) {
1754 MD_BUG();
1755 return -EINVAL;
1756 }
Dan Williams11e2ede2008-04-30 00:52:32 -07001757
1758 /* prevent duplicates */
1759 if (find_rdev(mddev, rdev->bdev->bd_dev))
1760 return -EEXIST;
1761
Andre Nolldd8ac332009-03-31 14:33:13 +11001762 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1763 if (rdev->sectors && (mddev->dev_sectors == 0 ||
1764 rdev->sectors < mddev->dev_sectors)) {
NeilBrowna778b732007-05-23 13:58:10 -07001765 if (mddev->pers) {
1766 /* Cannot change size, so fail
1767 * If mddev->level <= 0, then we don't care
1768 * about aligning sizes (e.g. linear)
1769 */
1770 if (mddev->level > 0)
1771 return -ENOSPC;
1772 } else
Andre Nolldd8ac332009-03-31 14:33:13 +11001773 mddev->dev_sectors = rdev->sectors;
NeilBrown2bf071b2006-01-06 00:20:55 -08001774 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775
1776 /* Verify rdev->desc_nr is unique.
1777 * If it is -1, assign a free number, else
1778 * check number is not in use
1779 */
1780 if (rdev->desc_nr < 0) {
1781 int choice = 0;
1782 if (mddev->pers) choice = mddev->raid_disks;
1783 while (find_rdev_nr(mddev, choice))
1784 choice++;
1785 rdev->desc_nr = choice;
1786 } else {
1787 if (find_rdev_nr(mddev, rdev->desc_nr))
1788 return -EBUSY;
1789 }
NeilBrownde01dfa2009-02-06 18:02:46 +11001790 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1791 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1792 mdname(mddev), mddev->max_disks);
1793 return -EBUSY;
1794 }
NeilBrown19133a42005-11-08 21:39:35 -08001795 bdevname(rdev->bdev,b);
Greg Kroah-Hartman649316b2007-12-17 23:05:35 -07001796 while ( (s=strchr(b, '/')) != NULL)
Neil Brown1edf80d2006-01-12 01:05:23 -08001797 *s = '!';
Greg Kroah-Hartman649316b2007-12-17 23:05:35 -07001798
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799 rdev->mddev = mddev;
NeilBrown19133a42005-11-08 21:39:35 -08001800 printk(KERN_INFO "md: bind<%s>\n", b);
NeilBrown86e6ffd2005-11-08 21:39:24 -08001801
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -07001802 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
NeilBrown5e55e2f2007-03-26 21:32:14 -08001803 goto fail;
NeilBrown86e6ffd2005-11-08 21:39:24 -08001804
Tejun Heo0762b8b2008-08-25 19:56:12 +09001805 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
NeilBrown5e55e2f2007-03-26 21:32:14 -08001806 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1807 kobject_del(&rdev->kobj);
1808 goto fail;
1809 }
NeilBrown3c0ee632008-10-21 13:25:28 +11001810 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1811
NeilBrown4b809912008-07-21 17:05:25 +10001812 list_add_rcu(&rdev->same_set, &mddev->disks);
NeilBrownc5d79ad2008-02-06 01:39:54 -08001813 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
NeilBrown4044ba52009-01-09 08:31:11 +11001814
1815 /* May as well allow recovery to be retried once */
1816 mddev->recovery_disabled = 0;
Martin K. Petersen3f9d99c2009-03-31 14:27:02 +11001817
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 return 0;
NeilBrown5e55e2f2007-03-26 21:32:14 -08001819
1820 fail:
1821 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1822 b, mdname(mddev));
1823 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824}
1825
NeilBrown177a99b2008-02-06 01:39:56 -08001826static void md_delayed_delete(struct work_struct *ws)
NeilBrown5792a282007-04-04 19:08:18 -07001827{
1828 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1829 kobject_del(&rdev->kobj);
NeilBrown177a99b2008-02-06 01:39:56 -08001830 kobject_put(&rdev->kobj);
NeilBrown5792a282007-04-04 19:08:18 -07001831}
1832
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1834{
1835 char b[BDEVNAME_SIZE];
1836 if (!rdev->mddev) {
1837 MD_BUG();
1838 return;
1839 }
Jun'ichi Nomura5463c792006-03-27 01:17:58 -08001840 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
NeilBrown4b809912008-07-21 17:05:25 +10001841 list_del_rcu(&rdev->same_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1843 rdev->mddev = NULL;
NeilBrown86e6ffd2005-11-08 21:39:24 -08001844 sysfs_remove_link(&rdev->kobj, "block");
NeilBrown3c0ee632008-10-21 13:25:28 +11001845 sysfs_put(rdev->sysfs_state);
1846 rdev->sysfs_state = NULL;
NeilBrown5792a282007-04-04 19:08:18 -07001847 /* We need to delay this, otherwise we can deadlock when
NeilBrown4b809912008-07-21 17:05:25 +10001848 * writing to 'remove' to "dev/state". We also need
1849 * to delay it due to rcu usage.
NeilBrown5792a282007-04-04 19:08:18 -07001850 */
NeilBrown4b809912008-07-21 17:05:25 +10001851 synchronize_rcu();
NeilBrown177a99b2008-02-06 01:39:56 -08001852 INIT_WORK(&rdev->del_work, md_delayed_delete);
1853 kobject_get(&rdev->kobj);
NeilBrown5792a282007-04-04 19:08:18 -07001854 schedule_work(&rdev->del_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855}
1856
1857/*
1858 * prevent the device from being mounted, repartitioned or
1859 * otherwise reused by a RAID array (or any other kernel
1860 * subsystem), by bd_claiming the device.
1861 */
NeilBrownc5d79ad2008-02-06 01:39:54 -08001862static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863{
1864 int err = 0;
1865 struct block_device *bdev;
1866 char b[BDEVNAME_SIZE];
1867
Peter Zijlstra2e7b6512006-12-08 02:36:13 -08001868 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 if (IS_ERR(bdev)) {
1870 printk(KERN_ERR "md: could not open %s.\n",
1871 __bdevname(dev, b));
1872 return PTR_ERR(bdev);
1873 }
NeilBrownc5d79ad2008-02-06 01:39:54 -08001874 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 if (err) {
1876 printk(KERN_ERR "md: could not bd_claim %s.\n",
1877 bdevname(bdev, b));
Al Viro9a1c3542008-02-22 20:40:24 -05001878 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 return err;
1880 }
NeilBrownc5d79ad2008-02-06 01:39:54 -08001881 if (!shared)
1882 set_bit(AllReserved, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 rdev->bdev = bdev;
1884 return err;
1885}
1886
1887static void unlock_rdev(mdk_rdev_t *rdev)
1888{
1889 struct block_device *bdev = rdev->bdev;
1890 rdev->bdev = NULL;
1891 if (!bdev)
1892 MD_BUG();
1893 bd_release(bdev);
Al Viro9a1c3542008-02-22 20:40:24 -05001894 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895}
1896
1897void md_autodetect_dev(dev_t dev);
1898
1899static void export_rdev(mdk_rdev_t * rdev)
1900{
1901 char b[BDEVNAME_SIZE];
1902 printk(KERN_INFO "md: export_rdev(%s)\n",
1903 bdevname(rdev->bdev,b));
1904 if (rdev->mddev)
1905 MD_BUG();
1906 free_disk_sb(rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907#ifndef MODULE
NeilBrownd0fae182008-03-04 14:29:31 -08001908 if (test_bit(AutoDetected, &rdev->flags))
1909 md_autodetect_dev(rdev->bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910#endif
1911 unlock_rdev(rdev);
NeilBrown86e6ffd2005-11-08 21:39:24 -08001912 kobject_put(&rdev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913}
1914
1915static void kick_rdev_from_array(mdk_rdev_t * rdev)
1916{
1917 unbind_rdev_from_array(rdev);
1918 export_rdev(rdev);
1919}
1920
1921static void export_array(mddev_t *mddev)
1922{
Cheng Renquan159ec1f2009-01-09 08:31:08 +11001923 mdk_rdev_t *rdev, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
NeilBrownd089c6a2008-02-06 01:39:59 -08001925 rdev_for_each(rdev, tmp, mddev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 if (!rdev->mddev) {
1927 MD_BUG();
1928 continue;
1929 }
1930 kick_rdev_from_array(rdev);
1931 }
1932 if (!list_empty(&mddev->disks))
1933 MD_BUG();
1934 mddev->raid_disks = 0;
1935 mddev->major_version = 0;
1936}
1937
1938static void print_desc(mdp_disk_t *desc)
1939{
1940 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1941 desc->major,desc->minor,desc->raid_disk,desc->state);
1942}
1943
Cheng Renquancd2ac932009-01-09 08:31:08 +11001944static void print_sb_90(mdp_super_t *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945{
1946 int i;
1947
1948 printk(KERN_INFO
1949 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1950 sb->major_version, sb->minor_version, sb->patch_version,
1951 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1952 sb->ctime);
1953 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1954 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1955 sb->md_minor, sb->layout, sb->chunk_size);
1956 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1957 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1958 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1959 sb->failed_disks, sb->spare_disks,
1960 sb->sb_csum, (unsigned long)sb->events_lo);
1961
1962 printk(KERN_INFO);
1963 for (i = 0; i < MD_SB_DISKS; i++) {
1964 mdp_disk_t *desc;
1965
1966 desc = sb->disks + i;
1967 if (desc->number || desc->major || desc->minor ||
1968 desc->raid_disk || (desc->state && (desc->state != 4))) {
1969 printk(" D %2d: ", i);
1970 print_desc(desc);
1971 }
1972 }
1973 printk(KERN_INFO "md: THIS: ");
1974 print_desc(&sb->this_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975}
1976
Cheng Renquancd2ac932009-01-09 08:31:08 +11001977static void print_sb_1(struct mdp_superblock_1 *sb)
1978{
1979 __u8 *uuid;
1980
1981 uuid = sb->set_uuid;
Joe Perchesad361c92009-07-06 13:05:40 -07001982 printk(KERN_INFO
Joe Perches7b75c2f2009-12-14 18:01:12 -08001983 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
Joe Perchesad361c92009-07-06 13:05:40 -07001984 "md: Name: \"%s\" CT:%llu\n",
Cheng Renquancd2ac932009-01-09 08:31:08 +11001985 le32_to_cpu(sb->major_version),
1986 le32_to_cpu(sb->feature_map),
Joe Perches7b75c2f2009-12-14 18:01:12 -08001987 uuid,
Cheng Renquancd2ac932009-01-09 08:31:08 +11001988 sb->set_name,
1989 (unsigned long long)le64_to_cpu(sb->ctime)
1990 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1991
1992 uuid = sb->device_uuid;
Joe Perchesad361c92009-07-06 13:05:40 -07001993 printk(KERN_INFO
1994 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
Cheng Renquancd2ac932009-01-09 08:31:08 +11001995 " RO:%llu\n"
Joe Perches7b75c2f2009-12-14 18:01:12 -08001996 "md: Dev:%08x UUID: %pU\n"
Joe Perchesad361c92009-07-06 13:05:40 -07001997 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1998 "md: (MaxDev:%u) \n",
Cheng Renquancd2ac932009-01-09 08:31:08 +11001999 le32_to_cpu(sb->level),
2000 (unsigned long long)le64_to_cpu(sb->size),
2001 le32_to_cpu(sb->raid_disks),
2002 le32_to_cpu(sb->layout),
2003 le32_to_cpu(sb->chunksize),
2004 (unsigned long long)le64_to_cpu(sb->data_offset),
2005 (unsigned long long)le64_to_cpu(sb->data_size),
2006 (unsigned long long)le64_to_cpu(sb->super_offset),
2007 (unsigned long long)le64_to_cpu(sb->recovery_offset),
2008 le32_to_cpu(sb->dev_number),
Joe Perches7b75c2f2009-12-14 18:01:12 -08002009 uuid,
Cheng Renquancd2ac932009-01-09 08:31:08 +11002010 sb->devflags,
2011 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
2012 (unsigned long long)le64_to_cpu(sb->events),
2013 (unsigned long long)le64_to_cpu(sb->resync_offset),
2014 le32_to_cpu(sb->sb_csum),
2015 le32_to_cpu(sb->max_dev)
2016 );
2017}
2018
2019static void print_rdev(mdk_rdev_t *rdev, int major_version)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020{
2021 char b[BDEVNAME_SIZE];
Andre Nolldd8ac332009-03-31 14:33:13 +11002022 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2023 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
NeilBrownb2d444d2005-11-08 21:39:31 -08002024 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
2025 rdev->desc_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 if (rdev->sb_loaded) {
Cheng Renquancd2ac932009-01-09 08:31:08 +11002027 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
2028 switch (major_version) {
2029 case 0:
2030 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
2031 break;
2032 case 1:
2033 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
2034 break;
2035 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 } else
2037 printk(KERN_INFO "md: no rdev superblock!\n");
2038}
2039
Adrian Bunk5e563412006-06-26 00:27:42 -07002040static void md_print_devices(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041{
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002042 struct list_head *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 mdk_rdev_t *rdev;
2044 mddev_t *mddev;
2045 char b[BDEVNAME_SIZE];
2046
2047 printk("\n");
2048 printk("md: **********************************\n");
2049 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2050 printk("md: **********************************\n");
NeilBrown29ac4aa2008-02-06 01:39:58 -08002051 for_each_mddev(mddev, tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052
NeilBrown32a76272005-06-21 17:17:14 -07002053 if (mddev->bitmap)
2054 bitmap_print_sb(mddev->bitmap);
2055 else
2056 printk("%s: ", mdname(mddev));
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002057 list_for_each_entry(rdev, &mddev->disks, same_set)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 printk("<%s>", bdevname(rdev->bdev,b));
2059 printk("\n");
2060
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002061 list_for_each_entry(rdev, &mddev->disks, same_set)
Cheng Renquancd2ac932009-01-09 08:31:08 +11002062 print_rdev(rdev, mddev->major_version);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 }
2064 printk("md: **********************************\n");
2065 printk("\n");
2066}
2067
2068
NeilBrown42543762006-06-26 00:27:57 -07002069static void sync_sbs(mddev_t * mddev, int nospares)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070{
NeilBrown42543762006-06-26 00:27:57 -07002071 /* Update each superblock (in-memory image), but
2072 * if we are allowed to, skip spares which already
2073 * have the right event counter, or have one earlier
2074 * (which would mean they aren't being marked as dirty
2075 * with the rest of the array)
2076 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077 mdk_rdev_t *rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078
NeilBrown5e865102009-11-12 12:08:04 +11002079 /* First make sure individual recovery_offsets are correct */
2080 list_for_each_entry(rdev, &mddev->disks, same_set) {
2081 if (rdev->raid_disk >= 0 &&
2082 !test_bit(In_sync, &rdev->flags) &&
2083 mddev->curr_resync_completed > rdev->recovery_offset)
2084 rdev->recovery_offset = mddev->curr_resync_completed;
2085
2086 }
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002087 list_for_each_entry(rdev, &mddev->disks, same_set) {
NeilBrown42543762006-06-26 00:27:57 -07002088 if (rdev->sb_events == mddev->events ||
2089 (nospares &&
2090 rdev->raid_disk < 0 &&
2091 (rdev->sb_events&1)==0 &&
2092 rdev->sb_events+1 == mddev->events)) {
2093 /* Don't update this superblock */
2094 rdev->sb_loaded = 2;
2095 } else {
2096 super_types[mddev->major_version].
2097 sync_super(mddev, rdev);
2098 rdev->sb_loaded = 1;
2099 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 }
2101}
2102
NeilBrown850b2b42006-10-03 01:15:46 -07002103static void md_update_sb(mddev_t * mddev, int force_change)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 mdk_rdev_t *rdev;
NeilBrown06d91a52005-06-21 17:17:12 -07002106 int sync_req;
NeilBrown42543762006-06-26 00:27:57 -07002107 int nospares = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108
NeilBrown1b57f132009-06-18 08:48:19 +10002109 mddev->utime = get_seconds();
NeilBrown8377bc82008-04-30 00:52:28 -07002110 if (mddev->external)
2111 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112repeat:
NeilBrowna9701a32005-11-08 21:39:34 -08002113 spin_lock_irq(&mddev->write_lock);
NeilBrown84692192006-08-27 01:23:49 -07002114
NeilBrown850b2b42006-10-03 01:15:46 -07002115 set_bit(MD_CHANGE_PENDING, &mddev->flags);
2116 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
2117 force_change = 1;
2118 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
2119 /* just a clean<-> dirty transition, possibly leave spares alone,
2120 * though if events isn't the right even/odd, we will have to do
2121 * spares after all
2122 */
2123 nospares = 1;
2124 if (force_change)
2125 nospares = 0;
2126 if (mddev->degraded)
NeilBrown84692192006-08-27 01:23:49 -07002127 /* If the array is degraded, then skipping spares is both
2128 * dangerous and fairly pointless.
2129 * Dangerous because a device that was removed from the array
2130 * might have a event_count that still looks up-to-date,
2131 * so it can be re-added without a resync.
2132 * Pointless because if there are any spares to skip,
2133 * then a recovery will happen and soon that array won't
2134 * be degraded any more and the spare can go back to sleep then.
2135 */
NeilBrown850b2b42006-10-03 01:15:46 -07002136 nospares = 0;
NeilBrown84692192006-08-27 01:23:49 -07002137
NeilBrown06d91a52005-06-21 17:17:12 -07002138 sync_req = mddev->in_sync;
NeilBrown42543762006-06-26 00:27:57 -07002139
2140 /* If this is just a dirty<->clean transition, and the array is clean
2141 * and 'events' is odd, we can roll back to the previous clean state */
NeilBrown850b2b42006-10-03 01:15:46 -07002142 if (nospares
NeilBrown42543762006-06-26 00:27:57 -07002143 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
NeilBrown1031be72007-01-26 00:57:02 -08002144 && (mddev->events & 1)
2145 && mddev->events != 1)
NeilBrown42543762006-06-26 00:27:57 -07002146 mddev->events--;
2147 else {
2148 /* otherwise we have to go forward and ... */
2149 mddev->events ++;
2150 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
NeilBrown51d56682009-08-13 09:54:02 +10002151 /* .. if the array isn't clean, an 'even' event must also go
2152 * to spares. */
NeilBrown75a73a22010-05-07 19:44:26 +10002153 if ((mddev->events&1)==0) {
NeilBrown42543762006-06-26 00:27:57 -07002154 nospares = 0;
NeilBrown75a73a22010-05-07 19:44:26 +10002155 sync_req = 2; /* force a second update to get the
2156 * even/odd in sync */
2157 }
NeilBrown42543762006-06-26 00:27:57 -07002158 } else {
NeilBrown51d56682009-08-13 09:54:02 +10002159 /* otherwise an 'odd' event must go to spares */
NeilBrown75a73a22010-05-07 19:44:26 +10002160 if ((mddev->events&1)) {
NeilBrown42543762006-06-26 00:27:57 -07002161 nospares = 0;
NeilBrown75a73a22010-05-07 19:44:26 +10002162 sync_req = 2; /* force a second update to get the
2163 * even/odd in sync */
2164 }
NeilBrown42543762006-06-26 00:27:57 -07002165 }
2166 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167
2168 if (!mddev->events) {
2169 /*
2170 * oops, this 64-bit counter should never wrap.
2171 * Either we are in around ~1 trillion A.C., assuming
2172 * 1 reboot per second, or we have a bug:
2173 */
2174 MD_BUG();
2175 mddev->events --;
2176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177
2178 /*
2179 * do not write anything to disk if using
2180 * nonpersistent superblocks
2181 */
NeilBrown06d91a52005-06-21 17:17:12 -07002182 if (!mddev->persistent) {
NeilBrowne6910632008-02-06 01:39:51 -08002183 if (!mddev->external)
2184 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2185
NeilBrowna9701a32005-11-08 21:39:34 -08002186 spin_unlock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07002187 wake_up(&mddev->sb_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188 return;
NeilBrown06d91a52005-06-21 17:17:12 -07002189 }
NeilBrowne6910632008-02-06 01:39:51 -08002190 sync_sbs(mddev, nospares);
NeilBrowna9701a32005-11-08 21:39:34 -08002191 spin_unlock_irq(&mddev->write_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192
2193 dprintk(KERN_INFO
2194 "md: updating %s RAID superblock on device (in sync %d)\n",
2195 mdname(mddev),mddev->in_sync);
2196
NeilBrown4ad13662007-07-17 04:06:13 -07002197 bitmap_update_sb(mddev->bitmap);
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002198 list_for_each_entry(rdev, &mddev->disks, same_set) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199 char b[BDEVNAME_SIZE];
2200 dprintk(KERN_INFO "md: ");
NeilBrown42543762006-06-26 00:27:57 -07002201 if (rdev->sb_loaded != 1)
2202 continue; /* no noise on spare devices */
NeilBrownb2d444d2005-11-08 21:39:31 -08002203 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204 dprintk("(skipping faulty ");
2205
2206 dprintk("%s ", bdevname(rdev->bdev,b));
NeilBrownb2d444d2005-11-08 21:39:31 -08002207 if (!test_bit(Faulty, &rdev->flags)) {
NeilBrown7bfa19f2005-06-21 17:17:28 -07002208 md_super_write(mddev,rdev,
Andre Noll0f420352008-07-11 22:02:23 +10002209 rdev->sb_start, rdev->sb_size,
NeilBrown7bfa19f2005-06-21 17:17:28 -07002210 rdev->sb_page);
2211 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2212 bdevname(rdev->bdev,b),
Andre Noll0f420352008-07-11 22:02:23 +10002213 (unsigned long long)rdev->sb_start);
NeilBrown42543762006-06-26 00:27:57 -07002214 rdev->sb_events = mddev->events;
NeilBrown7bfa19f2005-06-21 17:17:28 -07002215
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216 } else
2217 dprintk(")\n");
NeilBrown7bfa19f2005-06-21 17:17:28 -07002218 if (mddev->level == LEVEL_MULTIPATH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002219 /* only need to write one superblock... */
2220 break;
2221 }
NeilBrowna9701a32005-11-08 21:39:34 -08002222 md_super_wait(mddev);
NeilBrown850b2b42006-10-03 01:15:46 -07002223 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
NeilBrown7bfa19f2005-06-21 17:17:28 -07002224
NeilBrowna9701a32005-11-08 21:39:34 -08002225 spin_lock_irq(&mddev->write_lock);
NeilBrown850b2b42006-10-03 01:15:46 -07002226 if (mddev->in_sync != sync_req ||
2227 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
NeilBrown06d91a52005-06-21 17:17:12 -07002228 /* have to write it out again */
NeilBrowna9701a32005-11-08 21:39:34 -08002229 spin_unlock_irq(&mddev->write_lock);
NeilBrown06d91a52005-06-21 17:17:12 -07002230 goto repeat;
2231 }
NeilBrown850b2b42006-10-03 01:15:46 -07002232 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
NeilBrowna9701a32005-11-08 21:39:34 -08002233 spin_unlock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07002234 wake_up(&mddev->sb_wait);
NeilBrownacb180b2009-04-14 16:28:34 +10002235 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2236 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
NeilBrown06d91a52005-06-21 17:17:12 -07002237
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238}
2239
Andre Noll7f6ce762008-03-23 18:34:54 +01002240/* words written to sysfs files may, or may not, be \n terminated.
NeilBrownbce74da2006-01-06 00:20:41 -08002241 * We want to accept with case. For this we use cmd_match.
2242 */
2243static int cmd_match(const char *cmd, const char *str)
2244{
2245 /* See if cmd, written into a sysfs file, matches
2246 * str. They must either be the same, or cmd can
2247 * have a trailing newline
2248 */
2249 while (*cmd && *str && *cmd == *str) {
2250 cmd++;
2251 str++;
2252 }
2253 if (*cmd == '\n')
2254 cmd++;
2255 if (*str || *cmd)
2256 return 0;
2257 return 1;
2258}
2259
NeilBrown86e6ffd2005-11-08 21:39:24 -08002260struct rdev_sysfs_entry {
2261 struct attribute attr;
2262 ssize_t (*show)(mdk_rdev_t *, char *);
2263 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2264};
2265
2266static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08002267state_show(mdk_rdev_t *rdev, char *page)
NeilBrown86e6ffd2005-11-08 21:39:24 -08002268{
2269 char *sep = "";
NeilBrown20a49ff2008-02-06 01:39:57 -08002270 size_t len = 0;
NeilBrown86e6ffd2005-11-08 21:39:24 -08002271
NeilBrownb2d444d2005-11-08 21:39:31 -08002272 if (test_bit(Faulty, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08002273 len+= sprintf(page+len, "%sfaulty",sep);
2274 sep = ",";
2275 }
NeilBrownb2d444d2005-11-08 21:39:31 -08002276 if (test_bit(In_sync, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08002277 len += sprintf(page+len, "%sin_sync",sep);
2278 sep = ",";
2279 }
NeilBrownf6556752006-06-26 00:28:01 -07002280 if (test_bit(WriteMostly, &rdev->flags)) {
2281 len += sprintf(page+len, "%swrite_mostly",sep);
2282 sep = ",";
2283 }
Dan Williams6bfe0b42008-04-30 00:52:32 -07002284 if (test_bit(Blocked, &rdev->flags)) {
2285 len += sprintf(page+len, "%sblocked", sep);
2286 sep = ",";
2287 }
NeilBrownb2d444d2005-11-08 21:39:31 -08002288 if (!test_bit(Faulty, &rdev->flags) &&
2289 !test_bit(In_sync, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08002290 len += sprintf(page+len, "%sspare", sep);
2291 sep = ",";
2292 }
2293 return len+sprintf(page+len, "\n");
2294}
2295
NeilBrown45dc2de2006-06-26 00:27:58 -07002296static ssize_t
2297state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2298{
2299 /* can write
2300 * faulty - simulates and error
2301 * remove - disconnects the device
NeilBrownf6556752006-06-26 00:28:01 -07002302 * writemostly - sets write_mostly
2303 * -writemostly - clears write_mostly
Dan Williams6bfe0b42008-04-30 00:52:32 -07002304 * blocked - sets the Blocked flag
2305 * -blocked - clears the Blocked flag
NeilBrown6d56e272009-04-14 12:01:57 +10002306 * insync - sets Insync providing device isn't active
NeilBrown45dc2de2006-06-26 00:27:58 -07002307 */
2308 int err = -EINVAL;
2309 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2310 md_error(rdev->mddev, rdev);
2311 err = 0;
2312 } else if (cmd_match(buf, "remove")) {
2313 if (rdev->raid_disk >= 0)
2314 err = -EBUSY;
2315 else {
2316 mddev_t *mddev = rdev->mddev;
2317 kick_rdev_from_array(rdev);
NeilBrown3f9d7b02006-12-22 01:11:41 -08002318 if (mddev->pers)
2319 md_update_sb(mddev, 1);
NeilBrown45dc2de2006-06-26 00:27:58 -07002320 md_new_event(mddev);
2321 err = 0;
2322 }
NeilBrownf6556752006-06-26 00:28:01 -07002323 } else if (cmd_match(buf, "writemostly")) {
2324 set_bit(WriteMostly, &rdev->flags);
2325 err = 0;
2326 } else if (cmd_match(buf, "-writemostly")) {
2327 clear_bit(WriteMostly, &rdev->flags);
2328 err = 0;
Dan Williams6bfe0b42008-04-30 00:52:32 -07002329 } else if (cmd_match(buf, "blocked")) {
2330 set_bit(Blocked, &rdev->flags);
2331 err = 0;
2332 } else if (cmd_match(buf, "-blocked")) {
2333 clear_bit(Blocked, &rdev->flags);
2334 wake_up(&rdev->blocked_wait);
2335 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2336 md_wakeup_thread(rdev->mddev->thread);
2337
2338 err = 0;
NeilBrown6d56e272009-04-14 12:01:57 +10002339 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2340 set_bit(In_sync, &rdev->flags);
2341 err = 0;
NeilBrown45dc2de2006-06-26 00:27:58 -07002342 }
NeilBrown3c0ee632008-10-21 13:25:28 +11002343 if (!err && rdev->sysfs_state)
2344 sysfs_notify_dirent(rdev->sysfs_state);
NeilBrown45dc2de2006-06-26 00:27:58 -07002345 return err ? err : len;
2346}
NeilBrown80ca3a42006-07-10 04:44:18 -07002347static struct rdev_sysfs_entry rdev_state =
2348__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
NeilBrown86e6ffd2005-11-08 21:39:24 -08002349
2350static ssize_t
NeilBrown4dbcdc72006-01-06 00:20:52 -08002351errors_show(mdk_rdev_t *rdev, char *page)
2352{
2353 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2354}
2355
2356static ssize_t
2357errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2358{
2359 char *e;
2360 unsigned long n = simple_strtoul(buf, &e, 10);
2361 if (*buf && (*e == 0 || *e == '\n')) {
2362 atomic_set(&rdev->corrected_errors, n);
2363 return len;
2364 }
2365 return -EINVAL;
2366}
2367static struct rdev_sysfs_entry rdev_errors =
NeilBrown80ca3a42006-07-10 04:44:18 -07002368__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
NeilBrown4dbcdc72006-01-06 00:20:52 -08002369
NeilBrown014236d2006-01-06 00:20:55 -08002370static ssize_t
2371slot_show(mdk_rdev_t *rdev, char *page)
2372{
2373 if (rdev->raid_disk < 0)
2374 return sprintf(page, "none\n");
2375 else
2376 return sprintf(page, "%d\n", rdev->raid_disk);
2377}
2378
2379static ssize_t
2380slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2381{
2382 char *e;
NeilBrownc303da62008-02-06 01:39:51 -08002383 int err;
2384 char nm[20];
NeilBrown014236d2006-01-06 00:20:55 -08002385 int slot = simple_strtoul(buf, &e, 10);
2386 if (strncmp(buf, "none", 4)==0)
2387 slot = -1;
2388 else if (e==buf || (*e && *e!= '\n'))
2389 return -EINVAL;
Neil Brown6c2fce22008-06-28 08:31:31 +10002390 if (rdev->mddev->pers && slot == -1) {
NeilBrownc303da62008-02-06 01:39:51 -08002391 /* Setting 'slot' on an active array requires also
2392 * updating the 'rd%d' link, and communicating
2393 * with the personality with ->hot_*_disk.
2394 * For now we only support removing
2395 * failed/spare devices. This normally happens automatically,
2396 * but not when the metadata is externally managed.
2397 */
NeilBrownc303da62008-02-06 01:39:51 -08002398 if (rdev->raid_disk == -1)
2399 return -EEXIST;
2400 /* personality does all needed checks */
2401 if (rdev->mddev->pers->hot_add_disk == NULL)
2402 return -EINVAL;
2403 err = rdev->mddev->pers->
2404 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2405 if (err)
2406 return err;
2407 sprintf(nm, "rd%d", rdev->raid_disk);
2408 sysfs_remove_link(&rdev->mddev->kobj, nm);
Maciej Trelab7103102010-04-14 16:58:16 +10002409 rdev->raid_disk = -1;
NeilBrownc303da62008-02-06 01:39:51 -08002410 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2411 md_wakeup_thread(rdev->mddev->thread);
Neil Brown6c2fce22008-06-28 08:31:31 +10002412 } else if (rdev->mddev->pers) {
2413 mdk_rdev_t *rdev2;
Neil Brown6c2fce22008-06-28 08:31:31 +10002414 /* Activating a spare .. or possibly reactivating
NeilBrown6d56e272009-04-14 12:01:57 +10002415 * if we ever get bitmaps working here.
Neil Brown6c2fce22008-06-28 08:31:31 +10002416 */
2417
2418 if (rdev->raid_disk != -1)
2419 return -EBUSY;
2420
2421 if (rdev->mddev->pers->hot_add_disk == NULL)
2422 return -EINVAL;
2423
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002424 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
Neil Brown6c2fce22008-06-28 08:31:31 +10002425 if (rdev2->raid_disk == slot)
2426 return -EEXIST;
2427
2428 rdev->raid_disk = slot;
2429 if (test_bit(In_sync, &rdev->flags))
2430 rdev->saved_raid_disk = slot;
2431 else
2432 rdev->saved_raid_disk = -1;
2433 err = rdev->mddev->pers->
2434 hot_add_disk(rdev->mddev, rdev);
Neil Brown199050e2008-06-28 08:31:33 +10002435 if (err) {
Neil Brown6c2fce22008-06-28 08:31:31 +10002436 rdev->raid_disk = -1;
Neil Brown6c2fce22008-06-28 08:31:31 +10002437 return err;
Neil Brown52664732008-06-28 08:31:44 +10002438 } else
NeilBrown3c0ee632008-10-21 13:25:28 +11002439 sysfs_notify_dirent(rdev->sysfs_state);
Neil Brown6c2fce22008-06-28 08:31:31 +10002440 sprintf(nm, "rd%d", rdev->raid_disk);
2441 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2442 printk(KERN_WARNING
2443 "md: cannot register "
2444 "%s for %s\n",
2445 nm, mdname(rdev->mddev));
2446
2447 /* don't wakeup anyone, leave that to userspace. */
NeilBrownc303da62008-02-06 01:39:51 -08002448 } else {
2449 if (slot >= rdev->mddev->raid_disks)
2450 return -ENOSPC;
2451 rdev->raid_disk = slot;
2452 /* assume it is working */
NeilBrownc5d79ad2008-02-06 01:39:54 -08002453 clear_bit(Faulty, &rdev->flags);
2454 clear_bit(WriteMostly, &rdev->flags);
NeilBrownc303da62008-02-06 01:39:51 -08002455 set_bit(In_sync, &rdev->flags);
NeilBrown3c0ee632008-10-21 13:25:28 +11002456 sysfs_notify_dirent(rdev->sysfs_state);
NeilBrownc303da62008-02-06 01:39:51 -08002457 }
NeilBrown014236d2006-01-06 00:20:55 -08002458 return len;
2459}
2460
2461
2462static struct rdev_sysfs_entry rdev_slot =
NeilBrown80ca3a42006-07-10 04:44:18 -07002463__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
NeilBrown014236d2006-01-06 00:20:55 -08002464
NeilBrown93c8cad2006-01-06 00:20:56 -08002465static ssize_t
2466offset_show(mdk_rdev_t *rdev, char *page)
2467{
Andrew Morton6961ece2006-01-06 00:20:59 -08002468 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
NeilBrown93c8cad2006-01-06 00:20:56 -08002469}
2470
2471static ssize_t
2472offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2473{
2474 char *e;
2475 unsigned long long offset = simple_strtoull(buf, &e, 10);
2476 if (e==buf || (*e && *e != '\n'))
2477 return -EINVAL;
Neil Brown8ed0a522008-06-28 08:31:29 +10002478 if (rdev->mddev->pers && rdev->raid_disk >= 0)
NeilBrown93c8cad2006-01-06 00:20:56 -08002479 return -EBUSY;
Andre Nolldd8ac332009-03-31 14:33:13 +11002480 if (rdev->sectors && rdev->mddev->external)
NeilBrownc5d79ad2008-02-06 01:39:54 -08002481 /* Must set offset before size, so overlap checks
2482 * can be sane */
2483 return -EBUSY;
NeilBrown93c8cad2006-01-06 00:20:56 -08002484 rdev->data_offset = offset;
2485 return len;
2486}
2487
2488static struct rdev_sysfs_entry rdev_offset =
NeilBrown80ca3a42006-07-10 04:44:18 -07002489__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
NeilBrown93c8cad2006-01-06 00:20:56 -08002490
NeilBrown83303b62006-01-06 00:21:06 -08002491static ssize_t
2492rdev_size_show(mdk_rdev_t *rdev, char *page)
2493{
Andre Nolldd8ac332009-03-31 14:33:13 +11002494 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
NeilBrown83303b62006-01-06 00:21:06 -08002495}
2496
NeilBrownc5d79ad2008-02-06 01:39:54 -08002497static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2498{
2499 /* check if two start/length pairs overlap */
2500 if (s1+l1 <= s2)
2501 return 0;
2502 if (s2+l2 <= s1)
2503 return 0;
2504 return 1;
2505}
2506
Dan Williamsb522adc2009-03-31 15:00:31 +11002507static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2508{
2509 unsigned long long blocks;
2510 sector_t new;
2511
2512 if (strict_strtoull(buf, 10, &blocks) < 0)
2513 return -EINVAL;
2514
2515 if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2516 return -EINVAL; /* sector conversion overflow */
2517
2518 new = blocks * 2;
2519 if (new != blocks * 2)
2520 return -EINVAL; /* unsigned long long to sector_t overflow */
2521
2522 *sectors = new;
2523 return 0;
2524}
2525
NeilBrown83303b62006-01-06 00:21:06 -08002526static ssize_t
2527rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2528{
NeilBrown27c529b2008-03-04 14:29:33 -08002529 mddev_t *my_mddev = rdev->mddev;
Andre Nolldd8ac332009-03-31 14:33:13 +11002530 sector_t oldsectors = rdev->sectors;
Dan Williamsb522adc2009-03-31 15:00:31 +11002531 sector_t sectors;
NeilBrown27c529b2008-03-04 14:29:33 -08002532
Dan Williamsb522adc2009-03-31 15:00:31 +11002533 if (strict_blocks_to_sectors(buf, &sectors) < 0)
Neil Brownd7027452008-07-12 10:37:50 +10002534 return -EINVAL;
Chris Webb0cd17fe2008-06-28 08:31:46 +10002535 if (my_mddev->pers && rdev->raid_disk >= 0) {
Neil Brownd7027452008-07-12 10:37:50 +10002536 if (my_mddev->persistent) {
Andre Nolldd8ac332009-03-31 14:33:13 +11002537 sectors = super_types[my_mddev->major_version].
2538 rdev_size_change(rdev, sectors);
2539 if (!sectors)
Chris Webb0cd17fe2008-06-28 08:31:46 +10002540 return -EBUSY;
Andre Nolldd8ac332009-03-31 14:33:13 +11002541 } else if (!sectors)
2542 sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2543 rdev->data_offset;
Chris Webb0cd17fe2008-06-28 08:31:46 +10002544 }
Andre Nolldd8ac332009-03-31 14:33:13 +11002545 if (sectors < my_mddev->dev_sectors)
Chris Webb7d3c6f82008-10-13 11:55:11 +11002546 return -EINVAL; /* component must fit device */
Chris Webb0cd17fe2008-06-28 08:31:46 +10002547
Andre Nolldd8ac332009-03-31 14:33:13 +11002548 rdev->sectors = sectors;
2549 if (sectors > oldsectors && my_mddev->external) {
NeilBrownc5d79ad2008-02-06 01:39:54 -08002550 /* need to check that all other rdevs with the same ->bdev
2551 * do not overlap. We need to unlock the mddev to avoid
Andre Nolldd8ac332009-03-31 14:33:13 +11002552 * a deadlock. We have already changed rdev->sectors, and if
NeilBrownc5d79ad2008-02-06 01:39:54 -08002553 * we have to change it back, we will have the lock again.
2554 */
2555 mddev_t *mddev;
2556 int overlap = 0;
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002557 struct list_head *tmp;
NeilBrownc5d79ad2008-02-06 01:39:54 -08002558
NeilBrown27c529b2008-03-04 14:29:33 -08002559 mddev_unlock(my_mddev);
NeilBrown29ac4aa2008-02-06 01:39:58 -08002560 for_each_mddev(mddev, tmp) {
NeilBrownc5d79ad2008-02-06 01:39:54 -08002561 mdk_rdev_t *rdev2;
2562
2563 mddev_lock(mddev);
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002564 list_for_each_entry(rdev2, &mddev->disks, same_set)
NeilBrownc5d79ad2008-02-06 01:39:54 -08002565 if (test_bit(AllReserved, &rdev2->flags) ||
2566 (rdev->bdev == rdev2->bdev &&
2567 rdev != rdev2 &&
Andre Nolldd8ac332009-03-31 14:33:13 +11002568 overlaps(rdev->data_offset, rdev->sectors,
Andre Nolld07bd3b2008-07-21 14:42:07 +10002569 rdev2->data_offset,
Andre Nolldd8ac332009-03-31 14:33:13 +11002570 rdev2->sectors))) {
NeilBrownc5d79ad2008-02-06 01:39:54 -08002571 overlap = 1;
2572 break;
2573 }
2574 mddev_unlock(mddev);
2575 if (overlap) {
2576 mddev_put(mddev);
2577 break;
2578 }
2579 }
NeilBrown27c529b2008-03-04 14:29:33 -08002580 mddev_lock(my_mddev);
NeilBrownc5d79ad2008-02-06 01:39:54 -08002581 if (overlap) {
2582 /* Someone else could have slipped in a size
2583 * change here, but doing so is just silly.
Andre Nolldd8ac332009-03-31 14:33:13 +11002584 * We put oldsectors back because we *know* it is
NeilBrownc5d79ad2008-02-06 01:39:54 -08002585 * safe, and trust userspace not to race with
2586 * itself
2587 */
Andre Nolldd8ac332009-03-31 14:33:13 +11002588 rdev->sectors = oldsectors;
NeilBrownc5d79ad2008-02-06 01:39:54 -08002589 return -EBUSY;
2590 }
2591 }
NeilBrown83303b62006-01-06 00:21:06 -08002592 return len;
2593}
2594
2595static struct rdev_sysfs_entry rdev_size =
NeilBrown80ca3a42006-07-10 04:44:18 -07002596__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
NeilBrown83303b62006-01-06 00:21:06 -08002597
Dan Williams06e3c812009-12-12 21:17:12 -07002598
2599static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page)
2600{
2601 unsigned long long recovery_start = rdev->recovery_offset;
2602
2603 if (test_bit(In_sync, &rdev->flags) ||
2604 recovery_start == MaxSector)
2605 return sprintf(page, "none\n");
2606
2607 return sprintf(page, "%llu\n", recovery_start);
2608}
2609
2610static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2611{
2612 unsigned long long recovery_start;
2613
2614 if (cmd_match(buf, "none"))
2615 recovery_start = MaxSector;
2616 else if (strict_strtoull(buf, 10, &recovery_start))
2617 return -EINVAL;
2618
2619 if (rdev->mddev->pers &&
2620 rdev->raid_disk >= 0)
2621 return -EBUSY;
2622
2623 rdev->recovery_offset = recovery_start;
2624 if (recovery_start == MaxSector)
2625 set_bit(In_sync, &rdev->flags);
2626 else
2627 clear_bit(In_sync, &rdev->flags);
2628 return len;
2629}
2630
2631static struct rdev_sysfs_entry rdev_recovery_start =
2632__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
2633
NeilBrown86e6ffd2005-11-08 21:39:24 -08002634static struct attribute *rdev_default_attrs[] = {
2635 &rdev_state.attr,
NeilBrown4dbcdc72006-01-06 00:20:52 -08002636 &rdev_errors.attr,
NeilBrown014236d2006-01-06 00:20:55 -08002637 &rdev_slot.attr,
NeilBrown93c8cad2006-01-06 00:20:56 -08002638 &rdev_offset.attr,
NeilBrown83303b62006-01-06 00:21:06 -08002639 &rdev_size.attr,
Dan Williams06e3c812009-12-12 21:17:12 -07002640 &rdev_recovery_start.attr,
NeilBrown86e6ffd2005-11-08 21:39:24 -08002641 NULL,
2642};
2643static ssize_t
2644rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2645{
2646 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2647 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
NeilBrown27c529b2008-03-04 14:29:33 -08002648 mddev_t *mddev = rdev->mddev;
2649 ssize_t rv;
NeilBrown86e6ffd2005-11-08 21:39:24 -08002650
2651 if (!entry->show)
2652 return -EIO;
NeilBrown27c529b2008-03-04 14:29:33 -08002653
2654 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2655 if (!rv) {
2656 if (rdev->mddev == NULL)
2657 rv = -EBUSY;
2658 else
2659 rv = entry->show(rdev, page);
2660 mddev_unlock(mddev);
2661 }
2662 return rv;
NeilBrown86e6ffd2005-11-08 21:39:24 -08002663}
2664
2665static ssize_t
2666rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2667 const char *page, size_t length)
2668{
2669 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2670 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
NeilBrown27c529b2008-03-04 14:29:33 -08002671 ssize_t rv;
2672 mddev_t *mddev = rdev->mddev;
NeilBrown86e6ffd2005-11-08 21:39:24 -08002673
2674 if (!entry->store)
2675 return -EIO;
NeilBrown67463ac2006-07-10 04:44:19 -07002676 if (!capable(CAP_SYS_ADMIN))
2677 return -EACCES;
NeilBrown27c529b2008-03-04 14:29:33 -08002678 rv = mddev ? mddev_lock(mddev): -EBUSY;
NeilBrownca388052008-02-06 01:39:55 -08002679 if (!rv) {
NeilBrown27c529b2008-03-04 14:29:33 -08002680 if (rdev->mddev == NULL)
2681 rv = -EBUSY;
2682 else
2683 rv = entry->store(rdev, page, length);
Dan Williams6a518302008-04-30 00:52:28 -07002684 mddev_unlock(mddev);
NeilBrownca388052008-02-06 01:39:55 -08002685 }
2686 return rv;
NeilBrown86e6ffd2005-11-08 21:39:24 -08002687}
2688
2689static void rdev_free(struct kobject *ko)
2690{
2691 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2692 kfree(rdev);
2693}
2694static struct sysfs_ops rdev_sysfs_ops = {
2695 .show = rdev_attr_show,
2696 .store = rdev_attr_store,
2697};
2698static struct kobj_type rdev_ktype = {
2699 .release = rdev_free,
2700 .sysfs_ops = &rdev_sysfs_ops,
2701 .default_attrs = rdev_default_attrs,
2702};
2703
Linus Torvalds1da177e2005-04-16 15:20:36 -07002704/*
2705 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2706 *
2707 * mark the device faulty if:
2708 *
2709 * - the device is nonexistent (zero size)
2710 * - the device has no valid superblock
2711 *
2712 * a faulty rdev _never_ has rdev->sb set.
2713 */
2714static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2715{
2716 char b[BDEVNAME_SIZE];
2717 int err;
2718 mdk_rdev_t *rdev;
2719 sector_t size;
2720
NeilBrown9ffae0c2006-01-06 00:20:32 -08002721 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002722 if (!rdev) {
2723 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2724 return ERR_PTR(-ENOMEM);
2725 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002726
2727 if ((err = alloc_disk_sb(rdev)))
2728 goto abort_free;
2729
NeilBrownc5d79ad2008-02-06 01:39:54 -08002730 err = lock_rdev(rdev, newdev, super_format == -2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002731 if (err)
2732 goto abort_free;
2733
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -07002734 kobject_init(&rdev->kobj, &rdev_ktype);
NeilBrown86e6ffd2005-11-08 21:39:24 -08002735
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736 rdev->desc_nr = -1;
NeilBrown2b6e8452006-10-28 10:38:30 -07002737 rdev->saved_raid_disk = -1;
NeilBrown3f9d7b02006-12-22 01:11:41 -08002738 rdev->raid_disk = -1;
NeilBrownb2d444d2005-11-08 21:39:31 -08002739 rdev->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002740 rdev->data_offset = 0;
NeilBrown42543762006-06-26 00:27:57 -07002741 rdev->sb_events = 0;
Robert Becker1e509152009-12-14 12:49:58 +11002742 rdev->last_read_error.tv_sec = 0;
2743 rdev->last_read_error.tv_nsec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002744 atomic_set(&rdev->nr_pending, 0);
NeilBrownba22dcb2005-11-08 21:39:31 -08002745 atomic_set(&rdev->read_errors, 0);
NeilBrown4dbcdc72006-01-06 00:20:52 -08002746 atomic_set(&rdev->corrected_errors, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002747
2748 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2749 if (!size) {
2750 printk(KERN_WARNING
2751 "md: %s has zero or unknown size, marking faulty!\n",
2752 bdevname(rdev->bdev,b));
2753 err = -EINVAL;
2754 goto abort_free;
2755 }
2756
2757 if (super_format >= 0) {
2758 err = super_types[super_format].
2759 load_super(rdev, NULL, super_minor);
2760 if (err == -EINVAL) {
NeilBrowndf968c42007-07-17 04:06:11 -07002761 printk(KERN_WARNING
2762 "md: %s does not have a valid v%d.%d "
2763 "superblock, not importing!\n",
2764 bdevname(rdev->bdev,b),
2765 super_format, super_minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002766 goto abort_free;
2767 }
2768 if (err < 0) {
2769 printk(KERN_WARNING
2770 "md: could not read %s's sb, not importing!\n",
2771 bdevname(rdev->bdev,b));
2772 goto abort_free;
2773 }
2774 }
Dan Williams6bfe0b42008-04-30 00:52:32 -07002775
Linus Torvalds1da177e2005-04-16 15:20:36 -07002776 INIT_LIST_HEAD(&rdev->same_set);
Dan Williams6bfe0b42008-04-30 00:52:32 -07002777 init_waitqueue_head(&rdev->blocked_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002778
2779 return rdev;
2780
2781abort_free:
2782 if (rdev->sb_page) {
2783 if (rdev->bdev)
2784 unlock_rdev(rdev);
2785 free_disk_sb(rdev);
2786 }
2787 kfree(rdev);
2788 return ERR_PTR(err);
2789}
2790
2791/*
2792 * Check a full RAID array for plausibility
2793 */
2794
2795
NeilBrowna757e642005-04-16 15:26:42 -07002796static void analyze_sbs(mddev_t * mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797{
2798 int i;
Cheng Renquan159ec1f2009-01-09 08:31:08 +11002799 mdk_rdev_t *rdev, *freshest, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002800 char b[BDEVNAME_SIZE];
2801
2802 freshest = NULL;
NeilBrownd089c6a2008-02-06 01:39:59 -08002803 rdev_for_each(rdev, tmp, mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002804 switch (super_types[mddev->major_version].
2805 load_super(rdev, freshest, mddev->minor_version)) {
2806 case 1:
2807 freshest = rdev;
2808 break;
2809 case 0:
2810 break;
2811 default:
2812 printk( KERN_ERR \
2813 "md: fatal superblock inconsistency in %s"
2814 " -- removing from array\n",
2815 bdevname(rdev->bdev,b));
2816 kick_rdev_from_array(rdev);
2817 }
2818
2819
2820 super_types[mddev->major_version].
2821 validate_super(mddev, freshest);
2822
2823 i = 0;
NeilBrownd089c6a2008-02-06 01:39:59 -08002824 rdev_for_each(rdev, tmp, mddev) {
NeilBrown233fca32010-04-14 17:02:09 +10002825 if (mddev->max_disks &&
2826 (rdev->desc_nr >= mddev->max_disks ||
2827 i > mddev->max_disks)) {
NeilBrownde01dfa2009-02-06 18:02:46 +11002828 printk(KERN_WARNING
2829 "md: %s: %s: only %d devices permitted\n",
2830 mdname(mddev), bdevname(rdev->bdev, b),
2831 mddev->max_disks);
2832 kick_rdev_from_array(rdev);
2833 continue;
2834 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002835 if (rdev != freshest)
2836 if (super_types[mddev->major_version].
2837 validate_super(mddev, rdev)) {
2838 printk(KERN_WARNING "md: kicking non-fresh %s"
2839 " from array!\n",
2840 bdevname(rdev->bdev,b));
2841 kick_rdev_from_array(rdev);
2842 continue;
2843 }
2844 if (mddev->level == LEVEL_MULTIPATH) {
2845 rdev->desc_nr = i++;
2846 rdev->raid_disk = rdev->desc_nr;
NeilBrownb2d444d2005-11-08 21:39:31 -08002847 set_bit(In_sync, &rdev->flags);
NeilBrown5e5e3e72009-10-16 16:35:30 +11002848 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
NeilBrowna778b732007-05-23 13:58:10 -07002849 rdev->raid_disk = -1;
2850 clear_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002851 }
2852 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002853}
2854
NeilBrown72e02072009-12-14 12:49:55 +11002855/* Read a fixed-point number.
2856 * Numbers in sysfs attributes should be in "standard" units where
2857 * possible, so time should be in seconds.
2858 * However we internally use a a much smaller unit such as
2859 * milliseconds or jiffies.
2860 * This function takes a decimal number with a possible fractional
2861 * component, and produces an integer which is the result of
2862 * multiplying that number by 10^'scale'.
2863 * all without any floating-point arithmetic.
2864 */
2865int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
2866{
2867 unsigned long result = 0;
2868 long decimals = -1;
2869 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
2870 if (*cp == '.')
2871 decimals = 0;
2872 else if (decimals < scale) {
2873 unsigned int value;
2874 value = *cp - '0';
2875 result = result * 10 + value;
2876 if (decimals >= 0)
2877 decimals++;
2878 }
2879 cp++;
2880 }
2881 if (*cp == '\n')
2882 cp++;
2883 if (*cp)
2884 return -EINVAL;
2885 if (decimals < 0)
2886 decimals = 0;
2887 while (decimals < scale) {
2888 result *= 10;
2889 decimals ++;
2890 }
2891 *res = result;
2892 return 0;
2893}
2894
2895
NeilBrown19052c02008-08-05 15:54:13 +10002896static void md_safemode_timeout(unsigned long data);
2897
NeilBrowneae17012005-11-08 21:39:23 -08002898static ssize_t
NeilBrown16f17b32006-06-26 00:27:37 -07002899safe_delay_show(mddev_t *mddev, char *page)
2900{
2901 int msec = (mddev->safemode_delay*1000)/HZ;
2902 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2903}
2904static ssize_t
2905safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2906{
NeilBrown16f17b32006-06-26 00:27:37 -07002907 unsigned long msec;
Dan Williams97ce0a72008-09-24 22:48:19 -07002908
NeilBrown72e02072009-12-14 12:49:55 +11002909 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
NeilBrown16f17b32006-06-26 00:27:37 -07002910 return -EINVAL;
NeilBrown16f17b32006-06-26 00:27:37 -07002911 if (msec == 0)
2912 mddev->safemode_delay = 0;
2913 else {
NeilBrown19052c02008-08-05 15:54:13 +10002914 unsigned long old_delay = mddev->safemode_delay;
NeilBrown16f17b32006-06-26 00:27:37 -07002915 mddev->safemode_delay = (msec*HZ)/1000;
2916 if (mddev->safemode_delay == 0)
2917 mddev->safemode_delay = 1;
NeilBrown19052c02008-08-05 15:54:13 +10002918 if (mddev->safemode_delay < old_delay)
2919 md_safemode_timeout((unsigned long)mddev);
NeilBrown16f17b32006-06-26 00:27:37 -07002920 }
2921 return len;
2922}
2923static struct md_sysfs_entry md_safe_delay =
NeilBrown80ca3a42006-07-10 04:44:18 -07002924__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
NeilBrown16f17b32006-06-26 00:27:37 -07002925
2926static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08002927level_show(mddev_t *mddev, char *page)
NeilBrowneae17012005-11-08 21:39:23 -08002928{
NeilBrown2604b702006-01-06 00:20:36 -08002929 struct mdk_personality *p = mddev->pers;
NeilBrownd9d166c2006-01-06 00:20:51 -08002930 if (p)
NeilBrowneae17012005-11-08 21:39:23 -08002931 return sprintf(page, "%s\n", p->name);
NeilBrownd9d166c2006-01-06 00:20:51 -08002932 else if (mddev->clevel[0])
2933 return sprintf(page, "%s\n", mddev->clevel);
2934 else if (mddev->level != LEVEL_NONE)
2935 return sprintf(page, "%d\n", mddev->level);
2936 else
2937 return 0;
NeilBrowneae17012005-11-08 21:39:23 -08002938}
2939
NeilBrownd9d166c2006-01-06 00:20:51 -08002940static ssize_t
2941level_store(mddev_t *mddev, const char *buf, size_t len)
2942{
Dan Williamsf2859af2010-05-02 10:04:16 -07002943 char clevel[16];
NeilBrown20a49ff2008-02-06 01:39:57 -08002944 ssize_t rv = len;
NeilBrown245f46c2009-03-31 14:39:39 +11002945 struct mdk_personality *pers;
Dan Williamsf2859af2010-05-02 10:04:16 -07002946 long level;
NeilBrown245f46c2009-03-31 14:39:39 +11002947 void *priv;
NeilBrown3a981b02009-08-03 10:59:55 +10002948 mdk_rdev_t *rdev;
NeilBrown245f46c2009-03-31 14:39:39 +11002949
2950 if (mddev->pers == NULL) {
2951 if (len == 0)
2952 return 0;
2953 if (len >= sizeof(mddev->clevel))
2954 return -ENOSPC;
2955 strncpy(mddev->clevel, buf, len);
2956 if (mddev->clevel[len-1] == '\n')
2957 len--;
2958 mddev->clevel[len] = 0;
2959 mddev->level = LEVEL_NONE;
2960 return rv;
2961 }
2962
2963 /* request to change the personality. Need to ensure:
2964 * - array is not engaged in resync/recovery/reshape
2965 * - old personality can be suspended
2966 * - new personality will access other array.
2967 */
2968
2969 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
NeilBrownd9d166c2006-01-06 00:20:51 -08002970 return -EBUSY;
NeilBrown245f46c2009-03-31 14:39:39 +11002971
2972 if (!mddev->pers->quiesce) {
2973 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2974 mdname(mddev), mddev->pers->name);
2975 return -EINVAL;
2976 }
2977
2978 /* Now find the new personality */
Dan Williamsf2859af2010-05-02 10:04:16 -07002979 if (len == 0 || len >= sizeof(clevel))
NeilBrown245f46c2009-03-31 14:39:39 +11002980 return -EINVAL;
Dan Williamsf2859af2010-05-02 10:04:16 -07002981 strncpy(clevel, buf, len);
2982 if (clevel[len-1] == '\n')
NeilBrownd9d166c2006-01-06 00:20:51 -08002983 len--;
Dan Williamsf2859af2010-05-02 10:04:16 -07002984 clevel[len] = 0;
2985 if (strict_strtol(clevel, 10, &level))
2986 level = LEVEL_NONE;
NeilBrown245f46c2009-03-31 14:39:39 +11002987
Dan Williamsf2859af2010-05-02 10:04:16 -07002988 if (request_module("md-%s", clevel) != 0)
2989 request_module("md-level-%s", clevel);
NeilBrown245f46c2009-03-31 14:39:39 +11002990 spin_lock(&pers_lock);
Dan Williamsf2859af2010-05-02 10:04:16 -07002991 pers = find_pers(level, clevel);
NeilBrown245f46c2009-03-31 14:39:39 +11002992 if (!pers || !try_module_get(pers->owner)) {
2993 spin_unlock(&pers_lock);
Dan Williamsf2859af2010-05-02 10:04:16 -07002994 printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
NeilBrown245f46c2009-03-31 14:39:39 +11002995 return -EINVAL;
2996 }
2997 spin_unlock(&pers_lock);
2998
2999 if (pers == mddev->pers) {
3000 /* Nothing to do! */
3001 module_put(pers->owner);
3002 return rv;
3003 }
3004 if (!pers->takeover) {
3005 module_put(pers->owner);
3006 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
Dan Williamsf2859af2010-05-02 10:04:16 -07003007 mdname(mddev), clevel);
NeilBrown245f46c2009-03-31 14:39:39 +11003008 return -EINVAL;
3009 }
3010
3011 /* ->takeover must set new_* and/or delta_disks
3012 * if it succeeds, and may set them when it fails.
3013 */
3014 priv = pers->takeover(mddev);
3015 if (IS_ERR(priv)) {
3016 mddev->new_level = mddev->level;
3017 mddev->new_layout = mddev->layout;
Andre Noll664e7c42009-06-18 08:45:27 +10003018 mddev->new_chunk_sectors = mddev->chunk_sectors;
NeilBrown245f46c2009-03-31 14:39:39 +11003019 mddev->raid_disks -= mddev->delta_disks;
3020 mddev->delta_disks = 0;
3021 module_put(pers->owner);
3022 printk(KERN_WARNING "md: %s: %s would not accept array\n",
Dan Williamsf2859af2010-05-02 10:04:16 -07003023 mdname(mddev), clevel);
NeilBrown245f46c2009-03-31 14:39:39 +11003024 return PTR_ERR(priv);
3025 }
3026
3027 /* Looks like we have a winner */
3028 mddev_suspend(mddev);
3029 mddev->pers->stop(mddev);
NeilBrowna64c8762010-04-14 17:15:37 +10003030
3031 if (mddev->pers->sync_request == NULL &&
3032 pers->sync_request != NULL) {
3033 /* need to add the md_redundancy_group */
3034 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3035 printk(KERN_WARNING
3036 "md: cannot register extra attributes for %s\n",
3037 mdname(mddev));
3038 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3039 }
3040 if (mddev->pers->sync_request != NULL &&
3041 pers->sync_request == NULL) {
3042 /* need to remove the md_redundancy_group */
3043 if (mddev->to_remove == NULL)
3044 mddev->to_remove = &md_redundancy_group;
3045 }
3046
Trela Maciej54071b32010-03-08 16:02:42 +11003047 if (mddev->pers->sync_request == NULL &&
3048 mddev->external) {
3049 /* We are converting from a no-redundancy array
3050 * to a redundancy array and metadata is managed
3051 * externally so we need to be sure that writes
3052 * won't block due to a need to transition
3053 * clean->dirty
3054 * until external management is started.
3055 */
3056 mddev->in_sync = 0;
3057 mddev->safemode_delay = 0;
3058 mddev->safemode = 0;
3059 }
3060
NeilBrown245f46c2009-03-31 14:39:39 +11003061 module_put(mddev->pers->owner);
NeilBrown3a981b02009-08-03 10:59:55 +10003062 /* Invalidate devices that are now superfluous */
3063 list_for_each_entry(rdev, &mddev->disks, same_set)
3064 if (rdev->raid_disk >= mddev->raid_disks) {
3065 rdev->raid_disk = -1;
3066 clear_bit(In_sync, &rdev->flags);
3067 }
NeilBrown245f46c2009-03-31 14:39:39 +11003068 mddev->pers = pers;
3069 mddev->private = priv;
3070 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3071 mddev->level = mddev->new_level;
3072 mddev->layout = mddev->new_layout;
Andre Noll664e7c42009-06-18 08:45:27 +10003073 mddev->chunk_sectors = mddev->new_chunk_sectors;
NeilBrown245f46c2009-03-31 14:39:39 +11003074 mddev->delta_disks = 0;
Trela, Maciej9af204c2010-03-08 16:02:44 +11003075 if (mddev->pers->sync_request == NULL) {
3076 /* this is now an array without redundancy, so
3077 * it must always be in_sync
3078 */
3079 mddev->in_sync = 1;
3080 del_timer_sync(&mddev->safemode_timer);
3081 }
NeilBrown245f46c2009-03-31 14:39:39 +11003082 pers->run(mddev);
3083 mddev_resume(mddev);
3084 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3085 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3086 md_wakeup_thread(mddev->thread);
Maciej Trela5cac78612010-04-14 17:17:39 +10003087 sysfs_notify(&mddev->kobj, NULL, "level");
Dan Williamsbb7f8d22010-05-01 18:14:57 -07003088 md_new_event(mddev);
NeilBrownd9d166c2006-01-06 00:20:51 -08003089 return rv;
3090}
3091
3092static struct md_sysfs_entry md_level =
NeilBrown80ca3a42006-07-10 04:44:18 -07003093__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
NeilBrowneae17012005-11-08 21:39:23 -08003094
NeilBrownd4dbd022006-06-26 00:27:59 -07003095
3096static ssize_t
3097layout_show(mddev_t *mddev, char *page)
3098{
3099 /* just a number, not meaningful for all levels */
NeilBrown08a02ec2007-05-09 02:35:38 -07003100 if (mddev->reshape_position != MaxSector &&
3101 mddev->layout != mddev->new_layout)
3102 return sprintf(page, "%d (%d)\n",
3103 mddev->new_layout, mddev->layout);
NeilBrownd4dbd022006-06-26 00:27:59 -07003104 return sprintf(page, "%d\n", mddev->layout);
3105}
3106
3107static ssize_t
3108layout_store(mddev_t *mddev, const char *buf, size_t len)
3109{
3110 char *e;
3111 unsigned long n = simple_strtoul(buf, &e, 10);
NeilBrownd4dbd022006-06-26 00:27:59 -07003112
3113 if (!*buf || (*e && *e != '\n'))
3114 return -EINVAL;
3115
NeilBrownb3546032009-03-31 14:56:41 +11003116 if (mddev->pers) {
3117 int err;
NeilBrown50ac1682009-06-18 08:47:55 +10003118 if (mddev->pers->check_reshape == NULL)
NeilBrownb3546032009-03-31 14:56:41 +11003119 return -EBUSY;
NeilBrown597a7112009-06-18 08:47:42 +10003120 mddev->new_layout = n;
NeilBrown50ac1682009-06-18 08:47:55 +10003121 err = mddev->pers->check_reshape(mddev);
NeilBrown597a7112009-06-18 08:47:42 +10003122 if (err) {
3123 mddev->new_layout = mddev->layout;
NeilBrownb3546032009-03-31 14:56:41 +11003124 return err;
NeilBrown597a7112009-06-18 08:47:42 +10003125 }
NeilBrownb3546032009-03-31 14:56:41 +11003126 } else {
NeilBrown08a02ec2007-05-09 02:35:38 -07003127 mddev->new_layout = n;
NeilBrownb3546032009-03-31 14:56:41 +11003128 if (mddev->reshape_position == MaxSector)
3129 mddev->layout = n;
3130 }
NeilBrownd4dbd022006-06-26 00:27:59 -07003131 return len;
3132}
3133static struct md_sysfs_entry md_layout =
NeilBrown80ca3a42006-07-10 04:44:18 -07003134__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
NeilBrownd4dbd022006-06-26 00:27:59 -07003135
3136
NeilBrowneae17012005-11-08 21:39:23 -08003137static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08003138raid_disks_show(mddev_t *mddev, char *page)
NeilBrowneae17012005-11-08 21:39:23 -08003139{
NeilBrownbb636542005-11-08 21:39:45 -08003140 if (mddev->raid_disks == 0)
3141 return 0;
NeilBrown08a02ec2007-05-09 02:35:38 -07003142 if (mddev->reshape_position != MaxSector &&
3143 mddev->delta_disks != 0)
3144 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
3145 mddev->raid_disks - mddev->delta_disks);
NeilBrowneae17012005-11-08 21:39:23 -08003146 return sprintf(page, "%d\n", mddev->raid_disks);
3147}
3148
NeilBrownda943b992006-01-06 00:20:54 -08003149static int update_raid_disks(mddev_t *mddev, int raid_disks);
3150
3151static ssize_t
3152raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
3153{
NeilBrownda943b992006-01-06 00:20:54 -08003154 char *e;
3155 int rv = 0;
3156 unsigned long n = simple_strtoul(buf, &e, 10);
3157
3158 if (!*buf || (*e && *e != '\n'))
3159 return -EINVAL;
3160
3161 if (mddev->pers)
3162 rv = update_raid_disks(mddev, n);
NeilBrown08a02ec2007-05-09 02:35:38 -07003163 else if (mddev->reshape_position != MaxSector) {
3164 int olddisks = mddev->raid_disks - mddev->delta_disks;
3165 mddev->delta_disks = n - olddisks;
3166 mddev->raid_disks = n;
3167 } else
NeilBrownda943b992006-01-06 00:20:54 -08003168 mddev->raid_disks = n;
3169 return rv ? rv : len;
3170}
3171static struct md_sysfs_entry md_raid_disks =
NeilBrown80ca3a42006-07-10 04:44:18 -07003172__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
NeilBrowneae17012005-11-08 21:39:23 -08003173
NeilBrown24dd4692005-11-08 21:39:26 -08003174static ssize_t
NeilBrown3b343802006-01-06 00:20:47 -08003175chunk_size_show(mddev_t *mddev, char *page)
3176{
NeilBrown08a02ec2007-05-09 02:35:38 -07003177 if (mddev->reshape_position != MaxSector &&
Andre Noll664e7c42009-06-18 08:45:27 +10003178 mddev->chunk_sectors != mddev->new_chunk_sectors)
3179 return sprintf(page, "%d (%d)\n",
3180 mddev->new_chunk_sectors << 9,
Andre Noll9d8f0362009-06-18 08:45:01 +10003181 mddev->chunk_sectors << 9);
3182 return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
NeilBrown3b343802006-01-06 00:20:47 -08003183}
3184
3185static ssize_t
3186chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
3187{
NeilBrown3b343802006-01-06 00:20:47 -08003188 char *e;
3189 unsigned long n = simple_strtoul(buf, &e, 10);
3190
NeilBrown3b343802006-01-06 00:20:47 -08003191 if (!*buf || (*e && *e != '\n'))
3192 return -EINVAL;
3193
NeilBrownb3546032009-03-31 14:56:41 +11003194 if (mddev->pers) {
3195 int err;
NeilBrown50ac1682009-06-18 08:47:55 +10003196 if (mddev->pers->check_reshape == NULL)
NeilBrownb3546032009-03-31 14:56:41 +11003197 return -EBUSY;
NeilBrown597a7112009-06-18 08:47:42 +10003198 mddev->new_chunk_sectors = n >> 9;
NeilBrown50ac1682009-06-18 08:47:55 +10003199 err = mddev->pers->check_reshape(mddev);
NeilBrown597a7112009-06-18 08:47:42 +10003200 if (err) {
3201 mddev->new_chunk_sectors = mddev->chunk_sectors;
NeilBrownb3546032009-03-31 14:56:41 +11003202 return err;
NeilBrown597a7112009-06-18 08:47:42 +10003203 }
NeilBrownb3546032009-03-31 14:56:41 +11003204 } else {
Andre Noll664e7c42009-06-18 08:45:27 +10003205 mddev->new_chunk_sectors = n >> 9;
NeilBrownb3546032009-03-31 14:56:41 +11003206 if (mddev->reshape_position == MaxSector)
Andre Noll9d8f0362009-06-18 08:45:01 +10003207 mddev->chunk_sectors = n >> 9;
NeilBrownb3546032009-03-31 14:56:41 +11003208 }
NeilBrown3b343802006-01-06 00:20:47 -08003209 return len;
3210}
3211static struct md_sysfs_entry md_chunk_size =
NeilBrown80ca3a42006-07-10 04:44:18 -07003212__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
NeilBrown3b343802006-01-06 00:20:47 -08003213
NeilBrowna94213b2006-06-26 00:28:00 -07003214static ssize_t
3215resync_start_show(mddev_t *mddev, char *page)
3216{
NeilBrownd1a7c502009-03-31 15:24:32 +11003217 if (mddev->recovery_cp == MaxSector)
3218 return sprintf(page, "none\n");
NeilBrowna94213b2006-06-26 00:28:00 -07003219 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
3220}
3221
3222static ssize_t
3223resync_start_store(mddev_t *mddev, const char *buf, size_t len)
3224{
NeilBrowna94213b2006-06-26 00:28:00 -07003225 char *e;
3226 unsigned long long n = simple_strtoull(buf, &e, 10);
3227
3228 if (mddev->pers)
3229 return -EBUSY;
Dan Williams06e3c812009-12-12 21:17:12 -07003230 if (cmd_match(buf, "none"))
3231 n = MaxSector;
3232 else if (!*buf || (*e && *e != '\n'))
NeilBrowna94213b2006-06-26 00:28:00 -07003233 return -EINVAL;
3234
3235 mddev->recovery_cp = n;
3236 return len;
3237}
3238static struct md_sysfs_entry md_resync_start =
NeilBrown80ca3a42006-07-10 04:44:18 -07003239__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
NeilBrowna94213b2006-06-26 00:28:00 -07003240
NeilBrown9e653b62006-06-26 00:27:58 -07003241/*
3242 * The array state can be:
3243 *
3244 * clear
3245 * No devices, no size, no level
3246 * Equivalent to STOP_ARRAY ioctl
3247 * inactive
3248 * May have some settings, but array is not active
3249 * all IO results in error
3250 * When written, doesn't tear down array, but just stops it
3251 * suspended (not supported yet)
3252 * All IO requests will block. The array can be reconfigured.
Andre Noll910d8cb2008-03-25 21:00:53 +01003253 * Writing this, if accepted, will block until array is quiescent
NeilBrown9e653b62006-06-26 00:27:58 -07003254 * readonly
3255 * no resync can happen. no superblocks get written.
3256 * write requests fail
3257 * read-auto
3258 * like readonly, but behaves like 'clean' on a write request.
3259 *
3260 * clean - no pending writes, but otherwise active.
3261 * When written to inactive array, starts without resync
3262 * If a write request arrives then
3263 * if metadata is known, mark 'dirty' and switch to 'active'.
3264 * if not known, block and switch to write-pending
3265 * If written to an active array that has pending writes, then fails.
3266 * active
3267 * fully active: IO and resync can be happening.
3268 * When written to inactive array, starts with resync
3269 *
3270 * write-pending
3271 * clean, but writes are blocked waiting for 'active' to be written.
3272 *
3273 * active-idle
3274 * like active, but no writes have been seen for a while (100msec).
3275 *
3276 */
3277enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3278 write_pending, active_idle, bad_word};
Adrian Bunk05381952006-06-26 00:28:01 -07003279static char *array_states[] = {
NeilBrown9e653b62006-06-26 00:27:58 -07003280 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3281 "write-pending", "active-idle", NULL };
3282
3283static int match_word(const char *word, char **list)
3284{
3285 int n;
3286 for (n=0; list[n]; n++)
3287 if (cmd_match(word, list[n]))
3288 break;
3289 return n;
3290}
3291
3292static ssize_t
3293array_state_show(mddev_t *mddev, char *page)
3294{
3295 enum array_state st = inactive;
3296
3297 if (mddev->pers)
3298 switch(mddev->ro) {
3299 case 1:
3300 st = readonly;
3301 break;
3302 case 2:
3303 st = read_auto;
3304 break;
3305 case 0:
3306 if (mddev->in_sync)
3307 st = clean;
NeilBrowne6910632008-02-06 01:39:51 -08003308 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3309 st = write_pending;
NeilBrown9e653b62006-06-26 00:27:58 -07003310 else if (mddev->safemode)
3311 st = active_idle;
3312 else
3313 st = active;
3314 }
3315 else {
3316 if (list_empty(&mddev->disks) &&
3317 mddev->raid_disks == 0 &&
Andre Noll58c0fed2009-03-31 14:33:13 +11003318 mddev->dev_sectors == 0)
NeilBrown9e653b62006-06-26 00:27:58 -07003319 st = clear;
3320 else
3321 st = inactive;
3322 }
3323 return sprintf(page, "%s\n", array_states[st]);
3324}
3325
Neil Browndf5b20c2008-07-11 22:02:22 +10003326static int do_md_stop(mddev_t * mddev, int ro, int is_open);
NeilBrowna4bd82d2010-03-29 13:23:10 +11003327static int md_set_readonly(mddev_t * mddev, int is_open);
NeilBrown9e653b62006-06-26 00:27:58 -07003328static int do_md_run(mddev_t * mddev);
3329static int restart_array(mddev_t *mddev);
3330
3331static ssize_t
3332array_state_store(mddev_t *mddev, const char *buf, size_t len)
3333{
3334 int err = -EINVAL;
3335 enum array_state st = match_word(buf, array_states);
3336 switch(st) {
3337 case bad_word:
3338 break;
3339 case clear:
3340 /* stopping an active array */
NeilBrownf2ea68c2008-07-21 17:05:25 +10003341 if (atomic_read(&mddev->openers) > 0)
NeilBrowne6910632008-02-06 01:39:51 -08003342 return -EBUSY;
Neil Browndf5b20c2008-07-11 22:02:22 +10003343 err = do_md_stop(mddev, 0, 0);
NeilBrown9e653b62006-06-26 00:27:58 -07003344 break;
3345 case inactive:
3346 /* stopping an active array */
3347 if (mddev->pers) {
NeilBrownf2ea68c2008-07-21 17:05:25 +10003348 if (atomic_read(&mddev->openers) > 0)
NeilBrown9e653b62006-06-26 00:27:58 -07003349 return -EBUSY;
Neil Browndf5b20c2008-07-11 22:02:22 +10003350 err = do_md_stop(mddev, 2, 0);
NeilBrowne6910632008-02-06 01:39:51 -08003351 } else
3352 err = 0; /* already inactive */
NeilBrown9e653b62006-06-26 00:27:58 -07003353 break;
3354 case suspended:
3355 break; /* not supported yet */
3356 case readonly:
3357 if (mddev->pers)
NeilBrowna4bd82d2010-03-29 13:23:10 +11003358 err = md_set_readonly(mddev, 0);
NeilBrown9e653b62006-06-26 00:27:58 -07003359 else {
3360 mddev->ro = 1;
NeilBrown648b6292008-04-30 00:52:30 -07003361 set_disk_ro(mddev->gendisk, 1);
NeilBrown9e653b62006-06-26 00:27:58 -07003362 err = do_md_run(mddev);
3363 }
3364 break;
3365 case read_auto:
NeilBrown9e653b62006-06-26 00:27:58 -07003366 if (mddev->pers) {
NeilBrown80268ee2008-10-13 11:55:12 +11003367 if (mddev->ro == 0)
NeilBrowna4bd82d2010-03-29 13:23:10 +11003368 err = md_set_readonly(mddev, 0);
NeilBrown80268ee2008-10-13 11:55:12 +11003369 else if (mddev->ro == 1)
NeilBrown648b6292008-04-30 00:52:30 -07003370 err = restart_array(mddev);
3371 if (err == 0) {
3372 mddev->ro = 2;
3373 set_disk_ro(mddev->gendisk, 0);
3374 }
NeilBrown9e653b62006-06-26 00:27:58 -07003375 } else {
3376 mddev->ro = 2;
3377 err = do_md_run(mddev);
3378 }
3379 break;
3380 case clean:
3381 if (mddev->pers) {
3382 restart_array(mddev);
3383 spin_lock_irq(&mddev->write_lock);
3384 if (atomic_read(&mddev->writes_pending) == 0) {
NeilBrowne6910632008-02-06 01:39:51 -08003385 if (mddev->in_sync == 0) {
3386 mddev->in_sync = 1;
NeilBrown31a59e32008-04-30 00:52:30 -07003387 if (mddev->safemode == 1)
3388 mddev->safemode = 0;
NeilBrowne6910632008-02-06 01:39:51 -08003389 if (mddev->persistent)
3390 set_bit(MD_CHANGE_CLEAN,
3391 &mddev->flags);
3392 }
3393 err = 0;
3394 } else
3395 err = -EBUSY;
NeilBrown9e653b62006-06-26 00:27:58 -07003396 spin_unlock_irq(&mddev->write_lock);
NeilBrown5bf29592009-05-07 12:50:57 +10003397 } else
3398 err = -EINVAL;
NeilBrown9e653b62006-06-26 00:27:58 -07003399 break;
3400 case active:
3401 if (mddev->pers) {
3402 restart_array(mddev);
NeilBrowne6910632008-02-06 01:39:51 -08003403 if (mddev->external)
3404 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
NeilBrown9e653b62006-06-26 00:27:58 -07003405 wake_up(&mddev->sb_wait);
3406 err = 0;
3407 } else {
3408 mddev->ro = 0;
NeilBrown648b6292008-04-30 00:52:30 -07003409 set_disk_ro(mddev->gendisk, 0);
NeilBrown9e653b62006-06-26 00:27:58 -07003410 err = do_md_run(mddev);
3411 }
3412 break;
3413 case write_pending:
3414 case active_idle:
3415 /* these cannot be set */
3416 break;
3417 }
3418 if (err)
3419 return err;
Neil Brown0fd62b82008-06-28 08:31:36 +10003420 else {
NeilBrownb62b7592008-10-21 13:25:21 +11003421 sysfs_notify_dirent(mddev->sysfs_state);
NeilBrown9e653b62006-06-26 00:27:58 -07003422 return len;
Neil Brown0fd62b82008-06-28 08:31:36 +10003423 }
NeilBrown9e653b62006-06-26 00:27:58 -07003424}
NeilBrown80ca3a42006-07-10 04:44:18 -07003425static struct md_sysfs_entry md_array_state =
3426__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
NeilBrown9e653b62006-06-26 00:27:58 -07003427
NeilBrown6d7ff732006-01-06 00:21:16 -08003428static ssize_t
Robert Becker1e509152009-12-14 12:49:58 +11003429max_corrected_read_errors_show(mddev_t *mddev, char *page) {
3430 return sprintf(page, "%d\n",
3431 atomic_read(&mddev->max_corr_read_errors));
3432}
3433
3434static ssize_t
3435max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len)
3436{
3437 char *e;
3438 unsigned long n = simple_strtoul(buf, &e, 10);
3439
3440 if (*buf && (*e == 0 || *e == '\n')) {
3441 atomic_set(&mddev->max_corr_read_errors, n);
3442 return len;
3443 }
3444 return -EINVAL;
3445}
3446
3447static struct md_sysfs_entry max_corr_read_errors =
3448__ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
3449 max_corrected_read_errors_store);
3450
3451static ssize_t
NeilBrown6d7ff732006-01-06 00:21:16 -08003452null_show(mddev_t *mddev, char *page)
3453{
3454 return -EINVAL;
3455}
3456
3457static ssize_t
3458new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3459{
3460 /* buf must be %d:%d\n? giving major and minor numbers */
3461 /* The new device is added to the array.
3462 * If the array has a persistent superblock, we read the
3463 * superblock to initialise info and check validity.
3464 * Otherwise, only checking done is that in bind_rdev_to_array,
3465 * which mainly checks size.
3466 */
3467 char *e;
3468 int major = simple_strtoul(buf, &e, 10);
3469 int minor;
3470 dev_t dev;
3471 mdk_rdev_t *rdev;
3472 int err;
3473
3474 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3475 return -EINVAL;
3476 minor = simple_strtoul(e+1, &e, 10);
3477 if (*e && *e != '\n')
3478 return -EINVAL;
3479 dev = MKDEV(major, minor);
3480 if (major != MAJOR(dev) ||
3481 minor != MINOR(dev))
3482 return -EOVERFLOW;
3483
3484
3485 if (mddev->persistent) {
3486 rdev = md_import_device(dev, mddev->major_version,
3487 mddev->minor_version);
3488 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3489 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3490 mdk_rdev_t, same_set);
3491 err = super_types[mddev->major_version]
3492 .load_super(rdev, rdev0, mddev->minor_version);
3493 if (err < 0)
3494 goto out;
3495 }
NeilBrownc5d79ad2008-02-06 01:39:54 -08003496 } else if (mddev->external)
3497 rdev = md_import_device(dev, -2, -1);
3498 else
NeilBrown6d7ff732006-01-06 00:21:16 -08003499 rdev = md_import_device(dev, -1, -1);
3500
3501 if (IS_ERR(rdev))
3502 return PTR_ERR(rdev);
3503 err = bind_rdev_to_array(rdev, mddev);
3504 out:
3505 if (err)
3506 export_rdev(rdev);
3507 return err ? err : len;
3508}
3509
3510static struct md_sysfs_entry md_new_device =
NeilBrown80ca3a42006-07-10 04:44:18 -07003511__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
NeilBrown3b343802006-01-06 00:20:47 -08003512
3513static ssize_t
Paul Clements9b1d1da2006-10-03 01:15:49 -07003514bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3515{
3516 char *end;
3517 unsigned long chunk, end_chunk;
3518
3519 if (!mddev->bitmap)
3520 goto out;
3521 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3522 while (*buf) {
3523 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3524 if (buf == end) break;
3525 if (*end == '-') { /* range */
3526 buf = end + 1;
3527 end_chunk = simple_strtoul(buf, &end, 0);
3528 if (buf == end) break;
3529 }
3530 if (*end && !isspace(*end)) break;
3531 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
André Goddard Rosae7d28602009-12-14 18:01:06 -08003532 buf = skip_spaces(end);
Paul Clements9b1d1da2006-10-03 01:15:49 -07003533 }
3534 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3535out:
3536 return len;
3537}
3538
3539static struct md_sysfs_entry md_bitmap =
3540__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3541
3542static ssize_t
NeilBrowna35b0d692006-01-06 00:20:49 -08003543size_show(mddev_t *mddev, char *page)
3544{
Andre Noll58c0fed2009-03-31 14:33:13 +11003545 return sprintf(page, "%llu\n",
3546 (unsigned long long)mddev->dev_sectors / 2);
NeilBrowna35b0d692006-01-06 00:20:49 -08003547}
3548
Andre Nolld71f9f82008-07-11 22:02:22 +10003549static int update_size(mddev_t *mddev, sector_t num_sectors);
NeilBrowna35b0d692006-01-06 00:20:49 -08003550
3551static ssize_t
3552size_store(mddev_t *mddev, const char *buf, size_t len)
3553{
3554 /* If array is inactive, we can reduce the component size, but
3555 * not increase it (except from 0).
3556 * If array is active, we can try an on-line resize
3557 */
Dan Williamsb522adc2009-03-31 15:00:31 +11003558 sector_t sectors;
3559 int err = strict_blocks_to_sectors(buf, &sectors);
NeilBrowna35b0d692006-01-06 00:20:49 -08003560
Andre Noll58c0fed2009-03-31 14:33:13 +11003561 if (err < 0)
3562 return err;
NeilBrowna35b0d692006-01-06 00:20:49 -08003563 if (mddev->pers) {
Andre Noll58c0fed2009-03-31 14:33:13 +11003564 err = update_size(mddev, sectors);
NeilBrown850b2b42006-10-03 01:15:46 -07003565 md_update_sb(mddev, 1);
NeilBrowna35b0d692006-01-06 00:20:49 -08003566 } else {
Andre Noll58c0fed2009-03-31 14:33:13 +11003567 if (mddev->dev_sectors == 0 ||
3568 mddev->dev_sectors > sectors)
3569 mddev->dev_sectors = sectors;
NeilBrowna35b0d692006-01-06 00:20:49 -08003570 else
3571 err = -ENOSPC;
3572 }
3573 return err ? err : len;
3574}
3575
3576static struct md_sysfs_entry md_size =
NeilBrown80ca3a42006-07-10 04:44:18 -07003577__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
NeilBrowna35b0d692006-01-06 00:20:49 -08003578
NeilBrown8bb93aa2006-01-06 00:20:50 -08003579
3580/* Metdata version.
NeilBrowne6910632008-02-06 01:39:51 -08003581 * This is one of
3582 * 'none' for arrays with no metadata (good luck...)
3583 * 'external' for arrays with externally managed metadata,
NeilBrown8bb93aa2006-01-06 00:20:50 -08003584 * or N.M for internally known formats
3585 */
3586static ssize_t
3587metadata_show(mddev_t *mddev, char *page)
3588{
3589 if (mddev->persistent)
3590 return sprintf(page, "%d.%d\n",
3591 mddev->major_version, mddev->minor_version);
NeilBrowne6910632008-02-06 01:39:51 -08003592 else if (mddev->external)
3593 return sprintf(page, "external:%s\n", mddev->metadata_type);
NeilBrown8bb93aa2006-01-06 00:20:50 -08003594 else
3595 return sprintf(page, "none\n");
3596}
3597
3598static ssize_t
3599metadata_store(mddev_t *mddev, const char *buf, size_t len)
3600{
3601 int major, minor;
3602 char *e;
NeilBrownea43ddd2008-10-13 11:55:11 +11003603 /* Changing the details of 'external' metadata is
3604 * always permitted. Otherwise there must be
3605 * no devices attached to the array.
3606 */
3607 if (mddev->external && strncmp(buf, "external:", 9) == 0)
3608 ;
3609 else if (!list_empty(&mddev->disks))
NeilBrown8bb93aa2006-01-06 00:20:50 -08003610 return -EBUSY;
3611
3612 if (cmd_match(buf, "none")) {
3613 mddev->persistent = 0;
NeilBrowne6910632008-02-06 01:39:51 -08003614 mddev->external = 0;
3615 mddev->major_version = 0;
3616 mddev->minor_version = 90;
3617 return len;
3618 }
3619 if (strncmp(buf, "external:", 9) == 0) {
NeilBrown20a49ff2008-02-06 01:39:57 -08003620 size_t namelen = len-9;
NeilBrowne6910632008-02-06 01:39:51 -08003621 if (namelen >= sizeof(mddev->metadata_type))
3622 namelen = sizeof(mddev->metadata_type)-1;
3623 strncpy(mddev->metadata_type, buf+9, namelen);
3624 mddev->metadata_type[namelen] = 0;
3625 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3626 mddev->metadata_type[--namelen] = 0;
3627 mddev->persistent = 0;
3628 mddev->external = 1;
NeilBrown8bb93aa2006-01-06 00:20:50 -08003629 mddev->major_version = 0;
3630 mddev->minor_version = 90;
3631 return len;
3632 }
3633 major = simple_strtoul(buf, &e, 10);
3634 if (e==buf || *e != '.')
3635 return -EINVAL;
3636 buf = e+1;
3637 minor = simple_strtoul(buf, &e, 10);
NeilBrown3f9d7b02006-12-22 01:11:41 -08003638 if (e==buf || (*e && *e != '\n') )
NeilBrown8bb93aa2006-01-06 00:20:50 -08003639 return -EINVAL;
Ahmed S. Darwish50511da2007-05-09 02:35:34 -07003640 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
NeilBrown8bb93aa2006-01-06 00:20:50 -08003641 return -ENOENT;
3642 mddev->major_version = major;
3643 mddev->minor_version = minor;
3644 mddev->persistent = 1;
NeilBrowne6910632008-02-06 01:39:51 -08003645 mddev->external = 0;
NeilBrown8bb93aa2006-01-06 00:20:50 -08003646 return len;
3647}
3648
3649static struct md_sysfs_entry md_metadata =
NeilBrown80ca3a42006-07-10 04:44:18 -07003650__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
NeilBrown8bb93aa2006-01-06 00:20:50 -08003651
NeilBrowna35b0d692006-01-06 00:20:49 -08003652static ssize_t
NeilBrown7eec3142005-11-08 21:39:44 -08003653action_show(mddev_t *mddev, char *page)
NeilBrown24dd4692005-11-08 21:39:26 -08003654{
NeilBrown7eec3142005-11-08 21:39:44 -08003655 char *type = "idle";
NeilBrownb6a9ce62009-05-26 09:41:17 +10003656 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3657 type = "frozen";
3658 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
NeilBrown2b12ab62007-10-16 23:30:53 -07003659 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
NeilBrownccfcc3c2006-03-27 01:18:09 -08003660 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3661 type = "reshape";
3662 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
NeilBrown24dd4692005-11-08 21:39:26 -08003663 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3664 type = "resync";
3665 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3666 type = "check";
3667 else
3668 type = "repair";
Neil Brown72a23c22008-06-28 08:31:41 +10003669 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
NeilBrown24dd4692005-11-08 21:39:26 -08003670 type = "recover";
3671 }
3672 return sprintf(page, "%s\n", type);
3673}
3674
3675static ssize_t
NeilBrown7eec3142005-11-08 21:39:44 -08003676action_store(mddev_t *mddev, const char *page, size_t len)
NeilBrown24dd4692005-11-08 21:39:26 -08003677{
NeilBrown7eec3142005-11-08 21:39:44 -08003678 if (!mddev->pers || !mddev->pers->sync_request)
3679 return -EINVAL;
3680
NeilBrownb6a9ce62009-05-26 09:41:17 +10003681 if (cmd_match(page, "frozen"))
3682 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3683 else
3684 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3685
3686 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
NeilBrown7eec3142005-11-08 21:39:44 -08003687 if (mddev->sync_thread) {
3688 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3689 md_unregister_thread(mddev->sync_thread);
3690 mddev->sync_thread = NULL;
3691 mddev->recovery = 0;
3692 }
NeilBrown03c902e2006-01-06 00:20:46 -08003693 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3694 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
NeilBrown24dd4692005-11-08 21:39:26 -08003695 return -EBUSY;
Neil Brown72a23c22008-06-28 08:31:41 +10003696 else if (cmd_match(page, "resync"))
NeilBrown7eec3142005-11-08 21:39:44 -08003697 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
Neil Brown72a23c22008-06-28 08:31:41 +10003698 else if (cmd_match(page, "recover")) {
3699 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3700 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3701 } else if (cmd_match(page, "reshape")) {
NeilBrown16484bf2006-03-27 01:18:13 -08003702 int err;
3703 if (mddev->pers->start_reshape == NULL)
3704 return -EINVAL;
3705 err = mddev->pers->start_reshape(mddev);
3706 if (err)
3707 return err;
Neil Browna99ac972008-06-28 08:31:43 +10003708 sysfs_notify(&mddev->kobj, NULL, "degraded");
NeilBrown16484bf2006-03-27 01:18:13 -08003709 } else {
NeilBrownbce74da2006-01-06 00:20:41 -08003710 if (cmd_match(page, "check"))
NeilBrown7eec3142005-11-08 21:39:44 -08003711 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
NeilBrown2adc7d42006-05-20 14:59:57 -07003712 else if (!cmd_match(page, "repair"))
NeilBrown7eec3142005-11-08 21:39:44 -08003713 return -EINVAL;
3714 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3715 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
NeilBrown7eec3142005-11-08 21:39:44 -08003716 }
NeilBrown03c902e2006-01-06 00:20:46 -08003717 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown24dd4692005-11-08 21:39:26 -08003718 md_wakeup_thread(mddev->thread);
NeilBrown0c3573f2009-01-09 08:31:05 +11003719 sysfs_notify_dirent(mddev->sysfs_action);
NeilBrown24dd4692005-11-08 21:39:26 -08003720 return len;
3721}
3722
NeilBrown9d888832005-11-08 21:39:26 -08003723static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08003724mismatch_cnt_show(mddev_t *mddev, char *page)
NeilBrown9d888832005-11-08 21:39:26 -08003725{
3726 return sprintf(page, "%llu\n",
3727 (unsigned long long) mddev->resync_mismatches);
3728}
3729
NeilBrown80ca3a42006-07-10 04:44:18 -07003730static struct md_sysfs_entry md_scan_mode =
3731__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
NeilBrown24dd4692005-11-08 21:39:26 -08003732
NeilBrown96de1e62005-11-08 21:39:39 -08003733
NeilBrown80ca3a42006-07-10 04:44:18 -07003734static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
NeilBrown9d888832005-11-08 21:39:26 -08003735
NeilBrown88202a02006-01-06 00:21:36 -08003736static ssize_t
3737sync_min_show(mddev_t *mddev, char *page)
3738{
3739 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3740 mddev->sync_speed_min ? "local": "system");
3741}
3742
3743static ssize_t
3744sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3745{
3746 int min;
3747 char *e;
3748 if (strncmp(buf, "system", 6)==0) {
3749 mddev->sync_speed_min = 0;
3750 return len;
3751 }
3752 min = simple_strtoul(buf, &e, 10);
3753 if (buf == e || (*e && *e != '\n') || min <= 0)
3754 return -EINVAL;
3755 mddev->sync_speed_min = min;
3756 return len;
3757}
3758
3759static struct md_sysfs_entry md_sync_min =
3760__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3761
3762static ssize_t
3763sync_max_show(mddev_t *mddev, char *page)
3764{
3765 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3766 mddev->sync_speed_max ? "local": "system");
3767}
3768
3769static ssize_t
3770sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3771{
3772 int max;
3773 char *e;
3774 if (strncmp(buf, "system", 6)==0) {
3775 mddev->sync_speed_max = 0;
3776 return len;
3777 }
3778 max = simple_strtoul(buf, &e, 10);
3779 if (buf == e || (*e && *e != '\n') || max <= 0)
3780 return -EINVAL;
3781 mddev->sync_speed_max = max;
3782 return len;
3783}
3784
3785static struct md_sysfs_entry md_sync_max =
3786__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3787
Iustin Popd7f3d292007-10-16 23:30:54 -07003788static ssize_t
3789degraded_show(mddev_t *mddev, char *page)
3790{
3791 return sprintf(page, "%d\n", mddev->degraded);
3792}
3793static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
NeilBrown88202a02006-01-06 00:21:36 -08003794
3795static ssize_t
Bernd Schubert90b08712008-05-23 13:04:38 -07003796sync_force_parallel_show(mddev_t *mddev, char *page)
3797{
3798 return sprintf(page, "%d\n", mddev->parallel_resync);
3799}
3800
3801static ssize_t
3802sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3803{
3804 long n;
3805
3806 if (strict_strtol(buf, 10, &n))
3807 return -EINVAL;
3808
3809 if (n != 0 && n != 1)
3810 return -EINVAL;
3811
3812 mddev->parallel_resync = n;
3813
3814 if (mddev->sync_thread)
3815 wake_up(&resync_wait);
3816
3817 return len;
3818}
3819
3820/* force parallel resync, even with shared block devices */
3821static struct md_sysfs_entry md_sync_force_parallel =
3822__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3823 sync_force_parallel_show, sync_force_parallel_store);
3824
3825static ssize_t
NeilBrown88202a02006-01-06 00:21:36 -08003826sync_speed_show(mddev_t *mddev, char *page)
3827{
3828 unsigned long resync, dt, db;
NeilBrownd1a7c502009-03-31 15:24:32 +11003829 if (mddev->curr_resync == 0)
3830 return sprintf(page, "none\n");
Andre Noll9687a602008-03-25 22:24:09 +01003831 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3832 dt = (jiffies - mddev->resync_mark) / HZ;
NeilBrown88202a02006-01-06 00:21:36 -08003833 if (!dt) dt++;
Andre Noll9687a602008-03-25 22:24:09 +01003834 db = resync - mddev->resync_mark_cnt;
3835 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
NeilBrown88202a02006-01-06 00:21:36 -08003836}
3837
NeilBrown80ca3a42006-07-10 04:44:18 -07003838static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
NeilBrown88202a02006-01-06 00:21:36 -08003839
3840static ssize_t
3841sync_completed_show(mddev_t *mddev, char *page)
3842{
Andre Noll58c0fed2009-03-31 14:33:13 +11003843 unsigned long max_sectors, resync;
NeilBrown88202a02006-01-06 00:21:36 -08003844
NeilBrownacb180b2009-04-14 16:28:34 +10003845 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3846 return sprintf(page, "none\n");
3847
NeilBrown88202a02006-01-06 00:21:36 -08003848 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
Andre Noll58c0fed2009-03-31 14:33:13 +11003849 max_sectors = mddev->resync_max_sectors;
NeilBrown88202a02006-01-06 00:21:36 -08003850 else
Andre Noll58c0fed2009-03-31 14:33:13 +11003851 max_sectors = mddev->dev_sectors;
NeilBrown88202a02006-01-06 00:21:36 -08003852
NeilBrownacb180b2009-04-14 16:28:34 +10003853 resync = mddev->curr_resync_completed;
Andre Noll58c0fed2009-03-31 14:33:13 +11003854 return sprintf(page, "%lu / %lu\n", resync, max_sectors);
NeilBrown88202a02006-01-06 00:21:36 -08003855}
3856
NeilBrown80ca3a42006-07-10 04:44:18 -07003857static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
NeilBrown88202a02006-01-06 00:21:36 -08003858
NeilBrowne464eaf2006-03-27 01:18:14 -08003859static ssize_t
Neil Brown5e96ee62008-06-28 08:31:24 +10003860min_sync_show(mddev_t *mddev, char *page)
3861{
3862 return sprintf(page, "%llu\n",
3863 (unsigned long long)mddev->resync_min);
3864}
3865static ssize_t
3866min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3867{
3868 unsigned long long min;
3869 if (strict_strtoull(buf, 10, &min))
3870 return -EINVAL;
3871 if (min > mddev->resync_max)
3872 return -EINVAL;
3873 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3874 return -EBUSY;
3875
3876 /* Must be a multiple of chunk_size */
Andre Noll9d8f0362009-06-18 08:45:01 +10003877 if (mddev->chunk_sectors) {
raz ben yehuda2ac06c32009-06-16 17:01:42 +10003878 sector_t temp = min;
Andre Noll9d8f0362009-06-18 08:45:01 +10003879 if (sector_div(temp, mddev->chunk_sectors))
Neil Brown5e96ee62008-06-28 08:31:24 +10003880 return -EINVAL;
3881 }
3882 mddev->resync_min = min;
3883
3884 return len;
3885}
3886
3887static struct md_sysfs_entry md_min_sync =
3888__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3889
3890static ssize_t
NeilBrownc6207272008-02-06 01:39:52 -08003891max_sync_show(mddev_t *mddev, char *page)
3892{
3893 if (mddev->resync_max == MaxSector)
3894 return sprintf(page, "max\n");
3895 else
3896 return sprintf(page, "%llu\n",
3897 (unsigned long long)mddev->resync_max);
3898}
3899static ssize_t
3900max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3901{
3902 if (strncmp(buf, "max", 3) == 0)
3903 mddev->resync_max = MaxSector;
3904 else {
Neil Brown5e96ee62008-06-28 08:31:24 +10003905 unsigned long long max;
3906 if (strict_strtoull(buf, 10, &max))
3907 return -EINVAL;
3908 if (max < mddev->resync_min)
NeilBrownc6207272008-02-06 01:39:52 -08003909 return -EINVAL;
3910 if (max < mddev->resync_max &&
NeilBrown4d484a42009-08-13 10:41:50 +10003911 mddev->ro == 0 &&
NeilBrownc6207272008-02-06 01:39:52 -08003912 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3913 return -EBUSY;
3914
3915 /* Must be a multiple of chunk_size */
Andre Noll9d8f0362009-06-18 08:45:01 +10003916 if (mddev->chunk_sectors) {
raz ben yehuda2ac06c32009-06-16 17:01:42 +10003917 sector_t temp = max;
Andre Noll9d8f0362009-06-18 08:45:01 +10003918 if (sector_div(temp, mddev->chunk_sectors))
NeilBrownc6207272008-02-06 01:39:52 -08003919 return -EINVAL;
3920 }
3921 mddev->resync_max = max;
3922 }
3923 wake_up(&mddev->recovery_wait);
3924 return len;
3925}
3926
3927static struct md_sysfs_entry md_max_sync =
3928__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3929
3930static ssize_t
NeilBrowne464eaf2006-03-27 01:18:14 -08003931suspend_lo_show(mddev_t *mddev, char *page)
3932{
3933 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3934}
3935
3936static ssize_t
3937suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3938{
3939 char *e;
3940 unsigned long long new = simple_strtoull(buf, &e, 10);
3941
NeilBrownb8d966e2009-07-01 11:14:04 +10003942 if (mddev->pers == NULL ||
3943 mddev->pers->quiesce == NULL)
NeilBrowne464eaf2006-03-27 01:18:14 -08003944 return -EINVAL;
3945 if (buf == e || (*e && *e != '\n'))
3946 return -EINVAL;
3947 if (new >= mddev->suspend_hi ||
3948 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3949 mddev->suspend_lo = new;
3950 mddev->pers->quiesce(mddev, 2);
3951 return len;
3952 } else
3953 return -EINVAL;
3954}
3955static struct md_sysfs_entry md_suspend_lo =
3956__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3957
3958
3959static ssize_t
3960suspend_hi_show(mddev_t *mddev, char *page)
3961{
3962 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3963}
3964
3965static ssize_t
3966suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3967{
3968 char *e;
3969 unsigned long long new = simple_strtoull(buf, &e, 10);
3970
NeilBrownb8d966e2009-07-01 11:14:04 +10003971 if (mddev->pers == NULL ||
3972 mddev->pers->quiesce == NULL)
NeilBrowne464eaf2006-03-27 01:18:14 -08003973 return -EINVAL;
3974 if (buf == e || (*e && *e != '\n'))
3975 return -EINVAL;
3976 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3977 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3978 mddev->suspend_hi = new;
3979 mddev->pers->quiesce(mddev, 1);
3980 mddev->pers->quiesce(mddev, 0);
3981 return len;
3982 } else
3983 return -EINVAL;
3984}
3985static struct md_sysfs_entry md_suspend_hi =
3986__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3987
NeilBrown08a02ec2007-05-09 02:35:38 -07003988static ssize_t
3989reshape_position_show(mddev_t *mddev, char *page)
3990{
3991 if (mddev->reshape_position != MaxSector)
3992 return sprintf(page, "%llu\n",
3993 (unsigned long long)mddev->reshape_position);
3994 strcpy(page, "none\n");
3995 return 5;
3996}
3997
3998static ssize_t
3999reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
4000{
4001 char *e;
4002 unsigned long long new = simple_strtoull(buf, &e, 10);
4003 if (mddev->pers)
4004 return -EBUSY;
4005 if (buf == e || (*e && *e != '\n'))
4006 return -EINVAL;
4007 mddev->reshape_position = new;
4008 mddev->delta_disks = 0;
4009 mddev->new_level = mddev->level;
4010 mddev->new_layout = mddev->layout;
Andre Noll664e7c42009-06-18 08:45:27 +10004011 mddev->new_chunk_sectors = mddev->chunk_sectors;
NeilBrown08a02ec2007-05-09 02:35:38 -07004012 return len;
4013}
4014
4015static struct md_sysfs_entry md_reshape_position =
4016__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
4017 reshape_position_store);
4018
Dan Williamsb522adc2009-03-31 15:00:31 +11004019static ssize_t
4020array_size_show(mddev_t *mddev, char *page)
4021{
4022 if (mddev->external_size)
4023 return sprintf(page, "%llu\n",
4024 (unsigned long long)mddev->array_sectors/2);
4025 else
4026 return sprintf(page, "default\n");
4027}
4028
4029static ssize_t
4030array_size_store(mddev_t *mddev, const char *buf, size_t len)
4031{
4032 sector_t sectors;
4033
4034 if (strncmp(buf, "default", 7) == 0) {
4035 if (mddev->pers)
4036 sectors = mddev->pers->size(mddev, 0, 0);
4037 else
4038 sectors = mddev->array_sectors;
4039
4040 mddev->external_size = 0;
4041 } else {
4042 if (strict_blocks_to_sectors(buf, &sectors) < 0)
4043 return -EINVAL;
4044 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
NeilBrown2b69c832009-05-26 09:41:17 +10004045 return -E2BIG;
Dan Williamsb522adc2009-03-31 15:00:31 +11004046
4047 mddev->external_size = 1;
4048 }
4049
4050 mddev->array_sectors = sectors;
4051 set_capacity(mddev->gendisk, mddev->array_sectors);
NeilBrown449aad32009-08-03 10:59:58 +10004052 if (mddev->pers)
4053 revalidate_disk(mddev->gendisk);
Dan Williamsb522adc2009-03-31 15:00:31 +11004054
4055 return len;
4056}
4057
4058static struct md_sysfs_entry md_array_size =
4059__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
4060 array_size_store);
NeilBrowne464eaf2006-03-27 01:18:14 -08004061
NeilBrowneae17012005-11-08 21:39:23 -08004062static struct attribute *md_default_attrs[] = {
4063 &md_level.attr,
NeilBrownd4dbd022006-06-26 00:27:59 -07004064 &md_layout.attr,
NeilBrowneae17012005-11-08 21:39:23 -08004065 &md_raid_disks.attr,
NeilBrown3b343802006-01-06 00:20:47 -08004066 &md_chunk_size.attr,
NeilBrowna35b0d692006-01-06 00:20:49 -08004067 &md_size.attr,
NeilBrowna94213b2006-06-26 00:28:00 -07004068 &md_resync_start.attr,
NeilBrown8bb93aa2006-01-06 00:20:50 -08004069 &md_metadata.attr,
NeilBrown6d7ff732006-01-06 00:21:16 -08004070 &md_new_device.attr,
NeilBrown16f17b32006-06-26 00:27:37 -07004071 &md_safe_delay.attr,
NeilBrown9e653b62006-06-26 00:27:58 -07004072 &md_array_state.attr,
NeilBrown08a02ec2007-05-09 02:35:38 -07004073 &md_reshape_position.attr,
Dan Williamsb522adc2009-03-31 15:00:31 +11004074 &md_array_size.attr,
Robert Becker1e509152009-12-14 12:49:58 +11004075 &max_corr_read_errors.attr,
NeilBrown411036f2005-11-08 21:39:40 -08004076 NULL,
4077};
4078
4079static struct attribute *md_redundancy_attrs[] = {
NeilBrown24dd4692005-11-08 21:39:26 -08004080 &md_scan_mode.attr,
NeilBrown9d888832005-11-08 21:39:26 -08004081 &md_mismatches.attr,
NeilBrown88202a02006-01-06 00:21:36 -08004082 &md_sync_min.attr,
4083 &md_sync_max.attr,
4084 &md_sync_speed.attr,
Bernd Schubert90b08712008-05-23 13:04:38 -07004085 &md_sync_force_parallel.attr,
NeilBrown88202a02006-01-06 00:21:36 -08004086 &md_sync_completed.attr,
Neil Brown5e96ee62008-06-28 08:31:24 +10004087 &md_min_sync.attr,
NeilBrownc6207272008-02-06 01:39:52 -08004088 &md_max_sync.attr,
NeilBrowne464eaf2006-03-27 01:18:14 -08004089 &md_suspend_lo.attr,
4090 &md_suspend_hi.attr,
Paul Clements9b1d1da2006-10-03 01:15:49 -07004091 &md_bitmap.attr,
Iustin Popd7f3d292007-10-16 23:30:54 -07004092 &md_degraded.attr,
NeilBrowneae17012005-11-08 21:39:23 -08004093 NULL,
4094};
NeilBrown411036f2005-11-08 21:39:40 -08004095static struct attribute_group md_redundancy_group = {
4096 .name = NULL,
4097 .attrs = md_redundancy_attrs,
4098};
4099
NeilBrowneae17012005-11-08 21:39:23 -08004100
4101static ssize_t
4102md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
4103{
4104 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4105 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
NeilBrown96de1e62005-11-08 21:39:39 -08004106 ssize_t rv;
NeilBrowneae17012005-11-08 21:39:23 -08004107
4108 if (!entry->show)
4109 return -EIO;
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07004110 rv = mddev_lock(mddev);
4111 if (!rv) {
4112 rv = entry->show(mddev, page);
4113 mddev_unlock(mddev);
4114 }
NeilBrown96de1e62005-11-08 21:39:39 -08004115 return rv;
NeilBrowneae17012005-11-08 21:39:23 -08004116}
4117
4118static ssize_t
4119md_attr_store(struct kobject *kobj, struct attribute *attr,
4120 const char *page, size_t length)
4121{
4122 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
4123 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
NeilBrown96de1e62005-11-08 21:39:39 -08004124 ssize_t rv;
NeilBrowneae17012005-11-08 21:39:23 -08004125
4126 if (!entry->store)
4127 return -EIO;
NeilBrown67463ac2006-07-10 04:44:19 -07004128 if (!capable(CAP_SYS_ADMIN))
4129 return -EACCES;
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07004130 rv = mddev_lock(mddev);
NeilBrownd3374822009-01-09 08:31:10 +11004131 if (mddev->hold_active == UNTIL_IOCTL)
4132 mddev->hold_active = 0;
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07004133 if (!rv) {
4134 rv = entry->store(mddev, page, length);
4135 mddev_unlock(mddev);
4136 }
NeilBrown96de1e62005-11-08 21:39:39 -08004137 return rv;
NeilBrowneae17012005-11-08 21:39:23 -08004138}
4139
4140static void md_free(struct kobject *ko)
4141{
4142 mddev_t *mddev = container_of(ko, mddev_t, kobj);
NeilBrowna21d1502009-01-09 08:31:09 +11004143
4144 if (mddev->sysfs_state)
4145 sysfs_put(mddev->sysfs_state);
4146
4147 if (mddev->gendisk) {
4148 del_gendisk(mddev->gendisk);
4149 put_disk(mddev->gendisk);
4150 }
4151 if (mddev->queue)
4152 blk_cleanup_queue(mddev->queue);
4153
NeilBrowneae17012005-11-08 21:39:23 -08004154 kfree(mddev);
4155}
4156
4157static struct sysfs_ops md_sysfs_ops = {
4158 .show = md_attr_show,
4159 .store = md_attr_store,
4160};
4161static struct kobj_type md_ktype = {
4162 .release = md_free,
4163 .sysfs_ops = &md_sysfs_ops,
4164 .default_attrs = md_default_attrs,
4165};
4166
Linus Torvalds1da177e2005-04-16 15:20:36 -07004167int mdp_major = 0;
4168
Dan Williams5fd3a172009-03-04 00:57:25 -07004169static void mddev_delayed_delete(struct work_struct *ws)
4170{
4171 mddev_t *mddev = container_of(ws, mddev_t, del_work);
4172
NeilBrown43a70502009-12-14 12:49:55 +11004173 sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
Dan Williams5fd3a172009-03-04 00:57:25 -07004174 kobject_del(&mddev->kobj);
4175 kobject_put(&mddev->kobj);
4176}
4177
NeilBrownefeb53c2009-01-09 08:31:10 +11004178static int md_alloc(dev_t dev, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004179{
Arjan van de Ven48c9c272006-03-27 01:18:20 -08004180 static DEFINE_MUTEX(disks_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004181 mddev_t *mddev = mddev_find(dev);
4182 struct gendisk *disk;
NeilBrownefeb53c2009-01-09 08:31:10 +11004183 int partitioned;
4184 int shift;
4185 int unit;
Greg Kroah-Hartman3830c622007-12-17 15:54:39 -04004186 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004187
4188 if (!mddev)
NeilBrownefeb53c2009-01-09 08:31:10 +11004189 return -ENODEV;
4190
4191 partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
4192 shift = partitioned ? MdpMinorShift : 0;
4193 unit = MINOR(mddev->unit) >> shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004194
NeilBrownd3374822009-01-09 08:31:10 +11004195 /* wait for any previous instance if this device
4196 * to be completed removed (mddev_delayed_delete).
4197 */
4198 flush_scheduled_work();
4199
Arjan van de Ven48c9c272006-03-27 01:18:20 -08004200 mutex_lock(&disks_mutex);
NeilBrown0909dc42009-07-01 12:27:21 +10004201 error = -EEXIST;
4202 if (mddev->gendisk)
4203 goto abort;
NeilBrownefeb53c2009-01-09 08:31:10 +11004204
4205 if (name) {
4206 /* Need to ensure that 'name' is not a duplicate.
4207 */
4208 mddev_t *mddev2;
4209 spin_lock(&all_mddevs_lock);
4210
4211 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
4212 if (mddev2->gendisk &&
4213 strcmp(mddev2->gendisk->disk_name, name) == 0) {
4214 spin_unlock(&all_mddevs_lock);
NeilBrown0909dc42009-07-01 12:27:21 +10004215 goto abort;
NeilBrownefeb53c2009-01-09 08:31:10 +11004216 }
4217 spin_unlock(&all_mddevs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004218 }
NeilBrown8b765392009-01-09 08:31:08 +11004219
NeilBrown0909dc42009-07-01 12:27:21 +10004220 error = -ENOMEM;
NeilBrown8b765392009-01-09 08:31:08 +11004221 mddev->queue = blk_alloc_queue(GFP_KERNEL);
NeilBrown0909dc42009-07-01 12:27:21 +10004222 if (!mddev->queue)
4223 goto abort;
NeilBrown409c57f2009-03-31 14:39:39 +11004224 mddev->queue->queuedata = mddev;
4225
NeilBrown8b765392009-01-09 08:31:08 +11004226 /* Can be unlocked because the queue is new: no concurrency */
4227 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
4228
NeilBrown409c57f2009-03-31 14:39:39 +11004229 blk_queue_make_request(mddev->queue, md_make_request);
NeilBrown8b765392009-01-09 08:31:08 +11004230
Linus Torvalds1da177e2005-04-16 15:20:36 -07004231 disk = alloc_disk(1 << shift);
4232 if (!disk) {
NeilBrown8b765392009-01-09 08:31:08 +11004233 blk_cleanup_queue(mddev->queue);
4234 mddev->queue = NULL;
NeilBrown0909dc42009-07-01 12:27:21 +10004235 goto abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004236 }
NeilBrownefeb53c2009-01-09 08:31:10 +11004237 disk->major = MAJOR(mddev->unit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004238 disk->first_minor = unit << shift;
NeilBrownefeb53c2009-01-09 08:31:10 +11004239 if (name)
4240 strcpy(disk->disk_name, name);
4241 else if (partitioned)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004242 sprintf(disk->disk_name, "md_d%d", unit);
Greg Kroah-Hartmance7b0f42005-06-20 21:15:16 -07004243 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07004244 sprintf(disk->disk_name, "md%d", unit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004245 disk->fops = &md_fops;
4246 disk->private_data = mddev;
4247 disk->queue = mddev->queue;
NeilBrown92850bb2008-10-21 13:25:32 +11004248 /* Allow extended partitions. This makes the
NeilBrownd3374822009-01-09 08:31:10 +11004249 * 'mdp' device redundant, but we can't really
NeilBrown92850bb2008-10-21 13:25:32 +11004250 * remove it now.
4251 */
4252 disk->flags |= GENHD_FL_EXT_DEVT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004253 add_disk(disk);
4254 mddev->gendisk = disk;
Tejun Heoed9e1982008-08-25 19:56:05 +09004255 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
4256 &disk_to_dev(disk)->kobj, "%s", "md");
NeilBrown0909dc42009-07-01 12:27:21 +10004257 if (error) {
4258 /* This isn't possible, but as kobject_init_and_add is marked
4259 * __must_check, we must do something with the result
4260 */
NeilBrown5e55e2f2007-03-26 21:32:14 -08004261 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
4262 disk->disk_name);
NeilBrown0909dc42009-07-01 12:27:21 +10004263 error = 0;
4264 }
NeilBrown43a70502009-12-14 12:49:55 +11004265 if (sysfs_create_group(&mddev->kobj, &md_bitmap_group))
4266 printk(KERN_DEBUG "pointless warning\n");
NeilBrown0909dc42009-07-01 12:27:21 +10004267 abort:
4268 mutex_unlock(&disks_mutex);
4269 if (!error) {
Greg Kroah-Hartman3830c622007-12-17 15:54:39 -04004270 kobject_uevent(&mddev->kobj, KOBJ_ADD);
NeilBrownb62b7592008-10-21 13:25:21 +11004271 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
4272 }
NeilBrownd3374822009-01-09 08:31:10 +11004273 mddev_put(mddev);
NeilBrown0909dc42009-07-01 12:27:21 +10004274 return error;
NeilBrownefeb53c2009-01-09 08:31:10 +11004275}
4276
4277static struct kobject *md_probe(dev_t dev, int *part, void *data)
4278{
4279 md_alloc(dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004280 return NULL;
4281}
4282
NeilBrownefeb53c2009-01-09 08:31:10 +11004283static int add_named_array(const char *val, struct kernel_param *kp)
4284{
4285 /* val must be "md_*" where * is not all digits.
4286 * We allocate an array with a large free minor number, and
4287 * set the name to val. val must not already be an active name.
4288 */
4289 int len = strlen(val);
4290 char buf[DISK_NAME_LEN];
4291
4292 while (len && val[len-1] == '\n')
4293 len--;
4294 if (len >= DISK_NAME_LEN)
4295 return -E2BIG;
4296 strlcpy(buf, val, len+1);
4297 if (strncmp(buf, "md_", 3) != 0)
4298 return -EINVAL;
4299 return md_alloc(0, buf);
4300}
4301
Linus Torvalds1da177e2005-04-16 15:20:36 -07004302static void md_safemode_timeout(unsigned long data)
4303{
4304 mddev_t *mddev = (mddev_t *) data;
4305
Neil Brown0fd62b82008-06-28 08:31:36 +10004306 if (!atomic_read(&mddev->writes_pending)) {
4307 mddev->safemode = 1;
4308 if (mddev->external)
NeilBrownb62b7592008-10-21 13:25:21 +11004309 sysfs_notify_dirent(mddev->sysfs_state);
Neil Brown0fd62b82008-06-28 08:31:36 +10004310 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004311 md_wakeup_thread(mddev->thread);
4312}
4313
NeilBrown6ff8d8ec2006-01-06 00:20:15 -08004314static int start_dirty_degraded;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004315
NeilBrownfe60b012010-03-29 11:10:42 +11004316static int md_run(mddev_t *mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004317{
NeilBrown2604b702006-01-06 00:20:36 -08004318 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004319 mdk_rdev_t *rdev;
NeilBrown2604b702006-01-06 00:20:36 -08004320 struct mdk_personality *pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004321
NeilBrowna757e642005-04-16 15:26:42 -07004322 if (list_empty(&mddev->disks))
4323 /* cannot run an array with no devices.. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004324 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004325
4326 if (mddev->pers)
4327 return -EBUSY;
4328
NeilBrownb6eb1272010-04-15 10:13:47 +10004329 /* These two calls synchronise us with the
4330 * sysfs_remove_group calls in mddev_unlock,
4331 * so they must have completed.
4332 */
4333 mutex_lock(&mddev->open_mutex);
4334 mutex_unlock(&mddev->open_mutex);
4335
Linus Torvalds1da177e2005-04-16 15:20:36 -07004336 /*
4337 * Analyze all RAID superblock(s)
4338 */
NeilBrown1ec4a932008-02-06 01:39:53 -08004339 if (!mddev->raid_disks) {
4340 if (!mddev->persistent)
4341 return -EINVAL;
NeilBrowna757e642005-04-16 15:26:42 -07004342 analyze_sbs(mddev);
NeilBrown1ec4a932008-02-06 01:39:53 -08004343 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004344
NeilBrownd9d166c2006-01-06 00:20:51 -08004345 if (mddev->level != LEVEL_NONE)
4346 request_module("md-level-%d", mddev->level);
4347 else if (mddev->clevel[0])
4348 request_module("md-%s", mddev->clevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004349
4350 /*
4351 * Drop all container device buffers, from now on
4352 * the only valid external interface is through the md
4353 * device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004354 */
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004355 list_for_each_entry(rdev, &mddev->disks, same_set) {
NeilBrownb2d444d2005-11-08 21:39:31 -08004356 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004357 continue;
4358 sync_blockdev(rdev->bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -07004359 invalidate_bdev(rdev->bdev);
NeilBrownf0d76d72007-07-17 04:06:12 -07004360
4361 /* perform some consistency tests on the device.
4362 * We don't want the data to overlap the metadata,
Andre Noll58c0fed2009-03-31 14:33:13 +11004363 * Internal Bitmap issues have been handled elsewhere.
NeilBrownf0d76d72007-07-17 04:06:12 -07004364 */
Andre Noll0f420352008-07-11 22:02:23 +10004365 if (rdev->data_offset < rdev->sb_start) {
Andre Noll58c0fed2009-03-31 14:33:13 +11004366 if (mddev->dev_sectors &&
4367 rdev->data_offset + mddev->dev_sectors
Andre Noll0f420352008-07-11 22:02:23 +10004368 > rdev->sb_start) {
NeilBrownf0d76d72007-07-17 04:06:12 -07004369 printk("md: %s: data overlaps metadata\n",
4370 mdname(mddev));
4371 return -EINVAL;
4372 }
4373 } else {
Andre Noll0f420352008-07-11 22:02:23 +10004374 if (rdev->sb_start + rdev->sb_size/512
NeilBrownf0d76d72007-07-17 04:06:12 -07004375 > rdev->data_offset) {
4376 printk("md: %s: metadata overlaps data\n",
4377 mdname(mddev));
4378 return -EINVAL;
4379 }
4380 }
NeilBrown3c0ee632008-10-21 13:25:28 +11004381 sysfs_notify_dirent(rdev->sysfs_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004382 }
4383
Linus Torvalds1da177e2005-04-16 15:20:36 -07004384 spin_lock(&pers_lock);
NeilBrownd9d166c2006-01-06 00:20:51 -08004385 pers = find_pers(mddev->level, mddev->clevel);
NeilBrown2604b702006-01-06 00:20:36 -08004386 if (!pers || !try_module_get(pers->owner)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004387 spin_unlock(&pers_lock);
NeilBrownd9d166c2006-01-06 00:20:51 -08004388 if (mddev->level != LEVEL_NONE)
4389 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4390 mddev->level);
4391 else
4392 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4393 mddev->clevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004394 return -EINVAL;
4395 }
NeilBrown2604b702006-01-06 00:20:36 -08004396 mddev->pers = pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004397 spin_unlock(&pers_lock);
NeilBrown34817e82009-03-31 14:39:38 +11004398 if (mddev->level != pers->level) {
4399 mddev->level = pers->level;
4400 mddev->new_level = pers->level;
4401 }
NeilBrownd9d166c2006-01-06 00:20:51 -08004402 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004403
NeilBrownf6705572006-03-27 01:18:11 -08004404 if (mddev->reshape_position != MaxSector &&
NeilBrown63c70c42006-03-27 01:18:13 -08004405 pers->start_reshape == NULL) {
NeilBrownf6705572006-03-27 01:18:11 -08004406 /* This personality cannot handle reshaping... */
4407 mddev->pers = NULL;
4408 module_put(pers->owner);
4409 return -EINVAL;
4410 }
4411
NeilBrown7dd5e7c32007-02-28 20:11:35 -08004412 if (pers->sync_request) {
4413 /* Warn if this is a potentially silly
4414 * configuration.
4415 */
4416 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4417 mdk_rdev_t *rdev2;
NeilBrown7dd5e7c32007-02-28 20:11:35 -08004418 int warned = 0;
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004419
4420 list_for_each_entry(rdev, &mddev->disks, same_set)
4421 list_for_each_entry(rdev2, &mddev->disks, same_set) {
NeilBrown7dd5e7c32007-02-28 20:11:35 -08004422 if (rdev < rdev2 &&
4423 rdev->bdev->bd_contains ==
4424 rdev2->bdev->bd_contains) {
4425 printk(KERN_WARNING
4426 "%s: WARNING: %s appears to be"
4427 " on the same physical disk as"
4428 " %s.\n",
4429 mdname(mddev),
4430 bdevname(rdev->bdev,b),
4431 bdevname(rdev2->bdev,b2));
4432 warned = 1;
4433 }
4434 }
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004435
NeilBrown7dd5e7c32007-02-28 20:11:35 -08004436 if (warned)
4437 printk(KERN_WARNING
4438 "True protection against single-disk"
4439 " failure might be compromised.\n");
4440 }
4441
NeilBrown657390d2005-08-26 18:34:16 -07004442 mddev->recovery = 0;
Andre Noll58c0fed2009-03-31 14:33:13 +11004443 /* may be over-ridden by personality */
4444 mddev->resync_max_sectors = mddev->dev_sectors;
4445
NeilBrowna9701a32005-11-08 21:39:34 -08004446 mddev->barriers_work = 1;
NeilBrown6ff8d8ec2006-01-06 00:20:15 -08004447 mddev->ok_start_degraded = start_dirty_degraded;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004448
NeilBrown0f9552b2009-12-30 12:08:50 +11004449 if (start_readonly && mddev->ro == 0)
NeilBrownf91de922005-11-08 21:39:36 -08004450 mddev->ro = 2; /* read-only, but switch on first write */
4451
NeilBrownb15c2e52006-01-06 00:20:16 -08004452 err = mddev->pers->run(mddev);
Andre Noll13e53df2008-03-26 00:07:03 +01004453 if (err)
4454 printk(KERN_ERR "md: pers->run() failed ...\n");
Dan Williamsb522adc2009-03-31 15:00:31 +11004455 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4456 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4457 " but 'external_size' not in effect?\n", __func__);
4458 printk(KERN_ERR
4459 "md: invalid array_size %llu > default size %llu\n",
4460 (unsigned long long)mddev->array_sectors / 2,
4461 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4462 err = -EINVAL;
4463 mddev->pers->stop(mddev);
4464 }
4465 if (err == 0 && mddev->pers->sync_request) {
NeilBrownb15c2e52006-01-06 00:20:16 -08004466 err = bitmap_create(mddev);
4467 if (err) {
4468 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4469 mdname(mddev), err);
4470 mddev->pers->stop(mddev);
4471 }
4472 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004473 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004474 module_put(mddev->pers->owner);
4475 mddev->pers = NULL;
NeilBrown32a76272005-06-21 17:17:14 -07004476 bitmap_destroy(mddev);
4477 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004478 }
NeilBrown5e55e2f2007-03-26 21:32:14 -08004479 if (mddev->pers->sync_request) {
4480 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4481 printk(KERN_WARNING
4482 "md: cannot register extra attributes for %s\n",
4483 mdname(mddev));
NeilBrown0c3573f2009-01-09 08:31:05 +11004484 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
NeilBrown5e55e2f2007-03-26 21:32:14 -08004485 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
NeilBrownfd9d49c2005-11-08 21:39:42 -08004486 mddev->ro = 0;
4487
Linus Torvalds1da177e2005-04-16 15:20:36 -07004488 atomic_set(&mddev->writes_pending,0);
Robert Becker1e509152009-12-14 12:49:58 +11004489 atomic_set(&mddev->max_corr_read_errors,
4490 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004491 mddev->safemode = 0;
4492 mddev->safemode_timer.function = md_safemode_timeout;
4493 mddev->safemode_timer.data = (unsigned long) mddev;
NeilBrown16f17b32006-06-26 00:27:37 -07004494 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004495 mddev->in_sync = 1;
NeilBrown86e6ffd2005-11-08 21:39:24 -08004496
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004497 list_for_each_entry(rdev, &mddev->disks, same_set)
NeilBrown86e6ffd2005-11-08 21:39:24 -08004498 if (rdev->raid_disk >= 0) {
4499 char nm[20];
4500 sprintf(nm, "rd%d", rdev->raid_disk);
NeilBrown5e55e2f2007-03-26 21:32:14 -08004501 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4502 printk("md: cannot register %s for %s\n",
4503 nm, mdname(mddev));
NeilBrown86e6ffd2005-11-08 21:39:24 -08004504 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004505
4506 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4507
NeilBrown850b2b42006-10-03 01:15:46 -07004508 if (mddev->flags)
4509 md_update_sb(mddev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004510
NeilBrown0b8c9de2006-07-10 04:44:15 -07004511 md_wakeup_thread(mddev->thread);
4512 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
NeilBrown5fd6c1d2006-06-26 00:27:40 -07004513
NeilBrownd7603b72006-01-06 00:20:30 -08004514 md_new_event(mddev);
NeilBrownb62b7592008-10-21 13:25:21 +11004515 sysfs_notify_dirent(mddev->sysfs_state);
NeilBrown0c3573f2009-01-09 08:31:05 +11004516 if (mddev->sysfs_action)
4517 sysfs_notify_dirent(mddev->sysfs_action);
Neil Browna99ac972008-06-28 08:31:43 +10004518 sysfs_notify(&mddev->kobj, NULL, "degraded");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004519 return 0;
4520}
4521
NeilBrownfe60b012010-03-29 11:10:42 +11004522static int do_md_run(mddev_t *mddev)
4523{
4524 int err;
4525
4526 err = md_run(mddev);
4527 if (err)
4528 goto out;
4529
4530 set_capacity(mddev->gendisk, mddev->array_sectors);
4531 revalidate_disk(mddev->gendisk);
4532 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4533out:
4534 return err;
4535}
4536
Linus Torvalds1da177e2005-04-16 15:20:36 -07004537static int restart_array(mddev_t *mddev)
4538{
4539 struct gendisk *disk = mddev->gendisk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004540
Andre Noll80fab1d2008-07-11 22:02:21 +10004541 /* Complain if it has no devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004542 if (list_empty(&mddev->disks))
Andre Noll80fab1d2008-07-11 22:02:21 +10004543 return -ENXIO;
4544 if (!mddev->pers)
4545 return -EINVAL;
4546 if (!mddev->ro)
4547 return -EBUSY;
4548 mddev->safemode = 0;
4549 mddev->ro = 0;
4550 set_disk_ro(disk, 0);
4551 printk(KERN_INFO "md: %s switched to read-write mode.\n",
4552 mdname(mddev));
4553 /* Kick recovery or resync if necessary */
4554 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4555 md_wakeup_thread(mddev->thread);
4556 md_wakeup_thread(mddev->sync_thread);
NeilBrownb62b7592008-10-21 13:25:21 +11004557 sysfs_notify_dirent(mddev->sysfs_state);
Andre Noll80fab1d2008-07-11 22:02:21 +10004558 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004559}
4560
NeilBrownacc55e22006-06-26 00:27:47 -07004561/* similar to deny_write_access, but accounts for our holding a reference
4562 * to the file ourselves */
4563static int deny_bitmap_write_access(struct file * file)
4564{
4565 struct inode *inode = file->f_mapping->host;
4566
4567 spin_lock(&inode->i_lock);
4568 if (atomic_read(&inode->i_writecount) > 1) {
4569 spin_unlock(&inode->i_lock);
4570 return -ETXTBSY;
4571 }
4572 atomic_set(&inode->i_writecount, -1);
4573 spin_unlock(&inode->i_lock);
4574
4575 return 0;
4576}
4577
NeilBrown43a70502009-12-14 12:49:55 +11004578void restore_bitmap_write_access(struct file *file)
NeilBrownacc55e22006-06-26 00:27:47 -07004579{
4580 struct inode *inode = file->f_mapping->host;
4581
4582 spin_lock(&inode->i_lock);
4583 atomic_set(&inode->i_writecount, 1);
4584 spin_unlock(&inode->i_lock);
4585}
4586
NeilBrown6177b472010-03-29 11:37:13 +11004587static void md_clean(mddev_t *mddev)
4588{
4589 mddev->array_sectors = 0;
4590 mddev->external_size = 0;
4591 mddev->dev_sectors = 0;
4592 mddev->raid_disks = 0;
4593 mddev->recovery_cp = 0;
4594 mddev->resync_min = 0;
4595 mddev->resync_max = MaxSector;
4596 mddev->reshape_position = MaxSector;
4597 mddev->external = 0;
4598 mddev->persistent = 0;
4599 mddev->level = LEVEL_NONE;
4600 mddev->clevel[0] = 0;
4601 mddev->flags = 0;
4602 mddev->ro = 0;
4603 mddev->metadata_type[0] = 0;
4604 mddev->chunk_sectors = 0;
4605 mddev->ctime = mddev->utime = 0;
4606 mddev->layout = 0;
4607 mddev->max_disks = 0;
4608 mddev->events = 0;
4609 mddev->delta_disks = 0;
4610 mddev->new_level = LEVEL_NONE;
4611 mddev->new_layout = 0;
4612 mddev->new_chunk_sectors = 0;
4613 mddev->curr_resync = 0;
4614 mddev->resync_mismatches = 0;
4615 mddev->suspend_lo = mddev->suspend_hi = 0;
4616 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4617 mddev->recovery = 0;
4618 mddev->in_sync = 0;
4619 mddev->degraded = 0;
4620 mddev->barriers_work = 0;
4621 mddev->safemode = 0;
4622 mddev->bitmap_info.offset = 0;
4623 mddev->bitmap_info.default_offset = 0;
4624 mddev->bitmap_info.chunksize = 0;
4625 mddev->bitmap_info.daemon_sleep = 0;
4626 mddev->bitmap_info.max_write_behind = 0;
4627}
4628
NeilBrowna047e122010-03-29 12:07:53 +11004629static void md_stop_writes(mddev_t *mddev)
4630{
4631 if (mddev->sync_thread) {
4632 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4633 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4634 md_unregister_thread(mddev->sync_thread);
4635 mddev->sync_thread = NULL;
4636 }
4637
4638 del_timer_sync(&mddev->safemode_timer);
4639
4640 bitmap_flush(mddev);
4641 md_super_wait(mddev);
4642
4643 if (!mddev->in_sync || mddev->flags) {
4644 /* mark array as shutdown cleanly */
4645 mddev->in_sync = 1;
4646 md_update_sb(mddev, 1);
4647 }
4648}
4649
NeilBrown6177b472010-03-29 11:37:13 +11004650static void md_stop(mddev_t *mddev)
4651{
NeilBrowncca9cf92010-04-01 12:08:16 +11004652 md_stop_writes(mddev);
4653
NeilBrown6177b472010-03-29 11:37:13 +11004654 mddev->pers->stop(mddev);
4655 if (mddev->pers->sync_request && mddev->to_remove == NULL)
4656 mddev->to_remove = &md_redundancy_group;
4657 module_put(mddev->pers->owner);
4658 mddev->pers = NULL;
NeilBrowncca9cf92010-04-01 12:08:16 +11004659 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
NeilBrown6177b472010-03-29 11:37:13 +11004660}
4661
NeilBrowna4bd82d2010-03-29 13:23:10 +11004662static int md_set_readonly(mddev_t *mddev, int is_open)
4663{
4664 int err = 0;
4665 mutex_lock(&mddev->open_mutex);
4666 if (atomic_read(&mddev->openers) > is_open) {
4667 printk("md: %s still in use.\n",mdname(mddev));
4668 err = -EBUSY;
4669 goto out;
4670 }
4671 if (mddev->pers) {
4672 md_stop_writes(mddev);
4673
4674 err = -ENXIO;
4675 if (mddev->ro==1)
4676 goto out;
4677 mddev->ro = 1;
4678 set_disk_ro(mddev->gendisk, 1);
4679 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4680 sysfs_notify_dirent(mddev->sysfs_state);
4681 err = 0;
4682 }
4683out:
4684 mutex_unlock(&mddev->open_mutex);
4685 return err;
4686}
4687
NeilBrown9e653b62006-06-26 00:27:58 -07004688/* mode:
4689 * 0 - completely stop and dis-assemble array
NeilBrown9e653b62006-06-26 00:27:58 -07004690 * 2 - stop but do not disassemble array
4691 */
Neil Browndf5b20c2008-07-11 22:02:22 +10004692static int do_md_stop(mddev_t * mddev, int mode, int is_open)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004693{
4694 int err = 0;
4695 struct gendisk *disk = mddev->gendisk;
NeilBrownc4647292009-05-07 12:51:06 +10004696 mdk_rdev_t *rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004697
NeilBrownc8c00a62009-08-10 12:50:52 +10004698 mutex_lock(&mddev->open_mutex);
NeilBrownf2ea68c2008-07-21 17:05:25 +10004699 if (atomic_read(&mddev->openers) > is_open) {
Neil Browndf5b20c2008-07-11 22:02:22 +10004700 printk("md: %s still in use.\n",mdname(mddev));
NeilBrownc8c00a62009-08-10 12:50:52 +10004701 err = -EBUSY;
4702 } else if (mddev->pers) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004703
NeilBrowna4bd82d2010-03-29 13:23:10 +11004704 if (mddev->ro)
4705 set_disk_ro(disk, 0);
NeilBrown409c57f2009-03-31 14:39:39 +11004706
NeilBrowna4bd82d2010-03-29 13:23:10 +11004707 md_stop(mddev);
4708 mddev->queue->merge_bvec_fn = NULL;
4709 mddev->queue->unplug_fn = NULL;
4710 mddev->queue->backing_dev_info.congested_fn = NULL;
NeilBrown6177b472010-03-29 11:37:13 +11004711
NeilBrowna4bd82d2010-03-29 13:23:10 +11004712 /* tell userspace to handle 'inactive' */
4713 sysfs_notify_dirent(mddev->sysfs_state);
NeilBrown0d4ca602006-12-10 02:20:44 -08004714
NeilBrowna4bd82d2010-03-29 13:23:10 +11004715 list_for_each_entry(rdev, &mddev->disks, same_set)
4716 if (rdev->raid_disk >= 0) {
4717 char nm[20];
4718 sprintf(nm, "rd%d", rdev->raid_disk);
4719 sysfs_remove_link(&mddev->kobj, nm);
4720 }
NeilBrownc4647292009-05-07 12:51:06 +10004721
NeilBrowna4bd82d2010-03-29 13:23:10 +11004722 set_capacity(disk, 0);
4723 revalidate_disk(disk);
NeilBrown0d4ca602006-12-10 02:20:44 -08004724
NeilBrowna4bd82d2010-03-29 13:23:10 +11004725 if (mddev->ro)
4726 mddev->ro = 0;
4727
NeilBrown80ffb3c2009-08-18 10:35:26 +10004728 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004729 }
NeilBrownc8c00a62009-08-10 12:50:52 +10004730 mutex_unlock(&mddev->open_mutex);
4731 if (err)
4732 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004733 /*
4734 * Free resources if final stop
4735 */
NeilBrown9e653b62006-06-26 00:27:58 -07004736 if (mode == 0) {
NeilBrown0d4ca602006-12-10 02:20:44 -08004737
Linus Torvalds1da177e2005-04-16 15:20:36 -07004738 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4739
NeilBrown978f9462006-02-02 14:28:05 -08004740 bitmap_destroy(mddev);
NeilBrownc3d97142009-12-14 12:49:52 +11004741 if (mddev->bitmap_info.file) {
4742 restore_bitmap_write_access(mddev->bitmap_info.file);
4743 fput(mddev->bitmap_info.file);
4744 mddev->bitmap_info.file = NULL;
NeilBrown978f9462006-02-02 14:28:05 -08004745 }
NeilBrownc3d97142009-12-14 12:49:52 +11004746 mddev->bitmap_info.offset = 0;
NeilBrown978f9462006-02-02 14:28:05 -08004747
Linus Torvalds1da177e2005-04-16 15:20:36 -07004748 export_array(mddev);
4749
NeilBrown6177b472010-03-29 11:37:13 +11004750 md_clean(mddev);
NeilBrown934d9c22008-10-28 17:01:23 +11004751 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
NeilBrownefeb53c2009-01-09 08:31:10 +11004752 if (mddev->hold_active == UNTIL_STOP)
4753 mddev->hold_active = 0;
NeilBrown9e653b62006-06-26 00:27:58 -07004754
NeilBrowna4bd82d2010-03-29 13:23:10 +11004755 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004756 err = 0;
Martin K. Petersen3f9d99c2009-03-31 14:27:02 +11004757 blk_integrity_unregister(disk);
NeilBrownd7603b72006-01-06 00:20:30 -08004758 md_new_event(mddev);
NeilBrownb62b7592008-10-21 13:25:21 +11004759 sysfs_notify_dirent(mddev->sysfs_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004760 return err;
4761}
4762
Jeff Garzikfdee8ae2006-12-10 02:20:50 -08004763#ifndef MODULE
Linus Torvalds1da177e2005-04-16 15:20:36 -07004764static void autorun_array(mddev_t *mddev)
4765{
4766 mdk_rdev_t *rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004767 int err;
4768
NeilBrowna757e642005-04-16 15:26:42 -07004769 if (list_empty(&mddev->disks))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004770 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004771
4772 printk(KERN_INFO "md: running: ");
4773
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004774 list_for_each_entry(rdev, &mddev->disks, same_set) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004775 char b[BDEVNAME_SIZE];
4776 printk("<%s>", bdevname(rdev->bdev,b));
4777 }
4778 printk("\n");
4779
NeilBrownd710e132008-10-13 11:55:12 +11004780 err = do_md_run(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004781 if (err) {
4782 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
NeilBrownd710e132008-10-13 11:55:12 +11004783 do_md_stop(mddev, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004784 }
4785}
4786
4787/*
4788 * lets try to run arrays based on all disks that have arrived
4789 * until now. (those are in pending_raid_disks)
4790 *
4791 * the method: pick the first pending disk, collect all disks with
4792 * the same UUID, remove all from the pending list and put them into
4793 * the 'same_array' list. Then order this list based on superblock
4794 * update time (freshest comes first), kick out 'old' disks and
4795 * compare superblocks. If everything's fine then run it.
4796 *
4797 * If "unit" is allocated, then bump its reference count
4798 */
4799static void autorun_devices(int part)
4800{
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004801 mdk_rdev_t *rdev0, *rdev, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004802 mddev_t *mddev;
4803 char b[BDEVNAME_SIZE];
4804
4805 printk(KERN_INFO "md: autorun ...\n");
4806 while (!list_empty(&pending_raid_disks)) {
NeilBrowne8703fe2006-10-03 01:15:59 -07004807 int unit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004808 dev_t dev;
NeilBrownad01c9e2006-03-27 01:18:07 -08004809 LIST_HEAD(candidates);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004810 rdev0 = list_entry(pending_raid_disks.next,
4811 mdk_rdev_t, same_set);
4812
4813 printk(KERN_INFO "md: considering %s ...\n",
4814 bdevname(rdev0->bdev,b));
4815 INIT_LIST_HEAD(&candidates);
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004816 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004817 if (super_90_load(rdev, rdev0, 0) >= 0) {
4818 printk(KERN_INFO "md: adding %s ...\n",
4819 bdevname(rdev->bdev,b));
4820 list_move(&rdev->same_set, &candidates);
4821 }
4822 /*
4823 * now we have a set of devices, with all of them having
4824 * mostly sane superblocks. It's time to allocate the
4825 * mddev.
4826 */
NeilBrowne8703fe2006-10-03 01:15:59 -07004827 if (part) {
4828 dev = MKDEV(mdp_major,
4829 rdev0->preferred_minor << MdpMinorShift);
4830 unit = MINOR(dev) >> MdpMinorShift;
4831 } else {
4832 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4833 unit = MINOR(dev);
4834 }
4835 if (rdev0->preferred_minor != unit) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004836 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4837 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4838 break;
4839 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004840
4841 md_probe(dev, NULL, NULL);
4842 mddev = mddev_find(dev);
Neil Brown9bbbca32008-06-28 08:31:17 +10004843 if (!mddev || !mddev->gendisk) {
4844 if (mddev)
4845 mddev_put(mddev);
4846 printk(KERN_ERR
Linus Torvalds1da177e2005-04-16 15:20:36 -07004847 "md: cannot allocate memory for md drive.\n");
4848 break;
4849 }
4850 if (mddev_lock(mddev))
4851 printk(KERN_WARNING "md: %s locked, cannot run\n",
4852 mdname(mddev));
4853 else if (mddev->raid_disks || mddev->major_version
4854 || !list_empty(&mddev->disks)) {
4855 printk(KERN_WARNING
4856 "md: %s already running, cannot run %s\n",
4857 mdname(mddev), bdevname(rdev0->bdev,b));
4858 mddev_unlock(mddev);
4859 } else {
4860 printk(KERN_INFO "md: created %s\n", mdname(mddev));
NeilBrown1ec4a932008-02-06 01:39:53 -08004861 mddev->persistent = 1;
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004862 rdev_for_each_list(rdev, tmp, &candidates) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004863 list_del_init(&rdev->same_set);
4864 if (bind_rdev_to_array(rdev, mddev))
4865 export_rdev(rdev);
4866 }
4867 autorun_array(mddev);
4868 mddev_unlock(mddev);
4869 }
4870 /* on success, candidates will be empty, on error
4871 * it won't...
4872 */
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004873 rdev_for_each_list(rdev, tmp, &candidates) {
NeilBrown4b809912008-07-21 17:05:25 +10004874 list_del_init(&rdev->same_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004875 export_rdev(rdev);
NeilBrown4b809912008-07-21 17:05:25 +10004876 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004877 mddev_put(mddev);
4878 }
4879 printk(KERN_INFO "md: ... autorun DONE.\n");
4880}
Jeff Garzikfdee8ae2006-12-10 02:20:50 -08004881#endif /* !MODULE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004882
Linus Torvalds1da177e2005-04-16 15:20:36 -07004883static int get_version(void __user * arg)
4884{
4885 mdu_version_t ver;
4886
4887 ver.major = MD_MAJOR_VERSION;
4888 ver.minor = MD_MINOR_VERSION;
4889 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4890
4891 if (copy_to_user(arg, &ver, sizeof(ver)))
4892 return -EFAULT;
4893
4894 return 0;
4895}
4896
4897static int get_array_info(mddev_t * mddev, void __user * arg)
4898{
4899 mdu_array_info_t info;
NeilBrowna9f326e2009-09-23 18:06:41 +10004900 int nr,working,insync,failed,spare;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004901 mdk_rdev_t *rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004902
NeilBrowna9f326e2009-09-23 18:06:41 +10004903 nr=working=insync=failed=spare=0;
Cheng Renquan159ec1f2009-01-09 08:31:08 +11004904 list_for_each_entry(rdev, &mddev->disks, same_set) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004905 nr++;
NeilBrownb2d444d2005-11-08 21:39:31 -08004906 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004907 failed++;
4908 else {
4909 working++;
NeilBrownb2d444d2005-11-08 21:39:31 -08004910 if (test_bit(In_sync, &rdev->flags))
NeilBrowna9f326e2009-09-23 18:06:41 +10004911 insync++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004912 else
4913 spare++;
4914 }
4915 }
4916
4917 info.major_version = mddev->major_version;
4918 info.minor_version = mddev->minor_version;
4919 info.patch_version = MD_PATCHLEVEL_VERSION;
4920 info.ctime = mddev->ctime;
4921 info.level = mddev->level;
Andre Noll58c0fed2009-03-31 14:33:13 +11004922 info.size = mddev->dev_sectors / 2;
4923 if (info.size != mddev->dev_sectors / 2) /* overflow */
NeilBrown284ae7c2006-02-03 03:03:40 -08004924 info.size = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004925 info.nr_disks = nr;
4926 info.raid_disks = mddev->raid_disks;
4927 info.md_minor = mddev->md_minor;
4928 info.not_persistent= !mddev->persistent;
4929
4930 info.utime = mddev->utime;
4931 info.state = 0;
4932 if (mddev->in_sync)
4933 info.state = (1<<MD_SB_CLEAN);
NeilBrownc3d97142009-12-14 12:49:52 +11004934 if (mddev->bitmap && mddev->bitmap_info.offset)
NeilBrown36fa3062005-09-09 16:23:45 -07004935 info.state = (1<<MD_SB_BITMAP_PRESENT);
NeilBrowna9f326e2009-09-23 18:06:41 +10004936 info.active_disks = insync;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004937 info.working_disks = working;
4938 info.failed_disks = failed;
4939 info.spare_disks = spare;
4940
4941 info.layout = mddev->layout;
Andre Noll9d8f0362009-06-18 08:45:01 +10004942 info.chunk_size = mddev->chunk_sectors << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004943
4944 if (copy_to_user(arg, &info, sizeof(info)))
4945 return -EFAULT;
4946
4947 return 0;
4948}
4949
viro@ZenIV.linux.org.uk87162a22005-09-09 20:36:43 +01004950static int get_bitmap_file(mddev_t * mddev, void __user * arg)
NeilBrown32a76272005-06-21 17:17:14 -07004951{
4952 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4953 char *ptr, *buf = NULL;
4954 int err = -ENOMEM;
4955
Dan Williamsb5470dc2008-06-27 21:44:04 -07004956 if (md_allow_write(mddev))
4957 file = kmalloc(sizeof(*file), GFP_NOIO);
4958 else
4959 file = kmalloc(sizeof(*file), GFP_KERNEL);
NeilBrown2a2275d2007-01-26 00:57:11 -08004960
NeilBrown32a76272005-06-21 17:17:14 -07004961 if (!file)
4962 goto out;
4963
4964 /* bitmap disabled, zero the first byte and copy out */
4965 if (!mddev->bitmap || !mddev->bitmap->file) {
4966 file->pathname[0] = '\0';
4967 goto copy_out;
4968 }
4969
4970 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4971 if (!buf)
4972 goto out;
4973
Christoph Hellwig6bcfd602008-05-23 13:04:34 -07004974 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4975 if (IS_ERR(ptr))
NeilBrown32a76272005-06-21 17:17:14 -07004976 goto out;
4977
4978 strcpy(file->pathname, ptr);
4979
4980copy_out:
4981 err = 0;
4982 if (copy_to_user(arg, file, sizeof(*file)))
4983 err = -EFAULT;
4984out:
4985 kfree(buf);
4986 kfree(file);
4987 return err;
4988}
4989
Linus Torvalds1da177e2005-04-16 15:20:36 -07004990static int get_disk_info(mddev_t * mddev, void __user * arg)
4991{
4992 mdu_disk_info_t info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004993 mdk_rdev_t *rdev;
4994
4995 if (copy_from_user(&info, arg, sizeof(info)))
4996 return -EFAULT;
4997
Andre Noll26ef3792008-07-11 22:02:21 +10004998 rdev = find_rdev_nr(mddev, info.number);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004999 if (rdev) {
5000 info.major = MAJOR(rdev->bdev->bd_dev);
5001 info.minor = MINOR(rdev->bdev->bd_dev);
5002 info.raid_disk = rdev->raid_disk;
5003 info.state = 0;
NeilBrownb2d444d2005-11-08 21:39:31 -08005004 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005005 info.state |= (1<<MD_DISK_FAULTY);
NeilBrownb2d444d2005-11-08 21:39:31 -08005006 else if (test_bit(In_sync, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005007 info.state |= (1<<MD_DISK_ACTIVE);
5008 info.state |= (1<<MD_DISK_SYNC);
5009 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -07005010 if (test_bit(WriteMostly, &rdev->flags))
5011 info.state |= (1<<MD_DISK_WRITEMOSTLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005012 } else {
5013 info.major = info.minor = 0;
5014 info.raid_disk = -1;
5015 info.state = (1<<MD_DISK_REMOVED);
5016 }
5017
5018 if (copy_to_user(arg, &info, sizeof(info)))
5019 return -EFAULT;
5020
5021 return 0;
5022}
5023
5024static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
5025{
5026 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
5027 mdk_rdev_t *rdev;
5028 dev_t dev = MKDEV(info->major,info->minor);
5029
5030 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
5031 return -EOVERFLOW;
5032
5033 if (!mddev->raid_disks) {
5034 int err;
5035 /* expecting a device which has a superblock */
5036 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
5037 if (IS_ERR(rdev)) {
5038 printk(KERN_WARNING
5039 "md: md_import_device returned %ld\n",
5040 PTR_ERR(rdev));
5041 return PTR_ERR(rdev);
5042 }
5043 if (!list_empty(&mddev->disks)) {
5044 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
5045 mdk_rdev_t, same_set);
NeilBrowna9f326e2009-09-23 18:06:41 +10005046 err = super_types[mddev->major_version]
Linus Torvalds1da177e2005-04-16 15:20:36 -07005047 .load_super(rdev, rdev0, mddev->minor_version);
5048 if (err < 0) {
5049 printk(KERN_WARNING
5050 "md: %s has different UUID to %s\n",
5051 bdevname(rdev->bdev,b),
5052 bdevname(rdev0->bdev,b2));
5053 export_rdev(rdev);
5054 return -EINVAL;
5055 }
5056 }
5057 err = bind_rdev_to_array(rdev, mddev);
5058 if (err)
5059 export_rdev(rdev);
5060 return err;
5061 }
5062
5063 /*
5064 * add_new_disk can be used once the array is assembled
5065 * to add "hot spares". They must already have a superblock
5066 * written
5067 */
5068 if (mddev->pers) {
5069 int err;
5070 if (!mddev->pers->hot_add_disk) {
5071 printk(KERN_WARNING
5072 "%s: personality does not support diskops!\n",
5073 mdname(mddev));
5074 return -EINVAL;
5075 }
NeilBrown7b1e35f2005-09-09 16:23:50 -07005076 if (mddev->persistent)
5077 rdev = md_import_device(dev, mddev->major_version,
5078 mddev->minor_version);
5079 else
5080 rdev = md_import_device(dev, -1, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005081 if (IS_ERR(rdev)) {
5082 printk(KERN_WARNING
5083 "md: md_import_device returned %ld\n",
5084 PTR_ERR(rdev));
5085 return PTR_ERR(rdev);
5086 }
NeilBrown41158c72005-06-21 17:17:25 -07005087 /* set save_raid_disk if appropriate */
5088 if (!mddev->persistent) {
5089 if (info->state & (1<<MD_DISK_SYNC) &&
5090 info->raid_disk < mddev->raid_disks)
5091 rdev->raid_disk = info->raid_disk;
5092 else
5093 rdev->raid_disk = -1;
5094 } else
5095 super_types[mddev->major_version].
5096 validate_super(mddev, rdev);
5097 rdev->saved_raid_disk = rdev->raid_disk;
5098
NeilBrownb2d444d2005-11-08 21:39:31 -08005099 clear_bit(In_sync, &rdev->flags); /* just to be sure */
NeilBrown8ddf9ef2005-09-09 16:23:45 -07005100 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5101 set_bit(WriteMostly, &rdev->flags);
NeilBrown575a80f2009-03-31 14:33:13 +11005102 else
5103 clear_bit(WriteMostly, &rdev->flags);
NeilBrown8ddf9ef2005-09-09 16:23:45 -07005104
Linus Torvalds1da177e2005-04-16 15:20:36 -07005105 rdev->raid_disk = -1;
5106 err = bind_rdev_to_array(rdev, mddev);
NeilBrown7c7546c2006-06-26 00:27:41 -07005107 if (!err && !mddev->pers->hot_remove_disk) {
5108 /* If there is hot_add_disk but no hot_remove_disk
5109 * then added disks for geometry changes,
5110 * and should be added immediately.
5111 */
5112 super_types[mddev->major_version].
5113 validate_super(mddev, rdev);
5114 err = mddev->pers->hot_add_disk(mddev, rdev);
5115 if (err)
5116 unbind_rdev_from_array(rdev);
5117 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005118 if (err)
5119 export_rdev(rdev);
Neil Brown52664732008-06-28 08:31:44 +10005120 else
NeilBrown3c0ee632008-10-21 13:25:28 +11005121 sysfs_notify_dirent(rdev->sysfs_state);
NeilBrownc3617772005-06-21 17:17:10 -07005122
NeilBrown17571282006-12-10 02:20:52 -08005123 md_update_sb(mddev, 1);
Neil Brown72a23c22008-06-28 08:31:41 +10005124 if (mddev->degraded)
5125 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
NeilBrownc3617772005-06-21 17:17:10 -07005126 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown005eca52005-08-22 13:11:08 -07005127 md_wakeup_thread(mddev->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005128 return err;
5129 }
5130
5131 /* otherwise, add_new_disk is only allowed
5132 * for major_version==0 superblocks
5133 */
5134 if (mddev->major_version != 0) {
5135 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
5136 mdname(mddev));
5137 return -EINVAL;
5138 }
5139
5140 if (!(info->state & (1<<MD_DISK_FAULTY))) {
5141 int err;
NeilBrownd710e132008-10-13 11:55:12 +11005142 rdev = md_import_device(dev, -1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005143 if (IS_ERR(rdev)) {
5144 printk(KERN_WARNING
5145 "md: error, md_import_device() returned %ld\n",
5146 PTR_ERR(rdev));
5147 return PTR_ERR(rdev);
5148 }
5149 rdev->desc_nr = info->number;
5150 if (info->raid_disk < mddev->raid_disks)
5151 rdev->raid_disk = info->raid_disk;
5152 else
5153 rdev->raid_disk = -1;
5154
Linus Torvalds1da177e2005-04-16 15:20:36 -07005155 if (rdev->raid_disk < mddev->raid_disks)
NeilBrownb2d444d2005-11-08 21:39:31 -08005156 if (info->state & (1<<MD_DISK_SYNC))
5157 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005158
NeilBrown8ddf9ef2005-09-09 16:23:45 -07005159 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
5160 set_bit(WriteMostly, &rdev->flags);
5161
Linus Torvalds1da177e2005-04-16 15:20:36 -07005162 if (!mddev->persistent) {
5163 printk(KERN_INFO "md: nonpersistent superblock ...\n");
Andre Noll0f420352008-07-11 22:02:23 +10005164 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005165 } else
Andre Noll0f420352008-07-11 22:02:23 +10005166 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
NeilBrown8190e752009-06-18 08:48:58 +10005167 rdev->sectors = rdev->sb_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005168
NeilBrown2bf071b2006-01-06 00:20:55 -08005169 err = bind_rdev_to_array(rdev, mddev);
5170 if (err) {
5171 export_rdev(rdev);
5172 return err;
5173 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005174 }
5175
5176 return 0;
5177}
5178
5179static int hot_remove_disk(mddev_t * mddev, dev_t dev)
5180{
5181 char b[BDEVNAME_SIZE];
5182 mdk_rdev_t *rdev;
5183
Linus Torvalds1da177e2005-04-16 15:20:36 -07005184 rdev = find_rdev(mddev, dev);
5185 if (!rdev)
5186 return -ENXIO;
5187
5188 if (rdev->raid_disk >= 0)
5189 goto busy;
5190
5191 kick_rdev_from_array(rdev);
NeilBrown850b2b42006-10-03 01:15:46 -07005192 md_update_sb(mddev, 1);
NeilBrownd7603b72006-01-06 00:20:30 -08005193 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005194
5195 return 0;
5196busy:
Nick Andrewfdefa4d2008-04-21 22:42:58 +00005197 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07005198 bdevname(rdev->bdev,b), mdname(mddev));
5199 return -EBUSY;
5200}
5201
5202static int hot_add_disk(mddev_t * mddev, dev_t dev)
5203{
5204 char b[BDEVNAME_SIZE];
5205 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005206 mdk_rdev_t *rdev;
5207
5208 if (!mddev->pers)
5209 return -ENODEV;
5210
5211 if (mddev->major_version != 0) {
5212 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
5213 " version-0 superblocks.\n",
5214 mdname(mddev));
5215 return -EINVAL;
5216 }
5217 if (!mddev->pers->hot_add_disk) {
5218 printk(KERN_WARNING
5219 "%s: personality does not support diskops!\n",
5220 mdname(mddev));
5221 return -EINVAL;
5222 }
5223
NeilBrownd710e132008-10-13 11:55:12 +11005224 rdev = md_import_device(dev, -1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005225 if (IS_ERR(rdev)) {
5226 printk(KERN_WARNING
5227 "md: error, md_import_device() returned %ld\n",
5228 PTR_ERR(rdev));
5229 return -EINVAL;
5230 }
5231
5232 if (mddev->persistent)
Andre Noll0f420352008-07-11 22:02:23 +10005233 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005234 else
Andre Noll0f420352008-07-11 22:02:23 +10005235 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005236
NeilBrown8190e752009-06-18 08:48:58 +10005237 rdev->sectors = rdev->sb_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005238
NeilBrownb2d444d2005-11-08 21:39:31 -08005239 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005240 printk(KERN_WARNING
5241 "md: can not hot-add faulty %s disk to %s!\n",
5242 bdevname(rdev->bdev,b), mdname(mddev));
5243 err = -EINVAL;
5244 goto abort_export;
5245 }
NeilBrownb2d444d2005-11-08 21:39:31 -08005246 clear_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005247 rdev->desc_nr = -1;
NeilBrown58427302006-10-06 00:44:04 -07005248 rdev->saved_raid_disk = -1;
NeilBrown2bf071b2006-01-06 00:20:55 -08005249 err = bind_rdev_to_array(rdev, mddev);
5250 if (err)
5251 goto abort_export;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005252
5253 /*
5254 * The rest should better be atomic, we can have disk failures
5255 * noticed in interrupt contexts ...
5256 */
5257
Linus Torvalds1da177e2005-04-16 15:20:36 -07005258 rdev->raid_disk = -1;
5259
NeilBrown850b2b42006-10-03 01:15:46 -07005260 md_update_sb(mddev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005261
5262 /*
5263 * Kick recovery, maybe this spare has to be added to the
5264 * array immediately.
5265 */
5266 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5267 md_wakeup_thread(mddev->thread);
NeilBrownd7603b72006-01-06 00:20:30 -08005268 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005269 return 0;
5270
Linus Torvalds1da177e2005-04-16 15:20:36 -07005271abort_export:
5272 export_rdev(rdev);
5273 return err;
5274}
5275
NeilBrown32a76272005-06-21 17:17:14 -07005276static int set_bitmap_file(mddev_t *mddev, int fd)
5277{
5278 int err;
5279
NeilBrown36fa3062005-09-09 16:23:45 -07005280 if (mddev->pers) {
5281 if (!mddev->pers->quiesce)
5282 return -EBUSY;
5283 if (mddev->recovery || mddev->sync_thread)
5284 return -EBUSY;
5285 /* we should be able to change the bitmap.. */
NeilBrown32a76272005-06-21 17:17:14 -07005286 }
5287
NeilBrown36fa3062005-09-09 16:23:45 -07005288
5289 if (fd >= 0) {
5290 if (mddev->bitmap)
5291 return -EEXIST; /* cannot add when bitmap is present */
NeilBrownc3d97142009-12-14 12:49:52 +11005292 mddev->bitmap_info.file = fget(fd);
NeilBrown36fa3062005-09-09 16:23:45 -07005293
NeilBrownc3d97142009-12-14 12:49:52 +11005294 if (mddev->bitmap_info.file == NULL) {
NeilBrown36fa3062005-09-09 16:23:45 -07005295 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5296 mdname(mddev));
5297 return -EBADF;
5298 }
5299
NeilBrownc3d97142009-12-14 12:49:52 +11005300 err = deny_bitmap_write_access(mddev->bitmap_info.file);
NeilBrown36fa3062005-09-09 16:23:45 -07005301 if (err) {
5302 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5303 mdname(mddev));
NeilBrownc3d97142009-12-14 12:49:52 +11005304 fput(mddev->bitmap_info.file);
5305 mddev->bitmap_info.file = NULL;
NeilBrown36fa3062005-09-09 16:23:45 -07005306 return err;
5307 }
NeilBrownc3d97142009-12-14 12:49:52 +11005308 mddev->bitmap_info.offset = 0; /* file overrides offset */
NeilBrown36fa3062005-09-09 16:23:45 -07005309 } else if (mddev->bitmap == NULL)
5310 return -ENOENT; /* cannot remove what isn't there */
5311 err = 0;
5312 if (mddev->pers) {
5313 mddev->pers->quiesce(mddev, 1);
5314 if (fd >= 0)
5315 err = bitmap_create(mddev);
NeilBrownd7375ab2006-06-26 00:27:43 -07005316 if (fd < 0 || err) {
NeilBrown36fa3062005-09-09 16:23:45 -07005317 bitmap_destroy(mddev);
NeilBrownd7375ab2006-06-26 00:27:43 -07005318 fd = -1; /* make sure to put the file */
5319 }
NeilBrown36fa3062005-09-09 16:23:45 -07005320 mddev->pers->quiesce(mddev, 0);
NeilBrownd7375ab2006-06-26 00:27:43 -07005321 }
5322 if (fd < 0) {
NeilBrownc3d97142009-12-14 12:49:52 +11005323 if (mddev->bitmap_info.file) {
5324 restore_bitmap_write_access(mddev->bitmap_info.file);
5325 fput(mddev->bitmap_info.file);
NeilBrownacc55e22006-06-26 00:27:47 -07005326 }
NeilBrownc3d97142009-12-14 12:49:52 +11005327 mddev->bitmap_info.file = NULL;
NeilBrown36fa3062005-09-09 16:23:45 -07005328 }
5329
NeilBrown32a76272005-06-21 17:17:14 -07005330 return err;
5331}
5332
Linus Torvalds1da177e2005-04-16 15:20:36 -07005333/*
5334 * set_array_info is used two different ways
5335 * The original usage is when creating a new array.
5336 * In this usage, raid_disks is > 0 and it together with
5337 * level, size, not_persistent,layout,chunksize determine the
5338 * shape of the array.
5339 * This will always create an array with a type-0.90.0 superblock.
5340 * The newer usage is when assembling an array.
5341 * In this case raid_disks will be 0, and the major_version field is
5342 * use to determine which style super-blocks are to be found on the devices.
5343 * The minor and patch _version numbers are also kept incase the
5344 * super_block handler wishes to interpret them.
5345 */
5346static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5347{
5348
5349 if (info->raid_disks == 0) {
5350 /* just setting version number for superblock loading */
5351 if (info->major_version < 0 ||
Ahmed S. Darwish50511da2007-05-09 02:35:34 -07005352 info->major_version >= ARRAY_SIZE(super_types) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07005353 super_types[info->major_version].name == NULL) {
5354 /* maybe try to auto-load a module? */
5355 printk(KERN_INFO
5356 "md: superblock version %d not known\n",
5357 info->major_version);
5358 return -EINVAL;
5359 }
5360 mddev->major_version = info->major_version;
5361 mddev->minor_version = info->minor_version;
5362 mddev->patch_version = info->patch_version;
NeilBrown3f9d7b02006-12-22 01:11:41 -08005363 mddev->persistent = !info->not_persistent;
NeilBrowncbd19982009-12-30 12:08:49 +11005364 /* ensure mddev_put doesn't delete this now that there
5365 * is some minimal configuration.
5366 */
5367 mddev->ctime = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005368 return 0;
5369 }
5370 mddev->major_version = MD_MAJOR_VERSION;
5371 mddev->minor_version = MD_MINOR_VERSION;
5372 mddev->patch_version = MD_PATCHLEVEL_VERSION;
5373 mddev->ctime = get_seconds();
5374
5375 mddev->level = info->level;
NeilBrown17115e02006-01-16 22:14:57 -08005376 mddev->clevel[0] = 0;
Andre Noll58c0fed2009-03-31 14:33:13 +11005377 mddev->dev_sectors = 2 * (sector_t)info->size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005378 mddev->raid_disks = info->raid_disks;
5379 /* don't set md_minor, it is determined by which /dev/md* was
5380 * openned
5381 */
5382 if (info->state & (1<<MD_SB_CLEAN))
5383 mddev->recovery_cp = MaxSector;
5384 else
5385 mddev->recovery_cp = 0;
5386 mddev->persistent = ! info->not_persistent;
NeilBrowne6910632008-02-06 01:39:51 -08005387 mddev->external = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005388
5389 mddev->layout = info->layout;
Andre Noll9d8f0362009-06-18 08:45:01 +10005390 mddev->chunk_sectors = info->chunk_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005391
5392 mddev->max_disks = MD_SB_DISKS;
5393
NeilBrowne6910632008-02-06 01:39:51 -08005394 if (mddev->persistent)
5395 mddev->flags = 0;
NeilBrown850b2b42006-10-03 01:15:46 -07005396 set_bit(MD_CHANGE_DEVS, &mddev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005397
NeilBrownc3d97142009-12-14 12:49:52 +11005398 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
5399 mddev->bitmap_info.offset = 0;
NeilBrownb2a27032005-11-28 13:44:12 -08005400
NeilBrownf6705572006-03-27 01:18:11 -08005401 mddev->reshape_position = MaxSector;
5402
Linus Torvalds1da177e2005-04-16 15:20:36 -07005403 /*
5404 * Generate a 128 bit UUID
5405 */
5406 get_random_bytes(mddev->uuid, 16);
5407
NeilBrownf6705572006-03-27 01:18:11 -08005408 mddev->new_level = mddev->level;
Andre Noll664e7c42009-06-18 08:45:27 +10005409 mddev->new_chunk_sectors = mddev->chunk_sectors;
NeilBrownf6705572006-03-27 01:18:11 -08005410 mddev->new_layout = mddev->layout;
5411 mddev->delta_disks = 0;
5412
Linus Torvalds1da177e2005-04-16 15:20:36 -07005413 return 0;
5414}
5415
Dan Williams1f403622009-03-31 14:59:03 +11005416void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5417{
Dan Williamsb522adc2009-03-31 15:00:31 +11005418 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5419
5420 if (mddev->external_size)
5421 return;
5422
Dan Williams1f403622009-03-31 14:59:03 +11005423 mddev->array_sectors = array_sectors;
5424}
5425EXPORT_SYMBOL(md_set_array_sectors);
5426
Andre Nolld71f9f82008-07-11 22:02:22 +10005427static int update_size(mddev_t *mddev, sector_t num_sectors)
NeilBrowna35b0d692006-01-06 00:20:49 -08005428{
Cheng Renquan159ec1f2009-01-09 08:31:08 +11005429 mdk_rdev_t *rdev;
NeilBrowna35b0d692006-01-06 00:20:49 -08005430 int rv;
Andre Nolld71f9f82008-07-11 22:02:22 +10005431 int fit = (num_sectors == 0);
NeilBrowna35b0d692006-01-06 00:20:49 -08005432
5433 if (mddev->pers->resize == NULL)
5434 return -EINVAL;
Andre Nolld71f9f82008-07-11 22:02:22 +10005435 /* The "num_sectors" is the number of sectors of each device that
5436 * is used. This can only make sense for arrays with redundancy.
5437 * linear and raid0 always use whatever space is available. We can only
5438 * consider changing this number if no resync or reconstruction is
5439 * happening, and if the new size is acceptable. It must fit before the
Andre Noll0f420352008-07-11 22:02:23 +10005440 * sb_start or, if that is <data_offset, it must fit before the size
Andre Nolld71f9f82008-07-11 22:02:22 +10005441 * of each device. If num_sectors is zero, we find the largest size
5442 * that fits.
5443
NeilBrowna35b0d692006-01-06 00:20:49 -08005444 */
5445 if (mddev->sync_thread)
5446 return -EBUSY;
NeilBrowndba034e2008-08-05 15:54:13 +10005447 if (mddev->bitmap)
5448 /* Sorry, cannot grow a bitmap yet, just remove it,
5449 * grow, and re-add.
5450 */
5451 return -EBUSY;
Cheng Renquan159ec1f2009-01-09 08:31:08 +11005452 list_for_each_entry(rdev, &mddev->disks, same_set) {
Andre Nolldd8ac332009-03-31 14:33:13 +11005453 sector_t avail = rdev->sectors;
NeilBrown01ab5662006-10-28 10:38:30 -07005454
Andre Nolld71f9f82008-07-11 22:02:22 +10005455 if (fit && (num_sectors == 0 || num_sectors > avail))
5456 num_sectors = avail;
5457 if (avail < num_sectors)
NeilBrowna35b0d692006-01-06 00:20:49 -08005458 return -ENOSPC;
5459 }
Andre Nolld71f9f82008-07-11 22:02:22 +10005460 rv = mddev->pers->resize(mddev, num_sectors);
NeilBrown449aad32009-08-03 10:59:58 +10005461 if (!rv)
5462 revalidate_disk(mddev->gendisk);
NeilBrowna35b0d692006-01-06 00:20:49 -08005463 return rv;
5464}
5465
NeilBrownda943b992006-01-06 00:20:54 -08005466static int update_raid_disks(mddev_t *mddev, int raid_disks)
5467{
5468 int rv;
5469 /* change the number of raid disks */
NeilBrown63c70c42006-03-27 01:18:13 -08005470 if (mddev->pers->check_reshape == NULL)
NeilBrownda943b992006-01-06 00:20:54 -08005471 return -EINVAL;
5472 if (raid_disks <= 0 ||
NeilBrown233fca32010-04-14 17:02:09 +10005473 (mddev->max_disks && raid_disks >= mddev->max_disks))
NeilBrownda943b992006-01-06 00:20:54 -08005474 return -EINVAL;
NeilBrown63c70c42006-03-27 01:18:13 -08005475 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
NeilBrownda943b992006-01-06 00:20:54 -08005476 return -EBUSY;
NeilBrown63c70c42006-03-27 01:18:13 -08005477 mddev->delta_disks = raid_disks - mddev->raid_disks;
5478
5479 rv = mddev->pers->check_reshape(mddev);
NeilBrownda943b992006-01-06 00:20:54 -08005480 return rv;
5481}
5482
5483
Linus Torvalds1da177e2005-04-16 15:20:36 -07005484/*
5485 * update_array_info is used to change the configuration of an
5486 * on-line array.
5487 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5488 * fields in the info are checked against the array.
5489 * Any differences that cannot be handled will cause an error.
5490 * Normally, only one change can be managed at a time.
5491 */
5492static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5493{
5494 int rv = 0;
5495 int cnt = 0;
NeilBrown36fa3062005-09-09 16:23:45 -07005496 int state = 0;
5497
5498 /* calculate expected state,ignoring low bits */
NeilBrownc3d97142009-12-14 12:49:52 +11005499 if (mddev->bitmap && mddev->bitmap_info.offset)
NeilBrown36fa3062005-09-09 16:23:45 -07005500 state |= (1 << MD_SB_BITMAP_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005501
5502 if (mddev->major_version != info->major_version ||
5503 mddev->minor_version != info->minor_version ||
5504/* mddev->patch_version != info->patch_version || */
5505 mddev->ctime != info->ctime ||
5506 mddev->level != info->level ||
5507/* mddev->layout != info->layout || */
5508 !mddev->persistent != info->not_persistent||
Andre Noll9d8f0362009-06-18 08:45:01 +10005509 mddev->chunk_sectors != info->chunk_size >> 9 ||
NeilBrown36fa3062005-09-09 16:23:45 -07005510 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5511 ((state^info->state) & 0xfffffe00)
5512 )
Linus Torvalds1da177e2005-04-16 15:20:36 -07005513 return -EINVAL;
5514 /* Check there is only one change */
Andre Noll58c0fed2009-03-31 14:33:13 +11005515 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5516 cnt++;
5517 if (mddev->raid_disks != info->raid_disks)
5518 cnt++;
5519 if (mddev->layout != info->layout)
5520 cnt++;
5521 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5522 cnt++;
5523 if (cnt == 0)
5524 return 0;
5525 if (cnt > 1)
5526 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005527
5528 if (mddev->layout != info->layout) {
5529 /* Change layout
5530 * we don't need to do anything at the md level, the
5531 * personality will take care of it all.
5532 */
NeilBrown50ac1682009-06-18 08:47:55 +10005533 if (mddev->pers->check_reshape == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005534 return -EINVAL;
NeilBrown597a7112009-06-18 08:47:42 +10005535 else {
5536 mddev->new_layout = info->layout;
NeilBrown50ac1682009-06-18 08:47:55 +10005537 rv = mddev->pers->check_reshape(mddev);
NeilBrown597a7112009-06-18 08:47:42 +10005538 if (rv)
5539 mddev->new_layout = mddev->layout;
5540 return rv;
5541 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005542 }
Andre Noll58c0fed2009-03-31 14:33:13 +11005543 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
Andre Nolld71f9f82008-07-11 22:02:22 +10005544 rv = update_size(mddev, (sector_t)info->size * 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005545
NeilBrownda943b992006-01-06 00:20:54 -08005546 if (mddev->raid_disks != info->raid_disks)
5547 rv = update_raid_disks(mddev, info->raid_disks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005548
NeilBrown36fa3062005-09-09 16:23:45 -07005549 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5550 if (mddev->pers->quiesce == NULL)
5551 return -EINVAL;
5552 if (mddev->recovery || mddev->sync_thread)
5553 return -EBUSY;
5554 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5555 /* add the bitmap */
5556 if (mddev->bitmap)
5557 return -EEXIST;
NeilBrownc3d97142009-12-14 12:49:52 +11005558 if (mddev->bitmap_info.default_offset == 0)
NeilBrown36fa3062005-09-09 16:23:45 -07005559 return -EINVAL;
NeilBrownc3d97142009-12-14 12:49:52 +11005560 mddev->bitmap_info.offset =
5561 mddev->bitmap_info.default_offset;
NeilBrown36fa3062005-09-09 16:23:45 -07005562 mddev->pers->quiesce(mddev, 1);
5563 rv = bitmap_create(mddev);
5564 if (rv)
5565 bitmap_destroy(mddev);
5566 mddev->pers->quiesce(mddev, 0);
5567 } else {
5568 /* remove the bitmap */
5569 if (!mddev->bitmap)
5570 return -ENOENT;
5571 if (mddev->bitmap->file)
5572 return -EINVAL;
5573 mddev->pers->quiesce(mddev, 1);
5574 bitmap_destroy(mddev);
5575 mddev->pers->quiesce(mddev, 0);
NeilBrownc3d97142009-12-14 12:49:52 +11005576 mddev->bitmap_info.offset = 0;
NeilBrown36fa3062005-09-09 16:23:45 -07005577 }
5578 }
NeilBrown850b2b42006-10-03 01:15:46 -07005579 md_update_sb(mddev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005580 return rv;
5581}
5582
5583static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5584{
5585 mdk_rdev_t *rdev;
5586
5587 if (mddev->pers == NULL)
5588 return -ENODEV;
5589
5590 rdev = find_rdev(mddev, dev);
5591 if (!rdev)
5592 return -ENODEV;
5593
5594 md_error(mddev, rdev);
5595 return 0;
5596}
5597
Andre Noll2f9618c2008-04-25 18:57:58 +02005598/*
5599 * We have a problem here : there is no easy way to give a CHS
5600 * virtual geometry. We currently pretend that we have a 2 heads
5601 * 4 sectors (with a BIG number of cylinders...). This drives
5602 * dosfs just mad... ;-)
5603 */
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08005604static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5605{
5606 mddev_t *mddev = bdev->bd_disk->private_data;
5607
5608 geo->heads = 2;
5609 geo->sectors = 4;
NeilBrown49ce6ce2010-03-29 10:51:42 +11005610 geo->cylinders = mddev->array_sectors / 8;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08005611 return 0;
5612}
5613
Al Viroa39907f2008-03-02 10:31:15 -05005614static int md_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005615 unsigned int cmd, unsigned long arg)
5616{
5617 int err = 0;
5618 void __user *argp = (void __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005619 mddev_t *mddev = NULL;
Dan Williamse2218352010-05-12 08:25:37 +10005620 int ro;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005621
5622 if (!capable(CAP_SYS_ADMIN))
5623 return -EACCES;
5624
5625 /*
5626 * Commands dealing with the RAID driver but not any
5627 * particular array:
5628 */
5629 switch (cmd)
5630 {
5631 case RAID_VERSION:
5632 err = get_version(argp);
5633 goto done;
5634
5635 case PRINT_RAID_DEBUG:
5636 err = 0;
5637 md_print_devices();
5638 goto done;
5639
5640#ifndef MODULE
5641 case RAID_AUTORUN:
5642 err = 0;
5643 autostart_arrays(arg);
5644 goto done;
5645#endif
5646 default:;
5647 }
5648
5649 /*
5650 * Commands creating/starting a new array:
5651 */
5652
Al Viroa39907f2008-03-02 10:31:15 -05005653 mddev = bdev->bd_disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005654
5655 if (!mddev) {
5656 BUG();
5657 goto abort;
5658 }
5659
Linus Torvalds1da177e2005-04-16 15:20:36 -07005660 err = mddev_lock(mddev);
5661 if (err) {
5662 printk(KERN_INFO
5663 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5664 err, cmd);
5665 goto abort;
5666 }
5667
5668 switch (cmd)
5669 {
5670 case SET_ARRAY_INFO:
5671 {
5672 mdu_array_info_t info;
5673 if (!arg)
5674 memset(&info, 0, sizeof(info));
5675 else if (copy_from_user(&info, argp, sizeof(info))) {
5676 err = -EFAULT;
5677 goto abort_unlock;
5678 }
5679 if (mddev->pers) {
5680 err = update_array_info(mddev, &info);
5681 if (err) {
5682 printk(KERN_WARNING "md: couldn't update"
5683 " array info. %d\n", err);
5684 goto abort_unlock;
5685 }
5686 goto done_unlock;
5687 }
5688 if (!list_empty(&mddev->disks)) {
5689 printk(KERN_WARNING
5690 "md: array %s already has disks!\n",
5691 mdname(mddev));
5692 err = -EBUSY;
5693 goto abort_unlock;
5694 }
5695 if (mddev->raid_disks) {
5696 printk(KERN_WARNING
5697 "md: array %s already initialised!\n",
5698 mdname(mddev));
5699 err = -EBUSY;
5700 goto abort_unlock;
5701 }
5702 err = set_array_info(mddev, &info);
5703 if (err) {
5704 printk(KERN_WARNING "md: couldn't set"
5705 " array info. %d\n", err);
5706 goto abort_unlock;
5707 }
5708 }
5709 goto done_unlock;
5710
5711 default:;
5712 }
5713
5714 /*
5715 * Commands querying/configuring an existing array:
5716 */
NeilBrown32a76272005-06-21 17:17:14 -07005717 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
NeilBrown3f9d7b02006-12-22 01:11:41 -08005718 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
NeilBrowna17184a2008-02-06 01:39:55 -08005719 if ((!mddev->raid_disks && !mddev->external)
5720 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5721 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5722 && cmd != GET_BITMAP_FILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005723 err = -ENODEV;
5724 goto abort_unlock;
5725 }
5726
5727 /*
5728 * Commands even a read-only array can execute:
5729 */
5730 switch (cmd)
5731 {
5732 case GET_ARRAY_INFO:
5733 err = get_array_info(mddev, argp);
5734 goto done_unlock;
5735
NeilBrown32a76272005-06-21 17:17:14 -07005736 case GET_BITMAP_FILE:
viro@ZenIV.linux.org.uk87162a22005-09-09 20:36:43 +01005737 err = get_bitmap_file(mddev, argp);
NeilBrown32a76272005-06-21 17:17:14 -07005738 goto done_unlock;
5739
Linus Torvalds1da177e2005-04-16 15:20:36 -07005740 case GET_DISK_INFO:
5741 err = get_disk_info(mddev, argp);
5742 goto done_unlock;
5743
5744 case RESTART_ARRAY_RW:
5745 err = restart_array(mddev);
5746 goto done_unlock;
5747
5748 case STOP_ARRAY:
NeilBrownd710e132008-10-13 11:55:12 +11005749 err = do_md_stop(mddev, 0, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005750 goto done_unlock;
5751
5752 case STOP_ARRAY_RO:
NeilBrowna4bd82d2010-03-29 13:23:10 +11005753 err = md_set_readonly(mddev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005754 goto done_unlock;
5755
Dan Williamse2218352010-05-12 08:25:37 +10005756 case BLKROSET:
5757 if (get_user(ro, (int __user *)(arg))) {
5758 err = -EFAULT;
5759 goto done_unlock;
5760 }
5761 err = -EINVAL;
5762
5763 /* if the bdev is going readonly the value of mddev->ro
5764 * does not matter, no writes are coming
5765 */
5766 if (ro)
5767 goto done_unlock;
5768
5769 /* are we are already prepared for writes? */
5770 if (mddev->ro != 1)
5771 goto done_unlock;
5772
5773 /* transitioning to readauto need only happen for
5774 * arrays that call md_write_start
5775 */
5776 if (mddev->pers) {
5777 err = restart_array(mddev);
5778 if (err == 0) {
5779 mddev->ro = 2;
5780 set_disk_ro(mddev->gendisk, 0);
5781 }
5782 }
5783 goto done_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005784 }
5785
5786 /*
5787 * The remaining ioctls are changing the state of the
NeilBrownf91de922005-11-08 21:39:36 -08005788 * superblock, so we do not allow them on read-only arrays.
5789 * However non-MD ioctls (e.g. get-size) will still come through
5790 * here and hit the 'default' below, so only disallow
5791 * 'md' ioctls, and switch to rw mode if started auto-readonly.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005792 */
Andre Nollbb57fc62008-04-25 19:06:35 +02005793 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
NeilBrownf91de922005-11-08 21:39:36 -08005794 if (mddev->ro == 2) {
5795 mddev->ro = 0;
NeilBrownb62b7592008-10-21 13:25:21 +11005796 sysfs_notify_dirent(mddev->sysfs_state);
Neil Brown0fd62b82008-06-28 08:31:36 +10005797 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5798 md_wakeup_thread(mddev->thread);
NeilBrownf91de922005-11-08 21:39:36 -08005799 } else {
5800 err = -EROFS;
5801 goto abort_unlock;
5802 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005803 }
5804
5805 switch (cmd)
5806 {
5807 case ADD_NEW_DISK:
5808 {
5809 mdu_disk_info_t info;
5810 if (copy_from_user(&info, argp, sizeof(info)))
5811 err = -EFAULT;
5812 else
5813 err = add_new_disk(mddev, &info);
5814 goto done_unlock;
5815 }
5816
5817 case HOT_REMOVE_DISK:
5818 err = hot_remove_disk(mddev, new_decode_dev(arg));
5819 goto done_unlock;
5820
5821 case HOT_ADD_DISK:
5822 err = hot_add_disk(mddev, new_decode_dev(arg));
5823 goto done_unlock;
5824
5825 case SET_DISK_FAULTY:
5826 err = set_disk_faulty(mddev, new_decode_dev(arg));
5827 goto done_unlock;
5828
5829 case RUN_ARRAY:
NeilBrownd710e132008-10-13 11:55:12 +11005830 err = do_md_run(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005831 goto done_unlock;
5832
NeilBrown32a76272005-06-21 17:17:14 -07005833 case SET_BITMAP_FILE:
5834 err = set_bitmap_file(mddev, (int)arg);
5835 goto done_unlock;
5836
Linus Torvalds1da177e2005-04-16 15:20:36 -07005837 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -07005838 err = -EINVAL;
5839 goto abort_unlock;
5840 }
5841
5842done_unlock:
5843abort_unlock:
NeilBrownd3374822009-01-09 08:31:10 +11005844 if (mddev->hold_active == UNTIL_IOCTL &&
5845 err != -EINVAL)
5846 mddev->hold_active = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005847 mddev_unlock(mddev);
5848
5849 return err;
5850done:
5851 if (err)
5852 MD_BUG();
5853abort:
5854 return err;
5855}
Arnd Bergmannaa98aa32009-12-14 12:50:05 +11005856#ifdef CONFIG_COMPAT
5857static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
5858 unsigned int cmd, unsigned long arg)
5859{
5860 switch (cmd) {
5861 case HOT_REMOVE_DISK:
5862 case HOT_ADD_DISK:
5863 case SET_DISK_FAULTY:
5864 case SET_BITMAP_FILE:
5865 /* These take in integer arg, do not convert */
5866 break;
5867 default:
5868 arg = (unsigned long)compat_ptr(arg);
5869 break;
5870 }
5871
5872 return md_ioctl(bdev, mode, cmd, arg);
5873}
5874#endif /* CONFIG_COMPAT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005875
Al Viroa39907f2008-03-02 10:31:15 -05005876static int md_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005877{
5878 /*
5879 * Succeed if we can lock the mddev, which confirms that
5880 * it isn't being stopped right now.
5881 */
NeilBrownd3374822009-01-09 08:31:10 +11005882 mddev_t *mddev = mddev_find(bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005883 int err;
5884
NeilBrownd3374822009-01-09 08:31:10 +11005885 if (mddev->gendisk != bdev->bd_disk) {
5886 /* we are racing with mddev_put which is discarding this
5887 * bd_disk.
5888 */
5889 mddev_put(mddev);
5890 /* Wait until bdev->bd_disk is definitely gone */
5891 flush_scheduled_work();
5892 /* Then retry the open from the top */
5893 return -ERESTARTSYS;
5894 }
5895 BUG_ON(mddev != bdev->bd_disk->private_data);
5896
NeilBrownc8c00a62009-08-10 12:50:52 +10005897 if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005898 goto out;
5899
5900 err = 0;
NeilBrownf2ea68c2008-07-21 17:05:25 +10005901 atomic_inc(&mddev->openers);
NeilBrownc8c00a62009-08-10 12:50:52 +10005902 mutex_unlock(&mddev->open_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005903
Linus Torvalds1da177e2005-04-16 15:20:36 -07005904 out:
5905 return err;
5906}
5907
Al Viroa39907f2008-03-02 10:31:15 -05005908static int md_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005909{
Al Viroa39907f2008-03-02 10:31:15 -05005910 mddev_t *mddev = disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005911
Eric Sesterhenn52e5f9d2006-10-03 23:33:23 +02005912 BUG_ON(!mddev);
NeilBrownf2ea68c2008-07-21 17:05:25 +10005913 atomic_dec(&mddev->openers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005914 mddev_put(mddev);
5915
5916 return 0;
5917}
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07005918static const struct block_device_operations md_fops =
Linus Torvalds1da177e2005-04-16 15:20:36 -07005919{
5920 .owner = THIS_MODULE,
Al Viroa39907f2008-03-02 10:31:15 -05005921 .open = md_open,
5922 .release = md_release,
NeilBrownb492b852009-05-26 12:57:36 +10005923 .ioctl = md_ioctl,
Arnd Bergmannaa98aa32009-12-14 12:50:05 +11005924#ifdef CONFIG_COMPAT
5925 .compat_ioctl = md_compat_ioctl,
5926#endif
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08005927 .getgeo = md_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005928};
5929
Adrian Bunk75c96f82005-05-05 16:16:09 -07005930static int md_thread(void * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005931{
5932 mdk_thread_t *thread = arg;
5933
Linus Torvalds1da177e2005-04-16 15:20:36 -07005934 /*
5935 * md_thread is a 'system-thread', it's priority should be very
5936 * high. We avoid resource deadlocks individually in each
5937 * raid personality. (RAID5 does preallocation) We also use RR and
5938 * the very same RT priority as kswapd, thus we will never get
5939 * into a priority inversion deadlock.
5940 *
5941 * we definitely have to have equal or higher priority than
5942 * bdflush, otherwise bdflush will deadlock if there are too
5943 * many dirty RAID5 blocks.
5944 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005945
NeilBrown6985c432005-10-19 21:23:47 -07005946 allow_signal(SIGKILL);
NeilBrowna6fb0932005-09-09 16:23:56 -07005947 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005948
NeilBrown93588e22005-11-15 00:09:12 -08005949 /* We need to wait INTERRUPTIBLE so that
5950 * we don't add to the load-average.
5951 * That means we need to be sure no signals are
5952 * pending
5953 */
5954 if (signal_pending(current))
5955 flush_signals(current);
5956
5957 wait_event_interruptible_timeout
5958 (thread->wqueue,
5959 test_bit(THREAD_WAKEUP, &thread->flags)
5960 || kthread_should_stop(),
5961 thread->timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005962
5963 clear_bit(THREAD_WAKEUP, &thread->flags);
5964
NeilBrown787453c2005-11-08 21:39:43 -08005965 thread->run(thread->mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005966 }
NeilBrowna6fb0932005-09-09 16:23:56 -07005967
Linus Torvalds1da177e2005-04-16 15:20:36 -07005968 return 0;
5969}
5970
5971void md_wakeup_thread(mdk_thread_t *thread)
5972{
5973 if (thread) {
5974 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5975 set_bit(THREAD_WAKEUP, &thread->flags);
5976 wake_up(&thread->wqueue);
5977 }
5978}
5979
5980mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5981 const char *name)
5982{
5983 mdk_thread_t *thread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005984
NeilBrown9ffae0c2006-01-06 00:20:32 -08005985 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005986 if (!thread)
5987 return NULL;
5988
Linus Torvalds1da177e2005-04-16 15:20:36 -07005989 init_waitqueue_head(&thread->wqueue);
5990
Linus Torvalds1da177e2005-04-16 15:20:36 -07005991 thread->run = run;
5992 thread->mddev = mddev;
NeilBrown32a76272005-06-21 17:17:14 -07005993 thread->timeout = MAX_SCHEDULE_TIMEOUT;
NeilBrown0da3c612009-09-23 18:09:45 +10005994 thread->tsk = kthread_run(md_thread, thread,
5995 "%s_%s",
5996 mdname(thread->mddev),
5997 name ?: mddev->pers->name);
NeilBrowna6fb0932005-09-09 16:23:56 -07005998 if (IS_ERR(thread->tsk)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005999 kfree(thread);
6000 return NULL;
6001 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006002 return thread;
6003}
6004
Linus Torvalds1da177e2005-04-16 15:20:36 -07006005void md_unregister_thread(mdk_thread_t *thread)
6006{
NeilBrowne0cf8f02009-03-31 14:39:39 +11006007 if (!thread)
6008 return;
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -07006009 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
NeilBrowna6fb0932005-09-09 16:23:56 -07006010
6011 kthread_stop(thread->tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006012 kfree(thread);
6013}
6014
6015void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
6016{
6017 if (!mddev) {
6018 MD_BUG();
6019 return;
6020 }
6021
NeilBrownb2d444d2005-11-08 21:39:31 -08006022 if (!rdev || test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006023 return;
Dan Williams6bfe0b42008-04-30 00:52:32 -07006024
6025 if (mddev->external)
6026 set_bit(Blocked, &rdev->flags);
NeilBrown32a76272005-06-21 17:17:14 -07006027/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006028 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6029 mdname(mddev),
6030 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6031 __builtin_return_address(0),__builtin_return_address(1),
6032 __builtin_return_address(2),__builtin_return_address(3));
NeilBrown32a76272005-06-21 17:17:14 -07006033*/
Andrew Mortond0a0a5e2006-07-10 04:44:20 -07006034 if (!mddev->pers)
6035 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006036 if (!mddev->pers->error_handler)
6037 return;
6038 mddev->pers->error_handler(mddev,rdev);
Neil Brown72a23c22008-06-28 08:31:41 +10006039 if (mddev->degraded)
6040 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
NeilBrownc0cc75f2010-03-22 10:28:51 +11006041 sysfs_notify_dirent(rdev->sysfs_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006042 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6043 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6044 md_wakeup_thread(mddev->thread);
NeilBrownc331eb02006-05-30 21:27:13 -07006045 md_new_event_inintr(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006046}
6047
6048/* seq_file implementation /proc/mdstat */
6049
6050static void status_unused(struct seq_file *seq)
6051{
6052 int i = 0;
6053 mdk_rdev_t *rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006054
6055 seq_printf(seq, "unused devices: ");
6056
Cheng Renquan159ec1f2009-01-09 08:31:08 +11006057 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006058 char b[BDEVNAME_SIZE];
6059 i++;
6060 seq_printf(seq, "%s ",
6061 bdevname(rdev->bdev,b));
6062 }
6063 if (!i)
6064 seq_printf(seq, "<none>");
6065
6066 seq_printf(seq, "\n");
6067}
6068
6069
6070static void status_resync(struct seq_file *seq, mddev_t * mddev)
6071{
NeilBrowndd71cf62009-05-07 12:49:35 +10006072 sector_t max_sectors, resync, res;
6073 unsigned long dt, db;
6074 sector_t rt;
NeilBrown4588b422006-03-27 01:18:04 -08006075 int scale;
6076 unsigned int per_milli;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006077
NeilBrowndd71cf62009-05-07 12:49:35 +10006078 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006079
6080 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
NeilBrowndd71cf62009-05-07 12:49:35 +10006081 max_sectors = mddev->resync_max_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006082 else
NeilBrowndd71cf62009-05-07 12:49:35 +10006083 max_sectors = mddev->dev_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006084
6085 /*
6086 * Should not happen.
6087 */
NeilBrowndd71cf62009-05-07 12:49:35 +10006088 if (!max_sectors) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006089 MD_BUG();
6090 return;
6091 }
NeilBrown4588b422006-03-27 01:18:04 -08006092 /* Pick 'scale' such that (resync>>scale)*1000 will fit
NeilBrowndd71cf62009-05-07 12:49:35 +10006093 * in a sector_t, and (max_sectors>>scale) will fit in a
NeilBrown4588b422006-03-27 01:18:04 -08006094 * u32, as those are the requirements for sector_div.
6095 * Thus 'scale' must be at least 10
6096 */
6097 scale = 10;
6098 if (sizeof(sector_t) > sizeof(unsigned long)) {
NeilBrowndd71cf62009-05-07 12:49:35 +10006099 while ( max_sectors/2 > (1ULL<<(scale+32)))
NeilBrown4588b422006-03-27 01:18:04 -08006100 scale++;
6101 }
6102 res = (resync>>scale)*1000;
NeilBrowndd71cf62009-05-07 12:49:35 +10006103 sector_div(res, (u32)((max_sectors>>scale)+1));
NeilBrown4588b422006-03-27 01:18:04 -08006104
6105 per_milli = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006106 {
NeilBrown4588b422006-03-27 01:18:04 -08006107 int i, x = per_milli/50, y = 20-x;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006108 seq_printf(seq, "[");
6109 for (i = 0; i < x; i++)
6110 seq_printf(seq, "=");
6111 seq_printf(seq, ">");
6112 for (i = 0; i < y; i++)
6113 seq_printf(seq, ".");
6114 seq_printf(seq, "] ");
6115 }
NeilBrown4588b422006-03-27 01:18:04 -08006116 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
NeilBrownccfcc3c2006-03-27 01:18:09 -08006117 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
6118 "reshape" :
NeilBrown61df9d92006-10-03 01:15:57 -07006119 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
6120 "check" :
6121 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
6122 "resync" : "recovery"))),
6123 per_milli/10, per_milli % 10,
NeilBrowndd71cf62009-05-07 12:49:35 +10006124 (unsigned long long) resync/2,
6125 (unsigned long long) max_sectors/2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006126
6127 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006128 * dt: time from mark until now
6129 * db: blocks written from mark until now
6130 * rt: remaining time
NeilBrowndd71cf62009-05-07 12:49:35 +10006131 *
6132 * rt is a sector_t, so could be 32bit or 64bit.
6133 * So we divide before multiply in case it is 32bit and close
6134 * to the limit.
6135 * We scale the divisor (db) by 32 to avoid loosing precision
6136 * near the end of resync when the number of remaining sectors
6137 * is close to 'db'.
6138 * We then divide rt by 32 after multiplying by db to compensate.
6139 * The '+1' avoids division by zero if db is very small.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006140 */
6141 dt = ((jiffies - mddev->resync_mark) / HZ);
6142 if (!dt) dt++;
NeilBrownff4e8d92006-07-10 04:44:16 -07006143 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
6144 - mddev->resync_mark_cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006145
NeilBrowndd71cf62009-05-07 12:49:35 +10006146 rt = max_sectors - resync; /* number of remaining sectors */
6147 sector_div(rt, db/32+1);
6148 rt *= dt;
6149 rt >>= 5;
6150
6151 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
6152 ((unsigned long)rt % 60)/6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006153
NeilBrownff4e8d92006-07-10 04:44:16 -07006154 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006155}
6156
6157static void *md_seq_start(struct seq_file *seq, loff_t *pos)
6158{
6159 struct list_head *tmp;
6160 loff_t l = *pos;
6161 mddev_t *mddev;
6162
6163 if (l >= 0x10000)
6164 return NULL;
6165 if (!l--)
6166 /* header */
6167 return (void*)1;
6168
6169 spin_lock(&all_mddevs_lock);
6170 list_for_each(tmp,&all_mddevs)
6171 if (!l--) {
6172 mddev = list_entry(tmp, mddev_t, all_mddevs);
6173 mddev_get(mddev);
6174 spin_unlock(&all_mddevs_lock);
6175 return mddev;
6176 }
6177 spin_unlock(&all_mddevs_lock);
6178 if (!l--)
6179 return (void*)2;/* tail */
6180 return NULL;
6181}
6182
6183static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
6184{
6185 struct list_head *tmp;
6186 mddev_t *next_mddev, *mddev = v;
6187
6188 ++*pos;
6189 if (v == (void*)2)
6190 return NULL;
6191
6192 spin_lock(&all_mddevs_lock);
6193 if (v == (void*)1)
6194 tmp = all_mddevs.next;
6195 else
6196 tmp = mddev->all_mddevs.next;
6197 if (tmp != &all_mddevs)
6198 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
6199 else {
6200 next_mddev = (void*)2;
6201 *pos = 0x10000;
6202 }
6203 spin_unlock(&all_mddevs_lock);
6204
6205 if (v != (void*)1)
6206 mddev_put(mddev);
6207 return next_mddev;
6208
6209}
6210
6211static void md_seq_stop(struct seq_file *seq, void *v)
6212{
6213 mddev_t *mddev = v;
6214
6215 if (mddev && v != (void*)1 && v != (void*)2)
6216 mddev_put(mddev);
6217}
6218
NeilBrownd7603b72006-01-06 00:20:30 -08006219struct mdstat_info {
6220 int event;
6221};
6222
Linus Torvalds1da177e2005-04-16 15:20:36 -07006223static int md_seq_show(struct seq_file *seq, void *v)
6224{
6225 mddev_t *mddev = v;
Andre Nolldd8ac332009-03-31 14:33:13 +11006226 sector_t sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006227 mdk_rdev_t *rdev;
NeilBrownd7603b72006-01-06 00:20:30 -08006228 struct mdstat_info *mi = seq->private;
NeilBrown32a76272005-06-21 17:17:14 -07006229 struct bitmap *bitmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006230
6231 if (v == (void*)1) {
NeilBrown2604b702006-01-06 00:20:36 -08006232 struct mdk_personality *pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006233 seq_printf(seq, "Personalities : ");
6234 spin_lock(&pers_lock);
NeilBrown2604b702006-01-06 00:20:36 -08006235 list_for_each_entry(pers, &pers_list, list)
6236 seq_printf(seq, "[%s] ", pers->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006237
6238 spin_unlock(&pers_lock);
6239 seq_printf(seq, "\n");
NeilBrownd7603b72006-01-06 00:20:30 -08006240 mi->event = atomic_read(&md_event_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006241 return 0;
6242 }
6243 if (v == (void*)2) {
6244 status_unused(seq);
6245 return 0;
6246 }
6247
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07006248 if (mddev_lock(mddev) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006249 return -EINTR;
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07006250
Linus Torvalds1da177e2005-04-16 15:20:36 -07006251 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
6252 seq_printf(seq, "%s : %sactive", mdname(mddev),
6253 mddev->pers ? "" : "in");
6254 if (mddev->pers) {
NeilBrownf91de922005-11-08 21:39:36 -08006255 if (mddev->ro==1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006256 seq_printf(seq, " (read-only)");
NeilBrownf91de922005-11-08 21:39:36 -08006257 if (mddev->ro==2)
NeilBrown52720ae2008-03-10 11:43:47 -07006258 seq_printf(seq, " (auto-read-only)");
Linus Torvalds1da177e2005-04-16 15:20:36 -07006259 seq_printf(seq, " %s", mddev->pers->name);
6260 }
6261
Andre Nolldd8ac332009-03-31 14:33:13 +11006262 sectors = 0;
Cheng Renquan159ec1f2009-01-09 08:31:08 +11006263 list_for_each_entry(rdev, &mddev->disks, same_set) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006264 char b[BDEVNAME_SIZE];
6265 seq_printf(seq, " %s[%d]",
6266 bdevname(rdev->bdev,b), rdev->desc_nr);
NeilBrown8ddf9ef2005-09-09 16:23:45 -07006267 if (test_bit(WriteMostly, &rdev->flags))
6268 seq_printf(seq, "(W)");
NeilBrownb2d444d2005-11-08 21:39:31 -08006269 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006270 seq_printf(seq, "(F)");
6271 continue;
NeilBrownb325a322005-09-09 16:24:00 -07006272 } else if (rdev->raid_disk < 0)
6273 seq_printf(seq, "(S)"); /* spare */
Andre Nolldd8ac332009-03-31 14:33:13 +11006274 sectors += rdev->sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006275 }
6276
6277 if (!list_empty(&mddev->disks)) {
6278 if (mddev->pers)
6279 seq_printf(seq, "\n %llu blocks",
Andre Nollf233ea52008-07-21 17:05:22 +10006280 (unsigned long long)
6281 mddev->array_sectors / 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006282 else
6283 seq_printf(seq, "\n %llu blocks",
Andre Nolldd8ac332009-03-31 14:33:13 +11006284 (unsigned long long)sectors / 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006285 }
NeilBrown1cd6bf12005-09-09 16:24:00 -07006286 if (mddev->persistent) {
6287 if (mddev->major_version != 0 ||
6288 mddev->minor_version != 90) {
6289 seq_printf(seq," super %d.%d",
6290 mddev->major_version,
6291 mddev->minor_version);
6292 }
NeilBrowne6910632008-02-06 01:39:51 -08006293 } else if (mddev->external)
6294 seq_printf(seq, " super external:%s",
6295 mddev->metadata_type);
6296 else
NeilBrown1cd6bf12005-09-09 16:24:00 -07006297 seq_printf(seq, " super non-persistent");
Linus Torvalds1da177e2005-04-16 15:20:36 -07006298
6299 if (mddev->pers) {
NeilBrownd710e132008-10-13 11:55:12 +11006300 mddev->pers->status(seq, mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006301 seq_printf(seq, "\n ");
NeilBrown8e1b39d2005-11-08 21:39:41 -08006302 if (mddev->pers->sync_request) {
6303 if (mddev->curr_resync > 2) {
NeilBrownd710e132008-10-13 11:55:12 +11006304 status_resync(seq, mddev);
NeilBrown8e1b39d2005-11-08 21:39:41 -08006305 seq_printf(seq, "\n ");
6306 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
6307 seq_printf(seq, "\tresync=DELAYED\n ");
6308 else if (mddev->recovery_cp < MaxSector)
6309 seq_printf(seq, "\tresync=PENDING\n ");
6310 }
NeilBrown32a76272005-06-21 17:17:14 -07006311 } else
6312 seq_printf(seq, "\n ");
6313
6314 if ((bitmap = mddev->bitmap)) {
NeilBrown32a76272005-06-21 17:17:14 -07006315 unsigned long chunk_kb;
6316 unsigned long flags;
NeilBrown32a76272005-06-21 17:17:14 -07006317 spin_lock_irqsave(&bitmap->lock, flags);
NeilBrown42a04b52009-12-14 12:49:53 +11006318 chunk_kb = mddev->bitmap_info.chunksize >> 10;
NeilBrown32a76272005-06-21 17:17:14 -07006319 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
6320 "%lu%s chunk",
6321 bitmap->pages - bitmap->missing_pages,
6322 bitmap->pages,
6323 (bitmap->pages - bitmap->missing_pages)
6324 << (PAGE_SHIFT - 10),
NeilBrown42a04b52009-12-14 12:49:53 +11006325 chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
NeilBrown32a76272005-06-21 17:17:14 -07006326 chunk_kb ? "KB" : "B");
NeilBrown78d742d2005-06-21 17:17:15 -07006327 if (bitmap->file) {
6328 seq_printf(seq, ", file: ");
Jan Blunckc32c2f62008-02-14 19:38:43 -08006329 seq_path(seq, &bitmap->file->f_path, " \t\n");
NeilBrown32a76272005-06-21 17:17:14 -07006330 }
NeilBrown78d742d2005-06-21 17:17:15 -07006331
NeilBrown32a76272005-06-21 17:17:14 -07006332 seq_printf(seq, "\n");
6333 spin_unlock_irqrestore(&bitmap->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006334 }
6335
6336 seq_printf(seq, "\n");
6337 }
6338 mddev_unlock(mddev);
6339
6340 return 0;
6341}
6342
Jan Engelhardt110518b2009-05-07 12:49:37 +10006343static const struct seq_operations md_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006344 .start = md_seq_start,
6345 .next = md_seq_next,
6346 .stop = md_seq_stop,
6347 .show = md_seq_show,
6348};
6349
6350static int md_seq_open(struct inode *inode, struct file *file)
6351{
6352 int error;
NeilBrownd7603b72006-01-06 00:20:30 -08006353 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6354 if (mi == NULL)
6355 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006356
6357 error = seq_open(file, &md_seq_ops);
NeilBrownd7603b72006-01-06 00:20:30 -08006358 if (error)
6359 kfree(mi);
6360 else {
6361 struct seq_file *p = file->private_data;
6362 p->private = mi;
6363 mi->event = atomic_read(&md_event_count);
6364 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006365 return error;
6366}
6367
NeilBrownd7603b72006-01-06 00:20:30 -08006368static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6369{
6370 struct seq_file *m = filp->private_data;
6371 struct mdstat_info *mi = m->private;
6372 int mask;
6373
6374 poll_wait(filp, &md_event_waiters, wait);
6375
6376 /* always allow read */
6377 mask = POLLIN | POLLRDNORM;
6378
6379 if (mi->event != atomic_read(&md_event_count))
6380 mask |= POLLERR | POLLPRI;
6381 return mask;
6382}
6383
Arjan van de Venfa027c22007-02-12 00:55:33 -08006384static const struct file_operations md_seq_fops = {
Akinobu Mitae24650c2006-10-17 00:09:38 -07006385 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006386 .open = md_seq_open,
6387 .read = seq_read,
6388 .llseek = seq_lseek,
Martin Peschkec3f94b402007-05-09 02:35:35 -07006389 .release = seq_release_private,
NeilBrownd7603b72006-01-06 00:20:30 -08006390 .poll = mdstat_poll,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006391};
6392
NeilBrown2604b702006-01-06 00:20:36 -08006393int register_md_personality(struct mdk_personality *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006394{
Linus Torvalds1da177e2005-04-16 15:20:36 -07006395 spin_lock(&pers_lock);
NeilBrown2604b702006-01-06 00:20:36 -08006396 list_add_tail(&p->list, &pers_list);
6397 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006398 spin_unlock(&pers_lock);
6399 return 0;
6400}
6401
NeilBrown2604b702006-01-06 00:20:36 -08006402int unregister_md_personality(struct mdk_personality *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006403{
NeilBrown2604b702006-01-06 00:20:36 -08006404 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006405 spin_lock(&pers_lock);
NeilBrown2604b702006-01-06 00:20:36 -08006406 list_del_init(&p->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006407 spin_unlock(&pers_lock);
6408 return 0;
6409}
6410
NeilBrowneea1bf32009-03-31 14:27:02 +11006411static int is_mddev_idle(mddev_t *mddev, int init)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006412{
6413 mdk_rdev_t * rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006414 int idle;
NeilBrowneea1bf32009-03-31 14:27:02 +11006415 int curr_events;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006416
6417 idle = 1;
NeilBrown4b809912008-07-21 17:05:25 +10006418 rcu_read_lock();
6419 rdev_for_each_rcu(rdev, mddev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006420 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
NeilBrowneea1bf32009-03-31 14:27:02 +11006421 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6422 (int)part_stat_read(&disk->part0, sectors[1]) -
6423 atomic_read(&disk->sync_io);
NeilBrown713f6ab2007-07-17 04:06:12 -07006424 /* sync IO will cause sync_io to increase before the disk_stats
6425 * as sync_io is counted when a request starts, and
6426 * disk_stats is counted when it completes.
6427 * So resync activity will cause curr_events to be smaller than
6428 * when there was no such activity.
6429 * non-sync IO will cause disk_stat to increase without
6430 * increasing sync_io so curr_events will (eventually)
6431 * be larger than it was before. Once it becomes
6432 * substantially larger, the test below will cause
6433 * the array to appear non-idle, and resync will slow
6434 * down.
6435 * If there is a lot of outstanding resync activity when
6436 * we set last_event to curr_events, then all that activity
6437 * completing might cause the array to appear non-idle
6438 * and resync will be slowed down even though there might
6439 * not have been non-resync activity. This will only
6440 * happen once though. 'last_events' will soon reflect
6441 * the state where there is little or no outstanding
6442 * resync requests, and further resync activity will
6443 * always make curr_events less than last_events.
NeilBrownc0e48522005-11-18 01:11:01 -08006444 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07006445 */
NeilBrowneea1bf32009-03-31 14:27:02 +11006446 if (init || curr_events - rdev->last_events > 64) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006447 rdev->last_events = curr_events;
6448 idle = 0;
6449 }
6450 }
NeilBrown4b809912008-07-21 17:05:25 +10006451 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006452 return idle;
6453}
6454
6455void md_done_sync(mddev_t *mddev, int blocks, int ok)
6456{
6457 /* another "blocks" (512byte) blocks have been synced */
6458 atomic_sub(blocks, &mddev->recovery_active);
6459 wake_up(&mddev->recovery_wait);
6460 if (!ok) {
NeilBrowndfc70642008-05-23 13:04:39 -07006461 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006462 md_wakeup_thread(mddev->thread);
6463 // stop recovery, signal do_sync ....
6464 }
6465}
6466
6467
NeilBrown06d91a52005-06-21 17:17:12 -07006468/* md_write_start(mddev, bi)
6469 * If we need to update some array metadata (e.g. 'active' flag
NeilBrown3d310eb2005-06-21 17:17:26 -07006470 * in superblock) before writing, schedule a superblock update
6471 * and wait for it to complete.
NeilBrown06d91a52005-06-21 17:17:12 -07006472 */
NeilBrown3d310eb2005-06-21 17:17:26 -07006473void md_write_start(mddev_t *mddev, struct bio *bi)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006474{
Neil Brown0fd62b82008-06-28 08:31:36 +10006475 int did_change = 0;
NeilBrown06d91a52005-06-21 17:17:12 -07006476 if (bio_data_dir(bi) != WRITE)
NeilBrown3d310eb2005-06-21 17:17:26 -07006477 return;
NeilBrown06d91a52005-06-21 17:17:12 -07006478
NeilBrownf91de922005-11-08 21:39:36 -08006479 BUG_ON(mddev->ro == 1);
6480 if (mddev->ro == 2) {
6481 /* need to switch to read/write */
6482 mddev->ro = 0;
6483 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6484 md_wakeup_thread(mddev->thread);
NeilBrown25156192008-03-04 14:29:32 -08006485 md_wakeup_thread(mddev->sync_thread);
Neil Brown0fd62b82008-06-28 08:31:36 +10006486 did_change = 1;
NeilBrownf91de922005-11-08 21:39:36 -08006487 }
NeilBrown06d91a52005-06-21 17:17:12 -07006488 atomic_inc(&mddev->writes_pending);
NeilBrown31a59e32008-04-30 00:52:30 -07006489 if (mddev->safemode == 1)
6490 mddev->safemode = 0;
NeilBrown06d91a52005-06-21 17:17:12 -07006491 if (mddev->in_sync) {
NeilBrowna9701a32005-11-08 21:39:34 -08006492 spin_lock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07006493 if (mddev->in_sync) {
6494 mddev->in_sync = 0;
NeilBrown850b2b42006-10-03 01:15:46 -07006495 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
NeilBrown3d310eb2005-06-21 17:17:26 -07006496 md_wakeup_thread(mddev->thread);
Neil Brown0fd62b82008-06-28 08:31:36 +10006497 did_change = 1;
NeilBrown3d310eb2005-06-21 17:17:26 -07006498 }
NeilBrowna9701a32005-11-08 21:39:34 -08006499 spin_unlock_irq(&mddev->write_lock);
NeilBrown06d91a52005-06-21 17:17:12 -07006500 }
Neil Brown0fd62b82008-06-28 08:31:36 +10006501 if (did_change)
NeilBrownb62b7592008-10-21 13:25:21 +11006502 sysfs_notify_dirent(mddev->sysfs_state);
NeilBrown09a44cc2008-05-23 13:04:36 -07006503 wait_event(mddev->sb_wait,
6504 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6505 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
Linus Torvalds1da177e2005-04-16 15:20:36 -07006506}
6507
6508void md_write_end(mddev_t *mddev)
6509{
6510 if (atomic_dec_and_test(&mddev->writes_pending)) {
6511 if (mddev->safemode == 2)
6512 md_wakeup_thread(mddev->thread);
NeilBrown16f17b32006-06-26 00:27:37 -07006513 else if (mddev->safemode_delay)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006514 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6515 }
6516}
6517
NeilBrown2a2275d2007-01-26 00:57:11 -08006518/* md_allow_write(mddev)
6519 * Calling this ensures that the array is marked 'active' so that writes
6520 * may proceed without blocking. It is important to call this before
6521 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6522 * Must be called with mddev_lock held.
Dan Williamsb5470dc2008-06-27 21:44:04 -07006523 *
6524 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6525 * is dropped, so return -EAGAIN after notifying userspace.
NeilBrown2a2275d2007-01-26 00:57:11 -08006526 */
Dan Williamsb5470dc2008-06-27 21:44:04 -07006527int md_allow_write(mddev_t *mddev)
NeilBrown2a2275d2007-01-26 00:57:11 -08006528{
6529 if (!mddev->pers)
Dan Williamsb5470dc2008-06-27 21:44:04 -07006530 return 0;
NeilBrown2a2275d2007-01-26 00:57:11 -08006531 if (mddev->ro)
Dan Williamsb5470dc2008-06-27 21:44:04 -07006532 return 0;
Neil Brown1a0fd492008-06-28 08:31:27 +10006533 if (!mddev->pers->sync_request)
Dan Williamsb5470dc2008-06-27 21:44:04 -07006534 return 0;
NeilBrown2a2275d2007-01-26 00:57:11 -08006535
6536 spin_lock_irq(&mddev->write_lock);
6537 if (mddev->in_sync) {
6538 mddev->in_sync = 0;
6539 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6540 if (mddev->safemode_delay &&
6541 mddev->safemode == 0)
6542 mddev->safemode = 1;
6543 spin_unlock_irq(&mddev->write_lock);
6544 md_update_sb(mddev, 0);
NeilBrownb62b7592008-10-21 13:25:21 +11006545 sysfs_notify_dirent(mddev->sysfs_state);
NeilBrown2a2275d2007-01-26 00:57:11 -08006546 } else
6547 spin_unlock_irq(&mddev->write_lock);
Dan Williamsb5470dc2008-06-27 21:44:04 -07006548
6549 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6550 return -EAGAIN;
6551 else
6552 return 0;
NeilBrown2a2275d2007-01-26 00:57:11 -08006553}
6554EXPORT_SYMBOL_GPL(md_allow_write);
6555
Linus Torvalds1da177e2005-04-16 15:20:36 -07006556#define SYNC_MARKS 10
6557#define SYNC_MARK_STEP (3*HZ)
NeilBrown29269552006-03-27 01:18:10 -08006558void md_do_sync(mddev_t *mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006559{
6560 mddev_t *mddev2;
6561 unsigned int currspeed = 0,
6562 window;
NeilBrown57afd892005-06-21 17:17:13 -07006563 sector_t max_sectors,j, io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006564 unsigned long mark[SYNC_MARKS];
6565 sector_t mark_cnt[SYNC_MARKS];
6566 int last_mark,m;
6567 struct list_head *tmp;
6568 sector_t last_check;
NeilBrown57afd892005-06-21 17:17:13 -07006569 int skipped = 0;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006570 mdk_rdev_t *rdev;
NeilBrown61df9d92006-10-03 01:15:57 -07006571 char *desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006572
6573 /* just incase thread restarts... */
6574 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6575 return;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006576 if (mddev->ro) /* never try to sync a read-only array */
6577 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006578
NeilBrown61df9d92006-10-03 01:15:57 -07006579 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6580 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6581 desc = "data-check";
6582 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6583 desc = "requested-resync";
6584 else
6585 desc = "resync";
6586 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6587 desc = "reshape";
6588 else
6589 desc = "recovery";
6590
Linus Torvalds1da177e2005-04-16 15:20:36 -07006591 /* we overload curr_resync somewhat here.
6592 * 0 == not engaged in resync at all
6593 * 2 == checking that there is no conflict with another sync
6594 * 1 == like 2, but have yielded to allow conflicting resync to
6595 * commense
6596 * other == active in resync - this many blocks
6597 *
6598 * Before starting a resync we must have set curr_resync to
6599 * 2, and then checked that every "conflicting" array has curr_resync
6600 * less than ours. When we find one that is the same or higher
6601 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6602 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6603 * This will mean we have to start checking from the beginning again.
6604 *
6605 */
6606
6607 do {
6608 mddev->curr_resync = 2;
6609
6610 try_again:
NeilBrown404e4b42009-12-30 15:25:23 +11006611 if (kthread_should_stop())
NeilBrown6985c432005-10-19 21:23:47 -07006612 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
NeilBrown404e4b42009-12-30 15:25:23 +11006613
6614 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006615 goto skip;
NeilBrown29ac4aa2008-02-06 01:39:58 -08006616 for_each_mddev(mddev2, tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006617 if (mddev2 == mddev)
6618 continue;
Bernd Schubert90b08712008-05-23 13:04:38 -07006619 if (!mddev->parallel_resync
6620 && mddev2->curr_resync
6621 && match_mddev_units(mddev, mddev2)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006622 DEFINE_WAIT(wq);
6623 if (mddev < mddev2 && mddev->curr_resync == 2) {
6624 /* arbitrarily yield */
6625 mddev->curr_resync = 1;
6626 wake_up(&resync_wait);
6627 }
6628 if (mddev > mddev2 && mddev->curr_resync == 1)
6629 /* no need to wait here, we can wait the next
6630 * time 'round when curr_resync == 2
6631 */
6632 continue;
NeilBrown97441972008-09-19 11:49:54 +10006633 /* We need to wait 'interruptible' so as not to
6634 * contribute to the load average, and not to
6635 * be caught by 'softlockup'
6636 */
6637 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
NeilBrown787453c2005-11-08 21:39:43 -08006638 if (!kthread_should_stop() &&
NeilBrown8712e552005-10-26 01:58:58 -07006639 mddev2->curr_resync >= mddev->curr_resync) {
NeilBrown61df9d92006-10-03 01:15:57 -07006640 printk(KERN_INFO "md: delaying %s of %s"
6641 " until %s has finished (they"
Linus Torvalds1da177e2005-04-16 15:20:36 -07006642 " share one or more physical units)\n",
NeilBrown61df9d92006-10-03 01:15:57 -07006643 desc, mdname(mddev), mdname(mddev2));
Linus Torvalds1da177e2005-04-16 15:20:36 -07006644 mddev_put(mddev2);
NeilBrown97441972008-09-19 11:49:54 +10006645 if (signal_pending(current))
6646 flush_signals(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006647 schedule();
6648 finish_wait(&resync_wait, &wq);
6649 goto try_again;
6650 }
6651 finish_wait(&resync_wait, &wq);
6652 }
6653 }
6654 } while (mddev->curr_resync < 2);
6655
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006656 j = 0;
NeilBrown9d888832005-11-08 21:39:26 -08006657 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006658 /* resync follows the size requested by the personality,
NeilBrown57afd892005-06-21 17:17:13 -07006659 * which defaults to physical size, but can be virtual size
Linus Torvalds1da177e2005-04-16 15:20:36 -07006660 */
6661 max_sectors = mddev->resync_max_sectors;
NeilBrown9d888832005-11-08 21:39:26 -08006662 mddev->resync_mismatches = 0;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006663 /* we don't use the checkpoint if there's a bitmap */
Neil Brown5e96ee62008-06-28 08:31:24 +10006664 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6665 j = mddev->resync_min;
6666 else if (!mddev->bitmap)
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006667 j = mddev->recovery_cp;
Neil Brown5e96ee62008-06-28 08:31:24 +10006668
NeilBrownccfcc3c2006-03-27 01:18:09 -08006669 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
Andre Noll58c0fed2009-03-31 14:33:13 +11006670 max_sectors = mddev->dev_sectors;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006671 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006672 /* recovery follows the physical size of devices */
Andre Noll58c0fed2009-03-31 14:33:13 +11006673 max_sectors = mddev->dev_sectors;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006674 j = MaxSector;
Dan Williams4e59ca72009-12-12 21:17:06 -07006675 rcu_read_lock();
6676 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006677 if (rdev->raid_disk >= 0 &&
6678 !test_bit(Faulty, &rdev->flags) &&
6679 !test_bit(In_sync, &rdev->flags) &&
6680 rdev->recovery_offset < j)
6681 j = rdev->recovery_offset;
Dan Williams4e59ca72009-12-12 21:17:06 -07006682 rcu_read_unlock();
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006683 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006684
NeilBrown61df9d92006-10-03 01:15:57 -07006685 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6686 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
6687 " %d KB/sec/disk.\n", speed_min(mddev));
Adrian Bunk338cec32005-09-10 00:26:54 -07006688 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
NeilBrown61df9d92006-10-03 01:15:57 -07006689 "(but not more than %d KB/sec) for %s.\n",
6690 speed_max(mddev), desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006691
NeilBrowneea1bf32009-03-31 14:27:02 +11006692 is_mddev_idle(mddev, 1); /* this initializes IO event counters */
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006693
NeilBrown57afd892005-06-21 17:17:13 -07006694 io_sectors = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006695 for (m = 0; m < SYNC_MARKS; m++) {
6696 mark[m] = jiffies;
NeilBrown57afd892005-06-21 17:17:13 -07006697 mark_cnt[m] = io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006698 }
6699 last_mark = 0;
6700 mddev->resync_mark = mark[last_mark];
6701 mddev->resync_mark_cnt = mark_cnt[last_mark];
6702
6703 /*
6704 * Tune reconstruction:
6705 */
6706 window = 32*(PAGE_SIZE/512);
6707 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6708 window/2,(unsigned long long) max_sectors/2);
6709
6710 atomic_set(&mddev->recovery_active, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006711 last_check = 0;
6712
6713 if (j>2) {
6714 printk(KERN_INFO
NeilBrown61df9d92006-10-03 01:15:57 -07006715 "md: resuming %s of %s from checkpoint.\n",
6716 desc, mdname(mddev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07006717 mddev->curr_resync = j;
6718 }
NeilBrownefa59332009-12-14 12:49:49 +11006719 mddev->curr_resync_completed = mddev->curr_resync;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006720
6721 while (j < max_sectors) {
NeilBrown57afd892005-06-21 17:17:13 -07006722 sector_t sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006723
NeilBrown57afd892005-06-21 17:17:13 -07006724 skipped = 0;
NeilBrown97e4f422009-03-31 14:33:13 +11006725
NeilBrown7a91ee12009-05-26 12:57:21 +10006726 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6727 ((mddev->curr_resync > mddev->curr_resync_completed &&
6728 (mddev->curr_resync - mddev->curr_resync_completed)
6729 > (max_sectors >> 4)) ||
6730 (j - mddev->curr_resync_completed)*2
6731 >= mddev->resync_max - mddev->curr_resync_completed
6732 )) {
NeilBrown97e4f422009-03-31 14:33:13 +11006733 /* time to update curr_resync_completed */
6734 blk_unplug(mddev->queue);
6735 wait_event(mddev->recovery_wait,
6736 atomic_read(&mddev->recovery_active) == 0);
6737 mddev->curr_resync_completed =
6738 mddev->curr_resync;
6739 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
NeilBrownacb180b2009-04-14 16:28:34 +10006740 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
NeilBrown97e4f422009-03-31 14:33:13 +11006741 }
NeilBrownacb180b2009-04-14 16:28:34 +10006742
NeilBrowne62e58a2009-07-01 13:15:35 +10006743 while (j >= mddev->resync_max && !kthread_should_stop()) {
6744 /* As this condition is controlled by user-space,
6745 * we can block indefinitely, so use '_interruptible'
6746 * to avoid triggering warnings.
6747 */
6748 flush_signals(current); /* just in case */
6749 wait_event_interruptible(mddev->recovery_wait,
6750 mddev->resync_max > j
6751 || kthread_should_stop());
6752 }
NeilBrownacb180b2009-04-14 16:28:34 +10006753
6754 if (kthread_should_stop())
6755 goto interrupted;
6756
NeilBrown57afd892005-06-21 17:17:13 -07006757 sectors = mddev->pers->sync_request(mddev, j, &skipped,
NeilBrownc6207272008-02-06 01:39:52 -08006758 currspeed < speed_min(mddev));
NeilBrown57afd892005-06-21 17:17:13 -07006759 if (sectors == 0) {
NeilBrowndfc70642008-05-23 13:04:39 -07006760 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006761 goto out;
6762 }
NeilBrown57afd892005-06-21 17:17:13 -07006763
6764 if (!skipped) { /* actual IO requested */
6765 io_sectors += sectors;
6766 atomic_add(sectors, &mddev->recovery_active);
6767 }
6768
Linus Torvalds1da177e2005-04-16 15:20:36 -07006769 j += sectors;
6770 if (j>1) mddev->curr_resync = j;
NeilBrownff4e8d92006-07-10 04:44:16 -07006771 mddev->curr_mark_cnt = io_sectors;
NeilBrownd7603b72006-01-06 00:20:30 -08006772 if (last_check == 0)
6773 /* this is the earliers that rebuilt will be
6774 * visible in /proc/mdstat
6775 */
6776 md_new_event(mddev);
NeilBrown57afd892005-06-21 17:17:13 -07006777
6778 if (last_check + window > io_sectors || j == max_sectors)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006779 continue;
6780
NeilBrown57afd892005-06-21 17:17:13 -07006781 last_check = io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006782
NeilBrowndfc70642008-05-23 13:04:39 -07006783 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006784 break;
6785
6786 repeat:
6787 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6788 /* step marks */
6789 int next = (last_mark+1) % SYNC_MARKS;
6790
6791 mddev->resync_mark = mark[next];
6792 mddev->resync_mark_cnt = mark_cnt[next];
6793 mark[next] = jiffies;
NeilBrown57afd892005-06-21 17:17:13 -07006794 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006795 last_mark = next;
6796 }
6797
6798
NeilBrownc6207272008-02-06 01:39:52 -08006799 if (kthread_should_stop())
6800 goto interrupted;
6801
Linus Torvalds1da177e2005-04-16 15:20:36 -07006802
6803 /*
6804 * this loop exits only if either when we are slower than
6805 * the 'hard' speed limit, or the system was IO-idle for
6806 * a jiffy.
6807 * the system might be non-idle CPU-wise, but we only care
6808 * about not overloading the IO subsystem. (things like an
6809 * e2fsck being done on the RAID array should execute fast)
6810 */
Alan D. Brunelle2ad8b1e2007-11-07 14:26:56 -05006811 blk_unplug(mddev->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006812 cond_resched();
6813
NeilBrown57afd892005-06-21 17:17:13 -07006814 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6815 /((jiffies-mddev->resync_mark)/HZ +1) +1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006816
NeilBrown88202a02006-01-06 00:21:36 -08006817 if (currspeed > speed_min(mddev)) {
6818 if ((currspeed > speed_max(mddev)) ||
NeilBrowneea1bf32009-03-31 14:27:02 +11006819 !is_mddev_idle(mddev, 0)) {
NeilBrownc0e48522005-11-18 01:11:01 -08006820 msleep(500);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006821 goto repeat;
6822 }
6823 }
6824 }
NeilBrown61df9d92006-10-03 01:15:57 -07006825 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006826 /*
6827 * this also signals 'finished resyncing' to md_stop
6828 */
6829 out:
Alan D. Brunelle2ad8b1e2007-11-07 14:26:56 -05006830 blk_unplug(mddev->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006831
6832 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6833
6834 /* tell personality that we are finished */
NeilBrown57afd892005-06-21 17:17:13 -07006835 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006836
NeilBrowndfc70642008-05-23 13:04:39 -07006837 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006838 mddev->curr_resync > 2) {
6839 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6840 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6841 if (mddev->curr_resync >= mddev->recovery_cp) {
6842 printk(KERN_INFO
NeilBrown61df9d92006-10-03 01:15:57 -07006843 "md: checkpointing %s of %s.\n",
6844 desc, mdname(mddev));
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006845 mddev->recovery_cp = mddev->curr_resync;
6846 }
6847 } else
6848 mddev->recovery_cp = MaxSector;
6849 } else {
6850 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6851 mddev->curr_resync = MaxSector;
Dan Williams4e59ca72009-12-12 21:17:06 -07006852 rcu_read_lock();
6853 list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006854 if (rdev->raid_disk >= 0 &&
6855 !test_bit(Faulty, &rdev->flags) &&
6856 !test_bit(In_sync, &rdev->flags) &&
6857 rdev->recovery_offset < mddev->curr_resync)
6858 rdev->recovery_offset = mddev->curr_resync;
Dan Williams4e59ca72009-12-12 21:17:06 -07006859 rcu_read_unlock();
NeilBrown5fd6c1d2006-06-26 00:27:40 -07006860 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006861 }
NeilBrown17571282006-12-10 02:20:52 -08006862 set_bit(MD_CHANGE_DEVS, &mddev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006863
Linus Torvalds1da177e2005-04-16 15:20:36 -07006864 skip:
NeilBrownc07b70a2009-12-14 12:49:48 +11006865 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6866 /* We completed so min/max setting can be forgotten if used. */
6867 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6868 mddev->resync_min = 0;
6869 mddev->resync_max = MaxSector;
6870 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6871 mddev->resync_min = mddev->curr_resync_completed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006872 mddev->curr_resync = 0;
NeilBrownefa59332009-12-14 12:49:49 +11006873 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6874 mddev->curr_resync_completed = 0;
NeilBrownc6207272008-02-06 01:39:52 -08006875 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
Linus Torvalds1da177e2005-04-16 15:20:36 -07006876 wake_up(&resync_wait);
6877 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6878 md_wakeup_thread(mddev->thread);
NeilBrownc6207272008-02-06 01:39:52 -08006879 return;
6880
6881 interrupted:
6882 /*
6883 * got a signal, exit.
6884 */
6885 printk(KERN_INFO
6886 "md: md_do_sync() got signal ... exiting\n");
6887 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6888 goto out;
6889
Linus Torvalds1da177e2005-04-16 15:20:36 -07006890}
NeilBrown29269552006-03-27 01:18:10 -08006891EXPORT_SYMBOL_GPL(md_do_sync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006892
6893
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006894static int remove_and_add_spares(mddev_t *mddev)
6895{
6896 mdk_rdev_t *rdev;
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006897 int spares = 0;
6898
NeilBrown97e4f422009-03-31 14:33:13 +11006899 mddev->curr_resync_completed = 0;
6900
Cheng Renquan159ec1f2009-01-09 08:31:08 +11006901 list_for_each_entry(rdev, &mddev->disks, same_set)
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006902 if (rdev->raid_disk >= 0 &&
Dan Williams6bfe0b42008-04-30 00:52:32 -07006903 !test_bit(Blocked, &rdev->flags) &&
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006904 (test_bit(Faulty, &rdev->flags) ||
6905 ! test_bit(In_sync, &rdev->flags)) &&
6906 atomic_read(&rdev->nr_pending)==0) {
6907 if (mddev->pers->hot_remove_disk(
6908 mddev, rdev->raid_disk)==0) {
6909 char nm[20];
6910 sprintf(nm,"rd%d", rdev->raid_disk);
6911 sysfs_remove_link(&mddev->kobj, nm);
6912 rdev->raid_disk = -1;
6913 }
6914 }
6915
NeilBrown4044ba52009-01-09 08:31:11 +11006916 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
Cheng Renquan159ec1f2009-01-09 08:31:08 +11006917 list_for_each_entry(rdev, &mddev->disks, same_set) {
NeilBrowndfc70642008-05-23 13:04:39 -07006918 if (rdev->raid_disk >= 0 &&
Dan Williamse5427132008-07-28 23:28:06 -07006919 !test_bit(In_sync, &rdev->flags) &&
6920 !test_bit(Blocked, &rdev->flags))
NeilBrowndfc70642008-05-23 13:04:39 -07006921 spares++;
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006922 if (rdev->raid_disk < 0
6923 && !test_bit(Faulty, &rdev->flags)) {
6924 rdev->recovery_offset = 0;
Neil Brown199050e2008-06-28 08:31:33 +10006925 if (mddev->pers->
6926 hot_add_disk(mddev, rdev) == 0) {
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006927 char nm[20];
6928 sprintf(nm, "rd%d", rdev->raid_disk);
NeilBrown5e55e2f2007-03-26 21:32:14 -08006929 if (sysfs_create_link(&mddev->kobj,
6930 &rdev->kobj, nm))
6931 printk(KERN_WARNING
6932 "md: cannot register "
6933 "%s for %s\n",
6934 nm, mdname(mddev));
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006935 spares++;
6936 md_new_event(mddev);
NeilBrown93be75f2009-12-14 12:50:06 +11006937 set_bit(MD_CHANGE_DEVS, &mddev->flags);
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006938 } else
6939 break;
6940 }
NeilBrowndfc70642008-05-23 13:04:39 -07006941 }
NeilBrownb4c4c7b2007-02-28 20:11:48 -08006942 }
6943 return spares;
6944}
Linus Torvalds1da177e2005-04-16 15:20:36 -07006945/*
6946 * This routine is regularly called by all per-raid-array threads to
6947 * deal with generic issues like resync and super-block update.
6948 * Raid personalities that don't have a thread (linear/raid0) do not
6949 * need this as they never do any recovery or update the superblock.
6950 *
6951 * It does not do any resync itself, but rather "forks" off other threads
6952 * to do that as needed.
6953 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6954 * "->recovery" and create a thread at ->sync_thread.
NeilBrowndfc70642008-05-23 13:04:39 -07006955 * When the thread finishes it sets MD_RECOVERY_DONE
Linus Torvalds1da177e2005-04-16 15:20:36 -07006956 * and wakeups up this thread which will reap the thread and finish up.
6957 * This thread also removes any faulty devices (with nr_pending == 0).
6958 *
6959 * The overall approach is:
6960 * 1/ if the superblock needs updating, update it.
6961 * 2/ If a recovery thread is running, don't do anything else.
6962 * 3/ If recovery has finished, clean up, possibly marking spares active.
6963 * 4/ If there are any faulty devices, remove them.
6964 * 5/ If array is degraded, try to add spares devices
6965 * 6/ If array has spares or is not in-sync, start a resync thread.
6966 */
6967void md_check_recovery(mddev_t *mddev)
6968{
6969 mdk_rdev_t *rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006970
6971
NeilBrown5f404022005-06-21 17:17:16 -07006972 if (mddev->bitmap)
NeilBrownaa5cbd12009-12-14 12:49:46 +11006973 bitmap_daemon_work(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006974
6975 if (mddev->ro)
6976 return;
NeilBrownfca4d842005-06-21 17:17:11 -07006977
6978 if (signal_pending(current)) {
NeilBrown31a59e32008-04-30 00:52:30 -07006979 if (mddev->pers->sync_request && !mddev->external) {
NeilBrownfca4d842005-06-21 17:17:11 -07006980 printk(KERN_INFO "md: %s in immediate safe mode\n",
6981 mdname(mddev));
6982 mddev->safemode = 2;
6983 }
6984 flush_signals(current);
6985 }
6986
NeilBrownc89a8ee2008-08-05 15:54:13 +10006987 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6988 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006989 if ( ! (
NeilBrowne6910632008-02-06 01:39:51 -08006990 (mddev->flags && !mddev->external) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07006991 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
NeilBrownfca4d842005-06-21 17:17:11 -07006992 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
NeilBrown31a59e32008-04-30 00:52:30 -07006993 (mddev->external == 0 && mddev->safemode == 1) ||
NeilBrownfca4d842005-06-21 17:17:11 -07006994 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6995 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006996 ))
6997 return;
NeilBrownfca4d842005-06-21 17:17:11 -07006998
NeilBrowndf5b89b2006-03-27 01:18:20 -08006999 if (mddev_trylock(mddev)) {
NeilBrownb4c4c7b2007-02-28 20:11:48 -08007000 int spares = 0;
NeilBrownfca4d842005-06-21 17:17:11 -07007001
NeilBrownc89a8ee2008-08-05 15:54:13 +10007002 if (mddev->ro) {
7003 /* Only thing we do on a ro array is remove
7004 * failed devices.
7005 */
7006 remove_and_add_spares(mddev);
7007 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7008 goto unlock;
7009 }
7010
NeilBrown31a59e32008-04-30 00:52:30 -07007011 if (!mddev->external) {
Neil Brown0fd62b82008-06-28 08:31:36 +10007012 int did_change = 0;
NeilBrown31a59e32008-04-30 00:52:30 -07007013 spin_lock_irq(&mddev->write_lock);
7014 if (mddev->safemode &&
7015 !atomic_read(&mddev->writes_pending) &&
7016 !mddev->in_sync &&
7017 mddev->recovery_cp == MaxSector) {
7018 mddev->in_sync = 1;
Neil Brown0fd62b82008-06-28 08:31:36 +10007019 did_change = 1;
NeilBrown31a59e32008-04-30 00:52:30 -07007020 if (mddev->persistent)
7021 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
7022 }
7023 if (mddev->safemode == 1)
7024 mddev->safemode = 0;
7025 spin_unlock_irq(&mddev->write_lock);
Neil Brown0fd62b82008-06-28 08:31:36 +10007026 if (did_change)
NeilBrownb62b7592008-10-21 13:25:21 +11007027 sysfs_notify_dirent(mddev->sysfs_state);
NeilBrownfca4d842005-06-21 17:17:11 -07007028 }
NeilBrownfca4d842005-06-21 17:17:11 -07007029
NeilBrown850b2b42006-10-03 01:15:46 -07007030 if (mddev->flags)
7031 md_update_sb(mddev, 0);
NeilBrown06d91a52005-06-21 17:17:12 -07007032
Linus Torvalds1da177e2005-04-16 15:20:36 -07007033 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
7034 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
7035 /* resync/recovery still happening */
7036 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
7037 goto unlock;
7038 }
7039 if (mddev->sync_thread) {
7040 /* resync has finished, collect result */
7041 md_unregister_thread(mddev->sync_thread);
7042 mddev->sync_thread = NULL;
Dan Williams56ac36d2008-08-07 10:02:47 -07007043 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
7044 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007045 /* success...*/
7046 /* activate any spares */
Neil Browna99ac972008-06-28 08:31:43 +10007047 if (mddev->pers->spare_active(mddev))
7048 sysfs_notify(&mddev->kobj, NULL,
7049 "degraded");
Linus Torvalds1da177e2005-04-16 15:20:36 -07007050 }
NeilBrowncea9c222009-03-31 15:15:05 +11007051 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
7052 mddev->pers->finish_reshape)
7053 mddev->pers->finish_reshape(mddev);
NeilBrown850b2b42006-10-03 01:15:46 -07007054 md_update_sb(mddev, 1);
NeilBrown41158c72005-06-21 17:17:25 -07007055
7056 /* if array is no-longer degraded, then any saved_raid_disk
7057 * information must be scrapped
7058 */
7059 if (!mddev->degraded)
Cheng Renquan159ec1f2009-01-09 08:31:08 +11007060 list_for_each_entry(rdev, &mddev->disks, same_set)
NeilBrown41158c72005-06-21 17:17:25 -07007061 rdev->saved_raid_disk = -1;
7062
Linus Torvalds1da177e2005-04-16 15:20:36 -07007063 mddev->recovery = 0;
7064 /* flag recovery needed just to double check */
7065 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown0c3573f2009-01-09 08:31:05 +11007066 sysfs_notify_dirent(mddev->sysfs_action);
NeilBrownd7603b72006-01-06 00:20:30 -08007067 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007068 goto unlock;
7069 }
Neil Brown72a23c22008-06-28 08:31:41 +10007070 /* Set RUNNING before clearing NEEDED to avoid
7071 * any transients in the value of "sync_action".
7072 */
7073 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7074 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown24dd4692005-11-08 21:39:26 -08007075 /* Clear some bits that don't mean anything, but
7076 * might be left set
7077 */
NeilBrown24dd4692005-11-08 21:39:26 -08007078 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
7079 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007080
NeilBrown5fd6c1d2006-06-26 00:27:40 -07007081 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
7082 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007083 /* no recovery is running.
7084 * remove any failed drives, then
7085 * add spares if possible.
7086 * Spare are also removed and re-added, to allow
7087 * the personality to fail the re-add.
7088 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07007089
NeilBrownb4c4c7b2007-02-28 20:11:48 -08007090 if (mddev->reshape_position != MaxSector) {
NeilBrown50ac1682009-06-18 08:47:55 +10007091 if (mddev->pers->check_reshape == NULL ||
7092 mddev->pers->check_reshape(mddev) != 0)
NeilBrownb4c4c7b2007-02-28 20:11:48 -08007093 /* Cannot proceed */
7094 goto unlock;
7095 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
Neil Brown72a23c22008-06-28 08:31:41 +10007096 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
NeilBrownb4c4c7b2007-02-28 20:11:48 -08007097 } else if ((spares = remove_and_add_spares(mddev))) {
NeilBrown24dd4692005-11-08 21:39:26 -08007098 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
7099 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
Dan Williams56ac36d2008-08-07 10:02:47 -07007100 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
Neil Brown72a23c22008-06-28 08:31:41 +10007101 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
NeilBrown24dd4692005-11-08 21:39:26 -08007102 } else if (mddev->recovery_cp < MaxSector) {
7103 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
Neil Brown72a23c22008-06-28 08:31:41 +10007104 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
NeilBrown24dd4692005-11-08 21:39:26 -08007105 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
7106 /* nothing to be done ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -07007107 goto unlock;
NeilBrown24dd4692005-11-08 21:39:26 -08007108
Linus Torvalds1da177e2005-04-16 15:20:36 -07007109 if (mddev->pers->sync_request) {
NeilBrowna654b9d82005-06-21 17:17:27 -07007110 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
7111 /* We are adding a device or devices to an array
7112 * which has the bitmap stored on all devices.
7113 * So make sure all bitmap pages get written
7114 */
7115 bitmap_write_all(mddev->bitmap);
7116 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07007117 mddev->sync_thread = md_register_thread(md_do_sync,
7118 mddev,
NeilBrown0da3c612009-09-23 18:09:45 +10007119 "resync");
Linus Torvalds1da177e2005-04-16 15:20:36 -07007120 if (!mddev->sync_thread) {
7121 printk(KERN_ERR "%s: could not start resync"
7122 " thread...\n",
7123 mdname(mddev));
7124 /* leave the spares where they are, it shouldn't hurt */
7125 mddev->recovery = 0;
NeilBrownd7603b72006-01-06 00:20:30 -08007126 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07007127 md_wakeup_thread(mddev->sync_thread);
NeilBrown0c3573f2009-01-09 08:31:05 +11007128 sysfs_notify_dirent(mddev->sysfs_action);
NeilBrownd7603b72006-01-06 00:20:30 -08007129 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007130 }
7131 unlock:
Neil Brown72a23c22008-06-28 08:31:41 +10007132 if (!mddev->sync_thread) {
7133 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
7134 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
7135 &mddev->recovery))
NeilBrown0c3573f2009-01-09 08:31:05 +11007136 if (mddev->sysfs_action)
7137 sysfs_notify_dirent(mddev->sysfs_action);
Neil Brown72a23c22008-06-28 08:31:41 +10007138 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07007139 mddev_unlock(mddev);
7140 }
7141}
7142
Dan Williams6bfe0b42008-04-30 00:52:32 -07007143void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
7144{
NeilBrown3c0ee632008-10-21 13:25:28 +11007145 sysfs_notify_dirent(rdev->sysfs_state);
Dan Williams6bfe0b42008-04-30 00:52:32 -07007146 wait_event_timeout(rdev->blocked_wait,
7147 !test_bit(Blocked, &rdev->flags),
7148 msecs_to_jiffies(5000));
7149 rdev_dec_pending(rdev, mddev);
7150}
7151EXPORT_SYMBOL(md_wait_for_blocked_rdev);
7152
Adrian Bunk75c96f82005-05-05 16:16:09 -07007153static int md_notify_reboot(struct notifier_block *this,
7154 unsigned long code, void *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007155{
7156 struct list_head *tmp;
7157 mddev_t *mddev;
7158
7159 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
7160
7161 printk(KERN_INFO "md: stopping all md devices.\n");
7162
NeilBrown29ac4aa2008-02-06 01:39:58 -08007163 for_each_mddev(mddev, tmp)
Neil Brownc71d4882006-05-26 10:39:25 +10007164 if (mddev_trylock(mddev)) {
NeilBrown2b250002008-08-05 15:54:13 +10007165 /* Force a switch to readonly even array
7166 * appears to still be in use. Hence
7167 * the '100'.
7168 */
NeilBrowna4bd82d2010-03-29 13:23:10 +11007169 md_set_readonly(mddev, 100);
Neil Brownc71d4882006-05-26 10:39:25 +10007170 mddev_unlock(mddev);
7171 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07007172 /*
7173 * certain more exotic SCSI devices are known to be
7174 * volatile wrt too early system reboots. While the
7175 * right place to handle this issue is the given
7176 * driver, we do want to have a safe RAID driver ...
7177 */
7178 mdelay(1000*1);
7179 }
7180 return NOTIFY_DONE;
7181}
7182
Adrian Bunk75c96f82005-05-05 16:16:09 -07007183static struct notifier_block md_notifier = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007184 .notifier_call = md_notify_reboot,
7185 .next = NULL,
7186 .priority = INT_MAX, /* before any real devices */
7187};
7188
7189static void md_geninit(void)
7190{
Linus Torvalds1da177e2005-04-16 15:20:36 -07007191 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
7192
Denis V. Lunevc7705f3442008-04-29 01:02:35 -07007193 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007194}
7195
Adrian Bunk75c96f82005-05-05 16:16:09 -07007196static int __init md_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007197{
Christoph Hellwig3dbd8c22009-03-31 14:27:02 +11007198 if (register_blkdev(MD_MAJOR, "md"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07007199 return -1;
7200 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
Christoph Hellwig3dbd8c22009-03-31 14:27:02 +11007201 unregister_blkdev(MD_MAJOR, "md");
Linus Torvalds1da177e2005-04-16 15:20:36 -07007202 return -1;
7203 }
Christoph Hellwig3dbd8c22009-03-31 14:27:02 +11007204 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
NeilBrowne8703fe2006-10-03 01:15:59 -07007205 md_probe, NULL, NULL);
7206 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07007207 md_probe, NULL, NULL);
7208
Linus Torvalds1da177e2005-04-16 15:20:36 -07007209 register_reboot_notifier(&md_notifier);
Eric W. Biederman0b4d4142007-02-14 00:34:09 -08007210 raid_table_header = register_sysctl_table(raid_root_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007211
7212 md_geninit();
NeilBrownd710e132008-10-13 11:55:12 +11007213 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007214}
7215
7216
7217#ifndef MODULE
7218
7219/*
7220 * Searches all registered partitions for autorun RAID arrays
7221 * at boot time.
7222 */
Michael J. Evans4d936ec2007-10-16 23:30:52 -07007223
7224static LIST_HEAD(all_detected_devices);
7225struct detected_devices_node {
7226 struct list_head list;
7227 dev_t dev;
7228};
Linus Torvalds1da177e2005-04-16 15:20:36 -07007229
7230void md_autodetect_dev(dev_t dev)
7231{
Michael J. Evans4d936ec2007-10-16 23:30:52 -07007232 struct detected_devices_node *node_detected_dev;
7233
7234 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
7235 if (node_detected_dev) {
7236 node_detected_dev->dev = dev;
7237 list_add_tail(&node_detected_dev->list, &all_detected_devices);
7238 } else {
7239 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
7240 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
7241 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07007242}
7243
7244
7245static void autostart_arrays(int part)
7246{
7247 mdk_rdev_t *rdev;
Michael J. Evans4d936ec2007-10-16 23:30:52 -07007248 struct detected_devices_node *node_detected_dev;
7249 dev_t dev;
7250 int i_scanned, i_passed;
7251
7252 i_scanned = 0;
7253 i_passed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007254
7255 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
7256
Michael J. Evans4d936ec2007-10-16 23:30:52 -07007257 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
7258 i_scanned++;
7259 node_detected_dev = list_entry(all_detected_devices.next,
7260 struct detected_devices_node, list);
7261 list_del(&node_detected_dev->list);
7262 dev = node_detected_dev->dev;
7263 kfree(node_detected_dev);
NeilBrowndf968c42007-07-17 04:06:11 -07007264 rdev = md_import_device(dev,0, 90);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007265 if (IS_ERR(rdev))
7266 continue;
7267
NeilBrownb2d444d2005-11-08 21:39:31 -08007268 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007269 MD_BUG();
7270 continue;
7271 }
NeilBrownd0fae182008-03-04 14:29:31 -08007272 set_bit(AutoDetected, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007273 list_add(&rdev->same_set, &pending_raid_disks);
Michael J. Evans4d936ec2007-10-16 23:30:52 -07007274 i_passed++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007275 }
Michael J. Evans4d936ec2007-10-16 23:30:52 -07007276
7277 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
7278 i_scanned, i_passed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007279
7280 autorun_devices(part);
7281}
7282
Jeff Garzikfdee8ae2006-12-10 02:20:50 -08007283#endif /* !MODULE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07007284
7285static __exit void md_exit(void)
7286{
7287 mddev_t *mddev;
7288 struct list_head *tmp;
Greg Kroah-Hartman8ab5e4c2005-06-20 21:15:16 -07007289
Christoph Hellwig3dbd8c22009-03-31 14:27:02 +11007290 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
NeilBrowne8703fe2006-10-03 01:15:59 -07007291 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007292
Christoph Hellwig3dbd8c22009-03-31 14:27:02 +11007293 unregister_blkdev(MD_MAJOR,"md");
Linus Torvalds1da177e2005-04-16 15:20:36 -07007294 unregister_blkdev(mdp_major, "mdp");
7295 unregister_reboot_notifier(&md_notifier);
7296 unregister_sysctl_table(raid_table_header);
7297 remove_proc_entry("mdstat", NULL);
NeilBrown29ac4aa2008-02-06 01:39:58 -08007298 for_each_mddev(mddev, tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007299 export_array(mddev);
NeilBrownd3374822009-01-09 08:31:10 +11007300 mddev->hold_active = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007301 }
7302}
7303
Dan Williams685784a2007-07-09 11:56:42 -07007304subsys_initcall(md_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007305module_exit(md_exit)
7306
NeilBrownf91de922005-11-08 21:39:36 -08007307static int get_ro(char *buffer, struct kernel_param *kp)
7308{
7309 return sprintf(buffer, "%d", start_readonly);
7310}
7311static int set_ro(const char *val, struct kernel_param *kp)
7312{
7313 char *e;
7314 int num = simple_strtoul(val, &e, 10);
7315 if (*val && (*e == '\0' || *e == '\n')) {
7316 start_readonly = num;
NeilBrown4dbcdc72006-01-06 00:20:52 -08007317 return 0;
NeilBrownf91de922005-11-08 21:39:36 -08007318 }
7319 return -EINVAL;
7320}
7321
NeilBrown80ca3a42006-07-10 04:44:18 -07007322module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
7323module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
NeilBrown6ff8d8ec2006-01-06 00:20:15 -08007324
NeilBrownefeb53c2009-01-09 08:31:10 +11007325module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
NeilBrownf91de922005-11-08 21:39:36 -08007326
Linus Torvalds1da177e2005-04-16 15:20:36 -07007327EXPORT_SYMBOL(register_md_personality);
7328EXPORT_SYMBOL(unregister_md_personality);
7329EXPORT_SYMBOL(md_error);
7330EXPORT_SYMBOL(md_done_sync);
7331EXPORT_SYMBOL(md_write_start);
7332EXPORT_SYMBOL(md_write_end);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007333EXPORT_SYMBOL(md_register_thread);
7334EXPORT_SYMBOL(md_unregister_thread);
7335EXPORT_SYMBOL(md_wakeup_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007336EXPORT_SYMBOL(md_check_recovery);
7337MODULE_LICENSE("GPL");
NeilBrown0efb9e62009-12-14 12:49:58 +11007338MODULE_DESCRIPTION("MD RAID framework");
NeilBrownaa1595e2005-08-04 12:53:32 -07007339MODULE_ALIAS("md");
NeilBrown72008652005-08-26 18:34:15 -07007340MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);