blob: acf1b81b47cbeccf74d85cc6bc9f66ee998afbbb [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
35#include <linux/module.h>
Ahmed S. Darwish50511da2007-05-09 02:35:34 -070036#include <linux/kernel.h>
NeilBrowna6fb0932005-09-09 16:23:56 -070037#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/linkage.h>
39#include <linux/raid/md.h>
NeilBrown32a76272005-06-21 17:17:14 -070040#include <linux/raid/bitmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/sysctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/buffer_head.h> /* for invalidate_bdev */
NeilBrownd7603b72006-01-06 00:20:30 -080043#include <linux/poll.h>
Arjan van de Ven48c9c272006-03-27 01:18:20 -080044#include <linux/mutex.h>
NeilBrown16f17b32006-06-26 00:27:37 -070045#include <linux/ctype.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080046#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#include <linux/init.h>
49
NeilBrown32a76272005-06-21 17:17:14 -070050#include <linux/file.h>
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#ifdef CONFIG_KMOD
53#include <linux/kmod.h>
54#endif
55
56#include <asm/unaligned.h>
57
58#define MAJOR_NR MD_MAJOR
59#define MD_DRIVER
60
61/* 63 partitions with the alternate major number (mdp) */
62#define MdpMinorShift 6
63
64#define DEBUG 0
65#define dprintk(x...) ((void)(DEBUG && printk(x)))
66
67
68#ifndef MODULE
69static void autostart_arrays (int part);
70#endif
71
NeilBrown2604b702006-01-06 00:20:36 -080072static LIST_HEAD(pers_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073static DEFINE_SPINLOCK(pers_lock);
74
Adrian Bunk5e563412006-06-26 00:27:42 -070075static void md_print_devices(void);
76
77#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079/*
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
Adrian Bunk338cec32005-09-10 00:26:54 -070083 * the RAID driver will use the maximum available bandwidth if the IO
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
86 * idle IO detection.
87 *
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
NeilBrown88202a02006-01-06 00:21:36 -080089 * or /sys/block/mdX/md/sync_speed_{min,max}
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 */
91
92static int sysctl_speed_limit_min = 1000;
93static int sysctl_speed_limit_max = 200000;
NeilBrown88202a02006-01-06 00:21:36 -080094static inline int speed_min(mddev_t *mddev)
95{
96 return mddev->sync_speed_min ?
97 mddev->sync_speed_min : sysctl_speed_limit_min;
98}
99
100static inline int speed_max(mddev_t *mddev)
101{
102 return mddev->sync_speed_max ?
103 mddev->sync_speed_max : sysctl_speed_limit_max;
104}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106static struct ctl_table_header *raid_table_header;
107
108static ctl_table raid_table[] = {
109 {
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
111 .procname = "speed_limit_min",
112 .data = &sysctl_speed_limit_min,
113 .maxlen = sizeof(int),
NeilBrown80ca3a42006-07-10 04:44:18 -0700114 .mode = S_IRUGO|S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 .proc_handler = &proc_dointvec,
116 },
117 {
118 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
NeilBrown80ca3a42006-07-10 04:44:18 -0700122 .mode = S_IRUGO|S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 .proc_handler = &proc_dointvec,
124 },
125 { .ctl_name = 0 }
126};
127
128static ctl_table raid_dir_table[] = {
129 {
130 .ctl_name = DEV_RAID,
131 .procname = "raid",
132 .maxlen = 0,
NeilBrown80ca3a42006-07-10 04:44:18 -0700133 .mode = S_IRUGO|S_IXUGO,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 .child = raid_table,
135 },
136 { .ctl_name = 0 }
137};
138
139static ctl_table raid_root_table[] = {
140 {
141 .ctl_name = CTL_DEV,
142 .procname = "dev",
143 .maxlen = 0,
144 .mode = 0555,
145 .child = raid_dir_table,
146 },
147 { .ctl_name = 0 }
148};
149
150static struct block_device_operations md_fops;
151
NeilBrownf91de922005-11-08 21:39:36 -0800152static int start_readonly;
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154/*
NeilBrownd7603b72006-01-06 00:20:30 -0800155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
158 * count increases.
159 *
160 * Events are:
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
163 */
NeilBrown2989ddb2006-01-06 00:20:43 -0800164static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
NeilBrownd7603b72006-01-06 00:20:30 -0800165static atomic_t md_event_count;
NeilBrown29269552006-03-27 01:18:10 -0800166void md_new_event(mddev_t *mddev)
NeilBrownd7603b72006-01-06 00:20:30 -0800167{
168 atomic_inc(&md_event_count);
169 wake_up(&md_event_waiters);
NeilBrown4508a7a2006-03-20 17:53:53 +1100170 sysfs_notify(&mddev->kobj, NULL, "sync_action");
NeilBrownd7603b72006-01-06 00:20:30 -0800171}
NeilBrown29269552006-03-27 01:18:10 -0800172EXPORT_SYMBOL_GPL(md_new_event);
NeilBrownd7603b72006-01-06 00:20:30 -0800173
NeilBrownc331eb02006-05-30 21:27:13 -0700174/* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
176 */
Adrian Bunk05381952006-06-26 00:28:01 -0700177static void md_new_event_inintr(mddev_t *mddev)
NeilBrownc331eb02006-05-30 21:27:13 -0700178{
179 atomic_inc(&md_event_count);
180 wake_up(&md_event_waiters);
181}
182
NeilBrownd7603b72006-01-06 00:20:30 -0800183/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
186 */
187static LIST_HEAD(all_mddevs);
188static DEFINE_SPINLOCK(all_mddevs_lock);
189
190
191/*
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
197 */
198#define ITERATE_MDDEV(mddev,tmp) \
199 \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
202 mddev = NULL;}); \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
210 tmp = tmp->next;}) \
211 )
212
213
Jens Axboe165125e2007-07-24 09:28:11 +0200214static int md_fail_request (struct request_queue *q, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
NeilBrown6712ecf2007-09-27 12:47:43 +0200216 bio_io_error(bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 return 0;
218}
219
220static inline mddev_t *mddev_get(mddev_t *mddev)
221{
222 atomic_inc(&mddev->active);
223 return mddev;
224}
225
226static void mddev_put(mddev_t *mddev)
227{
228 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
229 return;
230 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
231 list_del(&mddev->all_mddevs);
NeilBrown926ce2d2006-03-31 02:32:02 -0800232 spin_unlock(&all_mddevs_lock);
Al Viro1312f402006-03-12 11:02:03 -0500233 blk_cleanup_queue(mddev->queue);
NeilBrowneae17012005-11-08 21:39:23 -0800234 kobject_unregister(&mddev->kobj);
NeilBrown926ce2d2006-03-31 02:32:02 -0800235 } else
236 spin_unlock(&all_mddevs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239static mddev_t * mddev_find(dev_t unit)
240{
241 mddev_t *mddev, *new = NULL;
242
243 retry:
244 spin_lock(&all_mddevs_lock);
245 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
246 if (mddev->unit == unit) {
247 mddev_get(mddev);
248 spin_unlock(&all_mddevs_lock);
Jesper Juhl990a8ba2005-06-21 17:17:30 -0700249 kfree(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 return mddev;
251 }
252
253 if (new) {
254 list_add(&new->all_mddevs, &all_mddevs);
255 spin_unlock(&all_mddevs_lock);
256 return new;
257 }
258 spin_unlock(&all_mddevs_lock);
259
NeilBrown9ffae0c2006-01-06 00:20:32 -0800260 new = kzalloc(sizeof(*new), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (!new)
262 return NULL;
263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 new->unit = unit;
265 if (MAJOR(unit) == MD_MAJOR)
266 new->md_minor = MINOR(unit);
267 else
268 new->md_minor = MINOR(unit) >> MdpMinorShift;
269
NeilBrowndf5b89b2006-03-27 01:18:20 -0800270 mutex_init(&new->reconfig_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 INIT_LIST_HEAD(&new->disks);
272 INIT_LIST_HEAD(&new->all_mddevs);
273 init_timer(&new->safemode_timer);
274 atomic_set(&new->active, 1);
NeilBrown06d91a52005-06-21 17:17:12 -0700275 spin_lock_init(&new->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -0700276 init_waitqueue_head(&new->sb_wait);
NeilBrown08a02ec2007-05-09 02:35:38 -0700277 new->reshape_position = MaxSector;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 new->queue = blk_alloc_queue(GFP_KERNEL);
280 if (!new->queue) {
281 kfree(new);
282 return NULL;
283 }
NeilBrown89e5c8b2006-03-27 01:18:02 -0800284 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 blk_queue_make_request(new->queue, md_fail_request);
287
288 goto retry;
289}
290
291static inline int mddev_lock(mddev_t * mddev)
292{
NeilBrowndf5b89b2006-03-27 01:18:20 -0800293 return mutex_lock_interruptible(&mddev->reconfig_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296static inline int mddev_trylock(mddev_t * mddev)
297{
NeilBrowndf5b89b2006-03-27 01:18:20 -0800298 return mutex_trylock(&mddev->reconfig_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300
301static inline void mddev_unlock(mddev_t * mddev)
302{
NeilBrowndf5b89b2006-03-27 01:18:20 -0800303 mutex_unlock(&mddev->reconfig_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
NeilBrown005eca52005-08-22 13:11:08 -0700305 md_wakeup_thread(mddev->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306}
307
NeilBrown2989ddb2006-01-06 00:20:43 -0800308static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
310 mdk_rdev_t * rdev;
311 struct list_head *tmp;
312
313 ITERATE_RDEV(mddev,rdev,tmp) {
314 if (rdev->desc_nr == nr)
315 return rdev;
316 }
317 return NULL;
318}
319
320static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
321{
322 struct list_head *tmp;
323 mdk_rdev_t *rdev;
324
325 ITERATE_RDEV(mddev,rdev,tmp) {
326 if (rdev->bdev->bd_dev == dev)
327 return rdev;
328 }
329 return NULL;
330}
331
NeilBrownd9d166c2006-01-06 00:20:51 -0800332static struct mdk_personality *find_pers(int level, char *clevel)
NeilBrown2604b702006-01-06 00:20:36 -0800333{
334 struct mdk_personality *pers;
NeilBrownd9d166c2006-01-06 00:20:51 -0800335 list_for_each_entry(pers, &pers_list, list) {
336 if (level != LEVEL_NONE && pers->level == level)
NeilBrown2604b702006-01-06 00:20:36 -0800337 return pers;
NeilBrownd9d166c2006-01-06 00:20:51 -0800338 if (strcmp(pers->name, clevel)==0)
339 return pers;
340 }
NeilBrown2604b702006-01-06 00:20:36 -0800341 return NULL;
342}
343
Jesper Juhl77933d72005-07-27 11:46:09 -0700344static inline sector_t calc_dev_sboffset(struct block_device *bdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345{
346 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
347 return MD_NEW_SIZE_BLOCKS(size);
348}
349
350static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
351{
352 sector_t size;
353
354 size = rdev->sb_offset;
355
356 if (chunk_size)
357 size &= ~((sector_t)chunk_size/1024 - 1);
358 return size;
359}
360
361static int alloc_disk_sb(mdk_rdev_t * rdev)
362{
363 if (rdev->sb_page)
364 MD_BUG();
365
366 rdev->sb_page = alloc_page(GFP_KERNEL);
367 if (!rdev->sb_page) {
368 printk(KERN_ALERT "md: out of memory.\n");
369 return -EINVAL;
370 }
371
372 return 0;
373}
374
375static void free_disk_sb(mdk_rdev_t * rdev)
376{
377 if (rdev->sb_page) {
NeilBrown2d1f3b52006-01-06 00:20:31 -0800378 put_page(rdev->sb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 rdev->sb_loaded = 0;
380 rdev->sb_page = NULL;
381 rdev->sb_offset = 0;
382 rdev->size = 0;
383 }
384}
385
386
NeilBrown6712ecf2007-09-27 12:47:43 +0200387static void super_written(struct bio *bio, int error)
NeilBrown7bfa19f2005-06-21 17:17:28 -0700388{
389 mdk_rdev_t *rdev = bio->bi_private;
NeilBrowna9701a32005-11-08 21:39:34 -0800390 mddev_t *mddev = rdev->mddev;
NeilBrown7bfa19f2005-06-21 17:17:28 -0700391
NeilBrown3a0f5bb2006-10-03 01:16:03 -0700392 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
393 printk("md: super_written gets error=%d, uptodate=%d\n",
394 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
395 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
NeilBrowna9701a32005-11-08 21:39:34 -0800396 md_error(mddev, rdev);
NeilBrown3a0f5bb2006-10-03 01:16:03 -0700397 }
NeilBrown7bfa19f2005-06-21 17:17:28 -0700398
NeilBrowna9701a32005-11-08 21:39:34 -0800399 if (atomic_dec_and_test(&mddev->pending_writes))
400 wake_up(&mddev->sb_wait);
Neil Brownf8b58ed2005-06-27 22:29:34 -0700401 bio_put(bio);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700402}
403
NeilBrown6712ecf2007-09-27 12:47:43 +0200404static void super_written_barrier(struct bio *bio, int error)
NeilBrowna9701a32005-11-08 21:39:34 -0800405{
406 struct bio *bio2 = bio->bi_private;
407 mdk_rdev_t *rdev = bio2->bi_private;
408 mddev_t *mddev = rdev->mddev;
NeilBrowna9701a32005-11-08 21:39:34 -0800409
410 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
411 error == -EOPNOTSUPP) {
412 unsigned long flags;
413 /* barriers don't appear to be supported :-( */
414 set_bit(BarriersNotsupp, &rdev->flags);
415 mddev->barriers_work = 0;
416 spin_lock_irqsave(&mddev->write_lock, flags);
417 bio2->bi_next = mddev->biolist;
418 mddev->biolist = bio2;
419 spin_unlock_irqrestore(&mddev->write_lock, flags);
420 wake_up(&mddev->sb_wait);
421 bio_put(bio);
NeilBrown6712ecf2007-09-27 12:47:43 +0200422 } else {
423 bio_put(bio2);
424 bio->bi_private = rdev;
425 super_written(bio, error);
NeilBrowna9701a32005-11-08 21:39:34 -0800426 }
NeilBrowna9701a32005-11-08 21:39:34 -0800427}
428
NeilBrown7bfa19f2005-06-21 17:17:28 -0700429void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
430 sector_t sector, int size, struct page *page)
431{
432 /* write first size bytes of page to sector of rdev
433 * Increment mddev->pending_writes before returning
434 * and decrement it on completion, waking up sb_wait
435 * if zero is reached.
436 * If an error occurred, call md_error
NeilBrowna9701a32005-11-08 21:39:34 -0800437 *
438 * As we might need to resubmit the request if BIO_RW_BARRIER
439 * causes ENOTSUPP, we allocate a spare bio...
NeilBrown7bfa19f2005-06-21 17:17:28 -0700440 */
441 struct bio *bio = bio_alloc(GFP_NOIO, 1);
NeilBrowna9701a32005-11-08 21:39:34 -0800442 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700443
444 bio->bi_bdev = rdev->bdev;
445 bio->bi_sector = sector;
446 bio_add_page(bio, page, size, 0);
447 bio->bi_private = rdev;
448 bio->bi_end_io = super_written;
NeilBrowna9701a32005-11-08 21:39:34 -0800449 bio->bi_rw = rw;
450
NeilBrown7bfa19f2005-06-21 17:17:28 -0700451 atomic_inc(&mddev->pending_writes);
NeilBrowna9701a32005-11-08 21:39:34 -0800452 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
453 struct bio *rbio;
454 rw |= (1<<BIO_RW_BARRIER);
455 rbio = bio_clone(bio, GFP_NOIO);
456 rbio->bi_private = bio;
457 rbio->bi_end_io = super_written_barrier;
458 submit_bio(rw, rbio);
459 } else
460 submit_bio(rw, bio);
461}
462
463void md_super_wait(mddev_t *mddev)
464{
465 /* wait for all superblock writes that were scheduled to complete.
466 * if any had to be retried (due to BARRIER problems), retry them
467 */
468 DEFINE_WAIT(wq);
469 for(;;) {
470 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
471 if (atomic_read(&mddev->pending_writes)==0)
472 break;
473 while (mddev->biolist) {
474 struct bio *bio;
475 spin_lock_irq(&mddev->write_lock);
476 bio = mddev->biolist;
477 mddev->biolist = bio->bi_next ;
478 bio->bi_next = NULL;
479 spin_unlock_irq(&mddev->write_lock);
480 submit_bio(bio->bi_rw, bio);
481 }
482 schedule();
483 }
484 finish_wait(&mddev->sb_wait, &wq);
NeilBrown7bfa19f2005-06-21 17:17:28 -0700485}
486
NeilBrown6712ecf2007-09-27 12:47:43 +0200487static void bi_complete(struct bio *bio, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 complete((struct completion*)bio->bi_private);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490}
491
NeilBrowna654b9d82005-06-21 17:17:27 -0700492int sync_page_io(struct block_device *bdev, sector_t sector, int size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 struct page *page, int rw)
494{
Neil Brownbaaa2c52005-04-16 15:23:54 -0700495 struct bio *bio = bio_alloc(GFP_NOIO, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 struct completion event;
497 int ret;
498
499 rw |= (1 << BIO_RW_SYNC);
500
501 bio->bi_bdev = bdev;
502 bio->bi_sector = sector;
503 bio_add_page(bio, page, size, 0);
504 init_completion(&event);
505 bio->bi_private = &event;
506 bio->bi_end_io = bi_complete;
507 submit_bio(rw, bio);
508 wait_for_completion(&event);
509
510 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
511 bio_put(bio);
512 return ret;
513}
NeilBrowna8745db2006-01-06 00:20:34 -0800514EXPORT_SYMBOL_GPL(sync_page_io);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
NeilBrown0002b272005-09-09 16:23:53 -0700516static int read_disk_sb(mdk_rdev_t * rdev, int size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517{
518 char b[BDEVNAME_SIZE];
519 if (!rdev->sb_page) {
520 MD_BUG();
521 return -EINVAL;
522 }
523 if (rdev->sb_loaded)
524 return 0;
525
526
NeilBrown0002b272005-09-09 16:23:53 -0700527 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 goto fail;
529 rdev->sb_loaded = 1;
530 return 0;
531
532fail:
533 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
534 bdevname(rdev->bdev,b));
535 return -EINVAL;
536}
537
538static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
539{
540 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
541 (sb1->set_uuid1 == sb2->set_uuid1) &&
542 (sb1->set_uuid2 == sb2->set_uuid2) &&
543 (sb1->set_uuid3 == sb2->set_uuid3))
544
545 return 1;
546
547 return 0;
548}
549
550
551static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
552{
553 int ret;
554 mdp_super_t *tmp1, *tmp2;
555
556 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
557 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
558
559 if (!tmp1 || !tmp2) {
560 ret = 0;
561 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
562 goto abort;
563 }
564
565 *tmp1 = *sb1;
566 *tmp2 = *sb2;
567
568 /*
569 * nr_disks is not constant
570 */
571 tmp1->nr_disks = 0;
572 tmp2->nr_disks = 0;
573
574 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
575 ret = 0;
576 else
577 ret = 1;
578
579abort:
Jesper Juhl990a8ba2005-06-21 17:17:30 -0700580 kfree(tmp1);
581 kfree(tmp2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 return ret;
583}
584
NeilBrown4d167f02007-05-09 02:35:37 -0700585
586static u32 md_csum_fold(u32 csum)
587{
588 csum = (csum & 0xffff) + (csum >> 16);
589 return (csum & 0xffff) + (csum >> 16);
590}
591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592static unsigned int calc_sb_csum(mdp_super_t * sb)
593{
NeilBrown4d167f02007-05-09 02:35:37 -0700594 u64 newcsum = 0;
595 u32 *sb32 = (u32*)sb;
596 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 unsigned int disk_csum, csum;
598
599 disk_csum = sb->sb_csum;
600 sb->sb_csum = 0;
NeilBrown4d167f02007-05-09 02:35:37 -0700601
602 for (i = 0; i < MD_SB_BYTES/4 ; i++)
603 newcsum += sb32[i];
604 csum = (newcsum & 0xffffffff) + (newcsum>>32);
605
606
607#ifdef CONFIG_ALPHA
608 /* This used to use csum_partial, which was wrong for several
609 * reasons including that different results are returned on
610 * different architectures. It isn't critical that we get exactly
611 * the same return value as before (we always csum_fold before
612 * testing, and that removes any differences). However as we
613 * know that csum_partial always returned a 16bit value on
614 * alphas, do a fold to maximise conformity to previous behaviour.
615 */
616 sb->sb_csum = md_csum_fold(disk_csum);
617#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 sb->sb_csum = disk_csum;
NeilBrown4d167f02007-05-09 02:35:37 -0700619#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 return csum;
621}
622
623
624/*
625 * Handle superblock details.
626 * We want to be able to handle multiple superblock formats
627 * so we have a common interface to them all, and an array of
628 * different handlers.
629 * We rely on user-space to write the initial superblock, and support
630 * reading and updating of superblocks.
631 * Interface methods are:
632 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
633 * loads and validates a superblock on dev.
634 * if refdev != NULL, compare superblocks on both devices
635 * Return:
636 * 0 - dev has a superblock that is compatible with refdev
637 * 1 - dev has a superblock that is compatible and newer than refdev
638 * so dev should be used as the refdev in future
639 * -EINVAL superblock incompatible or invalid
640 * -othererror e.g. -EIO
641 *
642 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
643 * Verify that dev is acceptable into mddev.
644 * The first time, mddev->raid_disks will be 0, and data from
645 * dev should be merged in. Subsequent calls check that dev
646 * is new enough. Return 0 or -EINVAL
647 *
648 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
649 * Update the superblock for rdev with data in mddev
650 * This does not write to disc.
651 *
652 */
653
654struct super_type {
655 char *name;
656 struct module *owner;
657 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
658 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
659 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
660};
661
662/*
663 * load_super for 0.90.0
664 */
665static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
666{
667 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
668 mdp_super_t *sb;
669 int ret;
670 sector_t sb_offset;
671
672 /*
673 * Calculate the position of the superblock,
674 * it's at the end of the disk.
675 *
676 * It also happens to be a multiple of 4Kb.
677 */
678 sb_offset = calc_dev_sboffset(rdev->bdev);
679 rdev->sb_offset = sb_offset;
680
NeilBrown0002b272005-09-09 16:23:53 -0700681 ret = read_disk_sb(rdev, MD_SB_BYTES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 if (ret) return ret;
683
684 ret = -EINVAL;
685
686 bdevname(rdev->bdev, b);
687 sb = (mdp_super_t*)page_address(rdev->sb_page);
688
689 if (sb->md_magic != MD_SB_MAGIC) {
690 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
691 b);
692 goto abort;
693 }
694
695 if (sb->major_version != 0 ||
NeilBrownf6705572006-03-27 01:18:11 -0800696 sb->minor_version < 90 ||
697 sb->minor_version > 91) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
699 sb->major_version, sb->minor_version,
700 b);
701 goto abort;
702 }
703
704 if (sb->raid_disks <= 0)
705 goto abort;
706
NeilBrown4d167f02007-05-09 02:35:37 -0700707 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
709 b);
710 goto abort;
711 }
712
713 rdev->preferred_minor = sb->md_minor;
714 rdev->data_offset = 0;
NeilBrown0002b272005-09-09 16:23:53 -0700715 rdev->sb_size = MD_SB_BYTES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
NeilBrowne11e93f2007-05-09 02:35:36 -0700717 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
718 if (sb->level != 1 && sb->level != 4
719 && sb->level != 5 && sb->level != 6
720 && sb->level != 10) {
721 /* FIXME use a better test */
722 printk(KERN_WARNING
723 "md: bitmaps not supported for this level.\n");
724 goto abort;
725 }
726 }
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 if (sb->level == LEVEL_MULTIPATH)
729 rdev->desc_nr = -1;
730 else
731 rdev->desc_nr = sb->this_disk.number;
732
733 if (refdev == 0)
734 ret = 1;
735 else {
736 __u64 ev1, ev2;
737 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
738 if (!uuid_equal(refsb, sb)) {
739 printk(KERN_WARNING "md: %s has different UUID to %s\n",
740 b, bdevname(refdev->bdev,b2));
741 goto abort;
742 }
743 if (!sb_equal(refsb, sb)) {
744 printk(KERN_WARNING "md: %s has same UUID"
745 " but different superblock to %s\n",
746 b, bdevname(refdev->bdev, b2));
747 goto abort;
748 }
749 ev1 = md_event(sb);
750 ev2 = md_event(refsb);
751 if (ev1 > ev2)
752 ret = 1;
753 else
754 ret = 0;
755 }
756 rdev->size = calc_dev_size(rdev, sb->chunk_size);
757
NeilBrown2bf071b2006-01-06 00:20:55 -0800758 if (rdev->size < sb->size && sb->level > 1)
759 /* "this cannot possibly happen" ... */
760 ret = -EINVAL;
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 abort:
763 return ret;
764}
765
766/*
767 * validate_super for 0.90.0
768 */
769static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
770{
771 mdp_disk_t *desc;
772 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
NeilBrown07d84d102006-06-26 00:27:56 -0700773 __u64 ev1 = md_event(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
NeilBrown41158c72005-06-21 17:17:25 -0700775 rdev->raid_disk = -1;
NeilBrownb2d444d2005-11-08 21:39:31 -0800776 rdev->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 if (mddev->raid_disks == 0) {
778 mddev->major_version = 0;
779 mddev->minor_version = sb->minor_version;
780 mddev->patch_version = sb->patch_version;
781 mddev->persistent = ! sb->not_persistent;
782 mddev->chunk_size = sb->chunk_size;
783 mddev->ctime = sb->ctime;
784 mddev->utime = sb->utime;
785 mddev->level = sb->level;
NeilBrownd9d166c2006-01-06 00:20:51 -0800786 mddev->clevel[0] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 mddev->layout = sb->layout;
788 mddev->raid_disks = sb->raid_disks;
789 mddev->size = sb->size;
NeilBrown07d84d102006-06-26 00:27:56 -0700790 mddev->events = ev1;
NeilBrown92232142005-08-18 11:24:16 -0700791 mddev->bitmap_offset = 0;
NeilBrown36fa3062005-09-09 16:23:45 -0700792 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
NeilBrownf6705572006-03-27 01:18:11 -0800794 if (mddev->minor_version >= 91) {
795 mddev->reshape_position = sb->reshape_position;
796 mddev->delta_disks = sb->delta_disks;
797 mddev->new_level = sb->new_level;
798 mddev->new_layout = sb->new_layout;
799 mddev->new_chunk = sb->new_chunk;
800 } else {
801 mddev->reshape_position = MaxSector;
802 mddev->delta_disks = 0;
803 mddev->new_level = mddev->level;
804 mddev->new_layout = mddev->layout;
805 mddev->new_chunk = mddev->chunk_size;
806 }
807
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 if (sb->state & (1<<MD_SB_CLEAN))
809 mddev->recovery_cp = MaxSector;
810 else {
811 if (sb->events_hi == sb->cp_events_hi &&
812 sb->events_lo == sb->cp_events_lo) {
813 mddev->recovery_cp = sb->recovery_cp;
814 } else
815 mddev->recovery_cp = 0;
816 }
817
818 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
819 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
820 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
821 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
822
823 mddev->max_disks = MD_SB_DISKS;
NeilBrowna654b9d82005-06-21 17:17:27 -0700824
825 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
NeilBrowne11e93f2007-05-09 02:35:36 -0700826 mddev->bitmap_file == NULL)
NeilBrown36fa3062005-09-09 16:23:45 -0700827 mddev->bitmap_offset = mddev->default_bitmap_offset;
NeilBrowna654b9d82005-06-21 17:17:27 -0700828
NeilBrown41158c72005-06-21 17:17:25 -0700829 } else if (mddev->pers == NULL) {
830 /* Insist on good event counter while assembling */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 ++ev1;
832 if (ev1 < mddev->events)
833 return -EINVAL;
NeilBrown41158c72005-06-21 17:17:25 -0700834 } else if (mddev->bitmap) {
835 /* if adding to array with a bitmap, then we can accept an
836 * older device ... but not too old.
837 */
NeilBrown41158c72005-06-21 17:17:25 -0700838 if (ev1 < mddev->bitmap->events_cleared)
839 return 0;
NeilBrown07d84d102006-06-26 00:27:56 -0700840 } else {
841 if (ev1 < mddev->events)
842 /* just a hot-add of a new device, leave raid_disk at -1 */
843 return 0;
844 }
NeilBrown41158c72005-06-21 17:17:25 -0700845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 if (mddev->level != LEVEL_MULTIPATH) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 desc = sb->disks + rdev->desc_nr;
848
849 if (desc->state & (1<<MD_DISK_FAULTY))
NeilBrownb2d444d2005-11-08 21:39:31 -0800850 set_bit(Faulty, &rdev->flags);
NeilBrown7c7546c2006-06-26 00:27:41 -0700851 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
852 desc->raid_disk < mddev->raid_disks */) {
NeilBrownb2d444d2005-11-08 21:39:31 -0800853 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 rdev->raid_disk = desc->raid_disk;
855 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -0700856 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
857 set_bit(WriteMostly, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -0700858 } else /* MULTIPATH are always insync */
NeilBrownb2d444d2005-11-08 21:39:31 -0800859 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 return 0;
861}
862
863/*
864 * sync_super for 0.90.0
865 */
866static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
867{
868 mdp_super_t *sb;
869 struct list_head *tmp;
870 mdk_rdev_t *rdev2;
871 int next_spare = mddev->raid_disks;
NeilBrown19133a42005-11-08 21:39:35 -0800872
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874 /* make rdev->sb match mddev data..
875 *
876 * 1/ zero out disks
877 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
878 * 3/ any empty disks < next_spare become removed
879 *
880 * disks[0] gets initialised to REMOVED because
881 * we cannot be sure from other fields if it has
882 * been initialised or not.
883 */
884 int i;
885 int active=0, working=0,failed=0,spare=0,nr_disks=0;
886
NeilBrown61181562005-09-09 16:24:02 -0700887 rdev->sb_size = MD_SB_BYTES;
888
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 sb = (mdp_super_t*)page_address(rdev->sb_page);
890
891 memset(sb, 0, sizeof(*sb));
892
893 sb->md_magic = MD_SB_MAGIC;
894 sb->major_version = mddev->major_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 sb->patch_version = mddev->patch_version;
896 sb->gvalid_words = 0; /* ignored */
897 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
898 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
899 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
900 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
901
902 sb->ctime = mddev->ctime;
903 sb->level = mddev->level;
904 sb->size = mddev->size;
905 sb->raid_disks = mddev->raid_disks;
906 sb->md_minor = mddev->md_minor;
907 sb->not_persistent = !mddev->persistent;
908 sb->utime = mddev->utime;
909 sb->state = 0;
910 sb->events_hi = (mddev->events>>32);
911 sb->events_lo = (u32)mddev->events;
912
NeilBrownf6705572006-03-27 01:18:11 -0800913 if (mddev->reshape_position == MaxSector)
914 sb->minor_version = 90;
915 else {
916 sb->minor_version = 91;
917 sb->reshape_position = mddev->reshape_position;
918 sb->new_level = mddev->new_level;
919 sb->delta_disks = mddev->delta_disks;
920 sb->new_layout = mddev->new_layout;
921 sb->new_chunk = mddev->new_chunk;
922 }
923 mddev->minor_version = sb->minor_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 if (mddev->in_sync)
925 {
926 sb->recovery_cp = mddev->recovery_cp;
927 sb->cp_events_hi = (mddev->events>>32);
928 sb->cp_events_lo = (u32)mddev->events;
929 if (mddev->recovery_cp == MaxSector)
930 sb->state = (1<< MD_SB_CLEAN);
931 } else
932 sb->recovery_cp = 0;
933
934 sb->layout = mddev->layout;
935 sb->chunk_size = mddev->chunk_size;
936
NeilBrowna654b9d82005-06-21 17:17:27 -0700937 if (mddev->bitmap && mddev->bitmap_file == NULL)
938 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
939
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 sb->disks[0].state = (1<<MD_DISK_REMOVED);
941 ITERATE_RDEV(mddev,rdev2,tmp) {
942 mdp_disk_t *d;
NeilBrown86e6ffd2005-11-08 21:39:24 -0800943 int desc_nr;
NeilBrownb2d444d2005-11-08 21:39:31 -0800944 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
945 && !test_bit(Faulty, &rdev2->flags))
NeilBrown86e6ffd2005-11-08 21:39:24 -0800946 desc_nr = rdev2->raid_disk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 else
NeilBrown86e6ffd2005-11-08 21:39:24 -0800948 desc_nr = next_spare++;
NeilBrown19133a42005-11-08 21:39:35 -0800949 rdev2->desc_nr = desc_nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 d = &sb->disks[rdev2->desc_nr];
951 nr_disks++;
952 d->number = rdev2->desc_nr;
953 d->major = MAJOR(rdev2->bdev->bd_dev);
954 d->minor = MINOR(rdev2->bdev->bd_dev);
NeilBrownb2d444d2005-11-08 21:39:31 -0800955 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
956 && !test_bit(Faulty, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 d->raid_disk = rdev2->raid_disk;
958 else
959 d->raid_disk = rdev2->desc_nr; /* compatibility */
NeilBrown1be78922006-03-27 01:18:03 -0800960 if (test_bit(Faulty, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 d->state = (1<<MD_DISK_FAULTY);
NeilBrown1be78922006-03-27 01:18:03 -0800962 else if (test_bit(In_sync, &rdev2->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 d->state = (1<<MD_DISK_ACTIVE);
964 d->state |= (1<<MD_DISK_SYNC);
965 active++;
966 working++;
967 } else {
968 d->state = 0;
969 spare++;
970 working++;
971 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -0700972 if (test_bit(WriteMostly, &rdev2->flags))
973 d->state |= (1<<MD_DISK_WRITEMOSTLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 /* now set the "removed" and "faulty" bits on any missing devices */
976 for (i=0 ; i < mddev->raid_disks ; i++) {
977 mdp_disk_t *d = &sb->disks[i];
978 if (d->state == 0 && d->number == 0) {
979 d->number = i;
980 d->raid_disk = i;
981 d->state = (1<<MD_DISK_REMOVED);
982 d->state |= (1<<MD_DISK_FAULTY);
983 failed++;
984 }
985 }
986 sb->nr_disks = nr_disks;
987 sb->active_disks = active;
988 sb->working_disks = working;
989 sb->failed_disks = failed;
990 sb->spare_disks = spare;
991
992 sb->this_disk = sb->disks[rdev->desc_nr];
993 sb->sb_csum = calc_sb_csum(sb);
994}
995
996/*
997 * version 1 superblock
998 */
999
NeilBrown1c05b4b2006-10-21 10:24:08 -07001000static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
NeilBrown1c05b4b2006-10-21 10:24:08 -07001002 __le32 disk_csum;
1003 u32 csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 unsigned long long newcsum;
1005 int size = 256 + le32_to_cpu(sb->max_dev)*2;
NeilBrown1c05b4b2006-10-21 10:24:08 -07001006 __le32 *isuper = (__le32*)sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 int i;
1008
1009 disk_csum = sb->sb_csum;
1010 sb->sb_csum = 0;
1011 newcsum = 0;
1012 for (i=0; size>=4; size -= 4 )
1013 newcsum += le32_to_cpu(*isuper++);
1014
1015 if (size == 2)
NeilBrown1c05b4b2006-10-21 10:24:08 -07001016 newcsum += le16_to_cpu(*(__le16*) isuper);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
1018 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1019 sb->sb_csum = disk_csum;
1020 return cpu_to_le32(csum);
1021}
1022
1023static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1024{
1025 struct mdp_superblock_1 *sb;
1026 int ret;
1027 sector_t sb_offset;
1028 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
NeilBrown0002b272005-09-09 16:23:53 -07001029 int bmask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
1031 /*
1032 * Calculate the position of the superblock.
1033 * It is always aligned to a 4K boundary and
1034 * depeding on minor_version, it can be:
1035 * 0: At least 8K, but less than 12K, from end of device
1036 * 1: At start of device
1037 * 2: 4K from start of device.
1038 */
1039 switch(minor_version) {
1040 case 0:
1041 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1042 sb_offset -= 8*2;
NeilBrown39730962005-06-21 17:17:28 -07001043 sb_offset &= ~(sector_t)(4*2-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 /* convert from sectors to K */
1045 sb_offset /= 2;
1046 break;
1047 case 1:
1048 sb_offset = 0;
1049 break;
1050 case 2:
1051 sb_offset = 4;
1052 break;
1053 default:
1054 return -EINVAL;
1055 }
1056 rdev->sb_offset = sb_offset;
1057
NeilBrown0002b272005-09-09 16:23:53 -07001058 /* superblock is rarely larger than 1K, but it can be larger,
1059 * and it is safe to read 4k, so we do that
1060 */
1061 ret = read_disk_sb(rdev, 4096);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 if (ret) return ret;
1063
1064
1065 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1066
1067 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1068 sb->major_version != cpu_to_le32(1) ||
1069 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1070 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
NeilBrown71c08052005-09-09 16:23:51 -07001071 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 return -EINVAL;
1073
1074 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1075 printk("md: invalid superblock checksum on %s\n",
1076 bdevname(rdev->bdev,b));
1077 return -EINVAL;
1078 }
1079 if (le64_to_cpu(sb->data_size) < 10) {
1080 printk("md: data_size too small on %s\n",
1081 bdevname(rdev->bdev,b));
1082 return -EINVAL;
1083 }
NeilBrowne11e93f2007-05-09 02:35:36 -07001084 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1085 if (sb->level != cpu_to_le32(1) &&
1086 sb->level != cpu_to_le32(4) &&
1087 sb->level != cpu_to_le32(5) &&
1088 sb->level != cpu_to_le32(6) &&
1089 sb->level != cpu_to_le32(10)) {
1090 printk(KERN_WARNING
1091 "md: bitmaps not supported for this level.\n");
1092 return -EINVAL;
1093 }
1094 }
1095
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 rdev->preferred_minor = 0xffff;
1097 rdev->data_offset = le64_to_cpu(sb->data_offset);
NeilBrown4dbcdc72006-01-06 00:20:52 -08001098 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
NeilBrown0002b272005-09-09 16:23:53 -07001100 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
NeilBrown720a3dc2005-09-09 16:23:59 -07001101 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
NeilBrown0002b272005-09-09 16:23:53 -07001102 if (rdev->sb_size & bmask)
1103 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1104
NeilBrown31b65a02006-07-10 04:44:14 -07001105 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1106 rdev->desc_nr = -1;
1107 else
1108 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 if (refdev == 0)
NeilBrown8ed75462006-02-03 03:03:41 -08001111 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 else {
1113 __u64 ev1, ev2;
1114 struct mdp_superblock_1 *refsb =
1115 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1116
1117 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1118 sb->level != refsb->level ||
1119 sb->layout != refsb->layout ||
1120 sb->chunksize != refsb->chunksize) {
1121 printk(KERN_WARNING "md: %s has strangely different"
1122 " superblock to %s\n",
1123 bdevname(rdev->bdev,b),
1124 bdevname(refdev->bdev,b2));
1125 return -EINVAL;
1126 }
1127 ev1 = le64_to_cpu(sb->events);
1128 ev2 = le64_to_cpu(refsb->events);
1129
1130 if (ev1 > ev2)
NeilBrown8ed75462006-02-03 03:03:41 -08001131 ret = 1;
1132 else
1133 ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 }
1135 if (minor_version)
1136 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1137 else
1138 rdev->size = rdev->sb_offset;
1139 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1140 return -EINVAL;
1141 rdev->size = le64_to_cpu(sb->data_size)/2;
1142 if (le32_to_cpu(sb->chunksize))
1143 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
NeilBrown2bf071b2006-01-06 00:20:55 -08001144
NeilBrown1c05b4b2006-10-21 10:24:08 -07001145 if (le64_to_cpu(sb->size) > rdev->size*2)
NeilBrown2bf071b2006-01-06 00:20:55 -08001146 return -EINVAL;
NeilBrown8ed75462006-02-03 03:03:41 -08001147 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148}
1149
1150static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1151{
1152 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
NeilBrown07d84d102006-06-26 00:27:56 -07001153 __u64 ev1 = le64_to_cpu(sb->events);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
NeilBrown41158c72005-06-21 17:17:25 -07001155 rdev->raid_disk = -1;
NeilBrownb2d444d2005-11-08 21:39:31 -08001156 rdev->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 if (mddev->raid_disks == 0) {
1158 mddev->major_version = 1;
1159 mddev->patch_version = 0;
1160 mddev->persistent = 1;
1161 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1162 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1163 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1164 mddev->level = le32_to_cpu(sb->level);
NeilBrownd9d166c2006-01-06 00:20:51 -08001165 mddev->clevel[0] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 mddev->layout = le32_to_cpu(sb->layout);
1167 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1168 mddev->size = le64_to_cpu(sb->size)/2;
NeilBrown07d84d102006-06-26 00:27:56 -07001169 mddev->events = ev1;
NeilBrown92232142005-08-18 11:24:16 -07001170 mddev->bitmap_offset = 0;
NeilBrown29fc7e32006-02-03 03:03:41 -08001171 mddev->default_bitmap_offset = 1024 >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1174 memcpy(mddev->uuid, sb->set_uuid, 16);
1175
1176 mddev->max_disks = (4096-256)/2;
NeilBrowna654b9d82005-06-21 17:17:27 -07001177
NeilBrown71c08052005-09-09 16:23:51 -07001178 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
NeilBrowne11e93f2007-05-09 02:35:36 -07001179 mddev->bitmap_file == NULL )
NeilBrowna654b9d82005-06-21 17:17:27 -07001180 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
NeilBrowne11e93f2007-05-09 02:35:36 -07001181
NeilBrownf6705572006-03-27 01:18:11 -08001182 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1183 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1184 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1185 mddev->new_level = le32_to_cpu(sb->new_level);
1186 mddev->new_layout = le32_to_cpu(sb->new_layout);
1187 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1188 } else {
1189 mddev->reshape_position = MaxSector;
1190 mddev->delta_disks = 0;
1191 mddev->new_level = mddev->level;
1192 mddev->new_layout = mddev->layout;
1193 mddev->new_chunk = mddev->chunk_size;
1194 }
1195
NeilBrown41158c72005-06-21 17:17:25 -07001196 } else if (mddev->pers == NULL) {
1197 /* Insist of good event counter while assembling */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 ++ev1;
1199 if (ev1 < mddev->events)
1200 return -EINVAL;
NeilBrown41158c72005-06-21 17:17:25 -07001201 } else if (mddev->bitmap) {
1202 /* If adding to array with a bitmap, then we can accept an
1203 * older device, but not too old.
1204 */
NeilBrown41158c72005-06-21 17:17:25 -07001205 if (ev1 < mddev->bitmap->events_cleared)
1206 return 0;
NeilBrown07d84d102006-06-26 00:27:56 -07001207 } else {
1208 if (ev1 < mddev->events)
1209 /* just a hot-add of a new device, leave raid_disk at -1 */
1210 return 0;
1211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 if (mddev->level != LEVEL_MULTIPATH) {
1213 int role;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1215 switch(role) {
1216 case 0xffff: /* spare */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 break;
1218 case 0xfffe: /* faulty */
NeilBrownb2d444d2005-11-08 21:39:31 -08001219 set_bit(Faulty, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 break;
1221 default:
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001222 if ((le32_to_cpu(sb->feature_map) &
1223 MD_FEATURE_RECOVERY_OFFSET))
1224 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1225 else
1226 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 rdev->raid_disk = role;
1228 break;
1229 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -07001230 if (sb->devflags & WriteMostly1)
1231 set_bit(WriteMostly, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -07001232 } else /* MULTIPATH are always insync */
NeilBrownb2d444d2005-11-08 21:39:31 -08001233 set_bit(In_sync, &rdev->flags);
NeilBrown41158c72005-06-21 17:17:25 -07001234
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 return 0;
1236}
1237
1238static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1239{
1240 struct mdp_superblock_1 *sb;
1241 struct list_head *tmp;
1242 mdk_rdev_t *rdev2;
1243 int max_dev, i;
1244 /* make rdev->sb match mddev and rdev data. */
1245
1246 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1247
1248 sb->feature_map = 0;
1249 sb->pad0 = 0;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001250 sb->recovery_offset = cpu_to_le64(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 memset(sb->pad1, 0, sizeof(sb->pad1));
1252 memset(sb->pad2, 0, sizeof(sb->pad2));
1253 memset(sb->pad3, 0, sizeof(sb->pad3));
1254
1255 sb->utime = cpu_to_le64((__u64)mddev->utime);
1256 sb->events = cpu_to_le64(mddev->events);
1257 if (mddev->in_sync)
1258 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1259 else
1260 sb->resync_offset = cpu_to_le64(0);
1261
NeilBrown1c05b4b2006-10-21 10:24:08 -07001262 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
NeilBrown4dbcdc72006-01-06 00:20:52 -08001263
NeilBrownf0ca3402006-02-02 14:28:04 -08001264 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
NeilBrown29fc7e32006-02-03 03:03:41 -08001265 sb->size = cpu_to_le64(mddev->size<<1);
NeilBrownf0ca3402006-02-02 14:28:04 -08001266
NeilBrowna654b9d82005-06-21 17:17:27 -07001267 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1268 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
NeilBrown71c08052005-09-09 16:23:51 -07001269 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
NeilBrowna654b9d82005-06-21 17:17:27 -07001270 }
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001271
1272 if (rdev->raid_disk >= 0 &&
1273 !test_bit(In_sync, &rdev->flags) &&
1274 rdev->recovery_offset > 0) {
1275 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1276 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1277 }
1278
NeilBrownf6705572006-03-27 01:18:11 -08001279 if (mddev->reshape_position != MaxSector) {
1280 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1281 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1282 sb->new_layout = cpu_to_le32(mddev->new_layout);
1283 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1284 sb->new_level = cpu_to_le32(mddev->new_level);
1285 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1286 }
NeilBrowna654b9d82005-06-21 17:17:27 -07001287
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 max_dev = 0;
1289 ITERATE_RDEV(mddev,rdev2,tmp)
1290 if (rdev2->desc_nr+1 > max_dev)
1291 max_dev = rdev2->desc_nr+1;
NeilBrowna778b732007-05-23 13:58:10 -07001292
1293 if (max_dev > le32_to_cpu(sb->max_dev))
1294 sb->max_dev = cpu_to_le32(max_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 for (i=0; i<max_dev;i++)
1296 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1297
1298 ITERATE_RDEV(mddev,rdev2,tmp) {
1299 i = rdev2->desc_nr;
NeilBrownb2d444d2005-11-08 21:39:31 -08001300 if (test_bit(Faulty, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 sb->dev_roles[i] = cpu_to_le16(0xfffe);
NeilBrownb2d444d2005-11-08 21:39:31 -08001302 else if (test_bit(In_sync, &rdev2->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
NeilBrown5fd6c1d2006-06-26 00:27:40 -07001304 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1305 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 else
1307 sb->dev_roles[i] = cpu_to_le16(0xffff);
1308 }
1309
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 sb->sb_csum = calc_sb_1_csum(sb);
1311}
1312
1313
Adrian Bunk75c96f82005-05-05 16:16:09 -07001314static struct super_type super_types[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 [0] = {
1316 .name = "0.90.0",
1317 .owner = THIS_MODULE,
1318 .load_super = super_90_load,
1319 .validate_super = super_90_validate,
1320 .sync_super = super_90_sync,
1321 },
1322 [1] = {
1323 .name = "md-1",
1324 .owner = THIS_MODULE,
1325 .load_super = super_1_load,
1326 .validate_super = super_1_validate,
1327 .sync_super = super_1_sync,
1328 },
1329};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330
1331static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1332{
NeilBrown7dd5e7c32007-02-28 20:11:35 -08001333 struct list_head *tmp, *tmp2;
1334 mdk_rdev_t *rdev, *rdev2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335
1336 ITERATE_RDEV(mddev1,rdev,tmp)
NeilBrown7dd5e7c32007-02-28 20:11:35 -08001337 ITERATE_RDEV(mddev2, rdev2, tmp2)
1338 if (rdev->bdev->bd_contains ==
1339 rdev2->bdev->bd_contains)
1340 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341
1342 return 0;
1343}
1344
1345static LIST_HEAD(pending_raid_disks);
1346
1347static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1348{
NeilBrown7dd5e7c32007-02-28 20:11:35 -08001349 char b[BDEVNAME_SIZE];
NeilBrownf637b9f2005-11-08 21:39:37 -08001350 struct kobject *ko;
Neil Brown1edf80d2006-01-12 01:05:23 -08001351 char *s;
NeilBrown5e55e2f2007-03-26 21:32:14 -08001352 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
1354 if (rdev->mddev) {
1355 MD_BUG();
1356 return -EINVAL;
1357 }
NeilBrown2bf071b2006-01-06 00:20:55 -08001358 /* make sure rdev->size exceeds mddev->size */
1359 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
NeilBrowna778b732007-05-23 13:58:10 -07001360 if (mddev->pers) {
1361 /* Cannot change size, so fail
1362 * If mddev->level <= 0, then we don't care
1363 * about aligning sizes (e.g. linear)
1364 */
1365 if (mddev->level > 0)
1366 return -ENOSPC;
1367 } else
NeilBrown2bf071b2006-01-06 00:20:55 -08001368 mddev->size = rdev->size;
1369 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
1371 /* Verify rdev->desc_nr is unique.
1372 * If it is -1, assign a free number, else
1373 * check number is not in use
1374 */
1375 if (rdev->desc_nr < 0) {
1376 int choice = 0;
1377 if (mddev->pers) choice = mddev->raid_disks;
1378 while (find_rdev_nr(mddev, choice))
1379 choice++;
1380 rdev->desc_nr = choice;
1381 } else {
1382 if (find_rdev_nr(mddev, rdev->desc_nr))
1383 return -EBUSY;
1384 }
NeilBrown19133a42005-11-08 21:39:35 -08001385 bdevname(rdev->bdev,b);
1386 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1387 return -ENOMEM;
Neil Brown1edf80d2006-01-12 01:05:23 -08001388 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1389 *s = '!';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 rdev->mddev = mddev;
NeilBrown19133a42005-11-08 21:39:35 -08001392 printk(KERN_INFO "md: bind<%s>\n", b);
NeilBrown86e6ffd2005-11-08 21:39:24 -08001393
NeilBrown9c791972005-11-08 21:39:28 -08001394 rdev->kobj.parent = &mddev->kobj;
NeilBrown5e55e2f2007-03-26 21:32:14 -08001395 if ((err = kobject_add(&rdev->kobj)))
1396 goto fail;
NeilBrown86e6ffd2005-11-08 21:39:24 -08001397
NeilBrownf637b9f2005-11-08 21:39:37 -08001398 if (rdev->bdev->bd_part)
1399 ko = &rdev->bdev->bd_part->kobj;
1400 else
1401 ko = &rdev->bdev->bd_disk->kobj;
NeilBrown5e55e2f2007-03-26 21:32:14 -08001402 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1403 kobject_del(&rdev->kobj);
1404 goto fail;
1405 }
1406 list_add(&rdev->same_set, &mddev->disks);
Jun'ichi Nomura5463c792006-03-27 01:17:58 -08001407 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 return 0;
NeilBrown5e55e2f2007-03-26 21:32:14 -08001409
1410 fail:
1411 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1412 b, mdname(mddev));
1413 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414}
1415
NeilBrown5792a282007-04-04 19:08:18 -07001416static void delayed_delete(struct work_struct *ws)
1417{
1418 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1419 kobject_del(&rdev->kobj);
1420}
1421
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1423{
1424 char b[BDEVNAME_SIZE];
1425 if (!rdev->mddev) {
1426 MD_BUG();
1427 return;
1428 }
Jun'ichi Nomura5463c792006-03-27 01:17:58 -08001429 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 list_del_init(&rdev->same_set);
1431 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1432 rdev->mddev = NULL;
NeilBrown86e6ffd2005-11-08 21:39:24 -08001433 sysfs_remove_link(&rdev->kobj, "block");
NeilBrown5792a282007-04-04 19:08:18 -07001434
1435 /* We need to delay this, otherwise we can deadlock when
1436 * writing to 'remove' to "dev/state"
1437 */
1438 INIT_WORK(&rdev->del_work, delayed_delete);
1439 schedule_work(&rdev->del_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440}
1441
1442/*
1443 * prevent the device from being mounted, repartitioned or
1444 * otherwise reused by a RAID array (or any other kernel
1445 * subsystem), by bd_claiming the device.
1446 */
1447static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1448{
1449 int err = 0;
1450 struct block_device *bdev;
1451 char b[BDEVNAME_SIZE];
1452
Peter Zijlstra2e7b6512006-12-08 02:36:13 -08001453 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 if (IS_ERR(bdev)) {
1455 printk(KERN_ERR "md: could not open %s.\n",
1456 __bdevname(dev, b));
1457 return PTR_ERR(bdev);
1458 }
1459 err = bd_claim(bdev, rdev);
1460 if (err) {
1461 printk(KERN_ERR "md: could not bd_claim %s.\n",
1462 bdevname(bdev, b));
Peter Zijlstra2e7b6512006-12-08 02:36:13 -08001463 blkdev_put(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 return err;
1465 }
1466 rdev->bdev = bdev;
1467 return err;
1468}
1469
1470static void unlock_rdev(mdk_rdev_t *rdev)
1471{
1472 struct block_device *bdev = rdev->bdev;
1473 rdev->bdev = NULL;
1474 if (!bdev)
1475 MD_BUG();
1476 bd_release(bdev);
Peter Zijlstra2e7b6512006-12-08 02:36:13 -08001477 blkdev_put(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478}
1479
1480void md_autodetect_dev(dev_t dev);
1481
1482static void export_rdev(mdk_rdev_t * rdev)
1483{
1484 char b[BDEVNAME_SIZE];
1485 printk(KERN_INFO "md: export_rdev(%s)\n",
1486 bdevname(rdev->bdev,b));
1487 if (rdev->mddev)
1488 MD_BUG();
1489 free_disk_sb(rdev);
1490 list_del_init(&rdev->same_set);
1491#ifndef MODULE
1492 md_autodetect_dev(rdev->bdev->bd_dev);
1493#endif
1494 unlock_rdev(rdev);
NeilBrown86e6ffd2005-11-08 21:39:24 -08001495 kobject_put(&rdev->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496}
1497
1498static void kick_rdev_from_array(mdk_rdev_t * rdev)
1499{
1500 unbind_rdev_from_array(rdev);
1501 export_rdev(rdev);
1502}
1503
1504static void export_array(mddev_t *mddev)
1505{
1506 struct list_head *tmp;
1507 mdk_rdev_t *rdev;
1508
1509 ITERATE_RDEV(mddev,rdev,tmp) {
1510 if (!rdev->mddev) {
1511 MD_BUG();
1512 continue;
1513 }
1514 kick_rdev_from_array(rdev);
1515 }
1516 if (!list_empty(&mddev->disks))
1517 MD_BUG();
1518 mddev->raid_disks = 0;
1519 mddev->major_version = 0;
1520}
1521
1522static void print_desc(mdp_disk_t *desc)
1523{
1524 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1525 desc->major,desc->minor,desc->raid_disk,desc->state);
1526}
1527
1528static void print_sb(mdp_super_t *sb)
1529{
1530 int i;
1531
1532 printk(KERN_INFO
1533 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1534 sb->major_version, sb->minor_version, sb->patch_version,
1535 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1536 sb->ctime);
1537 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1538 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1539 sb->md_minor, sb->layout, sb->chunk_size);
1540 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1541 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1542 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1543 sb->failed_disks, sb->spare_disks,
1544 sb->sb_csum, (unsigned long)sb->events_lo);
1545
1546 printk(KERN_INFO);
1547 for (i = 0; i < MD_SB_DISKS; i++) {
1548 mdp_disk_t *desc;
1549
1550 desc = sb->disks + i;
1551 if (desc->number || desc->major || desc->minor ||
1552 desc->raid_disk || (desc->state && (desc->state != 4))) {
1553 printk(" D %2d: ", i);
1554 print_desc(desc);
1555 }
1556 }
1557 printk(KERN_INFO "md: THIS: ");
1558 print_desc(&sb->this_disk);
1559
1560}
1561
1562static void print_rdev(mdk_rdev_t *rdev)
1563{
1564 char b[BDEVNAME_SIZE];
1565 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1566 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
NeilBrownb2d444d2005-11-08 21:39:31 -08001567 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1568 rdev->desc_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 if (rdev->sb_loaded) {
1570 printk(KERN_INFO "md: rdev superblock:\n");
1571 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1572 } else
1573 printk(KERN_INFO "md: no rdev superblock!\n");
1574}
1575
Adrian Bunk5e563412006-06-26 00:27:42 -07001576static void md_print_devices(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577{
1578 struct list_head *tmp, *tmp2;
1579 mdk_rdev_t *rdev;
1580 mddev_t *mddev;
1581 char b[BDEVNAME_SIZE];
1582
1583 printk("\n");
1584 printk("md: **********************************\n");
1585 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1586 printk("md: **********************************\n");
1587 ITERATE_MDDEV(mddev,tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588
NeilBrown32a76272005-06-21 17:17:14 -07001589 if (mddev->bitmap)
1590 bitmap_print_sb(mddev->bitmap);
1591 else
1592 printk("%s: ", mdname(mddev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 ITERATE_RDEV(mddev,rdev,tmp2)
1594 printk("<%s>", bdevname(rdev->bdev,b));
1595 printk("\n");
1596
1597 ITERATE_RDEV(mddev,rdev,tmp2)
1598 print_rdev(rdev);
1599 }
1600 printk("md: **********************************\n");
1601 printk("\n");
1602}
1603
1604
NeilBrown42543762006-06-26 00:27:57 -07001605static void sync_sbs(mddev_t * mddev, int nospares)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606{
NeilBrown42543762006-06-26 00:27:57 -07001607 /* Update each superblock (in-memory image), but
1608 * if we are allowed to, skip spares which already
1609 * have the right event counter, or have one earlier
1610 * (which would mean they aren't being marked as dirty
1611 * with the rest of the array)
1612 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 mdk_rdev_t *rdev;
1614 struct list_head *tmp;
1615
1616 ITERATE_RDEV(mddev,rdev,tmp) {
NeilBrown42543762006-06-26 00:27:57 -07001617 if (rdev->sb_events == mddev->events ||
1618 (nospares &&
1619 rdev->raid_disk < 0 &&
1620 (rdev->sb_events&1)==0 &&
1621 rdev->sb_events+1 == mddev->events)) {
1622 /* Don't update this superblock */
1623 rdev->sb_loaded = 2;
1624 } else {
1625 super_types[mddev->major_version].
1626 sync_super(mddev, rdev);
1627 rdev->sb_loaded = 1;
1628 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 }
1630}
1631
NeilBrown850b2b42006-10-03 01:15:46 -07001632static void md_update_sb(mddev_t * mddev, int force_change)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 struct list_head *tmp;
1635 mdk_rdev_t *rdev;
NeilBrown06d91a52005-06-21 17:17:12 -07001636 int sync_req;
NeilBrown42543762006-06-26 00:27:57 -07001637 int nospares = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639repeat:
NeilBrowna9701a32005-11-08 21:39:34 -08001640 spin_lock_irq(&mddev->write_lock);
NeilBrown84692192006-08-27 01:23:49 -07001641
NeilBrown850b2b42006-10-03 01:15:46 -07001642 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1643 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1644 force_change = 1;
1645 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1646 /* just a clean<-> dirty transition, possibly leave spares alone,
1647 * though if events isn't the right even/odd, we will have to do
1648 * spares after all
1649 */
1650 nospares = 1;
1651 if (force_change)
1652 nospares = 0;
1653 if (mddev->degraded)
NeilBrown84692192006-08-27 01:23:49 -07001654 /* If the array is degraded, then skipping spares is both
1655 * dangerous and fairly pointless.
1656 * Dangerous because a device that was removed from the array
1657 * might have a event_count that still looks up-to-date,
1658 * so it can be re-added without a resync.
1659 * Pointless because if there are any spares to skip,
1660 * then a recovery will happen and soon that array won't
1661 * be degraded any more and the spare can go back to sleep then.
1662 */
NeilBrown850b2b42006-10-03 01:15:46 -07001663 nospares = 0;
NeilBrown84692192006-08-27 01:23:49 -07001664
NeilBrown06d91a52005-06-21 17:17:12 -07001665 sync_req = mddev->in_sync;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 mddev->utime = get_seconds();
NeilBrown42543762006-06-26 00:27:57 -07001667
1668 /* If this is just a dirty<->clean transition, and the array is clean
1669 * and 'events' is odd, we can roll back to the previous clean state */
NeilBrown850b2b42006-10-03 01:15:46 -07001670 if (nospares
NeilBrown42543762006-06-26 00:27:57 -07001671 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
NeilBrown1031be72007-01-26 00:57:02 -08001672 && (mddev->events & 1)
1673 && mddev->events != 1)
NeilBrown42543762006-06-26 00:27:57 -07001674 mddev->events--;
1675 else {
1676 /* otherwise we have to go forward and ... */
1677 mddev->events ++;
1678 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1679 /* .. if the array isn't clean, insist on an odd 'events' */
1680 if ((mddev->events&1)==0) {
1681 mddev->events++;
1682 nospares = 0;
1683 }
1684 } else {
1685 /* otherwise insist on an even 'events' (for clean states) */
1686 if ((mddev->events&1)) {
1687 mddev->events++;
1688 nospares = 0;
1689 }
1690 }
1691 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692
1693 if (!mddev->events) {
1694 /*
1695 * oops, this 64-bit counter should never wrap.
1696 * Either we are in around ~1 trillion A.C., assuming
1697 * 1 reboot per second, or we have a bug:
1698 */
1699 MD_BUG();
1700 mddev->events --;
1701 }
NeilBrown42543762006-06-26 00:27:57 -07001702 sync_sbs(mddev, nospares);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703
1704 /*
1705 * do not write anything to disk if using
1706 * nonpersistent superblocks
1707 */
NeilBrown06d91a52005-06-21 17:17:12 -07001708 if (!mddev->persistent) {
NeilBrown850b2b42006-10-03 01:15:46 -07001709 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
NeilBrowna9701a32005-11-08 21:39:34 -08001710 spin_unlock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07001711 wake_up(&mddev->sb_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 return;
NeilBrown06d91a52005-06-21 17:17:12 -07001713 }
NeilBrowna9701a32005-11-08 21:39:34 -08001714 spin_unlock_irq(&mddev->write_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715
1716 dprintk(KERN_INFO
1717 "md: updating %s RAID superblock on device (in sync %d)\n",
1718 mdname(mddev),mddev->in_sync);
1719
NeilBrown4ad13662007-07-17 04:06:13 -07001720 bitmap_update_sb(mddev->bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 ITERATE_RDEV(mddev,rdev,tmp) {
1722 char b[BDEVNAME_SIZE];
1723 dprintk(KERN_INFO "md: ");
NeilBrown42543762006-06-26 00:27:57 -07001724 if (rdev->sb_loaded != 1)
1725 continue; /* no noise on spare devices */
NeilBrownb2d444d2005-11-08 21:39:31 -08001726 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 dprintk("(skipping faulty ");
1728
1729 dprintk("%s ", bdevname(rdev->bdev,b));
NeilBrownb2d444d2005-11-08 21:39:31 -08001730 if (!test_bit(Faulty, &rdev->flags)) {
NeilBrown7bfa19f2005-06-21 17:17:28 -07001731 md_super_write(mddev,rdev,
NeilBrown0002b272005-09-09 16:23:53 -07001732 rdev->sb_offset<<1, rdev->sb_size,
NeilBrown7bfa19f2005-06-21 17:17:28 -07001733 rdev->sb_page);
1734 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1735 bdevname(rdev->bdev,b),
1736 (unsigned long long)rdev->sb_offset);
NeilBrown42543762006-06-26 00:27:57 -07001737 rdev->sb_events = mddev->events;
NeilBrown7bfa19f2005-06-21 17:17:28 -07001738
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 } else
1740 dprintk(")\n");
NeilBrown7bfa19f2005-06-21 17:17:28 -07001741 if (mddev->level == LEVEL_MULTIPATH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 /* only need to write one superblock... */
1743 break;
1744 }
NeilBrowna9701a32005-11-08 21:39:34 -08001745 md_super_wait(mddev);
NeilBrown850b2b42006-10-03 01:15:46 -07001746 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
NeilBrown7bfa19f2005-06-21 17:17:28 -07001747
NeilBrowna9701a32005-11-08 21:39:34 -08001748 spin_lock_irq(&mddev->write_lock);
NeilBrown850b2b42006-10-03 01:15:46 -07001749 if (mddev->in_sync != sync_req ||
1750 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
NeilBrown06d91a52005-06-21 17:17:12 -07001751 /* have to write it out again */
NeilBrowna9701a32005-11-08 21:39:34 -08001752 spin_unlock_irq(&mddev->write_lock);
NeilBrown06d91a52005-06-21 17:17:12 -07001753 goto repeat;
1754 }
NeilBrown850b2b42006-10-03 01:15:46 -07001755 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
NeilBrowna9701a32005-11-08 21:39:34 -08001756 spin_unlock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07001757 wake_up(&mddev->sb_wait);
NeilBrown06d91a52005-06-21 17:17:12 -07001758
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759}
1760
NeilBrownbce74da2006-01-06 00:20:41 -08001761/* words written to sysfs files may, or my not, be \n terminated.
1762 * We want to accept with case. For this we use cmd_match.
1763 */
1764static int cmd_match(const char *cmd, const char *str)
1765{
1766 /* See if cmd, written into a sysfs file, matches
1767 * str. They must either be the same, or cmd can
1768 * have a trailing newline
1769 */
1770 while (*cmd && *str && *cmd == *str) {
1771 cmd++;
1772 str++;
1773 }
1774 if (*cmd == '\n')
1775 cmd++;
1776 if (*str || *cmd)
1777 return 0;
1778 return 1;
1779}
1780
NeilBrown86e6ffd2005-11-08 21:39:24 -08001781struct rdev_sysfs_entry {
1782 struct attribute attr;
1783 ssize_t (*show)(mdk_rdev_t *, char *);
1784 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1785};
1786
1787static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08001788state_show(mdk_rdev_t *rdev, char *page)
NeilBrown86e6ffd2005-11-08 21:39:24 -08001789{
1790 char *sep = "";
1791 int len=0;
1792
NeilBrownb2d444d2005-11-08 21:39:31 -08001793 if (test_bit(Faulty, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08001794 len+= sprintf(page+len, "%sfaulty",sep);
1795 sep = ",";
1796 }
NeilBrownb2d444d2005-11-08 21:39:31 -08001797 if (test_bit(In_sync, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08001798 len += sprintf(page+len, "%sin_sync",sep);
1799 sep = ",";
1800 }
NeilBrownf6556752006-06-26 00:28:01 -07001801 if (test_bit(WriteMostly, &rdev->flags)) {
1802 len += sprintf(page+len, "%swrite_mostly",sep);
1803 sep = ",";
1804 }
NeilBrownb2d444d2005-11-08 21:39:31 -08001805 if (!test_bit(Faulty, &rdev->flags) &&
1806 !test_bit(In_sync, &rdev->flags)) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08001807 len += sprintf(page+len, "%sspare", sep);
1808 sep = ",";
1809 }
1810 return len+sprintf(page+len, "\n");
1811}
1812
NeilBrown45dc2de2006-06-26 00:27:58 -07001813static ssize_t
1814state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1815{
1816 /* can write
1817 * faulty - simulates and error
1818 * remove - disconnects the device
NeilBrownf6556752006-06-26 00:28:01 -07001819 * writemostly - sets write_mostly
1820 * -writemostly - clears write_mostly
NeilBrown45dc2de2006-06-26 00:27:58 -07001821 */
1822 int err = -EINVAL;
1823 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1824 md_error(rdev->mddev, rdev);
1825 err = 0;
1826 } else if (cmd_match(buf, "remove")) {
1827 if (rdev->raid_disk >= 0)
1828 err = -EBUSY;
1829 else {
1830 mddev_t *mddev = rdev->mddev;
1831 kick_rdev_from_array(rdev);
NeilBrown3f9d7b02006-12-22 01:11:41 -08001832 if (mddev->pers)
1833 md_update_sb(mddev, 1);
NeilBrown45dc2de2006-06-26 00:27:58 -07001834 md_new_event(mddev);
1835 err = 0;
1836 }
NeilBrownf6556752006-06-26 00:28:01 -07001837 } else if (cmd_match(buf, "writemostly")) {
1838 set_bit(WriteMostly, &rdev->flags);
1839 err = 0;
1840 } else if (cmd_match(buf, "-writemostly")) {
1841 clear_bit(WriteMostly, &rdev->flags);
1842 err = 0;
NeilBrown45dc2de2006-06-26 00:27:58 -07001843 }
1844 return err ? err : len;
1845}
NeilBrown80ca3a42006-07-10 04:44:18 -07001846static struct rdev_sysfs_entry rdev_state =
1847__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
NeilBrown86e6ffd2005-11-08 21:39:24 -08001848
1849static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08001850super_show(mdk_rdev_t *rdev, char *page)
NeilBrown86e6ffd2005-11-08 21:39:24 -08001851{
1852 if (rdev->sb_loaded && rdev->sb_size) {
1853 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1854 return rdev->sb_size;
1855 } else
1856 return 0;
1857}
NeilBrown96de1e62005-11-08 21:39:39 -08001858static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1859
NeilBrown4dbcdc72006-01-06 00:20:52 -08001860static ssize_t
1861errors_show(mdk_rdev_t *rdev, char *page)
1862{
1863 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1864}
1865
1866static ssize_t
1867errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1868{
1869 char *e;
1870 unsigned long n = simple_strtoul(buf, &e, 10);
1871 if (*buf && (*e == 0 || *e == '\n')) {
1872 atomic_set(&rdev->corrected_errors, n);
1873 return len;
1874 }
1875 return -EINVAL;
1876}
1877static struct rdev_sysfs_entry rdev_errors =
NeilBrown80ca3a42006-07-10 04:44:18 -07001878__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
NeilBrown4dbcdc72006-01-06 00:20:52 -08001879
NeilBrown014236d2006-01-06 00:20:55 -08001880static ssize_t
1881slot_show(mdk_rdev_t *rdev, char *page)
1882{
1883 if (rdev->raid_disk < 0)
1884 return sprintf(page, "none\n");
1885 else
1886 return sprintf(page, "%d\n", rdev->raid_disk);
1887}
1888
1889static ssize_t
1890slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1891{
1892 char *e;
1893 int slot = simple_strtoul(buf, &e, 10);
1894 if (strncmp(buf, "none", 4)==0)
1895 slot = -1;
1896 else if (e==buf || (*e && *e!= '\n'))
1897 return -EINVAL;
1898 if (rdev->mddev->pers)
1899 /* Cannot set slot in active array (yet) */
1900 return -EBUSY;
1901 if (slot >= rdev->mddev->raid_disks)
1902 return -ENOSPC;
1903 rdev->raid_disk = slot;
1904 /* assume it is working */
1905 rdev->flags = 0;
1906 set_bit(In_sync, &rdev->flags);
1907 return len;
1908}
1909
1910
1911static struct rdev_sysfs_entry rdev_slot =
NeilBrown80ca3a42006-07-10 04:44:18 -07001912__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
NeilBrown014236d2006-01-06 00:20:55 -08001913
NeilBrown93c8cad2006-01-06 00:20:56 -08001914static ssize_t
1915offset_show(mdk_rdev_t *rdev, char *page)
1916{
Andrew Morton6961ece2006-01-06 00:20:59 -08001917 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
NeilBrown93c8cad2006-01-06 00:20:56 -08001918}
1919
1920static ssize_t
1921offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1922{
1923 char *e;
1924 unsigned long long offset = simple_strtoull(buf, &e, 10);
1925 if (e==buf || (*e && *e != '\n'))
1926 return -EINVAL;
1927 if (rdev->mddev->pers)
1928 return -EBUSY;
1929 rdev->data_offset = offset;
1930 return len;
1931}
1932
1933static struct rdev_sysfs_entry rdev_offset =
NeilBrown80ca3a42006-07-10 04:44:18 -07001934__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
NeilBrown93c8cad2006-01-06 00:20:56 -08001935
NeilBrown83303b62006-01-06 00:21:06 -08001936static ssize_t
1937rdev_size_show(mdk_rdev_t *rdev, char *page)
1938{
1939 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1940}
1941
1942static ssize_t
1943rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1944{
1945 char *e;
1946 unsigned long long size = simple_strtoull(buf, &e, 10);
1947 if (e==buf || (*e && *e != '\n'))
1948 return -EINVAL;
1949 if (rdev->mddev->pers)
1950 return -EBUSY;
1951 rdev->size = size;
1952 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1953 rdev->mddev->size = size;
1954 return len;
1955}
1956
1957static struct rdev_sysfs_entry rdev_size =
NeilBrown80ca3a42006-07-10 04:44:18 -07001958__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
NeilBrown83303b62006-01-06 00:21:06 -08001959
NeilBrown86e6ffd2005-11-08 21:39:24 -08001960static struct attribute *rdev_default_attrs[] = {
1961 &rdev_state.attr,
1962 &rdev_super.attr,
NeilBrown4dbcdc72006-01-06 00:20:52 -08001963 &rdev_errors.attr,
NeilBrown014236d2006-01-06 00:20:55 -08001964 &rdev_slot.attr,
NeilBrown93c8cad2006-01-06 00:20:56 -08001965 &rdev_offset.attr,
NeilBrown83303b62006-01-06 00:21:06 -08001966 &rdev_size.attr,
NeilBrown86e6ffd2005-11-08 21:39:24 -08001967 NULL,
1968};
1969static ssize_t
1970rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1971{
1972 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1973 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1974
1975 if (!entry->show)
1976 return -EIO;
1977 return entry->show(rdev, page);
1978}
1979
1980static ssize_t
1981rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1982 const char *page, size_t length)
1983{
1984 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1985 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1986
1987 if (!entry->store)
1988 return -EIO;
NeilBrown67463ac2006-07-10 04:44:19 -07001989 if (!capable(CAP_SYS_ADMIN))
1990 return -EACCES;
NeilBrown86e6ffd2005-11-08 21:39:24 -08001991 return entry->store(rdev, page, length);
1992}
1993
1994static void rdev_free(struct kobject *ko)
1995{
1996 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1997 kfree(rdev);
1998}
1999static struct sysfs_ops rdev_sysfs_ops = {
2000 .show = rdev_attr_show,
2001 .store = rdev_attr_store,
2002};
2003static struct kobj_type rdev_ktype = {
2004 .release = rdev_free,
2005 .sysfs_ops = &rdev_sysfs_ops,
2006 .default_attrs = rdev_default_attrs,
2007};
2008
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009/*
2010 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2011 *
2012 * mark the device faulty if:
2013 *
2014 * - the device is nonexistent (zero size)
2015 * - the device has no valid superblock
2016 *
2017 * a faulty rdev _never_ has rdev->sb set.
2018 */
2019static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2020{
2021 char b[BDEVNAME_SIZE];
2022 int err;
2023 mdk_rdev_t *rdev;
2024 sector_t size;
2025
NeilBrown9ffae0c2006-01-06 00:20:32 -08002026 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027 if (!rdev) {
2028 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2029 return ERR_PTR(-ENOMEM);
2030 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031
2032 if ((err = alloc_disk_sb(rdev)))
2033 goto abort_free;
2034
2035 err = lock_rdev(rdev, newdev);
2036 if (err)
2037 goto abort_free;
2038
NeilBrown86e6ffd2005-11-08 21:39:24 -08002039 rdev->kobj.parent = NULL;
2040 rdev->kobj.ktype = &rdev_ktype;
2041 kobject_init(&rdev->kobj);
2042
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 rdev->desc_nr = -1;
NeilBrown2b6e8452006-10-28 10:38:30 -07002044 rdev->saved_raid_disk = -1;
NeilBrown3f9d7b02006-12-22 01:11:41 -08002045 rdev->raid_disk = -1;
NeilBrownb2d444d2005-11-08 21:39:31 -08002046 rdev->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047 rdev->data_offset = 0;
NeilBrown42543762006-06-26 00:27:57 -07002048 rdev->sb_events = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049 atomic_set(&rdev->nr_pending, 0);
NeilBrownba22dcb2005-11-08 21:39:31 -08002050 atomic_set(&rdev->read_errors, 0);
NeilBrown4dbcdc72006-01-06 00:20:52 -08002051 atomic_set(&rdev->corrected_errors, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052
2053 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2054 if (!size) {
2055 printk(KERN_WARNING
2056 "md: %s has zero or unknown size, marking faulty!\n",
2057 bdevname(rdev->bdev,b));
2058 err = -EINVAL;
2059 goto abort_free;
2060 }
2061
2062 if (super_format >= 0) {
2063 err = super_types[super_format].
2064 load_super(rdev, NULL, super_minor);
2065 if (err == -EINVAL) {
NeilBrowndf968c42007-07-17 04:06:11 -07002066 printk(KERN_WARNING
2067 "md: %s does not have a valid v%d.%d "
2068 "superblock, not importing!\n",
2069 bdevname(rdev->bdev,b),
2070 super_format, super_minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 goto abort_free;
2072 }
2073 if (err < 0) {
2074 printk(KERN_WARNING
2075 "md: could not read %s's sb, not importing!\n",
2076 bdevname(rdev->bdev,b));
2077 goto abort_free;
2078 }
2079 }
2080 INIT_LIST_HEAD(&rdev->same_set);
2081
2082 return rdev;
2083
2084abort_free:
2085 if (rdev->sb_page) {
2086 if (rdev->bdev)
2087 unlock_rdev(rdev);
2088 free_disk_sb(rdev);
2089 }
2090 kfree(rdev);
2091 return ERR_PTR(err);
2092}
2093
2094/*
2095 * Check a full RAID array for plausibility
2096 */
2097
2098
NeilBrowna757e642005-04-16 15:26:42 -07002099static void analyze_sbs(mddev_t * mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100{
2101 int i;
2102 struct list_head *tmp;
2103 mdk_rdev_t *rdev, *freshest;
2104 char b[BDEVNAME_SIZE];
2105
2106 freshest = NULL;
2107 ITERATE_RDEV(mddev,rdev,tmp)
2108 switch (super_types[mddev->major_version].
2109 load_super(rdev, freshest, mddev->minor_version)) {
2110 case 1:
2111 freshest = rdev;
2112 break;
2113 case 0:
2114 break;
2115 default:
2116 printk( KERN_ERR \
2117 "md: fatal superblock inconsistency in %s"
2118 " -- removing from array\n",
2119 bdevname(rdev->bdev,b));
2120 kick_rdev_from_array(rdev);
2121 }
2122
2123
2124 super_types[mddev->major_version].
2125 validate_super(mddev, freshest);
2126
2127 i = 0;
2128 ITERATE_RDEV(mddev,rdev,tmp) {
2129 if (rdev != freshest)
2130 if (super_types[mddev->major_version].
2131 validate_super(mddev, rdev)) {
2132 printk(KERN_WARNING "md: kicking non-fresh %s"
2133 " from array!\n",
2134 bdevname(rdev->bdev,b));
2135 kick_rdev_from_array(rdev);
2136 continue;
2137 }
2138 if (mddev->level == LEVEL_MULTIPATH) {
2139 rdev->desc_nr = i++;
2140 rdev->raid_disk = rdev->desc_nr;
NeilBrownb2d444d2005-11-08 21:39:31 -08002141 set_bit(In_sync, &rdev->flags);
NeilBrowna778b732007-05-23 13:58:10 -07002142 } else if (rdev->raid_disk >= mddev->raid_disks) {
2143 rdev->raid_disk = -1;
2144 clear_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 }
2146 }
2147
2148
2149
2150 if (mddev->recovery_cp != MaxSector &&
2151 mddev->level >= 1)
2152 printk(KERN_ERR "md: %s: raid array is not clean"
2153 " -- starting background reconstruction\n",
2154 mdname(mddev));
2155
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156}
2157
NeilBrowneae17012005-11-08 21:39:23 -08002158static ssize_t
NeilBrown16f17b32006-06-26 00:27:37 -07002159safe_delay_show(mddev_t *mddev, char *page)
2160{
2161 int msec = (mddev->safemode_delay*1000)/HZ;
2162 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2163}
2164static ssize_t
2165safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2166{
2167 int scale=1;
2168 int dot=0;
2169 int i;
2170 unsigned long msec;
2171 char buf[30];
2172 char *e;
2173 /* remove a period, and count digits after it */
2174 if (len >= sizeof(buf))
2175 return -EINVAL;
2176 strlcpy(buf, cbuf, len);
2177 buf[len] = 0;
2178 for (i=0; i<len; i++) {
2179 if (dot) {
2180 if (isdigit(buf[i])) {
2181 buf[i-1] = buf[i];
2182 scale *= 10;
2183 }
2184 buf[i] = 0;
2185 } else if (buf[i] == '.') {
2186 dot=1;
2187 buf[i] = 0;
2188 }
2189 }
2190 msec = simple_strtoul(buf, &e, 10);
2191 if (e == buf || (*e && *e != '\n'))
2192 return -EINVAL;
2193 msec = (msec * 1000) / scale;
2194 if (msec == 0)
2195 mddev->safemode_delay = 0;
2196 else {
2197 mddev->safemode_delay = (msec*HZ)/1000;
2198 if (mddev->safemode_delay == 0)
2199 mddev->safemode_delay = 1;
2200 }
2201 return len;
2202}
2203static struct md_sysfs_entry md_safe_delay =
NeilBrown80ca3a42006-07-10 04:44:18 -07002204__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
NeilBrown16f17b32006-06-26 00:27:37 -07002205
2206static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08002207level_show(mddev_t *mddev, char *page)
NeilBrowneae17012005-11-08 21:39:23 -08002208{
NeilBrown2604b702006-01-06 00:20:36 -08002209 struct mdk_personality *p = mddev->pers;
NeilBrownd9d166c2006-01-06 00:20:51 -08002210 if (p)
NeilBrowneae17012005-11-08 21:39:23 -08002211 return sprintf(page, "%s\n", p->name);
NeilBrownd9d166c2006-01-06 00:20:51 -08002212 else if (mddev->clevel[0])
2213 return sprintf(page, "%s\n", mddev->clevel);
2214 else if (mddev->level != LEVEL_NONE)
2215 return sprintf(page, "%d\n", mddev->level);
2216 else
2217 return 0;
NeilBrowneae17012005-11-08 21:39:23 -08002218}
2219
NeilBrownd9d166c2006-01-06 00:20:51 -08002220static ssize_t
2221level_store(mddev_t *mddev, const char *buf, size_t len)
2222{
2223 int rv = len;
2224 if (mddev->pers)
2225 return -EBUSY;
2226 if (len == 0)
2227 return 0;
2228 if (len >= sizeof(mddev->clevel))
2229 return -ENOSPC;
2230 strncpy(mddev->clevel, buf, len);
2231 if (mddev->clevel[len-1] == '\n')
2232 len--;
2233 mddev->clevel[len] = 0;
2234 mddev->level = LEVEL_NONE;
2235 return rv;
2236}
2237
2238static struct md_sysfs_entry md_level =
NeilBrown80ca3a42006-07-10 04:44:18 -07002239__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
NeilBrowneae17012005-11-08 21:39:23 -08002240
NeilBrownd4dbd022006-06-26 00:27:59 -07002241
2242static ssize_t
2243layout_show(mddev_t *mddev, char *page)
2244{
2245 /* just a number, not meaningful for all levels */
NeilBrown08a02ec2007-05-09 02:35:38 -07002246 if (mddev->reshape_position != MaxSector &&
2247 mddev->layout != mddev->new_layout)
2248 return sprintf(page, "%d (%d)\n",
2249 mddev->new_layout, mddev->layout);
NeilBrownd4dbd022006-06-26 00:27:59 -07002250 return sprintf(page, "%d\n", mddev->layout);
2251}
2252
2253static ssize_t
2254layout_store(mddev_t *mddev, const char *buf, size_t len)
2255{
2256 char *e;
2257 unsigned long n = simple_strtoul(buf, &e, 10);
NeilBrownd4dbd022006-06-26 00:27:59 -07002258
2259 if (!*buf || (*e && *e != '\n'))
2260 return -EINVAL;
2261
NeilBrown08a02ec2007-05-09 02:35:38 -07002262 if (mddev->pers)
2263 return -EBUSY;
2264 if (mddev->reshape_position != MaxSector)
2265 mddev->new_layout = n;
2266 else
2267 mddev->layout = n;
NeilBrownd4dbd022006-06-26 00:27:59 -07002268 return len;
2269}
2270static struct md_sysfs_entry md_layout =
NeilBrown80ca3a42006-07-10 04:44:18 -07002271__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
NeilBrownd4dbd022006-06-26 00:27:59 -07002272
2273
NeilBrowneae17012005-11-08 21:39:23 -08002274static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08002275raid_disks_show(mddev_t *mddev, char *page)
NeilBrowneae17012005-11-08 21:39:23 -08002276{
NeilBrownbb636542005-11-08 21:39:45 -08002277 if (mddev->raid_disks == 0)
2278 return 0;
NeilBrown08a02ec2007-05-09 02:35:38 -07002279 if (mddev->reshape_position != MaxSector &&
2280 mddev->delta_disks != 0)
2281 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2282 mddev->raid_disks - mddev->delta_disks);
NeilBrowneae17012005-11-08 21:39:23 -08002283 return sprintf(page, "%d\n", mddev->raid_disks);
2284}
2285
NeilBrownda943b992006-01-06 00:20:54 -08002286static int update_raid_disks(mddev_t *mddev, int raid_disks);
2287
2288static ssize_t
2289raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2290{
NeilBrownda943b992006-01-06 00:20:54 -08002291 char *e;
2292 int rv = 0;
2293 unsigned long n = simple_strtoul(buf, &e, 10);
2294
2295 if (!*buf || (*e && *e != '\n'))
2296 return -EINVAL;
2297
2298 if (mddev->pers)
2299 rv = update_raid_disks(mddev, n);
NeilBrown08a02ec2007-05-09 02:35:38 -07002300 else if (mddev->reshape_position != MaxSector) {
2301 int olddisks = mddev->raid_disks - mddev->delta_disks;
2302 mddev->delta_disks = n - olddisks;
2303 mddev->raid_disks = n;
2304 } else
NeilBrownda943b992006-01-06 00:20:54 -08002305 mddev->raid_disks = n;
2306 return rv ? rv : len;
2307}
2308static struct md_sysfs_entry md_raid_disks =
NeilBrown80ca3a42006-07-10 04:44:18 -07002309__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
NeilBrowneae17012005-11-08 21:39:23 -08002310
NeilBrown24dd4692005-11-08 21:39:26 -08002311static ssize_t
NeilBrown3b343802006-01-06 00:20:47 -08002312chunk_size_show(mddev_t *mddev, char *page)
2313{
NeilBrown08a02ec2007-05-09 02:35:38 -07002314 if (mddev->reshape_position != MaxSector &&
2315 mddev->chunk_size != mddev->new_chunk)
2316 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2317 mddev->chunk_size);
NeilBrown3b343802006-01-06 00:20:47 -08002318 return sprintf(page, "%d\n", mddev->chunk_size);
2319}
2320
2321static ssize_t
2322chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2323{
2324 /* can only set chunk_size if array is not yet active */
2325 char *e;
2326 unsigned long n = simple_strtoul(buf, &e, 10);
2327
NeilBrown3b343802006-01-06 00:20:47 -08002328 if (!*buf || (*e && *e != '\n'))
2329 return -EINVAL;
2330
NeilBrown08a02ec2007-05-09 02:35:38 -07002331 if (mddev->pers)
2332 return -EBUSY;
2333 else if (mddev->reshape_position != MaxSector)
2334 mddev->new_chunk = n;
2335 else
2336 mddev->chunk_size = n;
NeilBrown3b343802006-01-06 00:20:47 -08002337 return len;
2338}
2339static struct md_sysfs_entry md_chunk_size =
NeilBrown80ca3a42006-07-10 04:44:18 -07002340__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
NeilBrown3b343802006-01-06 00:20:47 -08002341
NeilBrowna94213b2006-06-26 00:28:00 -07002342static ssize_t
2343resync_start_show(mddev_t *mddev, char *page)
2344{
2345 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2346}
2347
2348static ssize_t
2349resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2350{
2351 /* can only set chunk_size if array is not yet active */
2352 char *e;
2353 unsigned long long n = simple_strtoull(buf, &e, 10);
2354
2355 if (mddev->pers)
2356 return -EBUSY;
2357 if (!*buf || (*e && *e != '\n'))
2358 return -EINVAL;
2359
2360 mddev->recovery_cp = n;
2361 return len;
2362}
2363static struct md_sysfs_entry md_resync_start =
NeilBrown80ca3a42006-07-10 04:44:18 -07002364__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
NeilBrowna94213b2006-06-26 00:28:00 -07002365
NeilBrown9e653b62006-06-26 00:27:58 -07002366/*
2367 * The array state can be:
2368 *
2369 * clear
2370 * No devices, no size, no level
2371 * Equivalent to STOP_ARRAY ioctl
2372 * inactive
2373 * May have some settings, but array is not active
2374 * all IO results in error
2375 * When written, doesn't tear down array, but just stops it
2376 * suspended (not supported yet)
2377 * All IO requests will block. The array can be reconfigured.
2378 * Writing this, if accepted, will block until array is quiessent
2379 * readonly
2380 * no resync can happen. no superblocks get written.
2381 * write requests fail
2382 * read-auto
2383 * like readonly, but behaves like 'clean' on a write request.
2384 *
2385 * clean - no pending writes, but otherwise active.
2386 * When written to inactive array, starts without resync
2387 * If a write request arrives then
2388 * if metadata is known, mark 'dirty' and switch to 'active'.
2389 * if not known, block and switch to write-pending
2390 * If written to an active array that has pending writes, then fails.
2391 * active
2392 * fully active: IO and resync can be happening.
2393 * When written to inactive array, starts with resync
2394 *
2395 * write-pending
2396 * clean, but writes are blocked waiting for 'active' to be written.
2397 *
2398 * active-idle
2399 * like active, but no writes have been seen for a while (100msec).
2400 *
2401 */
2402enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2403 write_pending, active_idle, bad_word};
Adrian Bunk05381952006-06-26 00:28:01 -07002404static char *array_states[] = {
NeilBrown9e653b62006-06-26 00:27:58 -07002405 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2406 "write-pending", "active-idle", NULL };
2407
2408static int match_word(const char *word, char **list)
2409{
2410 int n;
2411 for (n=0; list[n]; n++)
2412 if (cmd_match(word, list[n]))
2413 break;
2414 return n;
2415}
2416
2417static ssize_t
2418array_state_show(mddev_t *mddev, char *page)
2419{
2420 enum array_state st = inactive;
2421
2422 if (mddev->pers)
2423 switch(mddev->ro) {
2424 case 1:
2425 st = readonly;
2426 break;
2427 case 2:
2428 st = read_auto;
2429 break;
2430 case 0:
2431 if (mddev->in_sync)
2432 st = clean;
2433 else if (mddev->safemode)
2434 st = active_idle;
2435 else
2436 st = active;
2437 }
2438 else {
2439 if (list_empty(&mddev->disks) &&
2440 mddev->raid_disks == 0 &&
2441 mddev->size == 0)
2442 st = clear;
2443 else
2444 st = inactive;
2445 }
2446 return sprintf(page, "%s\n", array_states[st]);
2447}
2448
2449static int do_md_stop(mddev_t * mddev, int ro);
2450static int do_md_run(mddev_t * mddev);
2451static int restart_array(mddev_t *mddev);
2452
2453static ssize_t
2454array_state_store(mddev_t *mddev, const char *buf, size_t len)
2455{
2456 int err = -EINVAL;
2457 enum array_state st = match_word(buf, array_states);
2458 switch(st) {
2459 case bad_word:
2460 break;
2461 case clear:
2462 /* stopping an active array */
2463 if (mddev->pers) {
2464 if (atomic_read(&mddev->active) > 1)
2465 return -EBUSY;
2466 err = do_md_stop(mddev, 0);
2467 }
2468 break;
2469 case inactive:
2470 /* stopping an active array */
2471 if (mddev->pers) {
2472 if (atomic_read(&mddev->active) > 1)
2473 return -EBUSY;
2474 err = do_md_stop(mddev, 2);
2475 }
2476 break;
2477 case suspended:
2478 break; /* not supported yet */
2479 case readonly:
2480 if (mddev->pers)
2481 err = do_md_stop(mddev, 1);
2482 else {
2483 mddev->ro = 1;
2484 err = do_md_run(mddev);
2485 }
2486 break;
2487 case read_auto:
2488 /* stopping an active array */
2489 if (mddev->pers) {
2490 err = do_md_stop(mddev, 1);
2491 if (err == 0)
2492 mddev->ro = 2; /* FIXME mark devices writable */
2493 } else {
2494 mddev->ro = 2;
2495 err = do_md_run(mddev);
2496 }
2497 break;
2498 case clean:
2499 if (mddev->pers) {
2500 restart_array(mddev);
2501 spin_lock_irq(&mddev->write_lock);
2502 if (atomic_read(&mddev->writes_pending) == 0) {
2503 mddev->in_sync = 1;
NeilBrown850b2b42006-10-03 01:15:46 -07002504 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
NeilBrown9e653b62006-06-26 00:27:58 -07002505 }
2506 spin_unlock_irq(&mddev->write_lock);
2507 } else {
2508 mddev->ro = 0;
2509 mddev->recovery_cp = MaxSector;
2510 err = do_md_run(mddev);
2511 }
2512 break;
2513 case active:
2514 if (mddev->pers) {
2515 restart_array(mddev);
NeilBrown850b2b42006-10-03 01:15:46 -07002516 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
NeilBrown9e653b62006-06-26 00:27:58 -07002517 wake_up(&mddev->sb_wait);
2518 err = 0;
2519 } else {
2520 mddev->ro = 0;
2521 err = do_md_run(mddev);
2522 }
2523 break;
2524 case write_pending:
2525 case active_idle:
2526 /* these cannot be set */
2527 break;
2528 }
2529 if (err)
2530 return err;
2531 else
2532 return len;
2533}
NeilBrown80ca3a42006-07-10 04:44:18 -07002534static struct md_sysfs_entry md_array_state =
2535__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
NeilBrown9e653b62006-06-26 00:27:58 -07002536
NeilBrown6d7ff732006-01-06 00:21:16 -08002537static ssize_t
2538null_show(mddev_t *mddev, char *page)
2539{
2540 return -EINVAL;
2541}
2542
2543static ssize_t
2544new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2545{
2546 /* buf must be %d:%d\n? giving major and minor numbers */
2547 /* The new device is added to the array.
2548 * If the array has a persistent superblock, we read the
2549 * superblock to initialise info and check validity.
2550 * Otherwise, only checking done is that in bind_rdev_to_array,
2551 * which mainly checks size.
2552 */
2553 char *e;
2554 int major = simple_strtoul(buf, &e, 10);
2555 int minor;
2556 dev_t dev;
2557 mdk_rdev_t *rdev;
2558 int err;
2559
2560 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2561 return -EINVAL;
2562 minor = simple_strtoul(e+1, &e, 10);
2563 if (*e && *e != '\n')
2564 return -EINVAL;
2565 dev = MKDEV(major, minor);
2566 if (major != MAJOR(dev) ||
2567 minor != MINOR(dev))
2568 return -EOVERFLOW;
2569
2570
2571 if (mddev->persistent) {
2572 rdev = md_import_device(dev, mddev->major_version,
2573 mddev->minor_version);
2574 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2575 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2576 mdk_rdev_t, same_set);
2577 err = super_types[mddev->major_version]
2578 .load_super(rdev, rdev0, mddev->minor_version);
2579 if (err < 0)
2580 goto out;
2581 }
2582 } else
2583 rdev = md_import_device(dev, -1, -1);
2584
2585 if (IS_ERR(rdev))
2586 return PTR_ERR(rdev);
2587 err = bind_rdev_to_array(rdev, mddev);
2588 out:
2589 if (err)
2590 export_rdev(rdev);
2591 return err ? err : len;
2592}
2593
2594static struct md_sysfs_entry md_new_device =
NeilBrown80ca3a42006-07-10 04:44:18 -07002595__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
NeilBrown3b343802006-01-06 00:20:47 -08002596
2597static ssize_t
Paul Clements9b1d1da2006-10-03 01:15:49 -07002598bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2599{
2600 char *end;
2601 unsigned long chunk, end_chunk;
2602
2603 if (!mddev->bitmap)
2604 goto out;
2605 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2606 while (*buf) {
2607 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2608 if (buf == end) break;
2609 if (*end == '-') { /* range */
2610 buf = end + 1;
2611 end_chunk = simple_strtoul(buf, &end, 0);
2612 if (buf == end) break;
2613 }
2614 if (*end && !isspace(*end)) break;
2615 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2616 buf = end;
2617 while (isspace(*buf)) buf++;
2618 }
2619 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2620out:
2621 return len;
2622}
2623
2624static struct md_sysfs_entry md_bitmap =
2625__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2626
2627static ssize_t
NeilBrowna35b0d62006-01-06 00:20:49 -08002628size_show(mddev_t *mddev, char *page)
2629{
2630 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2631}
2632
2633static int update_size(mddev_t *mddev, unsigned long size);
2634
2635static ssize_t
2636size_store(mddev_t *mddev, const char *buf, size_t len)
2637{
2638 /* If array is inactive, we can reduce the component size, but
2639 * not increase it (except from 0).
2640 * If array is active, we can try an on-line resize
2641 */
2642 char *e;
2643 int err = 0;
2644 unsigned long long size = simple_strtoull(buf, &e, 10);
2645 if (!*buf || *buf == '\n' ||
2646 (*e && *e != '\n'))
2647 return -EINVAL;
2648
2649 if (mddev->pers) {
2650 err = update_size(mddev, size);
NeilBrown850b2b42006-10-03 01:15:46 -07002651 md_update_sb(mddev, 1);
NeilBrowna35b0d62006-01-06 00:20:49 -08002652 } else {
2653 if (mddev->size == 0 ||
2654 mddev->size > size)
2655 mddev->size = size;
2656 else
2657 err = -ENOSPC;
2658 }
2659 return err ? err : len;
2660}
2661
2662static struct md_sysfs_entry md_size =
NeilBrown80ca3a42006-07-10 04:44:18 -07002663__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
NeilBrowna35b0d62006-01-06 00:20:49 -08002664
NeilBrown8bb93aa2006-01-06 00:20:50 -08002665
2666/* Metdata version.
2667 * This is either 'none' for arrays with externally managed metadata,
2668 * or N.M for internally known formats
2669 */
2670static ssize_t
2671metadata_show(mddev_t *mddev, char *page)
2672{
2673 if (mddev->persistent)
2674 return sprintf(page, "%d.%d\n",
2675 mddev->major_version, mddev->minor_version);
2676 else
2677 return sprintf(page, "none\n");
2678}
2679
2680static ssize_t
2681metadata_store(mddev_t *mddev, const char *buf, size_t len)
2682{
2683 int major, minor;
2684 char *e;
2685 if (!list_empty(&mddev->disks))
2686 return -EBUSY;
2687
2688 if (cmd_match(buf, "none")) {
2689 mddev->persistent = 0;
2690 mddev->major_version = 0;
2691 mddev->minor_version = 90;
2692 return len;
2693 }
2694 major = simple_strtoul(buf, &e, 10);
2695 if (e==buf || *e != '.')
2696 return -EINVAL;
2697 buf = e+1;
2698 minor = simple_strtoul(buf, &e, 10);
NeilBrown3f9d7b02006-12-22 01:11:41 -08002699 if (e==buf || (*e && *e != '\n') )
NeilBrown8bb93aa2006-01-06 00:20:50 -08002700 return -EINVAL;
Ahmed S. Darwish50511da2007-05-09 02:35:34 -07002701 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
NeilBrown8bb93aa2006-01-06 00:20:50 -08002702 return -ENOENT;
2703 mddev->major_version = major;
2704 mddev->minor_version = minor;
2705 mddev->persistent = 1;
2706 return len;
2707}
2708
2709static struct md_sysfs_entry md_metadata =
NeilBrown80ca3a42006-07-10 04:44:18 -07002710__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
NeilBrown8bb93aa2006-01-06 00:20:50 -08002711
NeilBrowna35b0d62006-01-06 00:20:49 -08002712static ssize_t
NeilBrown7eec3142005-11-08 21:39:44 -08002713action_show(mddev_t *mddev, char *page)
NeilBrown24dd4692005-11-08 21:39:26 -08002714{
NeilBrown7eec3142005-11-08 21:39:44 -08002715 char *type = "idle";
NeilBrown31399d92005-11-08 21:39:29 -08002716 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2717 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
NeilBrownccfcc3c2006-03-27 01:18:09 -08002718 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2719 type = "reshape";
2720 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
NeilBrown24dd4692005-11-08 21:39:26 -08002721 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2722 type = "resync";
2723 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2724 type = "check";
2725 else
2726 type = "repair";
2727 } else
2728 type = "recover";
2729 }
2730 return sprintf(page, "%s\n", type);
2731}
2732
2733static ssize_t
NeilBrown7eec3142005-11-08 21:39:44 -08002734action_store(mddev_t *mddev, const char *page, size_t len)
NeilBrown24dd4692005-11-08 21:39:26 -08002735{
NeilBrown7eec3142005-11-08 21:39:44 -08002736 if (!mddev->pers || !mddev->pers->sync_request)
2737 return -EINVAL;
2738
NeilBrownbce74da2006-01-06 00:20:41 -08002739 if (cmd_match(page, "idle")) {
NeilBrown7eec3142005-11-08 21:39:44 -08002740 if (mddev->sync_thread) {
2741 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2742 md_unregister_thread(mddev->sync_thread);
2743 mddev->sync_thread = NULL;
2744 mddev->recovery = 0;
2745 }
NeilBrown03c902e2006-01-06 00:20:46 -08002746 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2747 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
NeilBrown24dd4692005-11-08 21:39:26 -08002748 return -EBUSY;
NeilBrown03c902e2006-01-06 00:20:46 -08002749 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
NeilBrown7eec3142005-11-08 21:39:44 -08002750 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown16484bf2006-03-27 01:18:13 -08002751 else if (cmd_match(page, "reshape")) {
2752 int err;
2753 if (mddev->pers->start_reshape == NULL)
2754 return -EINVAL;
2755 err = mddev->pers->start_reshape(mddev);
2756 if (err)
2757 return err;
2758 } else {
NeilBrownbce74da2006-01-06 00:20:41 -08002759 if (cmd_match(page, "check"))
NeilBrown7eec3142005-11-08 21:39:44 -08002760 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
NeilBrown2adc7d42006-05-20 14:59:57 -07002761 else if (!cmd_match(page, "repair"))
NeilBrown7eec3142005-11-08 21:39:44 -08002762 return -EINVAL;
2763 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2764 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
NeilBrown7eec3142005-11-08 21:39:44 -08002765 }
NeilBrown03c902e2006-01-06 00:20:46 -08002766 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown24dd4692005-11-08 21:39:26 -08002767 md_wakeup_thread(mddev->thread);
2768 return len;
2769}
2770
NeilBrown9d888832005-11-08 21:39:26 -08002771static ssize_t
NeilBrown96de1e62005-11-08 21:39:39 -08002772mismatch_cnt_show(mddev_t *mddev, char *page)
NeilBrown9d888832005-11-08 21:39:26 -08002773{
2774 return sprintf(page, "%llu\n",
2775 (unsigned long long) mddev->resync_mismatches);
2776}
2777
NeilBrown80ca3a42006-07-10 04:44:18 -07002778static struct md_sysfs_entry md_scan_mode =
2779__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
NeilBrown24dd4692005-11-08 21:39:26 -08002780
NeilBrown96de1e62005-11-08 21:39:39 -08002781
NeilBrown80ca3a42006-07-10 04:44:18 -07002782static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
NeilBrown9d888832005-11-08 21:39:26 -08002783
NeilBrown88202a02006-01-06 00:21:36 -08002784static ssize_t
2785sync_min_show(mddev_t *mddev, char *page)
2786{
2787 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2788 mddev->sync_speed_min ? "local": "system");
2789}
2790
2791static ssize_t
2792sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2793{
2794 int min;
2795 char *e;
2796 if (strncmp(buf, "system", 6)==0) {
2797 mddev->sync_speed_min = 0;
2798 return len;
2799 }
2800 min = simple_strtoul(buf, &e, 10);
2801 if (buf == e || (*e && *e != '\n') || min <= 0)
2802 return -EINVAL;
2803 mddev->sync_speed_min = min;
2804 return len;
2805}
2806
2807static struct md_sysfs_entry md_sync_min =
2808__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2809
2810static ssize_t
2811sync_max_show(mddev_t *mddev, char *page)
2812{
2813 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2814 mddev->sync_speed_max ? "local": "system");
2815}
2816
2817static ssize_t
2818sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2819{
2820 int max;
2821 char *e;
2822 if (strncmp(buf, "system", 6)==0) {
2823 mddev->sync_speed_max = 0;
2824 return len;
2825 }
2826 max = simple_strtoul(buf, &e, 10);
2827 if (buf == e || (*e && *e != '\n') || max <= 0)
2828 return -EINVAL;
2829 mddev->sync_speed_max = max;
2830 return len;
2831}
2832
2833static struct md_sysfs_entry md_sync_max =
2834__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2835
2836
2837static ssize_t
2838sync_speed_show(mddev_t *mddev, char *page)
2839{
2840 unsigned long resync, dt, db;
NeilBrownff4e8d92006-07-10 04:44:16 -07002841 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
NeilBrown88202a02006-01-06 00:21:36 -08002842 dt = ((jiffies - mddev->resync_mark) / HZ);
2843 if (!dt) dt++;
2844 db = resync - (mddev->resync_mark_cnt);
2845 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2846}
2847
NeilBrown80ca3a42006-07-10 04:44:18 -07002848static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
NeilBrown88202a02006-01-06 00:21:36 -08002849
2850static ssize_t
2851sync_completed_show(mddev_t *mddev, char *page)
2852{
2853 unsigned long max_blocks, resync;
2854
2855 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2856 max_blocks = mddev->resync_max_sectors;
2857 else
2858 max_blocks = mddev->size << 1;
2859
2860 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2861 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2862}
2863
NeilBrown80ca3a42006-07-10 04:44:18 -07002864static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
NeilBrown88202a02006-01-06 00:21:36 -08002865
NeilBrowne464eaf2006-03-27 01:18:14 -08002866static ssize_t
2867suspend_lo_show(mddev_t *mddev, char *page)
2868{
2869 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2870}
2871
2872static ssize_t
2873suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2874{
2875 char *e;
2876 unsigned long long new = simple_strtoull(buf, &e, 10);
2877
2878 if (mddev->pers->quiesce == NULL)
2879 return -EINVAL;
2880 if (buf == e || (*e && *e != '\n'))
2881 return -EINVAL;
2882 if (new >= mddev->suspend_hi ||
2883 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2884 mddev->suspend_lo = new;
2885 mddev->pers->quiesce(mddev, 2);
2886 return len;
2887 } else
2888 return -EINVAL;
2889}
2890static struct md_sysfs_entry md_suspend_lo =
2891__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2892
2893
2894static ssize_t
2895suspend_hi_show(mddev_t *mddev, char *page)
2896{
2897 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2898}
2899
2900static ssize_t
2901suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2902{
2903 char *e;
2904 unsigned long long new = simple_strtoull(buf, &e, 10);
2905
2906 if (mddev->pers->quiesce == NULL)
2907 return -EINVAL;
2908 if (buf == e || (*e && *e != '\n'))
2909 return -EINVAL;
2910 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2911 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2912 mddev->suspend_hi = new;
2913 mddev->pers->quiesce(mddev, 1);
2914 mddev->pers->quiesce(mddev, 0);
2915 return len;
2916 } else
2917 return -EINVAL;
2918}
2919static struct md_sysfs_entry md_suspend_hi =
2920__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2921
NeilBrown08a02ec2007-05-09 02:35:38 -07002922static ssize_t
2923reshape_position_show(mddev_t *mddev, char *page)
2924{
2925 if (mddev->reshape_position != MaxSector)
2926 return sprintf(page, "%llu\n",
2927 (unsigned long long)mddev->reshape_position);
2928 strcpy(page, "none\n");
2929 return 5;
2930}
2931
2932static ssize_t
2933reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
2934{
2935 char *e;
2936 unsigned long long new = simple_strtoull(buf, &e, 10);
2937 if (mddev->pers)
2938 return -EBUSY;
2939 if (buf == e || (*e && *e != '\n'))
2940 return -EINVAL;
2941 mddev->reshape_position = new;
2942 mddev->delta_disks = 0;
2943 mddev->new_level = mddev->level;
2944 mddev->new_layout = mddev->layout;
2945 mddev->new_chunk = mddev->chunk_size;
2946 return len;
2947}
2948
2949static struct md_sysfs_entry md_reshape_position =
2950__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
2951 reshape_position_store);
2952
NeilBrowne464eaf2006-03-27 01:18:14 -08002953
NeilBrowneae17012005-11-08 21:39:23 -08002954static struct attribute *md_default_attrs[] = {
2955 &md_level.attr,
NeilBrownd4dbd022006-06-26 00:27:59 -07002956 &md_layout.attr,
NeilBrowneae17012005-11-08 21:39:23 -08002957 &md_raid_disks.attr,
NeilBrown3b343802006-01-06 00:20:47 -08002958 &md_chunk_size.attr,
NeilBrowna35b0d62006-01-06 00:20:49 -08002959 &md_size.attr,
NeilBrowna94213b2006-06-26 00:28:00 -07002960 &md_resync_start.attr,
NeilBrown8bb93aa2006-01-06 00:20:50 -08002961 &md_metadata.attr,
NeilBrown6d7ff732006-01-06 00:21:16 -08002962 &md_new_device.attr,
NeilBrown16f17b32006-06-26 00:27:37 -07002963 &md_safe_delay.attr,
NeilBrown9e653b62006-06-26 00:27:58 -07002964 &md_array_state.attr,
NeilBrown08a02ec2007-05-09 02:35:38 -07002965 &md_reshape_position.attr,
NeilBrown411036f2005-11-08 21:39:40 -08002966 NULL,
2967};
2968
2969static struct attribute *md_redundancy_attrs[] = {
NeilBrown24dd4692005-11-08 21:39:26 -08002970 &md_scan_mode.attr,
NeilBrown9d888832005-11-08 21:39:26 -08002971 &md_mismatches.attr,
NeilBrown88202a02006-01-06 00:21:36 -08002972 &md_sync_min.attr,
2973 &md_sync_max.attr,
2974 &md_sync_speed.attr,
2975 &md_sync_completed.attr,
NeilBrowne464eaf2006-03-27 01:18:14 -08002976 &md_suspend_lo.attr,
2977 &md_suspend_hi.attr,
Paul Clements9b1d1da2006-10-03 01:15:49 -07002978 &md_bitmap.attr,
NeilBrowneae17012005-11-08 21:39:23 -08002979 NULL,
2980};
NeilBrown411036f2005-11-08 21:39:40 -08002981static struct attribute_group md_redundancy_group = {
2982 .name = NULL,
2983 .attrs = md_redundancy_attrs,
2984};
2985
NeilBrowneae17012005-11-08 21:39:23 -08002986
2987static ssize_t
2988md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2989{
2990 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2991 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
NeilBrown96de1e62005-11-08 21:39:39 -08002992 ssize_t rv;
NeilBrowneae17012005-11-08 21:39:23 -08002993
2994 if (!entry->show)
2995 return -EIO;
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07002996 rv = mddev_lock(mddev);
2997 if (!rv) {
2998 rv = entry->show(mddev, page);
2999 mddev_unlock(mddev);
3000 }
NeilBrown96de1e62005-11-08 21:39:39 -08003001 return rv;
NeilBrowneae17012005-11-08 21:39:23 -08003002}
3003
3004static ssize_t
3005md_attr_store(struct kobject *kobj, struct attribute *attr,
3006 const char *page, size_t length)
3007{
3008 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3009 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
NeilBrown96de1e62005-11-08 21:39:39 -08003010 ssize_t rv;
NeilBrowneae17012005-11-08 21:39:23 -08003011
3012 if (!entry->store)
3013 return -EIO;
NeilBrown67463ac2006-07-10 04:44:19 -07003014 if (!capable(CAP_SYS_ADMIN))
3015 return -EACCES;
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07003016 rv = mddev_lock(mddev);
3017 if (!rv) {
3018 rv = entry->store(mddev, page, length);
3019 mddev_unlock(mddev);
3020 }
NeilBrown96de1e62005-11-08 21:39:39 -08003021 return rv;
NeilBrowneae17012005-11-08 21:39:23 -08003022}
3023
3024static void md_free(struct kobject *ko)
3025{
3026 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3027 kfree(mddev);
3028}
3029
3030static struct sysfs_ops md_sysfs_ops = {
3031 .show = md_attr_show,
3032 .store = md_attr_store,
3033};
3034static struct kobj_type md_ktype = {
3035 .release = md_free,
3036 .sysfs_ops = &md_sysfs_ops,
3037 .default_attrs = md_default_attrs,
3038};
3039
Linus Torvalds1da177e2005-04-16 15:20:36 -07003040int mdp_major = 0;
3041
3042static struct kobject *md_probe(dev_t dev, int *part, void *data)
3043{
Arjan van de Ven48c9c272006-03-27 01:18:20 -08003044 static DEFINE_MUTEX(disks_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045 mddev_t *mddev = mddev_find(dev);
3046 struct gendisk *disk;
3047 int partitioned = (MAJOR(dev) != MD_MAJOR);
3048 int shift = partitioned ? MdpMinorShift : 0;
3049 int unit = MINOR(dev) >> shift;
3050
3051 if (!mddev)
3052 return NULL;
3053
Arjan van de Ven48c9c272006-03-27 01:18:20 -08003054 mutex_lock(&disks_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003055 if (mddev->gendisk) {
Arjan van de Ven48c9c272006-03-27 01:18:20 -08003056 mutex_unlock(&disks_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057 mddev_put(mddev);
3058 return NULL;
3059 }
3060 disk = alloc_disk(1 << shift);
3061 if (!disk) {
Arjan van de Ven48c9c272006-03-27 01:18:20 -08003062 mutex_unlock(&disks_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063 mddev_put(mddev);
3064 return NULL;
3065 }
3066 disk->major = MAJOR(dev);
3067 disk->first_minor = unit << shift;
Greg Kroah-Hartmance7b0f42005-06-20 21:15:16 -07003068 if (partitioned)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003069 sprintf(disk->disk_name, "md_d%d", unit);
Greg Kroah-Hartmance7b0f42005-06-20 21:15:16 -07003070 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071 sprintf(disk->disk_name, "md%d", unit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003072 disk->fops = &md_fops;
3073 disk->private_data = mddev;
3074 disk->queue = mddev->queue;
3075 add_disk(disk);
3076 mddev->gendisk = disk;
Arjan van de Ven48c9c272006-03-27 01:18:20 -08003077 mutex_unlock(&disks_mutex);
NeilBrown9c791972005-11-08 21:39:28 -08003078 mddev->kobj.parent = &disk->kobj;
Greg Kroah-Hartman19c38de2007-09-12 15:06:57 -07003079 kobject_set_name(&mddev->kobj, "%s", "md");
NeilBrowneae17012005-11-08 21:39:23 -08003080 mddev->kobj.ktype = &md_ktype;
NeilBrown5e55e2f2007-03-26 21:32:14 -08003081 if (kobject_register(&mddev->kobj))
3082 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3083 disk->disk_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003084 return NULL;
3085}
3086
Linus Torvalds1da177e2005-04-16 15:20:36 -07003087static void md_safemode_timeout(unsigned long data)
3088{
3089 mddev_t *mddev = (mddev_t *) data;
3090
3091 mddev->safemode = 1;
3092 md_wakeup_thread(mddev->thread);
3093}
3094
NeilBrown6ff8d8ec2006-01-06 00:20:15 -08003095static int start_dirty_degraded;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003096
3097static int do_md_run(mddev_t * mddev)
3098{
NeilBrown2604b702006-01-06 00:20:36 -08003099 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003100 int chunk_size;
3101 struct list_head *tmp;
3102 mdk_rdev_t *rdev;
3103 struct gendisk *disk;
NeilBrown2604b702006-01-06 00:20:36 -08003104 struct mdk_personality *pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105 char b[BDEVNAME_SIZE];
3106
NeilBrowna757e642005-04-16 15:26:42 -07003107 if (list_empty(&mddev->disks))
3108 /* cannot run an array with no devices.. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003109 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003110
3111 if (mddev->pers)
3112 return -EBUSY;
3113
3114 /*
3115 * Analyze all RAID superblock(s)
3116 */
NeilBrowna757e642005-04-16 15:26:42 -07003117 if (!mddev->raid_disks)
3118 analyze_sbs(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003119
3120 chunk_size = mddev->chunk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003121
NeilBrown2604b702006-01-06 00:20:36 -08003122 if (chunk_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123 if (chunk_size > MAX_CHUNK_SIZE) {
3124 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3125 chunk_size, MAX_CHUNK_SIZE);
3126 return -EINVAL;
3127 }
3128 /*
3129 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3130 */
3131 if ( (1 << ffz(~chunk_size)) != chunk_size) {
NeilBrowna757e642005-04-16 15:26:42 -07003132 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003133 return -EINVAL;
3134 }
3135 if (chunk_size < PAGE_SIZE) {
3136 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3137 chunk_size, PAGE_SIZE);
3138 return -EINVAL;
3139 }
3140
3141 /* devices must have minimum size of one chunk */
3142 ITERATE_RDEV(mddev,rdev,tmp) {
NeilBrownb2d444d2005-11-08 21:39:31 -08003143 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003144 continue;
3145 if (rdev->size < chunk_size / 1024) {
3146 printk(KERN_WARNING
3147 "md: Dev %s smaller than chunk_size:"
3148 " %lluk < %dk\n",
3149 bdevname(rdev->bdev,b),
3150 (unsigned long long)rdev->size,
3151 chunk_size / 1024);
3152 return -EINVAL;
3153 }
3154 }
3155 }
3156
Linus Torvalds1da177e2005-04-16 15:20:36 -07003157#ifdef CONFIG_KMOD
NeilBrownd9d166c2006-01-06 00:20:51 -08003158 if (mddev->level != LEVEL_NONE)
3159 request_module("md-level-%d", mddev->level);
3160 else if (mddev->clevel[0])
3161 request_module("md-%s", mddev->clevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003162#endif
3163
3164 /*
3165 * Drop all container device buffers, from now on
3166 * the only valid external interface is through the md
3167 * device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003168 */
3169 ITERATE_RDEV(mddev,rdev,tmp) {
NeilBrownb2d444d2005-11-08 21:39:31 -08003170 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003171 continue;
3172 sync_blockdev(rdev->bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -07003173 invalidate_bdev(rdev->bdev);
NeilBrownf0d76d72007-07-17 04:06:12 -07003174
3175 /* perform some consistency tests on the device.
3176 * We don't want the data to overlap the metadata,
3177 * Internal Bitmap issues has handled elsewhere.
3178 */
3179 if (rdev->data_offset < rdev->sb_offset) {
3180 if (mddev->size &&
3181 rdev->data_offset + mddev->size*2
3182 > rdev->sb_offset*2) {
3183 printk("md: %s: data overlaps metadata\n",
3184 mdname(mddev));
3185 return -EINVAL;
3186 }
3187 } else {
3188 if (rdev->sb_offset*2 + rdev->sb_size/512
3189 > rdev->data_offset) {
3190 printk("md: %s: metadata overlaps data\n",
3191 mdname(mddev));
3192 return -EINVAL;
3193 }
3194 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003195 }
3196
3197 md_probe(mddev->unit, NULL, NULL);
3198 disk = mddev->gendisk;
3199 if (!disk)
3200 return -ENOMEM;
3201
3202 spin_lock(&pers_lock);
NeilBrownd9d166c2006-01-06 00:20:51 -08003203 pers = find_pers(mddev->level, mddev->clevel);
NeilBrown2604b702006-01-06 00:20:36 -08003204 if (!pers || !try_module_get(pers->owner)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003205 spin_unlock(&pers_lock);
NeilBrownd9d166c2006-01-06 00:20:51 -08003206 if (mddev->level != LEVEL_NONE)
3207 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3208 mddev->level);
3209 else
3210 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3211 mddev->clevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003212 return -EINVAL;
3213 }
NeilBrown2604b702006-01-06 00:20:36 -08003214 mddev->pers = pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003215 spin_unlock(&pers_lock);
NeilBrownd9d166c2006-01-06 00:20:51 -08003216 mddev->level = pers->level;
3217 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003218
NeilBrownf6705572006-03-27 01:18:11 -08003219 if (mddev->reshape_position != MaxSector &&
NeilBrown63c70c42006-03-27 01:18:13 -08003220 pers->start_reshape == NULL) {
NeilBrownf6705572006-03-27 01:18:11 -08003221 /* This personality cannot handle reshaping... */
3222 mddev->pers = NULL;
3223 module_put(pers->owner);
3224 return -EINVAL;
3225 }
3226
NeilBrown7dd5e7c32007-02-28 20:11:35 -08003227 if (pers->sync_request) {
3228 /* Warn if this is a potentially silly
3229 * configuration.
3230 */
3231 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3232 mdk_rdev_t *rdev2;
3233 struct list_head *tmp2;
3234 int warned = 0;
3235 ITERATE_RDEV(mddev, rdev, tmp) {
3236 ITERATE_RDEV(mddev, rdev2, tmp2) {
3237 if (rdev < rdev2 &&
3238 rdev->bdev->bd_contains ==
3239 rdev2->bdev->bd_contains) {
3240 printk(KERN_WARNING
3241 "%s: WARNING: %s appears to be"
3242 " on the same physical disk as"
3243 " %s.\n",
3244 mdname(mddev),
3245 bdevname(rdev->bdev,b),
3246 bdevname(rdev2->bdev,b2));
3247 warned = 1;
3248 }
3249 }
3250 }
3251 if (warned)
3252 printk(KERN_WARNING
3253 "True protection against single-disk"
3254 " failure might be compromised.\n");
3255 }
3256
NeilBrown657390d2005-08-26 18:34:16 -07003257 mddev->recovery = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003258 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
NeilBrowna9701a32005-11-08 21:39:34 -08003259 mddev->barriers_work = 1;
NeilBrown6ff8d8ec2006-01-06 00:20:15 -08003260 mddev->ok_start_degraded = start_dirty_degraded;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003261
NeilBrownf91de922005-11-08 21:39:36 -08003262 if (start_readonly)
3263 mddev->ro = 2; /* read-only, but switch on first write */
3264
NeilBrownb15c2e52006-01-06 00:20:16 -08003265 err = mddev->pers->run(mddev);
3266 if (!err && mddev->pers->sync_request) {
3267 err = bitmap_create(mddev);
3268 if (err) {
3269 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3270 mdname(mddev), err);
3271 mddev->pers->stop(mddev);
3272 }
3273 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003274 if (err) {
3275 printk(KERN_ERR "md: pers->run() failed ...\n");
3276 module_put(mddev->pers->owner);
3277 mddev->pers = NULL;
NeilBrown32a76272005-06-21 17:17:14 -07003278 bitmap_destroy(mddev);
3279 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003280 }
NeilBrown5e55e2f2007-03-26 21:32:14 -08003281 if (mddev->pers->sync_request) {
3282 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3283 printk(KERN_WARNING
3284 "md: cannot register extra attributes for %s\n",
3285 mdname(mddev));
3286 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
NeilBrownfd9d49c2005-11-08 21:39:42 -08003287 mddev->ro = 0;
3288
Linus Torvalds1da177e2005-04-16 15:20:36 -07003289 atomic_set(&mddev->writes_pending,0);
3290 mddev->safemode = 0;
3291 mddev->safemode_timer.function = md_safemode_timeout;
3292 mddev->safemode_timer.data = (unsigned long) mddev;
NeilBrown16f17b32006-06-26 00:27:37 -07003293 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003294 mddev->in_sync = 1;
NeilBrown86e6ffd2005-11-08 21:39:24 -08003295
3296 ITERATE_RDEV(mddev,rdev,tmp)
3297 if (rdev->raid_disk >= 0) {
3298 char nm[20];
3299 sprintf(nm, "rd%d", rdev->raid_disk);
NeilBrown5e55e2f2007-03-26 21:32:14 -08003300 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3301 printk("md: cannot register %s for %s\n",
3302 nm, mdname(mddev));
NeilBrown86e6ffd2005-11-08 21:39:24 -08003303 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003304
3305 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3306
NeilBrown850b2b42006-10-03 01:15:46 -07003307 if (mddev->flags)
3308 md_update_sb(mddev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003309
3310 set_capacity(disk, mddev->array_size<<1);
3311
3312 /* If we call blk_queue_make_request here, it will
3313 * re-initialise max_sectors etc which may have been
3314 * refined inside -> run. So just set the bits we need to set.
3315 * Most initialisation happended when we called
3316 * blk_queue_make_request(..., md_fail_request)
3317 * earlier.
3318 */
3319 mddev->queue->queuedata = mddev;
3320 mddev->queue->make_request_fn = mddev->pers->make_request;
3321
NeilBrown5fd6c1d2006-06-26 00:27:40 -07003322 /* If there is a partially-recovered drive we need to
3323 * start recovery here. If we leave it to md_check_recovery,
3324 * it will remove the drives and not do the right thing
3325 */
NeilBrown0b8c9de2006-07-10 04:44:15 -07003326 if (mddev->degraded && !mddev->sync_thread) {
NeilBrown5fd6c1d2006-06-26 00:27:40 -07003327 struct list_head *rtmp;
3328 int spares = 0;
3329 ITERATE_RDEV(mddev,rdev,rtmp)
3330 if (rdev->raid_disk >= 0 &&
3331 !test_bit(In_sync, &rdev->flags) &&
3332 !test_bit(Faulty, &rdev->flags))
3333 /* complete an interrupted recovery */
3334 spares++;
3335 if (spares && mddev->pers->sync_request) {
3336 mddev->recovery = 0;
3337 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3338 mddev->sync_thread = md_register_thread(md_do_sync,
3339 mddev,
3340 "%s_resync");
3341 if (!mddev->sync_thread) {
3342 printk(KERN_ERR "%s: could not start resync"
3343 " thread...\n",
3344 mdname(mddev));
3345 /* leave the spares where they are, it shouldn't hurt */
3346 mddev->recovery = 0;
NeilBrown0b8c9de2006-07-10 04:44:15 -07003347 }
NeilBrown5fd6c1d2006-06-26 00:27:40 -07003348 }
3349 }
NeilBrown0b8c9de2006-07-10 04:44:15 -07003350 md_wakeup_thread(mddev->thread);
3351 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
NeilBrown5fd6c1d2006-06-26 00:27:40 -07003352
Linus Torvalds44ce6292007-05-09 18:51:36 -07003353 mddev->changed = 1;
NeilBrownd7603b72006-01-06 00:20:30 -08003354 md_new_event(mddev);
NeilBrown2f471302006-11-08 17:44:47 -08003355 kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003356 return 0;
3357}
3358
3359static int restart_array(mddev_t *mddev)
3360{
3361 struct gendisk *disk = mddev->gendisk;
3362 int err;
3363
3364 /*
3365 * Complain if it has no devices
3366 */
3367 err = -ENXIO;
3368 if (list_empty(&mddev->disks))
3369 goto out;
3370
3371 if (mddev->pers) {
3372 err = -EBUSY;
3373 if (!mddev->ro)
3374 goto out;
3375
3376 mddev->safemode = 0;
3377 mddev->ro = 0;
3378 set_disk_ro(disk, 0);
3379
3380 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3381 mdname(mddev));
3382 /*
3383 * Kick recovery or resync if necessary
3384 */
3385 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3386 md_wakeup_thread(mddev->thread);
NeilBrown5fd6c1d2006-06-26 00:27:40 -07003387 md_wakeup_thread(mddev->sync_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003388 err = 0;
NeilBrown9e653b62006-06-26 00:27:58 -07003389 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003390 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003391
3392out:
3393 return err;
3394}
3395
NeilBrownacc55e22006-06-26 00:27:47 -07003396/* similar to deny_write_access, but accounts for our holding a reference
3397 * to the file ourselves */
3398static int deny_bitmap_write_access(struct file * file)
3399{
3400 struct inode *inode = file->f_mapping->host;
3401
3402 spin_lock(&inode->i_lock);
3403 if (atomic_read(&inode->i_writecount) > 1) {
3404 spin_unlock(&inode->i_lock);
3405 return -ETXTBSY;
3406 }
3407 atomic_set(&inode->i_writecount, -1);
3408 spin_unlock(&inode->i_lock);
3409
3410 return 0;
3411}
3412
3413static void restore_bitmap_write_access(struct file *file)
3414{
3415 struct inode *inode = file->f_mapping->host;
3416
3417 spin_lock(&inode->i_lock);
3418 atomic_set(&inode->i_writecount, 1);
3419 spin_unlock(&inode->i_lock);
3420}
3421
NeilBrown9e653b62006-06-26 00:27:58 -07003422/* mode:
3423 * 0 - completely stop and dis-assemble array
3424 * 1 - switch to readonly
3425 * 2 - stop but do not disassemble array
3426 */
3427static int do_md_stop(mddev_t * mddev, int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003428{
3429 int err = 0;
3430 struct gendisk *disk = mddev->gendisk;
3431
3432 if (mddev->pers) {
3433 if (atomic_read(&mddev->active)>2) {
3434 printk("md: %s still in use.\n",mdname(mddev));
3435 return -EBUSY;
3436 }
3437
3438 if (mddev->sync_thread) {
NeilBrown5fd6c1d2006-06-26 00:27:40 -07003439 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003440 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3441 md_unregister_thread(mddev->sync_thread);
3442 mddev->sync_thread = NULL;
3443 }
3444
3445 del_timer_sync(&mddev->safemode_timer);
3446
3447 invalidate_partition(disk, 0);
3448
NeilBrown9e653b62006-06-26 00:27:58 -07003449 switch(mode) {
3450 case 1: /* readonly */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003451 err = -ENXIO;
NeilBrownf91de922005-11-08 21:39:36 -08003452 if (mddev->ro==1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003453 goto out;
3454 mddev->ro = 1;
NeilBrown9e653b62006-06-26 00:27:58 -07003455 break;
3456 case 0: /* disassemble */
3457 case 2: /* stop */
NeilBrown6b8b3e82005-08-04 12:53:35 -07003458 bitmap_flush(mddev);
NeilBrowna9701a32005-11-08 21:39:34 -08003459 md_super_wait(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003460 if (mddev->ro)
3461 set_disk_ro(disk, 0);
3462 blk_queue_make_request(mddev->queue, md_fail_request);
3463 mddev->pers->stop(mddev);
NeilBrownd1b53802007-02-28 20:11:42 -08003464 mddev->queue->merge_bvec_fn = NULL;
3465 mddev->queue->unplug_fn = NULL;
3466 mddev->queue->issue_flush_fn = NULL;
NeilBrown041ae522007-03-26 21:32:14 -08003467 mddev->queue->backing_dev_info.congested_fn = NULL;
NeilBrown411036f2005-11-08 21:39:40 -08003468 if (mddev->pers->sync_request)
3469 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3470
Linus Torvalds1da177e2005-04-16 15:20:36 -07003471 module_put(mddev->pers->owner);
3472 mddev->pers = NULL;
NeilBrown0d4ca602006-12-10 02:20:44 -08003473
3474 set_capacity(disk, 0);
Linus Torvalds44ce6292007-05-09 18:51:36 -07003475 mddev->changed = 1;
NeilBrown0d4ca602006-12-10 02:20:44 -08003476
Linus Torvalds1da177e2005-04-16 15:20:36 -07003477 if (mddev->ro)
3478 mddev->ro = 0;
3479 }
NeilBrown850b2b42006-10-03 01:15:46 -07003480 if (!mddev->in_sync || mddev->flags) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003481 /* mark array as shutdown cleanly */
3482 mddev->in_sync = 1;
NeilBrown850b2b42006-10-03 01:15:46 -07003483 md_update_sb(mddev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003484 }
NeilBrown9e653b62006-06-26 00:27:58 -07003485 if (mode == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003486 set_disk_ro(disk, 1);
NeilBrown5fd6c1d2006-06-26 00:27:40 -07003487 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003488 }
NeilBrown32a76272005-06-21 17:17:14 -07003489
Linus Torvalds1da177e2005-04-16 15:20:36 -07003490 /*
3491 * Free resources if final stop
3492 */
NeilBrown9e653b62006-06-26 00:27:58 -07003493 if (mode == 0) {
NeilBrown86e6ffd2005-11-08 21:39:24 -08003494 mdk_rdev_t *rdev;
3495 struct list_head *tmp;
NeilBrown0d4ca602006-12-10 02:20:44 -08003496
Linus Torvalds1da177e2005-04-16 15:20:36 -07003497 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3498
NeilBrown978f9462006-02-02 14:28:05 -08003499 bitmap_destroy(mddev);
3500 if (mddev->bitmap_file) {
NeilBrownacc55e22006-06-26 00:27:47 -07003501 restore_bitmap_write_access(mddev->bitmap_file);
NeilBrown978f9462006-02-02 14:28:05 -08003502 fput(mddev->bitmap_file);
3503 mddev->bitmap_file = NULL;
3504 }
3505 mddev->bitmap_offset = 0;
3506
NeilBrown86e6ffd2005-11-08 21:39:24 -08003507 ITERATE_RDEV(mddev,rdev,tmp)
3508 if (rdev->raid_disk >= 0) {
3509 char nm[20];
3510 sprintf(nm, "rd%d", rdev->raid_disk);
3511 sysfs_remove_link(&mddev->kobj, nm);
3512 }
3513
NeilBrown5792a282007-04-04 19:08:18 -07003514 /* make sure all delayed_delete calls have finished */
3515 flush_scheduled_work();
3516
Linus Torvalds1da177e2005-04-16 15:20:36 -07003517 export_array(mddev);
3518
3519 mddev->array_size = 0;
NeilBrown9e653b62006-06-26 00:27:58 -07003520 mddev->size = 0;
3521 mddev->raid_disks = 0;
NeilBrowna94213b2006-06-26 00:28:00 -07003522 mddev->recovery_cp = 0;
NeilBrown08a02ec2007-05-09 02:35:38 -07003523 mddev->reshape_position = MaxSector;
NeilBrown9e653b62006-06-26 00:27:58 -07003524
NeilBrowna8a55c32006-06-26 00:27:39 -07003525 } else if (mddev->pers)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003526 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3527 mdname(mddev));
3528 err = 0;
NeilBrownd7603b72006-01-06 00:20:30 -08003529 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003530out:
3531 return err;
3532}
3533
Jeff Garzikfdee8ae2006-12-10 02:20:50 -08003534#ifndef MODULE
Linus Torvalds1da177e2005-04-16 15:20:36 -07003535static void autorun_array(mddev_t *mddev)
3536{
3537 mdk_rdev_t *rdev;
3538 struct list_head *tmp;
3539 int err;
3540
NeilBrowna757e642005-04-16 15:26:42 -07003541 if (list_empty(&mddev->disks))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003542 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003543
3544 printk(KERN_INFO "md: running: ");
3545
3546 ITERATE_RDEV(mddev,rdev,tmp) {
3547 char b[BDEVNAME_SIZE];
3548 printk("<%s>", bdevname(rdev->bdev,b));
3549 }
3550 printk("\n");
3551
3552 err = do_md_run (mddev);
3553 if (err) {
3554 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3555 do_md_stop (mddev, 0);
3556 }
3557}
3558
3559/*
3560 * lets try to run arrays based on all disks that have arrived
3561 * until now. (those are in pending_raid_disks)
3562 *
3563 * the method: pick the first pending disk, collect all disks with
3564 * the same UUID, remove all from the pending list and put them into
3565 * the 'same_array' list. Then order this list based on superblock
3566 * update time (freshest comes first), kick out 'old' disks and
3567 * compare superblocks. If everything's fine then run it.
3568 *
3569 * If "unit" is allocated, then bump its reference count
3570 */
3571static void autorun_devices(int part)
3572{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003573 struct list_head *tmp;
3574 mdk_rdev_t *rdev0, *rdev;
3575 mddev_t *mddev;
3576 char b[BDEVNAME_SIZE];
3577
3578 printk(KERN_INFO "md: autorun ...\n");
3579 while (!list_empty(&pending_raid_disks)) {
NeilBrowne8703fe2006-10-03 01:15:59 -07003580 int unit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003581 dev_t dev;
NeilBrownad01c9e2006-03-27 01:18:07 -08003582 LIST_HEAD(candidates);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003583 rdev0 = list_entry(pending_raid_disks.next,
3584 mdk_rdev_t, same_set);
3585
3586 printk(KERN_INFO "md: considering %s ...\n",
3587 bdevname(rdev0->bdev,b));
3588 INIT_LIST_HEAD(&candidates);
3589 ITERATE_RDEV_PENDING(rdev,tmp)
3590 if (super_90_load(rdev, rdev0, 0) >= 0) {
3591 printk(KERN_INFO "md: adding %s ...\n",
3592 bdevname(rdev->bdev,b));
3593 list_move(&rdev->same_set, &candidates);
3594 }
3595 /*
3596 * now we have a set of devices, with all of them having
3597 * mostly sane superblocks. It's time to allocate the
3598 * mddev.
3599 */
NeilBrowne8703fe2006-10-03 01:15:59 -07003600 if (part) {
3601 dev = MKDEV(mdp_major,
3602 rdev0->preferred_minor << MdpMinorShift);
3603 unit = MINOR(dev) >> MdpMinorShift;
3604 } else {
3605 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3606 unit = MINOR(dev);
3607 }
3608 if (rdev0->preferred_minor != unit) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003609 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3610 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3611 break;
3612 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003613
3614 md_probe(dev, NULL, NULL);
3615 mddev = mddev_find(dev);
3616 if (!mddev) {
3617 printk(KERN_ERR
3618 "md: cannot allocate memory for md drive.\n");
3619 break;
3620 }
3621 if (mddev_lock(mddev))
3622 printk(KERN_WARNING "md: %s locked, cannot run\n",
3623 mdname(mddev));
3624 else if (mddev->raid_disks || mddev->major_version
3625 || !list_empty(&mddev->disks)) {
3626 printk(KERN_WARNING
3627 "md: %s already running, cannot run %s\n",
3628 mdname(mddev), bdevname(rdev0->bdev,b));
3629 mddev_unlock(mddev);
3630 } else {
3631 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3632 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3633 list_del_init(&rdev->same_set);
3634 if (bind_rdev_to_array(rdev, mddev))
3635 export_rdev(rdev);
3636 }
3637 autorun_array(mddev);
3638 mddev_unlock(mddev);
3639 }
3640 /* on success, candidates will be empty, on error
3641 * it won't...
3642 */
3643 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3644 export_rdev(rdev);
3645 mddev_put(mddev);
3646 }
3647 printk(KERN_INFO "md: ... autorun DONE.\n");
3648}
Jeff Garzikfdee8ae2006-12-10 02:20:50 -08003649#endif /* !MODULE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003650
Linus Torvalds1da177e2005-04-16 15:20:36 -07003651static int get_version(void __user * arg)
3652{
3653 mdu_version_t ver;
3654
3655 ver.major = MD_MAJOR_VERSION;
3656 ver.minor = MD_MINOR_VERSION;
3657 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3658
3659 if (copy_to_user(arg, &ver, sizeof(ver)))
3660 return -EFAULT;
3661
3662 return 0;
3663}
3664
3665static int get_array_info(mddev_t * mddev, void __user * arg)
3666{
3667 mdu_array_info_t info;
3668 int nr,working,active,failed,spare;
3669 mdk_rdev_t *rdev;
3670 struct list_head *tmp;
3671
3672 nr=working=active=failed=spare=0;
3673 ITERATE_RDEV(mddev,rdev,tmp) {
3674 nr++;
NeilBrownb2d444d2005-11-08 21:39:31 -08003675 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003676 failed++;
3677 else {
3678 working++;
NeilBrownb2d444d2005-11-08 21:39:31 -08003679 if (test_bit(In_sync, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003680 active++;
3681 else
3682 spare++;
3683 }
3684 }
3685
3686 info.major_version = mddev->major_version;
3687 info.minor_version = mddev->minor_version;
3688 info.patch_version = MD_PATCHLEVEL_VERSION;
3689 info.ctime = mddev->ctime;
3690 info.level = mddev->level;
3691 info.size = mddev->size;
NeilBrown284ae7c2006-02-03 03:03:40 -08003692 if (info.size != mddev->size) /* overflow */
3693 info.size = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003694 info.nr_disks = nr;
3695 info.raid_disks = mddev->raid_disks;
3696 info.md_minor = mddev->md_minor;
3697 info.not_persistent= !mddev->persistent;
3698
3699 info.utime = mddev->utime;
3700 info.state = 0;
3701 if (mddev->in_sync)
3702 info.state = (1<<MD_SB_CLEAN);
NeilBrown36fa3062005-09-09 16:23:45 -07003703 if (mddev->bitmap && mddev->bitmap_offset)
3704 info.state = (1<<MD_SB_BITMAP_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003705 info.active_disks = active;
3706 info.working_disks = working;
3707 info.failed_disks = failed;
3708 info.spare_disks = spare;
3709
3710 info.layout = mddev->layout;
3711 info.chunk_size = mddev->chunk_size;
3712
3713 if (copy_to_user(arg, &info, sizeof(info)))
3714 return -EFAULT;
3715
3716 return 0;
3717}
3718
viro@ZenIV.linux.org.uk87162a22005-09-09 20:36:43 +01003719static int get_bitmap_file(mddev_t * mddev, void __user * arg)
NeilBrown32a76272005-06-21 17:17:14 -07003720{
3721 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3722 char *ptr, *buf = NULL;
3723 int err = -ENOMEM;
3724
NeilBrown2a2275d2007-01-26 00:57:11 -08003725 md_allow_write(mddev);
3726
NeilBrown32a76272005-06-21 17:17:14 -07003727 file = kmalloc(sizeof(*file), GFP_KERNEL);
3728 if (!file)
3729 goto out;
3730
3731 /* bitmap disabled, zero the first byte and copy out */
3732 if (!mddev->bitmap || !mddev->bitmap->file) {
3733 file->pathname[0] = '\0';
3734 goto copy_out;
3735 }
3736
3737 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3738 if (!buf)
3739 goto out;
3740
3741 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3742 if (!ptr)
3743 goto out;
3744
3745 strcpy(file->pathname, ptr);
3746
3747copy_out:
3748 err = 0;
3749 if (copy_to_user(arg, file, sizeof(*file)))
3750 err = -EFAULT;
3751out:
3752 kfree(buf);
3753 kfree(file);
3754 return err;
3755}
3756
Linus Torvalds1da177e2005-04-16 15:20:36 -07003757static int get_disk_info(mddev_t * mddev, void __user * arg)
3758{
3759 mdu_disk_info_t info;
3760 unsigned int nr;
3761 mdk_rdev_t *rdev;
3762
3763 if (copy_from_user(&info, arg, sizeof(info)))
3764 return -EFAULT;
3765
3766 nr = info.number;
3767
3768 rdev = find_rdev_nr(mddev, nr);
3769 if (rdev) {
3770 info.major = MAJOR(rdev->bdev->bd_dev);
3771 info.minor = MINOR(rdev->bdev->bd_dev);
3772 info.raid_disk = rdev->raid_disk;
3773 info.state = 0;
NeilBrownb2d444d2005-11-08 21:39:31 -08003774 if (test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003775 info.state |= (1<<MD_DISK_FAULTY);
NeilBrownb2d444d2005-11-08 21:39:31 -08003776 else if (test_bit(In_sync, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003777 info.state |= (1<<MD_DISK_ACTIVE);
3778 info.state |= (1<<MD_DISK_SYNC);
3779 }
NeilBrown8ddf9ef2005-09-09 16:23:45 -07003780 if (test_bit(WriteMostly, &rdev->flags))
3781 info.state |= (1<<MD_DISK_WRITEMOSTLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003782 } else {
3783 info.major = info.minor = 0;
3784 info.raid_disk = -1;
3785 info.state = (1<<MD_DISK_REMOVED);
3786 }
3787
3788 if (copy_to_user(arg, &info, sizeof(info)))
3789 return -EFAULT;
3790
3791 return 0;
3792}
3793
3794static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3795{
3796 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3797 mdk_rdev_t *rdev;
3798 dev_t dev = MKDEV(info->major,info->minor);
3799
3800 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3801 return -EOVERFLOW;
3802
3803 if (!mddev->raid_disks) {
3804 int err;
3805 /* expecting a device which has a superblock */
3806 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3807 if (IS_ERR(rdev)) {
3808 printk(KERN_WARNING
3809 "md: md_import_device returned %ld\n",
3810 PTR_ERR(rdev));
3811 return PTR_ERR(rdev);
3812 }
3813 if (!list_empty(&mddev->disks)) {
3814 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3815 mdk_rdev_t, same_set);
3816 int err = super_types[mddev->major_version]
3817 .load_super(rdev, rdev0, mddev->minor_version);
3818 if (err < 0) {
3819 printk(KERN_WARNING
3820 "md: %s has different UUID to %s\n",
3821 bdevname(rdev->bdev,b),
3822 bdevname(rdev0->bdev,b2));
3823 export_rdev(rdev);
3824 return -EINVAL;
3825 }
3826 }
3827 err = bind_rdev_to_array(rdev, mddev);
3828 if (err)
3829 export_rdev(rdev);
3830 return err;
3831 }
3832
3833 /*
3834 * add_new_disk can be used once the array is assembled
3835 * to add "hot spares". They must already have a superblock
3836 * written
3837 */
3838 if (mddev->pers) {
3839 int err;
3840 if (!mddev->pers->hot_add_disk) {
3841 printk(KERN_WARNING
3842 "%s: personality does not support diskops!\n",
3843 mdname(mddev));
3844 return -EINVAL;
3845 }
NeilBrown7b1e35f2005-09-09 16:23:50 -07003846 if (mddev->persistent)
3847 rdev = md_import_device(dev, mddev->major_version,
3848 mddev->minor_version);
3849 else
3850 rdev = md_import_device(dev, -1, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003851 if (IS_ERR(rdev)) {
3852 printk(KERN_WARNING
3853 "md: md_import_device returned %ld\n",
3854 PTR_ERR(rdev));
3855 return PTR_ERR(rdev);
3856 }
NeilBrown41158c72005-06-21 17:17:25 -07003857 /* set save_raid_disk if appropriate */
3858 if (!mddev->persistent) {
3859 if (info->state & (1<<MD_DISK_SYNC) &&
3860 info->raid_disk < mddev->raid_disks)
3861 rdev->raid_disk = info->raid_disk;
3862 else
3863 rdev->raid_disk = -1;
3864 } else
3865 super_types[mddev->major_version].
3866 validate_super(mddev, rdev);
3867 rdev->saved_raid_disk = rdev->raid_disk;
3868
NeilBrownb2d444d2005-11-08 21:39:31 -08003869 clear_bit(In_sync, &rdev->flags); /* just to be sure */
NeilBrown8ddf9ef2005-09-09 16:23:45 -07003870 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3871 set_bit(WriteMostly, &rdev->flags);
3872
Linus Torvalds1da177e2005-04-16 15:20:36 -07003873 rdev->raid_disk = -1;
3874 err = bind_rdev_to_array(rdev, mddev);
NeilBrown7c7546c2006-06-26 00:27:41 -07003875 if (!err && !mddev->pers->hot_remove_disk) {
3876 /* If there is hot_add_disk but no hot_remove_disk
3877 * then added disks for geometry changes,
3878 * and should be added immediately.
3879 */
3880 super_types[mddev->major_version].
3881 validate_super(mddev, rdev);
3882 err = mddev->pers->hot_add_disk(mddev, rdev);
3883 if (err)
3884 unbind_rdev_from_array(rdev);
3885 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003886 if (err)
3887 export_rdev(rdev);
NeilBrownc3617772005-06-21 17:17:10 -07003888
NeilBrown17571282006-12-10 02:20:52 -08003889 md_update_sb(mddev, 1);
NeilBrownc3617772005-06-21 17:17:10 -07003890 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrown005eca52005-08-22 13:11:08 -07003891 md_wakeup_thread(mddev->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003892 return err;
3893 }
3894
3895 /* otherwise, add_new_disk is only allowed
3896 * for major_version==0 superblocks
3897 */
3898 if (mddev->major_version != 0) {
3899 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3900 mdname(mddev));
3901 return -EINVAL;
3902 }
3903
3904 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3905 int err;
3906 rdev = md_import_device (dev, -1, 0);
3907 if (IS_ERR(rdev)) {
3908 printk(KERN_WARNING
3909 "md: error, md_import_device() returned %ld\n",
3910 PTR_ERR(rdev));
3911 return PTR_ERR(rdev);
3912 }
3913 rdev->desc_nr = info->number;
3914 if (info->raid_disk < mddev->raid_disks)
3915 rdev->raid_disk = info->raid_disk;
3916 else
3917 rdev->raid_disk = -1;
3918
NeilBrownb2d444d2005-11-08 21:39:31 -08003919 rdev->flags = 0;
3920
Linus Torvalds1da177e2005-04-16 15:20:36 -07003921 if (rdev->raid_disk < mddev->raid_disks)
NeilBrownb2d444d2005-11-08 21:39:31 -08003922 if (info->state & (1<<MD_DISK_SYNC))
3923 set_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003924
NeilBrown8ddf9ef2005-09-09 16:23:45 -07003925 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3926 set_bit(WriteMostly, &rdev->flags);
3927
Linus Torvalds1da177e2005-04-16 15:20:36 -07003928 if (!mddev->persistent) {
3929 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3930 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3931 } else
3932 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3933 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3934
NeilBrown2bf071b2006-01-06 00:20:55 -08003935 err = bind_rdev_to_array(rdev, mddev);
3936 if (err) {
3937 export_rdev(rdev);
3938 return err;
3939 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003940 }
3941
3942 return 0;
3943}
3944
3945static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3946{
3947 char b[BDEVNAME_SIZE];
3948 mdk_rdev_t *rdev;
3949
3950 if (!mddev->pers)
3951 return -ENODEV;
3952
3953 rdev = find_rdev(mddev, dev);
3954 if (!rdev)
3955 return -ENXIO;
3956
3957 if (rdev->raid_disk >= 0)
3958 goto busy;
3959
3960 kick_rdev_from_array(rdev);
NeilBrown850b2b42006-10-03 01:15:46 -07003961 md_update_sb(mddev, 1);
NeilBrownd7603b72006-01-06 00:20:30 -08003962 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003963
3964 return 0;
3965busy:
3966 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3967 bdevname(rdev->bdev,b), mdname(mddev));
3968 return -EBUSY;
3969}
3970
3971static int hot_add_disk(mddev_t * mddev, dev_t dev)
3972{
3973 char b[BDEVNAME_SIZE];
3974 int err;
3975 unsigned int size;
3976 mdk_rdev_t *rdev;
3977
3978 if (!mddev->pers)
3979 return -ENODEV;
3980
3981 if (mddev->major_version != 0) {
3982 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3983 " version-0 superblocks.\n",
3984 mdname(mddev));
3985 return -EINVAL;
3986 }
3987 if (!mddev->pers->hot_add_disk) {
3988 printk(KERN_WARNING
3989 "%s: personality does not support diskops!\n",
3990 mdname(mddev));
3991 return -EINVAL;
3992 }
3993
3994 rdev = md_import_device (dev, -1, 0);
3995 if (IS_ERR(rdev)) {
3996 printk(KERN_WARNING
3997 "md: error, md_import_device() returned %ld\n",
3998 PTR_ERR(rdev));
3999 return -EINVAL;
4000 }
4001
4002 if (mddev->persistent)
4003 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4004 else
4005 rdev->sb_offset =
4006 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4007
4008 size = calc_dev_size(rdev, mddev->chunk_size);
4009 rdev->size = size;
4010
NeilBrownb2d444d2005-11-08 21:39:31 -08004011 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004012 printk(KERN_WARNING
4013 "md: can not hot-add faulty %s disk to %s!\n",
4014 bdevname(rdev->bdev,b), mdname(mddev));
4015 err = -EINVAL;
4016 goto abort_export;
4017 }
NeilBrownb2d444d2005-11-08 21:39:31 -08004018 clear_bit(In_sync, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004019 rdev->desc_nr = -1;
NeilBrown58427302006-10-06 00:44:04 -07004020 rdev->saved_raid_disk = -1;
NeilBrown2bf071b2006-01-06 00:20:55 -08004021 err = bind_rdev_to_array(rdev, mddev);
4022 if (err)
4023 goto abort_export;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004024
4025 /*
4026 * The rest should better be atomic, we can have disk failures
4027 * noticed in interrupt contexts ...
4028 */
4029
4030 if (rdev->desc_nr == mddev->max_disks) {
4031 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4032 mdname(mddev));
4033 err = -EBUSY;
4034 goto abort_unbind_export;
4035 }
4036
4037 rdev->raid_disk = -1;
4038
NeilBrown850b2b42006-10-03 01:15:46 -07004039 md_update_sb(mddev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004040
4041 /*
4042 * Kick recovery, maybe this spare has to be added to the
4043 * array immediately.
4044 */
4045 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4046 md_wakeup_thread(mddev->thread);
NeilBrownd7603b72006-01-06 00:20:30 -08004047 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004048 return 0;
4049
4050abort_unbind_export:
4051 unbind_rdev_from_array(rdev);
4052
4053abort_export:
4054 export_rdev(rdev);
4055 return err;
4056}
4057
NeilBrown32a76272005-06-21 17:17:14 -07004058static int set_bitmap_file(mddev_t *mddev, int fd)
4059{
4060 int err;
4061
NeilBrown36fa3062005-09-09 16:23:45 -07004062 if (mddev->pers) {
4063 if (!mddev->pers->quiesce)
4064 return -EBUSY;
4065 if (mddev->recovery || mddev->sync_thread)
4066 return -EBUSY;
4067 /* we should be able to change the bitmap.. */
NeilBrown32a76272005-06-21 17:17:14 -07004068 }
4069
NeilBrown36fa3062005-09-09 16:23:45 -07004070
4071 if (fd >= 0) {
4072 if (mddev->bitmap)
4073 return -EEXIST; /* cannot add when bitmap is present */
4074 mddev->bitmap_file = fget(fd);
4075
4076 if (mddev->bitmap_file == NULL) {
4077 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4078 mdname(mddev));
4079 return -EBADF;
4080 }
4081
4082 err = deny_bitmap_write_access(mddev->bitmap_file);
4083 if (err) {
4084 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4085 mdname(mddev));
4086 fput(mddev->bitmap_file);
4087 mddev->bitmap_file = NULL;
4088 return err;
4089 }
NeilBrowna654b9d82005-06-21 17:17:27 -07004090 mddev->bitmap_offset = 0; /* file overrides offset */
NeilBrown36fa3062005-09-09 16:23:45 -07004091 } else if (mddev->bitmap == NULL)
4092 return -ENOENT; /* cannot remove what isn't there */
4093 err = 0;
4094 if (mddev->pers) {
4095 mddev->pers->quiesce(mddev, 1);
4096 if (fd >= 0)
4097 err = bitmap_create(mddev);
NeilBrownd7375ab2006-06-26 00:27:43 -07004098 if (fd < 0 || err) {
NeilBrown36fa3062005-09-09 16:23:45 -07004099 bitmap_destroy(mddev);
NeilBrownd7375ab2006-06-26 00:27:43 -07004100 fd = -1; /* make sure to put the file */
4101 }
NeilBrown36fa3062005-09-09 16:23:45 -07004102 mddev->pers->quiesce(mddev, 0);
NeilBrownd7375ab2006-06-26 00:27:43 -07004103 }
4104 if (fd < 0) {
NeilBrownacc55e22006-06-26 00:27:47 -07004105 if (mddev->bitmap_file) {
4106 restore_bitmap_write_access(mddev->bitmap_file);
NeilBrown36fa3062005-09-09 16:23:45 -07004107 fput(mddev->bitmap_file);
NeilBrownacc55e22006-06-26 00:27:47 -07004108 }
NeilBrown36fa3062005-09-09 16:23:45 -07004109 mddev->bitmap_file = NULL;
4110 }
4111
NeilBrown32a76272005-06-21 17:17:14 -07004112 return err;
4113}
4114
Linus Torvalds1da177e2005-04-16 15:20:36 -07004115/*
4116 * set_array_info is used two different ways
4117 * The original usage is when creating a new array.
4118 * In this usage, raid_disks is > 0 and it together with
4119 * level, size, not_persistent,layout,chunksize determine the
4120 * shape of the array.
4121 * This will always create an array with a type-0.90.0 superblock.
4122 * The newer usage is when assembling an array.
4123 * In this case raid_disks will be 0, and the major_version field is
4124 * use to determine which style super-blocks are to be found on the devices.
4125 * The minor and patch _version numbers are also kept incase the
4126 * super_block handler wishes to interpret them.
4127 */
4128static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4129{
4130
4131 if (info->raid_disks == 0) {
4132 /* just setting version number for superblock loading */
4133 if (info->major_version < 0 ||
Ahmed S. Darwish50511da2007-05-09 02:35:34 -07004134 info->major_version >= ARRAY_SIZE(super_types) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07004135 super_types[info->major_version].name == NULL) {
4136 /* maybe try to auto-load a module? */
4137 printk(KERN_INFO
4138 "md: superblock version %d not known\n",
4139 info->major_version);
4140 return -EINVAL;
4141 }
4142 mddev->major_version = info->major_version;
4143 mddev->minor_version = info->minor_version;
4144 mddev->patch_version = info->patch_version;
NeilBrown3f9d7b02006-12-22 01:11:41 -08004145 mddev->persistent = !info->not_persistent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004146 return 0;
4147 }
4148 mddev->major_version = MD_MAJOR_VERSION;
4149 mddev->minor_version = MD_MINOR_VERSION;
4150 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4151 mddev->ctime = get_seconds();
4152
4153 mddev->level = info->level;
NeilBrown17115e02006-01-16 22:14:57 -08004154 mddev->clevel[0] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004155 mddev->size = info->size;
4156 mddev->raid_disks = info->raid_disks;
4157 /* don't set md_minor, it is determined by which /dev/md* was
4158 * openned
4159 */
4160 if (info->state & (1<<MD_SB_CLEAN))
4161 mddev->recovery_cp = MaxSector;
4162 else
4163 mddev->recovery_cp = 0;
4164 mddev->persistent = ! info->not_persistent;
4165
4166 mddev->layout = info->layout;
4167 mddev->chunk_size = info->chunk_size;
4168
4169 mddev->max_disks = MD_SB_DISKS;
4170
NeilBrown850b2b42006-10-03 01:15:46 -07004171 mddev->flags = 0;
4172 set_bit(MD_CHANGE_DEVS, &mddev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004173
NeilBrownb2a27032005-11-28 13:44:12 -08004174 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4175 mddev->bitmap_offset = 0;
4176
NeilBrownf6705572006-03-27 01:18:11 -08004177 mddev->reshape_position = MaxSector;
4178
Linus Torvalds1da177e2005-04-16 15:20:36 -07004179 /*
4180 * Generate a 128 bit UUID
4181 */
4182 get_random_bytes(mddev->uuid, 16);
4183
NeilBrownf6705572006-03-27 01:18:11 -08004184 mddev->new_level = mddev->level;
4185 mddev->new_chunk = mddev->chunk_size;
4186 mddev->new_layout = mddev->layout;
4187 mddev->delta_disks = 0;
4188
Linus Torvalds1da177e2005-04-16 15:20:36 -07004189 return 0;
4190}
4191
NeilBrowna35b0d62006-01-06 00:20:49 -08004192static int update_size(mddev_t *mddev, unsigned long size)
4193{
4194 mdk_rdev_t * rdev;
4195 int rv;
4196 struct list_head *tmp;
NeilBrown8ddeeae2006-03-27 01:18:18 -08004197 int fit = (size == 0);
NeilBrowna35b0d62006-01-06 00:20:49 -08004198
4199 if (mddev->pers->resize == NULL)
4200 return -EINVAL;
4201 /* The "size" is the amount of each device that is used.
4202 * This can only make sense for arrays with redundancy.
4203 * linear and raid0 always use whatever space is available
4204 * We can only consider changing the size if no resync
4205 * or reconstruction is happening, and if the new size
4206 * is acceptable. It must fit before the sb_offset or,
4207 * if that is <data_offset, it must fit before the
4208 * size of each device.
4209 * If size is zero, we find the largest size that fits.
4210 */
4211 if (mddev->sync_thread)
4212 return -EBUSY;
4213 ITERATE_RDEV(mddev,rdev,tmp) {
4214 sector_t avail;
NeilBrown01ab5662006-10-28 10:38:30 -07004215 avail = rdev->size * 2;
4216
NeilBrowna35b0d62006-01-06 00:20:49 -08004217 if (fit && (size == 0 || size > avail/2))
4218 size = avail/2;
4219 if (avail < ((sector_t)size << 1))
4220 return -ENOSPC;
4221 }
4222 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4223 if (!rv) {
4224 struct block_device *bdev;
4225
4226 bdev = bdget_disk(mddev->gendisk, 0);
4227 if (bdev) {
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08004228 mutex_lock(&bdev->bd_inode->i_mutex);
NeilBrown6d893322006-02-02 14:28:03 -08004229 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08004230 mutex_unlock(&bdev->bd_inode->i_mutex);
NeilBrowna35b0d62006-01-06 00:20:49 -08004231 bdput(bdev);
4232 }
4233 }
4234 return rv;
4235}
4236
NeilBrownda943b992006-01-06 00:20:54 -08004237static int update_raid_disks(mddev_t *mddev, int raid_disks)
4238{
4239 int rv;
4240 /* change the number of raid disks */
NeilBrown63c70c42006-03-27 01:18:13 -08004241 if (mddev->pers->check_reshape == NULL)
NeilBrownda943b992006-01-06 00:20:54 -08004242 return -EINVAL;
4243 if (raid_disks <= 0 ||
4244 raid_disks >= mddev->max_disks)
4245 return -EINVAL;
NeilBrown63c70c42006-03-27 01:18:13 -08004246 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
NeilBrownda943b992006-01-06 00:20:54 -08004247 return -EBUSY;
NeilBrown63c70c42006-03-27 01:18:13 -08004248 mddev->delta_disks = raid_disks - mddev->raid_disks;
4249
4250 rv = mddev->pers->check_reshape(mddev);
NeilBrownda943b992006-01-06 00:20:54 -08004251 return rv;
4252}
4253
4254
Linus Torvalds1da177e2005-04-16 15:20:36 -07004255/*
4256 * update_array_info is used to change the configuration of an
4257 * on-line array.
4258 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4259 * fields in the info are checked against the array.
4260 * Any differences that cannot be handled will cause an error.
4261 * Normally, only one change can be managed at a time.
4262 */
4263static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4264{
4265 int rv = 0;
4266 int cnt = 0;
NeilBrown36fa3062005-09-09 16:23:45 -07004267 int state = 0;
4268
4269 /* calculate expected state,ignoring low bits */
4270 if (mddev->bitmap && mddev->bitmap_offset)
4271 state |= (1 << MD_SB_BITMAP_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004272
4273 if (mddev->major_version != info->major_version ||
4274 mddev->minor_version != info->minor_version ||
4275/* mddev->patch_version != info->patch_version || */
4276 mddev->ctime != info->ctime ||
4277 mddev->level != info->level ||
4278/* mddev->layout != info->layout || */
4279 !mddev->persistent != info->not_persistent||
NeilBrown36fa3062005-09-09 16:23:45 -07004280 mddev->chunk_size != info->chunk_size ||
4281 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4282 ((state^info->state) & 0xfffffe00)
4283 )
Linus Torvalds1da177e2005-04-16 15:20:36 -07004284 return -EINVAL;
4285 /* Check there is only one change */
NeilBrown284ae7c2006-02-03 03:03:40 -08004286 if (info->size >= 0 && mddev->size != info->size) cnt++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004287 if (mddev->raid_disks != info->raid_disks) cnt++;
4288 if (mddev->layout != info->layout) cnt++;
NeilBrown36fa3062005-09-09 16:23:45 -07004289 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004290 if (cnt == 0) return 0;
4291 if (cnt > 1) return -EINVAL;
4292
4293 if (mddev->layout != info->layout) {
4294 /* Change layout
4295 * we don't need to do anything at the md level, the
4296 * personality will take care of it all.
4297 */
4298 if (mddev->pers->reconfig == NULL)
4299 return -EINVAL;
4300 else
4301 return mddev->pers->reconfig(mddev, info->layout, -1);
4302 }
NeilBrown284ae7c2006-02-03 03:03:40 -08004303 if (info->size >= 0 && mddev->size != info->size)
NeilBrowna35b0d62006-01-06 00:20:49 -08004304 rv = update_size(mddev, info->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004305
NeilBrownda943b992006-01-06 00:20:54 -08004306 if (mddev->raid_disks != info->raid_disks)
4307 rv = update_raid_disks(mddev, info->raid_disks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004308
NeilBrown36fa3062005-09-09 16:23:45 -07004309 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4310 if (mddev->pers->quiesce == NULL)
4311 return -EINVAL;
4312 if (mddev->recovery || mddev->sync_thread)
4313 return -EBUSY;
4314 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4315 /* add the bitmap */
4316 if (mddev->bitmap)
4317 return -EEXIST;
4318 if (mddev->default_bitmap_offset == 0)
4319 return -EINVAL;
4320 mddev->bitmap_offset = mddev->default_bitmap_offset;
4321 mddev->pers->quiesce(mddev, 1);
4322 rv = bitmap_create(mddev);
4323 if (rv)
4324 bitmap_destroy(mddev);
4325 mddev->pers->quiesce(mddev, 0);
4326 } else {
4327 /* remove the bitmap */
4328 if (!mddev->bitmap)
4329 return -ENOENT;
4330 if (mddev->bitmap->file)
4331 return -EINVAL;
4332 mddev->pers->quiesce(mddev, 1);
4333 bitmap_destroy(mddev);
4334 mddev->pers->quiesce(mddev, 0);
4335 mddev->bitmap_offset = 0;
4336 }
4337 }
NeilBrown850b2b42006-10-03 01:15:46 -07004338 md_update_sb(mddev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004339 return rv;
4340}
4341
4342static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4343{
4344 mdk_rdev_t *rdev;
4345
4346 if (mddev->pers == NULL)
4347 return -ENODEV;
4348
4349 rdev = find_rdev(mddev, dev);
4350 if (!rdev)
4351 return -ENODEV;
4352
4353 md_error(mddev, rdev);
4354 return 0;
4355}
4356
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08004357static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4358{
4359 mddev_t *mddev = bdev->bd_disk->private_data;
4360
4361 geo->heads = 2;
4362 geo->sectors = 4;
4363 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4364 return 0;
4365}
4366
Linus Torvalds1da177e2005-04-16 15:20:36 -07004367static int md_ioctl(struct inode *inode, struct file *file,
4368 unsigned int cmd, unsigned long arg)
4369{
4370 int err = 0;
4371 void __user *argp = (void __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004372 mddev_t *mddev = NULL;
4373
4374 if (!capable(CAP_SYS_ADMIN))
4375 return -EACCES;
4376
4377 /*
4378 * Commands dealing with the RAID driver but not any
4379 * particular array:
4380 */
4381 switch (cmd)
4382 {
4383 case RAID_VERSION:
4384 err = get_version(argp);
4385 goto done;
4386
4387 case PRINT_RAID_DEBUG:
4388 err = 0;
4389 md_print_devices();
4390 goto done;
4391
4392#ifndef MODULE
4393 case RAID_AUTORUN:
4394 err = 0;
4395 autostart_arrays(arg);
4396 goto done;
4397#endif
4398 default:;
4399 }
4400
4401 /*
4402 * Commands creating/starting a new array:
4403 */
4404
4405 mddev = inode->i_bdev->bd_disk->private_data;
4406
4407 if (!mddev) {
4408 BUG();
4409 goto abort;
4410 }
4411
Linus Torvalds1da177e2005-04-16 15:20:36 -07004412 err = mddev_lock(mddev);
4413 if (err) {
4414 printk(KERN_INFO
4415 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4416 err, cmd);
4417 goto abort;
4418 }
4419
4420 switch (cmd)
4421 {
4422 case SET_ARRAY_INFO:
4423 {
4424 mdu_array_info_t info;
4425 if (!arg)
4426 memset(&info, 0, sizeof(info));
4427 else if (copy_from_user(&info, argp, sizeof(info))) {
4428 err = -EFAULT;
4429 goto abort_unlock;
4430 }
4431 if (mddev->pers) {
4432 err = update_array_info(mddev, &info);
4433 if (err) {
4434 printk(KERN_WARNING "md: couldn't update"
4435 " array info. %d\n", err);
4436 goto abort_unlock;
4437 }
4438 goto done_unlock;
4439 }
4440 if (!list_empty(&mddev->disks)) {
4441 printk(KERN_WARNING
4442 "md: array %s already has disks!\n",
4443 mdname(mddev));
4444 err = -EBUSY;
4445 goto abort_unlock;
4446 }
4447 if (mddev->raid_disks) {
4448 printk(KERN_WARNING
4449 "md: array %s already initialised!\n",
4450 mdname(mddev));
4451 err = -EBUSY;
4452 goto abort_unlock;
4453 }
4454 err = set_array_info(mddev, &info);
4455 if (err) {
4456 printk(KERN_WARNING "md: couldn't set"
4457 " array info. %d\n", err);
4458 goto abort_unlock;
4459 }
4460 }
4461 goto done_unlock;
4462
4463 default:;
4464 }
4465
4466 /*
4467 * Commands querying/configuring an existing array:
4468 */
NeilBrown32a76272005-06-21 17:17:14 -07004469 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
NeilBrown3f9d7b02006-12-22 01:11:41 -08004470 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
NeilBrown32a76272005-06-21 17:17:14 -07004471 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
NeilBrown3f9d7b02006-12-22 01:11:41 -08004472 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4473 && cmd != GET_BITMAP_FILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004474 err = -ENODEV;
4475 goto abort_unlock;
4476 }
4477
4478 /*
4479 * Commands even a read-only array can execute:
4480 */
4481 switch (cmd)
4482 {
4483 case GET_ARRAY_INFO:
4484 err = get_array_info(mddev, argp);
4485 goto done_unlock;
4486
NeilBrown32a76272005-06-21 17:17:14 -07004487 case GET_BITMAP_FILE:
viro@ZenIV.linux.org.uk87162a22005-09-09 20:36:43 +01004488 err = get_bitmap_file(mddev, argp);
NeilBrown32a76272005-06-21 17:17:14 -07004489 goto done_unlock;
4490
Linus Torvalds1da177e2005-04-16 15:20:36 -07004491 case GET_DISK_INFO:
4492 err = get_disk_info(mddev, argp);
4493 goto done_unlock;
4494
4495 case RESTART_ARRAY_RW:
4496 err = restart_array(mddev);
4497 goto done_unlock;
4498
4499 case STOP_ARRAY:
4500 err = do_md_stop (mddev, 0);
4501 goto done_unlock;
4502
4503 case STOP_ARRAY_RO:
4504 err = do_md_stop (mddev, 1);
4505 goto done_unlock;
4506
4507 /*
4508 * We have a problem here : there is no easy way to give a CHS
4509 * virtual geometry. We currently pretend that we have a 2 heads
4510 * 4 sectors (with a BIG number of cylinders...). This drives
4511 * dosfs just mad... ;-)
4512 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004513 }
4514
4515 /*
4516 * The remaining ioctls are changing the state of the
NeilBrownf91de922005-11-08 21:39:36 -08004517 * superblock, so we do not allow them on read-only arrays.
4518 * However non-MD ioctls (e.g. get-size) will still come through
4519 * here and hit the 'default' below, so only disallow
4520 * 'md' ioctls, and switch to rw mode if started auto-readonly.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004521 */
NeilBrownf91de922005-11-08 21:39:36 -08004522 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4523 mddev->ro && mddev->pers) {
4524 if (mddev->ro == 2) {
4525 mddev->ro = 0;
4526 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4527 md_wakeup_thread(mddev->thread);
4528
4529 } else {
4530 err = -EROFS;
4531 goto abort_unlock;
4532 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004533 }
4534
4535 switch (cmd)
4536 {
4537 case ADD_NEW_DISK:
4538 {
4539 mdu_disk_info_t info;
4540 if (copy_from_user(&info, argp, sizeof(info)))
4541 err = -EFAULT;
4542 else
4543 err = add_new_disk(mddev, &info);
4544 goto done_unlock;
4545 }
4546
4547 case HOT_REMOVE_DISK:
4548 err = hot_remove_disk(mddev, new_decode_dev(arg));
4549 goto done_unlock;
4550
4551 case HOT_ADD_DISK:
4552 err = hot_add_disk(mddev, new_decode_dev(arg));
4553 goto done_unlock;
4554
4555 case SET_DISK_FAULTY:
4556 err = set_disk_faulty(mddev, new_decode_dev(arg));
4557 goto done_unlock;
4558
4559 case RUN_ARRAY:
4560 err = do_md_run (mddev);
4561 goto done_unlock;
4562
NeilBrown32a76272005-06-21 17:17:14 -07004563 case SET_BITMAP_FILE:
4564 err = set_bitmap_file(mddev, (int)arg);
4565 goto done_unlock;
4566
Linus Torvalds1da177e2005-04-16 15:20:36 -07004567 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004568 err = -EINVAL;
4569 goto abort_unlock;
4570 }
4571
4572done_unlock:
4573abort_unlock:
4574 mddev_unlock(mddev);
4575
4576 return err;
4577done:
4578 if (err)
4579 MD_BUG();
4580abort:
4581 return err;
4582}
4583
4584static int md_open(struct inode *inode, struct file *file)
4585{
4586 /*
4587 * Succeed if we can lock the mddev, which confirms that
4588 * it isn't being stopped right now.
4589 */
4590 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4591 int err;
4592
NeilBrownd63a5a72006-12-08 02:36:17 -08004593 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004594 goto out;
4595
4596 err = 0;
4597 mddev_get(mddev);
4598 mddev_unlock(mddev);
4599
4600 check_disk_change(inode->i_bdev);
4601 out:
4602 return err;
4603}
4604
4605static int md_release(struct inode *inode, struct file * file)
4606{
4607 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4608
Eric Sesterhenn52e5f9d2006-10-03 23:33:23 +02004609 BUG_ON(!mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004610 mddev_put(mddev);
4611
4612 return 0;
4613}
4614
Linus Torvalds44ce6292007-05-09 18:51:36 -07004615static int md_media_changed(struct gendisk *disk)
4616{
4617 mddev_t *mddev = disk->private_data;
4618
4619 return mddev->changed;
4620}
4621
4622static int md_revalidate(struct gendisk *disk)
4623{
4624 mddev_t *mddev = disk->private_data;
4625
4626 mddev->changed = 0;
4627 return 0;
4628}
Linus Torvalds1da177e2005-04-16 15:20:36 -07004629static struct block_device_operations md_fops =
4630{
4631 .owner = THIS_MODULE,
4632 .open = md_open,
4633 .release = md_release,
4634 .ioctl = md_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08004635 .getgeo = md_getgeo,
Linus Torvalds44ce6292007-05-09 18:51:36 -07004636 .media_changed = md_media_changed,
4637 .revalidate_disk= md_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004638};
4639
Adrian Bunk75c96f82005-05-05 16:16:09 -07004640static int md_thread(void * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004641{
4642 mdk_thread_t *thread = arg;
4643
Linus Torvalds1da177e2005-04-16 15:20:36 -07004644 /*
4645 * md_thread is a 'system-thread', it's priority should be very
4646 * high. We avoid resource deadlocks individually in each
4647 * raid personality. (RAID5 does preallocation) We also use RR and
4648 * the very same RT priority as kswapd, thus we will never get
4649 * into a priority inversion deadlock.
4650 *
4651 * we definitely have to have equal or higher priority than
4652 * bdflush, otherwise bdflush will deadlock if there are too
4653 * many dirty RAID5 blocks.
4654 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004655
NeilBrown6985c432005-10-19 21:23:47 -07004656 allow_signal(SIGKILL);
NeilBrowna6fb0932005-09-09 16:23:56 -07004657 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004658
NeilBrown93588e22005-11-15 00:09:12 -08004659 /* We need to wait INTERRUPTIBLE so that
4660 * we don't add to the load-average.
4661 * That means we need to be sure no signals are
4662 * pending
4663 */
4664 if (signal_pending(current))
4665 flush_signals(current);
4666
4667 wait_event_interruptible_timeout
4668 (thread->wqueue,
4669 test_bit(THREAD_WAKEUP, &thread->flags)
4670 || kthread_should_stop(),
4671 thread->timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004672
4673 clear_bit(THREAD_WAKEUP, &thread->flags);
4674
NeilBrown787453c2005-11-08 21:39:43 -08004675 thread->run(thread->mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004676 }
NeilBrowna6fb0932005-09-09 16:23:56 -07004677
Linus Torvalds1da177e2005-04-16 15:20:36 -07004678 return 0;
4679}
4680
4681void md_wakeup_thread(mdk_thread_t *thread)
4682{
4683 if (thread) {
4684 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4685 set_bit(THREAD_WAKEUP, &thread->flags);
4686 wake_up(&thread->wqueue);
4687 }
4688}
4689
4690mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4691 const char *name)
4692{
4693 mdk_thread_t *thread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004694
NeilBrown9ffae0c2006-01-06 00:20:32 -08004695 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004696 if (!thread)
4697 return NULL;
4698
Linus Torvalds1da177e2005-04-16 15:20:36 -07004699 init_waitqueue_head(&thread->wqueue);
4700
Linus Torvalds1da177e2005-04-16 15:20:36 -07004701 thread->run = run;
4702 thread->mddev = mddev;
NeilBrown32a76272005-06-21 17:17:14 -07004703 thread->timeout = MAX_SCHEDULE_TIMEOUT;
NeilBrown6985c432005-10-19 21:23:47 -07004704 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
NeilBrowna6fb0932005-09-09 16:23:56 -07004705 if (IS_ERR(thread->tsk)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004706 kfree(thread);
4707 return NULL;
4708 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004709 return thread;
4710}
4711
Linus Torvalds1da177e2005-04-16 15:20:36 -07004712void md_unregister_thread(mdk_thread_t *thread)
4713{
NeilBrownd28446f2005-04-16 15:26:41 -07004714 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
NeilBrowna6fb0932005-09-09 16:23:56 -07004715
4716 kthread_stop(thread->tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004717 kfree(thread);
4718}
4719
4720void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4721{
4722 if (!mddev) {
4723 MD_BUG();
4724 return;
4725 }
4726
NeilBrownb2d444d2005-11-08 21:39:31 -08004727 if (!rdev || test_bit(Faulty, &rdev->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004728 return;
NeilBrown32a76272005-06-21 17:17:14 -07004729/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07004730 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4731 mdname(mddev),
4732 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4733 __builtin_return_address(0),__builtin_return_address(1),
4734 __builtin_return_address(2),__builtin_return_address(3));
NeilBrown32a76272005-06-21 17:17:14 -07004735*/
Andrew Mortond0a0a5e2006-07-10 04:44:20 -07004736 if (!mddev->pers)
4737 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004738 if (!mddev->pers->error_handler)
4739 return;
4740 mddev->pers->error_handler(mddev,rdev);
4741 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4742 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4743 md_wakeup_thread(mddev->thread);
NeilBrownc331eb02006-05-30 21:27:13 -07004744 md_new_event_inintr(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004745}
4746
4747/* seq_file implementation /proc/mdstat */
4748
4749static void status_unused(struct seq_file *seq)
4750{
4751 int i = 0;
4752 mdk_rdev_t *rdev;
4753 struct list_head *tmp;
4754
4755 seq_printf(seq, "unused devices: ");
4756
4757 ITERATE_RDEV_PENDING(rdev,tmp) {
4758 char b[BDEVNAME_SIZE];
4759 i++;
4760 seq_printf(seq, "%s ",
4761 bdevname(rdev->bdev,b));
4762 }
4763 if (!i)
4764 seq_printf(seq, "<none>");
4765
4766 seq_printf(seq, "\n");
4767}
4768
4769
4770static void status_resync(struct seq_file *seq, mddev_t * mddev)
4771{
NeilBrown4588b422006-03-27 01:18:04 -08004772 sector_t max_blocks, resync, res;
4773 unsigned long dt, db, rt;
4774 int scale;
4775 unsigned int per_milli;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004776
4777 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4778
4779 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4780 max_blocks = mddev->resync_max_sectors >> 1;
4781 else
4782 max_blocks = mddev->size;
4783
4784 /*
4785 * Should not happen.
4786 */
4787 if (!max_blocks) {
4788 MD_BUG();
4789 return;
4790 }
NeilBrown4588b422006-03-27 01:18:04 -08004791 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4792 * in a sector_t, and (max_blocks>>scale) will fit in a
4793 * u32, as those are the requirements for sector_div.
4794 * Thus 'scale' must be at least 10
4795 */
4796 scale = 10;
4797 if (sizeof(sector_t) > sizeof(unsigned long)) {
4798 while ( max_blocks/2 > (1ULL<<(scale+32)))
4799 scale++;
4800 }
4801 res = (resync>>scale)*1000;
4802 sector_div(res, (u32)((max_blocks>>scale)+1));
4803
4804 per_milli = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004805 {
NeilBrown4588b422006-03-27 01:18:04 -08004806 int i, x = per_milli/50, y = 20-x;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004807 seq_printf(seq, "[");
4808 for (i = 0; i < x; i++)
4809 seq_printf(seq, "=");
4810 seq_printf(seq, ">");
4811 for (i = 0; i < y; i++)
4812 seq_printf(seq, ".");
4813 seq_printf(seq, "] ");
4814 }
NeilBrown4588b422006-03-27 01:18:04 -08004815 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
NeilBrownccfcc3c2006-03-27 01:18:09 -08004816 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4817 "reshape" :
NeilBrown61df9d92006-10-03 01:15:57 -07004818 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4819 "check" :
4820 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4821 "resync" : "recovery"))),
4822 per_milli/10, per_milli % 10,
NeilBrown4588b422006-03-27 01:18:04 -08004823 (unsigned long long) resync,
4824 (unsigned long long) max_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004825
4826 /*
4827 * We do not want to overflow, so the order of operands and
4828 * the * 100 / 100 trick are important. We do a +1 to be
4829 * safe against division by zero. We only estimate anyway.
4830 *
4831 * dt: time from mark until now
4832 * db: blocks written from mark until now
4833 * rt: remaining time
4834 */
4835 dt = ((jiffies - mddev->resync_mark) / HZ);
4836 if (!dt) dt++;
NeilBrownff4e8d92006-07-10 04:44:16 -07004837 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4838 - mddev->resync_mark_cnt;
4839 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004840
4841 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4842
NeilBrownff4e8d92006-07-10 04:44:16 -07004843 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004844}
4845
4846static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4847{
4848 struct list_head *tmp;
4849 loff_t l = *pos;
4850 mddev_t *mddev;
4851
4852 if (l >= 0x10000)
4853 return NULL;
4854 if (!l--)
4855 /* header */
4856 return (void*)1;
4857
4858 spin_lock(&all_mddevs_lock);
4859 list_for_each(tmp,&all_mddevs)
4860 if (!l--) {
4861 mddev = list_entry(tmp, mddev_t, all_mddevs);
4862 mddev_get(mddev);
4863 spin_unlock(&all_mddevs_lock);
4864 return mddev;
4865 }
4866 spin_unlock(&all_mddevs_lock);
4867 if (!l--)
4868 return (void*)2;/* tail */
4869 return NULL;
4870}
4871
4872static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4873{
4874 struct list_head *tmp;
4875 mddev_t *next_mddev, *mddev = v;
4876
4877 ++*pos;
4878 if (v == (void*)2)
4879 return NULL;
4880
4881 spin_lock(&all_mddevs_lock);
4882 if (v == (void*)1)
4883 tmp = all_mddevs.next;
4884 else
4885 tmp = mddev->all_mddevs.next;
4886 if (tmp != &all_mddevs)
4887 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4888 else {
4889 next_mddev = (void*)2;
4890 *pos = 0x10000;
4891 }
4892 spin_unlock(&all_mddevs_lock);
4893
4894 if (v != (void*)1)
4895 mddev_put(mddev);
4896 return next_mddev;
4897
4898}
4899
4900static void md_seq_stop(struct seq_file *seq, void *v)
4901{
4902 mddev_t *mddev = v;
4903
4904 if (mddev && v != (void*)1 && v != (void*)2)
4905 mddev_put(mddev);
4906}
4907
NeilBrownd7603b72006-01-06 00:20:30 -08004908struct mdstat_info {
4909 int event;
4910};
4911
Linus Torvalds1da177e2005-04-16 15:20:36 -07004912static int md_seq_show(struct seq_file *seq, void *v)
4913{
4914 mddev_t *mddev = v;
4915 sector_t size;
4916 struct list_head *tmp2;
4917 mdk_rdev_t *rdev;
NeilBrownd7603b72006-01-06 00:20:30 -08004918 struct mdstat_info *mi = seq->private;
NeilBrown32a76272005-06-21 17:17:14 -07004919 struct bitmap *bitmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004920
4921 if (v == (void*)1) {
NeilBrown2604b702006-01-06 00:20:36 -08004922 struct mdk_personality *pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004923 seq_printf(seq, "Personalities : ");
4924 spin_lock(&pers_lock);
NeilBrown2604b702006-01-06 00:20:36 -08004925 list_for_each_entry(pers, &pers_list, list)
4926 seq_printf(seq, "[%s] ", pers->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004927
4928 spin_unlock(&pers_lock);
4929 seq_printf(seq, "\n");
NeilBrownd7603b72006-01-06 00:20:30 -08004930 mi->event = atomic_read(&md_event_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004931 return 0;
4932 }
4933 if (v == (void*)2) {
4934 status_unused(seq);
4935 return 0;
4936 }
4937
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07004938 if (mddev_lock(mddev) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004939 return -EINTR;
Ingo Molnar5dc5cf72006-04-20 02:43:23 -07004940
Linus Torvalds1da177e2005-04-16 15:20:36 -07004941 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4942 seq_printf(seq, "%s : %sactive", mdname(mddev),
4943 mddev->pers ? "" : "in");
4944 if (mddev->pers) {
NeilBrownf91de922005-11-08 21:39:36 -08004945 if (mddev->ro==1)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004946 seq_printf(seq, " (read-only)");
NeilBrownf91de922005-11-08 21:39:36 -08004947 if (mddev->ro==2)
4948 seq_printf(seq, "(auto-read-only)");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004949 seq_printf(seq, " %s", mddev->pers->name);
4950 }
4951
4952 size = 0;
4953 ITERATE_RDEV(mddev,rdev,tmp2) {
4954 char b[BDEVNAME_SIZE];
4955 seq_printf(seq, " %s[%d]",
4956 bdevname(rdev->bdev,b), rdev->desc_nr);
NeilBrown8ddf9ef2005-09-09 16:23:45 -07004957 if (test_bit(WriteMostly, &rdev->flags))
4958 seq_printf(seq, "(W)");
NeilBrownb2d444d2005-11-08 21:39:31 -08004959 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004960 seq_printf(seq, "(F)");
4961 continue;
NeilBrownb325a322005-09-09 16:24:00 -07004962 } else if (rdev->raid_disk < 0)
4963 seq_printf(seq, "(S)"); /* spare */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004964 size += rdev->size;
4965 }
4966
4967 if (!list_empty(&mddev->disks)) {
4968 if (mddev->pers)
4969 seq_printf(seq, "\n %llu blocks",
4970 (unsigned long long)mddev->array_size);
4971 else
4972 seq_printf(seq, "\n %llu blocks",
4973 (unsigned long long)size);
4974 }
NeilBrown1cd6bf12005-09-09 16:24:00 -07004975 if (mddev->persistent) {
4976 if (mddev->major_version != 0 ||
4977 mddev->minor_version != 90) {
4978 seq_printf(seq," super %d.%d",
4979 mddev->major_version,
4980 mddev->minor_version);
4981 }
4982 } else
4983 seq_printf(seq, " super non-persistent");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004984
4985 if (mddev->pers) {
4986 mddev->pers->status (seq, mddev);
4987 seq_printf(seq, "\n ");
NeilBrown8e1b39d2005-11-08 21:39:41 -08004988 if (mddev->pers->sync_request) {
4989 if (mddev->curr_resync > 2) {
4990 status_resync (seq, mddev);
4991 seq_printf(seq, "\n ");
4992 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4993 seq_printf(seq, "\tresync=DELAYED\n ");
4994 else if (mddev->recovery_cp < MaxSector)
4995 seq_printf(seq, "\tresync=PENDING\n ");
4996 }
NeilBrown32a76272005-06-21 17:17:14 -07004997 } else
4998 seq_printf(seq, "\n ");
4999
5000 if ((bitmap = mddev->bitmap)) {
NeilBrown32a76272005-06-21 17:17:14 -07005001 unsigned long chunk_kb;
5002 unsigned long flags;
NeilBrown32a76272005-06-21 17:17:14 -07005003 spin_lock_irqsave(&bitmap->lock, flags);
5004 chunk_kb = bitmap->chunksize >> 10;
5005 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5006 "%lu%s chunk",
5007 bitmap->pages - bitmap->missing_pages,
5008 bitmap->pages,
5009 (bitmap->pages - bitmap->missing_pages)
5010 << (PAGE_SHIFT - 10),
5011 chunk_kb ? chunk_kb : bitmap->chunksize,
5012 chunk_kb ? "KB" : "B");
NeilBrown78d742d2005-06-21 17:17:15 -07005013 if (bitmap->file) {
5014 seq_printf(seq, ", file: ");
Josef Sipekc649bb92006-12-08 02:37:19 -08005015 seq_path(seq, bitmap->file->f_path.mnt,
5016 bitmap->file->f_path.dentry," \t\n");
NeilBrown32a76272005-06-21 17:17:14 -07005017 }
NeilBrown78d742d2005-06-21 17:17:15 -07005018
NeilBrown32a76272005-06-21 17:17:14 -07005019 seq_printf(seq, "\n");
5020 spin_unlock_irqrestore(&bitmap->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005021 }
5022
5023 seq_printf(seq, "\n");
5024 }
5025 mddev_unlock(mddev);
5026
5027 return 0;
5028}
5029
5030static struct seq_operations md_seq_ops = {
5031 .start = md_seq_start,
5032 .next = md_seq_next,
5033 .stop = md_seq_stop,
5034 .show = md_seq_show,
5035};
5036
5037static int md_seq_open(struct inode *inode, struct file *file)
5038{
5039 int error;
NeilBrownd7603b72006-01-06 00:20:30 -08005040 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5041 if (mi == NULL)
5042 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005043
5044 error = seq_open(file, &md_seq_ops);
NeilBrownd7603b72006-01-06 00:20:30 -08005045 if (error)
5046 kfree(mi);
5047 else {
5048 struct seq_file *p = file->private_data;
5049 p->private = mi;
5050 mi->event = atomic_read(&md_event_count);
5051 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005052 return error;
5053}
5054
NeilBrownd7603b72006-01-06 00:20:30 -08005055static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5056{
5057 struct seq_file *m = filp->private_data;
5058 struct mdstat_info *mi = m->private;
5059 int mask;
5060
5061 poll_wait(filp, &md_event_waiters, wait);
5062
5063 /* always allow read */
5064 mask = POLLIN | POLLRDNORM;
5065
5066 if (mi->event != atomic_read(&md_event_count))
5067 mask |= POLLERR | POLLPRI;
5068 return mask;
5069}
5070
Arjan van de Venfa027c22007-02-12 00:55:33 -08005071static const struct file_operations md_seq_fops = {
Akinobu Mitae24650c2006-10-17 00:09:38 -07005072 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005073 .open = md_seq_open,
5074 .read = seq_read,
5075 .llseek = seq_lseek,
Martin Peschkec3f94b402007-05-09 02:35:35 -07005076 .release = seq_release_private,
NeilBrownd7603b72006-01-06 00:20:30 -08005077 .poll = mdstat_poll,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005078};
5079
NeilBrown2604b702006-01-06 00:20:36 -08005080int register_md_personality(struct mdk_personality *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005081{
Linus Torvalds1da177e2005-04-16 15:20:36 -07005082 spin_lock(&pers_lock);
NeilBrown2604b702006-01-06 00:20:36 -08005083 list_add_tail(&p->list, &pers_list);
5084 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005085 spin_unlock(&pers_lock);
5086 return 0;
5087}
5088
NeilBrown2604b702006-01-06 00:20:36 -08005089int unregister_md_personality(struct mdk_personality *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005090{
NeilBrown2604b702006-01-06 00:20:36 -08005091 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005092 spin_lock(&pers_lock);
NeilBrown2604b702006-01-06 00:20:36 -08005093 list_del_init(&p->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005094 spin_unlock(&pers_lock);
5095 return 0;
5096}
5097
5098static int is_mddev_idle(mddev_t *mddev)
5099{
5100 mdk_rdev_t * rdev;
5101 struct list_head *tmp;
5102 int idle;
NeilBrown713f6ab2007-07-17 04:06:12 -07005103 long curr_events;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005104
5105 idle = 1;
5106 ITERATE_RDEV(mddev,rdev,tmp) {
5107 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
Jens Axboea3623572005-11-01 09:26:16 +01005108 curr_events = disk_stat_read(disk, sectors[0]) +
5109 disk_stat_read(disk, sectors[1]) -
Linus Torvalds1da177e2005-04-16 15:20:36 -07005110 atomic_read(&disk->sync_io);
NeilBrown713f6ab2007-07-17 04:06:12 -07005111 /* sync IO will cause sync_io to increase before the disk_stats
5112 * as sync_io is counted when a request starts, and
5113 * disk_stats is counted when it completes.
5114 * So resync activity will cause curr_events to be smaller than
5115 * when there was no such activity.
5116 * non-sync IO will cause disk_stat to increase without
5117 * increasing sync_io so curr_events will (eventually)
5118 * be larger than it was before. Once it becomes
5119 * substantially larger, the test below will cause
5120 * the array to appear non-idle, and resync will slow
5121 * down.
5122 * If there is a lot of outstanding resync activity when
5123 * we set last_event to curr_events, then all that activity
5124 * completing might cause the array to appear non-idle
5125 * and resync will be slowed down even though there might
5126 * not have been non-resync activity. This will only
5127 * happen once though. 'last_events' will soon reflect
5128 * the state where there is little or no outstanding
5129 * resync requests, and further resync activity will
5130 * always make curr_events less than last_events.
NeilBrownc0e48522005-11-18 01:11:01 -08005131 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005132 */
NeilBrown713f6ab2007-07-17 04:06:12 -07005133 if (curr_events - rdev->last_events > 4096) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005134 rdev->last_events = curr_events;
5135 idle = 0;
5136 }
5137 }
5138 return idle;
5139}
5140
5141void md_done_sync(mddev_t *mddev, int blocks, int ok)
5142{
5143 /* another "blocks" (512byte) blocks have been synced */
5144 atomic_sub(blocks, &mddev->recovery_active);
5145 wake_up(&mddev->recovery_wait);
5146 if (!ok) {
5147 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5148 md_wakeup_thread(mddev->thread);
5149 // stop recovery, signal do_sync ....
5150 }
5151}
5152
5153
NeilBrown06d91a52005-06-21 17:17:12 -07005154/* md_write_start(mddev, bi)
5155 * If we need to update some array metadata (e.g. 'active' flag
NeilBrown3d310eb2005-06-21 17:17:26 -07005156 * in superblock) before writing, schedule a superblock update
5157 * and wait for it to complete.
NeilBrown06d91a52005-06-21 17:17:12 -07005158 */
NeilBrown3d310eb2005-06-21 17:17:26 -07005159void md_write_start(mddev_t *mddev, struct bio *bi)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005160{
NeilBrown06d91a52005-06-21 17:17:12 -07005161 if (bio_data_dir(bi) != WRITE)
NeilBrown3d310eb2005-06-21 17:17:26 -07005162 return;
NeilBrown06d91a52005-06-21 17:17:12 -07005163
NeilBrownf91de922005-11-08 21:39:36 -08005164 BUG_ON(mddev->ro == 1);
5165 if (mddev->ro == 2) {
5166 /* need to switch to read/write */
5167 mddev->ro = 0;
5168 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5169 md_wakeup_thread(mddev->thread);
5170 }
NeilBrown06d91a52005-06-21 17:17:12 -07005171 atomic_inc(&mddev->writes_pending);
NeilBrown06d91a52005-06-21 17:17:12 -07005172 if (mddev->in_sync) {
NeilBrowna9701a32005-11-08 21:39:34 -08005173 spin_lock_irq(&mddev->write_lock);
NeilBrown3d310eb2005-06-21 17:17:26 -07005174 if (mddev->in_sync) {
5175 mddev->in_sync = 0;
NeilBrown850b2b42006-10-03 01:15:46 -07005176 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
NeilBrown3d310eb2005-06-21 17:17:26 -07005177 md_wakeup_thread(mddev->thread);
5178 }
NeilBrowna9701a32005-11-08 21:39:34 -08005179 spin_unlock_irq(&mddev->write_lock);
NeilBrown06d91a52005-06-21 17:17:12 -07005180 }
NeilBrown850b2b42006-10-03 01:15:46 -07005181 wait_event(mddev->sb_wait, mddev->flags==0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005182}
5183
5184void md_write_end(mddev_t *mddev)
5185{
5186 if (atomic_dec_and_test(&mddev->writes_pending)) {
5187 if (mddev->safemode == 2)
5188 md_wakeup_thread(mddev->thread);
NeilBrown16f17b32006-06-26 00:27:37 -07005189 else if (mddev->safemode_delay)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005190 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5191 }
5192}
5193
NeilBrown2a2275d2007-01-26 00:57:11 -08005194/* md_allow_write(mddev)
5195 * Calling this ensures that the array is marked 'active' so that writes
5196 * may proceed without blocking. It is important to call this before
5197 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5198 * Must be called with mddev_lock held.
5199 */
5200void md_allow_write(mddev_t *mddev)
5201{
5202 if (!mddev->pers)
5203 return;
5204 if (mddev->ro)
5205 return;
5206
5207 spin_lock_irq(&mddev->write_lock);
5208 if (mddev->in_sync) {
5209 mddev->in_sync = 0;
5210 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5211 if (mddev->safemode_delay &&
5212 mddev->safemode == 0)
5213 mddev->safemode = 1;
5214 spin_unlock_irq(&mddev->write_lock);
5215 md_update_sb(mddev, 0);
5216 } else
5217 spin_unlock_irq(&mddev->write_lock);
5218}
5219EXPORT_SYMBOL_GPL(md_allow_write);
5220
Adrian Bunk75c96f82005-05-05 16:16:09 -07005221static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005222
5223#define SYNC_MARKS 10
5224#define SYNC_MARK_STEP (3*HZ)
NeilBrown29269552006-03-27 01:18:10 -08005225void md_do_sync(mddev_t *mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005226{
5227 mddev_t *mddev2;
5228 unsigned int currspeed = 0,
5229 window;
NeilBrown57afd892005-06-21 17:17:13 -07005230 sector_t max_sectors,j, io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005231 unsigned long mark[SYNC_MARKS];
5232 sector_t mark_cnt[SYNC_MARKS];
5233 int last_mark,m;
5234 struct list_head *tmp;
5235 sector_t last_check;
NeilBrown57afd892005-06-21 17:17:13 -07005236 int skipped = 0;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005237 struct list_head *rtmp;
5238 mdk_rdev_t *rdev;
NeilBrown61df9d92006-10-03 01:15:57 -07005239 char *desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005240
5241 /* just incase thread restarts... */
5242 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5243 return;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005244 if (mddev->ro) /* never try to sync a read-only array */
5245 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005246
NeilBrown61df9d92006-10-03 01:15:57 -07005247 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5248 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5249 desc = "data-check";
5250 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5251 desc = "requested-resync";
5252 else
5253 desc = "resync";
5254 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5255 desc = "reshape";
5256 else
5257 desc = "recovery";
5258
Linus Torvalds1da177e2005-04-16 15:20:36 -07005259 /* we overload curr_resync somewhat here.
5260 * 0 == not engaged in resync at all
5261 * 2 == checking that there is no conflict with another sync
5262 * 1 == like 2, but have yielded to allow conflicting resync to
5263 * commense
5264 * other == active in resync - this many blocks
5265 *
5266 * Before starting a resync we must have set curr_resync to
5267 * 2, and then checked that every "conflicting" array has curr_resync
5268 * less than ours. When we find one that is the same or higher
5269 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5270 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5271 * This will mean we have to start checking from the beginning again.
5272 *
5273 */
5274
5275 do {
5276 mddev->curr_resync = 2;
5277
5278 try_again:
NeilBrown787453c2005-11-08 21:39:43 -08005279 if (kthread_should_stop()) {
NeilBrown6985c432005-10-19 21:23:47 -07005280 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005281 goto skip;
5282 }
5283 ITERATE_MDDEV(mddev2,tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005284 if (mddev2 == mddev)
5285 continue;
5286 if (mddev2->curr_resync &&
5287 match_mddev_units(mddev,mddev2)) {
5288 DEFINE_WAIT(wq);
5289 if (mddev < mddev2 && mddev->curr_resync == 2) {
5290 /* arbitrarily yield */
5291 mddev->curr_resync = 1;
5292 wake_up(&resync_wait);
5293 }
5294 if (mddev > mddev2 && mddev->curr_resync == 1)
5295 /* no need to wait here, we can wait the next
5296 * time 'round when curr_resync == 2
5297 */
5298 continue;
NeilBrown787453c2005-11-08 21:39:43 -08005299 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5300 if (!kthread_should_stop() &&
NeilBrown8712e552005-10-26 01:58:58 -07005301 mddev2->curr_resync >= mddev->curr_resync) {
NeilBrown61df9d92006-10-03 01:15:57 -07005302 printk(KERN_INFO "md: delaying %s of %s"
5303 " until %s has finished (they"
Linus Torvalds1da177e2005-04-16 15:20:36 -07005304 " share one or more physical units)\n",
NeilBrown61df9d92006-10-03 01:15:57 -07005305 desc, mdname(mddev), mdname(mddev2));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005306 mddev_put(mddev2);
5307 schedule();
5308 finish_wait(&resync_wait, &wq);
5309 goto try_again;
5310 }
5311 finish_wait(&resync_wait, &wq);
5312 }
5313 }
5314 } while (mddev->curr_resync < 2);
5315
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005316 j = 0;
NeilBrown9d888832005-11-08 21:39:26 -08005317 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005318 /* resync follows the size requested by the personality,
NeilBrown57afd892005-06-21 17:17:13 -07005319 * which defaults to physical size, but can be virtual size
Linus Torvalds1da177e2005-04-16 15:20:36 -07005320 */
5321 max_sectors = mddev->resync_max_sectors;
NeilBrown9d888832005-11-08 21:39:26 -08005322 mddev->resync_mismatches = 0;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005323 /* we don't use the checkpoint if there's a bitmap */
5324 if (!mddev->bitmap &&
5325 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5326 j = mddev->recovery_cp;
NeilBrownccfcc3c2006-03-27 01:18:09 -08005327 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5328 max_sectors = mddev->size << 1;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005329 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005330 /* recovery follows the physical size of devices */
5331 max_sectors = mddev->size << 1;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005332 j = MaxSector;
5333 ITERATE_RDEV(mddev,rdev,rtmp)
5334 if (rdev->raid_disk >= 0 &&
5335 !test_bit(Faulty, &rdev->flags) &&
5336 !test_bit(In_sync, &rdev->flags) &&
5337 rdev->recovery_offset < j)
5338 j = rdev->recovery_offset;
5339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005340
NeilBrown61df9d92006-10-03 01:15:57 -07005341 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5342 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5343 " %d KB/sec/disk.\n", speed_min(mddev));
Adrian Bunk338cec32005-09-10 00:26:54 -07005344 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
NeilBrown61df9d92006-10-03 01:15:57 -07005345 "(but not more than %d KB/sec) for %s.\n",
5346 speed_max(mddev), desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005347
5348 is_mddev_idle(mddev); /* this also initializes IO event counters */
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005349
NeilBrown57afd892005-06-21 17:17:13 -07005350 io_sectors = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005351 for (m = 0; m < SYNC_MARKS; m++) {
5352 mark[m] = jiffies;
NeilBrown57afd892005-06-21 17:17:13 -07005353 mark_cnt[m] = io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005354 }
5355 last_mark = 0;
5356 mddev->resync_mark = mark[last_mark];
5357 mddev->resync_mark_cnt = mark_cnt[last_mark];
5358
5359 /*
5360 * Tune reconstruction:
5361 */
5362 window = 32*(PAGE_SIZE/512);
5363 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5364 window/2,(unsigned long long) max_sectors/2);
5365
5366 atomic_set(&mddev->recovery_active, 0);
5367 init_waitqueue_head(&mddev->recovery_wait);
5368 last_check = 0;
5369
5370 if (j>2) {
5371 printk(KERN_INFO
NeilBrown61df9d92006-10-03 01:15:57 -07005372 "md: resuming %s of %s from checkpoint.\n",
5373 desc, mdname(mddev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005374 mddev->curr_resync = j;
5375 }
5376
5377 while (j < max_sectors) {
NeilBrown57afd892005-06-21 17:17:13 -07005378 sector_t sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005379
NeilBrown57afd892005-06-21 17:17:13 -07005380 skipped = 0;
5381 sectors = mddev->pers->sync_request(mddev, j, &skipped,
NeilBrown88202a02006-01-06 00:21:36 -08005382 currspeed < speed_min(mddev));
NeilBrown57afd892005-06-21 17:17:13 -07005383 if (sectors == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005384 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5385 goto out;
5386 }
NeilBrown57afd892005-06-21 17:17:13 -07005387
5388 if (!skipped) { /* actual IO requested */
5389 io_sectors += sectors;
5390 atomic_add(sectors, &mddev->recovery_active);
5391 }
5392
Linus Torvalds1da177e2005-04-16 15:20:36 -07005393 j += sectors;
5394 if (j>1) mddev->curr_resync = j;
NeilBrownff4e8d92006-07-10 04:44:16 -07005395 mddev->curr_mark_cnt = io_sectors;
NeilBrownd7603b72006-01-06 00:20:30 -08005396 if (last_check == 0)
5397 /* this is the earliers that rebuilt will be
5398 * visible in /proc/mdstat
5399 */
5400 md_new_event(mddev);
NeilBrown57afd892005-06-21 17:17:13 -07005401
5402 if (last_check + window > io_sectors || j == max_sectors)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005403 continue;
5404
NeilBrown57afd892005-06-21 17:17:13 -07005405 last_check = io_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005406
5407 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5408 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5409 break;
5410
5411 repeat:
5412 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5413 /* step marks */
5414 int next = (last_mark+1) % SYNC_MARKS;
5415
5416 mddev->resync_mark = mark[next];
5417 mddev->resync_mark_cnt = mark_cnt[next];
5418 mark[next] = jiffies;
NeilBrown57afd892005-06-21 17:17:13 -07005419 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005420 last_mark = next;
5421 }
5422
5423
NeilBrown787453c2005-11-08 21:39:43 -08005424 if (kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005425 /*
5426 * got a signal, exit.
5427 */
5428 printk(KERN_INFO
5429 "md: md_do_sync() got signal ... exiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005430 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5431 goto out;
5432 }
5433
5434 /*
5435 * this loop exits only if either when we are slower than
5436 * the 'hard' speed limit, or the system was IO-idle for
5437 * a jiffy.
5438 * the system might be non-idle CPU-wise, but we only care
5439 * about not overloading the IO subsystem. (things like an
5440 * e2fsck being done on the RAID array should execute fast)
5441 */
5442 mddev->queue->unplug_fn(mddev->queue);
5443 cond_resched();
5444
NeilBrown57afd892005-06-21 17:17:13 -07005445 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5446 /((jiffies-mddev->resync_mark)/HZ +1) +1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005447
NeilBrown88202a02006-01-06 00:21:36 -08005448 if (currspeed > speed_min(mddev)) {
5449 if ((currspeed > speed_max(mddev)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07005450 !is_mddev_idle(mddev)) {
NeilBrownc0e48522005-11-18 01:11:01 -08005451 msleep(500);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005452 goto repeat;
5453 }
5454 }
5455 }
NeilBrown61df9d92006-10-03 01:15:57 -07005456 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005457 /*
5458 * this also signals 'finished resyncing' to md_stop
5459 */
5460 out:
5461 mddev->queue->unplug_fn(mddev->queue);
5462
5463 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5464
5465 /* tell personality that we are finished */
NeilBrown57afd892005-06-21 17:17:13 -07005466 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005467
5468 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
NeilBrownccfcc3c2006-03-27 01:18:09 -08005469 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005470 mddev->curr_resync > 2) {
5471 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5472 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5473 if (mddev->curr_resync >= mddev->recovery_cp) {
5474 printk(KERN_INFO
NeilBrown61df9d92006-10-03 01:15:57 -07005475 "md: checkpointing %s of %s.\n",
5476 desc, mdname(mddev));
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005477 mddev->recovery_cp = mddev->curr_resync;
5478 }
5479 } else
5480 mddev->recovery_cp = MaxSector;
5481 } else {
5482 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5483 mddev->curr_resync = MaxSector;
5484 ITERATE_RDEV(mddev,rdev,rtmp)
5485 if (rdev->raid_disk >= 0 &&
5486 !test_bit(Faulty, &rdev->flags) &&
5487 !test_bit(In_sync, &rdev->flags) &&
5488 rdev->recovery_offset < mddev->curr_resync)
5489 rdev->recovery_offset = mddev->curr_resync;
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005490 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005491 }
NeilBrown17571282006-12-10 02:20:52 -08005492 set_bit(MD_CHANGE_DEVS, &mddev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005493
Linus Torvalds1da177e2005-04-16 15:20:36 -07005494 skip:
5495 mddev->curr_resync = 0;
5496 wake_up(&resync_wait);
5497 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5498 md_wakeup_thread(mddev->thread);
5499}
NeilBrown29269552006-03-27 01:18:10 -08005500EXPORT_SYMBOL_GPL(md_do_sync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005501
5502
NeilBrownb4c4c7b2007-02-28 20:11:48 -08005503static int remove_and_add_spares(mddev_t *mddev)
5504{
5505 mdk_rdev_t *rdev;
5506 struct list_head *rtmp;
5507 int spares = 0;
5508
5509 ITERATE_RDEV(mddev,rdev,rtmp)
5510 if (rdev->raid_disk >= 0 &&
5511 (test_bit(Faulty, &rdev->flags) ||
5512 ! test_bit(In_sync, &rdev->flags)) &&
5513 atomic_read(&rdev->nr_pending)==0) {
5514 if (mddev->pers->hot_remove_disk(
5515 mddev, rdev->raid_disk)==0) {
5516 char nm[20];
5517 sprintf(nm,"rd%d", rdev->raid_disk);
5518 sysfs_remove_link(&mddev->kobj, nm);
5519 rdev->raid_disk = -1;
5520 }
5521 }
5522
5523 if (mddev->degraded) {
5524 ITERATE_RDEV(mddev,rdev,rtmp)
5525 if (rdev->raid_disk < 0
5526 && !test_bit(Faulty, &rdev->flags)) {
5527 rdev->recovery_offset = 0;
5528 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5529 char nm[20];
5530 sprintf(nm, "rd%d", rdev->raid_disk);
NeilBrown5e55e2f2007-03-26 21:32:14 -08005531 if (sysfs_create_link(&mddev->kobj,
5532 &rdev->kobj, nm))
5533 printk(KERN_WARNING
5534 "md: cannot register "
5535 "%s for %s\n",
5536 nm, mdname(mddev));
NeilBrownb4c4c7b2007-02-28 20:11:48 -08005537 spares++;
5538 md_new_event(mddev);
5539 } else
5540 break;
5541 }
5542 }
5543 return spares;
5544}
Linus Torvalds1da177e2005-04-16 15:20:36 -07005545/*
5546 * This routine is regularly called by all per-raid-array threads to
5547 * deal with generic issues like resync and super-block update.
5548 * Raid personalities that don't have a thread (linear/raid0) do not
5549 * need this as they never do any recovery or update the superblock.
5550 *
5551 * It does not do any resync itself, but rather "forks" off other threads
5552 * to do that as needed.
5553 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5554 * "->recovery" and create a thread at ->sync_thread.
5555 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5556 * and wakeups up this thread which will reap the thread and finish up.
5557 * This thread also removes any faulty devices (with nr_pending == 0).
5558 *
5559 * The overall approach is:
5560 * 1/ if the superblock needs updating, update it.
5561 * 2/ If a recovery thread is running, don't do anything else.
5562 * 3/ If recovery has finished, clean up, possibly marking spares active.
5563 * 4/ If there are any faulty devices, remove them.
5564 * 5/ If array is degraded, try to add spares devices
5565 * 6/ If array has spares or is not in-sync, start a resync thread.
5566 */
5567void md_check_recovery(mddev_t *mddev)
5568{
5569 mdk_rdev_t *rdev;
5570 struct list_head *rtmp;
5571
5572
NeilBrown5f404022005-06-21 17:17:16 -07005573 if (mddev->bitmap)
5574 bitmap_daemon_work(mddev->bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005575
5576 if (mddev->ro)
5577 return;
NeilBrownfca4d842005-06-21 17:17:11 -07005578
5579 if (signal_pending(current)) {
5580 if (mddev->pers->sync_request) {
5581 printk(KERN_INFO "md: %s in immediate safe mode\n",
5582 mdname(mddev));
5583 mddev->safemode = 2;
5584 }
5585 flush_signals(current);
5586 }
5587
Linus Torvalds1da177e2005-04-16 15:20:36 -07005588 if ( ! (
NeilBrown850b2b42006-10-03 01:15:46 -07005589 mddev->flags ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07005590 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
NeilBrownfca4d842005-06-21 17:17:11 -07005591 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5592 (mddev->safemode == 1) ||
5593 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5594 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005595 ))
5596 return;
NeilBrownfca4d842005-06-21 17:17:11 -07005597
NeilBrowndf5b89b2006-03-27 01:18:20 -08005598 if (mddev_trylock(mddev)) {
NeilBrownb4c4c7b2007-02-28 20:11:48 -08005599 int spares = 0;
NeilBrownfca4d842005-06-21 17:17:11 -07005600
NeilBrowna9701a32005-11-08 21:39:34 -08005601 spin_lock_irq(&mddev->write_lock);
NeilBrownfca4d842005-06-21 17:17:11 -07005602 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5603 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5604 mddev->in_sync = 1;
NeilBrown850b2b42006-10-03 01:15:46 -07005605 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
NeilBrownfca4d842005-06-21 17:17:11 -07005606 }
5607 if (mddev->safemode == 1)
5608 mddev->safemode = 0;
NeilBrowna9701a32005-11-08 21:39:34 -08005609 spin_unlock_irq(&mddev->write_lock);
NeilBrownfca4d842005-06-21 17:17:11 -07005610
NeilBrown850b2b42006-10-03 01:15:46 -07005611 if (mddev->flags)
5612 md_update_sb(mddev, 0);
NeilBrown06d91a52005-06-21 17:17:12 -07005613
NeilBrown06d91a52005-06-21 17:17:12 -07005614
Linus Torvalds1da177e2005-04-16 15:20:36 -07005615 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5616 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5617 /* resync/recovery still happening */
5618 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5619 goto unlock;
5620 }
5621 if (mddev->sync_thread) {
5622 /* resync has finished, collect result */
5623 md_unregister_thread(mddev->sync_thread);
5624 mddev->sync_thread = NULL;
5625 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5626 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5627 /* success...*/
5628 /* activate any spares */
5629 mddev->pers->spare_active(mddev);
5630 }
NeilBrown850b2b42006-10-03 01:15:46 -07005631 md_update_sb(mddev, 1);
NeilBrown41158c72005-06-21 17:17:25 -07005632
5633 /* if array is no-longer degraded, then any saved_raid_disk
5634 * information must be scrapped
5635 */
5636 if (!mddev->degraded)
5637 ITERATE_RDEV(mddev,rdev,rtmp)
5638 rdev->saved_raid_disk = -1;
5639
Linus Torvalds1da177e2005-04-16 15:20:36 -07005640 mddev->recovery = 0;
5641 /* flag recovery needed just to double check */
5642 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
NeilBrownd7603b72006-01-06 00:20:30 -08005643 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005644 goto unlock;
5645 }
NeilBrown24dd4692005-11-08 21:39:26 -08005646 /* Clear some bits that don't mean anything, but
5647 * might be left set
5648 */
5649 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5650 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5651 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5652 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005653
NeilBrown5fd6c1d2006-06-26 00:27:40 -07005654 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5655 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005656 /* no recovery is running.
5657 * remove any failed drives, then
5658 * add spares if possible.
5659 * Spare are also removed and re-added, to allow
5660 * the personality to fail the re-add.
5661 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005662
NeilBrownb4c4c7b2007-02-28 20:11:48 -08005663 if (mddev->reshape_position != MaxSector) {
5664 if (mddev->pers->check_reshape(mddev) != 0)
5665 /* Cannot proceed */
5666 goto unlock;
5667 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5668 } else if ((spares = remove_and_add_spares(mddev))) {
NeilBrown24dd4692005-11-08 21:39:26 -08005669 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5670 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5671 } else if (mddev->recovery_cp < MaxSector) {
5672 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5673 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5674 /* nothing to be done ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005675 goto unlock;
NeilBrown24dd4692005-11-08 21:39:26 -08005676
Linus Torvalds1da177e2005-04-16 15:20:36 -07005677 if (mddev->pers->sync_request) {
5678 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
NeilBrowna654b9d82005-06-21 17:17:27 -07005679 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5680 /* We are adding a device or devices to an array
5681 * which has the bitmap stored on all devices.
5682 * So make sure all bitmap pages get written
5683 */
5684 bitmap_write_all(mddev->bitmap);
5685 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005686 mddev->sync_thread = md_register_thread(md_do_sync,
5687 mddev,
5688 "%s_resync");
5689 if (!mddev->sync_thread) {
5690 printk(KERN_ERR "%s: could not start resync"
5691 " thread...\n",
5692 mdname(mddev));
5693 /* leave the spares where they are, it shouldn't hurt */
5694 mddev->recovery = 0;
NeilBrownd7603b72006-01-06 00:20:30 -08005695 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07005696 md_wakeup_thread(mddev->sync_thread);
NeilBrownd7603b72006-01-06 00:20:30 -08005697 md_new_event(mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005698 }
5699 unlock:
5700 mddev_unlock(mddev);
5701 }
5702}
5703
Adrian Bunk75c96f82005-05-05 16:16:09 -07005704static int md_notify_reboot(struct notifier_block *this,
5705 unsigned long code, void *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005706{
5707 struct list_head *tmp;
5708 mddev_t *mddev;
5709
5710 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5711
5712 printk(KERN_INFO "md: stopping all md devices.\n");
5713
5714 ITERATE_MDDEV(mddev,tmp)
Neil Brownc71d4882006-05-26 10:39:25 +10005715 if (mddev_trylock(mddev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005716 do_md_stop (mddev, 1);
Neil Brownc71d4882006-05-26 10:39:25 +10005717 mddev_unlock(mddev);
5718 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005719 /*
5720 * certain more exotic SCSI devices are known to be
5721 * volatile wrt too early system reboots. While the
5722 * right place to handle this issue is the given
5723 * driver, we do want to have a safe RAID driver ...
5724 */
5725 mdelay(1000*1);
5726 }
5727 return NOTIFY_DONE;
5728}
5729
Adrian Bunk75c96f82005-05-05 16:16:09 -07005730static struct notifier_block md_notifier = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005731 .notifier_call = md_notify_reboot,
5732 .next = NULL,
5733 .priority = INT_MAX, /* before any real devices */
5734};
5735
5736static void md_geninit(void)
5737{
5738 struct proc_dir_entry *p;
5739
5740 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5741
5742 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5743 if (p)
5744 p->proc_fops = &md_seq_fops;
5745}
5746
Adrian Bunk75c96f82005-05-05 16:16:09 -07005747static int __init md_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005748{
Linus Torvalds1da177e2005-04-16 15:20:36 -07005749 if (register_blkdev(MAJOR_NR, "md"))
5750 return -1;
5751 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5752 unregister_blkdev(MAJOR_NR, "md");
5753 return -1;
5754 }
NeilBrowne8703fe2006-10-03 01:15:59 -07005755 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5756 md_probe, NULL, NULL);
5757 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005758 md_probe, NULL, NULL);
5759
Linus Torvalds1da177e2005-04-16 15:20:36 -07005760 register_reboot_notifier(&md_notifier);
Eric W. Biederman0b4d4142007-02-14 00:34:09 -08005761 raid_table_header = register_sysctl_table(raid_root_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005762
5763 md_geninit();
5764 return (0);
5765}
5766
5767
5768#ifndef MODULE
5769
5770/*
5771 * Searches all registered partitions for autorun RAID arrays
5772 * at boot time.
5773 */
5774static dev_t detected_devices[128];
5775static int dev_cnt;
5776
5777void md_autodetect_dev(dev_t dev)
5778{
5779 if (dev_cnt >= 0 && dev_cnt < 127)
5780 detected_devices[dev_cnt++] = dev;
5781}
5782
5783
5784static void autostart_arrays(int part)
5785{
5786 mdk_rdev_t *rdev;
5787 int i;
5788
5789 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5790
5791 for (i = 0; i < dev_cnt; i++) {
5792 dev_t dev = detected_devices[i];
5793
NeilBrowndf968c42007-07-17 04:06:11 -07005794 rdev = md_import_device(dev,0, 90);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005795 if (IS_ERR(rdev))
5796 continue;
5797
NeilBrownb2d444d2005-11-08 21:39:31 -08005798 if (test_bit(Faulty, &rdev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005799 MD_BUG();
5800 continue;
5801 }
5802 list_add(&rdev->same_set, &pending_raid_disks);
5803 }
5804 dev_cnt = 0;
5805
5806 autorun_devices(part);
5807}
5808
Jeff Garzikfdee8ae2006-12-10 02:20:50 -08005809#endif /* !MODULE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005810
5811static __exit void md_exit(void)
5812{
5813 mddev_t *mddev;
5814 struct list_head *tmp;
Greg Kroah-Hartman8ab5e4c2005-06-20 21:15:16 -07005815
NeilBrowne8703fe2006-10-03 01:15:59 -07005816 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5817 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005818
5819 unregister_blkdev(MAJOR_NR,"md");
5820 unregister_blkdev(mdp_major, "mdp");
5821 unregister_reboot_notifier(&md_notifier);
5822 unregister_sysctl_table(raid_table_header);
5823 remove_proc_entry("mdstat", NULL);
5824 ITERATE_MDDEV(mddev,tmp) {
5825 struct gendisk *disk = mddev->gendisk;
5826 if (!disk)
5827 continue;
5828 export_array(mddev);
5829 del_gendisk(disk);
5830 put_disk(disk);
5831 mddev->gendisk = NULL;
5832 mddev_put(mddev);
5833 }
5834}
5835
Dan Williams685784a2007-07-09 11:56:42 -07005836subsys_initcall(md_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005837module_exit(md_exit)
5838
NeilBrownf91de922005-11-08 21:39:36 -08005839static int get_ro(char *buffer, struct kernel_param *kp)
5840{
5841 return sprintf(buffer, "%d", start_readonly);
5842}
5843static int set_ro(const char *val, struct kernel_param *kp)
5844{
5845 char *e;
5846 int num = simple_strtoul(val, &e, 10);
5847 if (*val && (*e == '\0' || *e == '\n')) {
5848 start_readonly = num;
NeilBrown4dbcdc72006-01-06 00:20:52 -08005849 return 0;
NeilBrownf91de922005-11-08 21:39:36 -08005850 }
5851 return -EINVAL;
5852}
5853
NeilBrown80ca3a42006-07-10 04:44:18 -07005854module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5855module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
NeilBrown6ff8d8ec2006-01-06 00:20:15 -08005856
NeilBrownf91de922005-11-08 21:39:36 -08005857
Linus Torvalds1da177e2005-04-16 15:20:36 -07005858EXPORT_SYMBOL(register_md_personality);
5859EXPORT_SYMBOL(unregister_md_personality);
5860EXPORT_SYMBOL(md_error);
5861EXPORT_SYMBOL(md_done_sync);
5862EXPORT_SYMBOL(md_write_start);
5863EXPORT_SYMBOL(md_write_end);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005864EXPORT_SYMBOL(md_register_thread);
5865EXPORT_SYMBOL(md_unregister_thread);
5866EXPORT_SYMBOL(md_wakeup_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005867EXPORT_SYMBOL(md_check_recovery);
5868MODULE_LICENSE("GPL");
NeilBrownaa1595e2005-08-04 12:53:32 -07005869MODULE_ALIAS("md");
NeilBrown72008652005-08-26 18:34:15 -07005870MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);