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[PATCH] md: Don't write dirty/clean update to spares - leave them alone
[linux-2.6/libata-dev.git] / drivers / md / md.c
blob34b6902cda467ae88f63618203c2d91af8a0fe8a
1 /*
2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
4
5 completely rewritten, based on the MD driver code from Marc Zyngier
6
7 Changes:
8
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
16
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
19
20 Neil Brown <neilb@cse.unsw.edu.au>.
21
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33 */
34
35 #include <linux/module.h>
36 #include <linux/config.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
45 #include <linux/poll.h>
46 #include <linux/mutex.h>
47 #include <linux/ctype.h>
48
49 #include <linux/init.h>
50
51 #include <linux/file.h>
52
53 #ifdef CONFIG_KMOD
54 #include <linux/kmod.h>
55 #endif
56
57 #include <asm/unaligned.h>
58
59 #define MAJOR_NR MD_MAJOR
60 #define MD_DRIVER
61
62 /* 63 partitions with the alternate major number (mdp) */
63 #define MdpMinorShift 6
64
65 #define DEBUG 0
66 #define dprintk(x...) ((void)(DEBUG && printk(x)))
67
68
69 #ifndef MODULE
70 static void autostart_arrays (int part);
71 #endif
72
73 static LIST_HEAD(pers_list);
74 static DEFINE_SPINLOCK(pers_lock);
75
76 static void md_print_devices(void);
77
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
79
80 /*
81 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
82 * is 1000 KB/sec, so the extra system load does not show up that much.
83 * Increase it if you want to have more _guaranteed_ speed. Note that
84 * the RAID driver will use the maximum available bandwidth if the IO
85 * subsystem is idle. There is also an 'absolute maximum' reconstruction
86 * speed limit - in case reconstruction slows down your system despite
87 * idle IO detection.
88 *
89 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
90 * or /sys/block/mdX/md/sync_speed_{min,max}
91 */
92
93 static int sysctl_speed_limit_min = 1000;
94 static int sysctl_speed_limit_max = 200000;
95 static inline int speed_min(mddev_t *mddev)
96 {
97 return mddev->sync_speed_min ?
98 mddev->sync_speed_min : sysctl_speed_limit_min;
99 }
100
101 static inline int speed_max(mddev_t *mddev)
102 {
103 return mddev->sync_speed_max ?
104 mddev->sync_speed_max : sysctl_speed_limit_max;
105 }
106
107 static struct ctl_table_header *raid_table_header;
108
109 static ctl_table raid_table[] = {
110 {
111 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
115 .mode = 0644,
116 .proc_handler = &proc_dointvec,
117 },
118 {
119 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
120 .procname = "speed_limit_max",
121 .data = &sysctl_speed_limit_max,
122 .maxlen = sizeof(int),
123 .mode = 0644,
124 .proc_handler = &proc_dointvec,
125 },
126 { .ctl_name = 0 }
127 };
128
129 static ctl_table raid_dir_table[] = {
130 {
131 .ctl_name = DEV_RAID,
132 .procname = "raid",
133 .maxlen = 0,
134 .mode = 0555,
135 .child = raid_table,
136 },
137 { .ctl_name = 0 }
138 };
139
140 static ctl_table raid_root_table[] = {
141 {
142 .ctl_name = CTL_DEV,
143 .procname = "dev",
144 .maxlen = 0,
145 .mode = 0555,
146 .child = raid_dir_table,
147 },
148 { .ctl_name = 0 }
149 };
150
151 static struct block_device_operations md_fops;
152
153 static int start_readonly;
154
155 /*
156 * We have a system wide 'event count' that is incremented
157 * on any 'interesting' event, and readers of /proc/mdstat
158 * can use 'poll' or 'select' to find out when the event
159 * count increases.
160 *
161 * Events are:
162 * start array, stop array, error, add device, remove device,
163 * start build, activate spare
164 */
165 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
166 static atomic_t md_event_count;
167 void md_new_event(mddev_t *mddev)
168 {
169 atomic_inc(&md_event_count);
170 wake_up(&md_event_waiters);
171 sysfs_notify(&mddev->kobj, NULL, "sync_action");
172 }
173 EXPORT_SYMBOL_GPL(md_new_event);
174
175 /* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
177 */
178 void md_new_event_inintr(mddev_t *mddev)
179 {
180 atomic_inc(&md_event_count);
181 wake_up(&md_event_waiters);
182 }
183
184 /*
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
187 */
188 static LIST_HEAD(all_mddevs);
189 static DEFINE_SPINLOCK(all_mddevs_lock);
190
191
192 /*
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
198 */
199 #define ITERATE_MDDEV(mddev,tmp) \
200 \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
203 mddev = NULL;}); \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
211 tmp = tmp->next;}) \
212 )
213
214
215 static int md_fail_request (request_queue_t *q, struct bio *bio)
216 {
217 bio_io_error(bio, bio->bi_size);
218 return 0;
219 }
220
221 static inline mddev_t *mddev_get(mddev_t *mddev)
222 {
223 atomic_inc(&mddev->active);
224 return mddev;
225 }
226
227 static void mddev_put(mddev_t *mddev)
228 {
229 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
230 return;
231 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
232 list_del(&mddev->all_mddevs);
233 spin_unlock(&all_mddevs_lock);
234 blk_cleanup_queue(mddev->queue);
235 kobject_unregister(&mddev->kobj);
236 } else
237 spin_unlock(&all_mddevs_lock);
238 }
239
240 static mddev_t * mddev_find(dev_t unit)
241 {
242 mddev_t *mddev, *new = NULL;
243
244 retry:
245 spin_lock(&all_mddevs_lock);
246 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
247 if (mddev->unit == unit) {
248 mddev_get(mddev);
249 spin_unlock(&all_mddevs_lock);
250 kfree(new);
251 return mddev;
252 }
253
254 if (new) {
255 list_add(&new->all_mddevs, &all_mddevs);
256 spin_unlock(&all_mddevs_lock);
257 return new;
258 }
259 spin_unlock(&all_mddevs_lock);
260
261 new = kzalloc(sizeof(*new), GFP_KERNEL);
262 if (!new)
263 return NULL;
264
265 new->unit = unit;
266 if (MAJOR(unit) == MD_MAJOR)
267 new->md_minor = MINOR(unit);
268 else
269 new->md_minor = MINOR(unit) >> MdpMinorShift;
270
271 mutex_init(&new->reconfig_mutex);
272 INIT_LIST_HEAD(&new->disks);
273 INIT_LIST_HEAD(&new->all_mddevs);
274 init_timer(&new->safemode_timer);
275 atomic_set(&new->active, 1);
276 spin_lock_init(&new->write_lock);
277 init_waitqueue_head(&new->sb_wait);
278
279 new->queue = blk_alloc_queue(GFP_KERNEL);
280 if (!new->queue) {
281 kfree(new);
282 return NULL;
283 }
284 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
285
286 blk_queue_make_request(new->queue, md_fail_request);
287
288 goto retry;
289 }
290
291 static inline int mddev_lock(mddev_t * mddev)
292 {
293 return mutex_lock_interruptible(&mddev->reconfig_mutex);
294 }
295
296 static inline int mddev_trylock(mddev_t * mddev)
297 {
298 return mutex_trylock(&mddev->reconfig_mutex);
299 }
300
301 static inline void mddev_unlock(mddev_t * mddev)
302 {
303 mutex_unlock(&mddev->reconfig_mutex);
304
305 md_wakeup_thread(mddev->thread);
306 }
307
308 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
309 {
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
320 static 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
332 static struct mdk_personality *find_pers(int level, char *clevel)
333 {
334 struct mdk_personality *pers;
335 list_for_each_entry(pers, &pers_list, list) {
336 if (level != LEVEL_NONE && pers->level == level)
337 return pers;
338 if (strcmp(pers->name, clevel)==0)
339 return pers;
340 }
341 return NULL;
342 }
343
344 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
345 {
346 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
347 return MD_NEW_SIZE_BLOCKS(size);
348 }
349
350 static 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
361 static 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
375 static void free_disk_sb(mdk_rdev_t * rdev)
376 {
377 if (rdev->sb_page) {
378 put_page(rdev->sb_page);
379 rdev->sb_loaded = 0;
380 rdev->sb_page = NULL;
381 rdev->sb_offset = 0;
382 rdev->size = 0;
383 }
384 }
385
386
387 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
388 {
389 mdk_rdev_t *rdev = bio->bi_private;
390 mddev_t *mddev = rdev->mddev;
391 if (bio->bi_size)
392 return 1;
393
394 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
395 md_error(mddev, rdev);
396
397 if (atomic_dec_and_test(&mddev->pending_writes))
398 wake_up(&mddev->sb_wait);
399 bio_put(bio);
400 return 0;
401 }
402
403 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
404 {
405 struct bio *bio2 = bio->bi_private;
406 mdk_rdev_t *rdev = bio2->bi_private;
407 mddev_t *mddev = rdev->mddev;
408 if (bio->bi_size)
409 return 1;
410
411 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
412 error == -EOPNOTSUPP) {
413 unsigned long flags;
414 /* barriers don't appear to be supported :-( */
415 set_bit(BarriersNotsupp, &rdev->flags);
416 mddev->barriers_work = 0;
417 spin_lock_irqsave(&mddev->write_lock, flags);
418 bio2->bi_next = mddev->biolist;
419 mddev->biolist = bio2;
420 spin_unlock_irqrestore(&mddev->write_lock, flags);
421 wake_up(&mddev->sb_wait);
422 bio_put(bio);
423 return 0;
424 }
425 bio_put(bio2);
426 bio->bi_private = rdev;
427 return super_written(bio, bytes_done, error);
428 }
429
430 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
431 sector_t sector, int size, struct page *page)
432 {
433 /* write first size bytes of page to sector of rdev
434 * Increment mddev->pending_writes before returning
435 * and decrement it on completion, waking up sb_wait
436 * if zero is reached.
437 * If an error occurred, call md_error
438 *
439 * As we might need to resubmit the request if BIO_RW_BARRIER
440 * causes ENOTSUPP, we allocate a spare bio...
441 */
442 struct bio *bio = bio_alloc(GFP_NOIO, 1);
443 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
444
445 bio->bi_bdev = rdev->bdev;
446 bio->bi_sector = sector;
447 bio_add_page(bio, page, size, 0);
448 bio->bi_private = rdev;
449 bio->bi_end_io = super_written;
450 bio->bi_rw = rw;
451
452 atomic_inc(&mddev->pending_writes);
453 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
454 struct bio *rbio;
455 rw |= (1<<BIO_RW_BARRIER);
456 rbio = bio_clone(bio, GFP_NOIO);
457 rbio->bi_private = bio;
458 rbio->bi_end_io = super_written_barrier;
459 submit_bio(rw, rbio);
460 } else
461 submit_bio(rw, bio);
462 }
463
464 void md_super_wait(mddev_t *mddev)
465 {
466 /* wait for all superblock writes that were scheduled to complete.
467 * if any had to be retried (due to BARRIER problems), retry them
468 */
469 DEFINE_WAIT(wq);
470 for(;;) {
471 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
472 if (atomic_read(&mddev->pending_writes)==0)
473 break;
474 while (mddev->biolist) {
475 struct bio *bio;
476 spin_lock_irq(&mddev->write_lock);
477 bio = mddev->biolist;
478 mddev->biolist = bio->bi_next ;
479 bio->bi_next = NULL;
480 spin_unlock_irq(&mddev->write_lock);
481 submit_bio(bio->bi_rw, bio);
482 }
483 schedule();
484 }
485 finish_wait(&mddev->sb_wait, &wq);
486 }
487
488 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
489 {
490 if (bio->bi_size)
491 return 1;
492
493 complete((struct completion*)bio->bi_private);
494 return 0;
495 }
496
497 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
498 struct page *page, int rw)
499 {
500 struct bio *bio = bio_alloc(GFP_NOIO, 1);
501 struct completion event;
502 int ret;
503
504 rw |= (1 << BIO_RW_SYNC);
505
506 bio->bi_bdev = bdev;
507 bio->bi_sector = sector;
508 bio_add_page(bio, page, size, 0);
509 init_completion(&event);
510 bio->bi_private = &event;
511 bio->bi_end_io = bi_complete;
512 submit_bio(rw, bio);
513 wait_for_completion(&event);
514
515 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
516 bio_put(bio);
517 return ret;
518 }
519 EXPORT_SYMBOL_GPL(sync_page_io);
520
521 static int read_disk_sb(mdk_rdev_t * rdev, int size)
522 {
523 char b[BDEVNAME_SIZE];
524 if (!rdev->sb_page) {
525 MD_BUG();
526 return -EINVAL;
527 }
528 if (rdev->sb_loaded)
529 return 0;
530
531
532 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
533 goto fail;
534 rdev->sb_loaded = 1;
535 return 0;
536
537 fail:
538 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
539 bdevname(rdev->bdev,b));
540 return -EINVAL;
541 }
542
543 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
544 {
545 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
546 (sb1->set_uuid1 == sb2->set_uuid1) &&
547 (sb1->set_uuid2 == sb2->set_uuid2) &&
548 (sb1->set_uuid3 == sb2->set_uuid3))
549
550 return 1;
551
552 return 0;
553 }
554
555
556 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
557 {
558 int ret;
559 mdp_super_t *tmp1, *tmp2;
560
561 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
562 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
563
564 if (!tmp1 || !tmp2) {
565 ret = 0;
566 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
567 goto abort;
568 }
569
570 *tmp1 = *sb1;
571 *tmp2 = *sb2;
572
573 /*
574 * nr_disks is not constant
575 */
576 tmp1->nr_disks = 0;
577 tmp2->nr_disks = 0;
578
579 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
580 ret = 0;
581 else
582 ret = 1;
583
584 abort:
585 kfree(tmp1);
586 kfree(tmp2);
587 return ret;
588 }
589
590 static unsigned int calc_sb_csum(mdp_super_t * sb)
591 {
592 unsigned int disk_csum, csum;
593
594 disk_csum = sb->sb_csum;
595 sb->sb_csum = 0;
596 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
597 sb->sb_csum = disk_csum;
598 return csum;
599 }
600
601
602 /*
603 * Handle superblock details.
604 * We want to be able to handle multiple superblock formats
605 * so we have a common interface to them all, and an array of
606 * different handlers.
607 * We rely on user-space to write the initial superblock, and support
608 * reading and updating of superblocks.
609 * Interface methods are:
610 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
611 * loads and validates a superblock on dev.
612 * if refdev != NULL, compare superblocks on both devices
613 * Return:
614 * 0 - dev has a superblock that is compatible with refdev
615 * 1 - dev has a superblock that is compatible and newer than refdev
616 * so dev should be used as the refdev in future
617 * -EINVAL superblock incompatible or invalid
618 * -othererror e.g. -EIO
619 *
620 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
621 * Verify that dev is acceptable into mddev.
622 * The first time, mddev->raid_disks will be 0, and data from
623 * dev should be merged in. Subsequent calls check that dev
624 * is new enough. Return 0 or -EINVAL
625 *
626 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
627 * Update the superblock for rdev with data in mddev
628 * This does not write to disc.
629 *
630 */
631
632 struct super_type {
633 char *name;
634 struct module *owner;
635 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
636 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
637 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
638 };
639
640 /*
641 * load_super for 0.90.0
642 */
643 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
644 {
645 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
646 mdp_super_t *sb;
647 int ret;
648 sector_t sb_offset;
649
650 /*
651 * Calculate the position of the superblock,
652 * it's at the end of the disk.
653 *
654 * It also happens to be a multiple of 4Kb.
655 */
656 sb_offset = calc_dev_sboffset(rdev->bdev);
657 rdev->sb_offset = sb_offset;
658
659 ret = read_disk_sb(rdev, MD_SB_BYTES);
660 if (ret) return ret;
661
662 ret = -EINVAL;
663
664 bdevname(rdev->bdev, b);
665 sb = (mdp_super_t*)page_address(rdev->sb_page);
666
667 if (sb->md_magic != MD_SB_MAGIC) {
668 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
669 b);
670 goto abort;
671 }
672
673 if (sb->major_version != 0 ||
674 sb->minor_version < 90 ||
675 sb->minor_version > 91) {
676 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
677 sb->major_version, sb->minor_version,
678 b);
679 goto abort;
680 }
681
682 if (sb->raid_disks <= 0)
683 goto abort;
684
685 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
686 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
687 b);
688 goto abort;
689 }
690
691 rdev->preferred_minor = sb->md_minor;
692 rdev->data_offset = 0;
693 rdev->sb_size = MD_SB_BYTES;
694
695 if (sb->level == LEVEL_MULTIPATH)
696 rdev->desc_nr = -1;
697 else
698 rdev->desc_nr = sb->this_disk.number;
699
700 if (refdev == 0)
701 ret = 1;
702 else {
703 __u64 ev1, ev2;
704 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
705 if (!uuid_equal(refsb, sb)) {
706 printk(KERN_WARNING "md: %s has different UUID to %s\n",
707 b, bdevname(refdev->bdev,b2));
708 goto abort;
709 }
710 if (!sb_equal(refsb, sb)) {
711 printk(KERN_WARNING "md: %s has same UUID"
712 " but different superblock to %s\n",
713 b, bdevname(refdev->bdev, b2));
714 goto abort;
715 }
716 ev1 = md_event(sb);
717 ev2 = md_event(refsb);
718 if (ev1 > ev2)
719 ret = 1;
720 else
721 ret = 0;
722 }
723 rdev->size = calc_dev_size(rdev, sb->chunk_size);
724
725 if (rdev->size < sb->size && sb->level > 1)
726 /* "this cannot possibly happen" ... */
727 ret = -EINVAL;
728
729 abort:
730 return ret;
731 }
732
733 /*
734 * validate_super for 0.90.0
735 */
736 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
737 {
738 mdp_disk_t *desc;
739 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
740 __u64 ev1 = md_event(sb);
741
742 rdev->raid_disk = -1;
743 rdev->flags = 0;
744 if (mddev->raid_disks == 0) {
745 mddev->major_version = 0;
746 mddev->minor_version = sb->minor_version;
747 mddev->patch_version = sb->patch_version;
748 mddev->persistent = ! sb->not_persistent;
749 mddev->chunk_size = sb->chunk_size;
750 mddev->ctime = sb->ctime;
751 mddev->utime = sb->utime;
752 mddev->level = sb->level;
753 mddev->clevel[0] = 0;
754 mddev->layout = sb->layout;
755 mddev->raid_disks = sb->raid_disks;
756 mddev->size = sb->size;
757 mddev->events = ev1;
758 mddev->bitmap_offset = 0;
759 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
760
761 if (mddev->minor_version >= 91) {
762 mddev->reshape_position = sb->reshape_position;
763 mddev->delta_disks = sb->delta_disks;
764 mddev->new_level = sb->new_level;
765 mddev->new_layout = sb->new_layout;
766 mddev->new_chunk = sb->new_chunk;
767 } else {
768 mddev->reshape_position = MaxSector;
769 mddev->delta_disks = 0;
770 mddev->new_level = mddev->level;
771 mddev->new_layout = mddev->layout;
772 mddev->new_chunk = mddev->chunk_size;
773 }
774
775 if (sb->state & (1<<MD_SB_CLEAN))
776 mddev->recovery_cp = MaxSector;
777 else {
778 if (sb->events_hi == sb->cp_events_hi &&
779 sb->events_lo == sb->cp_events_lo) {
780 mddev->recovery_cp = sb->recovery_cp;
781 } else
782 mddev->recovery_cp = 0;
783 }
784
785 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
786 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
787 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
788 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
789
790 mddev->max_disks = MD_SB_DISKS;
791
792 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
793 mddev->bitmap_file == NULL) {
794 if (mddev->level != 1 && mddev->level != 4
795 && mddev->level != 5 && mddev->level != 6
796 && mddev->level != 10) {
797 /* FIXME use a better test */
798 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
799 return -EINVAL;
800 }
801 mddev->bitmap_offset = mddev->default_bitmap_offset;
802 }
803
804 } else if (mddev->pers == NULL) {
805 /* Insist on good event counter while assembling */
806 ++ev1;
807 if (ev1 < mddev->events)
808 return -EINVAL;
809 } else if (mddev->bitmap) {
810 /* if adding to array with a bitmap, then we can accept an
811 * older device ... but not too old.
812 */
813 if (ev1 < mddev->bitmap->events_cleared)
814 return 0;
815 } else {
816 if (ev1 < mddev->events)
817 /* just a hot-add of a new device, leave raid_disk at -1 */
818 return 0;
819 }
820
821 if (mddev->level != LEVEL_MULTIPATH) {
822 desc = sb->disks + rdev->desc_nr;
823
824 if (desc->state & (1<<MD_DISK_FAULTY))
825 set_bit(Faulty, &rdev->flags);
826 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
827 desc->raid_disk < mddev->raid_disks */) {
828 set_bit(In_sync, &rdev->flags);
829 rdev->raid_disk = desc->raid_disk;
830 }
831 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
832 set_bit(WriteMostly, &rdev->flags);
833 } else /* MULTIPATH are always insync */
834 set_bit(In_sync, &rdev->flags);
835 return 0;
836 }
837
838 /*
839 * sync_super for 0.90.0
840 */
841 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
842 {
843 mdp_super_t *sb;
844 struct list_head *tmp;
845 mdk_rdev_t *rdev2;
846 int next_spare = mddev->raid_disks;
847
848
849 /* make rdev->sb match mddev data..
850 *
851 * 1/ zero out disks
852 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
853 * 3/ any empty disks < next_spare become removed
854 *
855 * disks[0] gets initialised to REMOVED because
856 * we cannot be sure from other fields if it has
857 * been initialised or not.
858 */
859 int i;
860 int active=0, working=0,failed=0,spare=0,nr_disks=0;
861
862 rdev->sb_size = MD_SB_BYTES;
863
864 sb = (mdp_super_t*)page_address(rdev->sb_page);
865
866 memset(sb, 0, sizeof(*sb));
867
868 sb->md_magic = MD_SB_MAGIC;
869 sb->major_version = mddev->major_version;
870 sb->patch_version = mddev->patch_version;
871 sb->gvalid_words = 0; /* ignored */
872 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
873 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
874 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
875 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
876
877 sb->ctime = mddev->ctime;
878 sb->level = mddev->level;
879 sb->size = mddev->size;
880 sb->raid_disks = mddev->raid_disks;
881 sb->md_minor = mddev->md_minor;
882 sb->not_persistent = !mddev->persistent;
883 sb->utime = mddev->utime;
884 sb->state = 0;
885 sb->events_hi = (mddev->events>>32);
886 sb->events_lo = (u32)mddev->events;
887
888 if (mddev->reshape_position == MaxSector)
889 sb->minor_version = 90;
890 else {
891 sb->minor_version = 91;
892 sb->reshape_position = mddev->reshape_position;
893 sb->new_level = mddev->new_level;
894 sb->delta_disks = mddev->delta_disks;
895 sb->new_layout = mddev->new_layout;
896 sb->new_chunk = mddev->new_chunk;
897 }
898 mddev->minor_version = sb->minor_version;
899 if (mddev->in_sync)
900 {
901 sb->recovery_cp = mddev->recovery_cp;
902 sb->cp_events_hi = (mddev->events>>32);
903 sb->cp_events_lo = (u32)mddev->events;
904 if (mddev->recovery_cp == MaxSector)
905 sb->state = (1<< MD_SB_CLEAN);
906 } else
907 sb->recovery_cp = 0;
908
909 sb->layout = mddev->layout;
910 sb->chunk_size = mddev->chunk_size;
911
912 if (mddev->bitmap && mddev->bitmap_file == NULL)
913 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
914
915 sb->disks[0].state = (1<<MD_DISK_REMOVED);
916 ITERATE_RDEV(mddev,rdev2,tmp) {
917 mdp_disk_t *d;
918 int desc_nr;
919 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
920 && !test_bit(Faulty, &rdev2->flags))
921 desc_nr = rdev2->raid_disk;
922 else
923 desc_nr = next_spare++;
924 rdev2->desc_nr = desc_nr;
925 d = &sb->disks[rdev2->desc_nr];
926 nr_disks++;
927 d->number = rdev2->desc_nr;
928 d->major = MAJOR(rdev2->bdev->bd_dev);
929 d->minor = MINOR(rdev2->bdev->bd_dev);
930 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
931 && !test_bit(Faulty, &rdev2->flags))
932 d->raid_disk = rdev2->raid_disk;
933 else
934 d->raid_disk = rdev2->desc_nr; /* compatibility */
935 if (test_bit(Faulty, &rdev2->flags))
936 d->state = (1<<MD_DISK_FAULTY);
937 else if (test_bit(In_sync, &rdev2->flags)) {
938 d->state = (1<<MD_DISK_ACTIVE);
939 d->state |= (1<<MD_DISK_SYNC);
940 active++;
941 working++;
942 } else {
943 d->state = 0;
944 spare++;
945 working++;
946 }
947 if (test_bit(WriteMostly, &rdev2->flags))
948 d->state |= (1<<MD_DISK_WRITEMOSTLY);
949 }
950 /* now set the "removed" and "faulty" bits on any missing devices */
951 for (i=0 ; i < mddev->raid_disks ; i++) {
952 mdp_disk_t *d = &sb->disks[i];
953 if (d->state == 0 && d->number == 0) {
954 d->number = i;
955 d->raid_disk = i;
956 d->state = (1<<MD_DISK_REMOVED);
957 d->state |= (1<<MD_DISK_FAULTY);
958 failed++;
959 }
960 }
961 sb->nr_disks = nr_disks;
962 sb->active_disks = active;
963 sb->working_disks = working;
964 sb->failed_disks = failed;
965 sb->spare_disks = spare;
966
967 sb->this_disk = sb->disks[rdev->desc_nr];
968 sb->sb_csum = calc_sb_csum(sb);
969 }
970
971 /*
972 * version 1 superblock
973 */
974
975 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
976 {
977 unsigned int disk_csum, csum;
978 unsigned long long newcsum;
979 int size = 256 + le32_to_cpu(sb->max_dev)*2;
980 unsigned int *isuper = (unsigned int*)sb;
981 int i;
982
983 disk_csum = sb->sb_csum;
984 sb->sb_csum = 0;
985 newcsum = 0;
986 for (i=0; size>=4; size -= 4 )
987 newcsum += le32_to_cpu(*isuper++);
988
989 if (size == 2)
990 newcsum += le16_to_cpu(*(unsigned short*) isuper);
991
992 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
993 sb->sb_csum = disk_csum;
994 return cpu_to_le32(csum);
995 }
996
997 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
998 {
999 struct mdp_superblock_1 *sb;
1000 int ret;
1001 sector_t sb_offset;
1002 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1003 int bmask;
1004
1005 /*
1006 * Calculate the position of the superblock.
1007 * It is always aligned to a 4K boundary and
1008 * depeding on minor_version, it can be:
1009 * 0: At least 8K, but less than 12K, from end of device
1010 * 1: At start of device
1011 * 2: 4K from start of device.
1012 */
1013 switch(minor_version) {
1014 case 0:
1015 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1016 sb_offset -= 8*2;
1017 sb_offset &= ~(sector_t)(4*2-1);
1018 /* convert from sectors to K */
1019 sb_offset /= 2;
1020 break;
1021 case 1:
1022 sb_offset = 0;
1023 break;
1024 case 2:
1025 sb_offset = 4;
1026 break;
1027 default:
1028 return -EINVAL;
1029 }
1030 rdev->sb_offset = sb_offset;
1031
1032 /* superblock is rarely larger than 1K, but it can be larger,
1033 * and it is safe to read 4k, so we do that
1034 */
1035 ret = read_disk_sb(rdev, 4096);
1036 if (ret) return ret;
1037
1038
1039 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1040
1041 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1042 sb->major_version != cpu_to_le32(1) ||
1043 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1044 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1045 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1046 return -EINVAL;
1047
1048 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1049 printk("md: invalid superblock checksum on %s\n",
1050 bdevname(rdev->bdev,b));
1051 return -EINVAL;
1052 }
1053 if (le64_to_cpu(sb->data_size) < 10) {
1054 printk("md: data_size too small on %s\n",
1055 bdevname(rdev->bdev,b));
1056 return -EINVAL;
1057 }
1058 rdev->preferred_minor = 0xffff;
1059 rdev->data_offset = le64_to_cpu(sb->data_offset);
1060 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1061
1062 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1063 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1064 if (rdev->sb_size & bmask)
1065 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1066
1067 if (refdev == 0)
1068 ret = 1;
1069 else {
1070 __u64 ev1, ev2;
1071 struct mdp_superblock_1 *refsb =
1072 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1073
1074 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1075 sb->level != refsb->level ||
1076 sb->layout != refsb->layout ||
1077 sb->chunksize != refsb->chunksize) {
1078 printk(KERN_WARNING "md: %s has strangely different"
1079 " superblock to %s\n",
1080 bdevname(rdev->bdev,b),
1081 bdevname(refdev->bdev,b2));
1082 return -EINVAL;
1083 }
1084 ev1 = le64_to_cpu(sb->events);
1085 ev2 = le64_to_cpu(refsb->events);
1086
1087 if (ev1 > ev2)
1088 ret = 1;
1089 else
1090 ret = 0;
1091 }
1092 if (minor_version)
1093 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1094 else
1095 rdev->size = rdev->sb_offset;
1096 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1097 return -EINVAL;
1098 rdev->size = le64_to_cpu(sb->data_size)/2;
1099 if (le32_to_cpu(sb->chunksize))
1100 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1101
1102 if (le32_to_cpu(sb->size) > rdev->size*2)
1103 return -EINVAL;
1104 return ret;
1105 }
1106
1107 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1108 {
1109 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1110 __u64 ev1 = le64_to_cpu(sb->events);
1111
1112 rdev->raid_disk = -1;
1113 rdev->flags = 0;
1114 if (mddev->raid_disks == 0) {
1115 mddev->major_version = 1;
1116 mddev->patch_version = 0;
1117 mddev->persistent = 1;
1118 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1119 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1120 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1121 mddev->level = le32_to_cpu(sb->level);
1122 mddev->clevel[0] = 0;
1123 mddev->layout = le32_to_cpu(sb->layout);
1124 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1125 mddev->size = le64_to_cpu(sb->size)/2;
1126 mddev->events = ev1;
1127 mddev->bitmap_offset = 0;
1128 mddev->default_bitmap_offset = 1024 >> 9;
1129
1130 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1131 memcpy(mddev->uuid, sb->set_uuid, 16);
1132
1133 mddev->max_disks = (4096-256)/2;
1134
1135 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1136 mddev->bitmap_file == NULL ) {
1137 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1138 && mddev->level != 10) {
1139 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
1140 return -EINVAL;
1141 }
1142 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1143 }
1144 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1145 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1146 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1147 mddev->new_level = le32_to_cpu(sb->new_level);
1148 mddev->new_layout = le32_to_cpu(sb->new_layout);
1149 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1150 } else {
1151 mddev->reshape_position = MaxSector;
1152 mddev->delta_disks = 0;
1153 mddev->new_level = mddev->level;
1154 mddev->new_layout = mddev->layout;
1155 mddev->new_chunk = mddev->chunk_size;
1156 }
1157
1158 } else if (mddev->pers == NULL) {
1159 /* Insist of good event counter while assembling */
1160 ++ev1;
1161 if (ev1 < mddev->events)
1162 return -EINVAL;
1163 } else if (mddev->bitmap) {
1164 /* If adding to array with a bitmap, then we can accept an
1165 * older device, but not too old.
1166 */
1167 if (ev1 < mddev->bitmap->events_cleared)
1168 return 0;
1169 } else {
1170 if (ev1 < mddev->events)
1171 /* just a hot-add of a new device, leave raid_disk at -1 */
1172 return 0;
1173 }
1174 if (mddev->level != LEVEL_MULTIPATH) {
1175 int role;
1176 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1177 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1178 switch(role) {
1179 case 0xffff: /* spare */
1180 break;
1181 case 0xfffe: /* faulty */
1182 set_bit(Faulty, &rdev->flags);
1183 break;
1184 default:
1185 if ((le32_to_cpu(sb->feature_map) &
1186 MD_FEATURE_RECOVERY_OFFSET))
1187 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1188 else
1189 set_bit(In_sync, &rdev->flags);
1190 rdev->raid_disk = role;
1191 break;
1192 }
1193 if (sb->devflags & WriteMostly1)
1194 set_bit(WriteMostly, &rdev->flags);
1195 } else /* MULTIPATH are always insync */
1196 set_bit(In_sync, &rdev->flags);
1197
1198 return 0;
1199 }
1200
1201 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1202 {
1203 struct mdp_superblock_1 *sb;
1204 struct list_head *tmp;
1205 mdk_rdev_t *rdev2;
1206 int max_dev, i;
1207 /* make rdev->sb match mddev and rdev data. */
1208
1209 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1210
1211 sb->feature_map = 0;
1212 sb->pad0 = 0;
1213 sb->recovery_offset = cpu_to_le64(0);
1214 memset(sb->pad1, 0, sizeof(sb->pad1));
1215 memset(sb->pad2, 0, sizeof(sb->pad2));
1216 memset(sb->pad3, 0, sizeof(sb->pad3));
1217
1218 sb->utime = cpu_to_le64((__u64)mddev->utime);
1219 sb->events = cpu_to_le64(mddev->events);
1220 if (mddev->in_sync)
1221 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1222 else
1223 sb->resync_offset = cpu_to_le64(0);
1224
1225 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1226
1227 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1228 sb->size = cpu_to_le64(mddev->size<<1);
1229
1230 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1231 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1232 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1233 }
1234
1235 if (rdev->raid_disk >= 0 &&
1236 !test_bit(In_sync, &rdev->flags) &&
1237 rdev->recovery_offset > 0) {
1238 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1239 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1240 }
1241
1242 if (mddev->reshape_position != MaxSector) {
1243 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1244 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1245 sb->new_layout = cpu_to_le32(mddev->new_layout);
1246 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1247 sb->new_level = cpu_to_le32(mddev->new_level);
1248 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1249 }
1250
1251 max_dev = 0;
1252 ITERATE_RDEV(mddev,rdev2,tmp)
1253 if (rdev2->desc_nr+1 > max_dev)
1254 max_dev = rdev2->desc_nr+1;
1255
1256 sb->max_dev = cpu_to_le32(max_dev);
1257 for (i=0; i<max_dev;i++)
1258 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1259
1260 ITERATE_RDEV(mddev,rdev2,tmp) {
1261 i = rdev2->desc_nr;
1262 if (test_bit(Faulty, &rdev2->flags))
1263 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1264 else if (test_bit(In_sync, &rdev2->flags))
1265 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1266 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1267 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1268 else
1269 sb->dev_roles[i] = cpu_to_le16(0xffff);
1270 }
1271
1272 sb->sb_csum = calc_sb_1_csum(sb);
1273 }
1274
1275
1276 static struct super_type super_types[] = {
1277 [0] = {
1278 .name = "0.90.0",
1279 .owner = THIS_MODULE,
1280 .load_super = super_90_load,
1281 .validate_super = super_90_validate,
1282 .sync_super = super_90_sync,
1283 },
1284 [1] = {
1285 .name = "md-1",
1286 .owner = THIS_MODULE,
1287 .load_super = super_1_load,
1288 .validate_super = super_1_validate,
1289 .sync_super = super_1_sync,
1290 },
1291 };
1292
1293 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1294 {
1295 struct list_head *tmp;
1296 mdk_rdev_t *rdev;
1297
1298 ITERATE_RDEV(mddev,rdev,tmp)
1299 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1300 return rdev;
1301
1302 return NULL;
1303 }
1304
1305 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1306 {
1307 struct list_head *tmp;
1308 mdk_rdev_t *rdev;
1309
1310 ITERATE_RDEV(mddev1,rdev,tmp)
1311 if (match_dev_unit(mddev2, rdev))
1312 return 1;
1313
1314 return 0;
1315 }
1316
1317 static LIST_HEAD(pending_raid_disks);
1318
1319 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1320 {
1321 mdk_rdev_t *same_pdev;
1322 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1323 struct kobject *ko;
1324 char *s;
1325
1326 if (rdev->mddev) {
1327 MD_BUG();
1328 return -EINVAL;
1329 }
1330 /* make sure rdev->size exceeds mddev->size */
1331 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1332 if (mddev->pers)
1333 /* Cannot change size, so fail */
1334 return -ENOSPC;
1335 else
1336 mddev->size = rdev->size;
1337 }
1338 same_pdev = match_dev_unit(mddev, rdev);
1339 if (same_pdev)
1340 printk(KERN_WARNING
1341 "%s: WARNING: %s appears to be on the same physical"
1342 " disk as %s. True\n protection against single-disk"
1343 " failure might be compromised.\n",
1344 mdname(mddev), bdevname(rdev->bdev,b),
1345 bdevname(same_pdev->bdev,b2));
1346
1347 /* Verify rdev->desc_nr is unique.
1348 * If it is -1, assign a free number, else
1349 * check number is not in use
1350 */
1351 if (rdev->desc_nr < 0) {
1352 int choice = 0;
1353 if (mddev->pers) choice = mddev->raid_disks;
1354 while (find_rdev_nr(mddev, choice))
1355 choice++;
1356 rdev->desc_nr = choice;
1357 } else {
1358 if (find_rdev_nr(mddev, rdev->desc_nr))
1359 return -EBUSY;
1360 }
1361 bdevname(rdev->bdev,b);
1362 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1363 return -ENOMEM;
1364 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1365 *s = '!';
1366
1367 list_add(&rdev->same_set, &mddev->disks);
1368 rdev->mddev = mddev;
1369 printk(KERN_INFO "md: bind<%s>\n", b);
1370
1371 rdev->kobj.parent = &mddev->kobj;
1372 kobject_add(&rdev->kobj);
1373
1374 if (rdev->bdev->bd_part)
1375 ko = &rdev->bdev->bd_part->kobj;
1376 else
1377 ko = &rdev->bdev->bd_disk->kobj;
1378 sysfs_create_link(&rdev->kobj, ko, "block");
1379 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1380 return 0;
1381 }
1382
1383 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1384 {
1385 char b[BDEVNAME_SIZE];
1386 if (!rdev->mddev) {
1387 MD_BUG();
1388 return;
1389 }
1390 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1391 list_del_init(&rdev->same_set);
1392 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1393 rdev->mddev = NULL;
1394 sysfs_remove_link(&rdev->kobj, "block");
1395 kobject_del(&rdev->kobj);
1396 }
1397
1398 /*
1399 * prevent the device from being mounted, repartitioned or
1400 * otherwise reused by a RAID array (or any other kernel
1401 * subsystem), by bd_claiming the device.
1402 */
1403 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1404 {
1405 int err = 0;
1406 struct block_device *bdev;
1407 char b[BDEVNAME_SIZE];
1408
1409 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1410 if (IS_ERR(bdev)) {
1411 printk(KERN_ERR "md: could not open %s.\n",
1412 __bdevname(dev, b));
1413 return PTR_ERR(bdev);
1414 }
1415 err = bd_claim(bdev, rdev);
1416 if (err) {
1417 printk(KERN_ERR "md: could not bd_claim %s.\n",
1418 bdevname(bdev, b));
1419 blkdev_put(bdev);
1420 return err;
1421 }
1422 rdev->bdev = bdev;
1423 return err;
1424 }
1425
1426 static void unlock_rdev(mdk_rdev_t *rdev)
1427 {
1428 struct block_device *bdev = rdev->bdev;
1429 rdev->bdev = NULL;
1430 if (!bdev)
1431 MD_BUG();
1432 bd_release(bdev);
1433 blkdev_put(bdev);
1434 }
1435
1436 void md_autodetect_dev(dev_t dev);
1437
1438 static void export_rdev(mdk_rdev_t * rdev)
1439 {
1440 char b[BDEVNAME_SIZE];
1441 printk(KERN_INFO "md: export_rdev(%s)\n",
1442 bdevname(rdev->bdev,b));
1443 if (rdev->mddev)
1444 MD_BUG();
1445 free_disk_sb(rdev);
1446 list_del_init(&rdev->same_set);
1447 #ifndef MODULE
1448 md_autodetect_dev(rdev->bdev->bd_dev);
1449 #endif
1450 unlock_rdev(rdev);
1451 kobject_put(&rdev->kobj);
1452 }
1453
1454 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1455 {
1456 unbind_rdev_from_array(rdev);
1457 export_rdev(rdev);
1458 }
1459
1460 static void export_array(mddev_t *mddev)
1461 {
1462 struct list_head *tmp;
1463 mdk_rdev_t *rdev;
1464
1465 ITERATE_RDEV(mddev,rdev,tmp) {
1466 if (!rdev->mddev) {
1467 MD_BUG();
1468 continue;
1469 }
1470 kick_rdev_from_array(rdev);
1471 }
1472 if (!list_empty(&mddev->disks))
1473 MD_BUG();
1474 mddev->raid_disks = 0;
1475 mddev->major_version = 0;
1476 }
1477
1478 static void print_desc(mdp_disk_t *desc)
1479 {
1480 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1481 desc->major,desc->minor,desc->raid_disk,desc->state);
1482 }
1483
1484 static void print_sb(mdp_super_t *sb)
1485 {
1486 int i;
1487
1488 printk(KERN_INFO
1489 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1490 sb->major_version, sb->minor_version, sb->patch_version,
1491 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1492 sb->ctime);
1493 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1494 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1495 sb->md_minor, sb->layout, sb->chunk_size);
1496 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1497 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1498 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1499 sb->failed_disks, sb->spare_disks,
1500 sb->sb_csum, (unsigned long)sb->events_lo);
1501
1502 printk(KERN_INFO);
1503 for (i = 0; i < MD_SB_DISKS; i++) {
1504 mdp_disk_t *desc;
1505
1506 desc = sb->disks + i;
1507 if (desc->number || desc->major || desc->minor ||
1508 desc->raid_disk || (desc->state && (desc->state != 4))) {
1509 printk(" D %2d: ", i);
1510 print_desc(desc);
1511 }
1512 }
1513 printk(KERN_INFO "md: THIS: ");
1514 print_desc(&sb->this_disk);
1515
1516 }
1517
1518 static void print_rdev(mdk_rdev_t *rdev)
1519 {
1520 char b[BDEVNAME_SIZE];
1521 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1522 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1523 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1524 rdev->desc_nr);
1525 if (rdev->sb_loaded) {
1526 printk(KERN_INFO "md: rdev superblock:\n");
1527 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1528 } else
1529 printk(KERN_INFO "md: no rdev superblock!\n");
1530 }
1531
1532 static void md_print_devices(void)
1533 {
1534 struct list_head *tmp, *tmp2;
1535 mdk_rdev_t *rdev;
1536 mddev_t *mddev;
1537 char b[BDEVNAME_SIZE];
1538
1539 printk("\n");
1540 printk("md: **********************************\n");
1541 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1542 printk("md: **********************************\n");
1543 ITERATE_MDDEV(mddev,tmp) {
1544
1545 if (mddev->bitmap)
1546 bitmap_print_sb(mddev->bitmap);
1547 else
1548 printk("%s: ", mdname(mddev));
1549 ITERATE_RDEV(mddev,rdev,tmp2)
1550 printk("<%s>", bdevname(rdev->bdev,b));
1551 printk("\n");
1552
1553 ITERATE_RDEV(mddev,rdev,tmp2)
1554 print_rdev(rdev);
1555 }
1556 printk("md: **********************************\n");
1557 printk("\n");
1558 }
1559
1560
1561 static void sync_sbs(mddev_t * mddev, int nospares)
1562 {
1563 /* Update each superblock (in-memory image), but
1564 * if we are allowed to, skip spares which already
1565 * have the right event counter, or have one earlier
1566 * (which would mean they aren't being marked as dirty
1567 * with the rest of the array)
1568 */
1569 mdk_rdev_t *rdev;
1570 struct list_head *tmp;
1571
1572 ITERATE_RDEV(mddev,rdev,tmp) {
1573 if (rdev->sb_events == mddev->events ||
1574 (nospares &&
1575 rdev->raid_disk < 0 &&
1576 (rdev->sb_events&1)==0 &&
1577 rdev->sb_events+1 == mddev->events)) {
1578 /* Don't update this superblock */
1579 rdev->sb_loaded = 2;
1580 } else {
1581 super_types[mddev->major_version].
1582 sync_super(mddev, rdev);
1583 rdev->sb_loaded = 1;
1584 }
1585 }
1586 }
1587
1588 void md_update_sb(mddev_t * mddev)
1589 {
1590 int err;
1591 struct list_head *tmp;
1592 mdk_rdev_t *rdev;
1593 int sync_req;
1594 int nospares = 0;
1595
1596 repeat:
1597 spin_lock_irq(&mddev->write_lock);
1598 sync_req = mddev->in_sync;
1599 mddev->utime = get_seconds();
1600 if (mddev->sb_dirty == 3)
1601 /* just a clean<-> dirty transition, possibly leave spares alone,
1602 * though if events isn't the right even/odd, we will have to do
1603 * spares after all
1604 */
1605 nospares = 1;
1606
1607 /* If this is just a dirty<->clean transition, and the array is clean
1608 * and 'events' is odd, we can roll back to the previous clean state */
1609 if (mddev->sb_dirty == 3
1610 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1611 && (mddev->events & 1))
1612 mddev->events--;
1613 else {
1614 /* otherwise we have to go forward and ... */
1615 mddev->events ++;
1616 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1617 /* .. if the array isn't clean, insist on an odd 'events' */
1618 if ((mddev->events&1)==0) {
1619 mddev->events++;
1620 nospares = 0;
1621 }
1622 } else {
1623 /* otherwise insist on an even 'events' (for clean states) */
1624 if ((mddev->events&1)) {
1625 mddev->events++;
1626 nospares = 0;
1627 }
1628 }
1629 }
1630
1631 if (!mddev->events) {
1632 /*
1633 * oops, this 64-bit counter should never wrap.
1634 * Either we are in around ~1 trillion A.C., assuming
1635 * 1 reboot per second, or we have a bug:
1636 */
1637 MD_BUG();
1638 mddev->events --;
1639 }
1640 mddev->sb_dirty = 2;
1641 sync_sbs(mddev, nospares);
1642
1643 /*
1644 * do not write anything to disk if using
1645 * nonpersistent superblocks
1646 */
1647 if (!mddev->persistent) {
1648 mddev->sb_dirty = 0;
1649 spin_unlock_irq(&mddev->write_lock);
1650 wake_up(&mddev->sb_wait);
1651 return;
1652 }
1653 spin_unlock_irq(&mddev->write_lock);
1654
1655 dprintk(KERN_INFO
1656 "md: updating %s RAID superblock on device (in sync %d)\n",
1657 mdname(mddev),mddev->in_sync);
1658
1659 err = bitmap_update_sb(mddev->bitmap);
1660 ITERATE_RDEV(mddev,rdev,tmp) {
1661 char b[BDEVNAME_SIZE];
1662 dprintk(KERN_INFO "md: ");
1663 if (rdev->sb_loaded != 1)
1664 continue; /* no noise on spare devices */
1665 if (test_bit(Faulty, &rdev->flags))
1666 dprintk("(skipping faulty ");
1667
1668 dprintk("%s ", bdevname(rdev->bdev,b));
1669 if (!test_bit(Faulty, &rdev->flags)) {
1670 md_super_write(mddev,rdev,
1671 rdev->sb_offset<<1, rdev->sb_size,
1672 rdev->sb_page);
1673 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1674 bdevname(rdev->bdev,b),
1675 (unsigned long long)rdev->sb_offset);
1676 rdev->sb_events = mddev->events;
1677
1678 } else
1679 dprintk(")\n");
1680 if (mddev->level == LEVEL_MULTIPATH)
1681 /* only need to write one superblock... */
1682 break;
1683 }
1684 md_super_wait(mddev);
1685 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1686
1687 spin_lock_irq(&mddev->write_lock);
1688 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1689 /* have to write it out again */
1690 spin_unlock_irq(&mddev->write_lock);
1691 goto repeat;
1692 }
1693 mddev->sb_dirty = 0;
1694 spin_unlock_irq(&mddev->write_lock);
1695 wake_up(&mddev->sb_wait);
1696
1697 }
1698 EXPORT_SYMBOL_GPL(md_update_sb);
1699
1700 /* words written to sysfs files may, or my not, be \n terminated.
1701 * We want to accept with case. For this we use cmd_match.
1702 */
1703 static int cmd_match(const char *cmd, const char *str)
1704 {
1705 /* See if cmd, written into a sysfs file, matches
1706 * str. They must either be the same, or cmd can
1707 * have a trailing newline
1708 */
1709 while (*cmd && *str && *cmd == *str) {
1710 cmd++;
1711 str++;
1712 }
1713 if (*cmd == '\n')
1714 cmd++;
1715 if (*str || *cmd)
1716 return 0;
1717 return 1;
1718 }
1719
1720 struct rdev_sysfs_entry {
1721 struct attribute attr;
1722 ssize_t (*show)(mdk_rdev_t *, char *);
1723 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1724 };
1725
1726 static ssize_t
1727 state_show(mdk_rdev_t *rdev, char *page)
1728 {
1729 char *sep = "";
1730 int len=0;
1731
1732 if (test_bit(Faulty, &rdev->flags)) {
1733 len+= sprintf(page+len, "%sfaulty",sep);
1734 sep = ",";
1735 }
1736 if (test_bit(In_sync, &rdev->flags)) {
1737 len += sprintf(page+len, "%sin_sync",sep);
1738 sep = ",";
1739 }
1740 if (!test_bit(Faulty, &rdev->flags) &&
1741 !test_bit(In_sync, &rdev->flags)) {
1742 len += sprintf(page+len, "%sspare", sep);
1743 sep = ",";
1744 }
1745 return len+sprintf(page+len, "\n");
1746 }
1747
1748 static struct rdev_sysfs_entry
1749 rdev_state = __ATTR_RO(state);
1750
1751 static ssize_t
1752 super_show(mdk_rdev_t *rdev, char *page)
1753 {
1754 if (rdev->sb_loaded && rdev->sb_size) {
1755 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1756 return rdev->sb_size;
1757 } else
1758 return 0;
1759 }
1760 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1761
1762 static ssize_t
1763 errors_show(mdk_rdev_t *rdev, char *page)
1764 {
1765 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1766 }
1767
1768 static ssize_t
1769 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1770 {
1771 char *e;
1772 unsigned long n = simple_strtoul(buf, &e, 10);
1773 if (*buf && (*e == 0 || *e == '\n')) {
1774 atomic_set(&rdev->corrected_errors, n);
1775 return len;
1776 }
1777 return -EINVAL;
1778 }
1779 static struct rdev_sysfs_entry rdev_errors =
1780 __ATTR(errors, 0644, errors_show, errors_store);
1781
1782 static ssize_t
1783 slot_show(mdk_rdev_t *rdev, char *page)
1784 {
1785 if (rdev->raid_disk < 0)
1786 return sprintf(page, "none\n");
1787 else
1788 return sprintf(page, "%d\n", rdev->raid_disk);
1789 }
1790
1791 static ssize_t
1792 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1793 {
1794 char *e;
1795 int slot = simple_strtoul(buf, &e, 10);
1796 if (strncmp(buf, "none", 4)==0)
1797 slot = -1;
1798 else if (e==buf || (*e && *e!= '\n'))
1799 return -EINVAL;
1800 if (rdev->mddev->pers)
1801 /* Cannot set slot in active array (yet) */
1802 return -EBUSY;
1803 if (slot >= rdev->mddev->raid_disks)
1804 return -ENOSPC;
1805 rdev->raid_disk = slot;
1806 /* assume it is working */
1807 rdev->flags = 0;
1808 set_bit(In_sync, &rdev->flags);
1809 return len;
1810 }
1811
1812
1813 static struct rdev_sysfs_entry rdev_slot =
1814 __ATTR(slot, 0644, slot_show, slot_store);
1815
1816 static ssize_t
1817 offset_show(mdk_rdev_t *rdev, char *page)
1818 {
1819 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1820 }
1821
1822 static ssize_t
1823 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1824 {
1825 char *e;
1826 unsigned long long offset = simple_strtoull(buf, &e, 10);
1827 if (e==buf || (*e && *e != '\n'))
1828 return -EINVAL;
1829 if (rdev->mddev->pers)
1830 return -EBUSY;
1831 rdev->data_offset = offset;
1832 return len;
1833 }
1834
1835 static struct rdev_sysfs_entry rdev_offset =
1836 __ATTR(offset, 0644, offset_show, offset_store);
1837
1838 static ssize_t
1839 rdev_size_show(mdk_rdev_t *rdev, char *page)
1840 {
1841 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1842 }
1843
1844 static ssize_t
1845 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1846 {
1847 char *e;
1848 unsigned long long size = simple_strtoull(buf, &e, 10);
1849 if (e==buf || (*e && *e != '\n'))
1850 return -EINVAL;
1851 if (rdev->mddev->pers)
1852 return -EBUSY;
1853 rdev->size = size;
1854 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1855 rdev->mddev->size = size;
1856 return len;
1857 }
1858
1859 static struct rdev_sysfs_entry rdev_size =
1860 __ATTR(size, 0644, rdev_size_show, rdev_size_store);
1861
1862 static struct attribute *rdev_default_attrs[] = {
1863 &rdev_state.attr,
1864 &rdev_super.attr,
1865 &rdev_errors.attr,
1866 &rdev_slot.attr,
1867 &rdev_offset.attr,
1868 &rdev_size.attr,
1869 NULL,
1870 };
1871 static ssize_t
1872 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1873 {
1874 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1875 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1876
1877 if (!entry->show)
1878 return -EIO;
1879 return entry->show(rdev, page);
1880 }
1881
1882 static ssize_t
1883 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1884 const char *page, size_t length)
1885 {
1886 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1887 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1888
1889 if (!entry->store)
1890 return -EIO;
1891 return entry->store(rdev, page, length);
1892 }
1893
1894 static void rdev_free(struct kobject *ko)
1895 {
1896 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1897 kfree(rdev);
1898 }
1899 static struct sysfs_ops rdev_sysfs_ops = {
1900 .show = rdev_attr_show,
1901 .store = rdev_attr_store,
1902 };
1903 static struct kobj_type rdev_ktype = {
1904 .release = rdev_free,
1905 .sysfs_ops = &rdev_sysfs_ops,
1906 .default_attrs = rdev_default_attrs,
1907 };
1908
1909 /*
1910 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1911 *
1912 * mark the device faulty if:
1913 *
1914 * - the device is nonexistent (zero size)
1915 * - the device has no valid superblock
1916 *
1917 * a faulty rdev _never_ has rdev->sb set.
1918 */
1919 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1920 {
1921 char b[BDEVNAME_SIZE];
1922 int err;
1923 mdk_rdev_t *rdev;
1924 sector_t size;
1925
1926 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1927 if (!rdev) {
1928 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1929 return ERR_PTR(-ENOMEM);
1930 }
1931
1932 if ((err = alloc_disk_sb(rdev)))
1933 goto abort_free;
1934
1935 err = lock_rdev(rdev, newdev);
1936 if (err)
1937 goto abort_free;
1938
1939 rdev->kobj.parent = NULL;
1940 rdev->kobj.ktype = &rdev_ktype;
1941 kobject_init(&rdev->kobj);
1942
1943 rdev->desc_nr = -1;
1944 rdev->flags = 0;
1945 rdev->data_offset = 0;
1946 rdev->sb_events = 0;
1947 atomic_set(&rdev->nr_pending, 0);
1948 atomic_set(&rdev->read_errors, 0);
1949 atomic_set(&rdev->corrected_errors, 0);
1950
1951 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1952 if (!size) {
1953 printk(KERN_WARNING
1954 "md: %s has zero or unknown size, marking faulty!\n",
1955 bdevname(rdev->bdev,b));
1956 err = -EINVAL;
1957 goto abort_free;
1958 }
1959
1960 if (super_format >= 0) {
1961 err = super_types[super_format].
1962 load_super(rdev, NULL, super_minor);
1963 if (err == -EINVAL) {
1964 printk(KERN_WARNING
1965 "md: %s has invalid sb, not importing!\n",
1966 bdevname(rdev->bdev,b));
1967 goto abort_free;
1968 }
1969 if (err < 0) {
1970 printk(KERN_WARNING
1971 "md: could not read %s's sb, not importing!\n",
1972 bdevname(rdev->bdev,b));
1973 goto abort_free;
1974 }
1975 }
1976 INIT_LIST_HEAD(&rdev->same_set);
1977
1978 return rdev;
1979
1980 abort_free:
1981 if (rdev->sb_page) {
1982 if (rdev->bdev)
1983 unlock_rdev(rdev);
1984 free_disk_sb(rdev);
1985 }
1986 kfree(rdev);
1987 return ERR_PTR(err);
1988 }
1989
1990 /*
1991 * Check a full RAID array for plausibility
1992 */
1993
1994
1995 static void analyze_sbs(mddev_t * mddev)
1996 {
1997 int i;
1998 struct list_head *tmp;
1999 mdk_rdev_t *rdev, *freshest;
2000 char b[BDEVNAME_SIZE];
2001
2002 freshest = NULL;
2003 ITERATE_RDEV(mddev,rdev,tmp)
2004 switch (super_types[mddev->major_version].
2005 load_super(rdev, freshest, mddev->minor_version)) {
2006 case 1:
2007 freshest = rdev;
2008 break;
2009 case 0:
2010 break;
2011 default:
2012 printk( KERN_ERR \
2013 "md: fatal superblock inconsistency in %s"
2014 " -- removing from array\n",
2015 bdevname(rdev->bdev,b));
2016 kick_rdev_from_array(rdev);
2017 }
2018
2019
2020 super_types[mddev->major_version].
2021 validate_super(mddev, freshest);
2022
2023 i = 0;
2024 ITERATE_RDEV(mddev,rdev,tmp) {
2025 if (rdev != freshest)
2026 if (super_types[mddev->major_version].
2027 validate_super(mddev, rdev)) {
2028 printk(KERN_WARNING "md: kicking non-fresh %s"
2029 " from array!\n",
2030 bdevname(rdev->bdev,b));
2031 kick_rdev_from_array(rdev);
2032 continue;
2033 }
2034 if (mddev->level == LEVEL_MULTIPATH) {
2035 rdev->desc_nr = i++;
2036 rdev->raid_disk = rdev->desc_nr;
2037 set_bit(In_sync, &rdev->flags);
2038 }
2039 }
2040
2041
2042
2043 if (mddev->recovery_cp != MaxSector &&
2044 mddev->level >= 1)
2045 printk(KERN_ERR "md: %s: raid array is not clean"
2046 " -- starting background reconstruction\n",
2047 mdname(mddev));
2048
2049 }
2050
2051 static ssize_t
2052 safe_delay_show(mddev_t *mddev, char *page)
2053 {
2054 int msec = (mddev->safemode_delay*1000)/HZ;
2055 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2056 }
2057 static ssize_t
2058 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2059 {
2060 int scale=1;
2061 int dot=0;
2062 int i;
2063 unsigned long msec;
2064 char buf[30];
2065 char *e;
2066 /* remove a period, and count digits after it */
2067 if (len >= sizeof(buf))
2068 return -EINVAL;
2069 strlcpy(buf, cbuf, len);
2070 buf[len] = 0;
2071 for (i=0; i<len; i++) {
2072 if (dot) {
2073 if (isdigit(buf[i])) {
2074 buf[i-1] = buf[i];
2075 scale *= 10;
2076 }
2077 buf[i] = 0;
2078 } else if (buf[i] == '.') {
2079 dot=1;
2080 buf[i] = 0;
2081 }
2082 }
2083 msec = simple_strtoul(buf, &e, 10);
2084 if (e == buf || (*e && *e != '\n'))
2085 return -EINVAL;
2086 msec = (msec * 1000) / scale;
2087 if (msec == 0)
2088 mddev->safemode_delay = 0;
2089 else {
2090 mddev->safemode_delay = (msec*HZ)/1000;
2091 if (mddev->safemode_delay == 0)
2092 mddev->safemode_delay = 1;
2093 }
2094 return len;
2095 }
2096 static struct md_sysfs_entry md_safe_delay =
2097 __ATTR(safe_mode_delay, 0644,safe_delay_show, safe_delay_store);
2098
2099 static ssize_t
2100 level_show(mddev_t *mddev, char *page)
2101 {
2102 struct mdk_personality *p = mddev->pers;
2103 if (p)
2104 return sprintf(page, "%s\n", p->name);
2105 else if (mddev->clevel[0])
2106 return sprintf(page, "%s\n", mddev->clevel);
2107 else if (mddev->level != LEVEL_NONE)
2108 return sprintf(page, "%d\n", mddev->level);
2109 else
2110 return 0;
2111 }
2112
2113 static ssize_t
2114 level_store(mddev_t *mddev, const char *buf, size_t len)
2115 {
2116 int rv = len;
2117 if (mddev->pers)
2118 return -EBUSY;
2119 if (len == 0)
2120 return 0;
2121 if (len >= sizeof(mddev->clevel))
2122 return -ENOSPC;
2123 strncpy(mddev->clevel, buf, len);
2124 if (mddev->clevel[len-1] == '\n')
2125 len--;
2126 mddev->clevel[len] = 0;
2127 mddev->level = LEVEL_NONE;
2128 return rv;
2129 }
2130
2131 static struct md_sysfs_entry md_level =
2132 __ATTR(level, 0644, level_show, level_store);
2133
2134 static ssize_t
2135 raid_disks_show(mddev_t *mddev, char *page)
2136 {
2137 if (mddev->raid_disks == 0)
2138 return 0;
2139 return sprintf(page, "%d\n", mddev->raid_disks);
2140 }
2141
2142 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2143
2144 static ssize_t
2145 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2146 {
2147 /* can only set raid_disks if array is not yet active */
2148 char *e;
2149 int rv = 0;
2150 unsigned long n = simple_strtoul(buf, &e, 10);
2151
2152 if (!*buf || (*e && *e != '\n'))
2153 return -EINVAL;
2154
2155 if (mddev->pers)
2156 rv = update_raid_disks(mddev, n);
2157 else
2158 mddev->raid_disks = n;
2159 return rv ? rv : len;
2160 }
2161 static struct md_sysfs_entry md_raid_disks =
2162 __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
2163
2164 static ssize_t
2165 chunk_size_show(mddev_t *mddev, char *page)
2166 {
2167 return sprintf(page, "%d\n", mddev->chunk_size);
2168 }
2169
2170 static ssize_t
2171 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2172 {
2173 /* can only set chunk_size if array is not yet active */
2174 char *e;
2175 unsigned long n = simple_strtoul(buf, &e, 10);
2176
2177 if (mddev->pers)
2178 return -EBUSY;
2179 if (!*buf || (*e && *e != '\n'))
2180 return -EINVAL;
2181
2182 mddev->chunk_size = n;
2183 return len;
2184 }
2185 static struct md_sysfs_entry md_chunk_size =
2186 __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2187
2188 static ssize_t
2189 null_show(mddev_t *mddev, char *page)
2190 {
2191 return -EINVAL;
2192 }
2193
2194 static ssize_t
2195 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2196 {
2197 /* buf must be %d:%d\n? giving major and minor numbers */
2198 /* The new device is added to the array.
2199 * If the array has a persistent superblock, we read the
2200 * superblock to initialise info and check validity.
2201 * Otherwise, only checking done is that in bind_rdev_to_array,
2202 * which mainly checks size.
2203 */
2204 char *e;
2205 int major = simple_strtoul(buf, &e, 10);
2206 int minor;
2207 dev_t dev;
2208 mdk_rdev_t *rdev;
2209 int err;
2210
2211 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2212 return -EINVAL;
2213 minor = simple_strtoul(e+1, &e, 10);
2214 if (*e && *e != '\n')
2215 return -EINVAL;
2216 dev = MKDEV(major, minor);
2217 if (major != MAJOR(dev) ||
2218 minor != MINOR(dev))
2219 return -EOVERFLOW;
2220
2221
2222 if (mddev->persistent) {
2223 rdev = md_import_device(dev, mddev->major_version,
2224 mddev->minor_version);
2225 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2226 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2227 mdk_rdev_t, same_set);
2228 err = super_types[mddev->major_version]
2229 .load_super(rdev, rdev0, mddev->minor_version);
2230 if (err < 0)
2231 goto out;
2232 }
2233 } else
2234 rdev = md_import_device(dev, -1, -1);
2235
2236 if (IS_ERR(rdev))
2237 return PTR_ERR(rdev);
2238 err = bind_rdev_to_array(rdev, mddev);
2239 out:
2240 if (err)
2241 export_rdev(rdev);
2242 return err ? err : len;
2243 }
2244
2245 static struct md_sysfs_entry md_new_device =
2246 __ATTR(new_dev, 0200, null_show, new_dev_store);
2247
2248 static ssize_t
2249 size_show(mddev_t *mddev, char *page)
2250 {
2251 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2252 }
2253
2254 static int update_size(mddev_t *mddev, unsigned long size);
2255
2256 static ssize_t
2257 size_store(mddev_t *mddev, const char *buf, size_t len)
2258 {
2259 /* If array is inactive, we can reduce the component size, but
2260 * not increase it (except from 0).
2261 * If array is active, we can try an on-line resize
2262 */
2263 char *e;
2264 int err = 0;
2265 unsigned long long size = simple_strtoull(buf, &e, 10);
2266 if (!*buf || *buf == '\n' ||
2267 (*e && *e != '\n'))
2268 return -EINVAL;
2269
2270 if (mddev->pers) {
2271 err = update_size(mddev, size);
2272 md_update_sb(mddev);
2273 } else {
2274 if (mddev->size == 0 ||
2275 mddev->size > size)
2276 mddev->size = size;
2277 else
2278 err = -ENOSPC;
2279 }
2280 return err ? err : len;
2281 }
2282
2283 static struct md_sysfs_entry md_size =
2284 __ATTR(component_size, 0644, size_show, size_store);
2285
2286
2287 /* Metdata version.
2288 * This is either 'none' for arrays with externally managed metadata,
2289 * or N.M for internally known formats
2290 */
2291 static ssize_t
2292 metadata_show(mddev_t *mddev, char *page)
2293 {
2294 if (mddev->persistent)
2295 return sprintf(page, "%d.%d\n",
2296 mddev->major_version, mddev->minor_version);
2297 else
2298 return sprintf(page, "none\n");
2299 }
2300
2301 static ssize_t
2302 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2303 {
2304 int major, minor;
2305 char *e;
2306 if (!list_empty(&mddev->disks))
2307 return -EBUSY;
2308
2309 if (cmd_match(buf, "none")) {
2310 mddev->persistent = 0;
2311 mddev->major_version = 0;
2312 mddev->minor_version = 90;
2313 return len;
2314 }
2315 major = simple_strtoul(buf, &e, 10);
2316 if (e==buf || *e != '.')
2317 return -EINVAL;
2318 buf = e+1;
2319 minor = simple_strtoul(buf, &e, 10);
2320 if (e==buf || *e != '\n')
2321 return -EINVAL;
2322 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2323 super_types[major].name == NULL)
2324 return -ENOENT;
2325 mddev->major_version = major;
2326 mddev->minor_version = minor;
2327 mddev->persistent = 1;
2328 return len;
2329 }
2330
2331 static struct md_sysfs_entry md_metadata =
2332 __ATTR(metadata_version, 0644, metadata_show, metadata_store);
2333
2334 static ssize_t
2335 action_show(mddev_t *mddev, char *page)
2336 {
2337 char *type = "idle";
2338 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2339 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2340 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2341 type = "reshape";
2342 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2343 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2344 type = "resync";
2345 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2346 type = "check";
2347 else
2348 type = "repair";
2349 } else
2350 type = "recover";
2351 }
2352 return sprintf(page, "%s\n", type);
2353 }
2354
2355 static ssize_t
2356 action_store(mddev_t *mddev, const char *page, size_t len)
2357 {
2358 if (!mddev->pers || !mddev->pers->sync_request)
2359 return -EINVAL;
2360
2361 if (cmd_match(page, "idle")) {
2362 if (mddev->sync_thread) {
2363 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2364 md_unregister_thread(mddev->sync_thread);
2365 mddev->sync_thread = NULL;
2366 mddev->recovery = 0;
2367 }
2368 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2369 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2370 return -EBUSY;
2371 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2372 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2373 else if (cmd_match(page, "reshape")) {
2374 int err;
2375 if (mddev->pers->start_reshape == NULL)
2376 return -EINVAL;
2377 err = mddev->pers->start_reshape(mddev);
2378 if (err)
2379 return err;
2380 } else {
2381 if (cmd_match(page, "check"))
2382 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2383 else if (!cmd_match(page, "repair"))
2384 return -EINVAL;
2385 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2386 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2387 }
2388 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2389 md_wakeup_thread(mddev->thread);
2390 return len;
2391 }
2392
2393 static ssize_t
2394 mismatch_cnt_show(mddev_t *mddev, char *page)
2395 {
2396 return sprintf(page, "%llu\n",
2397 (unsigned long long) mddev->resync_mismatches);
2398 }
2399
2400 static struct md_sysfs_entry
2401 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2402
2403
2404 static struct md_sysfs_entry
2405 md_mismatches = __ATTR_RO(mismatch_cnt);
2406
2407 static ssize_t
2408 sync_min_show(mddev_t *mddev, char *page)
2409 {
2410 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2411 mddev->sync_speed_min ? "local": "system");
2412 }
2413
2414 static ssize_t
2415 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2416 {
2417 int min;
2418 char *e;
2419 if (strncmp(buf, "system", 6)==0) {
2420 mddev->sync_speed_min = 0;
2421 return len;
2422 }
2423 min = simple_strtoul(buf, &e, 10);
2424 if (buf == e || (*e && *e != '\n') || min <= 0)
2425 return -EINVAL;
2426 mddev->sync_speed_min = min;
2427 return len;
2428 }
2429
2430 static struct md_sysfs_entry md_sync_min =
2431 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2432
2433 static ssize_t
2434 sync_max_show(mddev_t *mddev, char *page)
2435 {
2436 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2437 mddev->sync_speed_max ? "local": "system");
2438 }
2439
2440 static ssize_t
2441 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2442 {
2443 int max;
2444 char *e;
2445 if (strncmp(buf, "system", 6)==0) {
2446 mddev->sync_speed_max = 0;
2447 return len;
2448 }
2449 max = simple_strtoul(buf, &e, 10);
2450 if (buf == e || (*e && *e != '\n') || max <= 0)
2451 return -EINVAL;
2452 mddev->sync_speed_max = max;
2453 return len;
2454 }
2455
2456 static struct md_sysfs_entry md_sync_max =
2457 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2458
2459
2460 static ssize_t
2461 sync_speed_show(mddev_t *mddev, char *page)
2462 {
2463 unsigned long resync, dt, db;
2464 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2465 dt = ((jiffies - mddev->resync_mark) / HZ);
2466 if (!dt) dt++;
2467 db = resync - (mddev->resync_mark_cnt);
2468 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2469 }
2470
2471 static struct md_sysfs_entry
2472 md_sync_speed = __ATTR_RO(sync_speed);
2473
2474 static ssize_t
2475 sync_completed_show(mddev_t *mddev, char *page)
2476 {
2477 unsigned long max_blocks, resync;
2478
2479 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2480 max_blocks = mddev->resync_max_sectors;
2481 else
2482 max_blocks = mddev->size << 1;
2483
2484 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2485 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2486 }
2487
2488 static struct md_sysfs_entry
2489 md_sync_completed = __ATTR_RO(sync_completed);
2490
2491 static ssize_t
2492 suspend_lo_show(mddev_t *mddev, char *page)
2493 {
2494 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2495 }
2496
2497 static ssize_t
2498 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2499 {
2500 char *e;
2501 unsigned long long new = simple_strtoull(buf, &e, 10);
2502
2503 if (mddev->pers->quiesce == NULL)
2504 return -EINVAL;
2505 if (buf == e || (*e && *e != '\n'))
2506 return -EINVAL;
2507 if (new >= mddev->suspend_hi ||
2508 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2509 mddev->suspend_lo = new;
2510 mddev->pers->quiesce(mddev, 2);
2511 return len;
2512 } else
2513 return -EINVAL;
2514 }
2515 static struct md_sysfs_entry md_suspend_lo =
2516 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2517
2518
2519 static ssize_t
2520 suspend_hi_show(mddev_t *mddev, char *page)
2521 {
2522 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2523 }
2524
2525 static ssize_t
2526 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2527 {
2528 char *e;
2529 unsigned long long new = simple_strtoull(buf, &e, 10);
2530
2531 if (mddev->pers->quiesce == NULL)
2532 return -EINVAL;
2533 if (buf == e || (*e && *e != '\n'))
2534 return -EINVAL;
2535 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2536 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2537 mddev->suspend_hi = new;
2538 mddev->pers->quiesce(mddev, 1);
2539 mddev->pers->quiesce(mddev, 0);
2540 return len;
2541 } else
2542 return -EINVAL;
2543 }
2544 static struct md_sysfs_entry md_suspend_hi =
2545 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2546
2547
2548 static struct attribute *md_default_attrs[] = {
2549 &md_level.attr,
2550 &md_raid_disks.attr,
2551 &md_chunk_size.attr,
2552 &md_size.attr,
2553 &md_metadata.attr,
2554 &md_new_device.attr,
2555 &md_safe_delay.attr,
2556 NULL,
2557 };
2558
2559 static struct attribute *md_redundancy_attrs[] = {
2560 &md_scan_mode.attr,
2561 &md_mismatches.attr,
2562 &md_sync_min.attr,
2563 &md_sync_max.attr,
2564 &md_sync_speed.attr,
2565 &md_sync_completed.attr,
2566 &md_suspend_lo.attr,
2567 &md_suspend_hi.attr,
2568 NULL,
2569 };
2570 static struct attribute_group md_redundancy_group = {
2571 .name = NULL,
2572 .attrs = md_redundancy_attrs,
2573 };
2574
2575
2576 static ssize_t
2577 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2578 {
2579 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2580 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2581 ssize_t rv;
2582
2583 if (!entry->show)
2584 return -EIO;
2585 rv = mddev_lock(mddev);
2586 if (!rv) {
2587 rv = entry->show(mddev, page);
2588 mddev_unlock(mddev);
2589 }
2590 return rv;
2591 }
2592
2593 static ssize_t
2594 md_attr_store(struct kobject *kobj, struct attribute *attr,
2595 const char *page, size_t length)
2596 {
2597 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2598 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2599 ssize_t rv;
2600
2601 if (!entry->store)
2602 return -EIO;
2603 rv = mddev_lock(mddev);
2604 if (!rv) {
2605 rv = entry->store(mddev, page, length);
2606 mddev_unlock(mddev);
2607 }
2608 return rv;
2609 }
2610
2611 static void md_free(struct kobject *ko)
2612 {
2613 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2614 kfree(mddev);
2615 }
2616
2617 static struct sysfs_ops md_sysfs_ops = {
2618 .show = md_attr_show,
2619 .store = md_attr_store,
2620 };
2621 static struct kobj_type md_ktype = {
2622 .release = md_free,
2623 .sysfs_ops = &md_sysfs_ops,
2624 .default_attrs = md_default_attrs,
2625 };
2626
2627 int mdp_major = 0;
2628
2629 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2630 {
2631 static DEFINE_MUTEX(disks_mutex);
2632 mddev_t *mddev = mddev_find(dev);
2633 struct gendisk *disk;
2634 int partitioned = (MAJOR(dev) != MD_MAJOR);
2635 int shift = partitioned ? MdpMinorShift : 0;
2636 int unit = MINOR(dev) >> shift;
2637
2638 if (!mddev)
2639 return NULL;
2640
2641 mutex_lock(&disks_mutex);
2642 if (mddev->gendisk) {
2643 mutex_unlock(&disks_mutex);
2644 mddev_put(mddev);
2645 return NULL;
2646 }
2647 disk = alloc_disk(1 << shift);
2648 if (!disk) {
2649 mutex_unlock(&disks_mutex);
2650 mddev_put(mddev);
2651 return NULL;
2652 }
2653 disk->major = MAJOR(dev);
2654 disk->first_minor = unit << shift;
2655 if (partitioned) {
2656 sprintf(disk->disk_name, "md_d%d", unit);
2657 sprintf(disk->devfs_name, "md/d%d", unit);
2658 } else {
2659 sprintf(disk->disk_name, "md%d", unit);
2660 sprintf(disk->devfs_name, "md/%d", unit);
2661 }
2662 disk->fops = &md_fops;
2663 disk->private_data = mddev;
2664 disk->queue = mddev->queue;
2665 add_disk(disk);
2666 mddev->gendisk = disk;
2667 mutex_unlock(&disks_mutex);
2668 mddev->kobj.parent = &disk->kobj;
2669 mddev->kobj.k_name = NULL;
2670 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2671 mddev->kobj.ktype = &md_ktype;
2672 kobject_register(&mddev->kobj);
2673 return NULL;
2674 }
2675
2676 static void md_safemode_timeout(unsigned long data)
2677 {
2678 mddev_t *mddev = (mddev_t *) data;
2679
2680 mddev->safemode = 1;
2681 md_wakeup_thread(mddev->thread);
2682 }
2683
2684 static int start_dirty_degraded;
2685
2686 static int do_md_run(mddev_t * mddev)
2687 {
2688 int err;
2689 int chunk_size;
2690 struct list_head *tmp;
2691 mdk_rdev_t *rdev;
2692 struct gendisk *disk;
2693 struct mdk_personality *pers;
2694 char b[BDEVNAME_SIZE];
2695
2696 if (list_empty(&mddev->disks))
2697 /* cannot run an array with no devices.. */
2698 return -EINVAL;
2699
2700 if (mddev->pers)
2701 return -EBUSY;
2702
2703 /*
2704 * Analyze all RAID superblock(s)
2705 */
2706 if (!mddev->raid_disks)
2707 analyze_sbs(mddev);
2708
2709 chunk_size = mddev->chunk_size;
2710
2711 if (chunk_size) {
2712 if (chunk_size > MAX_CHUNK_SIZE) {
2713 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2714 chunk_size, MAX_CHUNK_SIZE);
2715 return -EINVAL;
2716 }
2717 /*
2718 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2719 */
2720 if ( (1 << ffz(~chunk_size)) != chunk_size) {
2721 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
2722 return -EINVAL;
2723 }
2724 if (chunk_size < PAGE_SIZE) {
2725 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2726 chunk_size, PAGE_SIZE);
2727 return -EINVAL;
2728 }
2729
2730 /* devices must have minimum size of one chunk */
2731 ITERATE_RDEV(mddev,rdev,tmp) {
2732 if (test_bit(Faulty, &rdev->flags))
2733 continue;
2734 if (rdev->size < chunk_size / 1024) {
2735 printk(KERN_WARNING
2736 "md: Dev %s smaller than chunk_size:"
2737 " %lluk < %dk\n",
2738 bdevname(rdev->bdev,b),
2739 (unsigned long long)rdev->size,
2740 chunk_size / 1024);
2741 return -EINVAL;
2742 }
2743 }
2744 }
2745
2746 #ifdef CONFIG_KMOD
2747 if (mddev->level != LEVEL_NONE)
2748 request_module("md-level-%d", mddev->level);
2749 else if (mddev->clevel[0])
2750 request_module("md-%s", mddev->clevel);
2751 #endif
2752
2753 /*
2754 * Drop all container device buffers, from now on
2755 * the only valid external interface is through the md
2756 * device.
2757 * Also find largest hardsector size
2758 */
2759 ITERATE_RDEV(mddev,rdev,tmp) {
2760 if (test_bit(Faulty, &rdev->flags))
2761 continue;
2762 sync_blockdev(rdev->bdev);
2763 invalidate_bdev(rdev->bdev, 0);
2764 }
2765
2766 md_probe(mddev->unit, NULL, NULL);
2767 disk = mddev->gendisk;
2768 if (!disk)
2769 return -ENOMEM;
2770
2771 spin_lock(&pers_lock);
2772 pers = find_pers(mddev->level, mddev->clevel);
2773 if (!pers || !try_module_get(pers->owner)) {
2774 spin_unlock(&pers_lock);
2775 if (mddev->level != LEVEL_NONE)
2776 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2777 mddev->level);
2778 else
2779 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2780 mddev->clevel);
2781 return -EINVAL;
2782 }
2783 mddev->pers = pers;
2784 spin_unlock(&pers_lock);
2785 mddev->level = pers->level;
2786 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2787
2788 if (mddev->reshape_position != MaxSector &&
2789 pers->start_reshape == NULL) {
2790 /* This personality cannot handle reshaping... */
2791 mddev->pers = NULL;
2792 module_put(pers->owner);
2793 return -EINVAL;
2794 }
2795
2796 mddev->recovery = 0;
2797 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2798 mddev->barriers_work = 1;
2799 mddev->ok_start_degraded = start_dirty_degraded;
2800
2801 if (start_readonly)
2802 mddev->ro = 2; /* read-only, but switch on first write */
2803
2804 err = mddev->pers->run(mddev);
2805 if (!err && mddev->pers->sync_request) {
2806 err = bitmap_create(mddev);
2807 if (err) {
2808 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2809 mdname(mddev), err);
2810 mddev->pers->stop(mddev);
2811 }
2812 }
2813 if (err) {
2814 printk(KERN_ERR "md: pers->run() failed ...\n");
2815 module_put(mddev->pers->owner);
2816 mddev->pers = NULL;
2817 bitmap_destroy(mddev);
2818 return err;
2819 }
2820 if (mddev->pers->sync_request)
2821 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2822 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2823 mddev->ro = 0;
2824
2825 atomic_set(&mddev->writes_pending,0);
2826 mddev->safemode = 0;
2827 mddev->safemode_timer.function = md_safemode_timeout;
2828 mddev->safemode_timer.data = (unsigned long) mddev;
2829 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
2830 mddev->in_sync = 1;
2831
2832 ITERATE_RDEV(mddev,rdev,tmp)
2833 if (rdev->raid_disk >= 0) {
2834 char nm[20];
2835 sprintf(nm, "rd%d", rdev->raid_disk);
2836 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2837 }
2838
2839 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2840 md_wakeup_thread(mddev->thread);
2841
2842 if (mddev->sb_dirty)
2843 md_update_sb(mddev);
2844
2845 set_capacity(disk, mddev->array_size<<1);
2846
2847 /* If we call blk_queue_make_request here, it will
2848 * re-initialise max_sectors etc which may have been
2849 * refined inside -> run. So just set the bits we need to set.
2850 * Most initialisation happended when we called
2851 * blk_queue_make_request(..., md_fail_request)
2852 * earlier.
2853 */
2854 mddev->queue->queuedata = mddev;
2855 mddev->queue->make_request_fn = mddev->pers->make_request;
2856
2857 /* If there is a partially-recovered drive we need to
2858 * start recovery here. If we leave it to md_check_recovery,
2859 * it will remove the drives and not do the right thing
2860 */
2861 if (mddev->degraded) {
2862 struct list_head *rtmp;
2863 int spares = 0;
2864 ITERATE_RDEV(mddev,rdev,rtmp)
2865 if (rdev->raid_disk >= 0 &&
2866 !test_bit(In_sync, &rdev->flags) &&
2867 !test_bit(Faulty, &rdev->flags))
2868 /* complete an interrupted recovery */
2869 spares++;
2870 if (spares && mddev->pers->sync_request) {
2871 mddev->recovery = 0;
2872 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
2873 mddev->sync_thread = md_register_thread(md_do_sync,
2874 mddev,
2875 "%s_resync");
2876 if (!mddev->sync_thread) {
2877 printk(KERN_ERR "%s: could not start resync"
2878 " thread...\n",
2879 mdname(mddev));
2880 /* leave the spares where they are, it shouldn't hurt */
2881 mddev->recovery = 0;
2882 } else
2883 md_wakeup_thread(mddev->sync_thread);
2884 }
2885 }
2886
2887 mddev->changed = 1;
2888 md_new_event(mddev);
2889 return 0;
2890 }
2891
2892 static int restart_array(mddev_t *mddev)
2893 {
2894 struct gendisk *disk = mddev->gendisk;
2895 int err;
2896
2897 /*
2898 * Complain if it has no devices
2899 */
2900 err = -ENXIO;
2901 if (list_empty(&mddev->disks))
2902 goto out;
2903
2904 if (mddev->pers) {
2905 err = -EBUSY;
2906 if (!mddev->ro)
2907 goto out;
2908
2909 mddev->safemode = 0;
2910 mddev->ro = 0;
2911 set_disk_ro(disk, 0);
2912
2913 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2914 mdname(mddev));
2915 /*
2916 * Kick recovery or resync if necessary
2917 */
2918 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2919 md_wakeup_thread(mddev->thread);
2920 md_wakeup_thread(mddev->sync_thread);
2921 err = 0;
2922 } else {
2923 printk(KERN_ERR "md: %s has no personality assigned.\n",
2924 mdname(mddev));
2925 err = -EINVAL;
2926 }
2927
2928 out:
2929 return err;
2930 }
2931
2932 /* similar to deny_write_access, but accounts for our holding a reference
2933 * to the file ourselves */
2934 static int deny_bitmap_write_access(struct file * file)
2935 {
2936 struct inode *inode = file->f_mapping->host;
2937
2938 spin_lock(&inode->i_lock);
2939 if (atomic_read(&inode->i_writecount) > 1) {
2940 spin_unlock(&inode->i_lock);
2941 return -ETXTBSY;
2942 }
2943 atomic_set(&inode->i_writecount, -1);
2944 spin_unlock(&inode->i_lock);
2945
2946 return 0;
2947 }
2948
2949 static void restore_bitmap_write_access(struct file *file)
2950 {
2951 struct inode *inode = file->f_mapping->host;
2952
2953 spin_lock(&inode->i_lock);
2954 atomic_set(&inode->i_writecount, 1);
2955 spin_unlock(&inode->i_lock);
2956 }
2957
2958 static int do_md_stop(mddev_t * mddev, int ro)
2959 {
2960 int err = 0;
2961 struct gendisk *disk = mddev->gendisk;
2962
2963 if (mddev->pers) {
2964 if (atomic_read(&mddev->active)>2) {
2965 printk("md: %s still in use.\n",mdname(mddev));
2966 return -EBUSY;
2967 }
2968
2969 if (mddev->sync_thread) {
2970 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
2971 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2972 md_unregister_thread(mddev->sync_thread);
2973 mddev->sync_thread = NULL;
2974 }
2975
2976 del_timer_sync(&mddev->safemode_timer);
2977
2978 invalidate_partition(disk, 0);
2979
2980 if (ro) {
2981 err = -ENXIO;
2982 if (mddev->ro==1)
2983 goto out;
2984 mddev->ro = 1;
2985 } else {
2986 bitmap_flush(mddev);
2987 md_super_wait(mddev);
2988 if (mddev->ro)
2989 set_disk_ro(disk, 0);
2990 blk_queue_make_request(mddev->queue, md_fail_request);
2991 mddev->pers->stop(mddev);
2992 if (mddev->pers->sync_request)
2993 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2994
2995 module_put(mddev->pers->owner);
2996 mddev->pers = NULL;
2997 if (mddev->ro)
2998 mddev->ro = 0;
2999 }
3000 if (!mddev->in_sync || mddev->sb_dirty) {
3001 /* mark array as shutdown cleanly */
3002 mddev->in_sync = 1;
3003 md_update_sb(mddev);
3004 }
3005 if (ro)
3006 set_disk_ro(disk, 1);
3007 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3008 }
3009
3010 /*
3011 * Free resources if final stop
3012 */
3013 if (!ro) {
3014 mdk_rdev_t *rdev;
3015 struct list_head *tmp;
3016 struct gendisk *disk;
3017 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3018
3019 bitmap_destroy(mddev);
3020 if (mddev->bitmap_file) {
3021 restore_bitmap_write_access(mddev->bitmap_file);
3022 fput(mddev->bitmap_file);
3023 mddev->bitmap_file = NULL;
3024 }
3025 mddev->bitmap_offset = 0;
3026
3027 ITERATE_RDEV(mddev,rdev,tmp)
3028 if (rdev->raid_disk >= 0) {
3029 char nm[20];
3030 sprintf(nm, "rd%d", rdev->raid_disk);
3031 sysfs_remove_link(&mddev->kobj, nm);
3032 }
3033
3034 export_array(mddev);
3035
3036 mddev->array_size = 0;
3037 disk = mddev->gendisk;
3038 if (disk)
3039 set_capacity(disk, 0);
3040 mddev->changed = 1;
3041 } else if (mddev->pers)
3042 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3043 mdname(mddev));
3044 err = 0;
3045 md_new_event(mddev);
3046 out:
3047 return err;
3048 }
3049
3050 static void autorun_array(mddev_t *mddev)
3051 {
3052 mdk_rdev_t *rdev;
3053 struct list_head *tmp;
3054 int err;
3055
3056 if (list_empty(&mddev->disks))
3057 return;
3058
3059 printk(KERN_INFO "md: running: ");
3060
3061 ITERATE_RDEV(mddev,rdev,tmp) {
3062 char b[BDEVNAME_SIZE];
3063 printk("<%s>", bdevname(rdev->bdev,b));
3064 }
3065 printk("\n");
3066
3067 err = do_md_run (mddev);
3068 if (err) {
3069 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3070 do_md_stop (mddev, 0);
3071 }
3072 }
3073
3074 /*
3075 * lets try to run arrays based on all disks that have arrived
3076 * until now. (those are in pending_raid_disks)
3077 *
3078 * the method: pick the first pending disk, collect all disks with
3079 * the same UUID, remove all from the pending list and put them into
3080 * the 'same_array' list. Then order this list based on superblock
3081 * update time (freshest comes first), kick out 'old' disks and
3082 * compare superblocks. If everything's fine then run it.
3083 *
3084 * If "unit" is allocated, then bump its reference count
3085 */
3086 static void autorun_devices(int part)
3087 {
3088 struct list_head *tmp;
3089 mdk_rdev_t *rdev0, *rdev;
3090 mddev_t *mddev;
3091 char b[BDEVNAME_SIZE];
3092
3093 printk(KERN_INFO "md: autorun ...\n");
3094 while (!list_empty(&pending_raid_disks)) {
3095 dev_t dev;
3096 LIST_HEAD(candidates);
3097 rdev0 = list_entry(pending_raid_disks.next,
3098 mdk_rdev_t, same_set);
3099
3100 printk(KERN_INFO "md: considering %s ...\n",
3101 bdevname(rdev0->bdev,b));
3102 INIT_LIST_HEAD(&candidates);
3103 ITERATE_RDEV_PENDING(rdev,tmp)
3104 if (super_90_load(rdev, rdev0, 0) >= 0) {
3105 printk(KERN_INFO "md: adding %s ...\n",
3106 bdevname(rdev->bdev,b));
3107 list_move(&rdev->same_set, &candidates);
3108 }
3109 /*
3110 * now we have a set of devices, with all of them having
3111 * mostly sane superblocks. It's time to allocate the
3112 * mddev.
3113 */
3114 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
3115 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3116 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3117 break;
3118 }
3119 if (part)
3120 dev = MKDEV(mdp_major,
3121 rdev0->preferred_minor << MdpMinorShift);
3122 else
3123 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3124
3125 md_probe(dev, NULL, NULL);
3126 mddev = mddev_find(dev);
3127 if (!mddev) {
3128 printk(KERN_ERR
3129 "md: cannot allocate memory for md drive.\n");
3130 break;
3131 }
3132 if (mddev_lock(mddev))
3133 printk(KERN_WARNING "md: %s locked, cannot run\n",
3134 mdname(mddev));
3135 else if (mddev->raid_disks || mddev->major_version
3136 || !list_empty(&mddev->disks)) {
3137 printk(KERN_WARNING
3138 "md: %s already running, cannot run %s\n",
3139 mdname(mddev), bdevname(rdev0->bdev,b));
3140 mddev_unlock(mddev);
3141 } else {
3142 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3143 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3144 list_del_init(&rdev->same_set);
3145 if (bind_rdev_to_array(rdev, mddev))
3146 export_rdev(rdev);
3147 }
3148 autorun_array(mddev);
3149 mddev_unlock(mddev);
3150 }
3151 /* on success, candidates will be empty, on error
3152 * it won't...
3153 */
3154 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3155 export_rdev(rdev);
3156 mddev_put(mddev);
3157 }
3158 printk(KERN_INFO "md: ... autorun DONE.\n");
3159 }
3160
3161 /*
3162 * import RAID devices based on one partition
3163 * if possible, the array gets run as well.
3164 */
3165
3166 static int autostart_array(dev_t startdev)
3167 {
3168 char b[BDEVNAME_SIZE];
3169 int err = -EINVAL, i;
3170 mdp_super_t *sb = NULL;
3171 mdk_rdev_t *start_rdev = NULL, *rdev;
3172
3173 start_rdev = md_import_device(startdev, 0, 0);
3174 if (IS_ERR(start_rdev))
3175 return err;
3176
3177
3178 /* NOTE: this can only work for 0.90.0 superblocks */
3179 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
3180 if (sb->major_version != 0 ||
3181 sb->minor_version != 90 ) {
3182 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
3183 export_rdev(start_rdev);
3184 return err;
3185 }
3186
3187 if (test_bit(Faulty, &start_rdev->flags)) {
3188 printk(KERN_WARNING
3189 "md: can not autostart based on faulty %s!\n",
3190 bdevname(start_rdev->bdev,b));
3191 export_rdev(start_rdev);
3192 return err;
3193 }
3194 list_add(&start_rdev->same_set, &pending_raid_disks);
3195
3196 for (i = 0; i < MD_SB_DISKS; i++) {
3197 mdp_disk_t *desc = sb->disks + i;
3198 dev_t dev = MKDEV(desc->major, desc->minor);
3199
3200 if (!dev)
3201 continue;
3202 if (dev == startdev)
3203 continue;
3204 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
3205 continue;
3206 rdev = md_import_device(dev, 0, 0);
3207 if (IS_ERR(rdev))
3208 continue;
3209
3210 list_add(&rdev->same_set, &pending_raid_disks);
3211 }
3212
3213 /*
3214 * possibly return codes
3215 */
3216 autorun_devices(0);
3217 return 0;
3218
3219 }
3220
3221
3222 static int get_version(void __user * arg)
3223 {
3224 mdu_version_t ver;
3225
3226 ver.major = MD_MAJOR_VERSION;
3227 ver.minor = MD_MINOR_VERSION;
3228 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3229
3230 if (copy_to_user(arg, &ver, sizeof(ver)))
3231 return -EFAULT;
3232
3233 return 0;
3234 }
3235
3236 static int get_array_info(mddev_t * mddev, void __user * arg)
3237 {
3238 mdu_array_info_t info;
3239 int nr,working,active,failed,spare;
3240 mdk_rdev_t *rdev;
3241 struct list_head *tmp;
3242
3243 nr=working=active=failed=spare=0;
3244 ITERATE_RDEV(mddev,rdev,tmp) {
3245 nr++;
3246 if (test_bit(Faulty, &rdev->flags))
3247 failed++;
3248 else {
3249 working++;
3250 if (test_bit(In_sync, &rdev->flags))
3251 active++;
3252 else
3253 spare++;
3254 }
3255 }
3256
3257 info.major_version = mddev->major_version;
3258 info.minor_version = mddev->minor_version;
3259 info.patch_version = MD_PATCHLEVEL_VERSION;
3260 info.ctime = mddev->ctime;
3261 info.level = mddev->level;
3262 info.size = mddev->size;
3263 if (info.size != mddev->size) /* overflow */
3264 info.size = -1;
3265 info.nr_disks = nr;
3266 info.raid_disks = mddev->raid_disks;
3267 info.md_minor = mddev->md_minor;
3268 info.not_persistent= !mddev->persistent;
3269
3270 info.utime = mddev->utime;
3271 info.state = 0;
3272 if (mddev->in_sync)
3273 info.state = (1<<MD_SB_CLEAN);
3274 if (mddev->bitmap && mddev->bitmap_offset)
3275 info.state = (1<<MD_SB_BITMAP_PRESENT);
3276 info.active_disks = active;
3277 info.working_disks = working;
3278 info.failed_disks = failed;
3279 info.spare_disks = spare;
3280
3281 info.layout = mddev->layout;
3282 info.chunk_size = mddev->chunk_size;
3283
3284 if (copy_to_user(arg, &info, sizeof(info)))
3285 return -EFAULT;
3286
3287 return 0;
3288 }
3289
3290 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
3291 {
3292 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3293 char *ptr, *buf = NULL;
3294 int err = -ENOMEM;
3295
3296 file = kmalloc(sizeof(*file), GFP_KERNEL);
3297 if (!file)
3298 goto out;
3299
3300 /* bitmap disabled, zero the first byte and copy out */
3301 if (!mddev->bitmap || !mddev->bitmap->file) {
3302 file->pathname[0] = '\0';
3303 goto copy_out;
3304 }
3305
3306 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3307 if (!buf)
3308 goto out;
3309
3310 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3311 if (!ptr)
3312 goto out;
3313
3314 strcpy(file->pathname, ptr);
3315
3316 copy_out:
3317 err = 0;
3318 if (copy_to_user(arg, file, sizeof(*file)))
3319 err = -EFAULT;
3320 out:
3321 kfree(buf);
3322 kfree(file);
3323 return err;
3324 }
3325
3326 static int get_disk_info(mddev_t * mddev, void __user * arg)
3327 {
3328 mdu_disk_info_t info;
3329 unsigned int nr;
3330 mdk_rdev_t *rdev;
3331
3332 if (copy_from_user(&info, arg, sizeof(info)))
3333 return -EFAULT;
3334
3335 nr = info.number;
3336
3337 rdev = find_rdev_nr(mddev, nr);
3338 if (rdev) {
3339 info.major = MAJOR(rdev->bdev->bd_dev);
3340 info.minor = MINOR(rdev->bdev->bd_dev);
3341 info.raid_disk = rdev->raid_disk;
3342 info.state = 0;
3343 if (test_bit(Faulty, &rdev->flags))
3344 info.state |= (1<<MD_DISK_FAULTY);
3345 else if (test_bit(In_sync, &rdev->flags)) {
3346 info.state |= (1<<MD_DISK_ACTIVE);
3347 info.state |= (1<<MD_DISK_SYNC);
3348 }
3349 if (test_bit(WriteMostly, &rdev->flags))
3350 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3351 } else {
3352 info.major = info.minor = 0;
3353 info.raid_disk = -1;
3354 info.state = (1<<MD_DISK_REMOVED);
3355 }
3356
3357 if (copy_to_user(arg, &info, sizeof(info)))
3358 return -EFAULT;
3359
3360 return 0;
3361 }
3362
3363 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3364 {
3365 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3366 mdk_rdev_t *rdev;
3367 dev_t dev = MKDEV(info->major,info->minor);
3368
3369 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3370 return -EOVERFLOW;
3371
3372 if (!mddev->raid_disks) {
3373 int err;
3374 /* expecting a device which has a superblock */
3375 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3376 if (IS_ERR(rdev)) {
3377 printk(KERN_WARNING
3378 "md: md_import_device returned %ld\n",
3379 PTR_ERR(rdev));
3380 return PTR_ERR(rdev);
3381 }
3382 if (!list_empty(&mddev->disks)) {
3383 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3384 mdk_rdev_t, same_set);
3385 int err = super_types[mddev->major_version]
3386 .load_super(rdev, rdev0, mddev->minor_version);
3387 if (err < 0) {
3388 printk(KERN_WARNING
3389 "md: %s has different UUID to %s\n",
3390 bdevname(rdev->bdev,b),
3391 bdevname(rdev0->bdev,b2));
3392 export_rdev(rdev);
3393 return -EINVAL;
3394 }
3395 }
3396 err = bind_rdev_to_array(rdev, mddev);
3397 if (err)
3398 export_rdev(rdev);
3399 return err;
3400 }
3401
3402 /*
3403 * add_new_disk can be used once the array is assembled
3404 * to add "hot spares". They must already have a superblock
3405 * written
3406 */
3407 if (mddev->pers) {
3408 int err;
3409 if (!mddev->pers->hot_add_disk) {
3410 printk(KERN_WARNING
3411 "%s: personality does not support diskops!\n",
3412 mdname(mddev));
3413 return -EINVAL;
3414 }
3415 if (mddev->persistent)
3416 rdev = md_import_device(dev, mddev->major_version,
3417 mddev->minor_version);
3418 else
3419 rdev = md_import_device(dev, -1, -1);
3420 if (IS_ERR(rdev)) {
3421 printk(KERN_WARNING
3422 "md: md_import_device returned %ld\n",
3423 PTR_ERR(rdev));
3424 return PTR_ERR(rdev);
3425 }
3426 /* set save_raid_disk if appropriate */
3427 if (!mddev->persistent) {
3428 if (info->state & (1<<MD_DISK_SYNC) &&
3429 info->raid_disk < mddev->raid_disks)
3430 rdev->raid_disk = info->raid_disk;
3431 else
3432 rdev->raid_disk = -1;
3433 } else
3434 super_types[mddev->major_version].
3435 validate_super(mddev, rdev);
3436 rdev->saved_raid_disk = rdev->raid_disk;
3437
3438 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3439 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3440 set_bit(WriteMostly, &rdev->flags);
3441
3442 rdev->raid_disk = -1;
3443 err = bind_rdev_to_array(rdev, mddev);
3444 if (!err && !mddev->pers->hot_remove_disk) {
3445 /* If there is hot_add_disk but no hot_remove_disk
3446 * then added disks for geometry changes,
3447 * and should be added immediately.
3448 */
3449 super_types[mddev->major_version].
3450 validate_super(mddev, rdev);
3451 err = mddev->pers->hot_add_disk(mddev, rdev);
3452 if (err)
3453 unbind_rdev_from_array(rdev);
3454 }
3455 if (err)
3456 export_rdev(rdev);
3457
3458 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3459 md_wakeup_thread(mddev->thread);
3460 return err;
3461 }
3462
3463 /* otherwise, add_new_disk is only allowed
3464 * for major_version==0 superblocks
3465 */
3466 if (mddev->major_version != 0) {
3467 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3468 mdname(mddev));
3469 return -EINVAL;
3470 }
3471
3472 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3473 int err;
3474 rdev = md_import_device (dev, -1, 0);
3475 if (IS_ERR(rdev)) {
3476 printk(KERN_WARNING
3477 "md: error, md_import_device() returned %ld\n",
3478 PTR_ERR(rdev));
3479 return PTR_ERR(rdev);
3480 }
3481 rdev->desc_nr = info->number;
3482 if (info->raid_disk < mddev->raid_disks)
3483 rdev->raid_disk = info->raid_disk;
3484 else
3485 rdev->raid_disk = -1;
3486
3487 rdev->flags = 0;
3488
3489 if (rdev->raid_disk < mddev->raid_disks)
3490 if (info->state & (1<<MD_DISK_SYNC))
3491 set_bit(In_sync, &rdev->flags);
3492
3493 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3494 set_bit(WriteMostly, &rdev->flags);
3495
3496 if (!mddev->persistent) {
3497 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3498 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3499 } else
3500 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3501 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3502
3503 err = bind_rdev_to_array(rdev, mddev);
3504 if (err) {
3505 export_rdev(rdev);
3506 return err;
3507 }
3508 }
3509
3510 return 0;
3511 }
3512
3513 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3514 {
3515 char b[BDEVNAME_SIZE];
3516 mdk_rdev_t *rdev;
3517
3518 if (!mddev->pers)
3519 return -ENODEV;
3520
3521 rdev = find_rdev(mddev, dev);
3522 if (!rdev)
3523 return -ENXIO;
3524
3525 if (rdev->raid_disk >= 0)
3526 goto busy;
3527
3528 kick_rdev_from_array(rdev);
3529 md_update_sb(mddev);
3530 md_new_event(mddev);
3531
3532 return 0;
3533 busy:
3534 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3535 bdevname(rdev->bdev,b), mdname(mddev));
3536 return -EBUSY;
3537 }
3538
3539 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3540 {
3541 char b[BDEVNAME_SIZE];
3542 int err;
3543 unsigned int size;
3544 mdk_rdev_t *rdev;
3545
3546 if (!mddev->pers)
3547 return -ENODEV;
3548
3549 if (mddev->major_version != 0) {
3550 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3551 " version-0 superblocks.\n",
3552 mdname(mddev));
3553 return -EINVAL;
3554 }
3555 if (!mddev->pers->hot_add_disk) {
3556 printk(KERN_WARNING
3557 "%s: personality does not support diskops!\n",
3558 mdname(mddev));
3559 return -EINVAL;
3560 }
3561
3562 rdev = md_import_device (dev, -1, 0);
3563 if (IS_ERR(rdev)) {
3564 printk(KERN_WARNING
3565 "md: error, md_import_device() returned %ld\n",
3566 PTR_ERR(rdev));
3567 return -EINVAL;
3568 }
3569
3570 if (mddev->persistent)
3571 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3572 else
3573 rdev->sb_offset =
3574 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3575
3576 size = calc_dev_size(rdev, mddev->chunk_size);
3577 rdev->size = size;
3578
3579 if (test_bit(Faulty, &rdev->flags)) {
3580 printk(KERN_WARNING
3581 "md: can not hot-add faulty %s disk to %s!\n",
3582 bdevname(rdev->bdev,b), mdname(mddev));
3583 err = -EINVAL;
3584 goto abort_export;
3585 }
3586 clear_bit(In_sync, &rdev->flags);
3587 rdev->desc_nr = -1;
3588 err = bind_rdev_to_array(rdev, mddev);
3589 if (err)
3590 goto abort_export;
3591
3592 /*
3593 * The rest should better be atomic, we can have disk failures
3594 * noticed in interrupt contexts ...
3595 */
3596
3597 if (rdev->desc_nr == mddev->max_disks) {
3598 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3599 mdname(mddev));
3600 err = -EBUSY;
3601 goto abort_unbind_export;
3602 }
3603
3604 rdev->raid_disk = -1;
3605
3606 md_update_sb(mddev);
3607
3608 /*
3609 * Kick recovery, maybe this spare has to be added to the
3610 * array immediately.
3611 */
3612 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3613 md_wakeup_thread(mddev->thread);
3614 md_new_event(mddev);
3615 return 0;
3616
3617 abort_unbind_export:
3618 unbind_rdev_from_array(rdev);
3619
3620 abort_export:
3621 export_rdev(rdev);
3622 return err;
3623 }
3624
3625 static int set_bitmap_file(mddev_t *mddev, int fd)
3626 {
3627 int err;
3628
3629 if (mddev->pers) {
3630 if (!mddev->pers->quiesce)
3631 return -EBUSY;
3632 if (mddev->recovery || mddev->sync_thread)
3633 return -EBUSY;
3634 /* we should be able to change the bitmap.. */
3635 }
3636
3637
3638 if (fd >= 0) {
3639 if (mddev->bitmap)
3640 return -EEXIST; /* cannot add when bitmap is present */
3641 mddev->bitmap_file = fget(fd);
3642
3643 if (mddev->bitmap_file == NULL) {
3644 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3645 mdname(mddev));
3646 return -EBADF;
3647 }
3648
3649 err = deny_bitmap_write_access(mddev->bitmap_file);
3650 if (err) {
3651 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3652 mdname(mddev));
3653 fput(mddev->bitmap_file);
3654 mddev->bitmap_file = NULL;
3655 return err;
3656 }
3657 mddev->bitmap_offset = 0; /* file overrides offset */
3658 } else if (mddev->bitmap == NULL)
3659 return -ENOENT; /* cannot remove what isn't there */
3660 err = 0;
3661 if (mddev->pers) {
3662 mddev->pers->quiesce(mddev, 1);
3663 if (fd >= 0)
3664 err = bitmap_create(mddev);
3665 if (fd < 0 || err) {
3666 bitmap_destroy(mddev);
3667 fd = -1; /* make sure to put the file */
3668 }
3669 mddev->pers->quiesce(mddev, 0);
3670 }
3671 if (fd < 0) {
3672 if (mddev->bitmap_file) {
3673 restore_bitmap_write_access(mddev->bitmap_file);
3674 fput(mddev->bitmap_file);
3675 }
3676 mddev->bitmap_file = NULL;
3677 }
3678
3679 return err;
3680 }
3681
3682 /*
3683 * set_array_info is used two different ways
3684 * The original usage is when creating a new array.
3685 * In this usage, raid_disks is > 0 and it together with
3686 * level, size, not_persistent,layout,chunksize determine the
3687 * shape of the array.
3688 * This will always create an array with a type-0.90.0 superblock.
3689 * The newer usage is when assembling an array.
3690 * In this case raid_disks will be 0, and the major_version field is
3691 * use to determine which style super-blocks are to be found on the devices.
3692 * The minor and patch _version numbers are also kept incase the
3693 * super_block handler wishes to interpret them.
3694 */
3695 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3696 {
3697
3698 if (info->raid_disks == 0) {
3699 /* just setting version number for superblock loading */
3700 if (info->major_version < 0 ||
3701 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3702 super_types[info->major_version].name == NULL) {
3703 /* maybe try to auto-load a module? */
3704 printk(KERN_INFO
3705 "md: superblock version %d not known\n",
3706 info->major_version);
3707 return -EINVAL;
3708 }
3709 mddev->major_version = info->major_version;
3710 mddev->minor_version = info->minor_version;
3711 mddev->patch_version = info->patch_version;
3712 return 0;
3713 }
3714 mddev->major_version = MD_MAJOR_VERSION;
3715 mddev->minor_version = MD_MINOR_VERSION;
3716 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3717 mddev->ctime = get_seconds();
3718
3719 mddev->level = info->level;
3720 mddev->clevel[0] = 0;
3721 mddev->size = info->size;
3722 mddev->raid_disks = info->raid_disks;
3723 /* don't set md_minor, it is determined by which /dev/md* was
3724 * openned
3725 */
3726 if (info->state & (1<<MD_SB_CLEAN))
3727 mddev->recovery_cp = MaxSector;
3728 else
3729 mddev->recovery_cp = 0;
3730 mddev->persistent = ! info->not_persistent;
3731
3732 mddev->layout = info->layout;
3733 mddev->chunk_size = info->chunk_size;
3734
3735 mddev->max_disks = MD_SB_DISKS;
3736
3737 mddev->sb_dirty = 1;
3738
3739 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3740 mddev->bitmap_offset = 0;
3741
3742 mddev->reshape_position = MaxSector;
3743
3744 /*
3745 * Generate a 128 bit UUID
3746 */
3747 get_random_bytes(mddev->uuid, 16);
3748
3749 mddev->new_level = mddev->level;
3750 mddev->new_chunk = mddev->chunk_size;
3751 mddev->new_layout = mddev->layout;
3752 mddev->delta_disks = 0;
3753
3754 return 0;
3755 }
3756
3757 static int update_size(mddev_t *mddev, unsigned long size)
3758 {
3759 mdk_rdev_t * rdev;
3760 int rv;
3761 struct list_head *tmp;
3762 int fit = (size == 0);
3763
3764 if (mddev->pers->resize == NULL)
3765 return -EINVAL;
3766 /* The "size" is the amount of each device that is used.
3767 * This can only make sense for arrays with redundancy.
3768 * linear and raid0 always use whatever space is available
3769 * We can only consider changing the size if no resync
3770 * or reconstruction is happening, and if the new size
3771 * is acceptable. It must fit before the sb_offset or,
3772 * if that is <data_offset, it must fit before the
3773 * size of each device.
3774 * If size is zero, we find the largest size that fits.
3775 */
3776 if (mddev->sync_thread)
3777 return -EBUSY;
3778 ITERATE_RDEV(mddev,rdev,tmp) {
3779 sector_t avail;
3780 if (rdev->sb_offset > rdev->data_offset)
3781 avail = (rdev->sb_offset*2) - rdev->data_offset;
3782 else
3783 avail = get_capacity(rdev->bdev->bd_disk)
3784 - rdev->data_offset;
3785 if (fit && (size == 0 || size > avail/2))
3786 size = avail/2;
3787 if (avail < ((sector_t)size << 1))
3788 return -ENOSPC;
3789 }
3790 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3791 if (!rv) {
3792 struct block_device *bdev;
3793
3794 bdev = bdget_disk(mddev->gendisk, 0);
3795 if (bdev) {
3796 mutex_lock(&bdev->bd_inode->i_mutex);
3797 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
3798 mutex_unlock(&bdev->bd_inode->i_mutex);
3799 bdput(bdev);
3800 }
3801 }
3802 return rv;
3803 }
3804
3805 static int update_raid_disks(mddev_t *mddev, int raid_disks)
3806 {
3807 int rv;
3808 /* change the number of raid disks */
3809 if (mddev->pers->check_reshape == NULL)
3810 return -EINVAL;
3811 if (raid_disks <= 0 ||
3812 raid_disks >= mddev->max_disks)
3813 return -EINVAL;
3814 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
3815 return -EBUSY;
3816 mddev->delta_disks = raid_disks - mddev->raid_disks;
3817
3818 rv = mddev->pers->check_reshape(mddev);
3819 return rv;
3820 }
3821
3822
3823 /*
3824 * update_array_info is used to change the configuration of an
3825 * on-line array.
3826 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3827 * fields in the info are checked against the array.
3828 * Any differences that cannot be handled will cause an error.
3829 * Normally, only one change can be managed at a time.
3830 */
3831 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3832 {
3833 int rv = 0;
3834 int cnt = 0;
3835 int state = 0;
3836
3837 /* calculate expected state,ignoring low bits */
3838 if (mddev->bitmap && mddev->bitmap_offset)
3839 state |= (1 << MD_SB_BITMAP_PRESENT);
3840
3841 if (mddev->major_version != info->major_version ||
3842 mddev->minor_version != info->minor_version ||
3843 /* mddev->patch_version != info->patch_version || */
3844 mddev->ctime != info->ctime ||
3845 mddev->level != info->level ||
3846 /* mddev->layout != info->layout || */
3847 !mddev->persistent != info->not_persistent||
3848 mddev->chunk_size != info->chunk_size ||
3849 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3850 ((state^info->state) & 0xfffffe00)
3851 )
3852 return -EINVAL;
3853 /* Check there is only one change */
3854 if (info->size >= 0 && mddev->size != info->size) cnt++;
3855 if (mddev->raid_disks != info->raid_disks) cnt++;
3856 if (mddev->layout != info->layout) cnt++;
3857 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
3858 if (cnt == 0) return 0;
3859 if (cnt > 1) return -EINVAL;
3860
3861 if (mddev->layout != info->layout) {
3862 /* Change layout
3863 * we don't need to do anything at the md level, the
3864 * personality will take care of it all.
3865 */
3866 if (mddev->pers->reconfig == NULL)
3867 return -EINVAL;
3868 else
3869 return mddev->pers->reconfig(mddev, info->layout, -1);
3870 }
3871 if (info->size >= 0 && mddev->size != info->size)
3872 rv = update_size(mddev, info->size);
3873
3874 if (mddev->raid_disks != info->raid_disks)
3875 rv = update_raid_disks(mddev, info->raid_disks);
3876
3877 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3878 if (mddev->pers->quiesce == NULL)
3879 return -EINVAL;
3880 if (mddev->recovery || mddev->sync_thread)
3881 return -EBUSY;
3882 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3883 /* add the bitmap */
3884 if (mddev->bitmap)
3885 return -EEXIST;
3886 if (mddev->default_bitmap_offset == 0)
3887 return -EINVAL;
3888 mddev->bitmap_offset = mddev->default_bitmap_offset;
3889 mddev->pers->quiesce(mddev, 1);
3890 rv = bitmap_create(mddev);
3891 if (rv)
3892 bitmap_destroy(mddev);
3893 mddev->pers->quiesce(mddev, 0);
3894 } else {
3895 /* remove the bitmap */
3896 if (!mddev->bitmap)
3897 return -ENOENT;
3898 if (mddev->bitmap->file)
3899 return -EINVAL;
3900 mddev->pers->quiesce(mddev, 1);
3901 bitmap_destroy(mddev);
3902 mddev->pers->quiesce(mddev, 0);
3903 mddev->bitmap_offset = 0;
3904 }
3905 }
3906 md_update_sb(mddev);
3907 return rv;
3908 }
3909
3910 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3911 {
3912 mdk_rdev_t *rdev;
3913
3914 if (mddev->pers == NULL)
3915 return -ENODEV;
3916
3917 rdev = find_rdev(mddev, dev);
3918 if (!rdev)
3919 return -ENODEV;
3920
3921 md_error(mddev, rdev);
3922 return 0;
3923 }
3924
3925 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3926 {
3927 mddev_t *mddev = bdev->bd_disk->private_data;
3928
3929 geo->heads = 2;
3930 geo->sectors = 4;
3931 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3932 return 0;
3933 }
3934
3935 static int md_ioctl(struct inode *inode, struct file *file,
3936 unsigned int cmd, unsigned long arg)
3937 {
3938 int err = 0;
3939 void __user *argp = (void __user *)arg;
3940 mddev_t *mddev = NULL;
3941
3942 if (!capable(CAP_SYS_ADMIN))
3943 return -EACCES;
3944
3945 /*
3946 * Commands dealing with the RAID driver but not any
3947 * particular array:
3948 */
3949 switch (cmd)
3950 {
3951 case RAID_VERSION:
3952 err = get_version(argp);
3953 goto done;
3954
3955 case PRINT_RAID_DEBUG:
3956 err = 0;
3957 md_print_devices();
3958 goto done;
3959
3960 #ifndef MODULE
3961 case RAID_AUTORUN:
3962 err = 0;
3963 autostart_arrays(arg);
3964 goto done;
3965 #endif
3966 default:;
3967 }
3968
3969 /*
3970 * Commands creating/starting a new array:
3971 */
3972
3973 mddev = inode->i_bdev->bd_disk->private_data;
3974
3975 if (!mddev) {
3976 BUG();
3977 goto abort;
3978 }
3979
3980
3981 if (cmd == START_ARRAY) {
3982 /* START_ARRAY doesn't need to lock the array as autostart_array
3983 * does the locking, and it could even be a different array
3984 */
3985 static int cnt = 3;
3986 if (cnt > 0 ) {
3987 printk(KERN_WARNING
3988 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3989 "This will not be supported beyond July 2006\n",
3990 current->comm, current->pid);
3991 cnt--;
3992 }
3993 err = autostart_array(new_decode_dev(arg));
3994 if (err) {
3995 printk(KERN_WARNING "md: autostart failed!\n");
3996 goto abort;
3997 }
3998 goto done;
3999 }
4000
4001 err = mddev_lock(mddev);
4002 if (err) {
4003 printk(KERN_INFO
4004 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4005 err, cmd);
4006 goto abort;
4007 }
4008
4009 switch (cmd)
4010 {
4011 case SET_ARRAY_INFO:
4012 {
4013 mdu_array_info_t info;
4014 if (!arg)
4015 memset(&info, 0, sizeof(info));
4016 else if (copy_from_user(&info, argp, sizeof(info))) {
4017 err = -EFAULT;
4018 goto abort_unlock;
4019 }
4020 if (mddev->pers) {
4021 err = update_array_info(mddev, &info);
4022 if (err) {
4023 printk(KERN_WARNING "md: couldn't update"
4024 " array info. %d\n", err);
4025 goto abort_unlock;
4026 }
4027 goto done_unlock;
4028 }
4029 if (!list_empty(&mddev->disks)) {
4030 printk(KERN_WARNING
4031 "md: array %s already has disks!\n",
4032 mdname(mddev));
4033 err = -EBUSY;
4034 goto abort_unlock;
4035 }
4036 if (mddev->raid_disks) {
4037 printk(KERN_WARNING
4038 "md: array %s already initialised!\n",
4039 mdname(mddev));
4040 err = -EBUSY;
4041 goto abort_unlock;
4042 }
4043 err = set_array_info(mddev, &info);
4044 if (err) {
4045 printk(KERN_WARNING "md: couldn't set"
4046 " array info. %d\n", err);
4047 goto abort_unlock;
4048 }
4049 }
4050 goto done_unlock;
4051
4052 default:;
4053 }
4054
4055 /*
4056 * Commands querying/configuring an existing array:
4057 */
4058 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4059 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4060 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4061 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
4062 err = -ENODEV;
4063 goto abort_unlock;
4064 }
4065
4066 /*
4067 * Commands even a read-only array can execute:
4068 */
4069 switch (cmd)
4070 {
4071 case GET_ARRAY_INFO:
4072 err = get_array_info(mddev, argp);
4073 goto done_unlock;
4074
4075 case GET_BITMAP_FILE:
4076 err = get_bitmap_file(mddev, argp);
4077 goto done_unlock;
4078
4079 case GET_DISK_INFO:
4080 err = get_disk_info(mddev, argp);
4081 goto done_unlock;
4082
4083 case RESTART_ARRAY_RW:
4084 err = restart_array(mddev);
4085 goto done_unlock;
4086
4087 case STOP_ARRAY:
4088 err = do_md_stop (mddev, 0);
4089 goto done_unlock;
4090
4091 case STOP_ARRAY_RO:
4092 err = do_md_stop (mddev, 1);
4093 goto done_unlock;
4094
4095 /*
4096 * We have a problem here : there is no easy way to give a CHS
4097 * virtual geometry. We currently pretend that we have a 2 heads
4098 * 4 sectors (with a BIG number of cylinders...). This drives
4099 * dosfs just mad... ;-)
4100 */
4101 }
4102
4103 /*
4104 * The remaining ioctls are changing the state of the
4105 * superblock, so we do not allow them on read-only arrays.
4106 * However non-MD ioctls (e.g. get-size) will still come through
4107 * here and hit the 'default' below, so only disallow
4108 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4109 */
4110 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4111 mddev->ro && mddev->pers) {
4112 if (mddev->ro == 2) {
4113 mddev->ro = 0;
4114 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4115 md_wakeup_thread(mddev->thread);
4116
4117 } else {
4118 err = -EROFS;
4119 goto abort_unlock;
4120 }
4121 }
4122
4123 switch (cmd)
4124 {
4125 case ADD_NEW_DISK:
4126 {
4127 mdu_disk_info_t info;
4128 if (copy_from_user(&info, argp, sizeof(info)))
4129 err = -EFAULT;
4130 else
4131 err = add_new_disk(mddev, &info);
4132 goto done_unlock;
4133 }
4134
4135 case HOT_REMOVE_DISK:
4136 err = hot_remove_disk(mddev, new_decode_dev(arg));
4137 goto done_unlock;
4138
4139 case HOT_ADD_DISK:
4140 err = hot_add_disk(mddev, new_decode_dev(arg));
4141 goto done_unlock;
4142
4143 case SET_DISK_FAULTY:
4144 err = set_disk_faulty(mddev, new_decode_dev(arg));
4145 goto done_unlock;
4146
4147 case RUN_ARRAY:
4148 err = do_md_run (mddev);
4149 goto done_unlock;
4150
4151 case SET_BITMAP_FILE:
4152 err = set_bitmap_file(mddev, (int)arg);
4153 goto done_unlock;
4154
4155 default:
4156 err = -EINVAL;
4157 goto abort_unlock;
4158 }
4159
4160 done_unlock:
4161 abort_unlock:
4162 mddev_unlock(mddev);
4163
4164 return err;
4165 done:
4166 if (err)
4167 MD_BUG();
4168 abort:
4169 return err;
4170 }
4171
4172 static int md_open(struct inode *inode, struct file *file)
4173 {
4174 /*
4175 * Succeed if we can lock the mddev, which confirms that
4176 * it isn't being stopped right now.
4177 */
4178 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4179 int err;
4180
4181 if ((err = mddev_lock(mddev)))
4182 goto out;
4183
4184 err = 0;
4185 mddev_get(mddev);
4186 mddev_unlock(mddev);
4187
4188 check_disk_change(inode->i_bdev);
4189 out:
4190 return err;
4191 }
4192
4193 static int md_release(struct inode *inode, struct file * file)
4194 {
4195 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4196
4197 if (!mddev)
4198 BUG();
4199 mddev_put(mddev);
4200
4201 return 0;
4202 }
4203
4204 static int md_media_changed(struct gendisk *disk)
4205 {
4206 mddev_t *mddev = disk->private_data;
4207
4208 return mddev->changed;
4209 }
4210
4211 static int md_revalidate(struct gendisk *disk)
4212 {
4213 mddev_t *mddev = disk->private_data;
4214
4215 mddev->changed = 0;
4216 return 0;
4217 }
4218 static struct block_device_operations md_fops =
4219 {
4220 .owner = THIS_MODULE,
4221 .open = md_open,
4222 .release = md_release,
4223 .ioctl = md_ioctl,
4224 .getgeo = md_getgeo,
4225 .media_changed = md_media_changed,
4226 .revalidate_disk= md_revalidate,
4227 };
4228
4229 static int md_thread(void * arg)
4230 {
4231 mdk_thread_t *thread = arg;
4232
4233 /*
4234 * md_thread is a 'system-thread', it's priority should be very
4235 * high. We avoid resource deadlocks individually in each
4236 * raid personality. (RAID5 does preallocation) We also use RR and
4237 * the very same RT priority as kswapd, thus we will never get
4238 * into a priority inversion deadlock.
4239 *
4240 * we definitely have to have equal or higher priority than
4241 * bdflush, otherwise bdflush will deadlock if there are too
4242 * many dirty RAID5 blocks.
4243 */
4244
4245 allow_signal(SIGKILL);
4246 while (!kthread_should_stop()) {
4247
4248 /* We need to wait INTERRUPTIBLE so that
4249 * we don't add to the load-average.
4250 * That means we need to be sure no signals are
4251 * pending
4252 */
4253 if (signal_pending(current))
4254 flush_signals(current);
4255
4256 wait_event_interruptible_timeout
4257 (thread->wqueue,
4258 test_bit(THREAD_WAKEUP, &thread->flags)
4259 || kthread_should_stop(),
4260 thread->timeout);
4261 try_to_freeze();
4262
4263 clear_bit(THREAD_WAKEUP, &thread->flags);
4264
4265 thread->run(thread->mddev);
4266 }
4267
4268 return 0;
4269 }
4270
4271 void md_wakeup_thread(mdk_thread_t *thread)
4272 {
4273 if (thread) {
4274 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4275 set_bit(THREAD_WAKEUP, &thread->flags);
4276 wake_up(&thread->wqueue);
4277 }
4278 }
4279
4280 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4281 const char *name)
4282 {
4283 mdk_thread_t *thread;
4284
4285 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
4286 if (!thread)
4287 return NULL;
4288
4289 init_waitqueue_head(&thread->wqueue);
4290
4291 thread->run = run;
4292 thread->mddev = mddev;
4293 thread->timeout = MAX_SCHEDULE_TIMEOUT;
4294 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
4295 if (IS_ERR(thread->tsk)) {
4296 kfree(thread);
4297 return NULL;
4298 }
4299 return thread;
4300 }
4301
4302 void md_unregister_thread(mdk_thread_t *thread)
4303 {
4304 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
4305
4306 kthread_stop(thread->tsk);
4307 kfree(thread);
4308 }
4309
4310 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4311 {
4312 if (!mddev) {
4313 MD_BUG();
4314 return;
4315 }
4316
4317 if (!rdev || test_bit(Faulty, &rdev->flags))
4318 return;
4319 /*
4320 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4321 mdname(mddev),
4322 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4323 __builtin_return_address(0),__builtin_return_address(1),
4324 __builtin_return_address(2),__builtin_return_address(3));
4325 */
4326 if (!mddev->pers->error_handler)
4327 return;
4328 mddev->pers->error_handler(mddev,rdev);
4329 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4330 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4331 md_wakeup_thread(mddev->thread);
4332 md_new_event_inintr(mddev);
4333 }
4334
4335 /* seq_file implementation /proc/mdstat */
4336
4337 static void status_unused(struct seq_file *seq)
4338 {
4339 int i = 0;
4340 mdk_rdev_t *rdev;
4341 struct list_head *tmp;
4342
4343 seq_printf(seq, "unused devices: ");
4344
4345 ITERATE_RDEV_PENDING(rdev,tmp) {
4346 char b[BDEVNAME_SIZE];
4347 i++;
4348 seq_printf(seq, "%s ",
4349 bdevname(rdev->bdev,b));
4350 }
4351 if (!i)
4352 seq_printf(seq, "<none>");
4353
4354 seq_printf(seq, "\n");
4355 }
4356
4357
4358 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4359 {
4360 sector_t max_blocks, resync, res;
4361 unsigned long dt, db, rt;
4362 int scale;
4363 unsigned int per_milli;
4364
4365 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4366
4367 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4368 max_blocks = mddev->resync_max_sectors >> 1;
4369 else
4370 max_blocks = mddev->size;
4371
4372 /*
4373 * Should not happen.
4374 */
4375 if (!max_blocks) {
4376 MD_BUG();
4377 return;
4378 }
4379 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4380 * in a sector_t, and (max_blocks>>scale) will fit in a
4381 * u32, as those are the requirements for sector_div.
4382 * Thus 'scale' must be at least 10
4383 */
4384 scale = 10;
4385 if (sizeof(sector_t) > sizeof(unsigned long)) {
4386 while ( max_blocks/2 > (1ULL<<(scale+32)))
4387 scale++;
4388 }
4389 res = (resync>>scale)*1000;
4390 sector_div(res, (u32)((max_blocks>>scale)+1));
4391
4392 per_milli = res;
4393 {
4394 int i, x = per_milli/50, y = 20-x;
4395 seq_printf(seq, "[");
4396 for (i = 0; i < x; i++)
4397 seq_printf(seq, "=");
4398 seq_printf(seq, ">");
4399 for (i = 0; i < y; i++)
4400 seq_printf(seq, ".");
4401 seq_printf(seq, "] ");
4402 }
4403 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4404 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4405 "reshape" :
4406 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4407 "resync" : "recovery")),
4408 per_milli/10, per_milli % 10,
4409 (unsigned long long) resync,
4410 (unsigned long long) max_blocks);
4411
4412 /*
4413 * We do not want to overflow, so the order of operands and
4414 * the * 100 / 100 trick are important. We do a +1 to be
4415 * safe against division by zero. We only estimate anyway.
4416 *
4417 * dt: time from mark until now
4418 * db: blocks written from mark until now
4419 * rt: remaining time
4420 */
4421 dt = ((jiffies - mddev->resync_mark) / HZ);
4422 if (!dt) dt++;
4423 db = resync - (mddev->resync_mark_cnt/2);
4424 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
4425
4426 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4427
4428 seq_printf(seq, " speed=%ldK/sec", db/dt);
4429 }
4430
4431 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4432 {
4433 struct list_head *tmp;
4434 loff_t l = *pos;
4435 mddev_t *mddev;
4436
4437 if (l >= 0x10000)
4438 return NULL;
4439 if (!l--)
4440 /* header */
4441 return (void*)1;
4442
4443 spin_lock(&all_mddevs_lock);
4444 list_for_each(tmp,&all_mddevs)
4445 if (!l--) {
4446 mddev = list_entry(tmp, mddev_t, all_mddevs);
4447 mddev_get(mddev);
4448 spin_unlock(&all_mddevs_lock);
4449 return mddev;
4450 }
4451 spin_unlock(&all_mddevs_lock);
4452 if (!l--)
4453 return (void*)2;/* tail */
4454 return NULL;
4455 }
4456
4457 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4458 {
4459 struct list_head *tmp;
4460 mddev_t *next_mddev, *mddev = v;
4461
4462 ++*pos;
4463 if (v == (void*)2)
4464 return NULL;
4465
4466 spin_lock(&all_mddevs_lock);
4467 if (v == (void*)1)
4468 tmp = all_mddevs.next;
4469 else
4470 tmp = mddev->all_mddevs.next;
4471 if (tmp != &all_mddevs)
4472 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4473 else {
4474 next_mddev = (void*)2;
4475 *pos = 0x10000;
4476 }
4477 spin_unlock(&all_mddevs_lock);
4478
4479 if (v != (void*)1)
4480 mddev_put(mddev);
4481 return next_mddev;
4482
4483 }
4484
4485 static void md_seq_stop(struct seq_file *seq, void *v)
4486 {
4487 mddev_t *mddev = v;
4488
4489 if (mddev && v != (void*)1 && v != (void*)2)
4490 mddev_put(mddev);
4491 }
4492
4493 struct mdstat_info {
4494 int event;
4495 };
4496
4497 static int md_seq_show(struct seq_file *seq, void *v)
4498 {
4499 mddev_t *mddev = v;
4500 sector_t size;
4501 struct list_head *tmp2;
4502 mdk_rdev_t *rdev;
4503 struct mdstat_info *mi = seq->private;
4504 struct bitmap *bitmap;
4505
4506 if (v == (void*)1) {
4507 struct mdk_personality *pers;
4508 seq_printf(seq, "Personalities : ");
4509 spin_lock(&pers_lock);
4510 list_for_each_entry(pers, &pers_list, list)
4511 seq_printf(seq, "[%s] ", pers->name);
4512
4513 spin_unlock(&pers_lock);
4514 seq_printf(seq, "\n");
4515 mi->event = atomic_read(&md_event_count);
4516 return 0;
4517 }
4518 if (v == (void*)2) {
4519 status_unused(seq);
4520 return 0;
4521 }
4522
4523 if (mddev_lock(mddev) < 0)
4524 return -EINTR;
4525
4526 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4527 seq_printf(seq, "%s : %sactive", mdname(mddev),
4528 mddev->pers ? "" : "in");
4529 if (mddev->pers) {
4530 if (mddev->ro==1)
4531 seq_printf(seq, " (read-only)");
4532 if (mddev->ro==2)
4533 seq_printf(seq, "(auto-read-only)");
4534 seq_printf(seq, " %s", mddev->pers->name);
4535 }
4536
4537 size = 0;
4538 ITERATE_RDEV(mddev,rdev,tmp2) {
4539 char b[BDEVNAME_SIZE];
4540 seq_printf(seq, " %s[%d]",
4541 bdevname(rdev->bdev,b), rdev->desc_nr);
4542 if (test_bit(WriteMostly, &rdev->flags))
4543 seq_printf(seq, "(W)");
4544 if (test_bit(Faulty, &rdev->flags)) {
4545 seq_printf(seq, "(F)");
4546 continue;
4547 } else if (rdev->raid_disk < 0)
4548 seq_printf(seq, "(S)"); /* spare */
4549 size += rdev->size;
4550 }
4551
4552 if (!list_empty(&mddev->disks)) {
4553 if (mddev->pers)
4554 seq_printf(seq, "\n %llu blocks",
4555 (unsigned long long)mddev->array_size);
4556 else
4557 seq_printf(seq, "\n %llu blocks",
4558 (unsigned long long)size);
4559 }
4560 if (mddev->persistent) {
4561 if (mddev->major_version != 0 ||
4562 mddev->minor_version != 90) {
4563 seq_printf(seq," super %d.%d",
4564 mddev->major_version,
4565 mddev->minor_version);
4566 }
4567 } else
4568 seq_printf(seq, " super non-persistent");
4569
4570 if (mddev->pers) {
4571 mddev->pers->status (seq, mddev);
4572 seq_printf(seq, "\n ");
4573 if (mddev->pers->sync_request) {
4574 if (mddev->curr_resync > 2) {
4575 status_resync (seq, mddev);
4576 seq_printf(seq, "\n ");
4577 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4578 seq_printf(seq, "\tresync=DELAYED\n ");
4579 else if (mddev->recovery_cp < MaxSector)
4580 seq_printf(seq, "\tresync=PENDING\n ");
4581 }
4582 } else
4583 seq_printf(seq, "\n ");
4584
4585 if ((bitmap = mddev->bitmap)) {
4586 unsigned long chunk_kb;
4587 unsigned long flags;
4588 spin_lock_irqsave(&bitmap->lock, flags);
4589 chunk_kb = bitmap->chunksize >> 10;
4590 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4591 "%lu%s chunk",
4592 bitmap->pages - bitmap->missing_pages,
4593 bitmap->pages,
4594 (bitmap->pages - bitmap->missing_pages)
4595 << (PAGE_SHIFT - 10),
4596 chunk_kb ? chunk_kb : bitmap->chunksize,
4597 chunk_kb ? "KB" : "B");
4598 if (bitmap->file) {
4599 seq_printf(seq, ", file: ");
4600 seq_path(seq, bitmap->file->f_vfsmnt,
4601 bitmap->file->f_dentry," \t\n");
4602 }
4603
4604 seq_printf(seq, "\n");
4605 spin_unlock_irqrestore(&bitmap->lock, flags);
4606 }
4607
4608 seq_printf(seq, "\n");
4609 }
4610 mddev_unlock(mddev);
4611
4612 return 0;
4613 }
4614
4615 static struct seq_operations md_seq_ops = {
4616 .start = md_seq_start,
4617 .next = md_seq_next,
4618 .stop = md_seq_stop,
4619 .show = md_seq_show,
4620 };
4621
4622 static int md_seq_open(struct inode *inode, struct file *file)
4623 {
4624 int error;
4625 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4626 if (mi == NULL)
4627 return -ENOMEM;
4628
4629 error = seq_open(file, &md_seq_ops);
4630 if (error)
4631 kfree(mi);
4632 else {
4633 struct seq_file *p = file->private_data;
4634 p->private = mi;
4635 mi->event = atomic_read(&md_event_count);
4636 }
4637 return error;
4638 }
4639
4640 static int md_seq_release(struct inode *inode, struct file *file)
4641 {
4642 struct seq_file *m = file->private_data;
4643 struct mdstat_info *mi = m->private;
4644 m->private = NULL;
4645 kfree(mi);
4646 return seq_release(inode, file);
4647 }
4648
4649 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4650 {
4651 struct seq_file *m = filp->private_data;
4652 struct mdstat_info *mi = m->private;
4653 int mask;
4654
4655 poll_wait(filp, &md_event_waiters, wait);
4656
4657 /* always allow read */
4658 mask = POLLIN | POLLRDNORM;
4659
4660 if (mi->event != atomic_read(&md_event_count))
4661 mask |= POLLERR | POLLPRI;
4662 return mask;
4663 }
4664
4665 static struct file_operations md_seq_fops = {
4666 .open = md_seq_open,
4667 .read = seq_read,
4668 .llseek = seq_lseek,
4669 .release = md_seq_release,
4670 .poll = mdstat_poll,
4671 };
4672
4673 int register_md_personality(struct mdk_personality *p)
4674 {
4675 spin_lock(&pers_lock);
4676 list_add_tail(&p->list, &pers_list);
4677 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4678 spin_unlock(&pers_lock);
4679 return 0;
4680 }
4681
4682 int unregister_md_personality(struct mdk_personality *p)
4683 {
4684 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4685 spin_lock(&pers_lock);
4686 list_del_init(&p->list);
4687 spin_unlock(&pers_lock);
4688 return 0;
4689 }
4690
4691 static int is_mddev_idle(mddev_t *mddev)
4692 {
4693 mdk_rdev_t * rdev;
4694 struct list_head *tmp;
4695 int idle;
4696 unsigned long curr_events;
4697
4698 idle = 1;
4699 ITERATE_RDEV(mddev,rdev,tmp) {
4700 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
4701 curr_events = disk_stat_read(disk, sectors[0]) +
4702 disk_stat_read(disk, sectors[1]) -
4703 atomic_read(&disk->sync_io);
4704 /* The difference between curr_events and last_events
4705 * will be affected by any new non-sync IO (making
4706 * curr_events bigger) and any difference in the amount of
4707 * in-flight syncio (making current_events bigger or smaller)
4708 * The amount in-flight is currently limited to
4709 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4710 * which is at most 4096 sectors.
4711 * These numbers are fairly fragile and should be made
4712 * more robust, probably by enforcing the
4713 * 'window size' that md_do_sync sort-of uses.
4714 *
4715 * Note: the following is an unsigned comparison.
4716 */
4717 if ((curr_events - rdev->last_events + 4096) > 8192) {
4718 rdev->last_events = curr_events;
4719 idle = 0;
4720 }
4721 }
4722 return idle;
4723 }
4724
4725 void md_done_sync(mddev_t *mddev, int blocks, int ok)
4726 {
4727 /* another "blocks" (512byte) blocks have been synced */
4728 atomic_sub(blocks, &mddev->recovery_active);
4729 wake_up(&mddev->recovery_wait);
4730 if (!ok) {
4731 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4732 md_wakeup_thread(mddev->thread);
4733 // stop recovery, signal do_sync ....
4734 }
4735 }
4736
4737
4738 /* md_write_start(mddev, bi)
4739 * If we need to update some array metadata (e.g. 'active' flag
4740 * in superblock) before writing, schedule a superblock update
4741 * and wait for it to complete.
4742 */
4743 void md_write_start(mddev_t *mddev, struct bio *bi)
4744 {
4745 if (bio_data_dir(bi) != WRITE)
4746 return;
4747
4748 BUG_ON(mddev->ro == 1);
4749 if (mddev->ro == 2) {
4750 /* need to switch to read/write */
4751 mddev->ro = 0;
4752 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4753 md_wakeup_thread(mddev->thread);
4754 }
4755 atomic_inc(&mddev->writes_pending);
4756 if (mddev->in_sync) {
4757 spin_lock_irq(&mddev->write_lock);
4758 if (mddev->in_sync) {
4759 mddev->in_sync = 0;
4760 mddev->sb_dirty = 3;
4761 md_wakeup_thread(mddev->thread);
4762 }
4763 spin_unlock_irq(&mddev->write_lock);
4764 }
4765 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
4766 }
4767
4768 void md_write_end(mddev_t *mddev)
4769 {
4770 if (atomic_dec_and_test(&mddev->writes_pending)) {
4771 if (mddev->safemode == 2)
4772 md_wakeup_thread(mddev->thread);
4773 else if (mddev->safemode_delay)
4774 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4775 }
4776 }
4777
4778 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
4779
4780 #define SYNC_MARKS 10
4781 #define SYNC_MARK_STEP (3*HZ)
4782 void md_do_sync(mddev_t *mddev)
4783 {
4784 mddev_t *mddev2;
4785 unsigned int currspeed = 0,
4786 window;
4787 sector_t max_sectors,j, io_sectors;
4788 unsigned long mark[SYNC_MARKS];
4789 sector_t mark_cnt[SYNC_MARKS];
4790 int last_mark,m;
4791 struct list_head *tmp;
4792 sector_t last_check;
4793 int skipped = 0;
4794 struct list_head *rtmp;
4795 mdk_rdev_t *rdev;
4796
4797 /* just incase thread restarts... */
4798 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4799 return;
4800 if (mddev->ro) /* never try to sync a read-only array */
4801 return;
4802
4803 /* we overload curr_resync somewhat here.
4804 * 0 == not engaged in resync at all
4805 * 2 == checking that there is no conflict with another sync
4806 * 1 == like 2, but have yielded to allow conflicting resync to
4807 * commense
4808 * other == active in resync - this many blocks
4809 *
4810 * Before starting a resync we must have set curr_resync to
4811 * 2, and then checked that every "conflicting" array has curr_resync
4812 * less than ours. When we find one that is the same or higher
4813 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4814 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4815 * This will mean we have to start checking from the beginning again.
4816 *
4817 */
4818
4819 do {
4820 mddev->curr_resync = 2;
4821
4822 try_again:
4823 if (kthread_should_stop()) {
4824 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4825 goto skip;
4826 }
4827 ITERATE_MDDEV(mddev2,tmp) {
4828 if (mddev2 == mddev)
4829 continue;
4830 if (mddev2->curr_resync &&
4831 match_mddev_units(mddev,mddev2)) {
4832 DEFINE_WAIT(wq);
4833 if (mddev < mddev2 && mddev->curr_resync == 2) {
4834 /* arbitrarily yield */
4835 mddev->curr_resync = 1;
4836 wake_up(&resync_wait);
4837 }
4838 if (mddev > mddev2 && mddev->curr_resync == 1)
4839 /* no need to wait here, we can wait the next
4840 * time 'round when curr_resync == 2
4841 */
4842 continue;
4843 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4844 if (!kthread_should_stop() &&
4845 mddev2->curr_resync >= mddev->curr_resync) {
4846 printk(KERN_INFO "md: delaying resync of %s"
4847 " until %s has finished resync (they"
4848 " share one or more physical units)\n",
4849 mdname(mddev), mdname(mddev2));
4850 mddev_put(mddev2);
4851 schedule();
4852 finish_wait(&resync_wait, &wq);
4853 goto try_again;
4854 }
4855 finish_wait(&resync_wait, &wq);
4856 }
4857 }
4858 } while (mddev->curr_resync < 2);
4859
4860 j = 0;
4861 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4862 /* resync follows the size requested by the personality,
4863 * which defaults to physical size, but can be virtual size
4864 */
4865 max_sectors = mddev->resync_max_sectors;
4866 mddev->resync_mismatches = 0;
4867 /* we don't use the checkpoint if there's a bitmap */
4868 if (!mddev->bitmap &&
4869 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4870 j = mddev->recovery_cp;
4871 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4872 max_sectors = mddev->size << 1;
4873 else {
4874 /* recovery follows the physical size of devices */
4875 max_sectors = mddev->size << 1;
4876 j = MaxSector;
4877 ITERATE_RDEV(mddev,rdev,rtmp)
4878 if (rdev->raid_disk >= 0 &&
4879 !test_bit(Faulty, &rdev->flags) &&
4880 !test_bit(In_sync, &rdev->flags) &&
4881 rdev->recovery_offset < j)
4882 j = rdev->recovery_offset;
4883 }
4884
4885 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4886 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4887 " %d KB/sec/disc.\n", speed_min(mddev));
4888 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
4889 "(but not more than %d KB/sec) for reconstruction.\n",
4890 speed_max(mddev));
4891
4892 is_mddev_idle(mddev); /* this also initializes IO event counters */
4893
4894 io_sectors = 0;
4895 for (m = 0; m < SYNC_MARKS; m++) {
4896 mark[m] = jiffies;
4897 mark_cnt[m] = io_sectors;
4898 }
4899 last_mark = 0;
4900 mddev->resync_mark = mark[last_mark];
4901 mddev->resync_mark_cnt = mark_cnt[last_mark];
4902
4903 /*
4904 * Tune reconstruction:
4905 */
4906 window = 32*(PAGE_SIZE/512);
4907 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4908 window/2,(unsigned long long) max_sectors/2);
4909
4910 atomic_set(&mddev->recovery_active, 0);
4911 init_waitqueue_head(&mddev->recovery_wait);
4912 last_check = 0;
4913
4914 if (j>2) {
4915 printk(KERN_INFO
4916 "md: resuming recovery of %s from checkpoint.\n",
4917 mdname(mddev));
4918 mddev->curr_resync = j;
4919 }
4920
4921 while (j < max_sectors) {
4922 sector_t sectors;
4923
4924 skipped = 0;
4925 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4926 currspeed < speed_min(mddev));
4927 if (sectors == 0) {
4928 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4929 goto out;
4930 }
4931
4932 if (!skipped) { /* actual IO requested */
4933 io_sectors += sectors;
4934 atomic_add(sectors, &mddev->recovery_active);
4935 }
4936
4937 j += sectors;
4938 if (j>1) mddev->curr_resync = j;
4939 if (last_check == 0)
4940 /* this is the earliers that rebuilt will be
4941 * visible in /proc/mdstat
4942 */
4943 md_new_event(mddev);
4944
4945 if (last_check + window > io_sectors || j == max_sectors)
4946 continue;
4947
4948 last_check = io_sectors;
4949
4950 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4951 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4952 break;
4953
4954 repeat:
4955 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4956 /* step marks */
4957 int next = (last_mark+1) % SYNC_MARKS;
4958
4959 mddev->resync_mark = mark[next];
4960 mddev->resync_mark_cnt = mark_cnt[next];
4961 mark[next] = jiffies;
4962 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
4963 last_mark = next;
4964 }
4965
4966
4967 if (kthread_should_stop()) {
4968 /*
4969 * got a signal, exit.
4970 */
4971 printk(KERN_INFO
4972 "md: md_do_sync() got signal ... exiting\n");
4973 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4974 goto out;
4975 }
4976
4977 /*
4978 * this loop exits only if either when we are slower than
4979 * the 'hard' speed limit, or the system was IO-idle for
4980 * a jiffy.
4981 * the system might be non-idle CPU-wise, but we only care
4982 * about not overloading the IO subsystem. (things like an
4983 * e2fsck being done on the RAID array should execute fast)
4984 */
4985 mddev->queue->unplug_fn(mddev->queue);
4986 cond_resched();
4987
4988 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4989 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4990
4991 if (currspeed > speed_min(mddev)) {
4992 if ((currspeed > speed_max(mddev)) ||
4993 !is_mddev_idle(mddev)) {
4994 msleep(500);
4995 goto repeat;
4996 }
4997 }
4998 }
4999 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
5000 /*
5001 * this also signals 'finished resyncing' to md_stop
5002 */
5003 out:
5004 mddev->queue->unplug_fn(mddev->queue);
5005
5006 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5007
5008 /* tell personality that we are finished */
5009 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5010
5011 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5012 test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
5013 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5014 mddev->curr_resync > 2) {
5015 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5016 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5017 if (mddev->curr_resync >= mddev->recovery_cp) {
5018 printk(KERN_INFO
5019 "md: checkpointing recovery of %s.\n",
5020 mdname(mddev));
5021 mddev->recovery_cp = mddev->curr_resync;
5022 }
5023 } else
5024 mddev->recovery_cp = MaxSector;
5025 } else {
5026 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5027 mddev->curr_resync = MaxSector;
5028 ITERATE_RDEV(mddev,rdev,rtmp)
5029 if (rdev->raid_disk >= 0 &&
5030 !test_bit(Faulty, &rdev->flags) &&
5031 !test_bit(In_sync, &rdev->flags) &&
5032 rdev->recovery_offset < mddev->curr_resync)
5033 rdev->recovery_offset = mddev->curr_resync;
5034 mddev->sb_dirty = 1;
5035 }
5036 }
5037
5038 skip:
5039 mddev->curr_resync = 0;
5040 wake_up(&resync_wait);
5041 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5042 md_wakeup_thread(mddev->thread);
5043 }
5044 EXPORT_SYMBOL_GPL(md_do_sync);
5045
5046
5047 /*
5048 * This routine is regularly called by all per-raid-array threads to
5049 * deal with generic issues like resync and super-block update.
5050 * Raid personalities that don't have a thread (linear/raid0) do not
5051 * need this as they never do any recovery or update the superblock.
5052 *
5053 * It does not do any resync itself, but rather "forks" off other threads
5054 * to do that as needed.
5055 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5056 * "->recovery" and create a thread at ->sync_thread.
5057 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5058 * and wakeups up this thread which will reap the thread and finish up.
5059 * This thread also removes any faulty devices (with nr_pending == 0).
5060 *
5061 * The overall approach is:
5062 * 1/ if the superblock needs updating, update it.
5063 * 2/ If a recovery thread is running, don't do anything else.
5064 * 3/ If recovery has finished, clean up, possibly marking spares active.
5065 * 4/ If there are any faulty devices, remove them.
5066 * 5/ If array is degraded, try to add spares devices
5067 * 6/ If array has spares or is not in-sync, start a resync thread.
5068 */
5069 void md_check_recovery(mddev_t *mddev)
5070 {
5071 mdk_rdev_t *rdev;
5072 struct list_head *rtmp;
5073
5074
5075 if (mddev->bitmap)
5076 bitmap_daemon_work(mddev->bitmap);
5077
5078 if (mddev->ro)
5079 return;
5080
5081 if (signal_pending(current)) {
5082 if (mddev->pers->sync_request) {
5083 printk(KERN_INFO "md: %s in immediate safe mode\n",
5084 mdname(mddev));
5085 mddev->safemode = 2;
5086 }
5087 flush_signals(current);
5088 }
5089
5090 if ( ! (
5091 mddev->sb_dirty ||
5092 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5093 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5094 (mddev->safemode == 1) ||
5095 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5096 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5097 ))
5098 return;
5099
5100 if (mddev_trylock(mddev)) {
5101 int spares =0;
5102
5103 spin_lock_irq(&mddev->write_lock);
5104 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5105 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5106 mddev->in_sync = 1;
5107 mddev->sb_dirty = 3;
5108 }
5109 if (mddev->safemode == 1)
5110 mddev->safemode = 0;
5111 spin_unlock_irq(&mddev->write_lock);
5112
5113 if (mddev->sb_dirty)
5114 md_update_sb(mddev);
5115
5116
5117 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5118 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5119 /* resync/recovery still happening */
5120 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5121 goto unlock;
5122 }
5123 if (mddev->sync_thread) {
5124 /* resync has finished, collect result */
5125 md_unregister_thread(mddev->sync_thread);
5126 mddev->sync_thread = NULL;
5127 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5128 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5129 /* success...*/
5130 /* activate any spares */
5131 mddev->pers->spare_active(mddev);
5132 }
5133 md_update_sb(mddev);
5134
5135 /* if array is no-longer degraded, then any saved_raid_disk
5136 * information must be scrapped
5137 */
5138 if (!mddev->degraded)
5139 ITERATE_RDEV(mddev,rdev,rtmp)
5140 rdev->saved_raid_disk = -1;
5141
5142 mddev->recovery = 0;
5143 /* flag recovery needed just to double check */
5144 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5145 md_new_event(mddev);
5146 goto unlock;
5147 }
5148 /* Clear some bits that don't mean anything, but
5149 * might be left set
5150 */
5151 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5152 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5153 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5154 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
5155
5156 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5157 goto unlock;
5158 /* no recovery is running.
5159 * remove any failed drives, then
5160 * add spares if possible.
5161 * Spare are also removed and re-added, to allow
5162 * the personality to fail the re-add.
5163 */
5164 ITERATE_RDEV(mddev,rdev,rtmp)
5165 if (rdev->raid_disk >= 0 &&
5166 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
5167 atomic_read(&rdev->nr_pending)==0) {
5168 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
5169 char nm[20];
5170 sprintf(nm,"rd%d", rdev->raid_disk);
5171 sysfs_remove_link(&mddev->kobj, nm);
5172 rdev->raid_disk = -1;
5173 }
5174 }
5175
5176 if (mddev->degraded) {
5177 ITERATE_RDEV(mddev,rdev,rtmp)
5178 if (rdev->raid_disk < 0
5179 && !test_bit(Faulty, &rdev->flags)) {
5180 rdev->recovery_offset = 0;
5181 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5182 char nm[20];
5183 sprintf(nm, "rd%d", rdev->raid_disk);
5184 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
5185 spares++;
5186 md_new_event(mddev);
5187 } else
5188 break;
5189 }
5190 }
5191
5192 if (spares) {
5193 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5194 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5195 } else if (mddev->recovery_cp < MaxSector) {
5196 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5197 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5198 /* nothing to be done ... */
5199 goto unlock;
5200
5201 if (mddev->pers->sync_request) {
5202 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
5203 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5204 /* We are adding a device or devices to an array
5205 * which has the bitmap stored on all devices.
5206 * So make sure all bitmap pages get written
5207 */
5208 bitmap_write_all(mddev->bitmap);
5209 }
5210 mddev->sync_thread = md_register_thread(md_do_sync,
5211 mddev,
5212 "%s_resync");
5213 if (!mddev->sync_thread) {
5214 printk(KERN_ERR "%s: could not start resync"
5215 " thread...\n",
5216 mdname(mddev));
5217 /* leave the spares where they are, it shouldn't hurt */
5218 mddev->recovery = 0;
5219 } else
5220 md_wakeup_thread(mddev->sync_thread);
5221 md_new_event(mddev);
5222 }
5223 unlock:
5224 mddev_unlock(mddev);
5225 }
5226 }
5227
5228 static int md_notify_reboot(struct notifier_block *this,
5229 unsigned long code, void *x)
5230 {
5231 struct list_head *tmp;
5232 mddev_t *mddev;
5233
5234 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5235
5236 printk(KERN_INFO "md: stopping all md devices.\n");
5237
5238 ITERATE_MDDEV(mddev,tmp)
5239 if (mddev_trylock(mddev)) {
5240 do_md_stop (mddev, 1);
5241 mddev_unlock(mddev);
5242 }
5243 /*
5244 * certain more exotic SCSI devices are known to be
5245 * volatile wrt too early system reboots. While the
5246 * right place to handle this issue is the given
5247 * driver, we do want to have a safe RAID driver ...
5248 */
5249 mdelay(1000*1);
5250 }
5251 return NOTIFY_DONE;
5252 }
5253
5254 static struct notifier_block md_notifier = {
5255 .notifier_call = md_notify_reboot,
5256 .next = NULL,
5257 .priority = INT_MAX, /* before any real devices */
5258 };
5259
5260 static void md_geninit(void)
5261 {
5262 struct proc_dir_entry *p;
5263
5264 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5265
5266 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5267 if (p)
5268 p->proc_fops = &md_seq_fops;
5269 }
5270
5271 static int __init md_init(void)
5272 {
5273 int minor;
5274
5275 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5276 " MD_SB_DISKS=%d\n",
5277 MD_MAJOR_VERSION, MD_MINOR_VERSION,
5278 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
5279 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
5280 BITMAP_MINOR);
5281
5282 if (register_blkdev(MAJOR_NR, "md"))
5283 return -1;
5284 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5285 unregister_blkdev(MAJOR_NR, "md");
5286 return -1;
5287 }
5288 devfs_mk_dir("md");
5289 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
5290 md_probe, NULL, NULL);
5291 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
5292 md_probe, NULL, NULL);
5293
5294 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5295 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
5296 S_IFBLK|S_IRUSR|S_IWUSR,
5297 "md/%d", minor);
5298
5299 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5300 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
5301 S_IFBLK|S_IRUSR|S_IWUSR,
5302 "md/mdp%d", minor);
5303
5304
5305 register_reboot_notifier(&md_notifier);
5306 raid_table_header = register_sysctl_table(raid_root_table, 1);
5307
5308 md_geninit();
5309 return (0);
5310 }
5311
5312
5313 #ifndef MODULE
5314
5315 /*
5316 * Searches all registered partitions for autorun RAID arrays
5317 * at boot time.
5318 */
5319 static dev_t detected_devices[128];
5320 static int dev_cnt;
5321
5322 void md_autodetect_dev(dev_t dev)
5323 {
5324 if (dev_cnt >= 0 && dev_cnt < 127)
5325 detected_devices[dev_cnt++] = dev;
5326 }
5327
5328
5329 static void autostart_arrays(int part)
5330 {
5331 mdk_rdev_t *rdev;
5332 int i;
5333
5334 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5335
5336 for (i = 0; i < dev_cnt; i++) {
5337 dev_t dev = detected_devices[i];
5338
5339 rdev = md_import_device(dev,0, 0);
5340 if (IS_ERR(rdev))
5341 continue;
5342
5343 if (test_bit(Faulty, &rdev->flags)) {
5344 MD_BUG();
5345 continue;
5346 }
5347 list_add(&rdev->same_set, &pending_raid_disks);
5348 }
5349 dev_cnt = 0;
5350
5351 autorun_devices(part);
5352 }
5353
5354 #endif
5355
5356 static __exit void md_exit(void)
5357 {
5358 mddev_t *mddev;
5359 struct list_head *tmp;
5360 int i;
5361 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5362 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
5363 for (i=0; i < MAX_MD_DEVS; i++)
5364 devfs_remove("md/%d", i);
5365 for (i=0; i < MAX_MD_DEVS; i++)
5366 devfs_remove("md/d%d", i);
5367
5368 devfs_remove("md");
5369
5370 unregister_blkdev(MAJOR_NR,"md");
5371 unregister_blkdev(mdp_major, "mdp");
5372 unregister_reboot_notifier(&md_notifier);
5373 unregister_sysctl_table(raid_table_header);
5374 remove_proc_entry("mdstat", NULL);
5375 ITERATE_MDDEV(mddev,tmp) {
5376 struct gendisk *disk = mddev->gendisk;
5377 if (!disk)
5378 continue;
5379 export_array(mddev);
5380 del_gendisk(disk);
5381 put_disk(disk);
5382 mddev->gendisk = NULL;
5383 mddev_put(mddev);
5384 }
5385 }
5386
5387 module_init(md_init)
5388 module_exit(md_exit)
5389
5390 static int get_ro(char *buffer, struct kernel_param *kp)
5391 {
5392 return sprintf(buffer, "%d", start_readonly);
5393 }
5394 static int set_ro(const char *val, struct kernel_param *kp)
5395 {
5396 char *e;
5397 int num = simple_strtoul(val, &e, 10);
5398 if (*val && (*e == '\0' || *e == '\n')) {
5399 start_readonly = num;
5400 return 0;
5401 }
5402 return -EINVAL;
5403 }
5404
5405 module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
5406 module_param(start_dirty_degraded, int, 0644);
5407
5408
5409 EXPORT_SYMBOL(register_md_personality);
5410 EXPORT_SYMBOL(unregister_md_personality);
5411 EXPORT_SYMBOL(md_error);
5412 EXPORT_SYMBOL(md_done_sync);
5413 EXPORT_SYMBOL(md_write_start);
5414 EXPORT_SYMBOL(md_write_end);
5415 EXPORT_SYMBOL(md_register_thread);
5416 EXPORT_SYMBOL(md_unregister_thread);
5417 EXPORT_SYMBOL(md_wakeup_thread);
5418 EXPORT_SYMBOL(md_check_recovery);
5419 MODULE_LICENSE("GPL");
5420 MODULE_ALIAS("md");
5421 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
Linux 2.6 libata-dev (mirror)