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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-next
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / md / md.h
CommitLineData
1da177e4 1/*
7e841526 2 md.h : kernel internal structure of the Linux MD driver
1da177e4
LT		 3 Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 You should have received a copy of the GNU General Public License
11 (for example /usr/src/linux/COPYING); if not, write to the Free
12 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
13*/
14
63fe0817
CH		 15#ifndef _MD_MD_H
16#define _MD_MD_H
17
18#include <linux/blkdev.h>
19#include <linux/kobject.h>
20#include <linux/list.h>
21#include <linux/mm.h>
22#include <linux/mutex.h>
23#include <linux/timer.h>
24#include <linux/wait.h>
25#include <linux/workqueue.h>
9361401e 26
1da177e4 27#define MaxSector (~(sector_t)0)
1da177e4 28
2230dfe4
N		 29/* Bad block numbers are stored sorted in a single page.
30 * 64bits is used for each block or extent.
31 * 54 bits are sector number, 9 bits are extent size,
32 * 1 bit is an 'acknowledged' flag.
33 */
34#define MD_MAX_BADBLOCKS (PAGE_SIZE/8)
35
1da177e4
LT		 36/*
37 * MD's 'extended' device
38 */
3cb03002 39struct md_rdev {
1da177e4
LT		 40 struct list_head same_set; /* RAID devices within the same set */
41
dd8ac336 42 sector_t sectors; /* Device size (in 512bytes sectors) */
fd01b88c 43 struct mddev *mddev; /* RAID array if running */
eea1bf38 44 int last_events; /* IO event timestamp */
1da177e4 45
a6ff7e08
JB		 46 /*
47 * If meta_bdev is non-NULL, it means that a separate device is
48 * being used to store the metadata (superblock/bitmap) which
49 * would otherwise be contained on the same device as the data (bdev).
50 */
51 struct block_device *meta_bdev;
1da177e4
LT		 52 struct block_device *bdev; /* block device handle */
53
2699b672 54 struct page *sb_page, *bb_page;
1da177e4 55 int sb_loaded;
42543769 56 __u64 sb_events;
1da177e4 57 sector_t data_offset; /* start of data in array */
0f420358 58 sector_t sb_start; /* offset of the super block (in 512byte sectors) */
0002b271 59 int sb_size; /* bytes in the superblock */
1da177e4
LT		 60 int preferred_minor; /* autorun support */
61
86e6ffdd
N		 62 struct kobject kobj;
63
1da177e4
LT		 64 /* A device can be in one of three states based on two flags:
65 * Not working: faulty==1 in_sync==0
66 * Fully working: faulty==0 in_sync==1
67 * Working, but not
68 * in sync with array
69 * faulty==0 in_sync==0
70 *
71 * It can never have faulty==1, in_sync==1
72 * This reduces the burden of testing multiple flags in many cases
73 */
1da177e4 74
b2d444d7
N		 75 unsigned long flags;
76#define Faulty 1 /* device is known to have a fault */
77#define In_sync 2 /* device is in_sync with rest of array */
8ddf9efe 78#define WriteMostly 4 /* Avoid reading if at all possible */
d0fae18f 79#define AutoDetected 7 /* added by auto-detect */
de393cde
N		 80#define Blocked 8 /* An error occurred but has not yet
81 * been acknowledged by the metadata
82 * handler, so don't allow writes
6bfe0b49 83 * until it is cleared */
d7a9d443
N		 84#define WriteErrorSeen 9 /* A write error has been seen on this
85 * device
86 */
de393cde
N		 87#define FaultRecorded 10 /* Intermediate state for clearing
88 * Blocked. The Fault is/will-be
89 * recorded in the metadata, but that
90 * metadata hasn't been stored safely
91 * on disk yet.
92 */
93#define BlockedBadBlocks 11 /* A writer is blocked because they
94 * found an unacknowledged bad-block.
95 * This can safely be cleared at any
96 * time, and the writer will re-check.
97 * It may be set at any time, and at
98 * worst the writer will timeout and
99 * re-check. So setting it as
100 * accurately as possible is good, but
101 * not absolutely critical.
102 */
6bfe0b49 103 wait_queue_head_t blocked_wait;
8ddf9efe 104
1da177e4
LT		 105 int desc_nr; /* descriptor index in the superblock */
106 int raid_disk; /* role of device in array */
e93f68a1
N		 107 int new_raid_disk; /* role that the device will have in
108 * the array after a level-change completes.
109 */
41158c7e
N		 110 int saved_raid_disk; /* role that device used to have in the
111 * array and could again if we did a partial
112 * resync from the bitmap
113 */
5fd6c1dc
N		 114 sector_t recovery_offset;/* If this device has been partially
115 * recovered, this is where we were
116 * up to.
117 */
1da177e4
LT		 118
119 atomic_t nr_pending; /* number of pending requests.
120 * only maintained for arrays that
121 * support hot removal
122 */
ba22dcbf
N		 123 atomic_t read_errors; /* number of consecutive read errors that
124 * we have tried to ignore.
125 */
1e50915f
RB		 126 struct timespec last_read_error; /* monotonic time since our
127 * last read error
128 */
4dbcdc75
N		 129 atomic_t corrected_errors; /* number of corrected read errors,
130 * for reporting to userspace and storing
131 * in superblock.
132 */
5792a285 133 struct work_struct del_work; /* used for delayed sysfs removal */
3c0ee63a
N		 134
135 struct sysfs_dirent *sysfs_state; /* handle for 'state'
136 * sysfs entry */
2230dfe4
N		 137
138 struct badblocks {
139 int count; /* count of bad blocks */
de393cde
N		 140 int unacked_exist; /* there probably are unacknowledged
141 * bad blocks. This is only cleared
142 * when a read discovers none
143 */
2230dfe4
N		 144 int shift; /* shift from sectors to block size
145 * a -ve shift means badblocks are
146 * disabled.*/
147 u64 *page; /* badblock list */
148 int changed;
149 seqlock_t lock;
2699b672
N		 150
151 sector_t sector;
152 sector_t size; /* in sectors */
2230dfe4 153 } badblocks;
1da177e4
LT		 154};
155
2230dfe4
N		 156#define BB_LEN_MASK (0x00000000000001FFULL)
157#define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL)
158#define BB_ACK_MASK (0x8000000000000000ULL)
159#define BB_MAX_LEN 512
160#define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)
161#define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)
162#define BB_ACK(x) (!!((x) & BB_ACK_MASK))
163#define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
164
165extern int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
166 sector_t *first_bad, int *bad_sectors);
3cb03002 167static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors,
2230dfe4
N		 168 sector_t *first_bad, int *bad_sectors)
169{
170 if (unlikely(rdev->badblocks.count)) {
171 int rv = md_is_badblock(&rdev->badblocks, rdev->data_offset + s,
172 sectors,
173 first_bad, bad_sectors);
174 if (rv)
175 *first_bad -= rdev->data_offset;
176 return rv;
177 }
178 return 0;
179}
3cb03002 180extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
2230dfe4 181 int acknowledged);
3cb03002 182extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors);
2230dfe4
N		 183extern void md_ack_all_badblocks(struct badblocks *bb);
184
fd01b88c 185struct mddev {
1da177e4 186 void *private;
84fc4b56 187 struct md_personality *pers;
1da177e4
LT		 188 dev_t unit;
189 int md_minor;
190 struct list_head disks;
850b2b42
N		 191 unsigned long flags;
192#define MD_CHANGE_DEVS 0 /* Some device status has changed */
193#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
070dc6dd 194#define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */
9c81075f 195#define MD_ARRAY_FIRST_USE 3 /* First use of array, needs initialization */
850b2b42 196
409c57f3
N		 197 int suspended;
198 atomic_t active_io;
1da177e4 199 int ro;
bb4f1e9d
N		 200 int sysfs_active; /* set when sysfs deletes
201 * are happening, so run/
202 * takeover/stop are not safe
203 */
0ca69886
N		 204 int ready; /* See when safe to pass
205 * IO requests down */
1da177e4
LT		 206 struct gendisk *gendisk;
207
eae1701f 208 struct kobject kobj;
d3374825
N		 209 int hold_active;
210#define UNTIL_IOCTL 1
efeb53c0 211#define UNTIL_STOP 2
eae1701f 212
1da177e4
LT		 213 /* Superblock information */
214 int major_version,
215 minor_version,
216 patch_version;
217 int persistent;
e691063a
N		 218 int external; /* metadata is
219 * managed externally */
220 char metadata_type[17]; /* externally set*/
9d8f0363 221 int chunk_sectors;
1da177e4
LT		 222 time_t ctime, utime;
223 int level, layout;
d9d166c2 224 char clevel[16];
1da177e4
LT		 225 int raid_disks;
226 int max_disks;
58c0fed4
AN		 227 sector_t dev_sectors; /* used size of
228 * component devices */
f233ea5c 229 sector_t array_sectors; /* exported array size */
b522adcd
DW		 230 int external_size; /* size managed
231 * externally */
1da177e4 232 __u64 events;
a8707c08
N		 233 /* If the last 'event' was simply a clean->dirty transition, and
234 * we didn't write it to the spares, then it is safe and simple
235 * to just decrement the event count on a dirty->clean transition.
236 * So we record that possibility here.
237 */
238 int can_decrease_events;
1da177e4
LT		 239
240 char uuid[16];
241
f6705578
N		 242 /* If the array is being reshaped, we need to record the
243 * new shape and an indication of where we are up to.
244 * This is written to the superblock.
245 * If reshape_position is MaxSector, then no reshape is happening (yet).
246 */
247 sector_t reshape_position;
664e7c41
AN		 248 int delta_disks, new_level, new_layout;
249 int new_chunk_sectors;
f6705578 250
97658cdd
N		 251 atomic_t plug_cnt; /* If device is expecting
252 * more bios soon.
253 */
2b8bf345
N		 254 struct md_thread *thread; /* management thread */
255 struct md_thread *sync_thread; /* doing resync or reconstruct */
ff4e8d9a 256 sector_t curr_resync; /* last block scheduled */
97e4f42d
N		 257 /* As resync requests can complete out of order, we cannot easily track
258 * how much resync has been completed. So we occasionally pause until
259 * everything completes, then set curr_resync_completed to curr_resync.
260 * As such it may be well behind the real resync mark, but it is a value
261 * we are certain of.
262 */
263 sector_t curr_resync_completed;
1da177e4
LT		 264 unsigned long resync_mark; /* a recent timestamp */
265 sector_t resync_mark_cnt;/* blocks written at resync_mark */
ff4e8d9a 266 sector_t curr_mark_cnt; /* blocks scheduled now */
1da177e4
LT		 267
268 sector_t resync_max_sectors; /* may be set by personality */
9d88883e
N		 269
270 sector_t resync_mismatches; /* count of sectors where
271 * parity/replica mismatch found
272 */
e464eafd
N		 273
274 /* allow user-space to request suspension of IO to regions of the array */
275 sector_t suspend_lo;
276 sector_t suspend_hi;
88202a0c
N		 277 /* if zero, use the system-wide default */
278 int sync_speed_min;
279 int sync_speed_max;
280
90b08710
BS		 281 /* resync even though the same disks are shared among md-devices */
282 int parallel_resync;
283
6ff8d8ec 284 int ok_start_degraded;
1da177e4
LT		 285 /* recovery/resync flags
286 * NEEDED: we might need to start a resync/recover
287 * RUNNING: a thread is running, or about to be started
288 * SYNC: actually doing a resync, not a recovery
72a23c21 289 * RECOVER: doing recovery, or need to try it.
dfc70645 290 * INTR: resync needs to be aborted for some reason
1da177e4 291 * DONE: thread is done and is waiting to be reaped
24dd469d 292 * REQUEST: user-space has requested a sync (used with SYNC)
411c9403 293 * CHECK: user-space request for check-only, no repair
ccfcc3c1
N		 294 * RESHAPE: A reshape is happening
295 *
296 * If neither SYNC or RESHAPE are set, then it is a recovery.
1da177e4
LT		 297 */
298#define MD_RECOVERY_RUNNING 0
299#define MD_RECOVERY_SYNC 1
72a23c21 300#define MD_RECOVERY_RECOVER 2
1da177e4
LT		 301#define MD_RECOVERY_INTR 3
302#define MD_RECOVERY_DONE 4
303#define MD_RECOVERY_NEEDED 5
24dd469d
N		 304#define MD_RECOVERY_REQUESTED 6
305#define MD_RECOVERY_CHECK 7
ccfcc3c1 306#define MD_RECOVERY_RESHAPE 8
5fd6c1dc
N		 307#define MD_RECOVERY_FROZEN 9
308
1da177e4 309 unsigned long recovery;
5389042f
N		 310 /* If a RAID personality determines that recovery (of a particular
311 * device) will fail due to a read error on the source device, it
312 * takes a copy of this number and does not attempt recovery again
313 * until this number changes.
314 */
315 int recovery_disabled;
1da177e4
LT		 316
317 int in_sync; /* know to not need resync */
c8c00a69
N		 318 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so
319 * that we are never stopping an array while it is open.
320 * 'reconfig_mutex' protects all other reconfiguration.
321 * These locks are separate due to conflicting interactions
322 * with bdev->bd_mutex.
323 * Lock ordering is:
324 * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk
325 * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open
326 */
327 struct mutex open_mutex;
df5b89b3 328 struct mutex reconfig_mutex;
f2ea68cf
N		 329 atomic_t active; /* general refcount */
330 atomic_t openers; /* number of active opens */
1da177e4 331
f0b4f7e2
N		 332 int changed; /* True if we might need to
333 * reread partition info */
1da177e4
LT		 334 int degraded; /* whether md should consider
335 * adding a spare
336 */
337
338 atomic_t recovery_active; /* blocks scheduled, but not written */
339 wait_queue_head_t recovery_wait;
340 sector_t recovery_cp;
5e96ee65
NB		 341 sector_t resync_min; /* user requested sync
342 * starts here */
c6207277
N		 343 sector_t resync_max; /* resync should pause
344 * when it gets here */
06d91a5f 345
b62b7590
N		 346 struct sysfs_dirent *sysfs_state; /* handle for 'array_state'
347 * file in sysfs.
348 */
0c3573f1 349 struct sysfs_dirent *sysfs_action; /* handle for 'sync_action' */
b62b7590 350
d3374825
N		 351 struct work_struct del_work; /* used for delayed sysfs removal */
352
06d91a5f 353 spinlock_t write_lock;
3d310eb7 354 wait_queue_head_t sb_wait; /* for waiting on superblock updates */
7bfa19f2 355 atomic_t pending_writes; /* number of active superblock writes */
06d91a5f 356
1da177e4
LT		 357 unsigned int safemode; /* if set, update "clean" superblock
358 * when no writes pending.
359 */
360 unsigned int safemode_delay;
361 struct timer_list safemode_timer;
362 atomic_t writes_pending;
165125e1 363 struct request_queue *queue; /* for plugging ... */
1da177e4 364
32a7627c 365 struct bitmap *bitmap; /* the bitmap for the device */
c3d9714e
N		 366 struct {
367 struct file *file; /* the bitmap file */
f6af949c 368 loff_t offset; /* offset from superblock of
c3d9714e
N		 369 * start of bitmap. May be
370 * negative, but not '0'
f6af949c
N		 371 * For external metadata, offset
372 * from start of device.
c3d9714e 373 */
f6af949c 374 loff_t default_offset; /* this is the offset to use when
c3d9714e
N		 375 * hot-adding a bitmap. It should
376 * eventually be settable by sysfs.
377 */
378 struct mutex mutex;
42a04b50 379 unsigned long chunksize;
ac2f40be 380 unsigned long daemon_sleep; /* how many jiffies between updates? */
42a04b50 381 unsigned long max_write_behind; /* write-behind mode */
ece5cff0 382 int external;
c3d9714e 383 } bitmap_info;
32a7627c 384
1e50915f 385 atomic_t max_corr_read_errors; /* max read retries */
1da177e4 386 struct list_head all_mddevs;
a2826aa9 387
a64c876f 388 struct attribute_group *to_remove;
252ac522 389
a167f663
N		 390 struct bio_set *bio_set;
391
e9c7469b
TH		 392 /* Generic flush handling.
393 * The last to finish preflush schedules a worker to submit
394 * the rest of the request (without the REQ_FLUSH flag).
a2826aa9 395 */
e9c7469b 396 struct bio *flush_bio;
a2826aa9 397 atomic_t flush_pending;
e9c7469b 398 struct work_struct flush_work;
768a418d 399 struct work_struct event_work; /* used by dm to report failure event */
fd01b88c 400 void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
1da177e4
LT		 401};
402
403
fd01b88c 404static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev)
1da177e4 405{
b2d444d7 406 int faulty = test_bit(Faulty, &rdev->flags);
1da177e4
LT		 407 if (atomic_dec_and_test(&rdev->nr_pending) && faulty)
408 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
409}
410
411static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors)
412{
413 atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io);
414}
415
84fc4b56 416struct md_personality
1da177e4
LT		 417{
418 char *name;
2604b703
N		 419 int level;
420 struct list_head list;
1da177e4 421 struct module *owner;
fd01b88c
N		 422 int (*make_request)(struct mddev *mddev, struct bio *bio);
423 int (*run)(struct mddev *mddev);
424 int (*stop)(struct mddev *mddev);
425 void (*status)(struct seq_file *seq, struct mddev *mddev);
1da177e4
LT		 426 /* error_handler must set ->faulty and clear ->in_sync
427 * if appropriate, and should abort recovery if needed
428 */
fd01b88c
N		 429 void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev);
430 int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev);
431 int (*hot_remove_disk) (struct mddev *mddev, int number);
432 int (*spare_active) (struct mddev *mddev);
433 sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster);
434 int (*resize) (struct mddev *mddev, sector_t sectors);
435 sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks);
436 int (*check_reshape) (struct mddev *mddev);
437 int (*start_reshape) (struct mddev *mddev);
438 void (*finish_reshape) (struct mddev *mddev);
36fa3063
N		 439 /* quiesce moves between quiescence states
440 * 0 - fully active
441 * 1 - no new requests allowed
442 * others - reserved
443 */
fd01b88c 444 void (*quiesce) (struct mddev *mddev, int state);
245f46c2
N		 445 /* takeover is used to transition an array from one
446 * personality to another. The new personality must be able
447 * to handle the data in the current layout.
448 * e.g. 2drive raid1 -> 2drive raid5
449 * ndrive raid5 -> degraded n+1drive raid6 with special layout
450 * If the takeover succeeds, a new 'private' structure is returned.
451 * This needs to be installed and then ->run used to activate the
452 * array.
453 */
fd01b88c 454 void *(*takeover) (struct mddev *mddev);
1da177e4
LT		 455};
456
457
007583c9
N		 458struct md_sysfs_entry {
459 struct attribute attr;
fd01b88c
N		 460 ssize_t (*show)(struct mddev *, char *);
461 ssize_t (*store)(struct mddev *, const char *, size_t);
007583c9 462};
43a70507 463extern struct attribute_group md_bitmap_group;
007583c9 464
00bcb4ac
N		 465static inline struct sysfs_dirent *sysfs_get_dirent_safe(struct sysfs_dirent *sd, char *name)
466{
467 if (sd)
468 return sysfs_get_dirent(sd, NULL, name);
469 return sd;
470}
471static inline void sysfs_notify_dirent_safe(struct sysfs_dirent *sd)
472{
473 if (sd)
474 sysfs_notify_dirent(sd);
475}
476
fd01b88c 477static inline char * mdname (struct mddev * mddev)
1da177e4
LT		 478{
479 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
480}
481
fd01b88c 482static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev)
36fad858
NK		 483{
484 char nm[20];
485 sprintf(nm, "rd%d", rdev->raid_disk);
486 return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
487}
488
fd01b88c 489static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev)
36fad858
NK		 490{
491 char nm[20];
492 sprintf(nm, "rd%d", rdev->raid_disk);
493 sysfs_remove_link(&mddev->kobj, nm);
494}
495
1da177e4
LT		 496/*
497 * iterates through some rdev ringlist. It's safe to remove the
498 * current 'rdev'. Dont touch 'tmp' though.
499 */
159ec1fc
CR		 500#define rdev_for_each_list(rdev, tmp, head) \
501 list_for_each_entry_safe(rdev, tmp, head, same_set)
502
1da177e4
LT		 503/*
504 * iterates through the 'same array disks' ringlist
505 */
d089c6af 506#define rdev_for_each(rdev, tmp, mddev) \
159ec1fc 507 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set)
1da177e4 508
4b80991c
N		 509#define rdev_for_each_rcu(rdev, mddev) \
510 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
511
2b8bf345 512struct md_thread {
fd01b88c
N		 513 void (*run) (struct mddev *mddev);
514 struct mddev *mddev;
1da177e4
LT		 515 wait_queue_head_t wqueue;
516 unsigned long flags;
1da177e4 517 struct task_struct *tsk;
32a7627c 518 unsigned long timeout;
2b8bf345 519};
1da177e4
LT		 520
521#define THREAD_WAKEUP 0
522
523#define __wait_event_lock_irq(wq, condition, lock, cmd) \
524do { \
525 wait_queue_t __wait; \
526 init_waitqueue_entry(&__wait, current); \
527 \
528 add_wait_queue(&wq, &__wait); \
529 for (;;) { \
530 set_current_state(TASK_UNINTERRUPTIBLE); \
531 if (condition) \
532 break; \
533 spin_unlock_irq(&lock); \
534 cmd; \
535 schedule(); \
536 spin_lock_irq(&lock); \
537 } \
538 current->state = TASK_RUNNING; \
539 remove_wait_queue(&wq, &__wait); \
540} while (0)
541
542#define wait_event_lock_irq(wq, condition, lock, cmd) \
543do { \
544 if (condition) \
545 break; \
546 __wait_event_lock_irq(wq, condition, lock, cmd); \
547} while (0)
548
1345b1d8
N		 549static inline void safe_put_page(struct page *p)
550{
551 if (p) put_page(p);
552}
553
84fc4b56
N		 554extern int register_md_personality(struct md_personality *p);
555extern int unregister_md_personality(struct md_personality *p);
2b8bf345
N		 556extern struct md_thread *md_register_thread(
557 void (*run)(struct mddev *mddev),
558 struct mddev *mddev,
559 const char *name);
560extern void md_unregister_thread(struct md_thread **threadp);
561extern void md_wakeup_thread(struct md_thread *thread);
fd01b88c
N		 562extern void md_check_recovery(struct mddev *mddev);
563extern void md_write_start(struct mddev *mddev, struct bio *bi);
564extern void md_write_end(struct mddev *mddev);
565extern void md_done_sync(struct mddev *mddev, int blocks, int ok);
566extern void md_error(struct mddev *mddev, struct md_rdev *rdev);
567
568extern int mddev_congested(struct mddev *mddev, int bits);
569extern void md_flush_request(struct mddev *mddev, struct bio *bio);
570extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
92022950 571 sector_t sector, int size, struct page *page);
fd01b88c 572extern void md_super_wait(struct mddev *mddev);
3cb03002 573extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
ccebd4c4 574 struct page *page, int rw, bool metadata_op);
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N		 575extern void md_do_sync(struct mddev *mddev);
576extern void md_new_event(struct mddev *mddev);
577extern int md_allow_write(struct mddev *mddev);
578extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev);
579extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors);
580extern int md_check_no_bitmap(struct mddev *mddev);
581extern int md_integrity_register(struct mddev *mddev);
582extern void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev);
72e02075 583extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
43a70507 584extern void restore_bitmap_write_access(struct file *file);
63fe0817 585
fd01b88c
N		 586extern void mddev_init(struct mddev *mddev);
587extern int md_run(struct mddev *mddev);
588extern void md_stop(struct mddev *mddev);
589extern void md_stop_writes(struct mddev *mddev);
3cb03002 590extern int md_rdev_init(struct md_rdev *rdev);
63fe0817 591
fd01b88c
N		 592extern void mddev_suspend(struct mddev *mddev);
593extern void mddev_resume(struct mddev *mddev);
a167f663 594extern struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
fd01b88c 595 struct mddev *mddev);
a167f663 596extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
fd01b88c
N		 597 struct mddev *mddev);
598extern int mddev_check_plugged(struct mddev *mddev);
d2eb35ac 599extern void md_trim_bio(struct bio *bio, int offset, int size);
63fe0817 600#endif /* _MD_MD_H */
kernel source for telekom puls (alcatel/mediatek)