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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 md_k.h : kernel internal structure of the Linux MD driver
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
15#ifndef _MD_K_H
16#define _MD_K_H
17
David Howells93614012006-09-30 20:45:40 +020018#ifdef CONFIG_BLOCK
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#define MaxSector (~(sector_t)0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Linus Torvalds1da177e2005-04-16 15:20:36 -070022typedef struct mddev_s mddev_t;
23typedef struct mdk_rdev_s mdk_rdev_t;
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025/*
26 * options passed in raidrun:
27 */
28
NeilBrowne8703fe2006-10-03 01:15:59 -070029/* Currently this must fit in an 'int' */
NeilBrown8932c2e2006-06-26 00:27:36 -070030#define MAX_CHUNK_SIZE (1<<30)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 * MD's 'extended' device
34 */
35struct mdk_rdev_s
36{
37 struct list_head same_set; /* RAID devices within the same set */
38
Andre Nolldd8ac332009-03-31 14:33:13 +110039 sector_t sectors; /* Device size (in 512bytes sectors) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 mddev_t *mddev; /* RAID array if running */
NeilBrowneea1bf32009-03-31 14:27:02 +110041 int last_events; /* IO event timestamp */
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43 struct block_device *bdev; /* block device handle */
44
45 struct page *sb_page;
46 int sb_loaded;
NeilBrown42543762006-06-26 00:27:57 -070047 __u64 sb_events;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 sector_t data_offset; /* start of data in array */
Andre Noll0f420352008-07-11 22:02:23 +100049 sector_t sb_start; /* offset of the super block (in 512byte sectors) */
NeilBrown0002b272005-09-09 16:23:53 -070050 int sb_size; /* bytes in the superblock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 int preferred_minor; /* autorun support */
52
NeilBrown86e6ffd2005-11-08 21:39:24 -080053 struct kobject kobj;
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 /* A device can be in one of three states based on two flags:
56 * Not working: faulty==1 in_sync==0
57 * Fully working: faulty==0 in_sync==1
58 * Working, but not
59 * in sync with array
60 * faulty==0 in_sync==0
61 *
62 * It can never have faulty==1, in_sync==1
63 * This reduces the burden of testing multiple flags in many cases
64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
NeilBrownb2d444d2005-11-08 21:39:31 -080066 unsigned long flags;
67#define Faulty 1 /* device is known to have a fault */
68#define In_sync 2 /* device is in_sync with rest of array */
NeilBrown8ddf9ef2005-09-09 16:23:45 -070069#define WriteMostly 4 /* Avoid reading if at all possible */
NeilBrowna9701a32005-11-08 21:39:34 -080070#define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */
NeilBrownc5d79ad2008-02-06 01:39:54 -080071#define AllReserved 6 /* If whole device is reserved for
72 * one array */
NeilBrownd0fae182008-03-04 14:29:31 -080073#define AutoDetected 7 /* added by auto-detect */
Dan Williams6bfe0b42008-04-30 00:52:32 -070074#define Blocked 8 /* An error occured on an externally
75 * managed array, don't allow writes
76 * until it is cleared */
Neil Brown52664732008-06-28 08:31:44 +100077#define StateChanged 9 /* Faulty or Blocked has changed during
78 * interrupt, so it needs to be
79 * notified by the thread */
Dan Williams6bfe0b42008-04-30 00:52:32 -070080 wait_queue_head_t blocked_wait;
NeilBrown8ddf9ef2005-09-09 16:23:45 -070081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 int desc_nr; /* descriptor index in the superblock */
83 int raid_disk; /* role of device in array */
NeilBrown41158c72005-06-21 17:17:25 -070084 int saved_raid_disk; /* role that device used to have in the
85 * array and could again if we did a partial
86 * resync from the bitmap
87 */
NeilBrown5fd6c1d2006-06-26 00:27:40 -070088 sector_t recovery_offset;/* If this device has been partially
89 * recovered, this is where we were
90 * up to.
91 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 atomic_t nr_pending; /* number of pending requests.
94 * only maintained for arrays that
95 * support hot removal
96 */
NeilBrownba22dcb2005-11-08 21:39:31 -080097 atomic_t read_errors; /* number of consecutive read errors that
98 * we have tried to ignore.
99 */
NeilBrown4dbcdc72006-01-06 00:20:52 -0800100 atomic_t corrected_errors; /* number of corrected read errors,
101 * for reporting to userspace and storing
102 * in superblock.
103 */
NeilBrown5792a282007-04-04 19:08:18 -0700104 struct work_struct del_work; /* used for delayed sysfs removal */
NeilBrown3c0ee632008-10-21 13:25:28 +1100105
106 struct sysfs_dirent *sysfs_state; /* handle for 'state'
107 * sysfs entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108};
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110struct mddev_s
111{
112 void *private;
NeilBrown2604b702006-01-06 00:20:36 -0800113 struct mdk_personality *pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 dev_t unit;
115 int md_minor;
116 struct list_head disks;
NeilBrown850b2b42006-10-03 01:15:46 -0700117 unsigned long flags;
118#define MD_CHANGE_DEVS 0 /* Some device status has changed */
119#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
120#define MD_CHANGE_PENDING 2 /* superblock update in progress */
121
NeilBrown409c57f2009-03-31 14:39:39 +1100122 int suspended;
123 atomic_t active_io;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 int ro;
125
126 struct gendisk *gendisk;
127
NeilBrowneae17012005-11-08 21:39:23 -0800128 struct kobject kobj;
NeilBrownd3374822009-01-09 08:31:10 +1100129 int hold_active;
130#define UNTIL_IOCTL 1
NeilBrownefeb53c2009-01-09 08:31:10 +1100131#define UNTIL_STOP 2
NeilBrowneae17012005-11-08 21:39:23 -0800132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 /* Superblock information */
134 int major_version,
135 minor_version,
136 patch_version;
137 int persistent;
NeilBrowne6910632008-02-06 01:39:51 -0800138 int external; /* metadata is
139 * managed externally */
140 char metadata_type[17]; /* externally set*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 int chunk_size;
142 time_t ctime, utime;
143 int level, layout;
NeilBrownd9d166c2006-01-06 00:20:51 -0800144 char clevel[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 int raid_disks;
146 int max_disks;
Andre Noll58c0fed2009-03-31 14:33:13 +1100147 sector_t dev_sectors; /* used size of
148 * component devices */
Andre Nollf233ea52008-07-21 17:05:22 +1000149 sector_t array_sectors; /* exported array size */
Dan Williamsb522adc2009-03-31 15:00:31 +1100150 int external_size; /* size managed
151 * externally */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 __u64 events;
153
154 char uuid[16];
155
NeilBrownf6705572006-03-27 01:18:11 -0800156 /* If the array is being reshaped, we need to record the
157 * new shape and an indication of where we are up to.
158 * This is written to the superblock.
159 * If reshape_position is MaxSector, then no reshape is happening (yet).
160 */
161 sector_t reshape_position;
162 int delta_disks, new_level, new_layout, new_chunk;
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 struct mdk_thread_s *thread; /* management thread */
165 struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */
NeilBrownff4e8d92006-07-10 04:44:16 -0700166 sector_t curr_resync; /* last block scheduled */
NeilBrown97e4f422009-03-31 14:33:13 +1100167 /* As resync requests can complete out of order, we cannot easily track
168 * how much resync has been completed. So we occasionally pause until
169 * everything completes, then set curr_resync_completed to curr_resync.
170 * As such it may be well behind the real resync mark, but it is a value
171 * we are certain of.
172 */
173 sector_t curr_resync_completed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 unsigned long resync_mark; /* a recent timestamp */
175 sector_t resync_mark_cnt;/* blocks written at resync_mark */
NeilBrownff4e8d92006-07-10 04:44:16 -0700176 sector_t curr_mark_cnt; /* blocks scheduled now */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 sector_t resync_max_sectors; /* may be set by personality */
NeilBrown9d888832005-11-08 21:39:26 -0800179
180 sector_t resync_mismatches; /* count of sectors where
181 * parity/replica mismatch found
182 */
NeilBrowne464eaf2006-03-27 01:18:14 -0800183
184 /* allow user-space to request suspension of IO to regions of the array */
185 sector_t suspend_lo;
186 sector_t suspend_hi;
NeilBrown88202a02006-01-06 00:21:36 -0800187 /* if zero, use the system-wide default */
188 int sync_speed_min;
189 int sync_speed_max;
190
Bernd Schubert90b08712008-05-23 13:04:38 -0700191 /* resync even though the same disks are shared among md-devices */
192 int parallel_resync;
193
NeilBrown6ff8d8e2006-01-06 00:20:15 -0800194 int ok_start_degraded;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 /* recovery/resync flags
196 * NEEDED: we might need to start a resync/recover
197 * RUNNING: a thread is running, or about to be started
198 * SYNC: actually doing a resync, not a recovery
Neil Brown72a23c22008-06-28 08:31:41 +1000199 * RECOVER: doing recovery, or need to try it.
NeilBrowndfc70642008-05-23 13:04:39 -0700200 * INTR: resync needs to be aborted for some reason
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 * DONE: thread is done and is waiting to be reaped
NeilBrown24dd4692005-11-08 21:39:26 -0800202 * REQUEST: user-space has requested a sync (used with SYNC)
203 * CHECK: user-space request for for check-only, no repair
NeilBrownccfcc3c2006-03-27 01:18:09 -0800204 * RESHAPE: A reshape is happening
205 *
206 * If neither SYNC or RESHAPE are set, then it is a recovery.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 */
208#define MD_RECOVERY_RUNNING 0
209#define MD_RECOVERY_SYNC 1
Neil Brown72a23c22008-06-28 08:31:41 +1000210#define MD_RECOVERY_RECOVER 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211#define MD_RECOVERY_INTR 3
212#define MD_RECOVERY_DONE 4
213#define MD_RECOVERY_NEEDED 5
NeilBrown24dd4692005-11-08 21:39:26 -0800214#define MD_RECOVERY_REQUESTED 6
215#define MD_RECOVERY_CHECK 7
NeilBrownccfcc3c2006-03-27 01:18:09 -0800216#define MD_RECOVERY_RESHAPE 8
NeilBrown5fd6c1d2006-06-26 00:27:40 -0700217#define MD_RECOVERY_FROZEN 9
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 unsigned long recovery;
NeilBrown4044ba52009-01-09 08:31:11 +1100220 int recovery_disabled; /* if we detect that recovery
221 * will always fail, set this
222 * so we don't loop trying */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 int in_sync; /* know to not need resync */
NeilBrowndf5b89b2006-03-27 01:18:20 -0800225 struct mutex reconfig_mutex;
NeilBrownf2ea68c2008-07-21 17:05:25 +1000226 atomic_t active; /* general refcount */
227 atomic_t openers; /* number of active opens */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Linus Torvalds44ce6292007-05-09 18:51:36 -0700229 int changed; /* true if we might need to reread partition info */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 int degraded; /* whether md should consider
231 * adding a spare
232 */
NeilBrowna9701a32005-11-08 21:39:34 -0800233 int barriers_work; /* initialised to true, cleared as soon
234 * as a barrier request to slave
235 * fails. Only supported
236 */
237 struct bio *biolist; /* bios that need to be retried
238 * because BIO_RW_BARRIER is not supported
239 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 atomic_t recovery_active; /* blocks scheduled, but not written */
242 wait_queue_head_t recovery_wait;
243 sector_t recovery_cp;
Neil Brown5e96ee62008-06-28 08:31:24 +1000244 sector_t resync_min; /* user requested sync
245 * starts here */
NeilBrownc6207272008-02-06 01:39:52 -0800246 sector_t resync_max; /* resync should pause
247 * when it gets here */
NeilBrown06d91a52005-06-21 17:17:12 -0700248
NeilBrownb62b7592008-10-21 13:25:21 +1100249 struct sysfs_dirent *sysfs_state; /* handle for 'array_state'
250 * file in sysfs.
251 */
NeilBrown0c3573f2009-01-09 08:31:05 +1100252 struct sysfs_dirent *sysfs_action; /* handle for 'sync_action' */
NeilBrownb62b7592008-10-21 13:25:21 +1100253
NeilBrownd3374822009-01-09 08:31:10 +1100254 struct work_struct del_work; /* used for delayed sysfs removal */
255
NeilBrown06d91a52005-06-21 17:17:12 -0700256 spinlock_t write_lock;
NeilBrown3d310eb2005-06-21 17:17:26 -0700257 wait_queue_head_t sb_wait; /* for waiting on superblock updates */
NeilBrown7bfa19f2005-06-21 17:17:28 -0700258 atomic_t pending_writes; /* number of active superblock writes */
NeilBrown06d91a52005-06-21 17:17:12 -0700259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 unsigned int safemode; /* if set, update "clean" superblock
261 * when no writes pending.
262 */
263 unsigned int safemode_delay;
264 struct timer_list safemode_timer;
265 atomic_t writes_pending;
Jens Axboe165125e2007-07-24 09:28:11 +0200266 struct request_queue *queue; /* for plugging ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
NeilBrown4b6d2872005-09-09 16:23:47 -0700268 atomic_t write_behind; /* outstanding async IO */
269 unsigned int max_write_behind; /* 0 = sync */
270
NeilBrown32a76272005-06-21 17:17:14 -0700271 struct bitmap *bitmap; /* the bitmap for the device */
272 struct file *bitmap_file; /* the bitmap file */
NeilBrowna654b9d82005-06-21 17:17:27 -0700273 long bitmap_offset; /* offset from superblock of
274 * start of bitmap. May be
275 * negative, but not '0'
276 */
NeilBrown36fa3062005-09-09 16:23:45 -0700277 long default_bitmap_offset; /* this is the offset to use when
278 * hot-adding a bitmap. It should
279 * eventually be settable by sysfs.
280 */
NeilBrown32a76272005-06-21 17:17:14 -0700281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 struct list_head all_mddevs;
283};
284
285
286static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev)
287{
NeilBrownb2d444d2005-11-08 21:39:31 -0800288 int faulty = test_bit(Faulty, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 if (atomic_dec_and_test(&rdev->nr_pending) && faulty)
290 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
291}
292
293static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors)
294{
295 atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io);
296}
297
NeilBrown2604b702006-01-06 00:20:36 -0800298struct mdk_personality
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
300 char *name;
NeilBrown2604b702006-01-06 00:20:36 -0800301 int level;
302 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 struct module *owner;
Jens Axboe165125e2007-07-24 09:28:11 +0200304 int (*make_request)(struct request_queue *q, struct bio *bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 int (*run)(mddev_t *mddev);
306 int (*stop)(mddev_t *mddev);
307 void (*status)(struct seq_file *seq, mddev_t *mddev);
308 /* error_handler must set ->faulty and clear ->in_sync
309 * if appropriate, and should abort recovery if needed
310 */
311 void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev);
312 int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev);
313 int (*hot_remove_disk) (mddev_t *mddev, int number);
314 int (*spare_active) (mddev_t *mddev);
NeilBrown57afd892005-06-21 17:17:13 -0700315 sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 int (*resize) (mddev_t *mddev, sector_t sectors);
Dan Williams80c3a6c2009-03-17 18:10:40 -0700317 sector_t (*size) (mddev_t *mddev, sector_t sectors, int raid_disks);
NeilBrown63c70c42006-03-27 01:18:13 -0800318 int (*check_reshape) (mddev_t *mddev);
319 int (*start_reshape) (mddev_t *mddev);
NeilBrowncea9c222009-03-31 15:15:05 +1100320 void (*finish_reshape) (mddev_t *mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 int (*reconfig) (mddev_t *mddev, int layout, int chunk_size);
NeilBrown36fa3062005-09-09 16:23:45 -0700322 /* quiesce moves between quiescence states
323 * 0 - fully active
324 * 1 - no new requests allowed
325 * others - reserved
326 */
327 void (*quiesce) (mddev_t *mddev, int state);
NeilBrown245f46c2009-03-31 14:39:39 +1100328 /* takeover is used to transition an array from one
329 * personality to another. The new personality must be able
330 * to handle the data in the current layout.
331 * e.g. 2drive raid1 -> 2drive raid5
332 * ndrive raid5 -> degraded n+1drive raid6 with special layout
333 * If the takeover succeeds, a new 'private' structure is returned.
334 * This needs to be installed and then ->run used to activate the
335 * array.
336 */
337 void *(*takeover) (mddev_t *mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338};
339
340
NeilBrown007583c2005-11-08 21:39:30 -0800341struct md_sysfs_entry {
342 struct attribute attr;
343 ssize_t (*show)(mddev_t *, char *);
344 ssize_t (*store)(mddev_t *, const char *, size_t);
345};
346
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348static inline char * mdname (mddev_t * mddev)
349{
350 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
351}
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353/*
354 * iterates through some rdev ringlist. It's safe to remove the
355 * current 'rdev'. Dont touch 'tmp' though.
356 */
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100357#define rdev_for_each_list(rdev, tmp, head) \
358 list_for_each_entry_safe(rdev, tmp, head, same_set)
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360/*
361 * iterates through the 'same array disks' ringlist
362 */
NeilBrownd089c6a2008-02-06 01:39:59 -0800363#define rdev_for_each(rdev, tmp, mddev) \
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100364 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
NeilBrown4b809912008-07-21 17:05:25 +1000366#define rdev_for_each_rcu(rdev, mddev) \
367 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369typedef struct mdk_thread_s {
370 void (*run) (mddev_t *mddev);
371 mddev_t *mddev;
372 wait_queue_head_t wqueue;
373 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 struct task_struct *tsk;
NeilBrown32a76272005-06-21 17:17:14 -0700375 unsigned long timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376} mdk_thread_t;
377
378#define THREAD_WAKEUP 0
379
380#define __wait_event_lock_irq(wq, condition, lock, cmd) \
381do { \
382 wait_queue_t __wait; \
383 init_waitqueue_entry(&__wait, current); \
384 \
385 add_wait_queue(&wq, &__wait); \
386 for (;;) { \
387 set_current_state(TASK_UNINTERRUPTIBLE); \
388 if (condition) \
389 break; \
390 spin_unlock_irq(&lock); \
391 cmd; \
392 schedule(); \
393 spin_lock_irq(&lock); \
394 } \
395 current->state = TASK_RUNNING; \
396 remove_wait_queue(&wq, &__wait); \
397} while (0)
398
399#define wait_event_lock_irq(wq, condition, lock, cmd) \
400do { \
401 if (condition) \
402 break; \
403 __wait_event_lock_irq(wq, condition, lock, cmd); \
404} while (0)
405
NeilBrown1345b1d2006-01-06 00:20:40 -0800406static inline void safe_put_page(struct page *p)
407{
408 if (p) put_page(p);
409}
410
David Howells93614012006-09-30 20:45:40 +0200411#endif /* CONFIG_BLOCK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412#endif
413
NeilBrown92022952009-03-31 14:33:13 +1100414
415extern int register_md_personality(struct mdk_personality *p);
416extern int unregister_md_personality(struct mdk_personality *p);
417extern mdk_thread_t * md_register_thread(void (*run) (mddev_t *mddev),
418 mddev_t *mddev, const char *name);
419extern void md_unregister_thread(mdk_thread_t *thread);
420extern void md_wakeup_thread(mdk_thread_t *thread);
421extern void md_check_recovery(mddev_t *mddev);
422extern void md_write_start(mddev_t *mddev, struct bio *bi);
423extern void md_write_end(mddev_t *mddev);
424extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
425extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev);
426
427extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
428 sector_t sector, int size, struct page *page);
429extern void md_super_wait(mddev_t *mddev);
430extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
431 struct page *page, int rw);
432extern void md_do_sync(mddev_t *mddev);
433extern void md_new_event(mddev_t *mddev);
434extern int md_allow_write(mddev_t *mddev);
435extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
Dan Williams1f403622009-03-31 14:59:03 +1100436extern void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors);