Commit | Line | Data |
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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 | 39 | struct 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 */ |
c6563a8c | 58 | sector_t new_data_offset;/* only relevant while reshaping */ |
0f420358 | 59 | sector_t sb_start; /* offset of the super block (in 512byte sectors) */ |
0002b271 | 60 | int sb_size; /* bytes in the superblock */ |
1da177e4 LT |
61 | int preferred_minor; /* autorun support */ |
62 | ||
86e6ffdd N |
63 | struct kobject kobj; |
64 | ||
1da177e4 LT |
65 | /* A device can be in one of three states based on two flags: |
66 | * Not working: faulty==1 in_sync==0 | |
67 | * Fully working: faulty==0 in_sync==1 | |
68 | * Working, but not | |
69 | * in sync with array | |
70 | * faulty==0 in_sync==0 | |
71 | * | |
72 | * It can never have faulty==1, in_sync==1 | |
73 | * This reduces the burden of testing multiple flags in many cases | |
74 | */ | |
1da177e4 | 75 | |
2d78f8c4 | 76 | unsigned long flags; /* bit set of 'enum flag_bits' bits. */ |
6bfe0b49 | 77 | wait_queue_head_t blocked_wait; |
8ddf9efe | 78 | |
1da177e4 LT |
79 | int desc_nr; /* descriptor index in the superblock */ |
80 | int raid_disk; /* role of device in array */ | |
e93f68a1 N |
81 | int new_raid_disk; /* role that the device will have in |
82 | * the array after a level-change completes. | |
83 | */ | |
41158c7e N |
84 | 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 | */ | |
5fd6c1dc N |
88 | sector_t recovery_offset;/* If this device has been partially |
89 | * recovered, this is where we were | |
90 | * up to. | |
91 | */ | |
1da177e4 LT |
92 | |
93 | atomic_t nr_pending; /* number of pending requests. | |
94 | * only maintained for arrays that | |
95 | * support hot removal | |
96 | */ | |
ba22dcbf N |
97 | atomic_t read_errors; /* number of consecutive read errors that |
98 | * we have tried to ignore. | |
99 | */ | |
1e50915f RB |
100 | struct timespec last_read_error; /* monotonic time since our |
101 | * last read error | |
102 | */ | |
4dbcdc75 N |
103 | atomic_t corrected_errors; /* number of corrected read errors, |
104 | * for reporting to userspace and storing | |
105 | * in superblock. | |
106 | */ | |
5792a285 | 107 | struct work_struct del_work; /* used for delayed sysfs removal */ |
3c0ee63a N |
108 | |
109 | struct sysfs_dirent *sysfs_state; /* handle for 'state' | |
110 | * sysfs entry */ | |
2230dfe4 N |
111 | |
112 | struct badblocks { | |
113 | int count; /* count of bad blocks */ | |
de393cde N |
114 | int unacked_exist; /* there probably are unacknowledged |
115 | * bad blocks. This is only cleared | |
116 | * when a read discovers none | |
117 | */ | |
2230dfe4 N |
118 | int shift; /* shift from sectors to block size |
119 | * a -ve shift means badblocks are | |
120 | * disabled.*/ | |
121 | u64 *page; /* badblock list */ | |
122 | int changed; | |
123 | seqlock_t lock; | |
2699b672 N |
124 | |
125 | sector_t sector; | |
126 | sector_t size; /* in sectors */ | |
2230dfe4 | 127 | } badblocks; |
1da177e4 | 128 | }; |
2d78f8c4 N |
129 | enum flag_bits { |
130 | Faulty, /* device is known to have a fault */ | |
131 | In_sync, /* device is in_sync with rest of array */ | |
050b6615 N |
132 | Unmerged, /* device is being added to array and should |
133 | * be considerred for bvec_merge_fn but not | |
134 | * yet for actual IO | |
135 | */ | |
2d78f8c4 N |
136 | WriteMostly, /* Avoid reading if at all possible */ |
137 | AutoDetected, /* added by auto-detect */ | |
138 | Blocked, /* An error occurred but has not yet | |
139 | * been acknowledged by the metadata | |
140 | * handler, so don't allow writes | |
141 | * until it is cleared */ | |
142 | WriteErrorSeen, /* A write error has been seen on this | |
143 | * device | |
144 | */ | |
145 | FaultRecorded, /* Intermediate state for clearing | |
146 | * Blocked. The Fault is/will-be | |
147 | * recorded in the metadata, but that | |
148 | * metadata hasn't been stored safely | |
149 | * on disk yet. | |
150 | */ | |
151 | BlockedBadBlocks, /* A writer is blocked because they | |
152 | * found an unacknowledged bad-block. | |
153 | * This can safely be cleared at any | |
154 | * time, and the writer will re-check. | |
155 | * It may be set at any time, and at | |
156 | * worst the writer will timeout and | |
157 | * re-check. So setting it as | |
158 | * accurately as possible is good, but | |
159 | * not absolutely critical. | |
160 | */ | |
161 | WantReplacement, /* This device is a candidate to be | |
162 | * hot-replaced, either because it has | |
163 | * reported some faults, or because | |
164 | * of explicit request. | |
165 | */ | |
166 | Replacement, /* This device is a replacement for | |
167 | * a want_replacement device with same | |
168 | * raid_disk number. | |
169 | */ | |
170 | }; | |
1da177e4 | 171 | |
2230dfe4 N |
172 | #define BB_LEN_MASK (0x00000000000001FFULL) |
173 | #define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL) | |
174 | #define BB_ACK_MASK (0x8000000000000000ULL) | |
175 | #define BB_MAX_LEN 512 | |
176 | #define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9) | |
177 | #define BB_LEN(x) (((x) & BB_LEN_MASK) + 1) | |
178 | #define BB_ACK(x) (!!((x) & BB_ACK_MASK)) | |
179 | #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63)) | |
180 | ||
181 | extern int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
182 | sector_t *first_bad, int *bad_sectors); | |
3cb03002 | 183 | static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, |
2230dfe4 N |
184 | sector_t *first_bad, int *bad_sectors) |
185 | { | |
186 | if (unlikely(rdev->badblocks.count)) { | |
187 | int rv = md_is_badblock(&rdev->badblocks, rdev->data_offset + s, | |
188 | sectors, | |
189 | first_bad, bad_sectors); | |
190 | if (rv) | |
191 | *first_bad -= rdev->data_offset; | |
192 | return rv; | |
193 | } | |
194 | return 0; | |
195 | } | |
3cb03002 | 196 | extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c N |
197 | int is_new); |
198 | extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, | |
199 | int is_new); | |
2230dfe4 N |
200 | extern void md_ack_all_badblocks(struct badblocks *bb); |
201 | ||
fd01b88c | 202 | struct mddev { |
1da177e4 | 203 | void *private; |
84fc4b56 | 204 | struct md_personality *pers; |
1da177e4 LT |
205 | dev_t unit; |
206 | int md_minor; | |
207 | struct list_head disks; | |
850b2b42 N |
208 | unsigned long flags; |
209 | #define MD_CHANGE_DEVS 0 /* Some device status has changed */ | |
210 | #define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */ | |
070dc6dd | 211 | #define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */ |
9c81075f | 212 | #define MD_ARRAY_FIRST_USE 3 /* First use of array, needs initialization */ |
850b2b42 | 213 | |
409c57f3 N |
214 | int suspended; |
215 | atomic_t active_io; | |
1da177e4 | 216 | int ro; |
bb4f1e9d N |
217 | int sysfs_active; /* set when sysfs deletes |
218 | * are happening, so run/ | |
219 | * takeover/stop are not safe | |
220 | */ | |
0ca69886 N |
221 | int ready; /* See when safe to pass |
222 | * IO requests down */ | |
1da177e4 LT |
223 | struct gendisk *gendisk; |
224 | ||
eae1701f | 225 | struct kobject kobj; |
d3374825 N |
226 | int hold_active; |
227 | #define UNTIL_IOCTL 1 | |
efeb53c0 | 228 | #define UNTIL_STOP 2 |
eae1701f | 229 | |
1da177e4 LT |
230 | /* Superblock information */ |
231 | int major_version, | |
232 | minor_version, | |
233 | patch_version; | |
234 | int persistent; | |
e691063a N |
235 | int external; /* metadata is |
236 | * managed externally */ | |
237 | char metadata_type[17]; /* externally set*/ | |
9d8f0363 | 238 | int chunk_sectors; |
1da177e4 LT |
239 | time_t ctime, utime; |
240 | int level, layout; | |
d9d166c2 | 241 | char clevel[16]; |
1da177e4 LT |
242 | int raid_disks; |
243 | int max_disks; | |
58c0fed4 AN |
244 | sector_t dev_sectors; /* used size of |
245 | * component devices */ | |
f233ea5c | 246 | sector_t array_sectors; /* exported array size */ |
b522adcd DW |
247 | int external_size; /* size managed |
248 | * externally */ | |
1da177e4 | 249 | __u64 events; |
a8707c08 N |
250 | /* If the last 'event' was simply a clean->dirty transition, and |
251 | * we didn't write it to the spares, then it is safe and simple | |
252 | * to just decrement the event count on a dirty->clean transition. | |
253 | * So we record that possibility here. | |
254 | */ | |
255 | int can_decrease_events; | |
1da177e4 LT |
256 | |
257 | char uuid[16]; | |
258 | ||
f6705578 N |
259 | /* If the array is being reshaped, we need to record the |
260 | * new shape and an indication of where we are up to. | |
261 | * This is written to the superblock. | |
262 | * If reshape_position is MaxSector, then no reshape is happening (yet). | |
263 | */ | |
264 | sector_t reshape_position; | |
664e7c41 AN |
265 | int delta_disks, new_level, new_layout; |
266 | int new_chunk_sectors; | |
2c810cdd | 267 | int reshape_backwards; |
f6705578 | 268 | |
2b8bf345 N |
269 | struct md_thread *thread; /* management thread */ |
270 | struct md_thread *sync_thread; /* doing resync or reconstruct */ | |
ff4e8d9a | 271 | sector_t curr_resync; /* last block scheduled */ |
97e4f42d N |
272 | /* As resync requests can complete out of order, we cannot easily track |
273 | * how much resync has been completed. So we occasionally pause until | |
274 | * everything completes, then set curr_resync_completed to curr_resync. | |
275 | * As such it may be well behind the real resync mark, but it is a value | |
276 | * we are certain of. | |
277 | */ | |
278 | sector_t curr_resync_completed; | |
1da177e4 LT |
279 | unsigned long resync_mark; /* a recent timestamp */ |
280 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
ff4e8d9a | 281 | sector_t curr_mark_cnt; /* blocks scheduled now */ |
1da177e4 LT |
282 | |
283 | sector_t resync_max_sectors; /* may be set by personality */ | |
9d88883e | 284 | |
7f7583d4 | 285 | atomic64_t resync_mismatches; /* count of sectors where |
9d88883e N |
286 | * parity/replica mismatch found |
287 | */ | |
e464eafd N |
288 | |
289 | /* allow user-space to request suspension of IO to regions of the array */ | |
290 | sector_t suspend_lo; | |
291 | sector_t suspend_hi; | |
88202a0c N |
292 | /* if zero, use the system-wide default */ |
293 | int sync_speed_min; | |
294 | int sync_speed_max; | |
295 | ||
90b08710 BS |
296 | /* resync even though the same disks are shared among md-devices */ |
297 | int parallel_resync; | |
298 | ||
6ff8d8ec | 299 | int ok_start_degraded; |
1da177e4 LT |
300 | /* recovery/resync flags |
301 | * NEEDED: we might need to start a resync/recover | |
302 | * RUNNING: a thread is running, or about to be started | |
303 | * SYNC: actually doing a resync, not a recovery | |
72a23c21 | 304 | * RECOVER: doing recovery, or need to try it. |
dfc70645 | 305 | * INTR: resync needs to be aborted for some reason |
1da177e4 | 306 | * DONE: thread is done and is waiting to be reaped |
24dd469d | 307 | * REQUEST: user-space has requested a sync (used with SYNC) |
411c9403 | 308 | * CHECK: user-space request for check-only, no repair |
ccfcc3c1 | 309 | * RESHAPE: A reshape is happening |
0a19caab | 310 | * ERROR: sync-action interrupted because io-error |
ccfcc3c1 N |
311 | * |
312 | * If neither SYNC or RESHAPE are set, then it is a recovery. | |
1da177e4 LT |
313 | */ |
314 | #define MD_RECOVERY_RUNNING 0 | |
315 | #define MD_RECOVERY_SYNC 1 | |
72a23c21 | 316 | #define MD_RECOVERY_RECOVER 2 |
1da177e4 LT |
317 | #define MD_RECOVERY_INTR 3 |
318 | #define MD_RECOVERY_DONE 4 | |
319 | #define MD_RECOVERY_NEEDED 5 | |
24dd469d N |
320 | #define MD_RECOVERY_REQUESTED 6 |
321 | #define MD_RECOVERY_CHECK 7 | |
ccfcc3c1 | 322 | #define MD_RECOVERY_RESHAPE 8 |
5fd6c1dc | 323 | #define MD_RECOVERY_FROZEN 9 |
0a19caab | 324 | #define MD_RECOVERY_ERROR 10 |
5fd6c1dc | 325 | |
1da177e4 | 326 | unsigned long recovery; |
5389042f N |
327 | /* If a RAID personality determines that recovery (of a particular |
328 | * device) will fail due to a read error on the source device, it | |
329 | * takes a copy of this number and does not attempt recovery again | |
330 | * until this number changes. | |
331 | */ | |
332 | int recovery_disabled; | |
1da177e4 LT |
333 | |
334 | int in_sync; /* know to not need resync */ | |
c8c00a69 N |
335 | /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so |
336 | * that we are never stopping an array while it is open. | |
337 | * 'reconfig_mutex' protects all other reconfiguration. | |
338 | * These locks are separate due to conflicting interactions | |
339 | * with bdev->bd_mutex. | |
340 | * Lock ordering is: | |
341 | * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk | |
342 | * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open | |
343 | */ | |
344 | struct mutex open_mutex; | |
df5b89b3 | 345 | struct mutex reconfig_mutex; |
f2ea68cf N |
346 | atomic_t active; /* general refcount */ |
347 | atomic_t openers; /* number of active opens */ | |
1da177e4 | 348 | |
f0b4f7e2 N |
349 | int changed; /* True if we might need to |
350 | * reread partition info */ | |
1da177e4 LT |
351 | int degraded; /* whether md should consider |
352 | * adding a spare | |
353 | */ | |
050b6615 N |
354 | int merge_check_needed; /* at least one |
355 | * member device | |
356 | * has a | |
357 | * merge_bvec_fn */ | |
1da177e4 LT |
358 | |
359 | atomic_t recovery_active; /* blocks scheduled, but not written */ | |
360 | wait_queue_head_t recovery_wait; | |
361 | sector_t recovery_cp; | |
5e96ee65 NB |
362 | sector_t resync_min; /* user requested sync |
363 | * starts here */ | |
c6207277 N |
364 | sector_t resync_max; /* resync should pause |
365 | * when it gets here */ | |
06d91a5f | 366 | |
b62b7590 N |
367 | struct sysfs_dirent *sysfs_state; /* handle for 'array_state' |
368 | * file in sysfs. | |
369 | */ | |
0c3573f1 | 370 | struct sysfs_dirent *sysfs_action; /* handle for 'sync_action' */ |
b62b7590 | 371 | |
d3374825 N |
372 | struct work_struct del_work; /* used for delayed sysfs removal */ |
373 | ||
06d91a5f | 374 | spinlock_t write_lock; |
3d310eb7 | 375 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
7bfa19f2 | 376 | atomic_t pending_writes; /* number of active superblock writes */ |
06d91a5f | 377 | |
1da177e4 LT |
378 | unsigned int safemode; /* if set, update "clean" superblock |
379 | * when no writes pending. | |
380 | */ | |
381 | unsigned int safemode_delay; | |
382 | struct timer_list safemode_timer; | |
383 | atomic_t writes_pending; | |
165125e1 | 384 | struct request_queue *queue; /* for plugging ... */ |
1da177e4 | 385 | |
32a7627c | 386 | struct bitmap *bitmap; /* the bitmap for the device */ |
c3d9714e N |
387 | struct { |
388 | struct file *file; /* the bitmap file */ | |
f6af949c | 389 | loff_t offset; /* offset from superblock of |
c3d9714e N |
390 | * start of bitmap. May be |
391 | * negative, but not '0' | |
f6af949c N |
392 | * For external metadata, offset |
393 | * from start of device. | |
c3d9714e | 394 | */ |
6409bb05 | 395 | unsigned long space; /* space available at this offset */ |
f6af949c | 396 | loff_t default_offset; /* this is the offset to use when |
c3d9714e N |
397 | * hot-adding a bitmap. It should |
398 | * eventually be settable by sysfs. | |
399 | */ | |
6409bb05 N |
400 | unsigned long default_space; /* space available at |
401 | * default offset */ | |
c3d9714e | 402 | struct mutex mutex; |
42a04b50 | 403 | unsigned long chunksize; |
ac2f40be | 404 | unsigned long daemon_sleep; /* how many jiffies between updates? */ |
42a04b50 | 405 | unsigned long max_write_behind; /* write-behind mode */ |
ece5cff0 | 406 | int external; |
c3d9714e | 407 | } bitmap_info; |
32a7627c | 408 | |
1e50915f | 409 | atomic_t max_corr_read_errors; /* max read retries */ |
1da177e4 | 410 | struct list_head all_mddevs; |
a2826aa9 | 411 | |
a64c876f | 412 | struct attribute_group *to_remove; |
252ac522 | 413 | |
a167f663 N |
414 | struct bio_set *bio_set; |
415 | ||
e9c7469b TH |
416 | /* Generic flush handling. |
417 | * The last to finish preflush schedules a worker to submit | |
418 | * the rest of the request (without the REQ_FLUSH flag). | |
a2826aa9 | 419 | */ |
e9c7469b | 420 | struct bio *flush_bio; |
a2826aa9 | 421 | atomic_t flush_pending; |
e9c7469b | 422 | struct work_struct flush_work; |
768a418d | 423 | struct work_struct event_work; /* used by dm to report failure event */ |
fd01b88c | 424 | void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); |
1da177e4 LT |
425 | }; |
426 | ||
427 | ||
fd01b88c | 428 | static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 429 | { |
b2d444d7 | 430 | int faulty = test_bit(Faulty, &rdev->flags); |
1da177e4 LT |
431 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) |
432 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
433 | } | |
434 | ||
435 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) | |
436 | { | |
437 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); | |
438 | } | |
439 | ||
84fc4b56 | 440 | struct md_personality |
1da177e4 LT |
441 | { |
442 | char *name; | |
2604b703 N |
443 | int level; |
444 | struct list_head list; | |
1da177e4 | 445 | struct module *owner; |
b4fdcb02 | 446 | void (*make_request)(struct mddev *mddev, struct bio *bio); |
fd01b88c N |
447 | int (*run)(struct mddev *mddev); |
448 | int (*stop)(struct mddev *mddev); | |
449 | void (*status)(struct seq_file *seq, struct mddev *mddev); | |
1da177e4 LT |
450 | /* error_handler must set ->faulty and clear ->in_sync |
451 | * if appropriate, and should abort recovery if needed | |
452 | */ | |
fd01b88c N |
453 | void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); |
454 | int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); | |
b8321b68 | 455 | int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); |
fd01b88c N |
456 | int (*spare_active) (struct mddev *mddev); |
457 | sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster); | |
458 | int (*resize) (struct mddev *mddev, sector_t sectors); | |
459 | sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); | |
460 | int (*check_reshape) (struct mddev *mddev); | |
461 | int (*start_reshape) (struct mddev *mddev); | |
462 | void (*finish_reshape) (struct mddev *mddev); | |
36fa3063 N |
463 | /* quiesce moves between quiescence states |
464 | * 0 - fully active | |
465 | * 1 - no new requests allowed | |
466 | * others - reserved | |
467 | */ | |
fd01b88c | 468 | void (*quiesce) (struct mddev *mddev, int state); |
245f46c2 N |
469 | /* takeover is used to transition an array from one |
470 | * personality to another. The new personality must be able | |
471 | * to handle the data in the current layout. | |
472 | * e.g. 2drive raid1 -> 2drive raid5 | |
473 | * ndrive raid5 -> degraded n+1drive raid6 with special layout | |
474 | * If the takeover succeeds, a new 'private' structure is returned. | |
475 | * This needs to be installed and then ->run used to activate the | |
476 | * array. | |
477 | */ | |
fd01b88c | 478 | void *(*takeover) (struct mddev *mddev); |
1da177e4 LT |
479 | }; |
480 | ||
481 | ||
007583c9 N |
482 | struct md_sysfs_entry { |
483 | struct attribute attr; | |
fd01b88c N |
484 | ssize_t (*show)(struct mddev *, char *); |
485 | ssize_t (*store)(struct mddev *, const char *, size_t); | |
007583c9 | 486 | }; |
43a70507 | 487 | extern struct attribute_group md_bitmap_group; |
007583c9 | 488 | |
00bcb4ac N |
489 | static inline struct sysfs_dirent *sysfs_get_dirent_safe(struct sysfs_dirent *sd, char *name) |
490 | { | |
491 | if (sd) | |
492 | return sysfs_get_dirent(sd, NULL, name); | |
493 | return sd; | |
494 | } | |
495 | static inline void sysfs_notify_dirent_safe(struct sysfs_dirent *sd) | |
496 | { | |
497 | if (sd) | |
498 | sysfs_notify_dirent(sd); | |
499 | } | |
500 | ||
fd01b88c | 501 | static inline char * mdname (struct mddev * mddev) |
1da177e4 LT |
502 | { |
503 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
504 | } | |
505 | ||
fd01b88c | 506 | static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) |
36fad858 NK |
507 | { |
508 | char nm[20]; | |
90584fc9 | 509 | if (!test_bit(Replacement, &rdev->flags) && mddev->kobj.sd) { |
2d78f8c4 N |
510 | sprintf(nm, "rd%d", rdev->raid_disk); |
511 | return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
512 | } else | |
513 | return 0; | |
36fad858 NK |
514 | } |
515 | ||
fd01b88c | 516 | static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) |
36fad858 NK |
517 | { |
518 | char nm[20]; | |
90584fc9 | 519 | if (!test_bit(Replacement, &rdev->flags) && mddev->kobj.sd) { |
2d78f8c4 N |
520 | sprintf(nm, "rd%d", rdev->raid_disk); |
521 | sysfs_remove_link(&mddev->kobj, nm); | |
522 | } | |
36fad858 NK |
523 | } |
524 | ||
1da177e4 LT |
525 | /* |
526 | * iterates through some rdev ringlist. It's safe to remove the | |
527 | * current 'rdev'. Dont touch 'tmp' though. | |
528 | */ | |
159ec1fc CR |
529 | #define rdev_for_each_list(rdev, tmp, head) \ |
530 | list_for_each_entry_safe(rdev, tmp, head, same_set) | |
531 | ||
1da177e4 LT |
532 | /* |
533 | * iterates through the 'same array disks' ringlist | |
534 | */ | |
dafb20fa N |
535 | #define rdev_for_each(rdev, mddev) \ |
536 | list_for_each_entry(rdev, &((mddev)->disks), same_set) | |
537 | ||
538 | #define rdev_for_each_safe(rdev, tmp, mddev) \ | |
159ec1fc | 539 | list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) |
1da177e4 | 540 | |
4b80991c N |
541 | #define rdev_for_each_rcu(rdev, mddev) \ |
542 | list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) | |
543 | ||
2b8bf345 | 544 | struct md_thread { |
4ed8731d | 545 | void (*run) (struct md_thread *thread); |
fd01b88c | 546 | struct mddev *mddev; |
1da177e4 LT |
547 | wait_queue_head_t wqueue; |
548 | unsigned long flags; | |
1da177e4 | 549 | struct task_struct *tsk; |
32a7627c | 550 | unsigned long timeout; |
4ed8731d | 551 | void *private; |
2b8bf345 | 552 | }; |
1da177e4 LT |
553 | |
554 | #define THREAD_WAKEUP 0 | |
555 | ||
1345b1d8 N |
556 | static inline void safe_put_page(struct page *p) |
557 | { | |
558 | if (p) put_page(p); | |
559 | } | |
560 | ||
84fc4b56 N |
561 | extern int register_md_personality(struct md_personality *p); |
562 | extern int unregister_md_personality(struct md_personality *p); | |
2b8bf345 | 563 | extern struct md_thread *md_register_thread( |
4ed8731d | 564 | void (*run)(struct md_thread *thread), |
2b8bf345 N |
565 | struct mddev *mddev, |
566 | const char *name); | |
567 | extern void md_unregister_thread(struct md_thread **threadp); | |
568 | extern void md_wakeup_thread(struct md_thread *thread); | |
fd01b88c N |
569 | extern void md_check_recovery(struct mddev *mddev); |
570 | extern void md_write_start(struct mddev *mddev, struct bio *bi); | |
571 | extern void md_write_end(struct mddev *mddev); | |
572 | extern void md_done_sync(struct mddev *mddev, int blocks, int ok); | |
573 | extern void md_error(struct mddev *mddev, struct md_rdev *rdev); | |
c6563a8c | 574 | extern void md_finish_reshape(struct mddev *mddev); |
fd01b88c N |
575 | |
576 | extern int mddev_congested(struct mddev *mddev, int bits); | |
577 | extern void md_flush_request(struct mddev *mddev, struct bio *bio); | |
578 | extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, | |
92022950 | 579 | sector_t sector, int size, struct page *page); |
fd01b88c | 580 | extern void md_super_wait(struct mddev *mddev); |
3cb03002 | 581 | extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 582 | struct page *page, int rw, bool metadata_op); |
4ed8731d | 583 | extern void md_do_sync(struct md_thread *thread); |
fd01b88c N |
584 | extern void md_new_event(struct mddev *mddev); |
585 | extern int md_allow_write(struct mddev *mddev); | |
586 | extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); | |
587 | extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); | |
588 | extern int md_check_no_bitmap(struct mddev *mddev); | |
589 | extern int md_integrity_register(struct mddev *mddev); | |
590 | extern void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); | |
72e02075 | 591 | extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); |
43a70507 | 592 | extern void restore_bitmap_write_access(struct file *file); |
63fe0817 | 593 | |
fd01b88c N |
594 | extern void mddev_init(struct mddev *mddev); |
595 | extern int md_run(struct mddev *mddev); | |
596 | extern void md_stop(struct mddev *mddev); | |
597 | extern void md_stop_writes(struct mddev *mddev); | |
3cb03002 | 598 | extern int md_rdev_init(struct md_rdev *rdev); |
545c8795 | 599 | extern void md_rdev_clear(struct md_rdev *rdev); |
63fe0817 | 600 | |
fd01b88c N |
601 | extern void mddev_suspend(struct mddev *mddev); |
602 | extern void mddev_resume(struct mddev *mddev); | |
a167f663 | 603 | extern struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, |
fd01b88c | 604 | struct mddev *mddev); |
a167f663 | 605 | extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 606 | struct mddev *mddev); |
d2eb35ac | 607 | extern void md_trim_bio(struct bio *bio, int offset, int size); |
9cbb1750 | 608 | |
74018dc3 | 609 | extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule); |
9cbb1750 N |
610 | static inline int mddev_check_plugged(struct mddev *mddev) |
611 | { | |
612 | return !!blk_check_plugged(md_unplug, mddev, | |
613 | sizeof(struct blk_plug_cb)); | |
614 | } | |
63fe0817 | 615 | #endif /* _MD_MD_H */ |