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af1a8899 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 | 2 | /* |
7e841526 | 3 | md.h : kernel internal structure of the Linux MD driver |
1da177e4 | 4 | Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman |
f72ffdd6 | 5 | |
1da177e4 LT |
6 | */ |
7 | ||
63fe0817 CH |
8 | #ifndef _MD_MD_H |
9 | #define _MD_MD_H | |
10 | ||
11 | #include <linux/blkdev.h> | |
66114cad | 12 | #include <linux/backing-dev.h> |
fc974ee2 | 13 | #include <linux/badblocks.h> |
63fe0817 CH |
14 | #include <linux/kobject.h> |
15 | #include <linux/list.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/mutex.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/workqueue.h> | |
edb39c9d | 21 | #include "md-cluster.h" |
9361401e | 22 | |
1da177e4 | 23 | #define MaxSector (~(sector_t)0) |
1da177e4 | 24 | |
46533ff7 N |
25 | /* |
26 | * These flags should really be called "NO_RETRY" rather than | |
27 | * "FAILFAST" because they don't make any promise about time lapse, | |
28 | * only about the number of retries, which will be zero. | |
29 | * REQ_FAILFAST_DRIVER is not included because | |
30 | * Commit: 4a27446f3e39 ("[SCSI] modify scsi to handle new fail fast flags.") | |
31 | * seems to suggest that the errors it avoids retrying should usually | |
32 | * be retried. | |
33 | */ | |
34 | #define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT) | |
1da177e4 LT |
35 | /* |
36 | * MD's 'extended' device | |
37 | */ | |
3cb03002 | 38 | struct md_rdev { |
1da177e4 LT |
39 | struct list_head same_set; /* RAID devices within the same set */ |
40 | ||
dd8ac336 | 41 | sector_t sectors; /* Device size (in 512bytes sectors) */ |
fd01b88c | 42 | struct mddev *mddev; /* RAID array if running */ |
eea1bf38 | 43 | int last_events; /* IO event timestamp */ |
1da177e4 | 44 | |
a6ff7e08 JB |
45 | /* |
46 | * If meta_bdev is non-NULL, it means that a separate device is | |
47 | * being used to store the metadata (superblock/bitmap) which | |
48 | * would otherwise be contained on the same device as the data (bdev). | |
49 | */ | |
50 | struct block_device *meta_bdev; | |
1da177e4 LT |
51 | struct block_device *bdev; /* block device handle */ |
52 | ||
2699b672 | 53 | struct page *sb_page, *bb_page; |
1da177e4 | 54 | int sb_loaded; |
42543769 | 55 | __u64 sb_events; |
1da177e4 | 56 | sector_t data_offset; /* start of data in array */ |
c6563a8c | 57 | sector_t new_data_offset;/* only relevant while reshaping */ |
f72ffdd6 | 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 | |
2d78f8c4 | 75 | unsigned long flags; /* bit set of 'enum flag_bits' bits. */ |
6bfe0b49 | 76 | wait_queue_head_t blocked_wait; |
8ddf9efe | 77 | |
1da177e4 LT |
78 | int desc_nr; /* descriptor index in the superblock */ |
79 | int raid_disk; /* role of device in array */ | |
e93f68a1 N |
80 | int new_raid_disk; /* role that the device will have in |
81 | * the array after a level-change completes. | |
82 | */ | |
41158c7e N |
83 | int saved_raid_disk; /* role that device used to have in the |
84 | * array and could again if we did a partial | |
85 | * resync from the bitmap | |
86 | */ | |
3069aa8d SL |
87 | union { |
88 | sector_t recovery_offset;/* If this device has been partially | |
5fd6c1dc N |
89 | * recovered, this is where we were |
90 | * up to. | |
91 | */ | |
3069aa8d SL |
92 | sector_t journal_tail; /* If this device is a journal device, |
93 | * this is the journal tail (journal | |
94 | * recovery start point) | |
95 | */ | |
96 | }; | |
1da177e4 LT |
97 | |
98 | atomic_t nr_pending; /* number of pending requests. | |
99 | * only maintained for arrays that | |
100 | * support hot removal | |
101 | */ | |
ba22dcbf N |
102 | atomic_t read_errors; /* number of consecutive read errors that |
103 | * we have tried to ignore. | |
104 | */ | |
0e3ef49e | 105 | time64_t last_read_error; /* monotonic time since our |
1e50915f RB |
106 | * last read error |
107 | */ | |
4dbcdc75 N |
108 | atomic_t corrected_errors; /* number of corrected read errors, |
109 | * for reporting to userspace and storing | |
110 | * in superblock. | |
111 | */ | |
3e148a32 GJ |
112 | |
113 | /* | |
114 | * The members for check collision of write behind IOs. | |
115 | */ | |
116 | struct list_head wb_list; | |
117 | spinlock_t wb_list_lock; | |
118 | wait_queue_head_t wb_io_wait; | |
119 | ||
5792a285 | 120 | struct work_struct del_work; /* used for delayed sysfs removal */ |
3c0ee63a | 121 | |
324a56e1 | 122 | struct kernfs_node *sysfs_state; /* handle for 'state' |
3c0ee63a | 123 | * sysfs entry */ |
2230dfe4 | 124 | |
fc974ee2 | 125 | struct badblocks badblocks; |
ea0213e0 AP |
126 | |
127 | struct { | |
128 | short offset; /* Offset from superblock to start of PPL. | |
129 | * Not used by external metadata. */ | |
130 | unsigned int size; /* Size in sectors of the PPL space */ | |
131 | sector_t sector; /* First sector of the PPL space */ | |
132 | } ppl; | |
1da177e4 | 133 | }; |
2d78f8c4 N |
134 | enum flag_bits { |
135 | Faulty, /* device is known to have a fault */ | |
136 | In_sync, /* device is in_sync with rest of array */ | |
8313b8e5 | 137 | Bitmap_sync, /* ..actually, not quite In_sync. Need a |
4aaf7694 GJ |
138 | * bitmap-based recovery to get fully in sync. |
139 | * The bit is only meaningful before device | |
140 | * has been passed to pers->hot_add_disk. | |
8313b8e5 | 141 | */ |
2d78f8c4 N |
142 | WriteMostly, /* Avoid reading if at all possible */ |
143 | AutoDetected, /* added by auto-detect */ | |
144 | Blocked, /* An error occurred but has not yet | |
145 | * been acknowledged by the metadata | |
146 | * handler, so don't allow writes | |
147 | * until it is cleared */ | |
148 | WriteErrorSeen, /* A write error has been seen on this | |
149 | * device | |
150 | */ | |
151 | FaultRecorded, /* Intermediate state for clearing | |
152 | * Blocked. The Fault is/will-be | |
153 | * recorded in the metadata, but that | |
154 | * metadata hasn't been stored safely | |
155 | * on disk yet. | |
156 | */ | |
157 | BlockedBadBlocks, /* A writer is blocked because they | |
158 | * found an unacknowledged bad-block. | |
159 | * This can safely be cleared at any | |
160 | * time, and the writer will re-check. | |
161 | * It may be set at any time, and at | |
162 | * worst the writer will timeout and | |
163 | * re-check. So setting it as | |
164 | * accurately as possible is good, but | |
165 | * not absolutely critical. | |
166 | */ | |
167 | WantReplacement, /* This device is a candidate to be | |
168 | * hot-replaced, either because it has | |
169 | * reported some faults, or because | |
170 | * of explicit request. | |
171 | */ | |
172 | Replacement, /* This device is a replacement for | |
173 | * a want_replacement device with same | |
174 | * raid_disk number. | |
175 | */ | |
1aee41f6 GR |
176 | Candidate, /* For clustered environments only: |
177 | * This device is seen locally but not | |
178 | * by the whole cluster | |
179 | */ | |
bac624f3 SL |
180 | Journal, /* This device is used as journal for |
181 | * raid-5/6. | |
182 | * Usually, this device should be faster | |
183 | * than other devices in the array | |
184 | */ | |
659b254f | 185 | ClusterRemove, |
d787be40 N |
186 | RemoveSynchronized, /* synchronize_rcu() was called after |
187 | * this device was known to be faulty, | |
188 | * so it is safe to remove without | |
189 | * another synchronize_rcu() call. | |
190 | */ | |
35b785f7 TM |
191 | ExternalBbl, /* External metadata provides bad |
192 | * block management for a disk | |
193 | */ | |
688834e6 N |
194 | FailFast, /* Minimal retries should be attempted on |
195 | * this device, so use REQ_FAILFAST_DEV. | |
196 | * Also don't try to repair failed reads. | |
197 | * It is expects that no bad block log | |
198 | * is present. | |
199 | */ | |
46533ff7 N |
200 | LastDev, /* Seems to be the last working dev as |
201 | * it didn't fail, so don't use FailFast | |
202 | * any more for metadata | |
203 | */ | |
3e148a32 GJ |
204 | WBCollisionCheck, /* |
205 | * multiqueue device should check if there | |
206 | * is collision between write behind bios. | |
207 | */ | |
2d78f8c4 | 208 | }; |
1da177e4 | 209 | |
3cb03002 | 210 | static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, |
2230dfe4 N |
211 | sector_t *first_bad, int *bad_sectors) |
212 | { | |
213 | if (unlikely(rdev->badblocks.count)) { | |
fc974ee2 | 214 | int rv = badblocks_check(&rdev->badblocks, rdev->data_offset + s, |
2230dfe4 N |
215 | sectors, |
216 | first_bad, bad_sectors); | |
217 | if (rv) | |
218 | *first_bad -= rdev->data_offset; | |
219 | return rv; | |
220 | } | |
221 | return 0; | |
222 | } | |
3cb03002 | 223 | extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c N |
224 | int is_new); |
225 | extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, | |
226 | int is_new); | |
c4ce867f GR |
227 | struct md_cluster_info; |
228 | ||
394ed8e4 | 229 | /* change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added */ |
be306c29 | 230 | enum mddev_flags { |
be306c29 N |
231 | MD_ARRAY_FIRST_USE, /* First use of array, needs initialization */ |
232 | MD_CLOSING, /* If set, we are closing the array, do not open | |
233 | * it then */ | |
234 | MD_JOURNAL_CLEAN, /* A raid with journal is already clean */ | |
235 | MD_HAS_JOURNAL, /* The raid array has journal feature set */ | |
be306c29 N |
236 | MD_CLUSTER_RESYNC_LOCKED, /* cluster raid only, which means node |
237 | * already took resync lock, need to | |
238 | * release the lock */ | |
46533ff7 N |
239 | MD_FAILFAST_SUPPORTED, /* Using MD_FAILFAST on metadata writes is |
240 | * supported as calls to md_error() will | |
241 | * never cause the array to become failed. | |
242 | */ | |
ea0213e0 | 243 | MD_HAS_PPL, /* The raid array has PPL feature set */ |
ddc08823 | 244 | MD_HAS_MULTIPLE_PPLS, /* The raid array has multiple PPLs feature set */ |
35bfc521 N |
245 | MD_ALLOW_SB_UPDATE, /* md_check_recovery is allowed to update |
246 | * the metadata without taking reconfig_mutex. | |
247 | */ | |
248 | MD_UPDATING_SB, /* md_check_recovery is updating the metadata | |
249 | * without explicitly holding reconfig_mutex. | |
250 | */ | |
e406b460 N |
251 | MD_NOT_READY, /* do_md_run() is active, so 'array_state' |
252 | * must not report that array is ready yet | |
253 | */ | |
3163c3e7 GP |
254 | MD_BROKEN, /* This is used in RAID-0/LINEAR only, to stop |
255 | * I/O in case an array member is gone/failed. | |
256 | */ | |
be306c29 | 257 | }; |
2953079c SL |
258 | |
259 | enum mddev_sb_flags { | |
260 | MD_SB_CHANGE_DEVS, /* Some device status has changed */ | |
261 | MD_SB_CHANGE_CLEAN, /* transition to or from 'clean' */ | |
262 | MD_SB_CHANGE_PENDING, /* switch from 'clean' to 'active' in progress */ | |
263 | MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ | |
264 | }; | |
265 | ||
3e148a32 GJ |
266 | #define NR_WB_INFOS 8 |
267 | /* record current range of write behind IOs */ | |
268 | struct wb_info { | |
269 | sector_t lo; | |
270 | sector_t hi; | |
271 | struct list_head list; | |
272 | }; | |
273 | ||
fd01b88c | 274 | struct mddev { |
1da177e4 | 275 | void *private; |
84fc4b56 | 276 | struct md_personality *pers; |
1da177e4 LT |
277 | dev_t unit; |
278 | int md_minor; | |
7a0a5355 | 279 | struct list_head disks; |
850b2b42 | 280 | unsigned long flags; |
2953079c | 281 | unsigned long sb_flags; |
850b2b42 | 282 | |
409c57f3 N |
283 | int suspended; |
284 | atomic_t active_io; | |
1da177e4 | 285 | int ro; |
bb4f1e9d N |
286 | int sysfs_active; /* set when sysfs deletes |
287 | * are happening, so run/ | |
288 | * takeover/stop are not safe | |
289 | */ | |
1da177e4 LT |
290 | struct gendisk *gendisk; |
291 | ||
eae1701f | 292 | struct kobject kobj; |
d3374825 N |
293 | int hold_active; |
294 | #define UNTIL_IOCTL 1 | |
efeb53c0 | 295 | #define UNTIL_STOP 2 |
eae1701f | 296 | |
1da177e4 LT |
297 | /* Superblock information */ |
298 | int major_version, | |
299 | minor_version, | |
300 | patch_version; | |
301 | int persistent; | |
f72ffdd6 | 302 | int external; /* metadata is |
e691063a N |
303 | * managed externally */ |
304 | char metadata_type[17]; /* externally set*/ | |
9d8f0363 | 305 | int chunk_sectors; |
9ebc6ef1 | 306 | time64_t ctime, utime; |
1da177e4 | 307 | int level, layout; |
d9d166c2 | 308 | char clevel[16]; |
1da177e4 LT |
309 | int raid_disks; |
310 | int max_disks; | |
f72ffdd6 | 311 | sector_t dev_sectors; /* used size of |
58c0fed4 | 312 | * component devices */ |
f233ea5c | 313 | sector_t array_sectors; /* exported array size */ |
b522adcd DW |
314 | int external_size; /* size managed |
315 | * externally */ | |
1da177e4 | 316 | __u64 events; |
a8707c08 N |
317 | /* If the last 'event' was simply a clean->dirty transition, and |
318 | * we didn't write it to the spares, then it is safe and simple | |
319 | * to just decrement the event count on a dirty->clean transition. | |
320 | * So we record that possibility here. | |
321 | */ | |
322 | int can_decrease_events; | |
1da177e4 LT |
323 | |
324 | char uuid[16]; | |
325 | ||
f6705578 N |
326 | /* If the array is being reshaped, we need to record the |
327 | * new shape and an indication of where we are up to. | |
328 | * This is written to the superblock. | |
329 | * If reshape_position is MaxSector, then no reshape is happening (yet). | |
330 | */ | |
331 | sector_t reshape_position; | |
664e7c41 AN |
332 | int delta_disks, new_level, new_layout; |
333 | int new_chunk_sectors; | |
2c810cdd | 334 | int reshape_backwards; |
f6705578 | 335 | |
2b8bf345 N |
336 | struct md_thread *thread; /* management thread */ |
337 | struct md_thread *sync_thread; /* doing resync or reconstruct */ | |
c4a39551 JB |
338 | |
339 | /* 'last_sync_action' is initialized to "none". It is set when a | |
340 | * sync operation (i.e "data-check", "requested-resync", "resync", | |
341 | * "recovery", or "reshape") is started. It holds this value even | |
342 | * when the sync thread is "frozen" (interrupted) or "idle" (stopped | |
343 | * or finished). It is overwritten when a new sync operation is begun. | |
344 | */ | |
345 | char *last_sync_action; | |
ff4e8d9a | 346 | sector_t curr_resync; /* last block scheduled */ |
97e4f42d N |
347 | /* As resync requests can complete out of order, we cannot easily track |
348 | * how much resync has been completed. So we occasionally pause until | |
349 | * everything completes, then set curr_resync_completed to curr_resync. | |
350 | * As such it may be well behind the real resync mark, but it is a value | |
351 | * we are certain of. | |
352 | */ | |
353 | sector_t curr_resync_completed; | |
1da177e4 LT |
354 | unsigned long resync_mark; /* a recent timestamp */ |
355 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
ff4e8d9a | 356 | sector_t curr_mark_cnt; /* blocks scheduled now */ |
1da177e4 LT |
357 | |
358 | sector_t resync_max_sectors; /* may be set by personality */ | |
9d88883e | 359 | |
7f7583d4 | 360 | atomic64_t resync_mismatches; /* count of sectors where |
9d88883e N |
361 | * parity/replica mismatch found |
362 | */ | |
e464eafd N |
363 | |
364 | /* allow user-space to request suspension of IO to regions of the array */ | |
365 | sector_t suspend_lo; | |
366 | sector_t suspend_hi; | |
88202a0c N |
367 | /* if zero, use the system-wide default */ |
368 | int sync_speed_min; | |
369 | int sync_speed_max; | |
370 | ||
90b08710 BS |
371 | /* resync even though the same disks are shared among md-devices */ |
372 | int parallel_resync; | |
373 | ||
6ff8d8ec | 374 | int ok_start_degraded; |
5fd6c1dc | 375 | |
1da177e4 | 376 | unsigned long recovery; |
5389042f N |
377 | /* If a RAID personality determines that recovery (of a particular |
378 | * device) will fail due to a read error on the source device, it | |
379 | * takes a copy of this number and does not attempt recovery again | |
380 | * until this number changes. | |
381 | */ | |
382 | int recovery_disabled; | |
1da177e4 LT |
383 | |
384 | int in_sync; /* know to not need resync */ | |
c8c00a69 N |
385 | /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so |
386 | * that we are never stopping an array while it is open. | |
387 | * 'reconfig_mutex' protects all other reconfiguration. | |
388 | * These locks are separate due to conflicting interactions | |
389 | * with bdev->bd_mutex. | |
390 | * Lock ordering is: | |
391 | * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk | |
392 | * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open | |
393 | */ | |
394 | struct mutex open_mutex; | |
df5b89b3 | 395 | struct mutex reconfig_mutex; |
f2ea68cf N |
396 | atomic_t active; /* general refcount */ |
397 | atomic_t openers; /* number of active opens */ | |
1da177e4 | 398 | |
f0b4f7e2 N |
399 | int changed; /* True if we might need to |
400 | * reread partition info */ | |
1da177e4 LT |
401 | int degraded; /* whether md should consider |
402 | * adding a spare | |
403 | */ | |
404 | ||
405 | atomic_t recovery_active; /* blocks scheduled, but not written */ | |
406 | wait_queue_head_t recovery_wait; | |
407 | sector_t recovery_cp; | |
5e96ee65 NB |
408 | sector_t resync_min; /* user requested sync |
409 | * starts here */ | |
c6207277 N |
410 | sector_t resync_max; /* resync should pause |
411 | * when it gets here */ | |
06d91a5f | 412 | |
324a56e1 | 413 | struct kernfs_node *sysfs_state; /* handle for 'array_state' |
b62b7590 N |
414 | * file in sysfs. |
415 | */ | |
324a56e1 | 416 | struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ |
b62b7590 | 417 | |
d3374825 N |
418 | struct work_struct del_work; /* used for delayed sysfs removal */ |
419 | ||
85572d7c N |
420 | /* "lock" protects: |
421 | * flush_bio transition from NULL to !NULL | |
422 | * rdev superblocks, events | |
423 | * clearing MD_CHANGE_* | |
424 | * in_sync - and related safemode and MD_CHANGE changes | |
36d091f4 | 425 | * pers (also protected by reconfig_mutex and pending IO). |
978a7a47 | 426 | * clearing ->bitmap |
4af1a041 | 427 | * clearing ->bitmap_info.file |
23da422b N |
428 | * changing ->resync_{min,max} |
429 | * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) | |
85572d7c N |
430 | */ |
431 | spinlock_t lock; | |
3d310eb7 | 432 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
7bfa19f2 | 433 | atomic_t pending_writes; /* number of active superblock writes */ |
06d91a5f | 434 | |
1da177e4 LT |
435 | unsigned int safemode; /* if set, update "clean" superblock |
436 | * when no writes pending. | |
f72ffdd6 | 437 | */ |
1da177e4 LT |
438 | unsigned int safemode_delay; |
439 | struct timer_list safemode_timer; | |
4ad23a97 N |
440 | struct percpu_ref writes_pending; |
441 | int sync_checkers; /* # of threads checking writes_pending */ | |
165125e1 | 442 | struct request_queue *queue; /* for plugging ... */ |
1da177e4 | 443 | |
f72ffdd6 | 444 | struct bitmap *bitmap; /* the bitmap for the device */ |
c3d9714e N |
445 | struct { |
446 | struct file *file; /* the bitmap file */ | |
f6af949c | 447 | loff_t offset; /* offset from superblock of |
c3d9714e N |
448 | * start of bitmap. May be |
449 | * negative, but not '0' | |
f6af949c | 450 | * For external metadata, offset |
f72ffdd6 | 451 | * from start of device. |
c3d9714e | 452 | */ |
6409bb05 | 453 | unsigned long space; /* space available at this offset */ |
f6af949c | 454 | loff_t default_offset; /* this is the offset to use when |
c3d9714e N |
455 | * hot-adding a bitmap. It should |
456 | * eventually be settable by sysfs. | |
457 | */ | |
6409bb05 N |
458 | unsigned long default_space; /* space available at |
459 | * default offset */ | |
c3d9714e | 460 | struct mutex mutex; |
42a04b50 | 461 | unsigned long chunksize; |
ac2f40be | 462 | unsigned long daemon_sleep; /* how many jiffies between updates? */ |
42a04b50 | 463 | unsigned long max_write_behind; /* write-behind mode */ |
ece5cff0 | 464 | int external; |
c4ce867f | 465 | int nodes; /* Maximum number of nodes in the cluster */ |
cf921cc1 | 466 | char cluster_name[64]; /* Name of the cluster */ |
c3d9714e | 467 | } bitmap_info; |
32a7627c | 468 | |
f72ffdd6 | 469 | atomic_t max_corr_read_errors; /* max read retries */ |
1da177e4 | 470 | struct list_head all_mddevs; |
a2826aa9 | 471 | |
a64c876f | 472 | struct attribute_group *to_remove; |
252ac522 | 473 | |
afeee514 KO |
474 | struct bio_set bio_set; |
475 | struct bio_set sync_set; /* for sync operations like | |
5a85071c N |
476 | * metadata and bitmap writes |
477 | */ | |
a167f663 | 478 | |
4bc034d3 N |
479 | /* Generic flush handling. |
480 | * The last to finish preflush schedules a worker to submit | |
481 | * the rest of the request (without the REQ_PREFLUSH flag). | |
482 | */ | |
483 | struct bio *flush_bio; | |
484 | atomic_t flush_pending; | |
2bc13b83 N |
485 | ktime_t start_flush, last_flush; /* last_flush is when the last completed |
486 | * flush was started. | |
487 | */ | |
4bc034d3 | 488 | struct work_struct flush_work; |
768a418d | 489 | struct work_struct event_work; /* used by dm to report failure event */ |
3e148a32 | 490 | mempool_t *wb_info_pool; |
fd01b88c | 491 | void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); |
c4ce867f | 492 | struct md_cluster_info *cluster_info; |
15858fa5 | 493 | unsigned int good_device_nr; /* good device num within cluster raid */ |
4b6c1060 HM |
494 | |
495 | bool has_superblocks:1; | |
be306c29 N |
496 | }; |
497 | ||
498 | enum recovery_flags { | |
499 | /* | |
500 | * If neither SYNC or RESHAPE are set, then it is a recovery. | |
501 | */ | |
502 | MD_RECOVERY_RUNNING, /* a thread is running, or about to be started */ | |
503 | MD_RECOVERY_SYNC, /* actually doing a resync, not a recovery */ | |
504 | MD_RECOVERY_RECOVER, /* doing recovery, or need to try it. */ | |
505 | MD_RECOVERY_INTR, /* resync needs to be aborted for some reason */ | |
506 | MD_RECOVERY_DONE, /* thread is done and is waiting to be reaped */ | |
507 | MD_RECOVERY_NEEDED, /* we might need to start a resync/recover */ | |
508 | MD_RECOVERY_REQUESTED, /* user-space has requested a sync (used with SYNC) */ | |
509 | MD_RECOVERY_CHECK, /* user-space request for check-only, no repair */ | |
510 | MD_RECOVERY_RESHAPE, /* A reshape is happening */ | |
511 | MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */ | |
512 | MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */ | |
d5d885fd | 513 | MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */ |
0357ba27 | 514 | MD_RESYNCING_REMOTE, /* remote node is running resync thread */ |
1da177e4 LT |
515 | }; |
516 | ||
5c47daf6 N |
517 | static inline int __must_check mddev_lock(struct mddev *mddev) |
518 | { | |
519 | return mutex_lock_interruptible(&mddev->reconfig_mutex); | |
520 | } | |
521 | ||
522 | /* Sometimes we need to take the lock in a situation where | |
523 | * failure due to interrupts is not acceptable. | |
524 | */ | |
525 | static inline void mddev_lock_nointr(struct mddev *mddev) | |
526 | { | |
527 | mutex_lock(&mddev->reconfig_mutex); | |
528 | } | |
529 | ||
5c47daf6 N |
530 | static inline int mddev_trylock(struct mddev *mddev) |
531 | { | |
532 | return mutex_trylock(&mddev->reconfig_mutex); | |
533 | } | |
534 | extern void mddev_unlock(struct mddev *mddev); | |
535 | ||
1da177e4 LT |
536 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) |
537 | { | |
f72ffdd6 | 538 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); |
1da177e4 LT |
539 | } |
540 | ||
74d46992 CH |
541 | static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) |
542 | { | |
543 | atomic_add(nr_sectors, &bio->bi_disk->sync_io); | |
544 | } | |
545 | ||
84fc4b56 | 546 | struct md_personality |
1da177e4 LT |
547 | { |
548 | char *name; | |
2604b703 N |
549 | int level; |
550 | struct list_head list; | |
1da177e4 | 551 | struct module *owner; |
cc27b0c7 | 552 | bool (*make_request)(struct mddev *mddev, struct bio *bio); |
d5d885fd SL |
553 | /* |
554 | * start up works that do NOT require md_thread. tasks that | |
555 | * requires md_thread should go into start() | |
556 | */ | |
fd01b88c | 557 | int (*run)(struct mddev *mddev); |
d5d885fd SL |
558 | /* start up works that require md threads */ |
559 | int (*start)(struct mddev *mddev); | |
afa0f557 | 560 | void (*free)(struct mddev *mddev, void *priv); |
fd01b88c | 561 | void (*status)(struct seq_file *seq, struct mddev *mddev); |
1da177e4 | 562 | /* error_handler must set ->faulty and clear ->in_sync |
f72ffdd6 | 563 | * if appropriate, and should abort recovery if needed |
1da177e4 | 564 | */ |
fd01b88c N |
565 | void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); |
566 | int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); | |
b8321b68 | 567 | int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); |
fd01b88c | 568 | int (*spare_active) (struct mddev *mddev); |
09314799 | 569 | sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); |
fd01b88c N |
570 | int (*resize) (struct mddev *mddev, sector_t sectors); |
571 | sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); | |
572 | int (*check_reshape) (struct mddev *mddev); | |
573 | int (*start_reshape) (struct mddev *mddev); | |
574 | void (*finish_reshape) (struct mddev *mddev); | |
7564beda | 575 | void (*update_reshape_pos) (struct mddev *mddev); |
b03e0ccb N |
576 | /* quiesce suspends or resumes internal processing. |
577 | * 1 - stop new actions and wait for action io to complete | |
578 | * 0 - return to normal behaviour | |
36fa3063 | 579 | */ |
b03e0ccb | 580 | void (*quiesce) (struct mddev *mddev, int quiesce); |
245f46c2 N |
581 | /* takeover is used to transition an array from one |
582 | * personality to another. The new personality must be able | |
583 | * to handle the data in the current layout. | |
584 | * e.g. 2drive raid1 -> 2drive raid5 | |
585 | * ndrive raid5 -> degraded n+1drive raid6 with special layout | |
586 | * If the takeover succeeds, a new 'private' structure is returned. | |
587 | * This needs to be installed and then ->run used to activate the | |
588 | * array. | |
589 | */ | |
fd01b88c | 590 | void *(*takeover) (struct mddev *mddev); |
5c675f83 N |
591 | /* congested implements bdi.congested_fn(). |
592 | * Will not be called while array is 'suspended' */ | |
593 | int (*congested)(struct mddev *mddev, int bits); | |
ba903a3e AP |
594 | /* Changes the consistency policy of an active array. */ |
595 | int (*change_consistency_policy)(struct mddev *mddev, const char *buf); | |
1da177e4 LT |
596 | }; |
597 | ||
007583c9 N |
598 | struct md_sysfs_entry { |
599 | struct attribute attr; | |
fd01b88c N |
600 | ssize_t (*show)(struct mddev *, char *); |
601 | ssize_t (*store)(struct mddev *, const char *, size_t); | |
007583c9 | 602 | }; |
43a70507 | 603 | extern struct attribute_group md_bitmap_group; |
007583c9 | 604 | |
324a56e1 | 605 | static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) |
00bcb4ac N |
606 | { |
607 | if (sd) | |
388975cc | 608 | return sysfs_get_dirent(sd, name); |
00bcb4ac N |
609 | return sd; |
610 | } | |
324a56e1 | 611 | static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) |
00bcb4ac N |
612 | { |
613 | if (sd) | |
614 | sysfs_notify_dirent(sd); | |
615 | } | |
616 | ||
fd01b88c | 617 | static inline char * mdname (struct mddev * mddev) |
1da177e4 LT |
618 | { |
619 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
620 | } | |
621 | ||
fd01b88c | 622 | static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) |
36fad858 NK |
623 | { |
624 | char nm[20]; | |
9b15603d SL |
625 | if (!test_bit(Replacement, &rdev->flags) && |
626 | !test_bit(Journal, &rdev->flags) && | |
627 | mddev->kobj.sd) { | |
2d78f8c4 N |
628 | sprintf(nm, "rd%d", rdev->raid_disk); |
629 | return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
630 | } else | |
631 | return 0; | |
36fad858 NK |
632 | } |
633 | ||
fd01b88c | 634 | static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) |
36fad858 NK |
635 | { |
636 | char nm[20]; | |
9b15603d SL |
637 | if (!test_bit(Replacement, &rdev->flags) && |
638 | !test_bit(Journal, &rdev->flags) && | |
639 | mddev->kobj.sd) { | |
2d78f8c4 N |
640 | sprintf(nm, "rd%d", rdev->raid_disk); |
641 | sysfs_remove_link(&mddev->kobj, nm); | |
642 | } | |
36fad858 NK |
643 | } |
644 | ||
1da177e4 LT |
645 | /* |
646 | * iterates through some rdev ringlist. It's safe to remove the | |
647 | * current 'rdev'. Dont touch 'tmp' though. | |
648 | */ | |
159ec1fc CR |
649 | #define rdev_for_each_list(rdev, tmp, head) \ |
650 | list_for_each_entry_safe(rdev, tmp, head, same_set) | |
651 | ||
1da177e4 LT |
652 | /* |
653 | * iterates through the 'same array disks' ringlist | |
654 | */ | |
dafb20fa N |
655 | #define rdev_for_each(rdev, mddev) \ |
656 | list_for_each_entry(rdev, &((mddev)->disks), same_set) | |
657 | ||
658 | #define rdev_for_each_safe(rdev, tmp, mddev) \ | |
159ec1fc | 659 | list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) |
1da177e4 | 660 | |
4b80991c N |
661 | #define rdev_for_each_rcu(rdev, mddev) \ |
662 | list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) | |
663 | ||
2b8bf345 | 664 | struct md_thread { |
4ed8731d | 665 | void (*run) (struct md_thread *thread); |
fd01b88c | 666 | struct mddev *mddev; |
1da177e4 | 667 | wait_queue_head_t wqueue; |
f72ffdd6 | 668 | unsigned long flags; |
1da177e4 | 669 | struct task_struct *tsk; |
32a7627c | 670 | unsigned long timeout; |
4ed8731d | 671 | void *private; |
2b8bf345 | 672 | }; |
1da177e4 LT |
673 | |
674 | #define THREAD_WAKEUP 0 | |
675 | ||
1345b1d8 N |
676 | static inline void safe_put_page(struct page *p) |
677 | { | |
678 | if (p) put_page(p); | |
679 | } | |
680 | ||
84fc4b56 N |
681 | extern int register_md_personality(struct md_personality *p); |
682 | extern int unregister_md_personality(struct md_personality *p); | |
edb39c9d GR |
683 | extern int register_md_cluster_operations(struct md_cluster_operations *ops, |
684 | struct module *module); | |
685 | extern int unregister_md_cluster_operations(void); | |
686 | extern int md_setup_cluster(struct mddev *mddev, int nodes); | |
687 | extern void md_cluster_stop(struct mddev *mddev); | |
2b8bf345 | 688 | extern struct md_thread *md_register_thread( |
4ed8731d | 689 | void (*run)(struct md_thread *thread), |
2b8bf345 N |
690 | struct mddev *mddev, |
691 | const char *name); | |
692 | extern void md_unregister_thread(struct md_thread **threadp); | |
693 | extern void md_wakeup_thread(struct md_thread *thread); | |
fd01b88c | 694 | extern void md_check_recovery(struct mddev *mddev); |
a91d5ac0 | 695 | extern void md_reap_sync_thread(struct mddev *mddev); |
a415c0f1 | 696 | extern int mddev_init_writes_pending(struct mddev *mddev); |
cc27b0c7 | 697 | extern bool md_write_start(struct mddev *mddev, struct bio *bi); |
49728050 | 698 | extern void md_write_inc(struct mddev *mddev, struct bio *bi); |
fd01b88c N |
699 | extern void md_write_end(struct mddev *mddev); |
700 | extern void md_done_sync(struct mddev *mddev, int blocks, int ok); | |
701 | extern void md_error(struct mddev *mddev, struct md_rdev *rdev); | |
c6563a8c | 702 | extern void md_finish_reshape(struct mddev *mddev); |
fd01b88c N |
703 | |
704 | extern int mddev_congested(struct mddev *mddev, int bits); | |
705 | extern void md_flush_request(struct mddev *mddev, struct bio *bio); | |
706 | extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, | |
92022950 | 707 | sector_t sector, int size, struct page *page); |
46533ff7 | 708 | extern int md_super_wait(struct mddev *mddev); |
f72ffdd6 | 709 | extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
796a5cf0 MC |
710 | struct page *page, int op, int op_flags, |
711 | bool metadata_op); | |
4ed8731d | 712 | extern void md_do_sync(struct md_thread *thread); |
fd01b88c | 713 | extern void md_new_event(struct mddev *mddev); |
2214c260 | 714 | extern void md_allow_write(struct mddev *mddev); |
fd01b88c N |
715 | extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); |
716 | extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); | |
717 | extern int md_check_no_bitmap(struct mddev *mddev); | |
718 | extern int md_integrity_register(struct mddev *mddev); | |
1501efad | 719 | extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); |
72e02075 | 720 | extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); |
63fe0817 | 721 | |
fd01b88c N |
722 | extern void mddev_init(struct mddev *mddev); |
723 | extern int md_run(struct mddev *mddev); | |
d5d885fd | 724 | extern int md_start(struct mddev *mddev); |
fd01b88c N |
725 | extern void md_stop(struct mddev *mddev); |
726 | extern void md_stop_writes(struct mddev *mddev); | |
3cb03002 | 727 | extern int md_rdev_init(struct md_rdev *rdev); |
545c8795 | 728 | extern void md_rdev_clear(struct md_rdev *rdev); |
63fe0817 | 729 | |
393debc2 | 730 | extern void md_handle_request(struct mddev *mddev, struct bio *bio); |
fd01b88c N |
731 | extern void mddev_suspend(struct mddev *mddev); |
732 | extern void mddev_resume(struct mddev *mddev); | |
a167f663 | 733 | extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 734 | struct mddev *mddev); |
9cbb1750 | 735 | |
70bcecdb | 736 | extern void md_reload_sb(struct mddev *mddev, int raid_disk); |
1aee41f6 | 737 | extern void md_update_sb(struct mddev *mddev, int force); |
fb56dfef | 738 | extern void md_kick_rdev_from_array(struct md_rdev * rdev); |
963c555e GJ |
739 | extern void mddev_create_wb_pool(struct mddev *mddev, struct md_rdev *rdev, |
740 | bool is_suspend); | |
57d051dc | 741 | struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); |
1532d9e8 | 742 | struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev); |
dfe15ac1 | 743 | |
3163c3e7 GP |
744 | static inline bool is_mddev_broken(struct md_rdev *rdev, const char *md_type) |
745 | { | |
746 | int flags = rdev->bdev->bd_disk->flags; | |
747 | ||
748 | if (!(flags & GENHD_FL_UP)) { | |
749 | if (!test_and_set_bit(MD_BROKEN, &rdev->mddev->flags)) | |
750 | pr_warn("md: %s: %s array has a missing/failed member\n", | |
751 | mdname(rdev->mddev), md_type); | |
752 | return true; | |
753 | } | |
754 | return false; | |
755 | } | |
756 | ||
dfe15ac1 HR |
757 | static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) |
758 | { | |
759 | int faulty = test_bit(Faulty, &rdev->flags); | |
760 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { | |
761 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
762 | md_wakeup_thread(mddev->thread); | |
763 | } | |
764 | } | |
765 | ||
edb39c9d | 766 | extern struct md_cluster_operations *md_cluster_ops; |
c4ce867f GR |
767 | static inline int mddev_is_clustered(struct mddev *mddev) |
768 | { | |
769 | return mddev->cluster_info && mddev->bitmap_info.nodes > 1; | |
770 | } | |
394ed8e4 SL |
771 | |
772 | /* clear unsupported mddev_flags */ | |
773 | static inline void mddev_clear_unsupported_flags(struct mddev *mddev, | |
774 | unsigned long unsupported_flags) | |
775 | { | |
776 | mddev->flags &= ~unsupported_flags; | |
777 | } | |
26483819 SL |
778 | |
779 | static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio) | |
780 | { | |
781 | if (bio_op(bio) == REQ_OP_WRITE_SAME && | |
74d46992 | 782 | !bio->bi_disk->queue->limits.max_write_same_sectors) |
26483819 SL |
783 | mddev->queue->limits.max_write_same_sectors = 0; |
784 | } | |
3deff1a7 CH |
785 | |
786 | static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) | |
787 | { | |
788 | if (bio_op(bio) == REQ_OP_WRITE_ZEROES && | |
74d46992 | 789 | !bio->bi_disk->queue->limits.max_write_zeroes_sectors) |
3deff1a7 CH |
790 | mddev->queue->limits.max_write_zeroes_sectors = 0; |
791 | } | |
63fe0817 | 792 | #endif /* _MD_MD_H */ |