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1da177e4 LT |
1 | /* |
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 | ||
06d91a5f N |
18 | /* and dm-bio-list.h is not under include/linux because.... ??? */ |
19 | #include "../../../drivers/md/dm-bio-list.h" | |
20 | ||
9361401e DH |
21 | #ifdef CONFIG_BLOCK |
22 | ||
1da177e4 | 23 | #define MaxSector (~(sector_t)0) |
1da177e4 | 24 | |
1da177e4 LT |
25 | typedef struct mddev_s mddev_t; |
26 | typedef struct mdk_rdev_s mdk_rdev_t; | |
27 | ||
1da177e4 LT |
28 | /* |
29 | * options passed in raidrun: | |
30 | */ | |
31 | ||
e8703fe1 | 32 | /* Currently this must fit in an 'int' */ |
8932c2e0 | 33 | #define MAX_CHUNK_SIZE (1<<30) |
1da177e4 | 34 | |
1da177e4 LT |
35 | /* |
36 | * MD's 'extended' device | |
37 | */ | |
38 | struct mdk_rdev_s | |
39 | { | |
40 | struct list_head same_set; /* RAID devices within the same set */ | |
41 | ||
42 | sector_t size; /* Device size (in blocks) */ | |
43 | mddev_t *mddev; /* RAID array if running */ | |
eea1bf38 | 44 | int last_events; /* IO event timestamp */ |
1da177e4 LT |
45 | |
46 | struct block_device *bdev; /* block device handle */ | |
47 | ||
48 | struct page *sb_page; | |
49 | int sb_loaded; | |
42543769 | 50 | __u64 sb_events; |
1da177e4 | 51 | sector_t data_offset; /* start of data in array */ |
0f420358 | 52 | sector_t sb_start; /* offset of the super block (in 512byte sectors) */ |
0002b271 | 53 | int sb_size; /* bytes in the superblock */ |
1da177e4 LT |
54 | int preferred_minor; /* autorun support */ |
55 | ||
86e6ffdd N |
56 | struct kobject kobj; |
57 | ||
1da177e4 LT |
58 | /* A device can be in one of three states based on two flags: |
59 | * Not working: faulty==1 in_sync==0 | |
60 | * Fully working: faulty==0 in_sync==1 | |
61 | * Working, but not | |
62 | * in sync with array | |
63 | * faulty==0 in_sync==0 | |
64 | * | |
65 | * It can never have faulty==1, in_sync==1 | |
66 | * This reduces the burden of testing multiple flags in many cases | |
67 | */ | |
1da177e4 | 68 | |
b2d444d7 N |
69 | unsigned long flags; |
70 | #define Faulty 1 /* device is known to have a fault */ | |
71 | #define In_sync 2 /* device is in_sync with rest of array */ | |
8ddf9efe | 72 | #define WriteMostly 4 /* Avoid reading if at all possible */ |
a9701a30 | 73 | #define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */ |
c5d79adb N |
74 | #define AllReserved 6 /* If whole device is reserved for |
75 | * one array */ | |
d0fae18f | 76 | #define AutoDetected 7 /* added by auto-detect */ |
6bfe0b49 DW |
77 | #define Blocked 8 /* An error occured on an externally |
78 | * managed array, don't allow writes | |
79 | * until it is cleared */ | |
52664732 NB |
80 | #define StateChanged 9 /* Faulty or Blocked has changed during |
81 | * interrupt, so it needs to be | |
82 | * notified by the thread */ | |
6bfe0b49 | 83 | wait_queue_head_t blocked_wait; |
8ddf9efe | 84 | |
1da177e4 LT |
85 | int desc_nr; /* descriptor index in the superblock */ |
86 | int raid_disk; /* role of device in array */ | |
41158c7e N |
87 | int saved_raid_disk; /* role that device used to have in the |
88 | * array and could again if we did a partial | |
89 | * resync from the bitmap | |
90 | */ | |
5fd6c1dc N |
91 | sector_t recovery_offset;/* If this device has been partially |
92 | * recovered, this is where we were | |
93 | * up to. | |
94 | */ | |
1da177e4 LT |
95 | |
96 | atomic_t nr_pending; /* number of pending requests. | |
97 | * only maintained for arrays that | |
98 | * support hot removal | |
99 | */ | |
ba22dcbf N |
100 | atomic_t read_errors; /* number of consecutive read errors that |
101 | * we have tried to ignore. | |
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 */ | |
1da177e4 LT |
111 | }; |
112 | ||
1da177e4 LT |
113 | struct mddev_s |
114 | { | |
115 | void *private; | |
2604b703 | 116 | struct mdk_personality *pers; |
1da177e4 LT |
117 | dev_t unit; |
118 | int md_minor; | |
119 | struct list_head disks; | |
850b2b42 N |
120 | unsigned long flags; |
121 | #define MD_CHANGE_DEVS 0 /* Some device status has changed */ | |
122 | #define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */ | |
123 | #define MD_CHANGE_PENDING 2 /* superblock update in progress */ | |
124 | ||
1da177e4 LT |
125 | int ro; |
126 | ||
127 | struct gendisk *gendisk; | |
128 | ||
eae1701f | 129 | struct kobject kobj; |
d3374825 N |
130 | int hold_active; |
131 | #define UNTIL_IOCTL 1 | |
efeb53c0 | 132 | #define UNTIL_STOP 2 |
eae1701f | 133 | |
1da177e4 LT |
134 | /* Superblock information */ |
135 | int major_version, | |
136 | minor_version, | |
137 | patch_version; | |
138 | int persistent; | |
e691063a N |
139 | int external; /* metadata is |
140 | * managed externally */ | |
141 | char metadata_type[17]; /* externally set*/ | |
1da177e4 LT |
142 | int chunk_size; |
143 | time_t ctime, utime; | |
144 | int level, layout; | |
d9d166c2 | 145 | char clevel[16]; |
1da177e4 LT |
146 | int raid_disks; |
147 | int max_disks; | |
148 | sector_t size; /* used size of component devices */ | |
f233ea5c | 149 | sector_t array_sectors; /* exported array size */ |
1da177e4 LT |
150 | __u64 events; |
151 | ||
152 | char uuid[16]; | |
153 | ||
f6705578 N |
154 | /* If the array is being reshaped, we need to record the |
155 | * new shape and an indication of where we are up to. | |
156 | * This is written to the superblock. | |
157 | * If reshape_position is MaxSector, then no reshape is happening (yet). | |
158 | */ | |
159 | sector_t reshape_position; | |
160 | int delta_disks, new_level, new_layout, new_chunk; | |
161 | ||
1da177e4 LT |
162 | struct mdk_thread_s *thread; /* management thread */ |
163 | struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */ | |
ff4e8d9a | 164 | sector_t curr_resync; /* last block scheduled */ |
1da177e4 LT |
165 | unsigned long resync_mark; /* a recent timestamp */ |
166 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
ff4e8d9a | 167 | sector_t curr_mark_cnt; /* blocks scheduled now */ |
1da177e4 LT |
168 | |
169 | sector_t resync_max_sectors; /* may be set by personality */ | |
9d88883e N |
170 | |
171 | sector_t resync_mismatches; /* count of sectors where | |
172 | * parity/replica mismatch found | |
173 | */ | |
e464eafd N |
174 | |
175 | /* allow user-space to request suspension of IO to regions of the array */ | |
176 | sector_t suspend_lo; | |
177 | sector_t suspend_hi; | |
88202a0c N |
178 | /* if zero, use the system-wide default */ |
179 | int sync_speed_min; | |
180 | int sync_speed_max; | |
181 | ||
90b08710 BS |
182 | /* resync even though the same disks are shared among md-devices */ |
183 | int parallel_resync; | |
184 | ||
6ff8d8ec | 185 | int ok_start_degraded; |
1da177e4 LT |
186 | /* recovery/resync flags |
187 | * NEEDED: we might need to start a resync/recover | |
188 | * RUNNING: a thread is running, or about to be started | |
189 | * SYNC: actually doing a resync, not a recovery | |
72a23c21 | 190 | * RECOVER: doing recovery, or need to try it. |
dfc70645 | 191 | * INTR: resync needs to be aborted for some reason |
1da177e4 | 192 | * DONE: thread is done and is waiting to be reaped |
24dd469d N |
193 | * REQUEST: user-space has requested a sync (used with SYNC) |
194 | * CHECK: user-space request for for check-only, no repair | |
ccfcc3c1 N |
195 | * RESHAPE: A reshape is happening |
196 | * | |
197 | * If neither SYNC or RESHAPE are set, then it is a recovery. | |
1da177e4 LT |
198 | */ |
199 | #define MD_RECOVERY_RUNNING 0 | |
200 | #define MD_RECOVERY_SYNC 1 | |
72a23c21 | 201 | #define MD_RECOVERY_RECOVER 2 |
1da177e4 LT |
202 | #define MD_RECOVERY_INTR 3 |
203 | #define MD_RECOVERY_DONE 4 | |
204 | #define MD_RECOVERY_NEEDED 5 | |
24dd469d N |
205 | #define MD_RECOVERY_REQUESTED 6 |
206 | #define MD_RECOVERY_CHECK 7 | |
ccfcc3c1 | 207 | #define MD_RECOVERY_RESHAPE 8 |
5fd6c1dc N |
208 | #define MD_RECOVERY_FROZEN 9 |
209 | ||
1da177e4 | 210 | unsigned long recovery; |
4044ba58 N |
211 | int recovery_disabled; /* if we detect that recovery |
212 | * will always fail, set this | |
213 | * so we don't loop trying */ | |
1da177e4 LT |
214 | |
215 | int in_sync; /* know to not need resync */ | |
df5b89b3 | 216 | struct mutex reconfig_mutex; |
f2ea68cf N |
217 | atomic_t active; /* general refcount */ |
218 | atomic_t openers; /* number of active opens */ | |
1da177e4 | 219 | |
44ce6294 | 220 | int changed; /* true if we might need to reread partition info */ |
1da177e4 LT |
221 | int degraded; /* whether md should consider |
222 | * adding a spare | |
223 | */ | |
a9701a30 N |
224 | int barriers_work; /* initialised to true, cleared as soon |
225 | * as a barrier request to slave | |
226 | * fails. Only supported | |
227 | */ | |
228 | struct bio *biolist; /* bios that need to be retried | |
229 | * because BIO_RW_BARRIER is not supported | |
230 | */ | |
1da177e4 LT |
231 | |
232 | atomic_t recovery_active; /* blocks scheduled, but not written */ | |
233 | wait_queue_head_t recovery_wait; | |
234 | sector_t recovery_cp; | |
5e96ee65 NB |
235 | sector_t resync_min; /* user requested sync |
236 | * starts here */ | |
c6207277 N |
237 | sector_t resync_max; /* resync should pause |
238 | * when it gets here */ | |
06d91a5f | 239 | |
b62b7590 N |
240 | struct sysfs_dirent *sysfs_state; /* handle for 'array_state' |
241 | * file in sysfs. | |
242 | */ | |
0c3573f1 | 243 | struct sysfs_dirent *sysfs_action; /* handle for 'sync_action' */ |
b62b7590 | 244 | |
d3374825 N |
245 | struct work_struct del_work; /* used for delayed sysfs removal */ |
246 | ||
06d91a5f | 247 | spinlock_t write_lock; |
3d310eb7 | 248 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
7bfa19f2 | 249 | atomic_t pending_writes; /* number of active superblock writes */ |
06d91a5f | 250 | |
1da177e4 LT |
251 | unsigned int safemode; /* if set, update "clean" superblock |
252 | * when no writes pending. | |
253 | */ | |
254 | unsigned int safemode_delay; | |
255 | struct timer_list safemode_timer; | |
256 | atomic_t writes_pending; | |
165125e1 | 257 | struct request_queue *queue; /* for plugging ... */ |
1da177e4 | 258 | |
4b6d287f N |
259 | atomic_t write_behind; /* outstanding async IO */ |
260 | unsigned int max_write_behind; /* 0 = sync */ | |
261 | ||
32a7627c N |
262 | struct bitmap *bitmap; /* the bitmap for the device */ |
263 | struct file *bitmap_file; /* the bitmap file */ | |
a654b9d8 N |
264 | long bitmap_offset; /* offset from superblock of |
265 | * start of bitmap. May be | |
266 | * negative, but not '0' | |
267 | */ | |
36fa3063 N |
268 | long default_bitmap_offset; /* this is the offset to use when |
269 | * hot-adding a bitmap. It should | |
270 | * eventually be settable by sysfs. | |
271 | */ | |
32a7627c | 272 | |
1da177e4 LT |
273 | struct list_head all_mddevs; |
274 | }; | |
275 | ||
276 | ||
277 | static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev) | |
278 | { | |
b2d444d7 | 279 | int faulty = test_bit(Faulty, &rdev->flags); |
1da177e4 LT |
280 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) |
281 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
282 | } | |
283 | ||
284 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) | |
285 | { | |
286 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); | |
287 | } | |
288 | ||
2604b703 | 289 | struct mdk_personality |
1da177e4 LT |
290 | { |
291 | char *name; | |
2604b703 N |
292 | int level; |
293 | struct list_head list; | |
1da177e4 | 294 | struct module *owner; |
165125e1 | 295 | int (*make_request)(struct request_queue *q, struct bio *bio); |
1da177e4 LT |
296 | int (*run)(mddev_t *mddev); |
297 | int (*stop)(mddev_t *mddev); | |
298 | void (*status)(struct seq_file *seq, mddev_t *mddev); | |
299 | /* error_handler must set ->faulty and clear ->in_sync | |
300 | * if appropriate, and should abort recovery if needed | |
301 | */ | |
302 | void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev); | |
303 | int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev); | |
304 | int (*hot_remove_disk) (mddev_t *mddev, int number); | |
305 | int (*spare_active) (mddev_t *mddev); | |
57afd89f | 306 | sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster); |
1da177e4 | 307 | int (*resize) (mddev_t *mddev, sector_t sectors); |
63c70c4f N |
308 | int (*check_reshape) (mddev_t *mddev); |
309 | int (*start_reshape) (mddev_t *mddev); | |
1da177e4 | 310 | int (*reconfig) (mddev_t *mddev, int layout, int chunk_size); |
36fa3063 N |
311 | /* quiesce moves between quiescence states |
312 | * 0 - fully active | |
313 | * 1 - no new requests allowed | |
314 | * others - reserved | |
315 | */ | |
316 | void (*quiesce) (mddev_t *mddev, int state); | |
1da177e4 LT |
317 | }; |
318 | ||
319 | ||
007583c9 N |
320 | struct md_sysfs_entry { |
321 | struct attribute attr; | |
322 | ssize_t (*show)(mddev_t *, char *); | |
323 | ssize_t (*store)(mddev_t *, const char *, size_t); | |
324 | }; | |
325 | ||
326 | ||
1da177e4 LT |
327 | static inline char * mdname (mddev_t * mddev) |
328 | { | |
329 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
330 | } | |
331 | ||
1da177e4 LT |
332 | /* |
333 | * iterates through some rdev ringlist. It's safe to remove the | |
334 | * current 'rdev'. Dont touch 'tmp' though. | |
335 | */ | |
159ec1fc CR |
336 | #define rdev_for_each_list(rdev, tmp, head) \ |
337 | list_for_each_entry_safe(rdev, tmp, head, same_set) | |
338 | ||
1da177e4 LT |
339 | /* |
340 | * iterates through the 'same array disks' ringlist | |
341 | */ | |
d089c6af | 342 | #define rdev_for_each(rdev, tmp, mddev) \ |
159ec1fc | 343 | list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) |
1da177e4 | 344 | |
4b80991c N |
345 | #define rdev_for_each_rcu(rdev, mddev) \ |
346 | list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) | |
347 | ||
1da177e4 LT |
348 | typedef struct mdk_thread_s { |
349 | void (*run) (mddev_t *mddev); | |
350 | mddev_t *mddev; | |
351 | wait_queue_head_t wqueue; | |
352 | unsigned long flags; | |
1da177e4 | 353 | struct task_struct *tsk; |
32a7627c | 354 | unsigned long timeout; |
1da177e4 LT |
355 | } mdk_thread_t; |
356 | ||
357 | #define THREAD_WAKEUP 0 | |
358 | ||
359 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ | |
360 | do { \ | |
361 | wait_queue_t __wait; \ | |
362 | init_waitqueue_entry(&__wait, current); \ | |
363 | \ | |
364 | add_wait_queue(&wq, &__wait); \ | |
365 | for (;;) { \ | |
366 | set_current_state(TASK_UNINTERRUPTIBLE); \ | |
367 | if (condition) \ | |
368 | break; \ | |
369 | spin_unlock_irq(&lock); \ | |
370 | cmd; \ | |
371 | schedule(); \ | |
372 | spin_lock_irq(&lock); \ | |
373 | } \ | |
374 | current->state = TASK_RUNNING; \ | |
375 | remove_wait_queue(&wq, &__wait); \ | |
376 | } while (0) | |
377 | ||
378 | #define wait_event_lock_irq(wq, condition, lock, cmd) \ | |
379 | do { \ | |
380 | if (condition) \ | |
381 | break; \ | |
382 | __wait_event_lock_irq(wq, condition, lock, cmd); \ | |
383 | } while (0) | |
384 | ||
1345b1d8 N |
385 | static inline void safe_put_page(struct page *p) |
386 | { | |
387 | if (p) put_page(p); | |
388 | } | |
389 | ||
9361401e | 390 | #endif /* CONFIG_BLOCK */ |
1da177e4 LT |
391 | #endif |
392 | ||
92022950 N |
393 | |
394 | extern int register_md_personality(struct mdk_personality *p); | |
395 | extern int unregister_md_personality(struct mdk_personality *p); | |
396 | extern mdk_thread_t * md_register_thread(void (*run) (mddev_t *mddev), | |
397 | mddev_t *mddev, const char *name); | |
398 | extern void md_unregister_thread(mdk_thread_t *thread); | |
399 | extern void md_wakeup_thread(mdk_thread_t *thread); | |
400 | extern void md_check_recovery(mddev_t *mddev); | |
401 | extern void md_write_start(mddev_t *mddev, struct bio *bi); | |
402 | extern void md_write_end(mddev_t *mddev); | |
403 | extern void md_done_sync(mddev_t *mddev, int blocks, int ok); | |
404 | extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev); | |
405 | ||
406 | extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
407 | sector_t sector, int size, struct page *page); | |
408 | extern void md_super_wait(mddev_t *mddev); | |
409 | extern int sync_page_io(struct block_device *bdev, sector_t sector, int size, | |
410 | struct page *page, int rw); | |
411 | extern void md_do_sync(mddev_t *mddev); | |
412 | extern void md_new_event(mddev_t *mddev); | |
413 | extern int md_allow_write(mddev_t *mddev); | |
414 | extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev); |