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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 LT |
23 | #define LEVEL_MULTIPATH (-4) |
24 | #define LEVEL_LINEAR (-1) | |
25 | #define LEVEL_FAULTY (-5) | |
26 | ||
2604b703 N |
27 | /* we need a value for 'no level specified' and 0 |
28 | * means 'raid0', so we need something else. This is | |
29 | * for internal use only | |
30 | */ | |
31 | #define LEVEL_NONE (-1000000) | |
32 | ||
1da177e4 | 33 | #define MaxSector (~(sector_t)0) |
1da177e4 | 34 | |
1da177e4 LT |
35 | typedef struct mddev_s mddev_t; |
36 | typedef struct mdk_rdev_s mdk_rdev_t; | |
37 | ||
1da177e4 LT |
38 | /* |
39 | * options passed in raidrun: | |
40 | */ | |
41 | ||
e8703fe1 | 42 | /* Currently this must fit in an 'int' */ |
8932c2e0 | 43 | #define MAX_CHUNK_SIZE (1<<30) |
1da177e4 | 44 | |
1da177e4 LT |
45 | /* |
46 | * MD's 'extended' device | |
47 | */ | |
48 | struct mdk_rdev_s | |
49 | { | |
50 | struct list_head same_set; /* RAID devices within the same set */ | |
51 | ||
52 | sector_t size; /* Device size (in blocks) */ | |
53 | mddev_t *mddev; /* RAID array if running */ | |
713f6ab1 | 54 | long last_events; /* IO event timestamp */ |
1da177e4 LT |
55 | |
56 | struct block_device *bdev; /* block device handle */ | |
57 | ||
58 | struct page *sb_page; | |
59 | int sb_loaded; | |
42543769 | 60 | __u64 sb_events; |
1da177e4 | 61 | sector_t data_offset; /* start of data in array */ |
0f420358 | 62 | sector_t sb_start; /* offset of the super block (in 512byte sectors) */ |
0002b271 | 63 | int sb_size; /* bytes in the superblock */ |
1da177e4 LT |
64 | int preferred_minor; /* autorun support */ |
65 | ||
86e6ffdd N |
66 | struct kobject kobj; |
67 | ||
1da177e4 LT |
68 | /* A device can be in one of three states based on two flags: |
69 | * Not working: faulty==1 in_sync==0 | |
70 | * Fully working: faulty==0 in_sync==1 | |
71 | * Working, but not | |
72 | * in sync with array | |
73 | * faulty==0 in_sync==0 | |
74 | * | |
75 | * It can never have faulty==1, in_sync==1 | |
76 | * This reduces the burden of testing multiple flags in many cases | |
77 | */ | |
1da177e4 | 78 | |
b2d444d7 N |
79 | unsigned long flags; |
80 | #define Faulty 1 /* device is known to have a fault */ | |
81 | #define In_sync 2 /* device is in_sync with rest of array */ | |
8ddf9efe | 82 | #define WriteMostly 4 /* Avoid reading if at all possible */ |
a9701a30 | 83 | #define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */ |
c5d79adb N |
84 | #define AllReserved 6 /* If whole device is reserved for |
85 | * one array */ | |
d0fae18f | 86 | #define AutoDetected 7 /* added by auto-detect */ |
6bfe0b49 DW |
87 | #define Blocked 8 /* An error occured on an externally |
88 | * managed array, don't allow writes | |
89 | * until it is cleared */ | |
52664732 NB |
90 | #define StateChanged 9 /* Faulty or Blocked has changed during |
91 | * interrupt, so it needs to be | |
92 | * notified by the thread */ | |
6bfe0b49 | 93 | wait_queue_head_t blocked_wait; |
8ddf9efe | 94 | |
1da177e4 LT |
95 | int desc_nr; /* descriptor index in the superblock */ |
96 | int raid_disk; /* role of device in array */ | |
41158c7e N |
97 | int saved_raid_disk; /* role that device used to have in the |
98 | * array and could again if we did a partial | |
99 | * resync from the bitmap | |
100 | */ | |
5fd6c1dc N |
101 | sector_t recovery_offset;/* If this device has been partially |
102 | * recovered, this is where we were | |
103 | * up to. | |
104 | */ | |
1da177e4 LT |
105 | |
106 | atomic_t nr_pending; /* number of pending requests. | |
107 | * only maintained for arrays that | |
108 | * support hot removal | |
109 | */ | |
ba22dcbf N |
110 | atomic_t read_errors; /* number of consecutive read errors that |
111 | * we have tried to ignore. | |
112 | */ | |
4dbcdc75 N |
113 | atomic_t corrected_errors; /* number of corrected read errors, |
114 | * for reporting to userspace and storing | |
115 | * in superblock. | |
116 | */ | |
5792a285 | 117 | struct work_struct del_work; /* used for delayed sysfs removal */ |
1da177e4 LT |
118 | }; |
119 | ||
1da177e4 LT |
120 | struct mddev_s |
121 | { | |
122 | void *private; | |
2604b703 | 123 | struct mdk_personality *pers; |
1da177e4 LT |
124 | dev_t unit; |
125 | int md_minor; | |
126 | struct list_head disks; | |
850b2b42 N |
127 | unsigned long flags; |
128 | #define MD_CHANGE_DEVS 0 /* Some device status has changed */ | |
129 | #define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */ | |
130 | #define MD_CHANGE_PENDING 2 /* superblock update in progress */ | |
131 | ||
1da177e4 LT |
132 | int ro; |
133 | ||
134 | struct gendisk *gendisk; | |
135 | ||
eae1701f N |
136 | struct kobject kobj; |
137 | ||
1da177e4 LT |
138 | /* Superblock information */ |
139 | int major_version, | |
140 | minor_version, | |
141 | patch_version; | |
142 | int persistent; | |
e691063a N |
143 | int external; /* metadata is |
144 | * managed externally */ | |
145 | char metadata_type[17]; /* externally set*/ | |
1da177e4 LT |
146 | int chunk_size; |
147 | time_t ctime, utime; | |
148 | int level, layout; | |
d9d166c2 | 149 | char clevel[16]; |
1da177e4 LT |
150 | int raid_disks; |
151 | int max_disks; | |
152 | sector_t size; /* used size of component devices */ | |
f233ea5c | 153 | sector_t array_sectors; /* exported array size */ |
1da177e4 LT |
154 | __u64 events; |
155 | ||
156 | char uuid[16]; | |
157 | ||
f6705578 N |
158 | /* If the array is being reshaped, we need to record the |
159 | * new shape and an indication of where we are up to. | |
160 | * This is written to the superblock. | |
161 | * If reshape_position is MaxSector, then no reshape is happening (yet). | |
162 | */ | |
163 | sector_t reshape_position; | |
164 | int delta_disks, new_level, new_layout, new_chunk; | |
165 | ||
1da177e4 LT |
166 | struct mdk_thread_s *thread; /* management thread */ |
167 | struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */ | |
ff4e8d9a | 168 | sector_t curr_resync; /* last block scheduled */ |
1da177e4 LT |
169 | unsigned long resync_mark; /* a recent timestamp */ |
170 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
ff4e8d9a | 171 | sector_t curr_mark_cnt; /* blocks scheduled now */ |
1da177e4 LT |
172 | |
173 | sector_t resync_max_sectors; /* may be set by personality */ | |
9d88883e N |
174 | |
175 | sector_t resync_mismatches; /* count of sectors where | |
176 | * parity/replica mismatch found | |
177 | */ | |
e464eafd N |
178 | |
179 | /* allow user-space to request suspension of IO to regions of the array */ | |
180 | sector_t suspend_lo; | |
181 | sector_t suspend_hi; | |
88202a0c N |
182 | /* if zero, use the system-wide default */ |
183 | int sync_speed_min; | |
184 | int sync_speed_max; | |
185 | ||
90b08710 BS |
186 | /* resync even though the same disks are shared among md-devices */ |
187 | int parallel_resync; | |
188 | ||
6ff8d8ec | 189 | int ok_start_degraded; |
1da177e4 LT |
190 | /* recovery/resync flags |
191 | * NEEDED: we might need to start a resync/recover | |
192 | * RUNNING: a thread is running, or about to be started | |
193 | * SYNC: actually doing a resync, not a recovery | |
72a23c21 | 194 | * RECOVER: doing recovery, or need to try it. |
dfc70645 | 195 | * INTR: resync needs to be aborted for some reason |
1da177e4 | 196 | * DONE: thread is done and is waiting to be reaped |
24dd469d N |
197 | * REQUEST: user-space has requested a sync (used with SYNC) |
198 | * CHECK: user-space request for for check-only, no repair | |
ccfcc3c1 N |
199 | * RESHAPE: A reshape is happening |
200 | * | |
201 | * If neither SYNC or RESHAPE are set, then it is a recovery. | |
1da177e4 LT |
202 | */ |
203 | #define MD_RECOVERY_RUNNING 0 | |
204 | #define MD_RECOVERY_SYNC 1 | |
72a23c21 | 205 | #define MD_RECOVERY_RECOVER 2 |
1da177e4 LT |
206 | #define MD_RECOVERY_INTR 3 |
207 | #define MD_RECOVERY_DONE 4 | |
208 | #define MD_RECOVERY_NEEDED 5 | |
24dd469d N |
209 | #define MD_RECOVERY_REQUESTED 6 |
210 | #define MD_RECOVERY_CHECK 7 | |
ccfcc3c1 | 211 | #define MD_RECOVERY_RESHAPE 8 |
5fd6c1dc N |
212 | #define MD_RECOVERY_FROZEN 9 |
213 | ||
1da177e4 LT |
214 | unsigned long recovery; |
215 | ||
216 | int in_sync; /* know to not need resync */ | |
df5b89b3 | 217 | struct mutex reconfig_mutex; |
1da177e4 LT |
218 | atomic_t active; |
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 N |
239 | |
240 | spinlock_t write_lock; | |
3d310eb7 | 241 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
7bfa19f2 | 242 | atomic_t pending_writes; /* number of active superblock writes */ |
06d91a5f | 243 | |
1da177e4 LT |
244 | unsigned int safemode; /* if set, update "clean" superblock |
245 | * when no writes pending. | |
246 | */ | |
247 | unsigned int safemode_delay; | |
248 | struct timer_list safemode_timer; | |
249 | atomic_t writes_pending; | |
165125e1 | 250 | struct request_queue *queue; /* for plugging ... */ |
1da177e4 | 251 | |
4b6d287f N |
252 | atomic_t write_behind; /* outstanding async IO */ |
253 | unsigned int max_write_behind; /* 0 = sync */ | |
254 | ||
32a7627c N |
255 | struct bitmap *bitmap; /* the bitmap for the device */ |
256 | struct file *bitmap_file; /* the bitmap file */ | |
a654b9d8 N |
257 | long bitmap_offset; /* offset from superblock of |
258 | * start of bitmap. May be | |
259 | * negative, but not '0' | |
260 | */ | |
36fa3063 N |
261 | long default_bitmap_offset; /* this is the offset to use when |
262 | * hot-adding a bitmap. It should | |
263 | * eventually be settable by sysfs. | |
264 | */ | |
32a7627c | 265 | |
1da177e4 LT |
266 | struct list_head all_mddevs; |
267 | }; | |
268 | ||
269 | ||
270 | static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev) | |
271 | { | |
b2d444d7 | 272 | int faulty = test_bit(Faulty, &rdev->flags); |
1da177e4 LT |
273 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) |
274 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
275 | } | |
276 | ||
277 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) | |
278 | { | |
279 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); | |
280 | } | |
281 | ||
2604b703 | 282 | struct mdk_personality |
1da177e4 LT |
283 | { |
284 | char *name; | |
2604b703 N |
285 | int level; |
286 | struct list_head list; | |
1da177e4 | 287 | struct module *owner; |
165125e1 | 288 | int (*make_request)(struct request_queue *q, struct bio *bio); |
1da177e4 LT |
289 | int (*run)(mddev_t *mddev); |
290 | int (*stop)(mddev_t *mddev); | |
291 | void (*status)(struct seq_file *seq, mddev_t *mddev); | |
292 | /* error_handler must set ->faulty and clear ->in_sync | |
293 | * if appropriate, and should abort recovery if needed | |
294 | */ | |
295 | void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev); | |
296 | int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev); | |
297 | int (*hot_remove_disk) (mddev_t *mddev, int number); | |
298 | int (*spare_active) (mddev_t *mddev); | |
57afd89f | 299 | sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster); |
1da177e4 | 300 | int (*resize) (mddev_t *mddev, sector_t sectors); |
63c70c4f N |
301 | int (*check_reshape) (mddev_t *mddev); |
302 | int (*start_reshape) (mddev_t *mddev); | |
1da177e4 | 303 | int (*reconfig) (mddev_t *mddev, int layout, int chunk_size); |
36fa3063 N |
304 | /* quiesce moves between quiescence states |
305 | * 0 - fully active | |
306 | * 1 - no new requests allowed | |
307 | * others - reserved | |
308 | */ | |
309 | void (*quiesce) (mddev_t *mddev, int state); | |
1da177e4 LT |
310 | }; |
311 | ||
312 | ||
007583c9 N |
313 | struct md_sysfs_entry { |
314 | struct attribute attr; | |
315 | ssize_t (*show)(mddev_t *, char *); | |
316 | ssize_t (*store)(mddev_t *, const char *, size_t); | |
317 | }; | |
318 | ||
319 | ||
1da177e4 LT |
320 | static inline char * mdname (mddev_t * mddev) |
321 | { | |
322 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
323 | } | |
324 | ||
1da177e4 LT |
325 | /* |
326 | * iterates through some rdev ringlist. It's safe to remove the | |
327 | * current 'rdev'. Dont touch 'tmp' though. | |
328 | */ | |
73c34431 | 329 | #define rdev_for_each_list(rdev, tmp, list) \ |
1da177e4 | 330 | \ |
73c34431 | 331 | for ((tmp) = (list).next; \ |
1da177e4 | 332 | (rdev) = (list_entry((tmp), mdk_rdev_t, same_set)), \ |
73c34431 | 333 | (tmp) = (tmp)->next, (tmp)->prev != &(list) \ |
1da177e4 LT |
334 | ; ) |
335 | /* | |
336 | * iterates through the 'same array disks' ringlist | |
337 | */ | |
d089c6af | 338 | #define rdev_for_each(rdev, tmp, mddev) \ |
73c34431 | 339 | rdev_for_each_list(rdev, tmp, (mddev)->disks) |
1da177e4 LT |
340 | |
341 | typedef struct mdk_thread_s { | |
342 | void (*run) (mddev_t *mddev); | |
343 | mddev_t *mddev; | |
344 | wait_queue_head_t wqueue; | |
345 | unsigned long flags; | |
1da177e4 | 346 | struct task_struct *tsk; |
32a7627c | 347 | unsigned long timeout; |
1da177e4 LT |
348 | } mdk_thread_t; |
349 | ||
350 | #define THREAD_WAKEUP 0 | |
351 | ||
352 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ | |
353 | do { \ | |
354 | wait_queue_t __wait; \ | |
355 | init_waitqueue_entry(&__wait, current); \ | |
356 | \ | |
357 | add_wait_queue(&wq, &__wait); \ | |
358 | for (;;) { \ | |
359 | set_current_state(TASK_UNINTERRUPTIBLE); \ | |
360 | if (condition) \ | |
361 | break; \ | |
362 | spin_unlock_irq(&lock); \ | |
363 | cmd; \ | |
364 | schedule(); \ | |
365 | spin_lock_irq(&lock); \ | |
366 | } \ | |
367 | current->state = TASK_RUNNING; \ | |
368 | remove_wait_queue(&wq, &__wait); \ | |
369 | } while (0) | |
370 | ||
371 | #define wait_event_lock_irq(wq, condition, lock, cmd) \ | |
372 | do { \ | |
373 | if (condition) \ | |
374 | break; \ | |
375 | __wait_event_lock_irq(wq, condition, lock, cmd); \ | |
376 | } while (0) | |
377 | ||
1345b1d8 N |
378 | static inline void safe_put_page(struct page *p) |
379 | { | |
380 | if (p) put_page(p); | |
381 | } | |
382 | ||
9361401e | 383 | #endif /* CONFIG_BLOCK */ |
1da177e4 LT |
384 | #endif |
385 |