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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 | ||
1da177e4 LT |
21 | #define LEVEL_MULTIPATH (-4) |
22 | #define LEVEL_LINEAR (-1) | |
23 | #define LEVEL_FAULTY (-5) | |
24 | ||
2604b703 N |
25 | /* we need a value for 'no level specified' and 0 |
26 | * means 'raid0', so we need something else. This is | |
27 | * for internal use only | |
28 | */ | |
29 | #define LEVEL_NONE (-1000000) | |
30 | ||
1da177e4 LT |
31 | #define MaxSector (~(sector_t)0) |
32 | #define MD_THREAD_NAME_MAX 14 | |
33 | ||
1da177e4 LT |
34 | typedef struct mddev_s mddev_t; |
35 | typedef struct mdk_rdev_s mdk_rdev_t; | |
36 | ||
37 | #define MAX_MD_DEVS 256 /* Max number of md dev */ | |
38 | ||
39 | /* | |
40 | * options passed in raidrun: | |
41 | */ | |
42 | ||
43 | #define MAX_CHUNK_SIZE (4096*1024) | |
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 */ | |
54 | unsigned long last_events; /* IO event timestamp */ | |
55 | ||
56 | struct block_device *bdev; /* block device handle */ | |
57 | ||
58 | struct page *sb_page; | |
59 | int sb_loaded; | |
60 | sector_t data_offset; /* start of data in array */ | |
61 | sector_t sb_offset; | |
0002b271 | 62 | int sb_size; /* bytes in the superblock */ |
1da177e4 LT |
63 | int preferred_minor; /* autorun support */ |
64 | ||
86e6ffdd N |
65 | struct kobject kobj; |
66 | ||
1da177e4 LT |
67 | /* A device can be in one of three states based on two flags: |
68 | * Not working: faulty==1 in_sync==0 | |
69 | * Fully working: faulty==0 in_sync==1 | |
70 | * Working, but not | |
71 | * in sync with array | |
72 | * faulty==0 in_sync==0 | |
73 | * | |
74 | * It can never have faulty==1, in_sync==1 | |
75 | * This reduces the burden of testing multiple flags in many cases | |
76 | */ | |
1da177e4 | 77 | |
b2d444d7 N |
78 | unsigned long flags; |
79 | #define Faulty 1 /* device is known to have a fault */ | |
80 | #define In_sync 2 /* device is in_sync with rest of array */ | |
8ddf9efe | 81 | #define WriteMostly 4 /* Avoid reading if at all possible */ |
a9701a30 | 82 | #define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */ |
8ddf9efe | 83 | |
1da177e4 LT |
84 | int desc_nr; /* descriptor index in the superblock */ |
85 | int raid_disk; /* role of device in array */ | |
41158c7e N |
86 | int saved_raid_disk; /* role that device used to have in the |
87 | * array and could again if we did a partial | |
88 | * resync from the bitmap | |
89 | */ | |
1da177e4 LT |
90 | |
91 | atomic_t nr_pending; /* number of pending requests. | |
92 | * only maintained for arrays that | |
93 | * support hot removal | |
94 | */ | |
ba22dcbf N |
95 | atomic_t read_errors; /* number of consecutive read errors that |
96 | * we have tried to ignore. | |
97 | */ | |
4dbcdc75 N |
98 | atomic_t corrected_errors; /* number of corrected read errors, |
99 | * for reporting to userspace and storing | |
100 | * in superblock. | |
101 | */ | |
1da177e4 LT |
102 | }; |
103 | ||
1da177e4 LT |
104 | struct mddev_s |
105 | { | |
106 | void *private; | |
2604b703 | 107 | struct mdk_personality *pers; |
1da177e4 LT |
108 | dev_t unit; |
109 | int md_minor; | |
110 | struct list_head disks; | |
111 | int sb_dirty; | |
112 | int ro; | |
113 | ||
114 | struct gendisk *gendisk; | |
115 | ||
eae1701f N |
116 | struct kobject kobj; |
117 | ||
1da177e4 LT |
118 | /* Superblock information */ |
119 | int major_version, | |
120 | minor_version, | |
121 | patch_version; | |
122 | int persistent; | |
123 | int chunk_size; | |
124 | time_t ctime, utime; | |
125 | int level, layout; | |
d9d166c2 | 126 | char clevel[16]; |
1da177e4 LT |
127 | int raid_disks; |
128 | int max_disks; | |
129 | sector_t size; /* used size of component devices */ | |
130 | sector_t array_size; /* exported array size */ | |
131 | __u64 events; | |
132 | ||
133 | char uuid[16]; | |
134 | ||
f6705578 N |
135 | /* If the array is being reshaped, we need to record the |
136 | * new shape and an indication of where we are up to. | |
137 | * This is written to the superblock. | |
138 | * If reshape_position is MaxSector, then no reshape is happening (yet). | |
139 | */ | |
140 | sector_t reshape_position; | |
141 | int delta_disks, new_level, new_layout, new_chunk; | |
142 | ||
1da177e4 LT |
143 | struct mdk_thread_s *thread; /* management thread */ |
144 | struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */ | |
145 | sector_t curr_resync; /* blocks scheduled */ | |
146 | unsigned long resync_mark; /* a recent timestamp */ | |
147 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
148 | ||
149 | sector_t resync_max_sectors; /* may be set by personality */ | |
9d88883e N |
150 | |
151 | sector_t resync_mismatches; /* count of sectors where | |
152 | * parity/replica mismatch found | |
153 | */ | |
88202a0c N |
154 | /* if zero, use the system-wide default */ |
155 | int sync_speed_min; | |
156 | int sync_speed_max; | |
157 | ||
6ff8d8ec | 158 | int ok_start_degraded; |
1da177e4 LT |
159 | /* recovery/resync flags |
160 | * NEEDED: we might need to start a resync/recover | |
161 | * RUNNING: a thread is running, or about to be started | |
162 | * SYNC: actually doing a resync, not a recovery | |
163 | * ERR: and IO error was detected - abort the resync/recovery | |
164 | * INTR: someone requested a (clean) early abort. | |
165 | * DONE: thread is done and is waiting to be reaped | |
24dd469d N |
166 | * REQUEST: user-space has requested a sync (used with SYNC) |
167 | * CHECK: user-space request for for check-only, no repair | |
ccfcc3c1 N |
168 | * RESHAPE: A reshape is happening |
169 | * | |
170 | * If neither SYNC or RESHAPE are set, then it is a recovery. | |
1da177e4 LT |
171 | */ |
172 | #define MD_RECOVERY_RUNNING 0 | |
173 | #define MD_RECOVERY_SYNC 1 | |
174 | #define MD_RECOVERY_ERR 2 | |
175 | #define MD_RECOVERY_INTR 3 | |
176 | #define MD_RECOVERY_DONE 4 | |
177 | #define MD_RECOVERY_NEEDED 5 | |
24dd469d N |
178 | #define MD_RECOVERY_REQUESTED 6 |
179 | #define MD_RECOVERY_CHECK 7 | |
ccfcc3c1 | 180 | #define MD_RECOVERY_RESHAPE 8 |
1da177e4 LT |
181 | unsigned long recovery; |
182 | ||
183 | int in_sync; /* know to not need resync */ | |
184 | struct semaphore reconfig_sem; | |
185 | atomic_t active; | |
186 | ||
187 | int changed; /* true if we might need to reread partition info */ | |
188 | int degraded; /* whether md should consider | |
189 | * adding a spare | |
190 | */ | |
a9701a30 N |
191 | int barriers_work; /* initialised to true, cleared as soon |
192 | * as a barrier request to slave | |
193 | * fails. Only supported | |
194 | */ | |
195 | struct bio *biolist; /* bios that need to be retried | |
196 | * because BIO_RW_BARRIER is not supported | |
197 | */ | |
1da177e4 LT |
198 | |
199 | atomic_t recovery_active; /* blocks scheduled, but not written */ | |
200 | wait_queue_head_t recovery_wait; | |
201 | sector_t recovery_cp; | |
06d91a5f N |
202 | |
203 | spinlock_t write_lock; | |
3d310eb7 | 204 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
7bfa19f2 | 205 | atomic_t pending_writes; /* number of active superblock writes */ |
06d91a5f | 206 | |
1da177e4 LT |
207 | unsigned int safemode; /* if set, update "clean" superblock |
208 | * when no writes pending. | |
209 | */ | |
210 | unsigned int safemode_delay; | |
211 | struct timer_list safemode_timer; | |
212 | atomic_t writes_pending; | |
213 | request_queue_t *queue; /* for plugging ... */ | |
214 | ||
4b6d287f N |
215 | atomic_t write_behind; /* outstanding async IO */ |
216 | unsigned int max_write_behind; /* 0 = sync */ | |
217 | ||
32a7627c N |
218 | struct bitmap *bitmap; /* the bitmap for the device */ |
219 | struct file *bitmap_file; /* the bitmap file */ | |
a654b9d8 N |
220 | long bitmap_offset; /* offset from superblock of |
221 | * start of bitmap. May be | |
222 | * negative, but not '0' | |
223 | */ | |
36fa3063 N |
224 | long default_bitmap_offset; /* this is the offset to use when |
225 | * hot-adding a bitmap. It should | |
226 | * eventually be settable by sysfs. | |
227 | */ | |
32a7627c | 228 | |
1da177e4 LT |
229 | struct list_head all_mddevs; |
230 | }; | |
231 | ||
232 | ||
233 | static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev) | |
234 | { | |
b2d444d7 | 235 | int faulty = test_bit(Faulty, &rdev->flags); |
1da177e4 LT |
236 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) |
237 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
238 | } | |
239 | ||
240 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) | |
241 | { | |
242 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); | |
243 | } | |
244 | ||
2604b703 | 245 | struct mdk_personality |
1da177e4 LT |
246 | { |
247 | char *name; | |
2604b703 N |
248 | int level; |
249 | struct list_head list; | |
1da177e4 LT |
250 | struct module *owner; |
251 | int (*make_request)(request_queue_t *q, struct bio *bio); | |
252 | int (*run)(mddev_t *mddev); | |
253 | int (*stop)(mddev_t *mddev); | |
254 | void (*status)(struct seq_file *seq, mddev_t *mddev); | |
255 | /* error_handler must set ->faulty and clear ->in_sync | |
256 | * if appropriate, and should abort recovery if needed | |
257 | */ | |
258 | void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev); | |
259 | int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev); | |
260 | int (*hot_remove_disk) (mddev_t *mddev, int number); | |
261 | int (*spare_active) (mddev_t *mddev); | |
57afd89f | 262 | sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster); |
1da177e4 LT |
263 | int (*resize) (mddev_t *mddev, sector_t sectors); |
264 | int (*reshape) (mddev_t *mddev, int raid_disks); | |
265 | int (*reconfig) (mddev_t *mddev, int layout, int chunk_size); | |
36fa3063 N |
266 | /* quiesce moves between quiescence states |
267 | * 0 - fully active | |
268 | * 1 - no new requests allowed | |
269 | * others - reserved | |
270 | */ | |
271 | void (*quiesce) (mddev_t *mddev, int state); | |
1da177e4 LT |
272 | }; |
273 | ||
274 | ||
007583c9 N |
275 | struct md_sysfs_entry { |
276 | struct attribute attr; | |
277 | ssize_t (*show)(mddev_t *, char *); | |
278 | ssize_t (*store)(mddev_t *, const char *, size_t); | |
279 | }; | |
280 | ||
281 | ||
1da177e4 LT |
282 | static inline char * mdname (mddev_t * mddev) |
283 | { | |
284 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
285 | } | |
286 | ||
1da177e4 LT |
287 | /* |
288 | * iterates through some rdev ringlist. It's safe to remove the | |
289 | * current 'rdev'. Dont touch 'tmp' though. | |
290 | */ | |
291 | #define ITERATE_RDEV_GENERIC(head,rdev,tmp) \ | |
292 | \ | |
293 | for ((tmp) = (head).next; \ | |
294 | (rdev) = (list_entry((tmp), mdk_rdev_t, same_set)), \ | |
295 | (tmp) = (tmp)->next, (tmp)->prev != &(head) \ | |
296 | ; ) | |
297 | /* | |
298 | * iterates through the 'same array disks' ringlist | |
299 | */ | |
300 | #define ITERATE_RDEV(mddev,rdev,tmp) \ | |
301 | ITERATE_RDEV_GENERIC((mddev)->disks,rdev,tmp) | |
302 | ||
303 | /* | |
304 | * Iterates through 'pending RAID disks' | |
305 | */ | |
306 | #define ITERATE_RDEV_PENDING(rdev,tmp) \ | |
307 | ITERATE_RDEV_GENERIC(pending_raid_disks,rdev,tmp) | |
308 | ||
309 | typedef struct mdk_thread_s { | |
310 | void (*run) (mddev_t *mddev); | |
311 | mddev_t *mddev; | |
312 | wait_queue_head_t wqueue; | |
313 | unsigned long flags; | |
1da177e4 | 314 | struct task_struct *tsk; |
32a7627c | 315 | unsigned long timeout; |
1da177e4 LT |
316 | } mdk_thread_t; |
317 | ||
318 | #define THREAD_WAKEUP 0 | |
319 | ||
320 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ | |
321 | do { \ | |
322 | wait_queue_t __wait; \ | |
323 | init_waitqueue_entry(&__wait, current); \ | |
324 | \ | |
325 | add_wait_queue(&wq, &__wait); \ | |
326 | for (;;) { \ | |
327 | set_current_state(TASK_UNINTERRUPTIBLE); \ | |
328 | if (condition) \ | |
329 | break; \ | |
330 | spin_unlock_irq(&lock); \ | |
331 | cmd; \ | |
332 | schedule(); \ | |
333 | spin_lock_irq(&lock); \ | |
334 | } \ | |
335 | current->state = TASK_RUNNING; \ | |
336 | remove_wait_queue(&wq, &__wait); \ | |
337 | } while (0) | |
338 | ||
339 | #define wait_event_lock_irq(wq, condition, lock, cmd) \ | |
340 | do { \ | |
341 | if (condition) \ | |
342 | break; \ | |
343 | __wait_event_lock_irq(wq, condition, lock, cmd); \ | |
344 | } while (0) | |
345 | ||
1345b1d8 N |
346 | static inline void safe_put_page(struct page *p) |
347 | { | |
348 | if (p) put_page(p); | |
349 | } | |
350 | ||
1da177e4 LT |
351 | #endif |
352 |