| | 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 | |
| | 18 | /* and dm-bio-list.h is not under include/linux because.... ??? */ |
| | 19 | #include "../../../drivers/md/dm-bio-list.h" |
| | 20 | |
| | 21 | #ifdef CONFIG_BLOCK |
| | 22 | |
| | 23 | #define LEVEL_MULTIPATH (-4) |
| | 24 | #define LEVEL_LINEAR (-1) |
| | 25 | #define LEVEL_FAULTY (-5) |
| | 26 | |
| | 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 | |
| | 33 | #define MaxSector (~(sector_t)0) |
| | 34 | |
| | 35 | typedef struct mddev_s mddev_t; |
| | 36 | typedef struct mdk_rdev_s mdk_rdev_t; |
| | 37 | |
| | 38 | /* |
| | 39 | * options passed in raidrun: |
| | 40 | */ |
| | 41 | |
| | 42 | /* Currently this must fit in an 'int' */ |
| | 43 | #define MAX_CHUNK_SIZE (1<<30) |
| | 44 | |
| | 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 | 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 | __u64 sb_events; |
| | 61 | sector_t data_offset; /* start of data in array */ |
| | 62 | sector_t sb_offset; |
| | 63 | int sb_size; /* bytes in the superblock */ |
| | 64 | int preferred_minor; /* autorun support */ |
| | 65 | |
| | 66 | struct kobject kobj; |
| | 67 | |
| | 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 | */ |
| | 78 | |
| | 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 */ |
| | 82 | #define WriteMostly 4 /* Avoid reading if at all possible */ |
| | 83 | #define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */ |
| | 84 | #define AllReserved 6 /* If whole device is reserved for |
| | 85 | * one array */ |
| | 86 | #define AutoDetected 7 /* added by auto-detect */ |
| | 87 | #define Blocked 8 /* An error occured on an externally |
| | 88 | * managed array, don't allow writes |
| | 89 | * until it is cleared */ |
| | 90 | wait_queue_head_t blocked_wait; |
| | 91 | |
| | 92 | int desc_nr; /* descriptor index in the superblock */ |
| | 93 | int raid_disk; /* role of device in array */ |
| | 94 | int saved_raid_disk; /* role that device used to have in the |
| | 95 | * array and could again if we did a partial |
| | 96 | * resync from the bitmap |
| | 97 | */ |
| | 98 | sector_t recovery_offset;/* If this device has been partially |
| | 99 | * recovered, this is where we were |
| | 100 | * up to. |
| | 101 | */ |
| | 102 | |
| | 103 | atomic_t nr_pending; /* number of pending requests. |
| | 104 | * only maintained for arrays that |
| | 105 | * support hot removal |
| | 106 | */ |
| | 107 | atomic_t read_errors; /* number of consecutive read errors that |
| | 108 | * we have tried to ignore. |
| | 109 | */ |
| | 110 | atomic_t corrected_errors; /* number of corrected read errors, |
| | 111 | * for reporting to userspace and storing |
| | 112 | * in superblock. |
| | 113 | */ |
| | 114 | struct work_struct del_work; /* used for delayed sysfs removal */ |
| | 115 | }; |
| | 116 | |
| | 117 | struct mddev_s |
| | 118 | { |
| | 119 | void *private; |
| | 120 | struct mdk_personality *pers; |
| | 121 | dev_t unit; |
| | 122 | int md_minor; |
| | 123 | struct list_head disks; |
| | 124 | unsigned long flags; |
| | 125 | #define MD_CHANGE_DEVS 0 /* Some device status has changed */ |
| | 126 | #define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */ |
| | 127 | #define MD_CHANGE_PENDING 2 /* superblock update in progress */ |
| | 128 | |
| | 129 | int ro; |
| | 130 | |
| | 131 | struct gendisk *gendisk; |
| | 132 | |
| | 133 | struct kobject kobj; |
| | 134 | |
| | 135 | /* Superblock information */ |
| | 136 | int major_version, |
| | 137 | minor_version, |
| | 138 | patch_version; |
| | 139 | int persistent; |
| | 140 | int external; /* metadata is |
| | 141 | * managed externally */ |
| | 142 | char metadata_type[17]; /* externally set*/ |
| | 143 | int chunk_size; |
| | 144 | time_t ctime, utime; |
| | 145 | int level, layout; |
| | 146 | char clevel[16]; |
| | 147 | int raid_disks; |
| | 148 | int max_disks; |
| | 149 | sector_t size; /* used size of component devices */ |
| | 150 | sector_t array_size; /* exported array size */ |
| | 151 | __u64 events; |
| | 152 | |
| | 153 | char uuid[16]; |
| | 154 | |
| | 155 | /* If the array is being reshaped, we need to record the |
| | 156 | * new shape and an indication of where we are up to. |
| | 157 | * This is written to the superblock. |
| | 158 | * If reshape_position is MaxSector, then no reshape is happening (yet). |
| | 159 | */ |
| | 160 | sector_t reshape_position; |
| | 161 | int delta_disks, new_level, new_layout, new_chunk; |
| | 162 | |
| | 163 | struct mdk_thread_s *thread; /* management thread */ |
| | 164 | struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */ |
| | 165 | sector_t curr_resync; /* last block scheduled */ |
| | 166 | unsigned long resync_mark; /* a recent timestamp */ |
| | 167 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ |
| | 168 | sector_t curr_mark_cnt; /* blocks scheduled now */ |
| | 169 | |
| | 170 | sector_t resync_max_sectors; /* may be set by personality */ |
| | 171 | |
| | 172 | sector_t resync_mismatches; /* count of sectors where |
| | 173 | * parity/replica mismatch found |
| | 174 | */ |
| | 175 | |
| | 176 | /* allow user-space to request suspension of IO to regions of the array */ |
| | 177 | sector_t suspend_lo; |
| | 178 | sector_t suspend_hi; |
| | 179 | /* if zero, use the system-wide default */ |
| | 180 | int sync_speed_min; |
| | 181 | int sync_speed_max; |
| | 182 | |
| | 183 | /* resync even though the same disks are shared among md-devices */ |
| | 184 | int parallel_resync; |
| | 185 | |
| | 186 | int ok_start_degraded; |
| | 187 | /* recovery/resync flags |
| | 188 | * NEEDED: we might need to start a resync/recover |
| | 189 | * RUNNING: a thread is running, or about to be started |
| | 190 | * SYNC: actually doing a resync, not a recovery |
| | 191 | * INTR: resync needs to be aborted for some reason |
| | 192 | * DONE: thread is done and is waiting to be reaped |
| | 193 | * REQUEST: user-space has requested a sync (used with SYNC) |
| | 194 | * CHECK: user-space request for for check-only, no repair |
| | 195 | * RESHAPE: A reshape is happening |
| | 196 | * |
| | 197 | * If neither SYNC or RESHAPE are set, then it is a recovery. |
| | 198 | */ |
| | 199 | #define MD_RECOVERY_RUNNING 0 |
| | 200 | #define MD_RECOVERY_SYNC 1 |
| | 201 | #define MD_RECOVERY_INTR 3 |
| | 202 | #define MD_RECOVERY_DONE 4 |
| | 203 | #define MD_RECOVERY_NEEDED 5 |
| | 204 | #define MD_RECOVERY_REQUESTED 6 |
| | 205 | #define MD_RECOVERY_CHECK 7 |
| | 206 | #define MD_RECOVERY_RESHAPE 8 |
| | 207 | #define MD_RECOVERY_FROZEN 9 |
| | 208 | |
| | 209 | unsigned long recovery; |
| | 210 | |
| | 211 | int in_sync; /* know to not need resync */ |
| | 212 | struct mutex reconfig_mutex; |
| | 213 | atomic_t active; |
| | 214 | |
| | 215 | int changed; /* true if we might need to reread partition info */ |
| | 216 | int degraded; /* whether md should consider |
| | 217 | * adding a spare |
| | 218 | */ |
| | 219 | int barriers_work; /* initialised to true, cleared as soon |
| | 220 | * as a barrier request to slave |
| | 221 | * fails. Only supported |
| | 222 | */ |
| | 223 | struct bio *biolist; /* bios that need to be retried |
| | 224 | * because BIO_RW_BARRIER is not supported |
| | 225 | */ |
| | 226 | |
| | 227 | atomic_t recovery_active; /* blocks scheduled, but not written */ |
| | 228 | wait_queue_head_t recovery_wait; |
| | 229 | sector_t recovery_cp; |
| | 230 | sector_t resync_max; /* resync should pause |
| | 231 | * when it gets here */ |
| | 232 | |
| | 233 | spinlock_t write_lock; |
| | 234 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
| | 235 | atomic_t pending_writes; /* number of active superblock writes */ |
| | 236 | |
| | 237 | unsigned int safemode; /* if set, update "clean" superblock |
| | 238 | * when no writes pending. |
| | 239 | */ |
| | 240 | unsigned int safemode_delay; |
| | 241 | struct timer_list safemode_timer; |
| | 242 | atomic_t writes_pending; |
| | 243 | struct request_queue *queue; /* for plugging ... */ |
| | 244 | |
| | 245 | atomic_t write_behind; /* outstanding async IO */ |
| | 246 | unsigned int max_write_behind; /* 0 = sync */ |
| | 247 | |
| | 248 | struct bitmap *bitmap; /* the bitmap for the device */ |
| | 249 | struct file *bitmap_file; /* the bitmap file */ |
| | 250 | long bitmap_offset; /* offset from superblock of |
| | 251 | * start of bitmap. May be |
| | 252 | * negative, but not '0' |
| | 253 | */ |
| | 254 | long default_bitmap_offset; /* this is the offset to use when |
| | 255 | * hot-adding a bitmap. It should |
| | 256 | * eventually be settable by sysfs. |
| | 257 | */ |
| | 258 | |
| | 259 | struct list_head all_mddevs; |
| | 260 | }; |
| | 261 | |
| | 262 | |
| | 263 | static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev) |
| | 264 | { |
| | 265 | int faulty = test_bit(Faulty, &rdev->flags); |
| | 266 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) |
| | 267 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| | 268 | } |
| | 269 | |
| | 270 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) |
| | 271 | { |
| | 272 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); |
| | 273 | } |
| | 274 | |
| | 275 | struct mdk_personality |
| | 276 | { |
| | 277 | char *name; |
| | 278 | int level; |
| | 279 | struct list_head list; |
| | 280 | struct module *owner; |
| | 281 | int (*make_request)(struct request_queue *q, struct bio *bio); |
| | 282 | int (*run)(mddev_t *mddev); |
| | 283 | int (*stop)(mddev_t *mddev); |
| | 284 | void (*status)(struct seq_file *seq, mddev_t *mddev); |
| | 285 | /* error_handler must set ->faulty and clear ->in_sync |
| | 286 | * if appropriate, and should abort recovery if needed |
| | 287 | */ |
| | 288 | void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev); |
| | 289 | int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev); |
| | 290 | int (*hot_remove_disk) (mddev_t *mddev, int number); |
| | 291 | int (*spare_active) (mddev_t *mddev); |
| | 292 | sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster); |
| | 293 | int (*resize) (mddev_t *mddev, sector_t sectors); |
| | 294 | int (*check_reshape) (mddev_t *mddev); |
| | 295 | int (*start_reshape) (mddev_t *mddev); |
| | 296 | int (*reconfig) (mddev_t *mddev, int layout, int chunk_size); |
| | 297 | /* quiesce moves between quiescence states |
| | 298 | * 0 - fully active |
| | 299 | * 1 - no new requests allowed |
| | 300 | * others - reserved |
| | 301 | */ |
| | 302 | void (*quiesce) (mddev_t *mddev, int state); |
| | 303 | }; |
| | 304 | |
| | 305 | |
| | 306 | struct md_sysfs_entry { |
| | 307 | struct attribute attr; |
| | 308 | ssize_t (*show)(mddev_t *, char *); |
| | 309 | ssize_t (*store)(mddev_t *, const char *, size_t); |
| | 310 | }; |
| | 311 | |
| | 312 | |
| | 313 | static inline char * mdname (mddev_t * mddev) |
| | 314 | { |
| | 315 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; |
| | 316 | } |
| | 317 | |
| | 318 | /* |
| | 319 | * iterates through some rdev ringlist. It's safe to remove the |
| | 320 | * current 'rdev'. Dont touch 'tmp' though. |
| | 321 | */ |
| | 322 | #define rdev_for_each_list(rdev, tmp, list) \ |
| | 323 | \ |
| | 324 | for ((tmp) = (list).next; \ |
| | 325 | (rdev) = (list_entry((tmp), mdk_rdev_t, same_set)), \ |
| | 326 | (tmp) = (tmp)->next, (tmp)->prev != &(list) \ |
| | 327 | ; ) |
| | 328 | /* |
| | 329 | * iterates through the 'same array disks' ringlist |
| | 330 | */ |
| | 331 | #define rdev_for_each(rdev, tmp, mddev) \ |
| | 332 | rdev_for_each_list(rdev, tmp, (mddev)->disks) |
| | 333 | |
| | 334 | typedef struct mdk_thread_s { |
| | 335 | void (*run) (mddev_t *mddev); |
| | 336 | mddev_t *mddev; |
| | 337 | wait_queue_head_t wqueue; |
| | 338 | unsigned long flags; |
| | 339 | struct task_struct *tsk; |
| | 340 | unsigned long timeout; |
| | 341 | } mdk_thread_t; |
| | 342 | |
| | 343 | #define THREAD_WAKEUP 0 |
| | 344 | |
| | 345 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ |
| | 346 | do { \ |
| | 347 | wait_queue_t __wait; \ |
| | 348 | init_waitqueue_entry(&__wait, current); \ |
| | 349 | \ |
| | 350 | add_wait_queue(&wq, &__wait); \ |
| | 351 | for (;;) { \ |
| | 352 | set_current_state(TASK_UNINTERRUPTIBLE); \ |
| | 353 | if (condition) \ |
| | 354 | break; \ |
| | 355 | spin_unlock_irq(&lock); \ |
| | 356 | cmd; \ |
| | 357 | schedule(); \ |
| | 358 | spin_lock_irq(&lock); \ |
| | 359 | } \ |
| | 360 | current->state = TASK_RUNNING; \ |
| | 361 | remove_wait_queue(&wq, &__wait); \ |
| | 362 | } while (0) |
| | 363 | |
| | 364 | #define wait_event_lock_irq(wq, condition, lock, cmd) \ |
| | 365 | do { \ |
| | 366 | if (condition) \ |
| | 367 | break; \ |
| | 368 | __wait_event_lock_irq(wq, condition, lock, cmd); \ |
| | 369 | } while (0) |
| | 370 | |
| | 371 | static inline void safe_put_page(struct page *p) |
| | 372 | { |
| | 373 | if (p) put_page(p); |
| | 374 | } |
| | 375 | |
| | 376 | #endif /* CONFIG_BLOCK */ |
| | 377 | #endif |
| | 378 | |
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