1 /* 2 * Copyright (C) 2007 Oracle. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #ifndef __BTRFS_VOLUMES_ 20 #define __BTRFS_VOLUMES_ 21 22 #include <linux/bio.h> 23 #include <linux/sort.h> 24 #include <linux/btrfs.h> 25 #include "async-thread.h" 26 27 extern struct mutex uuid_mutex; 28 29 #define BTRFS_STRIPE_LEN SZ_64K 30 31 struct buffer_head; 32 struct btrfs_pending_bios { 33 struct bio *head; 34 struct bio *tail; 35 }; 36 37 /* 38 * Use sequence counter to get consistent device stat data on 39 * 32-bit processors. 40 */ 41 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 42 #include <linux/seqlock.h> 43 #define __BTRFS_NEED_DEVICE_DATA_ORDERED 44 #define btrfs_device_data_ordered_init(device) \ 45 seqcount_init(&device->data_seqcount) 46 #else 47 #define btrfs_device_data_ordered_init(device) do { } while (0) 48 #endif 49 50 struct btrfs_device { 51 struct list_head dev_list; 52 struct list_head dev_alloc_list; 53 struct btrfs_fs_devices *fs_devices; 54 struct btrfs_fs_info *fs_info; 55 56 struct rcu_string *name; 57 58 u64 generation; 59 60 spinlock_t io_lock ____cacheline_aligned; 61 int running_pending; 62 /* regular prio bios */ 63 struct btrfs_pending_bios pending_bios; 64 /* sync bios */ 65 struct btrfs_pending_bios pending_sync_bios; 66 67 struct block_device *bdev; 68 69 /* the mode sent to blkdev_get */ 70 fmode_t mode; 71 72 int writeable; 73 int in_fs_metadata; 74 int missing; 75 int can_discard; 76 int is_tgtdev_for_dev_replace; 77 78 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED 79 seqcount_t data_seqcount; 80 #endif 81 82 /* the internal btrfs device id */ 83 u64 devid; 84 85 /* size of the device in memory */ 86 u64 total_bytes; 87 88 /* size of the device on disk */ 89 u64 disk_total_bytes; 90 91 /* bytes used */ 92 u64 bytes_used; 93 94 /* optimal io alignment for this device */ 95 u32 io_align; 96 97 /* optimal io width for this device */ 98 u32 io_width; 99 /* type and info about this device */ 100 u64 type; 101 102 /* minimal io size for this device */ 103 u32 sector_size; 104 105 /* physical drive uuid (or lvm uuid) */ 106 u8 uuid[BTRFS_UUID_SIZE]; 107 108 /* 109 * size of the device on the current transaction 110 * 111 * This variant is update when committing the transaction, 112 * and protected by device_list_mutex 113 */ 114 u64 commit_total_bytes; 115 116 /* bytes used on the current transaction */ 117 u64 commit_bytes_used; 118 /* 119 * used to manage the device which is resized 120 * 121 * It is protected by chunk_lock. 122 */ 123 struct list_head resized_list; 124 125 /* for sending down flush barriers */ 126 int nobarriers; 127 struct bio *flush_bio; 128 struct completion flush_wait; 129 130 /* per-device scrub information */ 131 struct scrub_ctx *scrub_device; 132 133 struct btrfs_work work; 134 struct rcu_head rcu; 135 struct work_struct rcu_work; 136 137 /* readahead state */ 138 spinlock_t reada_lock; 139 atomic_t reada_in_flight; 140 u64 reada_next; 141 struct reada_zone *reada_curr_zone; 142 struct radix_tree_root reada_zones; 143 struct radix_tree_root reada_extents; 144 145 /* disk I/O failure stats. For detailed description refer to 146 * enum btrfs_dev_stat_values in ioctl.h */ 147 int dev_stats_valid; 148 149 /* Counter to record the change of device stats */ 150 atomic_t dev_stats_ccnt; 151 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX]; 152 }; 153 154 /* 155 * If we read those variants at the context of their own lock, we needn't 156 * use the following helpers, reading them directly is safe. 157 */ 158 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 159 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 160 static inline u64 \ 161 btrfs_device_get_##name(const struct btrfs_device *dev) \ 162 { \ 163 u64 size; \ 164 unsigned int seq; \ 165 \ 166 do { \ 167 seq = read_seqcount_begin(&dev->data_seqcount); \ 168 size = dev->name; \ 169 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \ 170 return size; \ 171 } \ 172 \ 173 static inline void \ 174 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 175 { \ 176 preempt_disable(); \ 177 write_seqcount_begin(&dev->data_seqcount); \ 178 dev->name = size; \ 179 write_seqcount_end(&dev->data_seqcount); \ 180 preempt_enable(); \ 181 } 182 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) 183 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 184 static inline u64 \ 185 btrfs_device_get_##name(const struct btrfs_device *dev) \ 186 { \ 187 u64 size; \ 188 \ 189 preempt_disable(); \ 190 size = dev->name; \ 191 preempt_enable(); \ 192 return size; \ 193 } \ 194 \ 195 static inline void \ 196 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 197 { \ 198 preempt_disable(); \ 199 dev->name = size; \ 200 preempt_enable(); \ 201 } 202 #else 203 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 204 static inline u64 \ 205 btrfs_device_get_##name(const struct btrfs_device *dev) \ 206 { \ 207 return dev->name; \ 208 } \ 209 \ 210 static inline void \ 211 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 212 { \ 213 dev->name = size; \ 214 } 215 #endif 216 217 BTRFS_DEVICE_GETSET_FUNCS(total_bytes); 218 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes); 219 BTRFS_DEVICE_GETSET_FUNCS(bytes_used); 220 221 struct btrfs_fs_devices { 222 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 223 224 u64 num_devices; 225 u64 open_devices; 226 u64 rw_devices; 227 u64 missing_devices; 228 u64 total_rw_bytes; 229 u64 total_devices; 230 struct block_device *latest_bdev; 231 232 /* all of the devices in the FS, protected by a mutex 233 * so we can safely walk it to write out the supers without 234 * worrying about add/remove by the multi-device code. 235 * Scrubbing super can kick off supers writing by holding 236 * this mutex lock. 237 */ 238 struct mutex device_list_mutex; 239 struct list_head devices; 240 241 struct list_head resized_devices; 242 /* devices not currently being allocated */ 243 struct list_head alloc_list; 244 struct list_head list; 245 246 struct btrfs_fs_devices *seed; 247 int seeding; 248 249 int opened; 250 251 /* set when we find or add a device that doesn't have the 252 * nonrot flag set 253 */ 254 int rotating; 255 256 struct btrfs_fs_info *fs_info; 257 /* sysfs kobjects */ 258 struct kobject fsid_kobj; 259 struct kobject *device_dir_kobj; 260 struct completion kobj_unregister; 261 }; 262 263 #define BTRFS_BIO_INLINE_CSUM_SIZE 64 264 265 /* 266 * we need the mirror number and stripe index to be passed around 267 * the call chain while we are processing end_io (especially errors). 268 * Really, what we need is a btrfs_bio structure that has this info 269 * and is properly sized with its stripe array, but we're not there 270 * quite yet. We have our own btrfs bioset, and all of the bios 271 * we allocate are actually btrfs_io_bios. We'll cram as much of 272 * struct btrfs_bio as we can into this over time. 273 */ 274 typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err); 275 struct btrfs_io_bio { 276 unsigned int mirror_num; 277 unsigned int stripe_index; 278 u64 logical; 279 u8 *csum; 280 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; 281 u8 *csum_allocated; 282 btrfs_io_bio_end_io_t *end_io; 283 struct bio bio; 284 }; 285 286 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio) 287 { 288 return container_of(bio, struct btrfs_io_bio, bio); 289 } 290 291 struct btrfs_bio_stripe { 292 struct btrfs_device *dev; 293 u64 physical; 294 u64 length; /* only used for discard mappings */ 295 }; 296 297 struct btrfs_bio; 298 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); 299 300 struct btrfs_bio { 301 atomic_t refs; 302 atomic_t stripes_pending; 303 struct btrfs_fs_info *fs_info; 304 u64 map_type; /* get from map_lookup->type */ 305 bio_end_io_t *end_io; 306 struct bio *orig_bio; 307 unsigned long flags; 308 void *private; 309 atomic_t error; 310 int max_errors; 311 int num_stripes; 312 int mirror_num; 313 int num_tgtdevs; 314 int *tgtdev_map; 315 /* 316 * logical block numbers for the start of each stripe 317 * The last one or two are p/q. These are sorted, 318 * so raid_map[0] is the start of our full stripe 319 */ 320 u64 *raid_map; 321 struct btrfs_bio_stripe stripes[]; 322 }; 323 324 struct btrfs_device_info { 325 struct btrfs_device *dev; 326 u64 dev_offset; 327 u64 max_avail; 328 u64 total_avail; 329 }; 330 331 struct btrfs_raid_attr { 332 int sub_stripes; /* sub_stripes info for map */ 333 int dev_stripes; /* stripes per dev */ 334 int devs_max; /* max devs to use */ 335 int devs_min; /* min devs needed */ 336 int tolerated_failures; /* max tolerated fail devs */ 337 int devs_increment; /* ndevs has to be a multiple of this */ 338 int ncopies; /* how many copies to data has */ 339 }; 340 341 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES]; 342 extern const int btrfs_raid_mindev_error[BTRFS_NR_RAID_TYPES]; 343 extern const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES]; 344 345 struct map_lookup { 346 u64 type; 347 int io_align; 348 int io_width; 349 u64 stripe_len; 350 int sector_size; 351 int num_stripes; 352 int sub_stripes; 353 struct btrfs_bio_stripe stripes[]; 354 }; 355 356 #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 357 (sizeof(struct btrfs_bio_stripe) * (n))) 358 359 struct btrfs_balance_args; 360 struct btrfs_balance_progress; 361 struct btrfs_balance_control { 362 struct btrfs_fs_info *fs_info; 363 364 struct btrfs_balance_args data; 365 struct btrfs_balance_args meta; 366 struct btrfs_balance_args sys; 367 368 u64 flags; 369 370 struct btrfs_balance_progress stat; 371 }; 372 373 enum btrfs_map_op { 374 BTRFS_MAP_READ, 375 BTRFS_MAP_WRITE, 376 BTRFS_MAP_DISCARD, 377 BTRFS_MAP_GET_READ_MIRRORS, 378 }; 379 380 static inline enum btrfs_map_op btrfs_op(struct bio *bio) 381 { 382 switch (bio_op(bio)) { 383 case REQ_OP_DISCARD: 384 return BTRFS_MAP_DISCARD; 385 case REQ_OP_WRITE: 386 return BTRFS_MAP_WRITE; 387 default: 388 WARN_ON_ONCE(1); 389 case REQ_OP_READ: 390 return BTRFS_MAP_READ; 391 } 392 } 393 394 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, 395 u64 end, u64 *length); 396 void btrfs_get_bbio(struct btrfs_bio *bbio); 397 void btrfs_put_bbio(struct btrfs_bio *bbio); 398 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, 399 u64 logical, u64 *length, 400 struct btrfs_bio **bbio_ret, int mirror_num); 401 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, 402 u64 logical, u64 *length, 403 struct btrfs_bio **bbio_ret, int mirror_num, 404 int need_raid_map); 405 int btrfs_rmap_block(struct btrfs_fs_info *fs_info, 406 u64 chunk_start, u64 physical, u64 devid, 407 u64 **logical, int *naddrs, int *stripe_len); 408 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); 409 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); 410 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 411 struct btrfs_fs_info *fs_info, u64 type); 412 void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 413 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 414 int btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, 415 int mirror_num, int async_submit); 416 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 417 fmode_t flags, void *holder); 418 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 419 struct btrfs_fs_devices **fs_devices_ret); 420 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 421 void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step); 422 void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info, 423 struct btrfs_device *device, struct btrfs_device *this_dev); 424 int btrfs_find_device_missing_or_by_path(struct btrfs_fs_info *fs_info, 425 char *device_path, 426 struct btrfs_device **device); 427 int btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid, 428 char *devpath, 429 struct btrfs_device **device); 430 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, 431 const u64 *devid, 432 const u8 *uuid); 433 int btrfs_rm_device(struct btrfs_fs_info *fs_info, 434 char *device_path, u64 devid); 435 void btrfs_cleanup_fs_uuids(void); 436 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len); 437 int btrfs_grow_device(struct btrfs_trans_handle *trans, 438 struct btrfs_device *device, u64 new_size); 439 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid, 440 u8 *uuid, u8 *fsid); 441 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 442 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, char *path); 443 int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, 444 char *device_path, 445 struct btrfs_device *srcdev, 446 struct btrfs_device **device_out); 447 int btrfs_balance(struct btrfs_balance_control *bctl, 448 struct btrfs_ioctl_balance_args *bargs); 449 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); 450 int btrfs_recover_balance(struct btrfs_fs_info *fs_info); 451 int btrfs_pause_balance(struct btrfs_fs_info *fs_info); 452 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); 453 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); 454 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info); 455 int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset); 456 int find_free_dev_extent_start(struct btrfs_transaction *transaction, 457 struct btrfs_device *device, u64 num_bytes, 458 u64 search_start, u64 *start, u64 *max_avail); 459 int find_free_dev_extent(struct btrfs_trans_handle *trans, 460 struct btrfs_device *device, u64 num_bytes, 461 u64 *start, u64 *max_avail); 462 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); 463 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info, 464 struct btrfs_ioctl_get_dev_stats *stats); 465 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info); 466 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); 467 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, 468 struct btrfs_fs_info *fs_info); 469 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info *fs_info, 470 struct btrfs_device *srcdev); 471 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info, 472 struct btrfs_device *srcdev); 473 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, 474 struct btrfs_device *tgtdev); 475 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info, 476 struct btrfs_device *tgtdev); 477 void btrfs_scratch_superblocks(struct block_device *bdev, char *device_path); 478 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree, 479 u64 logical, u64 len, int mirror_num); 480 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, 481 struct btrfs_mapping_tree *map_tree, 482 u64 logical); 483 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, 484 struct btrfs_fs_info *fs_info, 485 u64 chunk_offset, u64 chunk_size); 486 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, 487 struct btrfs_fs_info *fs_info, u64 chunk_offset); 488 489 static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev) 490 { 491 return atomic_read(&dev->dev_stats_ccnt); 492 } 493 494 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, 495 int index) 496 { 497 atomic_inc(dev->dev_stat_values + index); 498 smp_mb__before_atomic(); 499 atomic_inc(&dev->dev_stats_ccnt); 500 } 501 502 static inline int btrfs_dev_stat_read(struct btrfs_device *dev, 503 int index) 504 { 505 return atomic_read(dev->dev_stat_values + index); 506 } 507 508 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev, 509 int index) 510 { 511 int ret; 512 513 ret = atomic_xchg(dev->dev_stat_values + index, 0); 514 smp_mb__before_atomic(); 515 atomic_inc(&dev->dev_stats_ccnt); 516 return ret; 517 } 518 519 static inline void btrfs_dev_stat_set(struct btrfs_device *dev, 520 int index, unsigned long val) 521 { 522 atomic_set(dev->dev_stat_values + index, val); 523 smp_mb__before_atomic(); 524 atomic_inc(&dev->dev_stats_ccnt); 525 } 526 527 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev, 528 int index) 529 { 530 btrfs_dev_stat_set(dev, index, 0); 531 } 532 533 void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info); 534 void btrfs_update_commit_device_bytes_used(struct btrfs_fs_info *fs_info, 535 struct btrfs_transaction *transaction); 536 537 struct list_head *btrfs_get_fs_uuids(void); 538 void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info); 539 void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info); 540 541 #endif 542