1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #ifndef BTRFS_VOLUMES_H 7 #define BTRFS_VOLUMES_H 8 9 #include <linux/sort.h> 10 #include <linux/btrfs.h> 11 #include "async-thread.h" 12 #include "messages.h" 13 #include "tree-checker.h" 14 #include "rcu-string.h" 15 16 #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G) 17 18 extern struct mutex uuid_mutex; 19 20 #define BTRFS_STRIPE_LEN SZ_64K 21 22 /* Used by sanity check for btrfs_raid_types. */ 23 #define const_ffs(n) (__builtin_ctzll(n) + 1) 24 25 /* 26 * The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires 27 * RAID0 always to be the lowest profile bit. 28 * Although it's part of on-disk format and should never change, do extra 29 * compile-time sanity checks. 30 */ 31 static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) < 32 const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0)); 33 static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) > 34 ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK)); 35 36 /* ilog2() can handle both constants and variables */ 37 #define BTRFS_BG_FLAG_TO_INDEX(profile) \ 38 ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1)) 39 40 enum btrfs_raid_types { 41 /* SINGLE is the special one as it doesn't have on-disk bit. */ 42 BTRFS_RAID_SINGLE = 0, 43 44 BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0), 45 BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1), 46 BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP), 47 BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10), 48 BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5), 49 BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6), 50 BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3), 51 BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4), 52 53 BTRFS_NR_RAID_TYPES 54 }; 55 56 struct btrfs_io_geometry { 57 /* remaining bytes before crossing a stripe */ 58 u64 len; 59 /* offset of logical address in chunk */ 60 u64 offset; 61 /* length of single IO stripe */ 62 u32 stripe_len; 63 /* offset of address in stripe */ 64 u32 stripe_offset; 65 /* number of stripe where address falls */ 66 u64 stripe_nr; 67 /* offset of raid56 stripe into the chunk */ 68 u64 raid56_stripe_offset; 69 }; 70 71 /* 72 * Use sequence counter to get consistent device stat data on 73 * 32-bit processors. 74 */ 75 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 76 #include <linux/seqlock.h> 77 #define __BTRFS_NEED_DEVICE_DATA_ORDERED 78 #define btrfs_device_data_ordered_init(device) \ 79 seqcount_init(&device->data_seqcount) 80 #else 81 #define btrfs_device_data_ordered_init(device) do { } while (0) 82 #endif 83 84 #define BTRFS_DEV_STATE_WRITEABLE (0) 85 #define BTRFS_DEV_STATE_IN_FS_METADATA (1) 86 #define BTRFS_DEV_STATE_MISSING (2) 87 #define BTRFS_DEV_STATE_REPLACE_TGT (3) 88 #define BTRFS_DEV_STATE_FLUSH_SENT (4) 89 #define BTRFS_DEV_STATE_NO_READA (5) 90 91 struct btrfs_zoned_device_info; 92 93 struct btrfs_device { 94 struct list_head dev_list; /* device_list_mutex */ 95 struct list_head dev_alloc_list; /* chunk mutex */ 96 struct list_head post_commit_list; /* chunk mutex */ 97 struct btrfs_fs_devices *fs_devices; 98 struct btrfs_fs_info *fs_info; 99 100 struct rcu_string __rcu *name; 101 102 u64 generation; 103 104 struct block_device *bdev; 105 106 struct btrfs_zoned_device_info *zone_info; 107 108 /* the mode sent to blkdev_get */ 109 fmode_t mode; 110 111 /* 112 * Device's major-minor number. Must be set even if the device is not 113 * opened (bdev == NULL), unless the device is missing. 114 */ 115 dev_t devt; 116 unsigned long dev_state; 117 blk_status_t last_flush_error; 118 119 #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED 120 seqcount_t data_seqcount; 121 #endif 122 123 /* the internal btrfs device id */ 124 u64 devid; 125 126 /* size of the device in memory */ 127 u64 total_bytes; 128 129 /* size of the device on disk */ 130 u64 disk_total_bytes; 131 132 /* bytes used */ 133 u64 bytes_used; 134 135 /* optimal io alignment for this device */ 136 u32 io_align; 137 138 /* optimal io width for this device */ 139 u32 io_width; 140 /* type and info about this device */ 141 u64 type; 142 143 /* minimal io size for this device */ 144 u32 sector_size; 145 146 /* physical drive uuid (or lvm uuid) */ 147 u8 uuid[BTRFS_UUID_SIZE]; 148 149 /* 150 * size of the device on the current transaction 151 * 152 * This variant is update when committing the transaction, 153 * and protected by chunk mutex 154 */ 155 u64 commit_total_bytes; 156 157 /* bytes used on the current transaction */ 158 u64 commit_bytes_used; 159 160 /* Bio used for flushing device barriers */ 161 struct bio flush_bio; 162 struct completion flush_wait; 163 164 /* per-device scrub information */ 165 struct scrub_ctx *scrub_ctx; 166 167 /* disk I/O failure stats. For detailed description refer to 168 * enum btrfs_dev_stat_values in ioctl.h */ 169 int dev_stats_valid; 170 171 /* Counter to record the change of device stats */ 172 atomic_t dev_stats_ccnt; 173 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX]; 174 175 struct extent_io_tree alloc_state; 176 177 struct completion kobj_unregister; 178 /* For sysfs/FSID/devinfo/devid/ */ 179 struct kobject devid_kobj; 180 181 /* Bandwidth limit for scrub, in bytes */ 182 u64 scrub_speed_max; 183 }; 184 185 /* 186 * Block group or device which contains an active swapfile. Used for preventing 187 * unsafe operations while a swapfile is active. 188 * 189 * These are sorted on (ptr, inode) (note that a block group or device can 190 * contain more than one swapfile). We compare the pointer values because we 191 * don't actually care what the object is, we just need a quick check whether 192 * the object exists in the rbtree. 193 */ 194 struct btrfs_swapfile_pin { 195 struct rb_node node; 196 void *ptr; 197 struct inode *inode; 198 /* 199 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr 200 * points to a struct btrfs_device. 201 */ 202 bool is_block_group; 203 /* 204 * Only used when 'is_block_group' is true and it is the number of 205 * extents used by a swapfile for this block group ('ptr' field). 206 */ 207 int bg_extent_count; 208 }; 209 210 /* 211 * If we read those variants at the context of their own lock, we needn't 212 * use the following helpers, reading them directly is safe. 213 */ 214 #if BITS_PER_LONG==32 && defined(CONFIG_SMP) 215 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 216 static inline u64 \ 217 btrfs_device_get_##name(const struct btrfs_device *dev) \ 218 { \ 219 u64 size; \ 220 unsigned int seq; \ 221 \ 222 do { \ 223 seq = read_seqcount_begin(&dev->data_seqcount); \ 224 size = dev->name; \ 225 } while (read_seqcount_retry(&dev->data_seqcount, seq)); \ 226 return size; \ 227 } \ 228 \ 229 static inline void \ 230 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 231 { \ 232 preempt_disable(); \ 233 write_seqcount_begin(&dev->data_seqcount); \ 234 dev->name = size; \ 235 write_seqcount_end(&dev->data_seqcount); \ 236 preempt_enable(); \ 237 } 238 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) 239 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 240 static inline u64 \ 241 btrfs_device_get_##name(const struct btrfs_device *dev) \ 242 { \ 243 u64 size; \ 244 \ 245 preempt_disable(); \ 246 size = dev->name; \ 247 preempt_enable(); \ 248 return size; \ 249 } \ 250 \ 251 static inline void \ 252 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 253 { \ 254 preempt_disable(); \ 255 dev->name = size; \ 256 preempt_enable(); \ 257 } 258 #else 259 #define BTRFS_DEVICE_GETSET_FUNCS(name) \ 260 static inline u64 \ 261 btrfs_device_get_##name(const struct btrfs_device *dev) \ 262 { \ 263 return dev->name; \ 264 } \ 265 \ 266 static inline void \ 267 btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ 268 { \ 269 dev->name = size; \ 270 } 271 #endif 272 273 BTRFS_DEVICE_GETSET_FUNCS(total_bytes); 274 BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes); 275 BTRFS_DEVICE_GETSET_FUNCS(bytes_used); 276 277 enum btrfs_chunk_allocation_policy { 278 BTRFS_CHUNK_ALLOC_REGULAR, 279 BTRFS_CHUNK_ALLOC_ZONED, 280 }; 281 282 /* 283 * Read policies for mirrored block group profiles, read picks the stripe based 284 * on these policies. 285 */ 286 enum btrfs_read_policy { 287 /* Use process PID to choose the stripe */ 288 BTRFS_READ_POLICY_PID, 289 BTRFS_NR_READ_POLICY, 290 }; 291 292 struct btrfs_fs_devices { 293 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 294 u8 metadata_uuid[BTRFS_FSID_SIZE]; 295 bool fsid_change; 296 struct list_head fs_list; 297 298 /* 299 * Number of devices under this fsid including missing and 300 * replace-target device and excludes seed devices. 301 */ 302 u64 num_devices; 303 304 /* 305 * The number of devices that successfully opened, including 306 * replace-target, excludes seed devices. 307 */ 308 u64 open_devices; 309 310 /* The number of devices that are under the chunk allocation list. */ 311 u64 rw_devices; 312 313 /* Count of missing devices under this fsid excluding seed device. */ 314 u64 missing_devices; 315 u64 total_rw_bytes; 316 317 /* 318 * Count of devices from btrfs_super_block::num_devices for this fsid, 319 * which includes the seed device, excludes the transient replace-target 320 * device. 321 */ 322 u64 total_devices; 323 324 /* Highest generation number of seen devices */ 325 u64 latest_generation; 326 327 /* 328 * The mount device or a device with highest generation after removal 329 * or replace. 330 */ 331 struct btrfs_device *latest_dev; 332 333 /* all of the devices in the FS, protected by a mutex 334 * so we can safely walk it to write out the supers without 335 * worrying about add/remove by the multi-device code. 336 * Scrubbing super can kick off supers writing by holding 337 * this mutex lock. 338 */ 339 struct mutex device_list_mutex; 340 341 /* List of all devices, protected by device_list_mutex */ 342 struct list_head devices; 343 344 /* 345 * Devices which can satisfy space allocation. Protected by 346 * chunk_mutex 347 */ 348 struct list_head alloc_list; 349 350 struct list_head seed_list; 351 bool seeding; 352 353 int opened; 354 355 /* set when we find or add a device that doesn't have the 356 * nonrot flag set 357 */ 358 bool rotating; 359 /* Devices support TRIM/discard commands */ 360 bool discardable; 361 362 struct btrfs_fs_info *fs_info; 363 /* sysfs kobjects */ 364 struct kobject fsid_kobj; 365 struct kobject *devices_kobj; 366 struct kobject *devinfo_kobj; 367 struct completion kobj_unregister; 368 369 enum btrfs_chunk_allocation_policy chunk_alloc_policy; 370 371 /* Policy used to read the mirrored stripes */ 372 enum btrfs_read_policy read_policy; 373 }; 374 375 #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \ 376 - sizeof(struct btrfs_chunk)) \ 377 / sizeof(struct btrfs_stripe) + 1) 378 379 #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ 380 - 2 * sizeof(struct btrfs_disk_key) \ 381 - 2 * sizeof(struct btrfs_chunk)) \ 382 / sizeof(struct btrfs_stripe) + 1) 383 384 struct btrfs_io_stripe { 385 struct btrfs_device *dev; 386 union { 387 /* Block mapping */ 388 u64 physical; 389 /* For the endio handler */ 390 struct btrfs_io_context *bioc; 391 }; 392 }; 393 394 struct btrfs_discard_stripe { 395 struct btrfs_device *dev; 396 u64 physical; 397 u64 length; 398 }; 399 400 /* 401 * Context for IO subsmission for device stripe. 402 * 403 * - Track the unfinished mirrors for mirror based profiles 404 * Mirror based profiles are SINGLE/DUP/RAID1/RAID10. 405 * 406 * - Contain the logical -> physical mapping info 407 * Used by submit_stripe_bio() for mapping logical bio 408 * into physical device address. 409 * 410 * - Contain device replace info 411 * Used by handle_ops_on_dev_replace() to copy logical bios 412 * into the new device. 413 * 414 * - Contain RAID56 full stripe logical bytenrs 415 */ 416 struct btrfs_io_context { 417 refcount_t refs; 418 struct btrfs_fs_info *fs_info; 419 u64 map_type; /* get from map_lookup->type */ 420 struct bio *orig_bio; 421 atomic_t error; 422 int max_errors; 423 int num_stripes; 424 int mirror_num; 425 int num_tgtdevs; 426 int *tgtdev_map; 427 /* 428 * logical block numbers for the start of each stripe 429 * The last one or two are p/q. These are sorted, 430 * so raid_map[0] is the start of our full stripe 431 */ 432 u64 *raid_map; 433 struct btrfs_io_stripe stripes[]; 434 }; 435 436 struct btrfs_device_info { 437 struct btrfs_device *dev; 438 u64 dev_offset; 439 u64 max_avail; 440 u64 total_avail; 441 }; 442 443 struct btrfs_raid_attr { 444 u8 sub_stripes; /* sub_stripes info for map */ 445 u8 dev_stripes; /* stripes per dev */ 446 u8 devs_max; /* max devs to use */ 447 u8 devs_min; /* min devs needed */ 448 u8 tolerated_failures; /* max tolerated fail devs */ 449 u8 devs_increment; /* ndevs has to be a multiple of this */ 450 u8 ncopies; /* how many copies to data has */ 451 u8 nparity; /* number of stripes worth of bytes to store 452 * parity information */ 453 u8 mindev_error; /* error code if min devs requisite is unmet */ 454 const char raid_name[8]; /* name of the raid */ 455 u64 bg_flag; /* block group flag of the raid */ 456 }; 457 458 extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES]; 459 460 struct map_lookup { 461 u64 type; 462 int io_align; 463 int io_width; 464 u32 stripe_len; 465 int num_stripes; 466 int sub_stripes; 467 int verified_stripes; /* For mount time dev extent verification */ 468 struct btrfs_io_stripe stripes[]; 469 }; 470 471 #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 472 (sizeof(struct btrfs_io_stripe) * (n))) 473 474 struct btrfs_balance_args; 475 struct btrfs_balance_progress; 476 struct btrfs_balance_control { 477 struct btrfs_balance_args data; 478 struct btrfs_balance_args meta; 479 struct btrfs_balance_args sys; 480 481 u64 flags; 482 483 struct btrfs_balance_progress stat; 484 }; 485 486 /* 487 * Search for a given device by the set parameters 488 */ 489 struct btrfs_dev_lookup_args { 490 u64 devid; 491 u8 *uuid; 492 u8 *fsid; 493 bool missing; 494 }; 495 496 /* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */ 497 #define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 } 498 499 #define BTRFS_DEV_LOOKUP_ARGS(name) \ 500 struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT 501 502 enum btrfs_map_op { 503 BTRFS_MAP_READ, 504 BTRFS_MAP_WRITE, 505 BTRFS_MAP_DISCARD, 506 BTRFS_MAP_GET_READ_MIRRORS, 507 }; 508 509 static inline enum btrfs_map_op btrfs_op(struct bio *bio) 510 { 511 switch (bio_op(bio)) { 512 case REQ_OP_DISCARD: 513 return BTRFS_MAP_DISCARD; 514 case REQ_OP_WRITE: 515 case REQ_OP_ZONE_APPEND: 516 return BTRFS_MAP_WRITE; 517 default: 518 WARN_ON_ONCE(1); 519 fallthrough; 520 case REQ_OP_READ: 521 return BTRFS_MAP_READ; 522 } 523 } 524 525 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 526 { 527 ASSERT(num_stripes); 528 return sizeof(struct btrfs_chunk) + 529 sizeof(struct btrfs_stripe) * (num_stripes - 1); 530 } 531 532 void btrfs_get_bioc(struct btrfs_io_context *bioc); 533 void btrfs_put_bioc(struct btrfs_io_context *bioc); 534 int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, 535 u64 logical, u64 *length, 536 struct btrfs_io_context **bioc_ret, int mirror_num); 537 int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, 538 u64 logical, u64 *length, 539 struct btrfs_io_context **bioc_ret); 540 int __btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, 541 u64 logical, u64 *length, 542 struct btrfs_io_context **bioc_ret, 543 struct btrfs_io_stripe *smap, int *mirror_num_ret, 544 int need_raid_map); 545 struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info, 546 u64 logical, u64 *length_ret, 547 u32 *num_stripes); 548 int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map, 549 enum btrfs_map_op op, u64 logical, 550 struct btrfs_io_geometry *io_geom); 551 int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); 552 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); 553 struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans, 554 u64 type); 555 void btrfs_mapping_tree_free(struct extent_map_tree *tree); 556 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 557 fmode_t flags, void *holder); 558 struct btrfs_device *btrfs_scan_one_device(const char *path, 559 fmode_t flags, void *holder); 560 int btrfs_forget_devices(dev_t devt); 561 void btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 562 void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices); 563 void btrfs_assign_next_active_device(struct btrfs_device *device, 564 struct btrfs_device *this_dev); 565 struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, 566 u64 devid, 567 const char *devpath); 568 int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info, 569 struct btrfs_dev_lookup_args *args, 570 const char *path); 571 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, 572 const u64 *devid, const u8 *uuid, 573 const char *path); 574 void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args); 575 void btrfs_free_device(struct btrfs_device *device); 576 int btrfs_rm_device(struct btrfs_fs_info *fs_info, 577 struct btrfs_dev_lookup_args *args, 578 struct block_device **bdev, fmode_t *mode); 579 void __exit btrfs_cleanup_fs_uuids(void); 580 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len); 581 int btrfs_grow_device(struct btrfs_trans_handle *trans, 582 struct btrfs_device *device, u64 new_size); 583 struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices, 584 const struct btrfs_dev_lookup_args *args); 585 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 586 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path); 587 int btrfs_balance(struct btrfs_fs_info *fs_info, 588 struct btrfs_balance_control *bctl, 589 struct btrfs_ioctl_balance_args *bargs); 590 void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf); 591 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); 592 int btrfs_recover_balance(struct btrfs_fs_info *fs_info); 593 int btrfs_pause_balance(struct btrfs_fs_info *fs_info); 594 int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset); 595 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); 596 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); 597 int btrfs_uuid_scan_kthread(void *data); 598 bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset); 599 int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, 600 u64 *start, u64 *max_avail); 601 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); 602 int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info, 603 struct btrfs_ioctl_get_dev_stats *stats); 604 int btrfs_init_devices_late(struct btrfs_fs_info *fs_info); 605 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); 606 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans); 607 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev); 608 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev); 609 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev); 610 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, 611 u64 logical, u64 len); 612 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, 613 u64 logical); 614 u64 btrfs_calc_stripe_length(const struct extent_map *em); 615 int btrfs_nr_parity_stripes(u64 type); 616 int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans, 617 struct btrfs_block_group *bg); 618 int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset); 619 struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info, 620 u64 logical, u64 length); 621 void btrfs_release_disk_super(struct btrfs_super_block *super); 622 623 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, 624 int index) 625 { 626 atomic_inc(dev->dev_stat_values + index); 627 /* 628 * This memory barrier orders stores updating statistics before stores 629 * updating dev_stats_ccnt. 630 * 631 * It pairs with smp_rmb() in btrfs_run_dev_stats(). 632 */ 633 smp_mb__before_atomic(); 634 atomic_inc(&dev->dev_stats_ccnt); 635 } 636 637 static inline int btrfs_dev_stat_read(struct btrfs_device *dev, 638 int index) 639 { 640 return atomic_read(dev->dev_stat_values + index); 641 } 642 643 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev, 644 int index) 645 { 646 int ret; 647 648 ret = atomic_xchg(dev->dev_stat_values + index, 0); 649 /* 650 * atomic_xchg implies a full memory barriers as per atomic_t.txt: 651 * - RMW operations that have a return value are fully ordered; 652 * 653 * This implicit memory barriers is paired with the smp_rmb in 654 * btrfs_run_dev_stats 655 */ 656 atomic_inc(&dev->dev_stats_ccnt); 657 return ret; 658 } 659 660 static inline void btrfs_dev_stat_set(struct btrfs_device *dev, 661 int index, unsigned long val) 662 { 663 atomic_set(dev->dev_stat_values + index, val); 664 /* 665 * This memory barrier orders stores updating statistics before stores 666 * updating dev_stats_ccnt. 667 * 668 * It pairs with smp_rmb() in btrfs_run_dev_stats(). 669 */ 670 smp_mb__before_atomic(); 671 atomic_inc(&dev->dev_stats_ccnt); 672 } 673 674 static inline const char *btrfs_dev_name(const struct btrfs_device *device) 675 { 676 if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) 677 return "<missing disk>"; 678 else 679 return rcu_str_deref(device->name); 680 } 681 682 void btrfs_commit_device_sizes(struct btrfs_transaction *trans); 683 684 struct list_head * __attribute_const__ btrfs_get_fs_uuids(void); 685 bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info, 686 struct btrfs_device *failing_dev); 687 void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, 688 struct block_device *bdev, 689 const char *device_path); 690 691 enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags); 692 int btrfs_bg_type_to_factor(u64 flags); 693 const char *btrfs_bg_type_to_raid_name(u64 flags); 694 int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info); 695 bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical); 696 697 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr); 698 699 #endif 700