1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef BTRFS_FS_H 4 #define BTRFS_FS_H 5 6 #include <crypto/blake2b.h> 7 #include <crypto/sha2.h> 8 #include <linux/blkdev.h> 9 #include <linux/sizes.h> 10 #include <linux/time64.h> 11 #include <linux/compiler.h> 12 #include <linux/math.h> 13 #include <linux/atomic.h> 14 #include <linux/percpu_counter.h> 15 #include <linux/completion.h> 16 #include <linux/lockdep.h> 17 #include <linux/spinlock.h> 18 #include <linux/mutex.h> 19 #include <linux/rwsem.h> 20 #include <linux/semaphore.h> 21 #include <linux/list.h> 22 #include <linux/pagemap.h> 23 #include <linux/radix-tree.h> 24 #include <linux/workqueue.h> 25 #include <linux/wait.h> 26 #include <linux/wait_bit.h> 27 #include <linux/sched.h> 28 #include <linux/rbtree.h> 29 #include <linux/xxhash.h> 30 #include <linux/fserror.h> 31 #include <uapi/linux/btrfs.h> 32 #include <uapi/linux/btrfs_tree.h> 33 #include "extent-io-tree.h" 34 #include "async-thread.h" 35 #include "block-rsv.h" 36 #include "messages.h" 37 38 struct inode; 39 struct super_block; 40 struct kobject; 41 struct reloc_control; 42 struct ulist; 43 struct btrfs_device; 44 struct btrfs_block_group; 45 struct btrfs_root; 46 struct btrfs_fs_devices; 47 struct btrfs_transaction; 48 struct btrfs_balance_control; 49 struct btrfs_subpage_info; 50 struct btrfs_stripe_hash_table; 51 struct btrfs_space_info; 52 53 /* Minimum data and metadata block size. */ 54 #define BTRFS_MIN_BLOCKSIZE (SZ_4K) 55 #define BTRFS_MAX_BLOCKSIZE (SZ_64K) 56 57 /* The maximum folio size btrfs supports. */ 58 #define BTRFS_MAX_FOLIO_SIZE (SZ_2M) 59 static_assert(BTRFS_MAX_FOLIO_SIZE > PAGE_SIZE); 60 61 /* 62 * The maximum number of blocks a huge folio can support. 63 * 64 * Depending on the filesystem block size, the real maximum blocks per folio 65 * may also be limited by the above BTRFS_MAX_FOLIO_SIZE. 66 */ 67 #ifdef CONFIG_BTRFS_EXPERIMENTAL 68 #define BTRFS_MAX_BLOCKS_PER_FOLIO (512) 69 #else 70 #define BTRFS_MAX_BLOCKS_PER_FOLIO (BITS_PER_LONG) 71 #endif 72 73 #define BTRFS_MAX_EXTENT_SIZE SZ_128M 74 75 /* 76 * Maximum length to trim in a single iteration to avoid holding device list 77 * mutex for too long. 78 */ 79 #define BTRFS_MAX_TRIM_LENGTH SZ_2G 80 81 #define BTRFS_OLDEST_GENERATION 0ULL 82 83 #define BTRFS_EMPTY_DIR_SIZE 0 84 85 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M 86 87 #define BTRFS_SUPER_INFO_OFFSET SZ_64K 88 #define BTRFS_SUPER_INFO_SIZE 4096 89 static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE); 90 91 /* Array of bytes with variable length, hexadecimal format 0x1234 */ 92 #define BTRFS_CSUM_FMT "0x%*phN" 93 #define BTRFS_CSUM_FMT_VALUE(size, bytes) size, bytes 94 95 #define BTRFS_KEY_FMT "(%llu %u %llu)" 96 #define BTRFS_KEY_FMT_VALUE(key) (key)->objectid, (key)->type, (key)->offset 97 98 #define BTRFS_QGROUP_FMT "%hu/%llu" 99 #define BTRFS_QGROUP_FMT_VALUE(qgroup) btrfs_qgroup_level((qgroup)->qgroupid), \ 100 btrfs_qgroup_subvolid((qgroup)->qgroupid) 101 102 /* 103 * Number of metadata items necessary for an unlink operation: 104 * 105 * 1 for the possible orphan item 106 * 1 for the dir item 107 * 1 for the dir index 108 * 1 for the inode ref 109 * 1 for the inode 110 * 1 for the parent inode 111 */ 112 #define BTRFS_UNLINK_METADATA_UNITS 6 113 114 /* 115 * The reserved space at the beginning of each device. It covers the primary 116 * super block and leaves space for potential use by other tools like 117 * bootloaders or to lower potential damage of accidental overwrite. 118 */ 119 #define BTRFS_DEVICE_RANGE_RESERVED (SZ_1M) 120 /* 121 * Runtime (in-memory) states of filesystem 122 */ 123 enum { 124 /* 125 * Filesystem is being remounted, allow to skip some operations, like 126 * defrag 127 */ 128 BTRFS_FS_STATE_REMOUNTING, 129 /* Filesystem in RO mode */ 130 BTRFS_FS_STATE_RO, 131 /* Track if a transaction abort has been reported on this filesystem */ 132 BTRFS_FS_STATE_TRANS_ABORTED, 133 /* Track if log replay has failed. */ 134 BTRFS_FS_STATE_LOG_REPLAY_ABORTED, 135 /* 136 * Bio operations should be blocked on this filesystem because a source 137 * or target device is being destroyed as part of a device replace 138 */ 139 BTRFS_FS_STATE_DEV_REPLACING, 140 /* The btrfs_fs_info created for self-tests */ 141 BTRFS_FS_STATE_DUMMY_FS_INFO, 142 143 /* Checksum errors are ignored. */ 144 BTRFS_FS_STATE_NO_DATA_CSUMS, 145 BTRFS_FS_STATE_SKIP_META_CSUMS, 146 147 /* Indicates there was an error cleaning up a log tree. */ 148 BTRFS_FS_STATE_LOG_CLEANUP_ERROR, 149 150 /* No more delayed iput can be queued. */ 151 BTRFS_FS_STATE_NO_DELAYED_IPUT, 152 153 /* 154 * Emergency shutdown, a step further than transaction aborted by 155 * rejecting all operations. 156 */ 157 BTRFS_FS_STATE_EMERGENCY_SHUTDOWN, 158 159 BTRFS_FS_STATE_COUNT 160 }; 161 162 enum { 163 BTRFS_FS_CLOSING_START, 164 BTRFS_FS_CLOSING_DONE, 165 BTRFS_FS_LOG_RECOVERING, 166 BTRFS_FS_OPEN, 167 BTRFS_FS_QUOTA_ENABLED, 168 BTRFS_FS_SQUOTA_ENABLING, 169 BTRFS_FS_UPDATE_UUID_TREE_GEN, 170 BTRFS_FS_CREATING_FREE_SPACE_TREE, 171 BTRFS_FS_BTREE_ERR, 172 BTRFS_FS_LOG1_ERR, 173 BTRFS_FS_LOG2_ERR, 174 BTRFS_FS_QUOTA_OVERRIDE, 175 /* Used to record internally whether fs has been frozen */ 176 BTRFS_FS_FROZEN, 177 /* 178 * Indicate that balance has been set up from the ioctl and is in the 179 * main phase. The fs_info::balance_ctl is initialized. 180 */ 181 BTRFS_FS_BALANCE_RUNNING, 182 183 /* 184 * Indicate that relocation of a chunk has started, it's set per chunk 185 * and is toggled between chunks. 186 */ 187 BTRFS_FS_RELOC_RUNNING, 188 189 /* Indicate that the cleaner thread is awake and doing something. */ 190 BTRFS_FS_CLEANER_RUNNING, 191 192 /* 193 * The checksumming has an optimized version and is considered fast, 194 * so we don't need to offload checksums to workqueues. 195 */ 196 BTRFS_FS_CSUM_IMPL_FAST, 197 198 /* Indicate that the discard workqueue can service discards. */ 199 BTRFS_FS_DISCARD_RUNNING, 200 201 /* Indicate that we need to cleanup space cache v1 */ 202 BTRFS_FS_CLEANUP_SPACE_CACHE_V1, 203 204 /* Indicate that we can't trust the free space tree for caching yet */ 205 BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, 206 207 /* Indicate whether there are any tree modification log users */ 208 BTRFS_FS_TREE_MOD_LOG_USERS, 209 210 /* Indicate that we want the transaction kthread to commit right now. */ 211 BTRFS_FS_COMMIT_TRANS, 212 213 /* Indicate we have half completed snapshot deletions pending. */ 214 BTRFS_FS_UNFINISHED_DROPS, 215 216 /* Indicate we have to finish a zone to do next allocation. */ 217 BTRFS_FS_NEED_ZONE_FINISH, 218 219 /* Indicate that we want to commit the transaction. */ 220 BTRFS_FS_NEED_TRANS_COMMIT, 221 222 /* This is set when active zone tracking is needed. */ 223 BTRFS_FS_ACTIVE_ZONE_TRACKING, 224 225 /* 226 * Indicate if we have some features changed, this is mostly for 227 * cleaner thread to update the sysfs interface. 228 */ 229 BTRFS_FS_FEATURE_CHANGED, 230 231 /* 232 * Indicate that we have found a tree block which is only aligned to 233 * sectorsize, but not to nodesize. This should be rare nowadays. 234 */ 235 BTRFS_FS_UNALIGNED_TREE_BLOCK, 236 237 #if BITS_PER_LONG == 32 238 /* Indicate if we have error/warn message printed on 32bit systems */ 239 BTRFS_FS_32BIT_ERROR, 240 BTRFS_FS_32BIT_WARN, 241 #endif 242 }; 243 244 /* 245 * Flags for mount options. 246 * 247 * Note: don't forget to add new options to btrfs_show_options() 248 */ 249 enum { 250 BTRFS_MOUNT_NODATASUM = (1ULL << 0), 251 BTRFS_MOUNT_NODATACOW = (1ULL << 1), 252 BTRFS_MOUNT_NOBARRIER = (1ULL << 2), 253 BTRFS_MOUNT_SSD = (1ULL << 3), 254 BTRFS_MOUNT_DEGRADED = (1ULL << 4), 255 BTRFS_MOUNT_COMPRESS = (1ULL << 5), 256 BTRFS_MOUNT_NOTREELOG = (1ULL << 6), 257 BTRFS_MOUNT_FLUSHONCOMMIT = (1ULL << 7), 258 BTRFS_MOUNT_SSD_SPREAD = (1ULL << 8), 259 BTRFS_MOUNT_NOSSD = (1ULL << 9), 260 BTRFS_MOUNT_DISCARD_SYNC = (1ULL << 10), 261 BTRFS_MOUNT_FORCE_COMPRESS = (1ULL << 11), 262 BTRFS_MOUNT_SPACE_CACHE = (1ULL << 12), 263 BTRFS_MOUNT_CLEAR_CACHE = (1ULL << 13), 264 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1ULL << 14), 265 BTRFS_MOUNT_ENOSPC_DEBUG = (1ULL << 15), 266 BTRFS_MOUNT_AUTO_DEFRAG = (1ULL << 16), 267 BTRFS_MOUNT_USEBACKUPROOT = (1ULL << 17), 268 BTRFS_MOUNT_SKIP_BALANCE = (1ULL << 18), 269 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1ULL << 19), 270 BTRFS_MOUNT_RESCAN_UUID_TREE = (1ULL << 20), 271 BTRFS_MOUNT_FRAGMENT_DATA = (1ULL << 21), 272 BTRFS_MOUNT_FRAGMENT_METADATA = (1ULL << 22), 273 BTRFS_MOUNT_FREE_SPACE_TREE = (1ULL << 23), 274 BTRFS_MOUNT_NOLOGREPLAY = (1ULL << 24), 275 BTRFS_MOUNT_REF_VERIFY = (1ULL << 25), 276 BTRFS_MOUNT_DISCARD_ASYNC = (1ULL << 26), 277 BTRFS_MOUNT_IGNOREBADROOTS = (1ULL << 27), 278 BTRFS_MOUNT_IGNOREDATACSUMS = (1ULL << 28), 279 BTRFS_MOUNT_NODISCARD = (1ULL << 29), 280 BTRFS_MOUNT_NOSPACECACHE = (1ULL << 30), 281 BTRFS_MOUNT_IGNOREMETACSUMS = (1ULL << 31), 282 BTRFS_MOUNT_IGNORESUPERFLAGS = (1ULL << 32), 283 BTRFS_MOUNT_REF_TRACKER = (1ULL << 33), 284 }; 285 286 /* These mount options require a full read-only fs, no new transaction is allowed. */ 287 #define BTRFS_MOUNT_FULL_RO_MASK \ 288 (BTRFS_MOUNT_NOLOGREPLAY | \ 289 BTRFS_MOUNT_IGNOREBADROOTS | \ 290 BTRFS_MOUNT_IGNOREDATACSUMS | \ 291 BTRFS_MOUNT_IGNOREMETACSUMS | \ 292 BTRFS_MOUNT_IGNORESUPERFLAGS | \ 293 BTRFS_MOUNT_USEBACKUPROOT) 294 295 /* 296 * Compat flags that we support. If any incompat flags are set other than the 297 * ones specified below then we will fail to mount 298 */ 299 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL 300 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL 301 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL 302 303 #define BTRFS_FEATURE_COMPAT_RO_SUPP \ 304 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \ 305 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \ 306 BTRFS_FEATURE_COMPAT_RO_VERITY | \ 307 BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE) 308 309 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL 310 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL 311 312 #define BTRFS_FEATURE_INCOMPAT_SUPP_STABLE \ 313 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \ 314 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \ 315 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \ 316 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \ 317 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \ 318 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \ 319 BTRFS_FEATURE_INCOMPAT_RAID56 | \ 320 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \ 321 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \ 322 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \ 323 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \ 324 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \ 325 BTRFS_FEATURE_INCOMPAT_ZONED | \ 326 BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA) 327 328 #ifdef CONFIG_BTRFS_EXPERIMENTAL 329 /* 330 * Features under development like Extent tree v2 support is enabled 331 * only under CONFIG_BTRFS_EXPERIMENTAL 332 */ 333 #define BTRFS_FEATURE_INCOMPAT_SUPP \ 334 (BTRFS_FEATURE_INCOMPAT_SUPP_STABLE | \ 335 BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE | \ 336 BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2 | \ 337 BTRFS_FEATURE_INCOMPAT_REMAP_TREE) 338 339 #else 340 341 #define BTRFS_FEATURE_INCOMPAT_SUPP \ 342 (BTRFS_FEATURE_INCOMPAT_SUPP_STABLE) 343 344 #endif 345 346 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \ 347 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF) 348 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL 349 350 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) 351 #define BTRFS_WARNING_COMMIT_INTERVAL (300) 352 #define BTRFS_DEFAULT_MAX_INLINE (2048) 353 354 enum btrfs_compression_type { 355 BTRFS_COMPRESS_NONE = 0, 356 BTRFS_COMPRESS_ZLIB = 1, 357 BTRFS_COMPRESS_LZO = 2, 358 BTRFS_COMPRESS_ZSTD = 3, 359 BTRFS_NR_COMPRESS_TYPES = 4, 360 361 BTRFS_DEFRAG_DONT_COMPRESS, 362 }; 363 364 struct btrfs_dev_replace { 365 /* See #define above */ 366 u64 replace_state; 367 /* Seconds since 1-Jan-1970 */ 368 time64_t time_started; 369 /* Seconds since 1-Jan-1970 */ 370 time64_t time_stopped; 371 atomic64_t num_write_errors; 372 atomic64_t num_uncorrectable_read_errors; 373 374 u64 cursor_left; 375 u64 committed_cursor_left; 376 u64 cursor_left_last_write_of_item; 377 u64 cursor_right; 378 379 /* See #define above */ 380 u64 cont_reading_from_srcdev_mode; 381 382 int is_valid; 383 int item_needs_writeback; 384 struct btrfs_device *srcdev; 385 struct btrfs_device *tgtdev; 386 387 struct mutex lock_finishing_cancel_unmount; 388 struct rw_semaphore rwsem; 389 390 struct btrfs_scrub_progress scrub_progress; 391 392 struct percpu_counter bio_counter; 393 wait_queue_head_t replace_wait; 394 395 struct task_struct *replace_task; 396 }; 397 398 /* 399 * Free clusters are used to claim free space in relatively large chunks, 400 * allowing us to do less seeky writes. They are used for all metadata 401 * allocations. In ssd_spread mode they are also used for data allocations. 402 */ 403 struct btrfs_free_cluster { 404 spinlock_t lock; 405 spinlock_t refill_lock; 406 struct rb_root root; 407 408 /* Largest extent in this cluster */ 409 u64 max_size; 410 411 /* First extent starting offset */ 412 u64 window_start; 413 414 /* We did a full search and couldn't create a cluster */ 415 bool fragmented; 416 417 struct btrfs_block_group *block_group; 418 /* 419 * When a cluster is allocated from a block group, we put the cluster 420 * onto a list in the block group so that it can be freed before the 421 * block group is freed. 422 */ 423 struct list_head block_group_list; 424 }; 425 426 /* Discard control. */ 427 /* 428 * Async discard uses multiple lists to differentiate the discard filter 429 * parameters. Index 0 is for completely free block groups where we need to 430 * ensure the entire block group is trimmed without being lossy. Indices 431 * afterwards represent monotonically decreasing discard filter sizes to 432 * prioritize what should be discarded next. 433 */ 434 #define BTRFS_NR_DISCARD_LISTS 3 435 #define BTRFS_DISCARD_INDEX_UNUSED 0 436 #define BTRFS_DISCARD_INDEX_START 1 437 438 struct btrfs_discard_ctl { 439 struct workqueue_struct *discard_workers; 440 struct delayed_work work; 441 spinlock_t lock; 442 struct btrfs_block_group *block_group; 443 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS]; 444 u64 prev_discard; 445 u64 prev_discard_time; 446 atomic_t discardable_extents; 447 atomic64_t discardable_bytes; 448 u64 max_discard_size; 449 u64 delay_ms; 450 u32 iops_limit; 451 u32 kbps_limit; 452 u64 discard_extent_bytes; 453 u64 discard_bitmap_bytes; 454 atomic64_t discard_bytes_saved; 455 }; 456 457 /* 458 * Exclusive operations (device replace, resize, device add/remove, balance) 459 */ 460 enum btrfs_exclusive_operation { 461 BTRFS_EXCLOP_NONE, 462 BTRFS_EXCLOP_BALANCE_PAUSED, 463 BTRFS_EXCLOP_BALANCE, 464 BTRFS_EXCLOP_DEV_ADD, 465 BTRFS_EXCLOP_DEV_REMOVE, 466 BTRFS_EXCLOP_DEV_REPLACE, 467 BTRFS_EXCLOP_RESIZE, 468 BTRFS_EXCLOP_SWAP_ACTIVATE, 469 }; 470 471 /* Store data about transaction commits, exported via sysfs. */ 472 struct btrfs_commit_stats { 473 /* Total number of commits */ 474 u64 commit_count; 475 /* The maximum commit duration so far in ns */ 476 u64 max_commit_dur; 477 /* The last commit duration in ns */ 478 u64 last_commit_dur; 479 /* The total commit duration in ns */ 480 u64 total_commit_dur; 481 /* Start of the last critical section in ns. */ 482 u64 critical_section_start_time; 483 }; 484 485 struct btrfs_delayed_root { 486 spinlock_t lock; 487 int nodes; /* for delayed nodes */ 488 struct list_head node_list; 489 /* 490 * Used for delayed nodes which is waiting to be dealt with by the 491 * worker. If the delayed node is inserted into the work queue, we 492 * drop it from this list. 493 */ 494 struct list_head prepare_list; 495 atomic_t items; /* for delayed items */ 496 atomic_t items_seq; /* for delayed items */ 497 wait_queue_head_t wait; 498 }; 499 500 struct btrfs_free_space_ctl; 501 struct btrfs_free_space; 502 503 struct btrfs_fs_info { 504 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 505 unsigned long flags; 506 struct btrfs_root *tree_root; 507 struct btrfs_root *chunk_root; 508 struct btrfs_root *dev_root; 509 struct btrfs_root *fs_root; 510 struct btrfs_root *quota_root; 511 struct btrfs_root *uuid_root; 512 struct btrfs_root *data_reloc_root; 513 struct btrfs_root *block_group_root; 514 struct btrfs_root *stripe_root; 515 struct btrfs_root *remap_root; 516 517 /* The log root tree is a directory of all the other log roots */ 518 struct btrfs_root *log_root_tree; 519 520 /* The tree that holds the global roots (csum, extent, etc) */ 521 rwlock_t global_root_lock; 522 struct rb_root global_root_tree; 523 524 spinlock_t fs_roots_radix_lock; 525 struct radix_tree_root fs_roots_radix; 526 527 /* Block group cache stuff */ 528 rwlock_t block_group_cache_lock; 529 struct rb_root_cached block_group_cache_tree; 530 531 /* Keep track of unallocated space */ 532 atomic64_t free_chunk_space; 533 534 /* Track ranges which are used by log trees blocks/logged data extents */ 535 struct extent_io_tree excluded_extents; 536 537 /* logical->physical extent mapping */ 538 struct rb_root_cached mapping_tree; 539 rwlock_t mapping_tree_lock; 540 541 /* 542 * Block reservation for extent, checksum, root tree and delayed dir 543 * index item. 544 */ 545 struct btrfs_block_rsv global_block_rsv; 546 /* Block reservation for metadata operations */ 547 struct btrfs_block_rsv trans_block_rsv; 548 /* Block reservation for chunk tree */ 549 struct btrfs_block_rsv chunk_block_rsv; 550 /* Block reservation for remap tree. */ 551 struct btrfs_block_rsv remap_block_rsv; 552 /* Block reservation for delayed operations */ 553 struct btrfs_block_rsv delayed_block_rsv; 554 /* Block reservation for delayed refs */ 555 struct btrfs_block_rsv delayed_refs_rsv; 556 /* Block reservation for treelog tree */ 557 struct btrfs_block_rsv treelog_rsv; 558 559 struct btrfs_block_rsv empty_block_rsv; 560 561 /* 562 * Updated while holding the lock 'trans_lock'. Due to the life cycle of 563 * a transaction, it can be directly read while holding a transaction 564 * handle, everywhere else must be read with btrfs_get_fs_generation(). 565 * Should always be updated using btrfs_set_fs_generation(). 566 */ 567 u64 generation; 568 /* 569 * Always use btrfs_get_last_trans_committed() and 570 * btrfs_set_last_trans_committed() to read and update this field. 571 */ 572 u64 last_trans_committed; 573 /* 574 * Generation of the last transaction used for block group relocation 575 * since the filesystem was last mounted (or 0 if none happened yet). 576 * Must be written and read while holding btrfs_fs_info::commit_root_sem. 577 */ 578 u64 last_reloc_trans; 579 580 /* 581 * This is updated to the current trans every time a full commit is 582 * required instead of the faster short fsync log commits 583 */ 584 u64 last_trans_log_full_commit; 585 unsigned long long mount_opt; 586 587 /* Compress related structures. */ 588 void *compr_wsm[BTRFS_NR_COMPRESS_TYPES]; 589 590 int compress_type; 591 int compress_level; 592 u32 commit_interval; 593 /* 594 * It is a suggestive number, the read side is safe even it gets a 595 * wrong number because we will write out the data into a regular 596 * extent. The write side(mount/remount) is under ->s_umount lock, 597 * so it is also safe. 598 */ 599 u64 max_inline; 600 601 struct btrfs_transaction *running_transaction; 602 wait_queue_head_t transaction_throttle; 603 wait_queue_head_t transaction_wait; 604 wait_queue_head_t transaction_blocked_wait; 605 wait_queue_head_t async_submit_wait; 606 607 /* 608 * Used to protect the incompat_flags, compat_flags, compat_ro_flags 609 * when they are updated. 610 * 611 * Because we do not clear the flags for ever, so we needn't use 612 * the lock on the read side. 613 * 614 * We also needn't use the lock when we mount the fs, because 615 * there is no other task which will update the flag. 616 */ 617 spinlock_t super_lock; 618 struct btrfs_super_block *super_copy; 619 struct btrfs_super_block *super_for_commit; 620 struct super_block *sb; 621 struct inode *btree_inode; 622 struct mutex tree_log_mutex; 623 struct mutex transaction_kthread_mutex; 624 struct mutex cleaner_mutex; 625 struct mutex chunk_mutex; 626 struct mutex remap_mutex; 627 628 /* 629 * This is taken to make sure we don't set block groups ro after the 630 * free space cache has been allocated on them. 631 */ 632 struct mutex ro_block_group_mutex; 633 634 /* 635 * This is used during read/modify/write to make sure no two ios are 636 * trying to mod the same stripe at the same time. 637 */ 638 struct btrfs_stripe_hash_table *stripe_hash_table; 639 640 /* 641 * This protects the ordered operations list only while we are 642 * processing all of the entries on it. This way we make sure the 643 * commit code doesn't find the list temporarily empty because another 644 * function happens to be doing non-waiting preflush before jumping 645 * into the main commit. 646 */ 647 struct mutex ordered_operations_mutex; 648 649 struct rw_semaphore commit_root_sem; 650 651 struct rw_semaphore cleanup_work_sem; 652 653 struct rw_semaphore subvol_sem; 654 655 spinlock_t trans_lock; 656 /* 657 * The reloc mutex goes with the trans lock, it is taken during commit 658 * to protect us from the relocation code. 659 */ 660 struct mutex reloc_mutex; 661 /* Protects setting, clearing and getting fs_info->reloc_ctl. */ 662 spinlock_t reloc_ctl_lock; 663 664 struct list_head trans_list; 665 struct list_head dead_roots; 666 struct list_head caching_block_groups; 667 668 spinlock_t delayed_iput_lock; 669 struct list_head delayed_iputs; 670 atomic_t nr_delayed_iputs; 671 wait_queue_head_t delayed_iputs_wait; 672 673 atomic64_t tree_mod_seq; 674 675 /* This protects tree_mod_log and tree_mod_seq_list */ 676 rwlock_t tree_mod_log_lock; 677 struct rb_root tree_mod_log; 678 struct list_head tree_mod_seq_list; 679 680 atomic_t async_delalloc_pages; 681 682 /* This is used to protect the following list -- ordered_roots. */ 683 spinlock_t ordered_root_lock; 684 685 /* 686 * All fs/file tree roots in which there are data=ordered extents 687 * pending writeback are added into this list. 688 * 689 * These can span multiple transactions and basically include every 690 * dirty data page that isn't from nodatacow. 691 */ 692 struct list_head ordered_roots; 693 694 struct mutex delalloc_root_mutex; 695 spinlock_t delalloc_root_lock; 696 /* All fs/file tree roots that have delalloc inodes. */ 697 struct list_head delalloc_roots; 698 699 /* 700 * There is a pool of worker threads for checksumming during writes and 701 * a pool for checksumming after reads. This is because readers can 702 * run with FS locks held, and the writers may be waiting for those 703 * locks. We don't want ordering in the pending list to cause 704 * deadlocks, and so the two are serviced separately. 705 * 706 * A third pool does submit_bio to avoid deadlocking with the other two. 707 */ 708 struct btrfs_workqueue *workers; 709 struct btrfs_workqueue *delalloc_workers; 710 struct btrfs_workqueue *flush_workers; 711 struct workqueue_struct *endio_workers; 712 struct workqueue_struct *endio_meta_workers; 713 struct workqueue_struct *rmw_workers; 714 struct btrfs_workqueue *endio_write_workers; 715 struct btrfs_workqueue *endio_freespace_worker; 716 struct btrfs_workqueue *caching_workers; 717 718 struct workqueue_struct *fixup_workers; 719 struct btrfs_workqueue *delayed_workers; 720 721 struct task_struct *transaction_kthread; 722 struct task_struct *cleaner_kthread; 723 u32 thread_pool_size; 724 725 struct kobject *space_info_kobj; 726 struct kobject *qgroups_kobj; 727 struct kobject *discard_kobj; 728 729 /* Track the number of blocks (sectors) read by the filesystem. */ 730 struct percpu_counter stats_read_blocks; 731 732 /* Used to keep from writing metadata until there is a nice batch */ 733 struct percpu_counter dirty_metadata_bytes; 734 struct percpu_counter delalloc_bytes; 735 struct percpu_counter ordered_bytes; 736 s32 dirty_metadata_batch; 737 s32 delalloc_batch; 738 739 struct percpu_counter evictable_extent_maps; 740 u64 em_shrinker_last_root; 741 u64 em_shrinker_last_ino; 742 atomic64_t em_shrinker_nr_to_scan; 743 struct work_struct em_shrinker_work; 744 745 /* Protected by 'trans_lock'. */ 746 struct list_head dirty_cowonly_roots; 747 748 struct btrfs_fs_devices *fs_devices; 749 750 /* 751 * The space_info list is effectively read only after initial setup. 752 * It is populated at mount time and cleaned up after all block groups 753 * are removed. RCU is used to protect it. 754 */ 755 struct list_head space_info; 756 757 struct btrfs_space_info *data_sinfo; 758 759 struct reloc_control *reloc_ctl; 760 761 /* data_alloc_cluster is only used in ssd_spread mode */ 762 struct btrfs_free_cluster data_alloc_cluster; 763 764 /* All metadata allocations go through this cluster. */ 765 struct btrfs_free_cluster meta_alloc_cluster; 766 767 /* Auto defrag inodes go here. */ 768 spinlock_t defrag_inodes_lock; 769 struct rb_root defrag_inodes; 770 atomic_t defrag_running; 771 772 /* Used to protect avail_{data, metadata, system}_alloc_bits */ 773 seqlock_t profiles_lock; 774 /* 775 * These three are in extended format (availability of single chunks is 776 * denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other types are denoted 777 * by corresponding BTRFS_BLOCK_GROUP_* bits) 778 */ 779 u64 avail_data_alloc_bits; 780 u64 avail_metadata_alloc_bits; 781 u64 avail_system_alloc_bits; 782 783 /* Balance state */ 784 spinlock_t balance_lock; 785 struct mutex balance_mutex; 786 atomic_t balance_pause_req; 787 atomic_t balance_cancel_req; 788 struct btrfs_balance_control *balance_ctl; 789 wait_queue_head_t balance_wait_q; 790 791 /* Cancellation requests for chunk relocation */ 792 atomic_t reloc_cancel_req; 793 794 u32 data_chunk_allocations; 795 u32 metadata_ratio; 796 797 /* Private scrub information */ 798 struct mutex scrub_lock; 799 atomic_t scrubs_running; 800 atomic_t scrub_pause_req; 801 atomic_t scrubs_paused; 802 atomic_t scrub_cancel_req; 803 wait_queue_head_t scrub_pause_wait; 804 /* 805 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not 806 * running. 807 */ 808 refcount_t scrub_workers_refcnt; 809 struct workqueue_struct *scrub_workers; 810 811 struct btrfs_discard_ctl discard_ctl; 812 813 /* Is qgroup tracking in a consistent state? */ 814 unsigned long qgroup_flags; 815 816 /* Holds configuration and tracking. Protected by qgroup_lock. */ 817 struct rb_root qgroup_tree; 818 spinlock_t qgroup_lock; 819 820 /* 821 * Protect user change for quota operations. If a transaction is needed, 822 * it must be started before locking this lock. 823 */ 824 struct mutex qgroup_ioctl_lock; 825 826 /* List of dirty qgroups to be written at next commit. */ 827 struct list_head dirty_qgroups; 828 829 /* Used by qgroup for an efficient tree traversal. */ 830 u64 qgroup_seq; 831 832 /* Qgroup rescan items. */ 833 /* Protects the progress item */ 834 struct mutex qgroup_rescan_lock; 835 struct btrfs_key qgroup_rescan_progress; 836 struct btrfs_workqueue *qgroup_rescan_workers; 837 struct completion qgroup_rescan_completion; 838 struct btrfs_work qgroup_rescan_work; 839 /* Protected by qgroup_rescan_lock */ 840 bool qgroup_rescan_running; 841 u8 qgroup_drop_subtree_thres; 842 u64 qgroup_enable_gen; 843 844 /* 845 * If this is not 0, then it indicates a serious filesystem error has 846 * happened and it contains that error (negative errno value). 847 */ 848 int fs_error; 849 850 /* Filesystem state */ 851 unsigned long fs_state; 852 853 struct btrfs_delayed_root delayed_root; 854 855 /* Entries are eb->start >> nodesize_bits */ 856 struct xarray buffer_tree; 857 858 /* Next backup root to be overwritten */ 859 int backup_root_index; 860 int use_backup_slot; 861 862 /* Device replace state */ 863 struct btrfs_dev_replace dev_replace; 864 865 struct semaphore uuid_tree_rescan_sem; 866 867 /* Used to reclaim the metadata space in the background. */ 868 struct work_struct async_reclaim_work; 869 struct work_struct async_data_reclaim_work; 870 struct work_struct preempt_reclaim_work; 871 872 /* Reclaim partially filled block groups in the background */ 873 struct work_struct reclaim_bgs_work; 874 /* Protected by unused_bgs_lock. */ 875 struct list_head reclaim_bgs; 876 int bg_reclaim_threshold; 877 878 /* Protects the lists unused_bgs, reclaim_bgs, and fully_remapped_bgs. */ 879 spinlock_t unused_bgs_lock; 880 /* Protected by unused_bgs_lock. */ 881 struct list_head unused_bgs; 882 struct list_head fully_remapped_bgs; 883 struct mutex unused_bg_unpin_mutex; 884 /* Protect block groups that are going to be deleted */ 885 struct mutex reclaim_bgs_lock; 886 887 /* Cached block sizes */ 888 u32 nodesize; 889 u32 nodesize_bits; 890 u32 sectorsize; 891 /* ilog2 of sectorsize, use to avoid 64bit division */ 892 u32 sectorsize_bits; 893 u32 block_min_order; 894 u32 block_max_order; 895 u32 writeback_bio_size; 896 u32 csum_size; 897 u32 csums_per_leaf; 898 u32 csum_type; 899 900 /* 901 * Maximum size of an extent. BTRFS_MAX_EXTENT_SIZE on regular 902 * filesystem, on zoned it depends on the device constraints. 903 */ 904 u64 max_extent_size; 905 906 /* Block groups and devices containing active swapfiles. */ 907 spinlock_t swapfile_pins_lock; 908 struct rb_root swapfile_pins; 909 910 /* Type of exclusive operation running, protected by super_lock */ 911 enum btrfs_exclusive_operation exclusive_operation; 912 913 /* 914 * Zone size > 0 when in ZONED mode, otherwise it's used for a check 915 * if the mode is enabled 916 */ 917 u64 zone_size; 918 919 /* Constraints for ZONE_APPEND commands: */ 920 struct queue_limits limits; 921 u64 max_zone_append_size; 922 923 struct mutex zoned_meta_io_lock; 924 spinlock_t treelog_bg_lock; 925 u64 treelog_bg; 926 927 /* 928 * Start of the dedicated data relocation block group, protected by 929 * relocation_bg_lock. 930 */ 931 spinlock_t relocation_bg_lock; 932 u64 data_reloc_bg; 933 struct mutex zoned_data_reloc_io_lock; 934 935 struct btrfs_block_group *active_meta_bg; 936 struct btrfs_block_group *active_system_bg; 937 938 u64 nr_global_roots; 939 940 spinlock_t zone_active_bgs_lock; 941 struct list_head zone_active_bgs; 942 943 /* Updates are not protected by any lock */ 944 struct btrfs_commit_stats commit_stats; 945 946 /* 947 * Last generation where we dropped a non-relocation root. 948 * Use btrfs_set_last_root_drop_gen() and btrfs_get_last_root_drop_gen() 949 * to change it and to read it, respectively. 950 */ 951 u64 last_root_drop_gen; 952 953 /* 954 * Annotations for transaction events (structures are empty when 955 * compiled without lockdep). 956 */ 957 struct lockdep_map btrfs_trans_num_writers_map; 958 struct lockdep_map btrfs_trans_num_extwriters_map; 959 struct lockdep_map btrfs_state_change_map[4]; 960 struct lockdep_map btrfs_trans_pending_ordered_map; 961 struct lockdep_map btrfs_ordered_extent_map; 962 963 #ifdef CONFIG_BTRFS_DEBUG 964 spinlock_t ref_verify_lock; 965 struct rb_root block_tree; 966 967 struct kobject *debug_kobj; 968 struct list_head allocated_roots; 969 970 spinlock_t eb_leak_lock; 971 struct list_head allocated_ebs; 972 #endif 973 974 /* Used by self tests only. */ 975 bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl, 976 struct btrfs_free_space *info); 977 }; 978 979 #define folio_to_inode(_folio) (BTRFS_I(_Generic((_folio), \ 980 struct folio *: (_folio))->mapping->host)) 981 982 #define folio_to_fs_info(_folio) (folio_to_inode(_folio)->root->fs_info) 983 984 #define inode_to_fs_info(_inode) (BTRFS_I(_Generic((_inode), \ 985 struct inode *: (_inode)))->root->fs_info) 986 987 static inline gfp_t btrfs_alloc_write_mask(const struct address_space *mapping) 988 { 989 return mapping_gfp_constraint(mapping, ~__GFP_FS); 990 } 991 992 /* Return the minimal folio size of the fs. */ 993 static inline unsigned int btrfs_min_folio_size(const struct btrfs_fs_info *fs_info) 994 { 995 return 1U << (PAGE_SHIFT + fs_info->block_min_order); 996 } 997 998 static inline u64 btrfs_get_fs_generation(const struct btrfs_fs_info *fs_info) 999 { 1000 return READ_ONCE(fs_info->generation); 1001 } 1002 1003 static inline void btrfs_set_fs_generation(struct btrfs_fs_info *fs_info, u64 gen) 1004 { 1005 WRITE_ONCE(fs_info->generation, gen); 1006 } 1007 1008 static inline u64 btrfs_get_last_trans_committed(const struct btrfs_fs_info *fs_info) 1009 { 1010 return READ_ONCE(fs_info->last_trans_committed); 1011 } 1012 1013 static inline void btrfs_set_last_trans_committed(struct btrfs_fs_info *fs_info, u64 gen) 1014 { 1015 WRITE_ONCE(fs_info->last_trans_committed, gen); 1016 } 1017 1018 static inline void btrfs_set_last_root_drop_gen(struct btrfs_fs_info *fs_info, 1019 u64 gen) 1020 { 1021 WRITE_ONCE(fs_info->last_root_drop_gen, gen); 1022 } 1023 1024 static inline u64 btrfs_get_last_root_drop_gen(const struct btrfs_fs_info *fs_info) 1025 { 1026 return READ_ONCE(fs_info->last_root_drop_gen); 1027 } 1028 1029 /* 1030 * Take the number of bytes to be checksummed and figure out how many leaves 1031 * it would require to store the csums for that many bytes. 1032 */ 1033 static inline u64 btrfs_csum_bytes_to_leaves( 1034 const struct btrfs_fs_info *fs_info, u64 csum_bytes) 1035 { 1036 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits; 1037 1038 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf); 1039 } 1040 1041 /* 1042 * Use this if we would be adding new items, as we could split nodes as we cow 1043 * down the tree. 1044 */ 1045 static inline u64 btrfs_calc_insert_metadata_size(const struct btrfs_fs_info *fs_info, 1046 unsigned num_items) 1047 { 1048 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items; 1049 } 1050 1051 /* 1052 * Doing a truncate or a modification won't result in new nodes or leaves, just 1053 * what we need for COW. 1054 */ 1055 static inline u64 btrfs_calc_metadata_size(const struct btrfs_fs_info *fs_info, 1056 unsigned num_items) 1057 { 1058 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items; 1059 } 1060 1061 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \ 1062 sizeof(struct btrfs_item)) 1063 1064 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info) 1065 { 1066 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && fs_info->zone_size > 0; 1067 } 1068 1069 /* 1070 * Count how many fs_info->max_extent_size cover the @size 1071 */ 1072 static inline u32 count_max_extents(const struct btrfs_fs_info *fs_info, u64 size) 1073 { 1074 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 1075 if (!fs_info) 1076 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE); 1077 #endif 1078 1079 return div_u64(size + fs_info->max_extent_size - 1, fs_info->max_extent_size); 1080 } 1081 1082 static inline unsigned int btrfs_blocks_per_folio(const struct btrfs_fs_info *fs_info, 1083 const struct folio *folio) 1084 { 1085 return folio_size(folio) >> fs_info->sectorsize_bits; 1086 } 1087 1088 bool __attribute_const__ btrfs_supported_blocksize(u32 blocksize); 1089 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 1090 enum btrfs_exclusive_operation type); 1091 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 1092 enum btrfs_exclusive_operation type); 1093 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info); 1094 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info); 1095 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, 1096 enum btrfs_exclusive_operation op); 1097 1098 int btrfs_check_ioctl_vol_args_path(const struct btrfs_ioctl_vol_args *vol_args); 1099 1100 u16 btrfs_csum_type_size(u16 type); 1101 int btrfs_super_csum_size(const struct btrfs_super_block *s); 1102 const char *btrfs_super_csum_name(u16 csum_type); 1103 size_t __attribute_const__ btrfs_get_num_csums(void); 1104 struct btrfs_csum_ctx { 1105 u16 csum_type; 1106 union { 1107 u32 crc32; 1108 struct xxh64_state xxh64; 1109 struct sha256_ctx sha256; 1110 struct blake2b_ctx blake2b; 1111 }; 1112 }; 1113 void btrfs_csum(u16 csum_type, const u8 *data, size_t len, u8 *out); 1114 void btrfs_csum_init(struct btrfs_csum_ctx *ctx, u16 csum_type); 1115 void btrfs_csum_update(struct btrfs_csum_ctx *ctx, const u8 *data, size_t len); 1116 void btrfs_csum_final(struct btrfs_csum_ctx *ctx, u8 *out); 1117 1118 static inline bool btrfs_is_empty_uuid(const u8 *uuid) 1119 { 1120 return uuid_is_null((const uuid_t *)uuid); 1121 } 1122 1123 /* Compatibility and incompatibility defines */ 1124 void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag, 1125 const char *name); 1126 void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag, 1127 const char *name); 1128 void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag, 1129 const char *name); 1130 void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag, 1131 const char *name); 1132 1133 #define __btrfs_fs_incompat(fs_info, flags) \ 1134 (!!(btrfs_super_incompat_flags((fs_info)->super_copy) & (flags))) 1135 1136 #define __btrfs_fs_compat_ro(fs_info, flags) \ 1137 (!!(btrfs_super_compat_ro_flags((fs_info)->super_copy) & (flags))) 1138 1139 #define btrfs_set_fs_incompat(__fs_info, opt) \ 1140 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt) 1141 1142 #define btrfs_clear_fs_incompat(__fs_info, opt) \ 1143 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt) 1144 1145 #define btrfs_fs_incompat(fs_info, opt) \ 1146 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 1147 1148 #define btrfs_set_fs_compat_ro(__fs_info, opt) \ 1149 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt) 1150 1151 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \ 1152 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt) 1153 1154 #define btrfs_fs_compat_ro(fs_info, opt) \ 1155 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 1156 1157 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1158 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1159 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt) 1160 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \ 1161 BTRFS_MOUNT_##opt) 1162 1163 static inline bool btrfs_is_full_ro(const struct btrfs_fs_info *fs_info) 1164 { 1165 if (!sb_rdonly(fs_info->sb)) 1166 return false; 1167 if (unlikely(fs_info->mount_opt & BTRFS_MOUNT_FULL_RO_MASK)) 1168 return true; 1169 return false; 1170 } 1171 1172 static inline bool btrfs_fs_closing(const struct btrfs_fs_info *fs_info) 1173 { 1174 return unlikely(test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)); 1175 } 1176 1177 static inline bool btrfs_fs_closing_done(const struct btrfs_fs_info *fs_info) 1178 { 1179 if (btrfs_fs_closing(fs_info) && test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags)) 1180 return true; 1181 1182 return false; 1183 } 1184 1185 /* 1186 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do 1187 * anything except sleeping. This function is used to check the status of 1188 * the fs. 1189 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount, 1190 * since setting and checking for SB_RDONLY in the superblock's flags is not 1191 * atomic. 1192 */ 1193 static inline int btrfs_need_cleaner_sleep(const struct btrfs_fs_info *fs_info) 1194 { 1195 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) || 1196 btrfs_fs_closing(fs_info); 1197 } 1198 1199 static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info) 1200 { 1201 clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags); 1202 } 1203 1204 /* 1205 * We use the folio owner_2 flag to indicate the folio has blocks that were 1206 * dirtied without a space reservation and need the writepage fixup before 1207 * writeback. For bs < folio_size the fixup bitmap tracks the affected 1208 * blocks. 1209 */ 1210 #define folio_test_fixup_pending(folio) folio_test_owner_2(folio) 1211 #define folio_set_fixup_pending(folio) folio_set_owner_2(folio) 1212 #define folio_clear_fixup_pending(folio) folio_clear_owner_2(folio) 1213 1214 #define BTRFS_FS_ERROR(fs_info) (READ_ONCE((fs_info)->fs_error)) 1215 1216 #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \ 1217 (unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \ 1218 &(fs_info)->fs_state))) 1219 1220 static inline bool btrfs_is_shutdown(const struct btrfs_fs_info *fs_info) 1221 { 1222 return unlikely(test_bit(BTRFS_FS_STATE_EMERGENCY_SHUTDOWN, &fs_info->fs_state)); 1223 } 1224 1225 static inline void btrfs_force_shutdown(struct btrfs_fs_info *fs_info) 1226 { 1227 /* 1228 * Here we do not want to use handle_fs_error(), which will mark the fs 1229 * read-only. 1230 * Some call sites like shutdown ioctl will mark the fs shutdown when 1231 * the fs is frozen. But thaw path will handle RO and RW fs 1232 * differently. 1233 * 1234 * So here we only mark the fs error without flipping it RO. 1235 */ 1236 WRITE_ONCE(fs_info->fs_error, -EIO); 1237 if (!test_and_set_bit(BTRFS_FS_STATE_EMERGENCY_SHUTDOWN, &fs_info->fs_state)) { 1238 btrfs_crit(fs_info, "emergency shutdown"); 1239 fserror_report_shutdown(fs_info->sb, GFP_KERNEL); 1240 } 1241 } 1242 1243 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 1244 1245 #define EXPORT_FOR_TESTS 1246 1247 static inline bool btrfs_is_testing(const struct btrfs_fs_info *fs_info) 1248 { 1249 return unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)); 1250 } 1251 1252 void btrfs_test_destroy_inode(struct inode *inode); 1253 1254 #else 1255 1256 #define EXPORT_FOR_TESTS static 1257 1258 static inline bool btrfs_is_testing(const struct btrfs_fs_info *fs_info) 1259 { 1260 return false; 1261 } 1262 #endif 1263 1264 #endif 1265