1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #ifndef BTRFS_CTREE_H 7 #define BTRFS_CTREE_H 8 9 #include <linux/mm.h> 10 #include <linux/sched/signal.h> 11 #include <linux/highmem.h> 12 #include <linux/fs.h> 13 #include <linux/rwsem.h> 14 #include <linux/semaphore.h> 15 #include <linux/completion.h> 16 #include <linux/backing-dev.h> 17 #include <linux/wait.h> 18 #include <linux/slab.h> 19 #include <trace/events/btrfs.h> 20 #include <asm/kmap_types.h> 21 #include <asm/unaligned.h> 22 #include <linux/pagemap.h> 23 #include <linux/btrfs.h> 24 #include <linux/btrfs_tree.h> 25 #include <linux/workqueue.h> 26 #include <linux/security.h> 27 #include <linux/sizes.h> 28 #include <linux/dynamic_debug.h> 29 #include <linux/refcount.h> 30 #include <linux/crc32c.h> 31 #include "extent-io-tree.h" 32 #include "extent_io.h" 33 #include "extent_map.h" 34 #include "async-thread.h" 35 #include "block-rsv.h" 36 #include "locking.h" 37 38 struct btrfs_trans_handle; 39 struct btrfs_transaction; 40 struct btrfs_pending_snapshot; 41 struct btrfs_delayed_ref_root; 42 struct btrfs_space_info; 43 struct btrfs_block_group; 44 extern struct kmem_cache *btrfs_trans_handle_cachep; 45 extern struct kmem_cache *btrfs_bit_radix_cachep; 46 extern struct kmem_cache *btrfs_path_cachep; 47 extern struct kmem_cache *btrfs_free_space_cachep; 48 extern struct kmem_cache *btrfs_free_space_bitmap_cachep; 49 struct btrfs_ordered_sum; 50 struct btrfs_ref; 51 52 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */ 53 54 /* 55 * Maximum number of mirrors that can be available for all profiles counting 56 * the target device of dev-replace as one. During an active device replace 57 * procedure, the target device of the copy operation is a mirror for the 58 * filesystem data as well that can be used to read data in order to repair 59 * read errors on other disks. 60 * 61 * Current value is derived from RAID1C4 with 4 copies. 62 */ 63 #define BTRFS_MAX_MIRRORS (4 + 1) 64 65 #define BTRFS_MAX_LEVEL 8 66 67 #define BTRFS_OLDEST_GENERATION 0ULL 68 69 /* 70 * the max metadata block size. This limit is somewhat artificial, 71 * but the memmove costs go through the roof for larger blocks. 72 */ 73 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536 74 75 /* 76 * we can actually store much bigger names, but lets not confuse the rest 77 * of linux 78 */ 79 #define BTRFS_NAME_LEN 255 80 81 /* 82 * Theoretical limit is larger, but we keep this down to a sane 83 * value. That should limit greatly the possibility of collisions on 84 * inode ref items. 85 */ 86 #define BTRFS_LINK_MAX 65535U 87 88 #define BTRFS_EMPTY_DIR_SIZE 0 89 90 /* ioprio of readahead is set to idle */ 91 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)) 92 93 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M 94 95 /* 96 * Use large batch size to reduce overhead of metadata updates. On the reader 97 * side, we only read it when we are close to ENOSPC and the read overhead is 98 * mostly related to the number of CPUs, so it is OK to use arbitrary large 99 * value here. 100 */ 101 #define BTRFS_TOTAL_BYTES_PINNED_BATCH SZ_128M 102 103 #define BTRFS_MAX_EXTENT_SIZE SZ_128M 104 105 /* 106 * Deltas are an effective way to populate global statistics. Give macro names 107 * to make it clear what we're doing. An example is discard_extents in 108 * btrfs_free_space_ctl. 109 */ 110 #define BTRFS_STAT_NR_ENTRIES 2 111 #define BTRFS_STAT_CURR 0 112 #define BTRFS_STAT_PREV 1 113 114 /* 115 * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size 116 */ 117 static inline u32 count_max_extents(u64 size) 118 { 119 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE); 120 } 121 122 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 123 { 124 BUG_ON(num_stripes == 0); 125 return sizeof(struct btrfs_chunk) + 126 sizeof(struct btrfs_stripe) * (num_stripes - 1); 127 } 128 129 /* 130 * Runtime (in-memory) states of filesystem 131 */ 132 enum { 133 /* Global indicator of serious filesystem errors */ 134 BTRFS_FS_STATE_ERROR, 135 /* 136 * Filesystem is being remounted, allow to skip some operations, like 137 * defrag 138 */ 139 BTRFS_FS_STATE_REMOUNTING, 140 /* Track if a transaction abort has been reported on this filesystem */ 141 BTRFS_FS_STATE_TRANS_ABORTED, 142 /* 143 * Bio operations should be blocked on this filesystem because a source 144 * or target device is being destroyed as part of a device replace 145 */ 146 BTRFS_FS_STATE_DEV_REPLACING, 147 /* The btrfs_fs_info created for self-tests */ 148 BTRFS_FS_STATE_DUMMY_FS_INFO, 149 }; 150 151 #define BTRFS_BACKREF_REV_MAX 256 152 #define BTRFS_BACKREF_REV_SHIFT 56 153 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \ 154 BTRFS_BACKREF_REV_SHIFT) 155 156 #define BTRFS_OLD_BACKREF_REV 0 157 #define BTRFS_MIXED_BACKREF_REV 1 158 159 /* 160 * every tree block (leaf or node) starts with this header. 161 */ 162 struct btrfs_header { 163 /* these first four must match the super block */ 164 u8 csum[BTRFS_CSUM_SIZE]; 165 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 166 __le64 bytenr; /* which block this node is supposed to live in */ 167 __le64 flags; 168 169 /* allowed to be different from the super from here on down */ 170 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 171 __le64 generation; 172 __le64 owner; 173 __le32 nritems; 174 u8 level; 175 } __attribute__ ((__packed__)); 176 177 /* 178 * this is a very generous portion of the super block, giving us 179 * room to translate 14 chunks with 3 stripes each. 180 */ 181 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 182 183 /* 184 * just in case we somehow lose the roots and are not able to mount, 185 * we store an array of the roots from previous transactions 186 * in the super. 187 */ 188 #define BTRFS_NUM_BACKUP_ROOTS 4 189 struct btrfs_root_backup { 190 __le64 tree_root; 191 __le64 tree_root_gen; 192 193 __le64 chunk_root; 194 __le64 chunk_root_gen; 195 196 __le64 extent_root; 197 __le64 extent_root_gen; 198 199 __le64 fs_root; 200 __le64 fs_root_gen; 201 202 __le64 dev_root; 203 __le64 dev_root_gen; 204 205 __le64 csum_root; 206 __le64 csum_root_gen; 207 208 __le64 total_bytes; 209 __le64 bytes_used; 210 __le64 num_devices; 211 /* future */ 212 __le64 unused_64[4]; 213 214 u8 tree_root_level; 215 u8 chunk_root_level; 216 u8 extent_root_level; 217 u8 fs_root_level; 218 u8 dev_root_level; 219 u8 csum_root_level; 220 /* future and to align */ 221 u8 unused_8[10]; 222 } __attribute__ ((__packed__)); 223 224 /* 225 * the super block basically lists the main trees of the FS 226 * it currently lacks any block count etc etc 227 */ 228 struct btrfs_super_block { 229 /* the first 4 fields must match struct btrfs_header */ 230 u8 csum[BTRFS_CSUM_SIZE]; 231 /* FS specific UUID, visible to user */ 232 u8 fsid[BTRFS_FSID_SIZE]; 233 __le64 bytenr; /* this block number */ 234 __le64 flags; 235 236 /* allowed to be different from the btrfs_header from here own down */ 237 __le64 magic; 238 __le64 generation; 239 __le64 root; 240 __le64 chunk_root; 241 __le64 log_root; 242 243 /* this will help find the new super based on the log root */ 244 __le64 log_root_transid; 245 __le64 total_bytes; 246 __le64 bytes_used; 247 __le64 root_dir_objectid; 248 __le64 num_devices; 249 __le32 sectorsize; 250 __le32 nodesize; 251 __le32 __unused_leafsize; 252 __le32 stripesize; 253 __le32 sys_chunk_array_size; 254 __le64 chunk_root_generation; 255 __le64 compat_flags; 256 __le64 compat_ro_flags; 257 __le64 incompat_flags; 258 __le16 csum_type; 259 u8 root_level; 260 u8 chunk_root_level; 261 u8 log_root_level; 262 struct btrfs_dev_item dev_item; 263 264 char label[BTRFS_LABEL_SIZE]; 265 266 __le64 cache_generation; 267 __le64 uuid_tree_generation; 268 269 /* the UUID written into btree blocks */ 270 u8 metadata_uuid[BTRFS_FSID_SIZE]; 271 272 /* future expansion */ 273 __le64 reserved[28]; 274 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; 275 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS]; 276 } __attribute__ ((__packed__)); 277 278 /* 279 * Compat flags that we support. If any incompat flags are set other than the 280 * ones specified below then we will fail to mount 281 */ 282 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL 283 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL 284 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL 285 286 #define BTRFS_FEATURE_COMPAT_RO_SUPP \ 287 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \ 288 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID) 289 290 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL 291 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL 292 293 #define BTRFS_FEATURE_INCOMPAT_SUPP \ 294 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \ 295 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \ 296 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \ 297 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \ 298 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \ 299 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \ 300 BTRFS_FEATURE_INCOMPAT_RAID56 | \ 301 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \ 302 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \ 303 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \ 304 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \ 305 BTRFS_FEATURE_INCOMPAT_RAID1C34) 306 307 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \ 308 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF) 309 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL 310 311 /* 312 * A leaf is full of items. offset and size tell us where to find 313 * the item in the leaf (relative to the start of the data area) 314 */ 315 struct btrfs_item { 316 struct btrfs_disk_key key; 317 __le32 offset; 318 __le32 size; 319 } __attribute__ ((__packed__)); 320 321 /* 322 * leaves have an item area and a data area: 323 * [item0, item1....itemN] [free space] [dataN...data1, data0] 324 * 325 * The data is separate from the items to get the keys closer together 326 * during searches. 327 */ 328 struct btrfs_leaf { 329 struct btrfs_header header; 330 struct btrfs_item items[]; 331 } __attribute__ ((__packed__)); 332 333 /* 334 * all non-leaf blocks are nodes, they hold only keys and pointers to 335 * other blocks 336 */ 337 struct btrfs_key_ptr { 338 struct btrfs_disk_key key; 339 __le64 blockptr; 340 __le64 generation; 341 } __attribute__ ((__packed__)); 342 343 struct btrfs_node { 344 struct btrfs_header header; 345 struct btrfs_key_ptr ptrs[]; 346 } __attribute__ ((__packed__)); 347 348 /* 349 * btrfs_paths remember the path taken from the root down to the leaf. 350 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point 351 * to any other levels that are present. 352 * 353 * The slots array records the index of the item or block pointer 354 * used while walking the tree. 355 */ 356 enum { READA_NONE, READA_BACK, READA_FORWARD }; 357 struct btrfs_path { 358 struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; 359 int slots[BTRFS_MAX_LEVEL]; 360 /* if there is real range locking, this locks field will change */ 361 u8 locks[BTRFS_MAX_LEVEL]; 362 u8 reada; 363 /* keep some upper locks as we walk down */ 364 u8 lowest_level; 365 366 /* 367 * set by btrfs_split_item, tells search_slot to keep all locks 368 * and to force calls to keep space in the nodes 369 */ 370 unsigned int search_for_split:1; 371 unsigned int keep_locks:1; 372 unsigned int skip_locking:1; 373 unsigned int leave_spinning:1; 374 unsigned int search_commit_root:1; 375 unsigned int need_commit_sem:1; 376 unsigned int skip_release_on_error:1; 377 unsigned int recurse:1; 378 }; 379 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \ 380 sizeof(struct btrfs_item)) 381 struct btrfs_dev_replace { 382 u64 replace_state; /* see #define above */ 383 time64_t time_started; /* seconds since 1-Jan-1970 */ 384 time64_t time_stopped; /* seconds since 1-Jan-1970 */ 385 atomic64_t num_write_errors; 386 atomic64_t num_uncorrectable_read_errors; 387 388 u64 cursor_left; 389 u64 committed_cursor_left; 390 u64 cursor_left_last_write_of_item; 391 u64 cursor_right; 392 393 u64 cont_reading_from_srcdev_mode; /* see #define above */ 394 395 int is_valid; 396 int item_needs_writeback; 397 struct btrfs_device *srcdev; 398 struct btrfs_device *tgtdev; 399 400 struct mutex lock_finishing_cancel_unmount; 401 struct rw_semaphore rwsem; 402 403 struct btrfs_scrub_progress scrub_progress; 404 405 struct percpu_counter bio_counter; 406 wait_queue_head_t replace_wait; 407 }; 408 409 /* 410 * free clusters are used to claim free space in relatively large chunks, 411 * allowing us to do less seeky writes. They are used for all metadata 412 * allocations. In ssd_spread mode they are also used for data allocations. 413 */ 414 struct btrfs_free_cluster { 415 spinlock_t lock; 416 spinlock_t refill_lock; 417 struct rb_root root; 418 419 /* largest extent in this cluster */ 420 u64 max_size; 421 422 /* first extent starting offset */ 423 u64 window_start; 424 425 /* We did a full search and couldn't create a cluster */ 426 bool fragmented; 427 428 struct btrfs_block_group *block_group; 429 /* 430 * when a cluster is allocated from a block group, we put the 431 * cluster onto a list in the block group so that it can 432 * be freed before the block group is freed. 433 */ 434 struct list_head block_group_list; 435 }; 436 437 enum btrfs_caching_type { 438 BTRFS_CACHE_NO, 439 BTRFS_CACHE_STARTED, 440 BTRFS_CACHE_FAST, 441 BTRFS_CACHE_FINISHED, 442 BTRFS_CACHE_ERROR, 443 }; 444 445 /* 446 * Tree to record all locked full stripes of a RAID5/6 block group 447 */ 448 struct btrfs_full_stripe_locks_tree { 449 struct rb_root root; 450 struct mutex lock; 451 }; 452 453 /* Discard control. */ 454 /* 455 * Async discard uses multiple lists to differentiate the discard filter 456 * parameters. Index 0 is for completely free block groups where we need to 457 * ensure the entire block group is trimmed without being lossy. Indices 458 * afterwards represent monotonically decreasing discard filter sizes to 459 * prioritize what should be discarded next. 460 */ 461 #define BTRFS_NR_DISCARD_LISTS 3 462 #define BTRFS_DISCARD_INDEX_UNUSED 0 463 #define BTRFS_DISCARD_INDEX_START 1 464 465 struct btrfs_discard_ctl { 466 struct workqueue_struct *discard_workers; 467 struct delayed_work work; 468 spinlock_t lock; 469 struct btrfs_block_group *block_group; 470 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS]; 471 u64 prev_discard; 472 atomic_t discardable_extents; 473 atomic64_t discardable_bytes; 474 u64 max_discard_size; 475 unsigned long delay; 476 u32 iops_limit; 477 u32 kbps_limit; 478 u64 discard_extent_bytes; 479 u64 discard_bitmap_bytes; 480 atomic64_t discard_bytes_saved; 481 }; 482 483 /* delayed seq elem */ 484 struct seq_list { 485 struct list_head list; 486 u64 seq; 487 }; 488 489 #define SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 } 490 491 #define SEQ_LAST ((u64)-1) 492 493 enum btrfs_orphan_cleanup_state { 494 ORPHAN_CLEANUP_STARTED = 1, 495 ORPHAN_CLEANUP_DONE = 2, 496 }; 497 498 void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info); 499 500 /* fs_info */ 501 struct reloc_control; 502 struct btrfs_device; 503 struct btrfs_fs_devices; 504 struct btrfs_balance_control; 505 struct btrfs_delayed_root; 506 507 /* 508 * Block group or device which contains an active swapfile. Used for preventing 509 * unsafe operations while a swapfile is active. 510 * 511 * These are sorted on (ptr, inode) (note that a block group or device can 512 * contain more than one swapfile). We compare the pointer values because we 513 * don't actually care what the object is, we just need a quick check whether 514 * the object exists in the rbtree. 515 */ 516 struct btrfs_swapfile_pin { 517 struct rb_node node; 518 void *ptr; 519 struct inode *inode; 520 /* 521 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr 522 * points to a struct btrfs_device. 523 */ 524 bool is_block_group; 525 }; 526 527 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr); 528 529 enum { 530 BTRFS_FS_BARRIER, 531 BTRFS_FS_CLOSING_START, 532 BTRFS_FS_CLOSING_DONE, 533 BTRFS_FS_LOG_RECOVERING, 534 BTRFS_FS_OPEN, 535 BTRFS_FS_QUOTA_ENABLED, 536 BTRFS_FS_UPDATE_UUID_TREE_GEN, 537 BTRFS_FS_CREATING_FREE_SPACE_TREE, 538 BTRFS_FS_BTREE_ERR, 539 BTRFS_FS_LOG1_ERR, 540 BTRFS_FS_LOG2_ERR, 541 BTRFS_FS_QUOTA_OVERRIDE, 542 /* Used to record internally whether fs has been frozen */ 543 BTRFS_FS_FROZEN, 544 /* 545 * Indicate that balance has been set up from the ioctl and is in the 546 * main phase. The fs_info::balance_ctl is initialized. 547 * Set and cleared while holding fs_info::balance_mutex. 548 */ 549 BTRFS_FS_BALANCE_RUNNING, 550 551 /* Indicate that the cleaner thread is awake and doing something. */ 552 BTRFS_FS_CLEANER_RUNNING, 553 554 /* 555 * The checksumming has an optimized version and is considered fast, 556 * so we don't need to offload checksums to workqueues. 557 */ 558 BTRFS_FS_CSUM_IMPL_FAST, 559 560 /* Indicate that the discard workqueue can service discards. */ 561 BTRFS_FS_DISCARD_RUNNING, 562 }; 563 564 /* 565 * Exclusive operations (device replace, resize, device add/remove, balance) 566 */ 567 enum btrfs_exclusive_operation { 568 BTRFS_EXCLOP_NONE, 569 BTRFS_EXCLOP_BALANCE, 570 BTRFS_EXCLOP_DEV_ADD, 571 BTRFS_EXCLOP_DEV_REMOVE, 572 BTRFS_EXCLOP_DEV_REPLACE, 573 BTRFS_EXCLOP_RESIZE, 574 BTRFS_EXCLOP_SWAP_ACTIVATE, 575 }; 576 577 struct btrfs_fs_info { 578 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 579 unsigned long flags; 580 struct btrfs_root *extent_root; 581 struct btrfs_root *tree_root; 582 struct btrfs_root *chunk_root; 583 struct btrfs_root *dev_root; 584 struct btrfs_root *fs_root; 585 struct btrfs_root *csum_root; 586 struct btrfs_root *quota_root; 587 struct btrfs_root *uuid_root; 588 struct btrfs_root *free_space_root; 589 struct btrfs_root *data_reloc_root; 590 591 /* the log root tree is a directory of all the other log roots */ 592 struct btrfs_root *log_root_tree; 593 594 spinlock_t fs_roots_radix_lock; 595 struct radix_tree_root fs_roots_radix; 596 597 /* block group cache stuff */ 598 spinlock_t block_group_cache_lock; 599 u64 first_logical_byte; 600 struct rb_root block_group_cache_tree; 601 602 /* keep track of unallocated space */ 603 atomic64_t free_chunk_space; 604 605 /* Track ranges which are used by log trees blocks/logged data extents */ 606 struct extent_io_tree excluded_extents; 607 608 /* logical->physical extent mapping */ 609 struct extent_map_tree mapping_tree; 610 611 /* 612 * block reservation for extent, checksum, root tree and 613 * delayed dir index item 614 */ 615 struct btrfs_block_rsv global_block_rsv; 616 /* block reservation for metadata operations */ 617 struct btrfs_block_rsv trans_block_rsv; 618 /* block reservation for chunk tree */ 619 struct btrfs_block_rsv chunk_block_rsv; 620 /* block reservation for delayed operations */ 621 struct btrfs_block_rsv delayed_block_rsv; 622 /* block reservation for delayed refs */ 623 struct btrfs_block_rsv delayed_refs_rsv; 624 625 struct btrfs_block_rsv empty_block_rsv; 626 627 u64 generation; 628 u64 last_trans_committed; 629 u64 avg_delayed_ref_runtime; 630 631 /* 632 * this is updated to the current trans every time a full commit 633 * is required instead of the faster short fsync log commits 634 */ 635 u64 last_trans_log_full_commit; 636 unsigned long mount_opt; 637 /* 638 * Track requests for actions that need to be done during transaction 639 * commit (like for some mount options). 640 */ 641 unsigned long pending_changes; 642 unsigned long compress_type:4; 643 unsigned int compress_level; 644 u32 commit_interval; 645 /* 646 * It is a suggestive number, the read side is safe even it gets a 647 * wrong number because we will write out the data into a regular 648 * extent. The write side(mount/remount) is under ->s_umount lock, 649 * so it is also safe. 650 */ 651 u64 max_inline; 652 653 struct btrfs_transaction *running_transaction; 654 wait_queue_head_t transaction_throttle; 655 wait_queue_head_t transaction_wait; 656 wait_queue_head_t transaction_blocked_wait; 657 wait_queue_head_t async_submit_wait; 658 659 /* 660 * Used to protect the incompat_flags, compat_flags, compat_ro_flags 661 * when they are updated. 662 * 663 * Because we do not clear the flags for ever, so we needn't use 664 * the lock on the read side. 665 * 666 * We also needn't use the lock when we mount the fs, because 667 * there is no other task which will update the flag. 668 */ 669 spinlock_t super_lock; 670 struct btrfs_super_block *super_copy; 671 struct btrfs_super_block *super_for_commit; 672 struct super_block *sb; 673 struct inode *btree_inode; 674 struct mutex tree_log_mutex; 675 struct mutex transaction_kthread_mutex; 676 struct mutex cleaner_mutex; 677 struct mutex chunk_mutex; 678 679 /* 680 * this is taken to make sure we don't set block groups ro after 681 * the free space cache has been allocated on them 682 */ 683 struct mutex ro_block_group_mutex; 684 685 /* this is used during read/modify/write to make sure 686 * no two ios are trying to mod the same stripe at the same 687 * time 688 */ 689 struct btrfs_stripe_hash_table *stripe_hash_table; 690 691 /* 692 * this protects the ordered operations list only while we are 693 * processing all of the entries on it. This way we make 694 * sure the commit code doesn't find the list temporarily empty 695 * because another function happens to be doing non-waiting preflush 696 * before jumping into the main commit. 697 */ 698 struct mutex ordered_operations_mutex; 699 700 struct rw_semaphore commit_root_sem; 701 702 struct rw_semaphore cleanup_work_sem; 703 704 struct rw_semaphore subvol_sem; 705 706 spinlock_t trans_lock; 707 /* 708 * the reloc mutex goes with the trans lock, it is taken 709 * during commit to protect us from the relocation code 710 */ 711 struct mutex reloc_mutex; 712 713 struct list_head trans_list; 714 struct list_head dead_roots; 715 struct list_head caching_block_groups; 716 717 spinlock_t delayed_iput_lock; 718 struct list_head delayed_iputs; 719 atomic_t nr_delayed_iputs; 720 wait_queue_head_t delayed_iputs_wait; 721 722 atomic64_t tree_mod_seq; 723 724 /* this protects tree_mod_log and tree_mod_seq_list */ 725 rwlock_t tree_mod_log_lock; 726 struct rb_root tree_mod_log; 727 struct list_head tree_mod_seq_list; 728 729 atomic_t async_delalloc_pages; 730 731 /* 732 * this is used to protect the following list -- ordered_roots. 733 */ 734 spinlock_t ordered_root_lock; 735 736 /* 737 * all fs/file tree roots in which there are data=ordered extents 738 * pending writeback are added into this list. 739 * 740 * these can span multiple transactions and basically include 741 * every dirty data page that isn't from nodatacow 742 */ 743 struct list_head ordered_roots; 744 745 struct mutex delalloc_root_mutex; 746 spinlock_t delalloc_root_lock; 747 /* all fs/file tree roots that have delalloc inodes. */ 748 struct list_head delalloc_roots; 749 750 /* 751 * there is a pool of worker threads for checksumming during writes 752 * and a pool for checksumming after reads. This is because readers 753 * can run with FS locks held, and the writers may be waiting for 754 * those locks. We don't want ordering in the pending list to cause 755 * deadlocks, and so the two are serviced separately. 756 * 757 * A third pool does submit_bio to avoid deadlocking with the other 758 * two 759 */ 760 struct btrfs_workqueue *workers; 761 struct btrfs_workqueue *delalloc_workers; 762 struct btrfs_workqueue *flush_workers; 763 struct btrfs_workqueue *endio_workers; 764 struct btrfs_workqueue *endio_meta_workers; 765 struct btrfs_workqueue *endio_raid56_workers; 766 struct btrfs_workqueue *rmw_workers; 767 struct btrfs_workqueue *endio_meta_write_workers; 768 struct btrfs_workqueue *endio_write_workers; 769 struct btrfs_workqueue *endio_freespace_worker; 770 struct btrfs_workqueue *caching_workers; 771 struct btrfs_workqueue *readahead_workers; 772 773 /* 774 * fixup workers take dirty pages that didn't properly go through 775 * the cow mechanism and make them safe to write. It happens 776 * for the sys_munmap function call path 777 */ 778 struct btrfs_workqueue *fixup_workers; 779 struct btrfs_workqueue *delayed_workers; 780 781 struct task_struct *transaction_kthread; 782 struct task_struct *cleaner_kthread; 783 u32 thread_pool_size; 784 785 struct kobject *space_info_kobj; 786 struct kobject *qgroups_kobj; 787 788 u64 total_pinned; 789 790 /* used to keep from writing metadata until there is a nice batch */ 791 struct percpu_counter dirty_metadata_bytes; 792 struct percpu_counter delalloc_bytes; 793 struct percpu_counter dio_bytes; 794 s32 dirty_metadata_batch; 795 s32 delalloc_batch; 796 797 struct list_head dirty_cowonly_roots; 798 799 struct btrfs_fs_devices *fs_devices; 800 801 /* 802 * The space_info list is effectively read only after initial 803 * setup. It is populated at mount time and cleaned up after 804 * all block groups are removed. RCU is used to protect it. 805 */ 806 struct list_head space_info; 807 808 struct btrfs_space_info *data_sinfo; 809 810 struct reloc_control *reloc_ctl; 811 812 /* data_alloc_cluster is only used in ssd_spread mode */ 813 struct btrfs_free_cluster data_alloc_cluster; 814 815 /* all metadata allocations go through this cluster */ 816 struct btrfs_free_cluster meta_alloc_cluster; 817 818 /* auto defrag inodes go here */ 819 spinlock_t defrag_inodes_lock; 820 struct rb_root defrag_inodes; 821 atomic_t defrag_running; 822 823 /* Used to protect avail_{data, metadata, system}_alloc_bits */ 824 seqlock_t profiles_lock; 825 /* 826 * these three are in extended format (availability of single 827 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other 828 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits) 829 */ 830 u64 avail_data_alloc_bits; 831 u64 avail_metadata_alloc_bits; 832 u64 avail_system_alloc_bits; 833 834 /* restriper state */ 835 spinlock_t balance_lock; 836 struct mutex balance_mutex; 837 atomic_t balance_pause_req; 838 atomic_t balance_cancel_req; 839 struct btrfs_balance_control *balance_ctl; 840 wait_queue_head_t balance_wait_q; 841 842 u32 data_chunk_allocations; 843 u32 metadata_ratio; 844 845 void *bdev_holder; 846 847 /* private scrub information */ 848 struct mutex scrub_lock; 849 atomic_t scrubs_running; 850 atomic_t scrub_pause_req; 851 atomic_t scrubs_paused; 852 atomic_t scrub_cancel_req; 853 wait_queue_head_t scrub_pause_wait; 854 /* 855 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not 856 * running. 857 */ 858 refcount_t scrub_workers_refcnt; 859 struct btrfs_workqueue *scrub_workers; 860 struct btrfs_workqueue *scrub_wr_completion_workers; 861 struct btrfs_workqueue *scrub_parity_workers; 862 863 struct btrfs_discard_ctl discard_ctl; 864 865 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 866 u32 check_integrity_print_mask; 867 #endif 868 /* is qgroup tracking in a consistent state? */ 869 u64 qgroup_flags; 870 871 /* holds configuration and tracking. Protected by qgroup_lock */ 872 struct rb_root qgroup_tree; 873 spinlock_t qgroup_lock; 874 875 /* 876 * used to avoid frequently calling ulist_alloc()/ulist_free() 877 * when doing qgroup accounting, it must be protected by qgroup_lock. 878 */ 879 struct ulist *qgroup_ulist; 880 881 /* 882 * Protect user change for quota operations. If a transaction is needed, 883 * it must be started before locking this lock. 884 */ 885 struct mutex qgroup_ioctl_lock; 886 887 /* list of dirty qgroups to be written at next commit */ 888 struct list_head dirty_qgroups; 889 890 /* used by qgroup for an efficient tree traversal */ 891 u64 qgroup_seq; 892 893 /* qgroup rescan items */ 894 struct mutex qgroup_rescan_lock; /* protects the progress item */ 895 struct btrfs_key qgroup_rescan_progress; 896 struct btrfs_workqueue *qgroup_rescan_workers; 897 struct completion qgroup_rescan_completion; 898 struct btrfs_work qgroup_rescan_work; 899 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */ 900 901 /* filesystem state */ 902 unsigned long fs_state; 903 904 struct btrfs_delayed_root *delayed_root; 905 906 /* readahead tree */ 907 spinlock_t reada_lock; 908 struct radix_tree_root reada_tree; 909 910 /* readahead works cnt */ 911 atomic_t reada_works_cnt; 912 913 /* Extent buffer radix tree */ 914 spinlock_t buffer_lock; 915 struct radix_tree_root buffer_radix; 916 917 /* next backup root to be overwritten */ 918 int backup_root_index; 919 920 /* device replace state */ 921 struct btrfs_dev_replace dev_replace; 922 923 struct semaphore uuid_tree_rescan_sem; 924 925 /* Used to reclaim the metadata space in the background. */ 926 struct work_struct async_reclaim_work; 927 struct work_struct async_data_reclaim_work; 928 929 spinlock_t unused_bgs_lock; 930 struct list_head unused_bgs; 931 struct mutex unused_bg_unpin_mutex; 932 struct mutex delete_unused_bgs_mutex; 933 934 /* Cached block sizes */ 935 u32 nodesize; 936 u32 sectorsize; 937 u32 stripesize; 938 939 /* Block groups and devices containing active swapfiles. */ 940 spinlock_t swapfile_pins_lock; 941 struct rb_root swapfile_pins; 942 943 struct crypto_shash *csum_shash; 944 945 /* 946 * Number of send operations in progress. 947 * Updated while holding fs_info::balance_mutex. 948 */ 949 int send_in_progress; 950 951 /* Type of exclusive operation running */ 952 unsigned long exclusive_operation; 953 954 #ifdef CONFIG_BTRFS_FS_REF_VERIFY 955 spinlock_t ref_verify_lock; 956 struct rb_root block_tree; 957 #endif 958 959 #ifdef CONFIG_BTRFS_DEBUG 960 struct kobject *debug_kobj; 961 struct kobject *discard_debug_kobj; 962 struct list_head allocated_roots; 963 964 spinlock_t eb_leak_lock; 965 struct list_head allocated_ebs; 966 #endif 967 }; 968 969 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb) 970 { 971 return sb->s_fs_info; 972 } 973 974 /* 975 * The state of btrfs root 976 */ 977 enum { 978 /* 979 * btrfs_record_root_in_trans is a multi-step process, and it can race 980 * with the balancing code. But the race is very small, and only the 981 * first time the root is added to each transaction. So IN_TRANS_SETUP 982 * is used to tell us when more checks are required 983 */ 984 BTRFS_ROOT_IN_TRANS_SETUP, 985 986 /* 987 * Set if tree blocks of this root can be shared by other roots. 988 * Only subvolume trees and their reloc trees have this bit set. 989 * Conflicts with TRACK_DIRTY bit. 990 * 991 * This affects two things: 992 * 993 * - How balance works 994 * For shareable roots, we need to use reloc tree and do path 995 * replacement for balance, and need various pre/post hooks for 996 * snapshot creation to handle them. 997 * 998 * While for non-shareable trees, we just simply do a tree search 999 * with COW. 1000 * 1001 * - How dirty roots are tracked 1002 * For shareable roots, btrfs_record_root_in_trans() is needed to 1003 * track them, while non-subvolume roots have TRACK_DIRTY bit, they 1004 * don't need to set this manually. 1005 */ 1006 BTRFS_ROOT_SHAREABLE, 1007 BTRFS_ROOT_TRACK_DIRTY, 1008 BTRFS_ROOT_IN_RADIX, 1009 BTRFS_ROOT_ORPHAN_ITEM_INSERTED, 1010 BTRFS_ROOT_DEFRAG_RUNNING, 1011 BTRFS_ROOT_FORCE_COW, 1012 BTRFS_ROOT_MULTI_LOG_TASKS, 1013 BTRFS_ROOT_DIRTY, 1014 BTRFS_ROOT_DELETING, 1015 1016 /* 1017 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan 1018 * 1019 * Set for the subvolume tree owning the reloc tree. 1020 */ 1021 BTRFS_ROOT_DEAD_RELOC_TREE, 1022 /* Mark dead root stored on device whose cleanup needs to be resumed */ 1023 BTRFS_ROOT_DEAD_TREE, 1024 /* The root has a log tree. Used only for subvolume roots. */ 1025 BTRFS_ROOT_HAS_LOG_TREE, 1026 /* Qgroup flushing is in progress */ 1027 BTRFS_ROOT_QGROUP_FLUSHING, 1028 }; 1029 1030 /* 1031 * Record swapped tree blocks of a subvolume tree for delayed subtree trace 1032 * code. For detail check comment in fs/btrfs/qgroup.c. 1033 */ 1034 struct btrfs_qgroup_swapped_blocks { 1035 spinlock_t lock; 1036 /* RM_EMPTY_ROOT() of above blocks[] */ 1037 bool swapped; 1038 struct rb_root blocks[BTRFS_MAX_LEVEL]; 1039 }; 1040 1041 /* 1042 * in ram representation of the tree. extent_root is used for all allocations 1043 * and for the extent tree extent_root root. 1044 */ 1045 struct btrfs_root { 1046 struct extent_buffer *node; 1047 1048 struct extent_buffer *commit_root; 1049 struct btrfs_root *log_root; 1050 struct btrfs_root *reloc_root; 1051 1052 unsigned long state; 1053 struct btrfs_root_item root_item; 1054 struct btrfs_key root_key; 1055 struct btrfs_fs_info *fs_info; 1056 struct extent_io_tree dirty_log_pages; 1057 1058 struct mutex objectid_mutex; 1059 1060 spinlock_t accounting_lock; 1061 struct btrfs_block_rsv *block_rsv; 1062 1063 /* free ino cache stuff */ 1064 struct btrfs_free_space_ctl *free_ino_ctl; 1065 enum btrfs_caching_type ino_cache_state; 1066 spinlock_t ino_cache_lock; 1067 wait_queue_head_t ino_cache_wait; 1068 struct btrfs_free_space_ctl *free_ino_pinned; 1069 u64 ino_cache_progress; 1070 struct inode *ino_cache_inode; 1071 1072 struct mutex log_mutex; 1073 wait_queue_head_t log_writer_wait; 1074 wait_queue_head_t log_commit_wait[2]; 1075 struct list_head log_ctxs[2]; 1076 /* Used only for log trees of subvolumes, not for the log root tree */ 1077 atomic_t log_writers; 1078 atomic_t log_commit[2]; 1079 /* Used only for log trees of subvolumes, not for the log root tree */ 1080 atomic_t log_batch; 1081 int log_transid; 1082 /* No matter the commit succeeds or not*/ 1083 int log_transid_committed; 1084 /* Just be updated when the commit succeeds. */ 1085 int last_log_commit; 1086 pid_t log_start_pid; 1087 1088 u64 last_trans; 1089 1090 u32 type; 1091 1092 u64 highest_objectid; 1093 1094 struct btrfs_key defrag_progress; 1095 struct btrfs_key defrag_max; 1096 1097 /* The dirty list is only used by non-shareable roots */ 1098 struct list_head dirty_list; 1099 1100 struct list_head root_list; 1101 1102 spinlock_t log_extents_lock[2]; 1103 struct list_head logged_list[2]; 1104 1105 int orphan_cleanup_state; 1106 1107 spinlock_t inode_lock; 1108 /* red-black tree that keeps track of in-memory inodes */ 1109 struct rb_root inode_tree; 1110 1111 /* 1112 * radix tree that keeps track of delayed nodes of every inode, 1113 * protected by inode_lock 1114 */ 1115 struct radix_tree_root delayed_nodes_tree; 1116 /* 1117 * right now this just gets used so that a root has its own devid 1118 * for stat. It may be used for more later 1119 */ 1120 dev_t anon_dev; 1121 1122 spinlock_t root_item_lock; 1123 refcount_t refs; 1124 1125 struct mutex delalloc_mutex; 1126 spinlock_t delalloc_lock; 1127 /* 1128 * all of the inodes that have delalloc bytes. It is possible for 1129 * this list to be empty even when there is still dirty data=ordered 1130 * extents waiting to finish IO. 1131 */ 1132 struct list_head delalloc_inodes; 1133 struct list_head delalloc_root; 1134 u64 nr_delalloc_inodes; 1135 1136 struct mutex ordered_extent_mutex; 1137 /* 1138 * this is used by the balancing code to wait for all the pending 1139 * ordered extents 1140 */ 1141 spinlock_t ordered_extent_lock; 1142 1143 /* 1144 * all of the data=ordered extents pending writeback 1145 * these can span multiple transactions and basically include 1146 * every dirty data page that isn't from nodatacow 1147 */ 1148 struct list_head ordered_extents; 1149 struct list_head ordered_root; 1150 u64 nr_ordered_extents; 1151 1152 /* 1153 * Not empty if this subvolume root has gone through tree block swap 1154 * (relocation) 1155 * 1156 * Will be used by reloc_control::dirty_subvol_roots. 1157 */ 1158 struct list_head reloc_dirty_list; 1159 1160 /* 1161 * Number of currently running SEND ioctls to prevent 1162 * manipulation with the read-only status via SUBVOL_SETFLAGS 1163 */ 1164 int send_in_progress; 1165 /* 1166 * Number of currently running deduplication operations that have a 1167 * destination inode belonging to this root. Protected by the lock 1168 * root_item_lock. 1169 */ 1170 int dedupe_in_progress; 1171 /* For exclusion of snapshot creation and nocow writes */ 1172 struct btrfs_drew_lock snapshot_lock; 1173 1174 atomic_t snapshot_force_cow; 1175 1176 /* For qgroup metadata reserved space */ 1177 spinlock_t qgroup_meta_rsv_lock; 1178 u64 qgroup_meta_rsv_pertrans; 1179 u64 qgroup_meta_rsv_prealloc; 1180 wait_queue_head_t qgroup_flush_wait; 1181 1182 /* Number of active swapfiles */ 1183 atomic_t nr_swapfiles; 1184 1185 /* Record pairs of swapped blocks for qgroup */ 1186 struct btrfs_qgroup_swapped_blocks swapped_blocks; 1187 1188 /* Used only by log trees, when logging csum items */ 1189 struct extent_io_tree log_csum_range; 1190 1191 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 1192 u64 alloc_bytenr; 1193 #endif 1194 1195 #ifdef CONFIG_BTRFS_DEBUG 1196 struct list_head leak_list; 1197 #endif 1198 }; 1199 1200 /* 1201 * Structure that conveys information about an extent that is going to replace 1202 * all the extents in a file range. 1203 */ 1204 struct btrfs_replace_extent_info { 1205 u64 disk_offset; 1206 u64 disk_len; 1207 u64 data_offset; 1208 u64 data_len; 1209 u64 file_offset; 1210 /* Pointer to a file extent item of type regular or prealloc. */ 1211 char *extent_buf; 1212 /* 1213 * Set to true when attempting to replace a file range with a new extent 1214 * described by this structure, set to false when attempting to clone an 1215 * existing extent into a file range. 1216 */ 1217 bool is_new_extent; 1218 /* Meaningful only if is_new_extent is true. */ 1219 int qgroup_reserved; 1220 /* 1221 * Meaningful only if is_new_extent is true. 1222 * Used to track how many extent items we have already inserted in a 1223 * subvolume tree that refer to the extent described by this structure, 1224 * so that we know when to create a new delayed ref or update an existing 1225 * one. 1226 */ 1227 int insertions; 1228 }; 1229 1230 struct btrfs_file_private { 1231 void *filldir_buf; 1232 }; 1233 1234 1235 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info) 1236 { 1237 1238 return info->nodesize - sizeof(struct btrfs_header); 1239 } 1240 1241 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items) 1242 1243 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info) 1244 { 1245 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item); 1246 } 1247 1248 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info) 1249 { 1250 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr); 1251 } 1252 1253 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \ 1254 (offsetof(struct btrfs_file_extent_item, disk_bytenr)) 1255 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info) 1256 { 1257 return BTRFS_MAX_ITEM_SIZE(info) - 1258 BTRFS_FILE_EXTENT_INLINE_DATA_START; 1259 } 1260 1261 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info) 1262 { 1263 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item); 1264 } 1265 1266 /* 1267 * Flags for mount options. 1268 * 1269 * Note: don't forget to add new options to btrfs_show_options() 1270 */ 1271 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1272 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1273 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1274 #define BTRFS_MOUNT_SSD (1 << 3) 1275 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1276 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1277 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1278 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1279 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8) 1280 #define BTRFS_MOUNT_NOSSD (1 << 9) 1281 #define BTRFS_MOUNT_DISCARD_SYNC (1 << 10) 1282 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11) 1283 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12) 1284 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13) 1285 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14) 1286 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) 1287 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16) 1288 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17) 1289 #define BTRFS_MOUNT_USEBACKUPROOT (1 << 18) 1290 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19) 1291 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20) 1292 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21) 1293 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22) 1294 #define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23) 1295 #define BTRFS_MOUNT_FRAGMENT_DATA (1 << 24) 1296 #define BTRFS_MOUNT_FRAGMENT_METADATA (1 << 25) 1297 #define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 26) 1298 #define BTRFS_MOUNT_NOLOGREPLAY (1 << 27) 1299 #define BTRFS_MOUNT_REF_VERIFY (1 << 28) 1300 #define BTRFS_MOUNT_DISCARD_ASYNC (1 << 29) 1301 1302 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) 1303 #define BTRFS_DEFAULT_MAX_INLINE (2048) 1304 1305 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1306 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1307 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt) 1308 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \ 1309 BTRFS_MOUNT_##opt) 1310 1311 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \ 1312 do { \ 1313 if (!btrfs_test_opt(fs_info, opt)) \ 1314 btrfs_info(fs_info, fmt, ##args); \ 1315 btrfs_set_opt(fs_info->mount_opt, opt); \ 1316 } while (0) 1317 1318 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \ 1319 do { \ 1320 if (btrfs_test_opt(fs_info, opt)) \ 1321 btrfs_info(fs_info, fmt, ##args); \ 1322 btrfs_clear_opt(fs_info->mount_opt, opt); \ 1323 } while (0) 1324 1325 /* 1326 * Requests for changes that need to be done during transaction commit. 1327 * 1328 * Internal mount options that are used for special handling of the real 1329 * mount options (eg. cannot be set during remount and have to be set during 1330 * transaction commit) 1331 */ 1332 1333 #define BTRFS_PENDING_SET_INODE_MAP_CACHE (0) 1334 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1) 1335 #define BTRFS_PENDING_COMMIT (2) 1336 1337 #define btrfs_test_pending(info, opt) \ 1338 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1339 #define btrfs_set_pending(info, opt) \ 1340 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1341 #define btrfs_clear_pending(info, opt) \ 1342 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1343 1344 /* 1345 * Helpers for setting pending mount option changes. 1346 * 1347 * Expects corresponding macros 1348 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name 1349 */ 1350 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \ 1351 do { \ 1352 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \ 1353 btrfs_info((info), fmt, ##args); \ 1354 btrfs_set_pending((info), SET_##opt); \ 1355 btrfs_clear_pending((info), CLEAR_##opt); \ 1356 } \ 1357 } while(0) 1358 1359 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \ 1360 do { \ 1361 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \ 1362 btrfs_info((info), fmt, ##args); \ 1363 btrfs_set_pending((info), CLEAR_##opt); \ 1364 btrfs_clear_pending((info), SET_##opt); \ 1365 } \ 1366 } while(0) 1367 1368 /* 1369 * Inode flags 1370 */ 1371 #define BTRFS_INODE_NODATASUM (1 << 0) 1372 #define BTRFS_INODE_NODATACOW (1 << 1) 1373 #define BTRFS_INODE_READONLY (1 << 2) 1374 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 1375 #define BTRFS_INODE_PREALLOC (1 << 4) 1376 #define BTRFS_INODE_SYNC (1 << 5) 1377 #define BTRFS_INODE_IMMUTABLE (1 << 6) 1378 #define BTRFS_INODE_APPEND (1 << 7) 1379 #define BTRFS_INODE_NODUMP (1 << 8) 1380 #define BTRFS_INODE_NOATIME (1 << 9) 1381 #define BTRFS_INODE_DIRSYNC (1 << 10) 1382 #define BTRFS_INODE_COMPRESS (1 << 11) 1383 1384 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) 1385 1386 #define BTRFS_INODE_FLAG_MASK \ 1387 (BTRFS_INODE_NODATASUM | \ 1388 BTRFS_INODE_NODATACOW | \ 1389 BTRFS_INODE_READONLY | \ 1390 BTRFS_INODE_NOCOMPRESS | \ 1391 BTRFS_INODE_PREALLOC | \ 1392 BTRFS_INODE_SYNC | \ 1393 BTRFS_INODE_IMMUTABLE | \ 1394 BTRFS_INODE_APPEND | \ 1395 BTRFS_INODE_NODUMP | \ 1396 BTRFS_INODE_NOATIME | \ 1397 BTRFS_INODE_DIRSYNC | \ 1398 BTRFS_INODE_COMPRESS | \ 1399 BTRFS_INODE_ROOT_ITEM_INIT) 1400 1401 struct btrfs_map_token { 1402 struct extent_buffer *eb; 1403 char *kaddr; 1404 unsigned long offset; 1405 }; 1406 1407 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \ 1408 ((bytes) >> (fs_info)->sb->s_blocksize_bits) 1409 1410 static inline void btrfs_init_map_token(struct btrfs_map_token *token, 1411 struct extent_buffer *eb) 1412 { 1413 token->eb = eb; 1414 token->kaddr = page_address(eb->pages[0]); 1415 token->offset = 0; 1416 } 1417 1418 /* some macros to generate set/get functions for the struct fields. This 1419 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 1420 * one for u8: 1421 */ 1422 #define le8_to_cpu(v) (v) 1423 #define cpu_to_le8(v) (v) 1424 #define __le8 u8 1425 1426 static inline u8 get_unaligned_le8(const void *p) 1427 { 1428 return *(u8 *)p; 1429 } 1430 1431 static inline void put_unaligned_le8(u8 val, void *p) 1432 { 1433 *(u8 *)p = val; 1434 } 1435 1436 #define read_eb_member(eb, ptr, type, member, result) (\ 1437 read_extent_buffer(eb, (char *)(result), \ 1438 ((unsigned long)(ptr)) + \ 1439 offsetof(type, member), \ 1440 sizeof(((type *)0)->member))) 1441 1442 #define write_eb_member(eb, ptr, type, member, result) (\ 1443 write_extent_buffer(eb, (char *)(result), \ 1444 ((unsigned long)(ptr)) + \ 1445 offsetof(type, member), \ 1446 sizeof(((type *)0)->member))) 1447 1448 #define DECLARE_BTRFS_SETGET_BITS(bits) \ 1449 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \ 1450 const void *ptr, unsigned long off); \ 1451 void btrfs_set_token_##bits(struct btrfs_map_token *token, \ 1452 const void *ptr, unsigned long off, \ 1453 u##bits val); \ 1454 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \ 1455 const void *ptr, unsigned long off); \ 1456 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \ 1457 unsigned long off, u##bits val); 1458 1459 DECLARE_BTRFS_SETGET_BITS(8) 1460 DECLARE_BTRFS_SETGET_BITS(16) 1461 DECLARE_BTRFS_SETGET_BITS(32) 1462 DECLARE_BTRFS_SETGET_BITS(64) 1463 1464 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 1465 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \ 1466 const type *s) \ 1467 { \ 1468 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1469 return btrfs_get_##bits(eb, s, offsetof(type, member)); \ 1470 } \ 1471 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \ 1472 u##bits val) \ 1473 { \ 1474 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1475 btrfs_set_##bits(eb, s, offsetof(type, member), val); \ 1476 } \ 1477 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \ 1478 const type *s) \ 1479 { \ 1480 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1481 return btrfs_get_token_##bits(token, s, offsetof(type, member));\ 1482 } \ 1483 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\ 1484 type *s, u##bits val) \ 1485 { \ 1486 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1487 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \ 1488 } 1489 1490 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 1491 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \ 1492 { \ 1493 const type *p = page_address(eb->pages[0]); \ 1494 return get_unaligned_le##bits(&p->member); \ 1495 } \ 1496 static inline void btrfs_set_##name(const struct extent_buffer *eb, \ 1497 u##bits val) \ 1498 { \ 1499 type *p = page_address(eb->pages[0]); \ 1500 put_unaligned_le##bits(val, &p->member); \ 1501 } 1502 1503 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 1504 static inline u##bits btrfs_##name(const type *s) \ 1505 { \ 1506 return get_unaligned_le##bits(&s->member); \ 1507 } \ 1508 static inline void btrfs_set_##name(type *s, u##bits val) \ 1509 { \ 1510 put_unaligned_le##bits(val, &s->member); \ 1511 } 1512 1513 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb, 1514 struct btrfs_dev_item *s) 1515 { 1516 BUILD_BUG_ON(sizeof(u64) != 1517 sizeof(((struct btrfs_dev_item *)0))->total_bytes); 1518 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item, 1519 total_bytes)); 1520 } 1521 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb, 1522 struct btrfs_dev_item *s, 1523 u64 val) 1524 { 1525 BUILD_BUG_ON(sizeof(u64) != 1526 sizeof(((struct btrfs_dev_item *)0))->total_bytes); 1527 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize)); 1528 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val); 1529 } 1530 1531 1532 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 1533 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 1534 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 1535 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 1536 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 1537 start_offset, 64); 1538 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 1539 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 1540 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 1541 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 1542 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 1543 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 1544 1545 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 1546 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 1547 total_bytes, 64); 1548 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 1549 bytes_used, 64); 1550 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 1551 io_align, 32); 1552 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 1553 io_width, 32); 1554 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 1555 sector_size, 32); 1556 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 1557 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 1558 dev_group, 32); 1559 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 1560 seek_speed, 8); 1561 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 1562 bandwidth, 8); 1563 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 1564 generation, 64); 1565 1566 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d) 1567 { 1568 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid); 1569 } 1570 1571 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d) 1572 { 1573 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid); 1574 } 1575 1576 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 1577 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 1578 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 1579 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 1580 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 1581 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 1582 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 1583 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 1584 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 1585 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 1586 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 1587 1588 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 1589 { 1590 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 1591 } 1592 1593 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 1594 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 1595 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 1596 stripe_len, 64); 1597 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 1598 io_align, 32); 1599 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 1600 io_width, 32); 1601 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 1602 sector_size, 32); 1603 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 1604 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 1605 num_stripes, 16); 1606 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 1607 sub_stripes, 16); 1608 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 1609 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 1610 1611 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 1612 int nr) 1613 { 1614 unsigned long offset = (unsigned long)c; 1615 offset += offsetof(struct btrfs_chunk, stripe); 1616 offset += nr * sizeof(struct btrfs_stripe); 1617 return (struct btrfs_stripe *)offset; 1618 } 1619 1620 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 1621 { 1622 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 1623 } 1624 1625 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb, 1626 struct btrfs_chunk *c, int nr) 1627 { 1628 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 1629 } 1630 1631 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb, 1632 struct btrfs_chunk *c, int nr) 1633 { 1634 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 1635 } 1636 1637 /* struct btrfs_block_group_item */ 1638 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item, 1639 used, 64); 1640 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item, 1641 used, 64); 1642 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid, 1643 struct btrfs_block_group_item, chunk_objectid, 64); 1644 1645 BTRFS_SETGET_FUNCS(block_group_chunk_objectid, 1646 struct btrfs_block_group_item, chunk_objectid, 64); 1647 BTRFS_SETGET_FUNCS(block_group_flags, 1648 struct btrfs_block_group_item, flags, 64); 1649 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags, 1650 struct btrfs_block_group_item, flags, 64); 1651 1652 /* struct btrfs_free_space_info */ 1653 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info, 1654 extent_count, 32); 1655 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32); 1656 1657 /* struct btrfs_inode_ref */ 1658 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 1659 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 1660 1661 /* struct btrfs_inode_extref */ 1662 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref, 1663 parent_objectid, 64); 1664 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref, 1665 name_len, 16); 1666 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64); 1667 1668 /* struct btrfs_inode_item */ 1669 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 1670 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 1671 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 1672 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 1673 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 1674 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 1675 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 1676 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 1677 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 1678 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 1679 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 1680 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 1681 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item, 1682 generation, 64); 1683 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item, 1684 sequence, 64); 1685 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item, 1686 transid, 64); 1687 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64); 1688 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item, 1689 nbytes, 64); 1690 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item, 1691 block_group, 64); 1692 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32); 1693 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32); 1694 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32); 1695 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32); 1696 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64); 1697 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64); 1698 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 1699 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 1700 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64); 1701 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32); 1702 1703 /* struct btrfs_dev_extent */ 1704 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 1705 chunk_tree, 64); 1706 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 1707 chunk_objectid, 64); 1708 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 1709 chunk_offset, 64); 1710 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 1711 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64); 1712 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item, 1713 generation, 64); 1714 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); 1715 1716 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8); 1717 1718 static inline void btrfs_tree_block_key(const struct extent_buffer *eb, 1719 struct btrfs_tree_block_info *item, 1720 struct btrfs_disk_key *key) 1721 { 1722 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1723 } 1724 1725 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb, 1726 struct btrfs_tree_block_info *item, 1727 struct btrfs_disk_key *key) 1728 { 1729 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1730 } 1731 1732 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref, 1733 root, 64); 1734 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref, 1735 objectid, 64); 1736 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref, 1737 offset, 64); 1738 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref, 1739 count, 32); 1740 1741 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref, 1742 count, 32); 1743 1744 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref, 1745 type, 8); 1746 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref, 1747 offset, 64); 1748 1749 static inline u32 btrfs_extent_inline_ref_size(int type) 1750 { 1751 if (type == BTRFS_TREE_BLOCK_REF_KEY || 1752 type == BTRFS_SHARED_BLOCK_REF_KEY) 1753 return sizeof(struct btrfs_extent_inline_ref); 1754 if (type == BTRFS_SHARED_DATA_REF_KEY) 1755 return sizeof(struct btrfs_shared_data_ref) + 1756 sizeof(struct btrfs_extent_inline_ref); 1757 if (type == BTRFS_EXTENT_DATA_REF_KEY) 1758 return sizeof(struct btrfs_extent_data_ref) + 1759 offsetof(struct btrfs_extent_inline_ref, offset); 1760 return 0; 1761 } 1762 1763 /* struct btrfs_node */ 1764 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 1765 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 1766 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr, 1767 blockptr, 64); 1768 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr, 1769 generation, 64); 1770 1771 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr) 1772 { 1773 unsigned long ptr; 1774 ptr = offsetof(struct btrfs_node, ptrs) + 1775 sizeof(struct btrfs_key_ptr) * nr; 1776 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 1777 } 1778 1779 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb, 1780 int nr, u64 val) 1781 { 1782 unsigned long ptr; 1783 ptr = offsetof(struct btrfs_node, ptrs) + 1784 sizeof(struct btrfs_key_ptr) * nr; 1785 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 1786 } 1787 1788 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr) 1789 { 1790 unsigned long ptr; 1791 ptr = offsetof(struct btrfs_node, ptrs) + 1792 sizeof(struct btrfs_key_ptr) * nr; 1793 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 1794 } 1795 1796 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb, 1797 int nr, u64 val) 1798 { 1799 unsigned long ptr; 1800 ptr = offsetof(struct btrfs_node, ptrs) + 1801 sizeof(struct btrfs_key_ptr) * nr; 1802 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 1803 } 1804 1805 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 1806 { 1807 return offsetof(struct btrfs_node, ptrs) + 1808 sizeof(struct btrfs_key_ptr) * nr; 1809 } 1810 1811 void btrfs_node_key(const struct extent_buffer *eb, 1812 struct btrfs_disk_key *disk_key, int nr); 1813 1814 static inline void btrfs_set_node_key(const struct extent_buffer *eb, 1815 struct btrfs_disk_key *disk_key, int nr) 1816 { 1817 unsigned long ptr; 1818 ptr = btrfs_node_key_ptr_offset(nr); 1819 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 1820 struct btrfs_key_ptr, key, disk_key); 1821 } 1822 1823 /* struct btrfs_item */ 1824 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 1825 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 1826 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32); 1827 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32); 1828 1829 static inline unsigned long btrfs_item_nr_offset(int nr) 1830 { 1831 return offsetof(struct btrfs_leaf, items) + 1832 sizeof(struct btrfs_item) * nr; 1833 } 1834 1835 static inline struct btrfs_item *btrfs_item_nr(int nr) 1836 { 1837 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 1838 } 1839 1840 static inline u32 btrfs_item_end(const struct extent_buffer *eb, 1841 struct btrfs_item *item) 1842 { 1843 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 1844 } 1845 1846 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr) 1847 { 1848 return btrfs_item_end(eb, btrfs_item_nr(nr)); 1849 } 1850 1851 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr) 1852 { 1853 return btrfs_item_offset(eb, btrfs_item_nr(nr)); 1854 } 1855 1856 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr) 1857 { 1858 return btrfs_item_size(eb, btrfs_item_nr(nr)); 1859 } 1860 1861 static inline void btrfs_item_key(const struct extent_buffer *eb, 1862 struct btrfs_disk_key *disk_key, int nr) 1863 { 1864 struct btrfs_item *item = btrfs_item_nr(nr); 1865 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 1866 } 1867 1868 static inline void btrfs_set_item_key(struct extent_buffer *eb, 1869 struct btrfs_disk_key *disk_key, int nr) 1870 { 1871 struct btrfs_item *item = btrfs_item_nr(nr); 1872 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 1873 } 1874 1875 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 1876 1877 /* 1878 * struct btrfs_root_ref 1879 */ 1880 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 1881 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 1882 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 1883 1884 /* struct btrfs_dir_item */ 1885 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 1886 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 1887 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 1888 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 1889 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8); 1890 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, 1891 data_len, 16); 1892 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, 1893 name_len, 16); 1894 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, 1895 transid, 64); 1896 1897 static inline void btrfs_dir_item_key(const struct extent_buffer *eb, 1898 const struct btrfs_dir_item *item, 1899 struct btrfs_disk_key *key) 1900 { 1901 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 1902 } 1903 1904 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 1905 struct btrfs_dir_item *item, 1906 const struct btrfs_disk_key *key) 1907 { 1908 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 1909 } 1910 1911 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header, 1912 num_entries, 64); 1913 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header, 1914 num_bitmaps, 64); 1915 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header, 1916 generation, 64); 1917 1918 static inline void btrfs_free_space_key(const struct extent_buffer *eb, 1919 const struct btrfs_free_space_header *h, 1920 struct btrfs_disk_key *key) 1921 { 1922 read_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1923 } 1924 1925 static inline void btrfs_set_free_space_key(struct extent_buffer *eb, 1926 struct btrfs_free_space_header *h, 1927 const struct btrfs_disk_key *key) 1928 { 1929 write_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1930 } 1931 1932 /* struct btrfs_disk_key */ 1933 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 1934 objectid, 64); 1935 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 1936 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 1937 1938 #ifdef __LITTLE_ENDIAN 1939 1940 /* 1941 * Optimized helpers for little-endian architectures where CPU and on-disk 1942 * structures have the same endianness and we can skip conversions. 1943 */ 1944 1945 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key, 1946 const struct btrfs_disk_key *disk_key) 1947 { 1948 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key)); 1949 } 1950 1951 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key, 1952 const struct btrfs_key *cpu_key) 1953 { 1954 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key)); 1955 } 1956 1957 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb, 1958 struct btrfs_key *cpu_key, int nr) 1959 { 1960 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key; 1961 1962 btrfs_node_key(eb, disk_key, nr); 1963 } 1964 1965 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb, 1966 struct btrfs_key *cpu_key, int nr) 1967 { 1968 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key; 1969 1970 btrfs_item_key(eb, disk_key, nr); 1971 } 1972 1973 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb, 1974 const struct btrfs_dir_item *item, 1975 struct btrfs_key *cpu_key) 1976 { 1977 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key; 1978 1979 btrfs_dir_item_key(eb, item, disk_key); 1980 } 1981 1982 #else 1983 1984 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 1985 const struct btrfs_disk_key *disk) 1986 { 1987 cpu->offset = le64_to_cpu(disk->offset); 1988 cpu->type = disk->type; 1989 cpu->objectid = le64_to_cpu(disk->objectid); 1990 } 1991 1992 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 1993 const struct btrfs_key *cpu) 1994 { 1995 disk->offset = cpu_to_le64(cpu->offset); 1996 disk->type = cpu->type; 1997 disk->objectid = cpu_to_le64(cpu->objectid); 1998 } 1999 2000 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb, 2001 struct btrfs_key *key, int nr) 2002 { 2003 struct btrfs_disk_key disk_key; 2004 btrfs_node_key(eb, &disk_key, nr); 2005 btrfs_disk_key_to_cpu(key, &disk_key); 2006 } 2007 2008 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb, 2009 struct btrfs_key *key, int nr) 2010 { 2011 struct btrfs_disk_key disk_key; 2012 btrfs_item_key(eb, &disk_key, nr); 2013 btrfs_disk_key_to_cpu(key, &disk_key); 2014 } 2015 2016 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb, 2017 const struct btrfs_dir_item *item, 2018 struct btrfs_key *key) 2019 { 2020 struct btrfs_disk_key disk_key; 2021 btrfs_dir_item_key(eb, item, &disk_key); 2022 btrfs_disk_key_to_cpu(key, &disk_key); 2023 } 2024 2025 #endif 2026 2027 /* struct btrfs_header */ 2028 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 2029 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 2030 generation, 64); 2031 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 2032 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 2033 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 2034 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 2035 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header, 2036 generation, 64); 2037 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64); 2038 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, 2039 nritems, 32); 2040 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64); 2041 2042 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag) 2043 { 2044 return (btrfs_header_flags(eb) & flag) == flag; 2045 } 2046 2047 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 2048 { 2049 u64 flags = btrfs_header_flags(eb); 2050 btrfs_set_header_flags(eb, flags | flag); 2051 } 2052 2053 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 2054 { 2055 u64 flags = btrfs_header_flags(eb); 2056 btrfs_set_header_flags(eb, flags & ~flag); 2057 } 2058 2059 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb) 2060 { 2061 u64 flags = btrfs_header_flags(eb); 2062 return flags >> BTRFS_BACKREF_REV_SHIFT; 2063 } 2064 2065 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb, 2066 int rev) 2067 { 2068 u64 flags = btrfs_header_flags(eb); 2069 flags &= ~BTRFS_BACKREF_REV_MASK; 2070 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT; 2071 btrfs_set_header_flags(eb, flags); 2072 } 2073 2074 static inline int btrfs_is_leaf(const struct extent_buffer *eb) 2075 { 2076 return btrfs_header_level(eb) == 0; 2077 } 2078 2079 /* struct btrfs_root_item */ 2080 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 2081 generation, 64); 2082 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 2083 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 2084 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 2085 2086 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 2087 generation, 64); 2088 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 2089 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 2090 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 2091 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 2092 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 2093 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 2094 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 2095 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 2096 last_snapshot, 64); 2097 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item, 2098 generation_v2, 64); 2099 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item, 2100 ctransid, 64); 2101 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item, 2102 otransid, 64); 2103 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item, 2104 stransid, 64); 2105 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item, 2106 rtransid, 64); 2107 2108 static inline bool btrfs_root_readonly(const struct btrfs_root *root) 2109 { 2110 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0; 2111 } 2112 2113 static inline bool btrfs_root_dead(const struct btrfs_root *root) 2114 { 2115 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0; 2116 } 2117 2118 /* struct btrfs_root_backup */ 2119 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup, 2120 tree_root, 64); 2121 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup, 2122 tree_root_gen, 64); 2123 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup, 2124 tree_root_level, 8); 2125 2126 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup, 2127 chunk_root, 64); 2128 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup, 2129 chunk_root_gen, 64); 2130 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup, 2131 chunk_root_level, 8); 2132 2133 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup, 2134 extent_root, 64); 2135 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup, 2136 extent_root_gen, 64); 2137 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup, 2138 extent_root_level, 8); 2139 2140 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup, 2141 fs_root, 64); 2142 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup, 2143 fs_root_gen, 64); 2144 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup, 2145 fs_root_level, 8); 2146 2147 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup, 2148 dev_root, 64); 2149 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup, 2150 dev_root_gen, 64); 2151 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup, 2152 dev_root_level, 8); 2153 2154 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup, 2155 csum_root, 64); 2156 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup, 2157 csum_root_gen, 64); 2158 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup, 2159 csum_root_level, 8); 2160 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup, 2161 total_bytes, 64); 2162 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup, 2163 bytes_used, 64); 2164 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup, 2165 num_devices, 64); 2166 2167 /* struct btrfs_balance_item */ 2168 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64); 2169 2170 static inline void btrfs_balance_data(const struct extent_buffer *eb, 2171 const struct btrfs_balance_item *bi, 2172 struct btrfs_disk_balance_args *ba) 2173 { 2174 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2175 } 2176 2177 static inline void btrfs_set_balance_data(struct extent_buffer *eb, 2178 struct btrfs_balance_item *bi, 2179 const struct btrfs_disk_balance_args *ba) 2180 { 2181 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2182 } 2183 2184 static inline void btrfs_balance_meta(const struct extent_buffer *eb, 2185 const struct btrfs_balance_item *bi, 2186 struct btrfs_disk_balance_args *ba) 2187 { 2188 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2189 } 2190 2191 static inline void btrfs_set_balance_meta(struct extent_buffer *eb, 2192 struct btrfs_balance_item *bi, 2193 const struct btrfs_disk_balance_args *ba) 2194 { 2195 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2196 } 2197 2198 static inline void btrfs_balance_sys(const struct extent_buffer *eb, 2199 const struct btrfs_balance_item *bi, 2200 struct btrfs_disk_balance_args *ba) 2201 { 2202 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2203 } 2204 2205 static inline void btrfs_set_balance_sys(struct extent_buffer *eb, 2206 struct btrfs_balance_item *bi, 2207 const struct btrfs_disk_balance_args *ba) 2208 { 2209 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2210 } 2211 2212 static inline void 2213 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu, 2214 const struct btrfs_disk_balance_args *disk) 2215 { 2216 memset(cpu, 0, sizeof(*cpu)); 2217 2218 cpu->profiles = le64_to_cpu(disk->profiles); 2219 cpu->usage = le64_to_cpu(disk->usage); 2220 cpu->devid = le64_to_cpu(disk->devid); 2221 cpu->pstart = le64_to_cpu(disk->pstart); 2222 cpu->pend = le64_to_cpu(disk->pend); 2223 cpu->vstart = le64_to_cpu(disk->vstart); 2224 cpu->vend = le64_to_cpu(disk->vend); 2225 cpu->target = le64_to_cpu(disk->target); 2226 cpu->flags = le64_to_cpu(disk->flags); 2227 cpu->limit = le64_to_cpu(disk->limit); 2228 cpu->stripes_min = le32_to_cpu(disk->stripes_min); 2229 cpu->stripes_max = le32_to_cpu(disk->stripes_max); 2230 } 2231 2232 static inline void 2233 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk, 2234 const struct btrfs_balance_args *cpu) 2235 { 2236 memset(disk, 0, sizeof(*disk)); 2237 2238 disk->profiles = cpu_to_le64(cpu->profiles); 2239 disk->usage = cpu_to_le64(cpu->usage); 2240 disk->devid = cpu_to_le64(cpu->devid); 2241 disk->pstart = cpu_to_le64(cpu->pstart); 2242 disk->pend = cpu_to_le64(cpu->pend); 2243 disk->vstart = cpu_to_le64(cpu->vstart); 2244 disk->vend = cpu_to_le64(cpu->vend); 2245 disk->target = cpu_to_le64(cpu->target); 2246 disk->flags = cpu_to_le64(cpu->flags); 2247 disk->limit = cpu_to_le64(cpu->limit); 2248 disk->stripes_min = cpu_to_le32(cpu->stripes_min); 2249 disk->stripes_max = cpu_to_le32(cpu->stripes_max); 2250 } 2251 2252 /* struct btrfs_super_block */ 2253 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 2254 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 2255 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 2256 generation, 64); 2257 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 2258 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 2259 struct btrfs_super_block, sys_chunk_array_size, 32); 2260 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 2261 struct btrfs_super_block, chunk_root_generation, 64); 2262 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 2263 root_level, 8); 2264 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 2265 chunk_root, 64); 2266 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 2267 chunk_root_level, 8); 2268 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 2269 log_root, 64); 2270 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 2271 log_root_transid, 64); 2272 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 2273 log_root_level, 8); 2274 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 2275 total_bytes, 64); 2276 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 2277 bytes_used, 64); 2278 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 2279 sectorsize, 32); 2280 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 2281 nodesize, 32); 2282 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 2283 stripesize, 32); 2284 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 2285 root_dir_objectid, 64); 2286 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 2287 num_devices, 64); 2288 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 2289 compat_flags, 64); 2290 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 2291 compat_ro_flags, 64); 2292 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 2293 incompat_flags, 64); 2294 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 2295 csum_type, 16); 2296 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block, 2297 cache_generation, 64); 2298 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64); 2299 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block, 2300 uuid_tree_generation, 64); 2301 2302 int btrfs_super_csum_size(const struct btrfs_super_block *s); 2303 const char *btrfs_super_csum_name(u16 csum_type); 2304 const char *btrfs_super_csum_driver(u16 csum_type); 2305 size_t __attribute_const__ btrfs_get_num_csums(void); 2306 2307 2308 /* 2309 * The leaf data grows from end-to-front in the node. 2310 * this returns the address of the start of the last item, 2311 * which is the stop of the leaf data stack 2312 */ 2313 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf) 2314 { 2315 u32 nr = btrfs_header_nritems(leaf); 2316 2317 if (nr == 0) 2318 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info); 2319 return btrfs_item_offset_nr(leaf, nr - 1); 2320 } 2321 2322 /* struct btrfs_file_extent_item */ 2323 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, 2324 type, 8); 2325 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, 2326 struct btrfs_file_extent_item, disk_bytenr, 64); 2327 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, 2328 struct btrfs_file_extent_item, offset, 64); 2329 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, 2330 struct btrfs_file_extent_item, generation, 64); 2331 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, 2332 struct btrfs_file_extent_item, num_bytes, 64); 2333 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, 2334 struct btrfs_file_extent_item, ram_bytes, 64); 2335 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes, 2336 struct btrfs_file_extent_item, disk_num_bytes, 64); 2337 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, 2338 struct btrfs_file_extent_item, compression, 8); 2339 2340 static inline unsigned long 2341 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e) 2342 { 2343 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START; 2344 } 2345 2346 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 2347 { 2348 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize; 2349 } 2350 2351 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 2352 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 2353 disk_bytenr, 64); 2354 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 2355 generation, 64); 2356 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 2357 disk_num_bytes, 64); 2358 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 2359 offset, 64); 2360 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 2361 num_bytes, 64); 2362 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 2363 ram_bytes, 64); 2364 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 2365 compression, 8); 2366 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 2367 encryption, 8); 2368 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 2369 other_encoding, 16); 2370 2371 /* 2372 * this returns the number of bytes used by the item on disk, minus the 2373 * size of any extent headers. If a file is compressed on disk, this is 2374 * the compressed size 2375 */ 2376 static inline u32 btrfs_file_extent_inline_item_len( 2377 const struct extent_buffer *eb, 2378 struct btrfs_item *e) 2379 { 2380 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START; 2381 } 2382 2383 /* btrfs_qgroup_status_item */ 2384 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item, 2385 generation, 64); 2386 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item, 2387 version, 64); 2388 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item, 2389 flags, 64); 2390 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item, 2391 rescan, 64); 2392 2393 /* btrfs_qgroup_info_item */ 2394 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item, 2395 generation, 64); 2396 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64); 2397 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item, 2398 rfer_cmpr, 64); 2399 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64); 2400 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item, 2401 excl_cmpr, 64); 2402 2403 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation, 2404 struct btrfs_qgroup_info_item, generation, 64); 2405 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item, 2406 rfer, 64); 2407 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr, 2408 struct btrfs_qgroup_info_item, rfer_cmpr, 64); 2409 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item, 2410 excl, 64); 2411 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr, 2412 struct btrfs_qgroup_info_item, excl_cmpr, 64); 2413 2414 /* btrfs_qgroup_limit_item */ 2415 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item, 2416 flags, 64); 2417 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item, 2418 max_rfer, 64); 2419 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item, 2420 max_excl, 64); 2421 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item, 2422 rsv_rfer, 64); 2423 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item, 2424 rsv_excl, 64); 2425 2426 /* btrfs_dev_replace_item */ 2427 BTRFS_SETGET_FUNCS(dev_replace_src_devid, 2428 struct btrfs_dev_replace_item, src_devid, 64); 2429 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode, 2430 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode, 2431 64); 2432 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item, 2433 replace_state, 64); 2434 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item, 2435 time_started, 64); 2436 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item, 2437 time_stopped, 64); 2438 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item, 2439 num_write_errors, 64); 2440 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors, 2441 struct btrfs_dev_replace_item, num_uncorrectable_read_errors, 2442 64); 2443 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item, 2444 cursor_left, 64); 2445 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item, 2446 cursor_right, 64); 2447 2448 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid, 2449 struct btrfs_dev_replace_item, src_devid, 64); 2450 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode, 2451 struct btrfs_dev_replace_item, 2452 cont_reading_from_srcdev_mode, 64); 2453 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state, 2454 struct btrfs_dev_replace_item, replace_state, 64); 2455 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started, 2456 struct btrfs_dev_replace_item, time_started, 64); 2457 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped, 2458 struct btrfs_dev_replace_item, time_stopped, 64); 2459 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors, 2460 struct btrfs_dev_replace_item, num_write_errors, 64); 2461 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors, 2462 struct btrfs_dev_replace_item, 2463 num_uncorrectable_read_errors, 64); 2464 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left, 2465 struct btrfs_dev_replace_item, cursor_left, 64); 2466 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right, 2467 struct btrfs_dev_replace_item, cursor_right, 64); 2468 2469 /* helper function to cast into the data area of the leaf. */ 2470 #define btrfs_item_ptr(leaf, slot, type) \ 2471 ((type *)(BTRFS_LEAF_DATA_OFFSET + \ 2472 btrfs_item_offset_nr(leaf, slot))) 2473 2474 #define btrfs_item_ptr_offset(leaf, slot) \ 2475 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \ 2476 btrfs_item_offset_nr(leaf, slot))) 2477 2478 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length) 2479 { 2480 return crc32c(crc, address, length); 2481 } 2482 2483 static inline void btrfs_crc32c_final(u32 crc, u8 *result) 2484 { 2485 put_unaligned_le32(~crc, result); 2486 } 2487 2488 static inline u64 btrfs_name_hash(const char *name, int len) 2489 { 2490 return crc32c((u32)~1, name, len); 2491 } 2492 2493 /* 2494 * Figure the key offset of an extended inode ref 2495 */ 2496 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, 2497 int len) 2498 { 2499 return (u64) crc32c(parent_objectid, name, len); 2500 } 2501 2502 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping) 2503 { 2504 return mapping_gfp_constraint(mapping, ~__GFP_FS); 2505 } 2506 2507 /* extent-tree.c */ 2508 2509 enum btrfs_inline_ref_type { 2510 BTRFS_REF_TYPE_INVALID, 2511 BTRFS_REF_TYPE_BLOCK, 2512 BTRFS_REF_TYPE_DATA, 2513 BTRFS_REF_TYPE_ANY, 2514 }; 2515 2516 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb, 2517 struct btrfs_extent_inline_ref *iref, 2518 enum btrfs_inline_ref_type is_data); 2519 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset); 2520 2521 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes); 2522 2523 /* 2524 * Use this if we would be adding new items, as we could split nodes as we cow 2525 * down the tree. 2526 */ 2527 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info, 2528 unsigned num_items) 2529 { 2530 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items; 2531 } 2532 2533 /* 2534 * Doing a truncate or a modification won't result in new nodes or leaves, just 2535 * what we need for COW. 2536 */ 2537 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info, 2538 unsigned num_items) 2539 { 2540 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items; 2541 } 2542 2543 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info, 2544 u64 start, u64 num_bytes); 2545 void btrfs_free_excluded_extents(struct btrfs_block_group *cache); 2546 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 2547 unsigned long count); 2548 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info, 2549 struct btrfs_delayed_ref_root *delayed_refs, 2550 struct btrfs_delayed_ref_head *head); 2551 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len); 2552 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, 2553 struct btrfs_fs_info *fs_info, u64 bytenr, 2554 u64 offset, int metadata, u64 *refs, u64 *flags); 2555 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num, 2556 int reserved); 2557 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans, 2558 u64 bytenr, u64 num_bytes); 2559 int btrfs_exclude_logged_extents(struct extent_buffer *eb); 2560 int btrfs_cross_ref_exist(struct btrfs_root *root, 2561 u64 objectid, u64 offset, u64 bytenr, bool strict); 2562 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, 2563 struct btrfs_root *root, 2564 u64 parent, u64 root_objectid, 2565 const struct btrfs_disk_key *key, 2566 int level, u64 hint, 2567 u64 empty_size, 2568 enum btrfs_lock_nesting nest); 2569 void btrfs_free_tree_block(struct btrfs_trans_handle *trans, 2570 struct btrfs_root *root, 2571 struct extent_buffer *buf, 2572 u64 parent, int last_ref); 2573 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, 2574 struct btrfs_root *root, u64 owner, 2575 u64 offset, u64 ram_bytes, 2576 struct btrfs_key *ins); 2577 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, 2578 u64 root_objectid, u64 owner, u64 offset, 2579 struct btrfs_key *ins); 2580 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes, 2581 u64 min_alloc_size, u64 empty_size, u64 hint_byte, 2582 struct btrfs_key *ins, int is_data, int delalloc); 2583 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2584 struct extent_buffer *buf, int full_backref); 2585 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2586 struct extent_buffer *buf, int full_backref); 2587 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, 2588 struct extent_buffer *eb, u64 flags, 2589 int level, int is_data); 2590 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref); 2591 2592 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info, 2593 u64 start, u64 len, int delalloc); 2594 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start, 2595 u64 len); 2596 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info); 2597 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans); 2598 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 2599 struct btrfs_ref *generic_ref); 2600 2601 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr); 2602 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 2603 2604 /* 2605 * Different levels for to flush space when doing space reservations. 2606 * 2607 * The higher the level, the more methods we try to reclaim space. 2608 */ 2609 enum btrfs_reserve_flush_enum { 2610 /* If we are in the transaction, we can't flush anything.*/ 2611 BTRFS_RESERVE_NO_FLUSH, 2612 2613 /* 2614 * Flush space by: 2615 * - Running delayed inode items 2616 * - Allocating a new chunk 2617 */ 2618 BTRFS_RESERVE_FLUSH_LIMIT, 2619 2620 /* 2621 * Flush space by: 2622 * - Running delayed inode items 2623 * - Running delayed refs 2624 * - Running delalloc and waiting for ordered extents 2625 * - Allocating a new chunk 2626 */ 2627 BTRFS_RESERVE_FLUSH_EVICT, 2628 2629 /* 2630 * Flush space by above mentioned methods and by: 2631 * - Running delayed iputs 2632 * - Commiting transaction 2633 * 2634 * Can be interruped by fatal signal. 2635 */ 2636 BTRFS_RESERVE_FLUSH_DATA, 2637 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, 2638 BTRFS_RESERVE_FLUSH_ALL, 2639 2640 /* 2641 * Pretty much the same as FLUSH_ALL, but can also steal space from 2642 * global rsv. 2643 * 2644 * Can be interruped by fatal signal. 2645 */ 2646 BTRFS_RESERVE_FLUSH_ALL_STEAL, 2647 }; 2648 2649 enum btrfs_flush_state { 2650 FLUSH_DELAYED_ITEMS_NR = 1, 2651 FLUSH_DELAYED_ITEMS = 2, 2652 FLUSH_DELAYED_REFS_NR = 3, 2653 FLUSH_DELAYED_REFS = 4, 2654 FLUSH_DELALLOC = 5, 2655 FLUSH_DELALLOC_WAIT = 6, 2656 ALLOC_CHUNK = 7, 2657 ALLOC_CHUNK_FORCE = 8, 2658 RUN_DELAYED_IPUTS = 9, 2659 COMMIT_TRANS = 10, 2660 }; 2661 2662 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, 2663 struct btrfs_block_rsv *rsv, 2664 int nitems, bool use_global_rsv); 2665 void btrfs_subvolume_release_metadata(struct btrfs_root *root, 2666 struct btrfs_block_rsv *rsv); 2667 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes); 2668 2669 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes); 2670 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); 2671 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info, 2672 u64 start, u64 end); 2673 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr, 2674 u64 num_bytes, u64 *actual_bytes); 2675 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range); 2676 2677 int btrfs_init_space_info(struct btrfs_fs_info *fs_info); 2678 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, 2679 struct btrfs_fs_info *fs_info); 2680 int btrfs_start_write_no_snapshotting(struct btrfs_root *root); 2681 void btrfs_end_write_no_snapshotting(struct btrfs_root *root); 2682 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root); 2683 2684 /* ctree.c */ 2685 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key, 2686 int *slot); 2687 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2); 2688 int btrfs_previous_item(struct btrfs_root *root, 2689 struct btrfs_path *path, u64 min_objectid, 2690 int type); 2691 int btrfs_previous_extent_item(struct btrfs_root *root, 2692 struct btrfs_path *path, u64 min_objectid); 2693 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info, 2694 struct btrfs_path *path, 2695 const struct btrfs_key *new_key); 2696 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 2697 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 2698 struct btrfs_key *key, int lowest_level, 2699 u64 min_trans); 2700 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 2701 struct btrfs_path *path, 2702 u64 min_trans); 2703 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent, 2704 int slot); 2705 2706 int btrfs_cow_block(struct btrfs_trans_handle *trans, 2707 struct btrfs_root *root, struct extent_buffer *buf, 2708 struct extent_buffer *parent, int parent_slot, 2709 struct extent_buffer **cow_ret, 2710 enum btrfs_lock_nesting nest); 2711 int btrfs_copy_root(struct btrfs_trans_handle *trans, 2712 struct btrfs_root *root, 2713 struct extent_buffer *buf, 2714 struct extent_buffer **cow_ret, u64 new_root_objectid); 2715 int btrfs_block_can_be_shared(struct btrfs_root *root, 2716 struct extent_buffer *buf); 2717 void btrfs_extend_item(struct btrfs_path *path, u32 data_size); 2718 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end); 2719 int btrfs_split_item(struct btrfs_trans_handle *trans, 2720 struct btrfs_root *root, 2721 struct btrfs_path *path, 2722 const struct btrfs_key *new_key, 2723 unsigned long split_offset); 2724 int btrfs_duplicate_item(struct btrfs_trans_handle *trans, 2725 struct btrfs_root *root, 2726 struct btrfs_path *path, 2727 const struct btrfs_key *new_key); 2728 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path, 2729 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key); 2730 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2731 const struct btrfs_key *key, struct btrfs_path *p, 2732 int ins_len, int cow); 2733 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key, 2734 struct btrfs_path *p, u64 time_seq); 2735 int btrfs_search_slot_for_read(struct btrfs_root *root, 2736 const struct btrfs_key *key, 2737 struct btrfs_path *p, int find_higher, 2738 int return_any); 2739 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 2740 struct btrfs_root *root, struct extent_buffer *parent, 2741 int start_slot, u64 *last_ret, 2742 struct btrfs_key *progress); 2743 void btrfs_release_path(struct btrfs_path *p); 2744 struct btrfs_path *btrfs_alloc_path(void); 2745 void btrfs_free_path(struct btrfs_path *p); 2746 2747 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2748 struct btrfs_path *path, int slot, int nr); 2749 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 2750 struct btrfs_root *root, 2751 struct btrfs_path *path) 2752 { 2753 return btrfs_del_items(trans, root, path, path->slots[0], 1); 2754 } 2755 2756 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path, 2757 const struct btrfs_key *cpu_key, u32 *data_size, 2758 int nr); 2759 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2760 const struct btrfs_key *key, void *data, u32 data_size); 2761 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 2762 struct btrfs_root *root, 2763 struct btrfs_path *path, 2764 const struct btrfs_key *cpu_key, u32 *data_size, 2765 int nr); 2766 2767 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 2768 struct btrfs_root *root, 2769 struct btrfs_path *path, 2770 const struct btrfs_key *key, 2771 u32 data_size) 2772 { 2773 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 2774 } 2775 2776 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 2777 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 2778 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, 2779 u64 time_seq); 2780 static inline int btrfs_next_old_item(struct btrfs_root *root, 2781 struct btrfs_path *p, u64 time_seq) 2782 { 2783 ++p->slots[0]; 2784 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0])) 2785 return btrfs_next_old_leaf(root, p, time_seq); 2786 return 0; 2787 } 2788 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p) 2789 { 2790 return btrfs_next_old_item(root, p, 0); 2791 } 2792 int btrfs_leaf_free_space(struct extent_buffer *leaf); 2793 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref, 2794 int for_reloc); 2795 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 2796 struct btrfs_root *root, 2797 struct extent_buffer *node, 2798 struct extent_buffer *parent); 2799 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info) 2800 { 2801 /* 2802 * Do it this way so we only ever do one test_bit in the normal case. 2803 */ 2804 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) { 2805 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags)) 2806 return 2; 2807 return 1; 2808 } 2809 return 0; 2810 } 2811 2812 /* 2813 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do 2814 * anything except sleeping. This function is used to check the status of 2815 * the fs. 2816 */ 2817 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info) 2818 { 2819 return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info); 2820 } 2821 2822 /* tree mod log functions from ctree.c */ 2823 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info, 2824 struct seq_list *elem); 2825 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info, 2826 struct seq_list *elem); 2827 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq); 2828 2829 /* root-item.c */ 2830 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id, 2831 u64 ref_id, u64 dirid, u64 sequence, const char *name, 2832 int name_len); 2833 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id, 2834 u64 ref_id, u64 dirid, u64 *sequence, const char *name, 2835 int name_len); 2836 int btrfs_del_root(struct btrfs_trans_handle *trans, 2837 const struct btrfs_key *key); 2838 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2839 const struct btrfs_key *key, 2840 struct btrfs_root_item *item); 2841 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans, 2842 struct btrfs_root *root, 2843 struct btrfs_key *key, 2844 struct btrfs_root_item *item); 2845 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key, 2846 struct btrfs_path *path, struct btrfs_root_item *root_item, 2847 struct btrfs_key *root_key); 2848 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info); 2849 void btrfs_set_root_node(struct btrfs_root_item *item, 2850 struct extent_buffer *node); 2851 void btrfs_check_and_init_root_item(struct btrfs_root_item *item); 2852 void btrfs_update_root_times(struct btrfs_trans_handle *trans, 2853 struct btrfs_root *root); 2854 2855 /* uuid-tree.c */ 2856 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, 2857 u64 subid); 2858 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, 2859 u64 subid); 2860 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info); 2861 2862 /* dir-item.c */ 2863 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, 2864 const char *name, int name_len); 2865 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name, 2866 int name_len, struct btrfs_inode *dir, 2867 struct btrfs_key *location, u8 type, u64 index); 2868 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2869 struct btrfs_root *root, 2870 struct btrfs_path *path, u64 dir, 2871 const char *name, int name_len, 2872 int mod); 2873 struct btrfs_dir_item * 2874 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2875 struct btrfs_root *root, 2876 struct btrfs_path *path, u64 dir, 2877 u64 objectid, const char *name, int name_len, 2878 int mod); 2879 struct btrfs_dir_item * 2880 btrfs_search_dir_index_item(struct btrfs_root *root, 2881 struct btrfs_path *path, u64 dirid, 2882 const char *name, int name_len); 2883 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2884 struct btrfs_root *root, 2885 struct btrfs_path *path, 2886 struct btrfs_dir_item *di); 2887 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 2888 struct btrfs_root *root, 2889 struct btrfs_path *path, u64 objectid, 2890 const char *name, u16 name_len, 2891 const void *data, u16 data_len); 2892 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2893 struct btrfs_root *root, 2894 struct btrfs_path *path, u64 dir, 2895 const char *name, u16 name_len, 2896 int mod); 2897 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, 2898 struct btrfs_path *path, 2899 const char *name, 2900 int name_len); 2901 2902 /* orphan.c */ 2903 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 2904 struct btrfs_root *root, u64 offset); 2905 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 2906 struct btrfs_root *root, u64 offset); 2907 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset); 2908 2909 /* inode-item.c */ 2910 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 2911 struct btrfs_root *root, 2912 const char *name, int name_len, 2913 u64 inode_objectid, u64 ref_objectid, u64 index); 2914 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 2915 struct btrfs_root *root, 2916 const char *name, int name_len, 2917 u64 inode_objectid, u64 ref_objectid, u64 *index); 2918 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 2919 struct btrfs_root *root, 2920 struct btrfs_path *path, u64 objectid); 2921 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 2922 *root, struct btrfs_path *path, 2923 struct btrfs_key *location, int mod); 2924 2925 struct btrfs_inode_extref * 2926 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans, 2927 struct btrfs_root *root, 2928 struct btrfs_path *path, 2929 const char *name, int name_len, 2930 u64 inode_objectid, u64 ref_objectid, int ins_len, 2931 int cow); 2932 2933 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf, 2934 int slot, const char *name, 2935 int name_len); 2936 struct btrfs_inode_extref *btrfs_find_name_in_ext_backref( 2937 struct extent_buffer *leaf, int slot, u64 ref_objectid, 2938 const char *name, int name_len); 2939 /* file-item.c */ 2940 struct btrfs_dio_private; 2941 int btrfs_del_csums(struct btrfs_trans_handle *trans, 2942 struct btrfs_root *root, u64 bytenr, u64 len); 2943 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, 2944 u64 offset, u8 *dst); 2945 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 2946 struct btrfs_root *root, 2947 u64 objectid, u64 pos, 2948 u64 disk_offset, u64 disk_num_bytes, 2949 u64 num_bytes, u64 offset, u64 ram_bytes, 2950 u8 compression, u8 encryption, u16 other_encoding); 2951 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 2952 struct btrfs_root *root, 2953 struct btrfs_path *path, u64 objectid, 2954 u64 bytenr, int mod); 2955 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 2956 struct btrfs_root *root, 2957 struct btrfs_ordered_sum *sums); 2958 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, 2959 u64 file_start, int contig); 2960 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, 2961 struct list_head *list, int search_commit); 2962 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode, 2963 const struct btrfs_path *path, 2964 struct btrfs_file_extent_item *fi, 2965 const bool new_inline, 2966 struct extent_map *em); 2967 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start, 2968 u64 len); 2969 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start, 2970 u64 len); 2971 void btrfs_inode_safe_disk_i_size_write(struct inode *inode, u64 new_i_size); 2972 u64 btrfs_file_extent_end(const struct btrfs_path *path); 2973 2974 /* inode.c */ 2975 blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio, 2976 int mirror_num, unsigned long bio_flags); 2977 int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u64 phy_offset, 2978 struct page *page, u64 start, u64 end, int mirror); 2979 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode, 2980 u64 start, u64 len); 2981 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, 2982 u64 *orig_start, u64 *orig_block_len, 2983 u64 *ram_bytes, bool strict); 2984 2985 void __btrfs_del_delalloc_inode(struct btrfs_root *root, 2986 struct btrfs_inode *inode); 2987 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 2988 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index); 2989 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 2990 struct btrfs_root *root, 2991 struct btrfs_inode *dir, struct btrfs_inode *inode, 2992 const char *name, int name_len); 2993 int btrfs_add_link(struct btrfs_trans_handle *trans, 2994 struct btrfs_inode *parent_inode, struct btrfs_inode *inode, 2995 const char *name, int name_len, int add_backref, u64 index); 2996 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry); 2997 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len, 2998 int front); 2999 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 3000 struct btrfs_root *root, 3001 struct inode *inode, u64 new_size, 3002 u32 min_type); 3003 3004 int btrfs_start_delalloc_snapshot(struct btrfs_root *root); 3005 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr); 3006 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end, 3007 unsigned int extra_bits, 3008 struct extent_state **cached_state); 3009 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 3010 struct btrfs_root *new_root, 3011 struct btrfs_root *parent_root, 3012 u64 new_dirid); 3013 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state, 3014 unsigned *bits); 3015 void btrfs_clear_delalloc_extent(struct inode *inode, 3016 struct extent_state *state, unsigned *bits); 3017 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new, 3018 struct extent_state *other); 3019 void btrfs_split_delalloc_extent(struct inode *inode, 3020 struct extent_state *orig, u64 split); 3021 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio, 3022 unsigned long bio_flags); 3023 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end); 3024 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf); 3025 int btrfs_readpage(struct file *file, struct page *page); 3026 void btrfs_evict_inode(struct inode *inode); 3027 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc); 3028 struct inode *btrfs_alloc_inode(struct super_block *sb); 3029 void btrfs_destroy_inode(struct inode *inode); 3030 void btrfs_free_inode(struct inode *inode); 3031 int btrfs_drop_inode(struct inode *inode); 3032 int __init btrfs_init_cachep(void); 3033 void __cold btrfs_destroy_cachep(void); 3034 struct inode *btrfs_iget_path(struct super_block *s, u64 ino, 3035 struct btrfs_root *root, struct btrfs_path *path); 3036 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root); 3037 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, 3038 struct page *page, size_t pg_offset, 3039 u64 start, u64 end); 3040 int btrfs_update_inode(struct btrfs_trans_handle *trans, 3041 struct btrfs_root *root, 3042 struct inode *inode); 3043 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, 3044 struct btrfs_root *root, struct inode *inode); 3045 int btrfs_orphan_add(struct btrfs_trans_handle *trans, 3046 struct btrfs_inode *inode); 3047 int btrfs_orphan_cleanup(struct btrfs_root *root); 3048 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size); 3049 void btrfs_add_delayed_iput(struct inode *inode); 3050 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info); 3051 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info); 3052 int btrfs_prealloc_file_range(struct inode *inode, int mode, 3053 u64 start, u64 num_bytes, u64 min_size, 3054 loff_t actual_len, u64 *alloc_hint); 3055 int btrfs_prealloc_file_range_trans(struct inode *inode, 3056 struct btrfs_trans_handle *trans, int mode, 3057 u64 start, u64 num_bytes, u64 min_size, 3058 loff_t actual_len, u64 *alloc_hint); 3059 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page, 3060 u64 start, u64 end, int *page_started, unsigned long *nr_written, 3061 struct writeback_control *wbc); 3062 int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end); 3063 void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start, 3064 u64 end, int uptodate); 3065 extern const struct dentry_operations btrfs_dentry_operations; 3066 ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter); 3067 3068 /* ioctl.c */ 3069 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 3070 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 3071 int btrfs_ioctl_get_supported_features(void __user *arg); 3072 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode); 3073 int __pure btrfs_is_empty_uuid(u8 *uuid); 3074 int btrfs_defrag_file(struct inode *inode, struct file *file, 3075 struct btrfs_ioctl_defrag_range_args *range, 3076 u64 newer_than, unsigned long max_pages); 3077 void btrfs_get_block_group_info(struct list_head *groups_list, 3078 struct btrfs_ioctl_space_info *space); 3079 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3080 struct btrfs_ioctl_balance_args *bargs); 3081 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 3082 enum btrfs_exclusive_operation type); 3083 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info); 3084 3085 /* file.c */ 3086 int __init btrfs_auto_defrag_init(void); 3087 void __cold btrfs_auto_defrag_exit(void); 3088 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, 3089 struct btrfs_inode *inode); 3090 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info); 3091 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info); 3092 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync); 3093 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end, 3094 int skip_pinned); 3095 extern const struct file_operations btrfs_file_operations; 3096 int __btrfs_drop_extents(struct btrfs_trans_handle *trans, 3097 struct btrfs_root *root, struct btrfs_inode *inode, 3098 struct btrfs_path *path, u64 start, u64 end, 3099 u64 *drop_end, int drop_cache, 3100 int replace_extent, 3101 u32 extent_item_size, 3102 int *key_inserted); 3103 int btrfs_drop_extents(struct btrfs_trans_handle *trans, 3104 struct btrfs_root *root, struct inode *inode, u64 start, 3105 u64 end, int drop_cache); 3106 int btrfs_replace_file_extents(struct inode *inode, struct btrfs_path *path, 3107 const u64 start, const u64 end, 3108 struct btrfs_replace_extent_info *extent_info, 3109 struct btrfs_trans_handle **trans_out); 3110 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 3111 struct btrfs_inode *inode, u64 start, u64 end); 3112 int btrfs_release_file(struct inode *inode, struct file *file); 3113 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages, 3114 size_t num_pages, loff_t pos, size_t write_bytes, 3115 struct extent_state **cached); 3116 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end); 3117 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos, 3118 size_t *write_bytes); 3119 void btrfs_check_nocow_unlock(struct btrfs_inode *inode); 3120 3121 /* tree-defrag.c */ 3122 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 3123 struct btrfs_root *root); 3124 3125 /* super.c */ 3126 int btrfs_parse_options(struct btrfs_fs_info *info, char *options, 3127 unsigned long new_flags); 3128 int btrfs_sync_fs(struct super_block *sb, int wait); 3129 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 3130 u64 subvol_objectid); 3131 3132 static inline __printf(2, 3) __cold 3133 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 3134 { 3135 } 3136 3137 #ifdef CONFIG_PRINTK 3138 __printf(2, 3) 3139 __cold 3140 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...); 3141 #else 3142 #define btrfs_printk(fs_info, fmt, args...) \ 3143 btrfs_no_printk(fs_info, fmt, ##args) 3144 #endif 3145 3146 #define btrfs_emerg(fs_info, fmt, args...) \ 3147 btrfs_printk(fs_info, KERN_EMERG fmt, ##args) 3148 #define btrfs_alert(fs_info, fmt, args...) \ 3149 btrfs_printk(fs_info, KERN_ALERT fmt, ##args) 3150 #define btrfs_crit(fs_info, fmt, args...) \ 3151 btrfs_printk(fs_info, KERN_CRIT fmt, ##args) 3152 #define btrfs_err(fs_info, fmt, args...) \ 3153 btrfs_printk(fs_info, KERN_ERR fmt, ##args) 3154 #define btrfs_warn(fs_info, fmt, args...) \ 3155 btrfs_printk(fs_info, KERN_WARNING fmt, ##args) 3156 #define btrfs_notice(fs_info, fmt, args...) \ 3157 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args) 3158 #define btrfs_info(fs_info, fmt, args...) \ 3159 btrfs_printk(fs_info, KERN_INFO fmt, ##args) 3160 3161 /* 3162 * Wrappers that use printk_in_rcu 3163 */ 3164 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \ 3165 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args) 3166 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \ 3167 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args) 3168 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \ 3169 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args) 3170 #define btrfs_err_in_rcu(fs_info, fmt, args...) \ 3171 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args) 3172 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \ 3173 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args) 3174 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \ 3175 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args) 3176 #define btrfs_info_in_rcu(fs_info, fmt, args...) \ 3177 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args) 3178 3179 /* 3180 * Wrappers that use a ratelimited printk_in_rcu 3181 */ 3182 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \ 3183 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args) 3184 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \ 3185 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args) 3186 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \ 3187 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args) 3188 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \ 3189 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args) 3190 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \ 3191 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args) 3192 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \ 3193 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args) 3194 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \ 3195 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args) 3196 3197 /* 3198 * Wrappers that use a ratelimited printk 3199 */ 3200 #define btrfs_emerg_rl(fs_info, fmt, args...) \ 3201 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args) 3202 #define btrfs_alert_rl(fs_info, fmt, args...) \ 3203 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args) 3204 #define btrfs_crit_rl(fs_info, fmt, args...) \ 3205 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args) 3206 #define btrfs_err_rl(fs_info, fmt, args...) \ 3207 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args) 3208 #define btrfs_warn_rl(fs_info, fmt, args...) \ 3209 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args) 3210 #define btrfs_notice_rl(fs_info, fmt, args...) \ 3211 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args) 3212 #define btrfs_info_rl(fs_info, fmt, args...) \ 3213 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args) 3214 3215 #if defined(CONFIG_DYNAMIC_DEBUG) 3216 #define btrfs_debug(fs_info, fmt, args...) \ 3217 _dynamic_func_call_no_desc(fmt, btrfs_printk, \ 3218 fs_info, KERN_DEBUG fmt, ##args) 3219 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3220 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \ 3221 fs_info, KERN_DEBUG fmt, ##args) 3222 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3223 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \ 3224 fs_info, KERN_DEBUG fmt, ##args) 3225 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3226 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \ 3227 fs_info, KERN_DEBUG fmt, ##args) 3228 #elif defined(DEBUG) 3229 #define btrfs_debug(fs_info, fmt, args...) \ 3230 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args) 3231 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3232 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3233 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3234 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3235 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3236 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args) 3237 #else 3238 #define btrfs_debug(fs_info, fmt, args...) \ 3239 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args) 3240 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3241 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3242 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3243 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3244 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3245 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args) 3246 #endif 3247 3248 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \ 3249 do { \ 3250 rcu_read_lock(); \ 3251 btrfs_printk(fs_info, fmt, ##args); \ 3252 rcu_read_unlock(); \ 3253 } while (0) 3254 3255 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \ 3256 do { \ 3257 rcu_read_lock(); \ 3258 btrfs_no_printk(fs_info, fmt, ##args); \ 3259 rcu_read_unlock(); \ 3260 } while (0) 3261 3262 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \ 3263 do { \ 3264 static DEFINE_RATELIMIT_STATE(_rs, \ 3265 DEFAULT_RATELIMIT_INTERVAL, \ 3266 DEFAULT_RATELIMIT_BURST); \ 3267 if (__ratelimit(&_rs)) \ 3268 btrfs_printk(fs_info, fmt, ##args); \ 3269 } while (0) 3270 3271 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \ 3272 do { \ 3273 rcu_read_lock(); \ 3274 btrfs_printk_ratelimited(fs_info, fmt, ##args); \ 3275 rcu_read_unlock(); \ 3276 } while (0) 3277 3278 #ifdef CONFIG_BTRFS_ASSERT 3279 __cold __noreturn 3280 static inline void assertfail(const char *expr, const char *file, int line) 3281 { 3282 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line); 3283 BUG(); 3284 } 3285 3286 #define ASSERT(expr) \ 3287 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__)) 3288 3289 #else 3290 static inline void assertfail(const char *expr, const char* file, int line) { } 3291 #define ASSERT(expr) (void)(expr) 3292 #endif 3293 3294 /* 3295 * Use that for functions that are conditionally exported for sanity tests but 3296 * otherwise static 3297 */ 3298 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3299 #define EXPORT_FOR_TESTS static 3300 #else 3301 #define EXPORT_FOR_TESTS 3302 #endif 3303 3304 __cold 3305 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info) 3306 { 3307 btrfs_err(fs_info, 3308 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel"); 3309 } 3310 3311 __printf(5, 6) 3312 __cold 3313 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 3314 unsigned int line, int errno, const char *fmt, ...); 3315 3316 const char * __attribute_const__ btrfs_decode_error(int errno); 3317 3318 __cold 3319 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 3320 const char *function, 3321 unsigned int line, int errno); 3322 3323 /* 3324 * Call btrfs_abort_transaction as early as possible when an error condition is 3325 * detected, that way the exact line number is reported. 3326 */ 3327 #define btrfs_abort_transaction(trans, errno) \ 3328 do { \ 3329 /* Report first abort since mount */ \ 3330 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \ 3331 &((trans)->fs_info->fs_state))) { \ 3332 if ((errno) != -EIO && (errno) != -EROFS) { \ 3333 WARN(1, KERN_DEBUG \ 3334 "BTRFS: Transaction aborted (error %d)\n", \ 3335 (errno)); \ 3336 } else { \ 3337 btrfs_debug((trans)->fs_info, \ 3338 "Transaction aborted (error %d)", \ 3339 (errno)); \ 3340 } \ 3341 } \ 3342 __btrfs_abort_transaction((trans), __func__, \ 3343 __LINE__, (errno)); \ 3344 } while (0) 3345 3346 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \ 3347 do { \ 3348 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \ 3349 (errno), fmt, ##args); \ 3350 } while (0) 3351 3352 __printf(5, 6) 3353 __cold 3354 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 3355 unsigned int line, int errno, const char *fmt, ...); 3356 /* 3357 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic 3358 * will panic(). Otherwise we BUG() here. 3359 */ 3360 #define btrfs_panic(fs_info, errno, fmt, args...) \ 3361 do { \ 3362 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \ 3363 BUG(); \ 3364 } while (0) 3365 3366 3367 /* compatibility and incompatibility defines */ 3368 3369 #define btrfs_set_fs_incompat(__fs_info, opt) \ 3370 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \ 3371 #opt) 3372 3373 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, 3374 u64 flag, const char* name) 3375 { 3376 struct btrfs_super_block *disk_super; 3377 u64 features; 3378 3379 disk_super = fs_info->super_copy; 3380 features = btrfs_super_incompat_flags(disk_super); 3381 if (!(features & flag)) { 3382 spin_lock(&fs_info->super_lock); 3383 features = btrfs_super_incompat_flags(disk_super); 3384 if (!(features & flag)) { 3385 features |= flag; 3386 btrfs_set_super_incompat_flags(disk_super, features); 3387 btrfs_info(fs_info, 3388 "setting incompat feature flag for %s (0x%llx)", 3389 name, flag); 3390 } 3391 spin_unlock(&fs_info->super_lock); 3392 } 3393 } 3394 3395 #define btrfs_clear_fs_incompat(__fs_info, opt) \ 3396 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \ 3397 #opt) 3398 3399 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, 3400 u64 flag, const char* name) 3401 { 3402 struct btrfs_super_block *disk_super; 3403 u64 features; 3404 3405 disk_super = fs_info->super_copy; 3406 features = btrfs_super_incompat_flags(disk_super); 3407 if (features & flag) { 3408 spin_lock(&fs_info->super_lock); 3409 features = btrfs_super_incompat_flags(disk_super); 3410 if (features & flag) { 3411 features &= ~flag; 3412 btrfs_set_super_incompat_flags(disk_super, features); 3413 btrfs_info(fs_info, 3414 "clearing incompat feature flag for %s (0x%llx)", 3415 name, flag); 3416 } 3417 spin_unlock(&fs_info->super_lock); 3418 } 3419 } 3420 3421 #define btrfs_fs_incompat(fs_info, opt) \ 3422 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3423 3424 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag) 3425 { 3426 struct btrfs_super_block *disk_super; 3427 disk_super = fs_info->super_copy; 3428 return !!(btrfs_super_incompat_flags(disk_super) & flag); 3429 } 3430 3431 #define btrfs_set_fs_compat_ro(__fs_info, opt) \ 3432 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \ 3433 #opt) 3434 3435 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, 3436 u64 flag, const char *name) 3437 { 3438 struct btrfs_super_block *disk_super; 3439 u64 features; 3440 3441 disk_super = fs_info->super_copy; 3442 features = btrfs_super_compat_ro_flags(disk_super); 3443 if (!(features & flag)) { 3444 spin_lock(&fs_info->super_lock); 3445 features = btrfs_super_compat_ro_flags(disk_super); 3446 if (!(features & flag)) { 3447 features |= flag; 3448 btrfs_set_super_compat_ro_flags(disk_super, features); 3449 btrfs_info(fs_info, 3450 "setting compat-ro feature flag for %s (0x%llx)", 3451 name, flag); 3452 } 3453 spin_unlock(&fs_info->super_lock); 3454 } 3455 } 3456 3457 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \ 3458 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \ 3459 #opt) 3460 3461 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, 3462 u64 flag, const char *name) 3463 { 3464 struct btrfs_super_block *disk_super; 3465 u64 features; 3466 3467 disk_super = fs_info->super_copy; 3468 features = btrfs_super_compat_ro_flags(disk_super); 3469 if (features & flag) { 3470 spin_lock(&fs_info->super_lock); 3471 features = btrfs_super_compat_ro_flags(disk_super); 3472 if (features & flag) { 3473 features &= ~flag; 3474 btrfs_set_super_compat_ro_flags(disk_super, features); 3475 btrfs_info(fs_info, 3476 "clearing compat-ro feature flag for %s (0x%llx)", 3477 name, flag); 3478 } 3479 spin_unlock(&fs_info->super_lock); 3480 } 3481 } 3482 3483 #define btrfs_fs_compat_ro(fs_info, opt) \ 3484 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 3485 3486 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag) 3487 { 3488 struct btrfs_super_block *disk_super; 3489 disk_super = fs_info->super_copy; 3490 return !!(btrfs_super_compat_ro_flags(disk_super) & flag); 3491 } 3492 3493 /* acl.c */ 3494 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 3495 struct posix_acl *btrfs_get_acl(struct inode *inode, int type); 3496 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type); 3497 int btrfs_init_acl(struct btrfs_trans_handle *trans, 3498 struct inode *inode, struct inode *dir); 3499 #else 3500 #define btrfs_get_acl NULL 3501 #define btrfs_set_acl NULL 3502 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans, 3503 struct inode *inode, struct inode *dir) 3504 { 3505 return 0; 3506 } 3507 #endif 3508 3509 /* relocation.c */ 3510 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start); 3511 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 3512 struct btrfs_root *root); 3513 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 3514 struct btrfs_root *root); 3515 int btrfs_recover_relocation(struct btrfs_root *root); 3516 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len); 3517 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 3518 struct btrfs_root *root, struct extent_buffer *buf, 3519 struct extent_buffer *cow); 3520 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, 3521 u64 *bytes_to_reserve); 3522 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 3523 struct btrfs_pending_snapshot *pending); 3524 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info); 3525 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info, 3526 u64 bytenr); 3527 int btrfs_should_ignore_reloc_root(struct btrfs_root *root); 3528 3529 /* scrub.c */ 3530 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, 3531 u64 end, struct btrfs_scrub_progress *progress, 3532 int readonly, int is_dev_replace); 3533 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info); 3534 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info); 3535 int btrfs_scrub_cancel(struct btrfs_fs_info *info); 3536 int btrfs_scrub_cancel_dev(struct btrfs_device *dev); 3537 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid, 3538 struct btrfs_scrub_progress *progress); 3539 static inline void btrfs_init_full_stripe_locks_tree( 3540 struct btrfs_full_stripe_locks_tree *locks_root) 3541 { 3542 locks_root->root = RB_ROOT; 3543 mutex_init(&locks_root->lock); 3544 } 3545 3546 /* dev-replace.c */ 3547 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info); 3548 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info); 3549 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount); 3550 3551 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info) 3552 { 3553 btrfs_bio_counter_sub(fs_info, 1); 3554 } 3555 3556 /* reada.c */ 3557 struct reada_control { 3558 struct btrfs_fs_info *fs_info; /* tree to prefetch */ 3559 struct btrfs_key key_start; 3560 struct btrfs_key key_end; /* exclusive */ 3561 atomic_t elems; 3562 struct kref refcnt; 3563 wait_queue_head_t wait; 3564 }; 3565 struct reada_control *btrfs_reada_add(struct btrfs_root *root, 3566 struct btrfs_key *start, struct btrfs_key *end); 3567 int btrfs_reada_wait(void *handle); 3568 void btrfs_reada_detach(void *handle); 3569 int btree_readahead_hook(struct extent_buffer *eb, int err); 3570 void btrfs_reada_remove_dev(struct btrfs_device *dev); 3571 void btrfs_reada_undo_remove_dev(struct btrfs_device *dev); 3572 3573 static inline int is_fstree(u64 rootid) 3574 { 3575 if (rootid == BTRFS_FS_TREE_OBJECTID || 3576 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID && 3577 !btrfs_qgroup_level(rootid))) 3578 return 1; 3579 return 0; 3580 } 3581 3582 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info) 3583 { 3584 return signal_pending(current); 3585 } 3586 3587 #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len)) 3588 3589 /* Sanity test specific functions */ 3590 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3591 void btrfs_test_destroy_inode(struct inode *inode); 3592 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info) 3593 { 3594 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state); 3595 } 3596 #else 3597 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info) 3598 { 3599 return 0; 3600 } 3601 #endif 3602 3603 #endif 3604