1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2007 Oracle. All rights reserved.
10 #include <linux/sched/signal.h>
11 #include <linux/highmem.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/unaligned.h>
21 #include <linux/pagemap.h>
22 #include <linux/btrfs.h>
23 #include <linux/btrfs_tree.h>
24 #include <linux/workqueue.h>
25 #include <linux/security.h>
26 #include <linux/sizes.h>
27 #include <linux/dynamic_debug.h>
28 #include <linux/refcount.h>
29 #include <linux/crc32c.h>
30 #include <linux/iomap.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"
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;
52 struct btrfs_ioctl_encoded_io_args;
54 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
57 * Maximum number of mirrors that can be available for all profiles counting
58 * the target device of dev-replace as one. During an active device replace
59 * procedure, the target device of the copy operation is a mirror for the
60 * filesystem data as well that can be used to read data in order to repair
61 * read errors on other disks.
63 * Current value is derived from RAID1C4 with 4 copies.
65 #define BTRFS_MAX_MIRRORS (4 + 1)
67 #define BTRFS_MAX_LEVEL 8
69 #define BTRFS_OLDEST_GENERATION 0ULL
72 * we can actually store much bigger names, but lets not confuse the rest
75 #define BTRFS_NAME_LEN 255
78 * Theoretical limit is larger, but we keep this down to a sane
79 * value. That should limit greatly the possibility of collisions on
82 #define BTRFS_LINK_MAX 65535U
84 #define BTRFS_EMPTY_DIR_SIZE 0
86 /* ioprio of readahead is set to idle */
87 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
89 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M
92 * Use large batch size to reduce overhead of metadata updates. On the reader
93 * side, we only read it when we are close to ENOSPC and the read overhead is
94 * mostly related to the number of CPUs, so it is OK to use arbitrary large
97 #define BTRFS_TOTAL_BYTES_PINNED_BATCH SZ_128M
99 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
102 * Deltas are an effective way to populate global statistics. Give macro names
103 * to make it clear what we're doing. An example is discard_extents in
104 * btrfs_free_space_ctl.
106 #define BTRFS_STAT_NR_ENTRIES 2
107 #define BTRFS_STAT_CURR 0
108 #define BTRFS_STAT_PREV 1
111 * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
113 static inline u32 count_max_extents(u64 size)
115 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
118 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
120 BUG_ON(num_stripes == 0);
121 return sizeof(struct btrfs_chunk) +
122 sizeof(struct btrfs_stripe) * (num_stripes - 1);
126 * Runtime (in-memory) states of filesystem
129 /* Global indicator of serious filesystem errors */
130 BTRFS_FS_STATE_ERROR,
132 * Filesystem is being remounted, allow to skip some operations, like
135 BTRFS_FS_STATE_REMOUNTING,
136 /* Filesystem in RO mode */
138 /* Track if a transaction abort has been reported on this filesystem */
139 BTRFS_FS_STATE_TRANS_ABORTED,
141 * Bio operations should be blocked on this filesystem because a source
142 * or target device is being destroyed as part of a device replace
144 BTRFS_FS_STATE_DEV_REPLACING,
145 /* The btrfs_fs_info created for self-tests */
146 BTRFS_FS_STATE_DUMMY_FS_INFO,
148 BTRFS_FS_STATE_NO_CSUMS,
150 /* Indicates there was an error cleaning up a log tree. */
151 BTRFS_FS_STATE_LOG_CLEANUP_ERROR,
156 #define BTRFS_BACKREF_REV_MAX 256
157 #define BTRFS_BACKREF_REV_SHIFT 56
158 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
159 BTRFS_BACKREF_REV_SHIFT)
161 #define BTRFS_OLD_BACKREF_REV 0
162 #define BTRFS_MIXED_BACKREF_REV 1
165 * every tree block (leaf or node) starts with this header.
167 struct btrfs_header {
168 /* these first four must match the super block */
169 u8 csum[BTRFS_CSUM_SIZE];
170 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
171 __le64 bytenr; /* which block this node is supposed to live in */
174 /* allowed to be different from the super from here on down */
175 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
180 } __attribute__ ((__packed__));
183 * this is a very generous portion of the super block, giving us
184 * room to translate 14 chunks with 3 stripes each.
186 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
189 * just in case we somehow lose the roots and are not able to mount,
190 * we store an array of the roots from previous transactions
193 #define BTRFS_NUM_BACKUP_ROOTS 4
194 struct btrfs_root_backup {
196 __le64 tree_root_gen;
199 __le64 chunk_root_gen;
202 __le64 extent_root_gen;
211 __le64 csum_root_gen;
221 u8 extent_root_level;
225 /* future and to align */
227 } __attribute__ ((__packed__));
229 #define BTRFS_SUPER_INFO_OFFSET SZ_64K
230 #define BTRFS_SUPER_INFO_SIZE 4096
233 * the super block basically lists the main trees of the FS
234 * it currently lacks any block count etc etc
236 struct btrfs_super_block {
237 /* the first 4 fields must match struct btrfs_header */
238 u8 csum[BTRFS_CSUM_SIZE];
239 /* FS specific UUID, visible to user */
240 u8 fsid[BTRFS_FSID_SIZE];
241 __le64 bytenr; /* this block number */
244 /* allowed to be different from the btrfs_header from here own down */
251 /* this will help find the new super based on the log root */
252 __le64 log_root_transid;
255 __le64 root_dir_objectid;
259 __le32 __unused_leafsize;
261 __le32 sys_chunk_array_size;
262 __le64 chunk_root_generation;
264 __le64 compat_ro_flags;
265 __le64 incompat_flags;
270 struct btrfs_dev_item dev_item;
272 char label[BTRFS_LABEL_SIZE];
274 __le64 cache_generation;
275 __le64 uuid_tree_generation;
277 /* the UUID written into btree blocks */
278 u8 metadata_uuid[BTRFS_FSID_SIZE];
281 __le64 block_group_root;
282 __le64 block_group_root_generation;
283 u8 block_group_root_level;
285 /* future expansion */
288 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
289 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
291 /* Padded to 4096 bytes */
293 } __attribute__ ((__packed__));
294 static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE);
297 * Compat flags that we support. If any incompat flags are set other than the
298 * ones specified below then we will fail to mount
300 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
301 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
302 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
304 #define BTRFS_FEATURE_COMPAT_RO_SUPP \
305 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
306 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
307 BTRFS_FEATURE_COMPAT_RO_VERITY)
309 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
310 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
312 #ifdef CONFIG_BTRFS_DEBUG
314 * Extent tree v2 supported only with CONFIG_BTRFS_DEBUG
316 #define BTRFS_FEATURE_INCOMPAT_SUPP \
317 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
318 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
319 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
320 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
321 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
322 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
323 BTRFS_FEATURE_INCOMPAT_RAID56 | \
324 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
325 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
326 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
327 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
328 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
329 BTRFS_FEATURE_INCOMPAT_ZONED | \
330 BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2)
332 #define BTRFS_FEATURE_INCOMPAT_SUPP \
333 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
334 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
335 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
336 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
337 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
338 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
339 BTRFS_FEATURE_INCOMPAT_RAID56 | \
340 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
341 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
342 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
343 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
344 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
345 BTRFS_FEATURE_INCOMPAT_ZONED)
348 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
349 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
350 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
353 * A leaf is full of items. offset and size tell us where to find
354 * the item in the leaf (relative to the start of the data area)
357 struct btrfs_disk_key key;
360 } __attribute__ ((__packed__));
363 * leaves have an item area and a data area:
364 * [item0, item1....itemN] [free space] [dataN...data1, data0]
366 * The data is separate from the items to get the keys closer together
370 struct btrfs_header header;
371 struct btrfs_item items[];
372 } __attribute__ ((__packed__));
375 * all non-leaf blocks are nodes, they hold only keys and pointers to
378 struct btrfs_key_ptr {
379 struct btrfs_disk_key key;
382 } __attribute__ ((__packed__));
385 struct btrfs_header header;
386 struct btrfs_key_ptr ptrs[];
387 } __attribute__ ((__packed__));
389 /* Read ahead values for struct btrfs_path.reada */
395 * Similar to READA_FORWARD but unlike it:
397 * 1) It will trigger readahead even for leaves that are not close to
398 * each other on disk;
399 * 2) It also triggers readahead for nodes;
400 * 3) During a search, even when a node or leaf is already in memory, it
401 * will still trigger readahead for other nodes and leaves that follow
404 * This is meant to be used only when we know we are iterating over the
405 * entire tree or a very large part of it.
407 READA_FORWARD_ALWAYS,
411 * btrfs_paths remember the path taken from the root down to the leaf.
412 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
413 * to any other levels that are present.
415 * The slots array records the index of the item or block pointer
416 * used while walking the tree.
419 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
420 int slots[BTRFS_MAX_LEVEL];
421 /* if there is real range locking, this locks field will change */
422 u8 locks[BTRFS_MAX_LEVEL];
424 /* keep some upper locks as we walk down */
428 * set by btrfs_split_item, tells search_slot to keep all locks
429 * and to force calls to keep space in the nodes
431 unsigned int search_for_split:1;
432 unsigned int keep_locks:1;
433 unsigned int skip_locking:1;
434 unsigned int search_commit_root:1;
435 unsigned int need_commit_sem:1;
436 unsigned int skip_release_on_error:1;
438 * Indicate that new item (btrfs_search_slot) is extending already
439 * existing item and ins_len contains only the data size and not item
440 * header (ie. sizeof(struct btrfs_item) is not included).
442 unsigned int search_for_extension:1;
444 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
445 sizeof(struct btrfs_item))
446 struct btrfs_dev_replace {
447 u64 replace_state; /* see #define above */
448 time64_t time_started; /* seconds since 1-Jan-1970 */
449 time64_t time_stopped; /* seconds since 1-Jan-1970 */
450 atomic64_t num_write_errors;
451 atomic64_t num_uncorrectable_read_errors;
454 u64 committed_cursor_left;
455 u64 cursor_left_last_write_of_item;
458 u64 cont_reading_from_srcdev_mode; /* see #define above */
461 int item_needs_writeback;
462 struct btrfs_device *srcdev;
463 struct btrfs_device *tgtdev;
465 struct mutex lock_finishing_cancel_unmount;
466 struct rw_semaphore rwsem;
468 struct btrfs_scrub_progress scrub_progress;
470 struct percpu_counter bio_counter;
471 wait_queue_head_t replace_wait;
475 * free clusters are used to claim free space in relatively large chunks,
476 * allowing us to do less seeky writes. They are used for all metadata
477 * allocations. In ssd_spread mode they are also used for data allocations.
479 struct btrfs_free_cluster {
481 spinlock_t refill_lock;
484 /* largest extent in this cluster */
487 /* first extent starting offset */
490 /* We did a full search and couldn't create a cluster */
493 struct btrfs_block_group *block_group;
495 * when a cluster is allocated from a block group, we put the
496 * cluster onto a list in the block group so that it can
497 * be freed before the block group is freed.
499 struct list_head block_group_list;
502 enum btrfs_caching_type {
506 BTRFS_CACHE_FINISHED,
511 * Tree to record all locked full stripes of a RAID5/6 block group
513 struct btrfs_full_stripe_locks_tree {
518 /* Discard control. */
520 * Async discard uses multiple lists to differentiate the discard filter
521 * parameters. Index 0 is for completely free block groups where we need to
522 * ensure the entire block group is trimmed without being lossy. Indices
523 * afterwards represent monotonically decreasing discard filter sizes to
524 * prioritize what should be discarded next.
526 #define BTRFS_NR_DISCARD_LISTS 3
527 #define BTRFS_DISCARD_INDEX_UNUSED 0
528 #define BTRFS_DISCARD_INDEX_START 1
530 struct btrfs_discard_ctl {
531 struct workqueue_struct *discard_workers;
532 struct delayed_work work;
534 struct btrfs_block_group *block_group;
535 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
537 u64 prev_discard_time;
538 atomic_t discardable_extents;
539 atomic64_t discardable_bytes;
540 u64 max_discard_size;
544 u64 discard_extent_bytes;
545 u64 discard_bitmap_bytes;
546 atomic64_t discard_bytes_saved;
549 void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
552 struct reloc_control;
554 struct btrfs_fs_devices;
555 struct btrfs_balance_control;
556 struct btrfs_delayed_root;
559 * Block group or device which contains an active swapfile. Used for preventing
560 * unsafe operations while a swapfile is active.
562 * These are sorted on (ptr, inode) (note that a block group or device can
563 * contain more than one swapfile). We compare the pointer values because we
564 * don't actually care what the object is, we just need a quick check whether
565 * the object exists in the rbtree.
567 struct btrfs_swapfile_pin {
572 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
573 * points to a struct btrfs_device.
577 * Only used when 'is_block_group' is true and it is the number of
578 * extents used by a swapfile for this block group ('ptr' field).
583 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
586 BTRFS_FS_CLOSING_START,
587 BTRFS_FS_CLOSING_DONE,
588 BTRFS_FS_LOG_RECOVERING,
590 BTRFS_FS_QUOTA_ENABLED,
591 BTRFS_FS_UPDATE_UUID_TREE_GEN,
592 BTRFS_FS_CREATING_FREE_SPACE_TREE,
596 BTRFS_FS_QUOTA_OVERRIDE,
597 /* Used to record internally whether fs has been frozen */
600 * Indicate that balance has been set up from the ioctl and is in the
601 * main phase. The fs_info::balance_ctl is initialized.
603 BTRFS_FS_BALANCE_RUNNING,
606 * Indicate that relocation of a chunk has started, it's set per chunk
607 * and is toggled between chunks.
609 BTRFS_FS_RELOC_RUNNING,
611 /* Indicate that the cleaner thread is awake and doing something. */
612 BTRFS_FS_CLEANER_RUNNING,
615 * The checksumming has an optimized version and is considered fast,
616 * so we don't need to offload checksums to workqueues.
618 BTRFS_FS_CSUM_IMPL_FAST,
620 /* Indicate that the discard workqueue can service discards. */
621 BTRFS_FS_DISCARD_RUNNING,
623 /* Indicate that we need to cleanup space cache v1 */
624 BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
626 /* Indicate that we can't trust the free space tree for caching yet */
627 BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
629 /* Indicate whether there are any tree modification log users */
630 BTRFS_FS_TREE_MOD_LOG_USERS,
632 /* Indicate that we want the transaction kthread to commit right now. */
633 BTRFS_FS_COMMIT_TRANS,
635 /* Indicate we have half completed snapshot deletions pending. */
636 BTRFS_FS_UNFINISHED_DROPS,
638 #if BITS_PER_LONG == 32
639 /* Indicate if we have error/warn message printed on 32bit systems */
640 BTRFS_FS_32BIT_ERROR,
646 * Exclusive operations (device replace, resize, device add/remove, balance)
648 enum btrfs_exclusive_operation {
650 BTRFS_EXCLOP_BALANCE_PAUSED,
651 BTRFS_EXCLOP_BALANCE,
652 BTRFS_EXCLOP_DEV_ADD,
653 BTRFS_EXCLOP_DEV_REMOVE,
654 BTRFS_EXCLOP_DEV_REPLACE,
656 BTRFS_EXCLOP_SWAP_ACTIVATE,
659 struct btrfs_fs_info {
660 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
662 struct btrfs_root *tree_root;
663 struct btrfs_root *chunk_root;
664 struct btrfs_root *dev_root;
665 struct btrfs_root *fs_root;
666 struct btrfs_root *quota_root;
667 struct btrfs_root *uuid_root;
668 struct btrfs_root *data_reloc_root;
669 struct btrfs_root *block_group_root;
671 /* the log root tree is a directory of all the other log roots */
672 struct btrfs_root *log_root_tree;
674 /* The tree that holds the global roots (csum, extent, etc) */
675 rwlock_t global_root_lock;
676 struct rb_root global_root_tree;
678 /* The xarray that holds all the FS roots */
679 spinlock_t fs_roots_lock;
680 struct xarray fs_roots;
682 /* block group cache stuff */
683 rwlock_t block_group_cache_lock;
684 struct rb_root_cached block_group_cache_tree;
686 /* keep track of unallocated space */
687 atomic64_t free_chunk_space;
689 /* Track ranges which are used by log trees blocks/logged data extents */
690 struct extent_io_tree excluded_extents;
692 /* logical->physical extent mapping */
693 struct extent_map_tree mapping_tree;
696 * block reservation for extent, checksum, root tree and
697 * delayed dir index item
699 struct btrfs_block_rsv global_block_rsv;
700 /* block reservation for metadata operations */
701 struct btrfs_block_rsv trans_block_rsv;
702 /* block reservation for chunk tree */
703 struct btrfs_block_rsv chunk_block_rsv;
704 /* block reservation for delayed operations */
705 struct btrfs_block_rsv delayed_block_rsv;
706 /* block reservation for delayed refs */
707 struct btrfs_block_rsv delayed_refs_rsv;
709 struct btrfs_block_rsv empty_block_rsv;
712 u64 last_trans_committed;
714 * Generation of the last transaction used for block group relocation
715 * since the filesystem was last mounted (or 0 if none happened yet).
716 * Must be written and read while holding btrfs_fs_info::commit_root_sem.
718 u64 last_reloc_trans;
719 u64 avg_delayed_ref_runtime;
722 * this is updated to the current trans every time a full commit
723 * is required instead of the faster short fsync log commits
725 u64 last_trans_log_full_commit;
726 unsigned long mount_opt;
728 * Track requests for actions that need to be done during transaction
729 * commit (like for some mount options).
731 unsigned long pending_changes;
732 unsigned long compress_type:4;
733 unsigned int compress_level;
736 * It is a suggestive number, the read side is safe even it gets a
737 * wrong number because we will write out the data into a regular
738 * extent. The write side(mount/remount) is under ->s_umount lock,
739 * so it is also safe.
743 struct btrfs_transaction *running_transaction;
744 wait_queue_head_t transaction_throttle;
745 wait_queue_head_t transaction_wait;
746 wait_queue_head_t transaction_blocked_wait;
747 wait_queue_head_t async_submit_wait;
750 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
751 * when they are updated.
753 * Because we do not clear the flags for ever, so we needn't use
754 * the lock on the read side.
756 * We also needn't use the lock when we mount the fs, because
757 * there is no other task which will update the flag.
759 spinlock_t super_lock;
760 struct btrfs_super_block *super_copy;
761 struct btrfs_super_block *super_for_commit;
762 struct super_block *sb;
763 struct inode *btree_inode;
764 struct mutex tree_log_mutex;
765 struct mutex transaction_kthread_mutex;
766 struct mutex cleaner_mutex;
767 struct mutex chunk_mutex;
770 * this is taken to make sure we don't set block groups ro after
771 * the free space cache has been allocated on them
773 struct mutex ro_block_group_mutex;
775 /* this is used during read/modify/write to make sure
776 * no two ios are trying to mod the same stripe at the same
779 struct btrfs_stripe_hash_table *stripe_hash_table;
782 * this protects the ordered operations list only while we are
783 * processing all of the entries on it. This way we make
784 * sure the commit code doesn't find the list temporarily empty
785 * because another function happens to be doing non-waiting preflush
786 * before jumping into the main commit.
788 struct mutex ordered_operations_mutex;
790 struct rw_semaphore commit_root_sem;
792 struct rw_semaphore cleanup_work_sem;
794 struct rw_semaphore subvol_sem;
796 spinlock_t trans_lock;
798 * the reloc mutex goes with the trans lock, it is taken
799 * during commit to protect us from the relocation code
801 struct mutex reloc_mutex;
803 struct list_head trans_list;
804 struct list_head dead_roots;
805 struct list_head caching_block_groups;
807 spinlock_t delayed_iput_lock;
808 struct list_head delayed_iputs;
809 atomic_t nr_delayed_iputs;
810 wait_queue_head_t delayed_iputs_wait;
812 atomic64_t tree_mod_seq;
814 /* this protects tree_mod_log and tree_mod_seq_list */
815 rwlock_t tree_mod_log_lock;
816 struct rb_root tree_mod_log;
817 struct list_head tree_mod_seq_list;
819 atomic_t async_delalloc_pages;
822 * this is used to protect the following list -- ordered_roots.
824 spinlock_t ordered_root_lock;
827 * all fs/file tree roots in which there are data=ordered extents
828 * pending writeback are added into this list.
830 * these can span multiple transactions and basically include
831 * every dirty data page that isn't from nodatacow
833 struct list_head ordered_roots;
835 struct mutex delalloc_root_mutex;
836 spinlock_t delalloc_root_lock;
837 /* all fs/file tree roots that have delalloc inodes. */
838 struct list_head delalloc_roots;
841 * there is a pool of worker threads for checksumming during writes
842 * and a pool for checksumming after reads. This is because readers
843 * can run with FS locks held, and the writers may be waiting for
844 * those locks. We don't want ordering in the pending list to cause
845 * deadlocks, and so the two are serviced separately.
847 * A third pool does submit_bio to avoid deadlocking with the other
850 struct btrfs_workqueue *workers;
851 struct btrfs_workqueue *hipri_workers;
852 struct btrfs_workqueue *delalloc_workers;
853 struct btrfs_workqueue *flush_workers;
854 struct btrfs_workqueue *endio_workers;
855 struct btrfs_workqueue *endio_meta_workers;
856 struct btrfs_workqueue *endio_raid56_workers;
857 struct workqueue_struct *rmw_workers;
858 struct btrfs_workqueue *endio_meta_write_workers;
859 struct btrfs_workqueue *endio_write_workers;
860 struct btrfs_workqueue *endio_freespace_worker;
861 struct btrfs_workqueue *caching_workers;
864 * fixup workers take dirty pages that didn't properly go through
865 * the cow mechanism and make them safe to write. It happens
866 * for the sys_munmap function call path
868 struct btrfs_workqueue *fixup_workers;
869 struct btrfs_workqueue *delayed_workers;
871 struct task_struct *transaction_kthread;
872 struct task_struct *cleaner_kthread;
873 u32 thread_pool_size;
875 struct kobject *space_info_kobj;
876 struct kobject *qgroups_kobj;
878 /* used to keep from writing metadata until there is a nice batch */
879 struct percpu_counter dirty_metadata_bytes;
880 struct percpu_counter delalloc_bytes;
881 struct percpu_counter ordered_bytes;
882 s32 dirty_metadata_batch;
885 struct list_head dirty_cowonly_roots;
887 struct btrfs_fs_devices *fs_devices;
890 * The space_info list is effectively read only after initial
891 * setup. It is populated at mount time and cleaned up after
892 * all block groups are removed. RCU is used to protect it.
894 struct list_head space_info;
896 struct btrfs_space_info *data_sinfo;
898 struct reloc_control *reloc_ctl;
900 /* data_alloc_cluster is only used in ssd_spread mode */
901 struct btrfs_free_cluster data_alloc_cluster;
903 /* all metadata allocations go through this cluster */
904 struct btrfs_free_cluster meta_alloc_cluster;
906 /* auto defrag inodes go here */
907 spinlock_t defrag_inodes_lock;
908 struct rb_root defrag_inodes;
909 atomic_t defrag_running;
911 /* Used to protect avail_{data, metadata, system}_alloc_bits */
912 seqlock_t profiles_lock;
914 * these three are in extended format (availability of single
915 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
916 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
918 u64 avail_data_alloc_bits;
919 u64 avail_metadata_alloc_bits;
920 u64 avail_system_alloc_bits;
922 /* restriper state */
923 spinlock_t balance_lock;
924 struct mutex balance_mutex;
925 atomic_t balance_pause_req;
926 atomic_t balance_cancel_req;
927 struct btrfs_balance_control *balance_ctl;
928 wait_queue_head_t balance_wait_q;
930 /* Cancellation requests for chunk relocation */
931 atomic_t reloc_cancel_req;
933 u32 data_chunk_allocations;
938 /* private scrub information */
939 struct mutex scrub_lock;
940 atomic_t scrubs_running;
941 atomic_t scrub_pause_req;
942 atomic_t scrubs_paused;
943 atomic_t scrub_cancel_req;
944 wait_queue_head_t scrub_pause_wait;
946 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
949 refcount_t scrub_workers_refcnt;
950 struct workqueue_struct *scrub_workers;
951 struct workqueue_struct *scrub_wr_completion_workers;
952 struct workqueue_struct *scrub_parity_workers;
953 struct btrfs_subpage_info *subpage_info;
955 struct btrfs_discard_ctl discard_ctl;
957 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
958 u32 check_integrity_print_mask;
960 /* is qgroup tracking in a consistent state? */
963 /* holds configuration and tracking. Protected by qgroup_lock */
964 struct rb_root qgroup_tree;
965 spinlock_t qgroup_lock;
968 * used to avoid frequently calling ulist_alloc()/ulist_free()
969 * when doing qgroup accounting, it must be protected by qgroup_lock.
971 struct ulist *qgroup_ulist;
974 * Protect user change for quota operations. If a transaction is needed,
975 * it must be started before locking this lock.
977 struct mutex qgroup_ioctl_lock;
979 /* list of dirty qgroups to be written at next commit */
980 struct list_head dirty_qgroups;
982 /* used by qgroup for an efficient tree traversal */
985 /* qgroup rescan items */
986 struct mutex qgroup_rescan_lock; /* protects the progress item */
987 struct btrfs_key qgroup_rescan_progress;
988 struct btrfs_workqueue *qgroup_rescan_workers;
989 struct completion qgroup_rescan_completion;
990 struct btrfs_work qgroup_rescan_work;
991 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */
993 /* filesystem state */
994 unsigned long fs_state;
996 struct btrfs_delayed_root *delayed_root;
998 /* Extent buffer xarray */
999 spinlock_t buffer_lock;
1000 /* Entries are eb->start / sectorsize */
1001 struct xarray extent_buffers;
1003 /* next backup root to be overwritten */
1004 int backup_root_index;
1006 /* device replace state */
1007 struct btrfs_dev_replace dev_replace;
1009 struct semaphore uuid_tree_rescan_sem;
1011 /* Used to reclaim the metadata space in the background. */
1012 struct work_struct async_reclaim_work;
1013 struct work_struct async_data_reclaim_work;
1014 struct work_struct preempt_reclaim_work;
1016 /* Reclaim partially filled block groups in the background */
1017 struct work_struct reclaim_bgs_work;
1018 struct list_head reclaim_bgs;
1019 int bg_reclaim_threshold;
1021 spinlock_t unused_bgs_lock;
1022 struct list_head unused_bgs;
1023 struct mutex unused_bg_unpin_mutex;
1024 /* Protect block groups that are going to be deleted */
1025 struct mutex reclaim_bgs_lock;
1027 /* Cached block sizes */
1030 /* ilog2 of sectorsize, use to avoid 64bit division */
1031 u32 sectorsize_bits;
1036 /* Block groups and devices containing active swapfiles. */
1037 spinlock_t swapfile_pins_lock;
1038 struct rb_root swapfile_pins;
1040 struct crypto_shash *csum_shash;
1042 /* Type of exclusive operation running, protected by super_lock */
1043 enum btrfs_exclusive_operation exclusive_operation;
1046 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1047 * if the mode is enabled
1051 struct mutex zoned_meta_io_lock;
1052 spinlock_t treelog_bg_lock;
1056 * Start of the dedicated data relocation block group, protected by
1057 * relocation_bg_lock.
1059 spinlock_t relocation_bg_lock;
1061 struct mutex zoned_data_reloc_io_lock;
1063 u64 nr_global_roots;
1065 spinlock_t zone_active_bgs_lock;
1066 struct list_head zone_active_bgs;
1068 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1069 spinlock_t ref_verify_lock;
1070 struct rb_root block_tree;
1073 #ifdef CONFIG_BTRFS_DEBUG
1074 struct kobject *debug_kobj;
1075 struct kobject *discard_debug_kobj;
1076 struct list_head allocated_roots;
1078 spinlock_t eb_leak_lock;
1079 struct list_head allocated_ebs;
1083 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1085 return sb->s_fs_info;
1089 * The state of btrfs root
1093 * btrfs_record_root_in_trans is a multi-step process, and it can race
1094 * with the balancing code. But the race is very small, and only the
1095 * first time the root is added to each transaction. So IN_TRANS_SETUP
1096 * is used to tell us when more checks are required
1098 BTRFS_ROOT_IN_TRANS_SETUP,
1101 * Set if tree blocks of this root can be shared by other roots.
1102 * Only subvolume trees and their reloc trees have this bit set.
1103 * Conflicts with TRACK_DIRTY bit.
1105 * This affects two things:
1107 * - How balance works
1108 * For shareable roots, we need to use reloc tree and do path
1109 * replacement for balance, and need various pre/post hooks for
1110 * snapshot creation to handle them.
1112 * While for non-shareable trees, we just simply do a tree search
1115 * - How dirty roots are tracked
1116 * For shareable roots, btrfs_record_root_in_trans() is needed to
1117 * track them, while non-subvolume roots have TRACK_DIRTY bit, they
1118 * don't need to set this manually.
1120 BTRFS_ROOT_SHAREABLE,
1121 BTRFS_ROOT_TRACK_DIRTY,
1122 /* The root is tracked in fs_info::fs_roots */
1123 BTRFS_ROOT_REGISTERED,
1124 BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1125 BTRFS_ROOT_DEFRAG_RUNNING,
1126 BTRFS_ROOT_FORCE_COW,
1127 BTRFS_ROOT_MULTI_LOG_TASKS,
1129 BTRFS_ROOT_DELETING,
1132 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1134 * Set for the subvolume tree owning the reloc tree.
1136 BTRFS_ROOT_DEAD_RELOC_TREE,
1137 /* Mark dead root stored on device whose cleanup needs to be resumed */
1138 BTRFS_ROOT_DEAD_TREE,
1139 /* The root has a log tree. Used for subvolume roots and the tree root. */
1140 BTRFS_ROOT_HAS_LOG_TREE,
1141 /* Qgroup flushing is in progress */
1142 BTRFS_ROOT_QGROUP_FLUSHING,
1143 /* We started the orphan cleanup for this root. */
1144 BTRFS_ROOT_ORPHAN_CLEANUP,
1145 /* This root has a drop operation that was started previously. */
1146 BTRFS_ROOT_UNFINISHED_DROP,
1149 static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
1151 clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags);
1155 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1156 * code. For detail check comment in fs/btrfs/qgroup.c.
1158 struct btrfs_qgroup_swapped_blocks {
1160 /* RM_EMPTY_ROOT() of above blocks[] */
1162 struct rb_root blocks[BTRFS_MAX_LEVEL];
1166 * in ram representation of the tree. extent_root is used for all allocations
1167 * and for the extent tree extent_root root.
1170 struct rb_node rb_node;
1172 struct extent_buffer *node;
1174 struct extent_buffer *commit_root;
1175 struct btrfs_root *log_root;
1176 struct btrfs_root *reloc_root;
1178 unsigned long state;
1179 struct btrfs_root_item root_item;
1180 struct btrfs_key root_key;
1181 struct btrfs_fs_info *fs_info;
1182 struct extent_io_tree dirty_log_pages;
1184 struct mutex objectid_mutex;
1186 spinlock_t accounting_lock;
1187 struct btrfs_block_rsv *block_rsv;
1189 struct mutex log_mutex;
1190 wait_queue_head_t log_writer_wait;
1191 wait_queue_head_t log_commit_wait[2];
1192 struct list_head log_ctxs[2];
1193 /* Used only for log trees of subvolumes, not for the log root tree */
1194 atomic_t log_writers;
1195 atomic_t log_commit[2];
1196 /* Used only for log trees of subvolumes, not for the log root tree */
1199 /* No matter the commit succeeds or not*/
1200 int log_transid_committed;
1201 /* Just be updated when the commit succeeds. */
1202 int last_log_commit;
1203 pid_t log_start_pid;
1211 struct btrfs_key defrag_progress;
1212 struct btrfs_key defrag_max;
1214 /* The dirty list is only used by non-shareable roots */
1215 struct list_head dirty_list;
1217 struct list_head root_list;
1219 spinlock_t log_extents_lock[2];
1220 struct list_head logged_list[2];
1222 spinlock_t inode_lock;
1223 /* red-black tree that keeps track of in-memory inodes */
1224 struct rb_root inode_tree;
1227 * Xarray that keeps track of delayed nodes of every inode, protected
1230 struct xarray delayed_nodes;
1232 * right now this just gets used so that a root has its own devid
1233 * for stat. It may be used for more later
1237 spinlock_t root_item_lock;
1240 struct mutex delalloc_mutex;
1241 spinlock_t delalloc_lock;
1243 * all of the inodes that have delalloc bytes. It is possible for
1244 * this list to be empty even when there is still dirty data=ordered
1245 * extents waiting to finish IO.
1247 struct list_head delalloc_inodes;
1248 struct list_head delalloc_root;
1249 u64 nr_delalloc_inodes;
1251 struct mutex ordered_extent_mutex;
1253 * this is used by the balancing code to wait for all the pending
1256 spinlock_t ordered_extent_lock;
1259 * all of the data=ordered extents pending writeback
1260 * these can span multiple transactions and basically include
1261 * every dirty data page that isn't from nodatacow
1263 struct list_head ordered_extents;
1264 struct list_head ordered_root;
1265 u64 nr_ordered_extents;
1268 * Not empty if this subvolume root has gone through tree block swap
1271 * Will be used by reloc_control::dirty_subvol_roots.
1273 struct list_head reloc_dirty_list;
1276 * Number of currently running SEND ioctls to prevent
1277 * manipulation with the read-only status via SUBVOL_SETFLAGS
1279 int send_in_progress;
1281 * Number of currently running deduplication operations that have a
1282 * destination inode belonging to this root. Protected by the lock
1285 int dedupe_in_progress;
1286 /* For exclusion of snapshot creation and nocow writes */
1287 struct btrfs_drew_lock snapshot_lock;
1289 atomic_t snapshot_force_cow;
1291 /* For qgroup metadata reserved space */
1292 spinlock_t qgroup_meta_rsv_lock;
1293 u64 qgroup_meta_rsv_pertrans;
1294 u64 qgroup_meta_rsv_prealloc;
1295 wait_queue_head_t qgroup_flush_wait;
1297 /* Number of active swapfiles */
1298 atomic_t nr_swapfiles;
1300 /* Record pairs of swapped blocks for qgroup */
1301 struct btrfs_qgroup_swapped_blocks swapped_blocks;
1303 /* Used only by log trees, when logging csum items */
1304 struct extent_io_tree log_csum_range;
1306 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1310 #ifdef CONFIG_BTRFS_DEBUG
1311 struct list_head leak_list;
1316 * Structure that conveys information about an extent that is going to replace
1317 * all the extents in a file range.
1319 struct btrfs_replace_extent_info {
1325 /* Pointer to a file extent item of type regular or prealloc. */
1328 * Set to true when attempting to replace a file range with a new extent
1329 * described by this structure, set to false when attempting to clone an
1330 * existing extent into a file range.
1333 /* Indicate if we should update the inode's mtime and ctime. */
1335 /* Meaningful only if is_new_extent is true. */
1336 int qgroup_reserved;
1338 * Meaningful only if is_new_extent is true.
1339 * Used to track how many extent items we have already inserted in a
1340 * subvolume tree that refer to the extent described by this structure,
1341 * so that we know when to create a new delayed ref or update an existing
1347 /* Arguments for btrfs_drop_extents() */
1348 struct btrfs_drop_extents_args {
1349 /* Input parameters */
1352 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1353 * If 'replace_extent' is true, this must not be NULL. Also the path
1354 * is always released except if 'replace_extent' is true and
1355 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1356 * the path is kept locked.
1358 struct btrfs_path *path;
1359 /* Start offset of the range to drop extents from */
1361 /* End (exclusive, last byte + 1) of the range to drop extents from */
1363 /* If true drop all the extent maps in the range */
1366 * If true it means we want to insert a new extent after dropping all
1367 * the extents in the range. If this is true, the 'extent_item_size'
1368 * parameter must be set as well and the 'extent_inserted' field will
1369 * be set to true by btrfs_drop_extents() if it could insert the new
1371 * Note: when this is set to true the path must not be NULL.
1373 bool replace_extent;
1375 * Used if 'replace_extent' is true. Size of the file extent item to
1376 * insert after dropping all existing extents in the range
1378 u32 extent_item_size;
1380 /* Output parameters */
1383 * Set to the minimum between the input parameter 'end' and the end
1384 * (exclusive, last byte + 1) of the last dropped extent. This is always
1385 * set even if btrfs_drop_extents() returns an error.
1389 * The number of allocated bytes found in the range. This can be smaller
1390 * than the range's length when there are holes in the range.
1394 * Only set if 'replace_extent' is true. Set to true if we were able
1395 * to insert a replacement extent after dropping all extents in the
1396 * range, otherwise set to false by btrfs_drop_extents().
1397 * Also, if btrfs_drop_extents() has set this to true it means it
1398 * returned with the path locked, otherwise if it has set this to
1399 * false it has returned with the path released.
1401 bool extent_inserted;
1404 struct btrfs_file_private {
1409 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1412 return info->nodesize - sizeof(struct btrfs_header);
1415 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items)
1417 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1419 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1422 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1424 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1427 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1428 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1429 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1431 return BTRFS_MAX_ITEM_SIZE(info) -
1432 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1435 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1437 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1441 * Flags for mount options.
1443 * Note: don't forget to add new options to btrfs_show_options()
1446 BTRFS_MOUNT_NODATASUM = (1UL << 0),
1447 BTRFS_MOUNT_NODATACOW = (1UL << 1),
1448 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
1449 BTRFS_MOUNT_SSD = (1UL << 3),
1450 BTRFS_MOUNT_DEGRADED = (1UL << 4),
1451 BTRFS_MOUNT_COMPRESS = (1UL << 5),
1452 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
1453 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
1454 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
1455 BTRFS_MOUNT_NOSSD = (1UL << 9),
1456 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
1457 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
1458 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
1459 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
1460 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
1461 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
1462 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
1463 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
1464 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
1465 BTRFS_MOUNT_CHECK_INTEGRITY = (1UL << 19),
1466 BTRFS_MOUNT_CHECK_INTEGRITY_DATA = (1UL << 20),
1467 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 21),
1468 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 22),
1469 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 23),
1470 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 24),
1471 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 25),
1472 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 26),
1473 BTRFS_MOUNT_REF_VERIFY = (1UL << 27),
1474 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 28),
1475 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 29),
1476 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 30),
1479 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1480 #define BTRFS_DEFAULT_MAX_INLINE (2048)
1482 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1483 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1484 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1485 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1488 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1490 if (!btrfs_test_opt(fs_info, opt)) \
1491 btrfs_info(fs_info, fmt, ##args); \
1492 btrfs_set_opt(fs_info->mount_opt, opt); \
1495 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1497 if (btrfs_test_opt(fs_info, opt)) \
1498 btrfs_info(fs_info, fmt, ##args); \
1499 btrfs_clear_opt(fs_info->mount_opt, opt); \
1503 * Requests for changes that need to be done during transaction commit.
1505 * Internal mount options that are used for special handling of the real
1506 * mount options (eg. cannot be set during remount and have to be set during
1507 * transaction commit)
1510 #define BTRFS_PENDING_COMMIT (0)
1512 #define btrfs_test_pending(info, opt) \
1513 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1514 #define btrfs_set_pending(info, opt) \
1515 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1516 #define btrfs_clear_pending(info, opt) \
1517 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1520 * Helpers for setting pending mount option changes.
1522 * Expects corresponding macros
1523 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1525 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1527 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1528 btrfs_info((info), fmt, ##args); \
1529 btrfs_set_pending((info), SET_##opt); \
1530 btrfs_clear_pending((info), CLEAR_##opt); \
1534 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1536 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1537 btrfs_info((info), fmt, ##args); \
1538 btrfs_set_pending((info), CLEAR_##opt); \
1539 btrfs_clear_pending((info), SET_##opt); \
1546 #define BTRFS_INODE_NODATASUM (1U << 0)
1547 #define BTRFS_INODE_NODATACOW (1U << 1)
1548 #define BTRFS_INODE_READONLY (1U << 2)
1549 #define BTRFS_INODE_NOCOMPRESS (1U << 3)
1550 #define BTRFS_INODE_PREALLOC (1U << 4)
1551 #define BTRFS_INODE_SYNC (1U << 5)
1552 #define BTRFS_INODE_IMMUTABLE (1U << 6)
1553 #define BTRFS_INODE_APPEND (1U << 7)
1554 #define BTRFS_INODE_NODUMP (1U << 8)
1555 #define BTRFS_INODE_NOATIME (1U << 9)
1556 #define BTRFS_INODE_DIRSYNC (1U << 10)
1557 #define BTRFS_INODE_COMPRESS (1U << 11)
1559 #define BTRFS_INODE_ROOT_ITEM_INIT (1U << 31)
1561 #define BTRFS_INODE_FLAG_MASK \
1562 (BTRFS_INODE_NODATASUM | \
1563 BTRFS_INODE_NODATACOW | \
1564 BTRFS_INODE_READONLY | \
1565 BTRFS_INODE_NOCOMPRESS | \
1566 BTRFS_INODE_PREALLOC | \
1567 BTRFS_INODE_SYNC | \
1568 BTRFS_INODE_IMMUTABLE | \
1569 BTRFS_INODE_APPEND | \
1570 BTRFS_INODE_NODUMP | \
1571 BTRFS_INODE_NOATIME | \
1572 BTRFS_INODE_DIRSYNC | \
1573 BTRFS_INODE_COMPRESS | \
1574 BTRFS_INODE_ROOT_ITEM_INIT)
1576 #define BTRFS_INODE_RO_VERITY (1U << 0)
1578 #define BTRFS_INODE_RO_FLAG_MASK (BTRFS_INODE_RO_VERITY)
1580 struct btrfs_map_token {
1581 struct extent_buffer *eb;
1583 unsigned long offset;
1586 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1587 ((bytes) >> (fs_info)->sectorsize_bits)
1589 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1590 struct extent_buffer *eb)
1593 token->kaddr = page_address(eb->pages[0]);
1597 /* some macros to generate set/get functions for the struct fields. This
1598 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1601 #define le8_to_cpu(v) (v)
1602 #define cpu_to_le8(v) (v)
1605 static inline u8 get_unaligned_le8(const void *p)
1610 static inline void put_unaligned_le8(u8 val, void *p)
1615 #define read_eb_member(eb, ptr, type, member, result) (\
1616 read_extent_buffer(eb, (char *)(result), \
1617 ((unsigned long)(ptr)) + \
1618 offsetof(type, member), \
1619 sizeof(((type *)0)->member)))
1621 #define write_eb_member(eb, ptr, type, member, result) (\
1622 write_extent_buffer(eb, (char *)(result), \
1623 ((unsigned long)(ptr)) + \
1624 offsetof(type, member), \
1625 sizeof(((type *)0)->member)))
1627 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1628 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
1629 const void *ptr, unsigned long off); \
1630 void btrfs_set_token_##bits(struct btrfs_map_token *token, \
1631 const void *ptr, unsigned long off, \
1633 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
1634 const void *ptr, unsigned long off); \
1635 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
1636 unsigned long off, u##bits val);
1638 DECLARE_BTRFS_SETGET_BITS(8)
1639 DECLARE_BTRFS_SETGET_BITS(16)
1640 DECLARE_BTRFS_SETGET_BITS(32)
1641 DECLARE_BTRFS_SETGET_BITS(64)
1643 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1644 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1647 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1648 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1650 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1653 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1654 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1656 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
1659 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1660 return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1662 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1663 type *s, u##bits val) \
1665 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1666 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
1669 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1670 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1672 const type *p = page_address(eb->pages[0]) + \
1673 offset_in_page(eb->start); \
1674 return get_unaligned_le##bits(&p->member); \
1676 static inline void btrfs_set_##name(const struct extent_buffer *eb, \
1679 type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1680 put_unaligned_le##bits(val, &p->member); \
1683 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1684 static inline u##bits btrfs_##name(const type *s) \
1686 return get_unaligned_le##bits(&s->member); \
1688 static inline void btrfs_set_##name(type *s, u##bits val) \
1690 put_unaligned_le##bits(val, &s->member); \
1693 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1694 struct btrfs_dev_item *s)
1696 static_assert(sizeof(u64) ==
1697 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1698 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1701 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1702 struct btrfs_dev_item *s,
1705 static_assert(sizeof(u64) ==
1706 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1707 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1708 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1712 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1713 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1714 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1715 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1716 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1718 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1719 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1720 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1721 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1722 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1723 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1725 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1726 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1728 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1730 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1732 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1734 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1736 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1737 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1739 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1741 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1743 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1746 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1748 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1751 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1753 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1756 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1757 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1758 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1759 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1760 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1761 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1762 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1763 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1764 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1765 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1766 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1768 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1770 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1773 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1774 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1775 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1777 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1779 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1781 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1783 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1784 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1786 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1788 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1789 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1791 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1794 unsigned long offset = (unsigned long)c;
1795 offset += offsetof(struct btrfs_chunk, stripe);
1796 offset += nr * sizeof(struct btrfs_stripe);
1797 return (struct btrfs_stripe *)offset;
1800 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1802 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1805 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1806 struct btrfs_chunk *c, int nr)
1808 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1811 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1812 struct btrfs_chunk *c, int nr)
1814 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1817 /* struct btrfs_block_group_item */
1818 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1820 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1822 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1823 struct btrfs_block_group_item, chunk_objectid, 64);
1825 BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1826 struct btrfs_block_group_item, chunk_objectid, 64);
1827 BTRFS_SETGET_FUNCS(block_group_flags,
1828 struct btrfs_block_group_item, flags, 64);
1829 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1830 struct btrfs_block_group_item, flags, 64);
1832 /* struct btrfs_free_space_info */
1833 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1835 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1837 /* struct btrfs_inode_ref */
1838 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1839 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1841 /* struct btrfs_inode_extref */
1842 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1843 parent_objectid, 64);
1844 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1846 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1848 /* struct btrfs_inode_item */
1849 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1850 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1851 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1852 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1853 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1854 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1855 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1856 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1857 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1858 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1859 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1860 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1861 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1863 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1865 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1867 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1868 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1870 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1872 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1873 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1874 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1875 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1876 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1877 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1878 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1879 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1880 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1881 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1883 /* struct btrfs_dev_extent */
1884 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1886 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1887 chunk_objectid, 64);
1888 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1890 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1891 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1892 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1894 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1896 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1898 static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1899 struct btrfs_tree_block_info *item,
1900 struct btrfs_disk_key *key)
1902 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1905 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1906 struct btrfs_tree_block_info *item,
1907 struct btrfs_disk_key *key)
1909 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1912 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1914 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1916 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1918 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1921 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1924 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1926 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1929 static inline u32 btrfs_extent_inline_ref_size(int type)
1931 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1932 type == BTRFS_SHARED_BLOCK_REF_KEY)
1933 return sizeof(struct btrfs_extent_inline_ref);
1934 if (type == BTRFS_SHARED_DATA_REF_KEY)
1935 return sizeof(struct btrfs_shared_data_ref) +
1936 sizeof(struct btrfs_extent_inline_ref);
1937 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1938 return sizeof(struct btrfs_extent_data_ref) +
1939 offsetof(struct btrfs_extent_inline_ref, offset);
1943 /* struct btrfs_node */
1944 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1945 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1946 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1948 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1951 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1954 ptr = offsetof(struct btrfs_node, ptrs) +
1955 sizeof(struct btrfs_key_ptr) * nr;
1956 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1959 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1963 ptr = offsetof(struct btrfs_node, ptrs) +
1964 sizeof(struct btrfs_key_ptr) * nr;
1965 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1968 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1971 ptr = offsetof(struct btrfs_node, ptrs) +
1972 sizeof(struct btrfs_key_ptr) * nr;
1973 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1976 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1980 ptr = offsetof(struct btrfs_node, ptrs) +
1981 sizeof(struct btrfs_key_ptr) * nr;
1982 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1985 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1987 return offsetof(struct btrfs_node, ptrs) +
1988 sizeof(struct btrfs_key_ptr) * nr;
1991 void btrfs_node_key(const struct extent_buffer *eb,
1992 struct btrfs_disk_key *disk_key, int nr);
1994 static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1995 struct btrfs_disk_key *disk_key, int nr)
1998 ptr = btrfs_node_key_ptr_offset(nr);
1999 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
2000 struct btrfs_key_ptr, key, disk_key);
2003 /* struct btrfs_item */
2004 BTRFS_SETGET_FUNCS(raw_item_offset, struct btrfs_item, offset, 32);
2005 BTRFS_SETGET_FUNCS(raw_item_size, struct btrfs_item, size, 32);
2006 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
2007 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
2009 static inline unsigned long btrfs_item_nr_offset(int nr)
2011 return offsetof(struct btrfs_leaf, items) +
2012 sizeof(struct btrfs_item) * nr;
2015 static inline struct btrfs_item *btrfs_item_nr(int nr)
2017 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2020 #define BTRFS_ITEM_SETGET_FUNCS(member) \
2021 static inline u32 btrfs_item_##member(const struct extent_buffer *eb, \
2024 return btrfs_raw_item_##member(eb, btrfs_item_nr(slot)); \
2026 static inline void btrfs_set_item_##member(const struct extent_buffer *eb, \
2027 int slot, u32 val) \
2029 btrfs_set_raw_item_##member(eb, btrfs_item_nr(slot), val); \
2031 static inline u32 btrfs_token_item_##member(struct btrfs_map_token *token, \
2034 struct btrfs_item *item = btrfs_item_nr(slot); \
2035 return btrfs_token_raw_item_##member(token, item); \
2037 static inline void btrfs_set_token_item_##member(struct btrfs_map_token *token, \
2038 int slot, u32 val) \
2040 struct btrfs_item *item = btrfs_item_nr(slot); \
2041 btrfs_set_token_raw_item_##member(token, item, val); \
2044 BTRFS_ITEM_SETGET_FUNCS(offset)
2045 BTRFS_ITEM_SETGET_FUNCS(size);
2047 static inline u32 btrfs_item_data_end(const struct extent_buffer *eb, int nr)
2049 return btrfs_item_offset(eb, nr) + btrfs_item_size(eb, nr);
2052 static inline void btrfs_item_key(const struct extent_buffer *eb,
2053 struct btrfs_disk_key *disk_key, int nr)
2055 struct btrfs_item *item = btrfs_item_nr(nr);
2056 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2059 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2060 struct btrfs_disk_key *disk_key, int nr)
2062 struct btrfs_item *item = btrfs_item_nr(nr);
2063 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2066 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2069 * struct btrfs_root_ref
2071 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2072 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2073 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2075 /* struct btrfs_dir_item */
2076 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2077 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2078 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2079 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2080 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2081 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2083 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2085 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2088 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2089 const struct btrfs_dir_item *item,
2090 struct btrfs_disk_key *key)
2092 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2095 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2096 struct btrfs_dir_item *item,
2097 const struct btrfs_disk_key *key)
2099 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2102 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2104 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2106 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2109 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2110 const struct btrfs_free_space_header *h,
2111 struct btrfs_disk_key *key)
2113 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2116 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2117 struct btrfs_free_space_header *h,
2118 const struct btrfs_disk_key *key)
2120 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2123 /* struct btrfs_disk_key */
2124 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2126 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2127 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2129 #ifdef __LITTLE_ENDIAN
2132 * Optimized helpers for little-endian architectures where CPU and on-disk
2133 * structures have the same endianness and we can skip conversions.
2136 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2137 const struct btrfs_disk_key *disk_key)
2139 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2142 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2143 const struct btrfs_key *cpu_key)
2145 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2148 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2149 struct btrfs_key *cpu_key, int nr)
2151 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2153 btrfs_node_key(eb, disk_key, nr);
2156 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2157 struct btrfs_key *cpu_key, int nr)
2159 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2161 btrfs_item_key(eb, disk_key, nr);
2164 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2165 const struct btrfs_dir_item *item,
2166 struct btrfs_key *cpu_key)
2168 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2170 btrfs_dir_item_key(eb, item, disk_key);
2175 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2176 const struct btrfs_disk_key *disk)
2178 cpu->offset = le64_to_cpu(disk->offset);
2179 cpu->type = disk->type;
2180 cpu->objectid = le64_to_cpu(disk->objectid);
2183 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2184 const struct btrfs_key *cpu)
2186 disk->offset = cpu_to_le64(cpu->offset);
2187 disk->type = cpu->type;
2188 disk->objectid = cpu_to_le64(cpu->objectid);
2191 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2192 struct btrfs_key *key, int nr)
2194 struct btrfs_disk_key disk_key;
2195 btrfs_node_key(eb, &disk_key, nr);
2196 btrfs_disk_key_to_cpu(key, &disk_key);
2199 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2200 struct btrfs_key *key, int nr)
2202 struct btrfs_disk_key disk_key;
2203 btrfs_item_key(eb, &disk_key, nr);
2204 btrfs_disk_key_to_cpu(key, &disk_key);
2207 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2208 const struct btrfs_dir_item *item,
2209 struct btrfs_key *key)
2211 struct btrfs_disk_key disk_key;
2212 btrfs_dir_item_key(eb, item, &disk_key);
2213 btrfs_disk_key_to_cpu(key, &disk_key);
2218 /* struct btrfs_header */
2219 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2220 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2222 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2223 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2224 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2225 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2226 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2228 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2229 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2231 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2233 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2235 return (btrfs_header_flags(eb) & flag) == flag;
2238 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2240 u64 flags = btrfs_header_flags(eb);
2241 btrfs_set_header_flags(eb, flags | flag);
2244 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2246 u64 flags = btrfs_header_flags(eb);
2247 btrfs_set_header_flags(eb, flags & ~flag);
2250 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2252 u64 flags = btrfs_header_flags(eb);
2253 return flags >> BTRFS_BACKREF_REV_SHIFT;
2256 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2259 u64 flags = btrfs_header_flags(eb);
2260 flags &= ~BTRFS_BACKREF_REV_MASK;
2261 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2262 btrfs_set_header_flags(eb, flags);
2265 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2267 return btrfs_header_level(eb) == 0;
2270 /* struct btrfs_root_item */
2271 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2273 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2274 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2275 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2277 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2279 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2280 BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2281 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2282 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2283 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2284 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2285 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2286 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2287 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2289 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2291 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2293 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2295 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2297 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2300 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2302 /* Byte-swap the constant at compile time, root_item::flags is LE */
2303 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2306 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2308 /* Byte-swap the constant at compile time, root_item::flags is LE */
2309 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2312 static inline u64 btrfs_root_id(const struct btrfs_root *root)
2314 return root->root_key.objectid;
2317 /* struct btrfs_root_backup */
2318 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2320 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2322 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2323 tree_root_level, 8);
2325 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2327 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2328 chunk_root_gen, 64);
2329 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2330 chunk_root_level, 8);
2332 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2334 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2335 extent_root_gen, 64);
2336 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2337 extent_root_level, 8);
2339 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2341 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2343 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2346 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2348 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2350 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2353 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2355 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2357 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2358 csum_root_level, 8);
2359 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2361 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2363 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2367 * For extent tree v2 we overload the extent root with the block group root, as
2368 * we will have multiple extent roots.
2370 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root, struct btrfs_root_backup,
2372 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_gen, struct btrfs_root_backup,
2373 extent_root_gen, 64);
2374 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_level,
2375 struct btrfs_root_backup, extent_root_level, 8);
2377 /* struct btrfs_balance_item */
2378 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2380 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2381 const struct btrfs_balance_item *bi,
2382 struct btrfs_disk_balance_args *ba)
2384 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2387 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2388 struct btrfs_balance_item *bi,
2389 const struct btrfs_disk_balance_args *ba)
2391 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2394 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2395 const struct btrfs_balance_item *bi,
2396 struct btrfs_disk_balance_args *ba)
2398 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2401 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2402 struct btrfs_balance_item *bi,
2403 const struct btrfs_disk_balance_args *ba)
2405 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2408 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2409 const struct btrfs_balance_item *bi,
2410 struct btrfs_disk_balance_args *ba)
2412 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2415 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2416 struct btrfs_balance_item *bi,
2417 const struct btrfs_disk_balance_args *ba)
2419 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2423 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2424 const struct btrfs_disk_balance_args *disk)
2426 memset(cpu, 0, sizeof(*cpu));
2428 cpu->profiles = le64_to_cpu(disk->profiles);
2429 cpu->usage = le64_to_cpu(disk->usage);
2430 cpu->devid = le64_to_cpu(disk->devid);
2431 cpu->pstart = le64_to_cpu(disk->pstart);
2432 cpu->pend = le64_to_cpu(disk->pend);
2433 cpu->vstart = le64_to_cpu(disk->vstart);
2434 cpu->vend = le64_to_cpu(disk->vend);
2435 cpu->target = le64_to_cpu(disk->target);
2436 cpu->flags = le64_to_cpu(disk->flags);
2437 cpu->limit = le64_to_cpu(disk->limit);
2438 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2439 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2443 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2444 const struct btrfs_balance_args *cpu)
2446 memset(disk, 0, sizeof(*disk));
2448 disk->profiles = cpu_to_le64(cpu->profiles);
2449 disk->usage = cpu_to_le64(cpu->usage);
2450 disk->devid = cpu_to_le64(cpu->devid);
2451 disk->pstart = cpu_to_le64(cpu->pstart);
2452 disk->pend = cpu_to_le64(cpu->pend);
2453 disk->vstart = cpu_to_le64(cpu->vstart);
2454 disk->vend = cpu_to_le64(cpu->vend);
2455 disk->target = cpu_to_le64(cpu->target);
2456 disk->flags = cpu_to_le64(cpu->flags);
2457 disk->limit = cpu_to_le64(cpu->limit);
2458 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2459 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2462 /* struct btrfs_super_block */
2463 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2464 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2465 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2467 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2468 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2469 struct btrfs_super_block, sys_chunk_array_size, 32);
2470 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2471 struct btrfs_super_block, chunk_root_generation, 64);
2472 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2474 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2476 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2477 chunk_root_level, 8);
2478 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2480 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2481 log_root_transid, 64);
2482 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2484 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2486 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2488 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2490 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2492 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2494 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2495 root_dir_objectid, 64);
2496 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2498 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2500 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2501 compat_ro_flags, 64);
2502 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2503 incompat_flags, 64);
2504 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2506 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2507 cache_generation, 64);
2508 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2509 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2510 uuid_tree_generation, 64);
2511 BTRFS_SETGET_STACK_FUNCS(super_block_group_root, struct btrfs_super_block,
2512 block_group_root, 64);
2513 BTRFS_SETGET_STACK_FUNCS(super_block_group_root_generation,
2514 struct btrfs_super_block,
2515 block_group_root_generation, 64);
2516 BTRFS_SETGET_STACK_FUNCS(super_block_group_root_level, struct btrfs_super_block,
2517 block_group_root_level, 8);
2519 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2520 const char *btrfs_super_csum_name(u16 csum_type);
2521 const char *btrfs_super_csum_driver(u16 csum_type);
2522 size_t __attribute_const__ btrfs_get_num_csums(void);
2526 * The leaf data grows from end-to-front in the node.
2527 * this returns the address of the start of the last item,
2528 * which is the stop of the leaf data stack
2530 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2532 u32 nr = btrfs_header_nritems(leaf);
2535 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2536 return btrfs_item_offset(leaf, nr - 1);
2539 /* struct btrfs_file_extent_item */
2540 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2542 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2543 struct btrfs_file_extent_item, disk_bytenr, 64);
2544 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2545 struct btrfs_file_extent_item, offset, 64);
2546 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2547 struct btrfs_file_extent_item, generation, 64);
2548 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2549 struct btrfs_file_extent_item, num_bytes, 64);
2550 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2551 struct btrfs_file_extent_item, ram_bytes, 64);
2552 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2553 struct btrfs_file_extent_item, disk_num_bytes, 64);
2554 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2555 struct btrfs_file_extent_item, compression, 8);
2557 static inline unsigned long
2558 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2560 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2563 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2565 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2568 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2569 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2571 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2573 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2574 disk_num_bytes, 64);
2575 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2577 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2579 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2581 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2583 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2585 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2586 other_encoding, 16);
2589 * this returns the number of bytes used by the item on disk, minus the
2590 * size of any extent headers. If a file is compressed on disk, this is
2591 * the compressed size
2593 static inline u32 btrfs_file_extent_inline_item_len(
2594 const struct extent_buffer *eb,
2597 return btrfs_item_size(eb, nr) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2600 /* btrfs_qgroup_status_item */
2601 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2603 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2605 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2607 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2610 /* btrfs_qgroup_info_item */
2611 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2613 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2614 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2616 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2617 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2620 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2621 struct btrfs_qgroup_info_item, generation, 64);
2622 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2624 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2625 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2626 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2628 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2629 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2631 /* btrfs_qgroup_limit_item */
2632 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2634 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2636 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2638 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2640 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2643 /* btrfs_dev_replace_item */
2644 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2645 struct btrfs_dev_replace_item, src_devid, 64);
2646 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2647 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2649 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2651 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2653 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2655 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2656 num_write_errors, 64);
2657 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2658 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2660 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2662 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2665 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2666 struct btrfs_dev_replace_item, src_devid, 64);
2667 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2668 struct btrfs_dev_replace_item,
2669 cont_reading_from_srcdev_mode, 64);
2670 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2671 struct btrfs_dev_replace_item, replace_state, 64);
2672 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2673 struct btrfs_dev_replace_item, time_started, 64);
2674 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2675 struct btrfs_dev_replace_item, time_stopped, 64);
2676 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2677 struct btrfs_dev_replace_item, num_write_errors, 64);
2678 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2679 struct btrfs_dev_replace_item,
2680 num_uncorrectable_read_errors, 64);
2681 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2682 struct btrfs_dev_replace_item, cursor_left, 64);
2683 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2684 struct btrfs_dev_replace_item, cursor_right, 64);
2686 /* helper function to cast into the data area of the leaf. */
2687 #define btrfs_item_ptr(leaf, slot, type) \
2688 ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2689 btrfs_item_offset(leaf, slot)))
2691 #define btrfs_item_ptr_offset(leaf, slot) \
2692 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2693 btrfs_item_offset(leaf, slot)))
2695 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2697 return crc32c(crc, address, length);
2700 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2702 put_unaligned_le32(~crc, result);
2705 static inline u64 btrfs_name_hash(const char *name, int len)
2707 return crc32c((u32)~1, name, len);
2711 * Figure the key offset of an extended inode ref
2713 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2716 return (u64) crc32c(parent_objectid, name, len);
2719 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2721 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2726 enum btrfs_inline_ref_type {
2727 BTRFS_REF_TYPE_INVALID,
2728 BTRFS_REF_TYPE_BLOCK,
2729 BTRFS_REF_TYPE_DATA,
2733 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2734 struct btrfs_extent_inline_ref *iref,
2735 enum btrfs_inline_ref_type is_data);
2736 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2739 * Take the number of bytes to be checksummmed and figure out how many leaves
2740 * it would require to store the csums for that many bytes.
2742 static inline u64 btrfs_csum_bytes_to_leaves(
2743 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2745 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2747 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2751 * Use this if we would be adding new items, as we could split nodes as we cow
2754 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2757 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2761 * Doing a truncate or a modification won't result in new nodes or leaves, just
2762 * what we need for COW.
2764 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2767 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2770 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2771 u64 start, u64 num_bytes);
2772 void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2773 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2774 unsigned long count);
2775 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2776 struct btrfs_delayed_ref_root *delayed_refs,
2777 struct btrfs_delayed_ref_head *head);
2778 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2779 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2780 struct btrfs_fs_info *fs_info, u64 bytenr,
2781 u64 offset, int metadata, u64 *refs, u64 *flags);
2782 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2784 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2785 u64 bytenr, u64 num_bytes);
2786 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2787 int btrfs_cross_ref_exist(struct btrfs_root *root,
2788 u64 objectid, u64 offset, u64 bytenr, bool strict,
2789 struct btrfs_path *path);
2790 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2791 struct btrfs_root *root,
2792 u64 parent, u64 root_objectid,
2793 const struct btrfs_disk_key *key,
2794 int level, u64 hint,
2796 enum btrfs_lock_nesting nest);
2797 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2799 struct extent_buffer *buf,
2800 u64 parent, int last_ref);
2801 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2802 struct btrfs_root *root, u64 owner,
2803 u64 offset, u64 ram_bytes,
2804 struct btrfs_key *ins);
2805 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2806 u64 root_objectid, u64 owner, u64 offset,
2807 struct btrfs_key *ins);
2808 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2809 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2810 struct btrfs_key *ins, int is_data, int delalloc);
2811 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2812 struct extent_buffer *buf, int full_backref);
2813 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2814 struct extent_buffer *buf, int full_backref);
2815 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2816 struct extent_buffer *eb, u64 flags, int level);
2817 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2819 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2820 u64 start, u64 len, int delalloc);
2821 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2823 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2824 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2825 struct btrfs_ref *generic_ref);
2827 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2830 * Different levels for to flush space when doing space reservations.
2832 * The higher the level, the more methods we try to reclaim space.
2834 enum btrfs_reserve_flush_enum {
2835 /* If we are in the transaction, we can't flush anything.*/
2836 BTRFS_RESERVE_NO_FLUSH,
2840 * - Running delayed inode items
2841 * - Allocating a new chunk
2843 BTRFS_RESERVE_FLUSH_LIMIT,
2847 * - Running delayed inode items
2848 * - Running delayed refs
2849 * - Running delalloc and waiting for ordered extents
2850 * - Allocating a new chunk
2852 BTRFS_RESERVE_FLUSH_EVICT,
2855 * Flush space by above mentioned methods and by:
2856 * - Running delayed iputs
2857 * - Committing transaction
2859 * Can be interrupted by a fatal signal.
2861 BTRFS_RESERVE_FLUSH_DATA,
2862 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2863 BTRFS_RESERVE_FLUSH_ALL,
2866 * Pretty much the same as FLUSH_ALL, but can also steal space from
2869 * Can be interrupted by a fatal signal.
2871 BTRFS_RESERVE_FLUSH_ALL_STEAL,
2874 enum btrfs_flush_state {
2875 FLUSH_DELAYED_ITEMS_NR = 1,
2876 FLUSH_DELAYED_ITEMS = 2,
2877 FLUSH_DELAYED_REFS_NR = 3,
2878 FLUSH_DELAYED_REFS = 4,
2880 FLUSH_DELALLOC_WAIT = 6,
2881 FLUSH_DELALLOC_FULL = 7,
2883 ALLOC_CHUNK_FORCE = 9,
2884 RUN_DELAYED_IPUTS = 10,
2888 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2889 struct btrfs_block_rsv *rsv,
2890 int nitems, bool use_global_rsv);
2891 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2892 struct btrfs_block_rsv *rsv);
2893 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2895 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes,
2896 u64 disk_num_bytes, bool noflush);
2897 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2898 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2899 u64 start, u64 end);
2900 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2901 u64 num_bytes, u64 *actual_bytes);
2902 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2904 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2905 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2906 struct btrfs_fs_info *fs_info);
2907 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2908 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2909 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2912 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2914 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2915 int btrfs_previous_item(struct btrfs_root *root,
2916 struct btrfs_path *path, u64 min_objectid,
2918 int btrfs_previous_extent_item(struct btrfs_root *root,
2919 struct btrfs_path *path, u64 min_objectid);
2920 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2921 struct btrfs_path *path,
2922 const struct btrfs_key *new_key);
2923 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2924 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2925 struct btrfs_key *key, int lowest_level,
2927 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2928 struct btrfs_path *path,
2930 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2933 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2934 struct btrfs_root *root, struct extent_buffer *buf,
2935 struct extent_buffer *parent, int parent_slot,
2936 struct extent_buffer **cow_ret,
2937 enum btrfs_lock_nesting nest);
2938 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2939 struct btrfs_root *root,
2940 struct extent_buffer *buf,
2941 struct extent_buffer **cow_ret, u64 new_root_objectid);
2942 int btrfs_block_can_be_shared(struct btrfs_root *root,
2943 struct extent_buffer *buf);
2944 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2945 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2946 int btrfs_split_item(struct btrfs_trans_handle *trans,
2947 struct btrfs_root *root,
2948 struct btrfs_path *path,
2949 const struct btrfs_key *new_key,
2950 unsigned long split_offset);
2951 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2952 struct btrfs_root *root,
2953 struct btrfs_path *path,
2954 const struct btrfs_key *new_key);
2955 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2956 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2957 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2958 const struct btrfs_key *key, struct btrfs_path *p,
2959 int ins_len, int cow);
2960 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2961 struct btrfs_path *p, u64 time_seq);
2962 int btrfs_search_slot_for_read(struct btrfs_root *root,
2963 const struct btrfs_key *key,
2964 struct btrfs_path *p, int find_higher,
2966 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2967 struct btrfs_root *root, struct extent_buffer *parent,
2968 int start_slot, u64 *last_ret,
2969 struct btrfs_key *progress);
2970 void btrfs_release_path(struct btrfs_path *p);
2971 struct btrfs_path *btrfs_alloc_path(void);
2972 void btrfs_free_path(struct btrfs_path *p);
2974 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2975 struct btrfs_path *path, int slot, int nr);
2976 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2977 struct btrfs_root *root,
2978 struct btrfs_path *path)
2980 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2984 * Describes a batch of items to insert in a btree. This is used by
2985 * btrfs_insert_empty_items().
2987 struct btrfs_item_batch {
2989 * Pointer to an array containing the keys of the items to insert (in
2992 const struct btrfs_key *keys;
2993 /* Pointer to an array containing the data size for each item to insert. */
2994 const u32 *data_sizes;
2996 * The sum of data sizes for all items. The caller can compute this while
2997 * setting up the data_sizes array, so it ends up being more efficient
2998 * than having btrfs_insert_empty_items() or setup_item_for_insert()
2999 * doing it, as it would avoid an extra loop over a potentially large
3000 * array, and in the case of setup_item_for_insert(), we would be doing
3001 * it while holding a write lock on a leaf and often on upper level nodes
3002 * too, unnecessarily increasing the size of a critical section.
3004 u32 total_data_size;
3005 /* Size of the keys and data_sizes arrays (number of items in the batch). */
3009 void btrfs_setup_item_for_insert(struct btrfs_root *root,
3010 struct btrfs_path *path,
3011 const struct btrfs_key *key,
3013 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3014 const struct btrfs_key *key, void *data, u32 data_size);
3015 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3016 struct btrfs_root *root,
3017 struct btrfs_path *path,
3018 const struct btrfs_item_batch *batch);
3020 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3021 struct btrfs_root *root,
3022 struct btrfs_path *path,
3023 const struct btrfs_key *key,
3026 struct btrfs_item_batch batch;
3029 batch.data_sizes = &data_size;
3030 batch.total_data_size = data_size;
3033 return btrfs_insert_empty_items(trans, root, path, &batch);
3036 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3037 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3040 int btrfs_search_backwards(struct btrfs_root *root, struct btrfs_key *key,
3041 struct btrfs_path *path);
3043 int btrfs_get_next_valid_item(struct btrfs_root *root, struct btrfs_key *key,
3044 struct btrfs_path *path);
3047 * Search in @root for a given @key, and store the slot found in @found_key.
3049 * @root: The root node of the tree.
3050 * @key: The key we are looking for.
3051 * @found_key: Will hold the found item.
3052 * @path: Holds the current slot/leaf.
3053 * @iter_ret: Contains the value returned from btrfs_search_slot or
3054 * btrfs_get_next_valid_item, whichever was executed last.
3056 * The @iter_ret is an output variable that will contain the return value of
3057 * btrfs_search_slot, if it encountered an error, or the value returned from
3058 * btrfs_get_next_valid_item otherwise. That return value can be 0, if a valid
3059 * slot was found, 1 if there were no more leaves, and <0 if there was an error.
3061 * It's recommended to use a separate variable for iter_ret and then use it to
3062 * set the function return value so there's no confusion of the 0/1/errno
3063 * values stemming from btrfs_search_slot.
3065 #define btrfs_for_each_slot(root, key, found_key, path, iter_ret) \
3066 for (iter_ret = btrfs_search_slot(NULL, (root), (key), (path), 0, 0); \
3067 (iter_ret) >= 0 && \
3068 (iter_ret = btrfs_get_next_valid_item((root), (found_key), (path))) == 0; \
3069 (path)->slots[0]++ \
3072 static inline int btrfs_next_old_item(struct btrfs_root *root,
3073 struct btrfs_path *p, u64 time_seq)
3076 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3077 return btrfs_next_old_leaf(root, p, time_seq);
3082 * Search the tree again to find a leaf with greater keys.
3084 * Returns 0 if it found something or 1 if there are no greater leaves.
3085 * Returns < 0 on error.
3087 static inline int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
3089 return btrfs_next_old_leaf(root, path, 0);
3092 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3094 return btrfs_next_old_item(root, p, 0);
3096 int btrfs_leaf_free_space(struct extent_buffer *leaf);
3097 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
3099 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3100 struct btrfs_root *root,
3101 struct extent_buffer *node,
3102 struct extent_buffer *parent);
3103 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3106 * Do it this way so we only ever do one test_bit in the normal case.
3108 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
3109 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
3117 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3118 * anything except sleeping. This function is used to check the status of
3120 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
3121 * since setting and checking for SB_RDONLY in the superblock's flags is not
3124 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
3126 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
3127 btrfs_fs_closing(fs_info);
3130 static inline void btrfs_set_sb_rdonly(struct super_block *sb)
3132 sb->s_flags |= SB_RDONLY;
3133 set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3136 static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
3138 sb->s_flags &= ~SB_RDONLY;
3139 clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3143 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3144 u64 ref_id, u64 dirid, u64 sequence, const char *name,
3146 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3147 u64 ref_id, u64 dirid, u64 *sequence, const char *name,
3149 int btrfs_del_root(struct btrfs_trans_handle *trans,
3150 const struct btrfs_key *key);
3151 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3152 const struct btrfs_key *key,
3153 struct btrfs_root_item *item);
3154 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3155 struct btrfs_root *root,
3156 struct btrfs_key *key,
3157 struct btrfs_root_item *item);
3158 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3159 struct btrfs_path *path, struct btrfs_root_item *root_item,
3160 struct btrfs_key *root_key);
3161 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3162 void btrfs_set_root_node(struct btrfs_root_item *item,
3163 struct extent_buffer *node);
3164 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3165 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3166 struct btrfs_root *root);
3169 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3171 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3173 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3176 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3177 const char *name, int name_len);
3178 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3179 int name_len, struct btrfs_inode *dir,
3180 struct btrfs_key *location, u8 type, u64 index);
3181 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3182 struct btrfs_root *root,
3183 struct btrfs_path *path, u64 dir,
3184 const char *name, int name_len,
3186 struct btrfs_dir_item *
3187 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3188 struct btrfs_root *root,
3189 struct btrfs_path *path, u64 dir,
3190 u64 index, const char *name, int name_len,
3192 struct btrfs_dir_item *
3193 btrfs_search_dir_index_item(struct btrfs_root *root,
3194 struct btrfs_path *path, u64 dirid,
3195 const char *name, int name_len);
3196 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3197 struct btrfs_root *root,
3198 struct btrfs_path *path,
3199 struct btrfs_dir_item *di);
3200 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3201 struct btrfs_root *root,
3202 struct btrfs_path *path, u64 objectid,
3203 const char *name, u16 name_len,
3204 const void *data, u16 data_len);
3205 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3206 struct btrfs_root *root,
3207 struct btrfs_path *path, u64 dir,
3208 const char *name, u16 name_len,
3210 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3211 struct btrfs_path *path,
3216 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3217 struct btrfs_root *root, u64 offset);
3218 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3219 struct btrfs_root *root, u64 offset);
3220 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3223 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3224 struct btrfs_root *root, u64 bytenr, u64 len);
3225 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3226 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3227 struct btrfs_root *root,
3228 u64 objectid, u64 pos,
3229 u64 disk_offset, u64 disk_num_bytes,
3230 u64 num_bytes, u64 offset, u64 ram_bytes,
3231 u8 compression, u8 encryption, u16 other_encoding);
3232 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3233 struct btrfs_root *root,
3234 struct btrfs_path *path, u64 objectid,
3235 u64 bytenr, int mod);
3236 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3237 struct btrfs_root *root,
3238 struct btrfs_ordered_sum *sums);
3239 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3240 u64 offset, bool one_ordered);
3241 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3242 struct list_head *list, int search_commit);
3243 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3244 const struct btrfs_path *path,
3245 struct btrfs_file_extent_item *fi,
3246 const bool new_inline,
3247 struct extent_map *em);
3248 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3250 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3252 void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3253 u64 btrfs_file_extent_end(const struct btrfs_path *path);
3256 void btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3257 int mirror_num, enum btrfs_compression_type compress_type);
3258 unsigned int btrfs_verify_data_csum(struct btrfs_bio *bbio,
3259 u32 bio_offset, struct page *page,
3260 u64 start, u64 end);
3261 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3262 u64 start, u64 len);
3263 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3264 u64 *orig_start, u64 *orig_block_len,
3265 u64 *ram_bytes, bool strict);
3267 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3268 struct btrfs_inode *inode);
3269 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3270 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3271 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3272 struct btrfs_inode *dir, struct btrfs_inode *inode,
3273 const char *name, int name_len);
3274 int btrfs_add_link(struct btrfs_trans_handle *trans,
3275 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3276 const char *name, int name_len, int add_backref, u64 index);
3277 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3278 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3281 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3282 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3283 bool in_reclaim_context);
3284 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3285 unsigned int extra_bits,
3286 struct extent_state **cached_state);
3287 struct btrfs_new_inode_args {
3290 struct dentry *dentry;
3291 struct inode *inode;
3296 * Output from btrfs_new_inode_prepare(), input to
3297 * btrfs_create_new_inode().
3299 struct posix_acl *default_acl;
3300 struct posix_acl *acl;
3302 int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args,
3303 unsigned int *trans_num_items);
3304 int btrfs_create_new_inode(struct btrfs_trans_handle *trans,
3305 struct btrfs_new_inode_args *args);
3306 void btrfs_new_inode_args_destroy(struct btrfs_new_inode_args *args);
3307 struct inode *btrfs_new_subvol_inode(struct user_namespace *mnt_userns,
3309 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3311 void btrfs_clear_delalloc_extent(struct inode *inode,
3312 struct extent_state *state, unsigned *bits);
3313 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3314 struct extent_state *other);
3315 void btrfs_split_delalloc_extent(struct inode *inode,
3316 struct extent_state *orig, u64 split);
3317 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3318 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3319 void btrfs_evict_inode(struct inode *inode);
3320 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3321 struct inode *btrfs_alloc_inode(struct super_block *sb);
3322 void btrfs_destroy_inode(struct inode *inode);
3323 void btrfs_free_inode(struct inode *inode);
3324 int btrfs_drop_inode(struct inode *inode);
3325 int __init btrfs_init_cachep(void);
3326 void __cold btrfs_destroy_cachep(void);
3327 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3328 struct btrfs_root *root, struct btrfs_path *path);
3329 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3330 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3331 struct page *page, size_t pg_offset,
3332 u64 start, u64 end);
3333 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3334 struct btrfs_root *root, struct btrfs_inode *inode);
3335 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3336 struct btrfs_root *root, struct btrfs_inode *inode);
3337 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3338 struct btrfs_inode *inode);
3339 int btrfs_orphan_cleanup(struct btrfs_root *root);
3340 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3341 void btrfs_add_delayed_iput(struct inode *inode);
3342 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3343 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3344 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3345 u64 start, u64 num_bytes, u64 min_size,
3346 loff_t actual_len, u64 *alloc_hint);
3347 int btrfs_prealloc_file_range_trans(struct inode *inode,
3348 struct btrfs_trans_handle *trans, int mode,
3349 u64 start, u64 num_bytes, u64 min_size,
3350 loff_t actual_len, u64 *alloc_hint);
3351 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3352 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3353 struct writeback_control *wbc);
3354 int btrfs_writepage_cow_fixup(struct page *page);
3355 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3356 struct page *page, u64 start,
3357 u64 end, bool uptodate);
3358 ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter,
3359 struct btrfs_ioctl_encoded_io_args *encoded);
3360 ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
3361 const struct btrfs_ioctl_encoded_io_args *encoded);
3363 ssize_t btrfs_dio_rw(struct kiocb *iocb, struct iov_iter *iter, size_t done_before);
3365 extern const struct dentry_operations btrfs_dentry_operations;
3367 /* Inode locking type flags, by default the exclusive lock is taken */
3368 #define BTRFS_ILOCK_SHARED (1U << 0)
3369 #define BTRFS_ILOCK_TRY (1U << 1)
3370 #define BTRFS_ILOCK_MMAP (1U << 2)
3372 int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3373 void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3374 void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3375 const u64 add_bytes,
3376 const u64 del_bytes);
3377 void btrfs_assert_inode_range_clean(struct btrfs_inode *inode, u64 start, u64 end);
3380 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3381 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3382 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3383 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3384 struct dentry *dentry, struct fileattr *fa);
3385 int btrfs_ioctl_get_supported_features(void __user *arg);
3386 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3387 int __pure btrfs_is_empty_uuid(u8 *uuid);
3388 int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
3389 struct btrfs_ioctl_defrag_range_args *range,
3390 u64 newer_than, unsigned long max_to_defrag);
3391 void btrfs_get_block_group_info(struct list_head *groups_list,
3392 struct btrfs_ioctl_space_info *space);
3393 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3394 struct btrfs_ioctl_balance_args *bargs);
3395 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3396 enum btrfs_exclusive_operation type);
3397 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3398 enum btrfs_exclusive_operation type);
3399 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3400 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3401 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
3402 enum btrfs_exclusive_operation op);
3406 int __init btrfs_auto_defrag_init(void);
3407 void __cold btrfs_auto_defrag_exit(void);
3408 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3409 struct btrfs_inode *inode, u32 extent_thresh);
3410 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3411 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3412 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3413 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3415 extern const struct file_operations btrfs_file_operations;
3416 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3417 struct btrfs_root *root, struct btrfs_inode *inode,
3418 struct btrfs_drop_extents_args *args);
3419 int btrfs_replace_file_extents(struct btrfs_inode *inode,
3420 struct btrfs_path *path, const u64 start,
3422 struct btrfs_replace_extent_info *extent_info,
3423 struct btrfs_trans_handle **trans_out);
3424 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3425 struct btrfs_inode *inode, u64 start, u64 end);
3426 ssize_t btrfs_do_write_iter(struct kiocb *iocb, struct iov_iter *from,
3427 const struct btrfs_ioctl_encoded_io_args *encoded);
3428 int btrfs_release_file(struct inode *inode, struct file *file);
3429 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3430 size_t num_pages, loff_t pos, size_t write_bytes,
3431 struct extent_state **cached, bool noreserve);
3432 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3433 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3434 size_t *write_bytes);
3435 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3438 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3439 struct btrfs_root *root);
3442 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3443 unsigned long new_flags);
3444 int btrfs_sync_fs(struct super_block *sb, int wait);
3445 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3446 u64 subvol_objectid);
3448 static inline __printf(2, 3) __cold
3449 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3453 #ifdef CONFIG_PRINTK_INDEX
3455 #define btrfs_printk(fs_info, fmt, args...) \
3457 printk_index_subsys_emit("%sBTRFS %s (device %s): ", NULL, fmt); \
3458 _btrfs_printk(fs_info, fmt, ##args); \
3463 void _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3465 #elif defined(CONFIG_PRINTK)
3467 #define btrfs_printk(fs_info, fmt, args...) \
3468 _btrfs_printk(fs_info, fmt, ##args)
3472 void _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3476 #define btrfs_printk(fs_info, fmt, args...) \
3477 btrfs_no_printk(fs_info, fmt, ##args)
3480 #define btrfs_emerg(fs_info, fmt, args...) \
3481 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3482 #define btrfs_alert(fs_info, fmt, args...) \
3483 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3484 #define btrfs_crit(fs_info, fmt, args...) \
3485 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3486 #define btrfs_err(fs_info, fmt, args...) \
3487 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3488 #define btrfs_warn(fs_info, fmt, args...) \
3489 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3490 #define btrfs_notice(fs_info, fmt, args...) \
3491 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3492 #define btrfs_info(fs_info, fmt, args...) \
3493 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3496 * Wrappers that use printk_in_rcu
3498 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3499 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3500 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3501 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3502 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3503 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3504 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3505 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3506 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3507 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3508 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3509 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3510 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3511 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3514 * Wrappers that use a ratelimited printk_in_rcu
3516 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3517 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3518 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3519 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3520 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3521 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3522 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3523 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3524 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3525 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3526 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3527 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3528 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3529 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3532 * Wrappers that use a ratelimited printk
3534 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3535 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3536 #define btrfs_alert_rl(fs_info, fmt, args...) \
3537 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3538 #define btrfs_crit_rl(fs_info, fmt, args...) \
3539 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3540 #define btrfs_err_rl(fs_info, fmt, args...) \
3541 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3542 #define btrfs_warn_rl(fs_info, fmt, args...) \
3543 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3544 #define btrfs_notice_rl(fs_info, fmt, args...) \
3545 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3546 #define btrfs_info_rl(fs_info, fmt, args...) \
3547 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3549 #if defined(CONFIG_DYNAMIC_DEBUG)
3550 #define btrfs_debug(fs_info, fmt, args...) \
3551 _dynamic_func_call_no_desc(fmt, btrfs_printk, \
3552 fs_info, KERN_DEBUG fmt, ##args)
3553 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3554 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \
3555 fs_info, KERN_DEBUG fmt, ##args)
3556 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3557 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \
3558 fs_info, KERN_DEBUG fmt, ##args)
3559 #define btrfs_debug_rl(fs_info, fmt, args...) \
3560 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \
3561 fs_info, KERN_DEBUG fmt, ##args)
3562 #elif defined(DEBUG)
3563 #define btrfs_debug(fs_info, fmt, args...) \
3564 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3565 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3566 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3567 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3568 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3569 #define btrfs_debug_rl(fs_info, fmt, args...) \
3570 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3572 #define btrfs_debug(fs_info, fmt, args...) \
3573 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3574 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3575 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3576 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3577 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3578 #define btrfs_debug_rl(fs_info, fmt, args...) \
3579 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3582 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3585 btrfs_printk(fs_info, fmt, ##args); \
3586 rcu_read_unlock(); \
3589 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \
3592 btrfs_no_printk(fs_info, fmt, ##args); \
3593 rcu_read_unlock(); \
3596 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3598 static DEFINE_RATELIMIT_STATE(_rs, \
3599 DEFAULT_RATELIMIT_INTERVAL, \
3600 DEFAULT_RATELIMIT_BURST); \
3601 if (__ratelimit(&_rs)) \
3602 btrfs_printk(fs_info, fmt, ##args); \
3605 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3608 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3609 rcu_read_unlock(); \
3612 #ifdef CONFIG_BTRFS_ASSERT
3614 static inline void assertfail(const char *expr, const char *file, int line)
3616 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3620 #define ASSERT(expr) \
3621 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3624 static inline void assertfail(const char *expr, const char* file, int line) { }
3625 #define ASSERT(expr) (void)(expr)
3628 #if BITS_PER_LONG == 32
3629 #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3631 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3632 * addresses of extents.
3634 * For 4K page size it's about 10T, for 64K it's 160T.
3636 #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3637 void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3638 void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3642 * Get the correct offset inside the page of extent buffer.
3644 * @eb: target extent buffer
3645 * @start: offset inside the extent buffer
3647 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3649 static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3650 unsigned long offset)
3653 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3654 * to PAGE_SIZE, thus adding it won't cause any difference.
3656 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3657 * to the eb, thus we have to take the eb->start into consideration.
3659 return offset_in_page(offset + eb->start);
3662 static inline unsigned long get_eb_page_index(unsigned long offset)
3665 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3667 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3668 * and have ensured that all tree blocks are contained in one page,
3669 * thus we always get index == 0.
3671 return offset >> PAGE_SHIFT;
3675 * Use that for functions that are conditionally exported for sanity tests but
3678 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3679 #define EXPORT_FOR_TESTS static
3681 #define EXPORT_FOR_TESTS
3685 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3688 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3693 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3694 unsigned int line, int errno, const char *fmt, ...);
3696 const char * __attribute_const__ btrfs_decode_error(int errno);
3699 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3700 const char *function,
3701 unsigned int line, int errno);
3704 * Call btrfs_abort_transaction as early as possible when an error condition is
3705 * detected, that way the exact line number is reported.
3707 #define btrfs_abort_transaction(trans, errno) \
3709 /* Report first abort since mount */ \
3710 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3711 &((trans)->fs_info->fs_state))) { \
3712 if ((errno) != -EIO && (errno) != -EROFS) { \
3713 WARN(1, KERN_DEBUG \
3714 "BTRFS: Transaction aborted (error %d)\n", \
3717 btrfs_debug((trans)->fs_info, \
3718 "Transaction aborted (error %d)", \
3722 __btrfs_abort_transaction((trans), __func__, \
3723 __LINE__, (errno)); \
3726 #ifdef CONFIG_PRINTK_INDEX
3728 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3730 printk_index_subsys_emit( \
3731 "BTRFS: error (device %s%s) in %s:%d: errno=%d %s", \
3733 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3734 (errno), fmt, ##args); \
3739 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3740 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3741 (errno), fmt, ##args)
3745 #define BTRFS_FS_ERROR(fs_info) (unlikely(test_bit(BTRFS_FS_STATE_ERROR, \
3746 &(fs_info)->fs_state)))
3747 #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \
3748 (unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \
3749 &(fs_info)->fs_state)))
3753 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3754 unsigned int line, int errno, const char *fmt, ...);
3756 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3757 * will panic(). Otherwise we BUG() here.
3759 #define btrfs_panic(fs_info, errno, fmt, args...) \
3761 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3766 /* compatibility and incompatibility defines */
3768 #define btrfs_set_fs_incompat(__fs_info, opt) \
3769 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3772 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3773 u64 flag, const char* name)
3775 struct btrfs_super_block *disk_super;
3778 disk_super = fs_info->super_copy;
3779 features = btrfs_super_incompat_flags(disk_super);
3780 if (!(features & flag)) {
3781 spin_lock(&fs_info->super_lock);
3782 features = btrfs_super_incompat_flags(disk_super);
3783 if (!(features & flag)) {
3785 btrfs_set_super_incompat_flags(disk_super, features);
3787 "setting incompat feature flag for %s (0x%llx)",
3790 spin_unlock(&fs_info->super_lock);
3794 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3795 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3798 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3799 u64 flag, const char* name)
3801 struct btrfs_super_block *disk_super;
3804 disk_super = fs_info->super_copy;
3805 features = btrfs_super_incompat_flags(disk_super);
3806 if (features & flag) {
3807 spin_lock(&fs_info->super_lock);
3808 features = btrfs_super_incompat_flags(disk_super);
3809 if (features & flag) {
3811 btrfs_set_super_incompat_flags(disk_super, features);
3813 "clearing incompat feature flag for %s (0x%llx)",
3816 spin_unlock(&fs_info->super_lock);
3820 #define btrfs_fs_incompat(fs_info, opt) \
3821 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3823 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3825 struct btrfs_super_block *disk_super;
3826 disk_super = fs_info->super_copy;
3827 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3830 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3831 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3834 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3835 u64 flag, const char *name)
3837 struct btrfs_super_block *disk_super;
3840 disk_super = fs_info->super_copy;
3841 features = btrfs_super_compat_ro_flags(disk_super);
3842 if (!(features & flag)) {
3843 spin_lock(&fs_info->super_lock);
3844 features = btrfs_super_compat_ro_flags(disk_super);
3845 if (!(features & flag)) {
3847 btrfs_set_super_compat_ro_flags(disk_super, features);
3849 "setting compat-ro feature flag for %s (0x%llx)",
3852 spin_unlock(&fs_info->super_lock);
3856 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3857 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3860 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3861 u64 flag, const char *name)
3863 struct btrfs_super_block *disk_super;
3866 disk_super = fs_info->super_copy;
3867 features = btrfs_super_compat_ro_flags(disk_super);
3868 if (features & flag) {
3869 spin_lock(&fs_info->super_lock);
3870 features = btrfs_super_compat_ro_flags(disk_super);
3871 if (features & flag) {
3873 btrfs_set_super_compat_ro_flags(disk_super, features);
3875 "clearing compat-ro feature flag for %s (0x%llx)",
3878 spin_unlock(&fs_info->super_lock);
3882 #define btrfs_fs_compat_ro(fs_info, opt) \
3883 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3885 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3887 struct btrfs_super_block *disk_super;
3888 disk_super = fs_info->super_copy;
3889 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3893 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3894 struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu);
3895 int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3896 struct posix_acl *acl, int type);
3897 int __btrfs_set_acl(struct btrfs_trans_handle *trans, struct inode *inode,
3898 struct posix_acl *acl, int type);
3900 #define btrfs_get_acl NULL
3901 #define btrfs_set_acl NULL
3902 static inline int __btrfs_set_acl(struct btrfs_trans_handle *trans,
3903 struct inode *inode, struct posix_acl *acl,
3911 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3912 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3913 struct btrfs_root *root);
3914 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3915 struct btrfs_root *root);
3916 int btrfs_recover_relocation(struct btrfs_fs_info *fs_info);
3917 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3918 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3919 struct btrfs_root *root, struct extent_buffer *buf,
3920 struct extent_buffer *cow);
3921 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3922 u64 *bytes_to_reserve);
3923 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3924 struct btrfs_pending_snapshot *pending);
3925 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3926 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3928 int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3931 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3932 u64 end, struct btrfs_scrub_progress *progress,
3933 int readonly, int is_dev_replace);
3934 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3935 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3936 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3937 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3938 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3939 struct btrfs_scrub_progress *progress);
3940 static inline void btrfs_init_full_stripe_locks_tree(
3941 struct btrfs_full_stripe_locks_tree *locks_root)
3943 locks_root->root = RB_ROOT;
3944 mutex_init(&locks_root->lock);
3948 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3949 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3950 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3952 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3954 btrfs_bio_counter_sub(fs_info, 1);
3957 static inline int is_fstree(u64 rootid)
3959 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3960 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3961 !btrfs_qgroup_level(rootid)))
3966 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3968 return signal_pending(current);
3972 #ifdef CONFIG_FS_VERITY
3974 extern const struct fsverity_operations btrfs_verityops;
3975 int btrfs_drop_verity_items(struct btrfs_inode *inode);
3977 BTRFS_SETGET_FUNCS(verity_descriptor_encryption, struct btrfs_verity_descriptor_item,
3979 BTRFS_SETGET_FUNCS(verity_descriptor_size, struct btrfs_verity_descriptor_item,
3981 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_encryption,
3982 struct btrfs_verity_descriptor_item, encryption, 8);
3983 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_size,
3984 struct btrfs_verity_descriptor_item, size, 64);
3988 static inline int btrfs_drop_verity_items(struct btrfs_inode *inode)
3995 /* Sanity test specific functions */
3996 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3997 void btrfs_test_destroy_inode(struct inode *inode);
3998 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
4000 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
4003 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
4009 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
4011 return fs_info->zone_size > 0;
4014 static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root)
4016 return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;
4020 * We use page status Private2 to indicate there is an ordered extent with
4023 * Rename the Private2 accessors to Ordered, to improve readability.
4025 #define PageOrdered(page) PagePrivate2(page)
4026 #define SetPageOrdered(page) SetPagePrivate2(page)
4027 #define ClearPageOrdered(page) ClearPagePrivate2(page)
4028 #define folio_test_ordered(folio) folio_test_private_2(folio)
4029 #define folio_set_ordered(folio) folio_set_private_2(folio)
4030 #define folio_clear_ordered(folio) folio_clear_private_2(folio)