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 spinlock_t fs_roots_radix_lock;
679 struct radix_tree_root fs_roots_radix;
681 /* block group cache stuff */
682 rwlock_t block_group_cache_lock;
683 struct rb_root_cached block_group_cache_tree;
685 /* keep track of unallocated space */
686 atomic64_t free_chunk_space;
688 /* Track ranges which are used by log trees blocks/logged data extents */
689 struct extent_io_tree excluded_extents;
691 /* logical->physical extent mapping */
692 struct extent_map_tree mapping_tree;
695 * block reservation for extent, checksum, root tree and
696 * delayed dir index item
698 struct btrfs_block_rsv global_block_rsv;
699 /* block reservation for metadata operations */
700 struct btrfs_block_rsv trans_block_rsv;
701 /* block reservation for chunk tree */
702 struct btrfs_block_rsv chunk_block_rsv;
703 /* block reservation for delayed operations */
704 struct btrfs_block_rsv delayed_block_rsv;
705 /* block reservation for delayed refs */
706 struct btrfs_block_rsv delayed_refs_rsv;
708 struct btrfs_block_rsv empty_block_rsv;
711 u64 last_trans_committed;
713 * Generation of the last transaction used for block group relocation
714 * since the filesystem was last mounted (or 0 if none happened yet).
715 * Must be written and read while holding btrfs_fs_info::commit_root_sem.
717 u64 last_reloc_trans;
718 u64 avg_delayed_ref_runtime;
721 * this is updated to the current trans every time a full commit
722 * is required instead of the faster short fsync log commits
724 u64 last_trans_log_full_commit;
725 unsigned long mount_opt;
727 * Track requests for actions that need to be done during transaction
728 * commit (like for some mount options).
730 unsigned long pending_changes;
731 unsigned long compress_type:4;
732 unsigned int compress_level;
735 * It is a suggestive number, the read side is safe even it gets a
736 * wrong number because we will write out the data into a regular
737 * extent. The write side(mount/remount) is under ->s_umount lock,
738 * so it is also safe.
742 struct btrfs_transaction *running_transaction;
743 wait_queue_head_t transaction_throttle;
744 wait_queue_head_t transaction_wait;
745 wait_queue_head_t transaction_blocked_wait;
746 wait_queue_head_t async_submit_wait;
749 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
750 * when they are updated.
752 * Because we do not clear the flags for ever, so we needn't use
753 * the lock on the read side.
755 * We also needn't use the lock when we mount the fs, because
756 * there is no other task which will update the flag.
758 spinlock_t super_lock;
759 struct btrfs_super_block *super_copy;
760 struct btrfs_super_block *super_for_commit;
761 struct super_block *sb;
762 struct inode *btree_inode;
763 struct mutex tree_log_mutex;
764 struct mutex transaction_kthread_mutex;
765 struct mutex cleaner_mutex;
766 struct mutex chunk_mutex;
769 * this is taken to make sure we don't set block groups ro after
770 * the free space cache has been allocated on them
772 struct mutex ro_block_group_mutex;
774 /* this is used during read/modify/write to make sure
775 * no two ios are trying to mod the same stripe at the same
778 struct btrfs_stripe_hash_table *stripe_hash_table;
781 * this protects the ordered operations list only while we are
782 * processing all of the entries on it. This way we make
783 * sure the commit code doesn't find the list temporarily empty
784 * because another function happens to be doing non-waiting preflush
785 * before jumping into the main commit.
787 struct mutex ordered_operations_mutex;
789 struct rw_semaphore commit_root_sem;
791 struct rw_semaphore cleanup_work_sem;
793 struct rw_semaphore subvol_sem;
795 spinlock_t trans_lock;
797 * the reloc mutex goes with the trans lock, it is taken
798 * during commit to protect us from the relocation code
800 struct mutex reloc_mutex;
802 struct list_head trans_list;
803 struct list_head dead_roots;
804 struct list_head caching_block_groups;
806 spinlock_t delayed_iput_lock;
807 struct list_head delayed_iputs;
808 atomic_t nr_delayed_iputs;
809 wait_queue_head_t delayed_iputs_wait;
811 atomic64_t tree_mod_seq;
813 /* this protects tree_mod_log and tree_mod_seq_list */
814 rwlock_t tree_mod_log_lock;
815 struct rb_root tree_mod_log;
816 struct list_head tree_mod_seq_list;
818 atomic_t async_delalloc_pages;
821 * this is used to protect the following list -- ordered_roots.
823 spinlock_t ordered_root_lock;
826 * all fs/file tree roots in which there are data=ordered extents
827 * pending writeback are added into this list.
829 * these can span multiple transactions and basically include
830 * every dirty data page that isn't from nodatacow
832 struct list_head ordered_roots;
834 struct mutex delalloc_root_mutex;
835 spinlock_t delalloc_root_lock;
836 /* all fs/file tree roots that have delalloc inodes. */
837 struct list_head delalloc_roots;
840 * there is a pool of worker threads for checksumming during writes
841 * and a pool for checksumming after reads. This is because readers
842 * can run with FS locks held, and the writers may be waiting for
843 * those locks. We don't want ordering in the pending list to cause
844 * deadlocks, and so the two are serviced separately.
846 * A third pool does submit_bio to avoid deadlocking with the other
849 struct btrfs_workqueue *workers;
850 struct btrfs_workqueue *hipri_workers;
851 struct btrfs_workqueue *delalloc_workers;
852 struct btrfs_workqueue *flush_workers;
853 struct btrfs_workqueue *endio_workers;
854 struct btrfs_workqueue *endio_meta_workers;
855 struct btrfs_workqueue *endio_raid56_workers;
856 struct workqueue_struct *rmw_workers;
857 struct btrfs_workqueue *endio_meta_write_workers;
858 struct btrfs_workqueue *endio_write_workers;
859 struct btrfs_workqueue *endio_freespace_worker;
860 struct btrfs_workqueue *caching_workers;
863 * fixup workers take dirty pages that didn't properly go through
864 * the cow mechanism and make them safe to write. It happens
865 * for the sys_munmap function call path
867 struct btrfs_workqueue *fixup_workers;
868 struct btrfs_workqueue *delayed_workers;
870 struct task_struct *transaction_kthread;
871 struct task_struct *cleaner_kthread;
872 u32 thread_pool_size;
874 struct kobject *space_info_kobj;
875 struct kobject *qgroups_kobj;
877 /* used to keep from writing metadata until there is a nice batch */
878 struct percpu_counter dirty_metadata_bytes;
879 struct percpu_counter delalloc_bytes;
880 struct percpu_counter ordered_bytes;
881 s32 dirty_metadata_batch;
884 struct list_head dirty_cowonly_roots;
886 struct btrfs_fs_devices *fs_devices;
889 * The space_info list is effectively read only after initial
890 * setup. It is populated at mount time and cleaned up after
891 * all block groups are removed. RCU is used to protect it.
893 struct list_head space_info;
895 struct btrfs_space_info *data_sinfo;
897 struct reloc_control *reloc_ctl;
899 /* data_alloc_cluster is only used in ssd_spread mode */
900 struct btrfs_free_cluster data_alloc_cluster;
902 /* all metadata allocations go through this cluster */
903 struct btrfs_free_cluster meta_alloc_cluster;
905 /* auto defrag inodes go here */
906 spinlock_t defrag_inodes_lock;
907 struct rb_root defrag_inodes;
908 atomic_t defrag_running;
910 /* Used to protect avail_{data, metadata, system}_alloc_bits */
911 seqlock_t profiles_lock;
913 * these three are in extended format (availability of single
914 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
915 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
917 u64 avail_data_alloc_bits;
918 u64 avail_metadata_alloc_bits;
919 u64 avail_system_alloc_bits;
921 /* restriper state */
922 spinlock_t balance_lock;
923 struct mutex balance_mutex;
924 atomic_t balance_pause_req;
925 atomic_t balance_cancel_req;
926 struct btrfs_balance_control *balance_ctl;
927 wait_queue_head_t balance_wait_q;
929 /* Cancellation requests for chunk relocation */
930 atomic_t reloc_cancel_req;
932 u32 data_chunk_allocations;
937 /* private scrub information */
938 struct mutex scrub_lock;
939 atomic_t scrubs_running;
940 atomic_t scrub_pause_req;
941 atomic_t scrubs_paused;
942 atomic_t scrub_cancel_req;
943 wait_queue_head_t scrub_pause_wait;
945 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
948 refcount_t scrub_workers_refcnt;
949 struct workqueue_struct *scrub_workers;
950 struct workqueue_struct *scrub_wr_completion_workers;
951 struct workqueue_struct *scrub_parity_workers;
952 struct btrfs_subpage_info *subpage_info;
954 struct btrfs_discard_ctl discard_ctl;
956 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
957 u32 check_integrity_print_mask;
959 /* is qgroup tracking in a consistent state? */
962 /* holds configuration and tracking. Protected by qgroup_lock */
963 struct rb_root qgroup_tree;
964 spinlock_t qgroup_lock;
967 * used to avoid frequently calling ulist_alloc()/ulist_free()
968 * when doing qgroup accounting, it must be protected by qgroup_lock.
970 struct ulist *qgroup_ulist;
973 * Protect user change for quota operations. If a transaction is needed,
974 * it must be started before locking this lock.
976 struct mutex qgroup_ioctl_lock;
978 /* list of dirty qgroups to be written at next commit */
979 struct list_head dirty_qgroups;
981 /* used by qgroup for an efficient tree traversal */
984 /* qgroup rescan items */
985 struct mutex qgroup_rescan_lock; /* protects the progress item */
986 struct btrfs_key qgroup_rescan_progress;
987 struct btrfs_workqueue *qgroup_rescan_workers;
988 struct completion qgroup_rescan_completion;
989 struct btrfs_work qgroup_rescan_work;
990 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */
992 /* filesystem state */
993 unsigned long fs_state;
995 struct btrfs_delayed_root *delayed_root;
997 /* Extent buffer radix tree */
998 spinlock_t buffer_lock;
999 /* Entries are eb->start / sectorsize */
1000 struct radix_tree_root buffer_radix;
1002 /* next backup root to be overwritten */
1003 int backup_root_index;
1005 /* device replace state */
1006 struct btrfs_dev_replace dev_replace;
1008 struct semaphore uuid_tree_rescan_sem;
1010 /* Used to reclaim the metadata space in the background. */
1011 struct work_struct async_reclaim_work;
1012 struct work_struct async_data_reclaim_work;
1013 struct work_struct preempt_reclaim_work;
1015 /* Reclaim partially filled block groups in the background */
1016 struct work_struct reclaim_bgs_work;
1017 struct list_head reclaim_bgs;
1018 int bg_reclaim_threshold;
1020 spinlock_t unused_bgs_lock;
1021 struct list_head unused_bgs;
1022 struct mutex unused_bg_unpin_mutex;
1023 /* Protect block groups that are going to be deleted */
1024 struct mutex reclaim_bgs_lock;
1026 /* Cached block sizes */
1029 /* ilog2 of sectorsize, use to avoid 64bit division */
1030 u32 sectorsize_bits;
1035 /* Block groups and devices containing active swapfiles. */
1036 spinlock_t swapfile_pins_lock;
1037 struct rb_root swapfile_pins;
1039 struct crypto_shash *csum_shash;
1041 /* Type of exclusive operation running, protected by super_lock */
1042 enum btrfs_exclusive_operation exclusive_operation;
1045 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1046 * if the mode is enabled
1050 struct mutex zoned_meta_io_lock;
1051 spinlock_t treelog_bg_lock;
1055 * Start of the dedicated data relocation block group, protected by
1056 * relocation_bg_lock.
1058 spinlock_t relocation_bg_lock;
1060 struct mutex zoned_data_reloc_io_lock;
1062 u64 nr_global_roots;
1064 spinlock_t zone_active_bgs_lock;
1065 struct list_head zone_active_bgs;
1067 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1068 spinlock_t ref_verify_lock;
1069 struct rb_root block_tree;
1072 #ifdef CONFIG_BTRFS_DEBUG
1073 struct kobject *debug_kobj;
1074 struct kobject *discard_debug_kobj;
1075 struct list_head allocated_roots;
1077 spinlock_t eb_leak_lock;
1078 struct list_head allocated_ebs;
1082 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1084 return sb->s_fs_info;
1088 * The state of btrfs root
1092 * btrfs_record_root_in_trans is a multi-step process, and it can race
1093 * with the balancing code. But the race is very small, and only the
1094 * first time the root is added to each transaction. So IN_TRANS_SETUP
1095 * is used to tell us when more checks are required
1097 BTRFS_ROOT_IN_TRANS_SETUP,
1100 * Set if tree blocks of this root can be shared by other roots.
1101 * Only subvolume trees and their reloc trees have this bit set.
1102 * Conflicts with TRACK_DIRTY bit.
1104 * This affects two things:
1106 * - How balance works
1107 * For shareable roots, we need to use reloc tree and do path
1108 * replacement for balance, and need various pre/post hooks for
1109 * snapshot creation to handle them.
1111 * While for non-shareable trees, we just simply do a tree search
1114 * - How dirty roots are tracked
1115 * For shareable roots, btrfs_record_root_in_trans() is needed to
1116 * track them, while non-subvolume roots have TRACK_DIRTY bit, they
1117 * don't need to set this manually.
1119 BTRFS_ROOT_SHAREABLE,
1120 BTRFS_ROOT_TRACK_DIRTY,
1121 BTRFS_ROOT_IN_RADIX,
1122 BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1123 BTRFS_ROOT_DEFRAG_RUNNING,
1124 BTRFS_ROOT_FORCE_COW,
1125 BTRFS_ROOT_MULTI_LOG_TASKS,
1127 BTRFS_ROOT_DELETING,
1130 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1132 * Set for the subvolume tree owning the reloc tree.
1134 BTRFS_ROOT_DEAD_RELOC_TREE,
1135 /* Mark dead root stored on device whose cleanup needs to be resumed */
1136 BTRFS_ROOT_DEAD_TREE,
1137 /* The root has a log tree. Used for subvolume roots and the tree root. */
1138 BTRFS_ROOT_HAS_LOG_TREE,
1139 /* Qgroup flushing is in progress */
1140 BTRFS_ROOT_QGROUP_FLUSHING,
1141 /* We started the orphan cleanup for this root. */
1142 BTRFS_ROOT_ORPHAN_CLEANUP,
1143 /* This root has a drop operation that was started previously. */
1144 BTRFS_ROOT_UNFINISHED_DROP,
1147 static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
1149 clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags);
1153 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1154 * code. For detail check comment in fs/btrfs/qgroup.c.
1156 struct btrfs_qgroup_swapped_blocks {
1158 /* RM_EMPTY_ROOT() of above blocks[] */
1160 struct rb_root blocks[BTRFS_MAX_LEVEL];
1164 * in ram representation of the tree. extent_root is used for all allocations
1165 * and for the extent tree extent_root root.
1168 struct rb_node rb_node;
1170 struct extent_buffer *node;
1172 struct extent_buffer *commit_root;
1173 struct btrfs_root *log_root;
1174 struct btrfs_root *reloc_root;
1176 unsigned long state;
1177 struct btrfs_root_item root_item;
1178 struct btrfs_key root_key;
1179 struct btrfs_fs_info *fs_info;
1180 struct extent_io_tree dirty_log_pages;
1182 struct mutex objectid_mutex;
1184 spinlock_t accounting_lock;
1185 struct btrfs_block_rsv *block_rsv;
1187 struct mutex log_mutex;
1188 wait_queue_head_t log_writer_wait;
1189 wait_queue_head_t log_commit_wait[2];
1190 struct list_head log_ctxs[2];
1191 /* Used only for log trees of subvolumes, not for the log root tree */
1192 atomic_t log_writers;
1193 atomic_t log_commit[2];
1194 /* Used only for log trees of subvolumes, not for the log root tree */
1197 /* No matter the commit succeeds or not*/
1198 int log_transid_committed;
1199 /* Just be updated when the commit succeeds. */
1200 int last_log_commit;
1201 pid_t log_start_pid;
1209 struct btrfs_key defrag_progress;
1210 struct btrfs_key defrag_max;
1212 /* The dirty list is only used by non-shareable roots */
1213 struct list_head dirty_list;
1215 struct list_head root_list;
1217 spinlock_t log_extents_lock[2];
1218 struct list_head logged_list[2];
1220 spinlock_t inode_lock;
1221 /* red-black tree that keeps track of in-memory inodes */
1222 struct rb_root inode_tree;
1225 * radix tree that keeps track of delayed nodes of every inode,
1226 * protected by inode_lock
1228 struct radix_tree_root delayed_nodes_tree;
1230 * right now this just gets used so that a root has its own devid
1231 * for stat. It may be used for more later
1235 spinlock_t root_item_lock;
1238 struct mutex delalloc_mutex;
1239 spinlock_t delalloc_lock;
1241 * all of the inodes that have delalloc bytes. It is possible for
1242 * this list to be empty even when there is still dirty data=ordered
1243 * extents waiting to finish IO.
1245 struct list_head delalloc_inodes;
1246 struct list_head delalloc_root;
1247 u64 nr_delalloc_inodes;
1249 struct mutex ordered_extent_mutex;
1251 * this is used by the balancing code to wait for all the pending
1254 spinlock_t ordered_extent_lock;
1257 * all of the data=ordered extents pending writeback
1258 * these can span multiple transactions and basically include
1259 * every dirty data page that isn't from nodatacow
1261 struct list_head ordered_extents;
1262 struct list_head ordered_root;
1263 u64 nr_ordered_extents;
1266 * Not empty if this subvolume root has gone through tree block swap
1269 * Will be used by reloc_control::dirty_subvol_roots.
1271 struct list_head reloc_dirty_list;
1274 * Number of currently running SEND ioctls to prevent
1275 * manipulation with the read-only status via SUBVOL_SETFLAGS
1277 int send_in_progress;
1279 * Number of currently running deduplication operations that have a
1280 * destination inode belonging to this root. Protected by the lock
1283 int dedupe_in_progress;
1284 /* For exclusion of snapshot creation and nocow writes */
1285 struct btrfs_drew_lock snapshot_lock;
1287 atomic_t snapshot_force_cow;
1289 /* For qgroup metadata reserved space */
1290 spinlock_t qgroup_meta_rsv_lock;
1291 u64 qgroup_meta_rsv_pertrans;
1292 u64 qgroup_meta_rsv_prealloc;
1293 wait_queue_head_t qgroup_flush_wait;
1295 /* Number of active swapfiles */
1296 atomic_t nr_swapfiles;
1298 /* Record pairs of swapped blocks for qgroup */
1299 struct btrfs_qgroup_swapped_blocks swapped_blocks;
1301 /* Used only by log trees, when logging csum items */
1302 struct extent_io_tree log_csum_range;
1304 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1308 #ifdef CONFIG_BTRFS_DEBUG
1309 struct list_head leak_list;
1314 * Structure that conveys information about an extent that is going to replace
1315 * all the extents in a file range.
1317 struct btrfs_replace_extent_info {
1323 /* Pointer to a file extent item of type regular or prealloc. */
1326 * Set to true when attempting to replace a file range with a new extent
1327 * described by this structure, set to false when attempting to clone an
1328 * existing extent into a file range.
1331 /* Indicate if we should update the inode's mtime and ctime. */
1333 /* Meaningful only if is_new_extent is true. */
1334 int qgroup_reserved;
1336 * Meaningful only if is_new_extent is true.
1337 * Used to track how many extent items we have already inserted in a
1338 * subvolume tree that refer to the extent described by this structure,
1339 * so that we know when to create a new delayed ref or update an existing
1345 /* Arguments for btrfs_drop_extents() */
1346 struct btrfs_drop_extents_args {
1347 /* Input parameters */
1350 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1351 * If 'replace_extent' is true, this must not be NULL. Also the path
1352 * is always released except if 'replace_extent' is true and
1353 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1354 * the path is kept locked.
1356 struct btrfs_path *path;
1357 /* Start offset of the range to drop extents from */
1359 /* End (exclusive, last byte + 1) of the range to drop extents from */
1361 /* If true drop all the extent maps in the range */
1364 * If true it means we want to insert a new extent after dropping all
1365 * the extents in the range. If this is true, the 'extent_item_size'
1366 * parameter must be set as well and the 'extent_inserted' field will
1367 * be set to true by btrfs_drop_extents() if it could insert the new
1369 * Note: when this is set to true the path must not be NULL.
1371 bool replace_extent;
1373 * Used if 'replace_extent' is true. Size of the file extent item to
1374 * insert after dropping all existing extents in the range
1376 u32 extent_item_size;
1378 /* Output parameters */
1381 * Set to the minimum between the input parameter 'end' and the end
1382 * (exclusive, last byte + 1) of the last dropped extent. This is always
1383 * set even if btrfs_drop_extents() returns an error.
1387 * The number of allocated bytes found in the range. This can be smaller
1388 * than the range's length when there are holes in the range.
1392 * Only set if 'replace_extent' is true. Set to true if we were able
1393 * to insert a replacement extent after dropping all extents in the
1394 * range, otherwise set to false by btrfs_drop_extents().
1395 * Also, if btrfs_drop_extents() has set this to true it means it
1396 * returned with the path locked, otherwise if it has set this to
1397 * false it has returned with the path released.
1399 bool extent_inserted;
1402 struct btrfs_file_private {
1407 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1410 return info->nodesize - sizeof(struct btrfs_header);
1413 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items)
1415 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1417 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1420 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1422 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1425 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1426 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1427 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1429 return BTRFS_MAX_ITEM_SIZE(info) -
1430 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1433 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1435 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1439 * Flags for mount options.
1441 * Note: don't forget to add new options to btrfs_show_options()
1444 BTRFS_MOUNT_NODATASUM = (1UL << 0),
1445 BTRFS_MOUNT_NODATACOW = (1UL << 1),
1446 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
1447 BTRFS_MOUNT_SSD = (1UL << 3),
1448 BTRFS_MOUNT_DEGRADED = (1UL << 4),
1449 BTRFS_MOUNT_COMPRESS = (1UL << 5),
1450 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
1451 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
1452 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
1453 BTRFS_MOUNT_NOSSD = (1UL << 9),
1454 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
1455 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
1456 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
1457 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
1458 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
1459 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
1460 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
1461 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
1462 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
1463 BTRFS_MOUNT_CHECK_INTEGRITY = (1UL << 19),
1464 BTRFS_MOUNT_CHECK_INTEGRITY_DATA = (1UL << 20),
1465 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 21),
1466 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 22),
1467 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 23),
1468 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 24),
1469 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 25),
1470 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 26),
1471 BTRFS_MOUNT_REF_VERIFY = (1UL << 27),
1472 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 28),
1473 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 29),
1474 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 30),
1477 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1478 #define BTRFS_DEFAULT_MAX_INLINE (2048)
1480 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1481 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1482 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1483 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1486 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1488 if (!btrfs_test_opt(fs_info, opt)) \
1489 btrfs_info(fs_info, fmt, ##args); \
1490 btrfs_set_opt(fs_info->mount_opt, opt); \
1493 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1495 if (btrfs_test_opt(fs_info, opt)) \
1496 btrfs_info(fs_info, fmt, ##args); \
1497 btrfs_clear_opt(fs_info->mount_opt, opt); \
1501 * Requests for changes that need to be done during transaction commit.
1503 * Internal mount options that are used for special handling of the real
1504 * mount options (eg. cannot be set during remount and have to be set during
1505 * transaction commit)
1508 #define BTRFS_PENDING_COMMIT (0)
1510 #define btrfs_test_pending(info, opt) \
1511 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1512 #define btrfs_set_pending(info, opt) \
1513 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1514 #define btrfs_clear_pending(info, opt) \
1515 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1518 * Helpers for setting pending mount option changes.
1520 * Expects corresponding macros
1521 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1523 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1525 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1526 btrfs_info((info), fmt, ##args); \
1527 btrfs_set_pending((info), SET_##opt); \
1528 btrfs_clear_pending((info), CLEAR_##opt); \
1532 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1534 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1535 btrfs_info((info), fmt, ##args); \
1536 btrfs_set_pending((info), CLEAR_##opt); \
1537 btrfs_clear_pending((info), SET_##opt); \
1544 #define BTRFS_INODE_NODATASUM (1U << 0)
1545 #define BTRFS_INODE_NODATACOW (1U << 1)
1546 #define BTRFS_INODE_READONLY (1U << 2)
1547 #define BTRFS_INODE_NOCOMPRESS (1U << 3)
1548 #define BTRFS_INODE_PREALLOC (1U << 4)
1549 #define BTRFS_INODE_SYNC (1U << 5)
1550 #define BTRFS_INODE_IMMUTABLE (1U << 6)
1551 #define BTRFS_INODE_APPEND (1U << 7)
1552 #define BTRFS_INODE_NODUMP (1U << 8)
1553 #define BTRFS_INODE_NOATIME (1U << 9)
1554 #define BTRFS_INODE_DIRSYNC (1U << 10)
1555 #define BTRFS_INODE_COMPRESS (1U << 11)
1557 #define BTRFS_INODE_ROOT_ITEM_INIT (1U << 31)
1559 #define BTRFS_INODE_FLAG_MASK \
1560 (BTRFS_INODE_NODATASUM | \
1561 BTRFS_INODE_NODATACOW | \
1562 BTRFS_INODE_READONLY | \
1563 BTRFS_INODE_NOCOMPRESS | \
1564 BTRFS_INODE_PREALLOC | \
1565 BTRFS_INODE_SYNC | \
1566 BTRFS_INODE_IMMUTABLE | \
1567 BTRFS_INODE_APPEND | \
1568 BTRFS_INODE_NODUMP | \
1569 BTRFS_INODE_NOATIME | \
1570 BTRFS_INODE_DIRSYNC | \
1571 BTRFS_INODE_COMPRESS | \
1572 BTRFS_INODE_ROOT_ITEM_INIT)
1574 #define BTRFS_INODE_RO_VERITY (1U << 0)
1576 #define BTRFS_INODE_RO_FLAG_MASK (BTRFS_INODE_RO_VERITY)
1578 struct btrfs_map_token {
1579 struct extent_buffer *eb;
1581 unsigned long offset;
1584 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1585 ((bytes) >> (fs_info)->sectorsize_bits)
1587 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1588 struct extent_buffer *eb)
1591 token->kaddr = page_address(eb->pages[0]);
1595 /* some macros to generate set/get functions for the struct fields. This
1596 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1599 #define le8_to_cpu(v) (v)
1600 #define cpu_to_le8(v) (v)
1603 static inline u8 get_unaligned_le8(const void *p)
1608 static inline void put_unaligned_le8(u8 val, void *p)
1613 #define read_eb_member(eb, ptr, type, member, result) (\
1614 read_extent_buffer(eb, (char *)(result), \
1615 ((unsigned long)(ptr)) + \
1616 offsetof(type, member), \
1617 sizeof(((type *)0)->member)))
1619 #define write_eb_member(eb, ptr, type, member, result) (\
1620 write_extent_buffer(eb, (char *)(result), \
1621 ((unsigned long)(ptr)) + \
1622 offsetof(type, member), \
1623 sizeof(((type *)0)->member)))
1625 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1626 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
1627 const void *ptr, unsigned long off); \
1628 void btrfs_set_token_##bits(struct btrfs_map_token *token, \
1629 const void *ptr, unsigned long off, \
1631 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
1632 const void *ptr, unsigned long off); \
1633 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
1634 unsigned long off, u##bits val);
1636 DECLARE_BTRFS_SETGET_BITS(8)
1637 DECLARE_BTRFS_SETGET_BITS(16)
1638 DECLARE_BTRFS_SETGET_BITS(32)
1639 DECLARE_BTRFS_SETGET_BITS(64)
1641 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1642 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1645 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1646 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1648 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1651 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1652 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1654 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
1657 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1658 return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1660 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1661 type *s, u##bits val) \
1663 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1664 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
1667 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1668 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1670 const type *p = page_address(eb->pages[0]) + \
1671 offset_in_page(eb->start); \
1672 return get_unaligned_le##bits(&p->member); \
1674 static inline void btrfs_set_##name(const struct extent_buffer *eb, \
1677 type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1678 put_unaligned_le##bits(val, &p->member); \
1681 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1682 static inline u##bits btrfs_##name(const type *s) \
1684 return get_unaligned_le##bits(&s->member); \
1686 static inline void btrfs_set_##name(type *s, u##bits val) \
1688 put_unaligned_le##bits(val, &s->member); \
1691 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1692 struct btrfs_dev_item *s)
1694 static_assert(sizeof(u64) ==
1695 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1696 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1699 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1700 struct btrfs_dev_item *s,
1703 static_assert(sizeof(u64) ==
1704 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1705 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1706 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1710 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1711 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1712 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1713 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1714 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1716 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1717 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1718 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1719 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1720 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1721 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1723 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1724 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1726 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1728 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1730 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1732 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1734 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1735 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1737 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1739 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1741 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1744 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1746 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1749 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1751 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1754 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1755 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1756 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1757 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1758 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1759 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1760 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1761 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1762 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1763 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1764 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1766 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1768 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1771 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1772 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1773 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1775 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1777 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1779 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1781 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1782 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1784 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1786 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1787 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1789 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1792 unsigned long offset = (unsigned long)c;
1793 offset += offsetof(struct btrfs_chunk, stripe);
1794 offset += nr * sizeof(struct btrfs_stripe);
1795 return (struct btrfs_stripe *)offset;
1798 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1800 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1803 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1804 struct btrfs_chunk *c, int nr)
1806 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1809 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1810 struct btrfs_chunk *c, int nr)
1812 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1815 /* struct btrfs_block_group_item */
1816 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1818 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1820 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1821 struct btrfs_block_group_item, chunk_objectid, 64);
1823 BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1824 struct btrfs_block_group_item, chunk_objectid, 64);
1825 BTRFS_SETGET_FUNCS(block_group_flags,
1826 struct btrfs_block_group_item, flags, 64);
1827 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1828 struct btrfs_block_group_item, flags, 64);
1830 /* struct btrfs_free_space_info */
1831 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1833 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1835 /* struct btrfs_inode_ref */
1836 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1837 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1839 /* struct btrfs_inode_extref */
1840 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1841 parent_objectid, 64);
1842 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1844 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1846 /* struct btrfs_inode_item */
1847 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1848 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1849 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1850 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1851 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1852 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1853 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1854 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1855 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1856 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1857 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1858 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1859 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1861 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1863 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1865 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1866 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1868 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1870 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1871 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1872 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1873 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1874 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1875 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1876 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1877 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1878 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1879 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1881 /* struct btrfs_dev_extent */
1882 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1884 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1885 chunk_objectid, 64);
1886 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1888 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1889 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1890 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1892 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1894 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1896 static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1897 struct btrfs_tree_block_info *item,
1898 struct btrfs_disk_key *key)
1900 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1903 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1904 struct btrfs_tree_block_info *item,
1905 struct btrfs_disk_key *key)
1907 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1910 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1912 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1914 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1916 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1919 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1922 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1924 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1927 static inline u32 btrfs_extent_inline_ref_size(int type)
1929 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1930 type == BTRFS_SHARED_BLOCK_REF_KEY)
1931 return sizeof(struct btrfs_extent_inline_ref);
1932 if (type == BTRFS_SHARED_DATA_REF_KEY)
1933 return sizeof(struct btrfs_shared_data_ref) +
1934 sizeof(struct btrfs_extent_inline_ref);
1935 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1936 return sizeof(struct btrfs_extent_data_ref) +
1937 offsetof(struct btrfs_extent_inline_ref, offset);
1941 /* struct btrfs_node */
1942 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1943 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1944 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1946 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1949 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1952 ptr = offsetof(struct btrfs_node, ptrs) +
1953 sizeof(struct btrfs_key_ptr) * nr;
1954 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1957 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1961 ptr = offsetof(struct btrfs_node, ptrs) +
1962 sizeof(struct btrfs_key_ptr) * nr;
1963 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1966 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1969 ptr = offsetof(struct btrfs_node, ptrs) +
1970 sizeof(struct btrfs_key_ptr) * nr;
1971 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1974 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1978 ptr = offsetof(struct btrfs_node, ptrs) +
1979 sizeof(struct btrfs_key_ptr) * nr;
1980 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1983 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1985 return offsetof(struct btrfs_node, ptrs) +
1986 sizeof(struct btrfs_key_ptr) * nr;
1989 void btrfs_node_key(const struct extent_buffer *eb,
1990 struct btrfs_disk_key *disk_key, int nr);
1992 static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1993 struct btrfs_disk_key *disk_key, int nr)
1996 ptr = btrfs_node_key_ptr_offset(nr);
1997 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1998 struct btrfs_key_ptr, key, disk_key);
2001 /* struct btrfs_item */
2002 BTRFS_SETGET_FUNCS(raw_item_offset, struct btrfs_item, offset, 32);
2003 BTRFS_SETGET_FUNCS(raw_item_size, struct btrfs_item, size, 32);
2004 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
2005 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
2007 static inline unsigned long btrfs_item_nr_offset(int nr)
2009 return offsetof(struct btrfs_leaf, items) +
2010 sizeof(struct btrfs_item) * nr;
2013 static inline struct btrfs_item *btrfs_item_nr(int nr)
2015 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2018 #define BTRFS_ITEM_SETGET_FUNCS(member) \
2019 static inline u32 btrfs_item_##member(const struct extent_buffer *eb, \
2022 return btrfs_raw_item_##member(eb, btrfs_item_nr(slot)); \
2024 static inline void btrfs_set_item_##member(const struct extent_buffer *eb, \
2025 int slot, u32 val) \
2027 btrfs_set_raw_item_##member(eb, btrfs_item_nr(slot), val); \
2029 static inline u32 btrfs_token_item_##member(struct btrfs_map_token *token, \
2032 struct btrfs_item *item = btrfs_item_nr(slot); \
2033 return btrfs_token_raw_item_##member(token, item); \
2035 static inline void btrfs_set_token_item_##member(struct btrfs_map_token *token, \
2036 int slot, u32 val) \
2038 struct btrfs_item *item = btrfs_item_nr(slot); \
2039 btrfs_set_token_raw_item_##member(token, item, val); \
2042 BTRFS_ITEM_SETGET_FUNCS(offset)
2043 BTRFS_ITEM_SETGET_FUNCS(size);
2045 static inline u32 btrfs_item_data_end(const struct extent_buffer *eb, int nr)
2047 return btrfs_item_offset(eb, nr) + btrfs_item_size(eb, nr);
2050 static inline void btrfs_item_key(const struct extent_buffer *eb,
2051 struct btrfs_disk_key *disk_key, int nr)
2053 struct btrfs_item *item = btrfs_item_nr(nr);
2054 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2057 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2058 struct btrfs_disk_key *disk_key, int nr)
2060 struct btrfs_item *item = btrfs_item_nr(nr);
2061 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2064 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2067 * struct btrfs_root_ref
2069 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2070 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2071 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2073 /* struct btrfs_dir_item */
2074 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2075 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2076 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2077 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2078 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2079 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2081 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2083 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2086 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2087 const struct btrfs_dir_item *item,
2088 struct btrfs_disk_key *key)
2090 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2093 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2094 struct btrfs_dir_item *item,
2095 const struct btrfs_disk_key *key)
2097 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2100 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2102 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2104 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2107 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2108 const struct btrfs_free_space_header *h,
2109 struct btrfs_disk_key *key)
2111 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2114 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2115 struct btrfs_free_space_header *h,
2116 const struct btrfs_disk_key *key)
2118 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2121 /* struct btrfs_disk_key */
2122 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2124 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2125 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2127 #ifdef __LITTLE_ENDIAN
2130 * Optimized helpers for little-endian architectures where CPU and on-disk
2131 * structures have the same endianness and we can skip conversions.
2134 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2135 const struct btrfs_disk_key *disk_key)
2137 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2140 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2141 const struct btrfs_key *cpu_key)
2143 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2146 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2147 struct btrfs_key *cpu_key, int nr)
2149 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2151 btrfs_node_key(eb, disk_key, nr);
2154 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2155 struct btrfs_key *cpu_key, int nr)
2157 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2159 btrfs_item_key(eb, disk_key, nr);
2162 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2163 const struct btrfs_dir_item *item,
2164 struct btrfs_key *cpu_key)
2166 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2168 btrfs_dir_item_key(eb, item, disk_key);
2173 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2174 const struct btrfs_disk_key *disk)
2176 cpu->offset = le64_to_cpu(disk->offset);
2177 cpu->type = disk->type;
2178 cpu->objectid = le64_to_cpu(disk->objectid);
2181 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2182 const struct btrfs_key *cpu)
2184 disk->offset = cpu_to_le64(cpu->offset);
2185 disk->type = cpu->type;
2186 disk->objectid = cpu_to_le64(cpu->objectid);
2189 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2190 struct btrfs_key *key, int nr)
2192 struct btrfs_disk_key disk_key;
2193 btrfs_node_key(eb, &disk_key, nr);
2194 btrfs_disk_key_to_cpu(key, &disk_key);
2197 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2198 struct btrfs_key *key, int nr)
2200 struct btrfs_disk_key disk_key;
2201 btrfs_item_key(eb, &disk_key, nr);
2202 btrfs_disk_key_to_cpu(key, &disk_key);
2205 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2206 const struct btrfs_dir_item *item,
2207 struct btrfs_key *key)
2209 struct btrfs_disk_key disk_key;
2210 btrfs_dir_item_key(eb, item, &disk_key);
2211 btrfs_disk_key_to_cpu(key, &disk_key);
2216 /* struct btrfs_header */
2217 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2218 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2220 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2221 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2222 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2223 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2224 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2226 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2227 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2229 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2231 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2233 return (btrfs_header_flags(eb) & flag) == flag;
2236 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2238 u64 flags = btrfs_header_flags(eb);
2239 btrfs_set_header_flags(eb, flags | flag);
2242 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2244 u64 flags = btrfs_header_flags(eb);
2245 btrfs_set_header_flags(eb, flags & ~flag);
2248 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2250 u64 flags = btrfs_header_flags(eb);
2251 return flags >> BTRFS_BACKREF_REV_SHIFT;
2254 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2257 u64 flags = btrfs_header_flags(eb);
2258 flags &= ~BTRFS_BACKREF_REV_MASK;
2259 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2260 btrfs_set_header_flags(eb, flags);
2263 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2265 return btrfs_header_level(eb) == 0;
2268 /* struct btrfs_root_item */
2269 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2271 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2272 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2273 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2275 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2277 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2278 BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2279 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2280 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2281 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2282 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2283 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2284 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2285 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2287 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2289 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2291 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2293 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2295 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2298 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2300 /* Byte-swap the constant at compile time, root_item::flags is LE */
2301 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2304 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2306 /* Byte-swap the constant at compile time, root_item::flags is LE */
2307 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2310 static inline u64 btrfs_root_id(const struct btrfs_root *root)
2312 return root->root_key.objectid;
2315 /* struct btrfs_root_backup */
2316 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2318 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2320 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2321 tree_root_level, 8);
2323 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2325 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2326 chunk_root_gen, 64);
2327 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2328 chunk_root_level, 8);
2330 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2332 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2333 extent_root_gen, 64);
2334 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2335 extent_root_level, 8);
2337 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2339 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2341 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2344 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2346 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2348 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2351 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2353 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2355 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2356 csum_root_level, 8);
2357 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2359 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2361 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2365 * For extent tree v2 we overload the extent root with the block group root, as
2366 * we will have multiple extent roots.
2368 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root, struct btrfs_root_backup,
2370 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_gen, struct btrfs_root_backup,
2371 extent_root_gen, 64);
2372 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_level,
2373 struct btrfs_root_backup, extent_root_level, 8);
2375 /* struct btrfs_balance_item */
2376 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2378 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2379 const struct btrfs_balance_item *bi,
2380 struct btrfs_disk_balance_args *ba)
2382 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2385 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2386 struct btrfs_balance_item *bi,
2387 const struct btrfs_disk_balance_args *ba)
2389 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2392 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2393 const struct btrfs_balance_item *bi,
2394 struct btrfs_disk_balance_args *ba)
2396 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2399 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2400 struct btrfs_balance_item *bi,
2401 const struct btrfs_disk_balance_args *ba)
2403 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2406 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2407 const struct btrfs_balance_item *bi,
2408 struct btrfs_disk_balance_args *ba)
2410 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2413 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2414 struct btrfs_balance_item *bi,
2415 const struct btrfs_disk_balance_args *ba)
2417 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2421 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2422 const struct btrfs_disk_balance_args *disk)
2424 memset(cpu, 0, sizeof(*cpu));
2426 cpu->profiles = le64_to_cpu(disk->profiles);
2427 cpu->usage = le64_to_cpu(disk->usage);
2428 cpu->devid = le64_to_cpu(disk->devid);
2429 cpu->pstart = le64_to_cpu(disk->pstart);
2430 cpu->pend = le64_to_cpu(disk->pend);
2431 cpu->vstart = le64_to_cpu(disk->vstart);
2432 cpu->vend = le64_to_cpu(disk->vend);
2433 cpu->target = le64_to_cpu(disk->target);
2434 cpu->flags = le64_to_cpu(disk->flags);
2435 cpu->limit = le64_to_cpu(disk->limit);
2436 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2437 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2441 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2442 const struct btrfs_balance_args *cpu)
2444 memset(disk, 0, sizeof(*disk));
2446 disk->profiles = cpu_to_le64(cpu->profiles);
2447 disk->usage = cpu_to_le64(cpu->usage);
2448 disk->devid = cpu_to_le64(cpu->devid);
2449 disk->pstart = cpu_to_le64(cpu->pstart);
2450 disk->pend = cpu_to_le64(cpu->pend);
2451 disk->vstart = cpu_to_le64(cpu->vstart);
2452 disk->vend = cpu_to_le64(cpu->vend);
2453 disk->target = cpu_to_le64(cpu->target);
2454 disk->flags = cpu_to_le64(cpu->flags);
2455 disk->limit = cpu_to_le64(cpu->limit);
2456 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2457 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2460 /* struct btrfs_super_block */
2461 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2462 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2463 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2465 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2466 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2467 struct btrfs_super_block, sys_chunk_array_size, 32);
2468 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2469 struct btrfs_super_block, chunk_root_generation, 64);
2470 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2472 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2474 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2475 chunk_root_level, 8);
2476 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2478 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2479 log_root_transid, 64);
2480 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2482 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2484 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2486 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2488 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2490 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2492 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2493 root_dir_objectid, 64);
2494 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2496 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2498 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2499 compat_ro_flags, 64);
2500 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2501 incompat_flags, 64);
2502 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2504 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2505 cache_generation, 64);
2506 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2507 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2508 uuid_tree_generation, 64);
2509 BTRFS_SETGET_STACK_FUNCS(super_block_group_root, struct btrfs_super_block,
2510 block_group_root, 64);
2511 BTRFS_SETGET_STACK_FUNCS(super_block_group_root_generation,
2512 struct btrfs_super_block,
2513 block_group_root_generation, 64);
2514 BTRFS_SETGET_STACK_FUNCS(super_block_group_root_level, struct btrfs_super_block,
2515 block_group_root_level, 8);
2517 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2518 const char *btrfs_super_csum_name(u16 csum_type);
2519 const char *btrfs_super_csum_driver(u16 csum_type);
2520 size_t __attribute_const__ btrfs_get_num_csums(void);
2524 * The leaf data grows from end-to-front in the node.
2525 * this returns the address of the start of the last item,
2526 * which is the stop of the leaf data stack
2528 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2530 u32 nr = btrfs_header_nritems(leaf);
2533 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2534 return btrfs_item_offset(leaf, nr - 1);
2537 /* struct btrfs_file_extent_item */
2538 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2540 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2541 struct btrfs_file_extent_item, disk_bytenr, 64);
2542 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2543 struct btrfs_file_extent_item, offset, 64);
2544 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2545 struct btrfs_file_extent_item, generation, 64);
2546 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2547 struct btrfs_file_extent_item, num_bytes, 64);
2548 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2549 struct btrfs_file_extent_item, ram_bytes, 64);
2550 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2551 struct btrfs_file_extent_item, disk_num_bytes, 64);
2552 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2553 struct btrfs_file_extent_item, compression, 8);
2555 static inline unsigned long
2556 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2558 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2561 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2563 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2566 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2567 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2569 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2571 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2572 disk_num_bytes, 64);
2573 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2575 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2577 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2579 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2581 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2583 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2584 other_encoding, 16);
2587 * this returns the number of bytes used by the item on disk, minus the
2588 * size of any extent headers. If a file is compressed on disk, this is
2589 * the compressed size
2591 static inline u32 btrfs_file_extent_inline_item_len(
2592 const struct extent_buffer *eb,
2595 return btrfs_item_size(eb, nr) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2598 /* btrfs_qgroup_status_item */
2599 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2601 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2603 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2605 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2608 /* btrfs_qgroup_info_item */
2609 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2611 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2612 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2614 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2615 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2618 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2619 struct btrfs_qgroup_info_item, generation, 64);
2620 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2622 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2623 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2624 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2626 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2627 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2629 /* btrfs_qgroup_limit_item */
2630 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2632 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2634 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2636 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2638 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2641 /* btrfs_dev_replace_item */
2642 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2643 struct btrfs_dev_replace_item, src_devid, 64);
2644 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2645 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2647 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2649 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2651 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2653 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2654 num_write_errors, 64);
2655 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2656 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2658 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2660 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2663 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2664 struct btrfs_dev_replace_item, src_devid, 64);
2665 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2666 struct btrfs_dev_replace_item,
2667 cont_reading_from_srcdev_mode, 64);
2668 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2669 struct btrfs_dev_replace_item, replace_state, 64);
2670 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2671 struct btrfs_dev_replace_item, time_started, 64);
2672 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2673 struct btrfs_dev_replace_item, time_stopped, 64);
2674 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2675 struct btrfs_dev_replace_item, num_write_errors, 64);
2676 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2677 struct btrfs_dev_replace_item,
2678 num_uncorrectable_read_errors, 64);
2679 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2680 struct btrfs_dev_replace_item, cursor_left, 64);
2681 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2682 struct btrfs_dev_replace_item, cursor_right, 64);
2684 /* helper function to cast into the data area of the leaf. */
2685 #define btrfs_item_ptr(leaf, slot, type) \
2686 ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2687 btrfs_item_offset(leaf, slot)))
2689 #define btrfs_item_ptr_offset(leaf, slot) \
2690 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2691 btrfs_item_offset(leaf, slot)))
2693 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2695 return crc32c(crc, address, length);
2698 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2700 put_unaligned_le32(~crc, result);
2703 static inline u64 btrfs_name_hash(const char *name, int len)
2705 return crc32c((u32)~1, name, len);
2709 * Figure the key offset of an extended inode ref
2711 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2714 return (u64) crc32c(parent_objectid, name, len);
2717 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2719 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2724 enum btrfs_inline_ref_type {
2725 BTRFS_REF_TYPE_INVALID,
2726 BTRFS_REF_TYPE_BLOCK,
2727 BTRFS_REF_TYPE_DATA,
2731 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2732 struct btrfs_extent_inline_ref *iref,
2733 enum btrfs_inline_ref_type is_data);
2734 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2736 static inline u8 *btrfs_csum_ptr(const struct btrfs_fs_info *fs_info, u8 *csums,
2739 u64 offset_in_sectors = offset >> fs_info->sectorsize_bits;
2741 return csums + offset_in_sectors * fs_info->csum_size;
2745 * Take the number of bytes to be checksummed and figure out how many leaves
2746 * it would require to store the csums for that many bytes.
2748 static inline u64 btrfs_csum_bytes_to_leaves(
2749 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2751 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2753 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2757 * Use this if we would be adding new items, as we could split nodes as we cow
2760 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2763 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2767 * Doing a truncate or a modification won't result in new nodes or leaves, just
2768 * what we need for COW.
2770 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2773 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2776 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2777 u64 start, u64 num_bytes);
2778 void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2779 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2780 unsigned long count);
2781 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2782 struct btrfs_delayed_ref_root *delayed_refs,
2783 struct btrfs_delayed_ref_head *head);
2784 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2785 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2786 struct btrfs_fs_info *fs_info, u64 bytenr,
2787 u64 offset, int metadata, u64 *refs, u64 *flags);
2788 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2790 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2791 u64 bytenr, u64 num_bytes);
2792 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2793 int btrfs_cross_ref_exist(struct btrfs_root *root,
2794 u64 objectid, u64 offset, u64 bytenr, bool strict,
2795 struct btrfs_path *path);
2796 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2797 struct btrfs_root *root,
2798 u64 parent, u64 root_objectid,
2799 const struct btrfs_disk_key *key,
2800 int level, u64 hint,
2802 enum btrfs_lock_nesting nest);
2803 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2805 struct extent_buffer *buf,
2806 u64 parent, int last_ref);
2807 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2808 struct btrfs_root *root, u64 owner,
2809 u64 offset, u64 ram_bytes,
2810 struct btrfs_key *ins);
2811 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2812 u64 root_objectid, u64 owner, u64 offset,
2813 struct btrfs_key *ins);
2814 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2815 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2816 struct btrfs_key *ins, int is_data, int delalloc);
2817 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2818 struct extent_buffer *buf, int full_backref);
2819 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2820 struct extent_buffer *buf, int full_backref);
2821 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2822 struct extent_buffer *eb, u64 flags, int level);
2823 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2825 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2826 u64 start, u64 len, int delalloc);
2827 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2829 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2830 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2831 struct btrfs_ref *generic_ref);
2833 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2836 * Different levels for to flush space when doing space reservations.
2838 * The higher the level, the more methods we try to reclaim space.
2840 enum btrfs_reserve_flush_enum {
2841 /* If we are in the transaction, we can't flush anything.*/
2842 BTRFS_RESERVE_NO_FLUSH,
2846 * - Running delayed inode items
2847 * - Allocating a new chunk
2849 BTRFS_RESERVE_FLUSH_LIMIT,
2853 * - Running delayed inode items
2854 * - Running delayed refs
2855 * - Running delalloc and waiting for ordered extents
2856 * - Allocating a new chunk
2858 BTRFS_RESERVE_FLUSH_EVICT,
2861 * Flush space by above mentioned methods and by:
2862 * - Running delayed iputs
2863 * - Committing transaction
2865 * Can be interrupted by a fatal signal.
2867 BTRFS_RESERVE_FLUSH_DATA,
2868 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2869 BTRFS_RESERVE_FLUSH_ALL,
2872 * Pretty much the same as FLUSH_ALL, but can also steal space from
2875 * Can be interrupted by a fatal signal.
2877 BTRFS_RESERVE_FLUSH_ALL_STEAL,
2880 enum btrfs_flush_state {
2881 FLUSH_DELAYED_ITEMS_NR = 1,
2882 FLUSH_DELAYED_ITEMS = 2,
2883 FLUSH_DELAYED_REFS_NR = 3,
2884 FLUSH_DELAYED_REFS = 4,
2886 FLUSH_DELALLOC_WAIT = 6,
2887 FLUSH_DELALLOC_FULL = 7,
2889 ALLOC_CHUNK_FORCE = 9,
2890 RUN_DELAYED_IPUTS = 10,
2894 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2895 struct btrfs_block_rsv *rsv,
2896 int nitems, bool use_global_rsv);
2897 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2898 struct btrfs_block_rsv *rsv);
2899 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2901 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes,
2902 u64 disk_num_bytes, bool noflush);
2903 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2904 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2905 u64 start, u64 end);
2906 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2907 u64 num_bytes, u64 *actual_bytes);
2908 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2910 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2911 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2912 struct btrfs_fs_info *fs_info);
2913 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2914 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2915 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2918 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2920 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2921 int btrfs_previous_item(struct btrfs_root *root,
2922 struct btrfs_path *path, u64 min_objectid,
2924 int btrfs_previous_extent_item(struct btrfs_root *root,
2925 struct btrfs_path *path, u64 min_objectid);
2926 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2927 struct btrfs_path *path,
2928 const struct btrfs_key *new_key);
2929 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2930 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2931 struct btrfs_key *key, int lowest_level,
2933 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2934 struct btrfs_path *path,
2936 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2939 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2940 struct btrfs_root *root, struct extent_buffer *buf,
2941 struct extent_buffer *parent, int parent_slot,
2942 struct extent_buffer **cow_ret,
2943 enum btrfs_lock_nesting nest);
2944 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2945 struct btrfs_root *root,
2946 struct extent_buffer *buf,
2947 struct extent_buffer **cow_ret, u64 new_root_objectid);
2948 int btrfs_block_can_be_shared(struct btrfs_root *root,
2949 struct extent_buffer *buf);
2950 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2951 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2952 int btrfs_split_item(struct btrfs_trans_handle *trans,
2953 struct btrfs_root *root,
2954 struct btrfs_path *path,
2955 const struct btrfs_key *new_key,
2956 unsigned long split_offset);
2957 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2958 struct btrfs_root *root,
2959 struct btrfs_path *path,
2960 const struct btrfs_key *new_key);
2961 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2962 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2963 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2964 const struct btrfs_key *key, struct btrfs_path *p,
2965 int ins_len, int cow);
2966 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2967 struct btrfs_path *p, u64 time_seq);
2968 int btrfs_search_slot_for_read(struct btrfs_root *root,
2969 const struct btrfs_key *key,
2970 struct btrfs_path *p, int find_higher,
2972 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2973 struct btrfs_root *root, struct extent_buffer *parent,
2974 int start_slot, u64 *last_ret,
2975 struct btrfs_key *progress);
2976 void btrfs_release_path(struct btrfs_path *p);
2977 struct btrfs_path *btrfs_alloc_path(void);
2978 void btrfs_free_path(struct btrfs_path *p);
2980 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2981 struct btrfs_path *path, int slot, int nr);
2982 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2983 struct btrfs_root *root,
2984 struct btrfs_path *path)
2986 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2990 * Describes a batch of items to insert in a btree. This is used by
2991 * btrfs_insert_empty_items().
2993 struct btrfs_item_batch {
2995 * Pointer to an array containing the keys of the items to insert (in
2998 const struct btrfs_key *keys;
2999 /* Pointer to an array containing the data size for each item to insert. */
3000 const u32 *data_sizes;
3002 * The sum of data sizes for all items. The caller can compute this while
3003 * setting up the data_sizes array, so it ends up being more efficient
3004 * than having btrfs_insert_empty_items() or setup_item_for_insert()
3005 * doing it, as it would avoid an extra loop over a potentially large
3006 * array, and in the case of setup_item_for_insert(), we would be doing
3007 * it while holding a write lock on a leaf and often on upper level nodes
3008 * too, unnecessarily increasing the size of a critical section.
3010 u32 total_data_size;
3011 /* Size of the keys and data_sizes arrays (number of items in the batch). */
3015 void btrfs_setup_item_for_insert(struct btrfs_root *root,
3016 struct btrfs_path *path,
3017 const struct btrfs_key *key,
3019 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3020 const struct btrfs_key *key, void *data, u32 data_size);
3021 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3022 struct btrfs_root *root,
3023 struct btrfs_path *path,
3024 const struct btrfs_item_batch *batch);
3026 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3027 struct btrfs_root *root,
3028 struct btrfs_path *path,
3029 const struct btrfs_key *key,
3032 struct btrfs_item_batch batch;
3035 batch.data_sizes = &data_size;
3036 batch.total_data_size = data_size;
3039 return btrfs_insert_empty_items(trans, root, path, &batch);
3042 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3043 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3046 int btrfs_search_backwards(struct btrfs_root *root, struct btrfs_key *key,
3047 struct btrfs_path *path);
3049 int btrfs_get_next_valid_item(struct btrfs_root *root, struct btrfs_key *key,
3050 struct btrfs_path *path);
3053 * Search in @root for a given @key, and store the slot found in @found_key.
3055 * @root: The root node of the tree.
3056 * @key: The key we are looking for.
3057 * @found_key: Will hold the found item.
3058 * @path: Holds the current slot/leaf.
3059 * @iter_ret: Contains the value returned from btrfs_search_slot or
3060 * btrfs_get_next_valid_item, whichever was executed last.
3062 * The @iter_ret is an output variable that will contain the return value of
3063 * btrfs_search_slot, if it encountered an error, or the value returned from
3064 * btrfs_get_next_valid_item otherwise. That return value can be 0, if a valid
3065 * slot was found, 1 if there were no more leaves, and <0 if there was an error.
3067 * It's recommended to use a separate variable for iter_ret and then use it to
3068 * set the function return value so there's no confusion of the 0/1/errno
3069 * values stemming from btrfs_search_slot.
3071 #define btrfs_for_each_slot(root, key, found_key, path, iter_ret) \
3072 for (iter_ret = btrfs_search_slot(NULL, (root), (key), (path), 0, 0); \
3073 (iter_ret) >= 0 && \
3074 (iter_ret = btrfs_get_next_valid_item((root), (found_key), (path))) == 0; \
3075 (path)->slots[0]++ \
3078 static inline int btrfs_next_old_item(struct btrfs_root *root,
3079 struct btrfs_path *p, u64 time_seq)
3082 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3083 return btrfs_next_old_leaf(root, p, time_seq);
3088 * Search the tree again to find a leaf with greater keys.
3090 * Returns 0 if it found something or 1 if there are no greater leaves.
3091 * Returns < 0 on error.
3093 static inline int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
3095 return btrfs_next_old_leaf(root, path, 0);
3098 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3100 return btrfs_next_old_item(root, p, 0);
3102 int btrfs_leaf_free_space(struct extent_buffer *leaf);
3103 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
3105 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3106 struct btrfs_root *root,
3107 struct extent_buffer *node,
3108 struct extent_buffer *parent);
3109 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3112 * Do it this way so we only ever do one test_bit in the normal case.
3114 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
3115 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
3123 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3124 * anything except sleeping. This function is used to check the status of
3126 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
3127 * since setting and checking for SB_RDONLY in the superblock's flags is not
3130 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
3132 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
3133 btrfs_fs_closing(fs_info);
3136 static inline void btrfs_set_sb_rdonly(struct super_block *sb)
3138 sb->s_flags |= SB_RDONLY;
3139 set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3142 static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
3144 sb->s_flags &= ~SB_RDONLY;
3145 clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3149 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3150 u64 ref_id, u64 dirid, u64 sequence, const char *name,
3152 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3153 u64 ref_id, u64 dirid, u64 *sequence, const char *name,
3155 int btrfs_del_root(struct btrfs_trans_handle *trans,
3156 const struct btrfs_key *key);
3157 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3158 const struct btrfs_key *key,
3159 struct btrfs_root_item *item);
3160 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3161 struct btrfs_root *root,
3162 struct btrfs_key *key,
3163 struct btrfs_root_item *item);
3164 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3165 struct btrfs_path *path, struct btrfs_root_item *root_item,
3166 struct btrfs_key *root_key);
3167 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3168 void btrfs_set_root_node(struct btrfs_root_item *item,
3169 struct extent_buffer *node);
3170 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3171 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3172 struct btrfs_root *root);
3175 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3177 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3179 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3182 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3183 const char *name, int name_len);
3184 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3185 int name_len, struct btrfs_inode *dir,
3186 struct btrfs_key *location, u8 type, u64 index);
3187 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3188 struct btrfs_root *root,
3189 struct btrfs_path *path, u64 dir,
3190 const char *name, int name_len,
3192 struct btrfs_dir_item *
3193 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3194 struct btrfs_root *root,
3195 struct btrfs_path *path, u64 dir,
3196 u64 index, const char *name, int name_len,
3198 struct btrfs_dir_item *
3199 btrfs_search_dir_index_item(struct btrfs_root *root,
3200 struct btrfs_path *path, u64 dirid,
3201 const char *name, int name_len);
3202 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3203 struct btrfs_root *root,
3204 struct btrfs_path *path,
3205 struct btrfs_dir_item *di);
3206 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3207 struct btrfs_root *root,
3208 struct btrfs_path *path, u64 objectid,
3209 const char *name, u16 name_len,
3210 const void *data, u16 data_len);
3211 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3212 struct btrfs_root *root,
3213 struct btrfs_path *path, u64 dir,
3214 const char *name, u16 name_len,
3216 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3217 struct btrfs_path *path,
3222 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3223 struct btrfs_root *root, u64 offset);
3224 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3225 struct btrfs_root *root, u64 offset);
3226 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3229 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3230 struct btrfs_root *root, u64 bytenr, u64 len);
3231 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3232 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3233 struct btrfs_root *root,
3234 u64 objectid, u64 pos,
3235 u64 disk_offset, u64 disk_num_bytes,
3236 u64 num_bytes, u64 offset, u64 ram_bytes,
3237 u8 compression, u8 encryption, u16 other_encoding);
3238 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3239 struct btrfs_root *root,
3240 struct btrfs_path *path, u64 objectid,
3241 u64 bytenr, int mod);
3242 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3243 struct btrfs_root *root,
3244 struct btrfs_ordered_sum *sums);
3245 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3246 u64 offset, bool one_ordered);
3247 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3248 struct list_head *list, int search_commit);
3249 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3250 const struct btrfs_path *path,
3251 struct btrfs_file_extent_item *fi,
3252 const bool new_inline,
3253 struct extent_map *em);
3254 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3256 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3258 void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3259 u64 btrfs_file_extent_end(const struct btrfs_path *path);
3262 void btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3263 int mirror_num, enum btrfs_compression_type compress_type);
3264 int btrfs_check_sector_csum(struct btrfs_fs_info *fs_info, struct page *page,
3265 u32 pgoff, u8 *csum, const u8 * const csum_expected);
3266 unsigned int btrfs_verify_data_csum(struct btrfs_bio *bbio,
3267 u32 bio_offset, struct page *page,
3268 u64 start, u64 end);
3269 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3270 u64 start, u64 len);
3271 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3272 u64 *orig_start, u64 *orig_block_len,
3273 u64 *ram_bytes, bool strict);
3275 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3276 struct btrfs_inode *inode);
3277 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3278 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3279 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3280 struct btrfs_inode *dir, struct btrfs_inode *inode,
3281 const char *name, int name_len);
3282 int btrfs_add_link(struct btrfs_trans_handle *trans,
3283 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3284 const char *name, int name_len, int add_backref, u64 index);
3285 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3286 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3289 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3290 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3291 bool in_reclaim_context);
3292 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3293 unsigned int extra_bits,
3294 struct extent_state **cached_state);
3295 struct btrfs_new_inode_args {
3298 struct dentry *dentry;
3299 struct inode *inode;
3304 * Output from btrfs_new_inode_prepare(), input to
3305 * btrfs_create_new_inode().
3307 struct posix_acl *default_acl;
3308 struct posix_acl *acl;
3310 int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args,
3311 unsigned int *trans_num_items);
3312 int btrfs_create_new_inode(struct btrfs_trans_handle *trans,
3313 struct btrfs_new_inode_args *args);
3314 void btrfs_new_inode_args_destroy(struct btrfs_new_inode_args *args);
3315 struct inode *btrfs_new_subvol_inode(struct user_namespace *mnt_userns,
3317 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3319 void btrfs_clear_delalloc_extent(struct inode *inode,
3320 struct extent_state *state, unsigned *bits);
3321 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3322 struct extent_state *other);
3323 void btrfs_split_delalloc_extent(struct inode *inode,
3324 struct extent_state *orig, u64 split);
3325 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3326 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3327 void btrfs_evict_inode(struct inode *inode);
3328 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3329 struct inode *btrfs_alloc_inode(struct super_block *sb);
3330 void btrfs_destroy_inode(struct inode *inode);
3331 void btrfs_free_inode(struct inode *inode);
3332 int btrfs_drop_inode(struct inode *inode);
3333 int __init btrfs_init_cachep(void);
3334 void __cold btrfs_destroy_cachep(void);
3335 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3336 struct btrfs_root *root, struct btrfs_path *path);
3337 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3338 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3339 struct page *page, size_t pg_offset,
3340 u64 start, u64 end);
3341 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3342 struct btrfs_root *root, struct btrfs_inode *inode);
3343 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3344 struct btrfs_root *root, struct btrfs_inode *inode);
3345 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3346 struct btrfs_inode *inode);
3347 int btrfs_orphan_cleanup(struct btrfs_root *root);
3348 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3349 void btrfs_add_delayed_iput(struct inode *inode);
3350 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3351 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3352 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3353 u64 start, u64 num_bytes, u64 min_size,
3354 loff_t actual_len, u64 *alloc_hint);
3355 int btrfs_prealloc_file_range_trans(struct inode *inode,
3356 struct btrfs_trans_handle *trans, int mode,
3357 u64 start, u64 num_bytes, u64 min_size,
3358 loff_t actual_len, u64 *alloc_hint);
3359 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3360 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3361 struct writeback_control *wbc);
3362 int btrfs_writepage_cow_fixup(struct page *page);
3363 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3364 struct page *page, u64 start,
3365 u64 end, bool uptodate);
3366 ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter,
3367 struct btrfs_ioctl_encoded_io_args *encoded);
3368 ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
3369 const struct btrfs_ioctl_encoded_io_args *encoded);
3371 ssize_t btrfs_dio_rw(struct kiocb *iocb, struct iov_iter *iter, size_t done_before);
3373 extern const struct dentry_operations btrfs_dentry_operations;
3375 /* Inode locking type flags, by default the exclusive lock is taken */
3376 #define BTRFS_ILOCK_SHARED (1U << 0)
3377 #define BTRFS_ILOCK_TRY (1U << 1)
3378 #define BTRFS_ILOCK_MMAP (1U << 2)
3380 int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3381 void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3382 void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3383 const u64 add_bytes,
3384 const u64 del_bytes);
3385 void btrfs_assert_inode_range_clean(struct btrfs_inode *inode, u64 start, u64 end);
3388 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3389 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3390 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3391 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3392 struct dentry *dentry, struct fileattr *fa);
3393 int btrfs_ioctl_get_supported_features(void __user *arg);
3394 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3395 int __pure btrfs_is_empty_uuid(u8 *uuid);
3396 int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
3397 struct btrfs_ioctl_defrag_range_args *range,
3398 u64 newer_than, unsigned long max_to_defrag);
3399 void btrfs_get_block_group_info(struct list_head *groups_list,
3400 struct btrfs_ioctl_space_info *space);
3401 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3402 struct btrfs_ioctl_balance_args *bargs);
3403 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3404 enum btrfs_exclusive_operation type);
3405 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3406 enum btrfs_exclusive_operation type);
3407 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3408 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3409 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
3410 enum btrfs_exclusive_operation op);
3414 int __init btrfs_auto_defrag_init(void);
3415 void __cold btrfs_auto_defrag_exit(void);
3416 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3417 struct btrfs_inode *inode, u32 extent_thresh);
3418 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3419 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3420 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3421 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3423 extern const struct file_operations btrfs_file_operations;
3424 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3425 struct btrfs_root *root, struct btrfs_inode *inode,
3426 struct btrfs_drop_extents_args *args);
3427 int btrfs_replace_file_extents(struct btrfs_inode *inode,
3428 struct btrfs_path *path, const u64 start,
3430 struct btrfs_replace_extent_info *extent_info,
3431 struct btrfs_trans_handle **trans_out);
3432 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3433 struct btrfs_inode *inode, u64 start, u64 end);
3434 ssize_t btrfs_do_write_iter(struct kiocb *iocb, struct iov_iter *from,
3435 const struct btrfs_ioctl_encoded_io_args *encoded);
3436 int btrfs_release_file(struct inode *inode, struct file *file);
3437 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3438 size_t num_pages, loff_t pos, size_t write_bytes,
3439 struct extent_state **cached, bool noreserve);
3440 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3441 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3442 size_t *write_bytes);
3443 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3446 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3447 struct btrfs_root *root);
3450 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3451 unsigned long new_flags);
3452 int btrfs_sync_fs(struct super_block *sb, int wait);
3453 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3454 u64 subvol_objectid);
3456 static inline __printf(2, 3) __cold
3457 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3461 #ifdef CONFIG_PRINTK_INDEX
3463 #define btrfs_printk(fs_info, fmt, args...) \
3465 printk_index_subsys_emit("%sBTRFS %s (device %s): ", NULL, fmt); \
3466 _btrfs_printk(fs_info, fmt, ##args); \
3471 void _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3473 #elif defined(CONFIG_PRINTK)
3475 #define btrfs_printk(fs_info, fmt, args...) \
3476 _btrfs_printk(fs_info, fmt, ##args)
3480 void _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3484 #define btrfs_printk(fs_info, fmt, args...) \
3485 btrfs_no_printk(fs_info, fmt, ##args)
3488 #define btrfs_emerg(fs_info, fmt, args...) \
3489 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3490 #define btrfs_alert(fs_info, fmt, args...) \
3491 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3492 #define btrfs_crit(fs_info, fmt, args...) \
3493 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3494 #define btrfs_err(fs_info, fmt, args...) \
3495 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3496 #define btrfs_warn(fs_info, fmt, args...) \
3497 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3498 #define btrfs_notice(fs_info, fmt, args...) \
3499 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3500 #define btrfs_info(fs_info, fmt, args...) \
3501 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3504 * Wrappers that use printk_in_rcu
3506 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3507 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3508 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3509 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3510 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3511 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3512 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3513 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3514 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3515 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3516 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3517 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3518 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3519 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3522 * Wrappers that use a ratelimited printk_in_rcu
3524 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3525 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3526 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3527 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3528 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3529 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3530 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3531 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3532 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3533 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3534 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3535 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3536 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3537 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3540 * Wrappers that use a ratelimited printk
3542 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3543 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3544 #define btrfs_alert_rl(fs_info, fmt, args...) \
3545 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3546 #define btrfs_crit_rl(fs_info, fmt, args...) \
3547 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3548 #define btrfs_err_rl(fs_info, fmt, args...) \
3549 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3550 #define btrfs_warn_rl(fs_info, fmt, args...) \
3551 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3552 #define btrfs_notice_rl(fs_info, fmt, args...) \
3553 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3554 #define btrfs_info_rl(fs_info, fmt, args...) \
3555 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3557 #if defined(CONFIG_DYNAMIC_DEBUG)
3558 #define btrfs_debug(fs_info, fmt, args...) \
3559 _dynamic_func_call_no_desc(fmt, btrfs_printk, \
3560 fs_info, KERN_DEBUG fmt, ##args)
3561 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3562 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \
3563 fs_info, KERN_DEBUG fmt, ##args)
3564 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3565 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \
3566 fs_info, KERN_DEBUG fmt, ##args)
3567 #define btrfs_debug_rl(fs_info, fmt, args...) \
3568 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \
3569 fs_info, KERN_DEBUG fmt, ##args)
3570 #elif defined(DEBUG)
3571 #define btrfs_debug(fs_info, fmt, args...) \
3572 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3573 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3574 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3575 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3576 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3577 #define btrfs_debug_rl(fs_info, fmt, args...) \
3578 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3580 #define btrfs_debug(fs_info, fmt, args...) \
3581 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3582 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3583 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3584 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3585 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3586 #define btrfs_debug_rl(fs_info, fmt, args...) \
3587 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3590 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3593 btrfs_printk(fs_info, fmt, ##args); \
3594 rcu_read_unlock(); \
3597 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \
3600 btrfs_no_printk(fs_info, fmt, ##args); \
3601 rcu_read_unlock(); \
3604 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3606 static DEFINE_RATELIMIT_STATE(_rs, \
3607 DEFAULT_RATELIMIT_INTERVAL, \
3608 DEFAULT_RATELIMIT_BURST); \
3609 if (__ratelimit(&_rs)) \
3610 btrfs_printk(fs_info, fmt, ##args); \
3613 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3616 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3617 rcu_read_unlock(); \
3620 #ifdef CONFIG_BTRFS_ASSERT
3622 static inline void assertfail(const char *expr, const char *file, int line)
3624 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3628 #define ASSERT(expr) \
3629 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3632 static inline void assertfail(const char *expr, const char* file, int line) { }
3633 #define ASSERT(expr) (void)(expr)
3636 #if BITS_PER_LONG == 32
3637 #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3639 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3640 * addresses of extents.
3642 * For 4K page size it's about 10T, for 64K it's 160T.
3644 #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3645 void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3646 void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3650 * Get the correct offset inside the page of extent buffer.
3652 * @eb: target extent buffer
3653 * @start: offset inside the extent buffer
3655 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3657 static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3658 unsigned long offset)
3661 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3662 * to PAGE_SIZE, thus adding it won't cause any difference.
3664 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3665 * to the eb, thus we have to take the eb->start into consideration.
3667 return offset_in_page(offset + eb->start);
3670 static inline unsigned long get_eb_page_index(unsigned long offset)
3673 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3675 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3676 * and have ensured that all tree blocks are contained in one page,
3677 * thus we always get index == 0.
3679 return offset >> PAGE_SHIFT;
3683 * Use that for functions that are conditionally exported for sanity tests but
3686 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3687 #define EXPORT_FOR_TESTS static
3689 #define EXPORT_FOR_TESTS
3693 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3696 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3701 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3702 unsigned int line, int errno, const char *fmt, ...);
3704 const char * __attribute_const__ btrfs_decode_error(int errno);
3707 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3708 const char *function,
3709 unsigned int line, int errno);
3712 * Call btrfs_abort_transaction as early as possible when an error condition is
3713 * detected, that way the exact line number is reported.
3715 #define btrfs_abort_transaction(trans, errno) \
3717 /* Report first abort since mount */ \
3718 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3719 &((trans)->fs_info->fs_state))) { \
3720 if ((errno) != -EIO && (errno) != -EROFS) { \
3721 WARN(1, KERN_DEBUG \
3722 "BTRFS: Transaction aborted (error %d)\n", \
3725 btrfs_debug((trans)->fs_info, \
3726 "Transaction aborted (error %d)", \
3730 __btrfs_abort_transaction((trans), __func__, \
3731 __LINE__, (errno)); \
3734 #ifdef CONFIG_PRINTK_INDEX
3736 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3738 printk_index_subsys_emit( \
3739 "BTRFS: error (device %s%s) in %s:%d: errno=%d %s", \
3741 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3742 (errno), fmt, ##args); \
3747 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3748 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3749 (errno), fmt, ##args)
3753 #define BTRFS_FS_ERROR(fs_info) (unlikely(test_bit(BTRFS_FS_STATE_ERROR, \
3754 &(fs_info)->fs_state)))
3755 #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \
3756 (unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \
3757 &(fs_info)->fs_state)))
3761 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3762 unsigned int line, int errno, const char *fmt, ...);
3764 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3765 * will panic(). Otherwise we BUG() here.
3767 #define btrfs_panic(fs_info, errno, fmt, args...) \
3769 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3774 /* compatibility and incompatibility defines */
3776 #define btrfs_set_fs_incompat(__fs_info, opt) \
3777 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3780 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3781 u64 flag, const char* name)
3783 struct btrfs_super_block *disk_super;
3786 disk_super = fs_info->super_copy;
3787 features = btrfs_super_incompat_flags(disk_super);
3788 if (!(features & flag)) {
3789 spin_lock(&fs_info->super_lock);
3790 features = btrfs_super_incompat_flags(disk_super);
3791 if (!(features & flag)) {
3793 btrfs_set_super_incompat_flags(disk_super, features);
3795 "setting incompat feature flag for %s (0x%llx)",
3798 spin_unlock(&fs_info->super_lock);
3802 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3803 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3806 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3807 u64 flag, const char* name)
3809 struct btrfs_super_block *disk_super;
3812 disk_super = fs_info->super_copy;
3813 features = btrfs_super_incompat_flags(disk_super);
3814 if (features & flag) {
3815 spin_lock(&fs_info->super_lock);
3816 features = btrfs_super_incompat_flags(disk_super);
3817 if (features & flag) {
3819 btrfs_set_super_incompat_flags(disk_super, features);
3821 "clearing incompat feature flag for %s (0x%llx)",
3824 spin_unlock(&fs_info->super_lock);
3828 #define btrfs_fs_incompat(fs_info, opt) \
3829 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3831 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3833 struct btrfs_super_block *disk_super;
3834 disk_super = fs_info->super_copy;
3835 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3838 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3839 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3842 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3843 u64 flag, const char *name)
3845 struct btrfs_super_block *disk_super;
3848 disk_super = fs_info->super_copy;
3849 features = btrfs_super_compat_ro_flags(disk_super);
3850 if (!(features & flag)) {
3851 spin_lock(&fs_info->super_lock);
3852 features = btrfs_super_compat_ro_flags(disk_super);
3853 if (!(features & flag)) {
3855 btrfs_set_super_compat_ro_flags(disk_super, features);
3857 "setting compat-ro feature flag for %s (0x%llx)",
3860 spin_unlock(&fs_info->super_lock);
3864 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3865 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3868 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3869 u64 flag, const char *name)
3871 struct btrfs_super_block *disk_super;
3874 disk_super = fs_info->super_copy;
3875 features = btrfs_super_compat_ro_flags(disk_super);
3876 if (features & flag) {
3877 spin_lock(&fs_info->super_lock);
3878 features = btrfs_super_compat_ro_flags(disk_super);
3879 if (features & flag) {
3881 btrfs_set_super_compat_ro_flags(disk_super, features);
3883 "clearing compat-ro feature flag for %s (0x%llx)",
3886 spin_unlock(&fs_info->super_lock);
3890 #define btrfs_fs_compat_ro(fs_info, opt) \
3891 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3893 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3895 struct btrfs_super_block *disk_super;
3896 disk_super = fs_info->super_copy;
3897 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3901 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3902 struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu);
3903 int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3904 struct posix_acl *acl, int type);
3905 int __btrfs_set_acl(struct btrfs_trans_handle *trans, struct inode *inode,
3906 struct posix_acl *acl, int type);
3908 #define btrfs_get_acl NULL
3909 #define btrfs_set_acl NULL
3910 static inline int __btrfs_set_acl(struct btrfs_trans_handle *trans,
3911 struct inode *inode, struct posix_acl *acl,
3919 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3920 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3921 struct btrfs_root *root);
3922 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3923 struct btrfs_root *root);
3924 int btrfs_recover_relocation(struct btrfs_fs_info *fs_info);
3925 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3926 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3927 struct btrfs_root *root, struct extent_buffer *buf,
3928 struct extent_buffer *cow);
3929 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3930 u64 *bytes_to_reserve);
3931 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3932 struct btrfs_pending_snapshot *pending);
3933 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3934 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3936 int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3939 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3940 u64 end, struct btrfs_scrub_progress *progress,
3941 int readonly, int is_dev_replace);
3942 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3943 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3944 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3945 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3946 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3947 struct btrfs_scrub_progress *progress);
3948 static inline void btrfs_init_full_stripe_locks_tree(
3949 struct btrfs_full_stripe_locks_tree *locks_root)
3951 locks_root->root = RB_ROOT;
3952 mutex_init(&locks_root->lock);
3956 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3957 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3958 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3960 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3962 btrfs_bio_counter_sub(fs_info, 1);
3965 static inline int is_fstree(u64 rootid)
3967 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3968 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3969 !btrfs_qgroup_level(rootid)))
3974 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3976 return signal_pending(current);
3980 #ifdef CONFIG_FS_VERITY
3982 extern const struct fsverity_operations btrfs_verityops;
3983 int btrfs_drop_verity_items(struct btrfs_inode *inode);
3985 BTRFS_SETGET_FUNCS(verity_descriptor_encryption, struct btrfs_verity_descriptor_item,
3987 BTRFS_SETGET_FUNCS(verity_descriptor_size, struct btrfs_verity_descriptor_item,
3989 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_encryption,
3990 struct btrfs_verity_descriptor_item, encryption, 8);
3991 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_size,
3992 struct btrfs_verity_descriptor_item, size, 64);
3996 static inline int btrfs_drop_verity_items(struct btrfs_inode *inode)
4003 /* Sanity test specific functions */
4004 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4005 void btrfs_test_destroy_inode(struct inode *inode);
4006 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
4008 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
4011 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
4017 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
4019 return fs_info->zone_size > 0;
4022 static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root)
4024 return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;
4028 * We use page status Private2 to indicate there is an ordered extent with
4031 * Rename the Private2 accessors to Ordered, to improve readability.
4033 #define PageOrdered(page) PagePrivate2(page)
4034 #define SetPageOrdered(page) SetPagePrivate2(page)
4035 #define ClearPageOrdered(page) ClearPagePrivate2(page)
4036 #define folio_test_ordered(folio) folio_test_private_2(folio)
4037 #define folio_set_ordered(folio) folio_set_private_2(folio)
4038 #define folio_clear_ordered(folio) folio_clear_private_2(folio)