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;
53 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
56 * Maximum number of mirrors that can be available for all profiles counting
57 * the target device of dev-replace as one. During an active device replace
58 * procedure, the target device of the copy operation is a mirror for the
59 * filesystem data as well that can be used to read data in order to repair
60 * read errors on other disks.
62 * Current value is derived from RAID1C4 with 4 copies.
64 #define BTRFS_MAX_MIRRORS (4 + 1)
66 #define BTRFS_MAX_LEVEL 8
68 #define BTRFS_OLDEST_GENERATION 0ULL
71 * we can actually store much bigger names, but lets not confuse the rest
74 #define BTRFS_NAME_LEN 255
77 * Theoretical limit is larger, but we keep this down to a sane
78 * value. That should limit greatly the possibility of collisions on
81 #define BTRFS_LINK_MAX 65535U
83 #define BTRFS_EMPTY_DIR_SIZE 0
85 /* ioprio of readahead is set to idle */
86 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
88 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M
91 * Use large batch size to reduce overhead of metadata updates. On the reader
92 * side, we only read it when we are close to ENOSPC and the read overhead is
93 * mostly related to the number of CPUs, so it is OK to use arbitrary large
96 #define BTRFS_TOTAL_BYTES_PINNED_BATCH SZ_128M
98 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
101 * Deltas are an effective way to populate global statistics. Give macro names
102 * to make it clear what we're doing. An example is discard_extents in
103 * btrfs_free_space_ctl.
105 #define BTRFS_STAT_NR_ENTRIES 2
106 #define BTRFS_STAT_CURR 0
107 #define BTRFS_STAT_PREV 1
110 * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
112 static inline u32 count_max_extents(u64 size)
114 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
117 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
119 BUG_ON(num_stripes == 0);
120 return sizeof(struct btrfs_chunk) +
121 sizeof(struct btrfs_stripe) * (num_stripes - 1);
125 * Runtime (in-memory) states of filesystem
128 /* Global indicator of serious filesystem errors */
129 BTRFS_FS_STATE_ERROR,
131 * Filesystem is being remounted, allow to skip some operations, like
134 BTRFS_FS_STATE_REMOUNTING,
135 /* Filesystem in RO mode */
137 /* Track if a transaction abort has been reported on this filesystem */
138 BTRFS_FS_STATE_TRANS_ABORTED,
140 * Bio operations should be blocked on this filesystem because a source
141 * or target device is being destroyed as part of a device replace
143 BTRFS_FS_STATE_DEV_REPLACING,
144 /* The btrfs_fs_info created for self-tests */
145 BTRFS_FS_STATE_DUMMY_FS_INFO,
147 BTRFS_FS_STATE_NO_CSUMS,
150 #define BTRFS_BACKREF_REV_MAX 256
151 #define BTRFS_BACKREF_REV_SHIFT 56
152 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
153 BTRFS_BACKREF_REV_SHIFT)
155 #define BTRFS_OLD_BACKREF_REV 0
156 #define BTRFS_MIXED_BACKREF_REV 1
159 * every tree block (leaf or node) starts with this header.
161 struct btrfs_header {
162 /* these first four must match the super block */
163 u8 csum[BTRFS_CSUM_SIZE];
164 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
165 __le64 bytenr; /* which block this node is supposed to live in */
168 /* allowed to be different from the super from here on down */
169 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
174 } __attribute__ ((__packed__));
177 * this is a very generous portion of the super block, giving us
178 * room to translate 14 chunks with 3 stripes each.
180 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
183 * just in case we somehow lose the roots and are not able to mount,
184 * we store an array of the roots from previous transactions
187 #define BTRFS_NUM_BACKUP_ROOTS 4
188 struct btrfs_root_backup {
190 __le64 tree_root_gen;
193 __le64 chunk_root_gen;
196 __le64 extent_root_gen;
205 __le64 csum_root_gen;
215 u8 extent_root_level;
219 /* future and to align */
221 } __attribute__ ((__packed__));
223 #define BTRFS_SUPER_INFO_OFFSET SZ_64K
224 #define BTRFS_SUPER_INFO_SIZE 4096
227 * the super block basically lists the main trees of the FS
228 * it currently lacks any block count etc etc
230 struct btrfs_super_block {
231 /* the first 4 fields must match struct btrfs_header */
232 u8 csum[BTRFS_CSUM_SIZE];
233 /* FS specific UUID, visible to user */
234 u8 fsid[BTRFS_FSID_SIZE];
235 __le64 bytenr; /* this block number */
238 /* allowed to be different from the btrfs_header from here own down */
245 /* this will help find the new super based on the log root */
246 __le64 log_root_transid;
249 __le64 root_dir_objectid;
253 __le32 __unused_leafsize;
255 __le32 sys_chunk_array_size;
256 __le64 chunk_root_generation;
258 __le64 compat_ro_flags;
259 __le64 incompat_flags;
264 struct btrfs_dev_item dev_item;
266 char label[BTRFS_LABEL_SIZE];
268 __le64 cache_generation;
269 __le64 uuid_tree_generation;
271 /* the UUID written into btree blocks */
272 u8 metadata_uuid[BTRFS_FSID_SIZE];
274 /* future expansion */
276 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
277 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
279 /* Padded to 4096 bytes */
281 } __attribute__ ((__packed__));
282 static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE);
285 * Compat flags that we support. If any incompat flags are set other than the
286 * ones specified below then we will fail to mount
288 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
289 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
290 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
292 #define BTRFS_FEATURE_COMPAT_RO_SUPP \
293 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
294 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
295 BTRFS_FEATURE_COMPAT_RO_VERITY)
297 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
298 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
300 #define BTRFS_FEATURE_INCOMPAT_SUPP \
301 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
302 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
303 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
304 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
305 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
306 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
307 BTRFS_FEATURE_INCOMPAT_RAID56 | \
308 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
309 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
310 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
311 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
312 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
313 BTRFS_FEATURE_INCOMPAT_ZONED)
315 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
316 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
317 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
320 * A leaf is full of items. offset and size tell us where to find
321 * the item in the leaf (relative to the start of the data area)
324 struct btrfs_disk_key key;
327 } __attribute__ ((__packed__));
330 * leaves have an item area and a data area:
331 * [item0, item1....itemN] [free space] [dataN...data1, data0]
333 * The data is separate from the items to get the keys closer together
337 struct btrfs_header header;
338 struct btrfs_item items[];
339 } __attribute__ ((__packed__));
342 * all non-leaf blocks are nodes, they hold only keys and pointers to
345 struct btrfs_key_ptr {
346 struct btrfs_disk_key key;
349 } __attribute__ ((__packed__));
352 struct btrfs_header header;
353 struct btrfs_key_ptr ptrs[];
354 } __attribute__ ((__packed__));
356 /* Read ahead values for struct btrfs_path.reada */
362 * Similar to READA_FORWARD but unlike it:
364 * 1) It will trigger readahead even for leaves that are not close to
365 * each other on disk;
366 * 2) It also triggers readahead for nodes;
367 * 3) During a search, even when a node or leaf is already in memory, it
368 * will still trigger readahead for other nodes and leaves that follow
371 * This is meant to be used only when we know we are iterating over the
372 * entire tree or a very large part of it.
374 READA_FORWARD_ALWAYS,
378 * btrfs_paths remember the path taken from the root down to the leaf.
379 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
380 * to any other levels that are present.
382 * The slots array records the index of the item or block pointer
383 * used while walking the tree.
386 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
387 int slots[BTRFS_MAX_LEVEL];
388 /* if there is real range locking, this locks field will change */
389 u8 locks[BTRFS_MAX_LEVEL];
391 /* keep some upper locks as we walk down */
395 * set by btrfs_split_item, tells search_slot to keep all locks
396 * and to force calls to keep space in the nodes
398 unsigned int search_for_split:1;
399 unsigned int keep_locks:1;
400 unsigned int skip_locking:1;
401 unsigned int search_commit_root:1;
402 unsigned int need_commit_sem:1;
403 unsigned int skip_release_on_error:1;
405 * Indicate that new item (btrfs_search_slot) is extending already
406 * existing item and ins_len contains only the data size and not item
407 * header (ie. sizeof(struct btrfs_item) is not included).
409 unsigned int search_for_extension:1;
411 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
412 sizeof(struct btrfs_item))
413 struct btrfs_dev_replace {
414 u64 replace_state; /* see #define above */
415 time64_t time_started; /* seconds since 1-Jan-1970 */
416 time64_t time_stopped; /* seconds since 1-Jan-1970 */
417 atomic64_t num_write_errors;
418 atomic64_t num_uncorrectable_read_errors;
421 u64 committed_cursor_left;
422 u64 cursor_left_last_write_of_item;
425 u64 cont_reading_from_srcdev_mode; /* see #define above */
428 int item_needs_writeback;
429 struct btrfs_device *srcdev;
430 struct btrfs_device *tgtdev;
432 struct mutex lock_finishing_cancel_unmount;
433 struct rw_semaphore rwsem;
435 struct btrfs_scrub_progress scrub_progress;
437 struct percpu_counter bio_counter;
438 wait_queue_head_t replace_wait;
442 * free clusters are used to claim free space in relatively large chunks,
443 * allowing us to do less seeky writes. They are used for all metadata
444 * allocations. In ssd_spread mode they are also used for data allocations.
446 struct btrfs_free_cluster {
448 spinlock_t refill_lock;
451 /* largest extent in this cluster */
454 /* first extent starting offset */
457 /* We did a full search and couldn't create a cluster */
460 struct btrfs_block_group *block_group;
462 * when a cluster is allocated from a block group, we put the
463 * cluster onto a list in the block group so that it can
464 * be freed before the block group is freed.
466 struct list_head block_group_list;
469 enum btrfs_caching_type {
473 BTRFS_CACHE_FINISHED,
478 * Tree to record all locked full stripes of a RAID5/6 block group
480 struct btrfs_full_stripe_locks_tree {
485 /* Discard control. */
487 * Async discard uses multiple lists to differentiate the discard filter
488 * parameters. Index 0 is for completely free block groups where we need to
489 * ensure the entire block group is trimmed without being lossy. Indices
490 * afterwards represent monotonically decreasing discard filter sizes to
491 * prioritize what should be discarded next.
493 #define BTRFS_NR_DISCARD_LISTS 3
494 #define BTRFS_DISCARD_INDEX_UNUSED 0
495 #define BTRFS_DISCARD_INDEX_START 1
497 struct btrfs_discard_ctl {
498 struct workqueue_struct *discard_workers;
499 struct delayed_work work;
501 struct btrfs_block_group *block_group;
502 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
504 u64 prev_discard_time;
505 atomic_t discardable_extents;
506 atomic64_t discardable_bytes;
507 u64 max_discard_size;
511 u64 discard_extent_bytes;
512 u64 discard_bitmap_bytes;
513 atomic64_t discard_bytes_saved;
516 void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
519 struct reloc_control;
521 struct btrfs_fs_devices;
522 struct btrfs_balance_control;
523 struct btrfs_delayed_root;
526 * Block group or device which contains an active swapfile. Used for preventing
527 * unsafe operations while a swapfile is active.
529 * These are sorted on (ptr, inode) (note that a block group or device can
530 * contain more than one swapfile). We compare the pointer values because we
531 * don't actually care what the object is, we just need a quick check whether
532 * the object exists in the rbtree.
534 struct btrfs_swapfile_pin {
539 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
540 * points to a struct btrfs_device.
544 * Only used when 'is_block_group' is true and it is the number of
545 * extents used by a swapfile for this block group ('ptr' field).
550 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
553 BTRFS_FS_CLOSING_START,
554 BTRFS_FS_CLOSING_DONE,
555 BTRFS_FS_LOG_RECOVERING,
557 BTRFS_FS_QUOTA_ENABLED,
558 BTRFS_FS_UPDATE_UUID_TREE_GEN,
559 BTRFS_FS_CREATING_FREE_SPACE_TREE,
563 BTRFS_FS_QUOTA_OVERRIDE,
564 /* Used to record internally whether fs has been frozen */
567 * Indicate that balance has been set up from the ioctl and is in the
568 * main phase. The fs_info::balance_ctl is initialized.
570 BTRFS_FS_BALANCE_RUNNING,
573 * Indicate that relocation of a chunk has started, it's set per chunk
574 * and is toggled between chunks.
576 BTRFS_FS_RELOC_RUNNING,
578 /* Indicate that the cleaner thread is awake and doing something. */
579 BTRFS_FS_CLEANER_RUNNING,
582 * The checksumming has an optimized version and is considered fast,
583 * so we don't need to offload checksums to workqueues.
585 BTRFS_FS_CSUM_IMPL_FAST,
587 /* Indicate that the discard workqueue can service discards. */
588 BTRFS_FS_DISCARD_RUNNING,
590 /* Indicate that we need to cleanup space cache v1 */
591 BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
593 /* Indicate that we can't trust the free space tree for caching yet */
594 BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
596 /* Indicate whether there are any tree modification log users */
597 BTRFS_FS_TREE_MOD_LOG_USERS,
599 /* Indicate that we want the transaction kthread to commit right now. */
600 BTRFS_FS_COMMIT_TRANS,
602 #if BITS_PER_LONG == 32
603 /* Indicate if we have error/warn message printed on 32bit systems */
604 BTRFS_FS_32BIT_ERROR,
610 * Exclusive operations (device replace, resize, device add/remove, balance)
612 enum btrfs_exclusive_operation {
614 BTRFS_EXCLOP_BALANCE_PAUSED,
615 BTRFS_EXCLOP_BALANCE,
616 BTRFS_EXCLOP_DEV_ADD,
617 BTRFS_EXCLOP_DEV_REMOVE,
618 BTRFS_EXCLOP_DEV_REPLACE,
620 BTRFS_EXCLOP_SWAP_ACTIVATE,
623 struct btrfs_fs_info {
624 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
626 struct btrfs_root *tree_root;
627 struct btrfs_root *chunk_root;
628 struct btrfs_root *dev_root;
629 struct btrfs_root *fs_root;
630 struct btrfs_root *quota_root;
631 struct btrfs_root *uuid_root;
632 struct btrfs_root *data_reloc_root;
634 /* the log root tree is a directory of all the other log roots */
635 struct btrfs_root *log_root_tree;
637 /* The tree that holds the global roots (csum, extent, etc) */
638 rwlock_t global_root_lock;
639 struct rb_root global_root_tree;
641 spinlock_t fs_roots_radix_lock;
642 struct radix_tree_root fs_roots_radix;
644 /* block group cache stuff */
645 spinlock_t block_group_cache_lock;
646 u64 first_logical_byte;
647 struct rb_root block_group_cache_tree;
649 /* keep track of unallocated space */
650 atomic64_t free_chunk_space;
652 /* Track ranges which are used by log trees blocks/logged data extents */
653 struct extent_io_tree excluded_extents;
655 /* logical->physical extent mapping */
656 struct extent_map_tree mapping_tree;
659 * block reservation for extent, checksum, root tree and
660 * delayed dir index item
662 struct btrfs_block_rsv global_block_rsv;
663 /* block reservation for metadata operations */
664 struct btrfs_block_rsv trans_block_rsv;
665 /* block reservation for chunk tree */
666 struct btrfs_block_rsv chunk_block_rsv;
667 /* block reservation for delayed operations */
668 struct btrfs_block_rsv delayed_block_rsv;
669 /* block reservation for delayed refs */
670 struct btrfs_block_rsv delayed_refs_rsv;
672 struct btrfs_block_rsv empty_block_rsv;
675 u64 last_trans_committed;
677 * Generation of the last transaction used for block group relocation
678 * since the filesystem was last mounted (or 0 if none happened yet).
679 * Must be written and read while holding btrfs_fs_info::commit_root_sem.
681 u64 last_reloc_trans;
682 u64 avg_delayed_ref_runtime;
685 * this is updated to the current trans every time a full commit
686 * is required instead of the faster short fsync log commits
688 u64 last_trans_log_full_commit;
689 unsigned long mount_opt;
691 * Track requests for actions that need to be done during transaction
692 * commit (like for some mount options).
694 unsigned long pending_changes;
695 unsigned long compress_type:4;
696 unsigned int compress_level;
699 * It is a suggestive number, the read side is safe even it gets a
700 * wrong number because we will write out the data into a regular
701 * extent. The write side(mount/remount) is under ->s_umount lock,
702 * so it is also safe.
706 struct btrfs_transaction *running_transaction;
707 wait_queue_head_t transaction_throttle;
708 wait_queue_head_t transaction_wait;
709 wait_queue_head_t transaction_blocked_wait;
710 wait_queue_head_t async_submit_wait;
713 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
714 * when they are updated.
716 * Because we do not clear the flags for ever, so we needn't use
717 * the lock on the read side.
719 * We also needn't use the lock when we mount the fs, because
720 * there is no other task which will update the flag.
722 spinlock_t super_lock;
723 struct btrfs_super_block *super_copy;
724 struct btrfs_super_block *super_for_commit;
725 struct super_block *sb;
726 struct inode *btree_inode;
727 struct mutex tree_log_mutex;
728 struct mutex transaction_kthread_mutex;
729 struct mutex cleaner_mutex;
730 struct mutex chunk_mutex;
733 * this is taken to make sure we don't set block groups ro after
734 * the free space cache has been allocated on them
736 struct mutex ro_block_group_mutex;
738 /* this is used during read/modify/write to make sure
739 * no two ios are trying to mod the same stripe at the same
742 struct btrfs_stripe_hash_table *stripe_hash_table;
745 * this protects the ordered operations list only while we are
746 * processing all of the entries on it. This way we make
747 * sure the commit code doesn't find the list temporarily empty
748 * because another function happens to be doing non-waiting preflush
749 * before jumping into the main commit.
751 struct mutex ordered_operations_mutex;
753 struct rw_semaphore commit_root_sem;
755 struct rw_semaphore cleanup_work_sem;
757 struct rw_semaphore subvol_sem;
759 spinlock_t trans_lock;
761 * the reloc mutex goes with the trans lock, it is taken
762 * during commit to protect us from the relocation code
764 struct mutex reloc_mutex;
766 struct list_head trans_list;
767 struct list_head dead_roots;
768 struct list_head caching_block_groups;
770 spinlock_t delayed_iput_lock;
771 struct list_head delayed_iputs;
772 atomic_t nr_delayed_iputs;
773 wait_queue_head_t delayed_iputs_wait;
775 atomic64_t tree_mod_seq;
777 /* this protects tree_mod_log and tree_mod_seq_list */
778 rwlock_t tree_mod_log_lock;
779 struct rb_root tree_mod_log;
780 struct list_head tree_mod_seq_list;
782 atomic_t async_delalloc_pages;
785 * this is used to protect the following list -- ordered_roots.
787 spinlock_t ordered_root_lock;
790 * all fs/file tree roots in which there are data=ordered extents
791 * pending writeback are added into this list.
793 * these can span multiple transactions and basically include
794 * every dirty data page that isn't from nodatacow
796 struct list_head ordered_roots;
798 struct mutex delalloc_root_mutex;
799 spinlock_t delalloc_root_lock;
800 /* all fs/file tree roots that have delalloc inodes. */
801 struct list_head delalloc_roots;
804 * there is a pool of worker threads for checksumming during writes
805 * and a pool for checksumming after reads. This is because readers
806 * can run with FS locks held, and the writers may be waiting for
807 * those locks. We don't want ordering in the pending list to cause
808 * deadlocks, and so the two are serviced separately.
810 * A third pool does submit_bio to avoid deadlocking with the other
813 struct btrfs_workqueue *workers;
814 struct btrfs_workqueue *delalloc_workers;
815 struct btrfs_workqueue *flush_workers;
816 struct btrfs_workqueue *endio_workers;
817 struct btrfs_workqueue *endio_meta_workers;
818 struct btrfs_workqueue *endio_raid56_workers;
819 struct btrfs_workqueue *rmw_workers;
820 struct btrfs_workqueue *endio_meta_write_workers;
821 struct btrfs_workqueue *endio_write_workers;
822 struct btrfs_workqueue *endio_freespace_worker;
823 struct btrfs_workqueue *caching_workers;
826 * fixup workers take dirty pages that didn't properly go through
827 * the cow mechanism and make them safe to write. It happens
828 * for the sys_munmap function call path
830 struct btrfs_workqueue *fixup_workers;
831 struct btrfs_workqueue *delayed_workers;
833 struct task_struct *transaction_kthread;
834 struct task_struct *cleaner_kthread;
835 u32 thread_pool_size;
837 struct kobject *space_info_kobj;
838 struct kobject *qgroups_kobj;
840 /* used to keep from writing metadata until there is a nice batch */
841 struct percpu_counter dirty_metadata_bytes;
842 struct percpu_counter delalloc_bytes;
843 struct percpu_counter ordered_bytes;
844 s32 dirty_metadata_batch;
847 struct list_head dirty_cowonly_roots;
849 struct btrfs_fs_devices *fs_devices;
852 * The space_info list is effectively read only after initial
853 * setup. It is populated at mount time and cleaned up after
854 * all block groups are removed. RCU is used to protect it.
856 struct list_head space_info;
858 struct btrfs_space_info *data_sinfo;
860 struct reloc_control *reloc_ctl;
862 /* data_alloc_cluster is only used in ssd_spread mode */
863 struct btrfs_free_cluster data_alloc_cluster;
865 /* all metadata allocations go through this cluster */
866 struct btrfs_free_cluster meta_alloc_cluster;
868 /* auto defrag inodes go here */
869 spinlock_t defrag_inodes_lock;
870 struct rb_root defrag_inodes;
871 atomic_t defrag_running;
873 /* Used to protect avail_{data, metadata, system}_alloc_bits */
874 seqlock_t profiles_lock;
876 * these three are in extended format (availability of single
877 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
878 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
880 u64 avail_data_alloc_bits;
881 u64 avail_metadata_alloc_bits;
882 u64 avail_system_alloc_bits;
884 /* restriper state */
885 spinlock_t balance_lock;
886 struct mutex balance_mutex;
887 atomic_t balance_pause_req;
888 atomic_t balance_cancel_req;
889 struct btrfs_balance_control *balance_ctl;
890 wait_queue_head_t balance_wait_q;
892 /* Cancellation requests for chunk relocation */
893 atomic_t reloc_cancel_req;
895 u32 data_chunk_allocations;
900 /* private scrub information */
901 struct mutex scrub_lock;
902 atomic_t scrubs_running;
903 atomic_t scrub_pause_req;
904 atomic_t scrubs_paused;
905 atomic_t scrub_cancel_req;
906 wait_queue_head_t scrub_pause_wait;
908 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
911 refcount_t scrub_workers_refcnt;
912 struct btrfs_workqueue *scrub_workers;
913 struct btrfs_workqueue *scrub_wr_completion_workers;
914 struct btrfs_workqueue *scrub_parity_workers;
915 struct btrfs_subpage_info *subpage_info;
917 struct btrfs_discard_ctl discard_ctl;
919 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
920 u32 check_integrity_print_mask;
922 /* is qgroup tracking in a consistent state? */
925 /* holds configuration and tracking. Protected by qgroup_lock */
926 struct rb_root qgroup_tree;
927 spinlock_t qgroup_lock;
930 * used to avoid frequently calling ulist_alloc()/ulist_free()
931 * when doing qgroup accounting, it must be protected by qgroup_lock.
933 struct ulist *qgroup_ulist;
936 * Protect user change for quota operations. If a transaction is needed,
937 * it must be started before locking this lock.
939 struct mutex qgroup_ioctl_lock;
941 /* list of dirty qgroups to be written at next commit */
942 struct list_head dirty_qgroups;
944 /* used by qgroup for an efficient tree traversal */
947 /* qgroup rescan items */
948 struct mutex qgroup_rescan_lock; /* protects the progress item */
949 struct btrfs_key qgroup_rescan_progress;
950 struct btrfs_workqueue *qgroup_rescan_workers;
951 struct completion qgroup_rescan_completion;
952 struct btrfs_work qgroup_rescan_work;
953 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */
955 /* filesystem state */
956 unsigned long fs_state;
958 struct btrfs_delayed_root *delayed_root;
960 /* Extent buffer radix tree */
961 spinlock_t buffer_lock;
962 /* Entries are eb->start / sectorsize */
963 struct radix_tree_root buffer_radix;
965 /* next backup root to be overwritten */
966 int backup_root_index;
968 /* device replace state */
969 struct btrfs_dev_replace dev_replace;
971 struct semaphore uuid_tree_rescan_sem;
973 /* Used to reclaim the metadata space in the background. */
974 struct work_struct async_reclaim_work;
975 struct work_struct async_data_reclaim_work;
976 struct work_struct preempt_reclaim_work;
978 /* Reclaim partially filled block groups in the background */
979 struct work_struct reclaim_bgs_work;
980 struct list_head reclaim_bgs;
981 int bg_reclaim_threshold;
983 spinlock_t unused_bgs_lock;
984 struct list_head unused_bgs;
985 struct mutex unused_bg_unpin_mutex;
986 /* Protect block groups that are going to be deleted */
987 struct mutex reclaim_bgs_lock;
989 /* Cached block sizes */
992 /* ilog2 of sectorsize, use to avoid 64bit division */
998 /* Block groups and devices containing active swapfiles. */
999 spinlock_t swapfile_pins_lock;
1000 struct rb_root swapfile_pins;
1002 struct crypto_shash *csum_shash;
1004 /* Type of exclusive operation running, protected by super_lock */
1005 enum btrfs_exclusive_operation exclusive_operation;
1008 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1009 * if the mode is enabled
1016 struct mutex zoned_meta_io_lock;
1017 spinlock_t treelog_bg_lock;
1021 * Start of the dedicated data relocation block group, protected by
1022 * relocation_bg_lock.
1024 spinlock_t relocation_bg_lock;
1027 spinlock_t zone_active_bgs_lock;
1028 struct list_head zone_active_bgs;
1030 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1031 spinlock_t ref_verify_lock;
1032 struct rb_root block_tree;
1035 #ifdef CONFIG_BTRFS_DEBUG
1036 struct kobject *debug_kobj;
1037 struct kobject *discard_debug_kobj;
1038 struct list_head allocated_roots;
1040 spinlock_t eb_leak_lock;
1041 struct list_head allocated_ebs;
1045 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1047 return sb->s_fs_info;
1051 * The state of btrfs root
1055 * btrfs_record_root_in_trans is a multi-step process, and it can race
1056 * with the balancing code. But the race is very small, and only the
1057 * first time the root is added to each transaction. So IN_TRANS_SETUP
1058 * is used to tell us when more checks are required
1060 BTRFS_ROOT_IN_TRANS_SETUP,
1063 * Set if tree blocks of this root can be shared by other roots.
1064 * Only subvolume trees and their reloc trees have this bit set.
1065 * Conflicts with TRACK_DIRTY bit.
1067 * This affects two things:
1069 * - How balance works
1070 * For shareable roots, we need to use reloc tree and do path
1071 * replacement for balance, and need various pre/post hooks for
1072 * snapshot creation to handle them.
1074 * While for non-shareable trees, we just simply do a tree search
1077 * - How dirty roots are tracked
1078 * For shareable roots, btrfs_record_root_in_trans() is needed to
1079 * track them, while non-subvolume roots have TRACK_DIRTY bit, they
1080 * don't need to set this manually.
1082 BTRFS_ROOT_SHAREABLE,
1083 BTRFS_ROOT_TRACK_DIRTY,
1084 BTRFS_ROOT_IN_RADIX,
1085 BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1086 BTRFS_ROOT_DEFRAG_RUNNING,
1087 BTRFS_ROOT_FORCE_COW,
1088 BTRFS_ROOT_MULTI_LOG_TASKS,
1090 BTRFS_ROOT_DELETING,
1093 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1095 * Set for the subvolume tree owning the reloc tree.
1097 BTRFS_ROOT_DEAD_RELOC_TREE,
1098 /* Mark dead root stored on device whose cleanup needs to be resumed */
1099 BTRFS_ROOT_DEAD_TREE,
1100 /* The root has a log tree. Used for subvolume roots and the tree root. */
1101 BTRFS_ROOT_HAS_LOG_TREE,
1102 /* Qgroup flushing is in progress */
1103 BTRFS_ROOT_QGROUP_FLUSHING,
1104 /* We started the orphan cleanup for this root. */
1105 BTRFS_ROOT_ORPHAN_CLEANUP,
1109 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1110 * code. For detail check comment in fs/btrfs/qgroup.c.
1112 struct btrfs_qgroup_swapped_blocks {
1114 /* RM_EMPTY_ROOT() of above blocks[] */
1116 struct rb_root blocks[BTRFS_MAX_LEVEL];
1120 * in ram representation of the tree. extent_root is used for all allocations
1121 * and for the extent tree extent_root root.
1124 struct rb_node rb_node;
1126 struct extent_buffer *node;
1128 struct extent_buffer *commit_root;
1129 struct btrfs_root *log_root;
1130 struct btrfs_root *reloc_root;
1132 unsigned long state;
1133 struct btrfs_root_item root_item;
1134 struct btrfs_key root_key;
1135 struct btrfs_fs_info *fs_info;
1136 struct extent_io_tree dirty_log_pages;
1138 struct mutex objectid_mutex;
1140 spinlock_t accounting_lock;
1141 struct btrfs_block_rsv *block_rsv;
1143 struct mutex log_mutex;
1144 wait_queue_head_t log_writer_wait;
1145 wait_queue_head_t log_commit_wait[2];
1146 struct list_head log_ctxs[2];
1147 /* Used only for log trees of subvolumes, not for the log root tree */
1148 atomic_t log_writers;
1149 atomic_t log_commit[2];
1150 /* Used only for log trees of subvolumes, not for the log root tree */
1153 /* No matter the commit succeeds or not*/
1154 int log_transid_committed;
1155 /* Just be updated when the commit succeeds. */
1156 int last_log_commit;
1157 pid_t log_start_pid;
1165 struct btrfs_key defrag_progress;
1166 struct btrfs_key defrag_max;
1168 /* The dirty list is only used by non-shareable roots */
1169 struct list_head dirty_list;
1171 struct list_head root_list;
1173 spinlock_t log_extents_lock[2];
1174 struct list_head logged_list[2];
1176 spinlock_t inode_lock;
1177 /* red-black tree that keeps track of in-memory inodes */
1178 struct rb_root inode_tree;
1181 * radix tree that keeps track of delayed nodes of every inode,
1182 * protected by inode_lock
1184 struct radix_tree_root delayed_nodes_tree;
1186 * right now this just gets used so that a root has its own devid
1187 * for stat. It may be used for more later
1191 spinlock_t root_item_lock;
1194 struct mutex delalloc_mutex;
1195 spinlock_t delalloc_lock;
1197 * all of the inodes that have delalloc bytes. It is possible for
1198 * this list to be empty even when there is still dirty data=ordered
1199 * extents waiting to finish IO.
1201 struct list_head delalloc_inodes;
1202 struct list_head delalloc_root;
1203 u64 nr_delalloc_inodes;
1205 struct mutex ordered_extent_mutex;
1207 * this is used by the balancing code to wait for all the pending
1210 spinlock_t ordered_extent_lock;
1213 * all of the data=ordered extents pending writeback
1214 * these can span multiple transactions and basically include
1215 * every dirty data page that isn't from nodatacow
1217 struct list_head ordered_extents;
1218 struct list_head ordered_root;
1219 u64 nr_ordered_extents;
1222 * Not empty if this subvolume root has gone through tree block swap
1225 * Will be used by reloc_control::dirty_subvol_roots.
1227 struct list_head reloc_dirty_list;
1230 * Number of currently running SEND ioctls to prevent
1231 * manipulation with the read-only status via SUBVOL_SETFLAGS
1233 int send_in_progress;
1235 * Number of currently running deduplication operations that have a
1236 * destination inode belonging to this root. Protected by the lock
1239 int dedupe_in_progress;
1240 /* For exclusion of snapshot creation and nocow writes */
1241 struct btrfs_drew_lock snapshot_lock;
1243 atomic_t snapshot_force_cow;
1245 /* For qgroup metadata reserved space */
1246 spinlock_t qgroup_meta_rsv_lock;
1247 u64 qgroup_meta_rsv_pertrans;
1248 u64 qgroup_meta_rsv_prealloc;
1249 wait_queue_head_t qgroup_flush_wait;
1251 /* Number of active swapfiles */
1252 atomic_t nr_swapfiles;
1254 /* Record pairs of swapped blocks for qgroup */
1255 struct btrfs_qgroup_swapped_blocks swapped_blocks;
1257 /* Used only by log trees, when logging csum items */
1258 struct extent_io_tree log_csum_range;
1260 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1264 #ifdef CONFIG_BTRFS_DEBUG
1265 struct list_head leak_list;
1270 * Structure that conveys information about an extent that is going to replace
1271 * all the extents in a file range.
1273 struct btrfs_replace_extent_info {
1279 /* Pointer to a file extent item of type regular or prealloc. */
1282 * Set to true when attempting to replace a file range with a new extent
1283 * described by this structure, set to false when attempting to clone an
1284 * existing extent into a file range.
1287 /* Meaningful only if is_new_extent is true. */
1288 int qgroup_reserved;
1290 * Meaningful only if is_new_extent is true.
1291 * Used to track how many extent items we have already inserted in a
1292 * subvolume tree that refer to the extent described by this structure,
1293 * so that we know when to create a new delayed ref or update an existing
1299 /* Arguments for btrfs_drop_extents() */
1300 struct btrfs_drop_extents_args {
1301 /* Input parameters */
1304 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1305 * If 'replace_extent' is true, this must not be NULL. Also the path
1306 * is always released except if 'replace_extent' is true and
1307 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1308 * the path is kept locked.
1310 struct btrfs_path *path;
1311 /* Start offset of the range to drop extents from */
1313 /* End (exclusive, last byte + 1) of the range to drop extents from */
1315 /* If true drop all the extent maps in the range */
1318 * If true it means we want to insert a new extent after dropping all
1319 * the extents in the range. If this is true, the 'extent_item_size'
1320 * parameter must be set as well and the 'extent_inserted' field will
1321 * be set to true by btrfs_drop_extents() if it could insert the new
1323 * Note: when this is set to true the path must not be NULL.
1325 bool replace_extent;
1327 * Used if 'replace_extent' is true. Size of the file extent item to
1328 * insert after dropping all existing extents in the range
1330 u32 extent_item_size;
1332 /* Output parameters */
1335 * Set to the minimum between the input parameter 'end' and the end
1336 * (exclusive, last byte + 1) of the last dropped extent. This is always
1337 * set even if btrfs_drop_extents() returns an error.
1341 * The number of allocated bytes found in the range. This can be smaller
1342 * than the range's length when there are holes in the range.
1346 * Only set if 'replace_extent' is true. Set to true if we were able
1347 * to insert a replacement extent after dropping all extents in the
1348 * range, otherwise set to false by btrfs_drop_extents().
1349 * Also, if btrfs_drop_extents() has set this to true it means it
1350 * returned with the path locked, otherwise if it has set this to
1351 * false it has returned with the path released.
1353 bool extent_inserted;
1356 struct btrfs_file_private {
1361 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1364 return info->nodesize - sizeof(struct btrfs_header);
1367 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items)
1369 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1371 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1374 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1376 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1379 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1380 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1381 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1383 return BTRFS_MAX_ITEM_SIZE(info) -
1384 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1387 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1389 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1393 * Flags for mount options.
1395 * Note: don't forget to add new options to btrfs_show_options()
1398 BTRFS_MOUNT_NODATASUM = (1UL << 0),
1399 BTRFS_MOUNT_NODATACOW = (1UL << 1),
1400 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
1401 BTRFS_MOUNT_SSD = (1UL << 3),
1402 BTRFS_MOUNT_DEGRADED = (1UL << 4),
1403 BTRFS_MOUNT_COMPRESS = (1UL << 5),
1404 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
1405 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
1406 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
1407 BTRFS_MOUNT_NOSSD = (1UL << 9),
1408 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
1409 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
1410 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
1411 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
1412 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
1413 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
1414 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
1415 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
1416 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
1417 BTRFS_MOUNT_CHECK_INTEGRITY = (1UL << 19),
1418 BTRFS_MOUNT_CHECK_INTEGRITY_DATA = (1UL << 20),
1419 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 21),
1420 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 22),
1421 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 23),
1422 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 24),
1423 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 25),
1424 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 26),
1425 BTRFS_MOUNT_REF_VERIFY = (1UL << 27),
1426 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 28),
1427 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 29),
1428 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 30),
1431 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1432 #define BTRFS_DEFAULT_MAX_INLINE (2048)
1434 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1435 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1436 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1437 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1440 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1442 if (!btrfs_test_opt(fs_info, opt)) \
1443 btrfs_info(fs_info, fmt, ##args); \
1444 btrfs_set_opt(fs_info->mount_opt, opt); \
1447 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1449 if (btrfs_test_opt(fs_info, opt)) \
1450 btrfs_info(fs_info, fmt, ##args); \
1451 btrfs_clear_opt(fs_info->mount_opt, opt); \
1455 * Requests for changes that need to be done during transaction commit.
1457 * Internal mount options that are used for special handling of the real
1458 * mount options (eg. cannot be set during remount and have to be set during
1459 * transaction commit)
1462 #define BTRFS_PENDING_COMMIT (0)
1464 #define btrfs_test_pending(info, opt) \
1465 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1466 #define btrfs_set_pending(info, opt) \
1467 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1468 #define btrfs_clear_pending(info, opt) \
1469 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1472 * Helpers for setting pending mount option changes.
1474 * Expects corresponding macros
1475 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1477 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1479 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1480 btrfs_info((info), fmt, ##args); \
1481 btrfs_set_pending((info), SET_##opt); \
1482 btrfs_clear_pending((info), CLEAR_##opt); \
1486 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1488 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1489 btrfs_info((info), fmt, ##args); \
1490 btrfs_set_pending((info), CLEAR_##opt); \
1491 btrfs_clear_pending((info), SET_##opt); \
1498 #define BTRFS_INODE_NODATASUM (1U << 0)
1499 #define BTRFS_INODE_NODATACOW (1U << 1)
1500 #define BTRFS_INODE_READONLY (1U << 2)
1501 #define BTRFS_INODE_NOCOMPRESS (1U << 3)
1502 #define BTRFS_INODE_PREALLOC (1U << 4)
1503 #define BTRFS_INODE_SYNC (1U << 5)
1504 #define BTRFS_INODE_IMMUTABLE (1U << 6)
1505 #define BTRFS_INODE_APPEND (1U << 7)
1506 #define BTRFS_INODE_NODUMP (1U << 8)
1507 #define BTRFS_INODE_NOATIME (1U << 9)
1508 #define BTRFS_INODE_DIRSYNC (1U << 10)
1509 #define BTRFS_INODE_COMPRESS (1U << 11)
1511 #define BTRFS_INODE_ROOT_ITEM_INIT (1U << 31)
1513 #define BTRFS_INODE_FLAG_MASK \
1514 (BTRFS_INODE_NODATASUM | \
1515 BTRFS_INODE_NODATACOW | \
1516 BTRFS_INODE_READONLY | \
1517 BTRFS_INODE_NOCOMPRESS | \
1518 BTRFS_INODE_PREALLOC | \
1519 BTRFS_INODE_SYNC | \
1520 BTRFS_INODE_IMMUTABLE | \
1521 BTRFS_INODE_APPEND | \
1522 BTRFS_INODE_NODUMP | \
1523 BTRFS_INODE_NOATIME | \
1524 BTRFS_INODE_DIRSYNC | \
1525 BTRFS_INODE_COMPRESS | \
1526 BTRFS_INODE_ROOT_ITEM_INIT)
1528 #define BTRFS_INODE_RO_VERITY (1U << 0)
1530 #define BTRFS_INODE_RO_FLAG_MASK (BTRFS_INODE_RO_VERITY)
1532 struct btrfs_map_token {
1533 struct extent_buffer *eb;
1535 unsigned long offset;
1538 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1539 ((bytes) >> (fs_info)->sectorsize_bits)
1541 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1542 struct extent_buffer *eb)
1545 token->kaddr = page_address(eb->pages[0]);
1549 /* some macros to generate set/get functions for the struct fields. This
1550 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1553 #define le8_to_cpu(v) (v)
1554 #define cpu_to_le8(v) (v)
1557 static inline u8 get_unaligned_le8(const void *p)
1562 static inline void put_unaligned_le8(u8 val, void *p)
1567 #define read_eb_member(eb, ptr, type, member, result) (\
1568 read_extent_buffer(eb, (char *)(result), \
1569 ((unsigned long)(ptr)) + \
1570 offsetof(type, member), \
1571 sizeof(((type *)0)->member)))
1573 #define write_eb_member(eb, ptr, type, member, result) (\
1574 write_extent_buffer(eb, (char *)(result), \
1575 ((unsigned long)(ptr)) + \
1576 offsetof(type, member), \
1577 sizeof(((type *)0)->member)))
1579 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1580 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
1581 const void *ptr, unsigned long off); \
1582 void btrfs_set_token_##bits(struct btrfs_map_token *token, \
1583 const void *ptr, unsigned long off, \
1585 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
1586 const void *ptr, unsigned long off); \
1587 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
1588 unsigned long off, u##bits val);
1590 DECLARE_BTRFS_SETGET_BITS(8)
1591 DECLARE_BTRFS_SETGET_BITS(16)
1592 DECLARE_BTRFS_SETGET_BITS(32)
1593 DECLARE_BTRFS_SETGET_BITS(64)
1595 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1596 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1599 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1600 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1602 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1605 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1606 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1608 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
1611 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1612 return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1614 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1615 type *s, u##bits val) \
1617 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1618 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
1621 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1622 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1624 const type *p = page_address(eb->pages[0]) + \
1625 offset_in_page(eb->start); \
1626 return get_unaligned_le##bits(&p->member); \
1628 static inline void btrfs_set_##name(const struct extent_buffer *eb, \
1631 type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1632 put_unaligned_le##bits(val, &p->member); \
1635 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1636 static inline u##bits btrfs_##name(const type *s) \
1638 return get_unaligned_le##bits(&s->member); \
1640 static inline void btrfs_set_##name(type *s, u##bits val) \
1642 put_unaligned_le##bits(val, &s->member); \
1645 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1646 struct btrfs_dev_item *s)
1648 BUILD_BUG_ON(sizeof(u64) !=
1649 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1650 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1653 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1654 struct btrfs_dev_item *s,
1657 BUILD_BUG_ON(sizeof(u64) !=
1658 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1659 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1660 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1664 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1665 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1666 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1667 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1668 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1670 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1671 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1672 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1673 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1674 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1675 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1677 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1678 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1680 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1682 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1684 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1686 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1688 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1689 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1691 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1693 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1695 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1698 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1700 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1703 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1705 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1708 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1709 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1710 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1711 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1712 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1713 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1714 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1715 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1716 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1717 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1718 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1720 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1722 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1725 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1726 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1727 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1729 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1731 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1733 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1735 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1736 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1738 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1740 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1741 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1743 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1746 unsigned long offset = (unsigned long)c;
1747 offset += offsetof(struct btrfs_chunk, stripe);
1748 offset += nr * sizeof(struct btrfs_stripe);
1749 return (struct btrfs_stripe *)offset;
1752 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1754 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1757 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1758 struct btrfs_chunk *c, int nr)
1760 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1763 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1764 struct btrfs_chunk *c, int nr)
1766 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1769 /* struct btrfs_block_group_item */
1770 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1772 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1774 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1775 struct btrfs_block_group_item, chunk_objectid, 64);
1777 BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1778 struct btrfs_block_group_item, chunk_objectid, 64);
1779 BTRFS_SETGET_FUNCS(block_group_flags,
1780 struct btrfs_block_group_item, flags, 64);
1781 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1782 struct btrfs_block_group_item, flags, 64);
1784 /* struct btrfs_free_space_info */
1785 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1787 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1789 /* struct btrfs_inode_ref */
1790 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1791 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1793 /* struct btrfs_inode_extref */
1794 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1795 parent_objectid, 64);
1796 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1798 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1800 /* struct btrfs_inode_item */
1801 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1802 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1803 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1804 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1805 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1806 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1807 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1808 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1809 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1810 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1811 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1812 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1813 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1815 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1817 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1819 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1820 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1822 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1824 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1825 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1826 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1827 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1828 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1829 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1830 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1831 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1832 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1833 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1835 /* struct btrfs_dev_extent */
1836 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1838 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1839 chunk_objectid, 64);
1840 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1842 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1843 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1844 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1846 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1848 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1850 static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1851 struct btrfs_tree_block_info *item,
1852 struct btrfs_disk_key *key)
1854 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1857 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1858 struct btrfs_tree_block_info *item,
1859 struct btrfs_disk_key *key)
1861 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1864 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1866 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1868 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1870 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1873 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1876 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1878 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1881 static inline u32 btrfs_extent_inline_ref_size(int type)
1883 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1884 type == BTRFS_SHARED_BLOCK_REF_KEY)
1885 return sizeof(struct btrfs_extent_inline_ref);
1886 if (type == BTRFS_SHARED_DATA_REF_KEY)
1887 return sizeof(struct btrfs_shared_data_ref) +
1888 sizeof(struct btrfs_extent_inline_ref);
1889 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1890 return sizeof(struct btrfs_extent_data_ref) +
1891 offsetof(struct btrfs_extent_inline_ref, offset);
1895 /* struct btrfs_node */
1896 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1897 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1898 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1900 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1903 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1906 ptr = offsetof(struct btrfs_node, ptrs) +
1907 sizeof(struct btrfs_key_ptr) * nr;
1908 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1911 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1915 ptr = offsetof(struct btrfs_node, ptrs) +
1916 sizeof(struct btrfs_key_ptr) * nr;
1917 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1920 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1923 ptr = offsetof(struct btrfs_node, ptrs) +
1924 sizeof(struct btrfs_key_ptr) * nr;
1925 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1928 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1932 ptr = offsetof(struct btrfs_node, ptrs) +
1933 sizeof(struct btrfs_key_ptr) * nr;
1934 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1937 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1939 return offsetof(struct btrfs_node, ptrs) +
1940 sizeof(struct btrfs_key_ptr) * nr;
1943 void btrfs_node_key(const struct extent_buffer *eb,
1944 struct btrfs_disk_key *disk_key, int nr);
1946 static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1947 struct btrfs_disk_key *disk_key, int nr)
1950 ptr = btrfs_node_key_ptr_offset(nr);
1951 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1952 struct btrfs_key_ptr, key, disk_key);
1955 /* struct btrfs_item */
1956 BTRFS_SETGET_FUNCS(raw_item_offset, struct btrfs_item, offset, 32);
1957 BTRFS_SETGET_FUNCS(raw_item_size, struct btrfs_item, size, 32);
1958 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1959 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1961 static inline unsigned long btrfs_item_nr_offset(int nr)
1963 return offsetof(struct btrfs_leaf, items) +
1964 sizeof(struct btrfs_item) * nr;
1967 static inline struct btrfs_item *btrfs_item_nr(int nr)
1969 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1972 #define BTRFS_ITEM_SETGET_FUNCS(member) \
1973 static inline u32 btrfs_item_##member(const struct extent_buffer *eb, \
1976 return btrfs_raw_item_##member(eb, btrfs_item_nr(slot)); \
1978 static inline void btrfs_set_item_##member(const struct extent_buffer *eb, \
1979 int slot, u32 val) \
1981 btrfs_set_raw_item_##member(eb, btrfs_item_nr(slot), val); \
1983 static inline u32 btrfs_token_item_##member(struct btrfs_map_token *token, \
1986 struct btrfs_item *item = btrfs_item_nr(slot); \
1987 return btrfs_token_raw_item_##member(token, item); \
1989 static inline void btrfs_set_token_item_##member(struct btrfs_map_token *token, \
1990 int slot, u32 val) \
1992 struct btrfs_item *item = btrfs_item_nr(slot); \
1993 btrfs_set_token_raw_item_##member(token, item, val); \
1996 BTRFS_ITEM_SETGET_FUNCS(offset)
1997 BTRFS_ITEM_SETGET_FUNCS(size);
1999 static inline u32 btrfs_item_data_end(const struct extent_buffer *eb, int nr)
2001 return btrfs_item_offset(eb, nr) + btrfs_item_size(eb, nr);
2004 static inline void btrfs_item_key(const struct extent_buffer *eb,
2005 struct btrfs_disk_key *disk_key, int nr)
2007 struct btrfs_item *item = btrfs_item_nr(nr);
2008 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2011 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2012 struct btrfs_disk_key *disk_key, int nr)
2014 struct btrfs_item *item = btrfs_item_nr(nr);
2015 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2018 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2021 * struct btrfs_root_ref
2023 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2024 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2025 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2027 /* struct btrfs_dir_item */
2028 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2029 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2030 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2031 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2032 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2033 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2035 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2037 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2040 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2041 const struct btrfs_dir_item *item,
2042 struct btrfs_disk_key *key)
2044 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2047 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2048 struct btrfs_dir_item *item,
2049 const struct btrfs_disk_key *key)
2051 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2054 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2056 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2058 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2061 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2062 const struct btrfs_free_space_header *h,
2063 struct btrfs_disk_key *key)
2065 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2068 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2069 struct btrfs_free_space_header *h,
2070 const struct btrfs_disk_key *key)
2072 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2075 /* struct btrfs_disk_key */
2076 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2078 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2079 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2081 #ifdef __LITTLE_ENDIAN
2084 * Optimized helpers for little-endian architectures where CPU and on-disk
2085 * structures have the same endianness and we can skip conversions.
2088 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2089 const struct btrfs_disk_key *disk_key)
2091 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2094 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2095 const struct btrfs_key *cpu_key)
2097 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2100 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2101 struct btrfs_key *cpu_key, int nr)
2103 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2105 btrfs_node_key(eb, disk_key, nr);
2108 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2109 struct btrfs_key *cpu_key, int nr)
2111 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2113 btrfs_item_key(eb, disk_key, nr);
2116 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2117 const struct btrfs_dir_item *item,
2118 struct btrfs_key *cpu_key)
2120 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2122 btrfs_dir_item_key(eb, item, disk_key);
2127 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2128 const struct btrfs_disk_key *disk)
2130 cpu->offset = le64_to_cpu(disk->offset);
2131 cpu->type = disk->type;
2132 cpu->objectid = le64_to_cpu(disk->objectid);
2135 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2136 const struct btrfs_key *cpu)
2138 disk->offset = cpu_to_le64(cpu->offset);
2139 disk->type = cpu->type;
2140 disk->objectid = cpu_to_le64(cpu->objectid);
2143 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2144 struct btrfs_key *key, int nr)
2146 struct btrfs_disk_key disk_key;
2147 btrfs_node_key(eb, &disk_key, nr);
2148 btrfs_disk_key_to_cpu(key, &disk_key);
2151 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2152 struct btrfs_key *key, int nr)
2154 struct btrfs_disk_key disk_key;
2155 btrfs_item_key(eb, &disk_key, nr);
2156 btrfs_disk_key_to_cpu(key, &disk_key);
2159 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2160 const struct btrfs_dir_item *item,
2161 struct btrfs_key *key)
2163 struct btrfs_disk_key disk_key;
2164 btrfs_dir_item_key(eb, item, &disk_key);
2165 btrfs_disk_key_to_cpu(key, &disk_key);
2170 /* struct btrfs_header */
2171 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2172 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2174 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2175 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2176 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2177 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2178 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2180 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2181 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2183 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2185 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2187 return (btrfs_header_flags(eb) & flag) == flag;
2190 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2192 u64 flags = btrfs_header_flags(eb);
2193 btrfs_set_header_flags(eb, flags | flag);
2196 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2198 u64 flags = btrfs_header_flags(eb);
2199 btrfs_set_header_flags(eb, flags & ~flag);
2202 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2204 u64 flags = btrfs_header_flags(eb);
2205 return flags >> BTRFS_BACKREF_REV_SHIFT;
2208 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2211 u64 flags = btrfs_header_flags(eb);
2212 flags &= ~BTRFS_BACKREF_REV_MASK;
2213 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2214 btrfs_set_header_flags(eb, flags);
2217 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2219 return btrfs_header_level(eb) == 0;
2222 /* struct btrfs_root_item */
2223 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2225 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2226 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2227 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2229 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2231 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2232 BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2233 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2234 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2235 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2236 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2237 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2238 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2239 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2241 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2243 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2245 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2247 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2249 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2252 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2254 /* Byte-swap the constant at compile time, root_item::flags is LE */
2255 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2258 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2260 /* Byte-swap the constant at compile time, root_item::flags is LE */
2261 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2264 static inline u64 btrfs_root_id(const struct btrfs_root *root)
2266 return root->root_key.objectid;
2269 /* struct btrfs_root_backup */
2270 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2272 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2274 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2275 tree_root_level, 8);
2277 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2279 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2280 chunk_root_gen, 64);
2281 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2282 chunk_root_level, 8);
2284 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2286 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2287 extent_root_gen, 64);
2288 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2289 extent_root_level, 8);
2291 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2293 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2295 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2298 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2300 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2302 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2305 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2307 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2309 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2310 csum_root_level, 8);
2311 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2313 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2315 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2318 /* struct btrfs_balance_item */
2319 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2321 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2322 const struct btrfs_balance_item *bi,
2323 struct btrfs_disk_balance_args *ba)
2325 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2328 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2329 struct btrfs_balance_item *bi,
2330 const struct btrfs_disk_balance_args *ba)
2332 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2335 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2336 const struct btrfs_balance_item *bi,
2337 struct btrfs_disk_balance_args *ba)
2339 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2342 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2343 struct btrfs_balance_item *bi,
2344 const struct btrfs_disk_balance_args *ba)
2346 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2349 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2350 const struct btrfs_balance_item *bi,
2351 struct btrfs_disk_balance_args *ba)
2353 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2356 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2357 struct btrfs_balance_item *bi,
2358 const struct btrfs_disk_balance_args *ba)
2360 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2364 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2365 const struct btrfs_disk_balance_args *disk)
2367 memset(cpu, 0, sizeof(*cpu));
2369 cpu->profiles = le64_to_cpu(disk->profiles);
2370 cpu->usage = le64_to_cpu(disk->usage);
2371 cpu->devid = le64_to_cpu(disk->devid);
2372 cpu->pstart = le64_to_cpu(disk->pstart);
2373 cpu->pend = le64_to_cpu(disk->pend);
2374 cpu->vstart = le64_to_cpu(disk->vstart);
2375 cpu->vend = le64_to_cpu(disk->vend);
2376 cpu->target = le64_to_cpu(disk->target);
2377 cpu->flags = le64_to_cpu(disk->flags);
2378 cpu->limit = le64_to_cpu(disk->limit);
2379 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2380 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2384 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2385 const struct btrfs_balance_args *cpu)
2387 memset(disk, 0, sizeof(*disk));
2389 disk->profiles = cpu_to_le64(cpu->profiles);
2390 disk->usage = cpu_to_le64(cpu->usage);
2391 disk->devid = cpu_to_le64(cpu->devid);
2392 disk->pstart = cpu_to_le64(cpu->pstart);
2393 disk->pend = cpu_to_le64(cpu->pend);
2394 disk->vstart = cpu_to_le64(cpu->vstart);
2395 disk->vend = cpu_to_le64(cpu->vend);
2396 disk->target = cpu_to_le64(cpu->target);
2397 disk->flags = cpu_to_le64(cpu->flags);
2398 disk->limit = cpu_to_le64(cpu->limit);
2399 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2400 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2403 /* struct btrfs_super_block */
2404 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2405 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2406 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2408 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2409 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2410 struct btrfs_super_block, sys_chunk_array_size, 32);
2411 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2412 struct btrfs_super_block, chunk_root_generation, 64);
2413 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2415 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2417 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2418 chunk_root_level, 8);
2419 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2421 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2422 log_root_transid, 64);
2423 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2425 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2427 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2429 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2431 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2433 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2435 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2436 root_dir_objectid, 64);
2437 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2439 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2441 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2442 compat_ro_flags, 64);
2443 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2444 incompat_flags, 64);
2445 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2447 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2448 cache_generation, 64);
2449 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2450 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2451 uuid_tree_generation, 64);
2453 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2454 const char *btrfs_super_csum_name(u16 csum_type);
2455 const char *btrfs_super_csum_driver(u16 csum_type);
2456 size_t __attribute_const__ btrfs_get_num_csums(void);
2460 * The leaf data grows from end-to-front in the node.
2461 * this returns the address of the start of the last item,
2462 * which is the stop of the leaf data stack
2464 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2466 u32 nr = btrfs_header_nritems(leaf);
2469 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2470 return btrfs_item_offset(leaf, nr - 1);
2473 /* struct btrfs_file_extent_item */
2474 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2476 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2477 struct btrfs_file_extent_item, disk_bytenr, 64);
2478 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2479 struct btrfs_file_extent_item, offset, 64);
2480 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2481 struct btrfs_file_extent_item, generation, 64);
2482 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2483 struct btrfs_file_extent_item, num_bytes, 64);
2484 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2485 struct btrfs_file_extent_item, ram_bytes, 64);
2486 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2487 struct btrfs_file_extent_item, disk_num_bytes, 64);
2488 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2489 struct btrfs_file_extent_item, compression, 8);
2491 static inline unsigned long
2492 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2494 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2497 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2499 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2502 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2503 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2505 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2507 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2508 disk_num_bytes, 64);
2509 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2511 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2513 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2515 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2517 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2519 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2520 other_encoding, 16);
2523 * this returns the number of bytes used by the item on disk, minus the
2524 * size of any extent headers. If a file is compressed on disk, this is
2525 * the compressed size
2527 static inline u32 btrfs_file_extent_inline_item_len(
2528 const struct extent_buffer *eb,
2531 return btrfs_item_size(eb, nr) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2534 /* btrfs_qgroup_status_item */
2535 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2537 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2539 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2541 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2544 /* btrfs_qgroup_info_item */
2545 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2547 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2548 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2550 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2551 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2554 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2555 struct btrfs_qgroup_info_item, generation, 64);
2556 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2558 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2559 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2560 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2562 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2563 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2565 /* btrfs_qgroup_limit_item */
2566 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2568 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2570 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2572 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2574 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2577 /* btrfs_dev_replace_item */
2578 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2579 struct btrfs_dev_replace_item, src_devid, 64);
2580 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2581 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2583 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2585 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2587 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2589 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2590 num_write_errors, 64);
2591 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2592 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2594 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2596 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2599 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2600 struct btrfs_dev_replace_item, src_devid, 64);
2601 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2602 struct btrfs_dev_replace_item,
2603 cont_reading_from_srcdev_mode, 64);
2604 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2605 struct btrfs_dev_replace_item, replace_state, 64);
2606 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2607 struct btrfs_dev_replace_item, time_started, 64);
2608 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2609 struct btrfs_dev_replace_item, time_stopped, 64);
2610 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2611 struct btrfs_dev_replace_item, num_write_errors, 64);
2612 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2613 struct btrfs_dev_replace_item,
2614 num_uncorrectable_read_errors, 64);
2615 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2616 struct btrfs_dev_replace_item, cursor_left, 64);
2617 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2618 struct btrfs_dev_replace_item, cursor_right, 64);
2620 /* helper function to cast into the data area of the leaf. */
2621 #define btrfs_item_ptr(leaf, slot, type) \
2622 ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2623 btrfs_item_offset(leaf, slot)))
2625 #define btrfs_item_ptr_offset(leaf, slot) \
2626 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2627 btrfs_item_offset(leaf, slot)))
2629 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2631 return crc32c(crc, address, length);
2634 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2636 put_unaligned_le32(~crc, result);
2639 static inline u64 btrfs_name_hash(const char *name, int len)
2641 return crc32c((u32)~1, name, len);
2645 * Figure the key offset of an extended inode ref
2647 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2650 return (u64) crc32c(parent_objectid, name, len);
2653 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2655 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2660 enum btrfs_inline_ref_type {
2661 BTRFS_REF_TYPE_INVALID,
2662 BTRFS_REF_TYPE_BLOCK,
2663 BTRFS_REF_TYPE_DATA,
2667 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2668 struct btrfs_extent_inline_ref *iref,
2669 enum btrfs_inline_ref_type is_data);
2670 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2673 * Take the number of bytes to be checksummmed and figure out how many leaves
2674 * it would require to store the csums for that many bytes.
2676 static inline u64 btrfs_csum_bytes_to_leaves(
2677 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2679 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2681 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2685 * Use this if we would be adding new items, as we could split nodes as we cow
2688 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2691 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2695 * Doing a truncate or a modification won't result in new nodes or leaves, just
2696 * what we need for COW.
2698 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2701 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2704 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2705 u64 start, u64 num_bytes);
2706 void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2707 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2708 unsigned long count);
2709 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2710 struct btrfs_delayed_ref_root *delayed_refs,
2711 struct btrfs_delayed_ref_head *head);
2712 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2713 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2714 struct btrfs_fs_info *fs_info, u64 bytenr,
2715 u64 offset, int metadata, u64 *refs, u64 *flags);
2716 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2718 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2719 u64 bytenr, u64 num_bytes);
2720 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2721 int btrfs_cross_ref_exist(struct btrfs_root *root,
2722 u64 objectid, u64 offset, u64 bytenr, bool strict);
2723 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2724 struct btrfs_root *root,
2725 u64 parent, u64 root_objectid,
2726 const struct btrfs_disk_key *key,
2727 int level, u64 hint,
2729 enum btrfs_lock_nesting nest);
2730 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2732 struct extent_buffer *buf,
2733 u64 parent, int last_ref);
2734 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2735 struct btrfs_root *root, u64 owner,
2736 u64 offset, u64 ram_bytes,
2737 struct btrfs_key *ins);
2738 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2739 u64 root_objectid, u64 owner, u64 offset,
2740 struct btrfs_key *ins);
2741 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2742 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2743 struct btrfs_key *ins, int is_data, int delalloc);
2744 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2745 struct extent_buffer *buf, int full_backref);
2746 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2747 struct extent_buffer *buf, int full_backref);
2748 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2749 struct extent_buffer *eb, u64 flags,
2750 int level, int is_data);
2751 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2753 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2754 u64 start, u64 len, int delalloc);
2755 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2757 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2758 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2759 struct btrfs_ref *generic_ref);
2761 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2764 * Different levels for to flush space when doing space reservations.
2766 * The higher the level, the more methods we try to reclaim space.
2768 enum btrfs_reserve_flush_enum {
2769 /* If we are in the transaction, we can't flush anything.*/
2770 BTRFS_RESERVE_NO_FLUSH,
2774 * - Running delayed inode items
2775 * - Allocating a new chunk
2777 BTRFS_RESERVE_FLUSH_LIMIT,
2781 * - Running delayed inode items
2782 * - Running delayed refs
2783 * - Running delalloc and waiting for ordered extents
2784 * - Allocating a new chunk
2786 BTRFS_RESERVE_FLUSH_EVICT,
2789 * Flush space by above mentioned methods and by:
2790 * - Running delayed iputs
2791 * - Committing transaction
2793 * Can be interrupted by a fatal signal.
2795 BTRFS_RESERVE_FLUSH_DATA,
2796 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2797 BTRFS_RESERVE_FLUSH_ALL,
2800 * Pretty much the same as FLUSH_ALL, but can also steal space from
2803 * Can be interrupted by a fatal signal.
2805 BTRFS_RESERVE_FLUSH_ALL_STEAL,
2808 enum btrfs_flush_state {
2809 FLUSH_DELAYED_ITEMS_NR = 1,
2810 FLUSH_DELAYED_ITEMS = 2,
2811 FLUSH_DELAYED_REFS_NR = 3,
2812 FLUSH_DELAYED_REFS = 4,
2814 FLUSH_DELALLOC_WAIT = 6,
2815 FLUSH_DELALLOC_FULL = 7,
2817 ALLOC_CHUNK_FORCE = 9,
2818 RUN_DELAYED_IPUTS = 10,
2822 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2823 struct btrfs_block_rsv *rsv,
2824 int nitems, bool use_global_rsv);
2825 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2826 struct btrfs_block_rsv *rsv);
2827 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2829 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2830 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2831 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2832 u64 start, u64 end);
2833 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2834 u64 num_bytes, u64 *actual_bytes);
2835 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2837 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2838 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2839 struct btrfs_fs_info *fs_info);
2840 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2841 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2842 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2845 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2847 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2848 int btrfs_previous_item(struct btrfs_root *root,
2849 struct btrfs_path *path, u64 min_objectid,
2851 int btrfs_previous_extent_item(struct btrfs_root *root,
2852 struct btrfs_path *path, u64 min_objectid);
2853 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2854 struct btrfs_path *path,
2855 const struct btrfs_key *new_key);
2856 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2857 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2858 struct btrfs_key *key, int lowest_level,
2860 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2861 struct btrfs_path *path,
2863 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2866 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2867 struct btrfs_root *root, struct extent_buffer *buf,
2868 struct extent_buffer *parent, int parent_slot,
2869 struct extent_buffer **cow_ret,
2870 enum btrfs_lock_nesting nest);
2871 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2872 struct btrfs_root *root,
2873 struct extent_buffer *buf,
2874 struct extent_buffer **cow_ret, u64 new_root_objectid);
2875 int btrfs_block_can_be_shared(struct btrfs_root *root,
2876 struct extent_buffer *buf);
2877 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2878 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2879 int btrfs_split_item(struct btrfs_trans_handle *trans,
2880 struct btrfs_root *root,
2881 struct btrfs_path *path,
2882 const struct btrfs_key *new_key,
2883 unsigned long split_offset);
2884 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2885 struct btrfs_root *root,
2886 struct btrfs_path *path,
2887 const struct btrfs_key *new_key);
2888 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2889 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2890 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2891 const struct btrfs_key *key, struct btrfs_path *p,
2892 int ins_len, int cow);
2893 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2894 struct btrfs_path *p, u64 time_seq);
2895 int btrfs_search_slot_for_read(struct btrfs_root *root,
2896 const struct btrfs_key *key,
2897 struct btrfs_path *p, int find_higher,
2899 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2900 struct btrfs_root *root, struct extent_buffer *parent,
2901 int start_slot, u64 *last_ret,
2902 struct btrfs_key *progress);
2903 void btrfs_release_path(struct btrfs_path *p);
2904 struct btrfs_path *btrfs_alloc_path(void);
2905 void btrfs_free_path(struct btrfs_path *p);
2907 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2908 struct btrfs_path *path, int slot, int nr);
2909 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2910 struct btrfs_root *root,
2911 struct btrfs_path *path)
2913 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2917 * Describes a batch of items to insert in a btree. This is used by
2918 * btrfs_insert_empty_items().
2920 struct btrfs_item_batch {
2922 * Pointer to an array containing the keys of the items to insert (in
2925 const struct btrfs_key *keys;
2926 /* Pointer to an array containing the data size for each item to insert. */
2927 const u32 *data_sizes;
2929 * The sum of data sizes for all items. The caller can compute this while
2930 * setting up the data_sizes array, so it ends up being more efficient
2931 * than having btrfs_insert_empty_items() or setup_item_for_insert()
2932 * doing it, as it would avoid an extra loop over a potentially large
2933 * array, and in the case of setup_item_for_insert(), we would be doing
2934 * it while holding a write lock on a leaf and often on upper level nodes
2935 * too, unnecessarily increasing the size of a critical section.
2937 u32 total_data_size;
2938 /* Size of the keys and data_sizes arrays (number of items in the batch). */
2942 void btrfs_setup_item_for_insert(struct btrfs_root *root,
2943 struct btrfs_path *path,
2944 const struct btrfs_key *key,
2946 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2947 const struct btrfs_key *key, void *data, u32 data_size);
2948 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2949 struct btrfs_root *root,
2950 struct btrfs_path *path,
2951 const struct btrfs_item_batch *batch);
2953 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2954 struct btrfs_root *root,
2955 struct btrfs_path *path,
2956 const struct btrfs_key *key,
2959 struct btrfs_item_batch batch;
2962 batch.data_sizes = &data_size;
2963 batch.total_data_size = data_size;
2966 return btrfs_insert_empty_items(trans, root, path, &batch);
2969 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2970 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2973 int btrfs_search_backwards(struct btrfs_root *root, struct btrfs_key *key,
2974 struct btrfs_path *path);
2976 static inline int btrfs_next_old_item(struct btrfs_root *root,
2977 struct btrfs_path *p, u64 time_seq)
2980 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2981 return btrfs_next_old_leaf(root, p, time_seq);
2986 * Search the tree again to find a leaf with greater keys.
2988 * Returns 0 if it found something or 1 if there are no greater leaves.
2989 * Returns < 0 on error.
2991 static inline int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
2993 return btrfs_next_old_leaf(root, path, 0);
2996 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2998 return btrfs_next_old_item(root, p, 0);
3000 int btrfs_leaf_free_space(struct extent_buffer *leaf);
3001 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
3003 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3004 struct btrfs_root *root,
3005 struct extent_buffer *node,
3006 struct extent_buffer *parent);
3007 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3010 * Do it this way so we only ever do one test_bit in the normal case.
3012 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
3013 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
3021 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3022 * anything except sleeping. This function is used to check the status of
3024 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
3025 * since setting and checking for SB_RDONLY in the superblock's flags is not
3028 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
3030 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
3031 btrfs_fs_closing(fs_info);
3034 static inline void btrfs_set_sb_rdonly(struct super_block *sb)
3036 sb->s_flags |= SB_RDONLY;
3037 set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3040 static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
3042 sb->s_flags &= ~SB_RDONLY;
3043 clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3047 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3048 u64 ref_id, u64 dirid, u64 sequence, const char *name,
3050 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3051 u64 ref_id, u64 dirid, u64 *sequence, const char *name,
3053 int btrfs_del_root(struct btrfs_trans_handle *trans,
3054 const struct btrfs_key *key);
3055 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3056 const struct btrfs_key *key,
3057 struct btrfs_root_item *item);
3058 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3059 struct btrfs_root *root,
3060 struct btrfs_key *key,
3061 struct btrfs_root_item *item);
3062 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3063 struct btrfs_path *path, struct btrfs_root_item *root_item,
3064 struct btrfs_key *root_key);
3065 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3066 void btrfs_set_root_node(struct btrfs_root_item *item,
3067 struct extent_buffer *node);
3068 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3069 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3070 struct btrfs_root *root);
3073 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3075 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3077 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3080 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3081 const char *name, int name_len);
3082 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3083 int name_len, struct btrfs_inode *dir,
3084 struct btrfs_key *location, u8 type, u64 index);
3085 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3086 struct btrfs_root *root,
3087 struct btrfs_path *path, u64 dir,
3088 const char *name, int name_len,
3090 struct btrfs_dir_item *
3091 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3092 struct btrfs_root *root,
3093 struct btrfs_path *path, u64 dir,
3094 u64 index, const char *name, int name_len,
3096 struct btrfs_dir_item *
3097 btrfs_search_dir_index_item(struct btrfs_root *root,
3098 struct btrfs_path *path, u64 dirid,
3099 const char *name, int name_len);
3100 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3101 struct btrfs_root *root,
3102 struct btrfs_path *path,
3103 struct btrfs_dir_item *di);
3104 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3105 struct btrfs_root *root,
3106 struct btrfs_path *path, u64 objectid,
3107 const char *name, u16 name_len,
3108 const void *data, u16 data_len);
3109 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3110 struct btrfs_root *root,
3111 struct btrfs_path *path, u64 dir,
3112 const char *name, u16 name_len,
3114 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3115 struct btrfs_path *path,
3120 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3121 struct btrfs_root *root, u64 offset);
3122 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3123 struct btrfs_root *root, u64 offset);
3124 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3127 struct btrfs_dio_private;
3128 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3129 struct btrfs_root *root, u64 bytenr, u64 len);
3130 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3131 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3132 struct btrfs_root *root,
3133 u64 objectid, u64 pos,
3134 u64 disk_offset, u64 disk_num_bytes,
3135 u64 num_bytes, u64 offset, u64 ram_bytes,
3136 u8 compression, u8 encryption, u16 other_encoding);
3137 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3138 struct btrfs_root *root,
3139 struct btrfs_path *path, u64 objectid,
3140 u64 bytenr, int mod);
3141 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3142 struct btrfs_root *root,
3143 struct btrfs_ordered_sum *sums);
3144 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3145 u64 file_start, int contig);
3146 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3147 struct list_head *list, int search_commit);
3148 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3149 const struct btrfs_path *path,
3150 struct btrfs_file_extent_item *fi,
3151 const bool new_inline,
3152 struct extent_map *em);
3153 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3155 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3157 void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3158 u64 btrfs_file_extent_end(const struct btrfs_path *path);
3161 blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3162 int mirror_num, unsigned long bio_flags);
3163 unsigned int btrfs_verify_data_csum(struct btrfs_bio *bbio,
3164 u32 bio_offset, struct page *page,
3165 u64 start, u64 end);
3166 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3167 u64 start, u64 len);
3168 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3169 u64 *orig_start, u64 *orig_block_len,
3170 u64 *ram_bytes, bool strict);
3172 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3173 struct btrfs_inode *inode);
3174 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3175 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3176 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3177 struct btrfs_inode *dir, struct btrfs_inode *inode,
3178 const char *name, int name_len);
3179 int btrfs_add_link(struct btrfs_trans_handle *trans,
3180 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3181 const char *name, int name_len, int add_backref, u64 index);
3182 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3183 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3186 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3187 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3188 bool in_reclaim_context);
3189 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3190 unsigned int extra_bits,
3191 struct extent_state **cached_state);
3192 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3193 struct btrfs_root *new_root,
3194 struct btrfs_root *parent_root,
3195 struct user_namespace *mnt_userns);
3196 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3198 void btrfs_clear_delalloc_extent(struct inode *inode,
3199 struct extent_state *state, unsigned *bits);
3200 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3201 struct extent_state *other);
3202 void btrfs_split_delalloc_extent(struct inode *inode,
3203 struct extent_state *orig, u64 split);
3204 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3205 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3206 int btrfs_readpage(struct file *file, struct page *page);
3207 void btrfs_evict_inode(struct inode *inode);
3208 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3209 struct inode *btrfs_alloc_inode(struct super_block *sb);
3210 void btrfs_destroy_inode(struct inode *inode);
3211 void btrfs_free_inode(struct inode *inode);
3212 int btrfs_drop_inode(struct inode *inode);
3213 int __init btrfs_init_cachep(void);
3214 void __cold btrfs_destroy_cachep(void);
3215 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3216 struct btrfs_root *root, struct btrfs_path *path);
3217 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3218 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3219 struct page *page, size_t pg_offset,
3220 u64 start, u64 end);
3221 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3222 struct btrfs_root *root, struct btrfs_inode *inode);
3223 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3224 struct btrfs_root *root, struct btrfs_inode *inode);
3225 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3226 struct btrfs_inode *inode);
3227 int btrfs_orphan_cleanup(struct btrfs_root *root);
3228 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3229 void btrfs_add_delayed_iput(struct inode *inode);
3230 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3231 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3232 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3233 u64 start, u64 num_bytes, u64 min_size,
3234 loff_t actual_len, u64 *alloc_hint);
3235 int btrfs_prealloc_file_range_trans(struct inode *inode,
3236 struct btrfs_trans_handle *trans, int mode,
3237 u64 start, u64 num_bytes, u64 min_size,
3238 loff_t actual_len, u64 *alloc_hint);
3239 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3240 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3241 struct writeback_control *wbc);
3242 int btrfs_writepage_cow_fixup(struct page *page);
3243 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3244 struct page *page, u64 start,
3245 u64 end, bool uptodate);
3246 extern const struct dentry_operations btrfs_dentry_operations;
3247 extern const struct iomap_ops btrfs_dio_iomap_ops;
3248 extern const struct iomap_dio_ops btrfs_dio_ops;
3250 /* Inode locking type flags, by default the exclusive lock is taken */
3251 #define BTRFS_ILOCK_SHARED (1U << 0)
3252 #define BTRFS_ILOCK_TRY (1U << 1)
3253 #define BTRFS_ILOCK_MMAP (1U << 2)
3255 int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3256 void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3257 void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3258 const u64 add_bytes,
3259 const u64 del_bytes);
3262 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3263 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3264 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3265 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3266 struct dentry *dentry, struct fileattr *fa);
3267 int btrfs_ioctl_get_supported_features(void __user *arg);
3268 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3269 int __pure btrfs_is_empty_uuid(u8 *uuid);
3270 int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
3271 struct btrfs_ioctl_defrag_range_args *range,
3272 u64 newer_than, unsigned long max_to_defrag);
3273 void btrfs_get_block_group_info(struct list_head *groups_list,
3274 struct btrfs_ioctl_space_info *space);
3275 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3276 struct btrfs_ioctl_balance_args *bargs);
3277 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3278 enum btrfs_exclusive_operation type);
3279 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3280 enum btrfs_exclusive_operation type);
3281 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3282 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3283 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
3284 enum btrfs_exclusive_operation op);
3288 int __init btrfs_auto_defrag_init(void);
3289 void __cold btrfs_auto_defrag_exit(void);
3290 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3291 struct btrfs_inode *inode);
3292 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3293 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3294 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3295 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3297 extern const struct file_operations btrfs_file_operations;
3298 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3299 struct btrfs_root *root, struct btrfs_inode *inode,
3300 struct btrfs_drop_extents_args *args);
3301 int btrfs_replace_file_extents(struct btrfs_inode *inode,
3302 struct btrfs_path *path, const u64 start,
3304 struct btrfs_replace_extent_info *extent_info,
3305 struct btrfs_trans_handle **trans_out);
3306 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3307 struct btrfs_inode *inode, u64 start, u64 end);
3308 int btrfs_release_file(struct inode *inode, struct file *file);
3309 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3310 size_t num_pages, loff_t pos, size_t write_bytes,
3311 struct extent_state **cached, bool noreserve);
3312 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3313 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3314 size_t *write_bytes);
3315 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3318 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3319 struct btrfs_root *root);
3322 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3323 unsigned long new_flags);
3324 int btrfs_sync_fs(struct super_block *sb, int wait);
3325 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3326 u64 subvol_objectid);
3328 static inline __printf(2, 3) __cold
3329 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3333 #ifdef CONFIG_PRINTK
3336 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3338 #define btrfs_printk(fs_info, fmt, args...) \
3339 btrfs_no_printk(fs_info, fmt, ##args)
3342 #define btrfs_emerg(fs_info, fmt, args...) \
3343 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3344 #define btrfs_alert(fs_info, fmt, args...) \
3345 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3346 #define btrfs_crit(fs_info, fmt, args...) \
3347 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3348 #define btrfs_err(fs_info, fmt, args...) \
3349 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3350 #define btrfs_warn(fs_info, fmt, args...) \
3351 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3352 #define btrfs_notice(fs_info, fmt, args...) \
3353 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3354 #define btrfs_info(fs_info, fmt, args...) \
3355 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3358 * Wrappers that use printk_in_rcu
3360 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3361 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3362 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3363 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3364 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3365 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3366 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3367 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3368 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3369 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3370 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3371 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3372 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3373 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3376 * Wrappers that use a ratelimited printk_in_rcu
3378 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3379 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3380 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3381 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3382 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3383 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3384 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3385 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3386 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3387 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3388 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3389 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3390 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3391 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3394 * Wrappers that use a ratelimited printk
3396 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3397 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3398 #define btrfs_alert_rl(fs_info, fmt, args...) \
3399 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3400 #define btrfs_crit_rl(fs_info, fmt, args...) \
3401 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3402 #define btrfs_err_rl(fs_info, fmt, args...) \
3403 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3404 #define btrfs_warn_rl(fs_info, fmt, args...) \
3405 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3406 #define btrfs_notice_rl(fs_info, fmt, args...) \
3407 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3408 #define btrfs_info_rl(fs_info, fmt, args...) \
3409 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3411 #if defined(CONFIG_DYNAMIC_DEBUG)
3412 #define btrfs_debug(fs_info, fmt, args...) \
3413 _dynamic_func_call_no_desc(fmt, btrfs_printk, \
3414 fs_info, KERN_DEBUG fmt, ##args)
3415 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3416 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \
3417 fs_info, KERN_DEBUG fmt, ##args)
3418 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3419 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \
3420 fs_info, KERN_DEBUG fmt, ##args)
3421 #define btrfs_debug_rl(fs_info, fmt, args...) \
3422 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \
3423 fs_info, KERN_DEBUG fmt, ##args)
3424 #elif defined(DEBUG)
3425 #define btrfs_debug(fs_info, fmt, args...) \
3426 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3427 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3428 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3429 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3430 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3431 #define btrfs_debug_rl(fs_info, fmt, args...) \
3432 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3434 #define btrfs_debug(fs_info, fmt, args...) \
3435 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3436 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3437 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3438 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3439 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3440 #define btrfs_debug_rl(fs_info, fmt, args...) \
3441 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3444 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3447 btrfs_printk(fs_info, fmt, ##args); \
3448 rcu_read_unlock(); \
3451 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \
3454 btrfs_no_printk(fs_info, fmt, ##args); \
3455 rcu_read_unlock(); \
3458 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3460 static DEFINE_RATELIMIT_STATE(_rs, \
3461 DEFAULT_RATELIMIT_INTERVAL, \
3462 DEFAULT_RATELIMIT_BURST); \
3463 if (__ratelimit(&_rs)) \
3464 btrfs_printk(fs_info, fmt, ##args); \
3467 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3470 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3471 rcu_read_unlock(); \
3474 #ifdef CONFIG_BTRFS_ASSERT
3476 static inline void assertfail(const char *expr, const char *file, int line)
3478 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3482 #define ASSERT(expr) \
3483 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3486 static inline void assertfail(const char *expr, const char* file, int line) { }
3487 #define ASSERT(expr) (void)(expr)
3490 #if BITS_PER_LONG == 32
3491 #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3493 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3494 * addresses of extents.
3496 * For 4K page size it's about 10T, for 64K it's 160T.
3498 #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3499 void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3500 void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3504 * Get the correct offset inside the page of extent buffer.
3506 * @eb: target extent buffer
3507 * @start: offset inside the extent buffer
3509 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3511 static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3512 unsigned long offset)
3515 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3516 * to PAGE_SIZE, thus adding it won't cause any difference.
3518 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3519 * to the eb, thus we have to take the eb->start into consideration.
3521 return offset_in_page(offset + eb->start);
3524 static inline unsigned long get_eb_page_index(unsigned long offset)
3527 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3529 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3530 * and have ensured that all tree blocks are contained in one page,
3531 * thus we always get index == 0.
3533 return offset >> PAGE_SHIFT;
3537 * Use that for functions that are conditionally exported for sanity tests but
3540 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3541 #define EXPORT_FOR_TESTS static
3543 #define EXPORT_FOR_TESTS
3547 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3550 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3555 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3556 unsigned int line, int errno, const char *fmt, ...);
3558 const char * __attribute_const__ btrfs_decode_error(int errno);
3561 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3562 const char *function,
3563 unsigned int line, int errno);
3566 * Call btrfs_abort_transaction as early as possible when an error condition is
3567 * detected, that way the exact line number is reported.
3569 #define btrfs_abort_transaction(trans, errno) \
3571 /* Report first abort since mount */ \
3572 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3573 &((trans)->fs_info->fs_state))) { \
3574 if ((errno) != -EIO && (errno) != -EROFS) { \
3575 WARN(1, KERN_DEBUG \
3576 "BTRFS: Transaction aborted (error %d)\n", \
3579 btrfs_debug((trans)->fs_info, \
3580 "Transaction aborted (error %d)", \
3584 __btrfs_abort_transaction((trans), __func__, \
3585 __LINE__, (errno)); \
3588 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3590 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3591 (errno), fmt, ##args); \
3594 #define BTRFS_FS_ERROR(fs_info) (unlikely(test_bit(BTRFS_FS_STATE_ERROR, \
3595 &(fs_info)->fs_state)))
3599 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3600 unsigned int line, int errno, const char *fmt, ...);
3602 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3603 * will panic(). Otherwise we BUG() here.
3605 #define btrfs_panic(fs_info, errno, fmt, args...) \
3607 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3612 /* compatibility and incompatibility defines */
3614 #define btrfs_set_fs_incompat(__fs_info, opt) \
3615 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3618 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3619 u64 flag, const char* name)
3621 struct btrfs_super_block *disk_super;
3624 disk_super = fs_info->super_copy;
3625 features = btrfs_super_incompat_flags(disk_super);
3626 if (!(features & flag)) {
3627 spin_lock(&fs_info->super_lock);
3628 features = btrfs_super_incompat_flags(disk_super);
3629 if (!(features & flag)) {
3631 btrfs_set_super_incompat_flags(disk_super, features);
3633 "setting incompat feature flag for %s (0x%llx)",
3636 spin_unlock(&fs_info->super_lock);
3640 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3641 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3644 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3645 u64 flag, const char* name)
3647 struct btrfs_super_block *disk_super;
3650 disk_super = fs_info->super_copy;
3651 features = btrfs_super_incompat_flags(disk_super);
3652 if (features & flag) {
3653 spin_lock(&fs_info->super_lock);
3654 features = btrfs_super_incompat_flags(disk_super);
3655 if (features & flag) {
3657 btrfs_set_super_incompat_flags(disk_super, features);
3659 "clearing incompat feature flag for %s (0x%llx)",
3662 spin_unlock(&fs_info->super_lock);
3666 #define btrfs_fs_incompat(fs_info, opt) \
3667 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3669 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3671 struct btrfs_super_block *disk_super;
3672 disk_super = fs_info->super_copy;
3673 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3676 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3677 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3680 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3681 u64 flag, const char *name)
3683 struct btrfs_super_block *disk_super;
3686 disk_super = fs_info->super_copy;
3687 features = btrfs_super_compat_ro_flags(disk_super);
3688 if (!(features & flag)) {
3689 spin_lock(&fs_info->super_lock);
3690 features = btrfs_super_compat_ro_flags(disk_super);
3691 if (!(features & flag)) {
3693 btrfs_set_super_compat_ro_flags(disk_super, features);
3695 "setting compat-ro feature flag for %s (0x%llx)",
3698 spin_unlock(&fs_info->super_lock);
3702 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3703 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3706 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3707 u64 flag, const char *name)
3709 struct btrfs_super_block *disk_super;
3712 disk_super = fs_info->super_copy;
3713 features = btrfs_super_compat_ro_flags(disk_super);
3714 if (features & flag) {
3715 spin_lock(&fs_info->super_lock);
3716 features = btrfs_super_compat_ro_flags(disk_super);
3717 if (features & flag) {
3719 btrfs_set_super_compat_ro_flags(disk_super, features);
3721 "clearing compat-ro feature flag for %s (0x%llx)",
3724 spin_unlock(&fs_info->super_lock);
3728 #define btrfs_fs_compat_ro(fs_info, opt) \
3729 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3731 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3733 struct btrfs_super_block *disk_super;
3734 disk_super = fs_info->super_copy;
3735 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3739 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3740 struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu);
3741 int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3742 struct posix_acl *acl, int type);
3743 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3744 struct inode *inode, struct inode *dir);
3746 #define btrfs_get_acl NULL
3747 #define btrfs_set_acl NULL
3748 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3749 struct inode *inode, struct inode *dir)
3756 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3757 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3758 struct btrfs_root *root);
3759 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3760 struct btrfs_root *root);
3761 int btrfs_recover_relocation(struct btrfs_root *root);
3762 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3763 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3764 struct btrfs_root *root, struct extent_buffer *buf,
3765 struct extent_buffer *cow);
3766 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3767 u64 *bytes_to_reserve);
3768 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3769 struct btrfs_pending_snapshot *pending);
3770 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3771 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3773 int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3776 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3777 u64 end, struct btrfs_scrub_progress *progress,
3778 int readonly, int is_dev_replace);
3779 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3780 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3781 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3782 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3783 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3784 struct btrfs_scrub_progress *progress);
3785 static inline void btrfs_init_full_stripe_locks_tree(
3786 struct btrfs_full_stripe_locks_tree *locks_root)
3788 locks_root->root = RB_ROOT;
3789 mutex_init(&locks_root->lock);
3793 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3794 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3795 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3797 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3799 btrfs_bio_counter_sub(fs_info, 1);
3802 static inline int is_fstree(u64 rootid)
3804 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3805 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3806 !btrfs_qgroup_level(rootid)))
3811 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3813 return signal_pending(current);
3817 #ifdef CONFIG_FS_VERITY
3819 extern const struct fsverity_operations btrfs_verityops;
3820 int btrfs_drop_verity_items(struct btrfs_inode *inode);
3822 BTRFS_SETGET_FUNCS(verity_descriptor_encryption, struct btrfs_verity_descriptor_item,
3824 BTRFS_SETGET_FUNCS(verity_descriptor_size, struct btrfs_verity_descriptor_item,
3826 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_encryption,
3827 struct btrfs_verity_descriptor_item, encryption, 8);
3828 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_size,
3829 struct btrfs_verity_descriptor_item, size, 64);
3833 static inline int btrfs_drop_verity_items(struct btrfs_inode *inode)
3840 /* Sanity test specific functions */
3841 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3842 void btrfs_test_destroy_inode(struct inode *inode);
3843 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3845 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3848 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3854 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
3856 return fs_info->zoned != 0;
3859 static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root)
3861 return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;
3865 * We use page status Private2 to indicate there is an ordered extent with
3868 * Rename the Private2 accessors to Ordered, to improve readability.
3870 #define PageOrdered(page) PagePrivate2(page)
3871 #define SetPageOrdered(page) SetPagePrivate2(page)
3872 #define ClearPageOrdered(page) ClearPagePrivate2(page)