1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2007 Oracle. All rights reserved.
10 #include <linux/sched/signal.h>
11 #include <linux/highmem.h>
13 #include <linux/rwsem.h>
14 #include <linux/semaphore.h>
15 #include <linux/completion.h>
16 #include <linux/backing-dev.h>
17 #include <linux/wait.h>
18 #include <linux/slab.h>
19 #include <trace/events/btrfs.h>
20 #include <asm/unaligned.h>
21 #include <linux/pagemap.h>
22 #include <linux/btrfs.h>
23 #include <linux/btrfs_tree.h>
24 #include <linux/workqueue.h>
25 #include <linux/security.h>
26 #include <linux/sizes.h>
27 #include <linux/dynamic_debug.h>
28 #include <linux/refcount.h>
29 #include <linux/crc32c.h>
30 #include <linux/iomap.h>
31 #include "extent-io-tree.h"
32 #include "extent_io.h"
33 #include "extent_map.h"
34 #include "async-thread.h"
35 #include "block-rsv.h"
38 struct btrfs_trans_handle;
39 struct btrfs_transaction;
40 struct btrfs_pending_snapshot;
41 struct btrfs_delayed_ref_root;
42 struct btrfs_space_info;
43 struct btrfs_block_group;
44 extern struct kmem_cache *btrfs_trans_handle_cachep;
45 extern struct kmem_cache *btrfs_bit_radix_cachep;
46 extern struct kmem_cache *btrfs_path_cachep;
47 extern struct kmem_cache *btrfs_free_space_cachep;
48 extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
49 struct btrfs_ordered_sum;
52 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
55 * Maximum number of mirrors that can be available for all profiles counting
56 * the target device of dev-replace as one. During an active device replace
57 * procedure, the target device of the copy operation is a mirror for the
58 * filesystem data as well that can be used to read data in order to repair
59 * read errors on other disks.
61 * Current value is derived from RAID1C4 with 4 copies.
63 #define BTRFS_MAX_MIRRORS (4 + 1)
65 #define BTRFS_MAX_LEVEL 8
67 #define BTRFS_OLDEST_GENERATION 0ULL
70 * we can actually store much bigger names, but lets not confuse the rest
73 #define BTRFS_NAME_LEN 255
76 * Theoretical limit is larger, but we keep this down to a sane
77 * value. That should limit greatly the possibility of collisions on
80 #define BTRFS_LINK_MAX 65535U
82 #define BTRFS_EMPTY_DIR_SIZE 0
84 /* ioprio of readahead is set to idle */
85 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
87 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M
90 * Use large batch size to reduce overhead of metadata updates. On the reader
91 * side, we only read it when we are close to ENOSPC and the read overhead is
92 * mostly related to the number of CPUs, so it is OK to use arbitrary large
95 #define BTRFS_TOTAL_BYTES_PINNED_BATCH SZ_128M
97 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
100 * Deltas are an effective way to populate global statistics. Give macro names
101 * to make it clear what we're doing. An example is discard_extents in
102 * btrfs_free_space_ctl.
104 #define BTRFS_STAT_NR_ENTRIES 2
105 #define BTRFS_STAT_CURR 0
106 #define BTRFS_STAT_PREV 1
109 * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
111 static inline u32 count_max_extents(u64 size)
113 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
116 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
118 BUG_ON(num_stripes == 0);
119 return sizeof(struct btrfs_chunk) +
120 sizeof(struct btrfs_stripe) * (num_stripes - 1);
124 * Runtime (in-memory) states of filesystem
127 /* Global indicator of serious filesystem errors */
128 BTRFS_FS_STATE_ERROR,
130 * Filesystem is being remounted, allow to skip some operations, like
133 BTRFS_FS_STATE_REMOUNTING,
134 /* Filesystem in RO mode */
136 /* Track if a transaction abort has been reported on this filesystem */
137 BTRFS_FS_STATE_TRANS_ABORTED,
139 * Bio operations should be blocked on this filesystem because a source
140 * or target device is being destroyed as part of a device replace
142 BTRFS_FS_STATE_DEV_REPLACING,
143 /* The btrfs_fs_info created for self-tests */
144 BTRFS_FS_STATE_DUMMY_FS_INFO,
146 /* Indicates there was an error cleaning up a log tree. */
147 BTRFS_FS_STATE_LOG_CLEANUP_ERROR,
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__));
224 * the super block basically lists the main trees of the FS
225 * it currently lacks any block count etc etc
227 struct btrfs_super_block {
228 /* the first 4 fields must match struct btrfs_header */
229 u8 csum[BTRFS_CSUM_SIZE];
230 /* FS specific UUID, visible to user */
231 u8 fsid[BTRFS_FSID_SIZE];
232 __le64 bytenr; /* this block number */
235 /* allowed to be different from the btrfs_header from here own down */
242 /* this will help find the new super based on the log root */
243 __le64 log_root_transid;
246 __le64 root_dir_objectid;
250 __le32 __unused_leafsize;
252 __le32 sys_chunk_array_size;
253 __le64 chunk_root_generation;
255 __le64 compat_ro_flags;
256 __le64 incompat_flags;
261 struct btrfs_dev_item dev_item;
263 char label[BTRFS_LABEL_SIZE];
265 __le64 cache_generation;
266 __le64 uuid_tree_generation;
268 /* the UUID written into btree blocks */
269 u8 metadata_uuid[BTRFS_FSID_SIZE];
271 /* future expansion */
273 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
274 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
275 } __attribute__ ((__packed__));
278 * Compat flags that we support. If any incompat flags are set other than the
279 * ones specified below then we will fail to mount
281 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
282 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
283 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
285 #define BTRFS_FEATURE_COMPAT_RO_SUPP \
286 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
287 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
288 BTRFS_FEATURE_COMPAT_RO_VERITY)
290 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
291 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
293 #define BTRFS_FEATURE_INCOMPAT_SUPP \
294 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
295 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
296 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
297 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
298 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
299 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
300 BTRFS_FEATURE_INCOMPAT_RAID56 | \
301 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
302 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
303 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
304 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
305 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
306 BTRFS_FEATURE_INCOMPAT_ZONED)
308 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
309 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
310 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
313 * A leaf is full of items. offset and size tell us where to find
314 * the item in the leaf (relative to the start of the data area)
317 struct btrfs_disk_key key;
320 } __attribute__ ((__packed__));
323 * leaves have an item area and a data area:
324 * [item0, item1....itemN] [free space] [dataN...data1, data0]
326 * The data is separate from the items to get the keys closer together
330 struct btrfs_header header;
331 struct btrfs_item items[];
332 } __attribute__ ((__packed__));
335 * all non-leaf blocks are nodes, they hold only keys and pointers to
338 struct btrfs_key_ptr {
339 struct btrfs_disk_key key;
342 } __attribute__ ((__packed__));
345 struct btrfs_header header;
346 struct btrfs_key_ptr ptrs[];
347 } __attribute__ ((__packed__));
349 /* Read ahead values for struct btrfs_path.reada */
355 * Similar to READA_FORWARD but unlike it:
357 * 1) It will trigger readahead even for leaves that are not close to
358 * each other on disk;
359 * 2) It also triggers readahead for nodes;
360 * 3) During a search, even when a node or leaf is already in memory, it
361 * will still trigger readahead for other nodes and leaves that follow
364 * This is meant to be used only when we know we are iterating over the
365 * entire tree or a very large part of it.
367 READA_FORWARD_ALWAYS,
371 * btrfs_paths remember the path taken from the root down to the leaf.
372 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
373 * to any other levels that are present.
375 * The slots array records the index of the item or block pointer
376 * used while walking the tree.
379 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
380 int slots[BTRFS_MAX_LEVEL];
381 /* if there is real range locking, this locks field will change */
382 u8 locks[BTRFS_MAX_LEVEL];
384 /* keep some upper locks as we walk down */
388 * set by btrfs_split_item, tells search_slot to keep all locks
389 * and to force calls to keep space in the nodes
391 unsigned int search_for_split:1;
392 unsigned int keep_locks:1;
393 unsigned int skip_locking:1;
394 unsigned int search_commit_root:1;
395 unsigned int need_commit_sem:1;
396 unsigned int skip_release_on_error:1;
398 * Indicate that new item (btrfs_search_slot) is extending already
399 * existing item and ins_len contains only the data size and not item
400 * header (ie. sizeof(struct btrfs_item) is not included).
402 unsigned int search_for_extension:1;
404 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
405 sizeof(struct btrfs_item))
406 struct btrfs_dev_replace {
407 u64 replace_state; /* see #define above */
408 time64_t time_started; /* seconds since 1-Jan-1970 */
409 time64_t time_stopped; /* seconds since 1-Jan-1970 */
410 atomic64_t num_write_errors;
411 atomic64_t num_uncorrectable_read_errors;
414 u64 committed_cursor_left;
415 u64 cursor_left_last_write_of_item;
418 u64 cont_reading_from_srcdev_mode; /* see #define above */
421 int item_needs_writeback;
422 struct btrfs_device *srcdev;
423 struct btrfs_device *tgtdev;
425 struct mutex lock_finishing_cancel_unmount;
426 struct rw_semaphore rwsem;
428 struct btrfs_scrub_progress scrub_progress;
430 struct percpu_counter bio_counter;
431 wait_queue_head_t replace_wait;
435 * free clusters are used to claim free space in relatively large chunks,
436 * allowing us to do less seeky writes. They are used for all metadata
437 * allocations. In ssd_spread mode they are also used for data allocations.
439 struct btrfs_free_cluster {
441 spinlock_t refill_lock;
444 /* largest extent in this cluster */
447 /* first extent starting offset */
450 /* We did a full search and couldn't create a cluster */
453 struct btrfs_block_group *block_group;
455 * when a cluster is allocated from a block group, we put the
456 * cluster onto a list in the block group so that it can
457 * be freed before the block group is freed.
459 struct list_head block_group_list;
462 enum btrfs_caching_type {
466 BTRFS_CACHE_FINISHED,
471 * Tree to record all locked full stripes of a RAID5/6 block group
473 struct btrfs_full_stripe_locks_tree {
478 /* Discard control. */
480 * Async discard uses multiple lists to differentiate the discard filter
481 * parameters. Index 0 is for completely free block groups where we need to
482 * ensure the entire block group is trimmed without being lossy. Indices
483 * afterwards represent monotonically decreasing discard filter sizes to
484 * prioritize what should be discarded next.
486 #define BTRFS_NR_DISCARD_LISTS 3
487 #define BTRFS_DISCARD_INDEX_UNUSED 0
488 #define BTRFS_DISCARD_INDEX_START 1
490 struct btrfs_discard_ctl {
491 struct workqueue_struct *discard_workers;
492 struct delayed_work work;
494 struct btrfs_block_group *block_group;
495 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
497 u64 prev_discard_time;
498 atomic_t discardable_extents;
499 atomic64_t discardable_bytes;
500 u64 max_discard_size;
504 u64 discard_extent_bytes;
505 u64 discard_bitmap_bytes;
506 atomic64_t discard_bytes_saved;
509 enum btrfs_orphan_cleanup_state {
510 ORPHAN_CLEANUP_STARTED = 1,
511 ORPHAN_CLEANUP_DONE = 2,
514 void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
517 struct reloc_control;
519 struct btrfs_fs_devices;
520 struct btrfs_balance_control;
521 struct btrfs_delayed_root;
524 * Block group or device which contains an active swapfile. Used for preventing
525 * unsafe operations while a swapfile is active.
527 * These are sorted on (ptr, inode) (note that a block group or device can
528 * contain more than one swapfile). We compare the pointer values because we
529 * don't actually care what the object is, we just need a quick check whether
530 * the object exists in the rbtree.
532 struct btrfs_swapfile_pin {
537 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
538 * points to a struct btrfs_device.
542 * Only used when 'is_block_group' is true and it is the number of
543 * extents used by a swapfile for this block group ('ptr' field).
548 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
552 BTRFS_FS_CLOSING_START,
553 BTRFS_FS_CLOSING_DONE,
554 BTRFS_FS_LOG_RECOVERING,
556 BTRFS_FS_QUOTA_ENABLED,
557 BTRFS_FS_UPDATE_UUID_TREE_GEN,
558 BTRFS_FS_CREATING_FREE_SPACE_TREE,
562 BTRFS_FS_QUOTA_OVERRIDE,
563 /* Used to record internally whether fs has been frozen */
566 * Indicate that balance has been set up from the ioctl and is in the
567 * main phase. The fs_info::balance_ctl is initialized.
569 BTRFS_FS_BALANCE_RUNNING,
572 * Indicate that relocation of a chunk has started, it's set per chunk
573 * and is toggled between chunks.
575 BTRFS_FS_RELOC_RUNNING,
577 /* Indicate that the cleaner thread is awake and doing something. */
578 BTRFS_FS_CLEANER_RUNNING,
581 * The checksumming has an optimized version and is considered fast,
582 * so we don't need to offload checksums to workqueues.
584 BTRFS_FS_CSUM_IMPL_FAST,
586 /* Indicate that the discard workqueue can service discards. */
587 BTRFS_FS_DISCARD_RUNNING,
589 /* Indicate that we need to cleanup space cache v1 */
590 BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
592 /* Indicate that we can't trust the free space tree for caching yet */
593 BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
595 /* Indicate whether there are any tree modification log users */
596 BTRFS_FS_TREE_MOD_LOG_USERS,
598 /* Indicate we have half completed snapshot deletions pending. */
599 BTRFS_FS_UNFINISHED_DROPS,
601 #if BITS_PER_LONG == 32
602 /* Indicate if we have error/warn message printed on 32bit systems */
603 BTRFS_FS_32BIT_ERROR,
609 * Exclusive operations (device replace, resize, device add/remove, balance)
611 enum btrfs_exclusive_operation {
613 BTRFS_EXCLOP_BALANCE,
614 BTRFS_EXCLOP_DEV_ADD,
615 BTRFS_EXCLOP_DEV_REMOVE,
616 BTRFS_EXCLOP_DEV_REPLACE,
618 BTRFS_EXCLOP_SWAP_ACTIVATE,
621 struct btrfs_fs_info {
622 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
624 struct btrfs_root *extent_root;
625 struct btrfs_root *tree_root;
626 struct btrfs_root *chunk_root;
627 struct btrfs_root *dev_root;
628 struct btrfs_root *fs_root;
629 struct btrfs_root *csum_root;
630 struct btrfs_root *quota_root;
631 struct btrfs_root *uuid_root;
632 struct btrfs_root *free_space_root;
633 struct btrfs_root *data_reloc_root;
635 /* the log root tree is a directory of all the other log roots */
636 struct btrfs_root *log_root_tree;
638 spinlock_t fs_roots_radix_lock;
639 struct radix_tree_root fs_roots_radix;
641 /* block group cache stuff */
642 spinlock_t block_group_cache_lock;
643 u64 first_logical_byte;
644 struct rb_root block_group_cache_tree;
646 /* keep track of unallocated space */
647 atomic64_t free_chunk_space;
649 /* Track ranges which are used by log trees blocks/logged data extents */
650 struct extent_io_tree excluded_extents;
652 /* logical->physical extent mapping */
653 struct extent_map_tree mapping_tree;
656 * block reservation for extent, checksum, root tree and
657 * delayed dir index item
659 struct btrfs_block_rsv global_block_rsv;
660 /* block reservation for metadata operations */
661 struct btrfs_block_rsv trans_block_rsv;
662 /* block reservation for chunk tree */
663 struct btrfs_block_rsv chunk_block_rsv;
664 /* block reservation for delayed operations */
665 struct btrfs_block_rsv delayed_block_rsv;
666 /* block reservation for delayed refs */
667 struct btrfs_block_rsv delayed_refs_rsv;
669 struct btrfs_block_rsv empty_block_rsv;
672 u64 last_trans_committed;
674 * Generation of the last transaction used for block group relocation
675 * since the filesystem was last mounted (or 0 if none happened yet).
676 * Must be written and read while holding btrfs_fs_info::commit_root_sem.
678 u64 last_reloc_trans;
679 u64 avg_delayed_ref_runtime;
682 * this is updated to the current trans every time a full commit
683 * is required instead of the faster short fsync log commits
685 u64 last_trans_log_full_commit;
686 unsigned long mount_opt;
688 * Track requests for actions that need to be done during transaction
689 * commit (like for some mount options).
691 unsigned long pending_changes;
692 unsigned long compress_type:4;
693 unsigned int compress_level;
696 * It is a suggestive number, the read side is safe even it gets a
697 * wrong number because we will write out the data into a regular
698 * extent. The write side(mount/remount) is under ->s_umount lock,
699 * so it is also safe.
703 struct btrfs_transaction *running_transaction;
704 wait_queue_head_t transaction_throttle;
705 wait_queue_head_t transaction_wait;
706 wait_queue_head_t transaction_blocked_wait;
707 wait_queue_head_t async_submit_wait;
710 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
711 * when they are updated.
713 * Because we do not clear the flags for ever, so we needn't use
714 * the lock on the read side.
716 * We also needn't use the lock when we mount the fs, because
717 * there is no other task which will update the flag.
719 spinlock_t super_lock;
720 struct btrfs_super_block *super_copy;
721 struct btrfs_super_block *super_for_commit;
722 struct super_block *sb;
723 struct inode *btree_inode;
724 struct mutex tree_log_mutex;
725 struct mutex transaction_kthread_mutex;
726 struct mutex cleaner_mutex;
727 struct mutex chunk_mutex;
730 * this is taken to make sure we don't set block groups ro after
731 * the free space cache has been allocated on them
733 struct mutex ro_block_group_mutex;
735 /* this is used during read/modify/write to make sure
736 * no two ios are trying to mod the same stripe at the same
739 struct btrfs_stripe_hash_table *stripe_hash_table;
742 * this protects the ordered operations list only while we are
743 * processing all of the entries on it. This way we make
744 * sure the commit code doesn't find the list temporarily empty
745 * because another function happens to be doing non-waiting preflush
746 * before jumping into the main commit.
748 struct mutex ordered_operations_mutex;
750 struct rw_semaphore commit_root_sem;
752 struct rw_semaphore cleanup_work_sem;
754 struct rw_semaphore subvol_sem;
756 spinlock_t trans_lock;
758 * the reloc mutex goes with the trans lock, it is taken
759 * during commit to protect us from the relocation code
761 struct mutex reloc_mutex;
763 struct list_head trans_list;
764 struct list_head dead_roots;
765 struct list_head caching_block_groups;
767 spinlock_t delayed_iput_lock;
768 struct list_head delayed_iputs;
769 atomic_t nr_delayed_iputs;
770 wait_queue_head_t delayed_iputs_wait;
772 atomic64_t tree_mod_seq;
774 /* this protects tree_mod_log and tree_mod_seq_list */
775 rwlock_t tree_mod_log_lock;
776 struct rb_root tree_mod_log;
777 struct list_head tree_mod_seq_list;
779 atomic_t async_delalloc_pages;
782 * this is used to protect the following list -- ordered_roots.
784 spinlock_t ordered_root_lock;
787 * all fs/file tree roots in which there are data=ordered extents
788 * pending writeback are added into this list.
790 * these can span multiple transactions and basically include
791 * every dirty data page that isn't from nodatacow
793 struct list_head ordered_roots;
795 struct mutex delalloc_root_mutex;
796 spinlock_t delalloc_root_lock;
797 /* all fs/file tree roots that have delalloc inodes. */
798 struct list_head delalloc_roots;
801 * there is a pool of worker threads for checksumming during writes
802 * and a pool for checksumming after reads. This is because readers
803 * can run with FS locks held, and the writers may be waiting for
804 * those locks. We don't want ordering in the pending list to cause
805 * deadlocks, and so the two are serviced separately.
807 * A third pool does submit_bio to avoid deadlocking with the other
810 struct btrfs_workqueue *workers;
811 struct btrfs_workqueue *delalloc_workers;
812 struct btrfs_workqueue *flush_workers;
813 struct btrfs_workqueue *endio_workers;
814 struct btrfs_workqueue *endio_meta_workers;
815 struct btrfs_workqueue *endio_raid56_workers;
816 struct btrfs_workqueue *rmw_workers;
817 struct btrfs_workqueue *endio_meta_write_workers;
818 struct btrfs_workqueue *endio_write_workers;
819 struct btrfs_workqueue *endio_freespace_worker;
820 struct btrfs_workqueue *caching_workers;
821 struct btrfs_workqueue *readahead_workers;
824 * fixup workers take dirty pages that didn't properly go through
825 * the cow mechanism and make them safe to write. It happens
826 * for the sys_munmap function call path
828 struct btrfs_workqueue *fixup_workers;
829 struct btrfs_workqueue *delayed_workers;
831 struct task_struct *transaction_kthread;
832 struct task_struct *cleaner_kthread;
833 u32 thread_pool_size;
835 struct kobject *space_info_kobj;
836 struct kobject *qgroups_kobj;
838 /* used to keep from writing metadata until there is a nice batch */
839 struct percpu_counter dirty_metadata_bytes;
840 struct percpu_counter delalloc_bytes;
841 struct percpu_counter ordered_bytes;
842 s32 dirty_metadata_batch;
845 struct list_head dirty_cowonly_roots;
847 struct btrfs_fs_devices *fs_devices;
850 * The space_info list is effectively read only after initial
851 * setup. It is populated at mount time and cleaned up after
852 * all block groups are removed. RCU is used to protect it.
854 struct list_head space_info;
856 struct btrfs_space_info *data_sinfo;
858 struct reloc_control *reloc_ctl;
860 /* data_alloc_cluster is only used in ssd_spread mode */
861 struct btrfs_free_cluster data_alloc_cluster;
863 /* all metadata allocations go through this cluster */
864 struct btrfs_free_cluster meta_alloc_cluster;
866 /* auto defrag inodes go here */
867 spinlock_t defrag_inodes_lock;
868 struct rb_root defrag_inodes;
869 atomic_t defrag_running;
871 /* Used to protect avail_{data, metadata, system}_alloc_bits */
872 seqlock_t profiles_lock;
874 * these three are in extended format (availability of single
875 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
876 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
878 u64 avail_data_alloc_bits;
879 u64 avail_metadata_alloc_bits;
880 u64 avail_system_alloc_bits;
882 /* restriper state */
883 spinlock_t balance_lock;
884 struct mutex balance_mutex;
885 atomic_t balance_pause_req;
886 atomic_t balance_cancel_req;
887 struct btrfs_balance_control *balance_ctl;
888 wait_queue_head_t balance_wait_q;
890 /* Cancellation requests for chunk relocation */
891 atomic_t reloc_cancel_req;
893 u32 data_chunk_allocations;
898 /* private scrub information */
899 struct mutex scrub_lock;
900 atomic_t scrubs_running;
901 atomic_t scrub_pause_req;
902 atomic_t scrubs_paused;
903 atomic_t scrub_cancel_req;
904 wait_queue_head_t scrub_pause_wait;
906 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
909 refcount_t scrub_workers_refcnt;
910 struct btrfs_workqueue *scrub_workers;
911 struct btrfs_workqueue *scrub_wr_completion_workers;
912 struct btrfs_workqueue *scrub_parity_workers;
914 struct btrfs_discard_ctl discard_ctl;
916 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
917 u32 check_integrity_print_mask;
919 /* is qgroup tracking in a consistent state? */
922 /* holds configuration and tracking. Protected by qgroup_lock */
923 struct rb_root qgroup_tree;
924 spinlock_t qgroup_lock;
927 * used to avoid frequently calling ulist_alloc()/ulist_free()
928 * when doing qgroup accounting, it must be protected by qgroup_lock.
930 struct ulist *qgroup_ulist;
933 * Protect user change for quota operations. If a transaction is needed,
934 * it must be started before locking this lock.
936 struct mutex qgroup_ioctl_lock;
938 /* list of dirty qgroups to be written at next commit */
939 struct list_head dirty_qgroups;
941 /* used by qgroup for an efficient tree traversal */
944 /* qgroup rescan items */
945 struct mutex qgroup_rescan_lock; /* protects the progress item */
946 struct btrfs_key qgroup_rescan_progress;
947 struct btrfs_workqueue *qgroup_rescan_workers;
948 struct completion qgroup_rescan_completion;
949 struct btrfs_work qgroup_rescan_work;
950 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */
952 /* filesystem state */
953 unsigned long fs_state;
955 struct btrfs_delayed_root *delayed_root;
958 spinlock_t reada_lock;
959 struct radix_tree_root reada_tree;
961 /* readahead works cnt */
962 atomic_t reada_works_cnt;
964 /* Extent buffer radix tree */
965 spinlock_t buffer_lock;
966 /* Entries are eb->start / sectorsize */
967 struct radix_tree_root buffer_radix;
969 /* next backup root to be overwritten */
970 int backup_root_index;
972 /* device replace state */
973 struct btrfs_dev_replace dev_replace;
975 struct semaphore uuid_tree_rescan_sem;
977 /* Used to reclaim the metadata space in the background. */
978 struct work_struct async_reclaim_work;
979 struct work_struct async_data_reclaim_work;
980 struct work_struct preempt_reclaim_work;
982 /* Reclaim partially filled block groups in the background */
983 struct work_struct reclaim_bgs_work;
984 struct list_head reclaim_bgs;
985 int bg_reclaim_threshold;
987 spinlock_t unused_bgs_lock;
988 struct list_head unused_bgs;
989 struct mutex unused_bg_unpin_mutex;
990 /* Protect block groups that are going to be deleted */
991 struct mutex reclaim_bgs_lock;
993 /* Cached block sizes */
996 /* ilog2 of sectorsize, use to avoid 64bit division */
1002 /* Block groups and devices containing active swapfiles. */
1003 spinlock_t swapfile_pins_lock;
1004 struct rb_root swapfile_pins;
1006 struct crypto_shash *csum_shash;
1008 /* Type of exclusive operation running, protected by super_lock */
1009 enum btrfs_exclusive_operation exclusive_operation;
1012 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1013 * if the mode is enabled
1020 struct mutex zoned_meta_io_lock;
1021 spinlock_t treelog_bg_lock;
1025 * Start of the dedicated data relocation block group, protected by
1026 * relocation_bg_lock.
1028 spinlock_t relocation_bg_lock;
1031 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1032 spinlock_t ref_verify_lock;
1033 struct rb_root block_tree;
1036 #ifdef CONFIG_BTRFS_DEBUG
1037 struct kobject *debug_kobj;
1038 struct kobject *discard_debug_kobj;
1039 struct list_head allocated_roots;
1041 spinlock_t eb_leak_lock;
1042 struct list_head allocated_ebs;
1046 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1048 return sb->s_fs_info;
1052 * The state of btrfs root
1056 * btrfs_record_root_in_trans is a multi-step process, and it can race
1057 * with the balancing code. But the race is very small, and only the
1058 * first time the root is added to each transaction. So IN_TRANS_SETUP
1059 * is used to tell us when more checks are required
1061 BTRFS_ROOT_IN_TRANS_SETUP,
1064 * Set if tree blocks of this root can be shared by other roots.
1065 * Only subvolume trees and their reloc trees have this bit set.
1066 * Conflicts with TRACK_DIRTY bit.
1068 * This affects two things:
1070 * - How balance works
1071 * For shareable roots, we need to use reloc tree and do path
1072 * replacement for balance, and need various pre/post hooks for
1073 * snapshot creation to handle them.
1075 * While for non-shareable trees, we just simply do a tree search
1078 * - How dirty roots are tracked
1079 * For shareable roots, btrfs_record_root_in_trans() is needed to
1080 * track them, while non-subvolume roots have TRACK_DIRTY bit, they
1081 * don't need to set this manually.
1083 BTRFS_ROOT_SHAREABLE,
1084 BTRFS_ROOT_TRACK_DIRTY,
1085 BTRFS_ROOT_IN_RADIX,
1086 BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1087 BTRFS_ROOT_DEFRAG_RUNNING,
1088 BTRFS_ROOT_FORCE_COW,
1089 BTRFS_ROOT_MULTI_LOG_TASKS,
1091 BTRFS_ROOT_DELETING,
1094 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1096 * Set for the subvolume tree owning the reloc tree.
1098 BTRFS_ROOT_DEAD_RELOC_TREE,
1099 /* Mark dead root stored on device whose cleanup needs to be resumed */
1100 BTRFS_ROOT_DEAD_TREE,
1101 /* The root has a log tree. Used for subvolume roots and the tree root. */
1102 BTRFS_ROOT_HAS_LOG_TREE,
1103 /* Qgroup flushing is in progress */
1104 BTRFS_ROOT_QGROUP_FLUSHING,
1105 /* This root has a drop operation that was started previously. */
1106 BTRFS_ROOT_UNFINISHED_DROP,
1109 static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
1111 clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags);
1115 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1116 * code. For detail check comment in fs/btrfs/qgroup.c.
1118 struct btrfs_qgroup_swapped_blocks {
1120 /* RM_EMPTY_ROOT() of above blocks[] */
1122 struct rb_root blocks[BTRFS_MAX_LEVEL];
1126 * in ram representation of the tree. extent_root is used for all allocations
1127 * and for the extent tree extent_root root.
1130 struct extent_buffer *node;
1132 struct extent_buffer *commit_root;
1133 struct btrfs_root *log_root;
1134 struct btrfs_root *reloc_root;
1136 unsigned long state;
1137 struct btrfs_root_item root_item;
1138 struct btrfs_key root_key;
1139 struct btrfs_fs_info *fs_info;
1140 struct extent_io_tree dirty_log_pages;
1142 struct mutex objectid_mutex;
1144 spinlock_t accounting_lock;
1145 struct btrfs_block_rsv *block_rsv;
1147 struct mutex log_mutex;
1148 wait_queue_head_t log_writer_wait;
1149 wait_queue_head_t log_commit_wait[2];
1150 struct list_head log_ctxs[2];
1151 /* Used only for log trees of subvolumes, not for the log root tree */
1152 atomic_t log_writers;
1153 atomic_t log_commit[2];
1154 /* Used only for log trees of subvolumes, not for the log root tree */
1157 /* No matter the commit succeeds or not*/
1158 int log_transid_committed;
1159 /* Just be updated when the commit succeeds. */
1160 int last_log_commit;
1161 pid_t log_start_pid;
1169 struct btrfs_key defrag_progress;
1170 struct btrfs_key defrag_max;
1172 /* The dirty list is only used by non-shareable roots */
1173 struct list_head dirty_list;
1175 struct list_head root_list;
1177 spinlock_t log_extents_lock[2];
1178 struct list_head logged_list[2];
1180 int orphan_cleanup_state;
1182 spinlock_t inode_lock;
1183 /* red-black tree that keeps track of in-memory inodes */
1184 struct rb_root inode_tree;
1187 * radix tree that keeps track of delayed nodes of every inode,
1188 * protected by inode_lock
1190 struct radix_tree_root delayed_nodes_tree;
1192 * right now this just gets used so that a root has its own devid
1193 * for stat. It may be used for more later
1197 spinlock_t root_item_lock;
1200 struct mutex delalloc_mutex;
1201 spinlock_t delalloc_lock;
1203 * all of the inodes that have delalloc bytes. It is possible for
1204 * this list to be empty even when there is still dirty data=ordered
1205 * extents waiting to finish IO.
1207 struct list_head delalloc_inodes;
1208 struct list_head delalloc_root;
1209 u64 nr_delalloc_inodes;
1211 struct mutex ordered_extent_mutex;
1213 * this is used by the balancing code to wait for all the pending
1216 spinlock_t ordered_extent_lock;
1219 * all of the data=ordered extents pending writeback
1220 * these can span multiple transactions and basically include
1221 * every dirty data page that isn't from nodatacow
1223 struct list_head ordered_extents;
1224 struct list_head ordered_root;
1225 u64 nr_ordered_extents;
1228 * Not empty if this subvolume root has gone through tree block swap
1231 * Will be used by reloc_control::dirty_subvol_roots.
1233 struct list_head reloc_dirty_list;
1236 * Number of currently running SEND ioctls to prevent
1237 * manipulation with the read-only status via SUBVOL_SETFLAGS
1239 int send_in_progress;
1241 * Number of currently running deduplication operations that have a
1242 * destination inode belonging to this root. Protected by the lock
1245 int dedupe_in_progress;
1246 /* For exclusion of snapshot creation and nocow writes */
1247 struct btrfs_drew_lock snapshot_lock;
1249 atomic_t snapshot_force_cow;
1251 /* For qgroup metadata reserved space */
1252 spinlock_t qgroup_meta_rsv_lock;
1253 u64 qgroup_meta_rsv_pertrans;
1254 u64 qgroup_meta_rsv_prealloc;
1255 wait_queue_head_t qgroup_flush_wait;
1257 /* Number of active swapfiles */
1258 atomic_t nr_swapfiles;
1260 /* Record pairs of swapped blocks for qgroup */
1261 struct btrfs_qgroup_swapped_blocks swapped_blocks;
1263 /* Used only by log trees, when logging csum items */
1264 struct extent_io_tree log_csum_range;
1266 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1270 #ifdef CONFIG_BTRFS_DEBUG
1271 struct list_head leak_list;
1276 * Structure that conveys information about an extent that is going to replace
1277 * all the extents in a file range.
1279 struct btrfs_replace_extent_info {
1285 /* Pointer to a file extent item of type regular or prealloc. */
1288 * Set to true when attempting to replace a file range with a new extent
1289 * described by this structure, set to false when attempting to clone an
1290 * existing extent into a file range.
1293 /* Meaningful only if is_new_extent is true. */
1294 int qgroup_reserved;
1296 * Meaningful only if is_new_extent is true.
1297 * Used to track how many extent items we have already inserted in a
1298 * subvolume tree that refer to the extent described by this structure,
1299 * so that we know when to create a new delayed ref or update an existing
1305 /* Arguments for btrfs_drop_extents() */
1306 struct btrfs_drop_extents_args {
1307 /* Input parameters */
1310 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1311 * If 'replace_extent' is true, this must not be NULL. Also the path
1312 * is always released except if 'replace_extent' is true and
1313 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1314 * the path is kept locked.
1316 struct btrfs_path *path;
1317 /* Start offset of the range to drop extents from */
1319 /* End (exclusive, last byte + 1) of the range to drop extents from */
1321 /* If true drop all the extent maps in the range */
1324 * If true it means we want to insert a new extent after dropping all
1325 * the extents in the range. If this is true, the 'extent_item_size'
1326 * parameter must be set as well and the 'extent_inserted' field will
1327 * be set to true by btrfs_drop_extents() if it could insert the new
1329 * Note: when this is set to true the path must not be NULL.
1331 bool replace_extent;
1333 * Used if 'replace_extent' is true. Size of the file extent item to
1334 * insert after dropping all existing extents in the range
1336 u32 extent_item_size;
1338 /* Output parameters */
1341 * Set to the minimum between the input parameter 'end' and the end
1342 * (exclusive, last byte + 1) of the last dropped extent. This is always
1343 * set even if btrfs_drop_extents() returns an error.
1347 * The number of allocated bytes found in the range. This can be smaller
1348 * than the range's length when there are holes in the range.
1352 * Only set if 'replace_extent' is true. Set to true if we were able
1353 * to insert a replacement extent after dropping all extents in the
1354 * range, otherwise set to false by btrfs_drop_extents().
1355 * Also, if btrfs_drop_extents() has set this to true it means it
1356 * returned with the path locked, otherwise if it has set this to
1357 * false it has returned with the path released.
1359 bool extent_inserted;
1362 struct btrfs_file_private {
1367 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1370 return info->nodesize - sizeof(struct btrfs_header);
1373 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items)
1375 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1377 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1380 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1382 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1385 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1386 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1387 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1389 return BTRFS_MAX_ITEM_SIZE(info) -
1390 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1393 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1395 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1399 * Flags for mount options.
1401 * Note: don't forget to add new options to btrfs_show_options()
1404 BTRFS_MOUNT_NODATASUM = (1UL << 0),
1405 BTRFS_MOUNT_NODATACOW = (1UL << 1),
1406 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
1407 BTRFS_MOUNT_SSD = (1UL << 3),
1408 BTRFS_MOUNT_DEGRADED = (1UL << 4),
1409 BTRFS_MOUNT_COMPRESS = (1UL << 5),
1410 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
1411 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
1412 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
1413 BTRFS_MOUNT_NOSSD = (1UL << 9),
1414 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
1415 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
1416 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
1417 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
1418 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
1419 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
1420 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
1421 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
1422 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
1423 BTRFS_MOUNT_CHECK_INTEGRITY = (1UL << 19),
1424 BTRFS_MOUNT_CHECK_INTEGRITY_DATA = (1UL << 20),
1425 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 21),
1426 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 22),
1427 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 23),
1428 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 24),
1429 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 25),
1430 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 26),
1431 BTRFS_MOUNT_REF_VERIFY = (1UL << 27),
1432 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 28),
1433 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 29),
1434 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 30),
1437 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1438 #define BTRFS_DEFAULT_MAX_INLINE (2048)
1440 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1441 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1442 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1443 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1446 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1448 if (!btrfs_test_opt(fs_info, opt)) \
1449 btrfs_info(fs_info, fmt, ##args); \
1450 btrfs_set_opt(fs_info->mount_opt, opt); \
1453 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1455 if (btrfs_test_opt(fs_info, opt)) \
1456 btrfs_info(fs_info, fmt, ##args); \
1457 btrfs_clear_opt(fs_info->mount_opt, opt); \
1461 * Requests for changes that need to be done during transaction commit.
1463 * Internal mount options that are used for special handling of the real
1464 * mount options (eg. cannot be set during remount and have to be set during
1465 * transaction commit)
1468 #define BTRFS_PENDING_COMMIT (0)
1470 #define btrfs_test_pending(info, opt) \
1471 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1472 #define btrfs_set_pending(info, opt) \
1473 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1474 #define btrfs_clear_pending(info, opt) \
1475 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1478 * Helpers for setting pending mount option changes.
1480 * Expects corresponding macros
1481 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1483 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1485 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1486 btrfs_info((info), fmt, ##args); \
1487 btrfs_set_pending((info), SET_##opt); \
1488 btrfs_clear_pending((info), CLEAR_##opt); \
1492 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1494 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1495 btrfs_info((info), fmt, ##args); \
1496 btrfs_set_pending((info), CLEAR_##opt); \
1497 btrfs_clear_pending((info), SET_##opt); \
1504 #define BTRFS_INODE_NODATASUM (1U << 0)
1505 #define BTRFS_INODE_NODATACOW (1U << 1)
1506 #define BTRFS_INODE_READONLY (1U << 2)
1507 #define BTRFS_INODE_NOCOMPRESS (1U << 3)
1508 #define BTRFS_INODE_PREALLOC (1U << 4)
1509 #define BTRFS_INODE_SYNC (1U << 5)
1510 #define BTRFS_INODE_IMMUTABLE (1U << 6)
1511 #define BTRFS_INODE_APPEND (1U << 7)
1512 #define BTRFS_INODE_NODUMP (1U << 8)
1513 #define BTRFS_INODE_NOATIME (1U << 9)
1514 #define BTRFS_INODE_DIRSYNC (1U << 10)
1515 #define BTRFS_INODE_COMPRESS (1U << 11)
1517 #define BTRFS_INODE_ROOT_ITEM_INIT (1U << 31)
1519 #define BTRFS_INODE_FLAG_MASK \
1520 (BTRFS_INODE_NODATASUM | \
1521 BTRFS_INODE_NODATACOW | \
1522 BTRFS_INODE_READONLY | \
1523 BTRFS_INODE_NOCOMPRESS | \
1524 BTRFS_INODE_PREALLOC | \
1525 BTRFS_INODE_SYNC | \
1526 BTRFS_INODE_IMMUTABLE | \
1527 BTRFS_INODE_APPEND | \
1528 BTRFS_INODE_NODUMP | \
1529 BTRFS_INODE_NOATIME | \
1530 BTRFS_INODE_DIRSYNC | \
1531 BTRFS_INODE_COMPRESS | \
1532 BTRFS_INODE_ROOT_ITEM_INIT)
1534 #define BTRFS_INODE_RO_VERITY (1U << 0)
1536 #define BTRFS_INODE_RO_FLAG_MASK (BTRFS_INODE_RO_VERITY)
1538 struct btrfs_map_token {
1539 struct extent_buffer *eb;
1541 unsigned long offset;
1544 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1545 ((bytes) >> (fs_info)->sectorsize_bits)
1547 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1548 struct extent_buffer *eb)
1551 token->kaddr = page_address(eb->pages[0]);
1555 /* some macros to generate set/get functions for the struct fields. This
1556 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1559 #define le8_to_cpu(v) (v)
1560 #define cpu_to_le8(v) (v)
1563 static inline u8 get_unaligned_le8(const void *p)
1568 static inline void put_unaligned_le8(u8 val, void *p)
1573 #define read_eb_member(eb, ptr, type, member, result) (\
1574 read_extent_buffer(eb, (char *)(result), \
1575 ((unsigned long)(ptr)) + \
1576 offsetof(type, member), \
1577 sizeof(((type *)0)->member)))
1579 #define write_eb_member(eb, ptr, type, member, result) (\
1580 write_extent_buffer(eb, (char *)(result), \
1581 ((unsigned long)(ptr)) + \
1582 offsetof(type, member), \
1583 sizeof(((type *)0)->member)))
1585 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1586 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
1587 const void *ptr, unsigned long off); \
1588 void btrfs_set_token_##bits(struct btrfs_map_token *token, \
1589 const void *ptr, unsigned long off, \
1591 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
1592 const void *ptr, unsigned long off); \
1593 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
1594 unsigned long off, u##bits val);
1596 DECLARE_BTRFS_SETGET_BITS(8)
1597 DECLARE_BTRFS_SETGET_BITS(16)
1598 DECLARE_BTRFS_SETGET_BITS(32)
1599 DECLARE_BTRFS_SETGET_BITS(64)
1601 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1602 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1605 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1606 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1608 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1611 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1612 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1614 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
1617 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1618 return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1620 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1621 type *s, u##bits val) \
1623 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1624 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
1627 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1628 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1630 const type *p = page_address(eb->pages[0]) + \
1631 offset_in_page(eb->start); \
1632 return get_unaligned_le##bits(&p->member); \
1634 static inline void btrfs_set_##name(const struct extent_buffer *eb, \
1637 type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1638 put_unaligned_le##bits(val, &p->member); \
1641 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1642 static inline u##bits btrfs_##name(const type *s) \
1644 return get_unaligned_le##bits(&s->member); \
1646 static inline void btrfs_set_##name(type *s, u##bits val) \
1648 put_unaligned_le##bits(val, &s->member); \
1651 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1652 struct btrfs_dev_item *s)
1654 BUILD_BUG_ON(sizeof(u64) !=
1655 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1656 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1659 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1660 struct btrfs_dev_item *s,
1663 BUILD_BUG_ON(sizeof(u64) !=
1664 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1665 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1666 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1670 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1671 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1672 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1673 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1674 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1676 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1677 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1678 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1679 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1680 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1681 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1683 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1684 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1686 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1688 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1690 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1692 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1694 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1695 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1697 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1699 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1701 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1704 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1706 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1709 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1711 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1714 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1715 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1716 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1717 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1718 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1719 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1720 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1721 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1722 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1723 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1724 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1726 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1728 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1731 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1732 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1733 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1735 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1737 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1739 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1741 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1742 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1744 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1746 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1747 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1749 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1752 unsigned long offset = (unsigned long)c;
1753 offset += offsetof(struct btrfs_chunk, stripe);
1754 offset += nr * sizeof(struct btrfs_stripe);
1755 return (struct btrfs_stripe *)offset;
1758 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1760 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1763 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1764 struct btrfs_chunk *c, int nr)
1766 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1769 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1770 struct btrfs_chunk *c, int nr)
1772 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1775 /* struct btrfs_block_group_item */
1776 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1778 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1780 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1781 struct btrfs_block_group_item, chunk_objectid, 64);
1783 BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1784 struct btrfs_block_group_item, chunk_objectid, 64);
1785 BTRFS_SETGET_FUNCS(block_group_flags,
1786 struct btrfs_block_group_item, flags, 64);
1787 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1788 struct btrfs_block_group_item, flags, 64);
1790 /* struct btrfs_free_space_info */
1791 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1793 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1795 /* struct btrfs_inode_ref */
1796 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1797 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1799 /* struct btrfs_inode_extref */
1800 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1801 parent_objectid, 64);
1802 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1804 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1806 /* struct btrfs_inode_item */
1807 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1808 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1809 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1810 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1811 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1812 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1813 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1814 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1815 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1816 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1817 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1818 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1819 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1821 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1823 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1825 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1826 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1828 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1830 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1831 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1832 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1833 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1834 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1835 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1836 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1837 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1838 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1839 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1841 /* struct btrfs_dev_extent */
1842 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1844 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1845 chunk_objectid, 64);
1846 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1848 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1849 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1850 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1852 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1854 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1856 static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1857 struct btrfs_tree_block_info *item,
1858 struct btrfs_disk_key *key)
1860 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1863 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1864 struct btrfs_tree_block_info *item,
1865 struct btrfs_disk_key *key)
1867 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1870 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1872 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1874 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1876 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1879 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1882 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1884 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1887 static inline u32 btrfs_extent_inline_ref_size(int type)
1889 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1890 type == BTRFS_SHARED_BLOCK_REF_KEY)
1891 return sizeof(struct btrfs_extent_inline_ref);
1892 if (type == BTRFS_SHARED_DATA_REF_KEY)
1893 return sizeof(struct btrfs_shared_data_ref) +
1894 sizeof(struct btrfs_extent_inline_ref);
1895 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1896 return sizeof(struct btrfs_extent_data_ref) +
1897 offsetof(struct btrfs_extent_inline_ref, offset);
1901 /* struct btrfs_node */
1902 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1903 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1904 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1906 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1909 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1912 ptr = offsetof(struct btrfs_node, ptrs) +
1913 sizeof(struct btrfs_key_ptr) * nr;
1914 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1917 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1921 ptr = offsetof(struct btrfs_node, ptrs) +
1922 sizeof(struct btrfs_key_ptr) * nr;
1923 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1926 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1929 ptr = offsetof(struct btrfs_node, ptrs) +
1930 sizeof(struct btrfs_key_ptr) * nr;
1931 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1934 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1938 ptr = offsetof(struct btrfs_node, ptrs) +
1939 sizeof(struct btrfs_key_ptr) * nr;
1940 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1943 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1945 return offsetof(struct btrfs_node, ptrs) +
1946 sizeof(struct btrfs_key_ptr) * nr;
1949 void btrfs_node_key(const struct extent_buffer *eb,
1950 struct btrfs_disk_key *disk_key, int nr);
1952 static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1953 struct btrfs_disk_key *disk_key, int nr)
1956 ptr = btrfs_node_key_ptr_offset(nr);
1957 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1958 struct btrfs_key_ptr, key, disk_key);
1961 /* struct btrfs_item */
1962 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1963 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1964 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1965 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1967 static inline unsigned long btrfs_item_nr_offset(int nr)
1969 return offsetof(struct btrfs_leaf, items) +
1970 sizeof(struct btrfs_item) * nr;
1973 static inline struct btrfs_item *btrfs_item_nr(int nr)
1975 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1978 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1979 struct btrfs_item *item)
1981 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1984 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1986 return btrfs_item_end(eb, btrfs_item_nr(nr));
1989 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1991 return btrfs_item_offset(eb, btrfs_item_nr(nr));
1994 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1996 return btrfs_item_size(eb, btrfs_item_nr(nr));
1999 static inline void btrfs_item_key(const struct extent_buffer *eb,
2000 struct btrfs_disk_key *disk_key, int nr)
2002 struct btrfs_item *item = btrfs_item_nr(nr);
2003 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2006 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2007 struct btrfs_disk_key *disk_key, int nr)
2009 struct btrfs_item *item = btrfs_item_nr(nr);
2010 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2013 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2016 * struct btrfs_root_ref
2018 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2019 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2020 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2022 /* struct btrfs_dir_item */
2023 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2024 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2025 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2026 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2027 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2028 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2030 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2032 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2035 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2036 const struct btrfs_dir_item *item,
2037 struct btrfs_disk_key *key)
2039 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2042 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2043 struct btrfs_dir_item *item,
2044 const struct btrfs_disk_key *key)
2046 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2049 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2051 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2053 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2056 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2057 const struct btrfs_free_space_header *h,
2058 struct btrfs_disk_key *key)
2060 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2063 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2064 struct btrfs_free_space_header *h,
2065 const struct btrfs_disk_key *key)
2067 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2070 /* struct btrfs_disk_key */
2071 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2073 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2074 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2076 #ifdef __LITTLE_ENDIAN
2079 * Optimized helpers for little-endian architectures where CPU and on-disk
2080 * structures have the same endianness and we can skip conversions.
2083 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2084 const struct btrfs_disk_key *disk_key)
2086 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2089 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2090 const struct btrfs_key *cpu_key)
2092 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2095 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2096 struct btrfs_key *cpu_key, int nr)
2098 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2100 btrfs_node_key(eb, disk_key, nr);
2103 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2104 struct btrfs_key *cpu_key, int nr)
2106 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2108 btrfs_item_key(eb, disk_key, nr);
2111 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2112 const struct btrfs_dir_item *item,
2113 struct btrfs_key *cpu_key)
2115 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2117 btrfs_dir_item_key(eb, item, disk_key);
2122 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2123 const struct btrfs_disk_key *disk)
2125 cpu->offset = le64_to_cpu(disk->offset);
2126 cpu->type = disk->type;
2127 cpu->objectid = le64_to_cpu(disk->objectid);
2130 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2131 const struct btrfs_key *cpu)
2133 disk->offset = cpu_to_le64(cpu->offset);
2134 disk->type = cpu->type;
2135 disk->objectid = cpu_to_le64(cpu->objectid);
2138 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2139 struct btrfs_key *key, int nr)
2141 struct btrfs_disk_key disk_key;
2142 btrfs_node_key(eb, &disk_key, nr);
2143 btrfs_disk_key_to_cpu(key, &disk_key);
2146 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2147 struct btrfs_key *key, int nr)
2149 struct btrfs_disk_key disk_key;
2150 btrfs_item_key(eb, &disk_key, nr);
2151 btrfs_disk_key_to_cpu(key, &disk_key);
2154 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2155 const struct btrfs_dir_item *item,
2156 struct btrfs_key *key)
2158 struct btrfs_disk_key disk_key;
2159 btrfs_dir_item_key(eb, item, &disk_key);
2160 btrfs_disk_key_to_cpu(key, &disk_key);
2165 /* struct btrfs_header */
2166 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2167 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2169 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2170 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2171 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2172 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2173 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2175 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2176 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2178 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2180 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2182 return (btrfs_header_flags(eb) & flag) == flag;
2185 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2187 u64 flags = btrfs_header_flags(eb);
2188 btrfs_set_header_flags(eb, flags | flag);
2191 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2193 u64 flags = btrfs_header_flags(eb);
2194 btrfs_set_header_flags(eb, flags & ~flag);
2197 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2199 u64 flags = btrfs_header_flags(eb);
2200 return flags >> BTRFS_BACKREF_REV_SHIFT;
2203 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2206 u64 flags = btrfs_header_flags(eb);
2207 flags &= ~BTRFS_BACKREF_REV_MASK;
2208 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2209 btrfs_set_header_flags(eb, flags);
2212 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2214 return btrfs_header_level(eb) == 0;
2217 /* struct btrfs_root_item */
2218 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2220 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2221 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2222 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2224 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2226 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2227 BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2228 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2229 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2230 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2231 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2232 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2233 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2234 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2236 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2238 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2240 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2242 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2244 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2247 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2249 /* Byte-swap the constant at compile time, root_item::flags is LE */
2250 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2253 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2255 /* Byte-swap the constant at compile time, root_item::flags is LE */
2256 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2259 static inline u64 btrfs_root_id(const struct btrfs_root *root)
2261 return root->root_key.objectid;
2264 /* struct btrfs_root_backup */
2265 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2267 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2269 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2270 tree_root_level, 8);
2272 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2274 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2275 chunk_root_gen, 64);
2276 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2277 chunk_root_level, 8);
2279 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2281 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2282 extent_root_gen, 64);
2283 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2284 extent_root_level, 8);
2286 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2288 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2290 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2293 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2295 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2297 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2300 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2302 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2304 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2305 csum_root_level, 8);
2306 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2308 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2310 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2313 /* struct btrfs_balance_item */
2314 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2316 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2317 const struct btrfs_balance_item *bi,
2318 struct btrfs_disk_balance_args *ba)
2320 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2323 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2324 struct btrfs_balance_item *bi,
2325 const struct btrfs_disk_balance_args *ba)
2327 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2330 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2331 const struct btrfs_balance_item *bi,
2332 struct btrfs_disk_balance_args *ba)
2334 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2337 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2338 struct btrfs_balance_item *bi,
2339 const struct btrfs_disk_balance_args *ba)
2341 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2344 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2345 const struct btrfs_balance_item *bi,
2346 struct btrfs_disk_balance_args *ba)
2348 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2351 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2352 struct btrfs_balance_item *bi,
2353 const struct btrfs_disk_balance_args *ba)
2355 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2359 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2360 const struct btrfs_disk_balance_args *disk)
2362 memset(cpu, 0, sizeof(*cpu));
2364 cpu->profiles = le64_to_cpu(disk->profiles);
2365 cpu->usage = le64_to_cpu(disk->usage);
2366 cpu->devid = le64_to_cpu(disk->devid);
2367 cpu->pstart = le64_to_cpu(disk->pstart);
2368 cpu->pend = le64_to_cpu(disk->pend);
2369 cpu->vstart = le64_to_cpu(disk->vstart);
2370 cpu->vend = le64_to_cpu(disk->vend);
2371 cpu->target = le64_to_cpu(disk->target);
2372 cpu->flags = le64_to_cpu(disk->flags);
2373 cpu->limit = le64_to_cpu(disk->limit);
2374 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2375 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2379 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2380 const struct btrfs_balance_args *cpu)
2382 memset(disk, 0, sizeof(*disk));
2384 disk->profiles = cpu_to_le64(cpu->profiles);
2385 disk->usage = cpu_to_le64(cpu->usage);
2386 disk->devid = cpu_to_le64(cpu->devid);
2387 disk->pstart = cpu_to_le64(cpu->pstart);
2388 disk->pend = cpu_to_le64(cpu->pend);
2389 disk->vstart = cpu_to_le64(cpu->vstart);
2390 disk->vend = cpu_to_le64(cpu->vend);
2391 disk->target = cpu_to_le64(cpu->target);
2392 disk->flags = cpu_to_le64(cpu->flags);
2393 disk->limit = cpu_to_le64(cpu->limit);
2394 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2395 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2398 /* struct btrfs_super_block */
2399 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2400 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2401 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2403 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2404 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2405 struct btrfs_super_block, sys_chunk_array_size, 32);
2406 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2407 struct btrfs_super_block, chunk_root_generation, 64);
2408 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2410 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2412 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2413 chunk_root_level, 8);
2414 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2416 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2417 log_root_transid, 64);
2418 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2420 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2422 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2424 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2426 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2428 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2430 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2431 root_dir_objectid, 64);
2432 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2434 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2436 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2437 compat_ro_flags, 64);
2438 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2439 incompat_flags, 64);
2440 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2442 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2443 cache_generation, 64);
2444 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2445 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2446 uuid_tree_generation, 64);
2448 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2449 const char *btrfs_super_csum_name(u16 csum_type);
2450 const char *btrfs_super_csum_driver(u16 csum_type);
2451 size_t __attribute_const__ btrfs_get_num_csums(void);
2455 * The leaf data grows from end-to-front in the node.
2456 * this returns the address of the start of the last item,
2457 * which is the stop of the leaf data stack
2459 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2461 u32 nr = btrfs_header_nritems(leaf);
2464 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2465 return btrfs_item_offset_nr(leaf, nr - 1);
2468 /* struct btrfs_file_extent_item */
2469 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2471 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2472 struct btrfs_file_extent_item, disk_bytenr, 64);
2473 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2474 struct btrfs_file_extent_item, offset, 64);
2475 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2476 struct btrfs_file_extent_item, generation, 64);
2477 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2478 struct btrfs_file_extent_item, num_bytes, 64);
2479 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2480 struct btrfs_file_extent_item, ram_bytes, 64);
2481 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2482 struct btrfs_file_extent_item, disk_num_bytes, 64);
2483 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2484 struct btrfs_file_extent_item, compression, 8);
2486 static inline unsigned long
2487 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2489 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2492 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2494 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2497 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2498 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2500 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2502 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2503 disk_num_bytes, 64);
2504 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2506 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2508 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2510 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2512 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2514 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2515 other_encoding, 16);
2518 * this returns the number of bytes used by the item on disk, minus the
2519 * size of any extent headers. If a file is compressed on disk, this is
2520 * the compressed size
2522 static inline u32 btrfs_file_extent_inline_item_len(
2523 const struct extent_buffer *eb,
2524 struct btrfs_item *e)
2526 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2529 /* btrfs_qgroup_status_item */
2530 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2532 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2534 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2536 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2539 /* btrfs_qgroup_info_item */
2540 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2542 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2543 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2545 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2546 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2549 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2550 struct btrfs_qgroup_info_item, generation, 64);
2551 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2553 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2554 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2555 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2557 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2558 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2560 /* btrfs_qgroup_limit_item */
2561 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2563 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2565 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2567 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2569 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2572 /* btrfs_dev_replace_item */
2573 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2574 struct btrfs_dev_replace_item, src_devid, 64);
2575 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2576 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2578 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2580 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2582 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2584 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2585 num_write_errors, 64);
2586 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2587 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2589 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2591 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2594 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2595 struct btrfs_dev_replace_item, src_devid, 64);
2596 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2597 struct btrfs_dev_replace_item,
2598 cont_reading_from_srcdev_mode, 64);
2599 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2600 struct btrfs_dev_replace_item, replace_state, 64);
2601 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2602 struct btrfs_dev_replace_item, time_started, 64);
2603 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2604 struct btrfs_dev_replace_item, time_stopped, 64);
2605 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2606 struct btrfs_dev_replace_item, num_write_errors, 64);
2607 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2608 struct btrfs_dev_replace_item,
2609 num_uncorrectable_read_errors, 64);
2610 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2611 struct btrfs_dev_replace_item, cursor_left, 64);
2612 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2613 struct btrfs_dev_replace_item, cursor_right, 64);
2615 /* helper function to cast into the data area of the leaf. */
2616 #define btrfs_item_ptr(leaf, slot, type) \
2617 ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2618 btrfs_item_offset_nr(leaf, slot)))
2620 #define btrfs_item_ptr_offset(leaf, slot) \
2621 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2622 btrfs_item_offset_nr(leaf, slot)))
2624 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2626 return crc32c(crc, address, length);
2629 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2631 put_unaligned_le32(~crc, result);
2634 static inline u64 btrfs_name_hash(const char *name, int len)
2636 return crc32c((u32)~1, name, len);
2640 * Figure the key offset of an extended inode ref
2642 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2645 return (u64) crc32c(parent_objectid, name, len);
2648 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2650 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2655 enum btrfs_inline_ref_type {
2656 BTRFS_REF_TYPE_INVALID,
2657 BTRFS_REF_TYPE_BLOCK,
2658 BTRFS_REF_TYPE_DATA,
2662 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2663 struct btrfs_extent_inline_ref *iref,
2664 enum btrfs_inline_ref_type is_data);
2665 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2668 * Take the number of bytes to be checksummmed and figure out how many leaves
2669 * it would require to store the csums for that many bytes.
2671 static inline u64 btrfs_csum_bytes_to_leaves(
2672 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2674 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2676 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2680 * Use this if we would be adding new items, as we could split nodes as we cow
2683 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2686 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2690 * Doing a truncate or a modification won't result in new nodes or leaves, just
2691 * what we need for COW.
2693 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2696 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2699 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2700 u64 start, u64 num_bytes);
2701 void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2702 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2703 unsigned long count);
2704 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2705 struct btrfs_delayed_ref_root *delayed_refs,
2706 struct btrfs_delayed_ref_head *head);
2707 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2708 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2709 struct btrfs_fs_info *fs_info, u64 bytenr,
2710 u64 offset, int metadata, u64 *refs, u64 *flags);
2711 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2713 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2714 u64 bytenr, u64 num_bytes);
2715 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2716 int btrfs_cross_ref_exist(struct btrfs_root *root,
2717 u64 objectid, u64 offset, u64 bytenr, bool strict);
2718 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2719 struct btrfs_root *root,
2720 u64 parent, u64 root_objectid,
2721 const struct btrfs_disk_key *key,
2722 int level, u64 hint,
2724 enum btrfs_lock_nesting nest);
2725 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2727 struct extent_buffer *buf,
2728 u64 parent, int last_ref);
2729 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2730 struct btrfs_root *root, u64 owner,
2731 u64 offset, u64 ram_bytes,
2732 struct btrfs_key *ins);
2733 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2734 u64 root_objectid, u64 owner, u64 offset,
2735 struct btrfs_key *ins);
2736 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2737 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2738 struct btrfs_key *ins, int is_data, int delalloc);
2739 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2740 struct extent_buffer *buf, int full_backref);
2741 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2742 struct extent_buffer *buf, int full_backref);
2743 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2744 struct extent_buffer *eb, u64 flags,
2745 int level, int is_data);
2746 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2748 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2749 u64 start, u64 len, int delalloc);
2750 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2752 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2753 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2754 struct btrfs_ref *generic_ref);
2756 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2759 * Different levels for to flush space when doing space reservations.
2761 * The higher the level, the more methods we try to reclaim space.
2763 enum btrfs_reserve_flush_enum {
2764 /* If we are in the transaction, we can't flush anything.*/
2765 BTRFS_RESERVE_NO_FLUSH,
2769 * - Running delayed inode items
2770 * - Allocating a new chunk
2772 BTRFS_RESERVE_FLUSH_LIMIT,
2776 * - Running delayed inode items
2777 * - Running delayed refs
2778 * - Running delalloc and waiting for ordered extents
2779 * - Allocating a new chunk
2781 BTRFS_RESERVE_FLUSH_EVICT,
2784 * Flush space by above mentioned methods and by:
2785 * - Running delayed iputs
2786 * - Committing transaction
2788 * Can be interrupted by a fatal signal.
2790 BTRFS_RESERVE_FLUSH_DATA,
2791 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2792 BTRFS_RESERVE_FLUSH_ALL,
2795 * Pretty much the same as FLUSH_ALL, but can also steal space from
2798 * Can be interrupted by a fatal signal.
2800 BTRFS_RESERVE_FLUSH_ALL_STEAL,
2803 enum btrfs_flush_state {
2804 FLUSH_DELAYED_ITEMS_NR = 1,
2805 FLUSH_DELAYED_ITEMS = 2,
2806 FLUSH_DELAYED_REFS_NR = 3,
2807 FLUSH_DELAYED_REFS = 4,
2809 FLUSH_DELALLOC_WAIT = 6,
2810 FLUSH_DELALLOC_FULL = 7,
2812 ALLOC_CHUNK_FORCE = 9,
2813 RUN_DELAYED_IPUTS = 10,
2817 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2818 struct btrfs_block_rsv *rsv,
2819 int nitems, bool use_global_rsv);
2820 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2821 struct btrfs_block_rsv *rsv);
2822 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2824 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2825 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2826 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2827 u64 start, u64 end);
2828 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2829 u64 num_bytes, u64 *actual_bytes);
2830 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2832 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2833 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2834 struct btrfs_fs_info *fs_info);
2835 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2836 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2837 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2840 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2842 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2843 int btrfs_previous_item(struct btrfs_root *root,
2844 struct btrfs_path *path, u64 min_objectid,
2846 int btrfs_previous_extent_item(struct btrfs_root *root,
2847 struct btrfs_path *path, u64 min_objectid);
2848 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2849 struct btrfs_path *path,
2850 const struct btrfs_key *new_key);
2851 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2852 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2853 struct btrfs_key *key, int lowest_level,
2855 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2856 struct btrfs_path *path,
2858 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2861 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2862 struct btrfs_root *root, struct extent_buffer *buf,
2863 struct extent_buffer *parent, int parent_slot,
2864 struct extent_buffer **cow_ret,
2865 enum btrfs_lock_nesting nest);
2866 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2867 struct btrfs_root *root,
2868 struct extent_buffer *buf,
2869 struct extent_buffer **cow_ret, u64 new_root_objectid);
2870 int btrfs_block_can_be_shared(struct btrfs_root *root,
2871 struct extent_buffer *buf);
2872 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2873 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2874 int btrfs_split_item(struct btrfs_trans_handle *trans,
2875 struct btrfs_root *root,
2876 struct btrfs_path *path,
2877 const struct btrfs_key *new_key,
2878 unsigned long split_offset);
2879 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2880 struct btrfs_root *root,
2881 struct btrfs_path *path,
2882 const struct btrfs_key *new_key);
2883 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2884 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2885 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2886 const struct btrfs_key *key, struct btrfs_path *p,
2887 int ins_len, int cow);
2888 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2889 struct btrfs_path *p, u64 time_seq);
2890 int btrfs_search_slot_for_read(struct btrfs_root *root,
2891 const struct btrfs_key *key,
2892 struct btrfs_path *p, int find_higher,
2894 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2895 struct btrfs_root *root, struct extent_buffer *parent,
2896 int start_slot, u64 *last_ret,
2897 struct btrfs_key *progress);
2898 void btrfs_release_path(struct btrfs_path *p);
2899 struct btrfs_path *btrfs_alloc_path(void);
2900 void btrfs_free_path(struct btrfs_path *p);
2902 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2903 struct btrfs_path *path, int slot, int nr);
2904 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2905 struct btrfs_root *root,
2906 struct btrfs_path *path)
2908 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2911 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2912 const struct btrfs_key *cpu_key, u32 *data_size,
2914 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2915 const struct btrfs_key *key, void *data, u32 data_size);
2916 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2917 struct btrfs_root *root,
2918 struct btrfs_path *path,
2919 const struct btrfs_key *cpu_key, u32 *data_size,
2922 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2923 struct btrfs_root *root,
2924 struct btrfs_path *path,
2925 const struct btrfs_key *key,
2928 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2931 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2932 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2935 int btrfs_search_backwards(struct btrfs_root *root, struct btrfs_key *key,
2936 struct btrfs_path *path);
2938 static inline int btrfs_next_old_item(struct btrfs_root *root,
2939 struct btrfs_path *p, u64 time_seq)
2942 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2943 return btrfs_next_old_leaf(root, p, time_seq);
2948 * Search the tree again to find a leaf with greater keys.
2950 * Returns 0 if it found something or 1 if there are no greater leaves.
2951 * Returns < 0 on error.
2953 static inline int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
2955 return btrfs_next_old_leaf(root, path, 0);
2958 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2960 return btrfs_next_old_item(root, p, 0);
2962 int btrfs_leaf_free_space(struct extent_buffer *leaf);
2963 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
2965 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2966 struct btrfs_root *root,
2967 struct extent_buffer *node,
2968 struct extent_buffer *parent);
2969 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2972 * Do it this way so we only ever do one test_bit in the normal case.
2974 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2975 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2983 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2984 * anything except sleeping. This function is used to check the status of
2986 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
2987 * since setting and checking for SB_RDONLY in the superblock's flags is not
2990 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2992 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
2993 btrfs_fs_closing(fs_info);
2996 static inline void btrfs_set_sb_rdonly(struct super_block *sb)
2998 sb->s_flags |= SB_RDONLY;
2999 set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3002 static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
3004 sb->s_flags &= ~SB_RDONLY;
3005 clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3009 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3010 u64 ref_id, u64 dirid, u64 sequence, const char *name,
3012 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3013 u64 ref_id, u64 dirid, u64 *sequence, const char *name,
3015 int btrfs_del_root(struct btrfs_trans_handle *trans,
3016 const struct btrfs_key *key);
3017 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3018 const struct btrfs_key *key,
3019 struct btrfs_root_item *item);
3020 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3021 struct btrfs_root *root,
3022 struct btrfs_key *key,
3023 struct btrfs_root_item *item);
3024 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3025 struct btrfs_path *path, struct btrfs_root_item *root_item,
3026 struct btrfs_key *root_key);
3027 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3028 void btrfs_set_root_node(struct btrfs_root_item *item,
3029 struct extent_buffer *node);
3030 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3031 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3032 struct btrfs_root *root);
3035 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3037 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3039 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3042 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3043 const char *name, int name_len);
3044 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3045 int name_len, struct btrfs_inode *dir,
3046 struct btrfs_key *location, u8 type, u64 index);
3047 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3048 struct btrfs_root *root,
3049 struct btrfs_path *path, u64 dir,
3050 const char *name, int name_len,
3052 struct btrfs_dir_item *
3053 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3054 struct btrfs_root *root,
3055 struct btrfs_path *path, u64 dir,
3056 u64 index, const char *name, int name_len,
3058 struct btrfs_dir_item *
3059 btrfs_search_dir_index_item(struct btrfs_root *root,
3060 struct btrfs_path *path, u64 dirid,
3061 const char *name, int name_len);
3062 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3063 struct btrfs_root *root,
3064 struct btrfs_path *path,
3065 struct btrfs_dir_item *di);
3066 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3067 struct btrfs_root *root,
3068 struct btrfs_path *path, u64 objectid,
3069 const char *name, u16 name_len,
3070 const void *data, u16 data_len);
3071 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3072 struct btrfs_root *root,
3073 struct btrfs_path *path, u64 dir,
3074 const char *name, u16 name_len,
3076 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3077 struct btrfs_path *path,
3082 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3083 struct btrfs_root *root, u64 offset);
3084 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3085 struct btrfs_root *root, u64 offset);
3086 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3089 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3090 struct btrfs_root *root,
3091 const char *name, int name_len,
3092 u64 inode_objectid, u64 ref_objectid, u64 index);
3093 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3094 struct btrfs_root *root,
3095 const char *name, int name_len,
3096 u64 inode_objectid, u64 ref_objectid, u64 *index);
3097 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3098 struct btrfs_root *root,
3099 struct btrfs_path *path, u64 objectid);
3100 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3101 *root, struct btrfs_path *path,
3102 struct btrfs_key *location, int mod);
3104 struct btrfs_inode_extref *
3105 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3106 struct btrfs_root *root,
3107 struct btrfs_path *path,
3108 const char *name, int name_len,
3109 u64 inode_objectid, u64 ref_objectid, int ins_len,
3112 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
3113 int slot, const char *name,
3115 struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
3116 struct extent_buffer *leaf, int slot, u64 ref_objectid,
3117 const char *name, int name_len);
3119 struct btrfs_dio_private;
3120 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3121 struct btrfs_root *root, u64 bytenr, u64 len);
3122 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3123 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3124 struct btrfs_root *root,
3125 u64 objectid, u64 pos,
3126 u64 disk_offset, u64 disk_num_bytes,
3127 u64 num_bytes, u64 offset, u64 ram_bytes,
3128 u8 compression, u8 encryption, u16 other_encoding);
3129 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3130 struct btrfs_root *root,
3131 struct btrfs_path *path, u64 objectid,
3132 u64 bytenr, int mod);
3133 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3134 struct btrfs_root *root,
3135 struct btrfs_ordered_sum *sums);
3136 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3137 u64 file_start, int contig);
3138 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3139 struct list_head *list, int search_commit);
3140 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3141 const struct btrfs_path *path,
3142 struct btrfs_file_extent_item *fi,
3143 const bool new_inline,
3144 struct extent_map *em);
3145 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3147 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3149 void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3150 u64 btrfs_file_extent_end(const struct btrfs_path *path);
3153 blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3154 int mirror_num, unsigned long bio_flags);
3155 unsigned int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u32 bio_offset,
3156 struct page *page, u64 start, u64 end);
3157 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3158 u64 start, u64 len);
3159 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3160 u64 *orig_start, u64 *orig_block_len,
3161 u64 *ram_bytes, bool strict);
3163 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3164 struct btrfs_inode *inode);
3165 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3166 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3167 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3168 struct btrfs_root *root,
3169 struct btrfs_inode *dir, struct btrfs_inode *inode,
3170 const char *name, int name_len);
3171 int btrfs_add_link(struct btrfs_trans_handle *trans,
3172 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3173 const char *name, int name_len, int add_backref, u64 index);
3174 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3175 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3177 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3178 struct btrfs_root *root,
3179 struct btrfs_inode *inode, u64 new_size,
3180 u32 min_type, u64 *extents_found);
3182 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3183 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3184 bool in_reclaim_context);
3185 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3186 unsigned int extra_bits,
3187 struct extent_state **cached_state);
3188 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3189 struct btrfs_root *new_root,
3190 struct btrfs_root *parent_root,
3191 struct user_namespace *mnt_userns);
3192 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3194 void btrfs_clear_delalloc_extent(struct inode *inode,
3195 struct extent_state *state, unsigned *bits);
3196 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3197 struct extent_state *other);
3198 void btrfs_split_delalloc_extent(struct inode *inode,
3199 struct extent_state *orig, u64 split);
3200 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
3201 unsigned long bio_flags);
3202 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3203 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3204 int btrfs_readpage(struct file *file, struct page *page);
3205 void btrfs_evict_inode(struct inode *inode);
3206 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3207 struct inode *btrfs_alloc_inode(struct super_block *sb);
3208 void btrfs_destroy_inode(struct inode *inode);
3209 void btrfs_free_inode(struct inode *inode);
3210 int btrfs_drop_inode(struct inode *inode);
3211 int __init btrfs_init_cachep(void);
3212 void __cold btrfs_destroy_cachep(void);
3213 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3214 struct btrfs_root *root, struct btrfs_path *path);
3215 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3216 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3217 struct page *page, size_t pg_offset,
3218 u64 start, u64 end);
3219 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3220 struct btrfs_root *root, struct btrfs_inode *inode);
3221 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3222 struct btrfs_root *root, struct btrfs_inode *inode);
3223 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3224 struct btrfs_inode *inode);
3225 int btrfs_orphan_cleanup(struct btrfs_root *root);
3226 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3227 void btrfs_add_delayed_iput(struct inode *inode);
3228 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3229 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3230 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3231 u64 start, u64 num_bytes, u64 min_size,
3232 loff_t actual_len, u64 *alloc_hint);
3233 int btrfs_prealloc_file_range_trans(struct inode *inode,
3234 struct btrfs_trans_handle *trans, int mode,
3235 u64 start, u64 num_bytes, u64 min_size,
3236 loff_t actual_len, u64 *alloc_hint);
3237 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3238 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3239 struct writeback_control *wbc);
3240 int btrfs_writepage_cow_fixup(struct page *page);
3241 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3242 struct page *page, u64 start,
3243 u64 end, bool uptodate);
3244 extern const struct dentry_operations btrfs_dentry_operations;
3245 extern const struct iomap_ops btrfs_dio_iomap_ops;
3246 extern const struct iomap_dio_ops btrfs_dio_ops;
3248 /* Inode locking type flags, by default the exclusive lock is taken */
3249 #define BTRFS_ILOCK_SHARED (1U << 0)
3250 #define BTRFS_ILOCK_TRY (1U << 1)
3251 #define BTRFS_ILOCK_MMAP (1U << 2)
3253 int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3254 void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3255 void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3256 const u64 add_bytes,
3257 const u64 del_bytes);
3260 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3261 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3262 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3263 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3264 struct dentry *dentry, struct fileattr *fa);
3265 int btrfs_ioctl_get_supported_features(void __user *arg);
3266 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3267 int __pure btrfs_is_empty_uuid(u8 *uuid);
3268 int btrfs_defrag_file(struct inode *inode, struct file *file,
3269 struct btrfs_ioctl_defrag_range_args *range,
3270 u64 newer_than, unsigned long max_pages);
3271 void btrfs_get_block_group_info(struct list_head *groups_list,
3272 struct btrfs_ioctl_space_info *space);
3273 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3274 struct btrfs_ioctl_balance_args *bargs);
3275 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3276 enum btrfs_exclusive_operation type);
3277 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3278 enum btrfs_exclusive_operation type);
3279 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3280 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3283 int __init btrfs_auto_defrag_init(void);
3284 void __cold btrfs_auto_defrag_exit(void);
3285 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3286 struct btrfs_inode *inode);
3287 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3288 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3289 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3290 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3292 extern const struct file_operations btrfs_file_operations;
3293 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3294 struct btrfs_root *root, struct btrfs_inode *inode,
3295 struct btrfs_drop_extents_args *args);
3296 int btrfs_replace_file_extents(struct btrfs_inode *inode,
3297 struct btrfs_path *path, const u64 start,
3299 struct btrfs_replace_extent_info *extent_info,
3300 struct btrfs_trans_handle **trans_out);
3301 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3302 struct btrfs_inode *inode, u64 start, u64 end);
3303 int btrfs_release_file(struct inode *inode, struct file *file);
3304 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3305 size_t num_pages, loff_t pos, size_t write_bytes,
3306 struct extent_state **cached, bool noreserve);
3307 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3308 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3309 size_t *write_bytes);
3310 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3313 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3314 struct btrfs_root *root);
3317 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3318 unsigned long new_flags);
3319 int btrfs_sync_fs(struct super_block *sb, int wait);
3320 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3321 u64 subvol_objectid);
3323 static inline __printf(2, 3) __cold
3324 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3328 #ifdef CONFIG_PRINTK
3331 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3333 #define btrfs_printk(fs_info, fmt, args...) \
3334 btrfs_no_printk(fs_info, fmt, ##args)
3337 #define btrfs_emerg(fs_info, fmt, args...) \
3338 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3339 #define btrfs_alert(fs_info, fmt, args...) \
3340 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3341 #define btrfs_crit(fs_info, fmt, args...) \
3342 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3343 #define btrfs_err(fs_info, fmt, args...) \
3344 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3345 #define btrfs_warn(fs_info, fmt, args...) \
3346 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3347 #define btrfs_notice(fs_info, fmt, args...) \
3348 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3349 #define btrfs_info(fs_info, fmt, args...) \
3350 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3353 * Wrappers that use printk_in_rcu
3355 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3356 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3357 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3358 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3359 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3360 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3361 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3362 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3363 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3364 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3365 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3366 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3367 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3368 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3371 * Wrappers that use a ratelimited printk_in_rcu
3373 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3374 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3375 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3376 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3377 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3378 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3379 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3380 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3381 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3382 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3383 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3384 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3385 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3386 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3389 * Wrappers that use a ratelimited printk
3391 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3392 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3393 #define btrfs_alert_rl(fs_info, fmt, args...) \
3394 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3395 #define btrfs_crit_rl(fs_info, fmt, args...) \
3396 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3397 #define btrfs_err_rl(fs_info, fmt, args...) \
3398 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3399 #define btrfs_warn_rl(fs_info, fmt, args...) \
3400 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3401 #define btrfs_notice_rl(fs_info, fmt, args...) \
3402 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3403 #define btrfs_info_rl(fs_info, fmt, args...) \
3404 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3406 #if defined(CONFIG_DYNAMIC_DEBUG)
3407 #define btrfs_debug(fs_info, fmt, args...) \
3408 _dynamic_func_call_no_desc(fmt, btrfs_printk, \
3409 fs_info, KERN_DEBUG fmt, ##args)
3410 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3411 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \
3412 fs_info, KERN_DEBUG fmt, ##args)
3413 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3414 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \
3415 fs_info, KERN_DEBUG fmt, ##args)
3416 #define btrfs_debug_rl(fs_info, fmt, args...) \
3417 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \
3418 fs_info, KERN_DEBUG fmt, ##args)
3419 #elif defined(DEBUG)
3420 #define btrfs_debug(fs_info, fmt, args...) \
3421 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3422 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3423 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3424 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3425 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3426 #define btrfs_debug_rl(fs_info, fmt, args...) \
3427 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3429 #define btrfs_debug(fs_info, fmt, args...) \
3430 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3431 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3432 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3433 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3434 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3435 #define btrfs_debug_rl(fs_info, fmt, args...) \
3436 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3439 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3442 btrfs_printk(fs_info, fmt, ##args); \
3443 rcu_read_unlock(); \
3446 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \
3449 btrfs_no_printk(fs_info, fmt, ##args); \
3450 rcu_read_unlock(); \
3453 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3455 static DEFINE_RATELIMIT_STATE(_rs, \
3456 DEFAULT_RATELIMIT_INTERVAL, \
3457 DEFAULT_RATELIMIT_BURST); \
3458 if (__ratelimit(&_rs)) \
3459 btrfs_printk(fs_info, fmt, ##args); \
3462 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3465 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3466 rcu_read_unlock(); \
3469 #ifdef CONFIG_BTRFS_ASSERT
3471 static inline void assertfail(const char *expr, const char *file, int line)
3473 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3477 #define ASSERT(expr) \
3478 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3481 static inline void assertfail(const char *expr, const char* file, int line) { }
3482 #define ASSERT(expr) (void)(expr)
3485 #if BITS_PER_LONG == 32
3486 #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3488 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3489 * addresses of extents.
3491 * For 4K page size it's about 10T, for 64K it's 160T.
3493 #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3494 void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3495 void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3499 * Get the correct offset inside the page of extent buffer.
3501 * @eb: target extent buffer
3502 * @start: offset inside the extent buffer
3504 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3506 static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3507 unsigned long offset)
3510 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3511 * to PAGE_SIZE, thus adding it won't cause any difference.
3513 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3514 * to the eb, thus we have to take the eb->start into consideration.
3516 return offset_in_page(offset + eb->start);
3519 static inline unsigned long get_eb_page_index(unsigned long offset)
3522 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3524 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3525 * and have ensured that all tree blocks are contained in one page,
3526 * thus we always get index == 0.
3528 return offset >> PAGE_SHIFT;
3532 * Use that for functions that are conditionally exported for sanity tests but
3535 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3536 #define EXPORT_FOR_TESTS static
3538 #define EXPORT_FOR_TESTS
3542 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3545 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3550 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3551 unsigned int line, int errno, const char *fmt, ...);
3553 const char * __attribute_const__ btrfs_decode_error(int errno);
3556 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3557 const char *function,
3558 unsigned int line, int errno);
3561 * Call btrfs_abort_transaction as early as possible when an error condition is
3562 * detected, that way the exact line number is reported.
3564 #define btrfs_abort_transaction(trans, errno) \
3566 /* Report first abort since mount */ \
3567 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3568 &((trans)->fs_info->fs_state))) { \
3569 if ((errno) != -EIO && (errno) != -EROFS) { \
3570 WARN(1, KERN_DEBUG \
3571 "BTRFS: Transaction aborted (error %d)\n", \
3574 btrfs_debug((trans)->fs_info, \
3575 "Transaction aborted (error %d)", \
3579 __btrfs_abort_transaction((trans), __func__, \
3580 __LINE__, (errno)); \
3583 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3585 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3586 (errno), fmt, ##args); \
3589 #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \
3590 (unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \
3591 &(fs_info)->fs_state)))
3595 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3596 unsigned int line, int errno, const char *fmt, ...);
3598 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3599 * will panic(). Otherwise we BUG() here.
3601 #define btrfs_panic(fs_info, errno, fmt, args...) \
3603 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3608 /* compatibility and incompatibility defines */
3610 #define btrfs_set_fs_incompat(__fs_info, opt) \
3611 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3614 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3615 u64 flag, const char* name)
3617 struct btrfs_super_block *disk_super;
3620 disk_super = fs_info->super_copy;
3621 features = btrfs_super_incompat_flags(disk_super);
3622 if (!(features & flag)) {
3623 spin_lock(&fs_info->super_lock);
3624 features = btrfs_super_incompat_flags(disk_super);
3625 if (!(features & flag)) {
3627 btrfs_set_super_incompat_flags(disk_super, features);
3629 "setting incompat feature flag for %s (0x%llx)",
3632 spin_unlock(&fs_info->super_lock);
3636 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3637 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3640 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3641 u64 flag, const char* name)
3643 struct btrfs_super_block *disk_super;
3646 disk_super = fs_info->super_copy;
3647 features = btrfs_super_incompat_flags(disk_super);
3648 if (features & flag) {
3649 spin_lock(&fs_info->super_lock);
3650 features = btrfs_super_incompat_flags(disk_super);
3651 if (features & flag) {
3653 btrfs_set_super_incompat_flags(disk_super, features);
3655 "clearing incompat feature flag for %s (0x%llx)",
3658 spin_unlock(&fs_info->super_lock);
3662 #define btrfs_fs_incompat(fs_info, opt) \
3663 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3665 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3667 struct btrfs_super_block *disk_super;
3668 disk_super = fs_info->super_copy;
3669 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3672 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3673 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3676 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3677 u64 flag, const char *name)
3679 struct btrfs_super_block *disk_super;
3682 disk_super = fs_info->super_copy;
3683 features = btrfs_super_compat_ro_flags(disk_super);
3684 if (!(features & flag)) {
3685 spin_lock(&fs_info->super_lock);
3686 features = btrfs_super_compat_ro_flags(disk_super);
3687 if (!(features & flag)) {
3689 btrfs_set_super_compat_ro_flags(disk_super, features);
3691 "setting compat-ro feature flag for %s (0x%llx)",
3694 spin_unlock(&fs_info->super_lock);
3698 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3699 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3702 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3703 u64 flag, const char *name)
3705 struct btrfs_super_block *disk_super;
3708 disk_super = fs_info->super_copy;
3709 features = btrfs_super_compat_ro_flags(disk_super);
3710 if (features & flag) {
3711 spin_lock(&fs_info->super_lock);
3712 features = btrfs_super_compat_ro_flags(disk_super);
3713 if (features & flag) {
3715 btrfs_set_super_compat_ro_flags(disk_super, features);
3717 "clearing compat-ro feature flag for %s (0x%llx)",
3720 spin_unlock(&fs_info->super_lock);
3724 #define btrfs_fs_compat_ro(fs_info, opt) \
3725 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3727 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3729 struct btrfs_super_block *disk_super;
3730 disk_super = fs_info->super_copy;
3731 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3735 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3736 struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu);
3737 int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3738 struct posix_acl *acl, int type);
3739 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3740 struct inode *inode, struct inode *dir);
3742 #define btrfs_get_acl NULL
3743 #define btrfs_set_acl NULL
3744 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3745 struct inode *inode, struct inode *dir)
3752 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3753 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3754 struct btrfs_root *root);
3755 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3756 struct btrfs_root *root);
3757 int btrfs_recover_relocation(struct btrfs_root *root);
3758 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3759 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3760 struct btrfs_root *root, struct extent_buffer *buf,
3761 struct extent_buffer *cow);
3762 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3763 u64 *bytes_to_reserve);
3764 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3765 struct btrfs_pending_snapshot *pending);
3766 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3767 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3769 int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3772 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3773 u64 end, struct btrfs_scrub_progress *progress,
3774 int readonly, int is_dev_replace);
3775 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3776 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3777 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3778 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3779 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3780 struct btrfs_scrub_progress *progress);
3781 static inline void btrfs_init_full_stripe_locks_tree(
3782 struct btrfs_full_stripe_locks_tree *locks_root)
3784 locks_root->root = RB_ROOT;
3785 mutex_init(&locks_root->lock);
3789 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3790 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3791 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3793 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3795 btrfs_bio_counter_sub(fs_info, 1);
3799 struct reada_control {
3800 struct btrfs_fs_info *fs_info; /* tree to prefetch */
3801 struct btrfs_key key_start;
3802 struct btrfs_key key_end; /* exclusive */
3805 wait_queue_head_t wait;
3807 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3808 struct btrfs_key *start, struct btrfs_key *end);
3809 int btrfs_reada_wait(void *handle);
3810 void btrfs_reada_detach(void *handle);
3811 int btree_readahead_hook(struct extent_buffer *eb, int err);
3812 void btrfs_reada_remove_dev(struct btrfs_device *dev);
3813 void btrfs_reada_undo_remove_dev(struct btrfs_device *dev);
3815 static inline int is_fstree(u64 rootid)
3817 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3818 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3819 !btrfs_qgroup_level(rootid)))
3824 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3826 return signal_pending(current);
3830 #ifdef CONFIG_FS_VERITY
3832 extern const struct fsverity_operations btrfs_verityops;
3833 int btrfs_drop_verity_items(struct btrfs_inode *inode);
3835 BTRFS_SETGET_FUNCS(verity_descriptor_encryption, struct btrfs_verity_descriptor_item,
3837 BTRFS_SETGET_FUNCS(verity_descriptor_size, struct btrfs_verity_descriptor_item,
3839 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_encryption,
3840 struct btrfs_verity_descriptor_item, encryption, 8);
3841 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_size,
3842 struct btrfs_verity_descriptor_item, size, 64);
3846 static inline int btrfs_drop_verity_items(struct btrfs_inode *inode)
3853 /* Sanity test specific functions */
3854 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3855 void btrfs_test_destroy_inode(struct inode *inode);
3856 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3858 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3861 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3867 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
3869 return fs_info->zoned != 0;
3872 static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root)
3874 return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;
3878 * We use page status Private2 to indicate there is an ordered extent with
3881 * Rename the Private2 accessors to Ordered, to improve readability.
3883 #define PageOrdered(page) PagePrivate2(page)
3884 #define SetPageOrdered(page) SetPagePrivate2(page)
3885 #define ClearPageOrdered(page) ClearPagePrivate2(page)