1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2007 Oracle. All rights reserved.
10 #include <linux/sched/signal.h>
11 #include <linux/highmem.h>
13 #include <linux/rwsem.h>
14 #include <linux/semaphore.h>
15 #include <linux/completion.h>
16 #include <linux/backing-dev.h>
17 #include <linux/wait.h>
18 #include <linux/slab.h>
19 #include <trace/events/btrfs.h>
20 #include <asm/unaligned.h>
21 #include <linux/pagemap.h>
22 #include <linux/btrfs.h>
23 #include <linux/btrfs_tree.h>
24 #include <linux/workqueue.h>
25 #include <linux/security.h>
26 #include <linux/sizes.h>
27 #include <linux/dynamic_debug.h>
28 #include <linux/refcount.h>
29 #include <linux/crc32c.h>
30 #include <linux/iomap.h>
31 #include "extent-io-tree.h"
32 #include "extent_io.h"
33 #include "extent_map.h"
34 #include "async-thread.h"
35 #include "block-rsv.h"
38 struct btrfs_trans_handle;
39 struct btrfs_transaction;
40 struct btrfs_pending_snapshot;
41 struct btrfs_delayed_ref_root;
42 struct btrfs_space_info;
43 struct btrfs_block_group;
44 extern struct kmem_cache *btrfs_trans_handle_cachep;
45 extern struct kmem_cache *btrfs_bit_radix_cachep;
46 extern struct kmem_cache *btrfs_path_cachep;
47 extern struct kmem_cache *btrfs_free_space_cachep;
48 extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
49 struct btrfs_ordered_sum;
52 struct btrfs_ioctl_encoded_io_args;
54 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
57 * Maximum number of mirrors that can be available for all profiles counting
58 * the target device of dev-replace as one. During an active device replace
59 * procedure, the target device of the copy operation is a mirror for the
60 * filesystem data as well that can be used to read data in order to repair
61 * read errors on other disks.
63 * Current value is derived from RAID1C4 with 4 copies.
65 #define BTRFS_MAX_MIRRORS (4 + 1)
67 #define BTRFS_MAX_LEVEL 8
69 #define BTRFS_OLDEST_GENERATION 0ULL
72 * we can actually store much bigger names, but lets not confuse the rest
75 #define BTRFS_NAME_LEN 255
78 * Theoretical limit is larger, but we keep this down to a sane
79 * value. That should limit greatly the possibility of collisions on
82 #define BTRFS_LINK_MAX 65535U
84 #define BTRFS_EMPTY_DIR_SIZE 0
86 /* ioprio of readahead is set to idle */
87 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
89 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M
92 * Use large batch size to reduce overhead of metadata updates. On the reader
93 * side, we only read it when we are close to ENOSPC and the read overhead is
94 * mostly related to the number of CPUs, so it is OK to use arbitrary large
97 #define BTRFS_TOTAL_BYTES_PINNED_BATCH SZ_128M
99 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
102 * Deltas are an effective way to populate global statistics. Give macro names
103 * to make it clear what we're doing. An example is discard_extents in
104 * btrfs_free_space_ctl.
106 #define BTRFS_STAT_NR_ENTRIES 2
107 #define BTRFS_STAT_CURR 0
108 #define BTRFS_STAT_PREV 1
110 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
112 BUG_ON(num_stripes == 0);
113 return sizeof(struct btrfs_chunk) +
114 sizeof(struct btrfs_stripe) * (num_stripes - 1);
118 * Runtime (in-memory) states of filesystem
121 /* Global indicator of serious filesystem errors */
122 BTRFS_FS_STATE_ERROR,
124 * Filesystem is being remounted, allow to skip some operations, like
127 BTRFS_FS_STATE_REMOUNTING,
128 /* Filesystem in RO mode */
130 /* Track if a transaction abort has been reported on this filesystem */
131 BTRFS_FS_STATE_TRANS_ABORTED,
133 * Bio operations should be blocked on this filesystem because a source
134 * or target device is being destroyed as part of a device replace
136 BTRFS_FS_STATE_DEV_REPLACING,
137 /* The btrfs_fs_info created for self-tests */
138 BTRFS_FS_STATE_DUMMY_FS_INFO,
140 BTRFS_FS_STATE_NO_CSUMS,
142 /* Indicates there was an error cleaning up a log tree. */
143 BTRFS_FS_STATE_LOG_CLEANUP_ERROR,
148 #define BTRFS_BACKREF_REV_MAX 256
149 #define BTRFS_BACKREF_REV_SHIFT 56
150 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
151 BTRFS_BACKREF_REV_SHIFT)
153 #define BTRFS_OLD_BACKREF_REV 0
154 #define BTRFS_MIXED_BACKREF_REV 1
157 * every tree block (leaf or node) starts with this header.
159 struct btrfs_header {
160 /* these first four must match the super block */
161 u8 csum[BTRFS_CSUM_SIZE];
162 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
163 __le64 bytenr; /* which block this node is supposed to live in */
166 /* allowed to be different from the super from here on down */
167 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
172 } __attribute__ ((__packed__));
175 * this is a very generous portion of the super block, giving us
176 * room to translate 14 chunks with 3 stripes each.
178 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
181 * just in case we somehow lose the roots and are not able to mount,
182 * we store an array of the roots from previous transactions
185 #define BTRFS_NUM_BACKUP_ROOTS 4
186 struct btrfs_root_backup {
188 __le64 tree_root_gen;
191 __le64 chunk_root_gen;
194 __le64 extent_root_gen;
203 __le64 csum_root_gen;
213 u8 extent_root_level;
217 /* future and to align */
219 } __attribute__ ((__packed__));
221 #define BTRFS_SUPER_INFO_OFFSET SZ_64K
222 #define BTRFS_SUPER_INFO_SIZE 4096
225 * The reserved space at the beginning of each device.
226 * It covers the primary super block and leaves space for potential use by other
227 * tools like bootloaders or to lower potential damage of accidental overwrite.
229 #define BTRFS_DEVICE_RANGE_RESERVED (SZ_1M)
232 * the super block basically lists the main trees of the FS
233 * it currently lacks any block count etc etc
235 struct btrfs_super_block {
236 /* the first 4 fields must match struct btrfs_header */
237 u8 csum[BTRFS_CSUM_SIZE];
238 /* FS specific UUID, visible to user */
239 u8 fsid[BTRFS_FSID_SIZE];
240 __le64 bytenr; /* this block number */
243 /* allowed to be different from the btrfs_header from here own down */
251 * This member has never been utilized since the very beginning, thus
252 * it's always 0 regardless of kernel version. We always use
253 * generation + 1 to read log tree root. So here we mark it deprecated.
255 __le64 __unused_log_root_transid;
258 __le64 root_dir_objectid;
262 __le32 __unused_leafsize;
264 __le32 sys_chunk_array_size;
265 __le64 chunk_root_generation;
267 __le64 compat_ro_flags;
268 __le64 incompat_flags;
273 struct btrfs_dev_item dev_item;
275 char label[BTRFS_LABEL_SIZE];
277 __le64 cache_generation;
278 __le64 uuid_tree_generation;
280 /* the UUID written into btree blocks */
281 u8 metadata_uuid[BTRFS_FSID_SIZE];
284 __le64 block_group_root;
285 __le64 block_group_root_generation;
286 u8 block_group_root_level;
288 /* future expansion */
291 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
292 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
294 /* Padded to 4096 bytes */
296 } __attribute__ ((__packed__));
297 static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE);
300 * Compat flags that we support. If any incompat flags are set other than the
301 * ones specified below then we will fail to mount
303 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
304 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
305 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
307 #define BTRFS_FEATURE_COMPAT_RO_SUPP \
308 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
309 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
310 BTRFS_FEATURE_COMPAT_RO_VERITY)
312 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
313 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
315 #ifdef CONFIG_BTRFS_DEBUG
317 * Extent tree v2 supported only with CONFIG_BTRFS_DEBUG
319 #define BTRFS_FEATURE_INCOMPAT_SUPP \
320 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
321 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
322 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
323 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
324 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
325 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
326 BTRFS_FEATURE_INCOMPAT_RAID56 | \
327 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
328 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
329 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
330 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
331 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
332 BTRFS_FEATURE_INCOMPAT_ZONED | \
333 BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2)
335 #define BTRFS_FEATURE_INCOMPAT_SUPP \
336 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
337 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
338 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
339 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
340 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
341 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
342 BTRFS_FEATURE_INCOMPAT_RAID56 | \
343 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
344 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
345 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
346 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
347 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
348 BTRFS_FEATURE_INCOMPAT_ZONED)
351 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
352 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
353 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
356 * A leaf is full of items. offset and size tell us where to find
357 * the item in the leaf (relative to the start of the data area)
360 struct btrfs_disk_key key;
363 } __attribute__ ((__packed__));
366 * leaves have an item area and a data area:
367 * [item0, item1....itemN] [free space] [dataN...data1, data0]
369 * The data is separate from the items to get the keys closer together
373 struct btrfs_header header;
374 struct btrfs_item items[];
375 } __attribute__ ((__packed__));
378 * all non-leaf blocks are nodes, they hold only keys and pointers to
381 struct btrfs_key_ptr {
382 struct btrfs_disk_key key;
385 } __attribute__ ((__packed__));
388 struct btrfs_header header;
389 struct btrfs_key_ptr ptrs[];
390 } __attribute__ ((__packed__));
392 /* Read ahead values for struct btrfs_path.reada */
398 * Similar to READA_FORWARD but unlike it:
400 * 1) It will trigger readahead even for leaves that are not close to
401 * each other on disk;
402 * 2) It also triggers readahead for nodes;
403 * 3) During a search, even when a node or leaf is already in memory, it
404 * will still trigger readahead for other nodes and leaves that follow
407 * This is meant to be used only when we know we are iterating over the
408 * entire tree or a very large part of it.
410 READA_FORWARD_ALWAYS,
414 * btrfs_paths remember the path taken from the root down to the leaf.
415 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
416 * to any other levels that are present.
418 * The slots array records the index of the item or block pointer
419 * used while walking the tree.
422 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
423 int slots[BTRFS_MAX_LEVEL];
424 /* if there is real range locking, this locks field will change */
425 u8 locks[BTRFS_MAX_LEVEL];
427 /* keep some upper locks as we walk down */
431 * set by btrfs_split_item, tells search_slot to keep all locks
432 * and to force calls to keep space in the nodes
434 unsigned int search_for_split:1;
435 unsigned int keep_locks:1;
436 unsigned int skip_locking:1;
437 unsigned int search_commit_root:1;
438 unsigned int need_commit_sem:1;
439 unsigned int skip_release_on_error:1;
441 * Indicate that new item (btrfs_search_slot) is extending already
442 * existing item and ins_len contains only the data size and not item
443 * header (ie. sizeof(struct btrfs_item) is not included).
445 unsigned int search_for_extension:1;
447 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
448 sizeof(struct btrfs_item))
449 struct btrfs_dev_replace {
450 u64 replace_state; /* see #define above */
451 time64_t time_started; /* seconds since 1-Jan-1970 */
452 time64_t time_stopped; /* seconds since 1-Jan-1970 */
453 atomic64_t num_write_errors;
454 atomic64_t num_uncorrectable_read_errors;
457 u64 committed_cursor_left;
458 u64 cursor_left_last_write_of_item;
461 u64 cont_reading_from_srcdev_mode; /* see #define above */
464 int item_needs_writeback;
465 struct btrfs_device *srcdev;
466 struct btrfs_device *tgtdev;
468 struct mutex lock_finishing_cancel_unmount;
469 struct rw_semaphore rwsem;
471 struct btrfs_scrub_progress scrub_progress;
473 struct percpu_counter bio_counter;
474 wait_queue_head_t replace_wait;
478 * free clusters are used to claim free space in relatively large chunks,
479 * allowing us to do less seeky writes. They are used for all metadata
480 * allocations. In ssd_spread mode they are also used for data allocations.
482 struct btrfs_free_cluster {
484 spinlock_t refill_lock;
487 /* largest extent in this cluster */
490 /* first extent starting offset */
493 /* We did a full search and couldn't create a cluster */
496 struct btrfs_block_group *block_group;
498 * when a cluster is allocated from a block group, we put the
499 * cluster onto a list in the block group so that it can
500 * be freed before the block group is freed.
502 struct list_head block_group_list;
505 enum btrfs_caching_type {
509 BTRFS_CACHE_FINISHED,
514 * Tree to record all locked full stripes of a RAID5/6 block group
516 struct btrfs_full_stripe_locks_tree {
521 /* Discard control. */
523 * Async discard uses multiple lists to differentiate the discard filter
524 * parameters. Index 0 is for completely free block groups where we need to
525 * ensure the entire block group is trimmed without being lossy. Indices
526 * afterwards represent monotonically decreasing discard filter sizes to
527 * prioritize what should be discarded next.
529 #define BTRFS_NR_DISCARD_LISTS 3
530 #define BTRFS_DISCARD_INDEX_UNUSED 0
531 #define BTRFS_DISCARD_INDEX_START 1
533 struct btrfs_discard_ctl {
534 struct workqueue_struct *discard_workers;
535 struct delayed_work work;
537 struct btrfs_block_group *block_group;
538 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
540 u64 prev_discard_time;
541 atomic_t discardable_extents;
542 atomic64_t discardable_bytes;
543 u64 max_discard_size;
547 u64 discard_extent_bytes;
548 u64 discard_bitmap_bytes;
549 atomic64_t discard_bytes_saved;
552 void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
555 struct reloc_control;
557 struct btrfs_fs_devices;
558 struct btrfs_balance_control;
559 struct btrfs_delayed_root;
562 * Block group or device which contains an active swapfile. Used for preventing
563 * unsafe operations while a swapfile is active.
565 * These are sorted on (ptr, inode) (note that a block group or device can
566 * contain more than one swapfile). We compare the pointer values because we
567 * don't actually care what the object is, we just need a quick check whether
568 * the object exists in the rbtree.
570 struct btrfs_swapfile_pin {
575 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
576 * points to a struct btrfs_device.
580 * Only used when 'is_block_group' is true and it is the number of
581 * extents used by a swapfile for this block group ('ptr' field).
586 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
589 BTRFS_FS_CLOSING_START,
590 BTRFS_FS_CLOSING_DONE,
591 BTRFS_FS_LOG_RECOVERING,
593 BTRFS_FS_QUOTA_ENABLED,
594 BTRFS_FS_UPDATE_UUID_TREE_GEN,
595 BTRFS_FS_CREATING_FREE_SPACE_TREE,
599 BTRFS_FS_QUOTA_OVERRIDE,
600 /* Used to record internally whether fs has been frozen */
603 * Indicate that balance has been set up from the ioctl and is in the
604 * main phase. The fs_info::balance_ctl is initialized.
606 BTRFS_FS_BALANCE_RUNNING,
609 * Indicate that relocation of a chunk has started, it's set per chunk
610 * and is toggled between chunks.
612 BTRFS_FS_RELOC_RUNNING,
614 /* Indicate that the cleaner thread is awake and doing something. */
615 BTRFS_FS_CLEANER_RUNNING,
618 * The checksumming has an optimized version and is considered fast,
619 * so we don't need to offload checksums to workqueues.
621 BTRFS_FS_CSUM_IMPL_FAST,
623 /* Indicate that the discard workqueue can service discards. */
624 BTRFS_FS_DISCARD_RUNNING,
626 /* Indicate that we need to cleanup space cache v1 */
627 BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
629 /* Indicate that we can't trust the free space tree for caching yet */
630 BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
632 /* Indicate whether there are any tree modification log users */
633 BTRFS_FS_TREE_MOD_LOG_USERS,
635 /* Indicate that we want the transaction kthread to commit right now. */
636 BTRFS_FS_COMMIT_TRANS,
638 /* Indicate we have half completed snapshot deletions pending. */
639 BTRFS_FS_UNFINISHED_DROPS,
641 /* Indicate we have to finish a zone to do next allocation. */
642 BTRFS_FS_NEED_ZONE_FINISH,
644 #if BITS_PER_LONG == 32
645 /* Indicate if we have error/warn message printed on 32bit systems */
646 BTRFS_FS_32BIT_ERROR,
652 * Exclusive operations (device replace, resize, device add/remove, balance)
654 enum btrfs_exclusive_operation {
656 BTRFS_EXCLOP_BALANCE_PAUSED,
657 BTRFS_EXCLOP_BALANCE,
658 BTRFS_EXCLOP_DEV_ADD,
659 BTRFS_EXCLOP_DEV_REMOVE,
660 BTRFS_EXCLOP_DEV_REPLACE,
662 BTRFS_EXCLOP_SWAP_ACTIVATE,
665 /* Store data about transaction commits, exported via sysfs. */
666 struct btrfs_commit_stats {
667 /* Total number of commits */
669 /* The maximum commit duration so far in ns */
671 /* The last commit duration in ns */
673 /* The total commit duration in ns */
674 u64 total_commit_dur;
677 struct btrfs_fs_info {
678 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
680 struct btrfs_root *tree_root;
681 struct btrfs_root *chunk_root;
682 struct btrfs_root *dev_root;
683 struct btrfs_root *fs_root;
684 struct btrfs_root *quota_root;
685 struct btrfs_root *uuid_root;
686 struct btrfs_root *data_reloc_root;
687 struct btrfs_root *block_group_root;
689 /* the log root tree is a directory of all the other log roots */
690 struct btrfs_root *log_root_tree;
692 /* The tree that holds the global roots (csum, extent, etc) */
693 rwlock_t global_root_lock;
694 struct rb_root global_root_tree;
696 spinlock_t fs_roots_radix_lock;
697 struct radix_tree_root fs_roots_radix;
699 /* block group cache stuff */
700 rwlock_t block_group_cache_lock;
701 struct rb_root_cached block_group_cache_tree;
703 /* keep track of unallocated space */
704 atomic64_t free_chunk_space;
706 /* Track ranges which are used by log trees blocks/logged data extents */
707 struct extent_io_tree excluded_extents;
709 /* logical->physical extent mapping */
710 struct extent_map_tree mapping_tree;
713 * block reservation for extent, checksum, root tree and
714 * delayed dir index item
716 struct btrfs_block_rsv global_block_rsv;
717 /* block reservation for metadata operations */
718 struct btrfs_block_rsv trans_block_rsv;
719 /* block reservation for chunk tree */
720 struct btrfs_block_rsv chunk_block_rsv;
721 /* block reservation for delayed operations */
722 struct btrfs_block_rsv delayed_block_rsv;
723 /* block reservation for delayed refs */
724 struct btrfs_block_rsv delayed_refs_rsv;
726 struct btrfs_block_rsv empty_block_rsv;
729 u64 last_trans_committed;
731 * Generation of the last transaction used for block group relocation
732 * since the filesystem was last mounted (or 0 if none happened yet).
733 * Must be written and read while holding btrfs_fs_info::commit_root_sem.
735 u64 last_reloc_trans;
736 u64 avg_delayed_ref_runtime;
739 * this is updated to the current trans every time a full commit
740 * is required instead of the faster short fsync log commits
742 u64 last_trans_log_full_commit;
743 unsigned long mount_opt;
745 * Track requests for actions that need to be done during transaction
746 * commit (like for some mount options).
748 unsigned long pending_changes;
749 unsigned long compress_type:4;
750 unsigned int compress_level;
753 * It is a suggestive number, the read side is safe even it gets a
754 * wrong number because we will write out the data into a regular
755 * extent. The write side(mount/remount) is under ->s_umount lock,
756 * so it is also safe.
760 struct btrfs_transaction *running_transaction;
761 wait_queue_head_t transaction_throttle;
762 wait_queue_head_t transaction_wait;
763 wait_queue_head_t transaction_blocked_wait;
764 wait_queue_head_t async_submit_wait;
767 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
768 * when they are updated.
770 * Because we do not clear the flags for ever, so we needn't use
771 * the lock on the read side.
773 * We also needn't use the lock when we mount the fs, because
774 * there is no other task which will update the flag.
776 spinlock_t super_lock;
777 struct btrfs_super_block *super_copy;
778 struct btrfs_super_block *super_for_commit;
779 struct super_block *sb;
780 struct inode *btree_inode;
781 struct mutex tree_log_mutex;
782 struct mutex transaction_kthread_mutex;
783 struct mutex cleaner_mutex;
784 struct mutex chunk_mutex;
787 * this is taken to make sure we don't set block groups ro after
788 * the free space cache has been allocated on them
790 struct mutex ro_block_group_mutex;
792 /* this is used during read/modify/write to make sure
793 * no two ios are trying to mod the same stripe at the same
796 struct btrfs_stripe_hash_table *stripe_hash_table;
799 * this protects the ordered operations list only while we are
800 * processing all of the entries on it. This way we make
801 * sure the commit code doesn't find the list temporarily empty
802 * because another function happens to be doing non-waiting preflush
803 * before jumping into the main commit.
805 struct mutex ordered_operations_mutex;
807 struct rw_semaphore commit_root_sem;
809 struct rw_semaphore cleanup_work_sem;
811 struct rw_semaphore subvol_sem;
813 spinlock_t trans_lock;
815 * the reloc mutex goes with the trans lock, it is taken
816 * during commit to protect us from the relocation code
818 struct mutex reloc_mutex;
820 struct list_head trans_list;
821 struct list_head dead_roots;
822 struct list_head caching_block_groups;
824 spinlock_t delayed_iput_lock;
825 struct list_head delayed_iputs;
826 atomic_t nr_delayed_iputs;
827 wait_queue_head_t delayed_iputs_wait;
829 atomic64_t tree_mod_seq;
831 /* this protects tree_mod_log and tree_mod_seq_list */
832 rwlock_t tree_mod_log_lock;
833 struct rb_root tree_mod_log;
834 struct list_head tree_mod_seq_list;
836 atomic_t async_delalloc_pages;
839 * this is used to protect the following list -- ordered_roots.
841 spinlock_t ordered_root_lock;
844 * all fs/file tree roots in which there are data=ordered extents
845 * pending writeback are added into this list.
847 * these can span multiple transactions and basically include
848 * every dirty data page that isn't from nodatacow
850 struct list_head ordered_roots;
852 struct mutex delalloc_root_mutex;
853 spinlock_t delalloc_root_lock;
854 /* all fs/file tree roots that have delalloc inodes. */
855 struct list_head delalloc_roots;
858 * there is a pool of worker threads for checksumming during writes
859 * and a pool for checksumming after reads. This is because readers
860 * can run with FS locks held, and the writers may be waiting for
861 * those locks. We don't want ordering in the pending list to cause
862 * deadlocks, and so the two are serviced separately.
864 * A third pool does submit_bio to avoid deadlocking with the other
867 struct btrfs_workqueue *workers;
868 struct btrfs_workqueue *hipri_workers;
869 struct btrfs_workqueue *delalloc_workers;
870 struct btrfs_workqueue *flush_workers;
871 struct workqueue_struct *endio_workers;
872 struct workqueue_struct *endio_meta_workers;
873 struct workqueue_struct *endio_raid56_workers;
874 struct workqueue_struct *rmw_workers;
875 struct workqueue_struct *compressed_write_workers;
876 struct btrfs_workqueue *endio_write_workers;
877 struct btrfs_workqueue *endio_freespace_worker;
878 struct btrfs_workqueue *caching_workers;
881 * fixup workers take dirty pages that didn't properly go through
882 * the cow mechanism and make them safe to write. It happens
883 * for the sys_munmap function call path
885 struct btrfs_workqueue *fixup_workers;
886 struct btrfs_workqueue *delayed_workers;
888 struct task_struct *transaction_kthread;
889 struct task_struct *cleaner_kthread;
890 u32 thread_pool_size;
892 struct kobject *space_info_kobj;
893 struct kobject *qgroups_kobj;
895 /* used to keep from writing metadata until there is a nice batch */
896 struct percpu_counter dirty_metadata_bytes;
897 struct percpu_counter delalloc_bytes;
898 struct percpu_counter ordered_bytes;
899 s32 dirty_metadata_batch;
902 struct list_head dirty_cowonly_roots;
904 struct btrfs_fs_devices *fs_devices;
907 * The space_info list is effectively read only after initial
908 * setup. It is populated at mount time and cleaned up after
909 * all block groups are removed. RCU is used to protect it.
911 struct list_head space_info;
913 struct btrfs_space_info *data_sinfo;
915 struct reloc_control *reloc_ctl;
917 /* data_alloc_cluster is only used in ssd_spread mode */
918 struct btrfs_free_cluster data_alloc_cluster;
920 /* all metadata allocations go through this cluster */
921 struct btrfs_free_cluster meta_alloc_cluster;
923 /* auto defrag inodes go here */
924 spinlock_t defrag_inodes_lock;
925 struct rb_root defrag_inodes;
926 atomic_t defrag_running;
928 /* Used to protect avail_{data, metadata, system}_alloc_bits */
929 seqlock_t profiles_lock;
931 * these three are in extended format (availability of single
932 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
933 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
935 u64 avail_data_alloc_bits;
936 u64 avail_metadata_alloc_bits;
937 u64 avail_system_alloc_bits;
939 /* restriper state */
940 spinlock_t balance_lock;
941 struct mutex balance_mutex;
942 atomic_t balance_pause_req;
943 atomic_t balance_cancel_req;
944 struct btrfs_balance_control *balance_ctl;
945 wait_queue_head_t balance_wait_q;
947 /* Cancellation requests for chunk relocation */
948 atomic_t reloc_cancel_req;
950 u32 data_chunk_allocations;
955 /* private scrub information */
956 struct mutex scrub_lock;
957 atomic_t scrubs_running;
958 atomic_t scrub_pause_req;
959 atomic_t scrubs_paused;
960 atomic_t scrub_cancel_req;
961 wait_queue_head_t scrub_pause_wait;
963 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
966 refcount_t scrub_workers_refcnt;
967 struct workqueue_struct *scrub_workers;
968 struct workqueue_struct *scrub_wr_completion_workers;
969 struct workqueue_struct *scrub_parity_workers;
970 struct btrfs_subpage_info *subpage_info;
972 struct btrfs_discard_ctl discard_ctl;
974 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
975 u32 check_integrity_print_mask;
977 /* is qgroup tracking in a consistent state? */
980 /* holds configuration and tracking. Protected by qgroup_lock */
981 struct rb_root qgroup_tree;
982 spinlock_t qgroup_lock;
985 * used to avoid frequently calling ulist_alloc()/ulist_free()
986 * when doing qgroup accounting, it must be protected by qgroup_lock.
988 struct ulist *qgroup_ulist;
991 * Protect user change for quota operations. If a transaction is needed,
992 * it must be started before locking this lock.
994 struct mutex qgroup_ioctl_lock;
996 /* list of dirty qgroups to be written at next commit */
997 struct list_head dirty_qgroups;
999 /* used by qgroup for an efficient tree traversal */
1002 /* qgroup rescan items */
1003 struct mutex qgroup_rescan_lock; /* protects the progress item */
1004 struct btrfs_key qgroup_rescan_progress;
1005 struct btrfs_workqueue *qgroup_rescan_workers;
1006 struct completion qgroup_rescan_completion;
1007 struct btrfs_work qgroup_rescan_work;
1008 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */
1010 /* filesystem state */
1011 unsigned long fs_state;
1013 struct btrfs_delayed_root *delayed_root;
1015 /* Extent buffer radix tree */
1016 spinlock_t buffer_lock;
1017 /* Entries are eb->start / sectorsize */
1018 struct radix_tree_root buffer_radix;
1020 /* next backup root to be overwritten */
1021 int backup_root_index;
1023 /* device replace state */
1024 struct btrfs_dev_replace dev_replace;
1026 struct semaphore uuid_tree_rescan_sem;
1028 /* Used to reclaim the metadata space in the background. */
1029 struct work_struct async_reclaim_work;
1030 struct work_struct async_data_reclaim_work;
1031 struct work_struct preempt_reclaim_work;
1033 /* Reclaim partially filled block groups in the background */
1034 struct work_struct reclaim_bgs_work;
1035 struct list_head reclaim_bgs;
1036 int bg_reclaim_threshold;
1038 spinlock_t unused_bgs_lock;
1039 struct list_head unused_bgs;
1040 struct mutex unused_bg_unpin_mutex;
1041 /* Protect block groups that are going to be deleted */
1042 struct mutex reclaim_bgs_lock;
1044 /* Cached block sizes */
1047 /* ilog2 of sectorsize, use to avoid 64bit division */
1048 u32 sectorsize_bits;
1054 * Maximum size of an extent. BTRFS_MAX_EXTENT_SIZE on regular
1055 * filesystem, on zoned it depends on the device constraints.
1057 u64 max_extent_size;
1059 /* Block groups and devices containing active swapfiles. */
1060 spinlock_t swapfile_pins_lock;
1061 struct rb_root swapfile_pins;
1063 struct crypto_shash *csum_shash;
1065 /* Type of exclusive operation running, protected by super_lock */
1066 enum btrfs_exclusive_operation exclusive_operation;
1069 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1070 * if the mode is enabled
1074 /* Max size to emit ZONE_APPEND write command */
1075 u64 max_zone_append_size;
1076 struct mutex zoned_meta_io_lock;
1077 spinlock_t treelog_bg_lock;
1081 * Start of the dedicated data relocation block group, protected by
1082 * relocation_bg_lock.
1084 spinlock_t relocation_bg_lock;
1086 struct mutex zoned_data_reloc_io_lock;
1088 u64 nr_global_roots;
1090 spinlock_t zone_active_bgs_lock;
1091 struct list_head zone_active_bgs;
1092 /* Waiters when BTRFS_FS_NEED_ZONE_FINISH is set */
1093 wait_queue_head_t zone_finish_wait;
1095 /* Updates are not protected by any lock */
1096 struct btrfs_commit_stats commit_stats;
1098 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1099 spinlock_t ref_verify_lock;
1100 struct rb_root block_tree;
1103 #ifdef CONFIG_BTRFS_DEBUG
1104 struct kobject *debug_kobj;
1105 struct kobject *discard_debug_kobj;
1106 struct list_head allocated_roots;
1108 spinlock_t eb_leak_lock;
1109 struct list_head allocated_ebs;
1113 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1115 return sb->s_fs_info;
1119 * The state of btrfs root
1123 * btrfs_record_root_in_trans is a multi-step process, and it can race
1124 * with the balancing code. But the race is very small, and only the
1125 * first time the root is added to each transaction. So IN_TRANS_SETUP
1126 * is used to tell us when more checks are required
1128 BTRFS_ROOT_IN_TRANS_SETUP,
1131 * Set if tree blocks of this root can be shared by other roots.
1132 * Only subvolume trees and their reloc trees have this bit set.
1133 * Conflicts with TRACK_DIRTY bit.
1135 * This affects two things:
1137 * - How balance works
1138 * For shareable roots, we need to use reloc tree and do path
1139 * replacement for balance, and need various pre/post hooks for
1140 * snapshot creation to handle them.
1142 * While for non-shareable trees, we just simply do a tree search
1145 * - How dirty roots are tracked
1146 * For shareable roots, btrfs_record_root_in_trans() is needed to
1147 * track them, while non-subvolume roots have TRACK_DIRTY bit, they
1148 * don't need to set this manually.
1150 BTRFS_ROOT_SHAREABLE,
1151 BTRFS_ROOT_TRACK_DIRTY,
1152 BTRFS_ROOT_IN_RADIX,
1153 BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1154 BTRFS_ROOT_DEFRAG_RUNNING,
1155 BTRFS_ROOT_FORCE_COW,
1156 BTRFS_ROOT_MULTI_LOG_TASKS,
1158 BTRFS_ROOT_DELETING,
1161 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1163 * Set for the subvolume tree owning the reloc tree.
1165 BTRFS_ROOT_DEAD_RELOC_TREE,
1166 /* Mark dead root stored on device whose cleanup needs to be resumed */
1167 BTRFS_ROOT_DEAD_TREE,
1168 /* The root has a log tree. Used for subvolume roots and the tree root. */
1169 BTRFS_ROOT_HAS_LOG_TREE,
1170 /* Qgroup flushing is in progress */
1171 BTRFS_ROOT_QGROUP_FLUSHING,
1172 /* We started the orphan cleanup for this root. */
1173 BTRFS_ROOT_ORPHAN_CLEANUP,
1174 /* This root has a drop operation that was started previously. */
1175 BTRFS_ROOT_UNFINISHED_DROP,
1178 static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
1180 clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags);
1184 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1185 * code. For detail check comment in fs/btrfs/qgroup.c.
1187 struct btrfs_qgroup_swapped_blocks {
1189 /* RM_EMPTY_ROOT() of above blocks[] */
1191 struct rb_root blocks[BTRFS_MAX_LEVEL];
1195 * in ram representation of the tree. extent_root is used for all allocations
1196 * and for the extent tree extent_root root.
1199 struct rb_node rb_node;
1201 struct extent_buffer *node;
1203 struct extent_buffer *commit_root;
1204 struct btrfs_root *log_root;
1205 struct btrfs_root *reloc_root;
1207 unsigned long state;
1208 struct btrfs_root_item root_item;
1209 struct btrfs_key root_key;
1210 struct btrfs_fs_info *fs_info;
1211 struct extent_io_tree dirty_log_pages;
1213 struct mutex objectid_mutex;
1215 spinlock_t accounting_lock;
1216 struct btrfs_block_rsv *block_rsv;
1218 struct mutex log_mutex;
1219 wait_queue_head_t log_writer_wait;
1220 wait_queue_head_t log_commit_wait[2];
1221 struct list_head log_ctxs[2];
1222 /* Used only for log trees of subvolumes, not for the log root tree */
1223 atomic_t log_writers;
1224 atomic_t log_commit[2];
1225 /* Used only for log trees of subvolumes, not for the log root tree */
1228 /* No matter the commit succeeds or not*/
1229 int log_transid_committed;
1230 /* Just be updated when the commit succeeds. */
1231 int last_log_commit;
1232 pid_t log_start_pid;
1240 struct btrfs_key defrag_progress;
1241 struct btrfs_key defrag_max;
1243 /* The dirty list is only used by non-shareable roots */
1244 struct list_head dirty_list;
1246 struct list_head root_list;
1248 spinlock_t log_extents_lock[2];
1249 struct list_head logged_list[2];
1251 spinlock_t inode_lock;
1252 /* red-black tree that keeps track of in-memory inodes */
1253 struct rb_root inode_tree;
1256 * radix tree that keeps track of delayed nodes of every inode,
1257 * protected by inode_lock
1259 struct radix_tree_root delayed_nodes_tree;
1261 * right now this just gets used so that a root has its own devid
1262 * for stat. It may be used for more later
1266 spinlock_t root_item_lock;
1269 struct mutex delalloc_mutex;
1270 spinlock_t delalloc_lock;
1272 * all of the inodes that have delalloc bytes. It is possible for
1273 * this list to be empty even when there is still dirty data=ordered
1274 * extents waiting to finish IO.
1276 struct list_head delalloc_inodes;
1277 struct list_head delalloc_root;
1278 u64 nr_delalloc_inodes;
1280 struct mutex ordered_extent_mutex;
1282 * this is used by the balancing code to wait for all the pending
1285 spinlock_t ordered_extent_lock;
1288 * all of the data=ordered extents pending writeback
1289 * these can span multiple transactions and basically include
1290 * every dirty data page that isn't from nodatacow
1292 struct list_head ordered_extents;
1293 struct list_head ordered_root;
1294 u64 nr_ordered_extents;
1297 * Not empty if this subvolume root has gone through tree block swap
1300 * Will be used by reloc_control::dirty_subvol_roots.
1302 struct list_head reloc_dirty_list;
1305 * Number of currently running SEND ioctls to prevent
1306 * manipulation with the read-only status via SUBVOL_SETFLAGS
1308 int send_in_progress;
1310 * Number of currently running deduplication operations that have a
1311 * destination inode belonging to this root. Protected by the lock
1314 int dedupe_in_progress;
1315 /* For exclusion of snapshot creation and nocow writes */
1316 struct btrfs_drew_lock snapshot_lock;
1318 atomic_t snapshot_force_cow;
1320 /* For qgroup metadata reserved space */
1321 spinlock_t qgroup_meta_rsv_lock;
1322 u64 qgroup_meta_rsv_pertrans;
1323 u64 qgroup_meta_rsv_prealloc;
1324 wait_queue_head_t qgroup_flush_wait;
1326 /* Number of active swapfiles */
1327 atomic_t nr_swapfiles;
1329 /* Record pairs of swapped blocks for qgroup */
1330 struct btrfs_qgroup_swapped_blocks swapped_blocks;
1332 /* Used only by log trees, when logging csum items */
1333 struct extent_io_tree log_csum_range;
1335 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1339 #ifdef CONFIG_BTRFS_DEBUG
1340 struct list_head leak_list;
1345 * Structure that conveys information about an extent that is going to replace
1346 * all the extents in a file range.
1348 struct btrfs_replace_extent_info {
1354 /* Pointer to a file extent item of type regular or prealloc. */
1357 * Set to true when attempting to replace a file range with a new extent
1358 * described by this structure, set to false when attempting to clone an
1359 * existing extent into a file range.
1362 /* Indicate if we should update the inode's mtime and ctime. */
1364 /* Meaningful only if is_new_extent is true. */
1365 int qgroup_reserved;
1367 * Meaningful only if is_new_extent is true.
1368 * Used to track how many extent items we have already inserted in a
1369 * subvolume tree that refer to the extent described by this structure,
1370 * so that we know when to create a new delayed ref or update an existing
1376 /* Arguments for btrfs_drop_extents() */
1377 struct btrfs_drop_extents_args {
1378 /* Input parameters */
1381 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1382 * If 'replace_extent' is true, this must not be NULL. Also the path
1383 * is always released except if 'replace_extent' is true and
1384 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1385 * the path is kept locked.
1387 struct btrfs_path *path;
1388 /* Start offset of the range to drop extents from */
1390 /* End (exclusive, last byte + 1) of the range to drop extents from */
1392 /* If true drop all the extent maps in the range */
1395 * If true it means we want to insert a new extent after dropping all
1396 * the extents in the range. If this is true, the 'extent_item_size'
1397 * parameter must be set as well and the 'extent_inserted' field will
1398 * be set to true by btrfs_drop_extents() if it could insert the new
1400 * Note: when this is set to true the path must not be NULL.
1402 bool replace_extent;
1404 * Used if 'replace_extent' is true. Size of the file extent item to
1405 * insert after dropping all existing extents in the range
1407 u32 extent_item_size;
1409 /* Output parameters */
1412 * Set to the minimum between the input parameter 'end' and the end
1413 * (exclusive, last byte + 1) of the last dropped extent. This is always
1414 * set even if btrfs_drop_extents() returns an error.
1418 * The number of allocated bytes found in the range. This can be smaller
1419 * than the range's length when there are holes in the range.
1423 * Only set if 'replace_extent' is true. Set to true if we were able
1424 * to insert a replacement extent after dropping all extents in the
1425 * range, otherwise set to false by btrfs_drop_extents().
1426 * Also, if btrfs_drop_extents() has set this to true it means it
1427 * returned with the path locked, otherwise if it has set this to
1428 * false it has returned with the path released.
1430 bool extent_inserted;
1433 struct btrfs_file_private {
1438 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1441 return info->nodesize - sizeof(struct btrfs_header);
1444 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items)
1446 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1448 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1451 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1453 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1456 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1457 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1458 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1460 return BTRFS_MAX_ITEM_SIZE(info) -
1461 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1464 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1466 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1470 * Flags for mount options.
1472 * Note: don't forget to add new options to btrfs_show_options()
1475 BTRFS_MOUNT_NODATASUM = (1UL << 0),
1476 BTRFS_MOUNT_NODATACOW = (1UL << 1),
1477 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
1478 BTRFS_MOUNT_SSD = (1UL << 3),
1479 BTRFS_MOUNT_DEGRADED = (1UL << 4),
1480 BTRFS_MOUNT_COMPRESS = (1UL << 5),
1481 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
1482 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
1483 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
1484 BTRFS_MOUNT_NOSSD = (1UL << 9),
1485 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
1486 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
1487 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
1488 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
1489 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
1490 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
1491 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
1492 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
1493 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
1494 BTRFS_MOUNT_CHECK_INTEGRITY = (1UL << 19),
1495 BTRFS_MOUNT_CHECK_INTEGRITY_DATA = (1UL << 20),
1496 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 21),
1497 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 22),
1498 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 23),
1499 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 24),
1500 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 25),
1501 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 26),
1502 BTRFS_MOUNT_REF_VERIFY = (1UL << 27),
1503 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 28),
1504 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 29),
1505 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 30),
1508 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1509 #define BTRFS_DEFAULT_MAX_INLINE (2048)
1511 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1512 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1513 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1514 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1517 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1519 if (!btrfs_test_opt(fs_info, opt)) \
1520 btrfs_info(fs_info, fmt, ##args); \
1521 btrfs_set_opt(fs_info->mount_opt, opt); \
1524 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1526 if (btrfs_test_opt(fs_info, opt)) \
1527 btrfs_info(fs_info, fmt, ##args); \
1528 btrfs_clear_opt(fs_info->mount_opt, opt); \
1532 * Requests for changes that need to be done during transaction commit.
1534 * Internal mount options that are used for special handling of the real
1535 * mount options (eg. cannot be set during remount and have to be set during
1536 * transaction commit)
1539 #define BTRFS_PENDING_COMMIT (0)
1541 #define btrfs_test_pending(info, opt) \
1542 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1543 #define btrfs_set_pending(info, opt) \
1544 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1545 #define btrfs_clear_pending(info, opt) \
1546 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1549 * Helpers for setting pending mount option changes.
1551 * Expects corresponding macros
1552 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1554 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1556 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1557 btrfs_info((info), fmt, ##args); \
1558 btrfs_set_pending((info), SET_##opt); \
1559 btrfs_clear_pending((info), CLEAR_##opt); \
1563 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1565 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1566 btrfs_info((info), fmt, ##args); \
1567 btrfs_set_pending((info), CLEAR_##opt); \
1568 btrfs_clear_pending((info), SET_##opt); \
1575 #define BTRFS_INODE_NODATASUM (1U << 0)
1576 #define BTRFS_INODE_NODATACOW (1U << 1)
1577 #define BTRFS_INODE_READONLY (1U << 2)
1578 #define BTRFS_INODE_NOCOMPRESS (1U << 3)
1579 #define BTRFS_INODE_PREALLOC (1U << 4)
1580 #define BTRFS_INODE_SYNC (1U << 5)
1581 #define BTRFS_INODE_IMMUTABLE (1U << 6)
1582 #define BTRFS_INODE_APPEND (1U << 7)
1583 #define BTRFS_INODE_NODUMP (1U << 8)
1584 #define BTRFS_INODE_NOATIME (1U << 9)
1585 #define BTRFS_INODE_DIRSYNC (1U << 10)
1586 #define BTRFS_INODE_COMPRESS (1U << 11)
1588 #define BTRFS_INODE_ROOT_ITEM_INIT (1U << 31)
1590 #define BTRFS_INODE_FLAG_MASK \
1591 (BTRFS_INODE_NODATASUM | \
1592 BTRFS_INODE_NODATACOW | \
1593 BTRFS_INODE_READONLY | \
1594 BTRFS_INODE_NOCOMPRESS | \
1595 BTRFS_INODE_PREALLOC | \
1596 BTRFS_INODE_SYNC | \
1597 BTRFS_INODE_IMMUTABLE | \
1598 BTRFS_INODE_APPEND | \
1599 BTRFS_INODE_NODUMP | \
1600 BTRFS_INODE_NOATIME | \
1601 BTRFS_INODE_DIRSYNC | \
1602 BTRFS_INODE_COMPRESS | \
1603 BTRFS_INODE_ROOT_ITEM_INIT)
1605 #define BTRFS_INODE_RO_VERITY (1U << 0)
1607 #define BTRFS_INODE_RO_FLAG_MASK (BTRFS_INODE_RO_VERITY)
1609 struct btrfs_map_token {
1610 struct extent_buffer *eb;
1612 unsigned long offset;
1615 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1616 ((bytes) >> (fs_info)->sectorsize_bits)
1618 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1619 struct extent_buffer *eb)
1622 token->kaddr = page_address(eb->pages[0]);
1626 /* some macros to generate set/get functions for the struct fields. This
1627 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1630 #define le8_to_cpu(v) (v)
1631 #define cpu_to_le8(v) (v)
1634 static inline u8 get_unaligned_le8(const void *p)
1639 static inline void put_unaligned_le8(u8 val, void *p)
1644 #define read_eb_member(eb, ptr, type, member, result) (\
1645 read_extent_buffer(eb, (char *)(result), \
1646 ((unsigned long)(ptr)) + \
1647 offsetof(type, member), \
1648 sizeof(((type *)0)->member)))
1650 #define write_eb_member(eb, ptr, type, member, result) (\
1651 write_extent_buffer(eb, (char *)(result), \
1652 ((unsigned long)(ptr)) + \
1653 offsetof(type, member), \
1654 sizeof(((type *)0)->member)))
1656 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1657 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
1658 const void *ptr, unsigned long off); \
1659 void btrfs_set_token_##bits(struct btrfs_map_token *token, \
1660 const void *ptr, unsigned long off, \
1662 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
1663 const void *ptr, unsigned long off); \
1664 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
1665 unsigned long off, u##bits val);
1667 DECLARE_BTRFS_SETGET_BITS(8)
1668 DECLARE_BTRFS_SETGET_BITS(16)
1669 DECLARE_BTRFS_SETGET_BITS(32)
1670 DECLARE_BTRFS_SETGET_BITS(64)
1672 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1673 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1676 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1677 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1679 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1682 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1683 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1685 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
1688 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1689 return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1691 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1692 type *s, u##bits val) \
1694 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1695 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
1698 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1699 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1701 const type *p = page_address(eb->pages[0]) + \
1702 offset_in_page(eb->start); \
1703 return get_unaligned_le##bits(&p->member); \
1705 static inline void btrfs_set_##name(const struct extent_buffer *eb, \
1708 type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1709 put_unaligned_le##bits(val, &p->member); \
1712 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1713 static inline u##bits btrfs_##name(const type *s) \
1715 return get_unaligned_le##bits(&s->member); \
1717 static inline void btrfs_set_##name(type *s, u##bits val) \
1719 put_unaligned_le##bits(val, &s->member); \
1722 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1723 struct btrfs_dev_item *s)
1725 static_assert(sizeof(u64) ==
1726 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1727 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1730 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1731 struct btrfs_dev_item *s,
1734 static_assert(sizeof(u64) ==
1735 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1736 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1737 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1741 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1742 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1743 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1744 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1745 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1747 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1748 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1749 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1750 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1751 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1752 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1754 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1755 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1757 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1759 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1761 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1763 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1765 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1766 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1768 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1770 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1772 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1775 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1777 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1780 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1782 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1785 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1786 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1787 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1788 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1789 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1790 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1791 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1792 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1793 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1794 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1795 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1797 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1799 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1802 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1803 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1804 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1806 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1808 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1810 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1812 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1813 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1815 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1817 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1818 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1820 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1823 unsigned long offset = (unsigned long)c;
1824 offset += offsetof(struct btrfs_chunk, stripe);
1825 offset += nr * sizeof(struct btrfs_stripe);
1826 return (struct btrfs_stripe *)offset;
1829 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1831 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1834 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1835 struct btrfs_chunk *c, int nr)
1837 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1840 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1841 struct btrfs_chunk *c, int nr)
1843 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1846 /* struct btrfs_block_group_item */
1847 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1849 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1851 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1852 struct btrfs_block_group_item, chunk_objectid, 64);
1854 BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1855 struct btrfs_block_group_item, chunk_objectid, 64);
1856 BTRFS_SETGET_FUNCS(block_group_flags,
1857 struct btrfs_block_group_item, flags, 64);
1858 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1859 struct btrfs_block_group_item, flags, 64);
1861 /* struct btrfs_free_space_info */
1862 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1864 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1866 /* struct btrfs_inode_ref */
1867 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1868 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1870 /* struct btrfs_inode_extref */
1871 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1872 parent_objectid, 64);
1873 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1875 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1877 /* struct btrfs_inode_item */
1878 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1879 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1880 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1881 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1882 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1883 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1884 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1885 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1886 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1887 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1888 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1889 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1890 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1892 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1894 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1896 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1897 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1899 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1901 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1902 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1903 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1904 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1905 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1906 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1907 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1908 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1909 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1910 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1912 /* struct btrfs_dev_extent */
1913 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1915 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1916 chunk_objectid, 64);
1917 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1919 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1920 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1921 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1923 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1925 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1927 static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1928 struct btrfs_tree_block_info *item,
1929 struct btrfs_disk_key *key)
1931 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1934 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1935 struct btrfs_tree_block_info *item,
1936 struct btrfs_disk_key *key)
1938 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1941 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1943 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1945 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1947 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1950 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1953 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1955 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1958 static inline u32 btrfs_extent_inline_ref_size(int type)
1960 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1961 type == BTRFS_SHARED_BLOCK_REF_KEY)
1962 return sizeof(struct btrfs_extent_inline_ref);
1963 if (type == BTRFS_SHARED_DATA_REF_KEY)
1964 return sizeof(struct btrfs_shared_data_ref) +
1965 sizeof(struct btrfs_extent_inline_ref);
1966 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1967 return sizeof(struct btrfs_extent_data_ref) +
1968 offsetof(struct btrfs_extent_inline_ref, offset);
1972 /* struct btrfs_node */
1973 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1974 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1975 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1977 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1980 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1983 ptr = offsetof(struct btrfs_node, ptrs) +
1984 sizeof(struct btrfs_key_ptr) * nr;
1985 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1988 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1992 ptr = offsetof(struct btrfs_node, ptrs) +
1993 sizeof(struct btrfs_key_ptr) * nr;
1994 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1997 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
2000 ptr = offsetof(struct btrfs_node, ptrs) +
2001 sizeof(struct btrfs_key_ptr) * nr;
2002 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
2005 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
2009 ptr = offsetof(struct btrfs_node, ptrs) +
2010 sizeof(struct btrfs_key_ptr) * nr;
2011 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
2014 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
2016 return offsetof(struct btrfs_node, ptrs) +
2017 sizeof(struct btrfs_key_ptr) * nr;
2020 void btrfs_node_key(const struct extent_buffer *eb,
2021 struct btrfs_disk_key *disk_key, int nr);
2023 static inline void btrfs_set_node_key(const struct extent_buffer *eb,
2024 struct btrfs_disk_key *disk_key, int nr)
2027 ptr = btrfs_node_key_ptr_offset(nr);
2028 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
2029 struct btrfs_key_ptr, key, disk_key);
2032 /* struct btrfs_item */
2033 BTRFS_SETGET_FUNCS(raw_item_offset, struct btrfs_item, offset, 32);
2034 BTRFS_SETGET_FUNCS(raw_item_size, struct btrfs_item, size, 32);
2035 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
2036 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
2038 static inline unsigned long btrfs_item_nr_offset(int nr)
2040 return offsetof(struct btrfs_leaf, items) +
2041 sizeof(struct btrfs_item) * nr;
2044 static inline struct btrfs_item *btrfs_item_nr(int nr)
2046 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2049 #define BTRFS_ITEM_SETGET_FUNCS(member) \
2050 static inline u32 btrfs_item_##member(const struct extent_buffer *eb, \
2053 return btrfs_raw_item_##member(eb, btrfs_item_nr(slot)); \
2055 static inline void btrfs_set_item_##member(const struct extent_buffer *eb, \
2056 int slot, u32 val) \
2058 btrfs_set_raw_item_##member(eb, btrfs_item_nr(slot), val); \
2060 static inline u32 btrfs_token_item_##member(struct btrfs_map_token *token, \
2063 struct btrfs_item *item = btrfs_item_nr(slot); \
2064 return btrfs_token_raw_item_##member(token, item); \
2066 static inline void btrfs_set_token_item_##member(struct btrfs_map_token *token, \
2067 int slot, u32 val) \
2069 struct btrfs_item *item = btrfs_item_nr(slot); \
2070 btrfs_set_token_raw_item_##member(token, item, val); \
2073 BTRFS_ITEM_SETGET_FUNCS(offset)
2074 BTRFS_ITEM_SETGET_FUNCS(size);
2076 static inline u32 btrfs_item_data_end(const struct extent_buffer *eb, int nr)
2078 return btrfs_item_offset(eb, nr) + btrfs_item_size(eb, nr);
2081 static inline void btrfs_item_key(const struct extent_buffer *eb,
2082 struct btrfs_disk_key *disk_key, int nr)
2084 struct btrfs_item *item = btrfs_item_nr(nr);
2085 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2088 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2089 struct btrfs_disk_key *disk_key, int nr)
2091 struct btrfs_item *item = btrfs_item_nr(nr);
2092 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2095 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2098 * struct btrfs_root_ref
2100 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2101 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2102 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2104 /* struct btrfs_dir_item */
2105 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2106 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2107 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2108 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2109 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2110 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2112 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2114 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2117 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2118 const struct btrfs_dir_item *item,
2119 struct btrfs_disk_key *key)
2121 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2124 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2125 struct btrfs_dir_item *item,
2126 const struct btrfs_disk_key *key)
2128 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2131 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2133 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2135 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2138 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2139 const struct btrfs_free_space_header *h,
2140 struct btrfs_disk_key *key)
2142 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2145 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2146 struct btrfs_free_space_header *h,
2147 const struct btrfs_disk_key *key)
2149 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2152 /* struct btrfs_disk_key */
2153 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2155 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2156 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2158 #ifdef __LITTLE_ENDIAN
2161 * Optimized helpers for little-endian architectures where CPU and on-disk
2162 * structures have the same endianness and we can skip conversions.
2165 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2166 const struct btrfs_disk_key *disk_key)
2168 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2171 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2172 const struct btrfs_key *cpu_key)
2174 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2177 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2178 struct btrfs_key *cpu_key, int nr)
2180 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2182 btrfs_node_key(eb, disk_key, nr);
2185 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2186 struct btrfs_key *cpu_key, int nr)
2188 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2190 btrfs_item_key(eb, disk_key, nr);
2193 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2194 const struct btrfs_dir_item *item,
2195 struct btrfs_key *cpu_key)
2197 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2199 btrfs_dir_item_key(eb, item, disk_key);
2204 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2205 const struct btrfs_disk_key *disk)
2207 cpu->offset = le64_to_cpu(disk->offset);
2208 cpu->type = disk->type;
2209 cpu->objectid = le64_to_cpu(disk->objectid);
2212 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2213 const struct btrfs_key *cpu)
2215 disk->offset = cpu_to_le64(cpu->offset);
2216 disk->type = cpu->type;
2217 disk->objectid = cpu_to_le64(cpu->objectid);
2220 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2221 struct btrfs_key *key, int nr)
2223 struct btrfs_disk_key disk_key;
2224 btrfs_node_key(eb, &disk_key, nr);
2225 btrfs_disk_key_to_cpu(key, &disk_key);
2228 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2229 struct btrfs_key *key, int nr)
2231 struct btrfs_disk_key disk_key;
2232 btrfs_item_key(eb, &disk_key, nr);
2233 btrfs_disk_key_to_cpu(key, &disk_key);
2236 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2237 const struct btrfs_dir_item *item,
2238 struct btrfs_key *key)
2240 struct btrfs_disk_key disk_key;
2241 btrfs_dir_item_key(eb, item, &disk_key);
2242 btrfs_disk_key_to_cpu(key, &disk_key);
2247 /* struct btrfs_header */
2248 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2249 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2251 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2252 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2253 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2254 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2255 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2257 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2258 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2260 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2262 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2264 return (btrfs_header_flags(eb) & flag) == flag;
2267 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2269 u64 flags = btrfs_header_flags(eb);
2270 btrfs_set_header_flags(eb, flags | flag);
2273 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2275 u64 flags = btrfs_header_flags(eb);
2276 btrfs_set_header_flags(eb, flags & ~flag);
2279 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2281 u64 flags = btrfs_header_flags(eb);
2282 return flags >> BTRFS_BACKREF_REV_SHIFT;
2285 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2288 u64 flags = btrfs_header_flags(eb);
2289 flags &= ~BTRFS_BACKREF_REV_MASK;
2290 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2291 btrfs_set_header_flags(eb, flags);
2294 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2296 return btrfs_header_level(eb) == 0;
2299 /* struct btrfs_root_item */
2300 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2302 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2303 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2304 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2306 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2308 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2309 BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2310 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2311 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2312 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2313 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2314 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2315 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2316 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2318 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2320 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2322 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2324 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2326 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2329 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2331 /* Byte-swap the constant at compile time, root_item::flags is LE */
2332 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2335 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2337 /* Byte-swap the constant at compile time, root_item::flags is LE */
2338 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2341 static inline u64 btrfs_root_id(const struct btrfs_root *root)
2343 return root->root_key.objectid;
2346 /* struct btrfs_root_backup */
2347 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2349 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2351 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2352 tree_root_level, 8);
2354 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2356 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2357 chunk_root_gen, 64);
2358 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2359 chunk_root_level, 8);
2361 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2363 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2364 extent_root_gen, 64);
2365 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2366 extent_root_level, 8);
2368 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2370 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2372 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2375 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2377 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2379 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2382 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2384 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2386 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2387 csum_root_level, 8);
2388 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2390 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2392 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2396 * For extent tree v2 we overload the extent root with the block group root, as
2397 * we will have multiple extent roots.
2399 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root, struct btrfs_root_backup,
2401 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_gen, struct btrfs_root_backup,
2402 extent_root_gen, 64);
2403 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_level,
2404 struct btrfs_root_backup, extent_root_level, 8);
2406 /* struct btrfs_balance_item */
2407 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2409 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2410 const struct btrfs_balance_item *bi,
2411 struct btrfs_disk_balance_args *ba)
2413 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2416 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2417 struct btrfs_balance_item *bi,
2418 const struct btrfs_disk_balance_args *ba)
2420 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2423 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2424 const struct btrfs_balance_item *bi,
2425 struct btrfs_disk_balance_args *ba)
2427 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2430 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2431 struct btrfs_balance_item *bi,
2432 const struct btrfs_disk_balance_args *ba)
2434 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2437 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2438 const struct btrfs_balance_item *bi,
2439 struct btrfs_disk_balance_args *ba)
2441 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2444 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2445 struct btrfs_balance_item *bi,
2446 const struct btrfs_disk_balance_args *ba)
2448 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2452 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2453 const struct btrfs_disk_balance_args *disk)
2455 memset(cpu, 0, sizeof(*cpu));
2457 cpu->profiles = le64_to_cpu(disk->profiles);
2458 cpu->usage = le64_to_cpu(disk->usage);
2459 cpu->devid = le64_to_cpu(disk->devid);
2460 cpu->pstart = le64_to_cpu(disk->pstart);
2461 cpu->pend = le64_to_cpu(disk->pend);
2462 cpu->vstart = le64_to_cpu(disk->vstart);
2463 cpu->vend = le64_to_cpu(disk->vend);
2464 cpu->target = le64_to_cpu(disk->target);
2465 cpu->flags = le64_to_cpu(disk->flags);
2466 cpu->limit = le64_to_cpu(disk->limit);
2467 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2468 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2472 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2473 const struct btrfs_balance_args *cpu)
2475 memset(disk, 0, sizeof(*disk));
2477 disk->profiles = cpu_to_le64(cpu->profiles);
2478 disk->usage = cpu_to_le64(cpu->usage);
2479 disk->devid = cpu_to_le64(cpu->devid);
2480 disk->pstart = cpu_to_le64(cpu->pstart);
2481 disk->pend = cpu_to_le64(cpu->pend);
2482 disk->vstart = cpu_to_le64(cpu->vstart);
2483 disk->vend = cpu_to_le64(cpu->vend);
2484 disk->target = cpu_to_le64(cpu->target);
2485 disk->flags = cpu_to_le64(cpu->flags);
2486 disk->limit = cpu_to_le64(cpu->limit);
2487 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2488 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2491 /* struct btrfs_super_block */
2492 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2493 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2494 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2496 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2497 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2498 struct btrfs_super_block, sys_chunk_array_size, 32);
2499 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2500 struct btrfs_super_block, chunk_root_generation, 64);
2501 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2503 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2505 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2506 chunk_root_level, 8);
2507 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2509 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2511 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2513 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2515 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2517 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2519 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2521 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2522 root_dir_objectid, 64);
2523 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2525 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2527 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2528 compat_ro_flags, 64);
2529 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2530 incompat_flags, 64);
2531 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2533 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2534 cache_generation, 64);
2535 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2536 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2537 uuid_tree_generation, 64);
2538 BTRFS_SETGET_STACK_FUNCS(super_block_group_root, struct btrfs_super_block,
2539 block_group_root, 64);
2540 BTRFS_SETGET_STACK_FUNCS(super_block_group_root_generation,
2541 struct btrfs_super_block,
2542 block_group_root_generation, 64);
2543 BTRFS_SETGET_STACK_FUNCS(super_block_group_root_level, struct btrfs_super_block,
2544 block_group_root_level, 8);
2546 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2547 const char *btrfs_super_csum_name(u16 csum_type);
2548 const char *btrfs_super_csum_driver(u16 csum_type);
2549 size_t __attribute_const__ btrfs_get_num_csums(void);
2553 * The leaf data grows from end-to-front in the node.
2554 * this returns the address of the start of the last item,
2555 * which is the stop of the leaf data stack
2557 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2559 u32 nr = btrfs_header_nritems(leaf);
2562 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2563 return btrfs_item_offset(leaf, nr - 1);
2566 /* struct btrfs_file_extent_item */
2567 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2569 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2570 struct btrfs_file_extent_item, disk_bytenr, 64);
2571 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2572 struct btrfs_file_extent_item, offset, 64);
2573 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2574 struct btrfs_file_extent_item, generation, 64);
2575 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2576 struct btrfs_file_extent_item, num_bytes, 64);
2577 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2578 struct btrfs_file_extent_item, ram_bytes, 64);
2579 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2580 struct btrfs_file_extent_item, disk_num_bytes, 64);
2581 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2582 struct btrfs_file_extent_item, compression, 8);
2584 static inline unsigned long
2585 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2587 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2590 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2592 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2595 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2596 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2598 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2600 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2601 disk_num_bytes, 64);
2602 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2604 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2606 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2608 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2610 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2612 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2613 other_encoding, 16);
2616 * this returns the number of bytes used by the item on disk, minus the
2617 * size of any extent headers. If a file is compressed on disk, this is
2618 * the compressed size
2620 static inline u32 btrfs_file_extent_inline_item_len(
2621 const struct extent_buffer *eb,
2624 return btrfs_item_size(eb, nr) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2627 /* btrfs_qgroup_status_item */
2628 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2630 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2632 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2634 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2637 /* btrfs_qgroup_info_item */
2638 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2640 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2641 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2643 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2644 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2647 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2648 struct btrfs_qgroup_info_item, generation, 64);
2649 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2651 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2652 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2653 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2655 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2656 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2658 /* btrfs_qgroup_limit_item */
2659 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2661 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2663 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2665 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2667 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2670 /* btrfs_dev_replace_item */
2671 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2672 struct btrfs_dev_replace_item, src_devid, 64);
2673 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2674 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2676 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2678 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2680 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2682 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2683 num_write_errors, 64);
2684 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2685 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2687 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2689 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2692 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2693 struct btrfs_dev_replace_item, src_devid, 64);
2694 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2695 struct btrfs_dev_replace_item,
2696 cont_reading_from_srcdev_mode, 64);
2697 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2698 struct btrfs_dev_replace_item, replace_state, 64);
2699 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2700 struct btrfs_dev_replace_item, time_started, 64);
2701 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2702 struct btrfs_dev_replace_item, time_stopped, 64);
2703 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2704 struct btrfs_dev_replace_item, num_write_errors, 64);
2705 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2706 struct btrfs_dev_replace_item,
2707 num_uncorrectable_read_errors, 64);
2708 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2709 struct btrfs_dev_replace_item, cursor_left, 64);
2710 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2711 struct btrfs_dev_replace_item, cursor_right, 64);
2713 /* helper function to cast into the data area of the leaf. */
2714 #define btrfs_item_ptr(leaf, slot, type) \
2715 ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2716 btrfs_item_offset(leaf, slot)))
2718 #define btrfs_item_ptr_offset(leaf, slot) \
2719 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2720 btrfs_item_offset(leaf, slot)))
2722 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2724 return crc32c(crc, address, length);
2727 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2729 put_unaligned_le32(~crc, result);
2732 static inline u64 btrfs_name_hash(const char *name, int len)
2734 return crc32c((u32)~1, name, len);
2738 * Figure the key offset of an extended inode ref
2740 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2743 return (u64) crc32c(parent_objectid, name, len);
2746 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2748 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2753 enum btrfs_inline_ref_type {
2754 BTRFS_REF_TYPE_INVALID,
2755 BTRFS_REF_TYPE_BLOCK,
2756 BTRFS_REF_TYPE_DATA,
2760 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2761 struct btrfs_extent_inline_ref *iref,
2762 enum btrfs_inline_ref_type is_data);
2763 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2765 static inline u8 *btrfs_csum_ptr(const struct btrfs_fs_info *fs_info, u8 *csums,
2768 u64 offset_in_sectors = offset >> fs_info->sectorsize_bits;
2770 return csums + offset_in_sectors * fs_info->csum_size;
2774 * Take the number of bytes to be checksummed and figure out how many leaves
2775 * it would require to store the csums for that many bytes.
2777 static inline u64 btrfs_csum_bytes_to_leaves(
2778 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2780 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2782 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2786 * Use this if we would be adding new items, as we could split nodes as we cow
2789 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2792 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2796 * Doing a truncate or a modification won't result in new nodes or leaves, just
2797 * what we need for COW.
2799 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2802 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2805 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2806 u64 start, u64 num_bytes);
2807 void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2808 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2809 unsigned long count);
2810 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2811 struct btrfs_delayed_ref_root *delayed_refs,
2812 struct btrfs_delayed_ref_head *head);
2813 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2814 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2815 struct btrfs_fs_info *fs_info, u64 bytenr,
2816 u64 offset, int metadata, u64 *refs, u64 *flags);
2817 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2819 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2820 u64 bytenr, u64 num_bytes);
2821 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2822 int btrfs_cross_ref_exist(struct btrfs_root *root,
2823 u64 objectid, u64 offset, u64 bytenr, bool strict,
2824 struct btrfs_path *path);
2825 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2826 struct btrfs_root *root,
2827 u64 parent, u64 root_objectid,
2828 const struct btrfs_disk_key *key,
2829 int level, u64 hint,
2831 enum btrfs_lock_nesting nest);
2832 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2834 struct extent_buffer *buf,
2835 u64 parent, int last_ref);
2836 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2837 struct btrfs_root *root, u64 owner,
2838 u64 offset, u64 ram_bytes,
2839 struct btrfs_key *ins);
2840 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2841 u64 root_objectid, u64 owner, u64 offset,
2842 struct btrfs_key *ins);
2843 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2844 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2845 struct btrfs_key *ins, int is_data, int delalloc);
2846 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2847 struct extent_buffer *buf, int full_backref);
2848 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2849 struct extent_buffer *buf, int full_backref);
2850 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2851 struct extent_buffer *eb, u64 flags, int level);
2852 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2854 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2855 u64 start, u64 len, int delalloc);
2856 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2858 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2859 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2860 struct btrfs_ref *generic_ref);
2862 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2865 * Different levels for to flush space when doing space reservations.
2867 * The higher the level, the more methods we try to reclaim space.
2869 enum btrfs_reserve_flush_enum {
2870 /* If we are in the transaction, we can't flush anything.*/
2871 BTRFS_RESERVE_NO_FLUSH,
2875 * - Running delayed inode items
2876 * - Allocating a new chunk
2878 BTRFS_RESERVE_FLUSH_LIMIT,
2882 * - Running delayed inode items
2883 * - Running delayed refs
2884 * - Running delalloc and waiting for ordered extents
2885 * - Allocating a new chunk
2887 BTRFS_RESERVE_FLUSH_EVICT,
2890 * Flush space by above mentioned methods and by:
2891 * - Running delayed iputs
2892 * - Committing transaction
2894 * Can be interrupted by a fatal signal.
2896 BTRFS_RESERVE_FLUSH_DATA,
2897 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2898 BTRFS_RESERVE_FLUSH_ALL,
2901 * Pretty much the same as FLUSH_ALL, but can also steal space from
2904 * Can be interrupted by a fatal signal.
2906 BTRFS_RESERVE_FLUSH_ALL_STEAL,
2909 enum btrfs_flush_state {
2910 FLUSH_DELAYED_ITEMS_NR = 1,
2911 FLUSH_DELAYED_ITEMS = 2,
2912 FLUSH_DELAYED_REFS_NR = 3,
2913 FLUSH_DELAYED_REFS = 4,
2915 FLUSH_DELALLOC_WAIT = 6,
2916 FLUSH_DELALLOC_FULL = 7,
2918 ALLOC_CHUNK_FORCE = 9,
2919 RUN_DELAYED_IPUTS = 10,
2923 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2924 struct btrfs_block_rsv *rsv,
2925 int nitems, bool use_global_rsv);
2926 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2927 struct btrfs_block_rsv *rsv);
2928 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2930 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes,
2931 u64 disk_num_bytes, bool noflush);
2932 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2933 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2934 u64 start, u64 end);
2935 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2936 u64 num_bytes, u64 *actual_bytes);
2937 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2939 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2940 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2941 struct btrfs_fs_info *fs_info);
2942 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2943 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2944 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2947 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2949 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2950 int btrfs_previous_item(struct btrfs_root *root,
2951 struct btrfs_path *path, u64 min_objectid,
2953 int btrfs_previous_extent_item(struct btrfs_root *root,
2954 struct btrfs_path *path, u64 min_objectid);
2955 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2956 struct btrfs_path *path,
2957 const struct btrfs_key *new_key);
2958 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2959 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2960 struct btrfs_key *key, int lowest_level,
2962 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2963 struct btrfs_path *path,
2965 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2968 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2969 struct btrfs_root *root, struct extent_buffer *buf,
2970 struct extent_buffer *parent, int parent_slot,
2971 struct extent_buffer **cow_ret,
2972 enum btrfs_lock_nesting nest);
2973 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2974 struct btrfs_root *root,
2975 struct extent_buffer *buf,
2976 struct extent_buffer **cow_ret, u64 new_root_objectid);
2977 int btrfs_block_can_be_shared(struct btrfs_root *root,
2978 struct extent_buffer *buf);
2979 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2980 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2981 int btrfs_split_item(struct btrfs_trans_handle *trans,
2982 struct btrfs_root *root,
2983 struct btrfs_path *path,
2984 const struct btrfs_key *new_key,
2985 unsigned long split_offset);
2986 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2987 struct btrfs_root *root,
2988 struct btrfs_path *path,
2989 const struct btrfs_key *new_key);
2990 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2991 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2992 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2993 const struct btrfs_key *key, struct btrfs_path *p,
2994 int ins_len, int cow);
2995 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2996 struct btrfs_path *p, u64 time_seq);
2997 int btrfs_search_slot_for_read(struct btrfs_root *root,
2998 const struct btrfs_key *key,
2999 struct btrfs_path *p, int find_higher,
3001 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
3002 struct btrfs_root *root, struct extent_buffer *parent,
3003 int start_slot, u64 *last_ret,
3004 struct btrfs_key *progress);
3005 void btrfs_release_path(struct btrfs_path *p);
3006 struct btrfs_path *btrfs_alloc_path(void);
3007 void btrfs_free_path(struct btrfs_path *p);
3009 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3010 struct btrfs_path *path, int slot, int nr);
3011 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
3012 struct btrfs_root *root,
3013 struct btrfs_path *path)
3015 return btrfs_del_items(trans, root, path, path->slots[0], 1);
3019 * Describes a batch of items to insert in a btree. This is used by
3020 * btrfs_insert_empty_items().
3022 struct btrfs_item_batch {
3024 * Pointer to an array containing the keys of the items to insert (in
3027 const struct btrfs_key *keys;
3028 /* Pointer to an array containing the data size for each item to insert. */
3029 const u32 *data_sizes;
3031 * The sum of data sizes for all items. The caller can compute this while
3032 * setting up the data_sizes array, so it ends up being more efficient
3033 * than having btrfs_insert_empty_items() or setup_item_for_insert()
3034 * doing it, as it would avoid an extra loop over a potentially large
3035 * array, and in the case of setup_item_for_insert(), we would be doing
3036 * it while holding a write lock on a leaf and often on upper level nodes
3037 * too, unnecessarily increasing the size of a critical section.
3039 u32 total_data_size;
3040 /* Size of the keys and data_sizes arrays (number of items in the batch). */
3044 void btrfs_setup_item_for_insert(struct btrfs_root *root,
3045 struct btrfs_path *path,
3046 const struct btrfs_key *key,
3048 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3049 const struct btrfs_key *key, void *data, u32 data_size);
3050 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3051 struct btrfs_root *root,
3052 struct btrfs_path *path,
3053 const struct btrfs_item_batch *batch);
3055 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3056 struct btrfs_root *root,
3057 struct btrfs_path *path,
3058 const struct btrfs_key *key,
3061 struct btrfs_item_batch batch;
3064 batch.data_sizes = &data_size;
3065 batch.total_data_size = data_size;
3068 return btrfs_insert_empty_items(trans, root, path, &batch);
3071 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3072 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3075 int btrfs_search_backwards(struct btrfs_root *root, struct btrfs_key *key,
3076 struct btrfs_path *path);
3078 int btrfs_get_next_valid_item(struct btrfs_root *root, struct btrfs_key *key,
3079 struct btrfs_path *path);
3082 * Search in @root for a given @key, and store the slot found in @found_key.
3084 * @root: The root node of the tree.
3085 * @key: The key we are looking for.
3086 * @found_key: Will hold the found item.
3087 * @path: Holds the current slot/leaf.
3088 * @iter_ret: Contains the value returned from btrfs_search_slot or
3089 * btrfs_get_next_valid_item, whichever was executed last.
3091 * The @iter_ret is an output variable that will contain the return value of
3092 * btrfs_search_slot, if it encountered an error, or the value returned from
3093 * btrfs_get_next_valid_item otherwise. That return value can be 0, if a valid
3094 * slot was found, 1 if there were no more leaves, and <0 if there was an error.
3096 * It's recommended to use a separate variable for iter_ret and then use it to
3097 * set the function return value so there's no confusion of the 0/1/errno
3098 * values stemming from btrfs_search_slot.
3100 #define btrfs_for_each_slot(root, key, found_key, path, iter_ret) \
3101 for (iter_ret = btrfs_search_slot(NULL, (root), (key), (path), 0, 0); \
3102 (iter_ret) >= 0 && \
3103 (iter_ret = btrfs_get_next_valid_item((root), (found_key), (path))) == 0; \
3104 (path)->slots[0]++ \
3107 static inline int btrfs_next_old_item(struct btrfs_root *root,
3108 struct btrfs_path *p, u64 time_seq)
3111 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3112 return btrfs_next_old_leaf(root, p, time_seq);
3117 * Search the tree again to find a leaf with greater keys.
3119 * Returns 0 if it found something or 1 if there are no greater leaves.
3120 * Returns < 0 on error.
3122 static inline int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
3124 return btrfs_next_old_leaf(root, path, 0);
3127 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3129 return btrfs_next_old_item(root, p, 0);
3131 int btrfs_leaf_free_space(struct extent_buffer *leaf);
3132 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
3134 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3135 struct btrfs_root *root,
3136 struct extent_buffer *node,
3137 struct extent_buffer *parent);
3138 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3141 * Do it this way so we only ever do one test_bit in the normal case.
3143 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
3144 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
3152 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3153 * anything except sleeping. This function is used to check the status of
3155 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
3156 * since setting and checking for SB_RDONLY in the superblock's flags is not
3159 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
3161 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
3162 btrfs_fs_closing(fs_info);
3165 static inline void btrfs_set_sb_rdonly(struct super_block *sb)
3167 sb->s_flags |= SB_RDONLY;
3168 set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3171 static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
3173 sb->s_flags &= ~SB_RDONLY;
3174 clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3178 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3179 u64 ref_id, u64 dirid, u64 sequence, const char *name,
3181 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3182 u64 ref_id, u64 dirid, u64 *sequence, const char *name,
3184 int btrfs_del_root(struct btrfs_trans_handle *trans,
3185 const struct btrfs_key *key);
3186 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3187 const struct btrfs_key *key,
3188 struct btrfs_root_item *item);
3189 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3190 struct btrfs_root *root,
3191 struct btrfs_key *key,
3192 struct btrfs_root_item *item);
3193 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3194 struct btrfs_path *path, struct btrfs_root_item *root_item,
3195 struct btrfs_key *root_key);
3196 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3197 void btrfs_set_root_node(struct btrfs_root_item *item,
3198 struct extent_buffer *node);
3199 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3200 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3201 struct btrfs_root *root);
3204 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3206 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3208 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3211 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3212 const char *name, int name_len);
3213 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3214 int name_len, struct btrfs_inode *dir,
3215 struct btrfs_key *location, u8 type, u64 index);
3216 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3217 struct btrfs_root *root,
3218 struct btrfs_path *path, u64 dir,
3219 const char *name, int name_len,
3221 struct btrfs_dir_item *
3222 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3223 struct btrfs_root *root,
3224 struct btrfs_path *path, u64 dir,
3225 u64 index, const char *name, int name_len,
3227 struct btrfs_dir_item *
3228 btrfs_search_dir_index_item(struct btrfs_root *root,
3229 struct btrfs_path *path, u64 dirid,
3230 const char *name, int name_len);
3231 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3232 struct btrfs_root *root,
3233 struct btrfs_path *path,
3234 struct btrfs_dir_item *di);
3235 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3236 struct btrfs_root *root,
3237 struct btrfs_path *path, u64 objectid,
3238 const char *name, u16 name_len,
3239 const void *data, u16 data_len);
3240 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3241 struct btrfs_root *root,
3242 struct btrfs_path *path, u64 dir,
3243 const char *name, u16 name_len,
3245 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3246 struct btrfs_path *path,
3251 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3252 struct btrfs_root *root, u64 offset);
3253 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3254 struct btrfs_root *root, u64 offset);
3255 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3258 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3259 struct btrfs_root *root, u64 bytenr, u64 len);
3260 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3261 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3262 struct btrfs_root *root,
3263 u64 objectid, u64 pos,
3264 u64 disk_offset, u64 disk_num_bytes,
3265 u64 num_bytes, u64 offset, u64 ram_bytes,
3266 u8 compression, u8 encryption, u16 other_encoding);
3267 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3268 struct btrfs_root *root,
3269 struct btrfs_path *path, u64 objectid,
3270 u64 bytenr, int mod);
3271 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3272 struct btrfs_root *root,
3273 struct btrfs_ordered_sum *sums);
3274 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3275 u64 offset, bool one_ordered);
3276 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3277 struct list_head *list, int search_commit);
3278 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3279 const struct btrfs_path *path,
3280 struct btrfs_file_extent_item *fi,
3281 const bool new_inline,
3282 struct extent_map *em);
3283 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3285 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3287 void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3288 u64 btrfs_file_extent_end(const struct btrfs_path *path);
3291 void btrfs_submit_data_write_bio(struct inode *inode, struct bio *bio, int mirror_num);
3292 void btrfs_submit_data_read_bio(struct inode *inode, struct bio *bio,
3293 int mirror_num, enum btrfs_compression_type compress_type);
3294 int btrfs_check_sector_csum(struct btrfs_fs_info *fs_info, struct page *page,
3295 u32 pgoff, u8 *csum, const u8 * const csum_expected);
3296 int btrfs_check_data_csum(struct inode *inode, struct btrfs_bio *bbio,
3297 u32 bio_offset, struct page *page, u32 pgoff);
3298 unsigned int btrfs_verify_data_csum(struct btrfs_bio *bbio,
3299 u32 bio_offset, struct page *page,
3300 u64 start, u64 end);
3301 int btrfs_check_data_csum(struct inode *inode, struct btrfs_bio *bbio,
3302 u32 bio_offset, struct page *page, u32 pgoff);
3303 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3304 u64 start, u64 len);
3305 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3306 u64 *orig_start, u64 *orig_block_len,
3307 u64 *ram_bytes, bool strict);
3309 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3310 struct btrfs_inode *inode);
3311 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3312 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3313 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3314 struct btrfs_inode *dir, struct btrfs_inode *inode,
3315 const char *name, int name_len);
3316 int btrfs_add_link(struct btrfs_trans_handle *trans,
3317 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3318 const char *name, int name_len, int add_backref, u64 index);
3319 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3320 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3323 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3324 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3325 bool in_reclaim_context);
3326 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3327 unsigned int extra_bits,
3328 struct extent_state **cached_state);
3329 struct btrfs_new_inode_args {
3332 struct dentry *dentry;
3333 struct inode *inode;
3338 * Output from btrfs_new_inode_prepare(), input to
3339 * btrfs_create_new_inode().
3341 struct posix_acl *default_acl;
3342 struct posix_acl *acl;
3344 int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args,
3345 unsigned int *trans_num_items);
3346 int btrfs_create_new_inode(struct btrfs_trans_handle *trans,
3347 struct btrfs_new_inode_args *args);
3348 void btrfs_new_inode_args_destroy(struct btrfs_new_inode_args *args);
3349 struct inode *btrfs_new_subvol_inode(struct user_namespace *mnt_userns,
3351 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3353 void btrfs_clear_delalloc_extent(struct inode *inode,
3354 struct extent_state *state, u32 bits);
3355 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3356 struct extent_state *other);
3357 void btrfs_split_delalloc_extent(struct inode *inode,
3358 struct extent_state *orig, u64 split);
3359 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3360 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3361 void btrfs_evict_inode(struct inode *inode);
3362 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3363 struct inode *btrfs_alloc_inode(struct super_block *sb);
3364 void btrfs_destroy_inode(struct inode *inode);
3365 void btrfs_free_inode(struct inode *inode);
3366 int btrfs_drop_inode(struct inode *inode);
3367 int __init btrfs_init_cachep(void);
3368 void __cold btrfs_destroy_cachep(void);
3369 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3370 struct btrfs_root *root, struct btrfs_path *path);
3371 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3372 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3373 struct page *page, size_t pg_offset,
3374 u64 start, u64 end);
3375 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3376 struct btrfs_root *root, struct btrfs_inode *inode);
3377 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3378 struct btrfs_root *root, struct btrfs_inode *inode);
3379 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3380 struct btrfs_inode *inode);
3381 int btrfs_orphan_cleanup(struct btrfs_root *root);
3382 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3383 void btrfs_add_delayed_iput(struct inode *inode);
3384 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3385 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3386 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3387 u64 start, u64 num_bytes, u64 min_size,
3388 loff_t actual_len, u64 *alloc_hint);
3389 int btrfs_prealloc_file_range_trans(struct inode *inode,
3390 struct btrfs_trans_handle *trans, int mode,
3391 u64 start, u64 num_bytes, u64 min_size,
3392 loff_t actual_len, u64 *alloc_hint);
3393 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3394 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3395 struct writeback_control *wbc);
3396 int btrfs_writepage_cow_fixup(struct page *page);
3397 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3398 struct page *page, u64 start,
3399 u64 end, bool uptodate);
3400 int btrfs_encoded_io_compression_from_extent(struct btrfs_fs_info *fs_info,
3402 int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
3403 u64 file_offset, u64 disk_bytenr,
3405 struct page **pages);
3406 ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter,
3407 struct btrfs_ioctl_encoded_io_args *encoded);
3408 ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
3409 const struct btrfs_ioctl_encoded_io_args *encoded);
3411 ssize_t btrfs_dio_rw(struct kiocb *iocb, struct iov_iter *iter, size_t done_before);
3413 extern const struct dentry_operations btrfs_dentry_operations;
3415 /* Inode locking type flags, by default the exclusive lock is taken */
3416 #define BTRFS_ILOCK_SHARED (1U << 0)
3417 #define BTRFS_ILOCK_TRY (1U << 1)
3418 #define BTRFS_ILOCK_MMAP (1U << 2)
3420 int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3421 void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3422 void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3423 const u64 add_bytes,
3424 const u64 del_bytes);
3425 void btrfs_assert_inode_range_clean(struct btrfs_inode *inode, u64 start, u64 end);
3428 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3429 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3430 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3431 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3432 struct dentry *dentry, struct fileattr *fa);
3433 int btrfs_ioctl_get_supported_features(void __user *arg);
3434 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3435 int __pure btrfs_is_empty_uuid(u8 *uuid);
3436 int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
3437 struct btrfs_ioctl_defrag_range_args *range,
3438 u64 newer_than, unsigned long max_to_defrag);
3439 void btrfs_get_block_group_info(struct list_head *groups_list,
3440 struct btrfs_ioctl_space_info *space);
3441 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3442 struct btrfs_ioctl_balance_args *bargs);
3443 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3444 enum btrfs_exclusive_operation type);
3445 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3446 enum btrfs_exclusive_operation type);
3447 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3448 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3449 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
3450 enum btrfs_exclusive_operation op);
3454 int __init btrfs_auto_defrag_init(void);
3455 void __cold btrfs_auto_defrag_exit(void);
3456 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3457 struct btrfs_inode *inode, u32 extent_thresh);
3458 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3459 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3460 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3461 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3463 extern const struct file_operations btrfs_file_operations;
3464 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3465 struct btrfs_root *root, struct btrfs_inode *inode,
3466 struct btrfs_drop_extents_args *args);
3467 int btrfs_replace_file_extents(struct btrfs_inode *inode,
3468 struct btrfs_path *path, const u64 start,
3470 struct btrfs_replace_extent_info *extent_info,
3471 struct btrfs_trans_handle **trans_out);
3472 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3473 struct btrfs_inode *inode, u64 start, u64 end);
3474 ssize_t btrfs_do_write_iter(struct kiocb *iocb, struct iov_iter *from,
3475 const struct btrfs_ioctl_encoded_io_args *encoded);
3476 int btrfs_release_file(struct inode *inode, struct file *file);
3477 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3478 size_t num_pages, loff_t pos, size_t write_bytes,
3479 struct extent_state **cached, bool noreserve);
3480 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3481 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3482 size_t *write_bytes);
3483 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3486 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3487 struct btrfs_root *root);
3490 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3491 unsigned long new_flags);
3492 int btrfs_sync_fs(struct super_block *sb, int wait);
3493 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3494 u64 subvol_objectid);
3496 static inline __printf(2, 3) __cold
3497 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3501 #ifdef CONFIG_PRINTK_INDEX
3503 #define btrfs_printk(fs_info, fmt, args...) \
3505 printk_index_subsys_emit("%sBTRFS %s (device %s): ", NULL, fmt); \
3506 _btrfs_printk(fs_info, fmt, ##args); \
3511 void _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3513 #elif defined(CONFIG_PRINTK)
3515 #define btrfs_printk(fs_info, fmt, args...) \
3516 _btrfs_printk(fs_info, fmt, ##args)
3520 void _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3524 #define btrfs_printk(fs_info, fmt, args...) \
3525 btrfs_no_printk(fs_info, fmt, ##args)
3528 #define btrfs_emerg(fs_info, fmt, args...) \
3529 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3530 #define btrfs_alert(fs_info, fmt, args...) \
3531 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3532 #define btrfs_crit(fs_info, fmt, args...) \
3533 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3534 #define btrfs_err(fs_info, fmt, args...) \
3535 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3536 #define btrfs_warn(fs_info, fmt, args...) \
3537 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3538 #define btrfs_notice(fs_info, fmt, args...) \
3539 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3540 #define btrfs_info(fs_info, fmt, args...) \
3541 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3544 * Wrappers that use printk_in_rcu
3546 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3547 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3548 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3549 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3550 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3551 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3552 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3553 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3554 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3555 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3556 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3557 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3558 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3559 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3562 * Wrappers that use a ratelimited printk_in_rcu
3564 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3565 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3566 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3567 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3568 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3569 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3570 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3571 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3572 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3573 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3574 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3575 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3576 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3577 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3580 * Wrappers that use a ratelimited printk
3582 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3583 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3584 #define btrfs_alert_rl(fs_info, fmt, args...) \
3585 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3586 #define btrfs_crit_rl(fs_info, fmt, args...) \
3587 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3588 #define btrfs_err_rl(fs_info, fmt, args...) \
3589 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3590 #define btrfs_warn_rl(fs_info, fmt, args...) \
3591 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3592 #define btrfs_notice_rl(fs_info, fmt, args...) \
3593 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3594 #define btrfs_info_rl(fs_info, fmt, args...) \
3595 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3597 #if defined(CONFIG_DYNAMIC_DEBUG)
3598 #define btrfs_debug(fs_info, fmt, args...) \
3599 _dynamic_func_call_no_desc(fmt, btrfs_printk, \
3600 fs_info, KERN_DEBUG fmt, ##args)
3601 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3602 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \
3603 fs_info, KERN_DEBUG fmt, ##args)
3604 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3605 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \
3606 fs_info, KERN_DEBUG fmt, ##args)
3607 #define btrfs_debug_rl(fs_info, fmt, args...) \
3608 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \
3609 fs_info, KERN_DEBUG fmt, ##args)
3610 #elif defined(DEBUG)
3611 #define btrfs_debug(fs_info, fmt, args...) \
3612 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3613 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3614 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3615 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3616 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3617 #define btrfs_debug_rl(fs_info, fmt, args...) \
3618 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3620 #define btrfs_debug(fs_info, fmt, args...) \
3621 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3622 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3623 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3624 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3625 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3626 #define btrfs_debug_rl(fs_info, fmt, args...) \
3627 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3630 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3633 btrfs_printk(fs_info, fmt, ##args); \
3634 rcu_read_unlock(); \
3637 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \
3640 btrfs_no_printk(fs_info, fmt, ##args); \
3641 rcu_read_unlock(); \
3644 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3646 static DEFINE_RATELIMIT_STATE(_rs, \
3647 DEFAULT_RATELIMIT_INTERVAL, \
3648 DEFAULT_RATELIMIT_BURST); \
3649 if (__ratelimit(&_rs)) \
3650 btrfs_printk(fs_info, fmt, ##args); \
3653 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3656 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3657 rcu_read_unlock(); \
3660 #ifdef CONFIG_BTRFS_ASSERT
3662 static inline void assertfail(const char *expr, const char *file, int line)
3664 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3668 #define ASSERT(expr) \
3669 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3672 static inline void assertfail(const char *expr, const char* file, int line) { }
3673 #define ASSERT(expr) (void)(expr)
3676 #if BITS_PER_LONG == 32
3677 #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3679 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3680 * addresses of extents.
3682 * For 4K page size it's about 10T, for 64K it's 160T.
3684 #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3685 void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3686 void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3690 * Get the correct offset inside the page of extent buffer.
3692 * @eb: target extent buffer
3693 * @start: offset inside the extent buffer
3695 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3697 static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3698 unsigned long offset)
3701 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3702 * to PAGE_SIZE, thus adding it won't cause any difference.
3704 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3705 * to the eb, thus we have to take the eb->start into consideration.
3707 return offset_in_page(offset + eb->start);
3710 static inline unsigned long get_eb_page_index(unsigned long offset)
3713 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3715 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3716 * and have ensured that all tree blocks are contained in one page,
3717 * thus we always get index == 0.
3719 return offset >> PAGE_SHIFT;
3723 * Use that for functions that are conditionally exported for sanity tests but
3726 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3727 #define EXPORT_FOR_TESTS static
3729 #define EXPORT_FOR_TESTS
3733 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3736 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3741 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3742 unsigned int line, int errno, const char *fmt, ...);
3744 const char * __attribute_const__ btrfs_decode_error(int errno);
3747 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3748 const char *function,
3749 unsigned int line, int errno);
3752 * Call btrfs_abort_transaction as early as possible when an error condition is
3753 * detected, that way the exact line number is reported.
3755 #define btrfs_abort_transaction(trans, errno) \
3757 /* Report first abort since mount */ \
3758 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3759 &((trans)->fs_info->fs_state))) { \
3760 if ((errno) != -EIO && (errno) != -EROFS) { \
3761 WARN(1, KERN_DEBUG \
3762 "BTRFS: Transaction aborted (error %d)\n", \
3765 btrfs_debug((trans)->fs_info, \
3766 "Transaction aborted (error %d)", \
3770 __btrfs_abort_transaction((trans), __func__, \
3771 __LINE__, (errno)); \
3774 #ifdef CONFIG_PRINTK_INDEX
3776 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3778 printk_index_subsys_emit( \
3779 "BTRFS: error (device %s%s) in %s:%d: errno=%d %s", \
3781 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3782 (errno), fmt, ##args); \
3787 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3788 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3789 (errno), fmt, ##args)
3793 #define BTRFS_FS_ERROR(fs_info) (unlikely(test_bit(BTRFS_FS_STATE_ERROR, \
3794 &(fs_info)->fs_state)))
3795 #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \
3796 (unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \
3797 &(fs_info)->fs_state)))
3801 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3802 unsigned int line, int errno, const char *fmt, ...);
3804 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3805 * will panic(). Otherwise we BUG() here.
3807 #define btrfs_panic(fs_info, errno, fmt, args...) \
3809 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3814 /* compatibility and incompatibility defines */
3816 #define btrfs_set_fs_incompat(__fs_info, opt) \
3817 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3820 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3821 u64 flag, const char* name)
3823 struct btrfs_super_block *disk_super;
3826 disk_super = fs_info->super_copy;
3827 features = btrfs_super_incompat_flags(disk_super);
3828 if (!(features & flag)) {
3829 spin_lock(&fs_info->super_lock);
3830 features = btrfs_super_incompat_flags(disk_super);
3831 if (!(features & flag)) {
3833 btrfs_set_super_incompat_flags(disk_super, features);
3835 "setting incompat feature flag for %s (0x%llx)",
3838 spin_unlock(&fs_info->super_lock);
3842 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3843 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3846 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3847 u64 flag, const char* name)
3849 struct btrfs_super_block *disk_super;
3852 disk_super = fs_info->super_copy;
3853 features = btrfs_super_incompat_flags(disk_super);
3854 if (features & flag) {
3855 spin_lock(&fs_info->super_lock);
3856 features = btrfs_super_incompat_flags(disk_super);
3857 if (features & flag) {
3859 btrfs_set_super_incompat_flags(disk_super, features);
3861 "clearing incompat feature flag for %s (0x%llx)",
3864 spin_unlock(&fs_info->super_lock);
3868 #define btrfs_fs_incompat(fs_info, opt) \
3869 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3871 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3873 struct btrfs_super_block *disk_super;
3874 disk_super = fs_info->super_copy;
3875 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3878 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3879 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3882 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3883 u64 flag, const char *name)
3885 struct btrfs_super_block *disk_super;
3888 disk_super = fs_info->super_copy;
3889 features = btrfs_super_compat_ro_flags(disk_super);
3890 if (!(features & flag)) {
3891 spin_lock(&fs_info->super_lock);
3892 features = btrfs_super_compat_ro_flags(disk_super);
3893 if (!(features & flag)) {
3895 btrfs_set_super_compat_ro_flags(disk_super, features);
3897 "setting compat-ro feature flag for %s (0x%llx)",
3900 spin_unlock(&fs_info->super_lock);
3904 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3905 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3908 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3909 u64 flag, const char *name)
3911 struct btrfs_super_block *disk_super;
3914 disk_super = fs_info->super_copy;
3915 features = btrfs_super_compat_ro_flags(disk_super);
3916 if (features & flag) {
3917 spin_lock(&fs_info->super_lock);
3918 features = btrfs_super_compat_ro_flags(disk_super);
3919 if (features & flag) {
3921 btrfs_set_super_compat_ro_flags(disk_super, features);
3923 "clearing compat-ro feature flag for %s (0x%llx)",
3926 spin_unlock(&fs_info->super_lock);
3930 #define btrfs_fs_compat_ro(fs_info, opt) \
3931 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3933 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3935 struct btrfs_super_block *disk_super;
3936 disk_super = fs_info->super_copy;
3937 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3941 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3942 struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu);
3943 int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3944 struct posix_acl *acl, int type);
3945 int __btrfs_set_acl(struct btrfs_trans_handle *trans, struct inode *inode,
3946 struct posix_acl *acl, int type);
3948 #define btrfs_get_acl NULL
3949 #define btrfs_set_acl NULL
3950 static inline int __btrfs_set_acl(struct btrfs_trans_handle *trans,
3951 struct inode *inode, struct posix_acl *acl,
3959 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3960 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3961 struct btrfs_root *root);
3962 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3963 struct btrfs_root *root);
3964 int btrfs_recover_relocation(struct btrfs_fs_info *fs_info);
3965 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3966 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3967 struct btrfs_root *root, struct extent_buffer *buf,
3968 struct extent_buffer *cow);
3969 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3970 u64 *bytes_to_reserve);
3971 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3972 struct btrfs_pending_snapshot *pending);
3973 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3974 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3976 int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3979 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3980 u64 end, struct btrfs_scrub_progress *progress,
3981 int readonly, int is_dev_replace);
3982 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3983 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3984 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3985 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3986 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3987 struct btrfs_scrub_progress *progress);
3988 static inline void btrfs_init_full_stripe_locks_tree(
3989 struct btrfs_full_stripe_locks_tree *locks_root)
3991 locks_root->root = RB_ROOT;
3992 mutex_init(&locks_root->lock);
3996 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3997 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3998 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
4000 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
4002 btrfs_bio_counter_sub(fs_info, 1);
4005 static inline int is_fstree(u64 rootid)
4007 if (rootid == BTRFS_FS_TREE_OBJECTID ||
4008 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
4009 !btrfs_qgroup_level(rootid)))
4014 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
4016 return signal_pending(current);
4020 #ifdef CONFIG_FS_VERITY
4022 extern const struct fsverity_operations btrfs_verityops;
4023 int btrfs_drop_verity_items(struct btrfs_inode *inode);
4025 BTRFS_SETGET_FUNCS(verity_descriptor_encryption, struct btrfs_verity_descriptor_item,
4027 BTRFS_SETGET_FUNCS(verity_descriptor_size, struct btrfs_verity_descriptor_item,
4029 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_encryption,
4030 struct btrfs_verity_descriptor_item, encryption, 8);
4031 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_size,
4032 struct btrfs_verity_descriptor_item, size, 64);
4036 static inline int btrfs_drop_verity_items(struct btrfs_inode *inode)
4043 /* Sanity test specific functions */
4044 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4045 void btrfs_test_destroy_inode(struct inode *inode);
4046 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
4048 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
4051 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
4057 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
4059 return fs_info->zone_size > 0;
4063 * Count how many fs_info->max_extent_size cover the @size
4065 static inline u32 count_max_extents(struct btrfs_fs_info *fs_info, u64 size)
4067 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4069 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
4072 return div_u64(size + fs_info->max_extent_size - 1, fs_info->max_extent_size);
4075 static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root)
4077 return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;
4081 * We use page status Private2 to indicate there is an ordered extent with
4084 * Rename the Private2 accessors to Ordered, to improve readability.
4086 #define PageOrdered(page) PagePrivate2(page)
4087 #define SetPageOrdered(page) SetPagePrivate2(page)
4088 #define ClearPageOrdered(page) ClearPagePrivate2(page)
4089 #define folio_test_ordered(folio) folio_test_private_2(folio)
4090 #define folio_set_ordered(folio) folio_set_private_2(folio)
4091 #define folio_clear_ordered(folio) folio_clear_private_2(folio)