1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2007 Oracle. All rights reserved.
10 #include <linux/sched/signal.h>
11 #include <linux/highmem.h>
13 #include <linux/rwsem.h>
14 #include <linux/semaphore.h>
15 #include <linux/completion.h>
16 #include <linux/backing-dev.h>
17 #include <linux/wait.h>
18 #include <linux/slab.h>
19 #include <trace/events/btrfs.h>
20 #include <asm/unaligned.h>
21 #include <linux/pagemap.h>
22 #include <linux/btrfs.h>
23 #include <linux/btrfs_tree.h>
24 #include <linux/workqueue.h>
25 #include <linux/security.h>
26 #include <linux/sizes.h>
27 #include <linux/dynamic_debug.h>
28 #include <linux/refcount.h>
29 #include <linux/crc32c.h>
30 #include <linux/iomap.h>
31 #include "extent-io-tree.h"
32 #include "extent_io.h"
33 #include "extent_map.h"
34 #include "async-thread.h"
35 #include "block-rsv.h"
38 struct btrfs_trans_handle;
39 struct btrfs_transaction;
40 struct btrfs_pending_snapshot;
41 struct btrfs_delayed_ref_root;
42 struct btrfs_space_info;
43 struct btrfs_block_group;
44 extern struct kmem_cache *btrfs_trans_handle_cachep;
45 extern struct kmem_cache *btrfs_bit_radix_cachep;
46 extern struct kmem_cache *btrfs_path_cachep;
47 extern struct kmem_cache *btrfs_free_space_cachep;
48 extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
49 struct btrfs_ordered_sum;
52 struct btrfs_ioctl_encoded_io_args;
54 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
57 * Maximum number of mirrors that can be available for all profiles counting
58 * the target device of dev-replace as one. During an active device replace
59 * procedure, the target device of the copy operation is a mirror for the
60 * filesystem data as well that can be used to read data in order to repair
61 * read errors on other disks.
63 * Current value is derived from RAID1C4 with 4 copies.
65 #define BTRFS_MAX_MIRRORS (4 + 1)
67 #define BTRFS_MAX_LEVEL 8
69 #define BTRFS_OLDEST_GENERATION 0ULL
72 * we can actually store much bigger names, but lets not confuse the rest
75 #define BTRFS_NAME_LEN 255
78 * Theoretical limit is larger, but we keep this down to a sane
79 * value. That should limit greatly the possibility of collisions on
82 #define BTRFS_LINK_MAX 65535U
84 #define BTRFS_EMPTY_DIR_SIZE 0
86 /* ioprio of readahead is set to idle */
87 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
89 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M
92 * Use large batch size to reduce overhead of metadata updates. On the reader
93 * side, we only read it when we are close to ENOSPC and the read overhead is
94 * mostly related to the number of CPUs, so it is OK to use arbitrary large
97 #define BTRFS_TOTAL_BYTES_PINNED_BATCH SZ_128M
99 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
102 * Deltas are an effective way to populate global statistics. Give macro names
103 * to make it clear what we're doing. An example is discard_extents in
104 * btrfs_free_space_ctl.
106 #define BTRFS_STAT_NR_ENTRIES 2
107 #define BTRFS_STAT_CURR 0
108 #define BTRFS_STAT_PREV 1
111 * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
113 static inline u32 count_max_extents(u64 size)
115 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
118 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
120 BUG_ON(num_stripes == 0);
121 return sizeof(struct btrfs_chunk) +
122 sizeof(struct btrfs_stripe) * (num_stripes - 1);
126 * Runtime (in-memory) states of filesystem
129 /* Global indicator of serious filesystem errors */
130 BTRFS_FS_STATE_ERROR,
132 * Filesystem is being remounted, allow to skip some operations, like
135 BTRFS_FS_STATE_REMOUNTING,
136 /* Filesystem in RO mode */
138 /* Track if a transaction abort has been reported on this filesystem */
139 BTRFS_FS_STATE_TRANS_ABORTED,
141 * Bio operations should be blocked on this filesystem because a source
142 * or target device is being destroyed as part of a device replace
144 BTRFS_FS_STATE_DEV_REPLACING,
145 /* The btrfs_fs_info created for self-tests */
146 BTRFS_FS_STATE_DUMMY_FS_INFO,
148 BTRFS_FS_STATE_NO_CSUMS,
150 /* Indicates there was an error cleaning up a log tree. */
151 BTRFS_FS_STATE_LOG_CLEANUP_ERROR,
154 #define BTRFS_BACKREF_REV_MAX 256
155 #define BTRFS_BACKREF_REV_SHIFT 56
156 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
157 BTRFS_BACKREF_REV_SHIFT)
159 #define BTRFS_OLD_BACKREF_REV 0
160 #define BTRFS_MIXED_BACKREF_REV 1
163 * every tree block (leaf or node) starts with this header.
165 struct btrfs_header {
166 /* these first four must match the super block */
167 u8 csum[BTRFS_CSUM_SIZE];
168 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
169 __le64 bytenr; /* which block this node is supposed to live in */
172 /* allowed to be different from the super from here on down */
173 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
178 } __attribute__ ((__packed__));
181 * this is a very generous portion of the super block, giving us
182 * room to translate 14 chunks with 3 stripes each.
184 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
187 * just in case we somehow lose the roots and are not able to mount,
188 * we store an array of the roots from previous transactions
191 #define BTRFS_NUM_BACKUP_ROOTS 4
192 struct btrfs_root_backup {
194 __le64 tree_root_gen;
197 __le64 chunk_root_gen;
200 __le64 extent_root_gen;
209 __le64 csum_root_gen;
219 u8 extent_root_level;
223 /* future and to align */
225 } __attribute__ ((__packed__));
227 #define BTRFS_SUPER_INFO_OFFSET SZ_64K
228 #define BTRFS_SUPER_INFO_SIZE 4096
231 * the super block basically lists the main trees of the FS
232 * it currently lacks any block count etc etc
234 struct btrfs_super_block {
235 /* the first 4 fields must match struct btrfs_header */
236 u8 csum[BTRFS_CSUM_SIZE];
237 /* FS specific UUID, visible to user */
238 u8 fsid[BTRFS_FSID_SIZE];
239 __le64 bytenr; /* this block number */
242 /* allowed to be different from the btrfs_header from here own down */
249 /* this will help find the new super based on the log root */
250 __le64 log_root_transid;
253 __le64 root_dir_objectid;
257 __le32 __unused_leafsize;
259 __le32 sys_chunk_array_size;
260 __le64 chunk_root_generation;
262 __le64 compat_ro_flags;
263 __le64 incompat_flags;
268 struct btrfs_dev_item dev_item;
270 char label[BTRFS_LABEL_SIZE];
272 __le64 cache_generation;
273 __le64 uuid_tree_generation;
275 /* the UUID written into btree blocks */
276 u8 metadata_uuid[BTRFS_FSID_SIZE];
279 __le64 block_group_root;
280 __le64 block_group_root_generation;
281 u8 block_group_root_level;
283 /* future expansion */
286 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
287 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
289 /* Padded to 4096 bytes */
291 } __attribute__ ((__packed__));
292 static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE);
295 * Compat flags that we support. If any incompat flags are set other than the
296 * ones specified below then we will fail to mount
298 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
299 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
300 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
302 #define BTRFS_FEATURE_COMPAT_RO_SUPP \
303 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
304 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
305 BTRFS_FEATURE_COMPAT_RO_VERITY)
307 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
308 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
310 #ifdef CONFIG_BTRFS_DEBUG
312 * Extent tree v2 supported only with CONFIG_BTRFS_DEBUG
314 #define BTRFS_FEATURE_INCOMPAT_SUPP \
315 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
316 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
317 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
318 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
319 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
320 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
321 BTRFS_FEATURE_INCOMPAT_RAID56 | \
322 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
323 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
324 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
325 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
326 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
327 BTRFS_FEATURE_INCOMPAT_ZONED | \
328 BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2)
330 #define BTRFS_FEATURE_INCOMPAT_SUPP \
331 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
332 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
333 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
334 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
335 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
336 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
337 BTRFS_FEATURE_INCOMPAT_RAID56 | \
338 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
339 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
340 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
341 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
342 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
343 BTRFS_FEATURE_INCOMPAT_ZONED)
346 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
347 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
348 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
351 * A leaf is full of items. offset and size tell us where to find
352 * the item in the leaf (relative to the start of the data area)
355 struct btrfs_disk_key key;
358 } __attribute__ ((__packed__));
361 * leaves have an item area and a data area:
362 * [item0, item1....itemN] [free space] [dataN...data1, data0]
364 * The data is separate from the items to get the keys closer together
368 struct btrfs_header header;
369 struct btrfs_item items[];
370 } __attribute__ ((__packed__));
373 * all non-leaf blocks are nodes, they hold only keys and pointers to
376 struct btrfs_key_ptr {
377 struct btrfs_disk_key key;
380 } __attribute__ ((__packed__));
383 struct btrfs_header header;
384 struct btrfs_key_ptr ptrs[];
385 } __attribute__ ((__packed__));
387 /* Read ahead values for struct btrfs_path.reada */
393 * Similar to READA_FORWARD but unlike it:
395 * 1) It will trigger readahead even for leaves that are not close to
396 * each other on disk;
397 * 2) It also triggers readahead for nodes;
398 * 3) During a search, even when a node or leaf is already in memory, it
399 * will still trigger readahead for other nodes and leaves that follow
402 * This is meant to be used only when we know we are iterating over the
403 * entire tree or a very large part of it.
405 READA_FORWARD_ALWAYS,
409 * btrfs_paths remember the path taken from the root down to the leaf.
410 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
411 * to any other levels that are present.
413 * The slots array records the index of the item or block pointer
414 * used while walking the tree.
417 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
418 int slots[BTRFS_MAX_LEVEL];
419 /* if there is real range locking, this locks field will change */
420 u8 locks[BTRFS_MAX_LEVEL];
422 /* keep some upper locks as we walk down */
426 * set by btrfs_split_item, tells search_slot to keep all locks
427 * and to force calls to keep space in the nodes
429 unsigned int search_for_split:1;
430 unsigned int keep_locks:1;
431 unsigned int skip_locking:1;
432 unsigned int search_commit_root:1;
433 unsigned int need_commit_sem:1;
434 unsigned int skip_release_on_error:1;
436 * Indicate that new item (btrfs_search_slot) is extending already
437 * existing item and ins_len contains only the data size and not item
438 * header (ie. sizeof(struct btrfs_item) is not included).
440 unsigned int search_for_extension:1;
442 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
443 sizeof(struct btrfs_item))
444 struct btrfs_dev_replace {
445 u64 replace_state; /* see #define above */
446 time64_t time_started; /* seconds since 1-Jan-1970 */
447 time64_t time_stopped; /* seconds since 1-Jan-1970 */
448 atomic64_t num_write_errors;
449 atomic64_t num_uncorrectable_read_errors;
452 u64 committed_cursor_left;
453 u64 cursor_left_last_write_of_item;
456 u64 cont_reading_from_srcdev_mode; /* see #define above */
459 int item_needs_writeback;
460 struct btrfs_device *srcdev;
461 struct btrfs_device *tgtdev;
463 struct mutex lock_finishing_cancel_unmount;
464 struct rw_semaphore rwsem;
466 struct btrfs_scrub_progress scrub_progress;
468 struct percpu_counter bio_counter;
469 wait_queue_head_t replace_wait;
473 * free clusters are used to claim free space in relatively large chunks,
474 * allowing us to do less seeky writes. They are used for all metadata
475 * allocations. In ssd_spread mode they are also used for data allocations.
477 struct btrfs_free_cluster {
479 spinlock_t refill_lock;
482 /* largest extent in this cluster */
485 /* first extent starting offset */
488 /* We did a full search and couldn't create a cluster */
491 struct btrfs_block_group *block_group;
493 * when a cluster is allocated from a block group, we put the
494 * cluster onto a list in the block group so that it can
495 * be freed before the block group is freed.
497 struct list_head block_group_list;
500 enum btrfs_caching_type {
504 BTRFS_CACHE_FINISHED,
509 * Tree to record all locked full stripes of a RAID5/6 block group
511 struct btrfs_full_stripe_locks_tree {
516 /* Discard control. */
518 * Async discard uses multiple lists to differentiate the discard filter
519 * parameters. Index 0 is for completely free block groups where we need to
520 * ensure the entire block group is trimmed without being lossy. Indices
521 * afterwards represent monotonically decreasing discard filter sizes to
522 * prioritize what should be discarded next.
524 #define BTRFS_NR_DISCARD_LISTS 3
525 #define BTRFS_DISCARD_INDEX_UNUSED 0
526 #define BTRFS_DISCARD_INDEX_START 1
528 struct btrfs_discard_ctl {
529 struct workqueue_struct *discard_workers;
530 struct delayed_work work;
532 struct btrfs_block_group *block_group;
533 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
535 u64 prev_discard_time;
536 atomic_t discardable_extents;
537 atomic64_t discardable_bytes;
538 u64 max_discard_size;
542 u64 discard_extent_bytes;
543 u64 discard_bitmap_bytes;
544 atomic64_t discard_bytes_saved;
547 void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
550 struct reloc_control;
552 struct btrfs_fs_devices;
553 struct btrfs_balance_control;
554 struct btrfs_delayed_root;
557 * Block group or device which contains an active swapfile. Used for preventing
558 * unsafe operations while a swapfile is active.
560 * These are sorted on (ptr, inode) (note that a block group or device can
561 * contain more than one swapfile). We compare the pointer values because we
562 * don't actually care what the object is, we just need a quick check whether
563 * the object exists in the rbtree.
565 struct btrfs_swapfile_pin {
570 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
571 * points to a struct btrfs_device.
575 * Only used when 'is_block_group' is true and it is the number of
576 * extents used by a swapfile for this block group ('ptr' field).
581 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
584 BTRFS_FS_CLOSING_START,
585 BTRFS_FS_CLOSING_DONE,
586 BTRFS_FS_LOG_RECOVERING,
588 BTRFS_FS_QUOTA_ENABLED,
589 BTRFS_FS_UPDATE_UUID_TREE_GEN,
590 BTRFS_FS_CREATING_FREE_SPACE_TREE,
594 BTRFS_FS_QUOTA_OVERRIDE,
595 /* Used to record internally whether fs has been frozen */
598 * Indicate that balance has been set up from the ioctl and is in the
599 * main phase. The fs_info::balance_ctl is initialized.
601 BTRFS_FS_BALANCE_RUNNING,
604 * Indicate that relocation of a chunk has started, it's set per chunk
605 * and is toggled between chunks.
607 BTRFS_FS_RELOC_RUNNING,
609 /* Indicate that the cleaner thread is awake and doing something. */
610 BTRFS_FS_CLEANER_RUNNING,
613 * The checksumming has an optimized version and is considered fast,
614 * so we don't need to offload checksums to workqueues.
616 BTRFS_FS_CSUM_IMPL_FAST,
618 /* Indicate that the discard workqueue can service discards. */
619 BTRFS_FS_DISCARD_RUNNING,
621 /* Indicate that we need to cleanup space cache v1 */
622 BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
624 /* Indicate that we can't trust the free space tree for caching yet */
625 BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
627 /* Indicate whether there are any tree modification log users */
628 BTRFS_FS_TREE_MOD_LOG_USERS,
630 /* Indicate that we want the transaction kthread to commit right now. */
631 BTRFS_FS_COMMIT_TRANS,
633 /* Indicate we have half completed snapshot deletions pending. */
634 BTRFS_FS_UNFINISHED_DROPS,
636 #if BITS_PER_LONG == 32
637 /* Indicate if we have error/warn message printed on 32bit systems */
638 BTRFS_FS_32BIT_ERROR,
644 * Exclusive operations (device replace, resize, device add/remove, balance)
646 enum btrfs_exclusive_operation {
648 BTRFS_EXCLOP_BALANCE_PAUSED,
649 BTRFS_EXCLOP_BALANCE,
650 BTRFS_EXCLOP_DEV_ADD,
651 BTRFS_EXCLOP_DEV_REMOVE,
652 BTRFS_EXCLOP_DEV_REPLACE,
654 BTRFS_EXCLOP_SWAP_ACTIVATE,
657 struct btrfs_fs_info {
658 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
660 struct btrfs_root *tree_root;
661 struct btrfs_root *chunk_root;
662 struct btrfs_root *dev_root;
663 struct btrfs_root *fs_root;
664 struct btrfs_root *quota_root;
665 struct btrfs_root *uuid_root;
666 struct btrfs_root *data_reloc_root;
667 struct btrfs_root *block_group_root;
669 /* the log root tree is a directory of all the other log roots */
670 struct btrfs_root *log_root_tree;
672 /* The tree that holds the global roots (csum, extent, etc) */
673 rwlock_t global_root_lock;
674 struct rb_root global_root_tree;
676 spinlock_t fs_roots_radix_lock;
677 struct radix_tree_root fs_roots_radix;
679 /* block group cache stuff */
680 spinlock_t block_group_cache_lock;
681 u64 first_logical_byte;
682 struct rb_root block_group_cache_tree;
684 /* keep track of unallocated space */
685 atomic64_t free_chunk_space;
687 /* Track ranges which are used by log trees blocks/logged data extents */
688 struct extent_io_tree excluded_extents;
690 /* logical->physical extent mapping */
691 struct extent_map_tree mapping_tree;
694 * block reservation for extent, checksum, root tree and
695 * delayed dir index item
697 struct btrfs_block_rsv global_block_rsv;
698 /* block reservation for metadata operations */
699 struct btrfs_block_rsv trans_block_rsv;
700 /* block reservation for chunk tree */
701 struct btrfs_block_rsv chunk_block_rsv;
702 /* block reservation for delayed operations */
703 struct btrfs_block_rsv delayed_block_rsv;
704 /* block reservation for delayed refs */
705 struct btrfs_block_rsv delayed_refs_rsv;
707 struct btrfs_block_rsv empty_block_rsv;
710 u64 last_trans_committed;
712 * Generation of the last transaction used for block group relocation
713 * since the filesystem was last mounted (or 0 if none happened yet).
714 * Must be written and read while holding btrfs_fs_info::commit_root_sem.
716 u64 last_reloc_trans;
717 u64 avg_delayed_ref_runtime;
720 * this is updated to the current trans every time a full commit
721 * is required instead of the faster short fsync log commits
723 u64 last_trans_log_full_commit;
724 unsigned long mount_opt;
726 * Track requests for actions that need to be done during transaction
727 * commit (like for some mount options).
729 unsigned long pending_changes;
730 unsigned long compress_type:4;
731 unsigned int compress_level;
734 * It is a suggestive number, the read side is safe even it gets a
735 * wrong number because we will write out the data into a regular
736 * extent. The write side(mount/remount) is under ->s_umount lock,
737 * so it is also safe.
741 struct btrfs_transaction *running_transaction;
742 wait_queue_head_t transaction_throttle;
743 wait_queue_head_t transaction_wait;
744 wait_queue_head_t transaction_blocked_wait;
745 wait_queue_head_t async_submit_wait;
748 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
749 * when they are updated.
751 * Because we do not clear the flags for ever, so we needn't use
752 * the lock on the read side.
754 * We also needn't use the lock when we mount the fs, because
755 * there is no other task which will update the flag.
757 spinlock_t super_lock;
758 struct btrfs_super_block *super_copy;
759 struct btrfs_super_block *super_for_commit;
760 struct super_block *sb;
761 struct inode *btree_inode;
762 struct mutex tree_log_mutex;
763 struct mutex transaction_kthread_mutex;
764 struct mutex cleaner_mutex;
765 struct mutex chunk_mutex;
768 * this is taken to make sure we don't set block groups ro after
769 * the free space cache has been allocated on them
771 struct mutex ro_block_group_mutex;
773 /* this is used during read/modify/write to make sure
774 * no two ios are trying to mod the same stripe at the same
777 struct btrfs_stripe_hash_table *stripe_hash_table;
780 * this protects the ordered operations list only while we are
781 * processing all of the entries on it. This way we make
782 * sure the commit code doesn't find the list temporarily empty
783 * because another function happens to be doing non-waiting preflush
784 * before jumping into the main commit.
786 struct mutex ordered_operations_mutex;
788 struct rw_semaphore commit_root_sem;
790 struct rw_semaphore cleanup_work_sem;
792 struct rw_semaphore subvol_sem;
794 spinlock_t trans_lock;
796 * the reloc mutex goes with the trans lock, it is taken
797 * during commit to protect us from the relocation code
799 struct mutex reloc_mutex;
801 struct list_head trans_list;
802 struct list_head dead_roots;
803 struct list_head caching_block_groups;
805 spinlock_t delayed_iput_lock;
806 struct list_head delayed_iputs;
807 atomic_t nr_delayed_iputs;
808 wait_queue_head_t delayed_iputs_wait;
810 atomic64_t tree_mod_seq;
812 /* this protects tree_mod_log and tree_mod_seq_list */
813 rwlock_t tree_mod_log_lock;
814 struct rb_root tree_mod_log;
815 struct list_head tree_mod_seq_list;
817 atomic_t async_delalloc_pages;
820 * this is used to protect the following list -- ordered_roots.
822 spinlock_t ordered_root_lock;
825 * all fs/file tree roots in which there are data=ordered extents
826 * pending writeback are added into this list.
828 * these can span multiple transactions and basically include
829 * every dirty data page that isn't from nodatacow
831 struct list_head ordered_roots;
833 struct mutex delalloc_root_mutex;
834 spinlock_t delalloc_root_lock;
835 /* all fs/file tree roots that have delalloc inodes. */
836 struct list_head delalloc_roots;
839 * there is a pool of worker threads for checksumming during writes
840 * and a pool for checksumming after reads. This is because readers
841 * can run with FS locks held, and the writers may be waiting for
842 * those locks. We don't want ordering in the pending list to cause
843 * deadlocks, and so the two are serviced separately.
845 * A third pool does submit_bio to avoid deadlocking with the other
848 struct btrfs_workqueue *workers;
849 struct btrfs_workqueue *delalloc_workers;
850 struct btrfs_workqueue *flush_workers;
851 struct btrfs_workqueue *endio_workers;
852 struct btrfs_workqueue *endio_meta_workers;
853 struct btrfs_workqueue *endio_raid56_workers;
854 struct btrfs_workqueue *rmw_workers;
855 struct btrfs_workqueue *endio_meta_write_workers;
856 struct btrfs_workqueue *endio_write_workers;
857 struct btrfs_workqueue *endio_freespace_worker;
858 struct btrfs_workqueue *caching_workers;
861 * fixup workers take dirty pages that didn't properly go through
862 * the cow mechanism and make them safe to write. It happens
863 * for the sys_munmap function call path
865 struct btrfs_workqueue *fixup_workers;
866 struct btrfs_workqueue *delayed_workers;
868 struct task_struct *transaction_kthread;
869 struct task_struct *cleaner_kthread;
870 u32 thread_pool_size;
872 struct kobject *space_info_kobj;
873 struct kobject *qgroups_kobj;
875 /* used to keep from writing metadata until there is a nice batch */
876 struct percpu_counter dirty_metadata_bytes;
877 struct percpu_counter delalloc_bytes;
878 struct percpu_counter ordered_bytes;
879 s32 dirty_metadata_batch;
882 struct list_head dirty_cowonly_roots;
884 struct btrfs_fs_devices *fs_devices;
887 * The space_info list is effectively read only after initial
888 * setup. It is populated at mount time and cleaned up after
889 * all block groups are removed. RCU is used to protect it.
891 struct list_head space_info;
893 struct btrfs_space_info *data_sinfo;
895 struct reloc_control *reloc_ctl;
897 /* data_alloc_cluster is only used in ssd_spread mode */
898 struct btrfs_free_cluster data_alloc_cluster;
900 /* all metadata allocations go through this cluster */
901 struct btrfs_free_cluster meta_alloc_cluster;
903 /* auto defrag inodes go here */
904 spinlock_t defrag_inodes_lock;
905 struct rb_root defrag_inodes;
906 atomic_t defrag_running;
908 /* Used to protect avail_{data, metadata, system}_alloc_bits */
909 seqlock_t profiles_lock;
911 * these three are in extended format (availability of single
912 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
913 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
915 u64 avail_data_alloc_bits;
916 u64 avail_metadata_alloc_bits;
917 u64 avail_system_alloc_bits;
919 /* restriper state */
920 spinlock_t balance_lock;
921 struct mutex balance_mutex;
922 atomic_t balance_pause_req;
923 atomic_t balance_cancel_req;
924 struct btrfs_balance_control *balance_ctl;
925 wait_queue_head_t balance_wait_q;
927 /* Cancellation requests for chunk relocation */
928 atomic_t reloc_cancel_req;
930 u32 data_chunk_allocations;
935 /* private scrub information */
936 struct mutex scrub_lock;
937 atomic_t scrubs_running;
938 atomic_t scrub_pause_req;
939 atomic_t scrubs_paused;
940 atomic_t scrub_cancel_req;
941 wait_queue_head_t scrub_pause_wait;
943 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
946 refcount_t scrub_workers_refcnt;
947 struct btrfs_workqueue *scrub_workers;
948 struct btrfs_workqueue *scrub_wr_completion_workers;
949 struct btrfs_workqueue *scrub_parity_workers;
950 struct btrfs_subpage_info *subpage_info;
952 struct btrfs_discard_ctl discard_ctl;
954 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
955 u32 check_integrity_print_mask;
957 /* is qgroup tracking in a consistent state? */
960 /* holds configuration and tracking. Protected by qgroup_lock */
961 struct rb_root qgroup_tree;
962 spinlock_t qgroup_lock;
965 * used to avoid frequently calling ulist_alloc()/ulist_free()
966 * when doing qgroup accounting, it must be protected by qgroup_lock.
968 struct ulist *qgroup_ulist;
971 * Protect user change for quota operations. If a transaction is needed,
972 * it must be started before locking this lock.
974 struct mutex qgroup_ioctl_lock;
976 /* list of dirty qgroups to be written at next commit */
977 struct list_head dirty_qgroups;
979 /* used by qgroup for an efficient tree traversal */
982 /* qgroup rescan items */
983 struct mutex qgroup_rescan_lock; /* protects the progress item */
984 struct btrfs_key qgroup_rescan_progress;
985 struct btrfs_workqueue *qgroup_rescan_workers;
986 struct completion qgroup_rescan_completion;
987 struct btrfs_work qgroup_rescan_work;
988 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */
990 /* filesystem state */
991 unsigned long fs_state;
993 struct btrfs_delayed_root *delayed_root;
995 /* Extent buffer radix tree */
996 spinlock_t buffer_lock;
997 /* Entries are eb->start / sectorsize */
998 struct radix_tree_root buffer_radix;
1000 /* next backup root to be overwritten */
1001 int backup_root_index;
1003 /* device replace state */
1004 struct btrfs_dev_replace dev_replace;
1006 struct semaphore uuid_tree_rescan_sem;
1008 /* Used to reclaim the metadata space in the background. */
1009 struct work_struct async_reclaim_work;
1010 struct work_struct async_data_reclaim_work;
1011 struct work_struct preempt_reclaim_work;
1013 /* Reclaim partially filled block groups in the background */
1014 struct work_struct reclaim_bgs_work;
1015 struct list_head reclaim_bgs;
1016 int bg_reclaim_threshold;
1018 spinlock_t unused_bgs_lock;
1019 struct list_head unused_bgs;
1020 struct mutex unused_bg_unpin_mutex;
1021 /* Protect block groups that are going to be deleted */
1022 struct mutex reclaim_bgs_lock;
1024 /* Cached block sizes */
1027 /* ilog2 of sectorsize, use to avoid 64bit division */
1028 u32 sectorsize_bits;
1033 /* Block groups and devices containing active swapfiles. */
1034 spinlock_t swapfile_pins_lock;
1035 struct rb_root swapfile_pins;
1037 struct crypto_shash *csum_shash;
1039 /* Type of exclusive operation running, protected by super_lock */
1040 enum btrfs_exclusive_operation exclusive_operation;
1043 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1044 * if the mode is enabled
1051 struct mutex zoned_meta_io_lock;
1052 spinlock_t treelog_bg_lock;
1056 * Start of the dedicated data relocation block group, protected by
1057 * relocation_bg_lock.
1059 spinlock_t relocation_bg_lock;
1062 u64 nr_global_roots;
1064 spinlock_t zone_active_bgs_lock;
1065 struct list_head zone_active_bgs;
1067 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1068 spinlock_t ref_verify_lock;
1069 struct rb_root block_tree;
1072 #ifdef CONFIG_BTRFS_DEBUG
1073 struct kobject *debug_kobj;
1074 struct kobject *discard_debug_kobj;
1075 struct list_head allocated_roots;
1077 spinlock_t eb_leak_lock;
1078 struct list_head allocated_ebs;
1082 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1084 return sb->s_fs_info;
1088 * The state of btrfs root
1092 * btrfs_record_root_in_trans is a multi-step process, and it can race
1093 * with the balancing code. But the race is very small, and only the
1094 * first time the root is added to each transaction. So IN_TRANS_SETUP
1095 * is used to tell us when more checks are required
1097 BTRFS_ROOT_IN_TRANS_SETUP,
1100 * Set if tree blocks of this root can be shared by other roots.
1101 * Only subvolume trees and their reloc trees have this bit set.
1102 * Conflicts with TRACK_DIRTY bit.
1104 * This affects two things:
1106 * - How balance works
1107 * For shareable roots, we need to use reloc tree and do path
1108 * replacement for balance, and need various pre/post hooks for
1109 * snapshot creation to handle them.
1111 * While for non-shareable trees, we just simply do a tree search
1114 * - How dirty roots are tracked
1115 * For shareable roots, btrfs_record_root_in_trans() is needed to
1116 * track them, while non-subvolume roots have TRACK_DIRTY bit, they
1117 * don't need to set this manually.
1119 BTRFS_ROOT_SHAREABLE,
1120 BTRFS_ROOT_TRACK_DIRTY,
1121 BTRFS_ROOT_IN_RADIX,
1122 BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1123 BTRFS_ROOT_DEFRAG_RUNNING,
1124 BTRFS_ROOT_FORCE_COW,
1125 BTRFS_ROOT_MULTI_LOG_TASKS,
1127 BTRFS_ROOT_DELETING,
1130 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1132 * Set for the subvolume tree owning the reloc tree.
1134 BTRFS_ROOT_DEAD_RELOC_TREE,
1135 /* Mark dead root stored on device whose cleanup needs to be resumed */
1136 BTRFS_ROOT_DEAD_TREE,
1137 /* The root has a log tree. Used for subvolume roots and the tree root. */
1138 BTRFS_ROOT_HAS_LOG_TREE,
1139 /* Qgroup flushing is in progress */
1140 BTRFS_ROOT_QGROUP_FLUSHING,
1141 /* We started the orphan cleanup for this root. */
1142 BTRFS_ROOT_ORPHAN_CLEANUP,
1143 /* This root has a drop operation that was started previously. */
1144 BTRFS_ROOT_UNFINISHED_DROP,
1147 static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
1149 clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags);
1153 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1154 * code. For detail check comment in fs/btrfs/qgroup.c.
1156 struct btrfs_qgroup_swapped_blocks {
1158 /* RM_EMPTY_ROOT() of above blocks[] */
1160 struct rb_root blocks[BTRFS_MAX_LEVEL];
1164 * in ram representation of the tree. extent_root is used for all allocations
1165 * and for the extent tree extent_root root.
1168 struct rb_node rb_node;
1170 struct extent_buffer *node;
1172 struct extent_buffer *commit_root;
1173 struct btrfs_root *log_root;
1174 struct btrfs_root *reloc_root;
1176 unsigned long state;
1177 struct btrfs_root_item root_item;
1178 struct btrfs_key root_key;
1179 struct btrfs_fs_info *fs_info;
1180 struct extent_io_tree dirty_log_pages;
1182 struct mutex objectid_mutex;
1184 spinlock_t accounting_lock;
1185 struct btrfs_block_rsv *block_rsv;
1187 struct mutex log_mutex;
1188 wait_queue_head_t log_writer_wait;
1189 wait_queue_head_t log_commit_wait[2];
1190 struct list_head log_ctxs[2];
1191 /* Used only for log trees of subvolumes, not for the log root tree */
1192 atomic_t log_writers;
1193 atomic_t log_commit[2];
1194 /* Used only for log trees of subvolumes, not for the log root tree */
1197 /* No matter the commit succeeds or not*/
1198 int log_transid_committed;
1199 /* Just be updated when the commit succeeds. */
1200 int last_log_commit;
1201 pid_t log_start_pid;
1209 struct btrfs_key defrag_progress;
1210 struct btrfs_key defrag_max;
1212 /* The dirty list is only used by non-shareable roots */
1213 struct list_head dirty_list;
1215 struct list_head root_list;
1217 spinlock_t log_extents_lock[2];
1218 struct list_head logged_list[2];
1220 spinlock_t inode_lock;
1221 /* red-black tree that keeps track of in-memory inodes */
1222 struct rb_root inode_tree;
1225 * radix tree that keeps track of delayed nodes of every inode,
1226 * protected by inode_lock
1228 struct radix_tree_root delayed_nodes_tree;
1230 * right now this just gets used so that a root has its own devid
1231 * for stat. It may be used for more later
1235 spinlock_t root_item_lock;
1238 struct mutex delalloc_mutex;
1239 spinlock_t delalloc_lock;
1241 * all of the inodes that have delalloc bytes. It is possible for
1242 * this list to be empty even when there is still dirty data=ordered
1243 * extents waiting to finish IO.
1245 struct list_head delalloc_inodes;
1246 struct list_head delalloc_root;
1247 u64 nr_delalloc_inodes;
1249 struct mutex ordered_extent_mutex;
1251 * this is used by the balancing code to wait for all the pending
1254 spinlock_t ordered_extent_lock;
1257 * all of the data=ordered extents pending writeback
1258 * these can span multiple transactions and basically include
1259 * every dirty data page that isn't from nodatacow
1261 struct list_head ordered_extents;
1262 struct list_head ordered_root;
1263 u64 nr_ordered_extents;
1266 * Not empty if this subvolume root has gone through tree block swap
1269 * Will be used by reloc_control::dirty_subvol_roots.
1271 struct list_head reloc_dirty_list;
1274 * Number of currently running SEND ioctls to prevent
1275 * manipulation with the read-only status via SUBVOL_SETFLAGS
1277 int send_in_progress;
1279 * Number of currently running deduplication operations that have a
1280 * destination inode belonging to this root. Protected by the lock
1283 int dedupe_in_progress;
1284 /* For exclusion of snapshot creation and nocow writes */
1285 struct btrfs_drew_lock snapshot_lock;
1287 atomic_t snapshot_force_cow;
1289 /* For qgroup metadata reserved space */
1290 spinlock_t qgroup_meta_rsv_lock;
1291 u64 qgroup_meta_rsv_pertrans;
1292 u64 qgroup_meta_rsv_prealloc;
1293 wait_queue_head_t qgroup_flush_wait;
1295 /* Number of active swapfiles */
1296 atomic_t nr_swapfiles;
1298 /* Record pairs of swapped blocks for qgroup */
1299 struct btrfs_qgroup_swapped_blocks swapped_blocks;
1301 /* Used only by log trees, when logging csum items */
1302 struct extent_io_tree log_csum_range;
1304 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1308 #ifdef CONFIG_BTRFS_DEBUG
1309 struct list_head leak_list;
1314 * Structure that conveys information about an extent that is going to replace
1315 * all the extents in a file range.
1317 struct btrfs_replace_extent_info {
1323 /* Pointer to a file extent item of type regular or prealloc. */
1326 * Set to true when attempting to replace a file range with a new extent
1327 * described by this structure, set to false when attempting to clone an
1328 * existing extent into a file range.
1331 /* Meaningful only if is_new_extent is true. */
1332 int qgroup_reserved;
1334 * Meaningful only if is_new_extent is true.
1335 * Used to track how many extent items we have already inserted in a
1336 * subvolume tree that refer to the extent described by this structure,
1337 * so that we know when to create a new delayed ref or update an existing
1343 /* Arguments for btrfs_drop_extents() */
1344 struct btrfs_drop_extents_args {
1345 /* Input parameters */
1348 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1349 * If 'replace_extent' is true, this must not be NULL. Also the path
1350 * is always released except if 'replace_extent' is true and
1351 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1352 * the path is kept locked.
1354 struct btrfs_path *path;
1355 /* Start offset of the range to drop extents from */
1357 /* End (exclusive, last byte + 1) of the range to drop extents from */
1359 /* If true drop all the extent maps in the range */
1362 * If true it means we want to insert a new extent after dropping all
1363 * the extents in the range. If this is true, the 'extent_item_size'
1364 * parameter must be set as well and the 'extent_inserted' field will
1365 * be set to true by btrfs_drop_extents() if it could insert the new
1367 * Note: when this is set to true the path must not be NULL.
1369 bool replace_extent;
1371 * Used if 'replace_extent' is true. Size of the file extent item to
1372 * insert after dropping all existing extents in the range
1374 u32 extent_item_size;
1376 /* Output parameters */
1379 * Set to the minimum between the input parameter 'end' and the end
1380 * (exclusive, last byte + 1) of the last dropped extent. This is always
1381 * set even if btrfs_drop_extents() returns an error.
1385 * The number of allocated bytes found in the range. This can be smaller
1386 * than the range's length when there are holes in the range.
1390 * Only set if 'replace_extent' is true. Set to true if we were able
1391 * to insert a replacement extent after dropping all extents in the
1392 * range, otherwise set to false by btrfs_drop_extents().
1393 * Also, if btrfs_drop_extents() has set this to true it means it
1394 * returned with the path locked, otherwise if it has set this to
1395 * false it has returned with the path released.
1397 bool extent_inserted;
1400 struct btrfs_file_private {
1405 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1408 return info->nodesize - sizeof(struct btrfs_header);
1411 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items)
1413 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1415 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1418 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1420 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1423 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1424 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1425 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1427 return BTRFS_MAX_ITEM_SIZE(info) -
1428 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1431 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1433 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1437 * Flags for mount options.
1439 * Note: don't forget to add new options to btrfs_show_options()
1442 BTRFS_MOUNT_NODATASUM = (1UL << 0),
1443 BTRFS_MOUNT_NODATACOW = (1UL << 1),
1444 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
1445 BTRFS_MOUNT_SSD = (1UL << 3),
1446 BTRFS_MOUNT_DEGRADED = (1UL << 4),
1447 BTRFS_MOUNT_COMPRESS = (1UL << 5),
1448 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
1449 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
1450 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
1451 BTRFS_MOUNT_NOSSD = (1UL << 9),
1452 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
1453 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
1454 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
1455 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
1456 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
1457 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
1458 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
1459 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
1460 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
1461 BTRFS_MOUNT_CHECK_INTEGRITY = (1UL << 19),
1462 BTRFS_MOUNT_CHECK_INTEGRITY_DATA = (1UL << 20),
1463 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 21),
1464 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 22),
1465 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 23),
1466 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 24),
1467 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 25),
1468 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 26),
1469 BTRFS_MOUNT_REF_VERIFY = (1UL << 27),
1470 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 28),
1471 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 29),
1472 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 30),
1475 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1476 #define BTRFS_DEFAULT_MAX_INLINE (2048)
1478 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1479 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1480 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1481 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1484 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1486 if (!btrfs_test_opt(fs_info, opt)) \
1487 btrfs_info(fs_info, fmt, ##args); \
1488 btrfs_set_opt(fs_info->mount_opt, opt); \
1491 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1493 if (btrfs_test_opt(fs_info, opt)) \
1494 btrfs_info(fs_info, fmt, ##args); \
1495 btrfs_clear_opt(fs_info->mount_opt, opt); \
1499 * Requests for changes that need to be done during transaction commit.
1501 * Internal mount options that are used for special handling of the real
1502 * mount options (eg. cannot be set during remount and have to be set during
1503 * transaction commit)
1506 #define BTRFS_PENDING_COMMIT (0)
1508 #define btrfs_test_pending(info, opt) \
1509 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1510 #define btrfs_set_pending(info, opt) \
1511 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1512 #define btrfs_clear_pending(info, opt) \
1513 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1516 * Helpers for setting pending mount option changes.
1518 * Expects corresponding macros
1519 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1521 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1523 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1524 btrfs_info((info), fmt, ##args); \
1525 btrfs_set_pending((info), SET_##opt); \
1526 btrfs_clear_pending((info), CLEAR_##opt); \
1530 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1532 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1533 btrfs_info((info), fmt, ##args); \
1534 btrfs_set_pending((info), CLEAR_##opt); \
1535 btrfs_clear_pending((info), SET_##opt); \
1542 #define BTRFS_INODE_NODATASUM (1U << 0)
1543 #define BTRFS_INODE_NODATACOW (1U << 1)
1544 #define BTRFS_INODE_READONLY (1U << 2)
1545 #define BTRFS_INODE_NOCOMPRESS (1U << 3)
1546 #define BTRFS_INODE_PREALLOC (1U << 4)
1547 #define BTRFS_INODE_SYNC (1U << 5)
1548 #define BTRFS_INODE_IMMUTABLE (1U << 6)
1549 #define BTRFS_INODE_APPEND (1U << 7)
1550 #define BTRFS_INODE_NODUMP (1U << 8)
1551 #define BTRFS_INODE_NOATIME (1U << 9)
1552 #define BTRFS_INODE_DIRSYNC (1U << 10)
1553 #define BTRFS_INODE_COMPRESS (1U << 11)
1555 #define BTRFS_INODE_ROOT_ITEM_INIT (1U << 31)
1557 #define BTRFS_INODE_FLAG_MASK \
1558 (BTRFS_INODE_NODATASUM | \
1559 BTRFS_INODE_NODATACOW | \
1560 BTRFS_INODE_READONLY | \
1561 BTRFS_INODE_NOCOMPRESS | \
1562 BTRFS_INODE_PREALLOC | \
1563 BTRFS_INODE_SYNC | \
1564 BTRFS_INODE_IMMUTABLE | \
1565 BTRFS_INODE_APPEND | \
1566 BTRFS_INODE_NODUMP | \
1567 BTRFS_INODE_NOATIME | \
1568 BTRFS_INODE_DIRSYNC | \
1569 BTRFS_INODE_COMPRESS | \
1570 BTRFS_INODE_ROOT_ITEM_INIT)
1572 #define BTRFS_INODE_RO_VERITY (1U << 0)
1574 #define BTRFS_INODE_RO_FLAG_MASK (BTRFS_INODE_RO_VERITY)
1576 struct btrfs_map_token {
1577 struct extent_buffer *eb;
1579 unsigned long offset;
1582 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1583 ((bytes) >> (fs_info)->sectorsize_bits)
1585 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1586 struct extent_buffer *eb)
1589 token->kaddr = page_address(eb->pages[0]);
1593 /* some macros to generate set/get functions for the struct fields. This
1594 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1597 #define le8_to_cpu(v) (v)
1598 #define cpu_to_le8(v) (v)
1601 static inline u8 get_unaligned_le8(const void *p)
1606 static inline void put_unaligned_le8(u8 val, void *p)
1611 #define read_eb_member(eb, ptr, type, member, result) (\
1612 read_extent_buffer(eb, (char *)(result), \
1613 ((unsigned long)(ptr)) + \
1614 offsetof(type, member), \
1615 sizeof(((type *)0)->member)))
1617 #define write_eb_member(eb, ptr, type, member, result) (\
1618 write_extent_buffer(eb, (char *)(result), \
1619 ((unsigned long)(ptr)) + \
1620 offsetof(type, member), \
1621 sizeof(((type *)0)->member)))
1623 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1624 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
1625 const void *ptr, unsigned long off); \
1626 void btrfs_set_token_##bits(struct btrfs_map_token *token, \
1627 const void *ptr, unsigned long off, \
1629 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
1630 const void *ptr, unsigned long off); \
1631 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
1632 unsigned long off, u##bits val);
1634 DECLARE_BTRFS_SETGET_BITS(8)
1635 DECLARE_BTRFS_SETGET_BITS(16)
1636 DECLARE_BTRFS_SETGET_BITS(32)
1637 DECLARE_BTRFS_SETGET_BITS(64)
1639 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1640 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1643 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1644 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1646 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1649 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1650 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1652 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
1655 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1656 return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1658 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1659 type *s, u##bits val) \
1661 static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
1662 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
1665 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1666 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1668 const type *p = page_address(eb->pages[0]) + \
1669 offset_in_page(eb->start); \
1670 return get_unaligned_le##bits(&p->member); \
1672 static inline void btrfs_set_##name(const struct extent_buffer *eb, \
1675 type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1676 put_unaligned_le##bits(val, &p->member); \
1679 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1680 static inline u##bits btrfs_##name(const type *s) \
1682 return get_unaligned_le##bits(&s->member); \
1684 static inline void btrfs_set_##name(type *s, u##bits val) \
1686 put_unaligned_le##bits(val, &s->member); \
1689 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1690 struct btrfs_dev_item *s)
1692 static_assert(sizeof(u64) ==
1693 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1694 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1697 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1698 struct btrfs_dev_item *s,
1701 static_assert(sizeof(u64) ==
1702 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1703 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1704 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1708 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1709 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1710 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1711 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1712 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1714 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1715 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1716 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1717 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1718 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1719 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1721 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1722 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1724 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1726 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1728 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1730 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1732 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1733 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1735 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1737 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1739 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1742 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1744 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1747 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1749 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1752 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1753 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1754 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1755 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1756 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1757 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1758 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1759 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1760 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1761 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1762 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1764 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1766 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1769 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1770 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1771 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1773 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1775 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1777 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1779 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1780 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1782 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1784 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1785 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1787 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1790 unsigned long offset = (unsigned long)c;
1791 offset += offsetof(struct btrfs_chunk, stripe);
1792 offset += nr * sizeof(struct btrfs_stripe);
1793 return (struct btrfs_stripe *)offset;
1796 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1798 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1801 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1802 struct btrfs_chunk *c, int nr)
1804 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1807 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1808 struct btrfs_chunk *c, int nr)
1810 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1813 /* struct btrfs_block_group_item */
1814 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1816 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1818 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1819 struct btrfs_block_group_item, chunk_objectid, 64);
1821 BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1822 struct btrfs_block_group_item, chunk_objectid, 64);
1823 BTRFS_SETGET_FUNCS(block_group_flags,
1824 struct btrfs_block_group_item, flags, 64);
1825 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1826 struct btrfs_block_group_item, flags, 64);
1828 /* struct btrfs_free_space_info */
1829 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1831 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1833 /* struct btrfs_inode_ref */
1834 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1835 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1837 /* struct btrfs_inode_extref */
1838 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1839 parent_objectid, 64);
1840 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1842 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1844 /* struct btrfs_inode_item */
1845 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1846 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1847 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1848 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1849 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1850 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1851 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1852 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1853 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1854 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1855 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1856 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1857 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1859 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1861 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1863 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1864 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1866 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1868 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1869 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1870 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1871 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1872 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1873 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1874 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1875 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1876 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1877 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1879 /* struct btrfs_dev_extent */
1880 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1882 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1883 chunk_objectid, 64);
1884 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1886 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1887 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1888 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1890 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1892 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1894 static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1895 struct btrfs_tree_block_info *item,
1896 struct btrfs_disk_key *key)
1898 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1901 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1902 struct btrfs_tree_block_info *item,
1903 struct btrfs_disk_key *key)
1905 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1908 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1910 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1912 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1914 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1917 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1920 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1922 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1925 static inline u32 btrfs_extent_inline_ref_size(int type)
1927 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1928 type == BTRFS_SHARED_BLOCK_REF_KEY)
1929 return sizeof(struct btrfs_extent_inline_ref);
1930 if (type == BTRFS_SHARED_DATA_REF_KEY)
1931 return sizeof(struct btrfs_shared_data_ref) +
1932 sizeof(struct btrfs_extent_inline_ref);
1933 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1934 return sizeof(struct btrfs_extent_data_ref) +
1935 offsetof(struct btrfs_extent_inline_ref, offset);
1939 /* struct btrfs_node */
1940 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1941 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1942 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1944 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1947 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1950 ptr = offsetof(struct btrfs_node, ptrs) +
1951 sizeof(struct btrfs_key_ptr) * nr;
1952 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1955 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1959 ptr = offsetof(struct btrfs_node, ptrs) +
1960 sizeof(struct btrfs_key_ptr) * nr;
1961 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1964 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1967 ptr = offsetof(struct btrfs_node, ptrs) +
1968 sizeof(struct btrfs_key_ptr) * nr;
1969 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1972 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1976 ptr = offsetof(struct btrfs_node, ptrs) +
1977 sizeof(struct btrfs_key_ptr) * nr;
1978 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1981 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1983 return offsetof(struct btrfs_node, ptrs) +
1984 sizeof(struct btrfs_key_ptr) * nr;
1987 void btrfs_node_key(const struct extent_buffer *eb,
1988 struct btrfs_disk_key *disk_key, int nr);
1990 static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1991 struct btrfs_disk_key *disk_key, int nr)
1994 ptr = btrfs_node_key_ptr_offset(nr);
1995 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1996 struct btrfs_key_ptr, key, disk_key);
1999 /* struct btrfs_item */
2000 BTRFS_SETGET_FUNCS(raw_item_offset, struct btrfs_item, offset, 32);
2001 BTRFS_SETGET_FUNCS(raw_item_size, struct btrfs_item, size, 32);
2002 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
2003 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
2005 static inline unsigned long btrfs_item_nr_offset(int nr)
2007 return offsetof(struct btrfs_leaf, items) +
2008 sizeof(struct btrfs_item) * nr;
2011 static inline struct btrfs_item *btrfs_item_nr(int nr)
2013 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2016 #define BTRFS_ITEM_SETGET_FUNCS(member) \
2017 static inline u32 btrfs_item_##member(const struct extent_buffer *eb, \
2020 return btrfs_raw_item_##member(eb, btrfs_item_nr(slot)); \
2022 static inline void btrfs_set_item_##member(const struct extent_buffer *eb, \
2023 int slot, u32 val) \
2025 btrfs_set_raw_item_##member(eb, btrfs_item_nr(slot), val); \
2027 static inline u32 btrfs_token_item_##member(struct btrfs_map_token *token, \
2030 struct btrfs_item *item = btrfs_item_nr(slot); \
2031 return btrfs_token_raw_item_##member(token, item); \
2033 static inline void btrfs_set_token_item_##member(struct btrfs_map_token *token, \
2034 int slot, u32 val) \
2036 struct btrfs_item *item = btrfs_item_nr(slot); \
2037 btrfs_set_token_raw_item_##member(token, item, val); \
2040 BTRFS_ITEM_SETGET_FUNCS(offset)
2041 BTRFS_ITEM_SETGET_FUNCS(size);
2043 static inline u32 btrfs_item_data_end(const struct extent_buffer *eb, int nr)
2045 return btrfs_item_offset(eb, nr) + btrfs_item_size(eb, nr);
2048 static inline void btrfs_item_key(const struct extent_buffer *eb,
2049 struct btrfs_disk_key *disk_key, int nr)
2051 struct btrfs_item *item = btrfs_item_nr(nr);
2052 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2055 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2056 struct btrfs_disk_key *disk_key, int nr)
2058 struct btrfs_item *item = btrfs_item_nr(nr);
2059 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2062 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2065 * struct btrfs_root_ref
2067 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2068 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2069 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2071 /* struct btrfs_dir_item */
2072 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2073 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2074 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2075 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2076 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2077 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2079 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2081 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2084 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2085 const struct btrfs_dir_item *item,
2086 struct btrfs_disk_key *key)
2088 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2091 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2092 struct btrfs_dir_item *item,
2093 const struct btrfs_disk_key *key)
2095 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2098 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2100 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2102 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2105 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2106 const struct btrfs_free_space_header *h,
2107 struct btrfs_disk_key *key)
2109 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2112 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2113 struct btrfs_free_space_header *h,
2114 const struct btrfs_disk_key *key)
2116 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2119 /* struct btrfs_disk_key */
2120 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2122 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2123 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2125 #ifdef __LITTLE_ENDIAN
2128 * Optimized helpers for little-endian architectures where CPU and on-disk
2129 * structures have the same endianness and we can skip conversions.
2132 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2133 const struct btrfs_disk_key *disk_key)
2135 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2138 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2139 const struct btrfs_key *cpu_key)
2141 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2144 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2145 struct btrfs_key *cpu_key, int nr)
2147 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2149 btrfs_node_key(eb, disk_key, nr);
2152 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2153 struct btrfs_key *cpu_key, int nr)
2155 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2157 btrfs_item_key(eb, disk_key, nr);
2160 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2161 const struct btrfs_dir_item *item,
2162 struct btrfs_key *cpu_key)
2164 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2166 btrfs_dir_item_key(eb, item, disk_key);
2171 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2172 const struct btrfs_disk_key *disk)
2174 cpu->offset = le64_to_cpu(disk->offset);
2175 cpu->type = disk->type;
2176 cpu->objectid = le64_to_cpu(disk->objectid);
2179 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2180 const struct btrfs_key *cpu)
2182 disk->offset = cpu_to_le64(cpu->offset);
2183 disk->type = cpu->type;
2184 disk->objectid = cpu_to_le64(cpu->objectid);
2187 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2188 struct btrfs_key *key, int nr)
2190 struct btrfs_disk_key disk_key;
2191 btrfs_node_key(eb, &disk_key, nr);
2192 btrfs_disk_key_to_cpu(key, &disk_key);
2195 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2196 struct btrfs_key *key, int nr)
2198 struct btrfs_disk_key disk_key;
2199 btrfs_item_key(eb, &disk_key, nr);
2200 btrfs_disk_key_to_cpu(key, &disk_key);
2203 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2204 const struct btrfs_dir_item *item,
2205 struct btrfs_key *key)
2207 struct btrfs_disk_key disk_key;
2208 btrfs_dir_item_key(eb, item, &disk_key);
2209 btrfs_disk_key_to_cpu(key, &disk_key);
2214 /* struct btrfs_header */
2215 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2216 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2218 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2219 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2220 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2221 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2222 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2224 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2225 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2227 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2229 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2231 return (btrfs_header_flags(eb) & flag) == flag;
2234 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2236 u64 flags = btrfs_header_flags(eb);
2237 btrfs_set_header_flags(eb, flags | flag);
2240 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2242 u64 flags = btrfs_header_flags(eb);
2243 btrfs_set_header_flags(eb, flags & ~flag);
2246 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2248 u64 flags = btrfs_header_flags(eb);
2249 return flags >> BTRFS_BACKREF_REV_SHIFT;
2252 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2255 u64 flags = btrfs_header_flags(eb);
2256 flags &= ~BTRFS_BACKREF_REV_MASK;
2257 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2258 btrfs_set_header_flags(eb, flags);
2261 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2263 return btrfs_header_level(eb) == 0;
2266 /* struct btrfs_root_item */
2267 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2269 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2270 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2271 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2273 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2275 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2276 BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2277 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2278 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2279 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2280 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2281 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2282 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2283 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2285 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2287 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2289 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2291 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2293 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2296 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2298 /* Byte-swap the constant at compile time, root_item::flags is LE */
2299 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2302 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2304 /* Byte-swap the constant at compile time, root_item::flags is LE */
2305 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2308 static inline u64 btrfs_root_id(const struct btrfs_root *root)
2310 return root->root_key.objectid;
2313 /* struct btrfs_root_backup */
2314 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2316 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2318 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2319 tree_root_level, 8);
2321 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2323 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2324 chunk_root_gen, 64);
2325 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2326 chunk_root_level, 8);
2328 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2330 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2331 extent_root_gen, 64);
2332 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2333 extent_root_level, 8);
2335 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2337 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2339 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2342 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2344 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2346 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2349 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2351 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2353 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2354 csum_root_level, 8);
2355 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2357 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2359 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2363 * For extent tree v2 we overload the extent root with the block group root, as
2364 * we will have multiple extent roots.
2366 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root, struct btrfs_root_backup,
2368 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_gen, struct btrfs_root_backup,
2369 extent_root_gen, 64);
2370 BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_level,
2371 struct btrfs_root_backup, extent_root_level, 8);
2373 /* struct btrfs_balance_item */
2374 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2376 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2377 const struct btrfs_balance_item *bi,
2378 struct btrfs_disk_balance_args *ba)
2380 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2383 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2384 struct btrfs_balance_item *bi,
2385 const struct btrfs_disk_balance_args *ba)
2387 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2390 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2391 const struct btrfs_balance_item *bi,
2392 struct btrfs_disk_balance_args *ba)
2394 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2397 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2398 struct btrfs_balance_item *bi,
2399 const struct btrfs_disk_balance_args *ba)
2401 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2404 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2405 const struct btrfs_balance_item *bi,
2406 struct btrfs_disk_balance_args *ba)
2408 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2411 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2412 struct btrfs_balance_item *bi,
2413 const struct btrfs_disk_balance_args *ba)
2415 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2419 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2420 const struct btrfs_disk_balance_args *disk)
2422 memset(cpu, 0, sizeof(*cpu));
2424 cpu->profiles = le64_to_cpu(disk->profiles);
2425 cpu->usage = le64_to_cpu(disk->usage);
2426 cpu->devid = le64_to_cpu(disk->devid);
2427 cpu->pstart = le64_to_cpu(disk->pstart);
2428 cpu->pend = le64_to_cpu(disk->pend);
2429 cpu->vstart = le64_to_cpu(disk->vstart);
2430 cpu->vend = le64_to_cpu(disk->vend);
2431 cpu->target = le64_to_cpu(disk->target);
2432 cpu->flags = le64_to_cpu(disk->flags);
2433 cpu->limit = le64_to_cpu(disk->limit);
2434 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2435 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2439 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2440 const struct btrfs_balance_args *cpu)
2442 memset(disk, 0, sizeof(*disk));
2444 disk->profiles = cpu_to_le64(cpu->profiles);
2445 disk->usage = cpu_to_le64(cpu->usage);
2446 disk->devid = cpu_to_le64(cpu->devid);
2447 disk->pstart = cpu_to_le64(cpu->pstart);
2448 disk->pend = cpu_to_le64(cpu->pend);
2449 disk->vstart = cpu_to_le64(cpu->vstart);
2450 disk->vend = cpu_to_le64(cpu->vend);
2451 disk->target = cpu_to_le64(cpu->target);
2452 disk->flags = cpu_to_le64(cpu->flags);
2453 disk->limit = cpu_to_le64(cpu->limit);
2454 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2455 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2458 /* struct btrfs_super_block */
2459 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2460 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2461 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2463 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2464 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2465 struct btrfs_super_block, sys_chunk_array_size, 32);
2466 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2467 struct btrfs_super_block, chunk_root_generation, 64);
2468 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2470 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2472 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2473 chunk_root_level, 8);
2474 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2476 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2477 log_root_transid, 64);
2478 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2480 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2482 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2484 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2486 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2488 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2490 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2491 root_dir_objectid, 64);
2492 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2494 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2496 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2497 compat_ro_flags, 64);
2498 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2499 incompat_flags, 64);
2500 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2502 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2503 cache_generation, 64);
2504 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2505 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2506 uuid_tree_generation, 64);
2507 BTRFS_SETGET_STACK_FUNCS(super_block_group_root, struct btrfs_super_block,
2508 block_group_root, 64);
2509 BTRFS_SETGET_STACK_FUNCS(super_block_group_root_generation,
2510 struct btrfs_super_block,
2511 block_group_root_generation, 64);
2512 BTRFS_SETGET_STACK_FUNCS(super_block_group_root_level, struct btrfs_super_block,
2513 block_group_root_level, 8);
2515 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2516 const char *btrfs_super_csum_name(u16 csum_type);
2517 const char *btrfs_super_csum_driver(u16 csum_type);
2518 size_t __attribute_const__ btrfs_get_num_csums(void);
2522 * The leaf data grows from end-to-front in the node.
2523 * this returns the address of the start of the last item,
2524 * which is the stop of the leaf data stack
2526 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2528 u32 nr = btrfs_header_nritems(leaf);
2531 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2532 return btrfs_item_offset(leaf, nr - 1);
2535 /* struct btrfs_file_extent_item */
2536 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2538 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2539 struct btrfs_file_extent_item, disk_bytenr, 64);
2540 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2541 struct btrfs_file_extent_item, offset, 64);
2542 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2543 struct btrfs_file_extent_item, generation, 64);
2544 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2545 struct btrfs_file_extent_item, num_bytes, 64);
2546 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2547 struct btrfs_file_extent_item, ram_bytes, 64);
2548 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2549 struct btrfs_file_extent_item, disk_num_bytes, 64);
2550 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2551 struct btrfs_file_extent_item, compression, 8);
2553 static inline unsigned long
2554 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2556 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2559 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2561 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2564 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2565 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2567 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2569 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2570 disk_num_bytes, 64);
2571 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2573 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2575 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2577 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2579 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2581 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2582 other_encoding, 16);
2585 * this returns the number of bytes used by the item on disk, minus the
2586 * size of any extent headers. If a file is compressed on disk, this is
2587 * the compressed size
2589 static inline u32 btrfs_file_extent_inline_item_len(
2590 const struct extent_buffer *eb,
2593 return btrfs_item_size(eb, nr) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2596 /* btrfs_qgroup_status_item */
2597 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2599 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2601 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2603 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2606 /* btrfs_qgroup_info_item */
2607 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2609 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2610 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2612 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2613 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2616 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2617 struct btrfs_qgroup_info_item, generation, 64);
2618 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2620 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2621 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2622 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2624 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2625 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2627 /* btrfs_qgroup_limit_item */
2628 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2630 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2632 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2634 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2636 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2639 /* btrfs_dev_replace_item */
2640 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2641 struct btrfs_dev_replace_item, src_devid, 64);
2642 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2643 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2645 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2647 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2649 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2651 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2652 num_write_errors, 64);
2653 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2654 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2656 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2658 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2661 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2662 struct btrfs_dev_replace_item, src_devid, 64);
2663 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2664 struct btrfs_dev_replace_item,
2665 cont_reading_from_srcdev_mode, 64);
2666 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2667 struct btrfs_dev_replace_item, replace_state, 64);
2668 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2669 struct btrfs_dev_replace_item, time_started, 64);
2670 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2671 struct btrfs_dev_replace_item, time_stopped, 64);
2672 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2673 struct btrfs_dev_replace_item, num_write_errors, 64);
2674 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2675 struct btrfs_dev_replace_item,
2676 num_uncorrectable_read_errors, 64);
2677 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2678 struct btrfs_dev_replace_item, cursor_left, 64);
2679 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2680 struct btrfs_dev_replace_item, cursor_right, 64);
2682 /* helper function to cast into the data area of the leaf. */
2683 #define btrfs_item_ptr(leaf, slot, type) \
2684 ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2685 btrfs_item_offset(leaf, slot)))
2687 #define btrfs_item_ptr_offset(leaf, slot) \
2688 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2689 btrfs_item_offset(leaf, slot)))
2691 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2693 return crc32c(crc, address, length);
2696 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2698 put_unaligned_le32(~crc, result);
2701 static inline u64 btrfs_name_hash(const char *name, int len)
2703 return crc32c((u32)~1, name, len);
2707 * Figure the key offset of an extended inode ref
2709 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2712 return (u64) crc32c(parent_objectid, name, len);
2715 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2717 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2722 enum btrfs_inline_ref_type {
2723 BTRFS_REF_TYPE_INVALID,
2724 BTRFS_REF_TYPE_BLOCK,
2725 BTRFS_REF_TYPE_DATA,
2729 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2730 struct btrfs_extent_inline_ref *iref,
2731 enum btrfs_inline_ref_type is_data);
2732 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2735 * Take the number of bytes to be checksummmed and figure out how many leaves
2736 * it would require to store the csums for that many bytes.
2738 static inline u64 btrfs_csum_bytes_to_leaves(
2739 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2741 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2743 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2747 * Use this if we would be adding new items, as we could split nodes as we cow
2750 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2753 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2757 * Doing a truncate or a modification won't result in new nodes or leaves, just
2758 * what we need for COW.
2760 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2763 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2766 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2767 u64 start, u64 num_bytes);
2768 void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2769 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2770 unsigned long count);
2771 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2772 struct btrfs_delayed_ref_root *delayed_refs,
2773 struct btrfs_delayed_ref_head *head);
2774 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2775 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2776 struct btrfs_fs_info *fs_info, u64 bytenr,
2777 u64 offset, int metadata, u64 *refs, u64 *flags);
2778 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2780 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2781 u64 bytenr, u64 num_bytes);
2782 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2783 int btrfs_cross_ref_exist(struct btrfs_root *root,
2784 u64 objectid, u64 offset, u64 bytenr, bool strict);
2785 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2786 struct btrfs_root *root,
2787 u64 parent, u64 root_objectid,
2788 const struct btrfs_disk_key *key,
2789 int level, u64 hint,
2791 enum btrfs_lock_nesting nest);
2792 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2794 struct extent_buffer *buf,
2795 u64 parent, int last_ref);
2796 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2797 struct btrfs_root *root, u64 owner,
2798 u64 offset, u64 ram_bytes,
2799 struct btrfs_key *ins);
2800 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2801 u64 root_objectid, u64 owner, u64 offset,
2802 struct btrfs_key *ins);
2803 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2804 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2805 struct btrfs_key *ins, int is_data, int delalloc);
2806 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2807 struct extent_buffer *buf, int full_backref);
2808 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2809 struct extent_buffer *buf, int full_backref);
2810 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2811 struct extent_buffer *eb, u64 flags,
2812 int level, int is_data);
2813 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2815 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2816 u64 start, u64 len, int delalloc);
2817 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2819 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2820 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2821 struct btrfs_ref *generic_ref);
2823 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2826 * Different levels for to flush space when doing space reservations.
2828 * The higher the level, the more methods we try to reclaim space.
2830 enum btrfs_reserve_flush_enum {
2831 /* If we are in the transaction, we can't flush anything.*/
2832 BTRFS_RESERVE_NO_FLUSH,
2836 * - Running delayed inode items
2837 * - Allocating a new chunk
2839 BTRFS_RESERVE_FLUSH_LIMIT,
2843 * - Running delayed inode items
2844 * - Running delayed refs
2845 * - Running delalloc and waiting for ordered extents
2846 * - Allocating a new chunk
2848 BTRFS_RESERVE_FLUSH_EVICT,
2851 * Flush space by above mentioned methods and by:
2852 * - Running delayed iputs
2853 * - Committing transaction
2855 * Can be interrupted by a fatal signal.
2857 BTRFS_RESERVE_FLUSH_DATA,
2858 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2859 BTRFS_RESERVE_FLUSH_ALL,
2862 * Pretty much the same as FLUSH_ALL, but can also steal space from
2865 * Can be interrupted by a fatal signal.
2867 BTRFS_RESERVE_FLUSH_ALL_STEAL,
2870 enum btrfs_flush_state {
2871 FLUSH_DELAYED_ITEMS_NR = 1,
2872 FLUSH_DELAYED_ITEMS = 2,
2873 FLUSH_DELAYED_REFS_NR = 3,
2874 FLUSH_DELAYED_REFS = 4,
2876 FLUSH_DELALLOC_WAIT = 6,
2877 FLUSH_DELALLOC_FULL = 7,
2879 ALLOC_CHUNK_FORCE = 9,
2880 RUN_DELAYED_IPUTS = 10,
2884 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2885 struct btrfs_block_rsv *rsv,
2886 int nitems, bool use_global_rsv);
2887 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2888 struct btrfs_block_rsv *rsv);
2889 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2891 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes,
2892 u64 disk_num_bytes);
2893 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2894 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2895 u64 start, u64 end);
2896 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2897 u64 num_bytes, u64 *actual_bytes);
2898 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2900 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2901 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2902 struct btrfs_fs_info *fs_info);
2903 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2904 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2905 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2908 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2910 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2911 int btrfs_previous_item(struct btrfs_root *root,
2912 struct btrfs_path *path, u64 min_objectid,
2914 int btrfs_previous_extent_item(struct btrfs_root *root,
2915 struct btrfs_path *path, u64 min_objectid);
2916 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2917 struct btrfs_path *path,
2918 const struct btrfs_key *new_key);
2919 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2920 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2921 struct btrfs_key *key, int lowest_level,
2923 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2924 struct btrfs_path *path,
2926 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2929 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2930 struct btrfs_root *root, struct extent_buffer *buf,
2931 struct extent_buffer *parent, int parent_slot,
2932 struct extent_buffer **cow_ret,
2933 enum btrfs_lock_nesting nest);
2934 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2935 struct btrfs_root *root,
2936 struct extent_buffer *buf,
2937 struct extent_buffer **cow_ret, u64 new_root_objectid);
2938 int btrfs_block_can_be_shared(struct btrfs_root *root,
2939 struct extent_buffer *buf);
2940 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2941 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2942 int btrfs_split_item(struct btrfs_trans_handle *trans,
2943 struct btrfs_root *root,
2944 struct btrfs_path *path,
2945 const struct btrfs_key *new_key,
2946 unsigned long split_offset);
2947 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2948 struct btrfs_root *root,
2949 struct btrfs_path *path,
2950 const struct btrfs_key *new_key);
2951 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2952 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2953 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2954 const struct btrfs_key *key, struct btrfs_path *p,
2955 int ins_len, int cow);
2956 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2957 struct btrfs_path *p, u64 time_seq);
2958 int btrfs_search_slot_for_read(struct btrfs_root *root,
2959 const struct btrfs_key *key,
2960 struct btrfs_path *p, int find_higher,
2962 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2963 struct btrfs_root *root, struct extent_buffer *parent,
2964 int start_slot, u64 *last_ret,
2965 struct btrfs_key *progress);
2966 void btrfs_release_path(struct btrfs_path *p);
2967 struct btrfs_path *btrfs_alloc_path(void);
2968 void btrfs_free_path(struct btrfs_path *p);
2970 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2971 struct btrfs_path *path, int slot, int nr);
2972 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2973 struct btrfs_root *root,
2974 struct btrfs_path *path)
2976 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2980 * Describes a batch of items to insert in a btree. This is used by
2981 * btrfs_insert_empty_items().
2983 struct btrfs_item_batch {
2985 * Pointer to an array containing the keys of the items to insert (in
2988 const struct btrfs_key *keys;
2989 /* Pointer to an array containing the data size for each item to insert. */
2990 const u32 *data_sizes;
2992 * The sum of data sizes for all items. The caller can compute this while
2993 * setting up the data_sizes array, so it ends up being more efficient
2994 * than having btrfs_insert_empty_items() or setup_item_for_insert()
2995 * doing it, as it would avoid an extra loop over a potentially large
2996 * array, and in the case of setup_item_for_insert(), we would be doing
2997 * it while holding a write lock on a leaf and often on upper level nodes
2998 * too, unnecessarily increasing the size of a critical section.
3000 u32 total_data_size;
3001 /* Size of the keys and data_sizes arrays (number of items in the batch). */
3005 void btrfs_setup_item_for_insert(struct btrfs_root *root,
3006 struct btrfs_path *path,
3007 const struct btrfs_key *key,
3009 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3010 const struct btrfs_key *key, void *data, u32 data_size);
3011 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
3012 struct btrfs_root *root,
3013 struct btrfs_path *path,
3014 const struct btrfs_item_batch *batch);
3016 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3017 struct btrfs_root *root,
3018 struct btrfs_path *path,
3019 const struct btrfs_key *key,
3022 struct btrfs_item_batch batch;
3025 batch.data_sizes = &data_size;
3026 batch.total_data_size = data_size;
3029 return btrfs_insert_empty_items(trans, root, path, &batch);
3032 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3033 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3036 int btrfs_search_backwards(struct btrfs_root *root, struct btrfs_key *key,
3037 struct btrfs_path *path);
3039 static inline int btrfs_next_old_item(struct btrfs_root *root,
3040 struct btrfs_path *p, u64 time_seq)
3043 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3044 return btrfs_next_old_leaf(root, p, time_seq);
3049 * Search the tree again to find a leaf with greater keys.
3051 * Returns 0 if it found something or 1 if there are no greater leaves.
3052 * Returns < 0 on error.
3054 static inline int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
3056 return btrfs_next_old_leaf(root, path, 0);
3059 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3061 return btrfs_next_old_item(root, p, 0);
3063 int btrfs_leaf_free_space(struct extent_buffer *leaf);
3064 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
3066 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3067 struct btrfs_root *root,
3068 struct extent_buffer *node,
3069 struct extent_buffer *parent);
3070 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3073 * Do it this way so we only ever do one test_bit in the normal case.
3075 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
3076 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
3084 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3085 * anything except sleeping. This function is used to check the status of
3087 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
3088 * since setting and checking for SB_RDONLY in the superblock's flags is not
3091 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
3093 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
3094 btrfs_fs_closing(fs_info);
3097 static inline void btrfs_set_sb_rdonly(struct super_block *sb)
3099 sb->s_flags |= SB_RDONLY;
3100 set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3103 static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
3105 sb->s_flags &= ~SB_RDONLY;
3106 clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3110 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3111 u64 ref_id, u64 dirid, u64 sequence, const char *name,
3113 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3114 u64 ref_id, u64 dirid, u64 *sequence, const char *name,
3116 int btrfs_del_root(struct btrfs_trans_handle *trans,
3117 const struct btrfs_key *key);
3118 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3119 const struct btrfs_key *key,
3120 struct btrfs_root_item *item);
3121 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3122 struct btrfs_root *root,
3123 struct btrfs_key *key,
3124 struct btrfs_root_item *item);
3125 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3126 struct btrfs_path *path, struct btrfs_root_item *root_item,
3127 struct btrfs_key *root_key);
3128 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3129 void btrfs_set_root_node(struct btrfs_root_item *item,
3130 struct extent_buffer *node);
3131 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3132 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3133 struct btrfs_root *root);
3136 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3138 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3140 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3143 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3144 const char *name, int name_len);
3145 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3146 int name_len, struct btrfs_inode *dir,
3147 struct btrfs_key *location, u8 type, u64 index);
3148 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3149 struct btrfs_root *root,
3150 struct btrfs_path *path, u64 dir,
3151 const char *name, int name_len,
3153 struct btrfs_dir_item *
3154 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3155 struct btrfs_root *root,
3156 struct btrfs_path *path, u64 dir,
3157 u64 index, const char *name, int name_len,
3159 struct btrfs_dir_item *
3160 btrfs_search_dir_index_item(struct btrfs_root *root,
3161 struct btrfs_path *path, u64 dirid,
3162 const char *name, int name_len);
3163 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3164 struct btrfs_root *root,
3165 struct btrfs_path *path,
3166 struct btrfs_dir_item *di);
3167 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3168 struct btrfs_root *root,
3169 struct btrfs_path *path, u64 objectid,
3170 const char *name, u16 name_len,
3171 const void *data, u16 data_len);
3172 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3173 struct btrfs_root *root,
3174 struct btrfs_path *path, u64 dir,
3175 const char *name, u16 name_len,
3177 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3178 struct btrfs_path *path,
3183 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3184 struct btrfs_root *root, u64 offset);
3185 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3186 struct btrfs_root *root, u64 offset);
3187 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3190 struct btrfs_dio_private;
3191 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3192 struct btrfs_root *root, u64 bytenr, u64 len);
3193 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3194 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3195 struct btrfs_root *root,
3196 u64 objectid, u64 pos,
3197 u64 disk_offset, u64 disk_num_bytes,
3198 u64 num_bytes, u64 offset, u64 ram_bytes,
3199 u8 compression, u8 encryption, u16 other_encoding);
3200 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3201 struct btrfs_root *root,
3202 struct btrfs_path *path, u64 objectid,
3203 u64 bytenr, int mod);
3204 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3205 struct btrfs_root *root,
3206 struct btrfs_ordered_sum *sums);
3207 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3208 u64 offset, bool one_ordered);
3209 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3210 struct list_head *list, int search_commit);
3211 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3212 const struct btrfs_path *path,
3213 struct btrfs_file_extent_item *fi,
3214 const bool new_inline,
3215 struct extent_map *em);
3216 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3218 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3220 void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3221 u64 btrfs_file_extent_end(const struct btrfs_path *path);
3224 blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3225 int mirror_num, unsigned long bio_flags);
3226 unsigned int btrfs_verify_data_csum(struct btrfs_bio *bbio,
3227 u32 bio_offset, struct page *page,
3228 u64 start, u64 end);
3229 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3230 u64 start, u64 len);
3231 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3232 u64 *orig_start, u64 *orig_block_len,
3233 u64 *ram_bytes, bool strict);
3235 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3236 struct btrfs_inode *inode);
3237 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3238 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3239 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3240 struct btrfs_inode *dir, struct btrfs_inode *inode,
3241 const char *name, int name_len);
3242 int btrfs_add_link(struct btrfs_trans_handle *trans,
3243 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3244 const char *name, int name_len, int add_backref, u64 index);
3245 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3246 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3249 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3250 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3251 bool in_reclaim_context);
3252 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3253 unsigned int extra_bits,
3254 struct extent_state **cached_state);
3255 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3256 struct btrfs_root *new_root,
3257 struct btrfs_root *parent_root,
3258 struct user_namespace *mnt_userns);
3259 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3261 void btrfs_clear_delalloc_extent(struct inode *inode,
3262 struct extent_state *state, unsigned *bits);
3263 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3264 struct extent_state *other);
3265 void btrfs_split_delalloc_extent(struct inode *inode,
3266 struct extent_state *orig, u64 split);
3267 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3268 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3269 int btrfs_readpage(struct file *file, struct page *page);
3270 void btrfs_evict_inode(struct inode *inode);
3271 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3272 struct inode *btrfs_alloc_inode(struct super_block *sb);
3273 void btrfs_destroy_inode(struct inode *inode);
3274 void btrfs_free_inode(struct inode *inode);
3275 int btrfs_drop_inode(struct inode *inode);
3276 int __init btrfs_init_cachep(void);
3277 void __cold btrfs_destroy_cachep(void);
3278 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3279 struct btrfs_root *root, struct btrfs_path *path);
3280 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3281 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3282 struct page *page, size_t pg_offset,
3283 u64 start, u64 end);
3284 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3285 struct btrfs_root *root, struct btrfs_inode *inode);
3286 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3287 struct btrfs_root *root, struct btrfs_inode *inode);
3288 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3289 struct btrfs_inode *inode);
3290 int btrfs_orphan_cleanup(struct btrfs_root *root);
3291 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3292 void btrfs_add_delayed_iput(struct inode *inode);
3293 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3294 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3295 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3296 u64 start, u64 num_bytes, u64 min_size,
3297 loff_t actual_len, u64 *alloc_hint);
3298 int btrfs_prealloc_file_range_trans(struct inode *inode,
3299 struct btrfs_trans_handle *trans, int mode,
3300 u64 start, u64 num_bytes, u64 min_size,
3301 loff_t actual_len, u64 *alloc_hint);
3302 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3303 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3304 struct writeback_control *wbc);
3305 int btrfs_writepage_cow_fixup(struct page *page);
3306 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3307 struct page *page, u64 start,
3308 u64 end, bool uptodate);
3309 ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter,
3310 struct btrfs_ioctl_encoded_io_args *encoded);
3311 ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
3312 const struct btrfs_ioctl_encoded_io_args *encoded);
3314 extern const struct dentry_operations btrfs_dentry_operations;
3315 extern const struct iomap_ops btrfs_dio_iomap_ops;
3316 extern const struct iomap_dio_ops btrfs_dio_ops;
3318 /* Inode locking type flags, by default the exclusive lock is taken */
3319 #define BTRFS_ILOCK_SHARED (1U << 0)
3320 #define BTRFS_ILOCK_TRY (1U << 1)
3321 #define BTRFS_ILOCK_MMAP (1U << 2)
3323 int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3324 void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3325 void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3326 const u64 add_bytes,
3327 const u64 del_bytes);
3330 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3331 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3332 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3333 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3334 struct dentry *dentry, struct fileattr *fa);
3335 int btrfs_ioctl_get_supported_features(void __user *arg);
3336 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3337 int __pure btrfs_is_empty_uuid(u8 *uuid);
3338 int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
3339 struct btrfs_ioctl_defrag_range_args *range,
3340 u64 newer_than, unsigned long max_to_defrag);
3341 void btrfs_get_block_group_info(struct list_head *groups_list,
3342 struct btrfs_ioctl_space_info *space);
3343 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3344 struct btrfs_ioctl_balance_args *bargs);
3345 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3346 enum btrfs_exclusive_operation type);
3347 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3348 enum btrfs_exclusive_operation type);
3349 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3350 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3351 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
3352 enum btrfs_exclusive_operation op);
3356 int __init btrfs_auto_defrag_init(void);
3357 void __cold btrfs_auto_defrag_exit(void);
3358 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3359 struct btrfs_inode *inode, u32 extent_thresh);
3360 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3361 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3362 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3363 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3365 extern const struct file_operations btrfs_file_operations;
3366 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3367 struct btrfs_root *root, struct btrfs_inode *inode,
3368 struct btrfs_drop_extents_args *args);
3369 int btrfs_replace_file_extents(struct btrfs_inode *inode,
3370 struct btrfs_path *path, const u64 start,
3372 struct btrfs_replace_extent_info *extent_info,
3373 struct btrfs_trans_handle **trans_out);
3374 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3375 struct btrfs_inode *inode, u64 start, u64 end);
3376 ssize_t btrfs_do_write_iter(struct kiocb *iocb, struct iov_iter *from,
3377 const struct btrfs_ioctl_encoded_io_args *encoded);
3378 int btrfs_release_file(struct inode *inode, struct file *file);
3379 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3380 size_t num_pages, loff_t pos, size_t write_bytes,
3381 struct extent_state **cached, bool noreserve);
3382 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3383 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3384 size_t *write_bytes);
3385 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3388 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3389 struct btrfs_root *root);
3392 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3393 unsigned long new_flags);
3394 int btrfs_sync_fs(struct super_block *sb, int wait);
3395 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3396 u64 subvol_objectid);
3398 static inline __printf(2, 3) __cold
3399 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3403 #ifdef CONFIG_PRINTK
3406 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3408 #define btrfs_printk(fs_info, fmt, args...) \
3409 btrfs_no_printk(fs_info, fmt, ##args)
3412 #define btrfs_emerg(fs_info, fmt, args...) \
3413 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3414 #define btrfs_alert(fs_info, fmt, args...) \
3415 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3416 #define btrfs_crit(fs_info, fmt, args...) \
3417 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3418 #define btrfs_err(fs_info, fmt, args...) \
3419 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3420 #define btrfs_warn(fs_info, fmt, args...) \
3421 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3422 #define btrfs_notice(fs_info, fmt, args...) \
3423 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3424 #define btrfs_info(fs_info, fmt, args...) \
3425 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3428 * Wrappers that use printk_in_rcu
3430 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3431 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3432 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3433 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3434 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3435 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3436 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3437 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3438 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3439 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3440 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3441 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3442 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3443 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3446 * Wrappers that use a ratelimited printk_in_rcu
3448 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3449 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3450 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3451 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3452 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3453 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3454 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3455 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3456 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3457 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3458 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3459 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3460 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3461 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3464 * Wrappers that use a ratelimited printk
3466 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3467 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3468 #define btrfs_alert_rl(fs_info, fmt, args...) \
3469 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3470 #define btrfs_crit_rl(fs_info, fmt, args...) \
3471 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3472 #define btrfs_err_rl(fs_info, fmt, args...) \
3473 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3474 #define btrfs_warn_rl(fs_info, fmt, args...) \
3475 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3476 #define btrfs_notice_rl(fs_info, fmt, args...) \
3477 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3478 #define btrfs_info_rl(fs_info, fmt, args...) \
3479 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3481 #if defined(CONFIG_DYNAMIC_DEBUG)
3482 #define btrfs_debug(fs_info, fmt, args...) \
3483 _dynamic_func_call_no_desc(fmt, btrfs_printk, \
3484 fs_info, KERN_DEBUG fmt, ##args)
3485 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3486 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \
3487 fs_info, KERN_DEBUG fmt, ##args)
3488 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3489 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \
3490 fs_info, KERN_DEBUG fmt, ##args)
3491 #define btrfs_debug_rl(fs_info, fmt, args...) \
3492 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \
3493 fs_info, KERN_DEBUG fmt, ##args)
3494 #elif defined(DEBUG)
3495 #define btrfs_debug(fs_info, fmt, args...) \
3496 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3497 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3498 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3499 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3500 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3501 #define btrfs_debug_rl(fs_info, fmt, args...) \
3502 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3504 #define btrfs_debug(fs_info, fmt, args...) \
3505 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3506 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3507 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3508 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3509 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3510 #define btrfs_debug_rl(fs_info, fmt, args...) \
3511 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3514 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3517 btrfs_printk(fs_info, fmt, ##args); \
3518 rcu_read_unlock(); \
3521 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \
3524 btrfs_no_printk(fs_info, fmt, ##args); \
3525 rcu_read_unlock(); \
3528 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3530 static DEFINE_RATELIMIT_STATE(_rs, \
3531 DEFAULT_RATELIMIT_INTERVAL, \
3532 DEFAULT_RATELIMIT_BURST); \
3533 if (__ratelimit(&_rs)) \
3534 btrfs_printk(fs_info, fmt, ##args); \
3537 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3540 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3541 rcu_read_unlock(); \
3544 #ifdef CONFIG_BTRFS_ASSERT
3546 static inline void assertfail(const char *expr, const char *file, int line)
3548 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3552 #define ASSERT(expr) \
3553 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3556 static inline void assertfail(const char *expr, const char* file, int line) { }
3557 #define ASSERT(expr) (void)(expr)
3560 #if BITS_PER_LONG == 32
3561 #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3563 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3564 * addresses of extents.
3566 * For 4K page size it's about 10T, for 64K it's 160T.
3568 #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3569 void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3570 void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3574 * Get the correct offset inside the page of extent buffer.
3576 * @eb: target extent buffer
3577 * @start: offset inside the extent buffer
3579 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3581 static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3582 unsigned long offset)
3585 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3586 * to PAGE_SIZE, thus adding it won't cause any difference.
3588 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3589 * to the eb, thus we have to take the eb->start into consideration.
3591 return offset_in_page(offset + eb->start);
3594 static inline unsigned long get_eb_page_index(unsigned long offset)
3597 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3599 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3600 * and have ensured that all tree blocks are contained in one page,
3601 * thus we always get index == 0.
3603 return offset >> PAGE_SHIFT;
3607 * Use that for functions that are conditionally exported for sanity tests but
3610 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3611 #define EXPORT_FOR_TESTS static
3613 #define EXPORT_FOR_TESTS
3617 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3620 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3625 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3626 unsigned int line, int errno, const char *fmt, ...);
3628 const char * __attribute_const__ btrfs_decode_error(int errno);
3631 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3632 const char *function,
3633 unsigned int line, int errno);
3636 * Call btrfs_abort_transaction as early as possible when an error condition is
3637 * detected, that way the exact line number is reported.
3639 #define btrfs_abort_transaction(trans, errno) \
3641 /* Report first abort since mount */ \
3642 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3643 &((trans)->fs_info->fs_state))) { \
3644 if ((errno) != -EIO && (errno) != -EROFS) { \
3645 WARN(1, KERN_DEBUG \
3646 "BTRFS: Transaction aborted (error %d)\n", \
3649 btrfs_debug((trans)->fs_info, \
3650 "Transaction aborted (error %d)", \
3654 __btrfs_abort_transaction((trans), __func__, \
3655 __LINE__, (errno)); \
3658 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3660 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3661 (errno), fmt, ##args); \
3664 #define BTRFS_FS_ERROR(fs_info) (unlikely(test_bit(BTRFS_FS_STATE_ERROR, \
3665 &(fs_info)->fs_state)))
3666 #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \
3667 (unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \
3668 &(fs_info)->fs_state)))
3672 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3673 unsigned int line, int errno, const char *fmt, ...);
3675 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3676 * will panic(). Otherwise we BUG() here.
3678 #define btrfs_panic(fs_info, errno, fmt, args...) \
3680 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3685 /* compatibility and incompatibility defines */
3687 #define btrfs_set_fs_incompat(__fs_info, opt) \
3688 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3691 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3692 u64 flag, const char* name)
3694 struct btrfs_super_block *disk_super;
3697 disk_super = fs_info->super_copy;
3698 features = btrfs_super_incompat_flags(disk_super);
3699 if (!(features & flag)) {
3700 spin_lock(&fs_info->super_lock);
3701 features = btrfs_super_incompat_flags(disk_super);
3702 if (!(features & flag)) {
3704 btrfs_set_super_incompat_flags(disk_super, features);
3706 "setting incompat feature flag for %s (0x%llx)",
3709 spin_unlock(&fs_info->super_lock);
3713 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3714 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3717 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3718 u64 flag, const char* name)
3720 struct btrfs_super_block *disk_super;
3723 disk_super = fs_info->super_copy;
3724 features = btrfs_super_incompat_flags(disk_super);
3725 if (features & flag) {
3726 spin_lock(&fs_info->super_lock);
3727 features = btrfs_super_incompat_flags(disk_super);
3728 if (features & flag) {
3730 btrfs_set_super_incompat_flags(disk_super, features);
3732 "clearing incompat feature flag for %s (0x%llx)",
3735 spin_unlock(&fs_info->super_lock);
3739 #define btrfs_fs_incompat(fs_info, opt) \
3740 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3742 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3744 struct btrfs_super_block *disk_super;
3745 disk_super = fs_info->super_copy;
3746 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3749 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3750 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3753 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3754 u64 flag, const char *name)
3756 struct btrfs_super_block *disk_super;
3759 disk_super = fs_info->super_copy;
3760 features = btrfs_super_compat_ro_flags(disk_super);
3761 if (!(features & flag)) {
3762 spin_lock(&fs_info->super_lock);
3763 features = btrfs_super_compat_ro_flags(disk_super);
3764 if (!(features & flag)) {
3766 btrfs_set_super_compat_ro_flags(disk_super, features);
3768 "setting compat-ro feature flag for %s (0x%llx)",
3771 spin_unlock(&fs_info->super_lock);
3775 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3776 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3779 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3780 u64 flag, const char *name)
3782 struct btrfs_super_block *disk_super;
3785 disk_super = fs_info->super_copy;
3786 features = btrfs_super_compat_ro_flags(disk_super);
3787 if (features & flag) {
3788 spin_lock(&fs_info->super_lock);
3789 features = btrfs_super_compat_ro_flags(disk_super);
3790 if (features & flag) {
3792 btrfs_set_super_compat_ro_flags(disk_super, features);
3794 "clearing compat-ro feature flag for %s (0x%llx)",
3797 spin_unlock(&fs_info->super_lock);
3801 #define btrfs_fs_compat_ro(fs_info, opt) \
3802 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3804 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3806 struct btrfs_super_block *disk_super;
3807 disk_super = fs_info->super_copy;
3808 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3812 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3813 struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu);
3814 int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3815 struct posix_acl *acl, int type);
3816 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3817 struct inode *inode, struct inode *dir);
3819 #define btrfs_get_acl NULL
3820 #define btrfs_set_acl NULL
3821 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3822 struct inode *inode, struct inode *dir)
3829 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3830 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3831 struct btrfs_root *root);
3832 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3833 struct btrfs_root *root);
3834 int btrfs_recover_relocation(struct btrfs_root *root);
3835 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3836 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3837 struct btrfs_root *root, struct extent_buffer *buf,
3838 struct extent_buffer *cow);
3839 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3840 u64 *bytes_to_reserve);
3841 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3842 struct btrfs_pending_snapshot *pending);
3843 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3844 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3846 int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3849 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3850 u64 end, struct btrfs_scrub_progress *progress,
3851 int readonly, int is_dev_replace);
3852 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3853 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3854 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3855 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3856 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3857 struct btrfs_scrub_progress *progress);
3858 static inline void btrfs_init_full_stripe_locks_tree(
3859 struct btrfs_full_stripe_locks_tree *locks_root)
3861 locks_root->root = RB_ROOT;
3862 mutex_init(&locks_root->lock);
3866 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3867 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3868 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3870 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3872 btrfs_bio_counter_sub(fs_info, 1);
3875 static inline int is_fstree(u64 rootid)
3877 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3878 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3879 !btrfs_qgroup_level(rootid)))
3884 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3886 return signal_pending(current);
3890 #ifdef CONFIG_FS_VERITY
3892 extern const struct fsverity_operations btrfs_verityops;
3893 int btrfs_drop_verity_items(struct btrfs_inode *inode);
3895 BTRFS_SETGET_FUNCS(verity_descriptor_encryption, struct btrfs_verity_descriptor_item,
3897 BTRFS_SETGET_FUNCS(verity_descriptor_size, struct btrfs_verity_descriptor_item,
3899 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_encryption,
3900 struct btrfs_verity_descriptor_item, encryption, 8);
3901 BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_size,
3902 struct btrfs_verity_descriptor_item, size, 64);
3906 static inline int btrfs_drop_verity_items(struct btrfs_inode *inode)
3913 /* Sanity test specific functions */
3914 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3915 void btrfs_test_destroy_inode(struct inode *inode);
3916 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3918 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3921 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3927 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
3929 return fs_info->zoned != 0;
3932 static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root)
3934 return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;
3938 * We use page status Private2 to indicate there is an ordered extent with
3941 * Rename the Private2 accessors to Ordered, to improve readability.
3943 #define PageOrdered(page) PagePrivate2(page)
3944 #define SetPageOrdered(page) SetPagePrivate2(page)
3945 #define ClearPageOrdered(page) ClearPagePrivate2(page)