1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2007 Oracle. All rights reserved.
10 #include <linux/sched/signal.h>
11 #include <linux/highmem.h>
13 #include <linux/rwsem.h>
14 #include <linux/semaphore.h>
15 #include <linux/completion.h>
16 #include <linux/backing-dev.h>
17 #include <linux/wait.h>
18 #include <linux/slab.h>
19 #include <trace/events/btrfs.h>
20 #include <asm/unaligned.h>
21 #include <linux/pagemap.h>
22 #include <linux/btrfs.h>
23 #include <linux/btrfs_tree.h>
24 #include <linux/workqueue.h>
25 #include <linux/security.h>
26 #include <linux/sizes.h>
27 #include <linux/dynamic_debug.h>
28 #include <linux/refcount.h>
29 #include <linux/crc32c.h>
30 #include <linux/iomap.h>
31 #include "extent-io-tree.h"
32 #include "extent_io.h"
33 #include "extent_map.h"
34 #include "async-thread.h"
35 #include "block-rsv.h"
38 struct btrfs_trans_handle;
39 struct btrfs_transaction;
40 struct btrfs_pending_snapshot;
41 struct btrfs_delayed_ref_root;
42 struct btrfs_space_info;
43 struct btrfs_block_group;
44 extern struct kmem_cache *btrfs_trans_handle_cachep;
45 extern struct kmem_cache *btrfs_bit_radix_cachep;
46 extern struct kmem_cache *btrfs_path_cachep;
47 extern struct kmem_cache *btrfs_free_space_cachep;
48 extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
49 struct btrfs_ordered_sum;
52 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
55 * Maximum number of mirrors that can be available for all profiles counting
56 * the target device of dev-replace as one. During an active device replace
57 * procedure, the target device of the copy operation is a mirror for the
58 * filesystem data as well that can be used to read data in order to repair
59 * read errors on other disks.
61 * Current value is derived from RAID1C4 with 4 copies.
63 #define BTRFS_MAX_MIRRORS (4 + 1)
65 #define BTRFS_MAX_LEVEL 8
67 #define BTRFS_OLDEST_GENERATION 0ULL
70 * we can actually store much bigger names, but lets not confuse the rest
73 #define BTRFS_NAME_LEN 255
76 * Theoretical limit is larger, but we keep this down to a sane
77 * value. That should limit greatly the possibility of collisions on
80 #define BTRFS_LINK_MAX 65535U
82 #define BTRFS_EMPTY_DIR_SIZE 0
84 /* ioprio of readahead is set to idle */
85 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
87 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M
90 * Use large batch size to reduce overhead of metadata updates. On the reader
91 * side, we only read it when we are close to ENOSPC and the read overhead is
92 * mostly related to the number of CPUs, so it is OK to use arbitrary large
95 #define BTRFS_TOTAL_BYTES_PINNED_BATCH SZ_128M
97 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
100 * Deltas are an effective way to populate global statistics. Give macro names
101 * to make it clear what we're doing. An example is discard_extents in
102 * btrfs_free_space_ctl.
104 #define BTRFS_STAT_NR_ENTRIES 2
105 #define BTRFS_STAT_CURR 0
106 #define BTRFS_STAT_PREV 1
109 * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
111 static inline u32 count_max_extents(u64 size)
113 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
116 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
118 BUG_ON(num_stripes == 0);
119 return sizeof(struct btrfs_chunk) +
120 sizeof(struct btrfs_stripe) * (num_stripes - 1);
124 * Runtime (in-memory) states of filesystem
127 /* Global indicator of serious filesystem errors */
128 BTRFS_FS_STATE_ERROR,
130 * Filesystem is being remounted, allow to skip some operations, like
133 BTRFS_FS_STATE_REMOUNTING,
134 /* Filesystem in RO mode */
136 /* Track if a transaction abort has been reported on this filesystem */
137 BTRFS_FS_STATE_TRANS_ABORTED,
139 * Bio operations should be blocked on this filesystem because a source
140 * or target device is being destroyed as part of a device replace
142 BTRFS_FS_STATE_DEV_REPLACING,
143 /* The btrfs_fs_info created for self-tests */
144 BTRFS_FS_STATE_DUMMY_FS_INFO,
147 #define BTRFS_BACKREF_REV_MAX 256
148 #define BTRFS_BACKREF_REV_SHIFT 56
149 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
150 BTRFS_BACKREF_REV_SHIFT)
152 #define BTRFS_OLD_BACKREF_REV 0
153 #define BTRFS_MIXED_BACKREF_REV 1
156 * every tree block (leaf or node) starts with this header.
158 struct btrfs_header {
159 /* these first four must match the super block */
160 u8 csum[BTRFS_CSUM_SIZE];
161 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
162 __le64 bytenr; /* which block this node is supposed to live in */
165 /* allowed to be different from the super from here on down */
166 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
171 } __attribute__ ((__packed__));
174 * this is a very generous portion of the super block, giving us
175 * room to translate 14 chunks with 3 stripes each.
177 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
180 * just in case we somehow lose the roots and are not able to mount,
181 * we store an array of the roots from previous transactions
184 #define BTRFS_NUM_BACKUP_ROOTS 4
185 struct btrfs_root_backup {
187 __le64 tree_root_gen;
190 __le64 chunk_root_gen;
193 __le64 extent_root_gen;
202 __le64 csum_root_gen;
212 u8 extent_root_level;
216 /* future and to align */
218 } __attribute__ ((__packed__));
221 * the super block basically lists the main trees of the FS
222 * it currently lacks any block count etc etc
224 struct btrfs_super_block {
225 /* the first 4 fields must match struct btrfs_header */
226 u8 csum[BTRFS_CSUM_SIZE];
227 /* FS specific UUID, visible to user */
228 u8 fsid[BTRFS_FSID_SIZE];
229 __le64 bytenr; /* this block number */
232 /* allowed to be different from the btrfs_header from here own down */
239 /* this will help find the new super based on the log root */
240 __le64 log_root_transid;
243 __le64 root_dir_objectid;
247 __le32 __unused_leafsize;
249 __le32 sys_chunk_array_size;
250 __le64 chunk_root_generation;
252 __le64 compat_ro_flags;
253 __le64 incompat_flags;
258 struct btrfs_dev_item dev_item;
260 char label[BTRFS_LABEL_SIZE];
262 __le64 cache_generation;
263 __le64 uuid_tree_generation;
265 /* the UUID written into btree blocks */
266 u8 metadata_uuid[BTRFS_FSID_SIZE];
268 /* future expansion */
270 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
271 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
272 } __attribute__ ((__packed__));
275 * Compat flags that we support. If any incompat flags are set other than the
276 * ones specified below then we will fail to mount
278 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
279 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
280 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
282 #define BTRFS_FEATURE_COMPAT_RO_SUPP \
283 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
284 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
286 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
287 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
289 #define BTRFS_FEATURE_INCOMPAT_SUPP \
290 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
291 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
292 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
293 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
294 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
295 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
296 BTRFS_FEATURE_INCOMPAT_RAID56 | \
297 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
298 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
299 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
300 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
301 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
302 BTRFS_FEATURE_INCOMPAT_ZONED)
304 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
305 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
306 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
309 * A leaf is full of items. offset and size tell us where to find
310 * the item in the leaf (relative to the start of the data area)
313 struct btrfs_disk_key key;
316 } __attribute__ ((__packed__));
319 * leaves have an item area and a data area:
320 * [item0, item1....itemN] [free space] [dataN...data1, data0]
322 * The data is separate from the items to get the keys closer together
326 struct btrfs_header header;
327 struct btrfs_item items[];
328 } __attribute__ ((__packed__));
331 * all non-leaf blocks are nodes, they hold only keys and pointers to
334 struct btrfs_key_ptr {
335 struct btrfs_disk_key key;
338 } __attribute__ ((__packed__));
341 struct btrfs_header header;
342 struct btrfs_key_ptr ptrs[];
343 } __attribute__ ((__packed__));
345 /* Read ahead values for struct btrfs_path.reada */
351 * Similar to READA_FORWARD but unlike it:
353 * 1) It will trigger readahead even for leaves that are not close to
354 * each other on disk;
355 * 2) It also triggers readahead for nodes;
356 * 3) During a search, even when a node or leaf is already in memory, it
357 * will still trigger readahead for other nodes and leaves that follow
360 * This is meant to be used only when we know we are iterating over the
361 * entire tree or a very large part of it.
363 READA_FORWARD_ALWAYS,
367 * btrfs_paths remember the path taken from the root down to the leaf.
368 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
369 * to any other levels that are present.
371 * The slots array records the index of the item or block pointer
372 * used while walking the tree.
375 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
376 int slots[BTRFS_MAX_LEVEL];
377 /* if there is real range locking, this locks field will change */
378 u8 locks[BTRFS_MAX_LEVEL];
380 /* keep some upper locks as we walk down */
384 * set by btrfs_split_item, tells search_slot to keep all locks
385 * and to force calls to keep space in the nodes
387 unsigned int search_for_split:1;
388 unsigned int keep_locks:1;
389 unsigned int skip_locking:1;
390 unsigned int search_commit_root:1;
391 unsigned int need_commit_sem:1;
392 unsigned int skip_release_on_error:1;
394 * Indicate that new item (btrfs_search_slot) is extending already
395 * existing item and ins_len contains only the data size and not item
396 * header (ie. sizeof(struct btrfs_item) is not included).
398 unsigned int search_for_extension:1;
400 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
401 sizeof(struct btrfs_item))
402 struct btrfs_dev_replace {
403 u64 replace_state; /* see #define above */
404 time64_t time_started; /* seconds since 1-Jan-1970 */
405 time64_t time_stopped; /* seconds since 1-Jan-1970 */
406 atomic64_t num_write_errors;
407 atomic64_t num_uncorrectable_read_errors;
410 u64 committed_cursor_left;
411 u64 cursor_left_last_write_of_item;
414 u64 cont_reading_from_srcdev_mode; /* see #define above */
417 int item_needs_writeback;
418 struct btrfs_device *srcdev;
419 struct btrfs_device *tgtdev;
421 struct mutex lock_finishing_cancel_unmount;
422 struct rw_semaphore rwsem;
424 struct btrfs_scrub_progress scrub_progress;
426 struct percpu_counter bio_counter;
427 wait_queue_head_t replace_wait;
431 * free clusters are used to claim free space in relatively large chunks,
432 * allowing us to do less seeky writes. They are used for all metadata
433 * allocations. In ssd_spread mode they are also used for data allocations.
435 struct btrfs_free_cluster {
437 spinlock_t refill_lock;
440 /* largest extent in this cluster */
443 /* first extent starting offset */
446 /* We did a full search and couldn't create a cluster */
449 struct btrfs_block_group *block_group;
451 * when a cluster is allocated from a block group, we put the
452 * cluster onto a list in the block group so that it can
453 * be freed before the block group is freed.
455 struct list_head block_group_list;
458 enum btrfs_caching_type {
462 BTRFS_CACHE_FINISHED,
467 * Tree to record all locked full stripes of a RAID5/6 block group
469 struct btrfs_full_stripe_locks_tree {
474 /* Discard control. */
476 * Async discard uses multiple lists to differentiate the discard filter
477 * parameters. Index 0 is for completely free block groups where we need to
478 * ensure the entire block group is trimmed without being lossy. Indices
479 * afterwards represent monotonically decreasing discard filter sizes to
480 * prioritize what should be discarded next.
482 #define BTRFS_NR_DISCARD_LISTS 3
483 #define BTRFS_DISCARD_INDEX_UNUSED 0
484 #define BTRFS_DISCARD_INDEX_START 1
486 struct btrfs_discard_ctl {
487 struct workqueue_struct *discard_workers;
488 struct delayed_work work;
490 struct btrfs_block_group *block_group;
491 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
493 u64 prev_discard_time;
494 atomic_t discardable_extents;
495 atomic64_t discardable_bytes;
496 u64 max_discard_size;
500 u64 discard_extent_bytes;
501 u64 discard_bitmap_bytes;
502 atomic64_t discard_bytes_saved;
505 enum btrfs_orphan_cleanup_state {
506 ORPHAN_CLEANUP_STARTED = 1,
507 ORPHAN_CLEANUP_DONE = 2,
510 void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
513 struct reloc_control;
515 struct btrfs_fs_devices;
516 struct btrfs_balance_control;
517 struct btrfs_delayed_root;
520 * Block group or device which contains an active swapfile. Used for preventing
521 * unsafe operations while a swapfile is active.
523 * These are sorted on (ptr, inode) (note that a block group or device can
524 * contain more than one swapfile). We compare the pointer values because we
525 * don't actually care what the object is, we just need a quick check whether
526 * the object exists in the rbtree.
528 struct btrfs_swapfile_pin {
533 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
534 * points to a struct btrfs_device.
538 * Only used when 'is_block_group' is true and it is the number of
539 * extents used by a swapfile for this block group ('ptr' field).
544 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
548 BTRFS_FS_CLOSING_START,
549 BTRFS_FS_CLOSING_DONE,
550 BTRFS_FS_LOG_RECOVERING,
552 BTRFS_FS_QUOTA_ENABLED,
553 BTRFS_FS_UPDATE_UUID_TREE_GEN,
554 BTRFS_FS_CREATING_FREE_SPACE_TREE,
558 BTRFS_FS_QUOTA_OVERRIDE,
559 /* Used to record internally whether fs has been frozen */
562 * Indicate that balance has been set up from the ioctl and is in the
563 * main phase. The fs_info::balance_ctl is initialized.
565 BTRFS_FS_BALANCE_RUNNING,
568 * Indicate that relocation of a chunk has started, it's set per chunk
569 * and is toggled between chunks.
570 * Set, tested and cleared while holding fs_info::send_reloc_lock.
572 BTRFS_FS_RELOC_RUNNING,
574 /* Indicate that the cleaner thread is awake and doing something. */
575 BTRFS_FS_CLEANER_RUNNING,
578 * The checksumming has an optimized version and is considered fast,
579 * so we don't need to offload checksums to workqueues.
581 BTRFS_FS_CSUM_IMPL_FAST,
583 /* Indicate that the discard workqueue can service discards. */
584 BTRFS_FS_DISCARD_RUNNING,
586 /* Indicate that we need to cleanup space cache v1 */
587 BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
589 /* Indicate that we can't trust the free space tree for caching yet */
590 BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
592 /* Indicate whether there are any tree modification log users */
593 BTRFS_FS_TREE_MOD_LOG_USERS,
595 #if BITS_PER_LONG == 32
596 /* Indicate if we have error/warn message printed on 32bit systems */
597 BTRFS_FS_32BIT_ERROR,
603 * Exclusive operations (device replace, resize, device add/remove, balance)
605 enum btrfs_exclusive_operation {
607 BTRFS_EXCLOP_BALANCE,
608 BTRFS_EXCLOP_DEV_ADD,
609 BTRFS_EXCLOP_DEV_REMOVE,
610 BTRFS_EXCLOP_DEV_REPLACE,
612 BTRFS_EXCLOP_SWAP_ACTIVATE,
615 struct btrfs_fs_info {
616 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
618 struct btrfs_root *extent_root;
619 struct btrfs_root *tree_root;
620 struct btrfs_root *chunk_root;
621 struct btrfs_root *dev_root;
622 struct btrfs_root *fs_root;
623 struct btrfs_root *csum_root;
624 struct btrfs_root *quota_root;
625 struct btrfs_root *uuid_root;
626 struct btrfs_root *free_space_root;
627 struct btrfs_root *data_reloc_root;
629 /* the log root tree is a directory of all the other log roots */
630 struct btrfs_root *log_root_tree;
632 spinlock_t fs_roots_radix_lock;
633 struct radix_tree_root fs_roots_radix;
635 /* block group cache stuff */
636 spinlock_t block_group_cache_lock;
637 u64 first_logical_byte;
638 struct rb_root block_group_cache_tree;
640 /* keep track of unallocated space */
641 atomic64_t free_chunk_space;
643 /* Track ranges which are used by log trees blocks/logged data extents */
644 struct extent_io_tree excluded_extents;
646 /* logical->physical extent mapping */
647 struct extent_map_tree mapping_tree;
650 * block reservation for extent, checksum, root tree and
651 * delayed dir index item
653 struct btrfs_block_rsv global_block_rsv;
654 /* block reservation for metadata operations */
655 struct btrfs_block_rsv trans_block_rsv;
656 /* block reservation for chunk tree */
657 struct btrfs_block_rsv chunk_block_rsv;
658 /* block reservation for delayed operations */
659 struct btrfs_block_rsv delayed_block_rsv;
660 /* block reservation for delayed refs */
661 struct btrfs_block_rsv delayed_refs_rsv;
663 struct btrfs_block_rsv empty_block_rsv;
666 u64 last_trans_committed;
667 u64 avg_delayed_ref_runtime;
670 * this is updated to the current trans every time a full commit
671 * is required instead of the faster short fsync log commits
673 u64 last_trans_log_full_commit;
674 unsigned long mount_opt;
676 * Track requests for actions that need to be done during transaction
677 * commit (like for some mount options).
679 unsigned long pending_changes;
680 unsigned long compress_type:4;
681 unsigned int compress_level;
684 * It is a suggestive number, the read side is safe even it gets a
685 * wrong number because we will write out the data into a regular
686 * extent. The write side(mount/remount) is under ->s_umount lock,
687 * so it is also safe.
691 struct btrfs_transaction *running_transaction;
692 wait_queue_head_t transaction_throttle;
693 wait_queue_head_t transaction_wait;
694 wait_queue_head_t transaction_blocked_wait;
695 wait_queue_head_t async_submit_wait;
698 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
699 * when they are updated.
701 * Because we do not clear the flags for ever, so we needn't use
702 * the lock on the read side.
704 * We also needn't use the lock when we mount the fs, because
705 * there is no other task which will update the flag.
707 spinlock_t super_lock;
708 struct btrfs_super_block *super_copy;
709 struct btrfs_super_block *super_for_commit;
710 struct super_block *sb;
711 struct inode *btree_inode;
712 struct mutex tree_log_mutex;
713 struct mutex transaction_kthread_mutex;
714 struct mutex cleaner_mutex;
715 struct mutex chunk_mutex;
718 * this is taken to make sure we don't set block groups ro after
719 * the free space cache has been allocated on them
721 struct mutex ro_block_group_mutex;
723 /* this is used during read/modify/write to make sure
724 * no two ios are trying to mod the same stripe at the same
727 struct btrfs_stripe_hash_table *stripe_hash_table;
730 * this protects the ordered operations list only while we are
731 * processing all of the entries on it. This way we make
732 * sure the commit code doesn't find the list temporarily empty
733 * because another function happens to be doing non-waiting preflush
734 * before jumping into the main commit.
736 struct mutex ordered_operations_mutex;
738 struct rw_semaphore commit_root_sem;
740 struct rw_semaphore cleanup_work_sem;
742 struct rw_semaphore subvol_sem;
744 spinlock_t trans_lock;
746 * the reloc mutex goes with the trans lock, it is taken
747 * during commit to protect us from the relocation code
749 struct mutex reloc_mutex;
751 struct list_head trans_list;
752 struct list_head dead_roots;
753 struct list_head caching_block_groups;
755 spinlock_t delayed_iput_lock;
756 struct list_head delayed_iputs;
757 atomic_t nr_delayed_iputs;
758 wait_queue_head_t delayed_iputs_wait;
760 atomic64_t tree_mod_seq;
762 /* this protects tree_mod_log and tree_mod_seq_list */
763 rwlock_t tree_mod_log_lock;
764 struct rb_root tree_mod_log;
765 struct list_head tree_mod_seq_list;
767 atomic_t async_delalloc_pages;
770 * this is used to protect the following list -- ordered_roots.
772 spinlock_t ordered_root_lock;
775 * all fs/file tree roots in which there are data=ordered extents
776 * pending writeback are added into this list.
778 * these can span multiple transactions and basically include
779 * every dirty data page that isn't from nodatacow
781 struct list_head ordered_roots;
783 struct mutex delalloc_root_mutex;
784 spinlock_t delalloc_root_lock;
785 /* all fs/file tree roots that have delalloc inodes. */
786 struct list_head delalloc_roots;
789 * there is a pool of worker threads for checksumming during writes
790 * and a pool for checksumming after reads. This is because readers
791 * can run with FS locks held, and the writers may be waiting for
792 * those locks. We don't want ordering in the pending list to cause
793 * deadlocks, and so the two are serviced separately.
795 * A third pool does submit_bio to avoid deadlocking with the other
798 struct btrfs_workqueue *workers;
799 struct btrfs_workqueue *delalloc_workers;
800 struct btrfs_workqueue *flush_workers;
801 struct btrfs_workqueue *endio_workers;
802 struct btrfs_workqueue *endio_meta_workers;
803 struct btrfs_workqueue *endio_raid56_workers;
804 struct btrfs_workqueue *rmw_workers;
805 struct btrfs_workqueue *endio_meta_write_workers;
806 struct btrfs_workqueue *endio_write_workers;
807 struct btrfs_workqueue *endio_freespace_worker;
808 struct btrfs_workqueue *caching_workers;
809 struct btrfs_workqueue *readahead_workers;
812 * fixup workers take dirty pages that didn't properly go through
813 * the cow mechanism and make them safe to write. It happens
814 * for the sys_munmap function call path
816 struct btrfs_workqueue *fixup_workers;
817 struct btrfs_workqueue *delayed_workers;
819 struct task_struct *transaction_kthread;
820 struct task_struct *cleaner_kthread;
821 u32 thread_pool_size;
823 struct kobject *space_info_kobj;
824 struct kobject *qgroups_kobj;
826 /* used to keep from writing metadata until there is a nice batch */
827 struct percpu_counter dirty_metadata_bytes;
828 struct percpu_counter delalloc_bytes;
829 struct percpu_counter ordered_bytes;
830 s32 dirty_metadata_batch;
833 struct list_head dirty_cowonly_roots;
835 struct btrfs_fs_devices *fs_devices;
838 * The space_info list is effectively read only after initial
839 * setup. It is populated at mount time and cleaned up after
840 * all block groups are removed. RCU is used to protect it.
842 struct list_head space_info;
844 struct btrfs_space_info *data_sinfo;
846 struct reloc_control *reloc_ctl;
848 /* data_alloc_cluster is only used in ssd_spread mode */
849 struct btrfs_free_cluster data_alloc_cluster;
851 /* all metadata allocations go through this cluster */
852 struct btrfs_free_cluster meta_alloc_cluster;
854 /* auto defrag inodes go here */
855 spinlock_t defrag_inodes_lock;
856 struct rb_root defrag_inodes;
857 atomic_t defrag_running;
859 /* Used to protect avail_{data, metadata, system}_alloc_bits */
860 seqlock_t profiles_lock;
862 * these three are in extended format (availability of single
863 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
864 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
866 u64 avail_data_alloc_bits;
867 u64 avail_metadata_alloc_bits;
868 u64 avail_system_alloc_bits;
870 /* restriper state */
871 spinlock_t balance_lock;
872 struct mutex balance_mutex;
873 atomic_t balance_pause_req;
874 atomic_t balance_cancel_req;
875 struct btrfs_balance_control *balance_ctl;
876 wait_queue_head_t balance_wait_q;
878 /* Cancellation requests for chunk relocation */
879 atomic_t reloc_cancel_req;
881 u32 data_chunk_allocations;
886 /* private scrub information */
887 struct mutex scrub_lock;
888 atomic_t scrubs_running;
889 atomic_t scrub_pause_req;
890 atomic_t scrubs_paused;
891 atomic_t scrub_cancel_req;
892 wait_queue_head_t scrub_pause_wait;
894 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
897 refcount_t scrub_workers_refcnt;
898 struct btrfs_workqueue *scrub_workers;
899 struct btrfs_workqueue *scrub_wr_completion_workers;
900 struct btrfs_workqueue *scrub_parity_workers;
902 struct btrfs_discard_ctl discard_ctl;
904 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
905 u32 check_integrity_print_mask;
907 /* is qgroup tracking in a consistent state? */
910 /* holds configuration and tracking. Protected by qgroup_lock */
911 struct rb_root qgroup_tree;
912 spinlock_t qgroup_lock;
915 * used to avoid frequently calling ulist_alloc()/ulist_free()
916 * when doing qgroup accounting, it must be protected by qgroup_lock.
918 struct ulist *qgroup_ulist;
921 * Protect user change for quota operations. If a transaction is needed,
922 * it must be started before locking this lock.
924 struct mutex qgroup_ioctl_lock;
926 /* list of dirty qgroups to be written at next commit */
927 struct list_head dirty_qgroups;
929 /* used by qgroup for an efficient tree traversal */
932 /* qgroup rescan items */
933 struct mutex qgroup_rescan_lock; /* protects the progress item */
934 struct btrfs_key qgroup_rescan_progress;
935 struct btrfs_workqueue *qgroup_rescan_workers;
936 struct completion qgroup_rescan_completion;
937 struct btrfs_work qgroup_rescan_work;
938 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */
940 /* filesystem state */
941 unsigned long fs_state;
943 struct btrfs_delayed_root *delayed_root;
946 spinlock_t reada_lock;
947 struct radix_tree_root reada_tree;
949 /* readahead works cnt */
950 atomic_t reada_works_cnt;
952 /* Extent buffer radix tree */
953 spinlock_t buffer_lock;
954 /* Entries are eb->start / sectorsize */
955 struct radix_tree_root buffer_radix;
957 /* next backup root to be overwritten */
958 int backup_root_index;
960 /* device replace state */
961 struct btrfs_dev_replace dev_replace;
963 struct semaphore uuid_tree_rescan_sem;
965 /* Used to reclaim the metadata space in the background. */
966 struct work_struct async_reclaim_work;
967 struct work_struct async_data_reclaim_work;
968 struct work_struct preempt_reclaim_work;
970 /* Reclaim partially filled block groups in the background */
971 struct work_struct reclaim_bgs_work;
972 struct list_head reclaim_bgs;
973 int bg_reclaim_threshold;
975 spinlock_t unused_bgs_lock;
976 struct list_head unused_bgs;
977 struct mutex unused_bg_unpin_mutex;
978 /* Protect block groups that are going to be deleted */
979 struct mutex reclaim_bgs_lock;
981 /* Cached block sizes */
984 /* ilog2 of sectorsize, use to avoid 64bit division */
990 /* Block groups and devices containing active swapfiles. */
991 spinlock_t swapfile_pins_lock;
992 struct rb_root swapfile_pins;
994 struct crypto_shash *csum_shash;
996 spinlock_t send_reloc_lock;
998 * Number of send operations in progress.
999 * Updated while holding fs_info::send_reloc_lock.
1001 int send_in_progress;
1003 /* Type of exclusive operation running, protected by super_lock */
1004 enum btrfs_exclusive_operation exclusive_operation;
1007 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1008 * if the mode is enabled
1015 struct mutex zoned_meta_io_lock;
1016 spinlock_t treelog_bg_lock;
1019 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1020 spinlock_t ref_verify_lock;
1021 struct rb_root block_tree;
1024 #ifdef CONFIG_BTRFS_DEBUG
1025 struct kobject *debug_kobj;
1026 struct kobject *discard_debug_kobj;
1027 struct list_head allocated_roots;
1029 spinlock_t eb_leak_lock;
1030 struct list_head allocated_ebs;
1034 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1036 return sb->s_fs_info;
1040 * The state of btrfs root
1044 * btrfs_record_root_in_trans is a multi-step process, and it can race
1045 * with the balancing code. But the race is very small, and only the
1046 * first time the root is added to each transaction. So IN_TRANS_SETUP
1047 * is used to tell us when more checks are required
1049 BTRFS_ROOT_IN_TRANS_SETUP,
1052 * Set if tree blocks of this root can be shared by other roots.
1053 * Only subvolume trees and their reloc trees have this bit set.
1054 * Conflicts with TRACK_DIRTY bit.
1056 * This affects two things:
1058 * - How balance works
1059 * For shareable roots, we need to use reloc tree and do path
1060 * replacement for balance, and need various pre/post hooks for
1061 * snapshot creation to handle them.
1063 * While for non-shareable trees, we just simply do a tree search
1066 * - How dirty roots are tracked
1067 * For shareable roots, btrfs_record_root_in_trans() is needed to
1068 * track them, while non-subvolume roots have TRACK_DIRTY bit, they
1069 * don't need to set this manually.
1071 BTRFS_ROOT_SHAREABLE,
1072 BTRFS_ROOT_TRACK_DIRTY,
1073 BTRFS_ROOT_IN_RADIX,
1074 BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1075 BTRFS_ROOT_DEFRAG_RUNNING,
1076 BTRFS_ROOT_FORCE_COW,
1077 BTRFS_ROOT_MULTI_LOG_TASKS,
1079 BTRFS_ROOT_DELETING,
1082 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1084 * Set for the subvolume tree owning the reloc tree.
1086 BTRFS_ROOT_DEAD_RELOC_TREE,
1087 /* Mark dead root stored on device whose cleanup needs to be resumed */
1088 BTRFS_ROOT_DEAD_TREE,
1089 /* The root has a log tree. Used for subvolume roots and the tree root. */
1090 BTRFS_ROOT_HAS_LOG_TREE,
1091 /* Qgroup flushing is in progress */
1092 BTRFS_ROOT_QGROUP_FLUSHING,
1096 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1097 * code. For detail check comment in fs/btrfs/qgroup.c.
1099 struct btrfs_qgroup_swapped_blocks {
1101 /* RM_EMPTY_ROOT() of above blocks[] */
1103 struct rb_root blocks[BTRFS_MAX_LEVEL];
1107 * in ram representation of the tree. extent_root is used for all allocations
1108 * and for the extent tree extent_root root.
1111 struct extent_buffer *node;
1113 struct extent_buffer *commit_root;
1114 struct btrfs_root *log_root;
1115 struct btrfs_root *reloc_root;
1117 unsigned long state;
1118 struct btrfs_root_item root_item;
1119 struct btrfs_key root_key;
1120 struct btrfs_fs_info *fs_info;
1121 struct extent_io_tree dirty_log_pages;
1123 struct mutex objectid_mutex;
1125 spinlock_t accounting_lock;
1126 struct btrfs_block_rsv *block_rsv;
1128 struct mutex log_mutex;
1129 wait_queue_head_t log_writer_wait;
1130 wait_queue_head_t log_commit_wait[2];
1131 struct list_head log_ctxs[2];
1132 /* Used only for log trees of subvolumes, not for the log root tree */
1133 atomic_t log_writers;
1134 atomic_t log_commit[2];
1135 /* Used only for log trees of subvolumes, not for the log root tree */
1138 /* No matter the commit succeeds or not*/
1139 int log_transid_committed;
1140 /* Just be updated when the commit succeeds. */
1141 int last_log_commit;
1142 pid_t log_start_pid;
1150 struct btrfs_key defrag_progress;
1151 struct btrfs_key defrag_max;
1153 /* The dirty list is only used by non-shareable roots */
1154 struct list_head dirty_list;
1156 struct list_head root_list;
1158 spinlock_t log_extents_lock[2];
1159 struct list_head logged_list[2];
1161 int orphan_cleanup_state;
1163 spinlock_t inode_lock;
1164 /* red-black tree that keeps track of in-memory inodes */
1165 struct rb_root inode_tree;
1168 * radix tree that keeps track of delayed nodes of every inode,
1169 * protected by inode_lock
1171 struct radix_tree_root delayed_nodes_tree;
1173 * right now this just gets used so that a root has its own devid
1174 * for stat. It may be used for more later
1178 spinlock_t root_item_lock;
1181 struct mutex delalloc_mutex;
1182 spinlock_t delalloc_lock;
1184 * all of the inodes that have delalloc bytes. It is possible for
1185 * this list to be empty even when there is still dirty data=ordered
1186 * extents waiting to finish IO.
1188 struct list_head delalloc_inodes;
1189 struct list_head delalloc_root;
1190 u64 nr_delalloc_inodes;
1192 struct mutex ordered_extent_mutex;
1194 * this is used by the balancing code to wait for all the pending
1197 spinlock_t ordered_extent_lock;
1200 * all of the data=ordered extents pending writeback
1201 * these can span multiple transactions and basically include
1202 * every dirty data page that isn't from nodatacow
1204 struct list_head ordered_extents;
1205 struct list_head ordered_root;
1206 u64 nr_ordered_extents;
1209 * Not empty if this subvolume root has gone through tree block swap
1212 * Will be used by reloc_control::dirty_subvol_roots.
1214 struct list_head reloc_dirty_list;
1217 * Number of currently running SEND ioctls to prevent
1218 * manipulation with the read-only status via SUBVOL_SETFLAGS
1220 int send_in_progress;
1222 * Number of currently running deduplication operations that have a
1223 * destination inode belonging to this root. Protected by the lock
1226 int dedupe_in_progress;
1227 /* For exclusion of snapshot creation and nocow writes */
1228 struct btrfs_drew_lock snapshot_lock;
1230 atomic_t snapshot_force_cow;
1232 /* For qgroup metadata reserved space */
1233 spinlock_t qgroup_meta_rsv_lock;
1234 u64 qgroup_meta_rsv_pertrans;
1235 u64 qgroup_meta_rsv_prealloc;
1236 wait_queue_head_t qgroup_flush_wait;
1238 /* Number of active swapfiles */
1239 atomic_t nr_swapfiles;
1241 /* Record pairs of swapped blocks for qgroup */
1242 struct btrfs_qgroup_swapped_blocks swapped_blocks;
1244 /* Used only by log trees, when logging csum items */
1245 struct extent_io_tree log_csum_range;
1247 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1251 #ifdef CONFIG_BTRFS_DEBUG
1252 struct list_head leak_list;
1257 * Structure that conveys information about an extent that is going to replace
1258 * all the extents in a file range.
1260 struct btrfs_replace_extent_info {
1266 /* Pointer to a file extent item of type regular or prealloc. */
1269 * Set to true when attempting to replace a file range with a new extent
1270 * described by this structure, set to false when attempting to clone an
1271 * existing extent into a file range.
1274 /* Meaningful only if is_new_extent is true. */
1275 int qgroup_reserved;
1277 * Meaningful only if is_new_extent is true.
1278 * Used to track how many extent items we have already inserted in a
1279 * subvolume tree that refer to the extent described by this structure,
1280 * so that we know when to create a new delayed ref or update an existing
1286 /* Arguments for btrfs_drop_extents() */
1287 struct btrfs_drop_extents_args {
1288 /* Input parameters */
1291 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1292 * If 'replace_extent' is true, this must not be NULL. Also the path
1293 * is always released except if 'replace_extent' is true and
1294 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1295 * the path is kept locked.
1297 struct btrfs_path *path;
1298 /* Start offset of the range to drop extents from */
1300 /* End (exclusive, last byte + 1) of the range to drop extents from */
1302 /* If true drop all the extent maps in the range */
1305 * If true it means we want to insert a new extent after dropping all
1306 * the extents in the range. If this is true, the 'extent_item_size'
1307 * parameter must be set as well and the 'extent_inserted' field will
1308 * be set to true by btrfs_drop_extents() if it could insert the new
1310 * Note: when this is set to true the path must not be NULL.
1312 bool replace_extent;
1314 * Used if 'replace_extent' is true. Size of the file extent item to
1315 * insert after dropping all existing extents in the range
1317 u32 extent_item_size;
1319 /* Output parameters */
1322 * Set to the minimum between the input parameter 'end' and the end
1323 * (exclusive, last byte + 1) of the last dropped extent. This is always
1324 * set even if btrfs_drop_extents() returns an error.
1328 * The number of allocated bytes found in the range. This can be smaller
1329 * than the range's length when there are holes in the range.
1333 * Only set if 'replace_extent' is true. Set to true if we were able
1334 * to insert a replacement extent after dropping all extents in the
1335 * range, otherwise set to false by btrfs_drop_extents().
1336 * Also, if btrfs_drop_extents() has set this to true it means it
1337 * returned with the path locked, otherwise if it has set this to
1338 * false it has returned with the path released.
1340 bool extent_inserted;
1343 struct btrfs_file_private {
1348 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1351 return info->nodesize - sizeof(struct btrfs_header);
1354 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items)
1356 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1358 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1361 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1363 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1366 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1367 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1368 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1370 return BTRFS_MAX_ITEM_SIZE(info) -
1371 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1374 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1376 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1380 * Flags for mount options.
1382 * Note: don't forget to add new options to btrfs_show_options()
1385 BTRFS_MOUNT_NODATASUM = (1UL << 0),
1386 BTRFS_MOUNT_NODATACOW = (1UL << 1),
1387 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
1388 BTRFS_MOUNT_SSD = (1UL << 3),
1389 BTRFS_MOUNT_DEGRADED = (1UL << 4),
1390 BTRFS_MOUNT_COMPRESS = (1UL << 5),
1391 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
1392 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
1393 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
1394 BTRFS_MOUNT_NOSSD = (1UL << 9),
1395 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
1396 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
1397 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
1398 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
1399 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
1400 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
1401 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
1402 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
1403 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
1404 BTRFS_MOUNT_CHECK_INTEGRITY = (1UL << 19),
1405 BTRFS_MOUNT_CHECK_INTEGRITY_DATA = (1UL << 20),
1406 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 21),
1407 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 22),
1408 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 23),
1409 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 24),
1410 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 25),
1411 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 26),
1412 BTRFS_MOUNT_REF_VERIFY = (1UL << 27),
1413 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 28),
1414 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 29),
1415 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 30),
1418 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1419 #define BTRFS_DEFAULT_MAX_INLINE (2048)
1421 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1422 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1423 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1424 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1427 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1429 if (!btrfs_test_opt(fs_info, opt)) \
1430 btrfs_info(fs_info, fmt, ##args); \
1431 btrfs_set_opt(fs_info->mount_opt, opt); \
1434 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1436 if (btrfs_test_opt(fs_info, opt)) \
1437 btrfs_info(fs_info, fmt, ##args); \
1438 btrfs_clear_opt(fs_info->mount_opt, opt); \
1442 * Requests for changes that need to be done during transaction commit.
1444 * Internal mount options that are used for special handling of the real
1445 * mount options (eg. cannot be set during remount and have to be set during
1446 * transaction commit)
1449 #define BTRFS_PENDING_COMMIT (0)
1451 #define btrfs_test_pending(info, opt) \
1452 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1453 #define btrfs_set_pending(info, opt) \
1454 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1455 #define btrfs_clear_pending(info, opt) \
1456 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1459 * Helpers for setting pending mount option changes.
1461 * Expects corresponding macros
1462 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1464 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1466 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1467 btrfs_info((info), fmt, ##args); \
1468 btrfs_set_pending((info), SET_##opt); \
1469 btrfs_clear_pending((info), CLEAR_##opt); \
1473 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1475 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1476 btrfs_info((info), fmt, ##args); \
1477 btrfs_set_pending((info), CLEAR_##opt); \
1478 btrfs_clear_pending((info), SET_##opt); \
1485 #define BTRFS_INODE_NODATASUM (1 << 0)
1486 #define BTRFS_INODE_NODATACOW (1 << 1)
1487 #define BTRFS_INODE_READONLY (1 << 2)
1488 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1489 #define BTRFS_INODE_PREALLOC (1 << 4)
1490 #define BTRFS_INODE_SYNC (1 << 5)
1491 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1492 #define BTRFS_INODE_APPEND (1 << 7)
1493 #define BTRFS_INODE_NODUMP (1 << 8)
1494 #define BTRFS_INODE_NOATIME (1 << 9)
1495 #define BTRFS_INODE_DIRSYNC (1 << 10)
1496 #define BTRFS_INODE_COMPRESS (1 << 11)
1498 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
1500 #define BTRFS_INODE_FLAG_MASK \
1501 (BTRFS_INODE_NODATASUM | \
1502 BTRFS_INODE_NODATACOW | \
1503 BTRFS_INODE_READONLY | \
1504 BTRFS_INODE_NOCOMPRESS | \
1505 BTRFS_INODE_PREALLOC | \
1506 BTRFS_INODE_SYNC | \
1507 BTRFS_INODE_IMMUTABLE | \
1508 BTRFS_INODE_APPEND | \
1509 BTRFS_INODE_NODUMP | \
1510 BTRFS_INODE_NOATIME | \
1511 BTRFS_INODE_DIRSYNC | \
1512 BTRFS_INODE_COMPRESS | \
1513 BTRFS_INODE_ROOT_ITEM_INIT)
1515 struct btrfs_map_token {
1516 struct extent_buffer *eb;
1518 unsigned long offset;
1521 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1522 ((bytes) >> (fs_info)->sectorsize_bits)
1524 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1525 struct extent_buffer *eb)
1528 token->kaddr = page_address(eb->pages[0]);
1532 /* some macros to generate set/get functions for the struct fields. This
1533 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1536 #define le8_to_cpu(v) (v)
1537 #define cpu_to_le8(v) (v)
1540 static inline u8 get_unaligned_le8(const void *p)
1545 static inline void put_unaligned_le8(u8 val, void *p)
1550 #define read_eb_member(eb, ptr, type, member, result) (\
1551 read_extent_buffer(eb, (char *)(result), \
1552 ((unsigned long)(ptr)) + \
1553 offsetof(type, member), \
1554 sizeof(((type *)0)->member)))
1556 #define write_eb_member(eb, ptr, type, member, result) (\
1557 write_extent_buffer(eb, (char *)(result), \
1558 ((unsigned long)(ptr)) + \
1559 offsetof(type, member), \
1560 sizeof(((type *)0)->member)))
1562 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1563 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
1564 const void *ptr, unsigned long off); \
1565 void btrfs_set_token_##bits(struct btrfs_map_token *token, \
1566 const void *ptr, unsigned long off, \
1568 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
1569 const void *ptr, unsigned long off); \
1570 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
1571 unsigned long off, u##bits val);
1573 DECLARE_BTRFS_SETGET_BITS(8)
1574 DECLARE_BTRFS_SETGET_BITS(16)
1575 DECLARE_BTRFS_SETGET_BITS(32)
1576 DECLARE_BTRFS_SETGET_BITS(64)
1578 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1579 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1582 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1583 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1585 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1588 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1589 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1591 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
1594 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1595 return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1597 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1598 type *s, u##bits val) \
1600 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1601 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
1604 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1605 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1607 const type *p = page_address(eb->pages[0]) + \
1608 offset_in_page(eb->start); \
1609 return get_unaligned_le##bits(&p->member); \
1611 static inline void btrfs_set_##name(const struct extent_buffer *eb, \
1614 type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1615 put_unaligned_le##bits(val, &p->member); \
1618 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1619 static inline u##bits btrfs_##name(const type *s) \
1621 return get_unaligned_le##bits(&s->member); \
1623 static inline void btrfs_set_##name(type *s, u##bits val) \
1625 put_unaligned_le##bits(val, &s->member); \
1628 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1629 struct btrfs_dev_item *s)
1631 BUILD_BUG_ON(sizeof(u64) !=
1632 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1633 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1636 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1637 struct btrfs_dev_item *s,
1640 BUILD_BUG_ON(sizeof(u64) !=
1641 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1642 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1643 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1647 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1648 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1649 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1650 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1651 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1653 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1654 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1655 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1656 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1657 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1658 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1660 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1661 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1663 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1665 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1667 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1669 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1671 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1672 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1674 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1676 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1678 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1681 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1683 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1686 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1688 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1691 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1692 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1693 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1694 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1695 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1696 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1697 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1698 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1699 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1700 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1701 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1703 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1705 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1708 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1709 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1710 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1712 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1714 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1716 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1718 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1719 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1721 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1723 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1724 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1726 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1729 unsigned long offset = (unsigned long)c;
1730 offset += offsetof(struct btrfs_chunk, stripe);
1731 offset += nr * sizeof(struct btrfs_stripe);
1732 return (struct btrfs_stripe *)offset;
1735 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1737 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1740 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1741 struct btrfs_chunk *c, int nr)
1743 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1746 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1747 struct btrfs_chunk *c, int nr)
1749 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1752 /* struct btrfs_block_group_item */
1753 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1755 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1757 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1758 struct btrfs_block_group_item, chunk_objectid, 64);
1760 BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1761 struct btrfs_block_group_item, chunk_objectid, 64);
1762 BTRFS_SETGET_FUNCS(block_group_flags,
1763 struct btrfs_block_group_item, flags, 64);
1764 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1765 struct btrfs_block_group_item, flags, 64);
1767 /* struct btrfs_free_space_info */
1768 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1770 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1772 /* struct btrfs_inode_ref */
1773 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1774 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1776 /* struct btrfs_inode_extref */
1777 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1778 parent_objectid, 64);
1779 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1781 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1783 /* struct btrfs_inode_item */
1784 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1785 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1786 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1787 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1788 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1789 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1790 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1791 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1792 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1793 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1794 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1795 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1796 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1798 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1800 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1802 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1803 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1805 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1807 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1808 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1809 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1810 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1811 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1812 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1813 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1814 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1815 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1816 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1818 /* struct btrfs_dev_extent */
1819 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1821 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1822 chunk_objectid, 64);
1823 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1825 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1826 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1827 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1829 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1831 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1833 static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1834 struct btrfs_tree_block_info *item,
1835 struct btrfs_disk_key *key)
1837 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1840 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1841 struct btrfs_tree_block_info *item,
1842 struct btrfs_disk_key *key)
1844 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1847 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1849 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1851 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1853 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1856 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1859 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1861 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1864 static inline u32 btrfs_extent_inline_ref_size(int type)
1866 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1867 type == BTRFS_SHARED_BLOCK_REF_KEY)
1868 return sizeof(struct btrfs_extent_inline_ref);
1869 if (type == BTRFS_SHARED_DATA_REF_KEY)
1870 return sizeof(struct btrfs_shared_data_ref) +
1871 sizeof(struct btrfs_extent_inline_ref);
1872 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1873 return sizeof(struct btrfs_extent_data_ref) +
1874 offsetof(struct btrfs_extent_inline_ref, offset);
1878 /* struct btrfs_node */
1879 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1880 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1881 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1883 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1886 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1889 ptr = offsetof(struct btrfs_node, ptrs) +
1890 sizeof(struct btrfs_key_ptr) * nr;
1891 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1894 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1898 ptr = offsetof(struct btrfs_node, ptrs) +
1899 sizeof(struct btrfs_key_ptr) * nr;
1900 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1903 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1906 ptr = offsetof(struct btrfs_node, ptrs) +
1907 sizeof(struct btrfs_key_ptr) * nr;
1908 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1911 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1915 ptr = offsetof(struct btrfs_node, ptrs) +
1916 sizeof(struct btrfs_key_ptr) * nr;
1917 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1920 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1922 return offsetof(struct btrfs_node, ptrs) +
1923 sizeof(struct btrfs_key_ptr) * nr;
1926 void btrfs_node_key(const struct extent_buffer *eb,
1927 struct btrfs_disk_key *disk_key, int nr);
1929 static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1930 struct btrfs_disk_key *disk_key, int nr)
1933 ptr = btrfs_node_key_ptr_offset(nr);
1934 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1935 struct btrfs_key_ptr, key, disk_key);
1938 /* struct btrfs_item */
1939 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1940 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1941 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1942 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1944 static inline unsigned long btrfs_item_nr_offset(int nr)
1946 return offsetof(struct btrfs_leaf, items) +
1947 sizeof(struct btrfs_item) * nr;
1950 static inline struct btrfs_item *btrfs_item_nr(int nr)
1952 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1955 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1956 struct btrfs_item *item)
1958 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1961 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1963 return btrfs_item_end(eb, btrfs_item_nr(nr));
1966 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1968 return btrfs_item_offset(eb, btrfs_item_nr(nr));
1971 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1973 return btrfs_item_size(eb, btrfs_item_nr(nr));
1976 static inline void btrfs_item_key(const struct extent_buffer *eb,
1977 struct btrfs_disk_key *disk_key, int nr)
1979 struct btrfs_item *item = btrfs_item_nr(nr);
1980 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1983 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1984 struct btrfs_disk_key *disk_key, int nr)
1986 struct btrfs_item *item = btrfs_item_nr(nr);
1987 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1990 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1993 * struct btrfs_root_ref
1995 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1996 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1997 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1999 /* struct btrfs_dir_item */
2000 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2001 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2002 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2003 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2004 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2005 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2007 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2009 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2012 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2013 const struct btrfs_dir_item *item,
2014 struct btrfs_disk_key *key)
2016 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2019 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2020 struct btrfs_dir_item *item,
2021 const struct btrfs_disk_key *key)
2023 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2026 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2028 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2030 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2033 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2034 const struct btrfs_free_space_header *h,
2035 struct btrfs_disk_key *key)
2037 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2040 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2041 struct btrfs_free_space_header *h,
2042 const struct btrfs_disk_key *key)
2044 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2047 /* struct btrfs_disk_key */
2048 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2050 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2051 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2053 #ifdef __LITTLE_ENDIAN
2056 * Optimized helpers for little-endian architectures where CPU and on-disk
2057 * structures have the same endianness and we can skip conversions.
2060 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2061 const struct btrfs_disk_key *disk_key)
2063 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2066 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2067 const struct btrfs_key *cpu_key)
2069 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2072 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2073 struct btrfs_key *cpu_key, int nr)
2075 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2077 btrfs_node_key(eb, disk_key, nr);
2080 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2081 struct btrfs_key *cpu_key, int nr)
2083 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2085 btrfs_item_key(eb, disk_key, nr);
2088 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2089 const struct btrfs_dir_item *item,
2090 struct btrfs_key *cpu_key)
2092 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2094 btrfs_dir_item_key(eb, item, disk_key);
2099 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2100 const struct btrfs_disk_key *disk)
2102 cpu->offset = le64_to_cpu(disk->offset);
2103 cpu->type = disk->type;
2104 cpu->objectid = le64_to_cpu(disk->objectid);
2107 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2108 const struct btrfs_key *cpu)
2110 disk->offset = cpu_to_le64(cpu->offset);
2111 disk->type = cpu->type;
2112 disk->objectid = cpu_to_le64(cpu->objectid);
2115 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2116 struct btrfs_key *key, int nr)
2118 struct btrfs_disk_key disk_key;
2119 btrfs_node_key(eb, &disk_key, nr);
2120 btrfs_disk_key_to_cpu(key, &disk_key);
2123 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2124 struct btrfs_key *key, int nr)
2126 struct btrfs_disk_key disk_key;
2127 btrfs_item_key(eb, &disk_key, nr);
2128 btrfs_disk_key_to_cpu(key, &disk_key);
2131 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2132 const struct btrfs_dir_item *item,
2133 struct btrfs_key *key)
2135 struct btrfs_disk_key disk_key;
2136 btrfs_dir_item_key(eb, item, &disk_key);
2137 btrfs_disk_key_to_cpu(key, &disk_key);
2142 /* struct btrfs_header */
2143 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2144 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2146 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2147 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2148 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2149 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2150 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2152 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2153 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2155 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2157 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2159 return (btrfs_header_flags(eb) & flag) == flag;
2162 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2164 u64 flags = btrfs_header_flags(eb);
2165 btrfs_set_header_flags(eb, flags | flag);
2168 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2170 u64 flags = btrfs_header_flags(eb);
2171 btrfs_set_header_flags(eb, flags & ~flag);
2174 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2176 u64 flags = btrfs_header_flags(eb);
2177 return flags >> BTRFS_BACKREF_REV_SHIFT;
2180 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2183 u64 flags = btrfs_header_flags(eb);
2184 flags &= ~BTRFS_BACKREF_REV_MASK;
2185 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2186 btrfs_set_header_flags(eb, flags);
2189 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2191 return btrfs_header_level(eb) == 0;
2194 /* struct btrfs_root_item */
2195 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2197 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2198 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2199 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2201 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2203 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2204 BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2205 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2206 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2207 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2208 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2209 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2210 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2211 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2213 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2215 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2217 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2219 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2221 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2224 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2226 /* Byte-swap the constant at compile time, root_item::flags is LE */
2227 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2230 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2232 /* Byte-swap the constant at compile time, root_item::flags is LE */
2233 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2236 /* struct btrfs_root_backup */
2237 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2239 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2241 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2242 tree_root_level, 8);
2244 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2246 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2247 chunk_root_gen, 64);
2248 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2249 chunk_root_level, 8);
2251 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2253 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2254 extent_root_gen, 64);
2255 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2256 extent_root_level, 8);
2258 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2260 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2262 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2265 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2267 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2269 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2272 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2274 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2276 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2277 csum_root_level, 8);
2278 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2280 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2282 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2285 /* struct btrfs_balance_item */
2286 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2288 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2289 const struct btrfs_balance_item *bi,
2290 struct btrfs_disk_balance_args *ba)
2292 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2295 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2296 struct btrfs_balance_item *bi,
2297 const struct btrfs_disk_balance_args *ba)
2299 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2302 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2303 const struct btrfs_balance_item *bi,
2304 struct btrfs_disk_balance_args *ba)
2306 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2309 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2310 struct btrfs_balance_item *bi,
2311 const struct btrfs_disk_balance_args *ba)
2313 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2316 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2317 const struct btrfs_balance_item *bi,
2318 struct btrfs_disk_balance_args *ba)
2320 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2323 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2324 struct btrfs_balance_item *bi,
2325 const struct btrfs_disk_balance_args *ba)
2327 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2331 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2332 const struct btrfs_disk_balance_args *disk)
2334 memset(cpu, 0, sizeof(*cpu));
2336 cpu->profiles = le64_to_cpu(disk->profiles);
2337 cpu->usage = le64_to_cpu(disk->usage);
2338 cpu->devid = le64_to_cpu(disk->devid);
2339 cpu->pstart = le64_to_cpu(disk->pstart);
2340 cpu->pend = le64_to_cpu(disk->pend);
2341 cpu->vstart = le64_to_cpu(disk->vstart);
2342 cpu->vend = le64_to_cpu(disk->vend);
2343 cpu->target = le64_to_cpu(disk->target);
2344 cpu->flags = le64_to_cpu(disk->flags);
2345 cpu->limit = le64_to_cpu(disk->limit);
2346 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2347 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2351 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2352 const struct btrfs_balance_args *cpu)
2354 memset(disk, 0, sizeof(*disk));
2356 disk->profiles = cpu_to_le64(cpu->profiles);
2357 disk->usage = cpu_to_le64(cpu->usage);
2358 disk->devid = cpu_to_le64(cpu->devid);
2359 disk->pstart = cpu_to_le64(cpu->pstart);
2360 disk->pend = cpu_to_le64(cpu->pend);
2361 disk->vstart = cpu_to_le64(cpu->vstart);
2362 disk->vend = cpu_to_le64(cpu->vend);
2363 disk->target = cpu_to_le64(cpu->target);
2364 disk->flags = cpu_to_le64(cpu->flags);
2365 disk->limit = cpu_to_le64(cpu->limit);
2366 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2367 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2370 /* struct btrfs_super_block */
2371 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2372 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2373 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2375 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2376 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2377 struct btrfs_super_block, sys_chunk_array_size, 32);
2378 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2379 struct btrfs_super_block, chunk_root_generation, 64);
2380 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2382 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2384 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2385 chunk_root_level, 8);
2386 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2388 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2389 log_root_transid, 64);
2390 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2392 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2394 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2396 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2398 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2400 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2402 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2403 root_dir_objectid, 64);
2404 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2406 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2408 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2409 compat_ro_flags, 64);
2410 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2411 incompat_flags, 64);
2412 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2414 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2415 cache_generation, 64);
2416 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2417 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2418 uuid_tree_generation, 64);
2420 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2421 const char *btrfs_super_csum_name(u16 csum_type);
2422 const char *btrfs_super_csum_driver(u16 csum_type);
2423 size_t __attribute_const__ btrfs_get_num_csums(void);
2427 * The leaf data grows from end-to-front in the node.
2428 * this returns the address of the start of the last item,
2429 * which is the stop of the leaf data stack
2431 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2433 u32 nr = btrfs_header_nritems(leaf);
2436 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2437 return btrfs_item_offset_nr(leaf, nr - 1);
2440 /* struct btrfs_file_extent_item */
2441 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2443 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2444 struct btrfs_file_extent_item, disk_bytenr, 64);
2445 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2446 struct btrfs_file_extent_item, offset, 64);
2447 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2448 struct btrfs_file_extent_item, generation, 64);
2449 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2450 struct btrfs_file_extent_item, num_bytes, 64);
2451 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2452 struct btrfs_file_extent_item, ram_bytes, 64);
2453 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2454 struct btrfs_file_extent_item, disk_num_bytes, 64);
2455 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2456 struct btrfs_file_extent_item, compression, 8);
2458 static inline unsigned long
2459 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2461 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2464 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2466 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2469 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2470 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2472 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2474 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2475 disk_num_bytes, 64);
2476 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2478 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2480 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2482 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2484 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2486 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2487 other_encoding, 16);
2490 * this returns the number of bytes used by the item on disk, minus the
2491 * size of any extent headers. If a file is compressed on disk, this is
2492 * the compressed size
2494 static inline u32 btrfs_file_extent_inline_item_len(
2495 const struct extent_buffer *eb,
2496 struct btrfs_item *e)
2498 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2501 /* btrfs_qgroup_status_item */
2502 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2504 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2506 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2508 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2511 /* btrfs_qgroup_info_item */
2512 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2514 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2515 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2517 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2518 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2521 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2522 struct btrfs_qgroup_info_item, generation, 64);
2523 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2525 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2526 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2527 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2529 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2530 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2532 /* btrfs_qgroup_limit_item */
2533 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2535 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2537 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2539 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2541 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2544 /* btrfs_dev_replace_item */
2545 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2546 struct btrfs_dev_replace_item, src_devid, 64);
2547 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2548 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2550 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2552 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2554 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2556 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2557 num_write_errors, 64);
2558 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2559 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2561 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2563 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2566 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2567 struct btrfs_dev_replace_item, src_devid, 64);
2568 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2569 struct btrfs_dev_replace_item,
2570 cont_reading_from_srcdev_mode, 64);
2571 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2572 struct btrfs_dev_replace_item, replace_state, 64);
2573 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2574 struct btrfs_dev_replace_item, time_started, 64);
2575 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2576 struct btrfs_dev_replace_item, time_stopped, 64);
2577 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2578 struct btrfs_dev_replace_item, num_write_errors, 64);
2579 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2580 struct btrfs_dev_replace_item,
2581 num_uncorrectable_read_errors, 64);
2582 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2583 struct btrfs_dev_replace_item, cursor_left, 64);
2584 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2585 struct btrfs_dev_replace_item, cursor_right, 64);
2587 /* helper function to cast into the data area of the leaf. */
2588 #define btrfs_item_ptr(leaf, slot, type) \
2589 ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2590 btrfs_item_offset_nr(leaf, slot)))
2592 #define btrfs_item_ptr_offset(leaf, slot) \
2593 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2594 btrfs_item_offset_nr(leaf, slot)))
2596 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2598 return crc32c(crc, address, length);
2601 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2603 put_unaligned_le32(~crc, result);
2606 static inline u64 btrfs_name_hash(const char *name, int len)
2608 return crc32c((u32)~1, name, len);
2612 * Figure the key offset of an extended inode ref
2614 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2617 return (u64) crc32c(parent_objectid, name, len);
2620 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2622 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2627 enum btrfs_inline_ref_type {
2628 BTRFS_REF_TYPE_INVALID,
2629 BTRFS_REF_TYPE_BLOCK,
2630 BTRFS_REF_TYPE_DATA,
2634 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2635 struct btrfs_extent_inline_ref *iref,
2636 enum btrfs_inline_ref_type is_data);
2637 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2640 * Take the number of bytes to be checksummmed and figure out how many leaves
2641 * it would require to store the csums for that many bytes.
2643 static inline u64 btrfs_csum_bytes_to_leaves(
2644 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2646 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2648 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2652 * Use this if we would be adding new items, as we could split nodes as we cow
2655 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2658 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2662 * Doing a truncate or a modification won't result in new nodes or leaves, just
2663 * what we need for COW.
2665 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2668 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2671 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2672 u64 start, u64 num_bytes);
2673 void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2674 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2675 unsigned long count);
2676 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2677 struct btrfs_delayed_ref_root *delayed_refs,
2678 struct btrfs_delayed_ref_head *head);
2679 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2680 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2681 struct btrfs_fs_info *fs_info, u64 bytenr,
2682 u64 offset, int metadata, u64 *refs, u64 *flags);
2683 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2685 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2686 u64 bytenr, u64 num_bytes);
2687 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2688 int btrfs_cross_ref_exist(struct btrfs_root *root,
2689 u64 objectid, u64 offset, u64 bytenr, bool strict);
2690 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2691 struct btrfs_root *root,
2692 u64 parent, u64 root_objectid,
2693 const struct btrfs_disk_key *key,
2694 int level, u64 hint,
2696 enum btrfs_lock_nesting nest);
2697 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2698 struct btrfs_root *root,
2699 struct extent_buffer *buf,
2700 u64 parent, int last_ref);
2701 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2702 struct btrfs_root *root, u64 owner,
2703 u64 offset, u64 ram_bytes,
2704 struct btrfs_key *ins);
2705 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2706 u64 root_objectid, u64 owner, u64 offset,
2707 struct btrfs_key *ins);
2708 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2709 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2710 struct btrfs_key *ins, int is_data, int delalloc);
2711 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2712 struct extent_buffer *buf, int full_backref);
2713 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2714 struct extent_buffer *buf, int full_backref);
2715 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2716 struct extent_buffer *eb, u64 flags,
2717 int level, int is_data);
2718 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2720 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2721 u64 start, u64 len, int delalloc);
2722 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2724 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2725 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2726 struct btrfs_ref *generic_ref);
2728 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2731 * Different levels for to flush space when doing space reservations.
2733 * The higher the level, the more methods we try to reclaim space.
2735 enum btrfs_reserve_flush_enum {
2736 /* If we are in the transaction, we can't flush anything.*/
2737 BTRFS_RESERVE_NO_FLUSH,
2741 * - Running delayed inode items
2742 * - Allocating a new chunk
2744 BTRFS_RESERVE_FLUSH_LIMIT,
2748 * - Running delayed inode items
2749 * - Running delayed refs
2750 * - Running delalloc and waiting for ordered extents
2751 * - Allocating a new chunk
2753 BTRFS_RESERVE_FLUSH_EVICT,
2756 * Flush space by above mentioned methods and by:
2757 * - Running delayed iputs
2758 * - Committing transaction
2760 * Can be interrupted by a fatal signal.
2762 BTRFS_RESERVE_FLUSH_DATA,
2763 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2764 BTRFS_RESERVE_FLUSH_ALL,
2767 * Pretty much the same as FLUSH_ALL, but can also steal space from
2770 * Can be interrupted by a fatal signal.
2772 BTRFS_RESERVE_FLUSH_ALL_STEAL,
2775 enum btrfs_flush_state {
2776 FLUSH_DELAYED_ITEMS_NR = 1,
2777 FLUSH_DELAYED_ITEMS = 2,
2778 FLUSH_DELAYED_REFS_NR = 3,
2779 FLUSH_DELAYED_REFS = 4,
2781 FLUSH_DELALLOC_WAIT = 6,
2783 ALLOC_CHUNK_FORCE = 8,
2784 RUN_DELAYED_IPUTS = 9,
2788 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2789 struct btrfs_block_rsv *rsv,
2790 int nitems, bool use_global_rsv);
2791 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2792 struct btrfs_block_rsv *rsv);
2793 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2795 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2796 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2797 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2798 u64 start, u64 end);
2799 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2800 u64 num_bytes, u64 *actual_bytes);
2801 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2803 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2804 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2805 struct btrfs_fs_info *fs_info);
2806 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2807 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2808 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2811 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2813 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2814 int btrfs_previous_item(struct btrfs_root *root,
2815 struct btrfs_path *path, u64 min_objectid,
2817 int btrfs_previous_extent_item(struct btrfs_root *root,
2818 struct btrfs_path *path, u64 min_objectid);
2819 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2820 struct btrfs_path *path,
2821 const struct btrfs_key *new_key);
2822 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2823 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2824 struct btrfs_key *key, int lowest_level,
2826 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2827 struct btrfs_path *path,
2829 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2832 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2833 struct btrfs_root *root, struct extent_buffer *buf,
2834 struct extent_buffer *parent, int parent_slot,
2835 struct extent_buffer **cow_ret,
2836 enum btrfs_lock_nesting nest);
2837 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2838 struct btrfs_root *root,
2839 struct extent_buffer *buf,
2840 struct extent_buffer **cow_ret, u64 new_root_objectid);
2841 int btrfs_block_can_be_shared(struct btrfs_root *root,
2842 struct extent_buffer *buf);
2843 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2844 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2845 int btrfs_split_item(struct btrfs_trans_handle *trans,
2846 struct btrfs_root *root,
2847 struct btrfs_path *path,
2848 const struct btrfs_key *new_key,
2849 unsigned long split_offset);
2850 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2851 struct btrfs_root *root,
2852 struct btrfs_path *path,
2853 const struct btrfs_key *new_key);
2854 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2855 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2856 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2857 const struct btrfs_key *key, struct btrfs_path *p,
2858 int ins_len, int cow);
2859 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2860 struct btrfs_path *p, u64 time_seq);
2861 int btrfs_search_slot_for_read(struct btrfs_root *root,
2862 const struct btrfs_key *key,
2863 struct btrfs_path *p, int find_higher,
2865 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2866 struct btrfs_root *root, struct extent_buffer *parent,
2867 int start_slot, u64 *last_ret,
2868 struct btrfs_key *progress);
2869 void btrfs_release_path(struct btrfs_path *p);
2870 struct btrfs_path *btrfs_alloc_path(void);
2871 void btrfs_free_path(struct btrfs_path *p);
2873 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2874 struct btrfs_path *path, int slot, int nr);
2875 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2876 struct btrfs_root *root,
2877 struct btrfs_path *path)
2879 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2882 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2883 const struct btrfs_key *cpu_key, u32 *data_size,
2885 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2886 const struct btrfs_key *key, void *data, u32 data_size);
2887 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2888 struct btrfs_root *root,
2889 struct btrfs_path *path,
2890 const struct btrfs_key *cpu_key, u32 *data_size,
2893 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2894 struct btrfs_root *root,
2895 struct btrfs_path *path,
2896 const struct btrfs_key *key,
2899 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2902 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2903 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2905 static inline int btrfs_next_old_item(struct btrfs_root *root,
2906 struct btrfs_path *p, u64 time_seq)
2909 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2910 return btrfs_next_old_leaf(root, p, time_seq);
2915 * Search the tree again to find a leaf with greater keys.
2917 * Returns 0 if it found something or 1 if there are no greater leaves.
2918 * Returns < 0 on error.
2920 static inline int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
2922 return btrfs_next_old_leaf(root, path, 0);
2925 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2927 return btrfs_next_old_item(root, p, 0);
2929 int btrfs_leaf_free_space(struct extent_buffer *leaf);
2930 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
2932 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2933 struct btrfs_root *root,
2934 struct extent_buffer *node,
2935 struct extent_buffer *parent);
2936 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2939 * Do it this way so we only ever do one test_bit in the normal case.
2941 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2942 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2950 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2951 * anything except sleeping. This function is used to check the status of
2953 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
2954 * since setting and checking for SB_RDONLY in the superblock's flags is not
2957 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2959 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
2960 btrfs_fs_closing(fs_info);
2963 static inline void btrfs_set_sb_rdonly(struct super_block *sb)
2965 sb->s_flags |= SB_RDONLY;
2966 set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
2969 static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
2971 sb->s_flags &= ~SB_RDONLY;
2972 clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
2976 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2977 u64 ref_id, u64 dirid, u64 sequence, const char *name,
2979 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2980 u64 ref_id, u64 dirid, u64 *sequence, const char *name,
2982 int btrfs_del_root(struct btrfs_trans_handle *trans,
2983 const struct btrfs_key *key);
2984 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2985 const struct btrfs_key *key,
2986 struct btrfs_root_item *item);
2987 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2988 struct btrfs_root *root,
2989 struct btrfs_key *key,
2990 struct btrfs_root_item *item);
2991 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
2992 struct btrfs_path *path, struct btrfs_root_item *root_item,
2993 struct btrfs_key *root_key);
2994 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
2995 void btrfs_set_root_node(struct btrfs_root_item *item,
2996 struct extent_buffer *node);
2997 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2998 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2999 struct btrfs_root *root);
3002 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3004 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3006 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3009 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3010 const char *name, int name_len);
3011 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3012 int name_len, struct btrfs_inode *dir,
3013 struct btrfs_key *location, u8 type, u64 index);
3014 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3015 struct btrfs_root *root,
3016 struct btrfs_path *path, u64 dir,
3017 const char *name, int name_len,
3019 struct btrfs_dir_item *
3020 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3021 struct btrfs_root *root,
3022 struct btrfs_path *path, u64 dir,
3023 u64 objectid, const char *name, int name_len,
3025 struct btrfs_dir_item *
3026 btrfs_search_dir_index_item(struct btrfs_root *root,
3027 struct btrfs_path *path, u64 dirid,
3028 const char *name, int name_len);
3029 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3030 struct btrfs_root *root,
3031 struct btrfs_path *path,
3032 struct btrfs_dir_item *di);
3033 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3034 struct btrfs_root *root,
3035 struct btrfs_path *path, u64 objectid,
3036 const char *name, u16 name_len,
3037 const void *data, u16 data_len);
3038 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3039 struct btrfs_root *root,
3040 struct btrfs_path *path, u64 dir,
3041 const char *name, u16 name_len,
3043 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3044 struct btrfs_path *path,
3049 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3050 struct btrfs_root *root, u64 offset);
3051 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3052 struct btrfs_root *root, u64 offset);
3053 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3056 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3057 struct btrfs_root *root,
3058 const char *name, int name_len,
3059 u64 inode_objectid, u64 ref_objectid, u64 index);
3060 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3061 struct btrfs_root *root,
3062 const char *name, int name_len,
3063 u64 inode_objectid, u64 ref_objectid, u64 *index);
3064 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3065 struct btrfs_root *root,
3066 struct btrfs_path *path, u64 objectid);
3067 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3068 *root, struct btrfs_path *path,
3069 struct btrfs_key *location, int mod);
3071 struct btrfs_inode_extref *
3072 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3073 struct btrfs_root *root,
3074 struct btrfs_path *path,
3075 const char *name, int name_len,
3076 u64 inode_objectid, u64 ref_objectid, int ins_len,
3079 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
3080 int slot, const char *name,
3082 struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
3083 struct extent_buffer *leaf, int slot, u64 ref_objectid,
3084 const char *name, int name_len);
3086 struct btrfs_dio_private;
3087 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3088 struct btrfs_root *root, u64 bytenr, u64 len);
3089 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3090 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3091 struct btrfs_root *root,
3092 u64 objectid, u64 pos,
3093 u64 disk_offset, u64 disk_num_bytes,
3094 u64 num_bytes, u64 offset, u64 ram_bytes,
3095 u8 compression, u8 encryption, u16 other_encoding);
3096 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3097 struct btrfs_root *root,
3098 struct btrfs_path *path, u64 objectid,
3099 u64 bytenr, int mod);
3100 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3101 struct btrfs_root *root,
3102 struct btrfs_ordered_sum *sums);
3103 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3104 u64 file_start, int contig);
3105 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3106 struct list_head *list, int search_commit);
3107 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3108 const struct btrfs_path *path,
3109 struct btrfs_file_extent_item *fi,
3110 const bool new_inline,
3111 struct extent_map *em);
3112 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3114 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3116 void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3117 u64 btrfs_file_extent_end(const struct btrfs_path *path);
3120 blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3121 int mirror_num, unsigned long bio_flags);
3122 unsigned int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u32 bio_offset,
3123 struct page *page, u64 start, u64 end);
3124 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3125 u64 start, u64 len);
3126 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3127 u64 *orig_start, u64 *orig_block_len,
3128 u64 *ram_bytes, bool strict);
3130 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3131 struct btrfs_inode *inode);
3132 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3133 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3134 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3135 struct btrfs_root *root,
3136 struct btrfs_inode *dir, struct btrfs_inode *inode,
3137 const char *name, int name_len);
3138 int btrfs_add_link(struct btrfs_trans_handle *trans,
3139 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3140 const char *name, int name_len, int add_backref, u64 index);
3141 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3142 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3144 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3145 struct btrfs_root *root,
3146 struct btrfs_inode *inode, u64 new_size,
3147 u32 min_type, u64 *extents_found);
3149 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3150 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3151 bool in_reclaim_context);
3152 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3153 unsigned int extra_bits,
3154 struct extent_state **cached_state);
3155 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3156 struct btrfs_root *new_root,
3157 struct btrfs_root *parent_root);
3158 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3160 void btrfs_clear_delalloc_extent(struct inode *inode,
3161 struct extent_state *state, unsigned *bits);
3162 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3163 struct extent_state *other);
3164 void btrfs_split_delalloc_extent(struct inode *inode,
3165 struct extent_state *orig, u64 split);
3166 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
3167 unsigned long bio_flags);
3168 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3169 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3170 int btrfs_readpage(struct file *file, struct page *page);
3171 void btrfs_evict_inode(struct inode *inode);
3172 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3173 struct inode *btrfs_alloc_inode(struct super_block *sb);
3174 void btrfs_destroy_inode(struct inode *inode);
3175 void btrfs_free_inode(struct inode *inode);
3176 int btrfs_drop_inode(struct inode *inode);
3177 int __init btrfs_init_cachep(void);
3178 void __cold btrfs_destroy_cachep(void);
3179 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3180 struct btrfs_root *root, struct btrfs_path *path);
3181 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3182 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3183 struct page *page, size_t pg_offset,
3184 u64 start, u64 end);
3185 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3186 struct btrfs_root *root, struct btrfs_inode *inode);
3187 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3188 struct btrfs_root *root, struct btrfs_inode *inode);
3189 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3190 struct btrfs_inode *inode);
3191 int btrfs_orphan_cleanup(struct btrfs_root *root);
3192 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3193 void btrfs_add_delayed_iput(struct inode *inode);
3194 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3195 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3196 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3197 u64 start, u64 num_bytes, u64 min_size,
3198 loff_t actual_len, u64 *alloc_hint);
3199 int btrfs_prealloc_file_range_trans(struct inode *inode,
3200 struct btrfs_trans_handle *trans, int mode,
3201 u64 start, u64 num_bytes, u64 min_size,
3202 loff_t actual_len, u64 *alloc_hint);
3203 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3204 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3205 struct writeback_control *wbc);
3206 int btrfs_writepage_cow_fixup(struct page *page);
3207 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3208 struct page *page, u64 start,
3209 u64 end, bool uptodate);
3210 extern const struct dentry_operations btrfs_dentry_operations;
3211 extern const struct iomap_ops btrfs_dio_iomap_ops;
3212 extern const struct iomap_dio_ops btrfs_dio_ops;
3214 /* Inode locking type flags, by default the exclusive lock is taken */
3215 #define BTRFS_ILOCK_SHARED (1U << 0)
3216 #define BTRFS_ILOCK_TRY (1U << 1)
3217 #define BTRFS_ILOCK_MMAP (1U << 2)
3219 int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3220 void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3221 void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3222 const u64 add_bytes,
3223 const u64 del_bytes);
3226 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3227 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3228 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3229 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3230 struct dentry *dentry, struct fileattr *fa);
3231 int btrfs_ioctl_get_supported_features(void __user *arg);
3232 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3233 int __pure btrfs_is_empty_uuid(u8 *uuid);
3234 int btrfs_defrag_file(struct inode *inode, struct file *file,
3235 struct btrfs_ioctl_defrag_range_args *range,
3236 u64 newer_than, unsigned long max_pages);
3237 void btrfs_get_block_group_info(struct list_head *groups_list,
3238 struct btrfs_ioctl_space_info *space);
3239 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3240 struct btrfs_ioctl_balance_args *bargs);
3241 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3242 enum btrfs_exclusive_operation type);
3243 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3244 enum btrfs_exclusive_operation type);
3245 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3246 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3249 int __init btrfs_auto_defrag_init(void);
3250 void __cold btrfs_auto_defrag_exit(void);
3251 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3252 struct btrfs_inode *inode);
3253 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3254 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3255 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3256 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3258 extern const struct file_operations btrfs_file_operations;
3259 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3260 struct btrfs_root *root, struct btrfs_inode *inode,
3261 struct btrfs_drop_extents_args *args);
3262 int btrfs_replace_file_extents(struct btrfs_inode *inode,
3263 struct btrfs_path *path, const u64 start,
3265 struct btrfs_replace_extent_info *extent_info,
3266 struct btrfs_trans_handle **trans_out);
3267 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3268 struct btrfs_inode *inode, u64 start, u64 end);
3269 int btrfs_release_file(struct inode *inode, struct file *file);
3270 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3271 size_t num_pages, loff_t pos, size_t write_bytes,
3272 struct extent_state **cached, bool noreserve);
3273 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3274 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3275 size_t *write_bytes);
3276 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3279 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3280 struct btrfs_root *root);
3283 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3284 unsigned long new_flags);
3285 int btrfs_sync_fs(struct super_block *sb, int wait);
3286 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3287 u64 subvol_objectid);
3289 static inline __printf(2, 3) __cold
3290 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3294 #ifdef CONFIG_PRINTK
3297 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3299 #define btrfs_printk(fs_info, fmt, args...) \
3300 btrfs_no_printk(fs_info, fmt, ##args)
3303 #define btrfs_emerg(fs_info, fmt, args...) \
3304 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3305 #define btrfs_alert(fs_info, fmt, args...) \
3306 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3307 #define btrfs_crit(fs_info, fmt, args...) \
3308 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3309 #define btrfs_err(fs_info, fmt, args...) \
3310 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3311 #define btrfs_warn(fs_info, fmt, args...) \
3312 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3313 #define btrfs_notice(fs_info, fmt, args...) \
3314 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3315 #define btrfs_info(fs_info, fmt, args...) \
3316 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3319 * Wrappers that use printk_in_rcu
3321 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3322 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3323 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3324 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3325 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3326 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3327 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3328 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3329 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3330 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3331 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3332 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3333 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3334 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3337 * Wrappers that use a ratelimited printk_in_rcu
3339 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3340 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3341 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3342 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3343 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3344 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3345 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3346 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3347 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3348 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3349 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3350 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3351 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3352 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3355 * Wrappers that use a ratelimited printk
3357 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3358 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3359 #define btrfs_alert_rl(fs_info, fmt, args...) \
3360 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3361 #define btrfs_crit_rl(fs_info, fmt, args...) \
3362 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3363 #define btrfs_err_rl(fs_info, fmt, args...) \
3364 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3365 #define btrfs_warn_rl(fs_info, fmt, args...) \
3366 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3367 #define btrfs_notice_rl(fs_info, fmt, args...) \
3368 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3369 #define btrfs_info_rl(fs_info, fmt, args...) \
3370 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3372 #if defined(CONFIG_DYNAMIC_DEBUG)
3373 #define btrfs_debug(fs_info, fmt, args...) \
3374 _dynamic_func_call_no_desc(fmt, btrfs_printk, \
3375 fs_info, KERN_DEBUG fmt, ##args)
3376 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3377 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \
3378 fs_info, KERN_DEBUG fmt, ##args)
3379 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3380 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \
3381 fs_info, KERN_DEBUG fmt, ##args)
3382 #define btrfs_debug_rl(fs_info, fmt, args...) \
3383 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \
3384 fs_info, KERN_DEBUG fmt, ##args)
3385 #elif defined(DEBUG)
3386 #define btrfs_debug(fs_info, fmt, args...) \
3387 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3388 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3389 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3390 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3391 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3392 #define btrfs_debug_rl(fs_info, fmt, args...) \
3393 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3395 #define btrfs_debug(fs_info, fmt, args...) \
3396 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3397 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3398 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3399 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3400 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3401 #define btrfs_debug_rl(fs_info, fmt, args...) \
3402 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3405 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3408 btrfs_printk(fs_info, fmt, ##args); \
3409 rcu_read_unlock(); \
3412 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \
3415 btrfs_no_printk(fs_info, fmt, ##args); \
3416 rcu_read_unlock(); \
3419 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3421 static DEFINE_RATELIMIT_STATE(_rs, \
3422 DEFAULT_RATELIMIT_INTERVAL, \
3423 DEFAULT_RATELIMIT_BURST); \
3424 if (__ratelimit(&_rs)) \
3425 btrfs_printk(fs_info, fmt, ##args); \
3428 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3431 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3432 rcu_read_unlock(); \
3435 #ifdef CONFIG_BTRFS_ASSERT
3437 static inline void assertfail(const char *expr, const char *file, int line)
3439 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3443 #define ASSERT(expr) \
3444 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3447 static inline void assertfail(const char *expr, const char* file, int line) { }
3448 #define ASSERT(expr) (void)(expr)
3451 #if BITS_PER_LONG == 32
3452 #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3454 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3455 * addresses of extents.
3457 * For 4K page size it's about 10T, for 64K it's 160T.
3459 #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3460 void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3461 void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3465 * Get the correct offset inside the page of extent buffer.
3467 * @eb: target extent buffer
3468 * @start: offset inside the extent buffer
3470 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3472 static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3473 unsigned long offset)
3476 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3477 * to PAGE_SIZE, thus adding it won't cause any difference.
3479 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3480 * to the eb, thus we have to take the eb->start into consideration.
3482 return offset_in_page(offset + eb->start);
3485 static inline unsigned long get_eb_page_index(unsigned long offset)
3488 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3490 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3491 * and have ensured that all tree blocks are contained in one page,
3492 * thus we always get index == 0.
3494 return offset >> PAGE_SHIFT;
3498 * Use that for functions that are conditionally exported for sanity tests but
3501 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3502 #define EXPORT_FOR_TESTS static
3504 #define EXPORT_FOR_TESTS
3508 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3511 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3516 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3517 unsigned int line, int errno, const char *fmt, ...);
3519 const char * __attribute_const__ btrfs_decode_error(int errno);
3522 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3523 const char *function,
3524 unsigned int line, int errno);
3527 * Call btrfs_abort_transaction as early as possible when an error condition is
3528 * detected, that way the exact line number is reported.
3530 #define btrfs_abort_transaction(trans, errno) \
3532 /* Report first abort since mount */ \
3533 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3534 &((trans)->fs_info->fs_state))) { \
3535 if ((errno) != -EIO && (errno) != -EROFS) { \
3536 WARN(1, KERN_DEBUG \
3537 "BTRFS: Transaction aborted (error %d)\n", \
3540 btrfs_debug((trans)->fs_info, \
3541 "Transaction aborted (error %d)", \
3545 __btrfs_abort_transaction((trans), __func__, \
3546 __LINE__, (errno)); \
3549 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3551 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3552 (errno), fmt, ##args); \
3557 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3558 unsigned int line, int errno, const char *fmt, ...);
3560 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3561 * will panic(). Otherwise we BUG() here.
3563 #define btrfs_panic(fs_info, errno, fmt, args...) \
3565 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3570 /* compatibility and incompatibility defines */
3572 #define btrfs_set_fs_incompat(__fs_info, opt) \
3573 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3576 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3577 u64 flag, const char* name)
3579 struct btrfs_super_block *disk_super;
3582 disk_super = fs_info->super_copy;
3583 features = btrfs_super_incompat_flags(disk_super);
3584 if (!(features & flag)) {
3585 spin_lock(&fs_info->super_lock);
3586 features = btrfs_super_incompat_flags(disk_super);
3587 if (!(features & flag)) {
3589 btrfs_set_super_incompat_flags(disk_super, features);
3591 "setting incompat feature flag for %s (0x%llx)",
3594 spin_unlock(&fs_info->super_lock);
3598 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3599 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3602 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3603 u64 flag, const char* name)
3605 struct btrfs_super_block *disk_super;
3608 disk_super = fs_info->super_copy;
3609 features = btrfs_super_incompat_flags(disk_super);
3610 if (features & flag) {
3611 spin_lock(&fs_info->super_lock);
3612 features = btrfs_super_incompat_flags(disk_super);
3613 if (features & flag) {
3615 btrfs_set_super_incompat_flags(disk_super, features);
3617 "clearing incompat feature flag for %s (0x%llx)",
3620 spin_unlock(&fs_info->super_lock);
3624 #define btrfs_fs_incompat(fs_info, opt) \
3625 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3627 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3629 struct btrfs_super_block *disk_super;
3630 disk_super = fs_info->super_copy;
3631 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3634 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3635 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3638 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3639 u64 flag, const char *name)
3641 struct btrfs_super_block *disk_super;
3644 disk_super = fs_info->super_copy;
3645 features = btrfs_super_compat_ro_flags(disk_super);
3646 if (!(features & flag)) {
3647 spin_lock(&fs_info->super_lock);
3648 features = btrfs_super_compat_ro_flags(disk_super);
3649 if (!(features & flag)) {
3651 btrfs_set_super_compat_ro_flags(disk_super, features);
3653 "setting compat-ro feature flag for %s (0x%llx)",
3656 spin_unlock(&fs_info->super_lock);
3660 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3661 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3664 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3665 u64 flag, const char *name)
3667 struct btrfs_super_block *disk_super;
3670 disk_super = fs_info->super_copy;
3671 features = btrfs_super_compat_ro_flags(disk_super);
3672 if (features & flag) {
3673 spin_lock(&fs_info->super_lock);
3674 features = btrfs_super_compat_ro_flags(disk_super);
3675 if (features & flag) {
3677 btrfs_set_super_compat_ro_flags(disk_super, features);
3679 "clearing compat-ro feature flag for %s (0x%llx)",
3682 spin_unlock(&fs_info->super_lock);
3686 #define btrfs_fs_compat_ro(fs_info, opt) \
3687 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3689 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3691 struct btrfs_super_block *disk_super;
3692 disk_super = fs_info->super_copy;
3693 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3697 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3698 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3699 int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3700 struct posix_acl *acl, int type);
3701 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3702 struct inode *inode, struct inode *dir);
3704 #define btrfs_get_acl NULL
3705 #define btrfs_set_acl NULL
3706 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3707 struct inode *inode, struct inode *dir)
3714 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3715 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3716 struct btrfs_root *root);
3717 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3718 struct btrfs_root *root);
3719 int btrfs_recover_relocation(struct btrfs_root *root);
3720 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3721 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3722 struct btrfs_root *root, struct extent_buffer *buf,
3723 struct extent_buffer *cow);
3724 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3725 u64 *bytes_to_reserve);
3726 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3727 struct btrfs_pending_snapshot *pending);
3728 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3729 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3731 int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3734 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3735 u64 end, struct btrfs_scrub_progress *progress,
3736 int readonly, int is_dev_replace);
3737 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3738 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3739 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3740 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3741 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3742 struct btrfs_scrub_progress *progress);
3743 static inline void btrfs_init_full_stripe_locks_tree(
3744 struct btrfs_full_stripe_locks_tree *locks_root)
3746 locks_root->root = RB_ROOT;
3747 mutex_init(&locks_root->lock);
3751 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3752 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3753 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3755 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3757 btrfs_bio_counter_sub(fs_info, 1);
3761 struct reada_control {
3762 struct btrfs_fs_info *fs_info; /* tree to prefetch */
3763 struct btrfs_key key_start;
3764 struct btrfs_key key_end; /* exclusive */
3767 wait_queue_head_t wait;
3769 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3770 struct btrfs_key *start, struct btrfs_key *end);
3771 int btrfs_reada_wait(void *handle);
3772 void btrfs_reada_detach(void *handle);
3773 int btree_readahead_hook(struct extent_buffer *eb, int err);
3774 void btrfs_reada_remove_dev(struct btrfs_device *dev);
3775 void btrfs_reada_undo_remove_dev(struct btrfs_device *dev);
3777 static inline int is_fstree(u64 rootid)
3779 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3780 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3781 !btrfs_qgroup_level(rootid)))
3786 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3788 return signal_pending(current);
3791 /* Sanity test specific functions */
3792 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3793 void btrfs_test_destroy_inode(struct inode *inode);
3794 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3796 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3799 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3805 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
3807 return fs_info->zoned != 0;
3811 * We use page status Private2 to indicate there is an ordered extent with
3814 * Rename the Private2 accessors to Ordered, to improve readability.
3816 #define PageOrdered(page) PagePrivate2(page)
3817 #define SetPageOrdered(page) SetPagePrivate2(page)
3818 #define ClearPageOrdered(page) ClearPagePrivate2(page)