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 /* Max size to emit ZONE_APPEND write command */
1016 u64 max_zone_append_size;
1017 struct mutex zoned_meta_io_lock;
1018 spinlock_t treelog_bg_lock;
1021 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1022 spinlock_t ref_verify_lock;
1023 struct rb_root block_tree;
1026 #ifdef CONFIG_BTRFS_DEBUG
1027 struct kobject *debug_kobj;
1028 struct kobject *discard_debug_kobj;
1029 struct list_head allocated_roots;
1031 spinlock_t eb_leak_lock;
1032 struct list_head allocated_ebs;
1036 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1038 return sb->s_fs_info;
1042 * The state of btrfs root
1046 * btrfs_record_root_in_trans is a multi-step process, and it can race
1047 * with the balancing code. But the race is very small, and only the
1048 * first time the root is added to each transaction. So IN_TRANS_SETUP
1049 * is used to tell us when more checks are required
1051 BTRFS_ROOT_IN_TRANS_SETUP,
1054 * Set if tree blocks of this root can be shared by other roots.
1055 * Only subvolume trees and their reloc trees have this bit set.
1056 * Conflicts with TRACK_DIRTY bit.
1058 * This affects two things:
1060 * - How balance works
1061 * For shareable roots, we need to use reloc tree and do path
1062 * replacement for balance, and need various pre/post hooks for
1063 * snapshot creation to handle them.
1065 * While for non-shareable trees, we just simply do a tree search
1068 * - How dirty roots are tracked
1069 * For shareable roots, btrfs_record_root_in_trans() is needed to
1070 * track them, while non-subvolume roots have TRACK_DIRTY bit, they
1071 * don't need to set this manually.
1073 BTRFS_ROOT_SHAREABLE,
1074 BTRFS_ROOT_TRACK_DIRTY,
1075 BTRFS_ROOT_IN_RADIX,
1076 BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1077 BTRFS_ROOT_DEFRAG_RUNNING,
1078 BTRFS_ROOT_FORCE_COW,
1079 BTRFS_ROOT_MULTI_LOG_TASKS,
1081 BTRFS_ROOT_DELETING,
1084 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1086 * Set for the subvolume tree owning the reloc tree.
1088 BTRFS_ROOT_DEAD_RELOC_TREE,
1089 /* Mark dead root stored on device whose cleanup needs to be resumed */
1090 BTRFS_ROOT_DEAD_TREE,
1091 /* The root has a log tree. Used for subvolume roots and the tree root. */
1092 BTRFS_ROOT_HAS_LOG_TREE,
1093 /* Qgroup flushing is in progress */
1094 BTRFS_ROOT_QGROUP_FLUSHING,
1098 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1099 * code. For detail check comment in fs/btrfs/qgroup.c.
1101 struct btrfs_qgroup_swapped_blocks {
1103 /* RM_EMPTY_ROOT() of above blocks[] */
1105 struct rb_root blocks[BTRFS_MAX_LEVEL];
1109 * in ram representation of the tree. extent_root is used for all allocations
1110 * and for the extent tree extent_root root.
1113 struct extent_buffer *node;
1115 struct extent_buffer *commit_root;
1116 struct btrfs_root *log_root;
1117 struct btrfs_root *reloc_root;
1119 unsigned long state;
1120 struct btrfs_root_item root_item;
1121 struct btrfs_key root_key;
1122 struct btrfs_fs_info *fs_info;
1123 struct extent_io_tree dirty_log_pages;
1125 struct mutex objectid_mutex;
1127 spinlock_t accounting_lock;
1128 struct btrfs_block_rsv *block_rsv;
1130 struct mutex log_mutex;
1131 wait_queue_head_t log_writer_wait;
1132 wait_queue_head_t log_commit_wait[2];
1133 struct list_head log_ctxs[2];
1134 /* Used only for log trees of subvolumes, not for the log root tree */
1135 atomic_t log_writers;
1136 atomic_t log_commit[2];
1137 /* Used only for log trees of subvolumes, not for the log root tree */
1140 /* No matter the commit succeeds or not*/
1141 int log_transid_committed;
1142 /* Just be updated when the commit succeeds. */
1143 int last_log_commit;
1144 pid_t log_start_pid;
1152 struct btrfs_key defrag_progress;
1153 struct btrfs_key defrag_max;
1155 /* The dirty list is only used by non-shareable roots */
1156 struct list_head dirty_list;
1158 struct list_head root_list;
1160 spinlock_t log_extents_lock[2];
1161 struct list_head logged_list[2];
1163 int orphan_cleanup_state;
1165 spinlock_t inode_lock;
1166 /* red-black tree that keeps track of in-memory inodes */
1167 struct rb_root inode_tree;
1170 * radix tree that keeps track of delayed nodes of every inode,
1171 * protected by inode_lock
1173 struct radix_tree_root delayed_nodes_tree;
1175 * right now this just gets used so that a root has its own devid
1176 * for stat. It may be used for more later
1180 spinlock_t root_item_lock;
1183 struct mutex delalloc_mutex;
1184 spinlock_t delalloc_lock;
1186 * all of the inodes that have delalloc bytes. It is possible for
1187 * this list to be empty even when there is still dirty data=ordered
1188 * extents waiting to finish IO.
1190 struct list_head delalloc_inodes;
1191 struct list_head delalloc_root;
1192 u64 nr_delalloc_inodes;
1194 struct mutex ordered_extent_mutex;
1196 * this is used by the balancing code to wait for all the pending
1199 spinlock_t ordered_extent_lock;
1202 * all of the data=ordered extents pending writeback
1203 * these can span multiple transactions and basically include
1204 * every dirty data page that isn't from nodatacow
1206 struct list_head ordered_extents;
1207 struct list_head ordered_root;
1208 u64 nr_ordered_extents;
1211 * Not empty if this subvolume root has gone through tree block swap
1214 * Will be used by reloc_control::dirty_subvol_roots.
1216 struct list_head reloc_dirty_list;
1219 * Number of currently running SEND ioctls to prevent
1220 * manipulation with the read-only status via SUBVOL_SETFLAGS
1222 int send_in_progress;
1224 * Number of currently running deduplication operations that have a
1225 * destination inode belonging to this root. Protected by the lock
1228 int dedupe_in_progress;
1229 /* For exclusion of snapshot creation and nocow writes */
1230 struct btrfs_drew_lock snapshot_lock;
1232 atomic_t snapshot_force_cow;
1234 /* For qgroup metadata reserved space */
1235 spinlock_t qgroup_meta_rsv_lock;
1236 u64 qgroup_meta_rsv_pertrans;
1237 u64 qgroup_meta_rsv_prealloc;
1238 wait_queue_head_t qgroup_flush_wait;
1240 /* Number of active swapfiles */
1241 atomic_t nr_swapfiles;
1243 /* Record pairs of swapped blocks for qgroup */
1244 struct btrfs_qgroup_swapped_blocks swapped_blocks;
1246 /* Used only by log trees, when logging csum items */
1247 struct extent_io_tree log_csum_range;
1249 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1253 #ifdef CONFIG_BTRFS_DEBUG
1254 struct list_head leak_list;
1259 * Structure that conveys information about an extent that is going to replace
1260 * all the extents in a file range.
1262 struct btrfs_replace_extent_info {
1268 /* Pointer to a file extent item of type regular or prealloc. */
1271 * Set to true when attempting to replace a file range with a new extent
1272 * described by this structure, set to false when attempting to clone an
1273 * existing extent into a file range.
1276 /* Meaningful only if is_new_extent is true. */
1277 int qgroup_reserved;
1279 * Meaningful only if is_new_extent is true.
1280 * Used to track how many extent items we have already inserted in a
1281 * subvolume tree that refer to the extent described by this structure,
1282 * so that we know when to create a new delayed ref or update an existing
1288 /* Arguments for btrfs_drop_extents() */
1289 struct btrfs_drop_extents_args {
1290 /* Input parameters */
1293 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1294 * If 'replace_extent' is true, this must not be NULL. Also the path
1295 * is always released except if 'replace_extent' is true and
1296 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1297 * the path is kept locked.
1299 struct btrfs_path *path;
1300 /* Start offset of the range to drop extents from */
1302 /* End (exclusive, last byte + 1) of the range to drop extents from */
1304 /* If true drop all the extent maps in the range */
1307 * If true it means we want to insert a new extent after dropping all
1308 * the extents in the range. If this is true, the 'extent_item_size'
1309 * parameter must be set as well and the 'extent_inserted' field will
1310 * be set to true by btrfs_drop_extents() if it could insert the new
1312 * Note: when this is set to true the path must not be NULL.
1314 bool replace_extent;
1316 * Used if 'replace_extent' is true. Size of the file extent item to
1317 * insert after dropping all existing extents in the range
1319 u32 extent_item_size;
1321 /* Output parameters */
1324 * Set to the minimum between the input parameter 'end' and the end
1325 * (exclusive, last byte + 1) of the last dropped extent. This is always
1326 * set even if btrfs_drop_extents() returns an error.
1330 * The number of allocated bytes found in the range. This can be smaller
1331 * than the range's length when there are holes in the range.
1335 * Only set if 'replace_extent' is true. Set to true if we were able
1336 * to insert a replacement extent after dropping all extents in the
1337 * range, otherwise set to false by btrfs_drop_extents().
1338 * Also, if btrfs_drop_extents() has set this to true it means it
1339 * returned with the path locked, otherwise if it has set this to
1340 * false it has returned with the path released.
1342 bool extent_inserted;
1345 struct btrfs_file_private {
1350 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1353 return info->nodesize - sizeof(struct btrfs_header);
1356 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items)
1358 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1360 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1363 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1365 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1368 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1369 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1370 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1372 return BTRFS_MAX_ITEM_SIZE(info) -
1373 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1376 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1378 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1382 * Flags for mount options.
1384 * Note: don't forget to add new options to btrfs_show_options()
1387 BTRFS_MOUNT_NODATASUM = (1UL << 0),
1388 BTRFS_MOUNT_NODATACOW = (1UL << 1),
1389 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
1390 BTRFS_MOUNT_SSD = (1UL << 3),
1391 BTRFS_MOUNT_DEGRADED = (1UL << 4),
1392 BTRFS_MOUNT_COMPRESS = (1UL << 5),
1393 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
1394 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
1395 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
1396 BTRFS_MOUNT_NOSSD = (1UL << 9),
1397 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
1398 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
1399 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
1400 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
1401 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
1402 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
1403 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
1404 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
1405 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
1406 BTRFS_MOUNT_CHECK_INTEGRITY = (1UL << 19),
1407 BTRFS_MOUNT_CHECK_INTEGRITY_DATA = (1UL << 20),
1408 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 21),
1409 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 22),
1410 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 23),
1411 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 24),
1412 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 25),
1413 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 26),
1414 BTRFS_MOUNT_REF_VERIFY = (1UL << 27),
1415 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 28),
1416 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 29),
1417 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 30),
1420 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1421 #define BTRFS_DEFAULT_MAX_INLINE (2048)
1423 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1424 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1425 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1426 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1429 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1431 if (!btrfs_test_opt(fs_info, opt)) \
1432 btrfs_info(fs_info, fmt, ##args); \
1433 btrfs_set_opt(fs_info->mount_opt, opt); \
1436 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1438 if (btrfs_test_opt(fs_info, opt)) \
1439 btrfs_info(fs_info, fmt, ##args); \
1440 btrfs_clear_opt(fs_info->mount_opt, opt); \
1444 * Requests for changes that need to be done during transaction commit.
1446 * Internal mount options that are used for special handling of the real
1447 * mount options (eg. cannot be set during remount and have to be set during
1448 * transaction commit)
1451 #define BTRFS_PENDING_COMMIT (0)
1453 #define btrfs_test_pending(info, opt) \
1454 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1455 #define btrfs_set_pending(info, opt) \
1456 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1457 #define btrfs_clear_pending(info, opt) \
1458 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1461 * Helpers for setting pending mount option changes.
1463 * Expects corresponding macros
1464 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1466 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1468 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1469 btrfs_info((info), fmt, ##args); \
1470 btrfs_set_pending((info), SET_##opt); \
1471 btrfs_clear_pending((info), CLEAR_##opt); \
1475 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1477 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1478 btrfs_info((info), fmt, ##args); \
1479 btrfs_set_pending((info), CLEAR_##opt); \
1480 btrfs_clear_pending((info), SET_##opt); \
1487 #define BTRFS_INODE_NODATASUM (1 << 0)
1488 #define BTRFS_INODE_NODATACOW (1 << 1)
1489 #define BTRFS_INODE_READONLY (1 << 2)
1490 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1491 #define BTRFS_INODE_PREALLOC (1 << 4)
1492 #define BTRFS_INODE_SYNC (1 << 5)
1493 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1494 #define BTRFS_INODE_APPEND (1 << 7)
1495 #define BTRFS_INODE_NODUMP (1 << 8)
1496 #define BTRFS_INODE_NOATIME (1 << 9)
1497 #define BTRFS_INODE_DIRSYNC (1 << 10)
1498 #define BTRFS_INODE_COMPRESS (1 << 11)
1500 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
1502 #define BTRFS_INODE_FLAG_MASK \
1503 (BTRFS_INODE_NODATASUM | \
1504 BTRFS_INODE_NODATACOW | \
1505 BTRFS_INODE_READONLY | \
1506 BTRFS_INODE_NOCOMPRESS | \
1507 BTRFS_INODE_PREALLOC | \
1508 BTRFS_INODE_SYNC | \
1509 BTRFS_INODE_IMMUTABLE | \
1510 BTRFS_INODE_APPEND | \
1511 BTRFS_INODE_NODUMP | \
1512 BTRFS_INODE_NOATIME | \
1513 BTRFS_INODE_DIRSYNC | \
1514 BTRFS_INODE_COMPRESS | \
1515 BTRFS_INODE_ROOT_ITEM_INIT)
1517 struct btrfs_map_token {
1518 struct extent_buffer *eb;
1520 unsigned long offset;
1523 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1524 ((bytes) >> (fs_info)->sectorsize_bits)
1526 static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1527 struct extent_buffer *eb)
1530 token->kaddr = page_address(eb->pages[0]);
1534 /* some macros to generate set/get functions for the struct fields. This
1535 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1538 #define le8_to_cpu(v) (v)
1539 #define cpu_to_le8(v) (v)
1542 static inline u8 get_unaligned_le8(const void *p)
1547 static inline void put_unaligned_le8(u8 val, void *p)
1552 #define read_eb_member(eb, ptr, type, member, result) (\
1553 read_extent_buffer(eb, (char *)(result), \
1554 ((unsigned long)(ptr)) + \
1555 offsetof(type, member), \
1556 sizeof(((type *)0)->member)))
1558 #define write_eb_member(eb, ptr, type, member, result) (\
1559 write_extent_buffer(eb, (char *)(result), \
1560 ((unsigned long)(ptr)) + \
1561 offsetof(type, member), \
1562 sizeof(((type *)0)->member)))
1564 #define DECLARE_BTRFS_SETGET_BITS(bits) \
1565 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
1566 const void *ptr, unsigned long off); \
1567 void btrfs_set_token_##bits(struct btrfs_map_token *token, \
1568 const void *ptr, unsigned long off, \
1570 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
1571 const void *ptr, unsigned long off); \
1572 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
1573 unsigned long off, u##bits val);
1575 DECLARE_BTRFS_SETGET_BITS(8)
1576 DECLARE_BTRFS_SETGET_BITS(16)
1577 DECLARE_BTRFS_SETGET_BITS(32)
1578 DECLARE_BTRFS_SETGET_BITS(64)
1580 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1581 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1584 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1585 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1587 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1590 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1591 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1593 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
1596 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1597 return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1599 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1600 type *s, u##bits val) \
1602 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1603 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
1606 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1607 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1609 const type *p = page_address(eb->pages[0]) + \
1610 offset_in_page(eb->start); \
1611 return get_unaligned_le##bits(&p->member); \
1613 static inline void btrfs_set_##name(const struct extent_buffer *eb, \
1616 type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1617 put_unaligned_le##bits(val, &p->member); \
1620 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1621 static inline u##bits btrfs_##name(const type *s) \
1623 return get_unaligned_le##bits(&s->member); \
1625 static inline void btrfs_set_##name(type *s, u##bits val) \
1627 put_unaligned_le##bits(val, &s->member); \
1630 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1631 struct btrfs_dev_item *s)
1633 BUILD_BUG_ON(sizeof(u64) !=
1634 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1635 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1638 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1639 struct btrfs_dev_item *s,
1642 BUILD_BUG_ON(sizeof(u64) !=
1643 sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1644 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1645 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1649 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1650 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1651 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1652 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1653 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1655 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1656 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1657 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1658 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1659 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1660 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1662 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1663 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1665 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1667 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1669 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1671 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1673 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1674 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1676 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1678 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1680 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1683 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1685 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1688 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1690 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1693 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1694 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1695 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1696 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1697 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1698 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1699 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1700 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1701 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1702 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1703 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1705 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1707 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1710 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1711 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1712 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1714 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1716 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1718 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1720 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1721 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1723 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1725 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1726 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1728 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1731 unsigned long offset = (unsigned long)c;
1732 offset += offsetof(struct btrfs_chunk, stripe);
1733 offset += nr * sizeof(struct btrfs_stripe);
1734 return (struct btrfs_stripe *)offset;
1737 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1739 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1742 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1743 struct btrfs_chunk *c, int nr)
1745 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1748 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1749 struct btrfs_chunk *c, int nr)
1751 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1754 /* struct btrfs_block_group_item */
1755 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1757 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1759 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1760 struct btrfs_block_group_item, chunk_objectid, 64);
1762 BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1763 struct btrfs_block_group_item, chunk_objectid, 64);
1764 BTRFS_SETGET_FUNCS(block_group_flags,
1765 struct btrfs_block_group_item, flags, 64);
1766 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1767 struct btrfs_block_group_item, flags, 64);
1769 /* struct btrfs_free_space_info */
1770 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1772 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1774 /* struct btrfs_inode_ref */
1775 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1776 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1778 /* struct btrfs_inode_extref */
1779 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1780 parent_objectid, 64);
1781 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1783 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1785 /* struct btrfs_inode_item */
1786 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1787 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1788 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1789 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1790 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1791 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1792 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1793 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1794 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1795 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1796 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1797 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1798 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1800 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1802 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1804 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1805 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1807 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1809 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1810 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1811 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1812 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1813 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1814 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1815 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1816 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1817 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1818 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1820 /* struct btrfs_dev_extent */
1821 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1823 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1824 chunk_objectid, 64);
1825 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1827 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1828 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1829 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1831 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1833 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1835 static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1836 struct btrfs_tree_block_info *item,
1837 struct btrfs_disk_key *key)
1839 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1842 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1843 struct btrfs_tree_block_info *item,
1844 struct btrfs_disk_key *key)
1846 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1849 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1851 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1853 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1855 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1858 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1861 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1863 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1866 static inline u32 btrfs_extent_inline_ref_size(int type)
1868 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1869 type == BTRFS_SHARED_BLOCK_REF_KEY)
1870 return sizeof(struct btrfs_extent_inline_ref);
1871 if (type == BTRFS_SHARED_DATA_REF_KEY)
1872 return sizeof(struct btrfs_shared_data_ref) +
1873 sizeof(struct btrfs_extent_inline_ref);
1874 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1875 return sizeof(struct btrfs_extent_data_ref) +
1876 offsetof(struct btrfs_extent_inline_ref, offset);
1880 /* struct btrfs_node */
1881 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1882 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1883 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1885 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1888 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1891 ptr = offsetof(struct btrfs_node, ptrs) +
1892 sizeof(struct btrfs_key_ptr) * nr;
1893 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1896 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1900 ptr = offsetof(struct btrfs_node, ptrs) +
1901 sizeof(struct btrfs_key_ptr) * nr;
1902 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1905 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1908 ptr = offsetof(struct btrfs_node, ptrs) +
1909 sizeof(struct btrfs_key_ptr) * nr;
1910 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1913 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1917 ptr = offsetof(struct btrfs_node, ptrs) +
1918 sizeof(struct btrfs_key_ptr) * nr;
1919 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1922 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1924 return offsetof(struct btrfs_node, ptrs) +
1925 sizeof(struct btrfs_key_ptr) * nr;
1928 void btrfs_node_key(const struct extent_buffer *eb,
1929 struct btrfs_disk_key *disk_key, int nr);
1931 static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1932 struct btrfs_disk_key *disk_key, int nr)
1935 ptr = btrfs_node_key_ptr_offset(nr);
1936 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1937 struct btrfs_key_ptr, key, disk_key);
1940 /* struct btrfs_item */
1941 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1942 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1943 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1944 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1946 static inline unsigned long btrfs_item_nr_offset(int nr)
1948 return offsetof(struct btrfs_leaf, items) +
1949 sizeof(struct btrfs_item) * nr;
1952 static inline struct btrfs_item *btrfs_item_nr(int nr)
1954 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1957 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1958 struct btrfs_item *item)
1960 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1963 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1965 return btrfs_item_end(eb, btrfs_item_nr(nr));
1968 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1970 return btrfs_item_offset(eb, btrfs_item_nr(nr));
1973 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1975 return btrfs_item_size(eb, btrfs_item_nr(nr));
1978 static inline void btrfs_item_key(const struct extent_buffer *eb,
1979 struct btrfs_disk_key *disk_key, int nr)
1981 struct btrfs_item *item = btrfs_item_nr(nr);
1982 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1985 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1986 struct btrfs_disk_key *disk_key, int nr)
1988 struct btrfs_item *item = btrfs_item_nr(nr);
1989 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1992 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1995 * struct btrfs_root_ref
1997 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1998 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1999 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2001 /* struct btrfs_dir_item */
2002 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2003 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2004 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2005 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2006 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2007 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2009 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2011 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2014 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2015 const struct btrfs_dir_item *item,
2016 struct btrfs_disk_key *key)
2018 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2021 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2022 struct btrfs_dir_item *item,
2023 const struct btrfs_disk_key *key)
2025 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2028 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2030 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2032 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2035 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2036 const struct btrfs_free_space_header *h,
2037 struct btrfs_disk_key *key)
2039 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2042 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2043 struct btrfs_free_space_header *h,
2044 const struct btrfs_disk_key *key)
2046 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2049 /* struct btrfs_disk_key */
2050 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2052 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2053 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2055 #ifdef __LITTLE_ENDIAN
2058 * Optimized helpers for little-endian architectures where CPU and on-disk
2059 * structures have the same endianness and we can skip conversions.
2062 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2063 const struct btrfs_disk_key *disk_key)
2065 memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2068 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2069 const struct btrfs_key *cpu_key)
2071 memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2074 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2075 struct btrfs_key *cpu_key, int nr)
2077 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2079 btrfs_node_key(eb, disk_key, nr);
2082 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2083 struct btrfs_key *cpu_key, int nr)
2085 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2087 btrfs_item_key(eb, disk_key, nr);
2090 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2091 const struct btrfs_dir_item *item,
2092 struct btrfs_key *cpu_key)
2094 struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2096 btrfs_dir_item_key(eb, item, disk_key);
2101 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2102 const struct btrfs_disk_key *disk)
2104 cpu->offset = le64_to_cpu(disk->offset);
2105 cpu->type = disk->type;
2106 cpu->objectid = le64_to_cpu(disk->objectid);
2109 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2110 const struct btrfs_key *cpu)
2112 disk->offset = cpu_to_le64(cpu->offset);
2113 disk->type = cpu->type;
2114 disk->objectid = cpu_to_le64(cpu->objectid);
2117 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2118 struct btrfs_key *key, int nr)
2120 struct btrfs_disk_key disk_key;
2121 btrfs_node_key(eb, &disk_key, nr);
2122 btrfs_disk_key_to_cpu(key, &disk_key);
2125 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2126 struct btrfs_key *key, int nr)
2128 struct btrfs_disk_key disk_key;
2129 btrfs_item_key(eb, &disk_key, nr);
2130 btrfs_disk_key_to_cpu(key, &disk_key);
2133 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2134 const struct btrfs_dir_item *item,
2135 struct btrfs_key *key)
2137 struct btrfs_disk_key disk_key;
2138 btrfs_dir_item_key(eb, item, &disk_key);
2139 btrfs_disk_key_to_cpu(key, &disk_key);
2144 /* struct btrfs_header */
2145 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2146 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2148 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2149 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2150 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2151 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2152 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2154 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2155 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2157 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2159 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2161 return (btrfs_header_flags(eb) & flag) == flag;
2164 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2166 u64 flags = btrfs_header_flags(eb);
2167 btrfs_set_header_flags(eb, flags | flag);
2170 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2172 u64 flags = btrfs_header_flags(eb);
2173 btrfs_set_header_flags(eb, flags & ~flag);
2176 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2178 u64 flags = btrfs_header_flags(eb);
2179 return flags >> BTRFS_BACKREF_REV_SHIFT;
2182 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2185 u64 flags = btrfs_header_flags(eb);
2186 flags &= ~BTRFS_BACKREF_REV_MASK;
2187 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2188 btrfs_set_header_flags(eb, flags);
2191 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2193 return btrfs_header_level(eb) == 0;
2196 /* struct btrfs_root_item */
2197 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2199 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2200 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2201 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2203 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2205 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2206 BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2207 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2208 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2209 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2210 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2211 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2212 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2213 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2215 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2217 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2219 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2221 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2223 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2226 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2228 /* Byte-swap the constant at compile time, root_item::flags is LE */
2229 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2232 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2234 /* Byte-swap the constant at compile time, root_item::flags is LE */
2235 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2238 /* struct btrfs_root_backup */
2239 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2241 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2243 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2244 tree_root_level, 8);
2246 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2248 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2249 chunk_root_gen, 64);
2250 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2251 chunk_root_level, 8);
2253 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2255 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2256 extent_root_gen, 64);
2257 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2258 extent_root_level, 8);
2260 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2262 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2264 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2267 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2269 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2271 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2274 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2276 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2278 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2279 csum_root_level, 8);
2280 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2282 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2284 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2287 /* struct btrfs_balance_item */
2288 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2290 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2291 const struct btrfs_balance_item *bi,
2292 struct btrfs_disk_balance_args *ba)
2294 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2297 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2298 struct btrfs_balance_item *bi,
2299 const struct btrfs_disk_balance_args *ba)
2301 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2304 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2305 const struct btrfs_balance_item *bi,
2306 struct btrfs_disk_balance_args *ba)
2308 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2311 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2312 struct btrfs_balance_item *bi,
2313 const struct btrfs_disk_balance_args *ba)
2315 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2318 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2319 const struct btrfs_balance_item *bi,
2320 struct btrfs_disk_balance_args *ba)
2322 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2325 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2326 struct btrfs_balance_item *bi,
2327 const struct btrfs_disk_balance_args *ba)
2329 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2333 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2334 const struct btrfs_disk_balance_args *disk)
2336 memset(cpu, 0, sizeof(*cpu));
2338 cpu->profiles = le64_to_cpu(disk->profiles);
2339 cpu->usage = le64_to_cpu(disk->usage);
2340 cpu->devid = le64_to_cpu(disk->devid);
2341 cpu->pstart = le64_to_cpu(disk->pstart);
2342 cpu->pend = le64_to_cpu(disk->pend);
2343 cpu->vstart = le64_to_cpu(disk->vstart);
2344 cpu->vend = le64_to_cpu(disk->vend);
2345 cpu->target = le64_to_cpu(disk->target);
2346 cpu->flags = le64_to_cpu(disk->flags);
2347 cpu->limit = le64_to_cpu(disk->limit);
2348 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2349 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2353 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2354 const struct btrfs_balance_args *cpu)
2356 memset(disk, 0, sizeof(*disk));
2358 disk->profiles = cpu_to_le64(cpu->profiles);
2359 disk->usage = cpu_to_le64(cpu->usage);
2360 disk->devid = cpu_to_le64(cpu->devid);
2361 disk->pstart = cpu_to_le64(cpu->pstart);
2362 disk->pend = cpu_to_le64(cpu->pend);
2363 disk->vstart = cpu_to_le64(cpu->vstart);
2364 disk->vend = cpu_to_le64(cpu->vend);
2365 disk->target = cpu_to_le64(cpu->target);
2366 disk->flags = cpu_to_le64(cpu->flags);
2367 disk->limit = cpu_to_le64(cpu->limit);
2368 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2369 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2372 /* struct btrfs_super_block */
2373 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2374 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2375 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2377 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2378 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2379 struct btrfs_super_block, sys_chunk_array_size, 32);
2380 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2381 struct btrfs_super_block, chunk_root_generation, 64);
2382 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2384 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2386 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2387 chunk_root_level, 8);
2388 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2390 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2391 log_root_transid, 64);
2392 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2394 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2396 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2398 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2400 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2402 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2404 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2405 root_dir_objectid, 64);
2406 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2408 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2410 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2411 compat_ro_flags, 64);
2412 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2413 incompat_flags, 64);
2414 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2416 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2417 cache_generation, 64);
2418 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2419 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2420 uuid_tree_generation, 64);
2422 int btrfs_super_csum_size(const struct btrfs_super_block *s);
2423 const char *btrfs_super_csum_name(u16 csum_type);
2424 const char *btrfs_super_csum_driver(u16 csum_type);
2425 size_t __attribute_const__ btrfs_get_num_csums(void);
2429 * The leaf data grows from end-to-front in the node.
2430 * this returns the address of the start of the last item,
2431 * which is the stop of the leaf data stack
2433 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2435 u32 nr = btrfs_header_nritems(leaf);
2438 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2439 return btrfs_item_offset_nr(leaf, nr - 1);
2442 /* struct btrfs_file_extent_item */
2443 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2445 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2446 struct btrfs_file_extent_item, disk_bytenr, 64);
2447 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2448 struct btrfs_file_extent_item, offset, 64);
2449 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2450 struct btrfs_file_extent_item, generation, 64);
2451 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2452 struct btrfs_file_extent_item, num_bytes, 64);
2453 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2454 struct btrfs_file_extent_item, ram_bytes, 64);
2455 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2456 struct btrfs_file_extent_item, disk_num_bytes, 64);
2457 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2458 struct btrfs_file_extent_item, compression, 8);
2460 static inline unsigned long
2461 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2463 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2466 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2468 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2471 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2472 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2474 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2476 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2477 disk_num_bytes, 64);
2478 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2480 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2482 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2484 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2486 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2488 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2489 other_encoding, 16);
2492 * this returns the number of bytes used by the item on disk, minus the
2493 * size of any extent headers. If a file is compressed on disk, this is
2494 * the compressed size
2496 static inline u32 btrfs_file_extent_inline_item_len(
2497 const struct extent_buffer *eb,
2498 struct btrfs_item *e)
2500 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2503 /* btrfs_qgroup_status_item */
2504 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2506 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2508 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2510 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2513 /* btrfs_qgroup_info_item */
2514 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2516 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2517 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2519 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2520 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2523 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2524 struct btrfs_qgroup_info_item, generation, 64);
2525 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2527 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2528 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2529 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2531 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2532 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2534 /* btrfs_qgroup_limit_item */
2535 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2537 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2539 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2541 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2543 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2546 /* btrfs_dev_replace_item */
2547 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2548 struct btrfs_dev_replace_item, src_devid, 64);
2549 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2550 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2552 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2554 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2556 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2558 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2559 num_write_errors, 64);
2560 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2561 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2563 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2565 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2568 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2569 struct btrfs_dev_replace_item, src_devid, 64);
2570 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2571 struct btrfs_dev_replace_item,
2572 cont_reading_from_srcdev_mode, 64);
2573 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2574 struct btrfs_dev_replace_item, replace_state, 64);
2575 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2576 struct btrfs_dev_replace_item, time_started, 64);
2577 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2578 struct btrfs_dev_replace_item, time_stopped, 64);
2579 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2580 struct btrfs_dev_replace_item, num_write_errors, 64);
2581 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2582 struct btrfs_dev_replace_item,
2583 num_uncorrectable_read_errors, 64);
2584 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2585 struct btrfs_dev_replace_item, cursor_left, 64);
2586 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2587 struct btrfs_dev_replace_item, cursor_right, 64);
2589 /* helper function to cast into the data area of the leaf. */
2590 #define btrfs_item_ptr(leaf, slot, type) \
2591 ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2592 btrfs_item_offset_nr(leaf, slot)))
2594 #define btrfs_item_ptr_offset(leaf, slot) \
2595 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2596 btrfs_item_offset_nr(leaf, slot)))
2598 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2600 return crc32c(crc, address, length);
2603 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2605 put_unaligned_le32(~crc, result);
2608 static inline u64 btrfs_name_hash(const char *name, int len)
2610 return crc32c((u32)~1, name, len);
2614 * Figure the key offset of an extended inode ref
2616 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2619 return (u64) crc32c(parent_objectid, name, len);
2622 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2624 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2629 enum btrfs_inline_ref_type {
2630 BTRFS_REF_TYPE_INVALID,
2631 BTRFS_REF_TYPE_BLOCK,
2632 BTRFS_REF_TYPE_DATA,
2636 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2637 struct btrfs_extent_inline_ref *iref,
2638 enum btrfs_inline_ref_type is_data);
2639 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2642 * Take the number of bytes to be checksummmed and figure out how many leaves
2643 * it would require to store the csums for that many bytes.
2645 static inline u64 btrfs_csum_bytes_to_leaves(
2646 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2648 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2650 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2654 * Use this if we would be adding new items, as we could split nodes as we cow
2657 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2660 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2664 * Doing a truncate or a modification won't result in new nodes or leaves, just
2665 * what we need for COW.
2667 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2670 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2673 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2674 u64 start, u64 num_bytes);
2675 void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2676 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2677 unsigned long count);
2678 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2679 struct btrfs_delayed_ref_root *delayed_refs,
2680 struct btrfs_delayed_ref_head *head);
2681 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2682 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2683 struct btrfs_fs_info *fs_info, u64 bytenr,
2684 u64 offset, int metadata, u64 *refs, u64 *flags);
2685 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2687 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2688 u64 bytenr, u64 num_bytes);
2689 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2690 int btrfs_cross_ref_exist(struct btrfs_root *root,
2691 u64 objectid, u64 offset, u64 bytenr, bool strict);
2692 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2693 struct btrfs_root *root,
2694 u64 parent, u64 root_objectid,
2695 const struct btrfs_disk_key *key,
2696 int level, u64 hint,
2698 enum btrfs_lock_nesting nest);
2699 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2700 struct btrfs_root *root,
2701 struct extent_buffer *buf,
2702 u64 parent, int last_ref);
2703 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2704 struct btrfs_root *root, u64 owner,
2705 u64 offset, u64 ram_bytes,
2706 struct btrfs_key *ins);
2707 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2708 u64 root_objectid, u64 owner, u64 offset,
2709 struct btrfs_key *ins);
2710 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2711 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2712 struct btrfs_key *ins, int is_data, int delalloc);
2713 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2714 struct extent_buffer *buf, int full_backref);
2715 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2716 struct extent_buffer *buf, int full_backref);
2717 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2718 struct extent_buffer *eb, u64 flags,
2719 int level, int is_data);
2720 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2722 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2723 u64 start, u64 len, int delalloc);
2724 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2726 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2727 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2728 struct btrfs_ref *generic_ref);
2730 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2733 * Different levels for to flush space when doing space reservations.
2735 * The higher the level, the more methods we try to reclaim space.
2737 enum btrfs_reserve_flush_enum {
2738 /* If we are in the transaction, we can't flush anything.*/
2739 BTRFS_RESERVE_NO_FLUSH,
2743 * - Running delayed inode items
2744 * - Allocating a new chunk
2746 BTRFS_RESERVE_FLUSH_LIMIT,
2750 * - Running delayed inode items
2751 * - Running delayed refs
2752 * - Running delalloc and waiting for ordered extents
2753 * - Allocating a new chunk
2755 BTRFS_RESERVE_FLUSH_EVICT,
2758 * Flush space by above mentioned methods and by:
2759 * - Running delayed iputs
2760 * - Committing transaction
2762 * Can be interrupted by a fatal signal.
2764 BTRFS_RESERVE_FLUSH_DATA,
2765 BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2766 BTRFS_RESERVE_FLUSH_ALL,
2769 * Pretty much the same as FLUSH_ALL, but can also steal space from
2772 * Can be interrupted by a fatal signal.
2774 BTRFS_RESERVE_FLUSH_ALL_STEAL,
2777 enum btrfs_flush_state {
2778 FLUSH_DELAYED_ITEMS_NR = 1,
2779 FLUSH_DELAYED_ITEMS = 2,
2780 FLUSH_DELAYED_REFS_NR = 3,
2781 FLUSH_DELAYED_REFS = 4,
2783 FLUSH_DELALLOC_WAIT = 6,
2785 ALLOC_CHUNK_FORCE = 8,
2786 RUN_DELAYED_IPUTS = 9,
2790 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2791 struct btrfs_block_rsv *rsv,
2792 int nitems, bool use_global_rsv);
2793 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2794 struct btrfs_block_rsv *rsv);
2795 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2797 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2798 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2799 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2800 u64 start, u64 end);
2801 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2802 u64 num_bytes, u64 *actual_bytes);
2803 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2805 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2806 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2807 struct btrfs_fs_info *fs_info);
2808 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2809 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2810 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2813 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2815 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2816 int btrfs_previous_item(struct btrfs_root *root,
2817 struct btrfs_path *path, u64 min_objectid,
2819 int btrfs_previous_extent_item(struct btrfs_root *root,
2820 struct btrfs_path *path, u64 min_objectid);
2821 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2822 struct btrfs_path *path,
2823 const struct btrfs_key *new_key);
2824 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2825 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2826 struct btrfs_key *key, int lowest_level,
2828 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2829 struct btrfs_path *path,
2831 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2834 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2835 struct btrfs_root *root, struct extent_buffer *buf,
2836 struct extent_buffer *parent, int parent_slot,
2837 struct extent_buffer **cow_ret,
2838 enum btrfs_lock_nesting nest);
2839 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2840 struct btrfs_root *root,
2841 struct extent_buffer *buf,
2842 struct extent_buffer **cow_ret, u64 new_root_objectid);
2843 int btrfs_block_can_be_shared(struct btrfs_root *root,
2844 struct extent_buffer *buf);
2845 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2846 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2847 int btrfs_split_item(struct btrfs_trans_handle *trans,
2848 struct btrfs_root *root,
2849 struct btrfs_path *path,
2850 const struct btrfs_key *new_key,
2851 unsigned long split_offset);
2852 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2853 struct btrfs_root *root,
2854 struct btrfs_path *path,
2855 const struct btrfs_key *new_key);
2856 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2857 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2858 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2859 const struct btrfs_key *key, struct btrfs_path *p,
2860 int ins_len, int cow);
2861 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2862 struct btrfs_path *p, u64 time_seq);
2863 int btrfs_search_slot_for_read(struct btrfs_root *root,
2864 const struct btrfs_key *key,
2865 struct btrfs_path *p, int find_higher,
2867 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2868 struct btrfs_root *root, struct extent_buffer *parent,
2869 int start_slot, u64 *last_ret,
2870 struct btrfs_key *progress);
2871 void btrfs_release_path(struct btrfs_path *p);
2872 struct btrfs_path *btrfs_alloc_path(void);
2873 void btrfs_free_path(struct btrfs_path *p);
2875 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2876 struct btrfs_path *path, int slot, int nr);
2877 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2878 struct btrfs_root *root,
2879 struct btrfs_path *path)
2881 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2884 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2885 const struct btrfs_key *cpu_key, u32 *data_size,
2887 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2888 const struct btrfs_key *key, void *data, u32 data_size);
2889 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2890 struct btrfs_root *root,
2891 struct btrfs_path *path,
2892 const struct btrfs_key *cpu_key, u32 *data_size,
2895 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2896 struct btrfs_root *root,
2897 struct btrfs_path *path,
2898 const struct btrfs_key *key,
2901 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2904 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2905 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2906 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2908 static inline int btrfs_next_old_item(struct btrfs_root *root,
2909 struct btrfs_path *p, u64 time_seq)
2912 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2913 return btrfs_next_old_leaf(root, p, time_seq);
2916 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2918 return btrfs_next_old_item(root, p, 0);
2920 int btrfs_leaf_free_space(struct extent_buffer *leaf);
2921 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
2923 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2924 struct btrfs_root *root,
2925 struct extent_buffer *node,
2926 struct extent_buffer *parent);
2927 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2930 * Do it this way so we only ever do one test_bit in the normal case.
2932 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2933 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2941 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2942 * anything except sleeping. This function is used to check the status of
2944 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
2945 * since setting and checking for SB_RDONLY in the superblock's flags is not
2948 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2950 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
2951 btrfs_fs_closing(fs_info);
2954 static inline void btrfs_set_sb_rdonly(struct super_block *sb)
2956 sb->s_flags |= SB_RDONLY;
2957 set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
2960 static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
2962 sb->s_flags &= ~SB_RDONLY;
2963 clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
2967 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2968 u64 ref_id, u64 dirid, u64 sequence, const char *name,
2970 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2971 u64 ref_id, u64 dirid, u64 *sequence, const char *name,
2973 int btrfs_del_root(struct btrfs_trans_handle *trans,
2974 const struct btrfs_key *key);
2975 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2976 const struct btrfs_key *key,
2977 struct btrfs_root_item *item);
2978 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2979 struct btrfs_root *root,
2980 struct btrfs_key *key,
2981 struct btrfs_root_item *item);
2982 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
2983 struct btrfs_path *path, struct btrfs_root_item *root_item,
2984 struct btrfs_key *root_key);
2985 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
2986 void btrfs_set_root_node(struct btrfs_root_item *item,
2987 struct extent_buffer *node);
2988 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2989 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2990 struct btrfs_root *root);
2993 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
2995 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
2997 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3000 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3001 const char *name, int name_len);
3002 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3003 int name_len, struct btrfs_inode *dir,
3004 struct btrfs_key *location, u8 type, u64 index);
3005 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3006 struct btrfs_root *root,
3007 struct btrfs_path *path, u64 dir,
3008 const char *name, int name_len,
3010 struct btrfs_dir_item *
3011 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3012 struct btrfs_root *root,
3013 struct btrfs_path *path, u64 dir,
3014 u64 objectid, const char *name, int name_len,
3016 struct btrfs_dir_item *
3017 btrfs_search_dir_index_item(struct btrfs_root *root,
3018 struct btrfs_path *path, u64 dirid,
3019 const char *name, int name_len);
3020 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3021 struct btrfs_root *root,
3022 struct btrfs_path *path,
3023 struct btrfs_dir_item *di);
3024 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3025 struct btrfs_root *root,
3026 struct btrfs_path *path, u64 objectid,
3027 const char *name, u16 name_len,
3028 const void *data, u16 data_len);
3029 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3030 struct btrfs_root *root,
3031 struct btrfs_path *path, u64 dir,
3032 const char *name, u16 name_len,
3034 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3035 struct btrfs_path *path,
3040 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3041 struct btrfs_root *root, u64 offset);
3042 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3043 struct btrfs_root *root, u64 offset);
3044 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3047 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3048 struct btrfs_root *root,
3049 const char *name, int name_len,
3050 u64 inode_objectid, u64 ref_objectid, u64 index);
3051 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3052 struct btrfs_root *root,
3053 const char *name, int name_len,
3054 u64 inode_objectid, u64 ref_objectid, u64 *index);
3055 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3056 struct btrfs_root *root,
3057 struct btrfs_path *path, u64 objectid);
3058 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3059 *root, struct btrfs_path *path,
3060 struct btrfs_key *location, int mod);
3062 struct btrfs_inode_extref *
3063 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3064 struct btrfs_root *root,
3065 struct btrfs_path *path,
3066 const char *name, int name_len,
3067 u64 inode_objectid, u64 ref_objectid, int ins_len,
3070 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
3071 int slot, const char *name,
3073 struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
3074 struct extent_buffer *leaf, int slot, u64 ref_objectid,
3075 const char *name, int name_len);
3077 struct btrfs_dio_private;
3078 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3079 struct btrfs_root *root, u64 bytenr, u64 len);
3080 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3081 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3082 struct btrfs_root *root,
3083 u64 objectid, u64 pos,
3084 u64 disk_offset, u64 disk_num_bytes,
3085 u64 num_bytes, u64 offset, u64 ram_bytes,
3086 u8 compression, u8 encryption, u16 other_encoding);
3087 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3088 struct btrfs_root *root,
3089 struct btrfs_path *path, u64 objectid,
3090 u64 bytenr, int mod);
3091 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3092 struct btrfs_root *root,
3093 struct btrfs_ordered_sum *sums);
3094 blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3095 u64 file_start, int contig);
3096 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3097 struct list_head *list, int search_commit);
3098 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3099 const struct btrfs_path *path,
3100 struct btrfs_file_extent_item *fi,
3101 const bool new_inline,
3102 struct extent_map *em);
3103 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3105 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3107 void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3108 u64 btrfs_file_extent_end(const struct btrfs_path *path);
3111 blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3112 int mirror_num, unsigned long bio_flags);
3113 unsigned int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u32 bio_offset,
3114 struct page *page, u64 start, u64 end);
3115 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3116 u64 start, u64 len);
3117 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3118 u64 *orig_start, u64 *orig_block_len,
3119 u64 *ram_bytes, bool strict);
3121 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3122 struct btrfs_inode *inode);
3123 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3124 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3125 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3126 struct btrfs_root *root,
3127 struct btrfs_inode *dir, struct btrfs_inode *inode,
3128 const char *name, int name_len);
3129 int btrfs_add_link(struct btrfs_trans_handle *trans,
3130 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3131 const char *name, int name_len, int add_backref, u64 index);
3132 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3133 int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3135 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3136 struct btrfs_root *root,
3137 struct btrfs_inode *inode, u64 new_size,
3138 u32 min_type, u64 *extents_found);
3140 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3141 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3142 bool in_reclaim_context);
3143 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3144 unsigned int extra_bits,
3145 struct extent_state **cached_state);
3146 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3147 struct btrfs_root *new_root,
3148 struct btrfs_root *parent_root);
3149 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3151 void btrfs_clear_delalloc_extent(struct inode *inode,
3152 struct extent_state *state, unsigned *bits);
3153 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3154 struct extent_state *other);
3155 void btrfs_split_delalloc_extent(struct inode *inode,
3156 struct extent_state *orig, u64 split);
3157 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
3158 unsigned long bio_flags);
3159 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3160 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3161 int btrfs_readpage(struct file *file, struct page *page);
3162 void btrfs_evict_inode(struct inode *inode);
3163 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3164 struct inode *btrfs_alloc_inode(struct super_block *sb);
3165 void btrfs_destroy_inode(struct inode *inode);
3166 void btrfs_free_inode(struct inode *inode);
3167 int btrfs_drop_inode(struct inode *inode);
3168 int __init btrfs_init_cachep(void);
3169 void __cold btrfs_destroy_cachep(void);
3170 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3171 struct btrfs_root *root, struct btrfs_path *path);
3172 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3173 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3174 struct page *page, size_t pg_offset,
3175 u64 start, u64 end);
3176 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3177 struct btrfs_root *root, struct btrfs_inode *inode);
3178 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3179 struct btrfs_root *root, struct btrfs_inode *inode);
3180 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3181 struct btrfs_inode *inode);
3182 int btrfs_orphan_cleanup(struct btrfs_root *root);
3183 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3184 void btrfs_add_delayed_iput(struct inode *inode);
3185 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3186 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3187 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3188 u64 start, u64 num_bytes, u64 min_size,
3189 loff_t actual_len, u64 *alloc_hint);
3190 int btrfs_prealloc_file_range_trans(struct inode *inode,
3191 struct btrfs_trans_handle *trans, int mode,
3192 u64 start, u64 num_bytes, u64 min_size,
3193 loff_t actual_len, u64 *alloc_hint);
3194 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3195 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3196 struct writeback_control *wbc);
3197 int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end);
3198 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3199 struct page *page, u64 start,
3200 u64 end, int uptodate);
3201 extern const struct dentry_operations btrfs_dentry_operations;
3202 extern const struct iomap_ops btrfs_dio_iomap_ops;
3203 extern const struct iomap_dio_ops btrfs_dio_ops;
3205 /* Inode locking type flags, by default the exclusive lock is taken */
3206 #define BTRFS_ILOCK_SHARED (1U << 0)
3207 #define BTRFS_ILOCK_TRY (1U << 1)
3208 #define BTRFS_ILOCK_MMAP (1U << 2)
3210 int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3211 void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3212 void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3213 const u64 add_bytes,
3214 const u64 del_bytes);
3217 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3218 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3219 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3220 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3221 struct dentry *dentry, struct fileattr *fa);
3222 int btrfs_ioctl_get_supported_features(void __user *arg);
3223 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3224 int __pure btrfs_is_empty_uuid(u8 *uuid);
3225 int btrfs_defrag_file(struct inode *inode, struct file *file,
3226 struct btrfs_ioctl_defrag_range_args *range,
3227 u64 newer_than, unsigned long max_pages);
3228 void btrfs_get_block_group_info(struct list_head *groups_list,
3229 struct btrfs_ioctl_space_info *space);
3230 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3231 struct btrfs_ioctl_balance_args *bargs);
3232 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3233 enum btrfs_exclusive_operation type);
3234 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3235 enum btrfs_exclusive_operation type);
3236 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3237 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3240 int __init btrfs_auto_defrag_init(void);
3241 void __cold btrfs_auto_defrag_exit(void);
3242 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3243 struct btrfs_inode *inode);
3244 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3245 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3246 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3247 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3249 extern const struct file_operations btrfs_file_operations;
3250 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3251 struct btrfs_root *root, struct btrfs_inode *inode,
3252 struct btrfs_drop_extents_args *args);
3253 int btrfs_replace_file_extents(struct btrfs_inode *inode,
3254 struct btrfs_path *path, const u64 start,
3256 struct btrfs_replace_extent_info *extent_info,
3257 struct btrfs_trans_handle **trans_out);
3258 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3259 struct btrfs_inode *inode, u64 start, u64 end);
3260 int btrfs_release_file(struct inode *inode, struct file *file);
3261 int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3262 size_t num_pages, loff_t pos, size_t write_bytes,
3263 struct extent_state **cached, bool noreserve);
3264 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3265 int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3266 size_t *write_bytes);
3267 void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3270 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3271 struct btrfs_root *root);
3274 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3275 unsigned long new_flags);
3276 int btrfs_sync_fs(struct super_block *sb, int wait);
3277 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3278 u64 subvol_objectid);
3280 static inline __printf(2, 3) __cold
3281 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3285 #ifdef CONFIG_PRINTK
3288 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3290 #define btrfs_printk(fs_info, fmt, args...) \
3291 btrfs_no_printk(fs_info, fmt, ##args)
3294 #define btrfs_emerg(fs_info, fmt, args...) \
3295 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3296 #define btrfs_alert(fs_info, fmt, args...) \
3297 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3298 #define btrfs_crit(fs_info, fmt, args...) \
3299 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3300 #define btrfs_err(fs_info, fmt, args...) \
3301 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3302 #define btrfs_warn(fs_info, fmt, args...) \
3303 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3304 #define btrfs_notice(fs_info, fmt, args...) \
3305 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3306 #define btrfs_info(fs_info, fmt, args...) \
3307 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3310 * Wrappers that use printk_in_rcu
3312 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3313 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3314 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3315 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3316 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3317 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3318 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3319 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3320 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3321 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3322 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3323 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3324 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3325 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3328 * Wrappers that use a ratelimited printk_in_rcu
3330 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3331 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3332 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3333 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3334 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3335 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3336 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3337 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3338 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3339 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3340 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3341 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3342 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3343 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3346 * Wrappers that use a ratelimited printk
3348 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3349 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3350 #define btrfs_alert_rl(fs_info, fmt, args...) \
3351 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3352 #define btrfs_crit_rl(fs_info, fmt, args...) \
3353 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3354 #define btrfs_err_rl(fs_info, fmt, args...) \
3355 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3356 #define btrfs_warn_rl(fs_info, fmt, args...) \
3357 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3358 #define btrfs_notice_rl(fs_info, fmt, args...) \
3359 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3360 #define btrfs_info_rl(fs_info, fmt, args...) \
3361 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3363 #if defined(CONFIG_DYNAMIC_DEBUG)
3364 #define btrfs_debug(fs_info, fmt, args...) \
3365 _dynamic_func_call_no_desc(fmt, btrfs_printk, \
3366 fs_info, KERN_DEBUG fmt, ##args)
3367 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3368 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \
3369 fs_info, KERN_DEBUG fmt, ##args)
3370 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3371 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \
3372 fs_info, KERN_DEBUG fmt, ##args)
3373 #define btrfs_debug_rl(fs_info, fmt, args...) \
3374 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \
3375 fs_info, KERN_DEBUG fmt, ##args)
3376 #elif defined(DEBUG)
3377 #define btrfs_debug(fs_info, fmt, args...) \
3378 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3379 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3380 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3381 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3382 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3383 #define btrfs_debug_rl(fs_info, fmt, args...) \
3384 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3386 #define btrfs_debug(fs_info, fmt, args...) \
3387 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3388 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3389 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3390 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3391 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3392 #define btrfs_debug_rl(fs_info, fmt, args...) \
3393 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3396 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3399 btrfs_printk(fs_info, fmt, ##args); \
3400 rcu_read_unlock(); \
3403 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \
3406 btrfs_no_printk(fs_info, fmt, ##args); \
3407 rcu_read_unlock(); \
3410 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3412 static DEFINE_RATELIMIT_STATE(_rs, \
3413 DEFAULT_RATELIMIT_INTERVAL, \
3414 DEFAULT_RATELIMIT_BURST); \
3415 if (__ratelimit(&_rs)) \
3416 btrfs_printk(fs_info, fmt, ##args); \
3419 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3422 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3423 rcu_read_unlock(); \
3426 #ifdef CONFIG_BTRFS_ASSERT
3428 static inline void assertfail(const char *expr, const char *file, int line)
3430 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3434 #define ASSERT(expr) \
3435 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3438 static inline void assertfail(const char *expr, const char* file, int line) { }
3439 #define ASSERT(expr) (void)(expr)
3442 #if BITS_PER_LONG == 32
3443 #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3445 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3446 * addresses of extents.
3448 * For 4K page size it's about 10T, for 64K it's 160T.
3450 #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3451 void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3452 void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3456 * Get the correct offset inside the page of extent buffer.
3458 * @eb: target extent buffer
3459 * @start: offset inside the extent buffer
3461 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3463 static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3464 unsigned long offset)
3467 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3468 * to PAGE_SIZE, thus adding it won't cause any difference.
3470 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3471 * to the eb, thus we have to take the eb->start into consideration.
3473 return offset_in_page(offset + eb->start);
3476 static inline unsigned long get_eb_page_index(unsigned long offset)
3479 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3481 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3482 * and have ensured that all tree blocks are contained in one page,
3483 * thus we always get index == 0.
3485 return offset >> PAGE_SHIFT;
3489 * Use that for functions that are conditionally exported for sanity tests but
3492 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3493 #define EXPORT_FOR_TESTS static
3495 #define EXPORT_FOR_TESTS
3499 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3502 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3507 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3508 unsigned int line, int errno, const char *fmt, ...);
3510 const char * __attribute_const__ btrfs_decode_error(int errno);
3513 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3514 const char *function,
3515 unsigned int line, int errno);
3518 * Call btrfs_abort_transaction as early as possible when an error condition is
3519 * detected, that way the exact line number is reported.
3521 #define btrfs_abort_transaction(trans, errno) \
3523 /* Report first abort since mount */ \
3524 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3525 &((trans)->fs_info->fs_state))) { \
3526 if ((errno) != -EIO && (errno) != -EROFS) { \
3527 WARN(1, KERN_DEBUG \
3528 "BTRFS: Transaction aborted (error %d)\n", \
3531 btrfs_debug((trans)->fs_info, \
3532 "Transaction aborted (error %d)", \
3536 __btrfs_abort_transaction((trans), __func__, \
3537 __LINE__, (errno)); \
3540 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3542 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3543 (errno), fmt, ##args); \
3548 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3549 unsigned int line, int errno, const char *fmt, ...);
3551 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3552 * will panic(). Otherwise we BUG() here.
3554 #define btrfs_panic(fs_info, errno, fmt, args...) \
3556 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3561 /* compatibility and incompatibility defines */
3563 #define btrfs_set_fs_incompat(__fs_info, opt) \
3564 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3567 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3568 u64 flag, const char* name)
3570 struct btrfs_super_block *disk_super;
3573 disk_super = fs_info->super_copy;
3574 features = btrfs_super_incompat_flags(disk_super);
3575 if (!(features & flag)) {
3576 spin_lock(&fs_info->super_lock);
3577 features = btrfs_super_incompat_flags(disk_super);
3578 if (!(features & flag)) {
3580 btrfs_set_super_incompat_flags(disk_super, features);
3582 "setting incompat feature flag for %s (0x%llx)",
3585 spin_unlock(&fs_info->super_lock);
3589 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3590 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3593 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3594 u64 flag, const char* name)
3596 struct btrfs_super_block *disk_super;
3599 disk_super = fs_info->super_copy;
3600 features = btrfs_super_incompat_flags(disk_super);
3601 if (features & flag) {
3602 spin_lock(&fs_info->super_lock);
3603 features = btrfs_super_incompat_flags(disk_super);
3604 if (features & flag) {
3606 btrfs_set_super_incompat_flags(disk_super, features);
3608 "clearing incompat feature flag for %s (0x%llx)",
3611 spin_unlock(&fs_info->super_lock);
3615 #define btrfs_fs_incompat(fs_info, opt) \
3616 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3618 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3620 struct btrfs_super_block *disk_super;
3621 disk_super = fs_info->super_copy;
3622 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3625 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3626 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3629 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3630 u64 flag, const char *name)
3632 struct btrfs_super_block *disk_super;
3635 disk_super = fs_info->super_copy;
3636 features = btrfs_super_compat_ro_flags(disk_super);
3637 if (!(features & flag)) {
3638 spin_lock(&fs_info->super_lock);
3639 features = btrfs_super_compat_ro_flags(disk_super);
3640 if (!(features & flag)) {
3642 btrfs_set_super_compat_ro_flags(disk_super, features);
3644 "setting compat-ro feature flag for %s (0x%llx)",
3647 spin_unlock(&fs_info->super_lock);
3651 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3652 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3655 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3656 u64 flag, const char *name)
3658 struct btrfs_super_block *disk_super;
3661 disk_super = fs_info->super_copy;
3662 features = btrfs_super_compat_ro_flags(disk_super);
3663 if (features & flag) {
3664 spin_lock(&fs_info->super_lock);
3665 features = btrfs_super_compat_ro_flags(disk_super);
3666 if (features & flag) {
3668 btrfs_set_super_compat_ro_flags(disk_super, features);
3670 "clearing compat-ro feature flag for %s (0x%llx)",
3673 spin_unlock(&fs_info->super_lock);
3677 #define btrfs_fs_compat_ro(fs_info, opt) \
3678 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3680 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3682 struct btrfs_super_block *disk_super;
3683 disk_super = fs_info->super_copy;
3684 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3688 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3689 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3690 int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3691 struct posix_acl *acl, int type);
3692 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3693 struct inode *inode, struct inode *dir);
3695 #define btrfs_get_acl NULL
3696 #define btrfs_set_acl NULL
3697 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3698 struct inode *inode, struct inode *dir)
3705 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3706 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3707 struct btrfs_root *root);
3708 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3709 struct btrfs_root *root);
3710 int btrfs_recover_relocation(struct btrfs_root *root);
3711 int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3712 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3713 struct btrfs_root *root, struct extent_buffer *buf,
3714 struct extent_buffer *cow);
3715 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3716 u64 *bytes_to_reserve);
3717 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3718 struct btrfs_pending_snapshot *pending);
3719 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3720 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3722 int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3725 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3726 u64 end, struct btrfs_scrub_progress *progress,
3727 int readonly, int is_dev_replace);
3728 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3729 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3730 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3731 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3732 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3733 struct btrfs_scrub_progress *progress);
3734 static inline void btrfs_init_full_stripe_locks_tree(
3735 struct btrfs_full_stripe_locks_tree *locks_root)
3737 locks_root->root = RB_ROOT;
3738 mutex_init(&locks_root->lock);
3742 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3743 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3744 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3746 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3748 btrfs_bio_counter_sub(fs_info, 1);
3752 struct reada_control {
3753 struct btrfs_fs_info *fs_info; /* tree to prefetch */
3754 struct btrfs_key key_start;
3755 struct btrfs_key key_end; /* exclusive */
3758 wait_queue_head_t wait;
3760 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3761 struct btrfs_key *start, struct btrfs_key *end);
3762 int btrfs_reada_wait(void *handle);
3763 void btrfs_reada_detach(void *handle);
3764 int btree_readahead_hook(struct extent_buffer *eb, int err);
3765 void btrfs_reada_remove_dev(struct btrfs_device *dev);
3766 void btrfs_reada_undo_remove_dev(struct btrfs_device *dev);
3768 static inline int is_fstree(u64 rootid)
3770 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3771 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3772 !btrfs_qgroup_level(rootid)))
3777 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3779 return signal_pending(current);
3782 /* Sanity test specific functions */
3783 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3784 void btrfs_test_destroy_inode(struct inode *inode);
3785 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3787 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3790 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3796 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
3798 return fs_info->zoned != 0;
3802 * We use page status Private2 to indicate there is an ordered extent with
3805 * Rename the Private2 accessors to Ordered, to improve readability.
3807 #define PageOrdered(page) PagePrivate2(page)
3808 #define SetPageOrdered(page) SetPagePrivate2(page)
3809 #define ClearPageOrdered(page) ClearPagePrivate2(page)