2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #ifndef __BTRFS_CTREE__
20 #define __BTRFS_CTREE__
22 #include <linux/version.h>
24 #include <linux/highmem.h>
26 #include <linux/completion.h>
27 #include <linux/backing-dev.h>
28 #include <linux/wait.h>
29 #include <linux/slab.h>
30 #include <asm/kmap_types.h>
31 #include "extent_io.h"
32 #include "extent_map.h"
33 #include "async-thread.h"
35 struct btrfs_trans_handle;
36 struct btrfs_transaction;
37 struct btrfs_pending_snapshot;
38 extern struct kmem_cache *btrfs_trans_handle_cachep;
39 extern struct kmem_cache *btrfs_transaction_cachep;
40 extern struct kmem_cache *btrfs_bit_radix_cachep;
41 extern struct kmem_cache *btrfs_path_cachep;
42 struct btrfs_ordered_sum;
44 #define BTRFS_MAGIC "_BHRfS_M"
46 #define BTRFS_MAX_LEVEL 8
48 #define BTRFS_COMPAT_EXTENT_TREE_V0
51 * files bigger than this get some pre-flushing when they are added
52 * to the ordered operations list. That way we limit the total
53 * work done by the commit
55 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
57 /* holds pointers to all of the tree roots */
58 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
60 /* stores information about which extents are in use, and reference counts */
61 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
64 * chunk tree stores translations from logical -> physical block numbering
65 * the super block points to the chunk tree
67 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
70 * stores information about which areas of a given device are in use.
71 * one per device. The tree of tree roots points to the device tree
73 #define BTRFS_DEV_TREE_OBJECTID 4ULL
75 /* one per subvolume, storing files and directories */
76 #define BTRFS_FS_TREE_OBJECTID 5ULL
78 /* directory objectid inside the root tree */
79 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
81 /* holds checksums of all the data extents */
82 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
84 /* orhpan objectid for tracking unlinked/truncated files */
85 #define BTRFS_ORPHAN_OBJECTID -5ULL
87 /* does write ahead logging to speed up fsyncs */
88 #define BTRFS_TREE_LOG_OBJECTID -6ULL
89 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
91 /* for space balancing */
92 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
93 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
96 * extent checksums all have this objectid
97 * this allows them to share the logging tree
100 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
102 /* For storing free space cache */
103 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
105 /* dummy objectid represents multiple objectids */
106 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
109 * All files have objectids in this range.
111 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
112 #define BTRFS_LAST_FREE_OBJECTID -256ULL
113 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
117 * the device items go into the chunk tree. The key is in the form
118 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
120 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
122 #define BTRFS_BTREE_INODE_OBJECTID 1
124 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
127 * we can actually store much bigger names, but lets not confuse the rest
130 #define BTRFS_NAME_LEN 255
132 /* 32 bytes in various csum fields */
133 #define BTRFS_CSUM_SIZE 32
136 #define BTRFS_CSUM_TYPE_CRC32 0
138 static int btrfs_csum_sizes[] = { 4, 0 };
140 /* four bytes for CRC32 */
141 #define BTRFS_EMPTY_DIR_SIZE 0
143 #define BTRFS_FT_UNKNOWN 0
144 #define BTRFS_FT_REG_FILE 1
145 #define BTRFS_FT_DIR 2
146 #define BTRFS_FT_CHRDEV 3
147 #define BTRFS_FT_BLKDEV 4
148 #define BTRFS_FT_FIFO 5
149 #define BTRFS_FT_SOCK 6
150 #define BTRFS_FT_SYMLINK 7
151 #define BTRFS_FT_XATTR 8
152 #define BTRFS_FT_MAX 9
155 * The key defines the order in the tree, and so it also defines (optimal)
158 * objectid corresponds to the inode number.
160 * type tells us things about the object, and is a kind of stream selector.
161 * so for a given inode, keys with type of 1 might refer to the inode data,
162 * type of 2 may point to file data in the btree and type == 3 may point to
165 * offset is the starting byte offset for this key in the stream.
167 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
168 * in cpu native order. Otherwise they are identical and their sizes
169 * should be the same (ie both packed)
171 struct btrfs_disk_key {
175 } __attribute__ ((__packed__));
181 } __attribute__ ((__packed__));
183 struct btrfs_mapping_tree {
184 struct extent_map_tree map_tree;
187 #define BTRFS_UUID_SIZE 16
188 struct btrfs_dev_item {
189 /* the internal btrfs device id */
192 /* size of the device */
198 /* optimal io alignment for this device */
201 /* optimal io width for this device */
204 /* minimal io size for this device */
207 /* type and info about this device */
210 /* expected generation for this device */
214 * starting byte of this partition on the device,
215 * to allow for stripe alignment in the future
219 /* grouping information for allocation decisions */
222 /* seek speed 0-100 where 100 is fastest */
225 /* bandwidth 0-100 where 100 is fastest */
228 /* btrfs generated uuid for this device */
229 u8 uuid[BTRFS_UUID_SIZE];
231 /* uuid of FS who owns this device */
232 u8 fsid[BTRFS_UUID_SIZE];
233 } __attribute__ ((__packed__));
235 struct btrfs_stripe {
238 u8 dev_uuid[BTRFS_UUID_SIZE];
239 } __attribute__ ((__packed__));
242 /* size of this chunk in bytes */
245 /* objectid of the root referencing this chunk */
251 /* optimal io alignment for this chunk */
254 /* optimal io width for this chunk */
257 /* minimal io size for this chunk */
260 /* 2^16 stripes is quite a lot, a second limit is the size of a single
265 /* sub stripes only matter for raid10 */
267 struct btrfs_stripe stripe;
268 /* additional stripes go here */
269 } __attribute__ ((__packed__));
271 #define BTRFS_FREE_SPACE_EXTENT 1
272 #define BTRFS_FREE_SPACE_BITMAP 2
274 struct btrfs_free_space_entry {
278 } __attribute__ ((__packed__));
280 struct btrfs_free_space_header {
281 struct btrfs_disk_key location;
285 } __attribute__ ((__packed__));
287 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
289 BUG_ON(num_stripes == 0);
290 return sizeof(struct btrfs_chunk) +
291 sizeof(struct btrfs_stripe) * (num_stripes - 1);
294 #define BTRFS_FSID_SIZE 16
295 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
296 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
297 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
298 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
300 #define BTRFS_BACKREF_REV_MAX 256
301 #define BTRFS_BACKREF_REV_SHIFT 56
302 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
303 BTRFS_BACKREF_REV_SHIFT)
305 #define BTRFS_OLD_BACKREF_REV 0
306 #define BTRFS_MIXED_BACKREF_REV 1
309 * every tree block (leaf or node) starts with this header.
311 struct btrfs_header {
312 /* these first four must match the super block */
313 u8 csum[BTRFS_CSUM_SIZE];
314 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
315 __le64 bytenr; /* which block this node is supposed to live in */
318 /* allowed to be different from the super from here on down */
319 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
324 } __attribute__ ((__packed__));
326 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
327 sizeof(struct btrfs_header)) / \
328 sizeof(struct btrfs_key_ptr))
329 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
330 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
331 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
332 sizeof(struct btrfs_item) - \
333 sizeof(struct btrfs_file_extent_item))
334 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
335 sizeof(struct btrfs_item) -\
336 sizeof(struct btrfs_dir_item))
340 * this is a very generous portion of the super block, giving us
341 * room to translate 14 chunks with 3 stripes each.
343 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
344 #define BTRFS_LABEL_SIZE 256
347 * the super block basically lists the main trees of the FS
348 * it currently lacks any block count etc etc
350 struct btrfs_super_block {
351 u8 csum[BTRFS_CSUM_SIZE];
352 /* the first 4 fields must match struct btrfs_header */
353 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
354 __le64 bytenr; /* this block number */
357 /* allowed to be different from the btrfs_header from here own down */
364 /* this will help find the new super based on the log root */
365 __le64 log_root_transid;
368 __le64 root_dir_objectid;
374 __le32 sys_chunk_array_size;
375 __le64 chunk_root_generation;
377 __le64 compat_ro_flags;
378 __le64 incompat_flags;
383 struct btrfs_dev_item dev_item;
385 char label[BTRFS_LABEL_SIZE];
387 __le64 cache_generation;
389 /* future expansion */
391 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
392 } __attribute__ ((__packed__));
395 * Compat flags that we support. If any incompat flags are set other than the
396 * ones specified below then we will fail to mount
398 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
399 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
400 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
402 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
403 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
404 #define BTRFS_FEATURE_INCOMPAT_SUPP \
405 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
406 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
407 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
410 * A leaf is full of items. offset and size tell us where to find
411 * the item in the leaf (relative to the start of the data area)
414 struct btrfs_disk_key key;
417 } __attribute__ ((__packed__));
420 * leaves have an item area and a data area:
421 * [item0, item1....itemN] [free space] [dataN...data1, data0]
423 * The data is separate from the items to get the keys closer together
427 struct btrfs_header header;
428 struct btrfs_item items[];
429 } __attribute__ ((__packed__));
432 * all non-leaf blocks are nodes, they hold only keys and pointers to
435 struct btrfs_key_ptr {
436 struct btrfs_disk_key key;
439 } __attribute__ ((__packed__));
442 struct btrfs_header header;
443 struct btrfs_key_ptr ptrs[];
444 } __attribute__ ((__packed__));
447 * btrfs_paths remember the path taken from the root down to the leaf.
448 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
449 * to any other levels that are present.
451 * The slots array records the index of the item or block pointer
452 * used while walking the tree.
455 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
456 int slots[BTRFS_MAX_LEVEL];
457 /* if there is real range locking, this locks field will change */
458 int locks[BTRFS_MAX_LEVEL];
460 /* keep some upper locks as we walk down */
464 * set by btrfs_split_item, tells search_slot to keep all locks
465 * and to force calls to keep space in the nodes
467 unsigned int search_for_split:1;
468 unsigned int keep_locks:1;
469 unsigned int skip_locking:1;
470 unsigned int leave_spinning:1;
471 unsigned int search_commit_root:1;
475 * items in the extent btree are used to record the objectid of the
476 * owner of the block and the number of references
479 struct btrfs_extent_item {
483 } __attribute__ ((__packed__));
485 struct btrfs_extent_item_v0 {
487 } __attribute__ ((__packed__));
489 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
490 sizeof(struct btrfs_item))
492 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
493 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
495 /* following flags only apply to tree blocks */
497 /* use full backrefs for extent pointers in the block */
498 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
500 struct btrfs_tree_block_info {
501 struct btrfs_disk_key key;
503 } __attribute__ ((__packed__));
505 struct btrfs_extent_data_ref {
510 } __attribute__ ((__packed__));
512 struct btrfs_shared_data_ref {
514 } __attribute__ ((__packed__));
516 struct btrfs_extent_inline_ref {
519 } __attribute__ ((__packed__));
521 /* old style backrefs item */
522 struct btrfs_extent_ref_v0 {
527 } __attribute__ ((__packed__));
530 /* dev extents record free space on individual devices. The owner
531 * field points back to the chunk allocation mapping tree that allocated
532 * the extent. The chunk tree uuid field is a way to double check the owner
534 struct btrfs_dev_extent {
536 __le64 chunk_objectid;
539 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
540 } __attribute__ ((__packed__));
542 struct btrfs_inode_ref {
546 } __attribute__ ((__packed__));
548 struct btrfs_timespec {
551 } __attribute__ ((__packed__));
553 enum btrfs_compression_type {
554 BTRFS_COMPRESS_NONE = 0,
555 BTRFS_COMPRESS_ZLIB = 1,
556 BTRFS_COMPRESS_LAST = 2,
559 struct btrfs_inode_item {
560 /* nfs style generation number */
562 /* transid that last touched this inode */
574 /* modification sequence number for NFS */
578 * a little future expansion, for more than this we can
579 * just grow the inode item and version it
582 struct btrfs_timespec atime;
583 struct btrfs_timespec ctime;
584 struct btrfs_timespec mtime;
585 struct btrfs_timespec otime;
586 } __attribute__ ((__packed__));
588 struct btrfs_dir_log_item {
590 } __attribute__ ((__packed__));
592 struct btrfs_dir_item {
593 struct btrfs_disk_key location;
598 } __attribute__ ((__packed__));
600 struct btrfs_root_item {
601 struct btrfs_inode_item inode;
607 __le64 last_snapshot;
610 struct btrfs_disk_key drop_progress;
613 } __attribute__ ((__packed__));
616 * this is used for both forward and backward root refs
618 struct btrfs_root_ref {
622 } __attribute__ ((__packed__));
624 #define BTRFS_FILE_EXTENT_INLINE 0
625 #define BTRFS_FILE_EXTENT_REG 1
626 #define BTRFS_FILE_EXTENT_PREALLOC 2
628 struct btrfs_file_extent_item {
630 * transaction id that created this extent
634 * max number of bytes to hold this extent in ram
635 * when we split a compressed extent we can't know how big
636 * each of the resulting pieces will be. So, this is
637 * an upper limit on the size of the extent in ram instead of
643 * 32 bits for the various ways we might encode the data,
644 * including compression and encryption. If any of these
645 * are set to something a given disk format doesn't understand
646 * it is treated like an incompat flag for reading and writing,
651 __le16 other_encoding; /* spare for later use */
653 /* are we inline data or a real extent? */
657 * disk space consumed by the extent, checksum blocks are included
661 __le64 disk_num_bytes;
663 * the logical offset in file blocks (no csums)
664 * this extent record is for. This allows a file extent to point
665 * into the middle of an existing extent on disk, sharing it
666 * between two snapshots (useful if some bytes in the middle of the
667 * extent have changed
671 * the logical number of file blocks (no csums included). This
672 * always reflects the size uncompressed and without encoding.
676 } __attribute__ ((__packed__));
678 struct btrfs_csum_item {
680 } __attribute__ ((__packed__));
682 /* different types of block groups (and chunks) */
683 #define BTRFS_BLOCK_GROUP_DATA (1 << 0)
684 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
685 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
686 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
687 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
688 #define BTRFS_BLOCK_GROUP_DUP (1 << 5)
689 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
690 #define BTRFS_NR_RAID_TYPES 5
692 struct btrfs_block_group_item {
694 __le64 chunk_objectid;
696 } __attribute__ ((__packed__));
698 struct btrfs_space_info {
701 u64 total_bytes; /* total bytes in the space */
702 u64 bytes_used; /* total bytes used,
703 this does't take mirrors into account */
704 u64 bytes_pinned; /* total bytes pinned, will be freed when the
705 transaction finishes */
706 u64 bytes_reserved; /* total bytes the allocator has reserved for
707 current allocations */
708 u64 bytes_readonly; /* total bytes that are read only */
710 u64 bytes_may_use; /* number of bytes that may be used for
711 delalloc/allocations */
712 u64 disk_used; /* total bytes used on disk */
714 int full; /* indicates that we cannot allocate any more
715 chunks for this space */
716 int force_alloc; /* set if we need to force a chunk alloc for
719 struct list_head list;
721 /* for block groups in our same type */
722 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
724 struct rw_semaphore groups_sem;
725 atomic_t caching_threads;
728 struct btrfs_block_rsv {
732 struct btrfs_space_info *space_info;
733 struct list_head list;
736 unsigned int priority:8;
737 unsigned int durable:1;
738 unsigned int refill_used:1;
743 * free clusters are used to claim free space in relatively large chunks,
744 * allowing us to do less seeky writes. They are used for all metadata
745 * allocations and data allocations in ssd mode.
747 struct btrfs_free_cluster {
749 spinlock_t refill_lock;
752 /* largest extent in this cluster */
755 /* first extent starting offset */
758 /* if this cluster simply points at a bitmap in the block group */
759 bool points_to_bitmap;
761 struct btrfs_block_group_cache *block_group;
763 * when a cluster is allocated from a block group, we put the
764 * cluster onto a list in the block group so that it can
765 * be freed before the block group is freed.
767 struct list_head block_group_list;
770 enum btrfs_caching_type {
772 BTRFS_CACHE_STARTED = 1,
773 BTRFS_CACHE_FINISHED = 2,
776 enum btrfs_disk_cache_state {
777 BTRFS_DC_WRITTEN = 0,
781 BTRFS_DC_NEED_WRITE = 4,
784 struct btrfs_caching_control {
785 struct list_head list;
787 wait_queue_head_t wait;
788 struct btrfs_block_group_cache *block_group;
793 struct btrfs_block_group_cache {
794 struct btrfs_key key;
795 struct btrfs_block_group_item item;
796 struct btrfs_fs_info *fs_info;
812 int disk_cache_state;
814 /* cache tracking stuff */
816 struct btrfs_caching_control *caching_ctl;
817 u64 last_byte_to_unpin;
819 struct btrfs_space_info *space_info;
821 /* free space cache stuff */
822 spinlock_t tree_lock;
823 struct rb_root free_space_offset;
826 /* block group cache stuff */
827 struct rb_node cache_node;
829 /* for block groups in the same raid type */
830 struct list_head list;
835 /* List of struct btrfs_free_clusters for this block group.
836 * Today it will only have one thing on it, but that may change
838 struct list_head cluster_list;
841 struct reloc_control;
843 struct btrfs_fs_devices;
844 struct btrfs_fs_info {
845 u8 fsid[BTRFS_FSID_SIZE];
846 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
847 struct btrfs_root *extent_root;
848 struct btrfs_root *tree_root;
849 struct btrfs_root *chunk_root;
850 struct btrfs_root *dev_root;
851 struct btrfs_root *fs_root;
852 struct btrfs_root *csum_root;
854 /* the log root tree is a directory of all the other log roots */
855 struct btrfs_root *log_root_tree;
857 spinlock_t fs_roots_radix_lock;
858 struct radix_tree_root fs_roots_radix;
860 /* block group cache stuff */
861 spinlock_t block_group_cache_lock;
862 struct rb_root block_group_cache_tree;
864 struct extent_io_tree freed_extents[2];
865 struct extent_io_tree *pinned_extents;
867 /* logical->physical extent mapping */
868 struct btrfs_mapping_tree mapping_tree;
870 /* block reservation for extent, checksum and root tree */
871 struct btrfs_block_rsv global_block_rsv;
872 /* block reservation for delay allocation */
873 struct btrfs_block_rsv delalloc_block_rsv;
874 /* block reservation for metadata operations */
875 struct btrfs_block_rsv trans_block_rsv;
876 /* block reservation for chunk tree */
877 struct btrfs_block_rsv chunk_block_rsv;
879 struct btrfs_block_rsv empty_block_rsv;
881 /* list of block reservations that cross multiple transactions */
882 struct list_head durable_block_rsv_list;
884 struct mutex durable_block_rsv_mutex;
887 u64 last_trans_committed;
890 * this is updated to the current trans every time a full commit
891 * is required instead of the faster short fsync log commits
893 u64 last_trans_log_full_commit;
894 u64 open_ioctl_trans;
895 unsigned long mount_opt;
898 struct btrfs_transaction *running_transaction;
899 wait_queue_head_t transaction_throttle;
900 wait_queue_head_t transaction_wait;
901 wait_queue_head_t async_submit_wait;
903 struct btrfs_super_block super_copy;
904 struct btrfs_super_block super_for_commit;
905 struct block_device *__bdev;
906 struct super_block *sb;
907 struct inode *btree_inode;
908 struct backing_dev_info bdi;
909 struct mutex trans_mutex;
910 struct mutex tree_log_mutex;
911 struct mutex transaction_kthread_mutex;
912 struct mutex cleaner_mutex;
913 struct mutex chunk_mutex;
914 struct mutex volume_mutex;
916 * this protects the ordered operations list only while we are
917 * processing all of the entries on it. This way we make
918 * sure the commit code doesn't find the list temporarily empty
919 * because another function happens to be doing non-waiting preflush
920 * before jumping into the main commit.
922 struct mutex ordered_operations_mutex;
923 struct rw_semaphore extent_commit_sem;
925 struct rw_semaphore cleanup_work_sem;
927 struct rw_semaphore subvol_sem;
928 struct srcu_struct subvol_srcu;
930 struct list_head trans_list;
931 struct list_head hashers;
932 struct list_head dead_roots;
933 struct list_head caching_block_groups;
935 spinlock_t delayed_iput_lock;
936 struct list_head delayed_iputs;
938 atomic_t nr_async_submits;
939 atomic_t async_submit_draining;
940 atomic_t nr_async_bios;
941 atomic_t async_delalloc_pages;
944 * this is used by the balancing code to wait for all the pending
947 spinlock_t ordered_extent_lock;
950 * all of the data=ordered extents pending writeback
951 * these can span multiple transactions and basically include
952 * every dirty data page that isn't from nodatacow
954 struct list_head ordered_extents;
957 * all of the inodes that have delalloc bytes. It is possible for
958 * this list to be empty even when there is still dirty data=ordered
959 * extents waiting to finish IO.
961 struct list_head delalloc_inodes;
964 * special rename and truncate targets that must be on disk before
965 * we're allowed to commit. This is basically the ext3 style
968 struct list_head ordered_operations;
971 * there is a pool of worker threads for checksumming during writes
972 * and a pool for checksumming after reads. This is because readers
973 * can run with FS locks held, and the writers may be waiting for
974 * those locks. We don't want ordering in the pending list to cause
975 * deadlocks, and so the two are serviced separately.
977 * A third pool does submit_bio to avoid deadlocking with the other
980 struct btrfs_workers generic_worker;
981 struct btrfs_workers workers;
982 struct btrfs_workers delalloc_workers;
983 struct btrfs_workers endio_workers;
984 struct btrfs_workers endio_meta_workers;
985 struct btrfs_workers endio_meta_write_workers;
986 struct btrfs_workers endio_write_workers;
987 struct btrfs_workers endio_freespace_worker;
988 struct btrfs_workers submit_workers;
990 * fixup workers take dirty pages that didn't properly go through
991 * the cow mechanism and make them safe to write. It happens
992 * for the sys_munmap function call path
994 struct btrfs_workers fixup_workers;
995 struct task_struct *transaction_kthread;
996 struct task_struct *cleaner_kthread;
997 int thread_pool_size;
999 struct kobject super_kobj;
1000 struct completion kobj_unregister;
1003 int log_root_recovering;
1008 /* protected by the delalloc lock, used to keep from writing
1009 * metadata until there is a nice batch
1011 u64 dirty_metadata_bytes;
1012 struct list_head dirty_cowonly_roots;
1014 struct btrfs_fs_devices *fs_devices;
1017 * the space_info list is almost entirely read only. It only changes
1018 * when we add a new raid type to the FS, and that happens
1019 * very rarely. RCU is used to protect it.
1021 struct list_head space_info;
1023 struct reloc_control *reloc_ctl;
1025 spinlock_t delalloc_lock;
1026 spinlock_t new_trans_lock;
1029 /* data_alloc_cluster is only used in ssd mode */
1030 struct btrfs_free_cluster data_alloc_cluster;
1032 /* all metadata allocations go through this cluster */
1033 struct btrfs_free_cluster meta_alloc_cluster;
1035 spinlock_t ref_cache_lock;
1036 u64 total_ref_cache_size;
1038 u64 avail_data_alloc_bits;
1039 u64 avail_metadata_alloc_bits;
1040 u64 avail_system_alloc_bits;
1041 u64 data_alloc_profile;
1042 u64 metadata_alloc_profile;
1043 u64 system_alloc_profile;
1045 unsigned data_chunk_allocations;
1046 unsigned metadata_ratio;
1052 * in ram representation of the tree. extent_root is used for all allocations
1053 * and for the extent tree extent_root root.
1056 struct extent_buffer *node;
1058 /* the node lock is held while changing the node pointer */
1059 spinlock_t node_lock;
1061 struct extent_buffer *commit_root;
1062 struct btrfs_root *log_root;
1063 struct btrfs_root *reloc_root;
1065 struct btrfs_root_item root_item;
1066 struct btrfs_key root_key;
1067 struct btrfs_fs_info *fs_info;
1068 struct extent_io_tree dirty_log_pages;
1070 struct kobject root_kobj;
1071 struct completion kobj_unregister;
1072 struct mutex objectid_mutex;
1074 spinlock_t accounting_lock;
1075 struct btrfs_block_rsv *block_rsv;
1077 struct mutex log_mutex;
1078 wait_queue_head_t log_writer_wait;
1079 wait_queue_head_t log_commit_wait[2];
1080 atomic_t log_writers;
1081 atomic_t log_commit[2];
1082 unsigned long log_transid;
1083 unsigned long last_log_commit;
1084 unsigned long log_batch;
1085 pid_t log_start_pid;
1086 bool log_multiple_pids;
1091 /* data allocations are done in sectorsize units */
1094 /* node allocations are done in nodesize units */
1097 /* leaf allocations are done in leafsize units */
1104 u64 highest_objectid;
1109 u64 defrag_trans_start;
1110 struct btrfs_key defrag_progress;
1111 struct btrfs_key defrag_max;
1116 /* the dirty list is only used by non-reference counted roots */
1117 struct list_head dirty_list;
1119 struct list_head root_list;
1121 spinlock_t orphan_lock;
1122 struct list_head orphan_list;
1123 struct btrfs_block_rsv *orphan_block_rsv;
1124 int orphan_item_inserted;
1125 int orphan_cleanup_state;
1127 spinlock_t inode_lock;
1128 /* red-black tree that keeps track of in-memory inodes */
1129 struct rb_root inode_tree;
1132 * right now this just gets used so that a root has its own devid
1133 * for stat. It may be used for more later
1135 struct super_block anon_super;
1139 * inode items have the data typically returned from stat and store other
1140 * info about object characteristics. There is one for every file and dir in
1143 #define BTRFS_INODE_ITEM_KEY 1
1144 #define BTRFS_INODE_REF_KEY 12
1145 #define BTRFS_XATTR_ITEM_KEY 24
1146 #define BTRFS_ORPHAN_ITEM_KEY 48
1147 /* reserve 2-15 close to the inode for later flexibility */
1150 * dir items are the name -> inode pointers in a directory. There is one
1151 * for every name in a directory.
1153 #define BTRFS_DIR_LOG_ITEM_KEY 60
1154 #define BTRFS_DIR_LOG_INDEX_KEY 72
1155 #define BTRFS_DIR_ITEM_KEY 84
1156 #define BTRFS_DIR_INDEX_KEY 96
1158 * extent data is for file data
1160 #define BTRFS_EXTENT_DATA_KEY 108
1163 * extent csums are stored in a separate tree and hold csums for
1164 * an entire extent on disk.
1166 #define BTRFS_EXTENT_CSUM_KEY 128
1169 * root items point to tree roots. They are typically in the root
1170 * tree used by the super block to find all the other trees
1172 #define BTRFS_ROOT_ITEM_KEY 132
1175 * root backrefs tie subvols and snapshots to the directory entries that
1178 #define BTRFS_ROOT_BACKREF_KEY 144
1181 * root refs make a fast index for listing all of the snapshots and
1182 * subvolumes referenced by a given root. They point directly to the
1183 * directory item in the root that references the subvol
1185 #define BTRFS_ROOT_REF_KEY 156
1188 * extent items are in the extent map tree. These record which blocks
1189 * are used, and how many references there are to each block
1191 #define BTRFS_EXTENT_ITEM_KEY 168
1193 #define BTRFS_TREE_BLOCK_REF_KEY 176
1195 #define BTRFS_EXTENT_DATA_REF_KEY 178
1197 #define BTRFS_EXTENT_REF_V0_KEY 180
1199 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1201 #define BTRFS_SHARED_DATA_REF_KEY 184
1204 * block groups give us hints into the extent allocation trees. Which
1205 * blocks are free etc etc
1207 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1209 #define BTRFS_DEV_EXTENT_KEY 204
1210 #define BTRFS_DEV_ITEM_KEY 216
1211 #define BTRFS_CHUNK_ITEM_KEY 228
1214 * string items are for debugging. They just store a short string of
1217 #define BTRFS_STRING_ITEM_KEY 253
1219 #define BTRFS_MOUNT_NODATASUM (1 << 0)
1220 #define BTRFS_MOUNT_NODATACOW (1 << 1)
1221 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
1222 #define BTRFS_MOUNT_SSD (1 << 3)
1223 #define BTRFS_MOUNT_DEGRADED (1 << 4)
1224 #define BTRFS_MOUNT_COMPRESS (1 << 5)
1225 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
1226 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1227 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1228 #define BTRFS_MOUNT_NOSSD (1 << 9)
1229 #define BTRFS_MOUNT_DISCARD (1 << 10)
1230 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11)
1231 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12)
1232 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13)
1234 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1235 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1236 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1241 #define BTRFS_INODE_NODATASUM (1 << 0)
1242 #define BTRFS_INODE_NODATACOW (1 << 1)
1243 #define BTRFS_INODE_READONLY (1 << 2)
1244 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1245 #define BTRFS_INODE_PREALLOC (1 << 4)
1246 #define BTRFS_INODE_SYNC (1 << 5)
1247 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1248 #define BTRFS_INODE_APPEND (1 << 7)
1249 #define BTRFS_INODE_NODUMP (1 << 8)
1250 #define BTRFS_INODE_NOATIME (1 << 9)
1251 #define BTRFS_INODE_DIRSYNC (1 << 10)
1253 /* some macros to generate set/get funcs for the struct fields. This
1254 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1257 #define le8_to_cpu(v) (v)
1258 #define cpu_to_le8(v) (v)
1261 #define read_eb_member(eb, ptr, type, member, result) ( \
1262 read_extent_buffer(eb, (char *)(result), \
1263 ((unsigned long)(ptr)) + \
1264 offsetof(type, member), \
1265 sizeof(((type *)0)->member)))
1267 #define write_eb_member(eb, ptr, type, member, result) ( \
1268 write_extent_buffer(eb, (char *)(result), \
1269 ((unsigned long)(ptr)) + \
1270 offsetof(type, member), \
1271 sizeof(((type *)0)->member)))
1273 #ifndef BTRFS_SETGET_FUNCS
1274 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1275 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
1276 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1279 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1280 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1282 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1283 u##bits res = le##bits##_to_cpu(p->member); \
1284 kunmap_atomic(p, KM_USER0); \
1287 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1290 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1291 p->member = cpu_to_le##bits(val); \
1292 kunmap_atomic(p, KM_USER0); \
1295 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1296 static inline u##bits btrfs_##name(type *s) \
1298 return le##bits##_to_cpu(s->member); \
1300 static inline void btrfs_set_##name(type *s, u##bits val) \
1302 s->member = cpu_to_le##bits(val); \
1305 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1306 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1307 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1308 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1309 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1310 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1312 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1313 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1314 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1315 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1316 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1317 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1319 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1320 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1322 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1324 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1326 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1328 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1330 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1331 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1333 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1335 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1337 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1340 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1342 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1345 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1347 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1350 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1351 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1352 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1353 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1354 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1355 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1356 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1357 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1358 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1359 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1360 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1362 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1364 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1367 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1368 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1369 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1371 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1373 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1375 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1377 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1378 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1380 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1382 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1383 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1385 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1388 unsigned long offset = (unsigned long)c;
1389 offset += offsetof(struct btrfs_chunk, stripe);
1390 offset += nr * sizeof(struct btrfs_stripe);
1391 return (struct btrfs_stripe *)offset;
1394 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1396 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1399 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1400 struct btrfs_chunk *c, int nr)
1402 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1405 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1406 struct btrfs_chunk *c, int nr,
1409 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1412 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1413 struct btrfs_chunk *c, int nr)
1415 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1418 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1419 struct btrfs_chunk *c, int nr,
1422 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1425 /* struct btrfs_block_group_item */
1426 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1428 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1430 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1431 struct btrfs_block_group_item, chunk_objectid, 64);
1433 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1434 struct btrfs_block_group_item, chunk_objectid, 64);
1435 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1436 struct btrfs_block_group_item, flags, 64);
1437 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1438 struct btrfs_block_group_item, flags, 64);
1440 /* struct btrfs_inode_ref */
1441 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1442 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1444 /* struct btrfs_inode_item */
1445 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1446 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1447 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1448 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1449 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1450 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1451 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1452 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1453 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1454 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1455 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1456 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1458 static inline struct btrfs_timespec *
1459 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1461 unsigned long ptr = (unsigned long)inode_item;
1462 ptr += offsetof(struct btrfs_inode_item, atime);
1463 return (struct btrfs_timespec *)ptr;
1466 static inline struct btrfs_timespec *
1467 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1469 unsigned long ptr = (unsigned long)inode_item;
1470 ptr += offsetof(struct btrfs_inode_item, mtime);
1471 return (struct btrfs_timespec *)ptr;
1474 static inline struct btrfs_timespec *
1475 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1477 unsigned long ptr = (unsigned long)inode_item;
1478 ptr += offsetof(struct btrfs_inode_item, ctime);
1479 return (struct btrfs_timespec *)ptr;
1482 static inline struct btrfs_timespec *
1483 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1485 unsigned long ptr = (unsigned long)inode_item;
1486 ptr += offsetof(struct btrfs_inode_item, otime);
1487 return (struct btrfs_timespec *)ptr;
1490 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1491 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1493 /* struct btrfs_dev_extent */
1494 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1496 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1497 chunk_objectid, 64);
1498 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1500 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1502 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1504 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1505 return (u8 *)((unsigned long)dev + ptr);
1508 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1509 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1511 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1513 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1516 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1518 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1519 struct btrfs_tree_block_info *item,
1520 struct btrfs_disk_key *key)
1522 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1525 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1526 struct btrfs_tree_block_info *item,
1527 struct btrfs_disk_key *key)
1529 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1532 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1534 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1536 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1538 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1541 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1544 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1546 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1549 static inline u32 btrfs_extent_inline_ref_size(int type)
1551 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1552 type == BTRFS_SHARED_BLOCK_REF_KEY)
1553 return sizeof(struct btrfs_extent_inline_ref);
1554 if (type == BTRFS_SHARED_DATA_REF_KEY)
1555 return sizeof(struct btrfs_shared_data_ref) +
1556 sizeof(struct btrfs_extent_inline_ref);
1557 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1558 return sizeof(struct btrfs_extent_data_ref) +
1559 offsetof(struct btrfs_extent_inline_ref, offset);
1564 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1565 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1567 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1568 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1570 /* struct btrfs_node */
1571 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1572 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1574 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1577 ptr = offsetof(struct btrfs_node, ptrs) +
1578 sizeof(struct btrfs_key_ptr) * nr;
1579 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1582 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1586 ptr = offsetof(struct btrfs_node, ptrs) +
1587 sizeof(struct btrfs_key_ptr) * nr;
1588 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1591 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1594 ptr = offsetof(struct btrfs_node, ptrs) +
1595 sizeof(struct btrfs_key_ptr) * nr;
1596 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1599 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1603 ptr = offsetof(struct btrfs_node, ptrs) +
1604 sizeof(struct btrfs_key_ptr) * nr;
1605 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1608 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1610 return offsetof(struct btrfs_node, ptrs) +
1611 sizeof(struct btrfs_key_ptr) * nr;
1614 void btrfs_node_key(struct extent_buffer *eb,
1615 struct btrfs_disk_key *disk_key, int nr);
1617 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1618 struct btrfs_disk_key *disk_key, int nr)
1621 ptr = btrfs_node_key_ptr_offset(nr);
1622 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1623 struct btrfs_key_ptr, key, disk_key);
1626 /* struct btrfs_item */
1627 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1628 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1630 static inline unsigned long btrfs_item_nr_offset(int nr)
1632 return offsetof(struct btrfs_leaf, items) +
1633 sizeof(struct btrfs_item) * nr;
1636 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1639 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1642 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1643 struct btrfs_item *item)
1645 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1648 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1650 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1653 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1655 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1658 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1660 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1663 static inline void btrfs_item_key(struct extent_buffer *eb,
1664 struct btrfs_disk_key *disk_key, int nr)
1666 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1667 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1670 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1671 struct btrfs_disk_key *disk_key, int nr)
1673 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1674 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1677 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1680 * struct btrfs_root_ref
1682 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1683 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1684 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1686 /* struct btrfs_dir_item */
1687 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1688 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1689 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1690 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1692 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1693 struct btrfs_dir_item *item,
1694 struct btrfs_disk_key *key)
1696 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1699 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1700 struct btrfs_dir_item *item,
1701 struct btrfs_disk_key *key)
1703 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1706 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1708 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1710 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1713 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1714 struct btrfs_free_space_header *h,
1715 struct btrfs_disk_key *key)
1717 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1720 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1721 struct btrfs_free_space_header *h,
1722 struct btrfs_disk_key *key)
1724 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1727 /* struct btrfs_disk_key */
1728 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1730 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1731 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1733 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1734 struct btrfs_disk_key *disk)
1736 cpu->offset = le64_to_cpu(disk->offset);
1737 cpu->type = disk->type;
1738 cpu->objectid = le64_to_cpu(disk->objectid);
1741 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1742 struct btrfs_key *cpu)
1744 disk->offset = cpu_to_le64(cpu->offset);
1745 disk->type = cpu->type;
1746 disk->objectid = cpu_to_le64(cpu->objectid);
1749 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1750 struct btrfs_key *key, int nr)
1752 struct btrfs_disk_key disk_key;
1753 btrfs_node_key(eb, &disk_key, nr);
1754 btrfs_disk_key_to_cpu(key, &disk_key);
1757 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1758 struct btrfs_key *key, int nr)
1760 struct btrfs_disk_key disk_key;
1761 btrfs_item_key(eb, &disk_key, nr);
1762 btrfs_disk_key_to_cpu(key, &disk_key);
1765 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1766 struct btrfs_dir_item *item,
1767 struct btrfs_key *key)
1769 struct btrfs_disk_key disk_key;
1770 btrfs_dir_item_key(eb, item, &disk_key);
1771 btrfs_disk_key_to_cpu(key, &disk_key);
1775 static inline u8 btrfs_key_type(struct btrfs_key *key)
1780 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1785 /* struct btrfs_header */
1786 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1787 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1789 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1790 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1791 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1792 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1794 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1796 return (btrfs_header_flags(eb) & flag) == flag;
1799 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1801 u64 flags = btrfs_header_flags(eb);
1802 btrfs_set_header_flags(eb, flags | flag);
1803 return (flags & flag) == flag;
1806 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1808 u64 flags = btrfs_header_flags(eb);
1809 btrfs_set_header_flags(eb, flags & ~flag);
1810 return (flags & flag) == flag;
1813 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1815 u64 flags = btrfs_header_flags(eb);
1816 return flags >> BTRFS_BACKREF_REV_SHIFT;
1819 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1822 u64 flags = btrfs_header_flags(eb);
1823 flags &= ~BTRFS_BACKREF_REV_MASK;
1824 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1825 btrfs_set_header_flags(eb, flags);
1828 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1830 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1834 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1836 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1840 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1842 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1846 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1848 unsigned long ptr = offsetof(struct btrfs_header, csum);
1852 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1857 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1862 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1867 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1869 return btrfs_header_level(eb) == 0;
1872 /* struct btrfs_root_item */
1873 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1875 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1876 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1877 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1879 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1881 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1882 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1883 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1884 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1885 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1886 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1887 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1888 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1891 /* struct btrfs_super_block */
1893 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1894 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1895 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1897 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1898 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1899 struct btrfs_super_block, sys_chunk_array_size, 32);
1900 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1901 struct btrfs_super_block, chunk_root_generation, 64);
1902 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1904 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1906 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1907 chunk_root_level, 8);
1908 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1910 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1911 log_root_transid, 64);
1912 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1914 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1916 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1918 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1920 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1922 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1924 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1926 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1927 root_dir_objectid, 64);
1928 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1930 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1932 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1933 compat_ro_flags, 64);
1934 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1935 incompat_flags, 64);
1936 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1938 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
1939 cache_generation, 64);
1941 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1943 int t = btrfs_super_csum_type(s);
1944 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1945 return btrfs_csum_sizes[t];
1948 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1950 return offsetof(struct btrfs_leaf, items);
1953 /* struct btrfs_file_extent_item */
1954 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1956 static inline unsigned long
1957 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
1959 unsigned long offset = (unsigned long)e;
1960 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1964 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1966 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1969 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1971 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1973 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1974 disk_num_bytes, 64);
1975 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1977 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1979 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1981 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1983 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1985 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1986 other_encoding, 16);
1988 /* this returns the number of file bytes represented by the inline item.
1989 * If an item is compressed, this is the uncompressed size
1991 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1992 struct btrfs_file_extent_item *e)
1994 return btrfs_file_extent_ram_bytes(eb, e);
1998 * this returns the number of bytes used by the item on disk, minus the
1999 * size of any extent headers. If a file is compressed on disk, this is
2000 * the compressed size
2002 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2003 struct btrfs_item *e)
2005 unsigned long offset;
2006 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2007 return btrfs_item_size(eb, e) - offset;
2010 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
2012 return sb->s_fs_info;
2015 static inline int btrfs_set_root_name(struct btrfs_root *root,
2016 const char *name, int len)
2018 /* if we already have a name just free it */
2021 root->name = kmalloc(len+1, GFP_KERNEL);
2025 memcpy(root->name, name, len);
2026 root->name[len] = '\0';
2031 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
2034 return root->leafsize;
2035 return root->nodesize;
2038 /* helper function to cast into the data area of the leaf. */
2039 #define btrfs_item_ptr(leaf, slot, type) \
2040 ((type *)(btrfs_leaf_data(leaf) + \
2041 btrfs_item_offset_nr(leaf, slot)))
2043 #define btrfs_item_ptr_offset(leaf, slot) \
2044 ((unsigned long)(btrfs_leaf_data(leaf) + \
2045 btrfs_item_offset_nr(leaf, slot)))
2047 static inline struct dentry *fdentry(struct file *file)
2049 return file->f_path.dentry;
2052 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2054 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2055 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2059 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2060 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2061 struct btrfs_root *root, unsigned long count);
2062 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
2063 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2064 struct btrfs_root *root, u64 bytenr,
2065 u64 num_bytes, u64 *refs, u64 *flags);
2066 int btrfs_pin_extent(struct btrfs_root *root,
2067 u64 bytenr, u64 num, int reserved);
2068 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
2069 struct btrfs_root *root, struct extent_buffer *leaf);
2070 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
2071 struct btrfs_root *root,
2072 u64 objectid, u64 offset, u64 bytenr);
2073 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
2074 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2075 struct btrfs_fs_info *info,
2077 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2078 u64 btrfs_find_block_group(struct btrfs_root *root,
2079 u64 search_start, u64 search_hint, int owner);
2080 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2081 struct btrfs_root *root, u32 blocksize,
2082 u64 parent, u64 root_objectid,
2083 struct btrfs_disk_key *key, int level,
2084 u64 hint, u64 empty_size);
2085 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2086 struct btrfs_root *root,
2087 struct extent_buffer *buf,
2088 u64 parent, int last_ref);
2089 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
2090 struct btrfs_root *root,
2091 u64 bytenr, u32 blocksize,
2093 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2094 struct btrfs_root *root,
2095 u64 root_objectid, u64 owner,
2096 u64 offset, struct btrfs_key *ins);
2097 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2098 struct btrfs_root *root,
2099 u64 root_objectid, u64 owner, u64 offset,
2100 struct btrfs_key *ins);
2101 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2102 struct btrfs_root *root,
2103 u64 num_bytes, u64 min_alloc_size,
2104 u64 empty_size, u64 hint_byte,
2105 u64 search_end, struct btrfs_key *ins,
2107 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2108 struct extent_buffer *buf, int full_backref);
2109 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2110 struct extent_buffer *buf, int full_backref);
2111 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2112 struct btrfs_root *root,
2113 u64 bytenr, u64 num_bytes, u64 flags,
2115 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2116 struct btrfs_root *root,
2117 u64 bytenr, u64 num_bytes, u64 parent,
2118 u64 root_objectid, u64 owner, u64 offset);
2120 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2121 int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2122 struct btrfs_root *root);
2123 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2124 struct btrfs_root *root);
2125 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2126 struct btrfs_root *root,
2127 u64 bytenr, u64 num_bytes, u64 parent,
2128 u64 root_objectid, u64 owner, u64 offset);
2130 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2131 struct btrfs_root *root);
2132 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
2133 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2134 int btrfs_read_block_groups(struct btrfs_root *root);
2135 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
2136 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2137 struct btrfs_root *root, u64 bytes_used,
2138 u64 type, u64 chunk_objectid, u64 chunk_offset,
2140 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2141 struct btrfs_root *root, u64 group_start);
2142 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2143 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
2144 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2145 int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
2146 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
2147 int btrfs_trans_reserve_metadata(struct btrfs_trans_handle *trans,
2148 struct btrfs_root *root,
2149 int num_items, int *retries);
2150 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
2151 struct btrfs_root *root);
2152 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
2153 struct inode *inode);
2154 void btrfs_orphan_release_metadata(struct inode *inode);
2155 int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
2156 struct btrfs_pending_snapshot *pending);
2157 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
2158 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
2159 int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
2160 void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
2161 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv);
2162 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root);
2163 void btrfs_free_block_rsv(struct btrfs_root *root,
2164 struct btrfs_block_rsv *rsv);
2165 void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info,
2166 struct btrfs_block_rsv *rsv);
2167 int btrfs_block_rsv_add(struct btrfs_trans_handle *trans,
2168 struct btrfs_root *root,
2169 struct btrfs_block_rsv *block_rsv,
2170 u64 num_bytes, int *retries);
2171 int btrfs_block_rsv_check(struct btrfs_trans_handle *trans,
2172 struct btrfs_root *root,
2173 struct btrfs_block_rsv *block_rsv,
2174 u64 min_reserved, int min_factor);
2175 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2176 struct btrfs_block_rsv *dst_rsv,
2178 void btrfs_block_rsv_release(struct btrfs_root *root,
2179 struct btrfs_block_rsv *block_rsv,
2181 int btrfs_set_block_group_ro(struct btrfs_root *root,
2182 struct btrfs_block_group_cache *cache);
2183 int btrfs_set_block_group_rw(struct btrfs_root *root,
2184 struct btrfs_block_group_cache *cache);
2185 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2187 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2188 int level, int *slot);
2189 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2190 int btrfs_previous_item(struct btrfs_root *root,
2191 struct btrfs_path *path, u64 min_objectid,
2193 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2194 struct btrfs_root *root, struct btrfs_path *path,
2195 struct btrfs_key *new_key);
2196 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2197 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2198 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2199 struct btrfs_key *key, int lowest_level,
2200 int cache_only, u64 min_trans);
2201 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2202 struct btrfs_key *max_key,
2203 struct btrfs_path *path, int cache_only,
2205 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2206 struct btrfs_root *root, struct extent_buffer *buf,
2207 struct extent_buffer *parent, int parent_slot,
2208 struct extent_buffer **cow_ret);
2209 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2210 struct btrfs_root *root,
2211 struct extent_buffer *buf,
2212 struct extent_buffer **cow_ret, u64 new_root_objectid);
2213 int btrfs_block_can_be_shared(struct btrfs_root *root,
2214 struct extent_buffer *buf);
2215 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2216 *root, struct btrfs_path *path, u32 data_size);
2217 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2218 struct btrfs_root *root,
2219 struct btrfs_path *path,
2220 u32 new_size, int from_end);
2221 int btrfs_split_item(struct btrfs_trans_handle *trans,
2222 struct btrfs_root *root,
2223 struct btrfs_path *path,
2224 struct btrfs_key *new_key,
2225 unsigned long split_offset);
2226 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2227 struct btrfs_root *root,
2228 struct btrfs_path *path,
2229 struct btrfs_key *new_key);
2230 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2231 *root, struct btrfs_key *key, struct btrfs_path *p, int
2233 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2234 struct btrfs_root *root, struct extent_buffer *parent,
2235 int start_slot, int cache_only, u64 *last_ret,
2236 struct btrfs_key *progress);
2237 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2238 struct btrfs_path *btrfs_alloc_path(void);
2239 void btrfs_free_path(struct btrfs_path *p);
2240 void btrfs_set_path_blocking(struct btrfs_path *p);
2241 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2243 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2244 struct btrfs_path *path, int slot, int nr);
2245 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2246 struct btrfs_root *root,
2247 struct btrfs_path *path)
2249 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2252 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2253 *root, struct btrfs_key *key, void *data, u32 data_size);
2254 int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
2255 struct btrfs_root *root,
2256 struct btrfs_path *path,
2257 struct btrfs_key *cpu_key, u32 *data_size,
2259 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2260 struct btrfs_root *root,
2261 struct btrfs_path *path,
2262 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2264 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2265 struct btrfs_root *root,
2266 struct btrfs_path *path,
2267 struct btrfs_key *key,
2270 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2273 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2274 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2275 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2276 int btrfs_drop_snapshot(struct btrfs_root *root,
2277 struct btrfs_block_rsv *block_rsv, int update_ref);
2278 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2279 struct btrfs_root *root,
2280 struct extent_buffer *node,
2281 struct extent_buffer *parent);
2283 int btrfs_find_root_ref(struct btrfs_root *tree_root,
2284 struct btrfs_path *path,
2285 u64 root_id, u64 ref_id);
2286 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2287 struct btrfs_root *tree_root,
2288 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2289 const char *name, int name_len);
2290 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2291 struct btrfs_root *tree_root,
2292 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2293 const char *name, int name_len);
2294 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2295 struct btrfs_key *key);
2296 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2297 *root, struct btrfs_key *key, struct btrfs_root_item
2299 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2300 *root, struct btrfs_key *key, struct btrfs_root_item
2302 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2303 btrfs_root_item *item, struct btrfs_key *key);
2304 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
2305 u64 *found_objectid);
2306 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2307 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
2308 int btrfs_set_root_node(struct btrfs_root_item *item,
2309 struct extent_buffer *node);
2311 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2312 struct btrfs_root *root, const char *name,
2313 int name_len, u64 dir,
2314 struct btrfs_key *location, u8 type, u64 index);
2315 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2316 struct btrfs_root *root,
2317 struct btrfs_path *path, u64 dir,
2318 const char *name, int name_len,
2320 struct btrfs_dir_item *
2321 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2322 struct btrfs_root *root,
2323 struct btrfs_path *path, u64 dir,
2324 u64 objectid, const char *name, int name_len,
2326 struct btrfs_dir_item *
2327 btrfs_search_dir_index_item(struct btrfs_root *root,
2328 struct btrfs_path *path, u64 dirid,
2329 const char *name, int name_len);
2330 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2331 struct btrfs_path *path,
2332 const char *name, int name_len);
2333 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2334 struct btrfs_root *root,
2335 struct btrfs_path *path,
2336 struct btrfs_dir_item *di);
2337 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2338 struct btrfs_root *root,
2339 struct btrfs_path *path, u64 objectid,
2340 const char *name, u16 name_len,
2341 const void *data, u16 data_len);
2342 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2343 struct btrfs_root *root,
2344 struct btrfs_path *path, u64 dir,
2345 const char *name, u16 name_len,
2349 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2350 struct btrfs_root *root, u64 offset);
2351 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2352 struct btrfs_root *root, u64 offset);
2353 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
2356 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2357 struct btrfs_root *fs_root,
2358 u64 dirid, u64 *objectid);
2359 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2362 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2363 struct btrfs_root *root,
2364 const char *name, int name_len,
2365 u64 inode_objectid, u64 ref_objectid, u64 index);
2366 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2367 struct btrfs_root *root,
2368 const char *name, int name_len,
2369 u64 inode_objectid, u64 ref_objectid, u64 *index);
2370 struct btrfs_inode_ref *
2371 btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
2372 struct btrfs_root *root,
2373 struct btrfs_path *path,
2374 const char *name, int name_len,
2375 u64 inode_objectid, u64 ref_objectid, int mod);
2376 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2377 struct btrfs_root *root,
2378 struct btrfs_path *path, u64 objectid);
2379 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2380 *root, struct btrfs_path *path,
2381 struct btrfs_key *location, int mod);
2384 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2385 struct btrfs_root *root, u64 bytenr, u64 len);
2386 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2387 struct bio *bio, u32 *dst);
2388 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
2389 struct bio *bio, u64 logical_offset, u32 *dst);
2390 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2391 struct btrfs_root *root,
2392 u64 objectid, u64 pos,
2393 u64 disk_offset, u64 disk_num_bytes,
2394 u64 num_bytes, u64 offset, u64 ram_bytes,
2395 u8 compression, u8 encryption, u16 other_encoding);
2396 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2397 struct btrfs_root *root,
2398 struct btrfs_path *path, u64 objectid,
2399 u64 bytenr, int mod);
2400 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2401 struct btrfs_root *root,
2402 struct btrfs_ordered_sum *sums);
2403 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2404 struct bio *bio, u64 file_start, int contig);
2405 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
2406 u64 start, unsigned long len);
2407 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2408 struct btrfs_root *root,
2409 struct btrfs_path *path,
2410 u64 bytenr, int cow);
2411 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2412 struct btrfs_root *root, struct btrfs_path *path,
2414 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
2415 u64 end, struct list_head *list);
2418 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2419 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2420 #define ClearPageChecked ClearPageFsMisc
2421 #define SetPageChecked SetPageFsMisc
2422 #define PageChecked PageFsMisc
2425 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2426 int btrfs_set_inode_index(struct inode *dir, u64 *index);
2427 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2428 struct btrfs_root *root,
2429 struct inode *dir, struct inode *inode,
2430 const char *name, int name_len);
2431 int btrfs_add_link(struct btrfs_trans_handle *trans,
2432 struct inode *parent_inode, struct inode *inode,
2433 const char *name, int name_len, int add_backref, u64 index);
2434 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
2435 struct btrfs_root *root,
2436 struct inode *dir, u64 objectid,
2437 const char *name, int name_len);
2438 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2439 struct btrfs_root *root,
2440 struct inode *inode, u64 new_size,
2443 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
2444 int btrfs_start_one_delalloc_inode(struct btrfs_root *root, int delay_iput);
2445 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
2446 struct extent_state **cached_state);
2447 int btrfs_writepages(struct address_space *mapping,
2448 struct writeback_control *wbc);
2449 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2450 struct btrfs_root *new_root,
2451 u64 new_dirid, u64 alloc_hint);
2452 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2453 size_t size, struct bio *bio, unsigned long bio_flags);
2455 unsigned long btrfs_force_ra(struct address_space *mapping,
2456 struct file_ra_state *ra, struct file *file,
2457 pgoff_t offset, pgoff_t last_index);
2458 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2459 int btrfs_readpage(struct file *file, struct page *page);
2460 void btrfs_evict_inode(struct inode *inode);
2461 void btrfs_put_inode(struct inode *inode);
2462 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
2463 void btrfs_dirty_inode(struct inode *inode);
2464 struct inode *btrfs_alloc_inode(struct super_block *sb);
2465 void btrfs_destroy_inode(struct inode *inode);
2466 int btrfs_drop_inode(struct inode *inode);
2467 int btrfs_init_cachep(void);
2468 void btrfs_destroy_cachep(void);
2469 long btrfs_ioctl_trans_end(struct file *file);
2470 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2471 struct btrfs_root *root, int *was_new);
2472 int btrfs_commit_write(struct file *file, struct page *page,
2473 unsigned from, unsigned to);
2474 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2475 size_t page_offset, u64 start, u64 end,
2477 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2478 struct btrfs_root *root,
2479 struct inode *inode);
2480 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2481 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2482 void btrfs_orphan_cleanup(struct btrfs_root *root);
2483 void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans,
2484 struct btrfs_pending_snapshot *pending,
2485 u64 *bytes_to_reserve);
2486 void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans,
2487 struct btrfs_pending_snapshot *pending);
2488 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
2489 struct btrfs_root *root);
2490 int btrfs_cont_expand(struct inode *inode, loff_t size);
2491 int btrfs_invalidate_inodes(struct btrfs_root *root);
2492 void btrfs_add_delayed_iput(struct inode *inode);
2493 void btrfs_run_delayed_iputs(struct btrfs_root *root);
2494 int btrfs_prealloc_file_range(struct inode *inode, int mode,
2495 u64 start, u64 num_bytes, u64 min_size,
2496 loff_t actual_len, u64 *alloc_hint);
2497 int btrfs_prealloc_file_range_trans(struct inode *inode,
2498 struct btrfs_trans_handle *trans, int mode,
2499 u64 start, u64 num_bytes, u64 min_size,
2500 loff_t actual_len, u64 *alloc_hint);
2501 extern const struct dentry_operations btrfs_dentry_operations;
2504 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2505 void btrfs_update_iflags(struct inode *inode);
2506 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
2509 int btrfs_sync_file(struct file *file, int datasync);
2510 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2512 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
2513 extern const struct file_operations btrfs_file_operations;
2514 int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
2515 u64 start, u64 end, u64 *hint_byte, int drop_cache);
2516 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2517 struct inode *inode, u64 start, u64 end);
2518 int btrfs_release_file(struct inode *inode, struct file *file);
2521 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2522 struct btrfs_root *root, int cache_only);
2525 int btrfs_init_sysfs(void);
2526 void btrfs_exit_sysfs(void);
2527 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2528 int btrfs_sysfs_add_root(struct btrfs_root *root);
2529 void btrfs_sysfs_del_root(struct btrfs_root *root);
2530 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2533 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2536 int btrfs_parse_options(struct btrfs_root *root, char *options);
2537 int btrfs_sync_fs(struct super_block *sb, int wait);
2540 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
2541 int btrfs_check_acl(struct inode *inode, int mask);
2543 #define btrfs_check_acl NULL
2545 int btrfs_init_acl(struct btrfs_trans_handle *trans,
2546 struct inode *inode, struct inode *dir);
2547 int btrfs_acl_chmod(struct inode *inode);
2550 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
2551 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
2552 struct btrfs_root *root);
2553 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
2554 struct btrfs_root *root);
2555 int btrfs_recover_relocation(struct btrfs_root *root);
2556 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
2557 void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
2558 struct btrfs_root *root, struct extent_buffer *buf,
2559 struct extent_buffer *cow);
2560 void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
2561 struct btrfs_pending_snapshot *pending,
2562 u64 *bytes_to_reserve);
2563 void btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
2564 struct btrfs_pending_snapshot *pending);