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.
23 #include "kerncompat.h"
24 #include "radix-tree.h"
25 #include "extent-cache.h"
26 #include "extent_io.h"
29 struct btrfs_trans_handle;
30 #define BTRFS_MAGIC "_BHRfS_M"
32 #define BTRFS_MAX_LEVEL 8
34 #define BTRFS_COMPAT_EXTENT_TREE_V0
36 /* holds pointers to all of the tree roots */
37 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
39 /* stores information about which extents are in use, and reference counts */
40 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
43 * chunk tree stores translations from logical -> physical block numbering
44 * the super block points to the chunk tree
46 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
49 * stores information about which areas of a given device are in use.
50 * one per device. The tree of tree roots points to the device tree
52 #define BTRFS_DEV_TREE_OBJECTID 4ULL
54 /* one per subvolume, storing files and directories */
55 #define BTRFS_FS_TREE_OBJECTID 5ULL
57 /* directory objectid inside the root tree */
58 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
59 /* holds checksums of all the data extents */
60 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
63 /* oprhan objectid for tracking unlinked/truncated files */
64 #define BTRFS_ORPHAN_OBJECTID -5ULL
66 /* does write ahead logging to speed up fsyncs */
67 #define BTRFS_TREE_LOG_OBJECTID -6ULL
68 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
71 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
72 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
75 * extent checksums all have this objectid
76 * this allows them to share the logging tree
79 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
81 /* dummy objectid represents multiple objectids */
82 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
85 * All files have objectids in this range.
87 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
88 #define BTRFS_LAST_FREE_OBJECTID -256ULL
89 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
94 * the device items go into the chunk tree. The key is in the form
95 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
97 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
100 * we can actually store much bigger names, but lets not confuse the rest
103 #define BTRFS_NAME_LEN 255
105 /* 32 bytes in various csum fields */
106 #define BTRFS_CSUM_SIZE 32
109 #define BTRFS_CSUM_TYPE_CRC32 0
113 #define BTRFS_CSUM_TYPE_CRC32 0
115 static int btrfs_csum_sizes[] = { 4, 0 };
117 /* four bytes for CRC32 */
118 #define BTRFS_CRC32_SIZE 4
119 #define BTRFS_EMPTY_DIR_SIZE 0
121 #define BTRFS_FT_UNKNOWN 0
122 #define BTRFS_FT_REG_FILE 1
123 #define BTRFS_FT_DIR 2
124 #define BTRFS_FT_CHRDEV 3
125 #define BTRFS_FT_BLKDEV 4
126 #define BTRFS_FT_FIFO 5
127 #define BTRFS_FT_SOCK 6
128 #define BTRFS_FT_SYMLINK 7
129 #define BTRFS_FT_XATTR 8
130 #define BTRFS_FT_MAX 9
133 * the key defines the order in the tree, and so it also defines (optimal)
134 * block layout. objectid corresonds to the inode number. The flags
135 * tells us things about the object, and is a kind of stream selector.
136 * so for a given inode, keys with flags of 1 might refer to the inode
137 * data, flags of 2 may point to file data in the btree and flags == 3
138 * may point to extents.
140 * offset is the starting byte offset for this key in the stream.
142 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
143 * in cpu native order. Otherwise they are identical and their sizes
144 * should be the same (ie both packed)
146 struct btrfs_disk_key {
150 } __attribute__ ((__packed__));
156 } __attribute__ ((__packed__));
158 struct btrfs_mapping_tree {
159 struct cache_tree cache_tree;
162 #define BTRFS_UUID_SIZE 16
163 struct btrfs_dev_item {
164 /* the internal btrfs device id */
167 /* size of the device */
173 /* optimal io alignment for this device */
176 /* optimal io width for this device */
179 /* minimal io size for this device */
182 /* type and info about this device */
185 /* expected generation for this device */
189 * starting byte of this partition on the device,
190 * to allowr for stripe alignment in the future
194 /* grouping information for allocation decisions */
197 /* seek speed 0-100 where 100 is fastest */
200 /* bandwidth 0-100 where 100 is fastest */
203 /* btrfs generated uuid for this device */
204 u8 uuid[BTRFS_UUID_SIZE];
206 /* uuid of FS who owns this device */
207 u8 fsid[BTRFS_UUID_SIZE];
208 } __attribute__ ((__packed__));
210 struct btrfs_stripe {
213 u8 dev_uuid[BTRFS_UUID_SIZE];
214 } __attribute__ ((__packed__));
217 /* size of this chunk in bytes */
220 /* objectid of the root referencing this chunk */
226 /* optimal io alignment for this chunk */
229 /* optimal io width for this chunk */
232 /* minimal io size for this chunk */
235 /* 2^16 stripes is quite a lot, a second limit is the size of a single
240 /* sub stripes only matter for raid10 */
242 struct btrfs_stripe stripe;
243 /* additional stripes go here */
244 } __attribute__ ((__packed__));
246 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
248 BUG_ON(num_stripes == 0);
249 return sizeof(struct btrfs_chunk) +
250 sizeof(struct btrfs_stripe) * (num_stripes - 1);
253 #define BTRFS_FSID_SIZE 16
254 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
255 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
256 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
257 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
259 #define BTRFS_BACKREF_REV_MAX 256
260 #define BTRFS_BACKREF_REV_SHIFT 56
261 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
262 BTRFS_BACKREF_REV_SHIFT)
264 #define BTRFS_OLD_BACKREF_REV 0
265 #define BTRFS_MIXED_BACKREF_REV 1
268 * every tree block (leaf or node) starts with this header.
270 struct btrfs_header {
271 /* these first four must match the super block */
272 u8 csum[BTRFS_CSUM_SIZE];
273 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
274 __le64 bytenr; /* which block this node is supposed to live in */
277 /* allowed to be different from the super from here on down */
278 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
283 } __attribute__ ((__packed__));
285 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
286 sizeof(struct btrfs_header)) / \
287 sizeof(struct btrfs_key_ptr))
288 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
289 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
290 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
291 sizeof(struct btrfs_item) - \
292 sizeof(struct btrfs_file_extent_item))
296 * this is a very generous portion of the super block, giving us
297 * room to translate 14 chunks with 3 stripes each.
299 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
300 #define BTRFS_LABEL_SIZE 256
303 * the super block basically lists the main trees of the FS
304 * it currently lacks any block count etc etc
306 struct btrfs_super_block {
307 u8 csum[BTRFS_CSUM_SIZE];
308 /* the first 3 fields must match struct btrfs_header */
309 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
310 __le64 bytenr; /* this block number */
313 /* allowed to be different from the btrfs_header from here own down */
320 /* this will help find the new super based on the log root */
321 __le64 log_root_transid;
324 __le64 root_dir_objectid;
330 __le32 sys_chunk_array_size;
331 __le64 chunk_root_generation;
333 __le64 compat_ro_flags;
334 __le64 incompat_flags;
339 struct btrfs_dev_item dev_item;
341 char label[BTRFS_LABEL_SIZE];
343 __le64 cache_generation;
345 /* future expansion */
347 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
348 } __attribute__ ((__packed__));
351 * Compat flags that we support. If any incompat flags are set other than the
352 * ones specified below then we will fail to mount
354 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
355 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
356 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
357 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
359 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
360 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
361 #define BTRFS_FEATURE_INCOMPAT_SUPP \
362 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
363 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
364 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
365 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
368 * A leaf is full of items. offset and size tell us where to find
369 * the item in the leaf (relative to the start of the data area)
372 struct btrfs_disk_key key;
375 } __attribute__ ((__packed__));
378 * leaves have an item area and a data area:
379 * [item0, item1....itemN] [free space] [dataN...data1, data0]
381 * The data is separate from the items to get the keys closer together
385 struct btrfs_header header;
386 struct btrfs_item items[];
387 } __attribute__ ((__packed__));
390 * all non-leaf blocks are nodes, they hold only keys and pointers to
393 struct btrfs_key_ptr {
394 struct btrfs_disk_key key;
397 } __attribute__ ((__packed__));
400 struct btrfs_header header;
401 struct btrfs_key_ptr ptrs[];
402 } __attribute__ ((__packed__));
405 * btrfs_paths remember the path taken from the root down to the leaf.
406 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
407 * to any other levels that are present.
409 * The slots array records the index of the item or block pointer
410 * used while walking the tree.
414 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
415 int slots[BTRFS_MAX_LEVEL];
416 /* if there is real range locking, this locks field will change */
417 int locks[BTRFS_MAX_LEVEL];
419 /* keep some upper locks as we walk down */
423 * set by btrfs_split_item, tells search_slot to keep all locks
424 * and to force calls to keep space in the nodes
426 unsigned int search_for_split:1;
427 unsigned int keep_locks:1;
428 unsigned int skip_locking:1;
429 unsigned int leave_spinning:1;
433 * items in the extent btree are used to record the objectid of the
434 * owner of the block and the number of references
437 struct btrfs_extent_item {
441 } __attribute__ ((__packed__));
443 struct btrfs_extent_item_v0 {
445 } __attribute__ ((__packed__));
447 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
448 sizeof(struct btrfs_item))
450 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
451 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
453 /* following flags only apply to tree blocks */
455 /* use full backrefs for extent pointers in the block*/
456 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
458 struct btrfs_tree_block_info {
459 struct btrfs_disk_key key;
461 } __attribute__ ((__packed__));
463 struct btrfs_extent_data_ref {
468 } __attribute__ ((__packed__));
470 struct btrfs_shared_data_ref {
472 } __attribute__ ((__packed__));
474 struct btrfs_extent_inline_ref {
477 } __attribute__ ((__packed__));
479 struct btrfs_extent_ref_v0 {
484 } __attribute__ ((__packed__));
486 /* dev extents record free space on individual devices. The owner
487 * field points back to the chunk allocation mapping tree that allocated
488 * the extent. The chunk tree uuid field is a way to double check the owner
490 struct btrfs_dev_extent {
492 __le64 chunk_objectid;
495 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
496 } __attribute__ ((__packed__));
498 struct btrfs_inode_ref {
502 } __attribute__ ((__packed__));
504 struct btrfs_timespec {
507 } __attribute__ ((__packed__));
510 BTRFS_COMPRESS_NONE = 0,
511 BTRFS_COMPRESS_ZLIB = 1,
512 BTRFS_COMPRESS_LZO = 2,
513 BTRFS_COMPRESS_TYPES = 2,
514 BTRFS_COMPRESS_LAST = 3,
515 } btrfs_compression_type;
517 /* we don't understand any encryption methods right now */
519 BTRFS_ENCRYPTION_NONE = 0,
520 BTRFS_ENCRYPTION_LAST = 1,
521 } btrfs_encryption_type;
523 struct btrfs_inode_item {
524 /* nfs style generation number */
526 /* transid that last touched this inode */
538 /* modification sequence number for NFS */
542 * a little future expansion, for more than this we can
543 * just grow the inode item and version it
546 struct btrfs_timespec atime;
547 struct btrfs_timespec ctime;
548 struct btrfs_timespec mtime;
549 struct btrfs_timespec otime;
550 } __attribute__ ((__packed__));
552 struct btrfs_dir_log_item {
554 } __attribute__ ((__packed__));
556 struct btrfs_dir_item {
557 struct btrfs_disk_key location;
562 } __attribute__ ((__packed__));
564 struct btrfs_root_item {
565 struct btrfs_inode_item inode;
571 __le64 last_snapshot;
574 struct btrfs_disk_key drop_progress;
577 } __attribute__ ((__packed__));
580 * this is used for both forward and backward root refs
582 struct btrfs_root_ref {
586 } __attribute__ ((__packed__));
588 #define BTRFS_FILE_EXTENT_INLINE 0
589 #define BTRFS_FILE_EXTENT_REG 1
590 #define BTRFS_FILE_EXTENT_PREALLOC 2
592 struct btrfs_file_extent_item {
594 * transaction id that created this extent
598 * max number of bytes to hold this extent in ram
599 * when we split a compressed extent we can't know how big
600 * each of the resulting pieces will be. So, this is
601 * an upper limit on the size of the extent in ram instead of
607 * 32 bits for the various ways we might encode the data,
608 * including compression and encryption. If any of these
609 * are set to something a given disk format doesn't understand
610 * it is treated like an incompat flag for reading and writing,
615 __le16 other_encoding; /* spare for later use */
617 /* are we inline data or a real extent? */
621 * disk space consumed by the extent, checksum blocks are included
625 __le64 disk_num_bytes;
627 * the logical offset in file blocks (no csums)
628 * this extent record is for. This allows a file extent to point
629 * into the middle of an existing extent on disk, sharing it
630 * between two snapshots (useful if some bytes in the middle of the
631 * extent have changed
635 * the logical number of file blocks (no csums included)
639 } __attribute__ ((__packed__));
641 struct btrfs_csum_item {
643 } __attribute__ ((__packed__));
645 /* tag for the radix tree of block groups in ram */
646 #define BTRFS_BLOCK_GROUP_DATA (1 << 0)
647 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
648 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
649 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
650 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
651 #define BTRFS_BLOCK_GROUP_DUP (1 << 5)
652 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
654 struct btrfs_block_group_item {
656 __le64 chunk_objectid;
658 } __attribute__ ((__packed__));
660 struct btrfs_space_info {
666 struct list_head list;
669 struct btrfs_block_group_cache {
670 struct cache_extent cache;
671 struct btrfs_key key;
672 struct btrfs_block_group_item item;
673 struct btrfs_space_info *space_info;
680 struct btrfs_extent_ops {
681 int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
682 u64 hint_byte, struct btrfs_key *ins);
683 int (*free_extent)(struct btrfs_root *root, u64 bytenr,
688 struct btrfs_fs_devices;
689 struct btrfs_fs_info {
690 u8 fsid[BTRFS_FSID_SIZE];
691 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
692 struct btrfs_root *fs_root;
693 struct btrfs_root *extent_root;
694 struct btrfs_root *tree_root;
695 struct btrfs_root *chunk_root;
696 struct btrfs_root *dev_root;
697 struct btrfs_root *csum_root;
699 struct cache_tree fs_root_cache;
701 /* the log root tree is a directory of all the other log roots */
702 struct btrfs_root *log_root_tree;
704 struct extent_io_tree extent_cache;
705 struct extent_io_tree free_space_cache;
706 struct extent_io_tree block_group_cache;
707 struct extent_io_tree pinned_extents;
708 struct extent_io_tree pending_del;
709 struct extent_io_tree extent_ins;
711 /* logical->physical extent mapping */
712 struct btrfs_mapping_tree mapping_tree;
715 u64 last_trans_committed;
717 u64 avail_data_alloc_bits;
718 u64 avail_metadata_alloc_bits;
719 u64 avail_system_alloc_bits;
720 u64 data_alloc_profile;
721 u64 metadata_alloc_profile;
722 u64 system_alloc_profile;
725 struct btrfs_trans_handle *running_transaction;
726 struct btrfs_super_block super_copy;
727 struct mutex fs_mutex;
732 struct btrfs_extent_ops *extent_ops;
733 struct list_head dirty_cowonly_roots;
735 struct btrfs_fs_devices *fs_devices;
736 struct list_head space_info;
742 * in ram representation of the tree. extent_root is used for all allocations
743 * and for the extent tree extent_root root.
746 struct extent_buffer *node;
747 struct extent_buffer *commit_root;
748 struct btrfs_root_item root_item;
749 struct btrfs_key root_key;
750 struct btrfs_fs_info *fs_info;
754 /* data allocations are done in sectorsize units */
757 /* node allocations are done in nodesize units */
760 /* leaf allocations are done in leafsize units */
763 /* leaf allocations are done in leafsize units */
772 u64 last_inode_alloc;
774 /* the dirty list is only used by non-reference counted roots */
775 struct list_head dirty_list;
776 struct cache_extent cache;
780 * inode items have the data typically returned from stat and store other
781 * info about object characteristics. There is one for every file and dir in
784 #define BTRFS_INODE_ITEM_KEY 1
785 #define BTRFS_INODE_REF_KEY 12
786 #define BTRFS_XATTR_ITEM_KEY 24
787 #define BTRFS_ORPHAN_ITEM_KEY 48
789 #define BTRFS_DIR_LOG_ITEM_KEY 60
790 #define BTRFS_DIR_LOG_INDEX_KEY 72
792 * dir items are the name -> inode pointers in a directory. There is one
793 * for every name in a directory.
795 #define BTRFS_DIR_ITEM_KEY 84
796 #define BTRFS_DIR_INDEX_KEY 96
799 * extent data is for file data
801 #define BTRFS_EXTENT_DATA_KEY 108
804 * csum items have the checksums for data in the extents
806 #define BTRFS_CSUM_ITEM_KEY 120
808 * extent csums are stored in a separate tree and hold csums for
809 * an entire extent on disk.
811 #define BTRFS_EXTENT_CSUM_KEY 128
814 * root items point to tree roots. There are typically in the root
815 * tree used by the super block to find all the other trees
817 #define BTRFS_ROOT_ITEM_KEY 132
820 * root backrefs tie subvols and snapshots to the directory entries that
823 #define BTRFS_ROOT_BACKREF_KEY 144
826 * root refs make a fast index for listing all of the snapshots and
827 * subvolumes referenced by a given root. They point directly to the
828 * directory item in the root that references the subvol
830 #define BTRFS_ROOT_REF_KEY 156
833 * extent items are in the extent map tree. These record which blocks
834 * are used, and how many references there are to each block
836 #define BTRFS_EXTENT_ITEM_KEY 168
838 #define BTRFS_TREE_BLOCK_REF_KEY 176
840 #define BTRFS_EXTENT_DATA_REF_KEY 178
842 /* old style extent backrefs */
843 #define BTRFS_EXTENT_REF_V0_KEY 180
845 #define BTRFS_SHARED_BLOCK_REF_KEY 182
847 #define BTRFS_SHARED_DATA_REF_KEY 184
851 * block groups give us hints into the extent allocation trees. Which
852 * blocks are free etc etc
854 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
856 #define BTRFS_DEV_EXTENT_KEY 204
857 #define BTRFS_DEV_ITEM_KEY 216
858 #define BTRFS_CHUNK_ITEM_KEY 228
861 * string items are for debugging. They just store a short string of
864 #define BTRFS_STRING_ITEM_KEY 253
868 #define BTRFS_INODE_NODATASUM (1 << 0)
869 #define BTRFS_INODE_NODATACOW (1 << 1)
870 #define BTRFS_INODE_READONLY (1 << 2)
872 #define read_eb_member(eb, ptr, type, member, result) ( \
873 read_extent_buffer(eb, (char *)(result), \
874 ((unsigned long)(ptr)) + \
875 offsetof(type, member), \
876 sizeof(((type *)0)->member)))
878 #define write_eb_member(eb, ptr, type, member, result) ( \
879 write_extent_buffer(eb, (char *)(result), \
880 ((unsigned long)(ptr)) + \
881 offsetof(type, member), \
882 sizeof(((type *)0)->member)))
884 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
885 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
887 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
888 return le##bits##_to_cpu(h->member); \
890 static inline void btrfs_set_##name(struct extent_buffer *eb, \
893 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
894 h->member = cpu_to_le##bits(val); \
897 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
898 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
901 unsigned long offset = (unsigned long)s; \
902 type *p = (type *) (eb->data + offset); \
903 return le##bits##_to_cpu(p->member); \
905 static inline void btrfs_set_##name(struct extent_buffer *eb, \
906 type *s, u##bits val) \
908 unsigned long offset = (unsigned long)s; \
909 type *p = (type *) (eb->data + offset); \
910 p->member = cpu_to_le##bits(val); \
913 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
914 static inline u##bits btrfs_##name(type *s) \
916 return le##bits##_to_cpu(s->member); \
918 static inline void btrfs_set_##name(type *s, u##bits val) \
920 s->member = cpu_to_le##bits(val); \
923 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
924 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
925 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
926 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
927 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
928 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
930 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
931 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
932 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
933 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
934 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
935 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
937 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
938 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
940 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
942 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
944 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
946 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
948 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
949 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
951 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
953 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
955 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
958 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
960 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
963 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
965 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
968 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
969 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
970 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
971 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
972 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
973 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
974 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
975 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
976 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
977 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
978 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
980 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
982 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
985 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
986 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
987 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
989 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
991 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
993 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
995 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
996 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
998 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1000 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1001 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1003 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1006 unsigned long offset = (unsigned long)c;
1007 offset += offsetof(struct btrfs_chunk, stripe);
1008 offset += nr * sizeof(struct btrfs_stripe);
1009 return (struct btrfs_stripe *)offset;
1012 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1014 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1017 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1018 struct btrfs_chunk *c, int nr)
1020 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1023 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1024 struct btrfs_chunk *c, int nr,
1027 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1030 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1031 struct btrfs_chunk *c, int nr)
1033 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1036 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1037 struct btrfs_chunk *c, int nr,
1040 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1043 /* struct btrfs_block_group_item */
1044 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1046 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1048 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1049 struct btrfs_block_group_item, chunk_objectid, 64);
1051 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1052 struct btrfs_block_group_item, chunk_objectid, 64);
1053 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1054 struct btrfs_block_group_item, flags, 64);
1055 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1056 struct btrfs_block_group_item, flags, 64);
1058 /* struct btrfs_inode_ref */
1059 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1060 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1061 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1063 /* struct btrfs_inode_item */
1064 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1065 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1066 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1067 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1068 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1069 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1070 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1071 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1072 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1073 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1074 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1075 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1077 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1078 struct btrfs_inode_item, generation, 64);
1079 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1080 struct btrfs_inode_item, generation, 64);
1081 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1082 struct btrfs_inode_item, size, 64);
1083 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1084 struct btrfs_inode_item, nbytes, 64);
1085 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1086 struct btrfs_inode_item, block_group, 64);
1087 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1088 struct btrfs_inode_item, nlink, 32);
1089 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1090 struct btrfs_inode_item, uid, 32);
1091 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1092 struct btrfs_inode_item, gid, 32);
1093 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1094 struct btrfs_inode_item, mode, 32);
1095 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1096 struct btrfs_inode_item, rdev, 64);
1097 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1098 struct btrfs_inode_item, flags, 64);
1100 static inline struct btrfs_timespec *
1101 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1103 unsigned long ptr = (unsigned long)inode_item;
1104 ptr += offsetof(struct btrfs_inode_item, atime);
1105 return (struct btrfs_timespec *)ptr;
1108 static inline struct btrfs_timespec *
1109 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1111 unsigned long ptr = (unsigned long)inode_item;
1112 ptr += offsetof(struct btrfs_inode_item, mtime);
1113 return (struct btrfs_timespec *)ptr;
1116 static inline struct btrfs_timespec *
1117 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1119 unsigned long ptr = (unsigned long)inode_item;
1120 ptr += offsetof(struct btrfs_inode_item, ctime);
1121 return (struct btrfs_timespec *)ptr;
1124 static inline struct btrfs_timespec *
1125 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1127 unsigned long ptr = (unsigned long)inode_item;
1128 ptr += offsetof(struct btrfs_inode_item, otime);
1129 return (struct btrfs_timespec *)ptr;
1132 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1133 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1134 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1136 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1139 /* struct btrfs_dev_extent */
1140 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1142 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1143 chunk_objectid, 64);
1144 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1146 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1148 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1150 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1151 return (u8 *)((unsigned long)dev + ptr);
1155 /* struct btrfs_extent_item */
1156 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1157 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1159 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1161 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1163 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1165 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1166 struct btrfs_tree_block_info *item,
1167 struct btrfs_disk_key *key)
1169 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1172 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1173 struct btrfs_tree_block_info *item,
1174 struct btrfs_disk_key *key)
1176 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1179 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1181 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1183 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1185 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1188 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1191 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1193 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1196 static inline u32 btrfs_extent_inline_ref_size(int type)
1198 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1199 type == BTRFS_SHARED_BLOCK_REF_KEY)
1200 return sizeof(struct btrfs_extent_inline_ref);
1201 if (type == BTRFS_SHARED_DATA_REF_KEY)
1202 return sizeof(struct btrfs_shared_data_ref) +
1203 sizeof(struct btrfs_extent_inline_ref);
1204 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1205 return sizeof(struct btrfs_extent_data_ref) +
1206 offsetof(struct btrfs_extent_inline_ref, offset);
1211 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1212 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1214 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1215 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1217 /* struct btrfs_node */
1218 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1219 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1221 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1224 ptr = offsetof(struct btrfs_node, ptrs) +
1225 sizeof(struct btrfs_key_ptr) * nr;
1226 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1229 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1233 ptr = offsetof(struct btrfs_node, ptrs) +
1234 sizeof(struct btrfs_key_ptr) * nr;
1235 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1238 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1241 ptr = offsetof(struct btrfs_node, ptrs) +
1242 sizeof(struct btrfs_key_ptr) * nr;
1243 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1246 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1250 ptr = offsetof(struct btrfs_node, ptrs) +
1251 sizeof(struct btrfs_key_ptr) * nr;
1252 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1255 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1257 return offsetof(struct btrfs_node, ptrs) +
1258 sizeof(struct btrfs_key_ptr) * nr;
1261 static inline void btrfs_node_key(struct extent_buffer *eb,
1262 struct btrfs_disk_key *disk_key, int nr)
1265 ptr = btrfs_node_key_ptr_offset(nr);
1266 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1267 struct btrfs_key_ptr, key, disk_key);
1270 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1271 struct btrfs_disk_key *disk_key, int nr)
1274 ptr = btrfs_node_key_ptr_offset(nr);
1275 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1276 struct btrfs_key_ptr, key, disk_key);
1279 /* struct btrfs_item */
1280 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1281 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1283 static inline unsigned long btrfs_item_nr_offset(int nr)
1285 return offsetof(struct btrfs_leaf, items) +
1286 sizeof(struct btrfs_item) * nr;
1289 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1292 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1295 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1296 struct btrfs_item *item)
1298 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1301 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1303 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1306 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1308 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1311 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1313 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1316 static inline void btrfs_item_key(struct extent_buffer *eb,
1317 struct btrfs_disk_key *disk_key, int nr)
1319 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1320 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1323 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1324 struct btrfs_disk_key *disk_key, int nr)
1326 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1327 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1330 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1333 * struct btrfs_root_ref
1335 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1336 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1337 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1339 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1340 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1341 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1343 /* struct btrfs_dir_item */
1344 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1345 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1346 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1347 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1349 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1350 struct btrfs_dir_item *item,
1351 struct btrfs_disk_key *key)
1353 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1356 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1357 struct btrfs_dir_item *item,
1358 struct btrfs_disk_key *key)
1360 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1363 /* struct btrfs_disk_key */
1364 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1366 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1367 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1369 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1370 struct btrfs_disk_key *disk)
1372 cpu->offset = le64_to_cpu(disk->offset);
1373 cpu->type = disk->type;
1374 cpu->objectid = le64_to_cpu(disk->objectid);
1377 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1378 struct btrfs_key *cpu)
1380 disk->offset = cpu_to_le64(cpu->offset);
1381 disk->type = cpu->type;
1382 disk->objectid = cpu_to_le64(cpu->objectid);
1385 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1386 struct btrfs_key *key, int nr)
1388 struct btrfs_disk_key disk_key;
1389 btrfs_node_key(eb, &disk_key, nr);
1390 btrfs_disk_key_to_cpu(key, &disk_key);
1393 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1394 struct btrfs_key *key, int nr)
1396 struct btrfs_disk_key disk_key;
1397 btrfs_item_key(eb, &disk_key, nr);
1398 btrfs_disk_key_to_cpu(key, &disk_key);
1401 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1402 struct btrfs_dir_item *item,
1403 struct btrfs_key *key)
1405 struct btrfs_disk_key disk_key;
1406 btrfs_dir_item_key(eb, item, &disk_key);
1407 btrfs_disk_key_to_cpu(key, &disk_key);
1411 static inline u8 btrfs_key_type(struct btrfs_key *key)
1416 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1421 /* struct btrfs_header */
1422 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1423 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1425 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1426 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1427 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1428 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1430 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1432 return (btrfs_header_flags(eb) & flag) == flag;
1435 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1437 u64 flags = btrfs_header_flags(eb);
1438 btrfs_set_header_flags(eb, flags | flag);
1439 return (flags & flag) == flag;
1442 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1444 u64 flags = btrfs_header_flags(eb);
1445 btrfs_set_header_flags(eb, flags & ~flag);
1446 return (flags & flag) == flag;
1449 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1451 u64 flags = btrfs_header_flags(eb);
1452 return flags >> BTRFS_BACKREF_REV_SHIFT;
1455 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1458 u64 flags = btrfs_header_flags(eb);
1459 flags &= ~BTRFS_BACKREF_REV_MASK;
1460 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1461 btrfs_set_header_flags(eb, flags);
1464 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1466 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1470 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1472 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1476 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1478 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1482 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1484 unsigned long ptr = offsetof(struct btrfs_header, csum);
1488 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1493 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1498 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1503 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1505 return (btrfs_header_level(eb) == 0);
1508 /* struct btrfs_root_item */
1509 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1511 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1512 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1513 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1515 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1517 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1518 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1519 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1520 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1521 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1522 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1523 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1524 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1528 /* struct btrfs_super_block */
1530 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1531 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1532 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1534 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1535 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1536 struct btrfs_super_block, sys_chunk_array_size, 32);
1537 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1538 struct btrfs_super_block, chunk_root_generation, 64);
1539 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1541 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1543 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1544 chunk_root_level, 8);
1545 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1547 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1548 log_root_transid, 64);
1549 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1551 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1553 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1555 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1557 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1559 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1561 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1563 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1564 root_dir_objectid, 64);
1565 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1567 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1569 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1571 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1572 incompat_flags, 64);
1573 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1575 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
1576 cache_generation, 64);
1578 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1580 int t = btrfs_super_csum_type(s);
1581 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1582 return btrfs_csum_sizes[t];
1585 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1587 return offsetof(struct btrfs_leaf, items);
1590 /* struct btrfs_file_extent_item */
1591 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1592 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
1594 static inline unsigned long btrfs_file_extent_inline_start(struct
1595 btrfs_file_extent_item *e)
1597 unsigned long offset = (unsigned long)e;
1598 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1602 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1604 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1607 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1609 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
1611 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1613 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
1615 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1616 disk_num_bytes, 64);
1617 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1619 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
1621 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1623 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
1625 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1627 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
1629 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1631 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
1633 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1635 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1636 other_encoding, 16);
1638 /* this returns the number of file bytes represented by the inline item.
1639 * If an item is compressed, this is the uncompressed size
1641 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1642 struct btrfs_file_extent_item *e)
1644 return btrfs_file_extent_ram_bytes(eb, e);
1648 * this returns the number of bytes used by the item on disk, minus the
1649 * size of any extent headers. If a file is compressed on disk, this is
1650 * the compressed size
1652 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1653 struct btrfs_item *e)
1655 unsigned long offset;
1656 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1657 return btrfs_item_size(eb, e) - offset;
1660 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1662 return root->leafsize;
1663 return root->nodesize;
1666 /* helper function to cast into the data area of the leaf. */
1667 #define btrfs_item_ptr(leaf, slot, type) \
1668 ((type *)(btrfs_leaf_data(leaf) + \
1669 btrfs_item_offset_nr(leaf, slot)))
1671 #define btrfs_item_ptr_offset(leaf, slot) \
1672 ((unsigned long)(btrfs_leaf_data(leaf) + \
1673 btrfs_item_offset_nr(leaf, slot)))
1676 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1677 struct btrfs_root *root);
1678 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1679 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1680 btrfs_fs_info *info,
1682 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1683 struct btrfs_block_group_cache
1684 *hint, u64 search_start,
1685 int data, int owner);
1686 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1687 struct btrfs_root *root,
1688 u32 blocksize, u64 root_objectid,
1689 struct btrfs_disk_key *key, int level,
1690 u64 hint, u64 empty_size);
1691 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1692 struct btrfs_root *root,
1693 u64 num_bytes, u64 parent,
1694 u64 root_objectid, u64 ref_generation,
1695 u64 owner, u64 empty_size, u64 hint_byte,
1696 u64 search_end, struct btrfs_key *ins, int data);
1697 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
1698 struct btrfs_root *root, u64 bytenr,
1699 u64 num_bytes, u64 *refs, u64 *flags);
1700 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
1701 struct btrfs_root *root,
1702 u64 bytenr, u64 num_bytes, u64 flags);
1703 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1704 struct extent_buffer *buf, int record_parent);
1705 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1706 struct extent_buffer *buf, int record_parent);
1707 int btrfs_free_extent(struct btrfs_trans_handle *trans,
1708 struct btrfs_root *root,
1709 u64 bytenr, u64 num_bytes, u64 parent,
1710 u64 root_objectid, u64 owner, u64 offset);
1711 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1712 struct btrfs_root *root,
1713 struct extent_io_tree *unpin);
1714 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1715 struct btrfs_root *root,
1716 u64 bytenr, u64 num_bytes, u64 parent,
1717 u64 root_objectid, u64 ref_generation,
1718 u64 owner_objectid);
1719 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
1720 struct btrfs_root *root, u64 bytenr,
1721 u64 orig_parent, u64 parent,
1722 u64 root_objectid, u64 ref_generation,
1723 u64 owner_objectid);
1724 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1725 struct btrfs_root *root);
1726 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1727 int btrfs_read_block_groups(struct btrfs_root *root);
1728 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
1729 struct btrfs_root *root, u64 bytes_used,
1730 u64 type, u64 chunk_objectid, u64 chunk_offset,
1732 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
1733 struct btrfs_root *root);
1734 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
1735 struct btrfs_root *root, u64 bytenr, u64 num,
1736 int alloc, int mark_free);
1738 int btrfs_previous_item(struct btrfs_root *root,
1739 struct btrfs_path *path, u64 min_objectid,
1741 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
1742 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1743 struct btrfs_root *root, struct extent_buffer *buf,
1744 struct extent_buffer *parent, int parent_slot,
1745 struct extent_buffer **cow_ret);
1746 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
1747 struct btrfs_root *root,
1748 struct extent_buffer *buf,
1749 struct extent_buffer *parent, int parent_slot,
1750 struct extent_buffer **cow_ret,
1751 u64 search_start, u64 empty_size);
1752 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1753 struct btrfs_root *root,
1754 struct extent_buffer *buf,
1755 struct extent_buffer **cow_ret, u64 new_root_objectid);
1756 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1757 *root, struct btrfs_path *path, u32 data_size);
1758 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1759 struct btrfs_root *root,
1760 struct btrfs_path *path,
1761 u32 new_size, int from_end);
1762 int btrfs_split_item(struct btrfs_trans_handle *trans,
1763 struct btrfs_root *root,
1764 struct btrfs_path *path,
1765 struct btrfs_key *new_key,
1766 unsigned long split_offset);
1767 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1768 *root, struct btrfs_key *key, struct btrfs_path *p, int
1770 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1771 struct btrfs_root *root, struct extent_buffer *parent,
1772 int start_slot, int cache_only, u64 *last_ret,
1773 struct btrfs_key *progress);
1774 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1775 struct btrfs_path *btrfs_alloc_path(void);
1776 void btrfs_free_path(struct btrfs_path *p);
1777 void btrfs_init_path(struct btrfs_path *p);
1778 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1779 struct btrfs_path *path, int slot, int nr);
1781 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1782 struct btrfs_root *root,
1783 struct btrfs_path *path)
1785 return btrfs_del_items(trans, root, path, path->slots[0], 1);
1788 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1789 *root, struct btrfs_key *key, void *data, u32 data_size);
1790 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1791 struct btrfs_root *root,
1792 struct btrfs_path *path,
1793 struct btrfs_key *cpu_key, u32 *data_size, int nr);
1795 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1796 struct btrfs_root *root,
1797 struct btrfs_path *path,
1798 struct btrfs_key *key,
1801 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1804 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1805 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1806 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1807 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1809 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
1810 struct btrfs_root *root, struct btrfs_path *path,
1811 struct btrfs_key *new_key);
1814 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
1815 struct btrfs_root *tree_root,
1816 u64 root_id, u8 type, u64 ref_id,
1817 u64 dirid, u64 sequence,
1818 const char *name, int name_len);
1819 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1820 struct btrfs_key *key);
1821 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1822 *root, struct btrfs_key *key, struct btrfs_root_item
1824 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1825 *root, struct btrfs_key *key, struct btrfs_root_item
1827 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1828 btrfs_root_item *item, struct btrfs_key *key);
1829 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1830 struct btrfs_root *latest_root);
1832 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1833 *root, const char *name, int name_len, u64 dir,
1834 struct btrfs_key *location, u8 type, u64 index);
1835 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1836 struct btrfs_root *root,
1837 struct btrfs_path *path, u64 dir,
1838 const char *name, int name_len,
1840 struct btrfs_dir_item *
1841 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1842 struct btrfs_root *root,
1843 struct btrfs_path *path, u64 dir,
1844 u64 objectid, const char *name, int name_len,
1846 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1847 struct btrfs_path *path,
1848 const char *name, int name_len);
1849 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1850 struct btrfs_root *root,
1851 struct btrfs_path *path,
1852 struct btrfs_dir_item *di);
1853 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1854 struct btrfs_root *root, const char *name,
1855 u16 name_len, const void *data, u16 data_len,
1857 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1858 struct btrfs_root *root,
1859 struct btrfs_path *path, u64 dir,
1860 const char *name, u16 name_len,
1863 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1864 struct btrfs_root *fs_root,
1865 u64 dirid, u64 *objectid);
1866 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1869 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1870 struct btrfs_root *root,
1871 const char *name, int name_len,
1872 u64 inode_objectid, u64 ref_objectid, u64 index);
1873 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1874 struct btrfs_root *root,
1875 const char *name, int name_len,
1876 u64 inode_objectid, u64 ref_objectid);
1877 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1878 struct btrfs_root *root,
1879 struct btrfs_path *path, u64 objectid);
1880 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1881 *root, u64 objectid, struct btrfs_inode_item
1883 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1884 *root, struct btrfs_path *path,
1885 struct btrfs_key *location, int mod);
1888 int btrfs_del_csums(struct btrfs_trans_handle *trans,
1889 struct btrfs_root *root, u64 bytenr, u64 len);
1890 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1891 struct btrfs_root *root,
1892 u64 objectid, u64 pos, u64 offset,
1895 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
1896 struct btrfs_root *root, u64 objectid,
1897 u64 offset, char *buffer, size_t size);
1898 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1899 struct btrfs_root *root,
1900 struct btrfs_path *path, u64 objectid,
1901 u64 bytenr, int mod);
1902 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1903 struct btrfs_root *root, u64 alloc_end,
1904 u64 bytenr, char *data, size_t len);
1905 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1906 struct btrfs_root *root,
1907 struct btrfs_path *path,
1908 u64 bytenr, int cow);
1909 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1910 struct btrfs_root *root, struct btrfs_path *path,