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"
30 struct btrfs_trans_handle;
31 #define BTRFS_MAGIC "_BHRfS_M"
33 #define BTRFS_MAX_LEVEL 8
35 #define BTRFS_COMPAT_EXTENT_TREE_V0
37 /* holds pointers to all of the tree roots */
38 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
40 /* stores information about which extents are in use, and reference counts */
41 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
44 * chunk tree stores translations from logical -> physical block numbering
45 * the super block points to the chunk tree
47 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
50 * stores information about which areas of a given device are in use.
51 * one per device. The tree of tree roots points to the device tree
53 #define BTRFS_DEV_TREE_OBJECTID 4ULL
55 /* one per subvolume, storing files and directories */
56 #define BTRFS_FS_TREE_OBJECTID 5ULL
58 /* directory objectid inside the root tree */
59 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
60 /* holds checksums of all the data extents */
61 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
62 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
65 /* for storing balance parameters in the root tree */
66 #define BTRFS_BALANCE_OBJECTID -4ULL
68 /* oprhan objectid for tracking unlinked/truncated files */
69 #define BTRFS_ORPHAN_OBJECTID -5ULL
71 /* does write ahead logging to speed up fsyncs */
72 #define BTRFS_TREE_LOG_OBJECTID -6ULL
73 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
76 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
77 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
80 * extent checksums all have this objectid
81 * this allows them to share the logging tree
84 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
86 /* For storing free space cache */
87 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
90 * The inode number assigned to the special inode for sotring
93 #define BTRFS_FREE_INO_OBJECTID -12ULL
95 /* dummy objectid represents multiple objectids */
96 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
99 * All files have objectids in this range.
101 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
102 #define BTRFS_LAST_FREE_OBJECTID -256ULL
103 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
108 * the device items go into the chunk tree. The key is in the form
109 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
111 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
114 * we can actually store much bigger names, but lets not confuse the rest
117 #define BTRFS_NAME_LEN 255
119 /* 32 bytes in various csum fields */
120 #define BTRFS_CSUM_SIZE 32
123 #define BTRFS_CSUM_TYPE_CRC32 0
125 static int btrfs_csum_sizes[] = { 4, 0 };
127 /* four bytes for CRC32 */
128 #define BTRFS_CRC32_SIZE 4
129 #define BTRFS_EMPTY_DIR_SIZE 0
131 #define BTRFS_FT_UNKNOWN 0
132 #define BTRFS_FT_REG_FILE 1
133 #define BTRFS_FT_DIR 2
134 #define BTRFS_FT_CHRDEV 3
135 #define BTRFS_FT_BLKDEV 4
136 #define BTRFS_FT_FIFO 5
137 #define BTRFS_FT_SOCK 6
138 #define BTRFS_FT_SYMLINK 7
139 #define BTRFS_FT_XATTR 8
140 #define BTRFS_FT_MAX 9
142 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
145 * the key defines the order in the tree, and so it also defines (optimal)
146 * block layout. objectid corresonds to the inode number. The flags
147 * tells us things about the object, and is a kind of stream selector.
148 * so for a given inode, keys with flags of 1 might refer to the inode
149 * data, flags of 2 may point to file data in the btree and flags == 3
150 * may point to extents.
152 * offset is the starting byte offset for this key in the stream.
154 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
155 * in cpu native order. Otherwise they are identical and their sizes
156 * should be the same (ie both packed)
158 struct btrfs_disk_key {
162 } __attribute__ ((__packed__));
168 } __attribute__ ((__packed__));
170 struct btrfs_mapping_tree {
171 struct cache_tree cache_tree;
174 #define BTRFS_UUID_SIZE 16
175 struct btrfs_dev_item {
176 /* the internal btrfs device id */
179 /* size of the device */
185 /* optimal io alignment for this device */
188 /* optimal io width for this device */
191 /* minimal io size for this device */
194 /* type and info about this device */
197 /* expected generation for this device */
201 * starting byte of this partition on the device,
202 * to allowr for stripe alignment in the future
206 /* grouping information for allocation decisions */
209 /* seek speed 0-100 where 100 is fastest */
212 /* bandwidth 0-100 where 100 is fastest */
215 /* btrfs generated uuid for this device */
216 u8 uuid[BTRFS_UUID_SIZE];
218 /* uuid of FS who owns this device */
219 u8 fsid[BTRFS_UUID_SIZE];
220 } __attribute__ ((__packed__));
222 struct btrfs_stripe {
225 u8 dev_uuid[BTRFS_UUID_SIZE];
226 } __attribute__ ((__packed__));
229 /* size of this chunk in bytes */
232 /* objectid of the root referencing this chunk */
238 /* optimal io alignment for this chunk */
241 /* optimal io width for this chunk */
244 /* minimal io size for this chunk */
247 /* 2^16 stripes is quite a lot, a second limit is the size of a single
252 /* sub stripes only matter for raid10 */
254 struct btrfs_stripe stripe;
255 /* additional stripes go here */
256 } __attribute__ ((__packed__));
258 struct btrfs_free_space_header {
259 struct btrfs_disk_key location;
263 } __attribute__ ((__packed__));
265 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
267 BUG_ON(num_stripes == 0);
268 return sizeof(struct btrfs_chunk) +
269 sizeof(struct btrfs_stripe) * (num_stripes - 1);
272 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
273 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
274 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
275 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
277 #define BTRFS_BACKREF_REV_MAX 256
278 #define BTRFS_BACKREF_REV_SHIFT 56
279 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
280 BTRFS_BACKREF_REV_SHIFT)
282 #define BTRFS_OLD_BACKREF_REV 0
283 #define BTRFS_MIXED_BACKREF_REV 1
286 * every tree block (leaf or node) starts with this header.
288 struct btrfs_header {
289 /* these first four must match the super block */
290 u8 csum[BTRFS_CSUM_SIZE];
291 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
292 __le64 bytenr; /* which block this node is supposed to live in */
295 /* allowed to be different from the super from here on down */
296 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
301 } __attribute__ ((__packed__));
303 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
304 sizeof(struct btrfs_header)) / \
305 sizeof(struct btrfs_key_ptr))
306 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
307 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
308 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
309 sizeof(struct btrfs_item) - \
310 sizeof(struct btrfs_file_extent_item))
311 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
312 sizeof(struct btrfs_item) -\
313 sizeof(struct btrfs_dir_item))
317 * this is a very generous portion of the super block, giving us
318 * room to translate 14 chunks with 3 stripes each.
320 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
321 #define BTRFS_LABEL_SIZE 256
324 * just in case we somehow lose the roots and are not able to mount,
325 * we store an array of the roots from previous transactions
328 #define BTRFS_NUM_BACKUP_ROOTS 4
329 struct btrfs_root_backup {
331 __le64 tree_root_gen;
334 __le64 chunk_root_gen;
337 __le64 extent_root_gen;
346 __le64 csum_root_gen;
356 u8 extent_root_level;
360 /* future and to align */
362 } __attribute__ ((__packed__));
365 * the super block basically lists the main trees of the FS
366 * it currently lacks any block count etc etc
368 struct btrfs_super_block {
369 u8 csum[BTRFS_CSUM_SIZE];
370 /* the first 3 fields must match struct btrfs_header */
371 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
372 __le64 bytenr; /* this block number */
375 /* allowed to be different from the btrfs_header from here own down */
382 /* this will help find the new super based on the log root */
383 __le64 log_root_transid;
386 __le64 root_dir_objectid;
392 __le32 sys_chunk_array_size;
393 __le64 chunk_root_generation;
395 __le64 compat_ro_flags;
396 __le64 incompat_flags;
401 struct btrfs_dev_item dev_item;
403 char label[BTRFS_LABEL_SIZE];
405 __le64 cache_generation;
407 /* future expansion */
409 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
410 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
411 } __attribute__ ((__packed__));
414 * Compat flags that we support. If any incompat flags are set other than the
415 * ones specified below then we will fail to mount
417 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
418 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
419 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
420 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
422 * some patches floated around with a second compression method
423 * lets save that incompat here for when they do get in
424 * Note we don't actually support it, we're just reserving the
427 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
430 * older kernels tried to do bigger metadata blocks, but the
431 * code was pretty buggy. Lets not let them try anymore.
433 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
436 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
437 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
438 #define BTRFS_FEATURE_INCOMPAT_SUPP \
439 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
440 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
441 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
442 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
443 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
446 * A leaf is full of items. offset and size tell us where to find
447 * the item in the leaf (relative to the start of the data area)
450 struct btrfs_disk_key key;
453 } __attribute__ ((__packed__));
456 * leaves have an item area and a data area:
457 * [item0, item1....itemN] [free space] [dataN...data1, data0]
459 * The data is separate from the items to get the keys closer together
463 struct btrfs_header header;
464 struct btrfs_item items[];
465 } __attribute__ ((__packed__));
468 * all non-leaf blocks are nodes, they hold only keys and pointers to
471 struct btrfs_key_ptr {
472 struct btrfs_disk_key key;
475 } __attribute__ ((__packed__));
478 struct btrfs_header header;
479 struct btrfs_key_ptr ptrs[];
480 } __attribute__ ((__packed__));
483 * btrfs_paths remember the path taken from the root down to the leaf.
484 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
485 * to any other levels that are present.
487 * The slots array records the index of the item or block pointer
488 * used while walking the tree.
492 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
493 int slots[BTRFS_MAX_LEVEL];
494 /* if there is real range locking, this locks field will change */
495 int locks[BTRFS_MAX_LEVEL];
497 /* keep some upper locks as we walk down */
501 * set by btrfs_split_item, tells search_slot to keep all locks
502 * and to force calls to keep space in the nodes
504 unsigned int search_for_split:1;
505 unsigned int keep_locks:1;
506 unsigned int skip_locking:1;
507 unsigned int leave_spinning:1;
511 * items in the extent btree are used to record the objectid of the
512 * owner of the block and the number of references
515 struct btrfs_extent_item {
519 } __attribute__ ((__packed__));
521 struct btrfs_extent_item_v0 {
523 } __attribute__ ((__packed__));
525 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
526 sizeof(struct btrfs_item))
528 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
529 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
531 /* following flags only apply to tree blocks */
533 /* use full backrefs for extent pointers in the block*/
534 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
536 struct btrfs_tree_block_info {
537 struct btrfs_disk_key key;
539 } __attribute__ ((__packed__));
541 struct btrfs_extent_data_ref {
546 } __attribute__ ((__packed__));
548 struct btrfs_shared_data_ref {
550 } __attribute__ ((__packed__));
552 struct btrfs_extent_inline_ref {
555 } __attribute__ ((__packed__));
557 struct btrfs_extent_ref_v0 {
562 } __attribute__ ((__packed__));
564 /* dev extents record free space on individual devices. The owner
565 * field points back to the chunk allocation mapping tree that allocated
566 * the extent. The chunk tree uuid field is a way to double check the owner
568 struct btrfs_dev_extent {
570 __le64 chunk_objectid;
573 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
574 } __attribute__ ((__packed__));
576 struct btrfs_inode_ref {
580 } __attribute__ ((__packed__));
582 struct btrfs_timespec {
585 } __attribute__ ((__packed__));
588 BTRFS_COMPRESS_NONE = 0,
589 BTRFS_COMPRESS_ZLIB = 1,
590 BTRFS_COMPRESS_LZO = 2,
591 BTRFS_COMPRESS_TYPES = 2,
592 BTRFS_COMPRESS_LAST = 3,
593 } btrfs_compression_type;
595 /* we don't understand any encryption methods right now */
597 BTRFS_ENCRYPTION_NONE = 0,
598 BTRFS_ENCRYPTION_LAST = 1,
599 } btrfs_encryption_type;
601 struct btrfs_inode_item {
602 /* nfs style generation number */
604 /* transid that last touched this inode */
616 /* modification sequence number for NFS */
620 * a little future expansion, for more than this we can
621 * just grow the inode item and version it
624 struct btrfs_timespec atime;
625 struct btrfs_timespec ctime;
626 struct btrfs_timespec mtime;
627 struct btrfs_timespec otime;
628 } __attribute__ ((__packed__));
630 struct btrfs_dir_log_item {
632 } __attribute__ ((__packed__));
634 struct btrfs_dir_item {
635 struct btrfs_disk_key location;
640 } __attribute__ ((__packed__));
642 struct btrfs_root_item_v0 {
643 struct btrfs_inode_item inode;
649 __le64 last_snapshot;
652 struct btrfs_disk_key drop_progress;
655 } __attribute__ ((__packed__));
657 struct btrfs_root_item {
658 struct btrfs_inode_item inode;
664 __le64 last_snapshot;
667 struct btrfs_disk_key drop_progress;
672 * The following fields appear after subvol_uuids+subvol_times
677 * This generation number is used to test if the new fields are valid
678 * and up to date while reading the root item. Everytime the root item
679 * is written out, the "generation" field is copied into this field. If
680 * anyone ever mounted the fs with an older kernel, we will have
681 * mismatching generation values here and thus must invalidate the
682 * new fields. See btrfs_update_root and btrfs_find_last_root for
684 * the offset of generation_v2 is also used as the start for the memset
685 * when invalidating the fields.
687 __le64 generation_v2;
688 u8 uuid[BTRFS_UUID_SIZE];
689 u8 parent_uuid[BTRFS_UUID_SIZE];
690 u8 received_uuid[BTRFS_UUID_SIZE];
691 __le64 ctransid; /* updated when an inode changes */
692 __le64 otransid; /* trans when created */
693 __le64 stransid; /* trans when sent. non-zero for received subvol */
694 __le64 rtransid; /* trans when received. non-zero for received subvol */
695 struct btrfs_timespec ctime;
696 struct btrfs_timespec otime;
697 struct btrfs_timespec stime;
698 struct btrfs_timespec rtime;
699 __le64 reserved[8]; /* for future */
700 } __attribute__ ((__packed__));
703 * this is used for both forward and backward root refs
705 struct btrfs_root_ref {
709 } __attribute__ ((__packed__));
711 #define BTRFS_FILE_EXTENT_INLINE 0
712 #define BTRFS_FILE_EXTENT_REG 1
713 #define BTRFS_FILE_EXTENT_PREALLOC 2
715 struct btrfs_file_extent_item {
717 * transaction id that created this extent
721 * max number of bytes to hold this extent in ram
722 * when we split a compressed extent we can't know how big
723 * each of the resulting pieces will be. So, this is
724 * an upper limit on the size of the extent in ram instead of
730 * 32 bits for the various ways we might encode the data,
731 * including compression and encryption. If any of these
732 * are set to something a given disk format doesn't understand
733 * it is treated like an incompat flag for reading and writing,
738 __le16 other_encoding; /* spare for later use */
740 /* are we inline data or a real extent? */
744 * disk space consumed by the extent, checksum blocks are included
748 __le64 disk_num_bytes;
750 * the logical offset in file blocks (no csums)
751 * this extent record is for. This allows a file extent to point
752 * into the middle of an existing extent on disk, sharing it
753 * between two snapshots (useful if some bytes in the middle of the
754 * extent have changed
758 * the logical number of file blocks (no csums included)
762 } __attribute__ ((__packed__));
764 struct btrfs_csum_item {
766 } __attribute__ ((__packed__));
768 /* tag for the radix tree of block groups in ram */
769 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
770 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
771 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
772 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
773 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
774 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
775 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
776 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
778 /* used in struct btrfs_balance_args fields */
779 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
781 #define BTRFS_QGROUP_STATUS_OFF 0
782 #define BTRFS_QGROUP_STATUS_ON 1
783 #define BTRFS_QGROUP_STATUS_SCANNING 2
785 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1 << 0)
787 struct btrfs_qgroup_status_item {
791 __le64 scan; /* progress during scanning */
792 } __attribute__ ((__packed__));
794 struct btrfs_block_group_item {
796 __le64 chunk_objectid;
798 } __attribute__ ((__packed__));
800 struct btrfs_qgroup_info_item {
803 __le64 referenced_compressed;
805 __le64 exclusive_compressed;
806 } __attribute__ ((__packed__));
808 /* flags definition for qgroup limits */
809 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
810 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
811 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
812 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
813 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
814 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
816 struct btrfs_qgroup_limit_item {
818 __le64 max_referenced;
819 __le64 max_exclusive;
820 __le64 rsv_referenced;
821 __le64 rsv_exclusive;
822 } __attribute__ ((__packed__));
824 struct btrfs_space_info {
830 struct list_head list;
833 struct btrfs_block_group_cache {
834 struct cache_extent cache;
835 struct btrfs_key key;
836 struct btrfs_block_group_item item;
837 struct btrfs_space_info *space_info;
844 struct btrfs_extent_ops {
845 int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
846 u64 hint_byte, struct btrfs_key *ins);
847 int (*free_extent)(struct btrfs_root *root, u64 bytenr,
852 struct btrfs_fs_devices;
853 struct btrfs_fs_info {
854 u8 fsid[BTRFS_FSID_SIZE];
855 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
856 struct btrfs_root *fs_root;
857 struct btrfs_root *extent_root;
858 struct btrfs_root *tree_root;
859 struct btrfs_root *chunk_root;
860 struct btrfs_root *dev_root;
861 struct btrfs_root *csum_root;
863 struct cache_tree fs_root_cache;
865 /* the log root tree is a directory of all the other log roots */
866 struct btrfs_root *log_root_tree;
868 struct extent_io_tree extent_cache;
869 struct extent_io_tree free_space_cache;
870 struct extent_io_tree block_group_cache;
871 struct extent_io_tree pinned_extents;
872 struct extent_io_tree pending_del;
873 struct extent_io_tree extent_ins;
875 /* logical->physical extent mapping */
876 struct btrfs_mapping_tree mapping_tree;
879 u64 last_trans_committed;
881 u64 avail_data_alloc_bits;
882 u64 avail_metadata_alloc_bits;
883 u64 avail_system_alloc_bits;
884 u64 data_alloc_profile;
885 u64 metadata_alloc_profile;
886 u64 system_alloc_profile;
889 struct btrfs_trans_handle *running_transaction;
890 struct btrfs_super_block super_copy;
891 struct mutex fs_mutex;
896 struct btrfs_extent_ops *extent_ops;
897 struct list_head dirty_cowonly_roots;
899 struct btrfs_fs_devices *fs_devices;
900 struct list_head space_info;
903 int (*free_extent_hook)(struct btrfs_trans_handle *trans,
904 struct btrfs_root *root,
905 u64 bytenr, u64 num_bytes, u64 parent,
906 u64 root_objectid, u64 owner, u64 offset,
908 struct cache_tree *fsck_extent_cache;
909 struct cache_tree *corrupt_blocks;
913 * in ram representation of the tree. extent_root is used for all allocations
914 * and for the extent tree extent_root root.
917 struct extent_buffer *node;
918 struct extent_buffer *commit_root;
919 struct btrfs_root_item root_item;
920 struct btrfs_key root_key;
921 struct btrfs_fs_info *fs_info;
925 /* data allocations are done in sectorsize units */
928 /* node allocations are done in nodesize units */
931 /* leaf allocations are done in leafsize units */
934 /* leaf allocations are done in leafsize units */
943 u64 last_inode_alloc;
945 /* the dirty list is only used by non-reference counted roots */
946 struct list_head dirty_list;
947 struct cache_extent cache;
951 * inode items have the data typically returned from stat and store other
952 * info about object characteristics. There is one for every file and dir in
955 #define BTRFS_INODE_ITEM_KEY 1
956 #define BTRFS_INODE_REF_KEY 12
957 #define BTRFS_XATTR_ITEM_KEY 24
958 #define BTRFS_ORPHAN_ITEM_KEY 48
960 #define BTRFS_DIR_LOG_ITEM_KEY 60
961 #define BTRFS_DIR_LOG_INDEX_KEY 72
963 * dir items are the name -> inode pointers in a directory. There is one
964 * for every name in a directory.
966 #define BTRFS_DIR_ITEM_KEY 84
967 #define BTRFS_DIR_INDEX_KEY 96
970 * extent data is for file data
972 #define BTRFS_EXTENT_DATA_KEY 108
975 * csum items have the checksums for data in the extents
977 #define BTRFS_CSUM_ITEM_KEY 120
979 * extent csums are stored in a separate tree and hold csums for
980 * an entire extent on disk.
982 #define BTRFS_EXTENT_CSUM_KEY 128
985 * root items point to tree roots. There are typically in the root
986 * tree used by the super block to find all the other trees
988 #define BTRFS_ROOT_ITEM_KEY 132
991 * root backrefs tie subvols and snapshots to the directory entries that
994 #define BTRFS_ROOT_BACKREF_KEY 144
997 * root refs make a fast index for listing all of the snapshots and
998 * subvolumes referenced by a given root. They point directly to the
999 * directory item in the root that references the subvol
1001 #define BTRFS_ROOT_REF_KEY 156
1004 * extent items are in the extent map tree. These record which blocks
1005 * are used, and how many references there are to each block
1007 #define BTRFS_EXTENT_ITEM_KEY 168
1009 #define BTRFS_TREE_BLOCK_REF_KEY 176
1011 #define BTRFS_EXTENT_DATA_REF_KEY 178
1013 /* old style extent backrefs */
1014 #define BTRFS_EXTENT_REF_V0_KEY 180
1016 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1018 #define BTRFS_SHARED_DATA_REF_KEY 184
1022 * block groups give us hints into the extent allocation trees. Which
1023 * blocks are free etc etc
1025 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1027 #define BTRFS_DEV_EXTENT_KEY 204
1028 #define BTRFS_DEV_ITEM_KEY 216
1029 #define BTRFS_CHUNK_ITEM_KEY 228
1031 #define BTRFS_BALANCE_ITEM_KEY 248
1036 #define BTRFS_QGROUP_STATUS_KEY 240
1037 #define BTRFS_QGROUP_INFO_KEY 242
1038 #define BTRFS_QGROUP_LIMIT_KEY 244
1039 #define BTRFS_QGROUP_RELATION_KEY 246
1042 * string items are for debugging. They just store a short string of
1045 #define BTRFS_STRING_ITEM_KEY 253
1049 #define BTRFS_INODE_NODATASUM (1 << 0)
1050 #define BTRFS_INODE_NODATACOW (1 << 1)
1051 #define BTRFS_INODE_READONLY (1 << 2)
1053 #define read_eb_member(eb, ptr, type, member, result) ( \
1054 read_extent_buffer(eb, (char *)(result), \
1055 ((unsigned long)(ptr)) + \
1056 offsetof(type, member), \
1057 sizeof(((type *)0)->member)))
1059 #define write_eb_member(eb, ptr, type, member, result) ( \
1060 write_extent_buffer(eb, (char *)(result), \
1061 ((unsigned long)(ptr)) + \
1062 offsetof(type, member), \
1063 sizeof(((type *)0)->member)))
1065 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1066 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1068 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1069 return le##bits##_to_cpu(h->member); \
1071 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1074 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1075 h->member = cpu_to_le##bits(val); \
1078 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1079 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
1082 unsigned long offset = (unsigned long)s; \
1083 type *p = (type *) (eb->data + offset); \
1084 return le##bits##_to_cpu(p->member); \
1086 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1087 type *s, u##bits val) \
1089 unsigned long offset = (unsigned long)s; \
1090 type *p = (type *) (eb->data + offset); \
1091 p->member = cpu_to_le##bits(val); \
1094 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1095 static inline u##bits btrfs_##name(type *s) \
1097 return le##bits##_to_cpu(s->member); \
1099 static inline void btrfs_set_##name(type *s, u##bits val) \
1101 s->member = cpu_to_le##bits(val); \
1104 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1105 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1106 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1107 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1108 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1109 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1111 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1112 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1113 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1114 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1115 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1116 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1118 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1119 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1121 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1123 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1125 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1127 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1129 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1130 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1132 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1134 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1136 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1139 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1141 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1144 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1146 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1149 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1150 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1151 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1152 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1153 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1154 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1155 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1156 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1157 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1158 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1159 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1161 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1163 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1166 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1167 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1168 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1170 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1172 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1174 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1176 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1177 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1179 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1181 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1182 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1184 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1187 unsigned long offset = (unsigned long)c;
1188 offset += offsetof(struct btrfs_chunk, stripe);
1189 offset += nr * sizeof(struct btrfs_stripe);
1190 return (struct btrfs_stripe *)offset;
1193 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1195 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1198 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1199 struct btrfs_chunk *c, int nr)
1201 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1204 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1205 struct btrfs_chunk *c, int nr,
1208 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1211 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1212 struct btrfs_chunk *c, int nr)
1214 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1217 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1218 struct btrfs_chunk *c, int nr,
1221 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1224 /* struct btrfs_block_group_item */
1225 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1227 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1229 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1230 struct btrfs_block_group_item, chunk_objectid, 64);
1232 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1233 struct btrfs_block_group_item, chunk_objectid, 64);
1234 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1235 struct btrfs_block_group_item, flags, 64);
1236 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1237 struct btrfs_block_group_item, flags, 64);
1239 /* struct btrfs_inode_ref */
1240 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1241 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1242 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1244 /* struct btrfs_inode_item */
1245 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1246 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1247 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1248 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1249 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1250 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1251 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1252 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1253 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1254 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1255 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1256 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1258 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1259 struct btrfs_inode_item, generation, 64);
1260 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1261 struct btrfs_inode_item, generation, 64);
1262 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1263 struct btrfs_inode_item, size, 64);
1264 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1265 struct btrfs_inode_item, nbytes, 64);
1266 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1267 struct btrfs_inode_item, block_group, 64);
1268 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1269 struct btrfs_inode_item, nlink, 32);
1270 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1271 struct btrfs_inode_item, uid, 32);
1272 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1273 struct btrfs_inode_item, gid, 32);
1274 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1275 struct btrfs_inode_item, mode, 32);
1276 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1277 struct btrfs_inode_item, rdev, 64);
1278 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1279 struct btrfs_inode_item, flags, 64);
1281 static inline struct btrfs_timespec *
1282 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1284 unsigned long ptr = (unsigned long)inode_item;
1285 ptr += offsetof(struct btrfs_inode_item, atime);
1286 return (struct btrfs_timespec *)ptr;
1289 static inline struct btrfs_timespec *
1290 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1292 unsigned long ptr = (unsigned long)inode_item;
1293 ptr += offsetof(struct btrfs_inode_item, mtime);
1294 return (struct btrfs_timespec *)ptr;
1297 static inline struct btrfs_timespec *
1298 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1300 unsigned long ptr = (unsigned long)inode_item;
1301 ptr += offsetof(struct btrfs_inode_item, ctime);
1302 return (struct btrfs_timespec *)ptr;
1305 static inline struct btrfs_timespec *
1306 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1308 unsigned long ptr = (unsigned long)inode_item;
1309 ptr += offsetof(struct btrfs_inode_item, otime);
1310 return (struct btrfs_timespec *)ptr;
1313 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1314 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1315 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1317 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1320 /* struct btrfs_dev_extent */
1321 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1323 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1324 chunk_objectid, 64);
1325 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1327 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1329 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1331 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1332 return (u8 *)((unsigned long)dev + ptr);
1336 /* struct btrfs_extent_item */
1337 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1338 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1340 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1342 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1344 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1346 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1347 struct btrfs_tree_block_info *item,
1348 struct btrfs_disk_key *key)
1350 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1353 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1354 struct btrfs_tree_block_info *item,
1355 struct btrfs_disk_key *key)
1357 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1360 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1362 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1364 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1366 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1369 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1372 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1374 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1377 static inline u32 btrfs_extent_inline_ref_size(int type)
1379 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1380 type == BTRFS_SHARED_BLOCK_REF_KEY)
1381 return sizeof(struct btrfs_extent_inline_ref);
1382 if (type == BTRFS_SHARED_DATA_REF_KEY)
1383 return sizeof(struct btrfs_shared_data_ref) +
1384 sizeof(struct btrfs_extent_inline_ref);
1385 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1386 return sizeof(struct btrfs_extent_data_ref) +
1387 offsetof(struct btrfs_extent_inline_ref, offset);
1392 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1393 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1395 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1396 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1398 /* struct btrfs_node */
1399 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1400 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1402 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1405 ptr = offsetof(struct btrfs_node, ptrs) +
1406 sizeof(struct btrfs_key_ptr) * nr;
1407 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1410 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1414 ptr = offsetof(struct btrfs_node, ptrs) +
1415 sizeof(struct btrfs_key_ptr) * nr;
1416 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1419 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1422 ptr = offsetof(struct btrfs_node, ptrs) +
1423 sizeof(struct btrfs_key_ptr) * nr;
1424 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1427 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1431 ptr = offsetof(struct btrfs_node, ptrs) +
1432 sizeof(struct btrfs_key_ptr) * nr;
1433 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1436 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1438 return offsetof(struct btrfs_node, ptrs) +
1439 sizeof(struct btrfs_key_ptr) * nr;
1442 static inline void btrfs_node_key(struct extent_buffer *eb,
1443 struct btrfs_disk_key *disk_key, int nr)
1446 ptr = btrfs_node_key_ptr_offset(nr);
1447 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1448 struct btrfs_key_ptr, key, disk_key);
1451 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1452 struct btrfs_disk_key *disk_key, int nr)
1455 ptr = btrfs_node_key_ptr_offset(nr);
1456 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1457 struct btrfs_key_ptr, key, disk_key);
1460 /* struct btrfs_item */
1461 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1462 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1464 static inline unsigned long btrfs_item_nr_offset(int nr)
1466 return offsetof(struct btrfs_leaf, items) +
1467 sizeof(struct btrfs_item) * nr;
1470 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1473 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1476 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1477 struct btrfs_item *item)
1479 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1482 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1484 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1487 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1489 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1492 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1494 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1497 static inline void btrfs_item_key(struct extent_buffer *eb,
1498 struct btrfs_disk_key *disk_key, int nr)
1500 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1501 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1504 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1505 struct btrfs_disk_key *disk_key, int nr)
1507 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1508 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1511 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1514 * struct btrfs_root_ref
1516 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1517 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1518 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1520 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1521 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1522 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1524 /* struct btrfs_dir_item */
1525 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1526 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1527 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1528 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1530 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1532 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1533 struct btrfs_dir_item *item,
1534 struct btrfs_disk_key *key)
1536 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1539 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1540 struct btrfs_dir_item *item,
1541 struct btrfs_disk_key *key)
1543 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1546 /* struct btrfs_free_space_header */
1547 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1549 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1551 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1554 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1555 struct btrfs_free_space_header *h,
1556 struct btrfs_disk_key *key)
1558 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1561 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1562 struct btrfs_free_space_header *h,
1563 struct btrfs_disk_key *key)
1565 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1568 /* struct btrfs_disk_key */
1569 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1571 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1572 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1574 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1575 struct btrfs_disk_key *disk)
1577 cpu->offset = le64_to_cpu(disk->offset);
1578 cpu->type = disk->type;
1579 cpu->objectid = le64_to_cpu(disk->objectid);
1582 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1583 struct btrfs_key *cpu)
1585 disk->offset = cpu_to_le64(cpu->offset);
1586 disk->type = cpu->type;
1587 disk->objectid = cpu_to_le64(cpu->objectid);
1590 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1591 struct btrfs_key *key, int nr)
1593 struct btrfs_disk_key disk_key;
1594 btrfs_node_key(eb, &disk_key, nr);
1595 btrfs_disk_key_to_cpu(key, &disk_key);
1598 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1599 struct btrfs_key *key, int nr)
1601 struct btrfs_disk_key disk_key;
1602 btrfs_item_key(eb, &disk_key, nr);
1603 btrfs_disk_key_to_cpu(key, &disk_key);
1606 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1607 struct btrfs_dir_item *item,
1608 struct btrfs_key *key)
1610 struct btrfs_disk_key disk_key;
1611 btrfs_dir_item_key(eb, item, &disk_key);
1612 btrfs_disk_key_to_cpu(key, &disk_key);
1616 static inline u8 btrfs_key_type(struct btrfs_key *key)
1621 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1626 /* struct btrfs_header */
1627 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1628 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1630 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1631 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1632 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1633 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1635 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1637 return (btrfs_header_flags(eb) & flag) == flag;
1640 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1642 u64 flags = btrfs_header_flags(eb);
1643 btrfs_set_header_flags(eb, flags | flag);
1644 return (flags & flag) == flag;
1647 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1649 u64 flags = btrfs_header_flags(eb);
1650 btrfs_set_header_flags(eb, flags & ~flag);
1651 return (flags & flag) == flag;
1654 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1656 u64 flags = btrfs_header_flags(eb);
1657 return flags >> BTRFS_BACKREF_REV_SHIFT;
1660 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1663 u64 flags = btrfs_header_flags(eb);
1664 flags &= ~BTRFS_BACKREF_REV_MASK;
1665 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1666 btrfs_set_header_flags(eb, flags);
1669 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1671 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1675 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1677 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1681 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1683 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1687 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1689 unsigned long ptr = offsetof(struct btrfs_header, csum);
1693 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1698 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1703 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1708 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1710 return (btrfs_header_level(eb) == 0);
1713 /* struct btrfs_root_item */
1714 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1716 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1717 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1718 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1720 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1722 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1723 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1724 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1725 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1726 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1727 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1728 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1729 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1731 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
1733 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
1735 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
1737 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
1739 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
1742 /* struct btrfs_root_backup */
1743 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
1745 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
1747 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
1748 tree_root_level, 8);
1750 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
1752 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
1753 chunk_root_gen, 64);
1754 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
1755 chunk_root_level, 8);
1757 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
1759 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
1760 extent_root_gen, 64);
1761 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
1762 extent_root_level, 8);
1764 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
1766 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
1768 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
1771 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
1773 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
1775 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
1778 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
1780 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
1782 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
1783 csum_root_level, 8);
1784 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
1786 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
1788 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
1791 /* struct btrfs_super_block */
1793 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1794 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1795 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1797 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1798 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1799 struct btrfs_super_block, sys_chunk_array_size, 32);
1800 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1801 struct btrfs_super_block, chunk_root_generation, 64);
1802 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1804 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1806 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1807 chunk_root_level, 8);
1808 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1810 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1811 log_root_transid, 64);
1812 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1814 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1816 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1818 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1820 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1822 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1824 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1826 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1827 root_dir_objectid, 64);
1828 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1830 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1832 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1834 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1835 incompat_flags, 64);
1836 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1838 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
1839 cache_generation, 64);
1841 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1843 int t = btrfs_super_csum_type(s);
1844 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1845 return btrfs_csum_sizes[t];
1848 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1850 return offsetof(struct btrfs_leaf, items);
1853 /* struct btrfs_file_extent_item */
1854 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1855 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
1857 static inline unsigned long btrfs_file_extent_inline_start(struct
1858 btrfs_file_extent_item *e)
1860 unsigned long offset = (unsigned long)e;
1861 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1865 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1867 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1870 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1872 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
1874 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1876 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
1878 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1879 disk_num_bytes, 64);
1880 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1882 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
1884 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1886 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
1888 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1890 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
1892 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1894 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
1896 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1898 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1899 other_encoding, 16);
1901 /* btrfs_qgroup_status_item */
1902 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
1904 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
1906 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
1908 BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
1911 /* btrfs_qgroup_info_item */
1912 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
1914 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
1916 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
1917 struct btrfs_qgroup_info_item, referenced_compressed, 64);
1918 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
1920 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
1921 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
1923 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
1924 struct btrfs_qgroup_info_item, generation, 64);
1925 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
1926 struct btrfs_qgroup_info_item, referenced, 64);
1927 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
1928 struct btrfs_qgroup_info_item, referenced_compressed, 64);
1929 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
1930 struct btrfs_qgroup_info_item, exclusive, 64);
1931 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
1932 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
1934 /* btrfs_qgroup_limit_item */
1935 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
1937 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
1938 max_referenced, 64);
1939 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
1941 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
1942 rsv_referenced, 64);
1943 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
1946 /* this returns the number of file bytes represented by the inline item.
1947 * If an item is compressed, this is the uncompressed size
1949 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1950 struct btrfs_file_extent_item *e)
1952 return btrfs_file_extent_ram_bytes(eb, e);
1956 * this returns the number of bytes used by the item on disk, minus the
1957 * size of any extent headers. If a file is compressed on disk, this is
1958 * the compressed size
1960 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1961 struct btrfs_item *e)
1963 unsigned long offset;
1964 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1965 return btrfs_item_size(eb, e) - offset;
1968 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1970 return root->leafsize;
1971 return root->nodesize;
1974 /* helper function to cast into the data area of the leaf. */
1975 #define btrfs_item_ptr(leaf, slot, type) \
1976 ((type *)(btrfs_leaf_data(leaf) + \
1977 btrfs_item_offset_nr(leaf, slot)))
1979 #define btrfs_item_ptr_offset(leaf, slot) \
1980 ((unsigned long)(btrfs_leaf_data(leaf) + \
1981 btrfs_item_offset_nr(leaf, slot)))
1984 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
1985 struct btrfs_root *root);
1986 int btrfs_check_block_accounting(struct btrfs_root *root);
1987 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
1988 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1989 struct btrfs_root *root);
1990 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1991 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1992 btrfs_fs_info *info,
1994 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1995 struct btrfs_block_group_cache
1996 *hint, u64 search_start,
1997 int data, int owner);
1998 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1999 struct btrfs_root *root,
2000 u32 blocksize, u64 root_objectid,
2001 struct btrfs_disk_key *key, int level,
2002 u64 hint, u64 empty_size);
2003 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
2004 struct btrfs_root *root,
2005 u64 num_bytes, u64 parent,
2006 u64 root_objectid, u64 ref_generation,
2007 u64 owner, u64 empty_size, u64 hint_byte,
2008 u64 search_end, struct btrfs_key *ins, int data);
2009 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2010 struct btrfs_root *root, u64 bytenr,
2011 u64 num_bytes, u64 *refs, u64 *flags);
2012 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
2013 struct btrfs_root *root,
2014 u64 bytenr, u64 num_bytes, u64 flags);
2015 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2016 struct extent_buffer *buf, int record_parent);
2017 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2018 struct extent_buffer *buf, int record_parent);
2019 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2020 struct btrfs_root *root,
2021 u64 bytenr, u64 num_bytes, u64 parent,
2022 u64 root_objectid, u64 owner, u64 offset);
2023 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2024 struct btrfs_root *root,
2025 struct extent_io_tree *unpin);
2026 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2027 struct btrfs_root *root,
2028 u64 bytenr, u64 num_bytes, u64 parent,
2029 u64 root_objectid, u64 ref_generation,
2030 u64 owner_objectid);
2031 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2032 struct btrfs_root *root, u64 bytenr,
2033 u64 orig_parent, u64 parent,
2034 u64 root_objectid, u64 ref_generation,
2035 u64 owner_objectid);
2036 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2037 struct btrfs_root *root);
2038 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2039 int btrfs_read_block_groups(struct btrfs_root *root);
2040 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2041 struct btrfs_root *root, u64 bytes_used,
2042 u64 type, u64 chunk_objectid, u64 chunk_offset,
2044 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
2045 struct btrfs_root *root);
2046 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
2047 struct btrfs_root *root, u64 bytenr, u64 num,
2048 int alloc, int mark_free);
2050 int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2051 struct btrfs_path *path, int level, int slot);
2052 int btrfs_check_node(struct btrfs_root *root,
2053 struct btrfs_disk_key *parent_key,
2054 struct extent_buffer *buf);
2055 int btrfs_check_leaf(struct btrfs_root *root,
2056 struct btrfs_disk_key *parent_key,
2057 struct extent_buffer *buf);
2058 int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
2059 struct btrfs_root *root);
2060 void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
2061 int level, int slot, u64 objectid);
2062 struct extent_buffer *read_node_slot(struct btrfs_root *root,
2063 struct extent_buffer *parent, int slot);
2064 int btrfs_previous_item(struct btrfs_root *root,
2065 struct btrfs_path *path, u64 min_objectid,
2067 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
2068 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2069 struct btrfs_root *root, struct extent_buffer *buf,
2070 struct extent_buffer *parent, int parent_slot,
2071 struct extent_buffer **cow_ret);
2072 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
2073 struct btrfs_root *root,
2074 struct extent_buffer *buf,
2075 struct extent_buffer *parent, int parent_slot,
2076 struct extent_buffer **cow_ret,
2077 u64 search_start, u64 empty_size);
2078 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2079 struct btrfs_root *root,
2080 struct extent_buffer *buf,
2081 struct extent_buffer **cow_ret, u64 new_root_objectid);
2082 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2083 *root, struct btrfs_path *path, u32 data_size);
2084 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2085 struct btrfs_root *root,
2086 struct btrfs_path *path,
2087 u32 new_size, int from_end);
2088 int btrfs_split_item(struct btrfs_trans_handle *trans,
2089 struct btrfs_root *root,
2090 struct btrfs_path *path,
2091 struct btrfs_key *new_key,
2092 unsigned long split_offset);
2093 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2094 *root, struct btrfs_key *key, struct btrfs_path *p, int
2096 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2097 struct btrfs_root *root, struct extent_buffer *parent,
2098 int start_slot, int cache_only, u64 *last_ret,
2099 struct btrfs_key *progress);
2100 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2101 struct btrfs_path *btrfs_alloc_path(void);
2102 void btrfs_free_path(struct btrfs_path *p);
2103 void btrfs_init_path(struct btrfs_path *p);
2104 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2105 struct btrfs_path *path, int slot, int nr);
2107 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2108 struct btrfs_root *root,
2109 struct btrfs_path *path)
2111 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2114 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2115 *root, struct btrfs_key *key, void *data, u32 data_size);
2116 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2117 struct btrfs_root *root,
2118 struct btrfs_path *path,
2119 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2121 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2122 struct btrfs_root *root,
2123 struct btrfs_path *path,
2124 struct btrfs_key *key,
2127 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2130 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2131 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2132 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2133 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
2135 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2136 struct btrfs_root *root, struct btrfs_path *path,
2137 struct btrfs_key *new_key);
2140 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2141 struct btrfs_root *tree_root,
2142 u64 root_id, u8 type, u64 ref_id,
2143 u64 dirid, u64 sequence,
2144 const char *name, int name_len);
2145 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2146 struct btrfs_key *key);
2147 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2148 *root, struct btrfs_key *key, struct btrfs_root_item
2150 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2151 *root, struct btrfs_key *key, struct btrfs_root_item
2153 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2154 btrfs_root_item *item, struct btrfs_key *key);
2155 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
2156 struct btrfs_root *latest_root);
2158 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
2159 *root, const char *name, int name_len, u64 dir,
2160 struct btrfs_key *location, u8 type, u64 index);
2161 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2162 struct btrfs_root *root,
2163 struct btrfs_path *path, u64 dir,
2164 const char *name, int name_len,
2166 struct btrfs_dir_item *
2167 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2168 struct btrfs_root *root,
2169 struct btrfs_path *path, u64 dir,
2170 u64 objectid, const char *name, int name_len,
2172 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2173 struct btrfs_path *path,
2174 const char *name, int name_len);
2175 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2176 struct btrfs_root *root,
2177 struct btrfs_path *path,
2178 struct btrfs_dir_item *di);
2179 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2180 struct btrfs_root *root, const char *name,
2181 u16 name_len, const void *data, u16 data_len,
2183 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2184 struct btrfs_root *root,
2185 struct btrfs_path *path, u64 dir,
2186 const char *name, u16 name_len,
2189 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2190 struct btrfs_root *fs_root,
2191 u64 dirid, u64 *objectid);
2192 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2195 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2196 struct btrfs_root *root,
2197 const char *name, int name_len,
2198 u64 inode_objectid, u64 ref_objectid, u64 index);
2199 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2200 struct btrfs_root *root,
2201 const char *name, int name_len,
2202 u64 inode_objectid, u64 ref_objectid);
2203 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2204 struct btrfs_root *root,
2205 struct btrfs_path *path, u64 objectid);
2206 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2207 *root, u64 objectid, struct btrfs_inode_item
2209 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2210 *root, struct btrfs_path *path,
2211 struct btrfs_key *location, int mod);
2214 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2215 struct btrfs_root *root, u64 bytenr, u64 len);
2216 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2217 struct btrfs_root *root,
2218 u64 objectid, u64 pos, u64 offset,
2221 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
2222 struct btrfs_root *root, u64 objectid,
2223 u64 offset, char *buffer, size_t size);
2224 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2225 struct btrfs_root *root,
2226 struct btrfs_path *path, u64 objectid,
2227 u64 bytenr, int mod);
2228 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
2229 struct btrfs_root *root, u64 alloc_end,
2230 u64 bytenr, char *data, size_t len);
2231 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2232 struct btrfs_root *root,
2233 struct btrfs_path *path,
2234 u64 bytenr, int cow);
2235 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2236 struct btrfs_root *root, struct btrfs_path *path,