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
143 * the key defines the order in the tree, and so it also defines (optimal)
144 * block layout. objectid corresonds to the inode number. The flags
145 * tells us things about the object, and is a kind of stream selector.
146 * so for a given inode, keys with flags of 1 might refer to the inode
147 * data, flags of 2 may point to file data in the btree and flags == 3
148 * may point to extents.
150 * offset is the starting byte offset for this key in the stream.
152 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
153 * in cpu native order. Otherwise they are identical and their sizes
154 * should be the same (ie both packed)
156 struct btrfs_disk_key {
160 } __attribute__ ((__packed__));
166 } __attribute__ ((__packed__));
168 struct btrfs_mapping_tree {
169 struct cache_tree cache_tree;
172 #define BTRFS_UUID_SIZE 16
173 struct btrfs_dev_item {
174 /* the internal btrfs device id */
177 /* size of the device */
183 /* optimal io alignment for this device */
186 /* optimal io width for this device */
189 /* minimal io size for this device */
192 /* type and info about this device */
195 /* expected generation for this device */
199 * starting byte of this partition on the device,
200 * to allowr for stripe alignment in the future
204 /* grouping information for allocation decisions */
207 /* seek speed 0-100 where 100 is fastest */
210 /* bandwidth 0-100 where 100 is fastest */
213 /* btrfs generated uuid for this device */
214 u8 uuid[BTRFS_UUID_SIZE];
216 /* uuid of FS who owns this device */
217 u8 fsid[BTRFS_UUID_SIZE];
218 } __attribute__ ((__packed__));
220 struct btrfs_stripe {
223 u8 dev_uuid[BTRFS_UUID_SIZE];
224 } __attribute__ ((__packed__));
227 /* size of this chunk in bytes */
230 /* objectid of the root referencing this chunk */
236 /* optimal io alignment for this chunk */
239 /* optimal io width for this chunk */
242 /* minimal io size for this chunk */
245 /* 2^16 stripes is quite a lot, a second limit is the size of a single
250 /* sub stripes only matter for raid10 */
252 struct btrfs_stripe stripe;
253 /* additional stripes go here */
254 } __attribute__ ((__packed__));
256 struct btrfs_free_space_header {
257 struct btrfs_disk_key location;
261 } __attribute__ ((__packed__));
263 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
265 BUG_ON(num_stripes == 0);
266 return sizeof(struct btrfs_chunk) +
267 sizeof(struct btrfs_stripe) * (num_stripes - 1);
270 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
271 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
272 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
273 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
275 #define BTRFS_BACKREF_REV_MAX 256
276 #define BTRFS_BACKREF_REV_SHIFT 56
277 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
278 BTRFS_BACKREF_REV_SHIFT)
280 #define BTRFS_OLD_BACKREF_REV 0
281 #define BTRFS_MIXED_BACKREF_REV 1
284 * every tree block (leaf or node) starts with this header.
286 struct btrfs_header {
287 /* these first four must match the super block */
288 u8 csum[BTRFS_CSUM_SIZE];
289 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
290 __le64 bytenr; /* which block this node is supposed to live in */
293 /* allowed to be different from the super from here on down */
294 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
299 } __attribute__ ((__packed__));
301 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
302 sizeof(struct btrfs_header)) / \
303 sizeof(struct btrfs_key_ptr))
304 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
305 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
306 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
307 sizeof(struct btrfs_item) - \
308 sizeof(struct btrfs_file_extent_item))
309 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
310 sizeof(struct btrfs_item) -\
311 sizeof(struct btrfs_dir_item))
315 * this is a very generous portion of the super block, giving us
316 * room to translate 14 chunks with 3 stripes each.
318 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
319 #define BTRFS_LABEL_SIZE 256
322 * just in case we somehow lose the roots and are not able to mount,
323 * we store an array of the roots from previous transactions
326 #define BTRFS_NUM_BACKUP_ROOTS 4
327 struct btrfs_root_backup {
329 __le64 tree_root_gen;
332 __le64 chunk_root_gen;
335 __le64 extent_root_gen;
344 __le64 csum_root_gen;
354 u8 extent_root_level;
358 /* future and to align */
360 } __attribute__ ((__packed__));
363 * the super block basically lists the main trees of the FS
364 * it currently lacks any block count etc etc
366 struct btrfs_super_block {
367 u8 csum[BTRFS_CSUM_SIZE];
368 /* the first 3 fields must match struct btrfs_header */
369 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
370 __le64 bytenr; /* this block number */
373 /* allowed to be different from the btrfs_header from here own down */
380 /* this will help find the new super based on the log root */
381 __le64 log_root_transid;
384 __le64 root_dir_objectid;
390 __le32 sys_chunk_array_size;
391 __le64 chunk_root_generation;
393 __le64 compat_ro_flags;
394 __le64 incompat_flags;
399 struct btrfs_dev_item dev_item;
401 char label[BTRFS_LABEL_SIZE];
403 __le64 cache_generation;
405 /* future expansion */
407 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
408 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
409 } __attribute__ ((__packed__));
412 * Compat flags that we support. If any incompat flags are set other than the
413 * ones specified below then we will fail to mount
415 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
416 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
417 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
418 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
420 * some patches floated around with a second compression method
421 * lets save that incompat here for when they do get in
422 * Note we don't actually support it, we're just reserving the
425 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
428 * older kernels tried to do bigger metadata blocks, but the
429 * code was pretty buggy. Lets not let them try anymore.
431 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
434 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
435 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
436 #define BTRFS_FEATURE_INCOMPAT_SUPP \
437 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
438 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
439 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
440 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
441 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
444 * A leaf is full of items. offset and size tell us where to find
445 * the item in the leaf (relative to the start of the data area)
448 struct btrfs_disk_key key;
451 } __attribute__ ((__packed__));
454 * leaves have an item area and a data area:
455 * [item0, item1....itemN] [free space] [dataN...data1, data0]
457 * The data is separate from the items to get the keys closer together
461 struct btrfs_header header;
462 struct btrfs_item items[];
463 } __attribute__ ((__packed__));
466 * all non-leaf blocks are nodes, they hold only keys and pointers to
469 struct btrfs_key_ptr {
470 struct btrfs_disk_key key;
473 } __attribute__ ((__packed__));
476 struct btrfs_header header;
477 struct btrfs_key_ptr ptrs[];
478 } __attribute__ ((__packed__));
481 * btrfs_paths remember the path taken from the root down to the leaf.
482 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
483 * to any other levels that are present.
485 * The slots array records the index of the item or block pointer
486 * used while walking the tree.
490 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
491 int slots[BTRFS_MAX_LEVEL];
492 /* if there is real range locking, this locks field will change */
493 int locks[BTRFS_MAX_LEVEL];
495 /* keep some upper locks as we walk down */
499 * set by btrfs_split_item, tells search_slot to keep all locks
500 * and to force calls to keep space in the nodes
502 unsigned int search_for_split:1;
503 unsigned int keep_locks:1;
504 unsigned int skip_locking:1;
505 unsigned int leave_spinning:1;
509 * items in the extent btree are used to record the objectid of the
510 * owner of the block and the number of references
513 struct btrfs_extent_item {
517 } __attribute__ ((__packed__));
519 struct btrfs_extent_item_v0 {
521 } __attribute__ ((__packed__));
523 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
524 sizeof(struct btrfs_item))
526 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
527 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
529 /* following flags only apply to tree blocks */
531 /* use full backrefs for extent pointers in the block*/
532 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
534 struct btrfs_tree_block_info {
535 struct btrfs_disk_key key;
537 } __attribute__ ((__packed__));
539 struct btrfs_extent_data_ref {
544 } __attribute__ ((__packed__));
546 struct btrfs_shared_data_ref {
548 } __attribute__ ((__packed__));
550 struct btrfs_extent_inline_ref {
553 } __attribute__ ((__packed__));
555 struct btrfs_extent_ref_v0 {
560 } __attribute__ ((__packed__));
562 /* dev extents record free space on individual devices. The owner
563 * field points back to the chunk allocation mapping tree that allocated
564 * the extent. The chunk tree uuid field is a way to double check the owner
566 struct btrfs_dev_extent {
568 __le64 chunk_objectid;
571 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
572 } __attribute__ ((__packed__));
574 struct btrfs_inode_ref {
578 } __attribute__ ((__packed__));
580 struct btrfs_timespec {
583 } __attribute__ ((__packed__));
586 BTRFS_COMPRESS_NONE = 0,
587 BTRFS_COMPRESS_ZLIB = 1,
588 BTRFS_COMPRESS_LZO = 2,
589 BTRFS_COMPRESS_TYPES = 2,
590 BTRFS_COMPRESS_LAST = 3,
591 } btrfs_compression_type;
593 /* we don't understand any encryption methods right now */
595 BTRFS_ENCRYPTION_NONE = 0,
596 BTRFS_ENCRYPTION_LAST = 1,
597 } btrfs_encryption_type;
599 struct btrfs_inode_item {
600 /* nfs style generation number */
602 /* transid that last touched this inode */
614 /* modification sequence number for NFS */
618 * a little future expansion, for more than this we can
619 * just grow the inode item and version it
622 struct btrfs_timespec atime;
623 struct btrfs_timespec ctime;
624 struct btrfs_timespec mtime;
625 struct btrfs_timespec otime;
626 } __attribute__ ((__packed__));
628 struct btrfs_dir_log_item {
630 } __attribute__ ((__packed__));
632 struct btrfs_dir_item {
633 struct btrfs_disk_key location;
638 } __attribute__ ((__packed__));
640 struct btrfs_root_item_v0 {
641 struct btrfs_inode_item inode;
647 __le64 last_snapshot;
650 struct btrfs_disk_key drop_progress;
653 } __attribute__ ((__packed__));
655 struct btrfs_root_item {
656 struct btrfs_inode_item inode;
662 __le64 last_snapshot;
665 struct btrfs_disk_key drop_progress;
670 * The following fields appear after subvol_uuids+subvol_times
675 * This generation number is used to test if the new fields are valid
676 * and up to date while reading the root item. Everytime the root item
677 * is written out, the "generation" field is copied into this field. If
678 * anyone ever mounted the fs with an older kernel, we will have
679 * mismatching generation values here and thus must invalidate the
680 * new fields. See btrfs_update_root and btrfs_find_last_root for
682 * the offset of generation_v2 is also used as the start for the memset
683 * when invalidating the fields.
685 __le64 generation_v2;
686 u8 uuid[BTRFS_UUID_SIZE];
687 u8 parent_uuid[BTRFS_UUID_SIZE];
688 u8 received_uuid[BTRFS_UUID_SIZE];
689 __le64 ctransid; /* updated when an inode changes */
690 __le64 otransid; /* trans when created */
691 __le64 stransid; /* trans when sent. non-zero for received subvol */
692 __le64 rtransid; /* trans when received. non-zero for received subvol */
693 struct btrfs_timespec ctime;
694 struct btrfs_timespec otime;
695 struct btrfs_timespec stime;
696 struct btrfs_timespec rtime;
697 __le64 reserved[8]; /* for future */
698 } __attribute__ ((__packed__));
701 * this is used for both forward and backward root refs
703 struct btrfs_root_ref {
707 } __attribute__ ((__packed__));
709 #define BTRFS_FILE_EXTENT_INLINE 0
710 #define BTRFS_FILE_EXTENT_REG 1
711 #define BTRFS_FILE_EXTENT_PREALLOC 2
713 struct btrfs_file_extent_item {
715 * transaction id that created this extent
719 * max number of bytes to hold this extent in ram
720 * when we split a compressed extent we can't know how big
721 * each of the resulting pieces will be. So, this is
722 * an upper limit on the size of the extent in ram instead of
728 * 32 bits for the various ways we might encode the data,
729 * including compression and encryption. If any of these
730 * are set to something a given disk format doesn't understand
731 * it is treated like an incompat flag for reading and writing,
736 __le16 other_encoding; /* spare for later use */
738 /* are we inline data or a real extent? */
742 * disk space consumed by the extent, checksum blocks are included
746 __le64 disk_num_bytes;
748 * the logical offset in file blocks (no csums)
749 * this extent record is for. This allows a file extent to point
750 * into the middle of an existing extent on disk, sharing it
751 * between two snapshots (useful if some bytes in the middle of the
752 * extent have changed
756 * the logical number of file blocks (no csums included)
760 } __attribute__ ((__packed__));
762 struct btrfs_csum_item {
764 } __attribute__ ((__packed__));
766 /* tag for the radix tree of block groups in ram */
767 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
768 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
769 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
770 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
771 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
772 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
773 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
774 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
776 /* used in struct btrfs_balance_args fields */
777 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
779 #define BTRFS_QGROUP_STATUS_OFF 0
780 #define BTRFS_QGROUP_STATUS_ON 1
781 #define BTRFS_QGROUP_STATUS_SCANNING 2
783 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1 << 0)
785 struct btrfs_qgroup_status_item {
789 __le64 scan; /* progress during scanning */
790 } __attribute__ ((__packed__));
792 struct btrfs_block_group_item {
794 __le64 chunk_objectid;
796 } __attribute__ ((__packed__));
798 struct btrfs_qgroup_info_item {
801 __le64 referenced_compressed;
803 __le64 exclusive_compressed;
804 } __attribute__ ((__packed__));
806 /* flags definition for qgroup limits */
807 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
808 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
809 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
810 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
811 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
812 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
814 struct btrfs_qgroup_limit_item {
816 __le64 max_referenced;
817 __le64 max_exclusive;
818 __le64 rsv_referenced;
819 __le64 rsv_exclusive;
820 } __attribute__ ((__packed__));
822 struct btrfs_space_info {
828 struct list_head list;
831 struct btrfs_block_group_cache {
832 struct cache_extent cache;
833 struct btrfs_key key;
834 struct btrfs_block_group_item item;
835 struct btrfs_space_info *space_info;
842 struct btrfs_extent_ops {
843 int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
844 u64 hint_byte, struct btrfs_key *ins);
845 int (*free_extent)(struct btrfs_root *root, u64 bytenr,
850 struct btrfs_fs_devices;
851 struct btrfs_fs_info {
852 u8 fsid[BTRFS_FSID_SIZE];
853 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
854 struct btrfs_root *fs_root;
855 struct btrfs_root *extent_root;
856 struct btrfs_root *tree_root;
857 struct btrfs_root *chunk_root;
858 struct btrfs_root *dev_root;
859 struct btrfs_root *csum_root;
861 struct cache_tree fs_root_cache;
863 /* the log root tree is a directory of all the other log roots */
864 struct btrfs_root *log_root_tree;
866 struct extent_io_tree extent_cache;
867 struct extent_io_tree free_space_cache;
868 struct extent_io_tree block_group_cache;
869 struct extent_io_tree pinned_extents;
870 struct extent_io_tree pending_del;
871 struct extent_io_tree extent_ins;
873 /* logical->physical extent mapping */
874 struct btrfs_mapping_tree mapping_tree;
877 u64 last_trans_committed;
879 u64 avail_data_alloc_bits;
880 u64 avail_metadata_alloc_bits;
881 u64 avail_system_alloc_bits;
882 u64 data_alloc_profile;
883 u64 metadata_alloc_profile;
884 u64 system_alloc_profile;
887 struct btrfs_trans_handle *running_transaction;
888 struct btrfs_super_block super_copy;
889 struct mutex fs_mutex;
894 struct btrfs_extent_ops *extent_ops;
895 struct list_head dirty_cowonly_roots;
897 struct btrfs_fs_devices *fs_devices;
898 struct list_head space_info;
901 int (*free_extent_hook)(struct btrfs_trans_handle *trans,
902 struct btrfs_root *root,
903 u64 bytenr, u64 num_bytes, u64 parent,
904 u64 root_objectid, u64 owner, u64 offset,
906 struct cache_tree *fsck_extent_cache;
907 struct cache_tree *corrupt_blocks;
911 * in ram representation of the tree. extent_root is used for all allocations
912 * and for the extent tree extent_root root.
915 struct extent_buffer *node;
916 struct extent_buffer *commit_root;
917 struct btrfs_root_item root_item;
918 struct btrfs_key root_key;
919 struct btrfs_fs_info *fs_info;
923 /* data allocations are done in sectorsize units */
926 /* node allocations are done in nodesize units */
929 /* leaf allocations are done in leafsize units */
932 /* leaf allocations are done in leafsize units */
941 u64 last_inode_alloc;
943 /* the dirty list is only used by non-reference counted roots */
944 struct list_head dirty_list;
945 struct cache_extent cache;
949 * inode items have the data typically returned from stat and store other
950 * info about object characteristics. There is one for every file and dir in
953 #define BTRFS_INODE_ITEM_KEY 1
954 #define BTRFS_INODE_REF_KEY 12
955 #define BTRFS_XATTR_ITEM_KEY 24
956 #define BTRFS_ORPHAN_ITEM_KEY 48
958 #define BTRFS_DIR_LOG_ITEM_KEY 60
959 #define BTRFS_DIR_LOG_INDEX_KEY 72
961 * dir items are the name -> inode pointers in a directory. There is one
962 * for every name in a directory.
964 #define BTRFS_DIR_ITEM_KEY 84
965 #define BTRFS_DIR_INDEX_KEY 96
968 * extent data is for file data
970 #define BTRFS_EXTENT_DATA_KEY 108
973 * csum items have the checksums for data in the extents
975 #define BTRFS_CSUM_ITEM_KEY 120
977 * extent csums are stored in a separate tree and hold csums for
978 * an entire extent on disk.
980 #define BTRFS_EXTENT_CSUM_KEY 128
983 * root items point to tree roots. There are typically in the root
984 * tree used by the super block to find all the other trees
986 #define BTRFS_ROOT_ITEM_KEY 132
989 * root backrefs tie subvols and snapshots to the directory entries that
992 #define BTRFS_ROOT_BACKREF_KEY 144
995 * root refs make a fast index for listing all of the snapshots and
996 * subvolumes referenced by a given root. They point directly to the
997 * directory item in the root that references the subvol
999 #define BTRFS_ROOT_REF_KEY 156
1002 * extent items are in the extent map tree. These record which blocks
1003 * are used, and how many references there are to each block
1005 #define BTRFS_EXTENT_ITEM_KEY 168
1007 #define BTRFS_TREE_BLOCK_REF_KEY 176
1009 #define BTRFS_EXTENT_DATA_REF_KEY 178
1011 /* old style extent backrefs */
1012 #define BTRFS_EXTENT_REF_V0_KEY 180
1014 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1016 #define BTRFS_SHARED_DATA_REF_KEY 184
1020 * block groups give us hints into the extent allocation trees. Which
1021 * blocks are free etc etc
1023 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1025 #define BTRFS_DEV_EXTENT_KEY 204
1026 #define BTRFS_DEV_ITEM_KEY 216
1027 #define BTRFS_CHUNK_ITEM_KEY 228
1029 #define BTRFS_BALANCE_ITEM_KEY 248
1034 #define BTRFS_QGROUP_STATUS_KEY 240
1035 #define BTRFS_QGROUP_INFO_KEY 242
1036 #define BTRFS_QGROUP_LIMIT_KEY 244
1037 #define BTRFS_QGROUP_RELATION_KEY 246
1040 * string items are for debugging. They just store a short string of
1043 #define BTRFS_STRING_ITEM_KEY 253
1047 #define BTRFS_INODE_NODATASUM (1 << 0)
1048 #define BTRFS_INODE_NODATACOW (1 << 1)
1049 #define BTRFS_INODE_READONLY (1 << 2)
1051 #define read_eb_member(eb, ptr, type, member, result) ( \
1052 read_extent_buffer(eb, (char *)(result), \
1053 ((unsigned long)(ptr)) + \
1054 offsetof(type, member), \
1055 sizeof(((type *)0)->member)))
1057 #define write_eb_member(eb, ptr, type, member, result) ( \
1058 write_extent_buffer(eb, (char *)(result), \
1059 ((unsigned long)(ptr)) + \
1060 offsetof(type, member), \
1061 sizeof(((type *)0)->member)))
1063 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1064 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1066 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1067 return le##bits##_to_cpu(h->member); \
1069 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1072 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1073 h->member = cpu_to_le##bits(val); \
1076 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1077 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
1080 unsigned long offset = (unsigned long)s; \
1081 type *p = (type *) (eb->data + offset); \
1082 return le##bits##_to_cpu(p->member); \
1084 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1085 type *s, u##bits val) \
1087 unsigned long offset = (unsigned long)s; \
1088 type *p = (type *) (eb->data + offset); \
1089 p->member = cpu_to_le##bits(val); \
1092 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1093 static inline u##bits btrfs_##name(type *s) \
1095 return le##bits##_to_cpu(s->member); \
1097 static inline void btrfs_set_##name(type *s, u##bits val) \
1099 s->member = cpu_to_le##bits(val); \
1102 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1103 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1104 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1105 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1106 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1107 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1109 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1110 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1111 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1112 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1113 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1114 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1116 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1117 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1119 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1121 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1123 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1125 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1127 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1128 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1130 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1132 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1134 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1137 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1139 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1142 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1144 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1147 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1148 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1149 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1150 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1151 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1152 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1153 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1154 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1155 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1156 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1157 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1159 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1161 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1164 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1165 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1166 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1168 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1170 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1172 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1174 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1175 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1177 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1179 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1180 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1182 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1185 unsigned long offset = (unsigned long)c;
1186 offset += offsetof(struct btrfs_chunk, stripe);
1187 offset += nr * sizeof(struct btrfs_stripe);
1188 return (struct btrfs_stripe *)offset;
1191 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1193 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1196 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1197 struct btrfs_chunk *c, int nr)
1199 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1202 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1203 struct btrfs_chunk *c, int nr,
1206 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1209 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1210 struct btrfs_chunk *c, int nr)
1212 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1215 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1216 struct btrfs_chunk *c, int nr,
1219 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1222 /* struct btrfs_block_group_item */
1223 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1225 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1227 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1228 struct btrfs_block_group_item, chunk_objectid, 64);
1230 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1231 struct btrfs_block_group_item, chunk_objectid, 64);
1232 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1233 struct btrfs_block_group_item, flags, 64);
1234 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1235 struct btrfs_block_group_item, flags, 64);
1237 /* struct btrfs_inode_ref */
1238 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1239 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1240 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1242 /* struct btrfs_inode_item */
1243 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1244 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1245 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1246 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1247 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1248 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1249 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1250 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1251 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1252 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1253 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1254 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1256 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1257 struct btrfs_inode_item, generation, 64);
1258 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1259 struct btrfs_inode_item, generation, 64);
1260 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1261 struct btrfs_inode_item, size, 64);
1262 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1263 struct btrfs_inode_item, nbytes, 64);
1264 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1265 struct btrfs_inode_item, block_group, 64);
1266 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1267 struct btrfs_inode_item, nlink, 32);
1268 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1269 struct btrfs_inode_item, uid, 32);
1270 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1271 struct btrfs_inode_item, gid, 32);
1272 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1273 struct btrfs_inode_item, mode, 32);
1274 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1275 struct btrfs_inode_item, rdev, 64);
1276 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1277 struct btrfs_inode_item, flags, 64);
1279 static inline struct btrfs_timespec *
1280 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1282 unsigned long ptr = (unsigned long)inode_item;
1283 ptr += offsetof(struct btrfs_inode_item, atime);
1284 return (struct btrfs_timespec *)ptr;
1287 static inline struct btrfs_timespec *
1288 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1290 unsigned long ptr = (unsigned long)inode_item;
1291 ptr += offsetof(struct btrfs_inode_item, mtime);
1292 return (struct btrfs_timespec *)ptr;
1295 static inline struct btrfs_timespec *
1296 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1298 unsigned long ptr = (unsigned long)inode_item;
1299 ptr += offsetof(struct btrfs_inode_item, ctime);
1300 return (struct btrfs_timespec *)ptr;
1303 static inline struct btrfs_timespec *
1304 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1306 unsigned long ptr = (unsigned long)inode_item;
1307 ptr += offsetof(struct btrfs_inode_item, otime);
1308 return (struct btrfs_timespec *)ptr;
1311 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1312 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1313 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1315 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1318 /* struct btrfs_dev_extent */
1319 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1321 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1322 chunk_objectid, 64);
1323 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1325 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1327 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1329 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1330 return (u8 *)((unsigned long)dev + ptr);
1334 /* struct btrfs_extent_item */
1335 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1336 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1338 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1340 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1342 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1344 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1345 struct btrfs_tree_block_info *item,
1346 struct btrfs_disk_key *key)
1348 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1351 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1352 struct btrfs_tree_block_info *item,
1353 struct btrfs_disk_key *key)
1355 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1358 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1360 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1362 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1364 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1367 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1370 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1372 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1375 static inline u32 btrfs_extent_inline_ref_size(int type)
1377 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1378 type == BTRFS_SHARED_BLOCK_REF_KEY)
1379 return sizeof(struct btrfs_extent_inline_ref);
1380 if (type == BTRFS_SHARED_DATA_REF_KEY)
1381 return sizeof(struct btrfs_shared_data_ref) +
1382 sizeof(struct btrfs_extent_inline_ref);
1383 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1384 return sizeof(struct btrfs_extent_data_ref) +
1385 offsetof(struct btrfs_extent_inline_ref, offset);
1390 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1391 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1393 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1394 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1396 /* struct btrfs_node */
1397 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1398 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1400 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1403 ptr = offsetof(struct btrfs_node, ptrs) +
1404 sizeof(struct btrfs_key_ptr) * nr;
1405 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1408 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1412 ptr = offsetof(struct btrfs_node, ptrs) +
1413 sizeof(struct btrfs_key_ptr) * nr;
1414 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1417 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1420 ptr = offsetof(struct btrfs_node, ptrs) +
1421 sizeof(struct btrfs_key_ptr) * nr;
1422 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1425 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1429 ptr = offsetof(struct btrfs_node, ptrs) +
1430 sizeof(struct btrfs_key_ptr) * nr;
1431 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1434 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1436 return offsetof(struct btrfs_node, ptrs) +
1437 sizeof(struct btrfs_key_ptr) * nr;
1440 static inline void btrfs_node_key(struct extent_buffer *eb,
1441 struct btrfs_disk_key *disk_key, int nr)
1444 ptr = btrfs_node_key_ptr_offset(nr);
1445 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1446 struct btrfs_key_ptr, key, disk_key);
1449 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1450 struct btrfs_disk_key *disk_key, int nr)
1453 ptr = btrfs_node_key_ptr_offset(nr);
1454 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1455 struct btrfs_key_ptr, key, disk_key);
1458 /* struct btrfs_item */
1459 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1460 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1462 static inline unsigned long btrfs_item_nr_offset(int nr)
1464 return offsetof(struct btrfs_leaf, items) +
1465 sizeof(struct btrfs_item) * nr;
1468 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1471 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1474 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1475 struct btrfs_item *item)
1477 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1480 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1482 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1485 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1487 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1490 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1492 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1495 static inline void btrfs_item_key(struct extent_buffer *eb,
1496 struct btrfs_disk_key *disk_key, int nr)
1498 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1499 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1502 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1503 struct btrfs_disk_key *disk_key, int nr)
1505 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1506 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1509 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1512 * struct btrfs_root_ref
1514 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1515 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1516 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1518 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1519 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1520 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1522 /* struct btrfs_dir_item */
1523 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1524 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1525 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1526 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1528 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1530 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1531 struct btrfs_dir_item *item,
1532 struct btrfs_disk_key *key)
1534 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1537 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1538 struct btrfs_dir_item *item,
1539 struct btrfs_disk_key *key)
1541 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1544 /* struct btrfs_free_space_header */
1545 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1547 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1549 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1552 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1553 struct btrfs_free_space_header *h,
1554 struct btrfs_disk_key *key)
1556 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1559 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1560 struct btrfs_free_space_header *h,
1561 struct btrfs_disk_key *key)
1563 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1566 /* struct btrfs_disk_key */
1567 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1569 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1570 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1572 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1573 struct btrfs_disk_key *disk)
1575 cpu->offset = le64_to_cpu(disk->offset);
1576 cpu->type = disk->type;
1577 cpu->objectid = le64_to_cpu(disk->objectid);
1580 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1581 struct btrfs_key *cpu)
1583 disk->offset = cpu_to_le64(cpu->offset);
1584 disk->type = cpu->type;
1585 disk->objectid = cpu_to_le64(cpu->objectid);
1588 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1589 struct btrfs_key *key, int nr)
1591 struct btrfs_disk_key disk_key;
1592 btrfs_node_key(eb, &disk_key, nr);
1593 btrfs_disk_key_to_cpu(key, &disk_key);
1596 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1597 struct btrfs_key *key, int nr)
1599 struct btrfs_disk_key disk_key;
1600 btrfs_item_key(eb, &disk_key, nr);
1601 btrfs_disk_key_to_cpu(key, &disk_key);
1604 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1605 struct btrfs_dir_item *item,
1606 struct btrfs_key *key)
1608 struct btrfs_disk_key disk_key;
1609 btrfs_dir_item_key(eb, item, &disk_key);
1610 btrfs_disk_key_to_cpu(key, &disk_key);
1614 static inline u8 btrfs_key_type(struct btrfs_key *key)
1619 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1624 /* struct btrfs_header */
1625 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1626 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1628 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1629 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1630 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1631 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1633 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1635 return (btrfs_header_flags(eb) & flag) == flag;
1638 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1640 u64 flags = btrfs_header_flags(eb);
1641 btrfs_set_header_flags(eb, flags | flag);
1642 return (flags & flag) == flag;
1645 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1647 u64 flags = btrfs_header_flags(eb);
1648 btrfs_set_header_flags(eb, flags & ~flag);
1649 return (flags & flag) == flag;
1652 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1654 u64 flags = btrfs_header_flags(eb);
1655 return flags >> BTRFS_BACKREF_REV_SHIFT;
1658 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1661 u64 flags = btrfs_header_flags(eb);
1662 flags &= ~BTRFS_BACKREF_REV_MASK;
1663 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1664 btrfs_set_header_flags(eb, flags);
1667 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1669 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1673 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1675 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1679 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1681 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1685 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1687 unsigned long ptr = offsetof(struct btrfs_header, csum);
1691 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1696 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1701 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1706 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1708 return (btrfs_header_level(eb) == 0);
1711 /* struct btrfs_root_item */
1712 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1714 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1715 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1716 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1718 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1720 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1721 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1722 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1723 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1724 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1725 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1726 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1727 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1729 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
1731 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
1733 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
1735 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
1737 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
1740 /* struct btrfs_root_backup */
1741 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
1743 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
1745 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
1746 tree_root_level, 8);
1748 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
1750 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
1751 chunk_root_gen, 64);
1752 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
1753 chunk_root_level, 8);
1755 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
1757 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
1758 extent_root_gen, 64);
1759 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
1760 extent_root_level, 8);
1762 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
1764 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
1766 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
1769 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
1771 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
1773 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
1776 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
1778 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
1780 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
1781 csum_root_level, 8);
1782 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
1784 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
1786 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
1789 /* struct btrfs_super_block */
1791 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1792 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1793 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1795 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1796 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1797 struct btrfs_super_block, sys_chunk_array_size, 32);
1798 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1799 struct btrfs_super_block, chunk_root_generation, 64);
1800 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1802 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1804 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1805 chunk_root_level, 8);
1806 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1808 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1809 log_root_transid, 64);
1810 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1812 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1814 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1816 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1818 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1820 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1822 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1824 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1825 root_dir_objectid, 64);
1826 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1828 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1830 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1832 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1833 incompat_flags, 64);
1834 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1836 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
1837 cache_generation, 64);
1839 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1841 int t = btrfs_super_csum_type(s);
1842 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1843 return btrfs_csum_sizes[t];
1846 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1848 return offsetof(struct btrfs_leaf, items);
1851 /* struct btrfs_file_extent_item */
1852 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1853 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
1855 static inline unsigned long btrfs_file_extent_inline_start(struct
1856 btrfs_file_extent_item *e)
1858 unsigned long offset = (unsigned long)e;
1859 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1863 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1865 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1868 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1870 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
1872 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1874 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
1876 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1877 disk_num_bytes, 64);
1878 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1880 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
1882 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1884 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
1886 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1888 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
1890 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1892 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
1894 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1896 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1897 other_encoding, 16);
1899 /* btrfs_qgroup_status_item */
1900 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
1902 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
1904 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
1906 BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
1909 /* btrfs_qgroup_info_item */
1910 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
1912 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
1914 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
1915 struct btrfs_qgroup_info_item, referenced_compressed, 64);
1916 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
1918 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
1919 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
1921 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
1922 struct btrfs_qgroup_info_item, generation, 64);
1923 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
1924 struct btrfs_qgroup_info_item, referenced, 64);
1925 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
1926 struct btrfs_qgroup_info_item, referenced_compressed, 64);
1927 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
1928 struct btrfs_qgroup_info_item, exclusive, 64);
1929 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
1930 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
1932 /* btrfs_qgroup_limit_item */
1933 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
1935 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
1936 max_referenced, 64);
1937 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
1939 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
1940 rsv_referenced, 64);
1941 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
1944 /* this returns the number of file bytes represented by the inline item.
1945 * If an item is compressed, this is the uncompressed size
1947 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1948 struct btrfs_file_extent_item *e)
1950 return btrfs_file_extent_ram_bytes(eb, e);
1954 * this returns the number of bytes used by the item on disk, minus the
1955 * size of any extent headers. If a file is compressed on disk, this is
1956 * the compressed size
1958 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1959 struct btrfs_item *e)
1961 unsigned long offset;
1962 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1963 return btrfs_item_size(eb, e) - offset;
1966 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1968 return root->leafsize;
1969 return root->nodesize;
1972 /* helper function to cast into the data area of the leaf. */
1973 #define btrfs_item_ptr(leaf, slot, type) \
1974 ((type *)(btrfs_leaf_data(leaf) + \
1975 btrfs_item_offset_nr(leaf, slot)))
1977 #define btrfs_item_ptr_offset(leaf, slot) \
1978 ((unsigned long)(btrfs_leaf_data(leaf) + \
1979 btrfs_item_offset_nr(leaf, slot)))
1982 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
1983 struct btrfs_root *root);
1984 int btrfs_check_block_accounting(struct btrfs_root *root);
1985 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
1986 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1987 struct btrfs_root *root);
1988 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1989 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1990 btrfs_fs_info *info,
1992 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1993 struct btrfs_block_group_cache
1994 *hint, u64 search_start,
1995 int data, int owner);
1996 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1997 struct btrfs_root *root,
1998 u32 blocksize, u64 root_objectid,
1999 struct btrfs_disk_key *key, int level,
2000 u64 hint, u64 empty_size);
2001 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
2002 struct btrfs_root *root,
2003 u64 num_bytes, u64 parent,
2004 u64 root_objectid, u64 ref_generation,
2005 u64 owner, u64 empty_size, u64 hint_byte,
2006 u64 search_end, struct btrfs_key *ins, int data);
2007 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2008 struct btrfs_root *root, u64 bytenr,
2009 u64 num_bytes, u64 *refs, u64 *flags);
2010 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
2011 struct btrfs_root *root,
2012 u64 bytenr, u64 num_bytes, u64 flags);
2013 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2014 struct extent_buffer *buf, int record_parent);
2015 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2016 struct extent_buffer *buf, int record_parent);
2017 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2018 struct btrfs_root *root,
2019 u64 bytenr, u64 num_bytes, u64 parent,
2020 u64 root_objectid, u64 owner, u64 offset);
2021 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2022 struct btrfs_root *root,
2023 struct extent_io_tree *unpin);
2024 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2025 struct btrfs_root *root,
2026 u64 bytenr, u64 num_bytes, u64 parent,
2027 u64 root_objectid, u64 ref_generation,
2028 u64 owner_objectid);
2029 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2030 struct btrfs_root *root, u64 bytenr,
2031 u64 orig_parent, u64 parent,
2032 u64 root_objectid, u64 ref_generation,
2033 u64 owner_objectid);
2034 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2035 struct btrfs_root *root);
2036 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2037 int btrfs_read_block_groups(struct btrfs_root *root);
2038 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2039 struct btrfs_root *root, u64 bytes_used,
2040 u64 type, u64 chunk_objectid, u64 chunk_offset,
2042 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
2043 struct btrfs_root *root);
2044 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
2045 struct btrfs_root *root, u64 bytenr, u64 num,
2046 int alloc, int mark_free);
2048 int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2049 struct btrfs_path *path, int level, int slot);
2050 int btrfs_check_node(struct btrfs_root *root,
2051 struct btrfs_disk_key *parent_key,
2052 struct extent_buffer *buf);
2053 int btrfs_check_leaf(struct btrfs_root *root,
2054 struct btrfs_disk_key *parent_key,
2055 struct extent_buffer *buf);
2056 int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
2057 struct btrfs_root *root);
2058 void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
2059 int level, int slot, u64 objectid);
2060 struct extent_buffer *read_node_slot(struct btrfs_root *root,
2061 struct extent_buffer *parent, int slot);
2062 int btrfs_previous_item(struct btrfs_root *root,
2063 struct btrfs_path *path, u64 min_objectid,
2065 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
2066 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2067 struct btrfs_root *root, struct extent_buffer *buf,
2068 struct extent_buffer *parent, int parent_slot,
2069 struct extent_buffer **cow_ret);
2070 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
2071 struct btrfs_root *root,
2072 struct extent_buffer *buf,
2073 struct extent_buffer *parent, int parent_slot,
2074 struct extent_buffer **cow_ret,
2075 u64 search_start, u64 empty_size);
2076 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2077 struct btrfs_root *root,
2078 struct extent_buffer *buf,
2079 struct extent_buffer **cow_ret, u64 new_root_objectid);
2080 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2081 *root, struct btrfs_path *path, u32 data_size);
2082 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2083 struct btrfs_root *root,
2084 struct btrfs_path *path,
2085 u32 new_size, int from_end);
2086 int btrfs_split_item(struct btrfs_trans_handle *trans,
2087 struct btrfs_root *root,
2088 struct btrfs_path *path,
2089 struct btrfs_key *new_key,
2090 unsigned long split_offset);
2091 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2092 *root, struct btrfs_key *key, struct btrfs_path *p, int
2094 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2095 struct btrfs_root *root, struct extent_buffer *parent,
2096 int start_slot, int cache_only, u64 *last_ret,
2097 struct btrfs_key *progress);
2098 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2099 struct btrfs_path *btrfs_alloc_path(void);
2100 void btrfs_free_path(struct btrfs_path *p);
2101 void btrfs_init_path(struct btrfs_path *p);
2102 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2103 struct btrfs_path *path, int slot, int nr);
2105 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2106 struct btrfs_root *root,
2107 struct btrfs_path *path)
2109 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2112 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2113 *root, struct btrfs_key *key, void *data, u32 data_size);
2114 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2115 struct btrfs_root *root,
2116 struct btrfs_path *path,
2117 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2119 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2120 struct btrfs_root *root,
2121 struct btrfs_path *path,
2122 struct btrfs_key *key,
2125 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2128 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2129 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2130 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2131 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
2133 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2134 struct btrfs_root *root, struct btrfs_path *path,
2135 struct btrfs_key *new_key);
2138 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2139 struct btrfs_root *tree_root,
2140 u64 root_id, u8 type, u64 ref_id,
2141 u64 dirid, u64 sequence,
2142 const char *name, int name_len);
2143 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2144 struct btrfs_key *key);
2145 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2146 *root, struct btrfs_key *key, struct btrfs_root_item
2148 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2149 *root, struct btrfs_key *key, struct btrfs_root_item
2151 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2152 btrfs_root_item *item, struct btrfs_key *key);
2153 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
2154 struct btrfs_root *latest_root);
2156 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
2157 *root, const char *name, int name_len, u64 dir,
2158 struct btrfs_key *location, u8 type, u64 index);
2159 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2160 struct btrfs_root *root,
2161 struct btrfs_path *path, u64 dir,
2162 const char *name, int name_len,
2164 struct btrfs_dir_item *
2165 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2166 struct btrfs_root *root,
2167 struct btrfs_path *path, u64 dir,
2168 u64 objectid, const char *name, int name_len,
2170 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2171 struct btrfs_path *path,
2172 const char *name, int name_len);
2173 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2174 struct btrfs_root *root,
2175 struct btrfs_path *path,
2176 struct btrfs_dir_item *di);
2177 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2178 struct btrfs_root *root, const char *name,
2179 u16 name_len, const void *data, u16 data_len,
2181 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2182 struct btrfs_root *root,
2183 struct btrfs_path *path, u64 dir,
2184 const char *name, u16 name_len,
2187 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2188 struct btrfs_root *fs_root,
2189 u64 dirid, u64 *objectid);
2190 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2193 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2194 struct btrfs_root *root,
2195 const char *name, int name_len,
2196 u64 inode_objectid, u64 ref_objectid, u64 index);
2197 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2198 struct btrfs_root *root,
2199 const char *name, int name_len,
2200 u64 inode_objectid, u64 ref_objectid);
2201 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2202 struct btrfs_root *root,
2203 struct btrfs_path *path, u64 objectid);
2204 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2205 *root, u64 objectid, struct btrfs_inode_item
2207 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2208 *root, struct btrfs_path *path,
2209 struct btrfs_key *location, int mod);
2212 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2213 struct btrfs_root *root, u64 bytenr, u64 len);
2214 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2215 struct btrfs_root *root,
2216 u64 objectid, u64 pos, u64 offset,
2219 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
2220 struct btrfs_root *root, u64 objectid,
2221 u64 offset, char *buffer, size_t size);
2222 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2223 struct btrfs_root *root,
2224 struct btrfs_path *path, u64 objectid,
2225 u64 bytenr, int mod);
2226 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
2227 struct btrfs_root *root, u64 alloc_end,
2228 u64 bytenr, char *data, size_t len);
2229 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2230 struct btrfs_root *root,
2231 struct btrfs_path *path,
2232 u64 bytenr, int cow);
2233 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2234 struct btrfs_root *root, struct btrfs_path *path,