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 * the max metadata block size. This limit is somewhat artificial,
115 * but the memmove costs go through the roof for larger blocks.
117 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
120 * we can actually store much bigger names, but lets not confuse the rest
123 #define BTRFS_NAME_LEN 255
125 /* 32 bytes in various csum fields */
126 #define BTRFS_CSUM_SIZE 32
129 #define BTRFS_CSUM_TYPE_CRC32 0
131 static int btrfs_csum_sizes[] = { 4, 0 };
133 /* four bytes for CRC32 */
134 #define BTRFS_CRC32_SIZE 4
135 #define BTRFS_EMPTY_DIR_SIZE 0
137 #define BTRFS_FT_UNKNOWN 0
138 #define BTRFS_FT_REG_FILE 1
139 #define BTRFS_FT_DIR 2
140 #define BTRFS_FT_CHRDEV 3
141 #define BTRFS_FT_BLKDEV 4
142 #define BTRFS_FT_FIFO 5
143 #define BTRFS_FT_SOCK 6
144 #define BTRFS_FT_SYMLINK 7
145 #define BTRFS_FT_XATTR 8
146 #define BTRFS_FT_MAX 9
148 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
151 * the key defines the order in the tree, and so it also defines (optimal)
152 * block layout. objectid corresonds to the inode number. The flags
153 * tells us things about the object, and is a kind of stream selector.
154 * so for a given inode, keys with flags of 1 might refer to the inode
155 * data, flags of 2 may point to file data in the btree and flags == 3
156 * may point to extents.
158 * offset is the starting byte offset for this key in the stream.
160 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
161 * in cpu native order. Otherwise they are identical and their sizes
162 * should be the same (ie both packed)
164 struct btrfs_disk_key {
168 } __attribute__ ((__packed__));
174 } __attribute__ ((__packed__));
176 struct btrfs_mapping_tree {
177 struct cache_tree cache_tree;
180 #define BTRFS_UUID_SIZE 16
181 struct btrfs_dev_item {
182 /* the internal btrfs device id */
185 /* size of the device */
191 /* optimal io alignment for this device */
194 /* optimal io width for this device */
197 /* minimal io size for this device */
200 /* type and info about this device */
203 /* expected generation for this device */
207 * starting byte of this partition on the device,
208 * to allowr for stripe alignment in the future
212 /* grouping information for allocation decisions */
215 /* seek speed 0-100 where 100 is fastest */
218 /* bandwidth 0-100 where 100 is fastest */
221 /* btrfs generated uuid for this device */
222 u8 uuid[BTRFS_UUID_SIZE];
224 /* uuid of FS who owns this device */
225 u8 fsid[BTRFS_UUID_SIZE];
226 } __attribute__ ((__packed__));
228 struct btrfs_stripe {
231 u8 dev_uuid[BTRFS_UUID_SIZE];
232 } __attribute__ ((__packed__));
235 /* size of this chunk in bytes */
238 /* objectid of the root referencing this chunk */
244 /* optimal io alignment for this chunk */
247 /* optimal io width for this chunk */
250 /* minimal io size for this chunk */
253 /* 2^16 stripes is quite a lot, a second limit is the size of a single
258 /* sub stripes only matter for raid10 */
260 struct btrfs_stripe stripe;
261 /* additional stripes go here */
262 } __attribute__ ((__packed__));
264 struct btrfs_free_space_header {
265 struct btrfs_disk_key location;
269 } __attribute__ ((__packed__));
271 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
273 BUG_ON(num_stripes == 0);
274 return sizeof(struct btrfs_chunk) +
275 sizeof(struct btrfs_stripe) * (num_stripes - 1);
278 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
279 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
280 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
281 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
283 #define BTRFS_BACKREF_REV_MAX 256
284 #define BTRFS_BACKREF_REV_SHIFT 56
285 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
286 BTRFS_BACKREF_REV_SHIFT)
288 #define BTRFS_OLD_BACKREF_REV 0
289 #define BTRFS_MIXED_BACKREF_REV 1
292 * every tree block (leaf or node) starts with this header.
294 struct btrfs_header {
295 /* these first four must match the super block */
296 u8 csum[BTRFS_CSUM_SIZE];
297 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
298 __le64 bytenr; /* which block this node is supposed to live in */
301 /* allowed to be different from the super from here on down */
302 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
307 } __attribute__ ((__packed__));
309 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
310 sizeof(struct btrfs_header)) / \
311 sizeof(struct btrfs_key_ptr))
312 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
313 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
314 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
315 sizeof(struct btrfs_item) - \
316 sizeof(struct btrfs_file_extent_item))
317 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
318 sizeof(struct btrfs_item) -\
319 sizeof(struct btrfs_dir_item))
323 * this is a very generous portion of the super block, giving us
324 * room to translate 14 chunks with 3 stripes each.
326 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
327 #define BTRFS_LABEL_SIZE 256
330 * just in case we somehow lose the roots and are not able to mount,
331 * we store an array of the roots from previous transactions
334 #define BTRFS_NUM_BACKUP_ROOTS 4
335 struct btrfs_root_backup {
337 __le64 tree_root_gen;
340 __le64 chunk_root_gen;
343 __le64 extent_root_gen;
352 __le64 csum_root_gen;
362 u8 extent_root_level;
366 /* future and to align */
368 } __attribute__ ((__packed__));
371 * the super block basically lists the main trees of the FS
372 * it currently lacks any block count etc etc
374 struct btrfs_super_block {
375 u8 csum[BTRFS_CSUM_SIZE];
376 /* the first 3 fields must match struct btrfs_header */
377 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
378 __le64 bytenr; /* this block number */
381 /* allowed to be different from the btrfs_header from here own down */
388 /* this will help find the new super based on the log root */
389 __le64 log_root_transid;
392 __le64 root_dir_objectid;
398 __le32 sys_chunk_array_size;
399 __le64 chunk_root_generation;
401 __le64 compat_ro_flags;
402 __le64 incompat_flags;
407 struct btrfs_dev_item dev_item;
409 char label[BTRFS_LABEL_SIZE];
411 __le64 cache_generation;
413 /* future expansion */
415 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
416 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
417 } __attribute__ ((__packed__));
420 * Compat flags that we support. If any incompat flags are set other than the
421 * ones specified below then we will fail to mount
423 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
424 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
425 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
426 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
428 * some patches floated around with a second compression method
429 * lets save that incompat here for when they do get in
430 * Note we don't actually support it, we're just reserving the
433 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
436 * older kernels tried to do bigger metadata blocks, but the
437 * code was pretty buggy. Lets not let them try anymore.
439 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
442 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
443 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
444 #define BTRFS_FEATURE_INCOMPAT_SUPP \
445 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
446 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
447 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
448 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
449 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
452 * A leaf is full of items. offset and size tell us where to find
453 * the item in the leaf (relative to the start of the data area)
456 struct btrfs_disk_key key;
459 } __attribute__ ((__packed__));
462 * leaves have an item area and a data area:
463 * [item0, item1....itemN] [free space] [dataN...data1, data0]
465 * The data is separate from the items to get the keys closer together
469 struct btrfs_header header;
470 struct btrfs_item items[];
471 } __attribute__ ((__packed__));
474 * all non-leaf blocks are nodes, they hold only keys and pointers to
477 struct btrfs_key_ptr {
478 struct btrfs_disk_key key;
481 } __attribute__ ((__packed__));
484 struct btrfs_header header;
485 struct btrfs_key_ptr ptrs[];
486 } __attribute__ ((__packed__));
489 * btrfs_paths remember the path taken from the root down to the leaf.
490 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
491 * to any other levels that are present.
493 * The slots array records the index of the item or block pointer
494 * used while walking the tree.
498 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
499 int slots[BTRFS_MAX_LEVEL];
500 /* if there is real range locking, this locks field will change */
501 int locks[BTRFS_MAX_LEVEL];
503 /* keep some upper locks as we walk down */
507 * set by btrfs_split_item, tells search_slot to keep all locks
508 * and to force calls to keep space in the nodes
510 unsigned int search_for_split:1;
511 unsigned int keep_locks:1;
512 unsigned int skip_locking:1;
513 unsigned int leave_spinning:1;
517 * items in the extent btree are used to record the objectid of the
518 * owner of the block and the number of references
521 struct btrfs_extent_item {
525 } __attribute__ ((__packed__));
527 struct btrfs_extent_item_v0 {
529 } __attribute__ ((__packed__));
531 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
532 sizeof(struct btrfs_item))
534 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
535 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
537 /* following flags only apply to tree blocks */
539 /* use full backrefs for extent pointers in the block*/
540 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
542 struct btrfs_tree_block_info {
543 struct btrfs_disk_key key;
545 } __attribute__ ((__packed__));
547 struct btrfs_extent_data_ref {
552 } __attribute__ ((__packed__));
554 struct btrfs_shared_data_ref {
556 } __attribute__ ((__packed__));
558 struct btrfs_extent_inline_ref {
561 } __attribute__ ((__packed__));
563 struct btrfs_extent_ref_v0 {
568 } __attribute__ ((__packed__));
570 /* dev extents record free space on individual devices. The owner
571 * field points back to the chunk allocation mapping tree that allocated
572 * the extent. The chunk tree uuid field is a way to double check the owner
574 struct btrfs_dev_extent {
576 __le64 chunk_objectid;
579 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
580 } __attribute__ ((__packed__));
582 struct btrfs_inode_ref {
586 } __attribute__ ((__packed__));
588 struct btrfs_timespec {
591 } __attribute__ ((__packed__));
594 BTRFS_COMPRESS_NONE = 0,
595 BTRFS_COMPRESS_ZLIB = 1,
596 BTRFS_COMPRESS_LZO = 2,
597 BTRFS_COMPRESS_TYPES = 2,
598 BTRFS_COMPRESS_LAST = 3,
599 } btrfs_compression_type;
601 /* we don't understand any encryption methods right now */
603 BTRFS_ENCRYPTION_NONE = 0,
604 BTRFS_ENCRYPTION_LAST = 1,
605 } btrfs_encryption_type;
607 struct btrfs_inode_item {
608 /* nfs style generation number */
610 /* transid that last touched this inode */
622 /* modification sequence number for NFS */
626 * a little future expansion, for more than this we can
627 * just grow the inode item and version it
630 struct btrfs_timespec atime;
631 struct btrfs_timespec ctime;
632 struct btrfs_timespec mtime;
633 struct btrfs_timespec otime;
634 } __attribute__ ((__packed__));
636 struct btrfs_dir_log_item {
638 } __attribute__ ((__packed__));
640 struct btrfs_dir_item {
641 struct btrfs_disk_key location;
646 } __attribute__ ((__packed__));
648 struct btrfs_root_item_v0 {
649 struct btrfs_inode_item inode;
655 __le64 last_snapshot;
658 struct btrfs_disk_key drop_progress;
661 } __attribute__ ((__packed__));
663 struct btrfs_root_item {
664 struct btrfs_inode_item inode;
670 __le64 last_snapshot;
673 struct btrfs_disk_key drop_progress;
678 * The following fields appear after subvol_uuids+subvol_times
683 * This generation number is used to test if the new fields are valid
684 * and up to date while reading the root item. Everytime the root item
685 * is written out, the "generation" field is copied into this field. If
686 * anyone ever mounted the fs with an older kernel, we will have
687 * mismatching generation values here and thus must invalidate the
688 * new fields. See btrfs_update_root and btrfs_find_last_root for
690 * the offset of generation_v2 is also used as the start for the memset
691 * when invalidating the fields.
693 __le64 generation_v2;
694 u8 uuid[BTRFS_UUID_SIZE];
695 u8 parent_uuid[BTRFS_UUID_SIZE];
696 u8 received_uuid[BTRFS_UUID_SIZE];
697 __le64 ctransid; /* updated when an inode changes */
698 __le64 otransid; /* trans when created */
699 __le64 stransid; /* trans when sent. non-zero for received subvol */
700 __le64 rtransid; /* trans when received. non-zero for received subvol */
701 struct btrfs_timespec ctime;
702 struct btrfs_timespec otime;
703 struct btrfs_timespec stime;
704 struct btrfs_timespec rtime;
705 __le64 reserved[8]; /* for future */
706 } __attribute__ ((__packed__));
709 * this is used for both forward and backward root refs
711 struct btrfs_root_ref {
715 } __attribute__ ((__packed__));
717 #define BTRFS_FILE_EXTENT_INLINE 0
718 #define BTRFS_FILE_EXTENT_REG 1
719 #define BTRFS_FILE_EXTENT_PREALLOC 2
721 struct btrfs_file_extent_item {
723 * transaction id that created this extent
727 * max number of bytes to hold this extent in ram
728 * when we split a compressed extent we can't know how big
729 * each of the resulting pieces will be. So, this is
730 * an upper limit on the size of the extent in ram instead of
736 * 32 bits for the various ways we might encode the data,
737 * including compression and encryption. If any of these
738 * are set to something a given disk format doesn't understand
739 * it is treated like an incompat flag for reading and writing,
744 __le16 other_encoding; /* spare for later use */
746 /* are we inline data or a real extent? */
750 * disk space consumed by the extent, checksum blocks are included
754 __le64 disk_num_bytes;
756 * the logical offset in file blocks (no csums)
757 * this extent record is for. This allows a file extent to point
758 * into the middle of an existing extent on disk, sharing it
759 * between two snapshots (useful if some bytes in the middle of the
760 * extent have changed
764 * the logical number of file blocks (no csums included)
768 } __attribute__ ((__packed__));
770 struct btrfs_csum_item {
772 } __attribute__ ((__packed__));
774 /* tag for the radix tree of block groups in ram */
775 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
776 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
777 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
778 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
779 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
780 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
781 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
782 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
784 /* used in struct btrfs_balance_args fields */
785 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
787 #define BTRFS_QGROUP_STATUS_OFF 0
788 #define BTRFS_QGROUP_STATUS_ON 1
789 #define BTRFS_QGROUP_STATUS_SCANNING 2
791 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1 << 0)
793 struct btrfs_qgroup_status_item {
797 __le64 scan; /* progress during scanning */
798 } __attribute__ ((__packed__));
800 struct btrfs_block_group_item {
802 __le64 chunk_objectid;
804 } __attribute__ ((__packed__));
806 struct btrfs_qgroup_info_item {
809 __le64 referenced_compressed;
811 __le64 exclusive_compressed;
812 } __attribute__ ((__packed__));
814 /* flags definition for qgroup limits */
815 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
816 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
817 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
818 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
819 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
820 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
822 struct btrfs_qgroup_limit_item {
824 __le64 max_referenced;
825 __le64 max_exclusive;
826 __le64 rsv_referenced;
827 __le64 rsv_exclusive;
828 } __attribute__ ((__packed__));
830 struct btrfs_space_info {
836 struct list_head list;
839 struct btrfs_block_group_cache {
840 struct cache_extent cache;
841 struct btrfs_key key;
842 struct btrfs_block_group_item item;
843 struct btrfs_space_info *space_info;
850 struct btrfs_extent_ops {
851 int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
852 u64 hint_byte, struct btrfs_key *ins);
853 int (*free_extent)(struct btrfs_root *root, u64 bytenr,
858 struct btrfs_fs_devices;
859 struct btrfs_fs_info {
860 u8 fsid[BTRFS_FSID_SIZE];
861 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
862 struct btrfs_root *fs_root;
863 struct btrfs_root *extent_root;
864 struct btrfs_root *tree_root;
865 struct btrfs_root *chunk_root;
866 struct btrfs_root *dev_root;
867 struct btrfs_root *csum_root;
869 struct cache_tree fs_root_cache;
871 /* the log root tree is a directory of all the other log roots */
872 struct btrfs_root *log_root_tree;
874 struct extent_io_tree extent_cache;
875 struct extent_io_tree free_space_cache;
876 struct extent_io_tree block_group_cache;
877 struct extent_io_tree pinned_extents;
878 struct extent_io_tree pending_del;
879 struct extent_io_tree extent_ins;
881 /* logical->physical extent mapping */
882 struct btrfs_mapping_tree mapping_tree;
885 u64 last_trans_committed;
887 u64 avail_data_alloc_bits;
888 u64 avail_metadata_alloc_bits;
889 u64 avail_system_alloc_bits;
890 u64 data_alloc_profile;
891 u64 metadata_alloc_profile;
892 u64 system_alloc_profile;
895 struct btrfs_trans_handle *running_transaction;
896 struct btrfs_super_block super_copy;
897 struct mutex fs_mutex;
902 struct btrfs_extent_ops *extent_ops;
903 struct list_head dirty_cowonly_roots;
905 struct btrfs_fs_devices *fs_devices;
906 struct list_head space_info;
909 int (*free_extent_hook)(struct btrfs_trans_handle *trans,
910 struct btrfs_root *root,
911 u64 bytenr, u64 num_bytes, u64 parent,
912 u64 root_objectid, u64 owner, u64 offset,
914 struct cache_tree *fsck_extent_cache;
915 struct cache_tree *corrupt_blocks;
919 * in ram representation of the tree. extent_root is used for all allocations
920 * and for the extent tree extent_root root.
923 struct extent_buffer *node;
924 struct extent_buffer *commit_root;
925 struct btrfs_root_item root_item;
926 struct btrfs_key root_key;
927 struct btrfs_fs_info *fs_info;
931 /* data allocations are done in sectorsize units */
934 /* node allocations are done in nodesize units */
937 /* leaf allocations are done in leafsize units */
940 /* leaf allocations are done in leafsize units */
949 u64 last_inode_alloc;
951 /* the dirty list is only used by non-reference counted roots */
952 struct list_head dirty_list;
953 struct cache_extent cache;
957 * inode items have the data typically returned from stat and store other
958 * info about object characteristics. There is one for every file and dir in
961 #define BTRFS_INODE_ITEM_KEY 1
962 #define BTRFS_INODE_REF_KEY 12
963 #define BTRFS_XATTR_ITEM_KEY 24
964 #define BTRFS_ORPHAN_ITEM_KEY 48
966 #define BTRFS_DIR_LOG_ITEM_KEY 60
967 #define BTRFS_DIR_LOG_INDEX_KEY 72
969 * dir items are the name -> inode pointers in a directory. There is one
970 * for every name in a directory.
972 #define BTRFS_DIR_ITEM_KEY 84
973 #define BTRFS_DIR_INDEX_KEY 96
976 * extent data is for file data
978 #define BTRFS_EXTENT_DATA_KEY 108
981 * csum items have the checksums for data in the extents
983 #define BTRFS_CSUM_ITEM_KEY 120
985 * extent csums are stored in a separate tree and hold csums for
986 * an entire extent on disk.
988 #define BTRFS_EXTENT_CSUM_KEY 128
991 * root items point to tree roots. There are typically in the root
992 * tree used by the super block to find all the other trees
994 #define BTRFS_ROOT_ITEM_KEY 132
997 * root backrefs tie subvols and snapshots to the directory entries that
1000 #define BTRFS_ROOT_BACKREF_KEY 144
1003 * root refs make a fast index for listing all of the snapshots and
1004 * subvolumes referenced by a given root. They point directly to the
1005 * directory item in the root that references the subvol
1007 #define BTRFS_ROOT_REF_KEY 156
1010 * extent items are in the extent map tree. These record which blocks
1011 * are used, and how many references there are to each block
1013 #define BTRFS_EXTENT_ITEM_KEY 168
1015 #define BTRFS_TREE_BLOCK_REF_KEY 176
1017 #define BTRFS_EXTENT_DATA_REF_KEY 178
1019 /* old style extent backrefs */
1020 #define BTRFS_EXTENT_REF_V0_KEY 180
1022 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1024 #define BTRFS_SHARED_DATA_REF_KEY 184
1028 * block groups give us hints into the extent allocation trees. Which
1029 * blocks are free etc etc
1031 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1033 #define BTRFS_DEV_EXTENT_KEY 204
1034 #define BTRFS_DEV_ITEM_KEY 216
1035 #define BTRFS_CHUNK_ITEM_KEY 228
1037 #define BTRFS_BALANCE_ITEM_KEY 248
1042 #define BTRFS_QGROUP_STATUS_KEY 240
1043 #define BTRFS_QGROUP_INFO_KEY 242
1044 #define BTRFS_QGROUP_LIMIT_KEY 244
1045 #define BTRFS_QGROUP_RELATION_KEY 246
1048 * Persistently stores the io stats in the device tree.
1049 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
1051 #define BTRFS_DEV_STATS_KEY 249
1054 * string items are for debugging. They just store a short string of
1057 #define BTRFS_STRING_ITEM_KEY 253
1061 #define BTRFS_INODE_NODATASUM (1 << 0)
1062 #define BTRFS_INODE_NODATACOW (1 << 1)
1063 #define BTRFS_INODE_READONLY (1 << 2)
1065 #define read_eb_member(eb, ptr, type, member, result) ( \
1066 read_extent_buffer(eb, (char *)(result), \
1067 ((unsigned long)(ptr)) + \
1068 offsetof(type, member), \
1069 sizeof(((type *)0)->member)))
1071 #define write_eb_member(eb, ptr, type, member, result) ( \
1072 write_extent_buffer(eb, (char *)(result), \
1073 ((unsigned long)(ptr)) + \
1074 offsetof(type, member), \
1075 sizeof(((type *)0)->member)))
1077 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1078 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1080 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1081 return le##bits##_to_cpu(h->member); \
1083 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1086 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1087 h->member = cpu_to_le##bits(val); \
1090 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1091 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
1094 unsigned long offset = (unsigned long)s; \
1095 type *p = (type *) (eb->data + offset); \
1096 return get_unaligned_le##bits(&p->member); \
1098 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1099 type *s, u##bits val) \
1101 unsigned long offset = (unsigned long)s; \
1102 type *p = (type *) (eb->data + offset); \
1103 put_unaligned_le##bits(val, &p->member); \
1106 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1107 static inline u##bits btrfs_##name(type *s) \
1109 return le##bits##_to_cpu(s->member); \
1111 static inline void btrfs_set_##name(type *s, u##bits val) \
1113 s->member = cpu_to_le##bits(val); \
1116 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1117 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1118 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1119 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1120 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1121 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1123 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1124 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1125 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1126 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1127 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1128 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1130 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1131 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1133 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1135 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1137 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1139 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1141 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1142 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1144 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1146 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1148 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1151 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1153 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1156 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1158 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1161 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1162 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1163 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1164 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1165 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1166 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1167 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1168 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1169 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1170 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1171 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1173 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1175 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1178 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1179 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1180 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1182 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1184 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1186 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1188 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1189 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1191 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1193 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1194 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1196 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1199 unsigned long offset = (unsigned long)c;
1200 offset += offsetof(struct btrfs_chunk, stripe);
1201 offset += nr * sizeof(struct btrfs_stripe);
1202 return (struct btrfs_stripe *)offset;
1205 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1207 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1210 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1211 struct btrfs_chunk *c, int nr)
1213 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1216 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1217 struct btrfs_chunk *c, int nr,
1220 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1223 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1224 struct btrfs_chunk *c, int nr)
1226 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1229 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1230 struct btrfs_chunk *c, int nr,
1233 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1236 /* struct btrfs_block_group_item */
1237 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1239 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1241 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1242 struct btrfs_block_group_item, chunk_objectid, 64);
1244 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1245 struct btrfs_block_group_item, chunk_objectid, 64);
1246 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1247 struct btrfs_block_group_item, flags, 64);
1248 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1249 struct btrfs_block_group_item, flags, 64);
1251 /* struct btrfs_inode_ref */
1252 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1253 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1254 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1256 /* struct btrfs_inode_item */
1257 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1258 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1259 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1260 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1261 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1262 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1263 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1264 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1265 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1266 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1267 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1268 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1270 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1271 struct btrfs_inode_item, generation, 64);
1272 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1273 struct btrfs_inode_item, generation, 64);
1274 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1275 struct btrfs_inode_item, size, 64);
1276 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1277 struct btrfs_inode_item, nbytes, 64);
1278 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1279 struct btrfs_inode_item, block_group, 64);
1280 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1281 struct btrfs_inode_item, nlink, 32);
1282 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1283 struct btrfs_inode_item, uid, 32);
1284 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1285 struct btrfs_inode_item, gid, 32);
1286 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1287 struct btrfs_inode_item, mode, 32);
1288 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1289 struct btrfs_inode_item, rdev, 64);
1290 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1291 struct btrfs_inode_item, flags, 64);
1293 static inline struct btrfs_timespec *
1294 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1296 unsigned long ptr = (unsigned long)inode_item;
1297 ptr += offsetof(struct btrfs_inode_item, atime);
1298 return (struct btrfs_timespec *)ptr;
1301 static inline struct btrfs_timespec *
1302 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1304 unsigned long ptr = (unsigned long)inode_item;
1305 ptr += offsetof(struct btrfs_inode_item, mtime);
1306 return (struct btrfs_timespec *)ptr;
1309 static inline struct btrfs_timespec *
1310 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1312 unsigned long ptr = (unsigned long)inode_item;
1313 ptr += offsetof(struct btrfs_inode_item, ctime);
1314 return (struct btrfs_timespec *)ptr;
1317 static inline struct btrfs_timespec *
1318 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1320 unsigned long ptr = (unsigned long)inode_item;
1321 ptr += offsetof(struct btrfs_inode_item, otime);
1322 return (struct btrfs_timespec *)ptr;
1325 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1326 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1327 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1329 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1332 /* struct btrfs_dev_extent */
1333 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1335 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1336 chunk_objectid, 64);
1337 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1339 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1341 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1343 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1344 return (u8 *)((unsigned long)dev + ptr);
1348 /* struct btrfs_extent_item */
1349 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1350 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1352 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1354 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1356 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1358 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1359 struct btrfs_tree_block_info *item,
1360 struct btrfs_disk_key *key)
1362 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1365 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1366 struct btrfs_tree_block_info *item,
1367 struct btrfs_disk_key *key)
1369 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1372 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1374 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1376 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1378 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1381 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1384 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1386 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1389 static inline u32 btrfs_extent_inline_ref_size(int type)
1391 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1392 type == BTRFS_SHARED_BLOCK_REF_KEY)
1393 return sizeof(struct btrfs_extent_inline_ref);
1394 if (type == BTRFS_SHARED_DATA_REF_KEY)
1395 return sizeof(struct btrfs_shared_data_ref) +
1396 sizeof(struct btrfs_extent_inline_ref);
1397 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1398 return sizeof(struct btrfs_extent_data_ref) +
1399 offsetof(struct btrfs_extent_inline_ref, offset);
1404 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1405 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1407 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1408 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1410 /* struct btrfs_node */
1411 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1412 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1414 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1417 ptr = offsetof(struct btrfs_node, ptrs) +
1418 sizeof(struct btrfs_key_ptr) * nr;
1419 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1422 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1426 ptr = offsetof(struct btrfs_node, ptrs) +
1427 sizeof(struct btrfs_key_ptr) * nr;
1428 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1431 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1434 ptr = offsetof(struct btrfs_node, ptrs) +
1435 sizeof(struct btrfs_key_ptr) * nr;
1436 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1439 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1443 ptr = offsetof(struct btrfs_node, ptrs) +
1444 sizeof(struct btrfs_key_ptr) * nr;
1445 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1448 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1450 return offsetof(struct btrfs_node, ptrs) +
1451 sizeof(struct btrfs_key_ptr) * nr;
1454 static inline void btrfs_node_key(struct extent_buffer *eb,
1455 struct btrfs_disk_key *disk_key, int nr)
1458 ptr = btrfs_node_key_ptr_offset(nr);
1459 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1460 struct btrfs_key_ptr, key, disk_key);
1463 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1464 struct btrfs_disk_key *disk_key, int nr)
1467 ptr = btrfs_node_key_ptr_offset(nr);
1468 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1469 struct btrfs_key_ptr, key, disk_key);
1472 /* struct btrfs_item */
1473 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1474 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1476 static inline unsigned long btrfs_item_nr_offset(int nr)
1478 return offsetof(struct btrfs_leaf, items) +
1479 sizeof(struct btrfs_item) * nr;
1482 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1485 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1488 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1489 struct btrfs_item *item)
1491 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1494 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1496 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1499 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1501 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1504 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1506 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1509 static inline void btrfs_item_key(struct extent_buffer *eb,
1510 struct btrfs_disk_key *disk_key, int nr)
1512 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1513 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1516 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1517 struct btrfs_disk_key *disk_key, int nr)
1519 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1520 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1523 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1526 * struct btrfs_root_ref
1528 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1529 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1530 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1532 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1533 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1534 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1536 /* struct btrfs_dir_item */
1537 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1538 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1539 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1540 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1542 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1544 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1545 struct btrfs_dir_item *item,
1546 struct btrfs_disk_key *key)
1548 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1551 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1552 struct btrfs_dir_item *item,
1553 struct btrfs_disk_key *key)
1555 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1558 /* struct btrfs_free_space_header */
1559 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1561 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1563 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1566 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1567 struct btrfs_free_space_header *h,
1568 struct btrfs_disk_key *key)
1570 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1573 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1574 struct btrfs_free_space_header *h,
1575 struct btrfs_disk_key *key)
1577 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1580 /* struct btrfs_disk_key */
1581 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1583 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1584 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1586 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1587 struct btrfs_disk_key *disk)
1589 cpu->offset = le64_to_cpu(disk->offset);
1590 cpu->type = disk->type;
1591 cpu->objectid = le64_to_cpu(disk->objectid);
1594 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1595 struct btrfs_key *cpu)
1597 disk->offset = cpu_to_le64(cpu->offset);
1598 disk->type = cpu->type;
1599 disk->objectid = cpu_to_le64(cpu->objectid);
1602 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1603 struct btrfs_key *key, int nr)
1605 struct btrfs_disk_key disk_key;
1606 btrfs_node_key(eb, &disk_key, nr);
1607 btrfs_disk_key_to_cpu(key, &disk_key);
1610 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1611 struct btrfs_key *key, int nr)
1613 struct btrfs_disk_key disk_key;
1614 btrfs_item_key(eb, &disk_key, nr);
1615 btrfs_disk_key_to_cpu(key, &disk_key);
1618 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1619 struct btrfs_dir_item *item,
1620 struct btrfs_key *key)
1622 struct btrfs_disk_key disk_key;
1623 btrfs_dir_item_key(eb, item, &disk_key);
1624 btrfs_disk_key_to_cpu(key, &disk_key);
1628 static inline u8 btrfs_key_type(struct btrfs_key *key)
1633 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1638 /* struct btrfs_header */
1639 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1640 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1642 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1643 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1644 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1645 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1647 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1649 return (btrfs_header_flags(eb) & flag) == flag;
1652 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1654 u64 flags = btrfs_header_flags(eb);
1655 btrfs_set_header_flags(eb, flags | flag);
1656 return (flags & flag) == flag;
1659 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1661 u64 flags = btrfs_header_flags(eb);
1662 btrfs_set_header_flags(eb, flags & ~flag);
1663 return (flags & flag) == flag;
1666 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1668 u64 flags = btrfs_header_flags(eb);
1669 return flags >> BTRFS_BACKREF_REV_SHIFT;
1672 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1675 u64 flags = btrfs_header_flags(eb);
1676 flags &= ~BTRFS_BACKREF_REV_MASK;
1677 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1678 btrfs_set_header_flags(eb, flags);
1681 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1683 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1687 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1689 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1693 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1695 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1699 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1701 unsigned long ptr = offsetof(struct btrfs_header, csum);
1705 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1710 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1715 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1720 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1722 return (btrfs_header_level(eb) == 0);
1725 /* struct btrfs_root_item */
1726 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1728 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1729 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1730 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1732 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1734 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1735 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1736 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1737 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1738 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1739 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1740 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1741 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1743 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
1745 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
1747 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
1749 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
1751 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
1754 /* struct btrfs_root_backup */
1755 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
1757 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
1759 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
1760 tree_root_level, 8);
1762 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
1764 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
1765 chunk_root_gen, 64);
1766 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
1767 chunk_root_level, 8);
1769 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
1771 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
1772 extent_root_gen, 64);
1773 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
1774 extent_root_level, 8);
1776 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
1778 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
1780 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
1783 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
1785 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
1787 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
1790 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
1792 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
1794 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
1795 csum_root_level, 8);
1796 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
1798 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
1800 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
1803 /* struct btrfs_super_block */
1805 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1806 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1807 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1809 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1810 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1811 struct btrfs_super_block, sys_chunk_array_size, 32);
1812 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1813 struct btrfs_super_block, chunk_root_generation, 64);
1814 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1816 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1818 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1819 chunk_root_level, 8);
1820 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1822 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1823 log_root_transid, 64);
1824 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1826 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1828 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1830 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1832 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1834 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1836 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1838 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1839 root_dir_objectid, 64);
1840 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1842 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1844 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1846 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1847 incompat_flags, 64);
1848 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1850 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
1851 cache_generation, 64);
1853 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1855 int t = btrfs_super_csum_type(s);
1856 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1857 return btrfs_csum_sizes[t];
1860 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1862 return offsetof(struct btrfs_leaf, items);
1865 /* struct btrfs_file_extent_item */
1866 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1867 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
1869 static inline unsigned long btrfs_file_extent_inline_start(struct
1870 btrfs_file_extent_item *e)
1872 unsigned long offset = (unsigned long)e;
1873 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1877 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1879 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1882 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1884 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
1886 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1888 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
1890 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1891 disk_num_bytes, 64);
1892 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1894 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
1896 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1898 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
1900 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1902 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
1904 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1906 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
1908 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1910 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1911 other_encoding, 16);
1913 /* btrfs_qgroup_status_item */
1914 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
1916 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
1918 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
1920 BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
1923 /* btrfs_qgroup_info_item */
1924 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
1926 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
1928 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
1929 struct btrfs_qgroup_info_item, referenced_compressed, 64);
1930 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
1932 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
1933 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
1935 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
1936 struct btrfs_qgroup_info_item, generation, 64);
1937 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
1938 struct btrfs_qgroup_info_item, referenced, 64);
1939 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
1940 struct btrfs_qgroup_info_item, referenced_compressed, 64);
1941 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
1942 struct btrfs_qgroup_info_item, exclusive, 64);
1943 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
1944 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
1946 /* btrfs_qgroup_limit_item */
1947 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
1949 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
1950 max_referenced, 64);
1951 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
1953 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
1954 rsv_referenced, 64);
1955 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
1958 /* this returns the number of file bytes represented by the inline item.
1959 * If an item is compressed, this is the uncompressed size
1961 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1962 struct btrfs_file_extent_item *e)
1964 return btrfs_file_extent_ram_bytes(eb, e);
1968 * this returns the number of bytes used by the item on disk, minus the
1969 * size of any extent headers. If a file is compressed on disk, this is
1970 * the compressed size
1972 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1973 struct btrfs_item *e)
1975 unsigned long offset;
1976 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1977 return btrfs_item_size(eb, e) - offset;
1980 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1982 return root->leafsize;
1983 return root->nodesize;
1986 /* helper function to cast into the data area of the leaf. */
1987 #define btrfs_item_ptr(leaf, slot, type) \
1988 ((type *)(btrfs_leaf_data(leaf) + \
1989 btrfs_item_offset_nr(leaf, slot)))
1991 #define btrfs_item_ptr_offset(leaf, slot) \
1992 ((unsigned long)(btrfs_leaf_data(leaf) + \
1993 btrfs_item_offset_nr(leaf, slot)))
1996 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
1997 struct btrfs_root *root);
1998 int btrfs_check_block_accounting(struct btrfs_root *root);
1999 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
2000 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
2001 struct btrfs_root *root);
2002 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
2003 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
2004 btrfs_fs_info *info,
2006 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
2007 struct btrfs_block_group_cache
2008 *hint, u64 search_start,
2009 int data, int owner);
2010 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2011 struct btrfs_root *root,
2012 u32 blocksize, u64 root_objectid,
2013 struct btrfs_disk_key *key, int level,
2014 u64 hint, u64 empty_size);
2015 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
2016 struct btrfs_root *root,
2017 u64 num_bytes, u64 parent,
2018 u64 root_objectid, u64 ref_generation,
2019 u64 owner, u64 empty_size, u64 hint_byte,
2020 u64 search_end, struct btrfs_key *ins, int data);
2021 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2022 struct btrfs_root *root, u64 bytenr,
2023 u64 num_bytes, u64 *refs, u64 *flags);
2024 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
2025 struct btrfs_root *root,
2026 u64 bytenr, u64 num_bytes, u64 flags);
2027 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2028 struct extent_buffer *buf, int record_parent);
2029 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2030 struct extent_buffer *buf, int record_parent);
2031 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2032 struct btrfs_root *root,
2033 u64 bytenr, u64 num_bytes, u64 parent,
2034 u64 root_objectid, u64 owner, u64 offset);
2035 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2036 struct btrfs_root *root,
2037 struct extent_io_tree *unpin);
2038 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2039 struct btrfs_root *root,
2040 u64 bytenr, u64 num_bytes, u64 parent,
2041 u64 root_objectid, u64 ref_generation,
2042 u64 owner_objectid);
2043 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2044 struct btrfs_root *root, u64 bytenr,
2045 u64 orig_parent, u64 parent,
2046 u64 root_objectid, u64 ref_generation,
2047 u64 owner_objectid);
2048 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2049 struct btrfs_root *root);
2050 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2051 int btrfs_read_block_groups(struct btrfs_root *root);
2052 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2053 struct btrfs_root *root, u64 bytes_used,
2054 u64 type, u64 chunk_objectid, u64 chunk_offset,
2056 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
2057 struct btrfs_root *root);
2058 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
2059 struct btrfs_root *root, u64 bytenr, u64 num,
2060 int alloc, int mark_free);
2062 int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2063 struct btrfs_path *path, int level, int slot);
2064 int btrfs_check_node(struct btrfs_root *root,
2065 struct btrfs_disk_key *parent_key,
2066 struct extent_buffer *buf);
2067 int btrfs_check_leaf(struct btrfs_root *root,
2068 struct btrfs_disk_key *parent_key,
2069 struct extent_buffer *buf);
2070 int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
2071 struct btrfs_root *root);
2072 void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
2073 int level, int slot, u64 objectid);
2074 struct extent_buffer *read_node_slot(struct btrfs_root *root,
2075 struct extent_buffer *parent, int slot);
2076 int btrfs_previous_item(struct btrfs_root *root,
2077 struct btrfs_path *path, u64 min_objectid,
2079 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
2080 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2081 struct btrfs_root *root, struct extent_buffer *buf,
2082 struct extent_buffer *parent, int parent_slot,
2083 struct extent_buffer **cow_ret);
2084 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
2085 struct btrfs_root *root,
2086 struct extent_buffer *buf,
2087 struct extent_buffer *parent, int parent_slot,
2088 struct extent_buffer **cow_ret,
2089 u64 search_start, u64 empty_size);
2090 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2091 struct btrfs_root *root,
2092 struct extent_buffer *buf,
2093 struct extent_buffer **cow_ret, u64 new_root_objectid);
2094 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2095 *root, struct btrfs_path *path, u32 data_size);
2096 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2097 struct btrfs_root *root,
2098 struct btrfs_path *path,
2099 u32 new_size, int from_end);
2100 int btrfs_split_item(struct btrfs_trans_handle *trans,
2101 struct btrfs_root *root,
2102 struct btrfs_path *path,
2103 struct btrfs_key *new_key,
2104 unsigned long split_offset);
2105 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2106 *root, struct btrfs_key *key, struct btrfs_path *p, int
2108 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2109 struct btrfs_root *root, struct extent_buffer *parent,
2110 int start_slot, int cache_only, u64 *last_ret,
2111 struct btrfs_key *progress);
2112 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2113 struct btrfs_path *btrfs_alloc_path(void);
2114 void btrfs_free_path(struct btrfs_path *p);
2115 void btrfs_init_path(struct btrfs_path *p);
2116 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2117 struct btrfs_path *path, int slot, int nr);
2119 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2120 struct btrfs_root *root,
2121 struct btrfs_path *path)
2123 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2126 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2127 *root, struct btrfs_key *key, void *data, u32 data_size);
2128 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2129 struct btrfs_root *root,
2130 struct btrfs_path *path,
2131 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2133 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2134 struct btrfs_root *root,
2135 struct btrfs_path *path,
2136 struct btrfs_key *key,
2139 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2142 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2143 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2144 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2145 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
2147 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2148 struct btrfs_root *root, struct btrfs_path *path,
2149 struct btrfs_key *new_key);
2152 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2153 struct btrfs_root *tree_root,
2154 u64 root_id, u8 type, u64 ref_id,
2155 u64 dirid, u64 sequence,
2156 const char *name, int name_len);
2157 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2158 struct btrfs_key *key);
2159 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2160 *root, struct btrfs_key *key, struct btrfs_root_item
2162 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2163 *root, struct btrfs_key *key, struct btrfs_root_item
2165 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2166 btrfs_root_item *item, struct btrfs_key *key);
2167 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
2168 struct btrfs_root *latest_root);
2170 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
2171 *root, const char *name, int name_len, u64 dir,
2172 struct btrfs_key *location, u8 type, u64 index);
2173 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2174 struct btrfs_root *root,
2175 struct btrfs_path *path, u64 dir,
2176 const char *name, int name_len,
2178 struct btrfs_dir_item *
2179 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2180 struct btrfs_root *root,
2181 struct btrfs_path *path, u64 dir,
2182 u64 objectid, const char *name, int name_len,
2184 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2185 struct btrfs_path *path,
2186 const char *name, int name_len);
2187 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2188 struct btrfs_root *root,
2189 struct btrfs_path *path,
2190 struct btrfs_dir_item *di);
2191 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2192 struct btrfs_root *root, const char *name,
2193 u16 name_len, const void *data, u16 data_len,
2195 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2196 struct btrfs_root *root,
2197 struct btrfs_path *path, u64 dir,
2198 const char *name, u16 name_len,
2201 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2202 struct btrfs_root *fs_root,
2203 u64 dirid, u64 *objectid);
2204 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2207 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2208 struct btrfs_root *root,
2209 const char *name, int name_len,
2210 u64 inode_objectid, u64 ref_objectid, u64 index);
2211 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2212 struct btrfs_root *root,
2213 const char *name, int name_len,
2214 u64 inode_objectid, u64 ref_objectid);
2215 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2216 struct btrfs_root *root,
2217 struct btrfs_path *path, u64 objectid);
2218 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2219 *root, u64 objectid, struct btrfs_inode_item
2221 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2222 *root, struct btrfs_path *path,
2223 struct btrfs_key *location, int mod);
2226 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2227 struct btrfs_root *root, u64 bytenr, u64 len);
2228 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2229 struct btrfs_root *root,
2230 u64 objectid, u64 pos, u64 offset,
2233 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
2234 struct btrfs_root *root, u64 objectid,
2235 u64 offset, char *buffer, size_t size);
2236 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2237 struct btrfs_root *root,
2238 struct btrfs_path *path, u64 objectid,
2239 u64 bytenr, int mod);
2240 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
2241 struct btrfs_root *root, u64 alloc_end,
2242 u64 bytenr, char *data, size_t len);
2243 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2244 struct btrfs_root *root,
2245 struct btrfs_path *path,
2246 u64 bytenr, int cow);
2247 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2248 struct btrfs_root *root, struct btrfs_path *path,