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.
22 #if BTRFS_FLAT_INCLUDES
24 #include "kerncompat.h"
25 #include "radix-tree.h"
26 #include "extent-cache.h"
27 #include "extent_io.h"
30 #include <btrfs/list.h>
31 #include <btrfs/kerncompat.h>
32 #include <btrfs/radix-tree.h>
33 #include <btrfs/extent-cache.h>
34 #include <btrfs/extent_io.h>
35 #include <btrfs/ioctl.h>
36 #endif /* BTRFS_FLAT_INCLUDES */
39 struct btrfs_trans_handle;
40 struct btrfs_free_space_ctl;
41 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
43 #define BTRFS_MAX_MIRRORS 3
45 #define BTRFS_MAX_LEVEL 8
47 #define BTRFS_COMPAT_EXTENT_TREE_V0
49 /* holds pointers to all of the tree roots */
50 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
52 /* stores information about which extents are in use, and reference counts */
53 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
56 * chunk tree stores translations from logical -> physical block numbering
57 * the super block points to the chunk tree
59 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
62 * stores information about which areas of a given device are in use.
63 * one per device. The tree of tree roots points to the device tree
65 #define BTRFS_DEV_TREE_OBJECTID 4ULL
67 /* one per subvolume, storing files and directories */
68 #define BTRFS_FS_TREE_OBJECTID 5ULL
70 /* directory objectid inside the root tree */
71 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
72 /* holds checksums of all the data extents */
73 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
74 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
76 /* for storing items that use the BTRFS_UUID_KEY* */
77 #define BTRFS_UUID_TREE_OBJECTID 9ULL
79 /* for storing balance parameters in the root tree */
80 #define BTRFS_BALANCE_OBJECTID -4ULL
82 /* oprhan objectid for tracking unlinked/truncated files */
83 #define BTRFS_ORPHAN_OBJECTID -5ULL
85 /* does write ahead logging to speed up fsyncs */
86 #define BTRFS_TREE_LOG_OBJECTID -6ULL
87 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
90 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
91 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
94 * extent checksums all have this objectid
95 * this allows them to share the logging tree
98 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
100 /* For storing free space cache */
101 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
104 * The inode number assigned to the special inode for sotring
107 #define BTRFS_FREE_INO_OBJECTID -12ULL
109 /* dummy objectid represents multiple objectids */
110 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
113 * All files have objectids in this range.
115 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
116 #define BTRFS_LAST_FREE_OBJECTID -256ULL
117 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
122 * the device items go into the chunk tree. The key is in the form
123 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
125 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
128 * the max metadata block size. This limit is somewhat artificial,
129 * but the memmove costs go through the roof for larger blocks.
131 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
134 * we can actually store much bigger names, but lets not confuse the rest
137 #define BTRFS_NAME_LEN 255
140 * Theoretical limit is larger, but we keep this down to a sane
141 * value. That should limit greatly the possibility of collisions on
144 #define BTRFS_LINK_MAX 65535U
146 /* 32 bytes in various csum fields */
147 #define BTRFS_CSUM_SIZE 32
150 #define BTRFS_CSUM_TYPE_CRC32 0
152 static int btrfs_csum_sizes[] = { 4, 0 };
154 /* four bytes for CRC32 */
155 #define BTRFS_CRC32_SIZE 4
156 #define BTRFS_EMPTY_DIR_SIZE 0
158 #define BTRFS_FT_UNKNOWN 0
159 #define BTRFS_FT_REG_FILE 1
160 #define BTRFS_FT_DIR 2
161 #define BTRFS_FT_CHRDEV 3
162 #define BTRFS_FT_BLKDEV 4
163 #define BTRFS_FT_FIFO 5
164 #define BTRFS_FT_SOCK 6
165 #define BTRFS_FT_SYMLINK 7
166 #define BTRFS_FT_XATTR 8
167 #define BTRFS_FT_MAX 9
169 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
172 * the key defines the order in the tree, and so it also defines (optimal)
173 * block layout. objectid corresonds to the inode number. The flags
174 * tells us things about the object, and is a kind of stream selector.
175 * so for a given inode, keys with flags of 1 might refer to the inode
176 * data, flags of 2 may point to file data in the btree and flags == 3
177 * may point to extents.
179 * offset is the starting byte offset for this key in the stream.
181 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
182 * in cpu native order. Otherwise they are identical and their sizes
183 * should be the same (ie both packed)
185 struct btrfs_disk_key {
189 } __attribute__ ((__packed__));
195 } __attribute__ ((__packed__));
197 struct btrfs_mapping_tree {
198 struct cache_tree cache_tree;
201 #define BTRFS_UUID_SIZE 16
202 struct btrfs_dev_item {
203 /* the internal btrfs device id */
206 /* size of the device */
212 /* optimal io alignment for this device */
215 /* optimal io width for this device */
218 /* minimal io size for this device */
221 /* type and info about this device */
224 /* expected generation for this device */
228 * starting byte of this partition on the device,
229 * to allowr for stripe alignment in the future
233 /* grouping information for allocation decisions */
236 /* seek speed 0-100 where 100 is fastest */
239 /* bandwidth 0-100 where 100 is fastest */
242 /* btrfs generated uuid for this device */
243 u8 uuid[BTRFS_UUID_SIZE];
245 /* uuid of FS who owns this device */
246 u8 fsid[BTRFS_UUID_SIZE];
247 } __attribute__ ((__packed__));
249 struct btrfs_stripe {
252 u8 dev_uuid[BTRFS_UUID_SIZE];
253 } __attribute__ ((__packed__));
256 /* size of this chunk in bytes */
259 /* objectid of the root referencing this chunk */
265 /* optimal io alignment for this chunk */
268 /* optimal io width for this chunk */
271 /* minimal io size for this chunk */
274 /* 2^16 stripes is quite a lot, a second limit is the size of a single
279 /* sub stripes only matter for raid10 */
281 struct btrfs_stripe stripe;
282 /* additional stripes go here */
283 } __attribute__ ((__packed__));
285 #define BTRFS_FREE_SPACE_EXTENT 1
286 #define BTRFS_FREE_SPACE_BITMAP 2
288 struct btrfs_free_space_entry {
292 } __attribute__ ((__packed__));
294 struct btrfs_free_space_header {
295 struct btrfs_disk_key location;
299 } __attribute__ ((__packed__));
301 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
303 BUG_ON(num_stripes == 0);
304 return sizeof(struct btrfs_chunk) +
305 sizeof(struct btrfs_stripe) * (num_stripes - 1);
308 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
309 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
310 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
311 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
313 #define BTRFS_BACKREF_REV_MAX 256
314 #define BTRFS_BACKREF_REV_SHIFT 56
315 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
316 BTRFS_BACKREF_REV_SHIFT)
318 #define BTRFS_OLD_BACKREF_REV 0
319 #define BTRFS_MIXED_BACKREF_REV 1
322 * every tree block (leaf or node) starts with this header.
324 struct btrfs_header {
325 /* these first four must match the super block */
326 u8 csum[BTRFS_CSUM_SIZE];
327 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
328 __le64 bytenr; /* which block this node is supposed to live in */
331 /* allowed to be different from the super from here on down */
332 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
337 } __attribute__ ((__packed__));
339 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
340 sizeof(struct btrfs_header)) / \
341 sizeof(struct btrfs_key_ptr))
342 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
343 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
344 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
345 sizeof(struct btrfs_item) - \
346 sizeof(struct btrfs_file_extent_item))
347 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
348 sizeof(struct btrfs_item) -\
349 sizeof(struct btrfs_dir_item))
353 * this is a very generous portion of the super block, giving us
354 * room to translate 14 chunks with 3 stripes each.
356 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
357 #define BTRFS_LABEL_SIZE 256
360 * just in case we somehow lose the roots and are not able to mount,
361 * we store an array of the roots from previous transactions
364 #define BTRFS_NUM_BACKUP_ROOTS 4
365 struct btrfs_root_backup {
367 __le64 tree_root_gen;
370 __le64 chunk_root_gen;
373 __le64 extent_root_gen;
382 __le64 csum_root_gen;
392 u8 extent_root_level;
396 /* future and to align */
398 } __attribute__ ((__packed__));
401 * the super block basically lists the main trees of the FS
402 * it currently lacks any block count etc etc
404 struct btrfs_super_block {
405 u8 csum[BTRFS_CSUM_SIZE];
406 /* the first 3 fields must match struct btrfs_header */
407 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
408 __le64 bytenr; /* this block number */
411 /* allowed to be different from the btrfs_header from here own down */
418 /* this will help find the new super based on the log root */
419 __le64 log_root_transid;
422 __le64 root_dir_objectid;
428 __le32 sys_chunk_array_size;
429 __le64 chunk_root_generation;
431 __le64 compat_ro_flags;
432 __le64 incompat_flags;
437 struct btrfs_dev_item dev_item;
439 char label[BTRFS_LABEL_SIZE];
441 __le64 cache_generation;
442 __le64 uuid_tree_generation;
444 /* future expansion */
446 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
447 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
448 } __attribute__ ((__packed__));
451 * Compat flags that we support. If any incompat flags are set other than the
452 * ones specified below then we will fail to mount
454 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
455 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
456 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
457 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
460 * some patches floated around with a second compression method
461 * lets save that incompat here for when they do get in
462 * Note we don't actually support it, we're just reserving the
465 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
468 * older kernels tried to do bigger metadata blocks, but the
469 * code was pretty buggy. Lets not let them try anymore.
471 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
472 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
473 #define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
474 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
475 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
478 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
479 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
480 #define BTRFS_FEATURE_INCOMPAT_SUPP \
481 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
482 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
483 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
484 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
485 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
486 BTRFS_FEATURE_INCOMPAT_RAID56 | \
487 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
488 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
489 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
492 * A leaf is full of items. offset and size tell us where to find
493 * the item in the leaf (relative to the start of the data area)
496 struct btrfs_disk_key key;
499 } __attribute__ ((__packed__));
502 * leaves have an item area and a data area:
503 * [item0, item1....itemN] [free space] [dataN...data1, data0]
505 * The data is separate from the items to get the keys closer together
509 struct btrfs_header header;
510 struct btrfs_item items[];
511 } __attribute__ ((__packed__));
514 * all non-leaf blocks are nodes, they hold only keys and pointers to
517 struct btrfs_key_ptr {
518 struct btrfs_disk_key key;
521 } __attribute__ ((__packed__));
524 struct btrfs_header header;
525 struct btrfs_key_ptr ptrs[];
526 } __attribute__ ((__packed__));
529 * btrfs_paths remember the path taken from the root down to the leaf.
530 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
531 * to any other levels that are present.
533 * The slots array records the index of the item or block pointer
534 * used while walking the tree.
538 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
539 int slots[BTRFS_MAX_LEVEL];
540 /* if there is real range locking, this locks field will change */
541 int locks[BTRFS_MAX_LEVEL];
543 /* keep some upper locks as we walk down */
547 * set by btrfs_split_item, tells search_slot to keep all locks
548 * and to force calls to keep space in the nodes
550 unsigned int search_for_split:1;
551 unsigned int skip_check_block:1;
555 * items in the extent btree are used to record the objectid of the
556 * owner of the block and the number of references
559 struct btrfs_extent_item {
563 } __attribute__ ((__packed__));
565 struct btrfs_extent_item_v0 {
567 } __attribute__ ((__packed__));
569 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
570 sizeof(struct btrfs_item))
572 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
573 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
575 /* following flags only apply to tree blocks */
577 /* use full backrefs for extent pointers in the block*/
578 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
580 struct btrfs_tree_block_info {
581 struct btrfs_disk_key key;
583 } __attribute__ ((__packed__));
585 struct btrfs_extent_data_ref {
590 } __attribute__ ((__packed__));
592 struct btrfs_shared_data_ref {
594 } __attribute__ ((__packed__));
596 struct btrfs_extent_inline_ref {
599 } __attribute__ ((__packed__));
601 struct btrfs_extent_ref_v0 {
606 } __attribute__ ((__packed__));
608 /* dev extents record free space on individual devices. The owner
609 * field points back to the chunk allocation mapping tree that allocated
610 * the extent. The chunk tree uuid field is a way to double check the owner
612 struct btrfs_dev_extent {
614 __le64 chunk_objectid;
617 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
618 } __attribute__ ((__packed__));
620 struct btrfs_inode_ref {
624 } __attribute__ ((__packed__));
626 struct btrfs_inode_extref {
627 __le64 parent_objectid;
630 __u8 name[0]; /* name goes here */
631 } __attribute__ ((__packed__));
633 struct btrfs_timespec {
636 } __attribute__ ((__packed__));
639 BTRFS_COMPRESS_NONE = 0,
640 BTRFS_COMPRESS_ZLIB = 1,
641 BTRFS_COMPRESS_LZO = 2,
642 BTRFS_COMPRESS_TYPES = 2,
643 BTRFS_COMPRESS_LAST = 3,
644 } btrfs_compression_type;
646 /* we don't understand any encryption methods right now */
648 BTRFS_ENCRYPTION_NONE = 0,
649 BTRFS_ENCRYPTION_LAST = 1,
650 } btrfs_encryption_type;
652 enum btrfs_tree_block_status {
653 BTRFS_TREE_BLOCK_CLEAN,
654 BTRFS_TREE_BLOCK_INVALID_NRITEMS,
655 BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
656 BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
657 BTRFS_TREE_BLOCK_INVALID_LEVEL,
658 BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
659 BTRFS_TREE_BLOCK_INVALID_OFFSETS,
662 struct btrfs_inode_item {
663 /* nfs style generation number */
665 /* transid that last touched this inode */
677 /* modification sequence number for NFS */
681 * a little future expansion, for more than this we can
682 * just grow the inode item and version it
685 struct btrfs_timespec atime;
686 struct btrfs_timespec ctime;
687 struct btrfs_timespec mtime;
688 struct btrfs_timespec otime;
689 } __attribute__ ((__packed__));
691 struct btrfs_dir_log_item {
693 } __attribute__ ((__packed__));
695 struct btrfs_dir_item {
696 struct btrfs_disk_key location;
701 } __attribute__ ((__packed__));
703 struct btrfs_root_item_v0 {
704 struct btrfs_inode_item inode;
710 __le64 last_snapshot;
713 struct btrfs_disk_key drop_progress;
716 } __attribute__ ((__packed__));
718 struct btrfs_root_item {
719 struct btrfs_inode_item inode;
725 __le64 last_snapshot;
728 struct btrfs_disk_key drop_progress;
733 * The following fields appear after subvol_uuids+subvol_times
738 * This generation number is used to test if the new fields are valid
739 * and up to date while reading the root item. Everytime the root item
740 * is written out, the "generation" field is copied into this field. If
741 * anyone ever mounted the fs with an older kernel, we will have
742 * mismatching generation values here and thus must invalidate the
743 * new fields. See btrfs_update_root and btrfs_find_last_root for
745 * the offset of generation_v2 is also used as the start for the memset
746 * when invalidating the fields.
748 __le64 generation_v2;
749 u8 uuid[BTRFS_UUID_SIZE];
750 u8 parent_uuid[BTRFS_UUID_SIZE];
751 u8 received_uuid[BTRFS_UUID_SIZE];
752 __le64 ctransid; /* updated when an inode changes */
753 __le64 otransid; /* trans when created */
754 __le64 stransid; /* trans when sent. non-zero for received subvol */
755 __le64 rtransid; /* trans when received. non-zero for received subvol */
756 struct btrfs_timespec ctime;
757 struct btrfs_timespec otime;
758 struct btrfs_timespec stime;
759 struct btrfs_timespec rtime;
760 __le64 reserved[8]; /* for future */
761 } __attribute__ ((__packed__));
764 * this is used for both forward and backward root refs
766 struct btrfs_root_ref {
770 } __attribute__ ((__packed__));
772 #define BTRFS_FILE_EXTENT_INLINE 0
773 #define BTRFS_FILE_EXTENT_REG 1
774 #define BTRFS_FILE_EXTENT_PREALLOC 2
776 struct btrfs_file_extent_item {
778 * transaction id that created this extent
782 * max number of bytes to hold this extent in ram
783 * when we split a compressed extent we can't know how big
784 * each of the resulting pieces will be. So, this is
785 * an upper limit on the size of the extent in ram instead of
791 * 32 bits for the various ways we might encode the data,
792 * including compression and encryption. If any of these
793 * are set to something a given disk format doesn't understand
794 * it is treated like an incompat flag for reading and writing,
799 __le16 other_encoding; /* spare for later use */
801 /* are we inline data or a real extent? */
805 * disk space consumed by the extent, checksum blocks are included
809 __le64 disk_num_bytes;
811 * the logical offset in file blocks (no csums)
812 * this extent record is for. This allows a file extent to point
813 * into the middle of an existing extent on disk, sharing it
814 * between two snapshots (useful if some bytes in the middle of the
815 * extent have changed
819 * the logical number of file blocks (no csums included)
823 } __attribute__ ((__packed__));
825 struct btrfs_csum_item {
827 } __attribute__ ((__packed__));
830 * We don't want to overwrite 1M at the beginning of device, even though
831 * there is our 1st superblock at 64k. Some possible reasons:
832 * - the first 64k blank is useful for some boot loader/manager
833 * - the first 1M could be scratched by buggy partitioner or somesuch
835 #define BTRFS_BLOCK_RESERVED_1M_FOR_SUPER ((u64)1024 * 1024)
837 /* tag for the radix tree of block groups in ram */
838 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
839 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
840 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
841 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
842 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
843 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
844 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
845 #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
846 #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
847 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
849 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
850 BTRFS_BLOCK_GROUP_SYSTEM | \
851 BTRFS_BLOCK_GROUP_METADATA)
853 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
854 BTRFS_BLOCK_GROUP_RAID1 | \
855 BTRFS_BLOCK_GROUP_RAID5 | \
856 BTRFS_BLOCK_GROUP_RAID6 | \
857 BTRFS_BLOCK_GROUP_DUP | \
858 BTRFS_BLOCK_GROUP_RAID10)
860 /* used in struct btrfs_balance_args fields */
861 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
863 #define BTRFS_QGROUP_STATUS_OFF 0
864 #define BTRFS_QGROUP_STATUS_ON 1
865 #define BTRFS_QGROUP_STATUS_SCANNING 2
867 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1 << 0)
869 struct btrfs_qgroup_status_item {
873 __le64 scan; /* progress during scanning */
874 } __attribute__ ((__packed__));
876 struct btrfs_block_group_item {
878 __le64 chunk_objectid;
880 } __attribute__ ((__packed__));
882 struct btrfs_qgroup_info_item {
885 __le64 referenced_compressed;
887 __le64 exclusive_compressed;
888 } __attribute__ ((__packed__));
890 /* flags definition for qgroup limits */
891 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
892 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
893 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
894 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
895 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
896 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
898 struct btrfs_qgroup_limit_item {
900 __le64 max_referenced;
901 __le64 max_exclusive;
902 __le64 rsv_referenced;
903 __le64 rsv_exclusive;
904 } __attribute__ ((__packed__));
906 struct btrfs_space_info {
912 struct list_head list;
915 struct btrfs_block_group_cache {
916 struct cache_extent cache;
917 struct btrfs_key key;
918 struct btrfs_block_group_item item;
919 struct btrfs_space_info *space_info;
920 struct btrfs_free_space_ctl *free_space_ctl;
927 struct btrfs_extent_ops {
928 int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
929 u64 hint_byte, struct btrfs_key *ins);
930 int (*free_extent)(struct btrfs_root *root, u64 bytenr,
935 struct btrfs_fs_devices;
936 struct btrfs_fs_info {
937 u8 fsid[BTRFS_FSID_SIZE];
938 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
939 struct btrfs_root *fs_root;
940 struct btrfs_root *extent_root;
941 struct btrfs_root *tree_root;
942 struct btrfs_root *chunk_root;
943 struct btrfs_root *dev_root;
944 struct btrfs_root *csum_root;
945 struct btrfs_root *quota_root;
947 struct rb_root fs_root_tree;
949 /* the log root tree is a directory of all the other log roots */
950 struct btrfs_root *log_root_tree;
952 struct extent_io_tree extent_cache;
953 struct extent_io_tree free_space_cache;
954 struct extent_io_tree block_group_cache;
955 struct extent_io_tree pinned_extents;
956 struct extent_io_tree pending_del;
957 struct extent_io_tree extent_ins;
959 /* logical->physical extent mapping */
960 struct btrfs_mapping_tree mapping_tree;
963 u64 last_trans_committed;
965 u64 avail_data_alloc_bits;
966 u64 avail_metadata_alloc_bits;
967 u64 avail_system_alloc_bits;
968 u64 data_alloc_profile;
969 u64 metadata_alloc_profile;
970 u64 system_alloc_profile;
973 struct btrfs_trans_handle *running_transaction;
974 struct btrfs_super_block *super_copy;
975 struct mutex fs_mutex;
980 struct btrfs_extent_ops *extent_ops;
981 struct list_head dirty_cowonly_roots;
982 struct list_head recow_ebs;
984 struct btrfs_fs_devices *fs_devices;
985 struct list_head space_info;
988 unsigned int readonly:1;
989 unsigned int on_restoring:1;
990 unsigned int is_chunk_recover:1;
991 unsigned int quota_enabled:1;
993 int (*free_extent_hook)(struct btrfs_trans_handle *trans,
994 struct btrfs_root *root,
995 u64 bytenr, u64 num_bytes, u64 parent,
996 u64 root_objectid, u64 owner, u64 offset,
998 struct cache_tree *fsck_extent_cache;
999 struct cache_tree *corrupt_blocks;
1003 * in ram representation of the tree. extent_root is used for all allocations
1004 * and for the extent tree extent_root root.
1007 struct extent_buffer *node;
1008 struct extent_buffer *commit_root;
1009 struct btrfs_root_item root_item;
1010 struct btrfs_key root_key;
1011 struct btrfs_fs_info *fs_info;
1015 /* data allocations are done in sectorsize units */
1018 /* node allocations are done in nodesize units */
1021 /* leaf allocations are done in leafsize units */
1024 /* leaf allocations are done in leafsize units */
1033 u64 last_inode_alloc;
1035 /* the dirty list is only used by non-reference counted roots */
1036 struct list_head dirty_list;
1037 struct rb_node rb_node;
1041 * inode items have the data typically returned from stat and store other
1042 * info about object characteristics. There is one for every file and dir in
1045 #define BTRFS_INODE_ITEM_KEY 1
1046 #define BTRFS_INODE_REF_KEY 12
1047 #define BTRFS_INODE_EXTREF_KEY 13
1048 #define BTRFS_XATTR_ITEM_KEY 24
1049 #define BTRFS_ORPHAN_ITEM_KEY 48
1051 #define BTRFS_DIR_LOG_ITEM_KEY 60
1052 #define BTRFS_DIR_LOG_INDEX_KEY 72
1054 * dir items are the name -> inode pointers in a directory. There is one
1055 * for every name in a directory.
1057 #define BTRFS_DIR_ITEM_KEY 84
1058 #define BTRFS_DIR_INDEX_KEY 96
1061 * extent data is for file data
1063 #define BTRFS_EXTENT_DATA_KEY 108
1066 * csum items have the checksums for data in the extents
1068 #define BTRFS_CSUM_ITEM_KEY 120
1070 * extent csums are stored in a separate tree and hold csums for
1071 * an entire extent on disk.
1073 #define BTRFS_EXTENT_CSUM_KEY 128
1076 * root items point to tree roots. There are typically in the root
1077 * tree used by the super block to find all the other trees
1079 #define BTRFS_ROOT_ITEM_KEY 132
1082 * root backrefs tie subvols and snapshots to the directory entries that
1085 #define BTRFS_ROOT_BACKREF_KEY 144
1088 * root refs make a fast index for listing all of the snapshots and
1089 * subvolumes referenced by a given root. They point directly to the
1090 * directory item in the root that references the subvol
1092 #define BTRFS_ROOT_REF_KEY 156
1095 * extent items are in the extent map tree. These record which blocks
1096 * are used, and how many references there are to each block
1098 #define BTRFS_EXTENT_ITEM_KEY 168
1101 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
1102 * the length, so we save the level in key->offset instead of the length.
1104 #define BTRFS_METADATA_ITEM_KEY 169
1106 #define BTRFS_TREE_BLOCK_REF_KEY 176
1108 #define BTRFS_EXTENT_DATA_REF_KEY 178
1110 /* old style extent backrefs */
1111 #define BTRFS_EXTENT_REF_V0_KEY 180
1113 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1115 #define BTRFS_SHARED_DATA_REF_KEY 184
1119 * block groups give us hints into the extent allocation trees. Which
1120 * blocks are free etc etc
1122 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1124 #define BTRFS_DEV_EXTENT_KEY 204
1125 #define BTRFS_DEV_ITEM_KEY 216
1126 #define BTRFS_CHUNK_ITEM_KEY 228
1128 #define BTRFS_BALANCE_ITEM_KEY 248
1133 #define BTRFS_QGROUP_STATUS_KEY 240
1134 #define BTRFS_QGROUP_INFO_KEY 242
1135 #define BTRFS_QGROUP_LIMIT_KEY 244
1136 #define BTRFS_QGROUP_RELATION_KEY 246
1139 * Persistently stores the io stats in the device tree.
1140 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
1142 #define BTRFS_DEV_STATS_KEY 249
1145 * Persistently stores the device replace state in the device tree.
1146 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1148 #define BTRFS_DEV_REPLACE_KEY 250
1151 * Stores items that allow to quickly map UUIDs to something else.
1152 * These items are part of the filesystem UUID tree.
1153 * The key is built like this:
1154 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
1156 #if BTRFS_UUID_SIZE != 16
1157 #error "UUID items require BTRFS_UUID_SIZE == 16!"
1159 #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
1160 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
1161 * received subvols */
1164 * string items are for debugging. They just store a short string of
1167 #define BTRFS_STRING_ITEM_KEY 253
1171 #define BTRFS_INODE_NODATASUM (1 << 0)
1172 #define BTRFS_INODE_NODATACOW (1 << 1)
1173 #define BTRFS_INODE_READONLY (1 << 2)
1175 #define read_eb_member(eb, ptr, type, member, result) ( \
1176 read_extent_buffer(eb, (char *)(result), \
1177 ((unsigned long)(ptr)) + \
1178 offsetof(type, member), \
1179 sizeof(((type *)0)->member)))
1181 #define write_eb_member(eb, ptr, type, member, result) ( \
1182 write_extent_buffer(eb, (char *)(result), \
1183 ((unsigned long)(ptr)) + \
1184 offsetof(type, member), \
1185 sizeof(((type *)0)->member)))
1187 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1188 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
1190 const struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1191 return le##bits##_to_cpu(h->member); \
1193 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1196 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1197 h->member = cpu_to_le##bits(val); \
1200 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1201 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
1204 unsigned long offset = (unsigned long)s; \
1205 const type *p = (type *) (eb->data + offset); \
1206 return get_unaligned_le##bits(&p->member); \
1208 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1209 type *s, u##bits val) \
1211 unsigned long offset = (unsigned long)s; \
1212 type *p = (type *) (eb->data + offset); \
1213 put_unaligned_le##bits(val, &p->member); \
1216 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1217 static inline u##bits btrfs_##name(const type *s) \
1219 return le##bits##_to_cpu(s->member); \
1221 static inline void btrfs_set_##name(type *s, u##bits val) \
1223 s->member = cpu_to_le##bits(val); \
1226 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1227 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1228 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1229 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1230 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1231 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1233 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1234 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1235 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1236 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1237 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1238 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1240 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1241 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1243 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1245 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1247 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1249 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1251 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1252 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1254 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1256 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1258 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1261 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1263 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1266 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1268 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1271 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1272 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1273 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1274 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1275 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1276 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1277 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1278 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1279 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1280 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1281 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1283 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1285 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1288 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1289 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1290 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1292 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1294 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1296 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1298 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1299 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1301 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1303 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1304 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1306 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1309 unsigned long offset = (unsigned long)c;
1310 offset += offsetof(struct btrfs_chunk, stripe);
1311 offset += nr * sizeof(struct btrfs_stripe);
1312 return (struct btrfs_stripe *)offset;
1315 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1317 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1320 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1321 struct btrfs_chunk *c, int nr)
1323 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1326 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1327 struct btrfs_chunk *c, int nr,
1330 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1333 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1334 struct btrfs_chunk *c, int nr)
1336 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1339 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1340 struct btrfs_chunk *c, int nr,
1343 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1346 /* struct btrfs_block_group_item */
1347 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1349 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1351 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1352 struct btrfs_block_group_item, chunk_objectid, 64);
1354 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1355 struct btrfs_block_group_item, chunk_objectid, 64);
1356 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1357 struct btrfs_block_group_item, flags, 64);
1358 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1359 struct btrfs_block_group_item, flags, 64);
1361 /* struct btrfs_inode_ref */
1362 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1363 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1364 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1366 /* struct btrfs_inode_extref */
1367 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1368 parent_objectid, 64);
1369 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1371 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1373 /* struct btrfs_inode_item */
1374 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1375 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1376 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1377 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1378 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1379 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1380 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1381 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1382 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1383 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1384 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1385 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1387 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1388 struct btrfs_inode_item, generation, 64);
1389 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1390 struct btrfs_inode_item, generation, 64);
1391 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1392 struct btrfs_inode_item, size, 64);
1393 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1394 struct btrfs_inode_item, nbytes, 64);
1395 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1396 struct btrfs_inode_item, block_group, 64);
1397 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1398 struct btrfs_inode_item, nlink, 32);
1399 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1400 struct btrfs_inode_item, uid, 32);
1401 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1402 struct btrfs_inode_item, gid, 32);
1403 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1404 struct btrfs_inode_item, mode, 32);
1405 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1406 struct btrfs_inode_item, rdev, 64);
1407 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1408 struct btrfs_inode_item, flags, 64);
1410 static inline struct btrfs_timespec *
1411 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1413 unsigned long ptr = (unsigned long)inode_item;
1414 ptr += offsetof(struct btrfs_inode_item, atime);
1415 return (struct btrfs_timespec *)ptr;
1418 static inline struct btrfs_timespec *
1419 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1421 unsigned long ptr = (unsigned long)inode_item;
1422 ptr += offsetof(struct btrfs_inode_item, mtime);
1423 return (struct btrfs_timespec *)ptr;
1426 static inline struct btrfs_timespec *
1427 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1429 unsigned long ptr = (unsigned long)inode_item;
1430 ptr += offsetof(struct btrfs_inode_item, ctime);
1431 return (struct btrfs_timespec *)ptr;
1434 static inline struct btrfs_timespec *
1435 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1437 unsigned long ptr = (unsigned long)inode_item;
1438 ptr += offsetof(struct btrfs_inode_item, otime);
1439 return (struct btrfs_timespec *)ptr;
1442 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1443 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1444 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1446 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1449 /* struct btrfs_dev_extent */
1450 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1452 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1453 chunk_objectid, 64);
1454 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1456 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1458 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1460 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1461 return (u8 *)((unsigned long)dev + ptr);
1465 /* struct btrfs_extent_item */
1466 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1467 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
1468 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1470 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1471 BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
1473 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1475 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1477 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1478 struct btrfs_tree_block_info *item,
1479 struct btrfs_disk_key *key)
1481 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1484 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1485 struct btrfs_tree_block_info *item,
1486 struct btrfs_disk_key *key)
1488 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1491 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1493 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1495 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1497 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1500 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1503 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1505 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1507 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
1508 struct btrfs_extent_inline_ref, type, 8);
1509 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
1510 struct btrfs_extent_inline_ref, offset, 64);
1512 static inline u32 btrfs_extent_inline_ref_size(int type)
1514 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1515 type == BTRFS_SHARED_BLOCK_REF_KEY)
1516 return sizeof(struct btrfs_extent_inline_ref);
1517 if (type == BTRFS_SHARED_DATA_REF_KEY)
1518 return sizeof(struct btrfs_shared_data_ref) +
1519 sizeof(struct btrfs_extent_inline_ref);
1520 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1521 return sizeof(struct btrfs_extent_data_ref) +
1522 offsetof(struct btrfs_extent_inline_ref, offset);
1527 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1528 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1530 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1531 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1533 /* struct btrfs_node */
1534 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1535 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1537 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1540 ptr = offsetof(struct btrfs_node, ptrs) +
1541 sizeof(struct btrfs_key_ptr) * nr;
1542 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1545 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1549 ptr = offsetof(struct btrfs_node, ptrs) +
1550 sizeof(struct btrfs_key_ptr) * nr;
1551 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1554 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1557 ptr = offsetof(struct btrfs_node, ptrs) +
1558 sizeof(struct btrfs_key_ptr) * nr;
1559 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1562 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1566 ptr = offsetof(struct btrfs_node, ptrs) +
1567 sizeof(struct btrfs_key_ptr) * nr;
1568 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1571 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1573 return offsetof(struct btrfs_node, ptrs) +
1574 sizeof(struct btrfs_key_ptr) * nr;
1577 static inline void btrfs_node_key(struct extent_buffer *eb,
1578 struct btrfs_disk_key *disk_key, int nr)
1581 ptr = btrfs_node_key_ptr_offset(nr);
1582 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1583 struct btrfs_key_ptr, key, disk_key);
1586 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1587 struct btrfs_disk_key *disk_key, int nr)
1590 ptr = btrfs_node_key_ptr_offset(nr);
1591 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1592 struct btrfs_key_ptr, key, disk_key);
1595 /* struct btrfs_item */
1596 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1597 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1599 static inline unsigned long btrfs_item_nr_offset(int nr)
1601 return offsetof(struct btrfs_leaf, items) +
1602 sizeof(struct btrfs_item) * nr;
1605 static inline struct btrfs_item *btrfs_item_nr(int nr)
1607 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1610 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1611 struct btrfs_item *item)
1613 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1616 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1618 return btrfs_item_end(eb, btrfs_item_nr(nr));
1621 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1623 return btrfs_item_offset(eb, btrfs_item_nr(nr));
1626 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1628 return btrfs_item_size(eb, btrfs_item_nr(nr));
1631 static inline void btrfs_item_key(struct extent_buffer *eb,
1632 struct btrfs_disk_key *disk_key, int nr)
1634 struct btrfs_item *item = btrfs_item_nr(nr);
1635 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1638 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1639 struct btrfs_disk_key *disk_key, int nr)
1641 struct btrfs_item *item = btrfs_item_nr(nr);
1642 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1645 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1648 * struct btrfs_root_ref
1650 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1651 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1652 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1654 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1655 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1656 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1658 /* struct btrfs_dir_item */
1659 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1660 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1661 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1662 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1664 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1666 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1667 struct btrfs_dir_item *item,
1668 struct btrfs_disk_key *key)
1670 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1673 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1674 struct btrfs_dir_item *item,
1675 struct btrfs_disk_key *key)
1677 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1680 /* struct btrfs_free_space_header */
1681 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1683 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1685 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1688 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1689 struct btrfs_free_space_header *h,
1690 struct btrfs_disk_key *key)
1692 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1695 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1696 struct btrfs_free_space_header *h,
1697 struct btrfs_disk_key *key)
1699 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1702 /* struct btrfs_disk_key */
1703 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1705 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1706 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1708 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1709 struct btrfs_disk_key *disk)
1711 cpu->offset = le64_to_cpu(disk->offset);
1712 cpu->type = disk->type;
1713 cpu->objectid = le64_to_cpu(disk->objectid);
1716 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1717 struct btrfs_key *cpu)
1719 disk->offset = cpu_to_le64(cpu->offset);
1720 disk->type = cpu->type;
1721 disk->objectid = cpu_to_le64(cpu->objectid);
1724 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1725 struct btrfs_key *key, int nr)
1727 struct btrfs_disk_key disk_key;
1728 btrfs_node_key(eb, &disk_key, nr);
1729 btrfs_disk_key_to_cpu(key, &disk_key);
1732 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1733 struct btrfs_key *key, int nr)
1735 struct btrfs_disk_key disk_key;
1736 btrfs_item_key(eb, &disk_key, nr);
1737 btrfs_disk_key_to_cpu(key, &disk_key);
1740 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1741 struct btrfs_dir_item *item,
1742 struct btrfs_key *key)
1744 struct btrfs_disk_key disk_key;
1745 btrfs_dir_item_key(eb, item, &disk_key);
1746 btrfs_disk_key_to_cpu(key, &disk_key);
1750 static inline u8 btrfs_key_type(struct btrfs_key *key)
1755 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1760 /* struct btrfs_header */
1761 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1762 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1764 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1765 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1766 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1767 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1768 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
1769 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
1771 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
1772 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
1775 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1777 return (btrfs_header_flags(eb) & flag) == flag;
1780 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1782 u64 flags = btrfs_header_flags(eb);
1783 btrfs_set_header_flags(eb, flags | flag);
1784 return (flags & flag) == flag;
1787 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1789 u64 flags = btrfs_header_flags(eb);
1790 btrfs_set_header_flags(eb, flags & ~flag);
1791 return (flags & flag) == flag;
1794 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1796 u64 flags = btrfs_header_flags(eb);
1797 return flags >> BTRFS_BACKREF_REV_SHIFT;
1800 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1803 u64 flags = btrfs_header_flags(eb);
1804 flags &= ~BTRFS_BACKREF_REV_MASK;
1805 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1806 btrfs_set_header_flags(eb, flags);
1809 static inline unsigned long btrfs_header_fsid(void)
1811 return offsetof(struct btrfs_header, fsid);
1814 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1816 return offsetof(struct btrfs_header, chunk_tree_uuid);
1819 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1821 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1825 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1827 unsigned long ptr = offsetof(struct btrfs_header, csum);
1831 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1836 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1841 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1846 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1848 return (btrfs_header_level(eb) == 0);
1851 /* struct btrfs_root_item */
1852 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1854 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1855 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1856 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1858 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1860 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1861 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1862 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1863 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1864 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1865 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1866 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1867 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1869 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
1871 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
1873 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
1875 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
1877 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
1880 /* struct btrfs_root_backup */
1881 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
1883 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
1885 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
1886 tree_root_level, 8);
1888 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
1890 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
1891 chunk_root_gen, 64);
1892 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
1893 chunk_root_level, 8);
1895 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
1897 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
1898 extent_root_gen, 64);
1899 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
1900 extent_root_level, 8);
1902 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
1904 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
1906 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
1909 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
1911 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
1913 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
1916 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
1918 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
1920 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
1921 csum_root_level, 8);
1922 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
1924 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
1926 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
1929 /* struct btrfs_super_block */
1931 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1932 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1933 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1935 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1936 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1937 struct btrfs_super_block, sys_chunk_array_size, 32);
1938 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1939 struct btrfs_super_block, chunk_root_generation, 64);
1940 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1942 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1944 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1945 chunk_root_level, 8);
1946 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1948 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1949 log_root_transid, 64);
1950 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1952 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1954 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1956 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1958 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1960 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1962 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1964 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1965 root_dir_objectid, 64);
1966 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1968 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1970 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1971 compat_ro_flags, 64);
1972 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1973 incompat_flags, 64);
1974 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1976 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
1977 cache_generation, 64);
1978 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
1979 uuid_tree_generation, 64);
1980 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
1982 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1984 int t = btrfs_super_csum_type(s);
1985 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1986 return btrfs_csum_sizes[t];
1989 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1991 return offsetof(struct btrfs_leaf, items);
1994 /* struct btrfs_file_extent_item */
1995 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1996 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
1998 static inline unsigned long btrfs_file_extent_inline_start(struct
1999 btrfs_file_extent_item *e)
2001 unsigned long offset = (unsigned long)e;
2002 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2006 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2008 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2011 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2013 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
2015 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2017 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
2019 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2020 disk_num_bytes, 64);
2021 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2023 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
2025 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2027 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
2029 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2031 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
2033 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2035 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
2037 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2039 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2040 other_encoding, 16);
2042 /* btrfs_qgroup_status_item */
2043 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2045 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2047 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2049 BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
2052 /* btrfs_qgroup_info_item */
2053 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2055 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
2057 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
2058 struct btrfs_qgroup_info_item, referenced_compressed, 64);
2059 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
2061 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
2062 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2064 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2065 struct btrfs_qgroup_info_item, generation, 64);
2066 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
2067 struct btrfs_qgroup_info_item, referenced, 64);
2068 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
2069 struct btrfs_qgroup_info_item, referenced_compressed, 64);
2070 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
2071 struct btrfs_qgroup_info_item, exclusive, 64);
2072 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
2073 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2075 /* btrfs_qgroup_limit_item */
2076 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2078 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
2079 max_referenced, 64);
2080 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
2082 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
2083 rsv_referenced, 64);
2084 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
2087 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_flags,
2088 struct btrfs_qgroup_limit_item, flags, 64);
2089 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_referenced,
2090 struct btrfs_qgroup_limit_item, max_referenced, 64);
2091 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_exclusive,
2092 struct btrfs_qgroup_limit_item, max_exclusive, 64);
2093 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
2094 struct btrfs_qgroup_limit_item, rsv_referenced, 64);
2095 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
2096 struct btrfs_qgroup_limit_item, rsv_exclusive, 64);
2099 * this returns the number of bytes used by the item on disk, minus the
2100 * size of any extent headers. If a file is compressed on disk, this is
2101 * the compressed size
2103 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2104 struct btrfs_item *e)
2106 unsigned long offset;
2107 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2108 return btrfs_item_size(eb, e) - offset;
2111 /* this returns the number of file bytes represented by the inline item.
2112 * If an item is compressed, this is the uncompressed size
2114 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2116 struct btrfs_file_extent_item *fi)
2119 * return the space used on disk if this item isn't
2120 * compressed or encoded
2122 if (btrfs_file_extent_compression(eb, fi) == 0 &&
2123 btrfs_file_extent_encryption(eb, fi) == 0 &&
2124 btrfs_file_extent_other_encoding(eb, fi) == 0) {
2125 return btrfs_file_extent_inline_item_len(eb,
2126 btrfs_item_nr(slot));
2129 /* otherwise use the ram bytes field */
2130 return btrfs_file_extent_ram_bytes(eb, fi);
2133 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
2135 return root->leafsize;
2136 return root->nodesize;
2139 static inline int btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
2141 struct btrfs_super_block *disk_super;
2142 disk_super = fs_info->super_copy;
2143 return !!(btrfs_super_incompat_flags(disk_super) & flag);
2146 /* helper function to cast into the data area of the leaf. */
2147 #define btrfs_item_ptr(leaf, slot, type) \
2148 ((type *)(btrfs_leaf_data(leaf) + \
2149 btrfs_item_offset_nr(leaf, slot)))
2151 #define btrfs_item_ptr_offset(leaf, slot) \
2152 ((unsigned long)(btrfs_leaf_data(leaf) + \
2153 btrfs_item_offset_nr(leaf, slot)))
2156 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2157 struct btrfs_root *root,
2158 u64 num_bytes, u64 empty_size,
2159 u64 hint_byte, u64 search_end,
2160 struct btrfs_key *ins, int data);
2161 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
2162 struct btrfs_root *root);
2163 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
2164 void btrfs_unpin_extent(struct btrfs_fs_info *fs_info,
2165 u64 bytenr, u64 num_bytes);
2166 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
2167 struct btrfs_root *root);
2168 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
2169 btrfs_fs_info *info,
2171 struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct
2172 btrfs_fs_info *info,
2174 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2175 struct btrfs_root *root,
2176 u32 blocksize, u64 root_objectid,
2177 struct btrfs_disk_key *key, int level,
2178 u64 hint, u64 empty_size);
2179 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
2180 struct btrfs_root *root,
2181 u64 num_bytes, u64 parent,
2182 u64 root_objectid, u64 ref_generation,
2183 u64 owner, u64 empty_size, u64 hint_byte,
2184 u64 search_end, struct btrfs_key *ins, int data);
2185 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2186 struct btrfs_root *root, u64 bytenr,
2187 u64 offset, int metadata, u64 *refs, u64 *flags);
2188 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
2189 struct btrfs_root *root,
2190 u64 bytenr, int level, u64 flags);
2191 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2192 struct extent_buffer *buf, int record_parent);
2193 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2194 struct extent_buffer *buf, int record_parent);
2195 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2196 struct btrfs_root *root,
2197 u64 bytenr, u64 num_bytes, u64 parent,
2198 u64 root_objectid, u64 owner, u64 offset);
2199 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2200 struct btrfs_root *root,
2201 struct extent_io_tree *unpin);
2202 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2203 struct btrfs_root *root,
2204 u64 bytenr, u64 num_bytes, u64 parent,
2205 u64 root_objectid, u64 ref_generation,
2206 u64 owner_objectid);
2207 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2208 struct btrfs_root *root, u64 bytenr,
2209 u64 orig_parent, u64 parent,
2210 u64 root_objectid, u64 ref_generation,
2211 u64 owner_objectid);
2212 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2213 struct btrfs_root *root);
2214 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2215 int btrfs_read_block_groups(struct btrfs_root *root);
2216 struct btrfs_block_group_cache *
2217 btrfs_add_block_group(struct btrfs_fs_info *fs_info, u64 bytes_used, u64 type,
2218 u64 chunk_objectid, u64 chunk_offset, u64 size);
2219 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2220 struct btrfs_root *root, u64 bytes_used,
2221 u64 type, u64 chunk_objectid, u64 chunk_offset,
2223 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
2224 struct btrfs_root *root);
2225 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
2226 struct btrfs_root *root, u64 bytenr, u64 num,
2227 int alloc, int mark_free);
2228 int btrfs_record_file_extent(struct btrfs_trans_handle *trans,
2229 struct btrfs_root *root, u64 objectid,
2230 struct btrfs_inode_item *inode,
2231 u64 file_pos, u64 disk_bytenr,
2234 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2235 int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2236 struct btrfs_path *path, int level, int slot);
2237 enum btrfs_tree_block_status
2238 btrfs_check_node(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
2239 struct extent_buffer *buf);
2240 enum btrfs_tree_block_status
2241 btrfs_check_leaf(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
2242 struct extent_buffer *buf);
2243 void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
2244 int level, int slot, u64 objectid);
2245 struct extent_buffer *read_node_slot(struct btrfs_root *root,
2246 struct extent_buffer *parent, int slot);
2247 int btrfs_previous_item(struct btrfs_root *root,
2248 struct btrfs_path *path, u64 min_objectid,
2250 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2251 struct btrfs_root *root, struct extent_buffer *buf,
2252 struct extent_buffer *parent, int parent_slot,
2253 struct extent_buffer **cow_ret);
2254 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
2255 struct btrfs_root *root,
2256 struct extent_buffer *buf,
2257 struct extent_buffer *parent, int parent_slot,
2258 struct extent_buffer **cow_ret,
2259 u64 search_start, u64 empty_size);
2260 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2261 struct btrfs_root *root,
2262 struct extent_buffer *buf,
2263 struct extent_buffer **cow_ret, u64 new_root_objectid);
2264 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2265 *root, struct btrfs_path *path, u32 data_size);
2266 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2267 struct btrfs_root *root,
2268 struct btrfs_path *path,
2269 u32 new_size, int from_end);
2270 int btrfs_split_item(struct btrfs_trans_handle *trans,
2271 struct btrfs_root *root,
2272 struct btrfs_path *path,
2273 struct btrfs_key *new_key,
2274 unsigned long split_offset);
2275 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2276 *root, struct btrfs_key *key, struct btrfs_path *p, int
2278 void btrfs_release_path(struct btrfs_path *p);
2279 void add_root_to_dirty_list(struct btrfs_root *root);
2280 struct btrfs_path *btrfs_alloc_path(void);
2281 void btrfs_free_path(struct btrfs_path *p);
2282 void btrfs_init_path(struct btrfs_path *p);
2283 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2284 struct btrfs_path *path, int slot, int nr);
2286 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2287 struct btrfs_root *root,
2288 struct btrfs_path *path)
2290 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2293 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2294 *root, struct btrfs_key *key, void *data, u32 data_size);
2295 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2296 struct btrfs_root *root,
2297 struct btrfs_path *path,
2298 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2300 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2301 struct btrfs_root *root,
2302 struct btrfs_path *path,
2303 struct btrfs_key *key,
2306 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2309 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2310 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2311 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2312 void btrfs_fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
2313 struct btrfs_disk_key *key, int level);
2314 int btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
2315 struct btrfs_key *new_key);
2316 void btrfs_set_item_key_unsafe(struct btrfs_root *root,
2317 struct btrfs_path *path,
2318 struct btrfs_key *new_key);
2321 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2322 struct btrfs_root *tree_root,
2323 u64 root_id, u8 type, u64 ref_id,
2324 u64 dirid, u64 sequence,
2325 const char *name, int name_len);
2326 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2327 *root, struct btrfs_key *key, struct btrfs_root_item
2329 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2330 *root, struct btrfs_key *key, struct btrfs_root_item
2332 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2333 btrfs_root_item *item, struct btrfs_key *key);
2335 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
2336 *root, const char *name, int name_len, u64 dir,
2337 struct btrfs_key *location, u8 type, u64 index);
2338 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2339 struct btrfs_root *root,
2340 struct btrfs_path *path, u64 dir,
2341 const char *name, int name_len,
2343 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2344 struct btrfs_root *root, const char *name,
2345 u16 name_len, const void *data, u16 data_len,
2348 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2349 struct btrfs_root *fs_root,
2350 u64 dirid, u64 *objectid);
2353 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2354 struct btrfs_root *root,
2355 const char *name, int name_len,
2356 u64 inode_objectid, u64 ref_objectid, u64 index);
2357 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2358 *root, u64 objectid, struct btrfs_inode_item
2360 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2361 *root, struct btrfs_path *path,
2362 struct btrfs_key *location, int mod);
2365 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2366 struct btrfs_root *root, u64 bytenr, u64 len);
2367 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2368 struct btrfs_root *root,
2369 u64 objectid, u64 pos, u64 offset,
2372 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
2373 struct btrfs_root *root, u64 objectid,
2374 u64 offset, char *buffer, size_t size);
2375 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
2376 struct btrfs_root *root, u64 alloc_end,
2377 u64 bytenr, char *data, size_t len);
2378 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2379 struct btrfs_root *root, struct btrfs_path *path,
2383 int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id);
2384 int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
2387 static inline int is_fstree(u64 rootid)
2389 if (rootid == BTRFS_FS_TREE_OBJECTID ||
2390 (signed long long)rootid >= (signed long long)BTRFS_FIRST_FREE_OBJECTID)