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_LEVEL 8
45 #define BTRFS_COMPAT_EXTENT_TREE_V0
47 /* holds pointers to all of the tree roots */
48 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
50 /* stores information about which extents are in use, and reference counts */
51 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
54 * chunk tree stores translations from logical -> physical block numbering
55 * the super block points to the chunk tree
57 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
60 * stores information about which areas of a given device are in use.
61 * one per device. The tree of tree roots points to the device tree
63 #define BTRFS_DEV_TREE_OBJECTID 4ULL
65 /* one per subvolume, storing files and directories */
66 #define BTRFS_FS_TREE_OBJECTID 5ULL
68 /* directory objectid inside the root tree */
69 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
70 /* holds checksums of all the data extents */
71 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
72 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
74 /* for storing items that use the BTRFS_UUID_KEY* */
75 #define BTRFS_UUID_TREE_OBJECTID 9ULL
77 /* for storing balance parameters in the root tree */
78 #define BTRFS_BALANCE_OBJECTID -4ULL
80 /* oprhan objectid for tracking unlinked/truncated files */
81 #define BTRFS_ORPHAN_OBJECTID -5ULL
83 /* does write ahead logging to speed up fsyncs */
84 #define BTRFS_TREE_LOG_OBJECTID -6ULL
85 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
88 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
89 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
92 * extent checksums all have this objectid
93 * this allows them to share the logging tree
96 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
98 /* For storing free space cache */
99 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
102 * The inode number assigned to the special inode for sotring
105 #define BTRFS_FREE_INO_OBJECTID -12ULL
107 /* dummy objectid represents multiple objectids */
108 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
111 * All files have objectids in this range.
113 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
114 #define BTRFS_LAST_FREE_OBJECTID -256ULL
115 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
120 * the device items go into the chunk tree. The key is in the form
121 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
123 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
126 * the max metadata block size. This limit is somewhat artificial,
127 * but the memmove costs go through the roof for larger blocks.
129 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
132 * we can actually store much bigger names, but lets not confuse the rest
135 #define BTRFS_NAME_LEN 255
138 * Theoretical limit is larger, but we keep this down to a sane
139 * value. That should limit greatly the possibility of collisions on
142 #define BTRFS_LINK_MAX 65535U
144 /* 32 bytes in various csum fields */
145 #define BTRFS_CSUM_SIZE 32
148 #define BTRFS_CSUM_TYPE_CRC32 0
150 static int btrfs_csum_sizes[] = { 4, 0 };
152 /* four bytes for CRC32 */
153 #define BTRFS_CRC32_SIZE 4
154 #define BTRFS_EMPTY_DIR_SIZE 0
156 #define BTRFS_FT_UNKNOWN 0
157 #define BTRFS_FT_REG_FILE 1
158 #define BTRFS_FT_DIR 2
159 #define BTRFS_FT_CHRDEV 3
160 #define BTRFS_FT_BLKDEV 4
161 #define BTRFS_FT_FIFO 5
162 #define BTRFS_FT_SOCK 6
163 #define BTRFS_FT_SYMLINK 7
164 #define BTRFS_FT_XATTR 8
165 #define BTRFS_FT_MAX 9
167 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
170 * the key defines the order in the tree, and so it also defines (optimal)
171 * block layout. objectid corresonds to the inode number. The flags
172 * tells us things about the object, and is a kind of stream selector.
173 * so for a given inode, keys with flags of 1 might refer to the inode
174 * data, flags of 2 may point to file data in the btree and flags == 3
175 * may point to extents.
177 * offset is the starting byte offset for this key in the stream.
179 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
180 * in cpu native order. Otherwise they are identical and their sizes
181 * should be the same (ie both packed)
183 struct btrfs_disk_key {
187 } __attribute__ ((__packed__));
193 } __attribute__ ((__packed__));
195 struct btrfs_mapping_tree {
196 struct cache_tree cache_tree;
199 #define BTRFS_UUID_SIZE 16
200 struct btrfs_dev_item {
201 /* the internal btrfs device id */
204 /* size of the device */
210 /* optimal io alignment for this device */
213 /* optimal io width for this device */
216 /* minimal io size for this device */
219 /* type and info about this device */
222 /* expected generation for this device */
226 * starting byte of this partition on the device,
227 * to allowr for stripe alignment in the future
231 /* grouping information for allocation decisions */
234 /* seek speed 0-100 where 100 is fastest */
237 /* bandwidth 0-100 where 100 is fastest */
240 /* btrfs generated uuid for this device */
241 u8 uuid[BTRFS_UUID_SIZE];
243 /* uuid of FS who owns this device */
244 u8 fsid[BTRFS_UUID_SIZE];
245 } __attribute__ ((__packed__));
247 struct btrfs_stripe {
250 u8 dev_uuid[BTRFS_UUID_SIZE];
251 } __attribute__ ((__packed__));
254 /* size of this chunk in bytes */
257 /* objectid of the root referencing this chunk */
263 /* optimal io alignment for this chunk */
266 /* optimal io width for this chunk */
269 /* minimal io size for this chunk */
272 /* 2^16 stripes is quite a lot, a second limit is the size of a single
277 /* sub stripes only matter for raid10 */
279 struct btrfs_stripe stripe;
280 /* additional stripes go here */
281 } __attribute__ ((__packed__));
283 #define BTRFS_FREE_SPACE_EXTENT 1
284 #define BTRFS_FREE_SPACE_BITMAP 2
286 struct btrfs_free_space_entry {
290 } __attribute__ ((__packed__));
292 struct btrfs_free_space_header {
293 struct btrfs_disk_key location;
297 } __attribute__ ((__packed__));
299 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
301 BUG_ON(num_stripes == 0);
302 return sizeof(struct btrfs_chunk) +
303 sizeof(struct btrfs_stripe) * (num_stripes - 1);
306 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
307 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
308 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
309 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
311 #define BTRFS_BACKREF_REV_MAX 256
312 #define BTRFS_BACKREF_REV_SHIFT 56
313 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
314 BTRFS_BACKREF_REV_SHIFT)
316 #define BTRFS_OLD_BACKREF_REV 0
317 #define BTRFS_MIXED_BACKREF_REV 1
320 * every tree block (leaf or node) starts with this header.
322 struct btrfs_header {
323 /* these first four must match the super block */
324 u8 csum[BTRFS_CSUM_SIZE];
325 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
326 __le64 bytenr; /* which block this node is supposed to live in */
329 /* allowed to be different from the super from here on down */
330 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
335 } __attribute__ ((__packed__));
337 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
338 sizeof(struct btrfs_header)) / \
339 sizeof(struct btrfs_key_ptr))
340 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
341 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
342 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
343 sizeof(struct btrfs_item) - \
344 sizeof(struct btrfs_file_extent_item))
345 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
346 sizeof(struct btrfs_item) -\
347 sizeof(struct btrfs_dir_item))
351 * this is a very generous portion of the super block, giving us
352 * room to translate 14 chunks with 3 stripes each.
354 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
355 #define BTRFS_LABEL_SIZE 256
358 * just in case we somehow lose the roots and are not able to mount,
359 * we store an array of the roots from previous transactions
362 #define BTRFS_NUM_BACKUP_ROOTS 4
363 struct btrfs_root_backup {
365 __le64 tree_root_gen;
368 __le64 chunk_root_gen;
371 __le64 extent_root_gen;
380 __le64 csum_root_gen;
390 u8 extent_root_level;
394 /* future and to align */
396 } __attribute__ ((__packed__));
399 * the super block basically lists the main trees of the FS
400 * it currently lacks any block count etc etc
402 struct btrfs_super_block {
403 u8 csum[BTRFS_CSUM_SIZE];
404 /* the first 3 fields must match struct btrfs_header */
405 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
406 __le64 bytenr; /* this block number */
409 /* allowed to be different from the btrfs_header from here own down */
416 /* this will help find the new super based on the log root */
417 __le64 log_root_transid;
420 __le64 root_dir_objectid;
426 __le32 sys_chunk_array_size;
427 __le64 chunk_root_generation;
429 __le64 compat_ro_flags;
430 __le64 incompat_flags;
435 struct btrfs_dev_item dev_item;
437 char label[BTRFS_LABEL_SIZE];
439 __le64 cache_generation;
440 __le64 uuid_tree_generation;
442 /* future expansion */
444 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
445 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
446 } __attribute__ ((__packed__));
449 * Compat flags that we support. If any incompat flags are set other than the
450 * ones specified below then we will fail to mount
452 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
453 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
454 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
455 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
458 * some patches floated around with a second compression method
459 * lets save that incompat here for when they do get in
460 * Note we don't actually support it, we're just reserving the
463 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
466 * older kernels tried to do bigger metadata blocks, but the
467 * code was pretty buggy. Lets not let them try anymore.
469 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
470 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
471 #define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
472 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
475 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
476 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
477 #define BTRFS_FEATURE_INCOMPAT_SUPP \
478 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
479 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
480 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
481 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
482 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
483 BTRFS_FEATURE_INCOMPAT_RAID56 | \
484 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
485 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
488 * A leaf is full of items. offset and size tell us where to find
489 * the item in the leaf (relative to the start of the data area)
492 struct btrfs_disk_key key;
495 } __attribute__ ((__packed__));
498 * leaves have an item area and a data area:
499 * [item0, item1....itemN] [free space] [dataN...data1, data0]
501 * The data is separate from the items to get the keys closer together
505 struct btrfs_header header;
506 struct btrfs_item items[];
507 } __attribute__ ((__packed__));
510 * all non-leaf blocks are nodes, they hold only keys and pointers to
513 struct btrfs_key_ptr {
514 struct btrfs_disk_key key;
517 } __attribute__ ((__packed__));
520 struct btrfs_header header;
521 struct btrfs_key_ptr ptrs[];
522 } __attribute__ ((__packed__));
525 * btrfs_paths remember the path taken from the root down to the leaf.
526 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
527 * to any other levels that are present.
529 * The slots array records the index of the item or block pointer
530 * used while walking the tree.
534 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
535 int slots[BTRFS_MAX_LEVEL];
536 /* if there is real range locking, this locks field will change */
537 int locks[BTRFS_MAX_LEVEL];
539 /* keep some upper locks as we walk down */
543 * set by btrfs_split_item, tells search_slot to keep all locks
544 * and to force calls to keep space in the nodes
546 unsigned int search_for_split:1;
547 unsigned int keep_locks:1;
548 unsigned int skip_locking:1;
549 unsigned int leave_spinning:1;
553 * items in the extent btree are used to record the objectid of the
554 * owner of the block and the number of references
557 struct btrfs_extent_item {
561 } __attribute__ ((__packed__));
563 struct btrfs_extent_item_v0 {
565 } __attribute__ ((__packed__));
567 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
568 sizeof(struct btrfs_item))
570 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
571 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
573 /* following flags only apply to tree blocks */
575 /* use full backrefs for extent pointers in the block*/
576 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
578 struct btrfs_tree_block_info {
579 struct btrfs_disk_key key;
581 } __attribute__ ((__packed__));
583 struct btrfs_extent_data_ref {
588 } __attribute__ ((__packed__));
590 struct btrfs_shared_data_ref {
592 } __attribute__ ((__packed__));
594 struct btrfs_extent_inline_ref {
597 } __attribute__ ((__packed__));
599 struct btrfs_extent_ref_v0 {
604 } __attribute__ ((__packed__));
606 /* dev extents record free space on individual devices. The owner
607 * field points back to the chunk allocation mapping tree that allocated
608 * the extent. The chunk tree uuid field is a way to double check the owner
610 struct btrfs_dev_extent {
612 __le64 chunk_objectid;
615 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
616 } __attribute__ ((__packed__));
618 struct btrfs_inode_ref {
622 } __attribute__ ((__packed__));
624 struct btrfs_inode_extref {
625 __le64 parent_objectid;
628 __u8 name[0]; /* name goes here */
629 } __attribute__ ((__packed__));
631 struct btrfs_timespec {
634 } __attribute__ ((__packed__));
637 BTRFS_COMPRESS_NONE = 0,
638 BTRFS_COMPRESS_ZLIB = 1,
639 BTRFS_COMPRESS_LZO = 2,
640 BTRFS_COMPRESS_TYPES = 2,
641 BTRFS_COMPRESS_LAST = 3,
642 } btrfs_compression_type;
644 /* we don't understand any encryption methods right now */
646 BTRFS_ENCRYPTION_NONE = 0,
647 BTRFS_ENCRYPTION_LAST = 1,
648 } btrfs_encryption_type;
650 struct btrfs_inode_item {
651 /* nfs style generation number */
653 /* transid that last touched this inode */
665 /* modification sequence number for NFS */
669 * a little future expansion, for more than this we can
670 * just grow the inode item and version it
673 struct btrfs_timespec atime;
674 struct btrfs_timespec ctime;
675 struct btrfs_timespec mtime;
676 struct btrfs_timespec otime;
677 } __attribute__ ((__packed__));
679 struct btrfs_dir_log_item {
681 } __attribute__ ((__packed__));
683 struct btrfs_dir_item {
684 struct btrfs_disk_key location;
689 } __attribute__ ((__packed__));
691 struct btrfs_root_item_v0 {
692 struct btrfs_inode_item inode;
698 __le64 last_snapshot;
701 struct btrfs_disk_key drop_progress;
704 } __attribute__ ((__packed__));
706 struct btrfs_root_item {
707 struct btrfs_inode_item inode;
713 __le64 last_snapshot;
716 struct btrfs_disk_key drop_progress;
721 * The following fields appear after subvol_uuids+subvol_times
726 * This generation number is used to test if the new fields are valid
727 * and up to date while reading the root item. Everytime the root item
728 * is written out, the "generation" field is copied into this field. If
729 * anyone ever mounted the fs with an older kernel, we will have
730 * mismatching generation values here and thus must invalidate the
731 * new fields. See btrfs_update_root and btrfs_find_last_root for
733 * the offset of generation_v2 is also used as the start for the memset
734 * when invalidating the fields.
736 __le64 generation_v2;
737 u8 uuid[BTRFS_UUID_SIZE];
738 u8 parent_uuid[BTRFS_UUID_SIZE];
739 u8 received_uuid[BTRFS_UUID_SIZE];
740 __le64 ctransid; /* updated when an inode changes */
741 __le64 otransid; /* trans when created */
742 __le64 stransid; /* trans when sent. non-zero for received subvol */
743 __le64 rtransid; /* trans when received. non-zero for received subvol */
744 struct btrfs_timespec ctime;
745 struct btrfs_timespec otime;
746 struct btrfs_timespec stime;
747 struct btrfs_timespec rtime;
748 __le64 reserved[8]; /* for future */
749 } __attribute__ ((__packed__));
752 * this is used for both forward and backward root refs
754 struct btrfs_root_ref {
758 } __attribute__ ((__packed__));
760 #define BTRFS_FILE_EXTENT_INLINE 0
761 #define BTRFS_FILE_EXTENT_REG 1
762 #define BTRFS_FILE_EXTENT_PREALLOC 2
764 struct btrfs_file_extent_item {
766 * transaction id that created this extent
770 * max number of bytes to hold this extent in ram
771 * when we split a compressed extent we can't know how big
772 * each of the resulting pieces will be. So, this is
773 * an upper limit on the size of the extent in ram instead of
779 * 32 bits for the various ways we might encode the data,
780 * including compression and encryption. If any of these
781 * are set to something a given disk format doesn't understand
782 * it is treated like an incompat flag for reading and writing,
787 __le16 other_encoding; /* spare for later use */
789 /* are we inline data or a real extent? */
793 * disk space consumed by the extent, checksum blocks are included
797 __le64 disk_num_bytes;
799 * the logical offset in file blocks (no csums)
800 * this extent record is for. This allows a file extent to point
801 * into the middle of an existing extent on disk, sharing it
802 * between two snapshots (useful if some bytes in the middle of the
803 * extent have changed
807 * the logical number of file blocks (no csums included)
811 } __attribute__ ((__packed__));
813 struct btrfs_csum_item {
815 } __attribute__ ((__packed__));
818 * We don't want to overwrite 1M at the beginning of device, even though
819 * there is our 1st superblock at 64k. Some possible reasons:
820 * - the first 64k blank is useful for some boot loader/manager
821 * - the first 1M could be scratched by buggy partitioner or somesuch
823 #define BTRFS_BLOCK_RESERVED_1M_FOR_SUPER ((u64)1024 * 1024)
825 /* tag for the radix tree of block groups in ram */
826 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
827 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
828 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
829 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
830 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
831 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
832 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
833 #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
834 #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
835 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
837 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
838 BTRFS_BLOCK_GROUP_SYSTEM | \
839 BTRFS_BLOCK_GROUP_METADATA)
841 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
842 BTRFS_BLOCK_GROUP_RAID1 | \
843 BTRFS_BLOCK_GROUP_RAID5 | \
844 BTRFS_BLOCK_GROUP_RAID6 | \
845 BTRFS_BLOCK_GROUP_DUP | \
846 BTRFS_BLOCK_GROUP_RAID10)
848 /* used in struct btrfs_balance_args fields */
849 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
851 #define BTRFS_QGROUP_STATUS_OFF 0
852 #define BTRFS_QGROUP_STATUS_ON 1
853 #define BTRFS_QGROUP_STATUS_SCANNING 2
855 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1 << 0)
857 struct btrfs_qgroup_status_item {
861 __le64 scan; /* progress during scanning */
862 } __attribute__ ((__packed__));
864 struct btrfs_block_group_item {
866 __le64 chunk_objectid;
868 } __attribute__ ((__packed__));
870 struct btrfs_qgroup_info_item {
873 __le64 referenced_compressed;
875 __le64 exclusive_compressed;
876 } __attribute__ ((__packed__));
878 /* flags definition for qgroup limits */
879 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
880 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
881 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
882 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
883 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
884 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
886 struct btrfs_qgroup_limit_item {
888 __le64 max_referenced;
889 __le64 max_exclusive;
890 __le64 rsv_referenced;
891 __le64 rsv_exclusive;
892 } __attribute__ ((__packed__));
894 struct btrfs_space_info {
900 struct list_head list;
903 struct btrfs_block_group_cache {
904 struct cache_extent cache;
905 struct btrfs_key key;
906 struct btrfs_block_group_item item;
907 struct btrfs_space_info *space_info;
908 struct btrfs_free_space_ctl *free_space_ctl;
915 struct btrfs_extent_ops {
916 int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
917 u64 hint_byte, struct btrfs_key *ins);
918 int (*free_extent)(struct btrfs_root *root, u64 bytenr,
923 struct btrfs_fs_devices;
924 struct btrfs_fs_info {
925 u8 fsid[BTRFS_FSID_SIZE];
926 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
927 struct btrfs_root *fs_root;
928 struct btrfs_root *extent_root;
929 struct btrfs_root *tree_root;
930 struct btrfs_root *chunk_root;
931 struct btrfs_root *dev_root;
932 struct btrfs_root *csum_root;
934 struct rb_root fs_root_tree;
936 /* the log root tree is a directory of all the other log roots */
937 struct btrfs_root *log_root_tree;
939 struct extent_io_tree extent_cache;
940 struct extent_io_tree free_space_cache;
941 struct extent_io_tree block_group_cache;
942 struct extent_io_tree pinned_extents;
943 struct extent_io_tree pending_del;
944 struct extent_io_tree extent_ins;
946 /* logical->physical extent mapping */
947 struct btrfs_mapping_tree mapping_tree;
950 u64 last_trans_committed;
952 u64 avail_data_alloc_bits;
953 u64 avail_metadata_alloc_bits;
954 u64 avail_system_alloc_bits;
955 u64 data_alloc_profile;
956 u64 metadata_alloc_profile;
957 u64 system_alloc_profile;
960 struct btrfs_trans_handle *running_transaction;
961 struct btrfs_super_block *super_copy;
962 struct mutex fs_mutex;
967 struct btrfs_extent_ops *extent_ops;
968 struct list_head dirty_cowonly_roots;
970 struct btrfs_fs_devices *fs_devices;
971 struct list_head space_info;
975 int (*free_extent_hook)(struct btrfs_trans_handle *trans,
976 struct btrfs_root *root,
977 u64 bytenr, u64 num_bytes, u64 parent,
978 u64 root_objectid, u64 owner, u64 offset,
980 struct cache_tree *fsck_extent_cache;
981 struct cache_tree *corrupt_blocks;
985 * in ram representation of the tree. extent_root is used for all allocations
986 * and for the extent tree extent_root root.
989 struct extent_buffer *node;
990 struct extent_buffer *commit_root;
991 struct btrfs_root_item root_item;
992 struct btrfs_key root_key;
993 struct btrfs_fs_info *fs_info;
997 /* data allocations are done in sectorsize units */
1000 /* node allocations are done in nodesize units */
1003 /* leaf allocations are done in leafsize units */
1006 /* leaf allocations are done in leafsize units */
1015 u64 last_inode_alloc;
1017 /* the dirty list is only used by non-reference counted roots */
1018 struct list_head dirty_list;
1019 struct rb_node rb_node;
1023 * inode items have the data typically returned from stat and store other
1024 * info about object characteristics. There is one for every file and dir in
1027 #define BTRFS_INODE_ITEM_KEY 1
1028 #define BTRFS_INODE_REF_KEY 12
1029 #define BTRFS_INODE_EXTREF_KEY 13
1030 #define BTRFS_XATTR_ITEM_KEY 24
1031 #define BTRFS_ORPHAN_ITEM_KEY 48
1033 #define BTRFS_DIR_LOG_ITEM_KEY 60
1034 #define BTRFS_DIR_LOG_INDEX_KEY 72
1036 * dir items are the name -> inode pointers in a directory. There is one
1037 * for every name in a directory.
1039 #define BTRFS_DIR_ITEM_KEY 84
1040 #define BTRFS_DIR_INDEX_KEY 96
1043 * extent data is for file data
1045 #define BTRFS_EXTENT_DATA_KEY 108
1048 * csum items have the checksums for data in the extents
1050 #define BTRFS_CSUM_ITEM_KEY 120
1052 * extent csums are stored in a separate tree and hold csums for
1053 * an entire extent on disk.
1055 #define BTRFS_EXTENT_CSUM_KEY 128
1058 * root items point to tree roots. There are typically in the root
1059 * tree used by the super block to find all the other trees
1061 #define BTRFS_ROOT_ITEM_KEY 132
1064 * root backrefs tie subvols and snapshots to the directory entries that
1067 #define BTRFS_ROOT_BACKREF_KEY 144
1070 * root refs make a fast index for listing all of the snapshots and
1071 * subvolumes referenced by a given root. They point directly to the
1072 * directory item in the root that references the subvol
1074 #define BTRFS_ROOT_REF_KEY 156
1077 * extent items are in the extent map tree. These record which blocks
1078 * are used, and how many references there are to each block
1080 #define BTRFS_EXTENT_ITEM_KEY 168
1083 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
1084 * the length, so we save the level in key->offset instead of the length.
1086 #define BTRFS_METADATA_ITEM_KEY 169
1088 #define BTRFS_TREE_BLOCK_REF_KEY 176
1090 #define BTRFS_EXTENT_DATA_REF_KEY 178
1092 /* old style extent backrefs */
1093 #define BTRFS_EXTENT_REF_V0_KEY 180
1095 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1097 #define BTRFS_SHARED_DATA_REF_KEY 184
1101 * block groups give us hints into the extent allocation trees. Which
1102 * blocks are free etc etc
1104 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1106 #define BTRFS_DEV_EXTENT_KEY 204
1107 #define BTRFS_DEV_ITEM_KEY 216
1108 #define BTRFS_CHUNK_ITEM_KEY 228
1110 #define BTRFS_BALANCE_ITEM_KEY 248
1115 #define BTRFS_QGROUP_STATUS_KEY 240
1116 #define BTRFS_QGROUP_INFO_KEY 242
1117 #define BTRFS_QGROUP_LIMIT_KEY 244
1118 #define BTRFS_QGROUP_RELATION_KEY 246
1121 * Persistently stores the io stats in the device tree.
1122 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
1124 #define BTRFS_DEV_STATS_KEY 249
1127 * Persistently stores the device replace state in the device tree.
1128 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
1130 #define BTRFS_DEV_REPLACE_KEY 250
1133 * Stores items that allow to quickly map UUIDs to something else.
1134 * These items are part of the filesystem UUID tree.
1135 * The key is built like this:
1136 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
1138 #if BTRFS_UUID_SIZE != 16
1139 #error "UUID items require BTRFS_UUID_SIZE == 16!"
1141 #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
1142 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
1143 * received subvols */
1146 * string items are for debugging. They just store a short string of
1149 #define BTRFS_STRING_ITEM_KEY 253
1153 #define BTRFS_INODE_NODATASUM (1 << 0)
1154 #define BTRFS_INODE_NODATACOW (1 << 1)
1155 #define BTRFS_INODE_READONLY (1 << 2)
1157 #define read_eb_member(eb, ptr, type, member, result) ( \
1158 read_extent_buffer(eb, (char *)(result), \
1159 ((unsigned long)(ptr)) + \
1160 offsetof(type, member), \
1161 sizeof(((type *)0)->member)))
1163 #define write_eb_member(eb, ptr, type, member, result) ( \
1164 write_extent_buffer(eb, (char *)(result), \
1165 ((unsigned long)(ptr)) + \
1166 offsetof(type, member), \
1167 sizeof(((type *)0)->member)))
1169 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1170 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1172 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1173 return le##bits##_to_cpu(h->member); \
1175 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1178 struct btrfs_header *h = (struct btrfs_header *)eb->data; \
1179 h->member = cpu_to_le##bits(val); \
1182 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1183 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
1186 unsigned long offset = (unsigned long)s; \
1187 type *p = (type *) (eb->data + offset); \
1188 return get_unaligned_le##bits(&p->member); \
1190 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1191 type *s, u##bits val) \
1193 unsigned long offset = (unsigned long)s; \
1194 type *p = (type *) (eb->data + offset); \
1195 put_unaligned_le##bits(val, &p->member); \
1198 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1199 static inline u##bits btrfs_##name(type *s) \
1201 return le##bits##_to_cpu(s->member); \
1203 static inline void btrfs_set_##name(type *s, u##bits val) \
1205 s->member = cpu_to_le##bits(val); \
1208 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1209 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1210 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1211 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1212 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1213 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1215 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1216 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1217 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1218 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1219 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1220 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1222 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1223 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1225 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1227 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1229 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1231 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1233 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1234 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1236 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1238 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1240 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1243 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1245 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1248 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1250 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1253 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1254 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1255 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1256 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1257 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1258 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1259 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1260 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1261 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1262 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1263 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1265 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1267 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1270 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1271 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1272 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1274 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1276 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1278 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1280 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1281 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1283 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1285 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1286 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1288 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1291 unsigned long offset = (unsigned long)c;
1292 offset += offsetof(struct btrfs_chunk, stripe);
1293 offset += nr * sizeof(struct btrfs_stripe);
1294 return (struct btrfs_stripe *)offset;
1297 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1299 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1302 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1303 struct btrfs_chunk *c, int nr)
1305 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1308 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1309 struct btrfs_chunk *c, int nr,
1312 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1315 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1316 struct btrfs_chunk *c, int nr)
1318 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1321 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1322 struct btrfs_chunk *c, int nr,
1325 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1328 /* struct btrfs_block_group_item */
1329 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1331 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1333 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1334 struct btrfs_block_group_item, chunk_objectid, 64);
1336 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1337 struct btrfs_block_group_item, chunk_objectid, 64);
1338 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1339 struct btrfs_block_group_item, flags, 64);
1340 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1341 struct btrfs_block_group_item, flags, 64);
1343 /* struct btrfs_inode_ref */
1344 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1345 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1346 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1348 /* struct btrfs_inode_extref */
1349 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1350 parent_objectid, 64);
1351 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1353 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1355 /* struct btrfs_inode_item */
1356 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1357 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1358 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1359 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1360 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1361 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1362 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1363 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1364 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1365 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1366 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1367 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1369 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
1370 struct btrfs_inode_item, generation, 64);
1371 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
1372 struct btrfs_inode_item, generation, 64);
1373 BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
1374 struct btrfs_inode_item, size, 64);
1375 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
1376 struct btrfs_inode_item, nbytes, 64);
1377 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
1378 struct btrfs_inode_item, block_group, 64);
1379 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
1380 struct btrfs_inode_item, nlink, 32);
1381 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
1382 struct btrfs_inode_item, uid, 32);
1383 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
1384 struct btrfs_inode_item, gid, 32);
1385 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
1386 struct btrfs_inode_item, mode, 32);
1387 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
1388 struct btrfs_inode_item, rdev, 64);
1389 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
1390 struct btrfs_inode_item, flags, 64);
1392 static inline struct btrfs_timespec *
1393 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1395 unsigned long ptr = (unsigned long)inode_item;
1396 ptr += offsetof(struct btrfs_inode_item, atime);
1397 return (struct btrfs_timespec *)ptr;
1400 static inline struct btrfs_timespec *
1401 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1403 unsigned long ptr = (unsigned long)inode_item;
1404 ptr += offsetof(struct btrfs_inode_item, mtime);
1405 return (struct btrfs_timespec *)ptr;
1408 static inline struct btrfs_timespec *
1409 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1411 unsigned long ptr = (unsigned long)inode_item;
1412 ptr += offsetof(struct btrfs_inode_item, ctime);
1413 return (struct btrfs_timespec *)ptr;
1416 static inline struct btrfs_timespec *
1417 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1419 unsigned long ptr = (unsigned long)inode_item;
1420 ptr += offsetof(struct btrfs_inode_item, otime);
1421 return (struct btrfs_timespec *)ptr;
1424 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1425 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1426 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
1428 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
1431 /* struct btrfs_dev_extent */
1432 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1434 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1435 chunk_objectid, 64);
1436 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1438 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1440 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1442 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1443 return (u8 *)((unsigned long)dev + ptr);
1447 /* struct btrfs_extent_item */
1448 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1449 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
1450 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1452 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1453 BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
1455 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1457 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1459 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1460 struct btrfs_tree_block_info *item,
1461 struct btrfs_disk_key *key)
1463 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1466 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1467 struct btrfs_tree_block_info *item,
1468 struct btrfs_disk_key *key)
1470 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1473 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1475 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1477 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1479 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1482 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1485 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1487 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1489 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
1490 struct btrfs_extent_inline_ref, type, 8);
1491 BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
1492 struct btrfs_extent_inline_ref, offset, 64);
1494 static inline u32 btrfs_extent_inline_ref_size(int type)
1496 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1497 type == BTRFS_SHARED_BLOCK_REF_KEY)
1498 return sizeof(struct btrfs_extent_inline_ref);
1499 if (type == BTRFS_SHARED_DATA_REF_KEY)
1500 return sizeof(struct btrfs_shared_data_ref) +
1501 sizeof(struct btrfs_extent_inline_ref);
1502 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1503 return sizeof(struct btrfs_extent_data_ref) +
1504 offsetof(struct btrfs_extent_inline_ref, offset);
1509 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1510 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1512 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1513 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1515 /* struct btrfs_node */
1516 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1517 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1519 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1522 ptr = offsetof(struct btrfs_node, ptrs) +
1523 sizeof(struct btrfs_key_ptr) * nr;
1524 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1527 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1531 ptr = offsetof(struct btrfs_node, ptrs) +
1532 sizeof(struct btrfs_key_ptr) * nr;
1533 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1536 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1539 ptr = offsetof(struct btrfs_node, ptrs) +
1540 sizeof(struct btrfs_key_ptr) * nr;
1541 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1544 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1548 ptr = offsetof(struct btrfs_node, ptrs) +
1549 sizeof(struct btrfs_key_ptr) * nr;
1550 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1553 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1555 return offsetof(struct btrfs_node, ptrs) +
1556 sizeof(struct btrfs_key_ptr) * nr;
1559 static inline void btrfs_node_key(struct extent_buffer *eb,
1560 struct btrfs_disk_key *disk_key, int nr)
1563 ptr = btrfs_node_key_ptr_offset(nr);
1564 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1565 struct btrfs_key_ptr, key, disk_key);
1568 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1569 struct btrfs_disk_key *disk_key, int nr)
1572 ptr = btrfs_node_key_ptr_offset(nr);
1573 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1574 struct btrfs_key_ptr, key, disk_key);
1577 /* struct btrfs_item */
1578 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1579 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1581 static inline unsigned long btrfs_item_nr_offset(int nr)
1583 return offsetof(struct btrfs_leaf, items) +
1584 sizeof(struct btrfs_item) * nr;
1587 static inline struct btrfs_item *btrfs_item_nr(int nr)
1589 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1592 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1593 struct btrfs_item *item)
1595 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1598 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1600 return btrfs_item_end(eb, btrfs_item_nr(nr));
1603 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1605 return btrfs_item_offset(eb, btrfs_item_nr(nr));
1608 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1610 return btrfs_item_size(eb, btrfs_item_nr(nr));
1613 static inline void btrfs_item_key(struct extent_buffer *eb,
1614 struct btrfs_disk_key *disk_key, int nr)
1616 struct btrfs_item *item = btrfs_item_nr(nr);
1617 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1620 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1621 struct btrfs_disk_key *disk_key, int nr)
1623 struct btrfs_item *item = btrfs_item_nr(nr);
1624 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1627 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1630 * struct btrfs_root_ref
1632 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1633 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1634 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1636 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1637 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1638 BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1640 /* struct btrfs_dir_item */
1641 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1642 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1643 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1644 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1646 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
1648 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1649 struct btrfs_dir_item *item,
1650 struct btrfs_disk_key *key)
1652 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1655 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1656 struct btrfs_dir_item *item,
1657 struct btrfs_disk_key *key)
1659 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1662 /* struct btrfs_free_space_header */
1663 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1665 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1667 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1670 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1671 struct btrfs_free_space_header *h,
1672 struct btrfs_disk_key *key)
1674 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1677 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1678 struct btrfs_free_space_header *h,
1679 struct btrfs_disk_key *key)
1681 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1684 /* struct btrfs_disk_key */
1685 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1687 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1688 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1690 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1691 struct btrfs_disk_key *disk)
1693 cpu->offset = le64_to_cpu(disk->offset);
1694 cpu->type = disk->type;
1695 cpu->objectid = le64_to_cpu(disk->objectid);
1698 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1699 struct btrfs_key *cpu)
1701 disk->offset = cpu_to_le64(cpu->offset);
1702 disk->type = cpu->type;
1703 disk->objectid = cpu_to_le64(cpu->objectid);
1706 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1707 struct btrfs_key *key, int nr)
1709 struct btrfs_disk_key disk_key;
1710 btrfs_node_key(eb, &disk_key, nr);
1711 btrfs_disk_key_to_cpu(key, &disk_key);
1714 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1715 struct btrfs_key *key, int nr)
1717 struct btrfs_disk_key disk_key;
1718 btrfs_item_key(eb, &disk_key, nr);
1719 btrfs_disk_key_to_cpu(key, &disk_key);
1722 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1723 struct btrfs_dir_item *item,
1724 struct btrfs_key *key)
1726 struct btrfs_disk_key disk_key;
1727 btrfs_dir_item_key(eb, item, &disk_key);
1728 btrfs_disk_key_to_cpu(key, &disk_key);
1732 static inline u8 btrfs_key_type(struct btrfs_key *key)
1737 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1742 /* struct btrfs_header */
1743 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1744 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1746 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1747 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1748 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1749 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1750 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
1751 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
1753 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
1754 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
1757 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1759 return (btrfs_header_flags(eb) & flag) == flag;
1762 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1764 u64 flags = btrfs_header_flags(eb);
1765 btrfs_set_header_flags(eb, flags | flag);
1766 return (flags & flag) == flag;
1769 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1771 u64 flags = btrfs_header_flags(eb);
1772 btrfs_set_header_flags(eb, flags & ~flag);
1773 return (flags & flag) == flag;
1776 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1778 u64 flags = btrfs_header_flags(eb);
1779 return flags >> BTRFS_BACKREF_REV_SHIFT;
1782 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1785 u64 flags = btrfs_header_flags(eb);
1786 flags &= ~BTRFS_BACKREF_REV_MASK;
1787 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1788 btrfs_set_header_flags(eb, flags);
1791 static inline unsigned long btrfs_header_fsid(void)
1793 return offsetof(struct btrfs_header, fsid);
1796 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1798 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1802 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1804 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1808 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1810 unsigned long ptr = offsetof(struct btrfs_header, csum);
1814 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1819 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1824 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1829 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1831 return (btrfs_header_level(eb) == 0);
1834 /* struct btrfs_root_item */
1835 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1837 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1838 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1839 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1841 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1843 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1844 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1845 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1846 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1847 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1848 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1849 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1850 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1852 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
1854 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
1856 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
1858 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
1860 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
1863 /* struct btrfs_root_backup */
1864 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
1866 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
1868 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
1869 tree_root_level, 8);
1871 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
1873 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
1874 chunk_root_gen, 64);
1875 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
1876 chunk_root_level, 8);
1878 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
1880 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
1881 extent_root_gen, 64);
1882 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
1883 extent_root_level, 8);
1885 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
1887 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
1889 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
1892 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
1894 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
1896 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
1899 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
1901 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
1903 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
1904 csum_root_level, 8);
1905 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
1907 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
1909 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
1912 /* struct btrfs_super_block */
1914 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1915 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1916 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1918 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1919 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1920 struct btrfs_super_block, sys_chunk_array_size, 32);
1921 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1922 struct btrfs_super_block, chunk_root_generation, 64);
1923 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1925 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1927 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1928 chunk_root_level, 8);
1929 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1931 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1932 log_root_transid, 64);
1933 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1935 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1937 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1939 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1941 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1943 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1945 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1947 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1948 root_dir_objectid, 64);
1949 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1951 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1953 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1954 compat_ro_flags, 64);
1955 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1956 incompat_flags, 64);
1957 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1959 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
1960 cache_generation, 64);
1961 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
1962 uuid_tree_generation, 64);
1963 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
1965 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1967 int t = btrfs_super_csum_type(s);
1968 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1969 return btrfs_csum_sizes[t];
1972 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1974 return offsetof(struct btrfs_leaf, items);
1977 /* struct btrfs_file_extent_item */
1978 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1979 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
1981 static inline unsigned long btrfs_file_extent_inline_start(struct
1982 btrfs_file_extent_item *e)
1984 unsigned long offset = (unsigned long)e;
1985 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1989 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1991 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1994 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1996 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
1998 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2000 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
2002 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2003 disk_num_bytes, 64);
2004 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2006 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
2008 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2010 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
2012 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2014 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
2016 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2018 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
2020 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2022 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2023 other_encoding, 16);
2025 /* btrfs_qgroup_status_item */
2026 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2028 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2030 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2032 BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
2035 /* btrfs_qgroup_info_item */
2036 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2038 BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
2040 BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
2041 struct btrfs_qgroup_info_item, referenced_compressed, 64);
2042 BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
2044 BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
2045 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2047 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2048 struct btrfs_qgroup_info_item, generation, 64);
2049 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
2050 struct btrfs_qgroup_info_item, referenced, 64);
2051 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
2052 struct btrfs_qgroup_info_item, referenced_compressed, 64);
2053 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
2054 struct btrfs_qgroup_info_item, exclusive, 64);
2055 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
2056 struct btrfs_qgroup_info_item, exclusive_compressed, 64);
2058 /* btrfs_qgroup_limit_item */
2059 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2061 BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
2062 max_referenced, 64);
2063 BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
2065 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
2066 rsv_referenced, 64);
2067 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
2070 /* this returns the number of file bytes represented by the inline item.
2071 * If an item is compressed, this is the uncompressed size
2073 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2074 struct btrfs_file_extent_item *e)
2076 return btrfs_file_extent_ram_bytes(eb, e);
2080 * this returns the number of bytes used by the item on disk, minus the
2081 * size of any extent headers. If a file is compressed on disk, this is
2082 * the compressed size
2084 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2085 struct btrfs_item *e)
2087 unsigned long offset;
2088 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2089 return btrfs_item_size(eb, e) - offset;
2092 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
2094 return root->leafsize;
2095 return root->nodesize;
2098 static inline int btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
2100 struct btrfs_super_block *disk_super;
2101 disk_super = fs_info->super_copy;
2102 return !!(btrfs_super_incompat_flags(disk_super) & flag);
2105 /* helper function to cast into the data area of the leaf. */
2106 #define btrfs_item_ptr(leaf, slot, type) \
2107 ((type *)(btrfs_leaf_data(leaf) + \
2108 btrfs_item_offset_nr(leaf, slot)))
2110 #define btrfs_item_ptr_offset(leaf, slot) \
2111 ((unsigned long)(btrfs_leaf_data(leaf) + \
2112 btrfs_item_offset_nr(leaf, slot)))
2115 int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
2116 struct btrfs_root *root);
2117 void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
2118 void btrfs_unpin_extent(struct btrfs_fs_info *fs_info,
2119 u64 bytenr, u64 num_bytes);
2120 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
2121 struct btrfs_root *root);
2122 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
2123 btrfs_fs_info *info,
2125 struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct
2126 btrfs_fs_info *info,
2128 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2129 struct btrfs_root *root,
2130 u32 blocksize, u64 root_objectid,
2131 struct btrfs_disk_key *key, int level,
2132 u64 hint, u64 empty_size);
2133 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
2134 struct btrfs_root *root,
2135 u64 num_bytes, u64 parent,
2136 u64 root_objectid, u64 ref_generation,
2137 u64 owner, u64 empty_size, u64 hint_byte,
2138 u64 search_end, struct btrfs_key *ins, int data);
2139 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2140 struct btrfs_root *root, u64 bytenr,
2141 u64 offset, int metadata, u64 *refs, u64 *flags);
2142 int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
2143 struct btrfs_root *root,
2144 u64 bytenr, int level, u64 flags);
2145 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2146 struct extent_buffer *buf, int record_parent);
2147 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2148 struct extent_buffer *buf, int record_parent);
2149 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2150 struct btrfs_root *root,
2151 u64 bytenr, u64 num_bytes, u64 parent,
2152 u64 root_objectid, u64 owner, u64 offset);
2153 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2154 struct btrfs_root *root,
2155 struct extent_io_tree *unpin);
2156 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2157 struct btrfs_root *root,
2158 u64 bytenr, u64 num_bytes, u64 parent,
2159 u64 root_objectid, u64 ref_generation,
2160 u64 owner_objectid);
2161 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
2162 struct btrfs_root *root, u64 bytenr,
2163 u64 orig_parent, u64 parent,
2164 u64 root_objectid, u64 ref_generation,
2165 u64 owner_objectid);
2166 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2167 struct btrfs_root *root);
2168 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2169 int btrfs_read_block_groups(struct btrfs_root *root);
2170 struct btrfs_block_group_cache *
2171 btrfs_add_block_group(struct btrfs_fs_info *fs_info, u64 bytes_used, u64 type,
2172 u64 chunk_objectid, u64 chunk_offset, u64 size);
2173 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2174 struct btrfs_root *root, u64 bytes_used,
2175 u64 type, u64 chunk_objectid, u64 chunk_offset,
2177 int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
2178 struct btrfs_root *root);
2179 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
2180 struct btrfs_root *root, u64 bytenr, u64 num,
2181 int alloc, int mark_free);
2183 int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2184 struct btrfs_path *path, int level, int slot);
2185 int btrfs_check_node(struct btrfs_root *root,
2186 struct btrfs_disk_key *parent_key,
2187 struct extent_buffer *buf);
2188 int btrfs_check_leaf(struct btrfs_root *root,
2189 struct btrfs_disk_key *parent_key,
2190 struct extent_buffer *buf);
2191 void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
2192 int level, int slot, u64 objectid);
2193 struct extent_buffer *read_node_slot(struct btrfs_root *root,
2194 struct extent_buffer *parent, int slot);
2195 int btrfs_previous_item(struct btrfs_root *root,
2196 struct btrfs_path *path, u64 min_objectid,
2198 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2199 struct btrfs_root *root, struct extent_buffer *buf,
2200 struct extent_buffer *parent, int parent_slot,
2201 struct extent_buffer **cow_ret);
2202 int __btrfs_cow_block(struct btrfs_trans_handle *trans,
2203 struct btrfs_root *root,
2204 struct extent_buffer *buf,
2205 struct extent_buffer *parent, int parent_slot,
2206 struct extent_buffer **cow_ret,
2207 u64 search_start, u64 empty_size);
2208 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2209 struct btrfs_root *root,
2210 struct extent_buffer *buf,
2211 struct extent_buffer **cow_ret, u64 new_root_objectid);
2212 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2213 *root, struct btrfs_path *path, u32 data_size);
2214 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2215 struct btrfs_root *root,
2216 struct btrfs_path *path,
2217 u32 new_size, int from_end);
2218 int btrfs_split_item(struct btrfs_trans_handle *trans,
2219 struct btrfs_root *root,
2220 struct btrfs_path *path,
2221 struct btrfs_key *new_key,
2222 unsigned long split_offset);
2223 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2224 *root, struct btrfs_key *key, struct btrfs_path *p, int
2226 void btrfs_release_path(struct btrfs_path *p);
2227 void add_root_to_dirty_list(struct btrfs_root *root);
2228 struct btrfs_path *btrfs_alloc_path(void);
2229 void btrfs_free_path(struct btrfs_path *p);
2230 void btrfs_init_path(struct btrfs_path *p);
2231 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2232 struct btrfs_path *path, int slot, int nr);
2234 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2235 struct btrfs_root *root,
2236 struct btrfs_path *path)
2238 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2241 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2242 *root, struct btrfs_key *key, void *data, u32 data_size);
2243 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2244 struct btrfs_root *root,
2245 struct btrfs_path *path,
2246 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2248 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2249 struct btrfs_root *root,
2250 struct btrfs_path *path,
2251 struct btrfs_key *key,
2254 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2257 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2258 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2259 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2260 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2261 struct btrfs_root *root, struct btrfs_path *path,
2262 struct btrfs_key *new_key);
2265 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2266 struct btrfs_root *tree_root,
2267 u64 root_id, u8 type, u64 ref_id,
2268 u64 dirid, u64 sequence,
2269 const char *name, int name_len);
2270 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2271 *root, struct btrfs_key *key, struct btrfs_root_item
2273 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2274 *root, struct btrfs_key *key, struct btrfs_root_item
2276 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2277 btrfs_root_item *item, struct btrfs_key *key);
2279 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
2280 *root, const char *name, int name_len, u64 dir,
2281 struct btrfs_key *location, u8 type, u64 index);
2282 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2283 struct btrfs_root *root,
2284 struct btrfs_path *path, u64 dir,
2285 const char *name, int name_len,
2287 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2288 struct btrfs_root *root, const char *name,
2289 u16 name_len, const void *data, u16 data_len,
2292 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2293 struct btrfs_root *fs_root,
2294 u64 dirid, u64 *objectid);
2297 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2298 struct btrfs_root *root,
2299 const char *name, int name_len,
2300 u64 inode_objectid, u64 ref_objectid, u64 index);
2301 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2302 *root, u64 objectid, struct btrfs_inode_item
2304 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2305 *root, struct btrfs_path *path,
2306 struct btrfs_key *location, int mod);
2309 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2310 struct btrfs_root *root, u64 bytenr, u64 len);
2311 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2312 struct btrfs_root *root,
2313 u64 objectid, u64 pos, u64 offset,
2316 int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
2317 struct btrfs_root *root, u64 objectid,
2318 u64 offset, char *buffer, size_t size);
2319 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
2320 struct btrfs_root *root, u64 alloc_end,
2321 u64 bytenr, char *data, size_t len);
2322 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2323 struct btrfs_root *root, struct btrfs_path *path,
2327 int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id);
2328 int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,