1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _BTRFS_CTREE_H_
3 #define _BTRFS_CTREE_H_
5 #include <linux/btrfs.h>
6 #include <linux/types.h>
9 * This header contains the structure definitions and constants used
10 * by file system objects that can be retrieved using
11 * the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that
12 * is needed to describe a leaf node's key or item contents.
15 /* holds pointers to all of the tree roots */
16 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
18 /* stores information about which extents are in use, and reference counts */
19 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
22 * chunk tree stores translations from logical -> physical block numbering
23 * the super block points to the chunk tree
25 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
28 * stores information about which areas of a given device are in use.
29 * one per device. The tree of tree roots points to the device tree
31 #define BTRFS_DEV_TREE_OBJECTID 4ULL
33 /* one per subvolume, storing files and directories */
34 #define BTRFS_FS_TREE_OBJECTID 5ULL
36 /* directory objectid inside the root tree */
37 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
39 /* holds checksums of all the data extents */
40 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
42 /* holds quota configuration and tracking */
43 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
45 /* for storing items that use the BTRFS_UUID_KEY* types */
46 #define BTRFS_UUID_TREE_OBJECTID 9ULL
48 /* tracks free space in block groups. */
49 #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
51 /* device stats in the device tree */
52 #define BTRFS_DEV_STATS_OBJECTID 0ULL
54 /* for storing balance parameters in the root tree */
55 #define BTRFS_BALANCE_OBJECTID -4ULL
57 /* orhpan objectid for tracking unlinked/truncated files */
58 #define BTRFS_ORPHAN_OBJECTID -5ULL
60 /* does write ahead logging to speed up fsyncs */
61 #define BTRFS_TREE_LOG_OBJECTID -6ULL
62 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
64 /* for space balancing */
65 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
66 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
69 * extent checksums all have this objectid
70 * this allows them to share the logging tree
73 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
75 /* For storing free space cache */
76 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
79 * The inode number assigned to the special inode for storing
82 #define BTRFS_FREE_INO_OBJECTID -12ULL
84 /* dummy objectid represents multiple objectids */
85 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
88 * All files have objectids in this range.
90 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
91 #define BTRFS_LAST_FREE_OBJECTID -256ULL
92 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
96 * the device items go into the chunk tree. The key is in the form
97 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
99 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
101 #define BTRFS_BTREE_INODE_OBJECTID 1
103 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
105 #define BTRFS_DEV_REPLACE_DEVID 0ULL
108 * inode items have the data typically returned from stat and store other
109 * info about object characteristics. There is one for every file and dir in
112 #define BTRFS_INODE_ITEM_KEY 1
113 #define BTRFS_INODE_REF_KEY 12
114 #define BTRFS_INODE_EXTREF_KEY 13
115 #define BTRFS_XATTR_ITEM_KEY 24
116 #define BTRFS_ORPHAN_ITEM_KEY 48
117 /* reserve 2-15 close to the inode for later flexibility */
120 * dir items are the name -> inode pointers in a directory. There is one
121 * for every name in a directory.
123 #define BTRFS_DIR_LOG_ITEM_KEY 60
124 #define BTRFS_DIR_LOG_INDEX_KEY 72
125 #define BTRFS_DIR_ITEM_KEY 84
126 #define BTRFS_DIR_INDEX_KEY 96
128 * extent data is for file data
130 #define BTRFS_EXTENT_DATA_KEY 108
133 * extent csums are stored in a separate tree and hold csums for
134 * an entire extent on disk.
136 #define BTRFS_EXTENT_CSUM_KEY 128
139 * root items point to tree roots. They are typically in the root
140 * tree used by the super block to find all the other trees
142 #define BTRFS_ROOT_ITEM_KEY 132
145 * root backrefs tie subvols and snapshots to the directory entries that
148 #define BTRFS_ROOT_BACKREF_KEY 144
151 * root refs make a fast index for listing all of the snapshots and
152 * subvolumes referenced by a given root. They point directly to the
153 * directory item in the root that references the subvol
155 #define BTRFS_ROOT_REF_KEY 156
158 * extent items are in the extent map tree. These record which blocks
159 * are used, and how many references there are to each block
161 #define BTRFS_EXTENT_ITEM_KEY 168
164 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
165 * the length, so we save the level in key->offset instead of the length.
167 #define BTRFS_METADATA_ITEM_KEY 169
169 #define BTRFS_TREE_BLOCK_REF_KEY 176
171 #define BTRFS_EXTENT_DATA_REF_KEY 178
173 #define BTRFS_EXTENT_REF_V0_KEY 180
175 #define BTRFS_SHARED_BLOCK_REF_KEY 182
177 #define BTRFS_SHARED_DATA_REF_KEY 184
180 * block groups give us hints into the extent allocation trees. Which
181 * blocks are free etc etc
183 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
186 * Every block group is represented in the free space tree by a free space info
187 * item, which stores some accounting information. It is keyed on
188 * (block_group_start, FREE_SPACE_INFO, block_group_length).
190 #define BTRFS_FREE_SPACE_INFO_KEY 198
193 * A free space extent tracks an extent of space that is free in a block group.
194 * It is keyed on (start, FREE_SPACE_EXTENT, length).
196 #define BTRFS_FREE_SPACE_EXTENT_KEY 199
199 * When a block group becomes very fragmented, we convert it to use bitmaps
200 * instead of extents. A free space bitmap is keyed on
201 * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
202 * (length / sectorsize) bits.
204 #define BTRFS_FREE_SPACE_BITMAP_KEY 200
206 #define BTRFS_DEV_EXTENT_KEY 204
207 #define BTRFS_DEV_ITEM_KEY 216
208 #define BTRFS_CHUNK_ITEM_KEY 228
211 * Records the overall state of the qgroups.
212 * There's only one instance of this key present,
213 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
215 #define BTRFS_QGROUP_STATUS_KEY 240
217 * Records the currently used space of the qgroup.
218 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
220 #define BTRFS_QGROUP_INFO_KEY 242
222 * Contains the user configured limits for the qgroup.
223 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
225 #define BTRFS_QGROUP_LIMIT_KEY 244
227 * Records the child-parent relationship of qgroups. For
228 * each relation, 2 keys are present:
229 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
230 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
232 #define BTRFS_QGROUP_RELATION_KEY 246
235 * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
237 #define BTRFS_BALANCE_ITEM_KEY 248
240 * The key type for tree items that are stored persistently, but do not need to
241 * exist for extended period of time. The items can exist in any tree.
243 * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
247 * - balance status item
248 * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
250 #define BTRFS_TEMPORARY_ITEM_KEY 248
253 * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
255 #define BTRFS_DEV_STATS_KEY 249
258 * The key type for tree items that are stored persistently and usually exist
259 * for a long period, eg. filesystem lifetime. The item kinds can be status
260 * information, stats or preference values. The item can exist in any tree.
262 * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
266 * - device statistics, store IO stats in the device tree, one key for all
268 * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
270 #define BTRFS_PERSISTENT_ITEM_KEY 249
273 * Persistantly stores the device replace state in the device tree.
274 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
276 #define BTRFS_DEV_REPLACE_KEY 250
279 * Stores items that allow to quickly map UUIDs to something else.
280 * These items are part of the filesystem UUID tree.
281 * The key is built like this:
282 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
284 #if BTRFS_UUID_SIZE != 16
285 #error "UUID items require BTRFS_UUID_SIZE == 16!"
287 #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
288 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
289 * received subvols */
292 * string items are for debugging. They just store a short string of
295 #define BTRFS_STRING_ITEM_KEY 253
299 /* 32 bytes in various csum fields */
300 #define BTRFS_CSUM_SIZE 32
303 #define BTRFS_CSUM_TYPE_CRC32 0
306 * flags definitions for directory entry item type
309 * struct btrfs_dir_item.type
311 * Values 0..7 must match common file type values in fs_types.h.
313 #define BTRFS_FT_UNKNOWN 0
314 #define BTRFS_FT_REG_FILE 1
315 #define BTRFS_FT_DIR 2
316 #define BTRFS_FT_CHRDEV 3
317 #define BTRFS_FT_BLKDEV 4
318 #define BTRFS_FT_FIFO 5
319 #define BTRFS_FT_SOCK 6
320 #define BTRFS_FT_SYMLINK 7
321 #define BTRFS_FT_XATTR 8
322 #define BTRFS_FT_MAX 9
325 * The key defines the order in the tree, and so it also defines (optimal)
328 * objectid corresponds to the inode number.
330 * type tells us things about the object, and is a kind of stream selector.
331 * so for a given inode, keys with type of 1 might refer to the inode data,
332 * type of 2 may point to file data in the btree and type == 3 may point to
335 * offset is the starting byte offset for this key in the stream.
337 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
338 * in cpu native order. Otherwise they are identical and their sizes
339 * should be the same (ie both packed)
341 struct btrfs_disk_key {
345 } __attribute__ ((__packed__));
351 } __attribute__ ((__packed__));
353 struct btrfs_dev_item {
354 /* the internal btrfs device id */
357 /* size of the device */
363 /* optimal io alignment for this device */
366 /* optimal io width for this device */
369 /* minimal io size for this device */
372 /* type and info about this device */
375 /* expected generation for this device */
379 * starting byte of this partition on the device,
380 * to allow for stripe alignment in the future
384 /* grouping information for allocation decisions */
387 /* seek speed 0-100 where 100 is fastest */
390 /* bandwidth 0-100 where 100 is fastest */
393 /* btrfs generated uuid for this device */
394 __u8 uuid[BTRFS_UUID_SIZE];
396 /* uuid of FS who owns this device */
397 __u8 fsid[BTRFS_UUID_SIZE];
398 } __attribute__ ((__packed__));
400 struct btrfs_stripe {
403 __u8 dev_uuid[BTRFS_UUID_SIZE];
404 } __attribute__ ((__packed__));
407 /* size of this chunk in bytes */
410 /* objectid of the root referencing this chunk */
416 /* optimal io alignment for this chunk */
419 /* optimal io width for this chunk */
422 /* minimal io size for this chunk */
425 /* 2^16 stripes is quite a lot, a second limit is the size of a single
430 /* sub stripes only matter for raid10 */
432 struct btrfs_stripe stripe;
433 /* additional stripes go here */
434 } __attribute__ ((__packed__));
436 #define BTRFS_FREE_SPACE_EXTENT 1
437 #define BTRFS_FREE_SPACE_BITMAP 2
439 struct btrfs_free_space_entry {
443 } __attribute__ ((__packed__));
445 struct btrfs_free_space_header {
446 struct btrfs_disk_key location;
450 } __attribute__ ((__packed__));
452 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
453 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
455 /* Super block flags */
456 /* Errors detected */
457 #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
459 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
460 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
461 #define BTRFS_SUPER_FLAG_METADUMP_V2 (1ULL << 34)
462 #define BTRFS_SUPER_FLAG_CHANGING_FSID (1ULL << 35)
463 #define BTRFS_SUPER_FLAG_CHANGING_FSID_V2 (1ULL << 36)
467 * items in the extent btree are used to record the objectid of the
468 * owner of the block and the number of references
471 struct btrfs_extent_item {
475 } __attribute__ ((__packed__));
477 struct btrfs_extent_item_v0 {
479 } __attribute__ ((__packed__));
482 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
483 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
485 /* following flags only apply to tree blocks */
487 /* use full backrefs for extent pointers in the block */
488 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
491 * this flag is only used internally by scrub and may be changed at any time
492 * it is only declared here to avoid collisions
494 #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
496 struct btrfs_tree_block_info {
497 struct btrfs_disk_key key;
499 } __attribute__ ((__packed__));
501 struct btrfs_extent_data_ref {
506 } __attribute__ ((__packed__));
508 struct btrfs_shared_data_ref {
510 } __attribute__ ((__packed__));
512 struct btrfs_extent_inline_ref {
515 } __attribute__ ((__packed__));
517 /* old style backrefs item */
518 struct btrfs_extent_ref_v0 {
523 } __attribute__ ((__packed__));
526 /* dev extents record free space on individual devices. The owner
527 * field points back to the chunk allocation mapping tree that allocated
528 * the extent. The chunk tree uuid field is a way to double check the owner
530 struct btrfs_dev_extent {
532 __le64 chunk_objectid;
535 __u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
536 } __attribute__ ((__packed__));
538 struct btrfs_inode_ref {
542 } __attribute__ ((__packed__));
544 struct btrfs_inode_extref {
545 __le64 parent_objectid;
550 } __attribute__ ((__packed__));
552 struct btrfs_timespec {
555 } __attribute__ ((__packed__));
557 struct btrfs_inode_item {
558 /* nfs style generation number */
560 /* transid that last touched this inode */
572 /* modification sequence number for NFS */
576 * a little future expansion, for more than this we can
577 * just grow the inode item and version it
580 struct btrfs_timespec atime;
581 struct btrfs_timespec ctime;
582 struct btrfs_timespec mtime;
583 struct btrfs_timespec otime;
584 } __attribute__ ((__packed__));
586 struct btrfs_dir_log_item {
588 } __attribute__ ((__packed__));
590 struct btrfs_dir_item {
591 struct btrfs_disk_key location;
596 } __attribute__ ((__packed__));
598 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
601 * Internal in-memory flag that a subvolume has been marked for deletion but
602 * still visible as a directory
604 #define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
606 struct btrfs_root_item {
607 struct btrfs_inode_item inode;
613 __le64 last_snapshot;
616 struct btrfs_disk_key drop_progress;
621 * The following fields appear after subvol_uuids+subvol_times
626 * This generation number is used to test if the new fields are valid
627 * and up to date while reading the root item. Every time the root item
628 * is written out, the "generation" field is copied into this field. If
629 * anyone ever mounted the fs with an older kernel, we will have
630 * mismatching generation values here and thus must invalidate the
631 * new fields. See btrfs_update_root and btrfs_find_last_root for
633 * the offset of generation_v2 is also used as the start for the memset
634 * when invalidating the fields.
636 __le64 generation_v2;
637 __u8 uuid[BTRFS_UUID_SIZE];
638 __u8 parent_uuid[BTRFS_UUID_SIZE];
639 __u8 received_uuid[BTRFS_UUID_SIZE];
640 __le64 ctransid; /* updated when an inode changes */
641 __le64 otransid; /* trans when created */
642 __le64 stransid; /* trans when sent. non-zero for received subvol */
643 __le64 rtransid; /* trans when received. non-zero for received subvol */
644 struct btrfs_timespec ctime;
645 struct btrfs_timespec otime;
646 struct btrfs_timespec stime;
647 struct btrfs_timespec rtime;
648 __le64 reserved[8]; /* for future */
649 } __attribute__ ((__packed__));
652 * this is used for both forward and backward root refs
654 struct btrfs_root_ref {
658 } __attribute__ ((__packed__));
660 struct btrfs_disk_balance_args {
662 * profiles to operate on, single is denoted by
663 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
669 * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
670 * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
683 /* devid subset filter [pstart..pend) */
687 /* btrfs virtual address space subset filter [vstart..vend) */
692 * profile to convert to, single is denoted by
693 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
697 /* BTRFS_BALANCE_ARGS_* */
701 * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
702 * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
714 * Process chunks that cross stripes_min..stripes_max devices,
715 * BTRFS_BALANCE_ARGS_STRIPES_RANGE
721 } __attribute__ ((__packed__));
724 * store balance parameters to disk so that balance can be properly
725 * resumed after crash or unmount
727 struct btrfs_balance_item {
728 /* BTRFS_BALANCE_* */
731 struct btrfs_disk_balance_args data;
732 struct btrfs_disk_balance_args meta;
733 struct btrfs_disk_balance_args sys;
736 } __attribute__ ((__packed__));
738 #define BTRFS_FILE_EXTENT_INLINE 0
739 #define BTRFS_FILE_EXTENT_REG 1
740 #define BTRFS_FILE_EXTENT_PREALLOC 2
741 #define BTRFS_FILE_EXTENT_TYPES 2
743 struct btrfs_file_extent_item {
745 * transaction id that created this extent
749 * max number of bytes to hold this extent in ram
750 * when we split a compressed extent we can't know how big
751 * each of the resulting pieces will be. So, this is
752 * an upper limit on the size of the extent in ram instead of
758 * 32 bits for the various ways we might encode the data,
759 * including compression and encryption. If any of these
760 * are set to something a given disk format doesn't understand
761 * it is treated like an incompat flag for reading and writing,
766 __le16 other_encoding; /* spare for later use */
768 /* are we inline data or a real extent? */
772 * disk space consumed by the extent, checksum blocks are included
775 * At this offset in the structure, the inline extent data start.
778 __le64 disk_num_bytes;
780 * the logical offset in file blocks (no csums)
781 * this extent record is for. This allows a file extent to point
782 * into the middle of an existing extent on disk, sharing it
783 * between two snapshots (useful if some bytes in the middle of the
784 * extent have changed
788 * the logical number of file blocks (no csums included). This
789 * always reflects the size uncompressed and without encoding.
793 } __attribute__ ((__packed__));
795 struct btrfs_csum_item {
797 } __attribute__ ((__packed__));
799 struct btrfs_dev_stats_item {
801 * grow this item struct at the end for future enhancements and keep
802 * the existing values unchanged
804 __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
805 } __attribute__ ((__packed__));
807 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
808 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
809 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0
810 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1
811 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2
812 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3
813 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4
815 struct btrfs_dev_replace_item {
817 * grow this item struct at the end for future enhancements and keep
818 * the existing values unchanged
823 __le64 cont_reading_from_srcdev_mode;
825 __le64 replace_state;
828 __le64 num_write_errors;
829 __le64 num_uncorrectable_read_errors;
830 } __attribute__ ((__packed__));
832 /* different types of block groups (and chunks) */
833 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
834 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
835 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
836 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
837 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
838 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
839 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
840 #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
841 #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
842 #define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
843 BTRFS_SPACE_INFO_GLOBAL_RSV)
845 enum btrfs_raid_types {
856 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
857 BTRFS_BLOCK_GROUP_SYSTEM | \
858 BTRFS_BLOCK_GROUP_METADATA)
860 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
861 BTRFS_BLOCK_GROUP_RAID1 | \
862 BTRFS_BLOCK_GROUP_RAID5 | \
863 BTRFS_BLOCK_GROUP_RAID6 | \
864 BTRFS_BLOCK_GROUP_DUP | \
865 BTRFS_BLOCK_GROUP_RAID10)
866 #define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \
867 BTRFS_BLOCK_GROUP_RAID6)
870 * We need a bit for restriper to be able to tell when chunks of type
871 * SINGLE are available. This "extended" profile format is used in
872 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
873 * (on-disk). The corresponding on-disk bit in chunk.type is reserved
874 * to avoid remappings between two formats in future.
876 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
879 * A fake block group type that is used to communicate global block reserve
880 * size to userspace via the SPACE_INFO ioctl.
882 #define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
884 #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
885 BTRFS_AVAIL_ALLOC_BIT_SINGLE)
887 static inline __u64 chunk_to_extended(__u64 flags)
889 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
890 flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
894 static inline __u64 extended_to_chunk(__u64 flags)
896 return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
899 struct btrfs_block_group_item {
901 __le64 chunk_objectid;
903 } __attribute__ ((__packed__));
905 struct btrfs_free_space_info {
908 } __attribute__ ((__packed__));
910 #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
912 #define BTRFS_QGROUP_LEVEL_SHIFT 48
913 static inline __u64 btrfs_qgroup_level(__u64 qgroupid)
915 return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
919 * is subvolume quota turned on?
921 #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
923 * RESCAN is set during the initialization phase
925 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1)
927 * Some qgroup entries are known to be out of date,
928 * either because the configuration has changed in a way that
929 * makes a rescan necessary, or because the fs has been mounted
930 * with a non-qgroup-aware version.
931 * Turning qouta off and on again makes it inconsistent, too.
933 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
935 #define BTRFS_QGROUP_STATUS_VERSION 1
937 struct btrfs_qgroup_status_item {
940 * the generation is updated during every commit. As older
941 * versions of btrfs are not aware of qgroups, it will be
942 * possible to detect inconsistencies by checking the
943 * generation on mount time
947 /* flag definitions see above */
951 * only used during scanning to record the progress
952 * of the scan. It contains a logical address
955 } __attribute__ ((__packed__));
957 struct btrfs_qgroup_info_item {
963 } __attribute__ ((__packed__));
965 struct btrfs_qgroup_limit_item {
967 * only updated when any of the other values change
974 } __attribute__ ((__packed__));
976 #endif /* _BTRFS_CTREE_H_ */