1 #ifndef _BTRFS_CTREE_H_
2 #define _BTRFS_CTREE_H_
4 #include <linux/btrfs.h>
5 #include <linux/types.h>
8 * This header contains the structure definitions and constants used
9 * by file system objects that can be retrieved using
10 * the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that
11 * is needed to describe a leaf node's key or item contents.
14 /* holds pointers to all of the tree roots */
15 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
17 /* stores information about which extents are in use, and reference counts */
18 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
21 * chunk tree stores translations from logical -> physical block numbering
22 * the super block points to the chunk tree
24 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
27 * stores information about which areas of a given device are in use.
28 * one per device. The tree of tree roots points to the device tree
30 #define BTRFS_DEV_TREE_OBJECTID 4ULL
32 /* one per subvolume, storing files and directories */
33 #define BTRFS_FS_TREE_OBJECTID 5ULL
35 /* directory objectid inside the root tree */
36 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
38 /* holds checksums of all the data extents */
39 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
41 /* holds quota configuration and tracking */
42 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
44 /* for storing items that use the BTRFS_UUID_KEY* types */
45 #define BTRFS_UUID_TREE_OBJECTID 9ULL
47 /* tracks free space in block groups. */
48 #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
50 /* device stats in the device tree */
51 #define BTRFS_DEV_STATS_OBJECTID 0ULL
53 /* for storing balance parameters in the root tree */
54 #define BTRFS_BALANCE_OBJECTID -4ULL
56 /* orhpan objectid for tracking unlinked/truncated files */
57 #define BTRFS_ORPHAN_OBJECTID -5ULL
59 /* does write ahead logging to speed up fsyncs */
60 #define BTRFS_TREE_LOG_OBJECTID -6ULL
61 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
63 /* for space balancing */
64 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
65 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
68 * extent checksums all have this objectid
69 * this allows them to share the logging tree
72 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
74 /* For storing free space cache */
75 #define BTRFS_FREE_SPACE_OBJECTID -11ULL
78 * The inode number assigned to the special inode for storing
81 #define BTRFS_FREE_INO_OBJECTID -12ULL
83 /* dummy objectid represents multiple objectids */
84 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
87 * All files have objectids in this range.
89 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
90 #define BTRFS_LAST_FREE_OBJECTID -256ULL
91 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
95 * the device items go into the chunk tree. The key is in the form
96 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
98 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
100 #define BTRFS_BTREE_INODE_OBJECTID 1
102 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
104 #define BTRFS_DEV_REPLACE_DEVID 0ULL
107 * inode items have the data typically returned from stat and store other
108 * info about object characteristics. There is one for every file and dir in
111 #define BTRFS_INODE_ITEM_KEY 1
112 #define BTRFS_INODE_REF_KEY 12
113 #define BTRFS_INODE_EXTREF_KEY 13
114 #define BTRFS_XATTR_ITEM_KEY 24
115 #define BTRFS_ORPHAN_ITEM_KEY 48
116 /* reserve 2-15 close to the inode for later flexibility */
119 * dir items are the name -> inode pointers in a directory. There is one
120 * for every name in a directory.
122 #define BTRFS_DIR_LOG_ITEM_KEY 60
123 #define BTRFS_DIR_LOG_INDEX_KEY 72
124 #define BTRFS_DIR_ITEM_KEY 84
125 #define BTRFS_DIR_INDEX_KEY 96
127 * extent data is for file data
129 #define BTRFS_EXTENT_DATA_KEY 108
132 * extent csums are stored in a separate tree and hold csums for
133 * an entire extent on disk.
135 #define BTRFS_EXTENT_CSUM_KEY 128
138 * root items point to tree roots. They are typically in the root
139 * tree used by the super block to find all the other trees
141 #define BTRFS_ROOT_ITEM_KEY 132
144 * root backrefs tie subvols and snapshots to the directory entries that
147 #define BTRFS_ROOT_BACKREF_KEY 144
150 * root refs make a fast index for listing all of the snapshots and
151 * subvolumes referenced by a given root. They point directly to the
152 * directory item in the root that references the subvol
154 #define BTRFS_ROOT_REF_KEY 156
157 * extent items are in the extent map tree. These record which blocks
158 * are used, and how many references there are to each block
160 #define BTRFS_EXTENT_ITEM_KEY 168
163 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
164 * the length, so we save the level in key->offset instead of the length.
166 #define BTRFS_METADATA_ITEM_KEY 169
168 #define BTRFS_TREE_BLOCK_REF_KEY 176
170 #define BTRFS_EXTENT_DATA_REF_KEY 178
172 #define BTRFS_EXTENT_REF_V0_KEY 180
174 #define BTRFS_SHARED_BLOCK_REF_KEY 182
176 #define BTRFS_SHARED_DATA_REF_KEY 184
179 * block groups give us hints into the extent allocation trees. Which
180 * blocks are free etc etc
182 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
185 * Every block group is represented in the free space tree by a free space info
186 * item, which stores some accounting information. It is keyed on
187 * (block_group_start, FREE_SPACE_INFO, block_group_length).
189 #define BTRFS_FREE_SPACE_INFO_KEY 198
192 * A free space extent tracks an extent of space that is free in a block group.
193 * It is keyed on (start, FREE_SPACE_EXTENT, length).
195 #define BTRFS_FREE_SPACE_EXTENT_KEY 199
198 * When a block group becomes very fragmented, we convert it to use bitmaps
199 * instead of extents. A free space bitmap is keyed on
200 * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
201 * (length / sectorsize) bits.
203 #define BTRFS_FREE_SPACE_BITMAP_KEY 200
205 #define BTRFS_DEV_EXTENT_KEY 204
206 #define BTRFS_DEV_ITEM_KEY 216
207 #define BTRFS_CHUNK_ITEM_KEY 228
210 * Records the overall state of the qgroups.
211 * There's only one instance of this key present,
212 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
214 #define BTRFS_QGROUP_STATUS_KEY 240
216 * Records the currently used space of the qgroup.
217 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
219 #define BTRFS_QGROUP_INFO_KEY 242
221 * Contains the user configured limits for the qgroup.
222 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
224 #define BTRFS_QGROUP_LIMIT_KEY 244
226 * Records the child-parent relationship of qgroups. For
227 * each relation, 2 keys are present:
228 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
229 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
231 #define BTRFS_QGROUP_RELATION_KEY 246
234 * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
236 #define BTRFS_BALANCE_ITEM_KEY 248
239 * The key type for tree items that are stored persistently, but do not need to
240 * exist for extended period of time. The items can exist in any tree.
242 * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
246 * - balance status item
247 * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
249 #define BTRFS_TEMPORARY_ITEM_KEY 248
252 * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
254 #define BTRFS_DEV_STATS_KEY 249
257 * The key type for tree items that are stored persistently and usually exist
258 * for a long period, eg. filesystem lifetime. The item kinds can be status
259 * information, stats or preference values. The item can exist in any tree.
261 * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
265 * - device statistics, store IO stats in the device tree, one key for all
267 * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
269 #define BTRFS_PERSISTENT_ITEM_KEY 249
272 * Persistantly stores the device replace state in the device tree.
273 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
275 #define BTRFS_DEV_REPLACE_KEY 250
278 * Stores items that allow to quickly map UUIDs to something else.
279 * These items are part of the filesystem UUID tree.
280 * The key is built like this:
281 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
283 #if BTRFS_UUID_SIZE != 16
284 #error "UUID items require BTRFS_UUID_SIZE == 16!"
286 #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
287 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
288 * received subvols */
291 * string items are for debugging. They just store a short string of
294 #define BTRFS_STRING_ITEM_KEY 253
298 /* 32 bytes in various csum fields */
299 #define BTRFS_CSUM_SIZE 32
302 #define BTRFS_CSUM_TYPE_CRC32 0
305 * flags definitions for directory entry item type
308 * struct btrfs_dir_item.type
310 #define BTRFS_FT_UNKNOWN 0
311 #define BTRFS_FT_REG_FILE 1
312 #define BTRFS_FT_DIR 2
313 #define BTRFS_FT_CHRDEV 3
314 #define BTRFS_FT_BLKDEV 4
315 #define BTRFS_FT_FIFO 5
316 #define BTRFS_FT_SOCK 6
317 #define BTRFS_FT_SYMLINK 7
318 #define BTRFS_FT_XATTR 8
319 #define BTRFS_FT_MAX 9
322 * The key defines the order in the tree, and so it also defines (optimal)
325 * objectid corresponds to the inode number.
327 * type tells us things about the object, and is a kind of stream selector.
328 * so for a given inode, keys with type of 1 might refer to the inode data,
329 * type of 2 may point to file data in the btree and type == 3 may point to
332 * offset is the starting byte offset for this key in the stream.
334 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
335 * in cpu native order. Otherwise they are identical and their sizes
336 * should be the same (ie both packed)
338 struct btrfs_disk_key
{
342 } __attribute__ ((__packed__
));
348 } __attribute__ ((__packed__
));
350 struct btrfs_dev_item
{
351 /* the internal btrfs device id */
354 /* size of the device */
360 /* optimal io alignment for this device */
363 /* optimal io width for this device */
366 /* minimal io size for this device */
369 /* type and info about this device */
372 /* expected generation for this device */
376 * starting byte of this partition on the device,
377 * to allow for stripe alignment in the future
381 /* grouping information for allocation decisions */
384 /* seek speed 0-100 where 100 is fastest */
387 /* bandwidth 0-100 where 100 is fastest */
390 /* btrfs generated uuid for this device */
391 __u8 uuid
[BTRFS_UUID_SIZE
];
393 /* uuid of FS who owns this device */
394 __u8 fsid
[BTRFS_UUID_SIZE
];
395 } __attribute__ ((__packed__
));
397 struct btrfs_stripe
{
400 __u8 dev_uuid
[BTRFS_UUID_SIZE
];
401 } __attribute__ ((__packed__
));
404 /* size of this chunk in bytes */
407 /* objectid of the root referencing this chunk */
413 /* optimal io alignment for this chunk */
416 /* optimal io width for this chunk */
419 /* minimal io size for this chunk */
422 /* 2^16 stripes is quite a lot, a second limit is the size of a single
427 /* sub stripes only matter for raid10 */
429 struct btrfs_stripe stripe
;
430 /* additional stripes go here */
431 } __attribute__ ((__packed__
));
433 #define BTRFS_FREE_SPACE_EXTENT 1
434 #define BTRFS_FREE_SPACE_BITMAP 2
436 struct btrfs_free_space_entry
{
440 } __attribute__ ((__packed__
));
442 struct btrfs_free_space_header
{
443 struct btrfs_disk_key location
;
447 } __attribute__ ((__packed__
));
449 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
450 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
452 /* Super block flags */
453 /* Errors detected */
454 #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
456 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
457 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
461 * items in the extent btree are used to record the objectid of the
462 * owner of the block and the number of references
465 struct btrfs_extent_item
{
469 } __attribute__ ((__packed__
));
471 struct btrfs_extent_item_v0
{
473 } __attribute__ ((__packed__
));
476 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
477 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
479 /* following flags only apply to tree blocks */
481 /* use full backrefs for extent pointers in the block */
482 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
485 * this flag is only used internally by scrub and may be changed at any time
486 * it is only declared here to avoid collisions
488 #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
490 struct btrfs_tree_block_info
{
491 struct btrfs_disk_key key
;
493 } __attribute__ ((__packed__
));
495 struct btrfs_extent_data_ref
{
500 } __attribute__ ((__packed__
));
502 struct btrfs_shared_data_ref
{
504 } __attribute__ ((__packed__
));
506 struct btrfs_extent_inline_ref
{
509 } __attribute__ ((__packed__
));
511 /* old style backrefs item */
512 struct btrfs_extent_ref_v0
{
517 } __attribute__ ((__packed__
));
520 /* dev extents record free space on individual devices. The owner
521 * field points back to the chunk allocation mapping tree that allocated
522 * the extent. The chunk tree uuid field is a way to double check the owner
524 struct btrfs_dev_extent
{
526 __le64 chunk_objectid
;
529 __u8 chunk_tree_uuid
[BTRFS_UUID_SIZE
];
530 } __attribute__ ((__packed__
));
532 struct btrfs_inode_ref
{
536 } __attribute__ ((__packed__
));
538 struct btrfs_inode_extref
{
539 __le64 parent_objectid
;
544 } __attribute__ ((__packed__
));
546 struct btrfs_timespec
{
549 } __attribute__ ((__packed__
));
551 struct btrfs_inode_item
{
552 /* nfs style generation number */
554 /* transid that last touched this inode */
566 /* modification sequence number for NFS */
570 * a little future expansion, for more than this we can
571 * just grow the inode item and version it
574 struct btrfs_timespec atime
;
575 struct btrfs_timespec ctime
;
576 struct btrfs_timespec mtime
;
577 struct btrfs_timespec otime
;
578 } __attribute__ ((__packed__
));
580 struct btrfs_dir_log_item
{
582 } __attribute__ ((__packed__
));
584 struct btrfs_dir_item
{
585 struct btrfs_disk_key location
;
590 } __attribute__ ((__packed__
));
592 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
595 * Internal in-memory flag that a subvolume has been marked for deletion but
596 * still visible as a directory
598 #define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
600 struct btrfs_root_item
{
601 struct btrfs_inode_item inode
;
607 __le64 last_snapshot
;
610 struct btrfs_disk_key drop_progress
;
615 * The following fields appear after subvol_uuids+subvol_times
620 * This generation number is used to test if the new fields are valid
621 * and up to date while reading the root item. Every time the root item
622 * is written out, the "generation" field is copied into this field. If
623 * anyone ever mounted the fs with an older kernel, we will have
624 * mismatching generation values here and thus must invalidate the
625 * new fields. See btrfs_update_root and btrfs_find_last_root for
627 * the offset of generation_v2 is also used as the start for the memset
628 * when invalidating the fields.
630 __le64 generation_v2
;
631 __u8 uuid
[BTRFS_UUID_SIZE
];
632 __u8 parent_uuid
[BTRFS_UUID_SIZE
];
633 __u8 received_uuid
[BTRFS_UUID_SIZE
];
634 __le64 ctransid
; /* updated when an inode changes */
635 __le64 otransid
; /* trans when created */
636 __le64 stransid
; /* trans when sent. non-zero for received subvol */
637 __le64 rtransid
; /* trans when received. non-zero for received subvol */
638 struct btrfs_timespec ctime
;
639 struct btrfs_timespec otime
;
640 struct btrfs_timespec stime
;
641 struct btrfs_timespec rtime
;
642 __le64 reserved
[8]; /* for future */
643 } __attribute__ ((__packed__
));
646 * this is used for both forward and backward root refs
648 struct btrfs_root_ref
{
652 } __attribute__ ((__packed__
));
654 struct btrfs_disk_balance_args
{
656 * profiles to operate on, single is denoted by
657 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
663 * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
664 * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
677 /* devid subset filter [pstart..pend) */
681 /* btrfs virtual address space subset filter [vstart..vend) */
686 * profile to convert to, single is denoted by
687 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
691 /* BTRFS_BALANCE_ARGS_* */
695 * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
696 * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
708 * Process chunks that cross stripes_min..stripes_max devices,
709 * BTRFS_BALANCE_ARGS_STRIPES_RANGE
715 } __attribute__ ((__packed__
));
718 * store balance parameters to disk so that balance can be properly
719 * resumed after crash or unmount
721 struct btrfs_balance_item
{
722 /* BTRFS_BALANCE_* */
725 struct btrfs_disk_balance_args data
;
726 struct btrfs_disk_balance_args meta
;
727 struct btrfs_disk_balance_args sys
;
730 } __attribute__ ((__packed__
));
732 #define BTRFS_FILE_EXTENT_INLINE 0
733 #define BTRFS_FILE_EXTENT_REG 1
734 #define BTRFS_FILE_EXTENT_PREALLOC 2
736 struct btrfs_file_extent_item
{
738 * transaction id that created this extent
742 * max number of bytes to hold this extent in ram
743 * when we split a compressed extent we can't know how big
744 * each of the resulting pieces will be. So, this is
745 * an upper limit on the size of the extent in ram instead of
751 * 32 bits for the various ways we might encode the data,
752 * including compression and encryption. If any of these
753 * are set to something a given disk format doesn't understand
754 * it is treated like an incompat flag for reading and writing,
759 __le16 other_encoding
; /* spare for later use */
761 /* are we inline data or a real extent? */
765 * disk space consumed by the extent, checksum blocks are included
768 * At this offset in the structure, the inline extent data start.
771 __le64 disk_num_bytes
;
773 * the logical offset in file blocks (no csums)
774 * this extent record is for. This allows a file extent to point
775 * into the middle of an existing extent on disk, sharing it
776 * between two snapshots (useful if some bytes in the middle of the
777 * extent have changed
781 * the logical number of file blocks (no csums included). This
782 * always reflects the size uncompressed and without encoding.
786 } __attribute__ ((__packed__
));
788 struct btrfs_csum_item
{
790 } __attribute__ ((__packed__
));
792 struct btrfs_dev_stats_item
{
794 * grow this item struct at the end for future enhancements and keep
795 * the existing values unchanged
797 __le64 values
[BTRFS_DEV_STAT_VALUES_MAX
];
798 } __attribute__ ((__packed__
));
800 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
801 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
802 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0
803 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1
804 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2
805 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3
806 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4
808 struct btrfs_dev_replace_item
{
810 * grow this item struct at the end for future enhancements and keep
811 * the existing values unchanged
816 __le64 cont_reading_from_srcdev_mode
;
818 __le64 replace_state
;
821 __le64 num_write_errors
;
822 __le64 num_uncorrectable_read_errors
;
823 } __attribute__ ((__packed__
));
825 /* different types of block groups (and chunks) */
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 | \
836 BTRFS_SPACE_INFO_GLOBAL_RSV)
838 enum btrfs_raid_types
{
849 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
850 BTRFS_BLOCK_GROUP_SYSTEM | \
851 BTRFS_BLOCK_GROUP_METADATA)
853 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
854 BTRFS_BLOCK_GROUP_RAID1 | \
855 BTRFS_BLOCK_GROUP_RAID5 | \
856 BTRFS_BLOCK_GROUP_RAID6 | \
857 BTRFS_BLOCK_GROUP_DUP | \
858 BTRFS_BLOCK_GROUP_RAID10)
859 #define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \
860 BTRFS_BLOCK_GROUP_RAID6)
863 * We need a bit for restriper to be able to tell when chunks of type
864 * SINGLE are available. This "extended" profile format is used in
865 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
866 * (on-disk). The corresponding on-disk bit in chunk.type is reserved
867 * to avoid remappings between two formats in future.
869 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
872 * A fake block group type that is used to communicate global block reserve
873 * size to userspace via the SPACE_INFO ioctl.
875 #define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
877 #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
878 BTRFS_AVAIL_ALLOC_BIT_SINGLE)
880 static inline __u64
chunk_to_extended(__u64 flags
)
882 if ((flags
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) == 0)
883 flags
|= BTRFS_AVAIL_ALLOC_BIT_SINGLE
;
887 static inline __u64
extended_to_chunk(__u64 flags
)
889 return flags
& ~BTRFS_AVAIL_ALLOC_BIT_SINGLE
;
892 struct btrfs_block_group_item
{
894 __le64 chunk_objectid
;
896 } __attribute__ ((__packed__
));
898 struct btrfs_free_space_info
{
901 } __attribute__ ((__packed__
));
903 #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
905 #define BTRFS_QGROUP_LEVEL_SHIFT 48
906 static inline __u64
btrfs_qgroup_level(__u64 qgroupid
)
908 return qgroupid
>> BTRFS_QGROUP_LEVEL_SHIFT
;
912 * is subvolume quota turned on?
914 #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
916 * RESCAN is set during the initialization phase
918 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1)
920 * Some qgroup entries are known to be out of date,
921 * either because the configuration has changed in a way that
922 * makes a rescan necessary, or because the fs has been mounted
923 * with a non-qgroup-aware version.
924 * Turning qouta off and on again makes it inconsistent, too.
926 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
928 #define BTRFS_QGROUP_STATUS_VERSION 1
930 struct btrfs_qgroup_status_item
{
933 * the generation is updated during every commit. As older
934 * versions of btrfs are not aware of qgroups, it will be
935 * possible to detect inconsistencies by checking the
936 * generation on mount time
940 /* flag definitions see above */
944 * only used during scanning to record the progress
945 * of the scan. It contains a logical address
948 } __attribute__ ((__packed__
));
950 struct btrfs_qgroup_info_item
{
956 } __attribute__ ((__packed__
));
958 struct btrfs_qgroup_limit_item
{
960 * only updated when any of the other values change
967 } __attribute__ ((__packed__
));
969 #endif /* _BTRFS_CTREE_H_ */