994 строки
25 KiB
C
994 строки
25 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _BTRFS_CTREE_H_
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#define _BTRFS_CTREE_H_
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#include <linux/btrfs.h>
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#include <linux/types.h>
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#ifdef __KERNEL__
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#include <linux/stddef.h>
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#else
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#include <stddef.h>
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#endif
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/*
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* This header contains the structure definitions and constants used
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* by file system objects that can be retrieved using
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* the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that
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* is needed to describe a leaf node's key or item contents.
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*/
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/* holds pointers to all of the tree roots */
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#define BTRFS_ROOT_TREE_OBJECTID 1ULL
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/* stores information about which extents are in use, and reference counts */
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#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
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/*
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* chunk tree stores translations from logical -> physical block numbering
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* the super block points to the chunk tree
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*/
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#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
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/*
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* stores information about which areas of a given device are in use.
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* one per device. The tree of tree roots points to the device tree
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*/
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#define BTRFS_DEV_TREE_OBJECTID 4ULL
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/* one per subvolume, storing files and directories */
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#define BTRFS_FS_TREE_OBJECTID 5ULL
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/* directory objectid inside the root tree */
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#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
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/* holds checksums of all the data extents */
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#define BTRFS_CSUM_TREE_OBJECTID 7ULL
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/* holds quota configuration and tracking */
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#define BTRFS_QUOTA_TREE_OBJECTID 8ULL
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/* for storing items that use the BTRFS_UUID_KEY* types */
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#define BTRFS_UUID_TREE_OBJECTID 9ULL
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/* tracks free space in block groups. */
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#define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
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/* device stats in the device tree */
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#define BTRFS_DEV_STATS_OBJECTID 0ULL
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/* for storing balance parameters in the root tree */
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#define BTRFS_BALANCE_OBJECTID -4ULL
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/* orhpan objectid for tracking unlinked/truncated files */
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#define BTRFS_ORPHAN_OBJECTID -5ULL
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/* does write ahead logging to speed up fsyncs */
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#define BTRFS_TREE_LOG_OBJECTID -6ULL
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#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
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/* for space balancing */
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#define BTRFS_TREE_RELOC_OBJECTID -8ULL
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#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
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/*
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* extent checksums all have this objectid
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* this allows them to share the logging tree
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* for fsyncs
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*/
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#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
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/* For storing free space cache */
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#define BTRFS_FREE_SPACE_OBJECTID -11ULL
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/*
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* The inode number assigned to the special inode for storing
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* free ino cache
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*/
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#define BTRFS_FREE_INO_OBJECTID -12ULL
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/* dummy objectid represents multiple objectids */
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#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
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/*
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* All files have objectids in this range.
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*/
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#define BTRFS_FIRST_FREE_OBJECTID 256ULL
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#define BTRFS_LAST_FREE_OBJECTID -256ULL
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#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
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/*
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* the device items go into the chunk tree. The key is in the form
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* [ 1 BTRFS_DEV_ITEM_KEY device_id ]
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*/
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#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
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#define BTRFS_BTREE_INODE_OBJECTID 1
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#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
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#define BTRFS_DEV_REPLACE_DEVID 0ULL
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/*
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* inode items have the data typically returned from stat and store other
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* info about object characteristics. There is one for every file and dir in
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* the FS
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*/
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#define BTRFS_INODE_ITEM_KEY 1
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#define BTRFS_INODE_REF_KEY 12
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#define BTRFS_INODE_EXTREF_KEY 13
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#define BTRFS_XATTR_ITEM_KEY 24
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#define BTRFS_ORPHAN_ITEM_KEY 48
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/* reserve 2-15 close to the inode for later flexibility */
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/*
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* dir items are the name -> inode pointers in a directory. There is one
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* for every name in a directory.
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*/
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#define BTRFS_DIR_LOG_ITEM_KEY 60
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#define BTRFS_DIR_LOG_INDEX_KEY 72
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#define BTRFS_DIR_ITEM_KEY 84
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#define BTRFS_DIR_INDEX_KEY 96
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/*
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* extent data is for file data
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*/
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#define BTRFS_EXTENT_DATA_KEY 108
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/*
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* extent csums are stored in a separate tree and hold csums for
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* an entire extent on disk.
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*/
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#define BTRFS_EXTENT_CSUM_KEY 128
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/*
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* root items point to tree roots. They are typically in the root
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* tree used by the super block to find all the other trees
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*/
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#define BTRFS_ROOT_ITEM_KEY 132
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/*
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* root backrefs tie subvols and snapshots to the directory entries that
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* reference them
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*/
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#define BTRFS_ROOT_BACKREF_KEY 144
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/*
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* root refs make a fast index for listing all of the snapshots and
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* subvolumes referenced by a given root. They point directly to the
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* directory item in the root that references the subvol
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*/
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#define BTRFS_ROOT_REF_KEY 156
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/*
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* extent items are in the extent map tree. These record which blocks
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* are used, and how many references there are to each block
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*/
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#define BTRFS_EXTENT_ITEM_KEY 168
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/*
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* The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
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* the length, so we save the level in key->offset instead of the length.
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*/
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#define BTRFS_METADATA_ITEM_KEY 169
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#define BTRFS_TREE_BLOCK_REF_KEY 176
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#define BTRFS_EXTENT_DATA_REF_KEY 178
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#define BTRFS_EXTENT_REF_V0_KEY 180
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#define BTRFS_SHARED_BLOCK_REF_KEY 182
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#define BTRFS_SHARED_DATA_REF_KEY 184
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/*
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* block groups give us hints into the extent allocation trees. Which
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* blocks are free etc etc
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*/
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#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
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/*
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* Every block group is represented in the free space tree by a free space info
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* item, which stores some accounting information. It is keyed on
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* (block_group_start, FREE_SPACE_INFO, block_group_length).
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*/
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#define BTRFS_FREE_SPACE_INFO_KEY 198
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/*
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* A free space extent tracks an extent of space that is free in a block group.
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* It is keyed on (start, FREE_SPACE_EXTENT, length).
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*/
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#define BTRFS_FREE_SPACE_EXTENT_KEY 199
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/*
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* When a block group becomes very fragmented, we convert it to use bitmaps
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* instead of extents. A free space bitmap is keyed on
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* (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
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* (length / sectorsize) bits.
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*/
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#define BTRFS_FREE_SPACE_BITMAP_KEY 200
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#define BTRFS_DEV_EXTENT_KEY 204
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#define BTRFS_DEV_ITEM_KEY 216
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#define BTRFS_CHUNK_ITEM_KEY 228
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/*
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* Records the overall state of the qgroups.
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* There's only one instance of this key present,
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* (0, BTRFS_QGROUP_STATUS_KEY, 0)
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*/
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#define BTRFS_QGROUP_STATUS_KEY 240
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/*
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* Records the currently used space of the qgroup.
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* One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
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*/
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#define BTRFS_QGROUP_INFO_KEY 242
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/*
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* Contains the user configured limits for the qgroup.
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* One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
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*/
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#define BTRFS_QGROUP_LIMIT_KEY 244
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/*
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* Records the child-parent relationship of qgroups. For
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* each relation, 2 keys are present:
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* (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
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* (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
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*/
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#define BTRFS_QGROUP_RELATION_KEY 246
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/*
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* Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
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*/
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#define BTRFS_BALANCE_ITEM_KEY 248
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/*
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* The key type for tree items that are stored persistently, but do not need to
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* exist for extended period of time. The items can exist in any tree.
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*
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* [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
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*
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* Existing items:
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*
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* - balance status item
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* (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
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*/
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#define BTRFS_TEMPORARY_ITEM_KEY 248
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/*
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* Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
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*/
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#define BTRFS_DEV_STATS_KEY 249
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/*
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* The key type for tree items that are stored persistently and usually exist
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* for a long period, eg. filesystem lifetime. The item kinds can be status
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* information, stats or preference values. The item can exist in any tree.
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*
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* [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
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*
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* Existing items:
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*
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* - device statistics, store IO stats in the device tree, one key for all
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* stats
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* (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
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*/
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#define BTRFS_PERSISTENT_ITEM_KEY 249
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/*
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* Persistantly stores the device replace state in the device tree.
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* The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
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*/
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#define BTRFS_DEV_REPLACE_KEY 250
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/*
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* Stores items that allow to quickly map UUIDs to something else.
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* These items are part of the filesystem UUID tree.
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* The key is built like this:
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* (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
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*/
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#if BTRFS_UUID_SIZE != 16
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#error "UUID items require BTRFS_UUID_SIZE == 16!"
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#endif
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#define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
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#define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
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* received subvols */
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/*
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* string items are for debugging. They just store a short string of
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* data in the FS
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*/
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#define BTRFS_STRING_ITEM_KEY 253
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/* 32 bytes in various csum fields */
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#define BTRFS_CSUM_SIZE 32
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/* csum types */
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enum btrfs_csum_type {
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BTRFS_CSUM_TYPE_CRC32 = 0,
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BTRFS_CSUM_TYPE_XXHASH = 1,
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BTRFS_CSUM_TYPE_SHA256 = 2,
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BTRFS_CSUM_TYPE_BLAKE2 = 3,
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};
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/*
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* flags definitions for directory entry item type
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*
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* Used by:
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* struct btrfs_dir_item.type
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*
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* Values 0..7 must match common file type values in fs_types.h.
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*/
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#define BTRFS_FT_UNKNOWN 0
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#define BTRFS_FT_REG_FILE 1
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#define BTRFS_FT_DIR 2
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#define BTRFS_FT_CHRDEV 3
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#define BTRFS_FT_BLKDEV 4
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#define BTRFS_FT_FIFO 5
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#define BTRFS_FT_SOCK 6
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#define BTRFS_FT_SYMLINK 7
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#define BTRFS_FT_XATTR 8
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#define BTRFS_FT_MAX 9
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/*
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* The key defines the order in the tree, and so it also defines (optimal)
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* block layout.
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*
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* objectid corresponds to the inode number.
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*
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* type tells us things about the object, and is a kind of stream selector.
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* so for a given inode, keys with type of 1 might refer to the inode data,
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* type of 2 may point to file data in the btree and type == 3 may point to
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* extents.
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*
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* offset is the starting byte offset for this key in the stream.
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*
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* btrfs_disk_key is in disk byte order. struct btrfs_key is always
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* in cpu native order. Otherwise they are identical and their sizes
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* should be the same (ie both packed)
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*/
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struct btrfs_disk_key {
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__le64 objectid;
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__u8 type;
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__le64 offset;
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} __attribute__ ((__packed__));
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struct btrfs_key {
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__u64 objectid;
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__u8 type;
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__u64 offset;
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} __attribute__ ((__packed__));
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struct btrfs_dev_item {
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/* the internal btrfs device id */
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__le64 devid;
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/* size of the device */
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__le64 total_bytes;
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/* bytes used */
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__le64 bytes_used;
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/* optimal io alignment for this device */
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__le32 io_align;
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/* optimal io width for this device */
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__le32 io_width;
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/* minimal io size for this device */
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__le32 sector_size;
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/* type and info about this device */
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__le64 type;
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/* expected generation for this device */
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__le64 generation;
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/*
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* starting byte of this partition on the device,
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* to allow for stripe alignment in the future
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*/
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__le64 start_offset;
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/* grouping information for allocation decisions */
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__le32 dev_group;
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/* seek speed 0-100 where 100 is fastest */
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__u8 seek_speed;
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/* bandwidth 0-100 where 100 is fastest */
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__u8 bandwidth;
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/* btrfs generated uuid for this device */
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__u8 uuid[BTRFS_UUID_SIZE];
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/* uuid of FS who owns this device */
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__u8 fsid[BTRFS_UUID_SIZE];
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} __attribute__ ((__packed__));
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struct btrfs_stripe {
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__le64 devid;
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__le64 offset;
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__u8 dev_uuid[BTRFS_UUID_SIZE];
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} __attribute__ ((__packed__));
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struct btrfs_chunk {
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/* size of this chunk in bytes */
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__le64 length;
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/* objectid of the root referencing this chunk */
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__le64 owner;
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__le64 stripe_len;
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__le64 type;
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/* optimal io alignment for this chunk */
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__le32 io_align;
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/* optimal io width for this chunk */
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__le32 io_width;
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/* minimal io size for this chunk */
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__le32 sector_size;
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/* 2^16 stripes is quite a lot, a second limit is the size of a single
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* item in the btree
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*/
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__le16 num_stripes;
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/* sub stripes only matter for raid10 */
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__le16 sub_stripes;
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struct btrfs_stripe stripe;
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/* additional stripes go here */
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} __attribute__ ((__packed__));
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#define BTRFS_FREE_SPACE_EXTENT 1
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#define BTRFS_FREE_SPACE_BITMAP 2
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struct btrfs_free_space_entry {
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__le64 offset;
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__le64 bytes;
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__u8 type;
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} __attribute__ ((__packed__));
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struct btrfs_free_space_header {
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struct btrfs_disk_key location;
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__le64 generation;
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__le64 num_entries;
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__le64 num_bitmaps;
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} __attribute__ ((__packed__));
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#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
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#define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
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/* Super block flags */
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/* Errors detected */
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#define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
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#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
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#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
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#define BTRFS_SUPER_FLAG_METADUMP_V2 (1ULL << 34)
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#define BTRFS_SUPER_FLAG_CHANGING_FSID (1ULL << 35)
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#define BTRFS_SUPER_FLAG_CHANGING_FSID_V2 (1ULL << 36)
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/*
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* items in the extent btree are used to record the objectid of the
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* owner of the block and the number of references
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*/
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struct btrfs_extent_item {
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__le64 refs;
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__le64 generation;
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__le64 flags;
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} __attribute__ ((__packed__));
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struct btrfs_extent_item_v0 {
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__le32 refs;
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} __attribute__ ((__packed__));
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#define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
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#define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
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/* following flags only apply to tree blocks */
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/* use full backrefs for extent pointers in the block */
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#define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
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/*
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* this flag is only used internally by scrub and may be changed at any time
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* it is only declared here to avoid collisions
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*/
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#define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
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struct btrfs_tree_block_info {
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struct btrfs_disk_key key;
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__u8 level;
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} __attribute__ ((__packed__));
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struct btrfs_extent_data_ref {
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__le64 root;
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__le64 objectid;
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__le64 offset;
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__le32 count;
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} __attribute__ ((__packed__));
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struct btrfs_shared_data_ref {
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__le32 count;
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} __attribute__ ((__packed__));
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struct btrfs_extent_inline_ref {
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__u8 type;
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__le64 offset;
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} __attribute__ ((__packed__));
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/* dev extents record free space on individual devices. The owner
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* field points back to the chunk allocation mapping tree that allocated
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* the extent. The chunk tree uuid field is a way to double check the owner
|
|
*/
|
|
struct btrfs_dev_extent {
|
|
__le64 chunk_tree;
|
|
__le64 chunk_objectid;
|
|
__le64 chunk_offset;
|
|
__le64 length;
|
|
__u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_inode_ref {
|
|
__le64 index;
|
|
__le16 name_len;
|
|
/* name goes here */
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_inode_extref {
|
|
__le64 parent_objectid;
|
|
__le64 index;
|
|
__le16 name_len;
|
|
__u8 name[0];
|
|
/* name goes here */
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_timespec {
|
|
__le64 sec;
|
|
__le32 nsec;
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_inode_item {
|
|
/* nfs style generation number */
|
|
__le64 generation;
|
|
/* transid that last touched this inode */
|
|
__le64 transid;
|
|
__le64 size;
|
|
__le64 nbytes;
|
|
__le64 block_group;
|
|
__le32 nlink;
|
|
__le32 uid;
|
|
__le32 gid;
|
|
__le32 mode;
|
|
__le64 rdev;
|
|
__le64 flags;
|
|
|
|
/* modification sequence number for NFS */
|
|
__le64 sequence;
|
|
|
|
/*
|
|
* a little future expansion, for more than this we can
|
|
* just grow the inode item and version it
|
|
*/
|
|
__le64 reserved[4];
|
|
struct btrfs_timespec atime;
|
|
struct btrfs_timespec ctime;
|
|
struct btrfs_timespec mtime;
|
|
struct btrfs_timespec otime;
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_dir_log_item {
|
|
__le64 end;
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_dir_item {
|
|
struct btrfs_disk_key location;
|
|
__le64 transid;
|
|
__le16 data_len;
|
|
__le16 name_len;
|
|
__u8 type;
|
|
} __attribute__ ((__packed__));
|
|
|
|
#define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
|
|
|
|
/*
|
|
* Internal in-memory flag that a subvolume has been marked for deletion but
|
|
* still visible as a directory
|
|
*/
|
|
#define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
|
|
|
|
struct btrfs_root_item {
|
|
struct btrfs_inode_item inode;
|
|
__le64 generation;
|
|
__le64 root_dirid;
|
|
__le64 bytenr;
|
|
__le64 byte_limit;
|
|
__le64 bytes_used;
|
|
__le64 last_snapshot;
|
|
__le64 flags;
|
|
__le32 refs;
|
|
struct btrfs_disk_key drop_progress;
|
|
__u8 drop_level;
|
|
__u8 level;
|
|
|
|
/*
|
|
* The following fields appear after subvol_uuids+subvol_times
|
|
* were introduced.
|
|
*/
|
|
|
|
/*
|
|
* This generation number is used to test if the new fields are valid
|
|
* and up to date while reading the root item. Every time the root item
|
|
* is written out, the "generation" field is copied into this field. If
|
|
* anyone ever mounted the fs with an older kernel, we will have
|
|
* mismatching generation values here and thus must invalidate the
|
|
* new fields. See btrfs_update_root and btrfs_find_last_root for
|
|
* details.
|
|
* the offset of generation_v2 is also used as the start for the memset
|
|
* when invalidating the fields.
|
|
*/
|
|
__le64 generation_v2;
|
|
__u8 uuid[BTRFS_UUID_SIZE];
|
|
__u8 parent_uuid[BTRFS_UUID_SIZE];
|
|
__u8 received_uuid[BTRFS_UUID_SIZE];
|
|
__le64 ctransid; /* updated when an inode changes */
|
|
__le64 otransid; /* trans when created */
|
|
__le64 stransid; /* trans when sent. non-zero for received subvol */
|
|
__le64 rtransid; /* trans when received. non-zero for received subvol */
|
|
struct btrfs_timespec ctime;
|
|
struct btrfs_timespec otime;
|
|
struct btrfs_timespec stime;
|
|
struct btrfs_timespec rtime;
|
|
__le64 reserved[8]; /* for future */
|
|
} __attribute__ ((__packed__));
|
|
|
|
/*
|
|
* Btrfs root item used to be smaller than current size. The old format ends
|
|
* at where member generation_v2 is.
|
|
*/
|
|
static inline __u32 btrfs_legacy_root_item_size(void)
|
|
{
|
|
return offsetof(struct btrfs_root_item, generation_v2);
|
|
}
|
|
|
|
/*
|
|
* this is used for both forward and backward root refs
|
|
*/
|
|
struct btrfs_root_ref {
|
|
__le64 dirid;
|
|
__le64 sequence;
|
|
__le16 name_len;
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_disk_balance_args {
|
|
/*
|
|
* profiles to operate on, single is denoted by
|
|
* BTRFS_AVAIL_ALLOC_BIT_SINGLE
|
|
*/
|
|
__le64 profiles;
|
|
|
|
/*
|
|
* usage filter
|
|
* BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
|
|
* BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
|
|
*/
|
|
union {
|
|
__le64 usage;
|
|
struct {
|
|
__le32 usage_min;
|
|
__le32 usage_max;
|
|
};
|
|
};
|
|
|
|
/* devid filter */
|
|
__le64 devid;
|
|
|
|
/* devid subset filter [pstart..pend) */
|
|
__le64 pstart;
|
|
__le64 pend;
|
|
|
|
/* btrfs virtual address space subset filter [vstart..vend) */
|
|
__le64 vstart;
|
|
__le64 vend;
|
|
|
|
/*
|
|
* profile to convert to, single is denoted by
|
|
* BTRFS_AVAIL_ALLOC_BIT_SINGLE
|
|
*/
|
|
__le64 target;
|
|
|
|
/* BTRFS_BALANCE_ARGS_* */
|
|
__le64 flags;
|
|
|
|
/*
|
|
* BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
|
|
* BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
|
|
* and maximum
|
|
*/
|
|
union {
|
|
__le64 limit;
|
|
struct {
|
|
__le32 limit_min;
|
|
__le32 limit_max;
|
|
};
|
|
};
|
|
|
|
/*
|
|
* Process chunks that cross stripes_min..stripes_max devices,
|
|
* BTRFS_BALANCE_ARGS_STRIPES_RANGE
|
|
*/
|
|
__le32 stripes_min;
|
|
__le32 stripes_max;
|
|
|
|
__le64 unused[6];
|
|
} __attribute__ ((__packed__));
|
|
|
|
/*
|
|
* store balance parameters to disk so that balance can be properly
|
|
* resumed after crash or unmount
|
|
*/
|
|
struct btrfs_balance_item {
|
|
/* BTRFS_BALANCE_* */
|
|
__le64 flags;
|
|
|
|
struct btrfs_disk_balance_args data;
|
|
struct btrfs_disk_balance_args meta;
|
|
struct btrfs_disk_balance_args sys;
|
|
|
|
__le64 unused[4];
|
|
} __attribute__ ((__packed__));
|
|
|
|
enum {
|
|
BTRFS_FILE_EXTENT_INLINE = 0,
|
|
BTRFS_FILE_EXTENT_REG = 1,
|
|
BTRFS_FILE_EXTENT_PREALLOC = 2,
|
|
BTRFS_NR_FILE_EXTENT_TYPES = 3,
|
|
};
|
|
|
|
struct btrfs_file_extent_item {
|
|
/*
|
|
* transaction id that created this extent
|
|
*/
|
|
__le64 generation;
|
|
/*
|
|
* max number of bytes to hold this extent in ram
|
|
* when we split a compressed extent we can't know how big
|
|
* each of the resulting pieces will be. So, this is
|
|
* an upper limit on the size of the extent in ram instead of
|
|
* an exact limit.
|
|
*/
|
|
__le64 ram_bytes;
|
|
|
|
/*
|
|
* 32 bits for the various ways we might encode the data,
|
|
* including compression and encryption. If any of these
|
|
* are set to something a given disk format doesn't understand
|
|
* it is treated like an incompat flag for reading and writing,
|
|
* but not for stat.
|
|
*/
|
|
__u8 compression;
|
|
__u8 encryption;
|
|
__le16 other_encoding; /* spare for later use */
|
|
|
|
/* are we inline data or a real extent? */
|
|
__u8 type;
|
|
|
|
/*
|
|
* disk space consumed by the extent, checksum blocks are included
|
|
* in these numbers
|
|
*
|
|
* At this offset in the structure, the inline extent data start.
|
|
*/
|
|
__le64 disk_bytenr;
|
|
__le64 disk_num_bytes;
|
|
/*
|
|
* the logical offset in file blocks (no csums)
|
|
* this extent record is for. This allows a file extent to point
|
|
* into the middle of an existing extent on disk, sharing it
|
|
* between two snapshots (useful if some bytes in the middle of the
|
|
* extent have changed
|
|
*/
|
|
__le64 offset;
|
|
/*
|
|
* the logical number of file blocks (no csums included). This
|
|
* always reflects the size uncompressed and without encoding.
|
|
*/
|
|
__le64 num_bytes;
|
|
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_csum_item {
|
|
__u8 csum;
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_dev_stats_item {
|
|
/*
|
|
* grow this item struct at the end for future enhancements and keep
|
|
* the existing values unchanged
|
|
*/
|
|
__le64 values[BTRFS_DEV_STAT_VALUES_MAX];
|
|
} __attribute__ ((__packed__));
|
|
|
|
#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
|
|
#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
|
|
|
|
struct btrfs_dev_replace_item {
|
|
/*
|
|
* grow this item struct at the end for future enhancements and keep
|
|
* the existing values unchanged
|
|
*/
|
|
__le64 src_devid;
|
|
__le64 cursor_left;
|
|
__le64 cursor_right;
|
|
__le64 cont_reading_from_srcdev_mode;
|
|
|
|
__le64 replace_state;
|
|
__le64 time_started;
|
|
__le64 time_stopped;
|
|
__le64 num_write_errors;
|
|
__le64 num_uncorrectable_read_errors;
|
|
} __attribute__ ((__packed__));
|
|
|
|
/* different types of block groups (and chunks) */
|
|
#define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
|
|
#define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
|
|
#define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
|
|
#define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
|
|
#define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
|
|
#define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
|
|
#define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
|
|
#define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
|
|
#define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
|
|
#define BTRFS_BLOCK_GROUP_RAID1C3 (1ULL << 9)
|
|
#define BTRFS_BLOCK_GROUP_RAID1C4 (1ULL << 10)
|
|
#define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
|
|
BTRFS_SPACE_INFO_GLOBAL_RSV)
|
|
|
|
enum btrfs_raid_types {
|
|
BTRFS_RAID_RAID10,
|
|
BTRFS_RAID_RAID1,
|
|
BTRFS_RAID_DUP,
|
|
BTRFS_RAID_RAID0,
|
|
BTRFS_RAID_SINGLE,
|
|
BTRFS_RAID_RAID5,
|
|
BTRFS_RAID_RAID6,
|
|
BTRFS_RAID_RAID1C3,
|
|
BTRFS_RAID_RAID1C4,
|
|
BTRFS_NR_RAID_TYPES
|
|
};
|
|
|
|
#define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
|
|
BTRFS_BLOCK_GROUP_SYSTEM | \
|
|
BTRFS_BLOCK_GROUP_METADATA)
|
|
|
|
#define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
|
|
BTRFS_BLOCK_GROUP_RAID1 | \
|
|
BTRFS_BLOCK_GROUP_RAID1C3 | \
|
|
BTRFS_BLOCK_GROUP_RAID1C4 | \
|
|
BTRFS_BLOCK_GROUP_RAID5 | \
|
|
BTRFS_BLOCK_GROUP_RAID6 | \
|
|
BTRFS_BLOCK_GROUP_DUP | \
|
|
BTRFS_BLOCK_GROUP_RAID10)
|
|
#define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \
|
|
BTRFS_BLOCK_GROUP_RAID6)
|
|
|
|
#define BTRFS_BLOCK_GROUP_RAID1_MASK (BTRFS_BLOCK_GROUP_RAID1 | \
|
|
BTRFS_BLOCK_GROUP_RAID1C3 | \
|
|
BTRFS_BLOCK_GROUP_RAID1C4)
|
|
|
|
/*
|
|
* We need a bit for restriper to be able to tell when chunks of type
|
|
* SINGLE are available. This "extended" profile format is used in
|
|
* fs_info->avail_*_alloc_bits (in-memory) and balance item fields
|
|
* (on-disk). The corresponding on-disk bit in chunk.type is reserved
|
|
* to avoid remappings between two formats in future.
|
|
*/
|
|
#define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
|
|
|
|
/*
|
|
* A fake block group type that is used to communicate global block reserve
|
|
* size to userspace via the SPACE_INFO ioctl.
|
|
*/
|
|
#define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
|
|
|
|
#define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
|
|
BTRFS_AVAIL_ALLOC_BIT_SINGLE)
|
|
|
|
static inline __u64 chunk_to_extended(__u64 flags)
|
|
{
|
|
if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
|
|
flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
|
|
|
|
return flags;
|
|
}
|
|
static inline __u64 extended_to_chunk(__u64 flags)
|
|
{
|
|
return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
|
|
}
|
|
|
|
struct btrfs_block_group_item {
|
|
__le64 used;
|
|
__le64 chunk_objectid;
|
|
__le64 flags;
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_free_space_info {
|
|
__le32 extent_count;
|
|
__le32 flags;
|
|
} __attribute__ ((__packed__));
|
|
|
|
#define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
|
|
|
|
#define BTRFS_QGROUP_LEVEL_SHIFT 48
|
|
static inline __u16 btrfs_qgroup_level(__u64 qgroupid)
|
|
{
|
|
return (__u16)(qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT);
|
|
}
|
|
|
|
/*
|
|
* is subvolume quota turned on?
|
|
*/
|
|
#define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
|
|
/*
|
|
* RESCAN is set during the initialization phase
|
|
*/
|
|
#define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1)
|
|
/*
|
|
* Some qgroup entries are known to be out of date,
|
|
* either because the configuration has changed in a way that
|
|
* makes a rescan necessary, or because the fs has been mounted
|
|
* with a non-qgroup-aware version.
|
|
* Turning qouta off and on again makes it inconsistent, too.
|
|
*/
|
|
#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
|
|
|
|
#define BTRFS_QGROUP_STATUS_VERSION 1
|
|
|
|
struct btrfs_qgroup_status_item {
|
|
__le64 version;
|
|
/*
|
|
* the generation is updated during every commit. As older
|
|
* versions of btrfs are not aware of qgroups, it will be
|
|
* possible to detect inconsistencies by checking the
|
|
* generation on mount time
|
|
*/
|
|
__le64 generation;
|
|
|
|
/* flag definitions see above */
|
|
__le64 flags;
|
|
|
|
/*
|
|
* only used during scanning to record the progress
|
|
* of the scan. It contains a logical address
|
|
*/
|
|
__le64 rescan;
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_qgroup_info_item {
|
|
__le64 generation;
|
|
__le64 rfer;
|
|
__le64 rfer_cmpr;
|
|
__le64 excl;
|
|
__le64 excl_cmpr;
|
|
} __attribute__ ((__packed__));
|
|
|
|
struct btrfs_qgroup_limit_item {
|
|
/*
|
|
* only updated when any of the other values change
|
|
*/
|
|
__le64 flags;
|
|
__le64 max_rfer;
|
|
__le64 max_excl;
|
|
__le64 rsv_rfer;
|
|
__le64 rsv_excl;
|
|
} __attribute__ ((__packed__));
|
|
|
|
#endif /* _BTRFS_CTREE_H_ */
|