auto +l=J!e8Ep Tţ o _I|+?/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _BTRFS_CTREE_H_ #define _BTRFS_CTREE_H_ #include #include #include /* * This header contains the structure definitions and constants used * by file system objects that can be retrieved using * the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that * is needed to describe a leaf node's key or item contents. */ /* holds pointers to all of the tree roots */ #define BTRFS_ROOT_TREE_OBJECTID 1ULL /* stores information about which extents are in use, and reference counts */ #define BTRFS_EXTENT_TREE_OBJECTID 2ULL /* * chunk tree stores translations from logical -> physical block numbering * the super block points to the chunk tree */ #define BTRFS_CHUNK_TREE_OBJECTID 3ULL /* * stores information about which areas of a given device are in use. * one per device. The tree of tree roots points to the device tree */ #define BTRFS_DEV_TREE_OBJECTID 4ULL /* one per subvolume, storing files and directories */ #define BTRFS_FS_TREE_OBJECTID 5ULL /* directory objectid inside the root tree */ #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL /* holds checksums of all the data extents */ #define BTRFS_CSUM_TREE_OBJECTID 7ULL /* holds quota configuration and tracking */ #define BTRFS_QUOTA_TREE_OBJECTID 8ULL /* for storing items that use the BTRFS_UUID_KEY* types */ #define BTRFS_UUID_TREE_OBJECTID 9ULL /* tracks free space in block groups. */ #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL /* device stats in the device tree */ #define BTRFS_DEV_STATS_OBJECTID 0ULL /* for storing balance parameters in the root tree */ #define BTRFS_BALANCE_OBJECTID -4ULL /* orphan objectid for tracking unlinked/truncated files */ #define BTRFS_ORPHAN_OBJECTID -5ULL /* does write ahead logging to speed up fsyncs */ #define BTRFS_TREE_LOG_OBJECTID -6ULL #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL /* for space balancing */ #define BTRFS_TREE_RELOC_OBJECTID -8ULL #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL /* * extent checksums all have this objectid * this allows them to share the logging tree * for fsyncs */ #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL /* For storing free space cache */ #define BTRFS_FREE_SPACE_OBJECTID -11ULL /* * The inode number assigned to the special inode for storing * free ino cache */ #define BTRFS_FREE_INO_OBJECTID -12ULL /* dummy objectid represents multiple objectids */ #define BTRFS_MULTIPLE_OBJECTIDS -255ULL /* * All files have objectids in this range. */ #define BTRFS_FIRST_FREE_OBJECTID 256ULL #define BTRFS_LAST_FREE_OBJECTID -256ULL #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL /* * the device items go into the chunk tree. The key is in the form * [ 1 BTRFS_DEV_ITEM_KEY device_id ] */ #define BTRFS_DEV_ITEMS_OBJECTID 1ULL #define BTRFS_BTREE_INODE_OBJECTID 1 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2 #define BTRFS_DEV_REPLACE_DEVID 0ULL /* * inode items have the data typically returned from stat and store other * info about object characteristics. There is one for every file and dir in * the FS */ #define BTRFS_INODE_ITEM_KEY 1 #define BTRFS_INODE_REF_KEY 12 #define BTRFS_INODE_EXTREF_KEY 13 #define BTRFS_XATTR_ITEM_KEY 24 #define BTRFS_ORPHAN_ITEM_KEY 48 /* reserve 2-15 close to the inode for later flexibility */ /* * dir items are the name -> inode pointers in a directory. There is one * for every name in a directory. */ #define BTRFS_DIR_LOG_ITEM_KEY 60 #define BTRFS_DIR_LOG_INDEX_KEY 72 #define BTRFS_DIR_ITEM_KEY 84 #define BTRFS_DIR_INDEX_KEY 96 /* * extent data is for file data */ #define BTRFS_EXTENT_DATA_KEY 108 /* * extent csums are stored in a separate tree and hold csums for * an entire extent on disk. */ #define BTRFS_EXTENT_CSUM_KEY 128 /* * root items point to tree roots. They are typically in the root * tree used by the super block to find all the other trees */ #define BTRFS_ROOT_ITEM_KEY 132 /* * root backrefs tie subvols and snapshots to the director