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package btrfs
import (
"fmt"
)
type ObjID uint64
const maxUint64pp = 0x1_0000_0000
const (
// The IDs of the various trees
BTRFS_ROOT_TREE_OBJECTID = ObjID(1) // holds pointers to all of the tree roots
BTRFS_EXTENT_TREE_OBJECTID = ObjID(2) // stores information about which extents are in use, and reference counts
BTRFS_CHUNK_TREE_OBJECTID = ObjID(3) // chunk tree stores translations from logical -> physical block numbering
BTRFS_DEV_TREE_OBJECTID = ObjID(4) // stores info about which areas of a given device are in use; one per device
BTRFS_FS_TREE_OBJECTID = ObjID(5) // one per subvolume, storing files and directories
BTRFS_ROOT_TREE_DIR_OBJECTID = ObjID(6) // directory objectid inside the root tree
BTRFS_CSUM_TREE_OBJECTID = ObjID(7) // holds checksums of all the data extents
BTRFS_QUOTA_TREE_OBJECTID = ObjID(8)
BTRFS_UUID_TREE_OBJECTID = ObjID(9) // for storing items that use the BTRFS_UUID_KEY*
BTRFS_FREE_SPACE_TREE_OBJECTID = ObjID(10) // tracks free space in block groups.
BTRFS_BLOCK_GROUP_TREE_OBJECTID = ObjID(11) // hold the block group items.
// Objects in the DEV_TREE
BTRFS_DEV_STATS_OBJECTID = ObjID(0) // device stats in the device tree
// ???
BTRFS_BALANCE_OBJECTID = ObjID(maxUint64pp - 4) // for storing balance parameters in the root tree
BTRFS_ORPHAN_OBJECTID = ObjID(maxUint64pp - 5) // orphan objectid for tracking unlinked/truncated files
BTRFS_TREE_LOG_OBJECTID = ObjID(maxUint64pp - 6) // does write ahead logging to speed up fsyncs
BTRFS_TREE_LOG_FIXUP_OBJECTID = ObjID(maxUint64pp - 7)
BTRFS_TREE_RELOC_OBJECTID = ObjID(maxUint64pp - 8) // space balancing
BTRFS_DATA_RELOC_TREE_OBJECTID = ObjID(maxUint64pp - 9)
BTRFS_EXTENT_CSUM_OBJECTID = ObjID(maxUint64pp - 10) // extent checksums all have this objectid
BTRFS_FREE_SPACE_OBJECTID = ObjID(maxUint64pp - 11) // For storing free space cache
BTRFS_FREE_INO_OBJECTID = ObjID(maxUint64pp - 12) // stores the inode number for the free-ino cache
BTRFS_MULTIPLE_OBJECTIDS = ObjID(maxUint64pp - 255) // dummy objectid represents multiple objectids
// All files have objectids in this range.
BTRFS_FIRST_FREE_OBJECTID = ObjID(256)
BTRFS_LAST_FREE_OBJECTID = ObjID(maxUint64pp - 256)
BTRFS_FIRST_CHUNK_TREE_OBJECTID = ObjID(256)
// Objects in the CHUNK_TREE
BTRFS_DEV_ITEMS_OBJECTID = ObjID(1)
// ???
BTRFS_EMPTY_SUBVOL_DIR_OBJECTID = ObjID(2)
)
func (id ObjID) String() string {
if id > BTRFS_LAST_FREE_OBJECTID {
names := map[ObjID]string{
BTRFS_BALANCE_OBJECTID: "BTRFS_BALANCE_OBJECTID",
BTRFS_ORPHAN_OBJECTID: "BTRFS_ORPHAN_OBJECTID",
BTRFS_TREE_LOG_OBJECTID: "BTRFS_TREE_LOG_OBJECTID",
BTRFS_TREE_LOG_FIXUP_OBJECTID: "BTRFS_TREE_LOG_FIXUP_OBJECTID",
BTRFS_TREE_RELOC_OBJECTID: "BTRFS_TREE_RELOC_OBJECTID",
BTRFS_DATA_RELOC_TREE_OBJECTID: "BTRFS_DATA_RELOC_TREE_OBJECTID",
BTRFS_EXTENT_CSUM_OBJECTID: "BTRFS_EXTENT_CSUM_OBJECTID",
BTRFS_FREE_SPACE_OBJECTID: "BTRFS_FREE_SPACE_OBJECTID",
BTRFS_FREE_INO_OBJECTID: "BTRFS_FREE_INO_OBJECTID",
BTRFS_MULTIPLE_OBJECTIDS: "BTRFS_MULTIPLE_OBJECTIDS",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
}
return fmt.Sprintf("%d", id)
}
type TreeObjID ObjID
func (id TreeObjID) String() string {
names := map[ObjID]string{
BTRFS_ROOT_TREE_OBJECTID: "BTRFS_ROOT_TREE_OBJECTID",
BTRFS_EXTENT_TREE_OBJECTID: "BTRFS_EXTENT_TREE_OBJECTID",
BTRFS_CHUNK_TREE_OBJECTID: "BTRFS_CHUNK_TREE_OBJECTID",
BTRFS_DEV_TREE_OBJECTID: "BTRFS_DEV_TREE_OBJECTID",
BTRFS_FS_TREE_OBJECTID: "BTRFS_FS_TREE_OBJECTID",
BTRFS_ROOT_TREE_DIR_OBJECTID: "BTRFS_ROOT_TREE_DIR_OBJECTID",
BTRFS_CSUM_TREE_OBJECTID: "BTRFS_CSUM_TREE_OBJECTID",
BTRFS_QUOTA_TREE_OBJECTID: "BTRFS_QUOTA_TREE_OBJECTID",
BTRFS_UUID_TREE_OBJECTID: "BTRFS_UUID_TREE_OBJECTID",
BTRFS_FREE_SPACE_TREE_OBJECTID: "BTRFS_FREE_SPACE_TREE_OBJECTID",
BTRFS_BLOCK_GROUP_TREE_OBJECTID: "BTRFS_BLOCK_GROUP_TREE_OBJECTID",
}
if name, ok := names[ObjID(id)]; ok {
return name
}
return ObjID(id).String()
}
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