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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsprim
import (
"fmt"
)
type ObjID uint64
const maxUint64pp = 0x1_00000000_00000000
const (
// The IDs of the various trees
ROOT_TREE_OBJECTID ObjID = 1 // holds pointers to all of the tree roots
EXTENT_TREE_OBJECTID ObjID = 2 // stores information about which extents are in use, and reference counts
CHUNK_TREE_OBJECTID ObjID = 3 // chunk tree stores translations from logical -> physical block numbering
DEV_TREE_OBJECTID ObjID = 4 // stores info about which areas of a given device are in use; one per device
FS_TREE_OBJECTID ObjID = 5 // one per subvolume, storing files and directories
ROOT_TREE_DIR_OBJECTID ObjID = 6 // directory objectid inside the root tree
CSUM_TREE_OBJECTID ObjID = 7 // holds checksums of all the data extents
QUOTA_TREE_OBJECTID ObjID = 8
UUID_TREE_OBJECTID ObjID = 9 // for storing items that use the UUID_*_KEY
FREE_SPACE_TREE_OBJECTID ObjID = 10 // tracks free space in block groups.
BLOCK_GROUP_TREE_OBJECTID ObjID = 11 // hold the block group items.
// Objects in the DEV_TREE
DEV_STATS_OBJECTID ObjID = 0 // device stats in the device tree
// ???
BALANCE_OBJECTID ObjID = maxUint64pp - 4 // for storing balance parameters in the root tree
ORPHAN_OBJECTID ObjID = maxUint64pp - 5 // orphan objectid for tracking unlinked/truncated files
TREE_LOG_OBJECTID ObjID = maxUint64pp - 6 // does write ahead logging to speed up fsyncs
TREE_LOG_FIXUP_OBJECTID ObjID = maxUint64pp - 7
TREE_RELOC_OBJECTID ObjID = maxUint64pp - 8 // space balancing
DATA_RELOC_TREE_OBJECTID ObjID = maxUint64pp - 9
EXTENT_CSUM_OBJECTID ObjID = maxUint64pp - 10 // extent checksums all have this objectid
FREE_SPACE_OBJECTID ObjID = maxUint64pp - 11 // For storing free space cache
FREE_INO_OBJECTID ObjID = maxUint64pp - 12 // stores the inode number for the free-ino cache
MULTIPLE_OBJECTIDS ObjID = maxUint64pp - 255 // dummy objectid represents multiple objectids
// All files have objectids in this range.
FIRST_FREE_OBJECTID ObjID = 256
LAST_FREE_OBJECTID ObjID = maxUint64pp - 256
FIRST_CHUNK_TREE_OBJECTID ObjID = 256
// Objects in the CHUNK_TREE
DEV_ITEMS_OBJECTID ObjID = 1
// ???
EMPTY_SUBVOL_DIR_OBJECTID ObjID = 2
)
func (id ObjID) Format(typ ItemType) string {
switch typ {
case PERSISTENT_ITEM_KEY:
names := map[ObjID]string{
DEV_STATS_OBJECTID: "DEV_STATS",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
case DEV_EXTENT_KEY:
return fmt.Sprintf("%d", int64(id))
case QGROUP_RELATION_KEY:
//nolint:gomnd // The left 48 bits are the "qgroup level", and the right 16 bits are the subvolume ID.
return fmt.Sprintf("%d/%d",
uint64(id)>>48,
uint64(id)&((1<<48)-1))
case UUID_SUBVOL_KEY, UUID_RECEIVED_SUBVOL_KEY:
return fmt.Sprintf("%#016x", uint64(id))
case DEV_ITEM_KEY:
names := map[ObjID]string{
BALANCE_OBJECTID: "BALANCE",
ORPHAN_OBJECTID: "ORPHAN",
TREE_LOG_OBJECTID: "TREE_LOG",
TREE_LOG_FIXUP_OBJECTID: "TREE_LOG_FIXUP",
TREE_RELOC_OBJECTID: "TREE_RELOC",
DATA_RELOC_TREE_OBJECTID: "DATA_RELOC_TREE",
EXTENT_CSUM_OBJECTID: "EXTENT_CSUM",
FREE_SPACE_OBJECTID: "FREE_SPACE",
FREE_INO_OBJECTID: "FREE_INO",
MULTIPLE_OBJECTIDS: "MULTIPLE",
DEV_ITEMS_OBJECTID: "DEV_ITEMS",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
case CHUNK_ITEM_KEY:
names := map[ObjID]string{
BALANCE_OBJECTID: "BALANCE",
ORPHAN_OBJECTID: "ORPHAN",
TREE_LOG_OBJECTID: "TREE_LOG",
TREE_LOG_FIXUP_OBJECTID: "TREE_LOG_FIXUP",
TREE_RELOC_OBJECTID: "TREE_RELOC",
DATA_RELOC_TREE_OBJECTID: "DATA_RELOC_TREE",
EXTENT_CSUM_OBJECTID: "EXTENT_CSUM",
FREE_SPACE_OBJECTID: "FREE_SPACE",
FREE_INO_OBJECTID: "FREE_INO",
MULTIPLE_OBJECTIDS: "MULTIPLE",
FIRST_CHUNK_TREE_OBJECTID: "FIRST_CHUNK_TREE",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
default:
names := map[ObjID]string{
BALANCE_OBJECTID: "BALANCE",
ORPHAN_OBJECTID: "ORPHAN",
TREE_LOG_OBJECTID: "TREE_LOG",
TREE_LOG_FIXUP_OBJECTID: "TREE_LOG_FIXUP",
TREE_RELOC_OBJECTID: "TREE_RELOC",
DATA_RELOC_TREE_OBJECTID: "DATA_RELOC_TREE",
EXTENT_CSUM_OBJECTID: "EXTENT_CSUM",
FREE_SPACE_OBJECTID: "FREE_SPACE",
FREE_INO_OBJECTID: "FREE_INO",
MULTIPLE_OBJECTIDS: "MULTIPLE",
ROOT_TREE_OBJECTID: "ROOT_TREE",
EXTENT_TREE_OBJECTID: "EXTENT_TREE",
CHUNK_TREE_OBJECTID: "CHUNK_TREE",
DEV_TREE_OBJECTID: "DEV_TREE",
FS_TREE_OBJECTID: "FS_TREE",
ROOT_TREE_DIR_OBJECTID: "ROOT_TREE_DIR",
CSUM_TREE_OBJECTID: "CSUM_TREE",
QUOTA_TREE_OBJECTID: "QUOTA_TREE",
UUID_TREE_OBJECTID: "UUID_TREE",
FREE_SPACE_TREE_OBJECTID: "FREE_SPACE_TREE",
BLOCK_GROUP_TREE_OBJECTID: "BLOCK_GROUP_TREE",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
}
}
func (id ObjID) String() string {
return id.Format(UNTYPED_KEY)
}
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