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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsitem
import (
"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsprim"
)
// ExtentDataRef is part of an Extent.
//
// Key:
//
// key.objectid = laddr of the extent being referenced
// key.offset = crc32c([root,objectid,offset])
type ExtentDataRef struct { // trivial EXTENT_DATA_REF=178
Root btrfsprim.ObjID `bin:"off=0, siz=8"` // subvolume tree ID that references this extent
ObjectID btrfsprim.ObjID `bin:"off=8, siz=8"` // inode number that references this extent within the .Root subvolume
Offset int64 `bin:"off=16, siz=8"` // byte offset for the extent within the file
Count int32 `bin:"off=24, siz=4"` // reference count
binstruct.End `bin:"off=28"`
}
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