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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/fmtutil"
)
// FreeSpaceInfo is the main way (v2) that free space is tracked in a
// BlockGroup. For highly-fragmented blockgorups, it may be augmented
// by a FreeSpaceBitmap.
//
// Key:
//
// key.objectid = object ID of the BlockGroup (logical_addr)
// key.offset = offset of the BlockGroup (size)
type FreeSpaceInfo struct { // trivial FREE_SPACE_INFO=198
ExtentCount int32 `bin:"off=0, siz=4"`
Flags FreeSpaceFlags `bin:"off=4, siz=4"`
binstruct.End `bin:"off=8"`
}
type FreeSpaceFlags uint32
const (
FREE_SPACE_USING_BITMAPS FreeSpaceFlags = 1 << iota
)
var freeSpaceFlagNames = []string{
"USING_BITMAPS",
}
func (f FreeSpaceFlags) Has(req FreeSpaceFlags) bool { return f&req == req }
func (f FreeSpaceFlags) String() string {
return fmtutil.BitfieldString(f, freeSpaceFlagNames, fmtutil.HexNone)
}
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