From 53a2ce3b4dcbfd17ac15230da17130a2aeae42dc Mon Sep 17 00:00:00 2001 From: Luke Shumaker Date: Mon, 17 Oct 2022 00:15:06 -0600 Subject: Add and improve comments --- lib/btrfs/btrfsitem/item_freespaceinfo.go | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) (limited to 'lib/btrfs/btrfsitem/item_freespaceinfo.go') diff --git a/lib/btrfs/btrfsitem/item_freespaceinfo.go b/lib/btrfs/btrfsitem/item_freespaceinfo.go index 844f664..b38da20 100644 --- a/lib/btrfs/btrfsitem/item_freespaceinfo.go +++ b/lib/btrfs/btrfsitem/item_freespaceinfo.go @@ -6,10 +6,28 @@ package btrfsitem import ( "git.lukeshu.com/btrfs-progs-ng/lib/binstruct" + "git.lukeshu.com/btrfs-progs-ng/lib/fmtutil" ) +// key.objectid = object ID of the BlockGroup (logical_addr) +// key.offset = offset of the BlockGroup (size) type FreeSpaceInfo struct { // FREE_SPACE_INFO=198 - ExtentCount int32 `bin:"off=0, siz=4"` - Flags uint32 `bin:"off=4, siz=4"` + 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) +} -- cgit v1.2.3-2-g168b