From 490cffb1f4ee99b013302cfed9ef849c0676735c Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Wed, 11 May 2022 22:40:03 -0600
Subject: scan for nodes

---
 pkg/btrfs/bitfields.go | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 pkg/btrfs/bitfields.go

(limited to 'pkg/btrfs/bitfields.go')

diff --git a/pkg/btrfs/bitfields.go b/pkg/btrfs/bitfields.go
new file mode 100644
index 0000000..ead4b0f
--- /dev/null
+++ b/pkg/btrfs/bitfields.go
@@ -0,0 +1,68 @@
+package btrfs
+
+import (
+	"fmt"
+	"strings"
+)
+
+func bitfieldString[T ~uint8 | ~uint16 | ~uint32 | ~uint64](bitfield T, bitnames []string) string {
+	if bitfield == 0 {
+		return "0"
+	}
+	var out strings.Builder
+	fmt.Fprintf(&out, "(0x%0X)", uint64(bitfield))
+	rest := bitfield
+	sep := ' '
+	for i := 0; rest != 0; i++ {
+		if rest&(1<<i) != 0 {
+			out.WriteRune(sep)
+			if i < len(bitnames) {
+				out.WriteString(bitnames[i])
+			} else {
+				fmt.Fprintf(&out, "(1<<%d)", i)
+			}
+			sep = '|'
+		}
+		rest &^= 1 << i
+	}
+	return out.String()
+}
+
+type IncompatFlags uint64
+
+const (
+	FeatureIncompatMixedBackref = IncompatFlags(1 << iota)
+	FeatureIncompatDefaultSubvol
+	FeatureIncompatMixedGroups
+	FeatureIncompatCompressLZO
+	FeatureIncompatCompressZSTD
+	FeatureIncompatBigMetadata // buggy
+	FeatureIncompatExtendedIRef
+	FeatureIncompatRAID56
+	FeatureIncompatSkinnyMetadata
+	FeatureIncompatNoHoles
+	FeatureIncompatMetadataUUID
+	FeatureIncompatRAID1C34
+	FeatureIncompatZoned
+	FeatureIncompatExtentTreeV2
+)
+
+var incompatFlagNames = []string{
+	"FeatureIncompatMixedBackref",
+	"FeatureIncompatDefaultSubvol",
+	"FeatureIncompatMixedGroups",
+	"FeatureIncompatCompressLZO",
+	"FeatureIncompatCompressZSTD",
+	"FeatureIncompatBigMetadata ",
+	"FeatureIncompatExtendedIRef",
+	"FeatureIncompatRAID56",
+	"FeatureIncompatSkinnyMetadata",
+	"FeatureIncompatNoHoles",
+	"FeatureIncompatMetadataUUID",
+	"FeatureIncompatRAID1C34",
+	"FeatureIncompatZoned",
+	"FeatureIncompatExtentTreeV2",
+}
+
+func (f IncompatFlags) Has(req IncompatFlags) bool { return f&req == req }
+func (f IncompatFlags) String() string             { return bitfieldString(f, incompatFlagNames) }
-- 
cgit v1.2.3-2-g168b