Fix package names/imports

31 files changed, 94 insertions, 93 deletions

diff --git a/lib/btrfs/aliases.go b/lib/btrfs/aliases.go
index 5115654..6fe5661 100644
--- a/lib/btrfs/aliases.go
+++ b/lib/btrfs/aliases.go
@@ -6,7 +6,6 @@ package btrfs
 
 import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
 type (
@@ -19,5 +18,5 @@ type (
 
 	Key  = internal.Key
 	Time = internal.Time
-	UUID = util.UUID
+	UUID = internal.UUID
 )
diff --git a/lib/btrfs/btrfsitem/item_chunk.go b/lib/btrfs/btrfsitem/item_chunk.go
index 2ccc860..754d650 100644
--- a/lib/btrfs/btrfsitem/item_chunk.go
+++ b/lib/btrfs/btrfsitem/item_chunk.go
@@ -8,7 +8,6 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
 // Maps logical address to physical.
@@ -36,7 +35,7 @@ type ChunkHeader struct {
 type ChunkStripe struct {
 	DeviceID      btrfsvol.DeviceID     `bin:"off=0x0,  siz=0x8"`
 	Offset        btrfsvol.PhysicalAddr `bin:"off=0x8,  siz=0x8"`
-	DeviceUUID    util.UUID             `bin:"off=0x10, siz=0x10"`
+	DeviceUUID    internal.UUID         `bin:"off=0x10, siz=0x10"`
 	binstruct.End `bin:"off=0x20"`
 }
 
diff --git a/lib/btrfs/btrfsitem/item_dev.go b/lib/btrfs/btrfsitem/item_dev.go
index 9c3781d..020f2ca 100644
--- a/lib/btrfs/btrfsitem/item_dev.go
+++ b/lib/btrfs/btrfsitem/item_dev.go
@@ -8,7 +8,6 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
 // key.objectid = BTRFS_DEV_ITEMS_OBJECTID
@@ -30,8 +29,8 @@ type Dev struct { // DEV_ITEM=216
 	SeekSpeed   uint8               `bin:"off=0x40,   siz=0x1"`
 	Bandwidth   uint8               `bin:"off=0x41,   siz=0x1"`
 
-	DevUUID util.UUID `bin:"off=0x42,   siz=0x10"`
-	FSUUID  util.UUID `bin:"off=0x52,   siz=0x10"`
+	DevUUID internal.UUID `bin:"off=0x42,   siz=0x10"`
+	FSUUID  internal.UUID `bin:"off=0x52,   siz=0x10"`
 
 	binstruct.End `bin:"off=0x62"`
 }
diff --git a/lib/btrfs/btrfsitem/item_devextent.go b/lib/btrfs/btrfsitem/item_devextent.go
index 3185bb0..8eca935 100644
--- a/lib/btrfs/btrfsitem/item_devextent.go
+++ b/lib/btrfs/btrfsitem/item_devextent.go
@@ -8,7 +8,6 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
 // key.objectid = device_id
@@ -18,7 +17,7 @@ type DevExtent struct { // DEV_EXTENT=204
 	ChunkObjectID internal.ObjID       `bin:"off=8, siz=8"`
 	ChunkOffset   btrfsvol.LogicalAddr `bin:"off=16, siz=8"`
 	Length        btrfsvol.AddrDelta   `bin:"off=24, siz=8"`
-	ChunkTreeUUID util.UUID            `bin:"off=32, siz=16"`
+	ChunkTreeUUID internal.UUID        `bin:"off=32, siz=16"`
 	binstruct.End `bin:"off=48"`
 }
 
diff --git a/lib/btrfs/btrfsitem/item_extent.go b/lib/btrfs/btrfsitem/item_extent.go
index d49243d..e8cd9b9 100644
--- a/lib/btrfs/btrfsitem/item_extent.go
+++ b/lib/btrfs/btrfsitem/item_extent.go
@@ -9,7 +9,7 @@ import (
 
 	"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type Extent struct { // EXTENT_ITEM=168
@@ -91,7 +91,9 @@ var extentFlagNames = []string{
 }
 
 func (f ExtentFlags) Has(req ExtentFlags) bool { return f&req == req }
-func (f ExtentFlags) String() string           { return util.BitfieldString(f, extentFlagNames, util.HexNone) }
+func (f ExtentFlags) String() string {
+	return fmtutil.BitfieldString(f, extentFlagNames, fmtutil.HexNone)
+}
 
 type ExtentInlineRef struct {
 	Type   Type   // only 4 valid values: {TREE,SHARED}_BLOCK_REF_KEY, {EXTENT,SHARED}_DATA_REF_KEY
diff --git a/lib/btrfs/btrfsitem/item_inode.go b/lib/btrfs/btrfsitem/item_inode.go
index 0fb637e..27204f6 100644
--- a/lib/btrfs/btrfsitem/item_inode.go
+++ b/lib/btrfs/btrfsitem/item_inode.go
@@ -7,8 +7,7 @@ package btrfsitem
 import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"
-	"git.lukeshu.com/btrfs-progs-ng/lib/linux"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type Inode struct { // INODE_ITEM=1
@@ -20,7 +19,7 @@ type Inode struct { // INODE_ITEM=1
 	NLink         int32               `bin:"off=0x28, siz=0x04"` // stat
 	UID           int32               `bin:"off=0x2C, siz=0x04"` // stat
 	GID           int32               `bin:"off=0x30, siz=0x04"` // stat
-	Mode          linux.StatMode      `bin:"off=0x34, siz=0x04"` // stat
+	Mode          StatMode            `bin:"off=0x34, siz=0x04"` // stat
 	RDev          int64               `bin:"off=0x38, siz=0x08"` // stat
 	Flags         InodeFlags          `bin:"off=0x40, siz=0x08"` // statx.stx_attributes, sorta
 	Sequence      int64               `bin:"off=0x48, siz=0x08"` // NFS
@@ -65,4 +64,6 @@ var inodeFlagNames = []string{
 }
 
 func (f InodeFlags) Has(req InodeFlags) bool { return f&req == req }
-func (f InodeFlags) String() string          { return util.BitfieldString(f, inodeFlagNames, util.HexLower) }
+func (f InodeFlags) String() string {
+	return fmtutil.BitfieldString(f, inodeFlagNames, fmtutil.HexLower)
+}
diff --git a/lib/btrfs/btrfsitem/item_root.go b/lib/btrfs/btrfsitem/item_root.go
index d1781ec..7725363 100644
--- a/lib/btrfs/btrfsitem/item_root.go
+++ b/lib/btrfs/btrfsitem/item_root.go
@@ -8,7 +8,7 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type Root struct { // ROOT_ITEM=132
@@ -25,9 +25,9 @@ type Root struct { // ROOT_ITEM=132
 	DropLevel     uint8                `bin:"off=0x0ed, siz=0x01"`
 	Level         uint8                `bin:"off=0x0ee, siz=0x01"`
 	GenerationV2  internal.Generation  `bin:"off=0x0ef, siz=0x08"`
-	UUID          util.UUID            `bin:"off=0x0f7, siz=0x10"`
-	ParentUUID    util.UUID            `bin:"off=0x107, siz=0x10"`
-	ReceivedUUID  util.UUID            `bin:"off=0x117, siz=0x10"`
+	UUID          internal.UUID        `bin:"off=0x0f7, siz=0x10"`
+	ParentUUID    internal.UUID        `bin:"off=0x107, siz=0x10"`
+	ReceivedUUID  internal.UUID        `bin:"off=0x117, siz=0x10"`
 	CTransID      int64                `bin:"off=0x127, siz=0x08"`
 	OTransID      int64                `bin:"off=0x12f, siz=0x08"`
 	STransID      int64                `bin:"off=0x137, siz=0x08"`
@@ -52,4 +52,4 @@ var rootFlagNames = []string{
 }
 
 func (f RootFlags) Has(req RootFlags) bool { return f&req == req }
-func (f RootFlags) String() string         { return util.BitfieldString(f, rootFlagNames, util.HexLower) }
+func (f RootFlags) String() string         { return fmtutil.BitfieldString(f, rootFlagNames, fmtutil.HexLower) }
diff --git a/lib/btrfs/btrfsitem/statmode.go b/lib/btrfs/btrfsitem/statmode.go
index 2cca56d..a1302ee 100644
--- a/lib/btrfs/btrfsitem/statmode.go
+++ b/lib/btrfs/btrfsitem/statmode.go
@@ -5,7 +5,7 @@
 //
 // Based on https://github.com/datawire/ocibuild/blob/master/pkg/python/stat.go
 
-package linux
+package btrfsitem
 
 type StatMode uint32
 
diff --git a/lib/btrfs/btrfssum/csum.go b/lib/btrfs/btrfssum/csum.go
index 231393b..8f9ac1a 100644
--- a/lib/btrfs/btrfssum/csum.go
+++ b/lib/btrfs/btrfssum/csum.go
@@ -10,7 +10,7 @@ import (
 	"fmt"
 	"hash/crc32"
 
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type CSum [0x20]byte
@@ -24,7 +24,7 @@ func (csum CSum) Fmt(typ CSumType) string {
 }
 
 func (csum CSum) Format(f fmt.State, verb rune) {
-	util.FormatByteArrayStringer(csum, csum[:], f, verb)
+	fmtutil.FormatByteArrayStringer(csum, csum[:], f, verb)
 }
 
 type CSumType uint16
diff --git a/lib/btrfs/btrfsvol/addr.go b/lib/btrfs/btrfsvol/addr.go
index 9df95ce..640a3e8 100644
--- a/lib/btrfs/btrfsvol/addr.go
+++ b/lib/btrfs/btrfsvol/addr.go
@@ -7,7 +7,7 @@ package btrfsvol
 import (
 	"fmt"
 
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type (
@@ -20,9 +20,9 @@ func formatAddr(addr int64, f fmt.State, verb rune) {
 	switch verb {
 	case 'v', 's', 'q':
 		str := fmt.Sprintf("%#016x", addr)
-		fmt.Fprintf(f, util.FmtStateString(f, verb), str)
+		fmt.Fprintf(f, fmtutil.FmtStateString(f, verb), str)
 	default:
-		fmt.Fprintf(f, util.FmtStateString(f, verb), addr)
+		fmt.Fprintf(f, fmtutil.FmtStateString(f, verb), addr)
 	}
 }
 
diff --git a/lib/btrfs/btrfsvol/blockgroupflags.go b/lib/btrfs/btrfsvol/blockgroupflags.go
index 4aed12c..4ca5544 100644
--- a/lib/btrfs/btrfsvol/blockgroupflags.go
+++ b/lib/btrfs/btrfsvol/blockgroupflags.go
@@ -5,7 +5,7 @@
 package btrfsvol
 
 import (
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type BlockGroupFlags uint64
@@ -43,7 +43,7 @@ var blockGroupFlagNames = []string{
 
 func (f BlockGroupFlags) Has(req BlockGroupFlags) bool { return f&req == req }
 func (f BlockGroupFlags) String() string {
-	ret := util.BitfieldString(f, blockGroupFlagNames, util.HexNone)
+	ret := fmtutil.BitfieldString(f, blockGroupFlagNames, fmtutil.HexNone)
 	if f&BLOCK_GROUP_RAID_MASK == 0 {
 		if ret == "" {
 			ret = "single"
diff --git a/lib/btrfs/btrfsvol/lvm.go b/lib/btrfs/btrfsvol/lvm.go
index 62ca6d7..4d40ccd 100644
--- a/lib/btrfs/btrfsvol/lvm.go
+++ b/lib/btrfs/btrfsvol/lvm.go
@@ -11,10 +11,10 @@ import (
 	"reflect"
 
 	"git.lukeshu.com/btrfs-progs-ng/lib/containers"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 )
 
-type LogicalVolume[PhysicalVolume util.File[PhysicalAddr]] struct {
+type LogicalVolume[PhysicalVolume diskio.File[PhysicalAddr]] struct {
 	name string
 
 	id2pv map[DeviceID]PhysicalVolume
@@ -23,7 +23,7 @@ type LogicalVolume[PhysicalVolume util.File[PhysicalAddr]] struct {
 	physical2logical map[DeviceID]*containers.RBTree[containers.NativeOrdered[PhysicalAddr], devextMapping]
 }
 
-var _ util.File[LogicalAddr] = (*LogicalVolume[util.File[PhysicalAddr]])(nil)
+var _ diskio.File[LogicalAddr] = (*LogicalVolume[diskio.File[PhysicalAddr]])(nil)
 
 func (lv *LogicalVolume[PhysicalVolume]) init() {
 	if lv.id2pv == nil {
diff --git a/lib/btrfs/internal/uuid.go b/lib/btrfs/internal/uuid.go
index a16d10f..3749b1a 100644
--- a/lib/btrfs/internal/uuid.go
+++ b/lib/btrfs/internal/uuid.go
@@ -2,12 +2,14 @@
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-package util
+package internal
 
 import (
 	"encoding/hex"
 	"fmt"
 	"strings"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type UUID [16]byte
@@ -33,7 +35,7 @@ func (a UUID) Cmp(b UUID) int {
 }
 
 func (uuid UUID) Format(f fmt.State, verb rune) {
-	FormatByteArrayStringer(uuid, uuid[:], f, verb)
+	fmtutil.FormatByteArrayStringer(uuid, uuid[:], f, verb)
 }
 
 func ParseUUID(str string) (UUID, error) {
diff --git a/lib/btrfs/internal/uuid_test.go b/lib/btrfs/internal/uuid_test.go
index 747ff6b..dfc3688 100644
--- a/lib/btrfs/internal/uuid_test.go
+++ b/lib/btrfs/internal/uuid_test.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-package util_test
+package internal_test
 
 import (
 	"fmt"
@@ -10,18 +10,18 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"
 )
 
 func TestParseUUID(t *testing.T) {
 	t.Parallel()
 	type TestCase struct {
 		Input     string
-		OutputVal util.UUID
+		OutputVal internal.UUID
 		OutputErr string
 	}
 	testcases := map[string]TestCase{
-		"basic":    {Input: "a0dd94ed-e60c-42e8-8632-64e8d4765a43", OutputVal: util.UUID{0xa0, 0xdd, 0x94, 0xed, 0xe6, 0x0c, 0x42, 0xe8, 0x86, 0x32, 0x64, 0xe8, 0xd4, 0x76, 0x5a, 0x43}},
+		"basic":    {Input: "a0dd94ed-e60c-42e8-8632-64e8d4765a43", OutputVal: internal.UUID{0xa0, 0xdd, 0x94, 0xed, 0xe6, 0x0c, 0x42, 0xe8, 0x86, 0x32, 0x64, 0xe8, 0xd4, 0x76, 0x5a, 0x43}},
 		"too-long": {Input: "a0dd94ed-e60c-42e8-8632-64e8d4765a43a", OutputErr: `too long to be a UUID: "a0dd94ed-e60c-42e8-8632-64e8d4765a43"|"a"`},
 		"bad char": {Input: "a0dd94ej-e60c-42e8-8632-64e8d4765a43a", OutputErr: `illegal byte in UUID: "a0dd94e"|"j"|"-e60c-42e8-8632-64e8d4765a43a"`},
 	}
@@ -29,7 +29,7 @@ func TestParseUUID(t *testing.T) {
 		tc := tc
 		t.Run(tcName, func(t *testing.T) {
 			t.Parallel()
-			val, err := util.ParseUUID(tc.Input)
+			val, err := internal.ParseUUID(tc.Input)
 			assert.Equal(t, tc.OutputVal, val)
 			if tc.OutputErr == "" {
 				assert.NoError(t, err)
@@ -43,18 +43,18 @@ func TestParseUUID(t *testing.T) {
 func TestUUIDFormat(t *testing.T) {
 	t.Parallel()
 	type TestCase struct {
-		InputUUID util.UUID
+		InputUUID internal.UUID
 		InputFmt  string
 		Output    string
 	}
-	uuid := util.MustParseUUID("a0dd94ed-e60c-42e8-8632-64e8d4765a43")
+	uuid := internal.MustParseUUID("a0dd94ed-e60c-42e8-8632-64e8d4765a43")
 	testcases := map[string]TestCase{
 		"s":     {InputUUID: uuid, InputFmt: "%s", Output: "a0dd94ed-e60c-42e8-8632-64e8d4765a43"},
 		"x":     {InputUUID: uuid, InputFmt: "%x", Output: "a0dd94ede60c42e8863264e8d4765a43"},
 		"X":     {InputUUID: uuid, InputFmt: "%X", Output: "A0DD94EDE60C42E8863264E8D4765A43"},
 		"v":     {InputUUID: uuid, InputFmt: "%v", Output: "a0dd94ed-e60c-42e8-8632-64e8d4765a43"},
 		"40s":   {InputUUID: uuid, InputFmt: "|% 40s", Output: "|    a0dd94ed-e60c-42e8-8632-64e8d4765a43"},
-		"#115v": {InputUUID: uuid, InputFmt: "|%#115v", Output: "|           util.UUID{0xa0, 0xdd, 0x94, 0xed, 0xe6, 0xc, 0x42, 0xe8, 0x86, 0x32, 0x64, 0xe8, 0xd4, 0x76, 0x5a, 0x43}"},
+		"#115v": {InputUUID: uuid, InputFmt: "|%#115v", Output: "|       internal.UUID{0xa0, 0xdd, 0x94, 0xed, 0xe6, 0xc, 0x42, 0xe8, 0x86, 0x32, 0x64, 0xe8, 0xd4, 0x76, 0x5a, 0x43}"},
 	}
 	for tcName, tc := range testcases {
 		tc := tc
diff --git a/lib/btrfs/io1_pv.go b/lib/btrfs/io1_pv.go
index 44a8d76..10b6e32 100644
--- a/lib/btrfs/io1_pv.go
+++ b/lib/btrfs/io1_pv.go
@@ -10,17 +10,17 @@ import (
 
 	"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 )
 
 type Device struct {
 	*os.File
 
-	cacheSuperblocks []*util.Ref[btrfsvol.PhysicalAddr, Superblock]
+	cacheSuperblocks []*diskio.Ref[btrfsvol.PhysicalAddr, Superblock]
 	cacheSuperblock  *Superblock
 }
 
-var _ util.File[btrfsvol.PhysicalAddr] = (*Device)(nil)
+var _ diskio.File[btrfsvol.PhysicalAddr] = (*Device)(nil)
 
 func (dev Device) Size() (btrfsvol.PhysicalAddr, error) {
 	fi, err := dev.Stat()
@@ -44,7 +44,7 @@ var SuperblockAddrs = []btrfsvol.PhysicalAddr{
 	0x40_0000_0000, // 256GiB
 }
 
-func (dev *Device) Superblocks() ([]*util.Ref[btrfsvol.PhysicalAddr, Superblock], error) {
+func (dev *Device) Superblocks() ([]*diskio.Ref[btrfsvol.PhysicalAddr, Superblock], error) {
 	if dev.cacheSuperblocks != nil {
 		return dev.cacheSuperblocks, nil
 	}
@@ -55,10 +55,10 @@ func (dev *Device) Superblocks() ([]*util.Ref[btrfsvol.PhysicalAddr, Superblock]
 		return nil, err
 	}
 
-	var ret []*util.Ref[btrfsvol.PhysicalAddr, Superblock]
+	var ret []*diskio.Ref[btrfsvol.PhysicalAddr, Superblock]
 	for i, addr := range SuperblockAddrs {
 		if addr+superblockSize <= sz {
-			superblock := &util.Ref[btrfsvol.PhysicalAddr, Superblock]{
+			superblock := &diskio.Ref[btrfsvol.PhysicalAddr, Superblock]{
 				File: dev,
 				Addr: addr,
 			}
diff --git a/lib/btrfs/io2_lv.go b/lib/btrfs/io2_lv.go
index b3f9276..47ab474 100644
--- a/lib/btrfs/io2_lv.go
+++ b/lib/btrfs/io2_lv.go
@@ -14,7 +14,7 @@ import (
 
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 )
 
 type FS struct {
@@ -22,11 +22,11 @@ type FS struct {
 	// implementing special things like fsck.
 	LV btrfsvol.LogicalVolume[*Device]
 
-	cacheSuperblocks []*util.Ref[btrfsvol.PhysicalAddr, Superblock]
+	cacheSuperblocks []*diskio.Ref[btrfsvol.PhysicalAddr, Superblock]
 	cacheSuperblock  *Superblock
 }
 
-var _ util.File[btrfsvol.LogicalAddr] = (*FS)(nil)
+var _ diskio.File[btrfsvol.LogicalAddr] = (*FS)(nil)
 
 func (fs *FS) AddDevice(ctx context.Context, dev *Device) error {
 	sb, err := dev.Superblock()
@@ -72,11 +72,11 @@ func (fs *FS) Resolve(laddr btrfsvol.LogicalAddr) (paddrs map[btrfsvol.Qualified
 	return fs.LV.Resolve(laddr)
 }
 
-func (fs *FS) Superblocks() ([]*util.Ref[btrfsvol.PhysicalAddr, Superblock], error) {
+func (fs *FS) Superblocks() ([]*diskio.Ref[btrfsvol.PhysicalAddr, Superblock], error) {
 	if fs.cacheSuperblocks != nil {
 		return fs.cacheSuperblocks, nil
 	}
-	var ret []*util.Ref[btrfsvol.PhysicalAddr, Superblock]
+	var ret []*diskio.Ref[btrfsvol.PhysicalAddr, Superblock]
 	devs := fs.LV.PhysicalVolumes()
 	if len(devs) == 0 {
 		return nil, fmt.Errorf("no devices")
diff --git a/lib/btrfs/io3_btree.go b/lib/btrfs/io3_btree.go
index f476dae..553bf41 100644
--- a/lib/btrfs/io3_btree.go
+++ b/lib/btrfs/io3_btree.go
@@ -15,8 +15,8 @@ import (
 
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 	"git.lukeshu.com/btrfs-progs-ng/lib/slices"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
 type Trees interface {
@@ -260,9 +260,9 @@ func LookupTreeRoot(fs Trees, treeID ObjID) (*TreeRoot, error) {
 type TreeWalkHandler struct {
 	// Callbacks for entire nodes
 	PreNode  func(TreePath) error
-	Node     func(TreePath, *util.Ref[btrfsvol.LogicalAddr, Node]) error
-	BadNode  func(TreePath, *util.Ref[btrfsvol.LogicalAddr, Node], error) error
-	PostNode func(TreePath, *util.Ref[btrfsvol.LogicalAddr, Node]) error
+	Node     func(TreePath, *diskio.Ref[btrfsvol.LogicalAddr, Node]) error
+	BadNode  func(TreePath, *diskio.Ref[btrfsvol.LogicalAddr, Node], error) error
+	PostNode func(TreePath, *diskio.Ref[btrfsvol.LogicalAddr, Node]) error
 	// Callbacks for items on internal nodes
 	PreKeyPointer  func(TreePath, KeyPointer) error
 	PostKeyPointer func(TreePath, KeyPointer) error
@@ -402,7 +402,7 @@ func (fs *FS) treeWalk(ctx context.Context, path TreePath, errHandle func(*TreeE
 	}
 }
 
-func (fs *FS) treeSearch(treeRoot TreeRoot, fn func(Key) int) (TreePath, *util.Ref[btrfsvol.LogicalAddr, Node], error) {
+func (fs *FS) treeSearch(treeRoot TreeRoot, fn func(Key) int) (TreePath, *diskio.Ref[btrfsvol.LogicalAddr, Node], error) {
 	path := TreePath{
 		TreeID: treeRoot.TreeID,
 		Nodes: []TreePathElem{
@@ -487,7 +487,7 @@ func (fs *FS) treeSearch(treeRoot TreeRoot, fn func(Key) int) (TreePath, *util.R
 	}
 }
 
-func (fs *FS) prev(path TreePath, node *util.Ref[btrfsvol.LogicalAddr, Node]) (TreePath, *util.Ref[btrfsvol.LogicalAddr, Node], error) {
+func (fs *FS) prev(path TreePath, node *diskio.Ref[btrfsvol.LogicalAddr, Node]) (TreePath, *diskio.Ref[btrfsvol.LogicalAddr, Node], error) {
 	var err error
 	path = path.DeepCopy()
 
@@ -539,7 +539,7 @@ func (fs *FS) prev(path TreePath, node *util.Ref[btrfsvol.LogicalAddr, Node]) (T
 	return path, node, nil
 }
 
-func (fs *FS) next(path TreePath, node *util.Ref[btrfsvol.LogicalAddr, Node]) (TreePath, *util.Ref[btrfsvol.LogicalAddr, Node], error) {
+func (fs *FS) next(path TreePath, node *diskio.Ref[btrfsvol.LogicalAddr, Node]) (TreePath, *diskio.Ref[btrfsvol.LogicalAddr, Node], error) {
 	var err error
 	path = path.DeepCopy()
 
diff --git a/lib/btrfs/io4_fs.go b/lib/btrfs/io4_fs.go
index cae2771..701230e 100644
--- a/lib/btrfs/io4_fs.go
+++ b/lib/btrfs/io4_fs.go
@@ -19,7 +19,6 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/containers"
 	"git.lukeshu.com/btrfs-progs-ng/lib/maps"
 	"git.lukeshu.com/btrfs-progs-ng/lib/slices"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
 type BareInode struct {
@@ -65,10 +64,10 @@ type Subvolume struct {
 	rootVal  btrfsitem.Root
 	rootErr  error
 
-	bareInodeCache util.LRUCache[ObjID, *BareInode]
-	fullInodeCache util.LRUCache[ObjID, *FullInode]
-	dirCache       util.LRUCache[ObjID, *Dir]
-	fileCache      util.LRUCache[ObjID, *File]
+	bareInodeCache containers.LRUCache[ObjID, *BareInode]
+	fullInodeCache containers.LRUCache[ObjID, *FullInode]
+	dirCache       containers.LRUCache[ObjID, *Dir]
+	fileCache      containers.LRUCache[ObjID, *File]
 }
 
 func (sv *Subvolume) init() {
diff --git a/lib/btrfs/types_node.go b/lib/btrfs/types_node.go
index fc12a00..781b2fa 100644
--- a/lib/btrfs/types_node.go
+++ b/lib/btrfs/types_node.go
@@ -13,7 +13,8 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfssum"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type NodeFlags uint64
@@ -50,7 +51,7 @@ var nodeFlagNames = []string{
 }
 
 func (f NodeFlags) Has(req NodeFlags) bool { return f&req == req }
-func (f NodeFlags) String() string         { return util.BitfieldString(f, nodeFlagNames, util.HexLower) }
+func (f NodeFlags) String() string         { return fmtutil.BitfieldString(f, nodeFlagNames, fmtutil.HexLower) }
 
 type BackrefRev uint8
 
@@ -347,7 +348,7 @@ func (node *Node) LeafFreeSpace() uint32 {
 
 var ErrNotANode = errors.New("does not look like a node")
 
-func ReadNode[Addr ~int64](fs util.File[Addr], sb Superblock, addr Addr, laddrCB func(btrfsvol.LogicalAddr) error) (*util.Ref[Addr, Node], error) {
+func ReadNode[Addr ~int64](fs diskio.File[Addr], sb Superblock, addr Addr, laddrCB func(btrfsvol.LogicalAddr) error) (*diskio.Ref[Addr, Node], error) {
 	nodeBuf := make([]byte, sb.NodeSize)
 	if _, err := fs.ReadAt(nodeBuf, addr); err != nil {
 		return nil, err
@@ -355,7 +356,7 @@ func ReadNode[Addr ~int64](fs util.File[Addr], sb Superblock, addr Addr, laddrCB
 
 	// parse (early)
 
-	nodeRef := &util.Ref[Addr, Node]{
+	nodeRef := &diskio.Ref[Addr, Node]{
 		File: fs,
 		Addr: addr,
 		Data: Node{
@@ -400,7 +401,7 @@ func ReadNode[Addr ~int64](fs util.File[Addr], sb Superblock, addr Addr, laddrCB
 	return nodeRef, nil
 }
 
-func (fs *FS) ReadNode(addr btrfsvol.LogicalAddr) (*util.Ref[btrfsvol.LogicalAddr, Node], error) {
+func (fs *FS) ReadNode(addr btrfsvol.LogicalAddr) (*diskio.Ref[btrfsvol.LogicalAddr, Node], error) {
 	sb, err := fs.Superblock()
 	if err != nil {
 		return nil, fmt.Errorf("btrfs.FS.ReadNode: %w", err)
@@ -415,7 +416,7 @@ func (fs *FS) ReadNode(addr btrfsvol.LogicalAddr) (*util.Ref[btrfsvol.LogicalAdd
 	})
 }
 
-func (fs *FS) readNodeAtLevel(addr btrfsvol.LogicalAddr, expLevel uint8) (*util.Ref[btrfsvol.LogicalAddr, Node], error) {
+func (fs *FS) readNodeAtLevel(addr btrfsvol.LogicalAddr, expLevel uint8) (*diskio.Ref[btrfsvol.LogicalAddr, Node], error) {
 	node, err := fs.ReadNode(addr)
 	if err != nil {
 		return node, err
diff --git a/lib/btrfs/types_superblock.go b/lib/btrfs/types_superblock.go
index 30adb86..68c5d56 100644
--- a/lib/btrfs/types_superblock.go
+++ b/lib/btrfs/types_superblock.go
@@ -12,7 +12,7 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfssum"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type Superblock struct {
@@ -233,5 +233,5 @@ var incompatFlagNames = []string{
 
 func (f IncompatFlags) Has(req IncompatFlags) bool { return f&req == req }
 func (f IncompatFlags) String() string {
-	return util.BitfieldString(f, incompatFlagNames, util.HexLower)
+	return fmtutil.BitfieldString(f, incompatFlagNames, fmtutil.HexLower)
 }
diff --git a/lib/btrfsprogs/btrfsinspect/mount.go b/lib/btrfsprogs/btrfsinspect/mount.go
index c882c65..05f3b9b 100644
--- a/lib/btrfsprogs/btrfsinspect/mount.go
+++ b/lib/btrfsprogs/btrfsinspect/mount.go
@@ -25,7 +25,6 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
 	"git.lukeshu.com/btrfs-progs-ng/lib/containers"
-	"git.lukeshu.com/btrfs-progs-ng/lib/linux"
 	"git.lukeshu.com/btrfs-progs-ng/lib/maps"
 	"git.lukeshu.com/btrfs-progs-ng/lib/slices"
 )
@@ -258,7 +257,7 @@ func (sv *subvolume) LookUpInode(_ context.Context, op *fuseops.LookUpInodeOp) e
 			Child: 2, // an inode number that a real file will never have
 			Attributes: fuseops.InodeAttributes{
 				Nlink: 1,
-				Mode:  uint32(linux.ModeFmtDir | 0700),
+				Mode:  uint32(btrfsitem.ModeFmtDir | 0700),
 			},
 		}
 		return nil
diff --git a/lib/btrfsprogs/btrfsinspect/print_tree.go b/lib/btrfsprogs/btrfsinspect/print_tree.go
index 8aef98a..960dcce 100644
--- a/lib/btrfsprogs/btrfsinspect/print_tree.go
+++ b/lib/btrfsprogs/btrfsinspect/print_tree.go
@@ -17,6 +17,7 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfssum"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 	"git.lukeshu.com/btrfs-progs-ng/lib/slices"
 	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
@@ -95,7 +96,7 @@ func DumpTrees(ctx context.Context, out io.Writer, fs *btrfs.FS) {
 func printTree(ctx context.Context, out io.Writer, fs *btrfs.FS, treeID btrfs.ObjID) {
 	var itemOffset uint32
 	handlers := btrfs.TreeWalkHandler{
-		Node: func(path btrfs.TreePath, nodeRef *util.Ref[btrfsvol.LogicalAddr, btrfs.Node]) error {
+		Node: func(path btrfs.TreePath, nodeRef *diskio.Ref[btrfsvol.LogicalAddr, btrfs.Node]) error {
 			printHeaderInfo(out, nodeRef.Data)
 			itemOffset = nodeRef.Data.Size - uint32(binstruct.StaticSize(btrfs.NodeHeader{}))
 			return nil
diff --git a/lib/btrfsprogs/btrfsinspect/recoverchunks.go b/lib/btrfsprogs/btrfsinspect/recoverchunks.go
index 4f01d0a..27ac85b 100644
--- a/lib/btrfsprogs/btrfsinspect/recoverchunks.go
+++ b/lib/btrfsprogs/btrfsinspect/recoverchunks.go
@@ -14,8 +14,8 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 	"git.lukeshu.com/btrfs-progs-ng/lib/maps"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
 type ScanOneDevResult struct {
@@ -158,7 +158,7 @@ func ScanOneDev(ctx context.Context, dev *btrfs.Device, superblock btrfs.Superbl
 	devSize, _ := dev.Size()
 	lastProgress := -1
 
-	err := btrfsutil.ScanForNodes(ctx, dev, superblock, func(nodeRef *util.Ref[btrfsvol.PhysicalAddr, btrfs.Node], err error) {
+	err := btrfsutil.ScanForNodes(ctx, dev, superblock, func(nodeRef *diskio.Ref[btrfsvol.PhysicalAddr, btrfs.Node], err error) {
 		if err != nil {
 			dlog.Infof(ctx, "... dev[%q] error: %v", dev.Name(), err)
 			return
diff --git a/lib/btrfsprogs/btrfsrepair/clearnodes.go b/lib/btrfsprogs/btrfsrepair/clearnodes.go
index 9fa5a6a..9f1e42c 100644
--- a/lib/btrfsprogs/btrfsrepair/clearnodes.go
+++ b/lib/btrfsprogs/btrfsrepair/clearnodes.go
@@ -14,7 +14,7 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 )
 
 func ClearBadNodes(ctx context.Context, fs *btrfs.FS) error {
@@ -26,7 +26,7 @@ func ClearBadNodes(ctx context.Context, fs *btrfs.FS) error {
 			dlog.Error(ctx, err)
 		},
 		TreeWalkHandler: btrfs.TreeWalkHandler{
-			Node: func(path btrfs.TreePath, node *util.Ref[btrfsvol.LogicalAddr, btrfs.Node]) error {
+			Node: func(path btrfs.TreePath, node *diskio.Ref[btrfsvol.LogicalAddr, btrfs.Node]) error {
 				if !uuidsInited {
 					metadataUUID = node.Data.Head.MetadataUUID
 					chunkTreeUUID = node.Data.Head.ChunkTreeUUID
@@ -34,7 +34,7 @@ func ClearBadNodes(ctx context.Context, fs *btrfs.FS) error {
 				}
 				return nil
 			},
-			BadNode: func(path btrfs.TreePath, node *util.Ref[btrfsvol.LogicalAddr, btrfs.Node], err error) error {
+			BadNode: func(path btrfs.TreePath, node *diskio.Ref[btrfsvol.LogicalAddr, btrfs.Node], err error) error {
 				if !errors.Is(err, btrfs.ErrNotANode) {
 					return err
 				}
diff --git a/lib/btrfsprogs/btrfsutil/broken_btree.go b/lib/btrfsprogs/btrfsutil/broken_btree.go
index d2dc81c..6c97fcb 100644
--- a/lib/btrfsprogs/btrfsutil/broken_btree.go
+++ b/lib/btrfsprogs/btrfsutil/broken_btree.go
@@ -15,7 +15,7 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
 	"git.lukeshu.com/btrfs-progs-ng/lib/containers"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 )
 
 type indexItem struct {
@@ -170,7 +170,7 @@ func (bt *brokenTrees) TreeSearchAll(treeID btrfs.ObjID, fn func(btrfs.Key) int)
 	}
 
 	ret := make([]btrfs.Item, len(indexItems))
-	var node *util.Ref[btrfsvol.LogicalAddr, btrfs.Node]
+	var node *diskio.Ref[btrfsvol.LogicalAddr, btrfs.Node]
 	for i := range indexItems {
 		if node == nil || node.Addr != indexItems[i].Path.Node(-2).NodeAddr {
 			var err error
@@ -195,7 +195,7 @@ func (bt *brokenTrees) TreeWalk(ctx context.Context, treeID btrfs.ObjID, errHand
 		})
 		return
 	}
-	var node *util.Ref[btrfsvol.LogicalAddr, btrfs.Node]
+	var node *diskio.Ref[btrfsvol.LogicalAddr, btrfs.Node]
 	_ = index.Walk(func(indexItem *containers.RBNode[indexItem]) error {
 		if ctx.Err() != nil {
 			return ctx.Err()
diff --git a/lib/btrfsprogs/btrfsutil/scan.go b/lib/btrfsprogs/btrfsutil/scan.go
index 7189e99..dd77747 100644
--- a/lib/btrfsprogs/btrfsutil/scan.go
+++ b/lib/btrfsprogs/btrfsutil/scan.go
@@ -11,15 +11,15 @@ import (
 
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
+	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 	"git.lukeshu.com/btrfs-progs-ng/lib/slices"
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
 )
 
 // ScanForNodes mimics btrfs-progs
 // cmds/rescue-chunk-recover.c:scan_one_device(), except rather than
 // doing something itself when it finds a node, it simply calls a
 // callback function.
-func ScanForNodes(ctx context.Context, dev *btrfs.Device, sb btrfs.Superblock, fn func(*util.Ref[btrfsvol.PhysicalAddr, btrfs.Node], error), prog func(btrfsvol.PhysicalAddr)) error {
+func ScanForNodes(ctx context.Context, dev *btrfs.Device, sb btrfs.Superblock, fn func(*diskio.Ref[btrfsvol.PhysicalAddr, btrfs.Node], error), prog func(btrfsvol.PhysicalAddr)) error {
 	devSize, err := dev.Size()
 	if err != nil {
 		return err
diff --git a/lib/containers/lru.go b/lib/containers/lru.go
index 80f5ff5..8b8eb0e 100644
--- a/lib/containers/lru.go
+++ b/lib/containers/lru.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-package util
+package containers
 
 import (
 	"sync"
diff --git a/lib/diskio/ref.go b/lib/diskio/ref.go
index fe284d7..9782743 100644
--- a/lib/diskio/ref.go
+++ b/lib/diskio/ref.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-package util
+package diskio
 
 import (
 	"fmt"
diff --git a/lib/fmtutil/bitfield.go b/lib/fmtutil/bitfield.go
index b3dbe0a..d46fee5 100644
--- a/lib/fmtutil/bitfield.go
+++ b/lib/fmtutil/bitfield.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-package util
+package fmtutil
 
 import (
 	"fmt"
diff --git a/lib/fmtutil/fmt.go b/lib/fmtutil/fmt.go
index c36ba2a..a45ac58 100644
--- a/lib/fmtutil/fmt.go
+++ b/lib/fmtutil/fmt.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-package util
+package fmtutil
 
 import (
 	"fmt"
diff --git a/lib/fmtutil/fmt_test.go b/lib/fmtutil/fmt_test.go
index 0aaebb5..2c63c2e 100644
--- a/lib/fmtutil/fmt_test.go
+++ b/lib/fmtutil/fmt_test.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-package util_test
+package fmtutil_test
 
 import (
 	"fmt"
@@ -10,7 +10,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
-	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+	"git.lukeshu.com/btrfs-progs-ng/lib/fmtutil"
 )
 
 type FmtState struct {
@@ -94,10 +94,10 @@ func FuzzFmtStateString(f *testing.F) {
 		}
 		verb := rune(verbs[int(verbIdx)%len(verbs)])
 
-		t.Logf("(%#v, %c) => %q", input, verb, util.FmtStateString(input, verb))
+		t.Logf("(%#v, %c) => %q", input, verb, fmtutil.FmtStateString(input, verb))
 
 		var output FmtState
-		assert.Equal(t, "", fmt.Sprintf(util.FmtStateString(input, verb), &output))
+		assert.Equal(t, "", fmt.Sprintf(fmtutil.FmtStateString(input, verb), &output))
 		assert.Equal(t, input, output)
 	})
 }