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-rw-r--r--pkg/p9/p9.go1141
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diff --git a/pkg/p9/p9.go b/pkg/p9/p9.go
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+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package p9 is a 9P2000.L implementation.
+package p9
+
+import (
+ "fmt"
+ "math"
+ "os"
+ "strings"
+ "sync/atomic"
+ "syscall"
+
+ "golang.org/x/sys/unix"
+)
+
+// OpenFlags is the mode passed to Open and Create operations.
+//
+// These correspond to bits sent over the wire.
+type OpenFlags uint32
+
+const (
+ // ReadOnly is a Topen and Tcreate flag indicating read-only mode.
+ ReadOnly OpenFlags = 0
+
+ // WriteOnly is a Topen and Tcreate flag indicating write-only mode.
+ WriteOnly OpenFlags = 1
+
+ // ReadWrite is a Topen flag indicates read-write mode.
+ ReadWrite OpenFlags = 2
+
+ // OpenFlagsModeMask is a mask of valid OpenFlags mode bits.
+ OpenFlagsModeMask OpenFlags = 3
+
+ // OpenFlagsIgnoreMask is a list of OpenFlags mode bits that are ignored for Tlopen.
+ // Note that syscall.O_LARGEFILE is set to zero, use value from Linux fcntl.h.
+ OpenFlagsIgnoreMask OpenFlags = syscall.O_DIRECTORY | syscall.O_NOATIME | 0100000
+)
+
+// ConnectFlags is the mode passed to Connect operations.
+//
+// These correspond to bits sent over the wire.
+type ConnectFlags uint32
+
+const (
+ // StreamSocket is a Tlconnect flag indicating SOCK_STREAM mode.
+ StreamSocket ConnectFlags = 0
+
+ // DgramSocket is a Tlconnect flag indicating SOCK_DGRAM mode.
+ DgramSocket ConnectFlags = 1
+
+ // SeqpacketSocket is a Tlconnect flag indicating SOCK_SEQPACKET mode.
+ SeqpacketSocket ConnectFlags = 2
+
+ // AnonymousSocket is a Tlconnect flag indicating that the mode does not
+ // matter and that the requester will accept any socket type.
+ AnonymousSocket ConnectFlags = 3
+)
+
+// OSFlags converts a p9.OpenFlags to an int compatible with open(2).
+func (o OpenFlags) OSFlags() int {
+ return int(o & OpenFlagsModeMask)
+}
+
+// String implements fmt.Stringer.
+func (o OpenFlags) String() string {
+ switch o {
+ case ReadOnly:
+ return "ReadOnly"
+ case WriteOnly:
+ return "WriteOnly"
+ case ReadWrite:
+ return "ReadWrite"
+ case OpenFlagsModeMask:
+ return "OpenFlagsModeMask"
+ case OpenFlagsIgnoreMask:
+ return "OpenFlagsIgnoreMask"
+ default:
+ return "UNDEFINED"
+ }
+}
+
+// Tag is a messsage tag.
+type Tag uint16
+
+// FID is a file identifier.
+type FID uint64
+
+// FileMode are flags corresponding to file modes.
+//
+// These correspond to bits sent over the wire.
+// These also correspond to mode_t bits.
+type FileMode uint32
+
+const (
+ // FileModeMask is a mask of all the file mode bits of FileMode.
+ FileModeMask FileMode = 0170000
+
+ // ModeSocket is an (unused) mode bit for a socket.
+ ModeSocket FileMode = 0140000
+
+ // ModeSymlink is a mode bit for a symlink.
+ ModeSymlink FileMode = 0120000
+
+ // ModeRegular is a mode bit for regular files.
+ ModeRegular FileMode = 0100000
+
+ // ModeBlockDevice is a mode bit for block devices.
+ ModeBlockDevice FileMode = 060000
+
+ // ModeDirectory is a mode bit for directories.
+ ModeDirectory FileMode = 040000
+
+ // ModeCharacterDevice is a mode bit for a character device.
+ ModeCharacterDevice FileMode = 020000
+
+ // ModeNamedPipe is a mode bit for a named pipe.
+ ModeNamedPipe FileMode = 010000
+
+ // Read is a mode bit indicating read permission.
+ Read FileMode = 04
+
+ // Write is a mode bit indicating write permission.
+ Write FileMode = 02
+
+ // Exec is a mode bit indicating exec permission.
+ Exec FileMode = 01
+
+ // AllPermissions is a mask with rwx bits set for user, group and others.
+ AllPermissions FileMode = 0777
+
+ // Sticky is a mode bit indicating sticky directories.
+ Sticky FileMode = 01000
+
+ // permissionsMask is the mask to apply to FileModes for permissions. It
+ // includes rwx bits for user, group and others, and sticky bit.
+ permissionsMask FileMode = 01777
+)
+
+// QIDType is the most significant byte of the FileMode word, to be used as the
+// Type field of p9.QID.
+func (m FileMode) QIDType() QIDType {
+ switch {
+ case m.IsDir():
+ return TypeDir
+ case m.IsSocket(), m.IsNamedPipe(), m.IsCharacterDevice():
+ // Best approximation.
+ return TypeAppendOnly
+ case m.IsSymlink():
+ return TypeSymlink
+ default:
+ return TypeRegular
+ }
+}
+
+// FileType returns the file mode without the permission bits.
+func (m FileMode) FileType() FileMode {
+ return m & FileModeMask
+}
+
+// Permissions returns just the permission bits of the mode.
+func (m FileMode) Permissions() FileMode {
+ return m & permissionsMask
+}
+
+// Writable returns the mode with write bits added.
+func (m FileMode) Writable() FileMode {
+ return m | 0222
+}
+
+// IsReadable returns true if m represents a file that can be read.
+func (m FileMode) IsReadable() bool {
+ return m&0444 != 0
+}
+
+// IsWritable returns true if m represents a file that can be written to.
+func (m FileMode) IsWritable() bool {
+ return m&0222 != 0
+}
+
+// IsExecutable returns true if m represents a file that can be executed.
+func (m FileMode) IsExecutable() bool {
+ return m&0111 != 0
+}
+
+// IsRegular returns true if m is a regular file.
+func (m FileMode) IsRegular() bool {
+ return m&FileModeMask == ModeRegular
+}
+
+// IsDir returns true if m represents a directory.
+func (m FileMode) IsDir() bool {
+ return m&FileModeMask == ModeDirectory
+}
+
+// IsNamedPipe returns true if m represents a named pipe.
+func (m FileMode) IsNamedPipe() bool {
+ return m&FileModeMask == ModeNamedPipe
+}
+
+// IsCharacterDevice returns true if m represents a character device.
+func (m FileMode) IsCharacterDevice() bool {
+ return m&FileModeMask == ModeCharacterDevice
+}
+
+// IsBlockDevice returns true if m represents a character device.
+func (m FileMode) IsBlockDevice() bool {
+ return m&FileModeMask == ModeBlockDevice
+}
+
+// IsSocket returns true if m represents a socket.
+func (m FileMode) IsSocket() bool {
+ return m&FileModeMask == ModeSocket
+}
+
+// IsSymlink returns true if m represents a symlink.
+func (m FileMode) IsSymlink() bool {
+ return m&FileModeMask == ModeSymlink
+}
+
+// ModeFromOS returns a FileMode from an os.FileMode.
+func ModeFromOS(mode os.FileMode) FileMode {
+ m := FileMode(mode.Perm())
+ switch {
+ case mode.IsDir():
+ m |= ModeDirectory
+ case mode&os.ModeSymlink != 0:
+ m |= ModeSymlink
+ case mode&os.ModeSocket != 0:
+ m |= ModeSocket
+ case mode&os.ModeNamedPipe != 0:
+ m |= ModeNamedPipe
+ case mode&os.ModeCharDevice != 0:
+ m |= ModeCharacterDevice
+ case mode&os.ModeDevice != 0:
+ m |= ModeBlockDevice
+ default:
+ m |= ModeRegular
+ }
+ return m
+}
+
+// OSMode converts a p9.FileMode to an os.FileMode.
+func (m FileMode) OSMode() os.FileMode {
+ var osMode os.FileMode
+ osMode |= os.FileMode(m.Permissions())
+ switch {
+ case m.IsDir():
+ osMode |= os.ModeDir
+ case m.IsSymlink():
+ osMode |= os.ModeSymlink
+ case m.IsSocket():
+ osMode |= os.ModeSocket
+ case m.IsNamedPipe():
+ osMode |= os.ModeNamedPipe
+ case m.IsCharacterDevice():
+ osMode |= os.ModeCharDevice | os.ModeDevice
+ case m.IsBlockDevice():
+ osMode |= os.ModeDevice
+ }
+ return osMode
+}
+
+// UID represents a user ID.
+type UID uint32
+
+// Ok returns true if uid is not NoUID.
+func (uid UID) Ok() bool {
+ return uid != NoUID
+}
+
+// GID represents a group ID.
+type GID uint32
+
+// Ok returns true if gid is not NoGID.
+func (gid GID) Ok() bool {
+ return gid != NoGID
+}
+
+const (
+ // NoTag is a sentinel used to indicate no valid tag.
+ NoTag Tag = math.MaxUint16
+
+ // NoFID is a sentinel used to indicate no valid FID.
+ NoFID FID = math.MaxUint32
+
+ // NoUID is a sentinel used to indicate no valid UID.
+ NoUID UID = math.MaxUint32
+
+ // NoGID is a sentinel used to indicate no valid GID.
+ NoGID GID = math.MaxUint32
+)
+
+// MsgType is a type identifier.
+type MsgType uint8
+
+// MsgType declarations.
+const (
+ MsgTlerror MsgType = 6
+ MsgRlerror = 7
+ MsgTstatfs = 8
+ MsgRstatfs = 9
+ MsgTlopen = 12
+ MsgRlopen = 13
+ MsgTlcreate = 14
+ MsgRlcreate = 15
+ MsgTsymlink = 16
+ MsgRsymlink = 17
+ MsgTmknod = 18
+ MsgRmknod = 19
+ MsgTrename = 20
+ MsgRrename = 21
+ MsgTreadlink = 22
+ MsgRreadlink = 23
+ MsgTgetattr = 24
+ MsgRgetattr = 25
+ MsgTsetattr = 26
+ MsgRsetattr = 27
+ MsgTxattrwalk = 30
+ MsgRxattrwalk = 31
+ MsgTxattrcreate = 32
+ MsgRxattrcreate = 33
+ MsgTreaddir = 40
+ MsgRreaddir = 41
+ MsgTfsync = 50
+ MsgRfsync = 51
+ MsgTlink = 70
+ MsgRlink = 71
+ MsgTmkdir = 72
+ MsgRmkdir = 73
+ MsgTrenameat = 74
+ MsgRrenameat = 75
+ MsgTunlinkat = 76
+ MsgRunlinkat = 77
+ MsgTversion = 100
+ MsgRversion = 101
+ MsgTauth = 102
+ MsgRauth = 103
+ MsgTattach = 104
+ MsgRattach = 105
+ MsgTflush = 108
+ MsgRflush = 109
+ MsgTwalk = 110
+ MsgRwalk = 111
+ MsgTread = 116
+ MsgRread = 117
+ MsgTwrite = 118
+ MsgRwrite = 119
+ MsgTclunk = 120
+ MsgRclunk = 121
+ MsgTremove = 122
+ MsgRremove = 123
+ MsgTflushf = 124
+ MsgRflushf = 125
+ MsgTwalkgetattr = 126
+ MsgRwalkgetattr = 127
+ MsgTucreate = 128
+ MsgRucreate = 129
+ MsgTumkdir = 130
+ MsgRumkdir = 131
+ MsgTumknod = 132
+ MsgRumknod = 133
+ MsgTusymlink = 134
+ MsgRusymlink = 135
+ MsgTlconnect = 136
+ MsgRlconnect = 137
+ MsgTallocate = 138
+ MsgRallocate = 139
+)
+
+// QIDType represents the file type for QIDs.
+//
+// QIDType corresponds to the high 8 bits of a Plan 9 file mode.
+type QIDType uint8
+
+const (
+ // TypeDir represents a directory type.
+ TypeDir QIDType = 0x80
+
+ // TypeAppendOnly represents an append only file.
+ TypeAppendOnly QIDType = 0x40
+
+ // TypeExclusive represents an exclusive-use file.
+ TypeExclusive QIDType = 0x20
+
+ // TypeMount represents a mounted channel.
+ TypeMount QIDType = 0x10
+
+ // TypeAuth represents an authentication file.
+ TypeAuth QIDType = 0x08
+
+ // TypeTemporary represents a temporary file.
+ TypeTemporary QIDType = 0x04
+
+ // TypeSymlink represents a symlink.
+ TypeSymlink QIDType = 0x02
+
+ // TypeLink represents a hard link.
+ TypeLink QIDType = 0x01
+
+ // TypeRegular represents a regular file.
+ TypeRegular QIDType = 0x00
+)
+
+// QID is a unique file identifier.
+//
+// This may be embedded in other requests and responses.
+type QID struct {
+ // Type is the highest order byte of the file mode.
+ Type QIDType
+
+ // Version is an arbitrary server version number.
+ Version uint32
+
+ // Path is a unique server identifier for this path (e.g. inode).
+ Path uint64
+}
+
+// String implements fmt.Stringer.
+func (q QID) String() string {
+ return fmt.Sprintf("QID{Type: %d, Version: %d, Path: %d}", q.Type, q.Version, q.Path)
+}
+
+// Decode implements encoder.Decode.
+func (q *QID) Decode(b *buffer) {
+ q.Type = b.ReadQIDType()
+ q.Version = b.Read32()
+ q.Path = b.Read64()
+}
+
+// Encode implements encoder.Encode.
+func (q *QID) Encode(b *buffer) {
+ b.WriteQIDType(q.Type)
+ b.Write32(q.Version)
+ b.Write64(q.Path)
+}
+
+// QIDGenerator is a simple generator for QIDs that atomically increments Path
+// values.
+type QIDGenerator struct {
+ // uids is an ever increasing value that can be atomically incremented
+ // to provide unique Path values for QIDs.
+ uids uint64
+}
+
+// Get returns a new 9P unique ID with a unique Path given a QID type.
+//
+// While the 9P spec allows Version to be incremented every time the file is
+// modified, we currently do not use the Version member for anything. Hence,
+// it is set to 0.
+func (q *QIDGenerator) Get(t QIDType) QID {
+ return QID{
+ Type: t,
+ Version: 0,
+ Path: atomic.AddUint64(&q.uids, 1),
+ }
+}
+
+// FSStat is used by statfs.
+type FSStat struct {
+ // Type is the filesystem type.
+ Type uint32
+
+ // BlockSize is the blocksize.
+ BlockSize uint32
+
+ // Blocks is the number of blocks.
+ Blocks uint64
+
+ // BlocksFree is the number of free blocks.
+ BlocksFree uint64
+
+ // BlocksAvailable is the number of blocks *available*.
+ BlocksAvailable uint64
+
+ // Files is the number of files available.
+ Files uint64
+
+ // FilesFree is the number of free file nodes.
+ FilesFree uint64
+
+ // FSID is the filesystem ID.
+ FSID uint64
+
+ // NameLength is the maximum name length.
+ NameLength uint32
+}
+
+// Decode implements encoder.Decode.
+func (f *FSStat) Decode(b *buffer) {
+ f.Type = b.Read32()
+ f.BlockSize = b.Read32()
+ f.Blocks = b.Read64()
+ f.BlocksFree = b.Read64()
+ f.BlocksAvailable = b.Read64()
+ f.Files = b.Read64()
+ f.FilesFree = b.Read64()
+ f.FSID = b.Read64()
+ f.NameLength = b.Read32()
+}
+
+// Encode implements encoder.Encode.
+func (f *FSStat) Encode(b *buffer) {
+ b.Write32(f.Type)
+ b.Write32(f.BlockSize)
+ b.Write64(f.Blocks)
+ b.Write64(f.BlocksFree)
+ b.Write64(f.BlocksAvailable)
+ b.Write64(f.Files)
+ b.Write64(f.FilesFree)
+ b.Write64(f.FSID)
+ b.Write32(f.NameLength)
+}
+
+// AttrMask is a mask of attributes for getattr.
+type AttrMask struct {
+ Mode bool
+ NLink bool
+ UID bool
+ GID bool
+ RDev bool
+ ATime bool
+ MTime bool
+ CTime bool
+ INo bool
+ Size bool
+ Blocks bool
+ BTime bool
+ Gen bool
+ DataVersion bool
+}
+
+// Contains returns true if a contains all of the attributes masked as b.
+func (a AttrMask) Contains(b AttrMask) bool {
+ if b.Mode && !a.Mode {
+ return false
+ }
+ if b.NLink && !a.NLink {
+ return false
+ }
+ if b.UID && !a.UID {
+ return false
+ }
+ if b.GID && !a.GID {
+ return false
+ }
+ if b.RDev && !a.RDev {
+ return false
+ }
+ if b.ATime && !a.ATime {
+ return false
+ }
+ if b.MTime && !a.MTime {
+ return false
+ }
+ if b.CTime && !a.CTime {
+ return false
+ }
+ if b.INo && !a.INo {
+ return false
+ }
+ if b.Size && !a.Size {
+ return false
+ }
+ if b.Blocks && !a.Blocks {
+ return false
+ }
+ if b.BTime && !a.BTime {
+ return false
+ }
+ if b.Gen && !a.Gen {
+ return false
+ }
+ if b.DataVersion && !a.DataVersion {
+ return false
+ }
+ return true
+}
+
+// Empty returns true if no fields are masked.
+func (a AttrMask) Empty() bool {
+ return !a.Mode && !a.NLink && !a.UID && !a.GID && !a.RDev && !a.ATime && !a.MTime && !a.CTime && !a.INo && !a.Size && !a.Blocks && !a.BTime && !a.Gen && !a.DataVersion
+}
+
+// AttrMaskAll returns an AttrMask with all fields masked.
+func AttrMaskAll() AttrMask {
+ return AttrMask{
+ Mode: true,
+ NLink: true,
+ UID: true,
+ GID: true,
+ RDev: true,
+ ATime: true,
+ MTime: true,
+ CTime: true,
+ INo: true,
+ Size: true,
+ Blocks: true,
+ BTime: true,
+ Gen: true,
+ DataVersion: true,
+ }
+}
+
+// String implements fmt.Stringer.
+func (a AttrMask) String() string {
+ var masks []string
+ if a.Mode {
+ masks = append(masks, "Mode")
+ }
+ if a.NLink {
+ masks = append(masks, "NLink")
+ }
+ if a.UID {
+ masks = append(masks, "UID")
+ }
+ if a.GID {
+ masks = append(masks, "GID")
+ }
+ if a.RDev {
+ masks = append(masks, "RDev")
+ }
+ if a.ATime {
+ masks = append(masks, "ATime")
+ }
+ if a.MTime {
+ masks = append(masks, "MTime")
+ }
+ if a.CTime {
+ masks = append(masks, "CTime")
+ }
+ if a.INo {
+ masks = append(masks, "INo")
+ }
+ if a.Size {
+ masks = append(masks, "Size")
+ }
+ if a.Blocks {
+ masks = append(masks, "Blocks")
+ }
+ if a.BTime {
+ masks = append(masks, "BTime")
+ }
+ if a.Gen {
+ masks = append(masks, "Gen")
+ }
+ if a.DataVersion {
+ masks = append(masks, "DataVersion")
+ }
+ return fmt.Sprintf("AttrMask{with: %s}", strings.Join(masks, " "))
+}
+
+// Decode implements encoder.Decode.
+func (a *AttrMask) Decode(b *buffer) {
+ mask := b.Read64()
+ a.Mode = mask&0x00000001 != 0
+ a.NLink = mask&0x00000002 != 0
+ a.UID = mask&0x00000004 != 0
+ a.GID = mask&0x00000008 != 0
+ a.RDev = mask&0x00000010 != 0
+ a.ATime = mask&0x00000020 != 0
+ a.MTime = mask&0x00000040 != 0
+ a.CTime = mask&0x00000080 != 0
+ a.INo = mask&0x00000100 != 0
+ a.Size = mask&0x00000200 != 0
+ a.Blocks = mask&0x00000400 != 0
+ a.BTime = mask&0x00000800 != 0
+ a.Gen = mask&0x00001000 != 0
+ a.DataVersion = mask&0x00002000 != 0
+}
+
+// Encode implements encoder.Encode.
+func (a *AttrMask) Encode(b *buffer) {
+ var mask uint64
+ if a.Mode {
+ mask |= 0x00000001
+ }
+ if a.NLink {
+ mask |= 0x00000002
+ }
+ if a.UID {
+ mask |= 0x00000004
+ }
+ if a.GID {
+ mask |= 0x00000008
+ }
+ if a.RDev {
+ mask |= 0x00000010
+ }
+ if a.ATime {
+ mask |= 0x00000020
+ }
+ if a.MTime {
+ mask |= 0x00000040
+ }
+ if a.CTime {
+ mask |= 0x00000080
+ }
+ if a.INo {
+ mask |= 0x00000100
+ }
+ if a.Size {
+ mask |= 0x00000200
+ }
+ if a.Blocks {
+ mask |= 0x00000400
+ }
+ if a.BTime {
+ mask |= 0x00000800
+ }
+ if a.Gen {
+ mask |= 0x00001000
+ }
+ if a.DataVersion {
+ mask |= 0x00002000
+ }
+ b.Write64(mask)
+}
+
+// Attr is a set of attributes for getattr.
+type Attr struct {
+ Mode FileMode
+ UID UID
+ GID GID
+ NLink uint64
+ RDev uint64
+ Size uint64
+ BlockSize uint64
+ Blocks uint64
+ ATimeSeconds uint64
+ ATimeNanoSeconds uint64
+ MTimeSeconds uint64
+ MTimeNanoSeconds uint64
+ CTimeSeconds uint64
+ CTimeNanoSeconds uint64
+ BTimeSeconds uint64
+ BTimeNanoSeconds uint64
+ Gen uint64
+ DataVersion uint64
+}
+
+// String implements fmt.Stringer.
+func (a Attr) String() string {
+ return fmt.Sprintf("Attr{Mode: 0o%o, UID: %d, GID: %d, NLink: %d, RDev: %d, Size: %d, BlockSize: %d, Blocks: %d, ATime: {Sec: %d, NanoSec: %d}, MTime: {Sec: %d, NanoSec: %d}, CTime: {Sec: %d, NanoSec: %d}, BTime: {Sec: %d, NanoSec: %d}, Gen: %d, DataVersion: %d}",
+ a.Mode, a.UID, a.GID, a.NLink, a.RDev, a.Size, a.BlockSize, a.Blocks, a.ATimeSeconds, a.ATimeNanoSeconds, a.MTimeSeconds, a.MTimeNanoSeconds, a.CTimeSeconds, a.CTimeNanoSeconds, a.BTimeSeconds, a.BTimeNanoSeconds, a.Gen, a.DataVersion)
+}
+
+// Encode implements encoder.Encode.
+func (a *Attr) Encode(b *buffer) {
+ b.WriteFileMode(a.Mode)
+ b.WriteUID(a.UID)
+ b.WriteGID(a.GID)
+ b.Write64(a.NLink)
+ b.Write64(a.RDev)
+ b.Write64(a.Size)
+ b.Write64(a.BlockSize)
+ b.Write64(a.Blocks)
+ b.Write64(a.ATimeSeconds)
+ b.Write64(a.ATimeNanoSeconds)
+ b.Write64(a.MTimeSeconds)
+ b.Write64(a.MTimeNanoSeconds)
+ b.Write64(a.CTimeSeconds)
+ b.Write64(a.CTimeNanoSeconds)
+ b.Write64(a.BTimeSeconds)
+ b.Write64(a.BTimeNanoSeconds)
+ b.Write64(a.Gen)
+ b.Write64(a.DataVersion)
+}
+
+// Decode implements encoder.Decode.
+func (a *Attr) Decode(b *buffer) {
+ a.Mode = b.ReadFileMode()
+ a.UID = b.ReadUID()
+ a.GID = b.ReadGID()
+ a.NLink = b.Read64()
+ a.RDev = b.Read64()
+ a.Size = b.Read64()
+ a.BlockSize = b.Read64()
+ a.Blocks = b.Read64()
+ a.ATimeSeconds = b.Read64()
+ a.ATimeNanoSeconds = b.Read64()
+ a.MTimeSeconds = b.Read64()
+ a.MTimeNanoSeconds = b.Read64()
+ a.CTimeSeconds = b.Read64()
+ a.CTimeNanoSeconds = b.Read64()
+ a.BTimeSeconds = b.Read64()
+ a.BTimeNanoSeconds = b.Read64()
+ a.Gen = b.Read64()
+ a.DataVersion = b.Read64()
+}
+
+// StatToAttr converts a Linux syscall stat structure to an Attr.
+func StatToAttr(s *syscall.Stat_t, req AttrMask) (Attr, AttrMask) {
+ attr := Attr{
+ UID: NoUID,
+ GID: NoGID,
+ }
+ if req.Mode {
+ // p9.FileMode corresponds to Linux mode_t.
+ attr.Mode = FileMode(s.Mode)
+ }
+ if req.NLink {
+ attr.NLink = s.Nlink
+ }
+ if req.UID {
+ attr.UID = UID(s.Uid)
+ }
+ if req.GID {
+ attr.GID = GID(s.Gid)
+ }
+ if req.RDev {
+ attr.RDev = s.Dev
+ }
+ if req.ATime {
+ attr.ATimeSeconds = uint64(s.Atim.Sec)
+ attr.ATimeNanoSeconds = uint64(s.Atim.Nsec)
+ }
+ if req.MTime {
+ attr.MTimeSeconds = uint64(s.Mtim.Sec)
+ attr.MTimeNanoSeconds = uint64(s.Mtim.Nsec)
+ }
+ if req.CTime {
+ attr.CTimeSeconds = uint64(s.Ctim.Sec)
+ attr.CTimeNanoSeconds = uint64(s.Ctim.Nsec)
+ }
+ if req.Size {
+ attr.Size = uint64(s.Size)
+ }
+ if req.Blocks {
+ attr.BlockSize = uint64(s.Blksize)
+ attr.Blocks = uint64(s.Blocks)
+ }
+
+ // Use the req field because we already have it.
+ req.BTime = false
+ req.Gen = false
+ req.DataVersion = false
+
+ return attr, req
+}
+
+// SetAttrMask specifies a valid mask for setattr.
+type SetAttrMask struct {
+ Permissions bool
+ UID bool
+ GID bool
+ Size bool
+ ATime bool
+ MTime bool
+ CTime bool
+ ATimeNotSystemTime bool
+ MTimeNotSystemTime bool
+}
+
+// IsSubsetOf returns whether s is a subset of m.
+func (s SetAttrMask) IsSubsetOf(m SetAttrMask) bool {
+ sb := s.bitmask()
+ sm := m.bitmask()
+ return sm|sb == sm
+}
+
+// String implements fmt.Stringer.
+func (s SetAttrMask) String() string {
+ var masks []string
+ if s.Permissions {
+ masks = append(masks, "Permissions")
+ }
+ if s.UID {
+ masks = append(masks, "UID")
+ }
+ if s.GID {
+ masks = append(masks, "GID")
+ }
+ if s.Size {
+ masks = append(masks, "Size")
+ }
+ if s.ATime {
+ masks = append(masks, "ATime")
+ }
+ if s.MTime {
+ masks = append(masks, "MTime")
+ }
+ if s.CTime {
+ masks = append(masks, "CTime")
+ }
+ if s.ATimeNotSystemTime {
+ masks = append(masks, "ATimeNotSystemTime")
+ }
+ if s.MTimeNotSystemTime {
+ masks = append(masks, "MTimeNotSystemTime")
+ }
+ return fmt.Sprintf("SetAttrMask{with: %s}", strings.Join(masks, " "))
+}
+
+// Empty returns true if no fields are masked.
+func (s SetAttrMask) Empty() bool {
+ return !s.Permissions && !s.UID && !s.GID && !s.Size && !s.ATime && !s.MTime && !s.CTime && !s.ATimeNotSystemTime && !s.MTimeNotSystemTime
+}
+
+// Decode implements encoder.Decode.
+func (s *SetAttrMask) Decode(b *buffer) {
+ mask := b.Read32()
+ s.Permissions = mask&0x00000001 != 0
+ s.UID = mask&0x00000002 != 0
+ s.GID = mask&0x00000004 != 0
+ s.Size = mask&0x00000008 != 0
+ s.ATime = mask&0x00000010 != 0
+ s.MTime = mask&0x00000020 != 0
+ s.CTime = mask&0x00000040 != 0
+ s.ATimeNotSystemTime = mask&0x00000080 != 0
+ s.MTimeNotSystemTime = mask&0x00000100 != 0
+}
+
+func (s SetAttrMask) bitmask() uint32 {
+ var mask uint32
+ if s.Permissions {
+ mask |= 0x00000001
+ }
+ if s.UID {
+ mask |= 0x00000002
+ }
+ if s.GID {
+ mask |= 0x00000004
+ }
+ if s.Size {
+ mask |= 0x00000008
+ }
+ if s.ATime {
+ mask |= 0x00000010
+ }
+ if s.MTime {
+ mask |= 0x00000020
+ }
+ if s.CTime {
+ mask |= 0x00000040
+ }
+ if s.ATimeNotSystemTime {
+ mask |= 0x00000080
+ }
+ if s.MTimeNotSystemTime {
+ mask |= 0x00000100
+ }
+ return mask
+}
+
+// Encode implements encoder.Encode.
+func (s *SetAttrMask) Encode(b *buffer) {
+ b.Write32(s.bitmask())
+}
+
+// SetAttr specifies a set of attributes for a setattr.
+type SetAttr struct {
+ Permissions FileMode
+ UID UID
+ GID GID
+ Size uint64
+ ATimeSeconds uint64
+ ATimeNanoSeconds uint64
+ MTimeSeconds uint64
+ MTimeNanoSeconds uint64
+}
+
+// String implements fmt.Stringer.
+func (s SetAttr) String() string {
+ return fmt.Sprintf("SetAttr{Permissions: 0o%o, UID: %d, GID: %d, Size: %d, ATime: {Sec: %d, NanoSec: %d}, MTime: {Sec: %d, NanoSec: %d}}", s.Permissions, s.UID, s.GID, s.Size, s.ATimeSeconds, s.ATimeNanoSeconds, s.MTimeSeconds, s.MTimeNanoSeconds)
+}
+
+// Decode implements encoder.Decode.
+func (s *SetAttr) Decode(b *buffer) {
+ s.Permissions = b.ReadPermissions()
+ s.UID = b.ReadUID()
+ s.GID = b.ReadGID()
+ s.Size = b.Read64()
+ s.ATimeSeconds = b.Read64()
+ s.ATimeNanoSeconds = b.Read64()
+ s.MTimeSeconds = b.Read64()
+ s.MTimeNanoSeconds = b.Read64()
+}
+
+// Encode implements encoder.Encode.
+func (s *SetAttr) Encode(b *buffer) {
+ b.WritePermissions(s.Permissions)
+ b.WriteUID(s.UID)
+ b.WriteGID(s.GID)
+ b.Write64(s.Size)
+ b.Write64(s.ATimeSeconds)
+ b.Write64(s.ATimeNanoSeconds)
+ b.Write64(s.MTimeSeconds)
+ b.Write64(s.MTimeNanoSeconds)
+}
+
+// Apply applies this to the given Attr.
+func (a *Attr) Apply(mask SetAttrMask, attr SetAttr) {
+ if mask.Permissions {
+ a.Mode = a.Mode&^permissionsMask | (attr.Permissions & permissionsMask)
+ }
+ if mask.UID {
+ a.UID = attr.UID
+ }
+ if mask.GID {
+ a.GID = attr.GID
+ }
+ if mask.Size {
+ a.Size = attr.Size
+ }
+ if mask.ATime {
+ a.ATimeSeconds = attr.ATimeSeconds
+ a.ATimeNanoSeconds = attr.ATimeNanoSeconds
+ }
+ if mask.MTime {
+ a.MTimeSeconds = attr.MTimeSeconds
+ a.MTimeNanoSeconds = attr.MTimeNanoSeconds
+ }
+}
+
+// Dirent is used for readdir.
+type Dirent struct {
+ // QID is the entry QID.
+ QID QID
+
+ // Offset is the offset in the directory.
+ //
+ // This will be communicated back the original caller.
+ Offset uint64
+
+ // Type is the 9P type.
+ Type QIDType
+
+ // Name is the name of the entry (i.e. basename).
+ Name string
+}
+
+// String implements fmt.Stringer.
+func (d Dirent) String() string {
+ return fmt.Sprintf("Dirent{QID: %d, Offset: %d, Type: 0x%X, Name: %s}", d.QID, d.Offset, d.Type, d.Name)
+}
+
+// Decode implements encoder.Decode.
+func (d *Dirent) Decode(b *buffer) {
+ d.QID.Decode(b)
+ d.Offset = b.Read64()
+ d.Type = b.ReadQIDType()
+ d.Name = b.ReadString()
+}
+
+// Encode implements encoder.Encode.
+func (d *Dirent) Encode(b *buffer) {
+ d.QID.Encode(b)
+ b.Write64(d.Offset)
+ b.WriteQIDType(d.Type)
+ b.WriteString(d.Name)
+}
+
+// AllocateMode are possible modes to p9.File.Allocate().
+type AllocateMode struct {
+ KeepSize bool
+ PunchHole bool
+ NoHideStale bool
+ CollapseRange bool
+ ZeroRange bool
+ InsertRange bool
+ Unshare bool
+}
+
+// ToLinux converts to a value compatible with fallocate(2)'s mode.
+func (a *AllocateMode) ToLinux() uint32 {
+ rv := uint32(0)
+ if a.KeepSize {
+ rv |= unix.FALLOC_FL_KEEP_SIZE
+ }
+ if a.PunchHole {
+ rv |= unix.FALLOC_FL_PUNCH_HOLE
+ }
+ if a.NoHideStale {
+ rv |= unix.FALLOC_FL_NO_HIDE_STALE
+ }
+ if a.CollapseRange {
+ rv |= unix.FALLOC_FL_COLLAPSE_RANGE
+ }
+ if a.ZeroRange {
+ rv |= unix.FALLOC_FL_ZERO_RANGE
+ }
+ if a.InsertRange {
+ rv |= unix.FALLOC_FL_INSERT_RANGE
+ }
+ if a.Unshare {
+ rv |= unix.FALLOC_FL_UNSHARE_RANGE
+ }
+ return rv
+}
+
+// Decode implements encoder.Decode.
+func (a *AllocateMode) Decode(b *buffer) {
+ mask := b.Read32()
+ a.KeepSize = mask&0x01 != 0
+ a.PunchHole = mask&0x02 != 0
+ a.NoHideStale = mask&0x04 != 0
+ a.CollapseRange = mask&0x08 != 0
+ a.ZeroRange = mask&0x10 != 0
+ a.InsertRange = mask&0x20 != 0
+ a.Unshare = mask&0x40 != 0
+}
+
+// Encode implements encoder.Encode.
+func (a *AllocateMode) Encode(b *buffer) {
+ mask := uint32(0)
+ if a.KeepSize {
+ mask |= 0x01
+ }
+ if a.PunchHole {
+ mask |= 0x02
+ }
+ if a.NoHideStale {
+ mask |= 0x04
+ }
+ if a.CollapseRange {
+ mask |= 0x08
+ }
+ if a.ZeroRange {
+ mask |= 0x10
+ }
+ if a.InsertRange {
+ mask |= 0x20
+ }
+ if a.Unshare {
+ mask |= 0x40
+ }
+ b.Write32(mask)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 14:33:29 +0000