swarm/api: support mounting manifests via FUSE (#3690)

1 files changed, 774 insertions, 0 deletions

diff --git a/vendor/bazil.org/fuse/fuse_kernel.go b/vendor/bazil.org/fuse/fuse_kernel.go
new file mode 100644
index 000000000..87c5ca1dc
--- /dev/null
+++ b/vendor/bazil.org/fuse/fuse_kernel.go
@@ -0,0 +1,774 @@
+// See the file LICENSE for copyright and licensing information.
+
+// Derived from FUSE's fuse_kernel.h, which carries this notice:
+/*
+   This file defines the kernel interface of FUSE
+   Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
+
+
+   This -- and only this -- header file may also be distributed under
+   the terms of the BSD Licence as follows:
+
+   Copyright (C) 2001-2007 Miklos Szeredi. All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+   THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+   SUCH DAMAGE.
+*/
+
+package fuse
+
+import (
+	"fmt"
+	"syscall"
+	"unsafe"
+)
+
+// The FUSE version implemented by the package.
+const (
+	protoVersionMinMajor = 7
+	protoVersionMinMinor = 8
+	protoVersionMaxMajor = 7
+	protoVersionMaxMinor = 12
+)
+
+const (
+	rootID = 1
+)
+
+type kstatfs struct {
+	Blocks  uint64
+	Bfree   uint64
+	Bavail  uint64
+	Files   uint64
+	Ffree   uint64
+	Bsize   uint32
+	Namelen uint32
+	Frsize  uint32
+	_       uint32
+	Spare   [6]uint32
+}
+
+type fileLock struct {
+	Start uint64
+	End   uint64
+	Type  uint32
+	Pid   uint32
+}
+
+// GetattrFlags are bit flags that can be seen in GetattrRequest.
+type GetattrFlags uint32
+
+const (
+	// Indicates the handle is valid.
+	GetattrFh GetattrFlags = 1 << 0
+)
+
+var getattrFlagsNames = []flagName{
+	{uint32(GetattrFh), "GetattrFh"},
+}
+
+func (fl GetattrFlags) String() string {
+	return flagString(uint32(fl), getattrFlagsNames)
+}
+
+// The SetattrValid are bit flags describing which fields in the SetattrRequest
+// are included in the change.
+type SetattrValid uint32
+
+const (
+	SetattrMode   SetattrValid = 1 << 0
+	SetattrUid    SetattrValid = 1 << 1
+	SetattrGid    SetattrValid = 1 << 2
+	SetattrSize   SetattrValid = 1 << 3
+	SetattrAtime  SetattrValid = 1 << 4
+	SetattrMtime  SetattrValid = 1 << 5
+	SetattrHandle SetattrValid = 1 << 6
+
+	// Linux only(?)
+	SetattrAtimeNow  SetattrValid = 1 << 7
+	SetattrMtimeNow  SetattrValid = 1 << 8
+	SetattrLockOwner SetattrValid = 1 << 9 // http://www.mail-archive.com/git-commits-head@vger.kernel.org/msg27852.html
+
+	// OS X only
+	SetattrCrtime   SetattrValid = 1 << 28
+	SetattrChgtime  SetattrValid = 1 << 29
+	SetattrBkuptime SetattrValid = 1 << 30
+	SetattrFlags    SetattrValid = 1 << 31
+)
+
+func (fl SetattrValid) Mode() bool      { return fl&SetattrMode != 0 }
+func (fl SetattrValid) Uid() bool       { return fl&SetattrUid != 0 }
+func (fl SetattrValid) Gid() bool       { return fl&SetattrGid != 0 }
+func (fl SetattrValid) Size() bool      { return fl&SetattrSize != 0 }
+func (fl SetattrValid) Atime() bool     { return fl&SetattrAtime != 0 }
+func (fl SetattrValid) Mtime() bool     { return fl&SetattrMtime != 0 }
+func (fl SetattrValid) Handle() bool    { return fl&SetattrHandle != 0 }
+func (fl SetattrValid) AtimeNow() bool  { return fl&SetattrAtimeNow != 0 }
+func (fl SetattrValid) MtimeNow() bool  { return fl&SetattrMtimeNow != 0 }
+func (fl SetattrValid) LockOwner() bool { return fl&SetattrLockOwner != 0 }
+func (fl SetattrValid) Crtime() bool    { return fl&SetattrCrtime != 0 }
+func (fl SetattrValid) Chgtime() bool   { return fl&SetattrChgtime != 0 }
+func (fl SetattrValid) Bkuptime() bool  { return fl&SetattrBkuptime != 0 }
+func (fl SetattrValid) Flags() bool     { return fl&SetattrFlags != 0 }
+
+func (fl SetattrValid) String() string {
+	return flagString(uint32(fl), setattrValidNames)
+}
+
+var setattrValidNames = []flagName{
+	{uint32(SetattrMode), "SetattrMode"},
+	{uint32(SetattrUid), "SetattrUid"},
+	{uint32(SetattrGid), "SetattrGid"},
+	{uint32(SetattrSize), "SetattrSize"},
+	{uint32(SetattrAtime), "SetattrAtime"},
+	{uint32(SetattrMtime), "SetattrMtime"},
+	{uint32(SetattrHandle), "SetattrHandle"},
+	{uint32(SetattrAtimeNow), "SetattrAtimeNow"},
+	{uint32(SetattrMtimeNow), "SetattrMtimeNow"},
+	{uint32(SetattrLockOwner), "SetattrLockOwner"},
+	{uint32(SetattrCrtime), "SetattrCrtime"},
+	{uint32(SetattrChgtime), "SetattrChgtime"},
+	{uint32(SetattrBkuptime), "SetattrBkuptime"},
+	{uint32(SetattrFlags), "SetattrFlags"},
+}
+
+// Flags that can be seen in OpenRequest.Flags.
+const (
+	// Access modes. These are not 1-bit flags, but alternatives where
+	// only one can be chosen. See the IsReadOnly etc convenience
+	// methods.
+	OpenReadOnly  OpenFlags = syscall.O_RDONLY
+	OpenWriteOnly OpenFlags = syscall.O_WRONLY
+	OpenReadWrite OpenFlags = syscall.O_RDWR
+
+	// File was opened in append-only mode, all writes will go to end
+	// of file. OS X does not provide this information.
+	OpenAppend    OpenFlags = syscall.O_APPEND
+	OpenCreate    OpenFlags = syscall.O_CREAT
+	OpenDirectory OpenFlags = syscall.O_DIRECTORY
+	OpenExclusive OpenFlags = syscall.O_EXCL
+	OpenNonblock  OpenFlags = syscall.O_NONBLOCK
+	OpenSync      OpenFlags = syscall.O_SYNC
+	OpenTruncate  OpenFlags = syscall.O_TRUNC
+)
+
+// OpenAccessModeMask is a bitmask that separates the access mode
+// from the other flags in OpenFlags.
+const OpenAccessModeMask OpenFlags = syscall.O_ACCMODE
+
+// OpenFlags are the O_FOO flags passed to open/create/etc calls. For
+// example, os.O_WRONLY | os.O_APPEND.
+type OpenFlags uint32
+
+func (fl OpenFlags) String() string {
+	// O_RDONLY, O_RWONLY, O_RDWR are not flags
+	s := accModeName(fl & OpenAccessModeMask)
+	flags := uint32(fl &^ OpenAccessModeMask)
+	if flags != 0 {
+		s = s + "+" + flagString(flags, openFlagNames)
+	}
+	return s
+}
+
+// Return true if OpenReadOnly is set.
+func (fl OpenFlags) IsReadOnly() bool {
+	return fl&OpenAccessModeMask == OpenReadOnly
+}
+
+// Return true if OpenWriteOnly is set.
+func (fl OpenFlags) IsWriteOnly() bool {
+	return fl&OpenAccessModeMask == OpenWriteOnly
+}
+
+// Return true if OpenReadWrite is set.
+func (fl OpenFlags) IsReadWrite() bool {
+	return fl&OpenAccessModeMask == OpenReadWrite
+}
+
+func accModeName(flags OpenFlags) string {
+	switch flags {
+	case OpenReadOnly:
+		return "OpenReadOnly"
+	case OpenWriteOnly:
+		return "OpenWriteOnly"
+	case OpenReadWrite:
+		return "OpenReadWrite"
+	default:
+		return ""
+	}
+}
+
+var openFlagNames = []flagName{
+	{uint32(OpenAppend), "OpenAppend"},
+	{uint32(OpenCreate), "OpenCreate"},
+	{uint32(OpenDirectory), "OpenDirectory"},
+	{uint32(OpenExclusive), "OpenExclusive"},
+	{uint32(OpenNonblock), "OpenNonblock"},
+	{uint32(OpenSync), "OpenSync"},
+	{uint32(OpenTruncate), "OpenTruncate"},
+}
+
+// The OpenResponseFlags are returned in the OpenResponse.
+type OpenResponseFlags uint32
+
+const (
+	OpenDirectIO    OpenResponseFlags = 1 << 0 // bypass page cache for this open file
+	OpenKeepCache   OpenResponseFlags = 1 << 1 // don't invalidate the data cache on open
+	OpenNonSeekable OpenResponseFlags = 1 << 2 // mark the file as non-seekable (not supported on OS X)
+
+	OpenPurgeAttr OpenResponseFlags = 1 << 30 // OS X
+	OpenPurgeUBC  OpenResponseFlags = 1 << 31 // OS X
+)
+
+func (fl OpenResponseFlags) String() string {
+	return flagString(uint32(fl), openResponseFlagNames)
+}
+
+var openResponseFlagNames = []flagName{
+	{uint32(OpenDirectIO), "OpenDirectIO"},
+	{uint32(OpenKeepCache), "OpenKeepCache"},
+	{uint32(OpenNonSeekable), "OpenNonSeekable"},
+	{uint32(OpenPurgeAttr), "OpenPurgeAttr"},
+	{uint32(OpenPurgeUBC), "OpenPurgeUBC"},
+}
+
+// The InitFlags are used in the Init exchange.
+type InitFlags uint32
+
+const (
+	InitAsyncRead     InitFlags = 1 << 0
+	InitPosixLocks    InitFlags = 1 << 1
+	InitFileOps       InitFlags = 1 << 2
+	InitAtomicTrunc   InitFlags = 1 << 3
+	InitExportSupport InitFlags = 1 << 4
+	InitBigWrites     InitFlags = 1 << 5
+	// Do not mask file access modes with umask. Not supported on OS X.
+	InitDontMask        InitFlags = 1 << 6
+	InitSpliceWrite     InitFlags = 1 << 7
+	InitSpliceMove      InitFlags = 1 << 8
+	InitSpliceRead      InitFlags = 1 << 9
+	InitFlockLocks      InitFlags = 1 << 10
+	InitHasIoctlDir     InitFlags = 1 << 11
+	InitAutoInvalData   InitFlags = 1 << 12
+	InitDoReaddirplus   InitFlags = 1 << 13
+	InitReaddirplusAuto InitFlags = 1 << 14
+	InitAsyncDIO        InitFlags = 1 << 15
+	InitWritebackCache  InitFlags = 1 << 16
+	InitNoOpenSupport   InitFlags = 1 << 17
+
+	InitCaseSensitive InitFlags = 1 << 29 // OS X only
+	InitVolRename     InitFlags = 1 << 30 // OS X only
+	InitXtimes        InitFlags = 1 << 31 // OS X only
+)
+
+type flagName struct {
+	bit  uint32
+	name string
+}
+
+var initFlagNames = []flagName{
+	{uint32(InitAsyncRead), "InitAsyncRead"},
+	{uint32(InitPosixLocks), "InitPosixLocks"},
+	{uint32(InitFileOps), "InitFileOps"},
+	{uint32(InitAtomicTrunc), "InitAtomicTrunc"},
+	{uint32(InitExportSupport), "InitExportSupport"},
+	{uint32(InitBigWrites), "InitBigWrites"},
+	{uint32(InitDontMask), "InitDontMask"},
+	{uint32(InitSpliceWrite), "InitSpliceWrite"},
+	{uint32(InitSpliceMove), "InitSpliceMove"},
+	{uint32(InitSpliceRead), "InitSpliceRead"},
+	{uint32(InitFlockLocks), "InitFlockLocks"},
+	{uint32(InitHasIoctlDir), "InitHasIoctlDir"},
+	{uint32(InitAutoInvalData), "InitAutoInvalData"},
+	{uint32(InitDoReaddirplus), "InitDoReaddirplus"},
+	{uint32(InitReaddirplusAuto), "InitReaddirplusAuto"},
+	{uint32(InitAsyncDIO), "InitAsyncDIO"},
+	{uint32(InitWritebackCache), "InitWritebackCache"},
+	{uint32(InitNoOpenSupport), "InitNoOpenSupport"},
+
+	{uint32(InitCaseSensitive), "InitCaseSensitive"},
+	{uint32(InitVolRename), "InitVolRename"},
+	{uint32(InitXtimes), "InitXtimes"},
+}
+
+func (fl InitFlags) String() string {
+	return flagString(uint32(fl), initFlagNames)
+}
+
+func flagString(f uint32, names []flagName) string {
+	var s string
+
+	if f == 0 {
+		return "0"
+	}
+
+	for _, n := range names {
+		if f&n.bit != 0 {
+			s += "+" + n.name
+			f &^= n.bit
+		}
+	}
+	if f != 0 {
+		s += fmt.Sprintf("%+#x", f)
+	}
+	return s[1:]
+}
+
+// The ReleaseFlags are used in the Release exchange.
+type ReleaseFlags uint32
+
+const (
+	ReleaseFlush ReleaseFlags = 1 << 0
+)
+
+func (fl ReleaseFlags) String() string {
+	return flagString(uint32(fl), releaseFlagNames)
+}
+
+var releaseFlagNames = []flagName{
+	{uint32(ReleaseFlush), "ReleaseFlush"},
+}
+
+// Opcodes
+const (
+	opLookup      = 1
+	opForget      = 2 // no reply
+	opGetattr     = 3
+	opSetattr     = 4
+	opReadlink    = 5
+	opSymlink     = 6
+	opMknod       = 8
+	opMkdir       = 9
+	opUnlink      = 10
+	opRmdir       = 11
+	opRename      = 12
+	opLink        = 13
+	opOpen        = 14
+	opRead        = 15
+	opWrite       = 16
+	opStatfs      = 17
+	opRelease     = 18
+	opFsync       = 20
+	opSetxattr    = 21
+	opGetxattr    = 22
+	opListxattr   = 23
+	opRemovexattr = 24
+	opFlush       = 25
+	opInit        = 26
+	opOpendir     = 27
+	opReaddir     = 28
+	opReleasedir  = 29
+	opFsyncdir    = 30
+	opGetlk       = 31
+	opSetlk       = 32
+	opSetlkw      = 33
+	opAccess      = 34
+	opCreate      = 35
+	opInterrupt   = 36
+	opBmap        = 37
+	opDestroy     = 38
+	opIoctl       = 39 // Linux?
+	opPoll        = 40 // Linux?
+
+	// OS X
+	opSetvolname = 61
+	opGetxtimes  = 62
+	opExchange   = 63
+)
+
+type entryOut struct {
+	Nodeid         uint64 // Inode ID
+	Generation     uint64 // Inode generation
+	EntryValid     uint64 // Cache timeout for the name
+	AttrValid      uint64 // Cache timeout for the attributes
+	EntryValidNsec uint32
+	AttrValidNsec  uint32
+	Attr           attr
+}
+
+func entryOutSize(p Protocol) uintptr {
+	switch {
+	case p.LT(Protocol{7, 9}):
+		return unsafe.Offsetof(entryOut{}.Attr) + unsafe.Offsetof(entryOut{}.Attr.Blksize)
+	default:
+		return unsafe.Sizeof(entryOut{})
+	}
+}
+
+type forgetIn struct {
+	Nlookup uint64
+}
+
+type getattrIn struct {
+	GetattrFlags uint32
+	_            uint32
+	Fh           uint64
+}
+
+type attrOut struct {
+	AttrValid     uint64 // Cache timeout for the attributes
+	AttrValidNsec uint32
+	_             uint32
+	Attr          attr
+}
+
+func attrOutSize(p Protocol) uintptr {
+	switch {
+	case p.LT(Protocol{7, 9}):
+		return unsafe.Offsetof(attrOut{}.Attr) + unsafe.Offsetof(attrOut{}.Attr.Blksize)
+	default:
+		return unsafe.Sizeof(attrOut{})
+	}
+}
+
+// OS X
+type getxtimesOut struct {
+	Bkuptime     uint64
+	Crtime       uint64
+	BkuptimeNsec uint32
+	CrtimeNsec   uint32
+}
+
+type mknodIn struct {
+	Mode  uint32
+	Rdev  uint32
+	Umask uint32
+	_     uint32
+	// "filename\x00" follows.
+}
+
+func mknodInSize(p Protocol) uintptr {
+	switch {
+	case p.LT(Protocol{7, 12}):
+		return unsafe.Offsetof(mknodIn{}.Umask)
+	default:
+		return unsafe.Sizeof(mknodIn{})
+	}
+}
+
+type mkdirIn struct {
+	Mode  uint32
+	Umask uint32
+	// filename follows
+}
+
+func mkdirInSize(p Protocol) uintptr {
+	switch {
+	case p.LT(Protocol{7, 12}):
+		return unsafe.Offsetof(mkdirIn{}.Umask) + 4
+	default:
+		return unsafe.Sizeof(mkdirIn{})
+	}
+}
+
+type renameIn struct {
+	Newdir uint64
+	// "oldname\x00newname\x00" follows
+}
+
+// OS X
+type exchangeIn struct {
+	Olddir  uint64
+	Newdir  uint64
+	Options uint64
+	// "oldname\x00newname\x00" follows
+}
+
+type linkIn struct {
+	Oldnodeid uint64
+}
+
+type setattrInCommon struct {
+	Valid     uint32
+	_         uint32
+	Fh        uint64
+	Size      uint64
+	LockOwner uint64 // unused on OS X?
+	Atime     uint64
+	Mtime     uint64
+	Unused2   uint64
+	AtimeNsec uint32
+	MtimeNsec uint32
+	Unused3   uint32
+	Mode      uint32
+	Unused4   uint32
+	Uid       uint32
+	Gid       uint32
+	Unused5   uint32
+}
+
+type openIn struct {
+	Flags  uint32
+	Unused uint32
+}
+
+type openOut struct {
+	Fh        uint64
+	OpenFlags uint32
+	_         uint32
+}
+
+type createIn struct {
+	Flags uint32
+	Mode  uint32
+	Umask uint32
+	_     uint32
+}
+
+func createInSize(p Protocol) uintptr {
+	switch {
+	case p.LT(Protocol{7, 12}):
+		return unsafe.Offsetof(createIn{}.Umask)
+	default:
+		return unsafe.Sizeof(createIn{})
+	}
+}
+
+type releaseIn struct {
+	Fh           uint64
+	Flags        uint32
+	ReleaseFlags uint32
+	LockOwner    uint32
+}
+
+type flushIn struct {
+	Fh         uint64
+	FlushFlags uint32
+	_          uint32
+	LockOwner  uint64
+}
+
+type readIn struct {
+	Fh        uint64
+	Offset    uint64
+	Size      uint32
+	ReadFlags uint32
+	LockOwner uint64
+	Flags     uint32
+	_         uint32
+}
+
+func readInSize(p Protocol) uintptr {
+	switch {
+	case p.LT(Protocol{7, 9}):
+		return unsafe.Offsetof(readIn{}.ReadFlags) + 4
+	default:
+		return unsafe.Sizeof(readIn{})
+	}
+}
+
+// The ReadFlags are passed in ReadRequest.
+type ReadFlags uint32
+
+const (
+	// LockOwner field is valid.
+	ReadLockOwner ReadFlags = 1 << 1
+)
+
+var readFlagNames = []flagName{
+	{uint32(ReadLockOwner), "ReadLockOwner"},
+}
+
+func (fl ReadFlags) String() string {
+	return flagString(uint32(fl), readFlagNames)
+}
+
+type writeIn struct {
+	Fh         uint64
+	Offset     uint64
+	Size       uint32
+	WriteFlags uint32
+	LockOwner  uint64
+	Flags      uint32
+	_          uint32
+}
+
+func writeInSize(p Protocol) uintptr {
+	switch {
+	case p.LT(Protocol{7, 9}):
+		return unsafe.Offsetof(writeIn{}.LockOwner)
+	default:
+		return unsafe.Sizeof(writeIn{})
+	}
+}
+
+type writeOut struct {
+	Size uint32
+	_    uint32
+}
+
+// The WriteFlags are passed in WriteRequest.
+type WriteFlags uint32
+
+const (
+	WriteCache WriteFlags = 1 << 0
+	// LockOwner field is valid.
+	WriteLockOwner WriteFlags = 1 << 1
+)
+
+var writeFlagNames = []flagName{
+	{uint32(WriteCache), "WriteCache"},
+	{uint32(WriteLockOwner), "WriteLockOwner"},
+}
+
+func (fl WriteFlags) String() string {
+	return flagString(uint32(fl), writeFlagNames)
+}
+
+const compatStatfsSize = 48
+
+type statfsOut struct {
+	St kstatfs
+}
+
+type fsyncIn struct {
+	Fh         uint64
+	FsyncFlags uint32
+	_          uint32
+}
+
+type setxattrInCommon struct {
+	Size  uint32
+	Flags uint32
+}
+
+func (setxattrInCommon) position() uint32 {
+	return 0
+}
+
+type getxattrInCommon struct {
+	Size uint32
+	_    uint32
+}
+
+func (getxattrInCommon) position() uint32 {
+	return 0
+}
+
+type getxattrOut struct {
+	Size uint32
+	_    uint32
+}
+
+type lkIn struct {
+	Fh      uint64
+	Owner   uint64
+	Lk      fileLock
+	LkFlags uint32
+	_       uint32
+}
+
+func lkInSize(p Protocol) uintptr {
+	switch {
+	case p.LT(Protocol{7, 9}):
+		return unsafe.Offsetof(lkIn{}.LkFlags)
+	default:
+		return unsafe.Sizeof(lkIn{})
+	}
+}
+
+type lkOut struct {
+	Lk fileLock
+}
+
+type accessIn struct {
+	Mask uint32
+	_    uint32
+}
+
+type initIn struct {
+	Major        uint32
+	Minor        uint32
+	MaxReadahead uint32
+	Flags        uint32
+}
+
+const initInSize = int(unsafe.Sizeof(initIn{}))
+
+type initOut struct {
+	Major        uint32
+	Minor        uint32
+	MaxReadahead uint32
+	Flags        uint32
+	Unused       uint32
+	MaxWrite     uint32
+}
+
+type interruptIn struct {
+	Unique uint64
+}
+
+type bmapIn struct {
+	Block     uint64
+	BlockSize uint32
+	_         uint32
+}
+
+type bmapOut struct {
+	Block uint64
+}
+
+type inHeader struct {
+	Len    uint32
+	Opcode uint32
+	Unique uint64
+	Nodeid uint64
+	Uid    uint32
+	Gid    uint32
+	Pid    uint32
+	_      uint32
+}
+
+const inHeaderSize = int(unsafe.Sizeof(inHeader{}))
+
+type outHeader struct {
+	Len    uint32
+	Error  int32
+	Unique uint64
+}
+
+type dirent struct {
+	Ino     uint64
+	Off     uint64
+	Namelen uint32
+	Type    uint32
+	Name    [0]byte
+}
+
+const direntSize = 8 + 8 + 4 + 4
+
+const (
+	notifyCodePoll       int32 = 1
+	notifyCodeInvalInode int32 = 2
+	notifyCodeInvalEntry int32 = 3
+)
+
+type notifyInvalInodeOut struct {
+	Ino uint64
+	Off int64
+	Len int64
+}
+
+type notifyInvalEntryOut struct {
+	Parent  uint64
+	Namelen uint32
+	_       uint32
+}