restic/vendor/bazil.org/fuse/fuse_kernel.go

775 lines
18 KiB
Go

// 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
}