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