306 lines
6.6 KiB
Go
306 lines
6.6 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package fuseops
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import (
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"log"
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"time"
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"golang.org/x/net/context"
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"github.com/jacobsa/bazilfuse"
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)
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// This function is an implementation detail of the fuse package, and must not
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// be called by anyone else.
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//
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// Convert the supplied bazilfuse request struct to an Op. finished will be
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// called with the error supplied to o.Respond when the user invokes that
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// method, before a response is sent to the kernel.
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//
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// It is guaranteed that o != nil. If the op is unknown, a special unexported
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// type will be used.
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//
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// The debug logging function and error logger may be nil.
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func Convert(
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opCtx context.Context,
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r bazilfuse.Request,
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debugLogForOp func(int, string, ...interface{}),
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errorLogger *log.Logger,
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finished func(error)) (o Op) {
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var co *commonOp
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var io internalOp
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switch typed := r.(type) {
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case *bazilfuse.LookupRequest:
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to := &LookUpInodeOp{
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Parent: InodeID(typed.Header.Node),
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Name: typed.Name,
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.GetattrRequest:
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to := &GetInodeAttributesOp{
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Inode: InodeID(typed.Header.Node),
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.SetattrRequest:
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to := &SetInodeAttributesOp{
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Inode: InodeID(typed.Header.Node),
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}
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if typed.Valid&bazilfuse.SetattrSize != 0 {
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to.Size = &typed.Size
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}
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if typed.Valid&bazilfuse.SetattrMode != 0 {
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to.Mode = &typed.Mode
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}
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if typed.Valid&bazilfuse.SetattrAtime != 0 {
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to.Atime = &typed.Atime
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}
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if typed.Valid&bazilfuse.SetattrMtime != 0 {
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to.Mtime = &typed.Mtime
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.ForgetRequest:
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to := &ForgetInodeOp{
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Inode: InodeID(typed.Header.Node),
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N: typed.N,
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.MkdirRequest:
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to := &MkDirOp{
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Parent: InodeID(typed.Header.Node),
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Name: typed.Name,
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Mode: typed.Mode,
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.CreateRequest:
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to := &CreateFileOp{
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Parent: InodeID(typed.Header.Node),
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Name: typed.Name,
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Mode: typed.Mode,
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Flags: typed.Flags,
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.SymlinkRequest:
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to := &CreateSymlinkOp{
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Parent: InodeID(typed.Header.Node),
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Name: typed.NewName,
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Target: typed.Target,
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.RenameRequest:
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to := &RenameOp{
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OldParent: InodeID(typed.Header.Node),
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OldName: typed.OldName,
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NewParent: InodeID(typed.NewDir),
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NewName: typed.NewName,
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.RemoveRequest:
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if typed.Dir {
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to := &RmDirOp{
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Parent: InodeID(typed.Header.Node),
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Name: typed.Name,
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}
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io = to
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co = &to.commonOp
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} else {
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to := &UnlinkOp{
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Parent: InodeID(typed.Header.Node),
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Name: typed.Name,
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}
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io = to
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co = &to.commonOp
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}
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case *bazilfuse.OpenRequest:
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if typed.Dir {
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to := &OpenDirOp{
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Inode: InodeID(typed.Header.Node),
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Flags: typed.Flags,
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}
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io = to
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co = &to.commonOp
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} else {
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to := &OpenFileOp{
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Inode: InodeID(typed.Header.Node),
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Flags: typed.Flags,
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}
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io = to
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co = &to.commonOp
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}
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case *bazilfuse.ReadRequest:
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if typed.Dir {
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to := &ReadDirOp{
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Inode: InodeID(typed.Header.Node),
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Handle: HandleID(typed.Handle),
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Offset: DirOffset(typed.Offset),
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Size: typed.Size,
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}
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io = to
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co = &to.commonOp
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} else {
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to := &ReadFileOp{
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Inode: InodeID(typed.Header.Node),
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Handle: HandleID(typed.Handle),
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Offset: typed.Offset,
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Size: typed.Size,
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}
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io = to
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co = &to.commonOp
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}
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case *bazilfuse.ReleaseRequest:
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if typed.Dir {
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to := &ReleaseDirHandleOp{
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Handle: HandleID(typed.Handle),
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}
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io = to
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co = &to.commonOp
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} else {
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to := &ReleaseFileHandleOp{
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Handle: HandleID(typed.Handle),
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}
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io = to
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co = &to.commonOp
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}
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case *bazilfuse.WriteRequest:
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to := &WriteFileOp{
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Inode: InodeID(typed.Header.Node),
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Handle: HandleID(typed.Handle),
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Data: typed.Data,
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Offset: typed.Offset,
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.FsyncRequest:
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// We don't currently support this for directories.
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if typed.Dir {
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to := &unknownOp{}
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io = to
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co = &to.commonOp
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} else {
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to := &SyncFileOp{
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Inode: InodeID(typed.Header.Node),
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Handle: HandleID(typed.Handle),
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}
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io = to
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co = &to.commonOp
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}
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case *bazilfuse.FlushRequest:
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to := &FlushFileOp{
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Inode: InodeID(typed.Header.Node),
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Handle: HandleID(typed.Handle),
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}
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io = to
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co = &to.commonOp
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case *bazilfuse.ReadlinkRequest:
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to := &ReadSymlinkOp{
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Inode: InodeID(typed.Header.Node),
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}
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io = to
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co = &to.commonOp
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default:
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to := &unknownOp{}
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io = to
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co = &to.commonOp
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}
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co.init(
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opCtx,
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io,
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r,
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debugLogForOp,
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errorLogger,
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finished)
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o = io
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return
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}
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func convertAttributes(
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inode InodeID,
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attr InodeAttributes,
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expiration time.Time) bazilfuse.Attr {
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return bazilfuse.Attr{
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Inode: uint64(inode),
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Size: attr.Size,
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Mode: attr.Mode,
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Nlink: uint32(attr.Nlink),
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Atime: attr.Atime,
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Mtime: attr.Mtime,
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Ctime: attr.Ctime,
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Crtime: attr.Crtime,
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Uid: attr.Uid,
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Gid: attr.Gid,
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Valid: convertExpirationTime(expiration),
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}
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}
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// Convert an absolute cache expiration time to a relative time from now for
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// consumption by fuse.
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func convertExpirationTime(t time.Time) (d time.Duration) {
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// Fuse represents durations as unsigned 64-bit counts of seconds and 32-bit
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// counts of nanoseconds (cf. http://goo.gl/EJupJV). The bazil.org/fuse
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// package converts time.Duration values to this form in a straightforward
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// way (cf. http://goo.gl/FJhV8j).
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//
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// So negative durations are right out. There is no need to cap the positive
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// magnitude, because 2^64 seconds is well longer than the 2^63 ns range of
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// time.Duration.
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d = t.Sub(time.Now())
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if d < 0 {
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d = 0
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}
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return
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}
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func convertChildInodeEntry(
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in *ChildInodeEntry,
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out *bazilfuse.LookupResponse) {
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out.Node = bazilfuse.NodeID(in.Child)
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out.Generation = uint64(in.Generation)
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out.Attr = convertAttributes(in.Child, in.Attributes, in.AttributesExpiration)
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out.EntryValid = convertExpirationTime(in.EntryExpiration)
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}
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