516 lines
12 KiB
Go
516 lines
12 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 fuse
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import (
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"fmt"
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"io"
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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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// An object that terminates one end of the userspace <-> FUSE VFS connection.
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type server struct {
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logger *log.Logger
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fs FileSystem
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}
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// Create a server that relays requests to the supplied file system.
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func newServer(fs FileSystem) (s *server, err error) {
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s = &server{
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logger: getLogger(),
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fs: fs,
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}
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return
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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)
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out.AttrValid = convertExpirationTime(in.AttributesExpiration)
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out.EntryValid = convertExpirationTime(in.EntryExpiration)
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}
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func convertHeader(
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in bazilfuse.Header) (out RequestHeader) {
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out.Uid = in.Uid
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out.Gid = in.Gid
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return
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}
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// Serve the fuse connection by repeatedly reading requests from the supplied
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// FUSE connection, responding as dictated by the file system. Return when the
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// connection is closed or an unexpected error occurs.
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func (s *server) Serve(c *bazilfuse.Conn) (err error) {
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// Read a message at a time, dispatching to goroutines doing the actual
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// processing.
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for {
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var fuseReq bazilfuse.Request
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fuseReq, err = c.ReadRequest()
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// ReadRequest returns EOF when the connection has been closed.
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if err == io.EOF {
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err = nil
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return
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}
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// Otherwise, forward on errors.
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if err != nil {
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err = fmt.Errorf("Conn.ReadRequest: %v", err)
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return
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}
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go s.handleFuseRequest(fuseReq)
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}
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}
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func (s *server) handleFuseRequest(fuseReq bazilfuse.Request) {
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// Log the request.
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s.logger.Println("Received:", fuseReq)
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// If it becomes important, we can support cancellation when interrupted (cf.
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// http://goo.gl/C08eAv). If we want to do this, we should find some way to
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// coax the system into reproducing such requests so we can test the
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// behavior.
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ctx := context.Background()
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// Attempt to handle it.
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switch typed := fuseReq.(type) {
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case *bazilfuse.InitRequest:
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// Convert the request.
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req := &InitRequest{
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Header: convertHeader(typed.Header),
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}
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// Call the file system.
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_, err := s.fs.Init(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.InitResponse{}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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case *bazilfuse.StatfsRequest:
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// Responding to this is required to make mounting work, at least on OS X.
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// We don't currently expose the capability for the file system to
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// intercept this.
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fuseResp := &bazilfuse.StatfsResponse{}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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case *bazilfuse.LookupRequest:
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// Convert the request.
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req := &LookUpInodeRequest{
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Header: convertHeader(typed.Header),
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Parent: InodeID(typed.Header.Node),
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Name: typed.Name,
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}
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// Call the file system.
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resp, err := s.fs.LookUpInode(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.LookupResponse{}
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convertChildInodeEntry(&resp.Entry, fuseResp)
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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case *bazilfuse.GetattrRequest:
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// Convert the request.
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req := &GetInodeAttributesRequest{
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Header: convertHeader(typed.Header),
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Inode: InodeID(typed.Header.Node),
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}
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// Call the file system.
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resp, err := s.fs.GetInodeAttributes(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.GetattrResponse{
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Attr: convertAttributes(req.Inode, resp.Attributes),
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AttrValid: convertExpirationTime(resp.AttributesExpiration),
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}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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case *bazilfuse.SetattrRequest:
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// Convert the request.
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req := &SetInodeAttributesRequest{
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Header: convertHeader(typed.Header),
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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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req.Size = &typed.Size
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}
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if typed.Valid&bazilfuse.SetattrMode != 0 {
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req.Mode = &typed.Mode
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}
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if typed.Valid&bazilfuse.SetattrAtime != 0 {
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req.Atime = &typed.Atime
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}
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if typed.Valid&bazilfuse.SetattrMtime != 0 {
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req.Mtime = &typed.Mtime
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}
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// Call the file system.
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resp, err := s.fs.SetInodeAttributes(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.SetattrResponse{
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Attr: convertAttributes(req.Inode, resp.Attributes),
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AttrValid: convertExpirationTime(resp.AttributesExpiration),
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}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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case *bazilfuse.MkdirRequest:
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// Convert the request.
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req := &MkDirRequest{
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Header: convertHeader(typed.Header),
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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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// Call the file system.
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resp, err := s.fs.MkDir(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.MkdirResponse{}
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convertChildInodeEntry(&resp.Entry, &fuseResp.LookupResponse)
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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case *bazilfuse.CreateRequest:
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// Convert the request.
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req := &CreateFileRequest{
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Header: convertHeader(typed.Header),
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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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// Call the file system.
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resp, err := s.fs.CreateFile(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.CreateResponse{
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OpenResponse: bazilfuse.OpenResponse{
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Handle: bazilfuse.HandleID(resp.Handle),
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},
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}
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convertChildInodeEntry(&resp.Entry, &fuseResp.LookupResponse)
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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case *bazilfuse.RemoveRequest:
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if typed.Dir {
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// Convert the request.
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req := &RmDirRequest{
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Header: convertHeader(typed.Header),
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Parent: InodeID(typed.Header.Node),
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Name: typed.Name,
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}
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// Call the file system.
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_, err := s.fs.RmDir(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Respond successfully.
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s.logger.Println("Responding OK.")
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typed.Respond()
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} else {
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// Convert the request.
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req := &UnlinkRequest{
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Header: convertHeader(typed.Header),
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Parent: InodeID(typed.Header.Node),
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Name: typed.Name,
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}
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// Call the file system.
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_, err := s.fs.Unlink(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Respond successfully.
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s.logger.Println("Responding OK.")
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typed.Respond()
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}
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case *bazilfuse.OpenRequest:
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// Directory or file?
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if typed.Dir {
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// Convert the request.
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req := &OpenDirRequest{
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Header: convertHeader(typed.Header),
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Inode: InodeID(typed.Header.Node),
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Flags: typed.Flags,
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}
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// Call the file system.
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resp, err := s.fs.OpenDir(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.OpenResponse{
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Handle: bazilfuse.HandleID(resp.Handle),
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}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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} else {
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// Convert the request.
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req := &OpenFileRequest{
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Header: convertHeader(typed.Header),
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Inode: InodeID(typed.Header.Node),
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Flags: typed.Flags,
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}
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// Call the file system.
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resp, err := s.fs.OpenFile(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.OpenResponse{
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Handle: bazilfuse.HandleID(resp.Handle),
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}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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}
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case *bazilfuse.ReadRequest:
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// Directory or file?
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if typed.Dir {
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// Convert the request.
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req := &ReadDirRequest{
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Header: convertHeader(typed.Header),
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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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// Call the file system.
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resp, err := s.fs.ReadDir(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.ReadResponse{
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Data: resp.Data,
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}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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} else {
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// Convert the request.
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req := &ReadFileRequest{
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Header: convertHeader(typed.Header),
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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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// Call the file system.
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resp, err := s.fs.ReadFile(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.ReadResponse{
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Data: resp.Data,
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}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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}
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case *bazilfuse.ReleaseRequest:
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// Directory or file?
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if typed.Dir {
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// Convert the request.
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req := &ReleaseDirHandleRequest{
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Header: convertHeader(typed.Header),
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Handle: HandleID(typed.Handle),
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}
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// Call the file system.
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_, err := s.fs.ReleaseDirHandle(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Respond successfully.
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s.logger.Println("Responding OK.")
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typed.Respond()
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} else {
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// Convert the request.
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req := &ReleaseFileHandleRequest{
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Header: convertHeader(typed.Header),
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Handle: HandleID(typed.Handle),
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}
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// Call the file system.
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_, err := s.fs.ReleaseFileHandle(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Respond successfully.
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s.logger.Println("Responding OK.")
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typed.Respond()
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}
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case *bazilfuse.WriteRequest:
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// Convert the request.
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req := &WriteFileRequest{
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Header: convertHeader(typed.Header),
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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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// Call the file system.
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_, err := s.fs.WriteFile(ctx, req)
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if err != nil {
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s.logger.Println("Responding:", err)
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typed.RespondError(err)
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return
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}
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// Convert the response.
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fuseResp := &bazilfuse.WriteResponse{
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Size: len(typed.Data),
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}
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s.logger.Println("Responding:", fuseResp)
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typed.Respond(fuseResp)
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default:
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s.logger.Println("Unhandled type. Returning ENOSYS.")
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typed.RespondError(ENOSYS)
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}
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}
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func convertAttributes(inode InodeID, attr InodeAttributes) 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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}
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}
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