/usr/share/gocode/src/github.com/jacobsa/fuse/mounted_file_system.go is in golang-github-jacobsa-fuse-dev 0.0~git20150806.0.9a7512a-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | // Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fuse
import (
"fmt"
"golang.org/x/net/context"
)
// A type that knows how to serve ops read from a connection.
type Server interface {
// Read and serve ops from the supplied connection until EOF. Do not return
// until all operations have been responded to. Must not be called more than
// once.
ServeOps(*Connection)
}
// A struct representing the status of a mount operation, with a method that
// waits for unmounting.
type MountedFileSystem struct {
dir string
// The result to return from Join. Not valid until the channel is closed.
joinStatus error
joinStatusAvailable chan struct{}
}
// Return the directory on which the file system is mounted (or where we
// attempted to mount it.)
func (mfs *MountedFileSystem) Dir() string {
return mfs.dir
}
// Block until a mounted file system has been unmounted. Do not return
// successfully until all ops read from the connection have been responded to
// (i.e. the file system server has finished processing all in-flight ops).
//
// The return value will be non-nil if anything unexpected happened while
// serving. May be called multiple times.
func (mfs *MountedFileSystem) Join(ctx context.Context) error {
select {
case <-mfs.joinStatusAvailable:
return mfs.joinStatus
case <-ctx.Done():
return ctx.Err()
}
}
// Attempt to mount a file system on the given directory, using the supplied
// Server to serve connection requests. This function blocks until the file
// system is successfully mounted.
func Mount(
dir string,
server Server,
config *MountConfig) (mfs *MountedFileSystem, err error) {
// Initialize the struct.
mfs = &MountedFileSystem{
dir: dir,
joinStatusAvailable: make(chan struct{}),
}
// Begin the mounting process, which will continue in the background.
ready := make(chan error, 1)
dev, err := mount(dir, config, ready)
if err != nil {
err = fmt.Errorf("mount: %v", err)
return
}
// Choose a parent context for ops.
opContext := config.OpContext
if opContext == nil {
opContext = context.Background()
}
// Create a Connection object wrapping the device.
connection, err := newConnection(
opContext,
config.DebugLogger,
config.ErrorLogger,
dev)
if err != nil {
err = fmt.Errorf("newConnection: %v", err)
return
}
// Serve the connection in the background. When done, set the join status.
go func() {
server.ServeOps(connection)
mfs.joinStatus = connection.close()
close(mfs.joinStatusAvailable)
}()
// Wait for the mount process to complete.
if err = <-ready; err != nil {
err = fmt.Errorf("mount (background): %v", err)
return
}
return
}
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