github.com/scaleoutsean/fusego@v0.0.0-20220224074057-4a6429e46bb8/mounted_file_system.go (about)

     1  // Copyright 2015 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package fuse
    16  
    17  import "context"
    18  
    19  // MountedFileSystem represents the status of a mount operation, with a method
    20  // that waits for unmounting.
    21  type MountedFileSystem struct {
    22  	dir string
    23  
    24  	// The result to return from Join. Not valid until the channel is closed.
    25  	joinStatus          error
    26  	joinStatusAvailable chan struct{}
    27  }
    28  
    29  // Dir returns the directory on which the file system is mounted (or where we
    30  // attempted to mount it.)
    31  func (mfs *MountedFileSystem) Dir() string {
    32  	return mfs.dir
    33  }
    34  
    35  // Join blocks until a mounted file system has been unmounted. It does not
    36  // return successfully until all ops read from the connection have been
    37  // responded to (i.e. the file system server has finished processing all
    38  // in-flight ops).
    39  //
    40  // The return value will be non-nil if anything unexpected happened while
    41  // serving. May be called multiple times.
    42  func (mfs *MountedFileSystem) Join(ctx context.Context) error {
    43  	select {
    44  	case <-mfs.joinStatusAvailable:
    45  		return mfs.joinStatus
    46  	case <-ctx.Done():
    47  		return ctx.Err()
    48  	}
    49  }