github.com/keybase/client/go@v0.0.0-20240309051027-028f7c731f8b/kbfs/libfuse/journal_control_file.go (about)

     1  // Copyright 2016 Keybase Inc. All rights reserved.
     2  // Use of this source code is governed by a BSD
     3  // license that can be found in the LICENSE file.
     4  //
     5  //go:build !windows
     6  // +build !windows
     7  
     8  package libfuse
     9  
    10  import (
    11  	"bazil.org/fuse"
    12  	"bazil.org/fuse/fs"
    13  	"github.com/keybase/client/go/kbfs/libfs"
    14  	"github.com/keybase/client/go/kbfs/libkbfs"
    15  	"golang.org/x/net/context"
    16  )
    17  
    18  // JournalControlFile is a special file used to control journal
    19  // settings.
    20  type JournalControlFile struct {
    21  	folder *Folder
    22  	action libfs.JournalAction
    23  }
    24  
    25  var _ fs.Node = (*JournalControlFile)(nil)
    26  
    27  // Attr implements the fs.Node interface for JournalControlFile.
    28  func (f *JournalControlFile) Attr(ctx context.Context, a *fuse.Attr) error {
    29  	a.Size = 0
    30  	a.Mode = 0222
    31  	return nil
    32  }
    33  
    34  var _ fs.Handle = (*JournalControlFile)(nil)
    35  
    36  var _ fs.HandleWriter = (*JournalControlFile)(nil)
    37  
    38  // Write implements the fs.HandleWriter interface for JournalControlFile.
    39  func (f *JournalControlFile) Write(ctx context.Context, req *fuse.WriteRequest,
    40  	resp *fuse.WriteResponse) (err error) {
    41  	f.folder.fs.log.CDebugf(ctx, "JournalControlFile (f.action=%s) Write",
    42  		f.action)
    43  	defer func() { err = f.folder.processError(ctx, libkbfs.WriteMode, err) }()
    44  	if len(req.Data) == 0 {
    45  		return nil
    46  	}
    47  
    48  	jManager, err := libkbfs.GetJournalManager(f.folder.fs.config)
    49  	if err != nil {
    50  		return err
    51  	}
    52  
    53  	err = f.action.Execute(
    54  		ctx, jManager, f.folder.getFolderBranch().Tlf, f.folder.h)
    55  	if err != nil {
    56  		return err
    57  	}
    58  
    59  	resp.Size = len(req.Data)
    60  	return nil
    61  }