github.com/keybase/client/go@v0.0.0-20240309051027-028f7c731f8b/kbfs/libdokan/reset_caches_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  package libdokan
     6  
     7  import (
     8  	"github.com/keybase/client/go/kbfs/dokan"
     9  	"github.com/keybase/client/go/kbfs/libkbfs"
    10  	"golang.org/x/net/context"
    11  )
    12  
    13  // ResetCachesFile represents a write-only file where any write of at
    14  // least one byte triggers the resetting of all data caches.  It can
    15  // only be reached from the top-level FS mount.  Note that it does not
    16  // clear the *node* cache, which means that the BlockPointers for
    17  // existing nodes are still cached, such that directory listings can
    18  // still be implicitly cached for nodes still being held by callers.
    19  type ResetCachesFile struct {
    20  	fs *FS
    21  	specialWriteFile
    22  }
    23  
    24  // WriteFile implements writes for dokan.
    25  func (f *ResetCachesFile) WriteFile(ctx context.Context, fi *dokan.FileInfo, bs []byte, offset int64) (n int, err error) {
    26  	f.fs.logEnter(ctx, "ResetCachesFile Write")
    27  	defer func() { f.fs.reportErr(ctx, libkbfs.WriteMode, err) }()
    28  	if len(bs) == 0 {
    29  		return 0, nil
    30  	}
    31  	f.fs.config.ResetCaches()
    32  	return len(bs), nil
    33  }