forked from keybase/kbfs
/
reset_caches_file.go
49 lines (41 loc) · 1.45 KB
/
reset_caches_file.go
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// Copyright 2016 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
package libfuse
import (
"bazil.org/fuse"
"bazil.org/fuse/fs"
"github.com/keybase/kbfs/libkbfs"
"golang.org/x/net/context"
)
// ResetCachesFile represents a write-only file where any write of at
// least one byte triggers the resetting of all data caches. It can
// be reached from any directory under the FUSE mountpoint. Note that
// it does not clear the *node* cache, which means that the
// BlockPointers for existing nodes are still cached, such that
// directory listings can still be implicitly cached for nodes still
// being held by the kernel.
type ResetCachesFile struct {
fs *FS
}
var _ fs.Node = (*ResetCachesFile)(nil)
// Attr implements the fs.Node interface for ResetCachesFile.
func (f *ResetCachesFile) Attr(ctx context.Context, a *fuse.Attr) error {
a.Size = 0
a.Mode = 0222
return nil
}
var _ fs.Handle = (*ResetCachesFile)(nil)
var _ fs.HandleWriter = (*ResetCachesFile)(nil)
// Write implements the fs.HandleWriter interface for ResetCachesFile.
func (f *ResetCachesFile) Write(ctx context.Context, req *fuse.WriteRequest,
resp *fuse.WriteResponse) (err error) {
f.fs.log.CDebugf(ctx, "ResetCachesFile Write")
defer func() { err = f.fs.processError(ctx, libkbfs.WriteMode, err) }()
if len(req.Data) == 0 {
return nil
}
f.fs.config.ResetCaches()
resp.Size = len(req.Data)
return nil
}