48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
// Copyright 2019 The gVisor Authors.
|
|
//
|
|
// 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 gofer
|
|
|
|
import (
|
|
"gvisor.dev/gvisor/pkg/abi/linux"
|
|
"gvisor.dev/gvisor/pkg/context"
|
|
"gvisor.dev/gvisor/pkg/sentry/vfs"
|
|
)
|
|
|
|
func (d *dentry) isSymlink() bool {
|
|
return d.fileType() == linux.S_IFLNK
|
|
}
|
|
|
|
// Precondition: d.isSymlink().
|
|
func (d *dentry) readlink(ctx context.Context, mnt *vfs.Mount) (string, error) {
|
|
if d.fs.opts.interop != InteropModeShared {
|
|
d.touchAtime(ctx, mnt)
|
|
d.dataMu.Lock()
|
|
if d.haveTarget {
|
|
target := d.target
|
|
d.dataMu.Unlock()
|
|
return target, nil
|
|
}
|
|
}
|
|
target, err := d.file.readlink(ctx)
|
|
if d.fs.opts.interop != InteropModeShared {
|
|
if err == nil {
|
|
d.haveTarget = true
|
|
d.target = target
|
|
}
|
|
d.dataMu.Unlock()
|
|
}
|
|
return target, err
|
|
}
|