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// 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(mnt)
d.dataMu.Lock()
if d.haveTarget {
target := d.target
d.dataMu.Unlock()
return target, nil
}
}
var target string
var err error
if d.fs.opts.lisaEnabled {
target, err = d.controlFDLisa.ReadLinkAt(ctx)
} else {
target, err = d.file.readlink(ctx)
}
if d.fs.opts.interop != InteropModeShared {
if err == nil {
d.haveTarget = true
d.target = target
}
d.dataMu.Unlock() // +checklocksforce: guaranteed locked from above.
}
return target, err
}
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