48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
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// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gofer
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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func (d *dentry) isSymlink() bool {
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return d.fileType() == linux.S_IFLNK
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}
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// Precondition: d.isSymlink().
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func (d *dentry) readlink(ctx context.Context, mnt *vfs.Mount) (string, error) {
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if d.fs.opts.interop != InteropModeShared {
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d.touchAtime(ctx, mnt)
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d.dataMu.Lock()
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if d.haveTarget {
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target := d.target
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d.dataMu.Unlock()
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return target, nil
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}
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}
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target, err := d.file.readlink(ctx)
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if d.fs.opts.interop != InteropModeShared {
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if err == nil {
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d.haveTarget = true
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d.target = target
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}
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d.dataMu.Unlock()
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}
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return target, err
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}
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