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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 ext
import (
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/vfs"
)
// dentry implements vfs.DentryImpl.
//
// +stateify savable
type dentry struct {
vfsd vfs.Dentry
// Protected by filesystem.mu.
parent *dentry
name string
// inode is the inode represented by this dentry. Multiple Dentries may
// share a single non-directory Inode (with hard links). inode is
// immutable.
inode *inode
}
// Compiles only if dentry implements vfs.DentryImpl.
var _ vfs.DentryImpl = (*dentry)(nil)
// newDentry is the dentry constructor.
func newDentry(in *inode) *dentry {
d := &dentry{
inode: in,
}
d.vfsd.Init(d)
return d
}
// IncRef implements vfs.DentryImpl.IncRef.
func (d *dentry) IncRef() {
d.inode.incRef()
}
// TryIncRef implements vfs.DentryImpl.TryIncRef.
func (d *dentry) TryIncRef() bool {
return d.inode.tryIncRef()
}
// DecRef implements vfs.DentryImpl.DecRef.
func (d *dentry) DecRef(ctx context.Context) {
// FIXME(b/134676337): filesystem.mu may not be locked as required by
// inode.decRef().
d.inode.decRef()
}
// InotifyWithParent implements vfs.DentryImpl.InotifyWithParent.
//
// TODO(b/134676337): Implement inotify.
func (d *dentry) InotifyWithParent(ctx context.Context, events, cookie uint32, et vfs.EventType) {}
// Watches implements vfs.DentryImpl.Watches.
//
// TODO(b/134676337): Implement inotify.
func (d *dentry) Watches() *vfs.Watches {
return nil
}
// OnZeroWatches implements vfs.Dentry.OnZeroWatches.
//
// TODO(b/134676337): Implement inotify.
func (d *dentry) OnZeroWatches(context.Context) {}
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