gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/fsimpl/kernfs/save_restore.go (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package kernfs
    16  
    17  import (
    18  	"context"
    19  
    20  	"gvisor.dev/gvisor/pkg/refs"
    21  )
    22  
    23  // afterLoad is invoked by stateify.
    24  func (d *Dentry) afterLoad(context.Context) {
    25  	if d.refs.Load() >= 0 {
    26  		refs.Register(d)
    27  	}
    28  }
    29  
    30  // afterLoad is invoked by stateify.
    31  func (i *inodePlatformFile) afterLoad(context.Context) {
    32  	if i.fileMapper.IsInited() {
    33  		// Ensure that we don't call i.fileMapper.Init() again.
    34  		i.fileMapperInitOnce.Do(func() {})
    35  	}
    36  }
    37  
    38  // saveParent is called by stateify.
    39  func (d *Dentry) saveParent() *Dentry {
    40  	return d.parent.Load()
    41  }
    42  
    43  // loadParent is called by stateify.
    44  func (d *Dentry) loadParent(_ context.Context, parent *Dentry) {
    45  	d.parent.Store(parent)
    46  }