github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/fsimpl/tmpfs/symlink.go (about)

     1  // Copyright 2019 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 tmpfs
    16  
    17  import (
    18  	"github.com/SagerNet/gvisor/pkg/abi/linux"
    19  	"github.com/SagerNet/gvisor/pkg/sentry/kernel/auth"
    20  )
    21  
    22  // +stateify savable
    23  type symlink struct {
    24  	inode  inode
    25  	target string // immutable
    26  }
    27  
    28  func (fs *filesystem) newSymlink(kuid auth.KUID, kgid auth.KGID, mode linux.FileMode, target string, parentDir *directory) *inode {
    29  	link := &symlink{
    30  		target: target,
    31  	}
    32  	link.inode.init(link, fs, kuid, kgid, linux.S_IFLNK|mode, parentDir)
    33  	link.inode.nlink = 1 // from parent directory
    34  	return &link.inode
    35  }
    36  
    37  // O_PATH is unimplemented, so there's no way to get a FileDescription
    38  // representing a symlink yet.