gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/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  	"gvisor.dev/gvisor/pkg/abi/linux"
    19  	"gvisor.dev/gvisor/pkg/atomicbitops"
    20  	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
    21  )
    22  
    23  // +stateify savable
    24  type symlink struct {
    25  	inode  inode
    26  	target string // immutable
    27  }
    28  
    29  func (fs *filesystem) newSymlink(kuid auth.KUID, kgid auth.KGID, mode linux.FileMode, target string, parentDir *directory) *inode {
    30  	link := &symlink{
    31  		target: target,
    32  	}
    33  	link.inode.init(link, fs, kuid, kgid, linux.S_IFLNK|mode, parentDir)
    34  	link.inode.nlink = atomicbitops.FromUint32(1) // from parent directory
    35  	return &link.inode
    36  }
    37  
    38  // O_PATH is unimplemented, so there's no way to get a FileDescription
    39  // representing a symlink yet.