github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/syscalls/linux/vfs2/stat_amd64.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  // +build amd64
    16  
    17  package vfs2
    18  
    19  import (
    20  	"github.com/SagerNet/gvisor/pkg/abi/linux"
    21  	"github.com/SagerNet/gvisor/pkg/sentry/kernel"
    22  	"github.com/SagerNet/gvisor/pkg/sentry/kernel/auth"
    23  )
    24  
    25  // This takes both input and output as pointer arguments to avoid copying large
    26  // structs.
    27  func convertStatxToUserStat(t *kernel.Task, statx *linux.Statx, stat *linux.Stat) {
    28  	// Linux just copies fields from struct kstat without regard to struct
    29  	// kstat::result_mask (fs/stat.c:cp_new_stat()), so we do too.
    30  	userns := t.UserNamespace()
    31  	*stat = linux.Stat{
    32  		Dev:     uint64(linux.MakeDeviceID(uint16(statx.DevMajor), statx.DevMinor)),
    33  		Ino:     statx.Ino,
    34  		Nlink:   uint64(statx.Nlink),
    35  		Mode:    uint32(statx.Mode),
    36  		UID:     uint32(auth.KUID(statx.UID).In(userns).OrOverflow()),
    37  		GID:     uint32(auth.KGID(statx.GID).In(userns).OrOverflow()),
    38  		Rdev:    uint64(linux.MakeDeviceID(uint16(statx.RdevMajor), statx.RdevMinor)),
    39  		Size:    int64(statx.Size),
    40  		Blksize: int64(statx.Blksize),
    41  		Blocks:  int64(statx.Blocks),
    42  		ATime:   timespecFromStatxTimestamp(statx.Atime),
    43  		MTime:   timespecFromStatxTimestamp(statx.Mtime),
    44  		CTime:   timespecFromStatxTimestamp(statx.Ctime),
    45  	}
    46  }