87 lines
2.7 KiB
Go
87 lines
2.7 KiB
Go
// 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/abi/linux"
|
|
"gvisor.dev/gvisor/pkg/sentry/context"
|
|
"gvisor.dev/gvisor/pkg/sentry/vfs"
|
|
"gvisor.dev/gvisor/pkg/syserror"
|
|
)
|
|
|
|
// fileDescription is embedded by ext implementations of
|
|
// vfs.FileDescriptionImpl.
|
|
type fileDescription struct {
|
|
vfsfd vfs.FileDescription
|
|
vfs.FileDescriptionDefaultImpl
|
|
|
|
// flags is the same as vfs.OpenOptions.Flags which are passed to
|
|
// vfs.FilesystemImpl.OpenAt.
|
|
// TODO(b/134676337): syscalls like read(2), write(2), fchmod(2), fchown(2),
|
|
// fgetxattr(2), ioctl(2), mmap(2) should fail with EBADF if O_PATH is set.
|
|
// Only close(2), fstat(2), fstatfs(2) should work.
|
|
flags uint32
|
|
}
|
|
|
|
func (fd *fileDescription) filesystem() *filesystem {
|
|
return fd.vfsfd.VirtualDentry().Mount().Filesystem().Impl().(*filesystem)
|
|
}
|
|
|
|
func (fd *fileDescription) inode() *inode {
|
|
return fd.vfsfd.VirtualDentry().Dentry().Impl().(*dentry).inode
|
|
}
|
|
|
|
// OnClose implements vfs.FileDescriptionImpl.OnClose.
|
|
func (fd *fileDescription) OnClose() error { return nil }
|
|
|
|
// StatusFlags implements vfs.FileDescriptionImpl.StatusFlags.
|
|
func (fd *fileDescription) StatusFlags(ctx context.Context) (uint32, error) {
|
|
return fd.flags, nil
|
|
}
|
|
|
|
// SetStatusFlags implements vfs.FileDescriptionImpl.SetStatusFlags.
|
|
func (fd *fileDescription) SetStatusFlags(ctx context.Context, flags uint32) error {
|
|
// None of the flags settable by fcntl(F_SETFL) are supported, so this is a
|
|
// no-op.
|
|
return nil
|
|
}
|
|
|
|
// Stat implements vfs.FileDescriptionImpl.Stat.
|
|
func (fd *fileDescription) Stat(ctx context.Context, opts vfs.StatOptions) (linux.Statx, error) {
|
|
var stat linux.Statx
|
|
fd.inode().statTo(&stat)
|
|
return stat, nil
|
|
}
|
|
|
|
// SetStat implements vfs.FileDescriptionImpl.SetStat.
|
|
func (fd *fileDescription) SetStat(ctx context.Context, opts vfs.SetStatOptions) error {
|
|
if opts.Stat.Mask == 0 {
|
|
return nil
|
|
}
|
|
return syserror.EPERM
|
|
}
|
|
|
|
// SetStat implements vfs.FileDescriptionImpl.StatFS.
|
|
func (fd *fileDescription) StatFS(ctx context.Context) (linux.Statfs, error) {
|
|
var stat linux.Statfs
|
|
fd.filesystem().statTo(&stat)
|
|
return stat, nil
|
|
}
|
|
|
|
// Sync implements vfs.FileDescriptionImpl.Sync.
|
|
func (fd *fileDescription) Sync(ctx context.Context) error {
|
|
return nil
|
|
}
|