76 lines
2.3 KiB
Go
76 lines
2.3 KiB
Go
|
// Copyright 2018 Google Inc.
|
||
|
|
//
|
||
|
|
// 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 linux
|
||
|
|
|
||
|
|
import (
|
||
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
|
||
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
|
||
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
|
||
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/kdefs"
|
||
|
|
"gvisor.googlesource.com/gvisor/pkg/syserror"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Sync implements linux system call sync(2).
|
||
|
|
func Sync(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
|
||
|
|
t.MountNamespace().SyncAll(t)
|
||
|
|
// Sync is always successful.
|
||
|
|
return 0, nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Syncfs implements linux system call syncfs(2).
|
||
|
|
func Syncfs(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
|
||
|
|
fd := kdefs.FD(args[0].Int())
|
||
|
|
|
||
|
|
file := t.FDMap().GetFile(fd)
|
||
|
|
if file == nil {
|
||
|
|
return 0, nil, syserror.EBADF
|
||
|
|
}
|
||
|
|
defer file.DecRef()
|
||
|
|
|
||
|
|
// Use "sync-the-world" for now, it's guaranteed that fd is at least
|
||
|
|
// on the root filesystem.
|
||
|
|
return Sync(t, args)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Fsync implements linux syscall fsync(2).
|
||
|
|
func Fsync(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
|
||
|
|
fd := kdefs.FD(args[0].Int())
|
||
|
|
|
||
|
|
file := t.FDMap().GetFile(fd)
|
||
|
|
if file == nil {
|
||
|
|
return 0, nil, syserror.EBADF
|
||
|
|
}
|
||
|
|
defer file.DecRef()
|
||
|
|
|
||
|
|
err := file.Fsync(t, 0, fs.FileMaxOffset, fs.SyncAll)
|
||
|
|
return 0, nil, syserror.ConvertIntr(err, kernel.ERESTARTSYS)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Fdatasync implements linux syscall fdatasync(2).
|
||
|
|
//
|
||
|
|
// At the moment, it just calls Fsync, which is a big hammer, but correct.
|
||
|
|
func Fdatasync(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
|
||
|
|
fd := kdefs.FD(args[0].Int())
|
||
|
|
|
||
|
|
file := t.FDMap().GetFile(fd)
|
||
|
|
if file == nil {
|
||
|
|
return 0, nil, syserror.EBADF
|
||
|
|
}
|
||
|
|
defer file.DecRef()
|
||
|
|
|
||
|
|
err := file.Fsync(t, 0, fs.FileMaxOffset, fs.SyncData)
|
||
|
|
return 0, nil, syserror.ConvertIntr(err, kernel.ERESTARTSYS)
|
||
|
|
}
|