76 lines
2.3 KiB
Go
76 lines
2.3 KiB
Go
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// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package linux
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import (
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"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/kdefs"
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"gvisor.googlesource.com/gvisor/pkg/syserror"
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)
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// Sync implements linux system call sync(2).
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func Sync(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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t.MountNamespace().SyncAll(t)
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// Sync is always successful.
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return 0, nil, nil
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}
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// Syncfs implements linux system call syncfs(2).
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func Syncfs(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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fd := kdefs.FD(args[0].Int())
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file := t.FDMap().GetFile(fd)
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if file == nil {
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return 0, nil, syserror.EBADF
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}
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defer file.DecRef()
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// Use "sync-the-world" for now, it's guaranteed that fd is at least
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// on the root filesystem.
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return Sync(t, args)
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}
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// Fsync implements linux syscall fsync(2).
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func Fsync(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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fd := kdefs.FD(args[0].Int())
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file := t.FDMap().GetFile(fd)
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if file == nil {
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return 0, nil, syserror.EBADF
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}
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defer file.DecRef()
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err := file.Fsync(t, 0, fs.FileMaxOffset, fs.SyncAll)
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return 0, nil, syserror.ConvertIntr(err, kernel.ERESTARTSYS)
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}
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// Fdatasync implements linux syscall fdatasync(2).
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//
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// At the moment, it just calls Fsync, which is a big hammer, but correct.
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func Fdatasync(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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fd := kdefs.FD(args[0].Int())
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file := t.FDMap().GetFile(fd)
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if file == nil {
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return 0, nil, syserror.EBADF
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}
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defer file.DecRef()
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err := file.Fsync(t, 0, fs.FileMaxOffset, fs.SyncData)
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return 0, nil, syserror.ConvertIntr(err, kernel.ERESTARTSYS)
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}
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