88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
// Copyright 2020 The gVisor Authors.
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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 vfs2
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/arch"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/syserror"
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)
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// Sync implements Linux syscall sync(2).
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func Sync(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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return 0, nil, t.Kernel().VFS().SyncAllFilesystems(t)
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}
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// Syncfs implements Linux syscall syncfs(2).
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func Syncfs(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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fd := args[0].Int()
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file := t.GetFileVFS2(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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return 0, nil, file.SyncFS(t)
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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 := args[0].Int()
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file := t.GetFileVFS2(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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return 0, nil, file.Sync(t)
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}
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// Fdatasync implements Linux syscall fdatasync(2).
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func Fdatasync(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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// TODO(gvisor.dev/issue/1897): Avoid writeback of unnecessary metadata.
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return Fsync(t, args)
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}
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// SyncFileRange implements Linux syscall sync_file_range(2).
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func SyncFileRange(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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fd := args[0].Int()
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offset := args[1].Int64()
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nbytes := args[2].Int64()
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flags := args[3].Uint()
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if offset < 0 {
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return 0, nil, syserror.EINVAL
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}
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if nbytes < 0 {
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return 0, nil, syserror.EINVAL
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}
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if flags&^(linux.SYNC_FILE_RANGE_WAIT_BEFORE|linux.SYNC_FILE_RANGE_WRITE|linux.SYNC_FILE_RANGE_WAIT_AFTER) != 0 {
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return 0, nil, syserror.EINVAL
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}
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file := t.GetFileVFS2(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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// TODO(gvisor.dev/issue/1897): Avoid writeback of data ranges outside of
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// [offset, offset+nbytes).
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return 0, nil, file.Sync(t)
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}
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