66 lines
1.9 KiB
Go
66 lines
1.9 KiB
Go
// Copyright 2018 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 sys
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import (
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/fs"
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)
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// filesystem is a sysfs.
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//
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// +stateify savable
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type filesystem struct{}
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var _ fs.Filesystem = (*filesystem)(nil)
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func init() {
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fs.RegisterFilesystem(&filesystem{})
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}
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// FilesystemName is the name under which the filesystem is registered.
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// Name matches fs/sysfs/mount.c:sysfs_fs_type.name.
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const FilesystemName = "sysfs"
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// Name is the name of the file system.
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func (*filesystem) Name() string {
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return FilesystemName
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}
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// AllowUserMount allows users to mount(2) this file system.
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func (*filesystem) AllowUserMount() bool {
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return true
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}
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// AllowUserList allows this filesystem to be listed in /proc/filesystems.
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func (*filesystem) AllowUserList() bool {
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return true
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}
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// Flags returns that there is nothing special about this file system.
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//
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// In Linux, sysfs returns FS_USERNS_VISIBLE | FS_USERNS_MOUNT, see fs/sysfs/mount.c.
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func (*filesystem) Flags() fs.FilesystemFlags {
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return 0
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}
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// Mount returns a sysfs root which can be positioned in the vfs.
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func (f *filesystem) Mount(ctx context.Context, device string, flags fs.MountSourceFlags, data string, _ interface{}) (*fs.Inode, error) {
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// device is always ignored.
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// sysfs ignores data, see fs/sysfs/mount.c:sysfs_mount.
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return New(ctx, fs.NewNonCachingMountSource(ctx, f, flags)), nil
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}
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