58 lines
1.9 KiB
Go
58 lines
1.9 KiB
Go
// 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 sys implements a sysfs filesystem.
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package sys
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import (
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"gvisor.googlesource.com/gvisor/pkg/sentry/context"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs/ramfs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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)
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type Dir struct {
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ramfs.Dir
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}
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func newDir(ctx context.Context, msrc *fs.MountSource, contents map[string]*fs.Inode) *fs.Inode {
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d := &Dir{}
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d.InitDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
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return fs.NewInode(d, msrc, fs.StableAttr{
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DeviceID: sysfsDevice.DeviceID(),
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InodeID: sysfsDevice.NextIno(),
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BlockSize: usermem.PageSize,
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Type: fs.SpecialDirectory,
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})
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}
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// New returns the root node of a partial simple sysfs.
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func New(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
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return newDir(ctx, msrc, map[string]*fs.Inode{
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// Add a basic set of top-level directories. In Linux, these
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// are dynamically added depending on the KConfig. Here we just
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// add the most common ones.
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"block": newDir(ctx, msrc, nil),
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"bus": newDir(ctx, msrc, nil),
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"class": newDir(ctx, msrc, nil),
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"dev": newDir(ctx, msrc, nil),
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"devices": newDir(ctx, msrc, nil),
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"firmware": newDir(ctx, msrc, nil),
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"fs": newDir(ctx, msrc, nil),
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"kernel": newDir(ctx, msrc, nil),
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"module": newDir(ctx, msrc, nil),
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"power": newDir(ctx, msrc, nil),
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})
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}
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