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// Copyright 2018 Google LLC
//
// 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 sys implements a sysfs filesystem.
package sys
import (
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/ramfs"
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
)
// sys is a root sys node.
//
// +stateify savable
type sys struct {
ramfs.Dir
}
func newFile(node fs.InodeOperations, msrc *fs.MountSource) *fs.Inode {
sattr := fs.StableAttr{
DeviceID: sysfsDevice.DeviceID(),
InodeID: sysfsDevice.NextIno(),
BlockSize: usermem.PageSize,
Type: fs.SpecialFile,
}
return fs.NewInode(node, msrc, sattr)
}
func newDir(ctx context.Context, msrc *fs.MountSource, contents map[string]*fs.Inode) *fs.Inode {
d := &sys{}
d.InitDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
return fs.NewInode(d, msrc, fs.StableAttr{
DeviceID: sysfsDevice.DeviceID(),
InodeID: sysfsDevice.NextIno(),
BlockSize: usermem.PageSize,
Type: fs.SpecialDirectory,
})
}
// New returns the root node of a partial simple sysfs.
func New(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
return newDir(ctx, msrc, map[string]*fs.Inode{
// Add a basic set of top-level directories. In Linux, these
// are dynamically added depending on the KConfig. Here we just
// add the most common ones.
"block": newDir(ctx, msrc, nil),
"bus": newDir(ctx, msrc, nil),
"class": newDir(ctx, msrc, map[string]*fs.Inode{
"power_supply": newDir(ctx, msrc, nil),
}),
"dev": newDir(ctx, msrc, nil),
"devices": newDevicesDir(ctx, msrc),
"firmware": newDir(ctx, msrc, nil),
"fs": newDir(ctx, msrc, nil),
"kernel": newDir(ctx, msrc, nil),
"module": newDir(ctx, msrc, nil),
"power": newDir(ctx, msrc, nil),
})
}
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