70 lines
2.2 KiB
Go
70 lines
2.2 KiB
Go
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// Copyright 2019 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 proc implements a partial in-memory file system for procfs.
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package proc
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import (
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"fmt"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/context"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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// procFSType is the factory class for procfs.
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//
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// +stateify savable
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type procFSType struct{}
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var _ vfs.FilesystemType = (*procFSType)(nil)
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// GetFilesystem implements vfs.FilesystemType.
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func (ft *procFSType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
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k := kernel.KernelFromContext(ctx)
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if k == nil {
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return nil, nil, fmt.Errorf("procfs requires a kernel")
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}
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pidns := kernel.PIDNamespaceFromContext(ctx)
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if pidns == nil {
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return nil, nil, fmt.Errorf("procfs requires a PID namespace")
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}
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procfs := &kernfs.Filesystem{}
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procfs.VFSFilesystem().Init(vfsObj, procfs)
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_, dentry := newTasksInode(procfs, k, pidns)
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return procfs.VFSFilesystem(), dentry.VFSDentry(), nil
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}
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// dynamicInode is an overfitted interface for common Inodes with
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// dynamicByteSource types used in procfs.
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type dynamicInode interface {
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kernfs.Inode
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vfs.DynamicBytesSource
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Init(creds *auth.Credentials, ino uint64, data vfs.DynamicBytesSource, perm linux.FileMode)
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}
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func newDentry(creds *auth.Credentials, ino uint64, perm linux.FileMode, inode dynamicInode) *kernfs.Dentry {
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inode.Init(creds, ino, inode, perm)
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d := &kernfs.Dentry{}
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d.Init(inode)
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return d
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}
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