mirror of
https://github.com/netbirdio/gvisor.git
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86 lines
2.9 KiB
Go
86 lines
2.9 KiB
Go
// Copyright 2021 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 mqfs
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/errors/linuxerr"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
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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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// rootInode represents inode for filesystem's root directory (/dev/mqueue).
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//
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// +stateify savable
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type rootInode struct {
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rootInodeRefs
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kernfs.InodeAlwaysValid
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kernfs.InodeAnonymous
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kernfs.InodeAttrs
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kernfs.InodeDirectoryNoNewChildren
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kernfs.InodeNotSymlink
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kernfs.InodeTemporary
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kernfs.InodeWatches
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kernfs.OrderedChildren
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kernfs.InodeFSOwned
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locks vfs.FileLocks
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}
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var _ kernfs.Inode = (*rootInode)(nil)
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// newRootInode returns a new, initialized rootInode.
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func (fs *filesystem) newRootInode(ctx context.Context, creds *auth.Credentials) kernfs.Inode {
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inode := &rootInode{}
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inode.InodeAttrs.Init(ctx, creds, linux.UNNAMED_MAJOR, fs.devMinor, fs.NextIno(), linux.ModeDirectory|linux.FileMode(0555))
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inode.OrderedChildren.Init(kernfs.OrderedChildrenOptions{Writable: true})
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inode.InitRefs()
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return inode
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}
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// Open implements kernfs.Inode.Open.
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func (i *rootInode) Open(ctx context.Context, rp *vfs.ResolvingPath, d *kernfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
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fd, err := kernfs.NewGenericDirectoryFD(rp.Mount(), d, &i.OrderedChildren, &i.locks, &opts, kernfs.GenericDirectoryFDOptions{
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SeekEnd: kernfs.SeekEndZero,
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})
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if err != nil {
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return nil, err
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}
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return fd.VFSFileDescription(), nil
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}
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// DecRef implements kernfs.Inode.DecRef.
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func (i *rootInode) DecRef(ctx context.Context) {
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i.rootInodeRefs.DecRef(func() { i.Destroy(ctx) })
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}
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// Rename implements Inode.Rename and overrides OrderedChildren.Rename. mqueue
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// filesystem allows files to be unlinked, but not renamed.
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func (i *rootInode) Rename(ctx context.Context, oldname, newname string, child, dstDir kernfs.Inode) error {
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return linuxerr.EPERM
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}
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// SetStat implements kernfs.Inode.SetStat not allowing inode attributes to be changed.
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func (*rootInode) SetStat(context.Context, *vfs.Filesystem, *auth.Credentials, vfs.SetStatOptions) error {
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return linuxerr.EPERM
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}
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// StatFS implements kernfs.Inode.StatFS.
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func (*rootInode) StatFS(context.Context, *vfs.Filesystem) (linux.Statfs, error) {
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return vfs.GenericStatFS(linux.MQUEUE_MAGIC), nil
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}
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