diff options
author | gVisor bot <gvisor-bot@google.com> | 2021-10-26 19:03:21 +0000 |
---|---|---|
committer | gVisor bot <gvisor-bot@google.com> | 2021-10-26 19:03:21 +0000 |
commit | 1cf8a412c893de6e20562d01fbdb086f5778d77e (patch) | |
tree | 9d86c5a1c14dc1a5a85307ace8649449666e08d7 | |
parent | ed29acdbd826b3250f757ed11ee8b1b355b2f724 (diff) | |
parent | 763d7e6e396d8d4c67d650e02bd2350b22606ada (diff) |
Merge release-20211019.0-40-g763d7e6e3 (automated)
-rw-r--r-- | pkg/sentry/fsimpl/mqfs/mqfs.go | 5 | ||||
-rw-r--r-- | pkg/sentry/fsimpl/mqfs/mqfs_state_autogen.go | 32 | ||||
-rw-r--r-- | pkg/sentry/fsimpl/mqfs/registry.go | 23 | ||||
-rw-r--r-- | pkg/sentry/fsimpl/mqfs/root.go | 9 | ||||
-rw-r--r-- | pkg/sentry/vfs/filesystem_type.go | 2 |
5 files changed, 13 insertions, 58 deletions
diff --git a/pkg/sentry/fsimpl/mqfs/mqfs.go b/pkg/sentry/fsimpl/mqfs/mqfs.go index c2b53c9d0..9b3704217 100644 --- a/pkg/sentry/fsimpl/mqfs/mqfs.go +++ b/pkg/sentry/fsimpl/mqfs/mqfs.go @@ -75,6 +75,7 @@ func (ft FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualF impl.fs.MaxCachedDentries = maxCachedDentries impl.fs.VFSFilesystem().IncRef() + impl.root.IncRef() return impl.fs.VFSFilesystem(), impl.root.VFSDentry(), nil } @@ -100,10 +101,6 @@ func maxCachedDentries(ctx context.Context, mopts map[string]string) (_ uint64, type filesystem struct { kernfs.Filesystem devMinor uint32 - - // root is the filesystem's root dentry. Since we take a reference on it in - // GetFilesystem, we should release it when the fs is released. - root *kernfs.Dentry } // Release implements vfs.FilesystemImpl.Release. diff --git a/pkg/sentry/fsimpl/mqfs/mqfs_state_autogen.go b/pkg/sentry/fsimpl/mqfs/mqfs_state_autogen.go index d6154efc3..32905c2cb 100644 --- a/pkg/sentry/fsimpl/mqfs/mqfs_state_autogen.go +++ b/pkg/sentry/fsimpl/mqfs/mqfs_state_autogen.go @@ -35,7 +35,6 @@ func (fs *filesystem) StateFields() []string { return []string{ "Filesystem", "devMinor", - "root", } } @@ -46,7 +45,6 @@ func (fs *filesystem) StateSave(stateSinkObject state.Sink) { fs.beforeSave() stateSinkObject.Save(0, &fs.Filesystem) stateSinkObject.Save(1, &fs.devMinor) - stateSinkObject.Save(2, &fs.root) } func (fs *filesystem) afterLoad() {} @@ -55,7 +53,6 @@ func (fs *filesystem) afterLoad() {} func (fs *filesystem) StateLoad(stateSourceObject state.Source) { stateSourceObject.Load(0, &fs.Filesystem) stateSourceObject.Load(1, &fs.devMinor) - stateSourceObject.Load(2, &fs.root) } func (q *queueInode) StateTypeName() string { @@ -170,7 +167,6 @@ func (i *rootInode) StateFields() []string { "InodeNotSymlink", "InodeTemporary", "OrderedChildren", - "implStatFS", "locks", } } @@ -187,8 +183,7 @@ func (i *rootInode) StateSave(stateSinkObject state.Sink) { stateSinkObject.Save(4, &i.InodeNotSymlink) stateSinkObject.Save(5, &i.InodeTemporary) stateSinkObject.Save(6, &i.OrderedChildren) - stateSinkObject.Save(7, &i.implStatFS) - stateSinkObject.Save(8, &i.locks) + stateSinkObject.Save(7, &i.locks) } func (i *rootInode) afterLoad() {} @@ -202,29 +197,7 @@ func (i *rootInode) StateLoad(stateSourceObject state.Source) { stateSourceObject.Load(4, &i.InodeNotSymlink) stateSourceObject.Load(5, &i.InodeTemporary) stateSourceObject.Load(6, &i.OrderedChildren) - stateSourceObject.Load(7, &i.implStatFS) - stateSourceObject.Load(8, &i.locks) -} - -func (i *implStatFS) StateTypeName() string { - return "pkg/sentry/fsimpl/mqfs.implStatFS" -} - -func (i *implStatFS) StateFields() []string { - return []string{} -} - -func (i *implStatFS) beforeSave() {} - -// +checklocksignore -func (i *implStatFS) StateSave(stateSinkObject state.Sink) { - i.beforeSave() -} - -func (i *implStatFS) afterLoad() {} - -// +checklocksignore -func (i *implStatFS) StateLoad(stateSourceObject state.Source) { + stateSourceObject.Load(7, &i.locks) } func (r *rootInodeRefs) StateTypeName() string { @@ -258,6 +231,5 @@ func init() { state.Register((*queueFD)(nil)) state.Register((*RegistryImpl)(nil)) state.Register((*rootInode)(nil)) - state.Register((*implStatFS)(nil)) state.Register((*rootInodeRefs)(nil)) } diff --git a/pkg/sentry/fsimpl/mqfs/registry.go b/pkg/sentry/fsimpl/mqfs/registry.go index c8fbe4d33..e470ffadc 100644 --- a/pkg/sentry/fsimpl/mqfs/registry.go +++ b/pkg/sentry/fsimpl/mqfs/registry.go @@ -57,16 +57,19 @@ func NewRegistryImpl(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds * return nil, err } - var dentry kernfs.Dentry fs := &filesystem{ devMinor: devMinor, - root: &dentry, } fs.VFSFilesystem().Init(vfsObj, &FilesystemType{}, fs) vfsfs := fs.VFSFilesystem() + // NewDisconnectedMount will obtain a ref on dentry and vfsfs which is + // transferred to mount. vfsfs was initiated with 1 ref already. So get rid + // of the extra ref. + defer vfsfs.DecRef(ctx) + // dentry is initialized with 1 ref which is transferred to fs. + var dentry kernfs.Dentry dentry.InitRoot(&fs.Filesystem, fs.newRootInode(ctx, creds)) - defer vfsfs.DecRef(ctx) // NewDisconnectedMount will obtain a ref on success. mount, err := vfsObj.NewDisconnectedMount(vfsfs, dentry.VFSDentry(), &vfs.MountOptions{}) if err != nil { @@ -82,7 +85,7 @@ func NewRegistryImpl(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds * // Get implements mq.RegistryImpl.Get. func (r *RegistryImpl) Get(ctx context.Context, name string, access mq.AccessType, block bool, flags uint32) (*vfs.FileDescription, bool, error) { - inode, err := r.lookup(ctx, name) + inode, err := r.root.Inode().(*rootInode).Lookup(ctx, name) if err != nil { return nil, false, nil } @@ -120,7 +123,7 @@ func (r *RegistryImpl) Unlink(ctx context.Context, name string) error { } root := r.root.Inode().(*rootInode) - inode, err := r.lookup(ctx, name) + inode, err := root.Lookup(ctx, name) if err != nil { return err } @@ -133,16 +136,6 @@ func (r *RegistryImpl) Destroy(ctx context.Context) { r.mount.DecRef(ctx) } -// lookup retreives a kernfs.Inode using a name. -func (r *RegistryImpl) lookup(ctx context.Context, name string) (kernfs.Inode, error) { - inode := r.root.Inode().(*rootInode) - lookup, err := inode.Lookup(ctx, name) - if err != nil { - return nil, err - } - return lookup, nil -} - // newFD returns a new file description created using the given queue and inode. func (r *RegistryImpl) newFD(q *mq.Queue, inode *queueInode, access mq.AccessType, block bool, flags uint32) (*vfs.FileDescription, error) { view, err := mq.NewView(q, access, block) diff --git a/pkg/sentry/fsimpl/mqfs/root.go b/pkg/sentry/fsimpl/mqfs/root.go index 37b5749fb..922e669e2 100644 --- a/pkg/sentry/fsimpl/mqfs/root.go +++ b/pkg/sentry/fsimpl/mqfs/root.go @@ -34,7 +34,6 @@ type rootInode struct { kernfs.InodeNotSymlink kernfs.InodeTemporary kernfs.OrderedChildren - implStatFS locks vfs.FileLocks } @@ -77,13 +76,7 @@ func (*rootInode) SetStat(context.Context, *vfs.Filesystem, *auth.Credentials, v return linuxerr.EPERM } -// implStatFS provides an implementation of kernfs.Inode.StatFS for message -// queues to be embedded in inodes. -// -// +stateify savable -type implStatFS struct{} - // StatFS implements kernfs.Inode.StatFS. -func (*implStatFS) StatFS(context.Context, *vfs.Filesystem) (linux.Statfs, error) { +func (*rootInode) StatFS(context.Context, *vfs.Filesystem) (linux.Statfs, error) { return vfs.GenericStatFS(linux.MQUEUE_MAGIC), nil } diff --git a/pkg/sentry/vfs/filesystem_type.go b/pkg/sentry/vfs/filesystem_type.go index 9d54cc4ed..70d6eb85e 100644 --- a/pkg/sentry/vfs/filesystem_type.go +++ b/pkg/sentry/vfs/filesystem_type.go @@ -28,7 +28,7 @@ import ( type FilesystemType interface { // GetFilesystem returns a Filesystem configured by the given options, // along with its mount root. A reference is taken on the returned - // Filesystem and Dentry. + // Filesystem and Dentry whose ownership is transferred to the caller. GetFilesystem(ctx context.Context, vfsObj *VirtualFilesystem, creds *auth.Credentials, source string, opts GetFilesystemOptions) (*Filesystem, *Dentry, error) // Name returns the name of this FilesystemType. |