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[vfs2] Add FilesystemType.Release to avoid reference leaks.

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Singleton filesystem like devpts and devtmpfs have a single filesystem shared
among all mounts, so they acquire a "self-reference" when initialized that
must be released when the entire virtual filesystem is released at sandbox
exit.

PiperOrigin-RevId: 336828852
This commit is contained in:
Dean Deng
2020-10-13 01:13:22 -07:00
committed by gVisor bot
parent fc7df53222
commit 577c82f22c
18 changed files with 96 additions and 23 deletions
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pkg/sentry/fsimpl/pipefs/pipefs.go
+3
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@@ -39,6 +39,9 @@ func (filesystemType) Name() string {
return "pipefs"
}
// Release implements vfs.FilesystemType.Release.
func (filesystemType) Release(ctx context.Context) {}
// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
func (filesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
panic("pipefs.filesystemType.GetFilesystem should never be called")