Hi Mark, On 12/15/2015 03:18 AM, Mark Fasheh wrote: > On Mon, Dec 14, 2015 at 02:03:17PM +0800, Junxiao Bi wrote: >>> Second, this issue can be reproduced in old Linux kernels (e.g. 3.16.7-24)? >>> there should not be any regression issue? >> Maybe just hard to reproduce, ocfs2 supports recursive locking. > > In what sense? The DLM might but the FS should never be making use of such a > mechanism (it would be for userspace users). See commit 743b5f1434f5 ("ocfs2: take inode lock in ocfs2_iop_set/get_acl()"), it used recursive locking and caused a deadlock, the call trace is in this patch's log. > > We really can't add recursive locks without this getting rejected upstream. > There's a whole slew of reasons why we don't like those in the kernel. Is there any harm to support this lock in kernel?
Thanks, Junxiao. > --Mark > > -- > Mark Fasheh > _______________________________________________ Ocfs2-devel mailing list Ocfs2-devel@oss.oracle.com https://oss.oracle.com/mailman/listinfo/ocfs2-devel