Commit 209f7512 authored Aug 06, 2015 by Joseph Qi Committed by Linus Torvalds Aug 07, 2015

ocfs2: fix BUG in ocfs2_downconvert_thread_do_work()



The "BUG_ON(list_empty(&osb->blocked_lock_list))" in
ocfs2_downconvert_thread_do_work can be triggered in the following case:

ocfs2dc has firstly saved osb->blocked_lock_count to local varibale
processed, and then processes the dentry lockres.  During the dentry
put, it calls iput and then deletes rw, inode and open lockres from
blocked list in ocfs2_mark_lockres_freeing.  And this causes the
variable `processed' to not reflect the number of blocked lockres to be
processed, which triggers the BUG.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 4248b0da

fs/ocfs2/dlmglue.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -4025,9 +4025,13 @@ static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb)
		osb->dc_work_sequence = osb->dc_wake_sequence;

		processed = osb->blocked_lock_count;
		while (processed) {
		BUG_ON(list_empty(&osb->blocked_lock_list));

		/*
		* blocked lock processing in this loop might call iput which can
		* remove items off osb->blocked_lock_list. Downconvert up to
		* 'processed' number of locks, but stop short if we had some
		* removed in ocfs2_mark_lockres_freeing when downconverting.
		*/
		while (processed && !list_empty(&osb->blocked_lock_list)) {
		lockres = list_entry(osb->blocked_lock_list.next,
		struct ocfs2_lock_res, l_blocked_list);
		list_del_init(&lockres->l_blocked_list);

Admin message