From: Jan Kara <jack@suse.cz>
Date: Thu, 3 Apr 2014 21:46:57 +0000 (-0700)
Subject: ocfs2: avoid blocking in ocfs2_mark_lockres_freeing() in downconvert thread
X-Git-Tag: v3.15-rc1~106^2~202
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=84d86f83f9d0e8431a3c9eae4c47e9d7ff49a411;p=pandora-kernel.git

ocfs2: avoid blocking in ocfs2_mark_lockres_freeing() in downconvert thread

If we are dropping last inode reference from downconvert thread, we will
end up calling ocfs2_mark_lockres_freeing() which can block if the lock
we are freeing is queued thus creating an A-A deadlock.  Luckily, since
we are the downconvert thread, we can immediately dequeue the lock and
thus avoid waiting in this case.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Reviewed-by: Srinivas Eeda <srinivas.eeda@oracle.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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