From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx185.postini.com [74.125.245.185]) by kanga.kvack.org (Postfix) with SMTP id 41D4A6B0034 for ; Mon, 8 Jul 2013 02:34:29 -0400 (EDT) From: Dave Chinner Subject: [PATCH] [MMOTM] xfs: fix dquot isolation hang Date: Mon, 8 Jul 2013 16:34:21 +1000 Message-Id: <1373265261-30314-1-git-send-email-david@fromorbit.com> Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org Cc: xfs@oss.sgi.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, glommer@openvz.org, mhocko@suze.cz From: Dave Chinner The new LRU list isolation code in xfs_qm_dquot_isolate() isn't completely up to date. Firstly, it needs conversion to return enum lru_status values, not raw numbers. Secondly - most importantly - it fails to unlock the dquot and relock the LRU in the LRU_RETRY path. This leads to deadlocks in xfstests generic/232. Fix them. Signed-off-by: Dave Chinner --- fs/xfs/xfs_qm.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c index 46743cf..a10a720 100644 --- a/fs/xfs/xfs_qm.c +++ b/fs/xfs/xfs_qm.c @@ -659,7 +659,7 @@ xfs_qm_dquot_isolate( trace_xfs_dqreclaim_want(dqp); list_del_init(&dqp->q_lru); XFS_STATS_DEC(xs_qm_dquot_unused); - return 0; + return LRU_REMOVED; } /* @@ -705,17 +705,19 @@ xfs_qm_dquot_isolate( XFS_STATS_DEC(xs_qm_dquot_unused); trace_xfs_dqreclaim_done(dqp); XFS_STATS_INC(xs_qm_dqreclaims); - return 0; + return LRU_REMOVED; out_miss_busy: trace_xfs_dqreclaim_busy(dqp); XFS_STATS_INC(xs_qm_dqreclaim_misses); - return 2; + return LRU_SKIP; out_unlock_dirty: trace_xfs_dqreclaim_busy(dqp); XFS_STATS_INC(xs_qm_dqreclaim_misses); - return 3; + xfs_dqunlock(dqp); + spin_lock(lru_lock); + return LRU_RETRY; } static unsigned long -- 1.8.3.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org