[Ocfs2-devel] ocfs2: do not panic if ocfs2_start_trans fails

[Zhangguanghui]

Hi：
When storage network is unstable, it may trigger the panic in ocfs2_start_trans.
 ocfs2_start_trans -> ocfs2_abort ->panic，whether there is a better way to solve this problem？
Just mark as a mistake instead of ocfs2_abort.
Finally, any feedback about this process (positive or negative) would be greatly appreciated.

Callback as follows：
Jul 8 15:34:16 cvk99 kernel: [72056.516720] (o2hb-5CED29F793,5052,1):o2hb_bio_end_io:381 ERROR: IO Error -5
Jul 8 15:34:16 cvk99 kernel: [72056.516723] (o2hb-5CED29F793,5052,1):o2hb_do_disk_heartbeat:993 ERROR: status = -5
Jul 8 15:34:16 cvk99 kernel: [72056.516730] (pool,7938,6):ocfs2_commit_trans:393 ERROR: status = -5
Jul 8 15:34:16 cvk99 kernel: [72056.516733] (pool,7938,6):ocfs2_write_begin_inline:1515 ERROR: status = -30
Jul 8 15:34:16 cvk99 kernel: [72056.516735] (pool,7938,6):ocfs2_try_to_write_inline_data:1594 ERROR: status = -30
Jul 8 15:34:16 cvk99 kernel: [72056.516738] (pool,7938,6):ocfs2_write_begin_nolock:1721 ERROR: status = -30
Jul 8 15:34:16 cvk99 kernel: [72056.516741] (pool,7938,6):ocfs2_write_begin:1937 ERROR: status = -30
Jul 8 15:34:16 cvk99 kernel: [72056.516772] (pool,8052,0):ocfs2_start_trans:368 ERROR: status = -30
Jul 8 15:34:16 cvk99 kernel: [72056.516776] OCFS2: abort (device sdb): ocfs2_start_trans: Detected aborted journal

________________________________
zhangguanghui

发件人： zhangguanghui 10102<mailto:zhang.guanghui at h3c.com>
发送时间： 2015-07-06 10:29
收件人： Joseph Qi<mailto:joseph.qi at huawei.com>; Andrew Morton<mailto:akpm at linux-foundation.org>
抄送： Mark Fasheh<mailto:mfasheh at suse.com>; Joel Becker<mailto:jlbec at evilplan.org>; ocfs2-devel at oss.oracle.com<mailto:ocfs2-devel at oss.oracle.com>
主题： Re: [PATCH] ocfs2: do not BUG if buffer not uptodate in __ocfs2_journal_access

This patch is currently verified and working well for two weeks.
So it is reasonable for the case.

Finally, any feedback about this process (positive or negative) would be greatly appreciated.
________________________________
zhangguanghui

From: Joseph Qi<mailto:joseph.qi at huawei.com>
Date: 2015-07-06 10:05
To: Andrew Morton<mailto:akpm at linux-foundation.org>
CC: Mark Fasheh<mailto:mfasheh at suse.com>; Joel Becker<mailto:jlbec at evilplan.org>; zhangguanghui 10102 (CCPL)<mailto:zhang.guanghui at h3c.com>; ocfs2-devel at oss.oracle.com<mailto:ocfs2-devel at oss.oracle.com>
Subject: [PATCH] ocfs2: do not BUG if buffer not uptodate in __ocfs2_journal_access

When storage network is unstable, it may trigger the BUG in
__ocfs2_journal_access because of buffer not uptodate. We can retry the
write in this case or return error instead of BUG.

Reported-by: Zhangguanghui <zhang.guanghui at h3c.com>
Signed-off-by: Joseph Qi <joseph.qi at huawei.com>
---
 fs/ocfs2/journal.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index f8206d1..e731374 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -670,7 +670,23 @@ static int __ocfs2_journal_access(handle_t *handle,
                mlog(ML_ERROR, "giving me a buffer that's not uptodate!\n");
                mlog(ML_ERROR, "b_blocknr=%llu\n",
                     (unsigned long long)bh->b_blocknr);
-               BUG();
+
+               lock_buffer(bh);
+               /*
+                * A previous attempt to write this buffer head failed.
+                * Nothing we can do but to retry the write and hope for
+                * the best.
+                */
+               if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) {
+                       clear_buffer_write_io_error(bh);
+                       set_buffer_uptodate(bh);
+               }
+
+               if (!buffer_uptodate(bh)) {
+                       unlock_buffer(bh);
+                       return -EIO;
+               }
+               unlock_buffer(bh);
        }

        /* Set the current transaction information on the ci so
--
1.8.4.3



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