[Ocfs2-devel] [DRAFT] ocfs2: commit the transtion before goto out to avoid blocked.

[Shichangkuo <shi.changkuo@h3c.com>]

> -----Original Message-----
> From: ocfs2-devel-bounces at oss.oracle.com
> [mailto:ocfs2-devel-bounces at oss.oracle.com] On Behalf Of Darrick J. Wong
> Sent: Sunday, April 02, 2017 1:35 AM
> To: guozhonghua 02084 (Cloud)
> Cc: ocfs2-devel at oss.oracle.com
> Subject: Re: [Ocfs2-devel] [DRAFT] ocfs2: commit the transtion before goto out
> to avoid blocked.
>
> On Sat, Apr 01, 2017 at 11:42:36AM +0000, Guozhonghua wrote:
> > Hi,
> >
> > For the commit: 2b0ad0085aa47ace4756aa501274a7de0325c09c
> >
> > Mar 31 14:42:59 wy-ost209 kernel: [795291.811547] OCFS2: ERROR (device
> > dm-11): ocfs2_block_group_clear_bits: Group descriptor # 33030144 has bit
> count 32256 but claims 32294 are freed. num_bits 48 Mar 31 14:42:59
> wy-ost209 kernel: [795291.811574] File system is now read-only due to the
> potential of on-disk corruption. Please run fsck.ocfs2 once the file system is
> unmounted.
> > Mar 31 14:42:59 wy-ost209 kernel: [795291.811591]
> > (libvirtd,1223183,4):_ocfs2_free_suballoc_bits:2502 ERROR: status =
> > -30 Mar 31 14:42:59 wy-ost209 kernel: [795291.811605]
> > (libvirtd,1223183,4):_ocfs2_free_suballoc_bits:2525 ERROR: status =
> > -30 Mar 31 14:42:59 wy-ost209 kernel: [795291.811619]
> > (libvirtd,1223183,4):_ocfs2_free_clusters:2588 ERROR: status = -30 Mar
> > 31 14:42:59 wy-ost209 kernel: [795291.811632]
> > (libvirtd,1223183,4):_ocfs2_free_clusters:2597 ERROR: status = -30 Mar
> > 31 14:42:59 wy-ost209 kernel: [795291.811646]
> > (libvirtd,1223183,4):ocfs2_replay_truncate_records:5996 ERROR: status
> > = -30 Mar 31 14:42:59 wy-ost209 kernel: [795291.811660]
> > (libvirtd,1223183,4):__ocfs2_flush_truncate_log:6062 ERROR: status =
> > -30 Mar 31 14:42:59 wy-ost209 kernel: [795291.811675]
> > (libvirtd,1223183,4):ocfs2_remove_btree_range:5769 ERROR: status = -30
> > Mar 31 14:42:59 wy-ost209 kernel: [795291.811689]
> > (libvirtd,1223183,4):ocfs2_commit_truncate:7194 ERROR: status = -30
> > Mar 31 14:42:59 wy-ost209 kernel: [795291.811722]
> > (libvirtd,1223183,4):ocfs2_truncate_for_delete:607 ERROR: status = -30
> > Mar 31 14:42:59 wy-ost209 kernel: [795291.811736]
> > (libvirtd,1223183,4):ocfs2_wipe_inode:776 ERROR: status = -30 Mar 31
> > 14:42:59 wy-ost209 kernel: [795291.811746]
> > (libvirtd,1223183,4):ocfs2_delete_inode:1066 ERROR: status = -30
> >
> >
> > ocfs2_replay_truncate_records
> >     ocfs2_start_trans
> >        down_read(&osb->journal->j_trans_barrier)
> >
> >     Something is wrong, so it goes out.
> >     The ocfs2_commit_trans is not called, so up_read is not called, as to
> cause the node blocked.
> >
> >     ocfs2_commit_trans(osb, handle)
> >             up_read(&journal->j_trans_barrier)
> >
> >
> > So we have a patch to avoid it.
> >
> >
> > >From 9ae1f5550c4743356f68685276ffcddecf698e9d Mon Sep 17 00:00:00
> > >2001
> > From: guozhonghua <guozhonghua@h3c.com>
> > Date: Sat, 1 Apr 2017 19:30:54 +0800
> > Subject: [PATCH] If there is error in the function
> > ocfs2_replay_truncate_records, the function  ocfs2_commit_trans should
> > be called before return to avoid  node blocked
> >
> >
> > Signed-off-by: guozhonghua <guozhonghua@h3c.com>
> > ---
> >  fs/ocfs2/alloc.c |    2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index
> > fb15a96..dc52f7a 100644
> > --- a/fs/ocfs2/alloc.c
> > +++ b/fs/ocfs2/alloc.c
> > @@ -5953,6 +5953,7 @@ static int ocfs2_replay_truncate_records(struct
> ocfs2_super *osb,
> >                                              OCFS2_JOURNAL_ACCESS_WRITE);
> >             if (status < 0) {
> >                     mlog_errno(status);
> > +                   ocfs2_commit_trans(osb, handle);
>
> Um... if there's an error, shouldn't we /abort/ the transaction?
>
> --D

I am not familiar with jbd2, so I can't see what will happen if we abort the transaction.
After reviewed all codes carefully, I find other codes called ocfs2_start_trans, also executed ocfs2_commit_trans whether correctly or not.
I think this is a bug, please reconsidering our patch.
Thanks!

Changkuo Shi
> >                     goto bail;
> >             }
> >
> > @@ -5977,6 +5978,7 @@ static int ocfs2_replay_truncate_records(struct
> ocfs2_super *osb,
> >                                                  num_clusters);
> >                     if (status < 0) {
> >                             mlog_errno(status);
> > +                           ocfs2_commit_trans(osb, handle);
> >                             goto bail;
> >                     }
> >             }
> > --
> > 1.7.9.5
> >
> > _______________________________________________
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> > Ocfs2-devel at oss.oracle.com
> > https://oss.oracle.com/mailman/listinfo/ocfs2-devel
>
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