linux-kernel - Re: [PATCH] xfs: Use WARN_ON_ONCE rather than BUG for bailout mount-operation

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Date:   Fri, 30 Aug 2019 10:37:58 +0900
From:   Austin Kim <austindh.kim@...il.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: Use WARN_ON_ONCE rather than BUG for bailout mount-operation

2019년 8월 30일 (금) 오전 9:33, Darrick J. Wong <darrick.wong@...cle.com>님이 작성:
>
> On Fri, Aug 30, 2019 at 09:30:22AM +0900, Austin Kim wrote:
> > If the CONFIG_BUG is enabled, BUG is executed and then system is crashed.
> > However, the bailout for mount is no longer proceeding.
> >
> > For this reason, using WARN_ON_ONCE rather than BUG can prevent this situation.
> >
> > Signed-off-by: Austin Kim <austindh.kim@...il.com>
> > ---
> >  fs/xfs/xfs_mount.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> > index 322da69..c0d0b72 100644
> > --- a/fs/xfs/xfs_mount.c
> > +++ b/fs/xfs/xfs_mount.c
> > @@ -213,8 +213,7 @@ xfs_initialize_perag(
> >                       goto out_hash_destroy;
> >
> >               spin_lock(&mp->m_perag_lock);
> > -             if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
> > -                     BUG();
> > +             if (WARN_ON_ONCE(radix_tree_insert(&mp->m_perag_tree, index, pag))) {
>
> Er... please wrap the line at 80 columns.

Oh..
Let me resend patch soon after wrapping 80 column lines.

>
> --D
>
> >                       spin_unlock(&mp->m_perag_lock);
> >                       radix_tree_preload_end();
> >                       error = -EEXIST;
> > --
> > 2.6.2
> >