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From: Yafang Shao <laoar.shao@gmail.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>,
	Dave Chinner <david@fromorbit.com>,
	Christoph Hellwig <hch@infradead.org>,
	Michal Hocko <mhocko@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Howells <dhowells@redhat.com>,
	jlayton@redhat.com, linux-fsdevel@vger.kernel.org,
	linux-cachefs@redhat.com, linux-xfs@vger.kernel.org,
	Linux MM <linux-mm@kvack.org>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v10 4/4] xfs: use current->journal_info to avoid transaction reservation recursion
Date: Tue, 8 Dec 2020 11:03:31 +0800	[thread overview]
Message-ID: <CALOAHbCS9Np3KPh9O4TgCUCynG3yw0+z2Q9KBANE7KVS9ecazA@mail.gmail.com> (raw)
In-Reply-To: <20201208024158.GF7338@casper.infradead.org>

On Tue, Dec 8, 2020 at 10:42 AM Matthew Wilcox <willy@infradead.org> wrote:
>
> On Tue, Dec 08, 2020 at 10:15:43AM +0800, Yafang Shao wrote:
> > -     /*
> > -      * Given that we do not allow direct reclaim to call us, we should
> > -      * never be called in a recursive filesystem reclaim context.
> > -      */
> > -     if (WARN_ON_ONCE(current->flags & PF_MEMALLOC_NOFS))
> > -             goto redirty;
> > -
> >       /*
> >        * Is this page beyond the end of the file?
> >        *
> > diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> > index 2371187b7615..28db93d0da97 100644
> > --- a/fs/xfs/xfs_aops.c
> > +++ b/fs/xfs/xfs_aops.c
> > @@ -568,6 +568,16 @@ xfs_vm_writepage(
> >  {
> >       struct xfs_writepage_ctx wpc = { };
> >
> > +     /*
> > +      * Given that we do not allow direct reclaim to call us, we should
> > +      * never be called while in a filesystem transaction.
> > +      */
> > +     if (xfs_trans_context_active()) {
> > +             redirty_page_for_writepage(wbc, page);
> > +             unlock_page(page);
> > +             return 0;
> > +     }
>
> Dave specifically asked for this one to WARN too.

I put the warn in xfs_trans_context_active(), pls. see the definition of it.
Is that okay ?

-- 
Thanks
Yafang

  reply	other threads:[~2020-12-08  3:05 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-08  2:15 [PATCH v10 0/4] xfs: avoid transaction reservation recursion Yafang Shao
2020-12-08  2:15 ` [PATCH v10 1/4] mm: Add become_kswapd and restore_kswapd Yafang Shao
2020-12-08  2:15 ` [PATCH v10 2/4] xfs: use memalloc_nofs_{save,restore} in xfs transaction Yafang Shao
2020-12-08  2:46   ` Matthew Wilcox
2020-12-08  3:05     ` Yafang Shao
2020-12-08  2:15 ` [PATCH v10 3/4] xfs: refactor the usage around xfs_trans_context_{set,clear} Yafang Shao
2020-12-08  2:15 ` [PATCH v10 4/4] xfs: use current->journal_info to avoid transaction reservation recursion Yafang Shao
2020-12-08  2:41   ` Matthew Wilcox
2020-12-08  3:03     ` Yafang Shao [this message]
2020-12-08  4:20   ` Dave Chinner
2020-12-08  5:01     ` Yafang Shao

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