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From: Matthew Wilcox <willy@infradead.org>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: darrick.wong@oracle.com, david@fromorbit.com, hch@infradead.org,
	mhocko@kernel.org, akpm@linux-foundation.org,
	dhowells@redhat.com, jlayton@redhat.com,
	linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com,
	linux-xfs@vger.kernel.org, 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 02:41:58 +0000	[thread overview]
Message-ID: <20201208024158.GF7338@casper.infradead.org> (raw)
In-Reply-To: <20201208021543.76501-5-laoar.shao@gmail.com>

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.

  reply	other threads:[~2020-12-08  2:43 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 [this message]
2020-12-08  3:03     ` Yafang Shao
2020-12-08  4:20   ` Dave Chinner
2020-12-08  5:01     ` Yafang Shao

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