linux-kernel - Re: [PATCH v2] f2fs: fix retry logic in f2fs_write_cache

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Message-ID: <d233cbc9-99e6-ea06-b138-8c8adcdc02b6@huawei.com>
Date:   Wed, 3 Jun 2020 14:59:26 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Sahitya Tummala <stummala@...eaurora.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] f2fs: fix retry logic in f2fs_write_cache_pages()

On 2020/6/2 20:41, Sahitya Tummala wrote:
> In case a compressed file is getting overwritten, the current retry
> logic doesn't include the current page to be retried now as it sets
> the new start index as 0 and new end index as writeback_index - 1.
> This causes the corresponding cluster to be uncompressed and written
> as normal pages without compression. Fix this by allowing writeback to
> be retried for the current page as well (in case of compressed page
> getting retried due to index mismatch with cluster index). So that
> this cluster can be written compressed in case of overwrite.
> 
> Also, align f2fs_write_cache_pages() according to the change -
> <64081362e8ff>("mm/page-writeback.c: fix range_cyclic writeback vs
> writepages deadlock").
> 
> Signed-off-by: Sahitya Tummala <stummala@...eaurora.org>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,