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From: Christoph Hellwig <hch@infradead.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	hch@infradead.org, akpm@linux-foundation.org
Subject: Re: [PATCH 2/3] mm: use filemap_range_needs_writeback() for O_DIRECT reads
Date: Tue, 9 Feb 2021 07:48:14 +0000	[thread overview]
Message-ID: <20210209074814.GB1696555@infradead.org> (raw)
In-Reply-To: <20210209023008.76263-3-axboe@kernel.dk>

On Mon, Feb 08, 2021 at 07:30:07PM -0700, Jens Axboe wrote:
> For the generic page cache read helper, use the better variant of checking
> for the need to call filemap_write_and_wait_range() when doing O_DIRECT
> reads. This avoids falling back to the slow path for IOCB_NOWAIT, if there
> are no pages to wait for (or write out).
> 
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> ---
>  mm/filemap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 6a58d50fbd31..c80acb80e8f7 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -2643,8 +2643,8 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
>  
>  		size = i_size_read(inode);
>  		if (iocb->ki_flags & IOCB_NOWAIT) {
> -			if (filemap_range_has_page(mapping, iocb->ki_pos,
> -						   iocb->ki_pos + count - 1))
> +			if (filemap_range_needs_writeback(mapping, iocb->ki_pos,
> +							  iocb->ki_pos + count - 1))

Please avoid the overy long line, which is trivial to do by using the
normal two tab indent for the continuation.

  reply	other threads:[~2021-02-09  7:49 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-09  2:30 [PATCHSET v2 0/3] Improve IOCB_NOWAIT " Jens Axboe
2021-02-09  2:30 ` [PATCH 1/3] mm: provide filemap_range_needs_writeback() helper Jens Axboe
2021-02-09  7:47   ` Christoph Hellwig
2021-02-09 14:30     ` Jens Axboe
2021-02-09  2:30 ` [PATCH 2/3] mm: use filemap_range_needs_writeback() for O_DIRECT reads Jens Axboe
2021-02-09  7:48   ` Christoph Hellwig [this message]
2021-02-09 14:27     ` Jens Axboe
2021-02-09  2:30 ` [PATCH 3/3] iomap: " Jens Axboe
2021-02-09  7:51   ` Christoph Hellwig
2021-02-09 14:29     ` Jens Axboe
2021-02-09 19:55 ` [PATCHSET v2 0/3] Improve IOCB_NOWAIT " Andrew Morton
2021-02-09 20:11   ` Jens Axboe
2021-02-10  8:07     ` Sedat Dilek
2021-02-10  8:07       ` Sedat Dilek
2021-02-10 14:47       ` Jens Axboe
2021-02-24 16:44 [PATCHSET v3 " Jens Axboe
2021-02-24 16:44 ` [PATCH 2/3] mm: use filemap_range_needs_writeback() for " Jens Axboe
2021-02-24 16:57   ` Matthew Wilcox
2021-02-24 17:23   ` Jan Kara

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