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From: Randy Dunlap <rdunlap@infradead.org>
To: Jens Axboe <axboe@kernel.dk>, linux-fsdevel@vger.kernel.org
Cc: viro@zeniv.linux.org.uk, akpm@linux-foundation.org
Subject: Re: [PATCH 2/4] mpage: mpage_readpages() should submit IO as read-ahead
Date: Thu, 21 Jun 2018 10:27:35 -0700	[thread overview]
Message-ID: <ef28577f-deb5-a377-1692-5307c986ad47@infradead.org> (raw)
In-Reply-To: <20180621010725.17813-3-axboe@kernel.dk>

On 06/20/2018 06:07 PM, Jens Axboe wrote:
> a_ops->readpages() is only ever used for read-ahead, yet we don't
> flag the IO being submitted as such. Fix that up. Any file system
> that uses mpage_readpages() as its ->readpages() implementation
> will now get this right.
> 
> Since we're passing in whether the IO is read-ahead or not, we
> don't need to pass in the 'gfp' separately, as it is dependent
> on the IO being read-ahead. Kill off that member.
> 
> Add some documentation notes on ->readpages() being purely for
> read-ahead.
> 
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> ---
>  fs/f2fs/data.c     |  5 +++++
>  fs/mpage.c         | 29 +++++++++++++++++++----------
>  include/linux/fs.h |  4 ++++
>  3 files changed, 28 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 8f931d699287..b7c9b58acf3e 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1421,6 +1421,11 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
>  /*
>   * This function was originally taken from fs/mpage.c, and customized for f2fs.
>   * Major change was from block_size == page_size in f2fs by default.
> + *
> + * Note that the aops->readpages() function is ONLY used for read-ahead. If
> + * this function ever deviates from doing just read-ahead, it should either
> + * use ->readpage() or do the necessary surgery to decouple ->readpages()
> + * readom read-ahead.

      eh?

>   */


-- 
~Randy

  reply	other threads:[~2018-06-21 17:27 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-21  1:07 [PATCH v4 0/4] Submit ->readpages() " Jens Axboe
2018-06-21  1:07 ` [PATCH 1/4] mpage: add argument structure for do_mpage_readpage() Jens Axboe
2018-06-21  1:07 ` [PATCH 2/4] mpage: mpage_readpages() should submit IO as read-ahead Jens Axboe
2018-06-21 17:27   ` Randy Dunlap [this message]
2018-06-21 17:29     ` Jens Axboe
2018-06-21 18:47   ` Jaegeuk Kim
2018-06-21 19:18     ` Jens Axboe
2018-06-21 19:32       ` Jaegeuk Kim
2018-06-21 19:32         ` Jens Axboe
2018-06-21  1:07 ` [PATCH 3/4] btrfs: readpages() " Jens Axboe
2018-06-21  1:07 ` [PATCH 4/4] ext4: " Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2018-05-30 14:42 [PATCHSET v3 0/4] Submit ->readpages() " Jens Axboe
2018-05-30 14:42 ` [PATCH 2/4] mpage: mpage_readpages() should submit " Jens Axboe
2018-05-29 22:17 [PATCHSET v2 0/4] Submit ->readpages() " Jens Axboe
2018-05-29 22:17 ` [PATCH 2/4] mpage: mpage_readpages() should submit " Jens Axboe

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