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From: Jens Axboe <>
Subject: [PATCHSET v2 0/4] Submit ->readpages() IO as read-ahead
Date: Tue, 29 May 2018 16:17:23 -0600	[thread overview]
Message-ID: <> (raw)

The only caller of ->readpages() is from read-ahead, yet we don't
submit IO flagged with REQ_RAHEAD. This means we don't see it in
blktrace, for instance, which is a shame. We already make assumptions
about ->readpages() just being for read-ahead in the mpage
implementation, using readahead_gfp_mask(mapping) as out GFP mask of

This small series fixes up mpage_readpages() to submit with
REQ_RAHEAD, which takes care of file systems using mpage_readpages().
The first patch is a prep patch, that makes do_mpage_readpage() take
an argument structure.

Changes since v1:

- Fix ext4_mpage_readpages() also being used for regular reads
- Add prep patch with struct arguments for do_mpage_readpage()

 fs/btrfs/extent_io.c |   2 +-
 fs/ext4/ext4.h       |   2 +-
 fs/ext4/inode.c      |   5 +-
 fs/ext4/readpage.c   |   5 +-
 fs/mpage.c           | 109 ++++++++++++++++++++++---------------------
 5 files changed, 65 insertions(+), 58 deletions(-)

Jens Axboe

             reply	other threads:[~2018-05-29 22:17 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-29 22:17 Jens Axboe [this message]
2018-05-29 22:17 ` [PATCH 1/4] mpage: add argument structure for do_mpage_readpage() Jens Axboe
2018-05-29 22:17 ` [PATCH 2/4] mpage: mpage_readpages() should submit IO as read-ahead Jens Axboe
2018-05-29 22:17 ` [PATCH 3/4] btrfs: readpages() " Jens Axboe
2018-05-29 22:17 ` [PATCH 4/4] ext4: " Jens Axboe

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