linux-kernel - [PATCH 00/12] block: cleanup direct access to bvec table

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Date:   Fri, 11 Nov 2016 20:05:28 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:     linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Ming Lei <tom.leiming@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Coly Li <colyli@...e.de>,
        dm-devel@...hat.com (open list:DEVICE-MAPPER (LVM)),
        drbd-dev@...ts.linbit.com (open list:DRBD DRIVER),
        Eric Wheeler <git@...ux.ewheeler.net>,
        Guoqing Jiang <gqjiang@...e.com>,
        Hannes Reinecke <hare@...e.com>, Jiri Kosina <jkosina@...e.cz>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Keith Busch <keith.busch@...el.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        linux-bcache@...r.kernel.org (open list:BCACHE (BLOCK LAYER CACHE)),
        linux-nvme@...ts.infradead.org (open list:NVM EXPRESS TARGET DRIVER),
        linux-raid@...r.kernel.org (open list:SOFTWARE RAID (Multiple Disks)
        SUPPORT), linux-scsi@...r.kernel.org (open list:TARGET SUBSYSTEM),
        logfs@...fs.org (open list:LogFS),
        Mike Christie <mchristi@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        target-devel@...r.kernel.org (open list:TARGET SUBSYSTEM),
        Yijing Wang <wangyijing@...wei.com>,
        Zheng Liu <wenqing.lz@...bao.com>
Subject: [PATCH 00/12] block: cleanup direct access to bvec table

Hi,

This patchset cleans up direct access to bvec table.

The 1st patch passes bvec table to bio_init(), so that
direct access to bvec table in bio initialization is avoided.

For other patches, most of them uses bio_add_page()
to replace hardcode style of adding page to bvec,
and others avoids to access bio->bi_vcnt.

The most special one is to use bvec iterator helpers
to implement .get_page/.next_page for dm-io.c

One big motivation is to prepare for supporting multipage
bvec, but this patchset is one good cleanup too even not
for that purpose.

Thanks,
Ming

Ming Lei (12):
  block: bio: pass bvec table to bio_init()
  block: drbd: remove impossible failure handling
  block: floppy: use bio_add_page()
  target: avoid to access .bi_vcnt directly
  bcache: debug: avoid to access .bi_io_vec directly
  dm: crypt: use bio_add_page()
  dm: use bvec iterator helpers to implement .get_page and .next_page
  dm: dm.c: replace 'bio->bi_vcnt == 1' with !bio_multiple_segments
  fs: logfs: convert to bio_add_page() in sync_request()
  fs: logfs: use bio_add_page() in __bdev_writeseg()
  fs: logfs: use bio_add_page() in do_erase()
  fs: logfs: remove unnecesary check

 block/bio.c                        |   8 ++-
 drivers/block/drbd/drbd_receiver.c |  14 +----
 drivers/block/floppy.c             |  10 ++--
 drivers/md/bcache/debug.c          |  11 ++--
 drivers/md/bcache/io.c             |   4 +-
 drivers/md/bcache/journal.c        |   4 +-
 drivers/md/bcache/movinggc.c       |   6 +--
 drivers/md/bcache/request.c        |   2 +-
 drivers/md/bcache/super.c          |  12 ++---
 drivers/md/bcache/writeback.c      |   5 +-
 drivers/md/dm-bufio.c              |   4 +-
 drivers/md/dm-crypt.c              |   8 +--
 drivers/md/dm-io.c                 |  34 ++++++++----
 drivers/md/dm-rq.c                 |   7 ++-
 drivers/md/dm.c                    |   2 +-
 drivers/md/multipath.c             |   2 +-
 drivers/md/raid5-cache.c           |   2 +-
 drivers/md/raid5.c                 |   9 +---
 drivers/nvme/target/io-cmd.c       |   4 +-
 drivers/target/target_core_pscsi.c |   8 +--
 fs/logfs/dev_bdev.c                | 106 +++++++++++++------------------------
 include/linux/bio.h                |   3 +-
 22 files changed, 107 insertions(+), 158 deletions(-)

-- 
2.7.4