linux-kernel - Re: [PATCH 0/8] block: prepare for multipage bvecs

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Date:	Tue, 29 Mar 2016 09:33:13 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Anton Altaparmakov <anton@...era.com>, xfs@....sgi.com,
	Dave Chinner <david@...morbit.com>, drbd-dev@...ts.linbit.com,
	Philipp Reisner <philipp.reisner@...bit.com>,
	Lars Ellenberg <lars.ellenberg@...bit.com>,
	Boaz Harrosh <boaz@...xistor.com>
Subject: Re: [PATCH 0/8] block: prepare for multipage bvecs

On Tue, Mar 22, 2016 at 2:12 PM, Ming Lei <ming.lei@...onical.com> wrote:
> Hi,
>
> Interests[1] have been shown in multipage bvecs, so this patchset
> try to prepare for the support and do two things:
>
> 1) the 1st 4 patches use bvec iterator to implement iterate_bvec(),
> then we can drop the non-standard way for iterating bvec
>
> 2) remove BIO_MAX_SECTORS & BIO_MAX_SIZE, and now there is only
> one user for each. Once multipage bvecs is introduced, one bio
> may hold lots of sectors, and we should always use sort of BIO_MAX_VECS
> which should be introduced in future and is similiar with current
> BIO_MAX_PAGES.
>
> xfstests(-a auto) have been run and no regression found by this
> patchset against linus v4.5+.

Hi Jens,

Looks no one objects this patchset, and the change of iov_iter.c
is a good cleanup too, so what do you think of the patchset?

Thanks,
Ming

>
>  drivers/block/drbd/drbd_int.h |  4 +--
>  fs/xfs/xfs_buf.c              |  2 +-
>  include/linux/bio.h           | 55 +------------------------------
>  include/linux/blk_types.h     |  4 +--
>  include/linux/bvec_iter.h     | 77 +++++++++++++++++++++++++++++++++++++++++++
>  lib/iov_iter.c                | 31 +++++++----------
>  6 files changed, 94 insertions(+), 79 deletions(-)
>
>
> [1], http://marc.info/?w=2&r=1&s=++[LSF%2FMM+ATTEND]+block%3A+multipage+bvecs&q=t
>
>
> Thanks,
> Ming
>