linux-ext4 - Re: [PATCH V11 02/19] block: introduce multi-page bvec helpers

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Date:   Thu, 22 Nov 2018 09:09:13 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>, Omar Sandoval <osandov@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Dave Chinner <dchinner@...hat.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        linux-raid@...r.kernel.org, David Sterba <dsterba@...e.com>,
        linux-btrfs@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        linux-ext4@...r.kernel.org, Coly Li <colyli@...e.de>,
        linux-bcache@...r.kernel.org, Boaz Harrosh <ooo@...ctrozaur.com>,
        Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com
Subject: Re: [PATCH V11 02/19] block: introduce multi-page bvec helpers

On Wed, Nov 21, 2018 at 05:08:11PM +0100, Christoph Hellwig wrote:
> On Wed, Nov 21, 2018 at 11:06:11PM +0800, Ming Lei wrote:
> > bvec_iter_* is used for single-page bvec in current linus tree, and there are
> > lots of users now:
> > 
> > [linux]$ git grep -n "bvec_iter_*" ./ | wc
> >     191     995   13242
> > 
> > If we have to switch it first, it can be a big change, just wondering if Jens
> > is happy with that?
> 
> Your above grep statement seems to catch every use of struct bvec_iter,
> due to the *.
> 
> Most uses of bvec_iter_ are either in the block headers, or are
> ceph wrappers that match the above and can easily be redefined.

OK, looks you are right, seems not so widely used:

$ git grep -n -w -E "bvec_iter_len|bvec_iter_bvec|bvec_iter_advance|bvec_iter_page|bvec_iter_offset" ./  | wc
     36     194    2907

I will switch to that given the effected driver are only dm, nvdimm and ceph.

Thanks,
Ming