linux-kernel - Re: [PATCH v1 1/5] block: introduce bio_clone_bioset

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Message-ID: <CACVXFVM4nuf13a8PTqk_UMDNUT-p2o7oaw2E8+dk42Zg0EFTMQ@mail.gmail.com>
Date:   Wed, 15 Feb 2017 10:26:35 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Shaohua Li <shli@...nel.org>, Jens Axboe <axboe@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
        <linux-raid@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        NeilBrown <neilb@...e.com>
Subject: Re: [PATCH v1 1/5] block: introduce bio_clone_bioset_partial()

On Wed, Feb 15, 2017 at 12:01 AM, Christoph Hellwig <hch@...radead.org> wrote:
> On Tue, Feb 14, 2017 at 09:04:26AM +0800, Ming Lei wrote:
>> On Mon, Feb 13, 2017 at 9:46 PM, Christoph Hellwig <hch@...radead.org> wrote:
>> > On Fri, Feb 10, 2017 at 06:56:13PM +0800, Ming Lei wrote:
>> >> md still need bio clone(not the fast version) for behind write,
>> >> and it is more efficient to use bio_clone_bioset_partial().
>> >>
>> >> The idea is simple and just copy the bvecs range specified from
>> >> parameters.
>> >
>> > Given how few users bio_clone_bioset has I wonder if we shouldn't
>> > simply add the two new arguments to it instead of adding another
>> > indirection.
>>
>> For md write-behind, looks we have to provide the two arguments,
>> could you explain a bit how we can do that by adding another indirection?
>
> I meant to just pass the additional arguments that
> bio_clone_bioset_partial has to bio_clone_bioset.

That may cause more changes(fs, ...) into this patchset, so I suggest to
do that in another patchset, especially after we confirmed current
users of bio_clone is absolutely necessary, and I will check if other bio_clone
can be converted to fast clone.


Thanks,
Ming Lei