linux-kernel - Re: [PATCH 4.19 01/16] block: introduce multi-page bvec helpers

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Date:   Thu, 11 Nov 2021 19:53:08 +0100
From:   Pavel Machek <pavel@....cz>
To:     Zubin Mithra <zsm@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Christoph Hellwig <hch@....de>, Omar Sandoval <osandov@...com>,
        Ming Lei <ming.lei@...hat.com>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 4.19 01/16] block: introduce multi-page bvec helpers

Hi!

> > > This patch introduces helpers of 'mp_bvec_iter_*' for multi-page bvec
> > > support.
> > > 
> > > The introduced helpers treate one bvec as real multi-page segment,
> > > which may include more than one pages.
> > > 
> > > The existed helpers of bvec_iter_* are interfaces for supporting current
> > > bvec iterator which is thought as single-page by drivers, fs, dm and
> > > etc. These introduced helpers will build single-page bvec in flight, so
> > > this way won't break current bio/bvec users, which needn't any
> > > change.
> > 
> > I don't understand why we have this in 4.19-stable. I don't see
> > followup patches needing it, and it does not claim to fix a bug.
> 
> 
> There is some more context on this at:
> https://lore.kernel.org/linux-block/YXweJ00CVsDLCI7b@google.com/T/#u
> and
> https://lore.kernel.org/stable/YYVZBuDaWBKT3vOS@google.com/T/#u

Thank you!
								Pavel
								
-- 
http://www.livejournal.com/~pavelmachek

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