linux-kernel - Re: [PATCH 8/9] bio: add bvec

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Date:   Wed, 19 Apr 2017 22:51:08 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        martin.petersen@...cle.com
Subject: Re: [PATCH 8/9] bio: add bvec_iter rewind API

Dmitry Monakhov <dmonakhov@...nvz.org> writes:

Dmitry,

> Some ->bi_end_io handlers (for example: pi_verify or decrypt handlers)
> need to know original data vector, but after bio traverse io-stack it
> may be advanced, splited and relocated many times so it is hard to
> guess original iterator. Let's add 'bi_done' conter which accounts
> number of bytes iterator was advanced during it's evolution. Later
> end_io handler may easily restore original iterator by rewinding
> iterator to iter->bi_done.

Originally, the original integrity bip was immutable. Any slicing and
dicing was exclusively done on clones. And therefore the original bip
was always suitable for use with verify.

-- 
Martin K. Petersen	Oracle Linux Engineering