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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
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