| Subject | Re: [PATCH 8/9] bio: add bvec_iter rewind API | From | "Martin K. Petersen" <> | Date | Wed, 19 Apr 2017 22:51:08 -0400 |
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Dmitry Monakhov <dmonakhov@openvz.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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