block: introduce bio_clone_bioset_partial()

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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.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>

...

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Ming Lei 2017-02-14 23:28:59 +08:00 • committed by Shaohua Li

parent 26483819f8

commit c18a1e0900

2 changed files with 57 additions and 15 deletions

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61

block/bio.c

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11

include/linux/bio.h

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