rbd: introduce OWN_BVECS data type

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If the layout is "fancy", we need to be able to rearrange the provided
bio_vecs in stripe unit chunks to make it possible for the messenger to
read/write directly from/to the provided data buffer, without employing
a temporary data buffer for assembling the result.

Higher level bio_vec arrays are generally immutable, so this requires
copying into a private array.  Only the bio_vecs themselves are shuffled
around, not the actual data.  OWN_BVECS doesn't own any pages.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

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Ilya Dryomov 2018-02-06 19:26:35 +01:00

parent e93aca0abb

commit afb978884c

1 changed files with 149 additions and 7 deletions

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166

drivers/block/rbd.c

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