libceph, rbd: new bio handling code (aka don't clone bios)

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The reason we clone bios is to be able to give each object request
(and consequently each ceph_osd_data/ceph_msg_data item) its own
pointer to a (list of) bio(s).  The messenger then initializes its
cursor with cloned bio's ->bi_iter, so it knows where to start reading
from/writing to.  That's all the cloned bios are used for: to determine
each object request's starting position in the provided data buffer.

Introduce ceph_bio_iter to do exactly that -- store position within bio
list (i.e. pointer to bio) + position within that bio (i.e. bvec_iter).

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

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Ilya Dryomov 2018-01-20 10:30:10 +01:00

parent a1fbb5e7bb

commit 5359a17d27

5 changed files with 139 additions and 112 deletions

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59

include/linux/ceph/messenger.h

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11

include/linux/ceph/osd_client.h

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