libceph: separate read and write data

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An osd request defines information about where data to be read
should be placed as well as where data to write comes from.
Currently these are represented by common fields.

Keep information about data for writing separate from data to be
read by splitting these into data_in and data_out fields.

This is the key patch in this whole series, in that it actually
identifies which osd requests generate outgoing data and which
generate incoming data.  It's less obvious (currently) that an osd
CALL op generates both outgoing and incoming data; that's the focus
of some upcoming work.

This resolves:
    http://tracker.ceph.com/issues/4127

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

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Alex Elder 2013-02-14 12:16:43 -06:00 • committed by Sage Weil

parent 2ac2b7a6d4

commit 0fff87ec79

5 changed files with 105 additions and 78 deletions

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18

drivers/block/rbd.c

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