rbd: implement full object parent reads

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As a step toward implementing layered writes, implement reading the
data for a target object from the parent image for a write request
whose target object is known to not exist.  Add a copyup_pages field
to an image request to track the page array used (only) for such a
request.

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

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Alex Elder 2013-04-19 15:34:50 -05:00 • committed by Sage Weil

parent d98df63ea7

commit 3d7efd18d9

1 changed files with 143 additions and 9 deletions

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152

drivers/block/rbd.c

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