From: Alex Elder <elder@inktank.com>
Date: Wed, 6 Feb 2013 19:11:38 +0000 (-0600)
Subject: rbd: ignore result of ceph_copy_from_page_vector()
X-Git-Tag: v3.9-rc1~41^2~21^2~1
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23ed6e13b320b33decb516cbe66e71b132df488d;p=pandora-kernel.git

rbd: ignore result of ceph_copy_from_page_vector()

The result of ceph_copy_from_page_vector() is simply the length
argument it is provided.

This is called by rbd_obj_method_sync(), which returns the result if
it's non-negative.  But we always either ignore or overwrite that
return value.  So explicitly ignore what's returned by the copy
function, and have rbd_obj_method_sync() always return either a
negative errno or 0.

We also return the result of ceph_copy_from_page_vector() in
rbd_obj_read_sync().  There we still want to return the number of
bytes transferred, but we can use the value we already have in hand
rather than what ceph_copy_from_page_vector() provides.

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