From: Sage Weil <sage@newdream.net>
Date: Wed, 1 Jun 2011 23:08:44 +0000 (-0700)
Subject: ceph: fix short sync reads from the OSD
X-Git-Tag: v3.0-rc3~2^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c3cd62839aaa2cdb2b99687c9e44f1b300a4aece;p=pandora-kernel.git

ceph: fix short sync reads from the OSD

If we get a short read from the OSD because the object is small, we need to
zero the remainder of the buffer.  For O_DIRECT reads, the attempted range
is not trimmed to i_size by the VFS, so we were actually looping
indefinitely.

Fix by trimming by i_size, and the unconditionally zeroing the trailing
range.

Reported-by: Jeff Wu <cpwu@tnsoft.com.cn>
Signed-off-by: Sage Weil <sage@newdream.net>
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