commit c3cd62839aaa2cdb2b99687c9e44f1b300a4aece
author Sage Weil <sage@newdream.net> Wed Jun 01 16:08:44 2011 -0700
committer Sage Weil <sage@newdream.net> Tue Jun 07 21:34:14 2011 -0700
tree fc7823426f29f44911c93394fb8a3e43d0c91846
parent 2584547230ae49b8de91ab3bb5e0a81898905b45

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>