From 5df521b1eecf276c4bae8ffb7945acef45530449 Mon Sep 17 00:00:00 2001
From: Alex Elder <elder@inktank.com>
Date: Sat, 30 Mar 2013 15:09:59 -0500
Subject: [PATCH] libceph: page offset must be less than page size

Currently ceph_msg_data_pages_advance() allows the page offset value
to be PAGE_SIZE, apparently assuming ceph_msg_data_pages_next() will
treat it as 0.  But that doesn't happen, and the result led to a
helpful assertion failure.

Change ceph_msg_data_pages_advance() to truncate the offset to 0
before returning if it reaches PAGE_SIZE.

Make a few other minor adjustments in this area (comments and a
better assertion) while modifying it.

This resolves a second issue described in:
    http://tracker.ceph.com/issues/4598

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
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