From: Sage Weil <sage@newdream.net>
Date: Tue, 9 Nov 2010 20:40:00 +0000 (-0800)
Subject: ceph: explicitly specify page alignment in network messages
X-Git-Tag: v2.6.37-rc3~2^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c5c6b19d4b8f5431fca05f28ae9e141045022149;p=pandora-kernel.git

ceph: explicitly specify page alignment in network messages

The alignment used for reading data into or out of pages used to be taken
from the data_off field in the message header.  This only worked as long
as the page alignment matched the object offset, breaking direct io to
non-page aligned offsets.

Instead, explicitly specify the page alignment next to the page vector
in the ceph_msg struct, and use that instead of the message header (which
probably shouldn't be trusted).  The alloc_msg callback is responsible for
filling in this field properly when it sets up the page vector.

Signed-off-by: Sage Weil <sage@newdream.net>
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