From: Alex Elder <elder@dreamhost.com>
Date: Wed, 7 Mar 2012 17:40:08 +0000 (-0600)
Subject: libceph: use kernel_sendpage() for sending zeroes
X-Git-Tag: v3.4-rc1~76^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=31739139f3ed7be802dd9019ec8d8cc910e3d241;p=pandora-kernel.git

libceph: use kernel_sendpage() for sending zeroes

If a message queued for send gets revoked, zeroes are sent over the
wire instead of any unsent data.  This is done by constructing a
message and passing it to kernel_sendmsg() via ceph_tcp_sendmsg().

Since we are already working with a page in this case we can use
the sendpage interface instead.  Create a new ceph_tcp_sendpage()
helper that sets up flags to match the way ceph_tcp_sendmsg()
does now.

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

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