From: Alex Elder <elder@dreamhost.com>
Date: Wed, 7 Mar 2012 17:40:08 +0000 (-0600)
Subject: libceph: isolate kmap() call in write_partial_msg_pages()
X-Git-Tag: v3.4-rc1~76^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8d63e318c4eb1bea6f7e3cb4b77849eaa167bfec;p=pandora-kernel.git

libceph: isolate kmap() call in write_partial_msg_pages()

In write_partial_msg_pages(), every case now does an identical call
to kmap(page).  Instead, just call it once inside the CRC-computing
block where it's needed.  Move the definition of kaddr inside that
block, and make it a (char *) to ensure portable pointer arithmetic.

We still don't kunmap() it until after the sendpage() call, in case
that also ends up needing to use the mapping.

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