commit 8d63e318c4eb1bea6f7e3cb4b77849eaa167bfec
author Alex Elder <elder@dreamhost.com> Wed Mar 07 11:40:08 2012 -0600
committer Alex Elder <elder@dreamhost.com> Thu Mar 22 10:47:52 2012 -0500
tree 4783d4d0ab9a5d9c17e8eb0f93b0d279ad1b879a
parent 9bd1966344bf975b5ce65e80fd6bacc41b4325a8

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>