tree 832d6059c472d2d8777a9819a0ecb7b945167a1f
parent e36b13cceb46136d849aeee06b4907ad3570ba78
author Alex Elder <elder@dreamhost.com> 1331142008 -0600
committer Alex Elder <elder@dreamhost.com> 1332431272 -0500

libceph: get rid of zero_page_address

There's not a lot of benefit to zero_page_address, which basically
holds a mapping of the zero page through the life of the messenger
module.  Even with our own mapping, the sendpage interface where
it's used may need to kmap() it again.  It's almost certain to
be in low memory anyway.

So stop treating the zero page specially in write_partial_msg_pages()
and just get rid of zero_page_address entirely.

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