From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 3 Feb 2014 22:07:03 +0000 (-0500)
Subject: introduce copy_page_to_iter, kill loop over iovec in generic_file_aio_read()
X-Git-Tag: v3.15-rc1~16^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e58e79db8a1;p=pandora-kernel.git

introduce copy_page_to_iter, kill loop over iovec in generic_file_aio_read()

generic_file_aio_read() was looping over the target iovec, with loop over
(source) pages nested inside that.  Just set an iov_iter up and pass *that*
to do_generic_file_aio_read().  With copy_page_to_iter() doing all work
of mapping and copying a page to iovec and advancing iov_iter.

Switch shmem_file_aio_read() to the same and kill file_read_actor(), while
we are at it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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