From: Mark Fasheh <mark.fasheh@oracle.com>
Date: Sat, 10 Feb 2007 04:24:12 +0000 (-0800)
Subject: ocfs2: teach ocfs2_file_aio_write() about sparse files
X-Git-Tag: v2.6.22-rc1~1124^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9517bac6cc7a7aa4fee63cb38a32cb6014e264c7;p=pandora-kernel.git

ocfs2: teach ocfs2_file_aio_write() about sparse files

Unfortunately, ocfs2 can no longer make use of generic_file_aio_write_nlock()
because allocating writes will require zeroing of pages adjacent to the I/O
for cluster sizes greater than page size.

Implement a custom file write here, which can order page locks for zeroing.
This also has the advantage that cluster locks can easily be ordered outside
of the page locks.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
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