From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Tue, 6 Jan 2015 00:02:20 +0000 (-0800)
Subject: f2fs: align direct_io'ed data to section
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~98^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=38aa0889b2504bbe68e47f51cf73bf7f0a7246bd;p=pandora-kernel.git

f2fs: align direct_io'ed data to section

This patch aligns the start block address of a file for direct io to the f2fs's
section size.

Some flash devices manage an over 4KB-sized page as a write unit, and if the
direct_io'ed data are written but not aligned to that unit, the performance can
be degraded due to the partial page copies.

Thus, since f2fs has a section that is well aligned to FTL units, we can align
the block address to the section size so that f2fs avoids this misalignment.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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