tree bfe9f9ed78dfd70dfec64a83a87835279ecefbf3
parent 41ef94b35c8df8e01780b4a3362246c51f3aa79b
author Jaegeuk Kim <jaegeuk@kernel.org> 1420502540 -0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1420851747 -0800

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>