f2fs: align direct_io'ed data to section

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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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This commit is contained in:

Jaegeuk Kim 2015-01-05 16:02:20 -08:00

parent 41ef94b35c

commit 38aa0889b2

3 changed files with 26 additions and 11 deletions

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7

fs/f2fs/data.c

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3

fs/f2fs/f2fs.h

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27

fs/f2fs/segment.c

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