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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-01-05 16:02:20 -0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-01-09 17:02:27 -0800 |
| commit | 38aa0889b2504bbe68e47f51cf73bf7f0a7246bd (patch) | |
| tree | bfe9f9ed78dfd70dfec64a83a87835279ecefbf3 /fs/f2fs/f2fs.h | |
| parent | 41ef94b35c8df8e01780b4a3362246c51f3aa79b (diff) | |
| download | lwn-38aa0889b2504bbe68e47f51cf73bf7f0a7246bd.tar.gz lwn-38aa0889b2504bbe68e47f51cf73bf7f0a7246bd.zip | |
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>
Diffstat (limited to 'fs/f2fs/f2fs.h')
| -rw-r--r-- | fs/f2fs/f2fs.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 37e935a362cd..ba30218770da 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -406,7 +406,8 @@ enum { CURSEG_HOT_NODE, /* direct node blocks of directory files */ CURSEG_WARM_NODE, /* direct node blocks of normal files */ CURSEG_COLD_NODE, /* indirect node blocks */ - NO_CHECK_TYPE + NO_CHECK_TYPE, + CURSEG_DIRECT_IO, /* to use for the direct IO path */ }; struct flush_cmd { |