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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/segment.c | |
| parent | 41ef94b35c8df8e01780b4a3362246c51f3aa79b (diff) | |
| download | linux-38aa0889b2504bbe68e47f51cf73bf7f0a7246bd.tar.gz linux-38aa0889b2504bbe68e47f51cf73bf7f0a7246bd.tar.bz2 linux-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/segment.c')
| -rw-r--r-- | fs/f2fs/segment.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 8144a30b1567..31c4e5702c7d 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1024,18 +1024,22 @@ static void allocate_segment_by_default(struct f2fs_sb_info *sbi, stat_inc_seg_type(sbi, curseg); } +static void __allocate_new_segments(struct f2fs_sb_info *sbi, int type) +{ + struct curseg_info *curseg = CURSEG_I(sbi, type); + unsigned int old_segno; + + old_segno = curseg->segno; + SIT_I(sbi)->s_ops->allocate_segment(sbi, type, true); + locate_dirty_segment(sbi, old_segno); +} + void allocate_new_segments(struct f2fs_sb_info *sbi) { - struct curseg_info *curseg; - unsigned int old_curseg; int i; - for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) { - curseg = CURSEG_I(sbi, i); - old_curseg = curseg->segno; - SIT_I(sbi)->s_ops->allocate_segment(sbi, i, true); - locate_dirty_segment(sbi, old_curseg); - } + for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) + __allocate_new_segments(sbi, i); } static const struct segment_allocation default_salloc_ops = { @@ -1148,11 +1152,18 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page, { struct sit_info *sit_i = SIT_I(sbi); struct curseg_info *curseg; + bool direct_io = (type == CURSEG_DIRECT_IO); + + type = direct_io ? CURSEG_WARM_DATA : type; curseg = CURSEG_I(sbi, type); mutex_lock(&curseg->curseg_mutex); + /* direct_io'ed data is aligned to the segment for better performance */ + if (direct_io && curseg->next_blkoff) + __allocate_new_segments(sbi, type); + *new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); /* |