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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>
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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fs/f2fs/segment.c
+19 -8
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@@ -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);
/*