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>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 8144a30..31c4e57 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1024,18 +1024,22 @@
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 @@
{
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);
/*