[PATCH 1/2] f2fs: submit node page write bios when really required

Jaegeuk Kim
2016-03-12T00:14:43Z

If many threads calls fsync with data writes, we don't need to flush every
bios having node page writes.
The f2fs_wait_on_page_writeback will flush its bios when the page is really
needed.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/node.c | 12 +-----------
1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 771166d..118321b 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1236,7 +1236,7 @@ int sync_node_pages(struct f2fs_sb_info *sbi, nid_t ino,
pgoff_t index, end;
struct pagevec pvec;
int step = ino ? 2 : 0;
- int nwritten = 0, wrote = 0;
+ int nwritten = 0;

pagevec_init(&pvec, 0);

@@ -1326,8 +1326,6 @@ continue_unlock:

if (NODE_MAPPING(sbi)->a_ops->writepage(page, wbc))
unlock_page(page);
- else
- wrote++;

if (--wbc->nr_to_write == 0)
break;
@@ -1345,14 +1343,6 @@ continue_unlock:
step++;
goto next_step;
}
-
- if (wrote) {
- if (ino)
- f2fs_submit_merged_bio_cond(sbi, NULL, NULL,
- ino, NODE, WRITE);
- else
- f2fs_submit_merged_bio(sbi, NODE, WRITE);
- }
return nwritten;
}

--
2.6.3