f2fs: submit bio at the reclaim path

If f2fs_write_data_page is called through the reclaim path, we should submit
the bio right away.

This patch resolves the following issue that Marc Dietrich reported.
"It took me a while to bisect a problem which causes my ARM (tegra2) netbook to
frequently stall for 5-10 seconds when I enable EXA acceleration (opentegra
experimental ddx)."
And this patch fixes that.

Reported-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 150c12ace4af..0147de7e3973 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -833,6 +833,8 @@ out:
         unlock_page(page);
         if (need_balance_fs)
                 f2fs_balance_fs(sbi);
+        if (wbc->for_reclaim)
+                f2fs_submit_merged_bio(sbi, DATA, WRITE);
         return 0;
 
 redirty_out: