This prevents it to stuck with some very old but busy inodes,
and to give newer expired inodes a fair chance.
CC: Jan Kara <jack@xxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
fs/fs-writeback.c | 3 +++
1 file changed, 3 insertions(+)
--- linux.orig/fs/fs-writeback.c 2009-10-06 23:39:31.000000000 +0800
+++ linux/fs/fs-writeback.c 2009-10-06 23:39:32.000000000 +0800
@@ -829,6 +829,9 @@ static long wb_writeback(struct bdi_writ
args->nr_pages -= nr;
wrote += nr;
+ if (args->for_kupdate && list_empty(&wb->b_io))
+ oldest_jif = jiffies - expire_interval;
+
if (args->for_background && expire_interval &&
++fg_rounds && list_empty(&wb->b_io)) {
if (fg_rounds < 10)
--
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