[PATCH 04/10] writeback: kupdate writeback shall not stop when more io is possible

[Jens Axboe <jens.axboe@oracle.com>]

From: Wu Fengguang <fengguang.wu@intel.com>

Fix the kupdate case, which disregards wbc.more_io and stop writeback
prematurely even when there are more inodes to be synced.

wbc.more_io should always be respected.

Also remove the pages_skipped check. It will set when some page(s) of some
inode(s) cannot be written for now. Such inodes will be delayed for a while.
This variable has nothing to do with whether there are other writeable inodes.

CC: Jan Kara <jack@suse.cz>
CC: Dave Chinner <david@fromorbit.com>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
 fs/fs-writeback.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 476be9b..551684d 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -753,8 +753,8 @@ static long wb_writeback(struct bdi_writeback *wb,
 		/*
 		 * If we ran out of stuff to write, bail unless more_io got set
 		 */
-		if (wbc.nr_to_write > 0 || wbc.pages_skipped > 0) {
-			if (wbc.more_io && !wbc.for_kupdate) {
+		if (wbc.nr_to_write > 0) {
+			if (wbc.more_io) {
 				if (wbc.nr_to_write < MAX_WRITEBACK_PAGES)
 					continue;
 				/*
-- 
1.6.4.1.207.g68ea