writeback: avoid extra sync work at enqueue time

This removes writeback_control.wb_start and does more straightforward
sync livelock prevention by setting .older_than_this to prevent extra
inodes from being enqueued in the first place.

Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index c2d957fb38d3..d8e96a480850 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -26,9 +26,6 @@ struct writeback_control {
         enum writeback_sync_modes sync_mode;
         unsigned long *older_than_this; /* If !NULL, only write back inodes
                                            older than this */
-        unsigned long wb_start;         /* Time writeback_inodes_wb was
-                                           called. This is needed to avoid
-                                           extra jobs and livelock */
         long nr_to_write;               /* Write this many pages, and decrement
                                            this for each page written */
         long pages_skipped;             /* Pages which were not written */