1 files changed, 14 insertions, 18 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 707d0dc6da0f..123bcef13e51 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -48,7 +48,6 @@ static struct timer_list sync_supers_timer;
 
 static int bdi_sync_supers(void *);
 static void sync_supers_timer_fn(unsigned long);
-static void arm_supers_timer(void);
 
 static void bdi_add_default_flusher_task(struct backing_dev_info *bdi);
 
@@ -105,15 +104,13 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
                    "b_more_io:        %8lu\n"
                    "bdi_list:         %8u\n"
                    "state:            %8lx\n"
-                   "wb_mask:          %8lx\n"
-                   "wb_list:          %8u\n"
-                   "wb_cnt:           %8u\n",
+                   "wb_list:          %8u\n",
                    (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
                    (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
                    K(bdi_thresh), K(dirty_thresh),
                    K(background_thresh), nr_wb, nr_dirty, nr_io, nr_more_io,
-                   !list_empty(&bdi->bdi_list), bdi->state, bdi->wb_mask,
-                   !list_empty(&bdi->wb_list), bdi->wb_cnt);
+                   !list_empty(&bdi->bdi_list), bdi->state,
+                   !list_empty(&bdi->wb_list));
 #undef K
 
         return 0;
@@ -252,7 +249,7 @@ static int __init default_bdi_init(void)
 
         init_timer(&sync_supers_timer);
         setup_timer(&sync_supers_timer, sync_supers_timer_fn, 0);
-        arm_supers_timer();
+        bdi_arm_supers_timer();
 
         err = bdi_init(&default_backing_dev_info);
         if (!err)
@@ -341,14 +338,13 @@ int bdi_has_dirty_io(struct backing_dev_info *bdi)
 static void bdi_flush_io(struct backing_dev_info *bdi)
 {
         struct writeback_control wbc = {
-                .bdi                    = bdi,
                 .sync_mode              = WB_SYNC_NONE,
                 .older_than_this        = NULL,
                 .range_cyclic           = 1,
                 .nr_to_write            = 1024,
         };
 
-        writeback_inodes_wbc(&wbc);
+        writeback_inodes_wb(&bdi->wb, &wbc);
 }
 
 /*
@@ -374,10 +370,13 @@ static int bdi_sync_supers(void *unused)
         return 0;
 }
 
-static void arm_supers_timer(void)
+void bdi_arm_supers_timer(void)
 {
         unsigned long next;
 
+        if (!dirty_writeback_interval)
+                return;
+
         next = msecs_to_jiffies(dirty_writeback_interval * 10) + jiffies;
         mod_timer(&sync_supers_timer, round_jiffies_up(next));
 }
@@ -385,7 +384,7 @@ static void arm_supers_timer(void)
 static void sync_supers_timer_fn(unsigned long unused)
 {
         wake_up_process(sync_supers_tsk);
-        arm_supers_timer();
+        bdi_arm_supers_timer();
 }
 
 static int bdi_forker_task(void *ptr)
@@ -428,7 +427,10 @@ static int bdi_forker_task(void *ptr)
 
                         spin_unlock_bh(&bdi_lock);
                         wait = msecs_to_jiffies(dirty_writeback_interval * 10);
-                        schedule_timeout(wait);
+                        if (wait)
+                                schedule_timeout(wait);
+                        else
+                                schedule();
                         try_to_freeze();
                         continue;
                 }
@@ -670,12 +672,6 @@ int bdi_init(struct backing_dev_info *bdi)
 
         bdi_wb_init(&bdi->wb, bdi);
 
-        /*
-         * Just one thread support for now, hard code mask and count
-         */
-        bdi->wb_mask = 1;
-        bdi->wb_cnt = 1;
-
         for (i = 0; i < NR_BDI_STAT_ITEMS; i++) {
                 err = percpu_counter_init(&bdi->bdi_stat[i], 0);
                 if (err)