writeback: pay attention to wbc->nr_to_write in write_cache_pages

[pandora-kernel.git] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0b19943..b3dbb80 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -683,10 +683,6 @@ void throttle_vm_writeout(gfp_t gfp_mask)
         }
 }
 
-static void laptop_timer_fn(unsigned long unused);
-
-static DEFINE_TIMER(laptop_mode_wb_timer, laptop_timer_fn, 0, 0);
-
 /*
  * sysctl handler for /proc/sys/vm/dirty_writeback_centisecs
  */
@@ -694,24 +690,24 @@ int dirty_writeback_centisecs_handler(ctl_table *table, int write,
        void __user *buffer, size_t *length, loff_t *ppos)
 {
        proc_dointvec(table, write, buffer, length, ppos);
+       bdi_arm_supers_timer();
        return 0;
 }
 
-static void do_laptop_sync(struct work_struct *work)
+#ifdef CONFIG_BLOCK
+void laptop_mode_timer_fn(unsigned long data)
 {
-       wakeup_flusher_threads(0);
-       kfree(work);
-}
+       struct request_queue *q = (struct request_queue *)data;
+       int nr_pages = global_page_state(NR_FILE_DIRTY) +
+               global_page_state(NR_UNSTABLE_NFS);
 
-static void laptop_timer_fn(unsigned long unused)
-{
-       struct work_struct *work;
+       /*
+        * We want to write everything out, not just down to the dirty
+        * threshold
+        */
 
-       work = kmalloc(sizeof(*work), GFP_ATOMIC);
-       if (work) {
-               INIT_WORK(work, do_laptop_sync);
-               schedule_work(work);
-       }
+       if (bdi_has_dirty_io(&q->backing_dev_info))
+               bdi_start_writeback(&q->backing_dev_info, NULL, nr_pages);
 }
 
 /*
@@ -719,9 +715,9 @@ static void laptop_timer_fn(unsigned long unused)
  * of all dirty data a few seconds from now.  If the flush is already scheduled
  * then push it back - the user is still using the disk.
  */
-void laptop_io_completion(void)
+void laptop_io_completion(struct backing_dev_info *info)
 {
-       mod_timer(&laptop_mode_wb_timer, jiffies + laptop_mode);
+       mod_timer(&info->laptop_mode_wb_timer, jiffies + laptop_mode);
 }
 
 /*
@@ -731,8 +727,16 @@ void laptop_io_completion(void)
  */
 void laptop_sync_completion(void)
 {
-       del_timer(&laptop_mode_wb_timer);
+       struct backing_dev_info *bdi;
+
+       rcu_read_lock();
+
+       list_for_each_entry_rcu(bdi, &bdi_list, bdi_list)
+               del_timer(&bdi->laptop_mode_wb_timer);
+
+       rcu_read_unlock();
 }
+#endif
 
 /*
  * If ratelimit_pages is too high then we can get into dirty-data overload
@@ -831,7 +835,6 @@ int write_cache_pages(struct address_space *mapping,
        pgoff_t done_index;
        int cycled;
        int range_whole = 0;
-       long nr_to_write = wbc->nr_to_write;
 
        pagevec_init(&pvec, 0);
        if (wbc->range_cyclic) {
@@ -931,11 +934,10 @@ continue_unlock:
                                        done = 1;
                                        break;
                                }
-                       }
+                       }
 
-                       if (nr_to_write > 0) {
-                               nr_to_write--;
-                               if (nr_to_write == 0 &&
+                       if (wbc->nr_to_write > 0) {
+                               if (--wbc->nr_to_write == 0 &&
                                    wbc->sync_mode == WB_SYNC_NONE) {
                                        /*
                                         * We stop writing back only if we are
@@ -966,11 +968,8 @@ continue_unlock:
                end = writeback_index - 1;
                goto retry;
        }
-       if (!wbc->no_nrwrite_index_update) {
-               if (wbc->range_cyclic || (range_whole && nr_to_write > 0))
-                       mapping->writeback_index = done_index;
-               wbc->nr_to_write = nr_to_write;
-       }
+       if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
+               mapping->writeback_index = done_index;
 
        return ret;
 }