writeback: remove nr_pages_dirtied arg from balance_dirty_pages_ratelimited_nr()

There is no reason to pass the nr_pages_dirtied argument, because
nr_pages_dirtied value from the caller is unused in
balance_dirty_pages_ratelimited_nr().
Signed-off-by: NNamjae Jeon <linkinjeon@gmail.com>
Signed-off-by: NVivek Trivedi <vtrivedi018@gmail.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/btrfs/disk-io.c

@@ -3416,8 +3416,8 @@ void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
 	num_dirty = root->fs_info->dirty_metadata_bytes;
 
 	if (num_dirty > thresh) {
-		balance_dirty_pages_ratelimited_nr(
-				   root->fs_info->btree_inode->i_mapping, 1);
+		balance_dirty_pages_ratelimited(
+				   root->fs_info->btree_inode->i_mapping);
 	}
 	return;
 }
@@ -3437,8 +3437,8 @@ void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
 	num_dirty = root->fs_info->dirty_metadata_bytes;
 
 	if (num_dirty > thresh) {
-		balance_dirty_pages_ratelimited_nr(
-				   root->fs_info->btree_inode->i_mapping, 1);
+		balance_dirty_pages_ratelimited(
+				   root->fs_info->btree_inode->i_mapping);
 	}
 	return;
 }

fs/btrfs/file.c

@@ -1346,8 +1346,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
 
 		cond_resched();
 
-		balance_dirty_pages_ratelimited_nr(inode->i_mapping,
-						   dirty_pages);
+		balance_dirty_pages_ratelimited(inode->i_mapping);
 		if (dirty_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1)
 			btrfs_btree_balance_dirty(root, 1);
 

fs/btrfs/ioctl.c

@@ -1225,7 +1225,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 		}
 
 		defrag_count += ret;
-		balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret);
+		balance_dirty_pages_ratelimited(inode->i_mapping);
 		mutex_unlock(&inode->i_mutex);
 
 		if (newer_than) {

fs/ocfs2/file.c

@@ -2513,18 +2513,15 @@ static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
 		ret = sd.num_spliced;
 
 	if (ret > 0) {
-		unsigned long nr_pages;
 		int err;
 
-		nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
-
 		err = generic_write_sync(out, *ppos, ret);
 		if (err)
 			ret = err;
 		else
 			*ppos += ret;
 
-		balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
+		balance_dirty_pages_ratelimited(mapping);
 	}
 
 	return ret;

fs/splice.c

@@ -1024,17 +1024,14 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
 		ret = sd.num_spliced;
 
 	if (ret > 0) {
-		unsigned long nr_pages;
 		int err;
 
-		nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
-
 		err = generic_write_sync(out, *ppos, ret);
 		if (err)
 			ret = err;
 		else
 			*ppos += ret;
-		balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
+		balance_dirty_pages_ratelimited(mapping);
 	}
 	sb_end_write(inode->i_sb);
 

include/linux/writeback.h

@@ -161,14 +161,7 @@ void __bdi_update_bandwidth(struct backing_dev_info *bdi,
 			    unsigned long start_time);
 
 void page_writeback_init(void);
-void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
-					unsigned long nr_pages_dirtied);
-
-static inline void
-balance_dirty_pages_ratelimited(struct address_space *mapping)
-{
-	balance_dirty_pages_ratelimited_nr(mapping, 1);
-}
+void balance_dirty_pages_ratelimited(struct address_space *mapping);
 
 typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
 				void *data);

mm/page-writeback.c

@@ -1069,7 +1069,7 @@ static void bdi_update_bandwidth(struct backing_dev_info *bdi,
 }
 
 /*
- * After a task dirtied this many pages, balance_dirty_pages_ratelimited_nr()
+ * After a task dirtied this many pages, balance_dirty_pages_ratelimited()
  * will look to see if it needs to start dirty throttling.
  *
  * If dirty_poll_interval is too low, big NUMA machines will call the expensive
@@ -1436,9 +1436,8 @@ static DEFINE_PER_CPU(int, bdp_ratelimits);
 DEFINE_PER_CPU(int, dirty_throttle_leaks) = 0;
 
 /**
- * balance_dirty_pages_ratelimited_nr - balance dirty memory state
+ * balance_dirty_pages_ratelimited - balance dirty memory state
  * @mapping: address_space which was dirtied
- * @nr_pages_dirtied: number of pages which the caller has just dirtied
  *
  * Processes which are dirtying memory should call in here once for each page
  * which was newly dirtied.  The function will periodically check the system's
@@ -1449,8 +1448,7 @@ DEFINE_PER_CPU(int, dirty_throttle_leaks) = 0;
  * limit we decrease the ratelimiting by a lot, to prevent individual processes
  * from overshooting the limit by (ratelimit_pages) each.
  */
-void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
-					unsigned long nr_pages_dirtied)
+void balance_dirty_pages_ratelimited(struct address_space *mapping)
 {
 	struct backing_dev_info *bdi = mapping->backing_dev_info;
 	int ratelimit;
@@ -1484,6 +1482,7 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
 	 */
 	p = &__get_cpu_var(dirty_throttle_leaks);
 	if (*p > 0 && current->nr_dirtied < ratelimit) {
+		unsigned long nr_pages_dirtied;
 		nr_pages_dirtied = min(*p, ratelimit - current->nr_dirtied);
 		*p -= nr_pages_dirtied;
 		current->nr_dirtied += nr_pages_dirtied;
@@ -1493,7 +1492,7 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
 	if (unlikely(current->nr_dirtied >= ratelimit))
 		balance_dirty_pages(mapping, current->nr_dirtied);
 }
-EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr);
+EXPORT_SYMBOL(balance_dirty_pages_ratelimited);
 
 void throttle_vm_writeout(gfp_t gfp_mask)
 {