[PATCH 4/4] vfs: cleanup writeback_inodes_sb{_nr}_if_idle() and unused export

[Miao Xie <miaoxie1984@gmail.com>]

writeback_inodes_sb{_nr}_if_idle() is not invoked by other functions, so
cleanup them.

No module calls writeback_inodes_sb_nr(), so its export is unused, cleanup it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
---
 fs/fs-writeback.c         |   44 --------------------------------------------
 include/linux/writeback.h |    3 ---
 2 files changed, 0 insertions(+), 47 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index b0c35c3..7bcb822 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1230,7 +1230,6 @@ void writeback_inodes_sb_nr(struct super_block *sb,
 	bdi_queue_work(sb->s_bdi, &work);
 	wait_for_completion(&done);
 }
-EXPORT_SYMBOL(writeback_inodes_sb_nr);
 
 /**
  * writeback_inodes_sb	-	writeback dirty inodes from given super_block
@@ -1248,49 +1247,6 @@ void writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
 EXPORT_SYMBOL(writeback_inodes_sb);
 
 /**
- * writeback_inodes_sb_if_idle	-	start writeback if none underway
- * @sb: the superblock
- * @reason: reason why some writeback work was initiated
- *
- * Invoke writeback_inodes_sb if no writeback is currently underway.
- * Returns 1 if writeback was started, 0 if not.
- */
-int writeback_inodes_sb_if_idle(struct super_block *sb, enum wb_reason reason)
-{
-	if (!writeback_in_progress(sb->s_bdi)) {
-		down_read(&sb->s_umount);
-		writeback_inodes_sb(sb, reason);
-		up_read(&sb->s_umount);
-		return 1;
-	} else
-		return 0;
-}
-EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
-
-/**
- * writeback_inodes_sb_nr_if_idle	-	start writeback if none underway
- * @sb: the superblock
- * @nr: the number of pages to write
- * @reason: reason why some writeback work was initiated
- *
- * Invoke writeback_inodes_sb if no writeback is currently underway.
- * Returns 1 if writeback was started, 0 if not.
- */
-int writeback_inodes_sb_nr_if_idle(struct super_block *sb,
-				   unsigned long nr,
-				   enum wb_reason reason)
-{
-	if (!writeback_in_progress(sb->s_bdi)) {
-		down_read(&sb->s_umount);
-		writeback_inodes_sb_nr(sb, nr, reason);
-		up_read(&sb->s_umount);
-		return 1;
-	} else
-		return 0;
-}
-EXPORT_SYMBOL(writeback_inodes_sb_nr_if_idle);
-
-/**
  * try_to_writeback_inodes_sb_nr - try to start writeback if none underway
  * @sb: the superblock
  * @nr: the number of pages to write
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index d8e2a99..0552d1a 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -86,9 +86,6 @@ int inode_wait(void *);
 void writeback_inodes_sb(struct super_block *, enum wb_reason reason);
 void writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
 							enum wb_reason reason);
-int writeback_inodes_sb_if_idle(struct super_block *, enum wb_reason reason);
-int writeback_inodes_sb_nr_if_idle(struct super_block *, unsigned long nr,
-							enum wb_reason reason);
 int try_to_writeback_inodes_sb(struct super_block *, enum wb_reason reason);
 int try_to_writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
 				  enum wb_reason reason);
-- 
1.7.6.5