fs: kill sync_inode

Now that all users of sync_inode() have been deleted, remove
sync_inode().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 4c33705..eb57dad 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -2730,23 +2730,6 @@ int write_inode_now(struct inode *inode, int sync)
 EXPORT_SYMBOL(write_inode_now);
 
 /**
- * sync_inode - write an inode and its pages to disk.
- * @inode: the inode to sync
- * @wbc: controls the writeback mode
- *
- * sync_inode() will write an inode and its pages to disk.  It will also
- * correctly update the inode on its superblock's dirty inode lists and will
- * update inode->i_state.
- *
- * The caller must have a ref on the inode.
- */
-int sync_inode(struct inode *inode, struct writeback_control *wbc)
-{
-	return writeback_single_inode(inode, wbc);
-}
-EXPORT_SYMBOL(sync_inode);
-
-/**
  * sync_inode_metadata - write an inode to disk
  * @inode: the inode to sync
  * @wait: wait for I/O to complete.
@@ -2762,6 +2745,6 @@ int sync_inode_metadata(struct inode *inode, int wait)
 		.nr_to_write = 0, /* metadata-only */
 	};
 
-	return sync_inode(inode, &wbc);
+	return writeback_single_inode(inode, &wbc);
 }
 EXPORT_SYMBOL(sync_inode_metadata);