f2fs: expand counting dirty pages in the inode page cache

Previously f2fs only counts dirty dentry pages, but there is no reason not to
expand the scope.

This patch changes the names on the management of dirty pages and to count
dirty pages in each inode info as well.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 95c0bc2..ff95547 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -276,7 +276,7 @@
 			inode->i_ino == F2FS_META_INO(sbi))
 		goto out_clear;
 
-	f2fs_bug_on(sbi, get_dirty_dents(inode));
+	f2fs_bug_on(sbi, get_dirty_pages(inode));
 	remove_dirty_dir_inode(inode);
 
 	if (inode->i_nlink || is_bad_inode(inode))