f2fs: reserve nid resource for quota sysfile

During mkfs, quota sysfiles have already occupied nid resource,
it needs to adjust remaining available nid count in kernel side.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 6abf26c..ef68433 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1101,6 +1101,8 @@ struct f2fs_sb_info {
 	block_t reserved_blocks;		/* configurable reserved blocks */
 	block_t current_reserved_blocks;	/* current reserved blocks */
 
+	unsigned int nquota_files;		/* # of quota sysfile */
+
 	u32 s_next_generation;			/* for NFS support */
 
 	/* # of pages, see count_type */