extern int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path);
extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
int format_id, int type);
extern int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path);
extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
int format_id, int type);