580 typedef struct xfs_agf {  struct
584 	__be32		agf_magicnum;	/* magic number == XFS_AGF_MAGIC */
585 	__be32		agf_versionnum;	/* header version == XFS_AGF_VERSION */
586 	__be32		agf_seqno;	/* sequence # starting from 0 */
587 	__be32		agf_length;	/* size in blocks of a.g. */
591 	__be32		agf_roots[XFS_BTNUM_AGF];	/* root blocks */
592 	__be32		agf_spare0;	/* spare field */
593 	__be32		agf_levels[XFS_BTNUM_AGF];	/* btree levels */
594 	__be32		agf_spare1;	/* spare field */
618 } xfs_agf_t;  argument
620 #define XFS_AGF_CRC_OFF		offsetof(struct xfs_agf, agf_crc)  argument