510 typedef struct xfs_agf {  struct
514 	__be32		agf_magicnum;	/* magic number == XFS_AGF_MAGIC */
515 	__be32		agf_versionnum;	/* header version == XFS_AGF_VERSION */
516 	__be32		agf_seqno;	/* sequence # starting from 0 */
517 	__be32		agf_length;	/* size in blocks of a.g. */
521 	__be32		agf_bno_root;	/* bnobt root block */
522 	__be32		agf_cnt_root;	/* cntbt root block */
523 	__be32		agf_rmap_root;	/* rmapbt root block */
525 	__be32		agf_bno_level;	/* bnobt btree levels */
526 	__be32		agf_cnt_level;	/* cntbt btree levels */
527 	__be32		agf_rmap_level;	/* rmapbt btree levels */
529 	__be32		agf_flfirst;	/* first freelist block's index */
530 	__be32		agf_fllast;	/* last freelist block's index */
531 	__be32		agf_flcount;	/* count of blocks in freelist */
532 	__be32		agf_freeblks;	/* total free blocks */
557 } xfs_agf_t;  argument
559 #define XFS_AGF_CRC_OFF		offsetof(struct xfs_agf, agf_crc)  argument