xfs: always check magic values in on-disk byte order

Most verifiers that check on-disk magic values convert the CPU
endian magic value constant to disk endian to facilitate compile
time optimization of the byte swap and reduce the need for runtime
byte swaps in buffer verifiers. Several buffer verifiers do not
follow this pattern. Update those verifiers for consistency.

Also fix up a random typo in the inode readahead verifier name.

Signed-off-by: Brian Foster <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
Signed-off-by: Darrick J. Wong <[e-mail]>

fs/xfs/libxfs/xfs_alloc.c

···
 
 	if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid))
 		return __this_address;
-	if (be32_to_cpu(agfl->agfl_magicnum) != XFS_AGFL_MAGIC)
+	if (agfl->agfl_magicnum != cpu_to_be32(XFS_AGFL_MAGIC))
 		return __this_address;
 	/*
 	 * during growfs operations, the perag is not fully initialised,

fs/xfs/libxfs/xfs_attr_leaf.c

···
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {
 		struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
 
-		if (ichdr.magic != XFS_ATTR3_LEAF_MAGIC)
+		if (hdr3->info.hdr.magic != cpu_to_be16(XFS_ATTR3_LEAF_MAGIC))
 			return __this_address;
 
 		if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
···
 		if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn)))
 			return __this_address;
 	} else {
-		if (ichdr.magic != XFS_ATTR_LEAF_MAGIC)
+		if (leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))
 			return __this_address;
 	}
 	/*

fs/xfs/libxfs/xfs_da_btree.c

···
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {
 		struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
 
-		if (ichdr.magic != XFS_DA3_NODE_MAGIC)
+		if (hdr3->info.hdr.magic != cpu_to_be16(XFS_DA3_NODE_MAGIC))
 			return __this_address;
 
 		if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
···
 		if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn)))
 			return __this_address;
 	} else {
-		if (ichdr.magic != XFS_DA_NODE_MAGIC)
+		if (hdr->hdr.info.magic != cpu_to_be16(XFS_DA_NODE_MAGIC))
 			return __this_address;
 	}
 	if (ichdr.level == 0)

fs/xfs/libxfs/xfs_inode_buf.c

···
 };
 
 const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
-	.name = "xxfs_inode_ra",
+	.name = "xfs_inode_ra",
 	.verify_read = xfs_inode_buf_readahead_verify,
 	.verify_write = xfs_inode_buf_write_verify,
 };

fs/xfs/libxfs/xfs_sb.c

···
 	struct xfs_buf		*bp,
 	struct xfs_sb		*sbp)
 {
+	struct xfs_dsb		*dsb = XFS_BUF_TO_SBP(bp);
 	uint32_t		agcount = 0;
 	uint32_t		rem;
 
-	if (sbp->sb_magicnum != XFS_SB_MAGIC) {
+	if (dsb->sb_magicnum != cpu_to_be32(XFS_SB_MAGIC)) {
 		xfs_warn(mp, "bad magic number");
 		return -EWRONGFS;
 	}