8  * Calculate the intermediate checksum for a buffer that has the CRC field
9  * inside it.  The offset of the 32bit crc fields is passed as the
11  * hence we have to split the CRC calculation across the cksum_offset.
17 	uint32_t crc;  in xfs_start_cksum_safe()  local
19 	/* Calculate CRC up to the checksum. */  in xfs_start_cksum_safe()
20 	crc = crc32c(XFS_CRC_SEED, buffer, cksum_offset);  in xfs_start_cksum_safe()
23 	crc = crc32c(crc, &zero, sizeof(__u32));  in xfs_start_cksum_safe()
25 	/* Calculate the rest of the CRC. */  in xfs_start_cksum_safe()
26 	return crc32c(crc, &buffer[cksum_offset + sizeof(__be32)],  in xfs_start_cksum_safe()
31  * Fast CRC method where the buffer is modified. Callers must have exclusive
37 	/* zero the CRC field */  in xfs_start_cksum_update()
40 	/* single pass CRC calculation for the entire buffer */  in xfs_start_cksum_update()
52 xfs_end_cksum(uint32_t crc)  in xfs_end_cksum()  argument
54 	return ~cpu_to_le32(crc);  in xfs_end_cksum()
66 	uint32_t crc = xfs_start_cksum_update(buffer, length, cksum_offset);  in xfs_update_cksum()  local
68 	*(__le32 *)(buffer + cksum_offset) = xfs_end_cksum(crc);  in xfs_update_cksum()
77 	uint32_t crc = xfs_start_cksum_safe(buffer, length, cksum_offset);  in xfs_verify_cksum()  local
79 	return *(__le32 *)(buffer + cksum_offset) == xfs_end_cksum(crc);  in xfs_verify_cksum()