[SCSI] zfcp: initialize scsi_host_template.max_sectors with appropriate value

Define ZFCP_MAX_SECTORS and initialize scsi_host_template.max_sectors
with appropriate value.
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/s390/scsi/zfcp_def.h

@@ -107,6 +107,10 @@ zfcp_address_to_sg(void *address, struct scatterlist *list)
 	(ZFCP_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
 
+#define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
+        /* max. number of (data buffer) SBALEs in largest SBAL chain
+           multiplied with number of sectors per 4k block */
+
 /* FIXME(tune): free space should be one max. SBAL chain plus what? */
 #define ZFCP_QDIO_PCI_INTERVAL		(QDIO_MAX_BUFFERS_PER_Q \
                                          - (ZFCP_MAX_SBALS_PER_REQ + 4))

drivers/s390/scsi/zfcp_scsi.c

@@ -58,6 +58,7 @@ struct zfcp_data zfcp_data = {
 		.cmd_per_lun		= 1,
 		.use_clustering		= 1,
 		.sdev_attrs		= zfcp_sysfs_sdev_attrs,
+		.max_sectors		= ZFCP_MAX_SECTORS,
 	},
 	.driver_version = ZFCP_VERSION,
 };