correct compile warnings without Large Block Device support

Based on a patch from Andrew Morton.

Also checks to see if the sd device is bigger than the kernel can
support and prints out a warning in that case

drivers/scsi/sd.c

@@ -301,10 +301,10 @@ static int sd_init_command(struct scsi_cmnd * SCpnt)
 	
 	if (block > 0xffffffff) {
 		SCpnt->cmnd[0] += READ_16 - READ_6;
-		SCpnt->cmnd[2] = (unsigned char) (block >> 56) & 0xff;
-		SCpnt->cmnd[3] = (unsigned char) (block >> 48) & 0xff;
-		SCpnt->cmnd[4] = (unsigned char) (block >> 40) & 0xff;
-		SCpnt->cmnd[5] = (unsigned char) (block >> 32) & 0xff;
+		SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
+		SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
+		SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
+		SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
 		SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
 		SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
 		SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
@@ -931,7 +931,7 @@ sd_read_capacity(struct scsi_disk *sdkp, char *diskname,
 		if (longrc) {
 			memset((void *) cmd, 0, 16);
 			cmd[0] = SERVICE_ACTION_IN;
-			cmd[1] = 0x10; /* READ CAPACITY (16) */
+			cmd[1] = SAI_READ_CAPACITY_16;
 			cmd[13] = 12;
 			memset((void *) buffer, 0, 12);
 		} else {
@@ -1003,20 +1003,24 @@ sd_read_capacity(struct scsi_disk *sdkp, char *diskname,
 			(buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
 		if (buffer[0] == 0xff && buffer[1] == 0xff &&
 		    buffer[2] == 0xff && buffer[3] == 0xff) {
+			if(sizeof(sdkp->capacity) > 4) {
 				printk(KERN_NOTICE "%s : very big device. try to use"
 				       " READ CAPACITY(16).\n", diskname);
 				longrc = 1;
 				goto repeat;
+			} else {
+				printk(KERN_ERR "%s: too big for kernel.  Assuming maximum 2Tb\n", diskname);
+			}
 		}
 		sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
 			(buffer[1] << 16) |
 			(buffer[2] << 8) |
 			buffer[3]);			
 	} else {
-		sdkp->capacity = 1 + (((sector_t)buffer[0] << 56) |
-			((sector_t)buffer[1] << 48) |
-			((sector_t)buffer[2] << 40) |
-			((sector_t)buffer[3] << 32) |
+		sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
+			((u64)buffer[1] << 48) |
+			((u64)buffer[2] << 40) |
+			((u64)buffer[3] << 32) |
 			((sector_t)buffer[4] << 24) |
 			((sector_t)buffer[5] << 16) |
 			((sector_t)buffer[6] << 8)  |

include/scsi/scsi.h

@@ -99,6 +99,8 @@ extern const unsigned char scsi_command_size[8];
 #define READ_16               0x88
 #define WRITE_16              0x8a
 #define SERVICE_ACTION_IN     0x9e
+/* values for service action in */
+#define	SAI_READ_CAPACITY_16  0x10
 
 
 /*