[SCSI] scsi_debug: add get_data_transfer_info helper function

This adds get_data_transfer_info helper function that get lha and
sectors for READ_* and WRITE_* commands (and XDWRITEREAD_10 later).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 82c06f0..31f7378 100644 (file)
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -311,12 +311,47 @@ static void sdebug_max_tgts_luns(void);
 static struct device pseudo_primary;
 static struct bus_type pseudo_lld_bus;
 
+static void get_data_transfer_info(unsigned char *cmd,
+                                  unsigned long long *lba, unsigned int *num)
+{
+       int i;
+
+       switch (*cmd) {
+       case WRITE_16:
+       case READ_16:
+               for (*lba = 0, i = 0; i < 8; ++i) {
+                       if (i > 0)
+                               *lba <<= 8;
+                       *lba += cmd[2 + i];
+               }
+               *num = cmd[13] + (cmd[12] << 8) +
+                       (cmd[11] << 16) + (cmd[10] << 24);
+               break;
+       case WRITE_12:
+       case READ_12:
+               *lba = cmd[5] + (cmd[4] << 8) + (cmd[3] << 16) + (cmd[2] << 24);
+               *num = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
+               break;
+       case WRITE_10:
+       case READ_10:
+               *lba = cmd[5] + (cmd[4] << 8) + (cmd[3] << 16) + (cmd[2] << 24);
+               *num = cmd[8] + (cmd[7] << 8);
+               break;
+       case WRITE_6:
+       case READ_6:
+               *lba = cmd[3] + (cmd[2] << 8) + ((cmd[1] & 0x1f) << 16);
+               *num = (0 == cmd[4]) ? 256 : cmd[4];
+               break;
+       default:
+               break;
+       }
+}
 
 static
 int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
 {
        unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
-       int len, k, j;
+       int len, k;
        unsigned int num;
        unsigned long long lba;
        int errsts = 0;
@@ -452,28 +487,7 @@ int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
                        break;
                if (scsi_debug_fake_rw)
                        break;
-               if ((*cmd) == READ_16) {
-                       for (lba = 0, j = 0; j < 8; ++j) {
-                               if (j > 0)
-                                       lba <<= 8;
-                               lba += cmd[2 + j];
-                       }
-                       num = cmd[13] + (cmd[12] << 8) +
-                               (cmd[11] << 16) + (cmd[10] << 24);
-               } else if ((*cmd) == READ_12) {
-                       lba = cmd[5] + (cmd[4] << 8) +
-                               (cmd[3] << 16) + (cmd[2] << 24);
-                       num = cmd[9] + (cmd[8] << 8) +
-                               (cmd[7] << 16) + (cmd[6] << 24);
-               } else if ((*cmd) == READ_10) {
-                       lba = cmd[5] + (cmd[4] << 8) +
-                               (cmd[3] << 16) + (cmd[2] << 24);
-                       num = cmd[8] + (cmd[7] << 8);
-               } else {        /* READ (6) */
-                       lba = cmd[3] + (cmd[2] << 8) +
-                               ((cmd[1] & 0x1f) << 16);
-                       num = (0 == cmd[4]) ? 256 : cmd[4];
-               }
+               get_data_transfer_info(cmd, &lba, &num);
                errsts = resp_read(SCpnt, lba, num, devip);
                if (inj_recovered && (0 == errsts)) {
                        mk_sense_buffer(devip, RECOVERED_ERROR,
@@ -500,28 +514,7 @@ int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
                        break;
                if (scsi_debug_fake_rw)
                        break;
-               if ((*cmd) == WRITE_16) {
-                       for (lba = 0, j = 0; j < 8; ++j) {
-                               if (j > 0)
-                                       lba <<= 8;
-                               lba += cmd[2 + j];
-                       }
-                       num = cmd[13] + (cmd[12] << 8) +
-                               (cmd[11] << 16) + (cmd[10] << 24);
-               } else if ((*cmd) == WRITE_12) {
-                       lba = cmd[5] + (cmd[4] << 8) +
-                               (cmd[3] << 16) + (cmd[2] << 24);
-                       num = cmd[9] + (cmd[8] << 8) +
-                               (cmd[7] << 16) + (cmd[6] << 24);
-               } else if ((*cmd) == WRITE_10) {
-                       lba = cmd[5] + (cmd[4] << 8) +
-                               (cmd[3] << 16) + (cmd[2] << 24);
-                       num = cmd[8] + (cmd[7] << 8);
-               } else {        /* WRITE (6) */
-                       lba = cmd[3] + (cmd[2] << 8) +
-                               ((cmd[1] & 0x1f) << 16);
-                       num = (0 == cmd[4]) ? 256 : cmd[4];
-               }
+               get_data_transfer_info(cmd, &lba, &num);
                errsts = resp_write(SCpnt, lba, num, devip);
                if (inj_recovered && (0 == errsts)) {
                        mk_sense_buffer(devip, RECOVERED_ERROR,