[SCSI] add residual argument to scsi_execute and scsi_execute_req

scsi_execute() and scsi_execute_req() discard the residual length
information. Some callers need it. This adds residual argument
(optional) to scsi_execute and scsi_execute_req.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

9 files changed, 33 insertions, 24 deletions

diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 88ecf94ad979..af9725409f43 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -190,7 +190,7 @@ ch_do_scsi(scsi_changer *ch, unsigned char *cmd,
 
         result = scsi_execute_req(ch->device, cmd, direction, buffer,
                                   buflength, &sshdr, timeout * HZ,
-                                  MAX_RETRIES);
+                                  MAX_RETRIES, NULL);
 
         dprintk("result: 0x%x\n",result);
         if (driver_byte(result) & DRIVER_SENSE) {
diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c
index 2ee49f82ca01..2ae4f8fc5831 100644
--- a/drivers/scsi/scsi_ioctl.c
+++ b/drivers/scsi/scsi_ioctl.c
@@ -94,7 +94,7 @@ static int ioctl_internal_command(struct scsi_device *sdev, char *cmd,
         SCSI_LOG_IOCTL(1, printk("Trying ioctl with scsi command %d\n", *cmd));
 
         result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0,
-                                  &sshdr, timeout, retries);
+                                  &sshdr, timeout, retries, NULL);
 
         SCSI_LOG_IOCTL(2, printk("Ioctl returned  0x%x\n", result));
 
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index ecfbbd30dce5..f2f51e0333eb 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -183,13 +183,15 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
  * @timeout:    request timeout in seconds
  * @retries:    number of times to retry request
  * @flags:      or into request flags;
+ * @resid:      optional residual length
  *
  * returns the req->errors value which is the scsi_cmnd result
  * field.
  */
 int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
                  int data_direction, void *buffer, unsigned bufflen,
-                 unsigned char *sense, int timeout, int retries, int flags)
+                 unsigned char *sense, int timeout, int retries, int flags,
+                 int *resid)
 {
         struct request *req;
         int write = (data_direction == DMA_TO_DEVICE);
@@ -224,6 +226,8 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
         if (unlikely(req->data_len > 0 && req->data_len <= bufflen))
                 memset(buffer + (bufflen - req->data_len), 0, req->data_len);
 
+        if (resid)
+                *resid = req->data_len;
         ret = req->errors;
  out:
         blk_put_request(req);
@@ -235,7 +239,8 @@ EXPORT_SYMBOL(scsi_execute);
 
 int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
                      int data_direction, void *buffer, unsigned bufflen,
-                     struct scsi_sense_hdr *sshdr, int timeout, int retries)
+                     struct scsi_sense_hdr *sshdr, int timeout, int retries,
+                     int *resid)
 {
         char *sense = NULL;
         int result;
@@ -246,7 +251,7 @@ int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
                         return DRIVER_ERROR << 24;
         }
         result = scsi_execute(sdev, cmd, data_direction, buffer, bufflen,
-                              sense, timeout, retries, 0);
+                              sense, timeout, retries, 0, resid);
         if (sshdr)
                 scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, sshdr);
 
@@ -2016,7 +2021,7 @@ scsi_mode_select(struct scsi_device *sdev, int pf, int sp, int modepage,
         }
 
         ret = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, real_buffer, len,
-                               sshdr, timeout, retries);
+                               sshdr, timeout, retries, NULL);
         kfree(real_buffer);
         return ret;
 }
@@ -2081,7 +2086,7 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
         memset(buffer, 0, len);
 
         result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len,
-                                  sshdr, timeout, retries);
+                                  sshdr, timeout, retries, NULL);
 
         /* This code looks awful: what it's doing is making sure an
          * ILLEGAL REQUEST sense return identifies the actual command
@@ -2163,7 +2168,7 @@ scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries,
         /* try to eat the UNIT_ATTENTION if there are enough retries */
         do {
                 result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0, sshdr,
-                                          timeout, retries);
+                                          timeout, retries, NULL);
                 if (sdev->removable && scsi_sense_valid(sshdr) &&
                     sshdr->sense_key == UNIT_ATTENTION)
                         sdev->changed = 1;
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index b14dc02c3ded..6963d529e0f0 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -216,7 +216,7 @@ static void scsi_unlock_floptical(struct scsi_device *sdev,
         scsi_cmd[4] = 0x2a;     /* size */
         scsi_cmd[5] = 0;
         scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
-                         SCSI_TIMEOUT, 3);
+                         SCSI_TIMEOUT, 3, NULL);
 }
 
 /**
@@ -581,7 +581,8 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
 
                 result = scsi_execute_req(sdev,  scsi_cmd, DMA_FROM_DEVICE,
                                           inq_result, try_inquiry_len, &sshdr,
-                                          HZ / 2 + HZ * scsi_inq_timeout, 3);
+                                          HZ / 2 + HZ * scsi_inq_timeout, 3,
+                                          NULL);
 
                 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
                                 "with code 0x%x\n",
@@ -1390,7 +1391,7 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
 
                 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
                                           lun_data, length, &sshdr,
-                                          SCSI_TIMEOUT + 4 * HZ, 3);
+                                          SCSI_TIMEOUT + 4 * HZ, 3, NULL);
 
                 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
                                 " %s (try %d) result 0x%x\n", result
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 7c2d28924d2a..96361aa70906 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -111,7 +111,8 @@ static int spi_execute(struct scsi_device *sdev, const void *cmd,
                                       sense, DV_TIMEOUT, /* retries */ 1,
                                       REQ_FAILFAST_DEV |
                                       REQ_FAILFAST_TRANSPORT |
-                                      REQ_FAILFAST_DRIVER);
+                                      REQ_FAILFAST_DRIVER,
+                                      NULL);
                 if (result & DRIVER_SENSE) {
                         struct scsi_sense_hdr sshdr_tmp;
                         if (!sshdr)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 5081b3981d3c..62b28d58e65e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -884,7 +884,7 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
                  * flush everything.
                  */
                 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
-                                       SD_TIMEOUT, SD_MAX_RETRIES);
+                                       SD_TIMEOUT, SD_MAX_RETRIES, NULL);
                 if (res == 0)
                         break;
         }
@@ -1134,7 +1134,7 @@ sd_spinup_disk(struct scsi_disk *sdkp)
                         the_result = scsi_execute_req(sdkp->device, cmd,
                                                       DMA_NONE, NULL, 0,
                                                       &sshdr, SD_TIMEOUT,
-                                                      SD_MAX_RETRIES);
+                                                      SD_MAX_RETRIES, NULL);
 
                         /*
                          * If the drive has indicated to us that it
@@ -1192,7 +1192,8 @@ sd_spinup_disk(struct scsi_disk *sdkp)
                                         cmd[4] |= 1 << 4;
                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
                                                  NULL, 0, &sshdr,
-                                                 SD_TIMEOUT, SD_MAX_RETRIES);
+                                                 SD_TIMEOUT, SD_MAX_RETRIES,
+                                                 NULL);
                                 spintime_expire = jiffies + 100 * HZ;
                                 spintime = 1;
                         }
@@ -1306,7 +1307,7 @@ repeat:
                 
                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
                                               buffer, longrc ? 13 : 8, &sshdr,
-                                              SD_TIMEOUT, SD_MAX_RETRIES);
+                                              SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 
                 if (media_not_present(sdkp, &sshdr))
                         return;
@@ -1986,7 +1987,7 @@ static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
                 return -ENODEV;
 
         res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
-                               SD_TIMEOUT, SD_MAX_RETRIES);
+                               SD_TIMEOUT, SD_MAX_RETRIES, NULL);
         if (res) {
                 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
                 sd_print_result(sdkp, res);
diff --git a/drivers/scsi/ses.c b/drivers/scsi/ses.c
index 1bcf3c33d7ff..7f0df29f3a64 100644
--- a/drivers/scsi/ses.c
+++ b/drivers/scsi/ses.c
@@ -77,7 +77,7 @@ static int ses_recv_diag(struct scsi_device *sdev, int page_code,
         };
 
         return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
-                                NULL, SES_TIMEOUT, SES_RETRIES);
+                                NULL, SES_TIMEOUT, SES_RETRIES, NULL);
 }
 
 static int ses_send_diag(struct scsi_device *sdev, int page_code,
@@ -95,7 +95,7 @@ static int ses_send_diag(struct scsi_device *sdev, int page_code,
         };
 
         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
-                                  NULL, SES_TIMEOUT, SES_RETRIES);
+                                  NULL, SES_TIMEOUT, SES_RETRIES, NULL);
         if (result)
                 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
                             result);
@@ -369,7 +369,8 @@ static void ses_match_to_enclosure(struct enclosure_device *edev,
                 return;
 
         if (scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf,
-                             VPD_INQUIRY_SIZE, NULL, SES_TIMEOUT, SES_RETRIES))
+                             VPD_INQUIRY_SIZE, NULL, SES_TIMEOUT, SES_RETRIES,
+                             NULL))
                 goto free;
 
         vpd_len = (buf[2] << 8) + buf[3];
@@ -380,7 +381,7 @@ static void ses_match_to_enclosure(struct enclosure_device *edev,
         cmd[3] = vpd_len >> 8;
         cmd[4] = vpd_len & 0xff;
         if (scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf,
-                             vpd_len, NULL, SES_TIMEOUT, SES_RETRIES))
+                             vpd_len, NULL, SES_TIMEOUT, SES_RETRIES, NULL))
                 goto free;
 
         desc = buf + 4;
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 45b66b98a516..e7fa3caead79 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -177,7 +177,7 @@ int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr)
         do {
                 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL,
                                               0, sshdr, SR_TIMEOUT,
-                                              retries--);
+                                              retries--, NULL);
                 if (scsi_sense_valid(sshdr) &&
                     sshdr->sense_key == UNIT_ATTENTION)
                         sdev->changed = 1;
@@ -681,7 +681,7 @@ static void get_sectorsize(struct scsi_cd *cd)
                 /* Do the command and wait.. */
                 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
                                               buffer, sizeof(buffer), NULL,
-                                              SR_TIMEOUT, MAX_RETRIES);
+                                              SR_TIMEOUT, MAX_RETRIES, NULL);
 
                 retries--;
 
diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c
index ae87d08df588..d92ff512d213 100644
--- a/drivers/scsi/sr_ioctl.c
+++ b/drivers/scsi/sr_ioctl.c
@@ -207,7 +207,7 @@ int sr_do_ioctl(Scsi_CD *cd, struct packet_command *cgc)
         memset(sense, 0, sizeof(*sense));
         result = scsi_execute(SDev, cgc->cmd, cgc->data_direction,
                               cgc->buffer, cgc->buflen, (char *)sense,
-                              cgc->timeout, IOCTL_RETRIES, 0);
+                              cgc->timeout, IOCTL_RETRIES, 0, NULL);
 
         scsi_normalize_sense((char *)sense, sizeof(*sense), &sshdr);