[SCSI] storvsc: Handle dynamic resizing of the device

Handle LUN size changes by re-scanning the device.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 95c759f..5dd6c49 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -201,6 +201,7 @@ enum storvsc_request_type {
 #define SRB_STATUS_AUTOSENSE_VALID     0x80
 #define SRB_STATUS_INVALID_LUN 0x20
 #define SRB_STATUS_SUCCESS     0x01
+#define SRB_STATUS_ABORTED     0x02
 #define SRB_STATUS_ERROR       0x04
 
 /*
@@ -295,6 +296,25 @@ struct storvsc_scan_work {
        uint lun;
 };
 
+static void storvsc_device_scan(struct work_struct *work)
+{
+       struct storvsc_scan_work *wrk;
+       uint lun;
+       struct scsi_device *sdev;
+
+       wrk = container_of(work, struct storvsc_scan_work, work);
+       lun = wrk->lun;
+
+       sdev = scsi_device_lookup(wrk->host, 0, 0, lun);
+       if (!sdev)
+               goto done;
+       scsi_rescan_device(&sdev->sdev_gendev);
+       scsi_device_put(sdev);
+
+done:
+       kfree(wrk);
+}
+
 static void storvsc_bus_scan(struct work_struct *work)
 {
        struct storvsc_scan_work *wrk;
@@ -791,7 +811,18 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
                do_work = true;
                process_err_fn = storvsc_remove_lun;
                break;
+       case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
+               if ((asc == 0x2a) && (ascq == 0x9)) {
+                       do_work = true;
+                       process_err_fn = storvsc_device_scan;
+                       /*
+                        * Retry the I/O that trigerred this.
+                        */
+                       set_host_byte(scmnd, DID_REQUEUE);
+               }
+               break;
        }
+
        if (!do_work)
                return;