[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>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 95c759fe071a..5dd6c49bfa7e 100644
--- 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;