Commit 6781209e authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by James Bottomley
Browse files

[SCSI] storvsc: Handle dynamic resizing of the device 



Handle LUN size changes by re-scanning the device.

Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent c50bd448

drivers/scsi/storvsc_drv.c

+31 −0
Original line number Diff line number Diff line
@@ -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;