Commit d3d32891 authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Martin K. Petersen
Browse files

scsi_dh: add 'rescan' callback 



If a device needs to be rescanned the device_handler might need
to be rechecked, too.
So add a 'rescan' callback to the device handler and call it
upon scsi_rescan_device(). The rescan callback will be invoked
from the Unit Attention handling of ASC/ASCQ 3F 03
(INQUIRY DATA HAS CHANGED).

Reviewed-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 9d2c3039

drivers/scsi/device_handler/scsi_dh_alua.c

+8 −0
Original line number Diff line number Diff line
@@ -1026,6 +1026,13 @@ static int alua_prep_fn(struct scsi_device *sdev, struct request *req) 


}



static void alua_rescan(struct scsi_device *sdev)

{

	struct alua_dh_data *h = sdev->handler_data;



	alua_initialize(sdev, h);

}



/*

 * alua_bus_attach - Attach device handler

 * @sdev: device to be attached to
@@ -1086,6 +1093,7 @@ static struct scsi_device_handler alua_dh = { 
	.prep_fn = alua_prep_fn,

	.check_sense = alua_check_sense,

	.activate = alua_activate,

	.rescan = alua_rescan,

	.set_params = alua_set_params,

};

drivers/scsi/scsi_lib.c

+1 −0
Original line number Diff line number Diff line
@@ -2699,6 +2699,7 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt) 
		envp[idx++] = "SDEV_MEDIA_CHANGE=1";

		break;

	case SDEV_EVT_INQUIRY_CHANGE_REPORTED:

		scsi_rescan_device(&sdev->sdev_gendev);

		envp[idx++] = "SDEV_UA=INQUIRY_DATA_HAS_CHANGED";

		break;

	case SDEV_EVT_CAPACITY_CHANGE_REPORTED:

drivers/scsi/scsi_scan.c

+7 −1
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ 
#include <scsi/scsi_devinfo.h>

#include <scsi/scsi_host.h>

#include <scsi/scsi_transport.h>

#include <scsi/scsi_dh.h>

#include <scsi/scsi_eh.h>



#include "scsi_priv.h"
@@ -1524,9 +1525,14 @@ EXPORT_SYMBOL(scsi_add_device); 


void scsi_rescan_device(struct device *dev)

{

	struct scsi_device *sdev = to_scsi_device(dev);



	device_lock(dev);



	scsi_attach_vpd(to_scsi_device(dev));

	scsi_attach_vpd(sdev);



	if (sdev->handler && sdev->handler->rescan)

		sdev->handler->rescan(sdev);



	if (dev->driver && try_module_get(dev->driver->owner)) {

		struct scsi_driver *drv = to_scsi_driver(dev->driver);

include/scsi/scsi_dh.h

+1 −0
Original line number Diff line number Diff line
@@ -71,6 +71,7 @@ struct scsi_device_handler { 
	int (*activate)(struct scsi_device *, activate_complete, void *);

	int (*prep_fn)(struct scsi_device *, struct request *);

	int (*set_params)(struct scsi_device *, const char *);

	void (*rescan)(struct scsi_device *);

};



#ifdef CONFIG_SCSI_DH

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