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[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>
This commit is contained in:
K. Y. Srinivasan 2013-02-21 12:04:53 -08:00 committed by James Bottomley
parent c50bd44817
commit 6781209e76
1 changed files with 31 additions and 0 deletions
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31
drivers/scsi/storvsc_drv.c
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@ -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;