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Commit 0d01c5df authored by Douglas Gilbert's avatar Douglas Gilbert Committed by Christoph Hellwig
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scsi_debug: add Capacity Changed Unit Attention 



Via sysfs the virtual_gb scsi_debug parameter can be changed while
LUs are in use. If that changes, the 'Capacity data has changed'
Unit Attention is queued on all LUs.

Signed-off-by: default avatarDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 817fd66b

drivers/scsi/scsi_debug.c

+24 −4
Original line number Diff line number Diff line
@@ -179,7 +179,8 @@ static const char *scsi_debug_version_date = "20141022"; 
#define SDEBUG_UA_POR 0		/* Power on, reset, or bus device reset */

#define SDEBUG_UA_BUS_RESET 1

#define SDEBUG_UA_MODE_CHANGED 2

#define SDEBUG_NUM_UAS 3

#define SDEBUG_UA_CAPACITY_CHANGED 3

#define SDEBUG_NUM_UAS 4



/* for check_readiness() */

#define UAS_ONLY 1
@@ -582,6 +583,11 @@ static int check_readiness(struct scsi_cmnd *SCpnt, int uas_only, 
			if (debug)

				cp = "mode parameters changed";

			break;

		case SDEBUG_UA_CAPACITY_CHANGED:

			mk_sense_buffer(SCpnt, UNIT_ATTENTION,

					UA_CHANGED_ASC, CAPACITY_CHANGED_ASCQ);

			if (debug)

				cp = "capacity data changed";

		default:

			pr_warn("%s: unexpected unit attention code=%d\n",

				__func__, k);
@@ -3638,16 +3644,30 @@ static ssize_t virtual_gb_show(struct device_driver *ddp, char *buf) 
{

        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb);

}



static ssize_t virtual_gb_store(struct device_driver *ddp, const char *buf,

				size_t count)

{

	int n;

	bool changed;



	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {

		changed = (scsi_debug_virtual_gb != n);

		scsi_debug_virtual_gb = n;



		sdebug_capacity = get_sdebug_capacity();

		if (changed) {

			struct sdebug_host_info *sdhp;

			struct sdebug_dev_info *dp;



			list_for_each_entry(sdhp, &sdebug_host_list,

					    host_list) {

				list_for_each_entry(dp, &sdhp->dev_info_list,

						    dev_list) {

					set_bit(SDEBUG_UA_CAPACITY_CHANGED,

						dp->uas_bm);

				}

			}

		}

		return count;

	}

	return -EINVAL;