scsi_debug: Add REPORTED LUNS DATA HAS CHANGED Unit Attention (19c8ead7) · Commits · 戴 / test

drivers/scsi/scsi_debug.c

+55 −1

Original line number	Diff line number	Diff line
		@@ -80,6 +80,8 @@ static const char *scsi_debug_version_date = "20141022";
		#define INVALID_FIELD_IN_PARAM_LIST 0x26
		#define UA_RESET_ASC 0x29
		#define UA_CHANGED_ASC 0x2a
		#define TARGET_CHANGED_ASC 0x3f
		#define LUNS_CHANGED_ASCQ 0x0e
		#define INSUFF_RES_ASC 0x55
		#define INSUFF_RES_ASCQ 0x3
		#define POWER_ON_RESET_ASCQ 0x0
		@@ -180,7 +182,8 @@ static const char *scsi_debug_version_date = "20141022";
		#define SDEBUG_UA_BUS_RESET 1
		#define SDEBUG_UA_MODE_CHANGED 2
		#define SDEBUG_UA_CAPACITY_CHANGED 3
		#define SDEBUG_NUM_UAS 4
		#define SDEBUG_UA_LUNS_CHANGED 4
		#define SDEBUG_NUM_UAS 5

		/* for check_readiness() */
		#define UAS_ONLY 1 /* check for UAs only */
		@@ -782,6 +785,22 @@ static int scsi_debug_ioctl(struct scsi_device dev, int cmd, void __user arg)
		/* return -ENOTTY; // correct return but upsets fdisk */
		}

		static void clear_luns_changed_on_target(struct sdebug_dev_info *devip)
		{
		struct sdebug_host_info *sdhp;
		struct sdebug_dev_info *dp;

		spin_lock(&sdebug_host_list_lock);
		list_for_each_entry(sdhp, &sdebug_host_list, host_list) {
		list_for_each_entry(dp, &sdhp->dev_info_list, dev_list) {
		if ((devip->sdbg_host == dp->sdbg_host) &&
		(devip->target == dp->target))
		clear_bit(SDEBUG_UA_LUNS_CHANGED, dp->uas_bm);
		}
		}
		spin_unlock(&sdebug_host_list_lock);
		}

		static int check_readiness(struct scsi_cmnd *SCpnt, int uas_only,
		struct sdebug_dev_info * devip)
		{
		@@ -817,6 +836,23 @@ static int check_readiness(struct scsi_cmnd *SCpnt, int uas_only,
		if (debug)
		cp = "capacity data changed";
		break;
		case SDEBUG_UA_LUNS_CHANGED:
		/*
		* SPC-3 behavior is to report a UNIT ATTENTION with
		* ASC/ASCQ REPORTED LUNS DATA HAS CHANGED on every LUN
		* on the target, until a REPORT LUNS command is
		* received. SPC-4 behavior is to report it only once.
		* NOTE: scsi_debug_scsi_level does not use the same
		* values as struct scsi_device->scsi_level.
		*/
		if (scsi_debug_scsi_level >= 6) /* SPC-4 and above */
		clear_luns_changed_on_target(devip);
		mk_sense_buffer(SCpnt, UNIT_ATTENTION,
		TARGET_CHANGED_ASC,
		LUNS_CHANGED_ASCQ);
		if (debug)
		cp = "reported luns data has changed";
		break;
		default:
		pr_warn("%s: unexpected unit attention code=%d\n",
		__func__, k);
		@@ -3229,6 +3265,7 @@ static int resp_report_luns(struct scsi_cmnd * scp,
		unsigned char arr[SDEBUG_RLUN_ARR_SZ];
		unsigned char * max_addr;

		clear_luns_changed_on_target(devip);
		alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
		shortish = (alloc_len < 4);
		if (shortish \|\| (select_report > 2)) {
		@@ -4369,10 +4406,27 @@ static ssize_t max_luns_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_max_luns != n);
		scsi_debug_max_luns = n;
		sdebug_max_tgts_luns();
		if (changed && (scsi_debug_scsi_level >= 5)) { /* >= SPC-3 */
		struct sdebug_host_info *sdhp;
		struct sdebug_dev_info *dp;

		spin_lock(&sdebug_host_list_lock);
		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_LUNS_CHANGED,
		dp->uas_bm);
		}
		}
		spin_unlock(&sdebug_host_list_lock);
		}
		return count;
		}
		return -EINVAL;

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