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Commit 54a6f3f6 authored by David Disseldorp's avatar David Disseldorp Committed by Martin K. Petersen
Browse files

scsi: target: add device vendor_id configfs attribute 



The vendor_id attribute will allow for the modification of the T10 Vendor
Identification string returned in inquiry responses. Its value can be
viewed and modified via the ConfigFS path at:

target/core/$backstore/$name/wwn/vendor_id

"LIO-ORG" remains the default value, which is set when the backstore device
is enabled.

[mkp: corrected VPD page number]

Signed-off-by: default avatarDavid Disseldorp <ddiss@suse.de>
Reviewed-by: default avatarRoman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent b2da4abf

drivers/target/target_core_configfs.c

+70 −0
Original line number Diff line number Diff line
@@ -1225,6 +1225,74 @@ static struct t10_wwn *to_t10_wwn(struct config_item *item) 
	return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);

}



/*

 * STANDARD and VPD page 0x83 T10 Vendor Identification

 */

static ssize_t target_wwn_vendor_id_show(struct config_item *item,

		char *page)

{

	return sprintf(page, "%s\n", &to_t10_wwn(item)->vendor[0]);

}



static ssize_t target_wwn_vendor_id_store(struct config_item *item,

		const char *page, size_t count)

{

	struct t10_wwn *t10_wwn = to_t10_wwn(item);

	struct se_device *dev = t10_wwn->t10_dev;

	/* +2 to allow for a trailing (stripped) '\n' and null-terminator */

	unsigned char buf[INQUIRY_VENDOR_LEN + 2];

	char *stripped = NULL;

	size_t len;

	int i;



	len = strlcpy(buf, page, sizeof(buf));

	if (len < sizeof(buf)) {

		/* Strip any newline added from userspace. */

		stripped = strstrip(buf);

		len = strlen(stripped);

	}

	if (len > INQUIRY_VENDOR_LEN) {

		pr_err("Emulated T10 Vendor Identification exceeds"

			" INQUIRY_VENDOR_LEN: " __stringify(INQUIRY_VENDOR_LEN)

			"\n");

		return -EOVERFLOW;

	}



	/*

	 * SPC 4.3.1:

	 * ASCII data fields shall contain only ASCII printable characters (i.e.,

	 * code values 20h to 7Eh) and may be terminated with one or more ASCII

	 * null (00h) characters.

	 */

	for (i = 0; i < len; i++) {

		if ((stripped[i] < 0x20) || (stripped[i] > 0x7E)) {

			pr_err("Emulated T10 Vendor Identification contains"

				" non-ASCII-printable characters\n");

			return -EINVAL;

		}

	}



	/*

	 * Check to see if any active exports exist.  If they do exist, fail

	 * here as changing this information on the fly (underneath the

	 * initiator side OS dependent multipath code) could cause negative

	 * effects.

	 */

	if (dev->export_count) {

		pr_err("Unable to set T10 Vendor Identification while"

			" active %d exports exist\n", dev->export_count);

		return -EINVAL;

	}



	BUILD_BUG_ON(sizeof(dev->t10_wwn.vendor) != INQUIRY_VENDOR_LEN + 1);

	strlcpy(dev->t10_wwn.vendor, stripped, sizeof(dev->t10_wwn.vendor));



	pr_debug("Target_Core_ConfigFS: Set emulated T10 Vendor Identification:"

		 " %s\n", dev->t10_wwn.vendor);



	return count;

}



/*

 * VPD page 0x80 Unit serial

 */
@@ -1371,6 +1439,7 @@ DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10); 
/* VPD page 0x83 Association: SCSI Target Device */

DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);



CONFIGFS_ATTR(target_wwn_, vendor_id);

CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);

CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);

CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
@@ -1378,6 +1447,7 @@ CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port); 
CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);



static struct configfs_attribute *target_core_dev_wwn_attrs[] = {

	&target_wwn_attr_vendor_id,

	&target_wwn_attr_vpd_unit_serial,

	&target_wwn_attr_vpd_protocol_identifier,

	&target_wwn_attr_vpd_assoc_logical_unit,