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authorDavid Disseldorp <ddiss@suse.de>2018-12-05 15:18:36 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2018-12-08 05:54:33 +0300
commit54a6f3f6a43cf5a5ad0421e4440a4c7095e7a223 (patch)
tree149939ec1898b3d300530c2906819426ded99a7e /drivers/target/target_core_configfs.c
parentb2da4abf26e859c6c17b49f6f728db0eaab9bc4a (diff)
downloadlinux-54a6f3f6a43cf5a5ad0421e4440a4c7095e7a223.tar.xz
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: David Disseldorp <ddiss@suse.de> Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/target/target_core_configfs.c')
-rw-r--r--drivers/target/target_core_configfs.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index aaf2a785e225..72016d0dfca5 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1226,6 +1226,74 @@ static struct t10_wwn *to_t10_wwn(struct config_item *item)
}
/*
+ * 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
*/
static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
@@ -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,