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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>
This commit is contained in:
David Disseldorp 2018-12-05 13:18:36 +01:00 committed by Martin K. Petersen
parent b2da4abf26
commit 54a6f3f6a4
1 changed files with 70 additions and 0 deletions
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70
drivers/target/target_core_configfs.c
View File

@ -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,