On 11/28/18 5:01 PM, David Disseldorp wrote:
> 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.
>
> Signed-off-by: David Disseldorp <dd...@suse.de>
> ---
> drivers/target/target_core_configfs.c | 48
> +++++++++++++++++++++++++++++++++++
> 1 file changed, 48 insertions(+)
>
> diff --git a/drivers/target/target_core_configfs.c
> b/drivers/target/target_core_configfs.c
> index 9f49b1afd685..fc60c4db718d 100644
> --- a/drivers/target/target_core_configfs.c
> +++ b/drivers/target/target_core_configfs.c
> @@ -1213,6 +1213,52 @@ static struct t10_wwn *to_t10_wwn(struct config_item
> *item)
> }
>
> /*
> + * STANDARD and VPD page 0x80 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;
> + unsigned char buf[INQUIRY_VENDOR_LEN + 1];
> +
> + if (strlen(page) > INQUIRY_VENDOR_LEN) {
> + pr_err("Emulated T10 Vendor Identification exceeds"
> + " INQUIRY_VENDOR_LEN: " __stringify(INQUIRY_VENDOR_LEN)
> + "\n");
> + return -EOVERFLOW;
> + }
> + strlcpy(buf, page, sizeof(buf));
> + /*
> + * 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;
> + }
> +
> + /* Assume ASCII encoding. Strip any newline added from userspace. */
> + BUILD_BUG_ON(sizeof(dev->t10_wwn.vendor) != INQUIRY_VENDOR_LEN + 1);
> + strlcpy(dev->t10_wwn.vendor, strstrip(buf),
> + 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,
> @@ -1358,6 +1404,7 @@ 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);
> @@ -1365,6 +1412,7 @@ 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,
>
Reviewed-by: Lee Duncan <ldun...@suse.com>
