This patch changes LIO to use the configfs backend device name as the
model if you echo '1' to an individual device's emulate_model_alias attribute.
This is a valid operation only on devices with an export count of 0.
Signed-off-by: Tregaron Bayly <tbayly@xxxxxxxxxxxx>
---
drivers/target/target_core_configfs.c | 4 ++++
drivers/target/target_core_device.c | 40 +++++++++++++++++++++++++++++++++++
drivers/target/target_core_internal.h | 1 +
include/target/target_core_base.h | 3 +++
4 files changed, 48 insertions(+)
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 4efb61b..43b7ac6 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -609,6 +609,9 @@ static struct target_core_dev_attrib_attribute \
__CONFIGFS_EATTR_RO(_name, \
target_core_dev_show_attr_##_name);
+DEF_DEV_ATTRIB(emulate_model_alias);
+SE_DEV_ATTR(emulate_model_alias, S_IRUGO | S_IWUSR);
+
DEF_DEV_ATTRIB(emulate_dpo);
SE_DEV_ATTR(emulate_dpo, S_IRUGO | S_IWUSR);
@@ -681,6 +684,7 @@ SE_DEV_ATTR(max_write_same_len, S_IRUGO | S_IWUSR);
CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);
static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
+ &target_core_dev_attrib_emulate_model_alias.attr,
&target_core_dev_attrib_emulate_dpo.attr,
&target_core_dev_attrib_emulate_fua_write.attr,
&target_core_dev_attrib_emulate_fua_read.attr,
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 39d56eb..595bd80 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -713,6 +713,45 @@ int se_dev_set_max_write_same_len(
return 0;
}
+static void dev_set_t10_wwn_model_alias(struct se_device *dev)
+{
+ const char *configname;
+
+ configname = config_item_name(&dev->dev_group.cg_item);
+ strncpy(&dev->t10_wwn.model[0], configname, 16);
+ if (strlen(configname) >= 16) {
+ pr_warn("dev[%p]: Backstore name '%s' is too long for "
+ "INQUIRY_MODEL, truncating to 16 bytes", dev, configname);
+ }
+ dev->t10_wwn.model[15] = '\0';
+}
+
+int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
+{
+ if (dev->export_count) {
+ pr_err("dev[%p]: Unable to change model alias"
+ " while export_count is %d\n",
+ dev, dev->export_count);
+ return -EINVAL;
+ }
+
+ if (flag != 0 && flag != 1) {
+ pr_err("Illegal value %d\n", flag);
+ return -EINVAL;
+ }
+
+ if (flag) {
+ dev_set_t10_wwn_model_alias(dev);
+ }
+ else {
+ strncpy(&dev->t10_wwn.model[0],
+ dev->transport->inquiry_prod, 16);
+ }
+ dev->dev_attrib.emulate_model_alias = flag;
+
+ return 0;
+}
+
int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
@@ -1390,6 +1429,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
dev->t10_alua.t10_dev = dev;
dev->dev_attrib.da_dev = dev;
+ dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 93e9c1f..fdc51f8 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -25,6 +25,7 @@ int se_dev_set_max_unmap_block_desc_count(struct se_device *, u32);
int se_dev_set_unmap_granularity(struct se_device *, u32);
int se_dev_set_unmap_granularity_alignment(struct se_device *, u32);
int se_dev_set_max_write_same_len(struct se_device *, u32);
+int se_dev_set_emulate_model_alias(struct se_device *, int);
int se_dev_set_emulate_dpo(struct se_device *, int);
int se_dev_set_emulate_fua_write(struct se_device *, int);
int se_dev_set_emulate_fua_read(struct se_device *, int);
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 01e8601..d6b30d7 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -75,6 +75,8 @@
#define DA_MAX_WRITE_SAME_LEN 0
/* Default max transfer length */
#define DA_FABRIC_MAX_SECTORS 8192
+/* Use a model alias based on the configfs backend device name */
+#define DA_EMULATE_MODEL_ALIAS 0
/* Emulation for Direct Page Out */
#define DA_EMULATE_DPO 0
/* Emulation for Forced Unit Access WRITEs */
@@ -590,6 +592,7 @@ struct se_dev_entry {
};
struct se_dev_attrib {
+ int emulate_model_alias;
int emulate_dpo;
int emulate_fua_write;
int emulate_fua_read;
--
1.7.11.3
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