From: Tregaron Bayly <tregaron@xxxxxxxxxx>
Hi Nick,
This useful patch seems to have fallen through the cracks. Original
patch by Tregaron Bayly, I have fwd-ported it and cleaned up some
whitespace.
Tregaron, would you kindly reply to this email with a Signed-off-by
line like mine below, so this patch can be officially merged?
Thanks -- Andy
p.s. nab plz use "git am --scissors" to remove this txt from commit
------- 8< ----------
This patch changes LIO to use the configfs backend device name as the
model if you either change the DA_EMULATE_MODEL_ALIAS in
include/target/target_core_base.h before compiling (changes the default
behavior for all devices) or echo '1' to an individual device's
emulate_model_alias attribute (changes only that device).
Signed-off-by: Andy Grover <agrover@xxxxxxxxxx>
---
drivers/target/target_core_configfs.c | 4 ++++
drivers/target/target_core_device.c | 28 ++++++++++++++++++++++++++++
drivers/target/target_core_internal.h | 2 ++
include/target/target_core_base.h | 3 +++
4 files changed, 37 insertions(+), 0 deletions(-)
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 e269510..735784c 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -713,6 +713,20 @@ int se_dev_set_max_write_same_len(
return 0;
}
+int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
+{
+ if (flag != 0 && flag != 1) {
+ pr_err("Illegal value %d\n", flag);
+ return -EINVAL;
+ }
+
+ if (flag) {
+ dev_set_t10_wwn_model_alias(dev);
+ }
+
+ return 0;
+}
+
int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
@@ -1384,6 +1398,7 @@ 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;
@@ -1474,6 +1489,9 @@ int target_configure_device(struct se_device *dev)
dev->transport->inquiry_rev, 4);
}
+ if (dev->dev_attrib.emulate_model_alias)
+ dev_set_t10_wwn_model_alias(dev);
+
scsi_dump_inquiry(dev);
spin_lock(&hba->device_lock);
@@ -1545,6 +1563,16 @@ out_free_hba:
return ret;
}
+void dev_set_t10_wwn_model_alias(struct se_device *dev)
+{
+ const char *configname;
+
+ configname = config_item_name(&dev->dev_group.cg_item);
+ if (configname) {
+ strncpy(&dev->t10_wwn.model[0], configname, 16);
+ dev->t10_wwn.model[15] = '\0';
+ }
+}
void core_dev_release_virtual_lun0(void)
{
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 93e9c1f..572a947 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);
@@ -57,6 +58,7 @@ void core_dev_release_virtual_lun0(void);
struct se_device *target_alloc_device(struct se_hba *hba, const char *name);
int target_configure_device(struct se_device *dev);
void target_free_device(struct se_device *);
+void dev_set_t10_wwn_model_alias(struct se_device *dev);
/* target_core_hba.c */
struct se_hba *core_alloc_hba(const char *, u32, u32);
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 7cae236..650d3be 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 */
@@ -591,6 +593,7 @@ struct se_dev_entry {
};
struct se_dev_attrib {
+ int emulate_model_alias;
int emulate_dpo;
int emulate_fua_write;
int emulate_fua_read;
--
1.7.1
--
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