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Commit 9a8bb606 authored by Bryant G. Ly's avatar Bryant G. Ly Committed by Nicholas Bellinger
Browse files

tcmu: Support emulate_write_cache 



This will enable the toggling of write_cache in tcmu through targetcli-fb

Signed-off-by: default avatarBryant G. Ly <bryantly@linux.vnet.ibm.com>
Reviewed-By: default avatarMike Christie <mchristi@redhat.com>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent e9447a46

drivers/target/target_core_user.c

+30 −0
Original line number Diff line number Diff line
@@ -1290,6 +1290,8 @@ static int tcmu_configure_device(struct se_device *dev) 
	/* Other attributes can be configured in userspace */

	if (!dev->dev_attrib.hw_max_sectors)

		dev->dev_attrib.hw_max_sectors = 128;

	if (!dev->dev_attrib.emulate_write_cache)

		dev->dev_attrib.emulate_write_cache = 0;

	dev->dev_attrib.hw_queue_depth = 128;



	/*
@@ -1546,6 +1548,32 @@ static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *pag 
}

CONFIGFS_ATTR(tcmu_, cmd_time_out);



static ssize_t tcmu_emulate_write_cache_show(struct config_item *item,

					     char *page)

{

	struct se_dev_attrib *da = container_of(to_config_group(item),

					struct se_dev_attrib, da_group);



	return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache);

}



static ssize_t tcmu_emulate_write_cache_store(struct config_item *item,

					      const char *page, size_t count)

{

	struct se_dev_attrib *da = container_of(to_config_group(item),

					struct se_dev_attrib, da_group);

	int val;

	int ret;



	ret = kstrtouint(page, 0, &val);

	if (ret < 0)

		return ret;



	da->emulate_write_cache = val;

	return count;

}

CONFIGFS_ATTR(tcmu_, emulate_write_cache);



static struct configfs_attribute **tcmu_attrs;



static struct target_backend_ops tcmu_ops = {
@@ -1682,6 +1710,8 @@ static int __init tcmu_module_init(void) 
		tcmu_attrs[i] = passthrough_attrib_attrs[i];

	}

	tcmu_attrs[i] = &tcmu_attr_cmd_time_out;

	i++;

	tcmu_attrs[i] = &tcmu_attr_emulate_write_cache;

	tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs;



	ret = transport_backend_register(&tcmu_ops);