Commit 7a23f890 authored by Nicholas Bellinger's avatar Nicholas Bellinger
Browse files

target: Add target_core_backend_configfs.h helper macros 



This patch adds a number of configfs e-attr macros following
what existing target_core_configfs.c code does for internal
target_backend_dev_attrib setup, and similar to how target
fabric drivers allow for external config_item_type + cit->ct_attrs.
assignment.

This is useful for backend drivers like PSCSI who need to only
expose a small subset of device attributes, while still retaining
a default list of attributes for other backend drivers like
IBLOCK, FILEIO, RAMDISK, and TCMU.

Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent d23ab570

include/target/target_core_backend_configfs.h

0 → 100644
+53 −0
Original line number Diff line number Diff line 
#ifndef TARGET_CORE_BACKEND_CONFIGFS_H

#define TARGET_CORE_BACKEND_CONFIGFS_H



#include <target/configfs_macros.h>



#define DEF_TB_DEV_ATTRIB_SHOW(_backend, _name)				\

static ssize_t _backend##_dev_show_attr_##_name(			\

	struct se_dev_attrib *da,					\

	char *page)							\

{									\

	return snprintf(page, PAGE_SIZE, "%u\n",			\

			(u32)da->da_dev->dev_attrib._name);		\

}



#define DEF_TB_DEV_ATTRIB_STORE(_backend, _name)			\

static ssize_t _backend##_dev_store_attr_##_name(			\

	struct se_dev_attrib *da,					\

	const char *page,						\

	size_t count)							\

{									\

	unsigned long val;						\

	int ret;							\

									\

	ret = kstrtoul(page, 0, &val);					\

	if (ret < 0) {							\

		pr_err("kstrtoul() failed with ret: %d\n", ret);	\

		return -EINVAL;						\

	}								\

	ret = se_dev_set_##_name(da->da_dev, (u32)val);			\

									\

	return (!ret) ? count : -EINVAL;				\

}



#define DEF_TB_DEV_ATTRIB(_backend, _name)				\

DEF_TB_DEV_ATTRIB_SHOW(_backend, _name);				\

DEF_TB_DEV_ATTRIB_STORE(_backend, _name);



#define DEF_TB_DEV_ATTRIB_RO(_backend, name)				\

DEF_TB_DEV_ATTRIB_SHOW(_backend, name);



CONFIGFS_EATTR_STRUCT(target_backend_dev_attrib, se_dev_attrib);

#define TB_DEV_ATTR(_backend, _name, _mode)				\

static struct target_backend_dev_attrib_attribute _backend##_dev_attrib_##_name = \

		__CONFIGFS_EATTR(_name, _mode,				\

		_backend##_dev_show_attr_##_name,			\

		_backend##_dev_store_attr_##_name);



#define TB_DEV_ATTR_RO(_backend, _name)						\

static struct target_backend_dev_attrib_attribute _backend##_dev_attrib_##_name = \

	__CONFIGFS_EATTR_RO(_name,					\

	_backend##_dev_show_attr_##_name);



#endif /* TARGET_CORE_BACKEND_CONFIGFS_H */

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