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-rw-r--r--include/target/configfs_macros.h147
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diff --git a/include/target/configfs_macros.h b/include/target/configfs_macros.h
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-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * configfs_macros.h - extends macros for configfs
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- *
- * Based on sysfs:
- * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
- *
- * Based on kobject.h:
- * Copyright (c) 2002-2003 Patrick Mochel
- * Copyright (c) 2002-2003 Open Source Development Labs
- *
- * configfs Copyright (C) 2005 Oracle. All rights reserved.
- *
- * Added CONFIGFS_EATTR() macros from original configfs.h macros
- * Copright (C) 2008-2009 Nicholas A. Bellinger <nab@linux-iscsi.org>
- *
- * Please read Documentation/filesystems/configfs/configfs.txt before using
- * the configfs interface, ESPECIALLY the parts about reference counts and
- * item destructors.
- */
-
-#ifndef _CONFIGFS_MACROS_H_
-#define _CONFIGFS_MACROS_H_
-
-#include <linux/configfs.h>
-
-/*
- * Users often need to create attribute structures for their configurable
- * attributes, containing a configfs_attribute member and function pointers
- * for the show() and store() operations on that attribute. If they don't
- * need anything else on the extended attribute structure, they can use
- * this macro to define it. The argument _name isends up as
- * 'struct _name_attribute, as well as names of to CONFIGFS_ATTR_OPS() below.
- * The argument _item is the name of the structure containing the
- * struct config_item or struct config_group structure members
- */
-#define CONFIGFS_EATTR_STRUCT(_name, _item) \
-struct _name##_attribute { \
- struct configfs_attribute attr; \
- ssize_t (*show)(struct _item *, char *); \
- ssize_t (*store)(struct _item *, const char *, size_t); \
-}
-
-/*
- * With the extended attribute structure, users can use this macro
- * (similar to sysfs' __ATTR) to make defining attributes easier.
- * An example:
- * #define MYITEM_EATTR(_name, _mode, _show, _store) \
- * struct myitem_attribute childless_attr_##_name = \
- * __CONFIGFS_EATTR(_name, _mode, _show, _store)
- */
-#define __CONFIGFS_EATTR(_name, _mode, _show, _store) \
-{ \
- .attr = { \
- .ca_name = __stringify(_name), \
- .ca_mode = _mode, \
- .ca_owner = THIS_MODULE, \
- }, \
- .show = _show, \
- .store = _store, \
-}
-/* Here is a readonly version, only requiring a show() operation */
-#define __CONFIGFS_EATTR_RO(_name, _show) \
-{ \
- .attr = { \
- .ca_name = __stringify(_name), \
- .ca_mode = 0444, \
- .ca_owner = THIS_MODULE, \
- }, \
- .show = _show, \
-}
-
-/*
- * With these extended attributes, the simple show_attribute() and
- * store_attribute() operations need to call the show() and store() of the
- * attributes. This is a common pattern, so we provide a macro to define
- * them. The argument _name is the name of the attribute defined by
- * CONFIGFS_ATTR_STRUCT(). The argument _item is the name of the structure
- * containing the struct config_item or struct config_group structure member.
- * The argument _item_member is the actual name of the struct config_* struct
- * in your _item structure. Meaning my_structure->some_config_group.
- * ^^_item^^^^^ ^^_item_member^^^
- * This macro expects the attributes to be named "struct <name>_attribute".
- */
-#define CONFIGFS_EATTR_OPS_TO_FUNC(_name, _item, _item_member) \
-static struct _item *to_##_name(struct config_item *ci) \
-{ \
- return (ci) ? container_of(to_config_group(ci), struct _item, \
- _item_member) : NULL; \
-}
-
-#define CONFIGFS_EATTR_OPS_SHOW(_name, _item) \
-static ssize_t _name##_attr_show(struct config_item *item, \
- struct configfs_attribute *attr, \
- char *page) \
-{ \
- struct _item *_item = to_##_name(item); \
- struct _name##_attribute * _name##_attr = \
- container_of(attr, struct _name##_attribute, attr); \
- ssize_t ret = 0; \
- \
- if (_name##_attr->show) \
- ret = _name##_attr->show(_item, page); \
- return ret; \
-}
-
-#define CONFIGFS_EATTR_OPS_STORE(_name, _item) \
-static ssize_t _name##_attr_store(struct config_item *item, \
- struct configfs_attribute *attr, \
- const char *page, size_t count) \
-{ \
- struct _item *_item = to_##_name(item); \
- struct _name##_attribute * _name##_attr = \
- container_of(attr, struct _name##_attribute, attr); \
- ssize_t ret = -EINVAL; \
- \
- if (_name##_attr->store) \
- ret = _name##_attr->store(_item, page, count); \
- return ret; \
-}
-
-#define CONFIGFS_EATTR_OPS(_name, _item, _item_member) \
- CONFIGFS_EATTR_OPS_TO_FUNC(_name, _item, _item_member); \
- CONFIGFS_EATTR_OPS_SHOW(_name, _item); \
- CONFIGFS_EATTR_OPS_STORE(_name, _item);
-
-#define CONFIGFS_EATTR_OPS_RO(_name, _item, _item_member) \
- CONFIGFS_EATTR_OPS_TO_FUNC(_name, _item, _item_member); \
- CONFIGFS_EATTR_OPS_SHOW(_name, _item);
-
-#endif /* _CONFIGFS_MACROS_H_ */

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