148 строки
5.4 KiB
C
148 строки
5.4 KiB
C
/* -*- 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.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_ */
|