2005-12-15 15:29:43 -07:00
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/*
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* vim: noexpandtab ts=8 sts=0 sw=8:
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*
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2008-06-18 20:29:05 -06:00
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* configfs_example_explicit.c - This file is a demonstration module
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* containing a number of configfs subsystems. It explicitly defines
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* each structure without using the helper macros defined in
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* configfs.h.
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2005-12-15 15:29:43 -07:00
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*
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* Based on sysfs:
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* sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
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*
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* configfs Copyright (C) 2005 Oracle. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/configfs.h>
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/*
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* 01-childless
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*
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* This first example is a childless subsystem. It cannot create
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* any config_items. It just has attributes.
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*
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* Note that we are enclosing the configfs_subsystem inside a container.
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* This is not necessary if a subsystem has no attributes directly
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* on the subsystem. See the next example, 02-simple-children, for
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* such a subsystem.
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*/
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struct childless {
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struct configfs_subsystem subsys;
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int showme;
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int storeme;
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};
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struct childless_attribute {
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struct configfs_attribute attr;
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ssize_t (*show)(struct childless *, char *);
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ssize_t (*store)(struct childless *, const char *, size_t);
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};
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static inline struct childless *to_childless(struct config_item *item)
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{
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return item ? container_of(to_configfs_subsystem(to_config_group(item)), struct childless, subsys) : NULL;
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}
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static ssize_t childless_showme_read(struct childless *childless,
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char *page)
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{
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ssize_t pos;
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pos = sprintf(page, "%d\n", childless->showme);
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childless->showme++;
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return pos;
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}
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static ssize_t childless_storeme_read(struct childless *childless,
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char *page)
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{
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return sprintf(page, "%d\n", childless->storeme);
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}
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static ssize_t childless_storeme_write(struct childless *childless,
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const char *page,
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size_t count)
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{
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unsigned long tmp;
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char *p = (char *) page;
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tmp = simple_strtoul(p, &p, 10);
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2010-11-18 13:27:32 -07:00
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if ((*p != '\0') && (*p != '\n'))
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2005-12-15 15:29:43 -07:00
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return -EINVAL;
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if (tmp > INT_MAX)
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return -ERANGE;
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childless->storeme = tmp;
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return count;
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}
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static ssize_t childless_description_read(struct childless *childless,
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char *page)
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{
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return sprintf(page,
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"[01-childless]\n"
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"\n"
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"The childless subsystem is the simplest possible subsystem in\n"
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"configfs. It does not support the creation of child config_items.\n"
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"It only has a few attributes. In fact, it isn't much different\n"
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"than a directory in /proc.\n");
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}
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static struct childless_attribute childless_attr_showme = {
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.attr = { .ca_owner = THIS_MODULE, .ca_name = "showme", .ca_mode = S_IRUGO },
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.show = childless_showme_read,
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};
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static struct childless_attribute childless_attr_storeme = {
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.attr = { .ca_owner = THIS_MODULE, .ca_name = "storeme", .ca_mode = S_IRUGO | S_IWUSR },
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.show = childless_storeme_read,
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.store = childless_storeme_write,
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};
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static struct childless_attribute childless_attr_description = {
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.attr = { .ca_owner = THIS_MODULE, .ca_name = "description", .ca_mode = S_IRUGO },
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.show = childless_description_read,
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};
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static struct configfs_attribute *childless_attrs[] = {
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&childless_attr_showme.attr,
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&childless_attr_storeme.attr,
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&childless_attr_description.attr,
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NULL,
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};
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static ssize_t childless_attr_show(struct config_item *item,
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struct configfs_attribute *attr,
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char *page)
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{
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struct childless *childless = to_childless(item);
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struct childless_attribute *childless_attr =
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container_of(attr, struct childless_attribute, attr);
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ssize_t ret = 0;
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if (childless_attr->show)
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ret = childless_attr->show(childless, page);
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return ret;
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}
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static ssize_t childless_attr_store(struct config_item *item,
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struct configfs_attribute *attr,
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const char *page, size_t count)
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{
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struct childless *childless = to_childless(item);
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struct childless_attribute *childless_attr =
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container_of(attr, struct childless_attribute, attr);
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ssize_t ret = -EINVAL;
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if (childless_attr->store)
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ret = childless_attr->store(childless, page, count);
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return ret;
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}
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static struct configfs_item_operations childless_item_ops = {
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.show_attribute = childless_attr_show,
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.store_attribute = childless_attr_store,
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};
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static struct config_item_type childless_type = {
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.ct_item_ops = &childless_item_ops,
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.ct_attrs = childless_attrs,
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.ct_owner = THIS_MODULE,
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};
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static struct childless childless_subsys = {
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.subsys = {
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.su_group = {
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.cg_item = {
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.ci_namebuf = "01-childless",
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.ci_type = &childless_type,
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},
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},
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},
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};
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/* ----------------------------------------------------------------- */
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/*
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* 02-simple-children
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*
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* This example merely has a simple one-attribute child. Note that
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* there is no extra attribute structure, as the child's attribute is
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* known from the get-go. Also, there is no container for the
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* subsystem, as it has no attributes of its own.
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*/
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struct simple_child {
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struct config_item item;
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int storeme;
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};
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static inline struct simple_child *to_simple_child(struct config_item *item)
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{
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return item ? container_of(item, struct simple_child, item) : NULL;
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}
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static struct configfs_attribute simple_child_attr_storeme = {
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.ca_owner = THIS_MODULE,
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.ca_name = "storeme",
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.ca_mode = S_IRUGO | S_IWUSR,
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};
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static struct configfs_attribute *simple_child_attrs[] = {
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&simple_child_attr_storeme,
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NULL,
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};
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static ssize_t simple_child_attr_show(struct config_item *item,
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struct configfs_attribute *attr,
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char *page)
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{
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ssize_t count;
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struct simple_child *simple_child = to_simple_child(item);
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count = sprintf(page, "%d\n", simple_child->storeme);
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return count;
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}
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static ssize_t simple_child_attr_store(struct config_item *item,
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struct configfs_attribute *attr,
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const char *page, size_t count)
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{
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struct simple_child *simple_child = to_simple_child(item);
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unsigned long tmp;
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char *p = (char *) page;
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tmp = simple_strtoul(p, &p, 10);
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if (!p || (*p && (*p != '\n')))
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return -EINVAL;
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if (tmp > INT_MAX)
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return -ERANGE;
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simple_child->storeme = tmp;
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return count;
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}
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static void simple_child_release(struct config_item *item)
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{
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kfree(to_simple_child(item));
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}
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static struct configfs_item_operations simple_child_item_ops = {
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.release = simple_child_release,
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.show_attribute = simple_child_attr_show,
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.store_attribute = simple_child_attr_store,
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};
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static struct config_item_type simple_child_type = {
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.ct_item_ops = &simple_child_item_ops,
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.ct_attrs = simple_child_attrs,
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.ct_owner = THIS_MODULE,
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};
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2006-04-12 19:34:43 -06:00
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struct simple_children {
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struct config_group group;
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};
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static inline struct simple_children *to_simple_children(struct config_item *item)
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{
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return item ? container_of(to_config_group(item), struct simple_children, group) : NULL;
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}
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2008-07-17 15:53:48 -06:00
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static struct config_item *simple_children_make_item(struct config_group *group, const char *name)
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2005-12-15 15:29:43 -07:00
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{
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struct simple_child *simple_child;
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some kmalloc/memset ->kzalloc (tree wide)
Transform some calls to kmalloc/memset to a single kzalloc (or kcalloc).
Here is a short excerpt of the semantic patch performing
this transformation:
@@
type T2;
expression x;
identifier f,fld;
expression E;
expression E1,E2;
expression e1,e2,e3,y;
statement S;
@@
x =
- kmalloc
+ kzalloc
(E1,E2)
... when != \(x->fld=E;\|y=f(...,x,...);\|f(...,x,...);\|x=E;\|while(...) S\|for(e1;e2;e3) S\)
- memset((T2)x,0,E1);
@@
expression E1,E2,E3;
@@
- kzalloc(E1 * E2,E3)
+ kcalloc(E1,E2,E3)
[akpm@linux-foundation.org: get kcalloc args the right way around]
Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <bryan.wu@analog.com>
Acked-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Acked-by: Roland Dreier <rolandd@cisco.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Acked-by: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Greg KH <greg@kroah.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-19 02:49:03 -06:00
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simple_child = kzalloc(sizeof(struct simple_child), GFP_KERNEL);
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2005-12-15 15:29:43 -07:00
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if (!simple_child)
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2008-07-17 16:21:29 -06:00
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return ERR_PTR(-ENOMEM);
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2005-12-15 15:29:43 -07:00
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config_item_init_type_name(&simple_child->item, name,
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&simple_child_type);
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simple_child->storeme = 0;
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2008-07-17 15:53:48 -06:00
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return &simple_child->item;
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2005-12-15 15:29:43 -07:00
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}
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static struct configfs_attribute simple_children_attr_description = {
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.ca_owner = THIS_MODULE,
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.ca_name = "description",
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.ca_mode = S_IRUGO,
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};
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static struct configfs_attribute *simple_children_attrs[] = {
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&simple_children_attr_description,
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NULL,
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};
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static ssize_t simple_children_attr_show(struct config_item *item,
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2008-06-18 20:29:05 -06:00
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struct configfs_attribute *attr,
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char *page)
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2005-12-15 15:29:43 -07:00
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{
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return sprintf(page,
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"[02-simple-children]\n"
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"\n"
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"This subsystem allows the creation of child config_items. These\n"
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"items have only one attribute that is readable and writeable.\n");
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}
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2006-04-12 19:34:43 -06:00
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static void simple_children_release(struct config_item *item)
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{
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kfree(to_simple_children(item));
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}
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2005-12-15 15:29:43 -07:00
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static struct configfs_item_operations simple_children_item_ops = {
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2008-06-18 20:29:05 -06:00
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.release = simple_children_release,
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2005-12-15 15:29:43 -07:00
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.show_attribute = simple_children_attr_show,
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};
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/*
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* Note that, since no extra work is required on ->drop_item(),
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* no ->drop_item() is provided.
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*/
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static struct configfs_group_operations simple_children_group_ops = {
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.make_item = simple_children_make_item,
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};
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static struct config_item_type simple_children_type = {
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.ct_item_ops = &simple_children_item_ops,
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.ct_group_ops = &simple_children_group_ops,
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.ct_attrs = simple_children_attrs,
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2006-01-25 14:31:07 -07:00
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.ct_owner = THIS_MODULE,
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2005-12-15 15:29:43 -07:00
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};
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|
|
static struct configfs_subsystem simple_children_subsys = {
|
|
|
|
.su_group = {
|
|
|
|
.cg_item = {
|
|
|
|
.ci_namebuf = "02-simple-children",
|
|
|
|
.ci_type = &simple_children_type,
|
|
|
|
},
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
/* ----------------------------------------------------------------- */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 03-group-children
|
|
|
|
*
|
|
|
|
* This example reuses the simple_children group from above. However,
|
|
|
|
* the simple_children group is not the subsystem itself, it is a
|
|
|
|
* child of the subsystem. Creation of a group in the subsystem creates
|
|
|
|
* a new simple_children group. That group can then have simple_child
|
|
|
|
* children of its own.
|
|
|
|
*/
|
|
|
|
|
2008-07-17 15:53:48 -06:00
|
|
|
static struct config_group *group_children_make_group(struct config_group *group, const char *name)
|
2005-12-15 15:29:43 -07:00
|
|
|
{
|
|
|
|
struct simple_children *simple_children;
|
|
|
|
|
some kmalloc/memset ->kzalloc (tree wide)
Transform some calls to kmalloc/memset to a single kzalloc (or kcalloc).
Here is a short excerpt of the semantic patch performing
this transformation:
@@
type T2;
expression x;
identifier f,fld;
expression E;
expression E1,E2;
expression e1,e2,e3,y;
statement S;
@@
x =
- kmalloc
+ kzalloc
(E1,E2)
... when != \(x->fld=E;\|y=f(...,x,...);\|f(...,x,...);\|x=E;\|while(...) S\|for(e1;e2;e3) S\)
- memset((T2)x,0,E1);
@@
expression E1,E2,E3;
@@
- kzalloc(E1 * E2,E3)
+ kcalloc(E1,E2,E3)
[akpm@linux-foundation.org: get kcalloc args the right way around]
Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <bryan.wu@analog.com>
Acked-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Acked-by: Roland Dreier <rolandd@cisco.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Acked-by: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Greg KH <greg@kroah.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-19 02:49:03 -06:00
|
|
|
simple_children = kzalloc(sizeof(struct simple_children),
|
2005-12-15 15:29:43 -07:00
|
|
|
GFP_KERNEL);
|
|
|
|
if (!simple_children)
|
2008-07-17 16:21:29 -06:00
|
|
|
return ERR_PTR(-ENOMEM);
|
2005-12-15 15:29:43 -07:00
|
|
|
|
|
|
|
config_group_init_type_name(&simple_children->group, name,
|
|
|
|
&simple_children_type);
|
|
|
|
|
2008-07-17 15:53:48 -06:00
|
|
|
return &simple_children->group;
|
2005-12-15 15:29:43 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct configfs_attribute group_children_attr_description = {
|
|
|
|
.ca_owner = THIS_MODULE,
|
|
|
|
.ca_name = "description",
|
|
|
|
.ca_mode = S_IRUGO,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct configfs_attribute *group_children_attrs[] = {
|
|
|
|
&group_children_attr_description,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
static ssize_t group_children_attr_show(struct config_item *item,
|
2008-06-18 20:29:05 -06:00
|
|
|
struct configfs_attribute *attr,
|
|
|
|
char *page)
|
2005-12-15 15:29:43 -07:00
|
|
|
{
|
|
|
|
return sprintf(page,
|
|
|
|
"[03-group-children]\n"
|
|
|
|
"\n"
|
|
|
|
"This subsystem allows the creation of child config_groups. These\n"
|
|
|
|
"groups are like the subsystem simple-children.\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct configfs_item_operations group_children_item_ops = {
|
|
|
|
.show_attribute = group_children_attr_show,
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Note that, since no extra work is required on ->drop_item(),
|
|
|
|
* no ->drop_item() is provided.
|
|
|
|
*/
|
|
|
|
static struct configfs_group_operations group_children_group_ops = {
|
|
|
|
.make_group = group_children_make_group,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct config_item_type group_children_type = {
|
|
|
|
.ct_item_ops = &group_children_item_ops,
|
|
|
|
.ct_group_ops = &group_children_group_ops,
|
|
|
|
.ct_attrs = group_children_attrs,
|
2006-01-25 14:31:07 -07:00
|
|
|
.ct_owner = THIS_MODULE,
|
2005-12-15 15:29:43 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct configfs_subsystem group_children_subsys = {
|
|
|
|
.su_group = {
|
|
|
|
.cg_item = {
|
|
|
|
.ci_namebuf = "03-group-children",
|
|
|
|
.ci_type = &group_children_type,
|
|
|
|
},
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
/* ----------------------------------------------------------------- */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We're now done with our subsystem definitions.
|
|
|
|
* For convenience in this module, here's a list of them all. It
|
|
|
|
* allows the init function to easily register them. Most modules
|
|
|
|
* will only have one subsystem, and will only call register_subsystem
|
|
|
|
* on it directly.
|
|
|
|
*/
|
|
|
|
static struct configfs_subsystem *example_subsys[] = {
|
|
|
|
&childless_subsys.subsys,
|
|
|
|
&simple_children_subsys,
|
|
|
|
&group_children_subsys,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init configfs_example_init(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
int i;
|
|
|
|
struct configfs_subsystem *subsys;
|
|
|
|
|
|
|
|
for (i = 0; example_subsys[i]; i++) {
|
|
|
|
subsys = example_subsys[i];
|
|
|
|
|
|
|
|
config_group_init(&subsys->su_group);
|
2007-07-07 00:33:17 -06:00
|
|
|
mutex_init(&subsys->su_mutex);
|
2005-12-15 15:29:43 -07:00
|
|
|
ret = configfs_register_subsystem(subsys);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR "Error %d while registering subsystem %s\n",
|
|
|
|
ret,
|
|
|
|
subsys->su_group.cg_item.ci_namebuf);
|
|
|
|
goto out_unregister;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
out_unregister:
|
2011-05-26 17:25:17 -06:00
|
|
|
for (i--; i >= 0; i--)
|
2005-12-15 15:29:43 -07:00
|
|
|
configfs_unregister_subsystem(example_subsys[i]);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit configfs_example_exit(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
2011-05-26 17:25:17 -06:00
|
|
|
for (i = 0; example_subsys[i]; i++)
|
2005-12-15 15:29:43 -07:00
|
|
|
configfs_unregister_subsystem(example_subsys[i]);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(configfs_example_init);
|
|
|
|
module_exit(configfs_example_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|