[PATCH] configfs: Convenience macros for attribute definition.
Sysfs has the _ATTR() and _ATTR_RO() macros to make defining extended form attributes easier. configfs should have something similiar. - _CONFIGFS_ATTR() and _CONFIGFS_ATTR_RO() are the counterparts to the sysfs macros. - CONFIGFS_ATTR_STRUCT() creates the extended form attribute structure. - CONFIGFS_ATTR_OPS() defines the show_attribute()/store_attribute() operations that call the show()/store() operations of the extended form configfs_attributes. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker
Mark Fasheh
parent
70526b6744
commit
ecb3d28c7e
4 changed files with 536 additions and 14 deletions
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@ -311,9 +311,20 @@ the subsystem must be ready for it.
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[An Example]
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The best example of these basic concepts is the simple_children
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subsystem/group and the simple_child item in configfs_example.c It
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shows a trivial object displaying and storing an attribute, and a simple
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group creating and destroying these children.
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subsystem/group and the simple_child item in configfs_example_explicit.c
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and configfs_example_macros.c. It shows a trivial object displaying and
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storing an attribute, and a simple group creating and destroying these
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children.
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The only difference between configfs_example_explicit.c and
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configfs_example_macros.c is how the attributes of the childless item
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are defined. The childless item has extended attributes, each with
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their own show()/store() operation. This follows a convention commonly
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used in sysfs. configfs_example_explicit.c creates these attributes
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by explicitly defining the structures involved. Conversely
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configfs_example_macros.c uses some convenience macros from configfs.h
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to define the attributes. These macros are similar to their sysfs
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counterparts.
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[Hierarchy Navigation and the Subsystem Mutex]
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@ -1,8 +1,10 @@
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/*
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* vim: noexpandtab ts=8 sts=0 sw=8:
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*
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* configfs_example.c - This file is a demonstration module containing
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* a number of configfs subsystems.
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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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*
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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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@ -281,7 +283,6 @@ static struct config_item *simple_children_make_item(struct config_group *group,
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if (!simple_child)
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return ERR_PTR(-ENOMEM);
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config_item_init_type_name(&simple_child->item, name,
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&simple_child_type);
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@ -302,8 +303,8 @@ static struct configfs_attribute *simple_children_attrs[] = {
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};
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static ssize_t simple_children_attr_show(struct config_item *item,
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struct configfs_attribute *attr,
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char *page)
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struct configfs_attribute *attr,
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char *page)
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{
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return sprintf(page,
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"[02-simple-children]\n"
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@ -318,7 +319,7 @@ static void simple_children_release(struct config_item *item)
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}
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static struct configfs_item_operations simple_children_item_ops = {
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.release = simple_children_release,
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.release = simple_children_release,
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.show_attribute = simple_children_attr_show,
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};
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@ -368,7 +369,6 @@ static struct config_group *group_children_make_group(struct config_group *group
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if (!simple_children)
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return ERR_PTR(-ENOMEM);
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config_group_init_type_name(&simple_children->group, name,
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&simple_children_type);
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@ -387,8 +387,8 @@ static struct configfs_attribute *group_children_attrs[] = {
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};
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static ssize_t group_children_attr_show(struct config_item *item,
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struct configfs_attribute *attr,
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char *page)
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struct configfs_attribute *attr,
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char *page)
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{
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return sprintf(page,
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"[03-group-children]\n"
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448
Documentation/filesystems/configfs/configfs_example_macros.c
Normal file
448
Documentation/filesystems/configfs/configfs_example_macros.c
Normal file
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@ -0,0 +1,448 @@
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/*
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* vim: noexpandtab ts=8 sts=0 sw=8:
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*
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* configfs_example_macros.c - This file is a demonstration module
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* containing a number of configfs subsystems. It uses the helper
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* macros defined by configfs.h
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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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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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CONFIGFS_ATTR_STRUCT(childless);
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#define CHILDLESS_ATTR(_name, _mode, _show, _store) \
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struct childless_attribute childless_attr_##_name = __CONFIGFS_ATTR(_name, _mode, _show, _store)
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#define CHILDLESS_ATTR_RO(_name, _show) \
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struct childless_attribute childless_attr_##_name = __CONFIGFS_ATTR_RO(_name, _show);
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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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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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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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CHILDLESS_ATTR_RO(showme, childless_showme_read);
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CHILDLESS_ATTR(storeme, S_IRUGO | S_IWUSR, childless_storeme_read,
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childless_storeme_write);
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CHILDLESS_ATTR_RO(description, childless_description_read);
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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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CONFIGFS_ATTR_OPS(childless);
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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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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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static struct config_item *simple_children_make_item(struct config_group *group, const char *name)
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{
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struct simple_child *simple_child;
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simple_child = kzalloc(sizeof(struct simple_child), GFP_KERNEL);
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if (!simple_child)
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return ERR_PTR(-ENOMEM);
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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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return &simple_child->item;
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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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struct configfs_attribute *attr,
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char *page)
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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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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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static struct configfs_item_operations simple_children_item_ops = {
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.release = simple_children_release,
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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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.ct_owner = THIS_MODULE,
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};
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static struct configfs_subsystem simple_children_subsys = {
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.su_group = {
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.cg_item = {
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.ci_namebuf = "02-simple-children",
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.ci_type = &simple_children_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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* 03-group-children
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*
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* This example reuses the simple_children group from above. However,
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* the simple_children group is not the subsystem itself, it is a
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* child of the subsystem. Creation of a group in the subsystem creates
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* a new simple_children group. That group can then have simple_child
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* children of its own.
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*/
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static struct config_group *group_children_make_group(struct config_group *group, const char *name)
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{
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struct simple_children *simple_children;
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simple_children = kzalloc(sizeof(struct simple_children),
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GFP_KERNEL);
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if (!simple_children)
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return ERR_PTR(-ENOMEM);
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config_group_init_type_name(&simple_children->group, name,
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&simple_children_type);
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return &simple_children->group;
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}
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static struct configfs_attribute group_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 *group_children_attrs[] = {
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&group_children_attr_description,
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NULL,
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};
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static ssize_t group_children_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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return sprintf(page,
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"[03-group-children]\n"
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"\n"
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"This subsystem allows the creation of child config_groups. These\n"
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"groups are like the subsystem simple-children.\n");
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}
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static struct configfs_item_operations group_children_item_ops = {
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.show_attribute = group_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 group_children_group_ops = {
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.make_group = group_children_make_group,
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};
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static struct config_item_type group_children_type = {
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.ct_item_ops = &group_children_item_ops,
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.ct_group_ops = &group_children_group_ops,
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.ct_attrs = group_children_attrs,
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.ct_owner = THIS_MODULE,
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};
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static struct configfs_subsystem group_children_subsys = {
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.su_group = {
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.cg_item = {
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.ci_namebuf = "03-group-children",
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.ci_type = &group_children_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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* We're now done with our subsystem definitions.
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* For convenience in this module, here's a list of them all. It
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* allows the init function to easily register them. Most modules
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* will only have one subsystem, and will only call register_subsystem
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* on it directly.
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*/
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||||
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);
|
||||
mutex_init(&subsys->su_mutex);
|
||||
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:
|
||||
for (; i >= 0; i--) {
|
||||
configfs_unregister_subsystem(example_subsys[i]);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit configfs_example_exit(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; example_subsys[i]; i++) {
|
||||
configfs_unregister_subsystem(example_subsys[i]);
|
||||
}
|
||||
}
|
||||
|
||||
module_init(configfs_example_init);
|
||||
module_exit(configfs_example_exit);
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -130,8 +130,25 @@ struct configfs_attribute {
|
|||
/*
|
||||
* 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. They can use
|
||||
* this macro (similar to sysfs' __ATTR) to make defining attributes easier.
|
||||
* 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 _item is the name of the
|
||||
* config_item structure.
|
||||
*/
|
||||
#define CONFIGFS_ATTR_STRUCT(_item) \
|
||||
struct _item##_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_ATTR(_name, _mode, _show, _store) \
|
||||
* struct myitem_attribute childless_attr_##_name = \
|
||||
* __CONFIGFS_ATTR(_name, _mode, _show, _store)
|
||||
*/
|
||||
#define __CONFIGFS_ATTR(_name, _mode, _show, _store) \
|
||||
{ \
|
||||
|
|
@ -143,6 +160,52 @@ struct configfs_attribute {
|
|||
.show = _show, \
|
||||
.store = _store, \
|
||||
}
|
||||
/* Here is a readonly version, only requiring a show() operation */
|
||||
#define __CONFIGFS_ATTR_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 _item is the name of the config_item structure.
|
||||
* This macro expects the attributes to be named "struct <name>_attribute"
|
||||
* and the function to_<name>() to exist;
|
||||
*/
|
||||
#define CONFIGFS_ATTR_OPS(_item) \
|
||||
static ssize_t _item##_attr_show(struct config_item *item, \
|
||||
struct configfs_attribute *attr, \
|
||||
char *page) \
|
||||
{ \
|
||||
struct _item *_item = to_##_item(item); \
|
||||
struct _item##_attribute *_item##_attr = \
|
||||
container_of(attr, struct _item##_attribute, attr); \
|
||||
ssize_t ret = 0; \
|
||||
\
|
||||
if (_item##_attr->show) \
|
||||
ret = _item##_attr->show(_item, page); \
|
||||
return ret; \
|
||||
} \
|
||||
static ssize_t _item##_attr_store(struct config_item *item, \
|
||||
struct configfs_attribute *attr, \
|
||||
const char *page, size_t count) \
|
||||
{ \
|
||||
struct _item *_item = to_##_item(item); \
|
||||
struct _item##_attribute *_item##_attr = \
|
||||
container_of(attr, struct _item##_attribute, attr); \
|
||||
ssize_t ret = -EINVAL; \
|
||||
\
|
||||
if (_item##_attr->store) \
|
||||
ret = _item##_attr->store(_item, page, count); \
|
||||
return ret; \
|
||||
}
|
||||
|
||||
/*
|
||||
* If allow_link() exists, the item can symlink(2) out to other
|
||||
|
|
|
|||
Loading…
Reference in a new issue