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configfs: remove old API

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Remove the old show_attribute and store_attribute methods and update
the documentation.  Also replace the two C samples with a single new
one in the proper samples directory where people expect to find it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2015-10-03 15:32:59 +02:00 committed by Nicholas Bellinger
parent 45b997737a
commit 517982229f
10 changed files with 73 additions and 701 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/filesystems/Makefile
View File

@ -1,5 +1,3 @@
subdir-y := configfs
# List of programs to build
hostprogs-y := dnotify_test

3
Documentation/filesystems/configfs/Makefile
View File

@ -1,3 +0,0 @@
ifneq ($(CONFIG_CONFIGFS_FS),)
obj-m += configfs_example_explicit.o configfs_example_macros.o
endif

38
Documentation/filesystems/configfs/configfs.txt
View File

@ -160,12 +160,6 @@ among other things. For that, it needs a type.
struct configfs_item_operations {
void (*release)(struct config_item *);
ssize_t (*show_attribute)(struct config_item *,
struct configfs_attribute *,
char *);
ssize_t (*store_attribute)(struct config_item *,
struct configfs_attribute *,
const char *, size_t);
int (*allow_link)(struct config_item *src,
struct config_item *target);
int (*drop_link)(struct config_item *src,
@ -183,9 +177,7 @@ The most basic function of a config_item_type is to define what
operations can be performed on a config_item. All items that have been
allocated dynamically will need to provide the ct_item_ops->release()
method. This method is called when the config_item's reference count
reaches zero. Items that wish to display an attribute need to provide
the ct_item_ops->show_attribute() method. Similarly, storing a new
attribute value uses the store_attribute() method.
reaches zero.
[struct configfs_attribute]
@ -193,6 +185,8 @@ attribute value uses the store_attribute() method.
char *ca_name;
struct module *ca_owner;
umode_t ca_mode;
ssize_t (*show)(struct config_item *, char *);
ssize_t (*store)(struct config_item *, const char *, size_t);
};
When a config_item wants an attribute to appear as a file in the item's
@ -202,10 +196,10 @@ config_item_type->ct_attrs. When the item appears in configfs, the
attribute file will appear with the configfs_attribute->ca_name
filename. configfs_attribute->ca_mode specifies the file permissions.
If an attribute is readable and the config_item provides a
ct_item_ops->show_attribute() method, that method will be called
whenever userspace asks for a read(2) on the attribute. The converse
will happen for write(2).
If an attribute is readable and provides a ->show method, that method will
be called whenever userspace asks for a read(2) on the attribute. If an
attribute is writable and provides a ->store method, that method will be
be called whenever userspace asks for a write(2) on the attribute.
[struct config_group]
@ -311,20 +305,10 @@ the subsystem must be ready for it.
[An Example]
The best example of these basic concepts is the simple_children
subsystem/group and the simple_child item in configfs_example_explicit.c
and configfs_example_macros.c. It shows a trivial object displaying and
storing an attribute, and a simple group creating and destroying these
children.
The only difference between configfs_example_explicit.c and
configfs_example_macros.c is how the attributes of the childless item
are defined. The childless item has extended attributes, each with
their own show()/store() operation. This follows a convention commonly
used in sysfs. configfs_example_explicit.c creates these attributes
by explicitly defining the structures involved. Conversely
configfs_example_macros.c uses some convenience macros from configfs.h
to define the attributes. These macros are similar to their sysfs
counterparts.
subsystem/group and the simple_child item in
samples/configfs/configfs_sample.c. It shows a trivial object displaying
and storing an attribute, and a simple group creating and destroying
these children.
[Hierarchy Navigation and the Subsystem Mutex]

483
Documentation/filesystems/configfs/configfs_example_explicit.c
View File

@ -1,483 +0,0 @@
/*
* vim: noexpandtab ts=8 sts=0 sw=8:
*
* configfs_example_explicit.c - This file is a demonstration module
* containing a number of configfs subsystems. It explicitly defines
* each structure without using the helper macros defined in
* configfs.h.
*
* 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
*
* configfs Copyright (C) 2005 Oracle. All rights reserved.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/configfs.h>
/*
* 01-childless
*
* This first example is a childless subsystem. It cannot create
* any config_items. It just has attributes.
*
* Note that we are enclosing the configfs_subsystem inside a container.
* This is not necessary if a subsystem has no attributes directly
* on the subsystem. See the next example, 02-simple-children, for
* such a subsystem.
*/
struct childless {
struct configfs_subsystem subsys;
int showme;
int storeme;
};
struct childless_attribute {
struct configfs_attribute attr;
ssize_t (*show)(struct childless *, char *);
ssize_t (*store)(struct childless *, const char *, size_t);
};
static inline struct childless *to_childless(struct config_item *item)
{
return item ? container_of(to_configfs_subsystem(to_config_group(item)), struct childless, subsys) : NULL;
}
static ssize_t childless_showme_read(struct childless *childless,
char *page)
{
ssize_t pos;
pos = sprintf(page, "%d\n", childless->showme);
childless->showme++;
return pos;
}
static ssize_t childless_storeme_read(struct childless *childless,
char *page)
{
return sprintf(page, "%d\n", childless->storeme);
}
static ssize_t childless_storeme_write(struct childless *childless,
const char *page,
size_t count)
{
unsigned long tmp;
char *p = (char *) page;
tmp = simple_strtoul(p, &p, 10);
if ((*p != '\0') && (*p != '\n'))
return -EINVAL;
if (tmp > INT_MAX)
return -ERANGE;
childless->storeme = tmp;
return count;
}
static ssize_t childless_description_read(struct childless *childless,
char *page)
{
return sprintf(page,
"[01-childless]\n"
"\n"
"The childless subsystem is the simplest possible subsystem in\n"
"configfs. It does not support the creation of child config_items.\n"
"It only has a few attributes. In fact, it isn't much different\n"
"than a directory in /proc.\n");
}
static struct childless_attribute childless_attr_showme = {
.attr = { .ca_owner = THIS_MODULE, .ca_name = "showme", .ca_mode = S_IRUGO },
.show = childless_showme_read,
};
static struct childless_attribute childless_attr_storeme = {
.attr = { .ca_owner = THIS_MODULE, .ca_name = "storeme", .ca_mode = S_IRUGO | S_IWUSR },
.show = childless_storeme_read,
.store = childless_storeme_write,
};
static struct childless_attribute childless_attr_description = {
.attr = { .ca_owner = THIS_MODULE, .ca_name = "description", .ca_mode = S_IRUGO },
.show = childless_description_read,
};
static struct configfs_attribute *childless_attrs[] = {
&childless_attr_showme.attr,
&childless_attr_storeme.attr,
&childless_attr_description.attr,
NULL,
};
static ssize_t childless_attr_show(struct config_item *item,
struct configfs_attribute *attr,
char *page)
{
struct childless *childless = to_childless(item);
struct childless_attribute *childless_attr =
container_of(attr, struct childless_attribute, attr);
ssize_t ret = 0;
if (childless_attr->show)
ret = childless_attr->show(childless, page);
return ret;
}
static ssize_t childless_attr_store(struct config_item *item,
struct configfs_attribute *attr,
const char *page, size_t count)
{
struct childless *childless = to_childless(item);
struct childless_attribute *childless_attr =
container_of(attr, struct childless_attribute, attr);
ssize_t ret = -EINVAL;
if (childless_attr->store)
ret = childless_attr->store(childless, page, count);
return ret;
}
static struct configfs_item_operations childless_item_ops = {
.show_attribute = childless_attr_show,
.store_attribute = childless_attr_store,
};
static struct config_item_type childless_type = {
.ct_item_ops = &childless_item_ops,
.ct_attrs = childless_attrs,
.ct_owner = THIS_MODULE,
};
static struct childless childless_subsys = {
.subsys = {
.su_group = {
.cg_item = {
.ci_namebuf = "01-childless",
.ci_type = &childless_type,
},
},
},
};
/* ----------------------------------------------------------------- */
/*
* 02-simple-children
*
* This example merely has a simple one-attribute child. Note that
* there is no extra attribute structure, as the child's attribute is
* known from the get-go. Also, there is no container for the
* subsystem, as it has no attributes of its own.
*/
struct simple_child {
struct config_item item;
int storeme;
};
static inline struct simple_child *to_simple_child(struct config_item *item)
{
return item ? container_of(item, struct simple_child, item) : NULL;
}
static struct configfs_attribute simple_child_attr_storeme = {
.ca_owner = THIS_MODULE,
.ca_name = "storeme",
.ca_mode = S_IRUGO | S_IWUSR,
};
static struct configfs_attribute *simple_child_attrs[] = {
&simple_child_attr_storeme,
NULL,
};
static ssize_t simple_child_attr_show(struct config_item *item,
struct configfs_attribute *attr,
char *page)
{
ssize_t count;
struct simple_child *simple_child = to_simple_child(item);
count = sprintf(page, "%d\n", simple_child->storeme);
return count;
}
static ssize_t simple_child_attr_store(struct config_item *item,
struct configfs_attribute *attr,
const char *page, size_t count)
{
struct simple_child *simple_child = to_simple_child(item);
unsigned long tmp;
char *p = (char *) page;
tmp = simple_strtoul(p, &p, 10);
if (!p || (*p && (*p != '\n')))
return -EINVAL;
if (tmp > INT_MAX)
return -ERANGE;
simple_child->storeme = tmp;
return count;
}
static void simple_child_release(struct config_item *item)
{
kfree(to_simple_child(item));
}
static struct configfs_item_operations simple_child_item_ops = {
.release = simple_child_release,
.show_attribute = simple_child_attr_show,
.store_attribute = simple_child_attr_store,
};
static struct config_item_type simple_child_type = {
.ct_item_ops = &simple_child_item_ops,
.ct_attrs = simple_child_attrs,
.ct_owner = THIS_MODULE,
};
struct simple_children {
struct config_group group;
};
static inline struct simple_children *to_simple_children(struct config_item *item)
{
return item ? container_of(to_config_group(item), struct simple_children, group) : NULL;
}
static struct config_item *simple_children_make_item(struct config_group *group, const char *name)
{
struct simple_child *simple_child;
simple_child = kzalloc(sizeof(struct simple_child), GFP_KERNEL);
if (!simple_child)
return ERR_PTR(-ENOMEM);
config_item_init_type_name(&simple_child->item, name,
&simple_child_type);
simple_child->storeme = 0;
return &simple_child->item;
}
static struct configfs_attribute simple_children_attr_description = {
.ca_owner = THIS_MODULE,
.ca_name = "description",
.ca_mode = S_IRUGO,
};
static struct configfs_attribute *simple_children_attrs[] = {
&simple_children_attr_description,
NULL,
};
static ssize_t simple_children_attr_show(struct config_item *item,
struct configfs_attribute *attr,
char *page)
{
return sprintf(page,
"[02-simple-children]\n"
"\n"
"This subsystem allows the creation of child config_items. These\n"
"items have only one attribute that is readable and writeable.\n");
}
static void simple_children_release(struct config_item *item)
{
kfree(to_simple_children(item));
}
static struct configfs_item_operations simple_children_item_ops = {
.release = simple_children_release,
.show_attribute = simple_children_attr_show,
};
/*
* Note that, since no extra work is required on ->drop_item(),
* no ->drop_item() is provided.
*/
static struct configfs_group_operations simple_children_group_ops = {
.make_item = simple_children_make_item,
};
static struct config_item_type simple_children_type = {
.ct_item_ops = &simple_children_item_ops,
.ct_group_ops = &simple_children_group_ops,
.ct_attrs = simple_children_attrs,
.ct_owner = THIS_MODULE,
};
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.
*/
static struct config_group *group_children_make_group(struct config_group *group, const char *name)
{
struct simple_children *simple_children;
simple_children = kzalloc(sizeof(struct simple_children),
GFP_KERNEL);
if (!simple_children)
return ERR_PTR(-ENOMEM);
config_group_init_type_name(&simple_children->group, name,
&simple_children_type);
return &simple_children->group;
}
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,
struct configfs_attribute *attr,
char *page)
{
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,
.ct_owner = THIS_MODULE,
};
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);
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--; 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");

15
fs/configfs/file.c
View File

@ -65,7 +65,6 @@ static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buf
{
struct configfs_attribute * attr = to_attr(dentry);
struct config_item * item = to_item(dentry->d_parent);
struct configfs_item_operations * ops = buffer->ops;
int ret = 0;
ssize_t count;
@ -74,10 +73,7 @@ static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buf
if (!buffer->page)
return -ENOMEM;
if (ops->show_attribute)
count = ops->show_attribute(item, attr, buffer->page);
else
count = attr->show(item, buffer->page);
count = attr->show(item, buffer->page);
buffer->needs_read_fill = 0;
BUG_ON(count > (ssize_t)SIMPLE_ATTR_SIZE);
@ -175,10 +171,7 @@ flush_write_buffer(struct dentry * dentry, struct configfs_buffer * buffer, size
{
struct configfs_attribute * attr = to_attr(dentry);
struct config_item * item = to_item(dentry->d_parent);
struct configfs_item_operations * ops = buffer->ops;
if (ops->store_attribute)
return ops->store_attribute(item, attr, buffer->page, count);
return attr->store(item, buffer->page, count);
}
@ -243,8 +236,7 @@ static int check_perm(struct inode * inode, struct file * file)
* and we must have a store method.
*/
if (file->f_mode & FMODE_WRITE) {
if (!(inode->i_mode & S_IWUGO) ||
(!ops->store_attribute && !attr->store))
if (!(inode->i_mode & S_IWUGO) || !attr->store)
goto Eaccess;
}
@ -254,8 +246,7 @@ static int check_perm(struct inode * inode, struct file * file)
* must be a show method for it.
*/
if (file->f_mode & FMODE_READ) {
if (!(inode->i_mode & S_IRUGO) ||
(!ops->show_attribute && !attr->show))
if (!(inode->i_mode & S_IRUGO) || !attr->show)
goto Eaccess;
}

82
include/linux/configfs.h
View File

@ -154,86 +154,6 @@ static struct configfs_attribute _pfx##attr_##_name = { \
.store = _pfx##_name##_store, \
}
/*
* 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 _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) \
{ \
.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_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
* items. If the item is a group, it may support mkdir(2).
@ -250,8 +170,6 @@ static ssize_t _item##_attr_store(struct config_item *item, \
*/
struct configfs_item_operations {
void (*release)(struct config_item *);
ssize_t (*show_attribute)(struct config_item *, struct configfs_attribute *,char *);
ssize_t (*store_attribute)(struct config_item *,struct configfs_attribute *,const char *, size_t);
int (*allow_link)(struct config_item *src, struct config_item *target);
int (*drop_link)(struct config_item *src, struct config_item *target);
};

6
samples/Kconfig
View File

@ -70,4 +70,10 @@ config SAMPLE_LIVEPATCH
Builds a sample live patch that replaces the procfs handler
for /proc/cmdline to print "this has been live patched".
config SAMPLE_CONFIGFS
tristate "Build configfs patching sample -- loadable modules only"
depends on CONFIGFS_FS && m
help
Builds a sample configfs interface.
endif # SAMPLES

3
samples/Makefile
View File

@ -1,4 +1,5 @@
# Makefile for Linux samples code
obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ trace_events/ livepatch/ \
hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/ seccomp/
hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/ seccomp/ \
configfs/

2
samples/configfs/Makefile Normal file
View File

@ -0,0 +1,2 @@
obj-$(CONFIG_SAMPLE_CONFIGFS) += configfs_sample.o

140
Documentation/filesystems/configfs/configfs_example_macros.c → samples/configfs/configfs_sample.c
View File

@ -54,18 +54,13 @@ struct childless {
static inline struct childless *to_childless(struct config_item *item)
{
return item ? container_of(to_configfs_subsystem(to_config_group(item)), struct childless, subsys) : NULL;
return item ? container_of(to_configfs_subsystem(to_config_group(item)),
struct childless, subsys) : NULL;
}
CONFIGFS_ATTR_STRUCT(childless);
#define CHILDLESS_ATTR(_name, _mode, _show, _store) \
struct childless_attribute childless_attr_##_name = __CONFIGFS_ATTR(_name, _mode, _show, _store)
#define CHILDLESS_ATTR_RO(_name, _show) \
struct childless_attribute childless_attr_##_name = __CONFIGFS_ATTR_RO(_name, _show);
static ssize_t childless_showme_read(struct childless *childless,
char *page)
static ssize_t childless_showme_show(struct config_item *item, char *page)
{
struct childless *childless = to_childless(item);
ssize_t pos;
pos = sprintf(page, "%d\n", childless->showme);
@ -74,16 +69,15 @@ static ssize_t childless_showme_read(struct childless *childless,
return pos;
}
static ssize_t childless_storeme_read(struct childless *childless,
char *page)
static ssize_t childless_storeme_show(struct config_item *item, char *page)
{
return sprintf(page, "%d\n", childless->storeme);
return sprintf(page, "%d\n", to_childless(item)->storeme);
}
static ssize_t childless_storeme_write(struct childless *childless,
const char *page,
size_t count)
static ssize_t childless_storeme_store(struct config_item *item,
const char *page, size_t count)
{
struct childless *childless = to_childless(item);
unsigned long tmp;
char *p = (char *) page;
@ -99,8 +93,7 @@ static ssize_t childless_storeme_write(struct childless *childless,
return count;
}
static ssize_t childless_description_read(struct childless *childless,
char *page)
static ssize_t childless_description_show(struct config_item *item, char *page)
{
return sprintf(page,
"[01-childless]\n"
@ -111,26 +104,18 @@ static ssize_t childless_description_read(struct childless *childless,
"than a directory in /proc.\n");
}
CHILDLESS_ATTR_RO(showme, childless_showme_read);
CHILDLESS_ATTR(storeme, S_IRUGO | S_IWUSR, childless_storeme_read,
childless_storeme_write);
CHILDLESS_ATTR_RO(description, childless_description_read);
CONFIGFS_ATTR_RO(childless_, showme);
CONFIGFS_ATTR(childless_, storeme);
CONFIGFS_ATTR_RO(childless_, description);
static struct configfs_attribute *childless_attrs[] = {
&childless_attr_showme.attr,
&childless_attr_storeme.attr,
&childless_attr_description.attr,
&childless_attr_showme,
&childless_attr_storeme,
&childless_attr_description,
NULL,
};
CONFIGFS_ATTR_OPS(childless);
static struct configfs_item_operations childless_item_ops = {
.show_attribute = childless_attr_show,
.store_attribute = childless_attr_store,
};
static struct config_item_type childless_type = {
.ct_item_ops = &childless_item_ops,
.ct_attrs = childless_attrs,
.ct_owner = THIS_MODULE,
};
@ -168,32 +153,13 @@ static inline struct simple_child *to_simple_child(struct config_item *item)
return item ? container_of(item, struct simple_child, item) : NULL;
}
static struct configfs_attribute simple_child_attr_storeme = {
.ca_owner = THIS_MODULE,
.ca_name = "storeme",
.ca_mode = S_IRUGO | S_IWUSR,
};
static struct configfs_attribute *simple_child_attrs[] = {
&simple_child_attr_storeme,
NULL,
};
static ssize_t simple_child_attr_show(struct config_item *item,
struct configfs_attribute *attr,
char *page)
static ssize_t simple_child_storeme_show(struct config_item *item, char *page)
{
ssize_t count;
struct simple_child *simple_child = to_simple_child(item);
count = sprintf(page, "%d\n", simple_child->storeme);
return count;
return sprintf(page, "%d\n", to_simple_child(item)->storeme);
}
static ssize_t simple_child_attr_store(struct config_item *item,
struct configfs_attribute *attr,
const char *page, size_t count)
static ssize_t simple_child_storeme_store(struct config_item *item,
const char *page, size_t count)
{
struct simple_child *simple_child = to_simple_child(item);
unsigned long tmp;
@ -211,6 +177,13 @@ static ssize_t simple_child_attr_store(struct config_item *item,
return count;
}
CONFIGFS_ATTR(simple_child_, storeme);
static struct configfs_attribute *simple_child_attrs[] = {
&simple_child_attr_storeme,
NULL,
};
static void simple_child_release(struct config_item *item)
{
kfree(to_simple_child(item));
@ -218,8 +191,6 @@ static void simple_child_release(struct config_item *item)
static struct configfs_item_operations simple_child_item_ops = {
.release = simple_child_release,
.show_attribute = simple_child_attr_show,
.store_attribute = simple_child_attr_store,
};
static struct config_item_type simple_child_type = {
@ -235,10 +206,12 @@ struct simple_children {
static inline struct simple_children *to_simple_children(struct config_item *item)
{
return item ? container_of(to_config_group(item), struct simple_children, group) : NULL;
return item ? container_of(to_config_group(item),
struct simple_children, group) : NULL;
}
static struct config_item *simple_children_make_item(struct config_group *group, const char *name)
static struct config_item *simple_children_make_item(struct config_group *group,
const char *name)
{
struct simple_child *simple_child;
@ -254,20 +227,8 @@ static struct config_item *simple_children_make_item(struct config_group *group,
return &simple_child->item;
}
static struct configfs_attribute simple_children_attr_description = {
.ca_owner = THIS_MODULE,
.ca_name = "description",
.ca_mode = S_IRUGO,
};
static struct configfs_attribute *simple_children_attrs[] = {
&simple_children_attr_description,
NULL,
};
static ssize_t simple_children_attr_show(struct config_item *item,
struct configfs_attribute *attr,
char *page)
static ssize_t simple_children_description_show(struct config_item *item,
char *page)
{
return sprintf(page,
"[02-simple-children]\n"
@ -276,6 +237,13 @@ static ssize_t simple_children_attr_show(struct config_item *item,
"items have only one attribute that is readable and writeable.\n");
}
CONFIGFS_ATTR_RO(simple_children_, description);
static struct configfs_attribute *simple_children_attrs[] = {
&simple_children_attr_description,
NULL,
};
static void simple_children_release(struct config_item *item)
{
kfree(to_simple_children(item));
@ -283,7 +251,6 @@ static void simple_children_release(struct config_item *item)
static struct configfs_item_operations simple_children_item_ops = {
.release = simple_children_release,
.show_attribute = simple_children_attr_show,
};
/*
@ -323,7 +290,8 @@ static struct configfs_subsystem simple_children_subsys = {
* children of its own.
*/
static struct config_group *group_children_make_group(struct config_group *group, const char *name)
static struct config_group *group_children_make_group(
struct config_group *group, const char *name)
{
struct simple_children *simple_children;
@ -338,20 +306,8 @@ static struct config_group *group_children_make_group(struct config_group *group
return &simple_children->group;
}
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,
struct configfs_attribute *attr,
char *page)
static ssize_t group_children_description_show(struct config_item *item,
char *page)
{
return sprintf(page,
"[03-group-children]\n"
@ -360,8 +316,11 @@ static ssize_t group_children_attr_show(struct config_item *item,
"groups are like the subsystem simple-children.\n");
}
static struct configfs_item_operations group_children_item_ops = {
.show_attribute = group_children_attr_show,
CONFIGFS_ATTR_RO(group_children_, description);
static struct configfs_attribute *group_children_attrs[] = {
&group_children_attr_description,
NULL,
};
/*
@ -373,7 +332,6 @@ static struct configfs_group_operations group_children_group_ops = {
};
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,
.ct_owner = THIS_MODULE,