linux/fs/configfs/item.c
Paul Bolle 395cf9691d doc: fix broken references
There are numerous broken references to Documentation files (in other
Documentation files, in comments, etc.). These broken references are
caused by typo's in the references, and by renames or removals of the
Documentation files. Some broken references are simply odd.

Fix these broken references, sometimes by dropping the irrelevant text
they were part of.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-09-27 18:08:04 +02:00

217 lines
5.4 KiB
C

/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* item.c - library routines for handling generic config items
*
* 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 kobject:
* kobject is Copyright (c) 2002-2003 Patrick Mochel
*
* configfs Copyright (C) 2005 Oracle. All rights reserved.
*
* Please see the file Documentation/filesystems/configfs/configfs.txt for
* critical information about using the config_item interface.
*/
#include <linux/string.h>
#include <linux/module.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/configfs.h>
static inline struct config_item * to_item(struct list_head * entry)
{
return container_of(entry,struct config_item,ci_entry);
}
/* Evil kernel */
static void config_item_release(struct kref *kref);
/**
* config_item_init - initialize item.
* @item: item in question.
*/
void config_item_init(struct config_item * item)
{
kref_init(&item->ci_kref);
INIT_LIST_HEAD(&item->ci_entry);
}
/**
* config_item_set_name - Set the name of an item
* @item: item.
* @name: name.
*
* If strlen(name) >= CONFIGFS_ITEM_NAME_LEN, then use a
* dynamically allocated string that @item->ci_name points to.
* Otherwise, use the static @item->ci_namebuf array.
*/
int config_item_set_name(struct config_item * item, const char * fmt, ...)
{
int error = 0;
int limit = CONFIGFS_ITEM_NAME_LEN;
int need;
va_list args;
char * name;
/*
* First, try the static array
*/
va_start(args,fmt);
need = vsnprintf(item->ci_namebuf,limit,fmt,args);
va_end(args);
if (need < limit)
name = item->ci_namebuf;
else {
/*
* Need more space? Allocate it and try again
*/
limit = need + 1;
name = kmalloc(limit,GFP_KERNEL);
if (!name) {
error = -ENOMEM;
goto Done;
}
va_start(args,fmt);
need = vsnprintf(name,limit,fmt,args);
va_end(args);
/* Still? Give up. */
if (need >= limit) {
kfree(name);
error = -EFAULT;
goto Done;
}
}
/* Free the old name, if necessary. */
if (item->ci_name && item->ci_name != item->ci_namebuf)
kfree(item->ci_name);
/* Now, set the new name */
item->ci_name = name;
Done:
return error;
}
EXPORT_SYMBOL(config_item_set_name);
void config_item_init_type_name(struct config_item *item,
const char *name,
struct config_item_type *type)
{
config_item_set_name(item, name);
item->ci_type = type;
config_item_init(item);
}
EXPORT_SYMBOL(config_item_init_type_name);
void config_group_init_type_name(struct config_group *group, const char *name,
struct config_item_type *type)
{
config_item_set_name(&group->cg_item, name);
group->cg_item.ci_type = type;
config_group_init(group);
}
EXPORT_SYMBOL(config_group_init_type_name);
struct config_item * config_item_get(struct config_item * item)
{
if (item)
kref_get(&item->ci_kref);
return item;
}
static void config_item_cleanup(struct config_item * item)
{
struct config_item_type * t = item->ci_type;
struct config_group * s = item->ci_group;
struct config_item * parent = item->ci_parent;
pr_debug("config_item %s: cleaning up\n",config_item_name(item));
if (item->ci_name != item->ci_namebuf)
kfree(item->ci_name);
item->ci_name = NULL;
if (t && t->ct_item_ops && t->ct_item_ops->release)
t->ct_item_ops->release(item);
if (s)
config_group_put(s);
if (parent)
config_item_put(parent);
}
static void config_item_release(struct kref *kref)
{
config_item_cleanup(container_of(kref, struct config_item, ci_kref));
}
/**
* config_item_put - decrement refcount for item.
* @item: item.
*
* Decrement the refcount, and if 0, call config_item_cleanup().
*/
void config_item_put(struct config_item * item)
{
if (item)
kref_put(&item->ci_kref, config_item_release);
}
/**
* config_group_init - initialize a group for use
* @k: group
*/
void config_group_init(struct config_group *group)
{
config_item_init(&group->cg_item);
INIT_LIST_HEAD(&group->cg_children);
}
/**
* config_group_find_item - search for item in group.
* @group: group we're looking in.
* @name: item's name.
*
* Iterate over @group->cg_list, looking for a matching config_item.
* If matching item is found take a reference and return the item.
* Caller must have locked group via @group->cg_subsys->su_mtx.
*/
struct config_item *config_group_find_item(struct config_group *group,
const char *name)
{
struct list_head * entry;
struct config_item * ret = NULL;
list_for_each(entry,&group->cg_children) {
struct config_item * item = to_item(entry);
if (config_item_name(item) &&
!strcmp(config_item_name(item), name)) {
ret = config_item_get(item);
break;
}
}
return ret;
}
EXPORT_SYMBOL(config_item_init);
EXPORT_SYMBOL(config_group_init);
EXPORT_SYMBOL(config_item_get);
EXPORT_SYMBOL(config_item_put);
EXPORT_SYMBOL(config_group_find_item);