* kobject.c - library routines for handling generic kernel objects
*
* Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
+ * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (c) 2006-2007 Novell Inc.
*
* This file is released under the GPLv2.
*
* Add 1 to strlen for leading '/' of each level.
*/
do {
+ if (kobject_name(parent) == NULL)
+ return 0;
length += strlen(kobject_name(parent)) + 1;
parent = parent->parent;
} while (parent);
}
/**
- * kobject_get_path - generate and return the path associated with a given kobj
- * and kset pair. The result must be freed by the caller with kfree().
+ * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
*
* @kobj: kobject in question, with which to build the path
* @gfp_mask: the allocation type used to allocate the path
+ *
+ * The result must be freed by the caller with kfree().
*/
char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
{
int len;
len = get_kobj_path_length(kobj);
- path = kmalloc(len, gfp_mask);
+ if (len == 0)
+ return NULL;
+ path = kzalloc(len, gfp_mask);
if (!path)
return NULL;
- memset(path, 0x00, len);
fill_kobj_path(kobj, path, len);
return path;
}
+EXPORT_SYMBOL_GPL(kobject_get_path);
/**
* kobject_init - initialize object.
*/
void kobject_init(struct kobject * kobj)
{
+ if (!kobj)
+ return;
kref_init(&kobj->kref);
INIT_LIST_HEAD(&kobj->entry);
kobj->kset = kset_get(kobj->kset);
if (!(kobj = kobject_get(kobj)))
return -ENOENT;
if (!kobj->k_name)
- kobj->k_name = kobj->name;
+ kobject_set_name(kobj, "NO_NAME");
+ if (!*kobj->k_name) {
+ pr_debug("kobject attempted to be registered with no name!\n");
+ WARN_ON(1);
+ kobject_put(kobj);
+ return -EINVAL;
+ }
parent = kobject_get(kobj->parent);
pr_debug("kobject %s: registering. parent: %s, set: %s\n",
kobject_name(kobj), parent ? kobject_name(parent) : "<NULL>",
- kobj->kset ? kobj->kset->kobj.name : "<NULL>" );
+ kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" );
if (kobj->kset) {
spin_lock(&kobj->kset->list_lock);
list_add_tail(&kobj->entry,&kobj->kset->list);
spin_unlock(&kobj->kset->list_lock);
+ kobj->parent = parent;
}
- kobj->parent = parent;
error = create_dir(kobj);
if (error) {
/* unlink does the kobject_put() for us */
unlink(kobj);
- if (parent)
- kobject_put(parent);
+ kobject_put(parent);
+
+ /* be noisy on error issues */
+ if (error == -EEXIST)
+ printk(KERN_ERR "kobject_add failed for %s with "
+ "-EEXIST, don't try to register things with "
+ "the same name in the same directory.\n",
+ kobject_name(kobj));
+ else
+ printk(KERN_ERR "kobject_add failed for %s (%d)\n",
+ kobject_name(kobj), error);
+ dump_stack();
}
return error;
}
-
/**
* kobject_register - initialize and add an object.
* @kobj: object in question.
int kobject_register(struct kobject * kobj)
{
- int error = 0;
+ int error = -EINVAL;
if (kobj) {
kobject_init(kobj);
error = kobject_add(kobj);
- if (error) {
- printk("kobject_register failed for %s (%d)\n",
- kobject_name(kobj),error);
- dump_stack();
- } else
- kobject_hotplug(kobj, KOBJ_ADD);
- } else
- error = -EINVAL;
+ if (!error)
+ kobject_uevent(kobj, KOBJ_ADD);
+ }
return error;
}
int kobject_set_name(struct kobject * kobj, const char * fmt, ...)
{
int error = 0;
- int limit = KOBJ_NAME_LEN;
+ int limit;
int need;
va_list args;
- char * name;
+ char *name;
- /*
- * First, try the static array
- */
- va_start(args,fmt);
- need = vsnprintf(kobj->name,limit,fmt,args);
+ /* find out how big a buffer we need */
+ name = kmalloc(1024, GFP_KERNEL);
+ if (!name) {
+ error = -ENOMEM;
+ goto done;
+ }
+ va_start(args, fmt);
+ need = vsnprintf(name, 1024, fmt, args);
va_end(args);
- if (need < limit)
- name = kobj->name;
- 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;
- }
+ kfree(name);
+
+ /* Allocate the new space and copy the string in */
+ 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);
+
+ /* something wrong with the string we copied? */
+ if (need >= limit) {
+ kfree(name);
+ error = -EFAULT;
+ goto done;
}
/* Free the old name, if necessary. */
- if (kobj->k_name && kobj->k_name != kobj->name)
- kfree(kobj->k_name);
+ kfree(kobj->k_name);
/* Now, set the new name */
kobj->k_name = name;
- Done:
+done:
return error;
}
-
EXPORT_SYMBOL(kobject_set_name);
-
/**
* kobject_rename - change the name of an object
* @kobj: object in question.
int kobject_rename(struct kobject * kobj, const char *new_name)
{
int error = 0;
+ const char *devpath = NULL;
+ char *devpath_string = NULL;
+ char *envp[2];
kobj = kobject_get(kobj);
if (!kobj)
return -EINVAL;
+ if (!kobj->parent)
+ return -EINVAL;
+
+ devpath = kobject_get_path(kobj, GFP_KERNEL);
+ if (!devpath) {
+ error = -ENOMEM;
+ goto out;
+ }
+ devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
+ if (!devpath_string) {
+ error = -ENOMEM;
+ goto out;
+ }
+ sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
+ envp[0] = devpath_string;
+ envp[1] = NULL;
+ /* Note : if we want to send the new name alone, not the full path,
+ * we could probably use kobject_name(kobj); */
+
error = sysfs_rename_dir(kobj, new_name);
+
+ /* This function is mostly/only used for network interface.
+ * Some hotplug package track interfaces by their name and
+ * therefore want to know when the name is changed by the user. */
+ if (!error)
+ kobject_uevent_env(kobj, KOBJ_MOVE, envp);
+
+out:
+ kfree(devpath_string);
+ kfree(devpath);
kobject_put(kobj);
return error;
}
/**
+ * kobject_move - move object to another parent
+ * @kobj: object in question.
+ * @new_parent: object's new parent (can be NULL)
+ */
+
+int kobject_move(struct kobject *kobj, struct kobject *new_parent)
+{
+ int error;
+ struct kobject *old_parent;
+ const char *devpath = NULL;
+ char *devpath_string = NULL;
+ char *envp[2];
+
+ kobj = kobject_get(kobj);
+ if (!kobj)
+ return -EINVAL;
+ new_parent = kobject_get(new_parent);
+ if (!new_parent) {
+ if (kobj->kset)
+ new_parent = kobject_get(&kobj->kset->kobj);
+ }
+ /* old object path */
+ devpath = kobject_get_path(kobj, GFP_KERNEL);
+ if (!devpath) {
+ error = -ENOMEM;
+ goto out;
+ }
+ devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
+ if (!devpath_string) {
+ error = -ENOMEM;
+ goto out;
+ }
+ sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
+ envp[0] = devpath_string;
+ envp[1] = NULL;
+ error = sysfs_move_dir(kobj, new_parent);
+ if (error)
+ goto out;
+ old_parent = kobj->parent;
+ kobj->parent = new_parent;
+ new_parent = NULL;
+ kobject_put(old_parent);
+ kobject_uevent_env(kobj, KOBJ_MOVE, envp);
+out:
+ kobject_put(new_parent);
+ kobject_put(kobj);
+ kfree(devpath_string);
+ kfree(devpath);
+ return error;
+}
+
+/**
* kobject_del - unlink kobject from hierarchy.
* @kobj: object.
*/
void kobject_del(struct kobject * kobj)
{
+ if (!kobj)
+ return;
sysfs_remove_dir(kobj);
unlink(kobj);
}
void kobject_unregister(struct kobject * kobj)
{
+ if (!kobj)
+ return;
pr_debug("kobject %s: unregistering\n",kobject_name(kobj));
- kobject_hotplug(kobj, KOBJ_REMOVE);
+ kobject_uevent(kobj, KOBJ_REMOVE);
kobject_del(kobj);
kobject_put(kobj);
}
struct kobj_type * t = get_ktype(kobj);
struct kset * s = kobj->kset;
struct kobject * parent = kobj->parent;
+ const char *name = kobj->k_name;
pr_debug("kobject %s: cleaning up\n",kobject_name(kobj));
- if (kobj->k_name != kobj->name)
- kfree(kobj->k_name);
- kobj->k_name = NULL;
- if (t && t->release)
+ if (t && t->release) {
t->release(kobj);
+ /* If we have a release function, we can guess that this was
+ * not a statically allocated kobject, so we should be safe to
+ * free the name */
+ kfree(name);
+ }
if (s)
kset_put(s);
- if (parent)
- kobject_put(parent);
+ kobject_put(parent);
}
static void kobject_release(struct kref *kref)
}
+static void dir_release(struct kobject *kobj)
+{
+ kfree(kobj);
+}
+
+static struct kobj_type dir_ktype = {
+ .release = dir_release,
+ .sysfs_ops = NULL,
+ .default_attrs = NULL,
+};
+
+/**
+ * kobject_kset_add_dir - add sub directory of object.
+ * @kset: kset the directory is belongs to.
+ * @parent: object in which a directory is created.
+ * @name: directory name.
+ *
+ * Add a plain directory object as child of given object.
+ */
+struct kobject *kobject_kset_add_dir(struct kset *kset,
+ struct kobject *parent, const char *name)
+{
+ struct kobject *k;
+ int ret;
+
+ if (!parent)
+ return NULL;
+
+ k = kzalloc(sizeof(*k), GFP_KERNEL);
+ if (!k)
+ return NULL;
+
+ k->kset = kset;
+ k->parent = parent;
+ k->ktype = &dir_ktype;
+ kobject_set_name(k, name);
+ ret = kobject_register(k);
+ if (ret < 0) {
+ printk(KERN_WARNING "%s: kobject_register error: %d\n",
+ __func__, ret);
+ kobject_del(k);
+ return NULL;
+ }
+
+ return k;
+}
+
+/**
+ * kobject_add_dir - add sub directory of object.
+ * @parent: object in which a directory is created.
+ * @name: directory name.
+ *
+ * Add a plain directory object as child of given object.
+ */
+struct kobject *kobject_add_dir(struct kobject *parent, const char *name)
+{
+ return kobject_kset_add_dir(NULL, parent, name);
+}
+
/**
* kset_init - initialize a kset for use
* @k: kset
/**
* kset_add - add a kset object to the hierarchy.
* @k: kset.
- *
- * Simply, this adds the kset's embedded kobject to the
- * hierarchy.
- * We also try to make sure that the kset's embedded kobject
- * has a parent before it is added. We only care if the embedded
- * kobject is not part of a kset itself, since kobject_add()
- * assigns a parent in that case.
- * If that is the case, and the kset has a controlling subsystem,
- * then we set the kset's parent to be said subsystem.
*/
int kset_add(struct kset * k)
{
- if (!k->kobj.parent && !k->kobj.kset && k->subsys)
- k->kobj.parent = &k->subsys->kset.kobj;
-
return kobject_add(&k->kobj);
}
int kset_register(struct kset * k)
{
+ int err;
+
+ if (!k)
+ return -EINVAL;
+
kset_init(k);
- return kset_add(k);
+ err = kset_add(k);
+ if (err)
+ return err;
+ kobject_uevent(&k->kobj, KOBJ_ADD);
+ return 0;
}
void kset_unregister(struct kset * k)
{
+ if (!k)
+ return;
kobject_unregister(&k->kobj);
}
return ret;
}
-
-void subsystem_init(struct subsystem * s)
+int subsystem_register(struct kset *s)
{
- init_rwsem(&s->rwsem);
- kset_init(&s->kset);
-}
-
-/**
- * subsystem_register - register a subsystem.
- * @s: the subsystem we're registering.
- *
- * Once we register the subsystem, we want to make sure that
- * the kset points back to this subsystem for correct usage of
- * the rwsem.
- */
-
-int subsystem_register(struct subsystem * s)
-{
- int error;
-
- subsystem_init(s);
- pr_debug("subsystem %s: registering\n",s->kset.kobj.name);
-
- if (!(error = kset_add(&s->kset))) {
- if (!s->kset.subsys)
- s->kset.subsys = s;
- }
- return error;
+ return kset_register(s);
}
-void subsystem_unregister(struct subsystem * s)
+void subsystem_unregister(struct kset *s)
{
- pr_debug("subsystem %s: unregistering\n",s->kset.kobj.name);
- kset_unregister(&s->kset);
+ kset_unregister(s);
}
-
/**
* subsystem_create_file - export sysfs attribute file.
* @s: subsystem.
* @a: subsystem attribute descriptor.
*/
-int subsys_create_file(struct subsystem * s, struct subsys_attribute * a)
+int subsys_create_file(struct kset *s, struct subsys_attribute *a)
{
int error = 0;
- if (subsys_get(s)) {
- error = sysfs_create_file(&s->kset.kobj,&a->attr);
- subsys_put(s);
- }
- return error;
-}
-
-/**
- * subsystem_remove_file - remove sysfs attribute file.
- * @s: subsystem.
- * @a: attribute desciptor.
- */
+ if (!s || !a)
+ return -EINVAL;
-void subsys_remove_file(struct subsystem * s, struct subsys_attribute * a)
-{
- if (subsys_get(s)) {
- sysfs_remove_file(&s->kset.kobj,&a->attr);
- subsys_put(s);
+ if (kset_get(s)) {
+ error = sysfs_create_file(&s->kobj, &a->attr);
+ kset_put(s);
}
+ return error;
}
EXPORT_SYMBOL(kobject_init);
EXPORT_SYMBOL(kset_register);
EXPORT_SYMBOL(kset_unregister);
-EXPORT_SYMBOL(kset_find_obj);
-EXPORT_SYMBOL(subsystem_init);
EXPORT_SYMBOL(subsystem_register);
EXPORT_SYMBOL(subsystem_unregister);
EXPORT_SYMBOL(subsys_create_file);
-EXPORT_SYMBOL(subsys_remove_file);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff