#include <linux/stat.h>
#include <linux/slab.h>
-/**
- * populate_dir - populate directory with attributes.
- * @kobj: object we're working on.
- *
- * Most subsystems have a set of default attributes that
- * are associated with an object that registers with them.
- * This is a helper called during object registration that
- * loops through the default attributes of the subsystem
- * and creates attributes files for them in sysfs.
+/*
+ * populate_dir - populate directory with attributes.
+ * @kobj: object we're working on.
*
+ * Most subsystems have a set of default attributes that are associated
+ * with an object that registers with them. This is a helper called during
+ * object registration that loops through the default attributes of the
+ * subsystem and creates attributes files for them in sysfs.
*/
-
-static int populate_dir(struct kobject * kobj)
+static int populate_dir(struct kobject *kobj)
{
- struct kobj_type * t = get_ktype(kobj);
- struct attribute * attr;
+ struct kobj_type *t = get_ktype(kobj);
+ struct attribute *attr;
int error = 0;
int i;
-
+
if (t && t->default_attrs) {
for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
- if ((error = sysfs_create_file(kobj,attr)))
+ error = sysfs_create_file(kobj, attr);
+ if (error)
break;
}
}
return error;
}
-static int create_dir(struct kobject * kobj)
+static int create_dir(struct kobject *kobj)
{
int error = 0;
if (kobject_name(kobj)) {
error = sysfs_create_dir(kobj);
if (!error) {
- if ((error = populate_dir(kobj)))
+ error = populate_dir(kobj);
+ if (error)
sysfs_remove_dir(kobj);
}
}
return error;
}
-static inline struct kobject * to_kobj(struct list_head * entry)
-{
- return container_of(entry,struct kobject,entry);
-}
-
static int get_kobj_path_length(struct kobject *kobj)
{
int length = 1;
- struct kobject * parent = kobj;
+ struct kobject *parent = kobj;
- /* walk up the ancestors until we hit the one pointing to the
+ /* walk up the ancestors until we hit the one pointing to the
* root.
* Add 1 to strlen for leading '/' of each level.
*/
static void fill_kobj_path(struct kobject *kobj, char *path, int length)
{
- struct kobject * parent;
+ struct kobject *parent;
--length;
for (parent = kobj; parent; parent = parent->parent) {
int cur = strlen(kobject_name(parent));
/* back up enough to print this name with '/' */
length -= cur;
- strncpy (path + length, kobject_name(parent), cur);
+ strncpy(path + length, kobject_name(parent), cur);
*(path + --length) = '/';
}
pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
- kobj, __FUNCTION__,path);
+ kobj, __func__, path);
}
/**
}
EXPORT_SYMBOL_GPL(kobject_get_path);
-/**
- * kobject_init - initialize object.
- * @kobj: object in question.
- */
-void kobject_init(struct kobject * kobj)
+/* add the kobject to its kset's list */
+static void kobj_kset_join(struct kobject *kobj)
{
- if (!kobj)
+ if (!kobj->kset)
return;
- kref_init(&kobj->kref);
- INIT_LIST_HEAD(&kobj->entry);
+
+ kset_get(kobj->kset);
+ spin_lock(&kobj->kset->list_lock);
+ list_add_tail(&kobj->entry, &kobj->kset->list);
+ spin_unlock(&kobj->kset->list_lock);
}
+/* remove the kobject from its kset's list */
+static void kobj_kset_leave(struct kobject *kobj)
+{
+ if (!kobj->kset)
+ return;
-/**
- * unlink - remove kobject from kset list.
- * @kobj: kobject.
- *
- * Remove the kobject from the kset list and decrement
- * its parent's refcount.
- * This is separated out, so we can use it in both
- * kobject_del() and kobject_add() on error.
- */
+ spin_lock(&kobj->kset->list_lock);
+ list_del_init(&kobj->entry);
+ spin_unlock(&kobj->kset->list_lock);
+ kset_put(kobj->kset);
+}
-static void unlink(struct kobject * kobj)
+static void kobject_init_internal(struct kobject *kobj)
{
- if (kobj->kset) {
- spin_lock(&kobj->kset->list_lock);
- list_del_init(&kobj->entry);
- spin_unlock(&kobj->kset->list_lock);
- }
- kobject_put(kobj);
+ if (!kobj)
+ return;
+ kref_init(&kobj->kref);
+ INIT_LIST_HEAD(&kobj->entry);
+ kobj->state_in_sysfs = 0;
+ kobj->state_add_uevent_sent = 0;
+ kobj->state_remove_uevent_sent = 0;
+ kobj->state_initialized = 1;
}
-/**
- * kobject_add - add an object to the hierarchy.
- * @kobj: object.
- */
-int kobject_add(struct kobject * kobj)
+static int kobject_add_internal(struct kobject *kobj)
{
int error = 0;
- struct kobject * parent;
+ struct kobject *parent;
- if (!(kobj = kobject_get(kobj)))
+ if (!kobj)
return -ENOENT;
- if (!kobj->k_name)
- kobject_set_name(kobj, "NO_NAME");
- if (!*kobj->k_name) {
- pr_debug("kobject (%p) attempted to be registered with no "
+
+ if (!kobj->name || !kobj->name[0]) {
+ WARN(1, "kobject: (%p): attempted to be registered with empty "
"name!\n", kobj);
- WARN_ON(1);
- kobject_put(kobj);
return -EINVAL;
}
- parent = kobject_get(kobj->parent);
- pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
- kobject_name(kobj), kobj, __FUNCTION__,
- parent ? kobject_name(parent) : "<NULL>",
- kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" );
+ parent = kobject_get(kobj->parent);
+ /* join kset if set, use it as parent if we do not already have one */
if (kobj->kset) {
- kobj->kset = kset_get(kobj->kset);
-
- if (!parent) {
+ if (!parent)
parent = kobject_get(&kobj->kset->kobj);
- /*
- * If the kset is our parent, get a second
- * reference, we drop both the kset and the
- * parent ref on cleanup
- */
- kobject_get(parent);
- }
-
- spin_lock(&kobj->kset->list_lock);
- list_add_tail(&kobj->entry, &kobj->kset->list);
- spin_unlock(&kobj->kset->list_lock);
+ kobj_kset_join(kobj);
kobj->parent = parent;
}
+ pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
+ kobject_name(kobj), kobj, __func__,
+ parent ? kobject_name(parent) : "<NULL>",
+ kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
+
error = create_dir(kobj);
if (error) {
- /* unlink does the kobject_put() for us */
- unlink(kobj);
+ kobj_kset_leave(kobj);
kobject_put(parent);
+ kobj->parent = NULL;
/* be noisy on error issues */
if (error == -EEXIST)
- printk(KERN_ERR "kobject_add failed for %s with "
+ printk(KERN_ERR "%s failed for %s with "
"-EEXIST, don't try to register things with "
"the same name in the same directory.\n",
- kobject_name(kobj));
+ __func__, kobject_name(kobj));
else
- printk(KERN_ERR "kobject_add failed for %s (%d)\n",
- kobject_name(kobj), error);
+ printk(KERN_ERR "%s failed for %s (%d)\n",
+ __func__, kobject_name(kobj), error);
dump_stack();
- }
-
- return error;
-}
+ } else
+ kobj->state_in_sysfs = 1;
-/**
- * kobject_register - initialize and add an object.
- * @kobj: object in question.
- */
-
-int kobject_register(struct kobject * kobj)
-{
- int error = -EINVAL;
- if (kobj) {
- kobject_init(kobj);
- error = kobject_add(kobj);
- if (!error)
- kobject_uevent(kobj, KOBJ_ADD);
- }
return error;
}
* @fmt: format string used to build the name
* @vargs: vargs to format the string.
*/
-static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
+int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
va_list vargs)
{
- va_list aq;
- char *name;
+ const char *old_name = kobj->name;
+ char *s;
- va_copy(aq, vargs);
- name = kvasprintf(GFP_KERNEL, fmt, vargs);
- va_end(aq);
+ if (kobj->name && !fmt)
+ return 0;
- if (!name)
+ kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
+ if (!kobj->name)
return -ENOMEM;
- /* Free the old name, if necessary. */
- kfree(kobj->k_name);
-
- /* Now, set the new name */
- kobj->k_name = name;
+ /* ewww... some of these buggers have '/' in the name ... */
+ while ((s = strchr(kobj->name, '/')))
+ s[0] = '!';
+ kfree(old_name);
return 0;
}
*/
int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
{
- va_list args;
+ va_list vargs;
int retval;
- va_start(args, fmt);
- retval = kobject_set_name_vargs(kobj, fmt, args);
- va_end(args);
+ va_start(vargs, fmt);
+ retval = kobject_set_name_vargs(kobj, fmt, vargs);
+ va_end(vargs);
return retval;
}
EXPORT_SYMBOL(kobject_set_name);
/**
- * kobject_init_ng - initialize a kobject structure
+ * kobject_init - initialize a kobject structure
* @kobj: pointer to the kobject to initialize
* @ktype: pointer to the ktype for this kobject.
*
* to kobject_put(), not by a call to kfree directly to ensure that all of
* the memory is cleaned up properly.
*/
-void kobject_init_ng(struct kobject *kobj, struct kobj_type *ktype)
+void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
{
char *err_str;
err_str = "must have a ktype to be initialized properly!\n";
goto error;
}
- if (atomic_read(&kobj->kref.refcount)) {
+ if (kobj->state_initialized) {
/* do not error out as sometimes we can recover */
- printk(KERN_ERR "kobject: reference count is already set, "
- "something is seriously wrong.\n");
+ printk(KERN_ERR "kobject (%p): tried to init an initialized "
+ "object, something is seriously wrong.\n", kobj);
dump_stack();
}
- kref_init(&kobj->kref);
- INIT_LIST_HEAD(&kobj->entry);
+ kobject_init_internal(kobj);
kobj->ktype = ktype;
return;
error:
- printk(KERN_ERR "kobject: %s\n", err_str);
+ printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
dump_stack();
}
-EXPORT_SYMBOL(kobject_init_ng);
+EXPORT_SYMBOL(kobject_init);
static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
const char *fmt, va_list vargs)
{
- va_list aq;
int retval;
- va_copy(aq, vargs);
- retval = kobject_set_name_vargs(kobj, fmt, aq);
- va_end(aq);
+ retval = kobject_set_name_vargs(kobj, fmt, vargs);
if (retval) {
printk(KERN_ERR "kobject: can not set name properly!\n");
return retval;
}
kobj->parent = parent;
- return kobject_add(kobj);
+ return kobject_add_internal(kobj);
}
/**
- * kobject_add_ng - the main kobject add function
+ * kobject_add - the main kobject add function
* @kobj: the kobject to add
* @parent: pointer to the parent of the kobject.
* @fmt: format to name the kobject with.
*
* If this function returns an error, kobject_put() must be called to
* properly clean up the memory associated with the object.
- *
- * If the function is successful, the only way to properly clean up the
- * memory is with a call to kobject_del(), in which case, a call to
- * kobject_put() is not necessary (kobject_del() does the final
- * kobject_put() to call the release function in the ktype's release
- * pointer.)
- *
* Under no instance should the kobject that is passed to this function
* be directly freed with a call to kfree(), that can leak memory.
*
- * Note, no uevent will be created with this call, the caller should set
+ * Note, no "add" uevent will be created with this call, the caller should set
* up all of the necessary sysfs files for the object and then call
* kobject_uevent() with the UEVENT_ADD parameter to ensure that
* userspace is properly notified of this kobject's creation.
*/
-int kobject_add_ng(struct kobject *kobj, struct kobject *parent,
- const char *fmt, ...)
+int kobject_add(struct kobject *kobj, struct kobject *parent,
+ const char *fmt, ...)
{
va_list args;
int retval;
if (!kobj)
return -EINVAL;
+ if (!kobj->state_initialized) {
+ printk(KERN_ERR "kobject '%s' (%p): tried to add an "
+ "uninitialized object, something is seriously wrong.\n",
+ kobject_name(kobj), kobj);
+ dump_stack();
+ return -EINVAL;
+ }
va_start(args, fmt);
retval = kobject_add_varg(kobj, parent, fmt, args);
va_end(args);
return retval;
}
-EXPORT_SYMBOL(kobject_add_ng);
+EXPORT_SYMBOL(kobject_add);
/**
* kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
* @parent: pointer to the parent of this kobject.
* @fmt: the name of the kobject.
*
- * This function combines the call to kobject_init_ng() and
- * kobject_add_ng(). The same type of error handling after a call to
- * kobject_add_ng() and kobject lifetime rules are the same here.
+ * This function combines the call to kobject_init() and
+ * kobject_add(). The same type of error handling after a call to
+ * kobject_add() and kobject lifetime rules are the same here.
*/
int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
struct kobject *parent, const char *fmt, ...)
va_list args;
int retval;
- kobject_init_ng(kobj, ktype);
+ kobject_init(kobj, ktype);
va_start(args, fmt);
retval = kobject_add_varg(kobj, parent, fmt, args);
EXPORT_SYMBOL_GPL(kobject_init_and_add);
/**
- * kobject_rename - change the name of an object
- * @kobj: object in question.
- * @new_name: object's new name
+ * kobject_rename - change the name of an object
+ * @kobj: object in question.
+ * @new_name: object's new name
+ *
+ * It is the responsibility of the caller to provide mutual
+ * exclusion between two different calls of kobject_rename
+ * on the same kobject and to ensure that new_name is valid and
+ * won't conflict with other kobjects.
*/
-
-int kobject_rename(struct kobject * kobj, const char *new_name)
+int kobject_rename(struct kobject *kobj, const char *new_name)
{
int error = 0;
const char *devpath = NULL;
+ const char *dup_name = NULL, *name;
char *devpath_string = NULL;
char *envp[2];
if (!kobj->parent)
return -EINVAL;
- /* see if this name is already in use */
- if (kobj->kset) {
- struct kobject *temp_kobj;
- temp_kobj = kset_find_obj(kobj->kset, new_name);
- if (temp_kobj) {
- printk(KERN_WARNING "kobject '%s' cannot be renamed "
- "to '%s' as '%s' is already in existence.\n",
- kobject_name(kobj), new_name, new_name);
- kobject_put(temp_kobj);
- return -EINVAL;
- }
- }
-
devpath = kobject_get_path(kobj, GFP_KERNEL);
if (!devpath) {
error = -ENOMEM;
envp[0] = devpath_string;
envp[1] = NULL;
+ name = dup_name = kstrdup(new_name, GFP_KERNEL);
+ if (!name) {
+ error = -ENOMEM;
+ goto out;
+ }
+
error = sysfs_rename_dir(kobj, new_name);
+ if (error)
+ goto out;
+
+ /* Install the new kobject name */
+ dup_name = kobj->name;
+ kobj->name = 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);
+ kobject_uevent_env(kobj, KOBJ_MOVE, envp);
out:
+ kfree(dup_name);
kfree(devpath_string);
kfree(devpath);
kobject_put(kobj);
return error;
}
+EXPORT_SYMBOL_GPL(kobject_rename);
/**
- * kobject_move - move object to another parent
- * @kobj: object in question.
- * @new_parent: object's new parent (can be NULL)
+ * 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;
}
/**
- * kobject_del - unlink kobject from hierarchy.
- * @kobj: object.
+ * kobject_del - unlink kobject from hierarchy.
+ * @kobj: object.
*/
-
-void kobject_del(struct kobject * kobj)
+void kobject_del(struct kobject *kobj)
{
if (!kobj)
return;
- sysfs_remove_dir(kobj);
- unlink(kobj);
-}
-
-/**
- * kobject_unregister - remove object from hierarchy and decrement refcount.
- * @kobj: object going away.
- */
-void kobject_unregister(struct kobject * kobj)
-{
- if (!kobj)
- return;
- pr_debug("kobject: '%s' (%p): %s\n",
- kobject_name(kobj), kobj, __FUNCTION__);
- kobject_uevent(kobj, KOBJ_REMOVE);
- kobject_del(kobj);
- kobject_put(kobj);
+ sysfs_remove_dir(kobj);
+ kobj->state_in_sysfs = 0;
+ kobj_kset_leave(kobj);
+ kobject_put(kobj->parent);
+ kobj->parent = NULL;
}
/**
- * kobject_get - increment refcount for object.
- * @kobj: object.
+ * kobject_get - increment refcount for object.
+ * @kobj: object.
*/
-
-struct kobject * kobject_get(struct kobject * kobj)
+struct kobject *kobject_get(struct kobject *kobj)
{
if (kobj)
kref_get(&kobj->kref);
*/
static void kobject_cleanup(struct kobject *kobj)
{
- struct kobj_type * t = get_ktype(kobj);
- struct kset * s = kobj->kset;
- struct kobject * parent = kobj->parent;
- const char *name = kobj->k_name;
+ struct kobj_type *t = get_ktype(kobj);
+ const char *name = kobj->name;
pr_debug("kobject: '%s' (%p): %s\n",
- kobject_name(kobj), kobj, __FUNCTION__);
+ kobject_name(kobj), kobj, __func__);
+
+ if (t && !t->release)
+ pr_debug("kobject: '%s' (%p): does not have a release() "
+ "function, it is broken and must be fixed.\n",
+ kobject_name(kobj), kobj);
+
+ /* send "remove" if the caller did not do it but sent "add" */
+ if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
+ pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
+ kobject_name(kobj), kobj);
+ kobject_uevent(kobj, KOBJ_REMOVE);
+ }
+
+ /* remove from sysfs if the caller did not do it */
+ if (kobj->state_in_sysfs) {
+ pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
+ kobject_name(kobj), kobj);
+ kobject_del(kobj);
+ }
+
if (t && t->release) {
+ pr_debug("kobject: '%s' (%p): calling ktype release\n",
+ kobject_name(kobj), kobj);
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 */
+ }
+
+ /* free name if we allocated it */
+ if (name) {
+ pr_debug("kobject: '%s': free name\n", name);
kfree(name);
}
- if (s)
- kset_put(s);
- kobject_put(parent);
}
static void kobject_release(struct kref *kref)
}
/**
- * kobject_put - decrement refcount for object.
- * @kobj: object.
+ * kobject_put - decrement refcount for object.
+ * @kobj: object.
*
- * Decrement the refcount, and if 0, call kobject_cleanup().
+ * Decrement the refcount, and if 0, call kobject_cleanup().
*/
-void kobject_put(struct kobject * kobj)
+void kobject_put(struct kobject *kobj)
{
- if (kobj)
+ if (kobj) {
+ if (!kobj->state_initialized)
+ WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
+ "initialized, yet kobject_put() is being "
+ "called.\n", kobject_name(kobj), kobj);
kref_put(&kobj->kref, kobject_release);
+ }
}
static void dynamic_kobj_release(struct kobject *kobj)
{
- pr_debug("kobject: '%s' (%p): %s\n",
- kobject_name(kobj), kobj, __FUNCTION__);
+ pr_debug("kobject: (%p): %s\n", kobj, __func__);
kfree(kobj);
}
*
* If the kobject was not able to be created, NULL will be returned.
* The kobject structure returned from here must be cleaned up with a
- * call to kobject_put() and not kfree(), as kobject_init_ng() has
+ * call to kobject_put() and not kfree(), as kobject_init() has
* already been called on this structure.
*/
struct kobject *kobject_create(void)
if (!kobj)
return NULL;
- kobject_init_ng(kobj, &dynamic_kobj_ktype);
+ kobject_init(kobj, &dynamic_kobj_ktype);
return kobj;
}
* @name: the name for the kset
* @parent: the parent kobject of this kobject, if any.
*
- * This function creates a kset structure dynamically and registers it
+ * This function creates a kobject structure dynamically and registers it
* with sysfs. When you are finished with this structure, call
- * kobject_unregister() and the structure will be dynamically freed when
+ * kobject_put() and the structure will be dynamically freed when
* it is no longer being used.
*
* If the kobject was not able to be created, NULL will be returned.
if (!kobj)
return NULL;
- retval = kobject_add_ng(kobj, parent, "%s", name);
+ retval = kobject_add(kobj, parent, "%s", name);
if (retval) {
printk(KERN_WARNING "%s: kobject_add error: %d\n",
- __FUNCTION__, retval);
+ __func__, retval);
kobject_put(kobj);
kobj = NULL;
}
EXPORT_SYMBOL_GPL(kobject_create_and_add);
/**
- * kset_init - initialize a kset for use
- * @k: kset
+ * kset_init - initialize a kset for use
+ * @k: kset
*/
-
-void kset_init(struct kset * k)
+void kset_init(struct kset *k)
{
- kobject_init(&k->kobj);
+ kobject_init_internal(&k->kobj);
INIT_LIST_HEAD(&k->list);
spin_lock_init(&k->list_lock);
}
return ret;
}
-struct sysfs_ops kobj_sysfs_ops = {
+const struct sysfs_ops kobj_sysfs_ops = {
.show = kobj_attr_show,
.store = kobj_attr_store,
};
/**
- * kset_add - add a kset object to the hierarchy.
- * @k: kset.
+ * kset_register - initialize and add a kset.
+ * @k: kset.
*/
-
-int kset_add(struct kset * k)
-{
- return kobject_add(&k->kobj);
-}
-
-
-/**
- * kset_register - initialize and add a kset.
- * @k: kset.
- */
-
-int kset_register(struct kset * k)
+int kset_register(struct kset *k)
{
int err;
return -EINVAL;
kset_init(k);
- err = kset_add(k);
+ err = kobject_add_internal(&k->kobj);
if (err)
return err;
kobject_uevent(&k->kobj, KOBJ_ADD);
return 0;
}
-
/**
- * kset_unregister - remove a kset.
- * @k: kset.
+ * kset_unregister - remove a kset.
+ * @k: kset.
*/
-
-void kset_unregister(struct kset * k)
+void kset_unregister(struct kset *k)
{
if (!k)
return;
- kobject_unregister(&k->kobj);
+ kobject_put(&k->kobj);
}
-
/**
- * kset_find_obj - search for object in kset.
- * @kset: kset we're looking in.
- * @name: object's name.
+ * kset_find_obj - search for object in kset.
+ * @kset: kset we're looking in.
+ * @name: object's name.
*
- * Lock kset via @kset->subsys, and iterate over @kset->list,
- * looking for a matching kobject. If matching object is found
- * take a reference and return the object.
+ * Lock kset via @kset->subsys, and iterate over @kset->list,
+ * looking for a matching kobject. If matching object is found
+ * take a reference and return the object.
*/
+struct kobject *kset_find_obj(struct kset *kset, const char *name)
+{
+ return kset_find_obj_hinted(kset, name, NULL);
+}
-struct kobject * kset_find_obj(struct kset * kset, const char * name)
+/**
+ * kset_find_obj_hinted - search for object in kset given a predecessor hint.
+ * @kset: kset we're looking in.
+ * @name: object's name.
+ * @hint: hint to possible object's predecessor.
+ *
+ * Check the hint's next object and if it is a match return it directly,
+ * otherwise, fall back to the behavior of kset_find_obj(). Either way
+ * a reference for the returned object is held and the reference on the
+ * hinted object is released.
+ */
+struct kobject *kset_find_obj_hinted(struct kset *kset, const char *name,
+ struct kobject *hint)
{
- struct list_head * entry;
- struct kobject * ret = NULL;
+ struct kobject *k;
+ struct kobject *ret = NULL;
spin_lock(&kset->list_lock);
- list_for_each(entry,&kset->list) {
- struct kobject * k = to_kobj(entry);
- if (kobject_name(k) && !strcmp(kobject_name(k),name)) {
+
+ if (!hint)
+ goto slow_search;
+
+ /* end of list detection */
+ if (hint->entry.next == kset->list.next)
+ goto slow_search;
+
+ k = container_of(hint->entry.next, struct kobject, entry);
+ if (!kobject_name(k) || strcmp(kobject_name(k), name))
+ goto slow_search;
+
+ ret = kobject_get(k);
+ goto unlock_exit;
+
+slow_search:
+ list_for_each_entry(k, &kset->list, entry) {
+ if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
ret = kobject_get(k);
break;
}
}
+
+unlock_exit:
spin_unlock(&kset->list_lock);
+
+ if (hint)
+ kobject_put(hint);
+
return ret;
}
{
struct kset *kset = container_of(kobj, struct kset, kobj);
pr_debug("kobject: '%s' (%p): %s\n",
- kobject_name(kobj), kobj, __FUNCTION__);
+ kobject_name(kobj), kobj, __func__);
kfree(kset);
}
* If the kset was not able to be created, NULL will be returned.
*/
static struct kset *kset_create(const char *name,
- struct kset_uevent_ops *uevent_ops,
+ const struct kset_uevent_ops *uevent_ops,
struct kobject *parent_kobj)
{
struct kset *kset;
+ int retval;
kset = kzalloc(sizeof(*kset), GFP_KERNEL);
if (!kset)
return NULL;
- kobject_set_name(&kset->kobj, name);
+ retval = kobject_set_name(&kset->kobj, name);
+ if (retval) {
+ kfree(kset);
+ return NULL;
+ }
kset->uevent_ops = uevent_ops;
kset->kobj.parent = parent_kobj;
* If the kset was not able to be created, NULL will be returned.
*/
struct kset *kset_create_and_add(const char *name,
- struct kset_uevent_ops *uevent_ops,
+ const struct kset_uevent_ops *uevent_ops,
struct kobject *parent_kobj)
{
struct kset *kset;
}
EXPORT_SYMBOL_GPL(kset_create_and_add);
-EXPORT_SYMBOL(kobject_init);
-EXPORT_SYMBOL(kobject_register);
-EXPORT_SYMBOL(kobject_unregister);
+
+static DEFINE_SPINLOCK(kobj_ns_type_lock);
+static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
+
+int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
+{
+ enum kobj_ns_type type = ops->type;
+ int error;
+
+ spin_lock(&kobj_ns_type_lock);
+
+ error = -EINVAL;
+ if (type >= KOBJ_NS_TYPES)
+ goto out;
+
+ error = -EINVAL;
+ if (type <= KOBJ_NS_TYPE_NONE)
+ goto out;
+
+ error = -EBUSY;
+ if (kobj_ns_ops_tbl[type])
+ goto out;
+
+ error = 0;
+ kobj_ns_ops_tbl[type] = ops;
+
+out:
+ spin_unlock(&kobj_ns_type_lock);
+ return error;
+}
+
+int kobj_ns_type_registered(enum kobj_ns_type type)
+{
+ int registered = 0;
+
+ spin_lock(&kobj_ns_type_lock);
+ if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
+ registered = kobj_ns_ops_tbl[type] != NULL;
+ spin_unlock(&kobj_ns_type_lock);
+
+ return registered;
+}
+
+const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
+{
+ const struct kobj_ns_type_operations *ops = NULL;
+
+ if (parent && parent->ktype->child_ns_type)
+ ops = parent->ktype->child_ns_type(parent);
+
+ return ops;
+}
+
+const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
+{
+ return kobj_child_ns_ops(kobj->parent);
+}
+
+
+void *kobj_ns_grab_current(enum kobj_ns_type type)
+{
+ void *ns = NULL;
+
+ spin_lock(&kobj_ns_type_lock);
+ if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+ kobj_ns_ops_tbl[type])
+ ns = kobj_ns_ops_tbl[type]->grab_current_ns();
+ spin_unlock(&kobj_ns_type_lock);
+
+ return ns;
+}
+
+const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
+{
+ const void *ns = NULL;
+
+ spin_lock(&kobj_ns_type_lock);
+ if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+ kobj_ns_ops_tbl[type])
+ ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
+ spin_unlock(&kobj_ns_type_lock);
+
+ return ns;
+}
+
+const void *kobj_ns_initial(enum kobj_ns_type type)
+{
+ const void *ns = NULL;
+
+ spin_lock(&kobj_ns_type_lock);
+ if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+ kobj_ns_ops_tbl[type])
+ ns = kobj_ns_ops_tbl[type]->initial_ns();
+ spin_unlock(&kobj_ns_type_lock);
+
+ return ns;
+}
+
+void kobj_ns_drop(enum kobj_ns_type type, void *ns)
+{
+ spin_lock(&kobj_ns_type_lock);
+ if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+ kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
+ kobj_ns_ops_tbl[type]->drop_ns(ns);
+ spin_unlock(&kobj_ns_type_lock);
+}
+
EXPORT_SYMBOL(kobject_get);
EXPORT_SYMBOL(kobject_put);
-EXPORT_SYMBOL(kobject_add);
EXPORT_SYMBOL(kobject_del);
EXPORT_SYMBOL(kset_register);
Code Review / linux-2.6.git / blobdiff