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lib/kobject.c
13.7 KB
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/* * kobject.c - library routines for handling generic kernel objects * * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org> |
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* Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com> * Copyright (c) 2006-2007 Novell Inc. |
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* * This file is released under the GPLv2. * * * Please see the file Documentation/kobject.txt for critical information * about using the kobject interface. */ #include <linux/kobject.h> #include <linux/string.h> #include <linux/module.h> #include <linux/stat.h> |
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#include <linux/slab.h> |
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/** * 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) { 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))) break; } } return error; } |
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static int create_dir(struct kobject * kobj) |
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{ int error = 0; if (kobject_name(kobj)) { |
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error = sysfs_create_dir(kobj); |
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if (!error) { if ((error = populate_dir(kobj))) 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; /* walk up the ancestors until we hit the one pointing to the * root. * Add 1 to strlen for leading '/' of each level. */ do { |
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if (kobject_name(parent) == NULL) return 0; |
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length += strlen(kobject_name(parent)) + 1; parent = parent->parent; } while (parent); return length; } static void fill_kobj_path(struct kobject *kobj, char *path, int length) { 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); *(path + --length) = '/'; } pr_debug("%s: path = '%s' ",__FUNCTION__,path); } /** |
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* kobject_get_path - generate and return the path associated with a given kobj and kset pair. |
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* * @kobj: kobject in question, with which to build the path * @gfp_mask: the allocation type used to allocate the path |
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* * The result must be freed by the caller with kfree(). |
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*/ |
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char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) |
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{ char *path; int len; len = get_kobj_path_length(kobj); |
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if (len == 0) return NULL; |
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path = kzalloc(len, gfp_mask); |
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if (!path) return NULL; |
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fill_kobj_path(kobj, path, len); return path; } |
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EXPORT_SYMBOL_GPL(kobject_get_path); |
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/** * kobject_init - initialize object. * @kobj: object in question. */ void kobject_init(struct kobject * kobj) { |
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if (!kobj) return; |
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kref_init(&kobj->kref); INIT_LIST_HEAD(&kobj->entry); kobj->kset = kset_get(kobj->kset); } /** * 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. */ static void unlink(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); } /** |
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* kobject_add - add an object to the hierarchy. |
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* @kobj: object. */ |
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int kobject_add(struct kobject * kobj) |
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{ int error = 0; struct kobject * parent; if (!(kobj = kobject_get(kobj))) return -ENOENT; if (!kobj->k_name) |
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kobject_set_name(kobj, "NO_NAME"); |
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if (!*kobj->k_name) { |
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pr_debug("kobject attempted to be registered with no name! "); WARN_ON(1); |
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kobject_put(kobj); |
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return -EINVAL; } |
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parent = kobject_get(kobj->parent); pr_debug("kobject %s: registering. parent: %s, set: %s ", kobject_name(kobj), parent ? kobject_name(parent) : "<NULL>", |
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kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" ); |
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if (kobj->kset) { spin_lock(&kobj->kset->list_lock); if (!parent) parent = kobject_get(&kobj->kset->kobj); list_add_tail(&kobj->entry,&kobj->kset->list); spin_unlock(&kobj->kset->list_lock); |
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kobj->parent = parent; |
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} |
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|
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error = create_dir(kobj); |
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if (error) { /* unlink does the kobject_put() for us */ unlink(kobj); |
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kobject_put(parent); |
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/* be noisy on error issues */ if (error == -EEXIST) |
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printk(KERN_ERR "kobject_add failed for %s with " "-EEXIST, don't try to register things with " "the same name in the same directory. ", |
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kobject_name(kobj)); else |
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printk(KERN_ERR "kobject_add failed for %s (%d) ", |
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kobject_name(kobj), error); |
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dump_stack(); |
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} return error; } |
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/** |
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* kobject_register - initialize and add an object. * @kobj: object in question. */ int kobject_register(struct kobject * kobj) { |
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int error = -EINVAL; |
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if (kobj) { kobject_init(kobj); error = kobject_add(kobj); |
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if (!error) |
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kobject_uevent(kobj, KOBJ_ADD); |
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} |
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return error; } /** * kobject_set_name - Set the name of an object * @kobj: object. |
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* @fmt: format string used to build the name |
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* * If strlen(name) >= KOBJ_NAME_LEN, then use a dynamically allocated * string that @kobj->k_name points to. Otherwise, use the static * @kobj->name array. */ |
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int kobject_set_name(struct kobject * kobj, const char * fmt, ...) { int error = 0; |
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int limit; |
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int need; va_list args; |
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char *name; |
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|
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/* 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); |
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va_end(args); |
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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; |
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} /* Free the old name, if necessary. */ |
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kfree(kobj->k_name); |
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/* Now, set the new name */ kobj->k_name = name; |
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done: |
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return error; } |
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EXPORT_SYMBOL(kobject_set_name); |
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/** * kobject_rename - change the name of an object * @kobj: object in question. * @new_name: object's new name */ |
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int kobject_rename(struct kobject * kobj, const char *new_name) |
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{ int error = 0; |
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const char *devpath = NULL; char *devpath_string = NULL; char *envp[2]; |
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kobj = kobject_get(kobj); if (!kobj) return -EINVAL; |
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if (!kobj->parent) return -EINVAL; |
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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); */ |
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error = sysfs_rename_dir(kobj, new_name); |
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/* 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); |
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kobject_put(kobj); return error; } /** |
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* kobject_move - move object to another parent * @kobj: object in question. |
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* @new_parent: object's new parent (can be NULL) |
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*/ 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) { |
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if (kobj->kset) new_parent = kobject_get(&kobj->kset->kobj); |
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} /* 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; |
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new_parent = NULL; |
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kobject_put(old_parent); kobject_uevent_env(kobj, KOBJ_MOVE, envp); out: |
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kobject_put(new_parent); |
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kobject_put(kobj); kfree(devpath_string); kfree(devpath); return error; } /** |
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* kobject_del - unlink kobject from hierarchy. * @kobj: object. */ void kobject_del(struct kobject * kobj) { |
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if (!kobj) return; |
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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) { |
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if (!kobj) return; |
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pr_debug("kobject %s: unregistering ",kobject_name(kobj)); |
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kobject_uevent(kobj, KOBJ_REMOVE); |
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kobject_del(kobj); kobject_put(kobj); } /** * kobject_get - increment refcount for object. * @kobj: object. */ struct kobject * kobject_get(struct kobject * kobj) { if (kobj) kref_get(&kobj->kref); return kobj; } /** * kobject_cleanup - free kobject resources. * @kobj: object. */ void kobject_cleanup(struct kobject * kobj) { struct kobj_type * t = get_ktype(kobj); struct kset * s = kobj->kset; struct kobject * parent = kobj->parent; |
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const char *name = kobj->k_name; |
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pr_debug("kobject %s: cleaning up ",kobject_name(kobj)); |
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if (t && t->release) { |
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t->release(kobj); |
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/* 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); } |
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if (s) kset_put(s); |
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kobject_put(parent); |
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} static void kobject_release(struct kref *kref) { kobject_cleanup(container_of(kref, struct kobject, kref)); } /** * kobject_put - decrement refcount for object. * @kobj: object. * * Decrement the refcount, and if 0, call kobject_cleanup(). */ void kobject_put(struct kobject * kobj) { if (kobj) kref_put(&kobj->kref, kobject_release); } |
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static void dir_release(struct kobject *kobj) { kfree(kobj); } static struct kobj_type dir_ktype = { .release = dir_release, .sysfs_ops = NULL, .default_attrs = NULL, }; /** |
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* kobject_kset_add_dir - add sub directory of object. |
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* @kset: kset the directory is belongs to. |
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* @parent: object in which a directory is created. * @name: directory name. * * Add a plain directory object as child of given object. */ |
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struct kobject *kobject_kset_add_dir(struct kset *kset, struct kobject *parent, const char *name) |
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{ struct kobject *k; |
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int ret; |
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if (!parent) return NULL; k = kzalloc(sizeof(*k), GFP_KERNEL); if (!k) return NULL; |
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k->kset = kset; |
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k->parent = parent; k->ktype = &dir_ktype; kobject_set_name(k, name); |
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ret = kobject_register(k); if (ret < 0) { |
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printk(KERN_WARNING "%s: kobject_register error: %d ", __func__, ret); |
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kobject_del(k); return NULL; } |
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return k; } |
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|
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/** * 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. */ |
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struct kobject *kobject_add_dir(struct kobject *parent, const char *name) { return kobject_kset_add_dir(NULL, parent, name); } |
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/** * kset_init - initialize a kset for use * @k: kset */ void kset_init(struct kset * k) { kobject_init(&k->kobj); INIT_LIST_HEAD(&k->list); spin_lock_init(&k->list_lock); } /** * kset_add - add a kset object to the hierarchy. * @k: kset. |
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*/ int kset_add(struct kset * k) { |
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return kobject_add(&k->kobj); } /** * kset_register - initialize and add a kset. * @k: kset. */ int kset_register(struct kset * k) { |
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int err; |
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if (!k) return -EINVAL; |
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|
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kset_init(k); |
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err = kset_add(k); if (err) return err; kobject_uevent(&k->kobj, KOBJ_ADD); return 0; |
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} /** * kset_unregister - remove a kset. * @k: kset. */ void kset_unregister(struct kset * k) { |
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if (!k) return; |
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kobject_unregister(&k->kobj); } /** * 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. */ struct kobject * kset_find_obj(struct kset * kset, const char * name) { struct list_head * entry; 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)) { ret = kobject_get(k); break; } } spin_unlock(&kset->list_lock); return ret; } |
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int subsystem_register(struct kset *s) |
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{ |
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return kset_register(s); |
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} |
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void subsystem_unregister(struct kset *s) |
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{ |
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kset_unregister(s); |
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} |
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/** * subsystem_create_file - export sysfs attribute file. * @s: subsystem. * @a: subsystem attribute descriptor. */ |
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int subsys_create_file(struct kset *s, struct subsys_attribute *a) |
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{ int error = 0; |
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634 635 636 |
if (!s || !a) return -EINVAL; |
1ef4cfac0 Driver core: remo... |
637 |
if (kset_get(s)) { |
823bccfc4 remove "struct su... |
638 |
error = sysfs_create_file(&s->kobj, &a->attr); |
6e9d930d1 Driver core: remo... |
639 |
kset_put(s); |
1da177e4c Linux-2.6.12-rc2 |
640 641 642 |
} return error; } |
1da177e4c Linux-2.6.12-rc2 |
643 644 645 646 647 648 649 650 651 652 |
EXPORT_SYMBOL(kobject_init); EXPORT_SYMBOL(kobject_register); EXPORT_SYMBOL(kobject_unregister); EXPORT_SYMBOL(kobject_get); EXPORT_SYMBOL(kobject_put); EXPORT_SYMBOL(kobject_add); EXPORT_SYMBOL(kobject_del); EXPORT_SYMBOL(kset_register); EXPORT_SYMBOL(kset_unregister); |
1da177e4c Linux-2.6.12-rc2 |
653 |
|
1da177e4c Linux-2.6.12-rc2 |
654 655 656 |
EXPORT_SYMBOL(subsystem_register); EXPORT_SYMBOL(subsystem_unregister); EXPORT_SYMBOL(subsys_create_file); |