/* * 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. * * * 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>#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. * */ 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;} 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))) 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 { if (kobject_name(parent) == NULL) return 0; 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'\n",__FUNCTION__,path);} /** * 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){ char *path; int len; len = get_kobj_path_length(kobj); if (len == 0) return NULL; path = kzalloc(len, gfp_mask); if (!path) return NULL; fill_kobj_path(kobj, path, len); return path;}EXPORT_SYMBOL_GPL(kobject_get_path); /** * kobject_init - initialize object. * @kobj: object in question. */void kobject_init(struct kobject * kobj){ if (!kobj) return; 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);} /** * kobject_add - add an object to the hierarchy. * @kobj: object. */ int kobject_add(struct kobject * kobj){ int error = 0; struct kobject * parent; if (!(kobj = kobject_get(kobj))) return -ENOENT; if (!kobj->k_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 ? kobject_name(&kobj->kset->kobj) : "<NULL>" ); 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); kobj->parent = parent; } error = create_dir(kobj); if (error) { /* unlink does the kobject_put() for us */ unlink(kobj); 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 = -EINVAL; if (kobj) { kobject_init(kobj); error = kobject_add(kobj); if (!error) kobject_uevent(kobj, KOBJ_ADD); } return error;} /** * kobject_set_name - Set the name of a kobject * @kobj: kobject to name * @fmt: format string used to build the name * * This sets the name of the kobject. If you have already added the * kobject to the system, you must call kobject_rename() in order to * change the name of the kobject. */int kobject_set_name(struct kobject * kobj, const char * fmt, ...){ int error = 0; int limit; int need; va_list args; char *name; /* 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); 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. */ kfree(kobj->k_name); /* Now, set the new name */ kobj->k_name = name;done: return error;}EXPORT_SYMBOL(kobject_set_name); /** * kobject_rename - change the name of an object * @kobj: object in question. * @new_name: object's new name */ 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; /* 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; 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);} /** * 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: unregistering\n",kobject_name(kobj)); kobject_uevent(kobj, KOBJ_REMOVE); 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; const char *name = kobj->k_name; pr_debug("kobject %s: cleaning up\n",kobject_name(kobj)); 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); kobject_put(parent);} 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);} static void dir_release(struct kobject *kobj){ kfree(kobj);} static struct kobj_type dir_ktype = { .release = dir_release, .sysfs_ops = NULL, .default_attrs = NULL,};Lines 1–500 of 678. 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/* * 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. * * * 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> #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. * */ 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; } 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))) 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 { if (kobject_name(parent) == NULL) return 0; 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'\n",__FUNCTION__,path); } /** * 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) { char *path; int len; len = get_kobj_path_length(kobj); if (len == 0) return NULL; path = kzalloc(len, gfp_mask); if (!path) return NULL; fill_kobj_path(kobj, path, len); return path; } EXPORT_SYMBOL_GPL(kobject_get_path); /** * kobject_init - initialize object. * @kobj: object in question. */ void kobject_init(struct kobject * kobj) { if (!kobj) return; 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); } /** * kobject_add - add an object to the hierarchy. * @kobj: object. */ int kobject_add(struct kobject * kobj) { int error = 0; struct kobject * parent; if (!(kobj = kobject_get(kobj))) return -ENOENT; if (!kobj->k_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 ? kobject_name(&kobj->kset->kobj) : "<NULL>" ); 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); kobj->parent = parent; } error = create_dir(kobj); if (error) { /* unlink does the kobject_put() for us */ unlink(kobj); 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 = -EINVAL; if (kobj) { kobject_init(kobj); error = kobject_add(kobj); if (!error) kobject_uevent(kobj, KOBJ_ADD); } return error; } /** * kobject_set_name - Set the name of a kobject * @kobj: kobject to name * @fmt: format string used to build the name * * This sets the name of the kobject. If you have already added the * kobject to the system, you must call kobject_rename() in order to * change the name of the kobject. */ int kobject_set_name(struct kobject * kobj, const char * fmt, ...) { int error = 0; int limit; int need; va_list args; char *name; /* 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); 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. */ kfree(kobj->k_name); /* Now, set the new name */ kobj->k_name = name; done: return error; } EXPORT_SYMBOL(kobject_set_name); /** * kobject_rename - change the name of an object * @kobj: object in question. * @new_name: object's new name */ 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; /* 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; 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); } /** * 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: unregistering\n",kobject_name(kobj)); kobject_uevent(kobj, KOBJ_REMOVE); 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; const char *name = kobj->k_name; pr_debug("kobject %s: cleaning up\n",kobject_name(kobj)); 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); kobject_put(parent); } 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); } static void dir_release(struct kobject *kobj) { kfree(kobj); } static struct kobj_type dir_ktype = { .release = dir_release, .sysfs_ops = NULL, .default_attrs = NULL, };