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lib/kobject.c
28.2 KB
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// SPDX-License-Identifier: GPL-2.0 |
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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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* |
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* Please see the file Documentation/kobject.txt for critical information * about using the kobject interface. */ #include <linux/kobject.h> #include <linux/string.h> |
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#include <linux/export.h> |
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#include <linux/stat.h> |
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#include <linux/slab.h> |
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#include <linux/random.h> |
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|
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/** |
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* kobject_namespace() - Return @kobj's namespace tag. |
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* @kobj: kobject in question * * Returns namespace tag of @kobj if its parent has namespace ops enabled * and thus @kobj should have a namespace tag associated with it. Returns * %NULL otherwise. */ const void *kobject_namespace(struct kobject *kobj) { const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj); if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE) return NULL; |
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return kobj->ktype->namespace(kobj); |
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} |
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/** |
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* kobject_get_ownership() - Get sysfs ownership data for @kobj. |
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* @kobj: kobject in question * @uid: kernel user ID for sysfs objects * @gid: kernel group ID for sysfs objects * * Returns initial uid/gid pair that should be used when creating sysfs * representation of given kobject. Normally used to adjust ownership of * objects in a container. */ void kobject_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) { *uid = GLOBAL_ROOT_UID; *gid = GLOBAL_ROOT_GID; if (kobj->ktype->get_ownership) kobj->ktype->get_ownership(kobj, uid, gid); } |
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/* * populate_dir - populate directory with attributes. * @kobj: object we're working on. |
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* |
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* 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. |
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*/ |
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static int populate_dir(struct kobject *kobj) |
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{ |
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struct kobj_type *t = get_ktype(kobj); struct attribute *attr; |
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int error = 0; int i; |
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|
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if (t && t->default_attrs) { for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { |
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error = sysfs_create_file(kobj, attr); if (error) |
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break; } } return error; } |
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static int create_dir(struct kobject *kobj) |
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{ |
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const struct kobj_type *ktype = get_ktype(kobj); |
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const struct kobj_ns_type_operations *ops; |
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int error; error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); |
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if (error) return error; error = populate_dir(kobj); if (error) { sysfs_remove_dir(kobj); return error; |
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} |
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if (ktype) { error = sysfs_create_groups(kobj, ktype->default_groups); if (error) { sysfs_remove_dir(kobj); return error; } } |
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/* * @kobj->sd may be deleted by an ancestor going away. Hold an * extra reference so that it stays until @kobj is gone. */ sysfs_get(kobj->sd); |
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/* * If @kobj has ns_ops, its children need to be filtered based on * their namespace tags. Enable namespace support on @kobj->sd. */ ops = kobj_child_ns_ops(kobj); if (ops) { BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); BUG_ON(ops->type >= KOBJ_NS_TYPES); BUG_ON(!kobj_ns_type_registered(ops->type)); |
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sysfs_enable_ns(kobj->sd); |
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} return 0; |
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} |
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static int get_kobj_path_length(struct kobject *kobj) { int length = 1; |
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struct kobject *parent = kobj; |
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|
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/* walk up the ancestors until we hit the one pointing to the |
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* 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) { |
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struct kobject *parent; |
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--length; for (parent = kobj; parent; parent = parent->parent) { int cur = strlen(kobject_name(parent)); /* back up enough to print this name with '/' */ length -= cur; |
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memcpy(path + length, kobject_name(parent), cur); |
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*(path + --length) = '/'; } |
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pr_debug("kobject: '%s' (%p): %s: path = '%s' ", kobject_name(kobj), |
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kobj, __func__, path); |
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} /** |
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* kobject_get_path() - Allocate memory and fill in the path for @kobj. |
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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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* |
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* Return: The newly allocated memory, caller must free 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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|
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/* add the kobject to its kset's list */ static void kobj_kset_join(struct kobject *kobj) |
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{ |
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if (!kobj->kset) |
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return; |
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kset_get(kobj->kset); spin_lock(&kobj->kset->list_lock); list_add_tail(&kobj->entry, &kobj->kset->list); spin_unlock(&kobj->kset->list_lock); |
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} |
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/* remove the kobject from its kset's list */ static void kobj_kset_leave(struct kobject *kobj) { if (!kobj->kset) return; |
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spin_lock(&kobj->kset->list_lock); list_del_init(&kobj->entry); spin_unlock(&kobj->kset->list_lock); kset_put(kobj->kset); } |
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static void kobject_init_internal(struct kobject *kobj) |
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{ |
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if (!kobj) return; kref_init(&kobj->kref); INIT_LIST_HEAD(&kobj->entry); |
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kobj->state_in_sysfs = 0; kobj->state_add_uevent_sent = 0; kobj->state_remove_uevent_sent = 0; kobj->state_initialized = 1; |
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} |
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static int kobject_add_internal(struct kobject *kobj) |
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{ int error = 0; |
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struct kobject *parent; |
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|
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if (!kobj) |
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return -ENOENT; |
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if (!kobj->name || !kobj->name[0]) { |
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WARN(1, "kobject: (%p): attempted to be registered with empty name! ", kobj); |
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return -EINVAL; } |
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|
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parent = kobject_get(kobj->parent); |
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/* join kset if set, use it as parent if we do not already have one */ |
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if (kobj->kset) { |
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if (!parent) |
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parent = kobject_get(&kobj->kset->kobj); |
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kobj_kset_join(kobj); |
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kobj->parent = parent; |
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} |
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pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s' ", |
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kobject_name(kobj), kobj, __func__, |
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parent ? kobject_name(parent) : "<NULL>", |
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kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); |
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|
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error = create_dir(kobj); |
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if (error) { |
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kobj_kset_leave(kobj); kobject_put(parent); kobj->parent = NULL; |
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/* be noisy on error issues */ if (error == -EEXIST) |
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pr_err("%s failed for %s with -EEXIST, don't try to register things with the same name in the same directory. ", __func__, kobject_name(kobj)); |
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else |
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pr_err("%s failed for %s (error: %d parent: %s) ", __func__, kobject_name(kobj), error, parent ? kobject_name(parent) : "'none'"); |
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} else kobj->state_in_sysfs = 1; |
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return error; } |
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/** |
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* kobject_set_name_vargs() - Set the name of a kobject. |
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* @kobj: struct kobject to set the name of * @fmt: format string used to build the name * @vargs: vargs to format the string. */ |
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int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
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va_list vargs) { |
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const char *s; |
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|
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if (kobj->name && !fmt) return 0; |
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s = kvasprintf_const(GFP_KERNEL, fmt, vargs); |
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if (!s) |
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return -ENOMEM; |
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|
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/* * ewww... some of these buggers have '/' in the name ... If * that's the case, we need to make sure we have an actual * allocated copy to modify, since kvasprintf_const may have * returned something from .rodata. */ if (strchr(s, '/')) { char *t; t = kstrdup(s, GFP_KERNEL); kfree_const(s); if (!t) return -ENOMEM; strreplace(t, '/', '!'); s = t; } kfree_const(kobj->name); |
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kobj->name = s; |
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|
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return 0; } |
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/** |
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* kobject_set_name() - Set the name of a kobject. |
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* @kobj: struct kobject to set the name of |
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* @fmt: format string used to build the name |
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* |
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* 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. |
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*/ |
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int kobject_set_name(struct kobject *kobj, const char *fmt, ...) |
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{ |
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va_list vargs; |
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int retval; |
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|
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va_start(vargs, fmt); retval = kobject_set_name_vargs(kobj, fmt, vargs); va_end(vargs); |
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|
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return retval; |
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} |
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EXPORT_SYMBOL(kobject_set_name); |
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/** |
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* kobject_init() - Initialize a kobject structure. |
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* @kobj: pointer to the kobject to initialize * @ktype: pointer to the ktype for this kobject. * * This function will properly initialize a kobject such that it can then * be passed to the kobject_add() call. * * After this function is called, the kobject MUST be cleaned up by a call * to kobject_put(), not by a call to kfree directly to ensure that all of * the memory is cleaned up properly. */ |
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void kobject_init(struct kobject *kobj, struct kobj_type *ktype) |
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{ char *err_str; if (!kobj) { err_str = "invalid kobject pointer!"; goto error; } if (!ktype) { err_str = "must have a ktype to be initialized properly! "; goto error; } |
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if (kobj->state_initialized) { |
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/* do not error out as sometimes we can recover */ |
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pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong. ", kobj); |
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dump_stack(); } |
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kobject_init_internal(kobj); |
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kobj->ktype = ktype; return; error: |
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pr_err("kobject (%p): %s ", kobj, err_str); |
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dump_stack(); } |
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EXPORT_SYMBOL(kobject_init); |
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|
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static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, struct kobject *parent, const char *fmt, va_list vargs) |
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{ |
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int retval; |
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retval = kobject_set_name_vargs(kobj, fmt, vargs); |
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if (retval) { |
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pr_err("kobject: can not set name properly! "); |
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return retval; } kobj->parent = parent; |
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return kobject_add_internal(kobj); |
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} /** |
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* kobject_add() - The main kobject add function. |
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* @kobj: the kobject to add * @parent: pointer to the parent of the kobject. * @fmt: format to name the kobject with. * * The kobject name is set and added to the kobject hierarchy in this * function. * * If @parent is set, then the parent of the @kobj will be set to it. * If @parent is NULL, then the parent of the @kobj will be set to the |
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* kobject associated with the kset assigned to this kobject. If no kset |
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* is assigned to the kobject, then the kobject will be located in the * root of the sysfs tree. * |
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* Note, no "add" uevent will be created with this call, the caller should set |
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* 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. |
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* * Return: If this function returns an error, kobject_put() must be * called to properly clean up the memory associated with the * object. Under no instance should the kobject that is passed * to this function be directly freed with a call to kfree(), * that can leak memory. * |
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* If this function returns success, kobject_put() must also be called * in order to properly clean up the memory associated with the object. * * In short, once this function is called, kobject_put() MUST be called * when the use of the object is finished in order to properly free * everything. |
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*/ |
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int kobject_add(struct kobject *kobj, struct kobject *parent, const char *fmt, ...) |
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{ va_list args; int retval; if (!kobj) return -EINVAL; |
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if (!kobj->state_initialized) { |
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pr_err("kobject '%s' (%p): tried to add an uninitialized object, something is seriously wrong. ", |
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kobject_name(kobj), kobj); dump_stack(); return -EINVAL; } |
244f6cee9 kobject: add kobj... |
434 435 436 437 438 439 |
va_start(args, fmt); retval = kobject_add_varg(kobj, parent, fmt, args); va_end(args); return retval; } |
b2d6db587 Kobject: rename k... |
440 |
EXPORT_SYMBOL(kobject_add); |
244f6cee9 kobject: add kobj... |
441 |
|
e86000d04 kobject: add kobj... |
442 |
/** |
ed856349d kobject: Fix kern... |
443 444 |
* kobject_init_and_add() - Initialize a kobject structure and add it to * the kobject hierarchy. |
c11c4154e kobject: add kobj... |
445 446 447 448 449 |
* @kobj: pointer to the kobject to initialize * @ktype: pointer to the ktype for this kobject. * @parent: pointer to the parent of this kobject. * @fmt: the name of the kobject. * |
1fd7c3b43 kobject: Improve ... |
450 451 452 453 454 455 |
* This function combines the call to kobject_init() and kobject_add(). * * If this function returns an error, kobject_put() must be called to * properly clean up the memory associated with the object. This is the * same type of error handling after a call to kobject_add() and kobject * lifetime rules are the same here. |
c11c4154e kobject: add kobj... |
456 457 458 459 460 461 |
*/ int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, struct kobject *parent, const char *fmt, ...) { va_list args; int retval; |
f9cb074bf Kobject: rename k... |
462 |
kobject_init(kobj, ktype); |
c11c4154e kobject: add kobj... |
463 464 465 466 467 468 469 470 471 472 |
va_start(args, fmt); retval = kobject_add_varg(kobj, parent, fmt, args); va_end(args); return retval; } EXPORT_SYMBOL_GPL(kobject_init_and_add); /** |
ed856349d kobject: Fix kern... |
473 |
* kobject_rename() - Change the name of an object. |
e374a2bfe Kobject: fix codi... |
474 475 |
* @kobj: object in question. * @new_name: object's new name |
030c1d2bf kobject: Fix kobj... |
476 477 478 479 480 |
* * 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. |
1da177e4c Linux-2.6.12-rc2 |
481 |
*/ |
e374a2bfe Kobject: fix codi... |
482 |
int kobject_rename(struct kobject *kobj, const char *new_name) |
1da177e4c Linux-2.6.12-rc2 |
483 484 |
{ int error = 0; |
ca2f37dbc Driver core: noti... |
485 |
const char *devpath = NULL; |
0b4a4fea2 kobject: Cleanup ... |
486 |
const char *dup_name = NULL, *name; |
ca2f37dbc Driver core: noti... |
487 488 |
char *devpath_string = NULL; char *envp[2]; |
1da177e4c Linux-2.6.12-rc2 |
489 490 491 492 |
kobj = kobject_get(kobj); if (!kobj) return -EINVAL; |
122f8ec7b lib : kobject: fi... |
493 494 |
if (!kobj->parent) { kobject_put(kobj); |
b592fcfe7 sysfs: Shadow dir... |
495 |
return -EINVAL; |
122f8ec7b lib : kobject: fi... |
496 |
} |
ca2f37dbc Driver core: noti... |
497 498 499 500 501 502 503 504 505 506 507 508 509 510 |
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; |
ca2f37dbc Driver core: noti... |
511 |
|
f773f32d7 lib/kobject.c: us... |
512 |
name = dup_name = kstrdup_const(new_name, GFP_KERNEL); |
0b4a4fea2 kobject: Cleanup ... |
513 514 515 516 |
if (!name) { error = -ENOMEM; goto out; } |
e34ff4906 sysfs: remove kty... |
517 |
error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); |
0b4a4fea2 kobject: Cleanup ... |
518 519 520 521 522 523 |
if (error) goto out; /* Install the new kobject name */ dup_name = kobj->name; kobj->name = name; |
ca2f37dbc Driver core: noti... |
524 525 526 527 |
/* 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. */ |
0b4a4fea2 kobject: Cleanup ... |
528 |
kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
ca2f37dbc Driver core: noti... |
529 530 |
out: |
f773f32d7 lib/kobject.c: us... |
531 |
kfree_const(dup_name); |
ca2f37dbc Driver core: noti... |
532 533 |
kfree(devpath_string); kfree(devpath); |
b592fcfe7 sysfs: Shadow dir... |
534 535 536 537 |
kobject_put(kobj); return error; } |
8344b568f PCI: ACPI PCI slo... |
538 |
EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe7 sysfs: Shadow dir... |
539 540 |
/** |
ed856349d kobject: Fix kern... |
541 |
* kobject_move() - Move object to another parent. |
e374a2bfe Kobject: fix codi... |
542 543 |
* @kobj: object in question. * @new_parent: object's new parent (can be NULL) |
8a82472f8 driver core: Intr... |
544 |
*/ |
8a82472f8 driver core: Intr... |
545 546 547 548 549 550 551 552 553 554 555 556 557 |
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) { |
c744aeae9 driver core: Allo... |
558 559 |
if (kobj->kset) new_parent = kobject_get(&kobj->kset->kobj); |
8a82472f8 driver core: Intr... |
560 |
} |
e34ff4906 sysfs: remove kty... |
561 |
|
8a82472f8 driver core: Intr... |
562 563 564 565 566 567 568 569 570 571 572 573 574 575 |
/* 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; |
e34ff4906 sysfs: remove kty... |
576 |
error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); |
8a82472f8 driver core: Intr... |
577 578 579 580 |
if (error) goto out; old_parent = kobj->parent; kobj->parent = new_parent; |
9e993efb0 kobject: new_devi... |
581 |
new_parent = NULL; |
8a82472f8 driver core: Intr... |
582 583 584 |
kobject_put(old_parent); kobject_uevent_env(kobj, KOBJ_MOVE, envp); out: |
9e993efb0 kobject: new_devi... |
585 |
kobject_put(new_parent); |
8a82472f8 driver core: Intr... |
586 587 588 589 590 |
kobject_put(kobj); kfree(devpath_string); kfree(devpath); return error; } |
24199d206 lib: export symbo... |
591 |
EXPORT_SYMBOL_GPL(kobject_move); |
8a82472f8 driver core: Intr... |
592 |
|
adbb26e2d kobject: Avoid pr... |
593 |
static void __kobject_del(struct kobject *kobj) |
1da177e4c Linux-2.6.12-rc2 |
594 |
{ |
324a56e16 kernfs: s/sysfs_d... |
595 |
struct kernfs_node *sd; |
3d378dc71 kobject: fix dere... |
596 |
const struct kobj_type *ktype; |
26ea12dec kobject: grab an ... |
597 |
|
31b9025aa Kobject: make kob... |
598 599 |
if (!kobj) return; |
0f4dafc05 Kobject: auto-cle... |
600 |
|
26ea12dec kobject: grab an ... |
601 |
sd = kobj->sd; |
3d378dc71 kobject: fix dere... |
602 |
ktype = get_ktype(kobj); |
aa30f47cf kobject: Add supp... |
603 604 605 |
if (ktype) sysfs_remove_groups(kobj, ktype->default_groups); |
1da177e4c Linux-2.6.12-rc2 |
606 |
sysfs_remove_dir(kobj); |
26ea12dec kobject: grab an ... |
607 |
sysfs_put(sd); |
0f4dafc05 Kobject: auto-cle... |
608 609 |
kobj->state_in_sysfs = 0; kobj_kset_leave(kobj); |
0f4dafc05 Kobject: auto-cle... |
610 |
kobj->parent = NULL; |
1da177e4c Linux-2.6.12-rc2 |
611 |
} |
adbb26e2d kobject: Avoid pr... |
612 613 614 615 616 617 618 619 620 621 |
/** * kobject_del() - Unlink kobject from hierarchy. * @kobj: object. * * This is the function that should be called to delete an object * successfully added via kobject_add(). */ void kobject_del(struct kobject *kobj) { |
b9fb631f6 kobject: Restore ... |
622 623 624 625 |
struct kobject *parent; if (!kobj) return; |
adbb26e2d kobject: Avoid pr... |
626 |
|
b9fb631f6 kobject: Restore ... |
627 |
parent = kobj->parent; |
adbb26e2d kobject: Avoid pr... |
628 629 630 |
__kobject_del(kobj); kobject_put(parent); } |
fa40ae344 kobject: move EXP... |
631 |
EXPORT_SYMBOL(kobject_del); |
1da177e4c Linux-2.6.12-rc2 |
632 633 |
/** |
ed856349d kobject: Fix kern... |
634 |
* kobject_get() - Increment refcount for object. |
e374a2bfe Kobject: fix codi... |
635 |
* @kobj: object. |
1da177e4c Linux-2.6.12-rc2 |
636 |
*/ |
e374a2bfe Kobject: fix codi... |
637 |
struct kobject *kobject_get(struct kobject *kobj) |
1da177e4c Linux-2.6.12-rc2 |
638 |
{ |
d82d54af7 kobject: WARN as ... |
639 640 |
if (kobj) { if (!kobj->state_initialized) |
82d1f1178 lib/kobject: Join... |
641 642 643 644 |
WARN(1, KERN_WARNING "kobject: '%s' (%p): is not initialized, yet kobject_get() is being called. ", kobject_name(kobj), kobj); |
1da177e4c Linux-2.6.12-rc2 |
645 |
kref_get(&kobj->kref); |
d82d54af7 kobject: WARN as ... |
646 |
} |
1da177e4c Linux-2.6.12-rc2 |
647 648 |
return kobj; } |
fa40ae344 kobject: move EXP... |
649 |
EXPORT_SYMBOL(kobject_get); |
1da177e4c Linux-2.6.12-rc2 |
650 |
|
c70c176ff kobject: Export k... |
651 |
struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) |
a49b7e82c kobject: fix kset... |
652 |
{ |
c70c176ff kobject: Export k... |
653 654 |
if (!kobj) return NULL; |
a49b7e82c kobject: fix kset... |
655 656 657 658 |
if (!kref_get_unless_zero(&kobj->kref)) kobj = NULL; return kobj; } |
c70c176ff kobject: Export k... |
659 |
EXPORT_SYMBOL(kobject_get_unless_zero); |
a49b7e82c kobject: fix kset... |
660 |
|
18041f477 kobject: make kob... |
661 662 663 |
/* * kobject_cleanup - free kobject resources. * @kobj: object to cleanup |
1da177e4c Linux-2.6.12-rc2 |
664 |
*/ |
18041f477 kobject: make kob... |
665 |
static void kobject_cleanup(struct kobject *kobj) |
1da177e4c Linux-2.6.12-rc2 |
666 |
{ |
adbb26e2d kobject: Avoid pr... |
667 |
struct kobject *parent = kobj->parent; |
0f4dafc05 Kobject: auto-cle... |
668 |
struct kobj_type *t = get_ktype(kobj); |
af5ca3f4e Driver core: chan... |
669 |
const char *name = kobj->name; |
1da177e4c Linux-2.6.12-rc2 |
670 |
|
c817a67ec kobject: delayed ... |
671 672 673 |
pr_debug("kobject: '%s' (%p): %s, parent %p ", kobject_name(kobj), kobj, __func__, kobj->parent); |
0f4dafc05 Kobject: auto-cle... |
674 675 |
if (t && !t->release) |
186bddb28 kref/kobject: Imp... |
676 677 |
pr_debug("kobject: '%s' (%p): does not have a release() function, it is broken and must be fixed. See Documentation/kobject.txt. ", |
0f4dafc05 Kobject: auto-cle... |
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 |
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 ", 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 ", kobject_name(kobj), kobj); |
adbb26e2d kobject: Avoid pr... |
693 694 695 696 |
__kobject_del(kobj); } else { /* avoid dropping the parent reference unnecessarily */ parent = NULL; |
0f4dafc05 Kobject: auto-cle... |
697 |
} |
ce2c9cb02 kobject: remove t... |
698 |
if (t && t->release) { |
0f4dafc05 Kobject: auto-cle... |
699 700 701 |
pr_debug("kobject: '%s' (%p): calling ktype release ", kobject_name(kobj), kobj); |
1da177e4c Linux-2.6.12-rc2 |
702 |
t->release(kobj); |
0f4dafc05 Kobject: auto-cle... |
703 704 705 |
} /* free name if we allocated it */ |
af5ca3f4e Driver core: chan... |
706 |
if (name) { |
0f4dafc05 Kobject: auto-cle... |
707 708 |
pr_debug("kobject: '%s': free name ", name); |
f773f32d7 lib/kobject.c: us... |
709 |
kfree_const(name); |
ce2c9cb02 kobject: remove t... |
710 |
} |
adbb26e2d kobject: Avoid pr... |
711 712 |
kobject_put(parent); |
1da177e4c Linux-2.6.12-rc2 |
713 |
} |
c817a67ec kobject: delayed ... |
714 715 716 717 718 719 720 |
#ifdef CONFIG_DEBUG_KOBJECT_RELEASE static void kobject_delayed_cleanup(struct work_struct *work) { kobject_cleanup(container_of(to_delayed_work(work), struct kobject, release)); } #endif |
1da177e4c Linux-2.6.12-rc2 |
721 722 |
static void kobject_release(struct kref *kref) { |
c817a67ec kobject: delayed ... |
723 724 |
struct kobject *kobj = container_of(kref, struct kobject, kref); #ifdef CONFIG_DEBUG_KOBJECT_RELEASE |
89c86a64c kobject: delay ko... |
725 726 727 728 |
unsigned long delay = HZ + HZ * (get_random_int() & 0x3); pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld) ", kobject_name(kobj), kobj, __func__, kobj->parent, delay); |
c817a67ec kobject: delayed ... |
729 |
INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); |
89c86a64c kobject: delay ko... |
730 731 |
schedule_delayed_work(&kobj->release, delay); |
c817a67ec kobject: delayed ... |
732 733 734 |
#else kobject_cleanup(kobj); #endif |
1da177e4c Linux-2.6.12-rc2 |
735 736 737 |
} /** |
ed856349d kobject: Fix kern... |
738 |
* kobject_put() - Decrement refcount for object. |
e374a2bfe Kobject: fix codi... |
739 |
* @kobj: object. |
1da177e4c Linux-2.6.12-rc2 |
740 |
* |
e374a2bfe Kobject: fix codi... |
741 |
* Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4c Linux-2.6.12-rc2 |
742 |
*/ |
e374a2bfe Kobject: fix codi... |
743 |
void kobject_put(struct kobject *kobj) |
1da177e4c Linux-2.6.12-rc2 |
744 |
{ |
c1ebdae51 kobject: catch ko... |
745 |
if (kobj) { |
d955c78ac Example use of WA... |
746 |
if (!kobj->state_initialized) |
82d1f1178 lib/kobject: Join... |
747 748 749 750 |
WARN(1, KERN_WARNING "kobject: '%s' (%p): is not initialized, yet kobject_put() is being called. ", kobject_name(kobj), kobj); |
1da177e4c Linux-2.6.12-rc2 |
751 |
kref_put(&kobj->kref, kobject_release); |
c1ebdae51 kobject: catch ko... |
752 |
} |
1da177e4c Linux-2.6.12-rc2 |
753 |
} |
fa40ae344 kobject: move EXP... |
754 |
EXPORT_SYMBOL(kobject_put); |
1da177e4c Linux-2.6.12-rc2 |
755 |
|
3f9e3ee9d kobject: add kobj... |
756 |
static void dynamic_kobj_release(struct kobject *kobj) |
7423172a5 [PATCH] kobject_a... |
757 |
{ |
810304db7 lib: replace rema... |
758 759 |
pr_debug("kobject: (%p): %s ", kobj, __func__); |
7423172a5 [PATCH] kobject_a... |
760 761 |
kfree(kobj); } |
3f9e3ee9d kobject: add kobj... |
762 |
static struct kobj_type dynamic_kobj_ktype = { |
386f275f5 Driver Core: swit... |
763 764 |
.release = dynamic_kobj_release, .sysfs_ops = &kobj_sysfs_ops, |
7423172a5 [PATCH] kobject_a... |
765 |
}; |
43968d2f1 kobject: get rid ... |
766 |
/** |
ed856349d kobject: Fix kern... |
767 |
* kobject_create() - Create a struct kobject dynamically. |
3f9e3ee9d kobject: add kobj... |
768 769 770 771 772 |
* * This function creates a kobject structure dynamically and sets it up * to be a "dynamic" kobject with a default release function set up. * * If the kobject was not able to be created, NULL will be returned. |
43968d2f1 kobject: get rid ... |
773 |
* The kobject structure returned from here must be cleaned up with a |
f9cb074bf Kobject: rename k... |
774 |
* call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f1 kobject: get rid ... |
775 |
* already been called on this structure. |
3f9e3ee9d kobject: add kobj... |
776 |
*/ |
43968d2f1 kobject: get rid ... |
777 |
struct kobject *kobject_create(void) |
3f9e3ee9d kobject: add kobj... |
778 779 780 781 782 783 |
{ struct kobject *kobj; kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); if (!kobj) return NULL; |
f9cb074bf Kobject: rename k... |
784 |
kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9d kobject: add kobj... |
785 786 787 788 |
return kobj; } /** |
ed856349d kobject: Fix kern... |
789 790 |
* kobject_create_and_add() - Create a struct kobject dynamically and * register it with sysfs. |
9ff1f838e kobject: fix the ... |
791 |
* @name: the name for the kobject |
3f9e3ee9d kobject: add kobj... |
792 793 |
* @parent: the parent kobject of this kobject, if any. * |
f70701a34 kobject: kerneldo... |
794 |
* This function creates a kobject structure dynamically and registers it |
3f9e3ee9d kobject: add kobj... |
795 |
* with sysfs. When you are finished with this structure, call |
78a2d906b Kobject: convert ... |
796 |
* kobject_put() and the structure will be dynamically freed when |
3f9e3ee9d kobject: add kobj... |
797 798 799 800 801 802 803 804 805 806 807 808 |
* it is no longer being used. * * If the kobject was not able to be created, NULL will be returned. */ struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) { struct kobject *kobj; int retval; kobj = kobject_create(); if (!kobj) return NULL; |
b2d6db587 Kobject: rename k... |
809 |
retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9d kobject: add kobj... |
810 |
if (retval) { |
82d1f1178 lib/kobject: Join... |
811 812 |
pr_warn("%s: kobject_add error: %d ", __func__, retval); |
3f9e3ee9d kobject: add kobj... |
813 814 815 816 817 818 |
kobject_put(kobj); kobj = NULL; } return kobj; } EXPORT_SYMBOL_GPL(kobject_create_and_add); |
7423172a5 [PATCH] kobject_a... |
819 |
/** |
ed856349d kobject: Fix kern... |
820 |
* kset_init() - Initialize a kset for use. |
e374a2bfe Kobject: fix codi... |
821 |
* @k: kset |
1da177e4c Linux-2.6.12-rc2 |
822 |
*/ |
e374a2bfe Kobject: fix codi... |
823 |
void kset_init(struct kset *k) |
1da177e4c Linux-2.6.12-rc2 |
824 |
{ |
e1543ddf7 Kobject: remove k... |
825 |
kobject_init_internal(&k->kobj); |
1da177e4c Linux-2.6.12-rc2 |
826 827 828 |
INIT_LIST_HEAD(&k->list); spin_lock_init(&k->list_lock); } |
23b5212cc Driver Core: add ... |
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 |
/* default kobject attribute operations */ static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct kobj_attribute *kattr; ssize_t ret = -EIO; kattr = container_of(attr, struct kobj_attribute, attr); if (kattr->show) ret = kattr->show(kobj, kattr, buf); return ret; } static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) { struct kobj_attribute *kattr; ssize_t ret = -EIO; kattr = container_of(attr, struct kobj_attribute, attr); if (kattr->store) ret = kattr->store(kobj, kattr, buf, count); return ret; } |
52cf25d0a Driver core: Cons... |
853 |
const struct sysfs_ops kobj_sysfs_ops = { |
23b5212cc Driver Core: add ... |
854 855 856 |
.show = kobj_attr_show, .store = kobj_attr_store, }; |
29dfe2dc0 kobject: export k... |
857 |
EXPORT_SYMBOL_GPL(kobj_sysfs_ops); |
1da177e4c Linux-2.6.12-rc2 |
858 859 |
/** |
ed856349d kobject: Fix kern... |
860 |
* kset_register() - Initialize and add a kset. |
e374a2bfe Kobject: fix codi... |
861 |
* @k: kset. |
1da177e4c Linux-2.6.12-rc2 |
862 |
*/ |
e374a2bfe Kobject: fix codi... |
863 |
int kset_register(struct kset *k) |
1da177e4c Linux-2.6.12-rc2 |
864 |
{ |
80f03e349 Driver core: add ... |
865 |
int err; |
31b9025aa Kobject: make kob... |
866 867 |
if (!k) return -EINVAL; |
80f03e349 Driver core: add ... |
868 |
|
1da177e4c Linux-2.6.12-rc2 |
869 |
kset_init(k); |
12e339ac6 Kset: remove kset... |
870 |
err = kobject_add_internal(&k->kobj); |
80f03e349 Driver core: add ... |
871 872 873 874 |
if (err) return err; kobject_uevent(&k->kobj, KOBJ_ADD); return 0; |
1da177e4c Linux-2.6.12-rc2 |
875 |
} |
fa40ae344 kobject: move EXP... |
876 |
EXPORT_SYMBOL(kset_register); |
1da177e4c Linux-2.6.12-rc2 |
877 |
|
1da177e4c Linux-2.6.12-rc2 |
878 |
/** |
ed856349d kobject: Fix kern... |
879 |
* kset_unregister() - Remove a kset. |
e374a2bfe Kobject: fix codi... |
880 |
* @k: kset. |
1da177e4c Linux-2.6.12-rc2 |
881 |
*/ |
e374a2bfe Kobject: fix codi... |
882 |
void kset_unregister(struct kset *k) |
1da177e4c Linux-2.6.12-rc2 |
883 |
{ |
31b9025aa Kobject: make kob... |
884 885 |
if (!k) return; |
35a5fe695 kobject: remove k... |
886 |
kobject_del(&k->kobj); |
78a2d906b Kobject: convert ... |
887 |
kobject_put(&k->kobj); |
1da177e4c Linux-2.6.12-rc2 |
888 |
} |
fa40ae344 kobject: move EXP... |
889 |
EXPORT_SYMBOL(kset_unregister); |
1da177e4c Linux-2.6.12-rc2 |
890 |
|
1da177e4c Linux-2.6.12-rc2 |
891 |
/** |
ed856349d kobject: Fix kern... |
892 |
* kset_find_obj() - Search for object in kset. |
e374a2bfe Kobject: fix codi... |
893 894 |
* @kset: kset we're looking in. * @name: object's name. |
1da177e4c Linux-2.6.12-rc2 |
895 |
* |
e374a2bfe Kobject: fix codi... |
896 897 898 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
899 |
*/ |
e374a2bfe Kobject: fix codi... |
900 |
struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4c Linux-2.6.12-rc2 |
901 |
{ |
c6a2a3dc2 Kobject: Replace ... |
902 |
struct kobject *k; |
e374a2bfe Kobject: fix codi... |
903 |
struct kobject *ret = NULL; |
1da177e4c Linux-2.6.12-rc2 |
904 905 |
spin_lock(&kset->list_lock); |
c25d1dfbd kobject: Introduc... |
906 |
|
c6a2a3dc2 Kobject: Replace ... |
907 |
list_for_each_entry(k, &kset->list, entry) { |
e374a2bfe Kobject: fix codi... |
908 |
if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
a49b7e82c kobject: fix kset... |
909 |
ret = kobject_get_unless_zero(k); |
1da177e4c Linux-2.6.12-rc2 |
910 911 912 |
break; } } |
c25d1dfbd kobject: Introduc... |
913 |
|
1da177e4c Linux-2.6.12-rc2 |
914 915 916 |
spin_unlock(&kset->list_lock); return ret; } |
2fe829aca kobject: export k... |
917 |
EXPORT_SYMBOL_GPL(kset_find_obj); |
1da177e4c Linux-2.6.12-rc2 |
918 |
|
b727c7028 kset: add kset_cr... |
919 920 921 |
static void kset_release(struct kobject *kobj) { struct kset *kset = container_of(kobj, struct kset, kobj); |
9f66fa2a4 kobject: clean up... |
922 923 |
pr_debug("kobject: '%s' (%p): %s ", |
810304db7 lib: replace rema... |
924 |
kobject_name(kobj), kobj, __func__); |
b727c7028 kset: add kset_cr... |
925 926 |
kfree(kset); } |
7ab35a14d kobject: make kse... |
927 |
static void kset_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
d028b6f70 kobject: kset_cre... |
928 929 930 931 |
{ if (kobj->parent) kobject_get_ownership(kobj->parent, uid, gid); } |
386f275f5 Driver Core: swit... |
932 933 |
static struct kobj_type kset_ktype = { .sysfs_ops = &kobj_sysfs_ops, |
d028b6f70 kobject: kset_cre... |
934 935 |
.release = kset_release, .get_ownership = kset_get_ownership, |
b727c7028 kset: add kset_cr... |
936 937 938 |
}; /** |
ed856349d kobject: Fix kern... |
939 |
* kset_create() - Create a struct kset dynamically. |
b727c7028 kset: add kset_cr... |
940 941 942 943 944 945 946 947 948 949 950 951 952 953 |
* * @name: the name for the kset * @uevent_ops: a struct kset_uevent_ops for the kset * @parent_kobj: the parent kobject of this kset, if any. * * This function creates a kset structure dynamically. This structure can * then be registered with the system and show up in sysfs with a call to * kset_register(). When you are finished with this structure, if * kset_register() has been called, call kset_unregister() and the * structure will be dynamically freed when it is no longer being used. * * If the kset was not able to be created, NULL will be returned. */ static struct kset *kset_create(const char *name, |
9cd43611c kobject: Constify... |
954 |
const struct kset_uevent_ops *uevent_ops, |
b727c7028 kset: add kset_cr... |
955 956 957 |
struct kobject *parent_kobj) { struct kset *kset; |
d9cd8f378 kobject: make kse... |
958 |
int retval; |
b727c7028 kset: add kset_cr... |
959 960 961 962 |
kset = kzalloc(sizeof(*kset), GFP_KERNEL); if (!kset) return NULL; |
b7165ebbf kobject: sanitize... |
963 |
retval = kobject_set_name(&kset->kobj, "%s", name); |
d9cd8f378 kobject: make kse... |
964 965 966 967 |
if (retval) { kfree(kset); return NULL; } |
b727c7028 kset: add kset_cr... |
968 969 970 971 |
kset->uevent_ops = uevent_ops; kset->kobj.parent = parent_kobj; /* |
386f275f5 Driver Core: swit... |
972 |
* The kobject of this kset will have a type of kset_ktype and belong to |
b727c7028 kset: add kset_cr... |
973 974 975 |
* no kset itself. That way we can properly free it when it is * finished being used. */ |
386f275f5 Driver Core: swit... |
976 |
kset->kobj.ktype = &kset_ktype; |
b727c7028 kset: add kset_cr... |
977 978 979 980 981 982 |
kset->kobj.kset = NULL; return kset; } /** |
ed856349d kobject: Fix kern... |
983 |
* kset_create_and_add() - Create a struct kset dynamically and add it to sysfs. |
b727c7028 kset: add kset_cr... |
984 985 986 987 988 989 990 991 992 993 994 995 996 |
* * @name: the name for the kset * @uevent_ops: a struct kset_uevent_ops for the kset * @parent_kobj: the parent kobject of this kset, if any. * * This function creates a kset structure dynamically and registers it * with sysfs. When you are finished with this structure, call * kset_unregister() and the structure will be dynamically freed when it * is no longer being used. * * If the kset was not able to be created, NULL will be returned. */ struct kset *kset_create_and_add(const char *name, |
9cd43611c kobject: Constify... |
997 |
const struct kset_uevent_ops *uevent_ops, |
b727c7028 kset: add kset_cr... |
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 |
struct kobject *parent_kobj) { struct kset *kset; int error; kset = kset_create(name, uevent_ops, parent_kobj); if (!kset) return NULL; error = kset_register(kset); if (error) { kfree(kset); return NULL; } return kset; } EXPORT_SYMBOL_GPL(kset_create_and_add); |
bc451f205 kobj: Add basic i... |
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 |
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; |
41fb96a4b kobject: fix NULL... |
1060 |
if (parent && parent->ktype && parent->ktype->child_ns_type) |
bc451f205 kobj: Add basic i... |
1061 1062 1063 1064 1065 1066 1067 1068 1069 |
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); } |
7dc5dbc87 sysfs: Restrict m... |
1070 1071 |
bool kobj_ns_current_may_mount(enum kobj_ns_type type) { |
730d7d339 sysfs: Allow moun... |
1072 |
bool may_mount = true; |
7dc5dbc87 sysfs: Restrict m... |
1073 1074 1075 1076 1077 1078 1079 1080 1081 |
spin_lock(&kobj_ns_type_lock); if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && kobj_ns_ops_tbl[type]) may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); spin_unlock(&kobj_ns_type_lock); return may_mount; } |
bc451f205 kobj: Add basic i... |
1082 |
|
a685e0898 Delay struct net ... |
1083 |
void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f205 kobj: Add basic i... |
1084 |
{ |
a685e0898 Delay struct net ... |
1085 |
void *ns = NULL; |
bc451f205 kobj: Add basic i... |
1086 1087 1088 1089 |
spin_lock(&kobj_ns_type_lock); if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && kobj_ns_ops_tbl[type]) |
a685e0898 Delay struct net ... |
1090 |
ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f205 kobj: Add basic i... |
1091 1092 1093 1094 |
spin_unlock(&kobj_ns_type_lock); return ns; } |
172856eac kobject: Export k... |
1095 |
EXPORT_SYMBOL_GPL(kobj_ns_grab_current); |
bc451f205 kobj: Add basic i... |
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 |
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; } |
a685e0898 Delay struct net ... |
1122 |
void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f205 kobj: Add basic i... |
1123 |
{ |
a685e0898 Delay struct net ... |
1124 1125 1126 1127 1128 |
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); |
bc451f205 kobj: Add basic i... |
1129 |
} |
172856eac kobject: Export k... |
1130 |
EXPORT_SYMBOL_GPL(kobj_ns_drop); |