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lib/kobject.c
24.1 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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|
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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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{ int error = 0; if (kobject_name(kobj)) { |
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error = sysfs_create_dir(kobj); |
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if (!error) { |
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error = populate_dir(kobj); if (error) |
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sysfs_remove_dir(kobj); } } return error; } |
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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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strncpy(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 - 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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|
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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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|
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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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|
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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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|
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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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|
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if (!kobj->name || !kobj->name[0]) { |
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WARN(1, "kobject: (%p): attempted to be registered with empty " |
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"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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|
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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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|
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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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printk(KERN_ERR "%s failed for %s with " |
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"-EEXIST, don't try to register things with " "the same name in the same directory. ", |
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__func__, kobject_name(kobj)); |
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else |
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printk(KERN_ERR "%s failed for %s (%d) ", |
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__func__, kobject_name(kobj), error); |
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dump_stack(); |
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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 an kobject * @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 *old_name = kobj->name; char *s; |
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|
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if (kobj->name && !fmt) return 0; |
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kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs); if (!kobj->name) return -ENOMEM; |
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|
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/* ewww... some of these buggers have '/' in the name ... */ |
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while ((s = strchr(kobj->name, '/'))) |
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s[0] = '!'; kfree(old_name); |
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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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printk(KERN_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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printk(KERN_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 int kobject_add_varg(struct kobject *kobj, struct kobject *parent, const char *fmt, va_list vargs) { |
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int retval; |
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retval = kobject_set_name_vargs(kobj, fmt, vargs); |
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if (retval) { printk(KERN_ERR "kobject: can not set name properly! "); 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 * kobject associted with the kset assigned to this kobject. If no kset * is assigned to the kobject, then the kobject will be located in the * root of the sysfs tree. * * If this function returns an error, kobject_put() must be called to * properly clean up the memory associated with the object. |
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* 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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* 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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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) { printk(KERN_ERR "kobject '%s' (%p): tried to add an " "uninitialized object, something is seriously wrong. ", kobject_name(kobj), kobj); dump_stack(); return -EINVAL; } |
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va_start(args, fmt); retval = kobject_add_varg(kobj, parent, fmt, args); va_end(args); return retval; } |
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EXPORT_SYMBOL(kobject_add); |
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|
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/** |
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* kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy * @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. * |
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* This function combines the call to kobject_init() and |
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* kobject_add(). The same type of error handling after a call to * kobject_add() and kobject lifetime rules are the same here. |
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*/ int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, struct kobject *parent, const char *fmt, ...) { va_list args; int retval; |
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kobject_init(kobj, ktype); |
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va_start(args, fmt); retval = kobject_add_varg(kobj, parent, fmt, args); va_end(args); return retval; } EXPORT_SYMBOL_GPL(kobject_init_and_add); /** |
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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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* * 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. |
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*/ |
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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; |
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const char *dup_name = NULL, *name; |
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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; |
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|
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name = dup_name = kstrdup(new_name, GFP_KERNEL); if (!name) { error = -ENOMEM; goto out; } |
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error = sysfs_rename_dir(kobj, new_name); |
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if (error) goto out; /* Install the new kobject name */ dup_name = kobj->name; kobj->name = 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. */ |
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kobject_uevent_env(kobj, KOBJ_MOVE, envp); |
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out: |
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444 |
kfree(dup_name); |
ca2f37dbc Driver core: noti... |
445 446 |
kfree(devpath_string); kfree(devpath); |
b592fcfe7 sysfs: Shadow dir... |
447 448 449 450 |
kobject_put(kobj); return error; } |
8344b568f PCI: ACPI PCI slo... |
451 |
EXPORT_SYMBOL_GPL(kobject_rename); |
b592fcfe7 sysfs: Shadow dir... |
452 453 |
/** |
e374a2bfe Kobject: fix codi... |
454 455 456 |
* kobject_move - move object to another parent * @kobj: object in question. * @new_parent: object's new parent (can be NULL) |
8a82472f8 driver core: Intr... |
457 |
*/ |
8a82472f8 driver core: Intr... |
458 459 460 461 462 463 464 465 466 467 468 469 470 |
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... |
471 472 |
if (kobj->kset) new_parent = kobject_get(&kobj->kset->kobj); |
8a82472f8 driver core: Intr... |
473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 |
} /* 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; |
9e993efb0 kobject: new_devi... |
493 |
new_parent = NULL; |
8a82472f8 driver core: Intr... |
494 495 496 |
kobject_put(old_parent); kobject_uevent_env(kobj, KOBJ_MOVE, envp); out: |
9e993efb0 kobject: new_devi... |
497 |
kobject_put(new_parent); |
8a82472f8 driver core: Intr... |
498 499 500 501 502 503 504 |
kobject_put(kobj); kfree(devpath_string); kfree(devpath); return error; } /** |
e374a2bfe Kobject: fix codi... |
505 506 |
* kobject_del - unlink kobject from hierarchy. * @kobj: object. |
1da177e4c Linux-2.6.12-rc2 |
507 |
*/ |
e374a2bfe Kobject: fix codi... |
508 |
void kobject_del(struct kobject *kobj) |
1da177e4c Linux-2.6.12-rc2 |
509 |
{ |
31b9025aa Kobject: make kob... |
510 511 |
if (!kobj) return; |
0f4dafc05 Kobject: auto-cle... |
512 |
|
1da177e4c Linux-2.6.12-rc2 |
513 |
sysfs_remove_dir(kobj); |
0f4dafc05 Kobject: auto-cle... |
514 515 516 517 |
kobj->state_in_sysfs = 0; kobj_kset_leave(kobj); kobject_put(kobj->parent); kobj->parent = NULL; |
1da177e4c Linux-2.6.12-rc2 |
518 519 520 |
} /** |
e374a2bfe Kobject: fix codi... |
521 522 |
* kobject_get - increment refcount for object. * @kobj: object. |
1da177e4c Linux-2.6.12-rc2 |
523 |
*/ |
e374a2bfe Kobject: fix codi... |
524 |
struct kobject *kobject_get(struct kobject *kobj) |
1da177e4c Linux-2.6.12-rc2 |
525 526 527 528 529 |
{ if (kobj) kref_get(&kobj->kref); return kobj; } |
18041f477 kobject: make kob... |
530 531 532 |
/* * kobject_cleanup - free kobject resources. * @kobj: object to cleanup |
1da177e4c Linux-2.6.12-rc2 |
533 |
*/ |
18041f477 kobject: make kob... |
534 |
static void kobject_cleanup(struct kobject *kobj) |
1da177e4c Linux-2.6.12-rc2 |
535 |
{ |
0f4dafc05 Kobject: auto-cle... |
536 |
struct kobj_type *t = get_ktype(kobj); |
af5ca3f4e Driver core: chan... |
537 |
const char *name = kobj->name; |
1da177e4c Linux-2.6.12-rc2 |
538 |
|
9f66fa2a4 kobject: clean up... |
539 540 |
pr_debug("kobject: '%s' (%p): %s ", |
810304db7 lib: replace rema... |
541 |
kobject_name(kobj), kobj, __func__); |
0f4dafc05 Kobject: auto-cle... |
542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 |
if (t && !t->release) pr_debug("kobject: '%s' (%p): does not have a release() " "function, it is broken and must be fixed. ", 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); kobject_del(kobj); } |
ce2c9cb02 kobject: remove t... |
564 |
if (t && t->release) { |
0f4dafc05 Kobject: auto-cle... |
565 566 567 |
pr_debug("kobject: '%s' (%p): calling ktype release ", kobject_name(kobj), kobj); |
1da177e4c Linux-2.6.12-rc2 |
568 |
t->release(kobj); |
0f4dafc05 Kobject: auto-cle... |
569 570 571 |
} /* free name if we allocated it */ |
af5ca3f4e Driver core: chan... |
572 |
if (name) { |
0f4dafc05 Kobject: auto-cle... |
573 574 |
pr_debug("kobject: '%s': free name ", name); |
ce2c9cb02 kobject: remove t... |
575 576 |
kfree(name); } |
1da177e4c Linux-2.6.12-rc2 |
577 578 579 580 581 582 583 584 |
} static void kobject_release(struct kref *kref) { kobject_cleanup(container_of(kref, struct kobject, kref)); } /** |
e374a2bfe Kobject: fix codi... |
585 586 |
* kobject_put - decrement refcount for object. * @kobj: object. |
1da177e4c Linux-2.6.12-rc2 |
587 |
* |
e374a2bfe Kobject: fix codi... |
588 |
* Decrement the refcount, and if 0, call kobject_cleanup(). |
1da177e4c Linux-2.6.12-rc2 |
589 |
*/ |
e374a2bfe Kobject: fix codi... |
590 |
void kobject_put(struct kobject *kobj) |
1da177e4c Linux-2.6.12-rc2 |
591 |
{ |
c1ebdae51 kobject: catch ko... |
592 |
if (kobj) { |
d955c78ac Example use of WA... |
593 594 |
if (!kobj->state_initialized) WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " |
c1ebdae51 kobject: catch ko... |
595 596 597 |
"initialized, yet kobject_put() is being " "called. ", kobject_name(kobj), kobj); |
1da177e4c Linux-2.6.12-rc2 |
598 |
kref_put(&kobj->kref, kobject_release); |
c1ebdae51 kobject: catch ko... |
599 |
} |
1da177e4c Linux-2.6.12-rc2 |
600 |
} |
3f9e3ee9d kobject: add kobj... |
601 |
static void dynamic_kobj_release(struct kobject *kobj) |
7423172a5 [PATCH] kobject_a... |
602 |
{ |
810304db7 lib: replace rema... |
603 604 |
pr_debug("kobject: (%p): %s ", kobj, __func__); |
7423172a5 [PATCH] kobject_a... |
605 606 |
kfree(kobj); } |
3f9e3ee9d kobject: add kobj... |
607 |
static struct kobj_type dynamic_kobj_ktype = { |
386f275f5 Driver Core: swit... |
608 609 |
.release = dynamic_kobj_release, .sysfs_ops = &kobj_sysfs_ops, |
7423172a5 [PATCH] kobject_a... |
610 |
}; |
43968d2f1 kobject: get rid ... |
611 |
/** |
3f9e3ee9d kobject: add kobj... |
612 613 614 615 616 617 |
* kobject_create - create a struct kobject dynamically * * 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 ... |
618 |
* The kobject structure returned from here must be cleaned up with a |
f9cb074bf Kobject: rename k... |
619 |
* call to kobject_put() and not kfree(), as kobject_init() has |
43968d2f1 kobject: get rid ... |
620 |
* already been called on this structure. |
3f9e3ee9d kobject: add kobj... |
621 |
*/ |
43968d2f1 kobject: get rid ... |
622 |
struct kobject *kobject_create(void) |
3f9e3ee9d kobject: add kobj... |
623 624 625 626 627 628 |
{ struct kobject *kobj; kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); if (!kobj) return NULL; |
f9cb074bf Kobject: rename k... |
629 |
kobject_init(kobj, &dynamic_kobj_ktype); |
3f9e3ee9d kobject: add kobj... |
630 631 632 633 634 635 636 637 638 |
return kobj; } /** * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs * * @name: the name for the kset * @parent: the parent kobject of this kobject, if any. * |
f70701a34 kobject: kerneldo... |
639 |
* This function creates a kobject structure dynamically and registers it |
3f9e3ee9d kobject: add kobj... |
640 |
* with sysfs. When you are finished with this structure, call |
78a2d906b Kobject: convert ... |
641 |
* kobject_put() and the structure will be dynamically freed when |
3f9e3ee9d kobject: add kobj... |
642 643 644 645 646 647 648 649 650 651 652 653 |
* 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... |
654 |
retval = kobject_add(kobj, parent, "%s", name); |
3f9e3ee9d kobject: add kobj... |
655 656 657 |
if (retval) { printk(KERN_WARNING "%s: kobject_add error: %d ", |
810304db7 lib: replace rema... |
658 |
__func__, retval); |
3f9e3ee9d kobject: add kobj... |
659 660 661 662 663 664 |
kobject_put(kobj); kobj = NULL; } return kobj; } EXPORT_SYMBOL_GPL(kobject_create_and_add); |
7423172a5 [PATCH] kobject_a... |
665 |
/** |
e374a2bfe Kobject: fix codi... |
666 667 |
* kset_init - initialize a kset for use * @k: kset |
1da177e4c Linux-2.6.12-rc2 |
668 |
*/ |
e374a2bfe Kobject: fix codi... |
669 |
void kset_init(struct kset *k) |
1da177e4c Linux-2.6.12-rc2 |
670 |
{ |
e1543ddf7 Kobject: remove k... |
671 |
kobject_init_internal(&k->kobj); |
1da177e4c Linux-2.6.12-rc2 |
672 673 674 |
INIT_LIST_HEAD(&k->list); spin_lock_init(&k->list_lock); } |
23b5212cc Driver Core: add ... |
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 |
/* 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... |
699 |
const struct sysfs_ops kobj_sysfs_ops = { |
23b5212cc Driver Core: add ... |
700 701 702 |
.show = kobj_attr_show, .store = kobj_attr_store, }; |
1da177e4c Linux-2.6.12-rc2 |
703 704 |
/** |
e374a2bfe Kobject: fix codi... |
705 706 |
* kset_register - initialize and add a kset. * @k: kset. |
1da177e4c Linux-2.6.12-rc2 |
707 |
*/ |
e374a2bfe Kobject: fix codi... |
708 |
int kset_register(struct kset *k) |
1da177e4c Linux-2.6.12-rc2 |
709 |
{ |
80f03e349 Driver core: add ... |
710 |
int err; |
31b9025aa Kobject: make kob... |
711 712 |
if (!k) return -EINVAL; |
80f03e349 Driver core: add ... |
713 |
|
1da177e4c Linux-2.6.12-rc2 |
714 |
kset_init(k); |
12e339ac6 Kset: remove kset... |
715 |
err = kobject_add_internal(&k->kobj); |
80f03e349 Driver core: add ... |
716 717 718 719 |
if (err) return err; kobject_uevent(&k->kobj, KOBJ_ADD); return 0; |
1da177e4c Linux-2.6.12-rc2 |
720 |
} |
1da177e4c Linux-2.6.12-rc2 |
721 |
/** |
e374a2bfe Kobject: fix codi... |
722 723 |
* kset_unregister - remove a kset. * @k: kset. |
1da177e4c Linux-2.6.12-rc2 |
724 |
*/ |
e374a2bfe Kobject: fix codi... |
725 |
void kset_unregister(struct kset *k) |
1da177e4c Linux-2.6.12-rc2 |
726 |
{ |
31b9025aa Kobject: make kob... |
727 728 |
if (!k) return; |
78a2d906b Kobject: convert ... |
729 |
kobject_put(&k->kobj); |
1da177e4c Linux-2.6.12-rc2 |
730 |
} |
1da177e4c Linux-2.6.12-rc2 |
731 |
/** |
e374a2bfe Kobject: fix codi... |
732 733 734 |
* kset_find_obj - search for object in kset. * @kset: kset we're looking in. * @name: object's name. |
1da177e4c Linux-2.6.12-rc2 |
735 |
* |
e374a2bfe Kobject: fix codi... |
736 737 738 |
* 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 |
739 |
*/ |
e374a2bfe Kobject: fix codi... |
740 |
struct kobject *kset_find_obj(struct kset *kset, const char *name) |
1da177e4c Linux-2.6.12-rc2 |
741 |
{ |
c25d1dfbd kobject: Introduc... |
742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 |
return kset_find_obj_hinted(kset, name, NULL); } /** * kset_find_obj_hinted - search for object in kset given a predecessor hint. * @kset: kset we're looking in. * @name: object's name. * @hint: hint to possible object's predecessor. * * Check the hint's next object and if it is a match return it directly, * otherwise, fall back to the behavior of kset_find_obj(). Either way * a reference for the returned object is held and the reference on the * hinted object is released. */ struct kobject *kset_find_obj_hinted(struct kset *kset, const char *name, struct kobject *hint) { |
c6a2a3dc2 Kobject: Replace ... |
759 |
struct kobject *k; |
e374a2bfe Kobject: fix codi... |
760 |
struct kobject *ret = NULL; |
1da177e4c Linux-2.6.12-rc2 |
761 762 |
spin_lock(&kset->list_lock); |
c25d1dfbd kobject: Introduc... |
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 |
if (!hint) goto slow_search; /* end of list detection */ if (hint->entry.next == kset->list.next) goto slow_search; k = container_of(hint->entry.next, struct kobject, entry); if (!kobject_name(k) || strcmp(kobject_name(k), name)) goto slow_search; ret = kobject_get(k); goto unlock_exit; slow_search: |
c6a2a3dc2 Kobject: Replace ... |
779 |
list_for_each_entry(k, &kset->list, entry) { |
e374a2bfe Kobject: fix codi... |
780 |
if (kobject_name(k) && !strcmp(kobject_name(k), name)) { |
1da177e4c Linux-2.6.12-rc2 |
781 782 783 784 |
ret = kobject_get(k); break; } } |
c25d1dfbd kobject: Introduc... |
785 786 |
unlock_exit: |
1da177e4c Linux-2.6.12-rc2 |
787 |
spin_unlock(&kset->list_lock); |
c25d1dfbd kobject: Introduc... |
788 789 790 |
if (hint) kobject_put(hint); |
1da177e4c Linux-2.6.12-rc2 |
791 792 |
return ret; } |
b727c7028 kset: add kset_cr... |
793 794 795 |
static void kset_release(struct kobject *kobj) { struct kset *kset = container_of(kobj, struct kset, kobj); |
9f66fa2a4 kobject: clean up... |
796 797 |
pr_debug("kobject: '%s' (%p): %s ", |
810304db7 lib: replace rema... |
798 |
kobject_name(kobj), kobj, __func__); |
b727c7028 kset: add kset_cr... |
799 800 |
kfree(kset); } |
386f275f5 Driver Core: swit... |
801 802 |
static struct kobj_type kset_ktype = { .sysfs_ops = &kobj_sysfs_ops, |
b727c7028 kset: add kset_cr... |
803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 |
.release = kset_release, }; /** * kset_create - create a struct kset dynamically * * @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... |
822 |
const struct kset_uevent_ops *uevent_ops, |
b727c7028 kset: add kset_cr... |
823 824 825 |
struct kobject *parent_kobj) { struct kset *kset; |
d9cd8f378 kobject: make kse... |
826 |
int retval; |
b727c7028 kset: add kset_cr... |
827 828 829 830 |
kset = kzalloc(sizeof(*kset), GFP_KERNEL); if (!kset) return NULL; |
d9cd8f378 kobject: make kse... |
831 832 833 834 835 |
retval = kobject_set_name(&kset->kobj, name); if (retval) { kfree(kset); return NULL; } |
b727c7028 kset: add kset_cr... |
836 837 838 839 |
kset->uevent_ops = uevent_ops; kset->kobj.parent = parent_kobj; /* |
386f275f5 Driver Core: swit... |
840 |
* The kobject of this kset will have a type of kset_ktype and belong to |
b727c7028 kset: add kset_cr... |
841 842 843 |
* no kset itself. That way we can properly free it when it is * finished being used. */ |
386f275f5 Driver Core: swit... |
844 |
kset->kobj.ktype = &kset_ktype; |
b727c7028 kset: add kset_cr... |
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 |
kset->kobj.kset = NULL; return kset; } /** * kset_create_and_add - create a struct kset dynamically and add it to sysfs * * @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... |
865 |
const struct kset_uevent_ops *uevent_ops, |
b727c7028 kset: add kset_cr... |
866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 |
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... |
882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 |
static DEFINE_SPINLOCK(kobj_ns_type_lock); static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES]; int kobj_ns_type_register(const struct kobj_ns_type_operations *ops) { enum kobj_ns_type type = ops->type; int error; spin_lock(&kobj_ns_type_lock); error = -EINVAL; if (type >= KOBJ_NS_TYPES) goto out; error = -EINVAL; if (type <= KOBJ_NS_TYPE_NONE) goto out; error = -EBUSY; if (kobj_ns_ops_tbl[type]) goto out; error = 0; kobj_ns_ops_tbl[type] = ops; out: spin_unlock(&kobj_ns_type_lock); return error; } int kobj_ns_type_registered(enum kobj_ns_type type) { int registered = 0; spin_lock(&kobj_ns_type_lock); if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES)) registered = kobj_ns_ops_tbl[type] != NULL; spin_unlock(&kobj_ns_type_lock); return registered; } const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent) { const struct kobj_ns_type_operations *ops = NULL; if (parent && parent->ktype->child_ns_type) ops = parent->ktype->child_ns_type(parent); return ops; } const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) { return kobj_child_ns_ops(kobj->parent); } |
a685e0898 Delay struct net ... |
939 |
void *kobj_ns_grab_current(enum kobj_ns_type type) |
bc451f205 kobj: Add basic i... |
940 |
{ |
a685e0898 Delay struct net ... |
941 |
void *ns = NULL; |
bc451f205 kobj: Add basic i... |
942 943 944 945 |
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 ... |
946 |
ns = kobj_ns_ops_tbl[type]->grab_current_ns(); |
bc451f205 kobj: Add basic i... |
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 |
spin_unlock(&kobj_ns_type_lock); return ns; } const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk) { const void *ns = NULL; spin_lock(&kobj_ns_type_lock); if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && kobj_ns_ops_tbl[type]) ns = kobj_ns_ops_tbl[type]->netlink_ns(sk); spin_unlock(&kobj_ns_type_lock); return ns; } const void *kobj_ns_initial(enum kobj_ns_type type) { const void *ns = NULL; spin_lock(&kobj_ns_type_lock); if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && kobj_ns_ops_tbl[type]) ns = kobj_ns_ops_tbl[type]->initial_ns(); spin_unlock(&kobj_ns_type_lock); return ns; } |
a685e0898 Delay struct net ... |
977 |
void kobj_ns_drop(enum kobj_ns_type type, void *ns) |
bc451f205 kobj: Add basic i... |
978 |
{ |
a685e0898 Delay struct net ... |
979 980 981 982 983 |
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... |
984 |
} |
1da177e4c Linux-2.6.12-rc2 |
985 986 |
EXPORT_SYMBOL(kobject_get); EXPORT_SYMBOL(kobject_put); |
1da177e4c Linux-2.6.12-rc2 |
987 988 989 990 |
EXPORT_SYMBOL(kobject_del); EXPORT_SYMBOL(kset_register); EXPORT_SYMBOL(kset_unregister); |