cregit-Linux how code gets into the kernel

Release 4.15 lib/kobject.c

Directory: lib
/*
 * kobject.c - library routines for handling generic kernel objects
 *
 * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
 * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (c) 2006-2007 Novell Inc.
 *
 * This file is released under the GPLv2.
 *
 *
 * Please see the file Documentation/kobject.txt for critical information
 * about using the kobject interface.
 */

#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/random.h>

/**
 * kobject_namespace - return @kobj's namespace tag
 * @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; return kobj->ktype->namespace(kobj); }

Contributors

PersonTokensPropCommitsCommitProp
Tejun Heo4697.87%150.00%
Linus Torvalds12.13%150.00%
Total47100.00%2100.00%

/* * populate_dir - populate directory with attributes. * @kobj: object we're working on. * * Most subsystems have a set of default attributes that are associated * with an object that registers with them. This is a helper called during * object registration that loops through the default attributes of the * subsystem and creates attributes files for them in sysfs. */
static int populate_dir(struct kobject *kobj) { struct kobj_type *t = get_ktype(kobj); struct attribute *attr; int error = 0; int i; if (t && t->default_attrs) { for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) { error = sysfs_create_file(kobj, attr); if (error) break; } } return error; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel5767.06%457.14%
Greg Kroah-Hartman2630.59%228.57%
Mika Kukkonen22.35%114.29%
Total85100.00%7100.00%


static int create_dir(struct kobject *kobj) { const struct kobj_ns_type_operations *ops; int error; error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); if (error) return error; error = populate_dir(kobj); if (error) { sysfs_remove_dir(kobj); return error; } /* * @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); /* * 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)); sysfs_enable_ns(kobj->sd); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tejun Heo7864.46%466.67%
Greg Kroah-Hartman4335.54%233.33%
Total121100.00%6100.00%


static int get_kobj_path_length(struct kobject *kobj) { int length = 1; struct kobject *parent = kobj; /* walk up the ancestors until we hit the one pointing to the * root. * Add 1 to strlen for leading '/' of each level. */ do { if (kobject_name(parent) == NULL) return 0; length += strlen(kobject_name(parent)) + 1; parent = parent->parent; } while (parent); return length; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman5076.92%250.00%
Chuck Ebbert1218.46%125.00%
Patrick Mochel34.62%125.00%
Total65100.00%4100.00%


static void fill_kobj_path(struct kobject *kobj, char *path, int length) { struct kobject *parent; --length; for (parent = kobj; parent; parent = parent->parent) { int cur = strlen(kobject_name(parent)); /* back up enough to print this name with '/' */ length -= cur; strncpy(path + length, kobject_name(parent), cur); *(path + --length) = '/'; } pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj), kobj, __func__, path); }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman9192.86%250.00%
Patrick Mochel66.12%125.00%
Harvey Harrison11.02%125.00%
Total98100.00%4100.00%

/** * kobject_get_path - generate and return the path associated with a given kobj and kset pair. * * @kobj: kobject in question, with which to build the path * @gfp_mask: the allocation type used to allocate the path * * The result must be freed by the caller with kfree(). */
char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask) { char *path; int len; len = get_kobj_path_length(kobj); if (len == 0) return NULL; path = kzalloc(len, gfp_mask); if (!path) return NULL; fill_kobj_path(kobj, path, len); return path; }

Contributors

PersonTokensPropCommitsCommitProp
Robert Love5583.33%125.00%
Chuck Ebbert913.64%125.00%
Burman Yan11.52%125.00%
Al Viro11.52%125.00%
Total66100.00%4100.00%

EXPORT_SYMBOL_GPL(kobject_get_path); /* add the kobject to its kset's list */
static void kobj_kset_join(struct kobject *kobj) { if (!kobj->kset) return; kset_get(kobj->kset); spin_lock(&kobj->kset->list_lock); list_add_tail(&kobj->entry, &kobj->kset->list); spin_unlock(&kobj->kset->list_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers3252.46%125.00%
Patrick Mochel2236.07%125.00%
Greg Kroah-Hartman711.48%250.00%
Total61100.00%4100.00%

/* remove the kobject from its kset's list */
static void kobj_kset_leave(struct kobject *kobj) { if (!kobj->kset) return; spin_lock(&kobj->kset->list_lock); list_del_init(&kobj->entry); spin_unlock(&kobj->kset->list_lock); kset_put(kobj->kset); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel3972.22%125.00%
Kay Sievers814.81%125.00%
Greg Kroah-Hartman47.41%125.00%
Alan Stern35.56%125.00%
Total54100.00%4100.00%


static void kobject_init_internal(struct kobject *kobj) { if (!kobj) return; kref_init(&kobj->kref); INIT_LIST_HEAD(&kobj->entry); kobj->state_in_sysfs = 0; kobj->state_add_uevent_sent = 0; kobj->state_remove_uevent_sent = 0; kobj->state_initialized = 1; }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers2543.86%125.00%
Greg Kroah-Hartman2442.11%125.00%
Patrick Mochel58.77%125.00%
Alan Stern35.26%125.00%
Total57100.00%4100.00%


static int kobject_add_internal(struct kobject *kobj) { int error = 0; struct kobject *parent; if (!kobj) return -ENOENT; if (!kobj->name || !kobj->name[0]) { WARN(1, "kobject: (%p): attempted to be registered with empty " "name!\n", kobj); return -EINVAL; } parent = kobject_get(kobj->parent); /* join kset if set, use it as parent if we do not already have one */ if (kobj->kset) { if (!parent) parent = kobject_get(&kobj->kset->kobj); kobj_kset_join(kobj); kobj->parent = parent; } pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n", kobject_name(kobj), kobj, __func__, parent ? kobject_name(parent) : "<NULL>", kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>"); error = create_dir(kobj); if (error) { kobj_kset_leave(kobj); kobject_put(parent); kobj->parent = NULL; /* be noisy on error issues */ if (error == -EEXIST) WARN(1, "%s failed for %s with " "-EEXIST, don't try to register things with " "the same name in the same directory.\n", __func__, kobject_name(kobj)); else WARN(1, "%s failed for %s (error: %d parent: %s)\n", __func__, kobject_name(kobj), error, parent ? kobject_name(parent) : "'none'"); } else kobj->state_in_sysfs = 1; return error; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel8937.87%834.78%
Greg Kroah-Hartman6728.51%1043.48%
Kay Sievers5724.26%28.70%
Dan J Williams166.81%14.35%
Harvey Harrison31.28%14.35%
Arjan van de Ven31.28%14.35%
Total235100.00%23100.00%

/** * 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. */
int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, va_list vargs) { const char *s; if (kobj->name && !fmt) return 0; s = kvasprintf_const(GFP_KERNEL, fmt, vargs); if (!s) return -ENOMEM; /* * 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); kobj->name = s; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Rasmus Villemoes6149.59%233.33%
Patrick Mochel2822.76%116.67%
Kay Sievers2419.51%233.33%
Greg Kroah-Hartman108.13%116.67%
Total123100.00%6100.00%

/** * kobject_set_name - Set the name of a kobject * @kobj: struct kobject to set the name of * @fmt: format string used to build the name * * This sets the name of the kobject. If you have already added the * kobject to the system, you must call kobject_rename() in order to * change the name of the kobject. */
int kobject_set_name(struct kobject *kobj, const char *fmt, ...) { va_list vargs; int retval; va_start(vargs, fmt); retval = kobject_set_name_vargs(kobj, fmt, vargs); va_end(vargs); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman2551.02%125.00%
Patrick Mochel1020.41%125.00%
Andrew Morton1020.41%125.00%
Kay Sievers48.16%125.00%
Total49100.00%4100.00%

EXPORT_SYMBOL(kobject_set_name); /** * kobject_init - initialize a kobject structure * @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. */
void kobject_init(struct kobject *kobj, struct kobj_type *ktype) { char *err_str; if (!kobj) { err_str = "invalid kobject pointer!"; goto error; } if (!ktype) { err_str = "must have a ktype to be initialized properly!\n"; goto error; } if (kobj->state_initialized) { /* do not error out as sometimes we can recover */ printk(KERN_ERR "kobject (%p): tried to init an initialized " "object, something is seriously wrong.\n", kobj); dump_stack(); } kobject_init_internal(kobj); kobj->ktype = ktype; return; error: printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str); dump_stack(); }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman8791.58%375.00%
Kay Sievers88.42%125.00%
Total95100.00%4100.00%

EXPORT_SYMBOL(kobject_init); static __printf(3, 0) int kobject_add_varg(struct kobject *kobj, struct kobject *parent, const char *fmt, va_list vargs) { int retval; retval = kobject_set_name_vargs(kobj, fmt, vargs); if (retval) { printk(KERN_ERR "kobject: can not set name properly!\n"); return retval; } kobj->parent = parent; return kobject_add_internal(kobj); } /** * kobject_add - the main kobject add function * @kobj: the kobject to add * @parent: pointer to the parent of the kobject. * @fmt: format to name the kobject with. * * 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 associated 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. * Under no instance should the kobject that is passed to this function * be directly freed with a call to kfree(), that can leak memory. * * Note, no "add" uevent will be created with this call, the caller should set * up all of the necessary sysfs files for the object and then call * kobject_uevent() with the UEVENT_ADD parameter to ensure that * userspace is properly notified of this kobject's creation. */ int kobject_add(struct kobject *kobj, struct kobject *parent, const char *fmt, ...) { va_list args; int retval; if (!kobj) return -EINVAL; if (!kobj->state_initialized) { printk(KERN_ERR "kobject '%s' (%p): tried to add an " "uninitialized object, something is seriously wrong.\n", kobject_name(kobj), kobj); dump_stack(); return -EINVAL; } va_start(args, fmt); retval = kobject_add_varg(kobj, parent, fmt, args); va_end(args); return retval; } EXPORT_SYMBOL(kobject_add); /** * 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. * * This function combines the call to kobject_init() and * kobject_add(). The same type of error handling after a call to * kobject_add() and kobject lifetime rules are the same here. */
int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, struct kobject *parent, const char *fmt, ...) { va_list args; int retval; kobject_init(kobj, ktype); va_start(args, fmt); retval = kobject_add_varg(kobj, parent, fmt, args); va_end(args); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman68100.00%2100.00%
Total68100.00%2100.00%

EXPORT_SYMBOL_GPL(kobject_init_and_add); /** * kobject_rename - change the name of an object * @kobj: object in question. * @new_name: object's new name * * It is the responsibility of the caller to provide mutual * exclusion between two different calls of kobject_rename * on the same kobject and to ensure that new_name is valid and * won't conflict with other kobjects. */
int kobject_rename(struct kobject *kobj, const char *new_name) { int error = 0; const char *devpath = NULL; const char *dup_name = NULL, *name; char *devpath_string = NULL; char *envp[2]; kobj = kobject_get(kobj); if (!kobj) return -EINVAL; if (!kobj->parent) return -EINVAL; devpath = kobject_get_path(kobj, GFP_KERNEL); if (!devpath) { error = -ENOMEM; goto out; } devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); if (!devpath_string) { error = -ENOMEM; goto out; } sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); envp[0] = devpath_string; envp[1] = NULL; name = dup_name = kstrdup_const(new_name, GFP_KERNEL); if (!name) { error = -ENOMEM; goto out; } error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj)); if (error) goto out; /* Install the new kobject name */ dup_name = kobj->name; kobj->name = name; /* This function is mostly/only used for network interface. * Some hotplug package track interfaces by their name and * therefore want to know when the name is changed by the user. */ kobject_uevent_env(kobj, KOBJ_MOVE, envp); out: kfree_const(dup_name); kfree(devpath_string); kfree(devpath); kobject_put(kobj); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Jean Tourrilhes12048.39%112.50%
Eric W. Biedermann8032.26%225.00%
Greg Kroah-Hartman2710.89%112.50%
Maneesh Soni124.84%112.50%
Tejun Heo62.42%112.50%
Rasmus Villemoes20.81%112.50%
Dmitry Torokhov10.40%112.50%
Total248100.00%8100.00%

EXPORT_SYMBOL_GPL(kobject_rename); /** * kobject_move - move object to another parent * @kobj: object in question. * @new_parent: object's new parent (can be NULL) */
int kobject_move(struct kobject *kobj, struct kobject *new_parent) { int error; struct kobject *old_parent; const char *devpath = NULL; char *devpath_string = NULL; char *envp[2]; kobj = kobject_get(kobj); if (!kobj) return -EINVAL; new_parent = kobject_get(new_parent); if (!new_parent) { if (kobj->kset) new_parent = kobject_get(&kobj->kset->kobj); } /* old object path */ devpath = kobject_get_path(kobj, GFP_KERNEL); if (!devpath) { error = -ENOMEM; goto out; } devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL); if (!devpath_string) { error = -ENOMEM; goto out; } sprintf(devpath_string, "DEVPATH_OLD=%s", devpath); envp[0] = devpath_string; envp[1] = NULL; error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj)); if (error) goto out; old_parent = kobj->parent; kobj->parent = new_parent; new_parent = NULL; kobject_put(old_parent); kobject_uevent_env(kobj, KOBJ_MOVE, envp); out: kobject_put(new_parent); kobject_put(kobj); kfree(devpath_string); kfree(devpath); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Cornelia Huck22993.85%250.00%
Dmitriy Monakhov93.69%125.00%
Tejun Heo62.46%125.00%
Total244100.00%4100.00%

EXPORT_SYMBOL_GPL(kobject_move); /** * kobject_del - unlink kobject from hierarchy. * @kobj: object. */
void kobject_del(struct kobject *kobj) { struct kernfs_node *sd; if (!kobj) return; sd = kobj->sd; sysfs_remove_dir(kobj); sysfs_put(sd); kobj->state_in_sysfs = 0; kobj_kset_leave(kobj); kobject_put(kobj->parent); kobj->parent = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers2032.79%114.29%
Patrick Mochel1931.15%342.86%
Tejun Heo1626.23%228.57%
Greg Kroah-Hartman69.84%114.29%
Total61100.00%7100.00%

EXPORT_SYMBOL(kobject_del); /** * kobject_get - increment refcount for object. * @kobj: object. */
struct kobject *kobject_get(struct kobject *kobj) { if (kobj) { if (!kobj->state_initialized) WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " "initialized, yet kobject_get() is being " "called.\n", kobject_name(kobj), kobj); kref_get(&kobj->kref); } return kobj; }

Contributors

PersonTokensPropCommitsCommitProp
Ethan Zhao2649.06%120.00%
Patrick Mochel2445.28%240.00%
Greg Kroah-Hartman35.66%240.00%
Total53100.00%5100.00%

EXPORT_SYMBOL(kobject_get);
struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj) { if (!kobj) return NULL; if (!kref_get_unless_zero(&kobj->kref)) kobj = NULL; return kobj; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds3076.92%133.33%
Jan Kara820.51%133.33%
Anatol Pomozov12.56%133.33%
Total39100.00%3100.00%

EXPORT_SYMBOL(kobject_get_unless_zero); /* * kobject_cleanup - free kobject resources. * @kobj: object to cleanup */
static void kobject_cleanup(struct kobject *kobj) { struct kobj_type *t = get_ktype(kobj); const char *name = kobj->name; pr_debug("kobject: '%s' (%p): %s, parent %p\n", kobject_name(kobj), kobj, __func__, kobj->parent); if (t && !t->release) pr_debug("kobject: '%s' (%p): does not have a release() " "function, it is broken and must be fixed.\n", kobject_name(kobj), kobj); /* send "remove" if the caller did not do it but sent "add" */ if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) { pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n", kobject_name(kobj), kobj); kobject_uevent(kobj, KOBJ_REMOVE); } /* remove from sysfs if the caller did not do it */ if (kobj->state_in_sysfs) { pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n", kobject_name(kobj), kobj); kobject_del(kobj); } if (t && t->release) { pr_debug("kobject: '%s' (%p): calling ktype release\n", kobject_name(kobj), kobj); t->release(kobj); } /* free name if we allocated it */ if (name) { pr_debug("kobject: '%s': free name\n", name); kfree_const(name); } }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers10458.76%214.29%
Patrick Mochel5028.25%642.86%
Greg Kroah-Hartman169.04%321.43%
Russell King52.82%17.14%
Harvey Harrison10.56%17.14%
Rasmus Villemoes10.56%17.14%
Total177100.00%14100.00%

#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)); }

Contributors

PersonTokensPropCommitsCommitProp
Russell King27100.00%1100.00%
Total27100.00%1100.00%

#endif
static void kobject_release(struct kref *kref) { struct kobject *kobj = container_of(kref, struct kobject, kref); #ifdef CONFIG_DEBUG_KOBJECT_RELEASE unsigned long delay = HZ + HZ * (get_random_int() & 0x3); pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n", kobject_name(kobj), kobj, __func__, kobj->parent, delay); INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup); schedule_delayed_work(&kobj->release, delay); #else kobject_cleanup(kobj); #endif }

Contributors

PersonTokensPropCommitsCommitProp
Russell King5154.84%125.00%
Greg Kroah-Hartman2223.66%125.00%
Björn Helgaas1920.43%125.00%
Fengguang Wu11.08%125.00%
Total93100.00%4100.00%

/** * kobject_put - decrement refcount for object. * @kobj: object. * * Decrement the refcount, and if 0, call kobject_cleanup(). */
void kobject_put(struct kobject *kobj) { if (kobj) { if (!kobj->state_initialized) WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " "initialized, yet kobject_put() is being " "called.\n", kobject_name(kobj), kobj); kref_put(&kobj->kref, kobject_release); } }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman2958.00%233.33%
Patrick Mochel1836.00%350.00%
Arjan van de Ven36.00%116.67%
Total50100.00%6100.00%

EXPORT_SYMBOL(kobject_put);
static void dynamic_kobj_release(struct kobject *kobj) { pr_debug("kobject: (%p): %s\n", kobj, __func__); kfree(kobj); }

Contributors

PersonTokensPropCommitsCommitProp
Jun'ichi Nomura1560.00%120.00%
Greg Kroah-Hartman832.00%240.00%
Kay Sievers14.00%120.00%
Harvey Harrison14.00%120.00%
Total25100.00%5100.00%

static struct kobj_type dynamic_kobj_ktype = { .release = dynamic_kobj_release, .sysfs_ops = &kobj_sysfs_ops, }; /** * 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. * The kobject structure returned from here must be cleaned up with a * call to kobject_put() and not kfree(), as kobject_init() has * already been called on this structure. */
struct kobject *kobject_create(void) { struct kobject *kobj; kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); if (!kobj) return NULL; kobject_init(kobj, &dynamic_kobj_ktype); return kobj; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman4495.65%266.67%
Jun'ichi Nomura24.35%133.33%
Total46100.00%3100.00%

/** * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs * * @name: the name for the kobject * @parent: the parent kobject of this kobject, if any. * * This function creates a kobject structure dynamically and registers it * with sysfs. When you are finished with this structure, call * kobject_put() and the structure will be dynamically freed when * it is no longer being used. * * If the kobject was not able to be created, NULL will be returned. */
struct kobject *kobject_create_and_add(const char *name, struct kobject *parent) { struct kobject *kobj; int retval; kobj = kobject_create(); if (!kobj) return NULL; retval = kobject_add(kobj, parent, "%s", name); if (retval) { printk(KERN_WARNING "%s: kobject_add error: %d\n", __func__, retval); kobject_put(kobj); kobj = NULL; } return kobj; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman7696.20%250.00%
Jun'ichi Nomura22.53%125.00%
Harvey Harrison11.27%125.00%
Total79100.00%4100.00%

EXPORT_SYMBOL_GPL(kobject_create_and_add); /** * kset_init - initialize a kset for use * @k: kset */
void kset_init(struct kset *k) { kobject_init_internal(&k->kobj); INIT_LIST_HEAD(&k->list); spin_lock_init(&k->list_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel2573.53%250.00%
Greg Kroah-Hartman926.47%250.00%
Total34100.00%4100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers65100.00%1100.00%
Total65100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers71100.00%1100.00%
Total71100.00%1100.00%

const struct sysfs_ops kobj_sysfs_ops = { .show = kobj_attr_show, .store = kobj_attr_store, }; EXPORT_SYMBOL_GPL(kobj_sysfs_ops); /** * kset_register - initialize and add a kset. * @k: kset. */
int kset_register(struct kset *k) { int err; if (!k) return -EINVAL; kset_init(k); err = kobject_add_internal(&k->kobj); if (err) return err; kobject_uevent(&k->kobj, KOBJ_ADD); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers2543.86%125.00%
Patrick Mochel1933.33%125.00%
Greg Kroah-Hartman1322.81%250.00%
Total57100.00%4100.00%

EXPORT_SYMBOL(kset_register); /** * kset_unregister - remove a kset. * @k: kset. */
void kset_unregister(struct kset *k) { if (!k) return; kobject_del(&k->kobj); kobject_put(&k->kobj); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel1753.12%125.00%
Björn Helgaas825.00%125.00%
Greg Kroah-Hartman721.88%250.00%
Total32100.00%4100.00%

EXPORT_SYMBOL(kset_unregister); /** * kset_find_obj - search for object in kset. * @kset: kset we're looking in. * @name: object's name. * * Lock kset via @kset->subsys, and iterate over @kset->list, * looking for a matching kobject. If matching object is found * take a reference and return the object. */
struct kobject *kset_find_obj(struct kset *kset, const char *name) { struct kobject *k; struct kobject *ret = NULL; spin_lock(&kset->list_lock); list_for_each_entry(k, &kset->list, entry) { if (kobject_name(k) && !strcmp(kobject_name(k), name)) { ret = kobject_get_unless_zero(k); break; } } spin_unlock(&kset->list_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel6879.07%337.50%
Greg Kroah-Hartman910.47%225.00%
Robert P. J. Day66.98%112.50%
Dmitry Torokhov22.33%112.50%
Linus Torvalds11.16%112.50%
Total86100.00%8100.00%

EXPORT_SYMBOL_GPL(kset_find_obj);
static void kset_release(struct kobject *kobj) { struct kset *kset = container_of(kobj, struct kset, kobj); pr_debug("kobject: '%s' (%p): %s\n", kobject_name(kobj), kobj, __func__); kfree(kset); }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman4497.78%266.67%
Harvey Harrison12.22%133.33%
Total45100.00%3100.00%

static struct kobj_type kset_ktype = { .sysfs_ops = &kobj_sysfs_ops, .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, const struct kset_uevent_ops *uevent_ops, struct kobject *parent_kobj) { struct kset *kset; int retval; kset = kzalloc(sizeof(*kset), GFP_KERNEL); if (!kset) return NULL; retval = kobject_set_name(&kset->kobj, "%s", name); if (retval) { kfree(kset); return NULL; } kset->uevent_ops = uevent_ops; kset->kobj.parent = parent_kobj; /* * The kobject of this kset will have a type of kset_ktype and belong to * no kset itself. That way we can properly free it when it is * finished being used. */ kset->kobj.ktype = &kset_ktype; kset->kobj.kset = NULL; return kset; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman9279.31%120.00%
Dave Young1916.38%120.00%
Kees Cook21.72%120.00%
Kay Sievers21.72%120.00%
Emese Revfy10.86%120.00%
Total116100.00%5100.00%

/** * 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, const struct kset_uevent_ops *uevent_ops, 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; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman7398.65%150.00%
Emese Revfy11.35%150.00%
Total74100.00%2100.00%

EXPORT_SYMBOL_GPL(kset_create_and_add); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann93100.00%1100.00%
Total93100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann52100.00%1100.00%
Total52100.00%1100.00%


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 && parent->ktype->child_ns_type) ops = parent->ktype->child_ns_type(parent); return ops; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann4591.84%150.00%
Pankaj Dubey48.16%150.00%
Total49100.00%2100.00%


const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) { return kobj_child_ns_ops(kobj->parent); }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann21100.00%1100.00%
Total21100.00%1100.00%


bool kobj_ns_current_may_mount(enum kobj_ns_type type) { bool may_mount = true; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann58100.00%2100.00%
Total58100.00%2100.00%


void *kobj_ns_grab_current(enum kobj_ns_type type) { void *ns = NULL; spin_lock(&kobj_ns_type_lock); if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && kobj_ns_ops_tbl[type]) ns = kobj_ns_ops_tbl[type]->grab_current_ns(); spin_unlock(&kobj_ns_type_lock); return ns; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann5896.67%150.00%
Al Viro23.33%150.00%
Total60100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann69100.00%1100.00%
Total69100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann62100.00%1100.00%
Total62100.00%1100.00%


void kobj_ns_drop(enum kobj_ns_type type, void *ns) { spin_lock(&kobj_ns_type_lock); if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns) kobj_ns_ops_tbl[type]->drop_ns(ns); spin_unlock(&kobj_ns_type_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro4472.13%133.33%
Eric W. Biedermann1727.87%266.67%
Total61100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman112629.47%3228.07%
Eric W. Biedermann57214.97%76.14%
Patrick Mochel51513.48%1412.28%
Kay Sievers50913.32%87.02%
Cornelia Huck2295.99%21.75%
Tejun Heo1534.00%54.39%
Jean Tourrilhes1203.14%10.88%
Russell King882.30%10.88%
Rasmus Villemoes641.67%21.75%
Robert Love551.44%10.88%
Al Viro471.23%21.75%
Linus Torvalds320.84%21.75%
Gabriel Somlo300.79%21.75%
Björn Helgaas300.79%21.75%
Nicolas Iooss280.73%10.88%
Jun'ichi Nomura270.71%10.88%
Ethan Zhao260.68%10.88%
Chuck Ebbert210.55%10.88%
Dave Young190.50%10.88%
Dan J Williams160.42%10.88%
Jan Kara130.34%10.88%
Maneesh Soni120.31%10.88%
Andrew Morton100.26%10.88%
Dmitriy Monakhov90.24%10.88%
Dmitry Torokhov80.21%32.63%
Harvey Harrison80.21%10.88%
Robert P. J. Day70.18%21.75%
Arjan van de Ven60.16%10.88%
Alan Stern60.16%10.88%
Anand Jain50.13%10.88%
Jeff Mahoney50.13%10.88%
Alexander Chiang50.13%10.88%
Pankaj Dubey40.10%10.88%
Tim Schmielau30.08%10.88%
Emese Revfy30.08%21.75%
Kees Cook20.05%10.88%
Mika Kukkonen20.05%10.88%
Burman Yan10.03%10.88%
Zhi Yong Wu10.03%10.88%
Anatol Pomozov10.03%10.88%
Fengguang Wu10.03%10.88%
Paul Gortmaker10.03%10.88%
Bart Van Assche10.03%10.88%
Total3821100.00%114100.00%
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