1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29#ifndef _LINUX_KOBJECT_H_ 30#define _LINUX_KOBJECT_H_ 31 32#include <machine/stdarg.h> 33 34#include <linux/kernel.h> 35#include <linux/kref.h> 36#include <linux/slab.h> 37 38struct kobject; 39struct sysctl_oid; 40 41struct kobj_type { 42 void (*release)(struct kobject *kobj); 43 const struct sysfs_ops *sysfs_ops; 44 struct attribute **default_attrs; 45}; 46 47extern struct kobj_type kfree_type; 48 49struct kobject { 50 struct kobject *parent; 51 char *name; 52 struct kref kref; 53 struct kobj_type *ktype; 54 struct list_head entry; 55 struct sysctl_oid *oidp; 56}; 57 58extern struct kobject *mm_kobj; 59 60static inline void 61kobject_init(struct kobject *kobj, struct kobj_type *ktype) 62{ 63 64 kref_init(&kobj->kref); 65 INIT_LIST_HEAD(&kobj->entry); 66 kobj->ktype = ktype; 67 kobj->oidp = NULL; 68} 69 70static inline void kobject_put(struct kobject *kobj); 71void kobject_release(struct kref *kref); 72 73static inline void 74kobject_put(struct kobject *kobj) 75{ 76 77 if (kobj) 78 kref_put(&kobj->kref, kobject_release); 79} 80 81static inline struct kobject * 82kobject_get(struct kobject *kobj) 83{ 84 85 if (kobj) 86 kref_get(&kobj->kref); 87 return kobj; 88} 89 90static inline int 91kobject_set_name_vargs(struct kobject *kobj, const char *fmt, va_list args) 92{ 93 char *old; 94 char *name; 95 96 old = kobj->name; 97 98 if (old && !fmt) 99 return 0; 100 101 name = kzalloc(MAXPATHLEN, GFP_KERNEL); 102 if (!name) 103 return -ENOMEM; 104 vsnprintf(name, MAXPATHLEN, fmt, args); 105 kobj->name = name; 106 kfree(old); 107 for (; *name != '\0'; name++) 108 if (*name == '/') 109 *name = '!'; 110 return (0); 111} 112 113int kobject_add(struct kobject *kobj, struct kobject *parent, 114 const char *fmt, ...); 115 116static inline struct kobject * 117kobject_create(void) 118{ 119 struct kobject *kobj; 120 121 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); 122 if (kobj == NULL) 123 return (NULL); 124 kobject_init(kobj, &kfree_type); 125 126 return (kobj); 127} 128 129static inline struct kobject * 130kobject_create_and_add(const char *name, struct kobject *parent) 131{ 132 struct kobject *kobj; 133 134 kobj = kobject_create(); 135 if (kobj == NULL) 136 return (NULL); 137 if (kobject_add(kobj, parent, "%s", name) == 0) 138 return (kobj); 139 kobject_put(kobj); 140 141 return (NULL); 142} 143 144 145static inline char * 146kobject_name(const struct kobject *kobj) 147{ 148 149 return kobj->name; 150} 151 152int kobject_set_name(struct kobject *kobj, const char *fmt, ...); 153int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype, 154 struct kobject *parent, const char *fmt, ...); 155 156/* sysfs.h calles for 'kobject' which is defined here, 157 * so we need to add the include only after the 'kobject' def. 158 */ 159#include <linux/sysfs.h> 160 161struct kobj_attribute { 162 struct attribute attr; 163 ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, 164 char *buf); 165 ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr, 166 const char *buf, size_t count); 167}; 168 169#endif /* _LINUX_KOBJECT_H_ */ 170