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30#include <linux/string.h>
31#include <linux/module.h>
32#include <linux/stat.h>
33#include <linux/slab.h>
34
35#include <linux/configfs.h>
36
37
38static inline struct config_item * to_item(struct list_head * entry)
39{
40 return container_of(entry,struct config_item,ci_entry);
41}
42
43
44static void config_item_release(struct kref *kref);
45
46
47
48
49
50void config_item_init(struct config_item * item)
51{
52 kref_init(&item->ci_kref);
53 INIT_LIST_HEAD(&item->ci_entry);
54}
55
56
57
58
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60
61
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63
64
65int config_item_set_name(struct config_item * item, const char * fmt, ...)
66{
67 int error = 0;
68 int limit = CONFIGFS_ITEM_NAME_LEN;
69 int need;
70 va_list args;
71 char * name;
72
73
74
75
76 va_start(args,fmt);
77 need = vsnprintf(item->ci_namebuf,limit,fmt,args);
78 va_end(args);
79 if (need < limit)
80 name = item->ci_namebuf;
81 else {
82
83
84
85 limit = need + 1;
86 name = kmalloc(limit,GFP_KERNEL);
87 if (!name) {
88 error = -ENOMEM;
89 goto Done;
90 }
91 va_start(args,fmt);
92 need = vsnprintf(name,limit,fmt,args);
93 va_end(args);
94
95
96 if (need >= limit) {
97 kfree(name);
98 error = -EFAULT;
99 goto Done;
100 }
101 }
102
103
104 if (item->ci_name && item->ci_name != item->ci_namebuf)
105 kfree(item->ci_name);
106
107
108 item->ci_name = name;
109 Done:
110 return error;
111}
112
113EXPORT_SYMBOL(config_item_set_name);
114
115void config_item_init_type_name(struct config_item *item,
116 const char *name,
117 struct config_item_type *type)
118{
119 config_item_set_name(item, name);
120 item->ci_type = type;
121 config_item_init(item);
122}
123EXPORT_SYMBOL(config_item_init_type_name);
124
125void config_group_init_type_name(struct config_group *group, const char *name,
126 struct config_item_type *type)
127{
128 config_item_set_name(&group->cg_item, name);
129 group->cg_item.ci_type = type;
130 config_group_init(group);
131}
132EXPORT_SYMBOL(config_group_init_type_name);
133
134struct config_item * config_item_get(struct config_item * item)
135{
136 if (item)
137 kref_get(&item->ci_kref);
138 return item;
139}
140
141static void config_item_cleanup(struct config_item * item)
142{
143 struct config_item_type * t = item->ci_type;
144 struct config_group * s = item->ci_group;
145 struct config_item * parent = item->ci_parent;
146
147 pr_debug("config_item %s: cleaning up\n",config_item_name(item));
148 if (item->ci_name != item->ci_namebuf)
149 kfree(item->ci_name);
150 item->ci_name = NULL;
151 if (t && t->ct_item_ops && t->ct_item_ops->release)
152 t->ct_item_ops->release(item);
153 if (s)
154 config_group_put(s);
155 if (parent)
156 config_item_put(parent);
157}
158
159static void config_item_release(struct kref *kref)
160{
161 config_item_cleanup(container_of(kref, struct config_item, ci_kref));
162}
163
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167
168
169
170void config_item_put(struct config_item * item)
171{
172 if (item)
173 kref_put(&item->ci_kref, config_item_release);
174}
175
176
177
178
179
180void config_group_init(struct config_group *group)
181{
182 config_item_init(&group->cg_item);
183 INIT_LIST_HEAD(&group->cg_children);
184}
185
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193
194
195struct config_item *config_group_find_item(struct config_group *group,
196 const char *name)
197{
198 struct list_head * entry;
199 struct config_item * ret = NULL;
200
201 list_for_each(entry,&group->cg_children) {
202 struct config_item * item = to_item(entry);
203 if (config_item_name(item) &&
204 !strcmp(config_item_name(item), name)) {
205 ret = config_item_get(item);
206 break;
207 }
208 }
209 return ret;
210}
211
212EXPORT_SYMBOL(config_item_init);
213EXPORT_SYMBOL(config_group_init);
214EXPORT_SYMBOL(config_item_get);
215EXPORT_SYMBOL(config_item_put);
216EXPORT_SYMBOL(config_group_find_item);
217