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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * configfs.h - definitions for the device driver filesystem | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public | |
17 | * License along with this program; if not, write to the | |
18 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | * Boston, MA 021110-1307, USA. | |
20 | * | |
21 | * Based on sysfs: | |
22 | * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel | |
23 | * | |
24 | * Based on kobject.h: | |
25 | * Copyright (c) 2002-2003 Patrick Mochel | |
26 | * Copyright (c) 2002-2003 Open Source Development Labs | |
27 | * | |
28 | * configfs Copyright (C) 2005 Oracle. All rights reserved. | |
29 | * | |
55dff495 RD |
30 | * Please read Documentation/filesystems/configfs/configfs.txt before using |
31 | * the configfs interface, ESPECIALLY the parts about reference counts and | |
7063fbf2 JB |
32 | * item destructors. |
33 | */ | |
34 | ||
35 | #ifndef _CONFIGFS_H_ | |
36 | #define _CONFIGFS_H_ | |
37 | ||
07783618 | 38 | #include <linux/kernel.h> |
7063fbf2 JB |
39 | #include <linux/types.h> |
40 | #include <linux/list.h> | |
41 | #include <linux/kref.h> | |
e6bd07ae | 42 | #include <linux/mutex.h> |
dacdd0e0 | 43 | #include <linux/err.h> |
7063fbf2 | 44 | |
60063497 | 45 | #include <linux/atomic.h> |
7063fbf2 JB |
46 | |
47 | #define CONFIGFS_ITEM_NAME_LEN 20 | |
48 | ||
49 | struct module; | |
50 | ||
51 | struct configfs_item_operations; | |
52 | struct configfs_group_operations; | |
53 | struct configfs_attribute; | |
54 | struct configfs_subsystem; | |
55 | ||
56 | struct config_item { | |
57 | char *ci_name; | |
58 | char ci_namebuf[CONFIGFS_ITEM_NAME_LEN]; | |
59 | struct kref ci_kref; | |
60 | struct list_head ci_entry; | |
61 | struct config_item *ci_parent; | |
62 | struct config_group *ci_group; | |
63 | struct config_item_type *ci_type; | |
64 | struct dentry *ci_dentry; | |
65 | }; | |
66 | ||
8db14860 NI |
67 | extern __printf(2, 3) |
68 | int config_item_set_name(struct config_item *, const char *, ...); | |
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69 | |
70 | static inline char *config_item_name(struct config_item * item) | |
71 | { | |
72 | return item->ci_name; | |
73 | } | |
74 | ||
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75 | extern void config_item_init_type_name(struct config_item *item, |
76 | const char *name, | |
77 | struct config_item_type *type); | |
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78 | |
79 | extern struct config_item * config_item_get(struct config_item *); | |
80 | extern void config_item_put(struct config_item *); | |
81 | ||
82 | struct config_item_type { | |
83 | struct module *ct_owner; | |
84 | struct configfs_item_operations *ct_item_ops; | |
85 | struct configfs_group_operations *ct_group_ops; | |
86 | struct configfs_attribute **ct_attrs; | |
87 | }; | |
88 | ||
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89 | /** |
90 | * group - a group of config_items of a specific type, belonging | |
91 | * to a specific subsystem. | |
92 | */ | |
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93 | struct config_group { |
94 | struct config_item cg_item; | |
95 | struct list_head cg_children; | |
96 | struct configfs_subsystem *cg_subsys; | |
97 | struct config_group **default_groups; | |
98 | }; | |
99 | ||
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100 | extern void config_group_init(struct config_group *group); |
101 | extern void config_group_init_type_name(struct config_group *group, | |
102 | const char *name, | |
103 | struct config_item_type *type); | |
104 | ||
7063fbf2 JB |
105 | static inline struct config_group *to_config_group(struct config_item *item) |
106 | { | |
107 | return item ? container_of(item,struct config_group,cg_item) : NULL; | |
108 | } | |
109 | ||
110 | static inline struct config_group *config_group_get(struct config_group *group) | |
111 | { | |
112 | return group ? to_config_group(config_item_get(&group->cg_item)) : NULL; | |
113 | } | |
114 | ||
115 | static inline void config_group_put(struct config_group *group) | |
116 | { | |
117 | config_item_put(&group->cg_item); | |
118 | } | |
119 | ||
3fe6c5ce SS |
120 | extern struct config_item *config_group_find_item(struct config_group *, |
121 | const char *); | |
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122 | |
123 | ||
124 | struct configfs_attribute { | |
3d0f89bb | 125 | const char *ca_name; |
7063fbf2 | 126 | struct module *ca_owner; |
43947514 | 127 | umode_t ca_mode; |
870823e6 CH |
128 | ssize_t (*show)(struct config_item *, char *); |
129 | ssize_t (*store)(struct config_item *, const char *, size_t); | |
7063fbf2 JB |
130 | }; |
131 | ||
870823e6 CH |
132 | #define CONFIGFS_ATTR(_pfx, _name) \ |
133 | static struct configfs_attribute _pfx##attr_##_name = { \ | |
134 | .ca_name = __stringify(_name), \ | |
135 | .ca_mode = S_IRUGO | S_IWUSR, \ | |
136 | .ca_owner = THIS_MODULE, \ | |
137 | .show = _pfx##_name##_show, \ | |
138 | .store = _pfx##_name##_store, \ | |
139 | } | |
140 | ||
141 | #define CONFIGFS_ATTR_RO(_pfx, _name) \ | |
142 | static struct configfs_attribute _pfx##attr_##_name = { \ | |
143 | .ca_name = __stringify(_name), \ | |
144 | .ca_mode = S_IRUGO, \ | |
145 | .ca_owner = THIS_MODULE, \ | |
146 | .show = _pfx##_name##_show, \ | |
147 | } | |
148 | ||
149 | #define CONFIGFS_ATTR_WO(_pfx, _name) \ | |
150 | static struct configfs_attribute _pfx##attr_##_name = { \ | |
151 | .ca_name = __stringify(_name), \ | |
152 | .ca_mode = S_IWUSR, \ | |
153 | .ca_owner = THIS_MODULE, \ | |
154 | .store = _pfx##_name##_store, \ | |
155 | } | |
156 | ||
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157 | /* |
158 | * If allow_link() exists, the item can symlink(2) out to other | |
159 | * items. If the item is a group, it may support mkdir(2). | |
160 | * Groups supply one of make_group() and make_item(). If the | |
161 | * group supports make_group(), one can create group children. If it | |
a6795e9e JB |
162 | * supports make_item(), one can create config_item children. make_group() |
163 | * and make_item() return ERR_PTR() on errors. If it has | |
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164 | * default_groups on group->default_groups, it has automatically created |
165 | * group children. default_groups may coexist alongsize make_group() or | |
166 | * make_item(), but if the group wishes to have only default_groups | |
167 | * children (disallowing mkdir(2)), it need not provide either function. | |
25985edc | 168 | * If the group has commit(), it supports pending and committed (active) |
7063fbf2 JB |
169 | * items. |
170 | */ | |
171 | struct configfs_item_operations { | |
172 | void (*release)(struct config_item *); | |
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173 | int (*allow_link)(struct config_item *src, struct config_item *target); |
174 | int (*drop_link)(struct config_item *src, struct config_item *target); | |
175 | }; | |
176 | ||
177 | struct configfs_group_operations { | |
f89ab861 JB |
178 | struct config_item *(*make_item)(struct config_group *group, const char *name); |
179 | struct config_group *(*make_group)(struct config_group *group, const char *name); | |
7063fbf2 | 180 | int (*commit_item)(struct config_item *item); |
299894cc | 181 | void (*disconnect_notify)(struct config_group *group, struct config_item *item); |
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182 | void (*drop_item)(struct config_group *group, struct config_item *item); |
183 | }; | |
184 | ||
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185 | struct configfs_subsystem { |
186 | struct config_group su_group; | |
e6bd07ae | 187 | struct mutex su_mutex; |
7063fbf2 JB |
188 | }; |
189 | ||
190 | static inline struct configfs_subsystem *to_configfs_subsystem(struct config_group *group) | |
191 | { | |
192 | return group ? | |
193 | container_of(group, struct configfs_subsystem, su_group) : | |
194 | NULL; | |
195 | } | |
196 | ||
197 | int configfs_register_subsystem(struct configfs_subsystem *subsys); | |
198 | void configfs_unregister_subsystem(struct configfs_subsystem *subsys); | |
199 | ||
5cf6a51e DB |
200 | int configfs_register_group(struct config_group *parent_group, |
201 | struct config_group *group); | |
202 | void configfs_unregister_group(struct config_group *group); | |
203 | ||
204 | struct config_group * | |
205 | configfs_register_default_group(struct config_group *parent_group, | |
206 | const char *name, | |
207 | struct config_item_type *item_type); | |
208 | void configfs_unregister_default_group(struct config_group *group); | |
209 | ||
631d1feb JB |
210 | /* These functions can sleep and can alloc with GFP_KERNEL */ |
211 | /* WARNING: These cannot be called underneath configfs callbacks!! */ | |
212 | int configfs_depend_item(struct configfs_subsystem *subsys, struct config_item *target); | |
213 | void configfs_undepend_item(struct configfs_subsystem *subsys, struct config_item *target); | |
214 | ||
7063fbf2 | 215 | #endif /* _CONFIGFS_H_ */ |