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Linux kernel mirror (for testing)
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1/* -*- mode: c; c-basic-offset:8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * configfs_internal.h - Internal stuff for configfs
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 * configfs Copyright (C) 2005 Oracle. All rights reserved.
25 */
26
27#ifdef pr_fmt
28#undef pr_fmt
29#endif
30
31#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32
33#include <linux/slab.h>
34#include <linux/list.h>
35#include <linux/spinlock.h>
36
37struct configfs_dirent {
38 atomic_t s_count;
39 int s_dependent_count;
40 struct list_head s_sibling;
41 struct list_head s_children;
42 struct list_head s_links;
43 void * s_element;
44 int s_type;
45 umode_t s_mode;
46 struct dentry * s_dentry;
47 struct iattr * s_iattr;
48#ifdef CONFIG_LOCKDEP
49 int s_depth;
50#endif
51};
52
53#define CONFIGFS_ROOT 0x0001
54#define CONFIGFS_DIR 0x0002
55#define CONFIGFS_ITEM_ATTR 0x0004
56#define CONFIGFS_ITEM_BIN_ATTR 0x0008
57#define CONFIGFS_ITEM_LINK 0x0020
58#define CONFIGFS_USET_DIR 0x0040
59#define CONFIGFS_USET_DEFAULT 0x0080
60#define CONFIGFS_USET_DROPPING 0x0100
61#define CONFIGFS_USET_IN_MKDIR 0x0200
62#define CONFIGFS_USET_CREATING 0x0400
63#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR)
64
65extern struct mutex configfs_symlink_mutex;
66extern spinlock_t configfs_dirent_lock;
67
68extern struct kmem_cache *configfs_dir_cachep;
69
70extern int configfs_is_root(struct config_item *item);
71
72extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
73extern int configfs_create(struct dentry *, umode_t mode, void (*init)(struct inode *));
74
75extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
76extern int configfs_create_bin_file(struct config_item *,
77 const struct configfs_bin_attribute *);
78extern int configfs_make_dirent(struct configfs_dirent *,
79 struct dentry *, void *, umode_t, int);
80extern int configfs_dirent_is_ready(struct configfs_dirent *);
81
82extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
83
84extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
85extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
86extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
87
88extern struct dentry *configfs_pin_fs(void);
89extern void configfs_release_fs(void);
90
91extern struct rw_semaphore configfs_rename_sem;
92extern const struct file_operations configfs_dir_operations;
93extern const struct file_operations configfs_file_operations;
94extern const struct file_operations configfs_bin_file_operations;
95extern const struct inode_operations configfs_dir_inode_operations;
96extern const struct inode_operations configfs_root_inode_operations;
97extern const struct inode_operations configfs_symlink_inode_operations;
98extern const struct dentry_operations configfs_dentry_ops;
99
100extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
101 const char *symname);
102extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
103
104struct configfs_symlink {
105 struct list_head sl_list;
106 struct config_item *sl_target;
107};
108
109extern int configfs_create_link(struct configfs_symlink *sl,
110 struct dentry *parent,
111 struct dentry *dentry);
112
113static inline struct config_item * to_item(struct dentry * dentry)
114{
115 struct configfs_dirent * sd = dentry->d_fsdata;
116 return ((struct config_item *) sd->s_element);
117}
118
119static inline struct configfs_attribute * to_attr(struct dentry * dentry)
120{
121 struct configfs_dirent * sd = dentry->d_fsdata;
122 return ((struct configfs_attribute *) sd->s_element);
123}
124
125static inline struct configfs_bin_attribute *to_bin_attr(struct dentry *dentry)
126{
127 struct configfs_attribute *attr = to_attr(dentry);
128
129 return container_of(attr, struct configfs_bin_attribute, cb_attr);
130}
131
132static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
133{
134 struct config_item * item = NULL;
135
136 spin_lock(&dentry->d_lock);
137 if (!d_unhashed(dentry)) {
138 struct configfs_dirent * sd = dentry->d_fsdata;
139 if (sd->s_type & CONFIGFS_ITEM_LINK) {
140 struct configfs_symlink * sl = sd->s_element;
141 item = config_item_get(sl->sl_target);
142 } else
143 item = config_item_get(sd->s_element);
144 }
145 spin_unlock(&dentry->d_lock);
146
147 return item;
148}
149
150static inline void release_configfs_dirent(struct configfs_dirent * sd)
151{
152 if (!(sd->s_type & CONFIGFS_ROOT)) {
153 kfree(sd->s_iattr);
154 kmem_cache_free(configfs_dir_cachep, sd);
155 }
156}
157
158static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
159{
160 if (sd) {
161 WARN_ON(!atomic_read(&sd->s_count));
162 atomic_inc(&sd->s_count);
163 }
164 return sd;
165}
166
167static inline void configfs_put(struct configfs_dirent * sd)
168{
169 WARN_ON(!atomic_read(&sd->s_count));
170 if (atomic_dec_and_test(&sd->s_count))
171 release_configfs_dirent(sd);
172}
173