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