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 vfsmount * configfs_mount;
62 extern struct kmem_cache *configfs_dir_cachep;
63
64 extern int configfs_is_root(struct config_item *item);
65
66 extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *);
67 extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *));
68 extern int configfs_inode_init(void);
69 extern void configfs_inode_exit(void);
70
71 extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
72 extern int configfs_make_dirent(struct configfs_dirent *,
73 struct dentry *, void *, umode_t, int);
74 extern int configfs_dirent_is_ready(struct configfs_dirent *);
75
76 extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int);
77 extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
78
79 extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
80 extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
81 extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
82
83 extern int configfs_pin_fs(void);
84 extern void configfs_release_fs(void);
85
86 extern struct rw_semaphore configfs_rename_sem;
87 extern struct super_block * configfs_sb;
88 extern const struct file_operations configfs_dir_operations;
89 extern const struct file_operations configfs_file_operations;
90 extern const struct file_operations bin_fops;
91 extern const struct inode_operations configfs_dir_inode_operations;
92 extern const struct inode_operations configfs_symlink_inode_operations;
93 extern const struct dentry_operations configfs_dentry_ops;
94
95 extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
96 const char *symname);
97 extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
98
99 struct configfs_symlink {
100 struct list_head sl_list;
101 struct config_item *sl_target;
102 };
103
104 extern int configfs_create_link(struct configfs_symlink *sl,
105 struct dentry *parent,
106 struct dentry *dentry);
107
to_item(struct dentry * dentry)108 static inline struct config_item * to_item(struct dentry * dentry)
109 {
110 struct configfs_dirent * sd = dentry->d_fsdata;
111 return ((struct config_item *) sd->s_element);
112 }
113
to_attr(struct dentry * dentry)114 static inline struct configfs_attribute * to_attr(struct dentry * dentry)
115 {
116 struct configfs_dirent * sd = dentry->d_fsdata;
117 return ((struct configfs_attribute *) sd->s_element);
118 }
119
configfs_get_config_item(struct dentry * dentry)120 static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
121 {
122 struct config_item * item = NULL;
123
124 spin_lock(&dentry->d_lock);
125 if (!d_unhashed(dentry)) {
126 struct configfs_dirent * sd = dentry->d_fsdata;
127 if (sd->s_type & CONFIGFS_ITEM_LINK) {
128 struct configfs_symlink * sl = sd->s_element;
129 item = config_item_get(sl->sl_target);
130 } else
131 item = config_item_get(sd->s_element);
132 }
133 spin_unlock(&dentry->d_lock);
134
135 return item;
136 }
137
release_configfs_dirent(struct configfs_dirent * sd)138 static inline void release_configfs_dirent(struct configfs_dirent * sd)
139 {
140 if (!(sd->s_type & CONFIGFS_ROOT)) {
141 kfree(sd->s_iattr);
142 kmem_cache_free(configfs_dir_cachep, sd);
143 }
144 }
145
configfs_get(struct configfs_dirent * sd)146 static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
147 {
148 if (sd) {
149 WARN_ON(!atomic_read(&sd->s_count));
150 atomic_inc(&sd->s_count);
151 }
152 return sd;
153 }
154
configfs_put(struct configfs_dirent * sd)155 static inline void configfs_put(struct configfs_dirent * sd)
156 {
157 WARN_ON(!atomic_read(&sd->s_count));
158 if (atomic_dec_and_test(&sd->s_count))
159 release_configfs_dirent(sd);
160 }
161
162