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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 : #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 1 : extern struct mutex configfs_symlink_mutex;
59 1 : extern spinlock_t configfs_dirent_lock;
60 :
61 1 : extern struct vfsmount * configfs_mount;
62 1 : 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 1 : extern struct rw_semaphore configfs_rename_sem;
87 1 : extern struct super_block * configfs_sb;
88 1 : extern const struct file_operations configfs_dir_operations;
89 1 : extern const struct file_operations configfs_file_operations;
90 : extern const struct file_operations bin_fops;
91 1 : extern const struct inode_operations configfs_dir_inode_operations;
92 1 : extern const struct inode_operations configfs_symlink_inode_operations;
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 1 :
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 :
107 : static inline struct config_item * to_item(struct dentry * dentry)
108 : {
109 9 : struct configfs_dirent * sd = dentry->d_fsdata;
110 6 : return ((struct config_item *) sd->s_element);
111 : }
112 :
113 : static inline struct configfs_attribute * to_attr(struct dentry * dentry)
114 : {
115 12 : struct configfs_dirent * sd = dentry->d_fsdata;
116 8 : return ((struct configfs_attribute *) sd->s_element);
117 : }
118 :
119 : static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
120 : {
121 18 : struct config_item * item = NULL;
122 9 :
123 27 : spin_lock(&dcache_lock);
124 45 : if (!d_unhashed(dentry)) {
125 18 : struct configfs_dirent * sd = dentry->d_fsdata;
126 18 : if (sd->s_type & CONFIGFS_ITEM_LINK) {
127 18 : struct configfs_symlink * sl = sd->s_element;
128 18 : item = config_item_get(sl->sl_target);
129 : } else
130 27 : item = config_item_get(sd->s_element);
131 : }
132 54 : spin_unlock(&dcache_lock);
133 :
134 9 : return item;
135 : }
136 :
137 : static inline void release_configfs_dirent(struct configfs_dirent * sd)
138 : {
139 46 : if (!(sd->s_type & CONFIGFS_ROOT)) {
140 46 : kfree(sd->s_iattr);
141 23 : kmem_cache_free(configfs_dir_cachep, sd);
142 : }
143 23 : }
144 :
145 : static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
146 : {
147 24 : if (sd) {
148 88 : WARN_ON(!atomic_read(&sd->s_count));
149 24 : atomic_inc(&sd->s_count);
150 : }
151 16 : return sd;
152 : }
153 :
154 : static inline void configfs_put(struct configfs_dirent * sd)
155 : {
156 242 : WARN_ON(!atomic_read(&sd->s_count));
157 110 : if (atomic_dec_and_test(&sd->s_count))
158 66 : release_configfs_dirent(sd);
159 66 : }
160 1 :
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