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