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configfs_internal.h
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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 
37  void * s_element;
38  int s_type;
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;
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;
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 
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  struct configfs_dirent * sd = dentry->d_fsdata;
110  return ((struct config_item *) sd->s_element);
111 }
112 
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 
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 
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 
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 
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