1 /* -*- mode: c; c-basic-offset:8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
4 * configfs_internal.h - Internal stuff for configfs
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.
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.
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.
22 * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
24 * configfs Copyright (C) 2005 Oracle. All rights reserved.
27 #include <linux/slab.h>
28 #include <linux/list.h>
30 struct configfs_dirent
{
32 struct list_head s_sibling
;
33 struct list_head s_children
;
34 struct list_head s_links
;
38 struct dentry
* s_dentry
;
41 #define CONFIGFS_ROOT 0x0001
42 #define CONFIGFS_DIR 0x0002
43 #define CONFIGFS_ITEM_ATTR 0x0004
44 #define CONFIGFS_ITEM_LINK 0x0020
45 #define CONFIGFS_USET_DIR 0x0040
46 #define CONFIGFS_USET_DEFAULT 0x0080
47 #define CONFIGFS_USET_DROPPING 0x0100
48 #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR)
50 extern struct vfsmount
* configfs_mount
;
52 extern int configfs_is_root(struct config_item
*item
);
54 extern struct inode
* configfs_new_inode(mode_t mode
);
55 extern int configfs_create(struct dentry
*, int mode
, int (*init
)(struct inode
*));
57 extern int configfs_create_file(struct config_item
*, const struct configfs_attribute
*);
58 extern int configfs_make_dirent(struct configfs_dirent
*,
59 struct dentry
*, void *, umode_t
, int);
61 extern int configfs_add_file(struct dentry
*, const struct configfs_attribute
*, int);
62 extern void configfs_hash_and_remove(struct dentry
* dir
, const char * name
);
64 extern const unsigned char * configfs_get_name(struct configfs_dirent
*sd
);
65 extern void configfs_drop_dentry(struct configfs_dirent
*sd
, struct dentry
*parent
);
67 extern int configfs_pin_fs(void);
68 extern void configfs_release_fs(void);
70 extern struct rw_semaphore configfs_rename_sem
;
71 extern struct super_block
* configfs_sb
;
72 extern struct file_operations configfs_dir_operations
;
73 extern struct file_operations configfs_file_operations
;
74 extern struct file_operations bin_fops
;
75 extern struct inode_operations configfs_dir_inode_operations
;
76 extern struct inode_operations configfs_symlink_inode_operations
;
78 extern int configfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
80 extern int configfs_unlink(struct inode
*dir
, struct dentry
*dentry
);
82 struct configfs_symlink
{
83 struct list_head sl_list
;
84 struct config_item
*sl_target
;
87 extern int configfs_create_link(struct configfs_symlink
*sl
,
88 struct dentry
*parent
,
89 struct dentry
*dentry
);
91 static inline struct config_item
* to_item(struct dentry
* dentry
)
93 struct configfs_dirent
* sd
= dentry
->d_fsdata
;
94 return ((struct config_item
*) sd
->s_element
);
97 static inline struct configfs_attribute
* to_attr(struct dentry
* dentry
)
99 struct configfs_dirent
* sd
= dentry
->d_fsdata
;
100 return ((struct configfs_attribute
*) sd
->s_element
);
103 static inline struct config_item
*configfs_get_config_item(struct dentry
*dentry
)
105 struct config_item
* item
= NULL
;
107 spin_lock(&dcache_lock
);
108 if (!d_unhashed(dentry
)) {
109 struct configfs_dirent
* sd
= dentry
->d_fsdata
;
110 if (sd
->s_type
& CONFIGFS_ITEM_LINK
) {
111 struct configfs_symlink
* sl
= sd
->s_element
;
112 item
= config_item_get(sl
->sl_target
);
114 item
= config_item_get(sd
->s_element
);
116 spin_unlock(&dcache_lock
);
121 static inline void release_configfs_dirent(struct configfs_dirent
* sd
)
123 if (!(sd
->s_type
& CONFIGFS_ROOT
))
127 static inline struct configfs_dirent
* configfs_get(struct configfs_dirent
* sd
)
130 WARN_ON(!atomic_read(&sd
->s_count
));
131 atomic_inc(&sd
->s_count
);
136 static inline void configfs_put(struct configfs_dirent
* sd
)
138 WARN_ON(!atomic_read(&sd
->s_count
));
139 if (atomic_dec_and_test(&sd
->s_count
))
140 release_configfs_dirent(sd
);