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-rw-r--r--fs/configfs/configfs_internal.h142
1 files changed, 142 insertions, 0 deletions
diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/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
30struct configfs_dirent {
31 atomic_t s_count;
32 struct list_head s_sibling;
33 struct list_head s_children;
34 struct list_head s_links;
35 void * s_element;
36 int s_type;
37 umode_t s_mode;
38 struct dentry * s_dentry;
39};
40
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)
49
50extern struct vfsmount * configfs_mount;
51
52extern int configfs_is_root(struct config_item *item);
53
54extern struct inode * configfs_new_inode(mode_t mode);
55extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *));
56
57extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
58extern int configfs_make_dirent(struct configfs_dirent *,
59 struct dentry *, void *, umode_t, int);
60
61extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int);
62extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
63
64extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
65extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
66
67extern int configfs_pin_fs(void);
68extern void configfs_release_fs(void);
69
70extern struct rw_semaphore configfs_rename_sem;
71extern struct super_block * configfs_sb;
72extern struct file_operations configfs_dir_operations;
73extern struct file_operations configfs_file_operations;
74extern struct file_operations bin_fops;
75extern struct inode_operations configfs_dir_inode_operations;
76extern struct inode_operations configfs_symlink_inode_operations;
77
78extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
79 const char *symname);
80extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
81
82struct configfs_symlink {
83 struct list_head sl_list;
84 struct config_item *sl_target;
85};
86
87extern int configfs_create_link(struct configfs_symlink *sl,
88 struct dentry *parent,
89 struct dentry *dentry);
90
91static inline struct config_item * to_item(struct dentry * dentry)
92{
93 struct configfs_dirent * sd = dentry->d_fsdata;
94 return ((struct config_item *) sd->s_element);
95}
96
97static inline struct configfs_attribute * to_attr(struct dentry * dentry)
98{
99 struct configfs_dirent * sd = dentry->d_fsdata;
100 return ((struct configfs_attribute *) sd->s_element);
101}
102
103static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
104{
105 struct config_item * item = NULL;
106
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);
113 } else
114 item = config_item_get(sd->s_element);
115 }
116 spin_unlock(&dcache_lock);
117
118 return item;
119}
120
121static inline void release_configfs_dirent(struct configfs_dirent * sd)
122{
123 if (!(sd->s_type & CONFIGFS_ROOT))
124 kfree(sd);
125}
126
127static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
128{
129 if (sd) {
130 WARN_ON(!atomic_read(&sd->s_count));
131 atomic_inc(&sd->s_count);
132 }
133 return sd;
134}
135
136static inline void configfs_put(struct configfs_dirent * sd)
137{
138 WARN_ON(!atomic_read(&sd->s_count));
139 if (atomic_dec_and_test(&sd->s_count))
140 release_configfs_dirent(sd);
141}
142
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