]>
Commit | Line | Data |
---|---|---|
7063fbf2 JB |
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 | ||
30 | struct 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 | ||
50 | extern struct vfsmount * configfs_mount; | |
51 | ||
52 | extern int configfs_is_root(struct config_item *item); | |
53 | ||
54 | extern struct inode * configfs_new_inode(mode_t mode); | |
55 | extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *)); | |
56 | ||
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); | |
60 | ||
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); | |
63 | ||
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); | |
66 | ||
67 | extern int configfs_pin_fs(void); | |
68 | extern void configfs_release_fs(void); | |
69 | ||
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; | |
77 | ||
78 | extern int configfs_symlink(struct inode *dir, struct dentry *dentry, | |
79 | const char *symname); | |
80 | extern int configfs_unlink(struct inode *dir, struct dentry *dentry); | |
81 | ||
82 | struct configfs_symlink { | |
83 | struct list_head sl_list; | |
84 | struct config_item *sl_target; | |
85 | }; | |
86 | ||
87 | extern int configfs_create_link(struct configfs_symlink *sl, | |
88 | struct dentry *parent, | |
89 | struct dentry *dentry); | |
90 | ||
91 | static 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 | ||
97 | static 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 | ||
103 | static 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 | ||
121 | static inline void release_configfs_dirent(struct configfs_dirent * sd) | |
122 | { | |
123 | if (!(sd->s_type & CONFIGFS_ROOT)) | |
124 | kfree(sd); | |
125 | } | |
126 | ||
127 | static 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 | ||
136 | static 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 |