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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 | ||
30 | struct configfs_dirent { | |
31 | atomic_t s_count; | |
631d1feb | 32 | int s_dependent_count; |
7063fbf2 JB |
33 | struct list_head s_sibling; |
34 | struct list_head s_children; | |
35 | struct list_head s_links; | |
631d1feb | 36 | void * s_element; |
7063fbf2 JB |
37 | int s_type; |
38 | umode_t s_mode; | |
39 | struct dentry * s_dentry; | |
3d0f89bb | 40 | struct iattr * s_iattr; |
7063fbf2 JB |
41 | }; |
42 | ||
43 | #define CONFIGFS_ROOT 0x0001 | |
44 | #define CONFIGFS_DIR 0x0002 | |
631d1feb JB |
45 | #define CONFIGFS_ITEM_ATTR 0x0004 |
46 | #define CONFIGFS_ITEM_LINK 0x0020 | |
7063fbf2 JB |
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 | ||
52 | extern struct vfsmount * configfs_mount; | |
e18b890b | 53 | extern struct kmem_cache *configfs_dir_cachep; |
7063fbf2 JB |
54 | |
55 | extern int configfs_is_root(struct config_item *item); | |
56 | ||
3d0f89bb | 57 | extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *); |
7063fbf2 | 58 | extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *)); |
e0bf68dd PZ |
59 | extern int configfs_inode_init(void); |
60 | extern void configfs_inode_exit(void); | |
7063fbf2 JB |
61 | |
62 | extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); | |
63 | extern int configfs_make_dirent(struct configfs_dirent *, | |
64 | struct dentry *, void *, umode_t, int); | |
65 | ||
66 | extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int); | |
67 | extern void configfs_hash_and_remove(struct dentry * dir, const char * name); | |
68 | ||
69 | extern const unsigned char * configfs_get_name(struct configfs_dirent *sd); | |
70 | extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent); | |
3d0f89bb | 71 | extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr); |
7063fbf2 JB |
72 | |
73 | extern int configfs_pin_fs(void); | |
74 | extern void configfs_release_fs(void); | |
75 | ||
76 | extern struct rw_semaphore configfs_rename_sem; | |
77 | extern struct super_block * configfs_sb; | |
4b6f5d20 AV |
78 | extern const struct file_operations configfs_dir_operations; |
79 | extern const struct file_operations configfs_file_operations; | |
80 | extern const struct file_operations bin_fops; | |
754661f1 AV |
81 | extern const struct inode_operations configfs_dir_inode_operations; |
82 | extern const struct inode_operations configfs_symlink_inode_operations; | |
7063fbf2 JB |
83 | |
84 | extern int configfs_symlink(struct inode *dir, struct dentry *dentry, | |
85 | const char *symname); | |
86 | extern int configfs_unlink(struct inode *dir, struct dentry *dentry); | |
87 | ||
88 | struct configfs_symlink { | |
89 | struct list_head sl_list; | |
90 | struct config_item *sl_target; | |
91 | }; | |
92 | ||
93 | extern int configfs_create_link(struct configfs_symlink *sl, | |
94 | struct dentry *parent, | |
95 | struct dentry *dentry); | |
96 | ||
97 | static inline struct config_item * to_item(struct dentry * dentry) | |
98 | { | |
99 | struct configfs_dirent * sd = dentry->d_fsdata; | |
100 | return ((struct config_item *) sd->s_element); | |
101 | } | |
102 | ||
103 | static inline struct configfs_attribute * to_attr(struct dentry * dentry) | |
104 | { | |
105 | struct configfs_dirent * sd = dentry->d_fsdata; | |
106 | return ((struct configfs_attribute *) sd->s_element); | |
107 | } | |
108 | ||
109 | static inline struct config_item *configfs_get_config_item(struct dentry *dentry) | |
110 | { | |
111 | struct config_item * item = NULL; | |
112 | ||
113 | spin_lock(&dcache_lock); | |
114 | if (!d_unhashed(dentry)) { | |
115 | struct configfs_dirent * sd = dentry->d_fsdata; | |
116 | if (sd->s_type & CONFIGFS_ITEM_LINK) { | |
117 | struct configfs_symlink * sl = sd->s_element; | |
118 | item = config_item_get(sl->sl_target); | |
119 | } else | |
120 | item = config_item_get(sd->s_element); | |
121 | } | |
122 | spin_unlock(&dcache_lock); | |
123 | ||
124 | return item; | |
125 | } | |
126 | ||
127 | static inline void release_configfs_dirent(struct configfs_dirent * sd) | |
128 | { | |
3d0f89bb JB |
129 | if (!(sd->s_type & CONFIGFS_ROOT)) { |
130 | kfree(sd->s_iattr); | |
131 | kmem_cache_free(configfs_dir_cachep, sd); | |
132 | } | |
7063fbf2 JB |
133 | } |
134 | ||
135 | static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd) | |
136 | { | |
137 | if (sd) { | |
138 | WARN_ON(!atomic_read(&sd->s_count)); | |
139 | atomic_inc(&sd->s_count); | |
140 | } | |
141 | return sd; | |
142 | } | |
143 | ||
144 | static inline void configfs_put(struct configfs_dirent * sd) | |
145 | { | |
146 | WARN_ON(!atomic_read(&sd->s_count)); | |
147 | if (atomic_dec_and_test(&sd->s_count)) | |
148 | release_configfs_dirent(sd); | |
149 | } | |
150 |