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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> | |
6f610764 | 29 | #include <linux/spinlock.h> |
7063fbf2 JB |
30 | |
31 | struct configfs_dirent { | |
32 | atomic_t s_count; | |
631d1feb | 33 | int s_dependent_count; |
7063fbf2 JB |
34 | struct list_head s_sibling; |
35 | struct list_head s_children; | |
36 | struct list_head s_links; | |
631d1feb | 37 | void * s_element; |
7063fbf2 JB |
38 | int s_type; |
39 | umode_t s_mode; | |
40 | struct dentry * s_dentry; | |
3d0f89bb | 41 | struct iattr * s_iattr; |
7063fbf2 JB |
42 | }; |
43 | ||
44 | #define CONFIGFS_ROOT 0x0001 | |
45 | #define CONFIGFS_DIR 0x0002 | |
631d1feb JB |
46 | #define CONFIGFS_ITEM_ATTR 0x0004 |
47 | #define CONFIGFS_ITEM_LINK 0x0020 | |
7063fbf2 JB |
48 | #define CONFIGFS_USET_DIR 0x0040 |
49 | #define CONFIGFS_USET_DEFAULT 0x0080 | |
50 | #define CONFIGFS_USET_DROPPING 0x0100 | |
6d8344ba | 51 | #define CONFIGFS_USET_IN_MKDIR 0x0200 |
7063fbf2 JB |
52 | #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR) |
53 | ||
9a73d78c | 54 | extern struct mutex configfs_symlink_mutex; |
6f610764 LR |
55 | extern spinlock_t configfs_dirent_lock; |
56 | ||
7063fbf2 | 57 | extern struct vfsmount * configfs_mount; |
e18b890b | 58 | extern struct kmem_cache *configfs_dir_cachep; |
7063fbf2 JB |
59 | |
60 | extern int configfs_is_root(struct config_item *item); | |
61 | ||
3d0f89bb | 62 | extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *); |
7063fbf2 | 63 | extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *)); |
e0bf68dd PZ |
64 | extern int configfs_inode_init(void); |
65 | extern void configfs_inode_exit(void); | |
7063fbf2 JB |
66 | |
67 | extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); | |
68 | extern int configfs_make_dirent(struct configfs_dirent *, | |
69 | struct dentry *, void *, umode_t, int); | |
70 | ||
71 | extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int); | |
72 | extern void configfs_hash_and_remove(struct dentry * dir, const char * name); | |
73 | ||
74 | extern const unsigned char * configfs_get_name(struct configfs_dirent *sd); | |
75 | extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent); | |
3d0f89bb | 76 | extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr); |
7063fbf2 JB |
77 | |
78 | extern int configfs_pin_fs(void); | |
79 | extern void configfs_release_fs(void); | |
80 | ||
81 | extern struct rw_semaphore configfs_rename_sem; | |
82 | extern struct super_block * configfs_sb; | |
4b6f5d20 AV |
83 | extern const struct file_operations configfs_dir_operations; |
84 | extern const struct file_operations configfs_file_operations; | |
85 | extern const struct file_operations bin_fops; | |
754661f1 AV |
86 | extern const struct inode_operations configfs_dir_inode_operations; |
87 | extern const struct inode_operations configfs_symlink_inode_operations; | |
7063fbf2 JB |
88 | |
89 | extern int configfs_symlink(struct inode *dir, struct dentry *dentry, | |
90 | const char *symname); | |
91 | extern int configfs_unlink(struct inode *dir, struct dentry *dentry); | |
92 | ||
93 | struct configfs_symlink { | |
94 | struct list_head sl_list; | |
95 | struct config_item *sl_target; | |
96 | }; | |
97 | ||
98 | extern int configfs_create_link(struct configfs_symlink *sl, | |
99 | struct dentry *parent, | |
100 | struct dentry *dentry); | |
101 | ||
102 | static inline struct config_item * to_item(struct dentry * dentry) | |
103 | { | |
104 | struct configfs_dirent * sd = dentry->d_fsdata; | |
105 | return ((struct config_item *) sd->s_element); | |
106 | } | |
107 | ||
108 | static inline struct configfs_attribute * to_attr(struct dentry * dentry) | |
109 | { | |
110 | struct configfs_dirent * sd = dentry->d_fsdata; | |
111 | return ((struct configfs_attribute *) sd->s_element); | |
112 | } | |
113 | ||
114 | static inline struct config_item *configfs_get_config_item(struct dentry *dentry) | |
115 | { | |
116 | struct config_item * item = NULL; | |
117 | ||
118 | spin_lock(&dcache_lock); | |
119 | if (!d_unhashed(dentry)) { | |
120 | struct configfs_dirent * sd = dentry->d_fsdata; | |
121 | if (sd->s_type & CONFIGFS_ITEM_LINK) { | |
122 | struct configfs_symlink * sl = sd->s_element; | |
123 | item = config_item_get(sl->sl_target); | |
124 | } else | |
125 | item = config_item_get(sd->s_element); | |
126 | } | |
127 | spin_unlock(&dcache_lock); | |
128 | ||
129 | return item; | |
130 | } | |
131 | ||
132 | static inline void release_configfs_dirent(struct configfs_dirent * sd) | |
133 | { | |
3d0f89bb JB |
134 | if (!(sd->s_type & CONFIGFS_ROOT)) { |
135 | kfree(sd->s_iattr); | |
136 | kmem_cache_free(configfs_dir_cachep, sd); | |
137 | } | |
7063fbf2 JB |
138 | } |
139 | ||
140 | static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd) | |
141 | { | |
142 | if (sd) { | |
143 | WARN_ON(!atomic_read(&sd->s_count)); | |
144 | atomic_inc(&sd->s_count); | |
145 | } | |
146 | return sd; | |
147 | } | |
148 | ||
149 | static inline void configfs_put(struct configfs_dirent * sd) | |
150 | { | |
151 | WARN_ON(!atomic_read(&sd->s_count)); | |
152 | if (atomic_dec_and_test(&sd->s_count)) | |
153 | release_configfs_dirent(sd); | |
154 | } | |
155 |