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328970de | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
7063fbf2 JB |
2 | /* -*- mode: c; c-basic-offset:8; -*- |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * configfs_internal.h - Internal stuff for configfs | |
6 | * | |
7063fbf2 JB |
7 | * Based on sysfs: |
8 | * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel | |
9 | * | |
10 | * configfs Copyright (C) 2005 Oracle. All rights reserved. | |
11 | */ | |
12 | ||
1d88aa44 FF |
13 | #ifdef pr_fmt |
14 | #undef pr_fmt | |
15 | #endif | |
16 | ||
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
18 | ||
7063fbf2 JB |
19 | #include <linux/slab.h> |
20 | #include <linux/list.h> | |
6f610764 | 21 | #include <linux/spinlock.h> |
7063fbf2 JB |
22 | |
23 | struct configfs_dirent { | |
24 | atomic_t s_count; | |
631d1feb | 25 | int s_dependent_count; |
7063fbf2 JB |
26 | struct list_head s_sibling; |
27 | struct list_head s_children; | |
28 | struct list_head s_links; | |
631d1feb | 29 | void * s_element; |
7063fbf2 JB |
30 | int s_type; |
31 | umode_t s_mode; | |
32 | struct dentry * s_dentry; | |
3d0f89bb | 33 | struct iattr * s_iattr; |
e74cc06d LR |
34 | #ifdef CONFIG_LOCKDEP |
35 | int s_depth; | |
36 | #endif | |
7063fbf2 JB |
37 | }; |
38 | ||
39 | #define CONFIGFS_ROOT 0x0001 | |
40 | #define CONFIGFS_DIR 0x0002 | |
631d1feb | 41 | #define CONFIGFS_ITEM_ATTR 0x0004 |
03607ace | 42 | #define CONFIGFS_ITEM_BIN_ATTR 0x0008 |
631d1feb | 43 | #define CONFIGFS_ITEM_LINK 0x0020 |
7063fbf2 JB |
44 | #define CONFIGFS_USET_DIR 0x0040 |
45 | #define CONFIGFS_USET_DEFAULT 0x0080 | |
46 | #define CONFIGFS_USET_DROPPING 0x0100 | |
6d8344ba | 47 | #define CONFIGFS_USET_IN_MKDIR 0x0200 |
2a109f2a | 48 | #define CONFIGFS_USET_CREATING 0x0400 |
03607ace | 49 | #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR) |
7063fbf2 | 50 | |
9a73d78c | 51 | extern struct mutex configfs_symlink_mutex; |
6f610764 LR |
52 | extern spinlock_t configfs_dirent_lock; |
53 | ||
e18b890b | 54 | extern struct kmem_cache *configfs_dir_cachep; |
7063fbf2 JB |
55 | |
56 | extern int configfs_is_root(struct config_item *item); | |
57 | ||
b7c177fc | 58 | extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *); |
c88b1e70 | 59 | extern int configfs_create(struct dentry *, umode_t mode, void (*init)(struct inode *)); |
7063fbf2 JB |
60 | |
61 | extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); | |
03607ace PA |
62 | extern int configfs_create_bin_file(struct config_item *, |
63 | const struct configfs_bin_attribute *); | |
7063fbf2 JB |
64 | extern int configfs_make_dirent(struct configfs_dirent *, |
65 | struct dentry *, void *, umode_t, int); | |
2a109f2a | 66 | extern int configfs_dirent_is_ready(struct configfs_dirent *); |
7063fbf2 | 67 | |
7063fbf2 JB |
68 | extern void configfs_hash_and_remove(struct dentry * dir, const char * name); |
69 | ||
70 | extern const unsigned char * configfs_get_name(struct configfs_dirent *sd); | |
71 | extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent); | |
3d0f89bb | 72 | extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr); |
7063fbf2 | 73 | |
2a152ad3 | 74 | extern struct dentry *configfs_pin_fs(void); |
7063fbf2 JB |
75 | extern void configfs_release_fs(void); |
76 | ||
77 | extern struct rw_semaphore configfs_rename_sem; | |
4b6f5d20 AV |
78 | extern const struct file_operations configfs_dir_operations; |
79 | extern const struct file_operations configfs_file_operations; | |
03607ace | 80 | extern const struct file_operations configfs_bin_file_operations; |
754661f1 | 81 | extern const struct inode_operations configfs_dir_inode_operations; |
81d44ed1 | 82 | extern const struct inode_operations configfs_root_inode_operations; |
754661f1 | 83 | extern const struct inode_operations configfs_symlink_inode_operations; |
d463a0c4 | 84 | extern const struct dentry_operations configfs_dentry_ops; |
7063fbf2 JB |
85 | |
86 | extern int configfs_symlink(struct inode *dir, struct dentry *dentry, | |
87 | const char *symname); | |
88 | extern int configfs_unlink(struct inode *dir, struct dentry *dentry); | |
89 | ||
90 | struct configfs_symlink { | |
91 | struct list_head sl_list; | |
92 | struct config_item *sl_target; | |
93 | }; | |
94 | ||
95 | extern int configfs_create_link(struct configfs_symlink *sl, | |
96 | struct dentry *parent, | |
97 | struct dentry *dentry); | |
98 | ||
99 | static inline struct config_item * to_item(struct dentry * dentry) | |
100 | { | |
101 | struct configfs_dirent * sd = dentry->d_fsdata; | |
102 | return ((struct config_item *) sd->s_element); | |
103 | } | |
104 | ||
105 | static inline struct configfs_attribute * to_attr(struct dentry * dentry) | |
106 | { | |
107 | struct configfs_dirent * sd = dentry->d_fsdata; | |
108 | return ((struct configfs_attribute *) sd->s_element); | |
109 | } | |
110 | ||
03607ace PA |
111 | static inline struct configfs_bin_attribute *to_bin_attr(struct dentry *dentry) |
112 | { | |
113 | struct configfs_attribute *attr = to_attr(dentry); | |
114 | ||
115 | return container_of(attr, struct configfs_bin_attribute, cb_attr); | |
116 | } | |
117 | ||
7063fbf2 JB |
118 | static inline struct config_item *configfs_get_config_item(struct dentry *dentry) |
119 | { | |
120 | struct config_item * item = NULL; | |
121 | ||
da502956 | 122 | spin_lock(&dentry->d_lock); |
7063fbf2 JB |
123 | if (!d_unhashed(dentry)) { |
124 | struct configfs_dirent * sd = dentry->d_fsdata; | |
125 | if (sd->s_type & CONFIGFS_ITEM_LINK) { | |
126 | struct configfs_symlink * sl = sd->s_element; | |
127 | item = config_item_get(sl->sl_target); | |
128 | } else | |
129 | item = config_item_get(sd->s_element); | |
130 | } | |
da502956 | 131 | spin_unlock(&dentry->d_lock); |
7063fbf2 JB |
132 | |
133 | return item; | |
134 | } | |
135 | ||
136 | static inline void release_configfs_dirent(struct configfs_dirent * sd) | |
137 | { | |
3d0f89bb JB |
138 | if (!(sd->s_type & CONFIGFS_ROOT)) { |
139 | kfree(sd->s_iattr); | |
140 | kmem_cache_free(configfs_dir_cachep, sd); | |
141 | } | |
7063fbf2 JB |
142 | } |
143 | ||
144 | static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd) | |
145 | { | |
146 | if (sd) { | |
147 | WARN_ON(!atomic_read(&sd->s_count)); | |
148 | atomic_inc(&sd->s_count); | |
149 | } | |
150 | return sd; | |
151 | } | |
152 | ||
153 | static inline void configfs_put(struct configfs_dirent * sd) | |
154 | { | |
155 | WARN_ON(!atomic_read(&sd->s_count)); | |
156 | if (atomic_dec_and_test(&sd->s_count)) | |
157 | release_configfs_dirent(sd); | |
158 | } | |
159 |