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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 | 22 | |
47320fbe AV |
23 | struct configfs_fragment { |
24 | atomic_t frag_count; | |
25 | struct rw_semaphore frag_sem; | |
26 | bool frag_dead; | |
27 | }; | |
28 | ||
29 | void put_fragment(struct configfs_fragment *); | |
30 | struct configfs_fragment *get_fragment(struct configfs_fragment *); | |
31 | ||
7063fbf2 JB |
32 | struct configfs_dirent { |
33 | atomic_t s_count; | |
631d1feb | 34 | int s_dependent_count; |
7063fbf2 JB |
35 | struct list_head s_sibling; |
36 | struct list_head s_children; | |
e9c03af2 | 37 | int s_links; |
631d1feb | 38 | void * s_element; |
7063fbf2 JB |
39 | int s_type; |
40 | umode_t s_mode; | |
41 | struct dentry * s_dentry; | |
3d0f89bb | 42 | struct iattr * s_iattr; |
e74cc06d LR |
43 | #ifdef CONFIG_LOCKDEP |
44 | int s_depth; | |
45 | #endif | |
47320fbe | 46 | struct configfs_fragment *s_frag; |
7063fbf2 JB |
47 | }; |
48 | ||
49 | #define CONFIGFS_ROOT 0x0001 | |
50 | #define CONFIGFS_DIR 0x0002 | |
631d1feb | 51 | #define CONFIGFS_ITEM_ATTR 0x0004 |
03607ace | 52 | #define CONFIGFS_ITEM_BIN_ATTR 0x0008 |
631d1feb | 53 | #define CONFIGFS_ITEM_LINK 0x0020 |
7063fbf2 JB |
54 | #define CONFIGFS_USET_DIR 0x0040 |
55 | #define CONFIGFS_USET_DEFAULT 0x0080 | |
56 | #define CONFIGFS_USET_DROPPING 0x0100 | |
6d8344ba | 57 | #define CONFIGFS_USET_IN_MKDIR 0x0200 |
2a109f2a | 58 | #define CONFIGFS_USET_CREATING 0x0400 |
03607ace | 59 | #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR) |
7063fbf2 | 60 | |
9a73d78c | 61 | extern struct mutex configfs_symlink_mutex; |
6f610764 LR |
62 | extern spinlock_t configfs_dirent_lock; |
63 | ||
e18b890b | 64 | extern struct kmem_cache *configfs_dir_cachep; |
7063fbf2 JB |
65 | |
66 | extern int configfs_is_root(struct config_item *item); | |
67 | ||
b7c177fc | 68 | extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *); |
2743c515 | 69 | extern struct inode *configfs_create(struct dentry *, umode_t mode); |
7063fbf2 JB |
70 | |
71 | extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); | |
03607ace PA |
72 | extern int configfs_create_bin_file(struct config_item *, |
73 | const struct configfs_bin_attribute *); | |
47320fbe AV |
74 | extern int configfs_make_dirent(struct configfs_dirent *, struct dentry *, |
75 | void *, umode_t, int, struct configfs_fragment *); | |
2a109f2a | 76 | extern int configfs_dirent_is_ready(struct configfs_dirent *); |
7063fbf2 | 77 | |
7063fbf2 JB |
78 | extern void configfs_hash_and_remove(struct dentry * dir, const char * name); |
79 | ||
80 | extern const unsigned char * configfs_get_name(struct configfs_dirent *sd); | |
81 | extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent); | |
549c7297 CB |
82 | extern int configfs_setattr(struct user_namespace *mnt_userns, |
83 | struct dentry *dentry, struct iattr *iattr); | |
7063fbf2 | 84 | |
2a152ad3 | 85 | extern struct dentry *configfs_pin_fs(void); |
7063fbf2 JB |
86 | extern void configfs_release_fs(void); |
87 | ||
4b6f5d20 AV |
88 | extern const struct file_operations configfs_dir_operations; |
89 | extern const struct file_operations configfs_file_operations; | |
03607ace | 90 | extern const struct file_operations configfs_bin_file_operations; |
754661f1 | 91 | extern const struct inode_operations configfs_dir_inode_operations; |
81d44ed1 | 92 | extern const struct inode_operations configfs_root_inode_operations; |
754661f1 | 93 | extern const struct inode_operations configfs_symlink_inode_operations; |
d463a0c4 | 94 | extern const struct dentry_operations configfs_dentry_ops; |
7063fbf2 | 95 | |
549c7297 CB |
96 | extern int configfs_symlink(struct user_namespace *mnt_userns, |
97 | struct inode *dir, struct dentry *dentry, | |
7063fbf2 JB |
98 | const char *symname); |
99 | extern int configfs_unlink(struct inode *dir, struct dentry *dentry); | |
100 | ||
e9c03af2 AV |
101 | int configfs_create_link(struct configfs_dirent *target, struct dentry *parent, |
102 | struct dentry *dentry, char *body); | |
7063fbf2 JB |
103 | |
104 | static inline struct config_item * to_item(struct dentry * dentry) | |
105 | { | |
106 | struct configfs_dirent * sd = dentry->d_fsdata; | |
107 | return ((struct config_item *) sd->s_element); | |
108 | } | |
109 | ||
110 | static inline struct configfs_attribute * to_attr(struct dentry * dentry) | |
111 | { | |
112 | struct configfs_dirent * sd = dentry->d_fsdata; | |
113 | return ((struct configfs_attribute *) sd->s_element); | |
114 | } | |
115 | ||
03607ace PA |
116 | static inline struct configfs_bin_attribute *to_bin_attr(struct dentry *dentry) |
117 | { | |
118 | struct configfs_attribute *attr = to_attr(dentry); | |
119 | ||
120 | return container_of(attr, struct configfs_bin_attribute, cb_attr); | |
121 | } | |
122 | ||
7063fbf2 JB |
123 | static inline struct config_item *configfs_get_config_item(struct dentry *dentry) |
124 | { | |
125 | struct config_item * item = NULL; | |
126 | ||
da502956 | 127 | spin_lock(&dentry->d_lock); |
7063fbf2 JB |
128 | if (!d_unhashed(dentry)) { |
129 | struct configfs_dirent * sd = dentry->d_fsdata; | |
e9c03af2 | 130 | item = config_item_get(sd->s_element); |
7063fbf2 | 131 | } |
da502956 | 132 | spin_unlock(&dentry->d_lock); |
7063fbf2 JB |
133 | |
134 | return item; | |
135 | } | |
136 | ||
137 | static inline void release_configfs_dirent(struct configfs_dirent * sd) | |
138 | { | |
3d0f89bb JB |
139 | if (!(sd->s_type & CONFIGFS_ROOT)) { |
140 | kfree(sd->s_iattr); | |
47320fbe | 141 | put_fragment(sd->s_frag); |
3d0f89bb JB |
142 | kmem_cache_free(configfs_dir_cachep, sd); |
143 | } | |
7063fbf2 JB |
144 | } |
145 | ||
146 | static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd) | |
147 | { | |
148 | if (sd) { | |
149 | WARN_ON(!atomic_read(&sd->s_count)); | |
150 | atomic_inc(&sd->s_count); | |
151 | } | |
152 | return sd; | |
153 | } | |
154 | ||
155 | static inline void configfs_put(struct configfs_dirent * sd) | |
156 | { | |
157 | WARN_ON(!atomic_read(&sd->s_count)); | |
158 | if (atomic_dec_and_test(&sd->s_count)) | |
159 | release_configfs_dirent(sd); | |
160 | } | |
161 |