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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * configfs_internal.h - Internal stuff for configfs
4 *
5 * Based on sysfs:
6 * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
7 *
8 * configfs Copyright (C) 2005 Oracle. All rights reserved.
9 */
10
11#ifdef pr_fmt
12#undef pr_fmt
13#endif
14
15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17#include <linux/slab.h>
18#include <linux/list.h>
19#include <linux/spinlock.h>
20
21struct configfs_fragment {
22 atomic_t frag_count;
23 struct rw_semaphore frag_sem;
24 bool frag_dead;
25};
26
27void put_fragment(struct configfs_fragment *);
28struct configfs_fragment *get_fragment(struct configfs_fragment *);
29
30struct configfs_dirent {
31 atomic_t s_count;
32 int s_dependent_count;
33 struct list_head s_sibling;
34 struct list_head s_children;
35 int s_links;
36 void * s_element;
37 int s_type;
38 umode_t s_mode;
39 struct dentry * s_dentry;
40 struct iattr * s_iattr;
41#ifdef CONFIG_LOCKDEP
42 int s_depth;
43#endif
44 struct configfs_fragment *s_frag;
45};
46
47#define CONFIGFS_ROOT 0x0001
48#define CONFIGFS_DIR 0x0002
49#define CONFIGFS_ITEM_ATTR 0x0004
50#define CONFIGFS_ITEM_BIN_ATTR 0x0008
51#define CONFIGFS_ITEM_LINK 0x0020
52#define CONFIGFS_USET_DIR 0x0040
53#define CONFIGFS_USET_DEFAULT 0x0080
54#define CONFIGFS_USET_DROPPING 0x0100
55#define CONFIGFS_USET_IN_MKDIR 0x0200
56#define CONFIGFS_USET_CREATING 0x0400
57#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR)
58#define CONFIGFS_PINNED \
59 (CONFIGFS_ROOT | CONFIGFS_DIR | CONFIGFS_ITEM_LINK)
60
61extern struct mutex configfs_symlink_mutex;
62extern spinlock_t configfs_dirent_lock;
63
64extern struct kmem_cache *configfs_dir_cachep;
65
66extern int configfs_is_root(struct config_item *item);
67
68extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
69extern struct inode *configfs_create(struct dentry *, umode_t mode);
70
71extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
72extern int configfs_create_bin_file(struct config_item *,
73 const struct configfs_bin_attribute *);
74extern int configfs_make_dirent(struct configfs_dirent *, struct dentry *,
75 void *, umode_t, int, struct configfs_fragment *);
76extern int configfs_dirent_is_ready(struct configfs_dirent *);
77
78extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
79extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
80extern int configfs_setattr(struct mnt_idmap *idmap,
81 struct dentry *dentry, struct iattr *iattr);
82
83extern struct dentry *configfs_pin_fs(void);
84extern void configfs_release_fs(void);
85
86extern const struct file_operations configfs_dir_operations;
87extern const struct file_operations configfs_file_operations;
88extern const struct file_operations configfs_bin_file_operations;
89extern const struct inode_operations configfs_dir_inode_operations;
90extern const struct inode_operations configfs_root_inode_operations;
91extern const struct inode_operations configfs_symlink_inode_operations;
92extern const struct dentry_operations configfs_dentry_ops;
93
94extern int configfs_symlink(struct mnt_idmap *idmap,
95 struct inode *dir, struct dentry *dentry,
96 const char *symname);
97extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
98
99int configfs_create_link(struct configfs_dirent *target, struct dentry *parent,
100 struct dentry *dentry, char *body);
101
102static 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
108static 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
114static inline struct configfs_bin_attribute *to_bin_attr(struct dentry *dentry)
115{
116 struct configfs_attribute *attr = to_attr(dentry);
117
118 return container_of(attr, struct configfs_bin_attribute, cb_attr);
119}
120
121static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
122{
123 struct config_item * item = NULL;
124
125 spin_lock(&dentry->d_lock);
126 if (!d_unhashed(dentry)) {
127 struct configfs_dirent * sd = dentry->d_fsdata;
128 item = config_item_get(sd->s_element);
129 }
130 spin_unlock(&dentry->d_lock);
131
132 return item;
133}
134
135static inline void release_configfs_dirent(struct configfs_dirent * sd)
136{
137 if (!(sd->s_type & CONFIGFS_ROOT)) {
138 kfree(sd->s_iattr);
139 put_fragment(sd->s_frag);
140 kmem_cache_free(configfs_dir_cachep, sd);
141 }
142}
143
144static 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
153static 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
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#include <linux/spinlock.h>
30
31struct configfs_dirent {
32 atomic_t s_count;
33 int s_dependent_count;
34 struct list_head s_sibling;
35 struct list_head s_children;
36 struct list_head s_links;
37 void * s_element;
38 int s_type;
39 umode_t s_mode;
40 struct dentry * s_dentry;
41 struct iattr * s_iattr;
42#ifdef CONFIG_LOCKDEP
43 int s_depth;
44#endif
45};
46
47#define CONFIGFS_ROOT 0x0001
48#define CONFIGFS_DIR 0x0002
49#define CONFIGFS_ITEM_ATTR 0x0004
50#define CONFIGFS_ITEM_LINK 0x0020
51#define CONFIGFS_USET_DIR 0x0040
52#define CONFIGFS_USET_DEFAULT 0x0080
53#define CONFIGFS_USET_DROPPING 0x0100
54#define CONFIGFS_USET_IN_MKDIR 0x0200
55#define CONFIGFS_USET_CREATING 0x0400
56#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR)
57
58extern struct mutex configfs_symlink_mutex;
59extern spinlock_t configfs_dirent_lock;
60
61extern struct kmem_cache *configfs_dir_cachep;
62
63extern int configfs_is_root(struct config_item *item);
64
65extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
66extern int configfs_create(struct dentry *, umode_t mode, int (*init)(struct inode *));
67extern int configfs_inode_init(void);
68extern void configfs_inode_exit(void);
69
70extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
71extern int configfs_make_dirent(struct configfs_dirent *,
72 struct dentry *, void *, umode_t, int);
73extern int configfs_dirent_is_ready(struct configfs_dirent *);
74
75extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int);
76extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
77
78extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
79extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
80extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
81
82extern struct dentry *configfs_pin_fs(void);
83extern void configfs_release_fs(void);
84
85extern struct rw_semaphore configfs_rename_sem;
86extern const struct file_operations configfs_dir_operations;
87extern const struct file_operations configfs_file_operations;
88extern const struct file_operations bin_fops;
89extern const struct inode_operations configfs_dir_inode_operations;
90extern const struct inode_operations configfs_root_inode_operations;
91extern const struct inode_operations configfs_symlink_inode_operations;
92extern const struct dentry_operations configfs_dentry_ops;
93
94extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
95 const char *symname);
96extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
97
98struct configfs_symlink {
99 struct list_head sl_list;
100 struct config_item *sl_target;
101};
102
103extern int configfs_create_link(struct configfs_symlink *sl,
104 struct dentry *parent,
105 struct dentry *dentry);
106
107static inline struct config_item * to_item(struct dentry * dentry)
108{
109 struct configfs_dirent * sd = dentry->d_fsdata;
110 return ((struct config_item *) sd->s_element);
111}
112
113static inline struct configfs_attribute * to_attr(struct dentry * dentry)
114{
115 struct configfs_dirent * sd = dentry->d_fsdata;
116 return ((struct configfs_attribute *) sd->s_element);
117}
118
119static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
120{
121 struct config_item * item = NULL;
122
123 spin_lock(&dentry->d_lock);
124 if (!d_unhashed(dentry)) {
125 struct configfs_dirent * sd = dentry->d_fsdata;
126 if (sd->s_type & CONFIGFS_ITEM_LINK) {
127 struct configfs_symlink * sl = sd->s_element;
128 item = config_item_get(sl->sl_target);
129 } else
130 item = config_item_get(sd->s_element);
131 }
132 spin_unlock(&dentry->d_lock);
133
134 return item;
135}
136
137static inline void release_configfs_dirent(struct configfs_dirent * sd)
138{
139 if (!(sd->s_type & CONFIGFS_ROOT)) {
140 kfree(sd->s_iattr);
141 kmem_cache_free(configfs_dir_cachep, sd);
142 }
143}
144
145static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
146{
147 if (sd) {
148 WARN_ON(!atomic_read(&sd->s_count));
149 atomic_inc(&sd->s_count);
150 }
151 return sd;
152}
153
154static inline void configfs_put(struct configfs_dirent * sd)
155{
156 WARN_ON(!atomic_read(&sd->s_count));
157 if (atomic_dec_and_test(&sd->s_count))
158 release_configfs_dirent(sd);
159}
160