mm/memunmap: don't access uninitialized memmap in memunmap_pages()
[linux-2.6-block.git] / fs / configfs / configfs_internal.h
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328970de 1/* SPDX-License-Identifier: GPL-2.0-or-later */
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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 *
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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
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13#ifdef pr_fmt
14#undef pr_fmt
15#endif
16
17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
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19#include <linux/slab.h>
20#include <linux/list.h>
6f610764 21#include <linux/spinlock.h>
7063fbf2 22
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23struct configfs_fragment {
24 atomic_t frag_count;
25 struct rw_semaphore frag_sem;
26 bool frag_dead;
27};
28
29void put_fragment(struct configfs_fragment *);
30struct configfs_fragment *get_fragment(struct configfs_fragment *);
31
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32struct configfs_dirent {
33 atomic_t s_count;
631d1feb 34 int s_dependent_count;
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35 struct list_head s_sibling;
36 struct list_head s_children;
e9c03af2 37 int s_links;
631d1feb 38 void * s_element;
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39 int s_type;
40 umode_t s_mode;
41 struct dentry * s_dentry;
3d0f89bb 42 struct iattr * s_iattr;
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43#ifdef CONFIG_LOCKDEP
44 int s_depth;
45#endif
47320fbe 46 struct configfs_fragment *s_frag;
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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
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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 61extern struct mutex configfs_symlink_mutex;
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62extern spinlock_t configfs_dirent_lock;
63
e18b890b 64extern struct kmem_cache *configfs_dir_cachep;
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65
66extern int configfs_is_root(struct config_item *item);
67
b7c177fc 68extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
2743c515 69extern struct inode *configfs_create(struct dentry *, umode_t mode);
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70
71extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
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72extern int configfs_create_bin_file(struct config_item *,
73 const struct configfs_bin_attribute *);
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74extern int configfs_make_dirent(struct configfs_dirent *, struct dentry *,
75 void *, umode_t, int, struct configfs_fragment *);
2a109f2a 76extern int configfs_dirent_is_ready(struct configfs_dirent *);
7063fbf2 77
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78extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
79
80extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
81extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
3d0f89bb 82extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
7063fbf2 83
2a152ad3 84extern struct dentry *configfs_pin_fs(void);
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85extern void configfs_release_fs(void);
86
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87extern const struct file_operations configfs_dir_operations;
88extern const struct file_operations configfs_file_operations;
03607ace 89extern const struct file_operations configfs_bin_file_operations;
754661f1 90extern const struct inode_operations configfs_dir_inode_operations;
81d44ed1 91extern const struct inode_operations configfs_root_inode_operations;
754661f1 92extern const struct inode_operations configfs_symlink_inode_operations;
d463a0c4 93extern const struct dentry_operations configfs_dentry_ops;
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94
95extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
96 const char *symname);
97extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
98
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99int configfs_create_link(struct configfs_dirent *target, struct dentry *parent,
100 struct dentry *dentry, char *body);
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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
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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
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121static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
122{
123 struct config_item * item = NULL;
124
da502956 125 spin_lock(&dentry->d_lock);
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126 if (!d_unhashed(dentry)) {
127 struct configfs_dirent * sd = dentry->d_fsdata;
e9c03af2 128 item = config_item_get(sd->s_element);
7063fbf2 129 }
da502956 130 spin_unlock(&dentry->d_lock);
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131
132 return item;
133}
134
135static inline void release_configfs_dirent(struct configfs_dirent * sd)
136{
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137 if (!(sd->s_type & CONFIGFS_ROOT)) {
138 kfree(sd->s_iattr);
47320fbe 139 put_fragment(sd->s_frag);
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140 kmem_cache_free(configfs_dir_cachep, sd);
141 }
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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