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Joel Becker7063fbf2005-12-15 14:29:43 -08001/* -*- 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
Fabian Frederick1d88aa42014-06-04 16:05:59 -070027#ifdef pr_fmt
28#undef pr_fmt
29#endif
30
31#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32
Joel Becker7063fbf2005-12-15 14:29:43 -080033#include <linux/slab.h>
34#include <linux/list.h>
Louis Rilling6f610762008-06-16 19:00:58 +020035#include <linux/spinlock.h>
Joel Becker7063fbf2005-12-15 14:29:43 -080036
37struct configfs_dirent {
38 atomic_t s_count;
Joel Becker631d1fe2007-06-18 18:06:09 -070039 int s_dependent_count;
Joel Becker7063fbf2005-12-15 14:29:43 -080040 struct list_head s_sibling;
41 struct list_head s_children;
42 struct list_head s_links;
Joel Becker631d1fe2007-06-18 18:06:09 -070043 void * s_element;
Joel Becker7063fbf2005-12-15 14:29:43 -080044 int s_type;
45 umode_t s_mode;
46 struct dentry * s_dentry;
Joel Becker3d0f89b2006-01-25 13:31:07 -080047 struct iattr * s_iattr;
Louis Rillinge74cc062009-01-28 19:18:32 +010048#ifdef CONFIG_LOCKDEP
49 int s_depth;
50#endif
Joel Becker7063fbf2005-12-15 14:29:43 -080051};
52
53#define CONFIGFS_ROOT 0x0001
54#define CONFIGFS_DIR 0x0002
Joel Becker631d1fe2007-06-18 18:06:09 -070055#define CONFIGFS_ITEM_ATTR 0x0004
56#define CONFIGFS_ITEM_LINK 0x0020
Joel Becker7063fbf2005-12-15 14:29:43 -080057#define CONFIGFS_USET_DIR 0x0040
58#define CONFIGFS_USET_DEFAULT 0x0080
59#define CONFIGFS_USET_DROPPING 0x0100
Louis Rilling6d8344b2008-06-16 19:01:02 +020060#define CONFIGFS_USET_IN_MKDIR 0x0200
Louis Rilling2a109f22008-07-04 16:56:05 +020061#define CONFIGFS_USET_CREATING 0x0400
Joel Becker7063fbf2005-12-15 14:29:43 -080062#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR)
63
Louis Rilling9a73d782008-06-20 14:09:22 +020064extern struct mutex configfs_symlink_mutex;
Louis Rilling6f610762008-06-16 19:00:58 +020065extern spinlock_t configfs_dirent_lock;
66
Christoph Lametere18b8902006-12-06 20:33:20 -080067extern struct kmem_cache *configfs_dir_cachep;
Joel Becker7063fbf2005-12-15 14:29:43 -080068
69extern int configfs_is_root(struct config_item *item);
70
Al Virob7c177f2012-03-17 16:24:54 -040071extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
Al Viroc88b1e72015-01-29 00:17:57 -050072extern int configfs_create(struct dentry *, umode_t mode, void (*init)(struct inode *));
Joel Becker7063fbf2005-12-15 14:29:43 -080073
74extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
75extern int configfs_make_dirent(struct configfs_dirent *,
76 struct dentry *, void *, umode_t, int);
Louis Rilling2a109f22008-07-04 16:56:05 +020077extern int configfs_dirent_is_ready(struct configfs_dirent *);
Joel Becker7063fbf2005-12-15 14:29:43 -080078
Joel Becker7063fbf2005-12-15 14:29:43 -080079extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
80
81extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
82extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
Joel Becker3d0f89b2006-01-25 13:31:07 -080083extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
Joel Becker7063fbf2005-12-15 14:29:43 -080084
Al Viro2a152ad2012-03-17 16:53:29 -040085extern struct dentry *configfs_pin_fs(void);
Joel Becker7063fbf2005-12-15 14:29:43 -080086extern void configfs_release_fs(void);
87
88extern struct rw_semaphore configfs_rename_sem;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080089extern const struct file_operations configfs_dir_operations;
90extern const struct file_operations configfs_file_operations;
91extern const struct file_operations bin_fops;
Arjan van de Ven754661f2007-02-12 00:55:38 -080092extern const struct inode_operations configfs_dir_inode_operations;
Al Viro81d44ed12012-03-17 16:13:25 -040093extern const struct inode_operations configfs_root_inode_operations;
Arjan van de Ven754661f2007-02-12 00:55:38 -080094extern const struct inode_operations configfs_symlink_inode_operations;
Al Virod463a0c2011-01-12 16:41:05 -050095extern const struct dentry_operations configfs_dentry_ops;
Joel Becker7063fbf2005-12-15 14:29:43 -080096
97extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
98 const char *symname);
99extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
100
101struct configfs_symlink {
102 struct list_head sl_list;
103 struct config_item *sl_target;
104};
105
106extern int configfs_create_link(struct configfs_symlink *sl,
107 struct dentry *parent,
108 struct dentry *dentry);
109
110static inline struct config_item * to_item(struct dentry * dentry)
111{
112 struct configfs_dirent * sd = dentry->d_fsdata;
113 return ((struct config_item *) sd->s_element);
114}
115
116static inline struct configfs_attribute * to_attr(struct dentry * dentry)
117{
118 struct configfs_dirent * sd = dentry->d_fsdata;
119 return ((struct configfs_attribute *) sd->s_element);
120}
121
122static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
123{
124 struct config_item * item = NULL;
125
Nick Pigginda502952011-01-07 17:49:33 +1100126 spin_lock(&dentry->d_lock);
Joel Becker7063fbf2005-12-15 14:29:43 -0800127 if (!d_unhashed(dentry)) {
128 struct configfs_dirent * sd = dentry->d_fsdata;
129 if (sd->s_type & CONFIGFS_ITEM_LINK) {
130 struct configfs_symlink * sl = sd->s_element;
131 item = config_item_get(sl->sl_target);
132 } else
133 item = config_item_get(sd->s_element);
134 }
Nick Pigginda502952011-01-07 17:49:33 +1100135 spin_unlock(&dentry->d_lock);
Joel Becker7063fbf2005-12-15 14:29:43 -0800136
137 return item;
138}
139
140static inline void release_configfs_dirent(struct configfs_dirent * sd)
141{
Joel Becker3d0f89b2006-01-25 13:31:07 -0800142 if (!(sd->s_type & CONFIGFS_ROOT)) {
143 kfree(sd->s_iattr);
144 kmem_cache_free(configfs_dir_cachep, sd);
145 }
Joel Becker7063fbf2005-12-15 14:29:43 -0800146}
147
148static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
149{
150 if (sd) {
151 WARN_ON(!atomic_read(&sd->s_count));
152 atomic_inc(&sd->s_count);
153 }
154 return sd;
155}
156
157static inline void configfs_put(struct configfs_dirent * sd)
158{
159 WARN_ON(!atomic_read(&sd->s_count));
160 if (atomic_dec_and_test(&sd->s_count))
161 release_configfs_dirent(sd);
162}
163