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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
27#include <linux/slab.h>
28#include <linux/list.h>
Louis Rilling6f610762008-06-16 19:00:58 +020029#include <linux/spinlock.h>
Joel Becker7063fbf2005-12-15 14:29:43 -080030
31struct configfs_dirent {
32 atomic_t s_count;
Joel Becker631d1fe2007-06-18 18:06:09 -070033 int s_dependent_count;
Joel Becker7063fbf2005-12-15 14:29:43 -080034 struct list_head s_sibling;
35 struct list_head s_children;
36 struct list_head s_links;
Joel Becker631d1fe2007-06-18 18:06:09 -070037 void * s_element;
Joel Becker7063fbf2005-12-15 14:29:43 -080038 int s_type;
39 umode_t s_mode;
40 struct dentry * s_dentry;
Joel Becker3d0f89b2006-01-25 13:31:07 -080041 struct iattr * s_iattr;
Louis Rillinge74cc062009-01-28 19:18:32 +010042#ifdef CONFIG_LOCKDEP
43 int s_depth;
44#endif
Joel Becker7063fbf2005-12-15 14:29:43 -080045};
46
47#define CONFIGFS_ROOT 0x0001
48#define CONFIGFS_DIR 0x0002
Joel Becker631d1fe2007-06-18 18:06:09 -070049#define CONFIGFS_ITEM_ATTR 0x0004
50#define CONFIGFS_ITEM_LINK 0x0020
Joel Becker7063fbf2005-12-15 14:29:43 -080051#define CONFIGFS_USET_DIR 0x0040
52#define CONFIGFS_USET_DEFAULT 0x0080
53#define CONFIGFS_USET_DROPPING 0x0100
Louis Rilling6d8344b2008-06-16 19:01:02 +020054#define CONFIGFS_USET_IN_MKDIR 0x0200
Louis Rilling2a109f22008-07-04 16:56:05 +020055#define CONFIGFS_USET_CREATING 0x0400
Joel Becker7063fbf2005-12-15 14:29:43 -080056#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR)
57
Louis Rilling9a73d782008-06-20 14:09:22 +020058extern struct mutex configfs_symlink_mutex;
Louis Rilling6f610762008-06-16 19:00:58 +020059extern spinlock_t configfs_dirent_lock;
60
Joel Becker7063fbf2005-12-15 14:29:43 -080061extern struct vfsmount * configfs_mount;
Christoph Lametere18b8902006-12-06 20:33:20 -080062extern struct kmem_cache *configfs_dir_cachep;
Joel Becker7063fbf2005-12-15 14:29:43 -080063
64extern int configfs_is_root(struct config_item *item);
65
Joel Becker3d0f89b2006-01-25 13:31:07 -080066extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *);
Joel Becker7063fbf2005-12-15 14:29:43 -080067extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *));
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -070068extern int configfs_inode_init(void);
69extern void configfs_inode_exit(void);
Joel Becker7063fbf2005-12-15 14:29:43 -080070
71extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
72extern int configfs_make_dirent(struct configfs_dirent *,
73 struct dentry *, void *, umode_t, int);
Louis Rilling2a109f22008-07-04 16:56:05 +020074extern int configfs_dirent_is_ready(struct configfs_dirent *);
Joel Becker7063fbf2005-12-15 14:29:43 -080075
76extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int);
77extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
78
79extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
80extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
Joel Becker3d0f89b2006-01-25 13:31:07 -080081extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
Joel Becker7063fbf2005-12-15 14:29:43 -080082
83extern int configfs_pin_fs(void);
84extern void configfs_release_fs(void);
85
86extern struct rw_semaphore configfs_rename_sem;
87extern struct super_block * configfs_sb;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080088extern const struct file_operations configfs_dir_operations;
89extern const struct file_operations configfs_file_operations;
90extern const struct file_operations bin_fops;
Arjan van de Ven754661f2007-02-12 00:55:38 -080091extern const struct inode_operations configfs_dir_inode_operations;
92extern const struct inode_operations configfs_symlink_inode_operations;
Joel Becker7063fbf2005-12-15 14:29:43 -080093
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
Nick Pigginda502952011-01-07 17:49:33 +1100123 spin_lock(&dentry->d_lock);
Joel Becker7063fbf2005-12-15 14:29:43 -0800124 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 }
Nick Pigginda502952011-01-07 17:49:33 +1100132 spin_unlock(&dentry->d_lock);
Joel Becker7063fbf2005-12-15 14:29:43 -0800133
134 return item;
135}
136
137static inline void release_configfs_dirent(struct configfs_dirent * sd)
138{
Joel Becker3d0f89b2006-01-25 13:31:07 -0800139 if (!(sd->s_type & CONFIGFS_ROOT)) {
140 kfree(sd->s_iattr);
141 kmem_cache_free(configfs_dir_cachep, sd);
142 }
Joel Becker7063fbf2005-12-15 14:29:43 -0800143}
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