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TOMOYO Linux Cross Reference
Linux/fs/configfs/configfs_internal.h

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  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 
 31 struct 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 
 58 extern struct mutex configfs_symlink_mutex;
 59 extern spinlock_t configfs_dirent_lock;
 60 
 61 extern struct kmem_cache *configfs_dir_cachep;
 62 
 63 extern int configfs_is_root(struct config_item *item);
 64 
 65 extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
 66 extern int configfs_create(struct dentry *, umode_t mode, int (*init)(struct inode *));
 67 extern int configfs_inode_init(void);
 68 extern void configfs_inode_exit(void);
 69 
 70 extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
 71 extern int configfs_make_dirent(struct configfs_dirent *,
 72                                 struct dentry *, void *, umode_t, int);
 73 extern int configfs_dirent_is_ready(struct configfs_dirent *);
 74 
 75 extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int);
 76 extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
 77 
 78 extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
 79 extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
 80 extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
 81 
 82 extern struct dentry *configfs_pin_fs(void);
 83 extern void configfs_release_fs(void);
 84 
 85 extern struct rw_semaphore configfs_rename_sem;
 86 extern const struct file_operations configfs_dir_operations;
 87 extern const struct file_operations configfs_file_operations;
 88 extern const struct file_operations bin_fops;
 89 extern const struct inode_operations configfs_dir_inode_operations;
 90 extern const struct inode_operations configfs_root_inode_operations;
 91 extern const struct inode_operations configfs_symlink_inode_operations;
 92 extern const struct dentry_operations configfs_dentry_ops;
 93 
 94 extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
 95                             const char *symname);
 96 extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
 97 
 98 struct configfs_symlink {
 99         struct list_head sl_list;
100         struct config_item *sl_target;
101 };
102 
103 extern int configfs_create_link(struct configfs_symlink *sl,
104                                 struct dentry *parent,
105                                 struct dentry *dentry);
106 
107 static 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 
113 static 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 
119 static 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 
137 static 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 
145 static 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 
154 static 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 
161 

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