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
  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
 161
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