Joel Becker | 7063fbf | 2005-12-15 14:29:43 -0800 | [diff] [blame] | 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 | |
| 30 | struct configfs_dirent { |
| 31 | atomic_t s_count; |
| 32 | struct list_head s_sibling; |
| 33 | struct list_head s_children; |
| 34 | struct list_head s_links; |
| 35 | void * s_element; |
| 36 | int s_type; |
| 37 | umode_t s_mode; |
| 38 | struct dentry * s_dentry; |
Joel Becker | 3d0f89b | 2006-01-25 13:31:07 -0800 | [diff] [blame] | 39 | struct iattr * s_iattr; |
Joel Becker | 7063fbf | 2005-12-15 14:29:43 -0800 | [diff] [blame] | 40 | }; |
| 41 | |
| 42 | #define CONFIGFS_ROOT 0x0001 |
| 43 | #define CONFIGFS_DIR 0x0002 |
| 44 | #define CONFIGFS_ITEM_ATTR 0x0004 |
| 45 | #define CONFIGFS_ITEM_LINK 0x0020 |
| 46 | #define CONFIGFS_USET_DIR 0x0040 |
| 47 | #define CONFIGFS_USET_DEFAULT 0x0080 |
| 48 | #define CONFIGFS_USET_DROPPING 0x0100 |
| 49 | #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR) |
| 50 | |
| 51 | extern struct vfsmount * configfs_mount; |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 52 | extern struct kmem_cache *configfs_dir_cachep; |
Joel Becker | 7063fbf | 2005-12-15 14:29:43 -0800 | [diff] [blame] | 53 | |
| 54 | extern int configfs_is_root(struct config_item *item); |
| 55 | |
Joel Becker | 3d0f89b | 2006-01-25 13:31:07 -0800 | [diff] [blame] | 56 | extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *); |
Joel Becker | 7063fbf | 2005-12-15 14:29:43 -0800 | [diff] [blame] | 57 | extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *)); |
| 58 | |
| 59 | extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); |
| 60 | extern int configfs_make_dirent(struct configfs_dirent *, |
| 61 | struct dentry *, void *, umode_t, int); |
| 62 | |
| 63 | extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int); |
| 64 | extern void configfs_hash_and_remove(struct dentry * dir, const char * name); |
| 65 | |
| 66 | extern const unsigned char * configfs_get_name(struct configfs_dirent *sd); |
| 67 | extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent); |
Joel Becker | 3d0f89b | 2006-01-25 13:31:07 -0800 | [diff] [blame] | 68 | extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr); |
Joel Becker | 7063fbf | 2005-12-15 14:29:43 -0800 | [diff] [blame] | 69 | |
| 70 | extern int configfs_pin_fs(void); |
| 71 | extern void configfs_release_fs(void); |
| 72 | |
| 73 | extern struct rw_semaphore configfs_rename_sem; |
| 74 | extern struct super_block * configfs_sb; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 75 | extern const struct file_operations configfs_dir_operations; |
| 76 | extern const struct file_operations configfs_file_operations; |
| 77 | extern const struct file_operations bin_fops; |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame^] | 78 | extern const struct inode_operations configfs_dir_inode_operations; |
| 79 | extern const struct inode_operations configfs_symlink_inode_operations; |
Joel Becker | 7063fbf | 2005-12-15 14:29:43 -0800 | [diff] [blame] | 80 | |
| 81 | extern int configfs_symlink(struct inode *dir, struct dentry *dentry, |
| 82 | const char *symname); |
| 83 | extern int configfs_unlink(struct inode *dir, struct dentry *dentry); |
| 84 | |
| 85 | struct configfs_symlink { |
| 86 | struct list_head sl_list; |
| 87 | struct config_item *sl_target; |
| 88 | }; |
| 89 | |
| 90 | extern int configfs_create_link(struct configfs_symlink *sl, |
| 91 | struct dentry *parent, |
| 92 | struct dentry *dentry); |
| 93 | |
| 94 | static inline struct config_item * to_item(struct dentry * dentry) |
| 95 | { |
| 96 | struct configfs_dirent * sd = dentry->d_fsdata; |
| 97 | return ((struct config_item *) sd->s_element); |
| 98 | } |
| 99 | |
| 100 | static inline struct configfs_attribute * to_attr(struct dentry * dentry) |
| 101 | { |
| 102 | struct configfs_dirent * sd = dentry->d_fsdata; |
| 103 | return ((struct configfs_attribute *) sd->s_element); |
| 104 | } |
| 105 | |
| 106 | static inline struct config_item *configfs_get_config_item(struct dentry *dentry) |
| 107 | { |
| 108 | struct config_item * item = NULL; |
| 109 | |
| 110 | spin_lock(&dcache_lock); |
| 111 | if (!d_unhashed(dentry)) { |
| 112 | struct configfs_dirent * sd = dentry->d_fsdata; |
| 113 | if (sd->s_type & CONFIGFS_ITEM_LINK) { |
| 114 | struct configfs_symlink * sl = sd->s_element; |
| 115 | item = config_item_get(sl->sl_target); |
| 116 | } else |
| 117 | item = config_item_get(sd->s_element); |
| 118 | } |
| 119 | spin_unlock(&dcache_lock); |
| 120 | |
| 121 | return item; |
| 122 | } |
| 123 | |
| 124 | static inline void release_configfs_dirent(struct configfs_dirent * sd) |
| 125 | { |
Joel Becker | 3d0f89b | 2006-01-25 13:31:07 -0800 | [diff] [blame] | 126 | if (!(sd->s_type & CONFIGFS_ROOT)) { |
| 127 | kfree(sd->s_iattr); |
| 128 | kmem_cache_free(configfs_dir_cachep, sd); |
| 129 | } |
Joel Becker | 7063fbf | 2005-12-15 14:29:43 -0800 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd) |
| 133 | { |
| 134 | if (sd) { |
| 135 | WARN_ON(!atomic_read(&sd->s_count)); |
| 136 | atomic_inc(&sd->s_count); |
| 137 | } |
| 138 | return sd; |
| 139 | } |
| 140 | |
| 141 | static inline void configfs_put(struct configfs_dirent * sd) |
| 142 | { |
| 143 | WARN_ON(!atomic_read(&sd->s_count)); |
| 144 | if (atomic_dec_and_test(&sd->s_count)) |
| 145 | release_configfs_dirent(sd); |
| 146 | } |
| 147 | |