configfs_internal.h 4.6 KB

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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. #include <linux/slab.h>
  27. #include <linux/list.h>
  28. struct configfs_dirent {
  29. atomic_t s_count;
  30. struct list_head s_sibling;
  31. struct list_head s_children;
  32. struct list_head s_links;
  33. void * s_element;
  34. int s_type;
  35. umode_t s_mode;
  36. struct dentry * s_dentry;
  37. struct iattr * s_iattr;
  38. };
  39. #define CONFIGFS_ROOT 0x0001
  40. #define CONFIGFS_DIR 0x0002
  41. #define CONFIGFS_ITEM_ATTR 0x0004
  42. #define CONFIGFS_ITEM_LINK 0x0020
  43. #define CONFIGFS_USET_DIR 0x0040
  44. #define CONFIGFS_USET_DEFAULT 0x0080
  45. #define CONFIGFS_USET_DROPPING 0x0100
  46. #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR)
  47. extern struct vfsmount * configfs_mount;
  48. extern struct kmem_cache *configfs_dir_cachep;
  49. extern int configfs_is_root(struct config_item *item);
  50. extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *);
  51. extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *));
  52. extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
  53. extern int configfs_make_dirent(struct configfs_dirent *,
  54. struct dentry *, void *, umode_t, int);
  55. extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int);
  56. extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
  57. extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
  58. extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
  59. extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
  60. extern int configfs_pin_fs(void);
  61. extern void configfs_release_fs(void);
  62. extern struct rw_semaphore configfs_rename_sem;
  63. extern struct super_block * configfs_sb;
  64. extern const struct file_operations configfs_dir_operations;
  65. extern const struct file_operations configfs_file_operations;
  66. extern const struct file_operations bin_fops;
  67. extern const struct inode_operations configfs_dir_inode_operations;
  68. extern const struct inode_operations configfs_symlink_inode_operations;
  69. extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
  70. const char *symname);
  71. extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
  72. struct configfs_symlink {
  73. struct list_head sl_list;
  74. struct config_item *sl_target;
  75. };
  76. extern int configfs_create_link(struct configfs_symlink *sl,
  77. struct dentry *parent,
  78. struct dentry *dentry);
  79. static inline struct config_item * to_item(struct dentry * dentry)
  80. {
  81. struct configfs_dirent * sd = dentry->d_fsdata;
  82. return ((struct config_item *) sd->s_element);
  83. }
  84. static inline struct configfs_attribute * to_attr(struct dentry * dentry)
  85. {
  86. struct configfs_dirent * sd = dentry->d_fsdata;
  87. return ((struct configfs_attribute *) sd->s_element);
  88. }
  89. static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
  90. {
  91. struct config_item * item = NULL;
  92. spin_lock(&dcache_lock);
  93. if (!d_unhashed(dentry)) {
  94. struct configfs_dirent * sd = dentry->d_fsdata;
  95. if (sd->s_type & CONFIGFS_ITEM_LINK) {
  96. struct configfs_symlink * sl = sd->s_element;
  97. item = config_item_get(sl->sl_target);
  98. } else
  99. item = config_item_get(sd->s_element);
  100. }
  101. spin_unlock(&dcache_lock);
  102. return item;
  103. }
  104. static inline void release_configfs_dirent(struct configfs_dirent * sd)
  105. {
  106. if (!(sd->s_type & CONFIGFS_ROOT)) {
  107. kfree(sd->s_iattr);
  108. kmem_cache_free(configfs_dir_cachep, sd);
  109. }
  110. }
  111. static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
  112. {
  113. if (sd) {
  114. WARN_ON(!atomic_read(&sd->s_count));
  115. atomic_inc(&sd->s_count);
  116. }
  117. return sd;
  118. }
  119. static inline void configfs_put(struct configfs_dirent * sd)
  120. {
  121. WARN_ON(!atomic_read(&sd->s_count));
  122. if (atomic_dec_and_test(&sd->s_count))
  123. release_configfs_dirent(sd);
  124. }