configfs_internal.h 5.7 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. #ifdef pr_fmt
  27. #undef pr_fmt
  28. #endif
  29. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30. #include <linux/slab.h>
  31. #include <linux/list.h>
  32. #include <linux/spinlock.h>
  33. struct configfs_fragment {
  34. atomic_t frag_count;
  35. struct rw_semaphore frag_sem;
  36. bool frag_dead;
  37. };
  38. void put_fragment(struct configfs_fragment *);
  39. struct configfs_fragment *get_fragment(struct configfs_fragment *);
  40. struct configfs_dirent {
  41. atomic_t s_count;
  42. int s_dependent_count;
  43. struct list_head s_sibling;
  44. struct list_head s_children;
  45. struct list_head s_links;
  46. void * s_element;
  47. int s_type;
  48. umode_t s_mode;
  49. struct dentry * s_dentry;
  50. struct iattr * s_iattr;
  51. #ifdef CONFIG_LOCKDEP
  52. int s_depth;
  53. #endif
  54. struct configfs_fragment *s_frag;
  55. };
  56. #define CONFIGFS_ROOT 0x0001
  57. #define CONFIGFS_DIR 0x0002
  58. #define CONFIGFS_ITEM_ATTR 0x0004
  59. #define CONFIGFS_ITEM_BIN_ATTR 0x0008
  60. #define CONFIGFS_ITEM_LINK 0x0020
  61. #define CONFIGFS_USET_DIR 0x0040
  62. #define CONFIGFS_USET_DEFAULT 0x0080
  63. #define CONFIGFS_USET_DROPPING 0x0100
  64. #define CONFIGFS_USET_IN_MKDIR 0x0200
  65. #define CONFIGFS_USET_CREATING 0x0400
  66. #define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR | CONFIGFS_ITEM_BIN_ATTR)
  67. extern struct mutex configfs_symlink_mutex;
  68. extern spinlock_t configfs_dirent_lock;
  69. extern struct kmem_cache *configfs_dir_cachep;
  70. extern int configfs_is_root(struct config_item *item);
  71. extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
  72. extern int configfs_create(struct dentry *, umode_t mode, void (*init)(struct inode *));
  73. extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
  74. extern int configfs_create_bin_file(struct config_item *,
  75. const struct configfs_bin_attribute *);
  76. extern int configfs_make_dirent(struct configfs_dirent *, struct dentry *,
  77. void *, umode_t, int, struct configfs_fragment *);
  78. extern int configfs_dirent_is_ready(struct configfs_dirent *);
  79. extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
  80. extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
  81. extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
  82. extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
  83. extern struct dentry *configfs_pin_fs(void);
  84. extern void configfs_release_fs(void);
  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 configfs_bin_file_operations;
  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. extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
  94. const char *symname);
  95. extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
  96. struct configfs_symlink {
  97. struct list_head sl_list;
  98. struct config_item *sl_target;
  99. };
  100. extern int configfs_create_link(struct configfs_symlink *sl,
  101. struct dentry *parent,
  102. struct dentry *dentry);
  103. static inline struct config_item * to_item(struct dentry * dentry)
  104. {
  105. struct configfs_dirent * sd = dentry->d_fsdata;
  106. return ((struct config_item *) sd->s_element);
  107. }
  108. static inline struct configfs_attribute * to_attr(struct dentry * dentry)
  109. {
  110. struct configfs_dirent * sd = dentry->d_fsdata;
  111. return ((struct configfs_attribute *) sd->s_element);
  112. }
  113. static inline struct configfs_bin_attribute *to_bin_attr(struct dentry *dentry)
  114. {
  115. struct configfs_attribute *attr = to_attr(dentry);
  116. return container_of(attr, struct configfs_bin_attribute, cb_attr);
  117. }
  118. static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
  119. {
  120. struct config_item * item = NULL;
  121. spin_lock(&dentry->d_lock);
  122. if (!d_unhashed(dentry)) {
  123. struct configfs_dirent * sd = dentry->d_fsdata;
  124. if (sd->s_type & CONFIGFS_ITEM_LINK) {
  125. struct configfs_symlink * sl = sd->s_element;
  126. item = config_item_get(sl->sl_target);
  127. } else
  128. item = config_item_get(sd->s_element);
  129. }
  130. spin_unlock(&dentry->d_lock);
  131. return item;
  132. }
  133. static inline void release_configfs_dirent(struct configfs_dirent * sd)
  134. {
  135. if (!(sd->s_type & CONFIGFS_ROOT)) {
  136. kfree(sd->s_iattr);
  137. put_fragment(sd->s_frag);
  138. kmem_cache_free(configfs_dir_cachep, sd);
  139. }
  140. }
  141. static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
  142. {
  143. if (sd) {
  144. WARN_ON(!atomic_read(&sd->s_count));
  145. atomic_inc(&sd->s_count);
  146. }
  147. return sd;
  148. }
  149. static inline void configfs_put(struct configfs_dirent * sd)
  150. {
  151. WARN_ON(!atomic_read(&sd->s_count));
  152. if (atomic_dec_and_test(&sd->s_count))
  153. release_configfs_dirent(sd);
  154. }