include/linux/reiserfs_xattr.h

   1 /*
   2   File: linux/reiserfs_xattr.h
   3 */
   4
   5 #ifndef _LINUX_REISERFS_XATTR_H
   6 #define _LINUX_REISERFS_XATTR_H
   7
   8 #include <linux/types.h>
   9
  10 /* Magic value in header */
  11 #define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
  12
  13 struct reiserfs_xattr_header {
  14         __le32 h_magic;         /* magic number for identification */
  15         __le32 h_hash;          /* hash of the value */
  16 };
  17
  18 #ifdef __KERNEL__
  19
  20 #include <linux/init.h>
  21 #include <linux/list.h>
  22 #include <linux/rwsem.h>
  23 #include <linux/reiserfs_fs_i.h>
  24 #include <linux/reiserfs_fs.h>
  25
  26 struct inode;
  27 struct dentry;
  28 struct iattr;
  29 struct super_block;
  30 struct nameidata;
  31
  32 struct reiserfs_xattr_handler {
  33         char *prefix;
  34         int (*init) (void);
  35         void (*exit) (void);
  36         int (*get) (struct inode * inode, const char *name, void *buffer,
  37                     size_t size);
  38         int (*set) (struct inode * inode, const char *name, const void *buffer,
  39                     size_t size, int flags);
  40         int (*del) (struct inode * inode, const char *name);
  41         int (*list) (struct inode * inode, const char *name, int namelen,
  42                      char *out);
  43         struct list_head handlers;
  44 };
  45
  46 int reiserfs_xattr_register_handlers(void) __init;
  47 void reiserfs_xattr_unregister_handlers(void);
  48 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  49 int reiserfs_delete_xattrs(struct inode *inode);
  50 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  51
  52 #ifdef CONFIG_REISERFS_FS_XATTR
  53 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
  54 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
  55                           void *buffer, size_t size);
  56 int reiserfs_setxattr(struct dentry *dentry, const char *name,
  57                       const void *value, size_t size, int flags);
  58 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  59 int reiserfs_removexattr(struct dentry *dentry, const char *name);
  60 int reiserfs_permission(struct inode *inode, int mask);
  61
  62 int reiserfs_xattr_del(struct inode *, const char *);
  63 int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
  64 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  65
  66 extern struct reiserfs_xattr_handler user_handler;
  67 extern struct reiserfs_xattr_handler trusted_handler;
  68 extern struct reiserfs_xattr_handler security_handler;
  69
  70 static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
  71 {
  72         down_write(&REISERFS_I(inode)->i_xattr_sem);
  73 }
  74 static inline void reiserfs_write_unlock_xattr_i(struct inode *inode)
  75 {
  76         up_write(&REISERFS_I(inode)->i_xattr_sem);
  77 }
  78 static inline void reiserfs_read_lock_xattr_i(struct inode *inode)
  79 {
  80         down_read(&REISERFS_I(inode)->i_xattr_sem);
  81 }
  82
  83 static inline void reiserfs_read_unlock_xattr_i(struct inode *inode)
  84 {
  85         up_read(&REISERFS_I(inode)->i_xattr_sem);
  86 }
  87
  88 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
  89 {
  90         init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
  91 }
  92
  93 #else
  94
  95 #define reiserfs_getxattr NULL
  96 #define reiserfs_setxattr NULL
  97 #define reiserfs_listxattr NULL
  98 #define reiserfs_removexattr NULL
  99 #define reiserfs_write_lock_xattrs(sb) do {;} while(0)
 100 #define reiserfs_write_unlock_xattrs(sb) do {;} while(0)
 101 #define reiserfs_read_lock_xattrs(sb)
 102 #define reiserfs_read_unlock_xattrs(sb)
 103
 104 #define reiserfs_permission NULL
 105
 106 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 107 {
 108 }
 109 #endif  /*  CONFIG_REISERFS_FS_XATTR  */
 110
 111 #endif  /*  __KERNEL__  */
 112
 113 #endif  /*  _LINUX_REISERFS_XATTR_H  */