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 #ifdef CONFIG_REISERFS_FS_XATTR
  47 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
  48 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
  49                           void *buffer, size_t size);
  50 int reiserfs_setxattr(struct dentry *dentry, const char *name,
  51                       const void *value, size_t size, int flags);
  52 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  53 int reiserfs_removexattr(struct dentry *dentry, const char *name);
  54 int reiserfs_delete_xattrs(struct inode *inode);
  55 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  56 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  57 int reiserfs_permission(struct inode *inode, int mask);
  58
  59 int reiserfs_xattr_del(struct inode *, const char *);
  60 int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
  61 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  62
  63 extern struct reiserfs_xattr_handler user_handler;
  64 extern struct reiserfs_xattr_handler trusted_handler;
  65 extern struct reiserfs_xattr_handler security_handler;
  66
  67 int reiserfs_xattr_register_handlers(void) __init;
  68 void reiserfs_xattr_unregister_handlers(void);
  69
  70 static inline void reiserfs_write_lock_xattrs(struct super_block *sb)
  71 {
  72         down_write(&REISERFS_XATTR_DIR_SEM(sb));
  73 }
  74 static inline void reiserfs_write_unlock_xattrs(struct super_block *sb)
  75 {
  76         up_write(&REISERFS_XATTR_DIR_SEM(sb));
  77 }
  78 static inline void reiserfs_read_lock_xattrs(struct super_block *sb)
  79 {
  80         down_read(&REISERFS_XATTR_DIR_SEM(sb));
  81 }
  82
  83 static inline void reiserfs_read_unlock_xattrs(struct super_block *sb)
  84 {
  85         up_read(&REISERFS_XATTR_DIR_SEM(sb));
  86 }
  87
  88 static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
  89 {
  90         down_write(&REISERFS_I(inode)->xattr_sem);
  91 }
  92 static inline void reiserfs_write_unlock_xattr_i(struct inode *inode)
  93 {
  94         up_write(&REISERFS_I(inode)->xattr_sem);
  95 }
  96 static inline void reiserfs_read_lock_xattr_i(struct inode *inode)
  97 {
  98         down_read(&REISERFS_I(inode)->xattr_sem);
  99 }
 100
 101 static inline void reiserfs_read_unlock_xattr_i(struct inode *inode)
 102 {
 103         up_read(&REISERFS_I(inode)->xattr_sem);
 104 }
 105
 106 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 107 {
 108         init_rwsem(&REISERFS_I(inode)->xattr_sem);
 109 }
 110
 111 #else
 112
 113 #define reiserfs_getxattr NULL
 114 #define reiserfs_setxattr NULL
 115 #define reiserfs_listxattr NULL
 116 #define reiserfs_removexattr NULL
 117 #define reiserfs_write_lock_xattrs(sb) do {;} while(0)
 118 #define reiserfs_write_unlock_xattrs(sb) do {;} while(0)
 119 #define reiserfs_read_lock_xattrs(sb)
 120 #define reiserfs_read_unlock_xattrs(sb)
 121
 122 #define reiserfs_permission NULL
 123
 124 #define reiserfs_xattr_register_handlers() 0
 125 #define reiserfs_xattr_unregister_handlers()
 126
 127 static inline int reiserfs_delete_xattrs(struct inode *inode)
 128 {
 129         return 0;
 130 };
 131 static inline int reiserfs_chown_xattrs(struct inode *inode,
 132                                         struct iattr *attrs)
 133 {
 134         return 0;
 135 };
 136 static inline int reiserfs_xattr_init(struct super_block *sb, int mount_flags)
 137 {
 138         sb->s_flags = (sb->s_flags & ~MS_POSIXACL);     /* to be sure */
 139         return 0;
 140 };
 141 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 142 {
 143 }
 144 #endif  /*  CONFIG_REISERFS_FS_XATTR  */
 145
 146 #endif  /*  __KERNEL__  */
 147
 148 #endif  /*  _LINUX_REISERFS_XATTR_H  */