include/linux/reiserfs_xattr.h

   1 /*
   2   File: linux/reiserfs_xattr.h
   3 */
   4
   5 #include <linux/xattr.h>
   6
   7 /* Magic value in header */
   8 #define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
   9
  10 struct reiserfs_xattr_header {
  11         __le32 h_magic;         /* magic number for identification */
  12         __le32 h_hash;          /* hash of the value */
  13 };
  14
  15 #ifdef __KERNEL__
  16 #include <linux/init.h>
  17
  18 struct reiserfs_xattr_handler {
  19         char *prefix;
  20         int (*init) (void);
  21         void (*exit) (void);
  22         int (*get) (struct inode * inode, const char *name, void *buffer,
  23                     size_t size);
  24         int (*set) (struct inode * inode, const char *name, const void *buffer,
  25                     size_t size, int flags);
  26         int (*del) (struct inode * inode, const char *name);
  27         int (*list) (struct inode * inode, const char *name, int namelen,
  28                      char *out);
  29         struct list_head handlers;
  30 };
  31
  32 #ifdef CONFIG_REISERFS_FS_XATTR
  33 #define is_reiserfs_priv_object(inode) IS_PRIVATE(inode)
  34 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
  35 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
  36                           void *buffer, size_t size);
  37 int reiserfs_setxattr(struct dentry *dentry, const char *name,
  38                       const void *value, size_t size, int flags);
  39 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  40 int reiserfs_removexattr(struct dentry *dentry, const char *name);
  41 int reiserfs_delete_xattrs(struct inode *inode);
  42 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  43 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  44 int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd);
  45
  46 int reiserfs_xattr_del(struct inode *, const char *);
  47 int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
  48 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  49
  50 extern struct reiserfs_xattr_handler user_handler;
  51 extern struct reiserfs_xattr_handler trusted_handler;
  52 #ifdef CONFIG_REISERFS_FS_SECURITY
  53 extern struct reiserfs_xattr_handler security_handler;
  54 #endif
  55
  56 int reiserfs_xattr_register_handlers(void) __init;
  57 void reiserfs_xattr_unregister_handlers(void);
  58
  59 static inline void reiserfs_write_lock_xattrs(struct super_block *sb)
  60 {
  61         down_write(&REISERFS_XATTR_DIR_SEM(sb));
  62 }
  63 static inline void reiserfs_write_unlock_xattrs(struct super_block *sb)
  64 {
  65         up_write(&REISERFS_XATTR_DIR_SEM(sb));
  66 }
  67 static inline void reiserfs_read_lock_xattrs(struct super_block *sb)
  68 {
  69         down_read(&REISERFS_XATTR_DIR_SEM(sb));
  70 }
  71
  72 static inline void reiserfs_read_unlock_xattrs(struct super_block *sb)
  73 {
  74         up_read(&REISERFS_XATTR_DIR_SEM(sb));
  75 }
  76
  77 static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
  78 {
  79         down_write(&REISERFS_I(inode)->xattr_sem);
  80 }
  81 static inline void reiserfs_write_unlock_xattr_i(struct inode *inode)
  82 {
  83         up_write(&REISERFS_I(inode)->xattr_sem);
  84 }
  85 static inline void reiserfs_read_lock_xattr_i(struct inode *inode)
  86 {
  87         down_read(&REISERFS_I(inode)->xattr_sem);
  88 }
  89
  90 static inline void reiserfs_read_unlock_xattr_i(struct inode *inode)
  91 {
  92         up_read(&REISERFS_I(inode)->xattr_sem);
  93 }
  94
  95 static inline void reiserfs_mark_inode_private(struct inode *inode)
  96 {
  97         inode->i_flags |= S_PRIVATE;
  98 }
  99
 100 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 101 {
 102         init_rwsem(&REISERFS_I(inode)->xattr_sem);
 103 }
 104
 105 #else
 106
 107 #define is_reiserfs_priv_object(inode) 0
 108 #define reiserfs_mark_inode_private(inode) do {;} while(0)
 109 #define reiserfs_getxattr NULL
 110 #define reiserfs_setxattr NULL
 111 #define reiserfs_listxattr NULL
 112 #define reiserfs_removexattr NULL
 113 #define reiserfs_write_lock_xattrs(sb) do {;} while(0)
 114 #define reiserfs_write_unlock_xattrs(sb) do {;} while(0)
 115 #define reiserfs_read_lock_xattrs(sb)
 116 #define reiserfs_read_unlock_xattrs(sb)
 117
 118 #define reiserfs_permission NULL
 119
 120 #define reiserfs_xattr_register_handlers() 0
 121 #define reiserfs_xattr_unregister_handlers()
 122
 123 static inline int reiserfs_delete_xattrs(struct inode *inode)
 124 {
 125         return 0;
 126 };
 127 static inline int reiserfs_chown_xattrs(struct inode *inode,
 128                                         struct iattr *attrs)
 129 {
 130         return 0;
 131 };
 132 static inline int reiserfs_xattr_init(struct super_block *sb, int mount_flags)
 133 {
 134         sb->s_flags = (sb->s_flags & ~MS_POSIXACL);     /* to be sure */
 135         return 0;
 136 };
 137 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 138 {
 139 }
 140 #endif
 141
 142 #endif                          /* __KERNEL__ */