include/linux/reiserfs_xattr.h

   1 /*
   2   File: linux/reiserfs_xattr.h
   3 */
   4
   5 #include <linux/config.h>
   6 #include <linux/init.h>
   7 #include <linux/xattr.h>
   8
   9 /* Magic value in header */
  10 #define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
  11
  12 struct reiserfs_xattr_header {
  13     __u32 h_magic;              /* magic number for identification */
  14     __u32 h_hash;               /* hash of the value */
  15 };
  16
  17 #ifdef __KERNEL__
  18
  19 struct reiserfs_xattr_handler {
  20         char *prefix;
  21         int (*init)(void);
  22         void (*exit)(void);
  23         int (*get)(struct inode *inode, const char *name, void *buffer,
  24                    size_t size);
  25         int (*set)(struct inode *inode, const char *name, const void *buffer,
  26                    size_t size, int flags);
  27         int (*del)(struct inode *inode, const char *name);
  28         int (*list)(struct inode *inode, const char *name, int namelen, char *out);
  29         struct list_head handlers;
  30 };
  31
  32
  33 #ifdef CONFIG_REISERFS_FS_XATTR
  34 #define is_reiserfs_priv_object(inode) (REISERFS_I(inode)->i_flags & i_priv_object)
  35 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
  36 ssize_t reiserfs_getxattr (struct dentry *dentry, const char *name,
  37                            void *buffer, size_t size);
  38 int reiserfs_setxattr (struct dentry *dentry, const char *name,
  39                        const void *value, size_t size, int flags);
  40 ssize_t reiserfs_listxattr (struct dentry *dentry, char *buffer, size_t size);
  41 int reiserfs_removexattr (struct dentry *dentry, const char *name);
  42 int reiserfs_delete_xattrs (struct inode *inode);
  43 int reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs);
  44 int reiserfs_xattr_init (struct super_block *sb, int mount_flags);
  45 int reiserfs_permission (struct inode *inode, int mask, struct nameidata *nd);
  46 int reiserfs_permission_locked (struct inode *inode, int mask, struct nameidata *nd);
  47
  48 int reiserfs_xattr_del (struct inode *, const char *);
  49 int reiserfs_xattr_get (const struct inode *, const char *, void *, size_t);
  50 int reiserfs_xattr_set (struct inode *, const char *, const void *,
  51                                size_t, int);
  52
  53 extern struct reiserfs_xattr_handler user_handler;
  54 extern struct reiserfs_xattr_handler trusted_handler;
  55 #ifdef CONFIG_REISERFS_FS_SECURITY
  56 extern struct reiserfs_xattr_handler security_handler;
  57 #endif
  58
  59 int reiserfs_xattr_register_handlers (void) __init;
  60 void reiserfs_xattr_unregister_handlers (void);
  61
  62 static inline void
  63 reiserfs_write_lock_xattrs(struct super_block *sb)
  64 {
  65     down_write (&REISERFS_XATTR_DIR_SEM(sb));
  66 }
  67 static inline void
  68 reiserfs_write_unlock_xattrs(struct super_block *sb)
  69 {
  70     up_write (&REISERFS_XATTR_DIR_SEM(sb));
  71 }
  72 static inline void
  73 reiserfs_read_lock_xattrs(struct super_block *sb)
  74 {
  75     down_read (&REISERFS_XATTR_DIR_SEM(sb));
  76 }
  77
  78 static inline void
  79 reiserfs_read_unlock_xattrs(struct super_block *sb)
  80 {
  81     up_read (&REISERFS_XATTR_DIR_SEM(sb));
  82 }
  83
  84 static inline void
  85 reiserfs_write_lock_xattr_i(struct inode *inode)
  86 {
  87     down_write (&REISERFS_I(inode)->xattr_sem);
  88 }
  89 static inline void
  90 reiserfs_write_unlock_xattr_i(struct inode *inode)
  91 {
  92     up_write (&REISERFS_I(inode)->xattr_sem);
  93 }
  94 static inline void
  95 reiserfs_read_lock_xattr_i(struct inode *inode)
  96 {
  97     down_read (&REISERFS_I(inode)->xattr_sem);
  98 }
  99
 100 static inline void
 101 reiserfs_read_unlock_xattr_i(struct inode *inode)
 102 {
 103     up_read (&REISERFS_I(inode)->xattr_sem);
 104 }
 105
 106 #else
 107
 108 #define is_reiserfs_priv_object(inode) 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)
 114 #define reiserfs_write_unlock_xattrs(sb)
 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) { return 0; };
 124 static inline int reiserfs_chown_xattrs (struct inode *inode, struct iattr *attrs) { return 0; };
 125 static inline int reiserfs_xattr_init (struct super_block *sb, int mount_flags)
 126 {
 127     sb->s_flags = (sb->s_flags & ~MS_POSIXACL); /* to be sure */
 128     return 0;
 129 };
 130 #endif
 131
 132 #endif  /* __KERNEL__ */