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         __le32 h_magic;         /* magic number for identification */
  14         __le32 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,
  29                      char *out);
  30         struct list_head handlers;
  31 };
  32
  33 #ifdef CONFIG_REISERFS_FS_XATTR
  34 #define is_reiserfs_priv_object(inode) IS_PRIVATE(inode)
  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,
  47                                struct nameidata *nd);
  48
  49 int reiserfs_xattr_del(struct inode *, const char *);
  50 int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
  51 int reiserfs_xattr_set(struct inode *, const char *, const void *, 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 reiserfs_write_lock_xattrs(struct super_block *sb)
  63 {
  64         down_write(&REISERFS_XATTR_DIR_SEM(sb));
  65 }
  66 static inline void reiserfs_write_unlock_xattrs(struct super_block *sb)
  67 {
  68         up_write(&REISERFS_XATTR_DIR_SEM(sb));
  69 }
  70 static inline void reiserfs_read_lock_xattrs(struct super_block *sb)
  71 {
  72         down_read(&REISERFS_XATTR_DIR_SEM(sb));
  73 }
  74
  75 static inline void reiserfs_read_unlock_xattrs(struct super_block *sb)
  76 {
  77         up_read(&REISERFS_XATTR_DIR_SEM(sb));
  78 }
  79
  80 static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
  81 {
  82         down_write(&REISERFS_I(inode)->xattr_sem);
  83 }
  84 static inline void reiserfs_write_unlock_xattr_i(struct inode *inode)
  85 {
  86         up_write(&REISERFS_I(inode)->xattr_sem);
  87 }
  88 static inline void reiserfs_read_lock_xattr_i(struct inode *inode)
  89 {
  90         down_read(&REISERFS_I(inode)->xattr_sem);
  91 }
  92
  93 static inline void reiserfs_read_unlock_xattr_i(struct inode *inode)
  94 {
  95         up_read(&REISERFS_I(inode)->xattr_sem);
  96 }
  97
  98 static inline void reiserfs_mark_inode_private(struct inode *inode)
  99 {
 100         inode->i_flags |= S_PRIVATE;
 101 }
 102
 103 #else
 104
 105 #define is_reiserfs_priv_object(inode) 0
 106 #define reiserfs_mark_inode_private(inode)
 107 #define reiserfs_getxattr NULL
 108 #define reiserfs_setxattr NULL
 109 #define reiserfs_listxattr NULL
 110 #define reiserfs_removexattr NULL
 111 #define reiserfs_write_lock_xattrs(sb)
 112 #define reiserfs_write_unlock_xattrs(sb)
 113 #define reiserfs_read_lock_xattrs(sb)
 114 #define reiserfs_read_unlock_xattrs(sb)
 115
 116 #define reiserfs_permission NULL
 117
 118 #define reiserfs_xattr_register_handlers() 0
 119 #define reiserfs_xattr_unregister_handlers()
 120
 121 static inline int reiserfs_delete_xattrs(struct inode *inode)
 122 {
 123         return 0;
 124 };
 125 static inline int reiserfs_chown_xattrs(struct inode *inode,
 126                                         struct iattr *attrs)
 127 {
 128         return 0;
 129 };
 130 static inline int reiserfs_xattr_init(struct super_block *sb, int mount_flags)
 131 {
 132         sb->s_flags = (sb->s_flags & ~MS_POSIXACL);     /* to be sure */
 133         return 0;
 134 };
 135 #endif
 136
 137 #endif                          /* __KERNEL__ */