fs/jfs/jfs_xattr.h

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2002
   3  *
   4  *   This program is free software;  you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  12  *   the GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program;  if not, write to the Free Software
  16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  */
  18
  19 #ifndef H_JFS_XATTR
  20 #define H_JFS_XATTR
  21
  22 #include <linux/xattr.h>
  23
  24 /*
  25  * jfs_ea_list describe the on-disk format of the extended attributes.
  26  * I know the null-terminator is redundant since namelen is stored, but
  27  * I am maintaining compatibility with OS/2 where possible.
  28  */
  29 struct jfs_ea {
  30         u8 flag;        /* Unused? */
  31         u8 namelen;     /* Length of name */
  32         __le16 valuelen;        /* Length of value */
  33         char name[0];   /* Attribute name (includes null-terminator) */
  34 };                      /* Value immediately follows name */
  35
  36 struct jfs_ea_list {
  37         __le32 size;            /* overall size */
  38         struct jfs_ea ea[0];    /* Variable length list */
  39 };
  40
  41 /* Macros for defining maxiumum number of bytes supported for EAs */
  42 #define MAXEASIZE       65535
  43 #define MAXEALISTSIZE   MAXEASIZE
  44
  45 /*
  46  * some macros for dealing with variable length EA lists.
  47  */
  48 #define EA_SIZE(ea) \
  49         (sizeof (struct jfs_ea) + (ea)->namelen + 1 + \
  50          le16_to_cpu((ea)->valuelen))
  51 #define NEXT_EA(ea) ((struct jfs_ea *) (((char *) (ea)) + (EA_SIZE (ea))))
  52 #define FIRST_EA(ealist) ((ealist)->ea)
  53 #define EALIST_SIZE(ealist) le32_to_cpu((ealist)->size)
  54 #define END_EALIST(ealist) \
  55         ((struct jfs_ea *) (((char *) (ealist)) + EALIST_SIZE(ealist)))
  56
  57 extern int __jfs_setxattr(tid_t, struct inode *, const char *, const void *,
  58                           size_t, int);
  59 extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
  60 extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
  61
  62 extern const struct xattr_handler *jfs_xattr_handlers[];
  63
  64 #ifdef CONFIG_JFS_SECURITY
  65 extern int jfs_init_security(tid_t, struct inode *, struct inode *,
  66                              const struct qstr *);
  67 #else
  68 static inline int jfs_init_security(tid_t tid, struct inode *inode,
  69                                     struct inode *dir, const struct qstr *qstr)
  70 {
  71         return 0;
  72 }
  73 #endif
  74
  75 #endif  /* H_JFS_XATTR */