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 /*
  23  * jfs_ea_list describe the on-disk format of the extended attributes.
  24  * I know the null-terminator is redundant since namelen is stored, but
  25  * I am maintaining compatibility with OS/2 where possible.
  26  */
  27 struct jfs_ea {
  28         u8 flag;        /* Unused? */
  29         u8 namelen;     /* Length of name */
  30         u16 valuelen;   /* Length of value */
  31         char name[0];   /* Attribute name (includes null-terminator) */
  32 };                      /* Value immediately follows name */
  33
  34 struct jfs_ea_list {
  35         u32 size;               /* overall size */
  36         struct jfs_ea ea[0];    /* Variable length list */
  37 };
  38
  39 /* Macros for defining maxiumum number of bytes supported for EAs */
  40 #define MAXEASIZE       65535
  41 #define MAXEALISTSIZE   MAXEASIZE
  42
  43 /*
  44  * some macros for dealing with variable length EA lists.
  45  */
  46 #define EA_SIZE(ea) \
  47         (sizeof (struct jfs_ea) + (ea)->namelen + 1 + \
  48          le16_to_cpu((ea)->valuelen))
  49 #define NEXT_EA(ea) ((struct jfs_ea *) (((char *) (ea)) + (EA_SIZE (ea))))
  50 #define FIRST_EA(ealist) ((ealist)->ea)
  51 #define EALIST_SIZE(ealist) le32_to_cpu((ealist)->size)
  52 #define END_EALIST(ealist) \
  53         ((struct jfs_ea *) (((char *) (ealist)) + EALIST_SIZE(ealist)))
  54
  55 extern int __jfs_setxattr(struct inode *, const char *, const void *, size_t,
  56                           int);
  57 extern int jfs_setxattr(struct dentry *, const char *, const void *, size_t,
  58                         int);
  59 extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
  60 extern ssize_t jfs_getxattr(struct dentry *, const char *, void *, size_t);
  61 extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
  62 extern int jfs_removexattr(struct dentry *, const char *);
  63
  64 #endif  /* H_JFS_XATTR */