LXR linux/fs/jfs/jfs

   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 */
  27struct jfs_ea {
  28        u8 flag;        /* Unused? */
  29        u8 namelen;     /* Length of name */
  30        __le16 valuelen;        /* Length of value */
  31        char name[0];   /* Attribute name (includes null-terminator) */
  32};                      /* Value immediately follows name */
  33
  34struct jfs_ea_list {
  35        __le32 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
  55extern int __jfs_setxattr(tid_t, struct inode *, const char *, const void *,
  56                          size_t, int);
  57extern int jfs_setxattr(struct dentry *, const char *, const void *, size_t,
  58                        int);
  59extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
  60extern ssize_t jfs_getxattr(struct dentry *, const char *, void *, size_t);
  61extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
  62extern int jfs_removexattr(struct dentry *, const char *);
  63
  64#ifdef CONFIG_JFS_SECURITY
  65extern int jfs_init_security(tid_t, struct inode *, struct inode *,
  66                             const struct qstr *);
  67#else
  68static 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 */
  76