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Linux/fs/jfs/jfs_xattr.h

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  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 */
 76 

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