SQUASHFS/squashfs-tools-4.4/squashfs-tools/xattr.h

   1 #ifndef XATTR_H
   2 #define XATTR_H
   3 /*
   4  * Create a squashfs filesystem.  This is a highly compressed read only
   5  * filesystem.
   6  *
   7  * Copyright (c) 2010, 2012, 2013, 2014, 2019
   8  * Phillip Lougher <phillip@squashfs.org.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2,
  13  * or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  * xattr.h
  25  */
  26
  27 #define XATTR_VALUE_OOL         SQUASHFS_XATTR_VALUE_OOL
  28 #define XATTR_PREFIX_MASK       SQUASHFS_XATTR_PREFIX_MASK
  29
  30 #define XATTR_VALUE_OOL_SIZE    sizeof(long long)
  31
  32 /* maximum size of xattr value data that will be inlined */
  33 #define XATTR_INLINE_MAX        128
  34
  35 /* the target size of an inode's xattr name:value list.  If it
  36  * exceeds this, then xattr value data will be successively out of lined
  37  * until it meets the target */
  38 #define XATTR_TARGET_MAX        65536
  39
  40 #define IS_XATTR(a)             (a != SQUASHFS_INVALID_XATTR)
  41
  42 struct xattr_list {
  43         char                    *name;
  44         char                    *full_name;
  45         int                     size;
  46         int                     vsize;
  47         void                    *value;
  48         int                     type;
  49         long long               ool_value;
  50         unsigned short          vchecksum;
  51         struct xattr_list       *vnext;
  52 };
  53
  54 struct dupl_id {
  55         struct xattr_list       *xattr_list;
  56         int                     xattrs;
  57         int                     xattr_id;
  58         struct dupl_id          *next;
  59 };
  60
  61 struct prefix {
  62         char                    *prefix;
  63         int                     type;
  64 };
  65
  66 extern int generate_xattrs(int, struct xattr_list *);
  67
  68 #ifdef XATTR_SUPPORT
  69 extern int get_xattrs(int, struct squashfs_super_block *);
  70 extern int read_xattrs(void *);
  71 extern long long write_xattrs();
  72 extern void save_xattrs();
  73 extern void restore_xattrs();
  74 extern unsigned int xattr_bytes, total_xattr_bytes;
  75 extern int write_xattr(char *, unsigned int);
  76 extern int read_xattrs_from_disk(int, struct squashfs_super_block *, int, long long *);
  77 extern struct xattr_list *get_xattr(int, unsigned int *, int *);
  78 extern void free_xattr(struct xattr_list *, int);
  79 #else
  80 static inline int get_xattrs(int fd, struct squashfs_super_block *sBlk)
  81 {
  82         if(sBlk->xattr_id_table_start != SQUASHFS_INVALID_BLK) {
  83                 fprintf(stderr, "Xattrs in filesystem! These are not "
  84                         "supported on this version of Squashfs\n");
  85                 return 0;
  86         } else
  87                 return SQUASHFS_INVALID_BLK;
  88 }
  89
  90
  91 static inline int read_xattrs(void *dir_ent)
  92 {
  93         return SQUASHFS_INVALID_XATTR;
  94 }
  95
  96
  97 static inline long long write_xattrs()
  98 {
  99         return SQUASHFS_INVALID_BLK;
 100 }
 101
 102
 103 static inline void save_xattrs()
 104 {
 105 }
 106
 107
 108 static inline void restore_xattrs()
 109 {
 110 }
 111
 112
 113 static inline int write_xattr(char *pathname, unsigned int xattr)
 114 {
 115         return 0;
 116 }
 117
 118
 119 static inline int read_xattrs_from_disk(int fd, struct squashfs_super_block *sBlk, int flag, long long *table_start)
 120 {
 121         if(sBlk->xattr_id_table_start != SQUASHFS_INVALID_BLK) {
 122                 fprintf(stderr, "Xattrs in filesystem! These are not "
 123                         "supported on this version of Squashfs\n");
 124                 return 0;
 125         } else
 126                 return SQUASHFS_INVALID_BLK;
 127 }
 128
 129
 130 static inline struct xattr_list *get_xattr(int i, unsigned int *count, int j)
 131 {
 132         return NULL;
 133 }
 134 #endif
 135
 136 #ifdef XATTR_SUPPORT
 137 #ifdef XATTR_DEFAULT
 138 #define NOXOPT_STR
 139 #define XOPT_STR " (default)"
 140 #define XATTR_DEF 0
 141 #else
 142 #define NOXOPT_STR " (default)"
 143 #define XOPT_STR
 144 #define XATTR_DEF 1
 145 #endif
 146 #else
 147 #define NOXOPT_STR " (default)"
 148 #define XOPT_STR " (unsupported)"
 149 #define XATTR_DEF 1
 150 #endif
 151 #endif