lib/ext2fs/bitmaps.c

   1 /*
   2  * bitmaps.c --- routines to read, write, and manipulate the inode and
   3  * block bitmaps.
   4  *
   5  * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
   6  *
   7  * %Begin-Header%
   8  * This file may be redistributed under the terms of the GNU Library
   9  * General Public License, version 2.
  10  * %End-Header%
  11  */
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #if HAVE_UNISTD_H
  16 #include <unistd.h>
  17 #endif
  18 #include <fcntl.h>
  19 #include <time.h>
  20 #if HAVE_SYS_STAT_H
  21 #include <sys/stat.h>
  22 #endif
  23 #if HAVE_SYS_TYPES_H
  24 #include <sys/types.h>
  25 #endif
  26
  27 #include "ext2_fs.h"
  28 #include "ext2fs.h"
  29 #include "ext2fsP.h"
  30
  31 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
  32 {
  33         ext2fs_free_generic_bmap(bitmap);
  34 }
  35
  36 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
  37 {
  38         ext2fs_free_generic_bmap(bitmap);
  39 }
  40
  41 errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
  42                              ext2fs_generic_bitmap *dest)
  43 {
  44         return (ext2fs_copy_generic_bmap(src, dest));
  45 }
  46 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
  47 {
  48         ext2fs_set_generic_bmap_padding(map);
  49 }
  50
  51 errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
  52                                        const char *descr,
  53                                        ext2fs_inode_bitmap *ret)
  54 {
  55         __u64           start, end, real_end;
  56
  57         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  58
  59         fs->write_bitmaps = ext2fs_write_bitmaps;
  60
  61         start = 1;
  62         end = fs->super->s_inodes_count;
  63         real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
  64
  65         /* Are we permitted to use new-style bitmaps? */
  66         if (fs->flags & EXT2_FLAG_64BITS)
  67                 return (ext2fs_alloc_generic_bmap(fs,
  68                                   EXT2_ET_MAGIC_INODE_BITMAP64,
  69                                   EXT2FS_BMAP64_BITARRAY,
  70                                   start, end, real_end, descr, ret));
  71
  72         /* Otherwise, check to see if the file system is small enough
  73          * to use old-style 32-bit bitmaps */
  74         if ((end > ~0U) || (real_end > ~0U))
  75                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
  76
  77         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
  78                                          start, end, real_end,
  79                                          descr, 0,
  80                                          (ext2fs_generic_bitmap *) ret));
  81 }
  82
  83 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
  84                                        const char *descr,
  85                                        ext2fs_block_bitmap *ret)
  86 {
  87         __u64           start, end, real_end;
  88
  89         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  90
  91         fs->write_bitmaps = ext2fs_write_bitmaps;
  92
  93         start = fs->super->s_first_data_block;
  94         end = ext2fs_blocks_count(fs->super)-1;
  95         real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
  96                     * (__u64) fs->group_desc_count)-1 + start;
  97
  98         if (fs->flags & EXT2_FLAG_64BITS)
  99                 return (ext2fs_alloc_generic_bmap(fs,
 100                                   EXT2_ET_MAGIC_BLOCK_BITMAP64,
 101                                   EXT2FS_BMAP64_BITARRAY,
 102                                   start, end, real_end, descr, ret));
 103
 104         if ((end > ~0U) || (real_end > ~0U))
 105                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
 106
 107         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
 108                                            start, end, real_end,
 109                                            descr, 0,
 110                                            (ext2fs_generic_bitmap *) ret));
 111 }
 112
 113 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
 114                                         ext2_ino_t end, ext2_ino_t *oend)
 115 {
 116         __u64 tmp_oend;
 117         int retval;
 118
 119         retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
 120                                                EXT2_ET_FUDGE_INODE_BITMAP_END,
 121                                                end, &tmp_oend);
 122         if (oend)
 123                 *oend = tmp_oend;
 124         return retval;
 125 }
 126
 127 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
 128                                         blk_t end, blk_t *oend)
 129 {
 130         return (ext2fs_fudge_generic_bitmap_end(bitmap,
 131                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 132                                                 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 133                                                 end, oend));
 134 }
 135
 136 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
 137                                          blk64_t end, blk64_t *oend)
 138 {
 139         return (ext2fs_fudge_generic_bmap_end(bitmap,
 140                                               EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 141                                               end, oend));
 142 }
 143
 144 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
 145 {
 146         ext2fs_clear_generic_bmap(bitmap);
 147 }
 148
 149 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
 150 {
 151         ext2fs_clear_generic_bmap(bitmap);
 152 }
 153
 154 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
 155                                      ext2fs_inode_bitmap bmap)
 156 {
 157         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
 158                                              new_end, new_real_end, bmap));
 159 }
 160
 161 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
 162                                       ext2fs_inode_bitmap bmap)
 163 {
 164         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 165 }
 166
 167 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
 168                                      ext2fs_block_bitmap bmap)
 169 {
 170         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
 171                                              new_end, new_real_end, bmap));
 172 }
 173
 174 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
 175                                       ext2fs_block_bitmap bmap)
 176 {
 177         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 178 }
 179
 180 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
 181                                       ext2fs_block_bitmap bm2)
 182 {
 183         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
 184                                             bm1, bm2));
 185 }
 186
 187 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
 188                                       ext2fs_inode_bitmap bm2)
 189 {
 190         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
 191                                             bm1, bm2));
 192 }
 193
 194 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 195                                         ext2_ino_t start, unsigned int num,
 196                                         void *in)
 197 {
 198         return (ext2fs_set_generic_bitmap_range(bmap,
 199                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 200                                                 start, num, in));
 201 }
 202
 203 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 204                                          __u64 start, size_t num,
 205                                          void *in)
 206 {
 207         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 208 }
 209
 210 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 211                                         ext2_ino_t start, unsigned int num,
 212                                         void *out)
 213 {
 214         return (ext2fs_get_generic_bitmap_range(bmap,
 215                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 216                                                 start, num, out));
 217 }
 218
 219 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 220                                          __u64 start, size_t num,
 221                                          void *out)
 222 {
 223         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 224 }
 225
 226 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
 227                                         blk_t start, unsigned int num,
 228                                         void *in)
 229 {
 230         return (ext2fs_set_generic_bitmap_range(bmap,
 231                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 232                                                 start, num, in));
 233 }
 234
 235 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
 236                                          blk64_t start, size_t num,
 237                                          void *in)
 238 {
 239         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 240 }
 241
 242 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
 243                                         blk_t start, unsigned int num,
 244                                         void *out)
 245 {
 246         return (ext2fs_get_generic_bitmap_range(bmap,
 247                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 248                                                 start, num, out));
 249 }
 250
 251 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
 252                                          blk64_t start, size_t num,
 253                                          void *out)
 254 {
 255         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 256 }