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 "config.h"
  14 #include <stdio.h>
  15 #include <string.h>
  16 #if HAVE_UNISTD_H
  17 #include <unistd.h>
  18 #endif
  19 #include <fcntl.h>
  20 #include <time.h>
  21 #if HAVE_SYS_STAT_H
  22 #include <sys/stat.h>
  23 #endif
  24 #if HAVE_SYS_TYPES_H
  25 #include <sys/types.h>
  26 #endif
  27
  28 #include "ext2_fs.h"
  29 #include "ext2fs.h"
  30 #include "ext2fsP.h"
  31 #include "bmap64.h"
  32
  33 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
  34 {
  35         ext2fs_free_generic_bmap(bitmap);
  36 }
  37
  38 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
  39 {
  40         ext2fs_free_generic_bmap(bitmap);
  41 }
  42
  43 errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
  44                              ext2fs_generic_bitmap *dest)
  45 {
  46         return (ext2fs_copy_generic_bmap(src, dest));
  47 }
  48
  49 errcode_t ext2fs_merge_bitmap(ext2fs_generic_bitmap src,
  50                               ext2fs_generic_bitmap dest,
  51                               ext2fs_generic_bitmap dup,
  52                               ext2fs_generic_bitmap dup_allowed)
  53 {
  54         return ext2fs_merge_generic_bmap(src, dest, dup,
  55                                          dup_allowed);
  56 }
  57
  58 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
  59 {
  60         ext2fs_set_generic_bmap_padding(map);
  61 }
  62
  63 errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
  64                                        const char *descr,
  65                                        ext2fs_inode_bitmap *ret)
  66 {
  67         __u64           start, end, real_end;
  68
  69         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  70
  71         if (ext2fs_has_feature_journal_dev(fs->super))
  72                 return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
  73
  74         fs->write_bitmaps = ext2fs_write_bitmaps;
  75
  76         start = 1;
  77         end = fs->super->s_inodes_count;
  78         real_end = (__u64)EXT2_INODES_PER_GROUP(fs->super) *
  79                 fs->group_desc_count;
  80
  81         /* Are we permitted to use new-style bitmaps? */
  82         if (fs->flags & EXT2_FLAG_64BITS)
  83                 return (ext2fs_alloc_generic_bmap(fs,
  84                                 EXT2_ET_MAGIC_INODE_BITMAP64,
  85                                 fs->default_bitmap_type,
  86                                 start, end, real_end, descr, ret));
  87
  88         /* Otherwise, check to see if the file system is small enough
  89          * to use old-style 32-bit bitmaps */
  90         if ((end > ~0U) || (real_end > ~0U))
  91                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
  92
  93         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
  94                                          start, end, real_end,
  95                                          descr, 0,
  96                                          (ext2fs_generic_bitmap *) ret));
  97 }
  98
  99 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
 100                                        const char *descr,
 101                                        ext2fs_block_bitmap *ret)
 102 {
 103         __u64           start, end, real_end;
 104
 105         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 106
 107         if (ext2fs_has_feature_journal_dev(fs->super))
 108                 return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
 109
 110         fs->write_bitmaps = ext2fs_write_bitmaps;
 111
 112         start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
 113         end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
 114         real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
 115                     * (__u64) fs->group_desc_count)-1 + start;
 116
 117         if (fs->flags & EXT2_FLAG_64BITS)
 118                 return (ext2fs_alloc_generic_bmap(fs,
 119                                 EXT2_ET_MAGIC_BLOCK_BITMAP64,
 120                                 fs->default_bitmap_type,
 121                                 start, end, real_end, descr, ret));
 122
 123         if ((end > ~0U) || (real_end > ~0U))
 124                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
 125
 126         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
 127                                            start, end, real_end,
 128                                            descr, 0,
 129                                            (ext2fs_generic_bitmap *) ret));
 130 }
 131
 132 /*
 133  * ext2fs_allocate_block_bitmap() really allocates a per-cluster
 134  * bitmap for backwards compatibility.  This function allocates a
 135  * block bitmap which is truly per-block, even if clusters/bigalloc
 136  * are enabled.  mke2fs and e2fsck need this for tracking the
 137  * allocation of the file system metadata blocks.
 138  */
 139 errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
 140                                             const char *descr,
 141                                             ext2fs_block_bitmap *ret)
 142 {
 143         __u64                   start, end, real_end;
 144         ext2fs_generic_bitmap   bmap;
 145         ext2fs_generic_bitmap_64 bmap64;
 146         errcode_t               retval;
 147
 148         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 149
 150         if (ext2fs_has_feature_journal_dev(fs->super))
 151                 return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
 152
 153         fs->write_bitmaps = ext2fs_write_bitmaps;
 154
 155         if (!fs->cluster_ratio_bits)
 156                 return ext2fs_allocate_block_bitmap(fs, descr, ret);
 157
 158         if ((fs->flags & EXT2_FLAG_64BITS) == 0)
 159                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
 160
 161         start = fs->super->s_first_data_block;
 162         end = ext2fs_blocks_count(fs->super)-1;
 163         real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
 164                     * (__u64) fs->group_desc_count)-1 + start;
 165
 166         retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
 167                                            fs->default_bitmap_type, start,
 168                                            end, real_end, descr, &bmap);
 169         if (retval)
 170                 return retval;
 171         bmap64 = (ext2fs_generic_bitmap_64) bmap;
 172         bmap64->cluster_bits = 0;
 173         *ret = bmap;
 174         return 0;
 175 }
 176
 177 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
 178 {
 179         ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) bitmap;
 180
 181         if (!EXT2FS_IS_64_BITMAP(bmap))
 182                 return 0;
 183
 184         return bmap->cluster_bits;
 185 }
 186
 187 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
 188                                         ext2_ino_t end, ext2_ino_t *oend)
 189 {
 190         __u64 tmp_oend;
 191         int retval;
 192
 193         retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
 194                                                EXT2_ET_FUDGE_INODE_BITMAP_END,
 195                                                end, &tmp_oend);
 196         if (oend)
 197                 *oend = tmp_oend;
 198         return retval;
 199 }
 200
 201 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
 202                                         blk_t end, blk_t *oend)
 203 {
 204         return (ext2fs_fudge_generic_bitmap_end(bitmap,
 205                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 206                                                 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 207                                                 end, oend));
 208 }
 209
 210 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
 211                                          blk64_t end, blk64_t *oend)
 212 {
 213         return (ext2fs_fudge_generic_bmap_end(bitmap,
 214                                               EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 215                                               end, oend));
 216 }
 217
 218 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
 219 {
 220         ext2fs_clear_generic_bmap(bitmap);
 221 }
 222
 223 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
 224 {
 225         ext2fs_clear_generic_bmap(bitmap);
 226 }
 227
 228 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
 229                                      ext2fs_inode_bitmap bmap)
 230 {
 231         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
 232                                              new_end, new_real_end, bmap));
 233 }
 234
 235 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
 236                                       ext2fs_inode_bitmap bmap)
 237 {
 238         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 239 }
 240
 241 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
 242                                      ext2fs_block_bitmap bmap)
 243 {
 244         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
 245                                              new_end, new_real_end, bmap));
 246 }
 247
 248 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
 249                                       ext2fs_block_bitmap bmap)
 250 {
 251         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 252 }
 253
 254 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
 255                                       ext2fs_block_bitmap bm2)
 256 {
 257         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
 258                                             bm1, bm2));
 259 }
 260
 261 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
 262                                       ext2fs_inode_bitmap bm2)
 263 {
 264         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
 265                                             bm1, bm2));
 266 }
 267
 268 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 269                                         ext2_ino_t start, unsigned int num,
 270                                         void *in)
 271 {
 272         return (ext2fs_set_generic_bitmap_range(bmap,
 273                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 274                                                 start, num, in));
 275 }
 276
 277 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 278                                          __u64 start, size_t num,
 279                                          void *in)
 280 {
 281         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 282 }
 283
 284 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 285                                         ext2_ino_t start, unsigned int num,
 286                                         void *out)
 287 {
 288         return (ext2fs_get_generic_bitmap_range(bmap,
 289                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 290                                                 start, num, out));
 291 }
 292
 293 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 294                                          __u64 start, size_t num,
 295                                          void *out)
 296 {
 297         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 298 }
 299
 300 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
 301                                         blk_t start, unsigned int num,
 302                                         void *in)
 303 {
 304         return (ext2fs_set_generic_bitmap_range(bmap,
 305                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 306                                                 start, num, in));
 307 }
 308
 309 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
 310                                          blk64_t start, size_t num,
 311                                          void *in)
 312 {
 313         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 314 }
 315
 316 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
 317                                         blk_t start, unsigned int num,
 318                                         void *out)
 319 {
 320         return (ext2fs_get_generic_bitmap_range(bmap,
 321                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 322                                                 start, num, out));
 323 }
 324
 325 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
 326                                          blk64_t start, size_t num,
 327                                          void *out)
 328 {
 329         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 330 }