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