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 #include "bmap64.h"
  31
  32 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
  33 {
  34         ext2fs_free_generic_bmap(bitmap);
  35 }
  36
  37 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
  38 {
  39         ext2fs_free_generic_bmap(bitmap);
  40 }
  41
  42 errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
  43                              ext2fs_generic_bitmap *dest)
  44 {
  45         return (ext2fs_copy_generic_bmap(src, dest));
  46 }
  47 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
  48 {
  49         ext2fs_set_generic_bmap_padding(map);
  50 }
  51
  52 errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
  53                                        const char *descr,
  54                                        ext2fs_inode_bitmap *ret)
  55 {
  56         __u64           start, end, real_end;
  57
  58         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  59
  60         fs->write_bitmaps = ext2fs_write_bitmaps;
  61
  62         start = 1;
  63         end = fs->super->s_inodes_count;
  64         real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
  65
  66         /* Are we permitted to use new-style bitmaps? */
  67         if (fs->flags & EXT2_FLAG_64BITS)
  68                 return (ext2fs_alloc_generic_bmap(fs,
  69                                   EXT2_ET_MAGIC_INODE_BITMAP64,
  70                                   EXT2FS_BMAP64_BITARRAY,
  71                                   start, end, real_end, descr, ret));
  72
  73         /* Otherwise, check to see if the file system is small enough
  74          * to use old-style 32-bit bitmaps */
  75         if ((end > ~0U) || (real_end > ~0U))
  76                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
  77
  78         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
  79                                          start, end, real_end,
  80                                          descr, 0,
  81                                          (ext2fs_generic_bitmap *) ret));
  82 }
  83
  84 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
  85                                        const char *descr,
  86                                        ext2fs_block_bitmap *ret)
  87 {
  88         __u64           start, end, real_end;
  89
  90         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  91
  92         fs->write_bitmaps = ext2fs_write_bitmaps;
  93
  94         start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
  95         end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
  96         real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
  97                     * (__u64) fs->group_desc_count)-1 + start;
  98
  99         if (fs->flags & EXT2_FLAG_64BITS)
 100                 return (ext2fs_alloc_generic_bmap(fs,
 101                                   EXT2_ET_MAGIC_BLOCK_BITMAP64,
 102                                   EXT2FS_BMAP64_BITARRAY,
 103                                   start, end, real_end, descr, ret));
 104
 105         if ((end > ~0U) || (real_end > ~0U))
 106                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
 107
 108         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
 109                                            start, end, real_end,
 110                                            descr, 0,
 111                                            (ext2fs_generic_bitmap *) ret));
 112 }
 113
 114 /*
 115  * ext2fs_allocate_block_bitmap() really allocates a per-cluster
 116  * bitmap for backwards compatibility.  This function allocates a
 117  * block bitmap which is truly per-block, even if clusters/bigalloc
 118  * are enabled.  mke2fs and e2fsck need this for tracking the
 119  * allocation of the file system metadata blocks.
 120  */
 121 errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
 122                                             const char *descr,
 123                                             ext2fs_block_bitmap *ret)
 124 {
 125         __u64                   start, end, real_end;
 126         ext2fs_generic_bitmap   bmap;
 127         errcode_t               retval;
 128
 129         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 130
 131         fs->write_bitmaps = ext2fs_write_bitmaps;
 132
 133         if (!fs->cluster_ratio_bits)
 134                 return ext2fs_allocate_block_bitmap(fs, descr, ret);
 135
 136         if ((fs->flags & EXT2_FLAG_64BITS) == 0)
 137                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
 138
 139         start = fs->super->s_first_data_block;
 140         end = ext2fs_blocks_count(fs->super)-1;
 141         real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
 142                     * (__u64) fs->group_desc_count)-1 + start;
 143
 144         retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
 145                                            EXT2FS_BMAP64_BITARRAY, start,
 146                                            end, real_end, descr, &bmap);
 147         if (retval)
 148                 return retval;
 149         bmap->cluster_bits = 0;
 150         *ret = bmap;
 151         return 0;
 152 }
 153
 154 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
 155 {
 156         ext2fs_generic_bitmap bmap = bitmap;
 157
 158         if (!EXT2FS_IS_64_BITMAP(bmap))
 159                 return 0;
 160
 161         return bmap->cluster_bits;
 162 }
 163
 164 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
 165                                         ext2_ino_t end, ext2_ino_t *oend)
 166 {
 167         __u64 tmp_oend;
 168         int retval;
 169
 170         retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
 171                                                EXT2_ET_FUDGE_INODE_BITMAP_END,
 172                                                end, &tmp_oend);
 173         if (oend)
 174                 *oend = tmp_oend;
 175         return retval;
 176 }
 177
 178 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
 179                                         blk_t end, blk_t *oend)
 180 {
 181         return (ext2fs_fudge_generic_bitmap_end(bitmap,
 182                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 183                                                 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 184                                                 end, oend));
 185 }
 186
 187 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
 188                                          blk64_t end, blk64_t *oend)
 189 {
 190         return (ext2fs_fudge_generic_bmap_end(bitmap,
 191                                               EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 192                                               end, oend));
 193 }
 194
 195 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
 196 {
 197         ext2fs_clear_generic_bmap(bitmap);
 198 }
 199
 200 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
 201 {
 202         ext2fs_clear_generic_bmap(bitmap);
 203 }
 204
 205 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
 206                                      ext2fs_inode_bitmap bmap)
 207 {
 208         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
 209                                              new_end, new_real_end, bmap));
 210 }
 211
 212 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
 213                                       ext2fs_inode_bitmap bmap)
 214 {
 215         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 216 }
 217
 218 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
 219                                      ext2fs_block_bitmap bmap)
 220 {
 221         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
 222                                              new_end, new_real_end, bmap));
 223 }
 224
 225 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
 226                                       ext2fs_block_bitmap bmap)
 227 {
 228         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 229 }
 230
 231 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
 232                                       ext2fs_block_bitmap bm2)
 233 {
 234         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
 235                                             bm1, bm2));
 236 }
 237
 238 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
 239                                       ext2fs_inode_bitmap bm2)
 240 {
 241         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
 242                                             bm1, bm2));
 243 }
 244
 245 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 246                                         ext2_ino_t start, unsigned int num,
 247                                         void *in)
 248 {
 249         return (ext2fs_set_generic_bitmap_range(bmap,
 250                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 251                                                 start, num, in));
 252 }
 253
 254 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 255                                          __u64 start, size_t num,
 256                                          void *in)
 257 {
 258         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 259 }
 260
 261 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 262                                         ext2_ino_t start, unsigned int num,
 263                                         void *out)
 264 {
 265         return (ext2fs_get_generic_bitmap_range(bmap,
 266                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 267                                                 start, num, out));
 268 }
 269
 270 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 271                                          __u64 start, size_t num,
 272                                          void *out)
 273 {
 274         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 275 }
 276
 277 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
 278                                         blk_t start, unsigned int num,
 279                                         void *in)
 280 {
 281         return (ext2fs_set_generic_bitmap_range(bmap,
 282                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 283                                                 start, num, in));
 284 }
 285
 286 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
 287                                          blk64_t start, size_t num,
 288                                          void *in)
 289 {
 290         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 291 }
 292
 293 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
 294                                         blk_t start, unsigned int num,
 295                                         void *out)
 296 {
 297         return (ext2fs_get_generic_bitmap_range(bmap,
 298                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 299                                                 start, num, out));
 300 }
 301
 302 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
 303                                          blk64_t start, size_t num,
 304                                          void *out)
 305 {
 306         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 307 }