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