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         ext2fs_generic_bitmap_64 bmap64;
 129         errcode_t               retval;
 130
 131         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 132
 133         fs->write_bitmaps = ext2fs_write_bitmaps;
 134
 135         if (!fs->cluster_ratio_bits)
 136                 return ext2fs_allocate_block_bitmap(fs, descr, ret);
 137
 138         if ((fs->flags & EXT2_FLAG_64BITS) == 0)
 139                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
 140
 141         start = fs->super->s_first_data_block;
 142         end = ext2fs_blocks_count(fs->super)-1;
 143         real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
 144                     * (__u64) fs->group_desc_count)-1 + start;
 145
 146         retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
 147                                            fs->default_bitmap_type, start,
 148                                            end, real_end, descr, &bmap);
 149         if (retval)
 150                 return retval;
 151         bmap64 = (ext2fs_generic_bitmap_64) bmap;
 152         bmap64->cluster_bits = 0;
 153         *ret = bmap;
 154         return 0;
 155 }
 156
 157 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
 158 {
 159         ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) bitmap;
 160
 161         if (!EXT2FS_IS_64_BITMAP(bmap))
 162                 return 0;
 163
 164         return bmap->cluster_bits;
 165 }
 166
 167 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
 168                                         ext2_ino_t end, ext2_ino_t *oend)
 169 {
 170         __u64 tmp_oend;
 171         int retval;
 172
 173         retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
 174                                                EXT2_ET_FUDGE_INODE_BITMAP_END,
 175                                                end, &tmp_oend);
 176         if (oend)
 177                 *oend = tmp_oend;
 178         return retval;
 179 }
 180
 181 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
 182                                         blk_t end, blk_t *oend)
 183 {
 184         return (ext2fs_fudge_generic_bitmap_end(bitmap,
 185                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 186                                                 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 187                                                 end, oend));
 188 }
 189
 190 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
 191                                          blk64_t end, blk64_t *oend)
 192 {
 193         return (ext2fs_fudge_generic_bmap_end(bitmap,
 194                                               EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 195                                               end, oend));
 196 }
 197
 198 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
 199 {
 200         ext2fs_clear_generic_bmap(bitmap);
 201 }
 202
 203 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
 204 {
 205         ext2fs_clear_generic_bmap(bitmap);
 206 }
 207
 208 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
 209                                      ext2fs_inode_bitmap bmap)
 210 {
 211         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
 212                                              new_end, new_real_end, bmap));
 213 }
 214
 215 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
 216                                       ext2fs_inode_bitmap bmap)
 217 {
 218         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 219 }
 220
 221 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
 222                                      ext2fs_block_bitmap bmap)
 223 {
 224         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
 225                                              new_end, new_real_end, bmap));
 226 }
 227
 228 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
 229                                       ext2fs_block_bitmap bmap)
 230 {
 231         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 232 }
 233
 234 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
 235                                       ext2fs_block_bitmap bm2)
 236 {
 237         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
 238                                             bm1, bm2));
 239 }
 240
 241 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
 242                                       ext2fs_inode_bitmap bm2)
 243 {
 244         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
 245                                             bm1, bm2));
 246 }
 247
 248 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 249                                         ext2_ino_t start, unsigned int num,
 250                                         void *in)
 251 {
 252         return (ext2fs_set_generic_bitmap_range(bmap,
 253                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 254                                                 start, num, in));
 255 }
 256
 257 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 258                                          __u64 start, size_t num,
 259                                          void *in)
 260 {
 261         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 262 }
 263
 264 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 265                                         ext2_ino_t start, unsigned int num,
 266                                         void *out)
 267 {
 268         return (ext2fs_get_generic_bitmap_range(bmap,
 269                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 270                                                 start, num, out));
 271 }
 272
 273 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 274                                          __u64 start, size_t num,
 275                                          void *out)
 276 {
 277         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 278 }
 279
 280 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
 281                                         blk_t start, unsigned int num,
 282                                         void *in)
 283 {
 284         return (ext2fs_set_generic_bitmap_range(bmap,
 285                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 286                                                 start, num, in));
 287 }
 288
 289 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
 290                                          blk64_t start, size_t num,
 291                                          void *in)
 292 {
 293         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 294 }
 295
 296 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
 297                                         blk_t start, unsigned int num,
 298                                         void *out)
 299 {
 300         return (ext2fs_get_generic_bitmap_range(bmap,
 301                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 302                                                 start, num, out));
 303 }
 304
 305 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
 306                                          blk64_t start, size_t num,
 307                                          void *out)
 308 {
 309         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 310 }