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 = (__u64)EXT2_INODES_PER_GROUP(fs->super) *
  66                 fs->group_desc_count;
  67
  68         /* Are we permitted to use new-style bitmaps? */
  69         if (fs->flags & EXT2_FLAG_64BITS)
  70                 return (ext2fs_alloc_generic_bmap(fs,
  71                                 EXT2_ET_MAGIC_INODE_BITMAP64,
  72                                 fs->default_bitmap_type,
  73                                 start, end, real_end, descr, ret));
  74
  75         /* Otherwise, check to see if the file system is small enough
  76          * to use old-style 32-bit bitmaps */
  77         if ((end > ~0U) || (real_end > ~0U))
  78                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
  79
  80         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
  81                                          start, end, real_end,
  82                                          descr, 0,
  83                                          (ext2fs_generic_bitmap *) ret));
  84 }
  85
  86 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
  87                                        const char *descr,
  88                                        ext2fs_block_bitmap *ret)
  89 {
  90         __u64           start, end, real_end;
  91
  92         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  93
  94         fs->write_bitmaps = ext2fs_write_bitmaps;
  95
  96         start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
  97         end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
  98         real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
  99                     * (__u64) fs->group_desc_count)-1 + start;
 100
 101         if (fs->flags & EXT2_FLAG_64BITS)
 102                 return (ext2fs_alloc_generic_bmap(fs,
 103                                 EXT2_ET_MAGIC_BLOCK_BITMAP64,
 104                                 fs->default_bitmap_type,
 105                                 start, end, real_end, descr, ret));
 106
 107         if ((end > ~0U) || (real_end > ~0U))
 108                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
 109
 110         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
 111                                            start, end, real_end,
 112                                            descr, 0,
 113                                            (ext2fs_generic_bitmap *) ret));
 114 }
 115
 116 /*
 117  * ext2fs_allocate_block_bitmap() really allocates a per-cluster
 118  * bitmap for backwards compatibility.  This function allocates a
 119  * block bitmap which is truly per-block, even if clusters/bigalloc
 120  * are enabled.  mke2fs and e2fsck need this for tracking the
 121  * allocation of the file system metadata blocks.
 122  */
 123 errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
 124                                             const char *descr,
 125                                             ext2fs_block_bitmap *ret)
 126 {
 127         __u64                   start, end, real_end;
 128         ext2fs_generic_bitmap   bmap;
 129         ext2fs_generic_bitmap_64 bmap64;
 130         errcode_t               retval;
 131
 132         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 133
 134         fs->write_bitmaps = ext2fs_write_bitmaps;
 135
 136         if (!fs->cluster_ratio_bits)
 137                 return ext2fs_allocate_block_bitmap(fs, descr, ret);
 138
 139         if ((fs->flags & EXT2_FLAG_64BITS) == 0)
 140                 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
 141
 142         start = fs->super->s_first_data_block;
 143         end = ext2fs_blocks_count(fs->super)-1;
 144         real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
 145                     * (__u64) fs->group_desc_count)-1 + start;
 146
 147         retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
 148                                            fs->default_bitmap_type, start,
 149                                            end, real_end, descr, &bmap);
 150         if (retval)
 151                 return retval;
 152         bmap64 = (ext2fs_generic_bitmap_64) bmap;
 153         bmap64->cluster_bits = 0;
 154         *ret = bmap;
 155         return 0;
 156 }
 157
 158 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
 159 {
 160         ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) bitmap;
 161
 162         if (!EXT2FS_IS_64_BITMAP(bmap))
 163                 return 0;
 164
 165         return bmap->cluster_bits;
 166 }
 167
 168 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
 169                                         ext2_ino_t end, ext2_ino_t *oend)
 170 {
 171         __u64 tmp_oend;
 172         int retval;
 173
 174         retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
 175                                                EXT2_ET_FUDGE_INODE_BITMAP_END,
 176                                                end, &tmp_oend);
 177         if (oend)
 178                 *oend = tmp_oend;
 179         return retval;
 180 }
 181
 182 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
 183                                         blk_t end, blk_t *oend)
 184 {
 185         return (ext2fs_fudge_generic_bitmap_end(bitmap,
 186                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 187                                                 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 188                                                 end, oend));
 189 }
 190
 191 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
 192                                          blk64_t end, blk64_t *oend)
 193 {
 194         return (ext2fs_fudge_generic_bmap_end(bitmap,
 195                                               EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 196                                               end, oend));
 197 }
 198
 199 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
 200 {
 201         ext2fs_clear_generic_bmap(bitmap);
 202 }
 203
 204 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
 205 {
 206         ext2fs_clear_generic_bmap(bitmap);
 207 }
 208
 209 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
 210                                      ext2fs_inode_bitmap bmap)
 211 {
 212         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
 213                                              new_end, new_real_end, bmap));
 214 }
 215
 216 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
 217                                       ext2fs_inode_bitmap bmap)
 218 {
 219         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 220 }
 221
 222 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
 223                                      ext2fs_block_bitmap bmap)
 224 {
 225         return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
 226                                              new_end, new_real_end, bmap));
 227 }
 228
 229 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
 230                                       ext2fs_block_bitmap bmap)
 231 {
 232         return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
 233 }
 234
 235 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
 236                                       ext2fs_block_bitmap bm2)
 237 {
 238         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
 239                                             bm1, bm2));
 240 }
 241
 242 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
 243                                       ext2fs_inode_bitmap bm2)
 244 {
 245         return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
 246                                             bm1, bm2));
 247 }
 248
 249 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 250                                         ext2_ino_t start, unsigned int num,
 251                                         void *in)
 252 {
 253         return (ext2fs_set_generic_bitmap_range(bmap,
 254                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 255                                                 start, num, in));
 256 }
 257
 258 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 259                                          __u64 start, size_t num,
 260                                          void *in)
 261 {
 262         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 263 }
 264
 265 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
 266                                         ext2_ino_t start, unsigned int num,
 267                                         void *out)
 268 {
 269         return (ext2fs_get_generic_bitmap_range(bmap,
 270                                                 EXT2_ET_MAGIC_INODE_BITMAP,
 271                                                 start, num, out));
 272 }
 273
 274 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
 275                                          __u64 start, size_t num,
 276                                          void *out)
 277 {
 278         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 279 }
 280
 281 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
 282                                         blk_t start, unsigned int num,
 283                                         void *in)
 284 {
 285         return (ext2fs_set_generic_bitmap_range(bmap,
 286                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 287                                                 start, num, in));
 288 }
 289
 290 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
 291                                          blk64_t start, size_t num,
 292                                          void *in)
 293 {
 294         return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
 295 }
 296
 297 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
 298                                         blk_t start, unsigned int num,
 299                                         void *out)
 300 {
 301         return (ext2fs_get_generic_bitmap_range(bmap,
 302                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 303                                                 start, num, out));
 304 }
 305
 306 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
 307                                          blk64_t start, size_t num,
 308                                          void *out)
 309 {
 310         return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
 311 }