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 Public
   9  * License.
  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
  30 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
  31 {
  32         ext2fs_free_generic_bitmap(bitmap);
  33 }
  34
  35 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
  36 {
  37         ext2fs_free_generic_bitmap(bitmap);
  38 }
  39
  40 errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
  41                              ext2fs_generic_bitmap *dest)
  42 {
  43         return (ext2fs_copy_generic_bitmap(src, dest));
  44 }
  45
  46 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
  47 {
  48         ext2fs_set_generic_bitmap_padding(map);
  49 }
  50
  51 errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
  52                                        const char *descr,
  53                                        ext2fs_inode_bitmap *ret)
  54 {
  55         errcode_t       retval;
  56         __u32           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         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
  67                                            start, end, real_end,
  68                                            descr, 0, ret));
  69 }
  70
  71 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
  72                                        const char *descr,
  73                                        ext2fs_block_bitmap *ret)
  74 {
  75         errcode_t       retval;
  76         __u32           start, end, real_end;
  77
  78         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  79
  80         fs->write_bitmaps = ext2fs_write_bitmaps;
  81
  82         start = fs->super->s_first_data_block;
  83         end = fs->super->s_blocks_count-1;
  84         real_end = (EXT2_BLOCKS_PER_GROUP(fs->super)
  85                     * fs->group_desc_count)-1 + start;
  86
  87         return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
  88                                            start, end, real_end,
  89                                            descr, 0, ret));
  90 }
  91
  92 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
  93                                         ext2_ino_t end, ext2_ino_t *oend)
  94 {
  95
  96         return (ext2fs_fudge_generic_bitmap_end(bitmap,
  97                                                 EXT2_ET_MAGIC_INODE_BITMAP,
  98                                                 EXT2_ET_FUDGE_INODE_BITMAP_END,
  99                                                 end, oend));
 100 }
 101
 102 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
 103                                         blk_t end, blk_t *oend)
 104 {
 105         return (ext2fs_fudge_generic_bitmap_end(bitmap,
 106                                                 EXT2_ET_MAGIC_BLOCK_BITMAP,
 107                                                 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
 108                                                 end, oend));
 109 }
 110
 111 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
 112 {
 113         ext2fs_clear_generic_bitmap(bitmap);
 114 }
 115
 116 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
 117 {
 118         ext2fs_clear_generic_bitmap(bitmap);
 119 }