1 | /*
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2 | * rs_bitmap.c --- routine for changing the size of a bitmap
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3 | *
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4 | * Copyright (C) 1996, 1997 Theodore Ts'o.
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5 | *
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6 | * %Begin-Header%
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7 | * This file may be redistributed under the terms of the GNU Public
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8 | * License.
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9 | * %End-Header%
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10 | */
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11 |
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12 | #include <stdio.h>
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13 | #include <string.h>
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14 | #if HAVE_UNISTD_H
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15 | #include <unistd.h>
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16 | #endif
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17 | #include <fcntl.h>
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18 | #include <time.h>
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19 | #ifdef HAVE_SYS_STAT_H
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20 | #include <sys/stat.h>
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21 | #endif
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22 | #ifdef HAVE_SYS_TYPES_H
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23 | #include <sys/types.h>
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24 | #endif
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25 |
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26 | #include "ext2_fs.h"
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27 | #include "ext2fs.h"
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28 |
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29 | errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end,
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30 | ext2fs_generic_bitmap bmap)
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31 | {
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32 | errcode_t retval;
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33 | size_t size, new_size;
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34 | __u32 bitno;
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35 |
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36 | if (!bmap)
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37 | return EXT2_ET_INVALID_ARGUMENT;
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38 |
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39 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP);
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40 |
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41 | /*
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42 | * If we're expanding the bitmap, make sure all of the new
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43 | * parts of the bitmap are zero.
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44 | */
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45 | if (new_end > bmap->end) {
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46 | bitno = bmap->real_end;
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47 | if (bitno > new_end)
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48 | bitno = new_end;
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49 | for (; bitno > bmap->end; bitno--)
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50 | ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap);
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51 | }
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52 | if (new_real_end == bmap->real_end) {
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53 | bmap->end = new_end;
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54 | return 0;
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55 | }
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56 |
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57 | size = ((bmap->real_end - bmap->start) / 8) + 1;
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58 | new_size = ((new_real_end - bmap->start) / 8) + 1;
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59 |
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60 | if (size != new_size) {
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61 | retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap);
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62 | if (retval)
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63 | return retval;
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64 | }
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65 | if (new_size > size)
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66 | memset(bmap->bitmap + size, 0, new_size - size);
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67 |
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68 | bmap->end = new_end;
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69 | bmap->real_end = new_real_end;
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70 | return 0;
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71 | }
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72 |
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73 | errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
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74 | ext2fs_inode_bitmap bmap)
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75 | {
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76 | errcode_t retval;
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77 |
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78 | if (!bmap)
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79 | return EXT2_ET_INVALID_ARGUMENT;
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80 |
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81 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP);
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82 |
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83 | bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
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84 | retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
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85 | bmap);
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86 | bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
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87 | return retval;
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88 | }
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89 |
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90 | errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
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91 | ext2fs_block_bitmap bmap)
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92 | {
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93 | errcode_t retval;
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94 |
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95 | if (!bmap)
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96 | return EXT2_ET_INVALID_ARGUMENT;
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97 |
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98 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
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99 |
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100 | bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
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101 | retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
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102 | bmap);
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103 | bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
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104 | return retval;
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105 | }
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106 |
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