| 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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