[3320] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * rs_bitmap.c --- routine for changing the size of a bitmap
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 1996, 1997 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 | #ifdef HAVE_SYS_STAT_H
|
---|
| 21 | #include <sys/stat.h>
|
---|
| 22 | #endif
|
---|
| 23 | #ifdef HAVE_SYS_TYPES_H
|
---|
| 24 | #include <sys/types.h>
|
---|
| 25 | #endif
|
---|
| 26 |
|
---|
| 27 | #include "ext2_fs.h"
|
---|
| 28 | #include "ext2fs.h"
|
---|
| 29 |
|
---|
| 30 | errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end,
|
---|
| 31 | ext2fs_generic_bitmap bmap)
|
---|
| 32 | {
|
---|
| 33 | errcode_t retval;
|
---|
| 34 | size_t size, new_size;
|
---|
| 35 | __u32 bitno;
|
---|
| 36 |
|
---|
| 37 | if (!bmap)
|
---|
| 38 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 39 |
|
---|
| 40 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP);
|
---|
| 41 |
|
---|
| 42 | /*
|
---|
| 43 | * If we're expanding the bitmap, make sure all of the new
|
---|
| 44 | * parts of the bitmap are zero.
|
---|
| 45 | */
|
---|
| 46 | if (new_end > bmap->end) {
|
---|
| 47 | bitno = bmap->real_end;
|
---|
| 48 | if (bitno > new_end)
|
---|
| 49 | bitno = new_end;
|
---|
| 50 | for (; bitno > bmap->end; bitno--)
|
---|
| 51 | ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap);
|
---|
| 52 | }
|
---|
| 53 | if (new_real_end == bmap->real_end) {
|
---|
| 54 | bmap->end = new_end;
|
---|
| 55 | return 0;
|
---|
| 56 | }
|
---|
| 57 |
|
---|
| 58 | size = ((bmap->real_end - bmap->start) / 8) + 1;
|
---|
| 59 | new_size = ((new_real_end - bmap->start) / 8) + 1;
|
---|
| 60 |
|
---|
| 61 | if (size != new_size) {
|
---|
| 62 | retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap);
|
---|
| 63 | if (retval)
|
---|
| 64 | return retval;
|
---|
| 65 | }
|
---|
| 66 | if (new_size > size)
|
---|
| 67 | memset(bmap->bitmap + size, 0, new_size - size);
|
---|
| 68 |
|
---|
| 69 | bmap->end = new_end;
|
---|
| 70 | bmap->real_end = new_real_end;
|
---|
| 71 | return 0;
|
---|
| 72 | }
|
---|
| 73 |
|
---|
| 74 | errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
|
---|
| 75 | ext2fs_inode_bitmap bmap)
|
---|
| 76 | {
|
---|
| 77 | errcode_t retval;
|
---|
| 78 |
|
---|
| 79 | if (!bmap)
|
---|
| 80 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 81 |
|
---|
| 82 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP);
|
---|
| 83 |
|
---|
| 84 | bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
|
---|
| 85 | retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
|
---|
| 86 | bmap);
|
---|
| 87 | bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
|
---|
| 88 | return retval;
|
---|
| 89 | }
|
---|
| 90 |
|
---|
| 91 | errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
|
---|
| 92 | ext2fs_block_bitmap bmap)
|
---|
| 93 | {
|
---|
| 94 | errcode_t retval;
|
---|
| 95 |
|
---|
| 96 | if (!bmap)
|
---|
| 97 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 98 |
|
---|
| 99 | EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
|
---|
| 100 |
|
---|
| 101 | bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
|
---|
| 102 | retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
|
---|
| 103 | bmap);
|
---|
| 104 | bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
|
---|
| 105 | return retval;
|
---|
| 106 | }
|
---|