[1765] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * bitmaps.c --- routines to read, write, and manipulate the inode and
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| 4 | * block bitmaps.
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| 5 | *
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| 6 | * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
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| 7 | *
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| 8 | * %Begin-Header%
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| 9 | * This file may be redistributed under the terms of the GNU Public
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| 10 | * License.
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| 11 | * %End-Header%
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| 12 | */
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| 13 |
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| 14 | #include <stdio.h>
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| 15 | #include <string.h>
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| 16 | #if HAVE_UNISTD_H
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| 17 | #include <unistd.h>
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| 18 | #endif
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| 19 | #include <fcntl.h>
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| 20 | #include <time.h>
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| 21 | #if HAVE_SYS_STAT_H
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| 22 | #include <sys/stat.h>
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| 23 | #endif
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| 24 | #if HAVE_SYS_TYPES_H
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| 25 | #include <sys/types.h>
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| 26 | #endif
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| 27 |
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| 28 | #include "ext2_fs.h"
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| 29 | #include "ext2fs.h"
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| 30 |
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| 31 | static errcode_t make_bitmap(__u32 start, __u32 end, __u32 real_end,
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| 32 | const char *descr, char *init_map,
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| 33 | ext2fs_generic_bitmap *ret)
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| 34 | {
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| 35 | ext2fs_generic_bitmap bitmap;
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| 36 | errcode_t retval;
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| 37 | size_t size;
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| 38 |
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| 39 | retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap),
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| 40 | &bitmap);
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| 41 | if (retval)
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| 42 | return retval;
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| 43 |
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| 44 | bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
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| 45 | bitmap->fs = NULL;
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| 46 | bitmap->start = start;
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| 47 | bitmap->end = end;
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| 48 | bitmap->real_end = real_end;
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| 49 | bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;
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| 50 | if (descr) {
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| 51 | retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);
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| 52 | if (retval) {
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| 53 | ext2fs_free_mem(&bitmap);
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| 54 | return retval;
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| 55 | }
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| 56 | strcpy(bitmap->description, descr);
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| 57 | } else
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| 58 | bitmap->description = 0;
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| 59 |
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| 60 | size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
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| 61 | retval = ext2fs_get_mem(size, &bitmap->bitmap);
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| 62 | if (retval) {
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| 63 | ext2fs_free_mem(&bitmap->description);
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| 64 | ext2fs_free_mem(&bitmap);
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| 65 | return retval;
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| 66 | }
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| 67 |
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| 68 | if (init_map)
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| 69 | memcpy(bitmap->bitmap, init_map, size);
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| 70 | else
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| 71 | memset(bitmap->bitmap, 0, size);
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| 72 | *ret = bitmap;
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| 73 | return 0;
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| 74 | }
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| 75 |
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| 76 | errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
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| 77 | __u32 end,
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| 78 | __u32 real_end,
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| 79 | const char *descr,
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| 80 | ext2fs_generic_bitmap *ret)
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| 81 | {
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| 82 | return make_bitmap(start, end, real_end, descr, 0, ret);
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| 83 | }
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| 84 |
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| 85 | errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
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| 86 | ext2fs_generic_bitmap *dest)
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| 87 | {
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| 88 | errcode_t retval;
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| 89 | ext2fs_generic_bitmap new_map;
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| 90 |
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| 91 | retval = make_bitmap(src->start, src->end, src->real_end,
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| 92 | src->description, src->bitmap, &new_map);
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| 93 | if (retval)
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| 94 | return retval;
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| 95 | new_map->magic = src->magic;
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| 96 | new_map->fs = src->fs;
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| 97 | new_map->base_error_code = src->base_error_code;
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| 98 | *dest = new_map;
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| 99 | return 0;
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| 100 | }
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| 101 |
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| 102 | void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
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| 103 | {
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| 104 | __u32 i, j;
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| 105 |
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| 106 | for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++)
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| 107 | ext2fs_set_bit(j, map->bitmap);
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| 108 | }
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| 109 |
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| 110 | errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
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| 111 | const char *descr,
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| 112 | ext2fs_inode_bitmap *ret)
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| 113 | {
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| 114 | ext2fs_inode_bitmap bitmap;
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| 115 | errcode_t retval;
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| 116 | __u32 start, end, real_end;
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| 117 |
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| 118 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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| 119 |
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| 120 | fs->write_bitmaps = ext2fs_write_bitmaps;
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| 121 |
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| 122 | start = 1;
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| 123 | end = fs->super->s_inodes_count;
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| 124 | real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
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| 125 |
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| 126 | retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
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| 127 | descr, &bitmap);
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| 128 | if (retval)
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| 129 | return retval;
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| 130 |
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| 131 | bitmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
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| 132 | bitmap->fs = fs;
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| 133 | bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;
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| 134 |
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| 135 | *ret = bitmap;
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| 136 | return 0;
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| 137 | }
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| 138 |
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| 139 | errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
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| 140 | const char *descr,
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| 141 | ext2fs_block_bitmap *ret)
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| 142 | {
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| 143 | ext2fs_block_bitmap bitmap;
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| 144 | errcode_t retval;
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| 145 | __u32 start, end, real_end;
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| 146 |
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| 147 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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| 148 |
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| 149 | fs->write_bitmaps = ext2fs_write_bitmaps;
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| 150 |
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| 151 | start = fs->super->s_first_data_block;
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| 152 | end = fs->super->s_blocks_count-1;
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| 153 | real_end = (EXT2_BLOCKS_PER_GROUP(fs->super)
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| 154 | * fs->group_desc_count)-1 + start;
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| 155 |
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| 156 | retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
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| 157 | descr, &bitmap);
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| 158 | if (retval)
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| 159 | return retval;
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| 160 |
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| 161 | bitmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
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| 162 | bitmap->fs = fs;
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| 163 | bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;
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| 164 |
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| 165 | *ret = bitmap;
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| 166 | return 0;
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| 167 | }
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| 168 |
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| 169 | errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
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| 170 | ext2_ino_t end, ext2_ino_t *oend)
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| 171 | {
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| 172 | EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP);
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| 173 |
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| 174 | if (end > bitmap->real_end)
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| 175 | return EXT2_ET_FUDGE_INODE_BITMAP_END;
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| 176 | if (oend)
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| 177 | *oend = bitmap->end;
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| 178 | bitmap->end = end;
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| 179 | return 0;
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| 180 | }
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| 181 |
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| 182 | errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
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| 183 | blk_t end, blk_t *oend)
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| 184 | {
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| 185 | EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
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| 186 |
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| 187 | if (end > bitmap->real_end)
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| 188 | return EXT2_ET_FUDGE_BLOCK_BITMAP_END;
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| 189 | if (oend)
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| 190 | *oend = bitmap->end;
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| 191 | bitmap->end = end;
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| 192 | return 0;
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| 193 | }
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| 194 |
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| 195 | void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
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| 196 | {
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| 197 | if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))
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| 198 | return;
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| 199 |
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| 200 | memset(bitmap->bitmap, 0,
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| 201 | (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
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| 202 | }
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| 203 |
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| 204 | void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
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| 205 | {
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| 206 | if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))
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| 207 | return;
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| 208 |
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| 209 | memset(bitmap->bitmap, 0,
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| 210 | (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
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| 211 | }
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