[821] | 1 | /*
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| 2 | * badblocks.c --- routines to manipulate the bad block structure
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| 3 | *
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| 4 | * Copyright (C) 1994, 1995, 1996 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 | #if HAVE_SYS_STAT_H
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| 20 | #include <sys/stat.h>
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| 21 | #endif
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| 22 | #if 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 "ext2fsP.h"
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| 28 |
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| 29 | /*
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| 30 | * Helper function for making a badblocks list
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| 31 | */
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| 32 | static errcode_t make_u32_list(int size, int num, __u32 *list,
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| 33 | ext2_u32_list *ret)
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| 34 | {
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| 35 | ext2_u32_list bb;
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| 36 | errcode_t retval;
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| 37 |
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| 38 | retval = ext2fs_get_mem(sizeof(struct ext2_struct_u32_list), &bb);
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| 39 | if (retval)
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| 40 | return retval;
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| 41 | memset(bb, 0, sizeof(struct ext2_struct_u32_list));
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| 42 | bb->magic = EXT2_ET_MAGIC_BADBLOCKS_LIST;
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| 43 | bb->size = size ? size : 10;
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| 44 | bb->num = num;
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| 45 | retval = ext2fs_get_mem(bb->size * sizeof(blk_t), &bb->list);
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| 46 | if (!bb->list) {
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| 47 | ext2fs_free_mem(&bb);
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| 48 | return retval;
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| 49 | }
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| 50 | if (list)
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| 51 | memcpy(bb->list, list, bb->size * sizeof(blk_t));
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| 52 | else
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| 53 | memset(bb->list, 0, bb->size * sizeof(blk_t));
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| 54 | *ret = bb;
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| 55 | return 0;
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| 56 | }
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| 57 |
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| 58 |
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| 59 | /*
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| 60 | * This procedure creates an empty u32 list.
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| 61 | */
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| 62 | errcode_t ext2fs_u32_list_create(ext2_u32_list *ret, int size)
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| 63 | {
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| 64 | return make_u32_list(size, 0, 0, ret);
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| 65 | }
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| 66 |
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| 67 | /*
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| 68 | * This procedure creates an empty badblocks list.
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| 69 | */
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| 70 | errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret, int size)
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| 71 | {
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| 72 | return make_u32_list(size, 0, 0, (ext2_badblocks_list *) ret);
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| 73 | }
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| 74 |
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| 75 |
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| 76 | /*
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| 77 | * This procedure copies a badblocks list
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| 78 | */
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| 79 | errcode_t ext2fs_u32_copy(ext2_u32_list src, ext2_u32_list *dest)
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| 80 | {
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| 81 | errcode_t retval;
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| 82 |
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| 83 | retval = make_u32_list(src->size, src->num, src->list, dest);
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| 84 | if (retval)
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| 85 | return retval;
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| 86 | (*dest)->badblocks_flags = src->badblocks_flags;
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| 87 | return 0;
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| 88 | }
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| 89 |
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| 90 | errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
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| 91 | ext2_badblocks_list *dest)
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| 92 | {
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| 93 | return ext2fs_u32_copy((ext2_u32_list) src,
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| 94 | (ext2_u32_list *) dest);
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| 95 | }
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| 96 |
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| 97 | /*
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| 98 | * This procedure frees a badblocks list.
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| 99 | *
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| 100 | * (note: moved to closefs.c)
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| 101 | */
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| 102 |
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| 103 |
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| 104 | /*
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| 105 | * This procedure adds a block to a badblocks list.
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| 106 | */
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| 107 | errcode_t ext2fs_u32_list_add(ext2_u32_list bb, __u32 blk)
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| 108 | {
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| 109 | errcode_t retval;
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| 110 | int i, j;
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| 111 | unsigned long old_size;
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| 112 |
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| 113 | EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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| 114 |
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| 115 | if (bb->num >= bb->size) {
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| 116 | old_size = bb->size * sizeof(__u32);
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| 117 | bb->size += 100;
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| 118 | retval = ext2fs_resize_mem(old_size, bb->size * sizeof(__u32),
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| 119 | &bb->list);
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| 120 | if (retval) {
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| 121 | bb->size -= 100;
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| 122 | return retval;
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| 123 | }
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| 124 | }
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| 125 |
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| 126 | /*
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| 127 | * Add special case code for appending to the end of the list
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| 128 | */
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| 129 | i = bb->num-1;
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| 130 | if ((bb->num != 0) && (bb->list[i] == blk))
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| 131 | return 0;
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| 132 | if ((bb->num == 0) || (bb->list[i] < blk)) {
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| 133 | bb->list[bb->num++] = blk;
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| 134 | return 0;
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| 135 | }
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| 136 |
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| 137 | j = bb->num;
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| 138 | for (i=0; i < bb->num; i++) {
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| 139 | if (bb->list[i] == blk)
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| 140 | return 0;
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| 141 | if (bb->list[i] > blk) {
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| 142 | j = i;
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| 143 | break;
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| 144 | }
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| 145 | }
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| 146 | for (i=bb->num; i > j; i--)
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| 147 | bb->list[i] = bb->list[i-1];
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| 148 | bb->list[j] = blk;
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| 149 | bb->num++;
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| 150 | return 0;
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| 151 | }
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| 152 |
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| 153 | errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb, blk_t blk)
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| 154 | {
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| 155 | return ext2fs_u32_list_add((ext2_u32_list) bb, (__u32) blk);
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| 156 | }
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| 157 |
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| 158 | /*
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| 159 | * This procedure finds a particular block is on a badblocks
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| 160 | * list.
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| 161 | */
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| 162 | int ext2fs_u32_list_find(ext2_u32_list bb, __u32 blk)
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| 163 | {
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| 164 | int low, high, mid;
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| 165 |
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| 166 | if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
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| 167 | return -1;
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| 168 |
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| 169 | if (bb->num == 0)
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| 170 | return -1;
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| 171 |
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| 172 | low = 0;
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| 173 | high = bb->num-1;
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| 174 | if (blk == bb->list[low])
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| 175 | return low;
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| 176 | if (blk == bb->list[high])
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| 177 | return high;
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| 178 |
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| 179 | while (low < high) {
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| 180 | mid = (low+high)/2;
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| 181 | if (mid == low || mid == high)
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| 182 | break;
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| 183 | if (blk == bb->list[mid])
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| 184 | return mid;
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| 185 | if (blk < bb->list[mid])
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| 186 | high = mid;
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| 187 | else
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| 188 | low = mid;
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| 189 | }
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| 190 | return -1;
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| 191 | }
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| 192 |
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| 193 | /*
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| 194 | * This procedure tests to see if a particular block is on a badblocks
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| 195 | * list.
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| 196 | */
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| 197 | int ext2fs_u32_list_test(ext2_u32_list bb, __u32 blk)
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| 198 | {
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| 199 | if (ext2fs_u32_list_find(bb, blk) < 0)
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| 200 | return 0;
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| 201 | else
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| 202 | return 1;
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| 203 | }
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| 204 |
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| 205 | int ext2fs_badblocks_list_test(ext2_badblocks_list bb, blk_t blk)
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| 206 | {
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| 207 | return ext2fs_u32_list_test((ext2_u32_list) bb, (__u32) blk);
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| 208 | }
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| 209 |
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| 210 |
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| 211 | /*
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| 212 | * Remove a block from the badblock list
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| 213 | */
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| 214 | int ext2fs_u32_list_del(ext2_u32_list bb, __u32 blk)
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| 215 | {
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| 216 | int remloc, i;
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| 217 |
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| 218 | if (bb->num == 0)
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| 219 | return -1;
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| 220 |
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| 221 | remloc = ext2fs_u32_list_find(bb, blk);
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| 222 | if (remloc < 0)
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| 223 | return -1;
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| 224 |
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| 225 | for (i = remloc ; i < bb->num-1; i++)
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| 226 | bb->list[i] = bb->list[i+1];
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| 227 | bb->num--;
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| 228 | return 0;
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| 229 | }
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| 230 |
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| 231 | void ext2fs_badblocks_list_del(ext2_u32_list bb, __u32 blk)
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| 232 | {
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| 233 | ext2fs_u32_list_del(bb, blk);
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| 234 | }
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| 235 |
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| 236 | errcode_t ext2fs_u32_list_iterate_begin(ext2_u32_list bb,
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| 237 | ext2_u32_iterate *ret)
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| 238 | {
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| 239 | ext2_u32_iterate iter;
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| 240 | errcode_t retval;
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| 241 |
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| 242 | EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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| 243 |
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| 244 | retval = ext2fs_get_mem(sizeof(struct ext2_struct_u32_iterate), &iter);
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| 245 | if (retval)
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| 246 | return retval;
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| 247 |
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| 248 | iter->magic = EXT2_ET_MAGIC_BADBLOCKS_ITERATE;
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| 249 | iter->bb = bb;
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| 250 | iter->ptr = 0;
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| 251 | *ret = iter;
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| 252 | return 0;
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| 253 | }
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| 254 |
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| 255 | errcode_t ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
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| 256 | ext2_badblocks_iterate *ret)
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| 257 | {
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| 258 | return ext2fs_u32_list_iterate_begin((ext2_u32_list) bb,
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| 259 | (ext2_u32_iterate *) ret);
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| 260 | }
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| 261 |
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| 262 |
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| 263 | int ext2fs_u32_list_iterate(ext2_u32_iterate iter, __u32 *blk)
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| 264 | {
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| 265 | ext2_u32_list bb;
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| 266 |
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| 267 | if (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE)
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| 268 | return 0;
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| 269 |
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| 270 | bb = iter->bb;
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| 271 |
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| 272 | if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
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| 273 | return 0;
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| 274 |
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| 275 | if (iter->ptr < bb->num) {
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| 276 | *blk = bb->list[iter->ptr++];
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| 277 | return 1;
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| 278 | }
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| 279 | *blk = 0;
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| 280 | return 0;
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| 281 | }
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| 282 |
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| 283 | int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter, blk_t *blk)
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| 284 | {
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| 285 | return ext2fs_u32_list_iterate((ext2_u32_iterate) iter,
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| 286 | (__u32 *) blk);
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| 287 | }
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| 288 |
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| 289 |
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| 290 | void ext2fs_u32_list_iterate_end(ext2_u32_iterate iter)
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| 291 | {
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| 292 | if (!iter || (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE))
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| 293 | return;
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| 294 |
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| 295 | iter->bb = 0;
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| 296 | ext2fs_free_mem(&iter);
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| 297 | }
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| 298 |
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| 299 | void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter)
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| 300 | {
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| 301 | ext2fs_u32_list_iterate_end((ext2_u32_iterate) iter);
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| 302 | }
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| 303 |
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| 304 |
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| 305 | int ext2fs_u32_list_equal(ext2_u32_list bb1, ext2_u32_list bb2)
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| 306 | {
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| 307 | EXT2_CHECK_MAGIC(bb1, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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| 308 | EXT2_CHECK_MAGIC(bb2, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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| 309 |
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| 310 | if (bb1->num != bb2->num)
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| 311 | return 0;
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| 312 |
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| 313 | if (memcmp(bb1->list, bb2->list, bb1->num * sizeof(blk_t)) != 0)
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| 314 | return 0;
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| 315 | return 1;
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| 316 | }
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| 317 |
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| 318 | int ext2fs_badblocks_equal(ext2_badblocks_list bb1, ext2_badblocks_list bb2)
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| 319 | {
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| 320 | return ext2fs_u32_list_equal((ext2_u32_list) bb1,
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| 321 | (ext2_u32_list) bb2);
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| 322 | }
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| 323 |
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| 324 | int ext2fs_u32_list_count(ext2_u32_list bb)
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| 325 | {
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| 326 | return bb->num;
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| 327 | }
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