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329 lines
6.4 KiB
C
329 lines
6.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* badblocks.c --- routines to manipulate the bad block structure
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*
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* Copyright (C) 1994, 1995, 1996 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <time.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fsP.h"
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/*
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* Helper function for making a badblocks list
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*/
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static errcode_t make_u32_list(int size, int num, __u32 *list,
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ext2_u32_list *ret)
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{
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ext2_u32_list bb;
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errcode_t retval;
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retval = ext2fs_get_mem(sizeof(struct ext2_struct_u32_list), &bb);
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if (retval)
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return retval;
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memset(bb, 0, sizeof(struct ext2_struct_u32_list));
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bb->magic = EXT2_ET_MAGIC_BADBLOCKS_LIST;
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bb->size = size ? size : 10;
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bb->num = num;
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retval = ext2fs_get_mem(bb->size * sizeof(blk_t), &bb->list);
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if (!bb->list) {
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ext2fs_free_mem(&bb);
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return retval;
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}
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if (list)
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memcpy(bb->list, list, bb->size * sizeof(blk_t));
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else
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memset(bb->list, 0, bb->size * sizeof(blk_t));
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*ret = bb;
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return 0;
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}
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/*
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* This procedure creates an empty u32 list.
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*/
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errcode_t ext2fs_u32_list_create(ext2_u32_list *ret, int size)
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{
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return make_u32_list(size, 0, 0, ret);
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}
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/*
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* This procedure creates an empty badblocks list.
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*/
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errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret, int size)
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{
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return make_u32_list(size, 0, 0, (ext2_badblocks_list *) ret);
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}
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/*
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* This procedure copies a badblocks list
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*/
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errcode_t ext2fs_u32_copy(ext2_u32_list src, ext2_u32_list *dest)
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{
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errcode_t retval;
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retval = make_u32_list(src->size, src->num, src->list, dest);
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if (retval)
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return retval;
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(*dest)->badblocks_flags = src->badblocks_flags;
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return 0;
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}
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errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
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ext2_badblocks_list *dest)
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{
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return ext2fs_u32_copy((ext2_u32_list) src,
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(ext2_u32_list *) dest);
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}
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/*
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* This procedure frees a badblocks list.
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*
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* (note: moved to closefs.c)
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*/
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/*
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* This procedure adds a block to a badblocks list.
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*/
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errcode_t ext2fs_u32_list_add(ext2_u32_list bb, __u32 blk)
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{
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errcode_t retval;
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int i, j;
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unsigned long old_size;
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EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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if (bb->num >= bb->size) {
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old_size = bb->size * sizeof(__u32);
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bb->size += 100;
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retval = ext2fs_resize_mem(old_size, bb->size * sizeof(__u32),
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&bb->list);
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if (retval) {
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bb->size -= 100;
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return retval;
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}
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}
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/*
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* Add special case code for appending to the end of the list
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*/
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i = bb->num-1;
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if ((bb->num != 0) && (bb->list[i] == blk))
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return 0;
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if ((bb->num == 0) || (bb->list[i] < blk)) {
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bb->list[bb->num++] = blk;
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return 0;
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}
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j = bb->num;
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for (i=0; i < bb->num; i++) {
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if (bb->list[i] == blk)
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return 0;
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if (bb->list[i] > blk) {
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j = i;
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break;
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}
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}
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for (i=bb->num; i > j; i--)
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bb->list[i] = bb->list[i-1];
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bb->list[j] = blk;
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bb->num++;
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return 0;
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}
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errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb, blk_t blk)
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{
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return ext2fs_u32_list_add((ext2_u32_list) bb, (__u32) blk);
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}
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/*
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* This procedure finds a particular block is on a badblocks
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* list.
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*/
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int ext2fs_u32_list_find(ext2_u32_list bb, __u32 blk)
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{
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int low, high, mid;
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if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
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return -1;
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if (bb->num == 0)
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return -1;
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low = 0;
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high = bb->num-1;
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if (blk == bb->list[low])
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return low;
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if (blk == bb->list[high])
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return high;
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while (low < high) {
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mid = (low+high)/2;
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if (mid == low || mid == high)
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break;
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if (blk == bb->list[mid])
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return mid;
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if (blk < bb->list[mid])
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high = mid;
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else
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low = mid;
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}
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return -1;
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}
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/*
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* This procedure tests to see if a particular block is on a badblocks
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* list.
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*/
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int ext2fs_u32_list_test(ext2_u32_list bb, __u32 blk)
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{
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if (ext2fs_u32_list_find(bb, blk) < 0)
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return 0;
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else
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return 1;
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}
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int ext2fs_badblocks_list_test(ext2_badblocks_list bb, blk_t blk)
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{
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return ext2fs_u32_list_test((ext2_u32_list) bb, (__u32) blk);
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}
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/*
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* Remove a block from the badblock list
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*/
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int ext2fs_u32_list_del(ext2_u32_list bb, __u32 blk)
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{
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int remloc, i;
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if (bb->num == 0)
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return -1;
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remloc = ext2fs_u32_list_find(bb, blk);
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if (remloc < 0)
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return -1;
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for (i = remloc; i < bb->num - 1; i++)
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bb->list[i] = bb->list[i+1];
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bb->num--;
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return 0;
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}
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void ext2fs_badblocks_list_del(ext2_u32_list bb, __u32 blk)
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{
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ext2fs_u32_list_del(bb, blk);
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}
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errcode_t ext2fs_u32_list_iterate_begin(ext2_u32_list bb,
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ext2_u32_iterate *ret)
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{
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ext2_u32_iterate iter;
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errcode_t retval;
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EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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retval = ext2fs_get_mem(sizeof(struct ext2_struct_u32_iterate), &iter);
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if (retval)
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return retval;
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iter->magic = EXT2_ET_MAGIC_BADBLOCKS_ITERATE;
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iter->bb = bb;
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iter->ptr = 0;
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*ret = iter;
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return 0;
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}
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errcode_t ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
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ext2_badblocks_iterate *ret)
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{
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return ext2fs_u32_list_iterate_begin((ext2_u32_list) bb,
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(ext2_u32_iterate *) ret);
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}
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int ext2fs_u32_list_iterate(ext2_u32_iterate iter, __u32 *blk)
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{
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ext2_u32_list bb;
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if (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE)
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return 0;
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bb = iter->bb;
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if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
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return 0;
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if (iter->ptr < bb->num) {
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*blk = bb->list[iter->ptr++];
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return 1;
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}
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*blk = 0;
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return 0;
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}
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int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter, blk_t *blk)
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{
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return ext2fs_u32_list_iterate((ext2_u32_iterate) iter,
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(__u32 *) blk);
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}
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void ext2fs_u32_list_iterate_end(ext2_u32_iterate iter)
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{
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if (!iter || (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE))
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return;
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iter->bb = 0;
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ext2fs_free_mem(&iter);
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}
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void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter)
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{
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ext2fs_u32_list_iterate_end((ext2_u32_iterate) iter);
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}
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int ext2fs_u32_list_equal(ext2_u32_list bb1, ext2_u32_list bb2)
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{
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EXT2_CHECK_MAGIC(bb1, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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EXT2_CHECK_MAGIC(bb2, EXT2_ET_MAGIC_BADBLOCKS_LIST);
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if (bb1->num != bb2->num)
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return 0;
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if (memcmp(bb1->list, bb2->list, bb1->num * sizeof(blk_t)) != 0)
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return 0;
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return 1;
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}
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int ext2fs_badblocks_equal(ext2_badblocks_list bb1, ext2_badblocks_list bb2)
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{
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return ext2fs_u32_list_equal((ext2_u32_list) bb1,
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(ext2_u32_list) bb2);
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}
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int ext2fs_u32_list_count(ext2_u32_list bb)
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{
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return bb->num;
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}
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