| /* |
| * badblocks.c --- routines to manipulate the bad block structure |
| * |
| * Copyright (C) 1994, 1995, 1996 Theodore Ts'o. |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Public |
| * License. |
| * %End-Header% |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #include <fcntl.h> |
| #include <time.h> |
| #if HAVE_SYS_STAT_H |
| #include <sys/stat.h> |
| #endif |
| #if HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| |
| #include <linux/ext2_fs.h> |
| |
| #include "ext2fsP.h" |
| |
| /* |
| * Helper function for making a badblocks list |
| */ |
| static errcode_t make_badblocks_list(int size, int num, blk_t *list, |
| ext2_badblocks_list *ret) |
| { |
| ext2_badblocks_list bb; |
| errcode_t retval; |
| |
| retval = ext2fs_get_mem(sizeof(struct ext2_struct_badblocks_list), |
| (void **) &bb); |
| if (retval) |
| return retval; |
| memset(bb, 0, sizeof(struct ext2_struct_badblocks_list)); |
| bb->magic = EXT2_ET_MAGIC_BADBLOCKS_LIST; |
| bb->size = size ? size : 10; |
| bb->num = num; |
| retval = ext2fs_get_mem(bb->size * sizeof(blk_t), (void **) &bb->list); |
| if (!bb->list) { |
| ext2fs_free_mem((void **) &bb); |
| return retval; |
| } |
| if (list) |
| memcpy(bb->list, list, bb->size * sizeof(blk_t)); |
| else |
| memset(bb->list, 0, bb->size * sizeof(blk_t)); |
| *ret = bb; |
| return 0; |
| } |
| |
| |
| /* |
| * This procedure creates an empty badblocks list. |
| */ |
| errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret, int size) |
| { |
| return make_badblocks_list(size, 0, 0, ret); |
| } |
| |
| /* |
| * This procedure copies a badblocks list |
| */ |
| errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src, |
| ext2_badblocks_list *dest) |
| { |
| errcode_t retval; |
| |
| retval = make_badblocks_list(src->size, src->num, src->list, |
| dest); |
| if (retval) |
| return retval; |
| (*dest)->badblocks_flags = src->badblocks_flags; |
| return 0; |
| } |
| |
| |
| /* |
| * This procedure frees a badblocks list. |
| * |
| * (note: moved to closefs.c) |
| */ |
| |
| |
| /* |
| * This procedure adds a block to a badblocks list. |
| */ |
| errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb, blk_t blk) |
| { |
| errcode_t retval; |
| int i, j; |
| |
| EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST); |
| |
| if (bb->num >= bb->size) { |
| bb->size += 10; |
| retval = ext2fs_resize_mem(bb->size * sizeof(blk_t), |
| (void **) &bb->list); |
| if (retval) |
| return retval; |
| } |
| |
| j = bb->num; |
| for (i=0; i < bb->num; i++) { |
| if (bb->list[i] == blk) |
| return 0; |
| if (bb->list[i] > blk) { |
| j = i; |
| break; |
| } |
| } |
| for (i=bb->num; i > j; i--) |
| bb->list[i] = bb->list[i-1]; |
| bb->list[j] = blk; |
| bb->num++; |
| return 0; |
| } |
| |
| /* |
| * This procedure tests to see if a particular block is on a badblocks |
| * list. |
| */ |
| int ext2fs_badblocks_list_test(ext2_badblocks_list bb, blk_t blk) |
| { |
| int low, high, mid; |
| |
| if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST) |
| return 0; |
| |
| if (bb->num == 0) |
| return 0; |
| |
| low = 0; |
| high = bb->num-1; |
| if (blk == bb->list[low]) |
| return 1; |
| if (blk == bb->list[high]) |
| return 1; |
| |
| while (low < high) { |
| mid = (low+high)/2; |
| if (mid == low || mid == high) |
| break; |
| if (blk == bb->list[mid]) |
| return 1; |
| if (blk < bb->list[mid]) |
| high = mid; |
| else |
| low = mid; |
| } |
| return 0; |
| } |
| |
| errcode_t ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb, |
| ext2_badblocks_iterate *ret) |
| { |
| ext2_badblocks_iterate iter; |
| errcode_t retval; |
| |
| EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST); |
| |
| retval = ext2fs_get_mem(sizeof(struct ext2_struct_badblocks_iterate), |
| (void **) &iter); |
| if (retval) |
| return retval; |
| |
| iter->magic = EXT2_ET_MAGIC_BADBLOCKS_ITERATE; |
| iter->bb = bb; |
| iter->ptr = 0; |
| *ret = iter; |
| return 0; |
| } |
| |
| int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter, blk_t *blk) |
| { |
| ext2_badblocks_list bb; |
| |
| if (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE) |
| return 0; |
| |
| bb = iter->bb; |
| |
| if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST) |
| return 0; |
| |
| if (iter->ptr < bb->num) { |
| *blk = bb->list[iter->ptr++]; |
| return 1; |
| } |
| *blk = 0; |
| return 0; |
| } |
| |
| void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter) |
| { |
| if (!iter || (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE)) |
| return; |
| |
| iter->bb = 0; |
| ext2fs_free_mem((void **) &iter); |
| } |
| |
| |
| |
| |
| |