From d1e063beb43e595680c65e3804d1f8ddff53373b Mon Sep 17 00:00:00 2001 From: Guido Guenther Date: Sat, 18 Nov 2006 23:48:07 +0100 Subject: Imported Debian version 0.3.8.8 --- e2fslib/badblocks.c | 236 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 236 insertions(+) create mode 100644 e2fslib/badblocks.c (limited to 'e2fslib/badblocks.c') diff --git a/e2fslib/badblocks.c b/e2fslib/badblocks.c new file mode 100644 index 0000000..4e94e8c --- /dev/null +++ b/e2fslib/badblocks.c @@ -0,0 +1,236 @@ +/* + * 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 +#include +#if HAVE_UNISTD_H +#include +#endif +#include +#include +#if HAVE_SYS_STAT_H +#include +#endif +#if HAVE_SYS_TYPES_H +#include +#endif + +#include "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; + unsigned long old_size; + + EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST); + + if (bb->num >= bb->size) { + old_size = bb->size * sizeof(blk_t); + bb->size += 100; + retval = ext2fs_resize_mem(old_size, bb->size * sizeof(blk_t), + (void **) &bb->list); + if (retval) { + bb->size -= 100; + return retval; + } + } + + /* + * Add special case code for appending to the end of the list + */ + i = bb->num-1; + if ((bb->num != 0) && (bb->list[i] == blk)) + return 0; + if ((bb->num == 0) || (bb->list[i] < blk)) { + bb->list[bb->num++] = blk; + return 0; + } + + 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); +} + +int ext2fs_badblocks_equal(ext2_badblocks_list bb1, ext2_badblocks_list bb2) +{ + EXT2_CHECK_MAGIC(bb1, EXT2_ET_MAGIC_BADBLOCKS_LIST); + EXT2_CHECK_MAGIC(bb2, EXT2_ET_MAGIC_BADBLOCKS_LIST); + + if (bb1->num != bb2->num) + return 0; + + if (memcmp(bb1->list, bb2->list, bb1->num * sizeof(blk_t)) != 0) + return 0; + return 1; +} -- cgit v1.2.3