badblocks.c revision 4cbe8af4b0d0c72fb28bb500c1bd8a46b00fdde3 
1/*
2 * badblocks.c --- routines to manipulate the bad block structure
3 *
4 * Copyright (C) 1994, 1995, 1996 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <string.h>
14#if HAVE_UNISTD_H
15#include <unistd.h>
16#endif
17#include <stdlib.h>
18#include <fcntl.h>
19#include <time.h>
20#include <sys/stat.h>
21#include <sys/types.h>
22#if HAVE_ERRNO_H
23#include <errno.h>
24#endif
25
26#include <linux/ext2_fs.h>
27
28#include "ext2fsP.h"
29
30/*
31 * Helper function for making a badblocks list
32 */
33static errcode_t make_badblocks_list(int size, int num, blk_t *list,
34				     ext2_badblocks_list *ret)
35{
36	ext2_badblocks_list	bb;
37
38	bb = malloc(sizeof(struct ext2_struct_badblocks_list));
39	if (!bb)
40		return ENOMEM;
41	memset(bb, 0, sizeof(struct ext2_struct_badblocks_list));
42	bb->magic = EXT2_ET_MAGIC_BADBLOCKS_LIST;
43	bb->size = size ? size : 10;
44	bb->num = num;
45	bb->list = malloc(bb->size * sizeof(blk_t));
46	if (!bb->list) {
47		free(bb);
48		return ENOMEM;
49	}
50	if (list)
51		memcpy(bb->list, list, bb->size * sizeof(blk_t));
52	else
53		memset(bb->list, 0, bb->size * sizeof(blk_t));
54	*ret = bb;
55	return 0;
56}
57
58
59/*
60 * This procedure creates an empty badblocks list.
61 */
62errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret, int size)
63{
64	return make_badblocks_list(size, 0, 0, ret);
65}
66
67/*
68 * This procedure copies a badblocks list
69 */
70errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
71				ext2_badblocks_list *dest)
72{
73	errcode_t	retval;
74
75	retval = make_badblocks_list(src->size, src->num, src->list,
76				     dest);
77	if (retval)
78		return retval;
79	(*dest)->badblocks_flags = src->badblocks_flags;
80	return 0;
81}
82
83
84/*
85 * This procedure frees a badblocks list.
86 *
87 * (note: moved to closefs.c)
88 */
89
90
91/*
92 * This procedure adds a block to a badblocks list.
93 */
94errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb, blk_t blk)
95{
96	int	i, j;
97	blk_t	*new_list;
98
99	EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
100
101	if (bb->num >= bb->size) {
102		bb->size += 10;
103		new_list = realloc(bb->list, bb->size * sizeof(blk_t));
104		if (!new_list)
105			return ENOMEM;
106		bb->list = new_list;
107	}
108
109	j = bb->num;
110	for (i=0; i < bb->num; i++) {
111		if (bb->list[i] == blk)
112			return 0;
113		if (bb->list[i] > blk) {
114			j = i;
115			break;
116		}
117	}
118	for (i=bb->num; i > j; i--)
119		bb->list[i] = bb->list[i-1];
120	bb->list[j] = blk;
121	bb->num++;
122	return 0;
123}
124
125/*
126 * This procedure tests to see if a particular block is on a badblocks
127 * list.
128 */
129int ext2fs_badblocks_list_test(ext2_badblocks_list bb, blk_t blk)
130{
131	int	low, high, mid;
132
133	if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
134		return 0;
135
136	if (bb->num == 0)
137		return 0;
138
139	low = 0;
140	high = bb->num-1;
141	if (blk == bb->list[low])
142		return 1;
143	if (blk == bb->list[high])
144		return 1;
145
146	while (low < high) {
147		mid = (low+high)/2;
148		if (mid == low || mid == high)
149			break;
150		if (blk == bb->list[mid])
151			return 1;
152		if (blk < bb->list[mid])
153			high = mid;
154		else
155			low = mid;
156	}
157	return 0;
158}
159
160errcode_t ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
161					      ext2_badblocks_iterate *ret)
162{
163	ext2_badblocks_iterate iter;
164
165	EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
166
167	iter = malloc(sizeof(struct ext2_struct_badblocks_iterate));
168	if (!iter)
169		return ENOMEM;
170
171	iter->magic = EXT2_ET_MAGIC_BADBLOCKS_ITERATE;
172	iter->bb = bb;
173	iter->ptr = 0;
174	*ret = iter;
175	return 0;
176}
177
178int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter, blk_t *blk)
179{
180	ext2_badblocks_list	bb;
181
182	if (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE)
183		return 0;
184
185	bb = iter->bb;
186
187	if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
188		return 0;
189
190	if (iter->ptr < bb->num) {
191		*blk = bb->list[iter->ptr++];
192		return 1;
193	}
194	*blk = 0;
195	return 0;
196}
197
198void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter)
199{
200	if (!iter || (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE))
201		return;
202
203	iter->bb = 0;
204	free(iter);
205}
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