badblocks.c revision 5be8dc2143c7b3b21a9b8fb56797dd855ee87560 
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 <fcntl.h>
18#include <time.h>
19#if HAVE_SYS_STAT_H
20#include <sys/stat.h>
21#endif
22#if HAVE_SYS_TYPES_H
23#include <sys/types.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	errcode_t		retval;
38
39	retval = ext2fs_get_mem(sizeof(struct ext2_struct_badblocks_list),
40				(void **) &bb);
41	if (retval)
42		return retval;
43	memset(bb, 0, sizeof(struct ext2_struct_badblocks_list));
44	bb->magic = EXT2_ET_MAGIC_BADBLOCKS_LIST;
45	bb->size = size ? size : 10;
46	bb->num = num;
47	retval = ext2fs_get_mem(bb->size * sizeof(blk_t), (void **) &bb->list);
48	if (!bb->list) {
49		ext2fs_free_mem((void **) &bb);
50		return retval;
51	}
52	if (list)
53		memcpy(bb->list, list, bb->size * sizeof(blk_t));
54	else
55		memset(bb->list, 0, bb->size * sizeof(blk_t));
56	*ret = bb;
57	return 0;
58}
59
60
61/*
62 * This procedure creates an empty badblocks list.
63 */
64errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret, int size)
65{
66	return make_badblocks_list(size, 0, 0, ret);
67}
68
69/*
70 * This procedure copies a badblocks list
71 */
72errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
73				ext2_badblocks_list *dest)
74{
75	errcode_t	retval;
76
77	retval = make_badblocks_list(src->size, src->num, src->list,
78				     dest);
79	if (retval)
80		return retval;
81	(*dest)->badblocks_flags = src->badblocks_flags;
82	return 0;
83}
84
85
86/*
87 * This procedure frees a badblocks list.
88 *
89 * (note: moved to closefs.c)
90 */
91
92
93/*
94 * This procedure adds a block to a badblocks list.
95 */
96errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb, blk_t blk)
97{
98	errcode_t	retval;
99	int		i, j;
100
101	EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
102
103	if (bb->num >= bb->size) {
104		bb->size += 10;
105		retval = ext2fs_resize_mem(bb->size * sizeof(blk_t),
106					   (void **) &bb->list);
107		if (retval)
108			return retval;
109	}
110
111	j = bb->num;
112	for (i=0; i < bb->num; i++) {
113		if (bb->list[i] == blk)
114			return 0;
115		if (bb->list[i] > blk) {
116			j = i;
117			break;
118		}
119	}
120	for (i=bb->num; i > j; i--)
121		bb->list[i] = bb->list[i-1];
122	bb->list[j] = blk;
123	bb->num++;
124	return 0;
125}
126
127/*
128 * This procedure tests to see if a particular block is on a badblocks
129 * list.
130 */
131int ext2fs_badblocks_list_test(ext2_badblocks_list bb, blk_t blk)
132{
133	int	low, high, mid;
134
135	if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
136		return 0;
137
138	if (bb->num == 0)
139		return 0;
140
141	low = 0;
142	high = bb->num-1;
143	if (blk == bb->list[low])
144		return 1;
145	if (blk == bb->list[high])
146		return 1;
147
148	while (low < high) {
149		mid = (low+high)/2;
150		if (mid == low || mid == high)
151			break;
152		if (blk == bb->list[mid])
153			return 1;
154		if (blk < bb->list[mid])
155			high = mid;
156		else
157			low = mid;
158	}
159	return 0;
160}
161
162errcode_t ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
163					      ext2_badblocks_iterate *ret)
164{
165	ext2_badblocks_iterate iter;
166	errcode_t		retval;
167
168	EXT2_CHECK_MAGIC(bb, EXT2_ET_MAGIC_BADBLOCKS_LIST);
169
170	retval = ext2fs_get_mem(sizeof(struct ext2_struct_badblocks_iterate),
171			      (void **) &iter);
172	if (retval)
173		return retval;
174
175	iter->magic = EXT2_ET_MAGIC_BADBLOCKS_ITERATE;
176	iter->bb = bb;
177	iter->ptr = 0;
178	*ret = iter;
179	return 0;
180}
181
182int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter, blk_t *blk)
183{
184	ext2_badblocks_list	bb;
185
186	if (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE)
187		return 0;
188
189	bb = iter->bb;
190
191	if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
192		return 0;
193
194	if (iter->ptr < bb->num) {
195		*blk = bb->list[iter->ptr++];
196		return 1;
197	}
198	*blk = 0;
199	return 0;
200}
201
202void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter)
203{
204	if (!iter || (iter->magic != EXT2_ET_MAGIC_BADBLOCKS_ITERATE))
205		return;
206
207	iter->bb = 0;
208	ext2fs_free_mem((void **) &iter);
209}
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