summaryrefslogtreecommitdiff
path: root/e2fslib/bb_inode.c
blob: 34c49552f19fd867bebd8bd09bca2bc586dd1700 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
/*
 * bb_inode.c --- routines to update the bad block inode.
 * 
 * WARNING: This routine modifies a lot of state in the filesystem; if
 * this routine returns an error, the bad block inode may be in an
 * inconsistent state.
 * 
 * Copyright (C) 1994, 1995 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 "ext2_fs.h"
#include "ext2fs.h"

struct set_badblock_record {
	ext2_badblocks_iterate	bb_iter;
	int		bad_block_count;
	blk_t		*ind_blocks;
	int		max_ind_blocks;
	int		ind_blocks_size;
	int		ind_blocks_ptr;
	char		*block_buf;
	errcode_t	err;
};

static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
			      e2_blkcnt_t blockcnt,
			      blk_t ref_block, int ref_offset,
			      void *priv_data);
static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
				e2_blkcnt_t blockcnt,
				blk_t ref_block, int ref_offset,
				void *priv_data);
	
/*
 * Given a bad blocks bitmap, update the bad blocks inode to reflect
 * the map.
 */
errcode_t ext2fs_update_bb_inode(ext2_filsys fs, ext2_badblocks_list bb_list)
{
	errcode_t			retval;
	struct set_badblock_record 	rec;
	struct ext2_inode		inode;
	blk_t				blk;
	
	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	if (!fs->block_map)
		return EXT2_ET_NO_BLOCK_BITMAP;
	
	rec.bad_block_count = 0;
	rec.ind_blocks_size = rec.ind_blocks_ptr = 0;
	rec.max_ind_blocks = 10;
	retval = ext2fs_get_mem(rec.max_ind_blocks * sizeof(blk_t),
				(void **) &rec.ind_blocks);
	if (retval)
		return retval;
	memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t));
	retval = ext2fs_get_mem(fs->blocksize, (void **) &rec.block_buf);
	if (retval)
		goto cleanup;
	memset(rec.block_buf, 0, fs->blocksize);
	rec.err = 0;
	
	/*
	 * First clear the old bad blocks (while saving the indirect blocks) 
	 */
	retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
				       BLOCK_FLAG_DEPTH_TRAVERSE, 0,
				       clear_bad_block_proc, &rec);
	if (retval)
		goto cleanup;
	if (rec.err) {
		retval = rec.err;
		goto cleanup;
	}
	
	/*
	 * Now set the bad blocks!
	 *
	 * First, mark the bad blocks as used.  This prevents a bad
	 * block from being used as an indirecto block for the bad
	 * block inode (!).
	 */
	if (bb_list) {
		retval = ext2fs_badblocks_list_iterate_begin(bb_list,
							     &rec.bb_iter);
		if (retval)
			goto cleanup;
		while (ext2fs_badblocks_list_iterate(rec.bb_iter, &blk)) {
			ext2fs_mark_block_bitmap(fs->block_map, blk); 
		}
		ext2fs_badblocks_list_iterate_end(rec.bb_iter);
		ext2fs_mark_bb_dirty(fs);
		
		retval = ext2fs_badblocks_list_iterate_begin(bb_list,
							     &rec.bb_iter);
		if (retval)
			goto cleanup;
		retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
					       BLOCK_FLAG_APPEND, 0,
					       set_bad_block_proc, &rec);
		ext2fs_badblocks_list_iterate_end(rec.bb_iter);
		if (retval) 
			goto cleanup;
		if (rec.err) {
			retval = rec.err;
			goto cleanup;
		}
	}
	
	/*
	 * Update the bad block inode's mod time and block count
	 * field.  
	 */
	retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
	if (retval)
		goto cleanup;
	
	inode.i_atime = inode.i_mtime = time(0);
	if (!inode.i_ctime)
		inode.i_ctime = time(0);
	inode.i_blocks = rec.bad_block_count * (fs->blocksize / 512);
	inode.i_size = rec.bad_block_count * fs->blocksize;

	retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
	if (retval)
		goto cleanup;
	
cleanup:
	ext2fs_free_mem((void **) &rec.ind_blocks);
	ext2fs_free_mem((void **) &rec.block_buf);
	return retval;
}

/*
 * Helper function for update_bb_inode()
 *
 * Clear the bad blocks in the bad block inode, while saving the
 * indirect blocks.
 */
#ifdef __TURBOC__
 #pragma argsused
#endif
static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
				e2_blkcnt_t blockcnt,
				blk_t ref_block, int ref_offset,
				void *priv_data)
{
	struct set_badblock_record *rec = (struct set_badblock_record *)
		priv_data;
	errcode_t	retval;
	int		group;
	unsigned long 	old_size;

	if (!*block_nr)
		return 0;

	/*
	 * If the block number is outrageous, clear it and ignore it.
	 */
	if (*block_nr >= fs->super->s_blocks_count ||
	    *block_nr < fs->super->s_first_data_block) {
		*block_nr = 0;
		return BLOCK_CHANGED;
	}

	if (blockcnt < 0) {
		if (rec->ind_blocks_size >= rec->max_ind_blocks) {
			old_size = rec->max_ind_blocks * sizeof(blk_t);
			rec->max_ind_blocks += 10;
			retval = ext2fs_resize_mem(old_size, 
				   rec->max_ind_blocks * sizeof(blk_t),
				   (void **) &rec->ind_blocks);
			if (retval) {
				rec->max_ind_blocks -= 10;
				rec->err = retval;
				return BLOCK_ABORT;
			}
		}
		rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
	}

	/*
	 * Mark the block as unused, and update accounting information
	 */
	ext2fs_unmark_block_bitmap(fs->block_map, *block_nr);
	ext2fs_mark_bb_dirty(fs);
	group = ext2fs_group_of_blk(fs, *block_nr);
	fs->group_desc[group].bg_free_blocks_count++;
	fs->super->s_free_blocks_count++;
	ext2fs_mark_super_dirty(fs);
	
	*block_nr = 0;
	return BLOCK_CHANGED;
}

	
/*
 * Helper function for update_bb_inode()
 *
 * Set the block list in the bad block inode, using the supplied bitmap.
 */
#ifdef __TURBOC__
 #pragma argsused
#endif
static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
			      e2_blkcnt_t blockcnt, blk_t ref_block, 
			      int ref_offset, void *priv_data)
{
	struct set_badblock_record *rec = (struct set_badblock_record *)
		priv_data;
	errcode_t	retval;
	blk_t		blk;
	int		group;

	if (blockcnt >= 0) {
		/*
		 * Get the next bad block.
		 */
		if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk))
			return BLOCK_ABORT;
		rec->bad_block_count++;
	} else {
		/*
		 * An indirect block; fetch a block from the
		 * previously used indirect block list.  The block
		 * most be not marked as used; if so, get another one.
		 * If we run out of reserved indirect blocks, allocate
		 * a new one.
		 */
	retry:
		if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
			blk = rec->ind_blocks[rec->ind_blocks_ptr++];
			if (ext2fs_test_block_bitmap(fs->block_map, blk))
				goto retry;
		} else {
			retval = ext2fs_new_block(fs, 0, 0, &blk);
			if (retval) {
				rec->err = retval;
				return BLOCK_ABORT;
			}
		}
		retval = io_channel_write_blk(fs->io, blk, 1, rec->block_buf);
		if (retval) {
			rec->err = retval;
			return BLOCK_ABORT;
		}
		ext2fs_mark_block_bitmap(fs->block_map, blk); 
		ext2fs_mark_bb_dirty(fs);
	}
	
	/*
	 * Update block counts
	 */
	group = ext2fs_group_of_blk(fs, blk);
	fs->group_desc[group].bg_free_blocks_count--;
	fs->super->s_free_blocks_count--;
	ext2fs_mark_super_dirty(fs);
	
	*block_nr = blk;
	return BLOCK_CHANGED;
}