1 /*
2 * bb_inode.c --- routines to update the bad block inode.
3 *
4 * WARNING: This routine modifies a lot of state in the filesystem; if
5 * this routine returns an error, the bad block inode may be in an
6 * inconsistent state.
7 *
8 * Copyright (C) 1994, 1995 Theodore Ts'o.
9 *
10 * %Begin-Header%
11 * This file may be redistributed under the terms of the GNU Library
12 * General Public License, version 2.
13 * %End-Header%
14 */
15
16 #include <stdio.h>
17 #include <string.h>
18 #if HAVE_UNISTD_H
19 #include <unistd.h>
20 #endif
21 #include <fcntl.h>
22 #include <time.h>
23 #if HAVE_SYS_STAT_H
24 #include <sys/stat.h>
25 #endif
26 #if HAVE_SYS_TYPES_H
27 #include <sys/types.h>
28 #endif
29
30 #include "ext2_fs.h"
31 #include "ext2fs.h"
32
33 struct set_badblock_record {
34 ext2_badblocks_iterate bb_iter;
35 int bad_block_count;
36 blk_t *ind_blocks;
37 int max_ind_blocks;
38 int ind_blocks_size;
39 int ind_blocks_ptr;
40 char *block_buf;
41 errcode_t err;
42 };
43
44 static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
45 e2_blkcnt_t blockcnt,
46 blk_t ref_block, int ref_offset,
47 void *priv_data);
48 static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
49 e2_blkcnt_t blockcnt,
50 blk_t ref_block, int ref_offset,
51 void *priv_data);
52
53 /*
54 * Given a bad blocks bitmap, update the bad blocks inode to reflect
55 * the map.
56 */
ext2fs_update_bb_inode(ext2_filsys fs,ext2_badblocks_list bb_list)57 errcode_t ext2fs_update_bb_inode(ext2_filsys fs, ext2_badblocks_list bb_list)
58 {
59 errcode_t retval;
60 struct set_badblock_record rec;
61 struct ext2_inode inode;
62
63 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
64
65 if (!fs->block_map)
66 return EXT2_ET_NO_BLOCK_BITMAP;
67
68 rec.bad_block_count = 0;
69 rec.ind_blocks_size = rec.ind_blocks_ptr = 0;
70 rec.max_ind_blocks = 10;
71 retval = ext2fs_get_array(rec.max_ind_blocks, sizeof(blk_t),
72 &rec.ind_blocks);
73 if (retval)
74 return retval;
75 memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t));
76 retval = ext2fs_get_mem(fs->blocksize, &rec.block_buf);
77 if (retval)
78 goto cleanup;
79 memset(rec.block_buf, 0, fs->blocksize);
80 rec.err = 0;
81
82 /*
83 * First clear the old bad blocks (while saving the indirect blocks)
84 */
85 retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
86 BLOCK_FLAG_DEPTH_TRAVERSE, 0,
87 clear_bad_block_proc, &rec);
88 if (retval)
89 goto cleanup;
90 if (rec.err) {
91 retval = rec.err;
92 goto cleanup;
93 }
94
95 /*
96 * Now set the bad blocks!
97 *
98 * First, mark the bad blocks as used. This prevents a bad
99 * block from being used as an indirecto block for the bad
100 * block inode (!).
101 */
102 if (bb_list) {
103 retval = ext2fs_badblocks_list_iterate_begin(bb_list,
104 &rec.bb_iter);
105 if (retval)
106 goto cleanup;
107 retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
108 BLOCK_FLAG_APPEND, 0,
109 set_bad_block_proc, &rec);
110 ext2fs_badblocks_list_iterate_end(rec.bb_iter);
111 if (retval)
112 goto cleanup;
113 if (rec.err) {
114 retval = rec.err;
115 goto cleanup;
116 }
117 }
118
119 /*
120 * Update the bad block inode's mod time and block count
121 * field.
122 */
123 retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
124 if (retval)
125 goto cleanup;
126
127 inode.i_atime = inode.i_mtime = fs->now ? fs->now : time(0);
128 if (!inode.i_ctime)
129 inode.i_ctime = fs->now ? fs->now : time(0);
130 ext2fs_iblk_set(fs, &inode, rec.bad_block_count);
131 inode.i_size = rec.bad_block_count * fs->blocksize;
132
133 retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
134 if (retval)
135 goto cleanup;
136
137 cleanup:
138 ext2fs_free_mem(&rec.ind_blocks);
139 ext2fs_free_mem(&rec.block_buf);
140 return retval;
141 }
142
143 /*
144 * Helper function for update_bb_inode()
145 *
146 * Clear the bad blocks in the bad block inode, while saving the
147 * indirect blocks.
148 */
149 #ifdef __TURBOC__
150 #pragma argsused
151 #endif
clear_bad_block_proc(ext2_filsys fs,blk_t * block_nr,e2_blkcnt_t blockcnt,blk_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * priv_data)152 static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
153 e2_blkcnt_t blockcnt,
154 blk_t ref_block EXT2FS_ATTR((unused)),
155 int ref_offset EXT2FS_ATTR((unused)),
156 void *priv_data)
157 {
158 struct set_badblock_record *rec = (struct set_badblock_record *)
159 priv_data;
160 errcode_t retval;
161 unsigned long old_size;
162
163 if (!*block_nr)
164 return 0;
165
166 /*
167 * If the block number is outrageous, clear it and ignore it.
168 */
169 if (*block_nr >= fs->super->s_blocks_count ||
170 *block_nr < fs->super->s_first_data_block) {
171 *block_nr = 0;
172 return BLOCK_CHANGED;
173 }
174
175 if (blockcnt < 0) {
176 if (rec->ind_blocks_size >= rec->max_ind_blocks) {
177 old_size = rec->max_ind_blocks * sizeof(blk_t);
178 rec->max_ind_blocks += 10;
179 retval = ext2fs_resize_mem(old_size,
180 rec->max_ind_blocks * sizeof(blk_t),
181 &rec->ind_blocks);
182 if (retval) {
183 rec->max_ind_blocks -= 10;
184 rec->err = retval;
185 return BLOCK_ABORT;
186 }
187 }
188 rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
189 }
190
191 /*
192 * Mark the block as unused, and update accounting information
193 */
194 ext2fs_block_alloc_stats(fs, *block_nr, -1);
195
196 *block_nr = 0;
197 return BLOCK_CHANGED;
198 }
199
200
201 /*
202 * Helper function for update_bb_inode()
203 *
204 * Set the block list in the bad block inode, using the supplied bitmap.
205 */
206 #ifdef __TURBOC__
207 #pragma argsused
208 #endif
set_bad_block_proc(ext2_filsys fs,blk_t * block_nr,e2_blkcnt_t blockcnt,blk_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * priv_data)209 static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
210 e2_blkcnt_t blockcnt,
211 blk_t ref_block EXT2FS_ATTR((unused)),
212 int ref_offset EXT2FS_ATTR((unused)),
213 void *priv_data)
214 {
215 struct set_badblock_record *rec = (struct set_badblock_record *)
216 priv_data;
217 errcode_t retval;
218 blk_t blk;
219
220 if (blockcnt >= 0) {
221 /*
222 * Get the next bad block.
223 */
224 if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk))
225 return BLOCK_ABORT;
226 rec->bad_block_count++;
227 } else {
228 /*
229 * An indirect block; fetch a block from the
230 * previously used indirect block list. The block
231 * most be not marked as used; if so, get another one.
232 * If we run out of reserved indirect blocks, allocate
233 * a new one.
234 */
235 retry:
236 if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
237 blk = rec->ind_blocks[rec->ind_blocks_ptr++];
238 if (ext2fs_test_block_bitmap(fs->block_map, blk))
239 goto retry;
240 } else {
241 retval = ext2fs_new_block(fs, 0, 0, &blk);
242 if (retval) {
243 rec->err = retval;
244 return BLOCK_ABORT;
245 }
246 }
247 retval = io_channel_write_blk(fs->io, blk, 1, rec->block_buf);
248 if (retval) {
249 rec->err = retval;
250 return BLOCK_ABORT;
251 }
252 }
253
254 /*
255 * Update block counts
256 */
257 ext2fs_block_alloc_stats(fs, blk, +1);
258
259 *block_nr = blk;
260 return BLOCK_CHANGED;
261 }
262
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