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 "config.h"
17 #include <stdio.h>
18 #include <string.h>
19 #if HAVE_UNISTD_H
20 #include <unistd.h>
21 #endif
22 #include <fcntl.h>
23 #include <time.h>
24 #if HAVE_SYS_STAT_H
25 #include <sys/stat.h>
26 #endif
27 #if HAVE_SYS_TYPES_H
28 #include <sys/types.h>
29 #endif
30
31 #include "ext2_fs.h"
32 #include "ext2fs.h"
33
34 struct set_badblock_record {
35 ext2_badblocks_iterate bb_iter;
36 int bad_block_count;
37 blk_t *ind_blocks;
38 int max_ind_blocks;
39 int ind_blocks_size;
40 int ind_blocks_ptr;
41 char *block_buf;
42 errcode_t err;
43 };
44
45 static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
46 e2_blkcnt_t blockcnt,
47 blk_t ref_block, int ref_offset,
48 void *priv_data);
49 static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
50 e2_blkcnt_t blockcnt,
51 blk_t ref_block, int ref_offset,
52 void *priv_data);
53
54 /*
55 * Given a bad blocks bitmap, update the bad blocks inode to reflect
56 * the map.
57 */
ext2fs_update_bb_inode(ext2_filsys fs,ext2_badblocks_list bb_list)58 errcode_t ext2fs_update_bb_inode(ext2_filsys fs, ext2_badblocks_list bb_list)
59 {
60 errcode_t retval;
61 struct set_badblock_record rec;
62 struct ext2_inode inode;
63
64 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
65
66 if (!fs->block_map)
67 return EXT2_ET_NO_BLOCK_BITMAP;
68
69 memset(&rec, 0, sizeof(rec));
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 indirect 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 retval = ext2fs_inode_size_set(fs, &inode,
132 rec.bad_block_count * fs->blocksize);
133 if (retval)
134 goto cleanup;
135
136 retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
137 if (retval)
138 goto cleanup;
139
140 cleanup:
141 ext2fs_free_mem(&rec.ind_blocks);
142 ext2fs_free_mem(&rec.block_buf);
143 return retval;
144 }
145
146 /*
147 * Helper function for update_bb_inode()
148 *
149 * Clear the bad blocks in the bad block inode, while saving the
150 * indirect blocks.
151 */
152 #ifdef __TURBOC__
153 #pragma argsused
154 #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)155 static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
156 e2_blkcnt_t blockcnt,
157 blk_t ref_block EXT2FS_ATTR((unused)),
158 int ref_offset EXT2FS_ATTR((unused)),
159 void *priv_data)
160 {
161 struct set_badblock_record *rec = (struct set_badblock_record *)
162 priv_data;
163 errcode_t retval;
164 unsigned long old_size;
165
166 if (!*block_nr)
167 return 0;
168
169 /*
170 * If the block number is outrageous, clear it and ignore it.
171 */
172 if (*block_nr >= ext2fs_blocks_count(fs->super) ||
173 *block_nr < fs->super->s_first_data_block) {
174 *block_nr = 0;
175 return BLOCK_CHANGED;
176 }
177
178 if (blockcnt < 0) {
179 if (rec->ind_blocks_size >= rec->max_ind_blocks) {
180 old_size = rec->max_ind_blocks * sizeof(blk_t);
181 rec->max_ind_blocks += 10;
182 retval = ext2fs_resize_mem(old_size,
183 rec->max_ind_blocks * sizeof(blk_t),
184 &rec->ind_blocks);
185 if (retval) {
186 rec->max_ind_blocks -= 10;
187 rec->err = retval;
188 return BLOCK_ABORT;
189 }
190 }
191 rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
192 }
193
194 /*
195 * Mark the block as unused, and update accounting information
196 */
197 ext2fs_block_alloc_stats2(fs, *block_nr, -1);
198
199 *block_nr = 0;
200 return BLOCK_CHANGED;
201 }
202
203
204 /*
205 * Helper function for update_bb_inode()
206 *
207 * Set the block list in the bad block inode, using the supplied bitmap.
208 */
209 #ifdef __TURBOC__
210 #pragma argsused
211 #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)212 static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
213 e2_blkcnt_t blockcnt,
214 blk_t ref_block EXT2FS_ATTR((unused)),
215 int ref_offset EXT2FS_ATTR((unused)),
216 void *priv_data)
217 {
218 struct set_badblock_record *rec = (struct set_badblock_record *)
219 priv_data;
220 errcode_t retval;
221 blk_t blk;
222
223 if (blockcnt >= 0) {
224 /*
225 * Get the next bad block.
226 */
227 if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk))
228 return BLOCK_ABORT;
229 rec->bad_block_count++;
230 } else {
231 /*
232 * An indirect block; fetch a block from the
233 * previously used indirect block list. The block
234 * most be not marked as used; if so, get another one.
235 * If we run out of reserved indirect blocks, allocate
236 * a new one.
237 */
238 retry:
239 if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
240 blk = rec->ind_blocks[rec->ind_blocks_ptr++];
241 if (ext2fs_test_block_bitmap2(fs->block_map, blk))
242 goto retry;
243 } else {
244 retval = ext2fs_new_block(fs, 0, 0, &blk);
245 if (retval) {
246 rec->err = retval;
247 return BLOCK_ABORT;
248 }
249 }
250 retval = io_channel_write_blk64(fs->io, blk, 1, rec->block_buf);
251 if (retval) {
252 rec->err = retval;
253 return BLOCK_ABORT;
254 }
255 }
256
257 /*
258 * Update block counts
259 */
260 ext2fs_block_alloc_stats2(fs, blk, +1);
261
262 *block_nr = blk;
263 return BLOCK_CHANGED;
264 }
265
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