1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * bb_inode.c --- routines to update the bad block inode.
|
---|
4 | *
|
---|
5 | * WARNING: This routine modifies a lot of state in the filesystem; if
|
---|
6 | * this routine returns an error, the bad block inode may be in an
|
---|
7 | * inconsistent state.
|
---|
8 | *
|
---|
9 | * Copyright (C) 1994, 1995 Theodore Ts'o.
|
---|
10 | *
|
---|
11 | * %Begin-Header%
|
---|
12 | * This file may be redistributed under the terms of the GNU Public
|
---|
13 | * License.
|
---|
14 | * %End-Header%
|
---|
15 | */
|
---|
16 |
|
---|
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 | */
|
---|
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 | rec.bad_block_count = 0;
|
---|
70 | rec.ind_blocks_size = rec.ind_blocks_ptr = 0;
|
---|
71 | rec.max_ind_blocks = 10;
|
---|
72 | retval = ext2fs_get_mem(rec.max_ind_blocks * sizeof(blk_t),
|
---|
73 | &rec.ind_blocks);
|
---|
74 | if (retval)
|
---|
75 | return retval;
|
---|
76 | memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t));
|
---|
77 | retval = ext2fs_get_mem(fs->blocksize, &rec.block_buf);
|
---|
78 | if (retval)
|
---|
79 | goto cleanup;
|
---|
80 | memset(rec.block_buf, 0, fs->blocksize);
|
---|
81 | rec.err = 0;
|
---|
82 |
|
---|
83 | /*
|
---|
84 | * First clear the old bad blocks (while saving the indirect blocks)
|
---|
85 | */
|
---|
86 | retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
|
---|
87 | BLOCK_FLAG_DEPTH_TRAVERSE, 0,
|
---|
88 | clear_bad_block_proc, &rec);
|
---|
89 | if (retval)
|
---|
90 | goto cleanup;
|
---|
91 | if (rec.err) {
|
---|
92 | retval = rec.err;
|
---|
93 | goto cleanup;
|
---|
94 | }
|
---|
95 |
|
---|
96 | /*
|
---|
97 | * Now set the bad blocks!
|
---|
98 | *
|
---|
99 | * First, mark the bad blocks as used. This prevents a bad
|
---|
100 | * block from being used as an indirecto block for the bad
|
---|
101 | * block inode (!).
|
---|
102 | */
|
---|
103 | if (bb_list) {
|
---|
104 | retval = ext2fs_badblocks_list_iterate_begin(bb_list,
|
---|
105 | &rec.bb_iter);
|
---|
106 | if (retval)
|
---|
107 | goto cleanup;
|
---|
108 | retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
|
---|
109 | BLOCK_FLAG_APPEND, 0,
|
---|
110 | set_bad_block_proc, &rec);
|
---|
111 | ext2fs_badblocks_list_iterate_end(rec.bb_iter);
|
---|
112 | if (retval)
|
---|
113 | goto cleanup;
|
---|
114 | if (rec.err) {
|
---|
115 | retval = rec.err;
|
---|
116 | goto cleanup;
|
---|
117 | }
|
---|
118 | }
|
---|
119 |
|
---|
120 | /*
|
---|
121 | * Update the bad block inode's mod time and block count
|
---|
122 | * field.
|
---|
123 | */
|
---|
124 | retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
|
---|
125 | if (retval)
|
---|
126 | goto cleanup;
|
---|
127 |
|
---|
128 | inode.i_atime = inode.i_mtime = time(0);
|
---|
129 | if (!inode.i_ctime)
|
---|
130 | inode.i_ctime = time(0);
|
---|
131 | inode.i_blocks = rec.bad_block_count * (fs->blocksize / 512);
|
---|
132 | inode.i_size = rec.bad_block_count * fs->blocksize;
|
---|
133 |
|
---|
134 | retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
|
---|
135 | if (retval)
|
---|
136 | goto cleanup;
|
---|
137 |
|
---|
138 | cleanup:
|
---|
139 | ext2fs_free_mem(&rec.ind_blocks);
|
---|
140 | ext2fs_free_mem(&rec.block_buf);
|
---|
141 | return retval;
|
---|
142 | }
|
---|
143 |
|
---|
144 | /*
|
---|
145 | * Helper function for update_bb_inode()
|
---|
146 | *
|
---|
147 | * Clear the bad blocks in the bad block inode, while saving the
|
---|
148 | * indirect blocks.
|
---|
149 | */
|
---|
150 | #ifdef __TURBOC__
|
---|
151 | # pragma argsused
|
---|
152 | #endif
|
---|
153 | static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
|
---|
154 | e2_blkcnt_t blockcnt,
|
---|
155 | blk_t ref_block EXT2FS_ATTR((unused)),
|
---|
156 | int ref_offset EXT2FS_ATTR((unused)),
|
---|
157 | void *priv_data)
|
---|
158 | {
|
---|
159 | struct set_badblock_record *rec = (struct set_badblock_record *)
|
---|
160 | priv_data;
|
---|
161 | errcode_t retval;
|
---|
162 | unsigned long old_size;
|
---|
163 |
|
---|
164 | if (!*block_nr)
|
---|
165 | return 0;
|
---|
166 |
|
---|
167 | /*
|
---|
168 | * If the block number is outrageous, clear it and ignore it.
|
---|
169 | */
|
---|
170 | if (*block_nr >= fs->super->s_blocks_count ||
|
---|
171 | *block_nr < fs->super->s_first_data_block) {
|
---|
172 | *block_nr = 0;
|
---|
173 | return BLOCK_CHANGED;
|
---|
174 | }
|
---|
175 |
|
---|
176 | if (blockcnt < 0) {
|
---|
177 | if (rec->ind_blocks_size >= rec->max_ind_blocks) {
|
---|
178 | old_size = rec->max_ind_blocks * sizeof(blk_t);
|
---|
179 | rec->max_ind_blocks += 10;
|
---|
180 | retval = ext2fs_resize_mem(old_size,
|
---|
181 | rec->max_ind_blocks * sizeof(blk_t),
|
---|
182 | &rec->ind_blocks);
|
---|
183 | if (retval) {
|
---|
184 | rec->max_ind_blocks -= 10;
|
---|
185 | rec->err = retval;
|
---|
186 | return BLOCK_ABORT;
|
---|
187 | }
|
---|
188 | }
|
---|
189 | rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
|
---|
190 | }
|
---|
191 |
|
---|
192 | /*
|
---|
193 | * Mark the block as unused, and update accounting information
|
---|
194 | */
|
---|
195 | ext2fs_block_alloc_stats(fs, *block_nr, -1);
|
---|
196 |
|
---|
197 | *block_nr = 0;
|
---|
198 | return BLOCK_CHANGED;
|
---|
199 | }
|
---|
200 |
|
---|
201 |
|
---|
202 | /*
|
---|
203 | * Helper function for update_bb_inode()
|
---|
204 | *
|
---|
205 | * Set the block list in the bad block inode, using the supplied bitmap.
|
---|
206 | */
|
---|
207 | #ifdef __TURBOC__
|
---|
208 | #pragma argsused
|
---|
209 | #endif
|
---|
210 | static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
|
---|
211 | e2_blkcnt_t blockcnt,
|
---|
212 | blk_t ref_block EXT2FS_ATTR((unused)),
|
---|
213 | int ref_offset EXT2FS_ATTR((unused)),
|
---|
214 | void *priv_data)
|
---|
215 | {
|
---|
216 | struct set_badblock_record *rec = (struct set_badblock_record *)
|
---|
217 | priv_data;
|
---|
218 | errcode_t retval;
|
---|
219 | blk_t blk;
|
---|
220 |
|
---|
221 | if (blockcnt >= 0) {
|
---|
222 | /*
|
---|
223 | * Get the next bad block.
|
---|
224 | */
|
---|
225 | if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk))
|
---|
226 | return BLOCK_ABORT;
|
---|
227 | rec->bad_block_count++;
|
---|
228 | } else {
|
---|
229 | /*
|
---|
230 | * An indirect block; fetch a block from the
|
---|
231 | * previously used indirect block list. The block
|
---|
232 | * most be not marked as used; if so, get another one.
|
---|
233 | * If we run out of reserved indirect blocks, allocate
|
---|
234 | * a new one.
|
---|
235 | */
|
---|
236 | retry:
|
---|
237 | if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
|
---|
238 | blk = rec->ind_blocks[rec->ind_blocks_ptr++];
|
---|
239 | if (ext2fs_test_block_bitmap(fs->block_map, blk))
|
---|
240 | goto retry;
|
---|
241 | } else {
|
---|
242 | retval = ext2fs_new_block(fs, 0, 0, &blk);
|
---|
243 | if (retval) {
|
---|
244 | rec->err = retval;
|
---|
245 | return BLOCK_ABORT;
|
---|
246 | }
|
---|
247 | }
|
---|
248 | retval = io_channel_write_blk(fs->io, blk, 1, rec->block_buf);
|
---|
249 | if (retval) {
|
---|
250 | rec->err = retval;
|
---|
251 | return BLOCK_ABORT;
|
---|
252 | }
|
---|
253 | }
|
---|
254 |
|
---|
255 | /*
|
---|
256 | * Update block counts
|
---|
257 | */
|
---|
258 | ext2fs_block_alloc_stats(fs, blk, +1);
|
---|
259 |
|
---|
260 | *block_nr = blk;
|
---|
261 | return BLOCK_CHANGED;
|
---|
262 | }
|
---|
263 |
|
---|
264 |
|
---|
265 |
|
---|
266 |
|
---|
267 |
|
---|
268 |
|
---|