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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 
263 
264 
265 
266 
267 
268