bb_inode.c revision e0ed7404719a9ddd2ba427a80db5365c8bad18c0 
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
33struct 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
44static 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);
48static 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 */
57errcode_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	memset(&rec, 0, sizeof(rec));
69	rec.max_ind_blocks = 10;
70	retval = ext2fs_get_array(rec.max_ind_blocks, sizeof(blk_t),
71				&rec.ind_blocks);
72	if (retval)
73		return retval;
74	memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t));
75	retval = ext2fs_get_mem(fs->blocksize, &rec.block_buf);
76	if (retval)
77		goto cleanup;
78	memset(rec.block_buf, 0, fs->blocksize);
79	rec.err = 0;
80
81	/*
82	 * First clear the old bad blocks (while saving the indirect blocks)
83	 */
84	retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
85				       BLOCK_FLAG_DEPTH_TRAVERSE, 0,
86				       clear_bad_block_proc, &rec);
87	if (retval)
88		goto cleanup;
89	if (rec.err) {
90		retval = rec.err;
91		goto cleanup;
92	}
93
94	/*
95	 * Now set the bad blocks!
96	 *
97	 * First, mark the bad blocks as used.  This prevents a bad
98	 * block from being used as an indirecto block for the bad
99	 * block inode (!).
100	 */
101	if (bb_list) {
102		retval = ext2fs_badblocks_list_iterate_begin(bb_list,
103							     &rec.bb_iter);
104		if (retval)
105			goto cleanup;
106		retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
107					       BLOCK_FLAG_APPEND, 0,
108					       set_bad_block_proc, &rec);
109		ext2fs_badblocks_list_iterate_end(rec.bb_iter);
110		if (retval)
111			goto cleanup;
112		if (rec.err) {
113			retval = rec.err;
114			goto cleanup;
115		}
116	}
117
118	/*
119	 * Update the bad block inode's mod time and block count
120	 * field.
121	 */
122	retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
123	if (retval)
124		goto cleanup;
125
126	inode.i_atime = inode.i_mtime = fs->now ? fs->now : time(0);
127	if (!inode.i_ctime)
128		inode.i_ctime = fs->now ? fs->now : time(0);
129	ext2fs_iblk_set(fs, &inode, rec.bad_block_count);
130	inode.i_size = rec.bad_block_count * fs->blocksize;
131
132	retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
133	if (retval)
134		goto cleanup;
135
136cleanup:
137	ext2fs_free_mem(&rec.ind_blocks);
138	ext2fs_free_mem(&rec.block_buf);
139	return retval;
140}
141
142/*
143 * Helper function for update_bb_inode()
144 *
145 * Clear the bad blocks in the bad block inode, while saving the
146 * indirect blocks.
147 */
148#ifdef __TURBOC__
149 #pragma argsused
150#endif
151static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
152				e2_blkcnt_t blockcnt,
153				blk_t ref_block EXT2FS_ATTR((unused)),
154				int ref_offset EXT2FS_ATTR((unused)),
155				void *priv_data)
156{
157	struct set_badblock_record *rec = (struct set_badblock_record *)
158		priv_data;
159	errcode_t	retval;
160	unsigned long 	old_size;
161
162	if (!*block_nr)
163		return 0;
164
165	/*
166	 * If the block number is outrageous, clear it and ignore it.
167	 */
168	if (*block_nr >= ext2fs_blocks_count(fs->super) ||
169	    *block_nr < fs->super->s_first_data_block) {
170		*block_nr = 0;
171		return BLOCK_CHANGED;
172	}
173
174	if (blockcnt < 0) {
175		if (rec->ind_blocks_size >= rec->max_ind_blocks) {
176			old_size = rec->max_ind_blocks * sizeof(blk_t);
177			rec->max_ind_blocks += 10;
178			retval = ext2fs_resize_mem(old_size,
179				   rec->max_ind_blocks * sizeof(blk_t),
180				   &rec->ind_blocks);
181			if (retval) {
182				rec->max_ind_blocks -= 10;
183				rec->err = retval;
184				return BLOCK_ABORT;
185			}
186		}
187		rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
188	}
189
190	/*
191	 * Mark the block as unused, and update accounting information
192	 */
193	ext2fs_block_alloc_stats2(fs, *block_nr, -1);
194
195	*block_nr = 0;
196	return BLOCK_CHANGED;
197}
198
199
200/*
201 * Helper function for update_bb_inode()
202 *
203 * Set the block list in the bad block inode, using the supplied bitmap.
204 */
205#ifdef __TURBOC__
206 #pragma argsused
207#endif
208static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
209			      e2_blkcnt_t blockcnt,
210			      blk_t ref_block EXT2FS_ATTR((unused)),
211			      int ref_offset EXT2FS_ATTR((unused)),
212			      void *priv_data)
213{
214	struct set_badblock_record *rec = (struct set_badblock_record *)
215		priv_data;
216	errcode_t	retval;
217	blk_t		blk;
218
219	if (blockcnt >= 0) {
220		/*
221		 * Get the next bad block.
222		 */
223		if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk))
224			return BLOCK_ABORT;
225		rec->bad_block_count++;
226	} else {
227		/*
228		 * An indirect block; fetch a block from the
229		 * previously used indirect block list.  The block
230		 * most be not marked as used; if so, get another one.
231		 * If we run out of reserved indirect blocks, allocate
232		 * a new one.
233		 */
234	retry:
235		if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
236			blk = rec->ind_blocks[rec->ind_blocks_ptr++];
237			if (ext2fs_test_block_bitmap2(fs->block_map, blk))
238				goto retry;
239		} else {
240			retval = ext2fs_new_block(fs, 0, 0, &blk);
241			if (retval) {
242				rec->err = retval;
243				return BLOCK_ABORT;
244			}
245		}
246		retval = io_channel_write_blk64(fs->io, blk, 1, rec->block_buf);
247		if (retval) {
248			rec->err = retval;
249			return BLOCK_ABORT;
250		}
251	}
252
253	/*
254	 * Update block counts
255	 */
256	ext2fs_block_alloc_stats2(fs, blk, +1);
257
258	*block_nr = blk;
259	return BLOCK_CHANGED;
260}
261
262
263
264
265
266
267