1 /*
2 * read_bb --- read the bad blocks inode
3 *
4 * Copyright (C) 1994 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12 #include "config.h"
13 #include <stdio.h>
14 #include <string.h>
15 #if HAVE_UNISTD_H
16 #include <unistd.h>
17 #endif
18 #include <fcntl.h>
19 #include <time.h>
20 #if HAVE_SYS_STAT_H
21 #include <sys/stat.h>
22 #endif
23 #if HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif
26
27 #include "ext2_fs.h"
28 #include "ext2fs.h"
29
30 struct read_bb_record {
31 ext2_badblocks_list bb_list;
32 errcode_t err;
33 };
34
35 /*
36 * Helper function for ext2fs_read_bb_inode()
37 */
38 #ifdef __TURBOC__
39 #pragma argsused
40 #endif
mark_bad_block(ext2_filsys fs,blk_t * block_nr,e2_blkcnt_t blockcnt EXT2FS_ATTR ((unused)),blk_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * priv_data)41 static int mark_bad_block(ext2_filsys fs, blk_t *block_nr,
42 e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
43 blk_t ref_block EXT2FS_ATTR((unused)),
44 int ref_offset EXT2FS_ATTR((unused)),
45 void *priv_data)
46 {
47 struct read_bb_record *rb = (struct read_bb_record *) priv_data;
48
49 if (blockcnt < 0)
50 return 0;
51
52 if ((*block_nr < fs->super->s_first_data_block) ||
53 (*block_nr >= ext2fs_blocks_count(fs->super)))
54 return 0; /* Ignore illegal blocks */
55
56 rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr);
57 if (rb->err)
58 return BLOCK_ABORT;
59 return 0;
60 }
61
62 /*
63 * Reads the current bad blocks from the bad blocks inode.
64 */
ext2fs_read_bb_inode(ext2_filsys fs,ext2_badblocks_list * bb_list)65 errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list)
66 {
67 errcode_t retval;
68 struct read_bb_record rb;
69 struct ext2_inode inode;
70 blk_t numblocks;
71
72 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
73
74 if (!*bb_list) {
75 retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
76 if (retval)
77 return retval;
78 numblocks = inode.i_blocks;
79 if (!(ext2fs_has_feature_huge_file(fs->super) &&
80 (inode.i_flags & EXT4_HUGE_FILE_FL)))
81 numblocks = numblocks / (fs->blocksize / 512);
82 numblocks += 20;
83 if (numblocks < 50)
84 numblocks = 50;
85 if (numblocks > 50000)
86 numblocks = 500;
87 retval = ext2fs_badblocks_list_create(bb_list, numblocks);
88 if (retval)
89 return retval;
90 }
91
92 rb.bb_list = *bb_list;
93 rb.err = 0;
94 retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, BLOCK_FLAG_READ_ONLY,
95 0, mark_bad_block, &rb);
96 if (retval)
97 return retval;
98
99 return rb.err;
100 }
101
102
103