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 <stdio.h>
13 #include <string.h>
14 #if HAVE_UNISTD_H
15 #include <unistd.h>
16 #endif
17 #include <fcntl.h>
18 #include <time.h>
19 #if HAVE_SYS_STAT_H
20 #include <sys/stat.h>
21 #endif
22 #if HAVE_SYS_TYPES_H
23 #include <sys/types.h>
24 #endif
25
26 #include "ext2_fs.h"
27 #include "ext2fs.h"
28
29 struct read_bb_record {
30 ext2_badblocks_list bb_list;
31 errcode_t err;
32 };
33
34 /*
35 * Helper function for ext2fs_read_bb_inode()
36 */
37 #ifdef __TURBOC__
38 #pragma argsused
39 #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)40 static int mark_bad_block(ext2_filsys fs, blk_t *block_nr,
41 e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
42 blk_t ref_block EXT2FS_ATTR((unused)),
43 int ref_offset EXT2FS_ATTR((unused)),
44 void *priv_data)
45 {
46 struct read_bb_record *rb = (struct read_bb_record *) priv_data;
47
48 if (blockcnt < 0)
49 return 0;
50
51 if ((*block_nr < fs->super->s_first_data_block) ||
52 (*block_nr >= fs->super->s_blocks_count))
53 return 0; /* Ignore illegal blocks */
54
55 rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr);
56 if (rb->err)
57 return BLOCK_ABORT;
58 return 0;
59 }
60
61 /*
62 * Reads the current bad blocks from the bad blocks inode.
63 */
ext2fs_read_bb_inode(ext2_filsys fs,ext2_badblocks_list * bb_list)64 errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list)
65 {
66 errcode_t retval;
67 struct read_bb_record rb;
68 struct ext2_inode inode;
69 blk_t numblocks;
70
71 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
72
73 if (!*bb_list) {
74 retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
75 if (retval)
76 return retval;
77 numblocks = inode.i_blocks;
78 if (!((fs->super->s_feature_ro_compat &
79 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) &&
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