/src/e2fsprogs/lib/ext2fs/read_bb.c
Line | Count | Source |
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 |
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 | 0 | { |
47 | 0 | struct read_bb_record *rb = (struct read_bb_record *) priv_data; |
48 | |
|
49 | 0 | if (blockcnt < 0) |
50 | 0 | return 0; |
51 | | |
52 | 0 | if ((*block_nr < fs->super->s_first_data_block) || |
53 | 0 | (*block_nr >= ext2fs_blocks_count(fs->super))) |
54 | 0 | return 0; /* Ignore illegal blocks */ |
55 | | |
56 | 0 | rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr); |
57 | 0 | if (rb->err) |
58 | 0 | return BLOCK_ABORT; |
59 | 0 | return 0; |
60 | 0 | } |
61 | | |
62 | | /* |
63 | | * Reads the current bad blocks from the bad blocks inode. |
64 | | */ |
65 | | errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list) |
66 | 0 | { |
67 | 0 | errcode_t retval; |
68 | 0 | struct read_bb_record rb; |
69 | 0 | struct ext2_inode inode; |
70 | 0 | blk_t numblocks; |
71 | |
|
72 | 0 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
73 | | |
74 | 0 | if (!*bb_list) { |
75 | 0 | retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode); |
76 | 0 | if (retval) |
77 | 0 | return retval; |
78 | 0 | numblocks = inode.i_blocks; |
79 | 0 | if (!(ext2fs_has_feature_huge_file(fs->super) && |
80 | 0 | (inode.i_flags & EXT4_HUGE_FILE_FL))) |
81 | 0 | numblocks = numblocks / (fs->blocksize / 512); |
82 | 0 | numblocks += 20; |
83 | 0 | if (numblocks < 50) |
84 | 0 | numblocks = 50; |
85 | 0 | if (numblocks > 50000) |
86 | 0 | numblocks = 500; |
87 | 0 | retval = ext2fs_badblocks_list_create(bb_list, numblocks); |
88 | 0 | if (retval) |
89 | 0 | return retval; |
90 | 0 | } |
91 | | |
92 | 0 | rb.bb_list = *bb_list; |
93 | 0 | rb.err = 0; |
94 | 0 | retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, BLOCK_FLAG_READ_ONLY, |
95 | 0 | 0, mark_bad_block, &rb); |
96 | 0 | if (retval) |
97 | 0 | return retval; |
98 | | |
99 | 0 | return rb.err; |
100 | 0 | } |
101 | | |
102 | | |