blob: ce77bc9f6b2af9c3da70a80110d2883b7fefae59
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * read_bb --- read the bad blocks inode |
4 | * |
5 | * Copyright (C) 1994 Theodore Ts'o. |
6 | * |
7 | * %Begin-Header% |
8 | * This file may be redistributed under the terms of the GNU Public |
9 | * License. |
10 | * %End-Header% |
11 | */ |
12 | |
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 | { |
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 >= fs->super->s_blocks_count)) |
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 | */ |
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 | if (inode.i_blocks < 500) |
79 | numblocks = (inode.i_blocks / |
80 | (fs->blocksize / 512)) + 20; |
81 | else |
82 | numblocks = 500; |
83 | retval = ext2fs_badblocks_list_create(bb_list, numblocks); |
84 | if (retval) |
85 | return retval; |
86 | } |
87 | |
88 | rb.bb_list = *bb_list; |
89 | rb.err = 0; |
90 | retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, 0, 0, |
91 | mark_bad_block, &rb); |
92 | if (retval) |
93 | return retval; |
94 | |
95 | return rb.err; |
96 | } |
97 |