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
29struct 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
40static 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 >= ext2fs_blocks_count(fs->super)))
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 */
64errcode_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