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