| 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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