[821] | 1 | /*
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| 2 | * bb_inode.c --- routines to update the bad block inode.
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| 3 | *
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| 4 | * WARNING: This routine modifies a lot of state in the filesystem; if
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| 5 | * this routine returns an error, the bad block inode may be in an
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| 6 | * inconsistent state.
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| 7 | *
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| 8 | * Copyright (C) 1994, 1995 Theodore Ts'o.
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| 9 | *
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| 10 | * %Begin-Header%
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| 11 | * This file may be redistributed under the terms of the GNU Public
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| 12 | * License.
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| 13 | * %End-Header%
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| 14 | */
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| 15 |
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| 16 | #include <stdio.h>
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| 17 | #include <string.h>
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| 18 | #if HAVE_UNISTD_H
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| 19 | #include <unistd.h>
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| 20 | #endif
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| 21 | #include <fcntl.h>
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| 22 | #include <time.h>
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| 23 | #if HAVE_SYS_STAT_H
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| 24 | #include <sys/stat.h>
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| 25 | #endif
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| 26 | #if HAVE_SYS_TYPES_H
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| 27 | #include <sys/types.h>
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| 28 | #endif
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| 29 |
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| 30 | #include "ext2_fs.h"
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| 31 | #include "ext2fs.h"
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| 32 |
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| 33 | struct set_badblock_record {
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| 34 | ext2_badblocks_iterate bb_iter;
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| 35 | int bad_block_count;
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| 36 | blk_t *ind_blocks;
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| 37 | int max_ind_blocks;
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| 38 | int ind_blocks_size;
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| 39 | int ind_blocks_ptr;
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| 40 | char *block_buf;
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| 41 | errcode_t err;
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| 42 | };
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| 43 |
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| 44 | static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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| 45 | e2_blkcnt_t blockcnt,
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| 46 | blk_t ref_block, int ref_offset,
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| 47 | void *priv_data);
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| 48 | static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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| 49 | e2_blkcnt_t blockcnt,
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| 50 | blk_t ref_block, int ref_offset,
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| 51 | void *priv_data);
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| 52 |
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| 53 | /*
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| 54 | * Given a bad blocks bitmap, update the bad blocks inode to reflect
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| 55 | * the map.
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| 56 | */
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| 57 | errcode_t ext2fs_update_bb_inode(ext2_filsys fs, ext2_badblocks_list bb_list)
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| 58 | {
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| 59 | errcode_t retval;
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| 60 | struct set_badblock_record rec;
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| 61 | struct ext2_inode inode;
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| 62 |
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| 63 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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| 64 |
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| 65 | if (!fs->block_map)
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| 66 | return EXT2_ET_NO_BLOCK_BITMAP;
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| 67 |
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| 68 | rec.bad_block_count = 0;
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| 69 | rec.ind_blocks_size = rec.ind_blocks_ptr = 0;
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| 70 | rec.max_ind_blocks = 10;
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| 71 | retval = ext2fs_get_mem(rec.max_ind_blocks * sizeof(blk_t),
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| 72 | &rec.ind_blocks);
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| 73 | if (retval)
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| 74 | return retval;
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| 75 | memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t));
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| 76 | retval = ext2fs_get_mem(fs->blocksize, &rec.block_buf);
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| 77 | if (retval)
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| 78 | goto cleanup;
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| 79 | memset(rec.block_buf, 0, fs->blocksize);
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| 80 | rec.err = 0;
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| 81 |
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| 82 | /*
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| 83 | * First clear the old bad blocks (while saving the indirect blocks)
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| 84 | */
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| 85 | retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
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| 86 | BLOCK_FLAG_DEPTH_TRAVERSE, 0,
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| 87 | clear_bad_block_proc, &rec);
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| 88 | if (retval)
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| 89 | goto cleanup;
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| 90 | if (rec.err) {
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| 91 | retval = rec.err;
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| 92 | goto cleanup;
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| 93 | }
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| 94 |
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| 95 | /*
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| 96 | * Now set the bad blocks!
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| 97 | *
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| 98 | * First, mark the bad blocks as used. This prevents a bad
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| 99 | * block from being used as an indirecto block for the bad
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| 100 | * block inode (!).
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| 101 | */
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| 102 | if (bb_list) {
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| 103 | retval = ext2fs_badblocks_list_iterate_begin(bb_list,
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| 104 | &rec.bb_iter);
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| 105 | if (retval)
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| 106 | goto cleanup;
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| 107 | retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
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| 108 | BLOCK_FLAG_APPEND, 0,
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| 109 | set_bad_block_proc, &rec);
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| 110 | ext2fs_badblocks_list_iterate_end(rec.bb_iter);
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| 111 | if (retval)
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| 112 | goto cleanup;
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| 113 | if (rec.err) {
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| 114 | retval = rec.err;
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| 115 | goto cleanup;
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| 116 | }
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| 117 | }
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| 118 |
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| 119 | /*
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| 120 | * Update the bad block inode's mod time and block count
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| 121 | * field.
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| 122 | */
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| 123 | retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
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| 124 | if (retval)
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| 125 | goto cleanup;
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| 126 |
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| 127 | inode.i_atime = inode.i_mtime = time(0);
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| 128 | if (!inode.i_ctime)
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| 129 | inode.i_ctime = time(0);
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| 130 | inode.i_blocks = rec.bad_block_count * (fs->blocksize / 512);
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| 131 | inode.i_size = rec.bad_block_count * fs->blocksize;
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| 132 |
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| 133 | retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
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| 134 | if (retval)
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| 135 | goto cleanup;
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| 136 |
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| 137 | cleanup:
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| 138 | ext2fs_free_mem(&rec.ind_blocks);
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| 139 | ext2fs_free_mem(&rec.block_buf);
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| 140 | return retval;
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| 141 | }
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| 142 |
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| 143 | /*
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| 144 | * Helper function for update_bb_inode()
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| 145 | *
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| 146 | * Clear the bad blocks in the bad block inode, while saving the
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| 147 | * indirect blocks.
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| 148 | */
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| 149 | #ifdef __TURBOC__
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| 150 | # pragma argsused
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| 151 | #endif
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| 152 | static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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| 153 | e2_blkcnt_t blockcnt,
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| 154 | blk_t ref_block EXT2FS_ATTR((unused)),
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| 155 | int ref_offset EXT2FS_ATTR((unused)),
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| 156 | void *priv_data)
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| 157 | {
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| 158 | struct set_badblock_record *rec = (struct set_badblock_record *)
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| 159 | priv_data;
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| 160 | errcode_t retval;
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| 161 | unsigned long old_size;
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| 162 |
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| 163 | if (!*block_nr)
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| 164 | return 0;
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| 165 |
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| 166 | /*
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| 167 | * If the block number is outrageous, clear it and ignore it.
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| 168 | */
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| 169 | if (*block_nr >= fs->super->s_blocks_count ||
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| 170 | *block_nr < fs->super->s_first_data_block) {
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| 171 | *block_nr = 0;
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| 172 | return BLOCK_CHANGED;
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| 173 | }
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| 174 |
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| 175 | if (blockcnt < 0) {
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| 176 | if (rec->ind_blocks_size >= rec->max_ind_blocks) {
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| 177 | old_size = rec->max_ind_blocks * sizeof(blk_t);
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| 178 | rec->max_ind_blocks += 10;
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| 179 | retval = ext2fs_resize_mem(old_size,
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| 180 | rec->max_ind_blocks * sizeof(blk_t),
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| 181 | &rec->ind_blocks);
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| 182 | if (retval) {
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| 183 | rec->max_ind_blocks -= 10;
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| 184 | rec->err = retval;
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| 185 | return BLOCK_ABORT;
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| 186 | }
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| 187 | }
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| 188 | rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
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| 189 | }
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| 190 |
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| 191 | /*
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| 192 | * Mark the block as unused, and update accounting information
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| 193 | */
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| 194 | ext2fs_block_alloc_stats(fs, *block_nr, -1);
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| 195 |
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| 196 | *block_nr = 0;
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| 197 | return BLOCK_CHANGED;
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| 198 | }
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| 199 |
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| 200 |
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| 201 | /*
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| 202 | * Helper function for update_bb_inode()
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| 203 | *
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| 204 | * Set the block list in the bad block inode, using the supplied bitmap.
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| 205 | */
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| 206 | #ifdef __TURBOC__
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| 207 | #pragma argsused
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| 208 | #endif
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| 209 | static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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| 210 | e2_blkcnt_t blockcnt,
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| 211 | blk_t ref_block EXT2FS_ATTR((unused)),
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| 212 | int ref_offset EXT2FS_ATTR((unused)),
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| 213 | void *priv_data)
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| 214 | {
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| 215 | struct set_badblock_record *rec = (struct set_badblock_record *)
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| 216 | priv_data;
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| 217 | errcode_t retval;
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| 218 | blk_t blk;
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| 219 |
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| 220 | if (blockcnt >= 0) {
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| 221 | /*
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| 222 | * Get the next bad block.
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| 223 | */
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| 224 | if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk))
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| 225 | return BLOCK_ABORT;
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| 226 | rec->bad_block_count++;
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| 227 | } else {
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| 228 | /*
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| 229 | * An indirect block; fetch a block from the
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| 230 | * previously used indirect block list. The block
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| 231 | * most be not marked as used; if so, get another one.
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| 232 | * If we run out of reserved indirect blocks, allocate
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| 233 | * a new one.
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| 234 | */
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| 235 | retry:
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| 236 | if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
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| 237 | blk = rec->ind_blocks[rec->ind_blocks_ptr++];
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| 238 | if (ext2fs_test_block_bitmap(fs->block_map, blk))
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| 239 | goto retry;
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| 240 | } else {
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| 241 | retval = ext2fs_new_block(fs, 0, 0, &blk);
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| 242 | if (retval) {
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| 243 | rec->err = retval;
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| 244 | return BLOCK_ABORT;
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| 245 | }
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| 246 | }
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| 247 | retval = io_channel_write_blk(fs->io, blk, 1, rec->block_buf);
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| 248 | if (retval) {
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| 249 | rec->err = retval;
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| 250 | return BLOCK_ABORT;
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| 251 | }
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| 252 | }
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| 253 |
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| 254 | /*
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| 255 | * Update block counts
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| 256 | */
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| 257 | ext2fs_block_alloc_stats(fs, blk, +1);
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| 258 |
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| 259 | *block_nr = blk;
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| 260 | return BLOCK_CHANGED;
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| 261 | }
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| 262 |
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| 263 |
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| 264 |
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| 265 |
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| 266 |
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| 267 |
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