1 /* 2 * bb_inode.c --- routines to update the bad block inode. 3 * 4 * WARNING: This routine modifies a lot of state in the filesystem; if 5 * this routine returns an error, the bad block inode may be in an 6 * inconsistent state. 7 * 8 * Copyright (C) 1994, 1995 Theodore Ts'o. 9 * 10 * %Begin-Header% 11 * This file may be redistributed under the terms of the GNU Library 12 * General Public License, version 2. 13 * %End-Header% 14 */ 15 16 #include "config.h" 17 #include <stdio.h> 18 #include <string.h> 19 #if HAVE_UNISTD_H 20 #include <unistd.h> 21 #endif 22 #include <fcntl.h> 23 #include <time.h> 24 #if HAVE_SYS_STAT_H 25 #include <sys/stat.h> 26 #endif 27 #if HAVE_SYS_TYPES_H 28 #include <sys/types.h> 29 #endif 30 31 #include "ext2_fs.h" 32 #include "ext2fs.h" 33 34 struct set_badblock_record { 35 ext2_badblocks_iterate bb_iter; 36 int bad_block_count; 37 blk_t *ind_blocks; 38 int max_ind_blocks; 39 int ind_blocks_size; 40 int ind_blocks_ptr; 41 char *block_buf; 42 errcode_t err; 43 }; 44 45 static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr, 46 e2_blkcnt_t blockcnt, 47 blk_t ref_block, int ref_offset, 48 void *priv_data); 49 static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr, 50 e2_blkcnt_t blockcnt, 51 blk_t ref_block, int ref_offset, 52 void *priv_data); 53 54 /* 55 * Given a bad blocks bitmap, update the bad blocks inode to reflect 56 * the map. 57 */ 58 errcode_t ext2fs_update_bb_inode(ext2_filsys fs, ext2_badblocks_list bb_list) 59 { 60 errcode_t retval; 61 struct set_badblock_record rec; 62 struct ext2_inode inode; 63 64 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 65 66 if (!fs->block_map) 67 return EXT2_ET_NO_BLOCK_BITMAP; 68 69 memset(&rec, 0, sizeof(rec)); 70 rec.max_ind_blocks = 10; 71 retval = ext2fs_get_array(rec.max_ind_blocks, sizeof(blk_t), 72 &rec.ind_blocks); 73 if (retval) 74 return retval; 75 memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t)); 76 retval = ext2fs_get_mem(fs->blocksize, &rec.block_buf); 77 if (retval) 78 goto cleanup; 79 memset(rec.block_buf, 0, fs->blocksize); 80 rec.err = 0; 81 82 /* 83 * First clear the old bad blocks (while saving the indirect blocks) 84 */ 85 retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, 86 BLOCK_FLAG_DEPTH_TRAVERSE, 0, 87 clear_bad_block_proc, &rec); 88 if (retval) 89 goto cleanup; 90 if (rec.err) { 91 retval = rec.err; 92 goto cleanup; 93 } 94 95 /* 96 * Now set the bad blocks! 97 * 98 * First, mark the bad blocks as used. This prevents a bad 99 * block from being used as an indirecto block for the bad 100 * block inode (!). 101 */ 102 if (bb_list) { 103 retval = ext2fs_badblocks_list_iterate_begin(bb_list, 104 &rec.bb_iter); 105 if (retval) 106 goto cleanup; 107 retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, 108 BLOCK_FLAG_APPEND, 0, 109 set_bad_block_proc, &rec); 110 ext2fs_badblocks_list_iterate_end(rec.bb_iter); 111 if (retval) 112 goto cleanup; 113 if (rec.err) { 114 retval = rec.err; 115 goto cleanup; 116 } 117 } 118 119 /* 120 * Update the bad block inode's mod time and block count 121 * field. 122 */ 123 retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode); 124 if (retval) 125 goto cleanup; 126 127 inode.i_atime = inode.i_mtime = fs->now ? fs->now : time(0); 128 if (!inode.i_ctime) 129 inode.i_ctime = fs->now ? fs->now : time(0); 130 ext2fs_iblk_set(fs, &inode, rec.bad_block_count); 131 retval = ext2fs_inode_size_set(fs, &inode, 132 rec.bad_block_count * fs->blocksize); 133 if (retval) 134 goto cleanup; 135 136 retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode); 137 if (retval) 138 goto cleanup; 139 140 cleanup: 141 ext2fs_free_mem(&rec.ind_blocks); 142 ext2fs_free_mem(&rec.block_buf); 143 return retval; 144 } 145 146 /* 147 * Helper function for update_bb_inode() 148 * 149 * Clear the bad blocks in the bad block inode, while saving the 150 * indirect blocks. 151 */ 152 #ifdef __TURBOC__ 153 #pragma argsused 154 #endif 155 static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr, 156 e2_blkcnt_t blockcnt, 157 blk_t ref_block EXT2FS_ATTR((unused)), 158 int ref_offset EXT2FS_ATTR((unused)), 159 void *priv_data) 160 { 161 struct set_badblock_record *rec = (struct set_badblock_record *) 162 priv_data; 163 errcode_t retval; 164 unsigned long old_size; 165 166 if (!*block_nr) 167 return 0; 168 169 /* 170 * If the block number is outrageous, clear it and ignore it. 171 */ 172 if (*block_nr >= ext2fs_blocks_count(fs->super) || 173 *block_nr < fs->super->s_first_data_block) { 174 *block_nr = 0; 175 return BLOCK_CHANGED; 176 } 177 178 if (blockcnt < 0) { 179 if (rec->ind_blocks_size >= rec->max_ind_blocks) { 180 old_size = rec->max_ind_blocks * sizeof(blk_t); 181 rec->max_ind_blocks += 10; 182 retval = ext2fs_resize_mem(old_size, 183 rec->max_ind_blocks * sizeof(blk_t), 184 &rec->ind_blocks); 185 if (retval) { 186 rec->max_ind_blocks -= 10; 187 rec->err = retval; 188 return BLOCK_ABORT; 189 } 190 } 191 rec->ind_blocks[rec->ind_blocks_size++] = *block_nr; 192 } 193 194 /* 195 * Mark the block as unused, and update accounting information 196 */ 197 ext2fs_block_alloc_stats2(fs, *block_nr, -1); 198 199 *block_nr = 0; 200 return BLOCK_CHANGED; 201 } 202 203 204 /* 205 * Helper function for update_bb_inode() 206 * 207 * Set the block list in the bad block inode, using the supplied bitmap. 208 */ 209 #ifdef __TURBOC__ 210 #pragma argsused 211 #endif 212 static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr, 213 e2_blkcnt_t blockcnt, 214 blk_t ref_block EXT2FS_ATTR((unused)), 215 int ref_offset EXT2FS_ATTR((unused)), 216 void *priv_data) 217 { 218 struct set_badblock_record *rec = (struct set_badblock_record *) 219 priv_data; 220 errcode_t retval; 221 blk_t blk; 222 223 if (blockcnt >= 0) { 224 /* 225 * Get the next bad block. 226 */ 227 if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk)) 228 return BLOCK_ABORT; 229 rec->bad_block_count++; 230 } else { 231 /* 232 * An indirect block; fetch a block from the 233 * previously used indirect block list. The block 234 * most be not marked as used; if so, get another one. 235 * If we run out of reserved indirect blocks, allocate 236 * a new one. 237 */ 238 retry: 239 if (rec->ind_blocks_ptr < rec->ind_blocks_size) { 240 blk = rec->ind_blocks[rec->ind_blocks_ptr++]; 241 if (ext2fs_test_block_bitmap2(fs->block_map, blk)) 242 goto retry; 243 } else { 244 retval = ext2fs_new_block(fs, 0, 0, &blk); 245 if (retval) { 246 rec->err = retval; 247 return BLOCK_ABORT; 248 } 249 } 250 retval = io_channel_write_blk64(fs->io, blk, 1, rec->block_buf); 251 if (retval) { 252 rec->err = retval; 253 return BLOCK_ABORT; 254 } 255 } 256 257 /* 258 * Update block counts 259 */ 260 ext2fs_block_alloc_stats2(fs, blk, +1); 261 262 *block_nr = blk; 263 return BLOCK_CHANGED; 264 } 265 266 267 268 269 270 271
