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 <stdio.h> 17 #include <string.h> 18 #if HAVE_UNISTD_H 19 #include <unistd.h> 20 #endif 21 #include <fcntl.h> 22 #include <time.h> 23 #if HAVE_SYS_STAT_H 24 #include <sys/stat.h> 25 #endif 26 #if HAVE_SYS_TYPES_H 27 #include <sys/types.h> 28 #endif 29 30 #include "ext2_fs.h" 31 #include "ext2fs.h" 32 33 struct set_badblock_record { 34 ext2_badblocks_iterate bb_iter; 35 int bad_block_count; 36 blk_t *ind_blocks; 37 int max_ind_blocks; 38 int ind_blocks_size; 39 int ind_blocks_ptr; 40 char *block_buf; 41 errcode_t err; 42 }; 43 44 static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr, 45 e2_blkcnt_t blockcnt, 46 blk_t ref_block, int ref_offset, 47 void *priv_data); 48 static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr, 49 e2_blkcnt_t blockcnt, 50 blk_t ref_block, int ref_offset, 51 void *priv_data); 52 53 /* 54 * Given a bad blocks bitmap, update the bad blocks inode to reflect 55 * the map. 56 */ 57 errcode_t ext2fs_update_bb_inode(ext2_filsys fs, ext2_badblocks_list bb_list) 58 { 59 errcode_t retval; 60 struct set_badblock_record rec; 61 struct ext2_inode inode; 62 63 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 64 65 if (!fs->block_map) 66 return EXT2_ET_NO_BLOCK_BITMAP; 67 68 rec.bad_block_count = 0; 69 rec.ind_blocks_size = rec.ind_blocks_ptr = 0; 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 inode.i_size = rec.bad_block_count * fs->blocksize; 132 133 retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode); 134 if (retval) 135 goto cleanup; 136 137 cleanup: 138 ext2fs_free_mem(&rec.ind_blocks); 139 ext2fs_free_mem(&rec.block_buf); 140 return retval; 141 } 142 143 /* 144 * Helper function for update_bb_inode() 145 * 146 * Clear the bad blocks in the bad block inode, while saving the 147 * indirect blocks. 148 */ 149 #ifdef __TURBOC__ 150 #pragma argsused 151 #endif 152 static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr, 153 e2_blkcnt_t blockcnt, 154 blk_t ref_block EXT2FS_ATTR((unused)), 155 int ref_offset EXT2FS_ATTR((unused)), 156 void *priv_data) 157 { 158 struct set_badblock_record *rec = (struct set_badblock_record *) 159 priv_data; 160 errcode_t retval; 161 unsigned long old_size; 162 163 if (!*block_nr) 164 return 0; 165 166 /* 167 * If the block number is outrageous, clear it and ignore it. 168 */ 169 if (*block_nr >= fs->super->s_blocks_count || 170 *block_nr < fs->super->s_first_data_block) { 171 *block_nr = 0; 172 return BLOCK_CHANGED; 173 } 174 175 if (blockcnt < 0) { 176 if (rec->ind_blocks_size >= rec->max_ind_blocks) { 177 old_size = rec->max_ind_blocks * sizeof(blk_t); 178 rec->max_ind_blocks += 10; 179 retval = ext2fs_resize_mem(old_size, 180 rec->max_ind_blocks * sizeof(blk_t), 181 &rec->ind_blocks); 182 if (retval) { 183 rec->max_ind_blocks -= 10; 184 rec->err = retval; 185 return BLOCK_ABORT; 186 } 187 } 188 rec->ind_blocks[rec->ind_blocks_size++] = *block_nr; 189 } 190 191 /* 192 * Mark the block as unused, and update accounting information 193 */ 194 ext2fs_block_alloc_stats(fs, *block_nr, -1); 195 196 *block_nr = 0; 197 return BLOCK_CHANGED; 198 } 199 200 201 /* 202 * Helper function for update_bb_inode() 203 * 204 * Set the block list in the bad block inode, using the supplied bitmap. 205 */ 206 #ifdef __TURBOC__ 207 #pragma argsused 208 #endif 209 static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr, 210 e2_blkcnt_t blockcnt, 211 blk_t ref_block EXT2FS_ATTR((unused)), 212 int ref_offset EXT2FS_ATTR((unused)), 213 void *priv_data) 214 { 215 struct set_badblock_record *rec = (struct set_badblock_record *) 216 priv_data; 217 errcode_t retval; 218 blk_t blk; 219 220 if (blockcnt >= 0) { 221 /* 222 * Get the next bad block. 223 */ 224 if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk)) 225 return BLOCK_ABORT; 226 rec->bad_block_count++; 227 } else { 228 /* 229 * An indirect block; fetch a block from the 230 * previously used indirect block list. The block 231 * most be not marked as used; if so, get another one. 232 * If we run out of reserved indirect blocks, allocate 233 * a new one. 234 */ 235 retry: 236 if (rec->ind_blocks_ptr < rec->ind_blocks_size) { 237 blk = rec->ind_blocks[rec->ind_blocks_ptr++]; 238 if (ext2fs_test_block_bitmap(fs->block_map, blk)) 239 goto retry; 240 } else { 241 retval = ext2fs_new_block(fs, 0, 0, &blk); 242 if (retval) { 243 rec->err = retval; 244 return BLOCK_ABORT; 245 } 246 } 247 retval = io_channel_write_blk(fs->io, blk, 1, rec->block_buf); 248 if (retval) { 249 rec->err = retval; 250 return BLOCK_ABORT; 251 } 252 } 253 254 /* 255 * Update block counts 256 */ 257 ext2fs_block_alloc_stats(fs, blk, +1); 258 259 *block_nr = blk; 260 return BLOCK_CHANGED; 261 } 262 263 264 265 266 267 268
