1 /* 2 * partition.c 3 * 4 * PURPOSE 5 * Partition handling routines for the OSTA-UDF(tm) filesystem. 6 * 7 * COPYRIGHT 8 * This file is distributed under the terms of the GNU General Public 9 * License (GPL). Copies of the GPL can be obtained from: 10 * ftp://prep.ai.mit.edu/pub/gnu/GPL 11 * Each contributing author retains all rights to their own work. 12 * 13 * (C) 1998-2001 Ben Fennema 14 * 15 * HISTORY 16 * 17 * 12/06/98 blf Created file. 18 * 19 */ 20 21 #include "udfdecl.h" 22 #include "udf_sb.h" 23 #include "udf_i.h" 24 25 #include <linux/fs.h> 26 #include <linux/string.h> 27 #include <linux/buffer_head.h> 28 29 uint32_t udf_get_pblock(struct super_block *sb, uint32_t block, 30 uint16_t partition, uint32_t offset) 31 { 32 struct udf_sb_info *sbi = UDF_SB(sb); 33 struct udf_part_map *map; 34 if (partition >= sbi->s_partitions) { 35 udf_debug("block=%d, partition=%d, offset=%d: " 36 "invalid partition\n", block, partition, offset); 37 return 0xFFFFFFFF; 38 } 39 map = &sbi->s_partmaps[partition]; 40 if (map->s_partition_func) 41 return map->s_partition_func(sb, block, partition, offset); 42 else 43 return map->s_partition_root + block + offset; 44 } 45 46 uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block, 47 uint16_t partition, uint32_t offset) 48 { 49 struct buffer_head *bh = NULL; 50 uint32_t newblock; 51 uint32_t index; 52 uint32_t loc; 53 struct udf_sb_info *sbi = UDF_SB(sb); 54 struct udf_part_map *map; 55 struct udf_virtual_data *vdata; 56 struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode); 57 58 map = &sbi->s_partmaps[partition]; 59 vdata = &map->s_type_specific.s_virtual; 60 61 if (block > vdata->s_num_entries) { 62 udf_debug("Trying to access block beyond end of VAT " 63 "(%d max %d)\n", block, vdata->s_num_entries); 64 return 0xFFFFFFFF; 65 } 66 67 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 68 loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data + 69 vdata->s_start_offset))[block]); 70 goto translate; 71 } 72 index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t); 73 if (block >= index) { 74 block -= index; 75 newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t))); 76 index = block % (sb->s_blocksize / sizeof(uint32_t)); 77 } else { 78 newblock = 0; 79 index = vdata->s_start_offset / sizeof(uint32_t) + block; 80 } 81 82 loc = udf_block_map(sbi->s_vat_inode, newblock); 83 84 bh = sb_bread(sb, loc); 85 if (!bh) { 86 udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n", 87 sb, block, partition, loc, index); 88 return 0xFFFFFFFF; 89 } 90 91 loc = le32_to_cpu(((__le32 *)bh->b_data)[index]); 92 93 brelse(bh); 94 95 translate: 96 if (iinfo->i_location.partitionReferenceNum == partition) { 97 udf_debug("recursive call to udf_get_pblock!\n"); 98 return 0xFFFFFFFF; 99 } 100 101 return udf_get_pblock(sb, loc, 102 iinfo->i_location.partitionReferenceNum, 103 offset); 104 } 105 106 inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block, 107 uint16_t partition, uint32_t offset) 108 { 109 return udf_get_pblock_virt15(sb, block, partition, offset); 110 } 111 112 uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block, 113 uint16_t partition, uint32_t offset) 114 { 115 int i; 116 struct sparingTable *st = NULL; 117 struct udf_sb_info *sbi = UDF_SB(sb); 118 struct udf_part_map *map; 119 uint32_t packet; 120 struct udf_sparing_data *sdata; 121 122 map = &sbi->s_partmaps[partition]; 123 sdata = &map->s_type_specific.s_sparing; 124 packet = (block + offset) & ~(sdata->s_packet_len - 1); 125 126 for (i = 0; i < 4; i++) { 127 if (sdata->s_spar_map[i] != NULL) { 128 st = (struct sparingTable *) 129 sdata->s_spar_map[i]->b_data; 130 break; 131 } 132 } 133 134 if (st) { 135 for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) { 136 struct sparingEntry *entry = &st->mapEntry[i]; 137 u32 origLoc = le32_to_cpu(entry->origLocation); 138 if (origLoc >= 0xFFFFFFF0) 139 break; 140 else if (origLoc == packet) 141 return le32_to_cpu(entry->mappedLocation) + 142 ((block + offset) & 143 (sdata->s_packet_len - 1)); 144 else if (origLoc > packet) 145 break; 146 } 147 } 148 149 return map->s_partition_root + block + offset; 150 } 151 152 int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block) 153 { 154 struct udf_sparing_data *sdata; 155 struct sparingTable *st = NULL; 156 struct sparingEntry mapEntry; 157 uint32_t packet; 158 int i, j, k, l; 159 struct udf_sb_info *sbi = UDF_SB(sb); 160 u16 reallocationTableLen; 161 struct buffer_head *bh; 162 163 for (i = 0; i < sbi->s_partitions; i++) { 164 struct udf_part_map *map = &sbi->s_partmaps[i]; 165 if (old_block > map->s_partition_root && 166 old_block < map->s_partition_root + map->s_partition_len) { 167 sdata = &map->s_type_specific.s_sparing; 168 packet = (old_block - map->s_partition_root) & 169 ~(sdata->s_packet_len - 1); 170 171 for (j = 0; j < 4; j++) 172 if (sdata->s_spar_map[j] != NULL) { 173 st = (struct sparingTable *) 174 sdata->s_spar_map[j]->b_data; 175 break; 176 } 177 178 if (!st) 179 return 1; 180 181 reallocationTableLen = 182 le16_to_cpu(st->reallocationTableLen); 183 for (k = 0; k < reallocationTableLen; k++) { 184 struct sparingEntry *entry = &st->mapEntry[k]; 185 u32 origLoc = le32_to_cpu(entry->origLocation); 186 187 if (origLoc == 0xFFFFFFFF) { 188 for (; j < 4; j++) { 189 int len; 190 bh = sdata->s_spar_map[j]; 191 if (!bh) 192 continue; 193 194 st = (struct sparingTable *) 195 bh->b_data; 196 entry->origLocation = 197 cpu_to_le32(packet); 198 len = 199 sizeof(struct sparingTable) + 200 reallocationTableLen * 201 sizeof(struct sparingEntry); 202 udf_update_tag((char *)st, len); 203 mark_buffer_dirty(bh); 204 } 205 *new_block = le32_to_cpu( 206 entry->mappedLocation) + 207 ((old_block - 208 map->s_partition_root) & 209 (sdata->s_packet_len - 1)); 210 return 0; 211 } else if (origLoc == packet) { 212 *new_block = le32_to_cpu( 213 entry->mappedLocation) + 214 ((old_block - 215 map->s_partition_root) & 216 (sdata->s_packet_len - 1)); 217 return 0; 218 } else if (origLoc > packet) 219 break; 220 } 221 222 for (l = k; l < reallocationTableLen; l++) { 223 struct sparingEntry *entry = &st->mapEntry[l]; 224 u32 origLoc = le32_to_cpu(entry->origLocation); 225 226 if (origLoc != 0xFFFFFFFF) 227 continue; 228 229 for (; j < 4; j++) { 230 bh = sdata->s_spar_map[j]; 231 if (!bh) 232 continue; 233 234 st = (struct sparingTable *)bh->b_data; 235 mapEntry = st->mapEntry[l]; 236 mapEntry.origLocation = 237 cpu_to_le32(packet); 238 memmove(&st->mapEntry[k + 1], 239 &st->mapEntry[k], 240 (l - k) * 241 sizeof(struct sparingEntry)); 242 st->mapEntry[k] = mapEntry; 243 udf_update_tag((char *)st, 244 sizeof(struct sparingTable) + 245 reallocationTableLen * 246 sizeof(struct sparingEntry)); 247 mark_buffer_dirty(bh); 248 } 249 *new_block = 250 le32_to_cpu( 251 st->mapEntry[k].mappedLocation) + 252 ((old_block - map->s_partition_root) & 253 (sdata->s_packet_len - 1)); 254 return 0; 255 } 256 257 return 1; 258 } /* if old_block */ 259 } 260 261 if (i == sbi->s_partitions) { 262 /* outside of partitions */ 263 /* for now, fail =) */ 264 return 1; 265 } 266 267 return 0; 268 } 269 270 static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block, 271 uint16_t partition, uint32_t offset) 272 { 273 struct super_block *sb = inode->i_sb; 274 struct udf_part_map *map; 275 struct kernel_lb_addr eloc; 276 uint32_t elen; 277 sector_t ext_offset; 278 struct extent_position epos = {}; 279 uint32_t phyblock; 280 281 if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) != 282 (EXT_RECORDED_ALLOCATED >> 30)) 283 phyblock = 0xFFFFFFFF; 284 else { 285 map = &UDF_SB(sb)->s_partmaps[partition]; 286 /* map to sparable/physical partition desc */ 287 phyblock = udf_get_pblock(sb, eloc.logicalBlockNum, 288 map->s_partition_num, ext_offset + offset); 289 } 290 291 brelse(epos.bh); 292 return phyblock; 293 } 294 295 uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block, 296 uint16_t partition, uint32_t offset) 297 { 298 struct udf_sb_info *sbi = UDF_SB(sb); 299 struct udf_part_map *map; 300 struct udf_meta_data *mdata; 301 uint32_t retblk; 302 struct inode *inode; 303 304 udf_debug("READING from METADATA\n"); 305 306 map = &sbi->s_partmaps[partition]; 307 mdata = &map->s_type_specific.s_metadata; 308 inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe; 309 310 /* We shouldn't mount such media... */ 311 BUG_ON(!inode); 312 retblk = udf_try_read_meta(inode, block, partition, offset); 313 if (retblk == 0xFFFFFFFF) { 314 udf_warning(sb, __func__, "error reading from METADATA, " 315 "trying to read from MIRROR"); 316 inode = mdata->s_mirror_fe; 317 if (!inode) 318 return 0xFFFFFFFF; 319 retblk = udf_try_read_meta(inode, block, partition, offset); 320 } 321 322 return retblk; 323 } 324