1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * partition.c 4 * 5 * PURPOSE 6 * Partition handling routines for the OSTA-UDF(tm) filesystem. 7 * 8 * COPYRIGHT 9 * (C) 1998-2001 Ben Fennema 10 * 11 * HISTORY 12 * 13 * 12/06/98 blf Created file. 14 * 15 */ 16 17 #include "udfdecl.h" 18 #include "udf_sb.h" 19 #include "udf_i.h" 20 21 #include <linux/fs.h> 22 #include <linux/string.h> 23 #include <linux/mutex.h> 24 25 uint32_t udf_get_pblock(struct super_block *sb, uint32_t block, 26 uint16_t partition, uint32_t offset) 27 { 28 struct udf_sb_info *sbi = UDF_SB(sb); 29 struct udf_part_map *map; 30 if (partition >= sbi->s_partitions) { 31 udf_debug("block=%u, partition=%u, offset=%u: invalid partition\n", 32 block, partition, offset); 33 return 0xFFFFFFFF; 34 } 35 map = &sbi->s_partmaps[partition]; 36 if (map->s_partition_func) 37 return map->s_partition_func(sb, block, partition, offset); 38 else 39 return map->s_partition_root + block + offset; 40 } 41 42 uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block, 43 uint16_t partition, uint32_t offset) 44 { 45 struct buffer_head *bh = NULL; 46 uint32_t newblock; 47 uint32_t index; 48 uint32_t loc; 49 struct udf_sb_info *sbi = UDF_SB(sb); 50 struct udf_part_map *map; 51 struct udf_virtual_data *vdata; 52 struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode); 53 int err; 54 55 map = &sbi->s_partmaps[partition]; 56 vdata = &map->s_type_specific.s_virtual; 57 58 if (block > vdata->s_num_entries) { 59 udf_debug("Trying to access block beyond end of VAT (%u max %u)\n", 60 block, vdata->s_num_entries); 61 return 0xFFFFFFFF; 62 } 63 64 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 65 loc = le32_to_cpu(((__le32 *)(iinfo->i_data + 66 vdata->s_start_offset))[block]); 67 goto translate; 68 } 69 index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t); 70 if (block >= index) { 71 block -= index; 72 newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t))); 73 index = block % (sb->s_blocksize / sizeof(uint32_t)); 74 } else { 75 newblock = 0; 76 index = vdata->s_start_offset / sizeof(uint32_t) + block; 77 } 78 79 bh = udf_bread(sbi->s_vat_inode, newblock, 0, &err); 80 if (!bh) { 81 udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u)\n", 82 sb, block, partition); 83 return 0xFFFFFFFF; 84 } 85 86 loc = le32_to_cpu(((__le32 *)bh->b_data)[index]); 87 88 brelse(bh); 89 90 translate: 91 if (iinfo->i_location.partitionReferenceNum == partition) { 92 udf_debug("recursive call to udf_get_pblock!\n"); 93 return 0xFFFFFFFF; 94 } 95 96 return udf_get_pblock(sb, loc, 97 iinfo->i_location.partitionReferenceNum, 98 offset); 99 } 100 101 inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block, 102 uint16_t partition, uint32_t offset) 103 { 104 return udf_get_pblock_virt15(sb, block, partition, offset); 105 } 106 107 uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block, 108 uint16_t partition, uint32_t offset) 109 { 110 int i; 111 struct sparingTable *st = NULL; 112 struct udf_sb_info *sbi = UDF_SB(sb); 113 struct udf_part_map *map; 114 uint32_t packet; 115 struct udf_sparing_data *sdata; 116 117 map = &sbi->s_partmaps[partition]; 118 sdata = &map->s_type_specific.s_sparing; 119 packet = (block + offset) & ~(sdata->s_packet_len - 1); 120 121 for (i = 0; i < 4; i++) { 122 if (sdata->s_spar_map[i] != NULL) { 123 st = (struct sparingTable *) 124 sdata->s_spar_map[i]->b_data; 125 break; 126 } 127 } 128 129 if (st) { 130 for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) { 131 struct sparingEntry *entry = &st->mapEntry[i]; 132 u32 origLoc = le32_to_cpu(entry->origLocation); 133 if (origLoc >= 0xFFFFFFF0) 134 break; 135 else if (origLoc == packet) 136 return le32_to_cpu(entry->mappedLocation) + 137 ((block + offset) & 138 (sdata->s_packet_len - 1)); 139 else if (origLoc > packet) 140 break; 141 } 142 } 143 144 return map->s_partition_root + block + offset; 145 } 146 147 int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block) 148 { 149 struct udf_sparing_data *sdata; 150 struct sparingTable *st = NULL; 151 struct sparingEntry mapEntry; 152 uint32_t packet; 153 int i, j, k, l; 154 struct udf_sb_info *sbi = UDF_SB(sb); 155 u16 reallocationTableLen; 156 struct buffer_head *bh; 157 int ret = 0; 158 159 mutex_lock(&sbi->s_alloc_mutex); 160 for (i = 0; i < sbi->s_partitions; i++) { 161 struct udf_part_map *map = &sbi->s_partmaps[i]; 162 if (old_block > map->s_partition_root && 163 old_block < map->s_partition_root + map->s_partition_len) { 164 sdata = &map->s_type_specific.s_sparing; 165 packet = (old_block - map->s_partition_root) & 166 ~(sdata->s_packet_len - 1); 167 168 for (j = 0; j < 4; j++) 169 if (sdata->s_spar_map[j] != NULL) { 170 st = (struct sparingTable *) 171 sdata->s_spar_map[j]->b_data; 172 break; 173 } 174 175 if (!st) { 176 ret = 1; 177 goto out; 178 } 179 180 reallocationTableLen = 181 le16_to_cpu(st->reallocationTableLen); 182 for (k = 0; k < reallocationTableLen; k++) { 183 struct sparingEntry *entry = &st->mapEntry[k]; 184 u32 origLoc = le32_to_cpu(entry->origLocation); 185 186 if (origLoc == 0xFFFFFFFF) { 187 for (; j < 4; j++) { 188 int len; 189 bh = sdata->s_spar_map[j]; 190 if (!bh) 191 continue; 192 193 st = (struct sparingTable *) 194 bh->b_data; 195 entry->origLocation = 196 cpu_to_le32(packet); 197 len = 198 sizeof(struct sparingTable) + 199 reallocationTableLen * 200 sizeof(struct sparingEntry); 201 udf_update_tag((char *)st, len); 202 mark_buffer_dirty(bh); 203 } 204 *new_block = le32_to_cpu( 205 entry->mappedLocation) + 206 ((old_block - 207 map->s_partition_root) & 208 (sdata->s_packet_len - 1)); 209 ret = 0; 210 goto out; 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 ret = 0; 218 goto out; 219 } else if (origLoc > packet) 220 break; 221 } 222 223 for (l = k; l < reallocationTableLen; l++) { 224 struct sparingEntry *entry = &st->mapEntry[l]; 225 u32 origLoc = le32_to_cpu(entry->origLocation); 226 227 if (origLoc != 0xFFFFFFFF) 228 continue; 229 230 for (; j < 4; j++) { 231 bh = sdata->s_spar_map[j]; 232 if (!bh) 233 continue; 234 235 st = (struct sparingTable *)bh->b_data; 236 mapEntry = st->mapEntry[l]; 237 mapEntry.origLocation = 238 cpu_to_le32(packet); 239 memmove(&st->mapEntry[k + 1], 240 &st->mapEntry[k], 241 (l - k) * 242 sizeof(struct sparingEntry)); 243 st->mapEntry[k] = mapEntry; 244 udf_update_tag((char *)st, 245 sizeof(struct sparingTable) + 246 reallocationTableLen * 247 sizeof(struct sparingEntry)); 248 mark_buffer_dirty(bh); 249 } 250 *new_block = 251 le32_to_cpu( 252 st->mapEntry[k].mappedLocation) + 253 ((old_block - map->s_partition_root) & 254 (sdata->s_packet_len - 1)); 255 ret = 0; 256 goto out; 257 } 258 259 ret = 1; 260 goto out; 261 } /* if old_block */ 262 } 263 264 if (i == sbi->s_partitions) { 265 /* outside of partitions */ 266 /* for now, fail =) */ 267 ret = 1; 268 } 269 270 out: 271 mutex_unlock(&sbi->s_alloc_mutex); 272 return ret; 273 } 274 275 static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block, 276 uint16_t partition, uint32_t offset) 277 { 278 struct super_block *sb = inode->i_sb; 279 struct udf_part_map *map; 280 struct kernel_lb_addr eloc; 281 uint32_t elen; 282 sector_t ext_offset; 283 struct extent_position epos = {}; 284 uint32_t phyblock; 285 int8_t etype; 286 int err = 0; 287 288 err = inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset, &etype); 289 if (err <= 0 || etype != (EXT_RECORDED_ALLOCATED >> 30)) 290 phyblock = 0xFFFFFFFF; 291 else { 292 map = &UDF_SB(sb)->s_partmaps[partition]; 293 /* map to sparable/physical partition desc */ 294 phyblock = udf_get_pblock(sb, eloc.logicalBlockNum, 295 map->s_type_specific.s_metadata.s_phys_partition_ref, 296 ext_offset + offset); 297 } 298 299 brelse(epos.bh); 300 return phyblock; 301 } 302 303 uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block, 304 uint16_t partition, uint32_t offset) 305 { 306 struct udf_sb_info *sbi = UDF_SB(sb); 307 struct udf_part_map *map; 308 struct udf_meta_data *mdata; 309 uint32_t retblk; 310 struct inode *inode; 311 312 udf_debug("READING from METADATA\n"); 313 314 map = &sbi->s_partmaps[partition]; 315 mdata = &map->s_type_specific.s_metadata; 316 inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe; 317 318 if (!inode) 319 return 0xFFFFFFFF; 320 321 retblk = udf_try_read_meta(inode, block, partition, offset); 322 if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) { 323 udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n"); 324 if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) { 325 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb, 326 mdata->s_mirror_file_loc, 327 mdata->s_phys_partition_ref); 328 if (IS_ERR(mdata->s_mirror_fe)) 329 mdata->s_mirror_fe = NULL; 330 mdata->s_flags |= MF_MIRROR_FE_LOADED; 331 } 332 333 inode = mdata->s_mirror_fe; 334 if (!inode) 335 return 0xFFFFFFFF; 336 retblk = udf_try_read_meta(inode, block, partition, offset); 337 } 338 339 return retblk; 340 } 341