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0001 /*
0002  * partition.c
0003  *
0004  * PURPOSE
0005  *      Partition handling routines for the OSTA-UDF(tm) filesystem.
0006  *
0007  * COPYRIGHT
0008  *      This file is distributed under the terms of the GNU General Public
0009  *      License (GPL). Copies of the GPL can be obtained from:
0010  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
0011  *      Each contributing author retains all rights to their own work.
0012  *
0013  *  (C) 1998-2001 Ben Fennema
0014  *
0015  * HISTORY
0016  *
0017  * 12/06/98 blf  Created file.
0018  *
0019  */
0020 
0021 #include "udfdecl.h"
0022 #include "udf_sb.h"
0023 #include "udf_i.h"
0024 
0025 #include <linux/fs.h>
0026 #include <linux/string.h>
0027 #include <linux/mutex.h>
0028 
0029 uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
0030             uint16_t partition, uint32_t offset)
0031 {
0032     struct udf_sb_info *sbi = UDF_SB(sb);
0033     struct udf_part_map *map;
0034     if (partition >= sbi->s_partitions) {
0035         udf_debug("block=%u, partition=%u, offset=%u: invalid partition\n",
0036               block, partition, offset);
0037         return 0xFFFFFFFF;
0038     }
0039     map = &sbi->s_partmaps[partition];
0040     if (map->s_partition_func)
0041         return map->s_partition_func(sb, block, partition, offset);
0042     else
0043         return map->s_partition_root + block + offset;
0044 }
0045 
0046 uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
0047                    uint16_t partition, uint32_t offset)
0048 {
0049     struct buffer_head *bh = NULL;
0050     uint32_t newblock;
0051     uint32_t index;
0052     uint32_t loc;
0053     struct udf_sb_info *sbi = UDF_SB(sb);
0054     struct udf_part_map *map;
0055     struct udf_virtual_data *vdata;
0056     struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
0057 
0058     map = &sbi->s_partmaps[partition];
0059     vdata = &map->s_type_specific.s_virtual;
0060 
0061     if (block > vdata->s_num_entries) {
0062         udf_debug("Trying to access block beyond end of VAT (%u max %u)\n",
0063               block, vdata->s_num_entries);
0064         return 0xFFFFFFFF;
0065     }
0066 
0067     if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
0068         loc = le32_to_cpu(((__le32 *)(iinfo->i_data +
0069             vdata->s_start_offset))[block]);
0070         goto translate;
0071     }
0072     index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
0073     if (block >= index) {
0074         block -= index;
0075         newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
0076         index = block % (sb->s_blocksize / sizeof(uint32_t));
0077     } else {
0078         newblock = 0;
0079         index = vdata->s_start_offset / sizeof(uint32_t) + block;
0080     }
0081 
0082     loc = udf_block_map(sbi->s_vat_inode, newblock);
0083 
0084     bh = sb_bread(sb, loc);
0085     if (!bh) {
0086         udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u) VAT: %u[%u]\n",
0087               sb, block, partition, loc, index);
0088         return 0xFFFFFFFF;
0089     }
0090 
0091     loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
0092 
0093     brelse(bh);
0094 
0095 translate:
0096     if (iinfo->i_location.partitionReferenceNum == partition) {
0097         udf_debug("recursive call to udf_get_pblock!\n");
0098         return 0xFFFFFFFF;
0099     }
0100 
0101     return udf_get_pblock(sb, loc,
0102                   iinfo->i_location.partitionReferenceNum,
0103                   offset);
0104 }
0105 
0106 inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
0107                       uint16_t partition, uint32_t offset)
0108 {
0109     return udf_get_pblock_virt15(sb, block, partition, offset);
0110 }
0111 
0112 uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
0113                    uint16_t partition, uint32_t offset)
0114 {
0115     int i;
0116     struct sparingTable *st = NULL;
0117     struct udf_sb_info *sbi = UDF_SB(sb);
0118     struct udf_part_map *map;
0119     uint32_t packet;
0120     struct udf_sparing_data *sdata;
0121 
0122     map = &sbi->s_partmaps[partition];
0123     sdata = &map->s_type_specific.s_sparing;
0124     packet = (block + offset) & ~(sdata->s_packet_len - 1);
0125 
0126     for (i = 0; i < 4; i++) {
0127         if (sdata->s_spar_map[i] != NULL) {
0128             st = (struct sparingTable *)
0129                     sdata->s_spar_map[i]->b_data;
0130             break;
0131         }
0132     }
0133 
0134     if (st) {
0135         for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
0136             struct sparingEntry *entry = &st->mapEntry[i];
0137             u32 origLoc = le32_to_cpu(entry->origLocation);
0138             if (origLoc >= 0xFFFFFFF0)
0139                 break;
0140             else if (origLoc == packet)
0141                 return le32_to_cpu(entry->mappedLocation) +
0142                     ((block + offset) &
0143                         (sdata->s_packet_len - 1));
0144             else if (origLoc > packet)
0145                 break;
0146         }
0147     }
0148 
0149     return map->s_partition_root + block + offset;
0150 }
0151 
0152 int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
0153 {
0154     struct udf_sparing_data *sdata;
0155     struct sparingTable *st = NULL;
0156     struct sparingEntry mapEntry;
0157     uint32_t packet;
0158     int i, j, k, l;
0159     struct udf_sb_info *sbi = UDF_SB(sb);
0160     u16 reallocationTableLen;
0161     struct buffer_head *bh;
0162     int ret = 0;
0163 
0164     mutex_lock(&sbi->s_alloc_mutex);
0165     for (i = 0; i < sbi->s_partitions; i++) {
0166         struct udf_part_map *map = &sbi->s_partmaps[i];
0167         if (old_block > map->s_partition_root &&
0168             old_block < map->s_partition_root + map->s_partition_len) {
0169             sdata = &map->s_type_specific.s_sparing;
0170             packet = (old_block - map->s_partition_root) &
0171                         ~(sdata->s_packet_len - 1);
0172 
0173             for (j = 0; j < 4; j++)
0174                 if (sdata->s_spar_map[j] != NULL) {
0175                     st = (struct sparingTable *)
0176                         sdata->s_spar_map[j]->b_data;
0177                     break;
0178                 }
0179 
0180             if (!st) {
0181                 ret = 1;
0182                 goto out;
0183             }
0184 
0185             reallocationTableLen =
0186                     le16_to_cpu(st->reallocationTableLen);
0187             for (k = 0; k < reallocationTableLen; k++) {
0188                 struct sparingEntry *entry = &st->mapEntry[k];
0189                 u32 origLoc = le32_to_cpu(entry->origLocation);
0190 
0191                 if (origLoc == 0xFFFFFFFF) {
0192                     for (; j < 4; j++) {
0193                         int len;
0194                         bh = sdata->s_spar_map[j];
0195                         if (!bh)
0196                             continue;
0197 
0198                         st = (struct sparingTable *)
0199                                 bh->b_data;
0200                         entry->origLocation =
0201                             cpu_to_le32(packet);
0202                         len =
0203                           sizeof(struct sparingTable) +
0204                           reallocationTableLen *
0205                           sizeof(struct sparingEntry);
0206                         udf_update_tag((char *)st, len);
0207                         mark_buffer_dirty(bh);
0208                     }
0209                     *new_block = le32_to_cpu(
0210                             entry->mappedLocation) +
0211                              ((old_block -
0212                             map->s_partition_root) &
0213                              (sdata->s_packet_len - 1));
0214                     ret = 0;
0215                     goto out;
0216                 } else if (origLoc == packet) {
0217                     *new_block = le32_to_cpu(
0218                             entry->mappedLocation) +
0219                              ((old_block -
0220                             map->s_partition_root) &
0221                              (sdata->s_packet_len - 1));
0222                     ret = 0;
0223                     goto out;
0224                 } else if (origLoc > packet)
0225                     break;
0226             }
0227 
0228             for (l = k; l < reallocationTableLen; l++) {
0229                 struct sparingEntry *entry = &st->mapEntry[l];
0230                 u32 origLoc = le32_to_cpu(entry->origLocation);
0231 
0232                 if (origLoc != 0xFFFFFFFF)
0233                     continue;
0234 
0235                 for (; j < 4; j++) {
0236                     bh = sdata->s_spar_map[j];
0237                     if (!bh)
0238                         continue;
0239 
0240                     st = (struct sparingTable *)bh->b_data;
0241                     mapEntry = st->mapEntry[l];
0242                     mapEntry.origLocation =
0243                             cpu_to_le32(packet);
0244                     memmove(&st->mapEntry[k + 1],
0245                         &st->mapEntry[k],
0246                         (l - k) *
0247                         sizeof(struct sparingEntry));
0248                     st->mapEntry[k] = mapEntry;
0249                     udf_update_tag((char *)st,
0250                         sizeof(struct sparingTable) +
0251                         reallocationTableLen *
0252                         sizeof(struct sparingEntry));
0253                     mark_buffer_dirty(bh);
0254                 }
0255                 *new_block =
0256                     le32_to_cpu(
0257                           st->mapEntry[k].mappedLocation) +
0258                     ((old_block - map->s_partition_root) &
0259                      (sdata->s_packet_len - 1));
0260                 ret = 0;
0261                 goto out;
0262             }
0263 
0264             ret = 1;
0265             goto out;
0266         } /* if old_block */
0267     }
0268 
0269     if (i == sbi->s_partitions) {
0270         /* outside of partitions */
0271         /* for now, fail =) */
0272         ret = 1;
0273     }
0274 
0275 out:
0276     mutex_unlock(&sbi->s_alloc_mutex);
0277     return ret;
0278 }
0279 
0280 static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
0281                     uint16_t partition, uint32_t offset)
0282 {
0283     struct super_block *sb = inode->i_sb;
0284     struct udf_part_map *map;
0285     struct kernel_lb_addr eloc;
0286     uint32_t elen;
0287     sector_t ext_offset;
0288     struct extent_position epos = {};
0289     uint32_t phyblock;
0290 
0291     if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
0292                         (EXT_RECORDED_ALLOCATED >> 30))
0293         phyblock = 0xFFFFFFFF;
0294     else {
0295         map = &UDF_SB(sb)->s_partmaps[partition];
0296         /* map to sparable/physical partition desc */
0297         phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
0298             map->s_type_specific.s_metadata.s_phys_partition_ref,
0299             ext_offset + offset);
0300     }
0301 
0302     brelse(epos.bh);
0303     return phyblock;
0304 }
0305 
0306 uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
0307                 uint16_t partition, uint32_t offset)
0308 {
0309     struct udf_sb_info *sbi = UDF_SB(sb);
0310     struct udf_part_map *map;
0311     struct udf_meta_data *mdata;
0312     uint32_t retblk;
0313     struct inode *inode;
0314 
0315     udf_debug("READING from METADATA\n");
0316 
0317     map = &sbi->s_partmaps[partition];
0318     mdata = &map->s_type_specific.s_metadata;
0319     inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
0320 
0321     if (!inode)
0322         return 0xFFFFFFFF;
0323 
0324     retblk = udf_try_read_meta(inode, block, partition, offset);
0325     if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
0326         udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
0327         if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) {
0328             mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
0329                 mdata->s_mirror_file_loc,
0330                 mdata->s_phys_partition_ref);
0331             if (IS_ERR(mdata->s_mirror_fe))
0332                 mdata->s_mirror_fe = NULL;
0333             mdata->s_flags |= MF_MIRROR_FE_LOADED;
0334         }
0335 
0336         inode = mdata->s_mirror_fe;
0337         if (!inode)
0338             return 0xFFFFFFFF;
0339         retblk = udf_try_read_meta(inode, block, partition, offset);
0340     }
0341 
0342     return retblk;
0343 }
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