341 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * partition.c4 *5 * PURPOSE6 * Partition handling routines for the OSTA-UDF(tm) filesystem.7 *8 * COPYRIGHT9 * (C) 1998-2001 Ben Fennema10 *11 * HISTORY12 *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 25uint32_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 else39 return map->s_partition_root + block + offset;40}41 42uint32_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 90translate: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 101inline 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 107uint32_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 147int 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 270out:271 mutex_unlock(&sbi->s_alloc_mutex);272 return ret;273}274 275static 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 303uint32_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