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/udf_fs.h> 28 #include <linux/slab.h> 29 #include <linux/buffer_head.h> 30 31 inline uint32_t udf_get_pblock(struct super_block *sb, uint32_t block, 32 uint16_t partition, uint32_t offset) 33 { 34 if (partition >= UDF_SB_NUMPARTS(sb)) { 35 udf_debug("block=%d, partition=%d, offset=%d: invalid partition\n", 36 block, partition, offset); 37 return 0xFFFFFFFF; 38 } 39 if (UDF_SB_PARTFUNC(sb, partition)) 40 return UDF_SB_PARTFUNC(sb, partition)(sb, block, partition, offset); 41 else 42 return UDF_SB_PARTROOT(sb, partition) + block + offset; 43 } 44 45 uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block, 46 uint16_t partition, uint32_t offset) 47 { 48 struct buffer_head *bh = NULL; 49 uint32_t newblock; 50 uint32_t index; 51 uint32_t loc; 52 53 index = (sb->s_blocksize - UDF_SB_TYPEVIRT(sb,partition).s_start_offset) / sizeof(uint32_t); 54 55 if (block > UDF_SB_TYPEVIRT(sb,partition).s_num_entries) { 56 udf_debug("Trying to access block beyond end of VAT (%d max %d)\n", 57 block, UDF_SB_TYPEVIRT(sb,partition).s_num_entries); 58 return 0xFFFFFFFF; 59 } 60 61 if (block >= index) { 62 block -= index; 63 newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t))); 64 index = block % (sb->s_blocksize / sizeof(uint32_t)); 65 } else { 66 newblock = 0; 67 index = UDF_SB_TYPEVIRT(sb,partition).s_start_offset / sizeof(uint32_t) + block; 68 } 69 70 loc = udf_block_map(UDF_SB_VAT(sb), newblock); 71 72 if (!(bh = sb_bread(sb, loc))) { 73 udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n", 74 sb, block, partition, loc, index); 75 return 0xFFFFFFFF; 76 } 77 78 loc = le32_to_cpu(((__le32 *)bh->b_data)[index]); 79 80 brelse(bh); 81 82 if (UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum == partition) { 83 udf_debug("recursive call to udf_get_pblock!\n"); 84 return 0xFFFFFFFF; 85 } 86 87 return udf_get_pblock(sb, loc, 88 UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum, 89 offset); 90 } 91 92 inline uint32_t udf_get_pblock_virt20(struct super_block * sb, uint32_t block, 93 uint16_t partition, uint32_t offset) 94 { 95 return udf_get_pblock_virt15(sb, block, partition, offset); 96 } 97 98 uint32_t udf_get_pblock_spar15(struct super_block * sb, uint32_t block, 99 uint16_t partition, uint32_t offset) 100 { 101 int i; 102 struct sparingTable *st = NULL; 103 uint32_t packet = (block + offset) & ~(UDF_SB_TYPESPAR(sb,partition).s_packet_len - 1); 104 105 for (i = 0; i < 4; i++) { 106 if (UDF_SB_TYPESPAR(sb,partition).s_spar_map[i] != NULL) { 107 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,partition).s_spar_map[i]->b_data; 108 break; 109 } 110 } 111 112 if (st) { 113 for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) { 114 if (le32_to_cpu(st->mapEntry[i].origLocation) >= 0xFFFFFFF0) { 115 break; 116 } else if (le32_to_cpu(st->mapEntry[i].origLocation) == packet) { 117 return le32_to_cpu(st->mapEntry[i].mappedLocation) + 118 ((block + offset) & (UDF_SB_TYPESPAR(sb,partition).s_packet_len - 1)); 119 } else if (le32_to_cpu(st->mapEntry[i].origLocation) > packet) { 120 break; 121 } 122 } 123 } 124 125 return UDF_SB_PARTROOT(sb,partition) + block + offset; 126 } 127 128 int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block) 129 { 130 struct udf_sparing_data *sdata; 131 struct sparingTable *st = NULL; 132 struct sparingEntry mapEntry; 133 uint32_t packet; 134 int i, j, k, l; 135 136 for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) { 137 if (old_block > UDF_SB_PARTROOT(sb,i) && 138 old_block < UDF_SB_PARTROOT(sb,i) + UDF_SB_PARTLEN(sb,i)) { 139 sdata = &UDF_SB_TYPESPAR(sb,i); 140 packet = (old_block - UDF_SB_PARTROOT(sb,i)) & ~(sdata->s_packet_len - 1); 141 142 for (j = 0; j < 4; j++) { 143 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL) { 144 st = (struct sparingTable *)sdata->s_spar_map[j]->b_data; 145 break; 146 } 147 } 148 149 if (!st) 150 return 1; 151 152 for (k = 0; k < le16_to_cpu(st->reallocationTableLen); k++) { 153 if (le32_to_cpu(st->mapEntry[k].origLocation) == 0xFFFFFFFF) { 154 for (; j < 4; j++) { 155 if (sdata->s_spar_map[j]) { 156 st = (struct sparingTable *)sdata->s_spar_map[j]->b_data; 157 st->mapEntry[k].origLocation = cpu_to_le32(packet); 158 udf_update_tag((char *)st, sizeof(struct sparingTable) + le16_to_cpu(st->reallocationTableLen) * sizeof(struct sparingEntry)); 159 mark_buffer_dirty(sdata->s_spar_map[j]); 160 } 161 } 162 *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) + 163 ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1)); 164 return 0; 165 } else if (le32_to_cpu(st->mapEntry[k].origLocation) == packet) { 166 *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) + 167 ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1)); 168 return 0; 169 } else if (le32_to_cpu(st->mapEntry[k].origLocation) > packet) { 170 break; 171 } 172 } 173 174 for (l = k; l < le16_to_cpu(st->reallocationTableLen); l++) { 175 if (le32_to_cpu(st->mapEntry[l].origLocation) == 0xFFFFFFFF) { 176 for (; j < 4; j++) { 177 if (sdata->s_spar_map[j]) { 178 st = (struct sparingTable *)sdata->s_spar_map[j]->b_data; 179 mapEntry = st->mapEntry[l]; 180 mapEntry.origLocation = cpu_to_le32(packet); 181 memmove(&st->mapEntry[k + 1], &st->mapEntry[k], (l - k) * sizeof(struct sparingEntry)); 182 st->mapEntry[k] = mapEntry; 183 udf_update_tag((char *)st, sizeof(struct sparingTable) + le16_to_cpu(st->reallocationTableLen) * sizeof(struct sparingEntry)); 184 mark_buffer_dirty(sdata->s_spar_map[j]); 185 } 186 } 187 *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) + 188 ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1)); 189 return 0; 190 } 191 } 192 193 return 1; 194 } /* if old_block */ 195 } 196 197 if (i == UDF_SB_NUMPARTS(sb)) { 198 /* outside of partitions */ 199 /* for now, fail =) */ 200 return 1; 201 } 202 203 return 0; 204 } 205