205 строки
6.1 KiB
C
205 строки
6.1 KiB
C
/*
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* partition.c
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*
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* PURPOSE
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* Partition handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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* (C) 1998-2001 Ben Fennema
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*
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* HISTORY
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*
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* 12/06/98 blf Created file.
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*
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*/
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#include "udfdecl.h"
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#include "udf_sb.h"
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#include "udf_i.h"
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/udf_fs.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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inline uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
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uint16_t partition, uint32_t offset)
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{
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if (partition >= UDF_SB_NUMPARTS(sb)) {
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udf_debug("block=%d, partition=%d, offset=%d: invalid partition\n",
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block, partition, offset);
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return 0xFFFFFFFF;
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}
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if (UDF_SB_PARTFUNC(sb, partition))
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return UDF_SB_PARTFUNC(sb, partition)(sb, block, partition, offset);
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else
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return UDF_SB_PARTROOT(sb, partition) + block + offset;
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}
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uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
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uint16_t partition, uint32_t offset)
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{
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struct buffer_head *bh = NULL;
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uint32_t newblock;
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uint32_t index;
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uint32_t loc;
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index = (sb->s_blocksize - UDF_SB_TYPEVIRT(sb,partition).s_start_offset) / sizeof(uint32_t);
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if (block > UDF_SB_TYPEVIRT(sb,partition).s_num_entries) {
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udf_debug("Trying to access block beyond end of VAT (%d max %d)\n",
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block, UDF_SB_TYPEVIRT(sb,partition).s_num_entries);
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return 0xFFFFFFFF;
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}
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if (block >= index) {
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block -= index;
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newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
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index = block % (sb->s_blocksize / sizeof(uint32_t));
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} else {
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newblock = 0;
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index = UDF_SB_TYPEVIRT(sb,partition).s_start_offset / sizeof(uint32_t) + block;
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}
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loc = udf_block_map(UDF_SB_VAT(sb), newblock);
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if (!(bh = sb_bread(sb, loc))) {
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udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n",
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sb, block, partition, loc, index);
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return 0xFFFFFFFF;
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}
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loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
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brelse(bh);
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if (UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum == partition) {
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udf_debug("recursive call to udf_get_pblock!\n");
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return 0xFFFFFFFF;
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}
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return udf_get_pblock(sb, loc,
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UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum,
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offset);
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}
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inline uint32_t udf_get_pblock_virt20(struct super_block * sb, uint32_t block,
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uint16_t partition, uint32_t offset)
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{
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return udf_get_pblock_virt15(sb, block, partition, offset);
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}
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uint32_t udf_get_pblock_spar15(struct super_block * sb, uint32_t block,
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uint16_t partition, uint32_t offset)
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{
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int i;
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struct sparingTable *st = NULL;
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uint32_t packet = (block + offset) & ~(UDF_SB_TYPESPAR(sb,partition).s_packet_len - 1);
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for (i = 0; i < 4; i++) {
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if (UDF_SB_TYPESPAR(sb,partition).s_spar_map[i] != NULL) {
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st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,partition).s_spar_map[i]->b_data;
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break;
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}
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}
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if (st) {
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for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
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if (le32_to_cpu(st->mapEntry[i].origLocation) >= 0xFFFFFFF0) {
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break;
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} else if (le32_to_cpu(st->mapEntry[i].origLocation) == packet) {
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return le32_to_cpu(st->mapEntry[i].mappedLocation) +
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((block + offset) & (UDF_SB_TYPESPAR(sb,partition).s_packet_len - 1));
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} else if (le32_to_cpu(st->mapEntry[i].origLocation) > packet) {
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break;
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}
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}
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}
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return UDF_SB_PARTROOT(sb,partition) + block + offset;
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}
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int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
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{
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struct udf_sparing_data *sdata;
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struct sparingTable *st = NULL;
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struct sparingEntry mapEntry;
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uint32_t packet;
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int i, j, k, l;
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for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
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if (old_block > UDF_SB_PARTROOT(sb,i) &&
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old_block < UDF_SB_PARTROOT(sb,i) + UDF_SB_PARTLEN(sb,i)) {
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sdata = &UDF_SB_TYPESPAR(sb,i);
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packet = (old_block - UDF_SB_PARTROOT(sb,i)) & ~(sdata->s_packet_len - 1);
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for (j = 0; j < 4; j++) {
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if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL) {
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st = (struct sparingTable *)sdata->s_spar_map[j]->b_data;
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break;
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}
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}
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if (!st)
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return 1;
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for (k = 0; k < le16_to_cpu(st->reallocationTableLen); k++) {
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if (le32_to_cpu(st->mapEntry[k].origLocation) == 0xFFFFFFFF) {
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for (; j < 4; j++) {
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if (sdata->s_spar_map[j]) {
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st = (struct sparingTable *)sdata->s_spar_map[j]->b_data;
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st->mapEntry[k].origLocation = cpu_to_le32(packet);
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udf_update_tag((char *)st, sizeof(struct sparingTable) + le16_to_cpu(st->reallocationTableLen) * sizeof(struct sparingEntry));
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mark_buffer_dirty(sdata->s_spar_map[j]);
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}
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}
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*new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) +
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((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1));
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return 0;
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} else if (le32_to_cpu(st->mapEntry[k].origLocation) == packet) {
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*new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) +
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((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1));
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return 0;
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} else if (le32_to_cpu(st->mapEntry[k].origLocation) > packet) {
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break;
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}
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}
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for (l = k; l < le16_to_cpu(st->reallocationTableLen); l++) {
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if (le32_to_cpu(st->mapEntry[l].origLocation) == 0xFFFFFFFF) {
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for (; j < 4; j++) {
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if (sdata->s_spar_map[j]) {
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st = (struct sparingTable *)sdata->s_spar_map[j]->b_data;
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mapEntry = st->mapEntry[l];
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mapEntry.origLocation = cpu_to_le32(packet);
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memmove(&st->mapEntry[k + 1], &st->mapEntry[k], (l - k) * sizeof(struct sparingEntry));
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st->mapEntry[k] = mapEntry;
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udf_update_tag((char *)st, sizeof(struct sparingTable) + le16_to_cpu(st->reallocationTableLen) * sizeof(struct sparingEntry));
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mark_buffer_dirty(sdata->s_spar_map[j]);
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}
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}
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*new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) +
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((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1));
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return 0;
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}
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}
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return 1;
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} /* if old_block */
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}
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if (i == UDF_SB_NUMPARTS(sb)) {
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/* outside of partitions */
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/* for now, fail =) */
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return 1;
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}
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return 0;
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}
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