325 lines
8.3 KiB
C
325 lines
8.3 KiB
C
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/*
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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/slab.h>
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#include <linux/buffer_head.h>
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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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struct udf_sb_info *sbi = UDF_SB(sb);
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struct udf_part_map *map;
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if (partition >= sbi->s_partitions) {
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udf_debug("block=%d, partition=%d, offset=%d: "
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"invalid partition\n", block, partition, offset);
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return 0xFFFFFFFF;
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}
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map = &sbi->s_partmaps[partition];
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if (map->s_partition_func)
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return map->s_partition_func(sb, block, partition, offset);
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else
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return map->s_partition_root + 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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struct udf_sb_info *sbi = UDF_SB(sb);
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struct udf_part_map *map;
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struct udf_virtual_data *vdata;
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struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
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map = &sbi->s_partmaps[partition];
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vdata = &map->s_type_specific.s_virtual;
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if (block > vdata->s_num_entries) {
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udf_debug("Trying to access block beyond end of VAT "
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"(%d max %d)\n", block, vdata->s_num_entries);
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return 0xFFFFFFFF;
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}
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
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vdata->s_start_offset))[block]);
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goto translate;
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}
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index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
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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 = vdata->s_start_offset / sizeof(uint32_t) + block;
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}
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loc = udf_block_map(sbi->s_vat_inode, newblock);
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bh = sb_bread(sb, loc);
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if (!bh) {
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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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translate:
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if (iinfo->i_location.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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iinfo->i_location.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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struct udf_sb_info *sbi = UDF_SB(sb);
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struct udf_part_map *map;
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uint32_t packet;
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struct udf_sparing_data *sdata;
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map = &sbi->s_partmaps[partition];
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sdata = &map->s_type_specific.s_sparing;
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packet = (block + offset) & ~(sdata->s_packet_len - 1);
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for (i = 0; i < 4; i++) {
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if (sdata->s_spar_map[i] != NULL) {
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st = (struct sparingTable *)
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sdata->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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struct sparingEntry *entry = &st->mapEntry[i];
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u32 origLoc = le32_to_cpu(entry->origLocation);
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if (origLoc >= 0xFFFFFFF0)
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break;
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else if (origLoc == packet)
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return le32_to_cpu(entry->mappedLocation) +
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((block + offset) &
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(sdata->s_packet_len - 1));
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else if (origLoc > packet)
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break;
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}
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}
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return map->s_partition_root + 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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struct udf_sb_info *sbi = UDF_SB(sb);
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u16 reallocationTableLen;
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struct buffer_head *bh;
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for (i = 0; i < sbi->s_partitions; i++) {
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struct udf_part_map *map = &sbi->s_partmaps[i];
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if (old_block > map->s_partition_root &&
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old_block < map->s_partition_root + map->s_partition_len) {
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sdata = &map->s_type_specific.s_sparing;
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packet = (old_block - map->s_partition_root) &
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~(sdata->s_packet_len - 1);
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for (j = 0; j < 4; j++)
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if (sdata->s_spar_map[j] != NULL) {
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st = (struct sparingTable *)
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sdata->s_spar_map[j]->b_data;
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break;
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}
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if (!st)
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return 1;
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reallocationTableLen =
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le16_to_cpu(st->reallocationTableLen);
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for (k = 0; k < reallocationTableLen; k++) {
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struct sparingEntry *entry = &st->mapEntry[k];
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u32 origLoc = le32_to_cpu(entry->origLocation);
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if (origLoc == 0xFFFFFFFF) {
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for (; j < 4; j++) {
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int len;
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bh = sdata->s_spar_map[j];
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if (!bh)
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continue;
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st = (struct sparingTable *)
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bh->b_data;
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entry->origLocation =
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cpu_to_le32(packet);
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len =
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sizeof(struct sparingTable) +
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reallocationTableLen *
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sizeof(struct sparingEntry);
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udf_update_tag((char *)st, len);
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mark_buffer_dirty(bh);
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}
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*new_block = le32_to_cpu(
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entry->mappedLocation) +
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((old_block -
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map->s_partition_root) &
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(sdata->s_packet_len - 1));
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return 0;
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} else if (origLoc == packet) {
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*new_block = le32_to_cpu(
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entry->mappedLocation) +
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((old_block -
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map->s_partition_root) &
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(sdata->s_packet_len - 1));
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return 0;
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} else if (origLoc > packet)
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break;
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}
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for (l = k; l < reallocationTableLen; l++) {
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struct sparingEntry *entry = &st->mapEntry[l];
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u32 origLoc = le32_to_cpu(entry->origLocation);
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if (origLoc != 0xFFFFFFFF)
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continue;
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for (; j < 4; j++) {
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bh = sdata->s_spar_map[j];
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if (!bh)
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continue;
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st = (struct sparingTable *)bh->b_data;
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mapEntry = st->mapEntry[l];
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mapEntry.origLocation =
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cpu_to_le32(packet);
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memmove(&st->mapEntry[k + 1],
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&st->mapEntry[k],
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(l - k) *
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sizeof(struct sparingEntry));
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st->mapEntry[k] = mapEntry;
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udf_update_tag((char *)st,
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sizeof(struct sparingTable) +
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reallocationTableLen *
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sizeof(struct sparingEntry));
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mark_buffer_dirty(bh);
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}
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*new_block =
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le32_to_cpu(
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st->mapEntry[k].mappedLocation) +
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((old_block - map->s_partition_root) &
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(sdata->s_packet_len - 1));
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return 0;
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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 == sbi->s_partitions) {
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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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static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
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uint16_t partition, uint32_t offset)
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{
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struct super_block *sb = inode->i_sb;
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struct udf_part_map *map;
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struct kernel_lb_addr eloc;
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uint32_t elen;
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sector_t ext_offset;
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struct extent_position epos = {};
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uint32_t phyblock;
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if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
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(EXT_RECORDED_ALLOCATED >> 30))
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phyblock = 0xFFFFFFFF;
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else {
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map = &UDF_SB(sb)->s_partmaps[partition];
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/* map to sparable/physical partition desc */
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phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
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map->s_partition_num, ext_offset + offset);
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}
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brelse(epos.bh);
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return phyblock;
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}
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uint32_t udf_get_pblock_meta25(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 udf_sb_info *sbi = UDF_SB(sb);
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struct udf_part_map *map;
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struct udf_meta_data *mdata;
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uint32_t retblk;
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struct inode *inode;
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udf_debug("READING from METADATA\n");
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map = &sbi->s_partmaps[partition];
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mdata = &map->s_type_specific.s_metadata;
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inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
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/* We shouldn't mount such media... */
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BUG_ON(!inode);
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retblk = udf_try_read_meta(inode, block, partition, offset);
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if (retblk == 0xFFFFFFFF) {
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udf_warning(sb, __func__, "error reading from METADATA, "
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"trying to read from MIRROR");
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inode = mdata->s_mirror_fe;
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if (!inode)
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return 0xFFFFFFFF;
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retblk = udf_try_read_meta(inode, block, partition, offset);
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}
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return retblk;
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}
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