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-rw-r--r--fs/udf/partition.c338
1 files changed, 338 insertions, 0 deletions
diff --git a/fs/udf/partition.c b/fs/udf/partition.c
new file mode 100644
index 000000000..5f861ed28
--- /dev/null
+++ b/fs/udf/partition.c
@@ -0,0 +1,338 @@
+/*
+ * partition.c
+ *
+ * PURPOSE
+ * Partition handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * COPYRIGHT
+ * This file is distributed under the terms of the GNU General Public
+ * License (GPL). Copies of the GPL can be obtained from:
+ * ftp://prep.ai.mit.edu/pub/gnu/GPL
+ * Each contributing author retains all rights to their own work.
+ *
+ * (C) 1998-2001 Ben Fennema
+ *
+ * HISTORY
+ *
+ * 12/06/98 blf Created file.
+ *
+ */
+
+#include "udfdecl.h"
+#include "udf_sb.h"
+#include "udf_i.h"
+
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/mutex.h>
+
+uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
+ uint16_t partition, uint32_t offset)
+{
+ struct udf_sb_info *sbi = UDF_SB(sb);
+ struct udf_part_map *map;
+ if (partition >= sbi->s_partitions) {
+ udf_debug("block=%d, partition=%d, offset=%d: invalid partition\n",
+ block, partition, offset);
+ return 0xFFFFFFFF;
+ }
+ map = &sbi->s_partmaps[partition];
+ if (map->s_partition_func)
+ return map->s_partition_func(sb, block, partition, offset);
+ else
+ return map->s_partition_root + block + offset;
+}
+
+uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
+ uint16_t partition, uint32_t offset)
+{
+ struct buffer_head *bh = NULL;
+ uint32_t newblock;
+ uint32_t index;
+ uint32_t loc;
+ struct udf_sb_info *sbi = UDF_SB(sb);
+ struct udf_part_map *map;
+ struct udf_virtual_data *vdata;
+ struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
+
+ map = &sbi->s_partmaps[partition];
+ vdata = &map->s_type_specific.s_virtual;
+
+ if (block > vdata->s_num_entries) {
+ udf_debug("Trying to access block beyond end of VAT (%d max %d)\n",
+ block, vdata->s_num_entries);
+ return 0xFFFFFFFF;
+ }
+
+ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
+ vdata->s_start_offset))[block]);
+ goto translate;
+ }
+ index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
+ if (block >= index) {
+ block -= index;
+ newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
+ index = block % (sb->s_blocksize / sizeof(uint32_t));
+ } else {
+ newblock = 0;
+ index = vdata->s_start_offset / sizeof(uint32_t) + block;
+ }
+
+ loc = udf_block_map(sbi->s_vat_inode, newblock);
+
+ bh = sb_bread(sb, loc);
+ if (!bh) {
+ udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n",
+ sb, block, partition, loc, index);
+ return 0xFFFFFFFF;
+ }
+
+ loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
+
+ brelse(bh);
+
+translate:
+ if (iinfo->i_location.partitionReferenceNum == partition) {
+ udf_debug("recursive call to udf_get_pblock!\n");
+ return 0xFFFFFFFF;
+ }
+
+ return udf_get_pblock(sb, loc,
+ iinfo->i_location.partitionReferenceNum,
+ offset);
+}
+
+inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
+ uint16_t partition, uint32_t offset)
+{
+ return udf_get_pblock_virt15(sb, block, partition, offset);
+}
+
+uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
+ uint16_t partition, uint32_t offset)
+{
+ int i;
+ struct sparingTable *st = NULL;
+ struct udf_sb_info *sbi = UDF_SB(sb);
+ struct udf_part_map *map;
+ uint32_t packet;
+ struct udf_sparing_data *sdata;
+
+ map = &sbi->s_partmaps[partition];
+ sdata = &map->s_type_specific.s_sparing;
+ packet = (block + offset) & ~(sdata->s_packet_len - 1);
+
+ for (i = 0; i < 4; i++) {
+ if (sdata->s_spar_map[i] != NULL) {
+ st = (struct sparingTable *)
+ sdata->s_spar_map[i]->b_data;
+ break;
+ }
+ }
+
+ if (st) {
+ for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
+ struct sparingEntry *entry = &st->mapEntry[i];
+ u32 origLoc = le32_to_cpu(entry->origLocation);
+ if (origLoc >= 0xFFFFFFF0)
+ break;
+ else if (origLoc == packet)
+ return le32_to_cpu(entry->mappedLocation) +
+ ((block + offset) &
+ (sdata->s_packet_len - 1));
+ else if (origLoc > packet)
+ break;
+ }
+ }
+
+ return map->s_partition_root + block + offset;
+}
+
+int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
+{
+ struct udf_sparing_data *sdata;
+ struct sparingTable *st = NULL;
+ struct sparingEntry mapEntry;
+ uint32_t packet;
+ int i, j, k, l;
+ struct udf_sb_info *sbi = UDF_SB(sb);
+ u16 reallocationTableLen;
+ struct buffer_head *bh;
+ int ret = 0;
+
+ mutex_lock(&sbi->s_alloc_mutex);
+ for (i = 0; i < sbi->s_partitions; i++) {
+ struct udf_part_map *map = &sbi->s_partmaps[i];
+ if (old_block > map->s_partition_root &&
+ old_block < map->s_partition_root + map->s_partition_len) {
+ sdata = &map->s_type_specific.s_sparing;
+ packet = (old_block - map->s_partition_root) &
+ ~(sdata->s_packet_len - 1);
+
+ for (j = 0; j < 4; j++)
+ if (sdata->s_spar_map[j] != NULL) {
+ st = (struct sparingTable *)
+ sdata->s_spar_map[j]->b_data;
+ break;
+ }
+
+ if (!st) {
+ ret = 1;
+ goto out;
+ }
+
+ reallocationTableLen =
+ le16_to_cpu(st->reallocationTableLen);
+ for (k = 0; k < reallocationTableLen; k++) {
+ struct sparingEntry *entry = &st->mapEntry[k];
+ u32 origLoc = le32_to_cpu(entry->origLocation);
+
+ if (origLoc == 0xFFFFFFFF) {
+ for (; j < 4; j++) {
+ int len;
+ bh = sdata->s_spar_map[j];
+ if (!bh)
+ continue;
+
+ st = (struct sparingTable *)
+ bh->b_data;
+ entry->origLocation =
+ cpu_to_le32(packet);
+ len =
+ sizeof(struct sparingTable) +
+ reallocationTableLen *
+ sizeof(struct sparingEntry);
+ udf_update_tag((char *)st, len);
+ mark_buffer_dirty(bh);
+ }
+ *new_block = le32_to_cpu(
+ entry->mappedLocation) +
+ ((old_block -
+ map->s_partition_root) &
+ (sdata->s_packet_len - 1));
+ ret = 0;
+ goto out;
+ } else if (origLoc == packet) {
+ *new_block = le32_to_cpu(
+ entry->mappedLocation) +
+ ((old_block -
+ map->s_partition_root) &
+ (sdata->s_packet_len - 1));
+ ret = 0;
+ goto out;
+ } else if (origLoc > packet)
+ break;
+ }
+
+ for (l = k; l < reallocationTableLen; l++) {
+ struct sparingEntry *entry = &st->mapEntry[l];
+ u32 origLoc = le32_to_cpu(entry->origLocation);
+
+ if (origLoc != 0xFFFFFFFF)
+ continue;
+
+ for (; j < 4; j++) {
+ bh = sdata->s_spar_map[j];
+ if (!bh)
+ continue;
+
+ st = (struct sparingTable *)bh->b_data;
+ mapEntry = st->mapEntry[l];
+ mapEntry.origLocation =
+ cpu_to_le32(packet);
+ memmove(&st->mapEntry[k + 1],
+ &st->mapEntry[k],
+ (l - k) *
+ sizeof(struct sparingEntry));
+ st->mapEntry[k] = mapEntry;
+ udf_update_tag((char *)st,
+ sizeof(struct sparingTable) +
+ reallocationTableLen *
+ sizeof(struct sparingEntry));
+ mark_buffer_dirty(bh);
+ }
+ *new_block =
+ le32_to_cpu(
+ st->mapEntry[k].mappedLocation) +
+ ((old_block - map->s_partition_root) &
+ (sdata->s_packet_len - 1));
+ ret = 0;
+ goto out;
+ }
+
+ ret = 1;
+ goto out;
+ } /* if old_block */
+ }
+
+ if (i == sbi->s_partitions) {
+ /* outside of partitions */
+ /* for now, fail =) */
+ ret = 1;
+ }
+
+out:
+ mutex_unlock(&sbi->s_alloc_mutex);
+ return ret;
+}
+
+static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
+ uint16_t partition, uint32_t offset)
+{
+ struct super_block *sb = inode->i_sb;
+ struct udf_part_map *map;
+ struct kernel_lb_addr eloc;
+ uint32_t elen;
+ sector_t ext_offset;
+ struct extent_position epos = {};
+ uint32_t phyblock;
+
+ if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
+ (EXT_RECORDED_ALLOCATED >> 30))
+ phyblock = 0xFFFFFFFF;
+ else {
+ map = &UDF_SB(sb)->s_partmaps[partition];
+ /* map to sparable/physical partition desc */
+ phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
+ map->s_partition_num, ext_offset + offset);
+ }
+
+ brelse(epos.bh);
+ return phyblock;
+}
+
+uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
+ uint16_t partition, uint32_t offset)
+{
+ struct udf_sb_info *sbi = UDF_SB(sb);
+ struct udf_part_map *map;
+ struct udf_meta_data *mdata;
+ uint32_t retblk;
+ struct inode *inode;
+
+ udf_debug("READING from METADATA\n");
+
+ map = &sbi->s_partmaps[partition];
+ mdata = &map->s_type_specific.s_metadata;
+ inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
+
+ /* We shouldn't mount such media... */
+ BUG_ON(!inode);
+ retblk = udf_try_read_meta(inode, block, partition, offset);
+ if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
+ udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
+ if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) {
+ mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
+ mdata->s_mirror_file_loc, map->s_partition_num);
+ mdata->s_flags |= MF_MIRROR_FE_LOADED;
+ }
+
+ inode = mdata->s_mirror_fe;
+ if (!inode)
+ return 0xFFFFFFFF;
+ retblk = udf_try_read_meta(inode, block, partition, offset);
+ }
+
+ return retblk;
+}
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