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-rw-r--r--fs/udf/partition.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/fs/udf/partition.c b/fs/udf/partition.c
new file mode 100644
index 000000000000..4d36f264be0d
--- /dev/null
+++ b/fs/udf/partition.c
@@ -0,0 +1,226 @@
+/*
+ * partition.c
+ *
+ * PURPOSE
+ * Partition handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * CONTACTS
+ * E-mail regarding any portion of the Linux UDF file system should be
+ * directed to the development team mailing list (run by majordomo):
+ * linux_udf@hpesjro.fc.hp.com
+ *
+ * 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/udf_fs.h>
+#include <linux/slab.h>
+#include <linux/buffer_head.h>
+
+inline uint32_t udf_get_pblock(struct super_block *sb, uint32_t block, uint16_t partition, uint32_t offset)
+{
+ if (partition >= UDF_SB_NUMPARTS(sb))
+ {
+ udf_debug("block=%d, partition=%d, offset=%d: invalid partition\n",
+ block, partition, offset);
+ return 0xFFFFFFFF;
+ }
+ if (UDF_SB_PARTFUNC(sb, partition))
+ return UDF_SB_PARTFUNC(sb, partition)(sb, block, partition, offset);
+ else
+ return UDF_SB_PARTROOT(sb, partition) + 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;
+
+ index = (sb->s_blocksize - UDF_SB_TYPEVIRT(sb,partition).s_start_offset) / sizeof(uint32_t);
+
+ if (block > UDF_SB_TYPEVIRT(sb,partition).s_num_entries)
+ {
+ udf_debug("Trying to access block beyond end of VAT (%d max %d)\n",
+ block, UDF_SB_TYPEVIRT(sb,partition).s_num_entries);
+ return 0xFFFFFFFF;
+ }
+
+ 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 = UDF_SB_TYPEVIRT(sb,partition).s_start_offset / sizeof(uint32_t) + block;
+ }
+
+ loc = udf_block_map(UDF_SB_VAT(sb), newblock);
+
+ if (!(bh = sb_bread(sb, loc)))
+ {
+ 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]);
+
+ udf_release_data(bh);
+
+ if (UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum == partition)
+ {
+ udf_debug("recursive call to udf_get_pblock!\n");
+ return 0xFFFFFFFF;
+ }
+
+ return udf_get_pblock(sb, loc, UDF_I_LOCATION(UDF_SB_VAT(sb)).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;
+ uint32_t packet = (block + offset) & ~(UDF_SB_TYPESPAR(sb,partition).s_packet_len - 1);
+
+ for (i=0; i<4; i++)
+ {
+ if (UDF_SB_TYPESPAR(sb,partition).s_spar_map[i] != NULL)
+ {
+ st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,partition).s_spar_map[i]->b_data;
+ break;
+ }
+ }
+
+ if (st)
+ {
+ for (i=0; i<le16_to_cpu(st->reallocationTableLen); i++)
+ {
+ if (le32_to_cpu(st->mapEntry[i].origLocation) >= 0xFFFFFFF0)
+ break;
+ else if (le32_to_cpu(st->mapEntry[i].origLocation) == packet)
+ {
+ return le32_to_cpu(st->mapEntry[i].mappedLocation) +
+ ((block + offset) & (UDF_SB_TYPESPAR(sb,partition).s_packet_len - 1));
+ }
+ else if (le32_to_cpu(st->mapEntry[i].origLocation) > packet)
+ break;
+ }
+ }
+ return UDF_SB_PARTROOT(sb,partition) + 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;
+
+ for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
+ {
+ if (old_block > UDF_SB_PARTROOT(sb,i) &&
+ old_block < UDF_SB_PARTROOT(sb,i) + UDF_SB_PARTLEN(sb,i))
+ {
+ sdata = &UDF_SB_TYPESPAR(sb,i);
+ packet = (old_block - UDF_SB_PARTROOT(sb,i)) & ~(sdata->s_packet_len - 1);
+
+ for (j=0; j<4; j++)
+ {
+ if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
+ {
+ st = (struct sparingTable *)sdata->s_spar_map[j]->b_data;
+ break;
+ }
+ }
+
+ if (!st)
+ return 1;
+
+ for (k=0; k<le16_to_cpu(st->reallocationTableLen); k++)
+ {
+ if (le32_to_cpu(st->mapEntry[k].origLocation) == 0xFFFFFFFF)
+ {
+ for (; j<4; j++)
+ {
+ if (sdata->s_spar_map[j])
+ {
+ st = (struct sparingTable *)sdata->s_spar_map[j]->b_data;
+ st->mapEntry[k].origLocation = cpu_to_le32(packet);
+ udf_update_tag((char *)st, sizeof(struct sparingTable) + le16_to_cpu(st->reallocationTableLen) * sizeof(struct sparingEntry));
+ mark_buffer_dirty(sdata->s_spar_map[j]);
+ }
+ }
+ *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) +
+ ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1));
+ return 0;
+ }
+ else if (le32_to_cpu(st->mapEntry[k].origLocation) == packet)
+ {
+ *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) +
+ ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1));
+ return 0;
+ }
+ else if (le32_to_cpu(st->mapEntry[k].origLocation) > packet)
+ break;
+ }
+ for (l=k; l<le16_to_cpu(st->reallocationTableLen); l++)
+ {
+ if (le32_to_cpu(st->mapEntry[l].origLocation) == 0xFFFFFFFF)
+ {
+ for (; j<4; j++)
+ {
+ if (sdata->s_spar_map[j])
+ {
+ st = (struct sparingTable *)sdata->s_spar_map[j]->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) + le16_to_cpu(st->reallocationTableLen) * sizeof(struct sparingEntry));
+ mark_buffer_dirty(sdata->s_spar_map[j]);
+ }
+ }
+ *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) +
+ ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1));
+ return 0;
+ }
+ }
+ return 1;
+ }
+ }
+ if (i == UDF_SB_NUMPARTS(sb))
+ {
+ /* outside of partitions */
+ /* for now, fail =) */
+ return 1;
+ }
+
+ return 0;
+}
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