5:30 p.m.
From: "Richard W.M. Jones" <rjones(a)redhat.com>
---
filters/partition/Makefile.am | 1 +
filters/partition/partition-gpt.c | 62 ++++++++++++++++++---------------------
2 files changed, 29 insertions(+), 34 deletions(-)
diff --git a/filters/partition/Makefile.am b/filters/partition/Makefile.am
index 0932793..7814f09 100644
--- a/filters/partition/Makefile.am
+++ b/filters/partition/Makefile.am
@@ -45,6 +45,7 @@ nbdkit_partition_filter_la_SOURCES = \
nbdkit_partition_filter_la_CPPFLAGS = \
-I$(top_srcdir)/include \
+ -I$(top_srcdir)/common/gpt \
-I$(top_srcdir)/common/include
nbdkit_partition_filter_la_CFLAGS = \
$(WARNINGS_CFLAGS)
diff --git a/filters/partition/partition-gpt.c b/filters/partition/partition-gpt.c
index ddfaa75..007799a 100644
--- a/filters/partition/partition-gpt.c
+++ b/filters/partition/partition-gpt.c
@@ -41,37 +41,29 @@
#include <nbdkit-filter.h>
#include "byte-swapping.h"
+#include "gpt.h"
#include "partition.h"
-struct gpt_header {
- uint32_t nr_partitions;
- uint32_t partition_entry_size;
-};
-
static void
-get_gpt_header (uint8_t *sector, struct gpt_header *header)
+get_gpt_header (uint8_t *sector,
+ uint32_t *nr_partition_entries,
+ uint32_t *size_partition_entry)
{
- memcpy (&header->nr_partitions, §or[0x50], 4);
- header->nr_partitions = le32toh (header->nr_partitions);
- memcpy (&header->partition_entry_size, §or[0x54], 4);
- header->partition_entry_size = le32toh (header->partition_entry_size);
+ struct gpt_header *header = (struct gpt_header *) sector;
+ *nr_partition_entries = le32toh (header->nr_partition_entries);
+ *size_partition_entry = le32toh (header->size_partition_entry);
}
-struct gpt_partition {
- uint8_t partition_type_guid[16];
- uint64_t first_lba;
- uint64_t last_lba;
-};
-
static void
-get_gpt_partition (uint8_t *bytes, struct gpt_partition *part)
+get_gpt_partition (uint8_t *bytes,
+ uint8_t *partition_type_guid,
+ uint64_t *first_lba, uint64_t *last_lba)
{
- memcpy (&part->partition_type_guid, &bytes[0], 16);
- memcpy (&part->first_lba, &bytes[0x20], 8);
- part->first_lba = le64toh (part->first_lba);
- memcpy (&part->last_lba, &bytes[0x28], 8);
- part->last_lba = le64toh (part->last_lba);
+ struct gpt_entry *entry = (struct gpt_entry *) bytes;
+ memcpy (partition_type_guid, entry->partition_type_guid, 16);
+ *first_lba = le64toh (entry->first_lba);
+ *last_lba = le64toh (entry->last_lba);
}
int
@@ -80,18 +72,19 @@ find_gpt_partition (struct nbdkit_next_ops *next_ops, void *nxdata,
int64_t *offset_r, int64_t *range_r)
{
uint8_t partition_bytes[128];
- struct gpt_header header;
- struct gpt_partition partition;
+ uint32_t nr_partition_entries, size_partition_entry;
+ uint8_t partition_type_guid[16];
+ uint64_t first_lba, last_lba;
int i;
int err;
- get_gpt_header (header_bytes, &header);
- if (partnum > header.nr_partitions) {
+ get_gpt_header (header_bytes, &nr_partition_entries, &size_partition_entry);
+ if (partnum > nr_partition_entries) {
nbdkit_error ("GPT partition number out of range");
return -1;
}
- if (header.partition_entry_size < 128) {
+ if (size_partition_entry < 128) {
nbdkit_error ("GPT partition entry size is < 128 bytes");
return -1;
}
@@ -101,23 +94,24 @@ find_gpt_partition (struct nbdkit_next_ops *next_ops, void *nxdata,
* that the GPT header is bogus.
*/
if (size < INT64_C(3)*SECTOR_SIZE +
- INT64_C(2) * header.nr_partitions * header.partition_entry_size) {
+ INT64_C(2) * nr_partition_entries * size_partition_entry) {
nbdkit_error ("GPT partition table is too large for this disk");
return -1;
}
- for (i = 0; i < header.nr_partitions; ++i) {
+ for (i = 0; i < nr_partition_entries; ++i) {
/* We already checked these are within bounds above. */
if (next_ops->pread (nxdata, partition_bytes, sizeof partition_bytes,
- 2*SECTOR_SIZE + i*header.partition_entry_size, 0,
+ 2*SECTOR_SIZE + i*size_partition_entry, 0,
&err) == -1)
return -1;
- get_gpt_partition (partition_bytes, &partition);
- if (memcmp (partition.partition_type_guid,
+ get_gpt_partition (partition_bytes,
+ partition_type_guid, &first_lba, &last_lba);
+ if (memcmp (partition_type_guid,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16) != 0 &&
partnum == i+1) {
- *offset_r = partition.first_lba * SECTOR_SIZE;
- *range_r = (1 + partition.last_lba - partition.first_lba) * SECTOR_SIZE;
+ *offset_r = first_lba * SECTOR_SIZE;
+ *range_r = (1 + last_lba - first_lba) * SECTOR_SIZE;
return 0;
}
}
--
1.8.3.1