disk: part_efi: add support for the Secondary GPT

PATCH Superseded Steve Rae 1 participant 1 message May 5, 2014

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Steve Rae

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2014-05-05 18:39 UTC #0 lore raw

PATCH v2 1/1 disk: part_efi: add support for the Secondary GPT

Check the Secondary GPT table if the Primary GPT table is invalid.

Signed-off-by Steve Rae <[email protected]>

---

Changes in v2:
- changed wording: "Alternate" to "Secondary"

 disk/part_efi.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

disk/part_efi.c +18 -2

index 216a292..f909229 100644
@@ -93,7 +93,15 @@ void print_part_efi(block_dev_desc_t * dev_desc)
 	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 			 gpt_head, &gpt_pte) != 1) {
 		printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
-		return;
+		if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
+				 gpt_head, &gpt_pte) != 1) {
+			printf("%s: *** ERROR: Invalid Secondary GPT ***\n",
+			       __func__);
+			return;
+		} else {
+			printf("%s: ***        Using Secondary GPT ***\n",
+			       __func__);
+		}
 	}
 
 	debug("%s: gpt-entry at %p\n", __func__, gpt_pte);

@@ -142,7 +150,15 @@ int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
 	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 			gpt_head, &gpt_pte) != 1) {
 		printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
-		return -1;
+		if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
+				 gpt_head, &gpt_pte) != 1) {
+			printf("%s: *** ERROR: Invalid Secondary GPT ***\n",
+			       __func__);
+			return -1;
+		} else {
+			printf("%s: ***        Using Secondary GPT ***\n",
+			       __func__);
+		}
 	}
 
 	if (part > le32_to_cpu(gpt_head->num_partition_entries) ||

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