[PATCH v2 09/19] cdev: use more descriptive struct cdev::diskuuid/partuuid

[Ahmad Fatoum]

The UUID field has different meanings:

For a master cdev:

  - GPT Header DiskGUID if GPT-formatted
  - MBR Header NT Disk Signature if MBR-formatted

For a partition cdev:

  - GPT UniquePartitionGUID
  - MBR Header NT Disk Signature followed by "-${partititon_number}"

Later code will add yet another UUID (Partition Type GUID), so let's
make existing code more readable by using either diskuuid or partuuid as
appropriate.

No functional change.

Reviewed-by: Marco Felsch <m.felsch at pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
v1 -> v2:
  - Add Marco's Reviewed-by
---
 common/bootm.c                 |  2 +-
 common/partitions.c            |  2 +-
 common/partitions/dos.c        |  2 +-
 common/partitions/efi.c        |  4 ++--
 drivers/misc/storage-by-uuid.c |  4 ++--
 fs/devfs-core.c                |  4 ++--
 fs/fs.c                        |  9 +++++----
 include/driver.h               | 10 +++++++++-
 8 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/common/bootm.c b/common/bootm.c
index 91a6e1688674..791d6b8fbbf1 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -734,7 +734,7 @@ int bootm_boot(struct bootm_data *bootm_data)
 				if (!root_cdev)
 					pr_err("no cdev found for %s, cannot set root= option\n",
 						root_dev_name);
-				else if (!root_cdev->uuid[0])
+				else if (!root_cdev->partuuid[0])
 					pr_err("%s doesn't have a PARTUUID, cannot set root= option\n",
 						root_dev_name);
 			}
diff --git a/common/partitions.c b/common/partitions.c
index 9cca5c4a1546..b579559672a0 100644
--- a/common/partitions.c
+++ b/common/partitions.c
@@ -51,7 +51,7 @@ static int register_one_partition(struct block_device *blk,
 	cdev->flags |= DEVFS_PARTITION_FROM_TABLE;
 
 	cdev->dos_partition_type = part->dos_partition_type;
-	strcpy(cdev->uuid, part->partuuid);
+	strcpy(cdev->partuuid, part->partuuid);
 
 	free(partition_name);
 
diff --git a/common/partitions/dos.c b/common/partitions/dos.c
index 566c8dd949b4..ad60c0b27b46 100644
--- a/common/partitions/dos.c
+++ b/common/partitions/dos.c
@@ -183,7 +183,7 @@ static void dos_partition(void *buf, struct block_device *blk,
 	uint32_t signature = get_unaligned_le32(buf + 0x1b8);
 
 	if (signature)
-		sprintf(blk->cdev.uuid, "%08x", signature);
+		sprintf(blk->cdev.diskuuid, "%08x", signature);
 
 	table = (struct partition_entry *)&buffer[446];
 
diff --git a/common/partitions/efi.c b/common/partitions/efi.c
index 60c981666fc8..258e7210d2af 100644
--- a/common/partitions/efi.c
+++ b/common/partitions/efi.c
@@ -446,8 +446,8 @@ static void efi_partition(void *buf, struct block_device *blk,
 		return;
 	}
 
-	snprintf(blk->cdev.uuid, sizeof(blk->cdev.uuid), "%pUl", &gpt->disk_guid);
-	dev_add_param_string_fixed(blk->dev, "guid", blk->cdev.uuid);
+	snprintf(blk->cdev.diskuuid, sizeof(blk->cdev.diskuuid), "%pUl", &gpt->disk_guid);
+	dev_add_param_string_fixed(blk->dev, "guid", blk->cdev.diskuuid);
 
 	nb_part = le32_to_cpu(gpt->num_partition_entries);
 
diff --git a/drivers/misc/storage-by-uuid.c b/drivers/misc/storage-by-uuid.c
index a938bfaaa2c4..a7a66a1421a3 100644
--- a/drivers/misc/storage-by-uuid.c
+++ b/drivers/misc/storage-by-uuid.c
@@ -140,8 +140,8 @@ static void check_exist(struct sbu *sbu)
 	struct cdev *cdev;
 
 	for_each_cdev(cdev) {
-		if (!strcmp(cdev->uuid, sbu->uuid)) {
-			dev_dbg(sbu->dev, "Found %s %s\n", cdev->name, cdev->uuid);
+		if (!strcmp(cdev->diskuuid, sbu->uuid)) {
+			dev_dbg(sbu->dev, "Found %s %s\n", cdev->name, cdev->diskuuid);
 			storage_by_uuid_add_partitions(sbu, cdev);
 		}
 	}
diff --git a/fs/devfs-core.c b/fs/devfs-core.c
index 7525fd7f49cb..72a37918962b 100644
--- a/fs/devfs-core.c
+++ b/fs/devfs-core.c
@@ -104,7 +104,7 @@ struct cdev *cdev_by_partuuid(const char *partuuid)
 		return NULL;
 
 	for_each_cdev(cdev) {
-		if (cdev_is_partition(cdev) && !strcasecmp(cdev->uuid, partuuid))
+		if (cdev_is_partition(cdev) && !strcasecmp(cdev->partuuid, partuuid))
 			return cdev;
 	}
 	return NULL;
@@ -118,7 +118,7 @@ struct cdev *cdev_by_diskuuid(const char *diskuuid)
 		return NULL;
 
 	for_each_cdev(cdev) {
-		if (!cdev_is_partition(cdev) && !strcasecmp(cdev->uuid, diskuuid))
+		if (!cdev_is_partition(cdev) && !strcasecmp(cdev->diskuuid, diskuuid))
 			return cdev;
 	}
 	return NULL;
diff --git a/fs/fs.c b/fs/fs.c
index 82d6c98ffe86..dda6e3f1d6e7 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -104,8 +104,9 @@ void cdev_print(const struct cdev *cdev)
 		nbytes += printf("Filetype: %s\t", file_type_to_string(cdev->filetype));
 	if (cdev->dos_partition_type)
 		nbytes += printf("DOS parttype: 0x%02x\t", cdev->dos_partition_type);
-	if (*cdev->uuid)
-		nbytes += printf("UUID: %s", cdev->uuid);
+	if (*cdev->partuuid || *cdev->diskuuid)
+		nbytes += printf("%sUUID: %s", cdev_is_partition(cdev) ? "PART" : "DISK",
+				 cdev_is_partition(cdev) ? cdev->partuuid : cdev->diskuuid);
 
 	if (nbytes)
 		printf("\n");
@@ -3082,8 +3083,8 @@ char *cdev_get_linux_rootarg(const struct cdev *cdev)
 	if (str)
 		return str;
 
-	if (cdev->uuid[0] != 0)
-		return basprintf("root=PARTUUID=%s", cdev->uuid);
+	if (cdev->partuuid[0] != 0)
+		return basprintf("root=PARTUUID=%s", cdev->partuuid);
 
 	return NULL;
 }
diff --git a/include/driver.h b/include/driver.h
index 22dba61439cd..5bdce8e8afb2 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -522,7 +522,15 @@ struct cdev {
 	char *partname; /* the partition name, usually the above without the
 			 * device part, i.e. name = "nand0.barebox" -> partname = "barebox"
 			 */
-	char uuid[MAX_UUID_STR];
+	union {
+		char diskuuid[MAX_UUID_STR];	/* GPT Header DiskGUID or
+						 * MBR Header NT Disk Signature
+						 */
+		char partuuid[MAX_UUID_STR];	/* GPT Partition Entry UniquePartitionGUID or
+						 * MBR Partition Entry "${nt_signature}-${partno}"
+						 */
+	};
+
 	loff_t offset;
 	loff_t size;
 	unsigned int flags;
-- 
2.39.2