For use by the EFI loader, we will need to know a partition's number
within the partition table on disk, so have the devfs-core keep track
of that.
Mere iteration over the cdev list doesn't work for thus purpose as there
may be invalid PTEs, which cause e.g. the first on-disk partition to
have a higher number.
See 9dfffaf2ef47 ("partitions: efi: Continue partition enumeration on
invalid pte") for more info. A real world example is the current
debian-13-nocloud-arm64.raw image, which has two partitions:
0 and 14 (or 1 and 15 in barebox).
Signed-off-by: Ahmad Fatoum <[email protected]>
---
v1 -> v2:
- record actual partition number from the table.
I compared against EDK-II and Linux and both take the actual
number, which may not be either the number in our cdev list
or the location on disk.
---
common/partitions.c | 1 +
include/driver.h | 3 +++
2 files changed, 4 insertions(+)
diff --git a/common/partitions.c b/common/partitions.c
index 1a4e046c5f55..40f4c629e1ac 100644
--- a/common/partitions.c
+++ b/common/partitions.c
@@ -52,6 +52,7 @@ static int register_one_partition(struct block_device *blk,
struct partition *pa
goto out;
}
+ cdev->partition_table_index = part->num;
cdev->flags |= DEVFS_PARTITION_FROM_TABLE | part->flags;
cdev->typeflags |= part->typeflags;
cdev->typeuuid = part->typeuuid;
diff --git a/include/driver.h b/include/driver.h
index 14d1731fd976..01e16e7a73ab 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -436,6 +436,9 @@ struct cdev {
loff_t size;
unsigned int flags;
u16 typeflags; /* GPT type-specific attributes */
+ s8 partition_table_index; /* For GPT/MBR-formatted disks only:
+ * 1-based index of partition on disk
+ */
int open;
struct mtd_info *mtd;
struct list_head aliases;
--
2.47.3
