On Wed, Nov 16, 2022 at 09:56:37PM -0800, Christoph Hellwig wrote:

On Thu, Nov 17, 2022 at 12:44:40AM +0000, Daniel Golle wrote:

quoted

Add function bdev_add_partition_ro() which can be used by drivers to
register named read-only partitions on a disk device.
Unlike the existing bdev_add_partition() function, there is also no
check for overlapping partitions.
This new function is going to be used by the uImage.FIT parser.

Err, no.  No on has any business adding partitions to the block device
except for the partition parser.

Well, there is a user-space ioctl for this as well[1], just that won't
set the partition to read-only and also doesn't allow naming it...

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/block/ioctl.c#n40