linux-kernel - bcachefs fails to mount loop device on kernel

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Date: Wed, 24 Jan 2024 21:00:32 +0100
From: Petr Vorel <pvorel@...e.cz>
To: Kent Overstreet <kent.overstreet@...ux.dev>,
	Brian Foster <bfoster@...hat.com>
Cc: linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org,
	ltp@...ts.linux.it
Subject: bcachefs fails to mount loop device on kernel

Hi all,

bcachefs fails to mount loop device on kernel on both 6.7 and 6.8.0-rc1.
Is mounting loop even supported?

dd if=/dev/zero of=test_file bs=400M count=1
losetup /dev/loop0 test_file
mkfs.bcachefs /dev/loop0

mount -t bcachefs -o loop test_file /mnt
=> Unknown command /dev/loop0

modprobe bcachefs
mount -t bcachefs -o loop test_file /mnt
=> mount: /mnt: failed to setup loop device for test_file.

mount -t bcachefs test_file /mnt
=> Unknown command test_file

mount -t bcachefs -o loop /dev/loop0 /mnt
=> Unknown command /dev/loop1

mount -t bcachefs /dev/loop0 /mnt
=> Unknown command /dev/loop0

bcachefs mount /dev/loop0 /mnt
=> Unknown command mount

Thanks for info.

Kind regards,
Petr