Mounting a file causes device scan

[OriginCode]

root in /tmp
> file bcachefs-test
bcachefs-test: bcachefs, UUID=3c4f99a5-35ad-4b0f-9bac-7148031fcf80, version 1031, min version 1031, device 0, 1 devices

root in /tmp
> mount ./bcachefs-test /mnt/
bcachefs (/dev/nvme0n1): error reading default superblock: Not a bcachefs superblock (got magic 00000000-0000-0000-0000-000000000000)
bcachefs (/dev/nvme0n1): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme0n1p1): error reading default superblock: Not a bcachefs superblock (got magic 00000000-0000-0000-0000-000000000000)
bcachefs (/dev/nvme0n1p1): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme0n1p2): error reading default superblock: Not a bcachefs superblock (got magic 00000000-0000-0000-0000-000000000000)
bcachefs (/dev/nvme0n1p2): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme0n1p3): error reading default superblock: Not a bcachefs superblock (got magic 2faf4bbe-5aee-bf89-11e3-ed1d72da18dd)
bcachefs (/dev/nvme0n1p3): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme0n1p4): error reading default superblock: Not a bcachefs superblock (got magic a8006661-901f-0706-1e66-6067807b0800)
bcachefs (/dev/nvme0n1p4): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme0n1p5): error reading default superblock: Not a bcachefs superblock (got magic a8006661-901f-0706-1e66-6067807b0800)
bcachefs (/dev/nvme0n1p5): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme1n1): error reading default superblock: Not a bcachefs superblock (got magic 00000000-0000-0000-0000-000000000000)
bcachefs (/dev/nvme1n1): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme1n1p1): error reading default superblock: Not a bcachefs superblock (got magic 00000000-0000-0000-0000-000000000000)
bcachefs (/dev/nvme1n1p1): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme1n1p2): error reading default superblock: Not a bcachefs superblock (got magic 3a226c75-6b73-3222-2c22-6b65795f7369)
bcachefs (/dev/nvme1n1p2): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/nvme1n1p3): error reading default superblock: Not a bcachefs superblock (got magic 3a226c75-6b73-3222-2c22-6b65795f7369)
bcachefs (/dev/nvme1n1p3): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/loop1): error reading default superblock: IO error: -5
bcachefs (/dev/loop1): error reading superblock: IO error: -5
bcachefs (/dev/loop2): error reading default superblock: IO error: -5
bcachefs (/dev/loop2): error reading superblock: IO error: -5
bcachefs (/dev/loop3): error reading default superblock: IO error: -5
bcachefs (/dev/loop3): error reading superblock: IO error: -5
bcachefs (/dev/loop4): error reading default superblock: IO error: -5
bcachefs (/dev/loop4): error reading superblock: IO error: -5
bcachefs (/dev/loop5): error reading default superblock: IO error: -5
bcachefs (/dev/loop5): error reading superblock: IO error: -5
bcachefs (/dev/loop6): error reading default superblock: IO error: -5
bcachefs (/dev/loop6): error reading superblock: IO error: -5
bcachefs (/dev/loop7): error reading default superblock: IO error: -5
bcachefs (/dev/loop7): error reading superblock: IO error: -5
bcachefs (/dev/dm-0): error reading default superblock: Not a bcachefs superblock (got magic 00000000-0000-0000-0000-000000000000)
bcachefs (/dev/dm-0): error reading superblock: Not a bcachefs superblock layout
bcachefs (/dev/dm-1): error reading default superblock: Not a bcachefs superblock (got magic 00000000-0000-0000-0000-000000000000)
bcachefs (/dev/dm-1): error reading superblock: Not a bcachefs superblock layout

[OriginCode]

The file was created using truncate -s 1G bcachefs-test.

[tmuehlbacher]

Duplicate of #239?

[OriginCode]

@tmuehlbacher Might be, I'm not sure if this is related to the type of argument given to the command or not.