How to check when "raw" format driver uses a "regular" file?

[Philippe Mathieu-Daudé]

Hi,

Is it possible to restrict a block driver to a particular set of
options? In my case I'd like to restrict the raw driver to regular files.

I noticed the NFS driver does it locally in nfs_client_open(),
and FUSE has is_regular_file() -- which is POSIX specific however.

When a backend is a SCSI drive, the block layer provide the blk_is_sg()
method to test it.
1/ Should I provide a similar blk_is_regular_file()?

2/ There is no oslib function to check for regular file,
should I add one too?

Thanks,

Phil.