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

From: Philippe Mathieu-Daudé
Subject: How to check when "raw" format driver uses a "regular" file?
Date: Mon, 25 Jan 2021 16:05:59 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0


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?



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