Re: [PATCH 3/5] fsfreeze: freeze_super and thaw_bdev don't play welltogether

[Christoph Hellwig]

This breaks the "feature" that we can freeze a block device that doesn't
have a filesystem mounted yet.  For filesystems using get_sb_bdev that
prevents a new filesystem to be mounted on them.

I'm not sure it's a particularly useful feature, but it's been there
since day 1 of the freeze support.  The easiest way to not break it
would be to keep the per-sb freeze count only for that case and only
check it during mount.
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