[Bug 230220] UFS: the freezing ioctl (i.e.UFSSUSPEND) causes panic or EBUSY

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230220

--- Comment #13 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Edward Tomasz Napierala from comment #12)
kib is right. As I described in comment #9, the design of Hyper-V live back up
of a guest is that: the Hyper-V host only backs up the guest disk image, and
the guest RAM is not backed up. The Hyper-V host needs to temporarily freeze
the guest's mounted file systems to make sure they're consistent. 

Thanks for the pointer to growfs(8). I'll study how it's implemented.

@kib: I suppose you'll commit your patch soon:

Created attachment 195685 [details]
another fix, unsuspend on devfs_set_cdevpriv() error

Thank you!

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