[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 #3 from Dexuan Cui <decui at microsoft.com> ---
BTW, I don't know why the file contrib/hyperv/tools/hv_vss_daemon.c
(https://github.com/freebsd/freebsd/blob/master/contrib/hyperv/tools/hv_vss_daemon.c
does NOT use ioctl(g_ufs_suspend_handle, UFSRESUME, ...). 

I found the below links:

https://lists.freebsd.org/pipermail/freebsd-fs/2016-June/023447.html
https://reviews.freebsd.org/D8224?id=22069

And the 2nd link says:
"the filesystem gets automatically unsuspended as soon as you close the
/dev/ufssuspend file descriptor."


So it looks closing the /dev/ufssuspend file descriptor is equivalent to
ioctl(g_ufs_suspend_handle, UFSRESUME, ...)?

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