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Date:      Sun, 13 Feb 2022 12:30:59 +0000
From:      bugzilla-noreply@freebsd.org
To:        virtualization@FreeBSD.org
Subject:   [Bug 260200] AHCI emulation throws CAM errors when backed by  -t malloc memory disk devices
Message-ID:  <bug-260200-27103-qgS1lFwdmf@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-260200-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-260200-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D260200

--- Comment #6 from Aleksandr Fedorov <afedorov@FreeBSD.org> ---
I think the swap backend should also ignore the BIO_FLUSH command. Because =
swap
is not a persistent storage, I don't know how BIO_FLUSH can be useful.

As for ctl(4), it works with SCSI commands. Ramdisk backend simply ignores =
the
SYNCHRONIZE_CACHE and SYNCHRONIZE_CACHE_16 commands:
https://github.com/freebsd/freebsd-src/blob/main/sys/cam/ctl/ctl_backend_ra=
mdisk.c#L748

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