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From: Andriy Gapon <avg@FreeBSD.org>
Subject: Re: kern/175323: Fail to use ZVOL as a gmirror component
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The following reply was made to PR kern/175323; it has been noted by GNATS.

From: Andriy Gapon <avg@FreeBSD.org>
To: bug-followup@FreeBSD.org, softkot@gmail.com
Cc: freebsd-geom@FreeBSD.org
Subject: Re: kern/175323: Fail to use ZVOL as a gmirror component
Date: Mon, 21 Jan 2013 11:47:05 +0200

 This
 > GEOM_MIRROR: Cannot add disk zvol/tank0/vol0 to mirror0 (error=45).
 
 seems to be triggered by the following code in sys/geom/mirror/g_mirror.c:
 
 error = g_getattr("GEOM::candelete", disk->d_consumer, &i);
 if (error != 0)
         goto fail;
 
 plus the fact that ZFS zvol does the following:
 case BIO_GETATTR:
 case BIO_DELETE:
 default:
         g_io_deliver(bp, EOPNOTSUPP);
         break;
 
 Perhaps, the gmirror code should be more flexible with respect to EOPNOTSUPP
 from g_getattr?
 
 -- 
 Andriy Gapon