The following reply was made to PR kern/34882; it has been noted by GNATS.

From: "Julio M. Merino Vidal" <jmmv84@gmail.com>
To: tech-kern <tech-kern@netbsd.org>, gnats-bugs@NetBSD.org
Cc: 
Subject: Use vn_rdwr in vnd (Re: kern/34882)
Date: Tue, 7 Nov 2006 14:57:06 +0100

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 Hello,
 
 vnd currently relies on the VOP_BMAP and VOP_STRATEGY operations to
 access the vnode holding the disk image.  Unfortunately this means
 that one cannot use vnd with files that live in file systems that do
 not support these operations such as, for example, tmpfs or smbfs.
 
 The attached patch makes vnd use the regular VOP_READ and VOP_WRITE
 operations iff bmap/strategy are _not_ available (how this is
 currently determined is quite ugly but keeps the changes
 self-contained for now).  I know (from the comments in vnd) that this
 is not optimal, but IMHO it's better to have vnd working* than to
 worry about some minor issues.  (Implementing bmap/strategy for some
 file systems doesn't seem trivial nor makes much sense I think.)
 
 * Yes, using vnd with files in tmpfs is useful (as well as over
 smbfs).  I can show you some use cases if you want them.
 
 Comments please?
 
 Thanks.
 
 -- 
 Julio M. Merino Vidal <jmmv84@gmail.com>
 The Julipedia - http://julipedia.blogspot.com/
 
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