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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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