umounting partitions after heavy activity would sometimes trigger a
segmentation violation.  This fix appears to remove that problem.
Fix originally provided by Latchesar Ionkov.
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>

If trans->write returns 0, p9_write_work goes through the error path, but
sets the error code to zero.

This patch sets the error code to EREMOTEIO if trans->write returns zero
value.
Signed-off-by: NLatchesar Ionkov <lucho@ionkov.net>

Change module name of net/9p module from 9p.ko to 9pnet.ko. fs/9p module
already uses 9p.ko name.
Signed-off-by: NLatchesar Ionkov <lucho@ionkov.net>

This patchset moves non-filesystem interfaces of v9fs from fs/9p to net/9p.
It moves the transport, packet marshalling and connection layers to net/9p
leaving only the VFS related files in fs/9p.  This work is being done in
preparation for in-kernel 9p servers as well as alternate 9p clients (other
than VFS).
Signed-off-by: NLatchesar Ionkov <lucho@ionkov.net>
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>