devmnt: handle rpc buffer exhaustion on mntflushalloc()

this bug happens when the kernel runs out of mount rpc
buffers when allocating a flush rpc. in this case, mntflushalloc()
will errorjump out of mountio() leaving the currently in
flight rpc in the mount. the caller of mountrpc()/mountio()
frees the rpc thats still queued in the mount leaving
to interesting results.

for the fix, we add a waserror() arround mntflushalloc() and
handle the error case like a mount rpc failure which will
properly dequeue the rpc's in flight.

0 files changed, 0 insertions, 0 deletions