ZFS: test property restore on error in zfs_ioc_recv

gistfile1.txt

#
# setup
export POOLNAME='testpool'
export TMPDIR='/var/tmp'
mountpoint -q $TMPDIR || mount -t tmpfs tmpfs $TMPDIR
zpool destroy $POOLNAME
fallocate -l 65m $TMPDIR/zpool.dat
zpool create $POOLNAME $TMPDIR/zpool.dat
zfs create $POOLNAME/send
zfs set compression=on $POOLNAME/send
zfs snap -r $POOLNAME/send@snap1
zfs send -R $POOLNAME/send@snap1 > $TMPDIR/snap_full.dat
zfs recv $POOLNAME/recv < $TMPDIR/snap_full.dat
#
# received compression is 'on'
zfs get -r -o all compression $POOLNAME/recv
zfs snap -r $POOLNAME/send@snap2
zfs snap -r $POOLNAME/send@snap3
zfs set compression=gzip-2 $POOLNAME/send
zfs send -RI $POOLNAME/send@snap1 $POOLNAME/send@snap2 > $TMPDIR/snap_incr1.dat
zfs set compression=gzip-3 $POOLNAME/send
zfs send -RI $POOLNAME/send@snap2 $POOLNAME/send@snap3 > $TMPDIR/snap_incr2.dat
#
# now receive incrementals
zfs recv -F $POOLNAME/recv < $TMPDIR/snap_incr1.dat
#
# received compression is 'gzip-2'
zfs get -r -o all compression $POOLNAME/recv
#
# inject err in zfs_ioc_recv_impl(), fail to receive incr with compression='gzip-3'
stap \
   -d kernel -d zfs -d spl \
   -g \
   -c bash -c "zfs recv -F $POOLNAME/recv < $TMPDIR/snap_incr2.dat" \
<(echo '
#!/usr/bin/env stap
probe module("zfs").function("zfs_ioc_recv_impl").call
{
   printf(" --> %s\n", probefunc());
   $zfs_ioc_recv_inject_err = 1;
}
')
# zfs receive failed, compression should be 'gzip-2' ... right?
zfs get -r -o all compression $POOLNAME/recv