ZTS: Test case failures

* devices/devices_001_pos, devices/devices_002_neg - When only NVMe
  block devices exist no valid major/minor are found.  Update the
  create_dev_file_linux function to handle this case.

* large_dnode_008_pos - Force a pool sync before invoking zdb to
  ensure the updated dnode blocks have been persistented to disk.

* refreserv_raidz - Wait for the /dev/zvol links to be both created
  and removed, this is important because the same device volume
  names are being used repeatedly.

* btree_test - Add missing .gitignore file for btree_test binary.

Signed-off-by: Brian Behlendorf <[email protected]>

tests/zfs-tests/cmd/btree_test/.gitignore

@@ -0,0 +1 @@
+/btree_test

tests/zfs-tests/tests/functional/devices/devices_common.kshlib

@@ -209,9 +209,9 @@ function create_dev_file_linux
 
 	case $filetype in
 	b)
-		major=$(awk '/[hsv]d/ { print $1; exit }' \
+		major=$(awk '/([hsv]d|nvme*)/ { print $1; exit }' \
 		    /proc/partitions)
-		minor=$(awk '/[hsv]d/ { print $2; exit }' \
+		minor=$(awk '/([hsv]d|nvme*)/ { print $2; exit }' \
 		    /proc/partitions)
 		log_must mknod $filename b $major $minor
 		;;

tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_008_pos.ksh

@@ -39,7 +39,7 @@ verify_runnable "both"
 
 function cleanup
 {
-	datasetexists $TEST_FS && log_must zfs destroy $TEST_FS
+	datasetexists $TEST_FS && destroy_dataset $TEST_FS
 }
 
 function verify_dnode_packing
@@ -71,6 +71,7 @@ for ((i=0; i < 100; i++)); do
 done
 
 log_must wait
+sync_pool $TESTPOOL
 
 verify_dnode_packing
 

tests/zfs-tests/tests/functional/refreserv/refreserv_raidz.ksh

@@ -121,6 +121,7 @@ for parity in 1 2 3; do
 			log_must test "$deltapct" -le $maxpct
 
 			log_must_busy zfs destroy "$vol"
+			block_device_wait
 		done
 
 		log_must_busy zpool destroy "$TESTPOOL"