btrfs-progs: tests: add 005-long-device-name-for-ssd

A test for "btrfs-progs: mkfs: increase buffer size in is_ssd". Create a
device with a long name through loop device wrapped to a device mapper
linear device, switch it to the "ssd" mode status.

Signed-off-by: David Sterba <dsterba@suse.com>

tests/mkfs-tests/005-long-device-name-for-ssd/test.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# a long device name must pass the SSD test
+
+source $TOP/tests/common
+
+check_prereq mkfs.btrfs
+check_prereq btrfs
+setup_root_helper
+prepare_test_dev
+
+# prep device
+dmname=\
+btrfs-test-with-very-long-name-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+dmdev=/dev/mapper/$dmname
+
+run_check truncate -s0 img
+chmod a+w img
+run_check truncate -s2g img
+
+loopdev=`run_check_stdout $SUDO_HELPER losetup --find --show img`
+run_check $SUDO_HELPER dmsetup create $dmname --table "0 1048576 linear $loopdev 0"
+
+base=`basename "$loopdev"`
+rot=/sys/class/block/$base/queue/rotational
+
+# switch rotational
+run_check cat $rot
+echo 0 | run_check $SUDO_HELPER tee $rot
+run_check cat $rot
+
+# test
+run_check_stdout $SUDO_HELPER $TOP/mkfs.btrfs -f $@ $dmdev |
+	grep -q 'SSD detected:.*yes' || _fail 'SSD not detected'
+run_check $TOP/btrfs-show-super $dmdev
+
+# cleanup
+run_check $SUDO_HELPER dmsetup remove $dmname
+run_mayfail $SUDO_HELPER losetup -d $loopdev
+run_check truncate -s0 img