[PATCH V2] common/rc: explicitly test for engine availability in _require_fio

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The current test in _require_fio (--warnings-fatal --showcmd) does not
fail if an invalid/unavailable io engine is specified.

Add an explicit test that every requested io engine in the job file
is actually available.

Remove the "ioe_e4defrag" entries in ext4 tests - an engine with this
name has seemingly never existed, but in each case later stanzas
overrode the io engine, so it did not cause problems without this
explicit parsing and checking.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---

V2: Be Better at Bash, thanks Zorro. Also add | sort | uniq to ensure
    we only test each requested engine once.

diff --git a/common/rc b/common/rc
index ca755055..ac443ec2 100644
--- a/common/rc
+++ b/common/rc
@@ -3977,12 +3977,19 @@ _require_scratch_dev_pool_equal_size()
 _require_fio()
 {
 	local job=$1
+	local eng
 
 	_require_command "$FIO_PROG" fio
 	if [ -z "$1" ]; then
 		return 1;
 	fi
 
+	# Explicitly check for every ioengine listed in the job
+	for eng in `sed -n "s/ioengine=\(.*\)/\1/p" $job | sort | uniq`; do
+		grep -wq $eng <($FIO_PROG --enghelp 2>/dev/null) || \
+			_notrun "fio engine $eng not available"
+	done
+
 	$FIO_PROG --warnings-fatal --showcmd $job >> $seqres.full 2>&1
 	[ $? -eq 0 ] || _notrun "$FIO_PROG too old, see $seqres.full"
 }
diff --git a/tests/ext4/301 b/tests/ext4/301
index abf47d4b..a05b8e8a 100755
--- a/tests/ext4/301
+++ b/tests/ext4/301
@@ -31,7 +31,6 @@ FILE_SIZE=$((BLK_DEV_SIZE * (512 / (2 + 1))))
 cat >$fio_config <<EOF
 # Common e4defrag regression tests
 [global]
-ioengine=ioe_e4defrag
 iodepth=1
 directory=${SCRATCH_MNT}
 filesize=${FILE_SIZE}
diff --git a/tests/ext4/302 b/tests/ext4/302
index 87820184..e0f5f2f9 100755
--- a/tests/ext4/302
+++ b/tests/ext4/302
@@ -31,7 +31,6 @@ FILE_SIZE=$((BLK_DEV_SIZE * (512 / (2 + 1))))
 cat >$fio_config <<EOF
 # Common e4defrag regression tests
 [global]
-ioengine=ioe_e4defrag
 iodepth=1
 directory=${SCRATCH_MNT}
 filesize=${FILE_SIZE}
diff --git a/tests/ext4/303 b/tests/ext4/303
index 2381f047..0a83e86c 100755
--- a/tests/ext4/303
+++ b/tests/ext4/303
@@ -31,7 +31,6 @@ FILE_SIZE=$((BLK_DEV_SIZE * (512 / (3+1))))
 cat >$fio_config <<EOF
 # Common e4defrag regression tests
 [global]
-ioengine=ioe_e4defrag
 iodepth=1
 directory=${SCRATCH_MNT}
 filesize=${FILE_SIZE}
diff --git a/tests/ext4/304 b/tests/ext4/304
index 53b522ee..5f2ae4bd 100755
--- a/tests/ext4/304
+++ b/tests/ext4/304
@@ -32,7 +32,6 @@ FILE_SIZE=$((BLK_DEV_SIZE * (512 / (2 + 1))))
 cat >$fio_config <<EOF
 # Common e4defrag regression tests
 [global]
-ioengine=ioe_e4defrag
 iodepth=1
 directory=${SCRATCH_MNT}
 filesize=${FILE_SIZE}





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