[PATCH V4] xfstests: don't remove the two first devices from SCRATCH_DEV_POOL

[Stefan Behrens <sbehrens@giantdisaster.de>]

Since common/config is executed twice, if SCRATCH_DEV_POOL is configured
via the environment, the current code removes the first device entry twice
which means that you lose the second device for the test.

The fix is to not remove anything from SCRATCH_DEV_POOL anymore.
That used to be done (I can only guess) to allow to pass the
SCRATCH_DEV_POOL as an argument to _scratch_mkfs. Since _scratch_mkfs adds
the SCRATCH_DEV, the pool mustn't contain that device anymore.

A new function _scratch_pool_mkfs is introduced that does the expected
thing.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
---
V1 -> V2:
- rebased.
- fixed a missing adaption to the new way to deal with SCRATCH_DEV_POOL
  in  _test_replace() in tests/btrfs/003.

V2 -> V3:
- V2 was the result of a git rebase mistake (a user error), forget it,
  sorry. V3 now contains the correct fix for a missing adaption to the
  new way to deal with SCRATCH_DEV_POOL in _test_replace() in
  tests/btrfs/003.

V3 -> V4:
- rebased, because it didn't apply cleanly anymore today.

 common/config   |  1 -
 common/rc       | 12 ++++++++++++
 tests/btrfs/002 |  3 ++-
 tests/btrfs/003 | 16 ++++++++--------
 tests/btrfs/006 |  4 ++--
 5 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/common/config b/common/config
index 39dd469..586870b 100644
--- a/common/config
+++ b/common/config
@@ -267,7 +267,6 @@ get_next_config() {
 			exit 1
 		fi
 		SCRATCH_DEV=`echo $SCRATCH_DEV_POOL | awk '{print $1}'`
-		SCRATCH_DEV_POOL=`echo $SCRATCH_DEV_POOL | awk '{ ORS=" "; for (i = 2; i <= NF; i++) print $i}'`
 	fi
 
 	echo $SCRATCH_DEV | grep -q ":" > /dev/null 2>&1
diff --git a/common/rc b/common/rc
index ae80b12..77e96c4 100644
--- a/common/rc
+++ b/common/rc
@@ -550,6 +550,18 @@ _scratch_mkfs()
     esac
 }
 
+_scratch_pool_mkfs()
+{
+    case $FSTYP in
+    btrfs)
+	$MKFS_BTRFS_PROG $MKFS_OPTIONS $* $SCRATCH_DEV_POOL > /dev/null
+	;;
+    *)
+	echo "_scratch_pool_mkfs is not implemented for $FSTYP" 1>&2
+	;;
+    esac
+}
+
 # Create fs of certain size on scratch device
 # _scratch_mkfs_sized <size in bytes> [optional blocksize]
 _scratch_mkfs_sized()
diff --git a/tests/btrfs/002 b/tests/btrfs/002
index 03e9137..f4389ae 100755
--- a/tests/btrfs/002
+++ b/tests/btrfs/002
@@ -45,8 +45,9 @@ _need_to_be_root
 _supported_fs btrfs
 _supported_os Linux
 _require_scratch
+_require_scratch_dev_pool
 
-_scratch_mkfs $SCRATCH_DEV_POOL > /dev/null 2>&1 || _fail "mkfs failed"
+_scratch_pool_mkfs > /dev/null 2>&1 || _fail "mkfs failed"
 _scratch_mount
 
 # Create and save sha256sum
diff --git a/tests/btrfs/003 b/tests/btrfs/003
index 5c88651..262b1d5 100755
--- a/tests/btrfs/003
+++ b/tests/btrfs/003
@@ -58,7 +58,7 @@ rm -f $seqres.full
 _test_raid0()
 {
 	export MKFS_OPTIONS="-m raid0 -d raid0"
-	_scratch_mkfs $SCRATCH_DEV_POOL >> $seqres.full 2>&1 || _fail "mkfs failed"
+	_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
 	_scratch_mount
 	dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
 	_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
@@ -68,7 +68,7 @@ _test_raid0()
 _test_raid1()
 {
 	export MKFS_OPTIONS="-m raid1 -d raid1"
-	_scratch_mkfs $SCRATCH_DEV_POOL >> $seqres.full 2>&1 || _fail "mkfs failed"
+	_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
 	_scratch_mount
 	dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
 	_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
@@ -78,7 +78,7 @@ _test_raid1()
 _test_raid10()
 {
 	export MKFS_OPTIONS="-m raid10 -d raid10"
-	_scratch_mkfs $SCRATCH_DEV_POOL >> $seqres.full 2>&1 || _fail "mkfs failed"
+	_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
 	_scratch_mount
 	dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
 	_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
@@ -88,7 +88,7 @@ _test_raid10()
 _test_single()
 {
 	export MKFS_OPTIONS="-m single -d single"
-	_scratch_mkfs $SCRATCH_DEV_POOL >> $seqres.full 2>&1 || _fail "mkfs failed"
+	_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
 	_scratch_mount
 	dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
 	_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
@@ -108,7 +108,7 @@ _test_add()
 	_scratch_mount
 	dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
 	_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
-	for i in `seq 1 $n`; do
+	for i in `seq 2 $n`; do
 		$BTRFS_UTIL_PROG device add ${devs[$i]} $SCRATCH_MNT >> $seqres.full 2>&1 || _fail "device add failed"
 	done
 	$BTRFS_UTIL_PROG filesystem balance $SCRATCH_MNT >> $seqres.full 2>&1 || _fail "balance failed"
@@ -124,9 +124,9 @@ _test_replace()
 	local d
 	local DEVHTL=""
 
-	# exclude the last disk in the disk pool
+	# exclude the first and the last disk in the disk pool
 	n=$(($n-1))
-	ds=${devs[@]:0:$n}
+	ds=${devs[@]:1:$(($n-1))}
 
 	export MKFS_OPTIONS="-m raid1 -d raid1"
 	_scratch_mkfs "$ds" >> $seqres.full 2>&1 || _fail "tr: mkfs failed"
@@ -164,7 +164,7 @@ _test_replace()
 
 _test_remove()
 {
-	_scratch_mkfs "$SCRATCH_DEV_POOL" >> $seqres.full 2>&1 || _fail "mkfs failed"
+	_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
 	_scratch_mount
 	dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
 	_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
diff --git a/tests/btrfs/006 b/tests/btrfs/006
index 9f7beff..715fd80 100755
--- a/tests/btrfs/006
+++ b/tests/btrfs/006
@@ -53,12 +53,12 @@ rm -f $seqres.full
 
 FIRST_POOL_DEV=`echo $SCRATCH_DEV_POOL | awk '{print $1}'`
 LAST_POOL_DEV=`echo $SCRATCH_DEV_POOL | awk '{print $NF}'`
-TOTAL_DEVS=`echo $SCRATCH_DEV $SCRATCH_DEV_POOL | wc -w`
+TOTAL_DEVS=`echo $SCRATCH_DEV_POOL | wc -w`
 LABEL=TestLabel.$seq
 
 echo "Scratch $SCRATCH_DEV First $FIRST_POOL_DEV last $LAST_POOL_DEV Total $TOTAL_DEVS" > $seqres.full
 
-_scratch_mkfs $SCRATCH_DEV_POOL >> $seqres.full 2>&1 || _fail "mkfs failed"
+_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
 
 # These have to be done unmounted...?
 echo "== Set filesystem label to $LABEL"
-- 
1.8.3.4