[PATCH] xfstests: fix btrfs/265 so it actually works V2

[Josef Bacik <jbacik@fusionio.com>]

There are a few problems with btrfs/265.  First we don't redirect the output of
btrfs fi ba somwhere else, so we fail this test outright.  Secondly if you have
less than 4 devices in your scratch dev pool it won't work because you can't
mkfs raid10 without 4 devices.  This is all impossible to figure out at first
glance because the test redirects all output to /dev/null.  So do a few things

1) Redirect all output to $seqres.full to help the next poor sap who finds a
problem.

2) Add an optional option for _require_scratch_dev_pool to specify the minimum
number of devices required to run the test, so you get a nice helpful error
instead of "mkfs failed" in $seqres.full if you don't specify enough devices in
your scratch dev pool.

3) Redirect the output from btrfs fi ba to $seqres.full instead of letting its
output go to stdout and making the test fail anyways.

With these changes this test now passes for me.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---
V1->V2:
-when testing this I had actually had 5 devices in my dev pool so it still
 worked, but when I had 4 devices it failed because we strip out the first
 device for $SCRATCH_DEV, so fix the math to take this into account and now it
 works properly

 common/rc       |   16 +++++++++++++---
 tests/btrfs/265 |   30 ++++++++++++++++--------------
 2 files changed, 29 insertions(+), 17 deletions(-)

diff --git a/common/rc b/common/rc
index fe6bbfc..2a1b494 100644
--- a/common/rc
+++ b/common/rc
@@ -1964,10 +1964,15 @@ _test_inode_extsz()
     echo $blocks
 }
 
-# scratch_dev_pool should contain the disks pool for the btrfs raid
+# scratch_dev_pool should contain the disks pool for the btrfs raid, optionally
+# you can provide the minimum number of devices required for this test
 _require_scratch_dev_pool()
 {
 	local i
+	local _count=2
+
+	[ $# -eq 1 ] && _count=$1
+
 	if [ -z "$SCRATCH_DEV_POOL" ]; then
 		_notrun "this test requires a valid \$SCRATCH_DEV_POOL"
 	fi
@@ -1976,8 +1981,13 @@ _require_scratch_dev_pool()
 	# so fail it
 	case $FSTYP in
 	btrfs)
-		if [ "`echo $SCRATCH_DEV_POOL|wc -w`" -lt 2 ]; then
-			_notrun "btrfs and this test needs 2 or more disks in SCRATCH_DEV_POOL"
+		# SCRATCH_DEV_POOL by the time it gets here has had SCRATCH_DEV
+		# peeled off of it, so we need to add the scratch dev to the
+		# count.
+		local _disk_count=$(echo $SCRATCH_DEV_POOL | wc -w)
+		_disk_count=$(expr $_disk_count + 1)
+		if [ $_disk_count -lt $_count ]; then
+			_notrun "btrfs and this test needs $_count or more disks in SCRATCH_DEV_POOL"
 		fi
 	;;
 	*)
diff --git a/tests/btrfs/265 b/tests/btrfs/265
index 79a9ddf..fcf5730 100755
--- a/tests/btrfs/265
+++ b/tests/btrfs/265
@@ -49,14 +49,16 @@ _need_to_be_root
 _supported_fs btrfs
 _supported_os Linux
 _require_scratch
-_require_scratch_dev_pool
+_require_scratch_dev_pool 4
 _require_deletable_scratch_dev_pool
 
+rm -f $seqres.full
+
 # Test cases related to raid in btrfs
 _test_raid0()
 {
 	export MKFS_OPTIONS="-m raid0 -d raid0"
-	_scratch_mkfs $SCRATCH_DEV_POOL > /dev/null 2>&1 || _fail "mkfs failed"
+	_scratch_mkfs $SCRATCH_DEV_POOL >> $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
@@ -66,7 +68,7 @@ _test_raid0()
 _test_raid1()
 {
 	export MKFS_OPTIONS="-m raid1 -d raid1"
-	_scratch_mkfs $SCRATCH_DEV_POOL > /dev/null 2>&1 || _fail "mkfs failed"
+	_scratch_mkfs $SCRATCH_DEV_POOL >> $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
@@ -76,7 +78,7 @@ _test_raid1()
 _test_raid10()
 {
 	export MKFS_OPTIONS="-m raid10 -d raid10"
-	_scratch_mkfs $SCRATCH_DEV_POOL > /dev/null 2>&1 || _fail "mkfs failed"
+	_scratch_mkfs $SCRATCH_DEV_POOL >> $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
@@ -86,7 +88,7 @@ _test_raid10()
 _test_single()
 {
 	export MKFS_OPTIONS="-m single -d single"
-	_scratch_mkfs $SCRATCH_DEV_POOL > /dev/null 2>&1 || _fail "mkfs failed"
+	_scratch_mkfs $SCRATCH_DEV_POOL >> $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 $dirp -s 10
@@ -102,14 +104,14 @@ _test_add()
 	n=$(($n-1))
 
 	export MKFS_OPTIONS=""
-	_scratch_mkfs > /dev/null 2>&1 || _fail "mkfs failed"
+	_scratch_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
 	for i in `seq 1 $n`; do
-		$BTRFS_UTIL_PROG device add ${devs[$i]} $SCRATCH_MNT > /dev/null 2>&1 || _fail "device add failed"
+		$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 || _fail "balance failed"
+	$BTRFS_UTIL_PROG filesystem balance $SCRATCH_MNT >> $seqres.full || _fail "balance failed"
 	umount $SCRATCH_MNT
 }
 
@@ -127,7 +129,7 @@ _test_replace()
 	ds=${devs[@]:0:$n}
 
 	export MKFS_OPTIONS="-m raid1 -d raid1"
-	_scratch_mkfs "$ds" > /dev/null 2>&1 || _fail "tr: mkfs failed"
+	_scratch_mkfs "$ds" >> $seqres.full 2>&1 || _fail "tr: mkfs failed"
 	_scratch_mount
 	dirp=`mktemp -duq $SCRATCH_MNT/dir.XXXXXX`
 	_populate_fs -n 1 -f 20 -d 10 -r $dirp -s 10
@@ -143,16 +145,16 @@ _test_replace()
 	_devmgt_remove ${DEVHTL}
 	dev_removed=1
 
-	$BTRFS_UTIL_PROG fi show $SCRATCH_DEV | grep "Some devices missing" > /dev/null || _fail \
+	$BTRFS_UTIL_PROG fi show $SCRATCH_DEV | grep "Some devices missing" >> $seqres.full || _fail \
 							"btrfs did not report device missing"
 
 	# add a new disk to btrfs
 	ds=${devs[@]:$(($n)):1}
-	$BTRFS_UTIL_PROG device add ${ds} $SCRATCH_MNT > /dev/null 2>&1 || _fail "dev add failed"
+	$BTRFS_UTIL_PROG device add ${ds} $SCRATCH_MNT >> $seqres.full 2>&1 || _fail "dev add failed"
 	# in some system balance fails if there is no delay (a bug)
 	# putting sleep 10 to work around as of now
 	# sleep 10
-	$BTRFS_UTIL_PROG filesystem balance $SCRATCH_MNT || _fail "dev balance failed"
+	$BTRFS_UTIL_PROG filesystem balance $SCRATCH_MNT >> $seqres.full 2>&1 || _fail "dev balance failed"
 
 	# cleaup. add the removed disk
 	umount $SCRATCH_MNT
@@ -162,7 +164,7 @@ _test_replace()
 
 _test_remove()
 {
-	_scratch_mkfs "$SCRATCH_DEV_POOL" > /dev/null 2>&1 || _fail "mkfs failed"
+	_scratch_mkfs "$SCRATCH_DEV_POOL" >> $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
@@ -170,7 +172,7 @@ _test_remove()
 	# pick last dev in the list
 	dev_del=`echo ${SCRATCH_DEV_POOL} | awk '{print $NF}'`
 	$BTRFS_UTIL_PROG device delete $dev_del $SCRATCH_MNT || _fail "btrfs device delete failed"
-	$BTRFS_UTIL_PROG filesystem show $SCRATCH_DEV 2>&1 | grep $dev_del > /dev/null && _fail "btrfs still shows the deleted dev"
+	$BTRFS_UTIL_PROG filesystem show $SCRATCH_DEV 2>&1 | grep $dev_del >> $seqres.full && _fail "btrfs still shows the deleted dev"
 	umount $SCRATCH_MNT
 }
 
-- 
1.7.7.6