[PATCH] btrfs/145: Test various btrfs operations rounding behavior

[Nikolay Borisov <nborisov@suse.com>]

When changing the size of disks/filesystem we should always be
rounding down to a multiple of sectorsize. This is a test for the following
btrfs patche: 

btrfs: Round up values which are written for total_bytes_size

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
 tests/btrfs/145     | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/btrfs/145.out |  20 +++++++
 tests/btrfs/group   |   1 +
 3 files changed, 168 insertions(+)
 create mode 100755 tests/btrfs/145
 create mode 100644 tests/btrfs/145.out

diff --git a/tests/btrfs/145 b/tests/btrfs/145
new file mode 100755
index 0000000..4461b37
--- /dev/null
+++ b/tests/btrfs/145
@@ -0,0 +1,147 @@
+#! /bin/bash
+# FS QA Test No. btrfs/145
+# 
+# Test that various code paths which deal with modifying the total size
+# of devices/superblock correctly round the value to a multiple of 
+# sector size
+#
+#-----------------------------------------------------------------------
+#
+# Copyright (C) 2017 SUSE Linux Products GmbH. All Rights Reserved.
+# Author: Nikolay Borisov <nborisov@suse.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	$UMOUNT_PROG $loop_mnt 
+	_destroy_loop_device $loop_dev1
+	_destroy_loop_device $loop_dev2
+	cd /
+	rm -f $tmp.*
+	
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs btrfs
+_supported_os Linux
+_require_scratch
+_require_loop
+_require_block_device $SCRATCH_DEV
+
+rm -f $seqres.full
+
+_scratch_mkfs >>$seqres.full 2>&1
+_scratch_mount
+
+
+#Size of devices which are going to be half a page larger than 
+#default sectorsize (4kb)
+expectedsize=$(( 1 * 1024 * 1024 * 1024 )) 
+filesize=$(( $expectedsize + 2048 ))
+loop_mnt=$SCRATCH_MNT/mount
+fs_img1=$SCRATCH_MNT/disk1.img
+fs_img2=$SCRATCH_MNT/disk2.img
+
+mkdir $loop_mnt
+
+#create files to hold dummy devices
+$XFS_IO_PROG -f -c "falloc 0 $filesize" $fs_img1 &> /dev/null
+$XFS_IO_PROG -f -c "falloc 0 $filesize" $fs_img2 &> /dev/null
+
+loop_dev1=$(_create_loop_device $fs_img1)
+loop_dev2=$(_create_loop_device $fs_img2) 
+
+#create fs only on the first device
+_mkfs_dev $loop_dev1 
+_mount $loop_dev1 $loop_mnt
+
+echo "Size from mkfs"
+$BTRFS_UTIL_PROG inspect-internal dump-super /dev/loop0 | grep total
+
+#resize down to 768mb + 2k
+$BTRFS_UTIL_PROG fi resize 824182784 $loop_mnt >>$seqres.full 2>&1 
+sync
+
+echo ""
+
+echo "Size after resizing down"
+$BTRFS_UTIL_PROG inspect-internal dump-super $loop_dev1 | grep total
+
+echo ""
+
+#now resize back up to 1 gb
+$BTRFS_UTIL_PROG fi resize max $loop_mnt >>$seqres.full 2>&1 
+sync
+
+echo "Size after resizing up"
+$BTRFS_UTIL_PROG inspect-internal dump-super /dev/loop0 | grep total
+
+#Add fs load for later balance operations, we need to do this 
+#before adding a second device
+$FSSTRESS_PROG -w -n 15000 -p 2 -d $loop_mnt >> $seqres.full 2>&1
+
+#add second unaligned device, this checks the btrfs_init_new_device codepath 
+#device should be aligned
+$BTRFS_UTIL_PROG device add $loop_dev2 $loop_mnt >>$seqres.full 2>&1
+sync
+
+echo ""
+
+#Ensure that adding a device doesn't cause the superbock to be
+#unaligned
+echo "Size of superblock after device addition"
+$BTRFS_UTIL_PROG inspect-internal dump-super $loop_dev1 | grep total
+
+echo ""
+
+#The newly added device must also be aligned
+echo "Size of superblock/device for second device"
+$BTRFS_UTIL_PROG inspect-internal dump-super $loop_dev2 | grep total
+
+#now start a balance, this might produce warnings while
+#it's relocating chunks and updating the size of devices
+$BTRFS_UTIL_PROG balance start $loop_mnt >> $seqres.full 2>&1
+sync
+
+#delete everything and then run balance
+rm -rf $loop_mnt/*
+
+#do a bit more stress testing until we fill the fs 
+$FSSTRESS_PROG -w -n 15000 -p 4 -d $loop_mnt >> $seqres.full 2>&1
+rm -rf $loop_mnt/p0 $loop_mnt/p2
+
+#run balance again, this time we will be freeing chunks 
+$BTRFS_UTIL_PROG balance start $loop_mnt >> $seqres.full 2>&1
+sync
+
+#Warnings are produced if we try to store unaligned values
+_check_dmesg
+
+status=$?
+exit
diff --git a/tests/btrfs/145.out b/tests/btrfs/145.out
new file mode 100644
index 0000000..7340db2
--- /dev/null
+++ b/tests/btrfs/145.out
@@ -0,0 +1,20 @@
+QA output created by 145
+Size from mkfs
+total_bytes		1073741824
+dev_item.total_bytes	1073741824
+
+Size after resizing down
+total_bytes		824180736
+dev_item.total_bytes	824180736
+
+Size after resizing up
+total_bytes		1073741824
+dev_item.total_bytes	1073741824
+
+Size of superblock after device addition
+total_bytes		2147483648
+dev_item.total_bytes	1073741824
+
+Size of superblock/device for second device
+total_bytes		2147483648
+dev_item.total_bytes	1073741824
diff --git a/tests/btrfs/group b/tests/btrfs/group
index be05487..6c930d4 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -147,3 +147,4 @@
 142 auto quick
 143 auto quick
 144 auto quick send
+145 auto quick
-- 
2.7.4