overlay: test concurrent copy up

Run 4 process pairs, each competing over copy up of 1K files
in 1 directory. One opponent touches all files in the directory
and the other truncates all files in the directory.

This test does NOT check for concurrent copy up support. It only
fails on unexpected errors of any of the touch/truncate operations.

The test full output should demonstrate the expected results -
for kernel with concurrent copy up support, truncate workers are
not delayed by touch workers. As a result, truncate workers will
finish their work much sooner than a test run without concurrent
copy up support.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

diff --git a/tests/overlay/021 b/tests/overlay/021
new file mode 100755 (executable)
index 0000000..c79bb01
--- /dev/null
+++ b/tests/overlay/021
@@ -0,0 +1,135 @@
+#! /bin/bash
+# FS QA Test 021
+#
+# Test concurrent copy up
+#
+#-----------------------------------------------------------------------
+# Copyright (C) 2016 CTERA Networks. All Rights Reserved.
+# Author: Amir Goldstein <amir73il@gmail.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"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1       # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+       cd /
+       rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs overlay
+_supported_os Linux
+_require_scratch
+
+# Remove all files from previous tests
+_scratch_mkfs
+
+# overlay copy_up doesn't deal with sparse file well, holes will be filled by
+# zeros, so for the worst case of hitting all the copy up bomb files, we need
+# (64*(16+32+64+128)M) free space on $SCRATCH_DEV.
+# However, triggering more than a total of 16 copy up bombs would require
+# really fast data copy (clone up doesn't take up space at all), so let's be
+# conservative and reserve space for 16 data copy ups per directory.
+_require_fs_space $SCRATCH_DEV $((16*(16+32+64+128)*1024))
+
+lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+mkdir -p $lowerdir
+
+testdir=arena
+d_low=$lowerdir/$testdir
+mkdir -p $d_low
+
+# Create 4K empty files in 4 directories
+echo $FSSTRESS_PROG -d $d_low -p 4 -z -f creat=1 -n 1024 -v >> $seqres.full
+$FSSTRESS_PROG -d $d_low -p 4 -z -f creat=1 -n 1024 -v >> $seqres.full 2>&1
+echo "--------------------------------------"       >> $seqres.full
+echo "Created 1K files in lower directory.  "       >> $seqres.full
+
+# Plant 64 copy up bombs in each directory
+for f in $d_low/p0/*0; do $XFS_IO_PROG -c "truncate 128m" $f ;done
+for f in $d_low/p1/*4; do $XFS_IO_PROG -c "truncate 64m" $f ;done
+for f in $d_low/p2/*8; do $XFS_IO_PROG -c "truncate 32m" $f ;done
+for f in $d_low/p3/*b; do $XFS_IO_PROG -c "truncate 16m" $f ;done
+echo "Created 64*4 copy up bombs.           "       >> $seqres.full
+echo "--------------------------------------"       >> $seqres.full
+
+_scratch_mount
+
+d_top=$SCRATCH_MNT/$testdir
+
+#
+# Run 2 process teams - 4 pairs of rival processes
+# Each process pair competing on copy up of 1K files in 1 directory.
+# Team 'touch' players touch all files in readdir order.
+# Team 'truncate' players truncates all files in numeric (name) order.
+#
+# If player from team 'touch' reaches a copy up bomb before player
+# from team 'truncate' does, the copy up of (sparse) data will delay
+# the end of the process pair match.
+#
+# If copy up of bomb is not concurrent with other copy ups, then
+# 'touch' player p0 with the largest copy up bombs will delay players
+# of both teams and all matches will take longer.
+#
+# If copy up is concurrent with copy ups in different directories,
+# process pair 3 match will be over first and process pair 0 match
+# will be over last.
+#
+# If copy up of data is concurrent with other copy ups on the same directory,
+# then all the 'touch' team players will finish far behind their 'truncate'
+# opponenets.
+#
+# This test doesn't verify any of those conditions, it will only fail
+# on unexpected errors of any of the touch/truncate operations.
+# The test full output should demonstrate the expected game results,
+# as described above and depending on concurrent copy up support in kernel.
+#
+cd $d_top
+echo "--------------------------------------"       >> $seqres.full
+echo "Go team touch!!                       "       >> $seqres.full
+find p0 -type f -print -exec touch {} \; >> $seqres.full &
+find p1 -type f -print -exec touch {} \; >> $seqres.full &
+find p2 -type f -print -exec touch {} \; >> $seqres.full &
+find p3 -type f -print -exec touch {} \; >> $seqres.full &
+cd - > /dev/null
+
+echo "--------------------------------------"       >> $seqres.full
+echo "Go team truncate!!                    "       >> $seqres.full
+# Give team 'touch' a 1 second head start.
+# Team 'truncate' players should catch up after few copy up bombs.
+sleep 1
+$FSSTRESS_PROG -d $d_top -p 4 -z -f creat=1 -n 1024 -v >> $seqres.full &
+
+wait %1 %2 %3 %4 %5
+
+echo "Silence is golden"
+status=0
+exit

diff --git a/tests/overlay/021.out b/tests/overlay/021.out
new file mode 100644 (file)
index 0000000..09f4062
--- /dev/null
+++ b/tests/overlay/021.out
@@ -0,0 +1,2 @@
+QA output created by 021
+Silence is golden

diff --git a/tests/overlay/group b/tests/overlay/group
index 684ed452a4f343bd5da636654e3eed0822668886..5bcc25e945dec440424e40f86cfe8efd234f7550 100644 (file)
--- a/tests/overlay/group
+++ b/tests/overlay/group
@@ -23,3 +23,4 @@
 018 auto quick copyup
 019 auto stress
 020 auto quick copyup perms
+021 auto quick copyup