generic: add testcase to test fallocate & f{data,}sync

f2fs can skip isize updating in fsync(), since during mount, f2fs
tries to recovery isize according to valid block address or
preallocated flag in last fsynced dnode block.

However, fallocate() breaks our rule with setting
FALLOC_FL_KEEP_SIZE flag, since it can preallocated block cross EOF,
once the file is fsynced, in POR, we will recover isize incorrectly
based on these fallocated blocks.

This patch adds a new testcase to test fallocate, in order to verify
whether filesystem will do correct recovery on isize.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/generic/468

@@ -0,0 +1,124 @@
+#! /bin/bash
+# FS QA Test 468
+#
+# This testcase is a fallocate variant of generic/392, it expands to test
+# block preallocation functionality of fallocate.
+# In this case, we are trying to execute:
+# 1. fallocate {,-k}
+# 2. f{data,}sync
+# 3. power-cuts
+# 4. recovery filesystem during mount
+# 5. check inode's metadata
+#
+# In the case of fsync, filesystem should recover all the inode metadata, while
+# recovering i_blocks and i_size at least for fdatasync, so this testcase excepts
+# that inode metadata will be unchanged after recovery.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Huawei.  All Rights Reserved.
+# Author: Chao Yu <yuchao0@huawei.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 generic
+_supported_os Linux
+
+_require_scratch
+_require_scratch_shutdown
+_require_xfs_io_command "falloc" "-k"
+
+_scratch_mkfs >/dev/null 2>&1
+_require_metadata_journaling $SCRATCH_DEV
+_scratch_mount
+
+testfile=$SCRATCH_MNT/testfile
+
+# check inode metadata after shutdown
+check_inode_metadata()
+{
+	sync_mode=$1
+
+	# fsync or fdatasync
+	if [ "$sync_mode" = "fsync" ]; then
+		stat_opt='-c "b: %b s: %s a: %x m: %y c: %z"'
+	else
+		stat_opt='-c "b: %b s: %s"'
+	fi
+
+	before=`stat "$stat_opt" $testfile`
+
+	$XFS_IO_PROG -c "$sync_mode" $testfile | _filter_xfs_io
+	$here/src/godown $SCRATCH_MNT | tee -a $seqres.full
+	_scratch_cycle_mount
+
+	after=`stat "$stat_opt" $testfile`
+
+	if [ "$before" != "$after" ]; then
+		echo "Before: $before"
+		echo "After : $after"
+	fi
+	echo "Before: $before" >> $seqres.full
+	echo "After : $after" >> $seqres.full
+	rm $testfile
+}
+
+# fallocate XX KB with f{data}sync, followed by power-cut
+test_falloc()
+{
+	# 4202496 = 4m + 8k
+	echo "==== falloc $2$3 test with $1 ====" | tee -a $seqres.full
+	$XFS_IO_PROG -f -c "truncate 4202496"	\
+			-c "pwrite 0 4202496"	\
+			-c "fsync"		\
+			-c "falloc $2 4202496 $3"\
+			$testfile >/dev/null
+	check_inode_metadata $1
+}
+
+for i in fsync fdatasync; do
+	test_falloc $i "" 1024
+	test_falloc $i "" 4096
+	test_falloc $i "" 104857600
+	test_falloc $i "-k " 1024
+	test_falloc $i "-k " 4096
+	test_falloc $i "-k " 104857600
+done
+
+status=0
+exit

tests/generic/468.out

@@ -0,0 +1,13 @@
+QA output created by 468
+==== falloc 1024 test with fsync ====
+==== falloc 4096 test with fsync ====
+==== falloc 104857600 test with fsync ====
+==== falloc -k 1024 test with fsync ====
+==== falloc -k 4096 test with fsync ====
+==== falloc -k 104857600 test with fsync ====
+==== falloc 1024 test with fdatasync ====
+==== falloc 4096 test with fdatasync ====
+==== falloc 104857600 test with fdatasync ====
+==== falloc -k 1024 test with fdatasync ====
+==== falloc -k 4096 test with fdatasync ====
+==== falloc -k 104857600 test with fdatasync ====

tests/generic/group

@@ -470,3 +470,4 @@
 465 auto rw quick aio
 466 auto quick rw
 467 auto quick exportfs
+468 shutdown auto quick metadata