Date:   Wed, 28 Oct 2020 12:14:52 +0530
From:   Ritesh Harjani <riteshh@...ux.ibm.com>
To:     fstests@...r.kernel.org
Cc:     Jan Kara <jack@...e.cz>, anju@...ux.vnet.ibm.com,
        Eryu Guan <guan@...u.me>,
        Christian Kujau <lists@...dbynature.de>,
        linux-ext4@...r.kernel.org, Ritesh Harjani <riteshh@...ux.ibm.com>
Subject: [PATCH 1/1] generic: Add test to check for mounting a huge sparse dm device

Add this test (which Christian Kujau reported) to check for regression
caused due to ext4 bmap aops implementation was moved to use iomap APIs.
jbd2 calls bmap() kernel function from fs/inode.c which was failing since
iomap_bmap() implementation earlier returned 0 for block addr > INT_MAX.
This regression was fixed with following kernel commit [1]
commit b75dfde1212991b24b220c3995101c60a7b8ae74
("fibmap: Warn and return an error in case of block > INT_MAX")
[1]: https://patchwork.ozlabs.org/patch/1279914

w/o the kernel fix we get below error and mount fails

[ 1461.988701] run fstests generic/613 at 2020-10-27 19:57:34
[ 1530.511978] jbd2_journal_init_inode: Cannot locate journal superblock
[ 1530.513310] EXT4-fs (dm-1): Could not load journal inode

Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>
---
 common/rc             | 10 +++++++
 tests/generic/613     | 66 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/613.out |  3 ++
 tests/generic/group   |  1 +
 4 files changed, 80 insertions(+)
 create mode 100755 tests/generic/613
 create mode 100644 tests/generic/613.out

diff --git a/common/rc b/common/rc
index 27a27ea36f75..b0c353c4c107 100644
--- a/common/rc
+++ b/common/rc
@@ -1607,6 +1607,16 @@ _require_scratch_size()
 	[ $devsize -lt $1 ] && _notrun "scratch dev too small"
 }

+# require a scratch dev of a minimum size (in kb) and should not be checked
+# post test
+_require_scratch_size_nocheck()
+{
+	[ $# -eq 1 ] || _fail "_require_scratch_size: expected size param"
+
+	_require_scratch_nocheck
+	local devsize=`_get_device_size $SCRATCH_DEV`
+	[ $devsize -lt $1 ] && _notrun "scratch dev too small"
+}

 # this test needs a test partition - check we're ok & mount it
 #
diff --git a/tests/generic/613 b/tests/generic/613
new file mode 100755
index 000000000000..b426ef91cacf
--- /dev/null
+++ b/tests/generic/613
@@ -0,0 +1,66 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020 Christian Kujau. All Rights Reserved.
+# Copyright (c) 2020 Ritesh Harjani. All Rights Reserved.
+#
+# FS QA Test generic/613
+#
+# Since the test is not specific to ext4, hence adding it to generic.
+# Add this test to check for regression which was reported when ext4 bmap
+# aops was moved to use iomap APIs. jbd2 calls bmap() kernel function
+# from fs/inode.c which was failing since iomap_bmap() implementation earlier
+# returned 0 for block addr > INT_MAX.
+# This regression was fixed with following kernel commit [1]
+# commit b75dfde1212991b24b220c3995101c60a7b8ae74
+# ("fibmap: Warn and return an error in case of block > INT_MAX")
+# [1]: https://patchwork.ozlabs.org/patch/1279914
+#
+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()
+{
+	_dmhugedisk_cleanup
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/dmhugedisk
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# Modify as appropriate.
+_supported_fs generic
+_require_dmhugedisk
+_require_scratch_size_nocheck $((4 * 1024 * 1024)) #kB
+
+# For 1k bs with ext4, mkfs was failing maybe due to size limitation.
+if [ "$FSTYP" = "ext4" ]; then
+	export MKFS_OPTIONS="-F -b 4096"
+fi
+
+# 17TB dm huge-test-zer0 device
+# (in terms of 512 sectors)
+sectors=$((2*1024*1024*1024*17))
+chunk_size=128
+
+_dmhugedisk_init $sectors $chunk_size
+_mkfs_dev $DMHUGEDISK_DEV
+_mount $DMHUGEDISK_DEV $SCRATCH_MNT || _fail "mount failed for $DMHUGEDISK_DEV $SCRATCH_MNT"
+testfile=$SCRATCH_MNT/testfile-$seq
+
+$XFS_IO_PROG -fc "pwrite -S 0xaa 0 1m" -c "fsync" $testfile | _filter_xfs_io
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/613.out b/tests/generic/613.out
new file mode 100644
index 000000000000..4747b7596499
--- /dev/null
+++ b/tests/generic/613.out
@@ -0,0 +1,3 @@
+QA output created by 613
+wrote 1048576/1048576 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
diff --git a/tests/generic/group b/tests/generic/group
index 8054d874f005..360d145d2036 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -615,3 +615,4 @@
 610 auto quick prealloc zero
 611 auto quick attr
 612 auto quick clone
+613 auto mount quick
--
2.26.2

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