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From:   Ritesh Harjani <riteshh@linux.ibm.com>
To:     fstests@vger.kernel.org
Cc:     guan@eryu.me, anju@linux.vnet.ibm.com, lists@nerdbynature.de,
        linux-ext4@vger.kernel.org, Ritesh Harjani <riteshh@linux.ibm.com>
Subject: [PATCHv3 1/1] generic: Add test to check for mounting a huge sparse dm device
Date:   Wed,  9 Dec 2020 09:33:41 +0530
Message-Id: <4e4755473e28f8d662bc709b909e25cab0785604.1607486295.git.riteshh@linux.ibm.com>
MIME-Version: 1.0
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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

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

[ 1461.988701] run fstests generic/613 at 2020-10-27 19:57:34
[ 1530.406645] ------------[ cut here ]------------
[ 1530.407332] would truncate bmap result
[ 1530.408956] WARNING: CPU: 0 PID: 6401 at fs/iomap/fiemap.c:116
iomap_bmap_actor+0x43/0x50
[ 1530.410607] Modules linked in:
[ 1530.411024] CPU: 0 PID: 6401 Comm: mount Tainted: G        W
<...>
 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@linux.ibm.com>
---
v2->v3: Addressed review comments from Eryu [1]
[1]: https://patchwork.kernel.org/patch/11951463
 common/rc             | 31 ++++++++++++++++++++++
 tests/generic/620     | 62 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/620.out |  3 +++
 tests/generic/group   |  1 +
 4 files changed, 97 insertions(+)
 create mode 100755 tests/generic/620
 create mode 100644 tests/generic/620.out

diff --git a/common/rc b/common/rc
index 5911a6c89a78..33b5b598a198 100644
--- a/common/rc
+++ b/common/rc
@@ -1608,6 +1608,37 @@ _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"
+}
+
+# require scratch fs which supports >16T of filesystem size.
+_require_scratch_16T_support()
+{
+	case $FSTYP in
+	ext2|ext3|f2fs)
+		_notrun "$FSTYP doesn't support >16T filesystem"
+		;;
+	ext4)
+		_scratch_mkfs >> $seqres.full 2>&1
+		_scratch_mount
+		local blocksize=$(_get_block_size $SCRATCH_MNT)
+		if [ $blocksize -lt 4096 ]; then
+			_notrun "This test requires >16T fs support"
+		fi
+		_scratch_unmount
+		;;
+	*)
+		;;
+	esac
+}

 # this test needs a test partition - check we're ok & mount it
 #
diff --git a/tests/generic/620 b/tests/generic/620
new file mode 100755
index 000000000000..ad63fa9ab4e6
--- /dev/null
+++ b/tests/generic/620
@@ -0,0 +1,62 @@
+#! /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/620
+#
+# 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_scratch_16T_support
+_require_scratch_size_nocheck $((4 * 1024 * 1024)) #kB
+_require_dmhugedisk
+
+# 17TB dm huge-test-zer0 device
+# (in terms of 512 sectors)
+sectors=$((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/620.out b/tests/generic/620.out
new file mode 100644
index 000000000000..9a51e9e2cb8c
--- /dev/null
+++ b/tests/generic/620.out
@@ -0,0 +1,3 @@
+QA output created by 620
+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 15a2f40e2520..d8758d7f6a5f 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -622,3 +622,4 @@
 617 auto rw io_uring stress
 618 auto quick attr
 619 auto rw enospc
+620 auto mount quick
--
2.26.2