linux-ext4 - [PATCHv3 4/4] generic/679: Add a test to check unwritten extents tracking

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Message-Id: <c9a40292799a83e52924b7b748701b3b0aa31c46.1648730443.git.ritesh.list@gmail.com>
Date:   Thu, 31 Mar 2022 18:24:23 +0530
From:   Ritesh Harjani <ritesh.list@...il.com>
To:     fstests <fstests@...r.kernel.org>
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        "Darrick J . Wong" <djwong@...nel.org>,
        Ritesh Harjani <riteshh@...ux.ibm.com>
Subject: [PATCHv3 4/4] generic/679: Add a test to check unwritten extents tracking

From: Ritesh Harjani <riteshh@...ux.ibm.com>

With these sequence of operation (in certain cases like with ext4 fast_commit)
could miss to track unwritten extents during replay phase
(after sudden FS shutdown).

This fstest adds a test case to test this.

5e4d0eba1ccaf19f
ext4: fix fast commit may miss tracking range for FALLOC_FL_ZERO_RANGE

Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>
---
 tests/generic/679     | 65 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/679.out |  6 ++++
 2 files changed, 71 insertions(+)
 create mode 100755 tests/generic/679
 create mode 100644 tests/generic/679.out

diff --git a/tests/generic/679 b/tests/generic/679
new file mode 100755
index 00000000..4f35a9cd
--- /dev/null
+++ b/tests/generic/679
@@ -0,0 +1,65 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 IBM Corporation.  All Rights Reserved.
+#
+# FS QA Test 679
+#
+# Test below sequence of operation which (w/o below kernel patch) in case of
+# ext4 with fast_commit may misss to track unwritten extents.
+# commit 5e4d0eba1ccaf19f
+# ext4: fix fast commit may miss tracking range for FALLOC_FL_ZERO_RANGE
+#
+. ./common/preamble
+_begin_fstest auto quick log shutdown recoveryloop
+
+# Override the default cleanup function.
+_cleanup()
+{
+	cd /
+	rm -r -f $tmp.*
+}
+
+# Import common functions.
+. ./common/filter
+. ./common/punch
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_require_scratch
+_require_xfs_io_command "fzero"
+_require_xfs_io_command "fiemap"
+_require_scratch_shutdown
+
+t1=$SCRATCH_MNT/t1
+
+_scratch_mkfs > $seqres.full 2>&1
+
+_scratch_mount >> $seqres.full 2>&1
+
+bs=$(_get_file_block_size $SCRATCH_MNT)
+
+# create and write data to t1
+$XFS_IO_PROG -f -c "pwrite 0 $((100*$bs))" $t1 | _filter_xfs_io_numbers
+
+# fsync t1
+$XFS_IO_PROG -c "fsync" $t1
+
+# fzero certain range in between
+$XFS_IO_PROG -c "fzero -k  $((40*$bs)) $((20*$bs))" $t1
+
+# fsync t1
+$XFS_IO_PROG -c "fsync" $t1
+
+# shutdown FS now for replay of journal to kick during next mount
+_scratch_shutdown -v >> $seqres.full 2>&1
+
+_scratch_cycle_mount
+
+# check fiemap reported is valid or not
+$XFS_IO_PROG -c "fiemap -v" $t1 | _filter_fiemap_flags $bs
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/679.out b/tests/generic/679.out
new file mode 100644
index 00000000..4d3c3377
--- /dev/null
+++ b/tests/generic/679.out
@@ -0,0 +1,6 @@
+QA output created by 679
+wrote XXXX/XXXX bytes at offset XXXX
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+0: [0..39]: none
+1: [40..59]: unwritten
+2: [60..99]: nonelast
-- 
2.31.1