From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Date: Tue, 14 Dec 2021 08:18:59 +0000 (+0800)
Subject: generic: add mmap CoW test for regular&destination extents
X-Git-Tag: v2022.05.01~142
X-Git-Url: http://git.apps.os.sepia.ceph.com/?p=xfstests-dev.git;a=commitdiff_plain;h=b94d2fa60e1a979399eda96825f7b6d524a9d30a

generic: add mmap CoW test for regular&destination extents

Ensuring that copy on write in mmap mode works when the CoW range originally
covers multiple extents, some regular, some not.
(MMAP version of generic/197,196)

Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
---

diff --git a/tests/generic/658 b/tests/generic/658
new file mode 100755
index 00000000..a296f88b
--- /dev/null
+++ b/tests/generic/658
@@ -0,0 +1,59 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. 658
+#
+# Ensuring that copy on write in mmap mode works when the CoW
+# range originally covers multiple extents, some regular, some not.
+# (MMAP version of generic/197,196)
+#   - Create two files.
+#   - Reflink the odd blocks of the first file into the second file.
+#   - mmap CoW across the halfway mark, starting with the unwritten extent.
+#   - Check that the files are now different where we say they're different.
+#
+. ./common/preamble
+_begin_fstest auto quick clone
+
+# Import common functions.
+. ./common/filter
+. ./common/reflink
+
+# real QA test starts here
+_require_scratch_reflink
+_require_xfs_io_command "falloc"
+
+echo "Format and mount"
+_scratch_mkfs > $seqres.full 2>&1
+_scratch_mount >> $seqres.full 2>&1
+
+testdir=$SCRATCH_MNT/test-$seq
+mkdir $testdir
+
+echo "Create the original files"
+blksz=65536
+nr=64
+filesize=$((blksz * nr))
+_weave_reflink_regular $blksz $nr $testdir/file1 $testdir/file3 >> $seqres.full
+_scratch_cycle_mount
+
+echo "Compare files"
+md5sum $testdir/file1 | _filter_scratch
+md5sum $testdir/file3 | _filter_scratch
+md5sum $testdir/file3.chk | _filter_scratch
+
+echo "mmap CoW across the transition"
+cowoff=$((filesize / 4))
+cowsz=$((filesize / 2))
+mmapsz=$((cowoff + cowsz))
+_mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file3 >> $seqres.full
+_mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file3.chk >> $seqres.full
+_scratch_cycle_mount
+
+echo "Compare files"
+md5sum $testdir/file1 | _filter_scratch
+md5sum $testdir/file3 | _filter_scratch
+md5sum $testdir/file3.chk | _filter_scratch
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/658.out b/tests/generic/658.out
new file mode 100644
index 00000000..b22282da
--- /dev/null
+++ b/tests/generic/658.out
@@ -0,0 +1,12 @@
+QA output created by 658
+Format and mount
+Create the original files
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-658/file1
+d3959a68638c50af07f0258e032cb554  SCRATCH_MNT/test-658/file3
+d3959a68638c50af07f0258e032cb554  SCRATCH_MNT/test-658/file3.chk
+mmap CoW across the transition
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-658/file1
+55968a95dfc0120df4e8485576514320  SCRATCH_MNT/test-658/file3
+55968a95dfc0120df4e8485576514320  SCRATCH_MNT/test-658/file3.chk