From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Date: Tue, 14 Dec 2021 08:18:58 +0000 (+0800)
Subject: generic: add mmap CoW test for ranges of two shared files
X-Git-Tag: v2022.05.01~143
X-Git-Url: http://git.apps.os.sepia.ceph.com/?p=xfstests-dev.git;a=commitdiff_plain;h=924922639321433722deb771ca26d1a9962f38a2

generic: add mmap CoW test for ranges of two shared files

Ensuring that copy on write in mmap mode works when the CoW range originally
covers multiple extents. (MMAP version of generic/185,183)

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/657 b/tests/generic/657
new file mode 100755
index 00000000..e0fecd54
--- /dev/null
+++ b/tests/generic/657
@@ -0,0 +1,69 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. 657
+#
+# Ensuring that copy on write in mmap mode works when the CoW
+# range originally covers multiple extents. (MMAP version of generic/185,183)
+#   - Create two files
+#   - Reflink the odd blocks of the first file into a third file.
+#   - Reflink the even blocks of the second file into the third file.
+#   - mmap CoW across the halfway mark.
+#   - 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
+
+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))
+_pwrite_byte 0x61 0 $filesize $testdir/file1 >> $seqres.full
+_pwrite_byte 0x62 0 $filesize $testdir/file2 >> $seqres.full
+seq 0 2 $((nr-1)) | while read f; do
+	_reflink_range $testdir/file1 $((blksz * f)) $testdir/file3 $((blksz * f)) $blksz >> $seqres.full
+	_pwrite_byte 0x61 $((blksz * f)) $blksz $testdir/file3.chk >> $seqres.full
+done
+seq 1 2 $((nr-1)) | while read f; do
+	_reflink_range $testdir/file2 $((blksz * f)) $testdir/file3 $((blksz * f)) $blksz >> $seqres.full
+	_pwrite_byte 0x62 $((blksz * f)) $blksz $testdir/file3.chk >> $seqres.full
+done
+_scratch_cycle_mount
+
+echo "Compare files"
+md5sum $testdir/file1 | _filter_scratch
+md5sum $testdir/file2 | _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/file2 | _filter_scratch
+md5sum $testdir/file3 | _filter_scratch
+md5sum $testdir/file3.chk | _filter_scratch
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/657.out b/tests/generic/657.out
new file mode 100644
index 00000000..4534c262
--- /dev/null
+++ b/tests/generic/657.out
@@ -0,0 +1,14 @@
+QA output created by 657
+Format and mount
+Create the original files
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-657/file1
+b83f9394092e15bdcda585cd8e776dc6  SCRATCH_MNT/test-657/file2
+d3959a68638c50af07f0258e032cb554  SCRATCH_MNT/test-657/file3
+d3959a68638c50af07f0258e032cb554  SCRATCH_MNT/test-657/file3.chk
+mmap CoW across the transition
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-657/file1
+b83f9394092e15bdcda585cd8e776dc6  SCRATCH_MNT/test-657/file2
+55968a95dfc0120df4e8485576514320  SCRATCH_MNT/test-657/file3
+55968a95dfc0120df4e8485576514320  SCRATCH_MNT/test-657/file3.chk