generic: add mmap CoW test for unwritten&destination extents

Ensuring that copy on write in mmap mode works when the CoW range
originally covers multiple extents, some unwritten, some not. (MMAP
version of generic/189,188)

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/659 b/tests/generic/659
new file mode 100755 (executable)
index 0000000..e42077e
--- /dev/null
+++ b/tests/generic/659
@@ -0,0 +1,59 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. 659
+#
+# Ensuring that copy on write in mmap mode works when the CoW
+# range originally covers multiple extents, some unwritten, some not.
+# (MMAP version of generic/189,188)
+#   - Create a file and fallocate a second file.
+#   - 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_unwritten $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/659.out b/tests/generic/659.out
new file mode 100644 (file)
index 0000000..787e59c
--- /dev/null
+++ b/tests/generic/659.out
@@ -0,0 +1,12 @@
+QA output created by 659
+Format and mount
+Create the original files
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-659/file1
+fa50dba51826899c372464a153cb2117  SCRATCH_MNT/test-659/file3
+fa50dba51826899c372464a153cb2117  SCRATCH_MNT/test-659/file3.chk
+mmap CoW across the transition
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-659/file1
+09101629908f9bdd5d178e7ce20bb1bb  SCRATCH_MNT/test-659/file3
+09101629908f9bdd5d178e7ce20bb1bb  SCRATCH_MNT/test-659/file3.chk