[v3,09/17] generic: add mmap CoW test for unwritten&source extents

Commit Message

Shiyang Ruan Dec. 14, 2021, 8:19 a.m. UTC

Ensuring that copy on write in mmap mode to the source file when the CoW range
covers unwritten and regular shared blocks.
(MMAP version of generic/289,290)

Signed-off-by: Shiyang Ruan <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
---
 tests/generic/907     | 62 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/907.out | 12 +++++++++
 2 files changed, 74 insertions(+)
 create mode 100755 tests/generic/907
 create mode 100644 tests/generic/907.out

Patch

diff --git a/tests/generic/907 b/tests/generic/907
new file mode 100755
index 00000000..61c9293a
--- /dev/null
+++ b/tests/generic/907
@@ -0,0 +1,62 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. 907
+#
+# Ensuring that copy on write in mmap mode to the source file when the
+# CoW range covers unwritten and regular shared blocks.
+# (MMAP version of generic/289,290)
+#   - Create two files.
+#   - fallocate the first file.
+#   - Write the odd blocks of the first file.
+#   - Reflink the odd blocks of the first file into the second file.
+#   - mmap CoW the first file across the halfway mark, starting with the
+#     regular 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))
+_sweave_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 $testdir/file1.chk | _filter_scratch
+
+echo "mmap CoW across the transition"
+cowoff=$((filesize / 4))
+cowsz=$((filesize / 2))
+mmapsz=$((cowoff + cowsz))
+_mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file1 >> $seqres.full
+_mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file1.chk >> $seqres.full
+_scratch_cycle_mount
+
+echo "Compare files"
+md5sum $testdir/file1 | _filter_scratch
+md5sum $testdir/file3 | _filter_scratch
+md5sum $testdir/file1.chk | _filter_scratch
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/907.out b/tests/generic/907.out
new file mode 100644
index 00000000..c18b849c
--- /dev/null
+++ b/tests/generic/907.out
@@ -0,0 +1,12 @@ 
+QA output created by 907
+Format and mount
+Create the original files
+Compare files
+b8a8a88d4c143f79900c4b4e79aa3e37  SCRATCH_MNT/test-907/file1
+ce2023f765eba19677517c511886d5c9  SCRATCH_MNT/test-907/file3
+b8a8a88d4c143f79900c4b4e79aa3e37  SCRATCH_MNT/test-907/file1.chk
+mmap CoW across the transition
+Compare files
+e8cf59797f0b3758c8878c368bb4cf7e  SCRATCH_MNT/test-907/file1
+ce2023f765eba19677517c511886d5c9  SCRATCH_MNT/test-907/file3
+e8cf59797f0b3758c8878c368bb4cf7e  SCRATCH_MNT/test-907/file1.chk