[v3,07/17] generic: add mmap CoW test for mixed&destination extents

Commit Message

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

Ensuring that copy on write in mmap mode works when the CoW range originally
covers multiple extents, mixed with reflinked, unwritten, hole, regular and
delalloc blocks.
(MMAP version of generic/200,199)

Signed-off-by: Shiyang Ruan <[e-mail]>
---
 tests/generic/905     | 67 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/905.out | 12 ++++++++
 2 files changed, 79 insertions(+)
 create mode 100755 tests/generic/905
 create mode 100644 tests/generic/905.out

Patch

diff --git a/tests/generic/905 b/tests/generic/905
new file mode 100755
index 00000000..8178f630
--- /dev/null
+++ b/tests/generic/905
@@ -0,0 +1,67 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. 905
+#
+# Ensuring that copy on write in mmap mode works when the CoW
+# range originally covers multiple extents, mixed with reflinked, unwritten,
+# hole, regular and delalloc blocks.
+# (MMAP version of generic/200,199)
+#   - Create a file with the following repeating sequence of blocks:
+#     1. reflinked
+#     2. unwritten
+#     3. hole
+#     4. regular block
+#     5. delalloc
+#   - 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 punch
+
+# Import common functions.
+. ./common/filter
+. ./common/reflink
+
+# real QA test starts here
+_require_scratch_reflink
+_require_scratch_delalloc
+_require_xfs_io_command "falloc"
+_require_xfs_io_command "fpunch"
+
+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_rainbow $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))
+_weave_reflink_rainbow_delalloc $blksz $nr $testdir/file3 >> $seqres.full
+# now cow
+mmapsz=$((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
diff --git a/tests/generic/905.out b/tests/generic/905.out
new file mode 100644
index 00000000..6fb0be5f
--- /dev/null
+++ b/tests/generic/905.out
@@ -0,0 +1,12 @@ 
+QA output created by 905
+Format and mount
+Create the original files
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-905/file1
+6366fd359371414186688a0ef6988893  SCRATCH_MNT/test-905/file3
+6366fd359371414186688a0ef6988893  SCRATCH_MNT/test-905/file3.chk
+mmap CoW across the transition
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-905/file1
+26aa3a0749b867ec58363c8539ee5471  SCRATCH_MNT/test-905/file3
+26aa3a0749b867ec58363c8539ee5471  SCRATCH_MNT/test-905/file3.chk