[v3,04/17] generic: add mmap CoW test for holes&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, some holes, some not.
(MMAP version of generic/191,190)

Signed-off-by: Shiyang Ruan <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
---
 tests/generic/903     | 59 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/903.out | 12 +++++++++
 2 files changed, 71 insertions(+)
 create mode 100755 tests/generic/903
 create mode 100644 tests/generic/903.out

Patch

diff --git a/tests/generic/903 b/tests/generic/903
new file mode 100755
index 00000000..d0de3f26
--- /dev/null
+++ b/tests/generic/903
@@ -0,0 +1,59 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. 903
+#
+# Ensuring that copy on write in mmap mode works when the CoW
+# range originally covers multiple extents, some holes, some not.
+# (MMAP version of generic/191,190)
+#   - Create a file and truncate 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_holes $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/903.out b/tests/generic/903.out
new file mode 100644
index 00000000..bf57acc7
--- /dev/null
+++ b/tests/generic/903.out
@@ -0,0 +1,12 @@ 
+QA output created by 903
+Format and mount
+Create the original files
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-903/file1
+fa50dba51826899c372464a153cb2117  SCRATCH_MNT/test-903/file3
+fa50dba51826899c372464a153cb2117  SCRATCH_MNT/test-903/file3.chk
+mmap CoW across the transition
+Compare files
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-903/file1
+09101629908f9bdd5d178e7ce20bb1bb  SCRATCH_MNT/test-903/file3
+09101629908f9bdd5d178e7ce20bb1bb  SCRATCH_MNT/test-903/file3.chk