xfs: add a test for writeback after close

Test that files written back after closing are packed tightly instead of
using up open zone resources.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/tests/xfs/4206 b/tests/xfs/4206
new file mode 100755 (executable)
index 0000000..63e6aeb
--- /dev/null
+++ b/tests/xfs/4206
@@ -0,0 +1,57 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Christoph Hellwig.
+#
+# FS QA Test No. 4206
+#
+# Test that data is packed tighly for writeback after the files were
+# closed.
+#
+. ./common/preamble
+_begin_fstest auto quick rw zone
+
+_cleanup()
+{
+       cd /
+       _scratch_unmount >/dev/null 2>&1
+}
+
+# Import common functions.
+. ./common/filter
+
+_require_scratch
+
+_filter_rgno()
+{
+       # the rg number is in column 4 of xfs_bmap output
+       perl -ne '
+               $rg = (split /\s+/)[4] ;
+               if ($rg =~ /\d+/) {print "$rg "} ;
+       '
+}
+
+_scratch_mkfs_xfs >>$seqres.full 2>&1
+_scratch_mount
+_require_xfs_scratch_zoned
+
+# Create a bunch of small files
+for i in `seq 1 100`; do
+       file=$SCRATCH_MNT/$i
+
+       $XFS_IO_PROG -f -c 'pwrite 0 8k' $file >>$seqres.full
+done
+
+sync
+
+# Check that all small files are placed together
+short_rg=`xfs_bmap -v $SCRATCH_MNT/1 | _filter_rgno`
+for i in `seq 2 100`; do
+       file=$SCRATCH_MNT/$i
+       rg=`xfs_bmap -v $file | _filter_rgno`
+       if [ "${rg}" != "${short_rg}" ]; then
+               echo "RG mismatch for file $i: $short_rg/$rg"
+       fi
+done
+
+status=0
+exit

diff --git a/tests/xfs/4206.out b/tests/xfs/4206.out
new file mode 100644 (file)
index 0000000..4835b50
--- /dev/null
+++ b/tests/xfs/4206.out
@@ -0,0 +1 @@
+QA output created by 4206