[PATCH 05/10] btrfs: add helper to kill background process running _btrfs_stress_defrag

fdmanana
2024-03-27T17:12:00Z

From: Filipe Manana <fdmanana@suse.com>

Killing a background process running _btrfs_stress_defrag() is not as
simple as sending a signal to the process and waiting for it to die.
Therefore we have the following logic to terminate such process:

kill $pid
wait $pid
while ps aux | grep "btrfs filesystem defrag" | grep -qv grep; do
sleep 1
done

Since this is repeated in several test cases, move this logic to a common
helper and use it in all affected test cases. This will help to avoid
repeating the same code again several times in upcoming changes.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
common/btrfs | 14 ++++++++++++++
tests/btrfs/062 | 7 +------
tests/btrfs/067 | 8 ++------
tests/btrfs/070 | 11 +++++------
tests/btrfs/072 | 7 +------
tests/btrfs/074 | 11 +++++------
6 files changed, 28 insertions(+), 30 deletions(-)

diff --git a/common/btrfs b/common/btrfs
index d0adeea1..46056d4a 100644
--- a/common/btrfs
+++ b/common/btrfs
@@ -383,6 +383,20 @@ _btrfs_stress_defrag()
done
}

+# Kill a background process running _btrfs_stress_defrag()
+_btrfs_kill_stress_defrag_pid()
+{
+ local defrag_pid=$1
+
+ # Ignore if process already died.
+ kill $defrag_pid &> /dev/null
+ wait $defrag_pid &> /dev/null
+ # Wait for the defrag operation to finish.
+ while ps aux | grep "btrfs filesystem defrag" | grep -qv grep; do
+ sleep 1
+ done
+}
+
# stress btrfs by remounting it with different compression algorithms in a loop
# run this with fsstress running at background could exercise the compression
# code path and ensure no race when switching compression algorithm with constant
diff --git a/tests/btrfs/062 b/tests/btrfs/062
index a2639d6c..59d581be 100755
--- a/tests/btrfs/062
+++ b/tests/btrfs/062
@@ -53,12 +53,7 @@ run_test()
echo "Wait for fsstress to exit and kill all background workers" >>$seqres.full
wait $fsstress_pid
_btrfs_kill_stress_balance_pid $balance_pid
- kill $defrag_pid
- wait $defrag_pid
- # wait for the defrag operation to finish
- while ps aux | grep "btrfs filesystem defrag" | grep -qv grep; do
- sleep 1
- done
+ _btrfs_kill_stress_defrag_pid $defrag_pid

echo "Scrub the filesystem" >>$seqres.full
$BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >>$seqres.full 2>&1
diff --git a/tests/btrfs/067 b/tests/btrfs/067
index 709db155..2bb00b87 100755
--- a/tests/btrfs/067
+++ b/tests/btrfs/067
@@ -58,12 +58,8 @@ run_test()
wait $fsstress_pid

touch $stop_file
- kill $defrag_pid
- wait
- # wait for btrfs defrag process to exit, otherwise it will block umount
- while ps aux | grep "btrfs filesystem defrag" | grep -qv grep; do
- sleep 1
- done
+ wait $subvol_pid
+ _btrfs_kill_stress_defrag_pid $defrag_pid

echo "Scrub the filesystem" >>$seqres.full
$BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >>$seqres.full 2>&1
diff --git a/tests/btrfs/070 b/tests/btrfs/070
index 54aa275c..cefa5723 100755
--- a/tests/btrfs/070
+++ b/tests/btrfs/070
@@ -60,17 +60,16 @@ run_test()

echo "Wait for fsstress to exit and kill all background workers" >>$seqres.full
wait $fsstress_pid
- kill $replace_pid $defrag_pid
- wait
+ kill $replace_pid
+ wait $replace_pid

- # wait for the defrag and replace operations to finish
- while ps aux | grep "btrfs filesystem defrag" | grep -qv grep; do
- sleep 1
- done
+ # wait for the replace operation to finish
while ps aux | grep "replace start" | grep -qv grep; do
sleep 1
done

+ _btrfs_kill_stress_defrag_pid $defrag_pid
+
echo "Scrub the filesystem" >>$seqres.full
$BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >>$seqres.full 2>&1
if [ $? -ne 0 ]; then
diff --git a/tests/btrfs/072 b/tests/btrfs/072
index 6c15b51f..505d0b57 100755
--- a/tests/btrfs/072
+++ b/tests/btrfs/072
@@ -52,13 +52,8 @@ run_test()

echo "Wait for fsstress to exit and kill all background workers" >>$seqres.full
wait $fsstress_pid
- kill $defrag_pid
- wait $defrag_pid
- # wait for the defrag operation to finish
- while ps aux | grep "btrfs filesystem defrag" | grep -qv grep; do
- sleep 1
- done

+ _btrfs_kill_stress_defrag_pid $defrag_pid
_btrfs_kill_stress_scrub_pid $scrub_pid

echo "Scrub the filesystem" >>$seqres.full
diff --git a/tests/btrfs/074 b/tests/btrfs/074
index 9b22c620..d51922d0 100755
--- a/tests/btrfs/074
+++ b/tests/btrfs/074
@@ -52,16 +52,15 @@ run_test()

echo "Wait for fsstress to exit and kill all background workers" >>$seqres.full
wait $fsstress_pid
- kill $defrag_pid $remount_pid
- wait
- # wait for the defrag and remount operations to finish
- while ps aux | grep "btrfs filesystem defrag" | grep -qv grep; do
- sleep 1
- done
+ kill $remount_pid
+ wait $remount_pid
+ # wait for the remount operation to finish
while ps aux | grep "mount.*$SCRATCH_MNT" | grep -qv grep; do
sleep 1
done

+ _btrfs_kill_stress_defrag_pid $defrag_pid
+
echo "Scrub the filesystem" >>$seqres.full
$BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >>$seqres.full 2>&1
if [ $? -ne 0 ]; then
--
2.43.0