[PATCH 06/10] btrfs: add helper to kill background process running _btrfs_stress_remount_compress

fdmanana
2024-03-27T17:12:01Z

From: Filipe Manana <fdmanana@suse.com>

Killing a background process running _btrfs_stress_remount_compress() 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 $pid
while ps aux | grep "mount.*$SCRATCH_MNT" | 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 | 15 +++++++++++++++
tests/btrfs/063 | 7 +------
tests/btrfs/068 | 8 ++------
tests/btrfs/071 | 12 +++++-------
tests/btrfs/073 | 8 +-------
tests/btrfs/074 | 8 +-------
6 files changed, 25 insertions(+), 33 deletions(-)

diff --git a/common/btrfs b/common/btrfs
index 46056d4a..66a3a347 100644
--- a/common/btrfs
+++ b/common/btrfs
@@ -411,6 +411,21 @@ _btrfs_stress_remount_compress()
done
}

+# Kill a background process running _btrfs_stress_remount_compress()
+_btrfs_kill_stress_remount_compress_pid()
+{
+ local remount_pid=$1
+ local btrfs_mnt=$2
+
+ # Ignore if process already died.
+ kill $remount_pid &> /dev/null
+ wait $remount_pid &> /dev/null
+ # Wait for the remount loop to finish.
+ while ps aux | grep "mount.*${btrfs_mnt}" | grep -qv grep; do
+ sleep 1
+ done
+}
+
# stress btrfs by replacing devices in a loop
# Note that at least 3 devices are needed in SCRATCH_DEV_POOL and the last
# device should be free(not used by btrfs)
diff --git a/tests/btrfs/063 b/tests/btrfs/063
index baf0c356..5ee2837f 100755
--- a/tests/btrfs/063
+++ b/tests/btrfs/063
@@ -52,12 +52,7 @@ 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 $remount_pid
- wait $remount_pid
- # wait for the remount loop to finish
- while ps aux | grep "mount.*$SCRATCH_MNT" | grep -qv grep; do
- sleep 1
- done
+ _btrfs_kill_stress_remount_compress_pid $remount_pid $SCRATCH_MNT

echo "Scrub the filesystem" >>$seqres.full
$BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >>$seqres.full 2>&1
diff --git a/tests/btrfs/068 b/tests/btrfs/068
index 15fd41db..db53254a 100755
--- a/tests/btrfs/068
+++ b/tests/btrfs/068
@@ -58,12 +58,8 @@ run_test()
wait $fsstress_pid

touch $stop_file
- kill $remount_pid
- wait
- # wait for the remount loop process to finish
- while ps aux | grep "mount.*$SCRATCH_MNT" | grep -qv grep; do
- sleep 1
- done
+ wait $subvol_pid
+ _btrfs_kill_stress_remount_compress_pid $remount_pid $SCRATCH_MNT

echo "Scrub the filesystem" >>$seqres.full
$BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >>$seqres.full 2>&1
diff --git a/tests/btrfs/071 b/tests/btrfs/071
index 6ebbd8cc..7ba15390 100755
--- a/tests/btrfs/071
+++ b/tests/btrfs/071
@@ -58,17 +58,15 @@ run_test()
echo "$remount_pid" >>$seqres.full

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

- # wait for the remount and replace operations to finish
+ # wait for the replace operationss to finish
while ps aux | grep "replace start" | grep -qv grep; do
sleep 1
done
- while ps aux | grep "mount.*$SCRATCH_MNT" | grep -qv grep; do
- sleep 1
- done
+
+ _btrfs_kill_stress_remount_compress_pid $remount_pid $SCRATCH_MNT

echo "Scrub the filesystem" >>$seqres.full
$BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >>$seqres.full 2>&1
diff --git a/tests/btrfs/073 b/tests/btrfs/073
index 49a4abd1..50358286 100755
--- a/tests/btrfs/073
+++ b/tests/btrfs/073
@@ -51,13 +51,7 @@ run_test()

echo "Wait for fsstress to exit and kill all background workers" >>$seqres.full
wait $fsstress_pid
- 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_remount_compress_pid $remount_pid $SCRATCH_MNT
_btrfs_kill_stress_scrub_pid $scrub_pid

echo "Scrub the filesystem" >>$seqres.full
diff --git a/tests/btrfs/074 b/tests/btrfs/074
index d51922d0..6e93b36a 100755
--- a/tests/btrfs/074
+++ b/tests/btrfs/074
@@ -52,13 +52,7 @@ run_test()

echo "Wait for fsstress to exit and kill all background workers" >>$seqres.full
wait $fsstress_pid
- 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_remount_compress_pid $remount_pid $SCRATCH_MNT
_btrfs_kill_stress_defrag_pid $defrag_pid

echo "Scrub the filesystem" >>$seqres.full
--
2.43.0