In raid5, there are scenarios where some ios are deferred to a later
time, and some IO need a flush to complete. To make sure we make
progress with these IOs, we need to call the following functions:
flush_deferred_bios(conf);
r5l_flush_stripe_to_raid(conf->log);
Both of these functions are called in raid5d(), but missing in
raid5_do_work(). As a result, these functions are not called
when multi-threading (group_thread_cnt > 0) is enabled. This patch
adds calls to these function to raid5_do_work().
Note for stable branches:
r5l_flush_stripe_to_raid(conf->log) is need for 4.4+
flush_deferred_bios(conf) is only needed for 4.11+
Cc: stable@xxxxxxxxxxxxxxx (4.4+)
Signed-off-by: Song Liu <songliubraving@xxxxxx>
---
drivers/md/raid5.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index f64ff32..6af57c6 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6226,6 +6226,10 @@ static void raid5_do_work(struct work_struct *work)
spin_unlock_irq(&conf->device_lock);
+ flush_deferred_bios(conf);
+
+ r5l_flush_stripe_to_raid(conf->log);
+
async_tx_issue_pending_all();
blk_finish_plug(&plug);
--
2.9.5