From: Yu Kuai <yuku...@huawei.com>
Following patch will use gendisk to check if there are normal IO
completed or inflight, to fix a problem in mdraid that foreground IO
can be starved by background sync IO in later patches.
Signed-off-by: Yu Kuai <yuku...@huawei.com>
Reviewed-by: Xiao Ni <x...@redhat.com>
---
drivers/md/dm-raid.c | 3 +++
drivers/md/md.h | 3 ++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 6adc55fd90d3..127138c61be5 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -14,6 +14,7 @@
#include "raid5.h"
#include "raid10.h"
#include "md-bitmap.h"
+#include "dm-core.h"
#include <linux/device-mapper.h>
@@ -3308,6 +3309,7 @@ static int raid_ctr(struct dm_target *ti, unsigned int
argc, char **argv)
/* Disable/enable discard support on raid set. */
configure_discard_support(rs);
+ rs->md.dm_gendisk = ti->table->md->disk;
mddev_unlock(&rs->md);
return 0;
@@ -3327,6 +3329,7 @@ static void raid_dtr(struct dm_target *ti)
mddev_lock_nointr(&rs->md);
md_stop(&rs->md);
+ rs->md.dm_gendisk = NULL;
mddev_unlock(&rs->md);
if (work_pending(&rs->md.event_work))
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 1cf00a04bcdd..9d55b4630077 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -404,7 +404,8 @@ struct mddev {
* are happening, so run/
* takeover/stop are not
safe
*/
- struct gendisk *gendisk;
+ struct gendisk *gendisk; /* mdraid gendisk */
+ struct gendisk *dm_gendisk; /* dm-raid gendisk */
struct kobject kobj;
int hold_active;
--
2.39.2
