Commit 7168be3c authored by Yu Kuai's avatar Yu Kuai
Browse files

md: record dm-raid gendisk in mddev 

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.

Link: https://lore.kernel.org/linux-raid/20250506124903.2540268-7-yukuai1@huaweicloud.com


Signed-off-by: default avatarYu Kuai <yukuai3@huawei.com>
Reviewed-by: default avatarXiao Ni <xni@redhat.com>
parent f2987c58

drivers/md/dm-raid.c

+3 −0
Original line number Diff line number Diff line
@@ -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))

drivers/md/md.h

+2 −1
Original line number Diff line number Diff line
@@ -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;