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md: record dm-raid gendisk in mddev

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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: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Xiao Ni <xni@redhat.com>
This commit is contained in:
Yu Kuai 2025-05-06 20:49:00 +08:00
parent f2987c5816
commit 7168be3c8a
2 changed files with 5 additions and 1 deletions
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3
drivers/md/dm-raid.c
View File

@ -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))

3
drivers/md/md.h
View File

@ -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;