dm-raid: do not include dm-core.h

JIRA: https://issues.redhat.com/browse/RHEL-119009
Upstream Status: kernel/git/torvalds/linux.git

commit 8d05316
Author: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Date:   Mon Jul 21 11:49:13 2025 +0800

    dm-raid: do not include dm-core.h

    In commit 4cc9613 ("dm: move request-based code out to dm-rq.[hc]")
    we have a note: "DM targets should _never_ include dm-core.h!". And it
    is not used in any DM targets except dm-raid now, so let's remove it
    from dm-raid for consistency, also use special helpers instead of
    accessing dm_table and mapper_device fields directly. This change is
    merely a cleanup and should not affect functionality.

    Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
    Reviewed-by: Yu Kuai <yukuai3@huawei.com>
    Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>

Author: bmarzins

drivers/md/dm-raid.c

@@ -14,7 +14,6 @@
 #include "raid5.h"
 #include "raid10.h"
 #include "md-bitmap.h"
-#include "dm-core.h"
 
 #include <linux/device-mapper.h>
 
@@ -3313,7 +3312,7 @@ 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;
+	rs->md.dm_gendisk = dm_disk(dm_table_get_md(ti->table));
 
 	mddev_unlock(&rs->md);
 	return 0;