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Commit 076f968b authored by Jonathan Brassow's avatar Jonathan Brassow Committed by NeilBrown
Browse files

MD: add sync_super to mddev_t struct 



Add the 'sync_super' function pointer to MD array structure (struct mddev_s)

If device-mapper (dm-raid.c) is to define its own on-disk superblock and be
able to load it, there must still be a way for MD to initiate superblock
updates.  The simplest way to make this happen is to provide a pointer in
the MD array structure that can be set by device-mapper (or other module)
with a function to do this.  If the function has been set, it will be used;
otherwise, the method with be looked up via 'super_types' as usual.

Signed-off-by: default avatarJonathan Brassow <jbrassow@redhat.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 1ed7242e

drivers/md/md.c

+13 −2
Original line number Diff line number Diff line
@@ -1753,6 +1753,18 @@ static struct super_type super_types[] = { 
	},

};



static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev)

{

	if (mddev->sync_super) {

		mddev->sync_super(mddev, rdev);

		return;

	}



	BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));



	super_types[mddev->major_version].sync_super(mddev, rdev);

}



static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)

{

	mdk_rdev_t *rdev, *rdev2;
@@ -2171,7 +2183,6 @@ static void sync_sbs(mddev_t * mddev, int nospares) 
			/* Don't update this superblock */

			rdev->sb_loaded = 2;

		} else {

			super_types[mddev->major_version].

			sync_super(mddev, rdev);

			rdev->sb_loaded = 1;

		}

drivers/md/md.h

+1 −0
Original line number Diff line number Diff line
@@ -330,6 +330,7 @@ struct mddev_s 
	atomic_t flush_pending;

	struct work_struct flush_work;

	struct work_struct event_work;	/* used by dm to report failure event */

	void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);

};