MD: add sync_super to mddev_t struct (076f968b) · Commits · 戴 / test

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:

Jonathan Brassow <jbrassow@redhat.com> Signed-off-by:

NeilBrown <neilb@suse.de>

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);
		};

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