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Commit 3a3a5ddb authored by NeilBrown's avatar NeilBrown
Browse files

Update recovery_offset even when external metadata is used. 



The update of ->recovery_offset in sync_sbs is appropriate even then external
metadata is in use.  However sync_sbs is only called when native
metadata is used.

So move that update in to the top of md_update_sb (which is the only
caller of sync_sbs) before the test on ->external.

This moves the update out of ->write_lock protection, but those fields
only need ->reconfig_mutex protection which they still have.

Also move the test on ->persistent up to where ->external is set as
for metadata update purposes they are the same.

Clear MD_CHANGE_DEVS and MD_CHANGE_CLEAN as they can only be confusing
if ->external is set or ->persistent isn't.

Finally move the update of ->utime down as it is only relevent (like
the ->events update) for native metadata.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Reported-by: default avatar"Kwolek, Adam" <adam.kwolek@intel.com>
parent da5cabf8

drivers/md/md.c

+18 −26
Original line number Diff line number Diff line
@@ -2136,16 +2136,6 @@ static void sync_sbs(mddev_t * mddev, int nospares) 
	 * with the rest of the array)

	 */

	mdk_rdev_t *rdev;



	/* First make sure individual recovery_offsets are correct */

	list_for_each_entry(rdev, &mddev->disks, same_set) {

		if (rdev->raid_disk >= 0 &&

		    mddev->delta_disks >= 0 &&

		    !test_bit(In_sync, &rdev->flags) &&

		    mddev->curr_resync_completed > rdev->recovery_offset)

				rdev->recovery_offset = mddev->curr_resync_completed;



	}	

	list_for_each_entry(rdev, &mddev->disks, same_set) {

		if (rdev->sb_events == mddev->events ||

		    (nospares &&
@@ -2167,12 +2157,27 @@ static void md_update_sb(mddev_t * mddev, int force_change) 
	int sync_req;

	int nospares = 0;



	mddev->utime = get_seconds();

	if (mddev->external)

		return;

repeat:

	/* First make sure individual recovery_offsets are correct */

	list_for_each_entry(rdev, &mddev->disks, same_set) {

		if (rdev->raid_disk >= 0 &&

		    mddev->delta_disks >= 0 &&

		    !test_bit(In_sync, &rdev->flags) &&

		    mddev->curr_resync_completed > rdev->recovery_offset)

				rdev->recovery_offset = mddev->curr_resync_completed;



	}	

	if (mddev->external || !mddev->persistent) {

		clear_bit(MD_CHANGE_DEVS, &mddev->flags);

		clear_bit(MD_CHANGE_CLEAN, &mddev->flags);

		wake_up(&mddev->sb_wait);

		return;

	}



	spin_lock_irq(&mddev->write_lock);



	mddev->utime = get_seconds();



	set_bit(MD_CHANGE_PENDING, &mddev->flags);

	if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))

		force_change = 1;
@@ -2221,19 +2226,6 @@ static void md_update_sb(mddev_t * mddev, int force_change) 
		MD_BUG();

		mddev->events --;

	}



	/*

	 * do not write anything to disk if using

	 * nonpersistent superblocks

	 */

	if (!mddev->persistent) {

		if (!mddev->external)

			clear_bit(MD_CHANGE_PENDING, &mddev->flags);



		spin_unlock_irq(&mddev->write_lock);

		wake_up(&mddev->sb_wait);

		return;

	}

	sync_sbs(mddev, nospares);

	spin_unlock_irq(&mddev->write_lock);