Commit 0261cd9f authored by NeilBrown's avatar NeilBrown
Browse files

md: allow v0.91 metadata to record devices as being active but not in-sync. 



This is a combination that didn't really make sense before.
However when a reshape is converting e.g. raid5 -> raid6, the extra
device is not fully in-sync, but is certainly active and contains
important data.
So allow that start to be meaningful and in particular get
the 'recovery_offset' value (which is needed for any non-in-sync
active device) from the reshape_position.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 5e865106

drivers/md/md.c

+25 −6
Original line number Diff line number Diff line
@@ -944,6 +944,14 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) 
			    desc->raid_disk < mddev->raid_disks */) {

			set_bit(In_sync, &rdev->flags);

			rdev->raid_disk = desc->raid_disk;

		} else if (desc->state & (1<<MD_DISK_ACTIVE)) {

			/* active but not in sync implies recovery up to

			 * reshape position.  We don't know exactly where

			 * that is, so set to zero for now */

			if (mddev->minor_version >= 91) {

				rdev->recovery_offset = 0;

				rdev->raid_disk = desc->raid_disk;

			}

		}

		if (desc->state & (1<<MD_DISK_WRITEMOSTLY))

			set_bit(WriteMostly, &rdev->flags);
@@ -1032,8 +1040,19 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) 
	list_for_each_entry(rdev2, &mddev->disks, same_set) {

		mdp_disk_t *d;

		int desc_nr;

		if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)

		    && !test_bit(Faulty, &rdev2->flags))

		int is_active = test_bit(In_sync, &rdev2->flags);



		if (rdev2->raid_disk >= 0 &&

		    sb->minor_version >= 91)

			/* we have nowhere to store the recovery_offset,

			 * but if it is not below the reshape_position,

			 * we can piggy-back on that.

			 */

			is_active = 1;

		if (rdev2->raid_disk < 0 ||

		    test_bit(Faulty, &rdev2->flags))

			is_active = 0;

		if (is_active)

			desc_nr = rdev2->raid_disk;

		else

			desc_nr = next_spare++;
@@ -1043,15 +1062,15 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) 
		d->number = rdev2->desc_nr;

		d->major = MAJOR(rdev2->bdev->bd_dev);

		d->minor = MINOR(rdev2->bdev->bd_dev);

		if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)

		    && !test_bit(Faulty, &rdev2->flags))

		if (is_active)

			d->raid_disk = rdev2->raid_disk;

		else

			d->raid_disk = rdev2->desc_nr; /* compatibility */

		if (test_bit(Faulty, &rdev2->flags))

			d->state = (1<<MD_DISK_FAULTY);

		else if (test_bit(In_sync, &rdev2->flags)) {

		else if (is_active) {

			d->state = (1<<MD_DISK_ACTIVE);

			if (test_bit(In_sync, &rdev2->flags))

				d->state |= (1<<MD_DISK_SYNC);

			active++;

			working++;

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