(md: Online Capacity Expansion for IMSM)
When sum of added disks and degraded disks is greater than max_degraded number, reshape decides that stripe is broken, so bio i/o error is a result.
Added disks without data has no impact on volume degradation (contains no data so far), so we have to be sure that all disks used to reshape has In_sync flag set.
We have to do this for disks without data.
---
drivers/md/raid5.c | 17 ++++++++++++++++-
1 files changed, 16 insertions(+), 1 deletions(-)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index dc25a32..cb74045 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5468,7 +5468,7 @@ static int raid5_start_reshape(mddev_t *mddev)
/* Add some new drives, as many as will fit.
* We know there are enough to make the newly sized array work.
*/
- list_for_each_entry(rdev, &mddev->disks, same_set)
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags)) {
if (raid5_add_disk(mddev, rdev) == 0) { @@ -5488,6 +5488,21 @@ static int raid5_start_reshape(mddev_t *mddev)
} else
break;
}
+ /* if there is Online Capacity Expansion
+ * on degraded array for external meta
+ */
+ if (mddev->external &&
+ (conf->raid_disks <= (disk_count + conf->max_degraded))) {
+ /* check if not spare */
+ if (!(rdev->raid_disk < 0 &&
+ !test_bit(Faulty, &rdev->flags)))
+ /* make sure that all disks,
+ * even added previously have
+ * in sync flag set
+ */
+ set_bit(In_sync, &rdev->flags);
+ }
+ }
/* When a reshape changes the number of devices, ->degraded
* is measured against the large of the pre and post number of
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