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-rw-r--r--drivers/md/raid5.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 3930b3e9aa0..5694eb8941b 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4169,8 +4169,13 @@ raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks)
if (!sectors)
sectors = mddev->dev_sectors;
- if (!raid_disks)
- raid_disks = conf->previous_raid_disks;
+ if (!raid_disks) {
+ /* size is defined by the smallest of previous and new size */
+ if (conf->raid_disks < conf->previous_raid_disks)
+ raid_disks = conf->raid_disks;
+ else
+ raid_disks = conf->previous_raid_disks;
+ }
sectors &= ~((sector_t)mddev->chunk_size/512 - 1);
return sectors * (raid_disks - conf->max_degraded);