On Apr 18, 2012, at 9:05 AM, Brassow Jonathan wrote:

5-of-5: changing the check to 'saved_raid_disk >= 0' would be fine, but I think I should initialize 'saved_raid_disk' to -1 in dm-raid.c then normally.  Right now, an nominal initial value is not set - meaning it is '0'.  (When a device comes back from a failure, 'saved_raid_disk' is assigned its old position.)

... that's not quite right.  I do call 'md_rdev_init' which sets 'saved_raid_disk' to -1.  Then, if the device has returned after a disappearance, I set 'saved_raid_disk' to it's old position.  Therefore, 'saved_raid_disk >= 0' would be fine and wouldn't require me to set -1 in dm-raid.c.

 brassow