tree 1ea7bffe6fbd61874922fb9da20c0a9157a9d71c
parent 78eaa0d4cbcdb345992fa3dd22b3bcbb473cc064
author NeilBrown <neilb@suse.de> 1372919896 +1000
committer NeilBrown <neilb@suse.de> 1372920172 +1000

md/raid5: allow 5-device RAID6 to be reshaped to 4-device.

There is a bug in 'check_reshape' for raid5.c  To checks
that the new minimum number of devices is large enough (which is
good), but it does so also after the reshape has started (bad).

This is bad because
 - the calculation is now wrong as mddev->raid_disks has changed
   already, and
 - it is pointless because it is now too late to stop.

So only perform that test when reshape has not been committed to.

Signed-off-by: NeilBrown <neilb@suse.de>