tree 5c2e31a8cbbfabf83d4251c8299ade26934f79fb
parent cb13ff69d6d61ab06285e3ef652f45ecda73e135
author NeilBrown <neilb@suse.de> 1348713321 +1000
committer NeilBrown <neilb@suse.de> 1348713321 +1000

md/raid10: fix "enough" function for detecting if array is failed.

The 'enough' function is written to work with 'near' arrays only
in that is implicitly assumes that the offset from one 'group' of
devices to the next is the same as the number of copies.
In reality it is the number of 'near' copies.

So change it to make this number explicit.

This bug makes it possible to run arrays without enough drives
present, which is dangerous.
It is appropriate for an -stable kernel, but will almost certainly
need to be modified for some of them.

Cc: stable@vger.kernel.org
Reported-by: Jakub Husák <jakub@gooseman.cz>
Signed-off-by: NeilBrown <neilb@suse.de>