From: NeilBrown <neilb@suse.de>
Date: Fri, 8 May 2015 08:19:40 +0000 (+1000)
Subject: md/raid5: fix handling of degraded stripes in batches.
X-Git-Tag: omap-for-v4.2/wakeirq-drivers~2^2~39^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bb27051f9fd7643f05d8f0babce3337f0b9b3087;p=pandora-kernel.git

md/raid5: fix handling of degraded stripes in batches.

There is no need for special handling of stripe-batches when the array
is degraded.

There may be if there is a failure in the batch, but STRIPE_DEGRADED
does not imply an error.

So don't set STRIPE_BATCH_ERR in ops_run_io just because the array is
degraded.
This actually causes a bug: the STRIPE_DEGRADED flag gets cleared in
check_break_stripe_batch_list() and so the bitmap bit gets cleared
when it shouldn't.

So in check_break_stripe_batch_list(), split the batch up completely -
again STRIPE_DEGRADED isn't meaningful.

Also don't set STRIPE_BATCH_ERR when there is a write error to a
replacement device.  This simply removes the replacement device and
requires no extra handling.

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