From: Dan Williams <dan.j.williams@intel.com>
Date: Fri, 27 Jun 2008 22:31:53 +0000 (+1000)
Subject: md: use stripe_head_state in ops_run_io()
X-Git-Tag: v2.6.27-rc1~957^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c4e5ac0a22e664eecf29249553cf16c2433f5f25;p=pandora-kernel.git

md: use stripe_head_state in ops_run_io()

From: Dan Williams <dan.j.williams@intel.com>

In handle_stripe after taking sh->lock we sample some bits into 's' (struct
stripe_head_state):

	s.syncing = test_bit(STRIPE_SYNCING, &sh->state);
	s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
	s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);

Use these values from 's' in ops_run_io() rather than re-sampling the bits.
This ensures a consistent snapshot (as seen under sh->lock) is used.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Neil Brown <neilb@suse.de>
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