tree 898a3b7f4b80d54d15d5b415397b1f4dd588e116
parent 2b7497f0e0a0b9cf21d822e427d5399b2056501a
author Dan Williams <dan.j.williams@intel.com> 1214605913 +1000
committer Neil Brown <neilb@notabene.brown> 1214605913 +1000

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>