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authorNeilBrown <neilb@suse.de>2009-12-14 12:49:50 +1100
committerNeilBrown <neilb@suse.de>2009-12-14 12:51:40 +1100
commit729a18663a30a9c8076e3adc2b3e4c866974f935 (patch)
tree14f8e15ffa09d6a583fccdbe2ddf84c7cb8c2246 /init
parenta2826aa92e2e14db372eda01d333267258944033 (diff)
md/raid5: don't complete make_request on barrier until writes are scheduled
The post-barrier-flush is sent by md as soon as make_request on the barrier write completes. For raid5, the data might not be in the per-device queues yet. So for barrier requests, wait for any pre-reading to be done so that the request will be in the per-device queues. We use the 'preread_active' count to check that nothing is still in the preread phase, and delay the decrement of this count until after write requests have been submitted to the underlying devices. Signed-off-by: NeilBrown <neilb@suse.de>
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