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authorDan Williams <dan.j.williams@intel.com>2007-01-02 13:52:30 -0700
committerDan Williams <dan.j.williams@intel.com>2007-07-13 08:06:16 -0700
commitd84e0f10d38393f617227f0c831a99c69294651f (patch)
tree5d0836f024f1f13ac6f1b2b2d3004244cb0fa649 /net
parent91c00924846a0034020451c280c76baa4299f9dc (diff)
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md: common infrastructure for running operations with raid5_run_ops
All the handle_stripe operations that are to be transitioned to use raid5_run_ops need a method to coherently gather work under the stripe-lock and hand that work off to raid5_run_ops. The 'get_stripe_work' routine runs under the lock to read all the bits in sh->ops.pending that do not have the corresponding bit set in sh->ops.ack. This modified 'pending' bitmap is then passed to raid5_run_ops for processing. The transition from 'ack' to 'completion' does not need similar protection as the existing release_stripe infrastructure will guarantee that handle_stripe will run again after a completion bit is set, and handle_stripe can tolerate a sh->ops.completed bit being set while the lock is held. A call to async_tx_issue_pending_all() is added to raid5d to kick the offload engines once all pending stripe operations work has been submitted. This enables batching of the submission and completion of operations. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-By: NeilBrown <neilb@suse.de>
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