md: handle_stripe5 - add request/completion logic for async read ops

When a read bio is attached to the stripe and the corresponding block is
marked R5_UPTODATE, then a read (biofill) operation is scheduled to copy
the data from the stripe cache to the bio buffer.  handle_stripe flags the
blocks to be operated on with the R5_Wantfill flag.  If new read requests
arrive while raid5_run_ops is running they will not be handled until
handle_stripe is scheduled to run again.

Changelog:
* cleanup to_read and to_fill accounting
* do not fail reads that have reached the cache

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-By: NeilBrown <neilb@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index 2293015de1d5..93678f57ccbe 100644
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -200,7 +200,7 @@ struct stripe_head {
 struct stripe_head_state {
         int syncing, expanding, expanded;
         int locked, uptodate, to_read, to_write, failed, written;
-        int compute, req_compute, non_overwrite;
+        int to_fill, compute, req_compute, non_overwrite;
         int failed_num;
 };