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

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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>
This commit is contained in:
Dan Williams 2007-01-02 13:52:31 -07:00
parent e89f89629b
commit b5e98d65d3
2 changed files with 26 additions and 29 deletions
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2
include/linux/raid/raid5.h
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@ -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;
};