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| author |   Dan Williams <dan.j.williams@intel.com> | 2007-07-09 11:56:43 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2007-07-13 08:06:15 -0700 |
| commit | a445685647e825c713175d180ffc8dd54d90589b (patch) | |
| tree | d2db5674e51d33162e1e5993b6e6680ec534e2df /include/linux/raid | |
| parent | async_tx: add the async_tx api (diff) | |
| download | linux-dev-a445685647e825c713175d180ffc8dd54d90589b.tar.xz linux-dev-a445685647e825c713175d180ffc8dd54d90589b.zip | |
raid5: refactor handle_stripe5 and handle_stripe6 (v3)
handle_stripe5 and handle_stripe6 have very deep logic paths handling the
various states of a stripe_head. By introducing the 'stripe_head_state'
and 'r6_state' objects, large portions of the logic can be moved to
sub-routines.
'struct stripe_head_state' consumes all of the automatic variables that previously
stood alone in handle_stripe5,6. 'struct r6_state' contains the handle_stripe6
specific variables like p_failed and q_failed.
One of the nice side effects of the 'stripe_head_state' change is that it
allows for further reductions in code duplication between raid5 and raid6.
The following new routines are shared between raid5 and raid6:
handle_completed_write_requests
handle_requests_to_failed_array
handle_stripe_expansion
Changes:
* v2: fixed 'conf->raid_disk-1' for the raid6 'handle_stripe_expansion' path
* v3: removed the unused 'dirty' field from struct stripe_head_state
* v3: coalesced open coded bi_end_io routines into return_io()
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-By: NeilBrown <neilb@suse.de>
Diffstat (limited to 'include/linux/raid')
| -rw-r--r-- | include/linux/raid/raid5.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h index d8286db60b96..b99d354f6128 100644 --- a/include/linux/raid/raid5.h +++ b/include/linux/raid/raid5.h @@ -145,6 +145,22 @@ struct stripe_head { unsigned long flags; } dev[1]; /* allocated with extra space depending of RAID geometry */ }; + +/* stripe_head_state - collects and tracks the dynamic state of a stripe_head + * for handle_stripe. It is only valid under spin_lock(sh->lock); + */ +struct stripe_head_state { + int syncing, expanding, expanded; + int locked, uptodate, to_read, to_write, failed, written; + int non_overwrite; + int failed_num; +}; + +/* r6_state - extra state data only relevant to r6 */ +struct r6_state { + int p_failed, q_failed, qd_idx, failed_num[2]; +}; + /* Flags */ #define R5_UPTODATE 0 /* page contains current data */ #define R5_LOCKED 1 /* IO has been submitted on "req" */ |