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| author | Dan Williams <dan.j.williams@intel.com> | 2009-07-14 13:40:19 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-08-29 19:13:12 -0700 |
| commit | ac6b53b6e6acab27e4f3e2383f9ac1f0d7c6200b (patch) | |
| tree | e9c67502fd32a9eea4902ea382e51eecb09f2a54 /drivers/md/raid5.h | |
| parent | 4e7d2c0aefb77f7b24942e5af042a083be4d60bb (diff) | |
| download | lwn-ac6b53b6e6acab27e4f3e2383f9ac1f0d7c6200b.tar.gz lwn-ac6b53b6e6acab27e4f3e2383f9ac1f0d7c6200b.zip | |
md/raid6: asynchronous raid6 operations
[ Based on an original patch by Yuri Tikhonov ]
The raid_run_ops routine uses the asynchronous offload api and
the stripe_operations member of a stripe_head to carry out xor+pq+copy
operations asynchronously, outside the lock.
The operations performed by RAID-6 are the same as in the RAID-5 case
except for no support of STRIPE_OP_PREXOR operations. All the others
are supported:
STRIPE_OP_BIOFILL
- copy data into request buffers to satisfy a read request
STRIPE_OP_COMPUTE_BLK
- generate missing blocks (1 or 2) in the cache from the other blocks
STRIPE_OP_BIODRAIN
- copy data out of request buffers to satisfy a write request
STRIPE_OP_RECONSTRUCT
- recalculate parity for new data that has entered the cache
STRIPE_OP_CHECK
- verify that the parity is correct
The flow is the same as in the RAID-5 case, and reuses some routines, namely:
1/ ops_complete_postxor (renamed to ops_complete_reconstruct)
2/ ops_complete_compute (updated to set up to 2 targets uptodate)
3/ ops_run_check (renamed to ops_run_check_p for xor parity checks)
[neilb@suse.de: fixes to get it to pass mdadm regression suite]
Reviewed-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md/raid5.h')
| -rw-r--r-- | drivers/md/raid5.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 75f2c6c4cf90..116d0b44b2a9 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -176,7 +176,9 @@ */ enum check_states { check_state_idle = 0, - check_state_run, /* parity check */ + check_state_run, /* xor parity check */ + check_state_run_q, /* q-parity check */ + check_state_run_pq, /* pq dual parity check */ check_state_check_result, check_state_compute_run, /* parity repair */ check_state_compute_result, @@ -216,7 +218,7 @@ struct stripe_head { * @target - STRIPE_OP_COMPUTE_BLK target */ struct stripe_operations { - int target; + int target, target2; enum sum_check_flags zero_sum_result; } ops; struct r5dev { @@ -299,7 +301,7 @@ struct r6_state { #define STRIPE_OP_COMPUTE_BLK 1 #define STRIPE_OP_PREXOR 2 #define STRIPE_OP_BIODRAIN 3 -#define STRIPE_OP_POSTXOR 4 +#define STRIPE_OP_RECONSTRUCT 4 #define STRIPE_OP_CHECK 5 /* |