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| author | Dan Williams <dan.j.williams@intel.com> | 2009-07-14 20:40:19 (GMT) |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-08-30 02:13:12 (GMT) |
| commit | ac6b53b6e6acab27e4f3e2383f9ac1f0d7c6200b (patch) | |
| tree | e9c67502fd32a9eea4902ea382e51eecb09f2a54 /drivers/md/Kconfig | |
| parent | 4e7d2c0aefb77f7b24942e5af042a083be4d60bb (diff) | |
| download | linux-ac6b53b6e6acab27e4f3e2383f9ac1f0d7c6200b.tar.xz | |
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/Kconfig')
| -rw-r--r-- | drivers/md/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 41b3ae2..abb8636 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -124,6 +124,8 @@ config MD_RAID456 select MD_RAID6_PQ select ASYNC_MEMCPY select ASYNC_XOR + select ASYNC_PQ + select ASYNC_RAID6_RECOV ---help--- A RAID-5 set of N drives with a capacity of C MB per drive provides the capacity of C * (N - 1) MB, and protects against a failure |