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| author | Dan Williams <dan.j.williams@intel.com> | 2009-07-14 12:20:37 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-08-29 19:09:27 -0700 |
| commit | 0a82a6239beecc95db6e05fe43ee62d16b381d38 (patch) | |
| tree | 524f6417ae8128f5b1da322872e860bd4af5840d /crypto/async_tx/Kconfig | |
| parent | b2f46fd8ef3dff2ab30f31126833f78b7480283a (diff) | |
| download | linux-0a82a6239beecc95db6e05fe43ee62d16b381d38.tar.gz linux-0a82a6239beecc95db6e05fe43ee62d16b381d38.tar.bz2 linux-0a82a6239beecc95db6e05fe43ee62d16b381d38.zip | |
async_tx: add support for asynchronous RAID6 recovery operations
async_raid6_2data_recov() recovers two data disk failures
async_raid6_datap_recov() recovers a data disk and the P disk
These routines are a port of the synchronous versions found in
drivers/md/raid6recov.c. The primary difference is breaking out the xor
operations into separate calls to async_xor. Two helper routines are
introduced to perform scalar multiplication where needed.
async_sum_product() multiplies two sources by scalar coefficients and
then sums (xor) the result. async_mult() simply multiplies a single
source by a scalar.
This implemention also includes, in contrast to the original
synchronous-only code, special case handling for the 4-disk and 5-disk
array cases. In these situations the default N-disk algorithm will
present 0-source or 1-source operations to dma devices. To cover for
dma devices where the minimum source count is 2 we implement 4-disk and
5-disk handling in the recovery code.
[ Impact: asynchronous raid6 recovery routines for 2data and datap cases ]
Cc: Yuri Tikhonov <yur@emcraft.com>
Cc: Ilya Yanok <yanok@emcraft.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Andre Noll <maan@systemlinux.org>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'crypto/async_tx/Kconfig')
| -rw-r--r-- | crypto/async_tx/Kconfig | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig index cb6d7314f198..e5aeb2b79e6f 100644 --- a/crypto/async_tx/Kconfig +++ b/crypto/async_tx/Kconfig @@ -18,3 +18,8 @@ config ASYNC_PQ tristate select ASYNC_CORE +config ASYNC_RAID6_RECOV + tristate + select ASYNC_CORE + select ASYNC_PQ + |