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async_tx: add sum check flags

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Replace the flat zero_sum_result with a collection of flags to contain
the P (xor) zero-sum result, and the soon to be utilized Q (raid6 reed
solomon syndrome) zero-sum result.  Use the SUM_CHECK_ namespace instead
of DMA_ since these flags will be used on non-dma-zero-sum enabled
platforms.

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>
This commit is contained in:
Dan Williams
2009-08-29 19:09:26 -07:00
parent d6f38f31f3
commit ad283ea4a3
7 changed files with 37 additions and 14 deletions
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4
crypto/async_tx/async_xor.c
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@@ -246,7 +246,7 @@ static int page_is_zero(struct page *p, unsigned int offset, size_t len)
*/
struct dma_async_tx_descriptor *
async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
int src_cnt, size_t len, u32 *result,
int src_cnt, size_t len, enum sum_check_flags *result,
struct async_submit_ctl *submit)
{
struct dma_chan *chan = async_tx_find_channel(submit, DMA_XOR_VAL,
@@ -304,7 +304,7 @@ async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
async_tx_quiesce(&tx);
*result = page_is_zero(dest, offset, len) ? 0 : 1;
*result = !page_is_zero(dest, offset, len) << SUM_CHECK_P;
async_tx_sync_epilog(submit);
submit->flags = flags_orig;