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raid6/async_tx: handle holes in block list in async_syndrome_val

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async_syndrome_val check the P and Q blocks used for RAID6
calculations.
With DDF raid6, some of the data blocks might be NULL, so
this needs to be handled in the same way that async_gen_syndrome
handles it.

As async_syndrome_val calls async_xor, also enhance async_xor
to detect and skip NULL blocks in the list.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-10-16 16:40:34 +11:00
parent 5dd33c9a4c
commit b2141e6951
2 changed files with 35 additions and 14 deletions
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31
crypto/async_tx/async_pq.c
View file

@ -260,8 +260,10 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
len);
struct dma_device *device = chan ? chan->device : NULL;
struct dma_async_tx_descriptor *tx;
unsigned char coefs[disks-2];
enum dma_ctrl_flags dma_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0;
dma_addr_t *dma_src = NULL;
int src_cnt = 0;
BUG_ON(disks < 4);
@ -280,20 +282,35 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
__func__, disks, len);
if (!P(blocks, disks))
dma_flags |= DMA_PREP_PQ_DISABLE_P;
else
pq[0] = dma_map_page(dev, P(blocks,disks),
offset, len,
DMA_TO_DEVICE);
if (!Q(blocks, disks))
dma_flags |= DMA_PREP_PQ_DISABLE_Q;
else
pq[1] = dma_map_page(dev, Q(blocks,disks),
offset, len,
DMA_TO_DEVICE);
if (submit->flags & ASYNC_TX_FENCE)
dma_flags |= DMA_PREP_FENCE;
for (i = 0; i < disks; i++)
if (likely(blocks[i]))
dma_src[i] = dma_map_page(dev, blocks[i],
offset, len,
DMA_TO_DEVICE);
for (i = 0; i < disks-2; i++)
if (likely(blocks[i])) {
dma_src[src_cnt] = dma_map_page(dev, blocks[i],
offset, len,
DMA_TO_DEVICE);
coefs[src_cnt] = raid6_gfexp[i];
src_cnt++;
}
pq[1] = dma_map_page(dev, Q(blocks,disks),
offset, len,
DMA_TO_DEVICE);
for (;;) {
tx = device->device_prep_dma_pq_val(chan, pq, dma_src,
disks - 2,
raid6_gfexp,
src_cnt,
coefs,
len, pqres,
dma_flags);
if (likely(tx))

18
crypto/async_tx/async_xor.c
View file

@ -44,20 +44,23 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list,
void *cb_param_orig = submit->cb_param;
enum async_tx_flags flags_orig = submit->flags;
enum dma_ctrl_flags dma_flags;
int xor_src_cnt;
int xor_src_cnt = 0;
dma_addr_t dma_dest;
/* map the dest bidrectional in case it is re-used as a source */
dma_dest = dma_map_page(dma->dev, dest, offset, len, DMA_BIDIRECTIONAL);
for (i = 0; i < src_cnt; i++) {
/* only map the dest once */
if (!src_list[i])
continue;
if (unlikely(src_list[i] == dest)) {
dma_src[i] = dma_dest;
dma_src[xor_src_cnt++] = dma_dest;
continue;
}
dma_src[i] = dma_map_page(dma->dev, src_list[i], offset,
len, DMA_TO_DEVICE);
dma_src[xor_src_cnt++] = dma_map_page(dma->dev, src_list[i], offset,
len, DMA_TO_DEVICE);
}
src_cnt = xor_src_cnt;
while (src_cnt) {
submit->flags = flags_orig;
@ -123,7 +126,7 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset,
int src_cnt, size_t len, struct async_submit_ctl *submit)
{
int i;
int xor_src_cnt;
int xor_src_cnt = 0;
int src_off = 0;
void *dest_buf;
void **srcs;
@ -135,8 +138,9 @@ do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset,
/* convert to buffer pointers */
for (i = 0; i < src_cnt; i++)
srcs[i] = page_address(src_list[i]) + offset;
if (src_list[i])
srcs[xor_src_cnt++] = page_address(src_list[i]) + offset;
src_cnt = xor_src_cnt;
/* set destination address */
dest_buf = page_address(dest) + offset;