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| author | NeilBrown <neilb@suse.de> | 2009-10-16 16:27:34 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2009-10-16 16:27:34 +1100 |
| commit | e4424fee1815f996dccd36be44d68ca160ec3e1b (patch) | |
| tree | 13e67731367d28451fdb1dcfbf4e085ce236f9b9 /drivers/md/raid5.c | |
| parent | 417b8d4ac868cf58d6c68f52d72f7648413e0edc (diff) | |
| download | lwn-e4424fee1815f996dccd36be44d68ca160ec3e1b.tar.gz lwn-e4424fee1815f996dccd36be44d68ca160ec3e1b.zip | |
md: fix problems with RAID6 calculations for DDF.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 25c3c29134d1..d4ce51b4d41b 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -158,11 +158,14 @@ static int raid6_idx_to_slot(int idx, struct stripe_head *sh, { int slot; + if (sh->ddf_layout) + slot = (*count)++; if (idx == sh->pd_idx) return syndrome_disks; if (idx == sh->qd_idx) return syndrome_disks + 1; - slot = (*count)++; + if (!sh->ddf_layout) + slot = (*count)++; return slot; } @@ -727,9 +730,8 @@ static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh) srcs[slot] = sh->dev[i].page; i = raid6_next_disk(i, disks); } while (i != d0_idx); - BUG_ON(count != syndrome_disks); - return count; + return syndrome_disks; } static struct dma_async_tx_descriptor * @@ -828,7 +830,6 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) failb = slot; i = raid6_next_disk(i, disks); } while (i != d0_idx); - BUG_ON(count != syndrome_disks); BUG_ON(faila == failb); if (failb < faila) @@ -845,7 +846,7 @@ ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) init_async_submit(&submit, ASYNC_TX_FENCE, NULL, ops_complete_compute, sh, to_addr_conv(sh, percpu)); - return async_gen_syndrome(blocks, 0, count+2, + return async_gen_syndrome(blocks, 0, syndrome_disks+2, STRIPE_SIZE, &submit); } else { struct page *dest; @@ -1935,10 +1936,15 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) case ALGORITHM_PARITY_N: break; case ALGORITHM_ROTATING_N_CONTINUE: + /* Like left_symmetric, but P is before Q */ if (sh->pd_idx == 0) i--; /* P D D D Q */ - else if (i > sh->pd_idx) - i -= 2; /* D D Q P D */ + else { + /* D D Q P D */ + if (i < sh->pd_idx) + i += raid_disks; + i -= (sh->pd_idx + 1); + } break; case ALGORITHM_LEFT_ASYMMETRIC_6: case ALGORITHM_RIGHT_ASYMMETRIC_6: |