diff options
| -rw-r--r-- | drivers/md/raid5.c | 84 |
1 files changed, 65 insertions, 19 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 42439a4c1c5..810cf831edd 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2471,26 +2471,67 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, struct stripe_head_state *s, int disks) { set_bit(STRIPE_HANDLE, &sh->state); - if (s->failed == 0) { - BUG_ON(s->uptodate != disks); - compute_parity5(sh, CHECK_PARITY); - s->uptodate--; - if (page_is_zero(sh->dev[sh->pd_idx].page)) { - /* parity is correct (on disc, not in buffer any more) - */ - set_bit(STRIPE_INSYNC, &sh->state); - } else { - conf->mddev->resync_mismatches += STRIPE_SECTORS; - if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) - /* don't try to repair!! */ + /* Take one of the following actions: + * 1/ start a check parity operation if (uptodate == disks) + * 2/ finish a check parity operation and act on the result + * 3/ skip to the writeback section if we previously + * initiated a recovery operation + */ + if (s->failed == 0 && + !test_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending)) { + if (!test_and_set_bit(STRIPE_OP_CHECK, &sh->ops.pending)) { + BUG_ON(s->uptodate != disks); + clear_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags); + sh->ops.count++; + s->uptodate--; + } else if ( + test_and_clear_bit(STRIPE_OP_CHECK, &sh->ops.complete)) { + clear_bit(STRIPE_OP_CHECK, &sh->ops.ack); + clear_bit(STRIPE_OP_CHECK, &sh->ops.pending); + + if (sh->ops.zero_sum_result == 0) + /* parity is correct (on disc, + * not in buffer any more) + */ set_bit(STRIPE_INSYNC, &sh->state); else { - compute_block(sh, sh->pd_idx); - s->uptodate++; + conf->mddev->resync_mismatches += + STRIPE_SECTORS; + if (test_bit( + MD_RECOVERY_CHECK, &conf->mddev->recovery)) + /* don't try to repair!! */ + set_bit(STRIPE_INSYNC, &sh->state); + else { + set_bit(STRIPE_OP_COMPUTE_BLK, + &sh->ops.pending); + set_bit(STRIPE_OP_MOD_REPAIR_PD, + &sh->ops.pending); + set_bit(R5_Wantcompute, + &sh->dev[sh->pd_idx].flags); + sh->ops.target = sh->pd_idx; + sh->ops.count++; + s->uptodate++; + } } } } - if (!test_bit(STRIPE_INSYNC, &sh->state)) { + + /* check if we can clear a parity disk reconstruct */ + if (test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete) && + test_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending)) { + + clear_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending); + clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.complete); + clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.ack); + clear_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending); + } + + /* Wait for check parity and compute block operations to complete + * before write-back + */ + if (!test_bit(STRIPE_INSYNC, &sh->state) && + !test_bit(STRIPE_OP_CHECK, &sh->ops.pending) && + !test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending)) { struct r5dev *dev; /* either failed parity check, or recovery is happening */ if (s->failed == 0) @@ -2855,12 +2896,17 @@ static void handle_stripe5(struct stripe_head *sh) handle_issuing_new_write_requests5(conf, sh, &s, disks); /* maybe we need to check and possibly fix the parity for this stripe - * Any reads will already have been scheduled, so we just see if enough data - * is available + * Any reads will already have been scheduled, so we just see if enough + * data is available. The parity check is held off while parity + * dependent operations are in flight. */ - if (s.syncing && s.locked == 0 && - !test_bit(STRIPE_INSYNC, &sh->state)) + if ((s.syncing && s.locked == 0 && + !test_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending) && + !test_bit(STRIPE_INSYNC, &sh->state)) || + test_bit(STRIPE_OP_CHECK, &sh->ops.pending) || + test_bit(STRIPE_OP_MOD_REPAIR_PD, &sh->ops.pending)) handle_parity_checks5(conf, sh, &s, disks); + if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { md_done_sync(conf->mddev, STRIPE_SECTORS,1); clear_bit(STRIPE_SYNCING, &sh->state); |