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md/raid5,6: common schedule_reconstruction for raid5/6 

Extend schedule_reconstruction5 for reuse by the raid6 path.  Add
support for generating Q and BUG() if a request is made to perform
'prexor'.

Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Yuri Tikhonov 2009-08-29 19:13:12 -07:00 committed by Dan Williams
parent ac6b53b6e6
commit c0f7bddbe6
1 changed files with 18 additions and 6 deletions
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24
drivers/md/raid5.c
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@ -2175,10 +2175,12 @@ static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2)
}
static void
schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s,
schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s,
int rcw, int expand)
{
int i, pd_idx = sh->pd_idx, disks = sh->disks;
raid5_conf_t *conf = sh->raid_conf;
int level = conf->level;
if (rcw) {
/* if we are not expanding this is a proper write request, and
@ -2204,10 +2206,11 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s,
s->locked++;
}
}
if (s->locked + 1 == disks)
if (s->locked + conf->max_degraded == disks)
if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state))
atomic_inc(&sh->raid_conf->pending_full_writes);
atomic_inc(&conf->pending_full_writes);
} else {
BUG_ON(level == 6);
BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) ||
test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags)));
@ -2232,13 +2235,22 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s,
}
}
/* keep the parity disk locked while asynchronous operations
/* keep the parity disk(s) locked while asynchronous operations
* are in flight
*/
set_bit(R5_LOCKED, &sh->dev[pd_idx].flags);
clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags);
s->locked++;
if (level == 6) {
int qd_idx = sh->qd_idx;
struct r5dev *dev = &sh->dev[qd_idx];
set_bit(R5_LOCKED, &dev->flags);
clear_bit(R5_UPTODATE, &dev->flags);
s->locked++;
}
pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n",
__func__, (unsigned long long)sh->sector,
s->locked, s->ops_request);
@ -2704,7 +2716,7 @@ static void handle_stripe_dirtying5(raid5_conf_t *conf,
if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) &&
(s->locked == 0 && (rcw == 0 || rmw == 0) &&
!test_bit(STRIPE_BIT_DELAY, &sh->state)))
schedule_reconstruction5(sh, s, rcw == 0, 0);
schedule_reconstruction(sh, s, rcw == 0, 0);
}
static void handle_stripe_dirtying6(raid5_conf_t *conf,
@ -3309,7 +3321,7 @@ static bool handle_stripe5(struct stripe_head *sh)
/* Need to write out all blocks after computing parity */
sh->disks = conf->raid_disks;
stripe_set_idx(sh->sector, conf, 0, sh);
schedule_reconstruction5(sh, &s, 1, 1);
schedule_reconstruction(sh, &s, 1, 1);
} else if (s.expanded && !sh->reconstruct_state && s.locked == 0) {
clear_bit(STRIPE_EXPAND_READY, &sh->state);
atomic_dec(&conf->reshape_stripes);