md: handle_stripe5 - request io processing in raid5_run_ops

I/O submission requests were already handled outside of the stripe lock in
handle_stripe.  Now that handle_stripe is only tasked with finding work,
this logic belongs in raid5_run_ops.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-By: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c6e0e2b..7e1cc07 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2326,6 +2326,9 @@ static void handle_issuing_new_write_requests5(raid5_conf_t *conf,
                                                "%d for r-m-w\n", i);
                                        set_bit(R5_LOCKED, &dev->flags);
                                        set_bit(R5_Wantread, &dev->flags);
+                                       if (!test_and_set_bit(
+                                               STRIPE_OP_IO, &sh->ops.pending))
+                                               sh->ops.count++;
                                        s->locked++;
                                } else {
                                        set_bit(STRIPE_DELAYED, &sh->state);
@@ -2349,6 +2352,9 @@ static void handle_issuing_new_write_requests5(raid5_conf_t *conf,
                                                "%d for Reconstruct\n", i);
                                        set_bit(R5_LOCKED, &dev->flags);
                                        set_bit(R5_Wantread, &dev->flags);
+                                       if (!test_and_set_bit(
+                                               STRIPE_OP_IO, &sh->ops.pending))
+                                               sh->ops.count++;
                                        s->locked++;
                                } else {
                                        set_bit(STRIPE_DELAYED, &sh->state);
@@ -2545,6 +2551,9 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh,
 
                set_bit(R5_LOCKED, &dev->flags);
                set_bit(R5_Wantwrite, &dev->flags);
+               if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending))
+                       sh->ops.count++;
+
                clear_bit(STRIPE_DEGRADED, &sh->state);
                s->locked++;
                set_bit(STRIPE_INSYNC, &sh->state);
@@ -2930,12 +2939,16 @@ static void handle_stripe5(struct stripe_head *sh)
                dev = &sh->dev[s.failed_num];
                if (!test_bit(R5_ReWrite, &dev->flags)) {
                        set_bit(R5_Wantwrite, &dev->flags);
+                       if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending))
+                               sh->ops.count++;
                        set_bit(R5_ReWrite, &dev->flags);
                        set_bit(R5_LOCKED, &dev->flags);
                        s.locked++;
                } else {
                        /* let's read it back */
                        set_bit(R5_Wantread, &dev->flags);
+                       if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending))
+                               sh->ops.count++;
                        set_bit(R5_LOCKED, &dev->flags);
                        s.locked++;
                }
@@ -2988,64 +3001,6 @@ static void handle_stripe5(struct stripe_head *sh)
 
        return_io(return_bi);
 
-       for (i=disks; i-- ;) {
-               int rw;
-               struct bio *bi;
-               mdk_rdev_t *rdev;
-               if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags))
-                       rw = WRITE;
-               else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags))
-                       rw = READ;
-               else
-                       continue;
- 
-               bi = &sh->dev[i].req;
- 
-               bi->bi_rw = rw;
-               if (rw == WRITE)
-                       bi->bi_end_io = raid5_end_write_request;
-               else
-                       bi->bi_end_io = raid5_end_read_request;
- 
-               rcu_read_lock();
-               rdev = rcu_dereference(conf->disks[i].rdev);
-               if (rdev && test_bit(Faulty, &rdev->flags))
-                       rdev = NULL;
-               if (rdev)
-                       atomic_inc(&rdev->nr_pending);
-               rcu_read_unlock();
- 
-               if (rdev) {
-                       if (s.syncing || s.expanding || s.expanded)
-                               md_sync_acct(rdev->bdev, STRIPE_SECTORS);
-
-                       bi->bi_bdev = rdev->bdev;
-                       pr_debug("for %llu schedule op %ld on disc %d\n",
-                               (unsigned long long)sh->sector, bi->bi_rw, i);
-                       atomic_inc(&sh->count);
-                       bi->bi_sector = sh->sector + rdev->data_offset;
-                       bi->bi_flags = 1 << BIO_UPTODATE;
-                       bi->bi_vcnt = 1;        
-                       bi->bi_max_vecs = 1;
-                       bi->bi_idx = 0;
-                       bi->bi_io_vec = &sh->dev[i].vec;
-                       bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
-                       bi->bi_io_vec[0].bv_offset = 0;
-                       bi->bi_size = STRIPE_SIZE;
-                       bi->bi_next = NULL;
-                       if (rw == WRITE &&
-                           test_bit(R5_ReWrite, &sh->dev[i].flags))
-                               atomic_add(STRIPE_SECTORS, &rdev->corrected_errors);
-                       generic_make_request(bi);
-               } else {
-                       if (rw == WRITE)
-                               set_bit(STRIPE_DEGRADED, &sh->state);
-                       pr_debug("skip op %ld on disc %d for sector %llu\n",
-                               bi->bi_rw, i, (unsigned long long)sh->sector);
-                       clear_bit(R5_LOCKED, &sh->dev[i].flags);
-                       set_bit(STRIPE_HANDLE, &sh->state);
-               }
-       }
 }
 
 static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)