dm path selector: remove 'repeat_count' return from .select_path hook

If a path selector has any use for a repeat_count it should be handled
locally and not depend on the dm-mpath core to be concerned with it.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-mpath.c

@@ -318,9 +318,8 @@ static int __choose_path_in_pg(struct multipath *m, struct priority_group *pg,
 			       size_t nr_bytes)
 {
 	struct dm_path *path;
-	unsigned repeat_count;
 
-	path = pg->ps.type->select_path(&pg->ps, &repeat_count, nr_bytes);
+	path = pg->ps.type->select_path(&pg->ps, nr_bytes);
 	if (!path)
 		return -ENXIO;
 

drivers/md/dm-path-selector.h

@@ -50,13 +50,8 @@ struct path_selector_type {
 	/*
 	 * Chooses a path for this io, if no paths are available then
 	 * NULL will be returned.
-	 *
-	 * repeat_count is the number of times to use the path before
-	 * calling the function again.  0 means don't call it again unless
-	 * the path fails.
 	 */
 	struct dm_path *(*select_path) (struct path_selector *ps,
-					unsigned *repeat_count,
 					size_t nr_bytes);
 
 	/*

drivers/md/dm-queue-length.c

@@ -184,8 +184,7 @@ static int ql_reinstate_path(struct path_selector *ps, struct dm_path *path)
 /*
  * Select a path having the minimum number of in-flight I/Os
  */
-static struct dm_path *ql_select_path(struct path_selector *ps,
+static struct dm_path *ql_select_path(struct path_selector *ps, size_t nr_bytes)
-				      unsigned *repeat_count, size_t nr_bytes)
 {
 	struct selector *s = ps->context;
 	struct path_info *pi = NULL, *best = NULL;
@@ -211,8 +210,6 @@ static struct dm_path *ql_select_path(struct path_selector *ps,
 	if (!best)
 		goto out;
 
-	*repeat_count = best->repeat_count;
-
 	ret = best->path;
 out:
 	spin_unlock_irqrestore(&s->lock, flags);

drivers/md/dm-round-robin.c

@@ -178,8 +178,7 @@ static int rr_reinstate_path(struct path_selector *ps, struct dm_path *p)
 	return 0;
 }
 
-static struct dm_path *rr_select_path(struct path_selector *ps,
+static struct dm_path *rr_select_path(struct path_selector *ps, size_t nr_bytes)
-				      unsigned *repeat_count, size_t nr_bytes)
 {
 	unsigned long flags;
 	struct selector *s = ps->context;
@@ -189,7 +188,6 @@ static struct dm_path *rr_select_path(struct path_selector *ps,
 	if (!list_empty(&s->valid_paths)) {
 		pi = list_entry(s->valid_paths.next, struct path_info, list);
 		list_move_tail(&pi->list, &s->valid_paths);
-		*repeat_count = pi->repeat_count;
 	}
 	spin_unlock_irqrestore(&s->lock, flags);
 

drivers/md/dm-service-time.c

@@ -271,8 +271,7 @@ static int st_compare_load(struct path_info *pi1, struct path_info *pi2,
 	return pi2->relative_throughput - pi1->relative_throughput;
 }
 
-static struct dm_path *st_select_path(struct path_selector *ps,
+static struct dm_path *st_select_path(struct path_selector *ps, size_t nr_bytes)
-				      unsigned *repeat_count, size_t nr_bytes)
 {
 	struct selector *s = ps->context;
 	struct path_info *pi = NULL, *best = NULL;
@@ -293,8 +292,6 @@ static struct dm_path *st_select_path(struct path_selector *ps,
 	if (!best)
 		goto out;
 
-	*repeat_count = best->repeat_count;
-
 	ret = best->path;
 out:
 	spin_unlock_irqrestore(&s->lock, flags);