[PATCH 1/3 v2] imsm: introduce get_disk_slot_in_dev()

[Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>]

The routine was added to remove unnecessary get_imsm_dev() and
get_imsm_map() calls, used only to determine disk slot.

Additionally, enum for IMSM return statues was added for further usage.

Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
---
 super-intel.c | 47 ++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 36 insertions(+), 11 deletions(-)

diff --git a/super-intel.c b/super-intel.c
index d5fad102..f0196948 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -366,6 +366,18 @@ struct migr_record {
 };
 ASSERT_SIZE(migr_record, 128)
 
+/**
+ * enum imsm_status - internal IMSM return values representation.
+ * @STATUS_OK: function succeeded.
+ * @STATUS_ERROR: General error ocurred (not specified).
+ *
+ * Typedefed to imsm_status_t.
+ */
+typedef enum imsm_status {
+	IMSM_STATUS_ERROR = -1,
+	IMSM_STATUS_OK = 0,
+} imsm_status_t;
+
 struct md_list {
 	/* usage marker:
 	 *  1: load metadata
@@ -1151,7 +1163,7 @@ static void set_imsm_ord_tbl_ent(struct imsm_map *map, int slot, __u32 ord)
 	map->disk_ord_tbl[slot] = __cpu_to_le32(ord);
 }
 
-static int get_imsm_disk_slot(struct imsm_map *map, unsigned idx)
+static int get_imsm_disk_slot(struct imsm_map *map, const unsigned int idx)
 {
 	int slot;
 	__u32 ord;
@@ -1162,7 +1174,7 @@ static int get_imsm_disk_slot(struct imsm_map *map, unsigned idx)
 			return slot;
 	}
 
-	return -1;
+	return IMSM_STATUS_ERROR;
 }
 
 static int get_imsm_raid_level(struct imsm_map *map)
@@ -1177,6 +1189,23 @@ static int get_imsm_raid_level(struct imsm_map *map)
 	return map->raid_level;
 }
 
+/**
+ * get_disk_slot_in_dev() - retrieve disk slot from &imsm_dev.
+ * @super: &intel_super pointer, not NULL.
+ * @dev_idx: imsm device index.
+ * @idx: disk index.
+ *
+ * Return: Slot on success, IMSM_STATUS_ERROR otherwise.
+ */
+static int get_disk_slot_in_dev(struct intel_super *super, const __u8 dev_idx,
+				const unsigned int idx)
+{
+	struct imsm_dev *dev = get_imsm_dev(super, dev_idx);
+	struct imsm_map *map = get_imsm_map(dev, MAP_0);
+
+	return get_imsm_disk_slot(map, idx);
+}
+
 static int cmp_extent(const void *av, const void *bv)
 {
 	const struct extent *a = av;
@@ -1193,13 +1222,9 @@ static int count_memberships(struct dl *dl, struct intel_super *super)
 	int memberships = 0;
 	int i;
 
-	for (i = 0; i < super->anchor->num_raid_devs; i++) {
-		struct imsm_dev *dev = get_imsm_dev(super, i);
-		struct imsm_map *map = get_imsm_map(dev, MAP_0);
-
-		if (get_imsm_disk_slot(map, dl->index) >= 0)
+	for (i = 0; i < super->anchor->num_raid_devs; i++)
+		if (get_disk_slot_in_dev(super, i, dl->index) >= 0)
 			memberships++;
-	}
 
 	return memberships;
 }
@@ -1909,6 +1934,7 @@ void examine_migr_rec_imsm(struct intel_super *super)
 
 		/* first map under migration */
 		map = get_imsm_map(dev, MAP_0);
+
 		if (map)
 			slot = get_imsm_disk_slot(map, super->disks->index);
 		if (map == NULL || slot > 1 || slot < 0) {
@@ -9629,10 +9655,9 @@ static int apply_update_activate_spare(struct imsm_update_activate_spare *u,
 		/* count arrays using the victim in the metadata */
 		found = 0;
 		for (a = active_array; a ; a = a->next) {
-			dev = get_imsm_dev(super, a->info.container_member);
-			map = get_imsm_map(dev, MAP_0);
+			int dev_idx = a->info.container_member;
 
-			if (get_imsm_disk_slot(map, victim) >= 0)
+			if (get_disk_slot_in_dev(super, dev_idx, victim) >= 0)
 				found++;
 		}
 
-- 
2.26.2