Factor out the alloc part of fellow_busy_region_alloc()

src/fellow_cache.c

@@ -2165,6 +2165,23 @@ fellow_busy_obj_alloc(struct fellow_cache *fc,
 	return (FCR_OK(fbo));
 }
 
+/* this exists to wrap FC_INJ code */
+
+static struct buddy_off_extent
+fellow_region_alloc(const struct fellow_cache *fc, size_t size, int8_t cram)
+{
+
+	CHECK_OBJ_NOTNULL(fc, FELLOW_CACHE_MAGIC);
+	AN(size);
+
+	if (cram)
+		FC_INJ_SZLIM(size);
+
+	return (FC_INJ ? buddy_off_extent_nil :
+	    buddy_alloc1_off_extent_wait(fellow_dskbuddy(fc->ffd),
+	    FEP_SPC, size, cram));
+}
+
 /* allocate a new region for body, aux attr or seglist
  *
  * aux attr use: We do not yet coalesce allocations because
@@ -2175,21 +2192,10 @@ static struct buddy_off_extent *
 fellow_busy_region_alloc(struct fellow_busy *fbo, size_t size, int8_t cram)
 {
 	struct buddy_off_extent *fdr, reg;
-	struct fellow_cache *fc;
 
 	CHECK_OBJ_NOTNULL(fbo, FELLOW_BUSY_MAGIC);
 
-	AN(size);
-
-	fc = fbo->fc;
-	CHECK_OBJ_NOTNULL(fc, FELLOW_CACHE_MAGIC);
-
-	if (cram)
-		FC_INJ_SZLIM(size);
-
-	reg = FC_INJ ? buddy_off_extent_nil :
-	    buddy_alloc1_off_extent_wait(fellow_dskbuddy(fc->ffd),
-	    FEP_SPC, size, cram);
+	reg = fellow_region_alloc(fbo->fc, size, cram);
 
 	if (reg.off < 0) {
 		return (NULL);