crush: fix mapping calculation when force argument doesn't exist

If the force argument isn't valid, we should continue calculating a
mapping as if it weren't specified.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 13 insertions, 22 deletions

diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c
index 42599e31dcad..3a94eae7abe9 100644
--- a/net/ceph/crush/mapper.c
+++ b/net/ceph/crush/mapper.c
@@ -477,7 +477,6 @@ int crush_do_rule(struct crush_map *map,
         int i, j;
         int numrep;
         int firstn;
-        int rc = -1;
 
         BUG_ON(ruleno >= map->max_rules);
 
@@ -491,23 +490,18 @@ int crush_do_rule(struct crush_map *map,
          * that this may or may not correspond to the specific types
          * referenced by the crush rule.
          */
-        if (force >= 0) {
-                if (force >= map->max_devices ||
-                    map->device_parents[force] == 0) {
-                        /*dprintk("CRUSH: forcefed device dne\n");*/
-                        rc = -1;  /* force fed device dne */
-                        goto out;
-                }
-                if (!is_out(map, weight, force, x)) {
-                        while (1) {
-                                force_context[++force_pos] = force;
-                                if (force >= 0)
-                                        force = map->device_parents[force];
-                                else
-                                        force = map->bucket_parents[-1-force];
-                                if (force == 0)
-                                        break;
-                        }
+        if (force >= 0 &&
+            force < map->max_devices &&
+            map->device_parents[force] != 0 &&
+            !is_out(map, weight, force, x)) {
+                while (1) {
+                        force_context[++force_pos] = force;
+                        if (force >= 0)
+                                force = map->device_parents[force];
+                        else
+                                force = map->bucket_parents[-1-force];
+                        if (force == 0)
+                                break;
                 }
         }
 
@@ -600,10 +594,7 @@ int crush_do_rule(struct crush_map *map,
                         BUG_ON(1);
                 }
         }
-        rc = result_len;
-
-out:
-        return rc;
+        return result_len;
 }