crush: remove forcefeed functionality

Remove forcefeed functionality from CRUSH.  This is an ugly misfeature that
is mostly useless and unused.  Remove it.

Reflects ceph.git commit ed974b5000f2851207d860a651809af4a1867942.

Reviewed-by: Alex Elder <elder@inktank.com>
Signed-off-by: Sage Weil <sage@inktank.com>
Conflicts:

	net/ceph/crush/mapper.c

diff --git a/include/linux/crush/mapper.h b/include/linux/crush/mapper.h
index 9322ab8..71d79f4 100644 (file)
--- a/include/linux/crush/mapper.h
+++ b/include/linux/crush/mapper.h
@@ -14,7 +14,6 @@ extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, i
 extern int crush_do_rule(const struct crush_map *map,
                         int ruleno,
                         int x, int *result, int result_max,
-                        int forcefeed,    /* -1 for none */
                         const __u32 *weights);
 
 #endif

diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c
index fba9460..11cf352 100644 (file)
--- a/net/ceph/crush/mapper.c
+++ b/net/ceph/crush/mapper.c
@@ -463,15 +463,12 @@ reject:
  * @x: hash input
  * @result: pointer to result vector
  * @result_max: maximum result size
- * @force: force initial replica choice; -1 for none
  */
 int crush_do_rule(const struct crush_map *map,
                  int ruleno, int x, int *result, int result_max,
-                 int force, const __u32 *weight)
+                 const __u32 *weight)
 {
        int result_len;
-       int force_context[CRUSH_MAX_DEPTH];
-       int force_pos = -1;
        int a[CRUSH_MAX_SET];
        int b[CRUSH_MAX_SET];
        int c[CRUSH_MAX_SET];
@@ -497,27 +494,6 @@ int crush_do_rule(const struct crush_map *map,
        w = a;
        o = b;
 
-       /*
-        * determine hierarchical context of force, if any.  note
-        * that this may or may not correspond to the specific types
-        * referenced by the crush rule.  it will also only affect
-        * the first descent (TAKE).
-        */
-       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;
-               }
-       }
-
        for (step = 0; step < rule->len; step++) {
                struct crush_rule_step *curstep = &rule->steps[step];
 
@@ -525,14 +501,6 @@ int crush_do_rule(const struct crush_map *map,
                switch (curstep->op) {
                case CRUSH_RULE_TAKE:
                        w[0] = curstep->arg1;
-
-                       /* find position in force_context/hierarchy */
-                       while (force_pos >= 0 && force_context[force_pos] != w[0])
-                               force_pos--;
-                       /* and move past it */
-                       if (force_pos >= 0)
-                               force_pos--;
-
                        wsize = 1;
                        break;
 
@@ -567,20 +535,6 @@ int crush_do_rule(const struct crush_map *map,
                                                continue;
                                }
                                j = 0;
-                               if (osize == 0 && force_pos >= 0) {
-                                       /* skip any intermediate types */
-                                       while (force_pos &&
-                                              force_context[force_pos] < 0 &&
-                                              curstep->arg2 !=
-                                              map->buckets[-1 -
-                                              force_context[force_pos]]->type)
-                                               force_pos--;
-                                       o[osize] = force_context[force_pos];
-                                       if (recurse_to_leaf)
-                                               c[osize] = force_context[0];
-                                       j++;
-                                       force_pos--;
-                               }
                                osize += crush_choose(map,
                                                      map->buckets[-1-w[i]],
                                                      weight,

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 7d39f3c..9dda36f 100644 (file)
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1069,7 +1069,7 @@ static int *calc_pg_raw(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
        pps += poolid;
        *num = crush_do_rule(osdmap->crush, ruleno, pps, osds,
                             min_t(int, pool->v.size, *num),
-                            -1, osdmap->osd_weight);
+                            osdmap->osd_weight);
        return osds;
 }