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Commit 0668216e authored by Sage Weil's avatar Sage Weil
Browse files

crush: use a temporary variable to simplify crush_do_rule 



Use a temporary variable here to avoid repeated array lookups and clean up
the code a bit.

This reflects ceph.git commit 6b5be27634ad307b471a5bf0db85c4f5c834885f.

Reviewed-by: default avatarAlex Elder <elder@inktank.com>
Signed-off-by: default avatarSage Weil <sage@inktank.com>
parent a1f4895b

net/ceph/crush/mapper.c

+11 −9
Original line number Diff line number Diff line
@@ -519,14 +519,15 @@ int crush_do_rule(const struct crush_map *map, 
	}



	for (step = 0; step < rule->len; step++) {

		struct crush_rule_step *curstep = &rule->steps[step];



		firstn = 0;

		switch (rule->steps[step].op) {

		switch (curstep->op) {

		case CRUSH_RULE_TAKE:

			w[0] = rule->steps[step].arg1;

			w[0] = curstep->arg1;



			/* find position in force_context/hierarchy */

			while (force_pos >= 0 &&

			       force_context[force_pos] != w[0])

			while (force_pos >= 0 && force_context[force_pos] != w[0])

				force_pos--;

			/* and move past it */

			if (force_pos >= 0)
@@ -538,15 +539,16 @@ int crush_do_rule(const struct crush_map *map, 
		case CRUSH_RULE_CHOOSE_LEAF_FIRSTN:

		case CRUSH_RULE_CHOOSE_FIRSTN:

			firstn = 1;

			/* fall through */

		case CRUSH_RULE_CHOOSE_LEAF_INDEP:

		case CRUSH_RULE_CHOOSE_INDEP:

			if (wsize == 0)

				break;



			recurse_to_leaf =

				rule->steps[step].op ==

				curstep->op ==

				 CRUSH_RULE_CHOOSE_LEAF_FIRSTN ||

				rule->steps[step].op ==

				curstep->op ==

				CRUSH_RULE_CHOOSE_LEAF_INDEP;



			/* reset output */
@@ -558,7 +560,7 @@ int crush_do_rule(const struct crush_map *map, 
				 * basically, numrep <= 0 means relative to

				 * the provided result_max

				 */

				numrep = rule->steps[step].arg1;

				numrep = curstep->arg1;

				if (numrep <= 0) {

					numrep += result_max;

					if (numrep <= 0)
@@ -569,7 +571,7 @@ int crush_do_rule(const struct crush_map *map, 
					/* skip any intermediate types */

					while (force_pos &&

					       force_context[force_pos] < 0 &&

					       rule->steps[step].arg2 !=

					       curstep->arg2 !=

					       map->buckets[-1 -

					       force_context[force_pos]]->type)

						force_pos--;
@@ -583,7 +585,7 @@ int crush_do_rule(const struct crush_map *map, 
						      map->buckets[-1-w[i]],

						      weight,

						      x, numrep,

						      rule->steps[step].arg2,

						      curstep->arg2,

						      o+osize, j,

						      firstn,

						      recurse_to_leaf, c+osize);