[dm-devel] [PATCH v2 07/14] libmultipath: consolidate group_by_* functions
Benjamin Marzinski
bmarzins at redhat.com
Fri Aug 23 17:48:51 UTC 2019
group_by_node_name() and group_by_serial() are exactly the same except
for how the paths are compared. group_by_prio() is different but its
pathvec solves the same issue as the bitmap from the other two
functions, and since we are always running sort_pathgroups() after
calling pgpriorityfn, there is no need to sort the pathgroups in
group_by_prio(). This means that all three functions can be replaced
with one function, group_by_match() that takes a match function as an
argument.
Reviewed-by: Martin Wilck <mwilck at suse.com>
Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
---
libmultipath/pgpolicies.c | 189 +++++++++-----------------------------
1 file changed, 41 insertions(+), 148 deletions(-)
diff --git a/libmultipath/pgpolicies.c b/libmultipath/pgpolicies.c
index 1af42f52..2e4db74c 100644
--- a/libmultipath/pgpolicies.c
+++ b/libmultipath/pgpolicies.c
@@ -4,6 +4,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <stdbool.h>
#include "checkers.h"
#include "util.h"
@@ -104,10 +105,29 @@ int group_paths(struct multipath *mp)
return 0;
}
-/*
- * One path group per unique tgt_node_name present in the path vector
- */
-int group_by_node_name(struct multipath * mp)
+typedef bool (path_match_fn)(struct path *pp1, struct path *pp2);
+
+bool
+node_names_match(struct path *pp1, struct path *pp2)
+{
+ return (strncmp(pp1->tgt_node_name, pp2->tgt_node_name,
+ NODE_NAME_SIZE) == 0);
+}
+
+bool
+serials_match(struct path *pp1, struct path *pp2)
+{
+ return (strncmp(pp1->serial, pp2->serial, SERIAL_SIZE) == 0);
+}
+
+bool
+prios_match(struct path *pp1, struct path *pp2)
+{
+ return (pp1->priority == pp2->priority);
+}
+
+int group_by_match(struct multipath * mp,
+ bool (*path_match_fn)(struct path *, struct path *))
{
int i, j;
int * bitmap;
@@ -150,8 +170,7 @@ int group_by_node_name(struct multipath * mp)
pp2 = VECTOR_SLOT(mp->paths, j);
- if (!strncmp(pp->tgt_node_name, pp2->tgt_node_name,
- NODE_NAME_SIZE)) {
+ if (path_match_fn(pp, pp2)) {
if (store_path(pgp->paths, pp2))
goto out1;
@@ -171,70 +190,28 @@ out:
return 1;
}
+/*
+ * One path group per unique tgt_node_name present in the path vector
+ */
+int group_by_node_name(struct multipath * mp)
+{
+ return group_by_match(mp, node_names_match);
+}
+
/*
* One path group per unique serial number present in the path vector
*/
int group_by_serial(struct multipath * mp)
{
- int i, j;
- int * bitmap;
- struct path * pp;
- struct pathgroup * pgp;
- struct path * pp2;
-
- /* init the bitmap */
- bitmap = (int *)MALLOC(VECTOR_SIZE(mp->paths) * sizeof (int));
-
- if (!bitmap)
- goto out;
-
- for (i = 0; i < VECTOR_SIZE(mp->paths); i++) {
-
- if (bitmap[i])
- continue;
-
- pp = VECTOR_SLOT(mp->paths, i);
-
- /* here, we really got a new pg */
- pgp = alloc_pathgroup();
-
- if (!pgp)
- goto out1;
-
- if (add_pathgroup(mp, pgp))
- goto out2;
-
- /* feed the first path */
- if (store_path(pgp->paths, pp))
- goto out1;
-
- bitmap[i] = 1;
-
- for (j = i + 1; j < VECTOR_SIZE(mp->paths); j++) {
-
- if (bitmap[j])
- continue;
-
- pp2 = VECTOR_SLOT(mp->paths, j);
-
- if (0 == strcmp(pp->serial, pp2->serial)) {
- if (store_path(pgp->paths, pp2))
- goto out1;
+ return group_by_match(mp, serials_match);
+}
- bitmap[j] = 1;
- }
- }
- }
- FREE(bitmap);
- return 0;
-out2:
- free_pathgroup(pgp, KEEP_PATHS);
-out1:
- FREE(bitmap);
-out:
- free_pgvec(mp->pg, KEEP_PATHS);
- mp->pg = NULL;
- return 1;
+/*
+ * One path group per priority present in the path vector
+ */
+int group_by_prio(struct multipath *mp)
+{
+ return group_by_match(mp, prios_match);
}
int one_path_per_group(struct multipath *mp)
@@ -293,87 +270,3 @@ out:
mp->pg = NULL;
return 1;
}
-
-int group_by_prio(struct multipath *mp)
-{
- int i;
- int prio;
- struct path * pp;
- struct pathgroup * pgp;
- vector pathvec = NULL;
-
- pathvec = vector_alloc();
- if (!pathvec)
- goto out;
-
- vector_foreach_slot(mp->paths, pp, i) {
- if (!vector_alloc_slot(pathvec))
- goto out1;
- vector_set_slot(pathvec, pp);
- }
-
- while (VECTOR_SIZE(pathvec) > 0) {
- pp = VECTOR_SLOT(pathvec, 0);
- prio = pp->priority;
-
- /*
- * Find the position to insert the new path group. All groups
- * are ordered by the priority value (higher value first).
- */
- vector_foreach_slot(mp->pg, pgp, i) {
- pp = VECTOR_SLOT(pgp->paths, 0);
-
- if (prio > pp->priority)
- break;
- }
-
- /*
- * Initialize the new path group.
- */
- pgp = alloc_pathgroup();
-
- if (!pgp)
- goto out1;
-
- if (store_path(pgp->paths, VECTOR_SLOT(pathvec, 0)))
- goto out2;
-
- vector_del_slot(pathvec, 0);
-
- /*
- * Store the new path group into the vector.
- */
- if (i < VECTOR_SIZE(mp->pg)) {
- if (!vector_insert_slot(mp->pg, i, pgp))
- goto out2;
- pgp->mpp = mp;
- } else {
- if (add_pathgroup(mp, pgp))
- goto out2;
- }
-
- /*
- * add the other paths with the same prio
- */
- vector_foreach_slot(pathvec, pp, i) {
- if (pp->priority == prio) {
- if (store_path(pgp->paths, pp))
- goto out1;
-
- vector_del_slot(pathvec, i);
- i--;
- }
- }
- }
- free_pathvec(pathvec, KEEP_PATHS);
- return 0;
-out2:
- free_pathgroup(pgp, KEEP_PATHS);
-out1:
- free_pathvec(pathvec, KEEP_PATHS);
-out:
- free_pgvec(mp->pg, KEEP_PATHS);
- mp->pg = NULL;
- return 1;
-
-}
--
2.17.2
More information about the dm-devel
mailing list