[PATCH v2 33/49] libmultipath: add is_mpath_uuid() helper

[Martin Wilck <martin.wilck@xxxxxxxx>]

Export it, as it will be used by multipathd and libmpathpersist.

Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
---
 libmultipath/devmapper.c          | 13 +++++++++----
 libmultipath/devmapper.h          |  2 ++
 libmultipath/libmultipath.version |  1 +
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
index 9483f02..6f17d32 100644
--- a/libmultipath/devmapper.c
+++ b/libmultipath/devmapper.c
@@ -840,6 +840,11 @@ int dm_get_map(const char *name, unsigned long long *size, char **outparams)
 	}
 }
 
+bool is_mpath_uuid(const char uuid[DM_UUID_LEN])
+{
+	return !strncmp(uuid, UUID_PREFIX, UUID_PREFIX_LEN);
+}
+
 /**
  * dm_get_wwid(): return WWID for a multipath map
  * @returns:
@@ -857,7 +862,7 @@ int dm_get_wwid(const char *name, char *uuid, int uuid_len)
 	if (rc != DMP_OK)
 		return rc;
 
-	if (!strncmp(tmp, UUID_PREFIX, UUID_PREFIX_LEN))
+	if (is_mpath_uuid(tmp))
 		strlcpy(uuid, tmp + UUID_PREFIX_LEN, uuid_len);
 	else
 		return DMP_NO_MATCH;
@@ -982,7 +987,7 @@ int dm_is_mpath(const char *name)
 
 	switch (rc) {
 	case DMP_OK:
-		if (!strncmp(uuid, UUID_PREFIX, UUID_PREFIX_LEN))
+		if (is_mpath_uuid(uuid))
 			return DM_IS_MPATH_YES;
 		/* fallthrough */
 	case DMP_NOT_FOUND:
@@ -1082,7 +1087,7 @@ int _dm_flush_map (const char *mapname, int flags, int retries)
 			  (mapinfo_t) {
 				  .uuid = uuid,
 				  .target = &params }) != DMP_OK
-	    || strncmp(uuid, UUID_PREFIX, UUID_PREFIX_LEN))
+	    || !is_mpath_uuid(uuid))
 		return DM_FLUSH_OK; /* nothing to do */
 
 	/* if the device currently has no partitions, do not
@@ -1325,7 +1330,7 @@ struct multipath *dm_get_multipath(const char *name)
 			  }) != DMP_OK)
 		return NULL;
 
-	if (strncmp(uuid, UUID_PREFIX, UUID_PREFIX_LEN))
+	if (!is_mpath_uuid(uuid))
 		return NULL;
 
 	strlcpy(mpp->wwid, uuid + UUID_PREFIX_LEN, sizeof(mpp->wwid));
diff --git a/libmultipath/devmapper.h b/libmultipath/devmapper.h
index 4c8f345..a10821f 100644
--- a/libmultipath/devmapper.h
+++ b/libmultipath/devmapper.h
@@ -136,6 +136,8 @@ enum {
 	DM_IS_MPATH_YES,
 	DM_IS_MPATH_ERR,
 };
+
+bool is_mpath_uuid(const char uuid[DM_UUID_LEN]);
 int dm_is_mpath(const char *name);
 
 enum {
diff --git a/libmultipath/libmultipath.version b/libmultipath/libmultipath.version
index 7d3ff63..5b8f9e0 100644
--- a/libmultipath/libmultipath.version
+++ b/libmultipath/libmultipath.version
@@ -127,6 +127,7 @@ global:
 	init_foreign;
 	init_prio;
 	io_err_stat_handle_pathfail;
+	is_mpath_uuid;
 	is_path_valid;
 	libmp_dm_task_create;
 	libmp_get_version;
-- 
2.45.2