core: unit_name_from_path() does not return -ENAMETOOLONG anymore

Follow-ups for a7fb1f2eae and
1d0727e76f.

src/core/mount.c

@@ -1717,37 +1717,14 @@ static int mount_setup_unit(
         if (!is_path(where))
                 return 0;
 
-        /* Mount unit names have to be (like all other unit names) short enough to fit into file names. This
-         * means there's a good chance that overly long mount point paths after mangling them to look like a
-         * unit name would result in unit names we don't actually consider valid. This should be OK however
-         * as such long mount point paths should not happen on regular systems — and if they appear
-         * nonetheless they are generally synthesized by software, and thus managed by that other
-         * software. Having such long names just means you cannot use systemd to manage those specific mount
-         * points, which should be an OK restriction to make. After all we don't have to be able to manage
-         * all mount points in the world — as long as we don't choke on them when we encounter them. */
         r = unit_name_from_path(where, ".mount", &e);
-        if (r < 0) {
-                static RateLimit rate_limit = { /* Let's log about this at warning level at most once every
-                                                 * 5s. Given that we generate this whenever we read the file
-                                                 * otherwise we probably shouldn't flood the logs with
-                                                 * this */
-                        .interval = 5 * USEC_PER_SEC,
-                        .burst = 1,
-                };
-
-                if (r == -ENAMETOOLONG)
-                        return log_struct_errno(
-                                        ratelimit_below(&rate_limit) ? LOG_WARNING : LOG_DEBUG, r,
-                                        "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR,
-                                        "MOUNT_POINT=%s", where,
-                                        LOG_MESSAGE("Mount point path '%s' too long to fit into unit name, ignoring mount point.", where));
-
+        if (r < 0)
                 return log_struct_errno(
-                                ratelimit_below(&rate_limit) ? LOG_WARNING : LOG_DEBUG, r,
+                                LOG_WARNING, r,
                                 "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR,
                                 "MOUNT_POINT=%s", where,
-                                LOG_MESSAGE("Failed to generate valid unit name from mount point path '%s', ignoring mount point: %m", where));
-        }
+                                LOG_MESSAGE("Failed to generate valid unit name from mount point path '%s', ignoring mount point: %m",
+                                            where));
 
         u = manager_get_unit(m, e);
         if (u)

src/core/swap.c

@@ -1437,8 +1437,7 @@ int swap_process_device_new(Manager *m, sd_device *dev) {
                 int q;
 
                 q = unit_name_from_path(devlink, ".swap", &n);
-                if (IN_SET(q, -EINVAL, -ENAMETOOLONG)) /* If name too long or otherwise not convertible to
-                                                        * unit name, we can't manage it */
+                if (q == -EINVAL) /* If the name is not convertible to unit name, we can't manage it */
                         continue;
                 if (q < 0)
                         return q;

src/core/unit.c

@@ -1519,7 +1519,7 @@ static int unit_add_mount_dependencies(Unit *u) {
                         Unit *m;
 
                         r = unit_name_from_path(prefix, ".mount", &p);
-                        if (IN_SET(r, -EINVAL, -ENAMETOOLONG))
+                        if (r == -EINVAL)
                                 continue; /* If the path cannot be converted to a mount unit name, then it's
                                            * not manageable as a unit by systemd, and hence we don't need a
                                            * dependency on it. Let's thus silently ignore the issue. */