Add a linux and freebsd compat function for opening the kstat

cmd/zpool/zpool_main.c

@@ -3465,7 +3465,7 @@ typedef struct import_progress_args {
 static void *
 report_import_progress_thread(void *arg)
 {
-	char path[] = "/proc/spl/kstat/zfs/import_progress";
+	char kstat_path[] = "import_progress";
 	import_progress_args_t *pa = arg;
 	struct timespec start = {0};
 	struct timespec last_report = {0};
@@ -3475,7 +3475,7 @@ report_import_progress_thread(void *arg)
 	int rc = 0;
 	int import_kstat;
 
-	import_kstat = open(path, O_RDONLY);
+	import_kstat = open_kstat(kstat_path);
 	if (import_kstat < 0)
 		rc = -1;
 
@@ -3581,9 +3581,9 @@ report_import_progress_thread(void *arg)
 	}
 
 	if (rc < 0) {
-		fprintf(stderr, "%s is not available to monitor the "
+		fprintf(stderr, "kstat %s is not available to monitor the "
 		    "progress of the import.  The import is "
-		    "continuing.\n", path);
+		    "continuing.\n", kstat_path);
 	}
 
 	if (import_kstat > 0)

include/libzutil.h

@@ -172,6 +172,7 @@ int for_each_vdev_cb(void *zhp, nvlist_t *nv, pool_vdev_iter_f func,
 int for_each_vdev_in_nvlist(nvlist_t *nvroot, pool_vdev_iter_f func,
     void *data);
 void update_vdevs_config_dev_sysfs_path(nvlist_t *config);
+int open_kstat(char *path_suffix);
 #ifdef	__cplusplus
 }
 #endif

lib/libzutil/os/freebsd/zutil_import_os.c

@@ -252,3 +252,20 @@ void
 update_vdevs_config_dev_sysfs_path(nvlist_t *config)
 {
 }
+
+/*
+ * Open a kstat and return the filehandle or error.
+ */
+int
+open_kstat(char *path_suffix)
+{
+	char kstat_prefix[] = "/dev/kstat/zfs/";
+	char path[MAXPATHLEN];
+
+	if (strlcpy(path, kstat_prefix, sizeof (path)) >= sizeof (path))
+		return (-ENAMETOOLONG);
+	if (strlcat(path, path_suffix, sizeof (path)) >= sizeof (path))
+		return (-ENAMETOOLONG);
+
+	return (open(path, O_RDONLY));
+}

lib/libzutil/os/linux/zutil_import_os.c

@@ -810,6 +810,23 @@ update_vdevs_config_dev_sysfs_path(nvlist_t *config)
 	for_each_vdev_in_nvlist(nvroot, sysfs_path_pool_vdev_iter_f, NULL);
 }
 
+/*
+ * Open a kstat and return the filehandle or error.
+ */
+int
+open_kstat(char *path_suffix)
+{
+	char kstat_prefix[] = "/proc/spl/kstat/zfs/";
+	char path[MAXPATHLEN];
+
+	if (strlcpy(path, kstat_prefix, sizeof (path)) >= sizeof (path))
+		return (-ENAMETOOLONG);
+	if (strlcat(path, path_suffix, sizeof (path)) >= sizeof (path))
+		return (-ENAMETOOLONG);
+
+	return (open(path, O_RDONLY));
+}
+
 /*
  * Update a leaf vdev's persistent device strings
  *