Create: add support for RAID0 layouts.

[thirdparty/mdadm.git] / Create.c

diff --git a/Create.c b/Create.c
index 292f92a9ae639ecaa981e273e30a9f3686345460..6f84e5b0de9944dc05ce6c445a454d376d916615 100644 (file)
--- a/Create.c
+++ b/Create.c
@@ -51,6 +51,9 @@ static int default_layout(struct supertype *st, int level, int verbose)
                default: /* no layout */
                        layout = 0;
                        break;
+               case 0:
+                       layout = RAID0_ORIG_LAYOUT;
+                       break;
                case 10:
                        layout = 0x102; /* near=2, far=1 */
                        if (verbose > 0)
@@ -950,6 +953,11 @@ int Create(struct supertype *st, char *mddev,
                                if (rv) {
                                        pr_err("ADD_NEW_DISK for %s failed: %s\n",
                                               dv->devname, strerror(errno));
+                                       if (errno == EINVAL &&
+                                           info.array.level == 0) {
+                                               pr_err("Possibly your kernel doesn't support RAID0 layouts.\n");
+                                               pr_err("Either upgrade, or use --layout=dangerous\n");
+                                       }
                                        goto abort_locked;
                                }
                                break;
@@ -1046,6 +1054,9 @@ int Create(struct supertype *st, char *mddev,
                        if (ioctl(mdfd, RUN_ARRAY, &param)) {
                                pr_err("RUN_ARRAY failed: %s\n",
                                       strerror(errno));
+                               if (errno == 524 /* ENOTSUP */ &&
+                                   info.array.level == 0)
+                                       cont_err("Please use --layout=original or --layout=alternate\n");
                                if (info.array.chunk_size & (info.array.chunk_size-1)) {
                                        cont_err("Problem may be that chunk size is not a power of 2\n");
                                }