more ddf stuff
[thirdparty/mdadm.git] / Create.c
index 1099dcb..15a5bfd 100644 (file)
--- a/Create.c
+++ b/Create.c
@@ -70,6 +70,7 @@ int Create(struct supertype *st, char *mddev, int mdfd,
        int vers;
        int rv;
        int bitmap_fd;
+       int have_container = 0;
        unsigned long long bitmapsize;
        struct mdinfo *sra;
        struct mdinfo info;
@@ -125,11 +126,47 @@ int Create(struct supertype *st, char *mddev, int mdfd,
                        Name ": This level does not support spare devices\n");
                return 1;
        }
+
+       if (subdevs == 1 && strcmp(devlist->devname, "missing") != 0) {
+               /* If given a single device, it might be a container, and we can
+                * extract a device list from there
+                */
+               mdu_array_info_t inf;
+               int fd;
+
+               memset(&inf, 0, sizeof(inf));
+               fd = open(devlist->devname, O_RDONLY, 0);
+               if (fd >= 0 &&
+                   ioctl(fd, GET_ARRAY_INFO, &inf) == 0 &&
+                   inf.raid_disks == 0) {
+                       /* yep, looks like a container */
+                       if (st) {
+                               rv = st->ss->load_super(st, fd,
+                                                       devlist->devname);
+                               if (rv == 0)
+                                       have_container = 1;
+                       } else {
+                               st = guess_super(fd);
+                               if (st && !(rv = st->ss->
+                                           load_super(st, fd,
+                                                      devlist->devname)))
+                                       have_container = 1;
+                               else
+                                       st = NULL;
+                       }
+               }
+               if (fd >= 0)
+                       close(fd);
+               if (have_container) {
+                       subdevs = 0;
+                       devlist = NULL;
+               }
+       }
        if (subdevs > raiddisks+sparedisks) {
                fprintf(stderr, Name ": You have listed more devices (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
                return 1;
        }
-       if (subdevs < raiddisks+sparedisks) {
+       if (!have_container && subdevs < raiddisks+sparedisks) {
                fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
                return 1;
        }
@@ -311,11 +348,13 @@ int Create(struct supertype *st, char *mddev, int mdfd,
                return 1;
        }
        if (size == 0) {
-               if (mindisc == NULL) {
+               if (mindisc == NULL && !have_container) {
                        fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
                        return 1;
                }
-               if (level > 0 || level == LEVEL_MULTIPATH || level == LEVEL_FAULTY) {
+               if (level > 0 || level == LEVEL_MULTIPATH
+                   || level == LEVEL_FAULTY
+                   || (st && st->ss->external) ) {
                        /* size is meaningful */
                        if (minsize > 0x100000000ULL && st->ss->major == 0) {
                                fprintf(stderr, Name ": devices too large for RAID level %d\n", level);
@@ -375,7 +414,7 @@ int Create(struct supertype *st, char *mddev, int mdfd,
                missing_disks++;
        }
 
-       if (level <= 0 && first_missing != subdevs * 2) {
+       if (level <= 0 && first_missing < subdevs * 2) {
                fprintf(stderr,
                        Name ": This level does not support missing devices\n");
                return 1;
@@ -571,7 +610,11 @@ int Create(struct supertype *st, char *mddev, int mdfd,
                            strcasecmp(dv->devname, "missing")==0)
                                continue;
 
-                       fd = open(dv->devname, O_RDWR|O_EXCL, 0);
+                       if (st->ss->external == 2)
+                               fd = open(dv->devname, O_RDWR, 0);
+                       else
+                               fd = open(dv->devname, O_RDWR|O_EXCL,0);
+
                        if (fd < 0) {
                                fprintf(stderr, Name ": failed to open %s "
                                        "after earlier success - aborting\n",