Assemble: print error message if mdadm fails assembling with --uuid option

When mdadm tries to assemble one working device and one zeroed-out device,
it failed but print successful message because there is --uuid option.

Following script always reproduce it.

dd if=/dev/zero of=/dev/ram0 oflag=direct
dd if=/dev/zero of=/dev/ram1 oflag=direct
./mdadm -C /dev/md111 -e 1.2 --uuid="12345678:12345678:12345678:12345678" \
    -l1 -n2 /dev/ram0 /dev/ram1
./mdadm -S /dev/md111
dd if=/dev/zero of=/dev/ram1 oflag=direct
./mdadm -A /dev/md111 --uuid="12345678:12345678:12345678:12345678" \
    /dev/ram0 /dev/ram1

Following is message from mdadm.

mdadm: No super block found on /dev/ram1 (Expected magic a92b4efc, got 00000000)
mdadm: no RAID superblock on /dev/ram1
mdadm: /dev/md111 assembled from 1 drive - need all 2 to start it (use --run to insist).

The mdadm say that it assembled but mdadm does not create /dev/md111.
The message is wrong.

After applying this patch, mdadm reports error correctly as following.

mdadm: No super block found on /dev/ram1 (Expected magic a92b4efc, got 00000000)
mdadm: no RAID superblock on /dev/ram1
mdadm: /dev/ram1 has no superblock - assembly aborted

Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

diff --git a/Assemble.c b/Assemble.c
index 6b5a7c8ef7806d4305eef2f986c6457ae8ab8ebf..2ed588498430e89abcee31289063c6c5ca3ba15f 100644 (file)
--- a/Assemble.c
+++ b/Assemble.c
@@ -269,7 +269,7 @@ static int select_devices(struct mddev_dev *devlist,
                        if (auto_assem || !inargv)
                                /* Ignore unrecognised devices during auto-assembly */
                                goto loop;
-                       if (ident->uuid_set || ident->name[0] ||
+                       if (ident->name[0] ||
                            ident->super_minor != UnSet)
                                /* Ignore unrecognised device if looking for
                                 * specific array */