[PATCH 006 of 7] md: Allow an md array to appear with 0 drives if it has external metadata.

[NeilBrown]

Signed-off-by: Neil Brown <[EMAIL PROTECTED]>

### Diffstat output
 ./drivers/md/md.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c       2007-12-14 16:09:03.000000000 +1100
+++ ./drivers/md/md.c   2007-12-14 16:09:09.000000000 +1100
@@ -4650,9 +4650,10 @@ static int md_ioctl(struct inode *inode,
         */
        /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
         * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
-       if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
-                       && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
-                       && cmd != GET_BITMAP_FILE) {
+       if ((!mddev->raid_disks && !mddev->external)
+           && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
+           && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
+           && cmd != GET_BITMAP_FILE) {
                err = -ENODEV;
                goto abort_unlock;
        }
-
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