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Commit a17184a9 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
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md: allow an md array to appear with 0 drives if it has external metadata 



Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ca388059

drivers/md/md.c

+4 −3
Original line number Diff line number Diff line
@@ -4647,7 +4647,8 @@ static int md_ioctl(struct inode *inode, struct file *file, 
	 */

	/* 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

	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;