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Date: Fri, 8 Jun 2012 06:42:10 +0200
From: Lennert Buytenhek <buytenh@wantstofly.org>
To: linux-btrfs@vger.kernel.org
Subject: problem re-adding original mount block device on multi-device fs
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(please CC on replies, I'm not subscribed to the list)

Hi!

This fails:

	# mkfs.btrfs /dev/sd[bcde]
	# mount /dev/sdb /mnt/x
	# btrfs device delete /dev/sdb /mnt/x
	# btrfs device add /dev/sdb /mnt/x
	/dev/sdb is mounted
	#

It seems that I have to unmount and remount the fs using another
constituent block device before I can re-add the original block
device that the filesystem was mounted with:

	# umount /mnt/x
	# mount /dev/sdb /mnt/x
	mount: wrong fs type, bad option, bad superblock on /dev/sdb,
	       missing codepage or helper program, or other error
	       In some cases useful info is found in syslog - try
	       dmesg | tail or so
	# mount /dev/sdc /mnt/x
	# btrfs device add /dev/sdb /mnt/x
	#

This is on up-to-date F17, kernel 3.4.0(-1.fc17) with btrfs-progs
0.19(-18.fc17).


thanks,
Lennert