problem re-adding original mount block device on multi-device fs

problem re-adding original mount block device on multi-device fs

[Lennert Buytenhek]

(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

Re: problem re-adding original mount block device on multi-device fs

[Goffredo Baroncelli]

On 06/08/2012 06:42 AM, Lennert Buytenhek wrote:
> (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).

Give a look to this patche:

[PATCH 2/2] Btrfs: fix wrong the mount information in /proc

This should address (even without solving) this kind of problem.


> 
> 
> thanks,
> Lennert
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