Thanks Hugo, I totally missed the fsid's.  That works perfectly.
Jim

On Mon, Aug 22, 2011 at 5:28 PM, Hugo Mills [off-list ref] wrote:

On Mon, Aug 22, 2011 at 05:07:45PM -0400, Jim Maloney wrote:

quoted

I have been experimenting exporting btrfs subvolumes over nfs. =C2=A0=

Main

quoted

subvolume is filesys1 mounted at /filesys1. =C2=A0Below this is subv=

olume

quoted

base, user1 is in base and documents is in user1. =C2=A0 documents i=

s

quoted

mounted at /documents. =C2=A0/etc/exports is:
/filesys1/base/user1 =C2=A0 =C2=A0172.16.0.0/24(rw,no_acl,no_root_sq=

uash,fsid=3D0)

quoted

/filesys1/user1-snapshot =C2=A0 =C2=A0 =C2=A0 =C2=A0172.16.0.0/24(rw=

,no_acl,no_root_squash,fsid=3D0)

quoted

/documents =C2=A0 =C2=A0 =C2=A0172.16.0.0/24(rw,no_acl,no_root_squas=

h,fsid=3D0)

=C2=A0 I think you need to specify a different fsid for each export.
That's what I've got here, and it seems to work.

=C2=A0 Hugo.

quoted

On the client machine I mount user1 as /mnt/user and all data from
user is present.
I can also umount /mnt/usr and mount /documents as /mnt/documents an=

d

quoted

all data is present.
However, if I mount user1 as /mnt/user and then mount /documents as
/mnt/documents
the data from the last subvolume mounted shows in both mounts. =C2=A0=

Mount

quoted

also shows:
172.16.0.28:/documents/ on /mnt/user type nfs
(rw,relatime,vers=3D3,rsize=3D262144,wsize=3D262144,namlen=3D255,har=

d,proto=3Dtcp,timeo=3D600,retrans=3D2,sec=3Dsys,mountaddr=3D172.16.0.28=
,mountvers=3D3,mountport=3D892,mountproto=3Dudp,local_lock=3Dnone,addr=3D=
172.16.0.28)

quoted

172.16.0.28:/documents/ on /mnt/documents type nfs
(rw,relatime,vers=3D3,rsize=3D262144,wsize=3D262144,namlen=3D255,har=

d,proto=3Dtcp,timeo=3D600,retrans=3D2,sec=3Dsys,mountaddr=3D172.16.0.28=
,mountvers=3D3,mountport=3D892,mountproto=3Dudp,local_lock=3Dnone,addr=3D=
172.16.0.28)

quoted

The initial mount of user1 on /mnt/user showed correctly in mount.
Mount changes when I add the mount for /documents.
I don't know how to troubleshoot this. =C2=A0I am happy to provide a=

ny info

quoted

which can help.
Btrfs is currently on a centOS6 machine running kernel 3.0.1 with
btrfs-progs from git unstable.
NFS is v3 on both server and client and the client is Fedora 15 kern=

el

quoted

2.6.40-4.fc15.x86_64
Thanks
Jim Maloney

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=3D=3D=3D Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.=

org.uk =3D=3D=3D

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un Well ---

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Jim Maloney

email - jim@webstarts.com
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