problems mounting subvolumes using nfs

[niya levi <niyalevi@gmail.com>]

i have a luks encrypted btrfs fileserver and have created this subvolume
structure on the server for my samba shares

samba                    top level
---|home                subvolume
---|---|gen                subvolume
---|---|---|s4user        subvolume
---|profile                subvolume
---|print_driver        subvolume

these are my export configurations

cat /etc/exports
# /etc/exports - exports(5) - directories exported to NFS clients
#
/samba/home      
192.168.1.0/24(rw,no_subtree_check,no_root_squash,sync,sec=none:sys:krb5:krb5i:krb5p,insecure)
/samba/profiles  
192.168.1.0/24(rw,no_subtree_check,no_root_squash,sync,sec=none:sys:krb5:krb5i:krb5p,insecure)
/samba/Printer_drivers  
192.168.1.0/24(rw,no_subtree_check,no_root_squash,sync,sec=none:sys:krb5:krb5i:krb5p,insecure)

cat /etc/fstab
# /etc/fstab: static file system information
#
# encryped samba home partition
/dev/mapper/samba_crypt  /samba     btrfs    defaults        0       0

# mount
/dev/mapper/samba_crypt on /samba type btrfs (rw,relatime,space_cache)

# exportfs
exportfs
/samba/home               192.168.1.0/24
/samba/profiles           192.168.1.0/24
/samba/Printer_drivers    192.168.1.0/24

# btrfs subvolume list /samba
ID 257 gen 266 top level 5 path Printer_drivers
ID 258 gen 292 top level 5 path home
ID 259 gen 291 top level 5 path profiles
ID 261 gen 295 top level 258 path home/.snapshots
ID 262 gen 28 top level 261 path home/.snapshots/1/snapshot
ID 267 gen 262 top level 258 path home/gen
ID 268 gen 293 top level 267 path home/gen/s4user
ID 275 gen 61 top level 261 path home/.snapshots/12/snapshot
ID 278 gen 295 top level 268 path home/gen/s4user/.snapshots
ID 280 gen 72 top level 278 path home/gen/s4user/.snapshots/1/snapshot
ID 321 gen 143 top level 261 path home/.snapshots/36/snapshot
ID 322 gen 144 top level 278 path home/gen/s4user/.snapshots/22/snapshot

on the server using autofs
i can mount /samba/profile and /samba/print_driver
i can also mount /samba/home and enter the gen and gen/s4user subvolumes
i cannot mount /samba/home/gen or /samba/home/gen/s4user
from what i can gather the problem is todo with the subvolume layout of
/samba/home/gen and /samba/home/gen/s4user or the export of /samba/home
or with the automount specification in auto.master or auto.samba_home
any pointers to getting the mounts to work would be appreciated

# uname -a
Linux tardis 4.1.18-1-ARCH #1 SMP Sat Feb 20 17:48:11 MST 2016 armv7l
GNU/Linux

# btrfs --version
btrfs-progs v4.4

# btrfs fi show
Label: 'smbhome'  uuid: 1cec48c5-a2c5-490f-8e9b-63f325721169
        Total devices 1 FS bytes used 1.39MiB
        devid    1 size 149.05GiB used 2.02GiB path /dev/mapper/samba_crypt

# btrfs fi df /samba
Data, single: total=8.00MiB, used=256.00KiB
System, DUP: total=8.00MiB, used=16.00KiB
Metadata, DUP: total=1.00GiB, used=1.12MiB
GlobalReserve, single: total=16.00MiB, used=0.00B

cat auto.master
/samba/home       /etc/autofs/auto.samba_home
/samba/profiles       /etc/autofs/auto_profiles
/-     /etc/autofs/auto.prindrvs
+dir:/etc/autofs/auto.master.d
+auto.master

# cat auto_profiles
* -fstype=nfs,rw,nosuid,hard,sec=sys,vers=3
my.server.my.domain:/samba/profiles/&      

# cat auto.prindrvs
/samba/Printer_drivers -fstype=nfs,rw,nosuid,hard,sec=sys,vers=3
my.server.my.domain:/samba/Printer_drivers      

# cat auto.samba_home
* -fstype=nfs,rw,nosuid,hard,vers=3,sec=sys 
my.server.my.domain:/samba/home/&

# ls -al /samba/home/gen/s4user
ls: cannot access /samba/home/gen/s4user: No such file or directory

# journalctl -f -u autofs
handle_packet: type = 3
handle_packet_missing_indirect: token 53, name gen, request pid 22842
attempting to mount entry /samba/home/gen
lookup_mount: lookup(file): looking up gen
lookup_mount: lookup(file): gen ->
-fstype=nfs,rw,nosuid,hard,vers=3,sec=sys  my.server.my.domain:/samba/home/&
parse_mount: parse(sun): expanded entry:
-fstype=nfs,rw,nosuid,hard,vers=3,sec=sys 
my.server.my.domain:/samba/home/gen
parse_mount: parse(sun): gathered options:
fstype=nfs,rw,nosuid,hard,vers=3,sec=sys
parse_mount: parse(sun): dequote("my.server.my.domain:/samba/home/gen")
-> my.server.my.domain:/samba/home/gen
parse_mount: parse(sun): core of entry:
options=fstype=nfs,rw,nosuid,hard,vers=3,sec=sys,
loc=my.server.my.domain:/samba/home/gen
sun_mount: parse(sun): mounting root /samba/home, mountpoint gen, what
my.server.my.domain:/samba/home/gen, fstype nfs, options
rw,nosuid,hard,vers=3,sec=sys
mount_mount: mount(nfs): root=/samba/home name=gen
what=my.server.my.domain:/samba/home/gen, fstype=nfs,
options=rw,nosuid,hard,vers=3,sec=sys
mount_mount: mount(nfs): nfs options="rw,nosuid,hard,vers=3,sec=sys",
nobind=0, nosymlink=0, ro=0
mount_mount: mount(nfs): calling mkdir_path /samba/home/gen
mount_mount: mount(nfs): calling mount -t nfs -s -o
rw,nosuid,hard,vers=3,sec=sys my.server.my.domain:/samba/home/gen
/samba/home/gen
>> mount.nfs: access denied by server while mounting
my.server.my.domain:/samba/home/gen
mount(nfs): nfs: mount failure my.server.my.domain:/samba/home/gen on
/samba/home/gen
dev_ioctl_send_fail: token = 53
failed to mount /samba/home/gen
st_expire: state 1 path /samba/home
expire_proc: exp_proc = 1960834160 path /samba/home
expire_cleanup: got thid 1960834160 path /samba/home stat 0
expire_cleanup: sigchld: exp 1960834160 finished, switching from 2 to 1
st_ready: st_ready(): state = 2 path /samba/home
st_expire: state 1 path /-
expire_proc: exp_proc = 1960834160 path /-
expire_cleanup: got thid 1960834160 path /- stat 0
expire_cleanup: sigchld: exp 1960834160 finished, switching from 2 to 1
st_ready: st_ready(): state = 2 path /-

Shadrock