On Wed 2021-03-10 (08:46), Ulli Horlacher wrote: > When I try to access a btrfs filesystem via nfs, I get the error: > > root@tsmsrvi:~# mount tsmsrvj:/data/fex /nfs/tsmsrvj/fex > root@tsmsrvi:~# time find /nfs/tsmsrvj/fex | wc -l > find: File system loop detected; '/nfs/tsmsrvj/fex/spool' is part of the same > file system loop as '/nfs/tsmsrvj/fex'. > 1
> tsmsrvi and tsmsrvj (nfs client and server) both run Ubuntu 20.04 with > btrfs-progs v5.4.1 On Ubuntu 18.04 this setup works without errors: root@mutter:/backup/rsync# grep tandem /etc/exports /backup/rsync/tandem 176.9.135.138(rw,async,no_subtree_check,no_root_squash) root@mutter:/backup/rsync# btrfs subvolume list /backup/rsync | grep tandem ID 257 gen 62652 top level 5 path tandem ID 5898 gen 62284 top level 257 path tandem/.snapshot/2021-03-01_0300.rsync ID 5906 gen 62284 top level 257 path tandem/.snapshot/2021-03-02_0300.rsync ID 5914 gen 62284 top level 257 path tandem/.snapshot/2021-03-03_0300.rsync ID 5924 gen 62284 top level 257 path tandem/.snapshot/2021-03-04_0300.rsync ID 5932 gen 62284 top level 257 path tandem/.snapshot/2021-03-05_0300.rsync ID 5941 gen 62284 top level 257 path tandem/.snapshot/2021-03-06_0300.rsync ID 5950 gen 62284 top level 257 path tandem/.snapshot/2021-03-07_0300.rsync ID 5962 gen 62413 top level 257 path tandem/.snapshot/2021-03-08_0300.rsync ID 5970 gen 62522 top level 257 path tandem/.snapshot/2021-03-09_0300.rsync ID 5978 gen 62626 top level 257 path tandem/.snapshot/2021-03-10_0300.rsync root@mutter:/backup/rsync# btrfs version btrfs-progs v4.15.1 root@tandem:/backup# mount | grep backup mutter:/backup/rsync/tandem on /backup type nfs (ro,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,soft,proto=tcp,timeo=600,retrans=1,sec=sys,mountaddr=176.9.68.251,mountvers=3,mountport=52943,mountproto=tcp,local_lock=none,addr=176.9.68.251) root@tandem:/backup# ls -l .snapshot/ total 0 drwxr-xr-x 1 root root 392 Mar 1 03:00 2021-03-01_0300.rsync drwxr-xr-x 1 root root 392 Mar 2 03:00 2021-03-02_0300.rsync drwxr-xr-x 1 root root 392 Mar 3 03:00 2021-03-03_0300.rsync drwxr-xr-x 1 root root 392 Mar 4 03:00 2021-03-04_0300.rsync drwxr-xr-x 1 root root 392 Mar 5 03:00 2021-03-05_0300.rsync drwxr-xr-x 1 root root 392 Mar 6 03:00 2021-03-06_0300.rsync drwxr-xr-x 1 root root 392 Mar 7 03:00 2021-03-07_0300.rsync drwxr-xr-x 1 root root 392 Mar 8 03:00 2021-03-08_0300.rsync drwxr-xr-x 1 root root 392 Mar 9 03:00 2021-03-09_0300.rsync drwxr-xr-x 1 root root 392 Mar 10 03:00 2021-03-10_0300.rsync So, it is an issue with the newer btrfs version on Ubuntu 20.04? -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlac...@tik.uni-stuttgart.de Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/ REF:<20210310074620.ga2...@tik.uni-stuttgart.de>
