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'.
It is even worse: root@tsmsrvj:# grep localhost /etc/exports /data/fex localhost(rw,async,no_subtree_check,no_root_squash) root@tsmsrvj:# mount localhost:/data/fex /nfs/localhost/fex root@tsmsrvj:# du -s /data/fex 64282240 /data/fex root@tsmsrvj:# du -s /nfs/localhost/fex du: WARNING: Circular directory structure. This almost certainly means that you have a corrupted file system. NOTIFY YOUR SYSTEM MANAGER. The following directory is part of the cycle: /nfs/localhost/fex/spool 0 /nfs/localhost/fex root@tsmsrvj:# btrfs subvolume list /data ID 257 gen 42 top level 5 path fex ID 270 gen 42 top level 257 path fex/spool ID 271 gen 21 top level 270 path fex/spool/.snapshot/2021-03-07_1453.test ID 272 gen 23 top level 270 path fex/spool/.snapshot/2021-03-07_1531.test ID 273 gen 25 top level 270 path fex/spool/.snapshot/2021-03-07_1532.test ID 274 gen 27 top level 270 path fex/spool/.snapshot/2021-03-07_1718.test root@tsmsrvj:# uname -a Linux tsmsrvj 5.4.0-66-generic #74-Ubuntu SMP Wed Jan 27 22:54:38 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux root@tsmsrvj:# btrfs version btrfs-progs v5.4.1 root@tsmsrvj:# dpkg -l | grep nfs- ii nfs-common 1:1.3.4-2.5ubuntu3.3 amd64 NFS support files common to client and server ii nfs-kernel-server 1:1.3.4-2.5ubuntu3.3 amd64 support for NFS kernel server The same bug appears if nfs server and client are different hosts or the client is an older Ubuntu 18.04 system. -- 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>
