On Mon 2021-07-12 (23:56), g.btrfs@cobb.uk.net wrote:

quoted

root@tsmsrvj:/etc# du -Hs /nfs/localhost/snapshots
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/snapshots/spool

Sure. But it makes the useful operations work. du, find, ls -R, etc all
work properly on /nfs/localhost/fex.

Properly on /nfs/localhost/fex : yes
Properly on /nfs/localhost/snapshots : NO

And the error messages are annoying!

root@tsmsrvj:/etc# exportfs -v
/data/fex       localhost.localdomain(rw,async,wdelay,crossmnt,no_root_squash,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)
/data/snapshots localhost.localdomain(rw,async,wdelay,crossmnt,no_root_squash,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)

root@tsmsrvj:/etc# mount -o vers=3 localhost:/data/fex /nfs/localhost/fex
root@tsmsrvj:/etc# mount -o vers=3 localhost:/data/snapshots /nfs/localhost/snapshots
root@tsmsrvj:/etc# mount | grep localhost
localhost:/data/fex on /nfs/localhost/fex type nfs (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=127.0.0.1,mountvers=3,mountport=37961,mountproto=udp,local_lock=none,addr=127.0.0.1)
localhost:/data/snapshots on /nfs/localhost/snapshots type nfs (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=127.0.0.1,mountvers=3,mountport=37961,mountproto=udp,local_lock=none,addr=127.0.0.1)

root@tsmsrvj:/etc# ls -la /data/snapshots /nfs/localhost/snapshots
/data/snapshots:
total 16
drwxr-xr-x 1 root root     20 Jul 13 09:19 .
drwxr-xr-x 1 root root     24 Jul 12 17:42 ..
drwxr-xr-x 1 fex  fex  261964 Mar  7 14:53 fex_1
drwxr-xr-x 1 fex  fex  261964 Mar  7 14:53 fex_2

/nfs/localhost/snapshots:
total 4
drwxr-xr-x 1 root root     20 Jul 13 09:19 .
drwxr-xr-x 4 root root   4096 Jul 12 17:49 ..
drwxr-xr-x 1 fex  fex  261964 Mar  7 14:53 fex_1
drwxr-xr-x 1 fex  fex  261964 Mar  7 14:53 fex_2

root@tsmsrvj:/etc# du -Hs /nfs/localhost/snapshots
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/snapshots/fex_1/XXXXXXXXXX@gmail.com

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/snapshots/fex_2/XXXXXXXXXX@gmail.com

25708064        /nfs/localhost/snapshots

root@tsmsrvj:/etc# du -Hs /data/snapshots
25712896        /data/snapshots

root@tsmsrvj:/etc# ls -R /nfs/localhost/snapshots | wc -l
ls: /nfs/localhost/snapshots/fex_1/XXXXXXXXXX@gmail.com: not listing already-listed directory
ls: /nfs/localhost/snapshots/fex_2/XXXXXXXXXX@gmail.com: not listing already-listed directory
128977

root@tsmsrvj:/etc# ls -R /data/snapshots | wc -l
129021

root@tsmsrvj:/etc# ls -aR /nfs/localhost/snapshots | wc -l
ls: /nfs/localhost/snapshots/fex_1/XXXXXXXXXX@gmail.com: not listing already-listed directory
ls: /nfs/localhost/snapshots/fex_2/XXXXXXXXXX@gmail.com: not listing already-listed directory
281357

root@tsmsrvj:/etc# ls -aR /data/snapshots | wc -l
281427



More debug info:

root@tsmsrvj:/data/snapshots# find . >/tmp/local.list

root@tsmsrvj:/nfs/localhost/snapshots# find . >/tmp/nfs.list
find: File system loop detected; './fex_1/XXXXXXXXXX@gmail.com' is part of the same file system loop as '.'.
find: File system loop detected; './fex_2/XXXXXXXXXX@gmail.com' is part of the same file system loop as '.'.

root@tsmsrvj:/nfs/localhost/snapshots# diff -u /tmp/local.list /tmp/nfs.list

--- /tmp/local.list	2021-07-13 09:25:36.388084331 +0200
+++ /tmp/nfs.list	2021-07-13 09:26:02.120793230 +0200

@@ -1,25 +1,5 @@
 .
 ./fex_1
-./fex_1/XXXXXXXXXX@gmail.com
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/alist
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/filename
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/size
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/autodelete
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/keep
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/ip
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/uurl
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/useragent
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/header
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/dkey
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/speed
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/md5sum
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/download
-./fex_1/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/error
-./fex_1/XXXXXXXXXX@gmail.com/.log
-./fex_1/XXXXXXXXXX@gmail.com/.log/fup
-./fex_1/XXXXXXXXXX@gmail.com/.log/fop
 ./fex_1/XXXXXXXXXX@web.de
 ./fex_1/XXXXXXXXXX@web.de/@LOCALE
 ./fex_1/XXXXXXXXXX@web.de/.log

@@ -97976,26 +97956,6 @@
 ./fex_1/.xkeys
 ./fex_1/.snapshot
 ./fex_2
-./fex_2/XXXXXXXXXX@gmail.com
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/alist
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/filename
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/size
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/autodelete
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/keep
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/ip
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/uurl
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/useragent
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/header
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/dkey
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/speed
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/md5sum
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/download
-./fex_2/XXXXXXXXXX@gmail.com/XXXXXXXXXX@pi2.uni-stuttgart.de/origin-8.5.1-SR2.zip/error
-./fex_2/XXXXXXXXXX@gmail.com/.log
-./fex_2/XXXXXXXXXX@gmail.com/.log/fup
-./fex_2/XXXXXXXXXX@gmail.com/.log/fop
 ./fex_2/XXXXXXXXXX@web.de
 ./fex_2/XXXXXXXXXX@web.de/@LOCALE
 ./fex_2/XXXXXXXXXX@web.de/.log

-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK         
Universitaet Stuttgart         E-Mail: horlacher@tik.uni-stuttgart.de
Allmandring 30a                Tel:    ++49-711-68565868
70569 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/
REF:<8506b846-4c4d-6e8f-09ee-e0f2736aac4e@cobb.uk.net>