[Samba] vfs_shadow_copy2 problem on top level of homes share

Dr. Hansjörg Maurer hansjoerg.maurer at itsd.de
Wed Feb 8 10:42:34 UTC 2023


we have a problem accessing snapshot in a toplevel of the homes share.
Samba Version 4.16.4

In subdirectories of the homes share snapshots could be accessed.
In both cases, the snapshots are shown, but if I try to access a certain 
snapshot in toplevel of the homes share, the folder is empty in explorer
The mountpoint of the filesystem is
Filesystem is xfs on top of lvm_thin and snapshots are generated and 
mounted by snapper
In the configured snapdir directory links are generated, which link to 
the original snapper directory

[root at serv01 ~]# ll /data/home/snapshots/
insgesamt 0
lrwxrwxrwx 1 root root 36  8. Feb 11:05 2023-01-19--0001 -> 
lrwxrwxrwx 1 root root 36  8. Feb 11:05 2023-01-20--0001 -> 
lrwxrwxrwx 1 root root 36  8. Feb 11:05 2023-01-21--0001 -> 
lrwxrwxrwx 1 root root 36  8. Feb 11:05 2023-01-22--0001 -> 
lrwxrwxrwx 1 root root 36  8. Feb 11:05 2023-01-23--0001 -> 

Below the part of smb.conf

     path = /data/home/%U
     read only = no
    follow symlinks = yes
    wide links =yes
    shadow:localtime = yes
    vfs objects = shadow_copy2
    shadow: mountpoint = /data/home
    shadow: snapdir = /data/home/snapshots
    shadow: sort = desc
    shadow: format = %Y-%m-%d--%H%M

accessing for example
\\SMBSERV\maurer\Downloads (‎Gestern, ‎7. ‎Februar ‎2023, ‏‎22:02)

in explorer works fine

\\SMBSERV\maurer (‎Gestern, ‎7. ‎Februar ‎2023, ‏‎22:02)

shows "no files" in explorer
With other shares I can access snapshots on toplevel

in the error case samba logs

[2023/02/06 20:57:31.610035,  5] 
   smbd_dirptr_lanman2_mode_fn: Couldn't stat [.. 
{@GMT-2023.02.06-14.02.00}] (Datei oder Verzeichnis nicht gefunden)
[2023/02/06 20:57:31.623352,  5] 
   change_to_user_impersonate: Skipping user change - already user
[2023/02/06 20:57:31.623430,  5] 
   print_impersonation_info: Impersonated user: uid=(500,500), 
gid=(0,500), cwd=[/data/home/maurer]
[2023/02/06 20:57:31.623501,  5] 
   smbd_do_qfilepathinfo: . {@GMT-2023.02.06-14.02.00} (fnum 2744924678) 
level=1004 max_data=40
[2023/02/06 20:57:31.623551,  5] 
   fget_ea_dos_attribute: Cannot get attribute from EA on file . 
{@GMT-2023.02.06-14.02.00}: Error = Keine Daten verfügbar

   smbd_dirptr_lanman2_mode_fn: Couldn't stat
line does not occur in the working case

Could anyone confirm this problem or am I missing a config option?
I have seen, that vfs_shadow_copy2 has now more option then when I 
created the setup....



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