[Bug 1735953] Re: samba mount fails to write

[Andreas Hasenack]

When you use the uid/gid options, do all files in the share get owned by
that uid/gid?

Can you check the output of the mount command after mounting the share,
with and without uid/gid, and see which options ended up being used?
That output will include defaults that you did not specify.

For example, here when I mount from a ds216 synology NAS using these options in fstab "username=andreas,vers=3.0,noauto" I get this in the output of mount:
rw,nosuid,nodev,relatime,vers=3.0,cache=strict,username=andreas,domain=,uid=1000,forceuid,gid=1000,forcegid,addr=<ip>,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1,user=andreas

uid and gid were added automatically in my case. My fstab line is:
//server/downloads /ds216/downloads cifs user,username=andreas,vers=3.0,noauto

This is on artful. cifs-utils 2:6.7-1

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https://bugs.launchpad.net/bugs/1735953

Title:
  samba mount fails to write

Status in samba:
  Unknown
Status in samba package in Ubuntu:
  New

Bug description:
  Ubuntu 17.10 appears to aggressively trigger Samba bug 10541 (
  https://bugzilla.samba.org/show_bug.cgi?id=10541 ). Previous versions
  of Ubuntu worked fine, but 17.10 appears to request quota information
  on every write, resulting in a complete inability to write to files.

  Remote Samba share is mounted as cifs as read-write, and has been
  working for years and many software releases. Unable to write/create
  files from bash, from GUI file browser, or even from a Windows VM with
  access to the mounted location. I haven't seen any scenario where
  Ubuntu 17.10 can write to the share.

  Server is running Samba 4.7.3 with a long-running good configuration.

  Every write request from my Ubuntu desktop results in the following
  server log:

  [2017/12/02 16:44:25.306674,  0] ../source3/lib/sysquotas.c:461(sys_get_quota)
    sys_path_to_bdev() failed for path [.]!

  There are no other log entries.

  The root bug appears to be in Samba, but recent changes to Ubuntu have
  triggered the bug in a way that breaks write functionality.

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