samba and file locks - solved

[Lukasz]

Hello again,

Sysctl security.bsd.see_other_gids variable caused problems with file
locks. If it's set to 0 the problem appears. If it is set to 1 (default)
everything works as expected.

Regards

Lukasz

On 01/07/2016 04:14 PM, FreeBSD wrote:
> Hello,
> 
> I have a problem with file locks on share. My server is running
> FreeBSD 10.2 (amd64), samba 4.3.3 (ROLE_ACTIVE_DIRECTORY_DC) and ZFS
> pool (raidz) as a windows share.
> There is a strange behavior when I open a file from one windows
> workstation (smbstatus shows DENY_WRITE and everything seems right) and
> after about 5 minutes later I open the same file, which is still edited
> on first computer, from other windows workstation. At this moment I
> should see a warning message which inform that the file is going to be
> opened in read-only mode but nothing happen. The file is opened normally
> in read-write mode, so I can write into this file from both workstations
> at the same time overwriting data! It looks like the file lock doesn't
> work any more.
> 
> log.smbd shows:
> ../source3/smbd/close.c:268(close_remove_share_mode)
> close_remove_share_mode: Could not get share mode lock for file
> data/filename
> 
> I noticed the same situation with share based on UFS.
> 
> Below is my smb4.conf.
> 
> [global]
>         dos charset = CP852
>         unix charset = ISO8859-2
>         workgroup = WORKGROUP
>         realm = somedomain.int
>         server role = active directory domain controller
>         passdb backend = samba_dsdb
>         min receivefile size = 16384
>         kernel change notify = No
>         dns forwarder = 192.168.1.1
>         nsupdate command = /usr/local/bin/samba-nsupdate -g
>         rpc_server:tcpip = no
>         rpc_daemon:spoolssd = embedded
>         rpc_server:spoolss = embedded
>         rpc_server:winreg = embedded
>         rpc_server:ntsvcs = embedded
>         rpc_server:eventlog = embedded
>         rpc_server:srvsvc = embedded
>         rpc_server:svcctl = embedded
>         rpc_server:default = external
>         winbindd:use external pipes = true
>         idmap config nc:range = 10000-20000
>         idmap config nc:backend = ad
>         idmap_ldb:use rfc2307 = yes
>         idmap config * : backend = tdb
>         aio read size = 16384
>         aio write size = 16384
>         aio write behind = true
>         write cache size = 262144
>         map archive = No
>         map readonly = no
>         store dos attributes = Yes
>         vfs objects = dfs_samba4 acl_xattr
> 
> [sysvol]
>         path = /var/db/samba4/sysvol
>         read only = No
>         vfs objects = acl_xattr
> 
> [SHARE1]
>         comment = SHARE1
>         path = /mnt/zfs_share/SHARE1
>         read only = No
>         guest ok = Yes
>         map acl inherit = Yes
>         oplocks = No
>         level2 oplocks = No
>         vfs objects = zfsacl
>         nfs4:chown = Yes
>         nfs4:acedup = dontcare
>         nfs4:mode = simple
> 
> Is this a bug in samba? Or I missed something.
> 
> Thank you for any suggestions.
> 
> Regards
> 
> Lukasz
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