https://bugzilla.samba.org/show_bug.cgi?id=14521 Bug ID: 14521 Summary: CIFS mount shows only "vers=default" instead of specific SMB version Product: CifsVFS Version: 4.x Hardware: All OS: All Status: NEW Severity: normal Priority: P5 Component: kernel fs Assignee: sfrench@xxxxxxxxx Reporter: kolAflash@xxxxxxxxxxxx QA Contact: cifs-qa@xxxxxxxxx Target Milestone: --- /proc/mounts and the mount command don't show the auto negotiated version after mounting with vers=default (or without specifying vers=). Instead /proc/mounts just says vers=default. Client OS: openSUSE-LEAP-15.2 with Linux-5.3 This non-public bug seems to be similar. (I don't habe a RedHat license, so I can't see the details) https://access.redhat.com/solutions/4592681 I was only able to reproduce with Windows Server 2012. A Windows Server 2008 and Samba-4.6 (openSUSE-LEAP-42.3) work fine. (e.g. /proc/mounts shows vers=3.11) Workaround with some help from: https://wiki.samba.org/index.php/LinuxCIFS_troubleshooting echo 'module cifs +p' > /sys/kernel/debug/dynamic_debug/control echo 'file fs/cifs/* +p' > /sys/kernel/debug/dynamic_debug/control echo 7 > /proc/fs/cifs/cifsFYI mount -t cifs ... dmesg | grep -E 'cifs.*[123]\.[0-9]' # -> negotiated smb3.02 dialect So for me it's actually 3.02 what's been negotiated with Windows Server 2012. P.S. "man mount.cifs" may seem a little ambiguous about the vers=default behavior. Quote: ========== SMB protocol version. Allowed values are: [...] - default - Tries to negotiate the highest SMB2+ version supported by both the client and server. [...] The default since v4.13.5 is for the client and server to negotiate the highest possible version greater than or equal to ``2.1``. In kernels prior to v4.13, the default was ``1.0``. For kernels between v4.13 and v4.13.5 the default is ``3.0``. ========== The first one sound more like 2.0 <= vers < 3.0. While the second sounds more like 2.1 <= version (without upper limit). To me it looks like the second (2.1 <= version) is what's actually implemented (at least with Linux-5.3 on openSUSE-LEAP-15.2). -- You are receiving this mail because: You are the QA Contact for the bug.
