[Samba] How to detect active users

Marcello Romani mromani at ottotecnica.com
Wed Jul 27 03:33:20 MDT 2011

Il 26/07/2011 10:06, Malte Forkel ha scritto:
> Am 25.07.2011 23:34, schrieb Chris Weiss:
>> On Mon, Jul 25, 2011 at 3:50 PM, Pascal Valois<pascal.valois at devinci.fr>  wrote:
>>> Le 25/07/11 22:44, Jeremy Allison a écrit :
>>>> On Mon, Jul 25, 2011 at 10:21:35PM +0200, Malte Forkel wrote:
>>>>> Hi,
>>>>> I'm running Samba 3.2.5 on a server which I'd like to shut down when it
>>>>> is not used by any client.
>>>>> Is there a way to detect whether any user has opened a file on the
>>>>> server?
>>>> smbstatus will tell you.
>>> slight correction,
>>> smbstatus tells you what file are used and by who, currently.
>>> not who HAS opened a file.
>> smbstatus will also tell you who has an active connection to what
>> shares, even if they have yet to actually open some file.
>> while it's possible for someone to open a file in app that reads to
>> ram then closes, such as notepad.exe, making edits and letting them
>> sit without saving for long enough that an smb client would disconnect
>> the session is unlikely given the "save often" mentality that most
>> have gotten from using PC's.  From application crashes, to power
>> outages, to 2 year old kids pressing buttons, save often!
> Thanks for your suggestions!
>> so depending on what you mean by "has opened" (opened before and still
>> use it, or opened before and may have close it), smbstatus may be the
>> answer or not.
> By "has opened" I mean "opened before and still use it". Actually,
> something more like "would be disappointed if the server went down".
> Ideally, a user might e.g. open a couple of source files to analyze them
> and after a while (without making changes of saving anything) try to
> open another file in the same directory.
> I've done a couple of experiments with smbstatus, specifically its -S
> and -L options. My clients run Windows 7 SP1 and Windows XP SP3. While a
> Windows Expolores is opened for a share (or one of its subdirectories),
> "smbstatus -S" will list that share. But once the Explorer is closed,
> the entry is cleared. Similarly, using a File Open Dialog only produces
> a short lived entry.
> "smbstatus -L" does not seem to produce any list entries once a user has
> opened a file. May be I have to specify some more specific locking in
> smb.conf?
> I've also experimented with "root preexec" and "root postexec". Those
> seem to be triggered at the same time the output of "smbstatus -S" changes.
> Currently, I'm not even sure Samba preserves the kind of state
> information required to detect the usage scenario  I'm interested in. Is
> there any concept of an "open file" in Windows/Samba, after all? May be
> it depends on the application used to open the file?

I suggest trying smbstatus -B too (shows byterange locks).

Also, reading the whole thread it seems to me (FWIW) that the only way 
to be 100% sure that a samba restart won't disappoint anyone is have 
smbstatus show no active connection.

Marcello Romani

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