samba - May 2013 - File deleted while locked

Hi,

I'm running Samba 4.0.0 on a RHEL 6.4 machine and have created a simple
share with all the default configuration options. I've also created an
application (running on the RHEL box) that does the following:

- detects a file appearing in the share (using Inotify looking for the
IN_CLOSE_WRITE event)
- open and fcntl lock the file
- do some processing
- move the file to somewhere else in the filesystem

When I use a Windows 7 machine to copy a file to the share (using explorer) my
app works fine. However if I copy a file as before, but then while my app is
processing the file if I copy the file to the share again, I get a dialog in
Windows stating the file is locked, 'Try Again' or 'Cancel'. If
I press Cancel, the dialog goes away but so does the file within the share. When
my app tries to move the file it fails because it no longer exists.

Looking at the wireshark output on the Windows machine I see that a SetInfo
request is made with a SMB2_FILE_DISPOSITION_INFO and 'Delete on close
set', followed by a success response. I assume this is the cause of the file
deletion? I have to admit to being a novice at both SMB and Samba so apologies
in advance if I'm a little vague.

Is the above expected even though I have locked the file?

For further info, I disabled oplocks for my share with no change in behaviour.

Keith

On Thu, May 23, 2013 at 11:56 AM,
<nipponunited.keithrob91 at spamgourmet.com>
wrote:
> Hi,
>
> I'm running Samba 4.0.0 on a RHEL 6.4 machine and have created a simple
share with all the default configuration options. I've also created an
application (running on the RHEL box) that does the following:
Update, definitely. My published toolchain for building Samba 4.0.5 as
SRPM's, and with the option of acting as a domain controller, is at
https://github.com/nkadel/samba-4.0.5-srpm.
> - detects a file appearing in the share (using Inotify looking for the
IN_CLOSE_WRITE event)
> - open and fcntl lock the file
> - do some processing
> - move the file to somewhere else in the filesystem
>
> When I use a Windows 7 machine to copy a file to the share (using explorer)
my app works fine. However if I copy a file as before, but then while my app is
processing the file if I copy the file to the share again, I get a dialog in
Windows stating the file is locked, 'Try Again' or 'Cancel'. If
I press Cancel, the dialog goes away but so does the file within the share. When
my app tries to move the file it fails because it no longer exists.
>
> Looking at the wireshark output on the Windows machine I see that a SetInfo
request is made with a SMB2_FILE_DISPOSITION_INFO and 'Delete on close
set', followed by a success response. I assume this is the cause of the file
deletion? I have to admit to being a novice at both SMB and Samba so apologies
in advance if I'm a little vague.
>
> Is the above expected even though I have locked the file?
>
> For further info, I disabled oplocks for my share with no change in
behaviour.
Update first, then be ready to publish your smb.conf.

Sorry for slow reply, having trouble with my email!
I don't think updating is the answer, the reason I say that is because stock
RHEL 6.4 comes with Samba 3.6.9 (I think) and this did exactly the same thing
and where I originally noticed the behaviour. I discovered RHEL had a more
recent version and updated to that (4.0.0). Therefore what I am describing
appears to have been around for a while now. Additionally, my preference (for
various reasons) is to stick with a supported RHEL version of Samba and not
build my own.

Happy to post smb.conf if required.

Keith
----- Original Message -----
From: Nico Kadel-Garcia - nkadel at gmail.com
Sent: 05/26/13 02:08 PM
To: nipponunited.keithrob91 at spamgourmet.com
Subject: Re: [Samba] File deleted while locked

On Thu, May 23, 2013 at 11:56 AM, <nipponunited.keithrob91 at
spamgourmet.com> wrote: > Hi, > > I'm running Samba 4.0.0 on a
RHEL 6.4 machine and have created a simple share with all the default
configuration options. I've also created an application (running on the RHEL
box) that does the following: Update, definitely. My published toolchain for
building Samba 4.0.5 as SRPM's, and with the option of acting as a domain
controller, is at https://github.com/nkadel/samba-4.0.5-srpm. > - detects a
file appearing in the share (using Inotify looking for the IN_CLOSE_WRITE event)
> - open and fcntl lock the file > - do some processing > - move the
file to somewhere else in the filesystem > > When I use a Windows 7
machine to copy a file to the share (using explorer) my app works fine. However
if I copy a file as before, but then while my app is processing the file if I
copy the file to the share again, I get a dialog in Windows stating the file is
locked, 'Try Again' or 'Cancel'. If I
 press Cancel, the dialog goes away but so does the file within the share. When
my app tries to move the file it fails because it no longer exists. > >
Looking at the wireshark output on the Windows machine I see that a SetInfo
request is made with a SMB2_FILE_DISPOSITION_INFO and 'Delete on close
set', followed by a success response. I assume this is the cause of the file
deletion? I have to admit to being a novice at both SMB and Samba so apologies
in advance if I'm a little vague. > > Is the above expected even
though I have locked the file? > > For further info, I disabled oplocks
for my share with no change in behaviour. Update first, then be ready to publish
your smb.conf.