[Samba] extra readdir operation when writing to a non-existent file

Zhang Bingjun (Eddy) eddymier at gmail.com
Wed May 12 03:35:15 MDT 2010

Hi Alain,

Your suggestion works. Thank you very much!

Best regards,
Zhang Bingjun, Eddy

On Wed, May 12, 2010 at 4:33 PM, Alain Knaff <alain at knaff.lu> wrote:

> On 12/05/10 10:16, Zhang Bingjun (Eddy) wrote:
> > hi samba fellows,
> >
> > It is my first time to ask questions in samba mail list. Very sorry if
> > my question is very naive.
> >
> > The problem is when I write to
> > a non-existent file from windows to a linux export, there will be an
> > extra readdir operation triggered. If I write to an existent file, no
> > readdir operation will be triggered.
> I'm still pretty knew on this list too, but let me take a guess about
> what may be going on:
> Windows (by default) is case-insensitive, Unix is case-sensitive. So, if
> you write to a non existant file (let's call it "test.txt"), the kernel
> will tell samba that the file "test.txt" doesn't exist. However, there
> could be a file called "Test.txt" or "TEST.TXT", ... The open call won't
> tell that, the only way for samba to find out is to do a readdir and
> manually go through the list to see whether anything matches in a
> case-insensitive way.
> >
> > How could I avoid the extra readdir operation in all cases when I am just
> > writing to a file?
> Switching samba to a case-sensitive mode might help, try putting the
> following into your smb.conf:
> case sensitive = yes
> if that alone doesn't help, you might try setting all 4 of the following:
> default case = lower
> sensitive = yes
> preserve case = no
> short preserve case = No
> Indeed, the smb.conf says the following:
> default case = upper/lower
>    controls what the default case is for new filenames (ie. files that
>    donŽt currently exist in the filesystem). Default lower. IMPORTANT
>    NOTE: This option will be used to modify the case of all incoming
>    client filenames, not just new filenames if the options case
>    sensitive = yes, preserve case = No, short preserve case = No are
>    set. This change is needed as part of the optimisations for
>    directories containing large numbers of files.
> >
> > Very much appreciate your help!
> Regards,
> Alain

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