fallocate can't change the cifs disk space usage

[Xiaoli Feng]

Hell Steve,


----- Original Message -----
> From: "Steve French" <smfrench at gmail.com>
> To: "Xiaoli Feng" <xifeng at redhat.com>
> Cc: "CIFS" <linux-cifs at vger.kernel.org>, "samba-technical" <samba-technical at lists.samba.org>
> Sent: Monday, August 3, 2020 12:42:32 PM
> Subject: Re: fallocate can't change the cifs disk space usage
> 
> Any luck trying the same thing to Windows and/or Azure to see if this
> is possible Samba bug - sounds like possible Samba server bug but need
> more information.

Thanks for quick response. When trying the same thing to windows. This issue is gone.
fallocate can update the space usage.

> 
> Are you using one of the Samba plug in VFS modules on the server (like
> vfs_btrfs)?

I'm not using any samba plug in vfs.
 
> 
> What does the filesystem show (before and after) on the server side
> (local file system not just the remote view that Samba is returning
> for statfs) when you try the df -h?

on the server side, the space usage reported by df also keep the same before and
after fallocate.

> 
> On Sun, Aug 2, 2020 at 9:55 PM Xiaoli Feng <xifeng at redhat.com> wrote:
> >
> > Hello all,
> >
> > Recently when I'm investigating the xfstests generic/213 generic/228
> > failures for cifs.
> > Found that fallocate can't change the cifs disk space usage. Comparing xfs
> > fileystem,
> > fallocate can update space usage.
> >
> > My tests is in 5.8.0-rc7+. I also file a bug for this issue.
> >   https://bugzilla.kernel.org/show_bug.cgi?id=208775
> >
> > # cat /etc/samba/smb.conf
> > [cifs]
> > path=/mnt/cifs
> > writeable=yes
> > # mount //localhost/cifs cifs -o
> > user=root,password=redhat,cache=none,actimeo=0
> > # df -h cifs
> > Filesystem        Size  Used Avail Use% Mounted on
> > //localhost/cifs   36G   23G   13G  66% /root/cifs
> > #  fallocate -o 0 -l 2g /root/cifs/file1
> > # df -h cifs
> > Filesystem        Size  Used Avail Use% Mounted on
> > //localhost/cifs   36G   23G   13G  66% /root/cifs
> > ]# ls -l cifs
> > total 1
> > -rwxr-xr-x. 1 root root 2147483648 Aug  2 21:57 file1
> >
> > Thanks.
> >
> > --
> > Best regards!
> > XiaoLi Feng 冯小丽
> >
> 
> 
> --
> Thanks,
> 
> Steve
> 
>