One of the things that Samba server appears to be doing wrong is that Samba is creating the file as a sparse file and returning that it is not a sparse file - this obviously creates a problem because an fallocate on a non-sparse file can be a no op ... but the server didn't tell us it was a sparse file ... On Mon, Aug 3, 2020 at 10:59 AM Steve French <smfrench@xxxxxxxxx> wrote: > > So locally on xfs this works, but Samba when receiving the request > remotely apparently isn't doing the fallocate. Would be curious if > this works with vfs_btrfs and btrfs filesystem on the share - or a > Samba server bug. > > On Sun, Aug 2, 2020 at 9:55 PM Xiaoli Feng <xifeng@xxxxxxxxxx> 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 -- Thanks, Steve
