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Re: [Samba] (DeviceIoControl, FSCTL_SET_SPARSE)

Hi Again, 

Doing some testing just now with `dd if=/dev/zero of=./sparser.img bs=1 count=0 seek=0` and `truncate -s 0 asparsefile` with no issues on the share, but not across samba.  I was thinking, what If I mounted that to  /mnt using cifs, and try to use the linux to use the same two methods above as a test.  Ill probably will have done that by the next reply, however any thoughts on that are welcome. 


-----Original Message-----
From: noid@xxxxxxxxxxxx [mailto:noid@xxxxxxxxxxxx] 
Sent: Thursday, February 16, 2017 1:21 AM
To: 'samba@xxxxxxxxxxxxxxx' <samba@xxxxxxxxxxxxxxx>
Subject: RE: [Samba] (DeviceIoControl, FSCTL_SET_SPARSE)

Hi David,

Configured as you mention, and prior with the other tweaks I had in the first place,  Im getting the same results, which is "FSUTIL utility requires a Local NTFS Volume", and mapping it.

I then went to contig, `contig -n X:\share\sparesefile 0`, as well as a few other size.  Maybe im using it wrong, but some testing on contig has only "Access is denied" when I try to write to anything. 

Oh one change, I put these settings only in Global (only, as opposed to also in the pool definition), I just realized.  I believe global should be enough shouldn’t it? 

    #share:fake_fscaps = 0
    store dos attributes = yes
    strict allocate = yes

I hadn’t heard any mention of the importance of strict allocate, would that setting be wise then?

What are some other tools I might try that with?  I can try straight on the linux too, just as a test, if there is any tools recommended to test that with.  I will also look something up for that tomorrow as well.  

Thanks for the info, much appreciated.

-----Original Message-----
From: samba [mailto:samba-bounces@xxxxxxxxxxxxxxx] On Behalf Of David Disseldorp via samba
Sent: Wednesday, February 15, 2017 5:23 AM
To: brian lamb via samba <samba@xxxxxxxxxxxxxxx>
Subject: Re: [Samba] (DeviceIoControl, FSCTL_SET_SPARSE)

On Tue, 14 Feb 2017 23:16:22 -0800, brian lamb via samba wrote:

> Thanks for your response. 
> The Error message is for e.g.:
> Cannot write file attributes of "\\MYHOST\backup\sparse\My Family Tree 6.0.zip.ffs_tmp".
> Error Code 1: Incorrect function. (DeviceIoControl, FSCTL_SET_SPARSE)

Hmm, that seems to indicate that the initial fsctl request is failing.
Could you please try manually setting a file on the Samba share as sparse with "fsutil sparse setflag <file_on_samba_share>":

Does it succeed when Samba is configured as per below?

> Samba Version:
> Samba version 4.4.4
> PID     Username     Group        Machine                                   Protocol Version  Encryption           Signing
> ----------------------------------------------------------------------------------------------------------------------------------------
> 21582   backupadmin sys1       myhost (ipv4:         SMB2_10           -                    -
> I just tried the option   " store dos attributes = no"
> Im getting the same error as above still unfortunately, but im doing 
> some more thorough testing on that.  WOud you happen to know if I want 
> the other two options set, and to what, at all? (> strict allocate & 
> share:fake_fscaps = 0)

Given that the application is complaining about FSCTL_SET_SPARSE failure, I would guess that it requires sparse-file support. Please set "store dos attributes = yes" and drop the fake_fscaps setting.

Cheers, David

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