File cloning across subvolumes with BTRFS_IOC_CLONE ioctl

File cloning across subvolumes with BTRFS_IOC_CLONE ioctl

[redneb]

It seems that the BTRFS_IOC_CLONE ioctl fails when trying to do a 
cross-subvolume clone of a file. Chris Mason suggested in the past ([1]) 
that this should be possible. Am I missing something?

[1] http://kerneltrap.org/mailarchive/linux-btrfs/2010/6/10/6884911

Re: File cloning across subvolumes with BTRFS_IOC_CLONE ioctl

[Jérôme Poulin]

I've got the same problem, and that post clearly seems to say it is pos=
sible.
cp --reflink=3Dalways source subvolume1/   gives me:
cp: failed to clone `xxxx': Invalid cross-device link

Even on the same subvolume I get 10% of the files telling me the same.

btrfs-bcp copy the files in its integrity.


On Tue, Jul 20, 2010 at 1:39 AM,  <redneb@gmx.com> wrote:
> It seems that the BTRFS_IOC_CLONE ioctl fails when trying to do a
> cross-subvolume clone of a file. Chris Mason suggested in the past ([=
1])
> that this should be possible. Am I missing something?
>
> [1] http://kerneltrap.org/mailarchive/linux-btrfs/2010/6/10/6884911
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs=
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> the body of a message to majordomo@vger.kernel.org
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Re: File cloning across subvolumes with BTRFS_IOC_CLONE ioctl

[Chris Mason]

On Wed, Jul 21, 2010 at 11:11:13AM -0400, J=E9r=F4me Poulin wrote:
> I've got the same problem, and that post clearly seems to say it is p=
ossible.
> cp --reflink=3Dalways source subvolume1/   gives me:
> cp: failed to clone `xxxx': Invalid cross-device link
>=20
> Even on the same subvolume I get 10% of the files telling me the same=
=2E
>=20
> btrfs-bcp copy the files in its integrity.

Ok, this is a bug in the ioctl.  I'll fix it up.

-chris
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Re: File cloning across subvolumes with BTRFS_IOC_CLONE ioctl

[Jérôme Poulin]

After pulling the new changes, I tried to do the cp --reflink=3Dalways
and still get files with no data in it.
cp --reflink=3Dalways on different subvolume: http://pastebin.com/zutMP=
e1h
ls -lisa on source: http://pastebin.com/8BU2Xyr5
ls -lisa on destination after trying to copy: http://pastebin.com/EPV70=
cD3

However, copying on the same subvolume now works perfectly, so I guess
this is fixed.

On Wed, Jul 21, 2010 at 11:32 AM, Chris Mason <chris.mason@oracle.com> =
wrote:
> On Wed, Jul 21, 2010 at 11:11:13AM -0400, J=E9r=F4me Poulin wrote:
>> I've got the same problem, and that post clearly seems to say it is =
possible.
>> cp --reflink=3Dalways source subvolume1/ =A0 gives me:
>> cp: failed to clone `xxxx': Invalid cross-device link
>>
>> Even on the same subvolume I get 10% of the files telling me the sam=
e.
>>
>> btrfs-bcp copy the files in its integrity.
>
> Ok, this is a bug in the ioctl. =A0I'll fix it up.
>
> -chris
>
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Re: File cloning across subvolumes with BTRFS_IOC_CLONE ioctl

[Jérôme Poulin]

Here is the real destination, I had pasted the same as source:
http://pastebin.com/nyTDeaae

On Mon, Jul 26, 2010 at 8:55 AM, J=E9r=F4me Poulin <jeromepoulin@gmail.=
com> wrote:
> After pulling the new changes, I tried to do the cp --reflink=3Dalway=
s and still get files with no data in it.
> cp --reflink=3Dalways on different subvolume: http://pastebin.com/zut=
MPe1h
> ls -lisa on source: http://pastebin.com/8BU2Xyr5
> ls -lisa on destination after trying to copy: http://pastebin.com/EPV=
70cD3
>
> However, copying on the same subvolume now works perfectly, so I gues=
s this is fixed.
>
> On Wed, Jul 21, 2010 at 11:32 AM, Chris Mason <chris.mason@oracle.com=
> wrote:
>> On Wed, Jul 21, 2010 at 11:11:13AM -0400, J=E9r=F4me Poulin wrote:
>>> I've got the same problem, and that post clearly seems to say it is=
 possible.
>>> cp --reflink=3Dalways source subvolume1/ =A0 gives me:
>>> cp: failed to clone `xxxx': Invalid cross-device link
>>>
>>> Even on the same subvolume I get 10% of the files telling me the sa=
me.
>>>
>>> btrfs-bcp copy the files in its integrity.
>>
>> Ok, this is a bug in the ioctl. =A0I'll fix it up.
>>
>> -chris
>>
>
>
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