On 08/10/12, Arne Jansen (sensille@xxxxxxx) wrote:
> On 10/08/12 18:30, Rory Campbell-Lange wrote:
> > I can send snapshots to <volume>, but not <volume>/<dir>. Please advise
> > if what I am doing is incorrect.
> > Try and snap to /mnt/<subdir>
> > root@orchard:/bkp# mkdir /mnt/snaps
> > root@orchard:/bkp# btrfs send snaps/snap_081012_1715 | btrfs receive /mnt/snaps
> > > At subvol snaps/snap_081012_1715
> > > At subvol snap_081012_1715
> > root@orchard:/bkp# btrfs send -p snaps/snap_081012_1715 \
> > snaps/snap_081012_1716 | btrfs receive /mnt/snaps
> > > At subvol snaps/snap_081012_1716
> > > At snapshot snap_081012_1716
> > > ERROR: open snaps/snap_081012_1715 failed. No such file or directory
> > root@orchard:/bkp# ls /mnt/snaps
> > > snap_081012_1715
>
> The target has to be a subvol also. But interestingly enough, it also
> fails for a subvol. The base send works, the incremental fails, because
> btrfs receive can't find snaps/snap_081012_1715. If you give /mnt/snaps
> as the target for the base and just /mnt for the incremental, it works.
> There's clearly something broken there...
Actually, this does work:
root@orchard:~# mkfs.btrfs /dev/sdb1
...snip...
> Btrfs v0.20-rc1-37-g91d9eec
root@orchard:/bkp# ls
> snaps subvol
root@orchard:/bkp# mount /dev/sdb1 /mnt
root@orchard:/bkp# btrfs subvolume create /mnt/subvol
> Create subvolume '/mnt/subvol'
root@orchard:/bkp# btrfs send snaps/snap_081012_1715 | btrfs receive /mnt/subvol
> At subvol snaps/snap_081012_1715
> At subvol snap_081012_1715
root@orchard:/bkp# btrfs send -p snaps/snap_081012_1715 \
snaps/snap_081012_1716 | btrfs receive /mnt/subvol
> At subvol snaps/snap_081012_1716
> At snapshot snap_081012_1716
It certainly seems to work if the receive target is a subvolume other
than the implicit subvolume at the root of the mount point.
So one can only btrfs receive to a subvolume, which makes sense, and is
I believe the reason one cannot 'btrfs receive to a subdirectory' as set
out in the subject of my original email.
Are there any other problem cases you can see, Arne?
Regards
Rory
--
Rory Campbell-Lange
rory@xxxxxxxxxxxxxxxxxx
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