Hi Felix,
It seems some reported this problem before. The problem for your below case
is because you use latest btrfs-progs(v3.12?), which will need kernel
update,
kernel 3.12 is ok.
However, i think btrfs-progs should keep compatibility, i will send a
patch to
make things more friendly.
Thanks,
Wang
On 01/09/2014 06:04 AM, Felix Blanke wrote:
Hi List,
My backup stopped working and I can't figure out why. I'm using
send/receive with the "-p" switch for incremental backups using the
last snapshot as a parent snapshot for sending only the changed data.
The problem occurs using my own backup script. After I discovered the
problem I did a quick test using the exact commands from the wiki with
the same result: It doesn't work. Here is the output:
server ~ # ./test_snapshot.sh
++ btrfs subvolume snapshot -r /mnt/root1/@root_home/ /mnt/root1/snapshots/test
Create a readonly snapshot of '/mnt/root1/@root_home/' in
'/mnt/root1/snapshots/test'
++ sync
++ btrfs send /mnt/root1/snapshots/test
++ btrfs receive /mnt/backup1/
At subvol /mnt/root1/snapshots/test
At subvol test
++ btrfs subvolume snapshot -r /mnt/root1/@root_home/
/mnt/root1/snapshots/test_new
Create a readonly snapshot of '/mnt/root1/@root_home/' in
'/mnt/root1/snapshots/test_new'
++ sync
++ btrfs send -p /mnt/root1/snapshots/test /mnt/root1/snapshots/test_new
++ btrfs receive /mnt/backup1/
At subvol /mnt/root1/snapshots/test_new
At snapshot test_new
ERROR: open @/test failed. No such file or directory
I don't get where the "@/" in front of the snapshot name comes from.
It could be that I had a subvolume named @, but this doesn't exists
anymore and I don't understand why this would be important for the
send/receive.
Some more details about the fs:
server ~ # btrfs subvol list /mnt/root1/
ID 259 gen 568053 top level 5 path @root
ID 261 gen 568053 top level 5 path @var
ID 263 gen 568049 top level 5 path @home
ID 302 gen 568053 top level 5 path @owncloud_chroot
ID 421 gen 568038 top level 5 path @root_home
ID 30560 gen 563661 top level 5 path snapshots/home_2014-01-06-19:33_d
ID 30561 gen 563665 top level 5 path
snapshots/owncloud_chroot_2014-01-06-19:34_d
ID 30562 gen 563674 top level 5 path snapshots/root_home_2014-01-06-19:38_d
ID 30563 gen 563675 top level 5 path snapshots/var_2014-01-06-19:39_d
ID 30564 gen 563697 top level 5 path snapshots/root_2014-01-06-19:50_d
server ~ # btrfs subvol get-default /mnt/root1/
ID 5 (FS_TREE)
server ~ # ls -l /mnt/root1/
total 0
drwxr-xr-x. 1 root root 30 May 10 2013 @home
drwxr-xr-x. 1 root root 134 Jan 5 19:27 @owncloud_chroot
drwxr-xr-x. 1 root root 204 Nov 24 18:16 @root
drwx------. 1 root root 468 Jan 8 22:47 @root_home
drwxr-xr-x. 1 root root 114 Oct 7 17:39 @var
drwx------. 1 root root 420 Jan 8 22:50 snapshots
Any ideas? Thanks in advance.
Regards,
Felix
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