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Hi,
btrfs send -c stopped working for me several months ago. My setup is
actually very simple. On the "send" side I have:
# btrfs sub list -u / | grep rootfs-snapshot-
ID 2221 gen 93340 top level 5 uuid adf43113-0442-9847-9ce4-7d9c06e77602
path rootfs-snapshot-20150923
ID 2262 gen 96026 top level 5 uuid 49f34ca5-42da-7d4b-a159-c3027650d8e6
path rootfs-snapshot-20150929
Several other subvolumes also exist there, just in case it matters.
On the receive side:
# btrfs sub list -R /mnt/cryptobackup/ | grep rootfs-snapshot-20150923
ID 1532 gen 3066 top level 5 received_uuid
adf43113-0442-9847-9ce4-7d9c06e77602 path snapshots/rootfs-snapshot-20150923
As you can see the uuids for rootfs-snapshot-20150923 are the same on
both sides. If I try to send|receive /rootfs-snapshot-20150929 using
rootfs-snapshot-20150923 as clone source it fails:
# btrfs send -c /rootfs-snapshot-20150923 /rootfs-snapshot-20150929 |
btrfs receive /mnt/cryptobackup/snapshots/
At subvol /rootfs-snapshot-20150929
ERROR: parent determination failed for 2221
while it works fine if I use btrfs send -p. This is always reproducible,
it fails every time across reboots and kernel upgrades; it works every
time with -p.
In both / and /mnt/cryptobackup I didn't mount any special subvolid:
# btrfs sub get-default /
ID 5 (FS_TREE)
# btrfs inspect-internal rootid /
5
# btrfs sub get-default /mnt/cryptobackup/
ID 5 (FS_TREE)
# btrfs inspect-internal rootid /mnt/cryptobackup/
5
so nothing strange here. Some other possibly useful information:
$ uname -a
Linux mandragola 4.2.0-1-amd64 #1 SMP Debian 4.2.3-1 (2015-10-06) x86_64
GNU/Linux
so you have guessed that I'm running an up to date Debian system. Keep
in mind that it is several kernel versions that I'm getting this
problem, it's nothing specific to this one.
$ btrfs --version
btrfs-progs v4.1.2
# btrfs fi show
Label: none uuid: 5651d651-5c48-425f-9fc9-56f2a9ad004f
Total devices 1 FS bytes used 118.24GiB
devid 1 size 237.97GiB used 218.02GiB path /dev/sda2
Label: none uuid: c4db7f4f-b976-4d36-bd76-76e818341cef
Total devices 1 FS bytes used 934.71GiB
devid 1 size 1.82TiB used 941.03GiB path /dev/mapper/cryptobackup
$ btrfs fi df /
Data, single: total=212.01GiB, used=116.98GiB
System, single: total=4.00MiB, used=48.00KiB
Metadata, single: total=6.01GiB, used=1.27GiB
GlobalReserve, single: total=448.00MiB, used=0.00B
$ btrfs fi df /mnt/cryptobackup/
Data, single: total=932.00GiB, used=931.70GiB
System, DUP: total=8.00MiB, used=128.00KiB
System, single: total=4.00MiB, used=0.00B
Metadata, DUP: total=4.50GiB, used=3.01GiB
Metadata, single: total=8.00MiB, used=0.00B
GlobalReserve, single: total=512.00MiB, used=0.00B
$ dmesg | grep -i btrfs | curl -F "sprunge=<-" http://sprunge.us
http://sprunge.us/EiHE
If I hit a bug I'll be happy to help in finding it, just tell me if you
need further information. Otherwise, if I'm just missing something, I'll
appreciate any hint.
Thank you,
Paride
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