Apologies for the repeat send for anyone that gets this twice; I was informed there was a problem with my mail setup and many ISPs would block the first message. I have also simplified the reproduction case.
--- Reproduction case after running into the same problem as Paride Legovini: http://article.gmane.org/gmane.comp.file-systems.btrfs/48706/match=send To recap, the basic problem is that you can get into a state where "btrfs-send -c" fails for a subvolume, with "ERROR: parent determination failed for 9622". It appears the problem happens when the 'parent_uuid' does not exist. I'm pretty sure this isn't the intended behavior, and it's certainly preventing me from copying my backups right now. burn% sudo btrfs subvol create a Create subvolume './a' burn% sudo btrfs subvol snapshot a -r a-r Create a readonly snapshot of 'a' in './a-r' burn% sudo btrfs subvol create b1 Create subvolume './b1' burn% sudo btrfs subvol snapshot b1 -r b2 Create a readonly snapshot of 'b1' in './b2' burn% sudo btrfs subvol del b1 Delete subvolume (no-commit): '/data/b1' burn% sudo btrfs send -c b2 a-r >/dev/null At subvol a-r ERROR: parent determination failed for 9637 /data/a-r Name: a-r UUID: 819415e9-ea57-4a4d-9745-78a65f19b614 Parent UUID: e63b985a-3463-be4c-8ad5-900cd147ef7d Received UUID: - Creation time: 2016-02-20 10:19:59 -0800 Subvolume ID: 9638 Generation: 18524 Gen at creation: 18524 Parent ID: 5 Top level ID: 5 Flags: readonly Snapshot(s): burn% sudo btrfs subvolume show b2 /data/b2 Name: b2 UUID: e1d0314d-9c2a-5240-9f4c-1716b7e87741 Parent UUID: 00920504-c78b-ee42-af9f-05f4600321bb Received UUID: - Creation time: 2016-02-20 10:19:01 -0800 Subvolume ID: 9637 Generation: 18522 Gen at creation: 18522 Parent ID: 5 Top level ID: 5 Flags: readonly Snapshot(s): [root@burn ~]# btrfs --version btrfs-progs v4.4.1 [root@burn ~]# uname -a Linux burn 4.5.0-1-ARCH #1 SMP PREEMPT Tue Mar 15 09:41:03 CET 2016 x86_64 GNU/Linux --- Zachary Vance -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
