FWIW, it looks like btrfs-convert is being dropped upstream. I just compiled mine from source, and it crashed after some heavy churning. The package description should be changed though (it explicitly mentions btrfs-convert). Here's a relevant thread:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854489 referring to the note in https://btrfs.wiki.kernel.org/index.php/Conversion_from_Ext3: “Warning: As of 4.0 kernels this feature is not often used or well tested anymore, and there have been some reports that the conversion doesn't work reliably. Feel free to try it out, but make sure you have backups.” My backtrace was different, but also related to btrfs_reserve_extent(). I also attempted ext4 -> btrfs. I'll post the BT but it's hardly helpful: # btrfs-convert /dev/sdc1 create btrfs filesystem: blocksize: 4096 nodesize: 16384 features: extref, skinny-metadata (default) creating ext2 image file Unable to find block group for 0 Unable to find block group for 0 Unable to find block group for 0 extent-tree.c:2764: alloc_tree_block: BUG_ON `ret` triggered, value -28 btrfs-convert(+0x1c4f6)[0x558cfb6c54f6] btrfs-convert(btrfs_alloc_free_block+0x1ff)[0x558cfb6cabaf] btrfs-convert(+0x14d63)[0x558cfb6bdd63] btrfs-convert(btrfs_search_slot+0x2af)[0x558cfb6bec8f] btrfs-convert(btrfs_csum_file_block+0x48f)[0x558cfb6d0c1f] btrfs-convert(+0xd944)[0x558cfb6b6944] btrfs-convert(main+0x19d1)[0x558cfb6b5df1] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f75d48fcb97] btrfs-convert(_start+0x2a)[0x558cfb6b64da] Aborted ** Bug watch added: Debian Bug tracker #854489 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854489 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1774794 Title: btrfs-convert executable is not included in btrfs-progs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/btrfs-progs/+bug/1774794/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
