Quick follow up on one thing I can't reproduce from George's scrub:
[36365.549230] BTRFS error (device sda8): scrub: tree block
1777055424512 spanning stripes, ignored. logical=1777055367168
[36365.549262] attempt to access beyond end of device
sda8: rw=0, want=3470811376, limit=3470811312
I think this is just a benign artifact of the convert, and once the
ext2_saved/image file is deleted, it will go away. I've asked upstream
about it but I'm not sure when I'll hear back. Before deleting the
ext2_saved/image file consider making a metadata dump. It's used for
debugging. It doesn't contain file data so it's quite a lot smaller
than the rollback image, but it does contain file names so it could be
a privacy issue. Anyway, if you want to make a metadata dump of the
ext4 file system this is how to do it:
mount -o ro,rescue=all /dev/sda8 /mnt/btrfs
losetup -r /dev/loop1 /mnt/btrfs/ext2_saved/image
e2image -Q /dev/loop1 /path/to/sda8ext4-e2image.bin
I estimate the file could be around 700MB (maybe up to 2G). It can be
compressed:
tar -S -acf sda8ext4-e2image.bin.tar.gz sda8ext4-e2image.bin
--
Chris Murphy
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