Alexander,
>> Same is true for BTRFS_FILE_EXTENT_PREALLOC extents, I think. Those
>> also don't contain real data.
>> So something like:
>> if (left_disknr == 0 || left_type == BTRFS_FILE_EXTENT_REG) {
>> ret = 1;
>> goto out;
>> }
> Do you mean "|| left_type == BTRFS_FILE_EXTENT_PREALLOC"?
I see your point about bytenr==0, I missed that on the parent tree it
can be something else.
As for PREALLOC: can it happen that on differential send we see extent
of type BTRFS_FILE_EXTENT_PREALLOC? And can it happen that parent had
some real data extent in that place? I don't know the answer, but if
yes, then we must treat PREALLOC as normal extent. So this case is
similar to bytenr==0.
Thanks,
Alex.
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