For what it is worth, it works for me on head.
I'm wondering that if _mdfd_openseg may return NULL, then ISTM that
"opened_directly" should logically be false, because it was not opened?
If so, maybe consider something like:
opened_directy = (seg != NULL);
Now it does not change the result because the later code seems garded
against a NULL seg, but it does not look right to have a boolean to say
that a segment was opened if it was not indeed the case.
Given the comments, I understand that the truncation implementation is a
shortcut with a sting, as a lot of functions must then take into account
that something unusual may have happen somewhere and deal with it...
Also, I do not understand why this issue is raised by the flushing patch,
it seems rather independent.
I'm not sure this is the best way to go about this. I can see valid
arguments for *always* using _mdfd_openseg() in mdsync(); and I'm
wondering whether we shouldn't make EXTENSION_* into a bitmask
I thought about that when I looked at the previous fix, but it seemed that
not all combinations made sense.
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