I'm unsure about switching enum to #define, could be an enum still with
explicit values set, something like:
An enum doesn't have a benefit for a bitmask imo - you can't "legally"
use it as a type for functions accepting the bitmask.
I do not understand. I suggested to use enum to enumerate the bitmask
constants, ISTM that it does not preclude to use it as a bitmask as you
do, it is just a replacement of the #define? The type constraint on the
enum does not disallow bitmasking values, I checked with both gcc & clang.
I'm fuzzy about the _OPEN_DELETED part because it is an oxymoron. Is it
No. The relevant explanation is at the top of the file:
* -- Optionally, any number of inactive segments of size 0 blocks.
* Inactive segments are those that once contained data but are currently
* not needed because of an mdtruncate() operation. The reason for leaving
* them present at size zero, rather than unlinking them, is that other
* backends and/or the checkpointer might be holding open file references
* such segments. If the relation expands again after mdtruncate(), such
* that a deactivated segment becomes active again, it is important that
* such file references still be valid --- else data might get written
* out to an unlinked old copy of a segment file that will eventually
Then should it be _OPEN_INACTIVE[TED] or _OPEN_TRUNCATED rather than
_OPEN_DELETED, which is contradictory?
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