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7e0cce0265
Do read/write permissions checks at most once per large object descriptor, not once per lo_read or lo_write call as before. The repeated tests were quite useless in the read case since the snapshot-based tests were guaranteed to produce the same answer every time. In the write case, the extra tests could in principle detect revocation of write privileges after a series of writes has started --- but there's a race condition there anyway, since we'd check privileges before performing and certainly before committing the write. So there's no real advantage to checking every single time, and we might as well redefine it as "only check the first time". On the same reasoning, remove the LargeObjectExists checks in inv_write and inv_truncate. We already checked existence when the descriptor was opened, and checking again doesn't provide any real increment of safety that would justify the cost. |
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