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localbuf: Introduce StartLocalBufferIO()

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To initiate IO on a shared buffer we have StartBufferIO(). For temporary table
buffers no similar function exists - likely because the code for that
currently is very simple due to the lack of concurrency.

However, the upcoming AIO support will make it possible to re-encounter a
local buffer, while the buffer already is the target of IO. In that case we
need to wait for already in-progress IO to complete. This commit makes it
easier to add the necessary code, by introducing StartLocalBufferIO().

Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
Discussion: https://postgr.es/m/CAAKRu_b9anbWzEs5AAF9WCvcEVmgz-1AkHSQ-CLLy-p7WHzvFw@mail.gmail.com
This commit is contained in:
Andres Freund
2025-03-15 12:30:07 -04:00
parent 4b4d33b9ea
commit 771ba90298
3 changed files with 39 additions and 6 deletions
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src/include/storage/buf_internals.h
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@@ -473,6 +473,7 @@ extern BlockNumber ExtendBufferedRelLocal(BufferManagerRelation bmr,
extern void MarkLocalBufferDirty(Buffer buffer);
extern void TerminateLocalBufferIO(BufferDesc *bufHdr, bool clear_dirty,
uint32 set_flag_bits);
extern bool StartLocalBufferIO(BufferDesc *bufHdr, bool forInput);
extern void FlushLocalBuffer(BufferDesc *bufHdr, SMgrRelation reln);
extern void DropRelationLocalBuffers(RelFileLocator rlocator,
ForkNumber forkNum,