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Include RelFileLocator fields individually in BufferTag.

Browse Source 
This is preparatory work for a project to increase the number of bits
in a RelFileNumber from 32 to 56.

Along the way, introduce static inline accessor functions for a couple
of BufferTag fields.

Dilip Kumar, reviewed by me. The overall patch series has also had
review at various times from Andres Freund, Ashutosh Sharma, Hannu
Krosing, Vignesh C, Álvaro Herrera, and Tom Lane.

Discussion: http://postgr.es/m/CAFiTN-trubju5YbWAq-BSpZ90-Z6xCVBQE8BVqXqANOZAF1Znw@mail.gmail.com
This commit is contained in:
Robert Haas
2022-08-24 15:50:48 -04:00
parent 396d348b04
commit 82ac34db20
5 changed files with 145 additions and 73 deletions
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64
src/include/storage/buf_internals.h
View File

@@ -90,18 +90,51 @@
*/
typedef struct buftag
{
RelFileLocator rlocator; /* physical relation identifier */
ForkNumber forkNum;
Oid spcOid; /* tablespace oid */
Oid dbOid; /* database oid */
RelFileNumber relNumber; /* relation file number */
ForkNumber forkNum; /* fork number */
BlockNumber blockNum; /* blknum relative to begin of reln */
} BufferTag;
static inline RelFileNumber
BufTagGetRelNumber(const BufferTag *tag)
{
return tag->relNumber;
}
static inline ForkNumber
BufTagGetForkNum(const BufferTag *tag)
{
return tag->forkNum;
}
static inline void
BufTagSetRelForkDetails(BufferTag *tag, RelFileNumber relnumber,
ForkNumber forknum)
{
tag->relNumber = relnumber;
tag->forkNum = forknum;
}
static inline RelFileLocator
BufTagGetRelFileLocator(const BufferTag *tag)
{
RelFileLocator rlocator;
rlocator.spcOid = tag->spcOid;
rlocator.dbOid = tag->dbOid;
rlocator.relNumber = BufTagGetRelNumber(tag);
return rlocator;
}
static inline void
ClearBufferTag(BufferTag *tag)
{
tag->rlocator.spcOid = InvalidOid;
tag->rlocator.dbOid = InvalidOid;
tag->rlocator.relNumber = InvalidRelFileNumber;
tag->forkNum = InvalidForkNumber;
tag->spcOid = InvalidOid;
tag->dbOid = InvalidOid;
BufTagSetRelForkDetails(tag, InvalidRelFileNumber, InvalidForkNumber);
tag->blockNum = InvalidBlockNumber;
}
@@ -109,19 +142,32 @@ static inline void
InitBufferTag(BufferTag *tag, const RelFileLocator *rlocator,
ForkNumber forkNum, BlockNumber blockNum)
{
tag->rlocator = *rlocator;
tag->forkNum = forkNum;
tag->spcOid = rlocator->spcOid;
tag->dbOid = rlocator->dbOid;
BufTagSetRelForkDetails(tag, rlocator->relNumber, forkNum);
tag->blockNum = blockNum;
}
static inline bool
BufferTagsEqual(const BufferTag *tag1, const BufferTag *tag2)
{
return RelFileLocatorEquals(tag1->rlocator, tag2->rlocator) &&
return (tag1->spcOid == tag2->spcOid) &&
(tag1->dbOid == tag2->dbOid) &&
(tag1->relNumber == tag2->relNumber) &&
(tag1->blockNum == tag2->blockNum) &&
(tag1->forkNum == tag2->forkNum);
}
static inline bool
BufTagMatchesRelFileLocator(const BufferTag *tag,
const RelFileLocator *rlocator)
{
return (tag->spcOid == rlocator->spcOid) &&
(tag->dbOid == rlocator->dbOid) &&
(BufTagGetRelNumber(tag) == rlocator->relNumber);
}
/*
* The shared buffer mapping table is partitioned to reduce contention.
* To determine which partition lock a given tag requires, compute the tag's