diff options
Diffstat (limited to 'src/include/access/transam.h')
| -rw-r--r-- | src/include/access/transam.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/include/access/transam.h b/src/include/access/transam.h index 775471d2a7d..2aaad2b9d51 100644 --- a/src/include/access/transam.h +++ b/src/include/access/transam.h @@ -15,6 +15,7 @@ #define TRANSAM_H #include "access/xlogdefs.h" +#include "common/relpath.h" /* ---------------- @@ -196,6 +197,33 @@ FullTransactionIdAdvance(FullTransactionId *dest) #define FirstUnpinnedObjectId 12000 #define FirstNormalObjectId 16384 +/* ---------- + * RelFileNumbers are normally assigned sequentially beginning with + * FirstNormalRelFileNumber, but for system tables the initial RelFileNumber + * is equal to the table OID. This scheme allows pg_upgrade to work: we expect + * that the new cluster will contain only system tables, and that none of those + * will have previously been rewritten, so any RelFileNumber which is in use + * in both the old and new clusters will be used for the same relation in both + * places. + * + * This is important because pg_upgrade can't reactively move conflicting + * relations out of the way. If it tries to set the RelFileNumber for a + * relation to some value that's already in use by a different relation, the + * upgrade will just fail. It's OK if the same RelFileNumber is used for the + * same relation, though, since then nothing needs to be changed. + * ---------- + */ +#define FirstNormalRelFileNumber ((RelFileNumber) 100000) + +#define CHECK_RELFILENUMBER_RANGE(relfilenumber) \ +do { \ + if ((relfilenumber) < 0 || (relfilenumber) > MAX_RELFILENUMBER) \ + ereport(ERROR, \ + errcode(ERRCODE_INVALID_PARAMETER_VALUE), \ + errmsg("relfilenumber %llu is out of range", \ + (unsigned long long) (relfilenumber))); \ +} while (0) + /* * VariableCache is a data structure in shared memory that is used to track * OID and XID assignment state. For largely historical reasons, there is @@ -215,6 +243,15 @@ typedef struct VariableCacheData uint32 oidCount; /* OIDs available before must do XLOG work */ /* + * These fields are protected by RelFileNumberGenLock. + */ + RelFileNumber nextRelFileNumber; /* next relfilenumber to assign */ + RelFileNumber loggedRelFileNumber; /* last logged relfilenumber */ + RelFileNumber flushedRelFileNumber; /* last flushed relfilenumber */ + XLogRecPtr loggedRelFileNumberRecPtr; /* xlog record pointer w.r.t. + * loggedRelFileNumber */ + + /* * These fields are protected by XidGenLock. */ FullTransactionId nextXid; /* next XID to assign */ @@ -293,6 +330,9 @@ extern void SetTransactionIdLimit(TransactionId oldest_datfrozenxid, extern void AdvanceOldestClogXid(TransactionId oldest_datfrozenxid); extern bool ForceTransactionIdLimitUpdate(void); extern Oid GetNewObjectId(void); +extern RelFileNumber GetNewRelFileNumber(Oid reltablespace, + char relpersistence); +extern void SetNextRelFileNumber(RelFileNumber relnumber); extern void StopGeneratingPinnedObjectIds(void); #ifdef USE_ASSERT_CHECKING |