Finish up the flat-files project: get rid of GetRawDatabaseInfo() hack
in favor of looking at the flat file copy of pg_database during backend startup. This should finally eliminate the various corner cases in which backend startup fails unexpectedly because it isn't able to distinguish live and dead tuples in pg_database. Simplify locking on pg_database to be similar to the rules used with pg_shadow and pg_group, and eliminate FlushRelationBuffers operations that were used only to reduce the odds of failure of GetRawDatabaseInfo. initdb forced due to addition of a trigger to pg_database.
This commit is contained in:
Tom Lane
parent
ffef9a9de4
commit
0fc4ecf935
@ -3,13 +3,19 @@
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* dbcommands.c
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* Database management commands (create/drop database).
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*
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* Note: database creation/destruction commands take ExclusiveLock on
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* pg_database to ensure that no two proceed in parallel. We must use
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* at least this level of locking to ensure that no two backends try to
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* write the flat-file copy of pg_database at once. We avoid using
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* AccessExclusiveLock since there's no need to lock out ordinary readers
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* of pg_database.
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.150 2005/02/20 02:21:34 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.151 2005/02/26 18:43:33 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -446,13 +452,13 @@ createdb(const CreatedbStmt *stmt)
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/*
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* Now OK to grab exclusive lock on pg_database.
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*/
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pg_database_rel = heap_openr(DatabaseRelationName, AccessExclusiveLock);
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pg_database_rel = heap_openr(DatabaseRelationName, ExclusiveLock);
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/* Check to see if someone else created same DB name meanwhile. */
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if (get_db_info(dbname, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL))
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{
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/* Don't hold lock while doing recursive remove */
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heap_close(pg_database_rel, AccessExclusiveLock);
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heap_close(pg_database_rel, ExclusiveLock);
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remove_dbtablespaces(dboid);
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ereport(ERROR,
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(errcode(ERRCODE_DUPLICATE_DATABASE),
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@ -498,13 +504,6 @@ createdb(const CreatedbStmt *stmt)
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/* Update indexes */
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CatalogUpdateIndexes(pg_database_rel, tuple);
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/*
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* Force dirty buffers out to disk, so that newly-connecting backends
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* will see the new database in pg_database right away. (They'll see
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* an uncommitted tuple, but they don't care; see GetRawDatabaseInfo.)
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*/
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FlushRelationBuffers(pg_database_rel, MaxBlockNumber);
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/* Close pg_database, but keep exclusive lock till commit */
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heap_close(pg_database_rel, NoLock);
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@ -542,12 +541,15 @@ dropdb(const char *dbname)
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* Obtain exclusive lock on pg_database. We need this to ensure that
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* no new backend starts up in the target database while we are
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* deleting it. (Actually, a new backend might still manage to start
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* up, because it will read pg_database without any locking to
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* discover the database's OID. But it will detect its error in
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* ReverifyMyDatabase and shut down before any serious damage is done.
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* See postinit.c.)
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* up, because it isn't able to lock pg_database while starting. But
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* it will detect its error in ReverifyMyDatabase and shut down before
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* any serious damage is done. See postinit.c.)
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*
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* An ExclusiveLock, rather than AccessExclusiveLock, is sufficient
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* since ReverifyMyDatabase takes RowShareLock. This allows ordinary
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* readers of pg_database to proceed in parallel.
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*/
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pgdbrel = heap_openr(DatabaseRelationName, AccessExclusiveLock);
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pgdbrel = heap_openr(DatabaseRelationName, ExclusiveLock);
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if (!get_db_info(dbname, &db_id, &db_owner, NULL,
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&db_istemplate, NULL, NULL, NULL, NULL))
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@ -638,14 +640,6 @@ dropdb(const char *dbname)
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*/
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remove_dbtablespaces(db_id);
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/*
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* Force dirty buffers out to disk, so that newly-connecting backends
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* will see the database tuple marked dead in pg_database right away.
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* (They'll see an uncommitted deletion, but they don't care; see
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* GetRawDatabaseInfo.)
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*/
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FlushRelationBuffers(pgdbrel, MaxBlockNumber);
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/* Close pg_database, but keep exclusive lock till commit */
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heap_close(pgdbrel, NoLock);
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@ -671,10 +665,10 @@ RenameDatabase(const char *oldname, const char *newname)
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key2;
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/*
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* Obtain AccessExclusiveLock so that no new session gets started
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* Obtain ExclusiveLock so that no new session gets started
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* while the rename is in progress.
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*/
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rel = heap_openr(DatabaseRelationName, AccessExclusiveLock);
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rel = heap_openr(DatabaseRelationName, ExclusiveLock);
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ScanKeyInit(&key,
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Anum_pg_database_datname,
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@ -742,14 +736,6 @@ RenameDatabase(const char *oldname, const char *newname)
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systable_endscan(scan);
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/*
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* Force dirty buffers out to disk, so that newly-connecting backends
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* will see the renamed database in pg_database right away. (They'll
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* see an uncommitted tuple, but they don't care; see
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* GetRawDatabaseInfo.)
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*/
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FlushRelationBuffers(rel, MaxBlockNumber);
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/* Close pg_database, but keep exclusive lock till commit */
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heap_close(rel, NoLock);
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@ -779,9 +765,10 @@ AlterDatabaseSet(AlterDatabaseSetStmt *stmt)
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valuestr = flatten_set_variable_args(stmt->variable, stmt->value);
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/*
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* We need AccessExclusiveLock so we can safely do FlushRelationBuffers.
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* We don't need ExclusiveLock since we aren't updating the
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* flat file.
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*/
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rel = heap_openr(DatabaseRelationName, AccessExclusiveLock);
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rel = heap_openr(DatabaseRelationName, RowExclusiveLock);
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ScanKeyInit(&scankey,
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Anum_pg_database_datname,
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BTEqualStrategyNumber, F_NAMEEQ,
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@ -840,15 +827,7 @@ AlterDatabaseSet(AlterDatabaseSetStmt *stmt)
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systable_endscan(scan);
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/*
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* Force dirty buffers out to disk, so that newly-connecting backends
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* will see the altered row in pg_database right away. (They'll
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* see an uncommitted tuple, but they don't care; see
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* GetRawDatabaseInfo.)
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*/
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FlushRelationBuffers(rel, MaxBlockNumber);
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/* Close pg_database, but keep exclusive lock till commit */
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/* Close pg_database, but keep lock till commit */
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heap_close(rel, NoLock);
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/*
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@ -871,9 +850,10 @@ AlterDatabaseOwner(const char *dbname, AclId newOwnerSysId)
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Form_pg_database datForm;
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/*
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* We need AccessExclusiveLock so we can safely do FlushRelationBuffers.
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* We don't need ExclusiveLock since we aren't updating the
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* flat file.
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*/
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rel = heap_openr(DatabaseRelationName, AccessExclusiveLock);
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rel = heap_openr(DatabaseRelationName, RowExclusiveLock);
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ScanKeyInit(&scankey,
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Anum_pg_database_datname,
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BTEqualStrategyNumber, F_NAMEEQ,
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@ -937,22 +917,11 @@ AlterDatabaseOwner(const char *dbname, AclId newOwnerSysId)
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CatalogUpdateIndexes(rel, newtuple);
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heap_freetuple(newtuple);
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/* must release buffer pins before FlushRelationBuffers */
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systable_endscan(scan);
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/*
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* Force dirty buffers out to disk, so that newly-connecting backends
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* will see the altered row in pg_database right away. (They'll
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* see an uncommitted tuple, but they don't care; see
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* GetRawDatabaseInfo.)
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*/
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FlushRelationBuffers(rel, MaxBlockNumber);
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}
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else
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systable_endscan(scan);
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/* Close pg_database, but keep exclusive lock till commit */
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systable_endscan(scan);
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/* Close pg_database, but keep lock till commit */
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heap_close(rel, NoLock);
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/*
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@ -13,7 +13,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.301 2005/02/20 02:21:34 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.302 2005/02/26 18:43:33 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -704,11 +704,12 @@ vac_update_relstats(Oid relid, BlockNumber num_pages, double num_tuples,
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* We violate no-overwrite semantics here by storing new values for the
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* statistics columns directly into the tuple that's already on the page.
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* As with vac_update_relstats, this avoids leaving dead tuples behind
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* after a VACUUM; which is good since GetRawDatabaseInfo
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* can get confused by finding dead tuples in pg_database.
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* after a VACUUM.
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*
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* This routine is shared by full and lazy VACUUM. Note that it is only
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* applied after a database-wide VACUUM operation.
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*
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* Note that we don't bother to update the flat-file copy of pg_database.
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*/
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static void
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vac_update_dbstats(Oid dbid,
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@ -10,12 +10,13 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.139 2005/02/20 04:45:57 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.140 2005/02/26 18:43:33 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <ctype.h>
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#include <pwd.h>
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#include <fcntl.h>
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#include <sys/param.h>
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@ -37,6 +38,8 @@
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#include "utils/guc.h"
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#define atooid(x) ((Oid) strtoul((x), NULL, 10))
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/* Max size of username ident server can return */
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#define IDENT_USERNAME_MAX 512
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@ -1059,6 +1062,51 @@ load_hba(void)
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FreeFile(file);
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}
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/*
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* Read and parse one line from the flat pg_database file.
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*
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* Returns TRUE on success, FALSE if EOF; bad data causes elog(FATAL).
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*
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* Output parameters:
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* dbname: gets database name (must be of size NAMEDATALEN bytes)
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* dboid: gets database OID
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* dbtablespace: gets database's default tablespace's OID
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*
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* This is not much related to the other functions in hba.c, but we put it
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* here because it uses the next_token() infrastructure.
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*/
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bool
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read_pg_database_line(FILE *fp, char *dbname,
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Oid *dboid, Oid *dbtablespace)
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{
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char buf[MAX_TOKEN];
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if (feof(fp))
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return false;
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next_token(fp, buf, sizeof(buf));
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if (!buf[0])
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return false;
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if (strlen(buf) >= NAMEDATALEN)
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elog(FATAL, "bad data in flat pg_database file");
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strcpy(dbname, buf);
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next_token(fp, buf, sizeof(buf));
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if (!isdigit((unsigned char) buf[0]))
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elog(FATAL, "bad data in flat pg_database file");
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*dboid = atooid(buf);
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next_token(fp, buf, sizeof(buf));
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if (!isdigit((unsigned char) buf[0]))
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elog(FATAL, "bad data in flat pg_database file");
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*dbtablespace = atooid(buf);
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/* discard datfrozenxid */
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next_token(fp, buf, sizeof(buf));
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if (!isdigit((unsigned char) buf[0]))
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elog(FATAL, "bad data in flat pg_database file");
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/* expect EOL next */
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next_token(fp, buf, sizeof(buf));
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if (buf[0])
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elog(FATAL, "bad data in flat pg_database file");
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return true;
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}
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/*
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* Process one line from the ident config file.
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@ -22,7 +22,7 @@
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.3 2005/02/20 22:02:19 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.4 2005/02/26 18:43:33 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -243,10 +243,12 @@ write_database_file(Relation drel)
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Form_pg_database dbform = (Form_pg_database) GETSTRUCT(tuple);
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char *datname;
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Oid datoid;
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Oid dattablespace;
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TransactionId datfrozenxid;
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datname = NameStr(dbform->datname);
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datoid = HeapTupleGetOid(tuple);
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dattablespace = dbform->dattablespace;
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datfrozenxid = dbform->datfrozenxid;
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/*
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@ -276,13 +278,13 @@ write_database_file(Relation drel)
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}
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/*
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* The file format is: "dbname" oid frozenxid
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* The file format is: "dbname" oid tablespace frozenxid
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*
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* The xid is not needed for backend startup, but may be of use
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* for forensic purposes.
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*/
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fputs_quote(datname, fp);
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fprintf(fp, " %u %u\n", datoid, datfrozenxid);
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fprintf(fp, " %u %u %u\n", datoid, dattablespace, datfrozenxid);
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}
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heap_endscan(scan);
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@ -830,15 +832,3 @@ flatfile_update_trigger(PG_FUNCTION_ARGS)
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return PointerGetDatum(NULL);
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}
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/*
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* Old version of trigger --- remove after we can force an initdb
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*/
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extern Datum update_pg_pwd_and_pg_group(PG_FUNCTION_ARGS);
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Datum
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update_pg_pwd_and_pg_group(PG_FUNCTION_ARGS)
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{
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return flatfile_update_trigger(fcinfo);
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}
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.140 2005/02/20 21:46:49 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.141 2005/02/26 18:43:33 tgl Exp $
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*
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*
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*-------------------------------------------------------------------------
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@ -27,14 +27,16 @@
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#include "catalog/pg_database.h"
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#include "catalog/pg_shadow.h"
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#include "catalog/pg_tablespace.h"
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#include "libpq/hba.h"
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
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#include "postmaster/postmaster.h"
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#include "storage/backendid.h"
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#include "storage/fd.h"
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#include "storage/ipc.h"
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#include "storage/proc.h"
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#include "storage/sinval.h"
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#include "storage/smgr.h"
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#include "utils/flatfiles.h"
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#include "utils/fmgroids.h"
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#include "utils/guc.h"
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#include "utils/portal.h"
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@ -42,6 +44,7 @@
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#include "utils/syscache.h"
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static bool FindMyDatabase(const char *name, Oid *db_id, Oid *db_tablespace);
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static void ReverifyMyDatabase(const char *name);
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static void InitCommunication(void);
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static void ShutdownPostgres(int code, Datum arg);
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@ -51,18 +54,60 @@ static bool ThereIsAtLeastOneUser(void);
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/*** InitPostgres support ***/
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/* --------------------------------
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* ReverifyMyDatabase
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/*
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* FindMyDatabase -- get the critical info needed to locate my database
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*
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* Since we are forced to fetch the database OID out of pg_database without
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* benefit of locking or transaction ID checking (see utils/misc/database.c),
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* we might have gotten a wrong answer. Or, we might have attached to a
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* database that's in process of being destroyed by destroydb(). This
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* routine is called after we have all the locking and other infrastructure
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* running --- now we can check that we are really attached to a valid
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* database.
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* Find the named database in pg_database, return its database OID and the
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* OID of its default tablespace. Return TRUE if found, FALSE if not.
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*
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* In reality, if destroydb() is running in parallel with our startup,
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* Since we are not yet up and running as a backend, we cannot look directly
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* at pg_database (we can't obtain locks nor participate in transactions).
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* So to get the info we need before starting up, we must look at the "flat
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* file" copy of pg_database that is helpfully maintained by flatfiles.c.
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* This is subject to various race conditions, so after we have the
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* transaction infrastructure started, we have to recheck the information;
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* see ReverifyMyDatabase.
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*/
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static bool
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FindMyDatabase(const char *name, Oid *db_id, Oid *db_tablespace)
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{
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bool result = false;
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char *filename;
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FILE *db_file;
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char thisname[NAMEDATALEN];
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filename = database_getflatfilename();
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db_file = AllocateFile(filename, "r");
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if (db_file == NULL)
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ereport(FATAL,
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(errcode_for_file_access(),
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errmsg("could not open file \"%s\": %m", filename)));
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while (read_pg_database_line(db_file, thisname, db_id, db_tablespace))
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{
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if (strcmp(thisname, name) == 0)
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{
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result = true;
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break;
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}
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}
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FreeFile(db_file);
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pfree(filename);
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return result;
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}
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/*
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* ReverifyMyDatabase -- recheck info obtained by FindMyDatabase
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*
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* Since FindMyDatabase cannot lock pg_database, the information it read
|
||||
* could be stale; for example we might have attached to a database that's in
|
||||
* process of being destroyed by dropdb(). This routine is called after
|
||||
* we have all the locking and other infrastructure running --- now we can
|
||||
* check that we are really attached to a valid database.
|
||||
*
|
||||
* In reality, if dropdb() is running in parallel with our startup,
|
||||
* it's pretty likely that we will have failed before now, due to being
|
||||
* unable to read some of the system tables within the doomed database.
|
||||
* This routine just exists to make *sure* we have not started up in an
|
||||
@ -75,7 +120,6 @@ static bool ThereIsAtLeastOneUser(void);
|
||||
* To avoid having to read pg_database more times than necessary
|
||||
* during session startup, this place is also fitting to set up any
|
||||
* database-specific configuration variables.
|
||||
* --------------------------------
|
||||
*/
|
||||
static void
|
||||
ReverifyMyDatabase(const char *name)
|
||||
@ -87,10 +131,10 @@ ReverifyMyDatabase(const char *name)
|
||||
Form_pg_database dbform;
|
||||
|
||||
/*
|
||||
* Because we grab AccessShareLock here, we can be sure that destroydb
|
||||
* Because we grab RowShareLock here, we can be sure that dropdb()
|
||||
* is not running in parallel with us (any more).
|
||||
*/
|
||||
pgdbrel = heap_openr(DatabaseRelationName, AccessShareLock);
|
||||
pgdbrel = heap_openr(DatabaseRelationName, RowShareLock);
|
||||
|
||||
ScanKeyInit(&key,
|
||||
Anum_pg_database_datname,
|
||||
@ -104,7 +148,7 @@ ReverifyMyDatabase(const char *name)
|
||||
HeapTupleGetOid(tup) != MyDatabaseId)
|
||||
{
|
||||
/* OOPS */
|
||||
heap_close(pgdbrel, AccessShareLock);
|
||||
heap_close(pgdbrel, RowShareLock);
|
||||
|
||||
/*
|
||||
* The only real problem I could have created is to load dirty
|
||||
@ -131,7 +175,7 @@ ReverifyMyDatabase(const char *name)
|
||||
name)));
|
||||
|
||||
/*
|
||||
* OK, we're golden. Only other to-do item is to save the encoding
|
||||
* OK, we're golden. Next to-do item is to save the encoding
|
||||
* info out of the pg_database tuple.
|
||||
*/
|
||||
SetDatabaseEncoding(dbform->encoding);
|
||||
@ -143,7 +187,7 @@ ReverifyMyDatabase(const char *name)
|
||||
PGC_BACKEND, PGC_S_DEFAULT);
|
||||
|
||||
/*
|
||||
* Set up database-specific configuration variables.
|
||||
* Lastly, set up any database-specific configuration variables.
|
||||
*/
|
||||
if (IsUnderPostmaster)
|
||||
{
|
||||
@ -161,7 +205,7 @@ ReverifyMyDatabase(const char *name)
|
||||
}
|
||||
|
||||
heap_endscan(pgdbscan);
|
||||
heap_close(pgdbrel, AccessShareLock);
|
||||
heap_close(pgdbrel, RowShareLock);
|
||||
}
|
||||
|
||||
|
||||
@ -261,11 +305,9 @@ InitPostgres(const char *dbname, const char *username)
|
||||
/*
|
||||
* Find oid and tablespace of the database we're about to open.
|
||||
* Since we're not yet up and running we have to use the hackish
|
||||
* GetRawDatabaseInfo.
|
||||
* FindMyDatabase.
|
||||
*/
|
||||
GetRawDatabaseInfo(dbname, &MyDatabaseId, &MyDatabaseTableSpace);
|
||||
|
||||
if (!OidIsValid(MyDatabaseId))
|
||||
if (!FindMyDatabase(dbname, &MyDatabaseId, &MyDatabaseTableSpace))
|
||||
ereport(FATAL,
|
||||
(errcode(ERRCODE_UNDEFINED_DATABASE),
|
||||
errmsg("database \"%s\" does not exist",
|
||||
|
||||
@ -1,4 +1,12 @@
|
||||
# $PostgreSQL: pgsql/src/backend/utils/misc/Makefile,v 1.22 2003/11/29 19:52:03 pgsql Exp $
|
||||
#-------------------------------------------------------------------------
|
||||
#
|
||||
# Makefile--
|
||||
# Makefile for utils/misc
|
||||
#
|
||||
# IDENTIFICATION
|
||||
# $PostgreSQL: pgsql/src/backend/utils/misc/Makefile,v 1.23 2005/02/26 18:43:33 tgl Exp $
|
||||
#
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
subdir = src/backend/utils/misc
|
||||
top_builddir = ../../../..
|
||||
@ -6,10 +14,10 @@ include $(top_builddir)/src/Makefile.global
|
||||
|
||||
override CPPFLAGS := -I$(srcdir) $(CPPFLAGS)
|
||||
|
||||
OBJS = database.o superuser.o guc.o help_config.o ps_status.o
|
||||
OBJS = guc.o help_config.o ps_status.o superuser.o
|
||||
|
||||
# This location might depend on the installation directories. Therefore
|
||||
# we can't subsitute it into config.h.
|
||||
# we can't subsitute it into pg_config.h.
|
||||
ifdef krb_srvtab
|
||||
override CPPFLAGS += -DPG_KRB_SRVTAB='"$(krb_srvtab)"'
|
||||
endif
|
||||
|
||||
@ -1,189 +0,0 @@
|
||||
/*-------------------------------------------------------------------------
|
||||
*
|
||||
* database.c
|
||||
* miscellaneous initialization support stuff
|
||||
*
|
||||
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/utils/misc/database.c,v 1.63 2004/12/31 22:02:45 pgsql Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
#include "postgres.h"
|
||||
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include "access/xact.h"
|
||||
#include "catalog/catname.h"
|
||||
#include "catalog/catalog.h"
|
||||
#include "catalog/pg_database.h"
|
||||
#include "catalog/pg_tablespace.h"
|
||||
#include "miscadmin.h"
|
||||
#include "utils/syscache.h"
|
||||
|
||||
|
||||
static bool PhonyHeapTupleSatisfiesNow(HeapTupleHeader tuple);
|
||||
|
||||
|
||||
/* --------------------------------
|
||||
* GetRawDatabaseInfo() -- Find the OID and tablespace of the database.
|
||||
*
|
||||
* We need both the OID and the default tablespace in order to find
|
||||
* the database's system catalogs. Moreover the database's OID forms
|
||||
* half of the unique key for the system caches and lock tables, so
|
||||
* we must have it before we can use any of the cache mechanisms.
|
||||
* To get around these problems, this code opens and scans the
|
||||
* pg_database relation by hand.
|
||||
*
|
||||
* This code knows way more than it should about the layout of
|
||||
* tuples on disk, but there seems to be no help for that.
|
||||
* We're pulling ourselves up by the bootstraps here...
|
||||
* --------------------------------
|
||||
*/
|
||||
void
|
||||
GetRawDatabaseInfo(const char *name, Oid *db_id, Oid *db_tablespace)
|
||||
{
|
||||
int dbfd;
|
||||
int nbytes;
|
||||
HeapTupleData tup;
|
||||
Form_pg_database tup_db;
|
||||
Page pg;
|
||||
char *dbfname;
|
||||
RelFileNode rnode;
|
||||
|
||||
/* hard-wired path to pg_database */
|
||||
rnode.spcNode = GLOBALTABLESPACE_OID;
|
||||
rnode.dbNode = 0;
|
||||
rnode.relNode = RelOid_pg_database;
|
||||
|
||||
dbfname = relpath(rnode);
|
||||
|
||||
if ((dbfd = open(dbfname, O_RDONLY | PG_BINARY, 0)) < 0)
|
||||
ereport(FATAL,
|
||||
(errcode_for_file_access(),
|
||||
errmsg("could not open file \"%s\": %m", dbfname)));
|
||||
|
||||
pfree(dbfname);
|
||||
|
||||
/*
|
||||
* read and examine every page in pg_database
|
||||
*
|
||||
* Raw I/O! Read those tuples the hard way! Yow!
|
||||
*
|
||||
* Why don't we use the access methods or move this code someplace else?
|
||||
* This is really pg_database schema dependent code. Perhaps it
|
||||
* should go in lib/catalog/pg_database? -cim 10/3/90
|
||||
*
|
||||
* mao replies 4 apr 91: yeah, maybe this should be moved to
|
||||
* lib/catalog. however, we CANNOT use the access methods since those
|
||||
* use the buffer cache, which uses the relation cache, which requires
|
||||
* that the dbid be set, which is what we're trying to do here.
|
||||
*
|
||||
*/
|
||||
pg = (Page) palloc(BLCKSZ);
|
||||
|
||||
while ((nbytes = read(dbfd, pg, BLCKSZ)) == BLCKSZ)
|
||||
{
|
||||
OffsetNumber max = PageGetMaxOffsetNumber(pg);
|
||||
OffsetNumber lineoff;
|
||||
|
||||
/* look at each tuple on the page */
|
||||
for (lineoff = FirstOffsetNumber; lineoff <= max; lineoff++)
|
||||
{
|
||||
ItemId lpp = PageGetItemId(pg, lineoff);
|
||||
|
||||
/* if it's a freed tuple, ignore it */
|
||||
if (!ItemIdIsUsed(lpp))
|
||||
continue;
|
||||
|
||||
/* get a pointer to the tuple itself */
|
||||
tup.t_datamcxt = NULL;
|
||||
tup.t_data = (HeapTupleHeader) PageGetItem(pg, lpp);
|
||||
|
||||
/*
|
||||
* Check to see if tuple is valid (committed).
|
||||
*
|
||||
* XXX warning, will robinson: violation of transaction semantics
|
||||
* happens right here. We cannot really determine if the
|
||||
* tuple is valid without checking transaction commit status,
|
||||
* and the only way to do that at init time is to paw over
|
||||
* pg_clog by hand, too. Instead of checking, we assume that
|
||||
* the inserting transaction committed, and that any deleting
|
||||
* transaction did also, unless shown otherwise by on-row
|
||||
* commit status bits.
|
||||
*
|
||||
* All in all, this code is pretty shaky. We will cross-check
|
||||
* our result in ReverifyMyDatabase() in postinit.c.
|
||||
*
|
||||
* NOTE: if a bogus tuple in pg_database prevents connection to a
|
||||
* valid database, a fix is to connect to another database and
|
||||
* do "select * from pg_database". That should cause
|
||||
* committed and dead tuples to be marked with correct states.
|
||||
*
|
||||
* XXX wouldn't it be better to let new backends read the
|
||||
* database info from a flat file, handled the same way we
|
||||
* handle the password relation?
|
||||
*/
|
||||
if (!PhonyHeapTupleSatisfiesNow(tup.t_data))
|
||||
continue;
|
||||
|
||||
/*
|
||||
* Okay, see if this is the one we want.
|
||||
*/
|
||||
tup_db = (Form_pg_database) GETSTRUCT(&tup);
|
||||
|
||||
if (strcmp(name, NameStr(tup_db->datname)) == 0)
|
||||
{
|
||||
/* Found it; extract the db's OID and tablespace. */
|
||||
*db_id = HeapTupleGetOid(&tup);
|
||||
*db_tablespace = tup_db->dattablespace;
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* failed to find it... */
|
||||
*db_id = InvalidOid;
|
||||
*db_tablespace = InvalidOid;
|
||||
|
||||
done:
|
||||
close(dbfd);
|
||||
pfree(pg);
|
||||
}
|
||||
|
||||
/*
|
||||
* PhonyHeapTupleSatisfiesNow --- cut-down tuple time qual test
|
||||
*
|
||||
* This is a simplified version of HeapTupleSatisfiesNow() that does not
|
||||
* depend on having transaction commit info available. Any transaction
|
||||
* that touched the tuple is assumed committed unless later marked invalid.
|
||||
* (While we could think about more complex rules, this seems appropriate
|
||||
* for examining pg_database, since both CREATE DATABASE and DROP DATABASE
|
||||
* are non-roll-back-able.)
|
||||
*/
|
||||
static bool
|
||||
PhonyHeapTupleSatisfiesNow(HeapTupleHeader tuple)
|
||||
{
|
||||
if (!(tuple->t_infomask & HEAP_XMIN_COMMITTED))
|
||||
{
|
||||
if (tuple->t_infomask & HEAP_XMIN_INVALID)
|
||||
return false;
|
||||
|
||||
if (tuple->t_infomask & HEAP_MOVED_OFF)
|
||||
return false;
|
||||
/* else assume committed */
|
||||
}
|
||||
|
||||
if (tuple->t_infomask & HEAP_XMAX_INVALID) /* xid invalid or aborted */
|
||||
return true;
|
||||
|
||||
/* assume xmax transaction committed */
|
||||
if (tuple->t_infomask & HEAP_MARKED_FOR_UPDATE)
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
@ -39,7 +39,7 @@
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
* Portions taken from FreeBSD.
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.75 2005/02/22 04:38:22 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.76 2005/02/26 18:43:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -1319,15 +1319,18 @@ setup_shadow(void)
|
||||
char **line;
|
||||
static char *pg_shadow_setup[] = {
|
||||
/*
|
||||
* Create a trigger so that direct updates to pg_shadow will be
|
||||
* written to the flat password/group files pg_pwd and pg_group
|
||||
* Create triggers to ensure manual updates to shared catalogs
|
||||
* will be reflected into their "flat file" copies.
|
||||
*/
|
||||
"CREATE TRIGGER pg_sync_pg_pwd "
|
||||
" AFTER INSERT OR UPDATE OR DELETE ON pg_shadow "
|
||||
" FOR EACH ROW EXECUTE PROCEDURE update_pg_pwd_and_pg_group();\n",
|
||||
"CREATE TRIGGER pg_sync_pg_database "
|
||||
" AFTER INSERT OR UPDATE OR DELETE ON pg_database "
|
||||
" FOR EACH STATEMENT EXECUTE PROCEDURE flatfile_update_trigger();\n",
|
||||
"CREATE TRIGGER pg_sync_pg_group "
|
||||
" AFTER INSERT OR UPDATE OR DELETE ON pg_group "
|
||||
" FOR EACH ROW EXECUTE PROCEDURE update_pg_pwd_and_pg_group();\n",
|
||||
" FOR EACH STATEMENT EXECUTE PROCEDURE flatfile_update_trigger();\n",
|
||||
"CREATE TRIGGER pg_sync_pg_pwd "
|
||||
" AFTER INSERT OR UPDATE OR DELETE ON pg_shadow "
|
||||
" FOR EACH STATEMENT EXECUTE PROCEDURE flatfile_update_trigger();\n",
|
||||
|
||||
/*
|
||||
* needs to be done before alter user, because alter user checks
|
||||
|
||||
@ -37,7 +37,7 @@
|
||||
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.254 2005/02/25 16:13:29 teodor Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.255 2005/02/26 18:43:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -53,6 +53,6 @@
|
||||
*/
|
||||
|
||||
/* yyyymmddN */
|
||||
#define CATALOG_VERSION_NO 200502251
|
||||
#define CATALOG_VERSION_NO 200502261
|
||||
|
||||
#endif
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.349 2004/12/31 22:03:25 pgsql Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.350 2005/02/26 18:43:34 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* The script catalog/genbki.sh reads this file and generates .bki
|
||||
@ -2133,8 +2133,8 @@ DESCR("matches LIKE expression, case-insensitive");
|
||||
DATA(insert OID = 1661 ( bpcharicnlike PGNSP PGUID 12 f f t f i 2 16 "1042 25" _null_ texticnlike - _null_ ));
|
||||
DESCR("does not match LIKE expression, case-insensitive");
|
||||
|
||||
DATA(insert OID = 1689 ( update_pg_pwd_and_pg_group PGNSP PGUID 12 f f t f v 0 2279 "" _null_ update_pg_pwd_and_pg_group - _null_ ));
|
||||
DESCR("update pg_pwd and pg_group files");
|
||||
DATA(insert OID = 1689 ( flatfile_update_trigger PGNSP PGUID 12 f f t f v 0 2279 "" _null_ flatfile_update_trigger - _null_ ));
|
||||
DESCR("update flat-file copy of a shared catalog");
|
||||
|
||||
/* Oracle Compatibility Related Functions - By Edmund Mergl <E.Mergl@bawue.de> */
|
||||
DATA(insert OID = 868 ( strpos PGNSP PGUID 12 f f t f i 2 23 "25 25" _null_ textpos - _null_ ));
|
||||
|
||||
@ -4,19 +4,16 @@
|
||||
* Interface to hba.c
|
||||
*
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/libpq/hba.h,v 1.35 2004/02/02 16:58:30 neilc Exp $
|
||||
* $PostgreSQL: pgsql/src/include/libpq/hba.h,v 1.36 2005/02/26 18:43:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
#ifndef HBA_H
|
||||
#define HBA_H
|
||||
|
||||
#ifndef WIN32
|
||||
#include <netinet/in.h>
|
||||
#endif
|
||||
|
||||
#include "nodes/pg_list.h"
|
||||
|
||||
|
||||
typedef enum UserAuth
|
||||
{
|
||||
uaReject,
|
||||
@ -41,5 +38,7 @@ extern void load_user(void);
|
||||
extern void load_group(void);
|
||||
extern int hba_getauthmethod(hbaPort *port);
|
||||
extern int authident(hbaPort *port);
|
||||
extern bool read_pg_database_line(FILE *fp, char *dbname,
|
||||
Oid *dboid, Oid *dbtablespace);
|
||||
|
||||
#endif
|
||||
#endif /* HBA_H */
|
||||
|
||||
@ -13,7 +13,7 @@
|
||||
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.174 2004/12/31 22:03:19 pgsql Exp $
|
||||
* $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.175 2005/02/26 18:43:34 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* some of the information in this file should be moved to other files.
|
||||
@ -225,9 +225,6 @@ extern void check_stack_depth(void);
|
||||
|
||||
extern char *DatabasePath;
|
||||
|
||||
/* in utils/misc/database.c */
|
||||
extern void GetRawDatabaseInfo(const char *name, Oid *db_id, Oid *db_tablespace);
|
||||
|
||||
/* now in utils/init/miscinit.c */
|
||||
extern void SetDatabasePath(const char *path);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user