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@ -37,7 +37,7 @@ |
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* |
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* |
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* IDENTIFICATION |
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* $PostgreSQL: pgsql/src/backend/commands/tablespace.c,v 1.40 2007/01/05 22:19:26 momjian Exp $ |
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* $PostgreSQL: pgsql/src/backend/commands/tablespace.c,v 1.41 2007/01/25 04:35:10 momjian Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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@ -65,9 +65,12 @@ |
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#include "utils/lsyscache.h" |
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/* GUC variable */ |
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/* GUC variables */ |
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char *default_tablespace = NULL; |
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char *temp_tablespaces = NULL; |
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int next_temp_tablespace; |
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int num_temp_tablespaces; |
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static bool remove_tablespace_directories(Oid tablespaceoid, bool redo); |
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static void set_short_version(const char *path); |
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@ -930,6 +933,142 @@ GetDefaultTablespace(void) |
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return result; |
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} |
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/*
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* Routines for handling the GUC variable 'temp_tablespaces'. |
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*/ |
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/* assign_hook: validate new temp_tablespaces, do extra actions as needed */ |
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const char * |
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assign_temp_tablespaces(const char *newval, bool doit, GucSource source) |
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{ |
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char *rawname; |
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List *namelist; |
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ListCell *l; |
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/* Need a modifiable copy of string */ |
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rawname = pstrdup(newval); |
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/* Parse string into list of identifiers */ |
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if (!SplitIdentifierString(rawname, ',', &namelist)) |
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{ |
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/* syntax error in name list */ |
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pfree(rawname); |
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list_free(namelist); |
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return NULL; |
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} |
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num_temp_tablespaces = 0; |
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foreach(l, namelist) |
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{ |
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char *curname = (char *) lfirst(l); |
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/*
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* If we aren't inside a transaction, we cannot do database access so |
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* cannot verify the individual names. Must accept the list on faith. |
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*/ |
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if (source >= PGC_S_INTERACTIVE && IsTransactionState()) |
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{ |
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/*
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* Verify that all the names are valid tablspace names
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* We do not check for USAGE rights should we? |
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*/ |
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if (get_tablespace_oid(curname) == InvalidOid) |
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ereport((source == PGC_S_TEST) ? NOTICE : ERROR, |
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(errcode(ERRCODE_UNDEFINED_OBJECT), |
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errmsg("tablespace \"%s\" does not exist", curname))); |
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} |
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num_temp_tablespaces++; |
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} |
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/*
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* Select the first tablespace to use |
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*/ |
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next_temp_tablespace = MyProcPid % num_temp_tablespaces; |
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pfree(rawname); |
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list_free(namelist); |
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return newval; |
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} |
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/*
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* GetTempTablespace -- get the OID of the tablespace for temporary objects |
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* |
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* May return InvalidOid to indicate "use the database's default tablespace" |
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* |
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* This exists to hide the temp_tablespace GUC variable. |
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*/ |
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Oid |
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GetTempTablespace(void) |
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{ |
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Oid result; |
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char *curname = NULL; |
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char *rawname; |
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List *namelist; |
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ListCell *l; |
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int i = 0; |
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if ( temp_tablespaces == NULL ) |
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return InvalidOid; |
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/* Need a modifiable version of temp_tablespaces */ |
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rawname = pstrdup(temp_tablespaces); |
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/* Parse string into list of identifiers */ |
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if (!SplitIdentifierString(rawname, ',', &namelist)) |
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{ |
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/* syntax error in name list */ |
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pfree(rawname); |
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list_free(namelist); |
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return InvalidOid; |
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} |
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/*
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* Iterate through the list of namespaces until the one we need
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* (next_temp_tablespace)
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*/ |
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foreach(l, namelist) |
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{ |
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curname = (char *) lfirst(l); |
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if ( i == next_temp_tablespace ) |
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break; |
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i++; |
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} |
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/* Prepare for the next time the function is called */ |
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next_temp_tablespace++; |
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if (next_temp_tablespace == num_temp_tablespaces) |
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next_temp_tablespace = 0; |
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/* Fast path for temp_tablespaces == "" */ |
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if ( curname == NULL || curname[0] == '\0') { |
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list_free(namelist); |
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pfree(rawname); |
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return InvalidOid; |
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} |
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/*
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* It is tempting to cache this lookup for more speed, but then we would |
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* fail to detect the case where the tablespace was dropped since the GUC |
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* variable was set. Note also that we don't complain if the value fails |
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* to refer to an existing tablespace; we just silently return InvalidOid, |
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* causing the new object to be created in the database's tablespace. |
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*/ |
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result = get_tablespace_oid(curname); |
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/* We don't free rawname before because curname points to a part of it */ |
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pfree(rawname); |
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/*
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* Allow explicit specification of database's default tablespace in |
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* default_tablespace without triggering permissions checks. |
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*/ |
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if (result == MyDatabaseTableSpace) |
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result = InvalidOid; |
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list_free(namelist); |
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return result; |
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} |
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/*
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* get_tablespace_oid - given a tablespace name, look up the OID |
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Bruce Momjian
19 years ago