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Adjust btree index build procedure so that the btree metapage looks

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invalid (has the wrong magic number) until the build is entirely
complete.  This turns out to cost no additional writes in the normal
case, since we were rewriting the metapage at the end of the process
anyway.  In normal scenarios there's no real gain in security, because
a failed index build would roll back the transaction leaving an unused
index file, but for rebuilding shared system indexes this seems to add
some useful protection.
This commit is contained in:
Tom Lane
2003-09-29 23:40:26 +00:00
parent 6b4caf53e6
commit e33f205a94
6 changed files with 71 additions and 28 deletions
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5
src/backend/access/nbtree/nbtree.c
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.105 2003/08/04 02:39:57 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.106 2003/09/29 23:40:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -112,7 +112,8 @@ btbuild(PG_FUNCTION_ARGS)
RelationGetRelationName(index));
/* initialize the btree index metadata page */
_bt_metapinit(index);
/* mark it valid right away only if using slow build */
_bt_metapinit(index, !buildstate.usefast);
if (buildstate.usefast)
{