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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/include/access/nbtree.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nbtree.h,v 1.70 2003/08/08 21:42:32 momjian Exp $
* $Id: nbtree.h,v 1.71 2003/09/29 23:40:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -198,6 +198,7 @@ typedef BTItemData *BTItem;
#define XLOG_BTREE_NEWROOT 0xA0 /* new root page */
#define XLOG_BTREE_NEWMETA 0xB0 /* update metadata page */
#define XLOG_BTREE_NEWPAGE 0xC0 /* new index page during build */
#define XLOG_BTREE_INVALIDMETA 0xD0 /* new metadata, temp. invalid */
/*
* All that we need to find changed index tuple
@ -448,7 +449,7 @@ extern void _bt_insert_parent(Relation rel, Buffer buf, Buffer rbuf,
/*
* prototypes for functions in nbtpage.c
*/
extern void _bt_metapinit(Relation rel);
extern void _bt_metapinit(Relation rel, bool markvalid);
extern Buffer _bt_getroot(Relation rel, int access);
extern Buffer _bt_gettrueroot(Relation rel);
extern Buffer _bt_getbuf(Relation rel, BlockNumber blkno, int access);