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Arrange for the postmaster (and standalone backends, initdb, etc) to

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chdir into PGDATA and subsequently use relative paths instead of absolute
paths to access all files under PGDATA.  This seems to give a small
performance improvement, and it should make the system more robust
against naive DBAs doing things like moving a database directory that
has a live postmaster in it.  Per recent discussion.
This commit is contained in:
Tom Lane
2005-07-04 04:51:52 +00:00
parent 7504f0bae8
commit eb5949d190
27 changed files with 364 additions and 474 deletions
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13
src/backend/access/transam/twophase.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.7 2005/06/28 05:08:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.8 2005/07/04 04:51:44 tgl Exp $
*
* NOTES
* Each global transaction is associated with a global transaction
@@ -661,7 +661,7 @@ TwoPhaseGetDummyProc(TransactionId xid)
/************************************************************************/
#define TwoPhaseFilePath(path, xid) \
snprintf(path, MAXPGPATH, "%s/%s/%08X", DataDir, TWOPHASE_DIR, xid)
snprintf(path, MAXPGPATH, TWOPHASE_DIR "/%08X", xid)
/*
* 2PC state file format:
@@ -1434,14 +1434,11 @@ PrescanPreparedTransactions(void)
{
TransactionId origNextXid = ShmemVariableCache->nextXid;
TransactionId result = origNextXid;
char dir[MAXPGPATH];
DIR *cldir;
struct dirent *clde;
snprintf(dir, MAXPGPATH, "%s/%s", DataDir, TWOPHASE_DIR);
cldir = AllocateDir(dir);
while ((clde = ReadDir(cldir, dir)) != NULL)
cldir = AllocateDir(TWOPHASE_DIR);
while ((clde = ReadDir(cldir, TWOPHASE_DIR)) != NULL)
{
if (strlen(clde->d_name) == 8 &&
strspn(clde->d_name, "0123456789ABCDEF") == 8)
@@ -1540,7 +1537,7 @@ RecoverPreparedTransactions(void)
DIR *cldir;
struct dirent *clde;
snprintf(dir, MAXPGPATH, "%s/%s", DataDir, TWOPHASE_DIR);
snprintf(dir, MAXPGPATH, "%s", TWOPHASE_DIR);
cldir = AllocateDir(dir);
while ((clde = ReadDir(cldir, dir)) != NULL)