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Create an fd.c entry point that is just like plain open(2) except that

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it will close VFDs if necessary to surmount ENFILE or EMFILE failures.
Make use of this in md.c, xlog.c, and user.c routines that were
formerly vulnerable to these failures.  In particular, this should
handle failures of mdblindwrt() that have been observed under heavy
load conditions.  (By golly, every other process on the system may
crash after Postgres eats up all the kernel FDs, but Postgres will
keep going!)
This commit is contained in:
Tom Lane
2000-06-02 03:58:34 +00:00
parent 60b941f9a4
commit b659ab07a2
5 changed files with 72 additions and 99 deletions
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62
src/backend/access/transam/xlog.c
View File

@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.13 2000/04/12 17:14:53 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.14 2000/06/02 03:58:34 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -44,8 +44,6 @@ bool StopIfError = false;
SPINLOCK ControlFileLockId;
SPINLOCK XidGenLockId;
extern bool ReleaseDataFile(void);
extern VariableCache ShmemVariableCache;
#define MinXLOGbuffers 4
@ -738,22 +736,13 @@ XLogFileInit(uint32 log, uint32 seg)
XLogFileName(path, log, seg);
unlink(path);
tryAgain:
#ifndef __CYGWIN__
fd = open(path, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
fd = BasicOpenFile(path, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
#else
fd = open(path, O_RDWR | O_CREAT | O_EXCL | O_BINARY, S_IRUSR | S_IWUSR);
fd = BasicOpenFile(path, O_RDWR | O_CREAT | O_EXCL | O_BINARY, S_IRUSR | S_IWUSR);
#endif
if (fd < 0 && (errno == EMFILE || errno == ENFILE))
{
fd = errno;
if (!ReleaseDataFile())
elog(STOP, "Create(logfile %u seg %u) failed: %d (and no one data file can be closed)",
logId, logSeg, fd);
goto tryAgain;
}
if (fd < 0)
elog(STOP, "Init(logfile %u seg %u) failed: %d",
elog(STOP, "Open(logfile %u seg %u) failed: %d",
logId, logSeg, errno);
if (lseek(fd, XLogSegSize - 1, SEEK_SET) != (off_t) (XLogSegSize - 1))
@ -783,20 +772,11 @@ XLogFileOpen(uint32 log, uint32 seg, bool econt)
XLogFileName(path, log, seg);
tryAgain:
#ifndef __CYGWIN__
fd = open(path, O_RDWR);
fd = BasicOpenFile(path, O_RDWR, S_IRUSR | S_IWUSR);
#else
fd = open(path, O_RDWR | O_BINARY);
fd = BasicOpenFile(path, O_RDWR | O_BINARY, S_IRUSR | S_IWUSR);
#endif
if (fd < 0 && (errno == EMFILE || errno == ENFILE))
{
fd = errno;
if (!ReleaseDataFile())
elog(STOP, "Open(logfile %u seg %u) failed: %d (and no one data file can be closed)",
logId, logSeg, fd);
goto tryAgain;
}
if (fd < 0)
{
if (econt && errno == ENOENT)
@ -1102,20 +1082,11 @@ UpdateControlFile()
{
int fd;
tryAgain:
#ifndef __CYGWIN__
fd = open(ControlFilePath, O_RDWR);
fd = BasicOpenFile(ControlFilePath, O_RDWR, S_IRUSR | S_IWUSR);
#else
fd = open(ControlFilePath, O_RDWR | O_BINARY);
fd = BasicOpenFile(ControlFilePath, O_RDWR | O_BINARY, S_IRUSR | S_IWUSR);
#endif
if (fd < 0 && (errno == EMFILE || errno == ENFILE))
{
fd = errno;
if (!ReleaseDataFile())
elog(STOP, "Open(cntlfile) failed: %d (and no one data file can be closed)",
fd);
goto tryAgain;
}
if (fd < 0)
elog(STOP, "Open(cntlfile) failed: %d", errno);
@ -1174,9 +1145,9 @@ BootStrapXLOG()
#endif
#ifndef __CYGWIN__
fd = open(ControlFilePath, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
fd = BasicOpenFile(ControlFilePath, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
#else
fd = open(ControlFilePath, O_RDWR | O_CREAT | O_EXCL | O_BINARY, S_IRUSR | S_IWUSR);
fd = BasicOpenFile(ControlFilePath, O_RDWR | O_CREAT | O_EXCL | O_BINARY, S_IRUSR | S_IWUSR);
#endif
if (fd < 0)
elog(STOP, "BootStrapXLOG failed to create control file (%s): %d",
@ -1288,20 +1259,11 @@ StartupXLOG()
/*
* Open/read Control file
*/
tryAgain:
#ifndef __CYGWIN__
fd = open(ControlFilePath, O_RDWR);
fd = BasicOpenFile(ControlFilePath, O_RDWR, S_IRUSR | S_IWUSR);
#else
fd = open(ControlFilePath, O_RDWR | O_BINARY);
fd = BasicOpenFile(ControlFilePath, O_RDWR | O_BINARY, S_IRUSR | S_IWUSR);
#endif
if (fd < 0 && (errno == EMFILE || errno == ENFILE))
{
fd = errno;
if (!ReleaseDataFile())
elog(STOP, "Open(\"%s\") failed: %d (and no one data file can be closed)",
ControlFilePath, fd);
goto tryAgain;
}
if (fd < 0)
elog(STOP, "Open(\"%s\") failed: %d", ControlFilePath, errno);