mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-24 21:17:20 +02:00
O_SYNC, or O_DSYNC (as available on a given platform). Add GUC parameter to control sync method. Also, add defense to XLogWrite to prevent it from going nuts if passed a target write position that's past the end of the buffers so far filled by XLogInsert.
3034 lines
86 KiB
C
3034 lines
86 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* xlog.c
|
|
* PostgreSQL transaction log manager
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.59 2001/03/16 05:44:33 tgl Exp $
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "postgres.h"
|
|
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <dirent.h>
|
|
#ifdef USE_LOCALE
|
|
#include <locale.h>
|
|
#endif
|
|
|
|
#include "access/transam.h"
|
|
#include "access/xact.h"
|
|
#include "catalog/catversion.h"
|
|
#include "catalog/pg_control.h"
|
|
#include "storage/sinval.h"
|
|
#include "storage/proc.h"
|
|
#include "storage/spin.h"
|
|
#include "storage/s_lock.h"
|
|
#include "storage/bufpage.h"
|
|
#include "access/xlog.h"
|
|
#include "access/xlogutils.h"
|
|
#include "utils/builtins.h"
|
|
#include "utils/relcache.h"
|
|
#include "miscadmin.h"
|
|
|
|
|
|
/*
|
|
* This chunk of hackery attempts to determine which file sync methods
|
|
* are available on the current platform, and to choose an appropriate
|
|
* default method. We assume that fsync() is always available, and that
|
|
* configure determined whether fdatasync() is.
|
|
*/
|
|
#define SYNC_METHOD_FSYNC 0
|
|
#define SYNC_METHOD_FDATASYNC 1
|
|
#define SYNC_METHOD_OPEN 2 /* used for both O_SYNC and O_DSYNC */
|
|
|
|
#if defined(O_SYNC)
|
|
# define OPEN_SYNC_FLAG O_SYNC
|
|
#else
|
|
# if defined(O_FSYNC)
|
|
# define OPEN_SYNC_FLAG O_FSYNC
|
|
# endif
|
|
#endif
|
|
|
|
#if defined(OPEN_SYNC_FLAG)
|
|
# if defined(O_DSYNC) && (O_DSYNC != OPEN_SYNC_FLAG)
|
|
# define OPEN_DATASYNC_FLAG O_DSYNC
|
|
# endif
|
|
#endif
|
|
|
|
#if defined(OPEN_DATASYNC_FLAG)
|
|
# define DEFAULT_SYNC_METHOD_STR "open_datasync"
|
|
# define DEFAULT_SYNC_METHOD SYNC_METHOD_OPEN
|
|
# define DEFAULT_SYNC_FLAGBIT OPEN_DATASYNC_FLAG
|
|
#else
|
|
# if defined(HAVE_FDATASYNC)
|
|
# define DEFAULT_SYNC_METHOD_STR "fdatasync"
|
|
# define DEFAULT_SYNC_METHOD SYNC_METHOD_FDATASYNC
|
|
# define DEFAULT_SYNC_FLAGBIT 0
|
|
# else
|
|
# define DEFAULT_SYNC_METHOD_STR "fsync"
|
|
# define DEFAULT_SYNC_METHOD SYNC_METHOD_FSYNC
|
|
# define DEFAULT_SYNC_FLAGBIT 0
|
|
# endif
|
|
#endif
|
|
|
|
|
|
/* Max time to wait to acquire XLog activity locks */
|
|
#define XLOG_LOCK_TIMEOUT (5*60*1000000) /* 5 minutes */
|
|
/* Max time to wait to acquire checkpoint lock */
|
|
#define CHECKPOINT_LOCK_TIMEOUT (10*60*1000000) /* 10 minutes */
|
|
|
|
/* User-settable parameters */
|
|
int CheckPointSegments = 3;
|
|
int XLOGbuffers = 8;
|
|
int XLOGfiles = 0; /* how many files to pre-allocate during ckpt */
|
|
int XLOG_DEBUG = 0;
|
|
char *XLOG_sync_method = NULL;
|
|
const char XLOG_sync_method_default[] = DEFAULT_SYNC_METHOD_STR;
|
|
char XLOG_archive_dir[MAXPGPATH]; /* null string means delete 'em */
|
|
|
|
/* these are derived from XLOG_sync_method by assign_xlog_sync_method */
|
|
static int sync_method = DEFAULT_SYNC_METHOD;
|
|
static int open_sync_bit = DEFAULT_SYNC_FLAGBIT;
|
|
|
|
#define MinXLOGbuffers 4
|
|
|
|
#define XLOG_SYNC_BIT (enableFsync ? open_sync_bit : 0)
|
|
|
|
|
|
/*
|
|
* ThisStartUpID will be same in all backends --- it identifies current
|
|
* instance of the database system.
|
|
*/
|
|
StartUpID ThisStartUpID = 0;
|
|
|
|
/* Are we doing recovery by reading XLOG? */
|
|
bool InRecovery = false;
|
|
|
|
/*
|
|
* MyLastRecPtr points to the start of the last XLOG record inserted by the
|
|
* current transaction. If MyLastRecPtr.xrecoff == 0, then we are not in
|
|
* a transaction or the transaction has not yet made any loggable changes.
|
|
*
|
|
* Note that XLOG records inserted outside transaction control are not
|
|
* reflected into MyLastRecPtr.
|
|
*/
|
|
XLogRecPtr MyLastRecPtr = {0, 0};
|
|
|
|
/*
|
|
* ProcLastRecPtr points to the start of the last XLOG record inserted by the
|
|
* current backend. It is updated for all inserts, transaction-controlled
|
|
* or not.
|
|
*/
|
|
static XLogRecPtr ProcLastRecPtr = {0, 0};
|
|
|
|
/*
|
|
* RedoRecPtr is this backend's local copy of the REDO record pointer
|
|
* (which is almost but not quite the same as a pointer to the most recent
|
|
* CHECKPOINT record). We update this from the shared-memory copy,
|
|
* XLogCtl->Insert.RedoRecPtr, whenever we can safely do so (ie, when we
|
|
* hold the Insert spinlock). See XLogInsert for details.
|
|
*/
|
|
static XLogRecPtr RedoRecPtr;
|
|
|
|
/* This lock must be held to read/update control file or create new log file */
|
|
SPINLOCK ControlFileLockId;
|
|
|
|
/*----------
|
|
* Shared-memory data structures for XLOG control
|
|
*
|
|
* LogwrtRqst indicates a byte position that we need to write and/or fsync
|
|
* the log up to (all records before that point must be written or fsynced).
|
|
* LogwrtResult indicates the byte positions we have already written/fsynced.
|
|
* These structs are identical but are declared separately to indicate their
|
|
* slightly different functions.
|
|
*
|
|
* We do a lot of pushups to minimize the amount of access to spinlocked
|
|
* shared memory values. There are actually three shared-memory copies of
|
|
* LogwrtResult, plus one unshared copy in each backend. Here's how it works:
|
|
* XLogCtl->LogwrtResult is protected by info_lck
|
|
* XLogCtl->Write.LogwrtResult is protected by logwrt_lck
|
|
* XLogCtl->Insert.LogwrtResult is protected by insert_lck
|
|
* One must hold the associated spinlock to read or write any of these, but
|
|
* of course no spinlock is needed to read/write the unshared LogwrtResult.
|
|
*
|
|
* XLogCtl->LogwrtResult and XLogCtl->Write.LogwrtResult are both "always
|
|
* right", since both are updated by a write or flush operation before
|
|
* it releases logwrt_lck. The point of keeping XLogCtl->Write.LogwrtResult
|
|
* is that it can be examined/modified by code that already holds logwrt_lck
|
|
* without needing to grab info_lck as well.
|
|
*
|
|
* XLogCtl->Insert.LogwrtResult may lag behind the reality of the other two,
|
|
* but is updated when convenient. Again, it exists for the convenience of
|
|
* code that is already holding insert_lck but not the other locks.
|
|
*
|
|
* The unshared LogwrtResult may lag behind any or all of these, and again
|
|
* is updated when convenient.
|
|
*
|
|
* The request bookkeeping is simpler: there is a shared XLogCtl->LogwrtRqst
|
|
* (protected by info_lck), but we don't need to cache any copies of it.
|
|
*
|
|
* Note that this all works because the request and result positions can only
|
|
* advance forward, never back up, and so we can easily determine which of two
|
|
* values is "more up to date".
|
|
*----------
|
|
*/
|
|
typedef struct XLogwrtRqst
|
|
{
|
|
XLogRecPtr Write; /* last byte + 1 to write out */
|
|
XLogRecPtr Flush; /* last byte + 1 to flush */
|
|
} XLogwrtRqst;
|
|
|
|
typedef struct XLogwrtResult
|
|
{
|
|
XLogRecPtr Write; /* last byte + 1 written out */
|
|
XLogRecPtr Flush; /* last byte + 1 flushed */
|
|
} XLogwrtResult;
|
|
|
|
/*
|
|
* Shared state data for XLogInsert.
|
|
*/
|
|
typedef struct XLogCtlInsert
|
|
{
|
|
XLogwrtResult LogwrtResult; /* a recent value of LogwrtResult */
|
|
XLogRecPtr PrevRecord; /* start of previously-inserted record */
|
|
uint16 curridx; /* current block index in cache */
|
|
XLogPageHeader currpage; /* points to header of block in cache */
|
|
char *currpos; /* current insertion point in cache */
|
|
XLogRecPtr RedoRecPtr; /* current redo point for insertions */
|
|
} XLogCtlInsert;
|
|
|
|
/*
|
|
* Shared state data for XLogWrite/XLogFlush.
|
|
*/
|
|
typedef struct XLogCtlWrite
|
|
{
|
|
XLogwrtResult LogwrtResult; /* current value of LogwrtResult */
|
|
uint16 curridx; /* cache index of next block to write */
|
|
} XLogCtlWrite;
|
|
|
|
/*
|
|
* Total shared-memory state for XLOG.
|
|
*/
|
|
typedef struct XLogCtlData
|
|
{
|
|
/* Protected by insert_lck: */
|
|
XLogCtlInsert Insert;
|
|
/* Protected by info_lck: */
|
|
XLogwrtRqst LogwrtRqst;
|
|
XLogwrtResult LogwrtResult;
|
|
/* Protected by logwrt_lck: */
|
|
XLogCtlWrite Write;
|
|
/*
|
|
* These values do not change after startup, although the pointed-to
|
|
* pages and xlblocks values certainly do. Permission to read/write
|
|
* the pages and xlblocks values depends on insert_lck and logwrt_lck.
|
|
*/
|
|
char *pages; /* buffers for unwritten XLOG pages */
|
|
XLogRecPtr *xlblocks; /* 1st byte ptr-s + BLCKSZ */
|
|
uint32 XLogCacheByte; /* # bytes in xlog buffers */
|
|
uint32 XLogCacheBlck; /* highest allocated xlog buffer index */
|
|
StartUpID ThisStartUpID;
|
|
|
|
/* This value is not protected by *any* spinlock... */
|
|
XLogRecPtr RedoRecPtr; /* see SetRedoRecPtr/GetRedoRecPtr */
|
|
|
|
slock_t insert_lck; /* XLogInsert lock */
|
|
slock_t info_lck; /* locks shared LogwrtRqst/LogwrtResult */
|
|
slock_t logwrt_lck; /* XLogWrite/XLogFlush lock */
|
|
slock_t chkp_lck; /* checkpoint lock */
|
|
} XLogCtlData;
|
|
|
|
static XLogCtlData *XLogCtl = NULL;
|
|
|
|
/*
|
|
* We maintain an image of pg_control in shared memory.
|
|
*/
|
|
static ControlFileData *ControlFile = NULL;
|
|
|
|
/*
|
|
* Macros for managing XLogInsert state. In most cases, the calling routine
|
|
* has local copies of XLogCtl->Insert and/or XLogCtl->Insert->curridx,
|
|
* so these are passed as parameters instead of being fetched via XLogCtl.
|
|
*/
|
|
|
|
/* Free space remaining in the current xlog page buffer */
|
|
#define INSERT_FREESPACE(Insert) \
|
|
(BLCKSZ - ((Insert)->currpos - (char *) (Insert)->currpage))
|
|
|
|
/* Construct XLogRecPtr value for current insertion point */
|
|
#define INSERT_RECPTR(recptr,Insert,curridx) \
|
|
( \
|
|
(recptr).xlogid = XLogCtl->xlblocks[curridx].xlogid, \
|
|
(recptr).xrecoff = \
|
|
XLogCtl->xlblocks[curridx].xrecoff - INSERT_FREESPACE(Insert) \
|
|
)
|
|
|
|
|
|
/* Increment an xlogid/segment pair */
|
|
#define NextLogSeg(logId, logSeg) \
|
|
do { \
|
|
if ((logSeg) >= XLogSegsPerFile-1) \
|
|
{ \
|
|
(logId)++; \
|
|
(logSeg) = 0; \
|
|
} \
|
|
else \
|
|
(logSeg)++; \
|
|
} while (0)
|
|
|
|
/* Decrement an xlogid/segment pair (assume it's not 0,0) */
|
|
#define PrevLogSeg(logId, logSeg) \
|
|
do { \
|
|
if (logSeg) \
|
|
(logSeg)--; \
|
|
else \
|
|
{ \
|
|
(logId)--; \
|
|
(logSeg) = XLogSegsPerFile-1; \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* Compute ID and segment from an XLogRecPtr.
|
|
*
|
|
* For XLByteToSeg, do the computation at face value. For XLByteToPrevSeg,
|
|
* a boundary byte is taken to be in the previous segment. This is suitable
|
|
* for deciding which segment to write given a pointer to a record end,
|
|
* for example.
|
|
*/
|
|
#define XLByteToSeg(xlrp, logId, logSeg) \
|
|
( logId = (xlrp).xlogid, \
|
|
logSeg = (xlrp).xrecoff / XLogSegSize \
|
|
)
|
|
#define XLByteToPrevSeg(xlrp, logId, logSeg) \
|
|
( logId = (xlrp).xlogid, \
|
|
logSeg = ((xlrp).xrecoff - 1) / XLogSegSize \
|
|
)
|
|
|
|
/*
|
|
* Is an XLogRecPtr within a particular XLOG segment?
|
|
*
|
|
* For XLByteInSeg, do the computation at face value. For XLByteInPrevSeg,
|
|
* a boundary byte is taken to be in the previous segment.
|
|
*/
|
|
#define XLByteInSeg(xlrp, logId, logSeg) \
|
|
((xlrp).xlogid == (logId) && \
|
|
(xlrp).xrecoff / XLogSegSize == (logSeg))
|
|
|
|
#define XLByteInPrevSeg(xlrp, logId, logSeg) \
|
|
((xlrp).xlogid == (logId) && \
|
|
((xlrp).xrecoff - 1) / XLogSegSize == (logSeg))
|
|
|
|
|
|
#define XLogFileName(path, log, seg) \
|
|
snprintf(path, MAXPGPATH, "%s%c%08X%08X", \
|
|
XLogDir, SEP_CHAR, log, seg)
|
|
|
|
#define XLogTempFileName(path, log, seg) \
|
|
snprintf(path, MAXPGPATH, "%s%cT%08X%08X", \
|
|
XLogDir, SEP_CHAR, log, seg)
|
|
|
|
#define PrevBufIdx(idx) \
|
|
(((idx) == 0) ? XLogCtl->XLogCacheBlck : ((idx) - 1))
|
|
|
|
#define NextBufIdx(idx) \
|
|
(((idx) == XLogCtl->XLogCacheBlck) ? 0 : ((idx) + 1))
|
|
|
|
#define XRecOffIsValid(xrecoff) \
|
|
((xrecoff) % BLCKSZ >= SizeOfXLogPHD && \
|
|
(BLCKSZ - (xrecoff) % BLCKSZ) >= SizeOfXLogRecord)
|
|
|
|
/*
|
|
* _INTL_MAXLOGRECSZ: max space needed for a record including header and
|
|
* any backup-block data.
|
|
*/
|
|
#define _INTL_MAXLOGRECSZ (SizeOfXLogRecord + MAXLOGRECSZ + \
|
|
XLR_MAX_BKP_BLOCKS * (sizeof(BkpBlock) + BLCKSZ))
|
|
|
|
|
|
/* File path names */
|
|
static char XLogDir[MAXPGPATH];
|
|
static char ControlFilePath[MAXPGPATH];
|
|
|
|
/*
|
|
* Private, possibly out-of-date copy of shared LogwrtResult.
|
|
* See discussion above.
|
|
*/
|
|
static XLogwrtResult LogwrtResult = {{0, 0}, {0, 0}};
|
|
|
|
/*
|
|
* openLogFile is -1 or a kernel FD for an open log file segment.
|
|
* When it's open, openLogOff is the current seek offset in the file.
|
|
* openLogId/openLogSeg identify the segment. These variables are only
|
|
* used to write the XLOG, and so will normally refer to the active segment.
|
|
*/
|
|
static int openLogFile = -1;
|
|
static uint32 openLogId = 0;
|
|
static uint32 openLogSeg = 0;
|
|
static uint32 openLogOff = 0;
|
|
|
|
/*
|
|
* These variables are used similarly to the ones above, but for reading
|
|
* the XLOG. Note, however, that readOff generally represents the offset
|
|
* of the page just read, not the seek position of the FD itself, which
|
|
* will be just past that page.
|
|
*/
|
|
static int readFile = -1;
|
|
static uint32 readId = 0;
|
|
static uint32 readSeg = 0;
|
|
static uint32 readOff = 0;
|
|
/* Buffer for currently read page (BLCKSZ bytes) */
|
|
static char *readBuf = NULL;
|
|
/* State information for XLOG reading */
|
|
static XLogRecPtr ReadRecPtr;
|
|
static XLogRecPtr EndRecPtr;
|
|
static XLogRecord *nextRecord = NULL;
|
|
static StartUpID lastReadSUI;
|
|
|
|
static bool InRedo = false;
|
|
|
|
|
|
static bool AdvanceXLInsertBuffer(void);
|
|
static void XLogWrite(XLogwrtRqst WriteRqst);
|
|
static int XLogFileInit(uint32 log, uint32 seg, bool *usexistent);
|
|
static int XLogFileOpen(uint32 log, uint32 seg, bool econt);
|
|
static void PreallocXlogFiles(XLogRecPtr endptr);
|
|
static void MoveOfflineLogs(uint32 log, uint32 seg);
|
|
static XLogRecord *ReadRecord(XLogRecPtr *RecPtr, int emode, char *buffer);
|
|
static bool ValidXLOGHeader(XLogPageHeader hdr, int emode, bool checkSUI);
|
|
static XLogRecord *ReadCheckpointRecord(XLogRecPtr RecPtr,
|
|
const char *whichChkpt,
|
|
char *buffer);
|
|
static void WriteControlFile(void);
|
|
static void ReadControlFile(void);
|
|
static char *str_time(time_t tnow);
|
|
static void xlog_outrec(char *buf, XLogRecord *record);
|
|
static void issue_xlog_fsync(void);
|
|
|
|
|
|
/*
|
|
* Insert an XLOG record having the specified RMID and info bytes,
|
|
* with the body of the record being the data chunk(s) described by
|
|
* the rdata list (see xlog.h for notes about rdata).
|
|
*
|
|
* Returns XLOG pointer to end of record (beginning of next record).
|
|
* This can be used as LSN for data pages affected by the logged action.
|
|
* (LSN is the XLOG point up to which the XLOG must be flushed to disk
|
|
* before the data page can be written out. This implements the basic
|
|
* WAL rule "write the log before the data".)
|
|
*
|
|
* NB: this routine feels free to scribble on the XLogRecData structs,
|
|
* though not on the data they reference. This is OK since the XLogRecData
|
|
* structs are always just temporaries in the calling code.
|
|
*/
|
|
XLogRecPtr
|
|
XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata)
|
|
{
|
|
XLogCtlInsert *Insert = &XLogCtl->Insert;
|
|
XLogRecord *record;
|
|
XLogContRecord *contrecord;
|
|
XLogRecPtr RecPtr;
|
|
XLogRecPtr WriteRqst;
|
|
uint32 freespace;
|
|
uint16 curridx;
|
|
XLogRecData *rdt;
|
|
Buffer dtbuf[XLR_MAX_BKP_BLOCKS];
|
|
bool dtbuf_bkp[XLR_MAX_BKP_BLOCKS];
|
|
BkpBlock dtbuf_xlg[XLR_MAX_BKP_BLOCKS];
|
|
XLogRecPtr dtbuf_lsn[XLR_MAX_BKP_BLOCKS];
|
|
XLogRecData dtbuf_rdt[2 * XLR_MAX_BKP_BLOCKS];
|
|
crc64 rdata_crc;
|
|
uint32 len,
|
|
write_len;
|
|
unsigned i;
|
|
bool do_logwrt;
|
|
bool updrqst;
|
|
bool no_tran = (rmid == RM_XLOG_ID) ? true : false;
|
|
|
|
if (info & XLR_INFO_MASK)
|
|
{
|
|
if ((info & XLR_INFO_MASK) != XLOG_NO_TRAN)
|
|
elog(STOP, "XLogInsert: invalid info mask %02X",
|
|
(info & XLR_INFO_MASK));
|
|
no_tran = true;
|
|
info &= ~XLR_INFO_MASK;
|
|
}
|
|
|
|
/*
|
|
* In bootstrap mode, we don't actually log anything but XLOG resources;
|
|
* return a phony record pointer.
|
|
*/
|
|
if (IsBootstrapProcessingMode() && rmid != RM_XLOG_ID)
|
|
{
|
|
RecPtr.xlogid = 0;
|
|
RecPtr.xrecoff = SizeOfXLogPHD; /* start of 1st checkpoint record */
|
|
return (RecPtr);
|
|
}
|
|
|
|
/*
|
|
* Here we scan the rdata list, determine which buffers must be backed
|
|
* up, and compute the CRC values for the data. Note that the record
|
|
* header isn't added into the CRC yet since we don't know the final
|
|
* length or info bits quite yet.
|
|
*
|
|
* We may have to loop back to here if a race condition is detected below.
|
|
* We could prevent the race by doing all this work while holding the
|
|
* insert spinlock, but it seems better to avoid doing CRC calculations
|
|
* while holding the lock. This means we have to be careful about
|
|
* modifying the rdata list until we know we aren't going to loop back
|
|
* again. The only change we allow ourselves to make earlier is to set
|
|
* rdt->data = NULL in list items we have decided we will have to back
|
|
* up the whole buffer for. This is OK because we will certainly decide
|
|
* the same thing again for those items if we do it over; doing it here
|
|
* saves an extra pass over the list later.
|
|
*/
|
|
begin:;
|
|
for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
|
|
{
|
|
dtbuf[i] = InvalidBuffer;
|
|
dtbuf_bkp[i] = false;
|
|
}
|
|
|
|
INIT_CRC64(rdata_crc);
|
|
len = 0;
|
|
for (rdt = rdata; ; )
|
|
{
|
|
if (rdt->buffer == InvalidBuffer)
|
|
{
|
|
/* Simple data, just include it */
|
|
len += rdt->len;
|
|
COMP_CRC64(rdata_crc, rdt->data, rdt->len);
|
|
}
|
|
else
|
|
{
|
|
/* Find info for buffer */
|
|
for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
|
|
{
|
|
if (rdt->buffer == dtbuf[i])
|
|
{
|
|
/* Buffer already referenced by earlier list item */
|
|
if (dtbuf_bkp[i])
|
|
rdt->data = NULL;
|
|
else if (rdt->data)
|
|
{
|
|
len += rdt->len;
|
|
COMP_CRC64(rdata_crc, rdt->data, rdt->len);
|
|
}
|
|
break;
|
|
}
|
|
if (dtbuf[i] == InvalidBuffer)
|
|
{
|
|
/* OK, put it in this slot */
|
|
dtbuf[i] = rdt->buffer;
|
|
/*
|
|
* XXX We assume page LSN is first data on page
|
|
*/
|
|
dtbuf_lsn[i] = *((XLogRecPtr*)BufferGetBlock(rdt->buffer));
|
|
if (XLByteLE(dtbuf_lsn[i], RedoRecPtr))
|
|
{
|
|
crc64 dtcrc;
|
|
|
|
dtbuf_bkp[i] = true;
|
|
rdt->data = NULL;
|
|
INIT_CRC64(dtcrc);
|
|
COMP_CRC64(dtcrc,
|
|
BufferGetBlock(dtbuf[i]),
|
|
BLCKSZ);
|
|
dtbuf_xlg[i].node = BufferGetFileNode(dtbuf[i]);
|
|
dtbuf_xlg[i].block = BufferGetBlockNumber(dtbuf[i]);
|
|
COMP_CRC64(dtcrc,
|
|
(char*) &(dtbuf_xlg[i]) + sizeof(crc64),
|
|
sizeof(BkpBlock) - sizeof(crc64));
|
|
FIN_CRC64(dtcrc);
|
|
dtbuf_xlg[i].crc = dtcrc;
|
|
}
|
|
else if (rdt->data)
|
|
{
|
|
len += rdt->len;
|
|
COMP_CRC64(rdata_crc, rdt->data, rdt->len);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (i >= XLR_MAX_BKP_BLOCKS)
|
|
elog(STOP, "XLogInsert: can backup %d blocks at most",
|
|
XLR_MAX_BKP_BLOCKS);
|
|
}
|
|
/* Break out of loop when rdt points to last list item */
|
|
if (rdt->next == NULL)
|
|
break;
|
|
rdt = rdt->next;
|
|
}
|
|
|
|
/*
|
|
* NOTE: the test for len == 0 here is somewhat fishy, since in theory
|
|
* all of the rmgr data might have been suppressed in favor of backup
|
|
* blocks. Currently, all callers of XLogInsert provide at least some
|
|
* not-in-a-buffer data and so len == 0 should never happen, but that
|
|
* may not be true forever. If you need to remove the len == 0 check,
|
|
* also remove the check for xl_len == 0 in ReadRecord, below.
|
|
*/
|
|
if (len == 0 || len > MAXLOGRECSZ)
|
|
elog(STOP, "XLogInsert: invalid record len %u", len);
|
|
|
|
START_CRIT_SECTION();
|
|
|
|
/* wait to obtain xlog insert lock */
|
|
do_logwrt = true;
|
|
|
|
for (i = 0;;)
|
|
{
|
|
/* try to update LogwrtResult while waiting for insert lock */
|
|
if (!TAS(&(XLogCtl->info_lck)))
|
|
{
|
|
XLogwrtRqst LogwrtRqst;
|
|
|
|
LogwrtRqst = XLogCtl->LogwrtRqst;
|
|
LogwrtResult = XLogCtl->LogwrtResult;
|
|
S_UNLOCK(&(XLogCtl->info_lck));
|
|
|
|
/*
|
|
* If cache is half filled then try to acquire logwrt lock
|
|
* and do LOGWRT work, but only once per XLogInsert call.
|
|
* Ignore any fractional blocks in performing this check.
|
|
*/
|
|
LogwrtRqst.Write.xrecoff -= LogwrtRqst.Write.xrecoff % BLCKSZ;
|
|
if (do_logwrt &&
|
|
(LogwrtRqst.Write.xlogid != LogwrtResult.Write.xlogid ||
|
|
(LogwrtRqst.Write.xrecoff >= LogwrtResult.Write.xrecoff +
|
|
XLogCtl->XLogCacheByte / 2)))
|
|
{
|
|
if (!TAS(&(XLogCtl->logwrt_lck)))
|
|
{
|
|
LogwrtResult = XLogCtl->Write.LogwrtResult;
|
|
if (XLByteLT(LogwrtResult.Write, LogwrtRqst.Write))
|
|
{
|
|
XLogWrite(LogwrtRqst);
|
|
do_logwrt = false;
|
|
}
|
|
S_UNLOCK(&(XLogCtl->logwrt_lck));
|
|
}
|
|
}
|
|
}
|
|
if (!TAS(&(XLogCtl->insert_lck)))
|
|
break;
|
|
S_LOCK_SLEEP(&(XLogCtl->insert_lck), i++, XLOG_LOCK_TIMEOUT);
|
|
}
|
|
|
|
/*
|
|
* Check to see if my RedoRecPtr is out of date. If so, may have to
|
|
* go back and recompute everything. This can only happen just after a
|
|
* checkpoint, so it's better to be slow in this case and fast otherwise.
|
|
*/
|
|
if (!XLByteEQ(RedoRecPtr, Insert->RedoRecPtr))
|
|
{
|
|
Assert(XLByteLT(RedoRecPtr, Insert->RedoRecPtr));
|
|
RedoRecPtr = Insert->RedoRecPtr;
|
|
|
|
for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
|
|
{
|
|
if (dtbuf[i] == InvalidBuffer)
|
|
continue;
|
|
if (dtbuf_bkp[i] == false &&
|
|
XLByteLE(dtbuf_lsn[i], RedoRecPtr))
|
|
{
|
|
/*
|
|
* Oops, this buffer now needs to be backed up, but we didn't
|
|
* think so above. Start over.
|
|
*/
|
|
S_UNLOCK(&(XLogCtl->insert_lck));
|
|
END_CRIT_SECTION();
|
|
goto begin;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make additional rdata list entries for the backup blocks, so that
|
|
* we don't need to special-case them in the write loop. Note that we
|
|
* have now irrevocably changed the input rdata list. At the exit of
|
|
* this loop, write_len includes the backup block data.
|
|
*
|
|
* Also set the appropriate info bits to show which buffers were backed
|
|
* up. The i'th XLR_SET_BKP_BLOCK bit corresponds to the i'th distinct
|
|
* buffer value (ignoring InvalidBuffer) appearing in the rdata list.
|
|
*/
|
|
write_len = len;
|
|
for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
|
|
{
|
|
if (dtbuf[i] == InvalidBuffer || !(dtbuf_bkp[i]))
|
|
continue;
|
|
|
|
info |= XLR_SET_BKP_BLOCK(i);
|
|
|
|
rdt->next = &(dtbuf_rdt[2 * i]);
|
|
|
|
dtbuf_rdt[2 * i].data = (char*) &(dtbuf_xlg[i]);
|
|
dtbuf_rdt[2 * i].len = sizeof(BkpBlock);
|
|
write_len += sizeof(BkpBlock);
|
|
|
|
rdt = dtbuf_rdt[2 * i].next = &(dtbuf_rdt[2 * i + 1]);
|
|
|
|
dtbuf_rdt[2 * i + 1].data = (char*) BufferGetBlock(dtbuf[i]);
|
|
dtbuf_rdt[2 * i + 1].len = BLCKSZ;
|
|
write_len += BLCKSZ;
|
|
dtbuf_rdt[2 * i + 1].next = NULL;
|
|
}
|
|
|
|
/* Insert record header */
|
|
|
|
updrqst = false;
|
|
freespace = INSERT_FREESPACE(Insert);
|
|
if (freespace < SizeOfXLogRecord)
|
|
{
|
|
updrqst = AdvanceXLInsertBuffer();
|
|
freespace = BLCKSZ - SizeOfXLogPHD;
|
|
}
|
|
|
|
curridx = Insert->curridx;
|
|
record = (XLogRecord *) Insert->currpos;
|
|
|
|
record->xl_prev = Insert->PrevRecord;
|
|
if (no_tran)
|
|
{
|
|
record->xl_xact_prev.xlogid = 0;
|
|
record->xl_xact_prev.xrecoff = 0;
|
|
}
|
|
else
|
|
record->xl_xact_prev = MyLastRecPtr;
|
|
|
|
record->xl_xid = GetCurrentTransactionId();
|
|
record->xl_len = len; /* doesn't include backup blocks */
|
|
record->xl_info = info;
|
|
record->xl_rmid = rmid;
|
|
|
|
/* Now we can finish computing the main CRC */
|
|
COMP_CRC64(rdata_crc, (char*) record + sizeof(crc64),
|
|
SizeOfXLogRecord - sizeof(crc64));
|
|
FIN_CRC64(rdata_crc);
|
|
record->xl_crc = rdata_crc;
|
|
|
|
/* Compute record's XLOG location */
|
|
INSERT_RECPTR(RecPtr, Insert, curridx);
|
|
|
|
/* If first XLOG record of transaction, save it in PROC array */
|
|
if (MyLastRecPtr.xrecoff == 0 && !no_tran)
|
|
{
|
|
SpinAcquire(SInvalLock);
|
|
MyProc->logRec = RecPtr;
|
|
SpinRelease(SInvalLock);
|
|
}
|
|
|
|
if (XLOG_DEBUG)
|
|
{
|
|
char buf[8192];
|
|
|
|
sprintf(buf, "INSERT @ %u/%u: ", RecPtr.xlogid, RecPtr.xrecoff);
|
|
xlog_outrec(buf, record);
|
|
if (rdata->data != NULL)
|
|
{
|
|
strcat(buf, " - ");
|
|
RmgrTable[record->xl_rmid].rm_desc(buf, record->xl_info, rdata->data);
|
|
}
|
|
fprintf(stderr, "%s\n", buf);
|
|
}
|
|
|
|
/* Record begin of record in appropriate places */
|
|
if (!no_tran)
|
|
MyLastRecPtr = RecPtr;
|
|
ProcLastRecPtr = RecPtr;
|
|
Insert->PrevRecord = RecPtr;
|
|
|
|
Insert->currpos += SizeOfXLogRecord;
|
|
freespace -= SizeOfXLogRecord;
|
|
|
|
/*
|
|
* Append the data, including backup blocks if any
|
|
*/
|
|
while (write_len)
|
|
{
|
|
while (rdata->data == NULL)
|
|
rdata = rdata->next;
|
|
|
|
if (freespace > 0)
|
|
{
|
|
if (rdata->len > freespace)
|
|
{
|
|
memcpy(Insert->currpos, rdata->data, freespace);
|
|
rdata->data += freespace;
|
|
rdata->len -= freespace;
|
|
write_len -= freespace;
|
|
}
|
|
else
|
|
{
|
|
memcpy(Insert->currpos, rdata->data, rdata->len);
|
|
freespace -= rdata->len;
|
|
write_len -= rdata->len;
|
|
Insert->currpos += rdata->len;
|
|
rdata = rdata->next;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Use next buffer */
|
|
updrqst = AdvanceXLInsertBuffer();
|
|
curridx = Insert->curridx;
|
|
/* Insert cont-record header */
|
|
Insert->currpage->xlp_info |= XLP_FIRST_IS_CONTRECORD;
|
|
contrecord = (XLogContRecord *) Insert->currpos;
|
|
contrecord->xl_rem_len = write_len;
|
|
Insert->currpos += SizeOfXLogContRecord;
|
|
freespace = BLCKSZ - SizeOfXLogPHD - SizeOfXLogContRecord;
|
|
}
|
|
|
|
/* Ensure next record will be properly aligned */
|
|
Insert->currpos = (char *) Insert->currpage +
|
|
MAXALIGN(Insert->currpos - (char *) Insert->currpage);
|
|
freespace = INSERT_FREESPACE(Insert);
|
|
|
|
/*
|
|
* The recptr I return is the beginning of the *next* record.
|
|
* This will be stored as LSN for changed data pages...
|
|
*/
|
|
INSERT_RECPTR(RecPtr, Insert, curridx);
|
|
|
|
/* Need to update shared LogwrtRqst if some block was filled up */
|
|
if (freespace < SizeOfXLogRecord)
|
|
updrqst = true; /* curridx is filled and available for writing out */
|
|
else
|
|
curridx = PrevBufIdx(curridx);
|
|
WriteRqst = XLogCtl->xlblocks[curridx];
|
|
|
|
S_UNLOCK(&(XLogCtl->insert_lck));
|
|
|
|
if (updrqst)
|
|
{
|
|
S_LOCK(&(XLogCtl->info_lck));
|
|
/* advance global request to include new block(s) */
|
|
if (XLByteLT(XLogCtl->LogwrtRqst.Write, WriteRqst))
|
|
XLogCtl->LogwrtRqst.Write = WriteRqst;
|
|
/* update local result copy while I have the chance */
|
|
LogwrtResult = XLogCtl->LogwrtResult;
|
|
S_UNLOCK(&(XLogCtl->info_lck));
|
|
}
|
|
|
|
END_CRIT_SECTION();
|
|
return (RecPtr);
|
|
}
|
|
|
|
/*
|
|
* Advance the Insert state to the next buffer page, writing out the next
|
|
* buffer if it still contains unwritten data.
|
|
*
|
|
* The global LogwrtRqst.Write pointer needs to be advanced to include the
|
|
* just-filled page. If we can do this for free (without an extra spinlock),
|
|
* we do so here. Otherwise the caller must do it. We return TRUE if the
|
|
* request update still needs to be done, FALSE if we did it internally.
|
|
*
|
|
* Must be called with insert_lck held.
|
|
*/
|
|
static bool
|
|
AdvanceXLInsertBuffer(void)
|
|
{
|
|
XLogCtlInsert *Insert = &XLogCtl->Insert;
|
|
XLogCtlWrite *Write = &XLogCtl->Write;
|
|
uint16 nextidx = NextBufIdx(Insert->curridx);
|
|
bool update_needed = true;
|
|
XLogRecPtr OldPageRqstPtr;
|
|
XLogwrtRqst WriteRqst;
|
|
|
|
/* Use Insert->LogwrtResult copy if it's more fresh */
|
|
if (XLByteLT(LogwrtResult.Write, Insert->LogwrtResult.Write))
|
|
LogwrtResult = Insert->LogwrtResult;
|
|
|
|
/*
|
|
* Get ending-offset of the buffer page we need to replace (this may be
|
|
* zero if the buffer hasn't been used yet). Fall through if it's already
|
|
* written out.
|
|
*/
|
|
OldPageRqstPtr = XLogCtl->xlblocks[nextidx];
|
|
if (!XLByteLE(OldPageRqstPtr, LogwrtResult.Write))
|
|
{
|
|
/* nope, got work to do... */
|
|
unsigned spins = 0;
|
|
XLogRecPtr FinishedPageRqstPtr;
|
|
|
|
FinishedPageRqstPtr = XLogCtl->xlblocks[Insert->curridx];
|
|
|
|
for (;;)
|
|
{
|
|
/* While waiting, try to get info_lck and update LogwrtResult */
|
|
if (!TAS(&(XLogCtl->info_lck)))
|
|
{
|
|
if (XLByteLT(XLogCtl->LogwrtRqst.Write, FinishedPageRqstPtr))
|
|
XLogCtl->LogwrtRqst.Write = FinishedPageRqstPtr;
|
|
update_needed = false; /* Did the shared-request update */
|
|
LogwrtResult = XLogCtl->LogwrtResult;
|
|
S_UNLOCK(&(XLogCtl->info_lck));
|
|
|
|
if (XLByteLE(OldPageRqstPtr, LogwrtResult.Write))
|
|
{
|
|
/* OK, someone wrote it already */
|
|
Insert->LogwrtResult = LogwrtResult;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* LogwrtResult lock is busy or we know the page is still dirty.
|
|
* Try to acquire logwrt lock and write full blocks.
|
|
*/
|
|
if (!TAS(&(XLogCtl->logwrt_lck)))
|
|
{
|
|
LogwrtResult = Write->LogwrtResult;
|
|
if (XLByteLE(OldPageRqstPtr, LogwrtResult.Write))
|
|
{
|
|
S_UNLOCK(&(XLogCtl->logwrt_lck));
|
|
/* OK, someone wrote it already */
|
|
Insert->LogwrtResult = LogwrtResult;
|
|
break;
|
|
}
|
|
/*
|
|
* Have to write buffers while holding insert lock.
|
|
* This is not good, so only write as much as we absolutely
|
|
* must.
|
|
*/
|
|
WriteRqst.Write = OldPageRqstPtr;
|
|
WriteRqst.Flush.xlogid = 0;
|
|
WriteRqst.Flush.xrecoff = 0;
|
|
XLogWrite(WriteRqst);
|
|
S_UNLOCK(&(XLogCtl->logwrt_lck));
|
|
Insert->LogwrtResult = LogwrtResult;
|
|
break;
|
|
}
|
|
S_LOCK_SLEEP(&(XLogCtl->logwrt_lck), spins++, XLOG_LOCK_TIMEOUT);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now the next buffer slot is free and we can set it up to be the
|
|
* next output page.
|
|
*/
|
|
if (XLogCtl->xlblocks[Insert->curridx].xrecoff >= XLogFileSize)
|
|
{
|
|
/* crossing a logid boundary */
|
|
XLogCtl->xlblocks[nextidx].xlogid =
|
|
XLogCtl->xlblocks[Insert->curridx].xlogid + 1;
|
|
XLogCtl->xlblocks[nextidx].xrecoff = BLCKSZ;
|
|
}
|
|
else
|
|
{
|
|
XLogCtl->xlblocks[nextidx].xlogid =
|
|
XLogCtl->xlblocks[Insert->curridx].xlogid;
|
|
XLogCtl->xlblocks[nextidx].xrecoff =
|
|
XLogCtl->xlblocks[Insert->curridx].xrecoff + BLCKSZ;
|
|
}
|
|
Insert->curridx = nextidx;
|
|
Insert->currpage = (XLogPageHeader) (XLogCtl->pages + nextidx * BLCKSZ);
|
|
Insert->currpos = ((char*) Insert->currpage) + SizeOfXLogPHD;
|
|
/*
|
|
* Be sure to re-zero the buffer so that bytes beyond what we've written
|
|
* will look like zeroes and not valid XLOG records...
|
|
*/
|
|
MemSet((char*) Insert->currpage, 0, BLCKSZ);
|
|
Insert->currpage->xlp_magic = XLOG_PAGE_MAGIC;
|
|
/* Insert->currpage->xlp_info = 0; */ /* done by memset */
|
|
Insert->currpage->xlp_sui = ThisStartUpID;
|
|
|
|
return update_needed;
|
|
}
|
|
|
|
/*
|
|
* Write and/or fsync the log at least as far as WriteRqst indicates.
|
|
*
|
|
* Must be called with logwrt_lck held.
|
|
*/
|
|
static void
|
|
XLogWrite(XLogwrtRqst WriteRqst)
|
|
{
|
|
XLogCtlWrite *Write = &XLogCtl->Write;
|
|
char *from;
|
|
bool ispartialpage;
|
|
bool usexistent;
|
|
|
|
/* Update local LogwrtResult (caller probably did this already, but...) */
|
|
LogwrtResult = Write->LogwrtResult;
|
|
|
|
while (XLByteLT(LogwrtResult.Write, WriteRqst.Write))
|
|
{
|
|
/*
|
|
* Make sure we're not ahead of the insert process. This could
|
|
* happen if we're passed a bogus WriteRqst.Write that is past the
|
|
* end of the last page that's been initialized by
|
|
* AdvanceXLInsertBuffer.
|
|
*/
|
|
if (!XLByteLT(LogwrtResult.Write, XLogCtl->xlblocks[Write->curridx]))
|
|
elog(STOP, "XLogWrite: write request is past end of log");
|
|
|
|
/* Advance LogwrtResult.Write to end of current buffer page */
|
|
LogwrtResult.Write = XLogCtl->xlblocks[Write->curridx];
|
|
ispartialpage = XLByteLT(WriteRqst.Write, LogwrtResult.Write);
|
|
|
|
if (!XLByteInPrevSeg(LogwrtResult.Write, openLogId, openLogSeg))
|
|
{
|
|
/*
|
|
* Switch to new logfile segment.
|
|
*/
|
|
if (openLogFile >= 0)
|
|
{
|
|
if (close(openLogFile) != 0)
|
|
elog(STOP, "close(logfile %u seg %u) failed: %m",
|
|
openLogId, openLogSeg);
|
|
openLogFile = -1;
|
|
}
|
|
XLByteToPrevSeg(LogwrtResult.Write, openLogId, openLogSeg);
|
|
|
|
/* create/use new log file; need lock in case creating */
|
|
SpinAcquire(ControlFileLockId);
|
|
usexistent = true;
|
|
openLogFile = XLogFileInit(openLogId, openLogSeg, &usexistent);
|
|
openLogOff = 0;
|
|
/* update pg_control, unless someone else already did */
|
|
if (ControlFile->logId != openLogId ||
|
|
ControlFile->logSeg != openLogSeg + 1)
|
|
{
|
|
ControlFile->logId = openLogId;
|
|
ControlFile->logSeg = openLogSeg + 1;
|
|
ControlFile->time = time(NULL);
|
|
UpdateControlFile();
|
|
}
|
|
SpinRelease(ControlFileLockId);
|
|
|
|
if (!usexistent) /* there was no precreated file */
|
|
elog(LOG, "XLogWrite: new log file created - "
|
|
"consider increasing WAL_FILES");
|
|
|
|
/*
|
|
* Signal postmaster to start a checkpoint if it's been too
|
|
* long since the last one. (We look at local copy of RedoRecPtr
|
|
* which might be a little out of date, but should be close enough
|
|
* for this purpose.)
|
|
*/
|
|
if (IsUnderPostmaster &&
|
|
(openLogId != RedoRecPtr.xlogid ||
|
|
openLogSeg >= (RedoRecPtr.xrecoff / XLogSegSize) +
|
|
(uint32) CheckPointSegments))
|
|
{
|
|
if (XLOG_DEBUG)
|
|
fprintf(stderr, "XLogWrite: time for a checkpoint, signaling postmaster\n");
|
|
kill(getppid(), SIGUSR1);
|
|
}
|
|
}
|
|
|
|
if (openLogFile < 0)
|
|
{
|
|
XLByteToPrevSeg(LogwrtResult.Write, openLogId, openLogSeg);
|
|
openLogFile = XLogFileOpen(openLogId, openLogSeg, false);
|
|
openLogOff = 0;
|
|
}
|
|
|
|
/* Need to seek in the file? */
|
|
if (openLogOff != (LogwrtResult.Write.xrecoff - BLCKSZ) % XLogSegSize)
|
|
{
|
|
openLogOff = (LogwrtResult.Write.xrecoff - BLCKSZ) % XLogSegSize;
|
|
if (lseek(openLogFile, (off_t) openLogOff, SEEK_SET) < 0)
|
|
elog(STOP, "lseek(logfile %u seg %u off %u) failed: %m",
|
|
openLogId, openLogSeg, openLogOff);
|
|
}
|
|
|
|
/* OK to write the page */
|
|
from = XLogCtl->pages + Write->curridx * BLCKSZ;
|
|
if (write(openLogFile, from, BLCKSZ) != BLCKSZ)
|
|
elog(STOP, "write(logfile %u seg %u off %u) failed: %m",
|
|
openLogId, openLogSeg, openLogOff);
|
|
openLogOff += BLCKSZ;
|
|
|
|
/*
|
|
* If we just wrote the whole last page of a logfile segment,
|
|
* fsync the segment immediately. This avoids having to go back
|
|
* and re-open prior segments when an fsync request comes along later.
|
|
* Doing it here ensures that one and only one backend will perform
|
|
* this fsync.
|
|
*/
|
|
if (openLogOff >= XLogSegSize && !ispartialpage)
|
|
{
|
|
issue_xlog_fsync();
|
|
LogwrtResult.Flush = LogwrtResult.Write; /* end of current page */
|
|
}
|
|
|
|
if (ispartialpage)
|
|
{
|
|
/* Only asked to write a partial page */
|
|
LogwrtResult.Write = WriteRqst.Write;
|
|
break;
|
|
}
|
|
Write->curridx = NextBufIdx(Write->curridx);
|
|
}
|
|
|
|
/*
|
|
* If asked to flush, do so
|
|
*/
|
|
if (XLByteLT(LogwrtResult.Flush, WriteRqst.Flush) &&
|
|
XLByteLT(LogwrtResult.Flush, LogwrtResult.Write))
|
|
{
|
|
/*
|
|
* Could get here without iterating above loop, in which case
|
|
* we might have no open file or the wrong one. However, we do
|
|
* not need to fsync more than one file.
|
|
*/
|
|
if (sync_method != SYNC_METHOD_OPEN)
|
|
{
|
|
if (openLogFile >= 0 &&
|
|
!XLByteInPrevSeg(LogwrtResult.Write, openLogId, openLogSeg))
|
|
{
|
|
if (close(openLogFile) != 0)
|
|
elog(STOP, "close(logfile %u seg %u) failed: %m",
|
|
openLogId, openLogSeg);
|
|
openLogFile = -1;
|
|
}
|
|
if (openLogFile < 0)
|
|
{
|
|
XLByteToPrevSeg(LogwrtResult.Write, openLogId, openLogSeg);
|
|
openLogFile = XLogFileOpen(openLogId, openLogSeg, false);
|
|
openLogOff = 0;
|
|
}
|
|
issue_xlog_fsync();
|
|
}
|
|
LogwrtResult.Flush = LogwrtResult.Write;
|
|
}
|
|
|
|
/*
|
|
* Update shared-memory status
|
|
*
|
|
* We make sure that the shared 'request' values do not fall behind
|
|
* the 'result' values. This is not absolutely essential, but it saves
|
|
* some code in a couple of places.
|
|
*/
|
|
S_LOCK(&(XLogCtl->info_lck));
|
|
XLogCtl->LogwrtResult = LogwrtResult;
|
|
if (XLByteLT(XLogCtl->LogwrtRqst.Write, LogwrtResult.Write))
|
|
XLogCtl->LogwrtRqst.Write = LogwrtResult.Write;
|
|
if (XLByteLT(XLogCtl->LogwrtRqst.Flush, LogwrtResult.Flush))
|
|
XLogCtl->LogwrtRqst.Flush = LogwrtResult.Flush;
|
|
S_UNLOCK(&(XLogCtl->info_lck));
|
|
|
|
Write->LogwrtResult = LogwrtResult;
|
|
}
|
|
|
|
/*
|
|
* Ensure that all XLOG data through the given position is flushed to disk.
|
|
*
|
|
* NOTE: this differs from XLogWrite mainly in that the logwrt_lck is not
|
|
* already held, and we try to avoid acquiring it if possible.
|
|
*/
|
|
void
|
|
XLogFlush(XLogRecPtr record)
|
|
{
|
|
XLogRecPtr WriteRqstPtr;
|
|
XLogwrtRqst WriteRqst;
|
|
unsigned spins = 0;
|
|
|
|
if (XLOG_DEBUG)
|
|
{
|
|
fprintf(stderr, "XLogFlush%s%s: rqst %u/%u; wrt %u/%u; flsh %u/%u\n",
|
|
(IsBootstrapProcessingMode()) ? "(bootstrap)" : "",
|
|
(InRedo) ? "(redo)" : "",
|
|
record.xlogid, record.xrecoff,
|
|
LogwrtResult.Write.xlogid, LogwrtResult.Write.xrecoff,
|
|
LogwrtResult.Flush.xlogid, LogwrtResult.Flush.xrecoff);
|
|
fflush(stderr);
|
|
}
|
|
|
|
/* Disabled during REDO */
|
|
if (InRedo)
|
|
return;
|
|
|
|
/* Quick exit if already known flushed */
|
|
if (XLByteLE(record, LogwrtResult.Flush))
|
|
return;
|
|
|
|
START_CRIT_SECTION();
|
|
|
|
/*
|
|
* Since fsync is usually a horribly expensive operation, we try to
|
|
* piggyback as much data as we can on each fsync: if we see any more
|
|
* data entered into the xlog buffer, we'll write and fsync that too,
|
|
* so that the final value of LogwrtResult.Flush is as large as possible.
|
|
* This gives us some chance of avoiding another fsync immediately after.
|
|
*/
|
|
|
|
/* initialize to given target; may increase below */
|
|
WriteRqstPtr = record;
|
|
|
|
for (;;)
|
|
{
|
|
/* try to read LogwrtResult and update local state */
|
|
if (!TAS(&(XLogCtl->info_lck)))
|
|
{
|
|
if (XLByteLT(WriteRqstPtr, XLogCtl->LogwrtRqst.Write))
|
|
WriteRqstPtr = XLogCtl->LogwrtRqst.Write;
|
|
LogwrtResult = XLogCtl->LogwrtResult;
|
|
S_UNLOCK(&(XLogCtl->info_lck));
|
|
if (XLByteLE(record, LogwrtResult.Flush))
|
|
{
|
|
/* Done already */
|
|
break;
|
|
}
|
|
}
|
|
/* if something was added to log cache then try to flush this too */
|
|
if (!TAS(&(XLogCtl->insert_lck)))
|
|
{
|
|
XLogCtlInsert *Insert = &XLogCtl->Insert;
|
|
uint32 freespace = INSERT_FREESPACE(Insert);
|
|
|
|
if (freespace < SizeOfXLogRecord) /* buffer is full */
|
|
{
|
|
WriteRqstPtr = XLogCtl->xlblocks[Insert->curridx];
|
|
}
|
|
else
|
|
{
|
|
WriteRqstPtr = XLogCtl->xlblocks[Insert->curridx];
|
|
WriteRqstPtr.xrecoff -= freespace;
|
|
}
|
|
S_UNLOCK(&(XLogCtl->insert_lck));
|
|
}
|
|
/* now try to get the logwrt lock */
|
|
if (!TAS(&(XLogCtl->logwrt_lck)))
|
|
{
|
|
LogwrtResult = XLogCtl->Write.LogwrtResult;
|
|
if (XLByteLE(record, LogwrtResult.Flush))
|
|
{
|
|
/* Done already */
|
|
S_UNLOCK(&(XLogCtl->logwrt_lck));
|
|
break;
|
|
}
|
|
WriteRqst.Write = WriteRqstPtr;
|
|
WriteRqst.Flush = record;
|
|
XLogWrite(WriteRqst);
|
|
S_UNLOCK(&(XLogCtl->logwrt_lck));
|
|
if (XLByteLT(LogwrtResult.Flush, record))
|
|
elog(STOP, "XLogFlush: request is not satisfied");
|
|
break;
|
|
}
|
|
S_LOCK_SLEEP(&(XLogCtl->logwrt_lck), spins++, XLOG_LOCK_TIMEOUT);
|
|
}
|
|
|
|
END_CRIT_SECTION();
|
|
}
|
|
|
|
/*
|
|
* Create a new XLOG file segment, or open a pre-existing one.
|
|
*
|
|
* Returns FD of opened file.
|
|
*/
|
|
static int
|
|
XLogFileInit(uint32 log, uint32 seg, bool *usexistent)
|
|
{
|
|
char path[MAXPGPATH];
|
|
char tpath[MAXPGPATH];
|
|
char zbuffer[BLCKSZ];
|
|
int fd;
|
|
int nbytes;
|
|
|
|
XLogFileName(path, log, seg);
|
|
|
|
/*
|
|
* Try to use existent file (checkpoint maker may have created it already)
|
|
*/
|
|
if (*usexistent)
|
|
{
|
|
fd = BasicOpenFile(path, O_RDWR | PG_BINARY | XLOG_SYNC_BIT,
|
|
S_IRUSR | S_IWUSR);
|
|
if (fd < 0)
|
|
{
|
|
if (errno != ENOENT)
|
|
elog(STOP, "InitOpen(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
}
|
|
else
|
|
return(fd);
|
|
/* Set flag to tell caller there was no existent file */
|
|
*usexistent = false;
|
|
}
|
|
|
|
XLogTempFileName(tpath, log, seg);
|
|
unlink(tpath);
|
|
unlink(path);
|
|
|
|
/* do not use XLOG_SYNC_BIT here --- want to fsync only at end of fill */
|
|
fd = BasicOpenFile(tpath, O_RDWR | O_CREAT | O_EXCL | PG_BINARY,
|
|
S_IRUSR | S_IWUSR);
|
|
if (fd < 0)
|
|
elog(STOP, "InitCreate(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
|
|
/*
|
|
* Zero-fill the file. We have to do this the hard way to ensure that
|
|
* all the file space has really been allocated --- on platforms that
|
|
* allow "holes" in files, just seeking to the end doesn't allocate
|
|
* intermediate space. This way, we know that we have all the space
|
|
* and (after the fsync below) that all the indirect blocks are down
|
|
* on disk. Therefore, fdatasync(2) or O_DSYNC will be sufficient to
|
|
* sync future writes to the log file.
|
|
*/
|
|
MemSet(zbuffer, 0, sizeof(zbuffer));
|
|
for (nbytes = 0; nbytes < XLogSegSize; nbytes += sizeof(zbuffer))
|
|
{
|
|
if ((int) write(fd, zbuffer, sizeof(zbuffer)) != (int) sizeof(zbuffer))
|
|
{
|
|
int save_errno = errno;
|
|
|
|
/* If we fail to make the file, delete it to release disk space */
|
|
unlink(tpath);
|
|
errno = save_errno;
|
|
|
|
elog(STOP, "ZeroFill(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
}
|
|
}
|
|
|
|
if (pg_fsync(fd) != 0)
|
|
elog(STOP, "fsync(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
|
|
close(fd);
|
|
|
|
/*
|
|
* Prefer link() to rename() here just to be sure that we don't overwrite
|
|
* an existing logfile. However, there shouldn't be one, so rename()
|
|
* is an acceptable substitute except for the truly paranoid.
|
|
*/
|
|
#ifndef __BEOS__
|
|
if (link(tpath, path) < 0)
|
|
elog(STOP, "InitRelink(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
unlink(tpath);
|
|
#else
|
|
if (rename(tpath, path) < 0)
|
|
elog(STOP, "InitRelink(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
#endif
|
|
|
|
fd = BasicOpenFile(path, O_RDWR | PG_BINARY | XLOG_SYNC_BIT,
|
|
S_IRUSR | S_IWUSR);
|
|
if (fd < 0)
|
|
elog(STOP, "InitReopen(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
|
|
return (fd);
|
|
}
|
|
|
|
/*
|
|
* Open a pre-existing logfile segment.
|
|
*/
|
|
static int
|
|
XLogFileOpen(uint32 log, uint32 seg, bool econt)
|
|
{
|
|
char path[MAXPGPATH];
|
|
int fd;
|
|
|
|
XLogFileName(path, log, seg);
|
|
|
|
fd = BasicOpenFile(path, O_RDWR | PG_BINARY | XLOG_SYNC_BIT,
|
|
S_IRUSR | S_IWUSR);
|
|
if (fd < 0)
|
|
{
|
|
if (econt && errno == ENOENT)
|
|
{
|
|
elog(LOG, "open(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
return (fd);
|
|
}
|
|
elog(STOP, "open(logfile %u seg %u) failed: %m",
|
|
log, seg);
|
|
}
|
|
|
|
return (fd);
|
|
}
|
|
|
|
/*
|
|
* Preallocate log files beyond the specified log endpoint, according to
|
|
* the XLOGfile user parameter.
|
|
*/
|
|
static void
|
|
PreallocXlogFiles(XLogRecPtr endptr)
|
|
{
|
|
uint32 _logId;
|
|
uint32 _logSeg;
|
|
int lf;
|
|
bool usexistent;
|
|
struct timeval delay;
|
|
int i;
|
|
|
|
XLByteToPrevSeg(endptr, _logId, _logSeg);
|
|
if (XLOGfiles > 0)
|
|
{
|
|
for (i = 1; i <= XLOGfiles; i++)
|
|
{
|
|
usexistent = true;
|
|
NextLogSeg(_logId, _logSeg);
|
|
SpinAcquire(ControlFileLockId);
|
|
lf = XLogFileInit(_logId, _logSeg, &usexistent);
|
|
close(lf);
|
|
SpinRelease(ControlFileLockId);
|
|
/*
|
|
* Give up ControlFileLockId for 1/50 sec to let other
|
|
* backends switch to new log file in XLogWrite()
|
|
*/
|
|
delay.tv_sec = 0;
|
|
delay.tv_usec = 20000;
|
|
(void) select(0, NULL, NULL, NULL, &delay);
|
|
}
|
|
}
|
|
else if ((endptr.xrecoff - 1) % XLogSegSize >=
|
|
(uint32) (0.75 * XLogSegSize))
|
|
{
|
|
usexistent = true;
|
|
NextLogSeg(_logId, _logSeg);
|
|
SpinAcquire(ControlFileLockId);
|
|
lf = XLogFileInit(_logId, _logSeg, &usexistent);
|
|
close(lf);
|
|
SpinRelease(ControlFileLockId);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove or move offline all log files older or equal to passed log/seg#
|
|
*/
|
|
static void
|
|
MoveOfflineLogs(uint32 log, uint32 seg)
|
|
{
|
|
DIR *xldir;
|
|
struct dirent *xlde;
|
|
char lastoff[32];
|
|
char path[MAXPGPATH];
|
|
|
|
Assert(XLOG_archive_dir[0] == 0); /* ! implemented yet */
|
|
|
|
xldir = opendir(XLogDir);
|
|
if (xldir == NULL)
|
|
elog(STOP, "MoveOfflineLogs: cannot open xlog dir: %m");
|
|
|
|
sprintf(lastoff, "%08X%08X", log, seg);
|
|
|
|
errno = 0;
|
|
while ((xlde = readdir(xldir)) != NULL)
|
|
{
|
|
if (strlen(xlde->d_name) == 16 &&
|
|
strspn(xlde->d_name, "0123456789ABCDEF") == 16 &&
|
|
strcmp(xlde->d_name, lastoff) <= 0)
|
|
{
|
|
elog(LOG, "MoveOfflineLogs: %s %s", (XLOG_archive_dir[0]) ?
|
|
"archive" : "remove", xlde->d_name);
|
|
sprintf(path, "%s%c%s", XLogDir, SEP_CHAR, xlde->d_name);
|
|
if (XLOG_archive_dir[0] == 0)
|
|
unlink(path);
|
|
}
|
|
errno = 0;
|
|
}
|
|
if (errno)
|
|
elog(STOP, "MoveOfflineLogs: cannot read xlog dir: %m");
|
|
closedir(xldir);
|
|
}
|
|
|
|
/*
|
|
* Restore the backup blocks present in an XLOG record, if any.
|
|
*
|
|
* We assume all of the record has been read into memory at *record.
|
|
*/
|
|
static void
|
|
RestoreBkpBlocks(XLogRecord *record, XLogRecPtr lsn)
|
|
{
|
|
Relation reln;
|
|
Buffer buffer;
|
|
Page page;
|
|
BkpBlock bkpb;
|
|
char *blk;
|
|
int i;
|
|
|
|
blk = (char*)XLogRecGetData(record) + record->xl_len;
|
|
for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
|
|
{
|
|
if (!(record->xl_info & XLR_SET_BKP_BLOCK(i)))
|
|
continue;
|
|
|
|
memcpy((char*)&bkpb, blk, sizeof(BkpBlock));
|
|
blk += sizeof(BkpBlock);
|
|
|
|
reln = XLogOpenRelation(true, record->xl_rmid, bkpb.node);
|
|
|
|
if (reln)
|
|
{
|
|
buffer = XLogReadBuffer(true, reln, bkpb.block);
|
|
if (BufferIsValid(buffer))
|
|
{
|
|
page = (Page) BufferGetPage(buffer);
|
|
memcpy((char*)page, blk, BLCKSZ);
|
|
PageSetLSN(page, lsn);
|
|
PageSetSUI(page, ThisStartUpID);
|
|
UnlockAndWriteBuffer(buffer);
|
|
}
|
|
}
|
|
|
|
blk += BLCKSZ;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* CRC-check an XLOG record. We do not believe the contents of an XLOG
|
|
* record (other than to the minimal extent of computing the amount of
|
|
* data to read in) until we've checked the CRCs.
|
|
*
|
|
* We assume all of the record has been read into memory at *record.
|
|
*/
|
|
static bool
|
|
RecordIsValid(XLogRecord *record, XLogRecPtr recptr, int emode)
|
|
{
|
|
crc64 crc;
|
|
crc64 cbuf;
|
|
int i;
|
|
uint32 len = record->xl_len;
|
|
char *blk;
|
|
|
|
/* Check CRC of rmgr data and record header */
|
|
INIT_CRC64(crc);
|
|
COMP_CRC64(crc, XLogRecGetData(record), len);
|
|
COMP_CRC64(crc, (char*) record + sizeof(crc64),
|
|
SizeOfXLogRecord - sizeof(crc64));
|
|
FIN_CRC64(crc);
|
|
|
|
if (!EQ_CRC64(record->xl_crc, crc))
|
|
{
|
|
elog(emode, "ReadRecord: bad rmgr data CRC in record at %u/%u",
|
|
recptr.xlogid, recptr.xrecoff);
|
|
return(false);
|
|
}
|
|
|
|
/* Check CRCs of backup blocks, if any */
|
|
blk = (char*)XLogRecGetData(record) + len;
|
|
for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
|
|
{
|
|
if (!(record->xl_info & XLR_SET_BKP_BLOCK(i)))
|
|
continue;
|
|
|
|
INIT_CRC64(crc);
|
|
COMP_CRC64(crc, blk + sizeof(BkpBlock), BLCKSZ);
|
|
COMP_CRC64(crc, blk + sizeof(crc64),
|
|
sizeof(BkpBlock) - sizeof(crc64));
|
|
FIN_CRC64(crc);
|
|
memcpy((char*)&cbuf, blk, sizeof(crc64)); /* don't assume alignment */
|
|
|
|
if (!EQ_CRC64(cbuf, crc))
|
|
{
|
|
elog(emode, "ReadRecord: bad bkp block %d CRC in record at %u/%u",
|
|
i + 1, recptr.xlogid, recptr.xrecoff);
|
|
return(false);
|
|
}
|
|
blk += sizeof(BkpBlock) + BLCKSZ;
|
|
}
|
|
|
|
return(true);
|
|
}
|
|
|
|
/*
|
|
* Attempt to read an XLOG record.
|
|
*
|
|
* If RecPtr is not NULL, try to read a record at that position. Otherwise
|
|
* try to read a record just after the last one previously read.
|
|
*
|
|
* If no valid record is available, returns NULL, or fails if emode is STOP.
|
|
* (emode must be either STOP or LOG.)
|
|
*
|
|
* buffer is a workspace at least _INTL_MAXLOGRECSZ bytes long. It is needed
|
|
* to reassemble a record that crosses block boundaries. Note that on
|
|
* successful return, the returned record pointer always points at buffer.
|
|
*/
|
|
static XLogRecord *
|
|
ReadRecord(XLogRecPtr *RecPtr, int emode, char *buffer)
|
|
{
|
|
XLogRecord *record;
|
|
XLogRecPtr tmpRecPtr = EndRecPtr;
|
|
uint32 len,
|
|
total_len;
|
|
uint32 targetPageOff;
|
|
unsigned i;
|
|
bool nextmode = false;
|
|
|
|
if (readBuf == NULL)
|
|
{
|
|
/*
|
|
* First time through, permanently allocate readBuf. We do it
|
|
* this way, rather than just making a static array, for two
|
|
* reasons: (1) no need to waste the storage in most instantiations
|
|
* of the backend; (2) a static char array isn't guaranteed to
|
|
* have any particular alignment, whereas malloc() will provide
|
|
* MAXALIGN'd storage.
|
|
*/
|
|
readBuf = (char *) malloc(BLCKSZ);
|
|
Assert(readBuf != NULL);
|
|
}
|
|
|
|
if (RecPtr == NULL)
|
|
{
|
|
RecPtr = &tmpRecPtr;
|
|
nextmode = true;
|
|
/* fast case if next record is on same page */
|
|
if (nextRecord != NULL)
|
|
{
|
|
record = nextRecord;
|
|
goto got_record;
|
|
}
|
|
/* align old recptr to next page */
|
|
if (tmpRecPtr.xrecoff % BLCKSZ != 0)
|
|
tmpRecPtr.xrecoff += (BLCKSZ - tmpRecPtr.xrecoff % BLCKSZ);
|
|
if (tmpRecPtr.xrecoff >= XLogFileSize)
|
|
{
|
|
(tmpRecPtr.xlogid)++;
|
|
tmpRecPtr.xrecoff = 0;
|
|
}
|
|
tmpRecPtr.xrecoff += SizeOfXLogPHD;
|
|
}
|
|
else if (!XRecOffIsValid(RecPtr->xrecoff))
|
|
elog(STOP, "ReadRecord: invalid record offset at (%u, %u)",
|
|
RecPtr->xlogid, RecPtr->xrecoff);
|
|
|
|
if (readFile >= 0 && !XLByteInSeg(*RecPtr, readId, readSeg))
|
|
{
|
|
close(readFile);
|
|
readFile = -1;
|
|
}
|
|
XLByteToSeg(*RecPtr, readId, readSeg);
|
|
if (readFile < 0)
|
|
{
|
|
readFile = XLogFileOpen(readId, readSeg, (emode == LOG));
|
|
if (readFile < 0)
|
|
goto next_record_is_invalid;
|
|
readOff = (uint32) (-1); /* force read to occur below */
|
|
}
|
|
|
|
targetPageOff = ((RecPtr->xrecoff % XLogSegSize) / BLCKSZ) * BLCKSZ;
|
|
if (readOff != targetPageOff)
|
|
{
|
|
readOff = targetPageOff;
|
|
if (lseek(readFile, (off_t) readOff, SEEK_SET) < 0)
|
|
{
|
|
elog(emode, "ReadRecord: lseek(logfile %u seg %u off %u) failed: %m",
|
|
readId, readSeg, readOff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
if (read(readFile, readBuf, BLCKSZ) != BLCKSZ)
|
|
{
|
|
elog(emode, "ReadRecord: read(logfile %u seg %u off %u) failed: %m",
|
|
readId, readSeg, readOff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
if (!ValidXLOGHeader((XLogPageHeader) readBuf, emode, nextmode))
|
|
goto next_record_is_invalid;
|
|
}
|
|
if ((((XLogPageHeader) readBuf)->xlp_info & XLP_FIRST_IS_CONTRECORD) &&
|
|
RecPtr->xrecoff % BLCKSZ == SizeOfXLogPHD)
|
|
{
|
|
elog(emode, "ReadRecord: contrecord is requested by (%u, %u)",
|
|
RecPtr->xlogid, RecPtr->xrecoff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
record = (XLogRecord *) ((char *) readBuf + RecPtr->xrecoff % BLCKSZ);
|
|
|
|
got_record:;
|
|
/*
|
|
* Currently, xl_len == 0 must be bad data, but that might not be
|
|
* true forever. See note in XLogInsert.
|
|
*/
|
|
if (record->xl_len == 0)
|
|
{
|
|
elog(emode, "ReadRecord: record with zero len at (%u, %u)",
|
|
RecPtr->xlogid, RecPtr->xrecoff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
/*
|
|
* Compute total length of record including any appended backup blocks.
|
|
*/
|
|
total_len = SizeOfXLogRecord + record->xl_len;
|
|
for (i = 0; i < XLR_MAX_BKP_BLOCKS; i++)
|
|
{
|
|
if (!(record->xl_info & XLR_SET_BKP_BLOCK(i)))
|
|
continue;
|
|
total_len += sizeof(BkpBlock) + BLCKSZ;
|
|
}
|
|
/*
|
|
* Make sure it will fit in buffer (currently, it is mechanically
|
|
* impossible for this test to fail, but it seems like a good idea
|
|
* anyway).
|
|
*/
|
|
if (total_len > _INTL_MAXLOGRECSZ)
|
|
{
|
|
elog(emode, "ReadRecord: too long record len %u at (%u, %u)",
|
|
total_len, RecPtr->xlogid, RecPtr->xrecoff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
if (record->xl_rmid > RM_MAX_ID)
|
|
{
|
|
elog(emode, "ReadRecord: invalid resource manager id %u at (%u, %u)",
|
|
record->xl_rmid, RecPtr->xlogid, RecPtr->xrecoff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
nextRecord = NULL;
|
|
len = BLCKSZ - RecPtr->xrecoff % BLCKSZ;
|
|
if (total_len > len)
|
|
{
|
|
/* Need to reassemble record */
|
|
XLogContRecord *contrecord;
|
|
uint32 gotlen = len;
|
|
|
|
memcpy(buffer, record, len);
|
|
record = (XLogRecord *) buffer;
|
|
buffer += len;
|
|
for (;;)
|
|
{
|
|
readOff += BLCKSZ;
|
|
if (readOff >= XLogSegSize)
|
|
{
|
|
close(readFile);
|
|
readFile = -1;
|
|
NextLogSeg(readId, readSeg);
|
|
readFile = XLogFileOpen(readId, readSeg, (emode == LOG));
|
|
if (readFile < 0)
|
|
goto next_record_is_invalid;
|
|
readOff = 0;
|
|
}
|
|
if (read(readFile, readBuf, BLCKSZ) != BLCKSZ)
|
|
{
|
|
elog(emode, "ReadRecord: read(logfile %u seg %u off %u) failed: %m",
|
|
readId, readSeg, readOff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
if (!ValidXLOGHeader((XLogPageHeader) readBuf, emode, true))
|
|
goto next_record_is_invalid;
|
|
if (!(((XLogPageHeader) readBuf)->xlp_info & XLP_FIRST_IS_CONTRECORD))
|
|
{
|
|
elog(emode, "ReadRecord: there is no ContRecord flag in logfile %u seg %u off %u",
|
|
readId, readSeg, readOff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
contrecord = (XLogContRecord *) ((char *) readBuf + SizeOfXLogPHD);
|
|
if (contrecord->xl_rem_len == 0 ||
|
|
total_len != (contrecord->xl_rem_len + gotlen))
|
|
{
|
|
elog(emode, "ReadRecord: invalid cont-record len %u in logfile %u seg %u off %u",
|
|
contrecord->xl_rem_len, readId, readSeg, readOff);
|
|
goto next_record_is_invalid;
|
|
}
|
|
len = BLCKSZ - SizeOfXLogPHD - SizeOfXLogContRecord;
|
|
if (contrecord->xl_rem_len > len)
|
|
{
|
|
memcpy(buffer, (char *)contrecord + SizeOfXLogContRecord, len);
|
|
gotlen += len;
|
|
buffer += len;
|
|
continue;
|
|
}
|
|
memcpy(buffer, (char *) contrecord + SizeOfXLogContRecord,
|
|
contrecord->xl_rem_len);
|
|
break;
|
|
}
|
|
if (!RecordIsValid(record, *RecPtr, emode))
|
|
goto next_record_is_invalid;
|
|
if (BLCKSZ - SizeOfXLogRecord >= SizeOfXLogPHD +
|
|
SizeOfXLogContRecord + MAXALIGN(contrecord->xl_rem_len))
|
|
{
|
|
nextRecord = (XLogRecord *) ((char *) contrecord +
|
|
SizeOfXLogContRecord + MAXALIGN(contrecord->xl_rem_len));
|
|
}
|
|
EndRecPtr.xlogid = readId;
|
|
EndRecPtr.xrecoff = readSeg * XLogSegSize + readOff +
|
|
SizeOfXLogPHD + SizeOfXLogContRecord +
|
|
MAXALIGN(contrecord->xl_rem_len);
|
|
ReadRecPtr = *RecPtr;
|
|
return record;
|
|
}
|
|
|
|
/* Record does not cross a page boundary */
|
|
if (!RecordIsValid(record, *RecPtr, emode))
|
|
goto next_record_is_invalid;
|
|
if (BLCKSZ - SizeOfXLogRecord >= RecPtr->xrecoff % BLCKSZ +
|
|
MAXALIGN(total_len))
|
|
nextRecord = (XLogRecord *) ((char *) record + MAXALIGN(total_len));
|
|
EndRecPtr.xlogid = RecPtr->xlogid;
|
|
EndRecPtr.xrecoff = RecPtr->xrecoff + MAXALIGN(total_len);
|
|
ReadRecPtr = *RecPtr;
|
|
memcpy(buffer, record, total_len);
|
|
return (XLogRecord *) buffer;
|
|
|
|
next_record_is_invalid:;
|
|
close(readFile);
|
|
readFile = -1;
|
|
nextRecord = NULL;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Check whether the xlog header of a page just read in looks valid.
|
|
*
|
|
* This is just a convenience subroutine to avoid duplicated code in
|
|
* ReadRecord. It's not intended for use from anywhere else.
|
|
*/
|
|
static bool
|
|
ValidXLOGHeader(XLogPageHeader hdr, int emode, bool checkSUI)
|
|
{
|
|
if (hdr->xlp_magic != XLOG_PAGE_MAGIC)
|
|
{
|
|
elog(emode, "ReadRecord: invalid magic number %04X in logfile %u seg %u off %u",
|
|
hdr->xlp_magic, readId, readSeg, readOff);
|
|
return false;
|
|
}
|
|
if ((hdr->xlp_info & ~XLP_ALL_FLAGS) != 0)
|
|
{
|
|
elog(emode, "ReadRecord: invalid info bits %04X in logfile %u seg %u off %u",
|
|
hdr->xlp_info, readId, readSeg, readOff);
|
|
return false;
|
|
}
|
|
/*
|
|
* We disbelieve a SUI less than the previous page's SUI, or more
|
|
* than a few counts greater. In theory as many as 512 shutdown
|
|
* checkpoint records could appear on a 32K-sized xlog page, so
|
|
* that's the most differential there could legitimately be.
|
|
*
|
|
* Note this check can only be applied when we are reading the next page
|
|
* in sequence, so ReadRecord passes a flag indicating whether to check.
|
|
*/
|
|
if (checkSUI)
|
|
{
|
|
if (hdr->xlp_sui < lastReadSUI ||
|
|
hdr->xlp_sui > lastReadSUI + 512)
|
|
{
|
|
elog(emode, "ReadRecord: out-of-sequence SUI %u (after %u) in logfile %u seg %u off %u",
|
|
hdr->xlp_sui, lastReadSUI, readId, readSeg, readOff);
|
|
return false;
|
|
}
|
|
}
|
|
lastReadSUI = hdr->xlp_sui;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* I/O routines for pg_control
|
|
*
|
|
* *ControlFile is a buffer in shared memory that holds an image of the
|
|
* contents of pg_control. WriteControlFile() initializes pg_control
|
|
* given a preloaded buffer, ReadControlFile() loads the buffer from
|
|
* the pg_control file (during postmaster or standalone-backend startup),
|
|
* and UpdateControlFile() rewrites pg_control after we modify xlog state.
|
|
*
|
|
* For simplicity, WriteControlFile() initializes the fields of pg_control
|
|
* that are related to checking backend/database compatibility, and
|
|
* ReadControlFile() verifies they are correct. We could split out the
|
|
* I/O and compatibility-check functions, but there seems no need currently.
|
|
*/
|
|
|
|
void
|
|
XLOGPathInit(void)
|
|
{
|
|
/* Init XLOG file paths */
|
|
snprintf(XLogDir, MAXPGPATH, "%s%cpg_xlog", DataDir, SEP_CHAR);
|
|
snprintf(ControlFilePath, MAXPGPATH, "%s%cglobal%cpg_control",
|
|
DataDir, SEP_CHAR, SEP_CHAR);
|
|
}
|
|
|
|
static void
|
|
WriteControlFile(void)
|
|
{
|
|
int fd;
|
|
char buffer[BLCKSZ]; /* need not be aligned */
|
|
#ifdef USE_LOCALE
|
|
char *localeptr;
|
|
#endif
|
|
|
|
/*
|
|
* Initialize version and compatibility-check fields
|
|
*/
|
|
ControlFile->pg_control_version = PG_CONTROL_VERSION;
|
|
ControlFile->catalog_version_no = CATALOG_VERSION_NO;
|
|
ControlFile->blcksz = BLCKSZ;
|
|
ControlFile->relseg_size = RELSEG_SIZE;
|
|
#ifdef USE_LOCALE
|
|
localeptr = setlocale(LC_COLLATE, NULL);
|
|
if (!localeptr)
|
|
elog(STOP, "Invalid LC_COLLATE setting");
|
|
StrNCpy(ControlFile->lc_collate, localeptr, LOCALE_NAME_BUFLEN);
|
|
localeptr = setlocale(LC_CTYPE, NULL);
|
|
if (!localeptr)
|
|
elog(STOP, "Invalid LC_CTYPE setting");
|
|
StrNCpy(ControlFile->lc_ctype, localeptr, LOCALE_NAME_BUFLEN);
|
|
/*
|
|
* Issue warning notice if initdb'ing in a locale that will not permit
|
|
* LIKE index optimization. This is not a clean place to do it, but
|
|
* I don't see a better place either...
|
|
*/
|
|
if (!locale_is_like_safe())
|
|
elog(NOTICE, "Initializing database with %s collation order."
|
|
"\n\tThis locale setting will prevent use of index optimization for"
|
|
"\n\tLIKE and regexp searches. If you are concerned about speed of"
|
|
"\n\tsuch queries, you may wish to set LC_COLLATE to \"C\" and"
|
|
"\n\tre-initdb. For more information see the Administrator's Guide.",
|
|
ControlFile->lc_collate);
|
|
#else
|
|
strcpy(ControlFile->lc_collate, "C");
|
|
strcpy(ControlFile->lc_ctype, "C");
|
|
#endif
|
|
|
|
/* Contents are protected with a CRC */
|
|
INIT_CRC64(ControlFile->crc);
|
|
COMP_CRC64(ControlFile->crc,
|
|
(char*) ControlFile + sizeof(crc64),
|
|
sizeof(ControlFileData) - sizeof(crc64));
|
|
FIN_CRC64(ControlFile->crc);
|
|
|
|
/*
|
|
* We write out BLCKSZ bytes into pg_control, zero-padding the
|
|
* excess over sizeof(ControlFileData). This reduces the odds
|
|
* of premature-EOF errors when reading pg_control. We'll still
|
|
* fail when we check the contents of the file, but hopefully with
|
|
* a more specific error than "couldn't read pg_control".
|
|
*/
|
|
if (sizeof(ControlFileData) > BLCKSZ)
|
|
elog(STOP, "sizeof(ControlFileData) is too large ... fix xlog.c");
|
|
|
|
memset(buffer, 0, BLCKSZ);
|
|
memcpy(buffer, ControlFile, sizeof(ControlFileData));
|
|
|
|
fd = BasicOpenFile(ControlFilePath, O_RDWR | O_CREAT | O_EXCL | PG_BINARY,
|
|
S_IRUSR | S_IWUSR);
|
|
if (fd < 0)
|
|
elog(STOP, "WriteControlFile failed to create control file (%s): %m",
|
|
ControlFilePath);
|
|
|
|
if (write(fd, buffer, BLCKSZ) != BLCKSZ)
|
|
elog(STOP, "WriteControlFile failed to write control file: %m");
|
|
|
|
if (pg_fsync(fd) != 0)
|
|
elog(STOP, "WriteControlFile failed to fsync control file: %m");
|
|
|
|
close(fd);
|
|
}
|
|
|
|
static void
|
|
ReadControlFile(void)
|
|
{
|
|
crc64 crc;
|
|
int fd;
|
|
|
|
/*
|
|
* Read data...
|
|
*/
|
|
fd = BasicOpenFile(ControlFilePath, O_RDWR | PG_BINARY, S_IRUSR | S_IWUSR);
|
|
if (fd < 0)
|
|
elog(STOP, "open(\"%s\") failed: %m", ControlFilePath);
|
|
|
|
if (read(fd, ControlFile, sizeof(ControlFileData)) != sizeof(ControlFileData))
|
|
elog(STOP, "read(\"%s\") failed: %m", ControlFilePath);
|
|
|
|
close(fd);
|
|
|
|
/*
|
|
* Check for expected pg_control format version. If this is wrong,
|
|
* the CRC check will likely fail because we'll be checking the wrong
|
|
* number of bytes. Complaining about wrong version will probably be
|
|
* more enlightening than complaining about wrong CRC.
|
|
*/
|
|
if (ControlFile->pg_control_version != PG_CONTROL_VERSION)
|
|
elog(STOP, "database was initialized with PG_CONTROL_VERSION %d,\n\tbut the backend was compiled with PG_CONTROL_VERSION %d.\n\tlooks like you need to initdb.",
|
|
ControlFile->pg_control_version, PG_CONTROL_VERSION);
|
|
|
|
/* Now check the CRC. */
|
|
INIT_CRC64(crc);
|
|
COMP_CRC64(crc,
|
|
(char*) ControlFile + sizeof(crc64),
|
|
sizeof(ControlFileData) - sizeof(crc64));
|
|
FIN_CRC64(crc);
|
|
|
|
if (!EQ_CRC64(crc, ControlFile->crc))
|
|
elog(STOP, "Invalid CRC in control file");
|
|
|
|
/*
|
|
* Do compatibility checking immediately. We do this here for 2 reasons:
|
|
*
|
|
* (1) if the database isn't compatible with the backend executable,
|
|
* we want to abort before we can possibly do any damage;
|
|
*
|
|
* (2) this code is executed in the postmaster, so the setlocale() will
|
|
* propagate to forked backends, which aren't going to read this file
|
|
* for themselves. (These locale settings are considered critical
|
|
* compatibility items because they can affect sort order of indexes.)
|
|
*/
|
|
if (ControlFile->catalog_version_no != CATALOG_VERSION_NO)
|
|
elog(STOP, "database was initialized with CATALOG_VERSION_NO %d,\n\tbut the backend was compiled with CATALOG_VERSION_NO %d.\n\tlooks like you need to initdb.",
|
|
ControlFile->catalog_version_no, CATALOG_VERSION_NO);
|
|
if (ControlFile->blcksz != BLCKSZ)
|
|
elog(STOP, "database was initialized with BLCKSZ %d,\n\tbut the backend was compiled with BLCKSZ %d.\n\tlooks like you need to initdb.",
|
|
ControlFile->blcksz, BLCKSZ);
|
|
if (ControlFile->relseg_size != RELSEG_SIZE)
|
|
elog(STOP, "database was initialized with RELSEG_SIZE %d,\n\tbut the backend was compiled with RELSEG_SIZE %d.\n\tlooks like you need to initdb.",
|
|
ControlFile->relseg_size, RELSEG_SIZE);
|
|
#ifdef USE_LOCALE
|
|
if (setlocale(LC_COLLATE, ControlFile->lc_collate) == NULL)
|
|
elog(STOP, "database was initialized with LC_COLLATE '%s',\n\twhich is not recognized by setlocale().\n\tlooks like you need to initdb.",
|
|
ControlFile->lc_collate);
|
|
if (setlocale(LC_CTYPE, ControlFile->lc_ctype) == NULL)
|
|
elog(STOP, "database was initialized with LC_CTYPE '%s',\n\twhich is not recognized by setlocale().\n\tlooks like you need to initdb.",
|
|
ControlFile->lc_ctype);
|
|
#else
|
|
if (strcmp(ControlFile->lc_collate, "C") != 0 ||
|
|
strcmp(ControlFile->lc_ctype, "C") != 0)
|
|
elog(STOP, "database was initialized with LC_COLLATE '%s' and LC_CTYPE '%s',\n\tbut the backend was compiled without locale support.\n\tlooks like you need to initdb or recompile.",
|
|
ControlFile->lc_collate, ControlFile->lc_ctype);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
UpdateControlFile(void)
|
|
{
|
|
int fd;
|
|
|
|
INIT_CRC64(ControlFile->crc);
|
|
COMP_CRC64(ControlFile->crc,
|
|
(char*) ControlFile + sizeof(crc64),
|
|
sizeof(ControlFileData) - sizeof(crc64));
|
|
FIN_CRC64(ControlFile->crc);
|
|
|
|
fd = BasicOpenFile(ControlFilePath, O_RDWR | PG_BINARY, S_IRUSR | S_IWUSR);
|
|
if (fd < 0)
|
|
elog(STOP, "open(\"%s\") failed: %m", ControlFilePath);
|
|
|
|
if (write(fd, ControlFile, sizeof(ControlFileData)) != sizeof(ControlFileData))
|
|
elog(STOP, "write(cntlfile) failed: %m");
|
|
|
|
if (pg_fsync(fd) != 0)
|
|
elog(STOP, "fsync(cntlfile) failed: %m");
|
|
|
|
close(fd);
|
|
}
|
|
|
|
/*
|
|
* Initialization of shared memory for XLOG
|
|
*/
|
|
|
|
int
|
|
XLOGShmemSize(void)
|
|
{
|
|
if (XLOGbuffers < MinXLOGbuffers)
|
|
XLOGbuffers = MinXLOGbuffers;
|
|
|
|
return MAXALIGN(sizeof(XLogCtlData) + sizeof(XLogRecPtr) * XLOGbuffers)
|
|
+ BLCKSZ * XLOGbuffers +
|
|
MAXALIGN(sizeof(ControlFileData));
|
|
}
|
|
|
|
void
|
|
XLOGShmemInit(void)
|
|
{
|
|
bool found;
|
|
|
|
/* this must agree with space requested by XLOGShmemSize() */
|
|
if (XLOGbuffers < MinXLOGbuffers)
|
|
XLOGbuffers = MinXLOGbuffers;
|
|
|
|
XLogCtl = (XLogCtlData *)
|
|
ShmemInitStruct("XLOG Ctl",
|
|
MAXALIGN(sizeof(XLogCtlData) +
|
|
sizeof(XLogRecPtr) * XLOGbuffers)
|
|
+ BLCKSZ * XLOGbuffers,
|
|
&found);
|
|
Assert(!found);
|
|
ControlFile = (ControlFileData *)
|
|
ShmemInitStruct("Control File", sizeof(ControlFileData), &found);
|
|
Assert(!found);
|
|
|
|
memset(XLogCtl, 0, sizeof(XLogCtlData));
|
|
/*
|
|
* Since XLogCtlData contains XLogRecPtr fields, its sizeof should be
|
|
* a multiple of the alignment for same, so no extra alignment padding
|
|
* is needed here.
|
|
*/
|
|
XLogCtl->xlblocks = (XLogRecPtr *)
|
|
(((char *) XLogCtl) + sizeof(XLogCtlData));
|
|
memset(XLogCtl->xlblocks, 0, sizeof(XLogRecPtr) * XLOGbuffers);
|
|
/*
|
|
* Here, on the other hand, we must MAXALIGN to ensure the page buffers
|
|
* have worst-case alignment.
|
|
*/
|
|
XLogCtl->pages =
|
|
((char *) XLogCtl) + MAXALIGN(sizeof(XLogCtlData) +
|
|
sizeof(XLogRecPtr) * XLOGbuffers);
|
|
memset(XLogCtl->pages, 0, BLCKSZ * XLOGbuffers);
|
|
|
|
/*
|
|
* Do basic initialization of XLogCtl shared data.
|
|
* (StartupXLOG will fill in additional info.)
|
|
*/
|
|
XLogCtl->XLogCacheByte = BLCKSZ * XLOGbuffers;
|
|
XLogCtl->XLogCacheBlck = XLOGbuffers - 1;
|
|
XLogCtl->Insert.currpage = (XLogPageHeader) (XLogCtl->pages);
|
|
S_INIT_LOCK(&(XLogCtl->insert_lck));
|
|
S_INIT_LOCK(&(XLogCtl->info_lck));
|
|
S_INIT_LOCK(&(XLogCtl->logwrt_lck));
|
|
S_INIT_LOCK(&(XLogCtl->chkp_lck));
|
|
|
|
/*
|
|
* If we are not in bootstrap mode, pg_control should already exist.
|
|
* Read and validate it immediately (see comments in ReadControlFile()
|
|
* for the reasons why).
|
|
*/
|
|
if (!IsBootstrapProcessingMode())
|
|
ReadControlFile();
|
|
}
|
|
|
|
/*
|
|
* This func must be called ONCE on system install. It creates pg_control
|
|
* and the initial XLOG segment.
|
|
*/
|
|
void
|
|
BootStrapXLOG(void)
|
|
{
|
|
CheckPoint checkPoint;
|
|
char *buffer;
|
|
XLogPageHeader page;
|
|
XLogRecord *record;
|
|
bool usexistent = false;
|
|
crc64 crc;
|
|
|
|
/* Use malloc() to ensure buffer is MAXALIGNED */
|
|
buffer = (char *) malloc(BLCKSZ);
|
|
page = (XLogPageHeader) buffer;
|
|
|
|
checkPoint.redo.xlogid = 0;
|
|
checkPoint.redo.xrecoff = SizeOfXLogPHD;
|
|
checkPoint.undo = checkPoint.redo;
|
|
checkPoint.ThisStartUpID = 0;
|
|
checkPoint.nextXid = FirstTransactionId;
|
|
checkPoint.nextOid = BootstrapObjectIdData;
|
|
checkPoint.time = time(NULL);
|
|
|
|
ShmemVariableCache->nextXid = checkPoint.nextXid;
|
|
ShmemVariableCache->xidCount = 0;
|
|
ShmemVariableCache->nextOid = checkPoint.nextOid;
|
|
ShmemVariableCache->oidCount = 0;
|
|
|
|
memset(buffer, 0, BLCKSZ);
|
|
page->xlp_magic = XLOG_PAGE_MAGIC;
|
|
page->xlp_info = 0;
|
|
page->xlp_sui = checkPoint.ThisStartUpID;
|
|
record = (XLogRecord *) ((char *) page + SizeOfXLogPHD);
|
|
record->xl_prev.xlogid = 0;
|
|
record->xl_prev.xrecoff = 0;
|
|
record->xl_xact_prev = record->xl_prev;
|
|
record->xl_xid = InvalidTransactionId;
|
|
record->xl_len = sizeof(checkPoint);
|
|
record->xl_info = XLOG_CHECKPOINT_SHUTDOWN;
|
|
record->xl_rmid = RM_XLOG_ID;
|
|
memcpy(XLogRecGetData(record), &checkPoint, sizeof(checkPoint));
|
|
|
|
INIT_CRC64(crc);
|
|
COMP_CRC64(crc, &checkPoint, sizeof(checkPoint));
|
|
COMP_CRC64(crc, (char*) record + sizeof(crc64),
|
|
SizeOfXLogRecord - sizeof(crc64));
|
|
FIN_CRC64(crc);
|
|
record->xl_crc = crc;
|
|
|
|
openLogFile = XLogFileInit(0, 0, &usexistent);
|
|
|
|
if (write(openLogFile, buffer, BLCKSZ) != BLCKSZ)
|
|
elog(STOP, "BootStrapXLOG failed to write logfile: %m");
|
|
|
|
if (pg_fsync(openLogFile) != 0)
|
|
elog(STOP, "BootStrapXLOG failed to fsync logfile: %m");
|
|
|
|
close(openLogFile);
|
|
openLogFile = -1;
|
|
|
|
memset(ControlFile, 0, sizeof(ControlFileData));
|
|
/* Initialize pg_control status fields */
|
|
ControlFile->state = DB_SHUTDOWNED;
|
|
ControlFile->time = checkPoint.time;
|
|
ControlFile->logId = 0;
|
|
ControlFile->logSeg = 1;
|
|
ControlFile->checkPoint = checkPoint.redo;
|
|
ControlFile->checkPointCopy = checkPoint;
|
|
/* some additional ControlFile fields are set in WriteControlFile() */
|
|
|
|
WriteControlFile();
|
|
}
|
|
|
|
static char *
|
|
str_time(time_t tnow)
|
|
{
|
|
static char buf[32];
|
|
|
|
strftime(buf, sizeof(buf),
|
|
"%Y-%m-%d %H:%M:%S %Z",
|
|
localtime(&tnow));
|
|
|
|
return buf;
|
|
}
|
|
|
|
/*
|
|
* This must be called ONCE during postmaster or standalone-backend startup
|
|
*/
|
|
void
|
|
StartupXLOG(void)
|
|
{
|
|
XLogCtlInsert *Insert;
|
|
CheckPoint checkPoint;
|
|
bool wasShutdown;
|
|
XLogRecPtr RecPtr,
|
|
LastRec,
|
|
checkPointLoc,
|
|
EndOfLog;
|
|
XLogRecord *record;
|
|
char *buffer;
|
|
|
|
/* Use malloc() to ensure record buffer is MAXALIGNED */
|
|
buffer = (char *) malloc(_INTL_MAXLOGRECSZ);
|
|
|
|
CritSectionCount++;
|
|
|
|
/*
|
|
* Read control file and check XLOG status looks valid.
|
|
*
|
|
* Note: in most control paths, *ControlFile is already valid and we
|
|
* need not do ReadControlFile() here, but might as well do it to be sure.
|
|
*/
|
|
ReadControlFile();
|
|
|
|
if (ControlFile->logSeg == 0 ||
|
|
ControlFile->time <= 0 ||
|
|
ControlFile->state < DB_SHUTDOWNED ||
|
|
ControlFile->state > DB_IN_PRODUCTION ||
|
|
!XRecOffIsValid(ControlFile->checkPoint.xrecoff))
|
|
elog(STOP, "control file context is broken");
|
|
|
|
if (ControlFile->state == DB_SHUTDOWNED)
|
|
elog(LOG, "database system was shut down at %s",
|
|
str_time(ControlFile->time));
|
|
else if (ControlFile->state == DB_SHUTDOWNING)
|
|
elog(LOG, "database system shutdown was interrupted at %s",
|
|
str_time(ControlFile->time));
|
|
else if (ControlFile->state == DB_IN_RECOVERY)
|
|
elog(LOG, "database system was interrupted being in recovery at %s\n"
|
|
"\tThis propably means that some data blocks are corrupted\n"
|
|
"\tand you will have to use last backup for recovery.",
|
|
str_time(ControlFile->time));
|
|
else if (ControlFile->state == DB_IN_PRODUCTION)
|
|
elog(LOG, "database system was interrupted at %s",
|
|
str_time(ControlFile->time));
|
|
|
|
/*
|
|
* Get the last valid checkpoint record. If the latest one according
|
|
* to pg_control is broken, try the next-to-last one.
|
|
*/
|
|
record = ReadCheckpointRecord(ControlFile->checkPoint,
|
|
"primary", buffer);
|
|
if (record != NULL)
|
|
{
|
|
checkPointLoc = ControlFile->checkPoint;
|
|
elog(LOG, "CheckPoint record at (%u, %u)",
|
|
checkPointLoc.xlogid, checkPointLoc.xrecoff);
|
|
}
|
|
else
|
|
{
|
|
record = ReadCheckpointRecord(ControlFile->prevCheckPoint,
|
|
"secondary", buffer);
|
|
if (record != NULL)
|
|
{
|
|
checkPointLoc = ControlFile->prevCheckPoint;
|
|
elog(LOG, "Using previous CheckPoint record at (%u, %u)",
|
|
checkPointLoc.xlogid, checkPointLoc.xrecoff);
|
|
InRecovery = true; /* force recovery even if SHUTDOWNED */
|
|
}
|
|
else
|
|
{
|
|
elog(STOP, "Unable to locate a valid CheckPoint record");
|
|
}
|
|
}
|
|
LastRec = RecPtr = checkPointLoc;
|
|
memcpy(&checkPoint, XLogRecGetData(record), sizeof(CheckPoint));
|
|
wasShutdown = (record->xl_info == XLOG_CHECKPOINT_SHUTDOWN);
|
|
|
|
elog(LOG, "Redo record at (%u, %u); Undo record at (%u, %u); Shutdown %s",
|
|
checkPoint.redo.xlogid, checkPoint.redo.xrecoff,
|
|
checkPoint.undo.xlogid, checkPoint.undo.xrecoff,
|
|
wasShutdown ? "TRUE" : "FALSE");
|
|
elog(LOG, "NextTransactionId: %u; NextOid: %u",
|
|
checkPoint.nextXid, checkPoint.nextOid);
|
|
if (checkPoint.nextXid < FirstTransactionId ||
|
|
checkPoint.nextOid < BootstrapObjectIdData)
|
|
elog(STOP, "Invalid NextTransactionId/NextOid");
|
|
|
|
ShmemVariableCache->nextXid = checkPoint.nextXid;
|
|
ShmemVariableCache->xidCount = 0;
|
|
ShmemVariableCache->nextOid = checkPoint.nextOid;
|
|
ShmemVariableCache->oidCount = 0;
|
|
|
|
ThisStartUpID = checkPoint.ThisStartUpID;
|
|
RedoRecPtr = XLogCtl->Insert.RedoRecPtr =
|
|
XLogCtl->RedoRecPtr = checkPoint.redo;
|
|
|
|
if (XLByteLT(RecPtr, checkPoint.redo))
|
|
elog(STOP, "Invalid redo in checkPoint record");
|
|
if (checkPoint.undo.xrecoff == 0)
|
|
checkPoint.undo = RecPtr;
|
|
|
|
if (XLByteLT(checkPoint.undo, RecPtr) ||
|
|
XLByteLT(checkPoint.redo, RecPtr))
|
|
{
|
|
if (wasShutdown)
|
|
elog(STOP, "Invalid Redo/Undo record in shutdown checkpoint");
|
|
InRecovery = true;
|
|
}
|
|
else if (ControlFile->state != DB_SHUTDOWNED)
|
|
{
|
|
InRecovery = true;
|
|
}
|
|
|
|
/* REDO */
|
|
if (InRecovery)
|
|
{
|
|
elog(LOG, "database system was not properly shut down; "
|
|
"automatic recovery in progress...");
|
|
ControlFile->state = DB_IN_RECOVERY;
|
|
ControlFile->time = time(NULL);
|
|
UpdateControlFile();
|
|
|
|
XLogOpenLogRelation(); /* open pg_log */
|
|
XLogInitRelationCache();
|
|
|
|
/* Is REDO required ? */
|
|
if (XLByteLT(checkPoint.redo, RecPtr))
|
|
record = ReadRecord(&(checkPoint.redo), STOP, buffer);
|
|
else /* read past CheckPoint record */
|
|
record = ReadRecord(NULL, LOG, buffer);
|
|
|
|
if (record != NULL)
|
|
{
|
|
InRedo = true;
|
|
elog(LOG, "redo starts at (%u, %u)",
|
|
ReadRecPtr.xlogid, ReadRecPtr.xrecoff);
|
|
do
|
|
{
|
|
if (record->xl_xid >= ShmemVariableCache->nextXid)
|
|
{
|
|
/* This probably shouldn't happen... */
|
|
ShmemVariableCache->nextXid = record->xl_xid + 1;
|
|
ShmemVariableCache->xidCount = 0;
|
|
}
|
|
if (XLOG_DEBUG)
|
|
{
|
|
char buf[8192];
|
|
|
|
sprintf(buf, "REDO @ %u/%u; LSN %u/%u: ",
|
|
ReadRecPtr.xlogid, ReadRecPtr.xrecoff,
|
|
EndRecPtr.xlogid, EndRecPtr.xrecoff);
|
|
xlog_outrec(buf, record);
|
|
strcat(buf, " - ");
|
|
RmgrTable[record->xl_rmid].rm_desc(buf,
|
|
record->xl_info, XLogRecGetData(record));
|
|
fprintf(stderr, "%s\n", buf);
|
|
}
|
|
|
|
if (record->xl_info & XLR_BKP_BLOCK_MASK)
|
|
RestoreBkpBlocks(record, EndRecPtr);
|
|
|
|
RmgrTable[record->xl_rmid].rm_redo(EndRecPtr, record);
|
|
record = ReadRecord(NULL, LOG, buffer);
|
|
} while (record != NULL);
|
|
elog(LOG, "redo done at (%u, %u)",
|
|
ReadRecPtr.xlogid, ReadRecPtr.xrecoff);
|
|
LastRec = ReadRecPtr;
|
|
InRedo = false;
|
|
}
|
|
else
|
|
elog(LOG, "redo is not required");
|
|
}
|
|
|
|
/*
|
|
* Init xlog buffer cache using the block containing the last valid
|
|
* record from the previous incarnation.
|
|
*/
|
|
record = ReadRecord(&LastRec, STOP, buffer);
|
|
EndOfLog = EndRecPtr;
|
|
XLByteToPrevSeg(EndOfLog, openLogId, openLogSeg);
|
|
openLogFile = XLogFileOpen(openLogId, openLogSeg, false);
|
|
openLogOff = 0;
|
|
ControlFile->logId = openLogId;
|
|
ControlFile->logSeg = openLogSeg + 1;
|
|
XLogCtl->xlblocks[0].xlogid = openLogId;
|
|
XLogCtl->xlblocks[0].xrecoff =
|
|
((EndOfLog.xrecoff - 1) / BLCKSZ + 1) * BLCKSZ;
|
|
Insert = &XLogCtl->Insert;
|
|
/* Tricky point here: readBuf contains the *last* block that the LastRec
|
|
* record spans, not the one it starts in, which is what we want.
|
|
*/
|
|
Assert(readOff == (XLogCtl->xlblocks[0].xrecoff - BLCKSZ) % XLogSegSize);
|
|
memcpy((char *) Insert->currpage, readBuf, BLCKSZ);
|
|
Insert->currpos = (char *) Insert->currpage +
|
|
(EndOfLog.xrecoff + BLCKSZ - XLogCtl->xlblocks[0].xrecoff);
|
|
/* Make sure rest of page is zero */
|
|
memset(Insert->currpos, 0, INSERT_FREESPACE(Insert));
|
|
Insert->PrevRecord = LastRec;
|
|
|
|
LogwrtResult.Write = LogwrtResult.Flush = EndOfLog;
|
|
|
|
XLogCtl->Write.LogwrtResult = LogwrtResult;
|
|
Insert->LogwrtResult = LogwrtResult;
|
|
XLogCtl->LogwrtResult = LogwrtResult;
|
|
|
|
XLogCtl->LogwrtRqst.Write = EndOfLog;
|
|
XLogCtl->LogwrtRqst.Flush = EndOfLog;
|
|
|
|
#ifdef NOT_USED
|
|
/* UNDO */
|
|
if (InRecovery)
|
|
{
|
|
RecPtr = ReadRecPtr;
|
|
if (XLByteLT(checkPoint.undo, RecPtr))
|
|
{
|
|
elog(LOG, "undo starts at (%u, %u)",
|
|
RecPtr.xlogid, RecPtr.xrecoff);
|
|
do
|
|
{
|
|
record = ReadRecord(&RecPtr, STOP, buffer);
|
|
if (TransactionIdIsValid(record->xl_xid) &&
|
|
!TransactionIdDidCommit(record->xl_xid))
|
|
RmgrTable[record->xl_rmid].rm_undo(EndRecPtr, record);
|
|
RecPtr = record->xl_prev;
|
|
} while (XLByteLE(checkPoint.undo, RecPtr));
|
|
elog(LOG, "undo done at (%u, %u)",
|
|
ReadRecPtr.xlogid, ReadRecPtr.xrecoff);
|
|
}
|
|
else
|
|
elog(LOG, "undo is not required");
|
|
}
|
|
#endif
|
|
|
|
if (InRecovery)
|
|
{
|
|
/*
|
|
* In case we had to use the secondary checkpoint, make sure that
|
|
* it will still be shown as the secondary checkpoint after this
|
|
* CreateCheckPoint operation; we don't want the broken primary
|
|
* checkpoint to become prevCheckPoint...
|
|
*/
|
|
ControlFile->checkPoint = checkPointLoc;
|
|
CreateCheckPoint(true);
|
|
XLogCloseRelationCache();
|
|
}
|
|
|
|
/*
|
|
* Preallocate additional log files, if wanted.
|
|
*/
|
|
PreallocXlogFiles(EndOfLog);
|
|
|
|
InRecovery = false;
|
|
|
|
ControlFile->state = DB_IN_PRODUCTION;
|
|
ControlFile->time = time(NULL);
|
|
UpdateControlFile();
|
|
|
|
ThisStartUpID++;
|
|
XLogCtl->ThisStartUpID = ThisStartUpID;
|
|
|
|
elog(LOG, "database system is in production state");
|
|
CritSectionCount--;
|
|
|
|
/* Shut down readFile facility, free space */
|
|
if (readFile >= 0)
|
|
{
|
|
close(readFile);
|
|
readFile = -1;
|
|
}
|
|
if (readBuf)
|
|
{
|
|
free(readBuf);
|
|
readBuf = NULL;
|
|
}
|
|
|
|
free(buffer);
|
|
}
|
|
|
|
/* Subroutine to try to fetch and validate a prior checkpoint record */
|
|
static XLogRecord *
|
|
ReadCheckpointRecord(XLogRecPtr RecPtr,
|
|
const char *whichChkpt,
|
|
char *buffer)
|
|
{
|
|
XLogRecord *record;
|
|
|
|
if (!XRecOffIsValid(RecPtr.xrecoff))
|
|
{
|
|
elog(LOG, "Invalid %s checkPoint link in control file", whichChkpt);
|
|
return NULL;
|
|
}
|
|
|
|
record = ReadRecord(&RecPtr, LOG, buffer);
|
|
|
|
if (record == NULL)
|
|
{
|
|
elog(LOG, "Invalid %s checkPoint record", whichChkpt);
|
|
return NULL;
|
|
}
|
|
if (record->xl_rmid != RM_XLOG_ID)
|
|
{
|
|
elog(LOG, "Invalid RMID in %s checkPoint record", whichChkpt);
|
|
return NULL;
|
|
}
|
|
if (record->xl_info != XLOG_CHECKPOINT_SHUTDOWN &&
|
|
record->xl_info != XLOG_CHECKPOINT_ONLINE)
|
|
{
|
|
elog(LOG, "Invalid xl_info in %s checkPoint record", whichChkpt);
|
|
return NULL;
|
|
}
|
|
if (record->xl_len != sizeof(CheckPoint))
|
|
{
|
|
elog(LOG, "Invalid length of %s checkPoint record", whichChkpt);
|
|
return NULL;
|
|
}
|
|
return record;
|
|
}
|
|
|
|
/*
|
|
* Postmaster uses this to initialize ThisStartUpID & RedoRecPtr from
|
|
* XLogCtlData located in shmem after successful startup.
|
|
*/
|
|
void
|
|
SetThisStartUpID(void)
|
|
{
|
|
ThisStartUpID = XLogCtl->ThisStartUpID;
|
|
RedoRecPtr = XLogCtl->RedoRecPtr;
|
|
}
|
|
|
|
/*
|
|
* CheckPoint process called by postmaster saves copy of new RedoRecPtr
|
|
* in shmem (using SetRedoRecPtr). When checkpointer completes, postmaster
|
|
* calls GetRedoRecPtr to update its own copy of RedoRecPtr, so that
|
|
* subsequently-spawned backends will start out with a reasonably up-to-date
|
|
* local RedoRecPtr. Since these operations are not protected by any spinlock
|
|
* and copying an XLogRecPtr isn't atomic, it's unsafe to use either of these
|
|
* routines at other times!
|
|
*
|
|
* Note: once spawned, a backend must update its local RedoRecPtr from
|
|
* XLogCtl->Insert.RedoRecPtr while holding the insert spinlock. This is
|
|
* done in XLogInsert().
|
|
*/
|
|
void
|
|
SetRedoRecPtr(void)
|
|
{
|
|
XLogCtl->RedoRecPtr = RedoRecPtr;
|
|
}
|
|
|
|
void
|
|
GetRedoRecPtr(void)
|
|
{
|
|
RedoRecPtr = XLogCtl->RedoRecPtr;
|
|
}
|
|
|
|
/*
|
|
* This must be called ONCE during postmaster or standalone-backend shutdown
|
|
*/
|
|
void
|
|
ShutdownXLOG(void)
|
|
{
|
|
elog(LOG, "shutting down");
|
|
|
|
/* suppress in-transaction check in CreateCheckPoint */
|
|
MyLastRecPtr.xrecoff = 0;
|
|
|
|
CritSectionCount++;
|
|
CreateDummyCaches();
|
|
CreateCheckPoint(true);
|
|
CritSectionCount--;
|
|
|
|
elog(LOG, "database system is shut down");
|
|
}
|
|
|
|
/*
|
|
* Perform a checkpoint --- either during shutdown, or on-the-fly
|
|
*/
|
|
void
|
|
CreateCheckPoint(bool shutdown)
|
|
{
|
|
CheckPoint checkPoint;
|
|
XLogRecPtr recptr;
|
|
XLogCtlInsert *Insert = &XLogCtl->Insert;
|
|
XLogRecData rdata;
|
|
uint32 freespace;
|
|
uint32 _logId;
|
|
uint32 _logSeg;
|
|
unsigned spins = 0;
|
|
|
|
if (MyLastRecPtr.xrecoff != 0)
|
|
elog(ERROR, "CreateCheckPoint: cannot be called inside transaction block");
|
|
|
|
START_CRIT_SECTION();
|
|
|
|
/* Grab lock, using larger than normal sleep between tries (1 sec) */
|
|
while (TAS(&(XLogCtl->chkp_lck)))
|
|
{
|
|
S_LOCK_SLEEP_INTERVAL(&(XLogCtl->chkp_lck), spins++,
|
|
CHECKPOINT_LOCK_TIMEOUT, 1000000);
|
|
}
|
|
|
|
if (shutdown)
|
|
{
|
|
ControlFile->state = DB_SHUTDOWNING;
|
|
ControlFile->time = time(NULL);
|
|
UpdateControlFile();
|
|
}
|
|
|
|
memset(&checkPoint, 0, sizeof(checkPoint));
|
|
checkPoint.ThisStartUpID = ThisStartUpID;
|
|
checkPoint.time = time(NULL);
|
|
|
|
S_LOCK(&(XLogCtl->insert_lck));
|
|
|
|
/*
|
|
* If this isn't a shutdown, and we have not inserted any XLOG records
|
|
* since the start of the last checkpoint, skip the checkpoint. The
|
|
* idea here is to avoid inserting duplicate checkpoints when the system
|
|
* is idle. That wastes log space, and more importantly it exposes us to
|
|
* possible loss of both current and previous checkpoint records if the
|
|
* machine crashes just as we're writing the update. (Perhaps it'd make
|
|
* even more sense to checkpoint only when the previous checkpoint record
|
|
* is in a different xlog page?)
|
|
*
|
|
* We have to make two tests to determine that nothing has happened since
|
|
* the start of the last checkpoint: current insertion point must match
|
|
* the end of the last checkpoint record, and its redo pointer must point
|
|
* to itself.
|
|
*/
|
|
if (!shutdown)
|
|
{
|
|
XLogRecPtr curInsert;
|
|
|
|
INSERT_RECPTR(curInsert, Insert, Insert->curridx);
|
|
if (curInsert.xlogid == ControlFile->checkPoint.xlogid &&
|
|
curInsert.xrecoff == ControlFile->checkPoint.xrecoff +
|
|
MAXALIGN(SizeOfXLogRecord + sizeof(CheckPoint)) &&
|
|
ControlFile->checkPoint.xlogid ==
|
|
ControlFile->checkPointCopy.redo.xlogid &&
|
|
ControlFile->checkPoint.xrecoff ==
|
|
ControlFile->checkPointCopy.redo.xrecoff)
|
|
{
|
|
S_UNLOCK(&(XLogCtl->insert_lck));
|
|
S_UNLOCK(&(XLogCtl->chkp_lck));
|
|
END_CRIT_SECTION();
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Compute new REDO record ptr = location of next XLOG record.
|
|
*
|
|
* NB: this is NOT necessarily where the checkpoint record itself will
|
|
* be, since other backends may insert more XLOG records while we're
|
|
* off doing the buffer flush work. Those XLOG records are logically
|
|
* after the checkpoint, even though physically before it. Got that?
|
|
*/
|
|
freespace = INSERT_FREESPACE(Insert);
|
|
if (freespace < SizeOfXLogRecord)
|
|
{
|
|
(void) AdvanceXLInsertBuffer();
|
|
/* OK to ignore update return flag, since we will do flush anyway */
|
|
freespace = BLCKSZ - SizeOfXLogPHD;
|
|
}
|
|
INSERT_RECPTR(checkPoint.redo, Insert, Insert->curridx);
|
|
/*
|
|
* Here we update the shared RedoRecPtr for future XLogInsert calls;
|
|
* this must be done while holding the insert lock.
|
|
*/
|
|
RedoRecPtr = XLogCtl->Insert.RedoRecPtr = checkPoint.redo;
|
|
/*
|
|
* Get UNDO record ptr - this is oldest of PROC->logRec values.
|
|
* We do this while holding insert lock to ensure that we won't miss
|
|
* any about-to-commit transactions (UNDO must include all xacts that
|
|
* have commits after REDO point).
|
|
*/
|
|
checkPoint.undo = GetUndoRecPtr();
|
|
|
|
if (shutdown && checkPoint.undo.xrecoff != 0)
|
|
elog(STOP, "Active transaction while data base is shutting down");
|
|
|
|
/*
|
|
* Now we can release insert lock, allowing other xacts to proceed
|
|
* even while we are flushing disk buffers.
|
|
*/
|
|
S_UNLOCK(&(XLogCtl->insert_lck));
|
|
|
|
SpinAcquire(XidGenLockId);
|
|
checkPoint.nextXid = ShmemVariableCache->nextXid;
|
|
if (!shutdown)
|
|
checkPoint.nextXid += ShmemVariableCache->xidCount;
|
|
SpinRelease(XidGenLockId);
|
|
|
|
SpinAcquire(OidGenLockId);
|
|
checkPoint.nextOid = ShmemVariableCache->nextOid;
|
|
if (!shutdown)
|
|
checkPoint.nextOid += ShmemVariableCache->oidCount;
|
|
SpinRelease(OidGenLockId);
|
|
|
|
/*
|
|
* Having constructed the checkpoint record, ensure all shmem disk buffers
|
|
* are flushed to disk.
|
|
*/
|
|
FlushBufferPool();
|
|
|
|
/*
|
|
* Now insert the checkpoint record into XLOG.
|
|
*/
|
|
rdata.buffer = InvalidBuffer;
|
|
rdata.data = (char *)(&checkPoint);
|
|
rdata.len = sizeof(checkPoint);
|
|
rdata.next = NULL;
|
|
|
|
recptr = XLogInsert(RM_XLOG_ID,
|
|
shutdown ? XLOG_CHECKPOINT_SHUTDOWN :
|
|
XLOG_CHECKPOINT_ONLINE,
|
|
&rdata);
|
|
|
|
XLogFlush(recptr);
|
|
|
|
/*
|
|
* We now have ProcLastRecPtr = start of actual checkpoint record,
|
|
* recptr = end of actual checkpoint record.
|
|
*/
|
|
if (shutdown && !XLByteEQ(checkPoint.redo, ProcLastRecPtr))
|
|
elog(STOP, "XLog concurrent activity while data base is shutting down");
|
|
|
|
/*
|
|
* Remember location of prior checkpoint's earliest info.
|
|
* Oldest item is redo or undo, whichever is older; but watch out
|
|
* for case that undo = 0.
|
|
*/
|
|
if (ControlFile->checkPointCopy.undo.xrecoff != 0 &&
|
|
XLByteLT(ControlFile->checkPointCopy.undo,
|
|
ControlFile->checkPointCopy.redo))
|
|
XLByteToSeg(ControlFile->checkPointCopy.undo, _logId, _logSeg);
|
|
else
|
|
XLByteToSeg(ControlFile->checkPointCopy.redo, _logId, _logSeg);
|
|
|
|
/*
|
|
* Update the control file.
|
|
*/
|
|
SpinAcquire(ControlFileLockId);
|
|
if (shutdown)
|
|
ControlFile->state = DB_SHUTDOWNED;
|
|
ControlFile->prevCheckPoint = ControlFile->checkPoint;
|
|
ControlFile->checkPoint = ProcLastRecPtr;
|
|
ControlFile->checkPointCopy = checkPoint;
|
|
ControlFile->time = time(NULL);
|
|
UpdateControlFile();
|
|
SpinRelease(ControlFileLockId);
|
|
|
|
/*
|
|
* Delete offline log files (those no longer needed even for previous
|
|
* checkpoint).
|
|
*/
|
|
if (_logId || _logSeg)
|
|
{
|
|
PrevLogSeg(_logId, _logSeg);
|
|
MoveOfflineLogs(_logId, _logSeg);
|
|
}
|
|
|
|
/*
|
|
* Make more log segments if needed. (Do this after deleting offline
|
|
* log segments, to avoid having peak disk space usage higher than
|
|
* necessary.)
|
|
*/
|
|
if (!shutdown)
|
|
PreallocXlogFiles(recptr);
|
|
|
|
S_UNLOCK(&(XLogCtl->chkp_lck));
|
|
|
|
END_CRIT_SECTION();
|
|
}
|
|
|
|
/*
|
|
* Write a NEXTXID log record
|
|
*/
|
|
void
|
|
XLogPutNextXid(TransactionId nextXid)
|
|
{
|
|
XLogRecData rdata;
|
|
|
|
rdata.buffer = InvalidBuffer;
|
|
rdata.data = (char *)(&nextXid);
|
|
rdata.len = sizeof(TransactionId);
|
|
rdata.next = NULL;
|
|
(void) XLogInsert(RM_XLOG_ID, XLOG_NEXTXID, &rdata);
|
|
}
|
|
|
|
/*
|
|
* Write a NEXTOID log record
|
|
*/
|
|
void
|
|
XLogPutNextOid(Oid nextOid)
|
|
{
|
|
XLogRecData rdata;
|
|
|
|
rdata.buffer = InvalidBuffer;
|
|
rdata.data = (char *)(&nextOid);
|
|
rdata.len = sizeof(Oid);
|
|
rdata.next = NULL;
|
|
(void) XLogInsert(RM_XLOG_ID, XLOG_NEXTOID, &rdata);
|
|
}
|
|
|
|
/*
|
|
* XLOG resource manager's routines
|
|
*/
|
|
void
|
|
xlog_redo(XLogRecPtr lsn, XLogRecord *record)
|
|
{
|
|
uint8 info = record->xl_info & ~XLR_INFO_MASK;
|
|
|
|
if (info == XLOG_NEXTXID)
|
|
{
|
|
TransactionId nextXid;
|
|
|
|
memcpy(&nextXid, XLogRecGetData(record), sizeof(TransactionId));
|
|
if (ShmemVariableCache->nextXid < nextXid)
|
|
{
|
|
ShmemVariableCache->nextXid = nextXid;
|
|
ShmemVariableCache->xidCount = 0;
|
|
}
|
|
}
|
|
else if (info == XLOG_NEXTOID)
|
|
{
|
|
Oid nextOid;
|
|
|
|
memcpy(&nextOid, XLogRecGetData(record), sizeof(Oid));
|
|
if (ShmemVariableCache->nextOid < nextOid)
|
|
{
|
|
ShmemVariableCache->nextOid = nextOid;
|
|
ShmemVariableCache->oidCount = 0;
|
|
}
|
|
}
|
|
else if (info == XLOG_CHECKPOINT_SHUTDOWN)
|
|
{
|
|
CheckPoint checkPoint;
|
|
|
|
memcpy(&checkPoint, XLogRecGetData(record), sizeof(CheckPoint));
|
|
/* In a SHUTDOWN checkpoint, believe the counters exactly */
|
|
ShmemVariableCache->nextXid = checkPoint.nextXid;
|
|
ShmemVariableCache->xidCount = 0;
|
|
ShmemVariableCache->nextOid = checkPoint.nextOid;
|
|
ShmemVariableCache->oidCount = 0;
|
|
}
|
|
else if (info == XLOG_CHECKPOINT_ONLINE)
|
|
{
|
|
CheckPoint checkPoint;
|
|
|
|
memcpy(&checkPoint, XLogRecGetData(record), sizeof(CheckPoint));
|
|
/* In an ONLINE checkpoint, treat the counters like NEXTXID/NEXTOID */
|
|
if (ShmemVariableCache->nextXid < checkPoint.nextXid)
|
|
{
|
|
ShmemVariableCache->nextXid = checkPoint.nextXid;
|
|
ShmemVariableCache->xidCount = 0;
|
|
}
|
|
if (ShmemVariableCache->nextOid < checkPoint.nextOid)
|
|
{
|
|
ShmemVariableCache->nextOid = checkPoint.nextOid;
|
|
ShmemVariableCache->oidCount = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
xlog_undo(XLogRecPtr lsn, XLogRecord *record)
|
|
{
|
|
}
|
|
|
|
void
|
|
xlog_desc(char *buf, uint8 xl_info, char* rec)
|
|
{
|
|
uint8 info = xl_info & ~XLR_INFO_MASK;
|
|
|
|
if (info == XLOG_CHECKPOINT_SHUTDOWN ||
|
|
info == XLOG_CHECKPOINT_ONLINE)
|
|
{
|
|
CheckPoint *checkpoint = (CheckPoint*) rec;
|
|
sprintf(buf + strlen(buf), "checkpoint: redo %u/%u; undo %u/%u; "
|
|
"sui %u; xid %u; oid %u; %s",
|
|
checkpoint->redo.xlogid, checkpoint->redo.xrecoff,
|
|
checkpoint->undo.xlogid, checkpoint->undo.xrecoff,
|
|
checkpoint->ThisStartUpID, checkpoint->nextXid,
|
|
checkpoint->nextOid,
|
|
(info == XLOG_CHECKPOINT_SHUTDOWN) ? "shutdown" : "online");
|
|
}
|
|
else if (info == XLOG_NEXTXID)
|
|
{
|
|
TransactionId nextXid;
|
|
|
|
memcpy(&nextXid, rec, sizeof(TransactionId));
|
|
sprintf(buf + strlen(buf), "nextXid: %u", nextXid);
|
|
}
|
|
else if (info == XLOG_NEXTOID)
|
|
{
|
|
Oid nextOid;
|
|
|
|
memcpy(&nextOid, rec, sizeof(Oid));
|
|
sprintf(buf + strlen(buf), "nextOid: %u", nextOid);
|
|
}
|
|
else
|
|
strcat(buf, "UNKNOWN");
|
|
}
|
|
|
|
static void
|
|
xlog_outrec(char *buf, XLogRecord *record)
|
|
{
|
|
int bkpb;
|
|
int i;
|
|
|
|
sprintf(buf + strlen(buf), "prev %u/%u; xprev %u/%u; xid %u",
|
|
record->xl_prev.xlogid, record->xl_prev.xrecoff,
|
|
record->xl_xact_prev.xlogid, record->xl_xact_prev.xrecoff,
|
|
record->xl_xid);
|
|
|
|
for (i = 0, bkpb = 0; i < XLR_MAX_BKP_BLOCKS; i++)
|
|
{
|
|
if (!(record->xl_info & (XLR_SET_BKP_BLOCK(i))))
|
|
continue;
|
|
bkpb++;
|
|
}
|
|
|
|
if (bkpb)
|
|
sprintf(buf + strlen(buf), "; bkpb %d", bkpb);
|
|
|
|
sprintf(buf + strlen(buf), ": %s",
|
|
RmgrTable[record->xl_rmid].rm_name);
|
|
}
|
|
|
|
|
|
/*
|
|
* GUC support routines
|
|
*/
|
|
|
|
bool
|
|
check_xlog_sync_method(const char *method)
|
|
{
|
|
if (strcasecmp(method, "fsync") == 0) return true;
|
|
#ifdef HAVE_FDATASYNC
|
|
if (strcasecmp(method, "fdatasync") == 0) return true;
|
|
#endif
|
|
#ifdef OPEN_SYNC_FLAG
|
|
if (strcasecmp(method, "open_sync") == 0) return true;
|
|
#endif
|
|
#ifdef OPEN_DATASYNC_FLAG
|
|
if (strcasecmp(method, "open_datasync") == 0) return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
void
|
|
assign_xlog_sync_method(const char *method)
|
|
{
|
|
int new_sync_method;
|
|
int new_sync_bit;
|
|
|
|
if (strcasecmp(method, "fsync") == 0)
|
|
{
|
|
new_sync_method = SYNC_METHOD_FSYNC;
|
|
new_sync_bit = 0;
|
|
}
|
|
#ifdef HAVE_FDATASYNC
|
|
else if (strcasecmp(method, "fdatasync") == 0)
|
|
{
|
|
new_sync_method = SYNC_METHOD_FDATASYNC;
|
|
new_sync_bit = 0;
|
|
}
|
|
#endif
|
|
#ifdef OPEN_SYNC_FLAG
|
|
else if (strcasecmp(method, "open_sync") == 0)
|
|
{
|
|
new_sync_method = SYNC_METHOD_OPEN;
|
|
new_sync_bit = OPEN_SYNC_FLAG;
|
|
}
|
|
#endif
|
|
#ifdef OPEN_DATASYNC_FLAG
|
|
else if (strcasecmp(method, "open_datasync") == 0)
|
|
{
|
|
new_sync_method = SYNC_METHOD_OPEN;
|
|
new_sync_bit = OPEN_DATASYNC_FLAG;
|
|
}
|
|
#endif
|
|
else
|
|
{
|
|
/* Can't get here unless guc.c screwed up */
|
|
elog(ERROR, "Bogus xlog sync method %s", method);
|
|
new_sync_method = 0; /* keep compiler quiet */
|
|
new_sync_bit = 0;
|
|
}
|
|
|
|
if (sync_method != new_sync_method || open_sync_bit != new_sync_bit)
|
|
{
|
|
/*
|
|
* To ensure that no blocks escape unsynced, force an fsync on
|
|
* the currently open log segment (if any). Also, if the open
|
|
* flag is changing, close the log file so it will be reopened
|
|
* (with new flag bit) at next use.
|
|
*/
|
|
if (openLogFile >= 0)
|
|
{
|
|
if (pg_fsync(openLogFile) != 0)
|
|
elog(STOP, "fsync(logfile %u seg %u) failed: %m",
|
|
openLogId, openLogSeg);
|
|
if (open_sync_bit != new_sync_bit)
|
|
{
|
|
if (close(openLogFile) != 0)
|
|
elog(STOP, "close(logfile %u seg %u) failed: %m",
|
|
openLogId, openLogSeg);
|
|
openLogFile = -1;
|
|
}
|
|
}
|
|
sync_method = new_sync_method;
|
|
open_sync_bit = new_sync_bit;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Issue appropriate kind of fsync (if any) on the current XLOG output file
|
|
*/
|
|
static void
|
|
issue_xlog_fsync(void)
|
|
{
|
|
switch (sync_method)
|
|
{
|
|
case SYNC_METHOD_FSYNC:
|
|
if (pg_fsync(openLogFile) != 0)
|
|
elog(STOP, "fsync(logfile %u seg %u) failed: %m",
|
|
openLogId, openLogSeg);
|
|
break;
|
|
#ifdef HAVE_FDATASYNC
|
|
case SYNC_METHOD_FDATASYNC:
|
|
if (pg_fdatasync(openLogFile) != 0)
|
|
elog(STOP, "fdatasync(logfile %u seg %u) failed: %m",
|
|
openLogId, openLogSeg);
|
|
break;
|
|
#endif
|
|
case SYNC_METHOD_OPEN:
|
|
/* write synced it already */
|
|
break;
|
|
default:
|
|
elog(STOP, "bogus sync_method %d", sync_method);
|
|
break;
|
|
}
|
|
}
|