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https://github.com/postgrespro/pg_probackup.git
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4df4b1644f
git-svn-id: http://pg-rman.googlecode.com/svn/trunk@28 182aca00-e38e-11de-a668-6fd11605f5ce
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* xlog.c: Parse WAL files.
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*
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* Copyright (c) 2009-2010, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
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*
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*-------------------------------------------------------------------------
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*/
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#include "pg_rman.h"
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#if PG_VERSION_NUM >= 80400
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typedef unsigned long Datum;
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typedef struct MemoryContextData *MemoryContext;
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#endif
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#include "access/xlog_internal.h"
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#define XLOG_PAGE_MAGIC_v80 0xD05C /* 8.0 */
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#define XLOG_PAGE_MAGIC_v81 0xD05D /* 8.1 */
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#define XLOG_PAGE_MAGIC_v82 0xD05E /* 8.2 */
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#define XLOG_PAGE_MAGIC_v83 0xD062 /* 8.3 */
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#define XLOG_PAGE_MAGIC_v84 0xD063 /* 8.4 */
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#define XLOG_PAGE_MAGIC_v85 0xD166 /* 8.5 */
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/*
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* XLogLongPageHeaderData is modified in 8.3, but the layout is compatible
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* except xlp_xlog_blcksz.
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*/
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typedef union XLogPage
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{
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XLogPageHeaderData header;
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XLogLongPageHeaderData lheader;
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char data[XLOG_BLCKSZ];
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} XLogPage;
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/*
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* Return whether the file is a WAL segment or not.
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* based on ValidXLOGHeader() in src/backend/access/transam/xlog.c.
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*/
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bool
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xlog_is_complete_wal(const pgFile *file, int server_version)
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{
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FILE *fp;
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XLogPage page;
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uint16 xlog_page_magic;
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fp = fopen(file->path, "r");
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if (!fp)
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return false;
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if (fread(&page, 1, sizeof(page), fp) != XLOG_BLCKSZ)
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{
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fclose(fp);
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return false;
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}
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fclose(fp);
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/* xlog_page_magic from server version */
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if (server_version < 80000)
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return false; /* never happen */
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else if (server_version < 80100)
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xlog_page_magic = XLOG_PAGE_MAGIC_v80;
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else if (server_version < 80200)
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xlog_page_magic = XLOG_PAGE_MAGIC_v81;
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else if (server_version < 80300)
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xlog_page_magic = XLOG_PAGE_MAGIC_v82;
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else if (server_version < 80400)
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xlog_page_magic = XLOG_PAGE_MAGIC_v83;
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else if (server_version < 80500)
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xlog_page_magic = XLOG_PAGE_MAGIC_v84;
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else if (server_version < 80600)
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xlog_page_magic = XLOG_PAGE_MAGIC_v85;
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else
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return false; /* not supported */
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/* check header */
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if (page.header.xlp_magic != xlog_page_magic)
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return false;
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if ((page.header.xlp_info & ~XLP_ALL_FLAGS) != 0)
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return false;
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if ((page.header.xlp_info & XLP_LONG_HEADER) == 0)
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return false;
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if (page.lheader.xlp_seg_size != XLogSegSize)
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return false;
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if (server_version >= 80300 && page.lheader.xlp_xlog_blcksz != XLOG_BLCKSZ)
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return false;
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/*
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* check size (actual file size, not backup file size)
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* TODO: Support pre-compressed xlog. They might have different file sizes.
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*/
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if (file->size != XLogSegSize)
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return false;
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return true;
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}
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bool
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xlog_logfname2lsn(const char *logfname, XLogRecPtr *lsn)
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{
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uint32 tli;
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if (sscanf(logfname, "%08X%08X%08X",
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&tli, &lsn->xlogid, &lsn->xrecoff) != 3)
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return false;
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lsn->xrecoff *= XLogSegSize;
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return true;
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}
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/*
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* based on XLogFileName() in xlog_internal.h
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*/
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void
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xlog_fname(char *fname, size_t len, TimeLineID tli, XLogRecPtr *lsn)
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{
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snprintf(fname, len, "%08X%08X%08X", tli,
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lsn->xlogid, lsn->xrecoff / XLogSegSize);
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}
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