mirror of
https://github.com/postgrespro/pg_probackup.git
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82 lines
1.8 KiB
C
82 lines
1.8 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) 2009-2013, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
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*
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*-------------------------------------------------------------------------
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*/
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#include "pg_arman.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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#include "access/xlog_internal.h"
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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)
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{
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FILE *fp;
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XLogPage page;
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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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/* 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 (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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/*
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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, TimeLineID tli, XLogRecPtr lsn)
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{
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snprintf(fname, MAXFNAMELEN, "%08X%08X%08X", tli,
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(uint32) (lsn >> 32),
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(uint32) (lsn / XLogSegSize));
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}
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