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data.c
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/*-------------------------------------------------------------------------
*
* data.c: utilities for backing up and restoring database files along with
* the support for compression/decompression of individual data file pages
*
* Copyright (c) 2009-2019, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
*-------------------------------------------------------------------------
*/
#include "pg_rman.h"
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "catalog/pg_control.h"
#include "common/controldata_utils.h"
#include "libpq/pqsignal.h"
#include "storage/block.h"
#include "storage/bufpage.h"
#include "storage/checksum.h"
#include "storage/checksum_impl.h"
#include "idxpagehdr.h"
#ifdef HAVE_LIBZ
#include <zlib.h>
#define zlibOutSize 4096
#define zlibInSize 4096
static int doDeflate(z_stream *zp, size_t in_size, size_t out_size, void *inbuf,
void *outbuf, FILE *in, FILE *out, pg_crc32c *crc, size_t *write_size,
int flash);
static int doInflate(z_stream *zp, size_t in_size, size_t out_size,void *inbuf,
void *outbuf, FILE *in, FILE *out, pg_crc32c *crc, size_t *read_size);
static BlockNumber figure_out_segno(char *filepath);
static int
doDeflate(z_stream *zp, size_t in_size, size_t out_size, void *inbuf,
void *outbuf, FILE *in, FILE *out, pg_crc32c *crc, size_t *write_size,
int flash)
{
int status;
zp->next_in = inbuf;
zp->avail_in = in_size;
/* compresses until an input buffer becomes empty. */
do
{
if (interrupted)
{
if (in)
fclose(in);
fclose(out);
ereport(FATAL,
(errcode(ERROR_INTERRUPTED),
errmsg("interrupted during deflate")));
}
status = deflate(zp, flash);
if (status == Z_STREAM_ERROR)
{
if (in)
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not compress data: %s", zp->msg)));
}
if (fwrite(outbuf, 1, out_size - zp->avail_out, out) !=
out_size - zp->avail_out)
{
if (in)
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not write file: %s", strerror(errno))));
}
/* update CRC */
PGRMAN_COMP_CRC32(*crc, outbuf, out_size - zp->avail_out);
*write_size += out_size - zp->avail_out;
zp->next_out = outbuf;
zp->avail_out = out_size;
} while (zp->avail_in != 0);
return status;
}
static int
doInflate(z_stream *zp, size_t in_size, size_t out_size,void *inbuf,
void *outbuf, FILE *in, FILE *out, pg_crc32c *crc, size_t *read_size)
{
int status = Z_OK;
zp->next_out = outbuf;
zp->avail_out = out_size;
/* decompresses until an output buffer becomes full. */
for (;;)
{
if (interrupted)
ereport(FATAL,
(errcode(ERROR_INTERRUPTED),
errmsg("interrupted during inflate")));
/* input buffer becomes empty, read it from a file. */
if (zp->avail_in == 0)
{
size_t read_len;
read_len = fread(inbuf, 1, in_size, in);
if (read_len != in_size)
{
int errno_tmp = errno;
if (!feof(in))
{
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_CORRUPTED),
errmsg("could not read compress file: %s", strerror(errno_tmp))));
}
if (read_len == 0 && *read_size == 0)
return Z_STREAM_END;
}
zp->next_in = inbuf;
zp->avail_in = read_len;
*read_size += read_len;
}
/* decompresses input file data */
status = inflate(zp, Z_NO_FLUSH);
if (status == Z_STREAM_END)
{
if (feof(in))
break;
/* not reached to EOF, read again */
}
else if (status == Z_OK)
{
if (zp->avail_out == 0)
break;
/* more input needed to fill out_buf */
}
else if (status != Z_OK)
{
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not uncompress data: %s", strerror(errno))));
}
}
/* update CRC */
PGRMAN_COMP_CRC32(*crc, outbuf, out_size - zp->avail_out);
return status;
}
#endif
/*
* One page read from a data file.
*/
typedef union DataPage
{
/* Page header for quick access */
PageHeaderData header;
/*
* The whole page (execpt the portion deemed unnecessary (hole), all of
* it is written to the backup as is.
*/
char data[BLCKSZ];
} DataPage;
/*
* From the page header of the actual PostgreSQL data page, extract
* information that is written to the backup as part of BackupPageHeader.
*
* Returns true if contents of *page are recognized as a valid data page
* so that it's written in the pg_rman-specific backup format. Otherwise,
* false is returned so that caller can simply copy the page as is
* without performing any additional processing.
*
* XXX - If we are are able to determine that a page coming from the 0th
* block of a file is a GIN metapage, we return false to ask the caller
* to copy the whole file.
*/
static bool
parse_page(int blkno,
const DataPage *page,
XLogRecPtr *lsn,
uint16 *offset,
uint16 *length)
{
const PageHeaderData *header = (PageHeaderData *) &page->header;
const Page pagedata = (Page) page->data;
/*
* Combine 2-part LSN into a single 64-bit value to match the new
* XLogRecPtr definition in 9.3+
*/
*lsn = PageXLogRecPtrGet(header->pd_lsn);
if (PageGetPageSize(header) == BLCKSZ &&
PageGetPageLayoutVersion(header) == PG_PAGE_LAYOUT_VERSION &&
(header->pd_flags & ~PD_VALID_FLAG_BITS) == 0 &&
header->pd_lower >= SizeOfPageHeaderData &&
header->pd_lower <= header->pd_upper &&
header->pd_upper <= header->pd_special &&
header->pd_special <= BLCKSZ &&
header->pd_special == MAXALIGN(header->pd_special) &&
!XLogRecPtrIsInvalid(*lsn))
{
/*
* Caller's optimization will break metapage content of certain index
* types, so it's better to ask the caller to not do it.
*/
if (IS_GIN_INDEX_METAPAGE(blkno, pagedata) ||
IS_BRIN_INDEX_METAPAGE(blkno, pagedata) ||
IS_SPGIST_INDEX_METAPAGE(blkno, pagedata))
{
*offset = *length = 0;
return false;
}
*offset = header->pd_lower;
*length = header->pd_upper - header->pd_lower;
return true;
}
*offset = *length = 0;
return false;
}
/*
* Backup data file in the from_root directory to the to_root directory with
* same relative path.
* If lsn is not NULL, pages only which are modified after the lsn will be
* copied.
*/
bool
backup_data_file(const char *from_root,
const char *to_root,
pgFile *file,
const XLogRecPtr *lsn,
bool compress,
bool prev_file_not_found)
{
char to_path[MAXPGPATH];
FILE *in;
FILE *out;
BackupPageHeader header;
DataPage page; /* used as read buffer */
BlockNumber blknum;
BlockNumber segno;
size_t read_len;
int errno_tmp;
pg_crc32c crc;
#ifdef HAVE_LIBZ
z_stream z;
char outbuf[zlibOutSize];
#endif
PGRMAN_INIT_CRC32(crc);
/* reset size summary */
file->read_size = 0;
file->write_size = 0;
/* open backup mode file for read */
in = fopen(file->path, "r");
if (in == NULL)
{
PGRMAN_FIN_CRC32(crc);
file->crc = crc;
/* maybe vanished, it's not error */
if (errno == ENOENT)
return false;
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open backup mode file \"%s\": %s",
file->path, strerror(errno))));
}
/* open backup file for write */
if (check)
snprintf(to_path, lengthof(to_path), "%s/tmp", backup_path);
else
join_path_components(to_path, to_root, file->path + strlen(from_root) + 1);
out = fopen(to_path, "w");
if (out == NULL)
{
int errno_tmp = errno;
fclose(in);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open backup file \"%s\": %s", to_path, strerror(errno_tmp))));
}
#ifdef HAVE_LIBZ
if (compress)
{
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
if (deflateInit(&z, Z_DEFAULT_COMPRESSION) != Z_OK)
{
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not initialize compression library: %s", z.msg)));
}
z.avail_in = 0;
z.next_out = (void *) outbuf;
z.avail_out = zlibOutSize;
}
#endif
/*
* If this data file is a non-initial segment of a multi-segment relation,
* we must use the correct blkno for the checksum calculation to proceed
* sanely. No need to be accurate if the checksum won't matter.
*/
if (data_checksum_enabled)
segno = figure_out_segno(file->path);
else
segno = 0;
/* read each page and write the page excluding hole */
for (blknum = 0;
(read_len = fread(&page, 1, sizeof(page), in)) == sizeof(page);
++blknum)
{
XLogRecPtr page_lsn;
int upper_offset;
int upper_length;
header.block = blknum;
header.endpoint = false;
/*
* If a invalid data page was found, fallback to simple copy to ensure
* all pages in the file don't have BackupPageHeader.
*/
if (!parse_page(blknum, &page, &page_lsn, &header.hole_offset,
&header.hole_length))
{
if (verbose)
elog(DEBUG, "%s fall back to simple copy", file->path);
fclose(in);
fclose(out);
file->is_datafile = false;
return copy_file(from_root, to_root, file,
compress ? COMPRESSION : NO_COMPRESSION);
}
file->read_size += read_len;
/* if the page has not been modified since last backup, skip it */
if (!prev_file_not_found && lsn && !XLogRecPtrIsInvalid(page_lsn) && page_lsn < *lsn)
continue;
/*
* Re-calculate checksum disregarding the hole portion of the page
* and overwrite the value curently present in pd_checksum.
*
* Note: Zero'ing the hole portion is necessary, because that's what
* it will contain once the page is restored into the target
* database.
*/
memset(page.data + header.hole_offset, 0, header.hole_length);
if (data_checksum_enabled)
((PageHeader) page.data)->pd_checksum =
pg_checksum_page((char *) page.data,
blknum + RELSEG_SIZE * segno);
upper_offset = header.hole_offset + header.hole_length;
upper_length = BLCKSZ - upper_offset;
#ifdef HAVE_LIBZ
if (compress)
{
doDeflate(&z, sizeof(header), sizeof(outbuf), &header, outbuf, in,
out, &crc, &file->write_size, Z_NO_FLUSH);
doDeflate(&z, header.hole_offset, sizeof(outbuf), page.data, outbuf,
in, out, &crc, &file->write_size, Z_NO_FLUSH);
doDeflate(&z, upper_length, sizeof(outbuf),
page.data + upper_offset, outbuf, in, out, &crc,
&file->write_size, Z_NO_FLUSH);
}
else
#endif
{
/* write data page excluding hole */
if (fwrite(&header, 1, sizeof(header), out) != sizeof(header) ||
fwrite(page.data, 1, header.hole_offset, out) != header.hole_offset ||
fwrite(page.data + upper_offset, 1, upper_length, out) != upper_length)
{
int errno_tmp = errno;
/* oops */
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not write at block %u of \"%s\": %s",
blknum, to_path, strerror(errno_tmp))));
}
/* update CRC */
PGRMAN_COMP_CRC32(crc, &header, sizeof(header));
PGRMAN_COMP_CRC32(crc, page.data, header.hole_offset);
PGRMAN_COMP_CRC32(crc, page.data + upper_offset, upper_length);
file->write_size += sizeof(header) + read_len - header.hole_length;
}
}
errno_tmp = errno;
if (!feof(in))
{
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not read backup mode file \"%s\": %s", file->path, strerror(errno_tmp))));
}
/*
* The odd size page at the tail is probably a page exactly written now, so
* write whole of it.
*/
if (read_len > 0)
{
/*
* If the odd size page is the 1st page, fallback to simple copy because
* the file is not a datafile.
* Otherwise treat the page as a datapage with no hole.
*/
if (blknum == 0)
file->is_datafile = false;
else
{
header.block = blknum;
header.hole_offset = 0;
header.hole_length = 0;
#ifdef HAVE_LIBZ
if (compress)
doDeflate(&z, sizeof(header), sizeof(outbuf), &header, outbuf,
in, out, &crc, &file->write_size, Z_NO_FLUSH);
else
#endif
{
if (fwrite(&header, 1, sizeof(header), out) != sizeof(header))
{
int errno_tmp = errno;
/* oops */
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not write at block %u of \"%s\": %s",
blknum, to_path, strerror(errno_tmp))));
}
PGRMAN_COMP_CRC32(crc, &header, sizeof(header));
file->write_size += sizeof(header);
}
}
/* write odd size page image */
#ifdef HAVE_LIBZ
if (compress)
doDeflate(&z, read_len, sizeof(outbuf), page.data, outbuf, in, out,
&crc, &file->write_size, Z_NO_FLUSH);
else
#endif
{
if (fwrite(page.data, 1, read_len, out) != read_len)
{
int errno_tmp = errno;
/* oops */
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not write at block %u of \"%s\": %s",
blknum, to_path, strerror(errno_tmp))));
}
PGRMAN_COMP_CRC32(crc, page.data, read_len);
file->write_size += read_len;
}
file->read_size += read_len;
}
/*
* In incremental backup mode, append a special page header, with
* endpoint field set to true, to mark the end of relation as of this
* backup.
* This is used when restoring the backup, to truncate any subsequent
* pages that may be present in the previous full backup.
* In incremental backup mode, put the endpoint to remember the last
* block number.
*/
if (current.backup_mode == BACKUP_MODE_INCREMENTAL)
{
header.block = ++blknum;
header.endpoint = true;
#ifdef HAVE_LIBZ
if (compress)
{
doDeflate(&z, sizeof(header), sizeof(outbuf), &header, outbuf, in,
out, &crc, &file->write_size, Z_NO_FLUSH);
}
else
#endif
{
if (fwrite(&header, 1, sizeof(header), out) != sizeof(header))
{
int errno_tmp = errno;
/* oops */
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not write at block %u of \"%s\": %s to put endpoint",
blknum, to_path, strerror(errno_tmp))));
}
PGRMAN_COMP_CRC32(crc, &header, sizeof(header));
file->write_size += sizeof(header);
}
}
#ifdef HAVE_LIBZ
if (compress)
{
/*
* finalize zstream.
*
* NOTE: We need to do this even if we didn't read anything from the
* file but still had to write the special page header.
*/
if (file->read_size > 0 || header.endpoint)
{
while (doDeflate(&z, 0, sizeof(outbuf), NULL, outbuf, in, out, &crc,
&file->write_size, Z_FINISH) != Z_STREAM_END)
{
}
}
if (deflateEnd(&z) != Z_OK)
{
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not close compression stream: %s", z.msg)));
}
}
#endif
/*
* update file permission
* FIXME: Should set permission on open?
*/
if (!check && chmod(to_path, FILE_PERMISSION) == -1)
{
int errno_tmp = errno;
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not change mode of \"%s\": %s", file->path, strerror(errno_tmp))));
}
fclose(in);
fclose(out);
/* finish CRC calculation and store into pgFile */
PGRMAN_FIN_CRC32(crc);
file->crc = crc;
/* Treat empty file as not-datafile */
if (file->read_size == 0)
file->is_datafile = false;
/* We do not backup if all pages skipped. */
if (file->write_size == 0 && file->read_size > 0)
{
if (remove(to_path) == -1)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not remove file \"%s\": %s", to_path, strerror(errno))));
return false;
}
/* remove $BACKUP_PATH/tmp created during check */
if (check)
remove(to_path);
return true;
}
/*
* Restore files in the from_root directory to the to_root directory with
* same relative path.
*/
void
restore_data_file(const char *from_root,
const char *to_root,
pgFile *file,
bool compress)
{
char to_path[MAXPGPATH];
FILE *in;
FILE *out;
BackupPageHeader header;
BlockNumber blknum;
#ifdef HAVE_LIBZ
z_stream z;
int status;
char inbuf[zlibInSize];
pg_crc32c crc;
size_t read_size;
#endif
/* If the file is not a datafile, just copy it. */
if (!file->is_datafile)
{
copy_file(from_root, to_root, file,
compress ? DECOMPRESSION : NO_COMPRESSION);
return;
}
/* open backup mode file for read */
in = fopen(file->path, "r");
if (in == NULL)
{
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open backup file \"%s\": %s", file->path,
strerror(errno))));
}
/*
* Open backup file for write. We use "r+" at first to overwrite only
* modified pages for incremental restore. If the file is not exists,
* re-open it with "w" to create an empty file.
*/
join_path_components(to_path, to_root, file->path + strlen(from_root) + 1);
out = fopen(to_path, "r+");
if (out == NULL && errno == ENOENT)
out = fopen(to_path, "w");
if (out == NULL)
{
int errno_tmp = errno;
fclose(in);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open restore target file \"%s\": %s",
to_path, strerror(errno_tmp))));
}
#ifdef HAVE_LIBZ
if (compress)
{
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
z.next_in = Z_NULL;
z.avail_in = 0;
if (inflateInit(&z) != Z_OK)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not initialize compression library: %s", z.msg)));
PGRMAN_INIT_CRC32(crc);
read_size = 0;
}
#endif
for (blknum = 0; ; blknum++)
{
size_t read_len;
DataPage page; /* used as read buffer */
int upper_offset;
int upper_length;
/* read BackupPageHeader */
#ifdef HAVE_LIBZ
if (compress)
{
status = doInflate(&z, sizeof(inbuf), sizeof(header), inbuf,
&header, in, out, &crc, &read_size);
/* when the stream ends, proceed to next block unless the block is
* flagged as endpoint, which needs an additional truncation process.*/
if (status == Z_STREAM_END && !header.endpoint)
{
if (z.avail_out != sizeof(header))
ereport(ERROR,
(errcode(ERROR_CORRUPTED),
errmsg("backup has a broken header")));
break;
}
if (z.avail_out != 0)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not read block %u of \"%s\"", blknum, file->path)));
}
else
#endif
{
read_len = fread(&header, 1, sizeof(header), in);
if (read_len != sizeof(header))
{
int errno_tmp = errno;
if (read_len == 0 && feof(in))
break; /* EOF found */
else if (read_len != 0 && feof(in))
ereport(ERROR,
(errcode(ERROR_CORRUPTED),
errmsg("odd size page found at block %u of \"%s\"",
blknum, file->path)));
else
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not read block %u of \"%s\": %s",
blknum, file->path, strerror(errno_tmp))));
}
}
if (header.endpoint)
{
/*
* endpoint means there are no pages any more at the point of
* incremental backup, so truncate it.
* This process is necessary for preventing unexpected deleted
* data comeback which happens when a vacuum shrink relations
* between a full backup and an incremental backup.
*/
blknum = header.block;
elog(DEBUG, "truncating file. %s blknum: %d", to_path, blknum);
truncate(to_path, (blknum - 1) * BLCKSZ);
break;
}
if (header.block < blknum || header.hole_offset > BLCKSZ ||
(int) header.hole_offset + (int) header.hole_length > BLCKSZ)
ereport(ERROR,
(errcode(ERROR_CORRUPTED),
errmsg("backup is broken at block %u", blknum)));
upper_offset = header.hole_offset + header.hole_length;
upper_length = BLCKSZ - upper_offset;
/* read lower/upper into page.data and restore hole */
memset(page.data + header.hole_offset, 0, header.hole_length);
#ifdef HAVE_LIBZ
if (compress)
{
if (verbose)
elog(DEBUG, "starting decompress file: %s", file->path);
if (header.hole_offset > 0)
{
doInflate(&z, sizeof(inbuf), header.hole_offset, inbuf,
page.data, in, out, &crc, &read_size);
if (z.avail_out != 0)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not read block %u of \"%s\"", blknum, file->path)));
}
if (upper_length > 0)
{
doInflate(&z, sizeof(inbuf), upper_length, inbuf,
page.data + upper_offset, in, out, &crc, &read_size);
if (z.avail_out != 0)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not read block %u of \"%s\"", blknum, file->path)));
}
}
else
#endif
{
if (fread(page.data, 1, header.hole_offset, in) != header.hole_offset ||
fread(page.data + upper_offset, 1, upper_length, in) != upper_length)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not read block %u of \"%s\": %s",
blknum, file->path, strerror(errno))));
}
/*
* Seek and write the restored page. Backup might have holes in
* incremental backups.
*/
blknum = header.block;
if (fseek(out, blknum * BLCKSZ, SEEK_SET) < 0)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not seek block %u of \"%s\": %s",
blknum, to_path, strerror(errno))));
/*
* Note that a valid checksum was already set by backup_data_file(),
* considering the zero'ing of the hole. See comments in that
* function.
*/
if (fwrite(page.data, 1, sizeof(page), out) != sizeof(page))
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not write block %u of \"%s\": %s",
blknum, file->path, strerror(errno))));
}
#ifdef HAVE_LIBZ
if (compress && inflateEnd(&z) != Z_OK)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not close compression stream: %s", z.msg)));
#endif
/* update file permission */
if (chmod(to_path, file->mode) == -1)
{
int errno_tmp = errno;
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not change mode of \"%s\": %s", to_path,
strerror(errno_tmp))));
}
fclose(in);
fclose(out);
}
bool
copy_file(const char *from_root, const char *to_root, pgFile *file,
CompressionMode mode)
{
char to_path[MAXPGPATH];
FILE *in;
FILE *out;
size_t read_len = 0;
int errno_tmp;
char buf[8192];
struct stat st;
pg_crc32c crc;
#ifdef HAVE_LIBZ
z_stream z;
int status;
char outbuf[zlibOutSize];
char inbuf[zlibInSize];
#endif
PGRMAN_INIT_CRC32(crc);
/* reset size summary */
file->read_size = 0;
file->write_size = 0;
/* open backup mode file for read */
in = fopen(file->path, "r");
if (in == NULL)
{
PGRMAN_FIN_CRC32(crc);
file->crc = crc;
/* maybe deleted, it's not error */
if (errno == ENOENT)
return false;
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open source file \"%s\": %s", file->path,
strerror(errno))));
}
/* open backup file for write */
if (check)
snprintf(to_path, lengthof(to_path), "%s/tmp", backup_path);
else
join_path_components(to_path, to_root, file->path + strlen(from_root) + 1);
out = fopen(to_path, "w");
if (out == NULL)
{
int errno_tmp = errno;
fclose(in);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open destination file \"%s\": %s",
to_path, strerror(errno_tmp))));
}
/* stat source file to change mode of destination file */
if (fstat(fileno(in), &st) == -1)
{
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not execute stat \"%s\": %s", file->path, strerror(errno))));
}
#ifdef HAVE_LIBZ
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
if (mode == COMPRESSION)
{
if (deflateInit(&z, Z_DEFAULT_COMPRESSION) != Z_OK)
{
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not initialize compression library: %s", z.msg)));
}
z.avail_in = 0;
z.next_out = (void *) outbuf;
z.avail_out = zlibOutSize;
}
else if (mode == DECOMPRESSION)
{
z.next_in = Z_NULL;
z.avail_in = 0;
if (inflateInit(&z) != Z_OK)
{
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not initialize compression library: %s", z.msg)));
}
}
#endif
/* copy content and calc CRC */
for (;;)
{
#ifdef HAVE_LIBZ
if (mode == COMPRESSION)
{
if ((read_len = fread(buf, 1, sizeof(buf), in)) != sizeof(buf))
break;
doDeflate(&z, read_len, sizeof(outbuf), buf, outbuf, in, out, &crc,
&file->write_size, Z_NO_FLUSH);
file->read_size += sizeof(buf);
}
else if (mode == DECOMPRESSION)
{
status = doInflate(&z, sizeof(inbuf), sizeof(outbuf), inbuf, outbuf,
in, out, &crc, &file->read_size);
if (fwrite(outbuf, 1, sizeof(outbuf) - z.avail_out, out) !=
sizeof(outbuf) - z.avail_out)
{
errno_tmp = errno;
/* oops */
fclose(in);
fclose(out);
ereport(ERROR,
(errcode(ERROR_SYSTEM),