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backup.c
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backup.c
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/*-------------------------------------------------------------------------
*
* backup.c: backup DB cluster, archived WAL, serverlog.
*
* Copyright (c) 2009-2011, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
*-------------------------------------------------------------------------
*/
#include "pg_rman.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <dirent.h>
#include <time.h>
#include "libpq/pqsignal.h"
#include "pgut/pgut-port.h"
#define TIMEOUT_ARCHIVE 10 /* wait 10 sec until WAL archive complete */
static bool in_backup = false; /* TODO: more robust logic */
static parray *cleanup_list; /* list of command to execute at error processing for snapshot */
/*
* Backup routines
*/
static void backup_cleanup(bool fatal, void *userdata);
static void delete_old_files(const char *root, parray *files, int keep_files,
int keep_days, int server_version, bool is_arclog);
static void backup_files(const char *from_root, const char *to_root,
parray *files, parray *prev_files, const XLogRecPtr *lsn, bool compress, const char *prefix);
static parray *do_backup_database(parray *backup_list, bool smooth_checkpoint);
static parray *do_backup_arclog(parray *backup_list);
static parray *do_backup_srvlog(parray *backup_list);
static void confirm_block_size(const char *name, int blcksz);
static void pg_start_backup(const char *label, bool smooth, pgBackup *backup);
static void pg_stop_backup(pgBackup *backup);
static void pg_switch_xlog(pgBackup *backup);
static void get_lsn(PGresult *res, TimeLineID *timeline, XLogRecPtr *lsn);
static void get_xid(PGresult *res, uint32 *xid);
static void delete_arclog_link(void);
static void delete_online_wal_backup(void);
static bool fileExists(const char *path);
static bool dirExists(const char *path);
static void execute_freeze(void);
static void execute_unfreeze(void);
static void execute_split(parray *tblspc_list);
static void execute_resync(void);
static void execute_mount(parray *tblspcmp_list);
static void execute_umount(void);
static void execute_script(const char *mode, bool is_cleanup, parray *output);
static void snapshot_cleanup(bool fatal, void *userdata);
static void add_files(parray *files, const char *root, bool add_root, bool is_pgdata);
static int strCompare(const void *str1, const void *str2);
static void create_file_list(parray *files, const char *root, const char *prefix, bool is_append);
/*
* Take a backup of database.
*/
static parray *
do_backup_database(parray *backup_list, bool smooth_checkpoint)
{
int i;
parray *files; /* backup file list from non-snapshot */
parray *prev_files = NULL; /* file list of previous database backup */
FILE *fp;
char path[MAXPGPATH];
char label[1024];
XLogRecPtr *lsn = NULL;
char prev_file_txt[MAXPGPATH]; /* path of the previous backup list file */
if (!HAVE_DATABASE(¤t)) {
/* check if arclog backup. if arclog backup and no suitable full backup, */
/* take full backup instead. */
if (HAVE_ARCLOG(¤t)) {
pgBackup *prev_backup;
/* find last completed database backup */
prev_backup = catalog_get_last_data_backup(backup_list);
if (prev_backup == NULL)
{
elog(ERROR_SYSTEM, _("There is indeed a full backup but it is not validated."
"So I can't take any arclog backup."
"Please validate it and retry."));
/// elog(INFO, _("no previous full backup, performing a full backup instead"));
/// current.backup_mode = BACKUP_MODE_FULL;
}
}
else
return NULL;
}
elog(INFO, _("database backup start"));
/* initialize size summary */
current.total_data_bytes = 0;
current.read_data_bytes = 0;
/* notify start of backup to PostgreSQL server */
time2iso(label, lengthof(label), current.start_time);
strncat(label, " with pg_rman", lengthof(label));
pg_start_backup(label, smooth_checkpoint, ¤t);
/* If backup_label does not exist in $PGDATA, stop taking backup */
snprintf(path, lengthof(path), "%s/backup_label", pgdata);
make_native_path(path);
if (!fileExists(path)) {
if (verbose)
printf(_("backup_label does not exist, stop backup\n"));
pg_stop_backup(NULL);
elog(ERROR_SYSTEM, _("backup_label does not exist in PGDATA."));
}
/*
* list directories and symbolic links with the physical path to make
* mkdirs.sh
* Sort in order of path.
* omit $PGDATA.
*/
files = parray_new();
dir_list_file(files, pgdata, NULL, false, false);
if (!check)
{
pgBackupGetPath(¤t, path, lengthof(path), MKDIRS_SH_FILE);
fp = fopen(path, "wt");
if (fp == NULL)
elog(ERROR_SYSTEM, _("can't open make directory script \"%s\": %s"),
path, strerror(errno));
dir_print_mkdirs_sh(fp, files, pgdata);
fclose(fp);
if (chmod(path, DIR_PERMISSION) == -1)
elog(ERROR_SYSTEM, _("can't change mode of \"%s\": %s"), path,
strerror(errno));
}
/* clear directory list */
parray_walk(files, pgFileFree);
parray_free(files);
files = NULL;
/*
* To take incremental backup, the file list of the last completed database
* backup is needed.
*/
if (current.backup_mode < BACKUP_MODE_FULL)
{
pgBackup *prev_backup;
/* find last completed database backup */
prev_backup = catalog_get_last_data_backup(backup_list);
if (prev_backup == NULL || prev_backup->tli != current.tli)
{
elog(ERROR_SYSTEM, _("There is indeed a full backup but it is not validated."
"So I can't take any incremental backup."
"Please validate it and retry."));
/// elog(INFO, _("no previous full backup, performing a full backup instead"));
/// current.backup_mode = BACKUP_MODE_FULL;
}
else
{
pgBackupGetPath(prev_backup, prev_file_txt, lengthof(prev_file_txt),
DATABASE_FILE_LIST);
prev_files = dir_read_file_list(pgdata, prev_file_txt);
/*
* Do backup only pages having larger LSN than previous backup.
*/
lsn = &prev_backup->start_lsn;
elog(LOG, _("backup only the page that there was of the update from LSN(%X/%08X).\n"),
lsn->xlogid, lsn->xrecoff);
}
}
/* initialize backup list from non-snapshot */
files = parray_new();
join_path_components(path, backup_path, SNAPSHOT_SCRIPT_FILE);
/*
* Check the existence of the snapshot-script.
* backup use snapshot when snapshot-script exists.
*/
if (fileExists(path))
{
parray *tblspc_list; /* list of name of TABLESPACE backup from snapshot */
parray *tblspcmp_list; /* list of mounted directory of TABLESPACE in snapshot volume */
PGresult *tblspc_res; /* contain spcname and oid in TABLESPACE */
tblspc_list = parray_new();
tblspcmp_list = parray_new();
cleanup_list = parray_new();
/*
* append 'pg_tblspc' to list of directory excluded from copy.
* because DB cluster and TABLESPACE are copied separately.
*/
for (i = 0; pgdata_exclude[i]; i++); /* find first empty slot */
pgdata_exclude[i] = PG_TBLSPC_DIR;
/* set the error processing for the snapshot */
pgut_atexit_push(snapshot_cleanup, cleanup_list);
/* create snapshot volume */
if (!check)
{
/* freeze I/O of the file-system */
execute_freeze();
/* create the snapshot, and obtain the name of TABLESPACE backup from snapshot */
execute_split(tblspc_list);
/* unfreeze I/O of the file-system */
execute_unfreeze();
}
/*
* when DB cluster is not contained in the backup from the snapshot,
* DB cluster is added to the backup file list from non-snapshot.
*/
parray_qsort(tblspc_list, strCompare);
if (parray_bsearch(tblspc_list, "PG-DATA", strCompare) == NULL)
add_files(files, pgdata, false, true);
else
/* remove the detected tablespace("PG-DATA") from tblspc_list */
parray_rm(tblspc_list, "PG-DATA", strCompare);
/*
* select the TABLESPACE backup from non-snapshot,
* and append TABLESPACE to the list backup from non-snapshot.
* TABLESPACE name and oid is obtained by inquiring of the database.
*/
reconnect();
tblspc_res = execute("SELECT spcname, oid FROM pg_tablespace WHERE "
"spcname NOT IN ('pg_default', 'pg_global') ORDER BY spcname ASC", 0, NULL);
disconnect();
for (i = 0; i < PQntuples(tblspc_res); i++)
{
char *name = PQgetvalue(tblspc_res, i, 0);
char *oid = PQgetvalue(tblspc_res, i, 1);
/* when not found, append it to the backup list from non-snapshot */
if (parray_bsearch(tblspc_list, name, strCompare) == NULL)
{
char dir[MAXPGPATH];
join_path_components(dir, pgdata, PG_TBLSPC_DIR);
join_path_components(dir, dir, oid);
add_files(files, dir, true, false);
}
else
/* remove the detected tablespace from tblspc_list */
parray_rm(tblspc_list, name, strCompare);
}
/*
* tblspc_list is not empty,
* so snapshot-script output the tablespace name that not exist.
*/
if (parray_num(tblspc_list) > 0)
elog(ERROR_SYSTEM, _("snapshot-script output the name of tablespace that not exist"));
/* clear array */
parray_walk(tblspc_list, free);
parray_free(tblspc_list);
/* backup files from non-snapshot */
pgBackupGetPath(¤t, path, lengthof(path), DATABASE_DIR);
backup_files(pgdata, path, files, prev_files, lsn, current.compress_data, NULL);
/* notify end of backup */
pg_stop_backup(¤t);
/* create file list of non-snapshot objects */
create_file_list(files, pgdata, NULL, false);
/* mount snapshot volume to file-system, and obtain that mounted directory */
if (!check)
execute_mount(tblspcmp_list);
/* backup files from snapshot volume */
for (i = 0; i < parray_num(tblspcmp_list); i++)
{
char *spcname;
char *mp = NULL;
char *item = (char *) parray_get(tblspcmp_list, i);
parray *snapshot_files = parray_new();
/*
* obtain the TABLESPACE name and the directory where it is stored.
* Note: strtok() replace the delimiter to '\0'. but no problem because
* it doesn't use former value
*/
if ((spcname = strtok(item, "=")) == NULL || (mp = strtok(NULL, "\0")) == NULL)
elog(ERROR_SYSTEM, _("snapshot-script output illegal format: %s"), item);
if (verbose)
{
printf(_("========================================\n"));
printf(_("backup files from snapshot: \"%s\"\n"), spcname);
}
/* tablespace storage directory not exist */
if (!dirExists(mp))
elog(ERROR_SYSTEM, _("tablespace storage directory doesn't exist: %s"), mp);
/*
* create the previous backup file list to take incremental backup
* from the snapshot volume.
*/
if (prev_files != NULL)
prev_files = dir_read_file_list(mp, prev_file_txt);
/* when DB cluster is backup from snapshot, it backup from the snapshot */
if (strcmp(spcname, "PG-DATA") == 0)
{
/* append DB cluster to backup file list */
add_files(snapshot_files, mp, false, true);
/* backup files of DB cluster from snapshot volume */
backup_files(mp, path, snapshot_files, prev_files, lsn, current.compress_data, NULL);
/* create file list of snapshot objects (DB cluster) */
create_file_list(snapshot_files, mp, NULL, true);
/* remove the detected tablespace("PG-DATA") from tblspcmp_list */
parray_rm(tblspcmp_list, "PG-DATA", strCompare);
i--;
}
/* backup TABLESPACE from snapshot volume */
else
{
int j;
/*
* obtain the oid from TABLESPACE information acquired by inquiring of database.
* and do backup files of TABLESPACE from snapshot volume.
*/
for (j = 0; j < PQntuples(tblspc_res); j++)
{
char dest[MAXPGPATH];
char prefix[MAXPGPATH];
char *name = PQgetvalue(tblspc_res, j, 0);
char *oid = PQgetvalue(tblspc_res, j, 1);
if (strcmp(spcname, name) == 0)
{
/* append TABLESPACE to backup file list */
add_files(snapshot_files, mp, true, false);
/* backup files of TABLESPACE from snapshot volume */
join_path_components(prefix, PG_TBLSPC_DIR, oid);
join_path_components(dest, path, prefix);
backup_files(mp, dest, snapshot_files, prev_files, lsn, current.compress_data, prefix);
/* create file list of snapshot objects (TABLESPACE) */
create_file_list(snapshot_files, mp, prefix, true);
/* remove the detected tablespace("PG-DATA") from tblspcmp_list */
parray_rm(tblspcmp_list, spcname, strCompare);
i--;
break;
}
}
}
parray_concat(files, snapshot_files);
}
/*
* tblspcmp_list is not empty,
* so snapshot-script output the tablespace name that not exist.
*/
if (parray_num(tblspcmp_list) > 0)
elog(ERROR_SYSTEM, _("snapshot-script output the name of tablespace that not exist"));
/* clear array */
parray_walk(tblspcmp_list, free);
parray_free(tblspcmp_list);
/* snapshot became unnecessary, annul the snapshot */
if (!check)
{
/* unmount directory of mounted snapshot volume */
execute_umount();
/* annul the snapshot */
execute_resync();
}
/* unset the error processing for the snapshot */
pgut_atexit_pop(snapshot_cleanup, cleanup_list);
/* don't use 'parray_walk'. element of parray not allocate memory by malloc */
parray_free(cleanup_list);
PQclear(tblspc_res);
}
/* when snapshot-script not exist, DB cluster and TABLESPACE are backup
* at same time.
*/
else
{
/* list files with the logical path. omit $PGDATA */
add_files(files, pgdata, false, true);
/* backup files */
pgBackupGetPath(¤t, path, lengthof(path), DATABASE_DIR);
backup_files(pgdata, path, files, prev_files, lsn, current.compress_data, NULL);
/* notify end of backup */
pg_stop_backup(¤t);
/* create file list */
create_file_list(files, pgdata, NULL, false);
}
/* print summary of size of backup mode files */
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
if (!S_ISREG(file->mode))
continue;
current.total_data_bytes += file->size;
current.read_data_bytes += file->read_size;
if (file->write_size != BYTES_INVALID)
current.write_bytes += file->write_size;
}
if (verbose)
{
printf(_("database backup completed(read: " INT64_FORMAT " write: " INT64_FORMAT ")\n"),
current.read_data_bytes, current.write_bytes);
printf(_("========================================\n"));
}
return files;
}
/*
* backup archived WAL incrementally.
*/
static parray *
do_backup_arclog(parray *backup_list)
{
int i;
parray *files;
parray *prev_files = NULL; /* file list of previous database backup */
FILE *fp;
char path[MAXPGPATH];
char timeline_dir[MAXPGPATH];
char prev_file_txt[MAXPGPATH];
pgBackup *prev_backup;
int64 arclog_write_bytes = 0;
char last_wal[MAXPGPATH];
if (!HAVE_ARCLOG(¤t))
return NULL;
if (verbose)
{
printf(_("========================================\n"));
printf(_("archived WAL backup start\n"));
}
/* initialize size summary */
current.read_arclog_bytes = 0;
/* switch xlog if database is not backed up */
if (current.stop_lsn.xrecoff == 0)
pg_switch_xlog(¤t);
/*
* To take incremental backup, the file list of the last completed database
* backup is needed.
*/
prev_backup = catalog_get_last_arclog_backup(backup_list);
if (verbose && prev_backup == NULL)
printf(_("no previous full backup, performing a full backup instead\n"));
if (prev_backup)
{
pgBackupGetPath(prev_backup, prev_file_txt, lengthof(prev_file_txt),
ARCLOG_FILE_LIST);
prev_files = dir_read_file_list(arclog_path, prev_file_txt);
}
/* list files with the logical path. omit ARCLOG_PATH */
files = parray_new();
dir_list_file(files, arclog_path, NULL, true, false);
/* remove WALs archived after pg_stop_backup()/pg_switch_xlog() */
xlog_fname(last_wal, lengthof(last_wal), current.tli, ¤t.stop_lsn);
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
char *fname;
if ((fname = last_dir_separator(file->path)))
fname++;
else
fname = file->path;
/* to backup backup history files, compare tli/lsn portion only */
if (strncmp(fname, last_wal, 24) > 0)
{
parray_remove(files, i);
i--;
}
}
pgBackupGetPath(¤t, path, lengthof(path), ARCLOG_DIR);
backup_files(arclog_path, path, files, prev_files, NULL,
current.compress_data, NULL);
/* create file list */
if (!check)
{
pgBackupGetPath(¤t, path, lengthof(path), ARCLOG_FILE_LIST);
fp = fopen(path, "wt");
if (fp == NULL)
elog(ERROR_SYSTEM, _("can't open file list \"%s\": %s"), path,
strerror(errno));
dir_print_file_list(fp, files, arclog_path, NULL);
fclose(fp);
}
/* print summary of size of backup files */
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
if (!S_ISREG(file->mode))
continue;
current.read_arclog_bytes += file->read_size;
if (file->write_size != BYTES_INVALID)
{
current.write_bytes += file->write_size;
arclog_write_bytes += file->write_size;
}
}
/*
* Backup timeline history files to special directory.
* We do this after create file list, because copy_file() update
* pgFile->write_size to actual size.
*/
join_path_components(timeline_dir, backup_path, TIMELINE_HISTORY_DIR);
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
if (!S_ISREG(file->mode))
continue;
if (strstr(file->path, ".history") ==
file->path + strlen(file->path) - strlen(".history"))
{
elog(LOG, _("(timeline history) %s"), file->path);
copy_file(arclog_path, timeline_dir, file, NO_COMPRESSION);
}
}
if (verbose)
{
printf(_("archived WAL backup completed(read: " INT64_FORMAT " write: " INT64_FORMAT ")\n"),
current.read_arclog_bytes, arclog_write_bytes);
printf(_("========================================\n"));
}
return files;
}
/*
* Take a backup of serverlog.
*/
static parray *
do_backup_srvlog(parray *backup_list)
{
int i;
parray *files;
parray *prev_files = NULL; /* file list of previous database backup */
FILE *fp;
char path[MAXPGPATH];
char prev_file_txt[MAXPGPATH];
pgBackup *prev_backup;
int64 srvlog_write_bytes = 0;
if (!current.with_serverlog)
return NULL;
if (verbose)
{
printf(_("========================================\n"));
printf(_("serverlog backup start\n"));
}
/* initialize size summary */
current.read_srvlog_bytes = 0;
/*
* To take incremental backup, the file list of the last completed database
* backup is needed.
*/
prev_backup = catalog_get_last_srvlog_backup(backup_list);
if (verbose && prev_backup == NULL)
printf(_("no previous full backup, performing a full backup instead\n"));
if (prev_backup)
{
pgBackupGetPath(prev_backup, prev_file_txt, lengthof(prev_file_txt),
SRVLOG_FILE_LIST);
prev_files = dir_read_file_list(srvlog_path, prev_file_txt);
}
/* list files with the logical path. omit SRVLOG_PATH */
files = parray_new();
dir_list_file(files, srvlog_path, NULL, true, false);
pgBackupGetPath(¤t, path, lengthof(path), SRVLOG_DIR);
backup_files(srvlog_path, path, files, prev_files, NULL, false, NULL);
/* create file list */
if (!check)
{
pgBackupGetPath(¤t, path, lengthof(path), SRVLOG_FILE_LIST);
fp = fopen(path, "wt");
if (fp == NULL)
elog(ERROR_SYSTEM, _("can't open file list \"%s\": %s"), path,
strerror(errno));
dir_print_file_list(fp, files, srvlog_path, NULL);
fclose(fp);
}
/* print summary of size of backup mode files */
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
if (!S_ISREG(file->mode))
continue;
current.read_srvlog_bytes += file->read_size;
if (file->write_size != BYTES_INVALID)
{
current.write_bytes += file->write_size;
srvlog_write_bytes += file->write_size;
}
}
if (verbose)
{
printf(_("serverlog backup completed(read: " INT64_FORMAT " write: " INT64_FORMAT ")\n"),
current.read_srvlog_bytes, srvlog_write_bytes);
printf(_("========================================\n"));
}
return files;
}
int
do_backup(bool smooth_checkpoint,
int keep_arclog_files,
int keep_arclog_days,
int keep_srvlog_files,
int keep_srvlog_days,
int keep_data_generations,
int keep_data_days)
{
parray *backup_list;
parray *files_database;
parray *files_arclog;
parray *files_srvlog;
int server_version;
int ret;
/* PGDATA and BACKUP_MODE are always required */
if (pgdata == NULL)
elog(ERROR_ARGS, _("required parameter not specified: PGDATA (-D, --pgdata)"));
if (current.backup_mode == BACKUP_MODE_INVALID)
elog(ERROR_ARGS, _("required parameter not specified: BACKUP_MODE (-b, --backup-mode)"));
/* ARCLOG_PATH is requried only when backup archive WAL */
if (HAVE_ARCLOG(¤t) && arclog_path == NULL)
elog(ERROR_ARGS, _("required parameter not specified: ARCLOG_PATH (-A, --arclog-path)"));
/* SRVLOG_PATH is required only when backup serverlog */
if (current.with_serverlog && srvlog_path == NULL)
elog(ERROR_ARGS, _("required parameter not specified: SRVLOG_PATH (-S, --srvlog-path)"));
#ifndef HAVE_LIBZ
if (current->compress_data)
{
elog(WARNING, _("requested compression not available in this: installation -- archive will be uncompressed"));
current->compress_data = false;
}
#endif
/* confirm data block size and xlog block size are compatible */
server_version = get_server_version();
/* setup cleanup callback function */
in_backup = true;
/* show configuration actually used */
if (verbose)
{
printf(_("========================================\n"));
printf(_("backup start\n"));
printf(_("----------------------------------------\n"));
pgBackupWriteConfigSection(stderr, ¤t);
printf(_("----------------------------------------\n"));
}
/* get exclusive lock of backup catalog */
ret = catalog_lock();
if (ret == -1)
elog(ERROR_SYSTEM, _("can't lock backup catalog."));
else if (ret == 1)
elog(ERROR_ALREADY_RUNNING,
_("another pg_rman is running, skip this backup."));
/* initialize backup result */
current.status = BACKUP_STATUS_RUNNING;
current.tli = 0; /* get from result of pg_start_backup() */
current.start_lsn.xlogid = 0;
current.start_lsn.xrecoff = 0;
current.stop_lsn.xlogid = 0;
current.stop_lsn.xrecoff = 0;
current.start_time = time(NULL);
current.end_time = (time_t) 0;
current.total_data_bytes = BYTES_INVALID;
current.read_data_bytes = BYTES_INVALID;
current.read_arclog_bytes = BYTES_INVALID;
current.read_srvlog_bytes = BYTES_INVALID;
current.write_bytes = 0; /* write_bytes is valid always */
current.block_size = BLCKSZ;
current.wal_block_size = XLOG_BLCKSZ;
current.recovery_xid = 0;
current.recovery_time = (time_t) 0;
/* create backup directory and backup.ini */
if (!check)
{
if (pgBackupCreateDir(¤t))
elog(ERROR_SYSTEM, _("can't create backup directory."));
pgBackupWriteIni(¤t);
}
if (verbose)
printf(_("backup destination is initialized.\n"));
/* get list of backups already taken */
backup_list = catalog_get_backup_list(NULL);
if(!backup_list){
elog(ERROR_SYSTEM, _("can't process any more."));
}
/* set the error processing function for the backup process */
pgut_atexit_push(backup_cleanup, NULL);
/* backup data */
files_database = do_backup_database(backup_list, smooth_checkpoint);
/* backup archived WAL */
files_arclog = do_backup_arclog(backup_list);
/* backup serverlog */
files_srvlog = do_backup_srvlog(backup_list);
pgut_atexit_pop(backup_cleanup, NULL);
/* update backup status to DONE */
current.end_time = time(NULL);
current.status = BACKUP_STATUS_DONE;
if (!check)
pgBackupWriteIni(¤t);
if (verbose)
{
if (TOTAL_READ_SIZE(¤t) == 0)
printf(_("nothing to backup\n"));
else
printf(_("all backup completed(read: " INT64_FORMAT " write: "
INT64_FORMAT ")\n"),
TOTAL_READ_SIZE(¤t), current.write_bytes);
printf(_("========================================\n"));
}
/*
* Delete old files (archived WAL and serverlog) after update of status.
*/
if (HAVE_ARCLOG(¤t))
delete_old_files(arclog_path, files_arclog, keep_arclog_files,
keep_arclog_days, server_version, true);
if (current.with_serverlog)
delete_old_files(srvlog_path, files_srvlog, keep_srvlog_files,
keep_srvlog_days, server_version, false);
/* Delete old backup files after all backup operation. */
pgBackupDelete(keep_data_generations, keep_data_days);
/* Cleanup backup mode file list */
if (files_database)
parray_walk(files_database, pgFileFree);
parray_free(files_database);
if (files_arclog)
parray_walk(files_arclog, pgFileFree);
parray_free(files_arclog);
if (files_srvlog)
parray_walk(files_srvlog, pgFileFree);
parray_free(files_srvlog);
/*
* If this backup is full backup, delete backup of online WAL.
* Note that sereverlog files which were backed up during first restoration
* don't be delete.
* Also delete symbolic link in the archive directory.
*/
if (current.backup_mode == BACKUP_MODE_FULL)
{
delete_online_wal_backup();
delete_arclog_link();
}
/* release catalog lock */
catalog_unlock();
return 0;
}
/*
* get server version and confirm block sizes.
*/
int
get_server_version(void)
{
static int server_version = 0;
bool my_conn;
/* return cached server version */
if (server_version > 0)
return server_version;
my_conn = (connection == NULL);
if (my_conn)
reconnect();
/* confirm server version */
server_version = PQserverVersion(connection);
if (server_version < 80200)
elog(ERROR_PG_INCOMPATIBLE,
_("server version is %d.%d.%d, but must be 8.2 or higher."),
server_version / 10000,
(server_version / 100) % 100,
server_version % 100);
/* confirm block_size (BLCKSZ) and wal_block_size (XLOG_BLCKSZ) */
confirm_block_size("block_size", BLCKSZ);
if (server_version >= 80400)
confirm_block_size("wal_block_size", XLOG_BLCKSZ);
if (my_conn)
disconnect();
return server_version;
}
static void
confirm_block_size(const char *name, int blcksz)
{
PGresult *res;
char *endp;
int block_size;
res = execute("SELECT current_setting($1)", 1, &name);
if (PQntuples(res) != 1 || PQnfields(res) != 1)
elog(ERROR_PG_COMMAND, _("can't get %s: %s"),
name, PQerrorMessage(connection));
block_size = strtol(PQgetvalue(res, 0, 0), &endp, 10);
PQclear(res);
if ((endp && *endp) || block_size != blcksz)
elog(ERROR_PG_INCOMPATIBLE,
_("%s(%d) is not compatible(%d expected)"),
name, block_size, blcksz);
}
/*
* Notify start of backup to PostgreSQL server.
*/
static void
pg_start_backup(const char *label, bool smooth, pgBackup *backup)
{
PGresult *res;
const char *params[2];
int server_version;
params[0] = label;
reconnect();
server_version = get_server_version();
if (server_version >= 80400)
{
/* 2nd argument is 'fast'*/
params[1] = smooth ? "false" : "true";
res = execute("SELECT * from pg_xlogfile_name_offset(pg_start_backup($1, $2))", 2, params);
}
else
{
/* v8.3 always uses smooth checkpoint */
if (!smooth && server_version >= 80300)
command("CHECKPOINT", 0, NULL);
res = execute("SELECT * from pg_xlogfile_name_offset(pg_start_backup($1))", 1, params);
}
if (backup != NULL)
get_lsn(res, &backup->tli, &backup->start_lsn);
PQclear(res);
disconnect();
}
static void
wait_for_archive(pgBackup *backup, const char *sql)
{
PGresult *res;
char ready_path[MAXPGPATH];
int try_count;
reconnect();
res = execute(sql, 0, NULL);
if (backup != NULL)
{
get_lsn(res, &backup->tli, &backup->stop_lsn);
elog(LOG, _("%s(): tli=%X lsn=%X/%08X"), __FUNCTION__, backup->tli,
backup->stop_lsn.xlogid, backup->stop_lsn.xrecoff);
}
/* get filename from the result of pg_xlogfile_name_offset() */
snprintf(ready_path, lengthof(ready_path),
"%s/pg_xlog/archive_status/%s.ready", pgdata, PQgetvalue(res, 0, 0));
elog(LOG, "%s() wait for %s", __FUNCTION__, ready_path);
PQclear(res);
res = execute(TXID_CURRENT_SQL, 0, NULL);
if(backup != NULL){
get_xid(res, &backup->recovery_xid);
backup->recovery_time = time(NULL);
}
disconnect();
/* wait until switched WAL is archived */
try_count = 0;
while (fileExists(ready_path))
{
sleep(1);
if (interrupted)
elog(ERROR_INTERRUPTED,
_("interrupted during waiting for WAL archiving"));
try_count++;
if (try_count > TIMEOUT_ARCHIVE)
elog(ERROR_ARCHIVE_FAILED,
_("switched WAL could not be archived in %d seconds"),
TIMEOUT_ARCHIVE);
}
elog(LOG, "%s() .ready deleted in %d try", __FUNCTION__, try_count);
}
/*
* Notify end of backup to PostgreSQL server.
*/
static void
pg_stop_backup(pgBackup *backup)
{
wait_for_archive(backup,
"SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup())");
}
/*
* Force switch to a new transaction log file and update backup->tli.
*/
static void
pg_switch_xlog(pgBackup *backup)
{
wait_for_archive(backup,
"SELECT * FROM pg_xlogfile_name_offset(pg_switch_xlog())");
}
/*
* Get TimeLineID and LSN from result of pg_xlogfile_name_offset().
*/
static void
get_lsn(PGresult *res, TimeLineID *timeline, XLogRecPtr *lsn)
{
uint32 off_upper;
if (res == NULL || PQntuples(res) != 1 || PQnfields(res) != 2)
elog(ERROR_PG_COMMAND,
_("result of pg_xlogfile_name_offset() is invalid: %s"),
PQerrorMessage(connection));
/* get TimeLineID, LSN from result of pg_stop_backup() */
if (sscanf(PQgetvalue(res, 0, 0), "%08X%08X%08X",
timeline, &lsn->xlogid, &off_upper) != 3 ||
sscanf(PQgetvalue(res, 0, 1), "%u", &lsn->xrecoff) != 1)
{
elog(ERROR_PG_COMMAND,
_("result of pg_xlogfile_name_offset() is invalid: %s"),
PQerrorMessage(connection));
}