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Switch pg_verify_checksums back to a blacklist 

This basically reverts commit d55241af70,
leaving around a portion of the regression tests still adapted with
empty relation files, and corrupted cases.  This is also proving to be
failing to check properly relation files located in a non-default
tablespace path.

Per discussion with various folks, including Stephen Frost, David
Steele, Andres Freund, Michael Banck and myself.

Reported-by: Michael Banck
Discussion: https://postgr.es/m/20181021134206.GA14282@paquier.xyz
Backpatch-through: 11
This commit is contained in:
Michael Paquier 2018-11-30 10:14:58 +09:00
parent d328991578
commit a1c91dd110
2 changed files with 17 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
src/bin/pg_verify_checksums/pg_verify_checksums.c
View File

@ -15,7 +15,6 @@
#include "catalog/pg_control.h"
#include "common/controldata_utils.h"
#include "common/relpath.h"
#include "getopt_long.h"
#include "pg_getopt.h"
#include "storage/bufpage.h"
@ -50,69 +49,27 @@ usage(void)
printf(_("Report bugs to <pgsql-bugs@postgresql.org>.\n"));
}
/*
* isRelFileName
*
* Check if the given file name is authorized for checksum verification.
*/
static const char *const skip[] = {
"pg_control",
"pg_filenode.map",
"pg_internal.init",
"PG_VERSION",
NULL,
};
static bool
isRelFileName(const char *fn)
skipfile(const char *fn)
{
int pos;
const char *const *f;
/*----------
* Only files including data checksums are authorized for verification.
* This is guessed based on the file name by reverse-engineering
* GetRelationPath() so make sure to update both code paths if any
* updates are done. The following file name formats are allowed:
* <digits>
* <digits>.<segment>
* <digits>_<forkname>
* <digits>_<forkname>.<segment>
*
* Note that temporary files, beginning with 't', are also skipped.
*
*----------
*/
/* A non-empty string of digits should follow */
for (pos = 0; isdigit((unsigned char) fn[pos]); ++pos)
;
/* leave if no digits */
if (pos == 0)
return false;
/* good to go if only digits */
if (fn[pos] == '\0')
if (strcmp(fn, ".") == 0 ||
strcmp(fn, "..") == 0)
return true;
/* Authorized fork files can be scanned */
if (fn[pos] == '_')
{
int forkchar = forkname_chars(&fn[pos + 1], NULL);
if (forkchar <= 0)
return false;
pos += forkchar + 1;
}
/* Check for an optional segment number */
if (fn[pos] == '.')
{
int segchar;
for (segchar = 1; isdigit((unsigned char) fn[pos + segchar]); ++segchar)
;
if (segchar <= 1)
return false;
pos += segchar;
}
/* Now this should be the end */
if (fn[pos] != '\0')
return false;
return true;
for (f = skip; *f; f++)
if (strcmp(*f, fn) == 0)
return true;
return false;
}
static void
@ -189,7 +146,7 @@ scan_directory(const char *basedir, const char *subdir)
char fn[MAXPGPATH];
struct stat st;
if (!isRelFileName(de->d_name))
if (skipfile(de->d_name))
continue;
snprintf(fn, sizeof(fn), "%s/%s", path, de->d_name);

17
src/bin/pg_verify_checksums/t/002_actions.pl
View File

@ -17,23 +17,6 @@ command_like(['pg_controldata', $pgdata],
qr/Data page checksum version:.*1/,
'checksums enabled in control file');
# Add set of dummy files with some contents. These should not be scanned
# by the tool.
# On Windows, file name "foo." == "foo", so skip that pattern there.
append_to_file "$pgdata/global/123.", "foo" unless $windows_os;
append_to_file "$pgdata/global/123_", "foo";
append_to_file "$pgdata/global/123_.", "foo" unless $windows_os;;
append_to_file "$pgdata/global/123.12t", "foo";
append_to_file "$pgdata/global/foo", "foo2";
append_to_file "$pgdata/global/t123", "bar";
append_to_file "$pgdata/global/123a", "bar2";
append_to_file "$pgdata/global/.123", "foobar";
append_to_file "$pgdata/global/_fsm", "foobar2";
append_to_file "$pgdata/global/_init", "foobar3";
append_to_file "$pgdata/global/_vm.123", "foohoge";
append_to_file "$pgdata/global/123_vm.123t", "foohoge2";
# These are correct but empty files, so they should pass through.
append_to_file "$pgdata/global/99999", "";
append_to_file "$pgdata/global/99999.123", "";