54 lines
1.5 KiB
Perl
54 lines
1.5 KiB
Perl
#!/usr/bin/perl
|
|
# Idea:
|
|
# - run `nc -l 6777 > logfile.txt` on your machine
|
|
# - run `perl check-fsync-write.pl` on tested machine
|
|
# - pull power plug out from tested machine (do not press RESET! pull the plug out!)
|
|
# - power it back on
|
|
# - copy logfile.txt to tested machine
|
|
# - run `perl check-fsync-read.pl /dev/sdX logfile.txt` and check the output
|
|
|
|
use strict;
|
|
use Socket qw(PF_INET SOCK_STREAM pack_sockaddr_in inet_aton);
|
|
use File::Sync qw(fsync);
|
|
use Fcntl qw(:DEFAULT O_ASYNC O_DIRECT);
|
|
|
|
# Parameters
|
|
my $diskpath = "/dev/sdf"; # device
|
|
my $disksize = 499896320/8; # (device size / 4096)
|
|
my $ip = '172.29.1.109'; # logger machine IP
|
|
my $port = 6777; # logger machine port
|
|
|
|
# Code
|
|
my $bufsize = 4096;
|
|
my $align = 512;
|
|
my $buffer = ' ' x ($align+$bufsize);
|
|
my $off = unpack("J", pack "p", $buffer) % $align;
|
|
$off = $align - $off if $off;
|
|
|
|
my $socket;
|
|
socket $socket, PF_INET, SOCK_STREAM, 0 or die $!;
|
|
connect $socket, pack_sockaddr_in($port, inet_aton($ip)) or die $!;
|
|
|
|
my $randfd;
|
|
open $randfd, "/dev/urandom" or die $!;
|
|
|
|
my $fd;
|
|
sysopen $fd, $diskpath, O_WRONLY|O_DIRECT, 0666 or die $!;
|
|
while (1)
|
|
{
|
|
my $pos;
|
|
my $number;
|
|
read $randfd, $pos, 4 or die $!;
|
|
read $randfd, $number, 8 or die $!;
|
|
substr($buffer, $off, 4096, $number x 512);
|
|
$pos = int(1.0 * ($disksize-1) * (unpack("V", $pos) & 0x7fffffff) / 0x7fffffff);
|
|
sysseek($fd, $pos*4096, 0) or die $!;
|
|
syswrite($fd, $buffer, 4096, $off) or die $!;
|
|
fsync($fd);
|
|
my $s = "$pos ".unpack("H*", $number)."\x0d\x0a";
|
|
syswrite($socket, $s, length $s) or die $!;
|
|
}
|
|
close $fd;
|
|
|
|
close $randfd;
|