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