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package devices; # $Id$
use diagnostics;
use strict;
use common;
use run_program;
use log;
use c;
sub size {
my ($dev) = @_;
sysopen(my $F, $dev, 0) or log::l("open $dev: $!"), return 0;
my $valid_offset = sub { sysseek($F, $_[0], 0) && sysread($F, my $_a, 1) };
#- first try getting the size nicely
if (my $size = c::total_sectors(fileno $F)) {
return $size * $common::SECTORSIZE;
}
#- sad it didn't work, well searching the size using the dichotomy algorithm!
my $low = 0;
my ($high, $mid);
#- first find n where 2^n < size <= 2^n+1
for ($high = 1; $high > 0 && $valid_offset->($high); $high *= 2) { $low = $high }
while ($low < $high - 1) {
$mid = int(($low + $high) / 2);
$valid_offset->($mid) ? $low : $high = $mid;
}
$low + 1;
}
sub del_loop {
my ($dev) = @_;
run_program::run("losetup", "-d", $dev);
}
sub find_free_loop {
foreach (0..7) {
my $dev = make("loop$_");
sysopen(my $F, $dev, 2) or next;
!ioctl($F, c::LOOP_GET_STATUS(), my $_tmp) && $! == 6 or next; #- 6 == ENXIO
return $dev;
}
die "no free loop found";
}
sub set_loop {
my ($file, $encrypt_key, $encryption) = @_;
my $dev = find_free_loop();
if ($encrypt_key && $encryption) {
my $cmd = "losetup -p 0 -e $encryption $dev $file";
log::l("calling $cmd");
open(my $F, "|$cmd");
print $F $encrypt_key;
close $F or die "losetup failed";
} else {
run_program::run("losetup", $dev, $file) or return;
}
$dev;
}
sub entry {
my ($type, $major, $minor);
local ($_) = @_;
if (/^0x([\da-f]{3,4})$/i) {
$type = c::S_IFBLK();
($major, $minor) = unmakedev(hex $1);
} elsif (/^sd(.)(\d{0,2})/) {
$type = c::S_IFBLK();
$major = 8;
$minor = 16 * (ord($1) - ord('a')) + ($2 || 0);
} elsif (/^hd(.)(\d{0,2})/) {
$type = c::S_IFBLK();
($major, $minor) =
@{ ${{'a' => [3, 0], 'b' => [3, 64],
'c' => [22,0], 'd' => [22,64],
'e' => [33,0], 'f' => [33,64],
'g' => [34,0], 'h' => [34,64],
'i' => [56,0], 'j' => [56,64],
'k' => [57,0], 'l' => [57,64],
'm' => [88,0], 'n' => [88,64],
'o' => [89,0], 'p' => [89,64],
'q' => [90,0], 'r' => [90,64],
's' => [91,0], 't' => [91,64],
}}{$1} or die "unknown device $_" };
$minor += $2 || 0;
} elsif (/^ram(.*)/) {
$type = c::S_IFBLK();
$major = 1;
$minor = $1 eq '' ? 1 : $1;
} elsif (m|^rd/c(\d+)d(\d+)(p(\d+))?|) {
# dac 960 "rd/cXdXXpX"
$type = c::S_IFBLK();
$major = 48 + $1;
$minor = 8 * $2 + $4;
} elsif (m,(ida|cciss)/c(\d+)d(\d+)(?:p(\d+))?,) {
# Compaq Smart Array "ida/c0d0{p1}"
$type = c::S_IFBLK();
$major = ($1 eq 'ida' ? 72 : 104) + $2;
$minor = 16 * $3 + ($4 || 0);
} elsif (m,(ataraid)/d(\d+)(?:p(\d+))?,) {
# ATA raid "ataraid/d0{p1}"
$type = c::S_IFBLK();
$major = 114;
$minor = 16 * $1 + ($2 || 0);
} elsif (/(.*?)(\d+)$/) {
($type, $major, $minor) =
@{ ${{"fd" => [ c::S_IFBLK(), 2, 0 ],
"hidbp-mse-" => [ c::S_IFCHR(), 10, 32 ],
"lp" => [ c::S_IFCHR(), 6, 0 ],
"usb/lp" => [ c::S_IFCHR(), 180, 0 ],
"input/event" => [ c::S_IFCHR(), 13, 64 ],
"loop" => [ c::S_IFBLK(), 7, 0 ],
"md" => [ c::S_IFBLK(), 9, 0 ],
"nst" => [ c::S_IFCHR(), 9, 128 ],
"scd" => [ c::S_IFBLK(), 11, 0 ],
"ttyS" => [ c::S_IFCHR(), 4, 64 ],
"ubd/" => [ c::S_IFBLK(), 98, 0 ],
}}{$1} };
$minor += $2;
}
unless ($type) {
($type, $major, $minor) =
@{ ${{"aztcd" => [ c::S_IFBLK(), 29, 0 ],
"bpcd" => [ c::S_IFBLK(), 41, 0 ],
"cdu31a" => [ c::S_IFBLK(), 15, 0 ],
"cdu535" => [ c::S_IFBLK(), 24, 0 ],
"cm206cd" => [ c::S_IFBLK(), 32, 0 ],
"gscd" => [ c::S_IFBLK(), 16, 0 ],
"mcd" => [ c::S_IFBLK(), 23, 0 ],
"mcdx" => [ c::S_IFBLK(), 20, 0 ],
"mem" => [ c::S_IFCHR(), 1, 1 ],
"optcd" => [ c::S_IFBLK(), 17, 0 ],
"kbd" => [ c::S_IFCHR(), 11, 0 ],
"psaux" => [ c::S_IFCHR(), 10, 1 ],
"atibm" => [ c::S_IFCHR(), 10, 3 ],
"random" => [ c::S_IFCHR(), 1, 8 ],
"sbpcd" => [ c::S_IFBLK(), 25, 0 ],
"sjcd" => [ c::S_IFBLK(), 18, 0 ],
"tty" => [ c::S_IFCHR(), 5, 0 ],
"usbmouse" => [ c::S_IFCHR(), 13, 63 ], #- aka /dev/input/mice
"adbmouse" => [ c::S_IFCHR(), 10, 10 ], #- PPC
"vcsa" => [ c::S_IFCHR(), 7, 128 ],
"zero" => [ c::S_IFCHR(), 1, 5 ],
"null" => [ c::S_IFCHR(), 1, 3 ],
}}{$_} or die "unknown device $_ (caller is " . join(":", caller()) . ")" };
}
($type, $major, $minor);
}
sub make($) {
local $_ = my $file = $_[0];
if (m,^(.*/(?:dev|tmp))/(.*),) {
$_ = $2;
} else {
$file =~ m|^/| && -e $file or $file = "/tmp/$_";
$file =~ m|^/| && -e $file or $file = "/dev/$_";
}
-e $file and return $file; #- assume nobody takes fun at creating files named as device
my ($type, $major, $minor) = eval { entry($_) };
$@ and die "unknown device $_ (caller is " . join(":", caller()) . ")";
if ($file =~ m|/dev/| && -e '/dev/.devfsd') {
#- argh, creating devices is no good with devfs...
#- return the file even if the device file doesn't exist
#- the caller will fail or not, better compatibility than raising an exception here
return $file;
}
#- make a directory for this inode if needed.
mkdir_p(dirname($file));
syscall_('mknod', $file, $type | 0600, makedev($major, $minor)) or die "mknod failed (dev $_): $!";
$file;
}
#- only isomorphic entries are allowed,
#- i.e. entries which can go devfs -> normal and normal -> devfs
my %to_devfs = (
psaux => 'misc/psaux',
usbmouse => 'input/mice',
);
my %to_devfs_prefix = (
ttyS => 'tts/',
);
sub to_devfs {
my ($dev) = @_;
if (my $r = $to_devfs{$dev}) {
return $r;
} elsif ($dev =~ /(.*?)(\d+)$/) {
my $r = $to_devfs_prefix{$1};
return "$r$2" if $r;
}
undef;
}
sub from_devfs {
my ($dev) = @_;
my %from_devfs = reverse %to_devfs;
if (my $r = $from_devfs{$dev}) {
return $r;
} elsif ($dev =~ /(.*?)(\d+)$/) {
my %from_devfs_prefix = reverse %to_devfs_prefix;
my $r = $from_devfs_prefix{$1};
return "$r$2" if $r;
}
undef;
}
1;
|
