From 3c6fbfb082361277877a5dd82f7014eff0afaa92 Mon Sep 17 00:00:00 2001
From: Pascal Rigaux <pixel@mandriva.com>
Date: Sun, 8 Aug 2004 07:10:15 +0000
Subject: - switch to mdadm (instead of raidtools) - create mdadm.conf instead
 of raidtab - internal {raids} is no more indexed by X for mdX, and so don't
 have holes anymore - internal {chunk-size} is now a number in KiB - internal
 {raid} is the raid device name, not the number - various cleanup for raid
 detection

---
 perl-install/raid.pm | 204 ++++++++++++++++++++++++++++++++-------------------
 1 file changed, 128 insertions(+), 76 deletions(-)

(limited to 'perl-install/raid.pm')

diff --git a/perl-install/raid.pm b/perl-install/raid.pm
index d91f3984b..a91466a6b 100644
--- a/perl-install/raid.pm
+++ b/perl-install/raid.pm
@@ -15,65 +15,60 @@ use fs;
 
 sub max_nb() { 31 }
 
-sub nb { 
-    my ($nb) = @_;
-    first((ref($nb) ? $nb->{device} : $nb) =~ /(\d+)/);
-}
-
 sub new {
-    my ($raids, @parts) = @_;
-    my $nb = @$raids; 
-    $raids->[$nb] = { 'chunk-size' => "64k", fs_type => 'ext3', disks => [ @parts ], device => "md$nb", notFormatted => 1, level => 1 };
-    foreach my $part (@parts) {
-	$part->{raid} = $nb;
-	delete $part->{mntpoint};
+    my ($raids, %opts) = @_;
+    my $md_part = { %opts };
+    add2hash_($md_part, { 'chunk-size' => '64', disks => [], 
+			  device => 'md' . int(@$raids), 
+			  notFormatted => 1, level => 1 });
+    push @$raids, $md_part;
+    foreach (@{$md_part->{disks}}) {
+	$_->{raid} = $md_part->{device};
+	fs::type::set_pt_type($_, 0xfd);
+	delete $_->{mntpoint};
     }
-    update($raids->[$nb]);
-    $nb;
+    update($md_part);
+    $md_part;
 }
 
 sub add {
-    my ($raids, $part, $nb) = @_; $nb = nb($nb);
-    $raids->[$nb]{isMounted} and die N("Can't add a partition to _formatted_ RAID md%d", $nb);
-    inactivate_and_dirty($raids->[$nb]);
+    my ($md_part, $part) = @_;
+    $md_part->{isMounted} and die N("Can't add a partition to _formatted_ RAID %s", $md_part->{device});
+    inactivate_and_dirty($md_part);
     set_isFormatted($part, 0);
-    $part->{raid} = $nb;
+    $part->{raid} = $md_part->{device};
     delete $part->{mntpoint};
-    push @{$raids->[$nb]{disks}}, $part;
-    update($raids->[$nb]);
+    push @{$md_part->{disks}}, $part;
+    update($md_part);
 }
 
 sub delete {
-    my ($raids, $nb) = @_;
-    $nb = nb($nb);
-    inactivate_and_dirty($raids->[$nb]);
-    delete $_->{raid} foreach @{$raids->[$nb]{disks}};
-    undef $raids->[$nb];
+    my ($raids, $md_part) = @_;
+    inactivate_and_dirty($md_part);
+    delete $_->{raid} foreach @{$md_part->{disks}};
+    @$raids = grep { $_ != $md_part } @$raids;
 }
 
-sub changeNb {
-    my ($raids, $oldnb, $newnb) = @_;
-    if ($oldnb != $newnb) {
-	inactivate_and_dirty($raids->[$_]) foreach $oldnb, $newnb;
-
-	($raids->[$newnb], $raids->[$oldnb]) = ($raids->[$oldnb], undef);
-	$raids->[$newnb]{device} = "md$newnb";
-	$_->{raid} = $newnb foreach @{$raids->[$newnb]{disks}};
+sub change_device {
+    my ($md_part, $prev_device) = @_;
+    if ($prev_device ne $md_part->{device}) {
+	inactivate_and_dirty({ device => $prev_device });
+	$_->{raid} = $md_part->{device} foreach @{$md_part->{disks}};
     }
-    $newnb;
 }
 
 sub removeDisk {
     my ($raids, $part) = @_;
-    my $nb = nb($part->{raid});
-    inactivate_and_dirty($raids->[$nb]);
+    my $md_part = fs::get::device2part($part->{raid}, $raids);
+    inactivate_and_dirty($md_part);
+    fs::type::set_isFormatted($part, 0);
     delete $part->{raid};
-    my $disks = $raids->[$nb]{disks};
+    my $disks = $md_part->{disks};
     @$disks = grep { $_ != $part } @$disks;
     if (@$disks) {
-	update($raids->[$nb]);
+	update($md_part);
     } else {
-	undef $raids->[$nb];
+	@$raids = grep { $_ != $md_part } @$raids;
     }
 }
 
@@ -103,27 +98,6 @@ sub update {
     updateSize($_) foreach @_;
 }
 
-sub write {
-    my ($raids, $file) = @_;
-    return if $::testing;
-
-    output($file,
-	   map {
-	       my $s = sprintf(<<EOF, devices::make($_->{device}), $_->{level}, $_->{'chunk-size'}, int @{$_->{disks}});
-raiddev       %s
-raid-level    %s
-chunk-size    %s
-persistent-superblock 1
-nr-raid-disks %d
-EOF
-	       my @devs = map_index { 
-		   "    device    " . devices::make($_->{device}) . "\n    raid-disk $::i\n";
-	       } @{$_->{disks}};
-
-	       $s, @devs
-	   } grep { $_ } @$raids);
-}
-
 sub make {
     my ($raids, $part) = @_;    
 
@@ -132,11 +106,15 @@ sub make {
     inactivate_and_dirty($part);
 
     isRAID($_) and make($raids, $_) foreach @{$part->{disks}};
-    my $dev = devices::make($part->{device});
     eval { modules::load(module($part)) };
-    &write($raids, "/etc/raidtab");
-    run_program::run("mkraid", "--really-force", $dev) or die
-	$::isStandalone ? N("mkraid failed (maybe raidtools are missing?)") : N("mkraid failed");
+
+    whereis_binary('mdadm') or die 'mdadm not installed';
+
+    run_program::run_or_die('mdadm', '--create', '--run', devices::make($part->{device}), 
+			    '--chunk=' . $part->{'chunk-size'}, 
+			    "--level=$part->{level}", 
+			    '--raid-devices=' . int(@{$part->{disks}}),
+			    map { devices::make($_->{device}) } @{$part->{disks}});
 }
 
 sub format_part {
@@ -150,27 +128,18 @@ sub format_part {
 
 sub verify {
     my ($raids) = @_;
-    $raids or return;
-    foreach (grep { $_ } @$raids) {
+    foreach (@$raids) {
 	@{$_->{disks}} >= ($_->{level} =~ /4|5/ ? 3 : 2) or die N("Not enough partitions for RAID level %d\n", $_->{level});
     }
 }
 
 sub prepare_prefixed {
-    my ($raids, $prefix) = @_;
-    $raids or return;
-
-    &write($raids, "/etc/raidtab") if ! -e "/etc/raidtab";
-    
-    eval { cp_af("/etc/raidtab", "$prefix/etc/raidtab") };
-    foreach (grep { $_ } @$raids) {
-	devices::make("$prefix/dev/$_->{device}") foreach @{$_->{disks}};
-    }
+    my ($_raids) = @_;
 }
 
 sub inactivate_and_dirty {
     my ($part) = @_;
-    run_program::run("raidstop", devices::make($part->{device}));
+    run_program::run('mdadm', '--stop', devices::make($part->{device}));
     set_isFormatted($part, 0);
 }
 
@@ -178,11 +147,94 @@ sub active_mds() {
     map { if_(/^(md\d+) /, $1) } cat_("/proc/mdstat");
 }
 
+sub detect_during_install {
+    my (@parts) = @_;
+    detect_during_install_once(@parts);
+    detect_during_install_once(@parts) if active_mds(); #- try again to detect RAID 10
+}
+
+sub detect_during_install_once {
+    my (@parts) = @_;
+    devices::make("md$_") foreach 0 .. max_nb();
+    output('/etc/mdadm.conf', join(' ', 'DEVICE', 
+				   (map { "/dev/$_" } active_mds()), 
+				   map { devices::make($_->{device}) } @parts), "\n");
+    run_program::run('mdadm', '>>', '/etc/mdadm.conf', '--examine', '--scan');
+
+    foreach (@{parse_mdadm_conf(scalar cat_('/etc/mdadm.conf'))->{ARRAY}}) {
+	eval { modules::load($_->{level}) };
+    }
+    run_program::run('mdadm', '--assemble', '--scan');    
+}
+
+sub get_existing {
+    my @parts = @_;
+    my $raids = [];
+    foreach my $md (active_mds()) {
+	my $conf = parse_mdadm_conf(scalar run_program::get_stdout('mdadm', '--detail', '--brief', devices::make($md)));
+
+	@{$conf->{ARRAY}} == 1 or internal_error("too many answers");
+	my $raw_part = $conf->{ARRAY}[0];
+
+	$raw_part->{level} =~ s/raid//; #- { linear | raid0 | raid1 | raid5 } -> { linear | 0 | 1 | 5 }
+
+	my @mdparts = 
+	  map { 
+	      if (my $part = fs::get::device2part($_, [ @parts, @$raids ])) {
+		  $part;
+	      } else {
+		  log::l("ERROR: unknown raw raid device $_");
+		  ();
+	      }
+	  } split(',', $raw_part->{devices});
+
+	my $md_part = new($raids, device => $md, level => $raw_part->{level}, disks => \@mdparts);
+
+	my $fs_type = fs::type::fs_type_from_magic($md_part);
+	fs::type::set_fs_type($md_part, $fs_type || 'ext3');
+	fs::type::set_isFormatted($md_part, to_bool($fs_type));
+
+	log::l("RAID: found $md (raid $md_part->{level}) type $fs_type with parts $raw_part->{devices}");
+    }
+    $raids;
+}
+
 sub is_active {
     my ($dev) = @_;
     member($dev, active_mds());
 }
 
-sub inactivate_all() { run_program::run("raidstop", devices::make($_)) foreach active_mds() }
+sub inactivate_all() { 
+    run_program::run('mdadm', '--stop', devices::make($_)) foreach active_mds();
+}
+
+sub prepare_prefixed {
+    my ($raids) = @_;
+    my %raids = map {
+	devices::make($_->{device}) =>
+	    [ map { devices::make($_->{device}) } @{$_->{disks}} ]
+    } @$raids;
+
+    output("$::prefix/etc/mdadm.conf",
+	   join(' ', 'DEVICE', uniq(map { @$_ } values %raids)) . "\n",
+	   map_each { "ARRAY $::a devices=" . join(',', @$::b) . "\n" } %raids);
+}
+
+sub parse_mdadm_conf {
+    my ($s) = @_;
+    my %conf = (DEVICE => [], ARRAY => []);
+    $s =~ s!^\s*#.*!!gm; #- remove comments
+    $s =~ s!\n(\s)!$1!g; #- join lines starting with a space
+    foreach (split("\n", $s)) {
+	if (/^DEVICE\s+(.*)/) {
+	    push @{$conf{DEVICE}}, split(' ', $1);
+	} elsif (my ($md, $md_conf) = /^ARRAY\s+(\S+)\s*(.*)/) {
+	    my %md_conf = map { if_(/(.*)=(.*)/, $1 => $2) } split(' ', $md_conf);
+	    $md_conf{device} = $md;
+	    push @{$conf{ARRAY}}, \%md_conf;
+	}
+    }
+    \%conf
+}
 
 1;
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