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gparted/src/SWRaid_Info.cc

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/* Copyright (C) 2015 Mike Fleetwood
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "SWRaid_Info.h"
#include "BlockSpecial.h"
#include "Utils.h"
#include <glibmm/ustring.h>
#include <fstream>
namespace GParted
{
// Data model:
// cache_initialised - Has the cache been loaded?
// mdadm_found - Is the "mdadm" command available?
// swraid_info_cache - Vector of member information in Linux Software RAID arrays.
// Only active arrays have /dev entries.
// Notes:
// * BS(member) is short hand for constructor BlockSpecial(member).
// * Array is only displayed as the mount point to the user and
// never compared so not constructing BlockSpecial object for it.
// E.g.
// //member , array , uuid , label , active
// [{BS("/dev/sda1)", "/dev/md1", "15224a42-c25b-bcd9-15db-60004e5fe53a", "chimney:1", true },
// {BS("/dev/sda2"), "/dev/md1", "15224a42-c25b-bcd9-15db-60004e5fe53a", "chimney:1", true },
// {BS("/dev/sda6"), "" , "8dc7483c-d74e-e0a8-b6a8-dc3ca57e43f8", "" , false},
// {BS("/dev/sdb6"), "" , "8dc7483c-d74e-e0a8-b6a8-dc3ca57e43f8", "" , false}
// ]
// Initialise static data elements
bool SWRaid_Info::cache_initialised = false;
bool SWRaid_Info::mdadm_found = false;
std::vector<SWRaid_Member> SWRaid_Info::swraid_info_cache;
void SWRaid_Info::load_cache()
{
set_command_found();
load_swraid_info_cache();
cache_initialised = true;
}
bool SWRaid_Info::is_member( const Glib::ustring & member_path )
{
initialise_if_required();
const SWRaid_Member & memb = get_cache_entry_by_member( member_path );
if ( memb.member.m_name.length() > 0 )
return true;
return false;
}
// Return member/array active status, or false when there is no such member.
bool SWRaid_Info::is_member_active( const Glib::ustring & member_path )
{
initialise_if_required();
const SWRaid_Member & memb = get_cache_entry_by_member( member_path );
return memb.active;
}
// Return array /dev entry (e.g. "/dev/md1") containing the specified member, or "" if the
// array is not running or there is no such member.
Glib::ustring SWRaid_Info::get_array( const Glib::ustring & member_path )
{
initialise_if_required();
const SWRaid_Member & memb = get_cache_entry_by_member( member_path );
return memb.array;
}
// Return array UUID for the specified member, or "" when failed to parse the UUID or
// there is no such member.
Glib::ustring SWRaid_Info::get_uuid( const Glib::ustring & member_path )
{
initialise_if_required();
const SWRaid_Member & memb = get_cache_entry_by_member( member_path );
return memb.uuid;
}
// Return array label (array name in mdadm terminology) for the specified member, or ""
// when the array has no label or there is no such member.
// (Metadata 0.90 arrays don't have names. Metata 1.x arrays are always named, getting a
// default of hostname ":" array number when not otherwise specified).
Glib::ustring SWRaid_Info::get_label( const Glib::ustring & member_path )
{
initialise_if_required();
const SWRaid_Member & memb = get_cache_entry_by_member( member_path );
return memb.label;
}
// Private methods
void SWRaid_Info::initialise_if_required()
{
if ( ! cache_initialised )
{
set_command_found();
load_swraid_info_cache();
cache_initialised = true;
}
}
void SWRaid_Info::set_command_found()
{
mdadm_found = ! Glib::find_program_in_path( "mdadm" ).empty();
}
void SWRaid_Info::load_swraid_info_cache()
{
Glib::ustring output, error;
swraid_info_cache.clear();
// Load SWRaid members into the cache. Load member device, array UUID and array
// label (array name in mdadm terminology).
if ( mdadm_found &&
! Utils::execute_command( "mdadm --examine --scan --verbose", output, error, true ) )
{
// Extract information from Linux Software RAID arrays only, excluding
// IMSM and DDF arrays. Example output:
// ARRAY metadata=imsm UUID=9a5e3477:e1e668ea:12066a1b:d3708608
// devices=/dev/sdd,/dev/sdc,/dev/md/imsm0
// ARRAY /dev/md/MyRaid container=9a5e3477:e1e668ea:12066a1b:d3708608 member=0 UUID=47518beb:cc6ef9e7:c80cd1c7:5f6ecb28
//
// ARRAY /dev/md/1 level=raid1 metadata=1.0 num-devices=2 UUID=15224a42:c25bbcd9:15db6000:4e5fe53a name=chimney:1
// devices=/dev/sda1,/dev/sdb1
// ARRAY /dev/md5 level=raid1 num-devices=2 UUID=8dc7483c:d74ee0a8:b6a8dc3c:a57e43f8
// devices=/dev/sda6,/dev/sdb6
std::vector<Glib::ustring> lines;
Utils::split( output, lines, "\n" );
enum MDADM_LINE_TYPE
{
MDADM_LT_OTHER = 0,
MDADM_LT_ARRAY = 1,
MDADM_LT_DEVICES = 2
};
MDADM_LINE_TYPE mdadm_line_type = MDADM_LT_OTHER;
Glib::ustring uuid;
Glib::ustring label;
for ( unsigned int i = 0 ; i < lines.size() ; i ++ )
{
Glib::ustring metadata_type;
if ( lines[i].substr( 0, 6 ) == "ARRAY " )
{
mdadm_line_type = MDADM_LT_ARRAY;
Glib::ustring metadata_type = Utils::regexp_label( lines[i],
"metadata=([[:graph:]]+)" );
// Mdadm with these flags doesn't seem to print the
// metadata tag for 0.90 version arrays. Accept no tag
// (or empty version) as well as "0.90".
if ( metadata_type != "" && metadata_type != "0.90" &&
metadata_type != "1.0" && metadata_type != "1.1" &&
metadata_type != "1.2" )
{
// Skip mdadm reported non-Linux Software RAID arrays
mdadm_line_type = MDADM_LT_OTHER;
continue;
}
uuid = mdadm_to_canonical_uuid(
Utils::regexp_label( lines[i], "UUID=([[:graph:]]+)" ) );
label = Utils::regexp_label( lines[i], "name=(.*)$" );
}
else if ( mdadm_line_type == MDADM_LT_ARRAY &&
lines[i].find( "devices=" ) != Glib::ustring::npos )
{
mdadm_line_type = MDADM_LT_DEVICES;
Glib::ustring devices_str = Utils::regexp_label( lines[i],
"devices=([[:graph:]]+)" );
std::vector<Glib::ustring> devices;
Utils::split( devices_str, devices, "," );
for ( unsigned int j = 0 ; j < devices.size() ; j ++ )
{
SWRaid_Member memb;
memb.member = BlockSpecial( devices[j] );
memb.array = "";
memb.uuid = uuid;
memb.label = label;
memb.active = false;
swraid_info_cache.push_back( memb );
}
uuid.clear();
label.clear();
}
else
{
mdadm_line_type = MDADM_LT_OTHER;
}
}
}
// For active SWRaid members, set array and active flag.
std::string line;
std::ifstream input( "/proc/mdstat" );
if ( input )
{
// Read /proc/mdstat extracting information for Linux Software RAID arrays
// only, excluding external IMSM and DDF arrays. Example /proc/mdstat:
// Personalities : [raid1]
// md127 : inactive sdd[1](S) sdc[0](S)
// 6306 blocks super external:imsm
//
// md126 : active raid1 sdc[1] sdd[0]
// 8383831 blocks super external:/md127/0 [2/2] [UU]
//
// md1 : active raid1 sdb1[3] sda1[2]
// 524224 blocks super 1.0 [2/2] [UU]
//
// md5 : active raid1 sda6[0] sdb6[1]
// 524224 blocks [2/2] [UU]
//
// unused devices: <none>
enum MDSTAT_LINE_TYPE
{
MDSTAT_LT_OTHER = 0,
MDSTAT_LT_ACTIVE = 1,
MDSTAT_LT_BLOCKS = 2
};
MDSTAT_LINE_TYPE mdstat_line_type = MDSTAT_LT_OTHER;
Glib::ustring array;
std::vector<Glib::ustring> members;
while ( getline( input, line ) )
{
if ( line.find( " : active " ) != std::string::npos )
{
mdstat_line_type = MDSTAT_LT_ACTIVE;
// Found a line for an active array. Split into space
// separated fields.
std::vector<Glib::ustring> fields;
Utils::tokenize( line, fields, " " );
array = "/dev/" + fields[0];
members.clear();
for ( unsigned int i = 0 ; i < fields.size() ; i ++ )
{
Glib::ustring::size_type index = fields[i].find( "[" );
if ( index != Glib::ustring::npos )
{
// Field contains an "[" so got a short
// kernel device name of a member.
members.push_back( "/dev/" + fields[i].substr( 0, index ) );
}
}
}
else if ( mdstat_line_type == MDSTAT_LT_ACTIVE &&
line.find( " blocks " ) != std::string::npos )
{
mdstat_line_type = MDSTAT_LT_BLOCKS;
// Found a blocks line for an array.
Glib::ustring super_type = Utils::regexp_label( line, "super ([[:graph:]]+)" );
// Kernel doesn't seem to print the super block type for
// 0.90 version arrays. Accept no tag (or empty version)
// as well as "0.90".
if ( super_type != "" && super_type != "0.90" &&
super_type != "1.0" && super_type != "1.1" &&
super_type != "1.2" )
{
// Skip /proc/mdstat reported non-Linux Software RAID arrays
mdstat_line_type = MDSTAT_LT_OTHER;
continue;
}
for ( unsigned int i = 0 ; i < members.size() ; i ++ )
{
SWRaid_Member & memb = get_cache_entry_by_member( members[i] );
if ( memb.member.m_name.length() > 0 )
{
// Update existing cache entry, setting
// array and active flag.
memb.array = array;
memb.active = true;
}
else
{
// Member not already found in the cache.
// (Mdadm command possibly missing).
// Insert cache entry.
SWRaid_Member new_memb;
new_memb.member = BlockSpecial( members[i] );
new_memb.array = array;
new_memb.uuid = "";
new_memb.label = "";
new_memb.active = true;
swraid_info_cache.push_back( new_memb );
}
}
array.clear();
members.clear();
}
else
{
mdstat_line_type = MDSTAT_LT_OTHER;
}
}
input.close();
}
}
// Perform linear search of the cache to find the matching member.
// Returns found cache entry or not found substitute.
SWRaid_Member & SWRaid_Info::get_cache_entry_by_member( const Glib::ustring & member_path )
{
BlockSpecial bs = BlockSpecial( member_path );
for ( unsigned int i = 0 ; i < swraid_info_cache.size() ; i ++ )
{
if ( bs == swraid_info_cache[i].member )
return swraid_info_cache[i];
}
static SWRaid_Member memb = {BlockSpecial(), "", "", "", false};
return memb;
}
// Reformat mdadm printed UUID into canonical format. Returns "" if source not correctly
// formatted.
// E.g. "15224a42:c25bbcd9:15db6000:4e5fe53a" -> "15224a42-c25b-bcd9-15db-60004e5fe53a"
Glib::ustring SWRaid_Info::mdadm_to_canonical_uuid( const Glib::ustring & mdadm_uuid )
{
Glib::ustring verified_uuid = Utils::regexp_label( mdadm_uuid,
"^([[:xdigit:]]{8}:[[:xdigit:]]{8}:[[:xdigit:]]{8}:[[:xdigit:]]{8})$" );
if ( verified_uuid.empty() )
return verified_uuid;
Glib::ustring canonical_uuid = verified_uuid.substr( 0, 8) + "-" +
verified_uuid.substr( 9, 4) + "-" +
verified_uuid.substr(13, 4) + "-" +
verified_uuid.substr(18, 4) + "-" +
verified_uuid.substr(22, 4) + verified_uuid.substr(27, 8);
return canonical_uuid;
}
} //GParted
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