Detect Linux SWRaid members by querying mdadm (#756829)
Detection of Linux SWRaid members currently fails in a number of cases:
1) Arrays which use metadata type 0.90 or 1.0 store the super block at
the end of the partition. So file system signatures in at least
linear and mirrored arrays occur at the same offsets in the
underlying partitions. As libparted only recognises file systems
this is what is detected, rather than an SWRaid member.
# mdadm -E -s -v
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
...
# wipefs /dev/sda1
offset type
----------------------------------------------------------------
0x438 ext4 [filesystem]
LABEL: chimney-boot
UUID: 10ab5f7d-7d8a-4171-8b6a-5e973b402501
0x1fffe000 linux_raid_member [raid]
LABEL: chimney:1
UUID: 15224a42-c25b-bcd9-15db-60004e5fe53a
# parted /dev/sda print
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sda: 34.4GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 1049kB 538MB 537MB primary ext4 boot, raid
...
2) Again with metadata type 0.90 or 1.0 arrays blkid may report the
contained file system instead of an SWRaid member. Have a single
example of this configuration with a mirrored array containing the
/boot file system. Blkid reports one member as ext4 and the other as
SWRaid!
# blkid | egrep 'sd[ab]1'
/dev/sda1: UUID="10ab5f7d-7d8a-4171-8b6a-5e973b402501" TYPE="ext4" LABEL="chimney-boot"
/dev/sdb1: UUID="15224a42-c25b-bcd9-15db-60004e5fe53a" UUID_SUB="0a095e45-9360-1b17-0ad1-1fe369e22b98" LABEL="chimney:1" TYPE="linux_raid_member"
Bypassing the blkid cache gets the correct result.
# blkid -c /dev/null /dev/sda1
/dev/sda1: UUID="15224a42-c25b-bcd9-15db-60004e5fe53a" UUID_SUB="d0460f90-d11a-e80a-ee1c-3d104dae7e5d" LABEL="chimney:1" TYPE="linux_raid_member"
However this can't be used because if a user has a floppy configured
in the BIOS but no floppy attached, GParted will wait for minutes as
the kernel tries to access non-existent hardware on behalf of the
blkid query. See commit:
18f863151c
Fix long scan problem when BIOS floppy setting incorrect
3) Old versions of blkid don't recognise SWRaid members at all so always
report the file system when found. Occurs with blkid v1.0 on
RedHat / CentOS 5.
The only way I can see how to fix all these cases is to use the mdadm
command to query the configured arrays. Then use this information for
first choice when detecting partition content, making the order: SWRaid
members, libparted, blkid and internal.
GParted shell wrapper already creates temporary blank udev rules to
prevent Linux Software RAID arrays being automatically started when
GParted refreshes its device information[1]. However an administrator
could manually stop or start arrays or change their configuration
between refreshes so GParted must load this information every refresh.
On my desktop with 4 internal hard drives and 3 testing Linux Software
RAID arrays, running mdadm adds between 0.20 and 0.30 seconds to the
device refresh time.
[1] a255abf343
Prevent GParted starting stopped Linux Software RAID arrays (#709640)
Bug 756829 - SWRaid member detection enhancements
This commit is contained in:
Mike Fleetwood
Curtis Gedak
parent
69cc508be2
commit
5f02bcf463
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@ -38,6 +38,7 @@ EXTRA_DIST = \
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Partition.h \
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PipeCapture.h \
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Proc_Partitions_Info.h \
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SWRaid_Info.h \
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TreeView_Detail.h \
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Utils.h \
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Win_GParted.h \
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@ -0,0 +1,49 @@
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/* Copyright (C) 2015 Mike Fleetwood
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* SWRaid_Info
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*
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* Cache of information about Linux Software RAID arrays so that the
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* mdadm command only needs to be executed once per refresh.
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*/
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#ifndef GPARTED_SWRAID_INFO_H
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#define GPARTED_SWRAID_INFO_H
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#include <glibmm/ustring.h>
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#include <vector>
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namespace GParted
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{
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class SWRaid_Info
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{
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public:
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static void load_cache();
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static bool is_member( const Glib::ustring & member_path );
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private:
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static void set_command_found();
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static void load_swraid_info_cache();
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static bool mdadm_found;
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static std::vector<Glib::ustring> swraid_info_cache;
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};
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}//GParted
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#endif /* GPARTED_SWRAID_INFO_H */
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@ -31,6 +31,7 @@ src/OperationLabelFileSystem.cc
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src/OperationNamePartition.cc
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src/OperationResizeMove.cc
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src/Partition.cc
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src/SWRaid_Info.cc
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src/TreeView_Detail.cc
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src/Utils.cc
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src/Win_GParted.cc
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@ -29,6 +29,7 @@
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#include "../include/OperationLabelFileSystem.h"
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#include "../include/OperationNamePartition.h"
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#include "../include/Proc_Partitions_Info.h"
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#include "../include/SWRaid_Info.h"
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#include "../include/btrfs.h"
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#include "../include/exfat.h"
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@ -165,6 +166,7 @@ void GParted_Core::set_devices_thread( std::vector<Device> * pdevices )
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DMRaid dmraid( true ) ; //Refresh cache of dmraid device information
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LVM2_PV_Info::clear_cache(); // Cache automatically loaded if and when needed
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btrfs::clear_cache(); // Cache incrementally loaded if and when needed
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SWRaid_Info::load_cache();
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init_maps() ;
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@ -1516,10 +1518,21 @@ FILESYSTEM GParted_Core::detect_filesystem( PedDevice * lp_device, PedPartition
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static Glib::ustring luks_unsupported = _("Linux Unified Key Setup encryption is not yet supported.");
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if ( lp_partition )
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{
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// Will query partition using methods: (Q1) SWRaid, (Q2) libparted,
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// (Q3) blkid, (Q4) internal
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path = get_partition_path( lp_partition );
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else
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// Will query whole disk device using methods: (Q1) SWRaid, (Q3) blkid,
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// (Q4) internal
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path = lp_device->path;
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// Standard libparted file system detection
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// (Q1) Linux Software RAID member detection
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if ( SWRaid_Info::is_member( path ) )
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return FS_LINUX_SWRAID;
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if ( lp_partition )
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{
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// (Q2) Standard libparted file system detection
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if ( lp_partition->fs_type )
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{
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fsname = lp_partition->fs_type->name;
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@ -1531,14 +1544,10 @@ FILESYSTEM GParted_Core::detect_filesystem( PedDevice * lp_device, PedPartition
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fsname = temp;
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}
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}
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else
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{
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// Querying whole disk device instead of libparted PedPartition
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path = lp_device->path;
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}
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//FS_Info (blkid) file system detection because current libparted (v2.2) does not
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// appear to detect file systems for sector sizes other than 512 bytes.
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// (Q3) FS_Info (blkid) file system detection
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// Originally just because libparted v2.2 didn't appear to detect file system for
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// sector sizes other than 512 bytes. Now to also detect what libparted doesn't.
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if ( fsname.empty() )
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{
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//TODO: blkid does not return anything for an "extended" partition. Need to handle this somehow
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@ -1609,7 +1618,7 @@ FILESYSTEM GParted_Core::detect_filesystem( PedDevice * lp_device, PedPartition
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return FS_ZFS;
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}
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// Fallback to GParted simple internal file system detection
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// (Q4) Fallback to GParted simple internal file system detection
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FILESYSTEM fstype = detect_filesystem_internal( lp_device, lp_partition );
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if ( fstype == FS_LUKS )
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messages.push_back( luks_unsupported );
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@ -49,6 +49,7 @@ gpartedbin_SOURCES = \
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Partition.cc \
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PipeCapture.cc \
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Proc_Partitions_Info.cc \
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SWRaid_Info.cc \
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TreeView_Detail.cc \
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Utils.cc \
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Win_GParted.cc \
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@ -0,0 +1,124 @@
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/* Copyright (C) 2015 Mike Fleetwood
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../include/SWRaid_Info.h"
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#include "../include/Utils.h"
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#include <glibmm/ustring.h>
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namespace GParted
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{
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// Data model:
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// mdadm_found - Is the "mdadm" command available?
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// swraid_info_cache - Vector of /dev entries of members in Linux Software RAID arrays.
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// E.g.
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// ["/dev/sda1", "/dev/sda2", ...]
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// Initialise static data elements
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bool SWRaid_Info::mdadm_found = false;
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std::vector<Glib::ustring> SWRaid_Info::swraid_info_cache;
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void SWRaid_Info::load_cache()
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{
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set_command_found();
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load_swraid_info_cache();
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}
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bool SWRaid_Info::is_member( const Glib::ustring & member_path )
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{
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for ( unsigned int i = 0 ; i < swraid_info_cache.size() ; i ++ )
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if ( member_path == swraid_info_cache[i] )
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return true;
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return false;
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}
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// Private methods
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void SWRaid_Info::set_command_found()
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{
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mdadm_found = ! Glib::find_program_in_path( "mdadm" ).empty();
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}
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void SWRaid_Info::load_swraid_info_cache()
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{
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Glib::ustring output, error;
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swraid_info_cache.clear();
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if ( ! mdadm_found )
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return;
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// Load SWRaid members into the cache.
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Glib::ustring cmd = "mdadm --examine --scan --verbose";
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if ( ! Utils::execute_command( cmd, output, error, true ) )
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{
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// Extract member /dev entries from Linux Software RAID arrays only,
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// excluding IMSM and DDF arrays. Example output:
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// ARRAY metadata=imsm UUID=...
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// devices=/dev/sdd,/dev/sdc,/dev/md/imsm0
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// ARRAY /dev/md/MyRaid container=...
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//
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// ARRAY /dev/md/1 level=raid1 metadata=1.0 num-devices=2 UUID=...
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// devices=/dev/sda1,/dev/sdb1
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// ARRAY /dev/md5 level=raid1 num-devices=2 UUID=...
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// devices=/dev/sda6,/dev/sdb6
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std::vector<Glib::ustring> lines;
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Utils::split( output, lines, "\n" );
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enum LINE_TYPE
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{
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LINE_TYPE_OTHER = 0,
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LINE_TYPE_ARRAY = 1,
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LINE_TYPE_DEVICES = 2
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};
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LINE_TYPE line_type = LINE_TYPE_OTHER;
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for ( unsigned int i = 0 ; i < lines.size() ; i ++ )
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{
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Glib::ustring metadata_type;
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if ( lines[i].substr( 0, 6 ) == "ARRAY " )
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{
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line_type = LINE_TYPE_ARRAY;
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Glib::ustring metadata_type = Utils::regexp_label( lines[i],
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"metadata=([[:graph:]]+)" );
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// Mdadm with these flags doesn't seem to print the
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// metadata tag for 0.90 version arrays. Accept no tag
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// (or empty version) as well as "0.90".
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if ( metadata_type != "" && metadata_type != "0.90" &&
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metadata_type != "1.0" && metadata_type != "1.1" &&
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metadata_type != "1.2" )
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// Skip mdadm reported non-Linux Software RAID arrays
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line_type = LINE_TYPE_OTHER;
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}
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else if ( line_type == LINE_TYPE_ARRAY &&
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lines[i].find( "devices=" ) != Glib::ustring::npos )
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{
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line_type = LINE_TYPE_DEVICES;
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Glib::ustring devices_str = Utils::regexp_label( lines[i],
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"devices=([[:graph:]]+)" );
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std::vector<Glib::ustring> devices;
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Utils::split( devices_str, devices, "," );
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for ( unsigned int j = 0 ; j < devices.size() ; j ++ )
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swraid_info_cache.push_back( devices[j] );
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}
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else
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line_type = LINE_TYPE_OTHER;
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}
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}
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}
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} //GParted
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