Mirrors
/
gparted
mirror of https://gitlab.gnome.org/GNOME/gparted.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
gparted/src/LVM2_PV_Info.cc

332 lines
10 KiB
C++
Raw Blame History

/* Copyright (C) 2012 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 Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "../include/LVM2_PV_Info.h"
namespace GParted
{
enum PV_ATTRIBUTE
{
PVATTR_PV_NAME = 0,
PVATTR_PV_SIZE = 1,
PVATTR_PV_FREE = 2,
PVATTR_VG_NAME = 3,
PVATTR_VG_BITS = 4,
PVATTR_LV_NAME = 5,
PVATTR_LV_BITS = 6
} ;
//Data model:
// lvm2_pv_info_cache_initialized
// - Has the cache been loaded let?
// lvm_found - Is the "lvm" command available?
// lvm2_pv_cache - String vector storing attributes of a PV.
// Attributes are: pv_name,pv_size,pv_free,
// vg_name,vg_attr,lv_name,lv_attr. Pv_size and
// pv_free are the size of the PV and number of
// free bytes. See vgs(8) and lvs(8) for details
// of vg_attr and lv_attr respectively.
// E.g.
// ["/dev/sda10,2147483648,2147483648,,r-----,,",
// "/dev/sda11,2143289344,2143289344,GParted-VG1,wz--n-,,",
// "/dev/sda12,2143289344,1619001344,GParted-VG2,wz--n-,lvol0,-wi---",
// "/dev/sda12,2143289344,1619001344,GParted-VG2,wz--n-,,",
// "/dev/sda13,2143289344,830472192,GParted_VG3,wz--n-,lvol0,-wi-a-",
// "/dev/sda13,2143289344,830472192,GParted_VG3,wz--n-,lvol1,-wi-a-",
// "/dev/sda13,2143289344,830472192,GParted_VG3,wz--n-,,",
// "/dev/sda14,2143289344,1828716544,GParted-VG4,wzx-n-,lvol0,-wi---",
// "/dev/sda14,2143289344,1828716544,GParted-VG4,wzx-n-,,"]
// error_messages - String vector storing whole cache error
// messsages.
//Initialize static data elements
bool LVM2_PV_Info::lvm2_pv_info_cache_initialized = false ;
bool LVM2_PV_Info::lvm_found = false ;
std::vector<Glib::ustring> LVM2_PV_Info::lvm2_pv_cache ;
std::vector<Glib::ustring> LVM2_PV_Info::error_messages ;
LVM2_PV_Info::LVM2_PV_Info()
{
}
LVM2_PV_Info::LVM2_PV_Info( bool do_refresh )
{
if ( do_refresh )
{
set_command_found() ;
load_lvm2_pv_info_cache() ;
lvm2_pv_info_cache_initialized = true ;
}
}
LVM2_PV_Info::~LVM2_PV_Info()
{
}
bool LVM2_PV_Info::is_lvm2_pv_supported()
{
if ( ! lvm2_pv_info_cache_initialized )
set_command_found() ;
return ( lvm_found ) ;
}
Glib::ustring LVM2_PV_Info::get_vg_name( const Glib::ustring & path )
{
initialize_if_required() ;
return get_pv_attr_by_path( path, PVATTR_VG_NAME ) ;
}
//Return PV size in bytes, or -1 for error.
Byte_Value LVM2_PV_Info::get_size_bytes( const Glib::ustring & path )
{
initialize_if_required() ;
Glib::ustring str = get_pv_attr_by_path( path, PVATTR_PV_SIZE ) ;
return lvm2_pv_attr_to_num( str ) ;
}
//Return number of free bytes in the PV, or -1 for error.
Byte_Value LVM2_PV_Info::get_free_bytes( const Glib::ustring & path )
{
initialize_if_required() ;
Glib::ustring str = get_pv_attr_by_path( path, PVATTR_PV_FREE ) ;
return lvm2_pv_attr_to_num( str ) ;
}
//Report if any LVs are active in the VG stored in the PV.
bool LVM2_PV_Info::has_active_lvs( const Glib::ustring & path )
{
initialize_if_required() ;
Glib::ustring vgname = get_pv_attr_by_path( path, PVATTR_VG_NAME ) ;
if ( vgname == "" )
//PV not yet included in any VG
return false ;
for ( unsigned int i = 0 ; i < lvm2_pv_cache .size() ; i ++ )
{
std::vector<Glib::ustring> pv_attrs ;
Utils::split( lvm2_pv_cache [i], pv_attrs, "," ) ;
if ( vgname == get_pv_attr_by_row( i, PVATTR_VG_NAME ) )
{
Glib::ustring lv_bits = get_pv_attr_by_row( i, PVATTR_LV_BITS ) ;
//5th "bit" is active status. E.g.
// "-wi---" inactive, "-wi-a-" active, ...
// Treat any non-hyphen character as active.
if ( lv_bits .length() >= 5 && lv_bits [4] != '-' )
//LV in VG is active
return true ;
}
}
return false ;
}
//Report if the VG is exported.
bool LVM2_PV_Info::is_vg_exported( const Glib::ustring & vgname )
{
initialize_if_required() ;
for ( unsigned int i = 0 ; i < lvm2_pv_cache .size() ; i ++ )
{
std::vector<Glib::ustring> pv_attrs ;
Utils::split( lvm2_pv_cache [i], pv_attrs, "," ) ;
if ( vgname == get_pv_attr_by_row( i, PVATTR_VG_NAME ) )
{
Glib::ustring vg_bits = get_pv_attr_by_row( i, PVATTR_VG_BITS ) ;
//3rd "bit" is export status. E.g.
// "wz--n-" imported, "wzx-n-" exported.
// Treat any non-hyphen character as exported.
if ( vg_bits .length() >= 3 && vg_bits [2] != '-' )
//VG is exported
return true ;
}
}
return false ;
}
//Return vector of PVs which are members of the VG. Passing "" returns all empty PVs.
std::vector<Glib::ustring> LVM2_PV_Info::get_vg_members( const Glib::ustring & vgname )
{
initialize_if_required() ;
std::vector<Glib::ustring> members ;
//Generate array of unique PV member names of a VG
for ( unsigned int i = 0 ; i < lvm2_pv_cache .size() ; i ++ )
{
if ( vgname == get_pv_attr_by_row( i, PVATTR_VG_NAME ) )
{
bool already_added = false ;
Glib::ustring pvname = get_pv_attr_by_row( i, PVATTR_PV_NAME ) ;
for ( unsigned int j = 0 ; j < members .size() ; j ++ )
{
if ( pvname == members[ j ] )
{
already_added = true ;
break ;
}
}
if ( ! already_added )
{
members .push_back( get_pv_attr_by_row( i, PVATTR_PV_NAME ) ) ;
}
}
}
return members ;
}
std::vector<Glib::ustring> LVM2_PV_Info::get_error_messages( const Glib::ustring & path )
{
initialize_if_required() ;
if ( ! error_messages .empty() )
//Return whole cache error messages as first choice
return error_messages ;
std::vector<Glib::ustring> partition_specific_messages ;
partition_specific_messages .clear() ;
Glib::ustring temp ;
//Check for partition specific message: partial VG
Glib::ustring vg_bits = get_pv_attr_by_path( path, PVATTR_VG_BITS ) ;
//4rd "bit" is partial flag. E.g.
// "wz--n-" all PVs exist, "wz-pn-" one or move PVs missing.
// Treat any non-hyphen character as damaged.
if ( vg_bits .length() >= 4 && vg_bits [3] != '-' )
{
temp = _("One or more Physical Volumes belonging to the Volume Group is missing.") ;
temp += "\n" ;
partition_specific_messages .push_back ( temp ) ;
}
return partition_specific_messages ;
}
//Private methods
void LVM2_PV_Info::initialize_if_required()
{
if ( ! lvm2_pv_info_cache_initialized )
{
set_command_found() ;
load_lvm2_pv_info_cache() ;
lvm2_pv_info_cache_initialized = true ;
}
}
void LVM2_PV_Info::set_command_found()
{
//Set status of command found
lvm_found = ( ! Glib::find_program_in_path( "lvm" ) .empty() ) ;
}
void LVM2_PV_Info::load_lvm2_pv_info_cache()
{
Glib::ustring output, error ;
lvm2_pv_cache .clear() ;
error_messages .clear() ;
if ( lvm_found )
{
//The OS is expected to fully enable LVM, this scan does
// not do the full job. It is included incase anything
// is changed not using lvm commands.
Utils::execute_command( "lvm vgscan", output, error, true ) ;
//Load LVM2 PV attribute cache. Output PV attributes in
// PV_ATTRIBUTE order
Glib::ustring cmd = "lvm pvs --config \"log{command_names=0}\" --nosuffix --noheadings --separator , --units b -o pv_name,pv_size,pv_free,vg_name,vg_attr,lv_name,lv_attr" ;
if ( ! Utils::execute_command( cmd, output, error, true ) )
{
if ( output != "" )
{
Utils::tokenize( output, lvm2_pv_cache, "\n" ) ;
for ( unsigned int i = 0 ; i < lvm2_pv_cache .size() ; i ++ )
lvm2_pv_cache [i] = Utils::trim( lvm2_pv_cache [i] ) ;
}
}
else
{
error_messages .push_back( cmd ) ;
if ( ! output .empty() )
error_messages .push_back ( output ) ;
if ( ! error .empty() )
error_messages .push_back ( error ) ;
Glib::ustring temp ;
temp = _("An error occurred reading LVM2 configuration!") ;
temp += "\n" ;
temp += _("Some or all of the details might be missing or incorrect.") ;
temp += "\n" ;
temp += _("You should NOT modify any LVM2 PV partitions.") ;
temp += "\n" ;
error_messages .push_back( temp ) ;
}
}
}
//Return PV's nth attribute. Performs linear search of the cache and
// uses the first matching PV entry. Attributes are numbered 0 upward
// using PV_ATTRIBUTE enumeration.
Glib::ustring LVM2_PV_Info::get_pv_attr_by_path( const Glib::ustring & path, unsigned int entry )
{
for ( unsigned int i = 0 ; i < lvm2_pv_cache .size() ; i ++ )
{
std::vector<Glib::ustring> pv_attrs ;
Utils::split( lvm2_pv_cache [i], pv_attrs, "," ) ;
if ( PVATTR_PV_NAME < pv_attrs .size() && path == pv_attrs [PVATTR_PV_NAME] )
{
if ( entry < pv_attrs .size() )
return pv_attrs [entry] ;
else
break ;
}
}
return "" ;
}
//Return PV's nth attribute from specified cache row. Row is numbered
// 0 upwards and attributes are numbers numbered 0 upwards using
// PV_ATTRIBUTE enumeration.
Glib::ustring LVM2_PV_Info::get_pv_attr_by_row( unsigned int row, unsigned int entry )
{
if ( row >= lvm2_pv_cache .size() )
return "" ;
std::vector<Glib::ustring> pv_attrs ;
Utils::split( lvm2_pv_cache [row], pv_attrs, "," ) ;
if ( entry < pv_attrs .size() )
return pv_attrs [entry] ;
return "" ;
}
//Return string converted to a number, or -1 for error.
//Used to convert PVs size or free bytes.
Byte_Value LVM2_PV_Info::lvm2_pv_attr_to_num( const Glib::ustring str )
{
Byte_Value num = -1 ;
if ( str != "" )
{
gchar * suffix ;
num = (Byte_Value) g_ascii_strtoll( str .c_str(), & suffix, 10 ) ;
if ( num < 0 || ( num == 0 && suffix == str ) )
//Negative number or conversion failed
num = -1 ;
}
return num ;
}
}//GParted
Reference in New Issue View Git Blame Copy Permalink