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gparted/src/ext2.cc

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/* Copyright (C) 2004 Bart
* Copyright (C) 2008, 2009, 2010, 2011 Curtis Gedak
*
* 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 "../include/ext2.h"
namespace GParted
{
FS ext2::get_filesystem_support()
{
FS fs ;
fs .filesystem = specific_type;
fs .busy = FS::GPARTED ;
// Only enable functionality if the relevant mkfs.extX command is found to ensure
// that the version of e2fsprogs is new enough to support ext4. Applying to
// ext2/3 is OK as relevant mkfs.ext2/3 commands exist. Also for ext4 only, check
// for e4fsprogs commands to support RHEL/CentOS 5.x which uses a separate package
// to provide ext4 support. The existing e2fsprogs commands only support ext2/3.
if ( ! Glib::find_program_in_path( "mkfs." + Utils::get_filesystem_string( specific_type ) ).empty() )
{
mkfs_cmd = "mkfs." + Utils::get_filesystem_string( specific_type );
fs .create = FS::EXTERNAL ;
fs .create_with_label = FS::EXTERNAL ;
if ( specific_type == FS_EXT4 && ! Glib::find_program_in_path( "dumpe4fs" ).empty() )
dump_cmd = "dumpe4fs";
else if ( ! Glib::find_program_in_path( "dumpe2fs" ).empty() )
dump_cmd = "dumpe2fs";
if ( dump_cmd != "" )
fs .read = FS::EXTERNAL ;
if ( specific_type == FS_EXT4 && ! Glib::find_program_in_path( "tune4fs" ).empty() )
tune_cmd = "tune4fs";
else if ( ! Glib::find_program_in_path( "tune2fs" ).empty() )
tune_cmd = "tune2fs";
if ( tune_cmd != "" )
{
fs .read_uuid = FS::EXTERNAL ;
fs .write_uuid = FS::EXTERNAL ;
}
if ( specific_type == FS_EXT4 && ! Glib::find_program_in_path( "e4label" ).empty() )
label_cmd = "e4label";
else if ( ! Glib::find_program_in_path( "e2label" ).empty() )
label_cmd = "e2label";
if ( label_cmd != "" )
{
fs .read_label = FS::EXTERNAL ;
fs .write_label = FS::EXTERNAL ;
}
if ( specific_type == FS_EXT4 && ! Glib::find_program_in_path( "e4fsck" ).empty() )
fsck_cmd = "e4fsck";
else if ( ! Glib::find_program_in_path( "e2fsck" ).empty() )
fsck_cmd = "e2fsck";
if ( fsck_cmd != "" )
fs .check = FS::EXTERNAL ;
if ( specific_type == FS_EXT4 && ! Glib::find_program_in_path( "resize4fs" ).empty() )
resize_cmd = "resize4fs";
else if ( ! Glib::find_program_in_path( "resize2fs" ).empty() )
resize_cmd = "resize2fs";
if ( resize_cmd != "" && fs .check )
{
fs .grow = FS::EXTERNAL ;
if ( fs .read ) //needed to determine a min file system size..
fs .shrink = FS::EXTERNAL ;
}
if ( fs .check )
{
fs.copy = fs.move = FS::GPARTED ;
//If supported, use e2image to copy/move the file system as it
// only copies used blocks, skipping unused blocks. This is more
// efficient than copying all blocks used by GParted's internal
// method.
if ( specific_type == FS_EXT4 && ! Glib::find_program_in_path( "e4image" ).empty() )
image_cmd = "e4image";
else if ( ! Glib::find_program_in_path( "e2image" ).empty() )
image_cmd = "e2image";
if ( image_cmd != "" )
{
Utils::execute_command( image_cmd, output, error, true ) ;
if ( Utils::regexp_label( error, "(-o src_offset)" ) == "-o src_offset" )
fs.copy = fs.move = FS::EXTERNAL ;
}
}
fs .online_read = FS::EXTERNAL ;
#ifdef ENABLE_ONLINE_RESIZE
if ( specific_type != FS_EXT2 && Utils::kernel_version_at_least( 3, 6, 0 ) )
fs .online_grow = fs .grow ;
#endif
}
return fs ;
}
void ext2::set_used_sectors( Partition & partition )
{
//Called when file system is unmounted *and* when mounted. Always read
// the file system size from the on disk superblock using dumpe2fs to
// avoid overhead subtraction. Read the free space from the kernel via
// the statvfs() system call when mounted and from the superblock when
// unmounted.
if ( ! Utils::execute_command( dump_cmd + " -h " + partition .get_path(), output, error, true ) )
{
index = output .find( "Block count:" ) ;
if ( index >= output .length() ||
sscanf( output.substr( index ) .c_str(), "Block count: %Ld", &T ) != 1 )
T = -1 ;
index = output .find( "Block size:" ) ;
if ( index >= output.length() ||
sscanf( output.substr( index ) .c_str(), "Block size: %Ld", &S ) != 1 )
S = -1 ;
if ( T > -1 && S > -1 )
T = Utils::round( T * ( S / double(partition .sector_size) ) ) ;
if ( partition .busy )
{
Byte_Value ignored ;
Byte_Value fs_free ;
if ( Utils::get_mounted_filesystem_usage( partition .get_mountpoint(),
ignored, fs_free, error ) == 0 )
N = Utils::round( fs_free / double(partition .sector_size) ) ;
else
{
N = -1 ;
partition .messages .push_back( error ) ;
}
}
else
{
index = output .find( "Free blocks:" ) ;
if ( index >= output .length() ||
sscanf( output.substr( index ) .c_str(), "Free blocks: %Ld", &N ) != 1 )
N = -1 ;
if ( N > -1 && S > -1 )
N = Utils::round( N * ( S / double(partition .sector_size) ) ) ;
}
if ( T > -1 && N > -1 )
partition .set_sector_usage( T, N ) ;
}
else
{
if ( ! output .empty() )
partition .messages .push_back( output ) ;
if ( ! error .empty() )
partition .messages .push_back( error ) ;
}
}
void ext2::read_label( Partition & partition )
{
if ( ! Utils::execute_command( label_cmd + " " + partition .get_path(), output, error, true ) )
{
partition.set_filesystem_label( Utils::trim( output ) );
}
else
{
if ( ! output .empty() )
partition .messages .push_back( output ) ;
if ( ! error .empty() )
partition .messages .push_back( error ) ;
}
}
bool ext2::write_label( const Partition & partition, OperationDetail & operationdetail )
{
return ! execute_command( label_cmd + " " + partition.get_path() +
" \"" + partition.get_filesystem_label() + "\"",
operationdetail, EXEC_CHECK_STATUS );
}
void ext2::read_uuid( Partition & partition )
{
if ( ! Utils::execute_command( tune_cmd + " -l " + partition .get_path(), output, error, true ) )
{
partition .uuid = Utils::regexp_label( output, "^Filesystem UUID:[[:blank:]]*(" RFC4122_NONE_NIL_UUID_REGEXP ")" ) ;
}
else
{
if ( ! output .empty() )
partition .messages .push_back( output ) ;
if ( ! error .empty() )
partition .messages .push_back( error ) ;
}
}
bool ext2::write_uuid( const Partition & partition, OperationDetail & operationdetail )
{
return ! execute_command( tune_cmd + " -U random " + partition .get_path(),
operationdetail, EXEC_CHECK_STATUS );
}
bool ext2::create( const Partition & new_partition, OperationDetail & operationdetail )
{
return ! execute_command( mkfs_cmd + " -F -L \"" + new_partition.get_filesystem_label() + "\" " +
new_partition.get_path(),
operationdetail, EXEC_CHECK_STATUS|EXEC_CANCEL_SAFE );
}
bool ext2::resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition )
{
Glib::ustring str_temp = resize_cmd + " -p " + partition_new .get_path() ;
if ( ! fill_partition )
str_temp += " " + Utils::num_to_str( floor( Utils::sector_to_unit(
partition_new .get_sector_length(), partition_new .sector_size, UNIT_KIB ) ) ) + "K";
return ! execute_command( str_temp, operationdetail, EXEC_CHECK_STATUS );
}
bool ext2::check_repair( const Partition & partition, OperationDetail & operationdetail )
{
exit_status = execute_command( fsck_cmd + " -f -y -v -C 0 " + partition.get_path(), operationdetail,
EXEC_CANCEL_SAFE );
bool success = ( exit_status == 0 || exit_status == 1 || exit_status == 2 );
set_status( operationdetail, success );
return success;
}
bool ext2::move( const Partition & partition_new,
const Partition & partition_old,
OperationDetail & operationdetail )
{
Sector distance;
Glib::ustring offset;
distance = partition_old.sector_start - partition_new.sector_start;
offset = Utils::num_to_str( llabs(distance) * partition_new.sector_size );
if ( distance < 0 )
return ! execute_command( image_cmd + " -ra -p -o " + offset + " " + partition_new.get_path(),
operationdetail, EXEC_CHECK_STATUS|EXEC_CANCEL_SAFE );
else
return ! execute_command( image_cmd + " -ra -p -O " + offset + " " + partition_new.get_path(),
operationdetail, EXEC_CHECK_STATUS|EXEC_CANCEL_SAFE );
}
bool ext2::copy( const Partition & src_part,
Partition & dest_part,
OperationDetail & operationdetail )
{
return ! execute_command( image_cmd + " -ra -p " + src_part.get_path() + " " + dest_part.get_path(),
operationdetail, EXEC_CHECK_STATUS|EXEC_CANCEL_SAFE );
}
} //GParted
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