457 lines
16 KiB
C++
457 lines
16 KiB
C++
/* Copyright (C) 2009,2010 Luca Bruno <lucab@debian.org>
|
|
* Copyright (C) 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 "btrfs.h"
|
|
#include "BlockSpecial.h"
|
|
#include "FileSystem.h"
|
|
#include "Mount_Info.h"
|
|
#include "Partition.h"
|
|
#include "Utils.h"
|
|
|
|
#include <ctype.h>
|
|
#include <glibmm/ustring.h>
|
|
#include <glibmm/miscutils.h>
|
|
#include <glibmm/shell.h>
|
|
|
|
|
|
namespace GParted
|
|
{
|
|
|
|
// Cache of required btrfs file system device information by device
|
|
// E.g. For a single device btrfs on /dev/sda2 and a three device btrfs
|
|
// on /dev/sd[bcd]1 the cache would be as follows. (Note that
|
|
// BS(str) is short hand for constructor BlockSpecial(str)).
|
|
// btrfs_device_cache[BS("/dev/sda2")] = {devid=1, members=[BS("/dev/sda2")]}
|
|
// btrfs_device_cache[BS("/dev/sdb1")] = {devid=1, members=[BS("/dev/sdd1"), BS("/dev/sdc1"), BS("/dev/sdb1")]}
|
|
// btrfs_device_cache[BS("/dev/sdc1")] = {devid=2, members=[BS("/dev/sdd1"), BS("/dev/sdc1"), BS("/dev/sdb1")]}
|
|
// btrfs_device_cache[BS("/dev/sdd1")] = {devid=3, members=[BS("/dev/sdd1"), BS("/dev/sdc1"), BS("/dev/sdb1")]}
|
|
std::map<BlockSpecial, BTRFS_Device> btrfs_device_cache;
|
|
|
|
FS btrfs::get_filesystem_support()
|
|
{
|
|
FS fs( FS_BTRFS );
|
|
|
|
fs .busy = FS::EXTERNAL ;
|
|
|
|
if ( ! Glib::find_program_in_path( "mkfs.btrfs" ) .empty() )
|
|
{
|
|
fs.create = FS::EXTERNAL;
|
|
fs.create_with_label = FS::EXTERNAL;
|
|
}
|
|
|
|
if (! Glib::find_program_in_path("btrfs").empty())
|
|
{
|
|
// Use these btrfs multi-tool sub-commands without further checking for
|
|
// their availability:
|
|
// btrfs check
|
|
// btrfs filesystem label
|
|
// btrfs filesystem resize
|
|
// btrfs filesystem show
|
|
// btrfs inspect-internal dump-super
|
|
// as they are all available in btrfs-progs >= 4.5.
|
|
|
|
fs.read = FS::EXTERNAL;
|
|
fs .read_label = FS::EXTERNAL ;
|
|
fs .read_uuid = FS::EXTERNAL ;
|
|
fs.check = FS::EXTERNAL;
|
|
fs.write_label = FS::EXTERNAL;
|
|
fs.online_write_label = FS::EXTERNAL;
|
|
|
|
//Resizing of btrfs requires mount, umount and kernel
|
|
// support as well as btrfs filesystem resize
|
|
if ( ! Glib::find_program_in_path( "mount" ) .empty()
|
|
&& ! Glib::find_program_in_path( "umount" ) .empty()
|
|
&& fs .check
|
|
&& Utils::kernel_supports_fs( "btrfs" )
|
|
)
|
|
{
|
|
fs .grow = FS::EXTERNAL ;
|
|
if ( fs .read ) //needed to determine a minimum file system size.
|
|
fs .shrink = FS::EXTERNAL ;
|
|
}
|
|
}
|
|
|
|
if ( ! Glib::find_program_in_path( "btrfstune" ).empty() )
|
|
{
|
|
Utils::execute_command( "btrfstune --help", output, error, true );
|
|
if ( Utils::regexp_label( output + error, "^[[:blank:]]*(-u)[[:blank:]]" ) == "-u" )
|
|
fs.write_uuid = FS::EXTERNAL;
|
|
}
|
|
|
|
if ( fs .check )
|
|
{
|
|
fs.copy = FS::GPARTED;
|
|
fs.move = FS::GPARTED;
|
|
}
|
|
|
|
fs .online_read = FS::EXTERNAL ;
|
|
#ifdef ENABLE_ONLINE_RESIZE
|
|
if ( Utils::kernel_version_at_least( 3, 6, 0 ) )
|
|
{
|
|
fs .online_grow = fs .grow ;
|
|
fs .online_shrink = fs .shrink ;
|
|
}
|
|
#endif
|
|
|
|
fs_limits.min_size = 256 * MEBIBYTE;
|
|
|
|
return fs ;
|
|
}
|
|
|
|
bool btrfs::is_busy( const Glib::ustring & path )
|
|
{
|
|
//A btrfs file system is busy if any of the member devices are mounted.
|
|
// WARNING:
|
|
// Removal of the mounting device from a btrfs file system makes it impossible to
|
|
// determine whether the file system is mounted or not for linux <= 3.4. This is
|
|
// because /proc/mounts continues to show the old device which is no longer a
|
|
// member of the file system. Fixed in linux 3.5 by commit:
|
|
// Btrfs: implement ->show_devname
|
|
// https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9c5085c147989d48dfe74194b48affc23f376650
|
|
return ! get_mount_device( path ) .empty() ;
|
|
}
|
|
|
|
bool btrfs::create( const Partition & new_partition, OperationDetail & operationdetail )
|
|
{
|
|
return ! execute_command( "mkfs.btrfs -L " + Glib::shell_quote( new_partition.get_filesystem_label() ) +
|
|
" " + Glib::shell_quote( new_partition.get_path() ),
|
|
operationdetail, EXEC_CHECK_STATUS );
|
|
}
|
|
|
|
bool btrfs::check_repair( const Partition & partition, OperationDetail & operationdetail )
|
|
{
|
|
return ! execute_command("btrfs check " + Glib::shell_quote(partition.get_path()),
|
|
operationdetail, EXEC_CHECK_STATUS);
|
|
}
|
|
|
|
|
|
void btrfs::set_used_sectors(Partition& partition)
|
|
{
|
|
// Called when the file system is unmounted *and* when mounted.
|
|
//
|
|
// Btrfs has a volume manager layer within the file system which allows it to
|
|
// provide multiple levels of data redundancy, RAID levels, and use multiple
|
|
// devices both of which can be changed while the file system is mounted. To
|
|
// achieve this btrfs has to allocate space at two different levels: (1) chunks of
|
|
// 256 MiB or more at the volume manager level; and (2) extents at the metadata
|
|
// and file data level.
|
|
// References:
|
|
// * Btrfs: Working with multiple devices
|
|
// https://lwn.net/Articles/577961/
|
|
// * Btrfs wiki: Glossary
|
|
// https://btrfs.wiki.kernel.org/index.php/Glossary
|
|
//
|
|
// This makes the question of how much disk space is being used in an individual
|
|
// device a complicated question to answer. Additionally, even if there is a
|
|
// correct answer for the usage / minimum size a device can be, a multi-device
|
|
// btrfs can and does relocate extents to other devices allowing it to be shrunk
|
|
// smaller than it's minimum size (redundancy requirements of chunks permitting).
|
|
//
|
|
// Btrfs inspect-internal dump-super provides chunk allocation information for the
|
|
// current device only and a single file system wide extent level usage figure.
|
|
// Calculate the per device used figure as the fraction of file system wide extent
|
|
// usage apportioned per device.
|
|
//
|
|
// Example:
|
|
// # btrfs filesystem show --raw /dev/sdb1
|
|
// Label: none uuid: 68195e7e-c13f-4095-945f-675af4b1a451
|
|
// Total devices 2 FS bytes used 178749440
|
|
// devid 1 size 2147483648 used 239861760 path /dev/sdb1
|
|
// devid 2 size 2147483648 used 436207616 path /dev/sdc1
|
|
//
|
|
// # btrfs inspect-internal dump-super /dev/sdb1 | egrep 'total_bytes|bytes_used|sectorsize|devid'
|
|
// total_bytes 4294967296
|
|
// bytes_used 178749440
|
|
// sectorsize 4096
|
|
// dev_item.total_bytes 2147483648
|
|
// dev_item.bytes_used 239861760
|
|
// dev_item.devid 1
|
|
//
|
|
// Calculation:
|
|
// ptn_fs_size = dev_item_total_bytes
|
|
// ptn_fs_used = bytes_used * dev_item_total_bytes / total_bytes
|
|
//
|
|
// This calculation also ignores that btrfs allocates chunks at the volume manager
|
|
// level. So when fully compacted there will be partially filled chunks for
|
|
// metadata and data for each storage profile (RAID level) not accounted for.
|
|
Utils::execute_command("btrfs inspect-internal dump-super " + Glib::shell_quote(partition.get_path()),
|
|
output, error, true);
|
|
// btrfs inspect-internal dump-super returns zero exit status for both success and
|
|
// failure. Instead use non-empty stderr to identify failure.
|
|
if (! error.empty())
|
|
{
|
|
if (! output.empty())
|
|
partition.push_back_message(output);
|
|
if (! error.empty())
|
|
partition.push_back_message(error);
|
|
return;
|
|
}
|
|
|
|
// Btrfs file system wide size (sum of devid sizes)
|
|
long long total_bytes = -1;
|
|
Glib::ustring::size_type index = output.find("\ntotal_bytes");
|
|
if (index < output.length())
|
|
sscanf(output.substr(index).c_str(), "\ntotal_bytes %lld", &total_bytes);
|
|
|
|
// Btrfs file system wide used bytes
|
|
long long bytes_used = -1;
|
|
index = output.find("\nbytes_used");
|
|
if (index < output.length())
|
|
sscanf(output.substr(index).c_str(), "\nbytes_used %lld", &bytes_used);
|
|
|
|
// Sector size
|
|
long long sector_size = -1;
|
|
index = output.find("\nsectorsize");
|
|
if (index < output.length())
|
|
sscanf(output.substr(index).c_str(), "\nsectorsize %lld", §or_size);
|
|
|
|
// Btrfs this device size
|
|
long long dev_item_total_bytes = -1;
|
|
index = output.find("\ndev_item.total_bytes");
|
|
if (index < output.length())
|
|
sscanf(output.substr(index).c_str(), "\ndev_item.total_bytes %lld", &dev_item_total_bytes);
|
|
|
|
if (total_bytes > -1 && bytes_used > -1 && dev_item_total_bytes > -1 && sector_size > -1)
|
|
{
|
|
Sector ptn_fs_size = dev_item_total_bytes / partition.sector_size;
|
|
double devid_size_fraction = dev_item_total_bytes / double(total_bytes);
|
|
Sector ptn_fs_used = Utils::round(bytes_used * devid_size_fraction) / partition.sector_size;
|
|
Sector ptn_fs_free = ptn_fs_size - ptn_fs_used;
|
|
partition.set_sector_usage(ptn_fs_size, ptn_fs_free);
|
|
partition.fs_block_size = sector_size;
|
|
}
|
|
}
|
|
|
|
|
|
bool btrfs::write_label( const Partition & partition, OperationDetail & operationdetail )
|
|
{
|
|
// Use the mount point when labelling a mounted btrfs, or block device containing
|
|
// the unmounted btrfs.
|
|
// btrfs filesystem label '/dev/PTN' 'NEWLABEL'
|
|
// btrfs filesystem label '/MNTPNT' 'NEWLABEL'
|
|
Glib::ustring path;
|
|
if (partition.busy)
|
|
path = partition.get_mountpoint();
|
|
else
|
|
path = partition.get_path();
|
|
|
|
return ! execute_command("btrfs filesystem label " + Glib::shell_quote(path) +
|
|
" " + Glib::shell_quote(partition.get_filesystem_label()),
|
|
operationdetail, EXEC_CHECK_STATUS);
|
|
}
|
|
|
|
|
|
bool btrfs::resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition )
|
|
{
|
|
bool success = true ;
|
|
const Glib::ustring& path = partition_new.get_path();
|
|
const BTRFS_Device& btrfs_dev = get_cache_entry(path);
|
|
|
|
if ( btrfs_dev .devid == -1 )
|
|
{
|
|
operationdetail .add_child( OperationDetail(
|
|
Glib::ustring::compose( _("Failed to find devid for path %1"), path ), STATUS_ERROR ) ) ;
|
|
return false ;
|
|
}
|
|
Glib::ustring devid_str = Utils::num_to_str( btrfs_dev .devid ) ;
|
|
|
|
Glib::ustring mount_point ;
|
|
if ( ! partition_new .busy )
|
|
{
|
|
mount_point = mk_temp_dir( "", operationdetail ) ;
|
|
if ( mount_point .empty() )
|
|
return false ;
|
|
success &= ! execute_command( "mount -v -t btrfs " + Glib::shell_quote( path ) +
|
|
" " + Glib::shell_quote( mount_point ),
|
|
operationdetail, EXEC_CHECK_STATUS );
|
|
}
|
|
else
|
|
{
|
|
mount_point = Utils::first_directory(partition_new.get_mountpoints());
|
|
if (mount_point.empty())
|
|
{
|
|
Glib::ustring mount_list = Glib::build_path(", ", partition_new.get_mountpoints());
|
|
operationdetail.add_child(OperationDetail(
|
|
Glib::ustring::compose(_("No directory mount point found in %1"), mount_list),
|
|
STATUS_ERROR));
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if ( success )
|
|
{
|
|
Glib::ustring size ;
|
|
if ( ! fill_partition )
|
|
size = Utils::num_to_str(partition_new.get_byte_length() / KIBIBYTE) + "K";
|
|
else
|
|
size = "max" ;
|
|
success &= ! execute_command("btrfs filesystem resize " + devid_str + ":" + size +
|
|
" " + Glib::shell_quote(mount_point),
|
|
operationdetail, EXEC_CHECK_STATUS);
|
|
|
|
if ( ! partition_new .busy )
|
|
success &= ! execute_command( "umount -v " + Glib::shell_quote( mount_point ),
|
|
operationdetail, EXEC_CHECK_STATUS );
|
|
}
|
|
|
|
if ( ! partition_new .busy )
|
|
rm_temp_dir( mount_point, operationdetail ) ;
|
|
|
|
return success ;
|
|
}
|
|
|
|
|
|
void btrfs::read_label(Partition& partition)
|
|
{
|
|
exit_status = Utils::execute_command("btrfs filesystem label " + Glib::shell_quote(partition.get_path()),
|
|
output, error, true);
|
|
if (exit_status != 0)
|
|
{
|
|
if (! output.empty())
|
|
partition.push_back_message(output);
|
|
if (! error.empty())
|
|
partition.push_back_message(error);
|
|
return;
|
|
}
|
|
|
|
partition.set_filesystem_label(Utils::trim_trailing_new_line(output));
|
|
}
|
|
|
|
|
|
void btrfs::read_uuid(Partition& partition)
|
|
{
|
|
Utils::execute_command("btrfs inspect-internal dump-super " + Glib::shell_quote(partition.get_path()),
|
|
output, error, true);
|
|
// btrfs inspect-internal dump-super returns zero exit status for both success and
|
|
// failure. Instead use non-empty stderr to identify failure.
|
|
if (! error.empty())
|
|
{
|
|
if (! output.empty())
|
|
partition.push_back_message(output);
|
|
if (! error.empty())
|
|
partition.push_back_message(error);
|
|
return;
|
|
}
|
|
|
|
partition.uuid = Utils::regexp_label(output, "^fsid[[:blank:]]*(" RFC4122_NONE_NIL_UUID_REGEXP ")");
|
|
}
|
|
|
|
|
|
bool btrfs::write_uuid( const Partition & partition, OperationDetail & operationdetail )
|
|
{
|
|
return ! execute_command( "btrfstune -f -u " + Glib::shell_quote( partition.get_path() ),
|
|
operationdetail, EXEC_CHECK_STATUS );
|
|
}
|
|
|
|
void btrfs::clear_cache()
|
|
{
|
|
btrfs_device_cache .clear() ;
|
|
}
|
|
|
|
//Return the device which is mounting the btrfs in this partition.
|
|
// Return empty string if not found (not mounted).
|
|
Glib::ustring btrfs::get_mount_device( const Glib::ustring & path )
|
|
{
|
|
const BTRFS_Device& btrfs_dev = get_cache_entry(path);
|
|
|
|
if ( btrfs_dev .devid == -1 || btrfs_dev .members .empty() )
|
|
{
|
|
//WARNING:
|
|
// No btrfs device cache entry found or entry without any member devices.
|
|
// Use fallback busy detection method which can only determine if the
|
|
// mounting device is mounted or not, not any of the other members of a
|
|
// multi-device btrfs file system.
|
|
if ( Mount_Info::is_dev_mounted( path ) )
|
|
return path ;
|
|
return "" ;
|
|
}
|
|
|
|
for ( unsigned int i = 0 ; i < btrfs_dev .members .size() ; i ++ )
|
|
if ( Mount_Info::is_dev_mounted( btrfs_dev.members[i] ) )
|
|
return btrfs_dev.members[i].m_name;
|
|
return "" ;
|
|
}
|
|
|
|
std::vector<Glib::ustring> btrfs::get_members( const Glib::ustring & path )
|
|
{
|
|
const BTRFS_Device& btrfs_dev = get_cache_entry(path);
|
|
std::vector<Glib::ustring> membs;
|
|
for ( unsigned int i = 0 ; i < btrfs_dev.members.size() ; i ++ )
|
|
membs.push_back( btrfs_dev.members[i].m_name );
|
|
return membs;
|
|
}
|
|
|
|
//Private methods
|
|
|
|
//Return btrfs device cache entry, incrementally loading cache as required
|
|
const BTRFS_Device & btrfs::get_cache_entry( const Glib::ustring & path )
|
|
{
|
|
std::map<BlockSpecial, BTRFS_Device>::const_iterator bd_iter = btrfs_device_cache.find( BlockSpecial( path ) );
|
|
if ( bd_iter != btrfs_device_cache .end() )
|
|
return bd_iter ->second ;
|
|
|
|
Glib::ustring output, error ;
|
|
std::vector<int> devid_list ;
|
|
std::vector<Glib::ustring> path_list ;
|
|
Utils::execute_command("btrfs filesystem show " + Glib::shell_quote(path), output, error, true);
|
|
//In many cases the exit status doesn't reflect valid output or an error condition
|
|
// so rely on parsing the output to determine success.
|
|
|
|
//Extract devid and path for each device from output like this:
|
|
// Label: none uuid: 36eb51a2-2927-4c92-820f-b2f0b5cdae50
|
|
// Total devices 2 FS bytes used 156.00KB
|
|
// devid 2 size 2.00GB used 512.00MB path /dev/sdb2
|
|
// devid 1 size 2.00GB used 240.75MB path /dev/sdb1
|
|
Glib::ustring::size_type offset = 0 ;
|
|
Glib::ustring::size_type index ;
|
|
while ( ( index = output .find( "devid ", offset ) ) != Glib::ustring::npos )
|
|
{
|
|
int devid = -1 ;
|
|
sscanf( output .substr( index ) .c_str(), "devid %d", &devid ) ;
|
|
Glib::ustring devid_path = Utils::regexp_label( output .substr( index ),
|
|
"devid .* path (/dev/[[:graph:]]+)" ) ;
|
|
if ( devid > -1 && ! devid_path .empty() )
|
|
{
|
|
devid_list .push_back( devid ) ;
|
|
path_list .push_back( devid_path ) ;
|
|
}
|
|
offset = index + 5 ; //Next find starts immediately after current "devid"
|
|
}
|
|
//Add cache entries for all found devices
|
|
std::vector<BlockSpecial> bs_list;
|
|
for ( unsigned int i = 0 ; i < path_list.size() ; i ++ )
|
|
bs_list.push_back( BlockSpecial( path_list[i] ) );
|
|
for ( unsigned int i = 0 ; i < devid_list .size() ; i ++ )
|
|
{
|
|
BTRFS_Device btrfs_dev ;
|
|
btrfs_dev .devid = devid_list[ i ] ;
|
|
btrfs_dev.members = bs_list;
|
|
btrfs_device_cache[ BlockSpecial( path_list[i] ) ] = btrfs_dev;
|
|
}
|
|
|
|
bd_iter = btrfs_device_cache.find( BlockSpecial( path ) );
|
|
if ( bd_iter != btrfs_device_cache .end() )
|
|
return bd_iter ->second ;
|
|
|
|
//If for any reason we fail to parse the information return an "unknown" record
|
|
static BTRFS_Device btrfs_dev = { -1, } ;
|
|
return btrfs_dev ;
|
|
}
|
|
|
|
|
|
} //GParted
|