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/*
interface.c -- parted binding glue to libext2resize
Copyright (C) 1998-2000, 2007-2014, 2019-2022 Free Software Foundation,
Inc.
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 3 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/>.
*/
/* VERSION: libext2resize 1.1.6 (by Lennert)
* merged 1.1.11 changes (by Andrew)
*/
#include <config.h>
#include <parted/parted.h>
#include "ext2.h"
static PedFileSystemType _ext2_type;
static PedFileSystemType _ext3_type;
struct ext2_dev_handle* ext2_make_dev_handle_from_parted_geometry(PedGeometry* geom);
static PedGeometry*
_ext2_generic_probe (PedGeometry* geom, int expect_ext_ver)
{
struct ext2_super_block *sb;
const int sectors = (4096 + geom->dev->sector_size - 1) /
geom->dev->sector_size;
uint8_t *buf = alloca (sectors * geom->dev->sector_size);
if (!ped_geometry_read(geom, buf, 0, sectors))
return NULL;
sb = (struct ext2_super_block *)(buf+1024);
if (EXT2_SUPER_MAGIC(*sb) == EXT2_SUPER_MAGIC_CONST) {
PedSector block_size = (EXT2_MIN_BLOCK_SIZE << (EXT2_SUPER_LOG_BLOCK_SIZE(*sb))) / geom->dev->sector_size;
PedSector block_count = EXT2_SUPER_BLOCKS_COUNT(*sb);
PedSector group_blocks = EXT2_SUPER_BLOCKS_PER_GROUP(*sb);
PedSector group_nr = EXT2_SUPER_BLOCK_GROUP_NR(*sb);
PedSector first_data_block = EXT2_SUPER_FIRST_DATA_BLOCK(*sb);
int version = EXT2_SUPER_REV_LEVEL(*sb);
int is_ext3 = 0;
int is_ext4 = 0;
is_ext3 = (EXT2_SUPER_FEATURE_COMPAT (*sb)
& EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0;
if (is_ext3) {
is_ext4 = ((EXT2_SUPER_FEATURE_RO_COMPAT (*sb)
& EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
|| (EXT2_SUPER_FEATURE_RO_COMPAT (*sb)
& EXT4_FEATURE_RO_COMPAT_GDT_CSUM)
|| (EXT2_SUPER_FEATURE_RO_COMPAT (*sb)
& EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
|| (EXT2_SUPER_FEATURE_INCOMPAT (*sb)
& EXT4_FEATURE_INCOMPAT_EXTENTS)
|| (EXT2_SUPER_FEATURE_INCOMPAT (*sb)
& EXT4_FEATURE_INCOMPAT_64BIT)
|| (EXT2_SUPER_FEATURE_INCOMPAT (*sb)
& EXT4_FEATURE_INCOMPAT_FLEX_BG));
if (is_ext4)
is_ext3 = 0;
}
if (expect_ext_ver == 2 && (is_ext3 || is_ext4))
return NULL;
if (expect_ext_ver == 3 && !is_ext3)
return NULL;
else if (expect_ext_ver == 4 && !is_ext4)
return NULL;
if (version > 0 && group_nr > 0) {
PedSector start;
PedGeometry probe_geom;
start = geom->start
- group_blocks * group_nr
- first_data_block;
if (start < 0)
return NULL;
ped_geometry_init (&probe_geom, geom->dev,
start, block_count * block_size);
return _ext2_generic_probe (&probe_geom,
expect_ext_ver);
} else {
return ped_geometry_new (geom->dev, geom->start,
block_count * block_size);
}
}
return NULL;
}
static PedGeometry*
_ext2_probe (PedGeometry* geom)
{
return _ext2_generic_probe (geom, 2);
}
static PedGeometry*
_ext3_probe (PedGeometry* geom)
{
return _ext2_generic_probe (geom, 3);
}
static PedGeometry*
_ext4_probe (PedGeometry* geom)
{
return _ext2_generic_probe (geom, 4);
}
static PedFileSystemOps _ext2_ops = {
probe: _ext2_probe,
};
static PedFileSystemOps _ext3_ops = {
probe: _ext3_probe,
};
static PedFileSystemOps _ext4_ops = {
probe: _ext4_probe,
};
static PedFileSystemType _ext2_type = {
next: NULL,
ops: &_ext2_ops,
name: "ext2",
};
static PedFileSystemType _ext3_type = {
next: NULL,
ops: &_ext3_ops,
name: "ext3",
};
static PedFileSystemType _ext4_type = {
next: NULL,
ops: &_ext4_ops,
name: "ext4",
};
void ped_file_system_ext2_init ()
{
ped_file_system_type_register (&_ext2_type);
ped_file_system_type_register (&_ext3_type);
ped_file_system_type_register (&_ext4_type);
}
void ped_file_system_ext2_done ()
{
ped_file_system_type_unregister (&_ext2_type);
ped_file_system_type_unregister (&_ext3_type);
ped_file_system_type_unregister (&_ext4_type);
}
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