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/*
libparted - a library for manipulating disk partitions
Copyright (C) 2013-2014, 2019-2023 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/>.
*/
#include <config.h>
#include <parted/parted.h>
#include <parted/endian.h>
/* Located 64k inside the partition (start of the first btrfs superblock) */
#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
#define BTRFS_CSUM_SIZE 32
#define BTRFS_FSID_SIZE 16
static PedGeometry*
btrfs_probe (PedGeometry* geom)
{
union {
struct {
/* Just enough of the btrfs_super_block to get the magic */
uint8_t csum[BTRFS_CSUM_SIZE];
uint8_t fsid[BTRFS_FSID_SIZE];
uint64_t bytenr;
uint64_t flags;
uint64_t magic;
} sb;
int8_t sector[8192];
} buf;
PedSector offset = (64*1024)/geom->dev->sector_size;
if (geom->length < offset+1)
return 0;
if (!ped_geometry_read (geom, &buf, offset, 1))
return 0;
if (PED_LE64_TO_CPU(buf.sb.magic) == BTRFS_MAGIC) {
return ped_geometry_new (geom->dev, geom->start, geom->length);
}
return NULL;
}
static PedFileSystemOps btrfs_ops = {
probe: btrfs_probe,
};
static PedFileSystemType btrfs_type = {
next: NULL,
ops: &btrfs_ops,
name: "btrfs",
};
void
ped_file_system_btrfs_init ()
{
ped_file_system_type_register (&btrfs_type);
}
void
ped_file_system_btrfs_done ()
{
ped_file_system_type_unregister (&btrfs_type);
}
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