78 lines
2.2 KiB
C
Executable File
78 lines
2.2 KiB
C
Executable File
/*
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libparted - a library for manipulating disk partitions
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Copyright (C) 2013-2014, 2019-2023 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <parted/parted.h>
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#include <parted/endian.h>
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/* Located 64k inside the partition (start of the first btrfs superblock) */
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#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
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#define BTRFS_CSUM_SIZE 32
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#define BTRFS_FSID_SIZE 16
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static PedGeometry*
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btrfs_probe (PedGeometry* geom)
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{
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union {
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struct {
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/* Just enough of the btrfs_super_block to get the magic */
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uint8_t csum[BTRFS_CSUM_SIZE];
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uint8_t fsid[BTRFS_FSID_SIZE];
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uint64_t bytenr;
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uint64_t flags;
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uint64_t magic;
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} sb;
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int8_t sector[8192];
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} buf;
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PedSector offset = (64*1024)/geom->dev->sector_size;
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if (geom->length < offset+1)
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return 0;
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if (!ped_geometry_read (geom, &buf, offset, 1))
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return 0;
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if (PED_LE64_TO_CPU(buf.sb.magic) == BTRFS_MAGIC) {
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return ped_geometry_new (geom->dev, geom->start, geom->length);
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}
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return NULL;
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}
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static PedFileSystemOps btrfs_ops = {
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probe: btrfs_probe,
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};
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static PedFileSystemType btrfs_type = {
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next: NULL,
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ops: &btrfs_ops,
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name: "btrfs",
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};
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void
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ped_file_system_btrfs_init ()
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{
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ped_file_system_type_register (&btrfs_type);
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}
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void
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ped_file_system_btrfs_done ()
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{
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ped_file_system_type_unregister (&btrfs_type);
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}
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