pmt: initial 3.0.2 update

jni/parted/libparted/fs/btrfs/btrfs.c

@@ -0,0 +1,77 @@
+/*
+    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);
+}