pmt: initial 3.0.2 update

jni/parted/libparted/fs/nilfs2/nilfs2.c

@@ -0,0 +1,155 @@
+/*
+ *  nilfs2.c - New Implementation of Log filesystem
+ *
+ *  Written by  Jiro SEKIBA <jir@unicus.jp>
+ *
+ *  Copyright (C) 2011-2014, 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/crc32.h>
+#include <parted/endian.h>
+
+/* Magic value for nilfs2 superblock. */
+#define	NILFS2_SUPER_MAGIC		0x3434
+
+/* primariy superblock offset in 512bytes blocks. */
+#define NILFS_SB_OFFSET			2
+
+/* secondary superblock offset in 512byte blocks. */
+#define NILFS_SB2_OFFSET(devsize)	((((devsize)>>3) - 1) << 3)
+
+struct __attribute__ ((packed)) nilfs2_super_block {
+	uint32_t	s_rev_level;
+	uint16_t	s_minor_rev_level;
+	uint16_t	s_magic;
+	uint16_t	s_bytes;
+	uint16_t	s_flags;
+	uint32_t	s_crc_seed;
+	uint32_t	s_sum;
+	uint32_t	s_log_block_size;
+	uint64_t	s_nsegments;
+	uint64_t	s_dev_size;
+	uint64_t	s_first_data_block;
+	uint32_t	s_blocks_per_segment;
+	uint32_t	s_r_segments_percentage;
+	uint64_t	s_last_cno;
+	uint64_t	s_last_pseg;
+	uint64_t	s_last_seq;
+	uint64_t	s_free_blocks_count;
+	uint64_t	s_ctime;
+	uint64_t	s_mtime;
+	uint64_t	s_wtime;
+	uint16_t	s_mnt_count;
+	uint16_t	s_max_mnt_count;
+	uint16_t	s_state;
+	uint16_t	s_errors;
+	uint64_t	s_lastcheck;
+	uint32_t	s_checkinterval;
+	uint32_t	s_creator_os;
+	uint16_t	s_def_resuid;
+	uint16_t	s_def_resgid;
+	uint32_t	s_first_ino;
+	uint16_t	s_inode_size;
+	uint16_t	s_dat_entry_size;
+	uint16_t	s_checkpoint_size;
+	uint16_t	s_segment_usage_size;
+	uint8_t		s_uuid[16];
+	char		s_volume_name[80];
+	uint32_t	s_c_interval;
+	uint32_t	s_c_block_max;
+	uint32_t	s_reserved[192];
+};
+
+static int
+is_valid_nilfs_sb(struct nilfs2_super_block *sb)
+{
+	static unsigned char sum[4];
+	const int sumoff = offsetof (struct nilfs2_super_block, s_sum);
+	size_t bytes;
+	uint32_t crc;
+
+	if (PED_LE16_TO_CPU(sb->s_magic) != NILFS2_SUPER_MAGIC)
+		return 0;
+
+	bytes = PED_LE16_TO_CPU(sb->s_bytes);
+	if (bytes > 1024 || bytes < sumoff - 4)
+		return 0;
+
+	crc = __efi_crc32(sb, sumoff, PED_LE32_TO_CPU(sb->s_crc_seed));
+	crc = __efi_crc32(sum, 4, crc);
+	crc = __efi_crc32((unsigned char *)sb + sumoff + 4,
+			  bytes - sumoff - 4, crc);
+
+	return crc == PED_LE32_TO_CPU(sb->s_sum);
+}
+
+PedGeometry*
+nilfs2_probe (PedGeometry* geom)
+{
+	struct nilfs2_super_block *sb = NULL;
+	struct nilfs2_super_block *sb2 = NULL;
+	PedSector length = geom->length * (geom->dev->sector_size / 512);
+
+	PedSector sb2off = NILFS_SB2_OFFSET(length) / (geom->dev->sector_size / 512);
+	if (sb2off <= 2)
+		return NULL;
+	const int sectors = (4096 + geom->dev->sector_size - 1) /
+			     geom->dev->sector_size;
+	uint8_t *buf = alloca (sectors * geom->dev->sector_size);
+	const int sectors2 = (1024 + geom->dev->sector_size -1 ) /
+			      geom->dev->sector_size;
+	void *buff2 = alloca (sectors2 * geom->dev->sector_size);
+
+	if (ped_geometry_read(geom, buf, 0, sectors))
+		sb = (struct nilfs2_super_block*)(buf + 1024);
+	if (ped_geometry_read(geom, buff2, sb2off, sectors2))
+		sb2 = (struct nilfs2_super_block*)buff2;
+
+	if ((!sb || !is_valid_nilfs_sb(sb)) &&
+	    (!sb2 || !is_valid_nilfs_sb(sb2)))
+		return NULL;
+
+	/* reserve 4k bytes for secondary superblock */
+	length = sb2off + ((4096 + geom->dev->sector_size - 1) /
+			   geom->dev->sector_size);
+
+	return ped_geometry_new(geom->dev, geom->start, length);
+}
+
+static PedFileSystemOps nilfs2_ops = {
+	probe:			nilfs2_probe,
+};
+
+static PedFileSystemType nilfs2_type = {
+	next:   NULL,
+	ops:    &nilfs2_ops,
+	name:   "nilfs2",
+};
+
+void
+ped_file_system_nilfs2_init ()
+{
+	ped_file_system_type_register (&nilfs2_type);
+}
+
+void
+ped_file_system_nilfs2_done ()
+{
+	ped_file_system_type_unregister (&nilfs2_type);
+}