volume_id: add f2fs detection

function                                             old     new   delta
volume_id_probe_f2fs                                   -      98     +98

Signed-off-by: Sven-Göran Bergh <sgb@systemasis.org>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 100 insertions, 0 deletions

diff --git a/util-linux/volume_id/f2fs.c b/util-linux/volume_id/f2fs.c
new file mode 100644
index 000000000..bf0b66278
--- /dev/null
+++ b/util-linux/volume_id/f2fs.c
@@ -0,0 +1,95 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2012 S-G Bergh <sgb@systemasis.org>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_F2FS) += f2fs.o
+
+//config:
+//config:config FEATURE_VOLUMEID_F2FS
+//config:	bool "f2fs filesystem"
+//config:	default y
+//config:	depends on VOLUMEID
+//config:	help
+//config:	  F2FS (aka Flash-Friendly File System) is a log-structured file system,
+//config:	  which is adapted to newer forms of storage. F2FS also remedies some
+//config:	  known issues of the older log structured file systems, such as high
+//config:	  cleaning overhead.
+//config:
+
+#include "volume_id_internal.h"
+
+#define F2FS_MAGIC		0xF2F52010	// F2FS Magic Number
+#define F2FS_UUID_SIZE		16
+#define F2FS_LABEL_SIZE		512
+#define F2FS_LABEL_BYTES	1024
+#define F2FS_SB1_OFFSET		0x400		// offset for 1:st super block
+/*
+#define F2FS_SB2_OFFSET		0x1400		// offset for 2:nd super block
+*/
+
+struct f2fs_super_block {	// According to version 1.1
+/* 0x00 */	uint32_t	magic;			// Magic Number
+/* 0x04 */	uint16_t	major_ver;		// Major Version
+/* 0x06 */	uint16_t	minor_ver;		// Minor Version
+/* 0x08 */	uint32_t	log_sectorsize;		// log2 sector size in bytes
+/* 0x0C */	uint32_t	log_sectors_per_block;	// log2 # of sectors per block
+/* 0x10 */	uint32_t	log_blocksize;		// log2 block size in bytes
+/* 0x14 */	uint32_t	log_blocks_per_seg;	// log2 # of blocks per segment
+/* 0x18 */	uint32_t	segs_per_sec;		// # of segments per section
+/* 0x1C */	uint32_t	secs_per_zone;		// # of sections per zone
+/* 0x20 */	uint32_t	checksum_offset;	// checksum offset inside super block
+/* 0x24 */	uint64_t	block_count;		// total # of user blocks
+/* 0x2C */	uint32_t	section_count;		// total # of sections
+/* 0x30 */	uint32_t	segment_count;		// total # of segments
+/* 0x34 */	uint32_t	segment_count_ckpt;	// # of segments for checkpoint
+/* 0x38 */	uint32_t	segment_count_sit;	// # of segments for SIT
+/* 0x3C */	uint32_t	segment_count_nat;	// # of segments for NAT
+/* 0x40 */	uint32_t	segment_count_ssa;	// # of segments for SSA
+/* 0x44 */	uint32_t	segment_count_main;	// # of segments for main area
+/* 0x48 */	uint32_t	segment0_blkaddr;	// start block address of segment 0
+/* 0x4C */	uint32_t	cp_blkaddr;		// start block address of checkpoint
+/* 0x50 */	uint32_t	sit_blkaddr;		// start block address of SIT
+/* 0x54 */	uint32_t	nat_blkaddr;		// start block address of NAT
+/* 0x58 */	uint32_t	ssa_blkaddr;		// start block address of SSA
+/* 0x5C */	uint32_t	main_blkaddr;		// start block address of main area
+/* 0x60 */	uint32_t	root_ino;		// root inode number
+/* 0x64 */	uint32_t	node_ino;		// node inode number
+/* 0x68 */	uint32_t	meta_ino;		// meta inode number
+/* 0x6C */	uint8_t		uuid[F2FS_UUID_SIZE];	// 128-bit uuid for volume
+/* 0x7C */	uint16_t	volume_name[F2FS_LABEL_SIZE];	// volume name
+// /* 0x47C */	uint32_t	extension_count;	// # of extensions below
+// /* 0x480 */	uint8_t		extension_list[64][8];	// extension array
+} PACKED;
+
+
+int FAST_FUNC volume_id_probe_f2fs(struct volume_id *id /*,uint64_t off*/)
+{
+	struct f2fs_super_block *sb;
+
+	// Go for primary super block (ignore second sb)
+	dbg("f2fs: probing at offset 0x%x", F2FS_SB1_OFFSET);
+	sb = volume_id_get_buffer(id, F2FS_SB1_OFFSET, sizeof(*sb));
+
+	if (!sb)
+		return -1;
+
+	if (sb->magic != cpu_to_le32(F2FS_MAGIC))
+		return -1;
+
+	IF_FEATURE_BLKID_TYPE(id->type = "f2fs");
+
+	// For version 1.0 we don't know sb structure and can't set label/uuid
+	if (sb->major_ver == cpu_to_le16(1) && sb->minor_ver == cpu_to_le16(0))
+		return 0;
+
+	volume_id_set_label_unicode16(id, (uint8_t *)sb->volume_name,
+				      LE, MIN(F2FS_LABEL_BYTES, VOLUME_ID_LABEL_SIZE));
+
+	volume_id_set_uuid(id, sb->uuid, UUID_DCE);
+
+	return 0;
+}
diff --git a/util-linux/volume_id/volume_id.c b/util-linux/volume_id/volume_id.c
index 097a6f1ee..5c459a0e2 100644
--- a/util-linux/volume_id/volume_id.c
+++ b/util-linux/volume_id/volume_id.c
@@ -138,6 +138,9 @@ static const probe_fptr fs2[] = {
 #if ENABLE_FEATURE_VOLUMEID_UFS
 	volume_id_probe_ufs,
 #endif
+#if ENABLE_FEATURE_VOLUMEID_F2FS
+	volume_id_probe_f2fs,
+#endif
 #if ENABLE_FEATURE_VOLUMEID_NILFS
 	volume_id_probe_nilfs,
 #endif
diff --git a/util-linux/volume_id/volume_id_internal.h b/util-linux/volume_id/volume_id_internal.h
index d3c6a6101..6e2dbd7bb 100644
--- a/util-linux/volume_id/volume_id_internal.h
+++ b/util-linux/volume_id/volume_id_internal.h
@@ -195,6 +195,8 @@ int FAST_FUNC volume_id_probe_luks(struct volume_id *id /*,uint64_t off*/);
 
 //int FAST_FUNC volume_id_probe_msdos_part_table(struct volume_id *id /*,uint64_t off*/);
 
+int FAST_FUNC volume_id_probe_f2fs(struct volume_id *id /*,uint64_t off*/);
+
 int FAST_FUNC volume_id_probe_nilfs(struct volume_id *id /*,uint64_t off*/);
 
 int FAST_FUNC volume_id_probe_ntfs(struct volume_id *id /*,uint64_t off*/);