[f2fs-dev] [PATCH v3 7/7] f2fs-tools: Support different block sizes

[Daniel Rosenberg via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

This adds support for 4K and 16K block size using the same binary.
mkfs can choose block size via the -b option, with other tools getting
the blocksize from the superblock.

On mount time, we can't rely on block size for the location for the
superblock, since that information is in the superblock. If the first
superblock is corrupt, we will attempt to find the second superblock at
a 4K block offset, and then a 16K block offset if that fails.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
---
 fsck/fsck.h             |  3 ---
 fsck/mount.c            | 25 ++++++++++++++++++++-----
 include/f2fs_fs.h       | 10 +++++++---
 lib/libf2fs.c           |  2 ++
 mkfs/f2fs_format_main.c | 12 +++++++++++-
 5 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/fsck/fsck.h b/fsck/fsck.h
index 89d0b22..091b5d8 100644
--- a/fsck/fsck.h
+++ b/fsck/fsck.h
@@ -127,9 +127,6 @@ struct f2fs_fsck {
 };
 
 #define BLOCK_SZ		F2FS_BLKSIZE
-struct block {
-	unsigned char buf[BLOCK_SZ];
-};
 
 enum NODE_TYPE {
 	TYPE_INODE = 37,
diff --git a/fsck/mount.c b/fsck/mount.c
index 93373c6..e0a062b 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -994,11 +994,15 @@ int sanity_check_raw_super(struct f2fs_super_block *sb, enum SB_ADDR sb_addr)
 		return -1;
 
 	blocksize = 1 << get_sb(log_blocksize);
-	if (F2FS_BLKSIZE != blocksize) {
-		MSG(0, "Invalid blocksize (%u), supports only (%u)\n",
-			blocksize, F2FS_BLKSIZE);
+	if (blocksize < F2FS_MIN_BLKSIZE || blocksize > F2FS_MAX_BLKSIZE) {
+		MSG(0, "Invalid blocksize (%u), must be between 4KB and 16KB\n",
+			blocksize);
 		return -1;
 	}
+	c.blksize_bits = get_sb(log_blocksize);
+	c.blksize = blocksize;
+	c.sectors_per_blk = F2FS_BLKSIZE / c.sector_size;
+	check_block_struct_sizes();
 
 	/* check log blocks per segment */
 	if (get_sb(log_blocks_per_seg) != 9) {
@@ -3854,9 +3858,20 @@ int f2fs_do_mount(struct f2fs_sb_info *sbi)
 	sbi->active_logs = NR_CURSEG_TYPE;
 	ret = validate_super_block(sbi, SB0_ADDR);
 	if (ret) {
+		/* Assuming 4K Block Size */
+		c.blksize_bits = 12;
+		c.blksize = 1 << c.blksize_bits;
+		MSG(0, "Looking for secondary superblock assuming 4K Block Size\n");
 		ret = validate_super_block(sbi, SB1_ADDR);
-		if (ret)
-			return -1;
+		if (ret) {
+			/* Trying 16K Block Size */
+			c.blksize_bits = 14;
+			c.blksize = 1 << c.blksize_bits;
+			MSG(0, "Looking for secondary superblock assuming 16K Block Size\n");
+			ret = validate_super_block(sbi, SB1_ADDR);
+			if (ret)
+				return -1;
+		}
 	}
 	sb = F2FS_RAW_SUPER(sbi);
 
diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index edc2eaf..35eedc6 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -392,7 +392,7 @@ static inline uint64_t bswap_64(uint64_t val)
 #define MAX_DEVICES		8
 
 #define F2FS_BYTES_TO_BLK(bytes)    ((bytes) >> F2FS_BLKSIZE_BITS)
-#define F2FS_BLKSIZE_BITS 12	/* 4KB block */
+#define F2FS_BLKSIZE_BITS c.blksize_bits
 
 /* for mkfs */
 #define	F2FS_NUMBER_OF_CHECKPOINT_PACK	2
@@ -400,6 +400,7 @@ static inline uint64_t bswap_64(uint64_t val)
 #define	DEFAULT_SECTORS_PER_BLOCK	(1 << (F2FS_BLKSIZE_BITS - SECTOR_SHIFT))
 #define	DEFAULT_BLOCKS_PER_SEGMENT	512
 #define DEFAULT_SEGMENTS_PER_SECTION	1
+#define DEFAULT_BLKSIZE_BITS		12	/* 4096	*/
 
 #define VERSION_LEN		256
 #define VERSION_TIMESTAMP_LEN	4
@@ -628,9 +629,10 @@ enum {
  */
 #define F2FS_SUPER_OFFSET		1024	/* byte-size offset */
 #define F2FS_MIN_LOG_SECTOR_SIZE	9	/* 9 bits for 512 bytes */
-#define F2FS_MAX_LOG_SECTOR_SIZE	F2FS_BLKSIZE_BITS	/* 12 bits for 4096 bytes */
-#define F2FS_BLKSIZE			(1 << F2FS_BLKSIZE_BITS)/* support only 4KB block */
+#define F2FS_MAX_LOG_SECTOR_SIZE	F2FS_BLKSIZE_BITS	/* max sector size is block size */
+#define F2FS_MIN_BLKSIZE		4096
 #define F2FS_MAX_BLKSIZE		16384
+#define F2FS_BLKSIZE			c.blksize	/* support configurable block size */
 #define F2FS_MAX_EXTENSION		64	/* # of extension entries */
 #define F2FS_EXTENSION_LEN		8	/* max size of extension */
 #define F2FS_BLK_ALIGN(x)	(((x) + F2FS_BLKSIZE - 1) / F2FS_BLKSIZE)
@@ -1510,6 +1512,8 @@ struct f2fs_configuration {
 	uint32_t lpf_ino;
 	uint32_t root_uid;
 	uint32_t root_gid;
+	uint32_t blksize;
+	uint32_t blksize_bits;
 
 	/* defragmentation parameters */
 	int defrag_shrink;
diff --git a/lib/libf2fs.c b/lib/libf2fs.c
index 8f2cc3b..995e42d 100644
--- a/lib/libf2fs.c
+++ b/lib/libf2fs.c
@@ -686,6 +686,8 @@ void f2fs_init_configuration(void)
 
 	memset(&c, 0, sizeof(struct f2fs_configuration));
 	c.ndevs = 1;
+	c.blksize = 1 << DEFAULT_BLKSIZE_BITS;
+	c.blksize_bits = DEFAULT_BLKSIZE_BITS;
 	c.sectors_per_blk = DEFAULT_SECTORS_PER_BLOCK;
 	c.blks_per_seg = DEFAULT_BLOCKS_PER_SEGMENT;
 	c.wanted_total_sectors = -1;
diff --git a/mkfs/f2fs_format_main.c b/mkfs/f2fs_format_main.c
index 3a4b18c..4de517a 100644
--- a/mkfs/f2fs_format_main.c
+++ b/mkfs/f2fs_format_main.c
@@ -50,6 +50,7 @@ static void mkfs_usage()
 	MSG(0, "\nUsage: mkfs.f2fs [options] device [sectors]\n");
 	MSG(0, "[options]:\n");
 	MSG(0, "  -a heap-based allocation [default:0]\n");
+	MSG(0, "  -b filesystem block size [default:4096]\n");
 	MSG(0, "  -c device1[,device2,...] up to 7 additional devices, except meta device\n");
 	MSG(0, "  -d debug level [default:0]\n");
 	MSG(0, "  -e [cold file ext list] e.g. \"mp3,gif,mov\"\n");
@@ -175,7 +176,7 @@ static void add_default_options(void)
 
 static void f2fs_parse_options(int argc, char *argv[])
 {
-	static const char *option_string = "qa:c:C:d:e:E:g:hil:mo:O:rR:s:S:z:t:T:U:Vfw:Z:";
+	static const char *option_string = "qa:b:c:C:d:e:E:g:hil:mo:O:rR:s:S:z:t:T:U:Vfw:Z:";
 	static const struct option long_opts[] = {
 		{ .name = "help", .has_arg = 0, .flag = NULL, .val = 'h' },
 		{ .name = NULL, .has_arg = 0, .flag = NULL, .val = 0 }
@@ -192,6 +193,15 @@ static void f2fs_parse_options(int argc, char *argv[])
 		case 'a':
 			c.heap = atoi(optarg);
 			break;
+		case 'b':
+			c.blksize = atoi(optarg);
+			c.blksize_bits = log_base_2(c.blksize);
+			c.sectors_per_blk = DEFAULT_SECTORS_PER_BLOCK;
+			if ((1 << c.blksize_bits) != c.blksize) {
+				MSG(0, "Error: Block size must be power of 2");
+				mkfs_usage();
+			}
+			break;
 		case 'c':
 			if (c.ndevs >= MAX_DEVICES) {
 				MSG(0, "Error: Too many devices\n");
-- 
2.42.0.rc2.253.gd59a3bf2b4-goog



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