f2fs: support large sector size

Block size in f2fs is 4096 bytes, so theoretically, f2fs can support 4096 bytes
sector device at maximum. But now f2fs only support 512 bytes size sector, so
block device such as zRAM which uses page cache as its block storage space will
not be mounted successfully as mismatch between sector size of zRAM and sector
size of f2fs supported.

In this patch we support large sector size in f2fs, so block device with sector
size of 512/1024/2048/4096 bytes can be supported in f2fs.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -85,7 +85,7 @@ static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
 	bio = bio_alloc(GFP_NOIO, npages);
 
 	bio->bi_bdev = sbi->sb->s_bdev;
-	bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
+	bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
 	bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
 	bio->bi_private = sbi;
 

fs/f2fs/segment.c

@@ -370,8 +370,8 @@ static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
 static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
 				block_t blkstart, block_t blklen)
 {
-	sector_t start = SECTOR_FROM_BLOCK(sbi, blkstart);
-	sector_t len = SECTOR_FROM_BLOCK(sbi, blklen);
+	sector_t start = SECTOR_FROM_BLOCK(blkstart);
+	sector_t len = SECTOR_FROM_BLOCK(blklen);
 	trace_f2fs_issue_discard(sbi->sb, blkstart, blklen);
 	return blkdev_issue_discard(sbi->sb->s_bdev, start, len, GFP_NOFS, 0);
 }

fs/f2fs/segment.h

@@ -89,10 +89,10 @@
 #define TOTAL_SECS(sbi)	(sbi->total_sections)
 #define TOTAL_BLKS(sbi)	(SM_I(sbi)->segment_count << sbi->log_blocks_per_seg)
 
-#define SECTOR_FROM_BLOCK(sbi, blk_addr)				\
-	(((sector_t)blk_addr) << (sbi)->log_sectors_per_block)
-#define SECTOR_TO_BLOCK(sbi, sectors)					\
-	(sectors >> (sbi)->log_sectors_per_block)
+#define SECTOR_FROM_BLOCK(blk_addr)					\
+	(((sector_t)blk_addr) << F2FS_LOG_SECTORS_PER_BLOCK)
+#define SECTOR_TO_BLOCK(sectors)					\
+	(sectors >> F2FS_LOG_SECTORS_PER_BLOCK)
 #define MAX_BIO_BLOCKS(sbi)						\
 	((int)min((int)max_hw_blocks(sbi), BIO_MAX_PAGES))
 
@@ -711,7 +711,7 @@ static inline unsigned int max_hw_blocks(struct f2fs_sb_info *sbi)
 {
 	struct block_device *bdev = sbi->sb->s_bdev;
 	struct request_queue *q = bdev_get_queue(bdev);
-	return SECTOR_TO_BLOCK(sbi, queue_max_sectors(q));
+	return SECTOR_TO_BLOCK(queue_max_sectors(q));
 }
 
 /*

fs/f2fs/super.c

@@ -788,14 +788,22 @@ static int sanity_check_raw_super(struct super_block *sb,
 		return 1;
 	}
 
-	if (le32_to_cpu(raw_super->log_sectorsize) !=
-					F2FS_LOG_SECTOR_SIZE) {
-		f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
+	/* Currently, support 512/1024/2048/4096 bytes sector size */
+	if (le32_to_cpu(raw_super->log_sectorsize) >
+				F2FS_MAX_LOG_SECTOR_SIZE ||
+		le32_to_cpu(raw_super->log_sectorsize) <
+				F2FS_MIN_LOG_SECTOR_SIZE) {
+		f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
+			le32_to_cpu(raw_super->log_sectorsize));
 		return 1;
 	}
-	if (le32_to_cpu(raw_super->log_sectors_per_block) !=
-					F2FS_LOG_SECTORS_PER_BLOCK) {
-		f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
+	if (le32_to_cpu(raw_super->log_sectors_per_block) +
+		le32_to_cpu(raw_super->log_sectorsize) !=
+			F2FS_MAX_LOG_SECTOR_SIZE) {
+		f2fs_msg(sb, KERN_INFO,
+			"Invalid log sectors per block(%u) log sectorsize(%u)",
+			le32_to_cpu(raw_super->log_sectors_per_block),
+			le32_to_cpu(raw_super->log_sectorsize));
 		return 1;
 	}
 	return 0;

include/linux/f2fs_fs.h

@@ -15,8 +15,9 @@
 #include <linux/types.h>
 
 #define F2FS_SUPER_OFFSET		1024	/* byte-size offset */
-#define F2FS_LOG_SECTOR_SIZE		9	/* 9 bits for 512 byte */
-#define F2FS_LOG_SECTORS_PER_BLOCK	3	/* 4KB: F2FS_BLKSIZE */
+#define F2FS_MIN_LOG_SECTOR_SIZE	9	/* 9 bits for 512 bytes */
+#define F2FS_MAX_LOG_SECTOR_SIZE	12	/* 12 bits for 4096 bytes */
+#define F2FS_LOG_SECTORS_PER_BLOCK	3	/* log number for sector/blk */
 #define F2FS_BLKSIZE			4096	/* support only 4KB block */
 #define F2FS_MAX_EXTENSION		64	/* # of extension entries */
 #define F2FS_BLK_ALIGN(x)	(((x) + F2FS_BLKSIZE - 1) / F2FS_BLKSIZE)