f2fs: bug fix on bit overflow from 32bits to 64bits

This patch fixes some bit overflows by the shift operations.

Dan Carpenter reported potential bugs on bit overflows as follows.

fs/f2fs/segment.c:910 submit_write_page()
	warn: should 'blk_addr << ((sbi)->log_blocksize - 9)' be a 64 bit type?
fs/f2fs/checkpoint.c:429 get_valid_checkpoint()
	warn: should '1 << ()' be a 64 bit type?
fs/f2fs/data.c:408 f2fs_readpage()
	warn: should 'blk_addr << ((sbi)->log_blocksize - 9)' be a 64 bit type?
fs/f2fs/data.c:457 submit_read_page()
	warn: should 'blk_addr << ((sbi)->log_blocksize - 9)' be a 64 bit type?
fs/f2fs/data.c:525 get_data_block_ro()
	warn: should 'i << blkbits' be a 64 bit type?

Bug-Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

fs/f2fs/checkpoint.c

@@ -426,7 +426,8 @@ int get_valid_checkpoint(struct f2fs_sb_info *sbi)
 	cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 
 	/* The second checkpoint pack should start at the next segment */
-	cp_start_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
+	cp_start_blk_no += ((unsigned long long)1) <<
+				le32_to_cpu(fsb->log_blocks_per_seg);
 	cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 
 	if (cp1 && cp2) {

fs/f2fs/data.c

@@ -525,7 +525,7 @@ static int get_data_block_ro(struct inode *inode, sector_t iblock,
 				!= (dn.data_blkaddr + i)) || maxblocks == i)
 				break;
 		map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
-		bh_result->b_size = (i << blkbits);
+		bh_result->b_size = (((size_t)i) << blkbits);
 	}
 	f2fs_put_dnode(&dn);
 	trace_f2fs_get_data_block(inode, iblock, bh_result, 0);

fs/f2fs/segment.c

@@ -270,8 +270,8 @@ static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
 static void f2fs_issue_discard(struct f2fs_sb_info *sbi,
 				block_t blkstart, block_t blklen)
 {
-	sector_t start = ((sector_t)blkstart) << sbi->log_sectors_per_block;
-	sector_t len = ((sector_t)blklen) << sbi->log_sectors_per_block;
+	sector_t start = SECTOR_FROM_BLOCK(sbi, blkstart);
+	sector_t len = SECTOR_FROM_BLOCK(sbi, blklen);
 	blkdev_issue_discard(sbi->sb->s_bdev, start, len, GFP_NOFS, 0);
 	trace_f2fs_issue_discard(sbi->sb, blkstart, blklen);
 }

fs/f2fs/segment.h

@@ -86,9 +86,9 @@
 #define TOTAL_SECS(sbi)	(sbi->total_sections)
 
 #define SECTOR_FROM_BLOCK(sbi, blk_addr)				\
-	(blk_addr << ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))
+	(((sector_t)blk_addr) << (sbi)->log_sectors_per_block)
 #define SECTOR_TO_BLOCK(sbi, sectors)					\
-	(sectors >> ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))
+	(sectors >> (sbi)->log_sectors_per_block)
 #define MAX_BIO_BLOCKS(max_hw_blocks)					\
 	(min((int)max_hw_blocks, BIO_MAX_PAGES))