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Commit 8a6aa325 authored by Fan Li's avatar Fan Li Committed by Jaegeuk Kim
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f2fs: adjust the way of calculating nat block 



use a slightly simpler expression to calculate nat block with nid.

Signed-off-by: default avatarFan Li <fanofcode.li@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 14b44d23

fs/f2fs/node.h

+6 −3
Original line number Diff line number Diff line
@@ -200,13 +200,16 @@ static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start) 
	struct f2fs_nm_info *nm_i = NM_I(sbi);

	pgoff_t block_off;

	pgoff_t block_addr;

	int seg_off;



	/*

	 * block_off = segment_off * 512 + off_in_segment

	 * OLD = (segment_off * 512) * 2 + off_in_segment

	 * NEW = 2 * (segment_off * 512 + off_in_segment) - off_in_segment

	 */

	block_off = NAT_BLOCK_OFFSET(start);

	seg_off = block_off >> sbi->log_blocks_per_seg;



	block_addr = (pgoff_t)(nm_i->nat_blkaddr +

		(seg_off << sbi->log_blocks_per_seg << 1) +

		(block_off << 1) -

		(block_off & (sbi->blocks_per_seg - 1)));



	if (f2fs_test_bit(block_off, nm_i->nat_bitmap))