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f2fs: adjust the way of calculating nat block

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

Signed-off-by: Fan Li <fanofcode.li@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Fan Li 2017-03-08 13:39:16 +08:00 committed by Jaegeuk Kim
parent 14b44d238c
commit 8a6aa32502
1 changed files with 6 additions and 3 deletions
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9
fs/f2fs/node.h
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@ -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))