From 8a6aa32502549b1f15f0a28e3d2fcc5edabc3f19 Mon Sep 17 00:00:00 2001 From: Fan Li Date: Wed, 8 Mar 2017 13:39:16 +0800 Subject: f2fs: adjust the way of calculating nat block use a slightly simpler expression to calculate nat block with nid. Signed-off-by: Fan Li Signed-off-by: Jaegeuk Kim --- fs/f2fs/node.h | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'fs/f2fs/node.h') diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h index 2f9603fa85a5..ebed0240aa53 100644 --- a/fs/f2fs/node.h +++ b/fs/f2fs/node.h @@ -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)) -- cgit v1.2.3