Commit e81c93cf authored by Changman Lee's avatar Changman Lee Committed by Jaegeuk Kim

f2fs: improve searching speed of __next_free_blkoff

To find a zero bit using the result of OR operation between ckpt_valid_map
and cur_valid_map is more fast than find a zero bit in each bitmap.
Signed-off-by: default avatarChangman Lee <cm224.lee@samsung.com>
[Jaegeuk Kim: adjust changed function name]
Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 9a7f143a
......@@ -607,13 +607,18 @@ static void __next_free_blkoff(struct f2fs_sb_info *sbi,
struct curseg_info *seg, block_t start)
{
struct seg_entry *se = get_seg_entry(sbi, seg->segno);
block_t ofs;
for (ofs = start; ofs < sbi->blocks_per_seg; ofs++) {
if (!f2fs_test_bit(ofs, se->ckpt_valid_map)
&& !f2fs_test_bit(ofs, se->cur_valid_map))
break;
}
seg->next_blkoff = ofs;
int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
unsigned long target_map[entries];
unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
int i, pos;
for (i = 0; i < entries; i++)
target_map[i] = ckpt_map[i] | cur_map[i];
pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
seg->next_blkoff = pos;
}
/*
......
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