On 12/17, gaoxiang (P) wrote:
> clean up some redundant repeat code in build_sit_entries
> and seperate some logic into new functions:
> - build_discard_entries
> - build_sec_entries
This patch makes another big loop redundantly?
>
> Note that "if (f2fs_discard_en(sbi))" and "if (sbi->segs_per_sec > 1)"
> are all taken out of the loops they are unchangable.
>
> Signed-off-by: Gao Xiang <gaoxian...@huawei.com>
> ---
> fs/f2fs/segment.c | 80
> +++++++++++++++++++++++++------------------------------
> 1 file changed, 37 insertions(+), 43 deletions(-)
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 40e1d20..bcd8a40 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -3476,12 +3476,39 @@ static int build_curseg(struct f2fs_sb_info *sbi)
> return restore_curseg_summaries(sbi);
> }
>
> +static void build_discard_entries(struct f2fs_sb_info *sbi)
> +{
> + unsigned segno;
> +
> + for (segno = 0; segno < MAIN_SEGS(sbi); ++segno) {
> + struct seg_entry *se = get_seg_entry(sbi, segno);
> +
> + if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG))
> + memset(se->discard_map, 0xff, SIT_VBLOCK_MAP_SIZE);
> + else {
> + memcpy(se->discard_map, se->cur_valid_map,
> + SIT_VBLOCK_MAP_SIZE);
> +
> + sbi->discard_blks += sbi->blocks_per_seg -
> + se->valid_blocks;
> + }
> + }
> +}
> +
> +static void build_sec_entries(struct f2fs_sb_info *sbi)
> +{
> + unsigned segno;
> +
> + for (segno = 0; segno < MAIN_SEGS(sbi); ++segno)
> + get_sec_entry(sbi, segno)->valid_blocks +=
> + get_seg_entry(sbi, segno)->valid_blocks;
> +}
> +
> static void build_sit_entries(struct f2fs_sb_info *sbi)
> {
> struct sit_info *sit_i = SIT_I(sbi);
> struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
> struct f2fs_journal *journal = curseg->journal;
> - struct seg_entry *se;
> struct f2fs_sit_entry sit;
> int sit_blk_cnt = SIT_BLK_CNT(sbi);
> unsigned int i, start, end;
> @@ -3498,67 +3525,34 @@ static void build_sit_entries(struct f2fs_sb_info
> *sbi)
> struct f2fs_sit_block *sit_blk;
> struct page *page;
>
> - se = &sit_i->sentries[start];
> page = get_current_sit_page(sbi, start);
> sit_blk = (struct f2fs_sit_block *)page_address(page);
> sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
> f2fs_put_page(page, 1);
>
> check_block_count(sbi, start, &sit);
> - seg_info_from_raw_sit(se, &sit);
> -
> - /* build discard map only one time */
> - if (f2fs_discard_en(sbi)) {
> - if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
> - memset(se->discard_map, 0xff,
> - SIT_VBLOCK_MAP_SIZE);
> - } else {
> - memcpy(se->discard_map,
> - se->cur_valid_map,
> - SIT_VBLOCK_MAP_SIZE);
> - sbi->discard_blks +=
> - sbi->blocks_per_seg -
> - se->valid_blocks;
> - }
> - }
>
> - if (sbi->segs_per_sec > 1)
> - get_sec_entry(sbi, start)->valid_blocks +=
> - se->valid_blocks;
> + seg_info_from_raw_sit(&sit_i->sentries[start], &sit);
> }
> start_blk += readed;
> } while (start_blk < sit_blk_cnt);
>
> down_read(&curseg->journal_rwsem);
> for (i = 0; i < sits_in_cursum(journal); i++) {
> - unsigned int old_valid_blocks;
> -
> start = le32_to_cpu(segno_in_journal(journal, i));
> - se = &sit_i->sentries[start];
> sit = sit_in_journal(journal, i);
>
> - old_valid_blocks = se->valid_blocks;
> -
> check_block_count(sbi, start, &sit);
> - seg_info_from_raw_sit(se, &sit);
> -
> - if (f2fs_discard_en(sbi)) {
> - if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
> - memset(se->discard_map, 0xff,
> - SIT_VBLOCK_MAP_SIZE);
> - } else {
> - memcpy(se->discard_map, se->cur_valid_map,
> - SIT_VBLOCK_MAP_SIZE);
> - sbi->discard_blks += old_valid_blocks -
> - se->valid_blocks;
> - }
> - }
> -
> - if (sbi->segs_per_sec > 1)
> - get_sec_entry(sbi, start)->valid_blocks +=
> - se->valid_blocks - old_valid_blocks;
> + seg_info_from_raw_sit(&sit_i->sentries[start], &sit);
> }
> up_read(&curseg->journal_rwsem);
> +
> + /* build discard map only one time */
> + if (f2fs_discard_en(sbi))
> + build_discard_entries(sbi);
> +
> + if (sbi->segs_per_sec > 1)
> + build_sec_entries(sbi);
> }
>
> static void init_free_segmap(struct f2fs_sb_info *sbi)
> --
> 2.1.4
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