Commit ad6672bb authored Jul 19, 2018 by Yunlong Song Committed by Jaegeuk Kim Aug 01, 2018

f2fs: issue discard align to section in LFS mode



For the case when sbi->segs_per_sec > 1 with lfs mode, take
section:segment = 5 for example, if the section prefree_map is
...previous section | current section (1 1 0 1 1) | next section...,
then the start = x, end = x + 1, after start = start_segno +
sbi->segs_per_sec, start = x + 5, then it will skip x + 3 and x + 4, but
their bitmap is still set, which will cause duplicated
f2fs_issue_discard of this same section in the next write_checkpoint:

round 1: section bitmap : 1 1 1 1 1, all valid, prefree_map: 0 0 0 0 0
then rm data block NO.2, block NO.2 becomes invalid, prefree_map: 0 0 1 0 0
write_checkpoint: section bitmap: 1 1 0 1 1, prefree_map: 0 0 0 0 0,
prefree of NO.2 is cleared, and no discard issued

round 2: rm data block NO.0, NO.1, NO.3, NO.4
all invalid, but prefree bit of NO.2 is set and cleared in round 1, then
prefree_map: 1 1 0 1 1
write_checkpoint: section bitmap: 0 0 0 0 0, prefree_map: 0 0 0 1 1, no
valid blocks of this section, so discard issued, but this time prefree
bit of NO.3 and NO.4 is skipped due to start = start_segno + sbi->segs_per_sec;

round 3:
write_checkpoint: section bitmap: 0 0 0 0 0, prefree_map: 0 0 0 1 1 ->
0 0 0 0 0, no valid blocks of this section, so discard issued,
this time prefree bit of NO.3 and NO.4 is cleared, but the discard of
this section is sent again...

To fix this problem, we can align the start and end value to section
boundary for fstrim and real-time discard operation, and decide to issue
discard only when the whole section is invalid, which can issue discard
aligned to section size as much as possible and avoid redundant discard.

Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 455e3a58

fs/f2fs/segment.c

+17 −3

Original line number	Diff line number	Diff line
		@@ -1715,21 +1715,30 @@ void f2fs_clear_prefree_segments(struct f2fs_sb_info *sbi,
		unsigned int start = 0, end = -1;
		unsigned int secno, start_segno;
		bool force = (cpc->reason & CP_DISCARD);
		bool need_align = test_opt(sbi, LFS) && sbi->segs_per_sec > 1;

		mutex_lock(&dirty_i->seglist_lock);

		while (1) {
		int i;

		if (need_align && end != -1)
		end--;
		start = find_next_bit(prefree_map, MAIN_SEGS(sbi), end + 1);
		if (start >= MAIN_SEGS(sbi))
		break;
		end = find_next_zero_bit(prefree_map, MAIN_SEGS(sbi),
		start + 1);

		for (i = start; i < end; i++)
		clear_bit(i, prefree_map);
		if (need_align) {
		start = rounddown(start, sbi->segs_per_sec);
		end = roundup(end, sbi->segs_per_sec);
		}

		dirty_i->nr_dirty[PRE] -= end - start;
		for (i = start; i < end; i++) {
		if (test_and_clear_bit(i, prefree_map))
		dirty_i->nr_dirty[PRE]--;
		}

		if (!test_opt(sbi, DISCARD))
		continue;
		@@ -2516,6 +2525,7 @@ int f2fs_trim_fs(struct f2fs_sb_info sbi, struct fstrim_range range)
		struct discard_policy dpolicy;
		unsigned long long trimmed = 0;
		int err = 0;
		bool need_align = test_opt(sbi, LFS) && sbi->segs_per_sec > 1;

		if (start >= MAX_BLKADDR(sbi) \|\| range->len < sbi->blocksize)
		return -EINVAL;
		@@ -2533,6 +2543,10 @@ int f2fs_trim_fs(struct f2fs_sb_info sbi, struct fstrim_range range)
		start_segno = (start <= MAIN_BLKADDR(sbi)) ? 0 : GET_SEGNO(sbi, start);
		end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
		GET_SEGNO(sbi, end);
		if (need_align) {
		start_segno = rounddown(start_segno, sbi->segs_per_sec);
		end_segno = roundup(end_segno + 1, sbi->segs_per_sec) - 1;
		}

		cpc.reason = CP_DISCARD;
		cpc.trim_minlen = max_t(__u64, 1, F2FS_BYTES_TO_BLK(range->minlen));

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