On 2018/7/16 18:03, Yunlong Song wrote:
> 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, so
> fix it.
I mean:
Subject: [PATCH] f2fs: issue discard align to section in LFS mode
---
fs/f2fs/segment.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index f12dad627fb4..6640c790cf64 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1761,6 +1761,7 @@ 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);
@@ -1772,10 +1773,15 @@ void f2fs_clear_prefree_segments(struct f2fs_sb_info
*sbi,
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(start, 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;
@@ -2564,6 +2570,7 @@ 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;
@@ -2582,6 +2589,12 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct
fstrim_range *range)
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, sbi->segs_per_sec);
+ end_segno = min(end_segno, MAIN_SEGS(sbi) - 1);
+ }
+
cpc.reason = CP_DISCARD;
cpc.trim_minlen = max_t(__u64, 1, F2FS_BYTES_TO_BLK(range->minlen));
cpc.trim_start = start_segno;
--
2.18.0.rc1
>
> Signed-off-by: Yunlong Song <yunlong.s...@huawei.com>
> ---
> fs/f2fs/segment.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index cfff7cf..5dc1d5cc 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -1729,6 +1729,15 @@ void f2fs_clear_prefree_segments(struct f2fs_sb_info
> *sbi,
> if (!test_opt(sbi, DISCARD))
> continue;
>
> + if (test_opt(sbi, LFS) && sbi->segs_per_sec > 1) {
> + start = rounddown(start, sbi->segs_per_sec);
> + i = end;
> + end = roundup(end, sbi->segs_per_sec);
> + while (++i < end)
> + if (test_and_clear_bit(i, prefree_map))
> + dirty_i->nr_dirty[PRE]--;
> + }
> +
> if (force && start >= cpc->trim_start &&
> (end - 1) <= cpc->trim_end)
> continue;
>
