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Subject[PATCH 4/5] f2fs: disable small discard in lfs mode
Date
In lfs mode, it is better to send the discard of the overall section
each time to avoid missing alignment with flash.

Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
---
fs/f2fs/segment.c | 3 ++-
fs/f2fs/sysfs.c | 4 ++++
2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index fd38b61..f6c20e0 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1766,7 +1766,8 @@ static int create_discard_cmd_control(struct f2fs_sb_info *sbi)
atomic_set(&dcc->issing_discard, 0);
atomic_set(&dcc->discard_cmd_cnt, 0);
dcc->nr_discards = 0;
- dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
+ dcc->max_discards = test_opt(sbi, LFS) ? 0 :
+ MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
dcc->undiscard_blks = 0;
dcc->root = RB_ROOT;
dcc->rbtree_check = false;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 2e7e611..4b6c457 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -271,6 +271,10 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
return count;
}

+ if (!strcmp(a->attr.name, "max_small_discards") &&
+ test_opt(sbi, LFS))
+ return -EINVAL;
+
*ui = t;

if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
--
1.8.5.2
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