f2fs: fix normal discard process

[ Upstream commit b5f1a218ae5e4339130d6e733f0e63d623e09a2c ]

In the DPOLICY_BG mode, there is a conflict between
the two conditions "i + 1 < dpolicy->granularity" and
"i < DEFAULT_DISCARD_GRANULARITY". If i = 15, the first
condition is false, it will enter the second condition
and dispatch all small granularity discards in function
 __issue_discard_cmd_orderly. The restrictive effect
of the first condition to small discards will be
invalidated. These two conditions should align.

Fixes: 20ee4382322c ("f2fs: issue small discard by LBA order")
Signed-off-by: Dongdong Zhang <zhangdongdong1@oppo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 7a4f7c8..c568821 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1448,7 +1448,7 @@ retry:
                if (i + 1 < dpolicy->granularity)
                        break;
 
-               if (i < DEFAULT_DISCARD_GRANULARITY && dpolicy->ordered)
+               if (i + 1 < DEFAULT_DISCARD_GRANULARITY && dpolicy->ordered)
                        return __issue_discard_cmd_orderly(sbi, dpolicy);
 
                pend_list = &dcc->pend_list[i];