[PATCH 2/2] f2fs: fix incorrect range->len in f2fs_trim_fs()

[Chao Yu <chao@kernel.org>]

From: Chao Yu <yuchao0@huawei.com>

generic/260 reported below error:

     [+] Default length with start set (should succeed)
     [+] Length beyond the end of fs (should succeed)
     [+] Length beyond the end of fs with start set (should succeed)
    +./tests/generic/260: line 94: [: 18446744073709551615: integer expression expected
    +./tests/generic/260: line 104: [: 18446744073709551615: integer expression expected
     Test done
    ...

In f2fs_trim_fs(), if there is no discard being trimmed, we need to correct
range->len before return.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
 fs/f2fs/segment.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 24b7147456e9..7b470a1fe92b 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2626,8 +2626,9 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
 
 	trimmed += __wait_discard_cmd_range(sbi, &dpolicy,
 					start_block, end_block);
-	range->len = F2FS_BLK_TO_BYTES(trimmed);
 out:
+	if (!err)
+		range->len = F2FS_BLK_TO_BYTES(trimmed);
 	return err;
 }
 
-- 
2.18.0


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