linux-kernel - [PATCH] nilfs2: use 64-bit superblock timstamps

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Date:   Wed, 20 Jun 2018 09:50:26 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Cc:     y2038@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Jeff Layton <jlayton@...hat.com>, linux-nilfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] nilfs2: use 64-bit superblock timstamps

The mount time field in the superblock uses a 64-bit timestamp, but
calling get_seconds() may truncate the current time to 32 bits.

This changes it to ktime_get_real_seconds() to avoid the potential
overflow.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/nilfs2/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 6ffeca84d7c3..1b9067cf4511 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -834,7 +834,7 @@ static int nilfs_setup_super(struct super_block *sb, int is_mount)
 		sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
 
 	sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
-	sbp[0]->s_mtime = cpu_to_le64(get_seconds());
+	sbp[0]->s_mtime = cpu_to_le64(ktime_get_real_seconds());
 
 skip_mount_setup:
 	sbp[0]->s_state =
-- 
2.9.0