From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 22 Aug 2018 04:59:05 +0000 (-0700)
Subject: nilfs2: use 64-bit superblock timstamps
X-Git-Tag: for-linus-20180825~8^2~47
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=21a1a52dbdd5c9dc17c546bbdb95038f53515d2c;p=linux-block.git

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.

Link: http://lkml.kernel.org/r/20180620075041.4154396-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: David Howells <dhowells@redhat.com>
Cc: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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 =