From 3e811f053aec66e8a6d2a0ee3d031e7c988e3d15 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 21 Aug 2018 22:01:13 -0700
Subject: [PATCH] fs/sysv/inode.c: use ktime_get_real_seconds() for superblock
stamp
get_seconds() is deprecated in favor of ktime_get_real_seconds(), which
returns a 64-bit timestamp.
In the SYSV file system, the superblock timestamp is only 32 bits wide,
and it is used to check whether a file system is clean, so the best
solution seems to be to force a wraparound and explicitly convert it to an
unsigned 32-bit value.
This is independent of the inode timestamps that are also 32-bit wide on
disk and that come from current_time().
Link: http://lkml.kernel.org/r/20180713145236.3152513-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/sysv/inode.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index bec9f79adb25a..499a20a5a0107 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -35,7 +35,7 @@
static int sysv_sync_fs(struct super_block *sb, int wait)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
- unsigned long time = get_seconds(), old_time;
+ u32 time = (u32)ktime_get_real_seconds(), old_time;
mutex_lock(&sbi->s_lock);
@@ -46,8 +46,8 @@ static int sysv_sync_fs(struct super_block *sb, int wait)
*/
old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
if (sbi->s_type == FSTYPE_SYSV4) {
- if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
- *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
+ if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38u - old_time))
+ *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38u - time);
*sbi->s_sb_time = cpu_to_fs32(sbi, time);
mark_buffer_dirty(sbi->s_bh2);
}
--
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