reiserfs: use monotonic time for j_trans_start_time
Using CLOCK_REALTIME time_t timestamps breaks on 32-bit systems in 2038,
and gives surprising results with a concurrent settimeofday().
This changes the reiserfs journal timestamps to use ktime_get_seconds()
instead, which makes it use a 64-bit CLOCK_MONOTONIC stamp.
In the procfs output, the monotonic timestamp needs to be converted back
to CLOCK_REALTIME to keep the existing ABI.
Link: http://lkml.kernel.org/r/20180620142522.27639-2-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/reiserfs/procfs.c b/fs/reiserfs/procfs.c
index e39b391..f2cf344 100644
--- a/fs/reiserfs/procfs.c
+++ b/fs/reiserfs/procfs.c
@@ -297,6 +297,13 @@ static int show_oidmap(struct seq_file *m, void *unused)
return 0;
}
+static time64_t ktime_mono_to_real_seconds(time64_t mono)
+{
+ ktime_t kt = ktime_set(mono, NSEC_PER_SEC/2);
+
+ return ktime_divns(ktime_mono_to_real(kt), NSEC_PER_SEC);
+}
+
static int show_journal(struct seq_file *m, void *unused)
{
struct super_block *sb = m->private;
@@ -325,7 +332,7 @@ static int show_journal(struct seq_file *m, void *unused)
"j_bcount: \t%lu\n"
"j_first_unflushed_offset: \t%lu\n"
"j_last_flush_trans_id: \t%u\n"
- "j_trans_start_time: \t%li\n"
+ "j_trans_start_time: \t%lli\n"
"j_list_bitmap_index: \t%i\n"
"j_must_wait: \t%i\n"
"j_next_full_flush: \t%i\n"
@@ -366,7 +373,7 @@ static int show_journal(struct seq_file *m, void *unused)
JF(j_bcount),
JF(j_first_unflushed_offset),
JF(j_last_flush_trans_id),
- JF(j_trans_start_time),
+ ktime_mono_to_real_seconds(JF(j_trans_start_time)),
JF(j_list_bitmap_index),
JF(j_must_wait),
JF(j_next_full_flush),
