staging/lustre: use 64-bit llite debugfs timestamps

The llite debugfs interface contains timestamps that are computed
from timeval, which overflows in 2038 on 32-bit systems.

This changes the output to use a timespec64 type to avoid the
overflow. I also change the format to print the sub-second portion
as 9 digits (nanoseconds) for clarity, rather than printing six
digits without leading zeroes.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/llite/lproc_llite.c b/drivers/staging/lustre/lustre/llite/lproc_llite.c
index 427a34b00e8504333ecb5bf4196c148731138e8f..08d32027d7be0b1da1eeac6d8db8196168017eb7 100644 (file)
--- a/drivers/staging/lustre/lustre/llite/lproc_llite.c
+++ b/drivers/staging/lustre/lustre/llite/lproc_llite.c
@@ -1140,20 +1140,20 @@ static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
 
 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
 {
-       struct timeval now;
+       struct timespec64 now;
        struct ll_sb_info *sbi = seq->private;
        struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
        int k;
 
-       do_gettimeofday(&now);
+       ktime_get_real_ts64(&now);
 
        if (!sbi->ll_rw_stats_on) {
                seq_printf(seq, "disabled\n"
                           "write anything in this file to activate, then 0 or \"[D/d]isabled\" to deactivate\n");
                return 0;
        }
-       seq_printf(seq, "snapshot_time:  %lu.%lu (secs.usecs)\n",
-                  now.tv_sec, (unsigned long)now.tv_usec);
+       seq_printf(seq, "snapshot_time:  %llu.%09lu (secs.usecs)\n",
+                  (s64)now.tv_sec, (unsigned long)now.tv_nsec);
        seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
        seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
                   "extents", "calls", "%", "cum%",
@@ -1219,19 +1219,19 @@ LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
 
 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
 {
-       struct timeval now;
+       struct timespec64 now;
        struct ll_sb_info *sbi = seq->private;
        struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
 
-       do_gettimeofday(&now);
+       ktime_get_real_ts64(&now);
 
        if (!sbi->ll_rw_stats_on) {
                seq_printf(seq, "disabled\n"
                           "write anything in this file to activate, then 0 or \"[D/d]isabled\" to deactivate\n");
                return 0;
        }
-       seq_printf(seq, "snapshot_time:  %lu.%lu (secs.usecs)\n",
-                  now.tv_sec, (unsigned long)now.tv_usec);
+       seq_printf(seq, "snapshot_time:  %llu.%09lu (secs.usecs)\n",
+                  (u64)now.tv_sec, (unsigned long)now.tv_nsec);
 
        seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
        seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
@@ -1396,13 +1396,13 @@ void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
 
 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
 {
-       struct timeval now;
+       struct timespec64 now;
        struct ll_sb_info *sbi = seq->private;
        struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
        struct ll_rw_process_info *process = sbi->ll_rw_process_info;
        int i;
 
-       do_gettimeofday(&now);
+       ktime_get_real_ts64(&now);
 
        if (!sbi->ll_rw_stats_on) {
                seq_printf(seq, "disabled\n"
@@ -1411,8 +1411,8 @@ static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
        }
        spin_lock(&sbi->ll_process_lock);
 
-       seq_printf(seq, "snapshot_time:  %lu.%lu (secs.usecs)\n",
-                  now.tv_sec, (unsigned long)now.tv_usec);
+       seq_printf(seq, "snapshot_time:  %llu.%09lu (secs.usecs)\n",
+                  (s64)now.tv_sec, (unsigned long)now.tv_nsec);
        seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
                   "R/W", "PID", "RANGE START", "RANGE END",
                   "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");