Show optional collected per-sb io stats in /proc/<pid>/mountstats
for filesystems that do not implement their own show_stats() method
and opted-in to generic per-sb stats with sb_iostats_init().
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/proc_namespace.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c
index 49650e54d2f8..9054a909e031 100644
--- a/fs/proc_namespace.c
+++ b/fs/proc_namespace.c
@@ -11,6 +11,7 @@
#include <linux/nsproxy.h>
#include <linux/security.h>
#include <linux/fs_struct.h>
+#include <linux/fs_iostats.h>
#include <linux/sched/task.h>
#include "proc/internal.h" /* only for get_proc_task() in ->open() */
@@ -232,6 +233,21 @@ static int show_vfsstat(struct seq_file *m, struct vfsmount *mnt)
if (sb->s_op->show_stats) {
seq_putc(m, ' ');
err = sb->s_op->show_stats(m, mnt_path.dentry);
+ } else if (sb_has_iostats(sb)) {
+ struct sb_iostats *iostats = sb_iostats(sb);
+
+ /* Similar to /proc/<pid>/io */
+ seq_printf(m, "\n"
+ "\ttimes: %lld %lld\n"
+ "\trchar: %lld\n"
+ "\twchar: %lld\n"
+ "\tsyscr: %lld\n"
+ "\tsyscw: %lld\n",
+ iostats->start_time, ktime_get_seconds(),
+ sb_iostats_counter_read(sb, SB_IOSTATS_CHARS_RD),
+ sb_iostats_counter_read(sb, SB_IOSTATS_CHARS_WR),
+ sb_iostats_counter_read(sb, SB_IOSTATS_SYSCALLS_RD),
+ sb_iostats_counter_read(sb, SB_IOSTATS_SYSCALLS_WR));
}
seq_putc(m, '\n');
--
2.25.1
