[PATCH] md: add information about superblock version to /proc/mdstat

Leave it unchanged if the original (0.90) is used, incase it might be a
compatability problem.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 39b917bc0fc0..0a13016829da 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3346,6 +3346,15 @@ static int md_seq_show(struct seq_file *seq, void *v)
                                 seq_printf(seq, "\n      %llu blocks",
                                         (unsigned long long)size);
                 }
+                if (mddev->persistent) {
+                        if (mddev->major_version != 0 ||
+                            mddev->minor_version != 90) {
+                                seq_printf(seq," super %d.%d",
+                                           mddev->major_version,
+                                           mddev->minor_version);
+                        }
+                } else
+                        seq_printf(seq, " super non-persistent");
 
                 if (mddev->pers) {
                         mddev->pers->status (seq, mddev);