get_info_super: report which other devices are thought to be working/failed.

To accurately detect when an array has been split and is now being
recombined, we need to track which other devices each thinks is
working.

We should never include a device in an array if it thinks that the
primary device has failed.

This patch just allows get_info_super to return a list of devices
and whether they are thought to be working or not.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 7 insertions, 2 deletions

diff --git a/super0.c b/super0.c
index a650c3e6..b9d149eb 100644
--- a/super0.c
+++ b/super0.c
@@ -339,11 +339,12 @@ static void uuid_from_super0(struct supertype *st, int uuid[4])
 	}
 }
 
-static void getinfo_super0(struct supertype *st, struct mdinfo *info)
+static void getinfo_super0(struct supertype *st, struct mdinfo *info, char *map)
 {
 	mdp_super_t *sb = st->sb;
 	int working = 0;
 	int i;
+	int map_disks = info->array.raid_disks;
 
 	info->array.major_version = sb->major_version;
 	info->array.minor_version = sb->minor_version;
@@ -391,8 +392,12 @@ static void getinfo_super0(struct supertype *st, struct mdinfo *info)
 		if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 		    (sb->disks[i].raid_disk < (unsigned)info->array.raid_disks) &&
 		    (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
-		    !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
+		    !(sb->disks[i].state & (1<<MD_DISK_FAULTY))) {
 			working ++;
+			if (map && i < map_disks)
+				map[i] = 1;
+		} else if (map && i < map_disks)
+			map[i] = 0;
 	info->array.working_disks = working;
 }