[PATCH 004 of 9] md: Clean up irregularity with raid autodetect.

[NeilBrown <neilb@suse.de>]

When a raid1 array is stopped, all components currently get added
to the list for auto-detection.  However we should really only add
components that were found by autodetection in the first place.
So add a flag to record that information, and use it.


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

### Diffstat output
 ./drivers/md/md.c           |    4 +++-
 ./include/linux/raid/md_k.h |    1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c	2008-02-22 15:46:10.000000000 +1100
+++ ./drivers/md/md.c	2008-02-22 15:46:25.000000000 +1100
@@ -1503,7 +1503,8 @@ static void export_rdev(mdk_rdev_t * rde
 	free_disk_sb(rdev);
 	list_del_init(&rdev->same_set);
 #ifndef MODULE
-	md_autodetect_dev(rdev->bdev->bd_dev);
+	if (test_bit(AutoDetected, &rdev->flags))
+		md_autodetect_dev(rdev->bdev->bd_dev);
 #endif
 	unlock_rdev(rdev);
 	kobject_put(&rdev->kobj);
@@ -6025,6 +6026,7 @@ static void autostart_arrays(int part)
 			MD_BUG();
 			continue;
 		}
+		set_bit(AutoDetected, &rdev->flags);
 		list_add(&rdev->same_set, &pending_raid_disks);
 		i_passed++;
 	}

diff .prev/include/linux/raid/md_k.h ./include/linux/raid/md_k.h
--- .prev/include/linux/raid/md_k.h	2008-02-22 15:46:25.000000000 +1100
+++ ./include/linux/raid/md_k.h	2008-02-22 15:46:25.000000000 +1100
@@ -83,6 +83,7 @@ struct mdk_rdev_s
 #define	BarriersNotsupp	5		/* BIO_RW_BARRIER is not supported */
 #define	AllReserved	6		/* If whole device is reserved for
 					 * one array */
+#define	AutoDetected	7		/* added by auto-detect */
 
 	int desc_nr;			/* descriptor index in the superblock */
 	int raid_disk;			/* role of device in array */