md: clean up irregularity with raid autodetect

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index b375de5..a71241c 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1503,7 +1503,8 @@ static void export_rdev(mdk_rdev_t * rdev)
        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 --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 85a068b..7bb6d1a 100644 (file)
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -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 */