[PATCH] md: allow an md personality to refuse a hot-remove request.

This isn't really needed at the moment, but it is more consistant with the
interface and may be needed later.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/md.c

@@ -3445,8 +3445,8 @@ void md_check_recovery(mddev_t *mddev)
 			if (rdev->raid_disk >= 0 &&
 			    rdev->faulty &&
 			    atomic_read(&rdev->nr_pending)==0) {
-				mddev->pers->hot_remove_disk(mddev, rdev->raid_disk);
-				rdev->raid_disk = -1;
+				if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0)
+					rdev->raid_disk = -1;
 			}
 			if (!rdev->faulty && rdev->raid_disk >= 0 && !rdev->in_sync)
 				spares++;