1 files changed, 34 insertions, 24 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 41e2509bf896..a307f87eb90e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -214,12 +214,7 @@ static inline mddev_t *mddev_get(mddev_t *mddev)
 	return mddev;
 }
 
-static void mddev_delayed_delete(struct work_struct *ws)
-{
-	mddev_t *mddev = container_of(ws, mddev_t, del_work);
-	kobject_del(&mddev->kobj);
-	kobject_put(&mddev->kobj);
-}
+static void mddev_delayed_delete(struct work_struct *ws);
 
 static void mddev_put(mddev_t *mddev)
 {
@@ -474,7 +469,7 @@ void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
 	 * causes ENOTSUPP, we allocate a spare bio...
 	 */
 	struct bio *bio = bio_alloc(GFP_NOIO, 1);
-	int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
+	int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
 
 	bio->bi_bdev = rdev->bdev;
 	bio->bi_sector = sector;
@@ -531,7 +526,7 @@ int sync_page_io(struct block_device *bdev, sector_t sector, int size,
 	struct completion event;
 	int ret;
 
-	rw |= (1 << BIO_RW_SYNC);
+	rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
 
 	bio->bi_bdev = bdev;
 	bio->bi_sector = sector;
@@ -1481,6 +1476,11 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
 		if (find_rdev_nr(mddev, rdev->desc_nr))
 			return -EBUSY;
 	}
+	if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
+		printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
+		       mdname(mddev), mddev->max_disks);
+		return -EBUSY;
+	}
 	bdevname(rdev->bdev,b);
 	while ( (s=strchr(b, '/')) != NULL)
 		*s = '!';
@@ -2441,6 +2441,15 @@ static void analyze_sbs(mddev_t * mddev)
 
 	i = 0;
 	rdev_for_each(rdev, tmp, mddev) {
+		if (rdev->desc_nr >= mddev->max_disks ||
+		    i > mddev->max_disks) {
+			printk(KERN_WARNING
+			       "md: %s: %s: only %d devices permitted\n",
+			       mdname(mddev), bdevname(rdev->bdev, b),
+			       mddev->max_disks);
+			kick_rdev_from_array(rdev);
+			continue;
+		}
 		if (rdev != freshest)
 			if (super_types[mddev->major_version].
 			    validate_super(mddev, rdev)) {
@@ -3528,6 +3537,21 @@ static struct kobj_type md_ktype = {
 
 int mdp_major = 0;
 
+static void mddev_delayed_delete(struct work_struct *ws)
+{
+	mddev_t *mddev = container_of(ws, mddev_t, del_work);
+
+	if (mddev->private == &md_redundancy_group) {
+		sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
+		if (mddev->sysfs_action)
+			sysfs_put(mddev->sysfs_action);
+		mddev->sysfs_action = NULL;
+		mddev->private = NULL;
+	}
+	kobject_del(&mddev->kobj);
+	kobject_put(&mddev->kobj);
+}
+
 static int md_alloc(dev_t dev, char *name)
 {
 	static DEFINE_MUTEX(disks_mutex);
@@ -4019,13 +4043,9 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
 			mddev->queue->merge_bvec_fn = NULL;
 			mddev->queue->unplug_fn = NULL;
 			mddev->queue->backing_dev_info.congested_fn = NULL;
-			if (mddev->pers->sync_request) {
-				sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
-				if (mddev->sysfs_action)
-					sysfs_put(mddev->sysfs_action);
-				mddev->sysfs_action = NULL;
-			}
 			module_put(mddev->pers->owner);
+			if (mddev->pers->sync_request)
+				mddev->private = &md_redundancy_group;
 			mddev->pers = NULL;
 			/* tell userspace to handle 'inactive' */
 			sysfs_notify_dirent(mddev->sysfs_state);
@@ -4614,13 +4634,6 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
 	 * noticed in interrupt contexts ...
 	 */
 
-	if (rdev->desc_nr == mddev->max_disks) {
-		printk(KERN_WARNING "%s: can not hot-add to full array!\n",
-			mdname(mddev));
-		err = -EBUSY;
-		goto abort_unbind_export;
-	}
-
 	rdev->raid_disk = -1;
 
 	md_update_sb(mddev, 1);
@@ -4634,9 +4647,6 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
 	md_new_event(mddev);
 	return 0;
 
-abort_unbind_export:
-	unbind_rdev_from_array(rdev);
-
 abort_export:
 	export_rdev(rdev);
 	return err;