1 files changed, 130 insertions, 64 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 05febfd9f071..509171ca7fa8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1296,27 +1296,17 @@ static struct super_type super_types[] = {
 		.sync_super	= super_1_sync,
 	},
 };
-	
-static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
-{
-	struct list_head *tmp;
-	mdk_rdev_t *rdev;
-
-	ITERATE_RDEV(mddev,rdev,tmp)
-		if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
-			return rdev;
-
-	return NULL;
-}
 
 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
 {
-	struct list_head *tmp;
-	mdk_rdev_t *rdev;
+	struct list_head *tmp, *tmp2;
+	mdk_rdev_t *rdev, *rdev2;
 
 	ITERATE_RDEV(mddev1,rdev,tmp)
-		if (match_dev_unit(mddev2, rdev))
-			return 1;
+		ITERATE_RDEV(mddev2, rdev2, tmp2)
+			if (rdev->bdev->bd_contains ==
+			    rdev2->bdev->bd_contains)
+				return 1;
 
 	return 0;
 }
@@ -1325,10 +1315,10 @@ static LIST_HEAD(pending_raid_disks);
 
 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
 {
-	mdk_rdev_t *same_pdev;
-	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+	char b[BDEVNAME_SIZE];
 	struct kobject *ko;
 	char *s;
+	int err;
 
 	if (rdev->mddev) {
 		MD_BUG();
@@ -1342,14 +1332,6 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
 		else
 			mddev->size = rdev->size;
 	}
-	same_pdev = match_dev_unit(mddev, rdev);
-	if (same_pdev)
-		printk(KERN_WARNING
-			"%s: WARNING: %s appears to be on the same physical"
-	 		" disk as %s. True\n     protection against single-disk"
-			" failure might be compromised.\n",
-			mdname(mddev), bdevname(rdev->bdev,b),
-			bdevname(same_pdev->bdev,b2));
 
 	/* Verify rdev->desc_nr is unique.
 	 * If it is -1, assign a free number, else
@@ -1371,20 +1353,35 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
 	while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
 		*s = '!';
 			
-	list_add(&rdev->same_set, &mddev->disks);
 	rdev->mddev = mddev;
 	printk(KERN_INFO "md: bind<%s>\n", b);
 
 	rdev->kobj.parent = &mddev->kobj;
-	kobject_add(&rdev->kobj);
+	if ((err = kobject_add(&rdev->kobj)))
+		goto fail;
 
 	if (rdev->bdev->bd_part)
 		ko = &rdev->bdev->bd_part->kobj;
 	else
 		ko = &rdev->bdev->bd_disk->kobj;
-	sysfs_create_link(&rdev->kobj, ko, "block");
+	if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
+		kobject_del(&rdev->kobj);
+		goto fail;
+	}
+	list_add(&rdev->same_set, &mddev->disks);
 	bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
 	return 0;
+
+ fail:
+	printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
+	       b, mdname(mddev));
+	return err;
+}
+
+static void delayed_delete(struct work_struct *ws)
+{
+	mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
+	kobject_del(&rdev->kobj);
 }
 
 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
@@ -1399,7 +1396,12 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
 	printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
 	rdev->mddev = NULL;
 	sysfs_remove_link(&rdev->kobj, "block");
-	kobject_del(&rdev->kobj);
+
+	/* We need to delay this, otherwise we can deadlock when
+	 * writing to 'remove' to "dev/state"
+	 */
+	INIT_WORK(&rdev->del_work, delayed_delete);
+	schedule_work(&rdev->del_work);
 }
 
 /*
@@ -2985,7 +2987,9 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data)
 	mddev->kobj.k_name = NULL;
 	snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
 	mddev->kobj.ktype = &md_ktype;
-	kobject_register(&mddev->kobj);
+	if (kobject_register(&mddev->kobj))
+		printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
+		       disk->disk_name);
 	return NULL;
 }
 
@@ -3109,6 +3113,36 @@ static int do_md_run(mddev_t * mddev)
 		return -EINVAL;
 	}
 
+	if (pers->sync_request) {
+		/* Warn if this is a potentially silly
+		 * configuration.
+		 */
+		char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+		mdk_rdev_t *rdev2;
+		struct list_head *tmp2;
+		int warned = 0;
+		ITERATE_RDEV(mddev, rdev, tmp) {
+			ITERATE_RDEV(mddev, rdev2, tmp2) {
+				if (rdev < rdev2 &&
+				    rdev->bdev->bd_contains ==
+				    rdev2->bdev->bd_contains) {
+					printk(KERN_WARNING
+					       "%s: WARNING: %s appears to be"
+					       " on the same physical disk as"
+					       " %s.\n",
+					       mdname(mddev),
+					       bdevname(rdev->bdev,b),
+					       bdevname(rdev2->bdev,b2));
+					warned = 1;
+				}
+			}
+		}
+		if (warned)
+			printk(KERN_WARNING
+			       "True protection against single-disk"
+			       " failure might be compromised.\n");
+	}
+
 	mddev->recovery = 0;
 	mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
 	mddev->barriers_work = 1;
@@ -3133,9 +3167,12 @@ static int do_md_run(mddev_t * mddev)
 		bitmap_destroy(mddev);
 		return err;
 	}
-	if (mddev->pers->sync_request)
-		sysfs_create_group(&mddev->kobj, &md_redundancy_group);
-	else if (mddev->ro == 2) /* auto-readonly not meaningful */
+	if (mddev->pers->sync_request) {
+		if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
+			printk(KERN_WARNING
+			       "md: cannot register extra attributes for %s\n",
+			       mdname(mddev));
+	} else if (mddev->ro == 2) /* auto-readonly not meaningful */
 		mddev->ro = 0;
 
  	atomic_set(&mddev->writes_pending,0);
@@ -3149,7 +3186,9 @@ static int do_md_run(mddev_t * mddev)
 		if (rdev->raid_disk >= 0) {
 			char nm[20];
 			sprintf(nm, "rd%d", rdev->raid_disk);
-			sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
+			if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
+				printk("md: cannot register %s for %s\n",
+				       nm, mdname(mddev));
 		}
 	
 	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
@@ -3311,6 +3350,10 @@ static int do_md_stop(mddev_t * mddev, int mode)
 				set_disk_ro(disk, 0);
 			blk_queue_make_request(mddev->queue, md_fail_request);
 			mddev->pers->stop(mddev);
+			mddev->queue->merge_bvec_fn = NULL;
+			mddev->queue->unplug_fn = NULL;
+			mddev->queue->issue_flush_fn = NULL;
+			mddev->queue->backing_dev_info.congested_fn = NULL;
 			if (mddev->pers->sync_request)
 				sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
 
@@ -3357,6 +3400,9 @@ static int do_md_stop(mddev_t * mddev, int mode)
 				sysfs_remove_link(&mddev->kobj, nm);
 			}
 
+		/* make sure all delayed_delete calls have finished */
+		flush_scheduled_work();
+
 		export_array(mddev);
 
 		mddev->array_size = 0;
@@ -5343,6 +5389,48 @@ void md_do_sync(mddev_t *mddev)
 EXPORT_SYMBOL_GPL(md_do_sync);
 
 
+static int remove_and_add_spares(mddev_t *mddev)
+{
+	mdk_rdev_t *rdev;
+	struct list_head *rtmp;
+	int spares = 0;
+
+	ITERATE_RDEV(mddev,rdev,rtmp)
+		if (rdev->raid_disk >= 0 &&
+		    (test_bit(Faulty, &rdev->flags) ||
+		     ! test_bit(In_sync, &rdev->flags)) &&
+		    atomic_read(&rdev->nr_pending)==0) {
+			if (mddev->pers->hot_remove_disk(
+				    mddev, rdev->raid_disk)==0) {
+				char nm[20];
+				sprintf(nm,"rd%d", rdev->raid_disk);
+				sysfs_remove_link(&mddev->kobj, nm);
+				rdev->raid_disk = -1;
+			}
+		}
+
+	if (mddev->degraded) {
+		ITERATE_RDEV(mddev,rdev,rtmp)
+			if (rdev->raid_disk < 0
+			    && !test_bit(Faulty, &rdev->flags)) {
+				rdev->recovery_offset = 0;
+				if (mddev->pers->hot_add_disk(mddev,rdev)) {
+					char nm[20];
+					sprintf(nm, "rd%d", rdev->raid_disk);
+					if (sysfs_create_link(&mddev->kobj,
+							      &rdev->kobj, nm))
+						printk(KERN_WARNING
+						       "md: cannot register "
+						       "%s for %s\n",
+						       nm, mdname(mddev));
+					spares++;
+					md_new_event(mddev);
+				} else
+					break;
+			}
+	}
+	return spares;
+}
 /*
  * This routine is regularly called by all per-raid-array threads to
  * deal with generic issues like resync and super-block update.
@@ -5397,7 +5485,7 @@ void md_check_recovery(mddev_t *mddev)
 		return;
 
 	if (mddev_trylock(mddev)) {
-		int spares =0;
+		int spares = 0;
 
 		spin_lock_irq(&mddev->write_lock);
 		if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
@@ -5460,35 +5548,13 @@ void md_check_recovery(mddev_t *mddev)
 		 * Spare are also removed and re-added, to allow
 		 * the personality to fail the re-add.
 		 */
-		ITERATE_RDEV(mddev,rdev,rtmp)
-			if (rdev->raid_disk >= 0 &&
-			    (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
-			    atomic_read(&rdev->nr_pending)==0) {
-				if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
-					char nm[20];
-					sprintf(nm,"rd%d", rdev->raid_disk);
-					sysfs_remove_link(&mddev->kobj, nm);
-					rdev->raid_disk = -1;
-				}
-			}
-
-		if (mddev->degraded) {
-			ITERATE_RDEV(mddev,rdev,rtmp)
-				if (rdev->raid_disk < 0
-				    && !test_bit(Faulty, &rdev->flags)) {
-					rdev->recovery_offset = 0;
-					if (mddev->pers->hot_add_disk(mddev,rdev)) {
-						char nm[20];
-						sprintf(nm, "rd%d", rdev->raid_disk);
-						sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
-						spares++;
-						md_new_event(mddev);
-					} else
-						break;
-				}
-		}
 
-		if (spares) {
+		if (mddev->reshape_position != MaxSector) {
+			if (mddev->pers->check_reshape(mddev) != 0)
+				/* Cannot proceed */
+				goto unlock;
+			set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
+		} else if ((spares = remove_and_add_spares(mddev))) {
 			clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
 			clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
 		} else if (mddev->recovery_cp < MaxSector) {