Commit 75bfb9af authored by Josef Bacik's avatar Josef Bacik Committed by Chris Mason
Browse files

Btrfs: cleanup error handling in build_backref_tree 



When balance panics it tends to panic in the

BUG_ON(!upper->checked);

test, because it means it couldn't build the backref tree properly.  This is
annoying to users and frankly a recoverable error, nothing in this function is
actually fatal since it is just an in-memory building of the backrefs for a
given bytenr.  So go through and change all the BUG_ON()'s to ASSERT()'s, and
fix the BUG_ON(!upper->checked) thing to just return an error.

This patch also fixes the error handling so it tears down the work we've done
properly.  This code was horribly broken since we always just panic'ed instead
of actually erroring out, so it needed to be completely re-worked.  With this
patch my broken image no longer panics when I mount it.  Thanks,

Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 1d52c78a

fs/btrfs/relocation.c

+59 −29
Original line number Diff line number Diff line
@@ -736,7 +736,8 @@ again: 
		err = ret;

		goto out;

	}

	BUG_ON(!ret || !path1->slots[0]);

	ASSERT(ret);

	ASSERT(path1->slots[0]);



	path1->slots[0]--;
@@ -746,10 +747,10 @@ again: 
		 * the backref was added previously when processing

		 * backref of type BTRFS_TREE_BLOCK_REF_KEY

		 */

		BUG_ON(!list_is_singular(&cur->upper));

		ASSERT(list_is_singular(&cur->upper));

		edge = list_entry(cur->upper.next, struct backref_edge,

				  list[LOWER]);

		BUG_ON(!list_empty(&edge->list[UPPER]));

		ASSERT(list_empty(&edge->list[UPPER]));

		exist = edge->node[UPPER];

		/*

		 * add the upper level block to pending list if we need
@@ -831,7 +832,7 @@ again: 
					cur->cowonly = 1;

			}

#else

		BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY);

		ASSERT(key.type != BTRFS_EXTENT_REF_V0_KEY);

		if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) {

#endif

			if (key.objectid == key.offset) {
@@ -840,7 +841,7 @@ again: 
				 * backref of this type.

				 */

				root = find_reloc_root(rc, cur->bytenr);

				BUG_ON(!root);

				ASSERT(root);

				cur->root = root;

				break;

			}
@@ -868,7 +869,7 @@ again: 
			} else {

				upper = rb_entry(rb_node, struct backref_node,

						 rb_node);

				BUG_ON(!upper->checked);

				ASSERT(upper->checked);

				INIT_LIST_HEAD(&edge->list[UPPER]);

			}

			list_add_tail(&edge->list[LOWER], &cur->upper);
@@ -892,7 +893,7 @@ again: 


		if (btrfs_root_level(&root->root_item) == cur->level) {

			/* tree root */

			BUG_ON(btrfs_root_bytenr(&root->root_item) !=

			ASSERT(btrfs_root_bytenr(&root->root_item) ==

			       cur->bytenr);

			if (should_ignore_root(root))

				list_add(&cur->list, &useless);
@@ -927,7 +928,7 @@ again: 
		need_check = true;

		for (; level < BTRFS_MAX_LEVEL; level++) {

			if (!path2->nodes[level]) {

				BUG_ON(btrfs_root_bytenr(&root->root_item) !=

				ASSERT(btrfs_root_bytenr(&root->root_item) ==

				       lower->bytenr);

				if (should_ignore_root(root))

					list_add(&lower->list, &useless);
@@ -982,7 +983,7 @@ again: 
			} else {

				upper = rb_entry(rb_node, struct backref_node,

						 rb_node);

				BUG_ON(!upper->checked);

				ASSERT(upper->checked);

				INIT_LIST_HEAD(&edge->list[UPPER]);

				if (!upper->owner)

					upper->owner = btrfs_header_owner(eb);
@@ -1026,7 +1027,7 @@ next: 
	 * everything goes well, connect backref nodes and insert backref nodes

	 * into the cache.

	 */

	BUG_ON(!node->checked);

	ASSERT(node->checked);

	cowonly = node->cowonly;

	if (!cowonly) {

		rb_node = tree_insert(&cache->rb_root, node->bytenr,
@@ -1062,8 +1063,21 @@ next: 
			continue;

		}



		BUG_ON(!upper->checked);

		BUG_ON(cowonly != upper->cowonly);

		if (!upper->checked) {

			/*

			 * Still want to blow up for developers since this is a

			 * logic bug.

			 */

			ASSERT(0);

			err = -EINVAL;

			goto out;

		}

		if (cowonly != upper->cowonly) {

			ASSERT(0);

			err = -EINVAL;

			goto out;

		}



		if (!cowonly) {

			rb_node = tree_insert(&cache->rb_root, upper->bytenr,

					      &upper->rb_node);
@@ -1086,7 +1100,7 @@ next: 
	while (!list_empty(&useless)) {

		upper = list_entry(useless.next, struct backref_node, list);

		list_del_init(&upper->list);

		BUG_ON(!list_empty(&upper->upper));

		ASSERT(list_empty(&upper->upper));

		if (upper == node)

			node = NULL;

		if (upper->lowest) {
@@ -1119,29 +1133,45 @@ out: 
	if (err) {

		while (!list_empty(&useless)) {

			lower = list_entry(useless.next,

					   struct backref_node, upper);

			list_del_init(&lower->upper);

		}

		upper = node;

		INIT_LIST_HEAD(&list);

		while (upper) {

			if (RB_EMPTY_NODE(&upper->rb_node)) {

				list_splice_tail(&upper->upper, &list);

				free_backref_node(cache, upper);

					   struct backref_node, list);

			list_del_init(&lower->list);

		}



			if (list_empty(&list))

				break;



			edge = list_entry(list.next, struct backref_edge,

					  list[LOWER]);

		while (!list_empty(&list)) {

			edge = list_first_entry(&list, struct backref_edge,

						list[UPPER]);

			list_del(&edge->list[UPPER]);

			list_del(&edge->list[LOWER]);

			lower = edge->node[LOWER];

			upper = edge->node[UPPER];

			free_backref_edge(cache, edge);



			/*

			 * Lower is no longer linked to any upper backref nodes

			 * and isn't in the cache, we can free it ourselves.

			 */

			if (list_empty(&lower->upper) &&

			    RB_EMPTY_NODE(&lower->rb_node))

				list_add(&lower->list, &useless);



			if (!RB_EMPTY_NODE(&upper->rb_node))

				continue;



			/* Add this guy's upper edges to the list to proces */

			list_for_each_entry(edge, &upper->upper, list[LOWER])

				list_add_tail(&edge->list[UPPER], &list);

			if (list_empty(&upper->upper))

				list_add(&upper->list, &useless);

		}



		while (!list_empty(&useless)) {

			lower = list_entry(useless.next,

					   struct backref_node, list);

			list_del_init(&lower->list);

			free_backref_node(cache, lower);

		}

		return ERR_PTR(err);

	}

	BUG_ON(node && node->detached);

	ASSERT(!node || !node->detached);

	return node;

}

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