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Commit 6bef4d31 authored by Eric Paris's avatar Eric Paris Committed by Chris Mason
Browse files

Btrfs: use RB_ROOT to intialize rb_trees instead of setting rb_node to NULL 



btrfs inialize rb trees in quite a number of places by settin rb_node =
NULL;  The problem with this is that 17d9ddc7 in the
linux-next tree adds a new field to that struct which needs to be NULL for
the new rbtree library code to work properly.  This patch uses RB_ROOT as
the intializer so all of the relevant fields will be NULL'd.  Without the
patch I get a panic.

Signed-off-by: default avatarEric Paris <eparis@redhat.com>
Acked-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 3f6fae95

fs/btrfs/disk-io.c

+2 −2
Original line number Diff line number Diff line
@@ -901,7 +901,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 
	root->highest_objectid = 0;

	root->name = NULL;

	root->in_sysfs = 0;

	root->inode_tree.rb_node = NULL;

	root->inode_tree = RB_ROOT;



	INIT_LIST_HEAD(&root->dirty_list);

	INIT_LIST_HEAD(&root->orphan_list);
@@ -1673,7 +1673,7 @@ struct btrfs_root *open_ctree(struct super_block *sb, 
	insert_inode_hash(fs_info->btree_inode);



	spin_lock_init(&fs_info->block_group_cache_lock);

	fs_info->block_group_cache_tree.rb_node = NULL;

	fs_info->block_group_cache_tree = RB_ROOT;



	extent_io_tree_init(&fs_info->freed_extents[0],

			     fs_info->btree_inode->i_mapping, GFP_NOFS);

fs/btrfs/extent_io.c

+2 −2
Original line number Diff line number Diff line
@@ -104,8 +104,8 @@ void extent_io_exit(void) 
void extent_io_tree_init(struct extent_io_tree *tree,

			  struct address_space *mapping, gfp_t mask)

{

	tree->state.rb_node = NULL;

	tree->buffer.rb_node = NULL;

	tree->state = RB_ROOT;

	tree->buffer = RB_ROOT;

	tree->ops = NULL;

	tree->dirty_bytes = 0;

	spin_lock_init(&tree->lock);

fs/btrfs/extent_map.c

+1 −1
Original line number Diff line number Diff line
@@ -35,7 +35,7 @@ void extent_map_exit(void) 
 */

void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask)

{

	tree->map.rb_node = NULL;

	tree->map = RB_ROOT;

	rwlock_init(&tree->lock);

}

fs/btrfs/free-space-cache.c

+2 −2
Original line number Diff line number Diff line
@@ -870,7 +870,7 @@ __btrfs_return_cluster_to_free_space( 
		tree_insert_offset(&block_group->free_space_offset,

				   entry->offset, &entry->offset_index, 0);

	}

	cluster->root.rb_node = NULL;

	cluster->root = RB_ROOT;



out:

	spin_unlock(&cluster->lock);
@@ -1355,7 +1355,7 @@ void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) 
{

	spin_lock_init(&cluster->lock);

	spin_lock_init(&cluster->refill_lock);

	cluster->root.rb_node = NULL;

	cluster->root = RB_ROOT;

	cluster->max_size = 0;

	cluster->points_to_bitmap = false;

	INIT_LIST_HEAD(&cluster->block_group_list);

fs/btrfs/ordered-data.h

+1 −1
Original line number Diff line number Diff line
@@ -129,7 +129,7 @@ static inline void 
btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)

{

	mutex_init(&t->mutex);

	t->tree.rb_node = NULL;

	t->tree = RB_ROOT;

	t->last = NULL;

}