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authorFilipe Manana <fdmanana@suse.com>2014-12-04 18:38:30 +0000
committerChris Mason <clm@fb.com>2014-12-10 12:22:29 -0800
commit01eacb277909de942abbdff37584ad331e3893fe (patch)
tree3eb85559ed3ffff6ccafe960cd804eb91b890ad7 /fs/btrfs
parenta1e7e16ed36b9b059c5ee94e372287418e2dc7bc (diff)
Btrfs: always clear a block group node when removing it from the tree
Always clear a block group's rbnode after removing it from the rbtree to ensure that any tasks that might be holding a reference on the block group don't end up accessing stale rbnode left and right child pointers through next_block_group(). This is a leftover from the change titled: "Btrfs: fix invalid block group rbtree access after bg is removed" Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/extent-tree.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 222d6aea4a8a..974b3edf69c7 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8872,6 +8872,7 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
cache_node);
rb_erase(&block_group->cache_node,
&info->block_group_cache_tree);
+ RB_CLEAR_NODE(&block_group->cache_node);
spin_unlock(&info->block_group_cache_lock);
down_write(&block_group->space_info->groups_sem);
@@ -9130,6 +9131,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
spin_lock(&info->block_group_cache_lock);
rb_erase(&cache->cache_node,
&info->block_group_cache_tree);
+ RB_CLEAR_NODE(&cache->cache_node);
spin_unlock(&info->block_group_cache_lock);
btrfs_put_block_group(cache);
goto error;
@@ -9271,6 +9273,7 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
spin_lock(&root->fs_info->block_group_cache_lock);
rb_erase(&cache->cache_node,
&root->fs_info->block_group_cache_tree);
+ RB_CLEAR_NODE(&cache->cache_node);
spin_unlock(&root->fs_info->block_group_cache_lock);
btrfs_put_block_group(cache);
return ret;