diff options
Diffstat (limited to 'fs/btrfs/extent-io-tree.c')
| -rw-r--r-- | fs/btrfs/extent-io-tree.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/btrfs/extent-io-tree.c b/fs/btrfs/extent-io-tree.c index 46f15a7ae66b..839e9401e5b3 100644 --- a/fs/btrfs/extent-io-tree.c +++ b/fs/btrfs/extent-io-tree.c @@ -105,6 +105,13 @@ void extent_io_tree_init(struct btrfs_fs_info *fs_info, lockdep_set_class(&tree->lock, &file_extent_tree_class); } +/* + * Empty an io tree, removing and freeing every extent state record from the + * tree. This should be called once we are sure no other task can access the + * tree anymore, so no tree updates happen after we empty the tree and there + * aren't any waiters on any extent state record (EXTENT_LOCKED bit is never + * set on any extent state when calling this function). + */ void extent_io_tree_release(struct extent_io_tree *tree) { spin_lock(&tree->lock); @@ -122,10 +129,7 @@ void extent_io_tree_release(struct extent_io_tree *tree) state = rb_entry(node, struct extent_state, rb_node); rb_erase(&state->rb_node, &tree->state); RB_CLEAR_NODE(&state->rb_node); - /* - * btree io trees aren't supposed to have tasks waiting for - * changes in the flags of extent states ever. - */ + ASSERT(!(state->state & EXTENT_LOCKED)); ASSERT(!waitqueue_active(&state->wq)); free_extent_state(state); |