bcachefs: Clear fs_path_parent on subvolume unlink

This fixes recursive subvolume removal.

Subvolume deletion is asynchronous; fs_path_parent, and thus the entry
in the subvolume_children btree, need to be cleared when the subvolume
is unlinked from the fs heirarchy - else we'll spuriously think a
subvolume has children and deletion will fail.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/subvolume.c b/fs/bcachefs/subvolume.c
index b7b96283c3161d9b2921a9c5d0c37d457407c3b5..cd0d8e5e44e7909b102f3c21dd763d5896848200 100644 (file)
--- a/fs/bcachefs/subvolume.c
+++ b/fs/bcachefs/subvolume.c
@@ -561,6 +561,7 @@ int bch2_subvolume_unlink(struct btree_trans *trans, u32 subvolid)
        }
 
        SET_BCH_SUBVOLUME_UNLINKED(&n->v, true);
+       n->v.fs_path_parent = 0;
        bch2_trans_iter_exit(trans, &iter);
        return ret;
 }