bcachefs: Add btree_trans* to inode_set_fn

This will be used when we need to re-hash a directory tree when setting
flags.

It is not possible to have concurrent btree_trans on a thread.

Signed-off-by: Joshua Ashton <joshua@froggi.es>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
5 files changed