On Thu, Nov 24, 2022 at 10:47:55AM +0900, Damien Le Moal wrote: > >> + inode_lock(src_inode); > >> + inode_lock(dst_inode); > > > > So you did zonefs_copy_file_checks() outside of these locks, which mean > > that everything about the source and destination files may have changed. > > This does not work. > > I forgot to mention that locking 2 inodes blindly like this can leads to > deadlocks if another process tries a copy range from dst to src at the > same time (lock order is reversed and so can deadlock). Not to mention the deadlocks with existing places where fs/namei.c locks two inodes...
