On Thu, Sep 27, 2007 at 03:51:07PM +0200, Peter Zijlstra wrote: > Christoph, > > does Steve's story make sense?
Yes. > All that would need to be done is add an extra lock_class_key to > file_system_type for i_mutex_dir_key, and extend alloc_inode to say > something like: > > if (dir) > lockdep_set_class(&inode->i_mutex, &sb->s_type->i_mutex_dir_key); > else > lockdep_set_class(&inode->i_mutex, &sb->s_type->i_mutex_key); Unfortunately we don't know what type of inode we have when calling alloc_inode. We only know it after reading in the inode from disk, aka in unlock_new_inode. Then again there is no reason to use i_mutex before unlock_new_inode returns, so maybe we could defer initializing it until unlock_new_inode. I'm pretty sure we'll have to fix a few filesystems that take i_mutex before that despite not needing it, e.g. through i_size_write, though. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/