Switching to iterate_shared

[Matthew Wilcox]

On Tue, Aug 16, 2022 at 08:11:31PM +0100, Matthew Wilcox wrote:
> fs/adfs/dir_f.c:        .iterate        = adfs_f_iterate,
> fs/adfs/dir_fplus.c:    .iterate        = adfs_fplus_iterate,
> 
> ADFS is read-only, so must be safe?

I just checked ADFS.  This isn't a f_ops ->iterate, this is a special
adfs_dir_ops.  ADFS already uses f_ops->iterate_shared.