On Mon 14-08-17 23:12:22, Dan Williams wrote:
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index ff151814a02d..73fdc0ada9ee 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -306,6 +306,7 @@ struct vm_area_struct {
> struct mm_struct *vm_mm; /* The address space we belong to. */
> pgprot_t vm_page_prot; /* Access permissions of this VMA. */
> unsigned long vm_flags; /* Flags, see mm.h. */
> + unsigned long fs_flags; /* fs flags, see MAP_DIRECT etc */
>
> /*
> * For areas with an address space and backing store,
Ah, OK, here are VMA flags I was missing in the previous patch :) But why
did you create separate fs_flags field for this? on 64-bit archs there's
still space in vm_flags and frankly I don't see why we should separate
MAP_DIRECT or MAP_SYNC from other flags? After all a difference in these
flags must also prevent VMA merging (which you forgot to handle I think)
and they need to be copied on split (which happens by chance even now).
Honza
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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