Re: [PATCH v23 04/22] vfs: Make the inode passed to inode_change_ok non-const

[Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On Thu, 2016-06-30 at 15:46 +0200, Andreas Gruenbacher wrote:
> We will need to call iop->permission and iop->get_acl from
> inode_change_ok() for additional permission checks, and both take a
> non-const inode.
> 
> Signed-off-by: Andreas Gruenbacher <agruenba-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Reviewed-by: J. Bruce Fields <bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Reviewed-by: Andreas Dilger <adilger-m1MBpc4rdrD3fQ9qLvQP4Q@public.gmane.org>
> Reviewed-by: Steve French <steve.french-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org>
> ---
>  fs/attr.c          | 2 +-
>  include/linux/fs.h | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/attr.c b/fs/attr.c
> index 25b24d0..7ca7fa0 100644
> --- a/fs/attr.c
> +++ b/fs/attr.c
> @@ -28,7 +28,7 @@
>   * Should be called as the first thing in ->setattr implementations,
>   * possibly after taking additional locks.
>   */
> -int inode_change_ok(const struct inode *inode, struct iattr *attr)
> +int inode_change_ok(struct inode *inode, struct iattr *attr)
>  {
>  	unsigned int ia_valid = attr->ia_valid;
>  
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 86bfa10..208f73b 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2993,7 +2993,7 @@ extern int buffer_migrate_page(struct address_space *,
>  #define buffer_migrate_page NULL
>  #endif
>  
> -extern int inode_change_ok(const struct inode *, struct iattr *);
> +extern int inode_change_ok(struct inode *, struct iattr *);
>  extern int inode_newsize_ok(const struct inode *, loff_t offset);
>  extern void setattr_copy(struct inode *inode, const struct iattr *attr);
>  

Yuck. Bummer to lose the "const" there, but it doesn't look like it's
possible to make those ops take a const arg.

Reviewed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>