linux-kernel - Re: [RFC PATCH 14/68] vfs: Convert drm to use the new mount API

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Date:   Thu, 28 Mar 2019 08:47:12 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     David Howells <dhowells@...hat.com>
Cc:     viro@...iv.linux.org.uk, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 14/68] vfs: Convert drm to use the new mount API

On Wed, Mar 27, 2019 at 11:42:18PM +0000, David Howells wrote:
> Convert the drm filesystem to the new internal mount API as the old
> one will be obsoleted and removed.  This allows greater flexibility in
> communication of mount parameters between userspace, the VFS and the
> filesystem.
> 
> See Documentation/filesystems/mount_api.txt for more information.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: David Airlie <airlied@...ux.ie>
> cc: Daniel Vetter <daniel@...ll.ch>
> cc: dri-devel@...ts.freedesktop.org

No clue about vfs, but feel free to merge through whatever tree this is
suitable for.

Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>

> ---
> 
>  drivers/gpu/drm/drm_drv.c |   14 ++++++--------
>  1 file changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 381581b01d48..9eead5a478de 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -31,6 +31,7 @@
>  #include <linux/module.h>
>  #include <linux/moduleparam.h>
>  #include <linux/mount.h>
> +#include <linux/fs_context.h>
>  #include <linux/slab.h>
>  #include <linux/srcu.h>
>  
> @@ -413,20 +414,17 @@ static const struct super_operations drm_fs_sops = {
>  	.statfs		= simple_statfs,
>  };
>  
> -static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
> -				   const char *dev_name, void *data)
> +static int drm_fs_init_fs_context(struct fs_context *fc)
>  {
> -	return mount_pseudo(fs_type,
> -			    "drm:",
> -			    &drm_fs_sops,
> -			    &drm_fs_dops,
> -			    0x010203ff);
> +	return vfs_init_pseudo_fs_context(fc, "drm:",
> +					  &drm_fs_sops, NULL,
> +					  &drm_fs_dops, 0x010203ff);
>  }
>  
>  static struct file_system_type drm_fs_type = {
>  	.name		= "drm",
>  	.owner		= THIS_MODULE,
> -	.mount		= drm_fs_mount,
> +	.init_fs_context = drm_fs_init_fs_context,
>  	.kill_sb	= kill_anon_super,
>  };
>  
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch