linux-kernel - Re: [PATCH 31/38] vfs: Convert gadgetfs to fs

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Date:   Wed, 20 Mar 2019 08:57:24 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     David Howells <dhowells@...hat.com>, viro@...iv.linux.org.uk
Cc:     linux-usb@...r.kernel.org, dhowells@...hat.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 31/38] vfs: Convert gadgetfs to fs_context

David Howells <dhowells@...hat.com> writes:

> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Felipe Balbi <balbi@...nel.org>
> cc: linux-usb@...r.kernel.org
> ---
>
>  drivers/usb/gadget/legacy/inode.c |   21 +++++++++++++++------
>  1 file changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
> index 249277d0e53f..441da16ffc39 100644
> --- a/drivers/usb/gadget/legacy/inode.c
> +++ b/drivers/usb/gadget/legacy/inode.c
> @@ -12,6 +12,7 @@
>  #include <linux/init.h>
>  #include <linux/module.h>
>  #include <linux/fs.h>
> +#include <linux/fs_context.h>
>  #include <linux/pagemap.h>
>  #include <linux/uts.h>
>  #include <linux/wait.h>
> @@ -1990,7 +1991,7 @@ static const struct super_operations gadget_fs_operations = {
>  };
>  
>  static int
> -gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
> +gadgetfs_fill_super (struct super_block *sb, struct fs_context *fc)
>  {
>  	struct inode	*inode;
>  	struct dev_data	*dev;
> @@ -2044,11 +2045,19 @@ gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
>  }
>  
>  /* "mount -t gadgetfs path /dev/gadget" ends up here */
> -static struct dentry *
> -gadgetfs_mount (struct file_system_type *t, int flags,
> -		const char *path, void *opts)
> +static int gadgetfs_get_tree(struct fs_context *fc)
>  {
> -	return mount_single (t, flags, opts, gadgetfs_fill_super);
> +	return vfs_get_super(fc, vfs_get_single_super, gadgetfs_fill_super);
> +}
> +
> +static const struct fs_context_operations gadgetfs_context_ops = {
> +	.get_tree	= gadgetfs_get_tree,
> +};
> +
> +static int gadgetfs_init_fs_context(struct fs_context *fc)
> +{
> +	fc->ops = &gadgetfs_context_ops;
> +	return 0;
>  }
>  
>  static void
> @@ -2068,7 +2077,7 @@ gadgetfs_kill_sb (struct super_block *sb)
>  static struct file_system_type gadgetfs_type = {
>  	.owner		= THIS_MODULE,
>  	.name		= shortname,
> -	.mount		= gadgetfs_mount,
> +	.init_fs_context = gadgetfs_init_fs_context,
>  	.kill_sb	= gadgetfs_kill_sb,
>  };
>  MODULE_ALIAS_FS("gadgetfs");

looks like a mostly mechanical change. Do you want this to go through
the USB tree or FS tree?

Also, do you mind doing the same for drivers/usb/gadget/function/f_fs.c?

cheers

-- 
balbi

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