linux-kernel - Re: [patch] usb: call bdev_read_only() only on CONFIG

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Date:	Tue, 27 Mar 2007 11:37:25 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] usb: call bdev_read_only() only on CONFIG_BLOCK

On Tue, Mar 27, 2007 at 02:03:25AM -0700, David Rientjes wrote:
> bdev_read_only() is only defined on CONFIG_BLOCK so we make sure not to
> call it unless we have it.  A new static inline function,
> is_inode_read_only(), is invoked to call bdev_read_only() on CONFIG_BLOCK
> and return zero otherwise.
> 
> Cc: Alan Stern <stern@...land.harvard.edu>
> Signed-off-by: David Rientjes <rientjes@...gle.com>
> ---
>  drivers/usb/gadget/file_storage.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
> --- a/drivers/usb/gadget/file_storage.c
> +++ b/drivers/usb/gadget/file_storage.c
> @@ -3493,6 +3493,14 @@ static int fsg_main_thread(void *fsg_)
>  	complete_and_exit(&fsg->thread_notifier, 0);
>  }
>  
> +#ifdef CONFIG_BLOCK
> +static inline int is_inode_read_only(struct inode *inode)
> +{
> +	return bdev_read_only(inode->i_bdev);
> +}
> +#else
> +#define is_inode_read_only(inode)	(0)
> +#endif

This looks like the wrong place to fix this.
Like we do with for exampel the pci_ functions we should provide a dummy
implementation in the kernel if configured without CONFIG_BLOCK.

In this way the decision to provide dummy functions are centralized
and benefits all users.

	Sam
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