linux-kernel - Re: [PATCH v2 1/2] debugfs: Export bool read/write functions

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Date:	Fri, 17 Jul 2015 19:22:12 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>,
	gregkh@...uxfoundation.org
Cc:	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] debugfs: Export bool read/write functions

On Tue, Jun 23, 2015 at 02:32:54PM +0100, Richard Fitzgerald wrote:
> The file read/write functions for bools have no special dependencies
> on debugfs internals and are sufficiently non-trivial to be worth
> exporting so clients can re-use the implementation.

Greg, I'm assuming you're OK with this?  Please shout if not.

> Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
> ---
>  fs/debugfs/file.c       |   14 ++++++++------
>  include/linux/debugfs.h |   20 ++++++++++++++++++++
>  2 files changed, 28 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
> index 830a7e7..95ae5ee 100644
> --- a/fs/debugfs/file.c
> +++ b/fs/debugfs/file.c
> @@ -447,8 +447,8 @@ struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
>  }
>  EXPORT_SYMBOL_GPL(debugfs_create_atomic_t);
>  
> -static ssize_t read_file_bool(struct file *file, char __user *user_buf,
> -			      size_t count, loff_t *ppos)
> +ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
> +			       size_t count, loff_t *ppos)
>  {
>  	char buf[3];
>  	u32 *val = file->private_data;
> @@ -461,9 +461,10 @@ static ssize_t read_file_bool(struct file *file, char __user *user_buf,
>  	buf[2] = 0x00;
>  	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
>  }
> +EXPORT_SYMBOL_GPL(debugfs_read_file_bool);
>  
> -static ssize_t write_file_bool(struct file *file, const char __user *user_buf,
> -			       size_t count, loff_t *ppos)
> +ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
> +				size_t count, loff_t *ppos)
>  {
>  	char buf[32];
>  	size_t buf_size;
> @@ -480,10 +481,11 @@ static ssize_t write_file_bool(struct file *file, const char __user *user_buf,
>  
>  	return count;
>  }
> +EXPORT_SYMBOL_GPL(debugfs_write_file_bool);
>  
>  static const struct file_operations fops_bool = {
> -	.read =		read_file_bool,
> -	.write =	write_file_bool,
> +	.read =		debugfs_read_file_bool,
> +	.write =	debugfs_write_file_bool,
>  	.open =		simple_open,
>  	.llseek =	default_llseek,
>  };
> diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
> index cb25af4..1545962 100644
> --- a/include/linux/debugfs.h
> +++ b/include/linux/debugfs.h
> @@ -117,6 +117,12 @@ struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
>  
>  bool debugfs_initialized(void);
>  
> +ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
> +			       size_t count, loff_t *ppos);
> +
> +ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
> +				size_t count, loff_t *ppos);
> +
>  #else
>  
>  #include <linux/err.h>
> @@ -283,6 +289,20 @@ static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
>  	return ERR_PTR(-ENODEV);
>  }
>  
> +static inline ssize_t debugfs_read_file_bool(struct file *file,
> +					     char __user *user_buf,
> +					     size_t count, loff_t *ppos)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline ssize_t debugfs_write_file_bool(struct file *file,
> +					      const char __user *user_buf,
> +					      size_t count, loff_t *ppos)
> +{
> +	return -ENODEV;
> +}
> +
>  #endif
>  
>  #endif
> -- 
> 1.7.2.5
> 
> 

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