linux-kernel - Re: [PATCH 08/10] staging: lustre: move misc-device registration closer to related code.

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Date:   Wed, 2 May 2018 19:12:35 +0100 (BST)
From:   James Simmons <jsimmons@...radead.org>
To:     NeilBrown <neilb@...e.com>
cc:     Oleg Drokin <oleg.drokin@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Dilger <andreas.dilger@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 08/10] staging: lustre: move misc-device registration
 closer to related code.


> The ioctl handler for the misc device is in  lnet/libcfs/module.c
> but is it registered in lnet/libcfs/linux/linux-module.c.
> 
> Keeping related code together make maintenance easier, so move the
> code.
> 
> Signed-off-by: NeilBrown <neilb@...e.com>

Reviewed-by: James Simmons <jsimmons@...radead.org>

> ---
>  .../staging/lustre/include/linux/libcfs/libcfs.h   |    2 -
>  .../lustre/lnet/libcfs/linux/linux-module.c        |   28 ------------------
>  drivers/staging/lustre/lnet/libcfs/module.c        |   31 +++++++++++++++++++-
>  3 files changed, 30 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs.h b/drivers/staging/lustre/include/linux/libcfs/libcfs.h
> index 6e7754b2f296..9263e151451b 100644
> --- a/drivers/staging/lustre/include/linux/libcfs/libcfs.h
> +++ b/drivers/staging/lustre/include/linux/libcfs/libcfs.h
> @@ -141,11 +141,9 @@ int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand);
>  int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr **hdr_pp,
>  			 const struct libcfs_ioctl_hdr __user *uparam);
>  int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data);
> -int libcfs_ioctl(unsigned long cmd, void __user *arg);
>  
>  #define _LIBCFS_H
>  
> -extern struct miscdevice libcfs_dev;
>  /**
>   * The path of debug log dump upcall script.
>   */
> diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
> index c8908e816c4c..954b681f9db7 100644
> --- a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
> +++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
> @@ -166,31 +166,3 @@ int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr **hdr_pp,
>  	kvfree(*hdr_pp);
>  	return err;
>  }
> -
> -static long
> -libcfs_psdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> -{
> -	if (!capable(CAP_SYS_ADMIN))
> -		return -EACCES;
> -
> -	if (_IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
> -	    _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR  ||
> -	    _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR) {
> -		CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
> -		       _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
> -		return -EINVAL;
> -	}
> -
> -	return libcfs_ioctl(cmd, (void __user *)arg);
> -}
> -
> -static const struct file_operations libcfs_fops = {
> -	.owner		= THIS_MODULE,
> -	.unlocked_ioctl	= libcfs_psdev_ioctl,
> -};
> -
> -struct miscdevice libcfs_dev = {
> -	.minor = MISC_DYNAMIC_MINOR,
> -	.name = "lnet",
> -	.fops = &libcfs_fops,
> -};
> diff --git a/drivers/staging/lustre/lnet/libcfs/module.c b/drivers/staging/lustre/lnet/libcfs/module.c
> index 4b9acd7bc5cf..3fb150a57f49 100644
> --- a/drivers/staging/lustre/lnet/libcfs/module.c
> +++ b/drivers/staging/lustre/lnet/libcfs/module.c
> @@ -95,7 +95,7 @@ int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand)
>  }
>  EXPORT_SYMBOL(libcfs_deregister_ioctl);
>  
> -int libcfs_ioctl(unsigned long cmd, void __user *uparam)
> +static int libcfs_ioctl(unsigned long cmd, void __user *uparam)
>  {
>  	struct libcfs_ioctl_data *data = NULL;
>  	struct libcfs_ioctl_hdr *hdr;
> @@ -161,6 +161,35 @@ int libcfs_ioctl(unsigned long cmd, void __user *uparam)
>  	return err;
>  }
>  
> +
> +static long
> +libcfs_psdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> +{
> +	if (!capable(CAP_SYS_ADMIN))
> +		return -EACCES;
> +
> +	if (_IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
> +	    _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR  ||
> +	    _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR) {
> +		CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
> +		       _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
> +		return -EINVAL;
> +	}
> +
> +	return libcfs_ioctl(cmd, (void __user *)arg);
> +}
> +
> +static const struct file_operations libcfs_fops = {
> +	.owner		= THIS_MODULE,
> +	.unlocked_ioctl	= libcfs_psdev_ioctl,
> +};
> +
> +struct miscdevice libcfs_dev = {
> +	.minor = MISC_DYNAMIC_MINOR,
> +	.name = "lnet",
> +	.fops = &libcfs_fops,
> +};
> +
>  int lprocfs_call_handler(void *data, int write, loff_t *ppos,
>  			 void __user *buffer, size_t *lenp,
>  			 int (*handler)(void *data, int write, loff_t pos,
> 
> 
>