linux-kernel - Re: [PATCH v2 9/9] dnotify: move dnotify sysctl to dnotify.c

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Date:   Wed, 24 Nov 2021 10:31:29 +0100
From:   Jan Kara <jack@...e.cz>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     akpm@...ux-foundation.org, keescook@...omium.org,
        yzaikin@...gle.com, nixiaoming@...wei.com, ebiederm@...ssion.com,
        peterz@...radead.org, gregkh@...uxfoundation.org, pjt@...gle.com,
        liu.hailong6@....com.cn, andriy.shevchenko@...ux.intel.com,
        sre@...nel.org, penguin-kernel@...ove.sakura.ne.jp,
        pmladek@...e.com, senozhatsky@...omium.org, wangqing@...o.com,
        bcrl@...ck.org, viro@...iv.linux.org.uk, jack@...e.cz,
        amir73il@...il.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 9/9] dnotify: move dnotify sysctl to dnotify.c

On Tue 23-11-21 12:23:47, Luis Chamberlain wrote:
> From: Xiaoming Ni <nixiaoming@...wei.com>
> 
> The kernel/sysctl.c is a kitchen sink where everyone leaves
> their dirty dishes, this makes it very difficult to maintain.
> 
> To help with this maintenance let's start by moving sysctls to
> places where they actually belong. The proc sysctl maintainers
> do not want to know what sysctl knobs you wish to add for your own
> piece of code, we just care about the core logic.
> 
> So move dnotify sysctls to dnotify.c and use the new
> register_sysctl_init() to register the sysctl interface.
> 
> Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>
> [mcgrof: adjust the commit log to justify the move]
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>

Looks sane. Feel free to add:

Acked-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/notify/dnotify/dnotify.c | 21 ++++++++++++++++++++-
>  include/linux/dnotify.h     |  1 -
>  kernel/sysctl.c             | 10 ----------
>  3 files changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
> index e85e13c50d6d..2b04e2296fb6 100644
> --- a/fs/notify/dnotify/dnotify.c
> +++ b/fs/notify/dnotify/dnotify.c
> @@ -19,7 +19,25 @@
>  #include <linux/fdtable.h>
>  #include <linux/fsnotify_backend.h>
>  
> -int dir_notify_enable __read_mostly = 1;
> +static int dir_notify_enable __read_mostly = 1;
> +#ifdef CONFIG_SYSCTL
> +static struct ctl_table dnotify_sysctls[] = {
> +	{
> +		.procname	= "dir-notify-enable",
> +		.data		= &dir_notify_enable,
> +		.maxlen		= sizeof(int),
> +		.mode		= 0644,
> +		.proc_handler	= proc_dointvec,
> +	},
> +	{}
> +};
> +static void __init dnotify_sysctl_init(void)
> +{
> +	register_sysctl_init("fs", dnotify_sysctls);
> +}
> +#else
> +#define dnotify_sysctl_init() do { } while (0)
> +#endif
>  
>  static struct kmem_cache *dnotify_struct_cache __read_mostly;
>  static struct kmem_cache *dnotify_mark_cache __read_mostly;
> @@ -386,6 +404,7 @@ static int __init dnotify_init(void)
>  	dnotify_group = fsnotify_alloc_group(&dnotify_fsnotify_ops);
>  	if (IS_ERR(dnotify_group))
>  		panic("unable to allocate fsnotify group for dnotify\n");
> +	dnotify_sysctl_init();
>  	return 0;
>  }
>  
> diff --git a/include/linux/dnotify.h b/include/linux/dnotify.h
> index 0aad774beaec..4f3b25d47436 100644
> --- a/include/linux/dnotify.h
> +++ b/include/linux/dnotify.h
> @@ -29,7 +29,6 @@ struct dnotify_struct {
>  			    FS_CREATE | FS_DN_RENAME |\
>  			    FS_MOVED_FROM | FS_MOVED_TO)
>  
> -extern int dir_notify_enable;
>  extern void dnotify_flush(struct file *, fl_owner_t);
>  extern int fcntl_dirnotify(int, struct file *, unsigned long);
>  
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 20326d67b814..7a90a12b9ea4 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -48,7 +48,6 @@
>  #include <linux/times.h>
>  #include <linux/limits.h>
>  #include <linux/dcache.h>
> -#include <linux/dnotify.h>
>  #include <linux/syscalls.h>
>  #include <linux/vmstat.h>
>  #include <linux/nfs_fs.h>
> @@ -3090,15 +3089,6 @@ static struct ctl_table fs_table[] = {
>  		.proc_handler	= proc_dointvec,
>  	},
>  #endif
> -#ifdef CONFIG_DNOTIFY
> -	{
> -		.procname	= "dir-notify-enable",
> -		.data		= &dir_notify_enable,
> -		.maxlen		= sizeof(int),
> -		.mode		= 0644,
> -		.proc_handler	= proc_dointvec,
> -	},
> -#endif
>  #ifdef CONFIG_MMU
>  #ifdef CONFIG_FILE_LOCKING
>  	{
> -- 
> 2.33.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR