linux-kernel - Re: [PATCH 1/3] res_counter: introduce res_counter_write

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Date:	Tue, 11 Mar 2008 19:21:17 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Paul Menage <menage@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH 1/3] res_counter: introduce res_counter_write_u64()

On Tue, 11 Mar 2008 19:08:39 +0900
Li Zefan <lizf@...fujitsu.com> wrote:

> This function can be used to assign the value of a resource counter member.
> 
Why don't you make this function to do the same work as res_counter_write() ?

Thanks,
-Kame


> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> ---
>  include/linux/res_counter.h |    9 ++++++---
>  kernel/res_counter.c        |    9 +++++++++
>  2 files changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
> index 8cb1ecd..8c23f7f 100644
> --- a/include/linux/res_counter.h
> +++ b/include/linux/res_counter.h
> @@ -41,9 +41,10 @@ struct res_counter {
>  
>  /**
>   * Helpers to interact with userspace
> - * res_counter_read_u64() - returns the value of the specified member.
> - * res_counter_read/_write - put/get the specified fields from the
> - * res_counter struct to/from the user
> + * res_counter_read_64/_write_u64 - returns/assigns the value of the
> + *	specified member
> + * res_counter_read/_write - puts/gets the specified fields from the
> + *	res_counter struct to/from the user
>   *
>   * @counter:     the counter in question
>   * @member:  the field to work with (see RES_xxx below)
> @@ -53,6 +54,8 @@ struct res_counter {
>   */
>  
>  u64 res_counter_read_u64(struct res_counter *counter, int member);
> +void res_counter_write_u64(struct res_counter *counter, int member,
> +			   unsigned long long val);
>  
>  ssize_t res_counter_read(struct res_counter *counter, int member,
>  		const char __user *buf, size_t nbytes, loff_t *pos,
> diff --git a/kernel/res_counter.c b/kernel/res_counter.c
> index 791ff2b..a16b727 100644
> --- a/kernel/res_counter.c
> +++ b/kernel/res_counter.c
> @@ -97,6 +97,15 @@ u64 res_counter_read_u64(struct res_counter *counter, int member)
>  	return *res_counter_member(counter, member);
>  }
>  
> +void res_counter_write_u64(struct res_counter *counter, int member,
> +			   unsigned long long val)
> +{
> +	unsigned long long *tmp;
> +
> +	tmp = res_counter_member(counter, member);
> +	*tmp = val;
> +}
> +
>  ssize_t res_counter_write(struct res_counter *counter, int member,
>  		const char __user *userbuf, size_t nbytes, loff_t *pos,
>  		int (*write_strategy)(char *st_buf, unsigned long long *val))
> -- 
> 1.5.4.rc3
> 
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