linux-kernel - Re: [Linux-cachefs] [PATCH] fscache: Move fscache_cookies_seq_ops specific code under CONFIG_PROC

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Date:   Wed, 6 Apr 2022 10:51:08 +0800
From:   JeffleXu <jefflexu@...ux.alibaba.com>
To:     Yue Hu <huyue2@...lpad.com>, dhowells@...hat.com,
        linux-cachefs@...hat.com
Cc:     zbestahu@...il.com, linux-kernel@...r.kernel.org, zbestahu@....com
Subject: Re: [Linux-cachefs] [PATCH] fscache: Move fscache_cookies_seq_ops
 specific code under CONFIG_PROC_FS



On 4/6/22 10:45 AM, JeffleXu wrote:
> 
> 
> On 4/2/22 12:47 PM, Yue Hu wrote:
>> fscache_cookies_seq_ops is only used in proc.c that is compiled under
>> enabled CONFIG_PROC_FS, so move related code under this config. The
>> same case exsits in internal.h.
>>
>> Also, make fscache_lru_cookie_timeout static due to no user outside
>> of cookie.c.
>>
>> Signed-off-by: Yue Hu <huyue2@...lpad.com>
>> ---
>>  fs/fscache/cookie.c   | 4 +++-
>>  fs/fscache/internal.h | 4 ++++
>>  2 files changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
>> index 9bb1ab5fe5ed..9d3cf0111709 100644
>> --- a/fs/fscache/cookie.c
>> +++ b/fs/fscache/cookie.c
>> @@ -30,7 +30,7 @@ static DEFINE_SPINLOCK(fscache_cookie_lru_lock);
>>  DEFINE_TIMER(fscache_cookie_lru_timer, fscache_cookie_lru_timed_out);
>>  static DECLARE_WORK(fscache_cookie_lru_work, fscache_cookie_lru_worker);
>>  static const char fscache_cookie_states[FSCACHE_COOKIE_STATE__NR] = "-LCAIFUWRD";
>> -unsigned int fscache_lru_cookie_timeout = 10 * HZ;
>> +static unsigned int fscache_lru_cookie_timeout = 10 * HZ;
>>  
>>  void fscache_print_cookie(struct fscache_cookie *cookie, char prefix)
>>  {
>> @@ -1069,6 +1069,7 @@ void __fscache_invalidate(struct fscache_cookie *cookie,
>>  }
>>  EXPORT_SYMBOL(__fscache_invalidate);
>>  
>> +#ifdef CONFIG_PROC_FS
>>  /*
>>   * Generate a list of extant cookies in /proc/fs/fscache/cookies
>>   */
>> @@ -1145,3 +1146,4 @@ const struct seq_operations fscache_cookies_seq_ops = {
>>  	.stop   = fscache_cookies_seq_stop,
>>  	.show   = fscache_cookies_seq_show,
>>  };
>> +#endif
> 
> Then I'm afraid fscache_cookies_seq_stop() and
> fscache_cookies_seq_show() also need to be wrapped with "#ifdef
> CONFIG_PROC_F" ...
> 

Sorry, fscache_cookies_seq_stop() and fscache_cookies_seq_show() have
already been wrapped with "#ifdef CONFIG_PROC_F" in this patch. Please
ignore the noise...

-- 
Thanks,
Jeffle