[PATCH] fault-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops

[PATCH] fault-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops

[zhong jiang]

It is more clear to use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs file
operation rather than DEFINE_SIMPLE_ATTRIBUTE.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 lib/fault-inject.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index 8186ca8..4e61326 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -164,7 +164,7 @@ static int debugfs_ul_get(void *data, u64 *val)
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
 
 static void debugfs_create_ul(const char *name, umode_t mode,
 			      struct dentry *parent, unsigned long *value)
@@ -182,7 +182,7 @@ static int debugfs_stacktrace_depth_set(void *data, u64 val)
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(fops_stacktrace_depth, debugfs_ul_get,
+DEFINE_DEBUGFS_ATTRIBUTE(fops_stacktrace_depth, debugfs_ul_get,
 			debugfs_stacktrace_depth_set, "%llu\n");
 
 static void debugfs_create_stacktrace_depth(const char *name, umode_t mode,
-- 
1.7.12.4

Re: [PATCH] fault-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops

[Greg KH]

On Wed, Oct 30, 2019 at 04:22:36PM +0800, zhong jiang wrote:
> It is more clear to use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs file
> operation rather than DEFINE_SIMPLE_ATTRIBUTE.

Why does this matter?  What does this change?  You are changing how some
of the file reference counting works now, are you sure this is ok?

thanks,

greg k-h

Re: [PATCH] fault-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops

[zhong jiang]

On 2019/10/30 17:10, Greg KH wrote:
> On Wed, Oct 30, 2019 at 04:22:36PM +0800, zhong jiang wrote:
>> It is more clear to use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs file
>> operation rather than DEFINE_SIMPLE_ATTRIBUTE.
> Why does this matter?  What does this change?  You are changing how some
> of the file reference counting works now, are you sure this is ok?
I think that it is more correct to use DEFINE_DEBUGFS_ATTRIBUTE(), since they are debugfs attrs.
It is designed and defined for debugfs fops.  

Of course,  Use DEFINE_SIMPLE_ATTRIBUTE here  to define debugfs attrs is feasible  functionally.

Thanks,
zhong jiang
> thanks,
>
> greg k-h
>
> .
>

Re: [PATCH] fault-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops

[Akinobu Mita]

2019年10月30日(水) 17:26 zhong jiang <zhongjiang@huawei.com>:
>
> It is more clear to use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs file
> operation rather than DEFINE_SIMPLE_ATTRIBUTE.
>
> Signed-off-by: zhong jiang <zhongjiang@huawei.com>
> ---
>  lib/fault-inject.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/fault-inject.c b/lib/fault-inject.c
> index 8186ca8..4e61326 100644
> --- a/lib/fault-inject.c
> +++ b/lib/fault-inject.c
> @@ -164,7 +164,7 @@ static int debugfs_ul_get(void *data, u64 *val)
>         return 0;
>  }
>
> -DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
> +DEFINE_DEBUGFS_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
>
>  static void debugfs_create_ul(const char *name, umode_t mode,
>                               struct dentry *parent, unsigned long *value)

Nowadays we have debugfs_create_ulong(), so should we use it instead of
debugfs_create_ul() defined in this file and remove the definision
altogether?

Re: [PATCH] fault-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops

[zhong jiang]

On 2019/10/30 18:29, Akinobu Mita wrote:
> 2019年10月30日(水) 17:26 zhong jiang <zhongjiang@huawei.com>:
>> It is more clear to use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs file
>> operation rather than DEFINE_SIMPLE_ATTRIBUTE.
>>
>> Signed-off-by: zhong jiang <zhongjiang@huawei.com>
>> ---
>>  lib/fault-inject.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/lib/fault-inject.c b/lib/fault-inject.c
>> index 8186ca8..4e61326 100644
>> --- a/lib/fault-inject.c
>> +++ b/lib/fault-inject.c
>> @@ -164,7 +164,7 @@ static int debugfs_ul_get(void *data, u64 *val)
>>         return 0;
>>  }
>>
>> -DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
>> +DEFINE_DEBUGFS_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
>>
>>  static void debugfs_create_ul(const char *name, umode_t mode,
>>                               struct dentry *parent, unsigned long *value)
> Nowadays we have debugfs_create_ulong(), so should we use it instead of
> debugfs_create_ul() defined in this file and remove the definision
> altogether?
>
> .
yes, you are right. That is better. I will repost in v2. Thanks

Sincerely,
zhong jiang
>