linux-kernel - Re: [f2fs-dev] [PATCH 1/1] f2fs: pass I

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Date:   Wed, 17 May 2023 22:31:21 +0800
From:   Wu Bo <wubo.oduw@...il.com>
To:     Chao Yu <chao@...nel.org>, Wu Bo <bo.wu@...o.com>
Cc:     jaegeuk@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH 1/1] f2fs: pass I_NEW flag to trace event

On 2023/5/17 16:36, Chao Yu wrote:
> On 2023/5/17 11:59, Wu Bo wrote:
>> On 2023/5/17 10:44, Chao Yu wrote:
>>> On 2023/5/16 20:07, Wu Bo wrote:
>>>> Modify the order between 'trace_f2fs_iget' & 'unlock_new_inode', so 
>>>> the
>>>> I_NEW can pass to the trace event when the inode initialised.
>>>
>>> Why is it needed? And trace_f2fs_iget() won't print inode->i_state?
>>
>> When connect a trace_probe to f2fs_iget, it will be able to determine 
>> whether
>> the inode is new initialised in order to do different process.
>
> I didn't get it, you want to hook __tracepoint_f2fs_iget() w/ your own 
> callback?
Yes,  to use 'tracepoint_probe_register ' to register a probe at 
trace_f2fs_iget
>
> Thanks,
>
>>
>>>
>>> Thanks,
>>>
>>>>
>>>> Signed-off-by: Wu Bo <bo.wu@...o.com>
>>>> ---
>>>>    fs/f2fs/inode.c | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
>>>> index cf4327ad106c..caf959289fe7 100644
>>>> --- a/fs/f2fs/inode.c
>>>> +++ b/fs/f2fs/inode.c
>>>> @@ -577,8 +577,8 @@ struct inode *f2fs_iget(struct super_block *sb,
>>>> unsigned long ino)
>>>>            file_dont_truncate(inode);
>>>>        }
>>>>    -    unlock_new_inode(inode);
>>>>        trace_f2fs_iget(inode);
>>>> +    unlock_new_inode(inode);
>>>>        return inode;
>>>>      bad_inode:
>>>
>>>
>>> _______________________________________________
>>> Linux-f2fs-devel mailing list
>>> Linux-f2fs-devel@...ts.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>>>