linux-kernel - Re: [f2fs-dev] [PATCH v2] f2fs: retry to update the inode page given EIO

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Date:   Sat, 28 Jan 2023 11:11:43 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, stable@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: retry to update the inode page given
 EIO

On 2023/1/13 8:01, Jaegeuk Kim wrote:
> On 01/12, Chao Yu wrote:
>> On 2023/1/12 2:50, Jaegeuk Kim wrote:
>>> On 01/11, Chao Yu wrote:
>>>> On 2023/1/11 9:20, Jaegeuk Kim wrote:
>>>>> In f2fs_update_inode_page, f2fs_get_node_page handles EIO along with
>>>>> f2fs_handle_page_eio that stops checkpoint, if the disk couldn't be recovered.
>>>>> As a result, we don't need to stop checkpoint right away given single EIO.
>>>>
>>>> f2fs_handle_page_eio() only covers the case that EIO occurs on the same
>>>> page, should we cover the case EIO occurs on different pages?
>>>
>>> Which case are you looking at?
>>
>> - __get_node_page(PageA)		- __get_node_page(PageB)
>>   - f2fs_handle_page_eio
>>    - sbi->page_eio_ofs[type] = PageA->index
>> 					 - f2fs_handle_page_eio
>> 					  - sbi->page_eio_ofs[type] = PageB->index
>>
>> In such race case, it may has low probability to set CP_ERROR_FLAG as we expect?
> 
> Do you see that case in products?

Not yet.

> I'm trying to avoid setting CP_ERROR_FLAG here.

Copied, how about using the same logic for node page as meta page, like
we did in f2fs_get_meta_page_retry()?

Thanks,

> 
>>
>> Thanks,
>>
>>>
>>>>
>>>> Thanks,
>>>>
>>>>>
>>>>> Cc: stable@...r.kernel.org
>>>>> Signed-off-by: Randall Huang <huangrandall@...gle.com>
>>>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>>>> ---
>>>>>
>>>>>     Change log from v1:
>>>>>      - fix a bug
>>>>>
>>>>>     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 ff6cf66ed46b..2ed7a621fdf1 100644
>>>>> --- a/fs/f2fs/inode.c
>>>>> +++ b/fs/f2fs/inode.c
>>>>> @@ -719,7 +719,7 @@ void f2fs_update_inode_page(struct inode *inode)
>>>>>     	if (IS_ERR(node_page)) {
>>>>>     		int err = PTR_ERR(node_page);
>>>>> -		if (err == -ENOMEM) {
>>>>> +		if (err == -ENOMEM || (err == -EIO && !f2fs_cp_error(sbi))) {
>>>>>     			cond_resched();
>>>>>     			goto retry;
>>>>>     		} else if (err != -ENOENT) {