linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: fix to return EIO when reading after device removal

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Message-ID: <23aa8351-e002-4185-89c7-ccde6b5b0549@kernel.org>
Date: Mon, 26 Feb 2024 16:00:17 +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
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix to return EIO when reading after
 device removal

Any comments?

Thanks,

On 2024/2/19 11:13, Chao Yu wrote:
> On 2024/2/8 8:18, Jaegeuk Kim wrote:
>> On 02/06, Chao Yu wrote:
>>> generic/730 2s ... - output mismatch (see /media/fstests/results//generic/730.out.bad)
>>>      --- tests/generic/730.out    2023-08-07 01:39:51.055568499 +0000
>>>      +++ /media/fstests/results//generic/730.out.bad    2024-02-06 02:26:43.000000000 +0000
>>>      @@ -1,2 +1 @@
>>>       QA output created by 730
>>>      -cat: -: Input/output error
>>>      ...
>>>      (Run 'diff -u /media/fstests/tests/generic/730.out /media/fstests/results//generic/730.out.bad'  to see the entire diff)
>>> Ran: generic/730
>>> Failures: generic/730
>>> Failed 1 of 1 tests
>>>
>>> This patch adds a check condition in f2fs_file_read_iter() to
>>> detect cp_error status after device removal, and retrurn -EIO
>>> for such case.
>>
>> Can we check device removal?
> 
> We can use blk_queue_dying() to detect device removal, but, IMO, device
> removal can almost not happen in Android, not sure for distros or server,
> do you want to add this check condition into f2fs_cp_error()?
> 
> Thanks,
> 
>>
>>>
>>> Signed-off-by: Chao Yu <chao@...nel.org>
>>> ---
>>>   fs/f2fs/file.c | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>>> index 45b7e3610b0f..9e4386d4144c 100644
>>> --- a/fs/f2fs/file.c
>>> +++ b/fs/f2fs/file.c
>>> @@ -4462,6 +4462,9 @@ static ssize_t f2fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
>>>       const loff_t pos = iocb->ki_pos;
>>>       ssize_t ret;
>>> +    if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
>>> +        return -EIO;
>>> +
>>>       if (!f2fs_is_compress_backend_ready(inode))
>>>           return -EOPNOTSUPP;
>>> -- 
>>> 2.40.1
> 
> 
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