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SubjectRe: [f2fs-dev] [PATCH v3] f2fs: avoid inifinite loop to wait for flushing node pages at cp_error
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On 2020/5/26 9:11, Chao Yu wrote:
> On 2020/5/25 23:06, Jaegeuk Kim wrote:
>> On 05/25, Chao Yu wrote:
>>> On 2020/5/25 11:56, Jaegeuk Kim wrote:
>>>> Shutdown test is somtimes hung, since it keeps trying to flush dirty node pages
>>>
>>> IMO, for umount case, we should drop dirty reference and dirty pages on meta/data
>>> pages like we change for node pages to avoid potential dead loop...
>>
>> I believe we're doing for them. :P
>
> Actually, I mean do we need to drop dirty meta/data pages explicitly as below:
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 3dc3ac6fe143..4c08fd0a680a 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -299,8 +299,15 @@ static int __f2fs_write_meta_page(struct page *page,
>
> trace_f2fs_writepage(page, META);
>
> - if (unlikely(f2fs_cp_error(sbi)))
> + if (unlikely(f2fs_cp_error(sbi))) {
> + if (is_sbi_flag_set(sbi, SBI_IS_CLOSE)) {
> + ClearPageUptodate(page);
> + dec_page_count(sbi, F2FS_DIRTY_META);
> + unlock_page(page);
> + return 0;
> + }
> goto redirty_out;
> + }
> if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
> goto redirty_out;
> if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 48a622b95b76..94b342802513 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2682,6 +2682,12 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
>
> /* we should bypass data pages to proceed the kworkder jobs */
> if (unlikely(f2fs_cp_error(sbi))) {
> + if (is_sbi_flag_set(sbi, SBI_IS_CLOSE)) {
> + ClearPageUptodate(page);
> + inode_dec_dirty_pages(inode);
> + unlock_page(page);
> + return 0;
> + }

Oh, I notice previously, we will drop non-directory inode's dirty pages directly,
however, during umount, we'd better drop directory inode's dirty pages as well, right?

> mapping_set_error(page->mapping, -EIO);
> /*
> * don't drop any dirty dentry pages for keeping lastest
>
>>
>>>
>>> Thanks,
>>>
>>>> in an inifinite loop. Let's drop dirty pages at umount in that case.
>>>>
>>>> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
>>>> ---
>>>> v3:
>>>> - fix wrong unlock
>>>>
>>>> v2:
>>>> - fix typos
>>>>
>>>> fs/f2fs/node.c | 9 ++++++++-
>>>> 1 file changed, 8 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
>>>> index e632de10aedab..e0bb0f7e0506e 100644
>>>> --- a/fs/f2fs/node.c
>>>> +++ b/fs/f2fs/node.c
>>>> @@ -1520,8 +1520,15 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
>>>>
>>>> trace_f2fs_writepage(page, NODE);
>>>>
>>>> - if (unlikely(f2fs_cp_error(sbi)))
>>>> + if (unlikely(f2fs_cp_error(sbi))) {
>>>> + if (is_sbi_flag_set(sbi, SBI_IS_CLOSE)) {
>>>> + ClearPageUptodate(page);
>>>> + dec_page_count(sbi, F2FS_DIRTY_NODES);
>>>> + unlock_page(page);
>>>> + return 0;
>>>> + }
>>>> goto redirty_out;
>>>> + }
>>>>
>>>> if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
>>>> goto redirty_out;
>>>>
>> .
>>
>
>
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> Linux-f2fs-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> .
>

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