Re: [f2fs-dev] [PATCH 1/9] f2fs: convert f2fs_compress_ctx_add_page() to use folio

[Chao Yu <chao@kernel.org>]

On 2024/8/14 6:24, Jaegeuk Kim wrote:
> Could you please test this series? I hit kernel hang along with refcount warning
> in f2fs_put_dic, when running fsstress. You can reproduce it quickly.

---
  fs/f2fs/data.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9e21cfe11cc7..4f4e76c33611 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2322,7 +2322,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
  			}
  		}

-		if (bio_add_folio(bio, folio, blocksize, 0) < blocksize)
+		if (!bio_add_folio(bio, folio, blocksize, 0))
  			goto submit_and_realloc;

  		ctx = get_post_read_ctx(bio);
-- 
2.40.1

After applying this, it doesn't complain now.

Thanks,

> 
> On 08/13, Chao Yu wrote:
>> onvert to use folio, so that we can get rid of 'page->index' to
>> prepare for removal of 'index' field in structure page [1].
>>
>> [1] https://lore.kernel.org/all/Zp8fgUSIBGQ1TN0D@casper.infradead.org/
>>
>> Cc: Matthew Wilcox <willy@infradead.org>
>> Signed-off-by: Chao Yu <chao@kernel.org>
>> ---
>>   fs/f2fs/compress.c | 14 +++++++-------
>>   fs/f2fs/data.c     |  4 ++--
>>   fs/f2fs/f2fs.h     |  2 +-
>>   3 files changed, 10 insertions(+), 10 deletions(-)
>>
>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
>> index 990b93689b46..eb5cd1457ffc 100644
>> --- a/fs/f2fs/compress.c
>> +++ b/fs/f2fs/compress.c
>> @@ -160,17 +160,17 @@ void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
>>   		cc->cluster_idx = NULL_CLUSTER;
>>   }
>>   
>> -void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
>> +void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct folio *folio)
>>   {
>>   	unsigned int cluster_ofs;
>>   
>> -	if (!f2fs_cluster_can_merge_page(cc, page->index))
>> +	if (!f2fs_cluster_can_merge_page(cc, folio->index))
>>   		f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
>>   
>> -	cluster_ofs = offset_in_cluster(cc, page->index);
>> -	cc->rpages[cluster_ofs] = page;
>> +	cluster_ofs = offset_in_cluster(cc, folio->index);
>> +	cc->rpages[cluster_ofs] = folio_page(folio, 0);
>>   	cc->nr_rpages++;
>> -	cc->cluster_idx = cluster_idx(cc, page->index);
>> +	cc->cluster_idx = cluster_idx(cc, folio->index);
>>   }
>>   
>>   #ifdef CONFIG_F2FS_FS_LZO
>> @@ -1093,7 +1093,7 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
>>   		if (PageUptodate(page))
>>   			f2fs_put_page(page, 1);
>>   		else
>> -			f2fs_compress_ctx_add_page(cc, page);
>> +			f2fs_compress_ctx_add_page(cc, page_folio(page));
>>   	}
>>   
>>   	if (!f2fs_cluster_is_empty(cc)) {
>> @@ -1123,7 +1123,7 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
>>   		}
>>   
>>   		f2fs_wait_on_page_writeback(page, DATA, true, true);
>> -		f2fs_compress_ctx_add_page(cc, page);
>> +		f2fs_compress_ctx_add_page(cc, page_folio(page));
>>   
>>   		if (!PageUptodate(page)) {
>>   release_and_retry:
>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> index e9570f4e0f21..100b6526717f 100644
>> --- a/fs/f2fs/data.c
>> +++ b/fs/f2fs/data.c
>> @@ -2429,7 +2429,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
>>   		if (ret)
>>   			goto set_error_page;
>>   
>> -		f2fs_compress_ctx_add_page(&cc, &folio->page);
>> +		f2fs_compress_ctx_add_page(&cc, folio);
>>   
>>   		goto next_page;
>>   read_single_page:
>> @@ -3161,7 +3161,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
>>   #ifdef CONFIG_F2FS_FS_COMPRESSION
>>   			if (f2fs_compressed_file(inode)) {
>>   				folio_get(folio);
>> -				f2fs_compress_ctx_add_page(&cc, &folio->page);
>> +				f2fs_compress_ctx_add_page(&cc, folio);
>>   				continue;
>>   			}
>>   #endif
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 51fd5063a69c..df436dd3aac1 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -4322,7 +4322,7 @@ bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index);
>>   bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
>>   				int index, int nr_pages, bool uptodate);
>>   bool f2fs_sanity_check_cluster(struct dnode_of_data *dn);
>> -void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page);
>> +void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct folio *folio);
>>   int f2fs_write_multi_pages(struct compress_ctx *cc,
>>   						int *submitted,
>>   						struct writeback_control *wbc,
>> -- 
>> 2.40.1



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