linux-kernel - Re: [PATCH 1/6] f2fs: compress: fix to guarantee persisting compressed blocks by CP

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Date: Wed, 27 Dec 2023 09:04:48 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] f2fs: compress: fix to guarantee persisting
 compressed blocks by CP

On 2023/12/27 5:02, Jaegeuk Kim wrote:
> On 12/20, Chao Yu wrote:
>> If data block in compressed cluster is not persisted with metadata
>> during checkpoint, after SPOR, the data may be corrupted, let's
>> guarantee to write compressed page by checkpoint.
>>
>> Fixes: 4c8ff7095bef ("f2fs: support data compression")
>> Signed-off-by: Chao Yu <chao@...nel.org>
>> ---
>>   fs/f2fs/compress.c |  3 ++-
>>   fs/f2fs/data.c     | 12 +++++++++---
>>   fs/f2fs/f2fs.h     |  3 ++-
>>   3 files changed, 13 insertions(+), 5 deletions(-)
>>
>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
>> index 5b076329e9bf..1122db8cc0b0 100644
>> --- a/fs/f2fs/compress.c
>> +++ b/fs/f2fs/compress.c
>> @@ -1442,6 +1442,7 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
>>   	struct f2fs_sb_info *sbi = bio->bi_private;
>>   	struct compress_io_ctx *cic =
>>   			(struct compress_io_ctx *)page_private(page);
>> +	enum count_type type = WB_DATA_TYPE(page);
>>   	int i;
>>   
>>   	if (unlikely(bio->bi_status))
>> @@ -1449,7 +1450,7 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
>>   
>>   	f2fs_compress_free_page(page);
>>   
>> -	dec_page_count(sbi, F2FS_WB_DATA);
>> +	dec_page_count(sbi, type);
>>   
>>   	if (atomic_dec_return(&cic->pending_pages))
>>   		return;
>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> index d28c97282e68..6c72a6e86ba8 100644
>> --- a/fs/f2fs/data.c
>> +++ b/fs/f2fs/data.c
>> @@ -48,7 +48,7 @@ void f2fs_destroy_bioset(void)
>>   	bioset_exit(&f2fs_bioset);
>>   }
>>   
>> -static bool __is_cp_guaranteed(struct page *page)
>> +bool f2fs_is_cp_guaranteed(struct page *page)
>>   {
>>   	struct address_space *mapping = page->mapping;
>>   	struct inode *inode;
>> @@ -66,7 +66,7 @@ static bool __is_cp_guaranteed(struct page *page)
>>   		return true;
>>   
>>   	if (f2fs_is_compressed_page(page))
>> -		return false;
>> +		return true;
>>   	if ((S_ISREG(inode->i_mode) && IS_NOQUOTA(inode)) ||
>>   			page_private_gcing(page))
>>   		return true;
>> @@ -1007,6 +1007,7 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio)
>>   	enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
>>   	struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp;
>>   	struct page *bio_page;
>> +	enum count_type type;
>>   
>>   	f2fs_bug_on(sbi, is_read_io(fio->op));
>>   
>> @@ -1046,7 +1047,12 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio)
>>   	/* set submitted = true as a return value */
>>   	fio->submitted = 1;
>>   
>> -	inc_page_count(sbi, WB_DATA_TYPE(bio_page));
>> +	type = WB_DATA_TYPE(bio_page);
>> +	/* override count type if page is compressed one */
>> +	if (fio->compressed_page)
>> +		type = WB_DATA_TYPE(fio->compressed_page);
> 
> Doesn't bio_page already point fio->compressed_page?

Please check below codes, bio_page will point to fio->encrypted_page if
both software encryption feature and compression feature are on, for this
case, we still need to account F2FS_WB_CP_DATA.

	if (fio->encrypted_page)
		bio_page = fio->encrypted_page;
	else if (fio->compressed_page)
		bio_page = fio->compressed_page;
	else
		bio_page = fio->page;

Thanks,

> 
>> +
>> +	inc_page_count(sbi, type);
>>   
>>   	if (io->bio &&
>>   	    (!io_is_mergeable(sbi, io->bio, io, fio, io->last_block_in_bio,
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 76e9a8682e38..bcb3940ab5ba 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -1092,7 +1092,7 @@ struct f2fs_sm_info {
>>    * f2fs monitors the number of several block types such as on-writeback,
>>    * dirty dentry blocks, dirty node blocks, and dirty meta blocks.
>>    */
>> -#define WB_DATA_TYPE(p)	(__is_cp_guaranteed(p) ? F2FS_WB_CP_DATA : F2FS_WB_DATA)
>> +#define WB_DATA_TYPE(p)	(f2fs_is_cp_guaranteed(p) ? F2FS_WB_CP_DATA : F2FS_WB_DATA)
>>   enum count_type {
>>   	F2FS_DIRTY_DENTS,
>>   	F2FS_DIRTY_DATA,
>> @@ -3824,6 +3824,7 @@ void f2fs_init_ckpt_req_control(struct f2fs_sb_info *sbi);
>>    */
>>   int __init f2fs_init_bioset(void);
>>   void f2fs_destroy_bioset(void);
>> +bool f2fs_is_cp_guaranteed(struct page *page);
>>   int f2fs_init_bio_entry_cache(void);
>>   void f2fs_destroy_bio_entry_cache(void);
>>   void f2fs_submit_read_bio(struct f2fs_sb_info *sbi, struct bio *bio,
>> -- 
>> 2.40.1