linux-kernel - Re: [PATCH v2 3/9] mm/page_io: convert bio_first_page_all() to bio_first_folio

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Message-ID: <2f844f7f-f671-f046-03e3-4e7d28cdcbc2@huawei.com>
Date:   Thu, 20 Jul 2023 17:31:39 +0800
From:   "zhangpeng (AS)" <zhangpeng362@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <sidhartha.kumar@...cle.com>, <akpm@...ux-foundation.org>,
        <wangkefeng.wang@...wei.com>, <sunnanyong@...wei.com>
Subject: Re: [PATCH v2 3/9] mm/page_io: convert bio_first_page_all() to
 bio_first_folio_all()

On 2023/7/19 22:17, Matthew Wilcox wrote:

> On Wed, Jul 19, 2023 at 05:58:42PM +0800, Peng Zhang wrote:
>> From: ZhangPeng<zhangpeng362@...wei.com>
>>
>> Convert bio_first_page_all() to bio_first_folio_all() to return a
>> folio, which makes it easier to use.
> This wasn't what I was suggesting.  Indeed, this may introduce bugs.
> I was suggesting adding bio_first_folio_all() so that it can be used
> by code that knows this is what it wants.

Sorry for my misunderstanding, I will fix it in the next version.

>> Suggested-by: Matthew Wilcox (Oracle)<willy@...radead.org>
>> Signed-off-by: ZhangPeng<zhangpeng362@...wei.com>
>> ---
>>   Documentation/block/biovecs.rst  | 2 +-
>>   drivers/block/drbd/drbd_bitmap.c | 2 +-
>>   fs/f2fs/data.c                   | 2 +-
>>   include/linux/bio.h              | 4 ++--
>>   kernel/power/swap.c              | 2 +-
>>   mm/page_io.c                     | 4 ++--
>>   6 files changed, 8 insertions(+), 8 deletions(-)
>>
>> diff --git a/Documentation/block/biovecs.rst b/Documentation/block/biovecs.rst
>> index ddb867e0185b..258f6faed333 100644
>> --- a/Documentation/block/biovecs.rst
>> +++ b/Documentation/block/biovecs.rst
>> @@ -133,7 +133,7 @@ Usage of helpers:
>>   	bio_for_each_segment_all()
>>   	bio_for_each_bvec_all()
>>   	bio_first_bvec_all()
>> -	bio_first_page_all()
>> +	bio_first_folio_all()
>>   	bio_last_bvec_all()
>>   
>>   * The following helpers iterate over single-page segment. The passed 'struct
>> diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
>> index 85ca000a0564..ce1a07ba85ff 100644
>> --- a/drivers/block/drbd/drbd_bitmap.c
>> +++ b/drivers/block/drbd/drbd_bitmap.c
>> @@ -939,7 +939,7 @@ static void drbd_bm_endio(struct bio *bio)
>>   	struct drbd_bm_aio_ctx *ctx = bio->bi_private;
>>   	struct drbd_device *device = ctx->device;
>>   	struct drbd_bitmap *b = device->bitmap;
>> -	unsigned int idx = bm_page_to_idx(bio_first_page_all(bio));
>> +	unsigned int idx = bm_page_to_idx(&bio_first_folio_all(bio)->page);
>>   
>>   	if ((ctx->flags & BM_AIO_COPY_PAGES) == 0 &&
>>   	    !bm_test_page_unchanged(b->bm_pages[idx]))
>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> index 5882afe71d82..6706858de984 100644
>> --- a/fs/f2fs/data.c
>> +++ b/fs/f2fs/data.c
>> @@ -288,7 +288,7 @@ static void f2fs_post_read_work(struct work_struct *work)
>>   
>>   static void f2fs_read_end_io(struct bio *bio)
>>   {
>> -	struct f2fs_sb_info *sbi = F2FS_P_SB(bio_first_page_all(bio));
>> +	struct f2fs_sb_info *sbi = F2FS_P_SB(&bio_first_folio_all(bio)->page);
>>   	struct bio_post_read_ctx *ctx;
>>   	bool intask = in_task();
>>   
>> diff --git a/include/linux/bio.h b/include/linux/bio.h
>> index c4f5b5228105..7d2979d24530 100644
>> --- a/include/linux/bio.h
>> +++ b/include/linux/bio.h
>> @@ -248,9 +248,9 @@ static inline struct bio_vec *bio_first_bvec_all(struct bio *bio)
>>   	return bio->bi_io_vec;
>>   }
>>   
>> -static inline struct page *bio_first_page_all(struct bio *bio)
>> +static inline struct folio *bio_first_folio_all(struct bio *bio)
>>   {
>> -	return bio_first_bvec_all(bio)->bv_page;
>> +	return page_folio(bio_first_bvec_all(bio)->bv_page);
>>   }
>>   
>>   static inline struct bio_vec *bio_last_bvec_all(struct bio *bio)
>> diff --git a/kernel/power/swap.c b/kernel/power/swap.c
>> index f6ebcd00c410..2796ce48ca4b 100644
>> --- a/kernel/power/swap.c
>> +++ b/kernel/power/swap.c
>> @@ -247,7 +247,7 @@ static void hib_finish_batch(struct hib_bio_batch *hb)
>>   static void hib_end_io(struct bio *bio)
>>   {
>>   	struct hib_bio_batch *hb = bio->bi_private;
>> -	struct page *page = bio_first_page_all(bio);
>> +	struct page *page = &bio_first_folio_all(bio)->page;
>>   
>>   	if (bio->bi_status) {
>>   		pr_alert("Read-error on swap-device (%u:%u:%Lu)\n",
>> diff --git a/mm/page_io.c b/mm/page_io.c
>> index 5ddb5d9c5013..e21d570c873d 100644
>> --- a/mm/page_io.c
>> +++ b/mm/page_io.c
>> @@ -29,7 +29,7 @@
>>   
>>   static void __end_swap_bio_write(struct bio *bio)
>>   {
>> -	struct page *page = bio_first_page_all(bio);
>> +	struct page *page = &bio_first_folio_all(bio)->page;
>>   
>>   	if (bio->bi_status) {
>>   		/*
>> @@ -57,7 +57,7 @@ static void end_swap_bio_write(struct bio *bio)
>>   
>>   static void __end_swap_bio_read(struct bio *bio)
>>   {
>> -	struct page *page = bio_first_page_all(bio);
>> +	struct page *page = &bio_first_folio_all(bio)->page;
>>   
>>   	if (bio->bi_status) {
>>   		pr_alert_ratelimited("Read-error on swap-device (%u:%u:%llu)\n",
>> -- 
>> 2.25.1
>>
-- 
Best Regards,
Peng