Re: [dm-devel] [PATCH 09/19] btrfs: raid56: use __bio_add_page to add single page

[Damien Le Moal]

On 3/30/23 02:05, Johannes Thumshirn wrote:
> The btrfs raid58 sector submission code uses bio_add_page() to add a page
> to a newly created bio. bio_add_page() can fail, but the return value is
> never checked.
> 
> Use __bio_add_page() as adding a single page to a newly created bio is
> guaranteed to succeed.
> 
> This brings us a step closer to marking bio_add_page() as __must_check.
> 
> Signed-off-by: Johannes Thumshirn 

Reviewed-by: Damien Le Moal 

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Damien Le Moal
Western Digital Research

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[dm-devel] [PATCH 09/19] btrfs: raid56: use __bio_add_page to add single page

[Johannes Thumshirn]

The btrfs raid58 sector submission code uses bio_add_page() to add a page
to a newly created bio. bio_add_page() can fail, but the return value is
never checked.

Use __bio_add_page() as adding a single page to a newly created bio is
guaranteed to succeed.

This brings us a step closer to marking bio_add_page() as __must_check.

Signed-off-by: Johannes Thumshirn 
---
 fs/btrfs/raid56.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index 642828c1b299..c8173e003df6 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -1108,7 +1108,7 @@ static int rbio_add_io_sector(struct btrfs_raid_bio *rbio,
bio->bi_iter.bi_sector = disk_start >> 9;
bio->bi_private = rbio;
 
-   bio_add_page(bio, sector->page, sectorsize, sector->pgoff);
+   __bio_add_page(bio, sector->page, sectorsize, sector->pgoff);
bio_list_add(bio_list, bio);
return 0;
 }
-- 
2.39.2

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