[PATCH RFC v2 for-6.8/block 03/18] bcache: use bdev api in read_super()

Yu Kuai
2023-12-11T14:07:26Z

On the one hand covert to use folio while reading bdev inode, on the
other hand prevent to access bd_inode directly.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
drivers/md/bcache/super.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index bfe1685dbae5..23892b32c582 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -168,14 +168,13 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
{
const char *err;
struct cache_sb_disk *s;
- struct page *page;
+ struct folio *folio;
unsigned int i;

- page = read_cache_page_gfp(bdev->bd_inode->i_mapping,
- SB_OFFSET >> PAGE_SHIFT, GFP_KERNEL);
- if (IS_ERR(page))
+ folio = bdev_read_folio(bdev, SB_OFFSET);
+ if (IS_ERR(folio))
return "IO error";
- s = page_address(page) + offset_in_page(SB_OFFSET);
+ s = folio_address(folio) + offset_in_folio(folio, SB_OFFSET);

sb->offset = le64_to_cpu(s->offset);
sb->version = le64_to_cpu(s->version);
@@ -272,7 +271,7 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
*res = s;
return NULL;
err:
- put_page(page);
+ folio_put(folio);
return err;
}

--
2.39.2