buffer: convert link_dev_buffers to take a folio

Its one caller already has a folio, so switch it to use the folio API.
Removes a hidden call to compound_head().

Link: https://lkml.kernel.org/r/20230612210141.730128-13-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Bob Peterson <rpeterso@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/buffer.c b/fs/buffer.c
index 9b9dee4..4ca2eb2 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -907,8 +907,8 @@ struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
 }
 EXPORT_SYMBOL_GPL(alloc_page_buffers);
 
-static inline void
-link_dev_buffers(struct page *page, struct buffer_head *head)
+static inline void link_dev_buffers(struct folio *folio,
+               struct buffer_head *head)
 {
        struct buffer_head *bh, *tail;
 
@@ -918,7 +918,7 @@ link_dev_buffers(struct page *page, struct buffer_head *head)
                bh = bh->b_this_page;
        } while (bh);
        tail->b_this_page = head;
-       attach_page_private(page, head);
+       folio_attach_private(folio, head);
 }
 
 static sector_t blkdev_max_block(struct block_device *bdev, unsigned int size)
@@ -1013,7 +1013,7 @@ grow_dev_page(struct block_device *bdev, sector_t block,
         * run under the folio lock.
         */
        spin_lock(&inode->i_mapping->private_lock);
-       link_dev_buffers(&folio->page, bh);
+       link_dev_buffers(folio, bh);
        end_block = folio_init_buffers(folio, bdev,
                        (sector_t)index << sizebits, size);
        spin_unlock(&inode->i_mapping->private_lock);