fs: Convert __page_get_link() to use a folio

Retrieve a folio from the page cache instead of a page and operate
on it.  Removes two hidden calls to compound_head().

Signed-off-by: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Link: https://lore.kernel.org/20250514171316.3002934-2-willy@infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/namei.c b/fs/namei.c
index b051211f064c50bb6ed7b5e85c4f7c56ca1be035..7b76611d1a8c559d97c17ca35691dc185903db37 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -5371,25 +5371,25 @@ EXPORT_SYMBOL(vfs_get_link);
 static char *__page_get_link(struct dentry *dentry, struct inode *inode,
                             struct delayed_call *callback)
 {
-       struct page *page;
+       struct folio *folio;
        struct address_space *mapping = inode->i_mapping;
 
        if (!dentry) {
-               page = find_get_page(mapping, 0);
-               if (!page)
+               folio = filemap_get_folio(mapping, 0);
+               if (IS_ERR(folio))
                        return ERR_PTR(-ECHILD);
-               if (!PageUptodate(page)) {
-                       put_page(page);
+               if (!folio_test_uptodate(folio)) {
+                       folio_put(folio);
                        return ERR_PTR(-ECHILD);
                }
        } else {
-               page = read_mapping_page(mapping, 0, NULL);
-               if (IS_ERR(page))
-                       return (char*)page;
+               folio = read_mapping_folio(mapping, 0, NULL);
+               if (IS_ERR(folio))
+                       return ERR_CAST(folio);
        }
-       set_delayed_call(callback, page_put_link, page);
+       set_delayed_call(callback, page_put_link, &folio->page);
        BUG_ON(mapping_gfp_mask(mapping) & __GFP_HIGHMEM);
-       return page_address(page);
+       return folio_address(folio);
 }
 
 const char *page_get_link_raw(struct dentry *dentry, struct inode *inode,