splice: Use a folio in page_cache_pipe_buf_try_steal()

This saves a lot of calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>

diff --git a/fs/splice.c b/fs/splice.c
index 5dbce4d..23ff9c3 100644 (file)
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -47,26 +47,27 @@ static bool page_cache_pipe_buf_try_steal(struct pipe_inode_info *pipe,
                struct pipe_buffer *buf)
 {
        struct page *page = buf->page;
+       struct folio *folio = page_folio(page);
        struct address_space *mapping;
 
-       lock_page(page);
+       folio_lock(folio);
 
-       mapping = page_mapping(page);
+       mapping = folio_mapping(folio);
        if (mapping) {
-               WARN_ON(!PageUptodate(page));
+               WARN_ON(!folio_test_uptodate(folio));
 
                /*
                 * At least for ext2 with nobh option, we need to wait on
-                * writeback completing on this page, since we'll remove it
+                * writeback completing on this folio, since we'll remove it
                 * from the pagecache.  Otherwise truncate wont wait on the
-                * page, allowing the disk blocks to be reused by someone else
+                * folio, allowing the disk blocks to be reused by someone else
                 * before we actually wrote our data to them. fs corruption
                 * ensues.
                 */
-               wait_on_page_writeback(page);
+               folio_wait_writeback(folio);
 
-               if (page_has_private(page) &&
-                   !try_to_release_page(page, GFP_KERNEL))
+               if (folio_has_private(folio) &&
+                   !filemap_release_folio(folio, GFP_KERNEL))
                        goto out_unlock;
 
                /*
@@ -80,11 +81,11 @@ static bool page_cache_pipe_buf_try_steal(struct pipe_inode_info *pipe,
        }
 
        /*
-        * Raced with truncate or failed to remove page from current
+        * Raced with truncate or failed to remove folio from current
         * address space, unlock and return failure.
         */
 out_unlock:
-       unlock_page(page);
+       folio_unlock(folio);
        return false;
 }