afs: Convert invalidatepage to invalidate_folio

We know the page is in the page cache, not the swap cache.  If we ever
support folios larger than 2GB, afs_invalidate_dirty() will need to be
fixed, but that's a larger project.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs
Tested-by: David Howells <dhowells@redhat.com> # afs

fs/afs/file.c

@@ -21,8 +21,8 @@
 static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
 static int afs_readpage(struct file *file, struct page *page);
 static int afs_symlink_readpage(struct file *file, struct page *page);
-static void afs_invalidatepage(struct page *page, unsigned int offset,
-			       unsigned int length);
+static void afs_invalidate_folio(struct folio *folio, size_t offset,
+			       size_t length);
 static int afs_releasepage(struct page *page, gfp_t gfp_flags);
 
 static void afs_readahead(struct readahead_control *ractl);
@@ -57,7 +57,7 @@ const struct address_space_operations afs_file_aops = {
 	.set_page_dirty	= afs_set_page_dirty,
 	.launder_page	= afs_launder_page,
 	.releasepage	= afs_releasepage,
-	.invalidatepage	= afs_invalidatepage,
+	.invalidate_folio = afs_invalidate_folio,
 	.write_begin	= afs_write_begin,
 	.write_end	= afs_write_end,
 	.writepage	= afs_writepage,
@@ -67,7 +67,7 @@ const struct address_space_operations afs_file_aops = {
 const struct address_space_operations afs_symlink_aops = {
 	.readpage	= afs_symlink_readpage,
 	.releasepage	= afs_releasepage,
-	.invalidatepage	= afs_invalidatepage,
+	.invalidate_folio = afs_invalidate_folio,
 };
 
 static const struct vm_operations_struct afs_vm_ops = {
@@ -427,8 +427,8 @@ int afs_write_inode(struct inode *inode, struct writeback_control *wbc)
  * Adjust the dirty region of the page on truncation or full invalidation,
  * getting rid of the markers altogether if the region is entirely invalidated.
  */
-static void afs_invalidate_dirty(struct folio *folio, unsigned int offset,
-				 unsigned int length)
+static void afs_invalidate_dirty(struct folio *folio, size_t offset,
+				 size_t length)
 {
 	struct afs_vnode *vnode = AFS_FS_I(folio_inode(folio));
 	unsigned long priv;
@@ -485,16 +485,14 @@ static void afs_invalidate_dirty(struct folio *folio, unsigned int offset,
  * - release a page and clean up its private data if offset is 0 (indicating
  *   the entire page)
  */
-static void afs_invalidatepage(struct page *page, unsigned int offset,
-			       unsigned int length)
+static void afs_invalidate_folio(struct folio *folio, size_t offset,
+			       size_t length)
 {
-	struct folio *folio = page_folio(page);
-
-	_enter("{%lu},%u,%u", folio_index(folio), offset, length);
+	_enter("{%lu},%zu,%zu", folio->index, offset, length);
 
-	BUG_ON(!PageLocked(page));
+	BUG_ON(!folio_test_locked(folio));
 
-	if (PagePrivate(page))
+	if (folio_get_private(folio))
 		afs_invalidate_dirty(folio, offset, length);
 
 	folio_wait_fscache(folio);