truncate,shmem: Add truncate_inode_folio()

Convert all callers of truncate_inode_page() to call
truncate_inode_folio() instead, and move the declaration to mm/internal.h.
Move the assertion that the caller is not passing in a tail page to
generic_error_remove_page().  We can't entirely remove the struct page
from the callers yet because the page pointer in the pvec might be a
shadow/dax/swap entry instead of actually a page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/mm/shmem.c b/mm/shmem.c
index 40da9075374b..dbef008fb6e5 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -950,7 +950,7 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
 			index += folio_nr_pages(folio) - 1;
 
 			if (!unfalloc || !folio_test_uptodate(folio))
-				truncate_inode_page(mapping, &folio->page);
+				truncate_inode_folio(mapping, folio);
 			folio_unlock(folio);
 		}
 		pagevec_remove_exceptionals(&pvec);
@@ -1027,7 +1027,8 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
 				}
 				VM_BUG_ON_PAGE(PageWriteback(page), page);
 				if (shmem_punch_compound(page, start, end))
-					truncate_inode_page(mapping, page);
+					truncate_inode_folio(mapping,
+							     page_folio(page));
 				else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
 					/* Wipe the page and don't get stuck */
 					clear_highpage(page);