fs/ntfs3: return folios from ntfs_lock_new_page()

ntfs_lock_new_page() currently returns a struct page * but it primarily
operates on folios via __filemap_get_folio(). Convert it to return a
struct folio * and use folio_alloc() + __folio_set_locked() for the
temporary page used to avoid data corruption during decompression.

When the cached folio is not uptodate, preserve the existing behavior by
using folio_file_page() and converting the returned page back to a
folio.

Update ni_readpage_cmpr() and ni_decompress_file() to handle the new
return type while keeping the existing struct page * array and the
unlock_page()/put_page() cleanup paths unchanged.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202602072013.jwrURE2e-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202602071921.nGIiI1J5-lkp@intel.com/
Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com>
[almaz.alexandrovich@paragon-software.com: removed ni_fiemap function,
added reported-by and closes tags to commit]
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

1 files changed, 26 insertions, 21 deletions

diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
index 2e901d073fe9..c0b9ca2426ab 100644
--- a/fs/ntfs3/frecord.c
+++ b/fs/ntfs3/frecord.c
@@ -1852,27 +1852,31 @@ enum REPARSE_SIGN ni_parse_reparse(struct ntfs_inode *ni, struct ATTRIB *attr,
 	return REPARSE_LINK;
 }
 
-static struct page *ntfs_lock_new_page(struct address_space *mapping,
-				       pgoff_t index, gfp_t gfp)
+static struct folio *ntfs_lock_new_page(struct address_space *mapping,
+					pgoff_t index, gfp_t gfp)
 {
-	struct folio *folio = __filemap_get_folio(
-		mapping, index, FGP_LOCK | FGP_ACCESSED | FGP_CREAT, gfp);
-	struct page *page;
+	struct folio *folio = __filemap_get_folio(mapping, index,
+			FGP_LOCK | FGP_ACCESSED | FGP_CREAT, gfp);
 
 	if (IS_ERR(folio))
-		return ERR_CAST(folio);
+		return folio;
 
-	if (!folio_test_uptodate(folio))
-		return folio_file_page(folio, index);
+	if (!folio_test_uptodate(folio)) {
+		struct page *page = folio_file_page(folio, index);
+
+		if (IS_ERR(page))
+			return ERR_CAST(page);
+		return page_folio(page);
+	}
 
 	/* Use a temporary page to avoid data corruption */
 	folio_unlock(folio);
 	folio_put(folio);
-	page = alloc_page(gfp);
-	if (!page)
+	folio = folio_alloc(gfp, 0);
+	if (!folio)
 		return ERR_PTR(-ENOMEM);
-	__SetPageLocked(page);
-	return page;
+	__folio_set_locked(folio);
+	return folio;
 }
 
 /*
@@ -1894,6 +1898,7 @@ int ni_read_folio_cmpr(struct ntfs_inode *ni, struct folio *folio)
 	u32 i, idx, frame_size, pages_per_frame;
 	gfp_t gfp_mask;
 	struct page *pg;
+	struct folio *f;
 
 	if (vbo >= i_size_read(&ni->vfs_inode)) {
 		folio_zero_range(folio, 0, folio_size(folio));
@@ -1929,12 +1934,12 @@ int ni_read_folio_cmpr(struct ntfs_inode *ni, struct folio *folio)
 		if (i == idx)
 			continue;
 
-		pg = ntfs_lock_new_page(mapping, index, gfp_mask);
-		if (IS_ERR(pg)) {
-			err = PTR_ERR(pg);
+		f = ntfs_lock_new_page(mapping, index, gfp_mask);
+		if (IS_ERR(f)) {
+			err = PTR_ERR(f);
 			goto out1;
 		}
-		pages[i] = pg;
+		pages[i] = &f->page;
 	}
 
 	ni_lock(ni);
@@ -2023,18 +2028,18 @@ int ni_decompress_file(struct ntfs_inode *ni)
 		}
 
 		for (i = 0; i < pages_per_frame; i++, index++) {
-			struct page *pg;
+			struct folio *f;
 
-			pg = ntfs_lock_new_page(mapping, index, gfp_mask);
-			if (IS_ERR(pg)) {
+			f = ntfs_lock_new_page(mapping, index, gfp_mask);
+			if (IS_ERR(f)) {
 				while (i--) {
 					unlock_page(pages[i]);
 					put_page(pages[i]);
 				}
-				err = PTR_ERR(pg);
+				err = PTR_ERR(f);
 				goto out;
 			}
-			pages[i] = pg;
+			pages[i] = &f->page;
 		}
 
 		err = ni_read_frame(ni, vbo, pages, pages_per_frame, 1);