f2fs: convert f2fs_compress_ctx_add_page() to use folio

onvert to use folio, so that we can get rid of 'page->index' to
prepare for removal of 'index' field in structure page [1].

[1] https://lore.kernel.org/all/Zp8fgUSIBGQ1TN0D@casper.infradead.org/

Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/compress.c

@@ -160,17 +160,17 @@ void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
 		cc->cluster_idx = NULL_CLUSTER;
 }
 
-void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
+void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct folio *folio)
 {
 	unsigned int cluster_ofs;
 
-	if (!f2fs_cluster_can_merge_page(cc, page->index))
+	if (!f2fs_cluster_can_merge_page(cc, folio->index))
 		f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
 
-	cluster_ofs = offset_in_cluster(cc, page->index);
-	cc->rpages[cluster_ofs] = page;
+	cluster_ofs = offset_in_cluster(cc, folio->index);
+	cc->rpages[cluster_ofs] = folio_page(folio, 0);
 	cc->nr_rpages++;
-	cc->cluster_idx = cluster_idx(cc, page->index);
+	cc->cluster_idx = cluster_idx(cc, folio->index);
 }
 
 #ifdef CONFIG_F2FS_FS_LZO
@@ -1113,7 +1113,7 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
 		if (PageUptodate(page))
 			f2fs_put_page(page, 1);
 		else
-			f2fs_compress_ctx_add_page(cc, page);
+			f2fs_compress_ctx_add_page(cc, page_folio(page));
 	}
 
 	if (!f2fs_cluster_is_empty(cc)) {
@@ -1143,7 +1143,7 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
 		}
 
 		f2fs_wait_on_page_writeback(page, DATA, true, true);
-		f2fs_compress_ctx_add_page(cc, page);
+		f2fs_compress_ctx_add_page(cc, page_folio(page));
 
 		if (!PageUptodate(page)) {
 release_and_retry:

fs/f2fs/data.c

@@ -2429,7 +2429,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
 		if (ret)
 			goto set_error_page;
 
-		f2fs_compress_ctx_add_page(&cc, &folio->page);
+		f2fs_compress_ctx_add_page(&cc, folio);
 
 		goto next_page;
 read_single_page:
@@ -3161,7 +3161,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 			if (f2fs_compressed_file(inode)) {
 				folio_get(folio);
-				f2fs_compress_ctx_add_page(&cc, &folio->page);
+				f2fs_compress_ctx_add_page(&cc, folio);
 				continue;
 			}
 #endif

fs/f2fs/f2fs.h

@@ -4327,7 +4327,7 @@ bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index);
 bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
 				int index, int nr_pages, bool uptodate);
 bool f2fs_sanity_check_cluster(struct dnode_of_data *dn);
-void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page);
+void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct folio *folio);
 int f2fs_write_multi_pages(struct compress_ctx *cc,
 						int *submitted,
 						struct writeback_control *wbc,