f2fs: convert f2fs_read_multi_pages() to use folio

Convert 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/[email protected]/

Cc: Matthew Wilcox <[email protected]>
Signed-off-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>

Author: chaseyu

fs/f2fs/data.c

@@ -2207,19 +2207,22 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
 	/* get rid of pages beyond EOF */
 	for (i = 0; i < cc->cluster_size; i++) {
 		struct page *page = cc->rpages[i];
+		struct folio *folio;
 
 		if (!page)
 			continue;
-		if ((sector_t)page->index >= last_block_in_file) {
-			zero_user_segment(page, 0, PAGE_SIZE);
-			if (!PageUptodate(page))
-				SetPageUptodate(page);
-		} else if (!PageUptodate(page)) {
+
+		folio = page_folio(page);
+		if ((sector_t)folio->index >= last_block_in_file) {
+			folio_zero_segment(folio, 0, folio_size(folio));
+			if (!folio_test_uptodate(folio))
+				folio_mark_uptodate(folio);
+		} else if (!folio_test_uptodate(folio)) {
 			continue;
 		}
-		unlock_page(page);
+		folio_unlock(folio);
 		if (for_write)
-			put_page(page);
+			folio_put(folio);
 		cc->rpages[i] = NULL;
 		cc->nr_rpages--;
 	}
@@ -2279,7 +2282,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
 	}
 
 	for (i = 0; i < cc->nr_cpages; i++) {
-		struct page *page = dic->cpages[i];
+		struct folio *folio = page_folio(dic->cpages[i]);
 		block_t blkaddr;
 		struct bio_post_read_ctx *ctx;
 
@@ -2289,7 +2292,8 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
 
 		f2fs_wait_on_block_writeback(inode, blkaddr);
 
-		if (f2fs_load_compressed_page(sbi, page, blkaddr)) {
+		if (f2fs_load_compressed_page(sbi, folio_page(folio, 0),
+								blkaddr)) {
 			if (atomic_dec_and_test(&dic->remaining_pages)) {
 				f2fs_decompress_cluster(dic, true);
 				break;
@@ -2299,7 +2303,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
 
 		if (bio && (!page_is_mergeable(sbi, bio,
 					*last_block_in_bio, blkaddr) ||
-		    !f2fs_crypt_mergeable_bio(bio, inode, page->index, NULL))) {
+		    !f2fs_crypt_mergeable_bio(bio, inode, folio->index, NULL))) {
 submit_and_realloc:
 			f2fs_submit_read_bio(sbi, bio, DATA);
 			bio = NULL;
@@ -2308,7 +2312,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
 		if (!bio) {
 			bio = f2fs_grab_read_bio(inode, blkaddr, nr_pages,
 					f2fs_ra_op_flags(rac),
-					page->index, for_write);
+					folio->index, for_write);
 			if (IS_ERR(bio)) {
 				ret = PTR_ERR(bio);
 				f2fs_decompress_end_io(dic, ret, true);
@@ -2318,7 +2322,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
 			}
 		}
 
-		if (bio_add_page(bio, page, blocksize, 0) < blocksize)
+		if (!bio_add_folio(bio, folio, blocksize, 0))
 			goto submit_and_realloc;
 
 		ctx = get_post_read_ctx(bio);