f2fs: introduce {page,io}_is_mergeable() for readability

Wrap merge condition into function for readability, no logic change.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -481,6 +481,33 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 	return 0;
 }
 
+static bool page_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
+				block_t last_blkaddr, block_t cur_blkaddr)
+{
+	if (last_blkaddr + 1 != cur_blkaddr)
+		return false;
+	return __same_bdev(sbi, cur_blkaddr, bio);
+}
+
+static bool io_type_is_mergeable(struct f2fs_bio_info *io,
+						struct f2fs_io_info *fio)
+{
+	if (io->fio.op != fio->op)
+		return false;
+	return io->fio.op_flags == fio->op_flags;
+}
+
+static bool io_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
+					struct f2fs_bio_info *io,
+					struct f2fs_io_info *fio,
+					block_t last_blkaddr,
+					block_t cur_blkaddr)
+{
+	if (!page_is_mergeable(sbi, bio, last_blkaddr, cur_blkaddr))
+		return false;
+	return io_type_is_mergeable(io, fio);
+}
+
 int f2fs_merge_page_bio(struct f2fs_io_info *fio)
 {
 	struct bio *bio = *fio->bio;
@@ -494,8 +521,8 @@ int f2fs_merge_page_bio(struct f2fs_io_info *fio)
 	trace_f2fs_submit_page_bio(page, fio);
 	f2fs_trace_ios(fio, 0);
 
-	if (bio && (*fio->last_block + 1 != fio->new_blkaddr ||
-			!__same_bdev(fio->sbi, fio->new_blkaddr, bio))) {
+	if (bio && !page_is_mergeable(fio->sbi, bio, *fio->last_block,
+						fio->new_blkaddr)) {
 		__submit_bio(fio->sbi, bio, fio->type);
 		bio = NULL;
 	}
@@ -568,9 +595,8 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio)
 
 	inc_page_count(sbi, WB_DATA_TYPE(bio_page));
 
-	if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 ||
-	    (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) ||
-			!__same_bdev(sbi, fio->new_blkaddr, io->bio)))
+	if (io->bio && !io_is_mergeable(sbi, io->bio, io, fio,
+			io->last_block_in_bio, fio->new_blkaddr))
 		__submit_merged_bio(io);
 alloc_new:
 	if (io->bio == NULL) {
@@ -1642,8 +1668,8 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page,
 	 * This page will go to BIO.  Do we need to send this
 	 * BIO off first?
 	 */
-	if (bio && (*last_block_in_bio != block_nr - 1 ||
-		!__same_bdev(F2FS_I_SB(inode), block_nr, bio))) {
+	if (bio && !page_is_mergeable(F2FS_I_SB(inode), bio,
+				*last_block_in_bio, block_nr)) {
 submit_and_realloc:
 		__submit_bio(F2FS_I_SB(inode), bio, DATA);
 		bio = NULL;