f2fs: use BIO_MAX_PAGES for bio allocation

We don't need to allocate bio partially in order to maximize sequential writes.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b544e0b..68edb47 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -277,10 +277,8 @@
 		__submit_merged_bio(io);
 alloc_new:
 	if (io->bio == NULL) {
-		int bio_blocks = MAX_BIO_BLOCKS(sbi);
-
 		io->bio = __bio_alloc(sbi, fio->new_blkaddr,
-						bio_blocks, is_read);
+						BIO_MAX_PAGES, is_read);
 		io->fio = *fio;
 	}