erofs: kill __submit_bio()

As Christoph pointed out [1], "
Why is there __submit_bio which really just obsfucates
what is going on?  Also why is __submit_bio using
bio_set_op_attrs instead of opencode it as the comment
right next to it asks you to? "

Let's use submit_bio directly instead.

[1] https://lore.kernel.org/r/20190830162812.GA10694@infradead.org/Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190904020912.63925-18-gaoxiang25@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/erofs/data.c

@@ -40,7 +40,8 @@ static inline void read_endio(struct bio *bio)
 
 static struct bio *erofs_grab_raw_bio(struct super_block *sb,
 				      erofs_blk_t blkaddr,
-				      unsigned int nr_pages)
+				      unsigned int nr_pages,
+				      bool ismeta)
 {
 	struct bio *bio = bio_alloc(GFP_NOIO, nr_pages);
 
@@ -48,6 +49,11 @@ static struct bio *erofs_grab_raw_bio(struct super_block *sb,
 	bio_set_dev(bio, sb->s_bdev);
 	bio->bi_iter.bi_sector = (sector_t)blkaddr << LOG_SECTORS_PER_BLOCK;
 	bio->bi_private = sb;
+	if (ismeta)
+		bio->bi_opf = REQ_OP_READ | REQ_META;
+	else
+		bio->bi_opf = REQ_OP_READ;
+
 	return bio;
 }
 
@@ -69,14 +75,14 @@ struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr)
 	if (!PageUptodate(page)) {
 		struct bio *bio;
 
-		bio = erofs_grab_raw_bio(sb, blkaddr, 1);
+		bio = erofs_grab_raw_bio(sb, blkaddr, 1, true);
 
 		if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE) {
 			err = -EFAULT;
 			goto err_out;
 		}
 
-		__submit_bio(bio, REQ_OP_READ, REQ_META);
+		submit_bio(bio);
 		lock_page(page);
 
 		/* this page has been truncated by others */
@@ -201,7 +207,7 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio,
 	    /* not continuous */
 	    *last_block + 1 != current_block) {
 submit_bio_retry:
-		__submit_bio(bio, REQ_OP_READ, 0);
+		submit_bio(bio);
 		bio = NULL;
 	}
 
@@ -271,7 +277,7 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio,
 		if (nblocks > BIO_MAX_PAGES)
 			nblocks = BIO_MAX_PAGES;
 
-		bio = erofs_grab_raw_bio(sb, blknr, nblocks);
+		bio = erofs_grab_raw_bio(sb, blknr, nblocks, false);
 	}
 
 	err = bio_add_page(bio, page, PAGE_SIZE, 0);
@@ -302,8 +308,7 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio,
 	/* if updated manually, continuous pages has a gap */
 	if (bio)
 submit_bio_out:
-		__submit_bio(bio, REQ_OP_READ, 0);
-
+		submit_bio(bio);
 	return err ? ERR_PTR(err) : NULL;
 }
 
@@ -367,7 +372,7 @@ static int erofs_raw_access_readpages(struct file *filp,
 
 	/* the rare case (end in gaps) */
 	if (bio)
-		__submit_bio(bio, REQ_OP_READ, 0);
+		submit_bio(bio);
 	return 0;
 }
 

fs/erofs/internal.h

@@ -409,13 +409,6 @@ static inline int z_erofs_map_blocks_iter(struct inode *inode,
 #endif	/* !CONFIG_EROFS_FS_ZIP */
 
 /* data.c */
-static inline void __submit_bio(struct bio *bio, unsigned int op,
-				unsigned int op_flags)
-{
-	bio_set_op_attrs(bio, op, op_flags);
-	submit_bio(bio);
-}
-
 struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr);
 
 int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int);

fs/erofs/zdata.c

@@ -1258,7 +1258,7 @@ static bool z_erofs_vle_submit_all(struct super_block *sb,
 
 		if (bio && force_submit) {
 submit_bio_retry:
-			__submit_bio(bio, REQ_OP_READ, 0);
+			submit_bio(bio);
 			bio = NULL;
 		}
 
@@ -1270,6 +1270,8 @@ static bool z_erofs_vle_submit_all(struct super_block *sb,
 			bio->bi_iter.bi_sector = (sector_t)(first_index + i) <<
 				LOG_SECTORS_PER_BLOCK;
 			bio->bi_private = bi_private;
+			bio->bi_opf = REQ_OP_READ;
+
 			++nr_bios;
 		}
 
@@ -1290,7 +1292,7 @@ static bool z_erofs_vle_submit_all(struct super_block *sb,
 	} while (owned_head != Z_EROFS_PCLUSTER_TAIL);
 
 	if (bio)
-		__submit_bio(bio, REQ_OP_READ, 0);
+		submit_bio(bio);
 
 	if (postsubmit_is_all_bypassed(q, nr_bios, force_fg))
 		return true;