f2fs: don't pass a bio to f2fs_target_device

Set the bdev at bio allocation time by changing the f2fs_target_device
calling conventions, so that no bio needs to be passed in.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20220228124123.856027-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/f2fs/data.c

@@ -354,7 +354,7 @@ static void f2fs_write_end_io(struct bio *bio)
 }
 
 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
-				block_t blk_addr, struct bio *bio)
+		block_t blk_addr, sector_t *sector)
 {
 	struct block_device *bdev = sbi->sb->s_bdev;
 	int i;
@@ -369,10 +369,9 @@ struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
 			}
 		}
 	}
-	if (bio) {
-		bio_set_dev(bio, bdev);
-		bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
-	}
+
+	if (sector)
+		*sector = SECTOR_FROM_BLOCK(blk_addr);
 	return bdev;
 }
 
@@ -392,11 +391,13 @@ int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
 static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
 {
 	struct f2fs_sb_info *sbi = fio->sbi;
+	struct block_device *bdev;
+	sector_t sector;
 	struct bio *bio;
 
-	bio = bio_alloc_bioset(NULL, npages, 0, GFP_NOIO, &f2fs_bioset);
-
-	f2fs_target_device(sbi, fio->new_blkaddr, bio);
+	bdev = f2fs_target_device(sbi, fio->new_blkaddr, &sector);
+	bio = bio_alloc_bioset(bdev, npages, 0, GFP_NOIO, &f2fs_bioset);
+	bio->bi_iter.bi_sector = sector;
 	if (is_read_io(fio->op)) {
 		bio->bi_end_io = f2fs_read_end_io;
 		bio->bi_private = NULL;
@@ -984,15 +985,15 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
 	struct bio *bio;
 	struct bio_post_read_ctx *ctx = NULL;
 	unsigned int post_read_steps = 0;
+	sector_t sector;
+	struct block_device *bdev = f2fs_target_device(sbi, blkaddr, &sector);
 
-	bio = bio_alloc_bioset(NULL, bio_max_segs(nr_pages), REQ_OP_READ,
+	bio = bio_alloc_bioset(bdev, bio_max_segs(nr_pages), REQ_OP_READ,
 			       for_write ? GFP_NOIO : GFP_KERNEL, &f2fs_bioset);
 	if (!bio)
 		return ERR_PTR(-ENOMEM);
-
+	bio->bi_iter.bi_sector = sector;
 	f2fs_set_bio_crypt_ctx(bio, inode, first_idx, NULL, GFP_NOFS);
-
-	f2fs_target_device(sbi, blkaddr, bio);
 	bio->bi_end_io = f2fs_read_end_io;
 
 	if (fscrypt_inode_uses_fs_layer_crypto(inode))

fs/f2fs/f2fs.h

@@ -3631,7 +3631,7 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio);
 int f2fs_merge_page_bio(struct f2fs_io_info *fio);
 void f2fs_submit_page_write(struct f2fs_io_info *fio);
 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
-			block_t blk_addr, struct bio *bio);
+		block_t blk_addr, sector_t *sector);
 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr);
 void f2fs_set_data_blkaddr(struct dnode_of_data *dn);
 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr);