fs: use the super_block as holder when mounting file systems

The file system type is not a very useful holder as it doesn't allow us
to go back to the actual file system instance.  Pass the super_block instead
which is useful when passed back to the file system driver.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Message-Id: <20230802154131.2221419-7-hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/cramfs/inode.c

@@ -494,7 +494,7 @@ static void cramfs_kill_sb(struct super_block *sb)
 		sb->s_mtd = NULL;
 	} else if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV) && sb->s_bdev) {
 		sync_blockdev(sb->s_bdev);
-		blkdev_put(sb->s_bdev, sb->s_type);
+		blkdev_put(sb->s_bdev, sb);
 	}
 	kfree(sbi);
 }

fs/f2fs/super.c

@@ -1561,7 +1561,7 @@ static void destroy_device_list(struct f2fs_sb_info *sbi)
 	int i;
 
 	for (i = 0; i < sbi->s_ndevs; i++) {
-		blkdev_put(FDEV(i).bdev, sbi->sb->s_type);
+		blkdev_put(FDEV(i).bdev, sbi->sb);
 #ifdef CONFIG_BLK_DEV_ZONED
 		kvfree(FDEV(i).blkz_seq);
 #endif
@@ -4198,7 +4198,7 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
 			/* Single zoned block device mount */
 			FDEV(0).bdev =
 				blkdev_get_by_dev(sbi->sb->s_bdev->bd_dev, mode,
-						  sbi->sb->s_type, NULL);
+						  sbi->sb, NULL);
 		} else {
 			/* Multi-device mount */
 			memcpy(FDEV(i).path, RDEV(i).path, MAX_PATH_LEN);
@@ -4217,8 +4217,7 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
 					sbi->log_blocks_per_seg) - 1;
 			}
 			FDEV(i).bdev = blkdev_get_by_path(FDEV(i).path, mode,
-							  sbi->sb->s_type,
-							  NULL);
+							  sbi->sb, NULL);
 		}
 		if (IS_ERR(FDEV(i).bdev))
 			return PTR_ERR(FDEV(i).bdev);

fs/romfs/super.c

@@ -594,7 +594,7 @@ static void romfs_kill_sb(struct super_block *sb)
 #ifdef CONFIG_ROMFS_ON_BLOCK
 	if (sb->s_bdev) {
 		sync_blockdev(sb->s_bdev);
-		blkdev_put(sb->s_bdev, sb->s_type);
+		blkdev_put(sb->s_bdev, sb);
 	}
 #endif
 }

fs/super.c

@@ -1249,7 +1249,7 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
 	blk_mode_t mode = sb_open_mode(sb_flags);
 	struct block_device *bdev;
 
-	bdev = blkdev_get_by_dev(sb->s_dev, mode, sb->s_type, &fs_holder_ops);
+	bdev = blkdev_get_by_dev(sb->s_dev, mode, sb, &fs_holder_ops);
 	if (IS_ERR(bdev)) {
 		if (fc)
 			errorf(fc, "%s: Can't open blockdev", fc->source);
@@ -1262,7 +1262,7 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
 	 * writable from userspace even for a read-only block device.
 	 */
 	if ((mode & BLK_OPEN_WRITE) && bdev_read_only(bdev)) {
-		blkdev_put(bdev, sb->s_type);
+		blkdev_put(bdev, sb);
 		return -EACCES;
 	}
 
@@ -1278,7 +1278,7 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
 		mutex_unlock(&bdev->bd_fsfreeze_mutex);
 		if (fc)
 			warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);
-		blkdev_put(bdev, sb->s_type);
+		blkdev_put(bdev, sb);
 		return -EBUSY;
 	}
 	spin_lock(&sb_lock);
@@ -1415,7 +1415,7 @@ void kill_block_super(struct super_block *sb)
 	generic_shutdown_super(sb);
 	if (bdev) {
 		sync_blockdev(bdev);
-		blkdev_put(bdev, sb->s_type);
+		blkdev_put(bdev, sb);
 	}
 }
 

fs/xfs/xfs_buf.c

@@ -1948,7 +1948,7 @@ xfs_free_buftarg(
 	fs_put_dax(btp->bt_daxdev, btp->bt_mount);
 	/* the main block device is closed by kill_block_super */
 	if (bdev != btp->bt_mount->m_super->s_bdev)
-		blkdev_put(bdev, btp->bt_mount);
+		blkdev_put(bdev, btp->bt_mount->m_super);
 
 	kmem_free(btp);
 }