remove call_{read,write}_iter() functions

These have no clear purpose. This is effectively a revert of commit
bb7462b6fd64 ("vfs: use helpers for calling f_op->{read,write}_iter()").

The patch was created with the help of a coccinelle script.

Fixes: bb7462b6fd64 ("vfs: use helpers for calling f_op->{read,write}_iter()")
Reviewed-by: Christian Brauner <[e-mail]>
Signed-off-by: Miklos Szeredi <[e-mail]>
Signed-off-by: Al Viro <[e-mail]>

drivers/block/loop.c

···
 	cmd->iocb.ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
 
 	if (rw == ITER_SOURCE)
-		ret = call_write_iter(file, &cmd->iocb, &iter);
+		ret = file->f_op->write_iter(&cmd->iocb, &iter);
 	else
-		ret = call_read_iter(file, &cmd->iocb, &iter);
+		ret = file->f_op->read_iter(&cmd->iocb, &iter);
 
 	lo_rw_aio_do_completion(cmd);
 

drivers/target/target_core_file.c

···
 		aio_cmd->iocb.ki_flags |= IOCB_DSYNC;
 
 	if (is_write)
-		ret = call_write_iter(file, &aio_cmd->iocb, &iter);
+		ret = file->f_op->write_iter(&aio_cmd->iocb, &iter);
 	else
-		ret = call_read_iter(file, &aio_cmd->iocb, &iter);
+		ret = file->f_op->read_iter(&aio_cmd->iocb, &iter);
 
 	if (ret != -EIOCBQUEUED)
 		cmd_rw_aio_complete(&aio_cmd->iocb, ret);

fs/aio.c

···
 		return ret;
 	ret = rw_verify_area(READ, file, &req->ki_pos, iov_iter_count(&iter));
 	if (!ret)
-		aio_rw_done(req, call_read_iter(file, req, &iter));
+		aio_rw_done(req, file->f_op->read_iter(req, &iter));
 	kfree(iovec);
 	return ret;
 }
···
 		if (S_ISREG(file_inode(file)->i_mode))
 			kiocb_start_write(req);
 		req->ki_flags |= IOCB_WRITE;
-		aio_rw_done(req, call_write_iter(file, req, &iter));
+		aio_rw_done(req, file->f_op->write_iter(req, &iter));
 	}
 	kfree(iovec);
 	return ret;

fs/read_write.c

···
 	kiocb.ki_pos = (ppos ? *ppos : 0);
 	iov_iter_ubuf(&iter, ITER_DEST, buf, len);
 
-	ret = call_read_iter(filp, &kiocb, &iter);
+	ret = filp->f_op->read_iter(&kiocb, &iter);
 	BUG_ON(ret == -EIOCBQUEUED);
 	if (ppos)
 		*ppos = kiocb.ki_pos;
···
 	kiocb.ki_pos = (ppos ? *ppos : 0);
 	iov_iter_ubuf(&iter, ITER_SOURCE, (void __user *)buf, len);
 
-	ret = call_write_iter(filp, &kiocb, &iter);
+	ret = filp->f_op->write_iter(&kiocb, &iter);
 	BUG_ON(ret == -EIOCBQUEUED);
 	if (ret > 0 && ppos)
 		*ppos = kiocb.ki_pos;
···
 	kiocb.ki_pos = (ppos ? *ppos : 0);
 
 	if (type == READ)
-		ret = call_read_iter(filp, &kiocb, iter);
+		ret = filp->f_op->read_iter(&kiocb, iter);
 	else
-		ret = call_write_iter(filp, &kiocb, iter);
+		ret = filp->f_op->write_iter(&kiocb, iter);
 	BUG_ON(ret == -EIOCBQUEUED);
 	if (ppos)
 		*ppos = kiocb.ki_pos;
···
 	if (ret < 0)
 		return ret;
 
-	ret = call_read_iter(file, iocb, iter);
+	ret = file->f_op->read_iter(iocb, iter);
 out:
 	if (ret >= 0)
 		fsnotify_access(file);
···
 		return ret;
 
 	kiocb_start_write(iocb);
-	ret = call_write_iter(file, iocb, iter);
+	ret = file->f_op->write_iter(iocb, iter);
 	if (ret != -EIOCBQUEUED)
 		kiocb_end_write(iocb);
 	if (ret > 0)

fs/splice.c

···
 	iov_iter_bvec(&to, ITER_DEST, bv, npages, len);
 	init_sync_kiocb(&kiocb, in);
 	kiocb.ki_pos = *ppos;
-	ret = call_read_iter(in, &kiocb, &to);
+	ret = in->f_op->read_iter(&kiocb, &to);
 
 	if (ret > 0) {
 		keep = DIV_ROUND_UP(ret, PAGE_SIZE);
···
 		iov_iter_bvec(&from, ITER_SOURCE, array, n, sd.total_len - left);
 		init_sync_kiocb(&kiocb, out);
 		kiocb.ki_pos = sd.pos;
-		ret = call_write_iter(out, &kiocb, &from);
+		ret = out->f_op->write_iter(&kiocb, &from);
 		sd.pos = kiocb.ki_pos;
 		if (ret <= 0)
 			break;

include/linux/fs.h

···
 	struct offset_ctx *(*get_offset_ctx)(struct inode *inode);
 } ____cacheline_aligned;
 
-static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio,
-				     struct iov_iter *iter)
-{
-	return file->f_op->read_iter(kio, iter);
-}
-
-static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio,
-				      struct iov_iter *iter)
-{
-	return file->f_op->write_iter(kio, iter);
-}
-
 static inline int call_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	return file->f_op->mmap(file, vma);

io_uring/rw.c

···
 	struct file *file = rw->kiocb.ki_filp;
 
 	if (likely(file->f_op->read_iter))
-		return call_read_iter(file, &rw->kiocb, iter);
+		return file->f_op->read_iter(&rw->kiocb, iter);
 	else if (file->f_op->read)
 		return loop_rw_iter(READ, rw, iter);
 	else
···
 	kiocb->ki_flags |= IOCB_WRITE;
 
 	if (likely(req->file->f_op->write_iter))
-		ret2 = call_write_iter(req->file, kiocb, &s->iter);
+		ret2 = req->file->f_op->write_iter(kiocb, &s->iter);
 	else if (req->file->f_op->write)
 		ret2 = loop_rw_iter(WRITE, rw, &s->iter);
 	else