[PATCHv11 02/10] io_uring: protection information enhancements

[Anuj Gupta]

On 05/12/24 05:53PM, Keith Busch wrote:
>From: Keith Busch <kbusch at kernel.org>
>
>diff --git a/io_uring/rw.c b/io_uring/rw.c
>index 04e4467ab0ee8..a2987aefb2cec 100644
>--- a/io_uring/rw.c
>+++ b/io_uring/rw.c
>@@ -272,14 +272,14 @@ static inline void io_meta_restore(struct io_async_rw *io, struct kiocb *kiocb)
> }
>
> static int io_prep_rw_pi(struct io_kiocb *req, struct io_rw *rw, int ddir,
>-			 u64 attr_ptr, u64 attr_type_mask)
>+			 u64 *attr_ptr)
> {
> 	struct io_uring_attr_pi pi_attr;
> 	struct io_async_rw *io;
> 	int ret;
>
>-	if (copy_from_user(&pi_attr, u64_to_user_ptr(attr_ptr),
>-	    sizeof(pi_attr)))
>+	if (copy_from_user(&pi_attr, u64_to_user_ptr(*attr_ptr),
>+			   sizeof(pi_attr)))
> 		return -EFAULT;
>
> 	if (pi_attr.rsvd)
>@@ -295,6 +295,7 @@ static int io_prep_rw_pi(struct io_kiocb *req, struct io_rw *rw, int ddir,
> 		return ret;
> 	rw->kiocb.ki_flags |= IOCB_HAS_METADATA;
> 	io_meta_save_state(io);
>+	*attr_ptr += sizeof(pi_attr);
> 	return ret;
> }
>
>@@ -335,8 +336,7 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
> 	if (attr_type_mask) {
> 		u64 attr_ptr;
>
>-		/* only PI attribute is supported currently */
>-		if (attr_type_mask != IORING_RW_ATTR_FLAG_PI)
>+		if (attr_type_mask & ~IORING_RW_ATTR_FLAGS_SUPPORTED)
> 			return -EINVAL;
>
> 		attr_ptr = READ_ONCE(sqe->attr_ptr);
>-- 

Nit:
Although the next patch does it, but the call to io_prep_rw_pi should
pass a u64 pointer in this patch itself.