[PATCH 1/4] io_uring: add IORING_OP_READ{WRITE}V_PI cmd

[Bob Liu <bob.liu@xxxxxxxxxx>]

Add read and write with protect information command.

Signed-off-by: Bob Liu <bob.liu@xxxxxxxxxx>
---
 fs/io_uring.c                 | 12 ++++++++++++
 include/linux/fs.h            |  1 +
 include/uapi/linux/io_uring.h |  2 ++
 3 files changed, 15 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 562e3a1..c43d96a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -630,12 +630,14 @@ static inline bool io_prep_async_work(struct io_kiocb *req,
 
 	switch (req->opcode) {
 	case IORING_OP_WRITEV:
+	case IORING_OP_WRITEV_PI:
 	case IORING_OP_WRITE_FIXED:
 		/* only regular files should be hashed for writes */
 		if (req->flags & REQ_F_ISREG)
 			do_hashed = true;
 		/* fall-through */
 	case IORING_OP_READV:
+	case IORING_OP_READV_PI:
 	case IORING_OP_READ_FIXED:
 	case IORING_OP_SENDMSG:
 	case IORING_OP_RECVMSG:
@@ -1505,6 +1507,12 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 	kiocb->ki_pos = READ_ONCE(sqe->off);
 	kiocb->ki_flags = iocb_flags(kiocb->ki_filp);
 	kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp));
+	if (req->opcode == IORING_OP_READV_PI ||
+			req->opcode == IORING_OP_WRITEV_PI) {
+		if (!(req->file->f_flags & O_DIRECT))
+			return -EINVAL;
+		kiocb->ki_flags |= IOCB_USE_PI;
+	}
 
 	ioprio = READ_ONCE(sqe->ioprio);
 	if (ioprio) {
@@ -3065,10 +3073,12 @@ static int io_req_defer_prep(struct io_kiocb *req,
 	case IORING_OP_NOP:
 		break;
 	case IORING_OP_READV:
+	case IORING_OP_READV_PI:
 	case IORING_OP_READ_FIXED:
 		ret = io_read_prep(req, sqe, true);
 		break;
 	case IORING_OP_WRITEV:
+	case IORING_OP_WRITEV_PI:
 	case IORING_OP_WRITE_FIXED:
 		ret = io_write_prep(req, sqe, true);
 		break;
@@ -3156,6 +3166,7 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 	case IORING_OP_NOP:
 		ret = io_nop(req);
 		break;
+	case IORING_OP_READV_PI:
 	case IORING_OP_READV:
 	case IORING_OP_READ_FIXED:
 		if (sqe) {
@@ -3166,6 +3177,7 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 		ret = io_read(req, nxt, force_nonblock);
 		break;
 	case IORING_OP_WRITEV:
+	case IORING_OP_WRITEV_PI:
 	case IORING_OP_WRITE_FIXED:
 		if (sqe) {
 			ret = io_write_prep(req, sqe, force_nonblock);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 98e0349..65fda07 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -314,6 +314,7 @@ enum rw_hint {
 #define IOCB_SYNC		(1 << 5)
 #define IOCB_WRITE		(1 << 6)
 #define IOCB_NOWAIT		(1 << 7)
+#define IOCB_USE_PI		(1 << 8)
 
 struct kiocb {
 	struct file		*ki_filp;
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index a3300e1..98fa3f1 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -62,6 +62,8 @@ enum {
 	IORING_OP_NOP,
 	IORING_OP_READV,
 	IORING_OP_WRITEV,
+	IORING_OP_READV_PI,
+	IORING_OP_WRITEV_PI,
 	IORING_OP_FSYNC,
 	IORING_OP_READ_FIXED,
 	IORING_OP_WRITE_FIXED,
-- 
2.9.5