[PATCH v3 2/5] io_uring/uring_cmd: add import flags to io_uring_cmd_import_fixed()

[Anuj Gupta <anuj1072538@gmail.com>]

From: Anuj Gupta <anuj20.g@samsung.com>

Add an import flags argument to io_uring_cmd_import_fixed(), so callers
can opt in to buffer types they support. No flags are defined yet, and
all callers pass 0.

No functional change.

Suggested-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
---
 drivers/nvme/host/ioctl.c    | 2 +-
 drivers/scsi/scsi_bsg.c      | 2 +-
 fs/fuse/dev_uring.c          | 2 +-
 include/linux/io_uring/cmd.h | 5 +++--
 io_uring/uring_cmd.c         | 5 ++++-
 5 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index a87c9ca9d06c..d342ccad067a 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -533,7 +533,7 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 					ddir, &iter, issue_flags);
 		else
 			ret = io_uring_cmd_import_fixed(d.addr, d.data_len,
-					ddir, &iter, ioucmd, issue_flags);
+					ddir, &iter, ioucmd, issue_flags, 0);
 		if (ret < 0)
 			return ret;
 
diff --git a/drivers/scsi/scsi_bsg.c b/drivers/scsi/scsi_bsg.c
index 5eec248a77a6..e53b417c27b9 100644
--- a/drivers/scsi/scsi_bsg.c
+++ b/drivers/scsi/scsi_bsg.c
@@ -87,7 +87,7 @@ static int scsi_bsg_map_user_buffer(struct request *req,
 	if (ioucmd->flags & IORING_URING_CMD_FIXED) {
 		ret = io_uring_cmd_import_fixed(buf_addr, buf_len,
 						is_write ? WRITE : READ,
-						&iter, ioucmd, issue_flags);
+						&iter, ioucmd, issue_flags, 0);
 		if (ret < 0)
 			return ret;
 		ret = blk_rq_map_user_iov(req->q, req, NULL, &iter, gfp_mask);
diff --git a/fs/fuse/dev_uring.c b/fs/fuse/dev_uring.c
index c6dd420c4034..5cc206abccc0 100644
--- a/fs/fuse/dev_uring.c
+++ b/fs/fuse/dev_uring.c
@@ -727,7 +727,7 @@ static int fuse_uring_import_payload(struct fuse_ring_ent *ent, int dir,
 
 	if (bufpool_registered(ent->queue))
 		err = io_uring_cmd_import_fixed((u64)(uintptr_t)base, len, dir,
-						iter, ent->cmd, issue_flags);
+						iter, ent->cmd, issue_flags, 0);
 	else
 		err = import_ubuf(dir, base, len, iter);
 
diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h
index e18d4af62e1a..23fb66a1e2c1 100644
--- a/include/linux/io_uring/cmd.h
+++ b/include/linux/io_uring/cmd.h
@@ -64,7 +64,8 @@ static inline void io_uring_cmd_set_res32(struct io_uring_cmd *cmd, s32 ret, u64
 int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
 			      struct iov_iter *iter,
 			      struct io_uring_cmd *ioucmd,
-			      unsigned int issue_flags);
+			      unsigned int issue_flags,
+			      unsigned int import_flags);
 int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
 				  const struct iovec __user *uvec,
 				  size_t uvec_segs,
@@ -124,7 +125,7 @@ int io_buffer_unregister(struct io_uring_cmd *cmd, unsigned int index,
 static inline int
 io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
 			  struct iov_iter *iter, struct io_uring_cmd *ioucmd,
-			  unsigned int issue_flags)
+			  unsigned int issue_flags, unsigned int import_flags)
 {
 	return -EOPNOTSUPP;
 }
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index 4dac3ba162ae..d77a94d19cb5 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -272,12 +272,15 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
 int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
 			      struct iov_iter *iter,
 			      struct io_uring_cmd *ioucmd,
-			      unsigned int issue_flags)
+			      unsigned int issue_flags,
+			      unsigned int import_flags)
 {
 	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
 
 	if (WARN_ON_ONCE(!(ioucmd->flags & IORING_URING_CMD_FIXED)))
 		return -EINVAL;
+	if (WARN_ON_ONCE(import_flags))
+		return -EINVAL;
 
 	return io_import_reg_buf(req, iter, ubuf, len, rw, issue_flags, 0);
 }
-- 
2.43.0