nvme: replace the fmode_t argument to the nvme ioctl handlers with a simple bool

Instead of passing a fmode_t and only checking it fo0r FMODE_WRITE, pass
a bool open_for_write to prepare for callers that won't have the fmode_t.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20230608110258.189493-22-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/nvme/host/ioctl.c

@@ -14,7 +14,7 @@ enum {
 };
 
 static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c,
-		unsigned int flags, fmode_t mode)
+		unsigned int flags, bool open_for_write)
 {
 	u32 effects;
 
@@ -80,7 +80,7 @@ static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c,
 	 * writing.
 	 */
 	if (nvme_is_write(c) || (effects & NVME_CMD_EFFECTS_LBCC))
-		return mode & FMODE_WRITE;
+		return open_for_write;
 	return true;
 }
 
@@ -337,7 +337,7 @@ static bool nvme_validate_passthru_nsid(struct nvme_ctrl *ctrl,
 
 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 		struct nvme_passthru_cmd __user *ucmd, unsigned int flags,
-		fmode_t mode)
+		bool open_for_write)
 {
 	struct nvme_passthru_cmd cmd;
 	struct nvme_command c;
@@ -365,7 +365,7 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	c.common.cdw14 = cpu_to_le32(cmd.cdw14);
 	c.common.cdw15 = cpu_to_le32(cmd.cdw15);
 
-	if (!nvme_cmd_allowed(ns, &c, 0, mode))
+	if (!nvme_cmd_allowed(ns, &c, 0, open_for_write))
 		return -EACCES;
 
 	if (cmd.timeout_ms)
@@ -385,7 +385,7 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 
 static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 		struct nvme_passthru_cmd64 __user *ucmd, unsigned int flags,
-		fmode_t mode)
+		bool open_for_write)
 {
 	struct nvme_passthru_cmd64 cmd;
 	struct nvme_command c;
@@ -412,7 +412,7 @@ static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	c.common.cdw14 = cpu_to_le32(cmd.cdw14);
 	c.common.cdw15 = cpu_to_le32(cmd.cdw15);
 
-	if (!nvme_cmd_allowed(ns, &c, flags, mode))
+	if (!nvme_cmd_allowed(ns, &c, flags, open_for_write))
 		return -EACCES;
 
 	if (cmd.timeout_ms)
@@ -583,7 +583,7 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14));
 	c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15));
 
-	if (!nvme_cmd_allowed(ns, &c, 0, ioucmd->file->f_mode))
+	if (!nvme_cmd_allowed(ns, &c, 0, ioucmd->file->f_mode & FMODE_WRITE))
 		return -EACCES;
 
 	d.metadata = READ_ONCE(cmd->metadata);
@@ -649,13 +649,13 @@ static bool is_ctrl_ioctl(unsigned int cmd)
 }
 
 static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd,
-		void __user *argp, fmode_t mode)
+		void __user *argp, bool open_for_write)
 {
 	switch (cmd) {
 	case NVME_IOCTL_ADMIN_CMD:
-		return nvme_user_cmd(ctrl, NULL, argp, 0, mode);
+		return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write);
 	case NVME_IOCTL_ADMIN64_CMD:
-		return nvme_user_cmd64(ctrl, NULL, argp, 0, mode);
+		return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write);
 	default:
 		return sed_ioctl(ctrl->opal_dev, cmd, argp);
 	}
@@ -680,14 +680,14 @@ struct nvme_user_io32 {
 #endif /* COMPAT_FOR_U64_ALIGNMENT */
 
 static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd,
-		void __user *argp, unsigned int flags, fmode_t mode)
+		void __user *argp, unsigned int flags, bool open_for_write)
 {
 	switch (cmd) {
 	case NVME_IOCTL_ID:
 		force_successful_syscall_return();
 		return ns->head->ns_id;
 	case NVME_IOCTL_IO_CMD:
-		return nvme_user_cmd(ns->ctrl, ns, argp, flags, mode);
+		return nvme_user_cmd(ns->ctrl, ns, argp, flags, open_for_write);
 	/*
 	 * struct nvme_user_io can have different padding on some 32-bit ABIs.
 	 * Just accept the compat version as all fields that are used are the
@@ -702,7 +702,8 @@ static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd,
 		flags |= NVME_IOCTL_VEC;
 		fallthrough;
 	case NVME_IOCTL_IO64_CMD:
-		return nvme_user_cmd64(ns->ctrl, ns, argp, flags, mode);
+		return nvme_user_cmd64(ns->ctrl, ns, argp, flags,
+				       open_for_write);
 	default:
 		return -ENOTTY;
 	}
@@ -712,6 +713,7 @@ int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 		unsigned int cmd, unsigned long arg)
 {
 	struct nvme_ns *ns = bdev->bd_disk->private_data;
+	bool open_for_write = mode & FMODE_WRITE;
 	void __user *argp = (void __user *)arg;
 	unsigned int flags = 0;
 
@@ -719,19 +721,20 @@ int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 		flags |= NVME_IOCTL_PARTITION;
 
 	if (is_ctrl_ioctl(cmd))
-		return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, mode);
-	return nvme_ns_ioctl(ns, cmd, argp, flags, mode);
+		return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
+	return nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write);
 }
 
 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct nvme_ns *ns =
 		container_of(file_inode(file)->i_cdev, struct nvme_ns, cdev);
+	bool open_for_write = file->f_mode & FMODE_WRITE;
 	void __user *argp = (void __user *)arg;
 
 	if (is_ctrl_ioctl(cmd))
-		return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, file->f_mode);
-	return nvme_ns_ioctl(ns, cmd, argp, 0, file->f_mode);
+		return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
+	return nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write);
 }
 
 static int nvme_uring_cmd_checks(unsigned int issue_flags)
@@ -800,7 +803,7 @@ int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd,
 #ifdef CONFIG_NVME_MULTIPATH
 static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
 		void __user *argp, struct nvme_ns_head *head, int srcu_idx,
-		fmode_t mode)
+		bool open_for_write)
 	__releases(&head->srcu)
 {
 	struct nvme_ctrl *ctrl = ns->ctrl;
@@ -808,7 +811,7 @@ static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
 
 	nvme_get_ctrl(ns->ctrl);
 	srcu_read_unlock(&head->srcu, srcu_idx);
-	ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, mode);
+	ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write);
 
 	nvme_put_ctrl(ctrl);
 	return ret;
@@ -818,6 +821,7 @@ int nvme_ns_head_ioctl(struct block_device *bdev, fmode_t mode,
 		unsigned int cmd, unsigned long arg)
 {
 	struct nvme_ns_head *head = bdev->bd_disk->private_data;
+	bool open_for_write = mode & FMODE_WRITE;
 	void __user *argp = (void __user *)arg;
 	struct nvme_ns *ns;
 	int srcu_idx, ret = -EWOULDBLOCK;
@@ -838,9 +842,9 @@ int nvme_ns_head_ioctl(struct block_device *bdev, fmode_t mode,
 	 */
 	if (is_ctrl_ioctl(cmd))
 		return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx,
-					mode);
+					       open_for_write);
 
-	ret = nvme_ns_ioctl(ns, cmd, argp, flags, mode);
+	ret = nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write);
 out_unlock:
 	srcu_read_unlock(&head->srcu, srcu_idx);
 	return ret;
@@ -849,6 +853,7 @@ int nvme_ns_head_ioctl(struct block_device *bdev, fmode_t mode,
 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
 		unsigned long arg)
 {
+	bool open_for_write = file->f_mode & FMODE_WRITE;
 	struct cdev *cdev = file_inode(file)->i_cdev;
 	struct nvme_ns_head *head =
 		container_of(cdev, struct nvme_ns_head, cdev);
@@ -863,9 +868,9 @@ long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
 
 	if (is_ctrl_ioctl(cmd))
 		return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx,
-				file->f_mode);
+				open_for_write);
 
-	ret = nvme_ns_ioctl(ns, cmd, argp, 0, file->f_mode);
+	ret = nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write);
 out_unlock:
 	srcu_read_unlock(&head->srcu, srcu_idx);
 	return ret;
@@ -940,7 +945,7 @@ int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags)
 }
 
 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp,
-		fmode_t mode)
+		bool open_for_write)
 {
 	struct nvme_ns *ns;
 	int ret;
@@ -964,7 +969,7 @@ static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp,
 	kref_get(&ns->kref);
 	up_read(&ctrl->namespaces_rwsem);
 
-	ret = nvme_user_cmd(ctrl, ns, argp, 0, mode);
+	ret = nvme_user_cmd(ctrl, ns, argp, 0, open_for_write);
 	nvme_put_ns(ns);
 	return ret;
 
@@ -976,16 +981,17 @@ static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp,
 long nvme_dev_ioctl(struct file *file, unsigned int cmd,
 		unsigned long arg)
 {
+	bool open_for_write = file->f_mode & FMODE_WRITE;
 	struct nvme_ctrl *ctrl = file->private_data;
 	void __user *argp = (void __user *)arg;
 
 	switch (cmd) {
 	case NVME_IOCTL_ADMIN_CMD:
-		return nvme_user_cmd(ctrl, NULL, argp, 0, file->f_mode);
+		return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write);
 	case NVME_IOCTL_ADMIN64_CMD:
-		return nvme_user_cmd64(ctrl, NULL, argp, 0, file->f_mode);
+		return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write);
 	case NVME_IOCTL_IO_CMD:
-		return nvme_dev_user_cmd(ctrl, argp, file->f_mode);
+		return nvme_dev_user_cmd(ctrl, argp, open_for_write);
 	case NVME_IOCTL_RESET:
 		if (!capable(CAP_SYS_ADMIN))
 			return -EACCES;