nvme: introduce nvme_ctrl_get_by_path() (f783f444) · Commits · 戴 / test

nvme_ctrl_get_by_path() is analogous to blkdev_get_by_path() except it gets a struct nvme_ctrl from the path to its char dev (/dev/nvme0). It makes use of filp_open() to open the file and uses the private data to obtain a pointer to the struct nvme_ctrl. If the fops of the file do not match, -EINVAL is returned. The purpose of this function is to support NVMe-OF target passthru and is exported under the NVME_TARGET_PASSTHRU namespace. Signed-off-by:

Logan Gunthorpe <logang@deltatee.com> Reviewed-by:

Keith Busch <kbusch@kernel.org> Reviewed-by:

Sagi Grimberg <sagi@grimberg.me> Reviewed-by:

Max Gurtovoy <maxg@mellanox.com> Signed-off-by:

Christoph Hellwig <hch@lst.de>

drivers/nvme/host/core.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -4590,6 +4590,29 @@ void nvme_sync_queues(struct nvme_ctrl *ctrl)
		}
		EXPORT_SYMBOL_GPL(nvme_sync_queues);

		struct nvme_ctrl nvme_ctrl_get_by_path(const char path)
		{
		struct nvme_ctrl *ctrl;
		struct file *f;

		f = filp_open(path, O_RDWR, 0);
		if (IS_ERR(f))
		return ERR_CAST(f);

		if (f->f_op != &nvme_dev_fops) {
		ctrl = ERR_PTR(-EINVAL);
		goto out_close;
		}

		ctrl = f->private_data;
		nvme_get_ctrl(ctrl);

		out_close:
		filp_close(f, NULL);
		return ctrl;
		}
		EXPORT_SYMBOL_NS_GPL(nvme_ctrl_get_by_path, NVME_TARGET_PASSTHRU);

		/*
		* Check we didn't inadvertently grow the command structure sizes:
		*/

drivers/nvme/host/nvme.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -793,5 +793,6 @@ static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { }
		u32 nvme_command_effects(struct nvme_ctrl ctrl, struct nvme_ns ns,
		u8 opcode);
		void nvme_execute_passthru_rq(struct request *rq);
		struct nvme_ctrl nvme_ctrl_get_by_path(const char path);

		#endif /* _NVME_H */

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