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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org nvme_ctrl_get_by_path() is analagous 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. Signed-off-by: Logan Gunthorpe Reviewed-by: Max Gurtovoy Reviewed-by: Sagi Grimberg --- drivers/nvme/host/core.c | 31 +++++++++++++++++++++++++++++++ drivers/nvme/host/nvme.h | 6 ++++++ 2 files changed, 37 insertions(+) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 817ab76d2838..6e7d5cb43a06 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4572,6 +4572,37 @@ void nvme_sync_queues(struct nvme_ctrl *ctrl) } EXPORT_SYMBOL_GPL(nvme_sync_queues); +#ifdef CONFIG_NVME_TARGET_PASSTHRU +/* + * The exports that follow within this ifdef are only for + * use by the nvmet-passthru and should not be used for + * other things. + */ + +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_GPL(nvme_ctrl_get_by_path); +#endif /* CONFIG_NVME_TARGET_PASSTHRU */ + /* * Check we didn't inadvertently grow the command structure sizes: */ diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 13ca90bcd352..485492a98ef5 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -763,4 +763,10 @@ void nvme_hwmon_init(struct nvme_ctrl *ctrl); static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { } #endif +/* + * These functions are only for use by nvmet-passthru and are only exported + * if CONFIG_NVME_TARGET_PASSTHRU is set. + */ +struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path); + #endif /* _NVME_H */ -- 2.20.1 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme