nvme_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).
The purpose of this function is to support NVMe-OF target passthru. Signed-off-by: Logan Gunthorpe <[email protected]> --- drivers/nvme/host/core.c | 23 +++++++++++++++++++++++ drivers/nvme/host/nvme.h | 2 ++ 2 files changed, 25 insertions(+) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 00399c3536fa..61e7b016ec36 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -2816,6 +2816,29 @@ static const struct file_operations nvme_dev_fops = { .compat_ioctl = nvme_dev_ioctl, }; +struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path) +{ + struct nvme_ctrl *ctrl; + struct cdev *cdev; + + cdev = cdev_get_by_path(path); + if (IS_ERR(cdev)) + return ERR_CAST(cdev); + + if (cdev->ops != &nvme_dev_fops) { + ctrl = ERR_PTR(-EINVAL); + goto out_cdev_put; + } + + ctrl = container_of(cdev, struct nvme_ctrl, cdev); + nvme_get_ctrl(ctrl); + +out_cdev_put: + cdev_put(cdev); + return ctrl; +} +EXPORT_SYMBOL_GPL(nvme_ctrl_get_by_path); + static ssize_t nvme_sysfs_reset(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index da3d130773c4..a19bd0091de6 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -484,6 +484,8 @@ int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, extern const struct attribute_group *nvme_ns_id_attr_groups[]; extern const struct block_device_operations nvme_ns_head_ops; +struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path); + #ifdef CONFIG_NVME_MULTIPATH bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl); void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns, -- 2.20.1
