Messages in this thread Patch in this message | | | From | Logan Gunthorpe <> | Date | Fri, 24 Jul 2020 11:25:15 -0600 | Subject | [PATCH v16 4/9] nvme-core: Introduce nvme_ctrl_get_by_path() |
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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: Max Gurtovoy <maxg@mellanox.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> --- drivers/nvme/host/core.c | 23 +++++++++++++++++++++++ drivers/nvme/host/nvme.h | 1 + 2 files changed, 24 insertions(+)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index ccca36f881d6..35b1d13db2e9 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4575,6 +4575,29 @@ 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: */ diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index c43e0e4e0b97..4bec44ab5a96 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -787,5 +787,6 @@ 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 */ -- 2.20.1
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