Commit f783f444 authored by Logan Gunthorpe's avatar Logan Gunthorpe Committed by Christoph Hellwig

nvme: introduce nvme_ctrl_get_by_path()

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: default avatarLogan Gunthorpe <logang@deltatee.com>
Reviewed-by: default avatarKeith Busch <kbusch@kernel.org>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Reviewed-by: default avatarMax Gurtovoy <maxg@mellanox.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 17365ae6
...@@ -4590,6 +4590,29 @@ void nvme_sync_queues(struct nvme_ctrl *ctrl) ...@@ -4590,6 +4590,29 @@ void nvme_sync_queues(struct nvme_ctrl *ctrl)
} }
EXPORT_SYMBOL_GPL(nvme_sync_queues); 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: * Check we didn't inadvertently grow the command structure sizes:
*/ */
......
...@@ -793,5 +793,6 @@ static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { } ...@@ -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, u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
u8 opcode); u8 opcode);
void nvme_execute_passthru_rq(struct request *rq); void nvme_execute_passthru_rq(struct request *rq);
struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path);
#endif /* _NVME_H */ #endif /* _NVME_H */
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