leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

nvme: introduce nvme_ctrl_get_by_path()

Browse Source 
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>
This commit is contained in:
Logan Gunthorpe 2020-07-24 11:25:15 -06:00 committed by Christoph Hellwig
parent 17365ae697
commit f783f444ce
2 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/nvme/host/core.c
View File

@ -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:
*/

1
drivers/nvme/host/nvme.h
View File

@ -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 */