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authorLogan Gunthorpe <logang@deltatee.com>2020-07-24 20:25:15 +0300
committerChristoph Hellwig <hch@lst.de>2020-07-29 08:45:21 +0300
commitf783f444ceaa7eab043a7a5ae0e34c68743c0358 (patch)
tree1ea6552838f621e0704f72e6e5be5600ff6796c2 /drivers/nvme
parent17365ae6975c7f7494a2d1cd0bf18b5ed238e072 (diff)
downloadlinux-f783f444ceaa7eab043a7a5ae0e34c68743c0358.tar.xz
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: 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>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/core.c23
-rw-r--r--drivers/nvme/host/nvme.h1
2 files changed, 24 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 8296c1248f87..c44316c5018f 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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:
*/
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 4e3bc4b66c57..5af59a9bac53 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -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 */