IB/core: Expose ib_ucontext from a given ib_uverbs_file

Drivers that use the IOCTL API may have the ib_uverbs_file and need a
way to get the related ib_ucontext from it, this is enabled by this
patch.

Downstream patches from this series will use it.
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/uverbs_main.c

@@ -138,6 +138,12 @@ static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
 static void ib_uverbs_add_one(struct ib_device *device);
 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 
+struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile)
+{
+	return ufile->ucontext;
+}
+EXPORT_SYMBOL(ib_uverbs_get_ucontext);
+
 int uverbs_dealloc_mw(struct ib_mw *mw)
 {
 	struct ib_pd *pd = mw->pd;

include/rdma/ib_verbs.h

@@ -4120,4 +4120,6 @@ ib_get_vector_affinity(struct ib_device *device, int comp_vector)
  */
 void rdma_roce_rescan_device(struct ib_device *ibdev);
 
+struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile);
+
 #endif /* IB_VERBS_H */