When some objects are destroyed, we need to extract their status at
destruction. In order to have the latest and correct status, the
underlying object should be destroyed, but we should keep the uobject
alive and read this information off the uobject.
We introduce a rdma_explicit_destroy function. This function destroys
the class type object (for example, the IDR class type which destroys
the underlying object as well) and then convert the uobject to be of a
null class type. This uobject will then be destroyed as any other
uobject.
Signed-off-by: Matan Barak <matanb@xxxxxxxxxxxx>
---
drivers/infiniband/core/rdma_core.c | 35 +++++++++++++++++++++++++++++++++++
include/rdma/uverbs_types.h | 1 +
2 files changed, 36 insertions(+)
diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c
index a6e35b3..c456107 100644
--- a/drivers/infiniband/core/rdma_core.c
+++ b/drivers/infiniband/core/rdma_core.c
@@ -450,6 +450,41 @@ int __must_check rdma_remove_commit_uobject(struct ib_uobject *uobj)
return ret;
}
+static int null_obj_type_class_remove_commit(struct ib_uobject *uobj,
+ enum rdma_remove_reason why)
+{
+ return 0;
+}
+
+const struct uverbs_obj_type null_obj_type = {
+ .type_class = &((const struct uverbs_obj_type_class){
+ .remove_commit = null_obj_type_class_remove_commit,
+ /* be cautious */
+ .needs_kfree_rcu = true}),
+};
+
+int rdma_explicit_destroy(struct ib_uobject *uobject)
+{
+ int ret;
+ struct ib_ucontext *ucontext = uobject->context;
+
+ /* Cleanup is running. Calling this should have been impossible */
+ if (!down_read_trylock(&ucontext->cleanup_rwsem)) {
+ WARN(true, "ib_uverbs: Cleanup is running while removing an uobject\n");
+ return 0;
+ }
+ lockdep_check(uobject, true);
+ ret = uobject->type->type_class->remove_commit(uobject,
+ RDMA_REMOVE_DESTROY);
+ if (ret)
+ return ret;
+
+ uobject->type = &null_obj_type;
+
+ up_read(&ucontext->cleanup_rwsem);
+ return 0;
+}
+
static void alloc_commit_idr_uobject(struct ib_uobject *uobj)
{
uverbs_uobject_add(uobj);
diff --git a/include/rdma/uverbs_types.h b/include/rdma/uverbs_types.h
index 9760b6d..cc04ec6 100644
--- a/include/rdma/uverbs_types.h
+++ b/include/rdma/uverbs_types.h
@@ -129,6 +129,7 @@ struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_obj_type *type,
void rdma_alloc_abort_uobject(struct ib_uobject *uobj);
int __must_check rdma_remove_commit_uobject(struct ib_uobject *uobj);
int rdma_alloc_commit_uobject(struct ib_uobject *uobj);
+int rdma_explicit_destroy(struct ib_uobject *uobject);
struct uverbs_obj_fd_type {
/*
--
1.8.3.1
--
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