From 4da70da23e9ba03f7f9e067fbe0eec6ebbfee401 Mon Sep 17 00:00:00 2001 From: Matan Barak Date: Thu, 3 Aug 2017 16:07:02 +0300 Subject: [PATCH] IB/core: Explicitly destroy an object while keeping uobject When some objects are destroyed, we need to extract their status at destruction. After object's destruction, this status (e.g. events_reported) relies in the uobject. 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 once uverbs_finalize_object[s] is called. Signed-off-by: Matan Barak Reviewed-by: Yishai Hadas Signed-off-by: Doug Ledford --- 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 2a2f002ac7cb..85b5ee4defa4 100644 --- a/drivers/infiniband/core/rdma_core.c +++ b/drivers/infiniband/core/rdma_core.c @@ -451,6 +451,41 @@ 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; +} + +static 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 9760b6d70744..cc04ec65588d 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 { /* -- 2.30.2