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authorJason Gunthorpe <jgg@mellanox.com>2018-07-25 21:40:14 -0600
committerJason Gunthorpe <jgg@mellanox.com>2018-08-01 14:55:48 -0600
commit7452a3c745a2e7eb70d09dc5bb870759b1f26c91 (patch)
tree6299209a46563a69fba8408baf3184f0e0d8df91 /include/rdma/uverbs_types.h
parentIB/uverbs: Convert 'bool exclusive' into an enum (diff)
downloadlinux-dev-7452a3c745a2e7eb70d09dc5bb870759b1f26c91.tar.xz
linux-dev-7452a3c745a2e7eb70d09dc5bb870759b1f26c91.zip
IB/uverbs: Allow RDMA_REMOVE_DESTROY to work concurrently with disassociate
After all the recent structural changes this is now straightfoward, hoist the hw_destroy_rwsem up out of rdma_destroy_explicit and wrap it around the uobject write lock as well as the destroy. This is necessary as obtaining a write lock concurrently with uverbs_destroy_ufile_hw() will cause malfunction. After this change none of the destroy callbacks require the disassociate_srcu lock to be correct. This requires introducing a new lookup mode, UVERBS_LOOKUP_DESTROY as the IOCTL interface needs to hold an unlocked kref until all command verification is completed. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma/uverbs_types.h')
-rw-r--r--include/rdma/uverbs_types.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/rdma/uverbs_types.h b/include/rdma/uverbs_types.h
index 0676672dbbb9..f64f413cecac 100644
--- a/include/rdma/uverbs_types.h
+++ b/include/rdma/uverbs_types.h
@@ -41,6 +41,12 @@ struct uverbs_obj_type;
enum rdma_lookup_mode {
UVERBS_LOOKUP_READ,
UVERBS_LOOKUP_WRITE,
+ /*
+ * Destroy is like LOOKUP_WRITE, except that the uobject is not
+ * locked. uobj_destroy is used to convert a LOOKUP_DESTROY lock into
+ * a LOOKUP_WRITE lock.
+ */
+ UVERBS_LOOKUP_DESTROY,
};
/*
@@ -129,7 +135,6 @@ struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_obj_type *type,
struct ib_uverbs_file *ufile);
void rdma_alloc_abort_uobject(struct ib_uobject *uobj);
int __must_check rdma_alloc_commit_uobject(struct ib_uobject *uobj);
-int rdma_explicit_destroy(struct ib_uobject *uobject);
struct uverbs_obj_fd_type {
/*