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| author |   Jason Gunthorpe <jgg@mellanox.com> | 2018-07-25 21:40:14 -0600 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-08-01 14:55:48 -0600 |
| commit | 7452a3c745a2e7eb70d09dc5bb870759b1f26c91 (patch) | |
| tree | 6299209a46563a69fba8408baf3184f0e0d8df91 /include | |
| parent | IB/uverbs: Convert 'bool exclusive' into an enum (diff) | |
| download | linux-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')
| -rw-r--r-- | include/rdma/uverbs_types.h | 7 |
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 { /* |