Documentation/bpf/map_cgrp_storage.rst

9 storage for cgroups. It is only available with ``CONFIG_CGROUPS``.
21 To access the storage in a program, use ``bpf_cgrp_storage_get``::
26 a new local storage will be created if one does not exist.
28 The local storage can be removed with ``bpf_cgrp_storage_delete``::
81 The old cgroup storage map ``BPF_MAP_TYPE_CGROUP_STORAGE`` has been marked as
91 (2). ``BPF_MAP_TYPE_CGRP_STORAGE`` supports local storage for more than one
95 (3). ``BPF_MAP_TYPE_CGROUP_STORAGE_DEPRECATED`` allocates local storage at attach time so
96      ``bpf_get_local_storage()`` always returns non-NULL local storage.
97      ``BPF_MAP_TYPE_CGRP_STORAGE`` allocates local storage at runtime so
98      it is possible that ``bpf_cgrp_storage_get()`` may return null local storage.
99      To avoid such null local storage issue, user space can do
100      ``bpf_map_update_elem()`` to pre-allocate local storage before a BPF program
103 (4). ``BPF_MAP_TYPE_CGRP_STORAGE`` supports deleting local storage by a BPF program
104      while ``BPF_MAP_TYPE_CGROUP_STORAGE_DEPRECATED`` only deletes storage during