Yonghong Song ae24345da5
bpf: Implement an interface to register bpf_iter targets ...
The target can call bpf_iter_reg_target() to register itself.
The needed information:
target: target name
seq_ops: the seq_file operations for the target
init_seq_private target callback to initialize seq_priv during file open
fini_seq_private target callback to clean up seq_priv during file release
seq_priv_size: the private_data size needed by the seq_file
operations
The target name represents a target which provides a seq_ops
for iterating objects.
The target can provide two callback functions, init_seq_private
and fini_seq_private, called during file open/release time.
For example, /proc/net/{tcp6, ipv6_route, netlink, ...}, net
name space needs to be setup properly during file open and
released properly during file release.
Function bpf_iter_unreg_target() is also implemented to unregister
a particular target.
Signed-off-by: Yonghong Song <yhs@fb.com >
Signed-off-by: Alexei Starovoitov <ast@kernel.org >
Acked-by: Andrii Nakryiko <andriin@fb.com >
Link: https://lore.kernel.org/bpf/20200509175859.2474669-1-yhs@fb.com
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