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bpf: Refactor bpf_iter_reg to have separate seq_info member

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There is no functionality change for this patch.
Struct bpf_iter_reg is used to register a bpf_iter target,
which includes information for both prog_load, link_create
and seq_file creation.

This patch puts fields related seq_file creation into
a different structure. This will be useful for map
elements iterator where one iterator covers different
map types and different map types may have different
seq_ops, init/fini private_data function and
private_data size.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200723184109.590030-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2020-07-23 11:41:09 -07:00 • committed by Alexei Starovoitov
parent a228a64fc1
commit 14fc6bd6b7
9 changed files with 64 additions and 29 deletions
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16
kernel/bpf/task_iter.c
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@ -319,25 +319,32 @@ BTF_ID_LIST(btf_task_file_ids)
BTF_ID(struct, task_struct)
BTF_ID(struct, file)
static struct bpf_iter_reg task_reg_info = {
.target = "task",
static const struct bpf_iter_seq_info task_seq_info = {
.seq_ops = &task_seq_ops,
.init_seq_private = init_seq_pidns,
.fini_seq_private = fini_seq_pidns,
.seq_priv_size = sizeof(struct bpf_iter_seq_task_info),
};
static struct bpf_iter_reg task_reg_info = {
.target = "task",
.ctx_arg_info_size = 1,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__task, task),
PTR_TO_BTF_ID_OR_NULL },
},
.seq_info = &task_seq_info,
};
static struct bpf_iter_reg task_file_reg_info = {
.target = "task_file",
static const struct bpf_iter_seq_info task_file_seq_info = {
.seq_ops = &task_file_seq_ops,
.init_seq_private = init_seq_pidns,
.fini_seq_private = fini_seq_pidns,
.seq_priv_size = sizeof(struct bpf_iter_seq_task_file_info),
};
static struct bpf_iter_reg task_file_reg_info = {
.target = "task_file",
.ctx_arg_info_size = 2,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__task_file, task),
@ -345,6 +352,7 @@ static struct bpf_iter_reg task_file_reg_info = {
{ offsetof(struct bpf_iter__task_file, file),
PTR_TO_BTF_ID_OR_NULL },
},
.seq_info = &task_file_seq_info,
};
static int __init task_iter_init(void)