[PATCH bpf-next v6 3/4] bpf: Handle show_fdinfo for the parameterized task BPF iterators

[Kui-Feng Lee <kuifeng@xxxxxx>]

Show information of iterators in the respective files under
/proc/<pid>/fdinfo/.

Signed-off-by: Kui-Feng Lee <kuifeng@xxxxxx>
---
 kernel/bpf/task_iter.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index 927b3a1cf354..5303eddb264b 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -611,6 +611,11 @@ static int bpf_iter_fill_link_info(const struct bpf_iter_aux_info *aux, struct b
 	return 0;
 }
 
+static void bpf_iter_task_show_fdinfo(const struct bpf_iter_aux_info *aux, struct seq_file *seq)
+{
+	seq_printf(seq, "task_type:\t%d\npid:\t%d\n", aux->task.type, aux->task.pid);
+}
+
 static struct bpf_iter_reg task_reg_info = {
 	.target			= "task",
 	.attach_target		= bpf_iter_attach_task,
@@ -622,6 +627,7 @@ static struct bpf_iter_reg task_reg_info = {
 	},
 	.seq_info		= &task_seq_info,
 	.fill_link_info		= bpf_iter_fill_link_info,
+	.show_fdinfo		= bpf_iter_task_show_fdinfo,
 };
 
 static const struct bpf_iter_seq_info task_file_seq_info = {
@@ -644,6 +650,7 @@ static struct bpf_iter_reg task_file_reg_info = {
 	},
 	.seq_info		= &task_file_seq_info,
 	.fill_link_info		= bpf_iter_fill_link_info,
+	.show_fdinfo		= bpf_iter_task_show_fdinfo,
 };
 
 static const struct bpf_iter_seq_info task_vma_seq_info = {
@@ -666,6 +673,7 @@ static struct bpf_iter_reg task_vma_reg_info = {
 	},
 	.seq_info		= &task_vma_seq_info,
 	.fill_link_info		= bpf_iter_fill_link_info,
+	.show_fdinfo		= bpf_iter_task_show_fdinfo,
 };
 
 BPF_CALL_5(bpf_find_vma, struct task_struct *, task, u64, start,
-- 
2.30.2