1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 /* "undefine" structs in vmlinux.h, because we "override" them below */ 4 #define bpf_iter_meta bpf_iter_meta___not_used 5 #define bpf_iter__task_file bpf_iter__task_file___not_used 6 #include "vmlinux.h" 7 #undef bpf_iter_meta 8 #undef bpf_iter__task_file 9 #include <bpf/bpf_helpers.h> 10 #include <bpf/bpf_tracing.h> 11 12 char _license[] SEC("license") = "GPL"; 13 14 struct bpf_iter_meta { 15 struct seq_file *seq; 16 __u64 session_id; 17 __u64 seq_num; 18 } __attribute__((preserve_access_index)); 19 20 struct bpf_iter__task_file { 21 struct bpf_iter_meta *meta; 22 struct task_struct *task; 23 __u32 fd; 24 struct file *file; 25 } __attribute__((preserve_access_index)); 26 27 SEC("iter/task_file") 28 int dump_task_file(struct bpf_iter__task_file *ctx) 29 { 30 struct seq_file *seq = ctx->meta->seq; 31 struct task_struct *task = ctx->task; 32 __u32 fd = ctx->fd; 33 struct file *file = ctx->file; 34 35 if (task == (void *)0 || file == (void *)0) 36 return 0; 37 38 if (ctx->meta->seq_num == 0) 39 BPF_SEQ_PRINTF(seq, " tgid gid fd file\n"); 40 41 BPF_SEQ_PRINTF(seq, "%8d %8d %8d %lx\n", task->tgid, task->pid, fd, 42 (long)file->f_op); 43 return 0; 44 } 45