| Message ID | 20190820135346.7593-1-quentin.monnet@netronome.com |
|---|---|
| State | Accepted |
| Delegated to: | BPF Maintainers |
| Headers | show |
| Series | [bpf-next,v2] bpf: add BTF ids in procfs for file descriptors to BTF objects | expand |
On 8/20/19 3:53 PM, Quentin Monnet wrote: > Implement the show_fdinfo hook for BTF FDs file operations, and make it > print the id of the BTF object. This allows for a quick retrieval of the > BTF id from its FD; or it can help understanding what type of object > (BTF) the file descriptor points to. > > v2: > - Do not expose data_size, only btf_id, in FD info. > > Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> > Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Applied, thanks!
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 5fcc7a17eb5a..6b403dc18486 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -3376,6 +3376,15 @@ void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj, btf_type_ops(t)->seq_show(btf, t, type_id, obj, 0, m); } +#ifdef CONFIG_PROC_FS +static void bpf_btf_show_fdinfo(struct seq_file *m, struct file *filp) +{ + const struct btf *btf = filp->private_data; + + seq_printf(m, "btf_id:\t%u\n", btf->id); +} +#endif + static int btf_release(struct inode *inode, struct file *filp) { btf_put(filp->private_data); @@ -3383,6 +3392,9 @@ static int btf_release(struct inode *inode, struct file *filp) } const struct file_operations btf_fops = { +#ifdef CONFIG_PROC_FS + .show_fdinfo = bpf_btf_show_fdinfo, +#endif .release = btf_release, };