bpf: add show_fdinfo handler for maps
Add a handler for show_fdinfo() to be used by the anon-inodes backend for eBPF maps, and dump the map specification there. Not only useful for admins, but also it provides a minimal way to compare specs from ELF vs pinned object. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 21 additions and 1 deletions
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@ -93,6 +93,23 @@ void bpf_map_put(struct bpf_map *map)
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}
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}
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}
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}
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#ifdef CONFIG_PROC_FS
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static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
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{
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const struct bpf_map *map = filp->private_data;
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seq_printf(m,
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"map_type:\t%u\n"
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"key_size:\t%u\n"
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"value_size:\t%u\n"
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"max_entries:\t%u\n",
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map->map_type,
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map->key_size,
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map->value_size,
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map->max_entries);
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}
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#endif
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static int bpf_map_release(struct inode *inode, struct file *filp)
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static int bpf_map_release(struct inode *inode, struct file *filp)
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{
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{
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struct bpf_map *map = filp->private_data;
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struct bpf_map *map = filp->private_data;
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@ -108,7 +125,10 @@ static int bpf_map_release(struct inode *inode, struct file *filp)
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}
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}
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static const struct file_operations bpf_map_fops = {
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static const struct file_operations bpf_map_fops = {
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.release = bpf_map_release,
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#ifdef CONFIG_PROC_FS
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.show_fdinfo = bpf_map_show_fdinfo,
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#endif
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.release = bpf_map_release,
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};
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};
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int bpf_map_new_fd(struct bpf_map *map)
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int bpf_map_new_fd(struct bpf_map *map)
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