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authorMartin KaFai Lau <kafai@fb.com>2018-04-19 01:56:02 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2018-04-19 22:46:25 +0300
commit60197cfb6e11ffc03aa0ed23765b2f7e70b2e2d4 (patch)
treece07ea8aa1bcf4a3c989d8a974a4413a97308c80 /include/linux/btf.h
parentf56a653c1fd13a197076dec4461c656fd2adec73 (diff)
downloadlinux-60197cfb6e11ffc03aa0ed23765b2f7e70b2e2d4.tar.xz
bpf: btf: Add BPF_OBJ_GET_INFO_BY_FD support to BTF fd
This patch adds BPF_OBJ_GET_INFO_BY_FD support to BTF fd. The original BTF data, which was used to create the BTF fd during the earlier BPF_BTF_LOAD call, will be returned. The userspace is expected to allocate buffer to info.info and the buffer size is set to info.info_len before calling BPF_OBJ_GET_INFO_BY_FD. The original BTF data is copied to the userspace buffer (info.info). Only upto the user's specified info.info_len will be copied. The original BTF data size is set to info.info_len. The userspace needs to check if it is bigger than its allocated buffer size. If it is, the userspace should realloc with the kernel-returned info.info_len and call the BPF_OBJ_GET_INFO_BY_FD again. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Alexei Starovoitov <ast@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/linux/btf.h')
-rw-r--r--include/linux/btf.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/btf.h b/include/linux/btf.h
index a7c7072535ea..a966dc6d61ee 100644
--- a/include/linux/btf.h
+++ b/include/linux/btf.h
@@ -10,9 +10,14 @@ struct btf;
struct btf_type;
union bpf_attr;
+extern const struct file_operations btf_fops;
+
void btf_put(struct btf *btf);
int btf_new_fd(const union bpf_attr *attr);
struct btf *btf_get_by_fd(int fd);
+int btf_get_info_by_fd(const struct btf *btf,
+ const union bpf_attr *attr,
+ union bpf_attr __user *uattr);
/* Figure out the size of a type_id. If type_id is a modifier
* (e.g. const), it will be resolved to find out the type with size.
*