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UPSTREAM: bpf: Add d_path helper

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Adding d_path helper function that returns full path for
given 'struct path' object, which needs to be the kernel
BTF 'path' object. The path is returned in buffer provided
'buf' of size 'sz' and is zero terminated.

  bpf_d_path(&file->f_path, buf, size);

The helper calls directly d_path function, so there's only
limited set of function it can be called from. Adding just
very modest set for the start.

Updating also bpf.h tools uapi header and adding 'path' to
bpf_helpers_doc.py script.

Change-Id: Ic530ea9da08f5f6479bfd7a5b7c8c26d7d4aaa66
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: KP Singh <kpsingh@google.com>
Link: https://lore.kernel.org/bpf/20200825192124.710397-11-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2020-08-25 21:21:20 +02:00 • committed by basamaryan
commit 73ea92cc7a
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4 changed files with 78 additions and 0 deletions
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14
tools/include/uapi/linux/bpf.h
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@ -3427,6 +3427,7 @@ union bpf_attr {
*
* **-EPERM** This helper cannot be used under the
* current sock_ops->op.
*
* void *bpf_inode_storage_get(struct bpf_map *map, void *inode, void *value, u64 flags)
* Description
* Get a bpf_local_storage from an *inode*.
@ -3462,6 +3463,18 @@ union bpf_attr {
* 0 on success.
*
* **-ENOENT** if the bpf_local_storage cannot be found.
*
* long bpf_d_path(struct path *path, char *buf, u32 sz)
* Description
* Return full path for given 'struct path' object, which
* needs to be the kernel BTF 'path' object. The path is
* returned in the provided buffer 'buf' of size 'sz' and
* is zero terminated.
*
* Return
* On success, the strictly positive length of the string,
* including the trailing NUL character. On error, a negative
* value.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@ -3611,6 +3624,7 @@ union bpf_attr {
FN(reserve_hdr_opt), \
FN(inode_storage_get), \
FN(inode_storage_delete), \
FN(d_path), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper