linux/kernel/bpf/bpf_inode_storage.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 Facebook
 * Copyright 2020 Google LLC.
 */

#include <linux/rculist.h>
#include <linux/list.h>
#include <linux/hash.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/bpf.h>
#include <linux/bpf_local_storage.h>
#include <net/sock.h>
#include <uapi/linux/sock_diag.h>
#include <uapi/linux/btf.h>
#include <linux/bpf_lsm.h>
#include <linux/btf_ids.h>
#include <linux/fdtable.h>
#include <linux/rcupdate_trace.h>

DEFINE_BPF_STORAGE_CACHE(…);

static struct bpf_local_storage __rcu **
inode_storage_ptr(void *owner)
{ … }

static struct bpf_local_storage_data *inode_storage_lookup(struct inode *inode,
							   struct bpf_map *map,
							   bool cacheit_lockit)
{ … }

void bpf_inode_storage_free(struct inode *inode)
{ … }

static void *bpf_fd_inode_storage_lookup_elem(struct bpf_map *map, void *key)
{ … }

static long bpf_fd_inode_storage_update_elem(struct bpf_map *map, void *key,
					     void *value, u64 map_flags)
{ … }

static int inode_storage_delete(struct inode *inode, struct bpf_map *map)
{ … }

static long bpf_fd_inode_storage_delete_elem(struct bpf_map *map, void *key)
{ … }

/* *gfp_flags* is a hidden argument provided by the verifier */
BPF_CALL_5(bpf_inode_storage_get, struct bpf_map *, map, struct inode *, inode,
	   void *, value, u64, flags, gfp_t, gfp_flags)
{ … }

BPF_CALL_2(bpf_inode_storage_delete,
	   struct bpf_map *, map, struct inode *, inode)
{ … }

static int notsupp_get_next_key(struct bpf_map *map, void *key,
				void *next_key)
{ … }

static struct bpf_map *inode_storage_map_alloc(union bpf_attr *attr)
{ … }

static void inode_storage_map_free(struct bpf_map *map)
{ … }

const struct bpf_map_ops inode_storage_map_ops = …;

BTF_ID_LIST_SINGLE(bpf_inode_storage_btf_ids, struct, inode)

const struct bpf_func_proto bpf_inode_storage_get_proto = …;

const struct bpf_func_proto bpf_inode_storage_delete_proto = …;