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Commit 61d1b6a4 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

bpf, maps: add release callback 



Add a release callback for maps that is invoked when the last
reference to its struct file is gone and the struct file about
to be released by vfs. The handler will be used by fd array maps.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b478af0c

include/linux/bpf.h

+2 −1
Original line number Diff line number Diff line
@@ -19,7 +19,8 @@ struct bpf_map; 
struct bpf_map_ops {

	/* funcs callable from userspace (via syscall) */

	struct bpf_map *(*map_alloc)(union bpf_attr *attr);

	void (*map_free)(struct bpf_map *);

	void (*map_release)(struct bpf_map *map, struct file *map_file);

	void (*map_free)(struct bpf_map *map);

	int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);



	/* funcs callable from userspace and from eBPF programs */

kernel/bpf/syscall.c

+6 −1
Original line number Diff line number Diff line
@@ -124,7 +124,12 @@ void bpf_map_put_with_uref(struct bpf_map *map) 


static int bpf_map_release(struct inode *inode, struct file *filp)

{

	bpf_map_put_with_uref(filp->private_data);

	struct bpf_map *map = filp->private_data;



	if (map->ops->map_release)

		map->ops->map_release(map, filp);



	bpf_map_put_with_uref(map);

	return 0;

}