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authorDaniel Borkmann <daniel@iogearbox.net>2016-06-15 22:47:12 +0200
committerDavid S. Miller <davem@davemloft.net>2016-06-15 23:42:57 -0700
commit61d1b6a42fec61c5065f54cc62cef02b483c69fb (patch)
treeeb4b02ef08e8f73fd394fadb0b5e15008394c142 /kernel
parentb478af0cd7957faca83779fe6832abae163f7159 (diff)
downloadlinux-61d1b6a42fec61c5065f54cc62cef02b483c69fb.tar.bz2
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: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/syscall.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 46ecce4b79ed..fc3adcd064b1 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -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;
}