[PATCH =-v3 17/21] fanotify: add option to clear all fastpaths

[Eric Paris <eparis@redhat.com>]

fanotify users because of a change in decision policy may need to clear all
fastpath entries.  This simply adds a new setsockopt call which will do
exactly that.

Signed-off-by: Eric Paris <eparis@redhat.com>
---

 include/linux/fanotify.h   |    1 +
 net/fanotify/af_fanotify.c |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 14ad6f9..b7ab01f 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -89,6 +89,7 @@ struct fanotify_so_access {
 /* fanotify setsockopt optvals */
 #define FANOTIFY_SET_FASTPATH	1
 #define FANOTIFY_SEND_RESPONSE	2
+#define FANOTIFY_CLEAR_ALL_FASTPATH	3
 
 #ifdef __KERNEL__
 
diff --git a/net/fanotify/af_fanotify.c b/net/fanotify/af_fanotify.c
index eef7e2a..7c98a22 100644
--- a/net/fanotify/af_fanotify.c
+++ b/net/fanotify/af_fanotify.c
@@ -192,6 +192,9 @@ static int fan_setsockopt(struct socket *sock, int level, int optname, char __us
 			return ret;
 		ret = fanotify_process_access_response(group, data.access.cookie, data.access.response);
 		break;
+	case FANOTIFY_CLEAR_ALL_FASTPATH:
+		fanotify_fastpath_clear_group(group);
+		break;
 	default:
 		return -ENOPROTOOPT;
 	}