Add post-VOP hooks for VOP_DELETEEXTATTR() and VOP_SETEXTATTR() and use

these to trigger a NOTE_ATTRIB EVFILT_VNODE kevent when the extended
attributes of a vnode are changed.

Note that OS X already implements this behavior.

Reviewed by:	rwatson
MFC after:	2 weeks

1 files changed, 18 insertions, 0 deletions

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 2872f77..544b1cc 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -4033,6 +4033,15 @@ vop_create_post(void *ap, int rc)
 }
 
 void
+vop_deleteextattr_post(void *ap, int rc)
+{
+	struct vop_setattr_args *a = ap;
+
+	if (!rc)
+		VFS_KNOTE_LOCKED(a->a_vp, NOTE_ATTRIB);
+}
+
+void
 vop_link_post(void *ap, int rc)
 {
 	struct vop_link_args *a = ap;
@@ -4114,6 +4123,15 @@ vop_setattr_post(void *ap, int rc)
 }
 
 void
+vop_setextattr_post(void *ap, int rc)
+{
+	struct vop_setattr_args *a = ap;
+
+	if (!rc)
+		VFS_KNOTE_LOCKED(a->a_vp, NOTE_ATTRIB);
+}
+
+void
 vop_symlink_post(void *ap, int rc)
 {
 	struct vop_symlink_args *a = ap;