kcmp(2): implement for generic file types

Reviewed by:	brooks, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D43518

sys/kern/kern_event.c

@@ -139,6 +139,7 @@ static struct fileops kqueueops = {
 	.fo_chmod = invfo_chmod,
 	.fo_chown = invfo_chown,
 	.fo_sendfile = invfo_sendfile,
+	.fo_cmp = file_kcmp_generic,
 	.fo_fill_kinfo = kqueue_fill_kinfo,
 };
 

sys/kern/sys_eventfd.c

@@ -76,6 +76,7 @@ static struct fileops eventfdops = {
 	.fo_chown = invfo_chown,
 	.fo_sendfile = invfo_sendfile,
 	.fo_fill_kinfo = eventfd_fill_kinfo,
+	.fo_cmp = file_kcmp_generic,
 	.fo_flags = DFLAG_PASSABLE
 };
 

sys/kern/sys_generic.c

@@ -2158,3 +2158,11 @@ sys_kcmp(struct thread *td, struct kcmp_args *uap)
 	return (kern_kcmp(td, uap->pid1, uap->pid2, uap->type,
 	    uap->idx1, uap->idx2));
 }
+
+int
+file_kcmp_generic(struct file *fp1, struct file *fp2, struct thread *td)
+{
+	if (fp1->f_type != fp2->f_type)
+		return (3);
+	return (kcmp_cmp((uintptr_t)fp1->f_data, (uintptr_t)fp2->f_data));
+}

sys/kern/sys_pipe.c

@@ -165,6 +165,7 @@ struct fileops pipeops = {
 	.fo_chown = pipe_chown,
 	.fo_sendfile = invfo_sendfile,
 	.fo_fill_kinfo = pipe_fill_kinfo,
+	.fo_cmp = file_kcmp_generic,
 	.fo_flags = DFLAG_PASSABLE
 };
 

sys/kern/sys_socket.c

@@ -109,6 +109,7 @@ struct fileops	socketops = {
 	.fo_sendfile = invfo_sendfile,
 	.fo_fill_kinfo = soo_fill_kinfo,
 	.fo_aio_queue = soo_aio_queue,
+	.fo_cmp = file_kcmp_generic,
 	.fo_flags = DFLAG_PASSABLE
 };
 

sys/kern/sys_timerfd.c

@@ -371,6 +371,7 @@ static struct fileops timerfdops = {
 	.fo_chown = invfo_chown,
 	.fo_sendfile = invfo_sendfile,
 	.fo_fill_kinfo = timerfd_fill_kinfo,
+	.fo_cmp = file_kcmp_generic,
 	.fo_flags = DFLAG_PASSABLE,
 };
 

sys/kern/tty_pts.c

@@ -610,6 +610,7 @@ static struct fileops ptsdev_ops = {
 	.fo_chown	= invfo_chown,
 	.fo_sendfile	= invfo_sendfile,
 	.fo_fill_kinfo	= ptsdev_fill_kinfo,
+	.fo_cmp		= file_kcmp_generic,
 	.fo_flags	= DFLAG_PASSABLE,
 };
 

sys/kern/uipc_mqueue.c

@@ -2661,6 +2661,7 @@ static struct fileops mqueueops = {
 	.fo_chown		= mqf_chown,
 	.fo_sendfile		= invfo_sendfile,
 	.fo_fill_kinfo		= mqf_fill_kinfo,
+	.fo_cmp			= file_kcmp_generic,
 	.fo_flags		= DFLAG_PASSABLE,
 };
 

sys/kern/uipc_sem.c

@@ -153,6 +153,7 @@ static struct fileops ksem_ops = {
 	.fo_chown = ksem_chown,
 	.fo_sendfile = invfo_sendfile,
 	.fo_fill_kinfo = ksem_fill_kinfo,
+	.fo_cmp = file_kcmp_generic,
 	.fo_flags = DFLAG_PASSABLE
 };
 

sys/kern/uipc_shm.c

@@ -169,6 +169,7 @@ struct fileops shm_ops = {
 	.fo_add_seals = shm_add_seals,
 	.fo_fallocate = shm_fallocate,
 	.fo_fspacectl = shm_fspacectl,
+	.fo_cmp = file_kcmp_generic,
 	.fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE,
 };
 

sys/sys/file.h

@@ -279,6 +279,7 @@ fo_seek_t	vn_seek;
 fo_fill_kinfo_t	vn_fill_kinfo;
 fo_kqfilter_t	vn_kqfilter_opath;
 int vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif);
+int file_kcmp_generic(struct file *fp1, struct file *fp2, struct thread *td);
 
 void finit(struct file *, u_int, short, void *, struct fileops *);
 void finit_vnode(struct file *, u_int, void *, struct fileops *);