MFC r273131:

When vnode bypass cannot be performed on the cdev file descriptor for
read/write/poll/ioctl, call standard vnode filedescriptor fop.

3 files changed, 22 insertions, 13 deletions

diff --git a/sys/fs/deadfs/dead_vnops.c b/sys/fs/deadfs/dead_vnops.c
index 8c0ebcb..35eded0 100644
--- a/sys/fs/deadfs/dead_vnops.c
+++ b/sys/fs/deadfs/dead_vnops.c
@@ -43,9 +43,6 @@
  */
 static vop_lookup_t	dead_lookup;
 static vop_open_t	dead_open;
-static vop_poll_t	dead_poll;
-static vop_read_t	dead_read;
-static vop_write_t	dead_write;
 static vop_getwritemount_t dead_getwritemount;
 static vop_rename_t	dead_rename;
 
@@ -130,7 +127,7 @@ dead_open(ap)
  * Vnode op for read
  */
 /* ARGSUSED */
-static int
+int
 dead_read(ap)
 	struct vop_read_args /* {
 		struct vnode *a_vp;
@@ -151,7 +148,7 @@ dead_read(ap)
  * Vnode op for write
  */
 /* ARGSUSED */
-static int
+int
 dead_write(ap)
 	struct vop_write_args /* {
 		struct vnode *a_vp;
@@ -163,7 +160,7 @@ dead_write(ap)
 	return (EIO);
 }
 
-static int
+int
 dead_poll(ap)
 	struct vop_poll_args *ap;
 {
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c
index 1e3f5e8..99ad355 100644
--- a/sys/fs/devfs/devfs_vnops.c
+++ b/sys/fs/devfs/devfs_vnops.c
@@ -734,8 +734,10 @@ devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struc
 
 	fpop = td->td_fpop;
 	error = devfs_fp_check(fp, &dev, &dsw, &ref);
-	if (error)
+	if (error != 0) {
+		error = vnops.fo_ioctl(fp, com, data, cred, td);
 		return (error);
+	}
 
 	if (com == FIODTYPE) {
 		*(int *)data = dsw->d_flags & D_TYPEMASK;
@@ -1149,8 +1151,10 @@ devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
 
 	fpop = td->td_fpop;
 	error = devfs_fp_check(fp, &dev, &dsw, &ref);
-	if (error)
-		return (poll_no_poll(events));
+	if (error != 0) {
+		error = vnops.fo_poll(fp, events, cred, td);
+		return (error);
+	}
 	error = dsw->d_poll(dev, events, td);
 	td->td_fpop = fpop;
 	dev_relthread(dev, ref);
@@ -1182,8 +1186,10 @@ devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred,
 		return (EINVAL);
 	fpop = td->td_fpop;
 	error = devfs_fp_check(fp, &dev, &dsw, &ref);
-	if (error)
+	if (error != 0) {
+		error = vnops.fo_read(fp, uio, cred, flags, td);
 		return (error);
+	}
 	resid = uio->uio_resid;
 	ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
 	if (ioflag & O_DIRECT)
@@ -1657,8 +1663,10 @@ devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred,
 		return (EINVAL);
 	fpop = td->td_fpop;
 	error = devfs_fp_check(fp, &dev, &dsw, &ref);
-	if (error)
+	if (error != 0) {
+		error = vnops.fo_write(fp, uio, cred, flags, td);
 		return (error);
+	}
 	KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
 	ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
 	if (ioflag & O_DIRECT)
@@ -1740,8 +1748,9 @@ static struct vop_vector devfs_specops = {
 	.vop_mknod =		VOP_PANIC,
 	.vop_open =		devfs_open,
 	.vop_pathconf =		devfs_pathconf,
+	.vop_poll =		dead_poll,
 	.vop_print =		devfs_print,
-	.vop_read =		VOP_PANIC,
+	.vop_read =		dead_read,
 	.vop_readdir =		VOP_PANIC,
 	.vop_readlink =		VOP_PANIC,
 	.vop_reallocblks =	VOP_PANIC,
@@ -1757,7 +1766,7 @@ static struct vop_vector devfs_specops = {
 	.vop_strategy =		VOP_PANIC,
 	.vop_symlink =		VOP_PANIC,
 	.vop_vptocnp =		devfs_vptocnp,
-	.vop_write =		VOP_PANIC,
+	.vop_write =		dead_write,
 };
 
 /*
diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h
index d0e193c..2450387 100644
--- a/sys/sys/vnode.h
+++ b/sys/sys/vnode.h
@@ -756,6 +756,9 @@ int	vop_enoent(struct vop_generic_args *ap);
 int	vop_enotty(struct vop_generic_args *ap);
 int	vop_null(struct vop_generic_args *ap);
 int	vop_panic(struct vop_generic_args *ap);
+int	dead_poll(struct vop_poll_args *ap);
+int	dead_read(struct vop_read_args *ap);
+int	dead_write(struct vop_write_args *ap);
 
 /* These are called from within the actual VOPS. */
 void	vop_create_post(void *a, int rc);