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      1 /*	$NetBSD: dead_vfsops.c,v 1.13 2022/10/26 23:39:43 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Juergen Hannken-Illjes.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: dead_vfsops.c,v 1.13 2022/10/26 23:39:43 riastradh Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/vnode.h>
     38 #include <sys/mount.h>
     39 
     40 #include <miscfs/deadfs/deadfs.h>
     41 #include <miscfs/specfs/specdev.h>
     42 
     43 VFS_PROTOS(dead);
     44 
     45 static void dead_panic(void);
     46 
     47 static const struct vnodeopv_desc * const dead_vnodeopv_descs[] = {
     48 	&dead_vnodeop_opv_desc,
     49 	NULL
     50 };
     51 
     52 struct mount *dead_rootmount;
     53 
     54 struct vfsops dead_vfsops = {
     55 	.vfs_name = "dead",
     56 	.vfs_min_mount_data = 0,
     57 	.vfs_mount = (void *)dead_panic,
     58 	.vfs_start = (void *)dead_panic,
     59 	.vfs_unmount = (void *)dead_panic,
     60 	.vfs_root = (void *)dead_panic,
     61 	.vfs_quotactl = (void *)dead_panic,
     62 	.vfs_statvfs = (void *)eopnotsupp,
     63 	.vfs_sync = (void *)dead_panic,
     64 	.vfs_vget = (void *)dead_panic,
     65 	.vfs_loadvnode = (void *)dead_panic,
     66 	.vfs_newvnode = dead_newvnode,
     67 	.vfs_fhtovp = (void *)dead_panic,
     68 	.vfs_vptofh = (void *)eopnotsupp,
     69 	.vfs_init = (void *)dead_panic,
     70 	.vfs_reinit = (void *)dead_panic,
     71 	.vfs_done = (void *)dead_panic,
     72 	.vfs_mountroot = (void *)dead_panic,
     73 	.vfs_snapshot = (void *)dead_panic,
     74 	.vfs_extattrctl = (void *)dead_panic,
     75 	.vfs_suspendctl = (void *)dead_panic,
     76 	.vfs_renamelock_enter = (void *)dead_panic,
     77 	.vfs_renamelock_exit = (void *)dead_panic,
     78 	.vfs_fsync = (void *)eopnotsupp,
     79 	.vfs_opv_descs = dead_vnodeopv_descs
     80 };
     81 
     82 static void
     83 dead_panic(void)
     84 {
     85 
     86 	panic("dead fs operation used");
     87 }
     88 
     89 /*
     90  * Create a new anonymous device vnode.
     91  */
     92 int
     93 dead_newvnode(struct mount *mp, struct vnode *dvp, struct vnode *vp,
     94     struct vattr *vap, kauth_cred_t cred, void *extra,
     95     size_t *key_len, const void **new_key)
     96 {
     97 
     98 	KASSERT(mp == dead_rootmount);
     99 	KASSERT(dvp == NULL);
    100 	KASSERT(vap->va_type == VCHR || vap->va_type == VBLK);
    101 	KASSERT(vap->va_rdev != VNOVAL);
    102 
    103 	vp->v_tag = VT_NON;
    104 	vp->v_type = vap->va_type;
    105 	vp->v_op = spec_vnodeop_p;
    106 	vp->v_vflag |= VV_MPSAFE;
    107 	uvm_vnp_setsize(vp, 0);
    108 	spec_node_init(vp, vap->va_rdev);
    109 
    110 	*key_len = 0;
    111 	*new_key = NULL;
    112 
    113 	return 0;
    114 }
    115