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      1 /*	$NetBSD: dead_vnops.c,v 1.67 2022/10/26 23:39:43 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)dead_vnops.c	8.2 (Berkeley) 11/21/94
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: dead_vnops.c,v 1.67 2022/10/26 23:39:43 riastradh Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/time.h>
     40 #include <sys/vnode.h>
     41 #include <sys/errno.h>
     42 #include <sys/namei.h>
     43 #include <sys/buf.h>
     44 #include <sys/proc.h>
     45 
     46 #include <miscfs/deadfs/deadfs.h>
     47 #include <miscfs/genfs/genfs.h>
     48 
     49 /*
     50  * Prototypes for dead operations on vnodes.
     51  */
     52 int	dead_lookup(void *);
     53 int	dead_open(void *);
     54 int	dead_read(void *);
     55 int	dead_write(void *);
     56 int	dead_ioctl(void *);
     57 int	dead_poll(void *);
     58 int	dead_remove(void *);
     59 int	dead_link(void *);
     60 int	dead_rename(void *);
     61 int	dead_rmdir(void *);
     62 int	dead_inactive(void *);
     63 int	dead_bmap(void *);
     64 int	dead_strategy(void *);
     65 int	dead_print(void *);
     66 int	dead_getpages(void *);
     67 int	dead_putpages(void *);
     68 
     69 int	dead_default_error(void *);
     70 
     71 int (**dead_vnodeop_p)(void *);
     72 
     73 static const struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
     74 	{ &vop_default_desc, dead_default_error },
     75 	{ &vop_bwrite_desc, vn_bwrite },		/* bwrite */
     76 	{ &vop_parsepath_desc, genfs_parsepath },	/* parsepath */
     77 	{ &vop_lookup_desc, dead_lookup },		/* lookup */
     78 	{ &vop_open_desc, dead_open },			/* open */
     79 	{ &vop_close_desc, genfs_nullop },		/* close */
     80 	{ &vop_read_desc, dead_read },			/* read */
     81 	{ &vop_write_desc, dead_write },		/* write */
     82 	{ &vop_fallocate_desc, genfs_eopnotsupp },	/* fallocate */
     83 	{ &vop_fdiscard_desc, genfs_eopnotsupp },	/* fdiscard */
     84 	{ &vop_fcntl_desc, genfs_nullop },		/* fcntl */
     85 	{ &vop_ioctl_desc, dead_ioctl },		/* ioctl */
     86 	{ &vop_poll_desc, dead_poll },			/* poll */
     87 	{ &vop_remove_desc, dead_remove },		/* remove */
     88 	{ &vop_link_desc, dead_link },			/* link */
     89 	{ &vop_rename_desc, dead_rename },		/* rename */
     90 	{ &vop_rmdir_desc, dead_rmdir },		/* rmdir */
     91 	{ &vop_fsync_desc, genfs_nullop },		/* fsync */
     92 	{ &vop_seek_desc, genfs_nullop },		/* seek */
     93 	{ &vop_inactive_desc, dead_inactive },		/* inactive */
     94 	{ &vop_reclaim_desc, genfs_nullop },		/* reclaim */
     95 	{ &vop_lock_desc, genfs_deadlock },		/* lock */
     96 	{ &vop_unlock_desc, genfs_deadunlock },		/* unlock */
     97 	{ &vop_bmap_desc, dead_bmap },			/* bmap */
     98 	{ &vop_strategy_desc, dead_strategy },		/* strategy */
     99 	{ &vop_print_desc, dead_print },		/* print */
    100 	{ &vop_islocked_desc, genfs_deadislocked },	/* islocked */
    101 	{ &vop_revoke_desc, genfs_nullop },		/* revoke */
    102 	{ &vop_getpages_desc, dead_getpages },		/* getpages */
    103 	{ &vop_putpages_desc, dead_putpages },		/* putpages */
    104 	{ NULL, NULL }
    105 };
    106 const struct vnodeopv_desc dead_vnodeop_opv_desc =
    107 	{ &dead_vnodeop_p, dead_vnodeop_entries };
    108 
    109 /* ARGSUSED */
    110 int
    111 dead_default_error(void *v)
    112 {
    113 
    114 	return EBADF;
    115 }
    116 
    117 int
    118 dead_bmap(void *v)
    119 {
    120 	struct vop_bmap_args /* {
    121 		struct vnode *a_vp;
    122 		daddr_t  a_bn;
    123 		struct vnode **a_vpp;
    124 		daddr_t *a_bnp;
    125 		int *a_runp;
    126 	} */ *ap = v;
    127 
    128 	(void)ap;
    129 
    130 	return (EIO);
    131 }
    132 
    133 int
    134 dead_lookup(void *v)
    135 {
    136 	struct vop_lookup_v2_args /* {
    137 		struct vnode *a_dvp;
    138 		struct vnode **a_vpp;
    139 		struct componentname *a_cnp;
    140 	} */ *ap = v;
    141 
    142 	*(ap->a_vpp) = NULL;
    143 
    144 	return ENOENT;
    145 }
    146 
    147 int
    148 dead_open(void *v)
    149 {
    150 	struct vop_open_args /* {
    151 		struct vnode *a_vp;
    152 		int a_mode;
    153 		kauth_cred_t a_cred;
    154 	} */ *ap = v;
    155 
    156 	(void)ap;
    157 
    158 	return (ENXIO);
    159 }
    160 
    161 int
    162 dead_read(void *v)
    163 {
    164 	struct vop_read_args /* {
    165 		struct vnode *a_vp;
    166 		struct uio *a_uio;
    167 		int  a_ioflag;
    168 		kauth_cred_t a_cred;
    169 	} */ *ap = v;
    170 
    171 	/*
    172 	 * Return EOF for tty devices, EIO for others
    173 	 */
    174 	if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
    175 		return (EIO);
    176 	return (0);
    177 }
    178 
    179 int
    180 dead_write(void *v)
    181 {
    182 	struct vop_write_args /* {
    183 		struct vnode *a_vp;
    184 		struct uio *a_uio;
    185 		int  a_ioflag;
    186 		kauth_cred_t a_cred;
    187 	} */ *ap = v;
    188 
    189 	(void)ap;
    190 
    191 	return (EIO);
    192 }
    193 
    194 int
    195 dead_ioctl(void *v)
    196 {
    197 	struct vop_ioctl_args /* {
    198 		struct vnode *a_vp;
    199 		u_long a_command;
    200 		void *a_data;
    201 		int  a_fflag;
    202 		kauth_cred_t a_cred;
    203 		struct lwp *a_l;
    204 	} */ *ap = v;
    205 
    206 	(void)ap;
    207 
    208 	return (EBADF);
    209 }
    210 
    211 int
    212 dead_poll(void *v)
    213 {
    214 	struct vop_poll_args /* {
    215 		struct vnode *a_vp;
    216 		int a_events;
    217 		struct lwp *a_l;
    218 	} */ *ap = v;
    219 
    220 	/*
    221 	 * Let the user find out that the descriptor is gone.
    222 	 */
    223 	return (ap->a_events);
    224 }
    225 
    226 int
    227 dead_remove(void *v)
    228 {
    229 	struct vop_remove_v3_args /* {
    230 		struct vnode *a_dvp;
    231 		struct vnode *a_vp;
    232 		struct componentname *a_cnp;
    233 		nlink_t ctx_vp_new_nlink;
    234 	} */ *ap = v;
    235 
    236 	vput(ap->a_vp);
    237 
    238 	return EIO;
    239 }
    240 
    241 int
    242 dead_link(void *v)
    243 {
    244 	struct vop_link_v2_args /* {
    245 		struct vnode *a_dvp;
    246 		struct vnode *a_vp;
    247 		struct componentname *a_cnp;
    248 	} */ *ap = v;
    249 
    250 	(void)ap;
    251 
    252 	return EIO;
    253 }
    254 
    255 int
    256 dead_rename(void *v)
    257 {
    258 	struct vop_rename_args /* {
    259 		struct vnode *a_fdvp;
    260 		struct vnode *a_fvp;
    261 		struct componentname *a_fcnp;
    262 		struct vnode *a_tdvp;
    263 		struct vnode *a_tvp;
    264 		struct componentname *a_tcnp;
    265 	} */ *ap = v;
    266 
    267 	vrele(ap->a_fdvp);
    268 	vrele(ap->a_fvp);
    269 	if (ap->a_tvp != NULL && ap->a_tvp != ap->a_tdvp)
    270 		VOP_UNLOCK(ap->a_tvp);
    271 	vput(ap->a_tdvp);
    272 	if (ap->a_tvp != NULL)
    273 		vrele(ap->a_tvp);
    274 
    275 	return EIO;
    276 }
    277 
    278 int
    279 dead_rmdir(void *v)
    280 {
    281 	struct vop_rmdir_v2_args /* {
    282 		struct vnode *a_dvp;
    283 		struct vnode *a_vp;
    284 		struct componentname *a_cnp;
    285 	} */ *ap = v;
    286 
    287 	vput(ap->a_vp);
    288 
    289 	return EIO;
    290 }
    291 
    292 int
    293 dead_inactive(void *v)
    294 {
    295 	struct vop_inactive_v2_args /* {
    296 		struct vnode *a_vp;
    297 		bool *a_recycle;
    298 	} */ *ap = v;
    299 
    300 	*ap->a_recycle = false;
    301 
    302 	return 0;
    303 }
    304 
    305 int
    306 dead_strategy(void *v)
    307 {
    308 	struct vop_strategy_args /* {
    309 		struct vnode *a_vp;
    310 		struct buf *a_bp;
    311 	} */ *ap = v;
    312 	struct buf *bp;
    313 
    314 	bp = ap->a_bp;
    315 	bp->b_error = EIO;
    316 	bp->b_resid = bp->b_bcount;
    317 	biodone(ap->a_bp);
    318 	return (EIO);
    319 }
    320 
    321 /* ARGSUSED */
    322 int
    323 dead_print(void *v)
    324 {
    325 	printf("tag VT_NON, dead vnode\n");
    326 	return 0;
    327 }
    328 
    329 int
    330 dead_getpages(void *v)
    331 {
    332 	struct vop_getpages_args /* {
    333 		struct vnode *a_vp;
    334 		voff_t a_offset;
    335 		struct vm_page **a_m;
    336 		int *a_count;
    337 		int a_centeridx;
    338 		vm_prot_t a_access_type;
    339 		int a_advice;
    340 		int a_flags;
    341 	} */ *ap = v;
    342 
    343 	if ((ap->a_flags & PGO_LOCKED) == 0)
    344 		rw_exit(ap->a_vp->v_uobj.vmobjlock);
    345 
    346 	return (EFAULT);
    347 }
    348 
    349 int
    350 dead_putpages(void *v)
    351 {
    352         struct vop_putpages_args /* {
    353 		struct vnode *a_vp;
    354 		voff_t a_offlo;
    355 		voff_t a_offhi;
    356 		int a_flags;
    357 	} */ *ap = v;
    358 
    359 	rw_exit(ap->a_vp->v_uobj.vmobjlock);
    360 	return (EFAULT);
    361 }
    362