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genfs_vnops.c revision 1.19 
      1 /*	$NetBSD: genfs_vnops.c,v 1.19 2000/08/03 20:41:27 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  */
     36 
     37 #include "opt_nfsserver.h"
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/proc.h>
     42 #include <sys/kernel.h>
     43 #include <sys/mount.h>
     44 #include <sys/namei.h>
     45 #include <sys/vnode.h>
     46 #include <sys/fcntl.h>
     47 #include <sys/malloc.h>
     48 #include <sys/poll.h>
     49 
     50 #include <miscfs/genfs/genfs.h>
     51 #include <miscfs/specfs/specdev.h>
     52 
     53 #ifdef NFSSERVER
     54 #include <nfs/rpcv2.h>
     55 #include <nfs/nfsproto.h>
     56 #include <nfs/nfs.h>
     57 #include <nfs/nqnfs.h>
     58 #include <nfs/nfs_var.h>
     59 #endif
     60 
     61 int
     62 genfs_poll(v)
     63 	void *v;
     64 {
     65 	struct vop_poll_args /* {
     66 		struct vnode *a_vp;
     67 		int a_events;
     68 		struct proc *a_p;
     69 	} */ *ap = v;
     70 
     71 	return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
     72 }
     73 
     74 int
     75 genfs_fsync(v)
     76 	void *v;
     77 {
     78 	struct vop_fsync_args /* {
     79 		struct vnode *a_vp;
     80 		struct ucred *a_cred;
     81 		int a_flags;
     82 		struct proc *a_p;
     83 	} */ *ap = v;
     84 	struct vnode *vp = ap->a_vp;
     85 	int wait;
     86 
     87 	wait = (ap->a_flags & FSYNC_WAIT) != 0;
     88 	vflushbuf(vp, wait);
     89 	if ((ap->a_flags & FSYNC_DATAONLY) != 0)
     90 		return (0);
     91 	else
     92 		return (VOP_UPDATE(vp, NULL, NULL, wait ? UPDATE_WAIT : 0));
     93 }
     94 
     95 int
     96 genfs_seek(v)
     97 	void *v;
     98 {
     99 	struct vop_seek_args /* {
    100 		struct vnode *a_vp;
    101 		off_t a_oldoff;
    102 		off_t a_newoff;
    103 		struct ucred *a_ucred;
    104 	} */ *ap = v;
    105 
    106 	if (ap->a_newoff < 0)
    107 		return (EINVAL);
    108 
    109 	return (0);
    110 }
    111 
    112 int
    113 genfs_abortop(v)
    114 	void *v;
    115 {
    116 	struct vop_abortop_args /* {
    117 		struct vnode *a_dvp;
    118 		struct componentname *a_cnp;
    119 	} */ *ap = v;
    120 
    121 	if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
    122 		PNBUF_PUT(ap->a_cnp->cn_pnbuf);
    123 	return (0);
    124 }
    125 
    126 int
    127 genfs_fcntl(v)
    128 	void *v;
    129 {
    130 	struct vop_fcntl_args /* {
    131 		struct vnode *a_vp;
    132 		u_int a_command;
    133 		caddr_t a_data;
    134 		int a_fflag;
    135 		struct ucred *a_cred;
    136 		struct proc *a_p;
    137 	} */ *ap = v;
    138 
    139 	if (ap->a_command == F_SETFL)
    140 		return (0);
    141 	else
    142 		return (EOPNOTSUPP);
    143 }
    144 
    145 /*ARGSUSED*/
    146 int
    147 genfs_badop(v)
    148 	void *v;
    149 {
    150 
    151 	panic("genfs: bad op");
    152 }
    153 
    154 /*ARGSUSED*/
    155 int
    156 genfs_nullop(v)
    157 	void *v;
    158 {
    159 
    160 	return (0);
    161 }
    162 
    163 /*ARGSUSED*/
    164 int
    165 genfs_einval(v)
    166 	void *v;
    167 {
    168 
    169 	return (EINVAL);
    170 }
    171 
    172 /*ARGSUSED*/
    173 int
    174 genfs_eopnotsupp(v)
    175 	void *v;
    176 {
    177 
    178 	return (EOPNOTSUPP);
    179 }
    180 
    181 /*
    182  * Called when an fs doesn't support a particular vop but the vop needs to
    183  * vrele, vput, or vunlock passed in vnodes.
    184  */
    185 int
    186 genfs_eopnotsupp_rele(v)
    187 	void *v;
    188 {
    189 	struct vop_generic_args /*
    190 		struct vnodeop_desc *a_desc;
    191 		/ * other random data follows, presumably * /
    192 	} */ *ap = v;
    193 	struct vnodeop_desc *desc = ap->a_desc;
    194 	struct vnode *vp;
    195 	int flags, i, j, offset;
    196 
    197 	flags = desc->vdesc_flags;
    198 	for (i = 0; i < VDESC_MAX_VPS; flags >>=1, i++) {
    199 		if ((offset = desc->vdesc_vp_offsets[i]) == VDESC_NO_OFFSET)
    200 			break;	/* stop at end of list */
    201 		if ((j = flags & VDESC_VP0_WILLPUT)) {
    202 			vp = *VOPARG_OFFSETTO(struct vnode**,offset,ap);
    203 			switch (j) {
    204 			case VDESC_VP0_WILLPUT:
    205 				vput(vp);
    206 				break;
    207 			case VDESC_VP0_WILLUNLOCK:
    208 				VOP_UNLOCK(vp, 0);
    209 				break;
    210 			case VDESC_VP0_WILLRELE:
    211 				vrele(vp);
    212 				break;
    213 			}
    214 		}
    215 	}
    216 
    217 	return (EOPNOTSUPP);
    218 }
    219 
    220 /*ARGSUSED*/
    221 int
    222 genfs_ebadf(v)
    223 	void *v;
    224 {
    225 
    226 	return (EBADF);
    227 }
    228 
    229 /* ARGSUSED */
    230 int
    231 genfs_enoioctl(v)
    232 	void *v;
    233 {
    234 
    235 	return (ENOTTY);
    236 }
    237 
    238 
    239 /*
    240  * Eliminate all activity associated with the requested vnode
    241  * and with all vnodes aliased to the requested vnode.
    242  */
    243 int
    244 genfs_revoke(v)
    245 	void *v;
    246 {
    247 	struct vop_revoke_args /* {
    248 		struct vnode *a_vp;
    249 		int a_flags;
    250 	} */ *ap = v;
    251 	struct vnode *vp, *vq;
    252 	struct proc *p = curproc;	/* XXX */
    253 
    254 #ifdef DIAGNOSTIC
    255 	if ((ap->a_flags & REVOKEALL) == 0)
    256 		panic("genfs_revoke: not revokeall");
    257 #endif
    258 
    259 	vp = ap->a_vp;
    260 	simple_lock(&vp->v_interlock);
    261 
    262 	if (vp->v_flag & VALIASED) {
    263 		/*
    264 		 * If a vgone (or vclean) is already in progress,
    265 		 * wait until it is done and return.
    266 		 */
    267 		if (vp->v_flag & VXLOCK) {
    268 			vp->v_flag |= VXWANT;
    269 			simple_unlock(&vp->v_interlock);
    270 			tsleep((caddr_t)vp, PINOD, "vop_revokeall", 0);
    271 			return (0);
    272 		}
    273 		/*
    274 		 * Ensure that vp will not be vgone'd while we
    275 		 * are eliminating its aliases.
    276 		 */
    277 		vp->v_flag |= VXLOCK;
    278 		simple_unlock(&vp->v_interlock);
    279 		while (vp->v_flag & VALIASED) {
    280 			simple_lock(&spechash_slock);
    281 			for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
    282 				if (vq->v_rdev != vp->v_rdev ||
    283 				    vq->v_type != vp->v_type || vp == vq)
    284 					continue;
    285 				simple_unlock(&spechash_slock);
    286 				vgone(vq);
    287 				break;
    288 			}
    289 			if (vq == NULLVP)
    290 				simple_unlock(&spechash_slock);
    291 		}
    292 		/*
    293 		 * Remove the lock so that vgone below will
    294 		 * really eliminate the vnode after which time
    295 		 * vgone will awaken any sleepers.
    296 		 */
    297 		simple_lock(&vp->v_interlock);
    298 		vp->v_flag &= ~VXLOCK;
    299 	}
    300 	vgonel(vp, p);
    301 	return (0);
    302 }
    303 
    304 /*
    305  * Lock the node.
    306  */
    307 int
    308 genfs_lock(v)
    309 	void *v;
    310 {
    311 	struct vop_lock_args /* {
    312 		struct vnode *a_vp;
    313 		int a_flags;
    314 	} */ *ap = v;
    315 	struct vnode *vp = ap->a_vp;
    316 
    317 	return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock));
    318 }
    319 
    320 /*
    321  * Unlock the node.
    322  */
    323 int
    324 genfs_unlock(v)
    325 	void *v;
    326 {
    327 	struct vop_unlock_args /* {
    328 		struct vnode *a_vp;
    329 		int a_flags;
    330 	} */ *ap = v;
    331 	struct vnode *vp = ap->a_vp;
    332 
    333 	return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE,
    334 		&vp->v_interlock));
    335 }
    336 
    337 /*
    338  * Return whether or not the node is locked.
    339  */
    340 int
    341 genfs_islocked(v)
    342 	void *v;
    343 {
    344 	struct vop_islocked_args /* {
    345 		struct vnode *a_vp;
    346 	} */ *ap = v;
    347 	struct vnode *vp = ap->a_vp;
    348 
    349 	return (lockstatus(&vp->v_lock));
    350 }
    351 
    352 /*
    353  * Stubs to use when there is no locking to be done on the underlying object.
    354  */
    355 int
    356 genfs_nolock(v)
    357 	void *v;
    358 {
    359 	struct vop_lock_args /* {
    360 		struct vnode *a_vp;
    361 		int a_flags;
    362 		struct proc *a_p;
    363 	} */ *ap = v;
    364 
    365 	/*
    366 	 * Since we are not using the lock manager, we must clear
    367 	 * the interlock here.
    368 	 */
    369 	if (ap->a_flags & LK_INTERLOCK)
    370 		simple_unlock(&ap->a_vp->v_interlock);
    371 	return (0);
    372 }
    373 
    374 int
    375 genfs_nounlock(v)
    376 	void *v;
    377 {
    378 	return (0);
    379 }
    380 
    381 int
    382 genfs_noislocked(v)
    383 	void *v;
    384 {
    385 	return (0);
    386 }
    387 
    388 /*
    389  * Local lease check for NFS servers.  Just set up args and let
    390  * nqsrv_getlease() do the rest.  If NFSSERVER is not in the kernel,
    391  * this is a null operation.
    392  */
    393 int
    394 genfs_lease_check(v)
    395 	void *v;
    396 {
    397 #ifdef NFSSERVER
    398 	struct vop_lease_args /* {
    399 		struct vnode *a_vp;
    400 		struct proc *a_p;
    401 		struct ucred *a_cred;
    402 		int a_flag;
    403 	} */ *ap = v;
    404 	u_int32_t duration = 0;
    405 	int cache;
    406 	u_quad_t frev;
    407 
    408 	(void) nqsrv_getlease(ap->a_vp, &duration, ND_CHECK | ap->a_flag,
    409 	    NQLOCALSLP, ap->a_p, (struct mbuf *)0, &cache, &frev, ap->a_cred);
    410 	return (0);
    411 #else
    412 	return (0);
    413 #endif /* NFSSERVER */
    414 }
    415