bsd/nfs/nfs_node.c

   1 /*
   2  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  29 /*
  30  * Copyright (c) 1989, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * This code is derived from software contributed to Berkeley by
  34  * Rick Macklem at The University of Guelph.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. All advertising materials mentioning features or use of this software
  45  *    must display the following acknowledgement:
  46  *      This product includes software developed by the University of
  47  *      California, Berkeley and its contributors.
  48  * 4. Neither the name of the University nor the names of its contributors
  49  *    may be used to endorse or promote products derived from this software
  50  *    without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62  * SUCH DAMAGE.
  63  *
  64  *      @(#)nfs_node.c  8.6 (Berkeley) 5/22/95
  65  * FreeBSD-Id: nfs_node.c,v 1.22 1997/10/28 14:06:20 bde Exp $
  66  */
  67
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/proc.h>
  72 #include <sys/kauth.h>
  73 #include <sys/mount_internal.h>
  74 #include <sys/vnode.h>
  75 #include <sys/ubc.h>
  76 #include <sys/malloc.h>
  77
  78 #include <nfs/rpcv2.h>
  79 #include <nfs/nfsproto.h>
  80 #include <nfs/nfs.h>
  81 #include <nfs/nfsnode.h>
  82 #include <nfs/nfsmount.h>
  83
  84 LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
  85 u_long nfsnodehash;
  86
  87 lck_grp_t * nfs_node_hash_lck_grp;
  88 lck_grp_attr_t * nfs_node_hash_lck_grp_attr;
  89 lck_attr_t * nfs_node_hash_lck_attr;
  90 lck_mtx_t *nfs_node_hash_mutex;
  91
  92 /*
  93  * Initialize hash links for nfsnodes
  94  * and build nfsnode free list.
  95  */
  96 void
  97 nfs_nhinit(void)
  98 {
  99         nfsnodehashtbl = hashinit(desiredvnodes, M_NFSNODE, &nfsnodehash);
 100
 101         nfs_node_hash_lck_grp_attr = lck_grp_attr_alloc_init();
 102         lck_grp_attr_setstat(nfs_node_hash_lck_grp_attr);
 103         nfs_node_hash_lck_grp = lck_grp_alloc_init("nfs_node_hash", nfs_node_hash_lck_grp_attr);
 104
 105         nfs_node_hash_lck_attr = lck_attr_alloc_init();
 106
 107         nfs_node_hash_mutex = lck_mtx_alloc_init(nfs_node_hash_lck_grp, nfs_node_hash_lck_attr);
 108 }
 109
 110 /*
 111  * Compute an entry in the NFS hash table structure
 112  */
 113 u_long
 114 nfs_hash(u_char *fhp, int fhsize)
 115 {
 116         u_long fhsum;
 117         int i;
 118
 119         fhsum = 0;
 120         for (i = 0; i < fhsize; i++)
 121                 fhsum += *fhp++;
 122         return (fhsum);
 123 }
 124
 125 /*
 126  * Look up a vnode/nfsnode by file handle.
 127  * Callers must check for mount points!!
 128  * In all cases, a pointer to a
 129  * nfsnode structure is returned.
 130  */
 131 int
 132 nfs_nget(
 133         mount_t mntp,
 134         vnode_t dvp,
 135         struct componentname *cnp,
 136         u_char *fhp,
 137         int fhsize,
 138         struct nfs_vattr *nvap,
 139         u_int64_t *xidp,
 140         int flags,
 141         struct nfsnode **npp)
 142 {
 143         struct nfsnode *np;
 144         struct nfsnodehashhead *nhpp;
 145         vnode_t vp, nvp;
 146         int error;
 147         mount_t mp;
 148         struct vnode_fsparam vfsp;
 149         uint32_t vid;
 150
 151         /* Check for unmount in progress */
 152         if (!mntp || (mntp->mnt_kern_flag & MNTK_UNMOUNT)) {
 153                 *npp = 0;
 154                 return (!mntp ? ENXIO : EPERM);
 155         }
 156
 157         nhpp = NFSNOHASH(nfs_hash(fhp, fhsize));
 158 loop:
 159         lck_mtx_lock(nfs_node_hash_mutex);
 160         for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
 161                 mp = (np->n_flag & NINIT) ? np->n_mount : vnode_mount(NFSTOV(np));
 162                 if (mntp != mp || np->n_fhsize != fhsize ||
 163                     bcmp(fhp, np->n_fhp, fhsize))
 164                         continue;
 165                 /* if the node is still being initialized, sleep on it */
 166                 if (np->n_flag & NINIT) {
 167                         np->n_flag |= NWINIT;
 168                         msleep(np, nfs_node_hash_mutex, PDROP | PINOD, "nfs_nget", 0);
 169                         goto loop;
 170                 }
 171                 vp = NFSTOV(np);
 172                 vid = vnode_vid(vp);
 173                 lck_mtx_unlock(nfs_node_hash_mutex);
 174                 if ((error = vnode_getwithvid(vp, vid))) {
 175                         /*
 176                          * If vnode is being reclaimed or has already
 177                          * changed identity, no need to wait.
 178                          */
 179                         return (error);
 180                 }
 181                 /* update attributes */
 182                 error = nfs_loadattrcache(np, nvap, xidp, 0);
 183                 if (error) {
 184                         vnode_put(vp);
 185                 } else {
 186                         if (dvp && cnp && (flags & NG_MAKEENTRY))
 187                                 cache_enter(dvp, vp, cnp);
 188                         *npp = np;
 189                 }
 190                 return(error);
 191         }
 192
 193         /*
 194          * allocate and initialize nfsnode and stick it in the hash
 195          * before calling getnewvnode().  Anyone finding it in the
 196          * hash before initialization is complete will wait for it.
 197          */
 198         MALLOC_ZONE(np, struct nfsnode *, sizeof *np, M_NFSNODE, M_WAITOK);
 199         if (!np) {
 200                 lck_mtx_unlock(nfs_node_hash_mutex);
 201                 *npp = 0;
 202                 return (ENOMEM);
 203         }
 204         bzero((caddr_t)np, sizeof *np);
 205         np->n_flag |= NINIT;
 206         np->n_mount = mntp;
 207
 208         /* setup node's file handle */
 209         if (fhsize > NFS_SMALLFH) {
 210                 MALLOC_ZONE(np->n_fhp, u_char *,
 211                                 fhsize, M_NFSBIGFH, M_WAITOK);
 212                 if (!np->n_fhp) {
 213                         lck_mtx_unlock(nfs_node_hash_mutex);
 214                         FREE_ZONE(np, sizeof *np, M_NFSNODE);
 215                         *npp = 0;
 216                         return (ENOMEM);
 217                 }
 218         } else {
 219                 np->n_fhp = &np->n_fh[0];
 220         }
 221         bcopy(fhp, np->n_fhp, fhsize);
 222         np->n_fhsize = fhsize;
 223
 224         /* Insert the nfsnode in the hash queue for its new file handle */
 225         np->n_flag |= NHASHED;
 226         LIST_INSERT_HEAD(nhpp, np, n_hash);
 227
 228         /* release lock on hash table */
 229         lck_mtx_unlock(nfs_node_hash_mutex);
 230
 231         /* do initial loading of attributes */
 232         error = nfs_loadattrcache(np, nvap, xidp, 1);
 233         if (error) {
 234                 lck_mtx_lock(nfs_node_hash_mutex);
 235                 LIST_REMOVE(np, n_hash);
 236                 np->n_flag &= ~(NHASHED|NINIT);
 237                 if (np->n_flag & NWINIT) {
 238                         np->n_flag &= ~NWINIT;
 239                         wakeup((caddr_t)np);
 240                 }
 241                 lck_mtx_unlock(nfs_node_hash_mutex);
 242                 if (np->n_fhsize > NFS_SMALLFH)
 243                         FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
 244                 FREE_ZONE(np, sizeof *np, M_NFSNODE);
 245                 *npp = 0;
 246                 return (error);
 247         }
 248         np->n_mtime = nvap->nva_mtime;
 249         if (nvap->nva_type == VDIR)
 250                 np->n_ncmtime = nvap->nva_mtime;
 251         NMODEINVALIDATE(np);
 252
 253         /* now, attempt to get a new vnode */
 254         vfsp.vnfs_mp = mntp;
 255         vfsp.vnfs_vtype = nvap->nva_type;
 256         vfsp.vnfs_str = "nfs";
 257         vfsp.vnfs_dvp = dvp;
 258         vfsp.vnfs_fsnode = np;
 259         if (nvap->nva_type == VFIFO)
 260                 vfsp.vnfs_vops = fifo_nfsv2nodeop_p;
 261         else if (nvap->nva_type == VBLK || nvap->nva_type == VCHR)
 262                 vfsp.vnfs_vops = spec_nfsv2nodeop_p;
 263         else
 264                 vfsp.vnfs_vops = nfsv2_vnodeop_p;
 265         vfsp.vnfs_markroot = (flags & NG_MARKROOT) ? 1 : 0;
 266         vfsp.vnfs_marksystem = 0;
 267         vfsp.vnfs_rdev = 0;
 268         vfsp.vnfs_filesize = nvap->nva_size;
 269         vfsp.vnfs_cnp = cnp;
 270         if (dvp && cnp && (flags & NG_MAKEENTRY))
 271                 vfsp.vnfs_flags = 0;
 272         else
 273                 vfsp.vnfs_flags = VNFS_NOCACHE;
 274         error = vnode_create(VNCREATE_FLAVOR, VCREATESIZE, &vfsp, &nvp);
 275         if (error) {
 276                 lck_mtx_lock(nfs_node_hash_mutex);
 277                 LIST_REMOVE(np, n_hash);
 278                 np->n_flag &= ~(NHASHED|NINIT);
 279                 if (np->n_flag & NWINIT) {
 280                         np->n_flag &= ~NWINIT;
 281                         wakeup((caddr_t)np);
 282                 }
 283                 lck_mtx_unlock(nfs_node_hash_mutex);
 284                 if (np->n_fhsize > NFS_SMALLFH)
 285                         FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
 286                 FREE_ZONE(np, sizeof *np, M_NFSNODE);
 287                 *npp = 0;
 288                 return (error);
 289         }
 290         vp = nvp;
 291         np->n_vnode = vp;
 292         vnode_addfsref(vp);
 293         vnode_settag(vp, VT_NFS); // XXX shouldn't this be a vnode_create() parameter?
 294         *npp = np;
 295         /* node is now initialized */
 296
 297         /* check if anyone's waiting on this node */
 298         lck_mtx_lock(nfs_node_hash_mutex);
 299         np->n_flag &= ~NINIT;
 300         if (np->n_flag & NWINIT) {
 301                 np->n_flag &= ~NWINIT;
 302                 wakeup((caddr_t)np);
 303         }
 304         lck_mtx_unlock(nfs_node_hash_mutex);
 305
 306         return (error);
 307 }
 308
 309
 310 int
 311 nfs_inactive(ap)
 312         struct vnop_inactive_args /* {
 313                 struct vnodeop_desc *a_desc;
 314                 vnode_t a_vp;
 315                 vfs_context_t a_context;
 316         } */ *ap;
 317 {
 318         register struct nfsnode *np;
 319         register struct sillyrename *sp;
 320         kauth_cred_t cred;
 321
 322         np = VTONFS(ap->a_vp);
 323         if (vnode_vtype(ap->a_vp) != VDIR) {
 324                 sp = np->n_sillyrename;
 325                 np->n_sillyrename = (struct sillyrename *)0;
 326         } else
 327                 sp = (struct sillyrename *)0;
 328
 329         if (sp) {
 330                 /*
 331                  * Remove the silly file that was rename'd earlier
 332                  */
 333 #if DIAGNOSTIC
 334                 kprintf("nfs_inactive removing %s, dvp=%x, a_vp=%x, ap=%x, np=%x, sp=%x\n",
 335                         &sp->s_name[0], (unsigned)sp->s_dvp, (unsigned)ap->a_vp, (unsigned)ap,
 336                         (unsigned)np, (unsigned)sp);
 337 #endif
 338                 nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, vfs_context_proc(ap->a_context), 1);
 339                 np->n_size = 0;
 340                 ubc_setsize(ap->a_vp, (off_t)0);
 341                 nfs_removeit(sp);
 342                 /*
 343                  * remove nfsnode from hash now so we can't accidentally find it
 344                  * again if another object gets created with the same filehandle
 345                  * before this vnode gets reclaimed
 346                  */
 347                 lck_mtx_lock(nfs_node_hash_mutex);
 348                 LIST_REMOVE(np, n_hash);
 349                 np->n_flag &= ~NHASHED;
 350                 lck_mtx_unlock(nfs_node_hash_mutex);
 351                 cred = sp->s_cred;
 352                 if (cred != NOCRED) {
 353                         sp->s_cred = NOCRED;
 354                         kauth_cred_rele(cred);
 355                 }
 356                 vnode_rele(sp->s_dvp);
 357                 FREE_ZONE((caddr_t)sp, sizeof (struct sillyrename), M_NFSREQ);
 358                 vnode_recycle(ap->a_vp);
 359         }
 360         /* clear all flags other than these */
 361         np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NHASHED);
 362         return (0);
 363 }
 364
 365 /*
 366  * Reclaim an nfsnode so that it can be used for other purposes.
 367  */
 368 int
 369 nfs_reclaim(ap)
 370         struct vnop_reclaim_args /* {
 371                 struct vnodeop_desc *a_desc;
 372                 vnode_t a_vp;
 373                 vfs_context_t a_context;
 374         } */ *ap;
 375 {
 376         vnode_t vp = ap->a_vp;
 377         struct nfsnode *np = VTONFS(vp);
 378         struct nfsdmap *dp, *dp2;
 379
 380         vnode_removefsref(vp);
 381
 382         if (np->n_flag & NHASHED) {
 383                 lck_mtx_lock(nfs_node_hash_mutex);
 384                 LIST_REMOVE(np, n_hash);
 385                 np->n_flag &= ~NHASHED;
 386                 lck_mtx_unlock(nfs_node_hash_mutex);
 387         }
 388
 389         /*
 390          * Free up any directory cookie structures and
 391          * large file handle structures that might be associated with
 392          * this nfs node.
 393          */
 394         if (vnode_vtype(vp) == VDIR) {
 395                 dp = np->n_cookies.lh_first;
 396                 while (dp) {
 397                         dp2 = dp;
 398                         dp = dp->ndm_list.le_next;
 399                         FREE_ZONE((caddr_t)dp2,
 400                                         sizeof (struct nfsdmap), M_NFSDIROFF);
 401                 }
 402         }
 403         if (np->n_fhsize > NFS_SMALLFH) {
 404                 FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
 405         }
 406         vnode_clearfsnode(vp);
 407
 408         FREE_ZONE(np, sizeof(struct nfsnode), M_NFSNODE);
 409         return (0);
 410 }
 411