1 /* $NetBSD: nfs_vfsops.c,v 1.85 1999/11/15 18:49:11 fvdl Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 39 */ 40 41 #if defined(_KERNEL) && !defined(_LKM) 42 #include "opt_compat_netbsd.h" 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/conf.h> 47 #include <sys/ioctl.h> 48 #include <sys/signal.h> 49 #include <sys/proc.h> 50 #include <sys/namei.h> 51 #include <sys/device.h> 52 #include <sys/vnode.h> 53 #include <sys/kernel.h> 54 #include <sys/mount.h> 55 #include <sys/buf.h> 56 #include <sys/mbuf.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/systm.h> 60 61 #include <net/if.h> 62 #include <net/route.h> 63 #include <netinet/in.h> 64 65 #include <nfs/rpcv2.h> 66 #include <nfs/nfsproto.h> 67 #include <nfs/nfsnode.h> 68 #include <nfs/nfs.h> 69 #include <nfs/nfsmount.h> 70 #include <nfs/xdr_subs.h> 71 #include <nfs/nfsm_subs.h> 72 #include <nfs/nfsdiskless.h> 73 #include <nfs/nqnfs.h> 74 #include <nfs/nfs_var.h> 75 76 extern struct nfsstats nfsstats; 77 extern int nfs_ticks; 78 79 int nfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 80 struct proc *)); 81 82 /* 83 * nfs vfs operations. 84 */ 85 86 extern struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 87 extern struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 88 extern struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 89 90 struct vnodeopv_desc *nfs_vnodeopv_descs[] = { 91 &nfsv2_vnodeop_opv_desc, 92 &spec_nfsv2nodeop_opv_desc, 93 &fifo_nfsv2nodeop_opv_desc, 94 NULL, 95 }; 96 97 struct vfsops nfs_vfsops = { 98 MOUNT_NFS, 99 nfs_mount, 100 nfs_start, 101 nfs_unmount, 102 nfs_root, 103 nfs_quotactl, 104 nfs_statfs, 105 nfs_sync, 106 nfs_vget, 107 nfs_fhtovp, 108 nfs_vptofh, 109 nfs_vfs_init, 110 nfs_sysctl, 111 nfs_mountroot, 112 nfs_checkexp, 113 nfs_vnodeopv_descs, 114 }; 115 116 extern u_int32_t nfs_procids[NFS_NPROCS]; 117 extern u_int32_t nfs_prog, nfs_vers; 118 119 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 120 struct mount **, struct vnode **, struct proc *)); 121 122 #define TRUE 1 123 #define FALSE 0 124 125 /* 126 * nfs statfs call 127 */ 128 int 129 nfs_statfs(mp, sbp, p) 130 struct mount *mp; 131 register struct statfs *sbp; 132 struct proc *p; 133 { 134 register struct vnode *vp; 135 register struct nfs_statfs *sfp; 136 register caddr_t cp; 137 register u_int32_t *tl; 138 register int32_t t1, t2; 139 caddr_t bpos, dpos, cp2; 140 struct nfsmount *nmp = VFSTONFS(mp); 141 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 142 struct mbuf *mreq, *mrep = NULL, *md, *mb, *mb2; 143 struct ucred *cred; 144 struct nfsnode *np; 145 u_quad_t tquad; 146 147 #ifndef nolint 148 sfp = (struct nfs_statfs *)0; 149 #endif 150 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 151 if (error) 152 return (error); 153 vp = NFSTOV(np); 154 cred = crget(); 155 cred->cr_ngroups = 0; 156 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 157 (void)nfs_fsinfo(nmp, vp, cred, p); 158 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 159 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 160 nfsm_fhtom(vp, v3); 161 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 162 if (v3) 163 nfsm_postop_attr(vp, retattr); 164 if (error) { 165 if (mrep != NULL) 166 m_free(mrep); 167 goto nfsmout; 168 } 169 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 170 #ifdef COMPAT_09 171 sbp->f_type = 2; 172 #else 173 sbp->f_type = 0; 174 #endif 175 sbp->f_flags = nmp->nm_flag; 176 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 177 if (v3) { 178 sbp->f_bsize = NFS_FABLKSIZE; 179 tquad = fxdr_hyper(&sfp->sf_tbytes); 180 sbp->f_blocks = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 181 tquad = fxdr_hyper(&sfp->sf_fbytes); 182 sbp->f_bfree = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 183 tquad = fxdr_hyper(&sfp->sf_abytes); 184 sbp->f_bavail = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 185 tquad = fxdr_hyper(&sfp->sf_tfiles); 186 sbp->f_files = (long)tquad; 187 tquad = fxdr_hyper(&sfp->sf_ffiles); 188 sbp->f_ffree = (long)tquad; 189 } else { 190 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 191 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 192 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 193 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 194 sbp->f_files = 0; 195 sbp->f_ffree = 0; 196 } 197 if (sbp != &mp->mnt_stat) { 198 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 199 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 200 } 201 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 202 nfsm_reqdone; 203 vrele(vp); 204 crfree(cred); 205 return (error); 206 } 207 208 /* 209 * nfs version 3 fsinfo rpc call 210 */ 211 int 212 nfs_fsinfo(nmp, vp, cred, p) 213 register struct nfsmount *nmp; 214 register struct vnode *vp; 215 struct ucred *cred; 216 struct proc *p; 217 { 218 register struct nfsv3_fsinfo *fsp; 219 register caddr_t cp; 220 register int32_t t1, t2; 221 register u_int32_t *tl, pref, max; 222 caddr_t bpos, dpos, cp2; 223 int error = 0, retattr; 224 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 225 u_int64_t maxfsize; 226 227 nfsstats.rpccnt[NFSPROC_FSINFO]++; 228 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 229 nfsm_fhtom(vp, 1); 230 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 231 nfsm_postop_attr(vp, retattr); 232 if (!error) { 233 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 234 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 235 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 236 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 237 ~(NFS_FABLKSIZE - 1); 238 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 239 if (max < nmp->nm_wsize && max > 0) { 240 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 241 if (nmp->nm_wsize == 0) 242 nmp->nm_wsize = max; 243 } 244 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 245 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 246 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 247 ~(NFS_FABLKSIZE - 1); 248 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 249 if (max < nmp->nm_rsize && max > 0) { 250 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 251 if (nmp->nm_rsize == 0) 252 nmp->nm_rsize = max; 253 } 254 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 255 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 256 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 257 ~(NFS_DIRFRAGSIZ - 1); 258 if (max < nmp->nm_readdirsize && max > 0) { 259 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 260 if (nmp->nm_readdirsize == 0) 261 nmp->nm_readdirsize = max; 262 } 263 /* XXX */ 264 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 265 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 266 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 267 nmp->nm_maxfilesize = maxfsize; 268 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 269 } 270 nfsm_reqdone; 271 return (error); 272 } 273 274 /* 275 * Mount a remote root fs via. NFS. It goes like this: 276 * - Call nfs_boot_init() to fill in the nfs_diskless struct 277 * - build the rootfs mount point and call mountnfs() to do the rest. 278 */ 279 int 280 nfs_mountroot() 281 { 282 struct nfs_diskless *nd; 283 struct vattr attr; 284 struct mount *mp; 285 struct vnode *vp; 286 struct proc *procp; 287 long n; 288 int error; 289 290 procp = curproc; /* XXX */ 291 292 if (root_device->dv_class != DV_IFNET) 293 return (ENODEV); 294 295 /* 296 * XXX time must be non-zero when we init the interface or else 297 * the arp code will wedge. [Fixed now in if_ether.c] 298 * However, the NFS attribute cache gives false "hits" when 299 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 300 */ 301 if (time.tv_sec < NFS_MAXATTRTIMO) 302 time.tv_sec = NFS_MAXATTRTIMO; 303 304 /* 305 * Call nfs_boot_init() to fill in the nfs_diskless struct. 306 * Side effect: Finds and configures a network interface. 307 */ 308 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 309 memset((caddr_t)nd, 0, sizeof(*nd)); 310 error = nfs_boot_init(nd, procp); 311 if (error) { 312 free(nd, M_NFSMNT); 313 return (error); 314 } 315 316 /* 317 * Create the root mount point. 318 */ 319 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 320 if (error) 321 goto out; 322 printf("root on %s\n", nd->nd_root.ndm_host); 323 324 /* 325 * Link it into the mount list. 326 */ 327 simple_lock(&mountlist_slock); 328 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 329 simple_unlock(&mountlist_slock); 330 rootvp = vp; 331 mp->mnt_vnodecovered = NULLVP; 332 vfs_unbusy(mp); 333 334 /* Get root attributes (for the time). */ 335 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 336 if (error) 337 panic("nfs_mountroot: getattr for root"); 338 n = attr.va_atime.tv_sec; 339 #ifdef DEBUG 340 printf("root time: 0x%lx\n", n); 341 #endif 342 inittodr(n); 343 344 out: 345 if (error) 346 nfs_boot_cleanup(nd, procp); 347 free(nd, M_NFSMNT); 348 return (error); 349 } 350 351 /* 352 * Internal version of mount system call for diskless setup. 353 * Separate function because we used to call it twice. 354 * (once for root and once for swap) 355 */ 356 static int 357 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 358 struct nfs_dlmount *ndmntp; 359 const char *mntname; /* mount point name */ 360 struct mount **mpp; 361 struct vnode **vpp; 362 struct proc *p; 363 { 364 struct mount *mp; 365 struct mbuf *m; 366 int error; 367 368 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 369 370 mp->mnt_op = &nfs_vfsops; 371 372 /* 373 * Historical practice expects NFS root file systems to 374 * be initially mounted r/w. 375 */ 376 mp->mnt_flag &= ~MNT_RDONLY; 377 378 /* Get mbuf for server sockaddr. */ 379 m = m_get(M_WAIT, MT_SONAME); 380 if (m == NULL) 381 panic("nfs_mountroot: mget soname for %s", mntname); 382 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 383 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 384 385 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 386 ndmntp->ndm_args.hostname, vpp, p); 387 if (error) { 388 mp->mnt_op->vfs_refcount--; 389 vfs_unbusy(mp); 390 printf("nfs_mountroot: mount %s failed: %d\n", 391 mntname, error); 392 free(mp, M_MOUNT); 393 } else 394 *mpp = mp; 395 396 return (error); 397 } 398 399 void 400 nfs_decode_args(nmp, argp) 401 struct nfsmount *nmp; 402 struct nfs_args *argp; 403 { 404 int s; 405 int adjsock; 406 int maxio; 407 408 s = splsoftnet(); 409 410 /* 411 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 412 * no sense in that context. 413 */ 414 if (argp->sotype == SOCK_STREAM) 415 argp->flags &= ~NFSMNT_NOCONN; 416 417 /* 418 * Cookie translation is not needed for v2, silently ignore it. 419 */ 420 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 421 NFSMNT_XLATECOOKIE) 422 argp->flags &= ~NFSMNT_XLATECOOKIE; 423 424 /* Re-bind if rsrvd port requested and wasn't on one */ 425 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 426 && (argp->flags & NFSMNT_RESVPORT); 427 /* Also re-bind if we're switching to/from a connected UDP socket */ 428 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 429 (argp->flags & NFSMNT_NOCONN)); 430 431 /* Update flags atomically. Don't change the lock bits. */ 432 nmp->nm_flag = argp->flags | nmp->nm_flag; 433 splx(s); 434 435 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 436 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 437 if (nmp->nm_timeo < NFS_MINTIMEO) 438 nmp->nm_timeo = NFS_MINTIMEO; 439 else if (nmp->nm_timeo > NFS_MAXTIMEO) 440 nmp->nm_timeo = NFS_MAXTIMEO; 441 } 442 443 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 444 nmp->nm_retry = argp->retrans; 445 if (nmp->nm_retry > NFS_MAXREXMIT) 446 nmp->nm_retry = NFS_MAXREXMIT; 447 } 448 449 if (argp->flags & NFSMNT_NFSV3) { 450 if (argp->sotype == SOCK_DGRAM) 451 maxio = NFS_MAXDGRAMDATA; 452 else 453 maxio = NFS_MAXDATA; 454 } else 455 maxio = NFS_V2MAXDATA; 456 457 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 458 int osize = nmp->nm_wsize; 459 nmp->nm_wsize = argp->wsize; 460 /* Round down to multiple of blocksize */ 461 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 462 if (nmp->nm_wsize <= 0) 463 nmp->nm_wsize = NFS_FABLKSIZE; 464 adjsock |= (nmp->nm_wsize != osize); 465 } 466 if (nmp->nm_wsize > maxio) 467 nmp->nm_wsize = maxio; 468 if (nmp->nm_wsize > MAXBSIZE) 469 nmp->nm_wsize = MAXBSIZE; 470 471 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 472 int osize = nmp->nm_rsize; 473 nmp->nm_rsize = argp->rsize; 474 /* Round down to multiple of blocksize */ 475 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 476 if (nmp->nm_rsize <= 0) 477 nmp->nm_rsize = NFS_FABLKSIZE; 478 adjsock |= (nmp->nm_rsize != osize); 479 } 480 if (nmp->nm_rsize > maxio) 481 nmp->nm_rsize = maxio; 482 if (nmp->nm_rsize > MAXBSIZE) 483 nmp->nm_rsize = MAXBSIZE; 484 485 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 486 nmp->nm_readdirsize = argp->readdirsize; 487 /* Round down to multiple of minimum blocksize */ 488 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 489 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 490 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 491 /* Bigger than buffer size makes no sense */ 492 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 493 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 494 } else if (argp->flags & NFSMNT_RSIZE) 495 nmp->nm_readdirsize = nmp->nm_rsize; 496 497 if (nmp->nm_readdirsize > maxio) 498 nmp->nm_readdirsize = maxio; 499 500 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 501 argp->maxgrouplist <= NFS_MAXGRPS) 502 nmp->nm_numgrps = argp->maxgrouplist; 503 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 504 argp->readahead <= NFS_MAXRAHEAD) 505 nmp->nm_readahead = argp->readahead; 506 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 507 argp->leaseterm <= NQ_MAXLEASE) 508 nmp->nm_leaseterm = argp->leaseterm; 509 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 510 argp->deadthresh <= NQ_NEVERDEAD) 511 nmp->nm_deadthresh = argp->deadthresh; 512 513 adjsock |= ((nmp->nm_sotype != argp->sotype) || 514 (nmp->nm_soproto != argp->proto)); 515 nmp->nm_sotype = argp->sotype; 516 nmp->nm_soproto = argp->proto; 517 518 if (nmp->nm_so && adjsock) { 519 nfs_safedisconnect(nmp); 520 if (nmp->nm_sotype == SOCK_DGRAM) 521 while (nfs_connect(nmp, (struct nfsreq *)0)) { 522 printf("nfs_args: retrying connect\n"); 523 (void) tsleep((caddr_t)&lbolt, 524 PSOCK, "nfscn3", 0); 525 } 526 } 527 } 528 529 /* 530 * VFS Operations. 531 * 532 * mount system call 533 * It seems a bit dumb to copyinstr() the host and path here and then 534 * memcpy() them in mountnfs(), but I wanted to detect errors before 535 * doing the sockargs() call because sockargs() allocates an mbuf and 536 * an error after that means that I have to release the mbuf. 537 */ 538 /* ARGSUSED */ 539 int 540 nfs_mount(mp, path, data, ndp, p) 541 struct mount *mp; 542 const char *path; 543 void *data; 544 struct nameidata *ndp; 545 struct proc *p; 546 { 547 int error; 548 struct nfs_args args; 549 struct mbuf *nam; 550 struct vnode *vp; 551 char pth[MNAMELEN], hst[MNAMELEN]; 552 size_t len; 553 u_char nfh[NFSX_V3FHMAX]; 554 555 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 556 if (error) 557 return (error); 558 if (args.version != NFS_ARGSVERSION) 559 return (EPROGMISMATCH); 560 if (mp->mnt_flag & MNT_UPDATE) { 561 register struct nfsmount *nmp = VFSTONFS(mp); 562 563 if (nmp == NULL) 564 return (EIO); 565 /* 566 * When doing an update, we can't change from or to 567 * v3 and/or nqnfs, or change cookie translation 568 */ 569 args.flags = (args.flags & 570 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 571 (nmp->nm_flag & 572 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 573 nfs_decode_args(nmp, &args); 574 return (0); 575 } 576 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 577 if (error) 578 return (error); 579 error = copyinstr(path, pth, MNAMELEN-1, &len); 580 if (error) 581 return (error); 582 memset(&pth[len], 0, MNAMELEN - len); 583 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 584 if (error) 585 return (error); 586 memset(&hst[len], 0, MNAMELEN - len); 587 /* sockargs() call must be after above copyin() calls */ 588 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 589 if (error) 590 return (error); 591 args.fh = nfh; 592 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 593 return (error); 594 } 595 596 /* 597 * Common code for mount and mountroot 598 */ 599 int 600 mountnfs(argp, mp, nam, pth, hst, vpp, p) 601 register struct nfs_args *argp; 602 register struct mount *mp; 603 struct mbuf *nam; 604 const char *pth, *hst; 605 struct vnode **vpp; 606 struct proc *p; 607 { 608 register struct nfsmount *nmp; 609 struct nfsnode *np; 610 int error; 611 struct vattr attrs; 612 struct ucred *cr; 613 614 if (mp->mnt_flag & MNT_UPDATE) { 615 nmp = VFSTONFS(mp); 616 /* update paths, file handles, etc, here XXX */ 617 m_freem(nam); 618 return (0); 619 } else { 620 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 621 M_NFSMNT, M_WAITOK); 622 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 623 mp->mnt_data = (qaddr_t)nmp; 624 TAILQ_INIT(&nmp->nm_uidlruhead); 625 TAILQ_INIT(&nmp->nm_bufq); 626 } 627 vfs_getnewfsid(mp, MOUNT_NFS); 628 nmp->nm_mountp = mp; 629 630 if (argp->flags & NFSMNT_NQNFS) 631 /* 632 * We have to set mnt_maxsymlink to a non-zero value so 633 * that COMPAT_43 routines will know that we are setting 634 * the d_type field in directories (and can zero it for 635 * unsuspecting binaries). 636 */ 637 mp->mnt_maxsymlinklen = 1; 638 639 if ((argp->flags & NFSMNT_NFSV3) == 0) 640 /* 641 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 642 * will fill this in. 643 */ 644 nmp->nm_maxfilesize = 0xffffffffLL; 645 646 nmp->nm_timeo = NFS_TIMEO; 647 nmp->nm_retry = NFS_RETRANS; 648 nmp->nm_wsize = NFS_WSIZE; 649 nmp->nm_rsize = NFS_RSIZE; 650 nmp->nm_readdirsize = NFS_READDIRSIZE; 651 nmp->nm_numgrps = NFS_MAXGRPS; 652 nmp->nm_readahead = NFS_DEFRAHEAD; 653 nmp->nm_leaseterm = NQ_DEFLEASE; 654 nmp->nm_deadthresh = NQ_DEADTHRESH; 655 CIRCLEQ_INIT(&nmp->nm_timerhead); 656 nmp->nm_inprog = NULLVP; 657 nmp->nm_fhsize = argp->fhsize; 658 memcpy((caddr_t)nmp->nm_fh, (caddr_t)argp->fh, argp->fhsize); 659 #ifdef COMPAT_09 660 mp->mnt_stat.f_type = 2; 661 #else 662 mp->mnt_stat.f_type = 0; 663 #endif 664 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, 665 MFSNAMELEN); 666 memcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN); 667 memcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN); 668 nmp->nm_nam = nam; 669 670 /* Set up the sockets and per-host congestion */ 671 nmp->nm_sotype = argp->sotype; 672 nmp->nm_soproto = argp->proto; 673 674 nfs_decode_args(nmp, argp); 675 676 /* 677 * For Connection based sockets (TCP,...) defer the connect until 678 * the first request, in case the server is not responding. 679 */ 680 if (nmp->nm_sotype == SOCK_DGRAM && 681 (error = nfs_connect(nmp, (struct nfsreq *)0))) 682 goto bad; 683 684 /* 685 * This is silly, but it has to be set so that vinifod() works. 686 * We do not want to do an nfs_statfs() here since we can get 687 * stuck on a dead server and we are holding a lock on the mount 688 * point. 689 */ 690 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 691 /* 692 * A reference count is needed on the nfsnode representing the 693 * remote root. If this object is not persistent, then backward 694 * traversals of the mount point (i.e. "..") will not work if 695 * the nfsnode gets flushed out of the cache. Ufs does not have 696 * this problem, because one can identify root inodes by their 697 * number == ROOTINO (2). 698 */ 699 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 700 if (error) 701 goto bad; 702 *vpp = NFSTOV(np); 703 VOP_GETATTR(*vpp, &attrs, p->p_ucred, p); 704 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 705 cr = crget(); 706 cr->cr_uid = attrs.va_uid; 707 cr->cr_gid = attrs.va_gid; 708 cr->cr_ngroups = 0; 709 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 710 crfree(cr); 711 } 712 713 return (0); 714 bad: 715 nfs_disconnect(nmp); 716 free((caddr_t)nmp, M_NFSMNT); 717 m_freem(nam); 718 return (error); 719 } 720 721 /* 722 * unmount system call 723 */ 724 int 725 nfs_unmount(mp, mntflags, p) 726 struct mount *mp; 727 int mntflags; 728 struct proc *p; 729 { 730 register struct nfsmount *nmp; 731 struct nfsnode *np; 732 struct vnode *vp; 733 int error, flags = 0; 734 735 if (mntflags & MNT_FORCE) 736 flags |= FORCECLOSE; 737 nmp = VFSTONFS(mp); 738 /* 739 * Goes something like this.. 740 * - Check for activity on the root vnode (other than ourselves). 741 * - Call vflush() to clear out vnodes for this file system, 742 * except for the root vnode. 743 * - Decrement reference on the vnode representing remote root. 744 * - Close the socket 745 * - Free up the data structures 746 */ 747 /* 748 * We need to decrement the ref. count on the nfsnode representing 749 * the remote root. See comment in mountnfs(). The VFS unmount() 750 * has done vput on this vnode, otherwise we would get deadlock! 751 */ 752 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 753 if (error) 754 return(error); 755 vp = NFSTOV(np); 756 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 757 vput(vp); 758 return (EBUSY); 759 } 760 761 /* 762 * Must handshake with nqnfs_clientd() if it is active. 763 */ 764 nmp->nm_iflag |= NFSMNT_DISMINPROG; 765 while (nmp->nm_inprog != NULLVP) 766 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 767 error = vflush(mp, vp, flags); 768 if (error) { 769 vput(vp); 770 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 771 return (error); 772 } 773 774 /* 775 * We are now committed to the unmount; mark the mount structure 776 * as doomed so that any sleepers kicked awake by nfs_disconnect 777 * will go away cleanly. 778 */ 779 nmp->nm_iflag |= NFSMNT_DISMNT; 780 781 /* 782 * There are two reference counts to get rid of here. 783 */ 784 vrele(vp); 785 vrele(vp); 786 vgone(vp); 787 nfs_disconnect(nmp); 788 m_freem(nmp->nm_nam); 789 790 /* 791 * For NQNFS, let the server daemon free the nfsmount structure. 792 */ 793 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 794 free((caddr_t)nmp, M_NFSMNT); 795 return (0); 796 } 797 798 /* 799 * Return root of a filesystem 800 */ 801 int 802 nfs_root(mp, vpp) 803 struct mount *mp; 804 struct vnode **vpp; 805 { 806 register struct vnode *vp; 807 struct nfsmount *nmp; 808 struct nfsnode *np; 809 int error; 810 811 nmp = VFSTONFS(mp); 812 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 813 if (error) 814 return (error); 815 vp = NFSTOV(np); 816 if (vp->v_type == VNON) 817 vp->v_type = VDIR; 818 vp->v_flag = VROOT; 819 *vpp = vp; 820 return (0); 821 } 822 823 extern int syncprt; 824 825 /* 826 * Flush out the buffer cache 827 */ 828 /* ARGSUSED */ 829 int 830 nfs_sync(mp, waitfor, cred, p) 831 struct mount *mp; 832 int waitfor; 833 struct ucred *cred; 834 struct proc *p; 835 { 836 register struct vnode *vp; 837 int error, allerror = 0; 838 839 /* 840 * Force stale buffer cache information to be flushed. 841 */ 842 loop: 843 for (vp = mp->mnt_vnodelist.lh_first; 844 vp != NULL; 845 vp = vp->v_mntvnodes.le_next) { 846 /* 847 * If the vnode that we are about to sync is no longer 848 * associated with this mount point, start over. 849 */ 850 if (vp->v_mount != mp) 851 goto loop; 852 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL || 853 waitfor == MNT_LAZY) 854 continue; 855 if (vget(vp, LK_EXCLUSIVE)) 856 goto loop; 857 error = VOP_FSYNC(vp, cred, 858 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, p); 859 if (error) 860 allerror = error; 861 vput(vp); 862 } 863 return (allerror); 864 } 865 866 /* 867 * NFS flat namespace lookup. 868 * Currently unsupported. 869 */ 870 /* ARGSUSED */ 871 int 872 nfs_vget(mp, ino, vpp) 873 struct mount *mp; 874 ino_t ino; 875 struct vnode **vpp; 876 { 877 878 return (EOPNOTSUPP); 879 } 880 881 /* 882 * Do that sysctl thang... 883 */ 884 int 885 nfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 886 int *name; 887 u_int namelen; 888 void *oldp; 889 size_t *oldlenp; 890 void *newp; 891 size_t newlen; 892 struct proc *p; 893 { 894 int rv; 895 896 /* 897 * All names at this level are terminal. 898 */ 899 if(namelen > 1) 900 return ENOTDIR; /* overloaded */ 901 902 switch(name[0]) { 903 case NFS_NFSSTATS: 904 if(!oldp) { 905 *oldlenp = sizeof nfsstats; 906 return 0; 907 } 908 909 if(*oldlenp < sizeof nfsstats) { 910 *oldlenp = sizeof nfsstats; 911 return ENOMEM; 912 } 913 914 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 915 if(rv) return rv; 916 917 if(newp && newlen != sizeof nfsstats) 918 return EINVAL; 919 920 if(newp) { 921 return copyin(newp, &nfsstats, sizeof nfsstats); 922 } 923 return 0; 924 925 default: 926 return EOPNOTSUPP; 927 } 928 } 929 930 931 /* 932 * At this point, this should never happen 933 */ 934 /* ARGSUSED */ 935 int 936 nfs_fhtovp(mp, fhp, vpp) 937 register struct mount *mp; 938 struct fid *fhp; 939 struct vnode **vpp; 940 { 941 942 return (EINVAL); 943 } 944 945 /* ARGSUSED */ 946 int 947 nfs_checkexp(mp, nam, exflagsp, credanonp) 948 register struct mount *mp; 949 struct mbuf *nam; 950 int *exflagsp; 951 struct ucred **credanonp; 952 { 953 954 return (EINVAL); 955 } 956 957 /* 958 * Vnode pointer to File handle, should never happen either 959 */ 960 /* ARGSUSED */ 961 int 962 nfs_vptofh(vp, fhp) 963 struct vnode *vp; 964 struct fid *fhp; 965 { 966 967 return (EINVAL); 968 } 969 970 /* 971 * Vfs start routine, a no-op. 972 */ 973 /* ARGSUSED */ 974 int 975 nfs_start(mp, flags, p) 976 struct mount *mp; 977 int flags; 978 struct proc *p; 979 { 980 981 return (0); 982 } 983 984 /* 985 * Do operations associated with quotas, not supported 986 */ 987 /* ARGSUSED */ 988 int 989 nfs_quotactl(mp, cmd, uid, arg, p) 990 struct mount *mp; 991 int cmd; 992 uid_t uid; 993 caddr_t arg; 994 struct proc *p; 995 { 996 997 return (EOPNOTSUPP); 998 } 999